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/semaphore.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 OSThread* osthr = thread->osthread();
423 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
424
425 if (UseNUMA) {
426 int lgrp_id = os::numa_get_group_id();
427 if (lgrp_id != -1) {
428 thread->set_lgrp_id(lgrp_id);
429 }
430 }
431
432 // Diagnostic code to investigate JDK-6573254
433 int res = 30115; // non-java thread
434 if (thread->is_Java_thread()) {
435 res = 20115; // java thread
436 }
437
438 // Install a win32 structured exception handler around every thread created
439 // by VM, so VM can generate error dump when an exception occurred in non-
440 // Java thread (e.g. VM thread).
441 __try {
442 thread->run();
443 } __except(topLevelExceptionFilter(
444 (_EXCEPTION_POINTERS*)_exception_info())) {
445 // Nothing to do.
446 }
447
448 // One less thread is executing
449 // When the VMThread gets here, the main thread may have already exited
450 // which frees the CodeHeap containing the Atomic::add code
451 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
452 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
453 }
454
455 // Thread must not return from exit_process_or_thread(), but if it does,
456 // let it proceed to exit normally
457 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
458 }
459
460 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
461 int thread_id) {
462 // Allocate the OSThread object
463 OSThread* osthread = new OSThread(NULL, NULL);
464 if (osthread == NULL) return NULL;
465
466 // Initialize support for Java interrupts
467 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
468 if (interrupt_event == NULL) {
469 delete osthread;
470 return NULL;
471 }
472 osthread->set_interrupt_event(interrupt_event);
473
474 // Store info on the Win32 thread into the OSThread
475 osthread->set_thread_handle(thread_handle);
476 osthread->set_thread_id(thread_id);
477
478 if (UseNUMA) {
479 int lgrp_id = os::numa_get_group_id();
480 if (lgrp_id != -1) {
481 thread->set_lgrp_id(lgrp_id);
482 }
483 }
484
485 // Initial thread state is INITIALIZED, not SUSPENDED
486 osthread->set_state(INITIALIZED);
487
488 return osthread;
489 }
490
491
492 bool os::create_attached_thread(JavaThread* thread) {
493 #ifdef ASSERT
494 thread->verify_not_published();
495 #endif
496 HANDLE thread_h;
497 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
498 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
499 fatal("DuplicateHandle failed\n");
500 }
501 OSThread* osthread = create_os_thread(thread, thread_h,
502 (int)current_thread_id());
503 if (osthread == NULL) {
504 return false;
505 }
506
507 // Initial thread state is RUNNABLE
508 osthread->set_state(RUNNABLE);
509
510 thread->set_osthread(osthread);
511 return true;
512 }
513
514 bool os::create_main_thread(JavaThread* thread) {
515 #ifdef ASSERT
516 thread->verify_not_published();
517 #endif
518 if (_starting_thread == NULL) {
519 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
520 if (_starting_thread == NULL) {
521 return false;
522 }
523 }
524
525 // The primordial thread is runnable from the start)
526 _starting_thread->set_state(RUNNABLE);
527
528 thread->set_osthread(_starting_thread);
529 return true;
530 }
531
532 // Allocate and initialize a new OSThread
533 bool os::create_thread(Thread* thread, ThreadType thr_type,
534 size_t stack_size) {
535 unsigned thread_id;
536
537 // Allocate the OSThread object
538 OSThread* osthread = new OSThread(NULL, NULL);
539 if (osthread == NULL) {
540 return false;
541 }
542
543 // Initialize support for Java interrupts
544 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
545 if (interrupt_event == NULL) {
546 delete osthread;
547 return NULL;
548 }
549 osthread->set_interrupt_event(interrupt_event);
550 osthread->set_interrupted(false);
551
552 thread->set_osthread(osthread);
553
554 if (stack_size == 0) {
555 switch (thr_type) {
556 case os::java_thread:
557 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
558 if (JavaThread::stack_size_at_create() > 0) {
559 stack_size = JavaThread::stack_size_at_create();
560 }
561 break;
562 case os::compiler_thread:
563 if (CompilerThreadStackSize > 0) {
564 stack_size = (size_t)(CompilerThreadStackSize * K);
565 break;
566 } // else fall through:
567 // use VMThreadStackSize if CompilerThreadStackSize is not defined
568 case os::vm_thread:
569 case os::pgc_thread:
570 case os::cgc_thread:
571 case os::watcher_thread:
572 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
573 break;
574 }
575 }
576
577 // Create the Win32 thread
578 //
579 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
580 // does not specify stack size. Instead, it specifies the size of
581 // initially committed space. The stack size is determined by
582 // PE header in the executable. If the committed "stack_size" is larger
583 // than default value in the PE header, the stack is rounded up to the
584 // nearest multiple of 1MB. For example if the launcher has default
585 // stack size of 320k, specifying any size less than 320k does not
586 // affect the actual stack size at all, it only affects the initial
587 // commitment. On the other hand, specifying 'stack_size' larger than
588 // default value may cause significant increase in memory usage, because
589 // not only the stack space will be rounded up to MB, but also the
590 // entire space is committed upfront.
591 //
592 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
593 // for CreateThread() that can treat 'stack_size' as stack size. However we
594 // are not supposed to call CreateThread() directly according to MSDN
595 // document because JVM uses C runtime library. The good news is that the
596 // flag appears to work with _beginthredex() as well.
597
598 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
599 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
600 #endif
601
602 HANDLE thread_handle =
603 (HANDLE)_beginthreadex(NULL,
604 (unsigned)stack_size,
605 (unsigned (__stdcall *)(void*)) java_start,
606 thread,
607 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
608 &thread_id);
609 if (thread_handle == NULL) {
610 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
611 // without the flag.
612 thread_handle =
613 (HANDLE)_beginthreadex(NULL,
614 (unsigned)stack_size,
615 (unsigned (__stdcall *)(void*)) java_start,
616 thread,
617 CREATE_SUSPENDED,
618 &thread_id);
619 }
620 if (thread_handle == NULL) {
621 // Need to clean up stuff we've allocated so far
622 CloseHandle(osthread->interrupt_event());
623 thread->set_osthread(NULL);
624 delete osthread;
625 return NULL;
626 }
627
628 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
629
630 // Store info on the Win32 thread into the OSThread
631 osthread->set_thread_handle(thread_handle);
632 osthread->set_thread_id(thread_id);
633
634 // Initial thread state is INITIALIZED, not SUSPENDED
635 osthread->set_state(INITIALIZED);
636
637 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
638 return true;
639 }
640
641
642 // Free Win32 resources related to the OSThread
643 void os::free_thread(OSThread* osthread) {
644 assert(osthread != NULL, "osthread not set");
645 CloseHandle(osthread->thread_handle());
646 CloseHandle(osthread->interrupt_event());
647 delete osthread;
648 }
649
650 static jlong first_filetime;
651 static jlong initial_performance_count;
652 static jlong performance_frequency;
653
654
655 jlong as_long(LARGE_INTEGER x) {
656 jlong result = 0; // initialization to avoid warning
657 set_high(&result, x.HighPart);
658 set_low(&result, x.LowPart);
659 return result;
660 }
661
662
663 jlong os::elapsed_counter() {
664 LARGE_INTEGER count;
665 if (win32::_has_performance_count) {
666 QueryPerformanceCounter(&count);
667 return as_long(count) - initial_performance_count;
668 } else {
669 FILETIME wt;
670 GetSystemTimeAsFileTime(&wt);
671 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
672 }
673 }
674
675
676 jlong os::elapsed_frequency() {
677 if (win32::_has_performance_count) {
678 return performance_frequency;
679 } else {
680 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
681 return 10000000;
682 }
683 }
684
685
686 julong os::available_memory() {
687 return win32::available_memory();
688 }
689
690 julong os::win32::available_memory() {
691 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
692 // value if total memory is larger than 4GB
693 MEMORYSTATUSEX ms;
694 ms.dwLength = sizeof(ms);
695 GlobalMemoryStatusEx(&ms);
696
697 return (julong)ms.ullAvailPhys;
698 }
699
700 julong os::physical_memory() {
701 return win32::physical_memory();
702 }
703
704 bool os::has_allocatable_memory_limit(julong* limit) {
705 MEMORYSTATUSEX ms;
706 ms.dwLength = sizeof(ms);
707 GlobalMemoryStatusEx(&ms);
708 #ifdef _LP64
709 *limit = (julong)ms.ullAvailVirtual;
710 return true;
711 #else
712 // Limit to 1400m because of the 2gb address space wall
713 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
714 return true;
715 #endif
716 }
717
718 // VC6 lacks DWORD_PTR
719 #if _MSC_VER < 1300
720 typedef UINT_PTR DWORD_PTR;
721 #endif
722
723 int os::active_processor_count() {
724 DWORD_PTR lpProcessAffinityMask = 0;
725 DWORD_PTR lpSystemAffinityMask = 0;
726 int proc_count = processor_count();
727 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
728 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
729 // Nof active processors is number of bits in process affinity mask
730 int bitcount = 0;
731 while (lpProcessAffinityMask != 0) {
732 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
733 bitcount++;
734 }
735 return bitcount;
736 } else {
737 return proc_count;
738 }
739 }
740
741 void os::set_native_thread_name(const char *name) {
742
743 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
744 //
745 // Note that unfortunately this only works if the process
746 // is already attached to a debugger; debugger must observe
747 // the exception below to show the correct name.
748
749 const DWORD MS_VC_EXCEPTION = 0x406D1388;
750 struct {
751 DWORD dwType; // must be 0x1000
752 LPCSTR szName; // pointer to name (in user addr space)
753 DWORD dwThreadID; // thread ID (-1=caller thread)
754 DWORD dwFlags; // reserved for future use, must be zero
755 } info;
756
757 info.dwType = 0x1000;
758 info.szName = name;
759 info.dwThreadID = -1;
760 info.dwFlags = 0;
761
762 __try {
763 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
764 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
765 }
766
767 bool os::distribute_processes(uint length, uint* distribution) {
768 // Not yet implemented.
769 return false;
770 }
771
772 bool os::bind_to_processor(uint processor_id) {
773 // Not yet implemented.
774 return false;
775 }
776
777 void os::win32::initialize_performance_counter() {
778 LARGE_INTEGER count;
779 if (QueryPerformanceFrequency(&count)) {
780 win32::_has_performance_count = 1;
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 } else {
785 win32::_has_performance_count = 0;
786 FILETIME wt;
787 GetSystemTimeAsFileTime(&wt);
788 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
789 }
790 }
791
792
793 double os::elapsedTime() {
794 return (double) elapsed_counter() / (double) elapsed_frequency();
795 }
796
797
798 // Windows format:
799 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
800 // Java format:
801 // Java standards require the number of milliseconds since 1/1/1970
802
803 // Constant offset - calculated using offset()
804 static jlong _offset = 116444736000000000;
805 // Fake time counter for reproducible results when debugging
806 static jlong fake_time = 0;
807
808 #ifdef ASSERT
809 // Just to be safe, recalculate the offset in debug mode
810 static jlong _calculated_offset = 0;
811 static int _has_calculated_offset = 0;
812
813 jlong offset() {
814 if (_has_calculated_offset) return _calculated_offset;
815 SYSTEMTIME java_origin;
816 java_origin.wYear = 1970;
817 java_origin.wMonth = 1;
818 java_origin.wDayOfWeek = 0; // ignored
819 java_origin.wDay = 1;
820 java_origin.wHour = 0;
821 java_origin.wMinute = 0;
822 java_origin.wSecond = 0;
823 java_origin.wMilliseconds = 0;
824 FILETIME jot;
825 if (!SystemTimeToFileTime(&java_origin, &jot)) {
826 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
827 }
828 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
829 _has_calculated_offset = 1;
830 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
831 return _calculated_offset;
832 }
833 #else
834 jlong offset() {
835 return _offset;
836 }
837 #endif
838
839 jlong windows_to_java_time(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset()) / 10000;
842 }
843
844 // Returns time ticks in (10th of micro seconds)
845 jlong windows_to_time_ticks(FILETIME wt) {
846 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
847 return (a - offset());
848 }
849
850 FILETIME java_to_windows_time(jlong l) {
851 jlong a = (l * 10000) + offset();
852 FILETIME result;
853 result.dwHighDateTime = high(a);
854 result.dwLowDateTime = low(a);
855 return result;
856 }
857
858 bool os::supports_vtime() { return true; }
859 bool os::enable_vtime() { return false; }
860 bool os::vtime_enabled() { return false; }
861
862 double os::elapsedVTime() {
863 FILETIME created;
864 FILETIME exited;
865 FILETIME kernel;
866 FILETIME user;
867 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
868 // the resolution of windows_to_java_time() should be sufficient (ms)
869 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
870 } else {
871 return elapsedTime();
872 }
873 }
874
875 jlong os::javaTimeMillis() {
876 if (UseFakeTimers) {
877 return fake_time++;
878 } else {
879 FILETIME wt;
880 GetSystemTimeAsFileTime(&wt);
881 return windows_to_java_time(wt);
882 }
883 }
884
885 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
886 FILETIME wt;
887 GetSystemTimeAsFileTime(&wt);
888 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
889 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
890 seconds = secs;
891 nanos = jlong(ticks - (secs*10000000)) * 100;
892 }
893
894 jlong os::javaTimeNanos() {
895 if (!win32::_has_performance_count) {
896 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
897 } else {
898 LARGE_INTEGER current_count;
899 QueryPerformanceCounter(¤t_count);
900 double current = as_long(current_count);
901 double freq = performance_frequency;
902 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
903 return time;
904 }
905 }
906
907 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
908 if (!win32::_has_performance_count) {
909 // javaTimeMillis() doesn't have much percision,
910 // but it is not going to wrap -- so all 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912
913 // this is a wall clock timer, so may skip
914 info_ptr->may_skip_backward = true;
915 info_ptr->may_skip_forward = true;
916 } else {
917 jlong freq = performance_frequency;
918 if (freq < NANOSECS_PER_SEC) {
919 // the performance counter is 64 bits and we will
920 // be multiplying it -- so no wrap in 64 bits
921 info_ptr->max_value = ALL_64_BITS;
922 } else if (freq > NANOSECS_PER_SEC) {
923 // use the max value the counter can reach to
924 // determine the max value which could be returned
925 julong max_counter = (julong)ALL_64_BITS;
926 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
927 } else {
928 // the performance counter is 64 bits and we will
929 // be using it directly -- so no wrap in 64 bits
930 info_ptr->max_value = ALL_64_BITS;
931 }
932
933 // using a counter, so no skipping
934 info_ptr->may_skip_backward = false;
935 info_ptr->may_skip_forward = false;
936 }
937 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
938 }
939
940 char* os::local_time_string(char *buf, size_t buflen) {
941 SYSTEMTIME st;
942 GetLocalTime(&st);
943 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
944 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
945 return buf;
946 }
947
948 bool os::getTimesSecs(double* process_real_time,
949 double* process_user_time,
950 double* process_system_time) {
951 HANDLE h_process = GetCurrentProcess();
952 FILETIME create_time, exit_time, kernel_time, user_time;
953 BOOL result = GetProcessTimes(h_process,
954 &create_time,
955 &exit_time,
956 &kernel_time,
957 &user_time);
958 if (result != 0) {
959 FILETIME wt;
960 GetSystemTimeAsFileTime(&wt);
961 jlong rtc_millis = windows_to_java_time(wt);
962 jlong user_millis = windows_to_java_time(user_time);
963 jlong system_millis = windows_to_java_time(kernel_time);
964 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
965 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
966 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
967 return true;
968 } else {
969 return false;
970 }
971 }
972
973 void os::shutdown() {
974 // allow PerfMemory to attempt cleanup of any persistent resources
975 perfMemory_exit();
976
977 // flush buffered output, finish log files
978 ostream_abort();
979
980 // Check for abort hook
981 abort_hook_t abort_hook = Arguments::abort_hook();
982 if (abort_hook != NULL) {
983 abort_hook();
984 }
985 }
986
987
988 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
989 PMINIDUMP_EXCEPTION_INFORMATION,
990 PMINIDUMP_USER_STREAM_INFORMATION,
991 PMINIDUMP_CALLBACK_INFORMATION);
992
993 static HANDLE dumpFile = NULL;
994
995 // Check if dump file can be created.
996 void os::check_dump_limit(char* buffer, size_t buffsz) {
997 bool status = true;
998 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
999 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1000 status = false;
1001 } else {
1002 const char* cwd = get_current_directory(NULL, 0);
1003 int pid = current_process_id();
1004 if (cwd != NULL) {
1005 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1006 } else {
1007 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1008 }
1009
1010 if (dumpFile == NULL &&
1011 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1012 == INVALID_HANDLE_VALUE) {
1013 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1014 status = false;
1015 }
1016 }
1017 VMError::record_coredump_status(buffer, status);
1018 }
1019
1020 void os::abort(bool dump_core, void* siginfo, void* context) {
1021 HINSTANCE dbghelp;
1022 EXCEPTION_POINTERS ep;
1023 MINIDUMP_EXCEPTION_INFORMATION mei;
1024 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1025
1026 HANDLE hProcess = GetCurrentProcess();
1027 DWORD processId = GetCurrentProcessId();
1028 MINIDUMP_TYPE dumpType;
1029
1030 shutdown();
1031 if (!dump_core || dumpFile == NULL) {
1032 if (dumpFile != NULL) {
1033 CloseHandle(dumpFile);
1034 }
1035 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1036 }
1037
1038 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1039
1040 if (dbghelp == NULL) {
1041 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1042 CloseHandle(dumpFile);
1043 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1044 }
1045
1046 _MiniDumpWriteDump =
1047 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1048 PMINIDUMP_EXCEPTION_INFORMATION,
1049 PMINIDUMP_USER_STREAM_INFORMATION,
1050 PMINIDUMP_CALLBACK_INFORMATION),
1051 GetProcAddress(dbghelp,
1052 "MiniDumpWriteDump"));
1053
1054 if (_MiniDumpWriteDump == NULL) {
1055 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1056 CloseHandle(dumpFile);
1057 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1058 }
1059
1060 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1061
1062 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1063 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1064 #if API_VERSION_NUMBER >= 11
1065 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1066 MiniDumpWithUnloadedModules);
1067 #endif
1068
1069 if (siginfo != NULL && context != NULL) {
1070 ep.ContextRecord = (PCONTEXT) context;
1071 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1072
1073 mei.ThreadId = GetCurrentThreadId();
1074 mei.ExceptionPointers = &ep;
1075 pmei = &mei;
1076 } else {
1077 pmei = NULL;
1078 }
1079
1080 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1081 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1082 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1083 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1084 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1085 }
1086 CloseHandle(dumpFile);
1087 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1088 }
1089
1090 void os::abort(bool dump_core) {
1091 abort(dump_core, NULL, NULL);
1092 }
1093
1094 // Die immediately, no exit hook, no abort hook, no cleanup.
1095 void os::die() {
1096 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1097 }
1098
1099 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1100 // * dirent_md.c 1.15 00/02/02
1101 //
1102 // The declarations for DIR and struct dirent are in jvm_win32.h.
1103
1104 // Caller must have already run dirname through JVM_NativePath, which removes
1105 // duplicate slashes and converts all instances of '/' into '\\'.
1106
1107 DIR * os::opendir(const char *dirname) {
1108 assert(dirname != NULL, "just checking"); // hotspot change
1109 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1110 DWORD fattr; // hotspot change
1111 char alt_dirname[4] = { 0, 0, 0, 0 };
1112
1113 if (dirp == 0) {
1114 errno = ENOMEM;
1115 return 0;
1116 }
1117
1118 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1119 // as a directory in FindFirstFile(). We detect this case here and
1120 // prepend the current drive name.
