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, uint max) {
1900 _semaphore = ::CreateSemaphore(NULL, value, 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 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1913
1914 assert(ret != 0, err_msg("ReleaseSemaphore failed: %d", GetLastError()));
1915 }
1916
1917 void Semaphore::signal() {
1918 signal(1);
1919 }
1920
1921 void Semaphore::wait() {
1922 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1923 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed: %d", GetLastError()));
1924 }
1925
1926 // sun.misc.Signal
1927 // NOTE that this is a workaround for an apparent kernel bug where if
1928 // a signal handler for SIGBREAK is installed then that signal handler
1929 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1930 // See bug 4416763.
1931 static void (*sigbreakHandler)(int) = NULL;
1932
1933 static void UserHandler(int sig, void *siginfo, void *context) {
1934 os::signal_notify(sig);
1935 // We need to reinstate the signal handler each time...
1936 os::signal(sig, (void*)UserHandler);
1937 }
1938
1939 void* os::user_handler() {
1940 return (void*) UserHandler;
1941 }
1942
1943 void* os::signal(int signal_number, void* handler) {
1944 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1945 void (*oldHandler)(int) = sigbreakHandler;
1946 sigbreakHandler = (void (*)(int)) handler;
1947 return (void*) oldHandler;
1948 } else {
1949 return (void*)::signal(signal_number, (void (*)(int))handler);
1950 }
1951 }
1952
1953 void os::signal_raise(int signal_number) {
1954 raise(signal_number);
1955 }
1956
1957 // The Win32 C runtime library maps all console control events other than ^C
1958 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1959 // logoff, and shutdown events. We therefore install our own console handler
1960 // that raises SIGTERM for the latter cases.
1961 //
1962 static BOOL WINAPI consoleHandler(DWORD event) {
1963 switch (event) {
1964 case CTRL_C_EVENT:
1965 if (is_error_reported()) {
1966 // Ctrl-C is pressed during error reporting, likely because the error
1967 // handler fails to abort. Let VM die immediately.
1968 os::die();
1969 }
1970
1971 os::signal_raise(SIGINT);
1972 return TRUE;
1973 break;
1974 case CTRL_BREAK_EVENT:
1975 if (sigbreakHandler != NULL) {
1976 (*sigbreakHandler)(SIGBREAK);
1977 }
1978 return TRUE;
1979 break;
1980 case CTRL_LOGOFF_EVENT: {
1981 // Don't terminate JVM if it is running in a non-interactive session,
1982 // such as a service process.
1983 USEROBJECTFLAGS flags;
1984 HANDLE handle = GetProcessWindowStation();
1985 if (handle != NULL &&
1986 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1987 sizeof(USEROBJECTFLAGS), NULL)) {
1988 // If it is a non-interactive session, let next handler to deal
1989 // with it.
1990 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1991 return FALSE;
1992 }
1993 }
1994 }
1995 case CTRL_CLOSE_EVENT:
1996 case CTRL_SHUTDOWN_EVENT:
1997 os::signal_raise(SIGTERM);
1998 return TRUE;
1999 break;
2000 default:
2001 break;
2002 }
2003 return FALSE;
2004 }
2005
2006 // The following code is moved from os.cpp for making this
2007 // code platform specific, which it is by its very nature.
2008
2009 // Return maximum OS signal used + 1 for internal use only
2010 // Used as exit signal for signal_thread
2011 int os::sigexitnum_pd() {
2012 return NSIG;
2013 }
2014
2015 // a counter for each possible signal value, including signal_thread exit signal
2016 static volatile jint pending_signals[NSIG+1] = { 0 };
2017 static HANDLE sig_sem = NULL;
2018
2019 void os::signal_init_pd() {
2020 // Initialize signal structures
2021 memset((void*)pending_signals, 0, sizeof(pending_signals));
2022
2023 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2024
2025 // Programs embedding the VM do not want it to attempt to receive
2026 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2027 // shutdown hooks mechanism introduced in 1.3. For example, when
2028 // the VM is run as part of a Windows NT service (i.e., a servlet
2029 // engine in a web server), the correct behavior is for any console
2030 // control handler to return FALSE, not TRUE, because the OS's
2031 // "final" handler for such events allows the process to continue if
2032 // it is a service (while terminating it if it is not a service).
2033 // To make this behavior uniform and the mechanism simpler, we
2034 // completely disable the VM's usage of these console events if -Xrs
2035 // (=ReduceSignalUsage) is specified. This means, for example, that
2036 // the CTRL-BREAK thread dump mechanism is also disabled in this
2037 // case. See bugs 4323062, 4345157, and related bugs.
2038
2039 if (!ReduceSignalUsage) {
2040 // Add a CTRL-C handler
2041 SetConsoleCtrlHandler(consoleHandler, TRUE);
2042 }
2043 }
2044
2045 void os::signal_notify(int signal_number) {
2046 BOOL ret;
2047 if (sig_sem != NULL) {
2048 Atomic::inc(&pending_signals[signal_number]);
2049 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2050 assert(ret != 0, "ReleaseSemaphore() failed");
2051 }
2052 }
2053
2054 static int check_pending_signals(bool wait_for_signal) {
2055 DWORD ret;
2056 while (true) {
2057 for (int i = 0; i < NSIG + 1; i++) {
2058 jint n = pending_signals[i];
2059 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2060 return i;
2061 }
2062 }
2063 if (!wait_for_signal) {
2064 return -1;
2065 }
2066
2067 JavaThread *thread = JavaThread::current();
2068
2069 ThreadBlockInVM tbivm(thread);
2070
2071 bool threadIsSuspended;
2072 do {
2073 thread->set_suspend_equivalent();
2074 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2075 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2076 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2077
2078 // were we externally suspended while we were waiting?
2079 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2080 if (threadIsSuspended) {
2081 // The semaphore has been incremented, but while we were waiting
2082 // another thread suspended us. We don't want to continue running
2083 // while suspended because that would surprise the thread that
2084 // suspended us.
2085 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2086 assert(ret != 0, "ReleaseSemaphore() failed");
2087
2088 thread->java_suspend_self();
2089 }
2090 } while (threadIsSuspended);
2091 }
2092 }
2093
2094 int os::signal_lookup() {
2095 return check_pending_signals(false);
2096 }
2097
2098 int os::signal_wait() {
2099 return check_pending_signals(true);
2100 }
2101
2102 // Implicit OS exception handling
2103
2104 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2105 address handler) {
2106 JavaThread* thread = JavaThread::current();
2107 // Save pc in thread
2108 #ifdef _M_IA64
2109 // Do not blow up if no thread info available.
2110 if (thread) {
2111 // Saving PRECISE pc (with slot information) in thread.
2112 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2113 // Convert precise PC into "Unix" format
2114 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2115 thread->set_saved_exception_pc((address)precise_pc);
2116 }
2117 // Set pc to handler
2118 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2119 // Clear out psr.ri (= Restart Instruction) in order to continue
2120 // at the beginning of the target bundle.
2121 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2122 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2123 #else
2124 #ifdef _M_AMD64
2125 // Do not blow up if no thread info available.
2126 if (thread) {
2127 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2128 }
2129 // Set pc to handler
2130 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2131 #else
2132 // Do not blow up if no thread info available.
2133 if (thread) {
2134 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2135 }
2136 // Set pc to handler
2137 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2138 #endif
2139 #endif
2140
2141 // Continue the execution
2142 return EXCEPTION_CONTINUE_EXECUTION;
2143 }
2144
2145
2146 // Used for PostMortemDump
2147 extern "C" void safepoints();
2148 extern "C" void find(int x);
2149 extern "C" void events();
2150
2151 // According to Windows API documentation, an illegal instruction sequence should generate
2152 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2153 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2154 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2155
2156 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2157
2158 // From "Execution Protection in the Windows Operating System" draft 0.35
2159 // Once a system header becomes available, the "real" define should be
2160 // included or copied here.
2161 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2162
2163 // Handle NAT Bit consumption on IA64.
2164 #ifdef _M_IA64
2165 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2166 #endif
2167
2168 // Windows Vista/2008 heap corruption check
2169 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2170
2171 #define def_excpt(val) #val, val
2172
2173 struct siglabel {
2174 char *name;
2175 int number;
2176 };
2177
2178 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2179 // C++ compiler contain this error code. Because this is a compiler-generated
2180 // error, the code is not listed in the Win32 API header files.
2181 // The code is actually a cryptic mnemonic device, with the initial "E"
2182 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2183 // ASCII values of "msc".
2184
2185 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2186
2187
2188 struct siglabel exceptlabels[] = {
2189 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2190 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2191 def_excpt(EXCEPTION_BREAKPOINT),
2192 def_excpt(EXCEPTION_SINGLE_STEP),
2193 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2194 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2195 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2196 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2197 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2198 def_excpt(EXCEPTION_FLT_OVERFLOW),
2199 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2200 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2201 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2202 def_excpt(EXCEPTION_INT_OVERFLOW),
2203 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2204 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2205 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2206 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2207 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2208 def_excpt(EXCEPTION_STACK_OVERFLOW),
2209 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2210 def_excpt(EXCEPTION_GUARD_PAGE),
2211 def_excpt(EXCEPTION_INVALID_HANDLE),
2212 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2213 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2214 #ifdef _M_IA64
2215 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2216 #endif
2217 NULL, 0
2218 };
2219
2220 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2221 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2222 if (exceptlabels[i].number == exception_code) {
2223 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2224 return buf;
2225 }
2226 }
2227
2228 return NULL;
2229 }
2230
2231 //-----------------------------------------------------------------------------
2232 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2233 // handle exception caused by idiv; should only happen for -MinInt/-1
2234 // (division by zero is handled explicitly)
2235 #ifdef _M_IA64
2236 assert(0, "Fix Handle_IDiv_Exception");
2237 #else
2238 #ifdef _M_AMD64
2239 PCONTEXT ctx = exceptionInfo->ContextRecord;
2240 address pc = (address)ctx->Rip;
2241 assert(pc[0] == 0xF7, "not an idiv opcode");
2242 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2243 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2244 // set correct result values and continue after idiv instruction
2245 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2246 ctx->Rax = (DWORD)min_jint; // result
2247 ctx->Rdx = (DWORD)0; // remainder
2248 // Continue the execution
2249 #else
2250 PCONTEXT ctx = exceptionInfo->ContextRecord;
2251 address pc = (address)ctx->Eip;
2252 assert(pc[0] == 0xF7, "not an idiv opcode");
2253 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2254 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2255 // set correct result values and continue after idiv instruction
2256 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2257 ctx->Eax = (DWORD)min_jint; // result
2258 ctx->Edx = (DWORD)0; // remainder
2259 // Continue the execution
2260 #endif
2261 #endif
2262 return EXCEPTION_CONTINUE_EXECUTION;
2263 }
2264
2265 //-----------------------------------------------------------------------------
2266 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2267 PCONTEXT ctx = exceptionInfo->ContextRecord;
2268 #ifndef _WIN64
2269 // handle exception caused by native method modifying control word
2270 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2271
2272 switch (exception_code) {
2273 case EXCEPTION_FLT_DENORMAL_OPERAND:
2274 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2275 case EXCEPTION_FLT_INEXACT_RESULT:
2276 case EXCEPTION_FLT_INVALID_OPERATION:
2277 case EXCEPTION_FLT_OVERFLOW:
2278 case EXCEPTION_FLT_STACK_CHECK:
2279 case EXCEPTION_FLT_UNDERFLOW:
2280 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2281 if (fp_control_word != ctx->FloatSave.ControlWord) {
2282 // Restore FPCW and mask out FLT exceptions
2283 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2284 // Mask out pending FLT exceptions
2285 ctx->FloatSave.StatusWord &= 0xffffff00;
2286 return EXCEPTION_CONTINUE_EXECUTION;
2287 }
2288 }
2289
2290 if (prev_uef_handler != NULL) {
2291 // We didn't handle this exception so pass it to the previous
2292 // UnhandledExceptionFilter.
2293 return (prev_uef_handler)(exceptionInfo);
2294 }
2295 #else // !_WIN64
2296 // On Windows, the mxcsr control bits are non-volatile across calls
2297 // See also CR 6192333
2298 //
2299 jint MxCsr = INITIAL_MXCSR;
2300 // we can't use StubRoutines::addr_mxcsr_std()
2301 // because in Win64 mxcsr is not saved there
2302 if (MxCsr != ctx->MxCsr) {
2303 ctx->MxCsr = MxCsr;
2304 return EXCEPTION_CONTINUE_EXECUTION;
2305 }
2306 #endif // !_WIN64
2307
2308 return EXCEPTION_CONTINUE_SEARCH;
2309 }
2310
2311 static inline void report_error(Thread* t, DWORD exception_code,
2312 address addr, void* siginfo, void* context) {
2313 VMError err(t, exception_code, addr, siginfo, context);
2314 err.report_and_die();
2315
2316 // If UseOsErrorReporting, this will return here and save the error file
2317 // somewhere where we can find it in the minidump.
2318 }
2319
2320 //-----------------------------------------------------------------------------
2321 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2322 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2323 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2324 #ifdef _M_IA64
2325 // On Itanium, we need the "precise pc", which has the slot number coded
2326 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2327 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2328 // Convert the pc to "Unix format", which has the slot number coded
2329 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2330 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2331 // information is saved in the Unix format.
2332 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2333 #else
2334 #ifdef _M_AMD64
2335 address pc = (address) exceptionInfo->ContextRecord->Rip;
2336 #else
2337 address pc = (address) exceptionInfo->ContextRecord->Eip;
2338 #endif
2339 #endif
2340 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2341
2342 // Handle SafeFetch32 and SafeFetchN exceptions.
2343 if (StubRoutines::is_safefetch_fault(pc)) {
2344 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2345 }
2346
2347 #ifndef _WIN64
2348 // Execution protection violation - win32 running on AMD64 only
2349 // Handled first to avoid misdiagnosis as a "normal" access violation;
2350 // This is safe to do because we have a new/unique ExceptionInformation
2351 // code for this condition.
2352 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2353 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2354 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2355 address addr = (address) exceptionRecord->ExceptionInformation[1];
2356
2357 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2358 int page_size = os::vm_page_size();
2359
2360 // Make sure the pc and the faulting address are sane.
2361 //
2362 // If an instruction spans a page boundary, and the page containing
2363 // the beginning of the instruction is executable but the following
2364 // page is not, the pc and the faulting address might be slightly
2365 // different - we still want to unguard the 2nd page in this case.
2366 //
2367 // 15 bytes seems to be a (very) safe value for max instruction size.
