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 "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 OSThread* osthr = thread->osthread();
423 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
424
425 if (UseNUMA) {
426 int lgrp_id = os::numa_get_group_id();
427 if (lgrp_id != -1) {
428 thread->set_lgrp_id(lgrp_id);
429 }
430 }
431
432 // Diagnostic code to investigate JDK-6573254
433 int res = 30115; // non-java thread
434 if (thread->is_Java_thread()) {
435 res = 20115; // java thread
436 }
437
438 // Install a win32 structured exception handler around every thread created
439 // by VM, so VM can generate error dump when an exception occurred in non-
440 // Java thread (e.g. VM thread).
441 __try {
442 thread->run();
443 } __except(topLevelExceptionFilter(
444 (_EXCEPTION_POINTERS*)_exception_info())) {
445 // Nothing to do.
446 }
447
448 // One less thread is executing
449 // When the VMThread gets here, the main thread may have already exited
450 // which frees the CodeHeap containing the Atomic::add code
451 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
452 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
453 }
454
455 // Thread must not return from exit_process_or_thread(), but if it does,
456 // let it proceed to exit normally
457 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
458 }
459
460 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
461 int thread_id) {
462 // Allocate the OSThread object
463 OSThread* osthread = new OSThread(NULL, NULL);
464 if (osthread == NULL) return NULL;
465
466 // Initialize support for Java interrupts
467 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
468 if (interrupt_event == NULL) {
469 delete osthread;
470 return NULL;
471 }
472 osthread->set_interrupt_event(interrupt_event);
473
474 // Store info on the Win32 thread into the OSThread
475 osthread->set_thread_handle(thread_handle);
476 osthread->set_thread_id(thread_id);
477
478 if (UseNUMA) {
479 int lgrp_id = os::numa_get_group_id();
480 if (lgrp_id != -1) {
481 thread->set_lgrp_id(lgrp_id);
482 }
483 }
484
485 // Initial thread state is INITIALIZED, not SUSPENDED
486 osthread->set_state(INITIALIZED);
487
488 return osthread;
489 }
490
491
492 bool os::create_attached_thread(JavaThread* thread) {
493 #ifdef ASSERT
494 thread->verify_not_published();
495 #endif
496 HANDLE thread_h;
497 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
498 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
499 fatal("DuplicateHandle failed\n");
500 }
501 OSThread* osthread = create_os_thread(thread, thread_h,
502 (int)current_thread_id());
503 if (osthread == NULL) {
504 return false;
505 }
506
507 // Initial thread state is RUNNABLE
508 osthread->set_state(RUNNABLE);
509
510 thread->set_osthread(osthread);
511 return true;
512 }
513
514 bool os::create_main_thread(JavaThread* thread) {
515 #ifdef ASSERT
516 thread->verify_not_published();
517 #endif
518 if (_starting_thread == NULL) {
519 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
520 if (_starting_thread == NULL) {
521 return false;
522 }
523 }
524
525 // The primordial thread is runnable from the start)
526 _starting_thread->set_state(RUNNABLE);
527
528 thread->set_osthread(_starting_thread);
529 return true;
530 }
531
532 // Allocate and initialize a new OSThread
533 bool os::create_thread(Thread* thread, ThreadType thr_type,
534 size_t stack_size) {
535 unsigned thread_id;
536
537 // Allocate the OSThread object
538 OSThread* osthread = new OSThread(NULL, NULL);
539 if (osthread == NULL) {
540 return false;
541 }
542
543 // Initialize support for Java interrupts
544 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
545 if (interrupt_event == NULL) {
546 delete osthread;
547 return NULL;
548 }
549 osthread->set_interrupt_event(interrupt_event);
550 osthread->set_interrupted(false);
551
552 thread->set_osthread(osthread);
553
554 if (stack_size == 0) {
555 switch (thr_type) {
556 case os::java_thread:
557 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
558 if (JavaThread::stack_size_at_create() > 0) {
559 stack_size = JavaThread::stack_size_at_create();
560 }
561 break;
562 case os::compiler_thread:
563 if (CompilerThreadStackSize > 0) {
564 stack_size = (size_t)(CompilerThreadStackSize * K);
565 break;
566 } // else fall through:
567 // use VMThreadStackSize if CompilerThreadStackSize is not defined
568 case os::vm_thread:
569 case os::pgc_thread:
570 case os::cgc_thread:
571 case os::watcher_thread:
572 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
573 break;
574 }
575 }
576
577 // Create the Win32 thread
578 //
579 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
580 // does not specify stack size. Instead, it specifies the size of
581 // initially committed space. The stack size is determined by
582 // PE header in the executable. If the committed "stack_size" is larger
583 // than default value in the PE header, the stack is rounded up to the
584 // nearest multiple of 1MB. For example if the launcher has default
585 // stack size of 320k, specifying any size less than 320k does not
586 // affect the actual stack size at all, it only affects the initial
587 // commitment. On the other hand, specifying 'stack_size' larger than
588 // default value may cause significant increase in memory usage, because
589 // not only the stack space will be rounded up to MB, but also the
590 // entire space is committed upfront.
591 //
592 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
593 // for CreateThread() that can treat 'stack_size' as stack size. However we
594 // are not supposed to call CreateThread() directly according to MSDN
595 // document because JVM uses C runtime library. The good news is that the
596 // flag appears to work with _beginthredex() as well.
597
598 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
599 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
600 #endif
601
602 HANDLE thread_handle =
603 (HANDLE)_beginthreadex(NULL,
604 (unsigned)stack_size,
605 (unsigned (__stdcall *)(void*)) java_start,
606 thread,
607 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
608 &thread_id);
609 if (thread_handle == NULL) {
610 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
611 // without the flag.
612 thread_handle =
613 (HANDLE)_beginthreadex(NULL,
614 (unsigned)stack_size,
615 (unsigned (__stdcall *)(void*)) java_start,
616 thread,
617 CREATE_SUSPENDED,
618 &thread_id);
619 }
620 if (thread_handle == NULL) {
621 // Need to clean up stuff we've allocated so far
622 CloseHandle(osthread->interrupt_event());
623 thread->set_osthread(NULL);
624 delete osthread;
625 return NULL;
626 }
627
628 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
629
630 // Store info on the Win32 thread into the OSThread
631 osthread->set_thread_handle(thread_handle);
632 osthread->set_thread_id(thread_id);
633
634 // Initial thread state is INITIALIZED, not SUSPENDED
635 osthread->set_state(INITIALIZED);
636
637 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
638 return true;
639 }
640
641
642 // Free Win32 resources related to the OSThread
643 void os::free_thread(OSThread* osthread) {
644 assert(osthread != NULL, "osthread not set");
645 CloseHandle(osthread->thread_handle());
646 CloseHandle(osthread->interrupt_event());
647 delete osthread;
648 }
649
650 static jlong first_filetime;
651 static jlong initial_performance_count;
652 static jlong performance_frequency;
653
654
655 jlong as_long(LARGE_INTEGER x) {
656 jlong result = 0; // initialization to avoid warning
657 set_high(&result, x.HighPart);
658 set_low(&result, x.LowPart);
659 return result;
660 }
661
662
663 jlong os::elapsed_counter() {
664 LARGE_INTEGER count;
665 if (win32::_has_performance_count) {
666 QueryPerformanceCounter(&count);
667 return as_long(count) - initial_performance_count;
668 } else {
669 FILETIME wt;
670 GetSystemTimeAsFileTime(&wt);
671 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
672 }
673 }
674
675
676 jlong os::elapsed_frequency() {
677 if (win32::_has_performance_count) {
678 return performance_frequency;
679 } else {
680 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
681 return 10000000;
682 }
683 }
684
685
686 julong os::available_memory() {
687 return win32::available_memory();
688 }
689
690 julong os::win32::available_memory() {
691 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
692 // value if total memory is larger than 4GB
693 MEMORYSTATUSEX ms;
694 ms.dwLength = sizeof(ms);
695 GlobalMemoryStatusEx(&ms);
696
697 return (julong)ms.ullAvailPhys;
698 }
699
700 julong os::physical_memory() {
701 return win32::physical_memory();
702 }
703
704 bool os::has_allocatable_memory_limit(julong* limit) {
705 MEMORYSTATUSEX ms;
706 ms.dwLength = sizeof(ms);
707 GlobalMemoryStatusEx(&ms);
708 #ifdef _LP64
709 *limit = (julong)ms.ullAvailVirtual;
710 return true;
711 #else
712 // Limit to 1400m because of the 2gb address space wall
713 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
714 return true;
715 #endif
716 }
717
718 // VC6 lacks DWORD_PTR
719 #if _MSC_VER < 1300
720 typedef UINT_PTR DWORD_PTR;
721 #endif
722
723 int os::active_processor_count() {
724 DWORD_PTR lpProcessAffinityMask = 0;
725 DWORD_PTR lpSystemAffinityMask = 0;
726 int proc_count = processor_count();
727 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
728 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
729 // Nof active processors is number of bits in process affinity mask
730 int bitcount = 0;
731 while (lpProcessAffinityMask != 0) {
732 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
733 bitcount++;
734 }
735 return bitcount;
736 } else {
737 return proc_count;
738 }
739 }
740
741 void os::set_native_thread_name(const char *name) {
742
743 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
744 //
745 // Note that unfortunately this only works if the process
746 // is already attached to a debugger; debugger must observe
747 // the exception below to show the correct name.
748
749 const DWORD MS_VC_EXCEPTION = 0x406D1388;
750 struct {
751 DWORD dwType; // must be 0x1000
752 LPCSTR szName; // pointer to name (in user addr space)
753 DWORD dwThreadID; // thread ID (-1=caller thread)
754 DWORD dwFlags; // reserved for future use, must be zero
755 } info;
756
757 info.dwType = 0x1000;
758 info.szName = name;
759 info.dwThreadID = -1;
760 info.dwFlags = 0;
761
762 __try {
763 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
764 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
765 }
766
767 bool os::distribute_processes(uint length, uint* distribution) {
768 // Not yet implemented.
769 return false;
770 }
771
772 bool os::bind_to_processor(uint processor_id) {
773 // Not yet implemented.
774 return false;
775 }
776
777 void os::win32::initialize_performance_counter() {
778 LARGE_INTEGER count;
779 if (QueryPerformanceFrequency(&count)) {
780 win32::_has_performance_count = 1;
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 } else {
785 win32::_has_performance_count = 0;
786 FILETIME wt;
787 GetSystemTimeAsFileTime(&wt);
788 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
789 }
790 }
791
792
793 double os::elapsedTime() {
794 return (double) elapsed_counter() / (double) elapsed_frequency();
795 }
796
797
798 // Windows format:
799 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
800 // Java format:
801 // Java standards require the number of milliseconds since 1/1/1970
802
803 // Constant offset - calculated using offset()
804 static jlong _offset = 116444736000000000;
805 // Fake time counter for reproducible results when debugging
806 static jlong fake_time = 0;
807
808 #ifdef ASSERT
809 // Just to be safe, recalculate the offset in debug mode
810 static jlong _calculated_offset = 0;
811 static int _has_calculated_offset = 0;
812
813 jlong offset() {
814 if (_has_calculated_offset) return _calculated_offset;
815 SYSTEMTIME java_origin;
816 java_origin.wYear = 1970;
817 java_origin.wMonth = 1;
818 java_origin.wDayOfWeek = 0; // ignored
819 java_origin.wDay = 1;
820 java_origin.wHour = 0;
821 java_origin.wMinute = 0;
822 java_origin.wSecond = 0;
823 java_origin.wMilliseconds = 0;
824 FILETIME jot;
825 if (!SystemTimeToFileTime(&java_origin, &jot)) {
826 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
827 }
828 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
829 _has_calculated_offset = 1;
830 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
831 return _calculated_offset;
832 }
833 #else
834 jlong offset() {
835 return _offset;
836 }
837 #endif
838
839 jlong windows_to_java_time(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset()) / 10000;
842 }
843
844 // Returns time ticks in (10th of micro seconds)
845 jlong windows_to_time_ticks(FILETIME wt) {
846 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
847 return (a - offset());
848 }
849
850 FILETIME java_to_windows_time(jlong l) {
851 jlong a = (l * 10000) + offset();
852 FILETIME result;
853 result.dwHighDateTime = high(a);
854 result.dwLowDateTime = low(a);
855 return result;
856 }
857
858 bool os::supports_vtime() { return true; }
859 bool os::enable_vtime() { return false; }
860 bool os::vtime_enabled() { return false; }
861
862 double os::elapsedVTime() {
863 FILETIME created;
864 FILETIME exited;
865 FILETIME kernel;
866 FILETIME user;
867 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
868 // the resolution of windows_to_java_time() should be sufficient (ms)
869 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
870 } else {
871 return elapsedTime();
872 }
873 }
874
875 jlong os::javaTimeMillis() {
876 if (UseFakeTimers) {
877 return fake_time++;
878 } else {
879 FILETIME wt;
880 GetSystemTimeAsFileTime(&wt);
881 return windows_to_java_time(wt);
882 }
883 }
884
885 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
886 FILETIME wt;
887 GetSystemTimeAsFileTime(&wt);
888 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
889 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
890 seconds = secs;
891 nanos = jlong(ticks - (secs*10000000)) * 100;
892 }
893
894 jlong os::javaTimeNanos() {
895 if (!win32::_has_performance_count) {
896 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
897 } else {
898 LARGE_INTEGER current_count;
899 QueryPerformanceCounter(¤t_count);
900 double current = as_long(current_count);
901 double freq = performance_frequency;
902 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
903 return time;
904 }
905 }
906
907 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
908 if (!win32::_has_performance_count) {
909 // javaTimeMillis() doesn't have much percision,
910 // but it is not going to wrap -- so all 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912
913 // this is a wall clock timer, so may skip
914 info_ptr->may_skip_backward = true;
915 info_ptr->may_skip_forward = true;
916 } else {
917 jlong freq = performance_frequency;
918 if (freq < NANOSECS_PER_SEC) {
919 // the performance counter is 64 bits and we will
920 // be multiplying it -- so no wrap in 64 bits
921 info_ptr->max_value = ALL_64_BITS;
922 } else if (freq > NANOSECS_PER_SEC) {
923 // use the max value the counter can reach to
924 // determine the max value which could be returned
925 julong max_counter = (julong)ALL_64_BITS;
926 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
927 } else {
928 // the performance counter is 64 bits and we will
929 // be using it directly -- so no wrap in 64 bits
930 info_ptr->max_value = ALL_64_BITS;
931 }
932
933 // using a counter, so no skipping
934 info_ptr->may_skip_backward = false;
935 info_ptr->may_skip_forward = false;
936 }
937 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
938 }
939
940 char* os::local_time_string(char *buf, size_t buflen) {
941 SYSTEMTIME st;
942 GetLocalTime(&st);
943 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
944 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
945 return buf;
946 }
947
948 bool os::getTimesSecs(double* process_real_time,
949 double* process_user_time,
950 double* process_system_time) {
951 HANDLE h_process = GetCurrentProcess();
952 FILETIME create_time, exit_time, kernel_time, user_time;
953 BOOL result = GetProcessTimes(h_process,
954 &create_time,
955 &exit_time,
956 &kernel_time,
957 &user_time);
958 if (result != 0) {
959 FILETIME wt;
960 GetSystemTimeAsFileTime(&wt);
961 jlong rtc_millis = windows_to_java_time(wt);
962 jlong user_millis = windows_to_java_time(user_time);
963 jlong system_millis = windows_to_java_time(kernel_time);
964 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
965 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
966 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
967 return true;
968 } else {
969 return false;
970 }
971 }
972
973 void os::shutdown() {
974 // allow PerfMemory to attempt cleanup of any persistent resources
975 perfMemory_exit();
976
977 // flush buffered output, finish log files
978 ostream_abort();
979
980 // Check for abort hook
981 abort_hook_t abort_hook = Arguments::abort_hook();
982 if (abort_hook != NULL) {
983 abort_hook();
984 }
985 }
986
987
988 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
989 PMINIDUMP_EXCEPTION_INFORMATION,
990 PMINIDUMP_USER_STREAM_INFORMATION,
991 PMINIDUMP_CALLBACK_INFORMATION);
992
993 static HANDLE dumpFile = NULL;
994
995 // Check if dump file can be created.
996 void os::check_dump_limit(char* buffer, size_t buffsz) {
997 bool status = true;
998 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
999 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1000 status = false;
1001 } else {
1002 const char* cwd = get_current_directory(NULL, 0);
1003 int pid = current_process_id();
1004 if (cwd != NULL) {
1005 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1006 } else {
1007 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1008 }
1009
1010 if (dumpFile == NULL &&
1011 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1012 == INVALID_HANDLE_VALUE) {
1013 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1014 status = false;
1015 }
1016 }
1017 VMError::record_coredump_status(buffer, status);
1018 }
1019
1020 void os::abort(bool dump_core, void* siginfo, void* context) {
1021 HINSTANCE dbghelp;
1022 EXCEPTION_POINTERS ep;
1023 MINIDUMP_EXCEPTION_INFORMATION mei;
1024 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1025
1026 HANDLE hProcess = GetCurrentProcess();
1027 DWORD processId = GetCurrentProcessId();
1028 MINIDUMP_TYPE dumpType;
1029
1030 shutdown();
1031 if (!dump_core || dumpFile == NULL) {
1032 if (dumpFile != NULL) {
1033 CloseHandle(dumpFile);
1034 }
1035 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1036 }
1037
1038 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1039
1040 if (dbghelp == NULL) {
1041 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1042 CloseHandle(dumpFile);
1043 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1044 }
1045
1046 _MiniDumpWriteDump =
1047 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1048 PMINIDUMP_EXCEPTION_INFORMATION,
1049 PMINIDUMP_USER_STREAM_INFORMATION,
1050 PMINIDUMP_CALLBACK_INFORMATION),
1051 GetProcAddress(dbghelp,
1052 "MiniDumpWriteDump"));
1053
1054 if (_MiniDumpWriteDump == NULL) {
1055 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1056 CloseHandle(dumpFile);
1057 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1058 }
1059
1060 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1061
1062 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1063 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1064 #if API_VERSION_NUMBER >= 11
1065 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1066 MiniDumpWithUnloadedModules);
1067 #endif
1068
1069 if (siginfo != NULL && context != NULL) {
1070 ep.ContextRecord = (PCONTEXT) context;
1071 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1072
1073 mei.ThreadId = GetCurrentThreadId();
1074 mei.ExceptionPointers = &ep;
1075 pmei = &mei;
1076 } else {
1077 pmei = NULL;
1078 }
1079
1080 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1081 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1082 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1083 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1084 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1085 }
1086 CloseHandle(dumpFile);
1087 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1088 }
1089
1090 void os::abort(bool dump_core) {
1091 abort(dump_core, NULL, NULL);
1092 }
1093
1094 // Die immediately, no exit hook, no abort hook, no cleanup.
1095 void os::die() {
1096 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1097 }
1098
1099 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1100 // * dirent_md.c 1.15 00/02/02
1101 //
1102 // The declarations for DIR and struct dirent are in jvm_win32.h.
1103
1104 // Caller must have already run dirname through JVM_NativePath, which removes
1105 // duplicate slashes and converts all instances of '/' into '\\'.
1106
1107 DIR * os::opendir(const char *dirname) {
1108 assert(dirname != NULL, "just checking"); // hotspot change
1109 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1110 DWORD fattr; // hotspot change
1111 char alt_dirname[4] = { 0, 0, 0, 0 };
1112
1113 if (dirp == 0) {
1114 errno = ENOMEM;
1115 return 0;
1116 }
1117
1118 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1119 // as a directory in FindFirstFile(). We detect this case here and
1120 // prepend the current drive name.
