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::getenv(const char* name, char* buffer, int len) {
157 int result = GetEnvironmentVariable(name, buffer, len);
158 return result > 0 && result < len;
159 }
160
161 bool os::unsetenv(const char* name) {
162 assert(name != NULL, "Null pointer");
163 return (SetEnvironmentVariable(name, NULL) == TRUE);
164 }
165
166 // No setuid programs under Windows.
167 bool os::have_special_privileges() {
168 return false;
169 }
170
171
172 // This method is a periodic task to check for misbehaving JNI applications
173 // under CheckJNI, we can add any periodic checks here.
174 // For Windows at the moment does nothing
175 void os::run_periodic_checks() {
176 return;
177 }
178
179 // previous UnhandledExceptionFilter, if there is one
180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181
182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
183
184 void os::init_system_properties_values() {
185 // sysclasspath, java_home, dll_dir
186 {
187 char *home_path;
188 char *dll_path;
189 char *pslash;
190 char *bin = "\\bin";
191 char home_dir[MAX_PATH];
192
193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
194 os::jvm_path(home_dir, sizeof(home_dir));
195 // Found the full path to jvm.dll.
196 // Now cut the path to <java_home>/jre if we can.
197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
198 pslash = strrchr(home_dir, '\\');
199 if (pslash != NULL) {
200 *pslash = '\0'; // get rid of \{client|server}
201 pslash = strrchr(home_dir, '\\');
202 if (pslash != NULL) {
203 *pslash = '\0'; // get rid of \bin
204 }
205 }
206 }
207
208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
209 if (home_path == NULL) {
210 return;
211 }
212 strcpy(home_path, home_dir);
213 Arguments::set_java_home(home_path);
214 FREE_C_HEAP_ARRAY(char, home_path);
215
216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
217 mtInternal);
218 if (dll_path == NULL) {
219 return;
220 }
221 strcpy(dll_path, home_dir);
222 strcat(dll_path, bin);
223 Arguments::set_dll_dir(dll_path);
224 FREE_C_HEAP_ARRAY(char, dll_path);
225
226 if (!set_boot_path('\\', ';')) {
227 return;
228 }
229 }
230
231 // library_path
232 #define EXT_DIR "\\lib\\ext"
233 #define BIN_DIR "\\bin"
234 #define PACKAGE_DIR "\\Sun\\Java"
235 {
236 // Win32 library search order (See the documentation for LoadLibrary):
237 //
238 // 1. The directory from which application is loaded.
239 // 2. The system wide Java Extensions directory (Java only)
240 // 3. System directory (GetSystemDirectory)
241 // 4. Windows directory (GetWindowsDirectory)
242 // 5. The PATH environment variable
243 // 6. The current directory
244
245 char *library_path;
246 char tmp[MAX_PATH];
247 char *path_str = ::getenv("PATH");
248
249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
251
252 library_path[0] = '\0';
253
254 GetModuleFileName(NULL, tmp, sizeof(tmp));
255 *(strrchr(tmp, '\\')) = '\0';
256 strcat(library_path, tmp);
257
258 GetWindowsDirectory(tmp, sizeof(tmp));
259 strcat(library_path, ";");
260 strcat(library_path, tmp);
261 strcat(library_path, PACKAGE_DIR BIN_DIR);
262
263 GetSystemDirectory(tmp, sizeof(tmp));
264 strcat(library_path, ";");
265 strcat(library_path, tmp);
266
267 GetWindowsDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
270
271 if (path_str) {
272 strcat(library_path, ";");
273 strcat(library_path, path_str);
274 }
275
276 strcat(library_path, ";.");
277
278 Arguments::set_library_path(library_path);
279 FREE_C_HEAP_ARRAY(char, library_path);
280 }
281
282 // Default extensions directory
283 {
284 char path[MAX_PATH];
285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
286 GetWindowsDirectory(path, MAX_PATH);
287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
288 path, PACKAGE_DIR, EXT_DIR);
289 Arguments::set_ext_dirs(buf);
290 }
291 #undef EXT_DIR
292 #undef BIN_DIR
293 #undef PACKAGE_DIR
294
295 #ifndef _WIN64
296 // set our UnhandledExceptionFilter and save any previous one
297 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
298 #endif
299
300 // Done
301 return;
302 }
303
304 void os::breakpoint() {
305 DebugBreak();
306 }
307
308 // Invoked from the BREAKPOINT Macro
309 extern "C" void breakpoint() {
310 os::breakpoint();
311 }
312
313 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
314 // So far, this method is only used by Native Memory Tracking, which is
315 // only supported on Windows XP or later.
316 //
317 int os::get_native_stack(address* stack, int frames, int toSkip) {
318 #ifdef _NMT_NOINLINE_
319 toSkip++;
320 #endif
321 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
322 (PVOID*)stack, NULL);
323 for (int index = captured; index < frames; index ++) {
324 stack[index] = NULL;
325 }
326 return captured;
327 }
328
329
330 // os::current_stack_base()
331 //
332 // Returns the base of the stack, which is the stack's
333 // starting address. This function must be called
334 // while running on the stack of the thread being queried.
335
336 address os::current_stack_base() {
337 MEMORY_BASIC_INFORMATION minfo;
338 address stack_bottom;
339 size_t stack_size;
340
341 VirtualQuery(&minfo, &minfo, sizeof(minfo));
342 stack_bottom = (address)minfo.AllocationBase;
343 stack_size = minfo.RegionSize;
344
345 // Add up the sizes of all the regions with the same
346 // AllocationBase.
347 while (1) {
348 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
349 if (stack_bottom == (address)minfo.AllocationBase) {
350 stack_size += minfo.RegionSize;
351 } else {
352 break;
353 }
354 }
355
356 #ifdef _M_IA64
357 // IA64 has memory and register stacks
358 //
359 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
360 // at thread creation (1MB backing store growing upwards, 1MB memory stack
361 // growing downwards, 2MB summed up)
362 //
363 // ...
364 // ------- top of stack (high address) -----
365 // |
366 // | 1MB
367 // | Backing Store (Register Stack)
368 // |
369 // | / \
370 // | |
371 // | |
372 // | |
373 // ------------------------ stack base -----
374 // | 1MB
375 // | Memory Stack
376 // |
377 // | |
378 // | |
379 // | |
380 // | \ /
381 // |
382 // ----- bottom of stack (low address) -----
383 // ...
384
385 stack_size = stack_size / 2;
386 #endif
387 return stack_bottom + stack_size;
388 }
389
390 size_t os::current_stack_size() {
391 size_t sz;
392 MEMORY_BASIC_INFORMATION minfo;
393 VirtualQuery(&minfo, &minfo, sizeof(minfo));
394 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
395 return sz;
396 }
397
398 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
399 const struct tm* time_struct_ptr = localtime(clock);
400 if (time_struct_ptr != NULL) {
401 *res = *time_struct_ptr;
402 return res;
403 }
404 return NULL;
405 }
406
407 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
408
409 // Thread start routine for all new Java threads
410 static unsigned __stdcall java_start(Thread* thread) {
411 // Try to randomize the cache line index of hot stack frames.
412 // This helps when threads of the same stack traces evict each other's
413 // cache lines. The threads can be either from the same JVM instance, or
414 // from different JVM instances. The benefit is especially true for
415 // processors with hyperthreading technology.
416 static int counter = 0;
417 int pid = os::current_process_id();
418 _alloca(((pid ^ counter++) & 7) * 128);
419
420 OSThread* osthr = thread->osthread();
421 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
422
423 if (UseNUMA) {
424 int lgrp_id = os::numa_get_group_id();
425 if (lgrp_id != -1) {
426 thread->set_lgrp_id(lgrp_id);
427 }
428 }
429
430 // Diagnostic code to investigate JDK-6573254
431 int res = 30115; // non-java thread
432 if (thread->is_Java_thread()) {
433 res = 20115; // java thread
434 }
435
436 // Install a win32 structured exception handler around every thread created
437 // by VM, so VM can generate error dump when an exception occurred in non-
438 // Java thread (e.g. VM thread).
439 __try {
440 thread->run();
441 } __except(topLevelExceptionFilter(
442 (_EXCEPTION_POINTERS*)_exception_info())) {
443 // Nothing to do.
444 }
445
446 // One less thread is executing
447 // When the VMThread gets here, the main thread may have already exited
448 // which frees the CodeHeap containing the Atomic::add code
449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
451 }
452
453 // Thread must not return from exit_process_or_thread(), but if it does,
454 // let it proceed to exit normally
455 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
456 }
457
458 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
459 int thread_id) {
460 // Allocate the OSThread object
461 OSThread* osthread = new OSThread(NULL, NULL);
462 if (osthread == NULL) return NULL;
463
464 // Initialize support for Java interrupts
465 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
466 if (interrupt_event == NULL) {
467 delete osthread;
468 return NULL;
469 }
470 osthread->set_interrupt_event(interrupt_event);
471
472 // Store info on the Win32 thread into the OSThread
473 osthread->set_thread_handle(thread_handle);
474 osthread->set_thread_id(thread_id);
475
476 if (UseNUMA) {
477 int lgrp_id = os::numa_get_group_id();
478 if (lgrp_id != -1) {
479 thread->set_lgrp_id(lgrp_id);
480 }
481 }
482
483 // Initial thread state is INITIALIZED, not SUSPENDED
484 osthread->set_state(INITIALIZED);
485
486 return osthread;
487 }
488
489
490 bool os::create_attached_thread(JavaThread* thread) {
491 #ifdef ASSERT
492 thread->verify_not_published();
493 #endif
494 HANDLE thread_h;
495 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
496 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
497 fatal("DuplicateHandle failed\n");
498 }
499 OSThread* osthread = create_os_thread(thread, thread_h,
500 (int)current_thread_id());
501 if (osthread == NULL) {
502 return false;
503 }
504
505 // Initial thread state is RUNNABLE
506 osthread->set_state(RUNNABLE);
507
508 thread->set_osthread(osthread);
509 return true;
510 }
511
512 bool os::create_main_thread(JavaThread* thread) {
513 #ifdef ASSERT
514 thread->verify_not_published();
515 #endif
516 if (_starting_thread == NULL) {
517 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
518 if (_starting_thread == NULL) {
519 return false;
520 }
521 }
522
523 // The primordial thread is runnable from the start)
524 _starting_thread->set_state(RUNNABLE);
525
526 thread->set_osthread(_starting_thread);
527 return true;
528 }
529
530 // Allocate and initialize a new OSThread
531 bool os::create_thread(Thread* thread, ThreadType thr_type,
532 size_t stack_size) {
533 unsigned thread_id;
534
535 // Allocate the OSThread object
536 OSThread* osthread = new OSThread(NULL, NULL);
537 if (osthread == NULL) {
538 return false;
539 }
540
541 // Initialize support for Java interrupts
542 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
543 if (interrupt_event == NULL) {
544 delete osthread;
545 return NULL;
546 }
547 osthread->set_interrupt_event(interrupt_event);
548 osthread->set_interrupted(false);
549
550 thread->set_osthread(osthread);
551
552 if (stack_size == 0) {
553 switch (thr_type) {
554 case os::java_thread:
555 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
556 if (JavaThread::stack_size_at_create() > 0) {
557 stack_size = JavaThread::stack_size_at_create();
558 }
559 break;
560 case os::compiler_thread:
561 if (CompilerThreadStackSize > 0) {
562 stack_size = (size_t)(CompilerThreadStackSize * K);
563 break;
564 } // else fall through:
565 // use VMThreadStackSize if CompilerThreadStackSize is not defined
566 case os::vm_thread:
567 case os::pgc_thread:
568 case os::cgc_thread:
569 case os::watcher_thread:
570 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
571 break;
572 }
573 }
574
575 // Create the Win32 thread
576 //
577 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
578 // does not specify stack size. Instead, it specifies the size of
579 // initially committed space. The stack size is determined by
580 // PE header in the executable. If the committed "stack_size" is larger
581 // than default value in the PE header, the stack is rounded up to the
582 // nearest multiple of 1MB. For example if the launcher has default
583 // stack size of 320k, specifying any size less than 320k does not
584 // affect the actual stack size at all, it only affects the initial
585 // commitment. On the other hand, specifying 'stack_size' larger than
586 // default value may cause significant increase in memory usage, because
587 // not only the stack space will be rounded up to MB, but also the
588 // entire space is committed upfront.
589 //
590 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
591 // for CreateThread() that can treat 'stack_size' as stack size. However we
592 // are not supposed to call CreateThread() directly according to MSDN
593 // document because JVM uses C runtime library. The good news is that the
594 // flag appears to work with _beginthredex() as well.
595
596 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
597 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
598 #endif
599
600 HANDLE thread_handle =
601 (HANDLE)_beginthreadex(NULL,
602 (unsigned)stack_size,
603 (unsigned (__stdcall *)(void*)) java_start,
604 thread,
605 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
606 &thread_id);
607 if (thread_handle == NULL) {
608 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
609 // without the flag.
610 thread_handle =
611 (HANDLE)_beginthreadex(NULL,
612 (unsigned)stack_size,
613 (unsigned (__stdcall *)(void*)) java_start,
614 thread,
615 CREATE_SUSPENDED,
616 &thread_id);
617 }
618 if (thread_handle == NULL) {
619 // Need to clean up stuff we've allocated so far
620 CloseHandle(osthread->interrupt_event());
621 thread->set_osthread(NULL);
622 delete osthread;
623 return NULL;
624 }
625
626 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
627
628 // Store info on the Win32 thread into the OSThread
629 osthread->set_thread_handle(thread_handle);
630 osthread->set_thread_id(thread_id);
631
632 // Initial thread state is INITIALIZED, not SUSPENDED
633 osthread->set_state(INITIALIZED);
634
635 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
636 return true;
637 }
638
639
640 // Free Win32 resources related to the OSThread
641 void os::free_thread(OSThread* osthread) {
642 assert(osthread != NULL, "osthread not set");
643 CloseHandle(osthread->thread_handle());
644 CloseHandle(osthread->interrupt_event());
645 delete osthread;
646 }
647
648 static jlong first_filetime;
649 static jlong initial_performance_count;
650 static jlong performance_frequency;
651
652
653 jlong as_long(LARGE_INTEGER x) {
654 jlong result = 0; // initialization to avoid warning
655 set_high(&result, x.HighPart);
656 set_low(&result, x.LowPart);
657 return result;
658 }
659
660
661 jlong os::elapsed_counter() {
662 LARGE_INTEGER count;
663 if (win32::_has_performance_count) {
664 QueryPerformanceCounter(&count);
665 return as_long(count) - initial_performance_count;
666 } else {
667 FILETIME wt;
668 GetSystemTimeAsFileTime(&wt);
669 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
670 }
671 }
672
673
674 jlong os::elapsed_frequency() {
675 if (win32::_has_performance_count) {
676 return performance_frequency;
677 } else {
678 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
679 return 10000000;
680 }
681 }
682
683
684 julong os::available_memory() {
685 return win32::available_memory();
686 }
687
688 julong os::win32::available_memory() {
689 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
690 // value if total memory is larger than 4GB
691 MEMORYSTATUSEX ms;
692 ms.dwLength = sizeof(ms);
693 GlobalMemoryStatusEx(&ms);
694
695 return (julong)ms.ullAvailPhys;
696 }
697
698 julong os::physical_memory() {
699 return win32::physical_memory();
700 }
701
702 bool os::has_allocatable_memory_limit(julong* limit) {
703 MEMORYSTATUSEX ms;
704 ms.dwLength = sizeof(ms);
705 GlobalMemoryStatusEx(&ms);
706 #ifdef _LP64
707 *limit = (julong)ms.ullAvailVirtual;
708 return true;
709 #else
710 // Limit to 1400m because of the 2gb address space wall
711 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
712 return true;
713 #endif
714 }
715
716 // VC6 lacks DWORD_PTR
717 #if _MSC_VER < 1300
718 typedef UINT_PTR DWORD_PTR;
719 #endif
720
721 int os::active_processor_count() {
722 DWORD_PTR lpProcessAffinityMask = 0;
723 DWORD_PTR lpSystemAffinityMask = 0;
724 int proc_count = processor_count();
725 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
726 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
727 // Nof active processors is number of bits in process affinity mask
728 int bitcount = 0;
729 while (lpProcessAffinityMask != 0) {
730 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
731 bitcount++;
732 }
733 return bitcount;
734 } else {
735 return proc_count;
736 }
737 }
738
739 void os::set_native_thread_name(const char *name) {
740
741 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
742 //
743 // Note that unfortunately this only works if the process
744 // is already attached to a debugger; debugger must observe
745 // the exception below to show the correct name.
746
747 const DWORD MS_VC_EXCEPTION = 0x406D1388;
748 struct {
749 DWORD dwType; // must be 0x1000
750 LPCSTR szName; // pointer to name (in user addr space)
751 DWORD dwThreadID; // thread ID (-1=caller thread)
752 DWORD dwFlags; // reserved for future use, must be zero
753 } info;
754
755 info.dwType = 0x1000;
756 info.szName = name;
757 info.dwThreadID = -1;
758 info.dwFlags = 0;
759
760 __try {
761 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
762 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
763 }
764
765 bool os::distribute_processes(uint length, uint* distribution) {
766 // Not yet implemented.
767 return false;
768 }
769
770 bool os::bind_to_processor(uint processor_id) {
771 // Not yet implemented.
