1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 thread->initialize_thread_current();
423
424 OSThread* osthr = thread->osthread();
425 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
426
427 if (UseNUMA) {
428 int lgrp_id = os::numa_get_group_id();
429 if (lgrp_id != -1) {
430 thread->set_lgrp_id(lgrp_id);
431 }
432 }
433
434 // Diagnostic code to investigate JDK-6573254
435 int res = 30115; // non-java thread
436 if (thread->is_Java_thread()) {
437 res = 20115; // java thread
438 }
439
440 // Install a win32 structured exception handler around every thread created
441 // by VM, so VM can generate error dump when an exception occurred in non-
442 // Java thread (e.g. VM thread).
443 __try {
444 thread->run();
445 } __except(topLevelExceptionFilter(
446 (_EXCEPTION_POINTERS*)_exception_info())) {
447 // Nothing to do.
448 }
449
450 // One less thread is executing
451 // When the VMThread gets here, the main thread may have already exited
452 // which frees the CodeHeap containing the Atomic::add code
453 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
454 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
455 }
456
457 // Thread must not return from exit_process_or_thread(), but if it does,
458 // let it proceed to exit normally
459 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
460 }
461
462 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
463 int thread_id) {
464 // Allocate the OSThread object
465 OSThread* osthread = new OSThread(NULL, NULL);
466 if (osthread == NULL) return NULL;
467
468 // Initialize support for Java interrupts
469 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
470 if (interrupt_event == NULL) {
471 delete osthread;
472 return NULL;
473 }
474 osthread->set_interrupt_event(interrupt_event);
475
476 // Store info on the Win32 thread into the OSThread
477 osthread->set_thread_handle(thread_handle);
478 osthread->set_thread_id(thread_id);
479
480 if (UseNUMA) {
481 int lgrp_id = os::numa_get_group_id();
482 if (lgrp_id != -1) {
483 thread->set_lgrp_id(lgrp_id);
484 }
485 }
486
487 // Initial thread state is INITIALIZED, not SUSPENDED
488 osthread->set_state(INITIALIZED);
489
490 return osthread;
491 }
492
493
494 bool os::create_attached_thread(JavaThread* thread) {
495 #ifdef ASSERT
496 thread->verify_not_published();
497 #endif
498 HANDLE thread_h;
499 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
500 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
501 fatal("DuplicateHandle failed\n");
502 }
503 OSThread* osthread = create_os_thread(thread, thread_h,
504 (int)current_thread_id());
505 if (osthread == NULL) {
506 return false;
507 }
508
509 // Initial thread state is RUNNABLE
510 osthread->set_state(RUNNABLE);
511
512 thread->set_osthread(osthread);
513 return true;
514 }
515
516 bool os::create_main_thread(JavaThread* thread) {
517 #ifdef ASSERT
518 thread->verify_not_published();
519 #endif
520 if (_starting_thread == NULL) {
521 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
522 if (_starting_thread == NULL) {
523 return false;
524 }
525 }
526
527 // The primordial thread is runnable from the start)
528 _starting_thread->set_state(RUNNABLE);
529
530 thread->set_osthread(_starting_thread);
531 return true;
532 }
533
534 // Allocate and initialize a new OSThread
535 bool os::create_thread(Thread* thread, ThreadType thr_type,
536 size_t stack_size) {
537 unsigned thread_id;
538
539 // Allocate the OSThread object
540 OSThread* osthread = new OSThread(NULL, NULL);
541 if (osthread == NULL) {
542 return false;
543 }
544
545 // Initialize support for Java interrupts
546 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
547 if (interrupt_event == NULL) {
548 delete osthread;
549 return NULL;
550 }
551 osthread->set_interrupt_event(interrupt_event);
552 osthread->set_interrupted(false);
553
554 thread->set_osthread(osthread);
555
556 if (stack_size == 0) {
557 switch (thr_type) {
558 case os::java_thread:
559 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
560 if (JavaThread::stack_size_at_create() > 0) {
561 stack_size = JavaThread::stack_size_at_create();
562 }
563 break;
564 case os::compiler_thread:
565 if (CompilerThreadStackSize > 0) {
566 stack_size = (size_t)(CompilerThreadStackSize * K);
567 break;
568 } // else fall through:
569 // use VMThreadStackSize if CompilerThreadStackSize is not defined
570 case os::vm_thread:
571 case os::pgc_thread:
572 case os::cgc_thread:
573 case os::watcher_thread:
574 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
575 break;
576 }
577 }
578
579 // Create the Win32 thread
580 //
581 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
582 // does not specify stack size. Instead, it specifies the size of
583 // initially committed space. The stack size is determined by
584 // PE header in the executable. If the committed "stack_size" is larger
585 // than default value in the PE header, the stack is rounded up to the
586 // nearest multiple of 1MB. For example if the launcher has default
587 // stack size of 320k, specifying any size less than 320k does not
588 // affect the actual stack size at all, it only affects the initial
589 // commitment. On the other hand, specifying 'stack_size' larger than
590 // default value may cause significant increase in memory usage, because
591 // not only the stack space will be rounded up to MB, but also the
592 // entire space is committed upfront.
593 //
594 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
595 // for CreateThread() that can treat 'stack_size' as stack size. However we
596 // are not supposed to call CreateThread() directly according to MSDN
597 // document because JVM uses C runtime library. The good news is that the
598 // flag appears to work with _beginthredex() as well.