1121 //
1122 if (dirname[1] == '\0' && dirname[0] == '\\') {
1123 alt_dirname[0] = _getdrive() + 'A' - 1;
1124 alt_dirname[1] = ':';
1125 alt_dirname[2] = '\\';
1126 alt_dirname[3] = '\0';
1127 dirname = alt_dirname;
1128 }
1129
1130 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1131 if (dirp->path == 0) {
1132 free(dirp);
1133 errno = ENOMEM;
1134 return 0;
1135 }
1136 strcpy(dirp->path, dirname);
1137
1138 fattr = GetFileAttributes(dirp->path);
1139 if (fattr == 0xffffffff) {
1140 free(dirp->path);
1141 free(dirp);
1142 errno = ENOENT;
1143 return 0;
1144 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOTDIR;
1148 return 0;
1149 }
1150
1151 // Append "*.*", or possibly "\\*.*", to path
1152 if (dirp->path[1] == ':' &&
1153 (dirp->path[2] == '\0' ||
1154 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1155 // No '\\' needed for cases like "Z:" or "Z:\"
1156 strcat(dirp->path, "*.*");
1157 } else {
1158 strcat(dirp->path, "\\*.*");
1159 }
1160
1161 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1162 if (dirp->handle == INVALID_HANDLE_VALUE) {
1163 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1164 free(dirp->path);
1165 free(dirp);
1166 errno = EACCES;
1167 return 0;
1168 }
1169 }
1170 return dirp;
1171 }
1172
1173 // parameter dbuf unused on Windows
1174 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1175 assert(dirp != NULL, "just checking"); // hotspot change
1176 if (dirp->handle == INVALID_HANDLE_VALUE) {
1177 return 0;
1178 }
1179
1180 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1181
1182 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1183 if (GetLastError() == ERROR_INVALID_HANDLE) {
1184 errno = EBADF;
1185 return 0;
1186 }
1187 FindClose(dirp->handle);
1188 dirp->handle = INVALID_HANDLE_VALUE;
1189 }
1190
1191 return &dirp->dirent;
1192 }
1193
1194 int os::closedir(DIR *dirp) {
1195 assert(dirp != NULL, "just checking"); // hotspot change
1196 if (dirp->handle != INVALID_HANDLE_VALUE) {
1197 if (!FindClose(dirp->handle)) {
1198 errno = EBADF;
1199 return -1;
1200 }
1201 dirp->handle = INVALID_HANDLE_VALUE;
1202 }
1203 free(dirp->path);
1204 free(dirp);
1205 return 0;
1206 }
1207
1208 // This must be hard coded because it's the system's temporary
1209 // directory not the java application's temp directory, ala java.io.tmpdir.
1210 const char* os::get_temp_directory() {
1211 static char path_buf[MAX_PATH];
1212 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1213 return path_buf;
1214 } else {
1215 path_buf[0] = '\0';
1216 return path_buf;
1217 }
1218 }
1219
1220 static bool file_exists(const char* filename) {
1221 if (filename == NULL || strlen(filename) == 0) {
1222 return false;
1223 }
1224 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1225 }
1226
1227 bool os::dll_build_name(char *buffer, size_t buflen,
1228 const char* pname, const char* fname) {
1229 bool retval = false;
1230 const size_t pnamelen = pname ? strlen(pname) : 0;
1231 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1232
1233 // Return error on buffer overflow.
1234 if (pnamelen + strlen(fname) + 10 > buflen) {
1235 return retval;
1236 }
1237
1238 if (pnamelen == 0) {
1239 jio_snprintf(buffer, buflen, "%s.dll", fname);
1240 retval = true;
1241 } else if (c == ':' || c == '\\') {
1242 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1243 retval = true;
1244 } else if (strchr(pname, *os::path_separator()) != NULL) {
1245 int n;
1246 char** pelements = split_path(pname, &n);
1247 if (pelements == NULL) {
1248 return false;
1249 }
1250 for (int i = 0; i < n; i++) {
1251 char* path = pelements[i];
1252 // Really shouldn't be NULL, but check can't hurt
1253 size_t plen = (path == NULL) ? 0 : strlen(path);
1254 if (plen == 0) {
1255 continue; // skip the empty path values
1256 }
1257 const char lastchar = path[plen - 1];
1258 if (lastchar == ':' || lastchar == '\\') {
1259 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1260 } else {
1261 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1262 }
1263 if (file_exists(buffer)) {
1264 retval = true;
1265 break;
1266 }
1267 }
1268 // release the storage
1269 for (int i = 0; i < n; i++) {
1270 if (pelements[i] != NULL) {
1271 FREE_C_HEAP_ARRAY(char, pelements[i]);
1272 }
1273 }
1274 if (pelements != NULL) {
1275 FREE_C_HEAP_ARRAY(char*, pelements);
1276 }
1277 } else {
1278 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1279 retval = true;
1280 }
1281 return retval;
1282 }
1283
1284 // Needs to be in os specific directory because windows requires another
1285 // header file <direct.h>
1286 const char* os::get_current_directory(char *buf, size_t buflen) {
1287 int n = static_cast<int>(buflen);
1288 if (buflen > INT_MAX) n = INT_MAX;
1289 return _getcwd(buf, n);
1290 }
1291
1292 //-----------------------------------------------------------
1293 // Helper functions for fatal error handler
1294 #ifdef _WIN64
1295 // Helper routine which returns true if address in
1296 // within the NTDLL address space.
1297 //
1298 static bool _addr_in_ntdll(address addr) {
1299 HMODULE hmod;
1300 MODULEINFO minfo;
1301
1302 hmod = GetModuleHandle("NTDLL.DLL");
1303 if (hmod == NULL) return false;
1304 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1305 &minfo, sizeof(MODULEINFO))) {
1306 return false;
1307 }
1308
1309 if ((addr >= minfo.lpBaseOfDll) &&
1310 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1311 return true;
1312 } else {
1313 return false;
1314 }
1315 }
1316 #endif
1317
1318 struct _modinfo {
1319 address addr;
1320 char* full_path; // point to a char buffer
1321 int buflen; // size of the buffer
1322 address base_addr;
1323 };
1324
1325 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1326 address top_address, void * param) {
1327 struct _modinfo *pmod = (struct _modinfo *)param;
1328 if (!pmod) return -1;
1329
1330 if (base_addr <= pmod->addr &&
1331 top_address > pmod->addr) {
1332 // if a buffer is provided, copy path name to the buffer
1333 if (pmod->full_path) {
1334 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1335 }
1336 pmod->base_addr = base_addr;
1337 return 1;
1338 }
1339 return 0;
1340 }
1341
1342 bool os::dll_address_to_library_name(address addr, char* buf,
1343 int buflen, int* offset) {
1344 // buf is not optional, but offset is optional
1345 assert(buf != NULL, "sanity check");
1346
1347 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1348 // return the full path to the DLL file, sometimes it returns path
1349 // to the corresponding PDB file (debug info); sometimes it only
1350 // returns partial path, which makes life painful.
1351
1352 struct _modinfo mi;
1353 mi.addr = addr;
1354 mi.full_path = buf;
1355 mi.buflen = buflen;
1356 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1357 // buf already contains path name
1358 if (offset) *offset = addr - mi.base_addr;
1359 return true;
1360 }
1361
1362 buf[0] = '\0';
1363 if (offset) *offset = -1;
1364 return false;
1365 }
1366
1367 bool os::dll_address_to_function_name(address addr, char *buf,
1368 int buflen, int *offset) {
1369 // buf is not optional, but offset is optional
1370 assert(buf != NULL, "sanity check");
1371
1372 if (Decoder::decode(addr, buf, buflen, offset)) {
1373 return true;
1374 }
1375 if (offset != NULL) *offset = -1;
1376 buf[0] = '\0';
1377 return false;
1378 }
1379
1380 // save the start and end address of jvm.dll into param[0] and param[1]
1381 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1382 address top_address, void * param) {
1383 if (!param) return -1;
1384
1385 if (base_addr <= (address)_locate_jvm_dll &&
1386 top_address > (address)_locate_jvm_dll) {
1387 ((address*)param)[0] = base_addr;
1388 ((address*)param)[1] = top_address;
1389 return 1;
1390 }
1391 return 0;
1392 }
1393
1394 address vm_lib_location[2]; // start and end address of jvm.dll
1395
1396 // check if addr is inside jvm.dll
1397 bool os::address_is_in_vm(address addr) {
1398 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1399 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1400 assert(false, "Can't find jvm module.");
1401 return false;
1402 }
1403 }
1404
1405 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1406 }
1407
1408 // print module info; param is outputStream*
1409 static int _print_module(const char* fname, address base_address,
1410 address top_address, void* param) {
1411 if (!param) return -1;
1412
1413 outputStream* st = (outputStream*)param;
1414
1415 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1416 return 0;
1417 }
1418
1419 // Loads .dll/.so and
1420 // in case of error it checks if .dll/.so was built for the
1421 // same architecture as Hotspot is running on
1422 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1423 void * result = LoadLibrary(name);
1424 if (result != NULL) {
1425 return result;
1426 }
1427
1428 DWORD errcode = GetLastError();
1429 if (errcode == ERROR_MOD_NOT_FOUND) {
1430 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1431 ebuf[ebuflen - 1] = '\0';
1432 return NULL;
1433 }
1434
1435 // Parsing dll below
1436 // If we can read dll-info and find that dll was built
1437 // for an architecture other than Hotspot is running in
1438 // - then print to buffer "DLL was built for a different architecture"
1439 // else call os::lasterror to obtain system error message
1440
1441 // Read system error message into ebuf
1442 // It may or may not be overwritten below (in the for loop and just above)
1443 lasterror(ebuf, (size_t) ebuflen);
1444 ebuf[ebuflen - 1] = '\0';
1445 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1446 if (fd < 0) {
1447 return NULL;
1448 }
1449
1450 uint32_t signature_offset;
1451 uint16_t lib_arch = 0;
1452 bool failed_to_get_lib_arch =
1453 ( // Go to position 3c in the dll
1454 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1455 ||
1456 // Read location of signature
1457 (sizeof(signature_offset) !=
1458 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1459 ||
1460 // Go to COFF File Header in dll
1461 // that is located after "signature" (4 bytes long)
1462 (os::seek_to_file_offset(fd,
1463 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1464 ||
1465 // Read field that contains code of architecture
1466 // that dll was built for
1467 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1468 );
1469
1470 ::close(fd);
1471 if (failed_to_get_lib_arch) {
1472 // file i/o error - report os::lasterror(...) msg
1473 return NULL;
1474 }
1475
1476 typedef struct {
1477 uint16_t arch_code;
1478 char* arch_name;
1479 } arch_t;
1480
1481 static const arch_t arch_array[] = {
1482 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1483 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1484 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1485 };
1486 #if (defined _M_IA64)
1487 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1488 #elif (defined _M_AMD64)
1489 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1490 #elif (defined _M_IX86)
1491 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1492 #else
1493 #error Method os::dll_load requires that one of following \
1494 is defined :_M_IA64,_M_AMD64 or _M_IX86
1495 #endif
1496
1497
1498 // Obtain a string for printf operation
1499 // lib_arch_str shall contain string what platform this .dll was built for
1500 // running_arch_str shall string contain what platform Hotspot was built for
1501 char *running_arch_str = NULL, *lib_arch_str = NULL;
1502 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1503 if (lib_arch == arch_array[i].arch_code) {
1504 lib_arch_str = arch_array[i].arch_name;
1505 }
1506 if (running_arch == arch_array[i].arch_code) {
1507 running_arch_str = arch_array[i].arch_name;
1508 }
1509 }
1510
1511 assert(running_arch_str,
1512 "Didn't find running architecture code in arch_array");
1513
1514 // If the architecture is right
1515 // but some other error took place - report os::lasterror(...) msg
1516 if (lib_arch == running_arch) {
1517 return NULL;
1518 }
1519
1520 if (lib_arch_str != NULL) {
1521 ::_snprintf(ebuf, ebuflen - 1,
1522 "Can't load %s-bit .dll on a %s-bit platform",
1523 lib_arch_str, running_arch_str);
1524 } else {
1525 // don't know what architecture this dll was build for
1526 ::_snprintf(ebuf, ebuflen - 1,
1527 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1528 lib_arch, running_arch_str);
1529 }
1530
1531 return NULL;
1532 }
1533
1534 void os::print_dll_info(outputStream *st) {
1535 st->print_cr("Dynamic libraries:");
1536 get_loaded_modules_info(_print_module, (void *)st);
1537 }
1538
1539 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1540 HANDLE hProcess;
1541
1542 # define MAX_NUM_MODULES 128
1543 HMODULE modules[MAX_NUM_MODULES];
1544 static char filename[MAX_PATH];
1545 int result = 0;
1546
1547 if (!os::PSApiDll::PSApiAvailable()) {
1548 return 0;
1549 }
1550
1551 int pid = os::current_process_id();
1552 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1553 FALSE, pid);
1554 if (hProcess == NULL) return 0;
1555
1556 DWORD size_needed;
1557 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1558 sizeof(modules), &size_needed)) {
1559 CloseHandle(hProcess);
1560 return 0;
1561 }
1562
1563 // number of modules that are currently loaded
1564 int num_modules = size_needed / sizeof(HMODULE);
1565
1566 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1567 // Get Full pathname:
1568 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1569 filename, sizeof(filename))) {
1570 filename[0] = '\0';
1571 }
1572
1573 MODULEINFO modinfo;
1574 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1575 &modinfo, sizeof(modinfo))) {
1576 modinfo.lpBaseOfDll = NULL;
1577 modinfo.SizeOfImage = 0;
1578 }
1579
1580 // Invoke callback function
1581 result = callback(filename, (address)modinfo.lpBaseOfDll,
1582 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1583 if (result) break;
1584 }
1585
1586 CloseHandle(hProcess);
1587 return result;
1588 }
1589
1590 void os::print_os_info_brief(outputStream* st) {
1591 os::print_os_info(st);
1592 }
1593
1594 void os::print_os_info(outputStream* st) {
1595 #ifdef ASSERT
1596 char buffer[1024];
1597 DWORD size = sizeof(buffer);
1598 st->print(" HostName: ");
1599 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1600 st->print("%s", buffer);
1601 } else {
1602 st->print("N/A");
1603 }
1604 #endif
1605 st->print(" OS:");
1606 os::win32::print_windows_version(st);
1607 }
1608
1609 void os::win32::print_windows_version(outputStream* st) {
1610 OSVERSIONINFOEX osvi;
1611 VS_FIXEDFILEINFO *file_info;
1612 TCHAR kernel32_path[MAX_PATH];
1613 UINT len, ret;
1614
1615 // Use the GetVersionEx information to see if we're on a server or
1616 // workstation edition of Windows. Starting with Windows 8.1 we can't
1617 // trust the OS version information returned by this API.
1618 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1619 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1620 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1621 st->print_cr("Call to GetVersionEx failed");
1622 return;
1623 }
1624 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1625
1626 // Get the full path to \Windows\System32\kernel32.dll and use that for
1627 // determining what version of Windows we're running on.
1628 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1629 ret = GetSystemDirectory(kernel32_path, len);
1630 if (ret == 0 || ret > len) {
1631 st->print_cr("Call to GetSystemDirectory failed");
1632 return;
1633 }
1634 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1635
1636 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1637 if (version_size == 0) {
1638 st->print_cr("Call to GetFileVersionInfoSize failed");
1639 return;
1640 }
1641
1642 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1643 if (version_info == NULL) {
1644 st->print_cr("Failed to allocate version_info");
1645 return;
1646 }
1647
1648 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1649 os::free(version_info);
1650 st->print_cr("Call to GetFileVersionInfo failed");
1651 return;
1652 }
1653
1654 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1655 os::free(version_info);
1656 st->print_cr("Call to VerQueryValue failed");
1657 return;
1658 }
1659
1660 int major_version = HIWORD(file_info->dwProductVersionMS);
1661 int minor_version = LOWORD(file_info->dwProductVersionMS);
1662 int build_number = HIWORD(file_info->dwProductVersionLS);
1663 int build_minor = LOWORD(file_info->dwProductVersionLS);
1664 int os_vers = major_version * 1000 + minor_version;
1665 os::free(version_info);
1666
1667 st->print(" Windows ");
1668 switch (os_vers) {
1669
1670 case 6000:
1671 if (is_workstation) {
1672 st->print("Vista");
1673 } else {
1674 st->print("Server 2008");
1675 }
1676 break;
1677
1678 case 6001:
1679 if (is_workstation) {
1680 st->print("7");
1681 } else {
1682 st->print("Server 2008 R2");
1683 }
1684 break;
1685
1686 case 6002:
1687 if (is_workstation) {
1688 st->print("8");
1689 } else {
1690 st->print("Server 2012");
1691 }
1692 break;
1693
1694 case 6003:
1695 if (is_workstation) {
1696 st->print("8.1");
1697 } else {
1698 st->print("Server 2012 R2");
1699 }
1700 break;
1701
1702 case 10000:
1703 if (is_workstation) {
1704 st->print("10");
1705 } else {
1706 // The server version name of Windows 10 is not known at this time
1707 st->print("%d.%d", major_version, minor_version);
1708 }
1709 break;
1710
1711 default:
1712 // Unrecognized windows, print out its major and minor versions
1713 st->print("%d.%d", major_version, minor_version);
1714 break;
1715 }
1716
1717 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1718 // find out whether we are running on 64 bit processor or not
1719 SYSTEM_INFO si;
1720 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1721 os::Kernel32Dll::GetNativeSystemInfo(&si);
1722 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1723 st->print(" , 64 bit");
1724 }
1725
1726 st->print(" Build %d", build_number);
1727 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1728 st->cr();
1729 }
1730
1731 void os::pd_print_cpu_info(outputStream* st) {
1732 // Nothing to do for now.
1733 }
1734
1735 void os::print_memory_info(outputStream* st) {
1736 st->print("Memory:");
1737 st->print(" %dk page", os::vm_page_size()>>10);
1738
1739 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1740 // value if total memory is larger than 4GB
1741 MEMORYSTATUSEX ms;
1742 ms.dwLength = sizeof(ms);
1743 GlobalMemoryStatusEx(&ms);
1744
1745 st->print(", physical %uk", os::physical_memory() >> 10);
1746 st->print("(%uk free)", os::available_memory() >> 10);
1747
1748 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1749 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1750 st->cr();
1751 }
1752
1753 void os::print_siginfo(outputStream *st, void *siginfo) {
1754 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1755 st->print("siginfo:");
1756 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1757
1758 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1759 er->NumberParameters >= 2) {
1760 switch (er->ExceptionInformation[0]) {
1761 case 0: st->print(", reading address"); break;
1762 case 1: st->print(", writing address"); break;
1763 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1764 er->ExceptionInformation[0]);
1765 }
1766 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1767 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1768 er->NumberParameters >= 2 && UseSharedSpaces) {
1769 FileMapInfo* mapinfo = FileMapInfo::current_info();
1770 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1771 st->print("\n\nError accessing class data sharing archive." \
1772 " Mapped file inaccessible during execution, " \
1773 " possible disk/network problem.");
1774 }
1775 } else {
1776 int num = er->NumberParameters;
1777 if (num > 0) {
1778 st->print(", ExceptionInformation=");
1779 for (int i = 0; i < num; i++) {
1780 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1781 }
1782 }
1783 }
1784 st->cr();
1785 }
1786
1787 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1788 // do nothing
1789 }
1790
1791 static char saved_jvm_path[MAX_PATH] = {0};
1792
1793 // Find the full path to the current module, jvm.dll
1794 void os::jvm_path(char *buf, jint buflen) {
1795 // Error checking.
1796 if (buflen < MAX_PATH) {
1797 assert(false, "must use a large-enough buffer");
1798 buf[0] = '\0';
1799 return;
1800 }
1801 // Lazy resolve the path to current module.
1802 if (saved_jvm_path[0] != 0) {
1803 strcpy(buf, saved_jvm_path);
1804 return;
1805 }
1806
1807 buf[0] = '\0';
1808 if (Arguments::sun_java_launcher_is_altjvm()) {
1809 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1810 // for a JAVA_HOME environment variable and fix up the path so it
1811 // looks like jvm.dll is installed there (append a fake suffix
1812 // hotspot/jvm.dll).