772 return false;
773 }
774
775 void os::win32::initialize_performance_counter() {
776 LARGE_INTEGER count;
777 if (QueryPerformanceFrequency(&count)) {
778 win32::_has_performance_count = 1;
779 performance_frequency = as_long(count);
780 QueryPerformanceCounter(&count);
781 initial_performance_count = as_long(count);
782 } else {
783 win32::_has_performance_count = 0;
784 FILETIME wt;
785 GetSystemTimeAsFileTime(&wt);
786 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
787 }
788 }
789
790
791 double os::elapsedTime() {
792 return (double) elapsed_counter() / (double) elapsed_frequency();
793 }
794
795
796 // Windows format:
797 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
798 // Java format:
799 // Java standards require the number of milliseconds since 1/1/1970
800
801 // Constant offset - calculated using offset()
802 static jlong _offset = 116444736000000000;
803 // Fake time counter for reproducible results when debugging
804 static jlong fake_time = 0;
805
806 #ifdef ASSERT
807 // Just to be safe, recalculate the offset in debug mode
808 static jlong _calculated_offset = 0;
809 static int _has_calculated_offset = 0;
810
811 jlong offset() {
812 if (_has_calculated_offset) return _calculated_offset;
813 SYSTEMTIME java_origin;
814 java_origin.wYear = 1970;
815 java_origin.wMonth = 1;
816 java_origin.wDayOfWeek = 0; // ignored
817 java_origin.wDay = 1;
818 java_origin.wHour = 0;
819 java_origin.wMinute = 0;
820 java_origin.wSecond = 0;
821 java_origin.wMilliseconds = 0;
822 FILETIME jot;
823 if (!SystemTimeToFileTime(&java_origin, &jot)) {
824 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
825 }
826 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
827 _has_calculated_offset = 1;
828 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
829 return _calculated_offset;
830 }
831 #else
832 jlong offset() {
833 return _offset;
834 }
835 #endif
836
837 jlong windows_to_java_time(FILETIME wt) {
838 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
839 return (a - offset()) / 10000;
840 }
841
842 // Returns time ticks in (10th of micro seconds)
843 jlong windows_to_time_ticks(FILETIME wt) {
844 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
845 return (a - offset());
846 }
847
848 FILETIME java_to_windows_time(jlong l) {
849 jlong a = (l * 10000) + offset();
850 FILETIME result;
851 result.dwHighDateTime = high(a);
852 result.dwLowDateTime = low(a);
853 return result;
854 }
855
856 bool os::supports_vtime() { return true; }
857 bool os::enable_vtime() { return false; }
858 bool os::vtime_enabled() { return false; }
859
860 double os::elapsedVTime() {
861 FILETIME created;
862 FILETIME exited;
863 FILETIME kernel;
864 FILETIME user;
865 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
866 // the resolution of windows_to_java_time() should be sufficient (ms)
867 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
868 } else {
869 return elapsedTime();
870 }
871 }
872
873 jlong os::javaTimeMillis() {
874 if (UseFakeTimers) {
875 return fake_time++;
876 } else {
877 FILETIME wt;
878 GetSystemTimeAsFileTime(&wt);
879 return windows_to_java_time(wt);
880 }
881 }
882
883 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
884 FILETIME wt;
885 GetSystemTimeAsFileTime(&wt);
886 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
887 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
888 seconds = secs;
889 nanos = jlong(ticks - (secs*10000000)) * 100;
890 }
891
892 jlong os::javaTimeNanos() {
893 if (!win32::_has_performance_count) {
894 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
895 } else {
896 LARGE_INTEGER current_count;
897 QueryPerformanceCounter(¤t_count);
898 double current = as_long(current_count);
899 double freq = performance_frequency;
900 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
901 return time;
902 }
903 }
904
905 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
906 if (!win32::_has_performance_count) {
907 // javaTimeMillis() doesn't have much percision,
908 // but it is not going to wrap -- so all 64 bits
909 info_ptr->max_value = ALL_64_BITS;
910
911 // this is a wall clock timer, so may skip
912 info_ptr->may_skip_backward = true;
913 info_ptr->may_skip_forward = true;
914 } else {
915 jlong freq = performance_frequency;
916 if (freq < NANOSECS_PER_SEC) {
917 // the performance counter is 64 bits and we will
918 // be multiplying it -- so no wrap in 64 bits
919 info_ptr->max_value = ALL_64_BITS;
920 } else if (freq > NANOSECS_PER_SEC) {
921 // use the max value the counter can reach to
922 // determine the max value which could be returned
923 julong max_counter = (julong)ALL_64_BITS;
924 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
925 } else {
926 // the performance counter is 64 bits and we will
927 // be using it directly -- so no wrap in 64 bits
928 info_ptr->max_value = ALL_64_BITS;
929 }
930
931 // using a counter, so no skipping
932 info_ptr->may_skip_backward = false;
933 info_ptr->may_skip_forward = false;
934 }
935 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
936 }
937
938 char* os::local_time_string(char *buf, size_t buflen) {
939 SYSTEMTIME st;
940 GetLocalTime(&st);
941 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
942 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
943 return buf;
944 }
945
946 bool os::getTimesSecs(double* process_real_time,
947 double* process_user_time,
948 double* process_system_time) {
949 HANDLE h_process = GetCurrentProcess();
950 FILETIME create_time, exit_time, kernel_time, user_time;
951 BOOL result = GetProcessTimes(h_process,
952 &create_time,
953 &exit_time,
954 &kernel_time,
955 &user_time);
956 if (result != 0) {
957 FILETIME wt;
958 GetSystemTimeAsFileTime(&wt);
959 jlong rtc_millis = windows_to_java_time(wt);
960 jlong user_millis = windows_to_java_time(user_time);
961 jlong system_millis = windows_to_java_time(kernel_time);
962 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
963 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
964 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
965 return true;
966 } else {
967 return false;
968 }
969 }
970
971 void os::shutdown() {
972 // allow PerfMemory to attempt cleanup of any persistent resources
973 perfMemory_exit();
974
975 // flush buffered output, finish log files
976 ostream_abort();
977
978 // Check for abort hook
979 abort_hook_t abort_hook = Arguments::abort_hook();
980 if (abort_hook != NULL) {
981 abort_hook();
982 }
983 }
984
985 typedef BOOL (WINAPI *fun_MiniDumpWriteDump_t) (HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
986 PMINIDUMP_EXCEPTION_INFORMATION,
987 PMINIDUMP_USER_STREAM_INFORMATION,
988 PMINIDUMP_CALLBACK_INFORMATION);
989 typedef LPAPI_VERSION (WINAPI *fun_ImagehlpApiVersion_t) (VOID);
990
991 static fun_MiniDumpWriteDump_t _MiniDumpWriteDump;
992 static fun_ImagehlpApiVersion_t _ImagehlpApiVersion;
993
994 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
995 HINSTANCE dbghelp;
996 EXCEPTION_POINTERS ep;
997 MINIDUMP_EXCEPTION_INFORMATION mei;
998 MINIDUMP_EXCEPTION_INFORMATION* pmei;
999
1000 HANDLE hProcess = GetCurrentProcess();
1001 DWORD processId = GetCurrentProcessId();
1002 HANDLE dumpFile;
1003 MINIDUMP_TYPE dumpType;
1004 static const char* cwd;
1005
1006 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
1007 #ifndef ASSERT
1008 // If running on a client version of Windows and user has not explicitly enabled dumping
1009 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
1010 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
1011 return;
1012 // If running on a server version of Windows and user has explictly disabled dumping
1013 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1014 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1015 return;
1016 }
1017 #else
1018 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1019 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1020 return;
1021 }
1022 #endif
1023
1024 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1025
1026 if (dbghelp == NULL) {
1027 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1028 return;
1029 }
1030
1031 if (_MiniDumpWriteDump == NULL) {
1032 _MiniDumpWriteDump =
1033 CAST_TO_FN_PTR(fun_MiniDumpWriteDump_t, GetProcAddress(dbghelp, "MiniDumpWriteDump"));
1034 _ImagehlpApiVersion =
1035 CAST_TO_FN_PTR(fun_ImagehlpApiVersion_t, GetProcAddress(dbghelp, "ImagehlpApiVersion"));
1036 if (_MiniDumpWriteDump == NULL || _ImagehlpApiVersion == NULL) {
1037 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() or ImagehlpApiVersion() "
1038 "in module dbghelp.dll", false);
1039 return;
1040 }
1041 }
1042
1043 const API_VERSION* const version = _ImagehlpApiVersion();
1044
1045 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1046
1047 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1048 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1049 if (version->MajorVersion >= 11) {
1050 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1051 MiniDumpWithUnloadedModules);
1052 }
1053
1054 cwd = get_current_directory(NULL, 0);
1055 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1056 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1057
1058 if (dumpFile == INVALID_HANDLE_VALUE) {
1059 VMError::report_coredump_status("Failed to create file for dumping", false);
1060 return;
1061 }
1062 if (exceptionRecord != NULL && contextRecord != NULL) {
1063 ep.ContextRecord = (PCONTEXT) contextRecord;
1064 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1065
1066 mei.ThreadId = GetCurrentThreadId();
1067 mei.ExceptionPointers = &ep;
1068 pmei = &mei;
1069 } else {
1070 pmei = NULL;
1071 }
1072
1073
1074 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1075 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1076 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1077 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1078 DWORD error = GetLastError();
1079 LPTSTR msgbuf = NULL;
1080
1081 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1082 FORMAT_MESSAGE_FROM_SYSTEM |
1083 FORMAT_MESSAGE_IGNORE_INSERTS,
1084 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1085
1086 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1087 LocalFree(msgbuf);
1088 } else {
1089 // Call to FormatMessage failed, just include the result from GetLastError
1090 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1091 }
1092 VMError::report_coredump_status(buffer, false);
1093 } else {
1094 VMError::report_coredump_status(buffer, true);
1095 }
1096
1097 CloseHandle(dumpFile);
1098 }
1099
1100
1101 void os::abort(bool dump_core) {
1102 os::shutdown();
1103 // no core dump on Windows
1104 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1105 }
1106
1107 // Die immediately, no exit hook, no abort hook, no cleanup.
1108 void os::die() {
1109 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1110 }
1111
1112 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1113 // * dirent_md.c 1.15 00/02/02
1114 //
1115 // The declarations for DIR and struct dirent are in jvm_win32.h.
1116
1117 // Caller must have already run dirname through JVM_NativePath, which removes
1118 // duplicate slashes and converts all instances of '/' into '\\'.
1119
1120 DIR * os::opendir(const char *dirname) {
1121 assert(dirname != NULL, "just checking"); // hotspot change
1122 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1123 DWORD fattr; // hotspot change
1124 char alt_dirname[4] = { 0, 0, 0, 0 };
1125
1126 if (dirp == 0) {
1127 errno = ENOMEM;
1128 return 0;
1129 }
1130
1131 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1132 // as a directory in FindFirstFile(). We detect this case here and
1133 // prepend the current drive name.
1134 //
1135 if (dirname[1] == '\0' && dirname[0] == '\\') {
1136 alt_dirname[0] = _getdrive() + 'A' - 1;
1137 alt_dirname[1] = ':';
1138 alt_dirname[2] = '\\';
1139 alt_dirname[3] = '\0';
1140 dirname = alt_dirname;
1141 }
1142
1143 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1144 if (dirp->path == 0) {
1145 free(dirp);
1146 errno = ENOMEM;
1147 return 0;
1148 }
1149 strcpy(dirp->path, dirname);
1150
1151 fattr = GetFileAttributes(dirp->path);
1152 if (fattr == 0xffffffff) {
1153 free(dirp->path);
1154 free(dirp);
1155 errno = ENOENT;
1156 return 0;
1157 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1158 free(dirp->path);
1159 free(dirp);
1160 errno = ENOTDIR;
1161 return 0;
1162 }
1163
1164 // Append "*.*", or possibly "\\*.*", to path
1165 if (dirp->path[1] == ':' &&
1166 (dirp->path[2] == '\0' ||
1167 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1168 // No '\\' needed for cases like "Z:" or "Z:\"
1169 strcat(dirp->path, "*.*");
1170 } else {
1171 strcat(dirp->path, "\\*.*");
1172 }
1173
1174 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1175 if (dirp->handle == INVALID_HANDLE_VALUE) {
1176 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1177 free(dirp->path);
1178 free(dirp);
1179 errno = EACCES;
1180 return 0;
1181 }
1182 }
1183 return dirp;
1184 }
1185
1186 // parameter dbuf unused on Windows
1187 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1188 assert(dirp != NULL, "just checking"); // hotspot change
1189 if (dirp->handle == INVALID_HANDLE_VALUE) {
1190 return 0;
1191 }
1192
1193 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1194
1195 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1196 if (GetLastError() == ERROR_INVALID_HANDLE) {
1197 errno = EBADF;
1198 return 0;
1199 }
1200 FindClose(dirp->handle);
1201 dirp->handle = INVALID_HANDLE_VALUE;
1202 }
1203
1204 return &dirp->dirent;
1205 }
1206
1207 int os::closedir(DIR *dirp) {
1208 assert(dirp != NULL, "just checking"); // hotspot change
1209 if (dirp->handle != INVALID_HANDLE_VALUE) {
1210 if (!FindClose(dirp->handle)) {
1211 errno = EBADF;
1212 return -1;
1213 }
1214 dirp->handle = INVALID_HANDLE_VALUE;
1215 }
1216 free(dirp->path);
1217 free(dirp);
1218 return 0;
1219 }
1220
1221 // This must be hard coded because it's the system's temporary
1222 // directory not the java application's temp directory, ala java.io.tmpdir.
1223 const char* os::get_temp_directory() {
1224 static char path_buf[MAX_PATH];
1225 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1226 return path_buf;
1227 } else {
1228 path_buf[0] = '\0';
1229 return path_buf;
1230 }
1231 }
1232
1233 static bool file_exists(const char* filename) {
1234 if (filename == NULL || strlen(filename) == 0) {
1235 return false;
1236 }
1237 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1238 }
1239
1240 bool os::dll_build_name(char *buffer, size_t buflen,
1241 const char* pname, const char* fname) {
1242 bool retval = false;
1243 const size_t pnamelen = pname ? strlen(pname) : 0;
1244 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1245
1246 // Return error on buffer overflow.
1247 if (pnamelen + strlen(fname) + 10 > buflen) {
1248 return retval;
1249 }
1250
1251 if (pnamelen == 0) {
1252 jio_snprintf(buffer, buflen, "%s.dll", fname);
1253 retval = true;
1254 } else if (c == ':' || c == '\\') {
1255 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1256 retval = true;
1257 } else if (strchr(pname, *os::path_separator()) != NULL) {
1258 int n;
1259 char** pelements = split_path(pname, &n);
1260 if (pelements == NULL) {
1261 return false;
1262 }
1263 for (int i = 0; i < n; i++) {
1264 char* path = pelements[i];
1265 // Really shouldn't be NULL, but check can't hurt
1266 size_t plen = (path == NULL) ? 0 : strlen(path);
1267 if (plen == 0) {
1268 continue; // skip the empty path values
1269 }
1270 const char lastchar = path[plen - 1];
1271 if (lastchar == ':' || lastchar == '\\') {
1272 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1273 } else {
1274 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1275 }
1276 if (file_exists(buffer)) {
1277 retval = true;
1278 break;
1279 }
1280 }
1281 // release the storage
1282 for (int i = 0; i < n; i++) {
1283 if (pelements[i] != NULL) {
1284 FREE_C_HEAP_ARRAY(char, pelements[i]);
1285 }
1286 }
1287 if (pelements != NULL) {
1288 FREE_C_HEAP_ARRAY(char*, pelements);
1289 }
1290 } else {
1291 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1292 retval = true;
1293 }
1294 return retval;
1295 }
1296
1297 // Needs to be in os specific directory because windows requires another
1298 // header file <direct.h>
1299 const char* os::get_current_directory(char *buf, size_t buflen) {
1300 int n = static_cast<int>(buflen);
1301 if (buflen > INT_MAX) n = INT_MAX;
1302 return _getcwd(buf, n);
1303 }
1304
1305 //-----------------------------------------------------------
1306 // Helper functions for fatal error handler
1307 #ifdef _WIN64
1308 // Helper routine which returns true if address in
1309 // within the NTDLL address space.
1310 //
1311 static bool _addr_in_ntdll(address addr) {
1312 HMODULE hmod;
1313 MODULEINFO minfo;
1314
1315 hmod = GetModuleHandle("NTDLL.DLL");
1316 if (hmod == NULL) return false;
1317 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1318 &minfo, sizeof(MODULEINFO))) {
1319 return false;
1320 }
1321
1322 if ((addr >= minfo.lpBaseOfDll) &&
1323 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1324 return true;
1325 } else {
1326 return false;
1327 }
1328 }
1329 #endif
1330
1331 struct _modinfo {
1332 address addr;
1333 char* full_path; // point to a char buffer
1334 int buflen; // size of the buffer
1335 address base_addr;
1336 };
1337
1338 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1339 address top_address, void * param) {
1340 struct _modinfo *pmod = (struct _modinfo *)param;
1341 if (!pmod) return -1;
1342
1343 if (base_addr <= pmod->addr &&
1344 top_address > pmod->addr) {
1345 // if a buffer is provided, copy path name to the buffer
1346 if (pmod->full_path) {
1347 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1348 }
1349 pmod->base_addr = base_addr;
1350 return 1;
1351 }
1352 return 0;
1353 }
1354
1355 bool os::dll_address_to_library_name(address addr, char* buf,
1356 int buflen, int* offset) {
1357 // buf is not optional, but offset is optional
1358 assert(buf != NULL, "sanity check");
1359
1360 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1361 // return the full path to the DLL file, sometimes it returns path
1362 // to the corresponding PDB file (debug info); sometimes it only
1363 // returns partial path, which makes life painful.
1364
1365 struct _modinfo mi;
1366 mi.addr = addr;
1367 mi.full_path = buf;
1368 mi.buflen = buflen;
1369 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1370 // buf already contains path name
1371 if (offset) *offset = addr - mi.base_addr;
1372 return true;
1373 }
1374
1375 buf[0] = '\0';
1376 if (offset) *offset = -1;
1377 return false;
1378 }
1379
1380 bool os::dll_address_to_function_name(address addr, char *buf,
1381 int buflen, int *offset) {
1382 // buf is not optional, but offset is optional
1383 assert(buf != NULL, "sanity check");
1384
1385 if (Decoder::decode(addr, buf, buflen, offset)) {
1386 return true;
1387 }
1388 if (offset != NULL) *offset = -1;
1389 buf[0] = '\0';
1390 return false;
1391 }
1392
1393 // save the start and end address of jvm.dll into param[0] and param[1]
1394 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1395 address top_address, void * param) {
1396 if (!param) return -1;
1397
1398 if (base_addr <= (address)_locate_jvm_dll &&
1399 top_address > (address)_locate_jvm_dll) {
1400 ((address*)param)[0] = base_addr;
1401 ((address*)param)[1] = top_address;
1402 return 1;
1403 }
1404 return 0;
1405 }
1406
1407 address vm_lib_location[2]; // start and end address of jvm.dll
1408
1409 // check if addr is inside jvm.dll
1410 bool os::address_is_in_vm(address addr) {
1411 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1412 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1413 assert(false, "Can't find jvm module.");
1414 return false;
1415 }
1416 }
1417
1418 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1419 }
1420
1421 // print module info; param is outputStream*
1422 static int _print_module(const char* fname, address base_address,
1423 address top_address, void* param) {
1424 if (!param) return -1;
1425
1426 outputStream* st = (outputStream*)param;
1427
1428 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1429 return 0;
1430 }
1431
1432 // Loads .dll/.so and
1433 // in case of error it checks if .dll/.so was built for the
1434 // same architecture as Hotspot is running on
1435 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1436 void * result = LoadLibrary(name);
1437 if (result != NULL) {
1438 return result;
1439 }
1440
1441 DWORD errcode = GetLastError();
1442 if (errcode == ERROR_MOD_NOT_FOUND) {
1443 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1444 ebuf[ebuflen - 1] = '\0';
1445 return NULL;
1446 }
1447
1448 // Parsing dll below
1449 // If we can read dll-info and find that dll was built
1450 // for an architecture other than Hotspot is running in
1451 // - then print to buffer "DLL was built for a different architecture"
1452 // else call os::lasterror to obtain system error message
1453
1454 // Read system error message into ebuf
1455 // It may or may not be overwritten below (in the for loop and just above)
1456 lasterror(ebuf, (size_t) ebuflen);
1457 ebuf[ebuflen - 1] = '\0';
1458 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1459 if (fd < 0) {
1460 return NULL;
1461 }
1462
1463 uint32_t signature_offset;
1464 uint16_t lib_arch = 0;
1465 bool failed_to_get_lib_arch =
1466 ( // Go to position 3c in the dll
1467 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1468 ||
1469 // Read location of signature
1470 (sizeof(signature_offset) !=
1471 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1472 ||
1473 // Go to COFF File Header in dll
1474 // that is located after "signature" (4 bytes long)
1475 (os::seek_to_file_offset(fd,
1476 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1477 ||
1478 // Read field that contains code of architecture
1479 // that dll was built for
1480 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1481 );
1482
1483 ::close(fd);
1484 if (failed_to_get_lib_arch) {
1485 // file i/o error - report os::lasterror(...) msg
1486 return NULL;
1487 }
1488
1489 typedef struct {
1490 uint16_t arch_code;
1491 char* arch_name;
1492 } arch_t;
1493
1494 static const arch_t arch_array[] = {
1495 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1496 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1497 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1498 };
1499 #if (defined _M_IA64)
1500 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1501 #elif (defined _M_AMD64)
1502 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1503 #elif (defined _M_IX86)
1504 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1505 #else
1506 #error Method os::dll_load requires that one of following \
1507 is defined :_M_IA64,_M_AMD64 or _M_IX86
1508 #endif
1509
1510
1511 // Obtain a string for printf operation
1512 // lib_arch_str shall contain string what platform this .dll was built for
1513 // running_arch_str shall string contain what platform Hotspot was built for
1514 char *running_arch_str = NULL, *lib_arch_str = NULL;
1515 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1516 if (lib_arch == arch_array[i].arch_code) {
1517 lib_arch_str = arch_array[i].arch_name;
1518 }
1519 if (running_arch == arch_array[i].arch_code) {
1520 running_arch_str = arch_array[i].arch_name;
1521 }
1522 }
1523
1524 assert(running_arch_str,
1525 "Didn't find running architecture code in arch_array");
1526
1527 // If the architecture is right
1528 // but some other error took place - report os::lasterror(...) msg
1529 if (lib_arch == running_arch) {
1530 return NULL;
1531 }
1532
1533 if (lib_arch_str != NULL) {
1534 ::_snprintf(ebuf, ebuflen - 1,
1535 "Can't load %s-bit .dll on a %s-bit platform",
1536 lib_arch_str, running_arch_str);
1537 } else {
1538 // don't know what architecture this dll was build for
1539 ::_snprintf(ebuf, ebuflen - 1,
1540 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1541 lib_arch, running_arch_str);
1542 }
1543
1544 return NULL;
1545 }
1546
1547 void os::print_dll_info(outputStream *st) {
1548 st->print_cr("Dynamic libraries:");
1549 get_loaded_modules_info(_print_module, (void *)st);
1550 }
1551
1552 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1553 HANDLE hProcess;
1554
1555 # define MAX_NUM_MODULES 128
1556 HMODULE modules[MAX_NUM_MODULES];
1557 static char filename[MAX_PATH];
1558 int result = 0;
1559
1560 if (!os::PSApiDll::PSApiAvailable()) {
1561 return 0;
1562 }
1563
1564 int pid = os::current_process_id();
1565 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1566 FALSE, pid);
1567 if (hProcess == NULL) return 0;
1568
1569 DWORD size_needed;
1570 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1571 sizeof(modules), &size_needed)) {
1572 CloseHandle(hProcess);
1573 return 0;
1574 }
1575
1576 // number of modules that are currently loaded
1577 int num_modules = size_needed / sizeof(HMODULE);
1578
1579 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1580 // Get Full pathname:
1581 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1582 filename, sizeof(filename))) {
1583 filename[0] = '\0';
1584 }
1585
1586 MODULEINFO modinfo;
1587 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1588 &modinfo, sizeof(modinfo))) {
1589 modinfo.lpBaseOfDll = NULL;
1590 modinfo.SizeOfImage = 0;
1591 }
1592
1593 // Invoke callback function
1594 result = callback(filename, (address)modinfo.lpBaseOfDll,
1595 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1596 if (result) break;
1597 }
1598
1599 CloseHandle(hProcess);
1600 return result;
1601 }
1602
1603 void os::print_os_info_brief(outputStream* st) {
1604 os::print_os_info(st);
1605 }
1606
1607 void os::print_os_info(outputStream* st) {
1608 #ifdef ASSERT
1609 char buffer[1024];
1610 DWORD size = sizeof(buffer);
1611 st->print(" HostName: ");
1612 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1613 st->print("%s", buffer);
1614 } else {
1615 st->print("N/A");
1616 }
1617 #endif
1618 st->print(" OS:");
1619 os::win32::print_windows_version(st);
1620 }
1621
1622 void os::win32::print_windows_version(outputStream* st) {
1623 OSVERSIONINFOEX osvi;
1624 VS_FIXEDFILEINFO *file_info;
1625 TCHAR kernel32_path[MAX_PATH];
1626 UINT len, ret;
1627
1628 // Use the GetVersionEx information to see if we're on a server or
1629 // workstation edition of Windows. Starting with Windows 8.1 we can't
1630 // trust the OS version information returned by this API.
