1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/vmError.hpp"
74
75 #ifdef _DEBUG
76 #include <crtdbg.h>
77 #endif
78
79
80 #include <windows.h>
81 #include <sys/types.h>
82 #include <sys/stat.h>
83 #include <sys/timeb.h>
84 #include <objidl.h>
85 #include <shlobj.h>
86
87 #include <malloc.h>
88 #include <signal.h>
89 #include <direct.h>
90 #include <errno.h>
91 #include <fcntl.h>
92 #include <io.h>
93 #include <process.h> // For _beginthreadex(), _endthreadex()
94 #include <imagehlp.h> // For os::dll_address_to_function_name
95 // for enumerating dll libraries
96 #include <vdmdbg.h>
97
98 // for timer info max values which include all bits
99 #define ALL_64_BITS CONST64(-1)
100
101 // For DLL loading/load error detection
102 // Values of PE COFF
103 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
104 #define IMAGE_FILE_SIGNATURE_LENGTH 4
105
106 static HANDLE main_process;
107 static HANDLE main_thread;
108 static int main_thread_id;
109
110 static FILETIME process_creation_time;
111 static FILETIME process_exit_time;
112 static FILETIME process_user_time;
113 static FILETIME process_kernel_time;
114
115 #ifdef _M_IA64
116 #define __CPU__ ia64
117 #elif _M_AMD64
118 #define __CPU__ amd64
119 #else
120 #define __CPU__ i486
121 #endif
122
123 // save DLL module handle, used by GetModuleFileName
124
125 HINSTANCE vm_lib_handle;
126
127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
128 switch (reason) {
129 case DLL_PROCESS_ATTACH:
130 vm_lib_handle = hinst;
131 if (ForceTimeHighResolution) {
132 timeBeginPeriod(1L);
133 }
134 break;
135 case DLL_PROCESS_DETACH:
136 if (ForceTimeHighResolution) {
137 timeEndPeriod(1L);
138 }
139 break;
140 default:
141 break;
142 }
143 return true;
144 }
145
146 static inline double fileTimeAsDouble(FILETIME* time) {
147 const double high = (double) ((unsigned int) ~0);
148 const double split = 10000000.0;
149 double result = (time->dwLowDateTime / split) +
150 time->dwHighDateTime * (high/split);
151 return result;
152 }
153
154 // Implementation of os
155
156 bool os::unsetenv(const char* name) {
157 assert(name != NULL, "Null pointer");
158 return (SetEnvironmentVariable(name, NULL) == TRUE);
159 }
160
161 // No setuid programs under Windows.
162 bool os::have_special_privileges() {
163 return false;
164 }
165
166
167 // This method is a periodic task to check for misbehaving JNI applications
168 // under CheckJNI, we can add any periodic checks here.
169 // For Windows at the moment does nothing
170 void os::run_periodic_checks() {
171 return;
172 }
173
174 // previous UnhandledExceptionFilter, if there is one
175 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
176
177 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
178
179 void os::init_system_properties_values() {
180 // sysclasspath, java_home, dll_dir
181 {
182 char *home_path;
183 char *dll_path;
184 char *pslash;
185 char *bin = "\\bin";
186 char home_dir[MAX_PATH];
187 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
188
189 if (alt_home_dir != NULL) {
190 strcpy(home_dir, alt_home_dir);
191 } else {
192 os::jvm_path(home_dir, sizeof(home_dir));
193 // Found the full path to jvm.dll.
194 // Now cut the path to <java_home>/jre if we can.
195 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
196 pslash = strrchr(home_dir, '\\');
197 if (pslash != NULL) {
198 *pslash = '\0'; // get rid of \{client|server}
199 pslash = strrchr(home_dir, '\\');
200 if (pslash != NULL) {
201 *pslash = '\0'; // get rid of \bin
202 }
203 }
204 }
205
206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
207 if (home_path == NULL) {
208 return;
209 }
210 strcpy(home_path, home_dir);
211 Arguments::set_java_home(home_path);
212 FREE_C_HEAP_ARRAY(char, home_path);
213
214 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
215 mtInternal);
216 if (dll_path == NULL) {
217 return;
218 }
219 strcpy(dll_path, home_dir);
220 strcat(dll_path, bin);
221 Arguments::set_dll_dir(dll_path);
222 FREE_C_HEAP_ARRAY(char, dll_path);
223
224 if (!set_boot_path('\\', ';')) {
225 return;
226 }
227 }
228
229 // library_path
230 #define EXT_DIR "\\lib\\ext"
231 #define BIN_DIR "\\bin"
232 #define PACKAGE_DIR "\\Sun\\Java"
233 {
234 // Win32 library search order (See the documentation for LoadLibrary):
235 //
236 // 1. The directory from which application is loaded.
237 // 2. The system wide Java Extensions directory (Java only)
238 // 3. System directory (GetSystemDirectory)
239 // 4. Windows directory (GetWindowsDirectory)
240 // 5. The PATH environment variable
241 // 6. The current directory
242
243 char *library_path;
244 char tmp[MAX_PATH];
245 char *path_str = ::getenv("PATH");
246
247 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
248 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
249
250 library_path[0] = '\0';
251
252 GetModuleFileName(NULL, tmp, sizeof(tmp));
253 *(strrchr(tmp, '\\')) = '\0';
254 strcat(library_path, tmp);
255
256 GetWindowsDirectory(tmp, sizeof(tmp));
257 strcat(library_path, ";");
258 strcat(library_path, tmp);
259 strcat(library_path, PACKAGE_DIR BIN_DIR);
260
261 GetSystemDirectory(tmp, sizeof(tmp));
262 strcat(library_path, ";");
263 strcat(library_path, tmp);
264
265 GetWindowsDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 if (path_str) {
270 strcat(library_path, ";");
271 strcat(library_path, path_str);
272 }
273
274 strcat(library_path, ";.");
275
276 Arguments::set_library_path(library_path);
277 FREE_C_HEAP_ARRAY(char, library_path);
278 }
279
280 // Default extensions directory
281 {
282 char path[MAX_PATH];
283 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
284 GetWindowsDirectory(path, MAX_PATH);
285 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
286 path, PACKAGE_DIR, EXT_DIR);
287 Arguments::set_ext_dirs(buf);
288 }
289 #undef EXT_DIR
290 #undef BIN_DIR
291 #undef PACKAGE_DIR
292
293 #ifndef _WIN64
294 // set our UnhandledExceptionFilter and save any previous one
295 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
296 #endif
297
298 // Done
299 return;
300 }
301
302 void os::breakpoint() {
303 DebugBreak();
304 }
305
306 // Invoked from the BREAKPOINT Macro
307 extern "C" void breakpoint() {
308 os::breakpoint();
309 }
310
311 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
312 // So far, this method is only used by Native Memory Tracking, which is
313 // only supported on Windows XP or later.
314 //
315 int os::get_native_stack(address* stack, int frames, int toSkip) {
316 #ifdef _NMT_NOINLINE_
317 toSkip++;
318 #endif
319 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
320 (PVOID*)stack, NULL);
321 for (int index = captured; index < frames; index ++) {
322 stack[index] = NULL;
323 }
324 return captured;
325 }
326
327
328 // os::current_stack_base()
329 //
330 // Returns the base of the stack, which is the stack's
331 // starting address. This function must be called
332 // while running on the stack of the thread being queried.
333
334 address os::current_stack_base() {
335 MEMORY_BASIC_INFORMATION minfo;
336 address stack_bottom;
337 size_t stack_size;
338
339 VirtualQuery(&minfo, &minfo, sizeof(minfo));
340 stack_bottom = (address)minfo.AllocationBase;
341 stack_size = minfo.RegionSize;
342
343 // Add up the sizes of all the regions with the same
344 // AllocationBase.
345 while (1) {
346 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
347 if (stack_bottom == (address)minfo.AllocationBase) {
348 stack_size += minfo.RegionSize;
349 } else {
350 break;
351 }
352 }
353
354 #ifdef _M_IA64
355 // IA64 has memory and register stacks
356 //
357 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
358 // at thread creation (1MB backing store growing upwards, 1MB memory stack
359 // growing downwards, 2MB summed up)
360 //
361 // ...
362 // ------- top of stack (high address) -----
363 // |
364 // | 1MB
365 // | Backing Store (Register Stack)
366 // |
367 // | / \
368 // | |
369 // | |
370 // | |
371 // ------------------------ stack base -----
372 // | 1MB
373 // | Memory Stack
374 // |
375 // | |
376 // | |
377 // | |
378 // | \ /
379 // |
380 // ----- bottom of stack (low address) -----
381 // ...
382
383 stack_size = stack_size / 2;
384 #endif
385 return stack_bottom + stack_size;
386 }
387
388 size_t os::current_stack_size() {
389 size_t sz;
390 MEMORY_BASIC_INFORMATION minfo;
391 VirtualQuery(&minfo, &minfo, sizeof(minfo));
392 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
393 return sz;
394 }
395
396 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
397 const struct tm* time_struct_ptr = localtime(clock);
398 if (time_struct_ptr != NULL) {
399 *res = *time_struct_ptr;
400 return res;
401 }
402 return NULL;
403 }
404
405 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
406
407 // Thread start routine for all new Java threads
408 static unsigned __stdcall java_start(Thread* thread) {
409 // Try to randomize the cache line index of hot stack frames.
410 // This helps when threads of the same stack traces evict each other's
411 // cache lines. The threads can be either from the same JVM instance, or
412 // from different JVM instances. The benefit is especially true for
413 // processors with hyperthreading technology.
414 static int counter = 0;
415 int pid = os::current_process_id();
416 _alloca(((pid ^ counter++) & 7) * 128);
417
418 OSThread* osthr = thread->osthread();
419 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
420
421 if (UseNUMA) {
422 int lgrp_id = os::numa_get_group_id();
423 if (lgrp_id != -1) {
424 thread->set_lgrp_id(lgrp_id);
425 }
426 }
427
428 // Diagnostic code to investigate JDK-6573254
429 int res = 30115; // non-java thread
430 if (thread->is_Java_thread()) {
431 res = 20115; // java thread
432 }
433
434 // Install a win32 structured exception handler around every thread created
435 // by VM, so VM can generate error dump when an exception occurred in non-
436 // Java thread (e.g. VM thread).
437 __try {
438 thread->run();
439 } __except(topLevelExceptionFilter(
440 (_EXCEPTION_POINTERS*)_exception_info())) {
441 // Nothing to do.
442 }
443
444 // One less thread is executing
445 // When the VMThread gets here, the main thread may have already exited
446 // which frees the CodeHeap containing the Atomic::add code
447 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
448 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
449 }
450
451 // Thread must not return from exit_process_or_thread(), but if it does,
452 // let it proceed to exit normally
453 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
454 }
455
456 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
457 int thread_id) {
458 // Allocate the OSThread object
459 OSThread* osthread = new OSThread(NULL, NULL);
460 if (osthread == NULL) return NULL;
461
462 // Initialize support for Java interrupts
463 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
464 if (interrupt_event == NULL) {
465 delete osthread;
466 return NULL;
467 }
468 osthread->set_interrupt_event(interrupt_event);
469
470 // Store info on the Win32 thread into the OSThread
471 osthread->set_thread_handle(thread_handle);
472 osthread->set_thread_id(thread_id);
473
474 if (UseNUMA) {
475 int lgrp_id = os::numa_get_group_id();
476 if (lgrp_id != -1) {
477 thread->set_lgrp_id(lgrp_id);
478 }
479 }
480
481 // Initial thread state is INITIALIZED, not SUSPENDED
482 osthread->set_state(INITIALIZED);
483
484 return osthread;
485 }
486
487
488 bool os::create_attached_thread(JavaThread* thread) {
489 #ifdef ASSERT
490 thread->verify_not_published();
491 #endif
492 HANDLE thread_h;
493 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
494 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
495 fatal("DuplicateHandle failed\n");
496 }
497 OSThread* osthread = create_os_thread(thread, thread_h,
498 (int)current_thread_id());
499 if (osthread == NULL) {
500 return false;
501 }
502
503 // Initial thread state is RUNNABLE
504 osthread->set_state(RUNNABLE);
505
506 thread->set_osthread(osthread);
507 return true;
508 }
509
510 bool os::create_main_thread(JavaThread* thread) {
511 #ifdef ASSERT
512 thread->verify_not_published();
513 #endif
514 if (_starting_thread == NULL) {
515 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
516 if (_starting_thread == NULL) {
517 return false;
518 }
519 }
520
521 // The primordial thread is runnable from the start)
522 _starting_thread->set_state(RUNNABLE);
523
524 thread->set_osthread(_starting_thread);
525 return true;
526 }
527
528 // Allocate and initialize a new OSThread
529 bool os::create_thread(Thread* thread, ThreadType thr_type,
530 size_t stack_size) {
531 unsigned thread_id;
532
533 // Allocate the OSThread object
534 OSThread* osthread = new OSThread(NULL, NULL);
535 if (osthread == NULL) {
536 return false;
537 }
538
539 // Initialize support for Java interrupts
540 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
541 if (interrupt_event == NULL) {
542 delete osthread;
543 return NULL;
544 }
545 osthread->set_interrupt_event(interrupt_event);
546 osthread->set_interrupted(false);
547
548 thread->set_osthread(osthread);
549
550 if (stack_size == 0) {
551 switch (thr_type) {
552 case os::java_thread:
553 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
554 if (JavaThread::stack_size_at_create() > 0) {
555 stack_size = JavaThread::stack_size_at_create();
556 }
557 break;
558 case os::compiler_thread:
559 if (CompilerThreadStackSize > 0) {
560 stack_size = (size_t)(CompilerThreadStackSize * K);
561 break;
562 } // else fall through:
563 // use VMThreadStackSize if CompilerThreadStackSize is not defined
564 case os::vm_thread:
565 case os::pgc_thread:
566 case os::cgc_thread:
567 case os::watcher_thread:
568 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
569 break;
570 }
571 }
572
573 // Create the Win32 thread
574 //
575 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
576 // does not specify stack size. Instead, it specifies the size of
577 // initially committed space. The stack size is determined by
578 // PE header in the executable. If the committed "stack_size" is larger
579 // than default value in the PE header, the stack is rounded up to the
580 // nearest multiple of 1MB. For example if the launcher has default
581 // stack size of 320k, specifying any size less than 320k does not
582 // affect the actual stack size at all, it only affects the initial
583 // commitment. On the other hand, specifying 'stack_size' larger than
584 // default value may cause significant increase in memory usage, because
585 // not only the stack space will be rounded up to MB, but also the
586 // entire space is committed upfront.
587 //
588 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
589 // for CreateThread() that can treat 'stack_size' as stack size. However we
590 // are not supposed to call CreateThread() directly according to MSDN
591 // document because JVM uses C runtime library. The good news is that the
592 // flag appears to work with _beginthredex() as well.
593
594 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
595 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
596 #endif
597
598 HANDLE thread_handle =
599 (HANDLE)_beginthreadex(NULL,
600 (unsigned)stack_size,
601 (unsigned (__stdcall *)(void*)) java_start,
602 thread,
603 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
604 &thread_id);
605 if (thread_handle == NULL) {
606 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
607 // without the flag.
608 thread_handle =
609 (HANDLE)_beginthreadex(NULL,
610 (unsigned)stack_size,
611 (unsigned (__stdcall *)(void*)) java_start,
612 thread,
613 CREATE_SUSPENDED,
614 &thread_id);
615 }
616 if (thread_handle == NULL) {
617 // Need to clean up stuff we've allocated so far
618 CloseHandle(osthread->interrupt_event());
619 thread->set_osthread(NULL);
620 delete osthread;
621 return NULL;
622 }
623
624 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
625
626 // Store info on the Win32 thread into the OSThread
627 osthread->set_thread_handle(thread_handle);
628 osthread->set_thread_id(thread_id);
629
630 // Initial thread state is INITIALIZED, not SUSPENDED
631 osthread->set_state(INITIALIZED);
632
633 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
634 return true;
635 }
636
637
638 // Free Win32 resources related to the OSThread
639 void os::free_thread(OSThread* osthread) {
640 assert(osthread != NULL, "osthread not set");
641 CloseHandle(osthread->thread_handle());
642 CloseHandle(osthread->interrupt_event());
643 delete osthread;
644 }
645
646 static jlong first_filetime;
647 static jlong initial_performance_count;
648 static jlong performance_frequency;
649
650
651 jlong as_long(LARGE_INTEGER x) {
652 jlong result = 0; // initialization to avoid warning
653 set_high(&result, x.HighPart);
654 set_low(&result, x.LowPart);
655 return result;
656 }
657
658
659 jlong os::elapsed_counter() {
660 LARGE_INTEGER count;
661 if (win32::_has_performance_count) {
662 QueryPerformanceCounter(&count);
663 return as_long(count) - initial_performance_count;
664 } else {
665 FILETIME wt;
666 GetSystemTimeAsFileTime(&wt);
667 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
668 }
669 }
670
671
672 jlong os::elapsed_frequency() {
673 if (win32::_has_performance_count) {
674 return performance_frequency;
675 } else {
676 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
677 return 10000000;
678 }
679 }
680
681
682 julong os::available_memory() {
683 return win32::available_memory();
684 }
685
686 julong os::win32::available_memory() {
687 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
688 // value if total memory is larger than 4GB
689 MEMORYSTATUSEX ms;
690 ms.dwLength = sizeof(ms);
691 GlobalMemoryStatusEx(&ms);
692
693 return (julong)ms.ullAvailPhys;
694 }
695
696 julong os::physical_memory() {
697 return win32::physical_memory();
698 }
699
700 bool os::has_allocatable_memory_limit(julong* limit) {
701 MEMORYSTATUSEX ms;
702 ms.dwLength = sizeof(ms);
703 GlobalMemoryStatusEx(&ms);
704 #ifdef _LP64
705 *limit = (julong)ms.ullAvailVirtual;
706 return true;
707 #else
708 // Limit to 1400m because of the 2gb address space wall
709 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
710 return true;
711 #endif
712 }
713
714 // VC6 lacks DWORD_PTR
715 #if _MSC_VER < 1300
716 typedef UINT_PTR DWORD_PTR;
717 #endif
718
719 int os::active_processor_count() {
720 DWORD_PTR lpProcessAffinityMask = 0;
721 DWORD_PTR lpSystemAffinityMask = 0;
722 int proc_count = processor_count();
723 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
724 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
725 // Nof active processors is number of bits in process affinity mask
726 int bitcount = 0;
727 while (lpProcessAffinityMask != 0) {
728 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
729 bitcount++;
730 }
731 return bitcount;
732 } else {
733 return proc_count;
734 }
735 }
736
737 void os::set_native_thread_name(const char *name) {
738
739 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
740 //
741 // Note that unfortunately this only works if the process
742 // is already attached to a debugger; debugger must observe
743 // the exception below to show the correct name.
744
745 const DWORD MS_VC_EXCEPTION = 0x406D1388;
746 struct {
747 DWORD dwType; // must be 0x1000
748 LPCSTR szName; // pointer to name (in user addr space)
749 DWORD dwThreadID; // thread ID (-1=caller thread)
750 DWORD dwFlags; // reserved for future use, must be zero
751 } info;
752
753 info.dwType = 0x1000;
754 info.szName = name;
755 info.dwThreadID = -1;
756 info.dwFlags = 0;
757
758 __try {
759 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
760 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
761 }
762
763 bool os::distribute_processes(uint length, uint* distribution) {
764 // Not yet implemented.
765 return false;
766 }
767
768 bool os::bind_to_processor(uint processor_id) {
769 // Not yet implemented.