1121 //
1122 if (dirname[1] == '\0' && dirname[0] == '\\') {
1123 alt_dirname[0] = _getdrive() + 'A' - 1;
1124 alt_dirname[1] = ':';
1125 alt_dirname[2] = '\\';
1126 alt_dirname[3] = '\0';
1127 dirname = alt_dirname;
1128 }
1129
1130 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1131 if (dirp->path == 0) {
1132 free(dirp);
1133 errno = ENOMEM;
1134 return 0;
1135 }
1136 strcpy(dirp->path, dirname);
1137
1138 fattr = GetFileAttributes(dirp->path);
1139 if (fattr == 0xffffffff) {
1140 free(dirp->path);
1141 free(dirp);
1142 errno = ENOENT;
1143 return 0;
1144 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOTDIR;
1148 return 0;
1149 }
1150
1151 // Append "*.*", or possibly "\\*.*", to path
1152 if (dirp->path[1] == ':' &&
1153 (dirp->path[2] == '\0' ||
1154 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1155 // No '\\' needed for cases like "Z:" or "Z:\"
1156 strcat(dirp->path, "*.*");
1157 } else {
1158 strcat(dirp->path, "\\*.*");
1159 }
1160
1161 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1162 if (dirp->handle == INVALID_HANDLE_VALUE) {
1163 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1164 free(dirp->path);
1165 free(dirp);
1166 errno = EACCES;
1167 return 0;
1168 }
1169 }
1170 return dirp;
1171 }
1172
1173 // parameter dbuf unused on Windows
1174 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1175 assert(dirp != NULL, "just checking"); // hotspot change
1176 if (dirp->handle == INVALID_HANDLE_VALUE) {
1177 return 0;
1178 }
1179
1180 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1181
1182 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1183 if (GetLastError() == ERROR_INVALID_HANDLE) {
1184 errno = EBADF;
1185 return 0;
1186 }
1187 FindClose(dirp->handle);
1188 dirp->handle = INVALID_HANDLE_VALUE;
1189 }
1190
1191 return &dirp->dirent;
1192 }
1193
1194 int os::closedir(DIR *dirp) {
1195 assert(dirp != NULL, "just checking"); // hotspot change
1196 if (dirp->handle != INVALID_HANDLE_VALUE) {
1197 if (!FindClose(dirp->handle)) {
1198 errno = EBADF;
1199 return -1;
1200 }
1201 dirp->handle = INVALID_HANDLE_VALUE;
1202 }
1203 free(dirp->path);
1204 free(dirp);
1205 return 0;
1206 }
1207
1208 // This must be hard coded because it's the system's temporary
1209 // directory not the java application's temp directory, ala java.io.tmpdir.
1210 const char* os::get_temp_directory() {
1211 static char path_buf[MAX_PATH];
1212 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1213 return path_buf;
1214 } else {
1215 path_buf[0] = '\0';
1216 return path_buf;
1217 }
1218 }
1219
1220 static bool file_exists(const char* filename) {
1221 if (filename == NULL || strlen(filename) == 0) {
1222 return false;
1223 }
1224 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1225 }
1226
1227 bool os::dll_build_name(char *buffer, size_t buflen,
1228 const char* pname, const char* fname) {
1229 bool retval = false;
1230 const size_t pnamelen = pname ? strlen(pname) : 0;
1231 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1232
1233 // Return error on buffer overflow.
1234 if (pnamelen + strlen(fname) + 10 > buflen) {
1235 return retval;
1236 }
1237
1238 if (pnamelen == 0) {
1239 jio_snprintf(buffer, buflen, "%s.dll", fname);
1240 retval = true;
1241 } else if (c == ':' || c == '\\') {
1242 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1243 retval = true;
1244 } else if (strchr(pname, *os::path_separator()) != NULL) {
1245 int n;
1246 char** pelements = split_path(pname, &n);
1247 if (pelements == NULL) {
1248 return false;
1249 }
1250 for (int i = 0; i < n; i++) {
1251 char* path = pelements[i];
1252 // Really shouldn't be NULL, but check can't hurt
1253 size_t plen = (path == NULL) ? 0 : strlen(path);
1254 if (plen == 0) {
1255 continue; // skip the empty path values
1256 }
1257 const char lastchar = path[plen - 1];
1258 if (lastchar == ':' || lastchar == '\\') {
1259 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1260 } else {
1261 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1262 }
1263 if (file_exists(buffer)) {
1264 retval = true;
1265 break;
1266 }
1267 }
1268 // release the storage
1269 for (int i = 0; i < n; i++) {
1270 if (pelements[i] != NULL) {
1271 FREE_C_HEAP_ARRAY(char, pelements[i]);
1272 }
1273 }
1274 if (pelements != NULL) {
1275 FREE_C_HEAP_ARRAY(char*, pelements);
1276 }
1277 } else {
1278 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1279 retval = true;
1280 }
1281 return retval;
1282 }
1283
1284 // Needs to be in os specific directory because windows requires another
1285 // header file <direct.h>
1286 const char* os::get_current_directory(char *buf, size_t buflen) {
1287 int n = static_cast<int>(buflen);
1288 if (buflen > INT_MAX) n = INT_MAX;
1289 return _getcwd(buf, n);
1290 }
1291
1292 //-----------------------------------------------------------
1293 // Helper functions for fatal error handler
1294 #ifdef _WIN64
1295 // Helper routine which returns true if address in
1296 // within the NTDLL address space.
1297 //
1298 static bool _addr_in_ntdll(address addr) {
1299 HMODULE hmod;
1300 MODULEINFO minfo;
1301
1302 hmod = GetModuleHandle("NTDLL.DLL");
1303 if (hmod == NULL) return false;
1304 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1305 &minfo, sizeof(MODULEINFO))) {
1306 return false;
1307 }
1308
1309 if ((addr >= minfo.lpBaseOfDll) &&
1310 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1311 return true;
1312 } else {
1313 return false;
1314 }
1315 }
1316 #endif
1317
1318 struct _modinfo {
1319 address addr;
1320 char* full_path; // point to a char buffer
1321 int buflen; // size of the buffer
1322 address base_addr;
1323 };
1324
1325 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1326 address top_address, void * param) {
1327 struct _modinfo *pmod = (struct _modinfo *)param;
1328 if (!pmod) return -1;
1329
1330 if (base_addr <= pmod->addr &&
1331 top_address > pmod->addr) {
1332 // if a buffer is provided, copy path name to the buffer
1333 if (pmod->full_path) {
1334 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1335 }
1336 pmod->base_addr = base_addr;
1337 return 1;
1338 }
1339 return 0;
1340 }
1341
1342 bool os::dll_address_to_library_name(address addr, char* buf,
1343 int buflen, int* offset) {
1344 // buf is not optional, but offset is optional
1345 assert(buf != NULL, "sanity check");
1346
1347 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1348 // return the full path to the DLL file, sometimes it returns path
1349 // to the corresponding PDB file (debug info); sometimes it only
1350 // returns partial path, which makes life painful.
1351
1352 struct _modinfo mi;
1353 mi.addr = addr;
1354 mi.full_path = buf;
1355 mi.buflen = buflen;
1356 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1357 // buf already contains path name
1358 if (offset) *offset = addr - mi.base_addr;
1359 return true;
1360 }
1361
1362 buf[0] = '\0';
1363 if (offset) *offset = -1;
1364 return false;
1365 }
1366
1367 bool os::dll_address_to_function_name(address addr, char *buf,
1368 int buflen, int *offset) {
1369 // buf is not optional, but offset is optional
1370 assert(buf != NULL, "sanity check");
1371
1372 if (Decoder::decode(addr, buf, buflen, offset)) {
1373 return true;
1374 }
1375 if (offset != NULL) *offset = -1;
1376 buf[0] = '\0';
1377 return false;
1378 }
1379
1380 // save the start and end address of jvm.dll into param[0] and param[1]
1381 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1382 address top_address, void * param) {
1383 if (!param) return -1;
1384
1385 if (base_addr <= (address)_locate_jvm_dll &&
1386 top_address > (address)_locate_jvm_dll) {
1387 ((address*)param)[0] = base_addr;
1388 ((address*)param)[1] = top_address;
1389 return 1;
1390 }
1391 return 0;
1392 }
1393
1394 address vm_lib_location[2]; // start and end address of jvm.dll
1395
1396 // check if addr is inside jvm.dll
1397 bool os::address_is_in_vm(address addr) {
1398 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1399 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1400 assert(false, "Can't find jvm module.");
1401 return false;
1402 }
1403 }
1404
1405 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1406 }
1407
1408 // print module info; param is outputStream*
1409 static int _print_module(const char* fname, address base_address,
1410 address top_address, void* param) {
1411 if (!param) return -1;
1412
1413 outputStream* st = (outputStream*)param;
1414
1415 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1416 return 0;
1417 }
1418
1419 // Loads .dll/.so and
1420 // in case of error it checks if .dll/.so was built for the
1421 // same architecture as Hotspot is running on
1422 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1423 void * result = LoadLibrary(name);
1424 if (result != NULL) {
1425 return result;
1426 }
1427
1428 DWORD errcode = GetLastError();
1429 if (errcode == ERROR_MOD_NOT_FOUND) {
1430 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1431 ebuf[ebuflen - 1] = '\0';
1432 return NULL;
1433 }
1434
1435 // Parsing dll below
1436 // If we can read dll-info and find that dll was built
1437 // for an architecture other than Hotspot is running in
1438 // - then print to buffer "DLL was built for a different architecture"
1439 // else call os::lasterror to obtain system error message
1440
1441 // Read system error message into ebuf
1442 // It may or may not be overwritten below (in the for loop and just above)
1443 lasterror(ebuf, (size_t) ebuflen);
1444 ebuf[ebuflen - 1] = '\0';
1445 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1446 if (fd < 0) {
1447 return NULL;
1448 }
1449
1450 uint32_t signature_offset;
1451 uint16_t lib_arch = 0;
1452 bool failed_to_get_lib_arch =
1453 ( // Go to position 3c in the dll
1454 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1455 ||
1456 // Read location of signature
1457 (sizeof(signature_offset) !=
1458 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1459 ||
1460 // Go to COFF File Header in dll
1461 // that is located after "signature" (4 bytes long)
1462 (os::seek_to_file_offset(fd,
1463 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1464 ||
1465 // Read field that contains code of architecture
1466 // that dll was built for
1467 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1468 );
1469
1470 ::close(fd);
1471 if (failed_to_get_lib_arch) {
1472 // file i/o error - report os::lasterror(...) msg
1473 return NULL;
1474 }
1475
1476 typedef struct {
1477 uint16_t arch_code;
1478 char* arch_name;
1479 } arch_t;
1480
1481 static const arch_t arch_array[] = {
1482 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1483 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1484 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1485 };
1486 #if (defined _M_IA64)
1487 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1488 #elif (defined _M_AMD64)
1489 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1490 #elif (defined _M_IX86)
1491 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1492 #else
1493 #error Method os::dll_load requires that one of following \
1494 is defined :_M_IA64,_M_AMD64 or _M_IX86
1495 #endif
1496
1497
1498 // Obtain a string for printf operation
1499 // lib_arch_str shall contain string what platform this .dll was built for
1500 // running_arch_str shall string contain what platform Hotspot was built for
1501 char *running_arch_str = NULL, *lib_arch_str = NULL;
1502 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1503 if (lib_arch == arch_array[i].arch_code) {
1504 lib_arch_str = arch_array[i].arch_name;
1505 }
1506 if (running_arch == arch_array[i].arch_code) {
1507 running_arch_str = arch_array[i].arch_name;
1508 }
1509 }
1510
1511 assert(running_arch_str,
1512 "Didn't find running architecture code in arch_array");
1513
1514 // If the architecture is right
1515 // but some other error took place - report os::lasterror(...) msg
1516 if (lib_arch == running_arch) {
1517 return NULL;
1518 }
1519
1520 if (lib_arch_str != NULL) {
1521 ::_snprintf(ebuf, ebuflen - 1,
1522 "Can't load %s-bit .dll on a %s-bit platform",
1523 lib_arch_str, running_arch_str);
1524 } else {
1525 // don't know what architecture this dll was build for
1526 ::_snprintf(ebuf, ebuflen - 1,
1527 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1528 lib_arch, running_arch_str);
1529 }
1530
1531 return NULL;
1532 }
1533
1534 void os::print_dll_info(outputStream *st) {
1535 st->print_cr("Dynamic libraries:");
1536 get_loaded_modules_info(_print_module, (void *)st);
1537 }
1538
1539 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1540 HANDLE hProcess;
1541
1542 # define MAX_NUM_MODULES 128
1543 HMODULE modules[MAX_NUM_MODULES];
1544 static char filename[MAX_PATH];
1545 int result = 0;
1546
1547 if (!os::PSApiDll::PSApiAvailable()) {
1548 return 0;
1549 }
1550
1551 int pid = os::current_process_id();
1552 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1553 FALSE, pid);
1554 if (hProcess == NULL) return 0;
1555
1556 DWORD size_needed;
1557 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1558 sizeof(modules), &size_needed)) {
1559 CloseHandle(hProcess);
1560 return 0;
1561 }
1562
1563 // number of modules that are currently loaded
1564 int num_modules = size_needed / sizeof(HMODULE);
1565
1566 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1567 // Get Full pathname:
1568 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1569 filename, sizeof(filename))) {
1570 filename[0] = '\0';
1571 }
1572
1573 MODULEINFO modinfo;
1574 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1575 &modinfo, sizeof(modinfo))) {
1576 modinfo.lpBaseOfDll = NULL;
1577 modinfo.SizeOfImage = 0;
1578 }
1579
1580 // Invoke callback function
1581 result = callback(filename, (address)modinfo.lpBaseOfDll,
1582 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1583 if (result) break;
1584 }
1585
1586 CloseHandle(hProcess);
1587 return result;
1588 }
1589
1590 void os::print_os_info_brief(outputStream* st) {
1591 os::print_os_info(st);
1592 }
1593
1594 void os::print_os_info(outputStream* st) {
1595 #ifdef ASSERT
1596 char buffer[1024];
1597 DWORD size = sizeof(buffer);
1598 st->print(" HostName: ");
1599 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1600 st->print("%s", buffer);
1601 } else {
1602 st->print("N/A");
1603 }
1604 #endif
1605 st->print(" OS:");
1606 os::win32::print_windows_version(st);
1607 }
1608
1609 void os::win32::print_windows_version(outputStream* st) {
1610 OSVERSIONINFOEX osvi;
1611 VS_FIXEDFILEINFO *file_info;
1612 TCHAR kernel32_path[MAX_PATH];
1613 UINT len, ret;
1614
1615 // Use the GetVersionEx information to see if we're on a server or
1616 // workstation edition of Windows. Starting with Windows 8.1 we can't
1617 // trust the OS version information returned by this API.
1618 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1619 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1620 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1621 st->print_cr("Call to GetVersionEx failed");
1622 return;
1623 }
1624 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1625
1626 // Get the full path to \Windows\System32\kernel32.dll and use that for
1627 // determining what version of Windows we're running on.
1628 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1629 ret = GetSystemDirectory(kernel32_path, len);
1630 if (ret == 0 || ret > len) {
1631 st->print_cr("Call to GetSystemDirectory failed");
1632 return;
1633 }
1634 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1635
1636 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1637 if (version_size == 0) {
1638 st->print_cr("Call to GetFileVersionInfoSize failed");
1639 return;
1640 }
1641
1642 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1643 if (version_info == NULL) {
1644 st->print_cr("Failed to allocate version_info");
1645 return;
1646 }
1647
1648 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1649 os::free(version_info);
1650 st->print_cr("Call to GetFileVersionInfo failed");
1651 return;
1652 }
1653
1654 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1655 os::free(version_info);
1656 st->print_cr("Call to VerQueryValue failed");
1657 return;
1658 }
1659
1660 int major_version = HIWORD(file_info->dwProductVersionMS);
1661 int minor_version = LOWORD(file_info->dwProductVersionMS);
1662 int build_number = HIWORD(file_info->dwProductVersionLS);
1663 int build_minor = LOWORD(file_info->dwProductVersionLS);
1664 int os_vers = major_version * 1000 + minor_version;
1665 os::free(version_info);
1666
1667 st->print(" Windows ");
1668 switch (os_vers) {
1669
1670 case 6000:
1671 if (is_workstation) {
1672 st->print("Vista");
1673 } else {
1674 st->print("Server 2008");
1675 }
1676 break;
1677
1678 case 6001:
1679 if (is_workstation) {
1680 st->print("7");
1681 } else {
1682 st->print("Server 2008 R2");
1683 }
1684 break;
1685
1686 case 6002:
1687 if (is_workstation) {
1688 st->print("8");
1689 } else {
1690 st->print("Server 2012");
1691 }
1692 break;
1693
1694 case 6003:
1695 if (is_workstation) {
1696 st->print("8.1");
1697 } else {
1698 st->print("Server 2012 R2");
1699 }
1700 break;
1701
1702 case 10000:
1703 if (is_workstation) {
1704 st->print("10");
1705 } else {
1706 // The server version name of Windows 10 is not known at this time
1707 st->print("%d.%d", major_version, minor_version);
1708 }
1709 break;
1710
1711 default:
1712 // Unrecognized windows, print out its major and minor versions
1713 st->print("%d.%d", major_version, minor_version);
1714 break;
1715 }
1716
1717 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1718 // find out whether we are running on 64 bit processor or not
1719 SYSTEM_INFO si;
1720 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1721 os::Kernel32Dll::GetNativeSystemInfo(&si);
1722 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1723 st->print(" , 64 bit");
1724 }
1725
1726 st->print(" Build %d", build_number);
1727 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1728 st->cr();
1729 }
1730
1731 void os::pd_print_cpu_info(outputStream* st) {
1732 // Nothing to do for now.
1733 }
1734
1735 void os::print_memory_info(outputStream* st) {
1736 st->print("Memory:");
1737 st->print(" %dk page", os::vm_page_size()>>10);
1738
1739 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1740 // value if total memory is larger than 4GB
1741 MEMORYSTATUSEX ms;
1742 ms.dwLength = sizeof(ms);
1743 GlobalMemoryStatusEx(&ms);
1744
1745 st->print(", physical %uk", os::physical_memory() >> 10);
1746 st->print("(%uk free)", os::available_memory() >> 10);
1747
1748 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1749 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1750 st->cr();
1751 }
1752
1753 void os::print_siginfo(outputStream *st, void *siginfo) {
1754 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1755 st->print("siginfo:");
1756 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1757
1758 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1759 er->NumberParameters >= 2) {
1760 switch (er->ExceptionInformation[0]) {
1761 case 0: st->print(", reading address"); break;
1762 case 1: st->print(", writing address"); break;
1763 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1764 er->ExceptionInformation[0]);
1765 }
1766 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1767 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1768 er->NumberParameters >= 2 && UseSharedSpaces) {
1769 FileMapInfo* mapinfo = FileMapInfo::current_info();
1770 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1771 st->print("\n\nError accessing class data sharing archive." \
1772 " Mapped file inaccessible during execution, " \
1773 " possible disk/network problem.");
1774 }
1775 } else {
1776 int num = er->NumberParameters;
1777 if (num > 0) {
1778 st->print(", ExceptionInformation=");
1779 for (int i = 0; i < num; i++) {
1780 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1781 }
1782 }
1783 }
1784 st->cr();
1785 }
1786
1787 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1788 // do nothing
1789 }
1790
1791 static char saved_jvm_path[MAX_PATH] = {0};
1792
1793 // Find the full path to the current module, jvm.dll
1794 void os::jvm_path(char *buf, jint buflen) {
1795 // Error checking.
1796 if (buflen < MAX_PATH) {
1797 assert(false, "must use a large-enough buffer");
1798 buf[0] = '\0';
1799 return;
1800 }
1801 // Lazy resolve the path to current module.
1802 if (saved_jvm_path[0] != 0) {
1803 strcpy(buf, saved_jvm_path);
1804 return;
1805 }
1806
1807 buf[0] = '\0';
1808 if (Arguments::sun_java_launcher_is_altjvm()) {
1809 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1810 // for a JAVA_HOME environment variable and fix up the path so it
1811 // looks like jvm.dll is installed there (append a fake suffix
1812 // hotspot/jvm.dll).