1631 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1632 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1633 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1634 st->print_cr("Call to GetVersionEx failed");
1635 return;
1636 }
1637 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1638
1639 // Get the full path to \Windows\System32\kernel32.dll and use that for
1640 // determining what version of Windows we're running on.
1641 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1642 ret = GetSystemDirectory(kernel32_path, len);
1643 if (ret == 0 || ret > len) {
1644 st->print_cr("Call to GetSystemDirectory failed");
1645 return;
1646 }
1647 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1648
1649 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1650 if (version_size == 0) {
1651 st->print_cr("Call to GetFileVersionInfoSize failed");
1652 return;
1653 }
1654
1655 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1656 if (version_info == NULL) {
1657 st->print_cr("Failed to allocate version_info");
1658 return;
1659 }
1660
1661 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1662 os::free(version_info);
1663 st->print_cr("Call to GetFileVersionInfo failed");
1664 return;
1665 }
1666
1667 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1668 os::free(version_info);
1669 st->print_cr("Call to VerQueryValue failed");
1670 return;
1671 }
1672
1673 int major_version = HIWORD(file_info->dwProductVersionMS);
1674 int minor_version = LOWORD(file_info->dwProductVersionMS);
1675 int build_number = HIWORD(file_info->dwProductVersionLS);
1676 int build_minor = LOWORD(file_info->dwProductVersionLS);
1677 int os_vers = major_version * 1000 + minor_version;
1678 os::free(version_info);
1679
1680 st->print(" Windows ");
1681 switch (os_vers) {
1682
1683 case 6000:
1684 if (is_workstation) {
1685 st->print("Vista");
1686 } else {
1687 st->print("Server 2008");
1688 }
1689 break;
1690
1691 case 6001:
1692 if (is_workstation) {
1693 st->print("7");
1694 } else {
1695 st->print("Server 2008 R2");
1696 }
1697 break;
1698
1699 case 6002:
1700 if (is_workstation) {
1701 st->print("8");
1702 } else {
1703 st->print("Server 2012");
1704 }
1705 break;
1706
1707 case 6003:
1708 if (is_workstation) {
1709 st->print("8.1");
1710 } else {
1711 st->print("Server 2012 R2");
1712 }
1713 break;
1714
1715 case 10000:
1716 if (is_workstation) {
1717 st->print("10");
1718 } else {
1719 // The server version name of Windows 10 is not known at this time
1720 st->print("%d.%d", major_version, minor_version);
1721 }
1722 break;
1723
1724 default:
1725 // Unrecognized windows, print out its major and minor versions
1726 st->print("%d.%d", major_version, minor_version);
1727 break;
1728 }
1729
1730 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1731 // find out whether we are running on 64 bit processor or not
1732 SYSTEM_INFO si;
1733 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1734 os::Kernel32Dll::GetNativeSystemInfo(&si);
1735 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1736 st->print(" , 64 bit");
1737 }
1738
1739 st->print(" Build %d", build_number);
1740 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1741 st->cr();
1742 }
1743
1744 void os::pd_print_cpu_info(outputStream* st) {
1745 // Nothing to do for now.
1746 }
1747
1748 void os::print_memory_info(outputStream* st) {
1749 st->print("Memory:");
1750 st->print(" %dk page", os::vm_page_size()>>10);
1751
1752 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1753 // value if total memory is larger than 4GB
1754 MEMORYSTATUSEX ms;
1755 ms.dwLength = sizeof(ms);
1756 GlobalMemoryStatusEx(&ms);
1757
1758 st->print(", physical %uk", os::physical_memory() >> 10);
1759 st->print("(%uk free)", os::available_memory() >> 10);
1760
1761 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1762 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1763 st->cr();
1764 }
1765
1766 void os::print_siginfo(outputStream *st, void *siginfo) {
1767 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1768 st->print("siginfo:");
1769 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1770
1771 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1772 er->NumberParameters >= 2) {
1773 switch (er->ExceptionInformation[0]) {
1774 case 0: st->print(", reading address"); break;
1775 case 1: st->print(", writing address"); break;
1776 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1777 er->ExceptionInformation[0]);
1778 }
1779 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1780 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1781 er->NumberParameters >= 2 && UseSharedSpaces) {
1782 FileMapInfo* mapinfo = FileMapInfo::current_info();
1783 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1784 st->print("\n\nError accessing class data sharing archive." \
1785 " Mapped file inaccessible during execution, " \
1786 " possible disk/network problem.");
1787 }
1788 } else {
1789 int num = er->NumberParameters;
1790 if (num > 0) {
1791 st->print(", ExceptionInformation=");
1792 for (int i = 0; i < num; i++) {
1793 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1794 }
1795 }
1796 }
1797 st->cr();
1798 }
1799
1800 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1801 // do nothing
1802 }
1803
1804 static char saved_jvm_path[MAX_PATH] = {0};
1805
1806 // Find the full path to the current module, jvm.dll
1807 void os::jvm_path(char *buf, jint buflen) {
1808 // Error checking.
1809 if (buflen < MAX_PATH) {
1810 assert(false, "must use a large-enough buffer");
1811 buf[0] = '\0';
1812 return;
1813 }
1814 // Lazy resolve the path to current module.
1815 if (saved_jvm_path[0] != 0) {
1816 strcpy(buf, saved_jvm_path);
1817 return;
1818 }
1819
1820 buf[0] = '\0';
1821 if (Arguments::sun_java_launcher_is_altjvm()) {
1822 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1823 // for a JAVA_HOME environment variable and fix up the path so it
1824 // looks like jvm.dll is installed there (append a fake suffix
1825 // hotspot/jvm.dll).
1826 char* java_home_var = ::getenv("JAVA_HOME");
1827 if (java_home_var != NULL && java_home_var[0] != 0 &&
1828 strlen(java_home_var) < (size_t)buflen) {
1829 strncpy(buf, java_home_var, buflen);
1830
1831 // determine if this is a legacy image or modules image
1832 // modules image doesn't have "jre" subdirectory
1833 size_t len = strlen(buf);
1834 char* jrebin_p = buf + len;
1835 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1836 if (0 != _access(buf, 0)) {
1837 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1838 }
1839 len = strlen(buf);
1840 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1841 }
1842 }
1843
1844 if (buf[0] == '\0') {
1845 GetModuleFileName(vm_lib_handle, buf, buflen);
1846 }
1847 strncpy(saved_jvm_path, buf, MAX_PATH);
1848 saved_jvm_path[MAX_PATH - 1] = '\0';
1849 }
1850
1851
1852 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1853 #ifndef _WIN64
1854 st->print("_");
1855 #endif
1856 }
1857
1858
1859 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1860 #ifndef _WIN64
1861 st->print("@%d", args_size * sizeof(int));
1862 #endif
1863 }
1864
1865 // This method is a copy of JDK's sysGetLastErrorString
1866 // from src/windows/hpi/src/system_md.c
1867
1868 size_t os::lasterror(char* buf, size_t len) {
1869 DWORD errval;
1870
1871 if ((errval = GetLastError()) != 0) {
1872 // DOS error
1873 size_t n = (size_t)FormatMessage(
1874 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1875 NULL,
1876 errval,
1877 0,
1878 buf,
1879 (DWORD)len,
1880 NULL);
1881 if (n > 3) {
1882 // Drop final '.', CR, LF
1883 if (buf[n - 1] == '\n') n--;
1884 if (buf[n - 1] == '\r') n--;
1885 if (buf[n - 1] == '.') n--;
1886 buf[n] = '\0';
1887 }
1888 return n;
1889 }
1890
1891 if (errno != 0) {
1892 // C runtime error that has no corresponding DOS error code
1893 const char* s = strerror(errno);
1894 size_t n = strlen(s);
1895 if (n >= len) n = len - 1;
1896 strncpy(buf, s, n);
1897 buf[n] = '\0';
1898 return n;
1899 }
1900
1901 return 0;
1902 }
1903
1904 int os::get_last_error() {
1905 DWORD error = GetLastError();
1906 if (error == 0) {
1907 error = errno;
1908 }
1909 return (int)error;
1910 }
1911
1912 // sun.misc.Signal
1913 // NOTE that this is a workaround for an apparent kernel bug where if
1914 // a signal handler for SIGBREAK is installed then that signal handler
1915 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1916 // See bug 4416763.
1917 static void (*sigbreakHandler)(int) = NULL;
1918
1919 static void UserHandler(int sig, void *siginfo, void *context) {
1920 os::signal_notify(sig);
1921 // We need to reinstate the signal handler each time...
1922 os::signal(sig, (void*)UserHandler);
1923 }
1924
1925 void* os::user_handler() {
1926 return (void*) UserHandler;
1927 }
1928
1929 void* os::signal(int signal_number, void* handler) {
1930 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1931 void (*oldHandler)(int) = sigbreakHandler;
1932 sigbreakHandler = (void (*)(int)) handler;
1933 return (void*) oldHandler;
1934 } else {
1935 return (void*)::signal(signal_number, (void (*)(int))handler);
1936 }
1937 }
1938
1939 void os::signal_raise(int signal_number) {
1940 raise(signal_number);
1941 }
1942
1943 // The Win32 C runtime library maps all console control events other than ^C
1944 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1945 // logoff, and shutdown events. We therefore install our own console handler
1946 // that raises SIGTERM for the latter cases.
1947 //
1948 static BOOL WINAPI consoleHandler(DWORD event) {
1949 switch (event) {
1950 case CTRL_C_EVENT:
1951 if (is_error_reported()) {
1952 // Ctrl-C is pressed during error reporting, likely because the error
1953 // handler fails to abort. Let VM die immediately.
1954 os::die();
1955 }
1956
1957 os::signal_raise(SIGINT);
1958 return TRUE;
1959 break;
1960 case CTRL_BREAK_EVENT:
1961 if (sigbreakHandler != NULL) {
1962 (*sigbreakHandler)(SIGBREAK);
1963 }
1964 return TRUE;
1965 break;
1966 case CTRL_LOGOFF_EVENT: {
1967 // Don't terminate JVM if it is running in a non-interactive session,
1968 // such as a service process.
1969 USEROBJECTFLAGS flags;
1970 HANDLE handle = GetProcessWindowStation();
1971 if (handle != NULL &&
1972 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1973 sizeof(USEROBJECTFLAGS), NULL)) {
1974 // If it is a non-interactive session, let next handler to deal
1975 // with it.
1976 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1977 return FALSE;
1978 }
1979 }
1980 }
1981 case CTRL_CLOSE_EVENT:
1982 case CTRL_SHUTDOWN_EVENT:
1983 os::signal_raise(SIGTERM);
1984 return TRUE;
1985 break;
1986 default:
1987 break;
1988 }
1989 return FALSE;
1990 }
1991
1992 // The following code is moved from os.cpp for making this
1993 // code platform specific, which it is by its very nature.
1994
1995 // Return maximum OS signal used + 1 for internal use only
1996 // Used as exit signal for signal_thread
1997 int os::sigexitnum_pd() {
1998 return NSIG;
1999 }
2000
2001 // a counter for each possible signal value, including signal_thread exit signal
2002 static volatile jint pending_signals[NSIG+1] = { 0 };
2003 static HANDLE sig_sem = NULL;
2004
2005 void os::signal_init_pd() {
2006 // Initialize signal structures
2007 memset((void*)pending_signals, 0, sizeof(pending_signals));
2008
2009 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2010
2011 // Programs embedding the VM do not want it to attempt to receive
2012 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2013 // shutdown hooks mechanism introduced in 1.3. For example, when
2014 // the VM is run as part of a Windows NT service (i.e., a servlet
2015 // engine in a web server), the correct behavior is for any console
2016 // control handler to return FALSE, not TRUE, because the OS's
2017 // "final" handler for such events allows the process to continue if
2018 // it is a service (while terminating it if it is not a service).
2019 // To make this behavior uniform and the mechanism simpler, we
2020 // completely disable the VM's usage of these console events if -Xrs
2021 // (=ReduceSignalUsage) is specified. This means, for example, that
2022 // the CTRL-BREAK thread dump mechanism is also disabled in this
2023 // case. See bugs 4323062, 4345157, and related bugs.
2024
2025 if (!ReduceSignalUsage) {
2026 // Add a CTRL-C handler
2027 SetConsoleCtrlHandler(consoleHandler, TRUE);
2028 }
2029 }
2030
2031 void os::signal_notify(int signal_number) {
2032 BOOL ret;
2033 if (sig_sem != NULL) {
2034 Atomic::inc(&pending_signals[signal_number]);
2035 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2036 assert(ret != 0, "ReleaseSemaphore() failed");
2037 }
2038 }
2039
2040 static int check_pending_signals(bool wait_for_signal) {
2041 DWORD ret;
2042 while (true) {
2043 for (int i = 0; i < NSIG + 1; i++) {
2044 jint n = pending_signals[i];
2045 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2046 return i;
2047 }
2048 }
2049 if (!wait_for_signal) {
2050 return -1;
2051 }
2052
2053 JavaThread *thread = JavaThread::current();
2054
2055 ThreadBlockInVM tbivm(thread);
2056
2057 bool threadIsSuspended;
2058 do {
2059 thread->set_suspend_equivalent();
2060 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2061 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2062 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2063
2064 // were we externally suspended while we were waiting?
2065 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2066 if (threadIsSuspended) {
2067 // The semaphore has been incremented, but while we were waiting
2068 // another thread suspended us. We don't want to continue running
2069 // while suspended because that would surprise the thread that
2070 // suspended us.
2071 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2072 assert(ret != 0, "ReleaseSemaphore() failed");
2073
2074 thread->java_suspend_self();
2075 }
2076 } while (threadIsSuspended);
2077 }
2078 }
2079
2080 int os::signal_lookup() {
2081 return check_pending_signals(false);
2082 }
2083
2084 int os::signal_wait() {
2085 return check_pending_signals(true);
2086 }
2087
2088 // Implicit OS exception handling
2089
2090 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2091 address handler) {
2092 JavaThread* thread = JavaThread::current();
2093 // Save pc in thread
2094 #ifdef _M_IA64
2095 // Do not blow up if no thread info available.
2096 if (thread) {
2097 // Saving PRECISE pc (with slot information) in thread.
2098 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2099 // Convert precise PC into "Unix" format
2100 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2101 thread->set_saved_exception_pc((address)precise_pc);
2102 }
2103 // Set pc to handler
2104 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2105 // Clear out psr.ri (= Restart Instruction) in order to continue
2106 // at the beginning of the target bundle.
2107 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2108 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2109 #elif _M_AMD64
2110 // Do not blow up if no thread info available.
2111 if (thread) {
2112 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2113 }
2114 // Set pc to handler
2115 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2116 #else
2117 // Do not blow up if no thread info available.
2118 if (thread) {
2119 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2120 }
2121 // Set pc to handler
2122 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2123 #endif
2124
2125 // Continue the execution
2126 return EXCEPTION_CONTINUE_EXECUTION;
2127 }
2128
2129
2130 // Used for PostMortemDump
2131 extern "C" void safepoints();
2132 extern "C" void find(int x);
2133 extern "C" void events();
2134
2135 // According to Windows API documentation, an illegal instruction sequence should generate
2136 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2137 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2138 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2139
2140 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2141
2142 // From "Execution Protection in the Windows Operating System" draft 0.35
2143 // Once a system header becomes available, the "real" define should be
2144 // included or copied here.
2145 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2146
2147 // Handle NAT Bit consumption on IA64.
2148 #ifdef _M_IA64
2149 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2150 #endif
2151
2152 // Windows Vista/2008 heap corruption check
2153 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2154
2155 #define def_excpt(val) #val, val
2156
2157 struct siglabel {
2158 char *name;
2159 int number;
2160 };
2161
2162 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2163 // C++ compiler contain this error code. Because this is a compiler-generated
2164 // error, the code is not listed in the Win32 API header files.
2165 // The code is actually a cryptic mnemonic device, with the initial "E"
2166 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2167 // ASCII values of "msc".
2168
2169 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2170
2171
2172 struct siglabel exceptlabels[] = {
2173 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2174 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2175 def_excpt(EXCEPTION_BREAKPOINT),
2176 def_excpt(EXCEPTION_SINGLE_STEP),
2177 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2178 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2179 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2180 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2181 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2182 def_excpt(EXCEPTION_FLT_OVERFLOW),
2183 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2184 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2185 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2186 def_excpt(EXCEPTION_INT_OVERFLOW),
2187 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2188 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2189 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2191 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2192 def_excpt(EXCEPTION_STACK_OVERFLOW),
2193 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2194 def_excpt(EXCEPTION_GUARD_PAGE),
2195 def_excpt(EXCEPTION_INVALID_HANDLE),
2196 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2197 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2198 #ifdef _M_IA64
2199 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2200 #endif
2201 NULL, 0
2202 };
2203
2204 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2205 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2206 if (exceptlabels[i].number == exception_code) {
2207 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2208 return buf;
2209 }
2210 }
2211
2212 return NULL;
2213 }
2214
2215 //-----------------------------------------------------------------------------
2216 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2217 // handle exception caused by idiv; should only happen for -MinInt/-1
2218 // (division by zero is handled explicitly)
2219 #ifdef _M_IA64
2220 assert(0, "Fix Handle_IDiv_Exception");
2221 #elif _M_AMD64
2222 PCONTEXT ctx = exceptionInfo->ContextRecord;
2223 address pc = (address)ctx->Rip;
2224 assert(pc[0] == 0xF7, "not an idiv opcode");
2225 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2226 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2227 // set correct result values and continue after idiv instruction
2228 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2229 ctx->Rax = (DWORD)min_jint; // result
2230 ctx->Rdx = (DWORD)0; // remainder
2231 // Continue the execution
2232 #else
2233 PCONTEXT ctx = exceptionInfo->ContextRecord;
2234 address pc = (address)ctx->Eip;
2235 assert(pc[0] == 0xF7, "not an idiv opcode");
2236 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2237 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2238 // set correct result values and continue after idiv instruction
2239 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2240 ctx->Eax = (DWORD)min_jint; // result
2241 ctx->Edx = (DWORD)0; // remainder
2242 // Continue the execution
2243 #endif
2244 return EXCEPTION_CONTINUE_EXECUTION;
2245 }
2246
2247 //-----------------------------------------------------------------------------
2248 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2249 PCONTEXT ctx = exceptionInfo->ContextRecord;
2250 #ifndef _WIN64
2251 // handle exception caused by native method modifying control word
2252 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2253
2254 switch (exception_code) {
2255 case EXCEPTION_FLT_DENORMAL_OPERAND:
2256 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2257 case EXCEPTION_FLT_INEXACT_RESULT:
2258 case EXCEPTION_FLT_INVALID_OPERATION:
2259 case EXCEPTION_FLT_OVERFLOW:
2260 case EXCEPTION_FLT_STACK_CHECK:
2261 case EXCEPTION_FLT_UNDERFLOW:
2262 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2263 if (fp_control_word != ctx->FloatSave.ControlWord) {
2264 // Restore FPCW and mask out FLT exceptions
2265 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2266 // Mask out pending FLT exceptions
2267 ctx->FloatSave.StatusWord &= 0xffffff00;
2268 return EXCEPTION_CONTINUE_EXECUTION;
2269 }
2270 }
2271
2272 if (prev_uef_handler != NULL) {
2273 // We didn't handle this exception so pass it to the previous
2274 // UnhandledExceptionFilter.
2275 return (prev_uef_handler)(exceptionInfo);
2276 }
2277 #else // !_WIN64
2278 // On Windows, the mxcsr control bits are non-volatile across calls
2279 // See also CR 6192333
2280 //
2281 jint MxCsr = INITIAL_MXCSR;
2282 // we can't use StubRoutines::addr_mxcsr_std()
2283 // because in Win64 mxcsr is not saved there
2284 if (MxCsr != ctx->MxCsr) {
2285 ctx->MxCsr = MxCsr;
2286 return EXCEPTION_CONTINUE_EXECUTION;
2287 }
2288 #endif // !_WIN64
2289
2290 return EXCEPTION_CONTINUE_SEARCH;
2291 }
2292
2293 static inline void report_error(Thread* t, DWORD exception_code,
2294 address addr, void* siginfo, void* context) {
2295 VMError err(t, exception_code, addr, siginfo, context);
2296 err.report_and_die();
2297
2298 // If UseOsErrorReporting, this will return here and save the error file
2299 // somewhere where we can find it in the minidump.
2300 }
2301
2302 //-----------------------------------------------------------------------------
2303 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2304 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2305 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2306 #ifdef _M_IA64
2307 // On Itanium, we need the "precise pc", which has the slot number coded
2308 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2309 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2310 // Convert the pc to "Unix format", which has the slot number coded
2311 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2312 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2313 // information is saved in the Unix format.