1813 char* java_home_var = ::getenv("JAVA_HOME");
1814 if (java_home_var != NULL && java_home_var[0] != 0 &&
1815 strlen(java_home_var) < (size_t)buflen) {
1816 strncpy(buf, java_home_var, buflen);
1817
1818 // determine if this is a legacy image or modules image
1819 // modules image doesn't have "jre" subdirectory
1820 size_t len = strlen(buf);
1821 char* jrebin_p = buf + len;
1822 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1823 if (0 != _access(buf, 0)) {
1824 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1825 }
1826 len = strlen(buf);
1827 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1828 }
1829 }
1830
1831 if (buf[0] == '\0') {
1832 GetModuleFileName(vm_lib_handle, buf, buflen);
1833 }
1834 strncpy(saved_jvm_path, buf, MAX_PATH);
1835 saved_jvm_path[MAX_PATH - 1] = '\0';
1836 }
1837
1838
1839 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1840 #ifndef _WIN64
1841 st->print("_");
1842 #endif
1843 }
1844
1845
1846 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1847 #ifndef _WIN64
1848 st->print("@%d", args_size * sizeof(int));
1849 #endif
1850 }
1851
1852 // This method is a copy of JDK's sysGetLastErrorString
1853 // from src/windows/hpi/src/system_md.c
1854
1855 size_t os::lasterror(char* buf, size_t len) {
1856 DWORD errval;
1857
1858 if ((errval = GetLastError()) != 0) {
1859 // DOS error
1860 size_t n = (size_t)FormatMessage(
1861 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1862 NULL,
1863 errval,
1864 0,
1865 buf,
1866 (DWORD)len,
1867 NULL);
1868 if (n > 3) {
1869 // Drop final '.', CR, LF
1870 if (buf[n - 1] == '\n') n--;
1871 if (buf[n - 1] == '\r') n--;
1872 if (buf[n - 1] == '.') n--;
1873 buf[n] = '\0';
1874 }
1875 return n;
1876 }
1877
1878 if (errno != 0) {
1879 // C runtime error that has no corresponding DOS error code
1880 const char* s = strerror(errno);
1881 size_t n = strlen(s);
1882 if (n >= len) n = len - 1;
1883 strncpy(buf, s, n);
1884 buf[n] = '\0';
1885 return n;
1886 }
1887
1888 return 0;
1889 }
1890
1891 int os::get_last_error() {
1892 DWORD error = GetLastError();
1893 if (error == 0) {
1894 error = errno;
1895 }
1896 return (int)error;
1897 }
1898
1899 WindowsSemaphore::WindowsSemaphore(uint value) {
1900 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1901
1902 guarantee(_semaphore != NULL, err_msg("CreateSemaphore failed with error code: %lu", GetLastError()));
1903 }
1904
1905 WindowsSemaphore::~WindowsSemaphore() {
1906 ::CloseHandle(_semaphore);
1907 }
1908
1909 void WindowsSemaphore::signal(uint count) {
1910 if (count > 0) {
1911 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1912
1913 assert(ret != 0, err_msg("ReleaseSemaphore failed with error code: %lu", GetLastError()));
1914 }
1915 }
1916
1917 void WindowsSemaphore::wait() {
1918 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1919 assert(ret != WAIT_FAILED, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError()));
1920 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed with return value: %lu", ret));
1921 }
1922
1923 // sun.misc.Signal
1924 // NOTE that this is a workaround for an apparent kernel bug where if
1925 // a signal handler for SIGBREAK is installed then that signal handler
1926 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1927 // See bug 4416763.
1928 static void (*sigbreakHandler)(int) = NULL;
1929
1930 static void UserHandler(int sig, void *siginfo, void *context) {
1931 os::signal_notify(sig);
1932 // We need to reinstate the signal handler each time...
1933 os::signal(sig, (void*)UserHandler);
1934 }
1935
1936 void* os::user_handler() {
1937 return (void*) UserHandler;
1938 }
1939
1940 void* os::signal(int signal_number, void* handler) {
1941 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1942 void (*oldHandler)(int) = sigbreakHandler;
1943 sigbreakHandler = (void (*)(int)) handler;
1944 return (void*) oldHandler;
1945 } else {
1946 return (void*)::signal(signal_number, (void (*)(int))handler);
1947 }
1948 }
1949
1950 void os::signal_raise(int signal_number) {
1951 raise(signal_number);
1952 }
1953
1954 // The Win32 C runtime library maps all console control events other than ^C
1955 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1956 // logoff, and shutdown events. We therefore install our own console handler
1957 // that raises SIGTERM for the latter cases.
1958 //
1959 static BOOL WINAPI consoleHandler(DWORD event) {
1960 switch (event) {
1961 case CTRL_C_EVENT:
1962 if (is_error_reported()) {
1963 // Ctrl-C is pressed during error reporting, likely because the error
1964 // handler fails to abort. Let VM die immediately.
1965 os::die();
1966 }
1967
1968 os::signal_raise(SIGINT);
1969 return TRUE;
1970 break;
1971 case CTRL_BREAK_EVENT:
1972 if (sigbreakHandler != NULL) {
1973 (*sigbreakHandler)(SIGBREAK);
1974 }
1975 return TRUE;
1976 break;
1977 case CTRL_LOGOFF_EVENT: {
1978 // Don't terminate JVM if it is running in a non-interactive session,
1979 // such as a service process.
1980 USEROBJECTFLAGS flags;
1981 HANDLE handle = GetProcessWindowStation();
1982 if (handle != NULL &&
1983 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1984 sizeof(USEROBJECTFLAGS), NULL)) {
1985 // If it is a non-interactive session, let next handler to deal
1986 // with it.
1987 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1988 return FALSE;
1989 }
1990 }
1991 }
1992 case CTRL_CLOSE_EVENT:
1993 case CTRL_SHUTDOWN_EVENT:
1994 os::signal_raise(SIGTERM);
1995 return TRUE;
1996 break;
1997 default:
1998 break;
1999 }
2000 return FALSE;
2001 }
2002
2003 // The following code is moved from os.cpp for making this
2004 // code platform specific, which it is by its very nature.
2005
2006 // Return maximum OS signal used + 1 for internal use only
2007 // Used as exit signal for signal_thread
2008 int os::sigexitnum_pd() {
2009 return NSIG;
2010 }
2011
2012 // a counter for each possible signal value, including signal_thread exit signal
2013 static volatile jint pending_signals[NSIG+1] = { 0 };
2014 static HANDLE sig_sem = NULL;
2015
2016 void os::signal_init_pd() {
2017 // Initialize signal structures
2018 memset((void*)pending_signals, 0, sizeof(pending_signals));
2019
2020 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2021
2022 // Programs embedding the VM do not want it to attempt to receive
2023 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2024 // shutdown hooks mechanism introduced in 1.3. For example, when
2025 // the VM is run as part of a Windows NT service (i.e., a servlet
2026 // engine in a web server), the correct behavior is for any console
2027 // control handler to return FALSE, not TRUE, because the OS's
2028 // "final" handler for such events allows the process to continue if
2029 // it is a service (while terminating it if it is not a service).
2030 // To make this behavior uniform and the mechanism simpler, we
2031 // completely disable the VM's usage of these console events if -Xrs
2032 // (=ReduceSignalUsage) is specified. This means, for example, that
2033 // the CTRL-BREAK thread dump mechanism is also disabled in this
2034 // case. See bugs 4323062, 4345157, and related bugs.
2035
2036 if (!ReduceSignalUsage) {
2037 // Add a CTRL-C handler
2038 SetConsoleCtrlHandler(consoleHandler, TRUE);
2039 }
2040 }
2041
2042 void os::signal_notify(int signal_number) {
2043 BOOL ret;
2044 if (sig_sem != NULL) {
2045 Atomic::inc(&pending_signals[signal_number]);
2046 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2047 assert(ret != 0, "ReleaseSemaphore() failed");
2048 }
2049 }
2050
2051 static int check_pending_signals(bool wait_for_signal) {
2052 DWORD ret;
2053 while (true) {
2054 for (int i = 0; i < NSIG + 1; i++) {
2055 jint n = pending_signals[i];
2056 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2057 return i;
2058 }
2059 }
2060 if (!wait_for_signal) {
2061 return -1;
2062 }
2063
2064 JavaThread *thread = JavaThread::current();
2065
2066 ThreadBlockInVM tbivm(thread);
2067
2068 bool threadIsSuspended;
2069 do {
2070 thread->set_suspend_equivalent();
2071 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2072 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2073 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2074
2075 // were we externally suspended while we were waiting?
2076 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2077 if (threadIsSuspended) {
2078 // The semaphore has been incremented, but while we were waiting
2079 // another thread suspended us. We don't want to continue running
2080 // while suspended because that would surprise the thread that
2081 // suspended us.
2082 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2083 assert(ret != 0, "ReleaseSemaphore() failed");
2084
2085 thread->java_suspend_self();
2086 }
2087 } while (threadIsSuspended);
2088 }
2089 }
2090
2091 int os::signal_lookup() {
2092 return check_pending_signals(false);
2093 }
2094
2095 int os::signal_wait() {
2096 return check_pending_signals(true);
2097 }
2098
2099 // Implicit OS exception handling
2100
2101 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2102 address handler) {
2103 JavaThread* thread = JavaThread::current();
2104 // Save pc in thread
2105 #ifdef _M_IA64
2106 // Do not blow up if no thread info available.
2107 if (thread) {
2108 // Saving PRECISE pc (with slot information) in thread.
2109 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2110 // Convert precise PC into "Unix" format
2111 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2112 thread->set_saved_exception_pc((address)precise_pc);
2113 }
2114 // Set pc to handler
2115 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2116 // Clear out psr.ri (= Restart Instruction) in order to continue
2117 // at the beginning of the target bundle.
2118 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2119 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2120 #else
2121 #ifdef _M_AMD64
2122 // Do not blow up if no thread info available.
2123 if (thread) {
2124 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2125 }
2126 // Set pc to handler
2127 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2128 #else
2129 // Do not blow up if no thread info available.
2130 if (thread) {
2131 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2132 }
2133 // Set pc to handler
2134 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2135 #endif
2136 #endif
2137
2138 // Continue the execution
2139 return EXCEPTION_CONTINUE_EXECUTION;
2140 }
2141
2142
2143 // Used for PostMortemDump
2144 extern "C" void safepoints();
2145 extern "C" void find(int x);
2146 extern "C" void events();
2147
2148 // According to Windows API documentation, an illegal instruction sequence should generate
2149 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2150 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2151 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2152
2153 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2154
2155 // From "Execution Protection in the Windows Operating System" draft 0.35
2156 // Once a system header becomes available, the "real" define should be
2157 // included or copied here.
2158 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2159
2160 // Handle NAT Bit consumption on IA64.
2161 #ifdef _M_IA64
2162 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2163 #endif
2164
2165 // Windows Vista/2008 heap corruption check
2166 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2167
2168 #define def_excpt(val) #val, val
2169
2170 struct siglabel {
2171 char *name;
2172 int number;
2173 };
2174
2175 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2176 // C++ compiler contain this error code. Because this is a compiler-generated
2177 // error, the code is not listed in the Win32 API header files.
2178 // The code is actually a cryptic mnemonic device, with the initial "E"
2179 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2180 // ASCII values of "msc".
2181
2182 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2183
2184
2185 struct siglabel exceptlabels[] = {
2186 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2187 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2188 def_excpt(EXCEPTION_BREAKPOINT),
2189 def_excpt(EXCEPTION_SINGLE_STEP),
2190 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2191 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2192 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2193 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2194 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2195 def_excpt(EXCEPTION_FLT_OVERFLOW),
2196 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2197 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2198 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2199 def_excpt(EXCEPTION_INT_OVERFLOW),
2200 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2201 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2202 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2203 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2204 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2205 def_excpt(EXCEPTION_STACK_OVERFLOW),
2206 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2207 def_excpt(EXCEPTION_GUARD_PAGE),
2208 def_excpt(EXCEPTION_INVALID_HANDLE),
2209 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2210 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2211 #ifdef _M_IA64
2212 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2213 #endif
2214 NULL, 0
2215 };
2216
2217 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2218 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2219 if (exceptlabels[i].number == exception_code) {
2220 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2221 return buf;
2222 }
2223 }
2224
2225 return NULL;
2226 }
2227
2228 //-----------------------------------------------------------------------------
2229 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2230 // handle exception caused by idiv; should only happen for -MinInt/-1
2231 // (division by zero is handled explicitly)
2232 #ifdef _M_IA64
2233 assert(0, "Fix Handle_IDiv_Exception");
2234 #else
2235 #ifdef _M_AMD64
2236 PCONTEXT ctx = exceptionInfo->ContextRecord;
2237 address pc = (address)ctx->Rip;
2238 assert(pc[0] == 0xF7, "not an idiv opcode");
2239 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2240 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2241 // set correct result values and continue after idiv instruction
2242 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2243 ctx->Rax = (DWORD)min_jint; // result
2244 ctx->Rdx = (DWORD)0; // remainder
2245 // Continue the execution
2246 #else
2247 PCONTEXT ctx = exceptionInfo->ContextRecord;
2248 address pc = (address)ctx->Eip;
2249 assert(pc[0] == 0xF7, "not an idiv opcode");
2250 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2251 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2252 // set correct result values and continue after idiv instruction
2253 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2254 ctx->Eax = (DWORD)min_jint; // result
2255 ctx->Edx = (DWORD)0; // remainder
2256 // Continue the execution
2257 #endif
2258 #endif
2259 return EXCEPTION_CONTINUE_EXECUTION;
2260 }
2261
2262 //-----------------------------------------------------------------------------
2263 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2264 PCONTEXT ctx = exceptionInfo->ContextRecord;
2265 #ifndef _WIN64
2266 // handle exception caused by native method modifying control word
2267 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2268
2269 switch (exception_code) {
2270 case EXCEPTION_FLT_DENORMAL_OPERAND:
2271 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2272 case EXCEPTION_FLT_INEXACT_RESULT:
2273 case EXCEPTION_FLT_INVALID_OPERATION:
2274 case EXCEPTION_FLT_OVERFLOW:
2275 case EXCEPTION_FLT_STACK_CHECK:
2276 case EXCEPTION_FLT_UNDERFLOW:
2277 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2278 if (fp_control_word != ctx->FloatSave.ControlWord) {
2279 // Restore FPCW and mask out FLT exceptions
2280 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2281 // Mask out pending FLT exceptions
2282 ctx->FloatSave.StatusWord &= 0xffffff00;
2283 return EXCEPTION_CONTINUE_EXECUTION;
2284 }
2285 }
2286
2287 if (prev_uef_handler != NULL) {
2288 // We didn't handle this exception so pass it to the previous
2289 // UnhandledExceptionFilter.
2290 return (prev_uef_handler)(exceptionInfo);
2291 }
2292 #else // !_WIN64
2293 // On Windows, the mxcsr control bits are non-volatile across calls
2294 // See also CR 6192333
2295 //
2296 jint MxCsr = INITIAL_MXCSR;
2297 // we can't use StubRoutines::addr_mxcsr_std()
2298 // because in Win64 mxcsr is not saved there
2299 if (MxCsr != ctx->MxCsr) {
2300 ctx->MxCsr = MxCsr;
2301 return EXCEPTION_CONTINUE_EXECUTION;
2302 }
2303 #endif // !_WIN64
2304
2305 return EXCEPTION_CONTINUE_SEARCH;
2306 }
2307
2308 static inline void report_error(Thread* t, DWORD exception_code,
2309 address addr, void* siginfo, void* context) {
2310 VMError err(t, exception_code, addr, siginfo, context);
2311 err.report_and_die();
2312
2313 // If UseOsErrorReporting, this will return here and save the error file
2314 // somewhere where we can find it in the minidump.
2315 }
2316
2317 //-----------------------------------------------------------------------------
2318 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2319 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2320 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2321 #ifdef _M_IA64
2322 // On Itanium, we need the "precise pc", which has the slot number coded
2323 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2324 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2325 // Convert the pc to "Unix format", which has the slot number coded
2326 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2327 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2328 // information is saved in the Unix format.
2329 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2330 #else
2331 #ifdef _M_AMD64
2332 address pc = (address) exceptionInfo->ContextRecord->Rip;
2333 #else
2334 address pc = (address) exceptionInfo->ContextRecord->Eip;
2335 #endif
2336 #endif
2337 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2338
2339 // Handle SafeFetch32 and SafeFetchN exceptions.
2340 if (StubRoutines::is_safefetch_fault(pc)) {
2341 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2342 }
2343
2344 #ifndef _WIN64
2345 // Execution protection violation - win32 running on AMD64 only
2346 // Handled first to avoid misdiagnosis as a "normal" access violation;
2347 // This is safe to do because we have a new/unique ExceptionInformation
2348 // code for this condition.
2349 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2350 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2351 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2352 address addr = (address) exceptionRecord->ExceptionInformation[1];
2353
2354 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2355 int page_size = os::vm_page_size();
2356
2357 // Make sure the pc and the faulting address are sane.
2358 //
2359 // If an instruction spans a page boundary, and the page containing
2360 // the beginning of the instruction is executable but the following
2361 // page is not, the pc and the faulting address might be slightly
2362 // different - we still want to unguard the 2nd page in this case.
2363 //
2364 // 15 bytes seems to be a (very) safe value for max instruction size.
2365 bool pc_is_near_addr =
2366 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2367 bool instr_spans_page_boundary =
2368 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2369 (intptr_t) page_size) > 0);
2370
2371 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2372 static volatile address last_addr =
2373 (address) os::non_memory_address_word();
2374
2375 // In conservative mode, don't unguard unless the address is in the VM
2376 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2377 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2378
2379 // Set memory to RWX and retry
2380 address page_start =
2381 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2382 bool res = os::protect_memory((char*) page_start, page_size,
2383 os::MEM_PROT_RWX);
2384
2385 if (PrintMiscellaneous && Verbose) {
2386 char buf[256];
2387 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2388 "at " INTPTR_FORMAT
2389 ", unguarding " INTPTR_FORMAT ": %s", addr,
2390 page_start, (res ? "success" : strerror(errno)));
2391 tty->print_raw_cr(buf);
2392 }
2393
2394 // Set last_addr so if we fault again at the same address, we don't
2395 // end up in an endless loop.
2396 //
2397 // There are two potential complications here. Two threads trapping
2398 // at the same address at the same time could cause one of the
2399 // threads to think it already unguarded, and abort the VM. Likely
2400 // very rare.
2401 //
2402 // The other race involves two threads alternately trapping at
2403 // different addresses and failing to unguard the page, resulting in
2404 // an endless loop. This condition is probably even more unlikely
2405 // than the first.
2406 //
2407 // Although both cases could be avoided by using locks or thread
2408 // local last_addr, these solutions are unnecessary complication:
2409 // this handler is a best-effort safety net, not a complete solution.
2410 // It is disabled by default and should only be used as a workaround
2411 // in case we missed any no-execute-unsafe VM code.
2412
2413 last_addr = addr;
2414
2415 return EXCEPTION_CONTINUE_EXECUTION;
2416 }
2417 }
2418
2419 // Last unguard failed or not unguarding
2420 tty->print_raw_cr("Execution protection violation");
2421 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2422 exceptionInfo->ContextRecord);
2423 return EXCEPTION_CONTINUE_SEARCH;
2424 }
2425 }
2426 #endif // _WIN64
2427
2428 // Check to see if we caught the safepoint code in the
2429 // process of write protecting the memory serialization page.
2430 // It write enables the page immediately after protecting it
2431 // so just return.
2432 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2433 JavaThread* thread = (JavaThread*) t;
2434 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2435 address addr = (address) exceptionRecord->ExceptionInformation[1];
2436 if (os::is_memory_serialize_page(thread, addr)) {
2437 // Block current thread until the memory serialize page permission restored.
2438 os::block_on_serialize_page_trap();
2439 return EXCEPTION_CONTINUE_EXECUTION;
2440 }
2441 }
2442
2443 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2444 VM_Version::is_cpuinfo_segv_addr(pc)) {
2445 // Verify that OS save/restore AVX registers.
2446 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2447 }
2448
2449 if (t != NULL && t->is_Java_thread()) {
2450 JavaThread* thread = (JavaThread*) t;
2451 bool in_java = thread->thread_state() == _thread_in_Java;
2452
2453 // Handle potential stack overflows up front.
2454 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2455 if (os::uses_stack_guard_pages()) {
2456 #ifdef _M_IA64
2457 // Use guard page for register stack.
2458 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2459 address addr = (address) exceptionRecord->ExceptionInformation[1];
2460 // Check for a register stack overflow on Itanium
2461 if (thread->addr_inside_register_stack_red_zone(addr)) {
2462 // Fatal red zone violation happens if the Java program
2463 // catches a StackOverflow error and does so much processing
2464 // that it runs beyond the unprotected yellow guard zone. As
2465 // a result, we are out of here.