2368 bool pc_is_near_addr =
2369 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2370 bool instr_spans_page_boundary =
2371 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2372 (intptr_t) page_size) > 0);
2373
2374 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2375 static volatile address last_addr =
2376 (address) os::non_memory_address_word();
2377
2378 // In conservative mode, don't unguard unless the address is in the VM
2379 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2380 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2381
2382 // Set memory to RWX and retry
2383 address page_start =
2384 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2385 bool res = os::protect_memory((char*) page_start, page_size,
2386 os::MEM_PROT_RWX);
2387
2388 if (PrintMiscellaneous && Verbose) {
2389 char buf[256];
2390 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2391 "at " INTPTR_FORMAT
2392 ", unguarding " INTPTR_FORMAT ": %s", addr,
2393 page_start, (res ? "success" : strerror(errno)));
2394 tty->print_raw_cr(buf);
2395 }
2396
2397 // Set last_addr so if we fault again at the same address, we don't
2398 // end up in an endless loop.
2399 //
2400 // There are two potential complications here. Two threads trapping
2401 // at the same address at the same time could cause one of the
2402 // threads to think it already unguarded, and abort the VM. Likely
2403 // very rare.
2404 //
2405 // The other race involves two threads alternately trapping at
2406 // different addresses and failing to unguard the page, resulting in
2407 // an endless loop. This condition is probably even more unlikely
2408 // than the first.
2409 //
2410 // Although both cases could be avoided by using locks or thread
2411 // local last_addr, these solutions are unnecessary complication:
2412 // this handler is a best-effort safety net, not a complete solution.
2413 // It is disabled by default and should only be used as a workaround
2414 // in case we missed any no-execute-unsafe VM code.
2415
2416 last_addr = addr;
2417
2418 return EXCEPTION_CONTINUE_EXECUTION;
2419 }
2420 }
2421
2422 // Last unguard failed or not unguarding
2423 tty->print_raw_cr("Execution protection violation");
2424 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2425 exceptionInfo->ContextRecord);
2426 return EXCEPTION_CONTINUE_SEARCH;
2427 }
2428 }
2429 #endif // _WIN64
2430
2431 // Check to see if we caught the safepoint code in the
2432 // process of write protecting the memory serialization page.
2433 // It write enables the page immediately after protecting it
2434 // so just return.
2435 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2436 JavaThread* thread = (JavaThread*) t;
2437 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2438 address addr = (address) exceptionRecord->ExceptionInformation[1];
2439 if (os::is_memory_serialize_page(thread, addr)) {
2440 // Block current thread until the memory serialize page permission restored.
2441 os::block_on_serialize_page_trap();
2442 return EXCEPTION_CONTINUE_EXECUTION;
2443 }
2444 }
2445
2446 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2447 VM_Version::is_cpuinfo_segv_addr(pc)) {
2448 // Verify that OS save/restore AVX registers.
2449 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2450 }
2451
2452 if (t != NULL && t->is_Java_thread()) {
2453 JavaThread* thread = (JavaThread*) t;
2454 bool in_java = thread->thread_state() == _thread_in_Java;
2455
2456 // Handle potential stack overflows up front.
2457 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2458 if (os::uses_stack_guard_pages()) {
2459 #ifdef _M_IA64
2460 // Use guard page for register stack.
2461 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2462 address addr = (address) exceptionRecord->ExceptionInformation[1];
2463 // Check for a register stack overflow on Itanium
2464 if (thread->addr_inside_register_stack_red_zone(addr)) {
2465 // Fatal red zone violation happens if the Java program
2466 // catches a StackOverflow error and does so much processing
2467 // that it runs beyond the unprotected yellow guard zone. As
2468 // a result, we are out of here.
2469 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2470 } else if(thread->addr_inside_register_stack(addr)) {
2471 // Disable the yellow zone which sets the state that
2472 // we've got a stack overflow problem.
2473 if (thread->stack_yellow_zone_enabled()) {
2474 thread->disable_stack_yellow_zone();
2475 }
2476 // Give us some room to process the exception.
2477 thread->disable_register_stack_guard();
2478 // Tracing with +Verbose.
2479 if (Verbose) {
2480 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2481 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2482 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2483 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2484 thread->register_stack_base(),
2485 thread->register_stack_base() + thread->stack_size());
2486 }
2487
2488 // Reguard the permanent register stack red zone just to be sure.
2489 // We saw Windows silently disabling this without telling us.
2490 thread->enable_register_stack_red_zone();
2491
2492 return Handle_Exception(exceptionInfo,
2493 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2494 }
2495 #endif
2496 if (thread->stack_yellow_zone_enabled()) {
2497 // Yellow zone violation. The o/s has unprotected the first yellow
2498 // zone page for us. Note: must call disable_stack_yellow_zone to
2499 // update the enabled status, even if the zone contains only one page.
2500 thread->disable_stack_yellow_zone();
2501 // If not in java code, return and hope for the best.
2502 return in_java
2503 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2504 : EXCEPTION_CONTINUE_EXECUTION;
2505 } else {
2506 // Fatal red zone violation.
2507 thread->disable_stack_red_zone();
2508 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2509 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2510 exceptionInfo->ContextRecord);
2511 return EXCEPTION_CONTINUE_SEARCH;
2512 }
2513 } else if (in_java) {
2514 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2515 // a one-time-only guard page, which it has released to us. The next
2516 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2517 return Handle_Exception(exceptionInfo,
2518 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2519 } else {
2520 // Can only return and hope for the best. Further stack growth will
2521 // result in an ACCESS_VIOLATION.
2522 return EXCEPTION_CONTINUE_EXECUTION;
2523 }
2524 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2525 // Either stack overflow or null pointer exception.
2526 if (in_java) {
2527 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2528 address addr = (address) exceptionRecord->ExceptionInformation[1];
2529 address stack_end = thread->stack_base() - thread->stack_size();
2530 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2531 // Stack overflow.
2532 assert(!os::uses_stack_guard_pages(),
2533 "should be caught by red zone code above.");
2534 return Handle_Exception(exceptionInfo,
2535 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2536 }
2537 // Check for safepoint polling and implicit null
2538 // We only expect null pointers in the stubs (vtable)
2539 // the rest are checked explicitly now.
2540 CodeBlob* cb = CodeCache::find_blob(pc);
2541 if (cb != NULL) {
2542 if (os::is_poll_address(addr)) {
2543 address stub = SharedRuntime::get_poll_stub(pc);
2544 return Handle_Exception(exceptionInfo, stub);
2545 }
2546 }
2547 {
2548 #ifdef _WIN64
2549 // If it's a legal stack address map the entire region in
2550 //
2551 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2552 address addr = (address) exceptionRecord->ExceptionInformation[1];
2553 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2554 addr = (address)((uintptr_t)addr &
2555 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2556 os::commit_memory((char *)addr, thread->stack_base() - addr,
2557 !ExecMem);
2558 return EXCEPTION_CONTINUE_EXECUTION;
2559 } else
2560 #endif
2561 {
2562 // Null pointer exception.
2563 #ifdef _M_IA64
2564 // Process implicit null checks in compiled code. Note: Implicit null checks
2565 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2566 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2567 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2568 // Handle implicit null check in UEP method entry
2569 if (cb && (cb->is_frame_complete_at(pc) ||
2570 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2571 if (Verbose) {
2572 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2573 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2574 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2575 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2576 *(bundle_start + 1), *bundle_start);
2577 }
2578 return Handle_Exception(exceptionInfo,
2579 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2580 }
2581 }
2582
2583 // Implicit null checks were processed above. Hence, we should not reach
2584 // here in the usual case => die!
2585 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2586 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2587 exceptionInfo->ContextRecord);
2588 return EXCEPTION_CONTINUE_SEARCH;
2589
2590 #else // !IA64
2591
2592 // Windows 98 reports faulting addresses incorrectly
2593 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2594 !os::win32::is_nt()) {
2595 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2596 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2597 }
2598 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2599 exceptionInfo->ContextRecord);
2600 return EXCEPTION_CONTINUE_SEARCH;
2601 #endif
2602 }
2603 }
2604 }
2605
2606 #ifdef _WIN64
2607 // Special care for fast JNI field accessors.
2608 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2609 // in and the heap gets shrunk before the field access.
2610 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2611 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2612 if (addr != (address)-1) {
2613 return Handle_Exception(exceptionInfo, addr);
2614 }
2615 }
2616 #endif
2617
2618 // Stack overflow or null pointer exception in native code.
2619 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2620 exceptionInfo->ContextRecord);
2621 return EXCEPTION_CONTINUE_SEARCH;
2622 } // /EXCEPTION_ACCESS_VIOLATION
2623 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2624 #if defined _M_IA64
2625 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2626 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2627 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2628
2629 // Compiled method patched to be non entrant? Following conditions must apply:
2630 // 1. must be first instruction in bundle
2631 // 2. must be a break instruction with appropriate code
2632 if ((((uint64_t) pc & 0x0F) == 0) &&
2633 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2634 return Handle_Exception(exceptionInfo,
2635 (address)SharedRuntime::get_handle_wrong_method_stub());
2636 }
2637 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2638 #endif
2639
2640
2641 if (in_java) {
2642 switch (exception_code) {
2643 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2644 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2645
2646 case EXCEPTION_INT_OVERFLOW:
2647 return Handle_IDiv_Exception(exceptionInfo);
2648
2649 } // switch
2650 }
2651 if (((thread->thread_state() == _thread_in_Java) ||
2652 (thread->thread_state() == _thread_in_native)) &&
2653 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2654 LONG result=Handle_FLT_Exception(exceptionInfo);
2655 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2656 }
2657 }
2658
2659 if (exception_code != EXCEPTION_BREAKPOINT) {
2660 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2661 exceptionInfo->ContextRecord);
2662 }
2663 return EXCEPTION_CONTINUE_SEARCH;
2664 }
2665
2666 #ifndef _WIN64
2667 // Special care for fast JNI accessors.
2668 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2669 // the heap gets shrunk before the field access.
2670 // Need to install our own structured exception handler since native code may
2671 // install its own.
2672 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2673 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2674 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2675 address pc = (address) exceptionInfo->ContextRecord->Eip;
2676 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2677 if (addr != (address)-1) {
2678 return Handle_Exception(exceptionInfo, addr);
2679 }
2680 }
2681 return EXCEPTION_CONTINUE_SEARCH;
2682 }
2683
2684 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2685 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2686 jobject obj, \
2687 jfieldID fieldID) { \
2688 __try { \
2689 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2690 obj, \
2691 fieldID); \
2692 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2693 _exception_info())) { \
2694 } \
2695 return 0; \
2696 }
2697
2698 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2699 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2700 DEFINE_FAST_GETFIELD(jchar, char, Char)
2701 DEFINE_FAST_GETFIELD(jshort, short, Short)
2702 DEFINE_FAST_GETFIELD(jint, int, Int)
2703 DEFINE_FAST_GETFIELD(jlong, long, Long)
2704 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2705 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2706
2707 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2708 switch (type) {
2709 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2710 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2711 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2712 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2713 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2714 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2715 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2716 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2717 default: ShouldNotReachHere();
2718 }
2719 return (address)-1;
2720 }
2721 #endif
2722
2723 // Virtual Memory
2724
2725 int os::vm_page_size() { return os::win32::vm_page_size(); }
2726 int os::vm_allocation_granularity() {
2727 return os::win32::vm_allocation_granularity();
2728 }
2729
2730 // Windows large page support is available on Windows 2003. In order to use
2731 // large page memory, the administrator must first assign additional privilege
2732 // to the user:
2733 // + select Control Panel -> Administrative Tools -> Local Security Policy
2734 // + select Local Policies -> User Rights Assignment
2735 // + double click "Lock pages in memory", add users and/or groups
2736 // + reboot
2737 // Note the above steps are needed for administrator as well, as administrators
2738 // by default do not have the privilege to lock pages in memory.
2739 //
2740 // Note about Windows 2003: although the API supports committing large page
2741 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2742 // scenario, I found through experiment it only uses large page if the entire
2743 // memory region is reserved and committed in a single VirtualAlloc() call.
2744 // This makes Windows large page support more or less like Solaris ISM, in
2745 // that the entire heap must be committed upfront. This probably will change
2746 // in the future, if so the code below needs to be revisited.
2747
2748 #ifndef MEM_LARGE_PAGES
2749 #define MEM_LARGE_PAGES 0x20000000
2750 #endif
2751
2752 static HANDLE _hProcess;
2753 static HANDLE _hToken;
2754
2755 // Container for NUMA node list info
2756 class NUMANodeListHolder {
2757 private:
2758 int *_numa_used_node_list; // allocated below
2759 int _numa_used_node_count;
2760
2761 void free_node_list() {
2762 if (_numa_used_node_list != NULL) {
2763 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2764 }
2765 }
2766
2767 public:
2768 NUMANodeListHolder() {
2769 _numa_used_node_count = 0;
2770 _numa_used_node_list = NULL;
2771 // do rest of initialization in build routine (after function pointers are set up)
2772 }
2773
2774 ~NUMANodeListHolder() {
2775 free_node_list();
2776 }
2777
2778 bool build() {
2779 DWORD_PTR proc_aff_mask;
2780 DWORD_PTR sys_aff_mask;
2781 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2782 ULONG highest_node_number;
2783 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2784 free_node_list();
2785 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2786 for (unsigned int i = 0; i <= highest_node_number; i++) {
2787 ULONGLONG proc_mask_numa_node;
2788 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2789 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2790 _numa_used_node_list[_numa_used_node_count++] = i;
2791 }
2792 }
2793 return (_numa_used_node_count > 1);
2794 }
2795
2796 int get_count() { return _numa_used_node_count; }
2797 int get_node_list_entry(int n) {
2798 // for indexes out of range, returns -1
2799 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2800 }
2801
2802 } numa_node_list_holder;
2803
2804
2805
2806 static size_t _large_page_size = 0;
2807
2808 static bool resolve_functions_for_large_page_init() {
2809 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2810 os::Advapi32Dll::AdvapiAvailable();
2811 }
2812
2813 static bool request_lock_memory_privilege() {
2814 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2815 os::current_process_id());
2816
2817 LUID luid;
2818 if (_hProcess != NULL &&
2819 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2820 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2821
2822 TOKEN_PRIVILEGES tp;
2823 tp.PrivilegeCount = 1;
2824 tp.Privileges[0].Luid = luid;
2825 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2826
2827 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2828 // privilege. Check GetLastError() too. See MSDN document.