1813 char* java_home_var = ::getenv("JAVA_HOME");
1814 if (java_home_var != NULL && java_home_var[0] != 0 &&
1815 strlen(java_home_var) < (size_t)buflen) {
1816 strncpy(buf, java_home_var, buflen);
1817
1818 // determine if this is a legacy image or modules image
1819 // modules image doesn't have "jre" subdirectory
1820 size_t len = strlen(buf);
1821 char* jrebin_p = buf + len;
1822 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1823 if (0 != _access(buf, 0)) {
1824 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1825 }
1826 len = strlen(buf);
1827 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1828 }
1829 }
1830
1831 if (buf[0] == '\0') {
1832 GetModuleFileName(vm_lib_handle, buf, buflen);
1833 }
1834 strncpy(saved_jvm_path, buf, MAX_PATH);
1835 saved_jvm_path[MAX_PATH - 1] = '\0';
1836 }
1837
1838
1839 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1840 #ifndef _WIN64
1841 st->print("_");
1842 #endif
1843 }
1844
1845
1846 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1847 #ifndef _WIN64
1848 st->print("@%d", args_size * sizeof(int));
1849 #endif
1850 }
1851
1852 // This method is a copy of JDK's sysGetLastErrorString
1853 // from src/windows/hpi/src/system_md.c
1854
1855 size_t os::lasterror(char* buf, size_t len) {
1856 DWORD errval;
1857
1858 if ((errval = GetLastError()) != 0) {
1859 // DOS error
1860 size_t n = (size_t)FormatMessage(
1861 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1862 NULL,
1863 errval,
1864 0,
1865 buf,
1866 (DWORD)len,
1867 NULL);
1868 if (n > 3) {
1869 // Drop final '.', CR, LF
1870 if (buf[n - 1] == '\n') n--;
1871 if (buf[n - 1] == '\r') n--;
1872 if (buf[n - 1] == '.') n--;
1873 buf[n] = '\0';
1874 }
1875 return n;
1876 }
1877
1878 if (errno != 0) {
1879 // C runtime error that has no corresponding DOS error code
1880 const char* s = strerror(errno);
1881 size_t n = strlen(s);
1882 if (n >= len) n = len - 1;
1883 strncpy(buf, s, n);
1884 buf[n] = '\0';
1885 return n;
1886 }
1887
1888 return 0;
1889 }
1890
1891 int os::get_last_error() {
1892 DWORD error = GetLastError();
1893 if (error == 0) {
1894 error = errno;
1895 }
1896 return (int)error;
1897 }
1898
1899 Semaphore::Semaphore(uint value) {
1900 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1901
1902 assert(_semaphore != NULL, err_msg("CreateSemaphore failed: %ld", GetLastError()));
1903 }
1904
1905 Semaphore::~Semaphore() {
1906 if (_semaphore != NULL) {
1907 ::CloseHandle(_semaphore);
1908 }
1909 }
1910
1911 void Semaphore::signal(uint count) {
1912 if (count > 0) {
1913 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1914
1915 assert(ret != 0, err_msg("ReleaseSemaphore failed: %d", GetLastError()));
1916 }
1917 }
1918
1919 void Semaphore::wait() {
1920 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1921 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed: %d", GetLastError()));
1922 }
1923
1924 // sun.misc.Signal
1925 // NOTE that this is a workaround for an apparent kernel bug where if
1926 // a signal handler for SIGBREAK is installed then that signal handler
1927 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1928 // See bug 4416763.
1929 static void (*sigbreakHandler)(int) = NULL;
1930
1931 static void UserHandler(int sig, void *siginfo, void *context) {
1932 os::signal_notify(sig);
1933 // We need to reinstate the signal handler each time...
1934 os::signal(sig, (void*)UserHandler);
1935 }
1936
1937 void* os::user_handler() {
1938 return (void*) UserHandler;
1939 }
1940
1941 void* os::signal(int signal_number, void* handler) {
1942 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1943 void (*oldHandler)(int) = sigbreakHandler;
1944 sigbreakHandler = (void (*)(int)) handler;
1945 return (void*) oldHandler;
1946 } else {
1947 return (void*)::signal(signal_number, (void (*)(int))handler);
1948 }
1949 }
1950
1951 void os::signal_raise(int signal_number) {
1952 raise(signal_number);
1953 }
1954
1955 // The Win32 C runtime library maps all console control events other than ^C
1956 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1957 // logoff, and shutdown events. We therefore install our own console handler
1958 // that raises SIGTERM for the latter cases.
1959 //
1960 static BOOL WINAPI consoleHandler(DWORD event) {
1961 switch (event) {
1962 case CTRL_C_EVENT:
1963 if (is_error_reported()) {
1964 // Ctrl-C is pressed during error reporting, likely because the error
1965 // handler fails to abort. Let VM die immediately.
1966 os::die();
1967 }
1968
1969 os::signal_raise(SIGINT);
1970 return TRUE;
1971 break;
1972 case CTRL_BREAK_EVENT:
1973 if (sigbreakHandler != NULL) {
1974 (*sigbreakHandler)(SIGBREAK);
1975 }
1976 return TRUE;
1977 break;
1978 case CTRL_LOGOFF_EVENT: {
1979 // Don't terminate JVM if it is running in a non-interactive session,
1980 // such as a service process.
1981 USEROBJECTFLAGS flags;
1982 HANDLE handle = GetProcessWindowStation();
1983 if (handle != NULL &&
1984 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1985 sizeof(USEROBJECTFLAGS), NULL)) {
1986 // If it is a non-interactive session, let next handler to deal
1987 // with it.
1988 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1989 return FALSE;
1990 }
1991 }
1992 }
1993 case CTRL_CLOSE_EVENT:
1994 case CTRL_SHUTDOWN_EVENT:
1995 os::signal_raise(SIGTERM);
1996 return TRUE;
1997 break;
1998 default:
1999 break;
2000 }
2001 return FALSE;
2002 }
2003
2004 // The following code is moved from os.cpp for making this
2005 // code platform specific, which it is by its very nature.
2006
2007 // Return maximum OS signal used + 1 for internal use only
2008 // Used as exit signal for signal_thread
2009 int os::sigexitnum_pd() {
2010 return NSIG;
2011 }
2012
2013 // a counter for each possible signal value, including signal_thread exit signal
2014 static volatile jint pending_signals[NSIG+1] = { 0 };
2015 static HANDLE sig_sem = NULL;
2016
2017 void os::signal_init_pd() {
2018 // Initialize signal structures
2019 memset((void*)pending_signals, 0, sizeof(pending_signals));
2020
2021 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2022
2023 // Programs embedding the VM do not want it to attempt to receive
2024 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2025 // shutdown hooks mechanism introduced in 1.3. For example, when
2026 // the VM is run as part of a Windows NT service (i.e., a servlet
2027 // engine in a web server), the correct behavior is for any console
2028 // control handler to return FALSE, not TRUE, because the OS's
2029 // "final" handler for such events allows the process to continue if
2030 // it is a service (while terminating it if it is not a service).
2031 // To make this behavior uniform and the mechanism simpler, we
2032 // completely disable the VM's usage of these console events if -Xrs
2033 // (=ReduceSignalUsage) is specified. This means, for example, that
2034 // the CTRL-BREAK thread dump mechanism is also disabled in this
2035 // case. See bugs 4323062, 4345157, and related bugs.
2036
2037 if (!ReduceSignalUsage) {
2038 // Add a CTRL-C handler
2039 SetConsoleCtrlHandler(consoleHandler, TRUE);
2040 }
2041 }
2042
2043 void os::signal_notify(int signal_number) {
2044 BOOL ret;
2045 if (sig_sem != NULL) {
2046 Atomic::inc(&pending_signals[signal_number]);
2047 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2048 assert(ret != 0, "ReleaseSemaphore() failed");
2049 }
2050 }
2051
2052 static int check_pending_signals(bool wait_for_signal) {
2053 DWORD ret;
2054 while (true) {
2055 for (int i = 0; i < NSIG + 1; i++) {
2056 jint n = pending_signals[i];
2057 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2058 return i;
2059 }
2060 }
2061 if (!wait_for_signal) {
2062 return -1;
2063 }
2064
2065 JavaThread *thread = JavaThread::current();
2066
2067 ThreadBlockInVM tbivm(thread);
2068
2069 bool threadIsSuspended;
2070 do {
2071 thread->set_suspend_equivalent();
2072 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2073 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2074 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2075
2076 // were we externally suspended while we were waiting?
2077 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2078 if (threadIsSuspended) {
2079 // The semaphore has been incremented, but while we were waiting
2080 // another thread suspended us. We don't want to continue running
2081 // while suspended because that would surprise the thread that
2082 // suspended us.
2083 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2084 assert(ret != 0, "ReleaseSemaphore() failed");
2085
2086 thread->java_suspend_self();
2087 }
2088 } while (threadIsSuspended);
2089 }
2090 }
2091
2092 int os::signal_lookup() {
2093 return check_pending_signals(false);
2094 }
2095
2096 int os::signal_wait() {
2097 return check_pending_signals(true);
2098 }
2099
2100 // Implicit OS exception handling
2101
2102 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2103 address handler) {
2104 JavaThread* thread = JavaThread::current();
2105 // Save pc in thread
2106 #ifdef _M_IA64
2107 // Do not blow up if no thread info available.
2108 if (thread) {
2109 // Saving PRECISE pc (with slot information) in thread.
2110 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2111 // Convert precise PC into "Unix" format
2112 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2113 thread->set_saved_exception_pc((address)precise_pc);
2114 }
2115 // Set pc to handler
2116 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2117 // Clear out psr.ri (= Restart Instruction) in order to continue
2118 // at the beginning of the target bundle.
2119 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2120 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2121 #else
2122 #ifdef _M_AMD64
2123 // Do not blow up if no thread info available.
2124 if (thread) {
2125 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2126 }
2127 // Set pc to handler
2128 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2129 #else
2130 // Do not blow up if no thread info available.
2131 if (thread) {
2132 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2133 }
2134 // Set pc to handler
2135 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2136 #endif
2137 #endif
2138
2139 // Continue the execution
2140 return EXCEPTION_CONTINUE_EXECUTION;
2141 }
2142
2143
2144 // Used for PostMortemDump
2145 extern "C" void safepoints();
2146 extern "C" void find(int x);
2147 extern "C" void events();
2148
2149 // According to Windows API documentation, an illegal instruction sequence should generate
2150 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2151 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2152 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2153
2154 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2155
2156 // From "Execution Protection in the Windows Operating System" draft 0.35
2157 // Once a system header becomes available, the "real" define should be
2158 // included or copied here.
2159 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2160
2161 // Handle NAT Bit consumption on IA64.
2162 #ifdef _M_IA64
2163 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2164 #endif
2165
2166 // Windows Vista/2008 heap corruption check
2167 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2168
2169 #define def_excpt(val) #val, val
2170
2171 struct siglabel {
2172 char *name;
2173 int number;
2174 };
2175
2176 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2177 // C++ compiler contain this error code. Because this is a compiler-generated
2178 // error, the code is not listed in the Win32 API header files.
2179 // The code is actually a cryptic mnemonic device, with the initial "E"
2180 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2181 // ASCII values of "msc".
2182
2183 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2184
2185
2186 struct siglabel exceptlabels[] = {
2187 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2188 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2189 def_excpt(EXCEPTION_BREAKPOINT),
2190 def_excpt(EXCEPTION_SINGLE_STEP),
2191 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2192 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2193 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2194 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2195 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2196 def_excpt(EXCEPTION_FLT_OVERFLOW),
2197 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2198 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2199 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2200 def_excpt(EXCEPTION_INT_OVERFLOW),
2201 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2202 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2203 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2204 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2205 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2206 def_excpt(EXCEPTION_STACK_OVERFLOW),
2207 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2208 def_excpt(EXCEPTION_GUARD_PAGE),
2209 def_excpt(EXCEPTION_INVALID_HANDLE),
2210 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2211 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2212 #ifdef _M_IA64
2213 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2214 #endif
2215 NULL, 0
2216 };
2217
2218 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2219 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2220 if (exceptlabels[i].number == exception_code) {
2221 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2222 return buf;
2223 }
2224 }
2225
2226 return NULL;
2227 }
2228
2229 //-----------------------------------------------------------------------------
2230 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2231 // handle exception caused by idiv; should only happen for -MinInt/-1
2232 // (division by zero is handled explicitly)
2233 #ifdef _M_IA64
2234 assert(0, "Fix Handle_IDiv_Exception");
2235 #else
2236 #ifdef _M_AMD64
2237 PCONTEXT ctx = exceptionInfo->ContextRecord;
2238 address pc = (address)ctx->Rip;
2239 assert(pc[0] == 0xF7, "not an idiv opcode");
2240 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2241 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2242 // set correct result values and continue after idiv instruction
2243 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2244 ctx->Rax = (DWORD)min_jint; // result
2245 ctx->Rdx = (DWORD)0; // remainder
2246 // Continue the execution
2247 #else
2248 PCONTEXT ctx = exceptionInfo->ContextRecord;
2249 address pc = (address)ctx->Eip;
2250 assert(pc[0] == 0xF7, "not an idiv opcode");
2251 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2252 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2253 // set correct result values and continue after idiv instruction
2254 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2255 ctx->Eax = (DWORD)min_jint; // result
2256 ctx->Edx = (DWORD)0; // remainder
2257 // Continue the execution
2258 #endif
2259 #endif
2260 return EXCEPTION_CONTINUE_EXECUTION;
2261 }
2262
2263 //-----------------------------------------------------------------------------
2264 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2265 PCONTEXT ctx = exceptionInfo->ContextRecord;
2266 #ifndef _WIN64
2267 // handle exception caused by native method modifying control word
2268 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2269
2270 switch (exception_code) {
2271 case EXCEPTION_FLT_DENORMAL_OPERAND:
2272 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2273 case EXCEPTION_FLT_INEXACT_RESULT:
2274 case EXCEPTION_FLT_INVALID_OPERATION:
2275 case EXCEPTION_FLT_OVERFLOW:
2276 case EXCEPTION_FLT_STACK_CHECK:
2277 case EXCEPTION_FLT_UNDERFLOW:
2278 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2279 if (fp_control_word != ctx->FloatSave.ControlWord) {
2280 // Restore FPCW and mask out FLT exceptions
2281 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2282 // Mask out pending FLT exceptions
2283 ctx->FloatSave.StatusWord &= 0xffffff00;
2284 return EXCEPTION_CONTINUE_EXECUTION;
2285 }
2286 }
2287
2288 if (prev_uef_handler != NULL) {
2289 // We didn't handle this exception so pass it to the previous
2290 // UnhandledExceptionFilter.
2291 return (prev_uef_handler)(exceptionInfo);
2292 }
2293 #else // !_WIN64
2294 // On Windows, the mxcsr control bits are non-volatile across calls
2295 // See also CR 6192333
2296 //
2297 jint MxCsr = INITIAL_MXCSR;
2298 // we can't use StubRoutines::addr_mxcsr_std()
2299 // because in Win64 mxcsr is not saved there
2300 if (MxCsr != ctx->MxCsr) {
2301 ctx->MxCsr = MxCsr;
2302 return EXCEPTION_CONTINUE_EXECUTION;
2303 }
2304 #endif // !_WIN64
2305
2306 return EXCEPTION_CONTINUE_SEARCH;
2307 }
2308
2309 static inline void report_error(Thread* t, DWORD exception_code,
2310 address addr, void* siginfo, void* context) {
2311 VMError err(t, exception_code, addr, siginfo, context);
2312 err.report_and_die();
2313
2314 // If UseOsErrorReporting, this will return here and save the error file
2315 // somewhere where we can find it in the minidump.
2316 }
2317
2318 //-----------------------------------------------------------------------------
2319 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2320 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2321 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2322 #ifdef _M_IA64
2323 // On Itanium, we need the "precise pc", which has the slot number coded
2324 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2325 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2326 // Convert the pc to "Unix format", which has the slot number coded
2327 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2328 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2329 // information is saved in the Unix format.
2330 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2331 #else
2332 #ifdef _M_AMD64
2333 address pc = (address) exceptionInfo->ContextRecord->Rip;
2334 #else
2335 address pc = (address) exceptionInfo->ContextRecord->Eip;
2336 #endif
2337 #endif
2338 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2339
2340 // Handle SafeFetch32 and SafeFetchN exceptions.
2341 if (StubRoutines::is_safefetch_fault(pc)) {
2342 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2343 }
2344
2345 #ifndef _WIN64
2346 // Execution protection violation - win32 running on AMD64 only
2347 // Handled first to avoid misdiagnosis as a "normal" access violation;
2348 // This is safe to do because we have a new/unique ExceptionInformation
2349 // code for this condition.
2350 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2351 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2352 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2353 address addr = (address) exceptionRecord->ExceptionInformation[1];
2354
2355 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2356 int page_size = os::vm_page_size();
2357
2358 // Make sure the pc and the faulting address are sane.
2359 //
2360 // If an instruction spans a page boundary, and the page containing
2361 // the beginning of the instruction is executable but the following
2362 // page is not, the pc and the faulting address might be slightly
2363 // different - we still want to unguard the 2nd page in this case.
2364 //
2365 // 15 bytes seems to be a (very) safe value for max instruction size.
2366 bool pc_is_near_addr =
2367 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2368 bool instr_spans_page_boundary =
2369 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2370 (intptr_t) page_size) > 0);
2371
2372 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2373 static volatile address last_addr =
2374 (address) os::non_memory_address_word();
2375
2376 // In conservative mode, don't unguard unless the address is in the VM
2377 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2378 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2379
2380 // Set memory to RWX and retry
2381 address page_start =
2382 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2383 bool res = os::protect_memory((char*) page_start, page_size,
2384 os::MEM_PROT_RWX);
2385
2386 if (PrintMiscellaneous && Verbose) {
2387 char buf[256];
2388 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2389 "at " INTPTR_FORMAT
2390 ", unguarding " INTPTR_FORMAT ": %s", addr,
2391 page_start, (res ? "success" : strerror(errno)));
2392 tty->print_raw_cr(buf);
2393 }
2394
2395 // Set last_addr so if we fault again at the same address, we don't
2396 // end up in an endless loop.
2397 //
2398 // There are two potential complications here. Two threads trapping
2399 // at the same address at the same time could cause one of the
2400 // threads to think it already unguarded, and abort the VM. Likely
2401 // very rare.
2402 //
2403 // The other race involves two threads alternately trapping at
2404 // different addresses and failing to unguard the page, resulting in
2405 // an endless loop. This condition is probably even more unlikely
2406 // than the first.
2407 //
2408 // Although both cases could be avoided by using locks or thread
2409 // local last_addr, these solutions are unnecessary complication:
2410 // this handler is a best-effort safety net, not a complete solution.
2411 // It is disabled by default and should only be used as a workaround
2412 // in case we missed any no-execute-unsafe VM code.
2413
2414 last_addr = addr;
2415
2416 return EXCEPTION_CONTINUE_EXECUTION;
2417 }
2418 }
2419
2420 // Last unguard failed or not unguarding
2421 tty->print_raw_cr("Execution protection violation");
2422 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2423 exceptionInfo->ContextRecord);
2424 return EXCEPTION_CONTINUE_SEARCH;
2425 }
2426 }
2427 #endif // _WIN64
2428
2429 // Check to see if we caught the safepoint code in the
2430 // process of write protecting the memory serialization page.
2431 // It write enables the page immediately after protecting it
2432 // so just return.
2433 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2434 JavaThread* thread = (JavaThread*) t;
2435 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2436 address addr = (address) exceptionRecord->ExceptionInformation[1];
2437 if (os::is_memory_serialize_page(thread, addr)) {
2438 // Block current thread until the memory serialize page permission restored.
2439 os::block_on_serialize_page_trap();
2440 return EXCEPTION_CONTINUE_EXECUTION;
2441 }
2442 }
2443
2444 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2445 VM_Version::is_cpuinfo_segv_addr(pc)) {
2446 // Verify that OS save/restore AVX registers.
2447 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2448 }
2449
2450 if (t != NULL && t->is_Java_thread()) {
2451 JavaThread* thread = (JavaThread*) t;
2452 bool in_java = thread->thread_state() == _thread_in_Java;
2453
2454 // Handle potential stack overflows up front.
2455 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2456 if (os::uses_stack_guard_pages()) {
2457 #ifdef _M_IA64
2458 // Use guard page for register stack.
2459 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2460 address addr = (address) exceptionRecord->ExceptionInformation[1];
2461 // Check for a register stack overflow on Itanium
2462 if (thread->addr_inside_register_stack_red_zone(addr)) {
2463 // Fatal red zone violation happens if the Java program
2464 // catches a StackOverflow error and does so much processing
2465 // that it runs beyond the unprotected yellow guard zone. As
2466 // a result, we are out of here.