2314 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2315 #elif _M_AMD64
2316 address pc = (address) exceptionInfo->ContextRecord->Rip;
2317 #else
2318 address pc = (address) exceptionInfo->ContextRecord->Eip;
2319 #endif
2320 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2321
2322 // Handle SafeFetch32 and SafeFetchN exceptions.
2323 if (StubRoutines::is_safefetch_fault(pc)) {
2324 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2325 }
2326
2327 #ifndef _WIN64
2328 // Execution protection violation - win32 running on AMD64 only
2329 // Handled first to avoid misdiagnosis as a "normal" access violation;
2330 // This is safe to do because we have a new/unique ExceptionInformation
2331 // code for this condition.
2332 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2333 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2334 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2335 address addr = (address) exceptionRecord->ExceptionInformation[1];
2336
2337 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2338 int page_size = os::vm_page_size();
2339
2340 // Make sure the pc and the faulting address are sane.
2341 //
2342 // If an instruction spans a page boundary, and the page containing
2343 // the beginning of the instruction is executable but the following
2344 // page is not, the pc and the faulting address might be slightly
2345 // different - we still want to unguard the 2nd page in this case.
2346 //
2347 // 15 bytes seems to be a (very) safe value for max instruction size.
2348 bool pc_is_near_addr =
2349 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2350 bool instr_spans_page_boundary =
2351 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2352 (intptr_t) page_size) > 0);
2353
2354 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2355 static volatile address last_addr =
2356 (address) os::non_memory_address_word();
2357
2358 // In conservative mode, don't unguard unless the address is in the VM
2359 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2360 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2361
2362 // Set memory to RWX and retry
2363 address page_start =
2364 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2365 bool res = os::protect_memory((char*) page_start, page_size,
2366 os::MEM_PROT_RWX);
2367
2368 if (PrintMiscellaneous && Verbose) {
2369 char buf[256];
2370 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2371 "at " INTPTR_FORMAT
2372 ", unguarding " INTPTR_FORMAT ": %s", addr,
2373 page_start, (res ? "success" : strerror(errno)));
2374 tty->print_raw_cr(buf);
2375 }
2376
2377 // Set last_addr so if we fault again at the same address, we don't
2378 // end up in an endless loop.
2379 //
2380 // There are two potential complications here. Two threads trapping
2381 // at the same address at the same time could cause one of the
2382 // threads to think it already unguarded, and abort the VM. Likely
2383 // very rare.
2384 //
2385 // The other race involves two threads alternately trapping at
2386 // different addresses and failing to unguard the page, resulting in
2387 // an endless loop. This condition is probably even more unlikely
2388 // than the first.
2389 //
2390 // Although both cases could be avoided by using locks or thread
2391 // local last_addr, these solutions are unnecessary complication:
2392 // this handler is a best-effort safety net, not a complete solution.
2393 // It is disabled by default and should only be used as a workaround
2394 // in case we missed any no-execute-unsafe VM code.
2395
2396 last_addr = addr;
2397
2398 return EXCEPTION_CONTINUE_EXECUTION;
2399 }
2400 }
2401
2402 // Last unguard failed or not unguarding
2403 tty->print_raw_cr("Execution protection violation");
2404 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2405 exceptionInfo->ContextRecord);
2406 return EXCEPTION_CONTINUE_SEARCH;
2407 }
2408 }
2409 #endif // _WIN64
2410
2411 // Check to see if we caught the safepoint code in the
2412 // process of write protecting the memory serialization page.
2413 // It write enables the page immediately after protecting it
2414 // so just return.
2415 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2416 JavaThread* thread = (JavaThread*) t;
2417 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2418 address addr = (address) exceptionRecord->ExceptionInformation[1];
2419 if (os::is_memory_serialize_page(thread, addr)) {
2420 // Block current thread until the memory serialize page permission restored.
2421 os::block_on_serialize_page_trap();
2422 return EXCEPTION_CONTINUE_EXECUTION;
2423 }
2424 }
2425
2426 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2427 VM_Version::is_cpuinfo_segv_addr(pc)) {
2428 // Verify that OS save/restore AVX registers.
2429 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2430 }
2431
2432 if (t != NULL && t->is_Java_thread()) {
2433 JavaThread* thread = (JavaThread*) t;
2434 bool in_java = thread->thread_state() == _thread_in_Java;
2435
2436 // Handle potential stack overflows up front.
2437 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2438 if (os::uses_stack_guard_pages()) {
2439 #ifdef _M_IA64
2440 // Use guard page for register stack.
2441 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2442 address addr = (address) exceptionRecord->ExceptionInformation[1];
2443 // Check for a register stack overflow on Itanium
2444 if (thread->addr_inside_register_stack_red_zone(addr)) {
2445 // Fatal red zone violation happens if the Java program
2446 // catches a StackOverflow error and does so much processing
2447 // that it runs beyond the unprotected yellow guard zone. As
2448 // a result, we are out of here.
2449 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2450 } else if(thread->addr_inside_register_stack(addr)) {
2451 // Disable the yellow zone which sets the state that
2452 // we've got a stack overflow problem.
2453 if (thread->stack_yellow_zone_enabled()) {
2454 thread->disable_stack_yellow_zone();
2455 }
2456 // Give us some room to process the exception.
2457 thread->disable_register_stack_guard();
2458 // Tracing with +Verbose.
2459 if (Verbose) {
2460 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2461 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2462 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2463 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2464 thread->register_stack_base(),
2465 thread->register_stack_base() + thread->stack_size());
2466 }
2467
2468 // Reguard the permanent register stack red zone just to be sure.
2469 // We saw Windows silently disabling this without telling us.
2470 thread->enable_register_stack_red_zone();
2471
2472 return Handle_Exception(exceptionInfo,
2473 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2474 }
2475 #endif
2476 if (thread->stack_yellow_zone_enabled()) {
2477 // Yellow zone violation. The o/s has unprotected the first yellow
2478 // zone page for us. Note: must call disable_stack_yellow_zone to
2479 // update the enabled status, even if the zone contains only one page.
2480 thread->disable_stack_yellow_zone();
2481 // If not in java code, return and hope for the best.
2482 return in_java
2483 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2484 : EXCEPTION_CONTINUE_EXECUTION;
2485 } else {
2486 // Fatal red zone violation.
2487 thread->disable_stack_red_zone();
2488 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2489 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2490 exceptionInfo->ContextRecord);
2491 return EXCEPTION_CONTINUE_SEARCH;
2492 }
2493 } else if (in_java) {
2494 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2495 // a one-time-only guard page, which it has released to us. The next
2496 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2497 return Handle_Exception(exceptionInfo,
2498 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2499 } else {
2500 // Can only return and hope for the best. Further stack growth will
2501 // result in an ACCESS_VIOLATION.
2502 return EXCEPTION_CONTINUE_EXECUTION;
2503 }
2504 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2505 // Either stack overflow or null pointer exception.
2506 if (in_java) {
2507 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2508 address addr = (address) exceptionRecord->ExceptionInformation[1];
2509 address stack_end = thread->stack_base() - thread->stack_size();
2510 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2511 // Stack overflow.
2512 assert(!os::uses_stack_guard_pages(),
2513 "should be caught by red zone code above.");
2514 return Handle_Exception(exceptionInfo,
2515 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2516 }
2517 // Check for safepoint polling and implicit null
2518 // We only expect null pointers in the stubs (vtable)
2519 // the rest are checked explicitly now.
2520 CodeBlob* cb = CodeCache::find_blob(pc);
2521 if (cb != NULL) {
2522 if (os::is_poll_address(addr)) {
2523 address stub = SharedRuntime::get_poll_stub(pc);
2524 return Handle_Exception(exceptionInfo, stub);
2525 }
2526 }
2527 {
2528 #ifdef _WIN64
2529 // If it's a legal stack address map the entire region in
2530 //
2531 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2532 address addr = (address) exceptionRecord->ExceptionInformation[1];
2533 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2534 addr = (address)((uintptr_t)addr &
2535 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2536 os::commit_memory((char *)addr, thread->stack_base() - addr,
2537 !ExecMem);
2538 return EXCEPTION_CONTINUE_EXECUTION;
2539 } else
2540 #endif
2541 {
2542 // Null pointer exception.
2543 #ifdef _M_IA64
2544 // Process implicit null checks in compiled code. Note: Implicit null checks
2545 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2546 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2547 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2548 // Handle implicit null check in UEP method entry
2549 if (cb && (cb->is_frame_complete_at(pc) ||
2550 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2551 if (Verbose) {
2552 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2553 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2554 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2555 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2556 *(bundle_start + 1), *bundle_start);
2557 }
2558 return Handle_Exception(exceptionInfo,
2559 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2560 }
2561 }
2562
2563 // Implicit null checks were processed above. Hence, we should not reach
2564 // here in the usual case => die!
2565 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2566 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2567 exceptionInfo->ContextRecord);
2568 return EXCEPTION_CONTINUE_SEARCH;
2569
2570 #else // !IA64
2571
2572 // Windows 98 reports faulting addresses incorrectly
2573 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2574 !os::win32::is_nt()) {
2575 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2576 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2577 }
2578 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2579 exceptionInfo->ContextRecord);
2580 return EXCEPTION_CONTINUE_SEARCH;
2581 #endif
2582 }
2583 }
2584 }
2585
2586 #ifdef _WIN64
2587 // Special care for fast JNI field accessors.
2588 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2589 // in and the heap gets shrunk before the field access.
2590 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2591 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2592 if (addr != (address)-1) {
2593 return Handle_Exception(exceptionInfo, addr);
2594 }
2595 }
2596 #endif
2597
2598 // Stack overflow or null pointer exception in native code.
2599 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2600 exceptionInfo->ContextRecord);
2601 return EXCEPTION_CONTINUE_SEARCH;
2602 } // /EXCEPTION_ACCESS_VIOLATION
2603 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2604 #if defined _M_IA64
2605 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2606 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2607 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2608
2609 // Compiled method patched to be non entrant? Following conditions must apply:
2610 // 1. must be first instruction in bundle
2611 // 2. must be a break instruction with appropriate code
2612 if ((((uint64_t) pc & 0x0F) == 0) &&
2613 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2614 return Handle_Exception(exceptionInfo,
2615 (address)SharedRuntime::get_handle_wrong_method_stub());
2616 }
2617 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2618 #endif
2619
2620
2621 if (in_java) {
2622 switch (exception_code) {
2623 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2624 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2625
2626 case EXCEPTION_INT_OVERFLOW:
2627 return Handle_IDiv_Exception(exceptionInfo);
2628
2629 } // switch
2630 }
2631 if (((thread->thread_state() == _thread_in_Java) ||
2632 (thread->thread_state() == _thread_in_native)) &&
2633 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2634 LONG result=Handle_FLT_Exception(exceptionInfo);
2635 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2636 }
2637 }
2638
2639 if (exception_code != EXCEPTION_BREAKPOINT) {
2640 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2641 exceptionInfo->ContextRecord);
2642 }
2643 return EXCEPTION_CONTINUE_SEARCH;
2644 }
2645
2646 #ifndef _WIN64
2647 // Special care for fast JNI accessors.
2648 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2649 // the heap gets shrunk before the field access.
2650 // Need to install our own structured exception handler since native code may
2651 // install its own.
2652 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2653 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2654 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2655 address pc = (address) exceptionInfo->ContextRecord->Eip;
2656 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2657 if (addr != (address)-1) {
2658 return Handle_Exception(exceptionInfo, addr);
2659 }
2660 }
2661 return EXCEPTION_CONTINUE_SEARCH;
2662 }
2663
2664 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2665 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2666 jobject obj, \
2667 jfieldID fieldID) { \
2668 __try { \
2669 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2670 obj, \
2671 fieldID); \
2672 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2673 _exception_info())) { \
2674 } \
2675 return 0; \
2676 }
2677
2678 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2679 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2680 DEFINE_FAST_GETFIELD(jchar, char, Char)
2681 DEFINE_FAST_GETFIELD(jshort, short, Short)
2682 DEFINE_FAST_GETFIELD(jint, int, Int)
2683 DEFINE_FAST_GETFIELD(jlong, long, Long)
2684 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2685 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2686
2687 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2688 switch (type) {
2689 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2690 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2691 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2692 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2693 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2694 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2695 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2696 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2697 default: ShouldNotReachHere();
2698 }
2699 return (address)-1;
2700 }
2701 #endif
2702
2703 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2704 // Install a win32 structured exception handler around the test
2705 // function call so the VM can generate an error dump if needed.
2706 __try {
2707 (*funcPtr)();
2708 } __except(topLevelExceptionFilter(
2709 (_EXCEPTION_POINTERS*)_exception_info())) {
2710 // Nothing to do.
2711 }
2712 }
2713
2714 // Virtual Memory
2715
2716 int os::vm_page_size() { return os::win32::vm_page_size(); }
2717 int os::vm_allocation_granularity() {
2718 return os::win32::vm_allocation_granularity();
2719 }
2720
2721 // Windows large page support is available on Windows 2003. In order to use
2722 // large page memory, the administrator must first assign additional privilege
2723 // to the user:
2724 // + select Control Panel -> Administrative Tools -> Local Security Policy
2725 // + select Local Policies -> User Rights Assignment
2726 // + double click "Lock pages in memory", add users and/or groups
2727 // + reboot
2728 // Note the above steps are needed for administrator as well, as administrators
2729 // by default do not have the privilege to lock pages in memory.
2730 //
2731 // Note about Windows 2003: although the API supports committing large page
2732 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2733 // scenario, I found through experiment it only uses large page if the entire
2734 // memory region is reserved and committed in a single VirtualAlloc() call.
2735 // This makes Windows large page support more or less like Solaris ISM, in
2736 // that the entire heap must be committed upfront. This probably will change
2737 // in the future, if so the code below needs to be revisited.
2738
2739 #ifndef MEM_LARGE_PAGES
2740 #define MEM_LARGE_PAGES 0x20000000
2741 #endif
2742
2743 static HANDLE _hProcess;
2744 static HANDLE _hToken;
2745
2746 // Container for NUMA node list info
2747 class NUMANodeListHolder {
2748 private:
2749 int *_numa_used_node_list; // allocated below
2750 int _numa_used_node_count;
2751
2752 void free_node_list() {
2753 if (_numa_used_node_list != NULL) {
2754 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2755 }
2756 }
2757
2758 public:
2759 NUMANodeListHolder() {
2760 _numa_used_node_count = 0;
2761 _numa_used_node_list = NULL;
2762 // do rest of initialization in build routine (after function pointers are set up)
2763 }
2764
2765 ~NUMANodeListHolder() {
2766 free_node_list();
2767 }
2768
2769 bool build() {
2770 DWORD_PTR proc_aff_mask;
2771 DWORD_PTR sys_aff_mask;
2772 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2773 ULONG highest_node_number;
2774 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2775 free_node_list();
2776 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2777 for (unsigned int i = 0; i <= highest_node_number; i++) {
2778 ULONGLONG proc_mask_numa_node;
2779 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2780 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2781 _numa_used_node_list[_numa_used_node_count++] = i;
2782 }
2783 }
2784 return (_numa_used_node_count > 1);
2785 }
2786
2787 int get_count() { return _numa_used_node_count; }
2788 int get_node_list_entry(int n) {
2789 // for indexes out of range, returns -1
2790 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2791 }
2792
2793 } numa_node_list_holder;
2794
2795
2796
2797 static size_t _large_page_size = 0;
2798
2799 static bool resolve_functions_for_large_page_init() {
2800 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2801 os::Advapi32Dll::AdvapiAvailable();
2802 }
2803
2804 static bool request_lock_memory_privilege() {
2805 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2806 os::current_process_id());
2807
2808 LUID luid;
2809 if (_hProcess != NULL &&
2810 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2811 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2812
2813 TOKEN_PRIVILEGES tp;
2814 tp.PrivilegeCount = 1;
2815 tp.Privileges[0].Luid = luid;
2816 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2817
2818 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2819 // privilege. Check GetLastError() too. See MSDN document.
2820 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2821 (GetLastError() == ERROR_SUCCESS)) {
2822 return true;
2823 }
2824 }
2825
2826 return false;
2827 }
2828
2829 static void cleanup_after_large_page_init() {
2830 if (_hProcess) CloseHandle(_hProcess);
2831 _hProcess = NULL;
2832 if (_hToken) CloseHandle(_hToken);
2833 _hToken = NULL;
2834 }
2835
2836 static bool numa_interleaving_init() {
2837 bool success = false;
2838 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2839
2840 // print a warning if UseNUMAInterleaving flag is specified on command line
2841 bool warn_on_failure = use_numa_interleaving_specified;
2842 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2843
2844 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2845 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2846 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2847
2848 if (os::Kernel32Dll::NumaCallsAvailable()) {
2849 if (numa_node_list_holder.build()) {
2850 if (PrintMiscellaneous && Verbose) {
2851 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2852 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2853 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2854 }
2855 tty->print("\n");
2856 }
2857 success = true;
2858 } else {
2859 WARN("Process does not cover multiple NUMA nodes.");
2860 }
2861 } else {
2862 WARN("NUMA Interleaving is not supported by the operating system.");
2863 }
2864 if (!success) {
2865 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2866 }
2867 return success;
2868 #undef WARN
2869 }
2870
2871 // this routine is used whenever we need to reserve a contiguous VA range
2872 // but we need to make separate VirtualAlloc calls for each piece of the range
2873 // Reasons for doing this:
2874 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2875 // * UseNUMAInterleaving requires a separate node for each piece
2876 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2877 DWORD prot,
2878 bool should_inject_error = false) {
2879 char * p_buf;
2880 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2881 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2882 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2883
2884 // first reserve enough address space in advance since we want to be
2885 // able to break a single contiguous virtual address range into multiple
2886 // large page commits but WS2003 does not allow reserving large page space
2887 // so we just use 4K pages for reserve, this gives us a legal contiguous
2888 // address space. then we will deallocate that reservation, and re alloc
2889 // using large pages
2890 const size_t size_of_reserve = bytes + chunk_size;
2891 if (bytes > size_of_reserve) {
2892 // Overflowed.
2893 return NULL;
2894 }
2895 p_buf = (char *) VirtualAlloc(addr,
2896 size_of_reserve, // size of Reserve
2897 MEM_RESERVE,
2898 PAGE_READWRITE);
2899 // If reservation failed, return NULL
2900 if (p_buf == NULL) return NULL;
2901 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2902 os::release_memory(p_buf, bytes + chunk_size);
2903
2904 // we still need to round up to a page boundary (in case we are using large pages)
2905 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2906 // instead we handle this in the bytes_to_rq computation below
2907 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2908
2909 // now go through and allocate one chunk at a time until all bytes are
2910 // allocated
2911 size_t bytes_remaining = bytes;
2912 // An overflow of align_size_up() would have been caught above
2913 // in the calculation of size_of_reserve.
2914 char * next_alloc_addr = p_buf;
2915 HANDLE hProc = GetCurrentProcess();
2916
2917 #ifdef ASSERT
2918 // Variable for the failure injection
2919 long ran_num = os::random();
2920 size_t fail_after = ran_num % bytes;
2921 #endif
2922
2923 int count=0;
2924 while (bytes_remaining) {
2925 // select bytes_to_rq to get to the next chunk_size boundary
2926
2927 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2928 // Note allocate and commit
2929 char * p_new;
2930
2931 #ifdef ASSERT
2932 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2933 #else
2934 const bool inject_error_now = false;
2935 #endif
2936
2937 if (inject_error_now) {
2938 p_new = NULL;
2939 } else {
2940 if (!UseNUMAInterleaving) {
2941 p_new = (char *) VirtualAlloc(next_alloc_addr,
2942 bytes_to_rq,
2943 flags,
2944 prot);
2945 } else {
2946 // get the next node to use from the used_node_list
2947 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2948 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2949 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2950 next_alloc_addr,
2951 bytes_to_rq,
2952 flags,
2953 prot,
2954 node);
2955 }
2956 }
2957
2958 if (p_new == NULL) {
2959 // Free any allocated pages
2960 if (next_alloc_addr > p_buf) {
2961 // Some memory was committed so release it.
2962 size_t bytes_to_release = bytes - bytes_remaining;
2963 // NMT has yet to record any individual blocks, so it
2964 // need to create a dummy 'reserve' record to match
2965 // the release.
2966 MemTracker::record_virtual_memory_reserve((address)p_buf,
2967 bytes_to_release, CALLER_PC);
2968 os::release_memory(p_buf, bytes_to_release);
2969 }
2970 #ifdef ASSERT
2971 if (should_inject_error) {
2972 if (TracePageSizes && Verbose) {
2973 tty->print_cr("Reserving pages individually failed.");
2974 }
2975 }
2976 #endif
2977 return NULL;
2978 }
2979
2980 bytes_remaining -= bytes_to_rq;
2981 next_alloc_addr += bytes_to_rq;
2982 count++;
2983 }
2984 // Although the memory is allocated individually, it is returned as one.
2985 // NMT records it as one block.
