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
986 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
987 PMINIDUMP_EXCEPTION_INFORMATION,
988 PMINIDUMP_USER_STREAM_INFORMATION,
989 PMINIDUMP_CALLBACK_INFORMATION);
990
991 void os::check_create_dump_limit(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
992 // First presume we can dump core file, detail checking done in abort()
993 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", get_current_directory(NULL, 0), current_process_id());
994 VMError::report_coredump_status(buffer, true);
995 }
996
997 void os::abort(bool dump_core, void* exceptionRecord, void* contextRecord) {
998 HINSTANCE dbghelp;
999 EXCEPTION_POINTERS ep;
1000 MINIDUMP_EXCEPTION_INFORMATION mei;
1001 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1002
1003 HANDLE hProcess = GetCurrentProcess();
1004 DWORD processId = GetCurrentProcessId();
1005 HANDLE dumpFile;
1006 MINIDUMP_TYPE dumpType;
1007 static const char* cwd;
1008 static char buffer[O_BUFLEN];
1009
1010 os::shutdown();
1011 if (!dump_core) return;
1012
1013 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
1014 #ifndef ASSERT
1015 // If running on a client version of Windows and user has not explicitly enabled dumping
1016 if (!os::win32::is_windows_server() && !CreateCoredumpOnCrash) {
1017 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
1018 return;
1019 // If running on a server version of Windows and user has explictly disabled dumping
1020 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1021 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1022 return;
1023 }
1024 #else
1025 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1026 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1027 return;
1028 }
1029 #endif
1030
1031 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1032
1033 if (dbghelp == NULL) {
1034 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1035 return;
1036 }
1037
1038 _MiniDumpWriteDump =
1039 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1040 PMINIDUMP_EXCEPTION_INFORMATION,
1041 PMINIDUMP_USER_STREAM_INFORMATION,
1042 PMINIDUMP_CALLBACK_INFORMATION),
1043 GetProcAddress(dbghelp,
1044 "MiniDumpWriteDump"));
1045
1046 if (_MiniDumpWriteDump == NULL) {
1047 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1048 return;
1049 }
1050
1051 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1052
1053 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1054 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1055 #if API_VERSION_NUMBER >= 11
1056 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1057 MiniDumpWithUnloadedModules);
1058 #endif
1059
1060 cwd = get_current_directory(NULL, 0);
1061 jio_snprintf(buffer, sizeof(buffer), "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1062 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1063
1064 if (dumpFile == INVALID_HANDLE_VALUE) {
1065 VMError::report_coredump_status("Failed to create file for dumping", false);
1066 return;
1067 }
1068
1069 if (exceptionRecord != NULL && contextRecord != NULL) {
1070 ep.ContextRecord = (PCONTEXT) contextRecord;
1071 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1072
1073 mei.ThreadId = GetCurrentThreadId();
1074 mei.ExceptionPointers = &ep;
1075 pmei = &mei;
1076 } else {
1077 pmei = NULL;
1078 }
1079
1080
1081 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1082 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1083 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1084 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1085 DWORD error = GetLastError();
1086 LPTSTR msgbuf = NULL;
1087
1088 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1089 FORMAT_MESSAGE_FROM_SYSTEM |
1090 FORMAT_MESSAGE_IGNORE_INSERTS,
1091 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1092
1093 jio_snprintf(buffer, sizeof(buffer), "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1094 LocalFree(msgbuf);
1095 } else {
1096 // Call to FormatMessage failed, just include the result from GetLastError
1097 jio_snprintf(buffer, sizeof(buffer), "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1098 }
1099 VMError::report_coredump_status(buffer, false);
1100 } else {
1101 VMError::report_coredump_status(buffer, true);
1102 }
1103
1104 CloseHandle(dumpFile);
1105 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1106 }
1107
1108 // Die immediately, no exit hook, no abort hook, no cleanup.
1109 void os::die() {
1110 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1111 }
1112
1113 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1114 // * dirent_md.c 1.15 00/02/02
1115 //
1116 // The declarations for DIR and struct dirent are in jvm_win32.h.
1117
1118 // Caller must have already run dirname through JVM_NativePath, which removes
1119 // duplicate slashes and converts all instances of '/' into '\\'.
1120
1121 DIR * os::opendir(const char *dirname) {
1122 assert(dirname != NULL, "just checking"); // hotspot change
1123 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1124 DWORD fattr; // hotspot change
1125 char alt_dirname[4] = { 0, 0, 0, 0 };
1126
1127 if (dirp == 0) {
1128 errno = ENOMEM;
1129 return 0;
1130 }
1131
1132 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1133 // as a directory in FindFirstFile(). We detect this case here and
1134 // prepend the current drive name.
1135 //
1136 if (dirname[1] == '\0' && dirname[0] == '\\') {
1137 alt_dirname[0] = _getdrive() + 'A' - 1;
1138 alt_dirname[1] = ':';
1139 alt_dirname[2] = '\\';
1140 alt_dirname[3] = '\0';
1141 dirname = alt_dirname;
1142 }
1143
1144 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1145 if (dirp->path == 0) {
1146 free(dirp);
1147 errno = ENOMEM;
1148 return 0;
1149 }
1150 strcpy(dirp->path, dirname);
1151
1152 fattr = GetFileAttributes(dirp->path);
1153 if (fattr == 0xffffffff) {
1154 free(dirp->path);
1155 free(dirp);
1156 errno = ENOENT;
1157 return 0;
1158 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1159 free(dirp->path);
1160 free(dirp);
1161 errno = ENOTDIR;
1162 return 0;
1163 }
1164
1165 // Append "*.*", or possibly "\\*.*", to path
1166 if (dirp->path[1] == ':' &&
1167 (dirp->path[2] == '\0' ||
1168 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1169 // No '\\' needed for cases like "Z:" or "Z:\"
1170 strcat(dirp->path, "*.*");
1171 } else {
1172 strcat(dirp->path, "\\*.*");
1173 }
1174
1175 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1176 if (dirp->handle == INVALID_HANDLE_VALUE) {
1177 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1178 free(dirp->path);
1179 free(dirp);
1180 errno = EACCES;
1181 return 0;
1182 }
1183 }
1184 return dirp;
1185 }
1186
1187 // parameter dbuf unused on Windows
1188 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1189 assert(dirp != NULL, "just checking"); // hotspot change
1190 if (dirp->handle == INVALID_HANDLE_VALUE) {
1191 return 0;
1192 }
1193
1194 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1195
1196 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1197 if (GetLastError() == ERROR_INVALID_HANDLE) {
1198 errno = EBADF;
1199 return 0;
1200 }
1201 FindClose(dirp->handle);
1202 dirp->handle = INVALID_HANDLE_VALUE;
1203 }
1204
1205 return &dirp->dirent;
1206 }
1207
1208 int os::closedir(DIR *dirp) {
1209 assert(dirp != NULL, "just checking"); // hotspot change
1210 if (dirp->handle != INVALID_HANDLE_VALUE) {
1211 if (!FindClose(dirp->handle)) {
1212 errno = EBADF;
1213 return -1;
1214 }
1215 dirp->handle = INVALID_HANDLE_VALUE;
1216 }
1217 free(dirp->path);
1218 free(dirp);
1219 return 0;
1220 }
1221
1222 // This must be hard coded because it's the system's temporary
1223 // directory not the java application's temp directory, ala java.io.tmpdir.
1224 const char* os::get_temp_directory() {
1225 static char path_buf[MAX_PATH];
1226 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1227 return path_buf;
1228 } else {
1229 path_buf[0] = '\0';
1230 return path_buf;
1231 }
1232 }
1233
1234 static bool file_exists(const char* filename) {
1235 if (filename == NULL || strlen(filename) == 0) {
1236 return false;
1237 }
1238 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1239 }
1240
1241 bool os::dll_build_name(char *buffer, size_t buflen,
1242 const char* pname, const char* fname) {
1243 bool retval = false;
1244 const size_t pnamelen = pname ? strlen(pname) : 0;
1245 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1246
1247 // Return error on buffer overflow.
1248 if (pnamelen + strlen(fname) + 10 > buflen) {
1249 return retval;
1250 }
1251
1252 if (pnamelen == 0) {
1253 jio_snprintf(buffer, buflen, "%s.dll", fname);
1254 retval = true;
1255 } else if (c == ':' || c == '\\') {
1256 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1257 retval = true;
1258 } else if (strchr(pname, *os::path_separator()) != NULL) {
1259 int n;
1260 char** pelements = split_path(pname, &n);
1261 if (pelements == NULL) {
1262 return false;
1263 }
1264 for (int i = 0; i < n; i++) {
1265 char* path = pelements[i];
1266 // Really shouldn't be NULL, but check can't hurt
1267 size_t plen = (path == NULL) ? 0 : strlen(path);
1268 if (plen == 0) {
1269 continue; // skip the empty path values
1270 }
1271 const char lastchar = path[plen - 1];
1272 if (lastchar == ':' || lastchar == '\\') {
1273 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1274 } else {
1275 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1276 }
1277 if (file_exists(buffer)) {
1278 retval = true;
1279 break;
1280 }
1281 }
1282 // release the storage
1283 for (int i = 0; i < n; i++) {
1284 if (pelements[i] != NULL) {
1285 FREE_C_HEAP_ARRAY(char, pelements[i]);
1286 }
1287 }
1288 if (pelements != NULL) {
1289 FREE_C_HEAP_ARRAY(char*, pelements);
1290 }
1291 } else {
1292 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1293 retval = true;
1294 }
1295 return retval;
1296 }
1297
1298 // Needs to be in os specific directory because windows requires another
1299 // header file <direct.h>
1300 const char* os::get_current_directory(char *buf, size_t buflen) {
1301 int n = static_cast<int>(buflen);
1302 if (buflen > INT_MAX) n = INT_MAX;
1303 return _getcwd(buf, n);
1304 }
1305
1306 //-----------------------------------------------------------
1307 // Helper functions for fatal error handler
1308 #ifdef _WIN64
1309 // Helper routine which returns true if address in
1310 // within the NTDLL address space.
1311 //
1312 static bool _addr_in_ntdll(address addr) {
1313 HMODULE hmod;
1314 MODULEINFO minfo;
1315
1316 hmod = GetModuleHandle("NTDLL.DLL");
1317 if (hmod == NULL) return false;
1318 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1319 &minfo, sizeof(MODULEINFO))) {
1320 return false;
1321 }
1322
1323 if ((addr >= minfo.lpBaseOfDll) &&
1324 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1325 return true;
1326 } else {
1327 return false;
1328 }
1329 }
1330 #endif
1331
1332 struct _modinfo {
1333 address addr;
1334 char* full_path; // point to a char buffer
1335 int buflen; // size of the buffer
1336 address base_addr;
1337 };
1338
1339 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1340 address top_address, void * param) {
1341 struct _modinfo *pmod = (struct _modinfo *)param;
1342 if (!pmod) return -1;
1343
1344 if (base_addr <= pmod->addr &&
1345 top_address > pmod->addr) {
1346 // if a buffer is provided, copy path name to the buffer
1347 if (pmod->full_path) {
1348 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1349 }
1350 pmod->base_addr = base_addr;
1351 return 1;
1352 }
1353 return 0;
1354 }
1355
1356 bool os::dll_address_to_library_name(address addr, char* buf,
1357 int buflen, int* offset) {
1358 // buf is not optional, but offset is optional
1359 assert(buf != NULL, "sanity check");
1360
1361 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1362 // return the full path to the DLL file, sometimes it returns path
1363 // to the corresponding PDB file (debug info); sometimes it only
1364 // returns partial path, which makes life painful.
1365
1366 struct _modinfo mi;
1367 mi.addr = addr;
1368 mi.full_path = buf;
1369 mi.buflen = buflen;
1370 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1371 // buf already contains path name
1372 if (offset) *offset = addr - mi.base_addr;
1373 return true;
1374 }
1375
1376 buf[0] = '\0';
1377 if (offset) *offset = -1;
1378 return false;
1379 }
1380
1381 bool os::dll_address_to_function_name(address addr, char *buf,
1382 int buflen, int *offset) {
1383 // buf is not optional, but offset is optional
1384 assert(buf != NULL, "sanity check");
1385
1386 if (Decoder::decode(addr, buf, buflen, offset)) {
1387 return true;
1388 }
1389 if (offset != NULL) *offset = -1;
1390 buf[0] = '\0';
1391 return false;
1392 }
1393
1394 // save the start and end address of jvm.dll into param[0] and param[1]
1395 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1396 address top_address, void * param) {
1397 if (!param) return -1;
1398
1399 if (base_addr <= (address)_locate_jvm_dll &&
1400 top_address > (address)_locate_jvm_dll) {
1401 ((address*)param)[0] = base_addr;
1402 ((address*)param)[1] = top_address;
1403 return 1;
1404 }
1405 return 0;
1406 }
1407
1408 address vm_lib_location[2]; // start and end address of jvm.dll
1409
1410 // check if addr is inside jvm.dll
1411 bool os::address_is_in_vm(address addr) {
1412 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1413 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1414 assert(false, "Can't find jvm module.");
1415 return false;
1416 }
1417 }
1418
1419 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1420 }
1421
1422 // print module info; param is outputStream*
1423 static int _print_module(const char* fname, address base_address,
1424 address top_address, void* param) {
1425 if (!param) return -1;
1426
1427 outputStream* st = (outputStream*)param;
1428
1429 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1430 return 0;
1431 }
1432
1433 // Loads .dll/.so and
1434 // in case of error it checks if .dll/.so was built for the
1435 // same architecture as Hotspot is running on
1436 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1437 void * result = LoadLibrary(name);
1438 if (result != NULL) {
1439 return result;
1440 }
1441
1442 DWORD errcode = GetLastError();
1443 if (errcode == ERROR_MOD_NOT_FOUND) {
1444 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1445 ebuf[ebuflen - 1] = '\0';
1446 return NULL;
1447 }
1448
1449 // Parsing dll below
1450 // If we can read dll-info and find that dll was built
1451 // for an architecture other than Hotspot is running in
1452 // - then print to buffer "DLL was built for a different architecture"
1453 // else call os::lasterror to obtain system error message
1454
1455 // Read system error message into ebuf
1456 // It may or may not be overwritten below (in the for loop and just above)
1457 lasterror(ebuf, (size_t) ebuflen);
1458 ebuf[ebuflen - 1] = '\0';
1459 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1460 if (fd < 0) {
1461 return NULL;
1462 }
1463
1464 uint32_t signature_offset;
1465 uint16_t lib_arch = 0;
1466 bool failed_to_get_lib_arch =
1467 ( // Go to position 3c in the dll
1468 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1469 ||
1470 // Read location of signature
1471 (sizeof(signature_offset) !=
1472 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1473 ||
1474 // Go to COFF File Header in dll
1475 // that is located after "signature" (4 bytes long)
1476 (os::seek_to_file_offset(fd,
1477 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1478 ||
1479 // Read field that contains code of architecture
1480 // that dll was built for
1481 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1482 );
1483
1484 ::close(fd);
1485 if (failed_to_get_lib_arch) {
1486 // file i/o error - report os::lasterror(...) msg
1487 return NULL;
1488 }
1489
1490 typedef struct {
1491 uint16_t arch_code;
1492 char* arch_name;
1493 } arch_t;
1494
1495 static const arch_t arch_array[] = {
1496 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1497 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1498 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1499 };
1500 #if (defined _M_IA64)
1501 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1502 #elif (defined _M_AMD64)
1503 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1504 #elif (defined _M_IX86)
1505 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1506 #else
1507 #error Method os::dll_load requires that one of following \
1508 is defined :_M_IA64,_M_AMD64 or _M_IX86
1509 #endif
1510
1511
1512 // Obtain a string for printf operation
1513 // lib_arch_str shall contain string what platform this .dll was built for
1514 // running_arch_str shall string contain what platform Hotspot was built for
1515 char *running_arch_str = NULL, *lib_arch_str = NULL;
1516 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1517 if (lib_arch == arch_array[i].arch_code) {
1518 lib_arch_str = arch_array[i].arch_name;
1519 }
1520 if (running_arch == arch_array[i].arch_code) {
1521 running_arch_str = arch_array[i].arch_name;
1522 }
1523 }
1524
1525 assert(running_arch_str,
1526 "Didn't find running architecture code in arch_array");
1527
1528 // If the architecture is right
1529 // but some other error took place - report os::lasterror(...) msg
1530 if (lib_arch == running_arch) {
1531 return NULL;
1532 }
1533
1534 if (lib_arch_str != NULL) {
1535 ::_snprintf(ebuf, ebuflen - 1,
1536 "Can't load %s-bit .dll on a %s-bit platform",
1537 lib_arch_str, running_arch_str);
1538 } else {
1539 // don't know what architecture this dll was build for
1540 ::_snprintf(ebuf, ebuflen - 1,
1541 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1542 lib_arch, running_arch_str);
1543 }
1544
1545 return NULL;
1546 }
1547
1548 void os::print_dll_info(outputStream *st) {
1549 st->print_cr("Dynamic libraries:");
1550 get_loaded_modules_info(_print_module, (void *)st);
1551 }
1552
1553 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1554 HANDLE hProcess;
1555
1556 # define MAX_NUM_MODULES 128
1557 HMODULE modules[MAX_NUM_MODULES];
1558 static char filename[MAX_PATH];
1559 int result = 0;
1560
1561 if (!os::PSApiDll::PSApiAvailable()) {
1562 return 0;
1563 }
1564
1565 int pid = os::current_process_id();
1566 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1567 FALSE, pid);
1568 if (hProcess == NULL) return 0;
1569
1570 DWORD size_needed;
1571 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1572 sizeof(modules), &size_needed)) {
1573 CloseHandle(hProcess);
1574 return 0;
1575 }
1576
1577 // number of modules that are currently loaded
1578 int num_modules = size_needed / sizeof(HMODULE);
1579
1580 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1581 // Get Full pathname:
1582 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1583 filename, sizeof(filename))) {
1584 filename[0] = '\0';
1585 }
1586
1587 MODULEINFO modinfo;
1588 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1589 &modinfo, sizeof(modinfo))) {
1590 modinfo.lpBaseOfDll = NULL;
1591 modinfo.SizeOfImage = 0;
1592 }
1593
1594 // Invoke callback function
1595 result = callback(filename, (address)modinfo.lpBaseOfDll,
1596 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1597 if (result) break;
1598 }
1599
1600 CloseHandle(hProcess);
1601 return result;
1602 }
1603
1604 void os::print_os_info_brief(outputStream* st) {
1605 os::print_os_info(st);
1606 }
1607
1608 void os::print_os_info(outputStream* st) {
1609 #ifdef ASSERT
1610 char buffer[1024];
1611 DWORD size = sizeof(buffer);
1612 st->print(" HostName: ");
1613 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1614 st->print("%s", buffer);
1615 } else {
1616 st->print("N/A");
1617 }
1618 #endif
1619 st->print(" OS:");
1620 os::win32::print_windows_version(st);
1621 }
1622
1623 void os::win32::print_windows_version(outputStream* st) {
1624 OSVERSIONINFOEX osvi;
1625 VS_FIXEDFILEINFO *file_info;
1626 TCHAR kernel32_path[MAX_PATH];
1627 UINT len, ret;
1628
1629 // Use the GetVersionEx information to see if we're on a server or
1630 // workstation edition of Windows. Starting with Windows 8.1 we can't
1631 // trust the OS version information returned by this API.