2466 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2467 } else if(thread->addr_inside_register_stack(addr)) {
2468 // Disable the yellow zone which sets the state that
2469 // we've got a stack overflow problem.
2470 if (thread->stack_yellow_zone_enabled()) {
2471 thread->disable_stack_yellow_zone();
2472 }
2473 // Give us some room to process the exception.
2474 thread->disable_register_stack_guard();
2475 // Tracing with +Verbose.
2476 if (Verbose) {
2477 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2478 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2479 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2480 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2481 thread->register_stack_base(),
2482 thread->register_stack_base() + thread->stack_size());
2483 }
2484
2485 // Reguard the permanent register stack red zone just to be sure.
2486 // We saw Windows silently disabling this without telling us.
2487 thread->enable_register_stack_red_zone();
2488
2489 return Handle_Exception(exceptionInfo,
2490 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2491 }
2492 #endif
2493 if (thread->stack_yellow_zone_enabled()) {
2494 // Yellow zone violation. The o/s has unprotected the first yellow
2495 // zone page for us. Note: must call disable_stack_yellow_zone to
2496 // update the enabled status, even if the zone contains only one page.
2497 thread->disable_stack_yellow_zone();
2498 // If not in java code, return and hope for the best.
2499 return in_java
2500 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2501 : EXCEPTION_CONTINUE_EXECUTION;
2502 } else {
2503 // Fatal red zone violation.
2504 thread->disable_stack_red_zone();
2505 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2506 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2507 exceptionInfo->ContextRecord);
2508 return EXCEPTION_CONTINUE_SEARCH;
2509 }
2510 } else if (in_java) {
2511 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2512 // a one-time-only guard page, which it has released to us. The next
2513 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2514 return Handle_Exception(exceptionInfo,
2515 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2516 } else {
2517 // Can only return and hope for the best. Further stack growth will
2518 // result in an ACCESS_VIOLATION.
2519 return EXCEPTION_CONTINUE_EXECUTION;
2520 }
2521 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2522 // Either stack overflow or null pointer exception.
2523 if (in_java) {
2524 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2525 address addr = (address) exceptionRecord->ExceptionInformation[1];
2526 address stack_end = thread->stack_base() - thread->stack_size();
2527 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2528 // Stack overflow.
2529 assert(!os::uses_stack_guard_pages(),
2530 "should be caught by red zone code above.");
2531 return Handle_Exception(exceptionInfo,
2532 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2533 }
2534 // Check for safepoint polling and implicit null
2535 // We only expect null pointers in the stubs (vtable)
2536 // the rest are checked explicitly now.
2537 CodeBlob* cb = CodeCache::find_blob(pc);
2538 if (cb != NULL) {
2539 if (os::is_poll_address(addr)) {
2540 address stub = SharedRuntime::get_poll_stub(pc);
2541 return Handle_Exception(exceptionInfo, stub);
2542 }
2543 }
2544 {
2545 #ifdef _WIN64
2546 // If it's a legal stack address map the entire region in
2547 //
2548 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2549 address addr = (address) exceptionRecord->ExceptionInformation[1];
2550 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2551 addr = (address)((uintptr_t)addr &
2552 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2553 os::commit_memory((char *)addr, thread->stack_base() - addr,
2554 !ExecMem);
2555 return EXCEPTION_CONTINUE_EXECUTION;
2556 } else
2557 #endif
2558 {
2559 // Null pointer exception.
2560 #ifdef _M_IA64
2561 // Process implicit null checks in compiled code. Note: Implicit null checks
2562 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2563 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2564 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2565 // Handle implicit null check in UEP method entry
2566 if (cb && (cb->is_frame_complete_at(pc) ||
2567 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2568 if (Verbose) {
2569 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2570 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2571 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2572 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2573 *(bundle_start + 1), *bundle_start);
2574 }
2575 return Handle_Exception(exceptionInfo,
2576 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2577 }
2578 }
2579
2580 // Implicit null checks were processed above. Hence, we should not reach
2581 // here in the usual case => die!
2582 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2583 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2584 exceptionInfo->ContextRecord);
2585 return EXCEPTION_CONTINUE_SEARCH;
2586
2587 #else // !IA64
2588
2589 // Windows 98 reports faulting addresses incorrectly
2590 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2591 !os::win32::is_nt()) {
2592 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2593 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2594 }
2595 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2596 exceptionInfo->ContextRecord);
2597 return EXCEPTION_CONTINUE_SEARCH;
2598 #endif
2599 }
2600 }
2601 }
2602
2603 #ifdef _WIN64
2604 // Special care for fast JNI field accessors.
2605 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2606 // in and the heap gets shrunk before the field access.
2607 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2608 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2609 if (addr != (address)-1) {
2610 return Handle_Exception(exceptionInfo, addr);
2611 }
2612 }
2613 #endif
2614
2615 // Stack overflow or null pointer exception in native code.
2616 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2617 exceptionInfo->ContextRecord);
2618 return EXCEPTION_CONTINUE_SEARCH;
2619 } // /EXCEPTION_ACCESS_VIOLATION
2620 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2621 #if defined _M_IA64
2622 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2623 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2624 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2625
2626 // Compiled method patched to be non entrant? Following conditions must apply:
2627 // 1. must be first instruction in bundle
2628 // 2. must be a break instruction with appropriate code
2629 if ((((uint64_t) pc & 0x0F) == 0) &&
2630 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2631 return Handle_Exception(exceptionInfo,
2632 (address)SharedRuntime::get_handle_wrong_method_stub());
2633 }
2634 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2635 #endif
2636
2637
2638 if (in_java) {
2639 switch (exception_code) {
2640 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2641 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2642
2643 case EXCEPTION_INT_OVERFLOW:
2644 return Handle_IDiv_Exception(exceptionInfo);
2645
2646 } // switch
2647 }
2648 if (((thread->thread_state() == _thread_in_Java) ||
2649 (thread->thread_state() == _thread_in_native)) &&
2650 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2651 LONG result=Handle_FLT_Exception(exceptionInfo);
2652 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2653 }
2654 }
2655
2656 if (exception_code != EXCEPTION_BREAKPOINT) {
2657 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2658 exceptionInfo->ContextRecord);
2659 }
2660 return EXCEPTION_CONTINUE_SEARCH;
2661 }
2662
2663 #ifndef _WIN64
2664 // Special care for fast JNI accessors.
2665 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2666 // the heap gets shrunk before the field access.
2667 // Need to install our own structured exception handler since native code may
2668 // install its own.
2669 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2670 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2671 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2672 address pc = (address) exceptionInfo->ContextRecord->Eip;
2673 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2674 if (addr != (address)-1) {
2675 return Handle_Exception(exceptionInfo, addr);
2676 }
2677 }
2678 return EXCEPTION_CONTINUE_SEARCH;
2679 }
2680
2681 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2682 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2683 jobject obj, \
2684 jfieldID fieldID) { \
2685 __try { \
2686 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2687 obj, \
2688 fieldID); \
2689 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2690 _exception_info())) { \
2691 } \
2692 return 0; \
2693 }
2694
2695 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2696 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2697 DEFINE_FAST_GETFIELD(jchar, char, Char)
2698 DEFINE_FAST_GETFIELD(jshort, short, Short)
2699 DEFINE_FAST_GETFIELD(jint, int, Int)
2700 DEFINE_FAST_GETFIELD(jlong, long, Long)
2701 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2702 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2703
2704 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2705 switch (type) {
2706 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2707 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2708 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2709 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2710 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2711 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2712 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2713 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2714 default: ShouldNotReachHere();
2715 }
2716 return (address)-1;
2717 }
2718 #endif
2719
2720 // Virtual Memory
2721
2722 int os::vm_page_size() { return os::win32::vm_page_size(); }
2723 int os::vm_allocation_granularity() {
2724 return os::win32::vm_allocation_granularity();
2725 }
2726
2727 // Windows large page support is available on Windows 2003. In order to use
2728 // large page memory, the administrator must first assign additional privilege
2729 // to the user:
2730 // + select Control Panel -> Administrative Tools -> Local Security Policy
2731 // + select Local Policies -> User Rights Assignment
2732 // + double click "Lock pages in memory", add users and/or groups
2733 // + reboot
2734 // Note the above steps are needed for administrator as well, as administrators
2735 // by default do not have the privilege to lock pages in memory.
2736 //
2737 // Note about Windows 2003: although the API supports committing large page
2738 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2739 // scenario, I found through experiment it only uses large page if the entire
2740 // memory region is reserved and committed in a single VirtualAlloc() call.
2741 // This makes Windows large page support more or less like Solaris ISM, in
2742 // that the entire heap must be committed upfront. This probably will change
2743 // in the future, if so the code below needs to be revisited.
2744
2745 #ifndef MEM_LARGE_PAGES
2746 #define MEM_LARGE_PAGES 0x20000000
2747 #endif
2748
2749 static HANDLE _hProcess;
2750 static HANDLE _hToken;
2751
2752 // Container for NUMA node list info
2753 class NUMANodeListHolder {
2754 private:
2755 int *_numa_used_node_list; // allocated below
2756 int _numa_used_node_count;
2757
2758 void free_node_list() {
2759 if (_numa_used_node_list != NULL) {
2760 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2761 }
2762 }
2763
2764 public:
2765 NUMANodeListHolder() {
2766 _numa_used_node_count = 0;
2767 _numa_used_node_list = NULL;
2768 // do rest of initialization in build routine (after function pointers are set up)
2769 }
2770
2771 ~NUMANodeListHolder() {
2772 free_node_list();
2773 }
2774
2775 bool build() {
2776 DWORD_PTR proc_aff_mask;
2777 DWORD_PTR sys_aff_mask;
2778 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2779 ULONG highest_node_number;
2780 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2781 free_node_list();
2782 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2783 for (unsigned int i = 0; i <= highest_node_number; i++) {
2784 ULONGLONG proc_mask_numa_node;
2785 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2786 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2787 _numa_used_node_list[_numa_used_node_count++] = i;
2788 }
2789 }
2790 return (_numa_used_node_count > 1);
2791 }
2792
2793 int get_count() { return _numa_used_node_count; }
2794 int get_node_list_entry(int n) {
2795 // for indexes out of range, returns -1
2796 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2797 }
2798
2799 } numa_node_list_holder;
2800
2801
2802
2803 static size_t _large_page_size = 0;
2804
2805 static bool resolve_functions_for_large_page_init() {
2806 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2807 os::Advapi32Dll::AdvapiAvailable();
2808 }
2809
2810 static bool request_lock_memory_privilege() {
2811 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2812 os::current_process_id());
2813
2814 LUID luid;
2815 if (_hProcess != NULL &&
2816 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2817 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2818
2819 TOKEN_PRIVILEGES tp;
2820 tp.PrivilegeCount = 1;
2821 tp.Privileges[0].Luid = luid;
2822 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2823
2824 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2825 // privilege. Check GetLastError() too. See MSDN document.
2826 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2827 (GetLastError() == ERROR_SUCCESS)) {
2828 return true;
2829 }
2830 }
2831
2832 return false;
2833 }
2834
2835 static void cleanup_after_large_page_init() {
2836 if (_hProcess) CloseHandle(_hProcess);
2837 _hProcess = NULL;
2838 if (_hToken) CloseHandle(_hToken);
2839 _hToken = NULL;
2840 }
2841
2842 static bool numa_interleaving_init() {
2843 bool success = false;
2844 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2845
2846 // print a warning if UseNUMAInterleaving flag is specified on command line
2847 bool warn_on_failure = use_numa_interleaving_specified;
2848 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2849
2850 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2851 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2852 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2853
2854 if (os::Kernel32Dll::NumaCallsAvailable()) {
2855 if (numa_node_list_holder.build()) {
2856 if (PrintMiscellaneous && Verbose) {
2857 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2858 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2859 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2860 }
2861 tty->print("\n");
2862 }
2863 success = true;
2864 } else {
2865 WARN("Process does not cover multiple NUMA nodes.");
2866 }
2867 } else {
2868 WARN("NUMA Interleaving is not supported by the operating system.");
2869 }
2870 if (!success) {
2871 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2872 }
2873 return success;
2874 #undef WARN
2875 }
2876
2877 // this routine is used whenever we need to reserve a contiguous VA range
2878 // but we need to make separate VirtualAlloc calls for each piece of the range
2879 // Reasons for doing this:
2880 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2881 // * UseNUMAInterleaving requires a separate node for each piece
2882 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2883 DWORD prot,
2884 bool should_inject_error = false) {
2885 char * p_buf;
2886 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2887 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2888 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2889
2890 // first reserve enough address space in advance since we want to be
2891 // able to break a single contiguous virtual address range into multiple
2892 // large page commits but WS2003 does not allow reserving large page space
2893 // so we just use 4K pages for reserve, this gives us a legal contiguous
2894 // address space. then we will deallocate that reservation, and re alloc
2895 // using large pages
2896 const size_t size_of_reserve = bytes + chunk_size;
2897 if (bytes > size_of_reserve) {
2898 // Overflowed.
2899 return NULL;
2900 }
2901 p_buf = (char *) VirtualAlloc(addr,
2902 size_of_reserve, // size of Reserve
2903 MEM_RESERVE,
2904 PAGE_READWRITE);
2905 // If reservation failed, return NULL
2906 if (p_buf == NULL) return NULL;
2907 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2908 os::release_memory(p_buf, bytes + chunk_size);
2909
2910 // we still need to round up to a page boundary (in case we are using large pages)
2911 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2912 // instead we handle this in the bytes_to_rq computation below
2913 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2914
2915 // now go through and allocate one chunk at a time until all bytes are
2916 // allocated
2917 size_t bytes_remaining = bytes;
2918 // An overflow of align_size_up() would have been caught above
2919 // in the calculation of size_of_reserve.
2920 char * next_alloc_addr = p_buf;
2921 HANDLE hProc = GetCurrentProcess();
2922
2923 #ifdef ASSERT
2924 // Variable for the failure injection
2925 long ran_num = os::random();
2926 size_t fail_after = ran_num % bytes;
2927 #endif
2928
2929 int count=0;
2930 while (bytes_remaining) {
2931 // select bytes_to_rq to get to the next chunk_size boundary
2932
2933 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2934 // Note allocate and commit
2935 char * p_new;
2936
2937 #ifdef ASSERT
2938 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2939 #else
2940 const bool inject_error_now = false;
2941 #endif
2942
2943 if (inject_error_now) {
2944 p_new = NULL;
2945 } else {
2946 if (!UseNUMAInterleaving) {
2947 p_new = (char *) VirtualAlloc(next_alloc_addr,
2948 bytes_to_rq,
2949 flags,
2950 prot);
2951 } else {
2952 // get the next node to use from the used_node_list
2953 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2954 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2955 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2956 next_alloc_addr,
2957 bytes_to_rq,
2958 flags,
2959 prot,
2960 node);
2961 }
2962 }
2963
2964 if (p_new == NULL) {
2965 // Free any allocated pages
2966 if (next_alloc_addr > p_buf) {
2967 // Some memory was committed so release it.
2968 size_t bytes_to_release = bytes - bytes_remaining;
2969 // NMT has yet to record any individual blocks, so it
2970 // need to create a dummy 'reserve' record to match
2971 // the release.
2972 MemTracker::record_virtual_memory_reserve((address)p_buf,
2973 bytes_to_release, CALLER_PC);
2974 os::release_memory(p_buf, bytes_to_release);
2975 }
2976 #ifdef ASSERT
2977 if (should_inject_error) {
2978 if (TracePageSizes && Verbose) {
2979 tty->print_cr("Reserving pages individually failed.");
2980 }
2981 }
2982 #endif
2983 return NULL;
2984 }
2985
2986 bytes_remaining -= bytes_to_rq;
2987 next_alloc_addr += bytes_to_rq;
2988 count++;
2989 }
2990 // Although the memory is allocated individually, it is returned as one.
2991 // NMT records it as one block.
2992 if ((flags & MEM_COMMIT) != 0) {
2993 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2994 } else {
2995 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2996 }
2997
2998 // made it this far, success
2999 return p_buf;
3000 }
3001
3002
3003
3004 void os::large_page_init() {
3005 if (!UseLargePages) return;
3006
3007 // print a warning if any large page related flag is specified on command line
3008 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3009 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3010 bool success = false;
3011
3012 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3013 if (resolve_functions_for_large_page_init()) {
3014 if (request_lock_memory_privilege()) {
3015 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3016 if (s) {
3017 #if defined(IA32) || defined(AMD64)
3018 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3019 WARN("JVM cannot use large pages bigger than 4mb.");
3020 } else {
3021 #endif
3022 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3023 _large_page_size = LargePageSizeInBytes;
3024 } else {
3025 _large_page_size = s;
3026 }
3027 success = true;
3028 #if defined(IA32) || defined(AMD64)
3029 }
3030 #endif
3031 } else {
3032 WARN("Large page is not supported by the processor.");
3033 }
3034 } else {
3035 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3036 }
3037 } else {
3038 WARN("Large page is not supported by the operating system.");
3039 }
3040 #undef WARN
3041
3042 const size_t default_page_size = (size_t) vm_page_size();
3043 if (success && _large_page_size > default_page_size) {
3044 _page_sizes[0] = _large_page_size;
3045 _page_sizes[1] = default_page_size;
3046 _page_sizes[2] = 0;
3047 }
3048
3049 cleanup_after_large_page_init();
3050 UseLargePages = success;
3051 }
3052
3053 // On win32, one cannot release just a part of reserved memory, it's an
3054 // all or nothing deal. When we split a reservation, we must break the
3055 // reservation into two reservations.
3056 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3057 bool realloc) {
3058 if (size > 0) {
3059 release_memory(base, size);
3060 if (realloc) {
3061 reserve_memory(split, base);
3062 }
3063 if (size != split) {
3064 reserve_memory(size - split, base + split);
3065 }
3066 }
3067 }
3068
3069 // Multiple threads can race in this code but it's not possible to unmap small sections of
3070 // virtual space to get requested alignment, like posix-like os's.
3071 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3072 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3073 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3074 "Alignment must be a multiple of allocation granularity (page size)");
3075 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3076
3077 size_t extra_size = size + alignment;
3078 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3079
3080 char* aligned_base = NULL;
3081
3082 do {
3083 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3084 if (extra_base == NULL) {
3085 return NULL;
3086 }
3087 // Do manual alignment
3088 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3089
3090 os::release_memory(extra_base, extra_size);
3091
3092 aligned_base = os::reserve_memory(size, aligned_base);
3093
3094 } while (aligned_base == NULL);
3095
3096 return aligned_base;
3097 }
3098
3099 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3100 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3101 "reserve alignment");
3102 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3103 char* res;
3104 // note that if UseLargePages is on, all the areas that require interleaving
3105 // will go thru reserve_memory_special rather than thru here.
3106 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3107 if (!use_individual) {
3108 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3109 } else {
3110 elapsedTimer reserveTimer;
3111 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3112 // in numa interleaving, we have to allocate pages individually
3113 // (well really chunks of NUMAInterleaveGranularity size)
3114 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3115 if (res == NULL) {
3116 warning("NUMA page allocation failed");
3117 }
3118 if (Verbose && PrintMiscellaneous) {
3119 reserveTimer.stop();
3120 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3121 reserveTimer.milliseconds(), reserveTimer.ticks());
3122 }
3123 }
3124 assert(res == NULL || addr == NULL || addr == res,
3125 "Unexpected address from reserve.");
3126
3127 return res;
3128 }
3129
3130 // Reserve memory at an arbitrary address, only if that area is
3131 // available (and not reserved for something else).
3132 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3133 // Windows os::reserve_memory() fails of the requested address range is
3134 // not avilable.
3135 return reserve_memory(bytes, requested_addr);
3136 }
3137
3138 size_t os::large_page_size() {
3139 return _large_page_size;
3140 }
3141
3142 bool os::can_commit_large_page_memory() {
3143 // Windows only uses large page memory when the entire region is reserved
3144 // and committed in a single VirtualAlloc() call. This may change in the
3145 // future, but with Windows 2003 it's not possible to commit on demand.
3146 return false;
3147 }
3148
3149 bool os::can_execute_large_page_memory() {
3150 return true;
3151 }
3152
3153 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3154 bool exec) {
3155 assert(UseLargePages, "only for large pages");
3156
3157 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3158 return NULL; // Fallback to small pages.