2986 if ((flags & MEM_COMMIT) != 0) {
2987 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2988 } else {
2989 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2990 }
2991
2992 // made it this far, success
2993 return p_buf;
2994 }
2995
2996
2997
2998 void os::large_page_init() {
2999 if (!UseLargePages) return;
3000
3001 // print a warning if any large page related flag is specified on command line
3002 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3003 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3004 bool success = false;
3005
3006 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3007 if (resolve_functions_for_large_page_init()) {
3008 if (request_lock_memory_privilege()) {
3009 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3010 if (s) {
3011 #if defined(IA32) || defined(AMD64)
3012 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3013 WARN("JVM cannot use large pages bigger than 4mb.");
3014 } else {
3015 #endif
3016 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3017 _large_page_size = LargePageSizeInBytes;
3018 } else {
3019 _large_page_size = s;
3020 }
3021 success = true;
3022 #if defined(IA32) || defined(AMD64)
3023 }
3024 #endif
3025 } else {
3026 WARN("Large page is not supported by the processor.");
3027 }
3028 } else {
3029 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3030 }
3031 } else {
3032 WARN("Large page is not supported by the operating system.");
3033 }
3034 #undef WARN
3035
3036 const size_t default_page_size = (size_t) vm_page_size();
3037 if (success && _large_page_size > default_page_size) {
3038 _page_sizes[0] = _large_page_size;
3039 _page_sizes[1] = default_page_size;
3040 _page_sizes[2] = 0;
3041 }
3042
3043 cleanup_after_large_page_init();
3044 UseLargePages = success;
3045 }
3046
3047 // On win32, one cannot release just a part of reserved memory, it's an
3048 // all or nothing deal. When we split a reservation, we must break the
3049 // reservation into two reservations.
3050 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3051 bool realloc) {
3052 if (size > 0) {
3053 release_memory(base, size);
3054 if (realloc) {
3055 reserve_memory(split, base);
3056 }
3057 if (size != split) {
3058 reserve_memory(size - split, base + split);
3059 }
3060 }
3061 }
3062
3063 // Multiple threads can race in this code but it's not possible to unmap small sections of
3064 // virtual space to get requested alignment, like posix-like os's.
3065 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3066 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3067 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3068 "Alignment must be a multiple of allocation granularity (page size)");
3069 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3070
3071 size_t extra_size = size + alignment;
3072 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3073
3074 char* aligned_base = NULL;
3075
3076 do {
3077 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3078 if (extra_base == NULL) {
3079 return NULL;
3080 }
3081 // Do manual alignment
3082 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3083
3084 os::release_memory(extra_base, extra_size);
3085
3086 aligned_base = os::reserve_memory(size, aligned_base);
3087
3088 } while (aligned_base == NULL);
3089
3090 return aligned_base;
3091 }
3092
3093 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3094 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3095 "reserve alignment");
3096 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3097 char* res;
3098 // note that if UseLargePages is on, all the areas that require interleaving
3099 // will go thru reserve_memory_special rather than thru here.
3100 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3101 if (!use_individual) {
3102 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3103 } else {
3104 elapsedTimer reserveTimer;
3105 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3106 // in numa interleaving, we have to allocate pages individually
3107 // (well really chunks of NUMAInterleaveGranularity size)
3108 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3109 if (res == NULL) {
3110 warning("NUMA page allocation failed");
3111 }
3112 if (Verbose && PrintMiscellaneous) {
3113 reserveTimer.stop();
3114 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3115 reserveTimer.milliseconds(), reserveTimer.ticks());
3116 }
3117 }
3118 assert(res == NULL || addr == NULL || addr == res,
3119 "Unexpected address from reserve.");
3120
3121 return res;
3122 }
3123
3124 // Reserve memory at an arbitrary address, only if that area is
3125 // available (and not reserved for something else).
3126 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3127 // Windows os::reserve_memory() fails of the requested address range is
3128 // not avilable.
3129 return reserve_memory(bytes, requested_addr);
3130 }
3131
3132 size_t os::large_page_size() {
3133 return _large_page_size;
3134 }
3135
3136 bool os::can_commit_large_page_memory() {
3137 // Windows only uses large page memory when the entire region is reserved
3138 // and committed in a single VirtualAlloc() call. This may change in the
3139 // future, but with Windows 2003 it's not possible to commit on demand.
3140 return false;
3141 }
3142
3143 bool os::can_execute_large_page_memory() {
3144 return true;
3145 }
3146
3147 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3148 bool exec) {
3149 assert(UseLargePages, "only for large pages");
3150
3151 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3152 return NULL; // Fallback to small pages.
3153 }
3154
3155 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3156 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3157
3158 // with large pages, there are two cases where we need to use Individual Allocation
3159 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3160 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3161 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3162 if (TracePageSizes && Verbose) {
3163 tty->print_cr("Reserving large pages individually.");
3164 }
3165 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3166 if (p_buf == NULL) {
3167 // give an appropriate warning message
3168 if (UseNUMAInterleaving) {
3169 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3170 }
3171 if (UseLargePagesIndividualAllocation) {
3172 warning("Individually allocated large pages failed, "
3173 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3174 }
3175 return NULL;
3176 }
3177
3178 return p_buf;
3179
3180 } else {
3181 if (TracePageSizes && Verbose) {
3182 tty->print_cr("Reserving large pages in a single large chunk.");
3183 }
3184 // normal policy just allocate it all at once
3185 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3186 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3187 if (res != NULL) {
3188 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3189 }
3190
3191 return res;
3192 }
3193 }
3194
3195 bool os::release_memory_special(char* base, size_t bytes) {
3196 assert(base != NULL, "Sanity check");
3197 return release_memory(base, bytes);
3198 }
3199
3200 void os::print_statistics() {
3201 }
3202
3203 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3204 int err = os::get_last_error();
3205 char buf[256];
3206 size_t buf_len = os::lasterror(buf, sizeof(buf));
3207 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3208 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3209 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3210 }
3211
3212 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3213 if (bytes == 0) {
3214 // Don't bother the OS with noops.
3215 return true;
3216 }
3217 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3218 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3219 // Don't attempt to print anything if the OS call fails. We're
3220 // probably low on resources, so the print itself may cause crashes.
3221
3222 // unless we have NUMAInterleaving enabled, the range of a commit
3223 // is always within a reserve covered by a single VirtualAlloc
3224 // in that case we can just do a single commit for the requested size
3225 if (!UseNUMAInterleaving) {
3226 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3227 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3228 return false;
3229 }
3230 if (exec) {
3231 DWORD oldprot;
3232 // Windows doc says to use VirtualProtect to get execute permissions
3233 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3234 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3235 return false;
3236 }
3237 }
3238 return true;
3239 } else {
3240
3241 // when NUMAInterleaving is enabled, the commit might cover a range that
3242 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3243 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3244 // returns represents the number of bytes that can be committed in one step.
3245 size_t bytes_remaining = bytes;
3246 char * next_alloc_addr = addr;
3247 while (bytes_remaining > 0) {
3248 MEMORY_BASIC_INFORMATION alloc_info;
3249 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3250 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3251 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3252 PAGE_READWRITE) == NULL) {
3253 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3254 exec);)
3255 return false;
3256 }
3257 if (exec) {
3258 DWORD oldprot;
3259 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3260 PAGE_EXECUTE_READWRITE, &oldprot)) {
3261 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3262 exec);)
3263 return false;
3264 }
3265 }
3266 bytes_remaining -= bytes_to_rq;
3267 next_alloc_addr += bytes_to_rq;
3268 }
3269 }
3270 // if we made it this far, return true
3271 return true;
3272 }
3273
3274 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3275 bool exec) {
3276 // alignment_hint is ignored on this OS
3277 return pd_commit_memory(addr, size, exec);
3278 }
3279
3280 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3281 const char* mesg) {
3282 assert(mesg != NULL, "mesg must be specified");
3283 if (!pd_commit_memory(addr, size, exec)) {
3284 warn_fail_commit_memory(addr, size, exec);
3285 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3286 }
3287 }
3288
3289 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3290 size_t alignment_hint, bool exec,
3291 const char* mesg) {
3292 // alignment_hint is ignored on this OS
3293 pd_commit_memory_or_exit(addr, size, exec, mesg);
3294 }
3295
3296 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3297 if (bytes == 0) {
3298 // Don't bother the OS with noops.
3299 return true;
3300 }
3301 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3302 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3303 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3304 }
3305
3306 bool os::pd_release_memory(char* addr, size_t bytes) {
3307 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3308 }
3309
3310 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3311 return os::commit_memory(addr, size, !ExecMem);
3312 }
3313
3314 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3315 return os::uncommit_memory(addr, size);
3316 }
3317
3318 // Set protections specified
3319 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3320 bool is_committed) {
3321 unsigned int p = 0;
3322 switch (prot) {
3323 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3324 case MEM_PROT_READ: p = PAGE_READONLY; break;
3325 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3326 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3327 default:
3328 ShouldNotReachHere();
3329 }
3330
3331 DWORD old_status;
3332
3333 // Strange enough, but on Win32 one can change protection only for committed
3334 // memory, not a big deal anyway, as bytes less or equal than 64K
3335 if (!is_committed) {
3336 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3337 "cannot commit protection page");
3338 }
3339 // One cannot use os::guard_memory() here, as on Win32 guard page
3340 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3341 //
3342 // Pages in the region become guard pages. Any attempt to access a guard page
3343 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3344 // the guard page status. Guard pages thus act as a one-time access alarm.
3345 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3346 }
3347
3348 bool os::guard_memory(char* addr, size_t bytes) {
3349 DWORD old_status;
3350 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3351 }
3352
3353 bool os::unguard_memory(char* addr, size_t bytes) {
3354 DWORD old_status;
3355 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3356 }
3357
3358 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3359 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3360 void os::numa_make_global(char *addr, size_t bytes) { }
3361 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3362 bool os::numa_topology_changed() { return false; }
3363 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3364 int os::numa_get_group_id() { return 0; }
3365 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3366 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3367 // Provide an answer for UMA systems
3368 ids[0] = 0;
3369 return 1;
3370 } else {
3371 // check for size bigger than actual groups_num
3372 size = MIN2(size, numa_get_groups_num());
3373 for (int i = 0; i < (int)size; i++) {
3374 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3375 }
3376 return size;
3377 }
3378 }
3379
3380 bool os::get_page_info(char *start, page_info* info) {
3381 return false;
3382 }
3383
3384 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3385 page_info* page_found) {
3386 return end;
3387 }
3388
3389 char* os::non_memory_address_word() {
3390 // Must never look like an address returned by reserve_memory,
3391 // even in its subfields (as defined by the CPU immediate fields,
3392 // if the CPU splits constants across multiple instructions).
3393 return (char*)-1;
3394 }
3395
3396 #define MAX_ERROR_COUNT 100
3397 #define SYS_THREAD_ERROR 0xffffffffUL
3398
3399 void os::pd_start_thread(Thread* thread) {
3400 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3401 // Returns previous suspend state:
3402 // 0: Thread was not suspended
3403 // 1: Thread is running now
3404 // >1: Thread is still suspended.
3405 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3406 }
3407
3408 class HighResolutionInterval : public CHeapObj<mtThread> {
3409 // The default timer resolution seems to be 10 milliseconds.
3410 // (Where is this written down?)
3411 // If someone wants to sleep for only a fraction of the default,
3412 // then we set the timer resolution down to 1 millisecond for
3413 // the duration of their interval.
3414 // We carefully set the resolution back, since otherwise we
3415 // seem to incur an overhead (3%?) that we don't need.
3416 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3417 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3418 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3419 // timeBeginPeriod() if the relative error exceeded some threshold.
3420 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3421 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3422 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3423 // resolution timers running.
3424 private:
3425 jlong resolution;
3426 public:
3427 HighResolutionInterval(jlong ms) {
3428 resolution = ms % 10L;
3429 if (resolution != 0) {
3430 MMRESULT result = timeBeginPeriod(1L);
3431 }
3432 }
3433 ~HighResolutionInterval() {
3434 if (resolution != 0) {
3435 MMRESULT result = timeEndPeriod(1L);
3436 }
3437 resolution = 0L;
3438 }
3439 };
3440
3441 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3442 jlong limit = (jlong) MAXDWORD;
3443
3444 while (ms > limit) {
3445 int res;
3446 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3447 return res;
3448 }
3449 ms -= limit;
3450 }
3451
3452 assert(thread == Thread::current(), "thread consistency check");
3453 OSThread* osthread = thread->osthread();
3454 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3455 int result;
3456 if (interruptable) {
3457 assert(thread->is_Java_thread(), "must be java thread");
3458 JavaThread *jt = (JavaThread *) thread;
3459 ThreadBlockInVM tbivm(jt);
3460
3461 jt->set_suspend_equivalent();
3462 // cleared by handle_special_suspend_equivalent_condition() or
3463 // java_suspend_self() via check_and_wait_while_suspended()
3464
3465 HANDLE events[1];
3466 events[0] = osthread->interrupt_event();
3467 HighResolutionInterval *phri=NULL;
3468 if (!ForceTimeHighResolution) {
3469 phri = new HighResolutionInterval(ms);
3470 }
3471 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3472 result = OS_TIMEOUT;
3473 } else {
3474 ResetEvent(osthread->interrupt_event());
3475 osthread->set_interrupted(false);
3476 result = OS_INTRPT;
3477 }
3478 delete phri; //if it is NULL, harmless
3479
3480 // were we externally suspended while we were waiting?
3481 jt->check_and_wait_while_suspended();
3482 } else {
3483 assert(!thread->is_Java_thread(), "must not be java thread");
3484 Sleep((long) ms);
3485 result = OS_TIMEOUT;
3486 }
3487 return result;
3488 }
3489
3490 // Short sleep, direct OS call.
3491 //
3492 // ms = 0, means allow others (if any) to run.
3493 //
3494 void os::naked_short_sleep(jlong ms) {
3495 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3496 Sleep(ms);
3497 }
3498
3499 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3500 void os::infinite_sleep() {
3501 while (true) { // sleep forever ...
3502 Sleep(100000); // ... 100 seconds at a time
3503 }
3504 }
3505
3506 typedef BOOL (WINAPI * STTSignature)(void);
3507
3508 void os::naked_yield() {
3509 // Use either SwitchToThread() or Sleep(0)
3510 // Consider passing back the return value from SwitchToThread().
3511 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3512 SwitchToThread();
3513 } else {
3514 Sleep(0);
3515 }
3516 }
3517
3518 // Win32 only gives you access to seven real priorities at a time,
3519 // so we compress Java's ten down to seven. It would be better
3520 // if we dynamically adjusted relative priorities.
3521
3522 int os::java_to_os_priority[CriticalPriority + 1] = {
3523 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3524 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3525 THREAD_PRIORITY_LOWEST, // 2
3526 THREAD_PRIORITY_BELOW_NORMAL, // 3
3527 THREAD_PRIORITY_BELOW_NORMAL, // 4
3528 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3529 THREAD_PRIORITY_NORMAL, // 6
3530 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3531 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3532 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3533 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3534 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3535 };
3536
3537 int prio_policy1[CriticalPriority + 1] = {
3538 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3539 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3540 THREAD_PRIORITY_LOWEST, // 2
3541 THREAD_PRIORITY_BELOW_NORMAL, // 3
3542 THREAD_PRIORITY_BELOW_NORMAL, // 4
3543 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3544 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3545 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3546 THREAD_PRIORITY_HIGHEST, // 8
3547 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3548 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3549 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3550 };
3551
3552 static int prio_init() {
3553 // If ThreadPriorityPolicy is 1, switch tables
3554 if (ThreadPriorityPolicy == 1) {
3555 int i;
3556 for (i = 0; i < CriticalPriority + 1; i++) {
3557 os::java_to_os_priority[i] = prio_policy1[i];
3558 }
3559 }
3560 if (UseCriticalJavaThreadPriority) {
3561 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3562 }
3563 return 0;
3564 }
3565
3566 OSReturn os::set_native_priority(Thread* thread, int priority) {
3567 if (!UseThreadPriorities) return OS_OK;
3568 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3569 return ret ? OS_OK : OS_ERR;
3570 }
3571
3572 OSReturn os::get_native_priority(const Thread* const thread,
3573 int* priority_ptr) {
3574 if (!UseThreadPriorities) {
3575 *priority_ptr = java_to_os_priority[NormPriority];
3576 return OS_OK;
3577 }
3578 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3579 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3580 assert(false, "GetThreadPriority failed");
3581 return OS_ERR;
3582 }
3583 *priority_ptr = os_prio;
3584 return OS_OK;
3585 }
3586
3587
3588 // Hint to the underlying OS that a task switch would not be good.
3589 // Void return because it's a hint and can fail.
3590 void os::hint_no_preempt() {}
3591
3592 void os::interrupt(Thread* thread) {
3593 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3594 Threads_lock->owned_by_self(),
3595 "possibility of dangling Thread pointer");
3596
3597 OSThread* osthread = thread->osthread();
3598 osthread->set_interrupted(true);
3599 // More than one thread can get here with the same value of osthread,
3600 // resulting in multiple notifications. We do, however, want the store
3601 // to interrupted() to be visible to other threads before we post
3602 // the interrupt event.
3603 OrderAccess::release();
3604 SetEvent(osthread->interrupt_event());
3605 // For JSR166: unpark after setting status
3606 if (thread->is_Java_thread()) {
3607 ((JavaThread*)thread)->parker()->unpark();
3608 }
3609
3610 ParkEvent * ev = thread->_ParkEvent;
3611 if (ev != NULL) ev->unpark();
3612 }
3613
3614
3615 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3616 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3617 "possibility of dangling Thread pointer");
3618
3619 OSThread* osthread = thread->osthread();
3620 // There is no synchronization between the setting of the interrupt
3621 // and it being cleared here. It is critical - see 6535709 - that
3622 // we only clear the interrupt state, and reset the interrupt event,
3623 // if we are going to report that we were indeed interrupted - else
3624 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3625 // depending on the timing. By checking thread interrupt event to see
3626 // if the thread gets real interrupt thus prevent spurious wakeup.
3627 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3628 if (interrupted && clear_interrupted) {
3629 osthread->set_interrupted(false);
3630 ResetEvent(osthread->interrupt_event());
3631 } // Otherwise leave the interrupted state alone
3632
3633 return interrupted;
3634 }
3635
3636 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3637 ExtendedPC os::get_thread_pc(Thread* thread) {
3638 CONTEXT context;
3639 context.ContextFlags = CONTEXT_CONTROL;
3640 HANDLE handle = thread->osthread()->thread_handle();
3641 #ifdef _M_IA64
3642 assert(0, "Fix get_thread_pc");
3643 return ExtendedPC(NULL);
3644 #else
3645 if (GetThreadContext(handle, &context)) {
3646 #ifdef _M_AMD64
3647 return ExtendedPC((address) context.Rip);
3648 #else
3649 return ExtendedPC((address) context.Eip);
3650 #endif
3651 } else {
3652 return ExtendedPC(NULL);
3653 }
3654 #endif
3655 }
3656
3657 // GetCurrentThreadId() returns DWORD
3658 intx os::current_thread_id() { return GetCurrentThreadId(); }
3659
3660 static int _initial_pid = 0;
3661
3662 int os::current_process_id() {
3663 return (_initial_pid ? _initial_pid : _getpid());
3664 }
3665
3666 int os::win32::_vm_page_size = 0;
3667 int os::win32::_vm_allocation_granularity = 0;
3668 int os::win32::_processor_type = 0;
3669 // Processor level is not available on non-NT systems, use vm_version instead
3670 int os::win32::_processor_level = 0;
3671 julong os::win32::_physical_memory = 0;
3672 size_t os::win32::_default_stack_size = 0;
3673
3674 intx os::win32::_os_thread_limit = 0;
3675 volatile intx os::win32::_os_thread_count = 0;
3676
3677 bool os::win32::_is_nt = false;
3678 bool os::win32::_is_windows_2003 = false;
3679 bool os::win32::_is_windows_server = false;
3680
3681 // 6573254
3682 // Currently, the bug is observed across all the supported Windows releases,
3683 // including the latest one (as of this writing - Windows Server 2012 R2)
3684 bool os::win32::_has_exit_bug = true;
3685 bool os::win32::_has_performance_count = 0;
3686
3687 void os::win32::initialize_system_info() {
3688 SYSTEM_INFO si;
3689 GetSystemInfo(&si);
3690 _vm_page_size = si.dwPageSize;
3691 _vm_allocation_granularity = si.dwAllocationGranularity;
3692 _processor_type = si.dwProcessorType;
3693 _processor_level = si.wProcessorLevel;
3694 set_processor_count(si.dwNumberOfProcessors);
3695
3696 MEMORYSTATUSEX ms;
3697 ms.dwLength = sizeof(ms);
3698
3699 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3700 // dwMemoryLoad (% of memory in use)
3701 GlobalMemoryStatusEx(&ms);
3702 _physical_memory = ms.ullTotalPhys;
3703
3704 OSVERSIONINFOEX oi;
3705 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3706 GetVersionEx((OSVERSIONINFO*)&oi);
3707 switch (oi.dwPlatformId) {
3708 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3709 case VER_PLATFORM_WIN32_NT:
3710 _is_nt = true;
3711 {
3712 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3713 if (os_vers == 5002) {
3714 _is_windows_2003 = true;
3715 }
3716 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3717 oi.wProductType == VER_NT_SERVER) {
3718 _is_windows_server = true;
3719 }
3720 }
3721 break;
3722 default: fatal("Unknown platform");
3723 }
3724
3725 _default_stack_size = os::current_stack_size();
3726 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3727 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3728 "stack size not a multiple of page size");
3729
3730 initialize_performance_counter();
3731
3732 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3733 // known to deadlock the system, if the VM issues to thread operations with
3734 // a too high frequency, e.g., such as changing the priorities.