1632 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1633 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1634 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1635 st->print_cr("Call to GetVersionEx failed");
1636 return;
1637 }
1638 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1639
1640 // Get the full path to \Windows\System32\kernel32.dll and use that for
1641 // determining what version of Windows we're running on.
1642 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1643 ret = GetSystemDirectory(kernel32_path, len);
1644 if (ret == 0 || ret > len) {
1645 st->print_cr("Call to GetSystemDirectory failed");
1646 return;
1647 }
1648 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1649
1650 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1651 if (version_size == 0) {
1652 st->print_cr("Call to GetFileVersionInfoSize failed");
1653 return;
1654 }
1655
1656 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1657 if (version_info == NULL) {
1658 st->print_cr("Failed to allocate version_info");
1659 return;
1660 }
1661
1662 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1663 os::free(version_info);
1664 st->print_cr("Call to GetFileVersionInfo failed");
1665 return;
1666 }
1667
1668 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1669 os::free(version_info);
1670 st->print_cr("Call to VerQueryValue failed");
1671 return;
1672 }
1673
1674 int major_version = HIWORD(file_info->dwProductVersionMS);
1675 int minor_version = LOWORD(file_info->dwProductVersionMS);
1676 int build_number = HIWORD(file_info->dwProductVersionLS);
1677 int build_minor = LOWORD(file_info->dwProductVersionLS);
1678 int os_vers = major_version * 1000 + minor_version;
1679 os::free(version_info);
1680
1681 st->print(" Windows ");
1682 switch (os_vers) {
1683
1684 case 6000:
1685 if (is_workstation) {
1686 st->print("Vista");
1687 } else {
1688 st->print("Server 2008");
1689 }
1690 break;
1691
1692 case 6001:
1693 if (is_workstation) {
1694 st->print("7");
1695 } else {
1696 st->print("Server 2008 R2");
1697 }
1698 break;
1699
1700 case 6002:
1701 if (is_workstation) {
1702 st->print("8");
1703 } else {
1704 st->print("Server 2012");
1705 }
1706 break;
1707
1708 case 6003:
1709 if (is_workstation) {
1710 st->print("8.1");
1711 } else {
1712 st->print("Server 2012 R2");
1713 }
1714 break;
1715
1716 case 10000:
1717 if (is_workstation) {
1718 st->print("10");
1719 } else {
1720 // The server version name of Windows 10 is not known at this time
1721 st->print("%d.%d", major_version, minor_version);
1722 }
1723 break;
1724
1725 default:
1726 // Unrecognized windows, print out its major and minor versions
1727 st->print("%d.%d", major_version, minor_version);
1728 break;
1729 }
1730
1731 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1732 // find out whether we are running on 64 bit processor or not
1733 SYSTEM_INFO si;
1734 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1735 os::Kernel32Dll::GetNativeSystemInfo(&si);
1736 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1737 st->print(" , 64 bit");
1738 }
1739
1740 st->print(" Build %d", build_number);
1741 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1742 st->cr();
1743 }
1744
1745 void os::pd_print_cpu_info(outputStream* st) {
1746 // Nothing to do for now.
1747 }
1748
1749 void os::print_memory_info(outputStream* st) {
1750 st->print("Memory:");
1751 st->print(" %dk page", os::vm_page_size()>>10);
1752
1753 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1754 // value if total memory is larger than 4GB
1755 MEMORYSTATUSEX ms;
1756 ms.dwLength = sizeof(ms);
1757 GlobalMemoryStatusEx(&ms);
1758
1759 st->print(", physical %uk", os::physical_memory() >> 10);
1760 st->print("(%uk free)", os::available_memory() >> 10);
1761
1762 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1763 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1764 st->cr();
1765 }
1766
1767 void os::print_siginfo(outputStream *st, void *siginfo) {
1768 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1769 st->print("siginfo:");
1770 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1771
1772 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1773 er->NumberParameters >= 2) {
1774 switch (er->ExceptionInformation[0]) {
1775 case 0: st->print(", reading address"); break;
1776 case 1: st->print(", writing address"); break;
1777 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1778 er->ExceptionInformation[0]);
1779 }
1780 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1781 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1782 er->NumberParameters >= 2 && UseSharedSpaces) {
1783 FileMapInfo* mapinfo = FileMapInfo::current_info();
1784 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1785 st->print("\n\nError accessing class data sharing archive." \
1786 " Mapped file inaccessible during execution, " \
1787 " possible disk/network problem.");
1788 }
1789 } else {
1790 int num = er->NumberParameters;
1791 if (num > 0) {
1792 st->print(", ExceptionInformation=");
1793 for (int i = 0; i < num; i++) {
1794 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1795 }
1796 }
1797 }
1798 st->cr();
1799 }
1800
1801 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1802 // do nothing
1803 }
1804
1805 static char saved_jvm_path[MAX_PATH] = {0};
1806
1807 // Find the full path to the current module, jvm.dll
1808 void os::jvm_path(char *buf, jint buflen) {
1809 // Error checking.
1810 if (buflen < MAX_PATH) {
1811 assert(false, "must use a large-enough buffer");
1812 buf[0] = '\0';
1813 return;
1814 }
1815 // Lazy resolve the path to current module.
1816 if (saved_jvm_path[0] != 0) {
1817 strcpy(buf, saved_jvm_path);
1818 return;
1819 }
1820
1821 buf[0] = '\0';
1822 if (Arguments::sun_java_launcher_is_altjvm()) {
1823 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1824 // for a JAVA_HOME environment variable and fix up the path so it
1825 // looks like jvm.dll is installed there (append a fake suffix
1826 // hotspot/jvm.dll).
1827 char* java_home_var = ::getenv("JAVA_HOME");
1828 if (java_home_var != NULL && java_home_var[0] != 0 &&
1829 strlen(java_home_var) < (size_t)buflen) {
1830 strncpy(buf, java_home_var, buflen);
1831
1832 // determine if this is a legacy image or modules image
1833 // modules image doesn't have "jre" subdirectory
1834 size_t len = strlen(buf);
1835 char* jrebin_p = buf + len;
1836 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1837 if (0 != _access(buf, 0)) {
1838 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1839 }
1840 len = strlen(buf);
1841 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1842 }
1843 }
1844
1845 if (buf[0] == '\0') {
1846 GetModuleFileName(vm_lib_handle, buf, buflen);
1847 }
1848 strncpy(saved_jvm_path, buf, MAX_PATH);
1849 saved_jvm_path[MAX_PATH - 1] = '\0';
1850 }
1851
1852
1853 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1854 #ifndef _WIN64
1855 st->print("_");
1856 #endif
1857 }
1858
1859
1860 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1861 #ifndef _WIN64
1862 st->print("@%d", args_size * sizeof(int));
1863 #endif
1864 }
1865
1866 // This method is a copy of JDK's sysGetLastErrorString
1867 // from src/windows/hpi/src/system_md.c
1868
1869 size_t os::lasterror(char* buf, size_t len) {
1870 DWORD errval;
1871
1872 if ((errval = GetLastError()) != 0) {
1873 // DOS error
1874 size_t n = (size_t)FormatMessage(
1875 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1876 NULL,
1877 errval,
1878 0,
1879 buf,
1880 (DWORD)len,
1881 NULL);
1882 if (n > 3) {
1883 // Drop final '.', CR, LF
1884 if (buf[n - 1] == '\n') n--;
1885 if (buf[n - 1] == '\r') n--;
1886 if (buf[n - 1] == '.') n--;
1887 buf[n] = '\0';
1888 }
1889 return n;
1890 }
1891
1892 if (errno != 0) {
1893 // C runtime error that has no corresponding DOS error code
1894 const char* s = strerror(errno);
1895 size_t n = strlen(s);
1896 if (n >= len) n = len - 1;
1897 strncpy(buf, s, n);
1898 buf[n] = '\0';
1899 return n;
1900 }
1901
1902 return 0;
1903 }
1904
1905 int os::get_last_error() {
1906 DWORD error = GetLastError();
1907 if (error == 0) {
1908 error = errno;
1909 }
1910 return (int)error;
1911 }
1912
1913 // sun.misc.Signal
1914 // NOTE that this is a workaround for an apparent kernel bug where if
1915 // a signal handler for SIGBREAK is installed then that signal handler
1916 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1917 // See bug 4416763.
1918 static void (*sigbreakHandler)(int) = NULL;
1919
1920 static void UserHandler(int sig, void *siginfo, void *context) {
1921 os::signal_notify(sig);
1922 // We need to reinstate the signal handler each time...
1923 os::signal(sig, (void*)UserHandler);
1924 }
1925
1926 void* os::user_handler() {
1927 return (void*) UserHandler;
1928 }
1929
1930 void* os::signal(int signal_number, void* handler) {
1931 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1932 void (*oldHandler)(int) = sigbreakHandler;
1933 sigbreakHandler = (void (*)(int)) handler;
1934 return (void*) oldHandler;
1935 } else {
1936 return (void*)::signal(signal_number, (void (*)(int))handler);
1937 }
1938 }
1939
1940 void os::signal_raise(int signal_number) {
1941 raise(signal_number);
1942 }
1943
1944 // The Win32 C runtime library maps all console control events other than ^C
1945 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1946 // logoff, and shutdown events. We therefore install our own console handler
1947 // that raises SIGTERM for the latter cases.
1948 //
1949 static BOOL WINAPI consoleHandler(DWORD event) {
1950 switch (event) {
1951 case CTRL_C_EVENT:
1952 if (is_error_reported()) {
1953 // Ctrl-C is pressed during error reporting, likely because the error
1954 // handler fails to abort. Let VM die immediately.
1955 os::die();
1956 }
1957
1958 os::signal_raise(SIGINT);
1959 return TRUE;
1960 break;
1961 case CTRL_BREAK_EVENT:
1962 if (sigbreakHandler != NULL) {
1963 (*sigbreakHandler)(SIGBREAK);
1964 }
1965 return TRUE;
1966 break;
1967 case CTRL_LOGOFF_EVENT: {
1968 // Don't terminate JVM if it is running in a non-interactive session,
1969 // such as a service process.
1970 USEROBJECTFLAGS flags;
1971 HANDLE handle = GetProcessWindowStation();
1972 if (handle != NULL &&
1973 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1974 sizeof(USEROBJECTFLAGS), NULL)) {
1975 // If it is a non-interactive session, let next handler to deal
1976 // with it.
1977 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1978 return FALSE;
1979 }
1980 }
1981 }
1982 case CTRL_CLOSE_EVENT:
1983 case CTRL_SHUTDOWN_EVENT:
1984 os::signal_raise(SIGTERM);
1985 return TRUE;
1986 break;
1987 default:
1988 break;
1989 }
1990 return FALSE;
1991 }
1992
1993 // The following code is moved from os.cpp for making this
1994 // code platform specific, which it is by its very nature.
1995
1996 // Return maximum OS signal used + 1 for internal use only
1997 // Used as exit signal for signal_thread
1998 int os::sigexitnum_pd() {
1999 return NSIG;
2000 }
2001
2002 // a counter for each possible signal value, including signal_thread exit signal
2003 static volatile jint pending_signals[NSIG+1] = { 0 };
2004 static HANDLE sig_sem = NULL;
2005
2006 void os::signal_init_pd() {
2007 // Initialize signal structures
2008 memset((void*)pending_signals, 0, sizeof(pending_signals));
2009
2010 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2011
2012 // Programs embedding the VM do not want it to attempt to receive
2013 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2014 // shutdown hooks mechanism introduced in 1.3. For example, when
2015 // the VM is run as part of a Windows NT service (i.e., a servlet
2016 // engine in a web server), the correct behavior is for any console
2017 // control handler to return FALSE, not TRUE, because the OS's
2018 // "final" handler for such events allows the process to continue if
2019 // it is a service (while terminating it if it is not a service).
2020 // To make this behavior uniform and the mechanism simpler, we
2021 // completely disable the VM's usage of these console events if -Xrs
2022 // (=ReduceSignalUsage) is specified. This means, for example, that
2023 // the CTRL-BREAK thread dump mechanism is also disabled in this
2024 // case. See bugs 4323062, 4345157, and related bugs.
2025
2026 if (!ReduceSignalUsage) {
2027 // Add a CTRL-C handler
2028 SetConsoleCtrlHandler(consoleHandler, TRUE);
2029 }
2030 }
2031
2032 void os::signal_notify(int signal_number) {
2033 BOOL ret;
2034 if (sig_sem != NULL) {
2035 Atomic::inc(&pending_signals[signal_number]);
2036 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2037 assert(ret != 0, "ReleaseSemaphore() failed");
2038 }
2039 }
2040
2041 static int check_pending_signals(bool wait_for_signal) {
2042 DWORD ret;
2043 while (true) {
2044 for (int i = 0; i < NSIG + 1; i++) {
2045 jint n = pending_signals[i];
2046 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2047 return i;
2048 }
2049 }
2050 if (!wait_for_signal) {
2051 return -1;
2052 }
2053
2054 JavaThread *thread = JavaThread::current();
2055
2056 ThreadBlockInVM tbivm(thread);
2057
2058 bool threadIsSuspended;
2059 do {
2060 thread->set_suspend_equivalent();
2061 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2062 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2063 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2064
2065 // were we externally suspended while we were waiting?
2066 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2067 if (threadIsSuspended) {
2068 // The semaphore has been incremented, but while we were waiting
2069 // another thread suspended us. We don't want to continue running
2070 // while suspended because that would surprise the thread that
2071 // suspended us.
2072 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2073 assert(ret != 0, "ReleaseSemaphore() failed");
2074
2075 thread->java_suspend_self();
2076 }
2077 } while (threadIsSuspended);
2078 }
2079 }
2080
2081 int os::signal_lookup() {
2082 return check_pending_signals(false);
2083 }
2084
2085 int os::signal_wait() {
2086 return check_pending_signals(true);
2087 }
2088
2089 // Implicit OS exception handling
2090
2091 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2092 address handler) {
2093 JavaThread* thread = JavaThread::current();
2094 // Save pc in thread
2095 #ifdef _M_IA64
2096 // Do not blow up if no thread info available.
2097 if (thread) {
2098 // Saving PRECISE pc (with slot information) in thread.
2099 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2100 // Convert precise PC into "Unix" format
2101 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2102 thread->set_saved_exception_pc((address)precise_pc);
2103 }
2104 // Set pc to handler
2105 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2106 // Clear out psr.ri (= Restart Instruction) in order to continue
2107 // at the beginning of the target bundle.
2108 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2109 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2110 #elif _M_AMD64
2111 // Do not blow up if no thread info available.
2112 if (thread) {
2113 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2114 }
2115 // Set pc to handler
2116 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2117 #else
2118 // Do not blow up if no thread info available.
2119 if (thread) {
2120 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2121 }
2122 // Set pc to handler
2123 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2124 #endif
2125
2126 // Continue the execution
2127 return EXCEPTION_CONTINUE_EXECUTION;
2128 }
2129
2130
2131 // Used for PostMortemDump
2132 extern "C" void safepoints();
2133 extern "C" void find(int x);
2134 extern "C" void events();
2135
2136 // According to Windows API documentation, an illegal instruction sequence should generate
2137 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2138 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2139 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2140
2141 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2142
2143 // From "Execution Protection in the Windows Operating System" draft 0.35
2144 // Once a system header becomes available, the "real" define should be
2145 // included or copied here.
2146 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2147
2148 // Handle NAT Bit consumption on IA64.
2149 #ifdef _M_IA64
2150 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2151 #endif
2152
2153 // Windows Vista/2008 heap corruption check
2154 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2155
2156 #define def_excpt(val) #val, val
2157
2158 struct siglabel {
2159 char *name;
2160 int number;
2161 };
2162
2163 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2164 // C++ compiler contain this error code. Because this is a compiler-generated
2165 // error, the code is not listed in the Win32 API header files.
2166 // The code is actually a cryptic mnemonic device, with the initial "E"
2167 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2168 // ASCII values of "msc".