2829 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2830 (GetLastError() == ERROR_SUCCESS)) {
2831 return true;
2832 }
2833 }
2834
2835 return false;
2836 }
2837
2838 static void cleanup_after_large_page_init() {
2839 if (_hProcess) CloseHandle(_hProcess);
2840 _hProcess = NULL;
2841 if (_hToken) CloseHandle(_hToken);
2842 _hToken = NULL;
2843 }
2844
2845 static bool numa_interleaving_init() {
2846 bool success = false;
2847 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2848
2849 // print a warning if UseNUMAInterleaving flag is specified on command line
2850 bool warn_on_failure = use_numa_interleaving_specified;
2851 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2852
2853 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2854 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2855 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2856
2857 if (os::Kernel32Dll::NumaCallsAvailable()) {
2858 if (numa_node_list_holder.build()) {
2859 if (PrintMiscellaneous && Verbose) {
2860 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2861 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2862 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2863 }
2864 tty->print("\n");
2865 }
2866 success = true;
2867 } else {
2868 WARN("Process does not cover multiple NUMA nodes.");
2869 }
2870 } else {
2871 WARN("NUMA Interleaving is not supported by the operating system.");
2872 }
2873 if (!success) {
2874 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2875 }
2876 return success;
2877 #undef WARN
2878 }
2879
2880 // this routine is used whenever we need to reserve a contiguous VA range
2881 // but we need to make separate VirtualAlloc calls for each piece of the range
2882 // Reasons for doing this:
2883 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2884 // * UseNUMAInterleaving requires a separate node for each piece
2885 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2886 DWORD prot,
2887 bool should_inject_error = false) {
2888 char * p_buf;
2889 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2890 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2891 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2892
2893 // first reserve enough address space in advance since we want to be
2894 // able to break a single contiguous virtual address range into multiple
2895 // large page commits but WS2003 does not allow reserving large page space
2896 // so we just use 4K pages for reserve, this gives us a legal contiguous
2897 // address space. then we will deallocate that reservation, and re alloc
2898 // using large pages
2899 const size_t size_of_reserve = bytes + chunk_size;
2900 if (bytes > size_of_reserve) {
2901 // Overflowed.
2902 return NULL;
2903 }
2904 p_buf = (char *) VirtualAlloc(addr,
2905 size_of_reserve, // size of Reserve
2906 MEM_RESERVE,
2907 PAGE_READWRITE);
2908 // If reservation failed, return NULL
2909 if (p_buf == NULL) return NULL;
2910 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2911 os::release_memory(p_buf, bytes + chunk_size);
2912
2913 // we still need to round up to a page boundary (in case we are using large pages)
2914 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2915 // instead we handle this in the bytes_to_rq computation below
2916 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2917
2918 // now go through and allocate one chunk at a time until all bytes are
2919 // allocated
2920 size_t bytes_remaining = bytes;
2921 // An overflow of align_size_up() would have been caught above
2922 // in the calculation of size_of_reserve.
2923 char * next_alloc_addr = p_buf;
2924 HANDLE hProc = GetCurrentProcess();
2925
2926 #ifdef ASSERT
2927 // Variable for the failure injection
2928 long ran_num = os::random();
2929 size_t fail_after = ran_num % bytes;
2930 #endif
2931
2932 int count=0;
2933 while (bytes_remaining) {
2934 // select bytes_to_rq to get to the next chunk_size boundary
2935
2936 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2937 // Note allocate and commit
2938 char * p_new;
2939
2940 #ifdef ASSERT
2941 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2942 #else
2943 const bool inject_error_now = false;
2944 #endif
2945
2946 if (inject_error_now) {
2947 p_new = NULL;
2948 } else {
2949 if (!UseNUMAInterleaving) {
2950 p_new = (char *) VirtualAlloc(next_alloc_addr,
2951 bytes_to_rq,
2952 flags,
2953 prot);
2954 } else {
2955 // get the next node to use from the used_node_list
2956 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2957 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2958 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2959 next_alloc_addr,
2960 bytes_to_rq,
2961 flags,
2962 prot,
2963 node);
2964 }
2965 }
2966
2967 if (p_new == NULL) {
2968 // Free any allocated pages
2969 if (next_alloc_addr > p_buf) {
2970 // Some memory was committed so release it.
2971 size_t bytes_to_release = bytes - bytes_remaining;
2972 // NMT has yet to record any individual blocks, so it
2973 // need to create a dummy 'reserve' record to match
2974 // the release.
2975 MemTracker::record_virtual_memory_reserve((address)p_buf,
2976 bytes_to_release, CALLER_PC);
2977 os::release_memory(p_buf, bytes_to_release);
2978 }
2979 #ifdef ASSERT
2980 if (should_inject_error) {
2981 if (TracePageSizes && Verbose) {
2982 tty->print_cr("Reserving pages individually failed.");
2983 }
2984 }
2985 #endif
2986 return NULL;
2987 }
2988
2989 bytes_remaining -= bytes_to_rq;
2990 next_alloc_addr += bytes_to_rq;
2991 count++;
2992 }
2993 // Although the memory is allocated individually, it is returned as one.
2994 // NMT records it as one block.
2995 if ((flags & MEM_COMMIT) != 0) {
2996 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2997 } else {
2998 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2999 }
3000
3001 // made it this far, success
3002 return p_buf;
3003 }
3004
3005
3006
3007 void os::large_page_init() {
3008 if (!UseLargePages) return;
3009
3010 // print a warning if any large page related flag is specified on command line
3011 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3012 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3013 bool success = false;
3014
3015 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3016 if (resolve_functions_for_large_page_init()) {
3017 if (request_lock_memory_privilege()) {
3018 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3019 if (s) {
3020 #if defined(IA32) || defined(AMD64)
3021 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3022 WARN("JVM cannot use large pages bigger than 4mb.");
3023 } else {
3024 #endif
3025 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3026 _large_page_size = LargePageSizeInBytes;
3027 } else {
3028 _large_page_size = s;
3029 }
3030 success = true;
3031 #if defined(IA32) || defined(AMD64)
3032 }
3033 #endif
3034 } else {
3035 WARN("Large page is not supported by the processor.");
3036 }
3037 } else {
3038 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3039 }
3040 } else {
3041 WARN("Large page is not supported by the operating system.");
3042 }
3043 #undef WARN
3044
3045 const size_t default_page_size = (size_t) vm_page_size();
3046 if (success && _large_page_size > default_page_size) {
3047 _page_sizes[0] = _large_page_size;
3048 _page_sizes[1] = default_page_size;
3049 _page_sizes[2] = 0;
3050 }
3051
3052 cleanup_after_large_page_init();
3053 UseLargePages = success;
3054 }
3055
3056 // On win32, one cannot release just a part of reserved memory, it's an
3057 // all or nothing deal. When we split a reservation, we must break the
3058 // reservation into two reservations.
3059 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3060 bool realloc) {
3061 if (size > 0) {
3062 release_memory(base, size);
3063 if (realloc) {
3064 reserve_memory(split, base);
3065 }
3066 if (size != split) {
3067 reserve_memory(size - split, base + split);
3068 }
3069 }
3070 }
3071
3072 // Multiple threads can race in this code but it's not possible to unmap small sections of
3073 // virtual space to get requested alignment, like posix-like os's.
3074 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3075 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3076 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3077 "Alignment must be a multiple of allocation granularity (page size)");
3078 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3079
3080 size_t extra_size = size + alignment;
3081 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3082
3083 char* aligned_base = NULL;
3084
3085 do {
3086 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3087 if (extra_base == NULL) {
3088 return NULL;
3089 }
3090 // Do manual alignment
3091 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3092
3093 os::release_memory(extra_base, extra_size);
3094
3095 aligned_base = os::reserve_memory(size, aligned_base);
3096
3097 } while (aligned_base == NULL);
3098
3099 return aligned_base;
3100 }
3101
3102 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3103 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3104 "reserve alignment");
3105 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3106 char* res;
3107 // note that if UseLargePages is on, all the areas that require interleaving
3108 // will go thru reserve_memory_special rather than thru here.
3109 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3110 if (!use_individual) {
3111 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3112 } else {
3113 elapsedTimer reserveTimer;
3114 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3115 // in numa interleaving, we have to allocate pages individually
3116 // (well really chunks of NUMAInterleaveGranularity size)
3117 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3118 if (res == NULL) {
3119 warning("NUMA page allocation failed");
3120 }
3121 if (Verbose && PrintMiscellaneous) {
3122 reserveTimer.stop();
3123 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3124 reserveTimer.milliseconds(), reserveTimer.ticks());
3125 }
3126 }
3127 assert(res == NULL || addr == NULL || addr == res,
3128 "Unexpected address from reserve.");
3129
3130 return res;
3131 }
3132
3133 // Reserve memory at an arbitrary address, only if that area is
3134 // available (and not reserved for something else).
3135 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3136 // Windows os::reserve_memory() fails of the requested address range is
3137 // not avilable.
3138 return reserve_memory(bytes, requested_addr);
3139 }
3140
3141 size_t os::large_page_size() {
3142 return _large_page_size;
3143 }
3144
3145 bool os::can_commit_large_page_memory() {
3146 // Windows only uses large page memory when the entire region is reserved
3147 // and committed in a single VirtualAlloc() call. This may change in the
3148 // future, but with Windows 2003 it's not possible to commit on demand.
3149 return false;
3150 }
3151
3152 bool os::can_execute_large_page_memory() {
3153 return true;
3154 }
3155
3156 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3157 bool exec) {
3158 assert(UseLargePages, "only for large pages");
3159
3160 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3161 return NULL; // Fallback to small pages.
3162 }
3163
3164 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3165 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3166
3167 // with large pages, there are two cases where we need to use Individual Allocation
3168 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3169 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3170 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3171 if (TracePageSizes && Verbose) {
3172 tty->print_cr("Reserving large pages individually.");
3173 }
3174 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3175 if (p_buf == NULL) {
3176 // give an appropriate warning message
3177 if (UseNUMAInterleaving) {
3178 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3179 }
3180 if (UseLargePagesIndividualAllocation) {
3181 warning("Individually allocated large pages failed, "
3182 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3183 }
3184 return NULL;
3185 }
3186
3187 return p_buf;
3188
3189 } else {
3190 if (TracePageSizes && Verbose) {
3191 tty->print_cr("Reserving large pages in a single large chunk.");
3192 }
3193 // normal policy just allocate it all at once
3194 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3195 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3196 if (res != NULL) {
3197 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3198 }
3199
3200 return res;
3201 }
3202 }
3203
3204 bool os::release_memory_special(char* base, size_t bytes) {
3205 assert(base != NULL, "Sanity check");
3206 return release_memory(base, bytes);
3207 }
3208
3209 void os::print_statistics() {
3210 }
3211
3212 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3213 int err = os::get_last_error();
3214 char buf[256];
3215 size_t buf_len = os::lasterror(buf, sizeof(buf));
3216 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3217 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3218 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3219 }
3220
3221 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3222 if (bytes == 0) {
3223 // Don't bother the OS with noops.
3224 return true;
3225 }
3226 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3227 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3228 // Don't attempt to print anything if the OS call fails. We're
3229 // probably low on resources, so the print itself may cause crashes.
3230
3231 // unless we have NUMAInterleaving enabled, the range of a commit
3232 // is always within a reserve covered by a single VirtualAlloc
3233 // in that case we can just do a single commit for the requested size
3234 if (!UseNUMAInterleaving) {
3235 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3236 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3237 return false;
3238 }
3239 if (exec) {
3240 DWORD oldprot;
3241 // Windows doc says to use VirtualProtect to get execute permissions
3242 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3243 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3244 return false;
3245 }
3246 }
3247 return true;
3248 } else {
3249
3250 // when NUMAInterleaving is enabled, the commit might cover a range that
3251 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3252 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3253 // returns represents the number of bytes that can be committed in one step.
3254 size_t bytes_remaining = bytes;
3255 char * next_alloc_addr = addr;
3256 while (bytes_remaining > 0) {
3257 MEMORY_BASIC_INFORMATION alloc_info;
3258 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3259 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3260 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3261 PAGE_READWRITE) == NULL) {
3262 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3263 exec);)
3264 return false;
3265 }
3266 if (exec) {
3267 DWORD oldprot;
3268 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3269 PAGE_EXECUTE_READWRITE, &oldprot)) {
3270 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3271 exec);)
3272 return false;
3273 }
3274 }
3275 bytes_remaining -= bytes_to_rq;
3276 next_alloc_addr += bytes_to_rq;
3277 }
3278 }
3279 // if we made it this far, return true
3280 return true;
3281 }
3282
3283 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3284 bool exec) {
3285 // alignment_hint is ignored on this OS
3286 return pd_commit_memory(addr, size, exec);
3287 }
3288
3289 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3290 const char* mesg) {
3291 assert(mesg != NULL, "mesg must be specified");
3292 if (!pd_commit_memory(addr, size, exec)) {
3293 warn_fail_commit_memory(addr, size, exec);
3294 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3295 }
3296 }
3297
3298 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3299 size_t alignment_hint, bool exec,
3300 const char* mesg) {
3301 // alignment_hint is ignored on this OS
3302 pd_commit_memory_or_exit(addr, size, exec, mesg);
3303 }
3304
3305 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3306 if (bytes == 0) {
3307 // Don't bother the OS with noops.
3308 return true;
3309 }
3310 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3311 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3312 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3313 }
3314
3315 bool os::pd_release_memory(char* addr, size_t bytes) {
3316 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3317 }
3318
3319 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3320 return os::commit_memory(addr, size, !ExecMem);
3321 }
3322
3323 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3324 return os::uncommit_memory(addr, size);
3325 }
3326
3327 // Set protections specified
3328 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3329 bool is_committed) {
3330 unsigned int p = 0;
3331 switch (prot) {
3332 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3333 case MEM_PROT_READ: p = PAGE_READONLY; break;
3334 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3335 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3336 default:
3337 ShouldNotReachHere();
3338 }
3339
3340 DWORD old_status;
3341
3342 // Strange enough, but on Win32 one can change protection only for committed
3343 // memory, not a big deal anyway, as bytes less or equal than 64K
3344 if (!is_committed) {
3345 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3346 "cannot commit protection page");
3347 }
3348 // One cannot use os::guard_memory() here, as on Win32 guard page
3349 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3350 //
3351 // Pages in the region become guard pages. Any attempt to access a guard page
3352 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3353 // the guard page status. Guard pages thus act as a one-time access alarm.
3354 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3355 }
3356
3357 bool os::guard_memory(char* addr, size_t bytes) {
3358 DWORD old_status;
3359 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3360 }
3361
3362 bool os::unguard_memory(char* addr, size_t bytes) {
3363 DWORD old_status;
3364 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3365 }
3366
3367 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3368 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3369 void os::numa_make_global(char *addr, size_t bytes) { }
3370 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3371 bool os::numa_topology_changed() { return false; }
3372 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3373 int os::numa_get_group_id() { return 0; }
3374 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3375 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3376 // Provide an answer for UMA systems
3377 ids[0] = 0;
3378 return 1;
3379 } else {
3380 // check for size bigger than actual groups_num
3381 size = MIN2(size, numa_get_groups_num());
3382 for (int i = 0; i < (int)size; i++) {
3383 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3384 }
3385 return size;
3386 }
3387 }
3388
3389 bool os::get_page_info(char *start, page_info* info) {
3390 return false;
3391 }
3392
3393 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3394 page_info* page_found) {
3395 return end;
3396 }
3397
3398 char* os::non_memory_address_word() {
3399 // Must never look like an address returned by reserve_memory,
3400 // even in its subfields (as defined by the CPU immediate fields,
3401 // if the CPU splits constants across multiple instructions).
3402 return (char*)-1;
3403 }
3404
3405 #define MAX_ERROR_COUNT 100
3406 #define SYS_THREAD_ERROR 0xffffffffUL
3407
3408 void os::pd_start_thread(Thread* thread) {
3409 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3410 // Returns previous suspend state:
3411 // 0: Thread was not suspended
3412 // 1: Thread is running now
3413 // >1: Thread is still suspended.