599
600 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
601 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
602 #endif
603
604 HANDLE thread_handle =
605 (HANDLE)_beginthreadex(NULL,
606 (unsigned)stack_size,
607 (unsigned (__stdcall *)(void*)) java_start,
608 thread,
609 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
610 &thread_id);
611 if (thread_handle == NULL) {
612 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
613 // without the flag.
614 thread_handle =
615 (HANDLE)_beginthreadex(NULL,
616 (unsigned)stack_size,
617 (unsigned (__stdcall *)(void*)) java_start,
618 thread,
619 CREATE_SUSPENDED,
620 &thread_id);
621 }
622 if (thread_handle == NULL) {
623 // Need to clean up stuff we've allocated so far
624 CloseHandle(osthread->interrupt_event());
625 thread->set_osthread(NULL);
626 delete osthread;
627 return NULL;
628 }
629
630 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
631
632 // Store info on the Win32 thread into the OSThread
633 osthread->set_thread_handle(thread_handle);
634 osthread->set_thread_id(thread_id);
635
636 // Initial thread state is INITIALIZED, not SUSPENDED
637 osthread->set_state(INITIALIZED);
638
639 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
640 return true;
641 }
642
643
644 // Free Win32 resources related to the OSThread
645 void os::free_thread(OSThread* osthread) {
646 assert(osthread != NULL, "osthread not set");
647 CloseHandle(osthread->thread_handle());
648 CloseHandle(osthread->interrupt_event());
649 delete osthread;
650 }
651
652 static jlong first_filetime;
653 static jlong initial_performance_count;
654 static jlong performance_frequency;
655
656
657 jlong as_long(LARGE_INTEGER x) {
658 jlong result = 0; // initialization to avoid warning
659 set_high(&result, x.HighPart);
660 set_low(&result, x.LowPart);
661 return result;
662 }
663
664
665 jlong os::elapsed_counter() {
666 LARGE_INTEGER count;
667 if (win32::_has_performance_count) {
668 QueryPerformanceCounter(&count);
669 return as_long(count) - initial_performance_count;
670 } else {
671 FILETIME wt;
672 GetSystemTimeAsFileTime(&wt);
673 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
674 }
675 }
676
677
678 jlong os::elapsed_frequency() {
679 if (win32::_has_performance_count) {
680 return performance_frequency;
681 } else {
682 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
683 return 10000000;
684 }
685 }
686
687
688 julong os::available_memory() {
689 return win32::available_memory();
690 }
691
692 julong os::win32::available_memory() {
693 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
694 // value if total memory is larger than 4GB
695 MEMORYSTATUSEX ms;
696 ms.dwLength = sizeof(ms);
697 GlobalMemoryStatusEx(&ms);
698
699 return (julong)ms.ullAvailPhys;
700 }
701
702 julong os::physical_memory() {
703 return win32::physical_memory();
704 }
705
706 bool os::has_allocatable_memory_limit(julong* limit) {
707 MEMORYSTATUSEX ms;
708 ms.dwLength = sizeof(ms);
709 GlobalMemoryStatusEx(&ms);
710 #ifdef _LP64
711 *limit = (julong)ms.ullAvailVirtual;
712 return true;
713 #else
714 // Limit to 1400m because of the 2gb address space wall
715 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
716 return true;
717 #endif
718 }
719
720 // VC6 lacks DWORD_PTR
721 #if _MSC_VER < 1300
722 typedef UINT_PTR DWORD_PTR;
723 #endif
724
725 int os::active_processor_count() {
726 DWORD_PTR lpProcessAffinityMask = 0;
727 DWORD_PTR lpSystemAffinityMask = 0;
728 int proc_count = processor_count();
729 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
730 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
731 // Nof active processors is number of bits in process affinity mask
732 int bitcount = 0;
733 while (lpProcessAffinityMask != 0) {
734 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
735 bitcount++;
736 }
737 return bitcount;
738 } else {
739 return proc_count;
740 }
741 }
742
743 void os::set_native_thread_name(const char *name) {
744
745 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
746 //
747 // Note that unfortunately this only works if the process
748 // is already attached to a debugger; debugger must observe
749 // the exception below to show the correct name.
750
751 const DWORD MS_VC_EXCEPTION = 0x406D1388;
752 struct {
753 DWORD dwType; // must be 0x1000
754 LPCSTR szName; // pointer to name (in user addr space)
755 DWORD dwThreadID; // thread ID (-1=caller thread)
756 DWORD dwFlags; // reserved for future use, must be zero
757 } info;
758
759 info.dwType = 0x1000;
760 info.szName = name;
761 info.dwThreadID = -1;
762 info.dwFlags = 0;
763
764 __try {
765 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
766 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
767 }
768
769 bool os::distribute_processes(uint length, uint* distribution) {
770 // Not yet implemented.
771 return false;
772 }
773
774 bool os::bind_to_processor(uint processor_id) {
775 // Not yet implemented.