2169
2170 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2171
2172
2173 struct siglabel exceptlabels[] = {
2174 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2175 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2176 def_excpt(EXCEPTION_BREAKPOINT),
2177 def_excpt(EXCEPTION_SINGLE_STEP),
2178 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2179 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2180 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2181 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2182 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2183 def_excpt(EXCEPTION_FLT_OVERFLOW),
2184 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2185 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2186 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2187 def_excpt(EXCEPTION_INT_OVERFLOW),
2188 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2189 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2191 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2192 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2193 def_excpt(EXCEPTION_STACK_OVERFLOW),
2194 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2195 def_excpt(EXCEPTION_GUARD_PAGE),
2196 def_excpt(EXCEPTION_INVALID_HANDLE),
2197 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2198 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2199 #ifdef _M_IA64
2200 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2201 #endif
2202 NULL, 0
2203 };
2204
2205 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2206 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2207 if (exceptlabels[i].number == exception_code) {
2208 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2209 return buf;
2210 }
2211 }
2212
2213 return NULL;
2214 }
2215
2216 //-----------------------------------------------------------------------------
2217 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2218 // handle exception caused by idiv; should only happen for -MinInt/-1
2219 // (division by zero is handled explicitly)
2220 #ifdef _M_IA64
2221 assert(0, "Fix Handle_IDiv_Exception");
2222 #elif _M_AMD64
2223 PCONTEXT ctx = exceptionInfo->ContextRecord;
2224 address pc = (address)ctx->Rip;
2225 assert(pc[0] == 0xF7, "not an idiv opcode");
2226 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2227 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2228 // set correct result values and continue after idiv instruction
2229 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2230 ctx->Rax = (DWORD)min_jint; // result
2231 ctx->Rdx = (DWORD)0; // remainder
2232 // Continue the execution
2233 #else
2234 PCONTEXT ctx = exceptionInfo->ContextRecord;
2235 address pc = (address)ctx->Eip;
2236 assert(pc[0] == 0xF7, "not an idiv opcode");
2237 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2238 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2239 // set correct result values and continue after idiv instruction
2240 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2241 ctx->Eax = (DWORD)min_jint; // result
2242 ctx->Edx = (DWORD)0; // remainder
2243 // Continue the execution
2244 #endif
2245 return EXCEPTION_CONTINUE_EXECUTION;
2246 }
2247
2248 //-----------------------------------------------------------------------------
2249 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2250 PCONTEXT ctx = exceptionInfo->ContextRecord;
2251 #ifndef _WIN64
2252 // handle exception caused by native method modifying control word
2253 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2254
2255 switch (exception_code) {
2256 case EXCEPTION_FLT_DENORMAL_OPERAND:
2257 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2258 case EXCEPTION_FLT_INEXACT_RESULT:
2259 case EXCEPTION_FLT_INVALID_OPERATION:
2260 case EXCEPTION_FLT_OVERFLOW:
2261 case EXCEPTION_FLT_STACK_CHECK:
2262 case EXCEPTION_FLT_UNDERFLOW:
2263 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2264 if (fp_control_word != ctx->FloatSave.ControlWord) {
2265 // Restore FPCW and mask out FLT exceptions
2266 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2267 // Mask out pending FLT exceptions
2268 ctx->FloatSave.StatusWord &= 0xffffff00;
2269 return EXCEPTION_CONTINUE_EXECUTION;
2270 }
2271 }
2272
2273 if (prev_uef_handler != NULL) {
2274 // We didn't handle this exception so pass it to the previous
2275 // UnhandledExceptionFilter.
2276 return (prev_uef_handler)(exceptionInfo);
2277 }
2278 #else // !_WIN64
2279 // On Windows, the mxcsr control bits are non-volatile across calls
2280 // See also CR 6192333
2281 //
2282 jint MxCsr = INITIAL_MXCSR;
2283 // we can't use StubRoutines::addr_mxcsr_std()
2284 // because in Win64 mxcsr is not saved there
2285 if (MxCsr != ctx->MxCsr) {
2286 ctx->MxCsr = MxCsr;
2287 return EXCEPTION_CONTINUE_EXECUTION;
2288 }
2289 #endif // !_WIN64
2290
2291 return EXCEPTION_CONTINUE_SEARCH;
2292 }
2293
2294 static inline void report_error(Thread* t, DWORD exception_code,
2295 address addr, void* siginfo, void* context) {
2296 VMError err(t, exception_code, addr, siginfo, context);
2297 err.report_and_die();
2298
2299 // If UseOsErrorReporting, this will return here and save the error file
2300 // somewhere where we can find it in the minidump.
2301 }
2302
2303 //-----------------------------------------------------------------------------
2304 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2305 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2306 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2307 #ifdef _M_IA64
2308 // On Itanium, we need the "precise pc", which has the slot number coded
2309 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2310 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2311 // Convert the pc to "Unix format", which has the slot number coded
2312 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2313 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2314 // information is saved in the Unix format.
2315 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2316 #elif _M_AMD64
2317 address pc = (address) exceptionInfo->ContextRecord->Rip;
2318 #else
2319 address pc = (address) exceptionInfo->ContextRecord->Eip;
2320 #endif
2321 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2322
2323 // Handle SafeFetch32 and SafeFetchN exceptions.
2324 if (StubRoutines::is_safefetch_fault(pc)) {
2325 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2326 }
2327
2328 #ifndef _WIN64
2329 // Execution protection violation - win32 running on AMD64 only
2330 // Handled first to avoid misdiagnosis as a "normal" access violation;
2331 // This is safe to do because we have a new/unique ExceptionInformation
2332 // code for this condition.
2333 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2334 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2335 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2336 address addr = (address) exceptionRecord->ExceptionInformation[1];
2337
2338 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2339 int page_size = os::vm_page_size();
2340
2341 // Make sure the pc and the faulting address are sane.
2342 //
2343 // If an instruction spans a page boundary, and the page containing
2344 // the beginning of the instruction is executable but the following
2345 // page is not, the pc and the faulting address might be slightly
2346 // different - we still want to unguard the 2nd page in this case.
2347 //
2348 // 15 bytes seems to be a (very) safe value for max instruction size.
2349 bool pc_is_near_addr =
2350 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2351 bool instr_spans_page_boundary =
2352 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2353 (intptr_t) page_size) > 0);
2354
2355 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2356 static volatile address last_addr =
2357 (address) os::non_memory_address_word();
2358
2359 // In conservative mode, don't unguard unless the address is in the VM
2360 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2361 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2362
2363 // Set memory to RWX and retry
2364 address page_start =
2365 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2366 bool res = os::protect_memory((char*) page_start, page_size,
2367 os::MEM_PROT_RWX);
2368
2369 if (PrintMiscellaneous && Verbose) {
2370 char buf[256];
2371 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2372 "at " INTPTR_FORMAT
2373 ", unguarding " INTPTR_FORMAT ": %s", addr,
2374 page_start, (res ? "success" : strerror(errno)));
2375 tty->print_raw_cr(buf);
2376 }
2377
2378 // Set last_addr so if we fault again at the same address, we don't
2379 // end up in an endless loop.
2380 //
2381 // There are two potential complications here. Two threads trapping
2382 // at the same address at the same time could cause one of the
2383 // threads to think it already unguarded, and abort the VM. Likely
2384 // very rare.
2385 //
2386 // The other race involves two threads alternately trapping at
2387 // different addresses and failing to unguard the page, resulting in
2388 // an endless loop. This condition is probably even more unlikely
2389 // than the first.
2390 //
2391 // Although both cases could be avoided by using locks or thread
2392 // local last_addr, these solutions are unnecessary complication:
2393 // this handler is a best-effort safety net, not a complete solution.
2394 // It is disabled by default and should only be used as a workaround
2395 // in case we missed any no-execute-unsafe VM code.
2396
2397 last_addr = addr;
2398
2399 return EXCEPTION_CONTINUE_EXECUTION;
2400 }
2401 }
2402
2403 // Last unguard failed or not unguarding
2404 tty->print_raw_cr("Execution protection violation");
2405 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2406 exceptionInfo->ContextRecord);
2407 return EXCEPTION_CONTINUE_SEARCH;
2408 }
2409 }
2410 #endif // _WIN64
2411
2412 // Check to see if we caught the safepoint code in the
2413 // process of write protecting the memory serialization page.
2414 // It write enables the page immediately after protecting it
2415 // so just return.
2416 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2417 JavaThread* thread = (JavaThread*) t;
2418 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2419 address addr = (address) exceptionRecord->ExceptionInformation[1];
2420 if (os::is_memory_serialize_page(thread, addr)) {
2421 // Block current thread until the memory serialize page permission restored.
2422 os::block_on_serialize_page_trap();
2423 return EXCEPTION_CONTINUE_EXECUTION;
2424 }
2425 }
2426
2427 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2428 VM_Version::is_cpuinfo_segv_addr(pc)) {
2429 // Verify that OS save/restore AVX registers.
2430 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2431 }
2432
2433 if (t != NULL && t->is_Java_thread()) {
2434 JavaThread* thread = (JavaThread*) t;
2435 bool in_java = thread->thread_state() == _thread_in_Java;
2436
2437 // Handle potential stack overflows up front.
2438 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2439 if (os::uses_stack_guard_pages()) {
2440 #ifdef _M_IA64
2441 // Use guard page for register stack.
2442 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2443 address addr = (address) exceptionRecord->ExceptionInformation[1];
2444 // Check for a register stack overflow on Itanium
2445 if (thread->addr_inside_register_stack_red_zone(addr)) {
2446 // Fatal red zone violation happens if the Java program
2447 // catches a StackOverflow error and does so much processing
2448 // that it runs beyond the unprotected yellow guard zone. As
2449 // a result, we are out of here.
2450 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2451 } else if(thread->addr_inside_register_stack(addr)) {
2452 // Disable the yellow zone which sets the state that
2453 // we've got a stack overflow problem.
2454 if (thread->stack_yellow_zone_enabled()) {
2455 thread->disable_stack_yellow_zone();
2456 }
2457 // Give us some room to process the exception.
2458 thread->disable_register_stack_guard();
2459 // Tracing with +Verbose.
2460 if (Verbose) {
2461 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2462 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2463 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2464 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2465 thread->register_stack_base(),
2466 thread->register_stack_base() + thread->stack_size());
2467 }
2468
2469 // Reguard the permanent register stack red zone just to be sure.
2470 // We saw Windows silently disabling this without telling us.
2471 thread->enable_register_stack_red_zone();
2472
2473 return Handle_Exception(exceptionInfo,
2474 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2475 }
2476 #endif
2477 if (thread->stack_yellow_zone_enabled()) {
2478 // Yellow zone violation. The o/s has unprotected the first yellow
2479 // zone page for us. Note: must call disable_stack_yellow_zone to
2480 // update the enabled status, even if the zone contains only one page.
2481 thread->disable_stack_yellow_zone();
2482 // If not in java code, return and hope for the best.
2483 return in_java
2484 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2485 : EXCEPTION_CONTINUE_EXECUTION;
2486 } else {
2487 // Fatal red zone violation.
2488 thread->disable_stack_red_zone();
2489 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2490 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2491 exceptionInfo->ContextRecord);
2492 return EXCEPTION_CONTINUE_SEARCH;
2493 }
2494 } else if (in_java) {
2495 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2496 // a one-time-only guard page, which it has released to us. The next
2497 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2498 return Handle_Exception(exceptionInfo,
2499 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2500 } else {
2501 // Can only return and hope for the best. Further stack growth will
2502 // result in an ACCESS_VIOLATION.
2503 return EXCEPTION_CONTINUE_EXECUTION;
2504 }
2505 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2506 // Either stack overflow or null pointer exception.
2507 if (in_java) {
2508 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2509 address addr = (address) exceptionRecord->ExceptionInformation[1];
2510 address stack_end = thread->stack_base() - thread->stack_size();
2511 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2512 // Stack overflow.
2513 assert(!os::uses_stack_guard_pages(),
2514 "should be caught by red zone code above.");
2515 return Handle_Exception(exceptionInfo,
2516 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2517 }
2518 // Check for safepoint polling and implicit null
2519 // We only expect null pointers in the stubs (vtable)
2520 // the rest are checked explicitly now.
2521 CodeBlob* cb = CodeCache::find_blob(pc);
2522 if (cb != NULL) {
2523 if (os::is_poll_address(addr)) {
2524 address stub = SharedRuntime::get_poll_stub(pc);
2525 return Handle_Exception(exceptionInfo, stub);
2526 }
2527 }
2528 {
2529 #ifdef _WIN64
2530 // If it's a legal stack address map the entire region in
2531 //
2532 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2533 address addr = (address) exceptionRecord->ExceptionInformation[1];
2534 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2535 addr = (address)((uintptr_t)addr &
2536 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2537 os::commit_memory((char *)addr, thread->stack_base() - addr,
2538 !ExecMem);
2539 return EXCEPTION_CONTINUE_EXECUTION;
2540 } else
2541 #endif
2542 {
2543 // Null pointer exception.
2544 #ifdef _M_IA64
2545 // Process implicit null checks in compiled code. Note: Implicit null checks
2546 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2547 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2548 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2549 // Handle implicit null check in UEP method entry
2550 if (cb && (cb->is_frame_complete_at(pc) ||
2551 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2552 if (Verbose) {
2553 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2554 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2555 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2556 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2557 *(bundle_start + 1), *bundle_start);
2558 }
2559 return Handle_Exception(exceptionInfo,
2560 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2561 }
2562 }
2563
2564 // Implicit null checks were processed above. Hence, we should not reach
2565 // here in the usual case => die!
2566 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2567 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2568 exceptionInfo->ContextRecord);
2569 return EXCEPTION_CONTINUE_SEARCH;
2570
2571 #else // !IA64
2572
2573 // Windows 98 reports faulting addresses incorrectly
2574 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2575 !os::win32::is_nt()) {
2576 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2577 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2578 }
2579 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2580 exceptionInfo->ContextRecord);
2581 return EXCEPTION_CONTINUE_SEARCH;
2582 #endif
2583 }
2584 }
2585 }
2586
2587 #ifdef _WIN64
2588 // Special care for fast JNI field accessors.
2589 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2590 // in and the heap gets shrunk before the field access.
2591 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2592 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2593 if (addr != (address)-1) {
2594 return Handle_Exception(exceptionInfo, addr);
2595 }
2596 }
2597 #endif
2598
2599 // Stack overflow or null pointer exception in native code.
2600 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2601 exceptionInfo->ContextRecord);
2602 return EXCEPTION_CONTINUE_SEARCH;
2603 } // /EXCEPTION_ACCESS_VIOLATION
2604 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2605 #if defined _M_IA64
2606 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2607 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2608 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2609
2610 // Compiled method patched to be non entrant? Following conditions must apply:
2611 // 1. must be first instruction in bundle
2612 // 2. must be a break instruction with appropriate code
2613 if ((((uint64_t) pc & 0x0F) == 0) &&
2614 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2615 return Handle_Exception(exceptionInfo,
2616 (address)SharedRuntime::get_handle_wrong_method_stub());
2617 }
2618 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2619 #endif
2620
2621
2622 if (in_java) {
2623 switch (exception_code) {
2624 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2625 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2626
2627 case EXCEPTION_INT_OVERFLOW:
2628 return Handle_IDiv_Exception(exceptionInfo);
2629
2630 } // switch
2631 }
2632 if (((thread->thread_state() == _thread_in_Java) ||
2633 (thread->thread_state() == _thread_in_native)) &&
2634 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2635 LONG result=Handle_FLT_Exception(exceptionInfo);
2636 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2637 }
2638 }
2639
2640 if (exception_code != EXCEPTION_BREAKPOINT) {
2641 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2642 exceptionInfo->ContextRecord);
2643 }
2644 return EXCEPTION_CONTINUE_SEARCH;
2645 }
2646
2647 #ifndef _WIN64
2648 // Special care for fast JNI accessors.
2649 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2650 // the heap gets shrunk before the field access.
2651 // Need to install our own structured exception handler since native code may
2652 // install its own.
2653 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2654 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2655 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2656 address pc = (address) exceptionInfo->ContextRecord->Eip;
2657 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2658 if (addr != (address)-1) {
2659 return Handle_Exception(exceptionInfo, addr);
2660 }
2661 }
2662 return EXCEPTION_CONTINUE_SEARCH;
2663 }
2664
2665 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2666 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2667 jobject obj, \
2668 jfieldID fieldID) { \
2669 __try { \
2670 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2671 obj, \
2672 fieldID); \
2673 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2674 _exception_info())) { \
2675 } \
2676 return 0; \
2677 }
2678
2679 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2680 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2681 DEFINE_FAST_GETFIELD(jchar, char, Char)
2682 DEFINE_FAST_GETFIELD(jshort, short, Short)
2683 DEFINE_FAST_GETFIELD(jint, int, Int)
2684 DEFINE_FAST_GETFIELD(jlong, long, Long)
2685 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2686 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2687
2688 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2689 switch (type) {
2690 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2691 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2692 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2693 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2694 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2695 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2696 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2697 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2698 default: ShouldNotReachHere();
2699 }
2700 return (address)-1;
2701 }
2702 #endif
2703
2704 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2705 // Install a win32 structured exception handler around the test
2706 // function call so the VM can generate an error dump if needed.
2707 __try {
2708 (*funcPtr)();
2709 } __except(topLevelExceptionFilter(
2710 (_EXCEPTION_POINTERS*)_exception_info())) {
2711 // Nothing to do.
2712 }
2713 }
2714
2715 // Virtual Memory
2716
2717 int os::vm_page_size() { return os::win32::vm_page_size(); }
2718 int os::vm_allocation_granularity() {
2719 return os::win32::vm_allocation_granularity();
2720 }
2721
2722 // Windows large page support is available on Windows 2003. In order to use
2723 // large page memory, the administrator must first assign additional privilege
2724 // to the user:
2725 // + select Control Panel -> Administrative Tools -> Local Security Policy
2726 // + select Local Policies -> User Rights Assignment
2727 // + double click "Lock pages in memory", add users and/or groups
2728 // + reboot
2729 // Note the above steps are needed for administrator as well, as administrators
2730 // by default do not have the privilege to lock pages in memory.
2731 //
2732 // Note about Windows 2003: although the API supports committing large page
2733 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2734 // scenario, I found through experiment it only uses large page if the entire
2735 // memory region is reserved and committed in a single VirtualAlloc() call.
2736 // This makes Windows large page support more or less like Solaris ISM, in
2737 // that the entire heap must be committed upfront. This probably will change
2738 // in the future, if so the code below needs to be revisited.