3414 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3415 }
3416
3417 class HighResolutionInterval : public CHeapObj<mtThread> {
3418 // The default timer resolution seems to be 10 milliseconds.
3419 // (Where is this written down?)
3420 // If someone wants to sleep for only a fraction of the default,
3421 // then we set the timer resolution down to 1 millisecond for
3422 // the duration of their interval.
3423 // We carefully set the resolution back, since otherwise we
3424 // seem to incur an overhead (3%?) that we don't need.
3425 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3426 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3427 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3428 // timeBeginPeriod() if the relative error exceeded some threshold.
3429 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3430 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3431 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3432 // resolution timers running.
3433 private:
3434 jlong resolution;
3435 public:
3436 HighResolutionInterval(jlong ms) {
3437 resolution = ms % 10L;
3438 if (resolution != 0) {
3439 MMRESULT result = timeBeginPeriod(1L);
3440 }
3441 }
3442 ~HighResolutionInterval() {
3443 if (resolution != 0) {
3444 MMRESULT result = timeEndPeriod(1L);
3445 }
3446 resolution = 0L;
3447 }
3448 };
3449
3450 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3451 jlong limit = (jlong) MAXDWORD;
3452
3453 while (ms > limit) {
3454 int res;
3455 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3456 return res;
3457 }
3458 ms -= limit;
3459 }
3460
3461 assert(thread == Thread::current(), "thread consistency check");
3462 OSThread* osthread = thread->osthread();
3463 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3464 int result;
3465 if (interruptable) {
3466 assert(thread->is_Java_thread(), "must be java thread");
3467 JavaThread *jt = (JavaThread *) thread;
3468 ThreadBlockInVM tbivm(jt);
3469
3470 jt->set_suspend_equivalent();
3471 // cleared by handle_special_suspend_equivalent_condition() or
3472 // java_suspend_self() via check_and_wait_while_suspended()
3473
3474 HANDLE events[1];
3475 events[0] = osthread->interrupt_event();
3476 HighResolutionInterval *phri=NULL;
3477 if (!ForceTimeHighResolution) {
3478 phri = new HighResolutionInterval(ms);
3479 }
3480 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3481 result = OS_TIMEOUT;
3482 } else {
3483 ResetEvent(osthread->interrupt_event());
3484 osthread->set_interrupted(false);
3485 result = OS_INTRPT;
3486 }
3487 delete phri; //if it is NULL, harmless
3488
3489 // were we externally suspended while we were waiting?
3490 jt->check_and_wait_while_suspended();
3491 } else {
3492 assert(!thread->is_Java_thread(), "must not be java thread");
3493 Sleep((long) ms);
3494 result = OS_TIMEOUT;
3495 }
3496 return result;
3497 }
3498
3499 // Short sleep, direct OS call.
3500 //
3501 // ms = 0, means allow others (if any) to run.
3502 //
3503 void os::naked_short_sleep(jlong ms) {
3504 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3505 Sleep(ms);
3506 }
3507
3508 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3509 void os::infinite_sleep() {
3510 while (true) { // sleep forever ...
3511 Sleep(100000); // ... 100 seconds at a time
3512 }
3513 }
3514
3515 typedef BOOL (WINAPI * STTSignature)(void);
3516
3517 void os::naked_yield() {
3518 // Use either SwitchToThread() or Sleep(0)
3519 // Consider passing back the return value from SwitchToThread().
3520 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3521 SwitchToThread();
3522 } else {
3523 Sleep(0);
3524 }
3525 }
3526
3527 // Win32 only gives you access to seven real priorities at a time,
3528 // so we compress Java's ten down to seven. It would be better
3529 // if we dynamically adjusted relative priorities.
3530
3531 int os::java_to_os_priority[CriticalPriority + 1] = {
3532 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3533 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3534 THREAD_PRIORITY_LOWEST, // 2
3535 THREAD_PRIORITY_BELOW_NORMAL, // 3
3536 THREAD_PRIORITY_BELOW_NORMAL, // 4
3537 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3538 THREAD_PRIORITY_NORMAL, // 6
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3540 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3541 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3542 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3543 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3544 };
3545
3546 int prio_policy1[CriticalPriority + 1] = {
3547 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3548 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3549 THREAD_PRIORITY_LOWEST, // 2
3550 THREAD_PRIORITY_BELOW_NORMAL, // 3
3551 THREAD_PRIORITY_BELOW_NORMAL, // 4
3552 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3553 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3554 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3555 THREAD_PRIORITY_HIGHEST, // 8
3556 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3557 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3558 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3559 };
3560
3561 static int prio_init() {
3562 // If ThreadPriorityPolicy is 1, switch tables
3563 if (ThreadPriorityPolicy == 1) {
3564 int i;
3565 for (i = 0; i < CriticalPriority + 1; i++) {
3566 os::java_to_os_priority[i] = prio_policy1[i];
3567 }
3568 }
3569 if (UseCriticalJavaThreadPriority) {
3570 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3571 }
3572 return 0;
3573 }
3574
3575 OSReturn os::set_native_priority(Thread* thread, int priority) {
3576 if (!UseThreadPriorities) return OS_OK;
3577 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3578 return ret ? OS_OK : OS_ERR;
3579 }
3580
3581 OSReturn os::get_native_priority(const Thread* const thread,
3582 int* priority_ptr) {
3583 if (!UseThreadPriorities) {
3584 *priority_ptr = java_to_os_priority[NormPriority];
3585 return OS_OK;
3586 }
3587 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3588 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3589 assert(false, "GetThreadPriority failed");
3590 return OS_ERR;
3591 }
3592 *priority_ptr = os_prio;
3593 return OS_OK;
3594 }
3595
3596
3597 // Hint to the underlying OS that a task switch would not be good.
3598 // Void return because it's a hint and can fail.
3599 void os::hint_no_preempt() {}
3600
3601 void os::interrupt(Thread* thread) {
3602 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3603 Threads_lock->owned_by_self(),
3604 "possibility of dangling Thread pointer");
3605
3606 OSThread* osthread = thread->osthread();
3607 osthread->set_interrupted(true);
3608 // More than one thread can get here with the same value of osthread,
3609 // resulting in multiple notifications. We do, however, want the store
3610 // to interrupted() to be visible to other threads before we post
3611 // the interrupt event.
3612 OrderAccess::release();
3613 SetEvent(osthread->interrupt_event());
3614 // For JSR166: unpark after setting status
3615 if (thread->is_Java_thread()) {
3616 ((JavaThread*)thread)->parker()->unpark();
3617 }
3618
3619 ParkEvent * ev = thread->_ParkEvent;
3620 if (ev != NULL) ev->unpark();
3621 }
3622
3623
3624 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3625 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3626 "possibility of dangling Thread pointer");
3627
3628 OSThread* osthread = thread->osthread();
3629 // There is no synchronization between the setting of the interrupt
3630 // and it being cleared here. It is critical - see 6535709 - that
3631 // we only clear the interrupt state, and reset the interrupt event,
3632 // if we are going to report that we were indeed interrupted - else
3633 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3634 // depending on the timing. By checking thread interrupt event to see
3635 // if the thread gets real interrupt thus prevent spurious wakeup.
3636 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3637 if (interrupted && clear_interrupted) {
3638 osthread->set_interrupted(false);
3639 ResetEvent(osthread->interrupt_event());
3640 } // Otherwise leave the interrupted state alone
3641
3642 return interrupted;
3643 }
3644
3645 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3646 ExtendedPC os::get_thread_pc(Thread* thread) {
3647 CONTEXT context;
3648 context.ContextFlags = CONTEXT_CONTROL;
3649 HANDLE handle = thread->osthread()->thread_handle();
3650 #ifdef _M_IA64
3651 assert(0, "Fix get_thread_pc");
3652 return ExtendedPC(NULL);
3653 #else
3654 if (GetThreadContext(handle, &context)) {
3655 #ifdef _M_AMD64
3656 return ExtendedPC((address) context.Rip);
3657 #else
3658 return ExtendedPC((address) context.Eip);
3659 #endif
3660 } else {
3661 return ExtendedPC(NULL);
3662 }
3663 #endif
3664 }
3665
3666 // GetCurrentThreadId() returns DWORD
3667 intx os::current_thread_id() { return GetCurrentThreadId(); }
3668
3669 static int _initial_pid = 0;
3670
3671 int os::current_process_id() {
3672 return (_initial_pid ? _initial_pid : _getpid());
3673 }
3674
3675 int os::win32::_vm_page_size = 0;
3676 int os::win32::_vm_allocation_granularity = 0;
3677 int os::win32::_processor_type = 0;
3678 // Processor level is not available on non-NT systems, use vm_version instead
3679 int os::win32::_processor_level = 0;
3680 julong os::win32::_physical_memory = 0;
3681 size_t os::win32::_default_stack_size = 0;
3682
3683 intx os::win32::_os_thread_limit = 0;
3684 volatile intx os::win32::_os_thread_count = 0;
3685
3686 bool os::win32::_is_nt = false;
3687 bool os::win32::_is_windows_2003 = false;
3688 bool os::win32::_is_windows_server = false;
3689
3690 // 6573254
3691 // Currently, the bug is observed across all the supported Windows releases,
3692 // including the latest one (as of this writing - Windows Server 2012 R2)
3693 bool os::win32::_has_exit_bug = true;
3694 bool os::win32::_has_performance_count = 0;
3695
3696 void os::win32::initialize_system_info() {
3697 SYSTEM_INFO si;
3698 GetSystemInfo(&si);
3699 _vm_page_size = si.dwPageSize;
3700 _vm_allocation_granularity = si.dwAllocationGranularity;
3701 _processor_type = si.dwProcessorType;
3702 _processor_level = si.wProcessorLevel;
3703 set_processor_count(si.dwNumberOfProcessors);
3704
3705 MEMORYSTATUSEX ms;
3706 ms.dwLength = sizeof(ms);
3707
3708 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3709 // dwMemoryLoad (% of memory in use)
3710 GlobalMemoryStatusEx(&ms);
3711 _physical_memory = ms.ullTotalPhys;
3712
3713 OSVERSIONINFOEX oi;
3714 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3715 GetVersionEx((OSVERSIONINFO*)&oi);
3716 switch (oi.dwPlatformId) {
3717 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3718 case VER_PLATFORM_WIN32_NT:
3719 _is_nt = true;
3720 {
3721 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3722 if (os_vers == 5002) {
3723 _is_windows_2003 = true;
3724 }
3725 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3726 oi.wProductType == VER_NT_SERVER) {
3727 _is_windows_server = true;
3728 }
3729 }
3730 break;
3731 default: fatal("Unknown platform");
3732 }
3733
3734 _default_stack_size = os::current_stack_size();
3735 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3736 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3737 "stack size not a multiple of page size");
3738
3739 initialize_performance_counter();
3740
3741 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3742 // known to deadlock the system, if the VM issues to thread operations with
3743 // a too high frequency, e.g., such as changing the priorities.
3744 // The 6000 seems to work well - no deadlocks has been notices on the test
3745 // programs that we have seen experience this problem.
3746 if (!os::win32::is_nt()) {
3747 StarvationMonitorInterval = 6000;
3748 }
3749 }
3750
3751
3752 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3753 int ebuflen) {
3754 char path[MAX_PATH];
3755 DWORD size;
3756 DWORD pathLen = (DWORD)sizeof(path);
3757 HINSTANCE result = NULL;
3758
3759 // only allow library name without path component
3760 assert(strchr(name, '\\') == NULL, "path not allowed");
3761 assert(strchr(name, ':') == NULL, "path not allowed");
3762 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3763 jio_snprintf(ebuf, ebuflen,
3764 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3765 return NULL;
3766 }
3767
3768 // search system directory
3769 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3770 if (size >= pathLen) {
3771 return NULL; // truncated
3772 }
3773 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3774 return NULL; // truncated
3775 }
3776 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3777 return result;
3778 }
3779 }
3780
3781 // try Windows directory
3782 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3783 if (size >= pathLen) {
3784 return NULL; // truncated
3785 }
3786 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3787 return NULL; // truncated
3788 }
3789 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3790 return result;
3791 }
3792 }
3793
3794 jio_snprintf(ebuf, ebuflen,
3795 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3796 return NULL;
3797 }
3798
3799 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3800
3801 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3802 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3803 return TRUE;
3804 }
3805
3806 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3807 // Basic approach:
3808 // - Each exiting thread registers its intent to exit and then does so.
3809 // - A thread trying to terminate the process must wait for all
3810 // threads currently exiting to complete their exit.
3811
3812 if (os::win32::has_exit_bug()) {
3813 // The array holds handles of the threads that have started exiting by calling
3814 // _endthreadex().
3815 // Should be large enough to avoid blocking the exiting thread due to lack of
3816 // a free slot.
3817 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3818 static int handle_count = 0;
3819
3820 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3821 static CRITICAL_SECTION crit_sect;
3822 static volatile jint process_exiting = 0;
3823 int i, j;
3824 DWORD res;
3825 HANDLE hproc, hthr;
3826
3827 // The first thread that reached this point, initializes the critical section.
3828 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3829 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3830 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3831 EnterCriticalSection(&crit_sect);
3832
3833 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3834 // Remove from the array those handles of the threads that have completed exiting.
3835 for (i = 0, j = 0; i < handle_count; ++i) {
3836 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3837 if (res == WAIT_TIMEOUT) {
3838 handles[j++] = handles[i];
3839 } else {
3840 if (res == WAIT_FAILED) {
3841 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3842 GetLastError(), __FILE__, __LINE__);
3843 }
3844 // Don't keep the handle, if we failed waiting for it.
3845 CloseHandle(handles[i]);
3846 }
3847 }
3848
3849 // If there's no free slot in the array of the kept handles, we'll have to
3850 // wait until at least one thread completes exiting.
3851 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3852 // Raise the priority of the oldest exiting thread to increase its chances
3853 // to complete sooner.
3854 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3855 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3856 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3857 i = (res - WAIT_OBJECT_0);
3858 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3859 for (; i < handle_count; ++i) {
3860 handles[i] = handles[i + 1];
3861 }
3862 } else {
3863 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3864 (res == WAIT_FAILED ? "failed" : "timed out"),
3865 GetLastError(), __FILE__, __LINE__);
3866 // Don't keep handles, if we failed waiting for them.
3867 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3868 CloseHandle(handles[i]);
3869 }
3870 handle_count = 0;
3871 }
3872 }
3873
3874 // Store a duplicate of the current thread handle in the array of handles.
3875 hproc = GetCurrentProcess();
3876 hthr = GetCurrentThread();
3877 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3878 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3879 warning("DuplicateHandle failed (%u) in %s: %d\n",
3880 GetLastError(), __FILE__, __LINE__);
3881 } else {
3882 ++handle_count;
3883 }
3884
3885 // The current exiting thread has stored its handle in the array, and now
3886 // should leave the critical section before calling _endthreadex().