3159 }
3160
3161 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3162 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3163
3164 // with large pages, there are two cases where we need to use Individual Allocation
3165 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3166 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3167 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3168 if (TracePageSizes && Verbose) {
3169 tty->print_cr("Reserving large pages individually.");
3170 }
3171 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3172 if (p_buf == NULL) {
3173 // give an appropriate warning message
3174 if (UseNUMAInterleaving) {
3175 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3176 }
3177 if (UseLargePagesIndividualAllocation) {
3178 warning("Individually allocated large pages failed, "
3179 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3180 }
3181 return NULL;
3182 }
3183
3184 return p_buf;
3185
3186 } else {
3187 if (TracePageSizes && Verbose) {
3188 tty->print_cr("Reserving large pages in a single large chunk.");
3189 }
3190 // normal policy just allocate it all at once
3191 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3192 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3193 if (res != NULL) {
3194 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3195 }
3196
3197 return res;
3198 }
3199 }
3200
3201 bool os::release_memory_special(char* base, size_t bytes) {
3202 assert(base != NULL, "Sanity check");
3203 return release_memory(base, bytes);
3204 }
3205
3206 void os::print_statistics() {
3207 }
3208
3209 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3210 int err = os::get_last_error();
3211 char buf[256];
3212 size_t buf_len = os::lasterror(buf, sizeof(buf));
3213 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3214 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3215 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3216 }
3217
3218 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3219 if (bytes == 0) {
3220 // Don't bother the OS with noops.
3221 return true;
3222 }
3223 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3224 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3225 // Don't attempt to print anything if the OS call fails. We're
3226 // probably low on resources, so the print itself may cause crashes.
3227
3228 // unless we have NUMAInterleaving enabled, the range of a commit
3229 // is always within a reserve covered by a single VirtualAlloc
3230 // in that case we can just do a single commit for the requested size
3231 if (!UseNUMAInterleaving) {
3232 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3233 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3234 return false;
3235 }
3236 if (exec) {
3237 DWORD oldprot;
3238 // Windows doc says to use VirtualProtect to get execute permissions
3239 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3240 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3241 return false;
3242 }
3243 }
3244 return true;
3245 } else {
3246
3247 // when NUMAInterleaving is enabled, the commit might cover a range that
3248 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3249 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3250 // returns represents the number of bytes that can be committed in one step.
3251 size_t bytes_remaining = bytes;
3252 char * next_alloc_addr = addr;
3253 while (bytes_remaining > 0) {
3254 MEMORY_BASIC_INFORMATION alloc_info;
3255 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3256 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3257 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3258 PAGE_READWRITE) == NULL) {
3259 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3260 exec);)
3261 return false;
3262 }
3263 if (exec) {
3264 DWORD oldprot;
3265 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3266 PAGE_EXECUTE_READWRITE, &oldprot)) {
3267 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3268 exec);)
3269 return false;
3270 }
3271 }
3272 bytes_remaining -= bytes_to_rq;
3273 next_alloc_addr += bytes_to_rq;
3274 }
3275 }
3276 // if we made it this far, return true
3277 return true;
3278 }
3279
3280 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3281 bool exec) {
3282 // alignment_hint is ignored on this OS
3283 return pd_commit_memory(addr, size, exec);
3284 }
3285
3286 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3287 const char* mesg) {
3288 assert(mesg != NULL, "mesg must be specified");
3289 if (!pd_commit_memory(addr, size, exec)) {
3290 warn_fail_commit_memory(addr, size, exec);
3291 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3292 }
3293 }
3294
3295 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3296 size_t alignment_hint, bool exec,
3297 const char* mesg) {
3298 // alignment_hint is ignored on this OS
3299 pd_commit_memory_or_exit(addr, size, exec, mesg);
3300 }
3301
3302 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3303 if (bytes == 0) {
3304 // Don't bother the OS with noops.
3305 return true;
3306 }
3307 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3308 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3309 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3310 }
3311
3312 bool os::pd_release_memory(char* addr, size_t bytes) {
3313 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3314 }
3315
3316 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3317 return os::commit_memory(addr, size, !ExecMem);
3318 }
3319
3320 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3321 return os::uncommit_memory(addr, size);
3322 }
3323
3324 // Set protections specified
3325 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3326 bool is_committed) {
3327 unsigned int p = 0;
3328 switch (prot) {
3329 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3330 case MEM_PROT_READ: p = PAGE_READONLY; break;
3331 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3332 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3333 default:
3334 ShouldNotReachHere();
3335 }
3336
3337 DWORD old_status;
3338
3339 // Strange enough, but on Win32 one can change protection only for committed
3340 // memory, not a big deal anyway, as bytes less or equal than 64K
3341 if (!is_committed) {
3342 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3343 "cannot commit protection page");
3344 }
3345 // One cannot use os::guard_memory() here, as on Win32 guard page
3346 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3347 //
3348 // Pages in the region become guard pages. Any attempt to access a guard page
3349 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3350 // the guard page status. Guard pages thus act as a one-time access alarm.
3351 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3352 }
3353
3354 bool os::guard_memory(char* addr, size_t bytes) {
3355 DWORD old_status;
3356 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3357 }
3358
3359 bool os::unguard_memory(char* addr, size_t bytes) {
3360 DWORD old_status;
3361 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3362 }
3363
3364 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3365 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3366 void os::numa_make_global(char *addr, size_t bytes) { }
3367 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3368 bool os::numa_topology_changed() { return false; }
3369 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3370 int os::numa_get_group_id() { return 0; }
3371 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3372 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3373 // Provide an answer for UMA systems
3374 ids[0] = 0;
3375 return 1;
3376 } else {
3377 // check for size bigger than actual groups_num
3378 size = MIN2(size, numa_get_groups_num());
3379 for (int i = 0; i < (int)size; i++) {
3380 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3381 }
3382 return size;
3383 }
3384 }
3385
3386 bool os::get_page_info(char *start, page_info* info) {
3387 return false;
3388 }
3389
3390 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3391 page_info* page_found) {
3392 return end;
3393 }
3394
3395 char* os::non_memory_address_word() {
3396 // Must never look like an address returned by reserve_memory,
3397 // even in its subfields (as defined by the CPU immediate fields,
3398 // if the CPU splits constants across multiple instructions).
3399 return (char*)-1;
3400 }
3401
3402 #define MAX_ERROR_COUNT 100
3403 #define SYS_THREAD_ERROR 0xffffffffUL
3404
3405 void os::pd_start_thread(Thread* thread) {
3406 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3407 // Returns previous suspend state:
3408 // 0: Thread was not suspended
3409 // 1: Thread is running now
3410 // >1: Thread is still suspended.
3411 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3412 }
3413
3414 class HighResolutionInterval : public CHeapObj<mtThread> {
3415 // The default timer resolution seems to be 10 milliseconds.
3416 // (Where is this written down?)
3417 // If someone wants to sleep for only a fraction of the default,
3418 // then we set the timer resolution down to 1 millisecond for
3419 // the duration of their interval.
3420 // We carefully set the resolution back, since otherwise we
3421 // seem to incur an overhead (3%?) that we don't need.
3422 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3423 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3424 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3425 // timeBeginPeriod() if the relative error exceeded some threshold.
3426 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3427 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3428 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3429 // resolution timers running.
3430 private:
3431 jlong resolution;
3432 public:
3433 HighResolutionInterval(jlong ms) {
3434 resolution = ms % 10L;
3435 if (resolution != 0) {
3436 MMRESULT result = timeBeginPeriod(1L);
3437 }
3438 }
3439 ~HighResolutionInterval() {
3440 if (resolution != 0) {
3441 MMRESULT result = timeEndPeriod(1L);
3442 }
3443 resolution = 0L;
3444 }
3445 };
3446
3447 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3448 jlong limit = (jlong) MAXDWORD;
3449
3450 while (ms > limit) {
3451 int res;
3452 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3453 return res;
3454 }
3455 ms -= limit;
3456 }
3457
3458 assert(thread == Thread::current(), "thread consistency check");
3459 OSThread* osthread = thread->osthread();
3460 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3461 int result;
3462 if (interruptable) {
3463 assert(thread->is_Java_thread(), "must be java thread");
3464 JavaThread *jt = (JavaThread *) thread;
3465 ThreadBlockInVM tbivm(jt);
3466
3467 jt->set_suspend_equivalent();
3468 // cleared by handle_special_suspend_equivalent_condition() or
3469 // java_suspend_self() via check_and_wait_while_suspended()
3470
3471 HANDLE events[1];
3472 events[0] = osthread->interrupt_event();
3473 HighResolutionInterval *phri=NULL;
3474 if (!ForceTimeHighResolution) {
3475 phri = new HighResolutionInterval(ms);
3476 }
3477 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3478 result = OS_TIMEOUT;
3479 } else {
3480 ResetEvent(osthread->interrupt_event());
3481 osthread->set_interrupted(false);
3482 result = OS_INTRPT;
3483 }
3484 delete phri; //if it is NULL, harmless
3485
3486 // were we externally suspended while we were waiting?
3487 jt->check_and_wait_while_suspended();
3488 } else {
3489 assert(!thread->is_Java_thread(), "must not be java thread");
3490 Sleep((long) ms);
3491 result = OS_TIMEOUT;
3492 }
3493 return result;
3494 }
3495
3496 // Short sleep, direct OS call.
3497 //
3498 // ms = 0, means allow others (if any) to run.
3499 //
3500 void os::naked_short_sleep(jlong ms) {
3501 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3502 Sleep(ms);
3503 }
3504
3505 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3506 void os::infinite_sleep() {
3507 while (true) { // sleep forever ...
3508 Sleep(100000); // ... 100 seconds at a time
3509 }
3510 }
3511
3512 typedef BOOL (WINAPI * STTSignature)(void);
3513
3514 void os::naked_yield() {
3515 // Use either SwitchToThread() or Sleep(0)
3516 // Consider passing back the return value from SwitchToThread().
3517 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3518 SwitchToThread();
3519 } else {
3520 Sleep(0);
3521 }
3522 }
3523
3524 // Win32 only gives you access to seven real priorities at a time,
3525 // so we compress Java's ten down to seven. It would be better
3526 // if we dynamically adjusted relative priorities.
3527
3528 int os::java_to_os_priority[CriticalPriority + 1] = {
3529 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3530 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3531 THREAD_PRIORITY_LOWEST, // 2
3532 THREAD_PRIORITY_BELOW_NORMAL, // 3
3533 THREAD_PRIORITY_BELOW_NORMAL, // 4
3534 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3535 THREAD_PRIORITY_NORMAL, // 6
3536 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3537 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3538 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3539 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3540 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3541 };
3542
3543 int prio_policy1[CriticalPriority + 1] = {
3544 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3545 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3546 THREAD_PRIORITY_LOWEST, // 2
3547 THREAD_PRIORITY_BELOW_NORMAL, // 3
3548 THREAD_PRIORITY_BELOW_NORMAL, // 4
3549 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3550 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3551 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3552 THREAD_PRIORITY_HIGHEST, // 8
3553 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3554 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3555 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3556 };
3557
3558 static int prio_init() {
3559 // If ThreadPriorityPolicy is 1, switch tables
3560 if (ThreadPriorityPolicy == 1) {
3561 int i;
3562 for (i = 0; i < CriticalPriority + 1; i++) {
3563 os::java_to_os_priority[i] = prio_policy1[i];
3564 }
3565 }
3566 if (UseCriticalJavaThreadPriority) {
3567 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3568 }
3569 return 0;
3570 }
3571
3572 OSReturn os::set_native_priority(Thread* thread, int priority) {
3573 if (!UseThreadPriorities) return OS_OK;
3574 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3575 return ret ? OS_OK : OS_ERR;
3576 }
3577
3578 OSReturn os::get_native_priority(const Thread* const thread,
3579 int* priority_ptr) {
3580 if (!UseThreadPriorities) {
3581 *priority_ptr = java_to_os_priority[NormPriority];
3582 return OS_OK;
3583 }
3584 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3585 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3586 assert(false, "GetThreadPriority failed");
3587 return OS_ERR;
3588 }
3589 *priority_ptr = os_prio;
3590 return OS_OK;
3591 }
3592
3593
3594 // Hint to the underlying OS that a task switch would not be good.
3595 // Void return because it's a hint and can fail.
3596 void os::hint_no_preempt() {}
3597
3598 void os::interrupt(Thread* thread) {
3599 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3600 Threads_lock->owned_by_self(),
3601 "possibility of dangling Thread pointer");
3602
3603 OSThread* osthread = thread->osthread();
3604 osthread->set_interrupted(true);
3605 // More than one thread can get here with the same value of osthread,
3606 // resulting in multiple notifications. We do, however, want the store
3607 // to interrupted() to be visible to other threads before we post
3608 // the interrupt event.
3609 OrderAccess::release();
3610 SetEvent(osthread->interrupt_event());
3611 // For JSR166: unpark after setting status
3612 if (thread->is_Java_thread()) {
3613 ((JavaThread*)thread)->parker()->unpark();
3614 }
3615
3616 ParkEvent * ev = thread->_ParkEvent;
3617 if (ev != NULL) ev->unpark();
3618 }
3619
3620
3621 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3622 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3623 "possibility of dangling Thread pointer");
3624
3625 OSThread* osthread = thread->osthread();
3626 // There is no synchronization between the setting of the interrupt
3627 // and it being cleared here. It is critical - see 6535709 - that
3628 // we only clear the interrupt state, and reset the interrupt event,
3629 // if we are going to report that we were indeed interrupted - else
3630 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3631 // depending on the timing. By checking thread interrupt event to see
3632 // if the thread gets real interrupt thus prevent spurious wakeup.
3633 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3634 if (interrupted && clear_interrupted) {
3635 osthread->set_interrupted(false);
3636 ResetEvent(osthread->interrupt_event());
3637 } // Otherwise leave the interrupted state alone
3638
3639 return interrupted;
3640 }
3641
3642 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3643 ExtendedPC os::get_thread_pc(Thread* thread) {
3644 CONTEXT context;
3645 context.ContextFlags = CONTEXT_CONTROL;
3646 HANDLE handle = thread->osthread()->thread_handle();
3647 #ifdef _M_IA64
3648 assert(0, "Fix get_thread_pc");
3649 return ExtendedPC(NULL);
3650 #else
3651 if (GetThreadContext(handle, &context)) {
3652 #ifdef _M_AMD64
3653 return ExtendedPC((address) context.Rip);
3654 #else
3655 return ExtendedPC((address) context.Eip);
3656 #endif
3657 } else {
3658 return ExtendedPC(NULL);
3659 }
3660 #endif
3661 }
3662
3663 // GetCurrentThreadId() returns DWORD
3664 intx os::current_thread_id() { return GetCurrentThreadId(); }
3665
3666 static int _initial_pid = 0;
3667
3668 int os::current_process_id() {
3669 return (_initial_pid ? _initial_pid : _getpid());
3670 }
3671
3672 int os::win32::_vm_page_size = 0;
3673 int os::win32::_vm_allocation_granularity = 0;
3674 int os::win32::_processor_type = 0;
3675 // Processor level is not available on non-NT systems, use vm_version instead
3676 int os::win32::_processor_level = 0;
3677 julong os::win32::_physical_memory = 0;
3678 size_t os::win32::_default_stack_size = 0;
3679
3680 intx os::win32::_os_thread_limit = 0;
3681 volatile intx os::win32::_os_thread_count = 0;
3682
3683 bool os::win32::_is_nt = false;
3684 bool os::win32::_is_windows_2003 = false;
3685 bool os::win32::_is_windows_server = false;
3686
3687 // 6573254
3688 // Currently, the bug is observed across all the supported Windows releases,
3689 // including the latest one (as of this writing - Windows Server 2012 R2)
3690 bool os::win32::_has_exit_bug = true;
3691 bool os::win32::_has_performance_count = 0;
3692
3693 void os::win32::initialize_system_info() {
3694 SYSTEM_INFO si;
3695 GetSystemInfo(&si);
3696 _vm_page_size = si.dwPageSize;
3697 _vm_allocation_granularity = si.dwAllocationGranularity;
3698 _processor_type = si.dwProcessorType;
3699 _processor_level = si.wProcessorLevel;
3700 set_processor_count(si.dwNumberOfProcessors);
3701
3702 MEMORYSTATUSEX ms;
3703 ms.dwLength = sizeof(ms);
3704
3705 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3706 // dwMemoryLoad (% of memory in use)
3707 GlobalMemoryStatusEx(&ms);
3708 _physical_memory = ms.ullTotalPhys;
3709
3710 OSVERSIONINFOEX oi;
3711 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3712 GetVersionEx((OSVERSIONINFO*)&oi);
3713 switch (oi.dwPlatformId) {
3714 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3715 case VER_PLATFORM_WIN32_NT:
3716 _is_nt = true;
3717 {
3718 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3719 if (os_vers == 5002) {
3720 _is_windows_2003 = true;
3721 }
3722 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3723 oi.wProductType == VER_NT_SERVER) {
3724 _is_windows_server = true;
3725 }
3726 }
3727 break;
3728 default: fatal("Unknown platform");
3729 }
3730
3731 _default_stack_size = os::current_stack_size();
3732 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3733 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3734 "stack size not a multiple of page size");
3735
3736 initialize_performance_counter();
3737
3738 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3739 // known to deadlock the system, if the VM issues to thread operations with
3740 // a too high frequency, e.g., such as changing the priorities.
3741 // The 6000 seems to work well - no deadlocks has been notices on the test
3742 // programs that we have seen experience this problem.
3743 if (!os::win32::is_nt()) {
3744 StarvationMonitorInterval = 6000;
3745 }
3746 }
3747
3748
3749 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3750 int ebuflen) {
3751 char path[MAX_PATH];
3752 DWORD size;
3753 DWORD pathLen = (DWORD)sizeof(path);
3754 HINSTANCE result = NULL;
3755
3756 // only allow library name without path component
3757 assert(strchr(name, '\\') == NULL, "path not allowed");
3758 assert(strchr(name, ':') == NULL, "path not allowed");
3759 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3760 jio_snprintf(ebuf, ebuflen,
3761 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3762 return NULL;
3763 }
3764
3765 // search system directory
3766 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3767 if (size >= pathLen) {
3768 return NULL; // truncated
3769 }
3770 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3771 return NULL; // truncated
3772 }
3773 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3774 return result;
3775 }
3776 }
3777
3778 // try Windows directory
3779 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3780 if (size >= pathLen) {
3781 return NULL; // truncated
3782 }
3783 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3784 return NULL; // truncated
3785 }
3786 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3787 return result;
3788 }
3789 }
3790
3791 jio_snprintf(ebuf, ebuflen,
3792 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3793 return NULL;
3794 }
3795
3796 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3797
3798 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3799 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3800 return TRUE;
3801 }
3802
3803 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3804 // Basic approach:
3805 // - Each exiting thread registers its intent to exit and then does so.
3806 // - A thread trying to terminate the process must wait for all
3807 // threads currently exiting to complete their exit.
3808
3809 if (os::win32::has_exit_bug()) {
3810 // The array holds handles of the threads that have started exiting by calling
3811 // _endthreadex().
3812 // Should be large enough to avoid blocking the exiting thread due to lack of
3813 // a free slot.
3814 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3815 static int handle_count = 0;
3816
3817 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3818 static CRITICAL_SECTION crit_sect;
3819 static volatile jint process_exiting = 0;
3820 int i, j;
3821 DWORD res;
3822 HANDLE hproc, hthr;
3823
3824 // The first thread that reached this point, initializes the critical section.
3825 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3826 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3827 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3828 EnterCriticalSection(&crit_sect);
3829
3830 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3831 // Remove from the array those handles of the threads that have completed exiting.
3832 for (i = 0, j = 0; i < handle_count; ++i) {
3833 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3834 if (res == WAIT_TIMEOUT) {
3835 handles[j++] = handles[i];
3836 } else {
3837 if (res == WAIT_FAILED) {
3838 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3839 GetLastError(), __FILE__, __LINE__);
3840 }
3841 // Don't keep the handle, if we failed waiting for it.
3842 CloseHandle(handles[i]);
3843 }
3844 }
3845
3846 // If there's no free slot in the array of the kept handles, we'll have to
3847 // wait until at least one thread completes exiting.