2739
2740 #ifndef MEM_LARGE_PAGES
2741 #define MEM_LARGE_PAGES 0x20000000
2742 #endif
2743
2744 static HANDLE _hProcess;
2745 static HANDLE _hToken;
2746
2747 // Container for NUMA node list info
2748 class NUMANodeListHolder {
2749 private:
2750 int *_numa_used_node_list; // allocated below
2751 int _numa_used_node_count;
2752
2753 void free_node_list() {
2754 if (_numa_used_node_list != NULL) {
2755 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2756 }
2757 }
2758
2759 public:
2760 NUMANodeListHolder() {
2761 _numa_used_node_count = 0;
2762 _numa_used_node_list = NULL;
2763 // do rest of initialization in build routine (after function pointers are set up)
2764 }
2765
2766 ~NUMANodeListHolder() {
2767 free_node_list();
2768 }
2769
2770 bool build() {
2771 DWORD_PTR proc_aff_mask;
2772 DWORD_PTR sys_aff_mask;
2773 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2774 ULONG highest_node_number;
2775 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2776 free_node_list();
2777 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2778 for (unsigned int i = 0; i <= highest_node_number; i++) {
2779 ULONGLONG proc_mask_numa_node;
2780 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2781 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2782 _numa_used_node_list[_numa_used_node_count++] = i;
2783 }
2784 }
2785 return (_numa_used_node_count > 1);
2786 }
2787
2788 int get_count() { return _numa_used_node_count; }
2789 int get_node_list_entry(int n) {
2790 // for indexes out of range, returns -1
2791 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2792 }
2793
2794 } numa_node_list_holder;
2795
2796
2797
2798 static size_t _large_page_size = 0;
2799
2800 static bool resolve_functions_for_large_page_init() {
2801 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2802 os::Advapi32Dll::AdvapiAvailable();
2803 }
2804
2805 static bool request_lock_memory_privilege() {
2806 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2807 os::current_process_id());
2808
2809 LUID luid;
2810 if (_hProcess != NULL &&
2811 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2812 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2813
2814 TOKEN_PRIVILEGES tp;
2815 tp.PrivilegeCount = 1;
2816 tp.Privileges[0].Luid = luid;
2817 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2818
2819 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2820 // privilege. Check GetLastError() too. See MSDN document.
2821 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2822 (GetLastError() == ERROR_SUCCESS)) {
2823 return true;
2824 }
2825 }
2826
2827 return false;
2828 }
2829
2830 static void cleanup_after_large_page_init() {
2831 if (_hProcess) CloseHandle(_hProcess);
2832 _hProcess = NULL;
2833 if (_hToken) CloseHandle(_hToken);
2834 _hToken = NULL;
2835 }
2836
2837 static bool numa_interleaving_init() {
2838 bool success = false;
2839 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2840
2841 // print a warning if UseNUMAInterleaving flag is specified on command line
2842 bool warn_on_failure = use_numa_interleaving_specified;
2843 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2844
2845 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2846 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2847 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2848
2849 if (os::Kernel32Dll::NumaCallsAvailable()) {
2850 if (numa_node_list_holder.build()) {
2851 if (PrintMiscellaneous && Verbose) {
2852 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2853 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2854 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2855 }
2856 tty->print("\n");
2857 }
2858 success = true;
2859 } else {
2860 WARN("Process does not cover multiple NUMA nodes.");
2861 }
2862 } else {
2863 WARN("NUMA Interleaving is not supported by the operating system.");
2864 }
2865 if (!success) {
2866 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2867 }
2868 return success;
2869 #undef WARN
2870 }
2871
2872 // this routine is used whenever we need to reserve a contiguous VA range
2873 // but we need to make separate VirtualAlloc calls for each piece of the range
2874 // Reasons for doing this:
2875 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2876 // * UseNUMAInterleaving requires a separate node for each piece
2877 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2878 DWORD prot,
2879 bool should_inject_error = false) {
2880 char * p_buf;
2881 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2882 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2883 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2884
2885 // first reserve enough address space in advance since we want to be
2886 // able to break a single contiguous virtual address range into multiple
2887 // large page commits but WS2003 does not allow reserving large page space
2888 // so we just use 4K pages for reserve, this gives us a legal contiguous
2889 // address space. then we will deallocate that reservation, and re alloc
2890 // using large pages
2891 const size_t size_of_reserve = bytes + chunk_size;
2892 if (bytes > size_of_reserve) {
2893 // Overflowed.
2894 return NULL;
2895 }
2896 p_buf = (char *) VirtualAlloc(addr,
2897 size_of_reserve, // size of Reserve
2898 MEM_RESERVE,
2899 PAGE_READWRITE);
2900 // If reservation failed, return NULL
2901 if (p_buf == NULL) return NULL;
2902 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2903 os::release_memory(p_buf, bytes + chunk_size);
2904
2905 // we still need to round up to a page boundary (in case we are using large pages)
2906 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2907 // instead we handle this in the bytes_to_rq computation below
2908 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2909
2910 // now go through and allocate one chunk at a time until all bytes are
2911 // allocated
2912 size_t bytes_remaining = bytes;
2913 // An overflow of align_size_up() would have been caught above
2914 // in the calculation of size_of_reserve.
2915 char * next_alloc_addr = p_buf;
2916 HANDLE hProc = GetCurrentProcess();
2917
2918 #ifdef ASSERT
2919 // Variable for the failure injection
2920 long ran_num = os::random();
2921 size_t fail_after = ran_num % bytes;
2922 #endif
2923
2924 int count=0;
2925 while (bytes_remaining) {
2926 // select bytes_to_rq to get to the next chunk_size boundary
2927
2928 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2929 // Note allocate and commit
2930 char * p_new;
2931
2932 #ifdef ASSERT
2933 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2934 #else
2935 const bool inject_error_now = false;
2936 #endif
2937
2938 if (inject_error_now) {
2939 p_new = NULL;
2940 } else {
2941 if (!UseNUMAInterleaving) {
2942 p_new = (char *) VirtualAlloc(next_alloc_addr,
2943 bytes_to_rq,
2944 flags,
2945 prot);
2946 } else {
2947 // get the next node to use from the used_node_list
2948 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2949 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2950 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2951 next_alloc_addr,
2952 bytes_to_rq,
2953 flags,
2954 prot,
2955 node);
2956 }
2957 }
2958
2959 if (p_new == NULL) {
2960 // Free any allocated pages
2961 if (next_alloc_addr > p_buf) {
2962 // Some memory was committed so release it.
2963 size_t bytes_to_release = bytes - bytes_remaining;
2964 // NMT has yet to record any individual blocks, so it
2965 // need to create a dummy 'reserve' record to match
2966 // the release.
2967 MemTracker::record_virtual_memory_reserve((address)p_buf,
2968 bytes_to_release, CALLER_PC);
2969 os::release_memory(p_buf, bytes_to_release);
2970 }
2971 #ifdef ASSERT
2972 if (should_inject_error) {
2973 if (TracePageSizes && Verbose) {
2974 tty->print_cr("Reserving pages individually failed.");
2975 }
2976 }
2977 #endif
2978 return NULL;
2979 }
2980
2981 bytes_remaining -= bytes_to_rq;
2982 next_alloc_addr += bytes_to_rq;
2983 count++;
2984 }
2985 // Although the memory is allocated individually, it is returned as one.
2986 // NMT records it as one block.
2987 if ((flags & MEM_COMMIT) != 0) {
2988 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2989 } else {
2990 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2991 }
2992
2993 // made it this far, success
2994 return p_buf;
2995 }
2996
2997
2998
2999 void os::large_page_init() {
3000 if (!UseLargePages) return;
3001
3002 // print a warning if any large page related flag is specified on command line
3003 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3004 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3005 bool success = false;
3006
3007 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3008 if (resolve_functions_for_large_page_init()) {
3009 if (request_lock_memory_privilege()) {
3010 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3011 if (s) {
3012 #if defined(IA32) || defined(AMD64)
3013 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3014 WARN("JVM cannot use large pages bigger than 4mb.");
3015 } else {
3016 #endif
3017 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3018 _large_page_size = LargePageSizeInBytes;
3019 } else {
3020 _large_page_size = s;
3021 }
3022 success = true;
3023 #if defined(IA32) || defined(AMD64)
3024 }
3025 #endif
3026 } else {
3027 WARN("Large page is not supported by the processor.");
3028 }
3029 } else {
3030 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3031 }
3032 } else {
3033 WARN("Large page is not supported by the operating system.");
3034 }
3035 #undef WARN
3036
3037 const size_t default_page_size = (size_t) vm_page_size();
3038 if (success && _large_page_size > default_page_size) {
3039 _page_sizes[0] = _large_page_size;
3040 _page_sizes[1] = default_page_size;
3041 _page_sizes[2] = 0;
3042 }
3043
3044 cleanup_after_large_page_init();
3045 UseLargePages = success;
3046 }
3047
3048 // On win32, one cannot release just a part of reserved memory, it's an
3049 // all or nothing deal. When we split a reservation, we must break the
3050 // reservation into two reservations.
3051 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3052 bool realloc) {
3053 if (size > 0) {
3054 release_memory(base, size);
3055 if (realloc) {
3056 reserve_memory(split, base);
3057 }
3058 if (size != split) {
3059 reserve_memory(size - split, base + split);
3060 }
3061 }
3062 }
3063
3064 // Multiple threads can race in this code but it's not possible to unmap small sections of
3065 // virtual space to get requested alignment, like posix-like os's.
3066 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3067 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3068 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3069 "Alignment must be a multiple of allocation granularity (page size)");
3070 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3071
3072 size_t extra_size = size + alignment;
3073 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3074
3075 char* aligned_base = NULL;
3076
3077 do {
3078 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3079 if (extra_base == NULL) {
3080 return NULL;
3081 }
3082 // Do manual alignment
3083 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3084
3085 os::release_memory(extra_base, extra_size);
3086
3087 aligned_base = os::reserve_memory(size, aligned_base);
3088
3089 } while (aligned_base == NULL);
3090
3091 return aligned_base;
3092 }
3093
3094 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3095 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3096 "reserve alignment");
3097 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3098 char* res;
3099 // note that if UseLargePages is on, all the areas that require interleaving
3100 // will go thru reserve_memory_special rather than thru here.
3101 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3102 if (!use_individual) {
3103 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3104 } else {
3105 elapsedTimer reserveTimer;
3106 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3107 // in numa interleaving, we have to allocate pages individually
3108 // (well really chunks of NUMAInterleaveGranularity size)
3109 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3110 if (res == NULL) {
3111 warning("NUMA page allocation failed");
3112 }
3113 if (Verbose && PrintMiscellaneous) {
3114 reserveTimer.stop();
3115 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3116 reserveTimer.milliseconds(), reserveTimer.ticks());
3117 }
3118 }
3119 assert(res == NULL || addr == NULL || addr == res,
3120 "Unexpected address from reserve.");
3121
3122 return res;
3123 }
3124
3125 // Reserve memory at an arbitrary address, only if that area is
3126 // available (and not reserved for something else).
3127 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3128 // Windows os::reserve_memory() fails of the requested address range is
3129 // not avilable.
3130 return reserve_memory(bytes, requested_addr);
3131 }
3132
3133 size_t os::large_page_size() {
3134 return _large_page_size;
3135 }
3136
3137 bool os::can_commit_large_page_memory() {
3138 // Windows only uses large page memory when the entire region is reserved
3139 // and committed in a single VirtualAlloc() call. This may change in the
3140 // future, but with Windows 2003 it's not possible to commit on demand.
3141 return false;
3142 }
3143
3144 bool os::can_execute_large_page_memory() {
3145 return true;
3146 }
3147
3148 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3149 bool exec) {
3150 assert(UseLargePages, "only for large pages");
3151
3152 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3153 return NULL; // Fallback to small pages.
3154 }
3155
3156 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3157 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3158
3159 // with large pages, there are two cases where we need to use Individual Allocation
3160 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3161 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3162 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3163 if (TracePageSizes && Verbose) {
3164 tty->print_cr("Reserving large pages individually.");
3165 }
3166 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3167 if (p_buf == NULL) {
3168 // give an appropriate warning message
3169 if (UseNUMAInterleaving) {
3170 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3171 }
3172 if (UseLargePagesIndividualAllocation) {
3173 warning("Individually allocated large pages failed, "
3174 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3175 }
3176 return NULL;
3177 }
3178
3179 return p_buf;
3180
3181 } else {
3182 if (TracePageSizes && Verbose) {
3183 tty->print_cr("Reserving large pages in a single large chunk.");
3184 }
3185 // normal policy just allocate it all at once
3186 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3187 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3188 if (res != NULL) {
3189 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3190 }
3191
3192 return res;
3193 }
3194 }
3195
3196 bool os::release_memory_special(char* base, size_t bytes) {
3197 assert(base != NULL, "Sanity check");
3198 return release_memory(base, bytes);
3199 }
3200
3201 void os::print_statistics() {
3202 }
3203
3204 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3205 int err = os::get_last_error();
3206 char buf[256];
3207 size_t buf_len = os::lasterror(buf, sizeof(buf));
3208 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3209 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3210 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3211 }
3212
3213 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3214 if (bytes == 0) {
3215 // Don't bother the OS with noops.
3216 return true;
3217 }
3218 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3219 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3220 // Don't attempt to print anything if the OS call fails. We're
3221 // probably low on resources, so the print itself may cause crashes.
3222
3223 // unless we have NUMAInterleaving enabled, the range of a commit
3224 // is always within a reserve covered by a single VirtualAlloc
3225 // in that case we can just do a single commit for the requested size
3226 if (!UseNUMAInterleaving) {
3227 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3228 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3229 return false;
3230 }
3231 if (exec) {
3232 DWORD oldprot;
3233 // Windows doc says to use VirtualProtect to get execute permissions
3234 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3235 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3236 return false;
3237 }
3238 }
3239 return true;
3240 } else {
3241
3242 // when NUMAInterleaving is enabled, the commit might cover a range that
3243 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3244 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3245 // returns represents the number of bytes that can be committed in one step.
3246 size_t bytes_remaining = bytes;
3247 char * next_alloc_addr = addr;
3248 while (bytes_remaining > 0) {
3249 MEMORY_BASIC_INFORMATION alloc_info;
3250 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3251 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3252 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3253 PAGE_READWRITE) == NULL) {
3254 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3255 exec);)
3256 return false;
3257 }
3258 if (exec) {
3259 DWORD oldprot;
3260 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3261 PAGE_EXECUTE_READWRITE, &oldprot)) {
3262 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3263 exec);)
3264 return false;
3265 }
3266 }
3267 bytes_remaining -= bytes_to_rq;
3268 next_alloc_addr += bytes_to_rq;
3269 }
3270 }
3271 // if we made it this far, return true
3272 return true;
3273 }
3274
3275 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3276 bool exec) {
3277 // alignment_hint is ignored on this OS
3278 return pd_commit_memory(addr, size, exec);
3279 }
3280
3281 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3282 const char* mesg) {
3283 assert(mesg != NULL, "mesg must be specified");
3284 if (!pd_commit_memory(addr, size, exec)) {
3285 warn_fail_commit_memory(addr, size, exec);
3286 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3287 }
3288 }
3289
3290 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3291 size_t alignment_hint, bool exec,
3292 const char* mesg) {
3293 // alignment_hint is ignored on this OS
3294 pd_commit_memory_or_exit(addr, size, exec, mesg);
3295 }
3296
3297 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3298 if (bytes == 0) {
3299 // Don't bother the OS with noops.
3300 return true;
3301 }
3302 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3303 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3304 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3305 }
3306
3307 bool os::pd_release_memory(char* addr, size_t bytes) {
3308 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3309 }
3310
3311 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3312 return os::commit_memory(addr, size, !ExecMem);
3313 }
3314
3315 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3316 return os::uncommit_memory(addr, size);
3317 }
3318
3319 // Set protections specified
3320 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3321 bool is_committed) {
3322 unsigned int p = 0;
3323 switch (prot) {
3324 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3325 case MEM_PROT_READ: p = PAGE_READONLY; break;
3326 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3327 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3328 default:
3329 ShouldNotReachHere();
3330 }
3331
3332 DWORD old_status;
3333
3334 // Strange enough, but on Win32 one can change protection only for committed
3335 // memory, not a big deal anyway, as bytes less or equal than 64K
3336 if (!is_committed) {
3337 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3338 "cannot commit protection page");
3339 }
3340 // One cannot use os::guard_memory() here, as on Win32 guard page
3341 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3342 //
3343 // Pages in the region become guard pages. Any attempt to access a guard page
3344 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3345 // the guard page status. Guard pages thus act as a one-time access alarm.
3346 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3347 }
3348
3349 bool os::guard_memory(char* addr, size_t bytes) {
3350 DWORD old_status;
3351 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3352 }
3353
3354 bool os::unguard_memory(char* addr, size_t bytes) {
3355 DWORD old_status;
3356 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3357 }
3358
3359 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3360 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3361 void os::numa_make_global(char *addr, size_t bytes) { }
3362 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3363 bool os::numa_topology_changed() { return false; }
3364 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3365 int os::numa_get_group_id() { return 0; }
3366 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3367 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3368 // Provide an answer for UMA systems
3369 ids[0] = 0;
3370 return 1;
3371 } else {
3372 // check for size bigger than actual groups_num
3373 size = MIN2(size, numa_get_groups_num());
3374 for (int i = 0; i < (int)size; i++) {
3375 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3376 }
3377 return size;
3378 }
3379 }
3380
3381 bool os::get_page_info(char *start, page_info* info) {
3382 return false;
3383 }
3384
3385 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3386 page_info* page_found) {
3387 return end;
3388 }
3389
3390 char* os::non_memory_address_word() {
3391 // Must never look like an address returned by reserve_memory,
3392 // even in its subfields (as defined by the CPU immediate fields,
3393 // if the CPU splits constants across multiple instructions).
3394 return (char*)-1;
3395 }
3396
3397 #define MAX_ERROR_COUNT 100
3398 #define SYS_THREAD_ERROR 0xffffffffUL
3399
3400 void os::pd_start_thread(Thread* thread) {
3401 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3402 // Returns previous suspend state:
3403 // 0: Thread was not suspended
3404 // 1: Thread is running now
3405 // >1: Thread is still suspended.
3406 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3407 }
3408
3409 class HighResolutionInterval : public CHeapObj<mtThread> {
3410 // The default timer resolution seems to be 10 milliseconds.
3411 // (Where is this written down?)
3412 // If someone wants to sleep for only a fraction of the default,
3413 // then we set the timer resolution down to 1 millisecond for
3414 // the duration of their interval.
3415 // We carefully set the resolution back, since otherwise we
3416 // seem to incur an overhead (3%?) that we don't need.
3417 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3418 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3419 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3420 // timeBeginPeriod() if the relative error exceeded some threshold.
3421 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3422 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3423 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3424 // resolution timers running.