770 return false;
771 }
772
773 void os::win32::initialize_performance_counter() {
774 LARGE_INTEGER count;
775 if (QueryPerformanceFrequency(&count)) {
776 win32::_has_performance_count = 1;
777 performance_frequency = as_long(count);
778 QueryPerformanceCounter(&count);
779 initial_performance_count = as_long(count);
780 } else {
781 win32::_has_performance_count = 0;
782 FILETIME wt;
783 GetSystemTimeAsFileTime(&wt);
784 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
785 }
786 }
787
788
789 double os::elapsedTime() {
790 return (double) elapsed_counter() / (double) elapsed_frequency();
791 }
792
793
794 // Windows format:
795 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
796 // Java format:
797 // Java standards require the number of milliseconds since 1/1/1970
798
799 // Constant offset - calculated using offset()
800 static jlong _offset = 116444736000000000;
801 // Fake time counter for reproducible results when debugging
802 static jlong fake_time = 0;
803
804 #ifdef ASSERT
805 // Just to be safe, recalculate the offset in debug mode
806 static jlong _calculated_offset = 0;
807 static int _has_calculated_offset = 0;
808
809 jlong offset() {
810 if (_has_calculated_offset) return _calculated_offset;
811 SYSTEMTIME java_origin;
812 java_origin.wYear = 1970;
813 java_origin.wMonth = 1;
814 java_origin.wDayOfWeek = 0; // ignored
815 java_origin.wDay = 1;
816 java_origin.wHour = 0;
817 java_origin.wMinute = 0;
818 java_origin.wSecond = 0;
819 java_origin.wMilliseconds = 0;
820 FILETIME jot;
821 if (!SystemTimeToFileTime(&java_origin, &jot)) {
822 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
823 }
824 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
825 _has_calculated_offset = 1;
826 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
827 return _calculated_offset;
828 }
829 #else
830 jlong offset() {
831 return _offset;
832 }
833 #endif
834
835 jlong windows_to_java_time(FILETIME wt) {
836 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
837 return (a - offset()) / 10000;
838 }
839
840 // Returns time ticks in (10th of micro seconds)
841 jlong windows_to_time_ticks(FILETIME wt) {
842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
843 return (a - offset());
844 }
845
846 FILETIME java_to_windows_time(jlong l) {
847 jlong a = (l * 10000) + offset();
848 FILETIME result;
849 result.dwHighDateTime = high(a);
850 result.dwLowDateTime = low(a);
851 return result;
852 }
853
854 bool os::supports_vtime() { return true; }
855 bool os::enable_vtime() { return false; }
856 bool os::vtime_enabled() { return false; }
857
858 double os::elapsedVTime() {
859 FILETIME created;
860 FILETIME exited;
861 FILETIME kernel;
862 FILETIME user;
863 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
864 // the resolution of windows_to_java_time() should be sufficient (ms)
865 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
866 } else {
867 return elapsedTime();
868 }
869 }
870
871 jlong os::javaTimeMillis() {
872 if (UseFakeTimers) {
873 return fake_time++;
874 } else {
875 FILETIME wt;
876 GetSystemTimeAsFileTime(&wt);
877 return windows_to_java_time(wt);
878 }
879 }
880
881 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
882 FILETIME wt;
883 GetSystemTimeAsFileTime(&wt);
884 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
885 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
886 seconds = secs;
887 nanos = jlong(ticks - (secs*10000000)) * 100;
888 }
889
890 jlong os::javaTimeNanos() {
891 if (!win32::_has_performance_count) {
892 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
893 } else {
894 LARGE_INTEGER current_count;
895 QueryPerformanceCounter(¤t_count);
896 double current = as_long(current_count);
897 double freq = performance_frequency;
898 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
899 return time;
900 }
901 }
902
903 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
904 if (!win32::_has_performance_count) {
905 // javaTimeMillis() doesn't have much percision,
906 // but it is not going to wrap -- so all 64 bits
907 info_ptr->max_value = ALL_64_BITS;
908
909 // this is a wall clock timer, so may skip
910 info_ptr->may_skip_backward = true;
911 info_ptr->may_skip_forward = true;
912 } else {
913 jlong freq = performance_frequency;
914 if (freq < NANOSECS_PER_SEC) {
915 // the performance counter is 64 bits and we will
916 // be multiplying it -- so no wrap in 64 bits
917 info_ptr->max_value = ALL_64_BITS;
918 } else if (freq > NANOSECS_PER_SEC) {
919 // use the max value the counter can reach to
920 // determine the max value which could be returned
921 julong max_counter = (julong)ALL_64_BITS;
922 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
923 } else {
924 // the performance counter is 64 bits and we will
925 // be using it directly -- so no wrap in 64 bits
926 info_ptr->max_value = ALL_64_BITS;
927 }
928
929 // using a counter, so no skipping
930 info_ptr->may_skip_backward = false;
931 info_ptr->may_skip_forward = false;
932 }
933 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
934 }
935
936 char* os::local_time_string(char *buf, size_t buflen) {
937 SYSTEMTIME st;
938 GetLocalTime(&st);
939 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
940 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
941 return buf;
942 }
943
944 bool os::getTimesSecs(double* process_real_time,
945 double* process_user_time,
946 double* process_system_time) {
947 HANDLE h_process = GetCurrentProcess();
948 FILETIME create_time, exit_time, kernel_time, user_time;
949 BOOL result = GetProcessTimes(h_process,
950 &create_time,
951 &exit_time,
952 &kernel_time,
953 &user_time);
954 if (result != 0) {
955 FILETIME wt;
956 GetSystemTimeAsFileTime(&wt);
957 jlong rtc_millis = windows_to_java_time(wt);
958 jlong user_millis = windows_to_java_time(user_time);
959 jlong system_millis = windows_to_java_time(kernel_time);
960 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
961 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
962 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
963 return true;
964 } else {
965 return false;
966 }
967 }
968
969 void os::shutdown() {
970 // allow PerfMemory to attempt cleanup of any persistent resources
971 perfMemory_exit();
972
973 // flush buffered output, finish log files
974 ostream_abort();
975
976 // Check for abort hook
977 abort_hook_t abort_hook = Arguments::abort_hook();
978 if (abort_hook != NULL) {
979 abort_hook();
980 }
981 }
982
983
984 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
985 PMINIDUMP_EXCEPTION_INFORMATION,
986 PMINIDUMP_USER_STREAM_INFORMATION,
987 PMINIDUMP_CALLBACK_INFORMATION);
988
989 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
990 HINSTANCE dbghelp;
991 EXCEPTION_POINTERS ep;
992 MINIDUMP_EXCEPTION_INFORMATION mei;
993 MINIDUMP_EXCEPTION_INFORMATION* pmei;
994
995 HANDLE hProcess = GetCurrentProcess();
996 DWORD processId = GetCurrentProcessId();
997 HANDLE dumpFile;
998 MINIDUMP_TYPE dumpType;
999 static const char* cwd;
1000
1001 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
1002 #ifndef ASSERT
1003 // If running on a client version of Windows and user has not explicitly enabled dumping
1004 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
1005 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
1006 return;
1007 // If running on a server version of Windows and user has explictly disabled dumping
1008 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1009 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1010 return;
1011 }
1012 #else
1013 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1014 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1015 return;
1016 }
1017 #endif
1018
1019 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1020
1021 if (dbghelp == NULL) {
1022 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1023 return;
1024 }
1025
1026 _MiniDumpWriteDump =
1027 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1028 PMINIDUMP_EXCEPTION_INFORMATION,
1029 PMINIDUMP_USER_STREAM_INFORMATION,
1030 PMINIDUMP_CALLBACK_INFORMATION),
1031 GetProcAddress(dbghelp,
1032 "MiniDumpWriteDump"));
1033
1034 if (_MiniDumpWriteDump == NULL) {
1035 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1036 return;
1037 }
1038
1039 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1040
1041 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1042 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1043 #if API_VERSION_NUMBER >= 11
1044 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1045 MiniDumpWithUnloadedModules);
1046 #endif
1047
1048 cwd = get_current_directory(NULL, 0);
1049 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1050 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1051
1052 if (dumpFile == INVALID_HANDLE_VALUE) {
1053 VMError::report_coredump_status("Failed to create file for dumping", false);
1054 return;
1055 }
1056 if (exceptionRecord != NULL && contextRecord != NULL) {
1057 ep.ContextRecord = (PCONTEXT) contextRecord;
1058 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1059
1060 mei.ThreadId = GetCurrentThreadId();
1061 mei.ExceptionPointers = &ep;
1062 pmei = &mei;
1063 } else {
1064 pmei = NULL;
1065 }
1066
1067
1068 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1069 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1070 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1071 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1072 DWORD error = GetLastError();
1073 LPTSTR msgbuf = NULL;
1074
1075 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1076 FORMAT_MESSAGE_FROM_SYSTEM |
1077 FORMAT_MESSAGE_IGNORE_INSERTS,
1078 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1079
1080 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1081 LocalFree(msgbuf);
1082 } else {
1083 // Call to FormatMessage failed, just include the result from GetLastError
1084 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1085 }
1086 VMError::report_coredump_status(buffer, false);
1087 } else {
1088 VMError::report_coredump_status(buffer, true);
1089 }
1090
1091 CloseHandle(dumpFile);
1092 }
1093
1094
1095 void os::abort(bool dump_core) {
1096 os::shutdown();
1097 // no core dump on Windows
1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1099 }
1100
1101 // Die immediately, no exit hook, no abort hook, no cleanup.
1102 void os::die() {
1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1104 }
1105
1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1107 // * dirent_md.c 1.15 00/02/02
1108 //
1109 // The declarations for DIR and struct dirent are in jvm_win32.h.
1110
1111 // Caller must have already run dirname through JVM_NativePath, which removes
1112 // duplicate slashes and converts all instances of '/' into '\\'.
1113
1114 DIR * os::opendir(const char *dirname) {
1115 assert(dirname != NULL, "just checking"); // hotspot change
1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1117 DWORD fattr; // hotspot change
1118 char alt_dirname[4] = { 0, 0, 0, 0 };
1119
1120 if (dirp == 0) {
1121 errno = ENOMEM;
1122 return 0;
1123 }
1124
1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1126 // as a directory in FindFirstFile(). We detect this case here and
1127 // prepend the current drive name.
1128 //
1129 if (dirname[1] == '\0' && dirname[0] == '\\') {
1130 alt_dirname[0] = _getdrive() + 'A' - 1;
1131 alt_dirname[1] = ':';
1132 alt_dirname[2] = '\\';
1133 alt_dirname[3] = '\0';
1134 dirname = alt_dirname;
1135 }
1136
1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1138 if (dirp->path == 0) {
1139 free(dirp);
1140 errno = ENOMEM;
1141 return 0;
1142 }
1143 strcpy(dirp->path, dirname);
1144
1145 fattr = GetFileAttributes(dirp->path);
1146 if (fattr == 0xffffffff) {
1147 free(dirp->path);
1148 free(dirp);
1149 errno = ENOENT;
1150 return 0;
1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1152 free(dirp->path);
1153 free(dirp);
1154 errno = ENOTDIR;
1155 return 0;
1156 }
1157
1158 // Append "*.*", or possibly "\\*.*", to path
1159 if (dirp->path[1] == ':' &&
1160 (dirp->path[2] == '\0' ||
1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1162 // No '\\' needed for cases like "Z:" or "Z:\"
1163 strcat(dirp->path, "*.*");
1164 } else {
1165 strcat(dirp->path, "\\*.*");
1166 }
1167
1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1169 if (dirp->handle == INVALID_HANDLE_VALUE) {
1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1171 free(dirp->path);
1172 free(dirp);
1173 errno = EACCES;
1174 return 0;
1175 }
1176 }
1177 return dirp;
1178 }
1179
1180 // parameter dbuf unused on Windows
1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1182 assert(dirp != NULL, "just checking"); // hotspot change
1183 if (dirp->handle == INVALID_HANDLE_VALUE) {
1184 return 0;
1185 }
1186
1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1188
1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1190 if (GetLastError() == ERROR_INVALID_HANDLE) {
1191 errno = EBADF;
1192 return 0;
1193 }
1194 FindClose(dirp->handle);
1195 dirp->handle = INVALID_HANDLE_VALUE;
1196 }
1197
1198 return &dirp->dirent;
1199 }
1200
1201 int os::closedir(DIR *dirp) {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path);
1211 free(dirp);
1212 return 0;
1213 }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1220 return path_buf;
1221 } else {
1222 path_buf[0] = '\0';
1223 return path_buf;
1224 }
1225 }
1226
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1233
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1239
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1244
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0; i < n; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0; i < n; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i]);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1290
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1298
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll(address addr) {
1306 HMODULE hmod;
1307 MODULEINFO minfo;
1308
1309 hmod = GetModuleHandle("NTDLL.DLL");
1310 if (hmod == NULL) return false;
1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1312 &minfo, sizeof(MODULEINFO))) {
1313 return false;
1314 }
1315
1316 if ((addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1318 return true;
1319 } else {
1320 return false;
1321 }
1322 }
1323 #endif
1324
1325 struct _modinfo {
1326 address addr;
1327 char* full_path; // point to a char buffer
1328 int buflen; // size of the buffer
1329 address base_addr;
1330 };
1331
1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 struct _modinfo *pmod = (struct _modinfo *)param;
1335 if (!pmod) return -1;
1336
1337 if (base_addr <= pmod->addr &&
1338 top_address > pmod->addr) {
1339 // if a buffer is provided, copy path name to the buffer
1340 if (pmod->full_path) {
1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1342 }
1343 pmod->base_addr = base_addr;
1344 return 1;
1345 }
1346 return 0;
1347 }
1348
1349 bool os::dll_address_to_library_name(address addr, char* buf,
1350 int buflen, int* offset) {
1351 // buf is not optional, but offset is optional
1352 assert(buf != NULL, "sanity check");
1353
1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1355 // return the full path to the DLL file, sometimes it returns path
1356 // to the corresponding PDB file (debug info); sometimes it only
1357 // returns partial path, which makes life painful.
1358
1359 struct _modinfo mi;
1360 mi.addr = addr;
1361 mi.full_path = buf;
1362 mi.buflen = buflen;
1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1364 // buf already contains path name
1365 if (offset) *offset = addr - mi.base_addr;
1366 return true;
1367 }
1368
1369 buf[0] = '\0';
1370 if (offset) *offset = -1;
1371 return false;
1372 }
1373
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375 int buflen, int *offset) {
1376 // buf is not optional, but offset is optional
1377 assert(buf != NULL, "sanity check");
1378
1379 if (Decoder::decode(addr, buf, buflen, offset)) {
1380 return true;
1381 }
1382 if (offset != NULL) *offset = -1;
1383 buf[0] = '\0';
1384 return false;
1385 }
1386
1387 // save the start and end address of jvm.dll into param[0] and param[1]
1388 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1389 address top_address, void * param) {
1390 if (!param) return -1;
1391
1392 if (base_addr <= (address)_locate_jvm_dll &&
1393 top_address > (address)_locate_jvm_dll) {
1394 ((address*)param)[0] = base_addr;
1395 ((address*)param)[1] = top_address;
1396 return 1;
1397 }
1398 return 0;
1399 }
1400
1401 address vm_lib_location[2]; // start and end address of jvm.dll
1402
1403 // check if addr is inside jvm.dll
1404 bool os::address_is_in_vm(address addr) {
1405 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1406 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1407 assert(false, "Can't find jvm module.");
1408 return false;
1409 }
1410 }
1411
1412 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1413 }
1414
1415 // print module info; param is outputStream*
1416 static int _print_module(const char* fname, address base_address,
1417 address top_address, void* param) {
1418 if (!param) return -1;
1419
1420 outputStream* st = (outputStream*)param;
1421
1422 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1423 return 0;
1424 }
1425
1426 // Loads .dll/.so and
1427 // in case of error it checks if .dll/.so was built for the
1428 // same architecture as Hotspot is running on
1429 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1430 void * result = LoadLibrary(name);
1431 if (result != NULL) {
1432 return result;
1433 }
1434
1435 DWORD errcode = GetLastError();
1436 if (errcode == ERROR_MOD_NOT_FOUND) {
1437 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1438 ebuf[ebuflen - 1] = '\0';
1439 return NULL;
1440 }
1441
1442 // Parsing dll below
1443 // If we can read dll-info and find that dll was built
1444 // for an architecture other than Hotspot is running in
1445 // - then print to buffer "DLL was built for a different architecture"
1446 // else call os::lasterror to obtain system error message
1447
1448 // Read system error message into ebuf
1449 // It may or may not be overwritten below (in the for loop and just above)
1450 lasterror(ebuf, (size_t) ebuflen);
1451 ebuf[ebuflen - 1] = '\0';
1452 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1453 if (fd < 0) {
1454 return NULL;
1455 }
1456
1457 uint32_t signature_offset;
1458 uint16_t lib_arch = 0;
1459 bool failed_to_get_lib_arch =
1460 ( // Go to position 3c in the dll
1461 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1462 ||
1463 // Read location of signature
1464 (sizeof(signature_offset) !=
1465 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1466 ||
1467 // Go to COFF File Header in dll
1468 // that is located after "signature" (4 bytes long)
1469 (os::seek_to_file_offset(fd,
1470 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1471 ||
1472 // Read field that contains code of architecture
1473 // that dll was built for
1474 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1475 );
1476
1477 ::close(fd);
1478 if (failed_to_get_lib_arch) {
1479 // file i/o error - report os::lasterror(...) msg
1480 return NULL;
1481 }
1482
1483 typedef struct {
1484 uint16_t arch_code;
1485 char* arch_name;
1486 } arch_t;
1487
1488 static const arch_t arch_array[] = {
1489 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1490 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1491 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1492 };
1493 #if (defined _M_IA64)
1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1495 #elif (defined _M_AMD64)
1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1497 #elif (defined _M_IX86)
1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1499 #else
1500 #error Method os::dll_load requires that one of following \
1501 is defined :_M_IA64,_M_AMD64 or _M_IX86
1502 #endif
1503
1504
1505 // Obtain a string for printf operation
1506 // lib_arch_str shall contain string what platform this .dll was built for
1507 // running_arch_str shall string contain what platform Hotspot was built for
1508 char *running_arch_str = NULL, *lib_arch_str = NULL;
1509 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1510 if (lib_arch == arch_array[i].arch_code) {
1511 lib_arch_str = arch_array[i].arch_name;
1512 }
1513 if (running_arch == arch_array[i].arch_code) {
1514 running_arch_str = arch_array[i].arch_name;
1515 }
1516 }
1517
1518 assert(running_arch_str,
1519 "Didn't find running architecture code in arch_array");
1520
1521 // If the architecture is right
1522 // but some other error took place - report os::lasterror(...) msg
1523 if (lib_arch == running_arch) {
1524 return NULL;
1525 }
1526
1527 if (lib_arch_str != NULL) {
1528 ::_snprintf(ebuf, ebuflen - 1,
1529 "Can't load %s-bit .dll on a %s-bit platform",
1530 lib_arch_str, running_arch_str);
1531 } else {
1532 // don't know what architecture this dll was build for
1533 ::_snprintf(ebuf, ebuflen - 1,
1534 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1535 lib_arch, running_arch_str);
1536 }
1537
1538 return NULL;
1539 }
1540
1541 void os::print_dll_info(outputStream *st) {
1542 st->print_cr("Dynamic libraries:");
1543 get_loaded_modules_info(_print_module, (void *)st);
1544 }
1545
1546 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1547 HANDLE hProcess;
1548
1549 # define MAX_NUM_MODULES 128
1550 HMODULE modules[MAX_NUM_MODULES];
1551 static char filename[MAX_PATH];
1552 int result = 0;
1553
1554 if (!os::PSApiDll::PSApiAvailable()) {
1555 return 0;
1556 }
1557
1558 int pid = os::current_process_id();
1559 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1560 FALSE, pid);
1561 if (hProcess == NULL) return 0;
1562
1563 DWORD size_needed;
1564 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1565 sizeof(modules), &size_needed)) {
1566 CloseHandle(hProcess);
1567 return 0;
1568 }
1569
1570 // number of modules that are currently loaded
1571 int num_modules = size_needed / sizeof(HMODULE);
1572
1573 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1574 // Get Full pathname:
1575 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1576 filename, sizeof(filename))) {
1577 filename[0] = '\0';
1578 }
1579
1580 MODULEINFO modinfo;
1581 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1582 &modinfo, sizeof(modinfo))) {
1583 modinfo.lpBaseOfDll = NULL;
1584 modinfo.SizeOfImage = 0;
1585 }
1586
1587 // Invoke callback function
1588 result = callback(filename, (address)modinfo.lpBaseOfDll,
1589 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1590 if (result) break;
1591 }
1592
1593 CloseHandle(hProcess);
1594 return result;
1595 }
1596
1597 void os::print_os_info_brief(outputStream* st) {
1598 os::print_os_info(st);
1599 }
1600
1601 void os::print_os_info(outputStream* st) {
1602 #ifdef ASSERT
1603 char buffer[1024];
1604 DWORD size = sizeof(buffer);
1605 st->print(" HostName: ");
1606 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1607 st->print("%s", buffer);
1608 } else {
1609 st->print("N/A");
1610 }
1611 #endif
1612 st->print(" OS:");
1613 os::win32::print_windows_version(st);
1614 }
1615
1616 void os::win32::print_windows_version(outputStream* st) {
1617 OSVERSIONINFOEX osvi;
1618 VS_FIXEDFILEINFO *file_info;
1619 TCHAR kernel32_path[MAX_PATH];
1620 UINT len, ret;
1621
1622 // Use the GetVersionEx information to see if we're on a server or
1623 // workstation edition of Windows. Starting with Windows 8.1 we can't
1624 // trust the OS version information returned by this API.
1625 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1626 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1627 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1628 st->print_cr("Call to GetVersionEx failed");
1629 return;
1630 }
1631 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1632
1633 // Get the full path to \Windows\System32\kernel32.dll and use that for
1634 // determining what version of Windows we're running on.