3848 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3849 // Raise the priority of the oldest exiting thread to increase its chances
3850 // to complete sooner.
3851 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3852 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3853 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3854 i = (res - WAIT_OBJECT_0);
3855 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3856 for (; i < handle_count; ++i) {
3857 handles[i] = handles[i + 1];
3858 }
3859 } else {
3860 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3861 (res == WAIT_FAILED ? "failed" : "timed out"),
3862 GetLastError(), __FILE__, __LINE__);
3863 // Don't keep handles, if we failed waiting for them.
3864 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3865 CloseHandle(handles[i]);
3866 }
3867 handle_count = 0;
3868 }
3869 }
3870
3871 // Store a duplicate of the current thread handle in the array of handles.
3872 hproc = GetCurrentProcess();
3873 hthr = GetCurrentThread();
3874 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3875 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3876 warning("DuplicateHandle failed (%u) in %s: %d\n",
3877 GetLastError(), __FILE__, __LINE__);
3878 } else {
3879 ++handle_count;
3880 }
3881
3882 // The current exiting thread has stored its handle in the array, and now
3883 // should leave the critical section before calling _endthreadex().
3884
3885 } else if (what != EPT_THREAD) {
3886 if (handle_count > 0) {
3887 // Before ending the process, make sure all the threads that had called
3888 // _endthreadex() completed.
3889
3890 // Set the priority level of the current thread to the same value as
3891 // the priority level of exiting threads.
3892 // This is to ensure it will be given a fair chance to execute if
3893 // the timeout expires.
3894 hthr = GetCurrentThread();
3895 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3896 for (i = 0; i < handle_count; ++i) {
3897 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3898 }
3899 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3900 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3901 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3902 (res == WAIT_FAILED ? "failed" : "timed out"),
3903 GetLastError(), __FILE__, __LINE__);
3904 }
3905 for (i = 0; i < handle_count; ++i) {
3906 CloseHandle(handles[i]);
3907 }
3908 handle_count = 0;
3909 }
3910
3911 OrderAccess::release_store(&process_exiting, 1);
3912 }
3913
3914 LeaveCriticalSection(&crit_sect);
3915 }
3916
3917 if (what == EPT_THREAD) {
3918 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3919 // Some other thread is about to call exit(), so we
3920 // don't let the current thread proceed to _endthreadex()
3921 SuspendThread(GetCurrentThread());
3922 // Avoid busy-wait loop, if SuspendThread() failed.
3923 Sleep(EXIT_TIMEOUT);
3924 }
3925 }
3926 }
3927
3928 // We are here if either
3929 // - there's no 'race at exit' bug on this OS release;
3930 // - initialization of the critical section failed (unlikely);
3931 // - the current thread has stored its handle and left the critical section;
3932 // - the process-exiting thread has raised the flag and left the critical section.
3933 if (what == EPT_THREAD) {
3934 _endthreadex((unsigned)exit_code);
3935 } else if (what == EPT_PROCESS) {
3936 ::exit(exit_code);
3937 } else {
3938 _exit(exit_code);
3939 }
3940
3941 // Should not reach here
3942 return exit_code;
3943 }
3944
3945 #undef EXIT_TIMEOUT
3946
3947 void os::win32::setmode_streams() {
3948 _setmode(_fileno(stdin), _O_BINARY);
3949 _setmode(_fileno(stdout), _O_BINARY);
3950 _setmode(_fileno(stderr), _O_BINARY);
3951 }
3952
3953
3954 bool os::is_debugger_attached() {
3955 return IsDebuggerPresent() ? true : false;
3956 }
3957
3958
3959 void os::wait_for_keypress_at_exit(void) {
3960 if (PauseAtExit) {
3961 fprintf(stderr, "Press any key to continue...\n");
3962 fgetc(stdin);
3963 }
3964 }
3965
3966
3967 int os::message_box(const char* title, const char* message) {
3968 int result = MessageBox(NULL, message, title,
3969 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3970 return result == IDYES;
3971 }
3972
3973 int os::allocate_thread_local_storage() {
3974 return TlsAlloc();
3975 }
3976
3977
3978 void os::free_thread_local_storage(int index) {
3979 TlsFree(index);
3980 }
3981
3982
3983 void os::thread_local_storage_at_put(int index, void* value) {
3984 TlsSetValue(index, value);
3985 assert(thread_local_storage_at(index) == value, "Just checking");
3986 }
3987
3988
3989 void* os::thread_local_storage_at(int index) {
3990 return TlsGetValue(index);
3991 }
3992
3993
3994 #ifndef PRODUCT
3995 #ifndef _WIN64
3996 // Helpers to check whether NX protection is enabled
3997 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3998 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3999 pex->ExceptionRecord->NumberParameters > 0 &&
4000 pex->ExceptionRecord->ExceptionInformation[0] ==
4001 EXCEPTION_INFO_EXEC_VIOLATION) {
4002 return EXCEPTION_EXECUTE_HANDLER;
4003 }
4004 return EXCEPTION_CONTINUE_SEARCH;
4005 }
4006
4007 void nx_check_protection() {
4008 // If NX is enabled we'll get an exception calling into code on the stack
4009 char code[] = { (char)0xC3 }; // ret
4010 void *code_ptr = (void *)code;
4011 __try {
4012 __asm call code_ptr
4013 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4014 tty->print_raw_cr("NX protection detected.");
4015 }
4016 }
4017 #endif // _WIN64
4018 #endif // PRODUCT
4019
4020 // this is called _before_ the global arguments have been parsed
4021 void os::init(void) {
4022 _initial_pid = _getpid();
4023
4024 init_random(1234567);
4025
4026 win32::initialize_system_info();
4027 win32::setmode_streams();
4028 init_page_sizes((size_t) win32::vm_page_size());
4029
4030 // This may be overridden later when argument processing is done.
4031 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4032 os::win32::is_windows_2003());
4033
4034 // Initialize main_process and main_thread
4035 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4036 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4037 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4038 fatal("DuplicateHandle failed\n");
4039 }
4040 main_thread_id = (int) GetCurrentThreadId();
4041 }
4042
4043 // To install functions for atexit processing
4044 extern "C" {
4045 static void perfMemory_exit_helper() {
4046 perfMemory_exit();
4047 }
4048 }
4049
4050 static jint initSock();
4051
4052 // this is called _after_ the global arguments have been parsed
4053 jint os::init_2(void) {
4054 // Allocate a single page and mark it as readable for safepoint polling
4055 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4056 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4057
4058 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4059 guarantee(return_page != NULL, "Commit Failed for polling page");
4060
4061 os::set_polling_page(polling_page);
4062
4063 #ifndef PRODUCT
4064 if (Verbose && PrintMiscellaneous) {
4065 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4066 (intptr_t)polling_page);
4067 }
4068 #endif
4069
4070 if (!UseMembar) {
4071 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4072 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4073
4074 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4075 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4076
4077 os::set_memory_serialize_page(mem_serialize_page);
4078
4079 #ifndef PRODUCT
4080 if (Verbose && PrintMiscellaneous) {
4081 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4082 (intptr_t)mem_serialize_page);
4083 }
4084 #endif
4085 }
4086
4087 // Setup Windows Exceptions
4088
4089 // for debugging float code generation bugs
4090 if (ForceFloatExceptions) {
4091 #ifndef _WIN64
4092 static long fp_control_word = 0;
4093 __asm { fstcw fp_control_word }
4094 // see Intel PPro Manual, Vol. 2, p 7-16
4095 const long precision = 0x20;
4096 const long underflow = 0x10;
4097 const long overflow = 0x08;
4098 const long zero_div = 0x04;
4099 const long denorm = 0x02;
4100 const long invalid = 0x01;
4101 fp_control_word |= invalid;
4102 __asm { fldcw fp_control_word }
4103 #endif
4104 }
4105
4106 // If stack_commit_size is 0, windows will reserve the default size,
4107 // but only commit a small portion of it.
4108 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4109 size_t default_reserve_size = os::win32::default_stack_size();
4110 size_t actual_reserve_size = stack_commit_size;
4111 if (stack_commit_size < default_reserve_size) {
4112 // If stack_commit_size == 0, we want this too
4113 actual_reserve_size = default_reserve_size;
4114 }
4115
4116 // Check minimum allowable stack size for thread creation and to initialize
4117 // the java system classes, including StackOverflowError - depends on page
4118 // size. Add a page for compiler2 recursion in main thread.
4119 // Add in 2*BytesPerWord times page size to account for VM stack during
4120 // class initialization depending on 32 or 64 bit VM.
4121 size_t min_stack_allowed =
4122 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4123 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4124 if (actual_reserve_size < min_stack_allowed) {
4125 tty->print_cr("\nThe stack size specified is too small, "
4126 "Specify at least %dk",
4127 min_stack_allowed / K);
4128 return JNI_ERR;
4129 }
4130
4131 JavaThread::set_stack_size_at_create(stack_commit_size);
4132
4133 // Calculate theoretical max. size of Threads to guard gainst artifical
4134 // out-of-memory situations, where all available address-space has been
4135 // reserved by thread stacks.
4136 assert(actual_reserve_size != 0, "Must have a stack");
4137
4138 // Calculate the thread limit when we should start doing Virtual Memory
4139 // banging. Currently when the threads will have used all but 200Mb of space.
4140 //
4141 // TODO: consider performing a similar calculation for commit size instead
4142 // as reserve size, since on a 64-bit platform we'll run into that more
4143 // often than running out of virtual memory space. We can use the
4144 // lower value of the two calculations as the os_thread_limit.
4145 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4146 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4147
4148 // at exit methods are called in the reverse order of their registration.
4149 // there is no limit to the number of functions registered. atexit does
4150 // not set errno.
4151
4152 if (PerfAllowAtExitRegistration) {
4153 // only register atexit functions if PerfAllowAtExitRegistration is set.
4154 // atexit functions can be delayed until process exit time, which
4155 // can be problematic for embedded VM situations. Embedded VMs should
4156 // call DestroyJavaVM() to assure that VM resources are released.
4157
4158 // note: perfMemory_exit_helper atexit function may be removed in
4159 // the future if the appropriate cleanup code can be added to the
4160 // VM_Exit VMOperation's doit method.
4161 if (atexit(perfMemory_exit_helper) != 0) {
4162 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4163 }
4164 }
4165
4166 #ifndef _WIN64
4167 // Print something if NX is enabled (win32 on AMD64)
4168 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4169 #endif
4170
4171 // initialize thread priority policy
4172 prio_init();
4173
4174 if (UseNUMA && !ForceNUMA) {
4175 UseNUMA = false; // We don't fully support this yet
4176 }
4177
4178 if (UseNUMAInterleaving) {
4179 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4180 bool success = numa_interleaving_init();
4181 if (!success) UseNUMAInterleaving = false;
4182 }
4183
4184 if (initSock() != JNI_OK) {
4185 return JNI_ERR;
4186 }
4187
4188 return JNI_OK;
4189 }
4190
4191 // Mark the polling page as unreadable
4192 void os::make_polling_page_unreadable(void) {
4193 DWORD old_status;
4194 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4195 PAGE_NOACCESS, &old_status)) {
4196 fatal("Could not disable polling page");
4197 }
4198 }
4199
4200 // Mark the polling page as readable
4201 void os::make_polling_page_readable(void) {
4202 DWORD old_status;
4203 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4204 PAGE_READONLY, &old_status)) {
4205 fatal("Could not enable polling page");
4206 }
4207 }
4208
4209
4210 int os::stat(const char *path, struct stat *sbuf) {
4211 char pathbuf[MAX_PATH];
4212 if (strlen(path) > MAX_PATH - 1) {
4213 errno = ENAMETOOLONG;
4214 return -1;
4215 }
4216 os::native_path(strcpy(pathbuf, path));
4217 int ret = ::stat(pathbuf, sbuf);
4218 if (sbuf != NULL && UseUTCFileTimestamp) {
4219 // Fix for 6539723. st_mtime returned from stat() is dependent on
4220 // the system timezone and so can return different values for the
4221 // same file if/when daylight savings time changes. This adjustment
4222 // makes sure the same timestamp is returned regardless of the TZ.
4223 //
4224 // See:
4225 // http://msdn.microsoft.com/library/
4226 // default.asp?url=/library/en-us/sysinfo/base/
4227 // time_zone_information_str.asp
4228 // and
4229 // http://msdn.microsoft.com/library/default.asp?url=
4230 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4231 //
4232 // NOTE: there is a insidious bug here: If the timezone is changed
4233 // after the call to stat() but before 'GetTimeZoneInformation()', then
4234 // the adjustment we do here will be wrong and we'll return the wrong
4235 // value (which will likely end up creating an invalid class data
4236 // archive). Absent a better API for this, or some time zone locking
4237 // mechanism, we'll have to live with this risk.
4238 TIME_ZONE_INFORMATION tz;
4239 DWORD tzid = GetTimeZoneInformation(&tz);
4240 int daylightBias =
4241 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4242 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4243 }
4244 return ret;
4245 }
4246
4247
4248 #define FT2INT64(ft) \
4249 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4250
4251
4252 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4253 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4254 // of a thread.
4255 //
4256 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4257 // the fast estimate available on the platform.
4258
4259 // current_thread_cpu_time() is not optimized for Windows yet
4260 jlong os::current_thread_cpu_time() {
4261 // return user + sys since the cost is the same
4262 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4263 }
4264
4265 jlong os::thread_cpu_time(Thread* thread) {
4266 // consistent with what current_thread_cpu_time() returns.
4267 return os::thread_cpu_time(thread, true /* user+sys */);
4268 }
4269
4270 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4271 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4272 }
4273
4274 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4275 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4276 // If this function changes, os::is_thread_cpu_time_supported() should too
4277 if (os::win32::is_nt()) {
4278 FILETIME CreationTime;
4279 FILETIME ExitTime;
4280 FILETIME KernelTime;
4281 FILETIME UserTime;
4282
4283 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4284 &ExitTime, &KernelTime, &UserTime) == 0) {
4285 return -1;
4286 } else if (user_sys_cpu_time) {
4287 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4288 } else {
4289 return FT2INT64(UserTime) * 100;
4290 }
4291 } else {
4292 return (jlong) timeGetTime() * 1000000;
4293 }
4294 }
4295
4296 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4297 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4298 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4299 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4300 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4301 }
4302
4303 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4304 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4305 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4306 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4307 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4308 }
4309
4310 bool os::is_thread_cpu_time_supported() {
4311 // see os::thread_cpu_time
4312 if (os::win32::is_nt()) {
4313 FILETIME CreationTime;
4314 FILETIME ExitTime;
4315 FILETIME KernelTime;
4316 FILETIME UserTime;
4317
4318 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4319 &KernelTime, &UserTime) == 0) {
4320 return false;
4321 } else {
4322 return true;
4323 }
4324 } else {
4325 return false;
4326 }
4327 }
4328
4329 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4330 // It does have primitives (PDH API) to get CPU usage and run queue length.
4331 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4332 // If we wanted to implement loadavg on Windows, we have a few options:
4333 //
4334 // a) Query CPU usage and run queue length and "fake" an answer by
4335 // returning the CPU usage if it's under 100%, and the run queue
4336 // length otherwise. It turns out that querying is pretty slow
4337 // on Windows, on the order of 200 microseconds on a fast machine.
4338 // Note that on the Windows the CPU usage value is the % usage
4339 // since the last time the API was called (and the first call
4340 // returns 100%), so we'd have to deal with that as well.
4341 //
4342 // b) Sample the "fake" answer using a sampling thread and store
4343 // the answer in a global variable. The call to loadavg would
4344 // just return the value of the global, avoiding the slow query.
4345 //
4346 // c) Sample a better answer using exponential decay to smooth the
4347 // value. This is basically the algorithm used by UNIX kernels.
4348 //
4349 // Note that sampling thread starvation could affect both (b) and (c).
4350 int os::loadavg(double loadavg[], int nelem) {
4351 return -1;
4352 }
4353
4354
4355 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4356 bool os::dont_yield() {
4357 return DontYieldALot;
4358 }
4359
4360 // This method is a slightly reworked copy of JDK's sysOpen
4361 // from src/windows/hpi/src/sys_api_md.c
4362
4363 int os::open(const char *path, int oflag, int mode) {
4364 char pathbuf[MAX_PATH];
4365
4366 if (strlen(path) > MAX_PATH - 1) {
4367 errno = ENAMETOOLONG;
4368 return -1;
4369 }
4370 os::native_path(strcpy(pathbuf, path));
4371 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4372 }
4373
4374 FILE* os::open(int fd, const char* mode) {
4375 return ::_fdopen(fd, mode);
4376 }
4377
4378 // Is a (classpath) directory empty?
4379 bool os::dir_is_empty(const char* path) {
4380 WIN32_FIND_DATA fd;
4381 HANDLE f = FindFirstFile(path, &fd);
4382 if (f == INVALID_HANDLE_VALUE) {
4383 return true;
4384 }
4385 FindClose(f);
4386 return false;
4387 }
4388
4389 // create binary file, rewriting existing file if required
4390 int os::create_binary_file(const char* path, bool rewrite_existing) {
4391 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4392 if (!rewrite_existing) {
4393 oflags |= _O_EXCL;
4394 }
4395 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4396 }
4397
4398 // return current position of file pointer
4399 jlong os::current_file_offset(int fd) {
4400 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4401 }
4402
4403 // move file pointer to the specified offset
4404 jlong os::seek_to_file_offset(int fd, jlong offset) {
4405 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4406 }
4407
4408
4409 jlong os::lseek(int fd, jlong offset, int whence) {
4410 return (jlong) ::_lseeki64(fd, offset, whence);
4411 }
4412
4413 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4414 OVERLAPPED ov;
4415 DWORD nread;
4416 BOOL result;
4417
4418 ZeroMemory(&ov, sizeof(ov));
4419 ov.Offset = (DWORD)offset;
4420 ov.OffsetHigh = (DWORD)(offset >> 32);
4421
4422 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4423
4424 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4425
4426 return result ? nread : 0;
4427 }
4428
4429
4430 // This method is a slightly reworked copy of JDK's sysNativePath
4431 // from src/windows/hpi/src/path_md.c
4432
4433 // Convert a pathname to native format. On win32, this involves forcing all
4434 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4435 // sometimes rejects '/') and removing redundant separators. The input path is
4436 // assumed to have been converted into the character encoding used by the local
4437 // system. Because this might be a double-byte encoding, care is taken to
4438 // treat double-byte lead characters correctly.
4439 //
4440 // This procedure modifies the given path in place, as the result is never
4441 // longer than the original. There is no error return; this operation always
4442 // succeeds.
4443 char * os::native_path(char *path) {
4444 char *src = path, *dst = path, *end = path;
4445 char *colon = NULL; // If a drive specifier is found, this will
4446 // point to the colon following the drive letter
4447
4448 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4449 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4450 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4451
4452 // Check for leading separators
4453 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4454 while (isfilesep(*src)) {
4455 src++;
4456 }
4457
4458 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4459 // Remove leading separators if followed by drive specifier. This
4460 // hack is necessary to support file URLs containing drive
4461 // specifiers (e.g., "file://c:/path"). As a side effect,
4462 // "/c:/path" can be used as an alternative to "c:/path".
4463 *dst++ = *src++;
4464 colon = dst;
4465 *dst++ = ':';
4466 src++;
4467 } else {
4468 src = path;
4469 if (isfilesep(src[0]) && isfilesep(src[1])) {
4470 // UNC pathname: Retain first separator; leave src pointed at
4471 // second separator so that further separators will be collapsed
4472 // into the second separator. The result will be a pathname
4473 // beginning with "\\\\" followed (most likely) by a host name.
4474 src = dst = path + 1;
4475 path[0] = '\\'; // Force first separator to '\\'
4476 }
4477 }
4478
4479 end = dst;
4480
4481 // Remove redundant separators from remainder of path, forcing all
4482 // separators to be '\\' rather than '/'. Also, single byte space
4483 // characters are removed from the end of the path because those
4484 // are not legal ending characters on this operating system.