3425 private:
3426 jlong resolution;
3427 public:
3428 HighResolutionInterval(jlong ms) {
3429 resolution = ms % 10L;
3430 if (resolution != 0) {
3431 MMRESULT result = timeBeginPeriod(1L);
3432 }
3433 }
3434 ~HighResolutionInterval() {
3435 if (resolution != 0) {
3436 MMRESULT result = timeEndPeriod(1L);
3437 }
3438 resolution = 0L;
3439 }
3440 };
3441
3442 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3443 jlong limit = (jlong) MAXDWORD;
3444
3445 while (ms > limit) {
3446 int res;
3447 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3448 return res;
3449 }
3450 ms -= limit;
3451 }
3452
3453 assert(thread == Thread::current(), "thread consistency check");
3454 OSThread* osthread = thread->osthread();
3455 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3456 int result;
3457 if (interruptable) {
3458 assert(thread->is_Java_thread(), "must be java thread");
3459 JavaThread *jt = (JavaThread *) thread;
3460 ThreadBlockInVM tbivm(jt);
3461
3462 jt->set_suspend_equivalent();
3463 // cleared by handle_special_suspend_equivalent_condition() or
3464 // java_suspend_self() via check_and_wait_while_suspended()
3465
3466 HANDLE events[1];
3467 events[0] = osthread->interrupt_event();
3468 HighResolutionInterval *phri=NULL;
3469 if (!ForceTimeHighResolution) {
3470 phri = new HighResolutionInterval(ms);
3471 }
3472 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3473 result = OS_TIMEOUT;
3474 } else {
3475 ResetEvent(osthread->interrupt_event());
3476 osthread->set_interrupted(false);
3477 result = OS_INTRPT;
3478 }
3479 delete phri; //if it is NULL, harmless
3480
3481 // were we externally suspended while we were waiting?
3482 jt->check_and_wait_while_suspended();
3483 } else {
3484 assert(!thread->is_Java_thread(), "must not be java thread");
3485 Sleep((long) ms);
3486 result = OS_TIMEOUT;
3487 }
3488 return result;
3489 }
3490
3491 // Short sleep, direct OS call.
3492 //
3493 // ms = 0, means allow others (if any) to run.
3494 //
3495 void os::naked_short_sleep(jlong ms) {
3496 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3497 Sleep(ms);
3498 }
3499
3500 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3501 void os::infinite_sleep() {
3502 while (true) { // sleep forever ...
3503 Sleep(100000); // ... 100 seconds at a time
3504 }
3505 }
3506
3507 typedef BOOL (WINAPI * STTSignature)(void);
3508
3509 void os::naked_yield() {
3510 // Use either SwitchToThread() or Sleep(0)
3511 // Consider passing back the return value from SwitchToThread().
3512 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3513 SwitchToThread();
3514 } else {
3515 Sleep(0);
3516 }
3517 }
3518
3519 // Win32 only gives you access to seven real priorities at a time,
3520 // so we compress Java's ten down to seven. It would be better
3521 // if we dynamically adjusted relative priorities.
3522
3523 int os::java_to_os_priority[CriticalPriority + 1] = {
3524 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3525 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3526 THREAD_PRIORITY_LOWEST, // 2
3527 THREAD_PRIORITY_BELOW_NORMAL, // 3
3528 THREAD_PRIORITY_BELOW_NORMAL, // 4
3529 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3530 THREAD_PRIORITY_NORMAL, // 6
3531 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3532 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3533 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3534 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3535 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3536 };
3537
3538 int prio_policy1[CriticalPriority + 1] = {
3539 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3540 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3541 THREAD_PRIORITY_LOWEST, // 2
3542 THREAD_PRIORITY_BELOW_NORMAL, // 3
3543 THREAD_PRIORITY_BELOW_NORMAL, // 4
3544 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3545 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3546 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3547 THREAD_PRIORITY_HIGHEST, // 8
3548 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3549 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3550 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3551 };
3552
3553 static int prio_init() {
3554 // If ThreadPriorityPolicy is 1, switch tables
3555 if (ThreadPriorityPolicy == 1) {
3556 int i;
3557 for (i = 0; i < CriticalPriority + 1; i++) {
3558 os::java_to_os_priority[i] = prio_policy1[i];
3559 }
3560 }
3561 if (UseCriticalJavaThreadPriority) {
3562 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3563 }
3564 return 0;
3565 }
3566
3567 OSReturn os::set_native_priority(Thread* thread, int priority) {
3568 if (!UseThreadPriorities) return OS_OK;
3569 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3570 return ret ? OS_OK : OS_ERR;
3571 }
3572
3573 OSReturn os::get_native_priority(const Thread* const thread,
3574 int* priority_ptr) {
3575 if (!UseThreadPriorities) {
3576 *priority_ptr = java_to_os_priority[NormPriority];
3577 return OS_OK;
3578 }
3579 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3580 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3581 assert(false, "GetThreadPriority failed");
3582 return OS_ERR;
3583 }
3584 *priority_ptr = os_prio;
3585 return OS_OK;
3586 }
3587
3588
3589 // Hint to the underlying OS that a task switch would not be good.
3590 // Void return because it's a hint and can fail.
3591 void os::hint_no_preempt() {}
3592
3593 void os::interrupt(Thread* thread) {
3594 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3595 Threads_lock->owned_by_self(),
3596 "possibility of dangling Thread pointer");
3597
3598 OSThread* osthread = thread->osthread();
3599 osthread->set_interrupted(true);
3600 // More than one thread can get here with the same value of osthread,
3601 // resulting in multiple notifications. We do, however, want the store
3602 // to interrupted() to be visible to other threads before we post
3603 // the interrupt event.
3604 OrderAccess::release();
3605 SetEvent(osthread->interrupt_event());
3606 // For JSR166: unpark after setting status
3607 if (thread->is_Java_thread()) {
3608 ((JavaThread*)thread)->parker()->unpark();
3609 }
3610
3611 ParkEvent * ev = thread->_ParkEvent;
3612 if (ev != NULL) ev->unpark();
3613 }
3614
3615
3616 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3617 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3618 "possibility of dangling Thread pointer");
3619
3620 OSThread* osthread = thread->osthread();
3621 // There is no synchronization between the setting of the interrupt
3622 // and it being cleared here. It is critical - see 6535709 - that
3623 // we only clear the interrupt state, and reset the interrupt event,
3624 // if we are going to report that we were indeed interrupted - else
3625 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3626 // depending on the timing. By checking thread interrupt event to see
3627 // if the thread gets real interrupt thus prevent spurious wakeup.
3628 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3629 if (interrupted && clear_interrupted) {
3630 osthread->set_interrupted(false);
3631 ResetEvent(osthread->interrupt_event());
3632 } // Otherwise leave the interrupted state alone
3633
3634 return interrupted;
3635 }
3636
3637 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3638 ExtendedPC os::get_thread_pc(Thread* thread) {
3639 CONTEXT context;
3640 context.ContextFlags = CONTEXT_CONTROL;
3641 HANDLE handle = thread->osthread()->thread_handle();
3642 #ifdef _M_IA64
3643 assert(0, "Fix get_thread_pc");
3644 return ExtendedPC(NULL);
3645 #else
3646 if (GetThreadContext(handle, &context)) {
3647 #ifdef _M_AMD64
3648 return ExtendedPC((address) context.Rip);
3649 #else
3650 return ExtendedPC((address) context.Eip);
3651 #endif
3652 } else {
3653 return ExtendedPC(NULL);
3654 }
3655 #endif
3656 }
3657
3658 // GetCurrentThreadId() returns DWORD
3659 intx os::current_thread_id() { return GetCurrentThreadId(); }
3660
3661 static int _initial_pid = 0;
3662
3663 int os::current_process_id() {
3664 return (_initial_pid ? _initial_pid : _getpid());
3665 }
3666
3667 int os::win32::_vm_page_size = 0;
3668 int os::win32::_vm_allocation_granularity = 0;
3669 int os::win32::_processor_type = 0;
3670 // Processor level is not available on non-NT systems, use vm_version instead
3671 int os::win32::_processor_level = 0;
3672 julong os::win32::_physical_memory = 0;
3673 size_t os::win32::_default_stack_size = 0;
3674
3675 intx os::win32::_os_thread_limit = 0;
3676 volatile intx os::win32::_os_thread_count = 0;
3677
3678 bool os::win32::_is_nt = false;
3679 bool os::win32::_is_windows_2003 = false;
3680 bool os::win32::_is_windows_server = false;
3681
3682 // 6573254
3683 // Currently, the bug is observed across all the supported Windows releases,
3684 // including the latest one (as of this writing - Windows Server 2012 R2)
3685 bool os::win32::_has_exit_bug = true;
3686 bool os::win32::_has_performance_count = 0;
3687
3688 void os::win32::initialize_system_info() {
3689 SYSTEM_INFO si;
3690 GetSystemInfo(&si);
3691 _vm_page_size = si.dwPageSize;
3692 _vm_allocation_granularity = si.dwAllocationGranularity;
3693 _processor_type = si.dwProcessorType;
3694 _processor_level = si.wProcessorLevel;
3695 set_processor_count(si.dwNumberOfProcessors);
3696
3697 MEMORYSTATUSEX ms;
3698 ms.dwLength = sizeof(ms);
3699
3700 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3701 // dwMemoryLoad (% of memory in use)
3702 GlobalMemoryStatusEx(&ms);
3703 _physical_memory = ms.ullTotalPhys;
3704
3705 OSVERSIONINFOEX oi;
3706 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3707 GetVersionEx((OSVERSIONINFO*)&oi);
3708 switch (oi.dwPlatformId) {
3709 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3710 case VER_PLATFORM_WIN32_NT:
3711 _is_nt = true;
3712 {
3713 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3714 if (os_vers == 5002) {
3715 _is_windows_2003 = true;
3716 }
3717 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3718 oi.wProductType == VER_NT_SERVER) {
3719 _is_windows_server = true;
3720 }
3721 }
3722 break;
3723 default: fatal("Unknown platform");
3724 }
3725
3726 _default_stack_size = os::current_stack_size();
3727 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3728 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3729 "stack size not a multiple of page size");
3730
3731 initialize_performance_counter();
3732
3733 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3734 // known to deadlock the system, if the VM issues to thread operations with
3735 // a too high frequency, e.g., such as changing the priorities.
3736 // The 6000 seems to work well - no deadlocks has been notices on the test
3737 // programs that we have seen experience this problem.
3738 if (!os::win32::is_nt()) {
3739 StarvationMonitorInterval = 6000;
3740 }
3741 }
3742
3743
3744 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3745 int ebuflen) {
3746 char path[MAX_PATH];
3747 DWORD size;
3748 DWORD pathLen = (DWORD)sizeof(path);
3749 HINSTANCE result = NULL;
3750
3751 // only allow library name without path component
3752 assert(strchr(name, '\\') == NULL, "path not allowed");
3753 assert(strchr(name, ':') == NULL, "path not allowed");
3754 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3755 jio_snprintf(ebuf, ebuflen,
3756 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3757 return NULL;
3758 }
3759
3760 // search system directory
3761 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3762 if (size >= pathLen) {
3763 return NULL; // truncated
3764 }
3765 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3766 return NULL; // truncated
3767 }
3768 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3769 return result;
3770 }
3771 }
3772
3773 // try Windows directory
3774 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3775 if (size >= pathLen) {
3776 return NULL; // truncated
3777 }
3778 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3779 return NULL; // truncated
3780 }
3781 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3782 return result;
3783 }
3784 }
3785
3786 jio_snprintf(ebuf, ebuflen,
3787 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3788 return NULL;
3789 }
3790
3791 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */
3792
3793 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3794 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3795 return TRUE;
3796 }
3797
3798 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3799 // Basic approach:
3800 // - Each exiting thread registers its intent to exit and then does so.
3801 // - A thread trying to terminate the process must wait for all
3802 // threads currently exiting to complete their exit.
3803
3804 if (os::win32::has_exit_bug()) {
3805 // The array holds handles of the threads that have started exiting by calling
3806 // _endthreadex().
3807 // Should be large enough to avoid blocking the exiting thread due to lack of
3808 // a free slot.
3809 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3810 static int handle_count = 0;
3811
3812 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3813 static CRITICAL_SECTION crit_sect;
3814 static volatile jint process_exiting = 0;
3815 int i, j;
3816 DWORD res;
3817 HANDLE hproc, hthr;
3818
3819 // The first thread that reached this point, initializes the critical section.
3820 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3821 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3822 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3823 EnterCriticalSection(&crit_sect);
3824
3825 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3826 // Remove from the array those handles of the threads that have completed exiting.
3827 for (i = 0, j = 0; i < handle_count; ++i) {
3828 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3829 if (res == WAIT_TIMEOUT) {
3830 handles[j++] = handles[i];
3831 } else {
3832 if (res == WAIT_FAILED) {
3833 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3834 GetLastError(), __FILE__, __LINE__);
3835 }
3836 // Don't keep the handle, if we failed waiting for it.
3837 CloseHandle(handles[i]);
3838 }
3839 }
3840
3841 // If there's no free slot in the array of the kept handles, we'll have to
3842 // wait until at least one thread completes exiting.
3843 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3844 // Raise the priority of the oldest exiting thread to increase its chances
3845 // to complete sooner.
3846 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3847 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3848 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3849 i = (res - WAIT_OBJECT_0);
3850 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3851 for (; i < handle_count; ++i) {
3852 handles[i] = handles[i + 1];
3853 }
3854 } else {
3855 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3856 (res == WAIT_FAILED ? "failed" : "timed out"),
3857 GetLastError(), __FILE__, __LINE__);
3858 // Don't keep handles, if we failed waiting for them.
3859 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3860 CloseHandle(handles[i]);
3861 }
3862 handle_count = 0;
3863 }
3864 }
3865
3866 // Store a duplicate of the current thread handle in the array of handles.
3867 hproc = GetCurrentProcess();
3868 hthr = GetCurrentThread();
3869 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3870 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3871 warning("DuplicateHandle failed (%u) in %s: %d\n",
3872 GetLastError(), __FILE__, __LINE__);
3873 } else {
3874 ++handle_count;
3875 }
3876
3877 // The current exiting thread has stored its handle in the array, and now
3878 // should leave the critical section before calling _endthreadex().
3879
3880 } else if (what != EPT_THREAD) {
3881 if (handle_count > 0) {
3882 // Before ending the process, make sure all the threads that had called
3883 // _endthreadex() completed.
3884
3885 // Set the priority level of the current thread to the same value as
3886 // the priority level of exiting threads.
3887 // This is to ensure it will be given a fair chance to execute if
3888 // the timeout expires.
3889 hthr = GetCurrentThread();
3890 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3891 for (i = 0; i < handle_count; ++i) {
3892 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3893 }
3894 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3895 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3896 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3897 (res == WAIT_FAILED ? "failed" : "timed out"),
3898 GetLastError(), __FILE__, __LINE__);
3899 }
3900 for (i = 0; i < handle_count; ++i) {
3901 CloseHandle(handles[i]);
3902 }
3903 handle_count = 0;
3904 }
3905
3906 OrderAccess::release_store(&process_exiting, 1);
3907 }
3908
3909 LeaveCriticalSection(&crit_sect);
3910 }
3911
3912 if (what == EPT_THREAD) {
3913 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3914 // Some other thread is about to call exit(), so we
3915 // don't let the current thread proceed to _endthreadex()
3916 SuspendThread(GetCurrentThread());
3917 // Avoid busy-wait loop, if SuspendThread() failed.
3918 Sleep(EXIT_TIMEOUT);
3919 }
3920 }
3921 }
3922
3923 // We are here if either
3924 // - there's no 'race at exit' bug on this OS release;
3925 // - initialization of the critical section failed (unlikely);
3926 // - the current thread has stored its handle and left the critical section;
3927 // - the process-exiting thread has raised the flag and left the critical section.
3928 if (what == EPT_THREAD) {
3929 _endthreadex((unsigned)exit_code);
3930 } else if (what == EPT_PROCESS) {
3931 ::exit(exit_code);
3932 } else {
3933 _exit(exit_code);
3934 }
3935
3936 // Should not reach here
3937 return exit_code;
3938 }
3939
3940 #undef EXIT_TIMEOUT
3941
3942 void os::win32::setmode_streams() {
3943 _setmode(_fileno(stdin), _O_BINARY);
3944 _setmode(_fileno(stdout), _O_BINARY);
3945 _setmode(_fileno(stderr), _O_BINARY);
3946 }
3947
3948
3949 bool os::is_debugger_attached() {
3950 return IsDebuggerPresent() ? true : false;
3951 }
3952
3953
3954 void os::wait_for_keypress_at_exit(void) {
3955 if (PauseAtExit) {
3956 fprintf(stderr, "Press any key to continue...\n");
3957 fgetc(stdin);
3958 }
3959 }
3960
3961
3962 int os::message_box(const char* title, const char* message) {
3963 int result = MessageBox(NULL, message, title,
3964 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3965 return result == IDYES;
3966 }
3967
3968 int os::allocate_thread_local_storage() {
3969 return TlsAlloc();
3970 }
3971
3972
3973 void os::free_thread_local_storage(int index) {
3974 TlsFree(index);
3975 }
3976
3977
3978 void os::thread_local_storage_at_put(int index, void* value) {
3979 TlsSetValue(index, value);
3980 assert(thread_local_storage_at(index) == value, "Just checking");
3981 }
3982
3983
3984 void* os::thread_local_storage_at(int index) {
3985 return TlsGetValue(index);
3986 }
3987
3988
3989 #ifndef PRODUCT
3990 #ifndef _WIN64
3991 // Helpers to check whether NX protection is enabled
3992 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3993 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3994 pex->ExceptionRecord->NumberParameters > 0 &&
3995 pex->ExceptionRecord->ExceptionInformation[0] ==
3996 EXCEPTION_INFO_EXEC_VIOLATION) {
3997 return EXCEPTION_EXECUTE_HANDLER;
3998 }
3999 return EXCEPTION_CONTINUE_SEARCH;
4000 }
4001
4002 void nx_check_protection() {
4003 // If NX is enabled we'll get an exception calling into code on the stack
4004 char code[] = { (char)0xC3 }; // ret
4005 void *code_ptr = (void *)code;
4006 __try {
4007 __asm call code_ptr
4008 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4009 tty->print_raw_cr("NX protection detected.");
4010 }
4011 }
4012 #endif // _WIN64
4013 #endif // PRODUCT
4014
4015 // this is called _before_ the global arguments have been parsed
4016 void os::init(void) {
4017 _initial_pid = _getpid();
4018
4019 init_random(1234567);
4020
4021 win32::initialize_system_info();
4022 win32::setmode_streams();
4023 init_page_sizes((size_t) win32::vm_page_size());
4024
4025 // This may be overridden later when argument processing is done.