2467 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2468 } else if(thread->addr_inside_register_stack(addr)) {
2469 // Disable the yellow zone which sets the state that
2470 // we've got a stack overflow problem.
2471 if (thread->stack_yellow_zone_enabled()) {
2472 thread->disable_stack_yellow_zone();
2473 }
2474 // Give us some room to process the exception.
2475 thread->disable_register_stack_guard();
2476 // Tracing with +Verbose.
2477 if (Verbose) {
2478 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2479 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2480 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2481 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2482 thread->register_stack_base(),
2483 thread->register_stack_base() + thread->stack_size());
2484 }
2485
2486 // Reguard the permanent register stack red zone just to be sure.
2487 // We saw Windows silently disabling this without telling us.
2488 thread->enable_register_stack_red_zone();
2489
2490 return Handle_Exception(exceptionInfo,
2491 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2492 }
2493 #endif
2494 if (thread->stack_yellow_zone_enabled()) {
2495 // Yellow zone violation. The o/s has unprotected the first yellow
2496 // zone page for us. Note: must call disable_stack_yellow_zone to
2497 // update the enabled status, even if the zone contains only one page.
2498 thread->disable_stack_yellow_zone();
2499 // If not in java code, return and hope for the best.
2500 return in_java
2501 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2502 : EXCEPTION_CONTINUE_EXECUTION;
2503 } else {
2504 // Fatal red zone violation.
2505 thread->disable_stack_red_zone();
2506 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2507 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2508 exceptionInfo->ContextRecord);
2509 return EXCEPTION_CONTINUE_SEARCH;
2510 }
2511 } else if (in_java) {
2512 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2513 // a one-time-only guard page, which it has released to us. The next
2514 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2515 return Handle_Exception(exceptionInfo,
2516 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2517 } else {
2518 // Can only return and hope for the best. Further stack growth will
2519 // result in an ACCESS_VIOLATION.
2520 return EXCEPTION_CONTINUE_EXECUTION;
2521 }
2522 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2523 // Either stack overflow or null pointer exception.
2524 if (in_java) {
2525 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2526 address addr = (address) exceptionRecord->ExceptionInformation[1];
2527 address stack_end = thread->stack_base() - thread->stack_size();
2528 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2529 // Stack overflow.
2530 assert(!os::uses_stack_guard_pages(),
2531 "should be caught by red zone code above.");
2532 return Handle_Exception(exceptionInfo,
2533 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2534 }
2535 // Check for safepoint polling and implicit null
2536 // We only expect null pointers in the stubs (vtable)
2537 // the rest are checked explicitly now.
2538 CodeBlob* cb = CodeCache::find_blob(pc);
2539 if (cb != NULL) {
2540 if (os::is_poll_address(addr)) {
2541 address stub = SharedRuntime::get_poll_stub(pc);
2542 return Handle_Exception(exceptionInfo, stub);
2543 }
2544 }
2545 {
2546 #ifdef _WIN64
2547 // If it's a legal stack address map the entire region in
2548 //
2549 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2550 address addr = (address) exceptionRecord->ExceptionInformation[1];
2551 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2552 addr = (address)((uintptr_t)addr &
2553 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2554 os::commit_memory((char *)addr, thread->stack_base() - addr,
2555 !ExecMem);
2556 return EXCEPTION_CONTINUE_EXECUTION;
2557 } else
2558 #endif
2559 {
2560 // Null pointer exception.
2561 #ifdef _M_IA64
2562 // Process implicit null checks in compiled code. Note: Implicit null checks
2563 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2564 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2565 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2566 // Handle implicit null check in UEP method entry
2567 if (cb && (cb->is_frame_complete_at(pc) ||
2568 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2569 if (Verbose) {
2570 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2571 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2572 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2573 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2574 *(bundle_start + 1), *bundle_start);
2575 }
2576 return Handle_Exception(exceptionInfo,
2577 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2578 }
2579 }
2580
2581 // Implicit null checks were processed above. Hence, we should not reach
2582 // here in the usual case => die!
2583 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2584 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 return EXCEPTION_CONTINUE_SEARCH;
2587
2588 #else // !IA64
2589
2590 // Windows 98 reports faulting addresses incorrectly
2591 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2592 !os::win32::is_nt()) {
2593 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2594 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2595 }
2596 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2597 exceptionInfo->ContextRecord);
2598 return EXCEPTION_CONTINUE_SEARCH;
2599 #endif
2600 }
2601 }
2602 }
2603
2604 #ifdef _WIN64
2605 // Special care for fast JNI field accessors.
2606 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2607 // in and the heap gets shrunk before the field access.
2608 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2609 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2610 if (addr != (address)-1) {
2611 return Handle_Exception(exceptionInfo, addr);
2612 }
2613 }
2614 #endif
2615
2616 // Stack overflow or null pointer exception in native code.
2617 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2618 exceptionInfo->ContextRecord);
2619 return EXCEPTION_CONTINUE_SEARCH;
2620 } // /EXCEPTION_ACCESS_VIOLATION
2621 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2622 #if defined _M_IA64
2623 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2624 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2625 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2626
2627 // Compiled method patched to be non entrant? Following conditions must apply:
2628 // 1. must be first instruction in bundle
2629 // 2. must be a break instruction with appropriate code
2630 if ((((uint64_t) pc & 0x0F) == 0) &&
2631 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2632 return Handle_Exception(exceptionInfo,
2633 (address)SharedRuntime::get_handle_wrong_method_stub());
2634 }
2635 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2636 #endif
2637
2638
2639 if (in_java) {
2640 switch (exception_code) {
2641 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2642 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2643
2644 case EXCEPTION_INT_OVERFLOW:
2645 return Handle_IDiv_Exception(exceptionInfo);
2646
2647 } // switch
2648 }
2649 if (((thread->thread_state() == _thread_in_Java) ||
2650 (thread->thread_state() == _thread_in_native)) &&
2651 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2652 LONG result=Handle_FLT_Exception(exceptionInfo);
2653 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2654 }
2655 }
2656
2657 if (exception_code != EXCEPTION_BREAKPOINT) {
2658 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2659 exceptionInfo->ContextRecord);
2660 }
2661 return EXCEPTION_CONTINUE_SEARCH;
2662 }
2663
2664 #ifndef _WIN64
2665 // Special care for fast JNI accessors.
2666 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2667 // the heap gets shrunk before the field access.
2668 // Need to install our own structured exception handler since native code may
2669 // install its own.
2670 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2671 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2672 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2673 address pc = (address) exceptionInfo->ContextRecord->Eip;
2674 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2675 if (addr != (address)-1) {
2676 return Handle_Exception(exceptionInfo, addr);
2677 }
2678 }
2679 return EXCEPTION_CONTINUE_SEARCH;
2680 }
2681
2682 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2683 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2684 jobject obj, \
2685 jfieldID fieldID) { \
2686 __try { \
2687 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2688 obj, \
2689 fieldID); \
2690 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2691 _exception_info())) { \
2692 } \
2693 return 0; \
2694 }
2695
2696 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2697 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2698 DEFINE_FAST_GETFIELD(jchar, char, Char)
2699 DEFINE_FAST_GETFIELD(jshort, short, Short)
2700 DEFINE_FAST_GETFIELD(jint, int, Int)
2701 DEFINE_FAST_GETFIELD(jlong, long, Long)
2702 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2703 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2704
2705 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2706 switch (type) {
2707 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2708 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2709 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2710 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2711 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2712 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2713 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2714 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2715 default: ShouldNotReachHere();
2716 }
2717 return (address)-1;
2718 }
2719 #endif
2720
2721 // Virtual Memory
2722
2723 int os::vm_page_size() { return os::win32::vm_page_size(); }
2724 int os::vm_allocation_granularity() {
2725 return os::win32::vm_allocation_granularity();
2726 }
2727
2728 // Windows large page support is available on Windows 2003. In order to use
2729 // large page memory, the administrator must first assign additional privilege
2730 // to the user:
2731 // + select Control Panel -> Administrative Tools -> Local Security Policy
2732 // + select Local Policies -> User Rights Assignment
2733 // + double click "Lock pages in memory", add users and/or groups
2734 // + reboot
2735 // Note the above steps are needed for administrator as well, as administrators
2736 // by default do not have the privilege to lock pages in memory.
2737 //
2738 // Note about Windows 2003: although the API supports committing large page
2739 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2740 // scenario, I found through experiment it only uses large page if the entire
2741 // memory region is reserved and committed in a single VirtualAlloc() call.
2742 // This makes Windows large page support more or less like Solaris ISM, in
2743 // that the entire heap must be committed upfront. This probably will change
2744 // in the future, if so the code below needs to be revisited.
2745
2746 #ifndef MEM_LARGE_PAGES
2747 #define MEM_LARGE_PAGES 0x20000000
2748 #endif
2749
2750 static HANDLE _hProcess;
2751 static HANDLE _hToken;
2752
2753 // Container for NUMA node list info
2754 class NUMANodeListHolder {
2755 private:
2756 int *_numa_used_node_list; // allocated below
2757 int _numa_used_node_count;
2758
2759 void free_node_list() {
2760 if (_numa_used_node_list != NULL) {
2761 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2762 }
2763 }
2764
2765 public:
2766 NUMANodeListHolder() {
2767 _numa_used_node_count = 0;
2768 _numa_used_node_list = NULL;
2769 // do rest of initialization in build routine (after function pointers are set up)
2770 }
2771
2772 ~NUMANodeListHolder() {
2773 free_node_list();
2774 }
2775
2776 bool build() {
2777 DWORD_PTR proc_aff_mask;
2778 DWORD_PTR sys_aff_mask;
2779 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2780 ULONG highest_node_number;
2781 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2782 free_node_list();
2783 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2784 for (unsigned int i = 0; i <= highest_node_number; i++) {
2785 ULONGLONG proc_mask_numa_node;
2786 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2787 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2788 _numa_used_node_list[_numa_used_node_count++] = i;
2789 }
2790 }
2791 return (_numa_used_node_count > 1);
2792 }
2793
2794 int get_count() { return _numa_used_node_count; }
2795 int get_node_list_entry(int n) {
2796 // for indexes out of range, returns -1
2797 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2798 }
2799
2800 } numa_node_list_holder;
2801
2802
2803
2804 static size_t _large_page_size = 0;
2805
2806 static bool resolve_functions_for_large_page_init() {
2807 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2808 os::Advapi32Dll::AdvapiAvailable();
2809 }
2810
2811 static bool request_lock_memory_privilege() {
2812 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2813 os::current_process_id());
2814
2815 LUID luid;
2816 if (_hProcess != NULL &&
2817 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2818 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2819
2820 TOKEN_PRIVILEGES tp;
2821 tp.PrivilegeCount = 1;
2822 tp.Privileges[0].Luid = luid;
2823 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2824
2825 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2826 // privilege. Check GetLastError() too. See MSDN document.
2827 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2828 (GetLastError() == ERROR_SUCCESS)) {
2829 return true;
2830 }
2831 }
2832
2833 return false;
2834 }
2835
2836 static void cleanup_after_large_page_init() {
2837 if (_hProcess) CloseHandle(_hProcess);
2838 _hProcess = NULL;
2839 if (_hToken) CloseHandle(_hToken);
2840 _hToken = NULL;
2841 }
2842
2843 static bool numa_interleaving_init() {
2844 bool success = false;
2845 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2846
2847 // print a warning if UseNUMAInterleaving flag is specified on command line
2848 bool warn_on_failure = use_numa_interleaving_specified;
2849 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2850
2851 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2852 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2853 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2854
2855 if (os::Kernel32Dll::NumaCallsAvailable()) {
2856 if (numa_node_list_holder.build()) {
2857 if (PrintMiscellaneous && Verbose) {
2858 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2859 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2860 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2861 }
2862 tty->print("\n");
2863 }
2864 success = true;
2865 } else {
2866 WARN("Process does not cover multiple NUMA nodes.");
2867 }
2868 } else {
2869 WARN("NUMA Interleaving is not supported by the operating system.");
2870 }
2871 if (!success) {
2872 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2873 }
2874 return success;
2875 #undef WARN
2876 }
2877
2878 // this routine is used whenever we need to reserve a contiguous VA range
2879 // but we need to make separate VirtualAlloc calls for each piece of the range
2880 // Reasons for doing this:
2881 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2882 // * UseNUMAInterleaving requires a separate node for each piece
2883 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2884 DWORD prot,
2885 bool should_inject_error = false) {
2886 char * p_buf;
2887 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2888 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2889 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2890
2891 // first reserve enough address space in advance since we want to be
2892 // able to break a single contiguous virtual address range into multiple
2893 // large page commits but WS2003 does not allow reserving large page space
2894 // so we just use 4K pages for reserve, this gives us a legal contiguous
2895 // address space. then we will deallocate that reservation, and re alloc
2896 // using large pages
2897 const size_t size_of_reserve = bytes + chunk_size;
2898 if (bytes > size_of_reserve) {
2899 // Overflowed.
2900 return NULL;
2901 }
2902 p_buf = (char *) VirtualAlloc(addr,
2903 size_of_reserve, // size of Reserve
2904 MEM_RESERVE,
2905 PAGE_READWRITE);
2906 // If reservation failed, return NULL
2907 if (p_buf == NULL) return NULL;
2908 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2909 os::release_memory(p_buf, bytes + chunk_size);
2910
2911 // we still need to round up to a page boundary (in case we are using large pages)
2912 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2913 // instead we handle this in the bytes_to_rq computation below
2914 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2915
2916 // now go through and allocate one chunk at a time until all bytes are
2917 // allocated
2918 size_t bytes_remaining = bytes;
2919 // An overflow of align_size_up() would have been caught above
2920 // in the calculation of size_of_reserve.
2921 char * next_alloc_addr = p_buf;
2922 HANDLE hProc = GetCurrentProcess();
2923
2924 #ifdef ASSERT
2925 // Variable for the failure injection
2926 long ran_num = os::random();
2927 size_t fail_after = ran_num % bytes;
2928 #endif
2929
2930 int count=0;
2931 while (bytes_remaining) {
2932 // select bytes_to_rq to get to the next chunk_size boundary
2933
2934 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2935 // Note allocate and commit
2936 char * p_new;
2937
2938 #ifdef ASSERT
2939 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2940 #else
2941 const bool inject_error_now = false;
2942 #endif
2943
2944 if (inject_error_now) {
2945 p_new = NULL;
2946 } else {
2947 if (!UseNUMAInterleaving) {
2948 p_new = (char *) VirtualAlloc(next_alloc_addr,
2949 bytes_to_rq,
2950 flags,
2951 prot);
2952 } else {
2953 // get the next node to use from the used_node_list
2954 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2955 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2956 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2957 next_alloc_addr,
2958 bytes_to_rq,
2959 flags,
2960 prot,
2961 node);
2962 }
2963 }
2964
2965 if (p_new == NULL) {
2966 // Free any allocated pages
2967 if (next_alloc_addr > p_buf) {
2968 // Some memory was committed so release it.
2969 size_t bytes_to_release = bytes - bytes_remaining;
2970 // NMT has yet to record any individual blocks, so it
2971 // need to create a dummy 'reserve' record to match
2972 // the release.
2973 MemTracker::record_virtual_memory_reserve((address)p_buf,
2974 bytes_to_release, CALLER_PC);
2975 os::release_memory(p_buf, bytes_to_release);
2976 }
2977 #ifdef ASSERT
2978 if (should_inject_error) {
2979 if (TracePageSizes && Verbose) {
2980 tty->print_cr("Reserving pages individually failed.");
2981 }
2982 }
2983 #endif
2984 return NULL;
2985 }
2986
2987 bytes_remaining -= bytes_to_rq;
2988 next_alloc_addr += bytes_to_rq;
2989 count++;
2990 }
2991 // Although the memory is allocated individually, it is returned as one.
2992 // NMT records it as one block.
2993 if ((flags & MEM_COMMIT) != 0) {
2994 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2995 } else {
2996 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2997 }
2998
2999 // made it this far, success
3000 return p_buf;
3001 }
3002
3003
3004
3005 void os::large_page_init() {
3006 if (!UseLargePages) return;
3007
3008 // print a warning if any large page related flag is specified on command line
3009 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3010 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3011 bool success = false;
3012
3013 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3014 if (resolve_functions_for_large_page_init()) {
3015 if (request_lock_memory_privilege()) {
3016 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3017 if (s) {
3018 #if defined(IA32) || defined(AMD64)
3019 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3020 WARN("JVM cannot use large pages bigger than 4mb.");
3021 } else {
3022 #endif
3023 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3024 _large_page_size = LargePageSizeInBytes;
3025 } else {
3026 _large_page_size = s;
3027 }
3028 success = true;
3029 #if defined(IA32) || defined(AMD64)
3030 }
3031 #endif
3032 } else {
3033 WARN("Large page is not supported by the processor.");
3034 }
3035 } else {
3036 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3037 }
3038 } else {
3039 WARN("Large page is not supported by the operating system.");
3040 }
3041 #undef WARN
3042
3043 const size_t default_page_size = (size_t) vm_page_size();
3044 if (success && _large_page_size > default_page_size) {
3045 _page_sizes[0] = _large_page_size;
3046 _page_sizes[1] = default_page_size;
3047 _page_sizes[2] = 0;
3048 }
3049
3050 cleanup_after_large_page_init();
3051 UseLargePages = success;
3052 }
3053
3054 // On win32, one cannot release just a part of reserved memory, it's an
3055 // all or nothing deal. When we split a reservation, we must break the
3056 // reservation into two reservations.
3057 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3058 bool realloc) {
3059 if (size > 0) {
3060 release_memory(base, size);
3061 if (realloc) {
3062 reserve_memory(split, base);
3063 }
3064 if (size != split) {
3065 reserve_memory(size - split, base + split);
3066 }
3067 }
3068 }
3069
3070 // Multiple threads can race in this code but it's not possible to unmap small sections of
3071 // virtual space to get requested alignment, like posix-like os's.
3072 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3073 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3074 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3075 "Alignment must be a multiple of allocation granularity (page size)");
3076 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3077
3078 size_t extra_size = size + alignment;
3079 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3080
3081 char* aligned_base = NULL;
3082
3083 do {
3084 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3085 if (extra_base == NULL) {
3086 return NULL;
3087 }
3088 // Do manual alignment
3089 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3090
3091 os::release_memory(extra_base, extra_size);
3092
3093 aligned_base = os::reserve_memory(size, aligned_base);
3094
3095 } while (aligned_base == NULL);
3096
3097 return aligned_base;
3098 }
3099
3100 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3101 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3102 "reserve alignment");
3103 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3104 char* res;
3105 // note that if UseLargePages is on, all the areas that require interleaving
3106 // will go thru reserve_memory_special rather than thru here.
3107 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3108 if (!use_individual) {
3109 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3110 } else {
3111 elapsedTimer reserveTimer;
3112 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3113 // in numa interleaving, we have to allocate pages individually
3114 // (well really chunks of NUMAInterleaveGranularity size)
3115 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3116 if (res == NULL) {
3117 warning("NUMA page allocation failed");
3118 }
3119 if (Verbose && PrintMiscellaneous) {
3120 reserveTimer.stop();
3121 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3122 reserveTimer.milliseconds(), reserveTimer.ticks());
3123 }
3124 }
3125 assert(res == NULL || addr == NULL || addr == res,
3126 "Unexpected address from reserve.");
3127
3128 return res;
3129 }
3130
3131 // Reserve memory at an arbitrary address, only if that area is
3132 // available (and not reserved for something else).
3133 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3134 // Windows os::reserve_memory() fails of the requested address range is
3135 // not avilable.
3136 return reserve_memory(bytes, requested_addr);
3137 }
3138
3139 size_t os::large_page_size() {
3140 return _large_page_size;
3141 }
3142
3143 bool os::can_commit_large_page_memory() {
3144 // Windows only uses large page memory when the entire region is reserved
3145 // and committed in a single VirtualAlloc() call. This may change in the
3146 // future, but with Windows 2003 it's not possible to commit on demand.
3147 return false;
3148 }
3149
3150 bool os::can_execute_large_page_memory() {
3151 return true;
3152 }
3153
3154 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3155 bool exec) {
3156 assert(UseLargePages, "only for large pages");
3157
3158 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3159 return NULL; // Fallback to small pages.