3887
3888 } else if (what != EPT_THREAD) {
3889 if (handle_count > 0) {
3890 // Before ending the process, make sure all the threads that had called
3891 // _endthreadex() completed.
3892
3893 // Set the priority level of the current thread to the same value as
3894 // the priority level of exiting threads.
3895 // This is to ensure it will be given a fair chance to execute if
3896 // the timeout expires.
3897 hthr = GetCurrentThread();
3898 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3899 for (i = 0; i < handle_count; ++i) {
3900 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3901 }
3902 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3903 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3904 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3905 (res == WAIT_FAILED ? "failed" : "timed out"),
3906 GetLastError(), __FILE__, __LINE__);
3907 }
3908 for (i = 0; i < handle_count; ++i) {
3909 CloseHandle(handles[i]);
3910 }
3911 handle_count = 0;
3912 }
3913
3914 OrderAccess::release_store(&process_exiting, 1);
3915 }
3916
3917 LeaveCriticalSection(&crit_sect);
3918 }
3919
3920 if (what == EPT_THREAD) {
3921 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3922 // Some other thread is about to call exit(), so we
3923 // don't let the current thread proceed to _endthreadex()
3924 SuspendThread(GetCurrentThread());
3925 // Avoid busy-wait loop, if SuspendThread() failed.
3926 Sleep(EXIT_TIMEOUT);
3927 }
3928 }
3929 }
3930
3931 // We are here if either
3932 // - there's no 'race at exit' bug on this OS release;
3933 // - initialization of the critical section failed (unlikely);
3934 // - the current thread has stored its handle and left the critical section;
3935 // - the process-exiting thread has raised the flag and left the critical section.
3936 if (what == EPT_THREAD) {
3937 _endthreadex((unsigned)exit_code);
3938 } else if (what == EPT_PROCESS) {
3939 ::exit(exit_code);
3940 } else {
3941 _exit(exit_code);
3942 }
3943
3944 // Should not reach here
3945 return exit_code;
3946 }
3947
3948 #undef EXIT_TIMEOUT
3949
3950 void os::win32::setmode_streams() {
3951 _setmode(_fileno(stdin), _O_BINARY);
3952 _setmode(_fileno(stdout), _O_BINARY);
3953 _setmode(_fileno(stderr), _O_BINARY);
3954 }
3955
3956
3957 bool os::is_debugger_attached() {
3958 return IsDebuggerPresent() ? true : false;
3959 }
3960
3961
3962 void os::wait_for_keypress_at_exit(void) {
3963 if (PauseAtExit) {
3964 fprintf(stderr, "Press any key to continue...\n");
3965 fgetc(stdin);
3966 }
3967 }
3968
3969
3970 int os::message_box(const char* title, const char* message) {
3971 int result = MessageBox(NULL, message, title,
3972 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3973 return result == IDYES;
3974 }
3975
3976 int os::allocate_thread_local_storage() {
3977 return TlsAlloc();
3978 }
3979
3980
3981 void os::free_thread_local_storage(int index) {
3982 TlsFree(index);
3983 }
3984
3985
3986 void os::thread_local_storage_at_put(int index, void* value) {
3987 TlsSetValue(index, value);
3988 assert(thread_local_storage_at(index) == value, "Just checking");
3989 }
3990
3991
3992 void* os::thread_local_storage_at(int index) {
3993 return TlsGetValue(index);
3994 }
3995
3996
3997 #ifndef PRODUCT
3998 #ifndef _WIN64
3999 // Helpers to check whether NX protection is enabled
4000 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4001 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4002 pex->ExceptionRecord->NumberParameters > 0 &&
4003 pex->ExceptionRecord->ExceptionInformation[0] ==
4004 EXCEPTION_INFO_EXEC_VIOLATION) {
4005 return EXCEPTION_EXECUTE_HANDLER;
4006 }
4007 return EXCEPTION_CONTINUE_SEARCH;
4008 }
4009
4010 void nx_check_protection() {
4011 // If NX is enabled we'll get an exception calling into code on the stack
4012 char code[] = { (char)0xC3 }; // ret
4013 void *code_ptr = (void *)code;
4014 __try {
4015 __asm call code_ptr
4016 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4017 tty->print_raw_cr("NX protection detected.");
4018 }
4019 }
4020 #endif // _WIN64
4021 #endif // PRODUCT
4022
4023 // this is called _before_ the global arguments have been parsed
4024 void os::init(void) {
4025 _initial_pid = _getpid();
4026
4027 init_random(1234567);
4028
4029 win32::initialize_system_info();
4030 win32::setmode_streams();
4031 init_page_sizes((size_t) win32::vm_page_size());
4032
4033 // This may be overridden later when argument processing is done.
4034 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4035 os::win32::is_windows_2003());
4036
4037 // Initialize main_process and main_thread
4038 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4039 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4040 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4041 fatal("DuplicateHandle failed\n");
4042 }
4043 main_thread_id = (int) GetCurrentThreadId();
4044 }
4045
4046 // To install functions for atexit processing
4047 extern "C" {
4048 static void perfMemory_exit_helper() {
4049 perfMemory_exit();
4050 }
4051 }
4052
4053 static jint initSock();
4054
4055 // this is called _after_ the global arguments have been parsed
4056 jint os::init_2(void) {
4057 // Allocate a single page and mark it as readable for safepoint polling
4058 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4059 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4060
4061 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4062 guarantee(return_page != NULL, "Commit Failed for polling page");
4063
4064 os::set_polling_page(polling_page);
4065
4066 #ifndef PRODUCT
4067 if (Verbose && PrintMiscellaneous) {
4068 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4069 (intptr_t)polling_page);
4070 }
4071 #endif
4072
4073 if (!UseMembar) {
4074 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4075 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4076
4077 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4078 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4079
4080 os::set_memory_serialize_page(mem_serialize_page);
4081
4082 #ifndef PRODUCT
4083 if (Verbose && PrintMiscellaneous) {
4084 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4085 (intptr_t)mem_serialize_page);
4086 }
4087 #endif
4088 }
4089
4090 // Setup Windows Exceptions
4091
4092 // for debugging float code generation bugs
4093 if (ForceFloatExceptions) {
4094 #ifndef _WIN64
4095 static long fp_control_word = 0;
4096 __asm { fstcw fp_control_word }
4097 // see Intel PPro Manual, Vol. 2, p 7-16
4098 const long precision = 0x20;
4099 const long underflow = 0x10;
4100 const long overflow = 0x08;
4101 const long zero_div = 0x04;
4102 const long denorm = 0x02;
4103 const long invalid = 0x01;
4104 fp_control_word |= invalid;
4105 __asm { fldcw fp_control_word }
4106 #endif
4107 }
4108
4109 // If stack_commit_size is 0, windows will reserve the default size,
4110 // but only commit a small portion of it.
4111 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4112 size_t default_reserve_size = os::win32::default_stack_size();
4113 size_t actual_reserve_size = stack_commit_size;
4114 if (stack_commit_size < default_reserve_size) {
4115 // If stack_commit_size == 0, we want this too
4116 actual_reserve_size = default_reserve_size;
4117 }
4118
4119 // Check minimum allowable stack size for thread creation and to initialize
4120 // the java system classes, including StackOverflowError - depends on page
4121 // size. Add a page for compiler2 recursion in main thread.
4122 // Add in 2*BytesPerWord times page size to account for VM stack during
4123 // class initialization depending on 32 or 64 bit VM.
4124 size_t min_stack_allowed =
4125 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4126 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4127 if (actual_reserve_size < min_stack_allowed) {
4128 tty->print_cr("\nThe stack size specified is too small, "
4129 "Specify at least %dk",
4130 min_stack_allowed / K);
4131 return JNI_ERR;
4132 }
4133
4134 JavaThread::set_stack_size_at_create(stack_commit_size);
4135
4136 // Calculate theoretical max. size of Threads to guard gainst artifical
4137 // out-of-memory situations, where all available address-space has been
4138 // reserved by thread stacks.
4139 assert(actual_reserve_size != 0, "Must have a stack");
4140
4141 // Calculate the thread limit when we should start doing Virtual Memory
4142 // banging. Currently when the threads will have used all but 200Mb of space.
4143 //
4144 // TODO: consider performing a similar calculation for commit size instead
4145 // as reserve size, since on a 64-bit platform we'll run into that more
4146 // often than running out of virtual memory space. We can use the
4147 // lower value of the two calculations as the os_thread_limit.
4148 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4149 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4150
4151 // at exit methods are called in the reverse order of their registration.
4152 // there is no limit to the number of functions registered. atexit does
4153 // not set errno.
4154
4155 if (PerfAllowAtExitRegistration) {
4156 // only register atexit functions if PerfAllowAtExitRegistration is set.
4157 // atexit functions can be delayed until process exit time, which
4158 // can be problematic for embedded VM situations. Embedded VMs should
4159 // call DestroyJavaVM() to assure that VM resources are released.
4160
4161 // note: perfMemory_exit_helper atexit function may be removed in
4162 // the future if the appropriate cleanup code can be added to the
4163 // VM_Exit VMOperation's doit method.
4164 if (atexit(perfMemory_exit_helper) != 0) {
4165 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4166 }
4167 }
4168
4169 #ifndef _WIN64
4170 // Print something if NX is enabled (win32 on AMD64)
4171 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4172 #endif
4173
4174 // initialize thread priority policy
4175 prio_init();
4176
4177 if (UseNUMA && !ForceNUMA) {
4178 UseNUMA = false; // We don't fully support this yet
4179 }
4180
4181 if (UseNUMAInterleaving) {
4182 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4183 bool success = numa_interleaving_init();
4184 if (!success) UseNUMAInterleaving = false;
4185 }
4186
4187 if (initSock() != JNI_OK) {
4188 return JNI_ERR;
4189 }
4190
4191 return JNI_OK;
4192 }
4193
4194 // Mark the polling page as unreadable
4195 void os::make_polling_page_unreadable(void) {
4196 DWORD old_status;
4197 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4198 PAGE_NOACCESS, &old_status)) {
4199 fatal("Could not disable polling page");
4200 }
4201 }
4202
4203 // Mark the polling page as readable
4204 void os::make_polling_page_readable(void) {
4205 DWORD old_status;
4206 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4207 PAGE_READONLY, &old_status)) {
4208 fatal("Could not enable polling page");
4209 }
4210 }
4211
4212
4213 int os::stat(const char *path, struct stat *sbuf) {
4214 char pathbuf[MAX_PATH];
4215 if (strlen(path) > MAX_PATH - 1) {
4216 errno = ENAMETOOLONG;
4217 return -1;
4218 }
4219 os::native_path(strcpy(pathbuf, path));
4220 int ret = ::stat(pathbuf, sbuf);
4221 if (sbuf != NULL && UseUTCFileTimestamp) {
4222 // Fix for 6539723. st_mtime returned from stat() is dependent on
4223 // the system timezone and so can return different values for the
4224 // same file if/when daylight savings time changes. This adjustment
4225 // makes sure the same timestamp is returned regardless of the TZ.
4226 //
4227 // See:
4228 // http://msdn.microsoft.com/library/
4229 // default.asp?url=/library/en-us/sysinfo/base/
4230 // time_zone_information_str.asp
4231 // and
4232 // http://msdn.microsoft.com/library/default.asp?url=
4233 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4234 //
4235 // NOTE: there is a insidious bug here: If the timezone is changed
4236 // after the call to stat() but before 'GetTimeZoneInformation()', then
4237 // the adjustment we do here will be wrong and we'll return the wrong
4238 // value (which will likely end up creating an invalid class data
4239 // archive). Absent a better API for this, or some time zone locking
4240 // mechanism, we'll have to live with this risk.
4241 TIME_ZONE_INFORMATION tz;
4242 DWORD tzid = GetTimeZoneInformation(&tz);
4243 int daylightBias =
4244 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4245 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4246 }
4247 return ret;
4248 }
4249
4250
4251 #define FT2INT64(ft) \
4252 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4253
4254
4255 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4256 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4257 // of a thread.
4258 //
4259 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4260 // the fast estimate available on the platform.
4261
4262 // current_thread_cpu_time() is not optimized for Windows yet
4263 jlong os::current_thread_cpu_time() {
4264 // return user + sys since the cost is the same
4265 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4266 }
4267
4268 jlong os::thread_cpu_time(Thread* thread) {
4269 // consistent with what current_thread_cpu_time() returns.
4270 return os::thread_cpu_time(thread, true /* user+sys */);
4271 }
4272
4273 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4274 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4275 }
4276
4277 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4278 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4279 // If this function changes, os::is_thread_cpu_time_supported() should too
4280 if (os::win32::is_nt()) {
4281 FILETIME CreationTime;
4282 FILETIME ExitTime;
4283 FILETIME KernelTime;
4284 FILETIME UserTime;
4285
4286 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4287 &ExitTime, &KernelTime, &UserTime) == 0) {
4288 return -1;
4289 } else if (user_sys_cpu_time) {
4290 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4291 } else {
4292 return FT2INT64(UserTime) * 100;
4293 }
4294 } else {
4295 return (jlong) timeGetTime() * 1000000;
4296 }
4297 }
4298
4299 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4300 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4301 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4302 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4303 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4304 }
4305
4306 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4307 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4308 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4309 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4310 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4311 }
4312
4313 bool os::is_thread_cpu_time_supported() {
4314 // see os::thread_cpu_time
4315 if (os::win32::is_nt()) {
4316 FILETIME CreationTime;
4317 FILETIME ExitTime;
4318 FILETIME KernelTime;
4319 FILETIME UserTime;
4320
4321 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4322 &KernelTime, &UserTime) == 0) {
4323 return false;
4324 } else {
4325 return true;
4326 }
4327 } else {
4328 return false;
4329 }
4330 }
4331
4332 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4333 // It does have primitives (PDH API) to get CPU usage and run queue length.
4334 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4335 // If we wanted to implement loadavg on Windows, we have a few options:
4336 //
4337 // a) Query CPU usage and run queue length and "fake" an answer by
4338 // returning the CPU usage if it's under 100%, and the run queue
4339 // length otherwise. It turns out that querying is pretty slow
4340 // on Windows, on the order of 200 microseconds on a fast machine.
4341 // Note that on the Windows the CPU usage value is the % usage
4342 // since the last time the API was called (and the first call
4343 // returns 100%), so we'd have to deal with that as well.
4344 //
4345 // b) Sample the "fake" answer using a sampling thread and store
4346 // the answer in a global variable. The call to loadavg would
4347 // just return the value of the global, avoiding the slow query.
4348 //
4349 // c) Sample a better answer using exponential decay to smooth the
4350 // value. This is basically the algorithm used by UNIX kernels.
4351 //
4352 // Note that sampling thread starvation could affect both (b) and (c).