4026 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4027 os::win32::is_windows_2003());
4028
4029 // Initialize main_process and main_thread
4030 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4031 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4032 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4033 fatal("DuplicateHandle failed\n");
4034 }
4035 main_thread_id = (int) GetCurrentThreadId();
4036 }
4037
4038 // To install functions for atexit processing
4039 extern "C" {
4040 static void perfMemory_exit_helper() {
4041 perfMemory_exit();
4042 }
4043 }
4044
4045 static jint initSock();
4046
4047 // this is called _after_ the global arguments have been parsed
4048 jint os::init_2(void) {
4049 // Allocate a single page and mark it as readable for safepoint polling
4050 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4051 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4052
4053 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4054 guarantee(return_page != NULL, "Commit Failed for polling page");
4055
4056 os::set_polling_page(polling_page);
4057
4058 #ifndef PRODUCT
4059 if (Verbose && PrintMiscellaneous) {
4060 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4061 (intptr_t)polling_page);
4062 }
4063 #endif
4064
4065 if (!UseMembar) {
4066 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4067 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4068
4069 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4070 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4071
4072 os::set_memory_serialize_page(mem_serialize_page);
4073
4074 #ifndef PRODUCT
4075 if (Verbose && PrintMiscellaneous) {
4076 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4077 (intptr_t)mem_serialize_page);
4078 }
4079 #endif
4080 }
4081
4082 // Setup Windows Exceptions
4083
4084 // for debugging float code generation bugs
4085 if (ForceFloatExceptions) {
4086 #ifndef _WIN64
4087 static long fp_control_word = 0;
4088 __asm { fstcw fp_control_word }
4089 // see Intel PPro Manual, Vol. 2, p 7-16
4090 const long precision = 0x20;
4091 const long underflow = 0x10;
4092 const long overflow = 0x08;
4093 const long zero_div = 0x04;
4094 const long denorm = 0x02;
4095 const long invalid = 0x01;
4096 fp_control_word |= invalid;
4097 __asm { fldcw fp_control_word }
4098 #endif
4099 }
4100
4101 // If stack_commit_size is 0, windows will reserve the default size,
4102 // but only commit a small portion of it.
4103 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4104 size_t default_reserve_size = os::win32::default_stack_size();
4105 size_t actual_reserve_size = stack_commit_size;
4106 if (stack_commit_size < default_reserve_size) {
4107 // If stack_commit_size == 0, we want this too
4108 actual_reserve_size = default_reserve_size;
4109 }
4110
4111 // Check minimum allowable stack size for thread creation and to initialize
4112 // the java system classes, including StackOverflowError - depends on page
4113 // size. Add a page for compiler2 recursion in main thread.
4114 // Add in 2*BytesPerWord times page size to account for VM stack during
4115 // class initialization depending on 32 or 64 bit VM.
4116 size_t min_stack_allowed =
4117 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4118 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4119 if (actual_reserve_size < min_stack_allowed) {
4120 tty->print_cr("\nThe stack size specified is too small, "
4121 "Specify at least %dk",
4122 min_stack_allowed / K);
4123 return JNI_ERR;
4124 }
4125
4126 JavaThread::set_stack_size_at_create(stack_commit_size);
4127
4128 // Calculate theoretical max. size of Threads to guard gainst artifical
4129 // out-of-memory situations, where all available address-space has been
4130 // reserved by thread stacks.
4131 assert(actual_reserve_size != 0, "Must have a stack");
4132
4133 // Calculate the thread limit when we should start doing Virtual Memory
4134 // banging. Currently when the threads will have used all but 200Mb of space.
4135 //
4136 // TODO: consider performing a similar calculation for commit size instead
4137 // as reserve size, since on a 64-bit platform we'll run into that more
4138 // often than running out of virtual memory space. We can use the
4139 // lower value of the two calculations as the os_thread_limit.
4140 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4141 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4142
4143 // at exit methods are called in the reverse order of their registration.
4144 // there is no limit to the number of functions registered. atexit does
4145 // not set errno.
4146
4147 if (PerfAllowAtExitRegistration) {
4148 // only register atexit functions if PerfAllowAtExitRegistration is set.
4149 // atexit functions can be delayed until process exit time, which
4150 // can be problematic for embedded VM situations. Embedded VMs should
4151 // call DestroyJavaVM() to assure that VM resources are released.
4152
4153 // note: perfMemory_exit_helper atexit function may be removed in
4154 // the future if the appropriate cleanup code can be added to the
4155 // VM_Exit VMOperation's doit method.
4156 if (atexit(perfMemory_exit_helper) != 0) {
4157 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4158 }
4159 }
4160
4161 #ifndef _WIN64
4162 // Print something if NX is enabled (win32 on AMD64)
4163 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4164 #endif
4165
4166 // initialize thread priority policy
4167 prio_init();
4168
4169 if (UseNUMA && !ForceNUMA) {
4170 UseNUMA = false; // We don't fully support this yet
4171 }
4172
4173 if (UseNUMAInterleaving) {
4174 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4175 bool success = numa_interleaving_init();
4176 if (!success) UseNUMAInterleaving = false;
4177 }
4178
4179 if (initSock() != JNI_OK) {
4180 return JNI_ERR;
4181 }
4182
4183 return JNI_OK;
4184 }
4185
4186 // Mark the polling page as unreadable
4187 void os::make_polling_page_unreadable(void) {
4188 DWORD old_status;
4189 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4190 PAGE_NOACCESS, &old_status)) {
4191 fatal("Could not disable polling page");
4192 }
4193 }
4194
4195 // Mark the polling page as readable
4196 void os::make_polling_page_readable(void) {
4197 DWORD old_status;
4198 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4199 PAGE_READONLY, &old_status)) {
4200 fatal("Could not enable polling page");
4201 }
4202 }
4203
4204
4205 int os::stat(const char *path, struct stat *sbuf) {
4206 char pathbuf[MAX_PATH];
4207 if (strlen(path) > MAX_PATH - 1) {
4208 errno = ENAMETOOLONG;
4209 return -1;
4210 }
4211 os::native_path(strcpy(pathbuf, path));
4212 int ret = ::stat(pathbuf, sbuf);
4213 if (sbuf != NULL && UseUTCFileTimestamp) {
4214 // Fix for 6539723. st_mtime returned from stat() is dependent on
4215 // the system timezone and so can return different values for the
4216 // same file if/when daylight savings time changes. This adjustment
4217 // makes sure the same timestamp is returned regardless of the TZ.
4218 //
4219 // See:
4220 // http://msdn.microsoft.com/library/
4221 // default.asp?url=/library/en-us/sysinfo/base/
4222 // time_zone_information_str.asp
4223 // and
4224 // http://msdn.microsoft.com/library/default.asp?url=
4225 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4226 //
4227 // NOTE: there is a insidious bug here: If the timezone is changed
4228 // after the call to stat() but before 'GetTimeZoneInformation()', then
4229 // the adjustment we do here will be wrong and we'll return the wrong
4230 // value (which will likely end up creating an invalid class data
4231 // archive). Absent a better API for this, or some time zone locking
4232 // mechanism, we'll have to live with this risk.
4233 TIME_ZONE_INFORMATION tz;
4234 DWORD tzid = GetTimeZoneInformation(&tz);
4235 int daylightBias =
4236 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4237 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4238 }
4239 return ret;
4240 }
4241
4242
4243 #define FT2INT64(ft) \
4244 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4245
4246
4247 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4248 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4249 // of a thread.
4250 //
4251 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4252 // the fast estimate available on the platform.
4253
4254 // current_thread_cpu_time() is not optimized for Windows yet
4255 jlong os::current_thread_cpu_time() {
4256 // return user + sys since the cost is the same
4257 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4258 }
4259
4260 jlong os::thread_cpu_time(Thread* thread) {
4261 // consistent with what current_thread_cpu_time() returns.
4262 return os::thread_cpu_time(thread, true /* user+sys */);
4263 }
4264
4265 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4266 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4267 }
4268
4269 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4270 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4271 // If this function changes, os::is_thread_cpu_time_supported() should too
4272 if (os::win32::is_nt()) {
4273 FILETIME CreationTime;
4274 FILETIME ExitTime;
4275 FILETIME KernelTime;
4276 FILETIME UserTime;
4277
4278 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4279 &ExitTime, &KernelTime, &UserTime) == 0) {
4280 return -1;
4281 } else if (user_sys_cpu_time) {
4282 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4283 } else {
4284 return FT2INT64(UserTime) * 100;
4285 }
4286 } else {
4287 return (jlong) timeGetTime() * 1000000;
4288 }
4289 }
4290
4291 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4292 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4293 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4294 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4295 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4296 }
4297
4298 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4299 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4300 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4301 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4302 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4303 }
4304
4305 bool os::is_thread_cpu_time_supported() {
4306 // see os::thread_cpu_time
4307 if (os::win32::is_nt()) {
4308 FILETIME CreationTime;
4309 FILETIME ExitTime;
4310 FILETIME KernelTime;
4311 FILETIME UserTime;
4312
4313 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4314 &KernelTime, &UserTime) == 0) {
4315 return false;
4316 } else {
4317 return true;
4318 }
4319 } else {
4320 return false;
4321 }
4322 }
4323
4324 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4325 // It does have primitives (PDH API) to get CPU usage and run queue length.
4326 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4327 // If we wanted to implement loadavg on Windows, we have a few options:
4328 //
4329 // a) Query CPU usage and run queue length and "fake" an answer by
4330 // returning the CPU usage if it's under 100%, and the run queue
4331 // length otherwise. It turns out that querying is pretty slow
4332 // on Windows, on the order of 200 microseconds on a fast machine.
4333 // Note that on the Windows the CPU usage value is the % usage
4334 // since the last time the API was called (and the first call
4335 // returns 100%), so we'd have to deal with that as well.
4336 //
4337 // b) Sample the "fake" answer using a sampling thread and store
4338 // the answer in a global variable. The call to loadavg would
4339 // just return the value of the global, avoiding the slow query.
4340 //
4341 // c) Sample a better answer using exponential decay to smooth the
4342 // value. This is basically the algorithm used by UNIX kernels.
4343 //
4344 // Note that sampling thread starvation could affect both (b) and (c).
4345 int os::loadavg(double loadavg[], int nelem) {
4346 return -1;
4347 }
4348
4349
4350 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4351 bool os::dont_yield() {
4352 return DontYieldALot;
4353 }
4354
4355 // This method is a slightly reworked copy of JDK's sysOpen
4356 // from src/windows/hpi/src/sys_api_md.c
4357
4358 int os::open(const char *path, int oflag, int mode) {
4359 char pathbuf[MAX_PATH];
4360
4361 if (strlen(path) > MAX_PATH - 1) {
4362 errno = ENAMETOOLONG;
4363 return -1;
4364 }
4365 os::native_path(strcpy(pathbuf, path));
4366 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4367 }
4368
4369 FILE* os::open(int fd, const char* mode) {
4370 return ::_fdopen(fd, mode);
4371 }
4372
4373 // Is a (classpath) directory empty?
4374 bool os::dir_is_empty(const char* path) {
4375 WIN32_FIND_DATA fd;
4376 HANDLE f = FindFirstFile(path, &fd);
4377 if (f == INVALID_HANDLE_VALUE) {
4378 return true;
4379 }
4380 FindClose(f);
4381 return false;
4382 }
4383
4384 // create binary file, rewriting existing file if required
4385 int os::create_binary_file(const char* path, bool rewrite_existing) {
4386 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4387 if (!rewrite_existing) {
4388 oflags |= _O_EXCL;
4389 }
4390 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4391 }
4392
4393 // return current position of file pointer
4394 jlong os::current_file_offset(int fd) {
4395 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4396 }
4397
4398 // move file pointer to the specified offset
4399 jlong os::seek_to_file_offset(int fd, jlong offset) {
4400 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4401 }
4402
4403
4404 jlong os::lseek(int fd, jlong offset, int whence) {
4405 return (jlong) ::_lseeki64(fd, offset, whence);
4406 }
4407
4408 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4409 OVERLAPPED ov;
4410 DWORD nread;
4411 BOOL result;
4412
4413 ZeroMemory(&ov, sizeof(ov));
4414 ov.Offset = (DWORD)offset;
4415 ov.OffsetHigh = (DWORD)(offset >> 32);
4416
4417 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4418
4419 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4420
4421 return result ? nread : 0;
4422 }
4423
4424
4425 // This method is a slightly reworked copy of JDK's sysNativePath
4426 // from src/windows/hpi/src/path_md.c
4427
4428 // Convert a pathname to native format. On win32, this involves forcing all
4429 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4430 // sometimes rejects '/') and removing redundant separators. The input path is
4431 // assumed to have been converted into the character encoding used by the local
4432 // system. Because this might be a double-byte encoding, care is taken to
4433 // treat double-byte lead characters correctly.
4434 //
4435 // This procedure modifies the given path in place, as the result is never
4436 // longer than the original. There is no error return; this operation always
4437 // succeeds.
4438 char * os::native_path(char *path) {
4439 char *src = path, *dst = path, *end = path;
4440 char *colon = NULL; // If a drive specifier is found, this will
4441 // point to the colon following the drive letter
4442
4443 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4444 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4445 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4446
4447 // Check for leading separators
4448 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4449 while (isfilesep(*src)) {
4450 src++;
4451 }
4452
4453 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4454 // Remove leading separators if followed by drive specifier. This
4455 // hack is necessary to support file URLs containing drive
4456 // specifiers (e.g., "file://c:/path"). As a side effect,
4457 // "/c:/path" can be used as an alternative to "c:/path".
4458 *dst++ = *src++;
4459 colon = dst;
4460 *dst++ = ':';
4461 src++;
4462 } else {
4463 src = path;
4464 if (isfilesep(src[0]) && isfilesep(src[1])) {
4465 // UNC pathname: Retain first separator; leave src pointed at
4466 // second separator so that further separators will be collapsed
4467 // into the second separator. The result will be a pathname
4468 // beginning with "\\\\" followed (most likely) by a host name.
4469 src = dst = path + 1;
4470 path[0] = '\\'; // Force first separator to '\\'
4471 }
4472 }
4473
4474 end = dst;
4475
4476 // Remove redundant separators from remainder of path, forcing all
4477 // separators to be '\\' rather than '/'. Also, single byte space
4478 // characters are removed from the end of the path because those
4479 // are not legal ending characters on this operating system.
4480 //
4481 while (*src != '\0') {
4482 if (isfilesep(*src)) {
4483 *dst++ = '\\'; src++;
4484 while (isfilesep(*src)) src++;
4485 if (*src == '\0') {
4486 // Check for trailing separator
4487 end = dst;
4488 if (colon == dst - 2) break; // "z:\\"
4489 if (dst == path + 1) break; // "\\"
4490 if (dst == path + 2 && isfilesep(path[0])) {
4491 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4492 // beginning of a UNC pathname. Even though it is not, by
4493 // itself, a valid UNC pathname, we leave it as is in order
4494 // to be consistent with the path canonicalizer as well
4495 // as the win32 APIs, which treat this case as an invalid
4496 // UNC pathname rather than as an alias for the root
4497 // directory of the current drive.
4498 break;
4499 }
4500 end = --dst; // Path does not denote a root directory, so
4501 // remove trailing separator
4502 break;
4503 }
4504 end = dst;
4505 } else {
4506 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4507 *dst++ = *src++;
4508 if (*src) *dst++ = *src++;
4509 end = dst;
4510 } else { // Copy a single-byte character
4511 char c = *src++;
4512 *dst++ = c;
4513 // Space is not a legal ending character
4514 if (c != ' ') end = dst;
4515 }
4516 }
4517 }
4518
4519 *end = '\0';
4520
4521 // For "z:", add "." to work around a bug in the C runtime library
4522 if (colon == dst - 1) {
4523 path[2] = '.';
4524 path[3] = '\0';
4525 }
4526
4527 return path;
4528 }
4529
4530 // This code is a copy of JDK's sysSetLength
4531 // from src/windows/hpi/src/sys_api_md.c
4532
4533 int os::ftruncate(int fd, jlong length) {
4534 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4535 long high = (long)(length >> 32);
4536 DWORD ret;
4537
4538 if (h == (HANDLE)(-1)) {
4539 return -1;
4540 }
4541
4542 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4543 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4544 return -1;
4545 }
4546
4547 if (::SetEndOfFile(h) == FALSE) {
4548 return -1;
4549 }
4550
4551 return 0;
4552 }
4553
4554
4555 // This code is a copy of JDK's sysSync
4556 // from src/windows/hpi/src/sys_api_md.c
4557 // except for the legacy workaround for a bug in Win 98
4558
4559 int os::fsync(int fd) {
4560 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4561
4562 if ((!::FlushFileBuffers(handle)) &&
4563 (GetLastError() != ERROR_ACCESS_DENIED)) {
4564 // from winerror.h
4565 return -1;
4566 }
4567 return 0;
4568 }
4569
4570 static int nonSeekAvailable(int, long *);
4571 static int stdinAvailable(int, long *);
4572
4573 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4574 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4575
4576 // This code is a copy of JDK's sysAvailable
4577 // from src/windows/hpi/src/sys_api_md.c
4578
4579 int os::available(int fd, jlong *bytes) {
4580 jlong cur, end;
4581 struct _stati64 stbuf64;
4582
4583 if (::_fstati64(fd, &stbuf64) >= 0) {
4584 int mode = stbuf64.st_mode;
4585 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4586 int ret;
4587 long lpbytes;
4588 if (fd == 0) {
4589 ret = stdinAvailable(fd, &lpbytes);
4590 } else {
4591 ret = nonSeekAvailable(fd, &lpbytes);
4592 }
4593 (*bytes) = (jlong)(lpbytes);
4594 return ret;
4595 }
4596 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4597 return FALSE;
4598 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4599 return FALSE;
4600 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4601 return FALSE;
4602 }
4603 *bytes = end - cur;
4604 return TRUE;
4605 } else {
4606 return FALSE;
4607 }
4608 }
4609
4610 // This code is a copy of JDK's nonSeekAvailable
4611 // from src/windows/hpi/src/sys_api_md.c
4612
4613 static int nonSeekAvailable(int fd, long *pbytes) {
4614 // This is used for available on non-seekable devices
4615 // (like both named and anonymous pipes, such as pipes
4616 // connected to an exec'd process).
4617 // Standard Input is a special case.