3160 }
3161
3162 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3163 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3164
3165 // with large pages, there are two cases where we need to use Individual Allocation
3166 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3167 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3168 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3169 if (TracePageSizes && Verbose) {
3170 tty->print_cr("Reserving large pages individually.");
3171 }
3172 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3173 if (p_buf == NULL) {
3174 // give an appropriate warning message
3175 if (UseNUMAInterleaving) {
3176 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3177 }
3178 if (UseLargePagesIndividualAllocation) {
3179 warning("Individually allocated large pages failed, "
3180 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3181 }
3182 return NULL;
3183 }
3184
3185 return p_buf;
3186
3187 } else {
3188 if (TracePageSizes && Verbose) {
3189 tty->print_cr("Reserving large pages in a single large chunk.");
3190 }
3191 // normal policy just allocate it all at once
3192 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3193 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3194 if (res != NULL) {
3195 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3196 }
3197
3198 return res;
3199 }
3200 }
3201
3202 bool os::release_memory_special(char* base, size_t bytes) {
3203 assert(base != NULL, "Sanity check");
3204 return release_memory(base, bytes);
3205 }
3206
3207 void os::print_statistics() {
3208 }
3209
3210 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3211 int err = os::get_last_error();
3212 char buf[256];
3213 size_t buf_len = os::lasterror(buf, sizeof(buf));
3214 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3215 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3216 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3217 }
3218
3219 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3220 if (bytes == 0) {
3221 // Don't bother the OS with noops.
3222 return true;
3223 }
3224 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3225 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3226 // Don't attempt to print anything if the OS call fails. We're
3227 // probably low on resources, so the print itself may cause crashes.
3228
3229 // unless we have NUMAInterleaving enabled, the range of a commit
3230 // is always within a reserve covered by a single VirtualAlloc
3231 // in that case we can just do a single commit for the requested size
3232 if (!UseNUMAInterleaving) {
3233 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3234 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3235 return false;
3236 }
3237 if (exec) {
3238 DWORD oldprot;
3239 // Windows doc says to use VirtualProtect to get execute permissions
3240 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3241 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3242 return false;
3243 }
3244 }
3245 return true;
3246 } else {
3247
3248 // when NUMAInterleaving is enabled, the commit might cover a range that
3249 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3250 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3251 // returns represents the number of bytes that can be committed in one step.
3252 size_t bytes_remaining = bytes;
3253 char * next_alloc_addr = addr;
3254 while (bytes_remaining > 0) {
3255 MEMORY_BASIC_INFORMATION alloc_info;
3256 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3257 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3258 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3259 PAGE_READWRITE) == NULL) {
3260 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3261 exec);)
3262 return false;
3263 }
3264 if (exec) {
3265 DWORD oldprot;
3266 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3267 PAGE_EXECUTE_READWRITE, &oldprot)) {
3268 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3269 exec);)
3270 return false;
3271 }
3272 }
3273 bytes_remaining -= bytes_to_rq;
3274 next_alloc_addr += bytes_to_rq;
3275 }
3276 }
3277 // if we made it this far, return true
3278 return true;
3279 }
3280
3281 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3282 bool exec) {
3283 // alignment_hint is ignored on this OS
3284 return pd_commit_memory(addr, size, exec);
3285 }
3286
3287 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3288 const char* mesg) {
3289 assert(mesg != NULL, "mesg must be specified");
3290 if (!pd_commit_memory(addr, size, exec)) {
3291 warn_fail_commit_memory(addr, size, exec);
3292 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3293 }
3294 }
3295
3296 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3297 size_t alignment_hint, bool exec,
3298 const char* mesg) {
3299 // alignment_hint is ignored on this OS
3300 pd_commit_memory_or_exit(addr, size, exec, mesg);
3301 }
3302
3303 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3304 if (bytes == 0) {
3305 // Don't bother the OS with noops.
3306 return true;
3307 }
3308 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3309 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3310 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3311 }
3312
3313 bool os::pd_release_memory(char* addr, size_t bytes) {
3314 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3315 }
3316
3317 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3318 return os::commit_memory(addr, size, !ExecMem);
3319 }
3320
3321 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3322 return os::uncommit_memory(addr, size);
3323 }
3324
3325 // Set protections specified
3326 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3327 bool is_committed) {
3328 unsigned int p = 0;
3329 switch (prot) {
3330 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3331 case MEM_PROT_READ: p = PAGE_READONLY; break;
3332 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3333 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3334 default:
3335 ShouldNotReachHere();
3336 }
3337
3338 DWORD old_status;
3339
3340 // Strange enough, but on Win32 one can change protection only for committed
3341 // memory, not a big deal anyway, as bytes less or equal than 64K
3342 if (!is_committed) {
3343 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3344 "cannot commit protection page");
3345 }
3346 // One cannot use os::guard_memory() here, as on Win32 guard page
3347 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3348 //
3349 // Pages in the region become guard pages. Any attempt to access a guard page
3350 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3351 // the guard page status. Guard pages thus act as a one-time access alarm.
3352 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3353 }
3354
3355 bool os::guard_memory(char* addr, size_t bytes) {
3356 DWORD old_status;
3357 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3358 }
3359
3360 bool os::unguard_memory(char* addr, size_t bytes) {
3361 DWORD old_status;
3362 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3363 }
3364
3365 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3366 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3367 void os::numa_make_global(char *addr, size_t bytes) { }
3368 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3369 bool os::numa_topology_changed() { return false; }
3370 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3371 int os::numa_get_group_id() { return 0; }
3372 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3373 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3374 // Provide an answer for UMA systems
3375 ids[0] = 0;
3376 return 1;
3377 } else {
3378 // check for size bigger than actual groups_num
3379 size = MIN2(size, numa_get_groups_num());
3380 for (int i = 0; i < (int)size; i++) {
3381 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3382 }
3383 return size;
3384 }
3385 }
3386
3387 bool os::get_page_info(char *start, page_info* info) {
3388 return false;
3389 }
3390
3391 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3392 page_info* page_found) {
3393 return end;
3394 }
3395
3396 char* os::non_memory_address_word() {
3397 // Must never look like an address returned by reserve_memory,
3398 // even in its subfields (as defined by the CPU immediate fields,
3399 // if the CPU splits constants across multiple instructions).
3400 return (char*)-1;
3401 }
3402
3403 #define MAX_ERROR_COUNT 100
3404 #define SYS_THREAD_ERROR 0xffffffffUL
3405
3406 void os::pd_start_thread(Thread* thread) {
3407 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3408 // Returns previous suspend state:
3409 // 0: Thread was not suspended
3410 // 1: Thread is running now
3411 // >1: Thread is still suspended.
3412 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3413 }
3414
3415 class HighResolutionInterval : public CHeapObj<mtThread> {
3416 // The default timer resolution seems to be 10 milliseconds.
3417 // (Where is this written down?)
3418 // If someone wants to sleep for only a fraction of the default,
3419 // then we set the timer resolution down to 1 millisecond for
3420 // the duration of their interval.
3421 // We carefully set the resolution back, since otherwise we
3422 // seem to incur an overhead (3%?) that we don't need.
3423 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3424 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3425 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3426 // timeBeginPeriod() if the relative error exceeded some threshold.
3427 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3428 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3429 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3430 // resolution timers running.
3431 private:
3432 jlong resolution;
3433 public:
3434 HighResolutionInterval(jlong ms) {
3435 resolution = ms % 10L;
3436 if (resolution != 0) {
3437 MMRESULT result = timeBeginPeriod(1L);
3438 }
3439 }
3440 ~HighResolutionInterval() {
3441 if (resolution != 0) {
3442 MMRESULT result = timeEndPeriod(1L);
3443 }
3444 resolution = 0L;
3445 }
3446 };
3447
3448 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3449 jlong limit = (jlong) MAXDWORD;
3450
3451 while (ms > limit) {
3452 int res;
3453 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3454 return res;
3455 }
3456 ms -= limit;
3457 }
3458
3459 assert(thread == Thread::current(), "thread consistency check");
3460 OSThread* osthread = thread->osthread();
3461 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3462 int result;
3463 if (interruptable) {
3464 assert(thread->is_Java_thread(), "must be java thread");
3465 JavaThread *jt = (JavaThread *) thread;
3466 ThreadBlockInVM tbivm(jt);
3467
3468 jt->set_suspend_equivalent();
3469 // cleared by handle_special_suspend_equivalent_condition() or
3470 // java_suspend_self() via check_and_wait_while_suspended()
3471
3472 HANDLE events[1];
3473 events[0] = osthread->interrupt_event();
3474 HighResolutionInterval *phri=NULL;
3475 if (!ForceTimeHighResolution) {
3476 phri = new HighResolutionInterval(ms);
3477 }
3478 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3479 result = OS_TIMEOUT;
3480 } else {
3481 ResetEvent(osthread->interrupt_event());
3482 osthread->set_interrupted(false);
3483 result = OS_INTRPT;
3484 }
3485 delete phri; //if it is NULL, harmless
3486
3487 // were we externally suspended while we were waiting?
3488 jt->check_and_wait_while_suspended();
3489 } else {
3490 assert(!thread->is_Java_thread(), "must not be java thread");
3491 Sleep((long) ms);
3492 result = OS_TIMEOUT;
3493 }
3494 return result;
3495 }
3496
3497 // Short sleep, direct OS call.
3498 //
3499 // ms = 0, means allow others (if any) to run.
3500 //
3501 void os::naked_short_sleep(jlong ms) {
3502 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3503 Sleep(ms);
3504 }
3505
3506 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3507 void os::infinite_sleep() {
3508 while (true) { // sleep forever ...
3509 Sleep(100000); // ... 100 seconds at a time
3510 }
3511 }
3512
3513 typedef BOOL (WINAPI * STTSignature)(void);
3514
3515 void os::naked_yield() {
3516 // Use either SwitchToThread() or Sleep(0)
3517 // Consider passing back the return value from SwitchToThread().
3518 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3519 SwitchToThread();
3520 } else {
3521 Sleep(0);
3522 }
3523 }
3524
3525 // Win32 only gives you access to seven real priorities at a time,
3526 // so we compress Java's ten down to seven. It would be better
3527 // if we dynamically adjusted relative priorities.
3528
3529 int os::java_to_os_priority[CriticalPriority + 1] = {
3530 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3531 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3532 THREAD_PRIORITY_LOWEST, // 2
3533 THREAD_PRIORITY_BELOW_NORMAL, // 3
3534 THREAD_PRIORITY_BELOW_NORMAL, // 4
3535 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3536 THREAD_PRIORITY_NORMAL, // 6
3537 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3539 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3540 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3541 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3542 };
3543
3544 int prio_policy1[CriticalPriority + 1] = {
3545 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3546 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3547 THREAD_PRIORITY_LOWEST, // 2
3548 THREAD_PRIORITY_BELOW_NORMAL, // 3
3549 THREAD_PRIORITY_BELOW_NORMAL, // 4
3550 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3551 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3552 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3553 THREAD_PRIORITY_HIGHEST, // 8
3554 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3555 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3556 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3557 };
3558
3559 static int prio_init() {
3560 // If ThreadPriorityPolicy is 1, switch tables
3561 if (ThreadPriorityPolicy == 1) {
3562 int i;
3563 for (i = 0; i < CriticalPriority + 1; i++) {
3564 os::java_to_os_priority[i] = prio_policy1[i];
3565 }
3566 }
3567 if (UseCriticalJavaThreadPriority) {
3568 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3569 }
3570 return 0;
3571 }
3572
3573 OSReturn os::set_native_priority(Thread* thread, int priority) {
3574 if (!UseThreadPriorities) return OS_OK;
3575 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3576 return ret ? OS_OK : OS_ERR;
3577 }
3578
3579 OSReturn os::get_native_priority(const Thread* const thread,
3580 int* priority_ptr) {
3581 if (!UseThreadPriorities) {
3582 *priority_ptr = java_to_os_priority[NormPriority];
3583 return OS_OK;
3584 }
3585 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3586 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3587 assert(false, "GetThreadPriority failed");
3588 return OS_ERR;
3589 }
3590 *priority_ptr = os_prio;
3591 return OS_OK;
3592 }
3593
3594
3595 // Hint to the underlying OS that a task switch would not be good.
3596 // Void return because it's a hint and can fail.
3597 void os::hint_no_preempt() {}
3598
3599 void os::interrupt(Thread* thread) {
3600 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3601 Threads_lock->owned_by_self(),
3602 "possibility of dangling Thread pointer");
3603
3604 OSThread* osthread = thread->osthread();
3605 osthread->set_interrupted(true);
3606 // More than one thread can get here with the same value of osthread,
3607 // resulting in multiple notifications. We do, however, want the store
3608 // to interrupted() to be visible to other threads before we post
3609 // the interrupt event.
3610 OrderAccess::release();
3611 SetEvent(osthread->interrupt_event());
3612 // For JSR166: unpark after setting status
3613 if (thread->is_Java_thread()) {
3614 ((JavaThread*)thread)->parker()->unpark();
3615 }
3616
3617 ParkEvent * ev = thread->_ParkEvent;
3618 if (ev != NULL) ev->unpark();
3619 }
3620
3621
3622 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3623 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3624 "possibility of dangling Thread pointer");
3625
3626 OSThread* osthread = thread->osthread();
3627 // There is no synchronization between the setting of the interrupt
3628 // and it being cleared here. It is critical - see 6535709 - that
3629 // we only clear the interrupt state, and reset the interrupt event,
3630 // if we are going to report that we were indeed interrupted - else
3631 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3632 // depending on the timing. By checking thread interrupt event to see
3633 // if the thread gets real interrupt thus prevent spurious wakeup.
3634 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3635 if (interrupted && clear_interrupted) {
3636 osthread->set_interrupted(false);
3637 ResetEvent(osthread->interrupt_event());
3638 } // Otherwise leave the interrupted state alone
3639
3640 return interrupted;
3641 }
3642
3643 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3644 ExtendedPC os::get_thread_pc(Thread* thread) {
3645 CONTEXT context;
3646 context.ContextFlags = CONTEXT_CONTROL;
3647 HANDLE handle = thread->osthread()->thread_handle();
3648 #ifdef _M_IA64
3649 assert(0, "Fix get_thread_pc");
3650 return ExtendedPC(NULL);
3651 #else
3652 if (GetThreadContext(handle, &context)) {
3653 #ifdef _M_AMD64
3654 return ExtendedPC((address) context.Rip);
3655 #else
3656 return ExtendedPC((address) context.Eip);
3657 #endif
3658 } else {
3659 return ExtendedPC(NULL);
3660 }
3661 #endif
3662 }
3663
3664 // GetCurrentThreadId() returns DWORD
3665 intx os::current_thread_id() { return GetCurrentThreadId(); }
3666
3667 static int _initial_pid = 0;
3668
3669 int os::current_process_id() {
3670 return (_initial_pid ? _initial_pid : _getpid());
3671 }
3672
3673 int os::win32::_vm_page_size = 0;
3674 int os::win32::_vm_allocation_granularity = 0;
3675 int os::win32::_processor_type = 0;
3676 // Processor level is not available on non-NT systems, use vm_version instead
3677 int os::win32::_processor_level = 0;
3678 julong os::win32::_physical_memory = 0;
3679 size_t os::win32::_default_stack_size = 0;
3680
3681 intx os::win32::_os_thread_limit = 0;
3682 volatile intx os::win32::_os_thread_count = 0;
3683
3684 bool os::win32::_is_nt = false;
3685 bool os::win32::_is_windows_2003 = false;
3686 bool os::win32::_is_windows_server = false;
3687
3688 // 6573254
3689 // Currently, the bug is observed across all the supported Windows releases,
3690 // including the latest one (as of this writing - Windows Server 2012 R2)
3691 bool os::win32::_has_exit_bug = true;
3692 bool os::win32::_has_performance_count = 0;
3693
3694 void os::win32::initialize_system_info() {
3695 SYSTEM_INFO si;
3696 GetSystemInfo(&si);
3697 _vm_page_size = si.dwPageSize;
3698 _vm_allocation_granularity = si.dwAllocationGranularity;
3699 _processor_type = si.dwProcessorType;
3700 _processor_level = si.wProcessorLevel;
3701 set_processor_count(si.dwNumberOfProcessors);
3702
3703 MEMORYSTATUSEX ms;
3704 ms.dwLength = sizeof(ms);
3705
3706 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3707 // dwMemoryLoad (% of memory in use)
3708 GlobalMemoryStatusEx(&ms);
3709 _physical_memory = ms.ullTotalPhys;
3710
3711 OSVERSIONINFOEX oi;
3712 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3713 GetVersionEx((OSVERSIONINFO*)&oi);
3714 switch (oi.dwPlatformId) {
3715 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3716 case VER_PLATFORM_WIN32_NT:
3717 _is_nt = true;
3718 {
3719 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3720 if (os_vers == 5002) {
3721 _is_windows_2003 = true;
3722 }
3723 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3724 oi.wProductType == VER_NT_SERVER) {
3725 _is_windows_server = true;
3726 }
3727 }
3728 break;
3729 default: fatal("Unknown platform");
3730 }
3731
3732 _default_stack_size = os::current_stack_size();
3733 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3734 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3735 "stack size not a multiple of page size");
3736
3737 initialize_performance_counter();
3738
3739 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3740 // known to deadlock the system, if the VM issues to thread operations with
3741 // a too high frequency, e.g., such as changing the priorities.
3742 // The 6000 seems to work well - no deadlocks has been notices on the test
3743 // programs that we have seen experience this problem.
3744 if (!os::win32::is_nt()) {
3745 StarvationMonitorInterval = 6000;
3746 }
3747 }
3748
3749
3750 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3751 int ebuflen) {
3752 char path[MAX_PATH];
3753 DWORD size;
3754 DWORD pathLen = (DWORD)sizeof(path);
3755 HINSTANCE result = NULL;
3756
3757 // only allow library name without path component
3758 assert(strchr(name, '\\') == NULL, "path not allowed");
3759 assert(strchr(name, ':') == NULL, "path not allowed");
3760 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3761 jio_snprintf(ebuf, ebuflen,
3762 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3763 return NULL;
3764 }
3765
3766 // search system directory
3767 if ((size = GetSystemDirectory(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 // try Windows directory
3780 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3781 if (size >= pathLen) {
3782 return NULL; // truncated
3783 }
3784 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3785 return NULL; // truncated
3786 }
3787 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3788 return result;
3789 }
3790 }
3791
3792 jio_snprintf(ebuf, ebuflen,
3793 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3794 return NULL;
3795 }
3796
3797 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3798
3799 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3800 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3801 return TRUE;
3802 }
3803
3804 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3805 // Basic approach:
3806 // - Each exiting thread registers its intent to exit and then does so.
3807 // - A thread trying to terminate the process must wait for all
3808 // threads currently exiting to complete their exit.
3809
3810 if (os::win32::has_exit_bug()) {
3811 // The array holds handles of the threads that have started exiting by calling
3812 // _endthreadex().
3813 // Should be large enough to avoid blocking the exiting thread due to lack of
3814 // a free slot.
3815 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3816 static int handle_count = 0;
3817
3818 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3819 static CRITICAL_SECTION crit_sect;
3820 static volatile jint process_exiting = 0;
3821 int i, j;
3822 DWORD res;
3823 HANDLE hproc, hthr;
3824
3825 // The first thread that reached this point, initializes the critical section.
3826 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3827 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3828 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3829 EnterCriticalSection(&crit_sect);
3830
3831 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3832 // Remove from the array those handles of the threads that have completed exiting.
3833 for (i = 0, j = 0; i < handle_count; ++i) {
3834 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3835 if (res == WAIT_TIMEOUT) {
3836 handles[j++] = handles[i];
3837 } else {
3838 if (res == WAIT_FAILED) {
3839 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3840 GetLastError(), __FILE__, __LINE__);
3841 }
3842 // Don't keep the handle, if we failed waiting for it.
3843 CloseHandle(handles[i]);
3844 }
3845 }
3846
3847 // If there's no free slot in the array of the kept handles, we'll have to
3848 // wait until at least one thread completes exiting.