1635 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1636 ret = GetSystemDirectory(kernel32_path, len);
1637 if (ret == 0 || ret > len) {
1638 st->print_cr("Call to GetSystemDirectory failed");
1639 return;
1640 }
1641 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1642
1643 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1644 if (version_size == 0) {
1645 st->print_cr("Call to GetFileVersionInfoSize failed");
1646 return;
1647 }
1648
1649 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1650 if (version_info == NULL) {
1651 st->print_cr("Failed to allocate version_info");
1652 return;
1653 }
1654
1655 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1656 os::free(version_info);
1657 st->print_cr("Call to GetFileVersionInfo failed");
1658 return;
1659 }
1660
1661 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1662 os::free(version_info);
1663 st->print_cr("Call to VerQueryValue failed");
1664 return;
1665 }
1666
1667 int major_version = HIWORD(file_info->dwProductVersionMS);
1668 int minor_version = LOWORD(file_info->dwProductVersionMS);
1669 int build_number = HIWORD(file_info->dwProductVersionLS);
1670 int build_minor = LOWORD(file_info->dwProductVersionLS);
1671 int os_vers = major_version * 1000 + minor_version;
1672 os::free(version_info);
1673
1674 st->print(" Windows ");
1675 switch (os_vers) {
1676
1677 case 6000:
1678 if (is_workstation) {
1679 st->print("Vista");
1680 } else {
1681 st->print("Server 2008");
1682 }
1683 break;
1684
1685 case 6001:
1686 if (is_workstation) {
1687 st->print("7");
1688 } else {
1689 st->print("Server 2008 R2");
1690 }
1691 break;
1692
1693 case 6002:
1694 if (is_workstation) {
1695 st->print("8");
1696 } else {
1697 st->print("Server 2012");
1698 }
1699 break;
1700
1701 case 6003:
1702 if (is_workstation) {
1703 st->print("8.1");
1704 } else {
1705 st->print("Server 2012 R2");
1706 }
1707 break;
1708
1709 case 10000:
1710 if (is_workstation) {
1711 st->print("10");
1712 } else {
1713 // The server version name of Windows 10 is not known at this time
1714 st->print("%d.%d", major_version, minor_version);
1715 }
1716 break;
1717
1718 default:
1719 // Unrecognized windows, print out its major and minor versions
1720 st->print("%d.%d", major_version, minor_version);
1721 break;
1722 }
1723
1724 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1725 // find out whether we are running on 64 bit processor or not
1726 SYSTEM_INFO si;
1727 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1728 os::Kernel32Dll::GetNativeSystemInfo(&si);
1729 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1730 st->print(" , 64 bit");
1731 }
1732
1733 st->print(" Build %d", build_number);
1734 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1735 st->cr();
1736 }
1737
1738 void os::pd_print_cpu_info(outputStream* st) {
1739 // Nothing to do for now.
1740 }
1741
1742 void os::print_memory_info(outputStream* st) {
1743 st->print("Memory:");
1744 st->print(" %dk page", os::vm_page_size()>>10);
1745
1746 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1747 // value if total memory is larger than 4GB
1748 MEMORYSTATUSEX ms;
1749 ms.dwLength = sizeof(ms);
1750 GlobalMemoryStatusEx(&ms);
1751
1752 st->print(", physical %uk", os::physical_memory() >> 10);
1753 st->print("(%uk free)", os::available_memory() >> 10);
1754
1755 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1756 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1757 st->cr();
1758 }
1759
1760 void os::print_siginfo(outputStream *st, void *siginfo) {
1761 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1762 st->print("siginfo:");
1763 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1764
1765 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1766 er->NumberParameters >= 2) {
1767 switch (er->ExceptionInformation[0]) {
1768 case 0: st->print(", reading address"); break;
1769 case 1: st->print(", writing address"); break;
1770 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1771 er->ExceptionInformation[0]);
1772 }
1773 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1774 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1775 er->NumberParameters >= 2 && UseSharedSpaces) {
1776 FileMapInfo* mapinfo = FileMapInfo::current_info();
1777 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1778 st->print("\n\nError accessing class data sharing archive." \
1779 " Mapped file inaccessible during execution, " \
1780 " possible disk/network problem.");
1781 }
1782 } else {
1783 int num = er->NumberParameters;
1784 if (num > 0) {
1785 st->print(", ExceptionInformation=");
1786 for (int i = 0; i < num; i++) {
1787 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1788 }
1789 }
1790 }
1791 st->cr();
1792 }
1793
1794 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1795 // do nothing
1796 }
1797
1798 static char saved_jvm_path[MAX_PATH] = {0};
1799
1800 // Find the full path to the current module, jvm.dll
1801 void os::jvm_path(char *buf, jint buflen) {
1802 // Error checking.
1803 if (buflen < MAX_PATH) {
1804 assert(false, "must use a large-enough buffer");
1805 buf[0] = '\0';
1806 return;
1807 }
1808 // Lazy resolve the path to current module.
1809 if (saved_jvm_path[0] != 0) {
1810 strcpy(buf, saved_jvm_path);
1811 return;
1812 }
1813
1814 buf[0] = '\0';
1815 if (Arguments::sun_java_launcher_is_altjvm()) {
1816 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1817 // for a JAVA_HOME environment variable and fix up the path so it
1818 // looks like jvm.dll is installed there (append a fake suffix
1819 // hotspot/jvm.dll).
1820 char* java_home_var = ::getenv("JAVA_HOME");
1821 if (java_home_var != NULL && java_home_var[0] != 0 &&
1822 strlen(java_home_var) < (size_t)buflen) {
1823 strncpy(buf, java_home_var, buflen);
1824
1825 // determine if this is a legacy image or modules image
1826 // modules image doesn't have "jre" subdirectory
1827 size_t len = strlen(buf);
1828 char* jrebin_p = buf + len;
1829 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1830 if (0 != _access(buf, 0)) {
1831 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1832 }
1833 len = strlen(buf);
1834 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1835 }
1836 }
1837
1838 if (buf[0] == '\0') {
1839 GetModuleFileName(vm_lib_handle, buf, buflen);
1840 }
1841 strncpy(saved_jvm_path, buf, MAX_PATH);
1842 saved_jvm_path[MAX_PATH - 1] = '\0';
1843 }
1844
1845
1846 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1847 #ifndef _WIN64
1848 st->print("_");
1849 #endif
1850 }
1851
1852
1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1854 #ifndef _WIN64
1855 st->print("@%d", args_size * sizeof(int));
1856 #endif
1857 }
1858
1859 // This method is a copy of JDK's sysGetLastErrorString
1860 // from src/windows/hpi/src/system_md.c
1861
1862 size_t os::lasterror(char* buf, size_t len) {
1863 DWORD errval;
1864
1865 if ((errval = GetLastError()) != 0) {
1866 // DOS error
1867 size_t n = (size_t)FormatMessage(
1868 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1869 NULL,
1870 errval,
1871 0,
1872 buf,
1873 (DWORD)len,
1874 NULL);
1875 if (n > 3) {
1876 // Drop final '.', CR, LF
1877 if (buf[n - 1] == '\n') n--;
1878 if (buf[n - 1] == '\r') n--;
1879 if (buf[n - 1] == '.') n--;
1880 buf[n] = '\0';
1881 }
1882 return n;
1883 }
1884
1885 if (errno != 0) {
1886 // C runtime error that has no corresponding DOS error code
1887 const char* s = strerror(errno);
1888 size_t n = strlen(s);
1889 if (n >= len) n = len - 1;
1890 strncpy(buf, s, n);
1891 buf[n] = '\0';
1892 return n;
1893 }
1894
1895 return 0;
1896 }
1897
1898 int os::get_last_error() {
1899 DWORD error = GetLastError();
1900 if (error == 0) {
1901 error = errno;
1902 }
1903 return (int)error;
1904 }
1905
1906 // sun.misc.Signal
1907 // NOTE that this is a workaround for an apparent kernel bug where if
1908 // a signal handler for SIGBREAK is installed then that signal handler
1909 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1910 // See bug 4416763.
1911 static void (*sigbreakHandler)(int) = NULL;
1912
1913 static void UserHandler(int sig, void *siginfo, void *context) {
1914 os::signal_notify(sig);
1915 // We need to reinstate the signal handler each time...
1916 os::signal(sig, (void*)UserHandler);
1917 }
1918
1919 void* os::user_handler() {
1920 return (void*) UserHandler;
1921 }
1922
1923 void* os::signal(int signal_number, void* handler) {
1924 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1925 void (*oldHandler)(int) = sigbreakHandler;
1926 sigbreakHandler = (void (*)(int)) handler;
1927 return (void*) oldHandler;
1928 } else {
1929 return (void*)::signal(signal_number, (void (*)(int))handler);
1930 }
1931 }
1932
1933 void os::signal_raise(int signal_number) {
1934 raise(signal_number);
1935 }
1936
1937 // The Win32 C runtime library maps all console control events other than ^C
1938 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1939 // logoff, and shutdown events. We therefore install our own console handler
1940 // that raises SIGTERM for the latter cases.
1941 //
1942 static BOOL WINAPI consoleHandler(DWORD event) {
1943 switch (event) {
1944 case CTRL_C_EVENT:
1945 if (is_error_reported()) {
1946 // Ctrl-C is pressed during error reporting, likely because the error
1947 // handler fails to abort. Let VM die immediately.
1948 os::die();
1949 }
1950
1951 os::signal_raise(SIGINT);
1952 return TRUE;
1953 break;
1954 case CTRL_BREAK_EVENT:
1955 if (sigbreakHandler != NULL) {
1956 (*sigbreakHandler)(SIGBREAK);
1957 }
1958 return TRUE;
1959 break;
1960 case CTRL_LOGOFF_EVENT: {
1961 // Don't terminate JVM if it is running in a non-interactive session,
1962 // such as a service process.
1963 USEROBJECTFLAGS flags;
1964 HANDLE handle = GetProcessWindowStation();
1965 if (handle != NULL &&
1966 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1967 sizeof(USEROBJECTFLAGS), NULL)) {
1968 // If it is a non-interactive session, let next handler to deal
1969 // with it.
1970 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1971 return FALSE;
1972 }
1973 }
1974 }
1975 case CTRL_CLOSE_EVENT:
1976 case CTRL_SHUTDOWN_EVENT:
1977 os::signal_raise(SIGTERM);
1978 return TRUE;
1979 break;
1980 default:
1981 break;
1982 }
1983 return FALSE;
1984 }
1985
1986 // The following code is moved from os.cpp for making this
1987 // code platform specific, which it is by its very nature.
1988
1989 // Return maximum OS signal used + 1 for internal use only
1990 // Used as exit signal for signal_thread
1991 int os::sigexitnum_pd() {
1992 return NSIG;
1993 }
1994
1995 // a counter for each possible signal value, including signal_thread exit signal
1996 static volatile jint pending_signals[NSIG+1] = { 0 };
1997 static HANDLE sig_sem = NULL;
1998
1999 void os::signal_init_pd() {
2000 // Initialize signal structures
2001 memset((void*)pending_signals, 0, sizeof(pending_signals));
2002
2003 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2004
2005 // Programs embedding the VM do not want it to attempt to receive
2006 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2007 // shutdown hooks mechanism introduced in 1.3. For example, when
2008 // the VM is run as part of a Windows NT service (i.e., a servlet
2009 // engine in a web server), the correct behavior is for any console
2010 // control handler to return FALSE, not TRUE, because the OS's
2011 // "final" handler for such events allows the process to continue if
2012 // it is a service (while terminating it if it is not a service).
2013 // To make this behavior uniform and the mechanism simpler, we
2014 // completely disable the VM's usage of these console events if -Xrs
2015 // (=ReduceSignalUsage) is specified. This means, for example, that
2016 // the CTRL-BREAK thread dump mechanism is also disabled in this
2017 // case. See bugs 4323062, 4345157, and related bugs.
2018
2019 if (!ReduceSignalUsage) {
2020 // Add a CTRL-C handler
2021 SetConsoleCtrlHandler(consoleHandler, TRUE);
2022 }
2023 }
2024
2025 void os::signal_notify(int signal_number) {
2026 BOOL ret;
2027 if (sig_sem != NULL) {
2028 Atomic::inc(&pending_signals[signal_number]);
2029 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2030 assert(ret != 0, "ReleaseSemaphore() failed");
2031 }
2032 }
2033
2034 static int check_pending_signals(bool wait_for_signal) {
2035 DWORD ret;
2036 while (true) {
2037 for (int i = 0; i < NSIG + 1; i++) {
2038 jint n = pending_signals[i];
2039 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2040 return i;
2041 }
2042 }
2043 if (!wait_for_signal) {
2044 return -1;
2045 }
2046
2047 JavaThread *thread = JavaThread::current();
2048
2049 ThreadBlockInVM tbivm(thread);
2050
2051 bool threadIsSuspended;
2052 do {
2053 thread->set_suspend_equivalent();
2054 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2055 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2056 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2057
2058 // were we externally suspended while we were waiting?
2059 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2060 if (threadIsSuspended) {
2061 // The semaphore has been incremented, but while we were waiting
2062 // another thread suspended us. We don't want to continue running
2063 // while suspended because that would surprise the thread that
2064 // suspended us.
2065 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2066 assert(ret != 0, "ReleaseSemaphore() failed");
2067
2068 thread->java_suspend_self();
2069 }
2070 } while (threadIsSuspended);
2071 }
2072 }
2073
2074 int os::signal_lookup() {
2075 return check_pending_signals(false);
2076 }
2077
2078 int os::signal_wait() {
2079 return check_pending_signals(true);
2080 }
2081
2082 // Implicit OS exception handling
2083
2084 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2085 address handler) {
2086 JavaThread* thread = JavaThread::current();
2087 // Save pc in thread
2088 #ifdef _M_IA64
2089 // Do not blow up if no thread info available.
2090 if (thread) {
2091 // Saving PRECISE pc (with slot information) in thread.
2092 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2093 // Convert precise PC into "Unix" format
2094 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2095 thread->set_saved_exception_pc((address)precise_pc);
2096 }
2097 // Set pc to handler
2098 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2099 // Clear out psr.ri (= Restart Instruction) in order to continue
2100 // at the beginning of the target bundle.
2101 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2102 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2103 #elif _M_AMD64
2104 // Do not blow up if no thread info available.
2105 if (thread) {
2106 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2107 }
2108 // Set pc to handler
2109 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2110 #else
2111 // Do not blow up if no thread info available.
2112 if (thread) {
2113 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2114 }
2115 // Set pc to handler
2116 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2117 #endif
2118
2119 // Continue the execution
2120 return EXCEPTION_CONTINUE_EXECUTION;
2121 }
2122
2123
2124 // Used for PostMortemDump
2125 extern "C" void safepoints();
2126 extern "C" void find(int x);
2127 extern "C" void events();
2128
2129 // According to Windows API documentation, an illegal instruction sequence should generate
2130 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2131 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2132 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2133
2134 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2135
2136 // From "Execution Protection in the Windows Operating System" draft 0.35
2137 // Once a system header becomes available, the "real" define should be
2138 // included or copied here.
2139 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2140
2141 // Handle NAT Bit consumption on IA64.
2142 #ifdef _M_IA64
2143 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2144 #endif
2145
2146 // Windows Vista/2008 heap corruption check
2147 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2148
2149 #define def_excpt(val) #val, val
2150
2151 struct siglabel {
2152 char *name;
2153 int number;
2154 };
2155
2156 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2157 // C++ compiler contain this error code. Because this is a compiler-generated
2158 // error, the code is not listed in the Win32 API header files.
2159 // The code is actually a cryptic mnemonic device, with the initial "E"
2160 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2161 // ASCII values of "msc".
2162
2163 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2164
2165
2166 struct siglabel exceptlabels[] = {
2167 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2168 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2169 def_excpt(EXCEPTION_BREAKPOINT),
2170 def_excpt(EXCEPTION_SINGLE_STEP),
2171 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2172 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2173 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2174 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2175 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2176 def_excpt(EXCEPTION_FLT_OVERFLOW),
2177 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2178 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2179 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2180 def_excpt(EXCEPTION_INT_OVERFLOW),
2181 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2182 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2183 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2185 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2186 def_excpt(EXCEPTION_STACK_OVERFLOW),
2187 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2188 def_excpt(EXCEPTION_GUARD_PAGE),
2189 def_excpt(EXCEPTION_INVALID_HANDLE),
2190 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2191 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2192 #ifdef _M_IA64
2193 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2194 #endif
2195 NULL, 0
2196 };
2197
2198 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2199 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2200 if (exceptlabels[i].number == exception_code) {
2201 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2202 return buf;
2203 }
2204 }
2205
2206 return NULL;
2207 }
2208
2209 //-----------------------------------------------------------------------------
2210 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2211 // handle exception caused by idiv; should only happen for -MinInt/-1
2212 // (division by zero is handled explicitly)
2213 #ifdef _M_IA64
2214 assert(0, "Fix Handle_IDiv_Exception");
2215 #elif _M_AMD64
2216 PCONTEXT ctx = exceptionInfo->ContextRecord;
2217 address pc = (address)ctx->Rip;
2218 assert(pc[0] == 0xF7, "not an idiv opcode");
2219 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2220 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2221 // set correct result values and continue after idiv instruction
2222 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2223 ctx->Rax = (DWORD)min_jint; // result
2224 ctx->Rdx = (DWORD)0; // remainder
2225 // Continue the execution
2226 #else
2227 PCONTEXT ctx = exceptionInfo->ContextRecord;
2228 address pc = (address)ctx->Eip;
2229 assert(pc[0] == 0xF7, "not an idiv opcode");
2230 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2231 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2232 // set correct result values and continue after idiv instruction
2233 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2234 ctx->Eax = (DWORD)min_jint; // result
2235 ctx->Edx = (DWORD)0; // remainder
2236 // Continue the execution
2237 #endif
2238 return EXCEPTION_CONTINUE_EXECUTION;
2239 }
2240
2241 //-----------------------------------------------------------------------------
2242 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2243 PCONTEXT ctx = exceptionInfo->ContextRecord;
2244 #ifndef _WIN64
2245 // handle exception caused by native method modifying control word
2246 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2247
2248 switch (exception_code) {
2249 case EXCEPTION_FLT_DENORMAL_OPERAND:
2250 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2251 case EXCEPTION_FLT_INEXACT_RESULT:
2252 case EXCEPTION_FLT_INVALID_OPERATION:
2253 case EXCEPTION_FLT_OVERFLOW:
2254 case EXCEPTION_FLT_STACK_CHECK:
2255 case EXCEPTION_FLT_UNDERFLOW:
2256 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2257 if (fp_control_word != ctx->FloatSave.ControlWord) {
2258 // Restore FPCW and mask out FLT exceptions
2259 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2260 // Mask out pending FLT exceptions
2261 ctx->FloatSave.StatusWord &= 0xffffff00;
2262 return EXCEPTION_CONTINUE_EXECUTION;
2263 }
2264 }
2265
2266 if (prev_uef_handler != NULL) {
2267 // We didn't handle this exception so pass it to the previous
2268 // UnhandledExceptionFilter.
2269 return (prev_uef_handler)(exceptionInfo);
2270 }
2271 #else // !_WIN64
2272 // On Windows, the mxcsr control bits are non-volatile across calls
2273 // See also CR 6192333
2274 //
2275 jint MxCsr = INITIAL_MXCSR;
2276 // we can't use StubRoutines::addr_mxcsr_std()
2277 // because in Win64 mxcsr is not saved there
2278 if (MxCsr != ctx->MxCsr) {
2279 ctx->MxCsr = MxCsr;
2280 return EXCEPTION_CONTINUE_EXECUTION;
2281 }
2282 #endif // !_WIN64
2283
2284 return EXCEPTION_CONTINUE_SEARCH;
2285 }
2286
2287 static inline void report_error(Thread* t, DWORD exception_code,
2288 address addr, void* siginfo, void* context) {
2289 VMError err(t, exception_code, addr, siginfo, context);
2290 err.report_and_die();
2291
2292 // If UseOsErrorReporting, this will return here and save the error file
2293 // somewhere where we can find it in the minidump.
2294 }
2295
2296 //-----------------------------------------------------------------------------
2297 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2298 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2299 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2300 #ifdef _M_IA64
2301 // On Itanium, we need the "precise pc", which has the slot number coded
2302 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2303 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2304 // Convert the pc to "Unix format", which has the slot number coded
2305 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2306 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2307 // information is saved in the Unix format.
2308 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2309 #elif _M_AMD64
2310 address pc = (address) exceptionInfo->ContextRecord->Rip;
2311 #else
2312 address pc = (address) exceptionInfo->ContextRecord->Eip;
2313 #endif
2314 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2315
2316 // Handle SafeFetch32 and SafeFetchN exceptions.
2317 if (StubRoutines::is_safefetch_fault(pc)) {
2318 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2319 }
2320
2321 #ifndef _WIN64
2322 // Execution protection violation - win32 running on AMD64 only
2323 // Handled first to avoid misdiagnosis as a "normal" access violation;
2324 // This is safe to do because we have a new/unique ExceptionInformation
2325 // code for this condition.
2326 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2327 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2328 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2329 address addr = (address) exceptionRecord->ExceptionInformation[1];
2330
2331 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2332 int page_size = os::vm_page_size();
2333
2334 // Make sure the pc and the faulting address are sane.
2335 //
2336 // If an instruction spans a page boundary, and the page containing
2337 // the beginning of the instruction is executable but the following
2338 // page is not, the pc and the faulting address might be slightly
2339 // different - we still want to unguard the 2nd page in this case.