776 return false;
777 }
778
779 void os::win32::initialize_performance_counter() {
780 LARGE_INTEGER count;
781 if (QueryPerformanceFrequency(&count)) {
782 win32::_has_performance_count = 1;
783 performance_frequency = as_long(count);
784 QueryPerformanceCounter(&count);
785 initial_performance_count = as_long(count);
786 } else {
787 win32::_has_performance_count = 0;
788 FILETIME wt;
789 GetSystemTimeAsFileTime(&wt);
790 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
791 }
792 }
793
794
795 double os::elapsedTime() {
796 return (double) elapsed_counter() / (double) elapsed_frequency();
797 }
798
799
800 // Windows format:
801 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
802 // Java format:
803 // Java standards require the number of milliseconds since 1/1/1970
804
805 // Constant offset - calculated using offset()
806 static jlong _offset = 116444736000000000;
807 // Fake time counter for reproducible results when debugging
808 static jlong fake_time = 0;
809
810 #ifdef ASSERT
811 // Just to be safe, recalculate the offset in debug mode
812 static jlong _calculated_offset = 0;
813 static int _has_calculated_offset = 0;
814
815 jlong offset() {
816 if (_has_calculated_offset) return _calculated_offset;
817 SYSTEMTIME java_origin;
818 java_origin.wYear = 1970;
819 java_origin.wMonth = 1;
820 java_origin.wDayOfWeek = 0; // ignored
821 java_origin.wDay = 1;
822 java_origin.wHour = 0;
823 java_origin.wMinute = 0;
824 java_origin.wSecond = 0;
825 java_origin.wMilliseconds = 0;
826 FILETIME jot;
827 if (!SystemTimeToFileTime(&java_origin, &jot)) {
828 fatal("Error = %d\nWindows error", GetLastError());
829 }
830 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
831 _has_calculated_offset = 1;
832 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
833 return _calculated_offset;
834 }
835 #else
836 jlong offset() {
837 return _offset;
838 }
839 #endif
840
841 jlong windows_to_java_time(FILETIME wt) {
842 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
843 return (a - offset()) / 10000;
844 }
845
846 // Returns time ticks in (10th of micro seconds)
847 jlong windows_to_time_ticks(FILETIME wt) {
848 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
849 return (a - offset());
850 }
851
852 FILETIME java_to_windows_time(jlong l) {
853 jlong a = (l * 10000) + offset();
854 FILETIME result;
855 result.dwHighDateTime = high(a);
856 result.dwLowDateTime = low(a);
857 return result;
858 }
859
860 bool os::supports_vtime() { return true; }
861 bool os::enable_vtime() { return false; }
862 bool os::vtime_enabled() { return false; }
863
864 double os::elapsedVTime() {
865 FILETIME created;
866 FILETIME exited;
867 FILETIME kernel;
868 FILETIME user;
869 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
870 // the resolution of windows_to_java_time() should be sufficient (ms)
871 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
872 } else {
873 return elapsedTime();
874 }
875 }
876
877 jlong os::javaTimeMillis() {
878 if (UseFakeTimers) {
879 return fake_time++;
880 } else {
881 FILETIME wt;
882 GetSystemTimeAsFileTime(&wt);
883 return windows_to_java_time(wt);
884 }
885 }
886
887 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
888 FILETIME wt;
889 GetSystemTimeAsFileTime(&wt);
890 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
891 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
892 seconds = secs;
893 nanos = jlong(ticks - (secs*10000000)) * 100;
894 }
895
896 jlong os::javaTimeNanos() {
897 if (!win32::_has_performance_count) {
898 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
899 } else {
900 LARGE_INTEGER current_count;
901 QueryPerformanceCounter(¤t_count);
902 double current = as_long(current_count);
903 double freq = performance_frequency;
904 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
905 return time;
906 }
907 }
908
909 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
910 if (!win32::_has_performance_count) {
911 // javaTimeMillis() doesn't have much percision,
912 // but it is not going to wrap -- so all 64 bits
913 info_ptr->max_value = ALL_64_BITS;
914
915 // this is a wall clock timer, so may skip
916 info_ptr->may_skip_backward = true;
917 info_ptr->may_skip_forward = true;
918 } else {
919 jlong freq = performance_frequency;
920 if (freq < NANOSECS_PER_SEC) {
921 // the performance counter is 64 bits and we will
922 // be multiplying it -- so no wrap in 64 bits
923 info_ptr->max_value = ALL_64_BITS;
924 } else if (freq > NANOSECS_PER_SEC) {
925 // use the max value the counter can reach to
926 // determine the max value which could be returned
927 julong max_counter = (julong)ALL_64_BITS;
928 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
929 } else {
930 // the performance counter is 64 bits and we will
931 // be using it directly -- so no wrap in 64 bits
932 info_ptr->max_value = ALL_64_BITS;
933 }
934
935 // using a counter, so no skipping
936 info_ptr->may_skip_backward = false;
937 info_ptr->may_skip_forward = false;
938 }
939 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
940 }
941
942 char* os::local_time_string(char *buf, size_t buflen) {
943 SYSTEMTIME st;
944 GetLocalTime(&st);
945 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
946 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
947 return buf;
948 }
949
950 bool os::getTimesSecs(double* process_real_time,
951 double* process_user_time,
952 double* process_system_time) {
953 HANDLE h_process = GetCurrentProcess();
954 FILETIME create_time, exit_time, kernel_time, user_time;
955 BOOL result = GetProcessTimes(h_process,
956 &create_time,
957 &exit_time,
958 &kernel_time,
959 &user_time);
960 if (result != 0) {
961 FILETIME wt;
962 GetSystemTimeAsFileTime(&wt);
963 jlong rtc_millis = windows_to_java_time(wt);
964 jlong user_millis = windows_to_java_time(user_time);
965 jlong system_millis = windows_to_java_time(kernel_time);
966 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
967 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
968 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
969 return true;
970 } else {
971 return false;
972 }
973 }
974
975 void os::shutdown() {
976 // allow PerfMemory to attempt cleanup of any persistent resources
977 perfMemory_exit();
978
979 // flush buffered output, finish log files
980 ostream_abort();
981
982 // Check for abort hook
983 abort_hook_t abort_hook = Arguments::abort_hook();
984 if (abort_hook != NULL) {
985 abort_hook();
986 }
987 }
988
989
990 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
991 PMINIDUMP_EXCEPTION_INFORMATION,
992 PMINIDUMP_USER_STREAM_INFORMATION,
993 PMINIDUMP_CALLBACK_INFORMATION);
994
995 static HANDLE dumpFile = NULL;
996
997 // Check if dump file can be created.