3735 // The 6000 seems to work well - no deadlocks has been notices on the test
3736 // programs that we have seen experience this problem.
3737 if (!os::win32::is_nt()) {
3738 StarvationMonitorInterval = 6000;
3739 }
3740 }
3741
3742
3743 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3744 int ebuflen) {
3745 char path[MAX_PATH];
3746 DWORD size;
3747 DWORD pathLen = (DWORD)sizeof(path);
3748 HINSTANCE result = NULL;
3749
3750 // only allow library name without path component
3751 assert(strchr(name, '\\') == NULL, "path not allowed");
3752 assert(strchr(name, ':') == NULL, "path not allowed");
3753 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3754 jio_snprintf(ebuf, ebuflen,
3755 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3756 return NULL;
3757 }
3758
3759 // search system directory
3760 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3761 if (size >= pathLen) {
3762 return NULL; // truncated
3763 }
3764 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3765 return NULL; // truncated
3766 }
3767 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3768 return result;
3769 }
3770 }
3771
3772 // try Windows directory
3773 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3774 if (size >= pathLen) {
3775 return NULL; // truncated
3776 }
3777 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3778 return NULL; // truncated
3779 }
3780 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3781 return result;
3782 }
3783 }
3784
3785 jio_snprintf(ebuf, ebuflen,
3786 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3787 return NULL;
3788 }
3789
3790 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */
3791
3792 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3793 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3794 return TRUE;
3795 }
3796
3797 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3798 // Basic approach:
3799 // - Each exiting thread registers its intent to exit and then does so.
3800 // - A thread trying to terminate the process must wait for all
3801 // threads currently exiting to complete their exit.
3802
3803 if (os::win32::has_exit_bug()) {
3804 // The array holds handles of the threads that have started exiting by calling
3805 // _endthreadex().
3806 // Should be large enough to avoid blocking the exiting thread due to lack of
3807 // a free slot.
3808 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3809 static int handle_count = 0;
3810
3811 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3812 static CRITICAL_SECTION crit_sect;
3813 static volatile jint process_exiting = 0;
3814 int i, j;
3815 DWORD res;
3816 HANDLE hproc, hthr;
3817
3818 // The first thread that reached this point, initializes the critical section.
3819 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3820 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3821 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3822 EnterCriticalSection(&crit_sect);
3823
3824 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3825 // Remove from the array those handles of the threads that have completed exiting.
3826 for (i = 0, j = 0; i < handle_count; ++i) {
3827 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3828 if (res == WAIT_TIMEOUT) {
3829 handles[j++] = handles[i];
3830 } else {
3831 if (res == WAIT_FAILED) {
3832 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3833 GetLastError(), __FILE__, __LINE__);
3834 }
3835 // Don't keep the handle, if we failed waiting for it.
3836 CloseHandle(handles[i]);
3837 }
3838 }
3839
3840 // If there's no free slot in the array of the kept handles, we'll have to
3841 // wait until at least one thread completes exiting.
3842 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3843 // Raise the priority of the oldest exiting thread to increase its chances
3844 // to complete sooner.
3845 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3846 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3847 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3848 i = (res - WAIT_OBJECT_0);
3849 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3850 for (; i < handle_count; ++i) {
3851 handles[i] = handles[i + 1];
3852 }
3853 } else {
3854 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3855 (res == WAIT_FAILED ? "failed" : "timed out"),
3856 GetLastError(), __FILE__, __LINE__);
3857 // Don't keep handles, if we failed waiting for them.
3858 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3859 CloseHandle(handles[i]);
3860 }
3861 handle_count = 0;
3862 }
3863 }
3864
3865 // Store a duplicate of the current thread handle in the array of handles.
3866 hproc = GetCurrentProcess();
3867 hthr = GetCurrentThread();
3868 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3869 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3870 warning("DuplicateHandle failed (%u) in %s: %d\n",
3871 GetLastError(), __FILE__, __LINE__);
3872 } else {
3873 ++handle_count;
3874 }
3875
3876 // The current exiting thread has stored its handle in the array, and now
3877 // should leave the critical section before calling _endthreadex().
3878
3879 } else if (what != EPT_THREAD) {
3880 if (handle_count > 0) {
3881 // Before ending the process, make sure all the threads that had called
3882 // _endthreadex() completed.
3883
3884 // Set the priority level of the current thread to the same value as
3885 // the priority level of exiting threads.
3886 // This is to ensure it will be given a fair chance to execute if
3887 // the timeout expires.
3888 hthr = GetCurrentThread();
3889 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3890 for (i = 0; i < handle_count; ++i) {
3891 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3892 }
3893 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3894 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3895 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3896 (res == WAIT_FAILED ? "failed" : "timed out"),
3897 GetLastError(), __FILE__, __LINE__);
3898 }
3899 for (i = 0; i < handle_count; ++i) {
3900 CloseHandle(handles[i]);
3901 }
3902 handle_count = 0;
3903 }
3904
3905 OrderAccess::release_store(&process_exiting, 1);
3906 }
3907
3908 LeaveCriticalSection(&crit_sect);
3909 }
3910
3911 if (what == EPT_THREAD) {
3912 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3913 // Some other thread is about to call exit(), so we
3914 // don't let the current thread proceed to _endthreadex()
3915 SuspendThread(GetCurrentThread());
3916 // Avoid busy-wait loop, if SuspendThread() failed.
3917 Sleep(EXIT_TIMEOUT);
3918 }
3919 }
3920 }
3921
3922 // We are here if either
3923 // - there's no 'race at exit' bug on this OS release;
3924 // - initialization of the critical section failed (unlikely);
3925 // - the current thread has stored its handle and left the critical section;
3926 // - the process-exiting thread has raised the flag and left the critical section.
3927 if (what == EPT_THREAD) {
3928 _endthreadex((unsigned)exit_code);
3929 } else if (what == EPT_PROCESS) {
3930 ::exit(exit_code);
3931 } else {
3932 _exit(exit_code);
3933 }
3934
3935 // Should not reach here
3936 return exit_code;
3937 }
3938
3939 #undef EXIT_TIMEOUT
3940
3941 void os::win32::setmode_streams() {
3942 _setmode(_fileno(stdin), _O_BINARY);
3943 _setmode(_fileno(stdout), _O_BINARY);
3944 _setmode(_fileno(stderr), _O_BINARY);
3945 }
3946
3947
3948 bool os::is_debugger_attached() {
3949 return IsDebuggerPresent() ? true : false;
3950 }
3951
3952
3953 void os::wait_for_keypress_at_exit(void) {
3954 if (PauseAtExit) {
3955 fprintf(stderr, "Press any key to continue...\n");
3956 fgetc(stdin);
3957 }
3958 }
3959
3960
3961 int os::message_box(const char* title, const char* message) {
3962 int result = MessageBox(NULL, message, title,
3963 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3964 return result == IDYES;
3965 }
3966
3967 int os::allocate_thread_local_storage() {
3968 return TlsAlloc();
3969 }
3970
3971
3972 void os::free_thread_local_storage(int index) {
3973 TlsFree(index);
3974 }
3975
3976
3977 void os::thread_local_storage_at_put(int index, void* value) {
3978 TlsSetValue(index, value);
3979 assert(thread_local_storage_at(index) == value, "Just checking");
3980 }
3981
3982
3983 void* os::thread_local_storage_at(int index) {
3984 return TlsGetValue(index);
3985 }
3986
3987
3988 #ifndef PRODUCT
3989 #ifndef _WIN64
3990 // Helpers to check whether NX protection is enabled
3991 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3992 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3993 pex->ExceptionRecord->NumberParameters > 0 &&
3994 pex->ExceptionRecord->ExceptionInformation[0] ==
3995 EXCEPTION_INFO_EXEC_VIOLATION) {
3996 return EXCEPTION_EXECUTE_HANDLER;
3997 }
3998 return EXCEPTION_CONTINUE_SEARCH;
3999 }
4000
4001 void nx_check_protection() {
4002 // If NX is enabled we'll get an exception calling into code on the stack
4003 char code[] = { (char)0xC3 }; // ret
4004 void *code_ptr = (void *)code;
4005 __try {
4006 __asm call code_ptr
4007 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4008 tty->print_raw_cr("NX protection detected.");
4009 }
4010 }
4011 #endif // _WIN64
4012 #endif // PRODUCT
4013
4014 // this is called _before_ the global arguments have been parsed
4015 void os::init(void) {
4016 _initial_pid = _getpid();
4017
4018 init_random(1234567);
4019
4020 win32::initialize_system_info();
4021 win32::setmode_streams();
4022 init_page_sizes((size_t) win32::vm_page_size());
4023
4024 // This may be overridden later when argument processing is done.
4025 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4026 os::win32::is_windows_2003());
4027
4028 // Initialize main_process and main_thread
4029 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4030 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4031 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4032 fatal("DuplicateHandle failed\n");
4033 }
4034 main_thread_id = (int) GetCurrentThreadId();
4035 }
4036
4037 // To install functions for atexit processing
4038 extern "C" {
4039 static void perfMemory_exit_helper() {
4040 perfMemory_exit();
4041 }
4042 }
4043
4044 static jint initSock();
4045
4046 // this is called _after_ the global arguments have been parsed
4047 jint os::init_2(void) {
4048 // Allocate a single page and mark it as readable for safepoint polling
4049 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4050 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4051
4052 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4053 guarantee(return_page != NULL, "Commit Failed for polling page");
4054
4055 os::set_polling_page(polling_page);
4056
4057 #ifndef PRODUCT
4058 if (Verbose && PrintMiscellaneous) {
4059 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4060 (intptr_t)polling_page);
4061 }
4062 #endif
4063
4064 if (!UseMembar) {
4065 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4066 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4067
4068 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4069 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4070
4071 os::set_memory_serialize_page(mem_serialize_page);
4072
4073 #ifndef PRODUCT
4074 if (Verbose && PrintMiscellaneous) {
4075 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4076 (intptr_t)mem_serialize_page);
4077 }
4078 #endif
4079 }
4080
4081 // Setup Windows Exceptions
4082
4083 // for debugging float code generation bugs
4084 if (ForceFloatExceptions) {
4085 #ifndef _WIN64
4086 static long fp_control_word = 0;
4087 __asm { fstcw fp_control_word }
4088 // see Intel PPro Manual, Vol. 2, p 7-16
4089 const long precision = 0x20;
4090 const long underflow = 0x10;
4091 const long overflow = 0x08;
4092 const long zero_div = 0x04;
4093 const long denorm = 0x02;
4094 const long invalid = 0x01;
4095 fp_control_word |= invalid;
4096 __asm { fldcw fp_control_word }
4097 #endif
4098 }
4099
4100 // If stack_commit_size is 0, windows will reserve the default size,
4101 // but only commit a small portion of it.
4102 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4103 size_t default_reserve_size = os::win32::default_stack_size();
4104 size_t actual_reserve_size = stack_commit_size;
4105 if (stack_commit_size < default_reserve_size) {
4106 // If stack_commit_size == 0, we want this too
4107 actual_reserve_size = default_reserve_size;
4108 }
4109
4110 // Check minimum allowable stack size for thread creation and to initialize
4111 // the java system classes, including StackOverflowError - depends on page
4112 // size. Add a page for compiler2 recursion in main thread.
4113 // Add in 2*BytesPerWord times page size to account for VM stack during
4114 // class initialization depending on 32 or 64 bit VM.
4115 size_t min_stack_allowed =
4116 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4117 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4118 if (actual_reserve_size < min_stack_allowed) {
4119 tty->print_cr("\nThe stack size specified is too small, "
4120 "Specify at least %dk",
4121 min_stack_allowed / K);
4122 return JNI_ERR;
4123 }
4124
4125 JavaThread::set_stack_size_at_create(stack_commit_size);
4126
4127 // Calculate theoretical max. size of Threads to guard gainst artifical
4128 // out-of-memory situations, where all available address-space has been
4129 // reserved by thread stacks.
4130 assert(actual_reserve_size != 0, "Must have a stack");
4131
4132 // Calculate the thread limit when we should start doing Virtual Memory
4133 // banging. Currently when the threads will have used all but 200Mb of space.
4134 //
4135 // TODO: consider performing a similar calculation for commit size instead
4136 // as reserve size, since on a 64-bit platform we'll run into that more
4137 // often than running out of virtual memory space. We can use the
4138 // lower value of the two calculations as the os_thread_limit.
4139 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4140 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4141
4142 // at exit methods are called in the reverse order of their registration.
4143 // there is no limit to the number of functions registered. atexit does
4144 // not set errno.
4145
4146 if (PerfAllowAtExitRegistration) {
4147 // only register atexit functions if PerfAllowAtExitRegistration is set.
4148 // atexit functions can be delayed until process exit time, which
4149 // can be problematic for embedded VM situations. Embedded VMs should
4150 // call DestroyJavaVM() to assure that VM resources are released.
4151
4152 // note: perfMemory_exit_helper atexit function may be removed in
4153 // the future if the appropriate cleanup code can be added to the
4154 // VM_Exit VMOperation's doit method.
4155 if (atexit(perfMemory_exit_helper) != 0) {
4156 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4157 }
4158 }
4159
4160 #ifndef _WIN64
4161 // Print something if NX is enabled (win32 on AMD64)
4162 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4163 #endif
4164
4165 // initialize thread priority policy
4166 prio_init();
4167
4168 if (UseNUMA && !ForceNUMA) {
4169 UseNUMA = false; // We don't fully support this yet
4170 }
4171
4172 if (UseNUMAInterleaving) {
4173 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4174 bool success = numa_interleaving_init();
4175 if (!success) UseNUMAInterleaving = false;
4176 }
4177
4178 if (initSock() != JNI_OK) {
4179 return JNI_ERR;
4180 }
4181
4182 return JNI_OK;
4183 }
4184
4185 // Mark the polling page as unreadable
4186 void os::make_polling_page_unreadable(void) {
4187 DWORD old_status;
4188 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4189 PAGE_NOACCESS, &old_status)) {
4190 fatal("Could not disable polling page");
4191 }
4192 }
4193
4194 // Mark the polling page as readable
4195 void os::make_polling_page_readable(void) {
4196 DWORD old_status;
4197 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4198 PAGE_READONLY, &old_status)) {
4199 fatal("Could not enable polling page");
4200 }
4201 }
4202
4203
4204 int os::stat(const char *path, struct stat *sbuf) {
4205 char pathbuf[MAX_PATH];
4206 if (strlen(path) > MAX_PATH - 1) {
4207 errno = ENAMETOOLONG;
4208 return -1;
4209 }
4210 os::native_path(strcpy(pathbuf, path));
4211 int ret = ::stat(pathbuf, sbuf);
4212 if (sbuf != NULL && UseUTCFileTimestamp) {
4213 // Fix for 6539723. st_mtime returned from stat() is dependent on
4214 // the system timezone and so can return different values for the
4215 // same file if/when daylight savings time changes. This adjustment
4216 // makes sure the same timestamp is returned regardless of the TZ.
4217 //
4218 // See:
4219 // http://msdn.microsoft.com/library/
4220 // default.asp?url=/library/en-us/sysinfo/base/
4221 // time_zone_information_str.asp
4222 // and
4223 // http://msdn.microsoft.com/library/default.asp?url=
4224 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4225 //
4226 // NOTE: there is a insidious bug here: If the timezone is changed
4227 // after the call to stat() but before 'GetTimeZoneInformation()', then
4228 // the adjustment we do here will be wrong and we'll return the wrong
4229 // value (which will likely end up creating an invalid class data
4230 // archive). Absent a better API for this, or some time zone locking
4231 // mechanism, we'll have to live with this risk.
4232 TIME_ZONE_INFORMATION tz;
4233 DWORD tzid = GetTimeZoneInformation(&tz);
4234 int daylightBias =
4235 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4236 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4237 }
4238 return ret;
4239 }
4240
4241
4242 #define FT2INT64(ft) \
4243 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4244
4245
4246 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4247 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4248 // of a thread.
4249 //
4250 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4251 // the fast estimate available on the platform.
4252
4253 // current_thread_cpu_time() is not optimized for Windows yet
4254 jlong os::current_thread_cpu_time() {
4255 // return user + sys since the cost is the same
4256 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4257 }
4258
4259 jlong os::thread_cpu_time(Thread* thread) {
4260 // consistent with what current_thread_cpu_time() returns.
4261 return os::thread_cpu_time(thread, true /* user+sys */);
4262 }
4263
4264 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4265 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4266 }
4267
4268 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4269 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4270 // If this function changes, os::is_thread_cpu_time_supported() should too
4271 if (os::win32::is_nt()) {
4272 FILETIME CreationTime;
4273 FILETIME ExitTime;
4274 FILETIME KernelTime;
4275 FILETIME UserTime;
4276
4277 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4278 &ExitTime, &KernelTime, &UserTime) == 0) {
4279 return -1;
4280 } else if (user_sys_cpu_time) {
4281 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4282 } else {
4283 return FT2INT64(UserTime) * 100;
4284 }
4285 } else {
4286 return (jlong) timeGetTime() * 1000000;
4287 }
4288 }
4289
4290 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4291 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4292 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4293 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4294 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4295 }
4296
4297 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4298 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4299 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4300 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4301 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4302 }
4303
4304 bool os::is_thread_cpu_time_supported() {
4305 // see os::thread_cpu_time
4306 if (os::win32::is_nt()) {
4307 FILETIME CreationTime;
4308 FILETIME ExitTime;
4309 FILETIME KernelTime;
4310 FILETIME UserTime;
4311
4312 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4313 &KernelTime, &UserTime) == 0) {
4314 return false;
4315 } else {
4316 return true;
4317 }
4318 } else {
4319 return false;
4320 }
4321 }
4322
4323 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4324 // It does have primitives (PDH API) to get CPU usage and run queue length.
4325 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4326 // If we wanted to implement loadavg on Windows, we have a few options:
4327 //
4328 // a) Query CPU usage and run queue length and "fake" an answer by
4329 // returning the CPU usage if it's under 100%, and the run queue
4330 // length otherwise. It turns out that querying is pretty slow
4331 // on Windows, on the order of 200 microseconds on a fast machine.
4332 // Note that on the Windows the CPU usage value is the % usage
4333 // since the last time the API was called (and the first call
4334 // returns 100%), so we'd have to deal with that as well.
4335 //
4336 // b) Sample the "fake" answer using a sampling thread and store
4337 // the answer in a global variable. The call to loadavg would
4338 // just return the value of the global, avoiding the slow query.
4339 //
4340 // c) Sample a better answer using exponential decay to smooth the
4341 // value. This is basically the algorithm used by UNIX kernels.
4342 //
4343 // Note that sampling thread starvation could affect both (b) and (c).
4344 int os::loadavg(double loadavg[], int nelem) {
4345 return -1;
4346 }
4347
4348
4349 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4350 bool os::dont_yield() {
4351 return DontYieldALot;
4352 }
4353
4354 // This method is a slightly reworked copy of JDK's sysOpen
4355 // from src/windows/hpi/src/sys_api_md.c
4356
4357 int os::open(const char *path, int oflag, int mode) {
4358 char pathbuf[MAX_PATH];
4359
4360 if (strlen(path) > MAX_PATH - 1) {
4361 errno = ENAMETOOLONG;
4362 return -1;
4363 }
4364 os::native_path(strcpy(pathbuf, path));
4365 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4366 }
4367
4368 FILE* os::open(int fd, const char* mode) {
4369 return ::_fdopen(fd, mode);
4370 }
4371
4372 // Is a (classpath) directory empty?
4373 bool os::dir_is_empty(const char* path) {
4374 WIN32_FIND_DATA fd;
4375 HANDLE f = FindFirstFile(path, &fd);
4376 if (f == INVALID_HANDLE_VALUE) {
4377 return true;
4378 }
4379 FindClose(f);
4380 return false;
4381 }
4382
4383 // create binary file, rewriting existing file if required
4384 int os::create_binary_file(const char* path, bool rewrite_existing) {
4385 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4386 if (!rewrite_existing) {
4387 oflags |= _O_EXCL;
4388 }
4389 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4390 }
4391
4392 // return current position of file pointer
4393 jlong os::current_file_offset(int fd) {
4394 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4395 }
4396
4397 // move file pointer to the specified offset
4398 jlong os::seek_to_file_offset(int fd, jlong offset) {
4399 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4400 }
4401
4402
4403 jlong os::lseek(int fd, jlong offset, int whence) {
4404 return (jlong) ::_lseeki64(fd, offset, whence);
4405 }
4406
4407 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4408 OVERLAPPED ov;
4409 DWORD nread;
4410 BOOL result;
4411
4412 ZeroMemory(&ov, sizeof(ov));
4413 ov.Offset = (DWORD)offset;
4414 ov.OffsetHigh = (DWORD)(offset >> 32);
4415
4416 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4417
4418 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4419
4420 return result ? nread : 0;
4421 }
4422
4423
4424 // This method is a slightly reworked copy of JDK's sysNativePath
4425 // from src/windows/hpi/src/path_md.c
4426
4427 // Convert a pathname to native format. On win32, this involves forcing all
4428 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4429 // sometimes rejects '/') and removing redundant separators. The input path is
4430 // assumed to have been converted into the character encoding used by the local
4431 // system. Because this might be a double-byte encoding, care is taken to
4432 // treat double-byte lead characters correctly.