4618 HANDLE han;
4619
4620 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4621 return FALSE;
4622 }
4623
4624 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4625 // PeekNamedPipe fails when at EOF. In that case we
4626 // simply make *pbytes = 0 which is consistent with the
4627 // behavior we get on Solaris when an fd is at EOF.
4628 // The only alternative is to raise an Exception,
4629 // which isn't really warranted.
4630 //
4631 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4632 return FALSE;
4633 }
4634 *pbytes = 0;
4635 }
4636 return TRUE;
4637 }
4638
4639 #define MAX_INPUT_EVENTS 2000
4640
4641 // This code is a copy of JDK's stdinAvailable
4642 // from src/windows/hpi/src/sys_api_md.c
4643
4644 static int stdinAvailable(int fd, long *pbytes) {
4645 HANDLE han;
4646 DWORD numEventsRead = 0; // Number of events read from buffer
4647 DWORD numEvents = 0; // Number of events in buffer
4648 DWORD i = 0; // Loop index
4649 DWORD curLength = 0; // Position marker
4650 DWORD actualLength = 0; // Number of bytes readable
4651 BOOL error = FALSE; // Error holder
4652 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4653
4654 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4655 return FALSE;
4656 }
4657
4658 // Construct an array of input records in the console buffer
4659 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4660 if (error == 0) {
4661 return nonSeekAvailable(fd, pbytes);
4662 }
4663
4664 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4665 if (numEvents > MAX_INPUT_EVENTS) {
4666 numEvents = MAX_INPUT_EVENTS;
4667 }
4668
4669 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4670 if (lpBuffer == NULL) {
4671 return FALSE;
4672 }
4673
4674 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4675 if (error == 0) {
4676 os::free(lpBuffer);
4677 return FALSE;
4678 }
4679
4680 // Examine input records for the number of bytes available
4681 for (i=0; i<numEvents; i++) {
4682 if (lpBuffer[i].EventType == KEY_EVENT) {
4683
4684 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4685 &(lpBuffer[i].Event);
4686 if (keyRecord->bKeyDown == TRUE) {
4687 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4688 curLength++;
4689 if (*keyPressed == '\r') {
4690 actualLength = curLength;
4691 }
4692 }
4693 }
4694 }
4695
4696 if (lpBuffer != NULL) {
4697 os::free(lpBuffer);
4698 }
4699
4700 *pbytes = (long) actualLength;
4701 return TRUE;
4702 }
4703
4704 // Map a block of memory.
4705 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4706 char *addr, size_t bytes, bool read_only,
4707 bool allow_exec) {
4708 HANDLE hFile;
4709 char* base;
4710
4711 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4712 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4713 if (hFile == NULL) {
4714 if (PrintMiscellaneous && Verbose) {
4715 DWORD err = GetLastError();
4716 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4717 }
4718 return NULL;
4719 }
4720
4721 if (allow_exec) {
4722 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4723 // unless it comes from a PE image (which the shared archive is not.)
4724 // Even VirtualProtect refuses to give execute access to mapped memory
4725 // that was not previously executable.
4726 //
4727 // Instead, stick the executable region in anonymous memory. Yuck.
4728 // Penalty is that ~4 pages will not be shareable - in the future
4729 // we might consider DLLizing the shared archive with a proper PE
4730 // header so that mapping executable + sharing is possible.
4731
4732 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4733 PAGE_READWRITE);
4734 if (base == NULL) {
4735 if (PrintMiscellaneous && Verbose) {
4736 DWORD err = GetLastError();
4737 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4738 }
4739 CloseHandle(hFile);
4740 return NULL;
4741 }
4742
4743 DWORD bytes_read;
4744 OVERLAPPED overlapped;
4745 overlapped.Offset = (DWORD)file_offset;
4746 overlapped.OffsetHigh = 0;
4747 overlapped.hEvent = NULL;
4748 // ReadFile guarantees that if the return value is true, the requested
4749 // number of bytes were read before returning.
4750 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4751 if (!res) {
4752 if (PrintMiscellaneous && Verbose) {
4753 DWORD err = GetLastError();
4754 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4755 }
4756 release_memory(base, bytes);
4757 CloseHandle(hFile);
4758 return NULL;
4759 }
4760 } else {
4761 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4762 NULL /* file_name */);
4763 if (hMap == NULL) {
4764 if (PrintMiscellaneous && Verbose) {
4765 DWORD err = GetLastError();
4766 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4767 }
4768 CloseHandle(hFile);
4769 return NULL;
4770 }
4771
4772 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4773 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4774 (DWORD)bytes, addr);
4775 if (base == NULL) {
4776 if (PrintMiscellaneous && Verbose) {
4777 DWORD err = GetLastError();
4778 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4779 }
4780 CloseHandle(hMap);
4781 CloseHandle(hFile);
4782 return NULL;
4783 }
4784
4785 if (CloseHandle(hMap) == 0) {
4786 if (PrintMiscellaneous && Verbose) {
4787 DWORD err = GetLastError();
4788 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4789 }
4790 CloseHandle(hFile);
4791 return base;
4792 }
4793 }
4794
4795 if (allow_exec) {
4796 DWORD old_protect;
4797 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4798 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4799
4800 if (!res) {
4801 if (PrintMiscellaneous && Verbose) {
4802 DWORD err = GetLastError();
4803 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4804 }
4805 // Don't consider this a hard error, on IA32 even if the
4806 // VirtualProtect fails, we should still be able to execute
4807 CloseHandle(hFile);
4808 return base;
4809 }
4810 }
4811
4812 if (CloseHandle(hFile) == 0) {
4813 if (PrintMiscellaneous && Verbose) {
4814 DWORD err = GetLastError();
4815 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4816 }
4817 return base;
4818 }
4819
4820 return base;
4821 }
4822
4823
4824 // Remap a block of memory.
4825 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4826 char *addr, size_t bytes, bool read_only,
4827 bool allow_exec) {
4828 // This OS does not allow existing memory maps to be remapped so we
4829 // have to unmap the memory before we remap it.
4830 if (!os::unmap_memory(addr, bytes)) {
4831 return NULL;
4832 }
4833
4834 // There is a very small theoretical window between the unmap_memory()
4835 // call above and the map_memory() call below where a thread in native
4836 // code may be able to access an address that is no longer mapped.
4837
4838 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4839 read_only, allow_exec);
4840 }
4841
4842
4843 // Unmap a block of memory.
4844 // Returns true=success, otherwise false.
4845
4846 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4847 BOOL result = UnmapViewOfFile(addr);
4848 if (result == 0) {
4849 if (PrintMiscellaneous && Verbose) {
4850 DWORD err = GetLastError();
4851 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4852 }
4853 return false;
4854 }
4855 return true;
4856 }
4857
4858 void os::pause() {
4859 char filename[MAX_PATH];
4860 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4861 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4862 } else {
4863 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4864 }
4865
4866 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4867 if (fd != -1) {
4868 struct stat buf;
4869 ::close(fd);
4870 while (::stat(filename, &buf) == 0) {
4871 Sleep(100);
4872 }
4873 } else {
4874 jio_fprintf(stderr,
4875 "Could not open pause file '%s', continuing immediately.\n", filename);
4876 }
4877 }
4878
4879 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4880 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4881 }
4882
4883 // See the caveats for this class in os_windows.hpp
4884 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4885 // into this method and returns false. If no OS EXCEPTION was raised, returns
4886 // true.
4887 // The callback is supposed to provide the method that should be protected.
4888 //
4889 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4890 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4891 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4892 "crash_protection already set?");
4893
4894 bool success = true;
4895 __try {
4896 WatcherThread::watcher_thread()->set_crash_protection(this);
4897 cb.call();
4898 } __except(EXCEPTION_EXECUTE_HANDLER) {
4899 // only for protection, nothing to do
4900 success = false;
4901 }
4902 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4903 return success;
4904 }
4905
4906 // An Event wraps a win32 "CreateEvent" kernel handle.
4907 //
4908 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4909 //
4910 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4911 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4912 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4913 // In addition, an unpark() operation might fetch the handle field, but the
4914 // event could recycle between the fetch and the SetEvent() operation.
4915 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4916 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4917 // on an stale but recycled handle would be harmless, but in practice this might
4918 // confuse other non-Sun code, so it's not a viable approach.
4919 //
4920 // 2: Once a win32 event handle is associated with an Event, it remains associated
4921 // with the Event. The event handle is never closed. This could be construed
4922 // as handle leakage, but only up to the maximum # of threads that have been extant
4923 // at any one time. This shouldn't be an issue, as windows platforms typically
4924 // permit a process to have hundreds of thousands of open handles.
4925 //
4926 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4927 // and release unused handles.
4928 //
4929 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4930 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4931 //
4932 // 5. Use an RCU-like mechanism (Read-Copy Update).
4933 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4934 //
4935 // We use (2).
4936 //
4937 // TODO-FIXME:
4938 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4939 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4940 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4941 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4942 // into a single win32 CreateEvent() handle.
4943 //
4944 // Assumption:
4945 // Only one parker can exist on an event, which is why we allocate
4946 // them per-thread. Multiple unparkers can coexist.
4947 //
4948 // _Event transitions in park()
4949 // -1 => -1 : illegal
4950 // 1 => 0 : pass - return immediately
4951 // 0 => -1 : block; then set _Event to 0 before returning
4952 //
4953 // _Event transitions in unpark()
4954 // 0 => 1 : just return
4955 // 1 => 1 : just return
4956 // -1 => either 0 or 1; must signal target thread
4957 // That is, we can safely transition _Event from -1 to either
4958 // 0 or 1.
4959 //
4960 // _Event serves as a restricted-range semaphore.
4961 // -1 : thread is blocked, i.e. there is a waiter
4962 // 0 : neutral: thread is running or ready,
4963 // could have been signaled after a wait started
4964 // 1 : signaled - thread is running or ready
4965 //
4966 // Another possible encoding of _Event would be with
4967 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4968 //
4969
4970 int os::PlatformEvent::park(jlong Millis) {
4971 // Transitions for _Event:
4972 // -1 => -1 : illegal
4973 // 1 => 0 : pass - return immediately
4974 // 0 => -1 : block; then set _Event to 0 before returning
4975
4976 guarantee(_ParkHandle != NULL , "Invariant");
4977 guarantee(Millis > 0 , "Invariant");
4978
4979 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4980 // the initial park() operation.
4981 // Consider: use atomic decrement instead of CAS-loop
4982
4983 int v;
4984 for (;;) {
4985 v = _Event;
4986 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4987 }
4988 guarantee((v == 0) || (v == 1), "invariant");
4989 if (v != 0) return OS_OK;
4990
4991 // Do this the hard way by blocking ...
4992 // TODO: consider a brief spin here, gated on the success of recent
4993 // spin attempts by this thread.
4994 //
4995 // We decompose long timeouts into series of shorter timed waits.
4996 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4997 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4998 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4999 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5000 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5001 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5002 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5003 // for the already waited time. This policy does not admit any new outcomes.
5004 // In the future, however, we might want to track the accumulated wait time and
5005 // adjust Millis accordingly if we encounter a spurious wakeup.
5006
5007 const int MAXTIMEOUT = 0x10000000;
5008 DWORD rv = WAIT_TIMEOUT;
5009 while (_Event < 0 && Millis > 0) {
5010 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5011 if (Millis > MAXTIMEOUT) {
5012 prd = MAXTIMEOUT;
5013 }
5014 rv = ::WaitForSingleObject(_ParkHandle, prd);
5015 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5016 if (rv == WAIT_TIMEOUT) {
5017 Millis -= prd;
5018 }
5019 }
5020 v = _Event;
5021 _Event = 0;
5022 // see comment at end of os::PlatformEvent::park() below:
5023 OrderAccess::fence();
5024 // If we encounter a nearly simultanous timeout expiry and unpark()
5025 // we return OS_OK indicating we awoke via unpark().
5026 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5027 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5028 }
5029
5030 void os::PlatformEvent::park() {
5031 // Transitions for _Event:
5032 // -1 => -1 : illegal
5033 // 1 => 0 : pass - return immediately
5034 // 0 => -1 : block; then set _Event to 0 before returning
5035
5036 guarantee(_ParkHandle != NULL, "Invariant");
5037 // Invariant: Only the thread associated with the Event/PlatformEvent
5038 // may call park().
5039 // Consider: use atomic decrement instead of CAS-loop
5040 int v;
5041 for (;;) {
5042 v = _Event;
5043 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5044 }
5045 guarantee((v == 0) || (v == 1), "invariant");
5046 if (v != 0) return;
5047
5048 // Do this the hard way by blocking ...
5049 // TODO: consider a brief spin here, gated on the success of recent
5050 // spin attempts by this thread.
5051 while (_Event < 0) {
5052 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5053 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5054 }
5055
5056 // Usually we'll find _Event == 0 at this point, but as
5057 // an optional optimization we clear it, just in case can
5058 // multiple unpark() operations drove _Event up to 1.
5059 _Event = 0;
5060 OrderAccess::fence();
5061 guarantee(_Event >= 0, "invariant");
5062 }
5063
5064 void os::PlatformEvent::unpark() {
5065 guarantee(_ParkHandle != NULL, "Invariant");
5066
5067 // Transitions for _Event:
5068 // 0 => 1 : just return
5069 // 1 => 1 : just return
5070 // -1 => either 0 or 1; must signal target thread
5071 // That is, we can safely transition _Event from -1 to either
5072 // 0 or 1.
5073 // See also: "Semaphores in Plan 9" by Mullender & Cox
5074 //
5075 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5076 // that it will take two back-to-back park() calls for the owning
5077 // thread to block. This has the benefit of forcing a spurious return
5078 // from the first park() call after an unpark() call which will help
5079 // shake out uses of park() and unpark() without condition variables.
5080
5081 if (Atomic::xchg(1, &_Event) >= 0) return;
5082
5083 ::SetEvent(_ParkHandle);
5084 }
5085
5086
5087 // JSR166
5088 // -------------------------------------------------------
5089
5090 // The Windows implementation of Park is very straightforward: Basic
5091 // operations on Win32 Events turn out to have the right semantics to
5092 // use them directly. We opportunistically resuse the event inherited
5093 // from Monitor.
5094
5095 void Parker::park(bool isAbsolute, jlong time) {
5096 guarantee(_ParkEvent != NULL, "invariant");
5097 // First, demultiplex/decode time arguments
5098 if (time < 0) { // don't wait
5099 return;
5100 } else if (time == 0 && !isAbsolute) {
5101 time = INFINITE;
5102 } else if (isAbsolute) {
5103 time -= os::javaTimeMillis(); // convert to relative time
5104 if (time <= 0) { // already elapsed
5105 return;
5106 }
5107 } else { // relative
5108 time /= 1000000; // Must coarsen from nanos to millis
5109 if (time == 0) { // Wait for the minimal time unit if zero
5110 time = 1;
5111 }
5112 }
5113
5114 JavaThread* thread = (JavaThread*)(Thread::current());
5115 assert(thread->is_Java_thread(), "Must be JavaThread");
5116 JavaThread *jt = (JavaThread *)thread;
5117
5118 // Don't wait if interrupted or already triggered
5119 if (Thread::is_interrupted(thread, false) ||
5120 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5121 ResetEvent(_ParkEvent);
5122 return;
5123 } else {
5124 ThreadBlockInVM tbivm(jt);
5125 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5126 jt->set_suspend_equivalent();
5127
5128 WaitForSingleObject(_ParkEvent, time);
5129 ResetEvent(_ParkEvent);
5130
5131 // If externally suspended while waiting, re-suspend
5132 if (jt->handle_special_suspend_equivalent_condition()) {
5133 jt->java_suspend_self();
5134 }
5135 }
5136 }
5137
5138 void Parker::unpark() {
5139 guarantee(_ParkEvent != NULL, "invariant");
5140 SetEvent(_ParkEvent);
5141 }
5142
5143 // Run the specified command in a separate process. Return its exit value,
5144 // or -1 on failure (e.g. can't create a new process).
5145 int os::fork_and_exec(char* cmd) {
5146 STARTUPINFO si;
5147 PROCESS_INFORMATION pi;
5148
5149 memset(&si, 0, sizeof(si));
5150 si.cb = sizeof(si);
5151 memset(&pi, 0, sizeof(pi));
5152 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5153 cmd, // command line
5154 NULL, // process security attribute
5155 NULL, // thread security attribute
5156 TRUE, // inherits system handles
5157 0, // no creation flags
5158 NULL, // use parent's environment block
5159 NULL, // use parent's starting directory
5160 &si, // (in) startup information
5161 &pi); // (out) process information
5162
5163 if (rslt) {
5164 // Wait until child process exits.
5165 WaitForSingleObject(pi.hProcess, INFINITE);
5166
5167 DWORD exit_code;
5168 GetExitCodeProcess(pi.hProcess, &exit_code);
5169
5170 // Close process and thread handles.
5171 CloseHandle(pi.hProcess);
5172 CloseHandle(pi.hThread);
5173
5174 return (int)exit_code;
5175 } else {
5176 return -1;
5177 }
5178 }
5179
5180 //--------------------------------------------------------------------------------------------------
5181 // Non-product code
5182
5183 static int mallocDebugIntervalCounter = 0;
5184 static int mallocDebugCounter = 0;
5185 bool os::check_heap(bool force) {
5186 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5187 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5188 // Note: HeapValidate executes two hardware breakpoints when it finds something
5189 // wrong; at these points, eax contains the address of the offending block (I think).
5190 // To get to the exlicit error message(s) below, just continue twice.
5191 HANDLE heap = GetProcessHeap();
5192
5193 // If we fail to lock the heap, then gflags.exe has been used
5194 // or some other special heap flag has been set that prevents
5195 // locking. We don't try to walk a heap we can't lock.