3849 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3850 // Raise the priority of the oldest exiting thread to increase its chances
3851 // to complete sooner.
3852 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3853 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3854 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3855 i = (res - WAIT_OBJECT_0);
3856 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3857 for (; i < handle_count; ++i) {
3858 handles[i] = handles[i + 1];
3859 }
3860 } else {
3861 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3862 (res == WAIT_FAILED ? "failed" : "timed out"),
3863 GetLastError(), __FILE__, __LINE__);
3864 // Don't keep handles, if we failed waiting for them.
3865 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3866 CloseHandle(handles[i]);
3867 }
3868 handle_count = 0;
3869 }
3870 }
3871
3872 // Store a duplicate of the current thread handle in the array of handles.
3873 hproc = GetCurrentProcess();
3874 hthr = GetCurrentThread();
3875 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3876 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3877 warning("DuplicateHandle failed (%u) in %s: %d\n",
3878 GetLastError(), __FILE__, __LINE__);
3879 } else {
3880 ++handle_count;
3881 }
3882
3883 // The current exiting thread has stored its handle in the array, and now
3884 // should leave the critical section before calling _endthreadex().
3885
3886 } else if (what != EPT_THREAD) {
3887 if (handle_count > 0) {
3888 // Before ending the process, make sure all the threads that had called
3889 // _endthreadex() completed.
3890
3891 // Set the priority level of the current thread to the same value as
3892 // the priority level of exiting threads.
3893 // This is to ensure it will be given a fair chance to execute if
3894 // the timeout expires.
3895 hthr = GetCurrentThread();
3896 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3897 for (i = 0; i < handle_count; ++i) {
3898 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3899 }
3900 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3901 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3902 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3903 (res == WAIT_FAILED ? "failed" : "timed out"),
3904 GetLastError(), __FILE__, __LINE__);
3905 }
3906 for (i = 0; i < handle_count; ++i) {
3907 CloseHandle(handles[i]);
3908 }
3909 handle_count = 0;
3910 }
3911
3912 OrderAccess::release_store(&process_exiting, 1);
3913 }
3914
3915 LeaveCriticalSection(&crit_sect);
3916 }
3917
3918 if (what == EPT_THREAD) {
3919 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3920 // Some other thread is about to call exit(), so we
3921 // don't let the current thread proceed to _endthreadex()
3922 SuspendThread(GetCurrentThread());
3923 // Avoid busy-wait loop, if SuspendThread() failed.
3924 Sleep(EXIT_TIMEOUT);
3925 }
3926 }
3927 }
3928
3929 // We are here if either
3930 // - there's no 'race at exit' bug on this OS release;
3931 // - initialization of the critical section failed (unlikely);
3932 // - the current thread has stored its handle and left the critical section;
3933 // - the process-exiting thread has raised the flag and left the critical section.
3934 if (what == EPT_THREAD) {
3935 _endthreadex((unsigned)exit_code);
3936 } else if (what == EPT_PROCESS) {
3937 ::exit(exit_code);
3938 } else {
3939 _exit(exit_code);
3940 }
3941
3942 // Should not reach here
3943 return exit_code;
3944 }
3945
3946 #undef EXIT_TIMEOUT
3947
3948 void os::win32::setmode_streams() {
3949 _setmode(_fileno(stdin), _O_BINARY);
3950 _setmode(_fileno(stdout), _O_BINARY);
3951 _setmode(_fileno(stderr), _O_BINARY);
3952 }
3953
3954
3955 bool os::is_debugger_attached() {
3956 return IsDebuggerPresent() ? true : false;
3957 }
3958
3959
3960 void os::wait_for_keypress_at_exit(void) {
3961 if (PauseAtExit) {
3962 fprintf(stderr, "Press any key to continue...\n");
3963 fgetc(stdin);
3964 }
3965 }
3966
3967
3968 int os::message_box(const char* title, const char* message) {
3969 int result = MessageBox(NULL, message, title,
3970 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3971 return result == IDYES;
3972 }
3973
3974 int os::allocate_thread_local_storage() {
3975 return TlsAlloc();
3976 }
3977
3978
3979 void os::free_thread_local_storage(int index) {
3980 TlsFree(index);
3981 }
3982
3983
3984 void os::thread_local_storage_at_put(int index, void* value) {
3985 TlsSetValue(index, value);
3986 assert(thread_local_storage_at(index) == value, "Just checking");
3987 }
3988
3989
3990 void* os::thread_local_storage_at(int index) {
3991 return TlsGetValue(index);
3992 }
3993
3994
3995 #ifndef PRODUCT
3996 #ifndef _WIN64
3997 // Helpers to check whether NX protection is enabled
3998 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3999 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4000 pex->ExceptionRecord->NumberParameters > 0 &&
4001 pex->ExceptionRecord->ExceptionInformation[0] ==
4002 EXCEPTION_INFO_EXEC_VIOLATION) {
4003 return EXCEPTION_EXECUTE_HANDLER;
4004 }
4005 return EXCEPTION_CONTINUE_SEARCH;
4006 }
4007
4008 void nx_check_protection() {
4009 // If NX is enabled we'll get an exception calling into code on the stack
4010 char code[] = { (char)0xC3 }; // ret
4011 void *code_ptr = (void *)code;
4012 __try {
4013 __asm call code_ptr
4014 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4015 tty->print_raw_cr("NX protection detected.");
4016 }
4017 }
4018 #endif // _WIN64
4019 #endif // PRODUCT
4020
4021 // this is called _before_ the global arguments have been parsed
4022 void os::init(void) {
4023 _initial_pid = _getpid();
4024
4025 init_random(1234567);
4026
4027 win32::initialize_system_info();
4028 win32::setmode_streams();
4029 init_page_sizes((size_t) win32::vm_page_size());
4030
4031 // This may be overridden later when argument processing is done.
4032 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4033 os::win32::is_windows_2003());
4034
4035 // Initialize main_process and main_thread
4036 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4037 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4038 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4039 fatal("DuplicateHandle failed\n");
4040 }
4041 main_thread_id = (int) GetCurrentThreadId();
4042 }
4043
4044 // To install functions for atexit processing
4045 extern "C" {
4046 static void perfMemory_exit_helper() {
4047 perfMemory_exit();
4048 }
4049 }
4050
4051 static jint initSock();
4052
4053 // this is called _after_ the global arguments have been parsed
4054 jint os::init_2(void) {
4055 // Allocate a single page and mark it as readable for safepoint polling
4056 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4057 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4058
4059 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4060 guarantee(return_page != NULL, "Commit Failed for polling page");
4061
4062 os::set_polling_page(polling_page);
4063
4064 #ifndef PRODUCT
4065 if (Verbose && PrintMiscellaneous) {
4066 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4067 (intptr_t)polling_page);
4068 }
4069 #endif
4070
4071 if (!UseMembar) {
4072 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4073 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4074
4075 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4076 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4077
4078 os::set_memory_serialize_page(mem_serialize_page);
4079
4080 #ifndef PRODUCT
4081 if (Verbose && PrintMiscellaneous) {
4082 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4083 (intptr_t)mem_serialize_page);
4084 }
4085 #endif
4086 }
4087
4088 // Setup Windows Exceptions
4089
4090 // for debugging float code generation bugs
4091 if (ForceFloatExceptions) {
4092 #ifndef _WIN64
4093 static long fp_control_word = 0;
4094 __asm { fstcw fp_control_word }
4095 // see Intel PPro Manual, Vol. 2, p 7-16
4096 const long precision = 0x20;
4097 const long underflow = 0x10;
4098 const long overflow = 0x08;
4099 const long zero_div = 0x04;
4100 const long denorm = 0x02;
4101 const long invalid = 0x01;
4102 fp_control_word |= invalid;
4103 __asm { fldcw fp_control_word }
4104 #endif
4105 }
4106
4107 // If stack_commit_size is 0, windows will reserve the default size,
4108 // but only commit a small portion of it.
4109 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4110 size_t default_reserve_size = os::win32::default_stack_size();
4111 size_t actual_reserve_size = stack_commit_size;
4112 if (stack_commit_size < default_reserve_size) {
4113 // If stack_commit_size == 0, we want this too
4114 actual_reserve_size = default_reserve_size;
4115 }
4116
4117 // Check minimum allowable stack size for thread creation and to initialize
4118 // the java system classes, including StackOverflowError - depends on page
4119 // size. Add a page for compiler2 recursion in main thread.
4120 // Add in 2*BytesPerWord times page size to account for VM stack during
4121 // class initialization depending on 32 or 64 bit VM.
4122 size_t min_stack_allowed =
4123 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4124 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4125 if (actual_reserve_size < min_stack_allowed) {
4126 tty->print_cr("\nThe stack size specified is too small, "
4127 "Specify at least %dk",
4128 min_stack_allowed / K);
4129 return JNI_ERR;
4130 }
4131
4132 JavaThread::set_stack_size_at_create(stack_commit_size);
4133
4134 // Calculate theoretical max. size of Threads to guard gainst artifical
4135 // out-of-memory situations, where all available address-space has been
4136 // reserved by thread stacks.
4137 assert(actual_reserve_size != 0, "Must have a stack");
4138
4139 // Calculate the thread limit when we should start doing Virtual Memory
4140 // banging. Currently when the threads will have used all but 200Mb of space.
4141 //
4142 // TODO: consider performing a similar calculation for commit size instead
4143 // as reserve size, since on a 64-bit platform we'll run into that more
4144 // often than running out of virtual memory space. We can use the
4145 // lower value of the two calculations as the os_thread_limit.
4146 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4147 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4148
4149 // at exit methods are called in the reverse order of their registration.
4150 // there is no limit to the number of functions registered. atexit does
4151 // not set errno.
4152
4153 if (PerfAllowAtExitRegistration) {
4154 // only register atexit functions if PerfAllowAtExitRegistration is set.
4155 // atexit functions can be delayed until process exit time, which
4156 // can be problematic for embedded VM situations. Embedded VMs should
4157 // call DestroyJavaVM() to assure that VM resources are released.
4158
4159 // note: perfMemory_exit_helper atexit function may be removed in
4160 // the future if the appropriate cleanup code can be added to the
4161 // VM_Exit VMOperation's doit method.
4162 if (atexit(perfMemory_exit_helper) != 0) {
4163 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4164 }
4165 }
4166
4167 #ifndef _WIN64
4168 // Print something if NX is enabled (win32 on AMD64)
4169 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4170 #endif
4171
4172 // initialize thread priority policy
4173 prio_init();
4174
4175 if (UseNUMA && !ForceNUMA) {
4176 UseNUMA = false; // We don't fully support this yet
4177 }
4178
4179 if (UseNUMAInterleaving) {
4180 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4181 bool success = numa_interleaving_init();
4182 if (!success) UseNUMAInterleaving = false;
4183 }
4184
4185 if (initSock() != JNI_OK) {
4186 return JNI_ERR;
4187 }
4188
4189 return JNI_OK;
4190 }
4191
4192 // Mark the polling page as unreadable
4193 void os::make_polling_page_unreadable(void) {
4194 DWORD old_status;
4195 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4196 PAGE_NOACCESS, &old_status)) {
4197 fatal("Could not disable polling page");
4198 }
4199 }
4200
4201 // Mark the polling page as readable
4202 void os::make_polling_page_readable(void) {
4203 DWORD old_status;
4204 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4205 PAGE_READONLY, &old_status)) {
4206 fatal("Could not enable polling page");
4207 }
4208 }
4209
4210
4211 int os::stat(const char *path, struct stat *sbuf) {
4212 char pathbuf[MAX_PATH];
4213 if (strlen(path) > MAX_PATH - 1) {
4214 errno = ENAMETOOLONG;
4215 return -1;
4216 }
4217 os::native_path(strcpy(pathbuf, path));
4218 int ret = ::stat(pathbuf, sbuf);
4219 if (sbuf != NULL && UseUTCFileTimestamp) {
4220 // Fix for 6539723. st_mtime returned from stat() is dependent on
4221 // the system timezone and so can return different values for the
4222 // same file if/when daylight savings time changes. This adjustment
4223 // makes sure the same timestamp is returned regardless of the TZ.
4224 //
4225 // See:
4226 // http://msdn.microsoft.com/library/
4227 // default.asp?url=/library/en-us/sysinfo/base/
4228 // time_zone_information_str.asp
4229 // and
4230 // http://msdn.microsoft.com/library/default.asp?url=
4231 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4232 //
4233 // NOTE: there is a insidious bug here: If the timezone is changed
4234 // after the call to stat() but before 'GetTimeZoneInformation()', then
4235 // the adjustment we do here will be wrong and we'll return the wrong
4236 // value (which will likely end up creating an invalid class data
4237 // archive). Absent a better API for this, or some time zone locking
4238 // mechanism, we'll have to live with this risk.
4239 TIME_ZONE_INFORMATION tz;
4240 DWORD tzid = GetTimeZoneInformation(&tz);
4241 int daylightBias =
4242 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4243 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4244 }
4245 return ret;
4246 }
4247
4248
4249 #define FT2INT64(ft) \
4250 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4251
4252
4253 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4254 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4255 // of a thread.
4256 //
4257 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4258 // the fast estimate available on the platform.
4259
4260 // current_thread_cpu_time() is not optimized for Windows yet
4261 jlong os::current_thread_cpu_time() {
4262 // return user + sys since the cost is the same
4263 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4264 }
4265
4266 jlong os::thread_cpu_time(Thread* thread) {
4267 // consistent with what current_thread_cpu_time() returns.
4268 return os::thread_cpu_time(thread, true /* user+sys */);
4269 }
4270
4271 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4272 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4273 }
4274
4275 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4276 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4277 // If this function changes, os::is_thread_cpu_time_supported() should too
4278 if (os::win32::is_nt()) {
4279 FILETIME CreationTime;
4280 FILETIME ExitTime;
4281 FILETIME KernelTime;
4282 FILETIME UserTime;
4283
4284 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4285 &ExitTime, &KernelTime, &UserTime) == 0) {
4286 return -1;
4287 } else if (user_sys_cpu_time) {
4288 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4289 } else {
4290 return FT2INT64(UserTime) * 100;
4291 }
4292 } else {
4293 return (jlong) timeGetTime() * 1000000;
4294 }
4295 }
4296
4297 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4298 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4299 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4300 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4301 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4302 }
4303
4304 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4305 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4306 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4307 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4308 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4309 }
4310
4311 bool os::is_thread_cpu_time_supported() {
4312 // see os::thread_cpu_time
4313 if (os::win32::is_nt()) {
4314 FILETIME CreationTime;
4315 FILETIME ExitTime;
4316 FILETIME KernelTime;
4317 FILETIME UserTime;
4318
4319 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4320 &KernelTime, &UserTime) == 0) {
4321 return false;
4322 } else {
4323 return true;
4324 }
4325 } else {
4326 return false;
4327 }
4328 }
4329
4330 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4331 // It does have primitives (PDH API) to get CPU usage and run queue length.
4332 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4333 // If we wanted to implement loadavg on Windows, we have a few options:
4334 //
4335 // a) Query CPU usage and run queue length and "fake" an answer by
4336 // returning the CPU usage if it's under 100%, and the run queue
4337 // length otherwise. It turns out that querying is pretty slow
4338 // on Windows, on the order of 200 microseconds on a fast machine.
4339 // Note that on the Windows the CPU usage value is the % usage
4340 // since the last time the API was called (and the first call
4341 // returns 100%), so we'd have to deal with that as well.
4342 //
4343 // b) Sample the "fake" answer using a sampling thread and store
4344 // the answer in a global variable. The call to loadavg would
4345 // just return the value of the global, avoiding the slow query.
4346 //
4347 // c) Sample a better answer using exponential decay to smooth the
4348 // value. This is basically the algorithm used by UNIX kernels.
4349 //
4350 // Note that sampling thread starvation could affect both (b) and (c).
4351 int os::loadavg(double loadavg[], int nelem) {
4352 return -1;
4353 }
4354
4355
4356 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4357 bool os::dont_yield() {
4358 return DontYieldALot;
4359 }
4360
4361 // This method is a slightly reworked copy of JDK's sysOpen
4362 // from src/windows/hpi/src/sys_api_md.c
4363
4364 int os::open(const char *path, int oflag, int mode) {
4365 char pathbuf[MAX_PATH];
4366
4367 if (strlen(path) > MAX_PATH - 1) {
4368 errno = ENAMETOOLONG;
4369 return -1;
4370 }
4371 os::native_path(strcpy(pathbuf, path));
4372 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4373 }
4374
4375 FILE* os::open(int fd, const char* mode) {
4376 return ::_fdopen(fd, mode);
4377 }
4378
4379 // Is a (classpath) directory empty?
4380 bool os::dir_is_empty(const char* path) {
4381 WIN32_FIND_DATA fd;
4382 HANDLE f = FindFirstFile(path, &fd);
4383 if (f == INVALID_HANDLE_VALUE) {
4384 return true;
4385 }
4386 FindClose(f);
4387 return false;
4388 }
4389
4390 // create binary file, rewriting existing file if required
4391 int os::create_binary_file(const char* path, bool rewrite_existing) {
4392 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4393 if (!rewrite_existing) {
4394 oflags |= _O_EXCL;
4395 }
4396 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4397 }
4398
4399 // return current position of file pointer
4400 jlong os::current_file_offset(int fd) {
4401 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4402 }
4403
4404 // move file pointer to the specified offset
4405 jlong os::seek_to_file_offset(int fd, jlong offset) {
4406 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4407 }
4408
4409
4410 jlong os::lseek(int fd, jlong offset, int whence) {
4411 return (jlong) ::_lseeki64(fd, offset, whence);
4412 }
4413
4414 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4415 OVERLAPPED ov;
4416 DWORD nread;
4417 BOOL result;
4418
4419 ZeroMemory(&ov, sizeof(ov));
4420 ov.Offset = (DWORD)offset;
4421 ov.OffsetHigh = (DWORD)(offset >> 32);
4422
4423 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4424
4425 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4426
4427 return result ? nread : 0;
4428 }
4429
4430
4431 // This method is a slightly reworked copy of JDK's sysNativePath
4432 // from src/windows/hpi/src/path_md.c
4433
4434 // Convert a pathname to native format. On win32, this involves forcing all
4435 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4436 // sometimes rejects '/') and removing redundant separators. The input path is
4437 // assumed to have been converted into the character encoding used by the local
4438 // system. Because this might be a double-byte encoding, care is taken to
4439 // treat double-byte lead characters correctly.
4440 //
4441 // This procedure modifies the given path in place, as the result is never
4442 // longer than the original. There is no error return; this operation always
4443 // succeeds.
4444 char * os::native_path(char *path) {
4445 char *src = path, *dst = path, *end = path;
4446 char *colon = NULL; // If a drive specifier is found, this will
4447 // point to the colon following the drive letter
4448
4449 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4450 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4451 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4452
4453 // Check for leading separators
4454 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4455 while (isfilesep(*src)) {
4456 src++;
4457 }
4458
4459 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4460 // Remove leading separators if followed by drive specifier. This
4461 // hack is necessary to support file URLs containing drive
4462 // specifiers (e.g., "file://c:/path"). As a side effect,
4463 // "/c:/path" can be used as an alternative to "c:/path".
4464 *dst++ = *src++;
4465 colon = dst;
4466 *dst++ = ':';
4467 src++;
4468 } else {
4469 src = path;
4470 if (isfilesep(src[0]) && isfilesep(src[1])) {
4471 // UNC pathname: Retain first separator; leave src pointed at
4472 // second separator so that further separators will be collapsed
4473 // into the second separator. The result will be a pathname
4474 // beginning with "\\\\" followed (most likely) by a host name.
4475 src = dst = path + 1;
4476 path[0] = '\\'; // Force first separator to '\\'
4477 }
4478 }
4479
4480 end = dst;
4481
4482 // Remove redundant separators from remainder of path, forcing all
4483 // separators to be '\\' rather than '/'. Also, single byte space
4484 // characters are removed from the end of the path because those
4485 // are not legal ending characters on this operating system.