4433 //
4434 // This procedure modifies the given path in place, as the result is never
4435 // longer than the original. There is no error return; this operation always
4436 // succeeds.
4437 char * os::native_path(char *path) {
4438 char *src = path, *dst = path, *end = path;
4439 char *colon = NULL; // If a drive specifier is found, this will
4440 // point to the colon following the drive letter
4441
4442 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4443 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4444 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4445
4446 // Check for leading separators
4447 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4448 while (isfilesep(*src)) {
4449 src++;
4450 }
4451
4452 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4453 // Remove leading separators if followed by drive specifier. This
4454 // hack is necessary to support file URLs containing drive
4455 // specifiers (e.g., "file://c:/path"). As a side effect,
4456 // "/c:/path" can be used as an alternative to "c:/path".
4457 *dst++ = *src++;
4458 colon = dst;
4459 *dst++ = ':';
4460 src++;
4461 } else {
4462 src = path;
4463 if (isfilesep(src[0]) && isfilesep(src[1])) {
4464 // UNC pathname: Retain first separator; leave src pointed at
4465 // second separator so that further separators will be collapsed
4466 // into the second separator. The result will be a pathname
4467 // beginning with "\\\\" followed (most likely) by a host name.
4468 src = dst = path + 1;
4469 path[0] = '\\'; // Force first separator to '\\'
4470 }
4471 }
4472
4473 end = dst;
4474
4475 // Remove redundant separators from remainder of path, forcing all
4476 // separators to be '\\' rather than '/'. Also, single byte space
4477 // characters are removed from the end of the path because those
4478 // are not legal ending characters on this operating system.
4479 //
4480 while (*src != '\0') {
4481 if (isfilesep(*src)) {
4482 *dst++ = '\\'; src++;
4483 while (isfilesep(*src)) src++;
4484 if (*src == '\0') {
4485 // Check for trailing separator
4486 end = dst;
4487 if (colon == dst - 2) break; // "z:\\"
4488 if (dst == path + 1) break; // "\\"
4489 if (dst == path + 2 && isfilesep(path[0])) {
4490 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4491 // beginning of a UNC pathname. Even though it is not, by
4492 // itself, a valid UNC pathname, we leave it as is in order
4493 // to be consistent with the path canonicalizer as well
4494 // as the win32 APIs, which treat this case as an invalid
4495 // UNC pathname rather than as an alias for the root
4496 // directory of the current drive.
4497 break;
4498 }
4499 end = --dst; // Path does not denote a root directory, so
4500 // remove trailing separator
4501 break;
4502 }
4503 end = dst;
4504 } else {
4505 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4506 *dst++ = *src++;
4507 if (*src) *dst++ = *src++;
4508 end = dst;
4509 } else { // Copy a single-byte character
4510 char c = *src++;
4511 *dst++ = c;
4512 // Space is not a legal ending character
4513 if (c != ' ') end = dst;
4514 }
4515 }
4516 }
4517
4518 *end = '\0';
4519
4520 // For "z:", add "." to work around a bug in the C runtime library
4521 if (colon == dst - 1) {
4522 path[2] = '.';
4523 path[3] = '\0';
4524 }
4525
4526 return path;
4527 }
4528
4529 // This code is a copy of JDK's sysSetLength
4530 // from src/windows/hpi/src/sys_api_md.c
4531
4532 int os::ftruncate(int fd, jlong length) {
4533 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4534 long high = (long)(length >> 32);
4535 DWORD ret;
4536
4537 if (h == (HANDLE)(-1)) {
4538 return -1;
4539 }
4540
4541 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4542 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4543 return -1;
4544 }
4545
4546 if (::SetEndOfFile(h) == FALSE) {
4547 return -1;
4548 }
4549
4550 return 0;
4551 }
4552
4553
4554 // This code is a copy of JDK's sysSync
4555 // from src/windows/hpi/src/sys_api_md.c
4556 // except for the legacy workaround for a bug in Win 98
4557
4558 int os::fsync(int fd) {
4559 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4560
4561 if ((!::FlushFileBuffers(handle)) &&
4562 (GetLastError() != ERROR_ACCESS_DENIED)) {
4563 // from winerror.h
4564 return -1;
4565 }
4566 return 0;
4567 }
4568
4569 static int nonSeekAvailable(int, long *);
4570 static int stdinAvailable(int, long *);
4571
4572 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4573 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4574
4575 // This code is a copy of JDK's sysAvailable
4576 // from src/windows/hpi/src/sys_api_md.c
4577
4578 int os::available(int fd, jlong *bytes) {
4579 jlong cur, end;
4580 struct _stati64 stbuf64;
4581
4582 if (::_fstati64(fd, &stbuf64) >= 0) {
4583 int mode = stbuf64.st_mode;
4584 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4585 int ret;
4586 long lpbytes;
4587 if (fd == 0) {
4588 ret = stdinAvailable(fd, &lpbytes);
4589 } else {
4590 ret = nonSeekAvailable(fd, &lpbytes);
4591 }
4592 (*bytes) = (jlong)(lpbytes);
4593 return ret;
4594 }
4595 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4596 return FALSE;
4597 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4598 return FALSE;
4599 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4600 return FALSE;
4601 }
4602 *bytes = end - cur;
4603 return TRUE;
4604 } else {
4605 return FALSE;
4606 }
4607 }
4608
4609 // This code is a copy of JDK's nonSeekAvailable
4610 // from src/windows/hpi/src/sys_api_md.c
4611
4612 static int nonSeekAvailable(int fd, long *pbytes) {
4613 // This is used for available on non-seekable devices
4614 // (like both named and anonymous pipes, such as pipes
4615 // connected to an exec'd process).
4616 // Standard Input is a special case.
4617 HANDLE han;
4618
4619 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4620 return FALSE;
4621 }
4622
4623 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4624 // PeekNamedPipe fails when at EOF. In that case we
4625 // simply make *pbytes = 0 which is consistent with the
4626 // behavior we get on Solaris when an fd is at EOF.
4627 // The only alternative is to raise an Exception,
4628 // which isn't really warranted.
4629 //
4630 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4631 return FALSE;
4632 }
4633 *pbytes = 0;
4634 }
4635 return TRUE;
4636 }
4637
4638 #define MAX_INPUT_EVENTS 2000
4639
4640 // This code is a copy of JDK's stdinAvailable
4641 // from src/windows/hpi/src/sys_api_md.c
4642
4643 static int stdinAvailable(int fd, long *pbytes) {
4644 HANDLE han;
4645 DWORD numEventsRead = 0; // Number of events read from buffer
4646 DWORD numEvents = 0; // Number of events in buffer
4647 DWORD i = 0; // Loop index
4648 DWORD curLength = 0; // Position marker
4649 DWORD actualLength = 0; // Number of bytes readable
4650 BOOL error = FALSE; // Error holder
4651 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4652
4653 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4654 return FALSE;
4655 }
4656
4657 // Construct an array of input records in the console buffer
4658 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4659 if (error == 0) {
4660 return nonSeekAvailable(fd, pbytes);
4661 }
4662
4663 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4664 if (numEvents > MAX_INPUT_EVENTS) {
4665 numEvents = MAX_INPUT_EVENTS;
4666 }
4667
4668 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4669 if (lpBuffer == NULL) {
4670 return FALSE;
4671 }
4672
4673 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4674 if (error == 0) {
4675 os::free(lpBuffer);
4676 return FALSE;
4677 }
4678
4679 // Examine input records for the number of bytes available
4680 for (i=0; i<numEvents; i++) {
4681 if (lpBuffer[i].EventType == KEY_EVENT) {
4682
4683 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4684 &(lpBuffer[i].Event);
4685 if (keyRecord->bKeyDown == TRUE) {
4686 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4687 curLength++;
4688 if (*keyPressed == '\r') {
4689 actualLength = curLength;
4690 }
4691 }
4692 }
4693 }
4694
4695 if (lpBuffer != NULL) {
4696 os::free(lpBuffer);
4697 }
4698
4699 *pbytes = (long) actualLength;
4700 return TRUE;
4701 }
4702
4703 // Map a block of memory.
4704 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4705 char *addr, size_t bytes, bool read_only,
4706 bool allow_exec) {
4707 HANDLE hFile;
4708 char* base;
4709
4710 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4711 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4712 if (hFile == NULL) {
4713 if (PrintMiscellaneous && Verbose) {
4714 DWORD err = GetLastError();
4715 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4716 }
4717 return NULL;
4718 }
4719
4720 if (allow_exec) {
4721 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4722 // unless it comes from a PE image (which the shared archive is not.)
4723 // Even VirtualProtect refuses to give execute access to mapped memory
4724 // that was not previously executable.
4725 //
4726 // Instead, stick the executable region in anonymous memory. Yuck.
4727 // Penalty is that ~4 pages will not be shareable - in the future
4728 // we might consider DLLizing the shared archive with a proper PE
4729 // header so that mapping executable + sharing is possible.
4730
4731 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4732 PAGE_READWRITE);
4733 if (base == NULL) {
4734 if (PrintMiscellaneous && Verbose) {
4735 DWORD err = GetLastError();
4736 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4737 }
4738 CloseHandle(hFile);
4739 return NULL;
4740 }
4741
4742 DWORD bytes_read;
4743 OVERLAPPED overlapped;
4744 overlapped.Offset = (DWORD)file_offset;
4745 overlapped.OffsetHigh = 0;
4746 overlapped.hEvent = NULL;
4747 // ReadFile guarantees that if the return value is true, the requested
4748 // number of bytes were read before returning.
4749 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4750 if (!res) {
4751 if (PrintMiscellaneous && Verbose) {
4752 DWORD err = GetLastError();
4753 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4754 }
4755 release_memory(base, bytes);
4756 CloseHandle(hFile);
4757 return NULL;
4758 }
4759 } else {
4760 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4761 NULL /* file_name */);
4762 if (hMap == NULL) {
4763 if (PrintMiscellaneous && Verbose) {
4764 DWORD err = GetLastError();
4765 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4766 }
4767 CloseHandle(hFile);
4768 return NULL;
4769 }
4770
4771 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4772 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4773 (DWORD)bytes, addr);
4774 if (base == NULL) {
4775 if (PrintMiscellaneous && Verbose) {
4776 DWORD err = GetLastError();
4777 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4778 }
4779 CloseHandle(hMap);
4780 CloseHandle(hFile);
4781 return NULL;
4782 }
4783
4784 if (CloseHandle(hMap) == 0) {
4785 if (PrintMiscellaneous && Verbose) {
4786 DWORD err = GetLastError();
4787 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4788 }
4789 CloseHandle(hFile);
4790 return base;
4791 }
4792 }
4793
4794 if (allow_exec) {
4795 DWORD old_protect;
4796 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4797 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4798
4799 if (!res) {
4800 if (PrintMiscellaneous && Verbose) {
4801 DWORD err = GetLastError();
4802 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4803 }
4804 // Don't consider this a hard error, on IA32 even if the
4805 // VirtualProtect fails, we should still be able to execute
4806 CloseHandle(hFile);
4807 return base;
4808 }
4809 }
4810
4811 if (CloseHandle(hFile) == 0) {
4812 if (PrintMiscellaneous && Verbose) {
4813 DWORD err = GetLastError();
4814 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4815 }
4816 return base;
4817 }
4818
4819 return base;
4820 }
4821
4822
4823 // Remap a block of memory.
4824 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4825 char *addr, size_t bytes, bool read_only,
4826 bool allow_exec) {
4827 // This OS does not allow existing memory maps to be remapped so we
4828 // have to unmap the memory before we remap it.
4829 if (!os::unmap_memory(addr, bytes)) {
4830 return NULL;
4831 }
4832
4833 // There is a very small theoretical window between the unmap_memory()
4834 // call above and the map_memory() call below where a thread in native
4835 // code may be able to access an address that is no longer mapped.
4836
4837 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4838 read_only, allow_exec);
4839 }
4840
4841
4842 // Unmap a block of memory.
4843 // Returns true=success, otherwise false.
4844
4845 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4846 BOOL result = UnmapViewOfFile(addr);
4847 if (result == 0) {
4848 if (PrintMiscellaneous && Verbose) {
4849 DWORD err = GetLastError();
4850 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4851 }
4852 return false;
4853 }
4854 return true;
4855 }
4856
4857 void os::pause() {
4858 char filename[MAX_PATH];
4859 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4860 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4861 } else {
4862 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4863 }
4864
4865 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4866 if (fd != -1) {
4867 struct stat buf;
4868 ::close(fd);
4869 while (::stat(filename, &buf) == 0) {
4870 Sleep(100);
4871 }
4872 } else {
4873 jio_fprintf(stderr,
4874 "Could not open pause file '%s', continuing immediately.\n", filename);
4875 }
4876 }
4877
4878 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4879 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4880 }
4881
4882 // See the caveats for this class in os_windows.hpp
4883 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4884 // into this method and returns false. If no OS EXCEPTION was raised, returns
4885 // true.
4886 // The callback is supposed to provide the method that should be protected.
4887 //
4888 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4889 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4890 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4891 "crash_protection already set?");
4892
4893 bool success = true;
4894 __try {
4895 WatcherThread::watcher_thread()->set_crash_protection(this);
4896 cb.call();
4897 } __except(EXCEPTION_EXECUTE_HANDLER) {
4898 // only for protection, nothing to do
4899 success = false;
4900 }
4901 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4902 return success;
4903 }
4904
4905 // An Event wraps a win32 "CreateEvent" kernel handle.
4906 //
4907 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4908 //
4909 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4910 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4911 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4912 // In addition, an unpark() operation might fetch the handle field, but the
4913 // event could recycle between the fetch and the SetEvent() operation.
4914 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4915 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4916 // on an stale but recycled handle would be harmless, but in practice this might
4917 // confuse other non-Sun code, so it's not a viable approach.
4918 //
4919 // 2: Once a win32 event handle is associated with an Event, it remains associated
4920 // with the Event. The event handle is never closed. This could be construed
4921 // as handle leakage, but only up to the maximum # of threads that have been extant
4922 // at any one time. This shouldn't be an issue, as windows platforms typically
4923 // permit a process to have hundreds of thousands of open handles.
4924 //
4925 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4926 // and release unused handles.
4927 //
4928 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4929 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4930 //
4931 // 5. Use an RCU-like mechanism (Read-Copy Update).
4932 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4933 //
4934 // We use (2).
4935 //
4936 // TODO-FIXME:
4937 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4938 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4939 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4940 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4941 // into a single win32 CreateEvent() handle.
4942 //
4943 // Assumption:
4944 // Only one parker can exist on an event, which is why we allocate
4945 // them per-thread. Multiple unparkers can coexist.
4946 //
4947 // _Event transitions in park()
4948 // -1 => -1 : illegal
4949 // 1 => 0 : pass - return immediately
4950 // 0 => -1 : block; then set _Event to 0 before returning
4951 //
4952 // _Event transitions in unpark()
4953 // 0 => 1 : just return
4954 // 1 => 1 : just return
4955 // -1 => either 0 or 1; must signal target thread
4956 // That is, we can safely transition _Event from -1 to either
4957 // 0 or 1.
4958 //
4959 // _Event serves as a restricted-range semaphore.
4960 // -1 : thread is blocked, i.e. there is a waiter
4961 // 0 : neutral: thread is running or ready,
4962 // could have been signaled after a wait started
4963 // 1 : signaled - thread is running or ready
4964 //
4965 // Another possible encoding of _Event would be with
4966 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4967 //
4968
4969 int os::PlatformEvent::park(jlong Millis) {
4970 // Transitions for _Event:
4971 // -1 => -1 : illegal
4972 // 1 => 0 : pass - return immediately
4973 // 0 => -1 : block; then set _Event to 0 before returning
4974
4975 guarantee(_ParkHandle != NULL , "Invariant");
4976 guarantee(Millis > 0 , "Invariant");
4977
4978 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4979 // the initial park() operation.
4980 // Consider: use atomic decrement instead of CAS-loop
4981
4982 int v;
4983 for (;;) {
4984 v = _Event;
4985 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4986 }
4987 guarantee((v == 0) || (v == 1), "invariant");
4988 if (v != 0) return OS_OK;
4989
4990 // Do this the hard way by blocking ...
4991 // TODO: consider a brief spin here, gated on the success of recent
4992 // spin attempts by this thread.
4993 //
4994 // We decompose long timeouts into series of shorter timed waits.
4995 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4996 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4997 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4998 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4999 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5000 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5001 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5002 // for the already waited time. This policy does not admit any new outcomes.
5003 // In the future, however, we might want to track the accumulated wait time and
5004 // adjust Millis accordingly if we encounter a spurious wakeup.
5005
5006 const int MAXTIMEOUT = 0x10000000;
5007 DWORD rv = WAIT_TIMEOUT;
5008 while (_Event < 0 && Millis > 0) {
5009 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5010 if (Millis > MAXTIMEOUT) {
5011 prd = MAXTIMEOUT;
5012 }
5013 rv = ::WaitForSingleObject(_ParkHandle, prd);
5014 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5015 if (rv == WAIT_TIMEOUT) {
5016 Millis -= prd;
5017 }
5018 }
5019 v = _Event;
5020 _Event = 0;
5021 // see comment at end of os::PlatformEvent::park() below:
5022 OrderAccess::fence();
5023 // If we encounter a nearly simultanous timeout expiry and unpark()
5024 // we return OS_OK indicating we awoke via unpark().
5025 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5026 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5027 }
5028
5029 void os::PlatformEvent::park() {
5030 // Transitions for _Event:
5031 // -1 => -1 : illegal
5032 // 1 => 0 : pass - return immediately
5033 // 0 => -1 : block; then set _Event to 0 before returning
5034
5035 guarantee(_ParkHandle != NULL, "Invariant");
5036 // Invariant: Only the thread associated with the Event/PlatformEvent
5037 // may call park().
5038 // Consider: use atomic decrement instead of CAS-loop
5039 int v;
5040 for (;;) {
5041 v = _Event;
5042 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5043 }
5044 guarantee((v == 0) || (v == 1), "invariant");
5045 if (v != 0) return;
5046
5047 // Do this the hard way by blocking ...
5048 // TODO: consider a brief spin here, gated on the success of recent
5049 // spin attempts by this thread.
5050 while (_Event < 0) {
5051 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5052 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5053 }
5054
5055 // Usually we'll find _Event == 0 at this point, but as
5056 // an optional optimization we clear it, just in case can
5057 // multiple unpark() operations drove _Event up to 1.
5058 _Event = 0;
5059 OrderAccess::fence();
5060 guarantee(_Event >= 0, "invariant");
5061 }
5062
5063 void os::PlatformEvent::unpark() {
5064 guarantee(_ParkHandle != NULL, "Invariant");
5065
5066 // Transitions for _Event:
5067 // 0 => 1 : just return
5068 // 1 => 1 : just return
5069 // -1 => either 0 or 1; must signal target thread
5070 // That is, we can safely transition _Event from -1 to either
5071 // 0 or 1.
5072 // See also: "Semaphores in Plan 9" by Mullender & Cox
5073 //
5074 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5075 // that it will take two back-to-back park() calls for the owning
5076 // thread to block. This has the benefit of forcing a spurious return
5077 // from the first park() call after an unpark() call which will help
5078 // shake out uses of park() and unpark() without condition variables.
5079
5080 if (Atomic::xchg(1, &_Event) >= 0) return;
5081
5082 ::SetEvent(_ParkHandle);
5083 }
5084
5085
5086 // JSR166
5087 // -------------------------------------------------------
5088
5089 // The Windows implementation of Park is very straightforward: Basic
5090 // operations on Win32 Events turn out to have the right semantics to
5091 // use them directly. We opportunistically resuse the event inherited
5092 // from Monitor.
5093
5094 void Parker::park(bool isAbsolute, jlong time) {
5095 guarantee(_ParkEvent != NULL, "invariant");
5096 // First, demultiplex/decode time arguments
5097 if (time < 0) { // don't wait
5098 return;
5099 } else if (time == 0 && !isAbsolute) {
5100 time = INFINITE;
5101 } else if (isAbsolute) {
5102 time -= os::javaTimeMillis(); // convert to relative time
5103 if (time <= 0) { // already elapsed
5104 return;
5105 }
5106 } else { // relative
5107 time /= 1000000; // Must coarsen from nanos to millis
5108 if (time == 0) { // Wait for the minimal time unit if zero
5109 time = 1;
5110 }
5111 }
5112
5113 JavaThread* thread = (JavaThread*)(Thread::current());
5114 assert(thread->is_Java_thread(), "Must be JavaThread");
5115 JavaThread *jt = (JavaThread *)thread;
5116
5117 // Don't wait if interrupted or already triggered
5118 if (Thread::is_interrupted(thread, false) ||
5119 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5120 ResetEvent(_ParkEvent);
5121 return;
5122 } else {
5123 ThreadBlockInVM tbivm(jt);
5124 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5125 jt->set_suspend_equivalent();
5126
5127 WaitForSingleObject(_ParkEvent, time);
5128 ResetEvent(_ParkEvent);
5129
5130 // If externally suspended while waiting, re-suspend
5131 if (jt->handle_special_suspend_equivalent_condition()) {
5132 jt->java_suspend_self();
5133 }
5134 }
5135 }
5136
5137 void Parker::unpark() {
5138 guarantee(_ParkEvent != NULL, "invariant");
5139 SetEvent(_ParkEvent);
5140 }
5141
5142 // Run the specified command in a separate process. Return its exit value,
5143 // or -1 on failure (e.g. can't create a new process).