998 void os::check_dump_limit(char* buffer, size_t buffsz) {
999 bool status = true;
1000 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1001 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1002 status = false;
1003 }
1004
1005 #ifndef ASSERT
1006 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1007 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1008 status = false;
1009 }
1010 #endif
1011
1012 if (status) {
1013 const char* cwd = get_current_directory(NULL, 0);
1014 int pid = current_process_id();
1015 if (cwd != NULL) {
1016 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1017 } else {
1018 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1019 }
1020
1021 if (dumpFile == NULL &&
1022 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1023 == INVALID_HANDLE_VALUE) {
1024 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1025 status = false;
1026 }
1027 }
1028 VMError::record_coredump_status(buffer, status);
1029 }
1030
1031 void os::abort(bool dump_core, void* siginfo, void* context) {
1032 HINSTANCE dbghelp;
1033 EXCEPTION_POINTERS ep;
1034 MINIDUMP_EXCEPTION_INFORMATION mei;
1035 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1036
1037 HANDLE hProcess = GetCurrentProcess();
1038 DWORD processId = GetCurrentProcessId();
1039 MINIDUMP_TYPE dumpType;
1040
1041 shutdown();
1042 if (!dump_core || dumpFile == NULL) {
1043 if (dumpFile != NULL) {
1044 CloseHandle(dumpFile);
1045 }
1046 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1047 }
1048
1049 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1050
1051 if (dbghelp == NULL) {
1052 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1053 CloseHandle(dumpFile);
1054 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1055 }
1056
1057 _MiniDumpWriteDump =
1058 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1059 PMINIDUMP_EXCEPTION_INFORMATION,
1060 PMINIDUMP_USER_STREAM_INFORMATION,
1061 PMINIDUMP_CALLBACK_INFORMATION),
1062 GetProcAddress(dbghelp,
1063 "MiniDumpWriteDump"));
1064
1065 if (_MiniDumpWriteDump == NULL) {
1066 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1067 CloseHandle(dumpFile);
1068 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1069 }
1070
1071 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1072
1073 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1074 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1075 #if API_VERSION_NUMBER >= 11
1076 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1077 MiniDumpWithUnloadedModules);
1078 #endif
1079
1080 if (siginfo != NULL && context != NULL) {
1081 ep.ContextRecord = (PCONTEXT) context;
1082 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1083
1084 mei.ThreadId = GetCurrentThreadId();
1085 mei.ExceptionPointers = &ep;
1086 pmei = &mei;
1087 } else {
1088 pmei = NULL;
1089 }
1090
1091 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1092 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1093 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1094 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1095 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1096 }
1097 CloseHandle(dumpFile);
1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1099 }
1100
1101 // Die immediately, no exit hook, no abort hook, no cleanup.
1102 void os::die() {
1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1104 }
1105
1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1107 // * dirent_md.c 1.15 00/02/02
1108 //
1109 // The declarations for DIR and struct dirent are in jvm_win32.h.
1110
1111 // Caller must have already run dirname through JVM_NativePath, which removes
1112 // duplicate slashes and converts all instances of '/' into '\\'.
1113
1114 DIR * os::opendir(const char *dirname) {
1115 assert(dirname != NULL, "just checking"); // hotspot change
1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1117 DWORD fattr; // hotspot change
1118 char alt_dirname[4] = { 0, 0, 0, 0 };
1119
1120 if (dirp == 0) {
1121 errno = ENOMEM;
1122 return 0;
1123 }
1124
1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1126 // as a directory in FindFirstFile(). We detect this case here and
1127 // prepend the current drive name.
1128 //
1129 if (dirname[1] == '\0' && dirname[0] == '\\') {
1130 alt_dirname[0] = _getdrive() + 'A' - 1;
1131 alt_dirname[1] = ':';
1132 alt_dirname[2] = '\\';
1133 alt_dirname[3] = '\0';
1134 dirname = alt_dirname;
1135 }
1136
1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1138 if (dirp->path == 0) {
1139 free(dirp);
1140 errno = ENOMEM;
1141 return 0;
1142 }
1143 strcpy(dirp->path, dirname);
1144
1145 fattr = GetFileAttributes(dirp->path);
1146 if (fattr == 0xffffffff) {
1147 free(dirp->path);
1148 free(dirp);
1149 errno = ENOENT;
1150 return 0;
1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1152 free(dirp->path);
1153 free(dirp);
1154 errno = ENOTDIR;
1155 return 0;
1156 }
1157
1158 // Append "*.*", or possibly "\\*.*", to path
1159 if (dirp->path[1] == ':' &&
1160 (dirp->path[2] == '\0' ||
1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1162 // No '\\' needed for cases like "Z:" or "Z:\"
1163 strcat(dirp->path, "*.*");
1164 } else {
1165 strcat(dirp->path, "\\*.*");
1166 }
1167
1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1169 if (dirp->handle == INVALID_HANDLE_VALUE) {
1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1171 free(dirp->path);
1172 free(dirp);
1173 errno = EACCES;
1174 return 0;
1175 }
1176 }
1177 return dirp;
1178 }
1179
1180 // parameter dbuf unused on Windows
1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1182 assert(dirp != NULL, "just checking"); // hotspot change
1183 if (dirp->handle == INVALID_HANDLE_VALUE) {
1184 return 0;
1185 }
1186
1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1188