2340 //
2341 // 15 bytes seems to be a (very) safe value for max instruction size.
2342 bool pc_is_near_addr =
2343 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2344 bool instr_spans_page_boundary =
2345 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2346 (intptr_t) page_size) > 0);
2347
2348 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2349 static volatile address last_addr =
2350 (address) os::non_memory_address_word();
2351
2352 // In conservative mode, don't unguard unless the address is in the VM
2353 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2354 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2355
2356 // Set memory to RWX and retry
2357 address page_start =
2358 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2359 bool res = os::protect_memory((char*) page_start, page_size,
2360 os::MEM_PROT_RWX);
2361
2362 if (PrintMiscellaneous && Verbose) {
2363 char buf[256];
2364 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2365 "at " INTPTR_FORMAT
2366 ", unguarding " INTPTR_FORMAT ": %s", addr,
2367 page_start, (res ? "success" : strerror(errno)));
2368 tty->print_raw_cr(buf);
2369 }
2370
2371 // Set last_addr so if we fault again at the same address, we don't
2372 // end up in an endless loop.
2373 //
2374 // There are two potential complications here. Two threads trapping
2375 // at the same address at the same time could cause one of the
2376 // threads to think it already unguarded, and abort the VM. Likely
2377 // very rare.
2378 //
2379 // The other race involves two threads alternately trapping at
2380 // different addresses and failing to unguard the page, resulting in
2381 // an endless loop. This condition is probably even more unlikely
2382 // than the first.
2383 //
2384 // Although both cases could be avoided by using locks or thread
2385 // local last_addr, these solutions are unnecessary complication:
2386 // this handler is a best-effort safety net, not a complete solution.
2387 // It is disabled by default and should only be used as a workaround
2388 // in case we missed any no-execute-unsafe VM code.
2389
2390 last_addr = addr;
2391
2392 return EXCEPTION_CONTINUE_EXECUTION;
2393 }
2394 }
2395
2396 // Last unguard failed or not unguarding
2397 tty->print_raw_cr("Execution protection violation");
2398 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2399 exceptionInfo->ContextRecord);
2400 return EXCEPTION_CONTINUE_SEARCH;
2401 }
2402 }
2403 #endif // _WIN64
2404
2405 // Check to see if we caught the safepoint code in the
2406 // process of write protecting the memory serialization page.
2407 // It write enables the page immediately after protecting it
2408 // so just return.
2409 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2410 JavaThread* thread = (JavaThread*) t;
2411 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2412 address addr = (address) exceptionRecord->ExceptionInformation[1];
2413 if (os::is_memory_serialize_page(thread, addr)) {
2414 // Block current thread until the memory serialize page permission restored.
2415 os::block_on_serialize_page_trap();
2416 return EXCEPTION_CONTINUE_EXECUTION;
2417 }
2418 }
2419
2420 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2421 VM_Version::is_cpuinfo_segv_addr(pc)) {
2422 // Verify that OS save/restore AVX registers.
2423 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2424 }
2425
2426 if (t != NULL && t->is_Java_thread()) {
2427 JavaThread* thread = (JavaThread*) t;
2428 bool in_java = thread->thread_state() == _thread_in_Java;
2429
2430 // Handle potential stack overflows up front.
2431 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2432 if (os::uses_stack_guard_pages()) {
2433 #ifdef _M_IA64
2434 // Use guard page for register stack.
2435 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2436 address addr = (address) exceptionRecord->ExceptionInformation[1];
2437 // Check for a register stack overflow on Itanium
2438 if (thread->addr_inside_register_stack_red_zone(addr)) {
2439 // Fatal red zone violation happens if the Java program
2440 // catches a StackOverflow error and does so much processing
2441 // that it runs beyond the unprotected yellow guard zone. As
2442 // a result, we are out of here.
2443 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2444 } else if(thread->addr_inside_register_stack(addr)) {
2445 // Disable the yellow zone which sets the state that
2446 // we've got a stack overflow problem.
2447 if (thread->stack_yellow_zone_enabled()) {
2448 thread->disable_stack_yellow_zone();
2449 }
2450 // Give us some room to process the exception.
2451 thread->disable_register_stack_guard();
2452 // Tracing with +Verbose.
2453 if (Verbose) {
2454 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2455 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2456 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2457 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2458 thread->register_stack_base(),
2459 thread->register_stack_base() + thread->stack_size());
2460 }
2461
2462 // Reguard the permanent register stack red zone just to be sure.
2463 // We saw Windows silently disabling this without telling us.
2464 thread->enable_register_stack_red_zone();
2465
2466 return Handle_Exception(exceptionInfo,
2467 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2468 }
2469 #endif
2470 if (thread->stack_yellow_zone_enabled()) {
2471 // Yellow zone violation. The o/s has unprotected the first yellow
2472 // zone page for us. Note: must call disable_stack_yellow_zone to
2473 // update the enabled status, even if the zone contains only one page.
2474 thread->disable_stack_yellow_zone();
2475 // If not in java code, return and hope for the best.
2476 return in_java
2477 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2478 : EXCEPTION_CONTINUE_EXECUTION;
2479 } else {
2480 // Fatal red zone violation.
2481 thread->disable_stack_red_zone();
2482 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2483 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2484 exceptionInfo->ContextRecord);
2485 return EXCEPTION_CONTINUE_SEARCH;
2486 }
2487 } else if (in_java) {
2488 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2489 // a one-time-only guard page, which it has released to us. The next
2490 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2491 return Handle_Exception(exceptionInfo,
2492 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2493 } else {
2494 // Can only return and hope for the best. Further stack growth will
2495 // result in an ACCESS_VIOLATION.
2496 return EXCEPTION_CONTINUE_EXECUTION;
2497 }
2498 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2499 // Either stack overflow or null pointer exception.
2500 if (in_java) {
2501 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2502 address addr = (address) exceptionRecord->ExceptionInformation[1];
2503 address stack_end = thread->stack_base() - thread->stack_size();
2504 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2505 // Stack overflow.
2506 assert(!os::uses_stack_guard_pages(),
2507 "should be caught by red zone code above.");
2508 return Handle_Exception(exceptionInfo,
2509 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2510 }
2511 // Check for safepoint polling and implicit null
2512 // We only expect null pointers in the stubs (vtable)
2513 // the rest are checked explicitly now.
2514 CodeBlob* cb = CodeCache::find_blob(pc);
2515 if (cb != NULL) {
2516 if (os::is_poll_address(addr)) {
2517 address stub = SharedRuntime::get_poll_stub(pc);
2518 return Handle_Exception(exceptionInfo, stub);
2519 }
2520 }
2521 {
2522 #ifdef _WIN64
2523 // If it's a legal stack address map the entire region in
2524 //
2525 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2526 address addr = (address) exceptionRecord->ExceptionInformation[1];
2527 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2528 addr = (address)((uintptr_t)addr &
2529 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2530 os::commit_memory((char *)addr, thread->stack_base() - addr,
2531 !ExecMem);
2532 return EXCEPTION_CONTINUE_EXECUTION;
2533 } else
2534 #endif
2535 {
2536 // Null pointer exception.
2537 #ifdef _M_IA64
2538 // Process implicit null checks in compiled code. Note: Implicit null checks
2539 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2540 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2541 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2542 // Handle implicit null check in UEP method entry
2543 if (cb && (cb->is_frame_complete_at(pc) ||
2544 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2545 if (Verbose) {
2546 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2547 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2548 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2549 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2550 *(bundle_start + 1), *bundle_start);
2551 }
2552 return Handle_Exception(exceptionInfo,
2553 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2554 }
2555 }
2556
2557 // Implicit null checks were processed above. Hence, we should not reach
2558 // here in the usual case => die!
2559 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2560 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2561 exceptionInfo->ContextRecord);
2562 return EXCEPTION_CONTINUE_SEARCH;
2563
2564 #else // !IA64
2565
2566 // Windows 98 reports faulting addresses incorrectly
2567 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2568 !os::win32::is_nt()) {
2569 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2570 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2571 }
2572 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2573 exceptionInfo->ContextRecord);
2574 return EXCEPTION_CONTINUE_SEARCH;
2575 #endif
2576 }
2577 }
2578 }
2579
2580 #ifdef _WIN64
2581 // Special care for fast JNI field accessors.
2582 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2583 // in and the heap gets shrunk before the field access.
2584 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2585 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2586 if (addr != (address)-1) {
2587 return Handle_Exception(exceptionInfo, addr);
2588 }
2589 }
2590 #endif
2591
2592 // Stack overflow or null pointer exception in native code.
2593 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2594 exceptionInfo->ContextRecord);
2595 return EXCEPTION_CONTINUE_SEARCH;
2596 } // /EXCEPTION_ACCESS_VIOLATION
2597 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2598 #if defined _M_IA64
2599 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2600 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2601 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2602
2603 // Compiled method patched to be non entrant? Following conditions must apply:
2604 // 1. must be first instruction in bundle
2605 // 2. must be a break instruction with appropriate code
2606 if ((((uint64_t) pc & 0x0F) == 0) &&
2607 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2608 return Handle_Exception(exceptionInfo,
2609 (address)SharedRuntime::get_handle_wrong_method_stub());
2610 }
2611 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2612 #endif
2613
2614
2615 if (in_java) {
2616 switch (exception_code) {
2617 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2618 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2619
2620 case EXCEPTION_INT_OVERFLOW:
2621 return Handle_IDiv_Exception(exceptionInfo);
2622
2623 } // switch
2624 }
2625 if (((thread->thread_state() == _thread_in_Java) ||
2626 (thread->thread_state() == _thread_in_native)) &&
2627 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2628 LONG result=Handle_FLT_Exception(exceptionInfo);
2629 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2630 }
2631 }
2632
2633 if (exception_code != EXCEPTION_BREAKPOINT) {
2634 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2635 exceptionInfo->ContextRecord);
2636 }
2637 return EXCEPTION_CONTINUE_SEARCH;
2638 }
2639
2640 #ifndef _WIN64
2641 // Special care for fast JNI accessors.
2642 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2643 // the heap gets shrunk before the field access.
2644 // Need to install our own structured exception handler since native code may
2645 // install its own.
2646 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2647 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2648 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2649 address pc = (address) exceptionInfo->ContextRecord->Eip;
2650 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2651 if (addr != (address)-1) {
2652 return Handle_Exception(exceptionInfo, addr);
2653 }
2654 }
2655 return EXCEPTION_CONTINUE_SEARCH;
2656 }
2657
2658 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2659 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2660 jobject obj, \
2661 jfieldID fieldID) { \
2662 __try { \
2663 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2664 obj, \
2665 fieldID); \
2666 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2667 _exception_info())) { \
2668 } \
2669 return 0; \
2670 }
2671
2672 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2673 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2674 DEFINE_FAST_GETFIELD(jchar, char, Char)
2675 DEFINE_FAST_GETFIELD(jshort, short, Short)
2676 DEFINE_FAST_GETFIELD(jint, int, Int)
2677 DEFINE_FAST_GETFIELD(jlong, long, Long)
2678 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2679 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2680
2681 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2682 switch (type) {
2683 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2684 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2685 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2686 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2687 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2688 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2689 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2690 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2691 default: ShouldNotReachHere();
2692 }
2693 return (address)-1;
2694 }
2695 #endif
2696
2697 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2698 // Install a win32 structured exception handler around the test
2699 // function call so the VM can generate an error dump if needed.
2700 __try {
2701 (*funcPtr)();
2702 } __except(topLevelExceptionFilter(
2703 (_EXCEPTION_POINTERS*)_exception_info())) {
2704 // Nothing to do.
2705 }
2706 }
2707
2708 // Virtual Memory
2709
2710 int os::vm_page_size() { return os::win32::vm_page_size(); }
2711 int os::vm_allocation_granularity() {
2712 return os::win32::vm_allocation_granularity();
2713 }
2714
2715 // Windows large page support is available on Windows 2003. In order to use
2716 // large page memory, the administrator must first assign additional privilege
2717 // to the user:
2718 // + select Control Panel -> Administrative Tools -> Local Security Policy
2719 // + select Local Policies -> User Rights Assignment
2720 // + double click "Lock pages in memory", add users and/or groups
2721 // + reboot
2722 // Note the above steps are needed for administrator as well, as administrators
2723 // by default do not have the privilege to lock pages in memory.
2724 //
2725 // Note about Windows 2003: although the API supports committing large page
2726 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2727 // scenario, I found through experiment it only uses large page if the entire
2728 // memory region is reserved and committed in a single VirtualAlloc() call.
2729 // This makes Windows large page support more or less like Solaris ISM, in
2730 // that the entire heap must be committed upfront. This probably will change
2731 // in the future, if so the code below needs to be revisited.
2732
2733 #ifndef MEM_LARGE_PAGES
2734 #define MEM_LARGE_PAGES 0x20000000
2735 #endif
2736
2737 static HANDLE _hProcess;
2738 static HANDLE _hToken;
2739
2740 // Container for NUMA node list info
2741 class NUMANodeListHolder {
2742 private:
2743 int *_numa_used_node_list; // allocated below
2744 int _numa_used_node_count;
2745
2746 void free_node_list() {
2747 if (_numa_used_node_list != NULL) {
2748 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2749 }
2750 }
2751
2752 public:
2753 NUMANodeListHolder() {
2754 _numa_used_node_count = 0;
2755 _numa_used_node_list = NULL;
2756 // do rest of initialization in build routine (after function pointers are set up)
2757 }
2758
2759 ~NUMANodeListHolder() {
2760 free_node_list();
2761 }
2762
2763 bool build() {
2764 DWORD_PTR proc_aff_mask;
2765 DWORD_PTR sys_aff_mask;
2766 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2767 ULONG highest_node_number;
2768 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2769 free_node_list();
2770 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2771 for (unsigned int i = 0; i <= highest_node_number; i++) {
2772 ULONGLONG proc_mask_numa_node;
2773 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2774 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2775 _numa_used_node_list[_numa_used_node_count++] = i;
2776 }
2777 }
2778 return (_numa_used_node_count > 1);
2779 }
2780
2781 int get_count() { return _numa_used_node_count; }
2782 int get_node_list_entry(int n) {
2783 // for indexes out of range, returns -1
2784 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2785 }
2786
2787 } numa_node_list_holder;
2788
2789
2790
2791 static size_t _large_page_size = 0;
2792
2793 static bool resolve_functions_for_large_page_init() {
2794 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2795 os::Advapi32Dll::AdvapiAvailable();
2796 }
2797
2798 static bool request_lock_memory_privilege() {
2799 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2800 os::current_process_id());
2801
2802 LUID luid;
2803 if (_hProcess != NULL &&
2804 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2805 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2806
2807 TOKEN_PRIVILEGES tp;
2808 tp.PrivilegeCount = 1;
2809 tp.Privileges[0].Luid = luid;
2810 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2811
2812 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2813 // privilege. Check GetLastError() too. See MSDN document.
2814 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2815 (GetLastError() == ERROR_SUCCESS)) {
2816 return true;
2817 }
2818 }
2819
2820 return false;
2821 }
2822
2823 static void cleanup_after_large_page_init() {
2824 if (_hProcess) CloseHandle(_hProcess);
2825 _hProcess = NULL;
2826 if (_hToken) CloseHandle(_hToken);
2827 _hToken = NULL;
2828 }
2829
2830 static bool numa_interleaving_init() {
2831 bool success = false;
2832 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2833
2834 // print a warning if UseNUMAInterleaving flag is specified on command line
2835 bool warn_on_failure = use_numa_interleaving_specified;
2836 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2837
2838 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2839 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2840 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2841
2842 if (os::Kernel32Dll::NumaCallsAvailable()) {
2843 if (numa_node_list_holder.build()) {
2844 if (PrintMiscellaneous && Verbose) {
2845 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2846 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2847 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2848 }
2849 tty->print("\n");
2850 }
2851 success = true;
2852 } else {
2853 WARN("Process does not cover multiple NUMA nodes.");
2854 }
2855 } else {
2856 WARN("NUMA Interleaving is not supported by the operating system.");
2857 }
2858 if (!success) {
2859 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2860 }
2861 return success;
2862 #undef WARN
2863 }
2864
2865 // this routine is used whenever we need to reserve a contiguous VA range
2866 // but we need to make separate VirtualAlloc calls for each piece of the range
2867 // Reasons for doing this:
2868 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2869 // * UseNUMAInterleaving requires a separate node for each piece
2870 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2871 DWORD prot,
2872 bool should_inject_error = false) {
2873 char * p_buf;
2874 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2875 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2876 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2877
2878 // first reserve enough address space in advance since we want to be
2879 // able to break a single contiguous virtual address range into multiple
2880 // large page commits but WS2003 does not allow reserving large page space
2881 // so we just use 4K pages for reserve, this gives us a legal contiguous
2882 // address space. then we will deallocate that reservation, and re alloc
2883 // using large pages
2884 const size_t size_of_reserve = bytes + chunk_size;
2885 if (bytes > size_of_reserve) {
2886 // Overflowed.
2887 return NULL;
2888 }
2889 p_buf = (char *) VirtualAlloc(addr,
2890 size_of_reserve, // size of Reserve
2891 MEM_RESERVE,
2892 PAGE_READWRITE);
2893 // If reservation failed, return NULL
2894 if (p_buf == NULL) return NULL;
2895 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2896 os::release_memory(p_buf, bytes + chunk_size);
2897
2898 // we still need to round up to a page boundary (in case we are using large pages)
2899 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2900 // instead we handle this in the bytes_to_rq computation below
2901 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2902
2903 // now go through and allocate one chunk at a time until all bytes are
2904 // allocated
2905 size_t bytes_remaining = bytes;
2906 // An overflow of align_size_up() would have been caught above
2907 // in the calculation of size_of_reserve.
2908 char * next_alloc_addr = p_buf;
2909 HANDLE hProc = GetCurrentProcess();
2910
2911 #ifdef ASSERT
2912 // Variable for the failure injection
2913 long ran_num = os::random();
2914 size_t fail_after = ran_num % bytes;
2915 #endif
2916
2917 int count=0;
2918 while (bytes_remaining) {
2919 // select bytes_to_rq to get to the next chunk_size boundary
2920
2921 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2922 // Note allocate and commit
2923 char * p_new;
2924
2925 #ifdef ASSERT
2926 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2927 #else
2928 const bool inject_error_now = false;
2929 #endif
2930
2931 if (inject_error_now) {
2932 p_new = NULL;
2933 } else {
2934 if (!UseNUMAInterleaving) {
2935 p_new = (char *) VirtualAlloc(next_alloc_addr,
2936 bytes_to_rq,
2937 flags,
2938 prot);
2939 } else {
2940 // get the next node to use from the used_node_list
2941 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2942 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2943 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2944 next_alloc_addr,
2945 bytes_to_rq,
2946 flags,
2947 prot,
2948 node);
2949 }
2950 }
2951
2952 if (p_new == NULL) {
2953 // Free any allocated pages
2954 if (next_alloc_addr > p_buf) {
2955 // Some memory was committed so release it.
2956 size_t bytes_to_release = bytes - bytes_remaining;
2957 // NMT has yet to record any individual blocks, so it
2958 // need to create a dummy 'reserve' record to match
2959 // the release.
2960 MemTracker::record_virtual_memory_reserve((address)p_buf,
2961 bytes_to_release, CALLER_PC);
2962 os::release_memory(p_buf, bytes_to_release);
2963 }
2964 #ifdef ASSERT
2965 if (should_inject_error) {
2966 if (TracePageSizes && Verbose) {
2967 tty->print_cr("Reserving pages individually failed.");
2968 }
2969 }
2970 #endif
2971 return NULL;
2972 }
2973
2974 bytes_remaining -= bytes_to_rq;
2975 next_alloc_addr += bytes_to_rq;
2976 count++;
2977 }
2978 // Although the memory is allocated individually, it is returned as one.
2979 // NMT records it as one block.
2980 if ((flags & MEM_COMMIT) != 0) {
2981 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2982 } else {
2983 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2984 }
2985
2986 // made it this far, success
2987 return p_buf;
2988 }
2989
2990
2991
2992 void os::large_page_init() {
2993 if (!UseLargePages) return;
2994
2995 // print a warning if any large page related flag is specified on command line
2996 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2997 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2998 bool success = false;
2999
3000 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3001 if (resolve_functions_for_large_page_init()) {
3002 if (request_lock_memory_privilege()) {
3003 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3004 if (s) {
3005 #if defined(IA32) || defined(AMD64)
3006 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3007 WARN("JVM cannot use large pages bigger than 4mb.");
3008 } else {
3009 #endif
3010 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3011 _large_page_size = LargePageSizeInBytes;
3012 } else {
3013 _large_page_size = s;
3014 }
3015 success = true;
3016 #if defined(IA32) || defined(AMD64)
3017 }
3018 #endif
3019 } else {
3020 WARN("Large page is not supported by the processor.");
3021 }
3022 } else {
3023 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3024 }
3025 } else {
3026 WARN("Large page is not supported by the operating system.");
3027 }
3028 #undef WARN
3029
3030 const size_t default_page_size = (size_t) vm_page_size();
3031 if (success && _large_page_size > default_page_size) {
3032 _page_sizes[0] = _large_page_size;
3033 _page_sizes[1] = default_page_size;
3034 _page_sizes[2] = 0;
3035 }
3036
3037 cleanup_after_large_page_init();
3038 UseLargePages = success;
3039 }
3040
3041 // On win32, one cannot release just a part of reserved memory, it's an
3042 // all or nothing deal. When we split a reservation, we must break the
3043 // reservation into two reservations.