5196 if (HeapLock(heap) != 0) {
5197 PROCESS_HEAP_ENTRY phe;
5198 phe.lpData = NULL;
5199 while (HeapWalk(heap, &phe) != 0) {
5200 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5201 !HeapValidate(heap, 0, phe.lpData)) {
5202 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5203 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5204 fatal("corrupted C heap");
5205 }
5206 }
5207 DWORD err = GetLastError();
5208 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5209 fatal(err_msg("heap walk aborted with error %d", err));
5210 }
5211 HeapUnlock(heap);
5212 }
5213 mallocDebugIntervalCounter = 0;
5214 }
5215 return true;
5216 }
5217
5218
5219 bool os::find(address addr, outputStream* st) {
5220 // Nothing yet
5221 return false;
5222 }
5223
5224 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5225 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5226
5227 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5228 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5229 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5230 address addr = (address) exceptionRecord->ExceptionInformation[1];
5231
5232 if (os::is_memory_serialize_page(thread, addr)) {
5233 return EXCEPTION_CONTINUE_EXECUTION;
5234 }
5235 }
5236
5237 return EXCEPTION_CONTINUE_SEARCH;
5238 }
5239
5240 // We don't build a headless jre for Windows
5241 bool os::is_headless_jre() { return false; }
5242
5243 static jint initSock() {
5244 WSADATA wsadata;
5245
5246 if (!os::WinSock2Dll::WinSock2Available()) {
5247 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5248 ::GetLastError());
5249 return JNI_ERR;
5250 }
5251
5252 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5253 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5254 ::GetLastError());
5255 return JNI_ERR;
5256 }
5257 return JNI_OK;
5258 }
5259
5260 struct hostent* os::get_host_by_name(char* name) {
5261 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5262 }
5263
5264 int os::socket_close(int fd) {
5265 return ::closesocket(fd);
5266 }
5267
5268 int os::socket(int domain, int type, int protocol) {
5269 return ::socket(domain, type, protocol);
5270 }
5271
5272 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5273 return ::connect(fd, him, len);
5274 }
5275
5276 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5277 return ::recv(fd, buf, (int)nBytes, flags);
5278 }
5279
5280 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5281 return ::send(fd, buf, (int)nBytes, flags);
5282 }
5283
5284 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5285 return ::send(fd, buf, (int)nBytes, flags);
5286 }
5287
5288 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5289 #if defined(IA32)
5290 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5291 #elif defined (AMD64)
5292 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5293 #endif
5294
5295 // returns true if thread could be suspended,
5296 // false otherwise
5297 static bool do_suspend(HANDLE* h) {
5298 if (h != NULL) {
5299 if (SuspendThread(*h) != ~0) {
5300 return true;
5301 }
5302 }
5303 return false;
5304 }
5305
5306 // resume the thread
5307 // calling resume on an active thread is a no-op
5308 static void do_resume(HANDLE* h) {
5309 if (h != NULL) {
5310 ResumeThread(*h);
5311 }
5312 }
5313
5314 // retrieve a suspend/resume context capable handle
5315 // from the tid. Caller validates handle return value.
5316 void get_thread_handle_for_extended_context(HANDLE* h,
5317 OSThread::thread_id_t tid) {
5318 if (h != NULL) {
5319 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5320 }
5321 }
5322
5323 // Thread sampling implementation
5324 //
5325 void os::SuspendedThreadTask::internal_do_task() {
5326 CONTEXT ctxt;
5327 HANDLE h = NULL;
5328
5329 // get context capable handle for thread
5330 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5331
5332 // sanity
5333 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5334 return;
5335 }
5336
5337 // suspend the thread
5338 if (do_suspend(&h)) {
5339 ctxt.ContextFlags = sampling_context_flags;
5340 // get thread context
5341 GetThreadContext(h, &ctxt);
5342 SuspendedThreadTaskContext context(_thread, &ctxt);
5343 // pass context to Thread Sampling impl
5344 do_task(context);
5345 // resume thread
5346 do_resume(&h);
5347 }
5348
5349 // close handle
5350 CloseHandle(h);
5351 }
5352
5353
5354 // Kernel32 API
5355 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5356 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5357 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5358 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5359 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5360
5361 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5362 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5363 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5364 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5365 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5366
5367
5368 BOOL os::Kernel32Dll::initialized = FALSE;
5369 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5370 assert(initialized && _GetLargePageMinimum != NULL,
5371 "GetLargePageMinimumAvailable() not yet called");
5372 return _GetLargePageMinimum();
5373 }
5374
5375 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5376 if (!initialized) {
5377 initialize();
5378 }
5379 return _GetLargePageMinimum != NULL;
5380 }
5381
5382 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5383 if (!initialized) {
5384 initialize();
5385 }
5386 return _VirtualAllocExNuma != NULL;
5387 }
5388
5389 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5390 SIZE_T bytes, DWORD flags,
5391 DWORD prot, DWORD node) {
5392 assert(initialized && _VirtualAllocExNuma != NULL,
5393 "NUMACallsAvailable() not yet called");
5394
5395 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5396 }
5397
5398 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5399 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5400 "NUMACallsAvailable() not yet called");
5401
5402 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5403 }
5404
5405 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5406 PULONGLONG proc_mask) {
5407 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5408 "NUMACallsAvailable() not yet called");
5409
5410 return _GetNumaNodeProcessorMask(node, proc_mask);
5411 }
5412
5413 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5414 ULONG FrameToCapture,
5415 PVOID* BackTrace,
5416 PULONG BackTraceHash) {
5417 if (!initialized) {
5418 initialize();
5419 }
5420
5421 if (_RtlCaptureStackBackTrace != NULL) {
5422 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5423 BackTrace, BackTraceHash);
5424 } else {
5425 return 0;
5426 }
5427 }
5428
5429 void os::Kernel32Dll::initializeCommon() {
5430 if (!initialized) {
5431 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5432 assert(handle != NULL, "Just check");
5433 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5434 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5435 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5436 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5437 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5438 initialized = TRUE;
5439 }
5440 }
5441
5442
5443
5444 #ifndef JDK6_OR_EARLIER
5445
5446 void os::Kernel32Dll::initialize() {
5447 initializeCommon();
5448 }
5449
5450
5451 // Kernel32 API
5452 inline BOOL os::Kernel32Dll::SwitchToThread() {
5453 return ::SwitchToThread();
5454 }
5455
5456 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5457 return true;
5458 }
5459
5460 // Help tools
5461 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5462 return true;
5463 }
5464
5465 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5466 DWORD th32ProcessId) {
5467 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5468 }
5469
5470 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5471 LPMODULEENTRY32 lpme) {
5472 return ::Module32First(hSnapshot, lpme);
5473 }
5474
5475 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5476 LPMODULEENTRY32 lpme) {
5477 return ::Module32Next(hSnapshot, lpme);
5478 }
5479
5480 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5481 ::GetNativeSystemInfo(lpSystemInfo);
5482 }
5483
5484 // PSAPI API
5485 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5486 HMODULE *lpModule, DWORD cb,
5487 LPDWORD lpcbNeeded) {
5488 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5489 }
5490
5491 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5492 HMODULE hModule,
5493 LPTSTR lpFilename,
5494 DWORD nSize) {
5495 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5496 }
5497
5498 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5499 HMODULE hModule,
5500 LPMODULEINFO lpmodinfo,
5501 DWORD cb) {
5502 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5503 }
5504
5505 inline BOOL os::PSApiDll::PSApiAvailable() {
5506 return true;
5507 }
5508
5509
5510 // WinSock2 API
5511 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5512 LPWSADATA lpWSAData) {
5513 return ::WSAStartup(wVersionRequested, lpWSAData);
5514 }
5515
5516 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5517 return ::gethostbyname(name);
5518 }
5519
5520 inline BOOL os::WinSock2Dll::WinSock2Available() {
5521 return true;
5522 }
5523
5524 // Advapi API
5525 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5526 BOOL DisableAllPrivileges,
5527 PTOKEN_PRIVILEGES NewState,
5528 DWORD BufferLength,
5529 PTOKEN_PRIVILEGES PreviousState,
5530 PDWORD ReturnLength) {
5531 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5532 BufferLength, PreviousState, ReturnLength);
5533 }
5534
5535 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5536 DWORD DesiredAccess,
5537 PHANDLE TokenHandle) {
5538 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5539 }
5540
5541 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5542 LPCTSTR lpName,
5543 PLUID lpLuid) {
5544 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5545 }
5546
5547 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5548 return true;
5549 }
5550
5551 void* os::get_default_process_handle() {
5552 return (void*)GetModuleHandle(NULL);
5553 }
5554
5555 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5556 // which is used to find statically linked in agents.
5557 // Additionally for windows, takes into account __stdcall names.
5558 // Parameters:
5559 // sym_name: Symbol in library we are looking for
5560 // lib_name: Name of library to look in, NULL for shared libs.
5561 // is_absolute_path == true if lib_name is absolute path to agent
5562 // such as "C:/a/b/L.dll"
5563 // == false if only the base name of the library is passed in
5564 // such as "L"
5565 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5566 bool is_absolute_path) {
5567 char *agent_entry_name;
5568 size_t len;
5569 size_t name_len;
5570 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5571 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5572 const char *start;
5573
5574 if (lib_name != NULL) {
5575 len = name_len = strlen(lib_name);
5576 if (is_absolute_path) {
5577 // Need to strip path, prefix and suffix
5578 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5579 lib_name = ++start;
5580 } else {
5581 // Need to check for drive prefix
5582 if ((start = strchr(lib_name, ':')) != NULL) {
5583 lib_name = ++start;
5584 }
5585 }
5586 if (len <= (prefix_len + suffix_len)) {
5587 return NULL;
5588 }
5589 lib_name += prefix_len;
5590 name_len = strlen(lib_name) - suffix_len;
5591 }
5592 }
5593 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5594 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5595 if (agent_entry_name == NULL) {
5596 return NULL;
5597 }
5598 if (lib_name != NULL) {
5599 const char *p = strrchr(sym_name, '@');
5600 if (p != NULL && p != sym_name) {
5601 // sym_name == _Agent_OnLoad@XX
5602 strncpy(agent_entry_name, sym_name, (p - sym_name));
5603 agent_entry_name[(p-sym_name)] = '\0';
5604 // agent_entry_name == _Agent_OnLoad
5605 strcat(agent_entry_name, "_");
5606 strncat(agent_entry_name, lib_name, name_len);
5607 strcat(agent_entry_name, p);
5608 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5609 } else {
5610 strcpy(agent_entry_name, sym_name);
5611 strcat(agent_entry_name, "_");
5612 strncat(agent_entry_name, lib_name, name_len);
5613 }
5614 } else {
5615 strcpy(agent_entry_name, sym_name);
5616 }
5617 return agent_entry_name;
5618 }
5619
5620 #else
5621 // Kernel32 API
5622 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5623 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5624 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5625 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5626 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5627
5628 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5629 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5630 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5631 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5632 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5633
5634 void os::Kernel32Dll::initialize() {
5635 if (!initialized) {
5636 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5637 assert(handle != NULL, "Just check");
5638
5639 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5640 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5641 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5642 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5643 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5644 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5645 initializeCommon(); // resolve the functions that always need resolving
5646
5647 initialized = TRUE;
5648 }
5649 }
5650
5651 BOOL os::Kernel32Dll::SwitchToThread() {
5652 assert(initialized && _SwitchToThread != NULL,
5653 "SwitchToThreadAvailable() not yet called");
5654 return _SwitchToThread();
5655 }
5656
5657
5658 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5659 if (!initialized) {
5660 initialize();
5661 }
5662 return _SwitchToThread != NULL;
5663 }
5664
5665 // Help tools
5666 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5667 if (!initialized) {
5668 initialize();
5669 }
5670 return _CreateToolhelp32Snapshot != NULL &&
5671 _Module32First != NULL &&
5672 _Module32Next != NULL;
5673 }
5674
5675 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5676 DWORD th32ProcessId) {
5677 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5678 "HelpToolsAvailable() not yet called");
5679
5680 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5681 }
5682
5683 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5684 assert(initialized && _Module32First != NULL,
5685 "HelpToolsAvailable() not yet called");
5686
5687 return _Module32First(hSnapshot, lpme);
5688 }
5689
5690 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5691 LPMODULEENTRY32 lpme) {
5692 assert(initialized && _Module32Next != NULL,
5693 "HelpToolsAvailable() not yet called");
5694
5695 return _Module32Next(hSnapshot, lpme);
5696 }
5697
5698
5699 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5700 if (!initialized) {
5701 initialize();
5702 }
5703 return _GetNativeSystemInfo != NULL;
5704 }
5705
5706 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5707 assert(initialized && _GetNativeSystemInfo != NULL,
5708 "GetNativeSystemInfoAvailable() not yet called");
5709
5710 _GetNativeSystemInfo(lpSystemInfo);
5711 }
5712
5713 // PSAPI API
5714
5715
5716 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5717 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5718 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5719
5720 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5721 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5722 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5723 BOOL os::PSApiDll::initialized = FALSE;
5724
5725 void os::PSApiDll::initialize() {
5726 if (!initialized) {
5727 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5728 if (handle != NULL) {
5729 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5730 "EnumProcessModules");
5731 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5732 "GetModuleFileNameExA");
5733 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5734 "GetModuleInformation");
5735 }
5736 initialized = TRUE;
5737 }
5738 }
5739
5740
5741
5742 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5743 DWORD cb, LPDWORD lpcbNeeded) {
5744 assert(initialized && _EnumProcessModules != NULL,
5745 "PSApiAvailable() not yet called");
5746 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5747 }
5748
5749 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5750 LPTSTR lpFilename, DWORD nSize) {
5751 assert(initialized && _GetModuleFileNameEx != NULL,
5752 "PSApiAvailable() not yet called");
5753 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5754 }
5755
5756 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5757 LPMODULEINFO lpmodinfo, DWORD cb) {
5758 assert(initialized && _GetModuleInformation != NULL,
5759 "PSApiAvailable() not yet called");
5760 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5761 }
5762
5763 BOOL os::PSApiDll::PSApiAvailable() {
5764 if (!initialized) {
5765 initialize();
5766 }
5767 return _EnumProcessModules != NULL &&
5768 _GetModuleFileNameEx != NULL &&
5769 _GetModuleInformation != NULL;
5770 }
5771
5772
5773 // WinSock2 API
5774 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5775 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5776
5777 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5778 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5779 BOOL os::WinSock2Dll::initialized = FALSE;
5780
5781 void os::WinSock2Dll::initialize() {
5782 if (!initialized) {
5783 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5784 if (handle != NULL) {
5785 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5786 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5787 }
5788 initialized = TRUE;
5789 }
5790 }
5791
5792
5793 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5794 assert(initialized && _WSAStartup != NULL,
5795 "WinSock2Available() not yet called");
5796 return _WSAStartup(wVersionRequested, lpWSAData);
5797 }
5798
5799 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5800 assert(initialized && _gethostbyname != NULL,
5801 "WinSock2Available() not yet called");
5802 return _gethostbyname(name);
5803 }
5804
5805 BOOL os::WinSock2Dll::WinSock2Available() {
5806 if (!initialized) {
5807 initialize();
5808 }
5809 return _WSAStartup != NULL &&
5810 _gethostbyname != NULL;
5811 }
5812
5813 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5814 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5815 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5816
5817 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5818 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5819 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5820 BOOL os::Advapi32Dll::initialized = FALSE;
5821
5822 void os::Advapi32Dll::initialize() {
5823 if (!initialized) {
5824 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5825 if (handle != NULL) {
5826 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5827 "AdjustTokenPrivileges");
5828 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5829 "OpenProcessToken");
5830 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5831 "LookupPrivilegeValueA");
5832 }
5833 initialized = TRUE;
5834 }
5835 }
5836
5837 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5838 BOOL DisableAllPrivileges,
5839 PTOKEN_PRIVILEGES NewState,
5840 DWORD BufferLength,
5841 PTOKEN_PRIVILEGES PreviousState,
5842 PDWORD ReturnLength) {
5843 assert(initialized && _AdjustTokenPrivileges != NULL,
5844 "AdvapiAvailable() not yet called");
5845 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5846 BufferLength, PreviousState, ReturnLength);
5847 }
5848
5849 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5850 DWORD DesiredAccess,
5851 PHANDLE TokenHandle) {
5852 assert(initialized && _OpenProcessToken != NULL,
5853 "AdvapiAvailable() not yet called");
5854 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5855 }
5856
5857 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5858 LPCTSTR lpName, PLUID lpLuid) {
5859 assert(initialized && _LookupPrivilegeValue != NULL,
5860 "AdvapiAvailable() not yet called");
5861 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5862 }
5863
5864 BOOL os::Advapi32Dll::AdvapiAvailable() {
5865 if (!initialized) {
5866 initialize();
5867 }
5868 return _AdjustTokenPrivileges != NULL &&
5869 _OpenProcessToken != NULL &&
5870 _LookupPrivilegeValue != NULL;
5871 }
5872
5873 #endif
5874
5875 #ifndef PRODUCT
5876
5877 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5878 // contiguous memory block at a particular address.
5879 // The test first tries to find a good approximate address to allocate at by using the same
5880 // method to allocate some memory at any address. The test then tries to allocate memory in
5881 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5882 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5883 // the previously allocated memory is available for allocation. The only actual failure
5884 // that is reported is when the test tries to allocate at a particular location but gets a
5885 // different valid one. A NULL return value at this point is not considered an error but may
5886 // be legitimate.
5887 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5888 void TestReserveMemorySpecial_test() {
5889 if (!UseLargePages) {
5890 if (VerboseInternalVMTests) {
5891 gclog_or_tty->print("Skipping test because large pages are disabled");
5892 }
5893 return;
5894 }
5895 // save current value of globals
5896 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5897 bool old_use_numa_interleaving = UseNUMAInterleaving;
5898
5899 // set globals to make sure we hit the correct code path
5900 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5901
5902 // do an allocation at an address selected by the OS to get a good one.
5903 const size_t large_allocation_size = os::large_page_size() * 4;
5904 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5905 if (result == NULL) {
5906 if (VerboseInternalVMTests) {
5907 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5908 large_allocation_size);
5909 }
5910 } else {
5911 os::release_memory_special(result, large_allocation_size);
5912
5913 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5914 // we managed to get it once.
5915 const size_t expected_allocation_size = os::large_page_size();
5916 char* expected_location = result + os::large_page_size();
5917 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5918 if (actual_location == NULL) {
5919 if (VerboseInternalVMTests) {
5920 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5921 expected_location, large_allocation_size);
5922 }
5923 } else {
5924 // release memory
5925 os::release_memory_special(actual_location, expected_allocation_size);
5926 // only now check, after releasing any memory to avoid any leaks.
5927 assert(actual_location == expected_location,
5928 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5929 expected_location, expected_allocation_size, actual_location));
5930 }
5931 }
5932
5933 // restore globals
5934 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5935 UseNUMAInterleaving = old_use_numa_interleaving;
5936 }
5937 #endif // PRODUCT
5938