4353 int os::loadavg(double loadavg[], int nelem) {
4354 return -1;
4355 }
4356
4357
4358 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4359 bool os::dont_yield() {
4360 return DontYieldALot;
4361 }
4362
4363 // This method is a slightly reworked copy of JDK's sysOpen
4364 // from src/windows/hpi/src/sys_api_md.c
4365
4366 int os::open(const char *path, int oflag, int mode) {
4367 char pathbuf[MAX_PATH];
4368
4369 if (strlen(path) > MAX_PATH - 1) {
4370 errno = ENAMETOOLONG;
4371 return -1;
4372 }
4373 os::native_path(strcpy(pathbuf, path));
4374 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4375 }
4376
4377 FILE* os::open(int fd, const char* mode) {
4378 return ::_fdopen(fd, mode);
4379 }
4380
4381 // Is a (classpath) directory empty?
4382 bool os::dir_is_empty(const char* path) {
4383 WIN32_FIND_DATA fd;
4384 HANDLE f = FindFirstFile(path, &fd);
4385 if (f == INVALID_HANDLE_VALUE) {
4386 return true;
4387 }
4388 FindClose(f);
4389 return false;
4390 }
4391
4392 // create binary file, rewriting existing file if required
4393 int os::create_binary_file(const char* path, bool rewrite_existing) {
4394 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4395 if (!rewrite_existing) {
4396 oflags |= _O_EXCL;
4397 }
4398 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4399 }
4400
4401 // return current position of file pointer
4402 jlong os::current_file_offset(int fd) {
4403 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4404 }
4405
4406 // move file pointer to the specified offset
4407 jlong os::seek_to_file_offset(int fd, jlong offset) {
4408 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4409 }
4410
4411
4412 jlong os::lseek(int fd, jlong offset, int whence) {
4413 return (jlong) ::_lseeki64(fd, offset, whence);
4414 }
4415
4416 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4417 OVERLAPPED ov;
4418 DWORD nread;
4419 BOOL result;
4420
4421 ZeroMemory(&ov, sizeof(ov));
4422 ov.Offset = (DWORD)offset;
4423 ov.OffsetHigh = (DWORD)(offset >> 32);
4424
4425 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4426
4427 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4428
4429 return result ? nread : 0;
4430 }
4431
4432
4433 // This method is a slightly reworked copy of JDK's sysNativePath
4434 // from src/windows/hpi/src/path_md.c
4435
4436 // Convert a pathname to native format. On win32, this involves forcing all
4437 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4438 // sometimes rejects '/') and removing redundant separators. The input path is
4439 // assumed to have been converted into the character encoding used by the local
4440 // system. Because this might be a double-byte encoding, care is taken to
4441 // treat double-byte lead characters correctly.
4442 //
4443 // This procedure modifies the given path in place, as the result is never
4444 // longer than the original. There is no error return; this operation always
4445 // succeeds.
4446 char * os::native_path(char *path) {
4447 char *src = path, *dst = path, *end = path;
4448 char *colon = NULL; // If a drive specifier is found, this will
4449 // point to the colon following the drive letter
4450
4451 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4452 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4453 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4454
4455 // Check for leading separators
4456 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4457 while (isfilesep(*src)) {
4458 src++;
4459 }
4460
4461 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4462 // Remove leading separators if followed by drive specifier. This
4463 // hack is necessary to support file URLs containing drive
4464 // specifiers (e.g., "file://c:/path"). As a side effect,
4465 // "/c:/path" can be used as an alternative to "c:/path".
4466 *dst++ = *src++;
4467 colon = dst;
4468 *dst++ = ':';
4469 src++;
4470 } else {
4471 src = path;
4472 if (isfilesep(src[0]) && isfilesep(src[1])) {
4473 // UNC pathname: Retain first separator; leave src pointed at
4474 // second separator so that further separators will be collapsed
4475 // into the second separator. The result will be a pathname
4476 // beginning with "\\\\" followed (most likely) by a host name.
4477 src = dst = path + 1;
4478 path[0] = '\\'; // Force first separator to '\\'
4479 }
4480 }
4481
4482 end = dst;
4483
4484 // Remove redundant separators from remainder of path, forcing all
4485 // separators to be '\\' rather than '/'. Also, single byte space
4486 // characters are removed from the end of the path because those
4487 // are not legal ending characters on this operating system.
4488 //
4489 while (*src != '\0') {
4490 if (isfilesep(*src)) {
4491 *dst++ = '\\'; src++;
4492 while (isfilesep(*src)) src++;
4493 if (*src == '\0') {
4494 // Check for trailing separator
4495 end = dst;
4496 if (colon == dst - 2) break; // "z:\\"
4497 if (dst == path + 1) break; // "\\"
4498 if (dst == path + 2 && isfilesep(path[0])) {
4499 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4500 // beginning of a UNC pathname. Even though it is not, by
4501 // itself, a valid UNC pathname, we leave it as is in order
4502 // to be consistent with the path canonicalizer as well
4503 // as the win32 APIs, which treat this case as an invalid
4504 // UNC pathname rather than as an alias for the root
4505 // directory of the current drive.
4506 break;
4507 }
4508 end = --dst; // Path does not denote a root directory, so
4509 // remove trailing separator
4510 break;
4511 }
4512 end = dst;
4513 } else {
4514 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4515 *dst++ = *src++;
4516 if (*src) *dst++ = *src++;
4517 end = dst;
4518 } else { // Copy a single-byte character
4519 char c = *src++;
4520 *dst++ = c;
4521 // Space is not a legal ending character
4522 if (c != ' ') end = dst;
4523 }
4524 }
4525 }
4526
4527 *end = '\0';
4528
4529 // For "z:", add "." to work around a bug in the C runtime library
4530 if (colon == dst - 1) {
4531 path[2] = '.';
4532 path[3] = '\0';
4533 }
4534
4535 return path;
4536 }
4537
4538 // This code is a copy of JDK's sysSetLength
4539 // from src/windows/hpi/src/sys_api_md.c
4540
4541 int os::ftruncate(int fd, jlong length) {
4542 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4543 long high = (long)(length >> 32);
4544 DWORD ret;
4545
4546 if (h == (HANDLE)(-1)) {
4547 return -1;
4548 }
4549
4550 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4551 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4552 return -1;
4553 }
4554
4555 if (::SetEndOfFile(h) == FALSE) {
4556 return -1;
4557 }
4558
4559 return 0;
4560 }
4561
4562
4563 // This code is a copy of JDK's sysSync
4564 // from src/windows/hpi/src/sys_api_md.c
4565 // except for the legacy workaround for a bug in Win 98
4566
4567 int os::fsync(int fd) {
4568 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4569
4570 if ((!::FlushFileBuffers(handle)) &&
4571 (GetLastError() != ERROR_ACCESS_DENIED)) {
4572 // from winerror.h
4573 return -1;
4574 }
4575 return 0;
4576 }
4577
4578 static int nonSeekAvailable(int, long *);
4579 static int stdinAvailable(int, long *);
4580
4581 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4582 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4583
4584 // This code is a copy of JDK's sysAvailable
4585 // from src/windows/hpi/src/sys_api_md.c
4586
4587 int os::available(int fd, jlong *bytes) {
4588 jlong cur, end;
4589 struct _stati64 stbuf64;
4590
4591 if (::_fstati64(fd, &stbuf64) >= 0) {
4592 int mode = stbuf64.st_mode;
4593 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4594 int ret;
4595 long lpbytes;
4596 if (fd == 0) {
4597 ret = stdinAvailable(fd, &lpbytes);
4598 } else {
4599 ret = nonSeekAvailable(fd, &lpbytes);
4600 }
4601 (*bytes) = (jlong)(lpbytes);
4602 return ret;
4603 }
4604 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4605 return FALSE;
4606 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4607 return FALSE;
4608 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4609 return FALSE;
4610 }
4611 *bytes = end - cur;
4612 return TRUE;
4613 } else {
4614 return FALSE;
4615 }
4616 }
4617
4618 // This code is a copy of JDK's nonSeekAvailable
4619 // from src/windows/hpi/src/sys_api_md.c
4620
4621 static int nonSeekAvailable(int fd, long *pbytes) {
4622 // This is used for available on non-seekable devices
4623 // (like both named and anonymous pipes, such as pipes
4624 // connected to an exec'd process).
4625 // Standard Input is a special case.
4626 HANDLE han;
4627
4628 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4629 return FALSE;
4630 }
4631
4632 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4633 // PeekNamedPipe fails when at EOF. In that case we
4634 // simply make *pbytes = 0 which is consistent with the
4635 // behavior we get on Solaris when an fd is at EOF.
4636 // The only alternative is to raise an Exception,
4637 // which isn't really warranted.
4638 //
4639 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4640 return FALSE;
4641 }
4642 *pbytes = 0;
4643 }
4644 return TRUE;
4645 }
4646
4647 #define MAX_INPUT_EVENTS 2000
4648
4649 // This code is a copy of JDK's stdinAvailable
4650 // from src/windows/hpi/src/sys_api_md.c
4651
4652 static int stdinAvailable(int fd, long *pbytes) {
4653 HANDLE han;
4654 DWORD numEventsRead = 0; // Number of events read from buffer
4655 DWORD numEvents = 0; // Number of events in buffer
4656 DWORD i = 0; // Loop index
4657 DWORD curLength = 0; // Position marker
4658 DWORD actualLength = 0; // Number of bytes readable
4659 BOOL error = FALSE; // Error holder
4660 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4661
4662 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4663 return FALSE;
4664 }
4665
4666 // Construct an array of input records in the console buffer
4667 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4668 if (error == 0) {
4669 return nonSeekAvailable(fd, pbytes);
4670 }
4671
4672 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4673 if (numEvents > MAX_INPUT_EVENTS) {
4674 numEvents = MAX_INPUT_EVENTS;
4675 }
4676
4677 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4678 if (lpBuffer == NULL) {
4679 return FALSE;
4680 }
4681
4682 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4683 if (error == 0) {
4684 os::free(lpBuffer);
4685 return FALSE;
4686 }
4687
4688 // Examine input records for the number of bytes available
4689 for (i=0; i<numEvents; i++) {
4690 if (lpBuffer[i].EventType == KEY_EVENT) {
4691
4692 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4693 &(lpBuffer[i].Event);
4694 if (keyRecord->bKeyDown == TRUE) {
4695 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4696 curLength++;
4697 if (*keyPressed == '\r') {
4698 actualLength = curLength;
4699 }
4700 }
4701 }
4702 }
4703
4704 if (lpBuffer != NULL) {
4705 os::free(lpBuffer);
4706 }
4707
4708 *pbytes = (long) actualLength;
4709 return TRUE;
4710 }
4711
4712 // Map a block of memory.
4713 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4714 char *addr, size_t bytes, bool read_only,
4715 bool allow_exec) {
4716 HANDLE hFile;
4717 char* base;
4718
4719 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4720 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4721 if (hFile == NULL) {
4722 if (PrintMiscellaneous && Verbose) {
4723 DWORD err = GetLastError();
4724 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4725 }
4726 return NULL;
4727 }
4728
4729 if (allow_exec) {
4730 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4731 // unless it comes from a PE image (which the shared archive is not.)
4732 // Even VirtualProtect refuses to give execute access to mapped memory
4733 // that was not previously executable.
4734 //
4735 // Instead, stick the executable region in anonymous memory. Yuck.
4736 // Penalty is that ~4 pages will not be shareable - in the future
4737 // we might consider DLLizing the shared archive with a proper PE
4738 // header so that mapping executable + sharing is possible.
4739
4740 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4741 PAGE_READWRITE);
4742 if (base == NULL) {
4743 if (PrintMiscellaneous && Verbose) {
4744 DWORD err = GetLastError();
4745 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4746 }
4747 CloseHandle(hFile);
4748 return NULL;
4749 }
4750
4751 DWORD bytes_read;
4752 OVERLAPPED overlapped;
4753 overlapped.Offset = (DWORD)file_offset;
4754 overlapped.OffsetHigh = 0;
4755 overlapped.hEvent = NULL;
4756 // ReadFile guarantees that if the return value is true, the requested
4757 // number of bytes were read before returning.
4758 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4759 if (!res) {
4760 if (PrintMiscellaneous && Verbose) {
4761 DWORD err = GetLastError();
4762 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4763 }
4764 release_memory(base, bytes);
4765 CloseHandle(hFile);
4766 return NULL;
4767 }
4768 } else {
4769 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4770 NULL /* file_name */);
4771 if (hMap == NULL) {
4772 if (PrintMiscellaneous && Verbose) {
4773 DWORD err = GetLastError();
4774 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4775 }
4776 CloseHandle(hFile);
4777 return NULL;
4778 }
4779
4780 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4781 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4782 (DWORD)bytes, addr);
4783 if (base == NULL) {
4784 if (PrintMiscellaneous && Verbose) {
4785 DWORD err = GetLastError();
4786 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4787 }
4788 CloseHandle(hMap);
4789 CloseHandle(hFile);
4790 return NULL;
4791 }
4792
4793 if (CloseHandle(hMap) == 0) {
4794 if (PrintMiscellaneous && Verbose) {
4795 DWORD err = GetLastError();
4796 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4797 }
4798 CloseHandle(hFile);
4799 return base;
4800 }
4801 }
4802
4803 if (allow_exec) {
4804 DWORD old_protect;
4805 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4806 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4807
4808 if (!res) {
4809 if (PrintMiscellaneous && Verbose) {
4810 DWORD err = GetLastError();
4811 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4812 }
4813 // Don't consider this a hard error, on IA32 even if the
4814 // VirtualProtect fails, we should still be able to execute
4815 CloseHandle(hFile);
4816 return base;
4817 }
4818 }
4819
4820 if (CloseHandle(hFile) == 0) {
4821 if (PrintMiscellaneous && Verbose) {
4822 DWORD err = GetLastError();
4823 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4824 }
4825 return base;
4826 }
4827
4828 return base;
4829 }
4830
4831
4832 // Remap a block of memory.
4833 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4834 char *addr, size_t bytes, bool read_only,
4835 bool allow_exec) {
4836 // This OS does not allow existing memory maps to be remapped so we
4837 // have to unmap the memory before we remap it.
4838 if (!os::unmap_memory(addr, bytes)) {
4839 return NULL;
4840 }
4841
4842 // There is a very small theoretical window between the unmap_memory()
4843 // call above and the map_memory() call below where a thread in native
4844 // code may be able to access an address that is no longer mapped.
4845
4846 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4847 read_only, allow_exec);
4848 }
4849
4850
4851 // Unmap a block of memory.
4852 // Returns true=success, otherwise false.
4853
4854 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4855 BOOL result = UnmapViewOfFile(addr);
4856 if (result == 0) {
4857 if (PrintMiscellaneous && Verbose) {
4858 DWORD err = GetLastError();
4859 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4860 }
4861 return false;
4862 }
4863 return true;
4864 }
4865
4866 void os::pause() {
4867 char filename[MAX_PATH];
4868 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4869 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4870 } else {
4871 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4872 }
4873
4874 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4875 if (fd != -1) {
4876 struct stat buf;
4877 ::close(fd);
4878 while (::stat(filename, &buf) == 0) {
4879 Sleep(100);
4880 }
4881 } else {
4882 jio_fprintf(stderr,
4883 "Could not open pause file '%s', continuing immediately.\n", filename);
4884 }
4885 }
4886
4887 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4888 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4889 }
4890
4891 // See the caveats for this class in os_windows.hpp
4892 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4893 // into this method and returns false. If no OS EXCEPTION was raised, returns
4894 // true.