1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1190 if (GetLastError() == ERROR_INVALID_HANDLE) {
1191 errno = EBADF;
1192 return 0;
1193 }
1194 FindClose(dirp->handle);
1195 dirp->handle = INVALID_HANDLE_VALUE;
1196 }
1197
1198 return &dirp->dirent;
1199 }
1200
1201 int os::closedir(DIR *dirp) {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path);
1211 free(dirp);
1212 return 0;
1213 }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1220 return path_buf;
1221 } else {
1222 path_buf[0] = '\0';
1223 return path_buf;
1224 }
1225 }
1226
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1233
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1239
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1244
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0; i < n; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0; i < n; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i]);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1290
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1298
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll(address addr) {
1306 HMODULE hmod;
1307 MODULEINFO minfo;
1308
1309 hmod = GetModuleHandle("NTDLL.DLL");
1310 if (hmod == NULL) return false;
1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1312 &minfo, sizeof(MODULEINFO))) {
1313 return false;
1314 }
1315
1316 if ((addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1318 return true;
1319 } else {
1320 return false;
1321 }
1322 }
1323 #endif
1324
1325 struct _modinfo {
1326 address addr;
1327 char* full_path; // point to a char buffer
1328 int buflen; // size of the buffer
1329 address base_addr;
1330 };
1331
1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 struct _modinfo *pmod = (struct _modinfo *)param;
1335 if (!pmod) return -1;
1336
1337 if (base_addr <= pmod->addr &&
1338 top_address > pmod->addr) {
1339 // if a buffer is provided, copy path name to the buffer
1340 if (pmod->full_path) {
1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1342 }
1343 pmod->base_addr = base_addr;
1344 return 1;
1345 }
1346 return 0;
1347 }
1348
1349 bool os::dll_address_to_library_name(address addr, char* buf,
1350 int buflen, int* offset) {
1351 // buf is not optional, but offset is optional
1352 assert(buf != NULL, "sanity check");
1353
1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1355 // return the full path to the DLL file, sometimes it returns path
1356 // to the corresponding PDB file (debug info); sometimes it only
1357 // returns partial path, which makes life painful.
1358
1359 struct _modinfo mi;
1360 mi.addr = addr;
1361 mi.full_path = buf;
1362 mi.buflen = buflen;
1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1364 // buf already contains path name
1365 if (offset) *offset = addr - mi.base_addr;
1366 return true;
1367 }
1368
1369 buf[0] = '\0';
1370 if (offset) *offset = -1;
1371 return false;
1372 }
1373
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375 int buflen, int *offset,
1376 bool demangle) {
1377 // buf is not optional, but offset is optional
1378 assert(buf != NULL, "sanity check");
1379
1380 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1381 return true;
1382 }
1383 if (offset != NULL) *offset = -1;
1384 buf[0] = '\0';
1385 return false;
1386 }
1387
1388 // save the start and end address of jvm.dll into param[0] and param[1]
1389 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1390 address top_address, void * param) {
1391 if (!param) return -1;
1392
1393 if (base_addr <= (address)_locate_jvm_dll &&
1394 top_address > (address)_locate_jvm_dll) {
1395 ((address*)param)[0] = base_addr;
1396 ((address*)param)[1] = top_address;
1397 return 1;
1398 }
1399 return 0;
1400 }
1401
1402 address vm_lib_location[2]; // start and end address of jvm.dll
1403
1404 // check if addr is inside jvm.dll
1405 bool os::address_is_in_vm(address addr) {
1406 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1407 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1408 assert(false, "Can't find jvm module.");
1409 return false;
1410 }
1411 }
1412
1413 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1414 }
1415
1416 // print module info; param is outputStream*
1417 static int _print_module(const char* fname, address base_address,
1418 address top_address, void* param) {
1419 if (!param) return -1;
1420
1421 outputStream* st = (outputStream*)param;
1422
1423 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1424 return 0;
1425 }
1426
1427 // Loads .dll/.so and
1428 // in case of error it checks if .dll/.so was built for the
1429 // same architecture as Hotspot is running on
1430 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1431 void * result = LoadLibrary(name);
1432 if (result != NULL) {
1433 return result;
1434 }
1435
1436 DWORD errcode = GetLastError();
1437 if (errcode == ERROR_MOD_NOT_FOUND) {
1438 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1439 ebuf[ebuflen - 1] = '\0';
1440 return NULL;
1441 }
1442
1443 // Parsing dll below
1444 // If we can read dll-info and find that dll was built
1445 // for an architecture other than Hotspot is running in
1446 // - then print to buffer "DLL was built for a different architecture"
1447 // else call os::lasterror to obtain system error message
1448
1449 // Read system error message into ebuf
1450 // It may or may not be overwritten below (in the for loop and just above)
1451 lasterror(ebuf, (size_t) ebuflen);
1452 ebuf[ebuflen - 1] = '\0';
1453 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1454 if (fd < 0) {
1455 return NULL;
1456 }
1457
1458 uint32_t signature_offset;
1459 uint16_t lib_arch = 0;
1460 bool failed_to_get_lib_arch =
1461 ( // Go to position 3c in the dll
1462 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1463 ||
1464 // Read location of signature