4486 //
4487 while (*src != '\0') {
4488 if (isfilesep(*src)) {
4489 *dst++ = '\\'; src++;
4490 while (isfilesep(*src)) src++;
4491 if (*src == '\0') {
4492 // Check for trailing separator
4493 end = dst;
4494 if (colon == dst - 2) break; // "z:\\"
4495 if (dst == path + 1) break; // "\\"
4496 if (dst == path + 2 && isfilesep(path[0])) {
4497 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4498 // beginning of a UNC pathname. Even though it is not, by
4499 // itself, a valid UNC pathname, we leave it as is in order
4500 // to be consistent with the path canonicalizer as well
4501 // as the win32 APIs, which treat this case as an invalid
4502 // UNC pathname rather than as an alias for the root
4503 // directory of the current drive.
4504 break;
4505 }
4506 end = --dst; // Path does not denote a root directory, so
4507 // remove trailing separator
4508 break;
4509 }
4510 end = dst;
4511 } else {
4512 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4513 *dst++ = *src++;
4514 if (*src) *dst++ = *src++;
4515 end = dst;
4516 } else { // Copy a single-byte character
4517 char c = *src++;
4518 *dst++ = c;
4519 // Space is not a legal ending character
4520 if (c != ' ') end = dst;
4521 }
4522 }
4523 }
4524
4525 *end = '\0';
4526
4527 // For "z:", add "." to work around a bug in the C runtime library
4528 if (colon == dst - 1) {
4529 path[2] = '.';
4530 path[3] = '\0';
4531 }
4532
4533 return path;
4534 }
4535
4536 // This code is a copy of JDK's sysSetLength
4537 // from src/windows/hpi/src/sys_api_md.c
4538
4539 int os::ftruncate(int fd, jlong length) {
4540 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4541 long high = (long)(length >> 32);
4542 DWORD ret;
4543
4544 if (h == (HANDLE)(-1)) {
4545 return -1;
4546 }
4547
4548 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4549 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4550 return -1;
4551 }
4552
4553 if (::SetEndOfFile(h) == FALSE) {
4554 return -1;
4555 }
4556
4557 return 0;
4558 }
4559
4560
4561 // This code is a copy of JDK's sysSync
4562 // from src/windows/hpi/src/sys_api_md.c
4563 // except for the legacy workaround for a bug in Win 98
4564
4565 int os::fsync(int fd) {
4566 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4567
4568 if ((!::FlushFileBuffers(handle)) &&
4569 (GetLastError() != ERROR_ACCESS_DENIED)) {
4570 // from winerror.h
4571 return -1;
4572 }
4573 return 0;
4574 }
4575
4576 static int nonSeekAvailable(int, long *);
4577 static int stdinAvailable(int, long *);
4578
4579 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4580 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4581
4582 // This code is a copy of JDK's sysAvailable
4583 // from src/windows/hpi/src/sys_api_md.c
4584
4585 int os::available(int fd, jlong *bytes) {
4586 jlong cur, end;
4587 struct _stati64 stbuf64;
4588
4589 if (::_fstati64(fd, &stbuf64) >= 0) {
4590 int mode = stbuf64.st_mode;
4591 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4592 int ret;
4593 long lpbytes;
4594 if (fd == 0) {
4595 ret = stdinAvailable(fd, &lpbytes);
4596 } else {
4597 ret = nonSeekAvailable(fd, &lpbytes);
4598 }
4599 (*bytes) = (jlong)(lpbytes);
4600 return ret;
4601 }
4602 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4603 return FALSE;
4604 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4605 return FALSE;
4606 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4607 return FALSE;
4608 }
4609 *bytes = end - cur;
4610 return TRUE;
4611 } else {
4612 return FALSE;
4613 }
4614 }
4615
4616 // This code is a copy of JDK's nonSeekAvailable
4617 // from src/windows/hpi/src/sys_api_md.c
4618
4619 static int nonSeekAvailable(int fd, long *pbytes) {
4620 // This is used for available on non-seekable devices
4621 // (like both named and anonymous pipes, such as pipes
4622 // connected to an exec'd process).
4623 // Standard Input is a special case.
4624 HANDLE han;
4625
4626 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4627 return FALSE;
4628 }
4629
4630 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4631 // PeekNamedPipe fails when at EOF. In that case we
4632 // simply make *pbytes = 0 which is consistent with the
4633 // behavior we get on Solaris when an fd is at EOF.
4634 // The only alternative is to raise an Exception,
4635 // which isn't really warranted.
4636 //
4637 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4638 return FALSE;
4639 }
4640 *pbytes = 0;
4641 }
4642 return TRUE;
4643 }
4644
4645 #define MAX_INPUT_EVENTS 2000
4646
4647 // This code is a copy of JDK's stdinAvailable
4648 // from src/windows/hpi/src/sys_api_md.c
4649
4650 static int stdinAvailable(int fd, long *pbytes) {
4651 HANDLE han;
4652 DWORD numEventsRead = 0; // Number of events read from buffer
4653 DWORD numEvents = 0; // Number of events in buffer
4654 DWORD i = 0; // Loop index
4655 DWORD curLength = 0; // Position marker
4656 DWORD actualLength = 0; // Number of bytes readable
4657 BOOL error = FALSE; // Error holder
4658 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4659
4660 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4661 return FALSE;
4662 }
4663
4664 // Construct an array of input records in the console buffer
4665 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4666 if (error == 0) {
4667 return nonSeekAvailable(fd, pbytes);
4668 }
4669
4670 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4671 if (numEvents > MAX_INPUT_EVENTS) {
4672 numEvents = MAX_INPUT_EVENTS;
4673 }
4674
4675 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4676 if (lpBuffer == NULL) {
4677 return FALSE;
4678 }
4679
4680 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4681 if (error == 0) {
4682 os::free(lpBuffer);
4683 return FALSE;
4684 }
4685
4686 // Examine input records for the number of bytes available
4687 for (i=0; i<numEvents; i++) {
4688 if (lpBuffer[i].EventType == KEY_EVENT) {
4689
4690 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4691 &(lpBuffer[i].Event);
4692 if (keyRecord->bKeyDown == TRUE) {
4693 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4694 curLength++;
4695 if (*keyPressed == '\r') {
4696 actualLength = curLength;
4697 }
4698 }
4699 }
4700 }
4701
4702 if (lpBuffer != NULL) {
4703 os::free(lpBuffer);
4704 }
4705
4706 *pbytes = (long) actualLength;
4707 return TRUE;
4708 }
4709
4710 // Map a block of memory.
4711 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4712 char *addr, size_t bytes, bool read_only,
4713 bool allow_exec) {
4714 HANDLE hFile;
4715 char* base;
4716
4717 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4718 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4719 if (hFile == NULL) {
4720 if (PrintMiscellaneous && Verbose) {
4721 DWORD err = GetLastError();
4722 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4723 }
4724 return NULL;
4725 }
4726
4727 if (allow_exec) {
4728 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4729 // unless it comes from a PE image (which the shared archive is not.)
4730 // Even VirtualProtect refuses to give execute access to mapped memory
4731 // that was not previously executable.
4732 //
4733 // Instead, stick the executable region in anonymous memory. Yuck.
4734 // Penalty is that ~4 pages will not be shareable - in the future
4735 // we might consider DLLizing the shared archive with a proper PE
4736 // header so that mapping executable + sharing is possible.
4737
4738 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4739 PAGE_READWRITE);
4740 if (base == NULL) {
4741 if (PrintMiscellaneous && Verbose) {
4742 DWORD err = GetLastError();
4743 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4744 }
4745 CloseHandle(hFile);
4746 return NULL;
4747 }
4748
4749 DWORD bytes_read;
4750 OVERLAPPED overlapped;
4751 overlapped.Offset = (DWORD)file_offset;
4752 overlapped.OffsetHigh = 0;
4753 overlapped.hEvent = NULL;
4754 // ReadFile guarantees that if the return value is true, the requested
4755 // number of bytes were read before returning.
4756 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4757 if (!res) {
4758 if (PrintMiscellaneous && Verbose) {
4759 DWORD err = GetLastError();
4760 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4761 }
4762 release_memory(base, bytes);
4763 CloseHandle(hFile);
4764 return NULL;
4765 }
4766 } else {
4767 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4768 NULL /* file_name */);
4769 if (hMap == NULL) {
4770 if (PrintMiscellaneous && Verbose) {
4771 DWORD err = GetLastError();
4772 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4773 }
4774 CloseHandle(hFile);
4775 return NULL;
4776 }
4777
4778 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4779 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4780 (DWORD)bytes, addr);
4781 if (base == NULL) {
4782 if (PrintMiscellaneous && Verbose) {
4783 DWORD err = GetLastError();
4784 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4785 }
4786 CloseHandle(hMap);
4787 CloseHandle(hFile);
4788 return NULL;
4789 }
4790
4791 if (CloseHandle(hMap) == 0) {
4792 if (PrintMiscellaneous && Verbose) {
4793 DWORD err = GetLastError();
4794 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4795 }
4796 CloseHandle(hFile);
4797 return base;
4798 }
4799 }
4800
4801 if (allow_exec) {
4802 DWORD old_protect;
4803 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4804 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4805
4806 if (!res) {
4807 if (PrintMiscellaneous && Verbose) {
4808 DWORD err = GetLastError();
4809 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4810 }
4811 // Don't consider this a hard error, on IA32 even if the
4812 // VirtualProtect fails, we should still be able to execute
4813 CloseHandle(hFile);
4814 return base;
4815 }
4816 }
4817
4818 if (CloseHandle(hFile) == 0) {
4819 if (PrintMiscellaneous && Verbose) {
4820 DWORD err = GetLastError();
4821 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4822 }
4823 return base;
4824 }
4825
4826 return base;
4827 }
4828
4829
4830 // Remap a block of memory.
4831 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4832 char *addr, size_t bytes, bool read_only,
4833 bool allow_exec) {
4834 // This OS does not allow existing memory maps to be remapped so we
4835 // have to unmap the memory before we remap it.
4836 if (!os::unmap_memory(addr, bytes)) {
4837 return NULL;
4838 }
4839
4840 // There is a very small theoretical window between the unmap_memory()
4841 // call above and the map_memory() call below where a thread in native
4842 // code may be able to access an address that is no longer mapped.
4843
4844 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4845 read_only, allow_exec);
4846 }
4847
4848
4849 // Unmap a block of memory.
4850 // Returns true=success, otherwise false.
4851
4852 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4853 BOOL result = UnmapViewOfFile(addr);
4854 if (result == 0) {
4855 if (PrintMiscellaneous && Verbose) {
4856 DWORD err = GetLastError();
4857 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4858 }
4859 return false;
4860 }
4861 return true;
4862 }
4863
4864 void os::pause() {
4865 char filename[MAX_PATH];
4866 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4867 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4868 } else {
4869 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4870 }
4871
4872 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4873 if (fd != -1) {
4874 struct stat buf;
4875 ::close(fd);
4876 while (::stat(filename, &buf) == 0) {
4877 Sleep(100);
4878 }
4879 } else {
4880 jio_fprintf(stderr,
4881 "Could not open pause file '%s', continuing immediately.\n", filename);
4882 }
4883 }
4884
4885 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4886 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4887 }
4888
4889 // See the caveats for this class in os_windows.hpp
4890 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4891 // into this method and returns false. If no OS EXCEPTION was raised, returns
4892 // true.
4893 // The callback is supposed to provide the method that should be protected.
4894 //
4895 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4896 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4897 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4898 "crash_protection already set?");
4899
4900 bool success = true;
4901 __try {
4902 WatcherThread::watcher_thread()->set_crash_protection(this);
4903 cb.call();
4904 } __except(EXCEPTION_EXECUTE_HANDLER) {
4905 // only for protection, nothing to do
4906 success = false;
4907 }
4908 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4909 return success;
4910 }
4911
4912 // An Event wraps a win32 "CreateEvent" kernel handle.
4913 //
4914 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4915 //
4916 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4917 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4918 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4919 // In addition, an unpark() operation might fetch the handle field, but the
4920 // event could recycle between the fetch and the SetEvent() operation.
4921 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4922 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4923 // on an stale but recycled handle would be harmless, but in practice this might
4924 // confuse other non-Sun code, so it's not a viable approach.
4925 //
4926 // 2: Once a win32 event handle is associated with an Event, it remains associated
4927 // with the Event. The event handle is never closed. This could be construed
4928 // as handle leakage, but only up to the maximum # of threads that have been extant
4929 // at any one time. This shouldn't be an issue, as windows platforms typically
4930 // permit a process to have hundreds of thousands of open handles.
4931 //
4932 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4933 // and release unused handles.
4934 //
4935 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4936 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4937 //
4938 // 5. Use an RCU-like mechanism (Read-Copy Update).
4939 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4940 //
4941 // We use (2).
4942 //
4943 // TODO-FIXME:
4944 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4945 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4946 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4947 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4948 // into a single win32 CreateEvent() handle.
4949 //
4950 // Assumption:
4951 // Only one parker can exist on an event, which is why we allocate
4952 // them per-thread. Multiple unparkers can coexist.
4953 //
4954 // _Event transitions in park()
4955 // -1 => -1 : illegal
4956 // 1 => 0 : pass - return immediately
4957 // 0 => -1 : block; then set _Event to 0 before returning
4958 //
4959 // _Event transitions in unpark()
4960 // 0 => 1 : just return
4961 // 1 => 1 : just return
4962 // -1 => either 0 or 1; must signal target thread
4963 // That is, we can safely transition _Event from -1 to either
4964 // 0 or 1.
4965 //
4966 // _Event serves as a restricted-range semaphore.
4967 // -1 : thread is blocked, i.e. there is a waiter
4968 // 0 : neutral: thread is running or ready,
4969 // could have been signaled after a wait started
4970 // 1 : signaled - thread is running or ready
4971 //
4972 // Another possible encoding of _Event would be with
4973 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4974 //
4975
4976 int os::PlatformEvent::park(jlong Millis) {
4977 // Transitions for _Event:
4978 // -1 => -1 : illegal
4979 // 1 => 0 : pass - return immediately
4980 // 0 => -1 : block; then set _Event to 0 before returning
4981
4982 guarantee(_ParkHandle != NULL , "Invariant");
4983 guarantee(Millis > 0 , "Invariant");
4984
4985 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4986 // the initial park() operation.
4987 // Consider: use atomic decrement instead of CAS-loop
4988
4989 int v;
4990 for (;;) {
4991 v = _Event;
4992 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4993 }
4994 guarantee((v == 0) || (v == 1), "invariant");
4995 if (v != 0) return OS_OK;
4996
4997 // Do this the hard way by blocking ...
4998 // TODO: consider a brief spin here, gated on the success of recent
4999 // spin attempts by this thread.
5000 //
5001 // We decompose long timeouts into series of shorter timed waits.
5002 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5003 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5004 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5005 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5006 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5007 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5008 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5009 // for the already waited time. This policy does not admit any new outcomes.
5010 // In the future, however, we might want to track the accumulated wait time and
5011 // adjust Millis accordingly if we encounter a spurious wakeup.
5012
5013 const int MAXTIMEOUT = 0x10000000;
5014 DWORD rv = WAIT_TIMEOUT;
5015 while (_Event < 0 && Millis > 0) {
5016 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5017 if (Millis > MAXTIMEOUT) {
5018 prd = MAXTIMEOUT;
5019 }
5020 rv = ::WaitForSingleObject(_ParkHandle, prd);
5021 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5022 if (rv == WAIT_TIMEOUT) {
5023 Millis -= prd;
5024 }
5025 }
5026 v = _Event;
5027 _Event = 0;
5028 // see comment at end of os::PlatformEvent::park() below:
5029 OrderAccess::fence();
5030 // If we encounter a nearly simultanous timeout expiry and unpark()
5031 // we return OS_OK indicating we awoke via unpark().
5032 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5033 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5034 }
5035
5036 void os::PlatformEvent::park() {
5037 // Transitions for _Event:
5038 // -1 => -1 : illegal
5039 // 1 => 0 : pass - return immediately
5040 // 0 => -1 : block; then set _Event to 0 before returning
5041
5042 guarantee(_ParkHandle != NULL, "Invariant");
5043 // Invariant: Only the thread associated with the Event/PlatformEvent
5044 // may call park().
5045 // Consider: use atomic decrement instead of CAS-loop
5046 int v;
5047 for (;;) {
5048 v = _Event;
5049 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5050 }
5051 guarantee((v == 0) || (v == 1), "invariant");
5052 if (v != 0) return;
5053
5054 // Do this the hard way by blocking ...
5055 // TODO: consider a brief spin here, gated on the success of recent
5056 // spin attempts by this thread.
5057 while (_Event < 0) {
5058 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5059 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5060 }
5061
5062 // Usually we'll find _Event == 0 at this point, but as
5063 // an optional optimization we clear it, just in case can
5064 // multiple unpark() operations drove _Event up to 1.
5065 _Event = 0;
5066 OrderAccess::fence();
5067 guarantee(_Event >= 0, "invariant");
5068 }
5069
5070 void os::PlatformEvent::unpark() {
5071 guarantee(_ParkHandle != NULL, "Invariant");
5072
5073 // Transitions for _Event:
5074 // 0 => 1 : just return
5075 // 1 => 1 : just return
5076 // -1 => either 0 or 1; must signal target thread
5077 // That is, we can safely transition _Event from -1 to either
5078 // 0 or 1.
5079 // See also: "Semaphores in Plan 9" by Mullender & Cox
5080 //
5081 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5082 // that it will take two back-to-back park() calls for the owning
5083 // thread to block. This has the benefit of forcing a spurious return
5084 // from the first park() call after an unpark() call which will help
5085 // shake out uses of park() and unpark() without condition variables.
5086
5087 if (Atomic::xchg(1, &_Event) >= 0) return;
5088
5089 ::SetEvent(_ParkHandle);
5090 }
5091
5092
5093 // JSR166
5094 // -------------------------------------------------------
5095
5096 // The Windows implementation of Park is very straightforward: Basic
5097 // operations on Win32 Events turn out to have the right semantics to
5098 // use them directly. We opportunistically resuse the event inherited
5099 // from Monitor.
5100
5101 void Parker::park(bool isAbsolute, jlong time) {
5102 guarantee(_ParkEvent != NULL, "invariant");
5103 // First, demultiplex/decode time arguments
5104 if (time < 0) { // don't wait
5105 return;
5106 } else if (time == 0 && !isAbsolute) {
5107 time = INFINITE;
5108 } else if (isAbsolute) {
5109 time -= os::javaTimeMillis(); // convert to relative time
5110 if (time <= 0) { // already elapsed
5111 return;
5112 }
5113 } else { // relative
5114 time /= 1000000; // Must coarsen from nanos to millis
5115 if (time == 0) { // Wait for the minimal time unit if zero
5116 time = 1;
5117 }
5118 }
5119
5120 JavaThread* thread = (JavaThread*)(Thread::current());
5121 assert(thread->is_Java_thread(), "Must be JavaThread");
5122 JavaThread *jt = (JavaThread *)thread;
5123
5124 // Don't wait if interrupted or already triggered
5125 if (Thread::is_interrupted(thread, false) ||
5126 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5127 ResetEvent(_ParkEvent);
5128 return;
5129 } else {
5130 ThreadBlockInVM tbivm(jt);
5131 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5132 jt->set_suspend_equivalent();
5133
5134 WaitForSingleObject(_ParkEvent, time);
5135 ResetEvent(_ParkEvent);
5136
5137 // If externally suspended while waiting, re-suspend
5138 if (jt->handle_special_suspend_equivalent_condition()) {
5139 jt->java_suspend_self();
5140 }
5141 }
5142 }
5143
5144 void Parker::unpark() {
5145 guarantee(_ParkEvent != NULL, "invariant");
5146 SetEvent(_ParkEvent);
5147 }
5148
5149 // Run the specified command in a separate process. Return its exit value,
5150 // or -1 on failure (e.g. can't create a new process).
5151 int os::fork_and_exec(char* cmd) {
5152 STARTUPINFO si;
5153 PROCESS_INFORMATION pi;
5154
5155 memset(&si, 0, sizeof(si));
5156 si.cb = sizeof(si);
5157 memset(&pi, 0, sizeof(pi));
5158 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5159 cmd, // command line
5160 NULL, // process security attribute
5161 NULL, // thread security attribute
5162 TRUE, // inherits system handles
5163 0, // no creation flags
5164 NULL, // use parent's environment block
5165 NULL, // use parent's starting directory
5166 &si, // (in) startup information
5167 &pi); // (out) process information
5168
5169 if (rslt) {
5170 // Wait until child process exits.