4895 // The callback is supposed to provide the method that should be protected.
4896 //
4897 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4898 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4899 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4900 "crash_protection already set?");
4901
4902 bool success = true;
4903 __try {
4904 WatcherThread::watcher_thread()->set_crash_protection(this);
4905 cb.call();
4906 } __except(EXCEPTION_EXECUTE_HANDLER) {
4907 // only for protection, nothing to do
4908 success = false;
4909 }
4910 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4911 return success;
4912 }
4913
4914 // An Event wraps a win32 "CreateEvent" kernel handle.
4915 //
4916 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4917 //
4918 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4919 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4920 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4921 // In addition, an unpark() operation might fetch the handle field, but the
4922 // event could recycle between the fetch and the SetEvent() operation.
4923 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4924 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4925 // on an stale but recycled handle would be harmless, but in practice this might
4926 // confuse other non-Sun code, so it's not a viable approach.
4927 //
4928 // 2: Once a win32 event handle is associated with an Event, it remains associated
4929 // with the Event. The event handle is never closed. This could be construed
4930 // as handle leakage, but only up to the maximum # of threads that have been extant
4931 // at any one time. This shouldn't be an issue, as windows platforms typically
4932 // permit a process to have hundreds of thousands of open handles.
4933 //
4934 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4935 // and release unused handles.
4936 //
4937 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4938 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4939 //
4940 // 5. Use an RCU-like mechanism (Read-Copy Update).
4941 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4942 //
4943 // We use (2).
4944 //
4945 // TODO-FIXME:
4946 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4947 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4948 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4949 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4950 // into a single win32 CreateEvent() handle.
4951 //
4952 // Assumption:
4953 // Only one parker can exist on an event, which is why we allocate
4954 // them per-thread. Multiple unparkers can coexist.
4955 //
4956 // _Event transitions in park()
4957 // -1 => -1 : illegal
4958 // 1 => 0 : pass - return immediately
4959 // 0 => -1 : block; then set _Event to 0 before returning
4960 //
4961 // _Event transitions in unpark()
4962 // 0 => 1 : just return
4963 // 1 => 1 : just return
4964 // -1 => either 0 or 1; must signal target thread
4965 // That is, we can safely transition _Event from -1 to either
4966 // 0 or 1.
4967 //
4968 // _Event serves as a restricted-range semaphore.
4969 // -1 : thread is blocked, i.e. there is a waiter
4970 // 0 : neutral: thread is running or ready,
4971 // could have been signaled after a wait started
4972 // 1 : signaled - thread is running or ready
4973 //
4974 // Another possible encoding of _Event would be with
4975 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4976 //
4977
4978 int os::PlatformEvent::park(jlong Millis) {
4979 // Transitions for _Event:
4980 // -1 => -1 : illegal
4981 // 1 => 0 : pass - return immediately
4982 // 0 => -1 : block; then set _Event to 0 before returning
4983
4984 guarantee(_ParkHandle != NULL , "Invariant");
4985 guarantee(Millis > 0 , "Invariant");
4986
4987 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4988 // the initial park() operation.
4989 // Consider: use atomic decrement instead of CAS-loop
4990
4991 int v;
4992 for (;;) {
4993 v = _Event;
4994 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4995 }
4996 guarantee((v == 0) || (v == 1), "invariant");
4997 if (v != 0) return OS_OK;
4998
4999 // Do this the hard way by blocking ...
5000 // TODO: consider a brief spin here, gated on the success of recent
5001 // spin attempts by this thread.
5002 //
5003 // We decompose long timeouts into series of shorter timed waits.
5004 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5005 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5006 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5007 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5008 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5009 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5010 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5011 // for the already waited time. This policy does not admit any new outcomes.
5012 // In the future, however, we might want to track the accumulated wait time and
5013 // adjust Millis accordingly if we encounter a spurious wakeup.
5014
5015 const int MAXTIMEOUT = 0x10000000;
5016 DWORD rv = WAIT_TIMEOUT;
5017 while (_Event < 0 && Millis > 0) {
5018 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5019 if (Millis > MAXTIMEOUT) {
5020 prd = MAXTIMEOUT;
5021 }
5022 rv = ::WaitForSingleObject(_ParkHandle, prd);
5023 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5024 if (rv == WAIT_TIMEOUT) {
5025 Millis -= prd;
5026 }
5027 }
5028 v = _Event;
5029 _Event = 0;
5030 // see comment at end of os::PlatformEvent::park() below:
5031 OrderAccess::fence();
5032 // If we encounter a nearly simultanous timeout expiry and unpark()
5033 // we return OS_OK indicating we awoke via unpark().
5034 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5035 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5036 }
5037
5038 void os::PlatformEvent::park() {
5039 // Transitions for _Event:
5040 // -1 => -1 : illegal
5041 // 1 => 0 : pass - return immediately
5042 // 0 => -1 : block; then set _Event to 0 before returning
5043
5044 guarantee(_ParkHandle != NULL, "Invariant");
5045 // Invariant: Only the thread associated with the Event/PlatformEvent
5046 // may call park().
5047 // Consider: use atomic decrement instead of CAS-loop
5048 int v;
5049 for (;;) {
5050 v = _Event;
5051 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5052 }
5053 guarantee((v == 0) || (v == 1), "invariant");
5054 if (v != 0) return;
5055
5056 // Do this the hard way by blocking ...
5057 // TODO: consider a brief spin here, gated on the success of recent
5058 // spin attempts by this thread.
5059 while (_Event < 0) {
5060 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5061 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5062 }
5063
5064 // Usually we'll find _Event == 0 at this point, but as
5065 // an optional optimization we clear it, just in case can
5066 // multiple unpark() operations drove _Event up to 1.
5067 _Event = 0;
5068 OrderAccess::fence();
5069 guarantee(_Event >= 0, "invariant");
5070 }
5071
5072 void os::PlatformEvent::unpark() {
5073 guarantee(_ParkHandle != NULL, "Invariant");
5074
5075 // Transitions for _Event:
5076 // 0 => 1 : just return
5077 // 1 => 1 : just return
5078 // -1 => either 0 or 1; must signal target thread
5079 // That is, we can safely transition _Event from -1 to either
5080 // 0 or 1.
5081 // See also: "Semaphores in Plan 9" by Mullender & Cox
5082 //
5083 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5084 // that it will take two back-to-back park() calls for the owning
5085 // thread to block. This has the benefit of forcing a spurious return
5086 // from the first park() call after an unpark() call which will help
5087 // shake out uses of park() and unpark() without condition variables.
5088
5089 if (Atomic::xchg(1, &_Event) >= 0) return;
5090
5091 ::SetEvent(_ParkHandle);
5092 }
5093
5094
5095 // JSR166
5096 // -------------------------------------------------------
5097
5098 // The Windows implementation of Park is very straightforward: Basic
5099 // operations on Win32 Events turn out to have the right semantics to
5100 // use them directly. We opportunistically resuse the event inherited
5101 // from Monitor.
5102
5103 void Parker::park(bool isAbsolute, jlong time) {
5104 guarantee(_ParkEvent != NULL, "invariant");
5105 // First, demultiplex/decode time arguments
5106 if (time < 0) { // don't wait
5107 return;
5108 } else if (time == 0 && !isAbsolute) {
5109 time = INFINITE;
5110 } else if (isAbsolute) {
5111 time -= os::javaTimeMillis(); // convert to relative time
5112 if (time <= 0) { // already elapsed
5113 return;
5114 }
5115 } else { // relative
5116 time /= 1000000; // Must coarsen from nanos to millis
5117 if (time == 0) { // Wait for the minimal time unit if zero
5118 time = 1;
5119 }
5120 }
5121
5122 JavaThread* thread = (JavaThread*)(Thread::current());
5123 assert(thread->is_Java_thread(), "Must be JavaThread");
5124 JavaThread *jt = (JavaThread *)thread;
5125
5126 // Don't wait if interrupted or already triggered
5127 if (Thread::is_interrupted(thread, false) ||
5128 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5129 ResetEvent(_ParkEvent);
5130 return;
5131 } else {
5132 ThreadBlockInVM tbivm(jt);
5133 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5134 jt->set_suspend_equivalent();
5135
5136 WaitForSingleObject(_ParkEvent, time);
5137 ResetEvent(_ParkEvent);
5138
5139 // If externally suspended while waiting, re-suspend
5140 if (jt->handle_special_suspend_equivalent_condition()) {
5141 jt->java_suspend_self();
5142 }
5143 }
5144 }
5145
5146 void Parker::unpark() {
5147 guarantee(_ParkEvent != NULL, "invariant");
5148 SetEvent(_ParkEvent);
5149 }
5150
5151 // Run the specified command in a separate process. Return its exit value,
5152 // or -1 on failure (e.g. can't create a new process).
5153 int os::fork_and_exec(char* cmd) {
5154 STARTUPINFO si;
5155 PROCESS_INFORMATION pi;
5156
5157 memset(&si, 0, sizeof(si));
5158 si.cb = sizeof(si);
5159 memset(&pi, 0, sizeof(pi));
5160 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5161 cmd, // command line
5162 NULL, // process security attribute
5163 NULL, // thread security attribute
5164 TRUE, // inherits system handles
5165 0, // no creation flags
5166 NULL, // use parent's environment block
5167 NULL, // use parent's starting directory
5168 &si, // (in) startup information
5169 &pi); // (out) process information
5170
5171 if (rslt) {
5172 // Wait until child process exits.
5173 WaitForSingleObject(pi.hProcess, INFINITE);
5174
5175 DWORD exit_code;
5176 GetExitCodeProcess(pi.hProcess, &exit_code);
5177
5178 // Close process and thread handles.
5179 CloseHandle(pi.hProcess);
5180 CloseHandle(pi.hThread);
5181
5182 return (int)exit_code;
5183 } else {
5184 return -1;
5185 }
5186 }
5187
5188 //--------------------------------------------------------------------------------------------------
5189 // Non-product code
5190
5191 static int mallocDebugIntervalCounter = 0;
5192 static int mallocDebugCounter = 0;
5193 bool os::check_heap(bool force) {
5194 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5195 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5196 // Note: HeapValidate executes two hardware breakpoints when it finds something
5197 // wrong; at these points, eax contains the address of the offending block (I think).
5198 // To get to the exlicit error message(s) below, just continue twice.
5199 HANDLE heap = GetProcessHeap();
5200
5201 // If we fail to lock the heap, then gflags.exe has been used
5202 // or some other special heap flag has been set that prevents
5203 // locking. We don't try to walk a heap we can't lock.
5204 if (HeapLock(heap) != 0) {
5205 PROCESS_HEAP_ENTRY phe;
5206 phe.lpData = NULL;
5207 while (HeapWalk(heap, &phe) != 0) {
5208 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5209 !HeapValidate(heap, 0, phe.lpData)) {
5210 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5211 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5212 fatal("corrupted C heap");
5213 }
5214 }
5215 DWORD err = GetLastError();
5216 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5217 fatal(err_msg("heap walk aborted with error %d", err));
5218 }
5219 HeapUnlock(heap);
5220 }
5221 mallocDebugIntervalCounter = 0;
5222 }
5223 return true;
5224 }
5225
5226
5227 bool os::find(address addr, outputStream* st) {
5228 // Nothing yet
5229 return false;
5230 }
5231
5232 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5233 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5234
5235 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5236 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5237 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5238 address addr = (address) exceptionRecord->ExceptionInformation[1];
5239
5240 if (os::is_memory_serialize_page(thread, addr)) {
5241 return EXCEPTION_CONTINUE_EXECUTION;
5242 }
5243 }
5244
5245 return EXCEPTION_CONTINUE_SEARCH;
5246 }
5247
5248 // We don't build a headless jre for Windows
5249 bool os::is_headless_jre() { return false; }
5250
5251 static jint initSock() {
5252 WSADATA wsadata;
5253
5254 if (!os::WinSock2Dll::WinSock2Available()) {
5255 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5256 ::GetLastError());
5257 return JNI_ERR;
5258 }
5259
5260 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5261 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5262 ::GetLastError());
5263 return JNI_ERR;
5264 }
5265 return JNI_OK;
5266 }
5267
5268 struct hostent* os::get_host_by_name(char* name) {
5269 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5270 }
5271
5272 int os::socket_close(int fd) {
5273 return ::closesocket(fd);
5274 }
5275
5276 int os::socket(int domain, int type, int protocol) {
5277 return ::socket(domain, type, protocol);
5278 }
5279
5280 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5281 return ::connect(fd, him, len);
5282 }
5283
5284 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5285 return ::recv(fd, buf, (int)nBytes, flags);
5286 }
5287
5288 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5289 return ::send(fd, buf, (int)nBytes, flags);
5290 }
5291
5292 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5293 return ::send(fd, buf, (int)nBytes, flags);
5294 }
5295
5296 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5297 #if defined(IA32)
5298 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5299 #elif defined (AMD64)
5300 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5301 #endif
5302
5303 // returns true if thread could be suspended,
5304 // false otherwise
5305 static bool do_suspend(HANDLE* h) {
5306 if (h != NULL) {
5307 if (SuspendThread(*h) != ~0) {
5308 return true;
5309 }
5310 }
5311 return false;
5312 }
5313
5314 // resume the thread
5315 // calling resume on an active thread is a no-op
5316 static void do_resume(HANDLE* h) {
5317 if (h != NULL) {
5318 ResumeThread(*h);
5319 }
5320 }
5321
5322 // retrieve a suspend/resume context capable handle
5323 // from the tid. Caller validates handle return value.