1465 (sizeof(signature_offset) !=
1466 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1467 ||
1468 // Go to COFF File Header in dll
1469 // that is located after "signature" (4 bytes long)
1470 (os::seek_to_file_offset(fd,
1471 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1472 ||
1473 // Read field that contains code of architecture
1474 // that dll was built for
1475 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1476 );
1477
1478 ::close(fd);
1479 if (failed_to_get_lib_arch) {
1480 // file i/o error - report os::lasterror(...) msg
1481 return NULL;
1482 }
1483
1484 typedef struct {
1485 uint16_t arch_code;
1486 char* arch_name;
1487 } arch_t;
1488
1489 static const arch_t arch_array[] = {
1490 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1491 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1492 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1493 };
1494 #if (defined _M_IA64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1496 #elif (defined _M_AMD64)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1498 #elif (defined _M_IX86)
1499 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1500 #else
1501 #error Method os::dll_load requires that one of following \
1502 is defined :_M_IA64,_M_AMD64 or _M_IX86
1503 #endif
1504
1505
1506 // Obtain a string for printf operation
1507 // lib_arch_str shall contain string what platform this .dll was built for
1508 // running_arch_str shall string contain what platform Hotspot was built for
1509 char *running_arch_str = NULL, *lib_arch_str = NULL;
1510 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1511 if (lib_arch == arch_array[i].arch_code) {
1512 lib_arch_str = arch_array[i].arch_name;
1513 }
1514 if (running_arch == arch_array[i].arch_code) {
1515 running_arch_str = arch_array[i].arch_name;
1516 }
1517 }
1518
1519 assert(running_arch_str,
1520 "Didn't find running architecture code in arch_array");
1521
1522 // If the architecture is right
1523 // but some other error took place - report os::lasterror(...) msg
1524 if (lib_arch == running_arch) {
1525 return NULL;
1526 }
1527
1528 if (lib_arch_str != NULL) {
1529 ::_snprintf(ebuf, ebuflen - 1,
1530 "Can't load %s-bit .dll on a %s-bit platform",
1531 lib_arch_str, running_arch_str);
1532 } else {
1533 // don't know what architecture this dll was build for
1534 ::_snprintf(ebuf, ebuflen - 1,
1535 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1536 lib_arch, running_arch_str);
1537 }
1538
1539 return NULL;
1540 }
1541
1542 void os::print_dll_info(outputStream *st) {
1543 st->print_cr("Dynamic libraries:");
1544 get_loaded_modules_info(_print_module, (void *)st);
1545 }
1546
1547 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1548 HANDLE hProcess;
1549
1550 # define MAX_NUM_MODULES 128
1551 HMODULE modules[MAX_NUM_MODULES];
1552 static char filename[MAX_PATH];
1553 int result = 0;
1554
1555 if (!os::PSApiDll::PSApiAvailable()) {
1556 return 0;
1557 }
1558
1559 int pid = os::current_process_id();
1560 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1561 FALSE, pid);
1562 if (hProcess == NULL) return 0;
1563
1564 DWORD size_needed;
1565 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1566 sizeof(modules), &size_needed)) {
1567 CloseHandle(hProcess);
1568 return 0;
1569 }
1570
1571 // number of modules that are currently loaded
1572 int num_modules = size_needed / sizeof(HMODULE);
1573
1574 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1575 // Get Full pathname:
1576 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1577 filename, sizeof(filename))) {
1578 filename[0] = '\0';
1579 }
1580
1581 MODULEINFO modinfo;
1582 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1583 &modinfo, sizeof(modinfo))) {
1584 modinfo.lpBaseOfDll = NULL;
1585 modinfo.SizeOfImage = 0;
1586 }
1587
1588 // Invoke callback function
1589 result = callback(filename, (address)modinfo.lpBaseOfDll,
1590 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1591 if (result) break;
1592 }
1593
1594 CloseHandle(hProcess);
1595 return result;
1596 }
1597
1598 #ifndef PRODUCT
1599 bool os::get_host_name(char* buf, size_t buflen) {
1600 DWORD size = (DWORD)buflen;
1601 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1602 }
1603 #endif // PRODUCT
1604
1605 void os::get_summary_os_info(char* buf, size_t buflen) {
1606 stringStream sst(buf, buflen);
1607 os::win32::print_windows_version(&sst);
1608 // chop off newline character
1609 char* nl = strchr(buf, '\n');
1610 if (nl != NULL) *nl = '\0';
1611 }
1612
1613 void os::print_os_info_brief(outputStream* st) {
1614 os::print_os_info(st);
1615 }
1616
1617 void os::print_os_info(outputStream* st) {
1618 #ifdef ASSERT
1619 char buffer[1024];
1620 st->print("HostName: ");
1621 if (get_host_name(buffer, sizeof(buffer))) {
1622 st->print("%s ", buffer);
1623 } else {
1624 st->print("N/A ");
1625 }
1626 #endif
1627 st->print("OS:");
1628 os::win32::print_windows_version(st);
1629 }
1630
1631 void os::win32::print_windows_version(outputStream* st) {
1632 OSVERSIONINFOEX osvi;
1633 VS_FIXEDFILEINFO *file_info;
1634 TCHAR kernel32_path[MAX_PATH];
1635 UINT len, ret;
1636
1637 // Use the GetVersionEx information to see if we're on a server or
1638 // workstation edition of Windows. Starting with Windows 8.1 we can't
1639 // trust the OS version information returned by this API.
1640 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1641 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1642 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1643 st->print_cr("Call to GetVersionEx failed");
1644 return;
1645 }
1646 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1647
1648 // Get the full path to \Windows\System32\kernel32.dll and use that for
1649 // determining what version of Windows we're running on.