4485 //
4486 while (*src != '\0') {
4487 if (isfilesep(*src)) {
4488 *dst++ = '\\'; src++;
4489 while (isfilesep(*src)) src++;
4490 if (*src == '\0') {
4491 // Check for trailing separator
4492 end = dst;
4493 if (colon == dst - 2) break; // "z:\\"
4494 if (dst == path + 1) break; // "\\"
4495 if (dst == path + 2 && isfilesep(path[0])) {
4496 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4497 // beginning of a UNC pathname. Even though it is not, by
4498 // itself, a valid UNC pathname, we leave it as is in order
4499 // to be consistent with the path canonicalizer as well
4500 // as the win32 APIs, which treat this case as an invalid
4501 // UNC pathname rather than as an alias for the root
4502 // directory of the current drive.
4503 break;
4504 }
4505 end = --dst; // Path does not denote a root directory, so
4506 // remove trailing separator
4507 break;
4508 }
4509 end = dst;
4510 } else {
4511 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4512 *dst++ = *src++;
4513 if (*src) *dst++ = *src++;
4514 end = dst;
4515 } else { // Copy a single-byte character
4516 char c = *src++;
4517 *dst++ = c;
4518 // Space is not a legal ending character
4519 if (c != ' ') end = dst;
4520 }
4521 }
4522 }
4523
4524 *end = '\0';
4525
4526 // For "z:", add "." to work around a bug in the C runtime library
4527 if (colon == dst - 1) {
4528 path[2] = '.';
4529 path[3] = '\0';
4530 }
4531
4532 return path;
4533 }
4534
4535 // This code is a copy of JDK's sysSetLength
4536 // from src/windows/hpi/src/sys_api_md.c
4537
4538 int os::ftruncate(int fd, jlong length) {
4539 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4540 long high = (long)(length >> 32);
4541 DWORD ret;
4542
4543 if (h == (HANDLE)(-1)) {
4544 return -1;
4545 }
4546
4547 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4548 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4549 return -1;
4550 }
4551
4552 if (::SetEndOfFile(h) == FALSE) {
4553 return -1;
4554 }
4555
4556 return 0;
4557 }
4558
4559
4560 // This code is a copy of JDK's sysSync
4561 // from src/windows/hpi/src/sys_api_md.c
4562 // except for the legacy workaround for a bug in Win 98
4563
4564 int os::fsync(int fd) {
4565 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4566
4567 if ((!::FlushFileBuffers(handle)) &&
4568 (GetLastError() != ERROR_ACCESS_DENIED)) {
4569 // from winerror.h
4570 return -1;
4571 }
4572 return 0;
4573 }
4574
4575 static int nonSeekAvailable(int, long *);
4576 static int stdinAvailable(int, long *);
4577
4578 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4579 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4580
4581 // This code is a copy of JDK's sysAvailable
4582 // from src/windows/hpi/src/sys_api_md.c
4583
4584 int os::available(int fd, jlong *bytes) {
4585 jlong cur, end;
4586 struct _stati64 stbuf64;
4587
4588 if (::_fstati64(fd, &stbuf64) >= 0) {
4589 int mode = stbuf64.st_mode;
4590 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4591 int ret;
4592 long lpbytes;
4593 if (fd == 0) {
4594 ret = stdinAvailable(fd, &lpbytes);
4595 } else {
4596 ret = nonSeekAvailable(fd, &lpbytes);
4597 }
4598 (*bytes) = (jlong)(lpbytes);
4599 return ret;
4600 }
4601 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4602 return FALSE;
4603 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4604 return FALSE;
4605 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4606 return FALSE;
4607 }
4608 *bytes = end - cur;
4609 return TRUE;
4610 } else {
4611 return FALSE;
4612 }
4613 }
4614
4615 // This code is a copy of JDK's nonSeekAvailable
4616 // from src/windows/hpi/src/sys_api_md.c
4617
4618 static int nonSeekAvailable(int fd, long *pbytes) {
4619 // This is used for available on non-seekable devices
4620 // (like both named and anonymous pipes, such as pipes
4621 // connected to an exec'd process).
4622 // Standard Input is a special case.
4623 HANDLE han;
4624
4625 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4626 return FALSE;
4627 }
4628
4629 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4630 // PeekNamedPipe fails when at EOF. In that case we
4631 // simply make *pbytes = 0 which is consistent with the
4632 // behavior we get on Solaris when an fd is at EOF.
4633 // The only alternative is to raise an Exception,
4634 // which isn't really warranted.
4635 //
4636 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4637 return FALSE;
4638 }
4639 *pbytes = 0;
4640 }
4641 return TRUE;
4642 }
4643
4644 #define MAX_INPUT_EVENTS 2000
4645
4646 // This code is a copy of JDK's stdinAvailable
4647 // from src/windows/hpi/src/sys_api_md.c
4648
4649 static int stdinAvailable(int fd, long *pbytes) {
4650 HANDLE han;
4651 DWORD numEventsRead = 0; // Number of events read from buffer
4652 DWORD numEvents = 0; // Number of events in buffer
4653 DWORD i = 0; // Loop index
4654 DWORD curLength = 0; // Position marker
4655 DWORD actualLength = 0; // Number of bytes readable
4656 BOOL error = FALSE; // Error holder
4657 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4658
4659 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4660 return FALSE;
4661 }
4662
4663 // Construct an array of input records in the console buffer
4664 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4665 if (error == 0) {
4666 return nonSeekAvailable(fd, pbytes);
4667 }
4668
4669 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4670 if (numEvents > MAX_INPUT_EVENTS) {
4671 numEvents = MAX_INPUT_EVENTS;
4672 }
4673
4674 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4675 if (lpBuffer == NULL) {
4676 return FALSE;
4677 }
4678
4679 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4680 if (error == 0) {
4681 os::free(lpBuffer);
4682 return FALSE;
4683 }
4684
4685 // Examine input records for the number of bytes available
4686 for (i=0; i<numEvents; i++) {
4687 if (lpBuffer[i].EventType == KEY_EVENT) {
4688
4689 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4690 &(lpBuffer[i].Event);
4691 if (keyRecord->bKeyDown == TRUE) {
4692 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4693 curLength++;
4694 if (*keyPressed == '\r') {
4695 actualLength = curLength;
4696 }
4697 }
4698 }
4699 }
4700
4701 if (lpBuffer != NULL) {
4702 os::free(lpBuffer);
4703 }
4704
4705 *pbytes = (long) actualLength;
4706 return TRUE;
4707 }
4708
4709 // Map a block of memory.
4710 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4711 char *addr, size_t bytes, bool read_only,
4712 bool allow_exec) {
4713 HANDLE hFile;
4714 char* base;
4715
4716 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4717 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4718 if (hFile == NULL) {
4719 if (PrintMiscellaneous && Verbose) {
4720 DWORD err = GetLastError();
4721 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4722 }
4723 return NULL;
4724 }
4725
4726 if (allow_exec) {
4727 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4728 // unless it comes from a PE image (which the shared archive is not.)
4729 // Even VirtualProtect refuses to give execute access to mapped memory
4730 // that was not previously executable.
4731 //
4732 // Instead, stick the executable region in anonymous memory. Yuck.
4733 // Penalty is that ~4 pages will not be shareable - in the future
4734 // we might consider DLLizing the shared archive with a proper PE
4735 // header so that mapping executable + sharing is possible.
4736
4737 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4738 PAGE_READWRITE);
4739 if (base == NULL) {
4740 if (PrintMiscellaneous && Verbose) {
4741 DWORD err = GetLastError();
4742 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4743 }
4744 CloseHandle(hFile);
4745 return NULL;
4746 }
4747
4748 DWORD bytes_read;
4749 OVERLAPPED overlapped;
4750 overlapped.Offset = (DWORD)file_offset;
4751 overlapped.OffsetHigh = 0;
4752 overlapped.hEvent = NULL;
4753 // ReadFile guarantees that if the return value is true, the requested
4754 // number of bytes were read before returning.
4755 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4756 if (!res) {
4757 if (PrintMiscellaneous && Verbose) {
4758 DWORD err = GetLastError();
4759 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4760 }
4761 release_memory(base, bytes);
4762 CloseHandle(hFile);
4763 return NULL;
4764 }
4765 } else {
4766 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4767 NULL /* file_name */);
4768 if (hMap == NULL) {
4769 if (PrintMiscellaneous && Verbose) {
4770 DWORD err = GetLastError();
4771 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4772 }
4773 CloseHandle(hFile);
4774 return NULL;
4775 }
4776
4777 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4778 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4779 (DWORD)bytes, addr);
4780 if (base == NULL) {
4781 if (PrintMiscellaneous && Verbose) {
4782 DWORD err = GetLastError();
4783 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4784 }
4785 CloseHandle(hMap);
4786 CloseHandle(hFile);
4787 return NULL;
4788 }
4789
4790 if (CloseHandle(hMap) == 0) {
4791 if (PrintMiscellaneous && Verbose) {
4792 DWORD err = GetLastError();
4793 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4794 }
4795 CloseHandle(hFile);
4796 return base;
4797 }
4798 }
4799
4800 if (allow_exec) {
4801 DWORD old_protect;
4802 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4803 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4804
4805 if (!res) {
4806 if (PrintMiscellaneous && Verbose) {
4807 DWORD err = GetLastError();
4808 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4809 }
4810 // Don't consider this a hard error, on IA32 even if the
4811 // VirtualProtect fails, we should still be able to execute
4812 CloseHandle(hFile);
4813 return base;
4814 }
4815 }
4816
4817 if (CloseHandle(hFile) == 0) {
4818 if (PrintMiscellaneous && Verbose) {
4819 DWORD err = GetLastError();
4820 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4821 }
4822 return base;
4823 }
4824
4825 return base;
4826 }
4827
4828
4829 // Remap a block of memory.
4830 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4831 char *addr, size_t bytes, bool read_only,
4832 bool allow_exec) {
4833 // This OS does not allow existing memory maps to be remapped so we
4834 // have to unmap the memory before we remap it.
4835 if (!os::unmap_memory(addr, bytes)) {
4836 return NULL;
4837 }
4838
4839 // There is a very small theoretical window between the unmap_memory()
4840 // call above and the map_memory() call below where a thread in native
4841 // code may be able to access an address that is no longer mapped.
4842
4843 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4844 read_only, allow_exec);
4845 }
4846
4847
4848 // Unmap a block of memory.
4849 // Returns true=success, otherwise false.
4850
4851 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4852 BOOL result = UnmapViewOfFile(addr);
4853 if (result == 0) {
4854 if (PrintMiscellaneous && Verbose) {
4855 DWORD err = GetLastError();
4856 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4857 }
4858 return false;
4859 }
4860 return true;
4861 }
4862
4863 void os::pause() {
4864 char filename[MAX_PATH];
4865 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4866 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4867 } else {
4868 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4869 }
4870
4871 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4872 if (fd != -1) {
4873 struct stat buf;
4874 ::close(fd);
4875 while (::stat(filename, &buf) == 0) {
4876 Sleep(100);
4877 }
4878 } else {
4879 jio_fprintf(stderr,
4880 "Could not open pause file '%s', continuing immediately.\n", filename);
4881 }
4882 }
4883
4884 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4885 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4886 }
4887
4888 // See the caveats for this class in os_windows.hpp
4889 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4890 // into this method and returns false. If no OS EXCEPTION was raised, returns
4891 // true.
4892 // The callback is supposed to provide the method that should be protected.
4893 //
4894 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4895 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4896 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4897 "crash_protection already set?");
4898
4899 bool success = true;
4900 __try {
4901 WatcherThread::watcher_thread()->set_crash_protection(this);
4902 cb.call();
4903 } __except(EXCEPTION_EXECUTE_HANDLER) {
4904 // only for protection, nothing to do
4905 success = false;
4906 }
4907 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4908 return success;
4909 }
4910
4911 // An Event wraps a win32 "CreateEvent" kernel handle.
4912 //
4913 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4914 //
4915 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4916 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4917 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4918 // In addition, an unpark() operation might fetch the handle field, but the
4919 // event could recycle between the fetch and the SetEvent() operation.
4920 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4921 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4922 // on an stale but recycled handle would be harmless, but in practice this might
4923 // confuse other non-Sun code, so it's not a viable approach.
4924 //
4925 // 2: Once a win32 event handle is associated with an Event, it remains associated
4926 // with the Event. The event handle is never closed. This could be construed
4927 // as handle leakage, but only up to the maximum # of threads that have been extant
4928 // at any one time. This shouldn't be an issue, as windows platforms typically
4929 // permit a process to have hundreds of thousands of open handles.
4930 //
4931 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4932 // and release unused handles.
4933 //
4934 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4935 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4936 //
4937 // 5. Use an RCU-like mechanism (Read-Copy Update).
4938 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4939 //
4940 // We use (2).
4941 //
4942 // TODO-FIXME:
4943 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4944 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4945 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4946 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4947 // into a single win32 CreateEvent() handle.
4948 //
4949 // Assumption:
4950 // Only one parker can exist on an event, which is why we allocate
4951 // them per-thread. Multiple unparkers can coexist.
4952 //
4953 // _Event transitions in park()
4954 // -1 => -1 : illegal
4955 // 1 => 0 : pass - return immediately
4956 // 0 => -1 : block; then set _Event to 0 before returning
4957 //
4958 // _Event transitions in unpark()
4959 // 0 => 1 : just return
4960 // 1 => 1 : just return
4961 // -1 => either 0 or 1; must signal target thread
4962 // That is, we can safely transition _Event from -1 to either
4963 // 0 or 1.
4964 //
4965 // _Event serves as a restricted-range semaphore.
4966 // -1 : thread is blocked, i.e. there is a waiter
4967 // 0 : neutral: thread is running or ready,
4968 // could have been signaled after a wait started
4969 // 1 : signaled - thread is running or ready
4970 //
4971 // Another possible encoding of _Event would be with
4972 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4973 //
4974
4975 int os::PlatformEvent::park(jlong Millis) {
4976 // Transitions for _Event:
4977 // -1 => -1 : illegal
4978 // 1 => 0 : pass - return immediately
4979 // 0 => -1 : block; then set _Event to 0 before returning
4980
4981 guarantee(_ParkHandle != NULL , "Invariant");
4982 guarantee(Millis > 0 , "Invariant");
4983
4984 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4985 // the initial park() operation.
4986 // Consider: use atomic decrement instead of CAS-loop
4987
4988 int v;
4989 for (;;) {
4990 v = _Event;
4991 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4992 }
4993 guarantee((v == 0) || (v == 1), "invariant");
4994 if (v != 0) return OS_OK;
4995
4996 // Do this the hard way by blocking ...
4997 // TODO: consider a brief spin here, gated on the success of recent
4998 // spin attempts by this thread.
4999 //
5000 // We decompose long timeouts into series of shorter timed waits.
5001 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5002 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5003 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5004 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5005 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5006 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5007 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5008 // for the already waited time. This policy does not admit any new outcomes.
5009 // In the future, however, we might want to track the accumulated wait time and
5010 // adjust Millis accordingly if we encounter a spurious wakeup.
5011
5012 const int MAXTIMEOUT = 0x10000000;
5013 DWORD rv = WAIT_TIMEOUT;
5014 while (_Event < 0 && Millis > 0) {
5015 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5016 if (Millis > MAXTIMEOUT) {
5017 prd = MAXTIMEOUT;
5018 }
5019 rv = ::WaitForSingleObject(_ParkHandle, prd);
5020 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5021 if (rv == WAIT_TIMEOUT) {
5022 Millis -= prd;
5023 }
5024 }
5025 v = _Event;
5026 _Event = 0;
5027 // see comment at end of os::PlatformEvent::park() below:
5028 OrderAccess::fence();
5029 // If we encounter a nearly simultanous timeout expiry and unpark()
5030 // we return OS_OK indicating we awoke via unpark().
5031 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5032 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5033 }
5034
5035 void os::PlatformEvent::park() {
5036 // Transitions for _Event:
5037 // -1 => -1 : illegal
5038 // 1 => 0 : pass - return immediately
5039 // 0 => -1 : block; then set _Event to 0 before returning
5040
5041 guarantee(_ParkHandle != NULL, "Invariant");
5042 // Invariant: Only the thread associated with the Event/PlatformEvent
5043 // may call park().
5044 // Consider: use atomic decrement instead of CAS-loop
5045 int v;
5046 for (;;) {
5047 v = _Event;
5048 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5049 }
5050 guarantee((v == 0) || (v == 1), "invariant");
5051 if (v != 0) return;
5052
5053 // Do this the hard way by blocking ...
5054 // TODO: consider a brief spin here, gated on the success of recent
5055 // spin attempts by this thread.
5056 while (_Event < 0) {
5057 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5058 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5059 }
5060
5061 // Usually we'll find _Event == 0 at this point, but as
5062 // an optional optimization we clear it, just in case can
5063 // multiple unpark() operations drove _Event up to 1.
5064 _Event = 0;
5065 OrderAccess::fence();
5066 guarantee(_Event >= 0, "invariant");
5067 }
5068
5069 void os::PlatformEvent::unpark() {
5070 guarantee(_ParkHandle != NULL, "Invariant");
5071
5072 // Transitions for _Event:
5073 // 0 => 1 : just return
5074 // 1 => 1 : just return
5075 // -1 => either 0 or 1; must signal target thread
5076 // That is, we can safely transition _Event from -1 to either
5077 // 0 or 1.
5078 // See also: "Semaphores in Plan 9" by Mullender & Cox
5079 //
5080 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5081 // that it will take two back-to-back park() calls for the owning
5082 // thread to block. This has the benefit of forcing a spurious return
5083 // from the first park() call after an unpark() call which will help
5084 // shake out uses of park() and unpark() without condition variables.
5085
5086 if (Atomic::xchg(1, &_Event) >= 0) return;
5087
5088 ::SetEvent(_ParkHandle);
5089 }
5090
5091
5092 // JSR166
5093 // -------------------------------------------------------
5094
5095 // The Windows implementation of Park is very straightforward: Basic
5096 // operations on Win32 Events turn out to have the right semantics to
5097 // use them directly. We opportunistically resuse the event inherited
5098 // from Monitor.
5099
5100 void Parker::park(bool isAbsolute, jlong time) {
5101 guarantee(_ParkEvent != NULL, "invariant");
5102 // First, demultiplex/decode time arguments
5103 if (time < 0) { // don't wait
5104 return;
5105 } else if (time == 0 && !isAbsolute) {
5106 time = INFINITE;
5107 } else if (isAbsolute) {
5108 time -= os::javaTimeMillis(); // convert to relative time
5109 if (time <= 0) { // already elapsed
5110 return;
5111 }
5112 } else { // relative
5113 time /= 1000000; // Must coarsen from nanos to millis
5114 if (time == 0) { // Wait for the minimal time unit if zero
5115 time = 1;
5116 }
5117 }
5118
5119 JavaThread* thread = (JavaThread*)(Thread::current());
5120 assert(thread->is_Java_thread(), "Must be JavaThread");
5121 JavaThread *jt = (JavaThread *)thread;
5122
5123 // Don't wait if interrupted or already triggered
5124 if (Thread::is_interrupted(thread, false) ||
5125 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5126 ResetEvent(_ParkEvent);
5127 return;
5128 } else {
5129 ThreadBlockInVM tbivm(jt);
5130 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5131 jt->set_suspend_equivalent();
5132
5133 WaitForSingleObject(_ParkEvent, time);
5134 ResetEvent(_ParkEvent);
5135
5136 // If externally suspended while waiting, re-suspend
5137 if (jt->handle_special_suspend_equivalent_condition()) {
5138 jt->java_suspend_self();
5139 }
5140 }
5141 }
5142
5143 void Parker::unpark() {
5144 guarantee(_ParkEvent != NULL, "invariant");
5145 SetEvent(_ParkEvent);
5146 }
5147
5148 // Run the specified command in a separate process. Return its exit value,
5149 // or -1 on failure (e.g. can't create a new process).
5150 int os::fork_and_exec(char* cmd) {
5151 STARTUPINFO si;
5152 PROCESS_INFORMATION pi;
5153
5154 memset(&si, 0, sizeof(si));
5155 si.cb = sizeof(si);
5156 memset(&pi, 0, sizeof(pi));
5157 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5158 cmd, // command line
5159 NULL, // process security attribute
5160 NULL, // thread security attribute
5161 TRUE, // inherits system handles
5162 0, // no creation flags
5163 NULL, // use parent's environment block
5164 NULL, // use parent's starting directory
5165 &si, // (in) startup information
5166 &pi); // (out) process information
5167
5168 if (rslt) {
5169 // Wait until child process exits.