5324 void get_thread_handle_for_extended_context(HANDLE* h,
5325 OSThread::thread_id_t tid) {
5326 if (h != NULL) {
5327 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5328 }
5329 }
5330
5331 // Thread sampling implementation
5332 //
5333 void os::SuspendedThreadTask::internal_do_task() {
5334 CONTEXT ctxt;
5335 HANDLE h = NULL;
5336
5337 // get context capable handle for thread
5338 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5339
5340 // sanity
5341 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5342 return;
5343 }
5344
5345 // suspend the thread
5346 if (do_suspend(&h)) {
5347 ctxt.ContextFlags = sampling_context_flags;
5348 // get thread context
5349 GetThreadContext(h, &ctxt);
5350 SuspendedThreadTaskContext context(_thread, &ctxt);
5351 // pass context to Thread Sampling impl
5352 do_task(context);
5353 // resume thread
5354 do_resume(&h);
5355 }
5356
5357 // close handle
5358 CloseHandle(h);
5359 }
5360
5361
5362 // Kernel32 API
5363 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5364 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5365 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5366 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5367 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5368
5369 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5370 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5371 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5372 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5373 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5374
5375
5376 BOOL os::Kernel32Dll::initialized = FALSE;
5377 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5378 assert(initialized && _GetLargePageMinimum != NULL,
5379 "GetLargePageMinimumAvailable() not yet called");
5380 return _GetLargePageMinimum();
5381 }
5382
5383 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5384 if (!initialized) {
5385 initialize();
5386 }
5387 return _GetLargePageMinimum != NULL;
5388 }
5389
5390 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5391 if (!initialized) {
5392 initialize();
5393 }
5394 return _VirtualAllocExNuma != NULL;
5395 }
5396
5397 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5398 SIZE_T bytes, DWORD flags,
5399 DWORD prot, DWORD node) {
5400 assert(initialized && _VirtualAllocExNuma != NULL,
5401 "NUMACallsAvailable() not yet called");
5402
5403 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5404 }
5405
5406 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5407 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5408 "NUMACallsAvailable() not yet called");
5409
5410 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5411 }
5412
5413 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5414 PULONGLONG proc_mask) {
5415 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5416 "NUMACallsAvailable() not yet called");
5417
5418 return _GetNumaNodeProcessorMask(node, proc_mask);
5419 }
5420
5421 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5422 ULONG FrameToCapture,
5423 PVOID* BackTrace,
5424 PULONG BackTraceHash) {
5425 if (!initialized) {
5426 initialize();
5427 }
5428
5429 if (_RtlCaptureStackBackTrace != NULL) {
5430 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5431 BackTrace, BackTraceHash);
5432 } else {
5433 return 0;
5434 }
5435 }
5436
5437 void os::Kernel32Dll::initializeCommon() {
5438 if (!initialized) {
5439 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5440 assert(handle != NULL, "Just check");
5441 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5442 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5443 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5444 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5445 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5446 initialized = TRUE;
5447 }
5448 }
5449
5450
5451
5452 #ifndef JDK6_OR_EARLIER
5453
5454 void os::Kernel32Dll::initialize() {
5455 initializeCommon();
5456 }
5457
5458
5459 // Kernel32 API
5460 inline BOOL os::Kernel32Dll::SwitchToThread() {
5461 return ::SwitchToThread();
5462 }
5463
5464 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5465 return true;
5466 }
5467
5468 // Help tools
5469 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5470 return true;
5471 }
5472
5473 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5474 DWORD th32ProcessId) {
5475 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5476 }
5477
5478 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5479 LPMODULEENTRY32 lpme) {
5480 return ::Module32First(hSnapshot, lpme);
5481 }
5482
5483 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5484 LPMODULEENTRY32 lpme) {
5485 return ::Module32Next(hSnapshot, lpme);
5486 }
5487
5488 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5489 ::GetNativeSystemInfo(lpSystemInfo);
5490 }
5491
5492 // PSAPI API
5493 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5494 HMODULE *lpModule, DWORD cb,
5495 LPDWORD lpcbNeeded) {
5496 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5497 }
5498
5499 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5500 HMODULE hModule,
5501 LPTSTR lpFilename,
5502 DWORD nSize) {
5503 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5504 }
5505
5506 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5507 HMODULE hModule,
5508 LPMODULEINFO lpmodinfo,
5509 DWORD cb) {
5510 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5511 }
5512
5513 inline BOOL os::PSApiDll::PSApiAvailable() {
5514 return true;
5515 }
5516
5517
5518 // WinSock2 API
5519 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5520 LPWSADATA lpWSAData) {
5521 return ::WSAStartup(wVersionRequested, lpWSAData);
5522 }
5523
5524 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5525 return ::gethostbyname(name);
5526 }
5527
5528 inline BOOL os::WinSock2Dll::WinSock2Available() {
5529 return true;
5530 }
5531
5532 // Advapi API
5533 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5534 BOOL DisableAllPrivileges,
5535 PTOKEN_PRIVILEGES NewState,
5536 DWORD BufferLength,
5537 PTOKEN_PRIVILEGES PreviousState,
5538 PDWORD ReturnLength) {
5539 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5540 BufferLength, PreviousState, ReturnLength);
5541 }
5542
5543 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5544 DWORD DesiredAccess,
5545 PHANDLE TokenHandle) {
5546 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5547 }
5548
5549 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5550 LPCTSTR lpName,
5551 PLUID lpLuid) {
5552 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5553 }
5554
5555 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5556 return true;
5557 }
5558
5559 void* os::get_default_process_handle() {
5560 return (void*)GetModuleHandle(NULL);
5561 }
5562
5563 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5564 // which is used to find statically linked in agents.
5565 // Additionally for windows, takes into account __stdcall names.
5566 // Parameters:
5567 // sym_name: Symbol in library we are looking for
5568 // lib_name: Name of library to look in, NULL for shared libs.
5569 // is_absolute_path == true if lib_name is absolute path to agent
5570 // such as "C:/a/b/L.dll"
5571 // == false if only the base name of the library is passed in
5572 // such as "L"
5573 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5574 bool is_absolute_path) {
5575 char *agent_entry_name;
5576 size_t len;
5577 size_t name_len;
5578 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5579 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5580 const char *start;
5581
5582 if (lib_name != NULL) {
5583 len = name_len = strlen(lib_name);
5584 if (is_absolute_path) {
5585 // Need to strip path, prefix and suffix
5586 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5587 lib_name = ++start;
5588 } else {
5589 // Need to check for drive prefix
5590 if ((start = strchr(lib_name, ':')) != NULL) {
5591 lib_name = ++start;
5592 }
5593 }
5594 if (len <= (prefix_len + suffix_len)) {
5595 return NULL;
5596 }
5597 lib_name += prefix_len;
5598 name_len = strlen(lib_name) - suffix_len;
5599 }
5600 }
5601 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5602 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5603 if (agent_entry_name == NULL) {
5604 return NULL;
5605 }
5606 if (lib_name != NULL) {
5607 const char *p = strrchr(sym_name, '@');
5608 if (p != NULL && p != sym_name) {
5609 // sym_name == _Agent_OnLoad@XX
5610 strncpy(agent_entry_name, sym_name, (p - sym_name));
5611 agent_entry_name[(p-sym_name)] = '\0';
5612 // agent_entry_name == _Agent_OnLoad
5613 strcat(agent_entry_name, "_");
5614 strncat(agent_entry_name, lib_name, name_len);
5615 strcat(agent_entry_name, p);
5616 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5617 } else {
5618 strcpy(agent_entry_name, sym_name);
5619 strcat(agent_entry_name, "_");
5620 strncat(agent_entry_name, lib_name, name_len);
5621 }
5622 } else {
5623 strcpy(agent_entry_name, sym_name);
5624 }
5625 return agent_entry_name;
5626 }
5627
5628 #else
5629 // Kernel32 API
5630 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5631 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5632 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5633 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5634 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5635
5636 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5637 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5638 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5639 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5640 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5641
5642 void os::Kernel32Dll::initialize() {
5643 if (!initialized) {
5644 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5645 assert(handle != NULL, "Just check");
5646
5647 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5648 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5649 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5650 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5651 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5652 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5653 initializeCommon(); // resolve the functions that always need resolving
5654
5655 initialized = TRUE;
5656 }
5657 }
5658
5659 BOOL os::Kernel32Dll::SwitchToThread() {
5660 assert(initialized && _SwitchToThread != NULL,
5661 "SwitchToThreadAvailable() not yet called");
5662 return _SwitchToThread();
5663 }
5664
5665
5666 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5667 if (!initialized) {
5668 initialize();
5669 }
5670 return _SwitchToThread != NULL;
5671 }
5672
5673 // Help tools
5674 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5675 if (!initialized) {
5676 initialize();
5677 }
5678 return _CreateToolhelp32Snapshot != NULL &&
5679 _Module32First != NULL &&
5680 _Module32Next != NULL;
5681 }
5682
5683 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5684 DWORD th32ProcessId) {
5685 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5686 "HelpToolsAvailable() not yet called");
5687
5688 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5689 }
5690
5691 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5692 assert(initialized && _Module32First != NULL,
5693 "HelpToolsAvailable() not yet called");
5694
5695 return _Module32First(hSnapshot, lpme);
5696 }
5697
5698 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5699 LPMODULEENTRY32 lpme) {
5700 assert(initialized && _Module32Next != NULL,
5701 "HelpToolsAvailable() not yet called");
5702
5703 return _Module32Next(hSnapshot, lpme);
5704 }
5705
5706
5707 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5708 if (!initialized) {
5709 initialize();
5710 }
5711 return _GetNativeSystemInfo != NULL;
5712 }
5713
5714 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5715 assert(initialized && _GetNativeSystemInfo != NULL,
5716 "GetNativeSystemInfoAvailable() not yet called");
5717
5718 _GetNativeSystemInfo(lpSystemInfo);
5719 }
5720
5721 // PSAPI API
5722
5723
5724 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5725 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5726 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5727
5728 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5729 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5730 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5731 BOOL os::PSApiDll::initialized = FALSE;
5732
5733 void os::PSApiDll::initialize() {
5734 if (!initialized) {
5735 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5736 if (handle != NULL) {
5737 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5738 "EnumProcessModules");
5739 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5740 "GetModuleFileNameExA");
5741 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5742 "GetModuleInformation");
5743 }
5744 initialized = TRUE;
5745 }
5746 }
5747
5748
5749
5750 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5751 DWORD cb, LPDWORD lpcbNeeded) {
5752 assert(initialized && _EnumProcessModules != NULL,
5753 "PSApiAvailable() not yet called");
5754 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5755 }
5756
5757 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5758 LPTSTR lpFilename, DWORD nSize) {
5759 assert(initialized && _GetModuleFileNameEx != NULL,
5760 "PSApiAvailable() not yet called");
5761 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5762 }
5763
5764 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5765 LPMODULEINFO lpmodinfo, DWORD cb) {
5766 assert(initialized && _GetModuleInformation != NULL,
5767 "PSApiAvailable() not yet called");
5768 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5769 }
5770
5771 BOOL os::PSApiDll::PSApiAvailable() {
5772 if (!initialized) {
5773 initialize();
5774 }
5775 return _EnumProcessModules != NULL &&
5776 _GetModuleFileNameEx != NULL &&
5777 _GetModuleInformation != NULL;
5778 }
5779
5780
5781 // WinSock2 API
5782 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5783 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5784
5785 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5786 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5787 BOOL os::WinSock2Dll::initialized = FALSE;
5788
5789 void os::WinSock2Dll::initialize() {
5790 if (!initialized) {
5791 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5792 if (handle != NULL) {
5793 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5794 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5795 }
5796 initialized = TRUE;
5797 }
5798 }
5799
5800
5801 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5802 assert(initialized && _WSAStartup != NULL,
5803 "WinSock2Available() not yet called");
5804 return _WSAStartup(wVersionRequested, lpWSAData);
5805 }
5806
5807 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5808 assert(initialized && _gethostbyname != NULL,
5809 "WinSock2Available() not yet called");
5810 return _gethostbyname(name);
5811 }
5812
5813 BOOL os::WinSock2Dll::WinSock2Available() {
5814 if (!initialized) {
5815 initialize();
5816 }
5817 return _WSAStartup != NULL &&
5818 _gethostbyname != NULL;
5819 }
5820
5821 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5822 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5823 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5824
5825 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5826 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5827 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5828 BOOL os::Advapi32Dll::initialized = FALSE;
5829
5830 void os::Advapi32Dll::initialize() {
5831 if (!initialized) {
5832 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5833 if (handle != NULL) {
5834 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5835 "AdjustTokenPrivileges");
5836 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5837 "OpenProcessToken");
5838 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5839 "LookupPrivilegeValueA");
5840 }
5841 initialized = TRUE;
5842 }
5843 }
5844
5845 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5846 BOOL DisableAllPrivileges,
5847 PTOKEN_PRIVILEGES NewState,
5848 DWORD BufferLength,
5849 PTOKEN_PRIVILEGES PreviousState,
5850 PDWORD ReturnLength) {
5851 assert(initialized && _AdjustTokenPrivileges != NULL,
5852 "AdvapiAvailable() not yet called");
5853 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5854 BufferLength, PreviousState, ReturnLength);
5855 }
5856
5857 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5858 DWORD DesiredAccess,
5859 PHANDLE TokenHandle) {
5860 assert(initialized && _OpenProcessToken != NULL,
5861 "AdvapiAvailable() not yet called");
5862 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5863 }
5864
5865 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5866 LPCTSTR lpName, PLUID lpLuid) {
5867 assert(initialized && _LookupPrivilegeValue != NULL,
5868 "AdvapiAvailable() not yet called");
5869 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5870 }
5871
5872 BOOL os::Advapi32Dll::AdvapiAvailable() {
5873 if (!initialized) {
5874 initialize();
5875 }
5876 return _AdjustTokenPrivileges != NULL &&
5877 _OpenProcessToken != NULL &&
5878 _LookupPrivilegeValue != NULL;
5879 }
5880
5881 #endif
5882
5883 #ifndef PRODUCT
5884
5885 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5886 // contiguous memory block at a particular address.
5887 // The test first tries to find a good approximate address to allocate at by using the same
5888 // method to allocate some memory at any address. The test then tries to allocate memory in
5889 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5890 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5891 // the previously allocated memory is available for allocation. The only actual failure
5892 // that is reported is when the test tries to allocate at a particular location but gets a
5893 // different valid one. A NULL return value at this point is not considered an error but may
5894 // be legitimate.
5895 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5896 void TestReserveMemorySpecial_test() {
5897 if (!UseLargePages) {
5898 if (VerboseInternalVMTests) {
5899 gclog_or_tty->print("Skipping test because large pages are disabled");
5900 }
5901 return;
5902 }
5903 // save current value of globals
5904 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5905 bool old_use_numa_interleaving = UseNUMAInterleaving;
5906
5907 // set globals to make sure we hit the correct code path
5908 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5909
5910 // do an allocation at an address selected by the OS to get a good one.
5911 const size_t large_allocation_size = os::large_page_size() * 4;
5912 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5913 if (result == NULL) {
5914 if (VerboseInternalVMTests) {
5915 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5916 large_allocation_size);
5917 }
5918 } else {
5919 os::release_memory_special(result, large_allocation_size);
5920
5921 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5922 // we managed to get it once.
5923 const size_t expected_allocation_size = os::large_page_size();
5924 char* expected_location = result + os::large_page_size();
5925 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5926 if (actual_location == NULL) {
5927 if (VerboseInternalVMTests) {
5928 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5929 expected_location, large_allocation_size);
5930 }
5931 } else {
5932 // release memory
5933 os::release_memory_special(actual_location, expected_allocation_size);
5934 // only now check, after releasing any memory to avoid any leaks.
5935 assert(actual_location == expected_location,
5936 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5937 expected_location, expected_allocation_size, actual_location));
5938 }
5939 }
5940
5941 // restore globals
5942 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5943 UseNUMAInterleaving = old_use_numa_interleaving;
5944 }
5945 #endif // PRODUCT