1650 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1651 ret = GetSystemDirectory(kernel32_path, len);
1652 if (ret == 0 || ret > len) {
1653 st->print_cr("Call to GetSystemDirectory failed");
1654 return;
1655 }
1656 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1657
1658 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1659 if (version_size == 0) {
1660 st->print_cr("Call to GetFileVersionInfoSize failed");
1661 return;
1662 }
1663
1664 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1665 if (version_info == NULL) {
1666 st->print_cr("Failed to allocate version_info");
1667 return;
1668 }
1669
1670 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1671 os::free(version_info);
1672 st->print_cr("Call to GetFileVersionInfo failed");
1673 return;
1674 }
1675
1676 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1677 os::free(version_info);
1678 st->print_cr("Call to VerQueryValue failed");
1679 return;
1680 }
1681
1682 int major_version = HIWORD(file_info->dwProductVersionMS);
1683 int minor_version = LOWORD(file_info->dwProductVersionMS);
1684 int build_number = HIWORD(file_info->dwProductVersionLS);
1685 int build_minor = LOWORD(file_info->dwProductVersionLS);
1686 int os_vers = major_version * 1000 + minor_version;
1687 os::free(version_info);
1688
1689 st->print(" Windows ");
1690 switch (os_vers) {
1691
1692 case 6000:
1693 if (is_workstation) {
1694 st->print("Vista");
1695 } else {
1696 st->print("Server 2008");
1697 }
1698 break;
1699
1700 case 6001:
1701 if (is_workstation) {
1702 st->print("7");
1703 } else {
1704 st->print("Server 2008 R2");
1705 }
1706 break;
1707
1708 case 6002:
1709 if (is_workstation) {
1710 st->print("8");
1711 } else {
1712 st->print("Server 2012");
1713 }
1714 break;
1715
1716 case 6003:
1717 if (is_workstation) {
1718 st->print("8.1");
1719 } else {
1720 st->print("Server 2012 R2");
1721 }
1722 break;
1723
1724 case 10000:
1725 if (is_workstation) {
1726 st->print("10");
1727 } else {
1728 // The server version name of Windows 10 is not known at this time
1729 st->print("%d.%d", major_version, minor_version);
1730 }
1731 break;
1732
1733 default:
1734 // Unrecognized windows, print out its major and minor versions
1735 st->print("%d.%d", major_version, minor_version);
1736 break;
1737 }
1738
1739 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1740 // find out whether we are running on 64 bit processor or not
1741 SYSTEM_INFO si;
1742 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1743 os::Kernel32Dll::GetNativeSystemInfo(&si);
1744 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1745 st->print(" , 64 bit");
1746 }
1747
1748 st->print(" Build %d", build_number);
1749 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1750 st->cr();
1751 }
1752
1753 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1754 // Nothing to do for now.
1755 }
1756
1757 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1758 HKEY key;
1759 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1760 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1761 if (status == ERROR_SUCCESS) {
1762 DWORD size = (DWORD)buflen;
1763 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1764 if (status != ERROR_SUCCESS) {
1765 strncpy(buf, "## __CPU__", buflen);
1766 }
1767 RegCloseKey(key);
1768 } else {
1769 // Put generic cpu info to return
1770 strncpy(buf, "## __CPU__", buflen);
1771 }
1772 }
1773
1774 void os::print_memory_info(outputStream* st) {
1775 st->print("Memory:");
1776 st->print(" %dk page", os::vm_page_size()>>10);
1777
1778 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1779 // value if total memory is larger than 4GB
1780 MEMORYSTATUSEX ms;
1781 ms.dwLength = sizeof(ms);
1782 GlobalMemoryStatusEx(&ms);
1783
1784 st->print(", physical %uk", os::physical_memory() >> 10);
1785 st->print("(%uk free)", os::available_memory() >> 10);
1786
1787 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1788 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1789 st->cr();
1790 }
1791
1792 void os::print_siginfo(outputStream *st, void *siginfo) {
1793 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1794 st->print("siginfo:");
1795 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1796
1797 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1798 er->NumberParameters >= 2) {
1799 switch (er->ExceptionInformation[0]) {
1800 case 0: st->print(", reading address"); break;
1801 case 1: st->print(", writing address"); break;
1802 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1803 er->ExceptionInformation[0]);
1804 }
1805 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1806 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1807 er->NumberParameters >= 2 && UseSharedSpaces) {
1808 FileMapInfo* mapinfo = FileMapInfo::current_info();
1809 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1810 st->print("\n\nError accessing class data sharing archive." \
1811 " Mapped file inaccessible during execution, " \
1812 " possible disk/network problem.");
1813 }
1814 } else {
1815 int num = er->NumberParameters;
1816 if (num > 0) {
1817 st->print(", ExceptionInformation=");
1818 for (int i = 0; i < num; i++) {
1819 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1820 }
1821 }
1822 }
1823 st->cr();
1824 }
1825
1826 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1827 // do nothing
1828 }
1829
1830 static char saved_jvm_path[MAX_PATH] = {0};
1831
1832 // Find the full path to the current module, jvm.dll
1833 void os::jvm_path(char *buf, jint buflen) {
1834 // Error checking.
1835 if (buflen < MAX_PATH) {
1836 assert(false, "must use a large-enough buffer");
1837 buf[0] = '\0';
1838 return;
1839 }
1840 // Lazy resolve the path to current module.
1841 if (saved_jvm_path[0] != 0) {
1842 strcpy(buf, saved_jvm_path);
1843 return;
1844 }
1845
1846 buf[0] = '\0';
1847 if (Arguments::sun_java_launcher_is_altjvm()) {
1848 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1849 // for a JAVA_HOME environment variable and fix up the path so it
1850 // looks like jvm.dll is installed there (append a fake suffix
1851 // hotspot/jvm.dll).