5144 int os::fork_and_exec(char* cmd) {
5145 STARTUPINFO si;
5146 PROCESS_INFORMATION pi;
5147
5148 memset(&si, 0, sizeof(si));
5149 si.cb = sizeof(si);
5150 memset(&pi, 0, sizeof(pi));
5151 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5152 cmd, // command line
5153 NULL, // process security attribute
5154 NULL, // thread security attribute
5155 TRUE, // inherits system handles
5156 0, // no creation flags
5157 NULL, // use parent's environment block
5158 NULL, // use parent's starting directory
5159 &si, // (in) startup information
5160 &pi); // (out) process information
5161
5162 if (rslt) {
5163 // Wait until child process exits.
5164 WaitForSingleObject(pi.hProcess, INFINITE);
5165
5166 DWORD exit_code;
5167 GetExitCodeProcess(pi.hProcess, &exit_code);
5168
5169 // Close process and thread handles.
5170 CloseHandle(pi.hProcess);
5171 CloseHandle(pi.hThread);
5172
5173 return (int)exit_code;
5174 } else {
5175 return -1;
5176 }
5177 }
5178
5179 //--------------------------------------------------------------------------------------------------
5180 // Non-product code
5181
5182 static int mallocDebugIntervalCounter = 0;
5183 static int mallocDebugCounter = 0;
5184 bool os::check_heap(bool force) {
5185 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5186 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5187 // Note: HeapValidate executes two hardware breakpoints when it finds something
5188 // wrong; at these points, eax contains the address of the offending block (I think).
5189 // To get to the exlicit error message(s) below, just continue twice.
5190 HANDLE heap = GetProcessHeap();
5191
5192 // If we fail to lock the heap, then gflags.exe has been used
5193 // or some other special heap flag has been set that prevents
5194 // locking. We don't try to walk a heap we can't lock.
5195 if (HeapLock(heap) != 0) {
5196 PROCESS_HEAP_ENTRY phe;
5197 phe.lpData = NULL;
5198 while (HeapWalk(heap, &phe) != 0) {
5199 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5200 !HeapValidate(heap, 0, phe.lpData)) {
5201 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5202 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5203 fatal("corrupted C heap");
5204 }
5205 }
5206 DWORD err = GetLastError();
5207 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5208 fatal(err_msg("heap walk aborted with error %d", err));
5209 }
5210 HeapUnlock(heap);
5211 }
5212 mallocDebugIntervalCounter = 0;
5213 }
5214 return true;
5215 }
5216
5217
5218 bool os::find(address addr, outputStream* st) {
5219 // Nothing yet
5220 return false;
5221 }
5222
5223 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5224 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5225
5226 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5227 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5228 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5229 address addr = (address) exceptionRecord->ExceptionInformation[1];
5230
5231 if (os::is_memory_serialize_page(thread, addr)) {
5232 return EXCEPTION_CONTINUE_EXECUTION;
5233 }
5234 }
5235
5236 return EXCEPTION_CONTINUE_SEARCH;
5237 }
5238
5239 // We don't build a headless jre for Windows
5240 bool os::is_headless_jre() { return false; }
5241
5242 static jint initSock() {
5243 WSADATA wsadata;
5244
5245 if (!os::WinSock2Dll::WinSock2Available()) {
5246 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5247 ::GetLastError());
5248 return JNI_ERR;
5249 }
5250
5251 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5252 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5253 ::GetLastError());
5254 return JNI_ERR;
5255 }
5256 return JNI_OK;
5257 }
5258
5259 struct hostent* os::get_host_by_name(char* name) {
5260 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5261 }
5262
5263 int os::socket_close(int fd) {
5264 return ::closesocket(fd);
5265 }
5266
5267 int os::socket(int domain, int type, int protocol) {
5268 return ::socket(domain, type, protocol);
5269 }
5270
5271 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5272 return ::connect(fd, him, len);
5273 }
5274
5275 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5276 return ::recv(fd, buf, (int)nBytes, flags);
5277 }
5278
5279 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5280 return ::send(fd, buf, (int)nBytes, flags);
5281 }
5282
5283 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5284 return ::send(fd, buf, (int)nBytes, flags);
5285 }
5286
5287 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5288 #if defined(IA32)
5289 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5290 #elif defined (AMD64)
5291 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5292 #endif
5293
5294 // returns true if thread could be suspended,
5295 // false otherwise
5296 static bool do_suspend(HANDLE* h) {
5297 if (h != NULL) {
5298 if (SuspendThread(*h) != ~0) {
5299 return true;
5300 }
5301 }
5302 return false;
5303 }
5304
5305 // resume the thread
5306 // calling resume on an active thread is a no-op
5307 static void do_resume(HANDLE* h) {
5308 if (h != NULL) {
5309 ResumeThread(*h);
5310 }
5311 }
5312
5313 // retrieve a suspend/resume context capable handle
5314 // from the tid. Caller validates handle return value.
5315 void get_thread_handle_for_extended_context(HANDLE* h,
5316 OSThread::thread_id_t tid) {
5317 if (h != NULL) {
5318 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5319 }
5320 }
5321
5322 // Thread sampling implementation
5323 //
5324 void os::SuspendedThreadTask::internal_do_task() {
5325 CONTEXT ctxt;
5326 HANDLE h = NULL;
5327
5328 // get context capable handle for thread
5329 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5330
5331 // sanity
5332 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5333 return;
5334 }
5335
5336 // suspend the thread
5337 if (do_suspend(&h)) {
5338 ctxt.ContextFlags = sampling_context_flags;
5339 // get thread context
5340 GetThreadContext(h, &ctxt);
5341 SuspendedThreadTaskContext context(_thread, &ctxt);
5342 // pass context to Thread Sampling impl
5343 do_task(context);
5344 // resume thread
5345 do_resume(&h);
5346 }
5347
5348 // close handle
5349 CloseHandle(h);
5350 }
5351
5352
5353 // Kernel32 API
5354 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5355 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5356 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5357 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5358 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5359
5360 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5361 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5362 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5363 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5364 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5365
5366
5367 BOOL os::Kernel32Dll::initialized = FALSE;
5368 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5369 assert(initialized && _GetLargePageMinimum != NULL,
5370 "GetLargePageMinimumAvailable() not yet called");
5371 return _GetLargePageMinimum();
5372 }
5373
5374 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5375 if (!initialized) {
5376 initialize();
5377 }
5378 return _GetLargePageMinimum != NULL;
5379 }
5380
5381 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5382 if (!initialized) {
5383 initialize();
5384 }
5385 return _VirtualAllocExNuma != NULL;
5386 }
5387
5388 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5389 SIZE_T bytes, DWORD flags,
5390 DWORD prot, DWORD node) {
5391 assert(initialized && _VirtualAllocExNuma != NULL,
5392 "NUMACallsAvailable() not yet called");
5393
5394 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5395 }
5396
5397 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5398 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5399 "NUMACallsAvailable() not yet called");
5400
5401 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5402 }
5403
5404 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5405 PULONGLONG proc_mask) {
5406 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5407 "NUMACallsAvailable() not yet called");
5408
5409 return _GetNumaNodeProcessorMask(node, proc_mask);
5410 }
5411
5412 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5413 ULONG FrameToCapture,
5414 PVOID* BackTrace,
5415 PULONG BackTraceHash) {
5416 if (!initialized) {
5417 initialize();
5418 }
5419
5420 if (_RtlCaptureStackBackTrace != NULL) {
5421 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5422 BackTrace, BackTraceHash);
5423 } else {
5424 return 0;
5425 }
5426 }
5427
5428 void os::Kernel32Dll::initializeCommon() {
5429 if (!initialized) {
5430 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5431 assert(handle != NULL, "Just check");
5432 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5433 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5434 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5435 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5436 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5437 initialized = TRUE;
5438 }
5439 }
5440
5441
5442
5443 #ifndef JDK6_OR_EARLIER
5444
5445 void os::Kernel32Dll::initialize() {
5446 initializeCommon();
5447 }
5448
5449
5450 // Kernel32 API
5451 inline BOOL os::Kernel32Dll::SwitchToThread() {
5452 return ::SwitchToThread();
5453 }
5454
5455 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5456 return true;
5457 }
5458
5459 // Help tools
5460 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5461 return true;
5462 }
5463
5464 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5465 DWORD th32ProcessId) {
5466 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5467 }
5468
5469 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5470 LPMODULEENTRY32 lpme) {
5471 return ::Module32First(hSnapshot, lpme);
5472 }
5473
5474 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5475 LPMODULEENTRY32 lpme) {
5476 return ::Module32Next(hSnapshot, lpme);
5477 }
5478
5479 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5480 ::GetNativeSystemInfo(lpSystemInfo);
5481 }
5482
5483 // PSAPI API
5484 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5485 HMODULE *lpModule, DWORD cb,
5486 LPDWORD lpcbNeeded) {
5487 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5488 }
5489
5490 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5491 HMODULE hModule,
5492 LPTSTR lpFilename,
5493 DWORD nSize) {
5494 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5495 }
5496
5497 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5498 HMODULE hModule,
5499 LPMODULEINFO lpmodinfo,
5500 DWORD cb) {
5501 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5502 }
5503
5504 inline BOOL os::PSApiDll::PSApiAvailable() {
5505 return true;
5506 }
5507
5508
5509 // WinSock2 API
5510 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5511 LPWSADATA lpWSAData) {
5512 return ::WSAStartup(wVersionRequested, lpWSAData);
5513 }
5514
5515 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5516 return ::gethostbyname(name);
5517 }
5518
5519 inline BOOL os::WinSock2Dll::WinSock2Available() {
5520 return true;
5521 }
5522
5523 // Advapi API
5524 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5525 BOOL DisableAllPrivileges,
5526 PTOKEN_PRIVILEGES NewState,
5527 DWORD BufferLength,
5528 PTOKEN_PRIVILEGES PreviousState,
5529 PDWORD ReturnLength) {
5530 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5531 BufferLength, PreviousState, ReturnLength);
5532 }
5533
5534 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5535 DWORD DesiredAccess,
5536 PHANDLE TokenHandle) {
5537 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5538 }
5539
5540 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5541 LPCTSTR lpName,
5542 PLUID lpLuid) {
5543 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5544 }
5545
5546 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5547 return true;
5548 }
5549
5550 void* os::get_default_process_handle() {
5551 return (void*)GetModuleHandle(NULL);
5552 }
5553
5554 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5555 // which is used to find statically linked in agents.
5556 // Additionally for windows, takes into account __stdcall names.
5557 // Parameters:
5558 // sym_name: Symbol in library we are looking for
5559 // lib_name: Name of library to look in, NULL for shared libs.
5560 // is_absolute_path == true if lib_name is absolute path to agent
5561 // such as "C:/a/b/L.dll"
5562 // == false if only the base name of the library is passed in
5563 // such as "L"
5564 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5565 bool is_absolute_path) {
5566 char *agent_entry_name;
5567 size_t len;
5568 size_t name_len;
5569 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5570 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5571 const char *start;
5572
5573 if (lib_name != NULL) {
5574 len = name_len = strlen(lib_name);
5575 if (is_absolute_path) {
5576 // Need to strip path, prefix and suffix
5577 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5578 lib_name = ++start;
5579 } else {
5580 // Need to check for drive prefix
5581 if ((start = strchr(lib_name, ':')) != NULL) {
5582 lib_name = ++start;
5583 }
5584 }
5585 if (len <= (prefix_len + suffix_len)) {
5586 return NULL;
5587 }
5588 lib_name += prefix_len;
5589 name_len = strlen(lib_name) - suffix_len;
5590 }
5591 }
5592 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5593 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5594 if (agent_entry_name == NULL) {
5595 return NULL;
5596 }
5597 if (lib_name != NULL) {
5598 const char *p = strrchr(sym_name, '@');
5599 if (p != NULL && p != sym_name) {
5600 // sym_name == _Agent_OnLoad@XX
5601 strncpy(agent_entry_name, sym_name, (p - sym_name));
5602 agent_entry_name[(p-sym_name)] = '\0';
5603 // agent_entry_name == _Agent_OnLoad
5604 strcat(agent_entry_name, "_");
5605 strncat(agent_entry_name, lib_name, name_len);
5606 strcat(agent_entry_name, p);
5607 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5608 } else {
5609 strcpy(agent_entry_name, sym_name);
5610 strcat(agent_entry_name, "_");
5611 strncat(agent_entry_name, lib_name, name_len);
5612 }
5613 } else {
5614 strcpy(agent_entry_name, sym_name);
5615 }
5616 return agent_entry_name;
5617 }
5618
5619 #else
5620 // Kernel32 API
5621 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5622 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5623 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5624 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5625 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5626
5627 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5628 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5629 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5630 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5631 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5632
5633 void os::Kernel32Dll::initialize() {
5634 if (!initialized) {
5635 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5636 assert(handle != NULL, "Just check");
5637
5638 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5639 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5640 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5641 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5642 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5643 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5644 initializeCommon(); // resolve the functions that always need resolving
5645
5646 initialized = TRUE;
5647 }
5648 }
5649
5650 BOOL os::Kernel32Dll::SwitchToThread() {
5651 assert(initialized && _SwitchToThread != NULL,
5652 "SwitchToThreadAvailable() not yet called");
5653 return _SwitchToThread();
5654 }
5655
5656
5657 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5658 if (!initialized) {
5659 initialize();
5660 }
5661 return _SwitchToThread != NULL;
5662 }
5663
5664 // Help tools
5665 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5666 if (!initialized) {
5667 initialize();
5668 }
5669 return _CreateToolhelp32Snapshot != NULL &&
5670 _Module32First != NULL &&
5671 _Module32Next != NULL;
5672 }
5673
5674 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5675 DWORD th32ProcessId) {
5676 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5677 "HelpToolsAvailable() not yet called");
5678
5679 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5680 }
5681
5682 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5683 assert(initialized && _Module32First != NULL,
5684 "HelpToolsAvailable() not yet called");
5685
5686 return _Module32First(hSnapshot, lpme);
5687 }
5688
5689 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5690 LPMODULEENTRY32 lpme) {
5691 assert(initialized && _Module32Next != NULL,
5692 "HelpToolsAvailable() not yet called");
5693
5694 return _Module32Next(hSnapshot, lpme);
5695 }
5696
5697
5698 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5699 if (!initialized) {
5700 initialize();
5701 }
5702 return _GetNativeSystemInfo != NULL;
5703 }
5704
5705 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5706 assert(initialized && _GetNativeSystemInfo != NULL,
5707 "GetNativeSystemInfoAvailable() not yet called");
5708
5709 _GetNativeSystemInfo(lpSystemInfo);
5710 }
5711
5712 // PSAPI API
5713
5714
5715 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5716 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5717 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5718
5719 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5720 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5721 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5722 BOOL os::PSApiDll::initialized = FALSE;
5723
5724 void os::PSApiDll::initialize() {
5725 if (!initialized) {
5726 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5727 if (handle != NULL) {
5728 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5729 "EnumProcessModules");
5730 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5731 "GetModuleFileNameExA");
5732 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5733 "GetModuleInformation");
5734 }
5735 initialized = TRUE;
5736 }
5737 }
5738
5739
5740
5741 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5742 DWORD cb, LPDWORD lpcbNeeded) {
5743 assert(initialized && _EnumProcessModules != NULL,
5744 "PSApiAvailable() not yet called");
5745 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5746 }
5747
5748 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5749 LPTSTR lpFilename, DWORD nSize) {
5750 assert(initialized && _GetModuleFileNameEx != NULL,
5751 "PSApiAvailable() not yet called");
5752 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5753 }
5754
5755 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5756 LPMODULEINFO lpmodinfo, DWORD cb) {
5757 assert(initialized && _GetModuleInformation != NULL,
5758 "PSApiAvailable() not yet called");
5759 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5760 }
5761
5762 BOOL os::PSApiDll::PSApiAvailable() {
5763 if (!initialized) {
5764 initialize();
5765 }
5766 return _EnumProcessModules != NULL &&
5767 _GetModuleFileNameEx != NULL &&
5768 _GetModuleInformation != NULL;
5769 }
5770
5771
5772 // WinSock2 API
5773 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5774 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5775
5776 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5777 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5778 BOOL os::WinSock2Dll::initialized = FALSE;
5779
5780 void os::WinSock2Dll::initialize() {
5781 if (!initialized) {
5782 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5783 if (handle != NULL) {
5784 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5785 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5786 }
5787 initialized = TRUE;
5788 }
5789 }
5790
5791
5792 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5793 assert(initialized && _WSAStartup != NULL,
5794 "WinSock2Available() not yet called");
5795 return _WSAStartup(wVersionRequested, lpWSAData);
5796 }
5797
5798 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5799 assert(initialized && _gethostbyname != NULL,
5800 "WinSock2Available() not yet called");
5801 return _gethostbyname(name);
5802 }
5803
5804 BOOL os::WinSock2Dll::WinSock2Available() {
5805 if (!initialized) {
5806 initialize();
5807 }
5808 return _WSAStartup != NULL &&
5809 _gethostbyname != NULL;
5810 }
5811
5812 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5813 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5814 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5815
5816 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5817 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5818 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5819 BOOL os::Advapi32Dll::initialized = FALSE;
5820
5821 void os::Advapi32Dll::initialize() {
5822 if (!initialized) {
5823 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5824 if (handle != NULL) {
5825 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5826 "AdjustTokenPrivileges");
5827 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5828 "OpenProcessToken");
5829 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5830 "LookupPrivilegeValueA");
5831 }
5832 initialized = TRUE;
5833 }
5834 }
5835
5836 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5837 BOOL DisableAllPrivileges,
5838 PTOKEN_PRIVILEGES NewState,
5839 DWORD BufferLength,
5840 PTOKEN_PRIVILEGES PreviousState,
5841 PDWORD ReturnLength) {
5842 assert(initialized && _AdjustTokenPrivileges != NULL,
5843 "AdvapiAvailable() not yet called");
5844 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5845 BufferLength, PreviousState, ReturnLength);
5846 }
5847
5848 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5849 DWORD DesiredAccess,
5850 PHANDLE TokenHandle) {
5851 assert(initialized && _OpenProcessToken != NULL,
5852 "AdvapiAvailable() not yet called");
5853 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5854 }
5855
5856 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5857 LPCTSTR lpName, PLUID lpLuid) {
5858 assert(initialized && _LookupPrivilegeValue != NULL,
5859 "AdvapiAvailable() not yet called");
5860 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5861 }
5862
5863 BOOL os::Advapi32Dll::AdvapiAvailable() {
5864 if (!initialized) {
5865 initialize();
5866 }
5867 return _AdjustTokenPrivileges != NULL &&
5868 _OpenProcessToken != NULL &&
5869 _LookupPrivilegeValue != NULL;
5870 }
5871
5872 #endif
5873
5874 #ifndef PRODUCT
5875
5876 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5877 // contiguous memory block at a particular address.
5878 // The test first tries to find a good approximate address to allocate at by using the same
5879 // method to allocate some memory at any address. The test then tries to allocate memory in
5880 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5881 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5882 // the previously allocated memory is available for allocation. The only actual failure
5883 // that is reported is when the test tries to allocate at a particular location but gets a
5884 // different valid one. A NULL return value at this point is not considered an error but may
5885 // be legitimate.
5886 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5887 void TestReserveMemorySpecial_test() {
5888 if (!UseLargePages) {
5889 if (VerboseInternalVMTests) {
5890 gclog_or_tty->print("Skipping test because large pages are disabled");
5891 }
5892 return;
5893 }
5894 // save current value of globals
5895 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5896 bool old_use_numa_interleaving = UseNUMAInterleaving;
5897
5898 // set globals to make sure we hit the correct code path
5899 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5900
5901 // do an allocation at an address selected by the OS to get a good one.
5902 const size_t large_allocation_size = os::large_page_size() * 4;
5903 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5904 if (result == NULL) {
5905 if (VerboseInternalVMTests) {
5906 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5907 large_allocation_size);
5908 }
5909 } else {
5910 os::release_memory_special(result, large_allocation_size);
5911
5912 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5913 // we managed to get it once.
5914 const size_t expected_allocation_size = os::large_page_size();
5915 char* expected_location = result + os::large_page_size();
5916 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5917 if (actual_location == NULL) {
5918 if (VerboseInternalVMTests) {
5919 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5920 expected_location, large_allocation_size);
5921 }
5922 } else {
5923 // release memory
5924 os::release_memory_special(actual_location, expected_allocation_size);
5925 // only now check, after releasing any memory to avoid any leaks.
5926 assert(actual_location == expected_location,
5927 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5928 expected_location, expected_allocation_size, actual_location));
5929 }
5930 }
5931
5932 // restore globals
5933 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5934 UseNUMAInterleaving = old_use_numa_interleaving;
5935 }
5936 #endif // PRODUCT
5937