3044 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3045 bool realloc) {
3046 if (size > 0) {
3047 release_memory(base, size);
3048 if (realloc) {
3049 reserve_memory(split, base);
3050 }
3051 if (size != split) {
3052 reserve_memory(size - split, base + split);
3053 }
3054 }
3055 }
3056
3057 // Multiple threads can race in this code but it's not possible to unmap small sections of
3058 // virtual space to get requested alignment, like posix-like os's.
3059 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3060 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3061 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3062 "Alignment must be a multiple of allocation granularity (page size)");
3063 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3064
3065 size_t extra_size = size + alignment;
3066 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3067
3068 char* aligned_base = NULL;
3069
3070 do {
3071 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3072 if (extra_base == NULL) {
3073 return NULL;
3074 }
3075 // Do manual alignment
3076 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3077
3078 os::release_memory(extra_base, extra_size);
3079
3080 aligned_base = os::reserve_memory(size, aligned_base);
3081
3082 } while (aligned_base == NULL);
3083
3084 return aligned_base;
3085 }
3086
3087 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3088 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3089 "reserve alignment");
3090 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3091 char* res;
3092 // note that if UseLargePages is on, all the areas that require interleaving
3093 // will go thru reserve_memory_special rather than thru here.
3094 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3095 if (!use_individual) {
3096 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3097 } else {
3098 elapsedTimer reserveTimer;
3099 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3100 // in numa interleaving, we have to allocate pages individually
3101 // (well really chunks of NUMAInterleaveGranularity size)
3102 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3103 if (res == NULL) {
3104 warning("NUMA page allocation failed");
3105 }
3106 if (Verbose && PrintMiscellaneous) {
3107 reserveTimer.stop();
3108 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3109 reserveTimer.milliseconds(), reserveTimer.ticks());
3110 }
3111 }
3112 assert(res == NULL || addr == NULL || addr == res,
3113 "Unexpected address from reserve.");
3114
3115 return res;
3116 }
3117
3118 // Reserve memory at an arbitrary address, only if that area is
3119 // available (and not reserved for something else).
3120 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3121 // Windows os::reserve_memory() fails of the requested address range is
3122 // not avilable.
3123 return reserve_memory(bytes, requested_addr);
3124 }
3125
3126 size_t os::large_page_size() {
3127 return _large_page_size;
3128 }
3129
3130 bool os::can_commit_large_page_memory() {
3131 // Windows only uses large page memory when the entire region is reserved
3132 // and committed in a single VirtualAlloc() call. This may change in the
3133 // future, but with Windows 2003 it's not possible to commit on demand.
3134 return false;
3135 }
3136
3137 bool os::can_execute_large_page_memory() {
3138 return true;
3139 }
3140
3141 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3142 bool exec) {
3143 assert(UseLargePages, "only for large pages");
3144
3145 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3146 return NULL; // Fallback to small pages.
3147 }
3148
3149 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3150 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3151
3152 // with large pages, there are two cases where we need to use Individual Allocation
3153 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3154 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3155 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3156 if (TracePageSizes && Verbose) {
3157 tty->print_cr("Reserving large pages individually.");
3158 }
3159 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3160 if (p_buf == NULL) {
3161 // give an appropriate warning message
3162 if (UseNUMAInterleaving) {
3163 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3164 }
3165 if (UseLargePagesIndividualAllocation) {
3166 warning("Individually allocated large pages failed, "
3167 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3168 }
3169 return NULL;
3170 }
3171
3172 return p_buf;
3173
3174 } else {
3175 if (TracePageSizes && Verbose) {
3176 tty->print_cr("Reserving large pages in a single large chunk.");
3177 }
3178 // normal policy just allocate it all at once
3179 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3180 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3181 if (res != NULL) {
3182 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3183 }
3184
3185 return res;
3186 }
3187 }
3188
3189 bool os::release_memory_special(char* base, size_t bytes) {
3190 assert(base != NULL, "Sanity check");
3191 return release_memory(base, bytes);
3192 }
3193
3194 void os::print_statistics() {
3195 }
3196
3197 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3198 int err = os::get_last_error();
3199 char buf[256];
3200 size_t buf_len = os::lasterror(buf, sizeof(buf));
3201 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3202 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3203 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3204 }
3205
3206 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3207 if (bytes == 0) {
3208 // Don't bother the OS with noops.
3209 return true;
3210 }
3211 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3212 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3213 // Don't attempt to print anything if the OS call fails. We're
3214 // probably low on resources, so the print itself may cause crashes.
3215
3216 // unless we have NUMAInterleaving enabled, the range of a commit
3217 // is always within a reserve covered by a single VirtualAlloc
3218 // in that case we can just do a single commit for the requested size
3219 if (!UseNUMAInterleaving) {
3220 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3221 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3222 return false;
3223 }
3224 if (exec) {
3225 DWORD oldprot;
3226 // Windows doc says to use VirtualProtect to get execute permissions
3227 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3228 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3229 return false;
3230 }
3231 }
3232 return true;
3233 } else {
3234
3235 // when NUMAInterleaving is enabled, the commit might cover a range that
3236 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3237 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3238 // returns represents the number of bytes that can be committed in one step.
3239 size_t bytes_remaining = bytes;
3240 char * next_alloc_addr = addr;
3241 while (bytes_remaining > 0) {
3242 MEMORY_BASIC_INFORMATION alloc_info;
3243 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3244 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3245 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3246 PAGE_READWRITE) == NULL) {
3247 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3248 exec);)
3249 return false;
3250 }
3251 if (exec) {
3252 DWORD oldprot;
3253 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3254 PAGE_EXECUTE_READWRITE, &oldprot)) {
3255 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3256 exec);)
3257 return false;
3258 }
3259 }
3260 bytes_remaining -= bytes_to_rq;
3261 next_alloc_addr += bytes_to_rq;
3262 }
3263 }
3264 // if we made it this far, return true
3265 return true;
3266 }
3267
3268 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3269 bool exec) {
3270 // alignment_hint is ignored on this OS
3271 return pd_commit_memory(addr, size, exec);
3272 }
3273
3274 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3275 const char* mesg) {
3276 assert(mesg != NULL, "mesg must be specified");
3277 if (!pd_commit_memory(addr, size, exec)) {
3278 warn_fail_commit_memory(addr, size, exec);
3279 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3280 }
3281 }
3282
3283 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3284 size_t alignment_hint, bool exec,
3285 const char* mesg) {
3286 // alignment_hint is ignored on this OS
3287 pd_commit_memory_or_exit(addr, size, exec, mesg);
3288 }
3289
3290 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3291 if (bytes == 0) {
3292 // Don't bother the OS with noops.
3293 return true;
3294 }
3295 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3296 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3297 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3298 }
3299
3300 bool os::pd_release_memory(char* addr, size_t bytes) {
3301 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3302 }
3303
3304 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3305 return os::commit_memory(addr, size, !ExecMem);
3306 }
3307
3308 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3309 return os::uncommit_memory(addr, size);
3310 }
3311
3312 // Set protections specified
3313 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3314 bool is_committed) {
3315 unsigned int p = 0;
3316 switch (prot) {
3317 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3318 case MEM_PROT_READ: p = PAGE_READONLY; break;
3319 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3320 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3321 default:
3322 ShouldNotReachHere();
3323 }
3324
3325 DWORD old_status;
3326
3327 // Strange enough, but on Win32 one can change protection only for committed
3328 // memory, not a big deal anyway, as bytes less or equal than 64K
3329 if (!is_committed) {
3330 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3331 "cannot commit protection page");
3332 }
3333 // One cannot use os::guard_memory() here, as on Win32 guard page
3334 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3335 //
3336 // Pages in the region become guard pages. Any attempt to access a guard page
3337 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3338 // the guard page status. Guard pages thus act as a one-time access alarm.
3339 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3340 }
3341
3342 bool os::guard_memory(char* addr, size_t bytes) {
3343 DWORD old_status;
3344 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3345 }
3346
3347 bool os::unguard_memory(char* addr, size_t bytes) {
3348 DWORD old_status;
3349 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3350 }
3351
3352 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3353 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3354 void os::numa_make_global(char *addr, size_t bytes) { }
3355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3356 bool os::numa_topology_changed() { return false; }
3357 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3358 int os::numa_get_group_id() { return 0; }
3359 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3360 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3361 // Provide an answer for UMA systems
3362 ids[0] = 0;
3363 return 1;
3364 } else {
3365 // check for size bigger than actual groups_num
3366 size = MIN2(size, numa_get_groups_num());
3367 for (int i = 0; i < (int)size; i++) {
3368 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3369 }
3370 return size;
3371 }
3372 }
3373
3374 bool os::get_page_info(char *start, page_info* info) {
3375 return false;
3376 }
3377
3378 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3379 page_info* page_found) {
3380 return end;
3381 }
3382
3383 char* os::non_memory_address_word() {
3384 // Must never look like an address returned by reserve_memory,
3385 // even in its subfields (as defined by the CPU immediate fields,
3386 // if the CPU splits constants across multiple instructions).
3387 return (char*)-1;
3388 }
3389
3390 #define MAX_ERROR_COUNT 100
3391 #define SYS_THREAD_ERROR 0xffffffffUL
3392
3393 void os::pd_start_thread(Thread* thread) {
3394 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3395 // Returns previous suspend state:
3396 // 0: Thread was not suspended
3397 // 1: Thread is running now
3398 // >1: Thread is still suspended.
3399 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3400 }
3401
3402 class HighResolutionInterval : public CHeapObj<mtThread> {
3403 // The default timer resolution seems to be 10 milliseconds.
3404 // (Where is this written down?)
3405 // If someone wants to sleep for only a fraction of the default,
3406 // then we set the timer resolution down to 1 millisecond for
3407 // the duration of their interval.
3408 // We carefully set the resolution back, since otherwise we
3409 // seem to incur an overhead (3%?) that we don't need.
3410 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3411 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3412 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3413 // timeBeginPeriod() if the relative error exceeded some threshold.
3414 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3415 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3416 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3417 // resolution timers running.
3418 private:
3419 jlong resolution;
3420 public:
3421 HighResolutionInterval(jlong ms) {
3422 resolution = ms % 10L;
3423 if (resolution != 0) {
3424 MMRESULT result = timeBeginPeriod(1L);
3425 }
3426 }
3427 ~HighResolutionInterval() {
3428 if (resolution != 0) {
3429 MMRESULT result = timeEndPeriod(1L);
3430 }
3431 resolution = 0L;
3432 }
3433 };
3434
3435 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3436 jlong limit = (jlong) MAXDWORD;
3437
3438 while (ms > limit) {
3439 int res;
3440 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3441 return res;
3442 }
3443 ms -= limit;
3444 }
3445
3446 assert(thread == Thread::current(), "thread consistency check");
3447 OSThread* osthread = thread->osthread();
3448 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3449 int result;
3450 if (interruptable) {
3451 assert(thread->is_Java_thread(), "must be java thread");
3452 JavaThread *jt = (JavaThread *) thread;
3453 ThreadBlockInVM tbivm(jt);
3454
3455 jt->set_suspend_equivalent();
3456 // cleared by handle_special_suspend_equivalent_condition() or
3457 // java_suspend_self() via check_and_wait_while_suspended()
3458
3459 HANDLE events[1];
3460 events[0] = osthread->interrupt_event();
3461 HighResolutionInterval *phri=NULL;
3462 if (!ForceTimeHighResolution) {
3463 phri = new HighResolutionInterval(ms);
3464 }
3465 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3466 result = OS_TIMEOUT;
3467 } else {
3468 ResetEvent(osthread->interrupt_event());
3469 osthread->set_interrupted(false);
3470 result = OS_INTRPT;
3471 }
3472 delete phri; //if it is NULL, harmless
3473
3474 // were we externally suspended while we were waiting?
3475 jt->check_and_wait_while_suspended();
3476 } else {
3477 assert(!thread->is_Java_thread(), "must not be java thread");
3478 Sleep((long) ms);
3479 result = OS_TIMEOUT;
3480 }
3481 return result;
3482 }
3483
3484 // Short sleep, direct OS call.
3485 //
3486 // ms = 0, means allow others (if any) to run.
3487 //
3488 void os::naked_short_sleep(jlong ms) {
3489 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3490 Sleep(ms);
3491 }
3492
3493 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3494 void os::infinite_sleep() {
3495 while (true) { // sleep forever ...
3496 Sleep(100000); // ... 100 seconds at a time
3497 }
3498 }
3499
3500 typedef BOOL (WINAPI * STTSignature)(void);
3501
3502 void os::naked_yield() {
3503 // Use either SwitchToThread() or Sleep(0)
3504 // Consider passing back the return value from SwitchToThread().
3505 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3506 SwitchToThread();
3507 } else {
3508 Sleep(0);
3509 }
3510 }
3511
3512 // Win32 only gives you access to seven real priorities at a time,
3513 // so we compress Java's ten down to seven. It would be better
3514 // if we dynamically adjusted relative priorities.
3515
3516 int os::java_to_os_priority[CriticalPriority + 1] = {
3517 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3518 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3519 THREAD_PRIORITY_LOWEST, // 2
3520 THREAD_PRIORITY_BELOW_NORMAL, // 3
3521 THREAD_PRIORITY_BELOW_NORMAL, // 4
3522 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3523 THREAD_PRIORITY_NORMAL, // 6
3524 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3525 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3526 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3527 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3528 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3529 };
3530
3531 int prio_policy1[CriticalPriority + 1] = {
3532 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3533 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3534 THREAD_PRIORITY_LOWEST, // 2
3535 THREAD_PRIORITY_BELOW_NORMAL, // 3
3536 THREAD_PRIORITY_BELOW_NORMAL, // 4
3537 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3540 THREAD_PRIORITY_HIGHEST, // 8
3541 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3542 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3543 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3544 };
3545
3546 static int prio_init() {
3547 // If ThreadPriorityPolicy is 1, switch tables
3548 if (ThreadPriorityPolicy == 1) {
3549 int i;
3550 for (i = 0; i < CriticalPriority + 1; i++) {
3551 os::java_to_os_priority[i] = prio_policy1[i];
3552 }
3553 }
3554 if (UseCriticalJavaThreadPriority) {
3555 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3556 }
3557 return 0;
3558 }
3559
3560 OSReturn os::set_native_priority(Thread* thread, int priority) {
3561 if (!UseThreadPriorities) return OS_OK;
3562 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3563 return ret ? OS_OK : OS_ERR;
3564 }
3565
3566 OSReturn os::get_native_priority(const Thread* const thread,
3567 int* priority_ptr) {
3568 if (!UseThreadPriorities) {
3569 *priority_ptr = java_to_os_priority[NormPriority];
3570 return OS_OK;
3571 }
3572 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3573 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3574 assert(false, "GetThreadPriority failed");
3575 return OS_ERR;
3576 }
3577 *priority_ptr = os_prio;
3578 return OS_OK;
3579 }
3580
3581
3582 // Hint to the underlying OS that a task switch would not be good.
3583 // Void return because it's a hint and can fail.
3584 void os::hint_no_preempt() {}
3585
3586 void os::interrupt(Thread* thread) {
3587 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3588 Threads_lock->owned_by_self(),
3589 "possibility of dangling Thread pointer");
3590
3591 OSThread* osthread = thread->osthread();
3592 osthread->set_interrupted(true);
3593 // More than one thread can get here with the same value of osthread,
3594 // resulting in multiple notifications. We do, however, want the store
3595 // to interrupted() to be visible to other threads before we post
3596 // the interrupt event.
3597 OrderAccess::release();
3598 SetEvent(osthread->interrupt_event());
3599 // For JSR166: unpark after setting status
3600 if (thread->is_Java_thread()) {
3601 ((JavaThread*)thread)->parker()->unpark();
3602 }
3603
3604 ParkEvent * ev = thread->_ParkEvent;
3605 if (ev != NULL) ev->unpark();
3606 }
3607
3608
3609 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3610 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3611 "possibility of dangling Thread pointer");
3612
3613 OSThread* osthread = thread->osthread();
3614 // There is no synchronization between the setting of the interrupt
3615 // and it being cleared here. It is critical - see 6535709 - that
3616 // we only clear the interrupt state, and reset the interrupt event,
3617 // if we are going to report that we were indeed interrupted - else
3618 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3619 // depending on the timing. By checking thread interrupt event to see
3620 // if the thread gets real interrupt thus prevent spurious wakeup.
3621 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3622 if (interrupted && clear_interrupted) {
3623 osthread->set_interrupted(false);
3624 ResetEvent(osthread->interrupt_event());
3625 } // Otherwise leave the interrupted state alone
3626
3627 return interrupted;
3628 }
3629
3630 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3631 ExtendedPC os::get_thread_pc(Thread* thread) {
3632 CONTEXT context;
3633 context.ContextFlags = CONTEXT_CONTROL;
3634 HANDLE handle = thread->osthread()->thread_handle();
3635 #ifdef _M_IA64
3636 assert(0, "Fix get_thread_pc");
3637 return ExtendedPC(NULL);
3638 #else
3639 if (GetThreadContext(handle, &context)) {
3640 #ifdef _M_AMD64
3641 return ExtendedPC((address) context.Rip);
3642 #else
3643 return ExtendedPC((address) context.Eip);
3644 #endif
3645 } else {
3646 return ExtendedPC(NULL);
3647 }
3648 #endif
3649 }
3650
3651 // GetCurrentThreadId() returns DWORD
3652 intx os::current_thread_id() { return GetCurrentThreadId(); }
3653
3654 static int _initial_pid = 0;
3655
3656 int os::current_process_id() {
3657 return (_initial_pid ? _initial_pid : _getpid());
3658 }
3659
3660 int os::win32::_vm_page_size = 0;
3661 int os::win32::_vm_allocation_granularity = 0;
3662 int os::win32::_processor_type = 0;
3663 // Processor level is not available on non-NT systems, use vm_version instead
3664 int os::win32::_processor_level = 0;
3665 julong os::win32::_physical_memory = 0;
3666 size_t os::win32::_default_stack_size = 0;
3667
3668 intx os::win32::_os_thread_limit = 0;
3669 volatile intx os::win32::_os_thread_count = 0;
3670
3671 bool os::win32::_is_nt = false;
3672 bool os::win32::_is_windows_2003 = false;
3673 bool os::win32::_is_windows_server = false;
3674
3675 // 6573254
3676 // Currently, the bug is observed across all the supported Windows releases,
3677 // including the latest one (as of this writing - Windows Server 2012 R2)
3678 bool os::win32::_has_exit_bug = true;
3679 bool os::win32::_has_performance_count = 0;
3680
3681 void os::win32::initialize_system_info() {
3682 SYSTEM_INFO si;
3683 GetSystemInfo(&si);
3684 _vm_page_size = si.dwPageSize;
3685 _vm_allocation_granularity = si.dwAllocationGranularity;
3686 _processor_type = si.dwProcessorType;
3687 _processor_level = si.wProcessorLevel;
3688 set_processor_count(si.dwNumberOfProcessors);
3689
3690 MEMORYSTATUSEX ms;
3691 ms.dwLength = sizeof(ms);
3692
3693 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3694 // dwMemoryLoad (% of memory in use)
3695 GlobalMemoryStatusEx(&ms);
3696 _physical_memory = ms.ullTotalPhys;
3697
3698 OSVERSIONINFOEX oi;
3699 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3700 GetVersionEx((OSVERSIONINFO*)&oi);
3701 switch (oi.dwPlatformId) {
3702 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3703 case VER_PLATFORM_WIN32_NT:
3704 _is_nt = true;
3705 {
3706 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3707 if (os_vers == 5002) {
3708 _is_windows_2003 = true;
3709 }
3710 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3711 oi.wProductType == VER_NT_SERVER) {
3712 _is_windows_server = true;
3713 }
3714 }
3715 break;
3716 default: fatal("Unknown platform");
3717 }
3718
3719 _default_stack_size = os::current_stack_size();
3720 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3721 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3722 "stack size not a multiple of page size");
3723
3724 initialize_performance_counter();
3725
3726 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3727 // known to deadlock the system, if the VM issues to thread operations with
3728 // a too high frequency, e.g., such as changing the priorities.
3729 // The 6000 seems to work well - no deadlocks has been notices on the test
3730 // programs that we have seen experience this problem.