5170 WaitForSingleObject(pi.hProcess, INFINITE);
5171
5172 DWORD exit_code;
5173 GetExitCodeProcess(pi.hProcess, &exit_code);
5174
5175 // Close process and thread handles.
5176 CloseHandle(pi.hProcess);
5177 CloseHandle(pi.hThread);
5178
5179 return (int)exit_code;
5180 } else {
5181 return -1;
5182 }
5183 }
5184
5185 //--------------------------------------------------------------------------------------------------
5186 // Non-product code
5187
5188 static int mallocDebugIntervalCounter = 0;
5189 static int mallocDebugCounter = 0;
5190 bool os::check_heap(bool force) {
5191 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5192 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5193 // Note: HeapValidate executes two hardware breakpoints when it finds something
5194 // wrong; at these points, eax contains the address of the offending block (I think).
5195 // To get to the exlicit error message(s) below, just continue twice.
5196 HANDLE heap = GetProcessHeap();
5197
5198 // If we fail to lock the heap, then gflags.exe has been used
5199 // or some other special heap flag has been set that prevents
5200 // locking. We don't try to walk a heap we can't lock.
5201 if (HeapLock(heap) != 0) {
5202 PROCESS_HEAP_ENTRY phe;
5203 phe.lpData = NULL;
5204 while (HeapWalk(heap, &phe) != 0) {
5205 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5206 !HeapValidate(heap, 0, phe.lpData)) {
5207 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5208 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5209 fatal("corrupted C heap");
5210 }
5211 }
5212 DWORD err = GetLastError();
5213 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5214 fatal(err_msg("heap walk aborted with error %d", err));
5215 }
5216 HeapUnlock(heap);
5217 }
5218 mallocDebugIntervalCounter = 0;
5219 }
5220 return true;
5221 }
5222
5223
5224 bool os::find(address addr, outputStream* st) {
5225 // Nothing yet
5226 return false;
5227 }
5228
5229 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5230 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5231
5232 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5233 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5234 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5235 address addr = (address) exceptionRecord->ExceptionInformation[1];
5236
5237 if (os::is_memory_serialize_page(thread, addr)) {
5238 return EXCEPTION_CONTINUE_EXECUTION;
5239 }
5240 }
5241
5242 return EXCEPTION_CONTINUE_SEARCH;
5243 }
5244
5245 // We don't build a headless jre for Windows
5246 bool os::is_headless_jre() { return false; }
5247
5248 static jint initSock() {
5249 WSADATA wsadata;
5250
5251 if (!os::WinSock2Dll::WinSock2Available()) {
5252 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5253 ::GetLastError());
5254 return JNI_ERR;
5255 }
5256
5257 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5258 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5259 ::GetLastError());
5260 return JNI_ERR;
5261 }
5262 return JNI_OK;
5263 }
5264
5265 struct hostent* os::get_host_by_name(char* name) {
5266 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5267 }
5268
5269 int os::socket_close(int fd) {
5270 return ::closesocket(fd);
5271 }
5272
5273 int os::socket(int domain, int type, int protocol) {
5274 return ::socket(domain, type, protocol);
5275 }
5276
5277 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5278 return ::connect(fd, him, len);
5279 }
5280
5281 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5282 return ::recv(fd, buf, (int)nBytes, flags);
5283 }
5284
5285 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5286 return ::send(fd, buf, (int)nBytes, flags);
5287 }
5288
5289 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5290 return ::send(fd, buf, (int)nBytes, flags);
5291 }
5292
5293 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5294 #if defined(IA32)
5295 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5296 #elif defined (AMD64)
5297 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5298 #endif
5299
5300 // returns true if thread could be suspended,
5301 // false otherwise
5302 static bool do_suspend(HANDLE* h) {
5303 if (h != NULL) {
5304 if (SuspendThread(*h) != ~0) {
5305 return true;
5306 }
5307 }
5308 return false;
5309 }
5310
5311 // resume the thread
5312 // calling resume on an active thread is a no-op
5313 static void do_resume(HANDLE* h) {
5314 if (h != NULL) {
5315 ResumeThread(*h);
5316 }
5317 }
5318
5319 // retrieve a suspend/resume context capable handle
5320 // from the tid. Caller validates handle return value.
5321 void get_thread_handle_for_extended_context(HANDLE* h,
5322 OSThread::thread_id_t tid) {
5323 if (h != NULL) {
5324 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5325 }
5326 }
5327
5328 // Thread sampling implementation
5329 //
5330 void os::SuspendedThreadTask::internal_do_task() {
5331 CONTEXT ctxt;
5332 HANDLE h = NULL;
5333
5334 // get context capable handle for thread
5335 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5336
5337 // sanity
5338 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5339 return;
5340 }
5341
5342 // suspend the thread
5343 if (do_suspend(&h)) {
5344 ctxt.ContextFlags = sampling_context_flags;
5345 // get thread context
5346 GetThreadContext(h, &ctxt);
5347 SuspendedThreadTaskContext context(_thread, &ctxt);
5348 // pass context to Thread Sampling impl
5349 do_task(context);
5350 // resume thread
5351 do_resume(&h);
5352 }
5353
5354 // close handle
5355 CloseHandle(h);
5356 }
5357
5358
5359 // Kernel32 API
5360 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5361 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5362 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5363 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5364 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5365
5366 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5367 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5368 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5369 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5370 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5371
5372
5373 BOOL os::Kernel32Dll::initialized = FALSE;
5374 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5375 assert(initialized && _GetLargePageMinimum != NULL,
5376 "GetLargePageMinimumAvailable() not yet called");
5377 return _GetLargePageMinimum();
5378 }
5379
5380 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5381 if (!initialized) {
5382 initialize();
5383 }
5384 return _GetLargePageMinimum != NULL;
5385 }
5386
5387 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5388 if (!initialized) {
5389 initialize();
5390 }
5391 return _VirtualAllocExNuma != NULL;
5392 }
5393
5394 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5395 SIZE_T bytes, DWORD flags,
5396 DWORD prot, DWORD node) {
5397 assert(initialized && _VirtualAllocExNuma != NULL,
5398 "NUMACallsAvailable() not yet called");
5399
5400 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5401 }
5402
5403 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5404 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5405 "NUMACallsAvailable() not yet called");
5406
5407 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5408 }
5409
5410 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5411 PULONGLONG proc_mask) {
5412 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5413 "NUMACallsAvailable() not yet called");
5414
5415 return _GetNumaNodeProcessorMask(node, proc_mask);
5416 }
5417
5418 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5419 ULONG FrameToCapture,
5420 PVOID* BackTrace,
5421 PULONG BackTraceHash) {
5422 if (!initialized) {
5423 initialize();
5424 }
5425
5426 if (_RtlCaptureStackBackTrace != NULL) {
5427 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5428 BackTrace, BackTraceHash);
5429 } else {
5430 return 0;
5431 }
5432 }
5433
5434 void os::Kernel32Dll::initializeCommon() {
5435 if (!initialized) {
5436 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5437 assert(handle != NULL, "Just check");
5438 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5439 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5440 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5441 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5442 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5443 initialized = TRUE;
5444 }
5445 }
5446
5447
5448
5449 #ifndef JDK6_OR_EARLIER
5450
5451 void os::Kernel32Dll::initialize() {
5452 initializeCommon();
5453 }
5454
5455
5456 // Kernel32 API
5457 inline BOOL os::Kernel32Dll::SwitchToThread() {
5458 return ::SwitchToThread();
5459 }
5460
5461 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5462 return true;
5463 }
5464
5465 // Help tools
5466 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5467 return true;
5468 }
5469
5470 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5471 DWORD th32ProcessId) {
5472 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5473 }
5474
5475 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5476 LPMODULEENTRY32 lpme) {
5477 return ::Module32First(hSnapshot, lpme);
5478 }
5479
5480 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5481 LPMODULEENTRY32 lpme) {
5482 return ::Module32Next(hSnapshot, lpme);
5483 }
5484
5485 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5486 ::GetNativeSystemInfo(lpSystemInfo);
5487 }
5488
5489 // PSAPI API
5490 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5491 HMODULE *lpModule, DWORD cb,
5492 LPDWORD lpcbNeeded) {
5493 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5494 }
5495
5496 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5497 HMODULE hModule,
5498 LPTSTR lpFilename,
5499 DWORD nSize) {
5500 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5501 }
5502
5503 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5504 HMODULE hModule,
5505 LPMODULEINFO lpmodinfo,
5506 DWORD cb) {
5507 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5508 }
5509
5510 inline BOOL os::PSApiDll::PSApiAvailable() {
5511 return true;
5512 }
5513
5514
5515 // WinSock2 API
5516 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5517 LPWSADATA lpWSAData) {
5518 return ::WSAStartup(wVersionRequested, lpWSAData);
5519 }
5520
5521 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5522 return ::gethostbyname(name);
5523 }
5524
5525 inline BOOL os::WinSock2Dll::WinSock2Available() {
5526 return true;
5527 }
5528
5529 // Advapi API
5530 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5531 BOOL DisableAllPrivileges,
5532 PTOKEN_PRIVILEGES NewState,
5533 DWORD BufferLength,
5534 PTOKEN_PRIVILEGES PreviousState,
5535 PDWORD ReturnLength) {
5536 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5537 BufferLength, PreviousState, ReturnLength);
5538 }
5539
5540 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5541 DWORD DesiredAccess,
5542 PHANDLE TokenHandle) {
5543 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5544 }
5545
5546 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5547 LPCTSTR lpName,
5548 PLUID lpLuid) {
5549 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5550 }
5551
5552 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5553 return true;
5554 }
5555
5556 void* os::get_default_process_handle() {
5557 return (void*)GetModuleHandle(NULL);
5558 }
5559
5560 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5561 // which is used to find statically linked in agents.
5562 // Additionally for windows, takes into account __stdcall names.
5563 // Parameters:
5564 // sym_name: Symbol in library we are looking for
5565 // lib_name: Name of library to look in, NULL for shared libs.
5566 // is_absolute_path == true if lib_name is absolute path to agent
5567 // such as "C:/a/b/L.dll"
5568 // == false if only the base name of the library is passed in
5569 // such as "L"
5570 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5571 bool is_absolute_path) {
5572 char *agent_entry_name;
5573 size_t len;
5574 size_t name_len;
5575 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5576 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5577 const char *start;
5578
5579 if (lib_name != NULL) {
5580 len = name_len = strlen(lib_name);
5581 if (is_absolute_path) {
5582 // Need to strip path, prefix and suffix
5583 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5584 lib_name = ++start;
5585 } else {
5586 // Need to check for drive prefix
5587 if ((start = strchr(lib_name, ':')) != NULL) {
5588 lib_name = ++start;
5589 }
5590 }
5591 if (len <= (prefix_len + suffix_len)) {
5592 return NULL;
5593 }
5594 lib_name += prefix_len;
5595 name_len = strlen(lib_name) - suffix_len;
5596 }
5597 }
5598 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5599 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5600 if (agent_entry_name == NULL) {
5601 return NULL;
5602 }
5603 if (lib_name != NULL) {
5604 const char *p = strrchr(sym_name, '@');
5605 if (p != NULL && p != sym_name) {
5606 // sym_name == _Agent_OnLoad@XX
5607 strncpy(agent_entry_name, sym_name, (p - sym_name));
5608 agent_entry_name[(p-sym_name)] = '\0';
5609 // agent_entry_name == _Agent_OnLoad
5610 strcat(agent_entry_name, "_");
5611 strncat(agent_entry_name, lib_name, name_len);
5612 strcat(agent_entry_name, p);
5613 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5614 } else {
5615 strcpy(agent_entry_name, sym_name);
5616 strcat(agent_entry_name, "_");
5617 strncat(agent_entry_name, lib_name, name_len);
5618 }
5619 } else {
5620 strcpy(agent_entry_name, sym_name);
5621 }
5622 return agent_entry_name;
5623 }
5624
5625 #else
5626 // Kernel32 API
5627 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5628 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5629 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5630 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5631 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5632
5633 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5634 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5635 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5636 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5637 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5638
5639 void os::Kernel32Dll::initialize() {
5640 if (!initialized) {
5641 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5642 assert(handle != NULL, "Just check");
5643
5644 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5645 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5646 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5647 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5648 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5649 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5650 initializeCommon(); // resolve the functions that always need resolving
5651
5652 initialized = TRUE;
5653 }
5654 }
5655
5656 BOOL os::Kernel32Dll::SwitchToThread() {
5657 assert(initialized && _SwitchToThread != NULL,
5658 "SwitchToThreadAvailable() not yet called");
5659 return _SwitchToThread();
5660 }
5661
5662
5663 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5664 if (!initialized) {
5665 initialize();
5666 }
5667 return _SwitchToThread != NULL;
5668 }
5669
5670 // Help tools
5671 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5672 if (!initialized) {
5673 initialize();
5674 }
5675 return _CreateToolhelp32Snapshot != NULL &&
5676 _Module32First != NULL &&
5677 _Module32Next != NULL;
5678 }
5679
5680 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5681 DWORD th32ProcessId) {
5682 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5683 "HelpToolsAvailable() not yet called");
5684
5685 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5686 }
5687
5688 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5689 assert(initialized && _Module32First != NULL,
5690 "HelpToolsAvailable() not yet called");
5691
5692 return _Module32First(hSnapshot, lpme);
5693 }
5694
5695 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5696 LPMODULEENTRY32 lpme) {
5697 assert(initialized && _Module32Next != NULL,
5698 "HelpToolsAvailable() not yet called");
5699
5700 return _Module32Next(hSnapshot, lpme);
5701 }
5702
5703
5704 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5705 if (!initialized) {
5706 initialize();
5707 }
5708 return _GetNativeSystemInfo != NULL;
5709 }
5710
5711 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5712 assert(initialized && _GetNativeSystemInfo != NULL,
5713 "GetNativeSystemInfoAvailable() not yet called");
5714
5715 _GetNativeSystemInfo(lpSystemInfo);
5716 }
5717
5718 // PSAPI API
5719
5720
5721 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5722 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5723 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5724
5725 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5726 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5727 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5728 BOOL os::PSApiDll::initialized = FALSE;
5729
5730 void os::PSApiDll::initialize() {
5731 if (!initialized) {
5732 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5733 if (handle != NULL) {
5734 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5735 "EnumProcessModules");
5736 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5737 "GetModuleFileNameExA");
5738 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5739 "GetModuleInformation");
5740 }
5741 initialized = TRUE;
5742 }
5743 }
5744
5745
5746
5747 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5748 DWORD cb, LPDWORD lpcbNeeded) {
5749 assert(initialized && _EnumProcessModules != NULL,
5750 "PSApiAvailable() not yet called");
5751 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5752 }
5753
5754 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5755 LPTSTR lpFilename, DWORD nSize) {
5756 assert(initialized && _GetModuleFileNameEx != NULL,
5757 "PSApiAvailable() not yet called");
5758 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5759 }
5760
5761 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5762 LPMODULEINFO lpmodinfo, DWORD cb) {
5763 assert(initialized && _GetModuleInformation != NULL,
5764 "PSApiAvailable() not yet called");
5765 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5766 }
5767
5768 BOOL os::PSApiDll::PSApiAvailable() {
5769 if (!initialized) {
5770 initialize();
5771 }
5772 return _EnumProcessModules != NULL &&
5773 _GetModuleFileNameEx != NULL &&
5774 _GetModuleInformation != NULL;
5775 }
5776
5777
5778 // WinSock2 API
5779 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5780 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5781
5782 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5783 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5784 BOOL os::WinSock2Dll::initialized = FALSE;
5785
5786 void os::WinSock2Dll::initialize() {
5787 if (!initialized) {
5788 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5789 if (handle != NULL) {
5790 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5791 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5792 }
5793 initialized = TRUE;
5794 }
5795 }
5796
5797
5798 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5799 assert(initialized && _WSAStartup != NULL,
5800 "WinSock2Available() not yet called");
5801 return _WSAStartup(wVersionRequested, lpWSAData);
5802 }
5803
5804 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5805 assert(initialized && _gethostbyname != NULL,
5806 "WinSock2Available() not yet called");
5807 return _gethostbyname(name);
5808 }
5809
5810 BOOL os::WinSock2Dll::WinSock2Available() {
5811 if (!initialized) {
5812 initialize();
5813 }
5814 return _WSAStartup != NULL &&
5815 _gethostbyname != NULL;
5816 }
5817
5818 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5819 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5820 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5821
5822 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5823 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5824 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5825 BOOL os::Advapi32Dll::initialized = FALSE;
5826
5827 void os::Advapi32Dll::initialize() {
5828 if (!initialized) {
5829 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5830 if (handle != NULL) {
5831 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5832 "AdjustTokenPrivileges");
5833 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5834 "OpenProcessToken");
5835 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5836 "LookupPrivilegeValueA");
5837 }
5838 initialized = TRUE;
5839 }
5840 }
5841
5842 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5843 BOOL DisableAllPrivileges,
5844 PTOKEN_PRIVILEGES NewState,
5845 DWORD BufferLength,
5846 PTOKEN_PRIVILEGES PreviousState,
5847 PDWORD ReturnLength) {
5848 assert(initialized && _AdjustTokenPrivileges != NULL,
5849 "AdvapiAvailable() not yet called");
5850 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5851 BufferLength, PreviousState, ReturnLength);
5852 }
5853
5854 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5855 DWORD DesiredAccess,
5856 PHANDLE TokenHandle) {
5857 assert(initialized && _OpenProcessToken != NULL,
5858 "AdvapiAvailable() not yet called");
5859 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5860 }
5861
5862 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5863 LPCTSTR lpName, PLUID lpLuid) {
5864 assert(initialized && _LookupPrivilegeValue != NULL,
5865 "AdvapiAvailable() not yet called");
5866 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5867 }
5868
5869 BOOL os::Advapi32Dll::AdvapiAvailable() {
5870 if (!initialized) {
5871 initialize();
5872 }
5873 return _AdjustTokenPrivileges != NULL &&
5874 _OpenProcessToken != NULL &&
5875 _LookupPrivilegeValue != NULL;
5876 }
5877
5878 #endif
5879
5880 #ifndef PRODUCT
5881
5882 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5883 // contiguous memory block at a particular address.
5884 // The test first tries to find a good approximate address to allocate at by using the same
5885 // method to allocate some memory at any address. The test then tries to allocate memory in
5886 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5887 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5888 // the previously allocated memory is available for allocation. The only actual failure
5889 // that is reported is when the test tries to allocate at a particular location but gets a
5890 // different valid one. A NULL return value at this point is not considered an error but may
5891 // be legitimate.
5892 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5893 void TestReserveMemorySpecial_test() {
5894 if (!UseLargePages) {
5895 if (VerboseInternalVMTests) {
5896 gclog_or_tty->print("Skipping test because large pages are disabled");
5897 }
5898 return;
5899 }
5900 // save current value of globals
5901 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5902 bool old_use_numa_interleaving = UseNUMAInterleaving;
5903
5904 // set globals to make sure we hit the correct code path
5905 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5906
5907 // do an allocation at an address selected by the OS to get a good one.
5908 const size_t large_allocation_size = os::large_page_size() * 4;
5909 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5910 if (result == NULL) {
5911 if (VerboseInternalVMTests) {
5912 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5913 large_allocation_size);
5914 }
5915 } else {
5916 os::release_memory_special(result, large_allocation_size);
5917
5918 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5919 // we managed to get it once.
5920 const size_t expected_allocation_size = os::large_page_size();
5921 char* expected_location = result + os::large_page_size();
5922 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5923 if (actual_location == NULL) {
5924 if (VerboseInternalVMTests) {
5925 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5926 expected_location, large_allocation_size);
5927 }
5928 } else {
5929 // release memory
5930 os::release_memory_special(actual_location, expected_allocation_size);
5931 // only now check, after releasing any memory to avoid any leaks.
5932 assert(actual_location == expected_location,
5933 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5934 expected_location, expected_allocation_size, actual_location));
5935 }
5936 }
5937
5938 // restore globals
5939 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5940 UseNUMAInterleaving = old_use_numa_interleaving;
5941 }
5942 #endif // PRODUCT