5171 WaitForSingleObject(pi.hProcess, INFINITE);
5172
5173 DWORD exit_code;
5174 GetExitCodeProcess(pi.hProcess, &exit_code);
5175
5176 // Close process and thread handles.
5177 CloseHandle(pi.hProcess);
5178 CloseHandle(pi.hThread);
5179
5180 return (int)exit_code;
5181 } else {
5182 return -1;
5183 }
5184 }
5185
5186 //--------------------------------------------------------------------------------------------------
5187 // Non-product code
5188
5189 static int mallocDebugIntervalCounter = 0;
5190 static int mallocDebugCounter = 0;
5191 bool os::check_heap(bool force) {
5192 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5193 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5194 // Note: HeapValidate executes two hardware breakpoints when it finds something
5195 // wrong; at these points, eax contains the address of the offending block (I think).
5196 // To get to the exlicit error message(s) below, just continue twice.
5197 HANDLE heap = GetProcessHeap();
5198
5199 // If we fail to lock the heap, then gflags.exe has been used
5200 // or some other special heap flag has been set that prevents
5201 // locking. We don't try to walk a heap we can't lock.
5202 if (HeapLock(heap) != 0) {
5203 PROCESS_HEAP_ENTRY phe;
5204 phe.lpData = NULL;
5205 while (HeapWalk(heap, &phe) != 0) {
5206 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5207 !HeapValidate(heap, 0, phe.lpData)) {
5208 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5209 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5210 fatal("corrupted C heap");
5211 }
5212 }
5213 DWORD err = GetLastError();
5214 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5215 fatal(err_msg("heap walk aborted with error %d", err));
5216 }
5217 HeapUnlock(heap);
5218 }
5219 mallocDebugIntervalCounter = 0;
5220 }
5221 return true;
5222 }
5223
5224
5225 bool os::find(address addr, outputStream* st) {
5226 // Nothing yet
5227 return false;
5228 }
5229
5230 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5231 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5232
5233 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5234 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5235 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5236 address addr = (address) exceptionRecord->ExceptionInformation[1];
5237
5238 if (os::is_memory_serialize_page(thread, addr)) {
5239 return EXCEPTION_CONTINUE_EXECUTION;
5240 }
5241 }
5242
5243 return EXCEPTION_CONTINUE_SEARCH;
5244 }
5245
5246 // We don't build a headless jre for Windows
5247 bool os::is_headless_jre() { return false; }
5248
5249 static jint initSock() {
5250 WSADATA wsadata;
5251
5252 if (!os::WinSock2Dll::WinSock2Available()) {
5253 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5254 ::GetLastError());
5255 return JNI_ERR;
5256 }
5257
5258 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5259 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5260 ::GetLastError());
5261 return JNI_ERR;
5262 }
5263 return JNI_OK;
5264 }
5265
5266 struct hostent* os::get_host_by_name(char* name) {
5267 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5268 }
5269
5270 int os::socket_close(int fd) {
5271 return ::closesocket(fd);
5272 }
5273
5274 int os::socket(int domain, int type, int protocol) {
5275 return ::socket(domain, type, protocol);
5276 }
5277
5278 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5279 return ::connect(fd, him, len);
5280 }
5281
5282 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5283 return ::recv(fd, buf, (int)nBytes, flags);
5284 }
5285
5286 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5287 return ::send(fd, buf, (int)nBytes, flags);
5288 }
5289
5290 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5291 return ::send(fd, buf, (int)nBytes, flags);
5292 }
5293
5294 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5295 #if defined(IA32)
5296 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5297 #elif defined (AMD64)
5298 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5299 #endif
5300
5301 // returns true if thread could be suspended,
5302 // false otherwise
5303 static bool do_suspend(HANDLE* h) {
5304 if (h != NULL) {
5305 if (SuspendThread(*h) != ~0) {
5306 return true;
5307 }
5308 }
5309 return false;
5310 }
5311
5312 // resume the thread
5313 // calling resume on an active thread is a no-op
5314 static void do_resume(HANDLE* h) {
5315 if (h != NULL) {
5316 ResumeThread(*h);
5317 }
5318 }
5319
5320 // retrieve a suspend/resume context capable handle
5321 // from the tid. Caller validates handle return value.
5322 void get_thread_handle_for_extended_context(HANDLE* h,
5323 OSThread::thread_id_t tid) {
5324 if (h != NULL) {
5325 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5326 }
5327 }
5328
5329 // Thread sampling implementation
5330 //
5331 void os::SuspendedThreadTask::internal_do_task() {
5332 CONTEXT ctxt;
5333 HANDLE h = NULL;
5334
5335 // get context capable handle for thread
5336 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5337
5338 // sanity
5339 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5340 return;
5341 }
5342
5343 // suspend the thread
5344 if (do_suspend(&h)) {
5345 ctxt.ContextFlags = sampling_context_flags;
5346 // get thread context
5347 GetThreadContext(h, &ctxt);
5348 SuspendedThreadTaskContext context(_thread, &ctxt);
5349 // pass context to Thread Sampling impl
5350 do_task(context);
5351 // resume thread
5352 do_resume(&h);
5353 }
5354
5355 // close handle
5356 CloseHandle(h);
5357 }
5358
5359
5360 // Kernel32 API
5361 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5362 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5363 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5364 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5365 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5366
5367 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5368 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5369 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5370 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5371 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5372
5373
5374 BOOL os::Kernel32Dll::initialized = FALSE;
5375 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5376 assert(initialized && _GetLargePageMinimum != NULL,
5377 "GetLargePageMinimumAvailable() not yet called");
5378 return _GetLargePageMinimum();
5379 }
5380
5381 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5382 if (!initialized) {
5383 initialize();
5384 }
5385 return _GetLargePageMinimum != NULL;
5386 }
5387
5388 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5389 if (!initialized) {
5390 initialize();
5391 }
5392 return _VirtualAllocExNuma != NULL;
5393 }
5394
5395 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5396 SIZE_T bytes, DWORD flags,
5397 DWORD prot, DWORD node) {
5398 assert(initialized && _VirtualAllocExNuma != NULL,
5399 "NUMACallsAvailable() not yet called");
5400
5401 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5402 }
5403
5404 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5405 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5406 "NUMACallsAvailable() not yet called");
5407
5408 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5409 }
5410
5411 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5412 PULONGLONG proc_mask) {
5413 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5414 "NUMACallsAvailable() not yet called");
5415
5416 return _GetNumaNodeProcessorMask(node, proc_mask);
5417 }
5418
5419 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5420 ULONG FrameToCapture,
5421 PVOID* BackTrace,
5422 PULONG BackTraceHash) {
5423 if (!initialized) {
5424 initialize();
5425 }
5426
5427 if (_RtlCaptureStackBackTrace != NULL) {
5428 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5429 BackTrace, BackTraceHash);
5430 } else {
5431 return 0;
5432 }
5433 }
5434
5435 void os::Kernel32Dll::initializeCommon() {
5436 if (!initialized) {
5437 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5438 assert(handle != NULL, "Just check");
5439 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5440 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5441 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5442 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5443 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5444 initialized = TRUE;
5445 }
5446 }
5447
5448
5449
5450 #ifndef JDK6_OR_EARLIER
5451
5452 void os::Kernel32Dll::initialize() {
5453 initializeCommon();
5454 }
5455
5456
5457 // Kernel32 API
5458 inline BOOL os::Kernel32Dll::SwitchToThread() {
5459 return ::SwitchToThread();
5460 }
5461
5462 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5463 return true;
5464 }
5465
5466 // Help tools
5467 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5468 return true;
5469 }
5470
5471 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5472 DWORD th32ProcessId) {
5473 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5474 }
5475
5476 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5477 LPMODULEENTRY32 lpme) {
5478 return ::Module32First(hSnapshot, lpme);
5479 }
5480
5481 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5482 LPMODULEENTRY32 lpme) {
5483 return ::Module32Next(hSnapshot, lpme);
5484 }
5485
5486 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5487 ::GetNativeSystemInfo(lpSystemInfo);
5488 }
5489
5490 // PSAPI API
5491 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5492 HMODULE *lpModule, DWORD cb,
5493 LPDWORD lpcbNeeded) {
5494 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5495 }
5496
5497 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5498 HMODULE hModule,
5499 LPTSTR lpFilename,
5500 DWORD nSize) {
5501 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5502 }
5503
5504 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5505 HMODULE hModule,
5506 LPMODULEINFO lpmodinfo,
5507 DWORD cb) {
5508 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5509 }
5510
5511 inline BOOL os::PSApiDll::PSApiAvailable() {
5512 return true;
5513 }
5514
5515
5516 // WinSock2 API
5517 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5518 LPWSADATA lpWSAData) {
5519 return ::WSAStartup(wVersionRequested, lpWSAData);
5520 }
5521
5522 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5523 return ::gethostbyname(name);
5524 }
5525
5526 inline BOOL os::WinSock2Dll::WinSock2Available() {
5527 return true;
5528 }
5529
5530 // Advapi API
5531 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5532 BOOL DisableAllPrivileges,
5533 PTOKEN_PRIVILEGES NewState,
5534 DWORD BufferLength,
5535 PTOKEN_PRIVILEGES PreviousState,
5536 PDWORD ReturnLength) {
5537 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5538 BufferLength, PreviousState, ReturnLength);
5539 }
5540
5541 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5542 DWORD DesiredAccess,
5543 PHANDLE TokenHandle) {
5544 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5545 }
5546
5547 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5548 LPCTSTR lpName,
5549 PLUID lpLuid) {
5550 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5551 }
5552
5553 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5554 return true;
5555 }
5556
5557 void* os::get_default_process_handle() {
5558 return (void*)GetModuleHandle(NULL);
5559 }
5560
5561 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5562 // which is used to find statically linked in agents.
5563 // Additionally for windows, takes into account __stdcall names.
5564 // Parameters:
5565 // sym_name: Symbol in library we are looking for
5566 // lib_name: Name of library to look in, NULL for shared libs.
5567 // is_absolute_path == true if lib_name is absolute path to agent
5568 // such as "C:/a/b/L.dll"
5569 // == false if only the base name of the library is passed in
5570 // such as "L"
5571 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5572 bool is_absolute_path) {
5573 char *agent_entry_name;
5574 size_t len;
5575 size_t name_len;
5576 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5577 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5578 const char *start;
5579
5580 if (lib_name != NULL) {
5581 len = name_len = strlen(lib_name);
5582 if (is_absolute_path) {
5583 // Need to strip path, prefix and suffix
5584 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5585 lib_name = ++start;
5586 } else {
5587 // Need to check for drive prefix
5588 if ((start = strchr(lib_name, ':')) != NULL) {
5589 lib_name = ++start;
5590 }
5591 }
5592 if (len <= (prefix_len + suffix_len)) {
5593 return NULL;
5594 }
5595 lib_name += prefix_len;
5596 name_len = strlen(lib_name) - suffix_len;
5597 }
5598 }
5599 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5600 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5601 if (agent_entry_name == NULL) {
5602 return NULL;
5603 }
5604 if (lib_name != NULL) {
5605 const char *p = strrchr(sym_name, '@');
5606 if (p != NULL && p != sym_name) {
5607 // sym_name == _Agent_OnLoad@XX
5608 strncpy(agent_entry_name, sym_name, (p - sym_name));
5609 agent_entry_name[(p-sym_name)] = '\0';
5610 // agent_entry_name == _Agent_OnLoad
5611 strcat(agent_entry_name, "_");
5612 strncat(agent_entry_name, lib_name, name_len);
5613 strcat(agent_entry_name, p);
5614 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5615 } else {
5616 strcpy(agent_entry_name, sym_name);
5617 strcat(agent_entry_name, "_");
5618 strncat(agent_entry_name, lib_name, name_len);
5619 }
5620 } else {
5621 strcpy(agent_entry_name, sym_name);
5622 }
5623 return agent_entry_name;
5624 }
5625
5626 #else
5627 // Kernel32 API
5628 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5629 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5630 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5631 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5632 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5633
5634 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5635 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5636 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5637 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5638 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5639
5640 void os::Kernel32Dll::initialize() {
5641 if (!initialized) {
5642 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5643 assert(handle != NULL, "Just check");
5644
5645 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5646 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5647 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5648 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5649 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5650 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5651 initializeCommon(); // resolve the functions that always need resolving
5652
5653 initialized = TRUE;
5654 }
5655 }
5656
5657 BOOL os::Kernel32Dll::SwitchToThread() {
5658 assert(initialized && _SwitchToThread != NULL,
5659 "SwitchToThreadAvailable() not yet called");
5660 return _SwitchToThread();
5661 }
5662
5663
5664 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5665 if (!initialized) {
5666 initialize();
5667 }
5668 return _SwitchToThread != NULL;
5669 }
5670
5671 // Help tools
5672 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5673 if (!initialized) {
5674 initialize();
5675 }
5676 return _CreateToolhelp32Snapshot != NULL &&
5677 _Module32First != NULL &&
5678 _Module32Next != NULL;
5679 }
5680
5681 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5682 DWORD th32ProcessId) {
5683 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5684 "HelpToolsAvailable() not yet called");
5685
5686 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5687 }
5688
5689 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5690 assert(initialized && _Module32First != NULL,
5691 "HelpToolsAvailable() not yet called");
5692
5693 return _Module32First(hSnapshot, lpme);
5694 }
5695
5696 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5697 LPMODULEENTRY32 lpme) {
5698 assert(initialized && _Module32Next != NULL,
5699 "HelpToolsAvailable() not yet called");
5700
5701 return _Module32Next(hSnapshot, lpme);
5702 }
5703
5704
5705 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5706 if (!initialized) {
5707 initialize();
5708 }
5709 return _GetNativeSystemInfo != NULL;
5710 }
5711
5712 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5713 assert(initialized && _GetNativeSystemInfo != NULL,
5714 "GetNativeSystemInfoAvailable() not yet called");
5715
5716 _GetNativeSystemInfo(lpSystemInfo);
5717 }
5718
5719 // PSAPI API
5720
5721
5722 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5723 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5724 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5725
5726 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5727 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5728 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5729 BOOL os::PSApiDll::initialized = FALSE;
5730
5731 void os::PSApiDll::initialize() {
5732 if (!initialized) {
5733 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5734 if (handle != NULL) {
5735 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5736 "EnumProcessModules");
5737 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5738 "GetModuleFileNameExA");
5739 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5740 "GetModuleInformation");
5741 }
5742 initialized = TRUE;
5743 }
5744 }
5745
5746
5747
5748 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5749 DWORD cb, LPDWORD lpcbNeeded) {
5750 assert(initialized && _EnumProcessModules != NULL,
5751 "PSApiAvailable() not yet called");
5752 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5753 }
5754
5755 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5756 LPTSTR lpFilename, DWORD nSize) {
5757 assert(initialized && _GetModuleFileNameEx != NULL,
5758 "PSApiAvailable() not yet called");
5759 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5760 }
5761
5762 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5763 LPMODULEINFO lpmodinfo, DWORD cb) {
5764 assert(initialized && _GetModuleInformation != NULL,
5765 "PSApiAvailable() not yet called");
5766 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5767 }
5768
5769 BOOL os::PSApiDll::PSApiAvailable() {
5770 if (!initialized) {
5771 initialize();
5772 }
5773 return _EnumProcessModules != NULL &&
5774 _GetModuleFileNameEx != NULL &&
5775 _GetModuleInformation != NULL;
5776 }
5777
5778
5779 // WinSock2 API
5780 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5781 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5782
5783 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5784 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5785 BOOL os::WinSock2Dll::initialized = FALSE;
5786
5787 void os::WinSock2Dll::initialize() {
5788 if (!initialized) {
5789 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5790 if (handle != NULL) {
5791 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5792 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5793 }
5794 initialized = TRUE;
5795 }
5796 }
5797
5798
5799 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5800 assert(initialized && _WSAStartup != NULL,
5801 "WinSock2Available() not yet called");
5802 return _WSAStartup(wVersionRequested, lpWSAData);
5803 }
5804
5805 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5806 assert(initialized && _gethostbyname != NULL,
5807 "WinSock2Available() not yet called");
5808 return _gethostbyname(name);
5809 }
5810
5811 BOOL os::WinSock2Dll::WinSock2Available() {
5812 if (!initialized) {
5813 initialize();
5814 }
5815 return _WSAStartup != NULL &&
5816 _gethostbyname != NULL;
5817 }
5818
5819 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5820 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5821 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5822
5823 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5824 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5825 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5826 BOOL os::Advapi32Dll::initialized = FALSE;
5827
5828 void os::Advapi32Dll::initialize() {
5829 if (!initialized) {
5830 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5831 if (handle != NULL) {
5832 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5833 "AdjustTokenPrivileges");
5834 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5835 "OpenProcessToken");
5836 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5837 "LookupPrivilegeValueA");
5838 }
5839 initialized = TRUE;
5840 }
5841 }
5842
5843 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5844 BOOL DisableAllPrivileges,
5845 PTOKEN_PRIVILEGES NewState,
5846 DWORD BufferLength,
5847 PTOKEN_PRIVILEGES PreviousState,
5848 PDWORD ReturnLength) {
5849 assert(initialized && _AdjustTokenPrivileges != NULL,
5850 "AdvapiAvailable() not yet called");
5851 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5852 BufferLength, PreviousState, ReturnLength);
5853 }
5854
5855 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5856 DWORD DesiredAccess,
5857 PHANDLE TokenHandle) {
5858 assert(initialized && _OpenProcessToken != NULL,
5859 "AdvapiAvailable() not yet called");
5860 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5861 }
5862
5863 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5864 LPCTSTR lpName, PLUID lpLuid) {
5865 assert(initialized && _LookupPrivilegeValue != NULL,
5866 "AdvapiAvailable() not yet called");
5867 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5868 }
5869
5870 BOOL os::Advapi32Dll::AdvapiAvailable() {
5871 if (!initialized) {
5872 initialize();
5873 }
5874 return _AdjustTokenPrivileges != NULL &&
5875 _OpenProcessToken != NULL &&
5876 _LookupPrivilegeValue != NULL;
5877 }
5878
5879 #endif
5880
5881 #ifndef PRODUCT
5882
5883 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5884 // contiguous memory block at a particular address.
5885 // The test first tries to find a good approximate address to allocate at by using the same
5886 // method to allocate some memory at any address. The test then tries to allocate memory in
5887 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5888 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5889 // the previously allocated memory is available for allocation. The only actual failure
5890 // that is reported is when the test tries to allocate at a particular location but gets a
5891 // different valid one. A NULL return value at this point is not considered an error but may
5892 // be legitimate.
5893 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5894 void TestReserveMemorySpecial_test() {
5895 if (!UseLargePages) {
5896 if (VerboseInternalVMTests) {
5897 gclog_or_tty->print("Skipping test because large pages are disabled");
5898 }
5899 return;
5900 }
5901 // save current value of globals
5902 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5903 bool old_use_numa_interleaving = UseNUMAInterleaving;
5904
5905 // set globals to make sure we hit the correct code path
5906 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5907
5908 // do an allocation at an address selected by the OS to get a good one.
5909 const size_t large_allocation_size = os::large_page_size() * 4;
5910 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5911 if (result == NULL) {
5912 if (VerboseInternalVMTests) {
5913 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5914 large_allocation_size);
5915 }
5916 } else {
5917 os::release_memory_special(result, large_allocation_size);
5918
5919 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5920 // we managed to get it once.
5921 const size_t expected_allocation_size = os::large_page_size();
5922 char* expected_location = result + os::large_page_size();
5923 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5924 if (actual_location == NULL) {
5925 if (VerboseInternalVMTests) {
5926 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5927 expected_location, large_allocation_size);
5928 }
5929 } else {
5930 // release memory
5931 os::release_memory_special(actual_location, expected_allocation_size);
5932 // only now check, after releasing any memory to avoid any leaks.
5933 assert(actual_location == expected_location,
5934 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5935 expected_location, expected_allocation_size, actual_location));
5936 }
5937 }
5938
5939 // restore globals
5940 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5941 UseNUMAInterleaving = old_use_numa_interleaving;
5942 }
5943 #endif // PRODUCT