3731 if (!os::win32::is_nt()) {
3732 StarvationMonitorInterval = 6000;
3733 }
3734 }
3735
3736
3737 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3738 int ebuflen) {
3739 char path[MAX_PATH];
3740 DWORD size;
3741 DWORD pathLen = (DWORD)sizeof(path);
3742 HINSTANCE result = NULL;
3743
3744 // only allow library name without path component
3745 assert(strchr(name, '\\') == NULL, "path not allowed");
3746 assert(strchr(name, ':') == NULL, "path not allowed");
3747 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3748 jio_snprintf(ebuf, ebuflen,
3749 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3750 return NULL;
3751 }
3752
3753 // search system directory
3754 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3755 if (size >= pathLen) {
3756 return NULL; // truncated
3757 }
3758 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3759 return NULL; // truncated
3760 }
3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3762 return result;
3763 }
3764 }
3765
3766 // try Windows directory
3767 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3768 if (size >= pathLen) {
3769 return NULL; // truncated
3770 }
3771 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3772 return NULL; // truncated
3773 }
3774 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3775 return result;
3776 }
3777 }
3778
3779 jio_snprintf(ebuf, ebuflen,
3780 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3781 return NULL;
3782 }
3783
3784 #define EXIT_TIMEOUT PRODUCT_ONLY(1000) NOT_PRODUCT(4000) /* 1 sec in product, 4 sec in debug */
3785
3786 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3787 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3788 return TRUE;
3789 }
3790
3791 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3792 // Basic approach:
3793 // - Each exiting thread registers its intent to exit and then does so.
3794 // - A thread trying to terminate the process must wait for all
3795 // threads currently exiting to complete their exit.
3796
3797 if (os::win32::has_exit_bug()) {
3798 // The array holds handles of the threads that have started exiting by calling
3799 // _endthreadex().
3800 // Should be large enough to avoid blocking the exiting thread due to lack of
3801 // a free slot.
3802 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3803 static int handle_count = 0;
3804
3805 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3806 static CRITICAL_SECTION crit_sect;
3807 static volatile jint process_exiting = 0;
3808 int i, j;
3809 DWORD res;
3810 HANDLE hproc, hthr;
3811
3812 // The first thread that reached this point, initializes the critical section.
3813 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3814 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3815 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3816 EnterCriticalSection(&crit_sect);
3817
3818 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3819 // Remove from the array those handles of the threads that have completed exiting.
3820 for (i = 0, j = 0; i < handle_count; ++i) {
3821 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3822 if (res == WAIT_TIMEOUT) {
3823 handles[j++] = handles[i];
3824 } else {
3825 if (res == WAIT_FAILED) {
3826 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3827 GetLastError(), __FILE__, __LINE__);
3828 }
3829 // Don't keep the handle, if we failed waiting for it.
3830 CloseHandle(handles[i]);
3831 }
3832 }
3833
3834 // If there's no free slot in the array of the kept handles, we'll have to
3835 // wait until at least one thread completes exiting.
3836 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3837 // Raise the priority of the oldest exiting thread to increase its chances
3838 // to complete sooner.
3839 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3840 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3841 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3842 i = (res - WAIT_OBJECT_0);
3843 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3844 for (; i < handle_count; ++i) {
3845 handles[i] = handles[i + 1];
3846 }
3847 } else {
3848 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3849 (res == WAIT_FAILED ? "failed" : "timed out"),
3850 GetLastError(), __FILE__, __LINE__);
3851 // Don't keep handles, if we failed waiting for them.
3852 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3853 CloseHandle(handles[i]);
3854 }
3855 handle_count = 0;
3856 }
3857 }
3858
3859 // Store a duplicate of the current thread handle in the array of handles.
3860 hproc = GetCurrentProcess();
3861 hthr = GetCurrentThread();
3862 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3863 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3864 warning("DuplicateHandle failed (%u) in %s: %d\n",
3865 GetLastError(), __FILE__, __LINE__);
3866 } else {
3867 ++handle_count;
3868 }
3869
3870 // The current exiting thread has stored its handle in the array, and now
3871 // should leave the critical section before calling _endthreadex().
3872
3873 } else if (what != EPT_THREAD) {
3874 if (handle_count > 0) {
3875 // Before ending the process, make sure all the threads that had called
3876 // _endthreadex() completed.
3877
3878 // Set the priority level of the current thread to the same value as
3879 // the priority level of exiting threads.
3880 // This is to ensure it will be given a fair chance to execute if
3881 // the timeout expires.
3882 hthr = GetCurrentThread();
3883 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3884 for (i = 0; i < handle_count; ++i) {
3885 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3886 }
3887 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3888 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3889 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3890 (res == WAIT_FAILED ? "failed" : "timed out"),
3891 GetLastError(), __FILE__, __LINE__);
3892 }
3893 for (i = 0; i < handle_count; ++i) {
3894 CloseHandle(handles[i]);
3895 }
3896 handle_count = 0;
3897 }
3898
3899 OrderAccess::release_store(&process_exiting, 1);
3900 }
3901
3902 LeaveCriticalSection(&crit_sect);
3903 }
3904
3905 if (what == EPT_THREAD) {
3906 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3907 // Some other thread is about to call exit(), so we
3908 // don't let the current thread proceed to _endthreadex()
3909 SuspendThread(GetCurrentThread());
3910 // Avoid busy-wait loop, if SuspendThread() failed.
3911 Sleep(EXIT_TIMEOUT);
3912 }
3913 }
3914 }
3915
3916 // We are here if either
3917 // - there's no 'race at exit' bug on this OS release;
3918 // - initialization of the critical section failed (unlikely);
3919 // - the current thread has stored its handle and left the critical section;
3920 // - the process-exiting thread has raised the flag and left the critical section.
3921 if (what == EPT_THREAD) {
3922 _endthreadex((unsigned)exit_code);
3923 } else if (what == EPT_PROCESS) {
3924 ::exit(exit_code);
3925 } else {
3926 _exit(exit_code);
3927 }
3928
3929 // Should not reach here
3930 return exit_code;
3931 }
3932
3933 #undef EXIT_TIMEOUT
3934
3935 void os::win32::setmode_streams() {
3936 _setmode(_fileno(stdin), _O_BINARY);
3937 _setmode(_fileno(stdout), _O_BINARY);
3938 _setmode(_fileno(stderr), _O_BINARY);
3939 }
3940
3941
3942 bool os::is_debugger_attached() {
3943 return IsDebuggerPresent() ? true : false;
3944 }
3945
3946
3947 void os::wait_for_keypress_at_exit(void) {
3948 if (PauseAtExit) {
3949 fprintf(stderr, "Press any key to continue...\n");
3950 fgetc(stdin);
3951 }
3952 }
3953
3954
3955 int os::message_box(const char* title, const char* message) {
3956 int result = MessageBox(NULL, message, title,
3957 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3958 return result == IDYES;
3959 }
3960
3961 int os::allocate_thread_local_storage() {
3962 return TlsAlloc();
3963 }
3964
3965
3966 void os::free_thread_local_storage(int index) {
3967 TlsFree(index);
3968 }
3969
3970
3971 void os::thread_local_storage_at_put(int index, void* value) {
3972 TlsSetValue(index, value);
3973 assert(thread_local_storage_at(index) == value, "Just checking");
3974 }
3975
3976
3977 void* os::thread_local_storage_at(int index) {
3978 return TlsGetValue(index);
3979 }
3980
3981
3982 #ifndef PRODUCT
3983 #ifndef _WIN64
3984 // Helpers to check whether NX protection is enabled
3985 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3986 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3987 pex->ExceptionRecord->NumberParameters > 0 &&
3988 pex->ExceptionRecord->ExceptionInformation[0] ==
3989 EXCEPTION_INFO_EXEC_VIOLATION) {
3990 return EXCEPTION_EXECUTE_HANDLER;
3991 }
3992 return EXCEPTION_CONTINUE_SEARCH;
3993 }
3994
3995 void nx_check_protection() {
3996 // If NX is enabled we'll get an exception calling into code on the stack
3997 char code[] = { (char)0xC3 }; // ret
3998 void *code_ptr = (void *)code;
3999 __try {
4000 __asm call code_ptr
4001 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4002 tty->print_raw_cr("NX protection detected.");
4003 }
4004 }
4005 #endif // _WIN64
4006 #endif // PRODUCT
4007
4008 // this is called _before_ the global arguments have been parsed
4009 void os::init(void) {
4010 _initial_pid = _getpid();
4011
4012 init_random(1234567);
4013
4014 win32::initialize_system_info();
4015 win32::setmode_streams();
4016 init_page_sizes((size_t) win32::vm_page_size());
4017
4018 // This may be overridden later when argument processing is done.
4019 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4020 os::win32::is_windows_2003());
4021
4022 // Initialize main_process and main_thread
4023 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4024 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4025 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4026 fatal("DuplicateHandle failed\n");
4027 }
4028 main_thread_id = (int) GetCurrentThreadId();
4029 }
4030
4031 // To install functions for atexit processing
4032 extern "C" {
4033 static void perfMemory_exit_helper() {
4034 perfMemory_exit();
4035 }
4036 }
4037
4038 static jint initSock();
4039
4040 // this is called _after_ the global arguments have been parsed
4041 jint os::init_2(void) {
4042 // Allocate a single page and mark it as readable for safepoint polling
4043 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4044 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4045
4046 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4047 guarantee(return_page != NULL, "Commit Failed for polling page");
4048
4049 os::set_polling_page(polling_page);
4050
4051 #ifndef PRODUCT
4052 if (Verbose && PrintMiscellaneous) {
4053 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4054 (intptr_t)polling_page);
4055 }
4056 #endif
4057
4058 if (!UseMembar) {
4059 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4060 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4061
4062 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4063 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4064
4065 os::set_memory_serialize_page(mem_serialize_page);
4066
4067 #ifndef PRODUCT
4068 if (Verbose && PrintMiscellaneous) {
4069 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4070 (intptr_t)mem_serialize_page);
4071 }
4072 #endif
4073 }
4074
4075 // Setup Windows Exceptions
4076
4077 // for debugging float code generation bugs
4078 if (ForceFloatExceptions) {
4079 #ifndef _WIN64
4080 static long fp_control_word = 0;
4081 __asm { fstcw fp_control_word }
4082 // see Intel PPro Manual, Vol. 2, p 7-16
4083 const long precision = 0x20;
4084 const long underflow = 0x10;
4085 const long overflow = 0x08;
4086 const long zero_div = 0x04;
4087 const long denorm = 0x02;
4088 const long invalid = 0x01;
4089 fp_control_word |= invalid;
4090 __asm { fldcw fp_control_word }
4091 #endif
4092 }
4093
4094 // If stack_commit_size is 0, windows will reserve the default size,
4095 // but only commit a small portion of it.
4096 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4097 size_t default_reserve_size = os::win32::default_stack_size();
4098 size_t actual_reserve_size = stack_commit_size;
4099 if (stack_commit_size < default_reserve_size) {
4100 // If stack_commit_size == 0, we want this too
4101 actual_reserve_size = default_reserve_size;
4102 }
4103
4104 // Check minimum allowable stack size for thread creation and to initialize
4105 // the java system classes, including StackOverflowError - depends on page
4106 // size. Add a page for compiler2 recursion in main thread.
4107 // Add in 2*BytesPerWord times page size to account for VM stack during
4108 // class initialization depending on 32 or 64 bit VM.
4109 size_t min_stack_allowed =
4110 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4111 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4112 if (actual_reserve_size < min_stack_allowed) {
4113 tty->print_cr("\nThe stack size specified is too small, "
4114 "Specify at least %dk",
4115 min_stack_allowed / K);
4116 return JNI_ERR;
4117 }
4118
4119 JavaThread::set_stack_size_at_create(stack_commit_size);
4120
4121 // Calculate theoretical max. size of Threads to guard gainst artifical
4122 // out-of-memory situations, where all available address-space has been
4123 // reserved by thread stacks.
4124 assert(actual_reserve_size != 0, "Must have a stack");
4125
4126 // Calculate the thread limit when we should start doing Virtual Memory
4127 // banging. Currently when the threads will have used all but 200Mb of space.
4128 //
4129 // TODO: consider performing a similar calculation for commit size instead
4130 // as reserve size, since on a 64-bit platform we'll run into that more
4131 // often than running out of virtual memory space. We can use the
4132 // lower value of the two calculations as the os_thread_limit.
4133 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4134 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4135
4136 // at exit methods are called in the reverse order of their registration.
4137 // there is no limit to the number of functions registered. atexit does
4138 // not set errno.
4139
4140 if (PerfAllowAtExitRegistration) {
4141 // only register atexit functions if PerfAllowAtExitRegistration is set.
4142 // atexit functions can be delayed until process exit time, which
4143 // can be problematic for embedded VM situations. Embedded VMs should
4144 // call DestroyJavaVM() to assure that VM resources are released.
4145
4146 // note: perfMemory_exit_helper atexit function may be removed in
4147 // the future if the appropriate cleanup code can be added to the
4148 // VM_Exit VMOperation's doit method.
4149 if (atexit(perfMemory_exit_helper) != 0) {
4150 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4151 }
4152 }
4153
4154 #ifndef _WIN64
4155 // Print something if NX is enabled (win32 on AMD64)
4156 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4157 #endif
4158
4159 // initialize thread priority policy
4160 prio_init();
4161
4162 if (UseNUMA && !ForceNUMA) {
4163 UseNUMA = false; // We don't fully support this yet
4164 }
4165
4166 if (UseNUMAInterleaving) {
4167 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4168 bool success = numa_interleaving_init();
4169 if (!success) UseNUMAInterleaving = false;
4170 }
4171
4172 if (initSock() != JNI_OK) {
4173 return JNI_ERR;
4174 }
4175
4176 return JNI_OK;
4177 }
4178
4179 // Mark the polling page as unreadable
4180 void os::make_polling_page_unreadable(void) {
4181 DWORD old_status;
4182 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4183 PAGE_NOACCESS, &old_status)) {
4184 fatal("Could not disable polling page");
4185 }
4186 }
4187
4188 // Mark the polling page as readable
4189 void os::make_polling_page_readable(void) {
4190 DWORD old_status;
4191 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4192 PAGE_READONLY, &old_status)) {
4193 fatal("Could not enable polling page");
4194 }
4195 }
4196
4197
4198 int os::stat(const char *path, struct stat *sbuf) {
4199 char pathbuf[MAX_PATH];
4200 if (strlen(path) > MAX_PATH - 1) {
4201 errno = ENAMETOOLONG;
4202 return -1;
4203 }
4204 os::native_path(strcpy(pathbuf, path));
4205 int ret = ::stat(pathbuf, sbuf);
4206 if (sbuf != NULL && UseUTCFileTimestamp) {
4207 // Fix for 6539723. st_mtime returned from stat() is dependent on
4208 // the system timezone and so can return different values for the
4209 // same file if/when daylight savings time changes. This adjustment
4210 // makes sure the same timestamp is returned regardless of the TZ.
4211 //
4212 // See:
4213 // http://msdn.microsoft.com/library/
4214 // default.asp?url=/library/en-us/sysinfo/base/
4215 // time_zone_information_str.asp
4216 // and
4217 // http://msdn.microsoft.com/library/default.asp?url=
4218 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4219 //
4220 // NOTE: there is a insidious bug here: If the timezone is changed
4221 // after the call to stat() but before 'GetTimeZoneInformation()', then
4222 // the adjustment we do here will be wrong and we'll return the wrong
4223 // value (which will likely end up creating an invalid class data
4224 // archive). Absent a better API for this, or some time zone locking
4225 // mechanism, we'll have to live with this risk.
4226 TIME_ZONE_INFORMATION tz;
4227 DWORD tzid = GetTimeZoneInformation(&tz);
4228 int daylightBias =
4229 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4230 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4231 }
4232 return ret;
4233 }
4234
4235
4236 #define FT2INT64(ft) \
4237 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4238
4239
4240 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4241 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4242 // of a thread.
4243 //
4244 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4245 // the fast estimate available on the platform.
4246
4247 // current_thread_cpu_time() is not optimized for Windows yet
4248 jlong os::current_thread_cpu_time() {
4249 // return user + sys since the cost is the same
4250 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4251 }
4252
4253 jlong os::thread_cpu_time(Thread* thread) {
4254 // consistent with what current_thread_cpu_time() returns.
4255 return os::thread_cpu_time(thread, true /* user+sys */);
4256 }
4257
4258 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4259 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4260 }
4261
4262 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4263 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4264 // If this function changes, os::is_thread_cpu_time_supported() should too
4265 if (os::win32::is_nt()) {
4266 FILETIME CreationTime;
4267 FILETIME ExitTime;
4268 FILETIME KernelTime;
4269 FILETIME UserTime;
4270
4271 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4272 &ExitTime, &KernelTime, &UserTime) == 0) {
4273 return -1;
4274 } else if (user_sys_cpu_time) {
4275 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4276 } else {
4277 return FT2INT64(UserTime) * 100;
4278 }
4279 } else {
4280 return (jlong) timeGetTime() * 1000000;
4281 }
4282 }
4283
4284 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4285 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4286 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4287 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4288 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4289 }
4290
4291 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4292 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4293 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4294 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4295 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4296 }
4297
4298 bool os::is_thread_cpu_time_supported() {
4299 // see os::thread_cpu_time
4300 if (os::win32::is_nt()) {
4301 FILETIME CreationTime;
4302 FILETIME ExitTime;
4303 FILETIME KernelTime;
4304 FILETIME UserTime;
4305
4306 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4307 &KernelTime, &UserTime) == 0) {
4308 return false;
4309 } else {
4310 return true;
4311 }
4312 } else {
4313 return false;
4314 }
4315 }
4316
4317 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4318 // It does have primitives (PDH API) to get CPU usage and run queue length.
4319 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4320 // If we wanted to implement loadavg on Windows, we have a few options:
4321 //
4322 // a) Query CPU usage and run queue length and "fake" an answer by
4323 // returning the CPU usage if it's under 100%, and the run queue
4324 // length otherwise. It turns out that querying is pretty slow
4325 // on Windows, on the order of 200 microseconds on a fast machine.
4326 // Note that on the Windows the CPU usage value is the % usage
4327 // since the last time the API was called (and the first call
4328 // returns 100%), so we'd have to deal with that as well.
4329 //
4330 // b) Sample the "fake" answer using a sampling thread and store
4331 // the answer in a global variable. The call to loadavg would
4332 // just return the value of the global, avoiding the slow query.
4333 //
4334 // c) Sample a better answer using exponential decay to smooth the
4335 // value. This is basically the algorithm used by UNIX kernels.
4336 //
4337 // Note that sampling thread starvation could affect both (b) and (c).
4338 int os::loadavg(double loadavg[], int nelem) {
4339 return -1;
4340 }
4341
4342
4343 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4344 bool os::dont_yield() {
4345 return DontYieldALot;
4346 }
4347
4348 // This method is a slightly reworked copy of JDK's sysOpen
4349 // from src/windows/hpi/src/sys_api_md.c
4350
4351 int os::open(const char *path, int oflag, int mode) {
4352 char pathbuf[MAX_PATH];
4353
4354 if (strlen(path) > MAX_PATH - 1) {
4355 errno = ENAMETOOLONG;
4356 return -1;
4357 }
4358 os::native_path(strcpy(pathbuf, path));
4359 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4360 }
4361
4362 FILE* os::open(int fd, const char* mode) {
4363 return ::_fdopen(fd, mode);
4364 }
4365
4366 // Is a (classpath) directory empty?
4367 bool os::dir_is_empty(const char* path) {
4368 WIN32_FIND_DATA fd;
4369 HANDLE f = FindFirstFile(path, &fd);
4370 if (f == INVALID_HANDLE_VALUE) {
4371 return true;
4372 }
4373 FindClose(f);
4374 return false;
4375 }
4376
4377 // create binary file, rewriting existing file if required
4378 int os::create_binary_file(const char* path, bool rewrite_existing) {
4379 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4380 if (!rewrite_existing) {
4381 oflags |= _O_EXCL;
4382 }
4383 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4384 }
4385
4386 // return current position of file pointer
4387 jlong os::current_file_offset(int fd) {
4388 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4389 }
4390
4391 // move file pointer to the specified offset
4392 jlong os::seek_to_file_offset(int fd, jlong offset) {
4393 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4394 }
4395
4396
4397 jlong os::lseek(int fd, jlong offset, int whence) {
4398 return (jlong) ::_lseeki64(fd, offset, whence);
4399 }
4400
4401 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4402 OVERLAPPED ov;
4403 DWORD nread;
4404 BOOL result;
4405
4406 ZeroMemory(&ov, sizeof(ov));
4407 ov.Offset = (DWORD)offset;
4408 ov.OffsetHigh = (DWORD)(offset >> 32);
4409
4410 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4411
4412 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4413
4414 return result ? nread : 0;
4415 }
4416
4417
4418 // This method is a slightly reworked copy of JDK's sysNativePath
4419 // from src/windows/hpi/src/path_md.c
4420
4421 // Convert a pathname to native format. On win32, this involves forcing all
4422 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4423 // sometimes rejects '/') and removing redundant separators. The input path is
4424 // assumed to have been converted into the character encoding used by the local
4425 // system. Because this might be a double-byte encoding, care is taken to
4426 // treat double-byte lead characters correctly.
4427 //
4428 // This procedure modifies the given path in place, as the result is never
4429 // longer than the original. There is no error return; this operation always
4430 // succeeds.
4431 char * os::native_path(char *path) {
4432 char *src = path, *dst = path, *end = path;
4433 char *colon = NULL; // If a drive specifier is found, this will
4434 // point to the colon following the drive letter
4435
4436 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4437 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4438 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4439
4440 // Check for leading separators
4441 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4442 while (isfilesep(*src)) {
4443 src++;
4444 }
4445
4446 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4447 // Remove leading separators if followed by drive specifier. This
4448 // hack is necessary to support file URLs containing drive
4449 // specifiers (e.g., "file://c:/path"). As a side effect,
4450 // "/c:/path" can be used as an alternative to "c:/path".
4451 *dst++ = *src++;
4452 colon = dst;
4453 *dst++ = ':';
4454 src++;
4455 } else {
4456 src = path;
4457 if (isfilesep(src[0]) && isfilesep(src[1])) {
4458 // UNC pathname: Retain first separator; leave src pointed at
4459 // second separator so that further separators will be collapsed
4460 // into the second separator. The result will be a pathname
4461 // beginning with "\\\\" followed (most likely) by a host name.
4462 src = dst = path + 1;
4463 path[0] = '\\'; // Force first separator to '\\'
4464 }
4465 }
4466
4467 end = dst;
4468
4469 // Remove redundant separators from remainder of path, forcing all
4470 // separators to be '\\' rather than '/'. Also, single byte space
4471 // characters are removed from the end of the path because those
4472 // are not legal ending characters on this operating system.
4473 //
4474 while (*src != '\0') {
4475 if (isfilesep(*src)) {
4476 *dst++ = '\\'; src++;
4477 while (isfilesep(*src)) src++;
4478 if (*src == '\0') {
4479 // Check for trailing separator
4480 end = dst;
4481 if (colon == dst - 2) break; // "z:\\"
4482 if (dst == path + 1) break; // "\\"
4483 if (dst == path + 2 && isfilesep(path[0])) {
4484 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4485 // beginning of a UNC pathname. Even though it is not, by
4486 // itself, a valid UNC pathname, we leave it as is in order
4487 // to be consistent with the path canonicalizer as well
4488 // as the win32 APIs, which treat this case as an invalid
4489 // UNC pathname rather than as an alias for the root
4490 // directory of the current drive.
4491 break;
4492 }
4493 end = --dst; // Path does not denote a root directory, so
4494 // remove trailing separator
4495 break;
4496 }
4497 end = dst;
4498 } else {
4499 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4500 *dst++ = *src++;
4501 if (*src) *dst++ = *src++;
4502 end = dst;
4503 } else { // Copy a single-byte character
4504 char c = *src++;
4505 *dst++ = c;
4506 // Space is not a legal ending character
4507 if (c != ' ') end = dst;
4508 }
4509 }
4510 }
4511
4512 *end = '\0';
4513
4514 // For "z:", add "." to work around a bug in the C runtime library
4515 if (colon == dst - 1) {
4516 path[2] = '.';
4517 path[3] = '\0';
4518 }
4519
4520 return path;
4521 }
4522
4523 // This code is a copy of JDK's sysSetLength
4524 // from src/windows/hpi/src/sys_api_md.c
4525
4526 int os::ftruncate(int fd, jlong length) {
4527 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4528 long high = (long)(length >> 32);
4529 DWORD ret;
4530
4531 if (h == (HANDLE)(-1)) {
4532 return -1;
4533 }
4534
4535 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4536 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4537 return -1;
4538 }
4539
4540 if (::SetEndOfFile(h) == FALSE) {
4541 return -1;
4542 }
4543
4544 return 0;
4545 }
4546
4547
4548 // This code is a copy of JDK's sysSync
4549 // from src/windows/hpi/src/sys_api_md.c
4550 // except for the legacy workaround for a bug in Win 98
4551
4552 int os::fsync(int fd) {
4553 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4554
4555 if ((!::FlushFileBuffers(handle)) &&
4556 (GetLastError() != ERROR_ACCESS_DENIED)) {
4557 // from winerror.h
4558 return -1;
4559 }
4560 return 0;
4561 }
4562
4563 static int nonSeekAvailable(int, long *);
4564 static int stdinAvailable(int, long *);
4565
4566 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4567 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4568
4569 // This code is a copy of JDK's sysAvailable
4570 // from src/windows/hpi/src/sys_api_md.c
4571
4572 int os::available(int fd, jlong *bytes) {
4573 jlong cur, end;
4574 struct _stati64 stbuf64;
4575
4576 if (::_fstati64(fd, &stbuf64) >= 0) {
4577 int mode = stbuf64.st_mode;
4578 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4579 int ret;
4580 long lpbytes;
4581 if (fd == 0) {
4582 ret = stdinAvailable(fd, &lpbytes);
4583 } else {
4584 ret = nonSeekAvailable(fd, &lpbytes);
4585 }
4586 (*bytes) = (jlong)(lpbytes);
4587 return ret;
4588 }
4589 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4590 return FALSE;
4591 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4592 return FALSE;
4593 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4594 return FALSE;
4595 }
4596 *bytes = end - cur;
4597 return TRUE;
4598 } else {
4599 return FALSE;
4600 }
4601 }
4602
4603 // This code is a copy of JDK's nonSeekAvailable
4604 // from src/windows/hpi/src/sys_api_md.c
4605
4606 static int nonSeekAvailable(int fd, long *pbytes) {
4607 // This is used for available on non-seekable devices
4608 // (like both named and anonymous pipes, such as pipes
4609 // connected to an exec'd process).
4610 // Standard Input is a special case.
4611 HANDLE han;
4612
4613 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4614 return FALSE;
4615 }
4616
4617 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4618 // PeekNamedPipe fails when at EOF. In that case we
4619 // simply make *pbytes = 0 which is consistent with the
4620 // behavior we get on Solaris when an fd is at EOF.
4621 // The only alternative is to raise an Exception,
4622 // which isn't really warranted.
4623 //
4624 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4625 return FALSE;
4626 }
4627 *pbytes = 0;
4628 }
4629 return TRUE;
4630 }
4631
4632 #define MAX_INPUT_EVENTS 2000
4633
4634 // This code is a copy of JDK's stdinAvailable
4635 // from src/windows/hpi/src/sys_api_md.c
4636
4637 static int stdinAvailable(int fd, long *pbytes) {
4638 HANDLE han;
4639 DWORD numEventsRead = 0; // Number of events read from buffer
4640 DWORD numEvents = 0; // Number of events in buffer
4641 DWORD i = 0; // Loop index
4642 DWORD curLength = 0; // Position marker
4643 DWORD actualLength = 0; // Number of bytes readable
4644 BOOL error = FALSE; // Error holder
4645 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4646
4647 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4648 return FALSE;
4649 }
4650
4651 // Construct an array of input records in the console buffer
4652 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4653 if (error == 0) {
4654 return nonSeekAvailable(fd, pbytes);
4655 }
4656
4657 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4658 if (numEvents > MAX_INPUT_EVENTS) {
4659 numEvents = MAX_INPUT_EVENTS;
4660 }
4661
4662 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4663 if (lpBuffer == NULL) {
4664 return FALSE;
4665 }
4666
4667 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4668 if (error == 0) {
4669 os::free(lpBuffer);
4670 return FALSE;
4671 }
4672
4673 // Examine input records for the number of bytes available
4674 for (i=0; i<numEvents; i++) {
4675 if (lpBuffer[i].EventType == KEY_EVENT) {
4676
4677 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4678 &(lpBuffer[i].Event);
4679 if (keyRecord->bKeyDown == TRUE) {
4680 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4681 curLength++;
4682 if (*keyPressed == '\r') {
4683 actualLength = curLength;
4684 }
4685 }
4686 }
4687 }
4688
4689 if (lpBuffer != NULL) {
4690 os::free(lpBuffer);
4691 }
4692
4693 *pbytes = (long) actualLength;
4694 return TRUE;
4695 }
4696
4697 // Map a block of memory.
4698 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4699 char *addr, size_t bytes, bool read_only,
4700 bool allow_exec) {
4701 HANDLE hFile;
4702 char* base;
4703
4704 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4705 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4706 if (hFile == NULL) {
4707 if (PrintMiscellaneous && Verbose) {
4708 DWORD err = GetLastError();
4709 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4710 }
4711 return NULL;
4712 }
4713
4714 if (allow_exec) {
4715 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4716 // unless it comes from a PE image (which the shared archive is not.)
4717 // Even VirtualProtect refuses to give execute access to mapped memory
4718 // that was not previously executable.
4719 //
4720 // Instead, stick the executable region in anonymous memory. Yuck.
4721 // Penalty is that ~4 pages will not be shareable - in the future
4722 // we might consider DLLizing the shared archive with a proper PE
4723 // header so that mapping executable + sharing is possible.
4724
4725 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4726 PAGE_READWRITE);
4727 if (base == NULL) {
4728 if (PrintMiscellaneous && Verbose) {
4729 DWORD err = GetLastError();
4730 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4731 }
4732 CloseHandle(hFile);
4733 return NULL;
4734 }
4735
4736 DWORD bytes_read;
4737 OVERLAPPED overlapped;
4738 overlapped.Offset = (DWORD)file_offset;
4739 overlapped.OffsetHigh = 0;
4740 overlapped.hEvent = NULL;
4741 // ReadFile guarantees that if the return value is true, the requested
4742 // number of bytes were read before returning.
4743 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4744 if (!res) {
4745 if (PrintMiscellaneous && Verbose) {
4746 DWORD err = GetLastError();
4747 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4748 }
4749 release_memory(base, bytes);
4750 CloseHandle(hFile);
4751 return NULL;
4752 }
4753 } else {
4754 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4755 NULL /* file_name */);
4756 if (hMap == NULL) {
4757 if (PrintMiscellaneous && Verbose) {
4758 DWORD err = GetLastError();
4759 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4760 }
4761 CloseHandle(hFile);
4762 return NULL;
4763 }
4764
4765 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4766 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4767 (DWORD)bytes, addr);
4768 if (base == NULL) {
4769 if (PrintMiscellaneous && Verbose) {
4770 DWORD err = GetLastError();
4771 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4772 }
4773 CloseHandle(hMap);
4774 CloseHandle(hFile);
4775 return NULL;
4776 }
4777
4778 if (CloseHandle(hMap) == 0) {
4779 if (PrintMiscellaneous && Verbose) {
4780 DWORD err = GetLastError();
4781 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4782 }
4783 CloseHandle(hFile);
4784 return base;
4785 }
4786 }
4787
4788 if (allow_exec) {
4789 DWORD old_protect;
4790 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4791 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4792
4793 if (!res) {
4794 if (PrintMiscellaneous && Verbose) {
4795 DWORD err = GetLastError();
4796 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4797 }
4798 // Don't consider this a hard error, on IA32 even if the
4799 // VirtualProtect fails, we should still be able to execute
4800 CloseHandle(hFile);
4801 return base;
4802 }
4803 }
4804
4805 if (CloseHandle(hFile) == 0) {
4806 if (PrintMiscellaneous && Verbose) {
4807 DWORD err = GetLastError();
4808 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4809 }
4810 return base;
4811 }
4812
4813 return base;
4814 }
4815
4816
4817 // Remap a block of memory.
4818 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4819 char *addr, size_t bytes, bool read_only,
4820 bool allow_exec) {
4821 // This OS does not allow existing memory maps to be remapped so we
4822 // have to unmap the memory before we remap it.
4823 if (!os::unmap_memory(addr, bytes)) {
4824 return NULL;
4825 }
4826
4827 // There is a very small theoretical window between the unmap_memory()
4828 // call above and the map_memory() call below where a thread in native
4829 // code may be able to access an address that is no longer mapped.
4830
4831 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4832 read_only, allow_exec);
4833 }
4834
4835
4836 // Unmap a block of memory.
4837 // Returns true=success, otherwise false.
4838
4839 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4840 BOOL result = UnmapViewOfFile(addr);
4841 if (result == 0) {
4842 if (PrintMiscellaneous && Verbose) {
4843 DWORD err = GetLastError();
4844 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4845 }
4846 return false;
4847 }
4848 return true;
4849 }
4850
4851 void os::pause() {
4852 char filename[MAX_PATH];
4853 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4854 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4855 } else {
4856 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4857 }
4858
4859 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4860 if (fd != -1) {
4861 struct stat buf;
4862 ::close(fd);
4863 while (::stat(filename, &buf) == 0) {
4864 Sleep(100);
4865 }
4866 } else {
4867 jio_fprintf(stderr,
4868 "Could not open pause file '%s', continuing immediately.\n", filename);
4869 }
4870 }
4871
4872 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4873 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4874 }
4875
4876 // See the caveats for this class in os_windows.hpp
4877 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4878 // into this method and returns false. If no OS EXCEPTION was raised, returns
4879 // true.
4880 // The callback is supposed to provide the method that should be protected.
4881 //
4882 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4883 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4884 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4885 "crash_protection already set?");
4886
4887 bool success = true;
4888 __try {
4889 WatcherThread::watcher_thread()->set_crash_protection(this);
4890 cb.call();
4891 } __except(EXCEPTION_EXECUTE_HANDLER) {
4892 // only for protection, nothing to do
4893 success = false;
4894 }
4895 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4896 return success;
4897 }
4898
4899 // An Event wraps a win32 "CreateEvent" kernel handle.
4900 //
4901 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4902 //
4903 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4904 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4905 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4906 // In addition, an unpark() operation might fetch the handle field, but the
4907 // event could recycle between the fetch and the SetEvent() operation.
4908 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4909 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4910 // on an stale but recycled handle would be harmless, but in practice this might
4911 // confuse other non-Sun code, so it's not a viable approach.
4912 //
4913 // 2: Once a win32 event handle is associated with an Event, it remains associated
4914 // with the Event. The event handle is never closed. This could be construed
4915 // as handle leakage, but only up to the maximum # of threads that have been extant
4916 // at any one time. This shouldn't be an issue, as windows platforms typically
4917 // permit a process to have hundreds of thousands of open handles.
4918 //
4919 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4920 // and release unused handles.
4921 //
4922 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4923 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4924 //
4925 // 5. Use an RCU-like mechanism (Read-Copy Update).
4926 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4927 //
4928 // We use (2).
4929 //
4930 // TODO-FIXME:
4931 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4932 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4933 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4934 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4935 // into a single win32 CreateEvent() handle.
4936 //
4937 // Assumption:
4938 // Only one parker can exist on an event, which is why we allocate
4939 // them per-thread. Multiple unparkers can coexist.
4940 //
4941 // _Event transitions in park()
4942 // -1 => -1 : illegal
4943 // 1 => 0 : pass - return immediately
4944 // 0 => -1 : block; then set _Event to 0 before returning
4945 //
4946 // _Event transitions in unpark()
4947 // 0 => 1 : just return
4948 // 1 => 1 : just return
4949 // -1 => either 0 or 1; must signal target thread
4950 // That is, we can safely transition _Event from -1 to either
4951 // 0 or 1.
4952 //
4953 // _Event serves as a restricted-range semaphore.
4954 // -1 : thread is blocked, i.e. there is a waiter
4955 // 0 : neutral: thread is running or ready,
4956 // could have been signaled after a wait started
4957 // 1 : signaled - thread is running or ready
4958 //
4959 // Another possible encoding of _Event would be with
4960 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4961 //
4962
4963 int os::PlatformEvent::park(jlong Millis) {
4964 // Transitions for _Event:
4965 // -1 => -1 : illegal
4966 // 1 => 0 : pass - return immediately
4967 // 0 => -1 : block; then set _Event to 0 before returning
4968
4969 guarantee(_ParkHandle != NULL , "Invariant");
4970 guarantee(Millis > 0 , "Invariant");
4971
4972 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4973 // the initial park() operation.
4974 // Consider: use atomic decrement instead of CAS-loop
4975
4976 int v;
4977 for (;;) {
4978 v = _Event;
4979 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4980 }
4981 guarantee((v == 0) || (v == 1), "invariant");
4982 if (v != 0) return OS_OK;
4983
4984 // Do this the hard way by blocking ...
4985 // TODO: consider a brief spin here, gated on the success of recent
4986 // spin attempts by this thread.
4987 //
4988 // We decompose long timeouts into series of shorter timed waits.
4989 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4990 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4991 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4992 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4993 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4994 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4995 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4996 // for the already waited time. This policy does not admit any new outcomes.
4997 // In the future, however, we might want to track the accumulated wait time and
4998 // adjust Millis accordingly if we encounter a spurious wakeup.
4999
5000 const int MAXTIMEOUT = 0x10000000;
5001 DWORD rv = WAIT_TIMEOUT;
5002 while (_Event < 0 && Millis > 0) {
5003 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5004 if (Millis > MAXTIMEOUT) {
5005 prd = MAXTIMEOUT;
5006 }
5007 rv = ::WaitForSingleObject(_ParkHandle, prd);
5008 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5009 if (rv == WAIT_TIMEOUT) {
5010 Millis -= prd;
5011 }
5012 }
5013 v = _Event;
5014 _Event = 0;
5015 // see comment at end of os::PlatformEvent::park() below:
5016 OrderAccess::fence();
5017 // If we encounter a nearly simultanous timeout expiry and unpark()
5018 // we return OS_OK indicating we awoke via unpark().
5019 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5020 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5021 }
5022
5023 void os::PlatformEvent::park() {
5024 // Transitions for _Event:
5025 // -1 => -1 : illegal
5026 // 1 => 0 : pass - return immediately
5027 // 0 => -1 : block; then set _Event to 0 before returning
5028
5029 guarantee(_ParkHandle != NULL, "Invariant");
5030 // Invariant: Only the thread associated with the Event/PlatformEvent
5031 // may call park().
5032 // Consider: use atomic decrement instead of CAS-loop
5033 int v;
5034 for (;;) {
5035 v = _Event;
5036 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5037 }
5038 guarantee((v == 0) || (v == 1), "invariant");
5039 if (v != 0) return;
5040
5041 // Do this the hard way by blocking ...
5042 // TODO: consider a brief spin here, gated on the success of recent
5043 // spin attempts by this thread.
5044 while (_Event < 0) {
5045 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5046 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5047 }
5048
5049 // Usually we'll find _Event == 0 at this point, but as
5050 // an optional optimization we clear it, just in case can
5051 // multiple unpark() operations drove _Event up to 1.
5052 _Event = 0;
5053 OrderAccess::fence();
5054 guarantee(_Event >= 0, "invariant");
5055 }
5056
5057 void os::PlatformEvent::unpark() {
5058 guarantee(_ParkHandle != NULL, "Invariant");
5059
5060 // Transitions for _Event:
5061 // 0 => 1 : just return
5062 // 1 => 1 : just return
5063 // -1 => either 0 or 1; must signal target thread
5064 // That is, we can safely transition _Event from -1 to either
5065 // 0 or 1.
5066 // See also: "Semaphores in Plan 9" by Mullender & Cox
5067 //
5068 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5069 // that it will take two back-to-back park() calls for the owning
5070 // thread to block. This has the benefit of forcing a spurious return
5071 // from the first park() call after an unpark() call which will help
5072 // shake out uses of park() and unpark() without condition variables.
5073
5074 if (Atomic::xchg(1, &_Event) >= 0) return;
5075
5076 ::SetEvent(_ParkHandle);
5077 }
5078
5079
5080 // JSR166
5081 // -------------------------------------------------------
5082
5083 // The Windows implementation of Park is very straightforward: Basic
5084 // operations on Win32 Events turn out to have the right semantics to
5085 // use them directly. We opportunistically resuse the event inherited
5086 // from Monitor.
5087
5088 void Parker::park(bool isAbsolute, jlong time) {
5089 guarantee(_ParkEvent != NULL, "invariant");
5090 // First, demultiplex/decode time arguments
5091 if (time < 0) { // don't wait
5092 return;
5093 } else if (time == 0 && !isAbsolute) {
5094 time = INFINITE;
5095 } else if (isAbsolute) {
5096 time -= os::javaTimeMillis(); // convert to relative time
5097 if (time <= 0) { // already elapsed
5098 return;
5099 }
5100 } else { // relative
5101 time /= 1000000; // Must coarsen from nanos to millis
5102 if (time == 0) { // Wait for the minimal time unit if zero
5103 time = 1;
5104 }
5105 }
5106
5107 JavaThread* thread = (JavaThread*)(Thread::current());
5108 assert(thread->is_Java_thread(), "Must be JavaThread");
5109 JavaThread *jt = (JavaThread *)thread;
5110
5111 // Don't wait if interrupted or already triggered
5112 if (Thread::is_interrupted(thread, false) ||
5113 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5114 ResetEvent(_ParkEvent);
5115 return;
5116 } else {
5117 ThreadBlockInVM tbivm(jt);
5118 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5119 jt->set_suspend_equivalent();
5120
5121 WaitForSingleObject(_ParkEvent, time);
5122 ResetEvent(_ParkEvent);
5123
5124 // If externally suspended while waiting, re-suspend
5125 if (jt->handle_special_suspend_equivalent_condition()) {
5126 jt->java_suspend_self();
5127 }
5128 }
5129 }
5130
5131 void Parker::unpark() {
5132 guarantee(_ParkEvent != NULL, "invariant");
5133 SetEvent(_ParkEvent);
5134 }
5135
5136 // Run the specified command in a separate process. Return its exit value,
5137 // or -1 on failure (e.g. can't create a new process).
5138 int os::fork_and_exec(char* cmd) {
5139 STARTUPINFO si;
5140 PROCESS_INFORMATION pi;
5141
5142 memset(&si, 0, sizeof(si));
5143 si.cb = sizeof(si);
5144 memset(&pi, 0, sizeof(pi));
5145 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5146 cmd, // command line
5147 NULL, // process security attribute
5148 NULL, // thread security attribute
5149 TRUE, // inherits system handles
5150 0, // no creation flags
5151 NULL, // use parent's environment block
5152 NULL, // use parent's starting directory
5153 &si, // (in) startup information
5154 &pi); // (out) process information
5155
5156 if (rslt) {
5157 // Wait until child process exits.
5158 WaitForSingleObject(pi.hProcess, INFINITE);
5159
5160 DWORD exit_code;
5161 GetExitCodeProcess(pi.hProcess, &exit_code);
5162
5163 // Close process and thread handles.
5164 CloseHandle(pi.hProcess);
5165 CloseHandle(pi.hThread);
5166
5167 return (int)exit_code;
5168 } else {
5169 return -1;
5170 }
5171 }
5172
5173 //--------------------------------------------------------------------------------------------------
5174 // Non-product code
5175
5176 static int mallocDebugIntervalCounter = 0;
5177 static int mallocDebugCounter = 0;
5178 bool os::check_heap(bool force) {
5179 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5180 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5181 // Note: HeapValidate executes two hardware breakpoints when it finds something
5182 // wrong; at these points, eax contains the address of the offending block (I think).
5183 // To get to the exlicit error message(s) below, just continue twice.
5184 HANDLE heap = GetProcessHeap();
5185
5186 // If we fail to lock the heap, then gflags.exe has been used
5187 // or some other special heap flag has been set that prevents
5188 // locking. We don't try to walk a heap we can't lock.
5189 if (HeapLock(heap) != 0) {
5190 PROCESS_HEAP_ENTRY phe;
5191 phe.lpData = NULL;
5192 while (HeapWalk(heap, &phe) != 0) {
5193 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5194 !HeapValidate(heap, 0, phe.lpData)) {
5195 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5196 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5197 fatal("corrupted C heap");
5198 }
5199 }
5200 DWORD err = GetLastError();
5201 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5202 fatal(err_msg("heap walk aborted with error %d", err));
5203 }
5204 HeapUnlock(heap);
5205 }
5206 mallocDebugIntervalCounter = 0;
5207 }
5208 return true;
5209 }
5210
5211
5212 bool os::find(address addr, outputStream* st) {
5213 // Nothing yet
5214 return false;
5215 }
5216
5217 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5218 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5219
5220 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5221 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5222 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5223 address addr = (address) exceptionRecord->ExceptionInformation[1];
5224
5225 if (os::is_memory_serialize_page(thread, addr)) {
5226 return EXCEPTION_CONTINUE_EXECUTION;
5227 }
5228 }
5229
5230 return EXCEPTION_CONTINUE_SEARCH;
5231 }
5232
5233 // We don't build a headless jre for Windows
5234 bool os::is_headless_jre() { return false; }
5235
5236 static jint initSock() {
5237 WSADATA wsadata;
5238
5239 if (!os::WinSock2Dll::WinSock2Available()) {
5240 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5241 ::GetLastError());
5242 return JNI_ERR;
5243 }
5244
5245 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5246 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5247 ::GetLastError());
5248 return JNI_ERR;
5249 }
5250 return JNI_OK;
5251 }
5252
5253 struct hostent* os::get_host_by_name(char* name) {
5254 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5255 }
5256
5257 int os::socket_close(int fd) {
5258 return ::closesocket(fd);
5259 }
5260
5261 int os::socket(int domain, int type, int protocol) {
5262 return ::socket(domain, type, protocol);
5263 }
5264
5265 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5266 return ::connect(fd, him, len);
5267 }
5268
5269 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5270 return ::recv(fd, buf, (int)nBytes, flags);
5271 }
5272
5273 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5274 return ::send(fd, buf, (int)nBytes, flags);
5275 }
5276
5277 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5278 return ::send(fd, buf, (int)nBytes, flags);
5279 }
5280
5281 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5282 #if defined(IA32)
5283 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5284 #elif defined (AMD64)
5285 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5286 #endif
5287
5288 // returns true if thread could be suspended,
5289 // false otherwise
5290 static bool do_suspend(HANDLE* h) {
5291 if (h != NULL) {
5292 if (SuspendThread(*h) != ~0) {
5293 return true;
5294 }
5295 }
5296 return false;
5297 }
5298
5299 // resume the thread
5300 // calling resume on an active thread is a no-op
5301 static void do_resume(HANDLE* h) {
5302 if (h != NULL) {
5303 ResumeThread(*h);
5304 }
5305 }
5306
5307 // retrieve a suspend/resume context capable handle
5308 // from the tid. Caller validates handle return value.
5309 void get_thread_handle_for_extended_context(HANDLE* h,
5310 OSThread::thread_id_t tid) {
5311 if (h != NULL) {
5312 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5313 }
5314 }
5315
5316 // Thread sampling implementation
5317 //
5318 void os::SuspendedThreadTask::internal_do_task() {
5319 CONTEXT ctxt;
5320 HANDLE h = NULL;
5321
5322 // get context capable handle for thread
5323 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5324
5325 // sanity
5326 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5327 return;
5328 }
5329
5330 // suspend the thread
5331 if (do_suspend(&h)) {
5332 ctxt.ContextFlags = sampling_context_flags;
5333 // get thread context
5334 GetThreadContext(h, &ctxt);
5335 SuspendedThreadTaskContext context(_thread, &ctxt);
5336 // pass context to Thread Sampling impl
5337 do_task(context);
5338 // resume thread
5339 do_resume(&h);
5340 }
5341
5342 // close handle
5343 CloseHandle(h);
5344 }
5345
5346
5347 // Kernel32 API
5348 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5349 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5350 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5351 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5352 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5353
5354 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5355 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5356 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5357 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5358 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5359
5360
5361 BOOL os::Kernel32Dll::initialized = FALSE;
5362 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5363 assert(initialized && _GetLargePageMinimum != NULL,
5364 "GetLargePageMinimumAvailable() not yet called");
5365 return _GetLargePageMinimum();
5366 }
5367
5368 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5369 if (!initialized) {
5370 initialize();
5371 }
5372 return _GetLargePageMinimum != NULL;
5373 }
5374
5375 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5376 if (!initialized) {
5377 initialize();
5378 }
5379 return _VirtualAllocExNuma != NULL;
5380 }
5381
5382 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5383 SIZE_T bytes, DWORD flags,
5384 DWORD prot, DWORD node) {
5385 assert(initialized && _VirtualAllocExNuma != NULL,
5386 "NUMACallsAvailable() not yet called");
5387
5388 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5389 }
5390
5391 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5392 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5393 "NUMACallsAvailable() not yet called");
5394
5395 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5396 }
5397
5398 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5399 PULONGLONG proc_mask) {
5400 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5401 "NUMACallsAvailable() not yet called");
5402
5403 return _GetNumaNodeProcessorMask(node, proc_mask);
5404 }
5405
5406 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5407 ULONG FrameToCapture,
5408 PVOID* BackTrace,
5409 PULONG BackTraceHash) {
5410 if (!initialized) {
5411 initialize();
5412 }
5413
5414 if (_RtlCaptureStackBackTrace != NULL) {
5415 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5416 BackTrace, BackTraceHash);
5417 } else {
5418 return 0;
5419 }
5420 }
5421
5422 void os::Kernel32Dll::initializeCommon() {
5423 if (!initialized) {
5424 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5425 assert(handle != NULL, "Just check");
5426 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5427 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5428 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5429 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5430 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5431 initialized = TRUE;
5432 }
5433 }
5434
5435
5436
5437 #ifndef JDK6_OR_EARLIER
5438
5439 void os::Kernel32Dll::initialize() {
5440 initializeCommon();
5441 }
5442
5443
5444 // Kernel32 API
5445 inline BOOL os::Kernel32Dll::SwitchToThread() {
5446 return ::SwitchToThread();
5447 }
5448
5449 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5450 return true;
5451 }
5452
5453 // Help tools
5454 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5455 return true;
5456 }
5457
5458 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5459 DWORD th32ProcessId) {
5460 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5461 }
5462
5463 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5464 LPMODULEENTRY32 lpme) {
5465 return ::Module32First(hSnapshot, lpme);
5466 }
5467
5468 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5469 LPMODULEENTRY32 lpme) {
5470 return ::Module32Next(hSnapshot, lpme);
5471 }
5472
5473 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5474 ::GetNativeSystemInfo(lpSystemInfo);
5475 }
5476
5477 // PSAPI API
5478 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5479 HMODULE *lpModule, DWORD cb,
5480 LPDWORD lpcbNeeded) {
5481 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5482 }
5483
5484 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5485 HMODULE hModule,
5486 LPTSTR lpFilename,
5487 DWORD nSize) {
5488 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5489 }
5490
5491 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5492 HMODULE hModule,
5493 LPMODULEINFO lpmodinfo,
5494 DWORD cb) {
5495 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5496 }
5497
5498 inline BOOL os::PSApiDll::PSApiAvailable() {
5499 return true;
5500 }
5501
5502
5503 // WinSock2 API
5504 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5505 LPWSADATA lpWSAData) {
5506 return ::WSAStartup(wVersionRequested, lpWSAData);
5507 }
5508
5509 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5510 return ::gethostbyname(name);
5511 }
5512
5513 inline BOOL os::WinSock2Dll::WinSock2Available() {
5514 return true;
5515 }
5516
5517 // Advapi API
5518 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5519 BOOL DisableAllPrivileges,
5520 PTOKEN_PRIVILEGES NewState,
5521 DWORD BufferLength,
5522 PTOKEN_PRIVILEGES PreviousState,
5523 PDWORD ReturnLength) {
5524 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5525 BufferLength, PreviousState, ReturnLength);
5526 }
5527
5528 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5529 DWORD DesiredAccess,
5530 PHANDLE TokenHandle) {
5531 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5532 }
5533
5534 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5535 LPCTSTR lpName,
5536 PLUID lpLuid) {
5537 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5538 }
5539
5540 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5541 return true;
5542 }
5543
5544 void* os::get_default_process_handle() {
5545 return (void*)GetModuleHandle(NULL);
5546 }
5547
5548 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5549 // which is used to find statically linked in agents.
5550 // Additionally for windows, takes into account __stdcall names.
5551 // Parameters:
5552 // sym_name: Symbol in library we are looking for
5553 // lib_name: Name of library to look in, NULL for shared libs.
5554 // is_absolute_path == true if lib_name is absolute path to agent
5555 // such as "C:/a/b/L.dll"
5556 // == false if only the base name of the library is passed in
5557 // such as "L"
5558 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5559 bool is_absolute_path) {
5560 char *agent_entry_name;
5561 size_t len;
5562 size_t name_len;
5563 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5564 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5565 const char *start;
5566
5567 if (lib_name != NULL) {
5568 len = name_len = strlen(lib_name);
5569 if (is_absolute_path) {
5570 // Need to strip path, prefix and suffix
5571 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5572 lib_name = ++start;
5573 } else {
5574 // Need to check for drive prefix
5575 if ((start = strchr(lib_name, ':')) != NULL) {
5576 lib_name = ++start;
5577 }
5578 }
5579 if (len <= (prefix_len + suffix_len)) {
5580 return NULL;
5581 }
5582 lib_name += prefix_len;
5583 name_len = strlen(lib_name) - suffix_len;
5584 }
5585 }
5586 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5587 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5588 if (agent_entry_name == NULL) {
5589 return NULL;
5590 }
5591 if (lib_name != NULL) {
5592 const char *p = strrchr(sym_name, '@');
5593 if (p != NULL && p != sym_name) {
5594 // sym_name == _Agent_OnLoad@XX
5595 strncpy(agent_entry_name, sym_name, (p - sym_name));
5596 agent_entry_name[(p-sym_name)] = '\0';
5597 // agent_entry_name == _Agent_OnLoad
5598 strcat(agent_entry_name, "_");
5599 strncat(agent_entry_name, lib_name, name_len);
5600 strcat(agent_entry_name, p);
5601 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5602 } else {
5603 strcpy(agent_entry_name, sym_name);
5604 strcat(agent_entry_name, "_");
5605 strncat(agent_entry_name, lib_name, name_len);
5606 }
5607 } else {
5608 strcpy(agent_entry_name, sym_name);
5609 }
5610 return agent_entry_name;
5611 }
5612
5613 #else
5614 // Kernel32 API
5615 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5616 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5617 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5618 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5619 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5620
5621 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5622 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5623 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5624 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5625 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5626
5627 void os::Kernel32Dll::initialize() {
5628 if (!initialized) {
5629 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5630 assert(handle != NULL, "Just check");
5631
5632 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5633 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5634 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5635 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5636 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5637 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5638 initializeCommon(); // resolve the functions that always need resolving
5639
5640 initialized = TRUE;
5641 }
5642 }
5643
5644 BOOL os::Kernel32Dll::SwitchToThread() {
5645 assert(initialized && _SwitchToThread != NULL,
5646 "SwitchToThreadAvailable() not yet called");
5647 return _SwitchToThread();
5648 }
5649
5650
5651 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5652 if (!initialized) {
5653 initialize();
5654 }
5655 return _SwitchToThread != NULL;
5656 }
5657
5658 // Help tools
5659 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5660 if (!initialized) {
5661 initialize();
5662 }
5663 return _CreateToolhelp32Snapshot != NULL &&
5664 _Module32First != NULL &&
5665 _Module32Next != NULL;
5666 }
5667
5668 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5669 DWORD th32ProcessId) {
5670 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5671 "HelpToolsAvailable() not yet called");
5672
5673 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5674 }
5675
5676 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5677 assert(initialized && _Module32First != NULL,
5678 "HelpToolsAvailable() not yet called");
5679
5680 return _Module32First(hSnapshot, lpme);
5681 }
5682
5683 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5684 LPMODULEENTRY32 lpme) {
5685 assert(initialized && _Module32Next != NULL,
5686 "HelpToolsAvailable() not yet called");
5687
5688 return _Module32Next(hSnapshot, lpme);
5689 }
5690
5691
5692 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5693 if (!initialized) {
5694 initialize();
5695 }
5696 return _GetNativeSystemInfo != NULL;
5697 }
5698
5699 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5700 assert(initialized && _GetNativeSystemInfo != NULL,
5701 "GetNativeSystemInfoAvailable() not yet called");
5702
5703 _GetNativeSystemInfo(lpSystemInfo);
5704 }
5705
5706 // PSAPI API
5707
5708
5709 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5710 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5711 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5712
5713 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5714 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5715 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5716 BOOL os::PSApiDll::initialized = FALSE;
5717
5718 void os::PSApiDll::initialize() {
5719 if (!initialized) {
5720 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5721 if (handle != NULL) {
5722 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5723 "EnumProcessModules");
5724 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5725 "GetModuleFileNameExA");
5726 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5727 "GetModuleInformation");
5728 }
5729 initialized = TRUE;
5730 }
5731 }
5732
5733
5734
5735 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5736 DWORD cb, LPDWORD lpcbNeeded) {
5737 assert(initialized && _EnumProcessModules != NULL,
5738 "PSApiAvailable() not yet called");
5739 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5740 }
5741
5742 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5743 LPTSTR lpFilename, DWORD nSize) {
5744 assert(initialized && _GetModuleFileNameEx != NULL,
5745 "PSApiAvailable() not yet called");
5746 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5747 }
5748
5749 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5750 LPMODULEINFO lpmodinfo, DWORD cb) {
5751 assert(initialized && _GetModuleInformation != NULL,
5752 "PSApiAvailable() not yet called");
5753 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5754 }
5755
5756 BOOL os::PSApiDll::PSApiAvailable() {
5757 if (!initialized) {
5758 initialize();
5759 }
5760 return _EnumProcessModules != NULL &&
5761 _GetModuleFileNameEx != NULL &&
5762 _GetModuleInformation != NULL;
5763 }
5764
5765
5766 // WinSock2 API
5767 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5768 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5769
5770 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5771 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5772 BOOL os::WinSock2Dll::initialized = FALSE;
5773
5774 void os::WinSock2Dll::initialize() {
5775 if (!initialized) {
5776 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5777 if (handle != NULL) {
5778 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5779 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5780 }
5781 initialized = TRUE;
5782 }
5783 }
5784
5785
5786 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5787 assert(initialized && _WSAStartup != NULL,
5788 "WinSock2Available() not yet called");
5789 return _WSAStartup(wVersionRequested, lpWSAData);
5790 }
5791
5792 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5793 assert(initialized && _gethostbyname != NULL,
5794 "WinSock2Available() not yet called");
5795 return _gethostbyname(name);
5796 }
5797
5798 BOOL os::WinSock2Dll::WinSock2Available() {
5799 if (!initialized) {
5800 initialize();
5801 }
5802 return _WSAStartup != NULL &&
5803 _gethostbyname != NULL;
5804 }
5805
5806 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5807 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5808 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5809
5810 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5811 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5812 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5813 BOOL os::Advapi32Dll::initialized = FALSE;
5814
5815 void os::Advapi32Dll::initialize() {
5816 if (!initialized) {
5817 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5818 if (handle != NULL) {
5819 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5820 "AdjustTokenPrivileges");
5821 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5822 "OpenProcessToken");
5823 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5824 "LookupPrivilegeValueA");
5825 }
5826 initialized = TRUE;
5827 }
5828 }
5829
5830 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5831 BOOL DisableAllPrivileges,
5832 PTOKEN_PRIVILEGES NewState,
5833 DWORD BufferLength,
5834 PTOKEN_PRIVILEGES PreviousState,
5835 PDWORD ReturnLength) {
5836 assert(initialized && _AdjustTokenPrivileges != NULL,
5837 "AdvapiAvailable() not yet called");
5838 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5839 BufferLength, PreviousState, ReturnLength);
5840 }
5841
5842 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5843 DWORD DesiredAccess,
5844 PHANDLE TokenHandle) {
5845 assert(initialized && _OpenProcessToken != NULL,
5846 "AdvapiAvailable() not yet called");
5847 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5848 }
5849
5850 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5851 LPCTSTR lpName, PLUID lpLuid) {
5852 assert(initialized && _LookupPrivilegeValue != NULL,
5853 "AdvapiAvailable() not yet called");
5854 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5855 }
5856
5857 BOOL os::Advapi32Dll::AdvapiAvailable() {
5858 if (!initialized) {
5859 initialize();
5860 }
5861 return _AdjustTokenPrivileges != NULL &&
5862 _OpenProcessToken != NULL &&
5863 _LookupPrivilegeValue != NULL;
5864 }
5865
5866 #endif
5867
5868 #ifndef PRODUCT
5869
5870 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5871 // contiguous memory block at a particular address.
5872 // The test first tries to find a good approximate address to allocate at by using the same
5873 // method to allocate some memory at any address. The test then tries to allocate memory in
5874 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5875 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5876 // the previously allocated memory is available for allocation. The only actual failure
5877 // that is reported is when the test tries to allocate at a particular location but gets a
5878 // different valid one. A NULL return value at this point is not considered an error but may
5879 // be legitimate.
5880 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5881 void TestReserveMemorySpecial_test() {
5882 if (!UseLargePages) {
5883 if (VerboseInternalVMTests) {
5884 gclog_or_tty->print("Skipping test because large pages are disabled");
5885 }
5886 return;
5887 }
5888 // save current value of globals
5889 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5890 bool old_use_numa_interleaving = UseNUMAInterleaving;
5891
5892 // set globals to make sure we hit the correct code path
5893 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5894
5895 // do an allocation at an address selected by the OS to get a good one.
5896 const size_t large_allocation_size = os::large_page_size() * 4;
5897 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5898 if (result == NULL) {
5899 if (VerboseInternalVMTests) {
5900 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5901 large_allocation_size);
5902 }
5903 } else {
5904 os::release_memory_special(result, large_allocation_size);
5905
5906 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5907 // we managed to get it once.
5908 const size_t expected_allocation_size = os::large_page_size();
5909 char* expected_location = result + os::large_page_size();
5910 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5911 if (actual_location == NULL) {
5912 if (VerboseInternalVMTests) {
5913 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5914 expected_location, large_allocation_size);
5915 }
5916 } else {
5917 // release memory
5918 os::release_memory_special(actual_location, expected_allocation_size);
5919 // only now check, after releasing any memory to avoid any leaks.
5920 assert(actual_location == expected_location,
5921 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5922 expected_location, expected_allocation_size, actual_location));
5923 }
5924 }
5925
5926 // restore globals
5927 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5928 UseNUMAInterleaving = old_use_numa_interleaving;
5929 }
5930 #endif // PRODUCT