1852 char* java_home_var = ::getenv("JAVA_HOME");
1853 if (java_home_var != NULL && java_home_var[0] != 0 &&
1854 strlen(java_home_var) < (size_t)buflen) {
1855 strncpy(buf, java_home_var, buflen);
1856
1857 // determine if this is a legacy image or modules image
1858 // modules image doesn't have "jre" subdirectory
1859 size_t len = strlen(buf);
1860 char* jrebin_p = buf + len;
1861 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1862 if (0 != _access(buf, 0)) {
1863 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1864 }
1865 len = strlen(buf);
1866 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1867 }
1868 }
1869
1870 if (buf[0] == '\0') {
1871 GetModuleFileName(vm_lib_handle, buf, buflen);
1872 }
1873 strncpy(saved_jvm_path, buf, MAX_PATH);
1874 saved_jvm_path[MAX_PATH - 1] = '\0';
1875 }
1876
1877
1878 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1879 #ifndef _WIN64
1880 st->print("_");
1881 #endif
1882 }
1883
1884
1885 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1886 #ifndef _WIN64
1887 st->print("@%d", args_size * sizeof(int));
1888 #endif
1889 }
1890
1891 // This method is a copy of JDK's sysGetLastErrorString
1892 // from src/windows/hpi/src/system_md.c
1893
1894 size_t os::lasterror(char* buf, size_t len) {
1895 DWORD errval;
1896
1897 if ((errval = GetLastError()) != 0) {
1898 // DOS error
1899 size_t n = (size_t)FormatMessage(
1900 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1901 NULL,
1902 errval,
1903 0,
1904 buf,
1905 (DWORD)len,
1906 NULL);
1907 if (n > 3) {
1908 // Drop final '.', CR, LF
1909 if (buf[n - 1] == '\n') n--;
1910 if (buf[n - 1] == '\r') n--;
1911 if (buf[n - 1] == '.') n--;
1912 buf[n] = '\0';
1913 }
1914 return n;
1915 }
1916
1917 if (errno != 0) {
1918 // C runtime error that has no corresponding DOS error code
1919 const char* s = strerror(errno);
1920 size_t n = strlen(s);
1921 if (n >= len) n = len - 1;
1922 strncpy(buf, s, n);
1923 buf[n] = '\0';
1924 return n;
1925 }
1926
1927 return 0;
1928 }
1929
1930 int os::get_last_error() {
1931 DWORD error = GetLastError();
1932 if (error == 0) {
1933 error = errno;
1934 }
1935 return (int)error;
1936 }
1937
1938 WindowsSemaphore::WindowsSemaphore(uint value) {
1939 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1940
1941 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1942 }
1943
1944 WindowsSemaphore::~WindowsSemaphore() {
1945 ::CloseHandle(_semaphore);
1946 }
1947
1948 void WindowsSemaphore::signal(uint count) {
1949 if (count > 0) {
1950 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1951
1952 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1953 }
1954 }
1955
1956 void WindowsSemaphore::wait() {
1957 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1958 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1959 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1960 }
1961
1962 // sun.misc.Signal
1963 // NOTE that this is a workaround for an apparent kernel bug where if
1964 // a signal handler for SIGBREAK is installed then that signal handler
1965 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1966 // See bug 4416763.
1967 static void (*sigbreakHandler)(int) = NULL;
1968
1969 static void UserHandler(int sig, void *siginfo, void *context) {
1970 os::signal_notify(sig);
1971 // We need to reinstate the signal handler each time...
1972 os::signal(sig, (void*)UserHandler);
1973 }
1974
1975 void* os::user_handler() {
1976 return (void*) UserHandler;
1977 }
1978
1979 void* os::signal(int signal_number, void* handler) {
1980 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1981 void (*oldHandler)(int) = sigbreakHandler;
1982 sigbreakHandler = (void (*)(int)) handler;
1983 return (void*) oldHandler;
1984 } else {
1985 return (void*)::signal(signal_number, (void (*)(int))handler);
1986 }
1987 }
1988
1989 void os::signal_raise(int signal_number) {
1990 raise(signal_number);
1991 }
1992
1993 // The Win32 C runtime library maps all console control events other than ^C
1994 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1995 // logoff, and shutdown events. We therefore install our own console handler
1996 // that raises SIGTERM for the latter cases.
1997 //
1998 static BOOL WINAPI consoleHandler(DWORD event) {
1999 switch (event) {
2000 case CTRL_C_EVENT:
2001 if (is_error_reported()) {
2002 // Ctrl-C is pressed during error reporting, likely because the error
2003 // handler fails to abort. Let VM die immediately.
2004 os::die();
2005 }
2006
2007 os::signal_raise(SIGINT);
2008 return TRUE;
2009 break;
2010 case CTRL_BREAK_EVENT:
2011 if (sigbreakHandler != NULL) {
2012 (*sigbreakHandler)(SIGBREAK);
2013 }
2014 return TRUE;
2015 break;
2016 case CTRL_LOGOFF_EVENT: {
2017 // Don't terminate JVM if it is running in a non-interactive session,
2018 // such as a service process.
2019 USEROBJECTFLAGS flags;
2020 HANDLE handle = GetProcessWindowStation();
2021 if (handle != NULL &&
2022 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2023 sizeof(USEROBJECTFLAGS), NULL)) {
2024 // If it is a non-interactive session, let next handler to deal
2025 // with it.
2026 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2027 return FALSE;
2028 }
2029 }
2030 }
2031 case CTRL_CLOSE_EVENT:
2032 case CTRL_SHUTDOWN_EVENT:
2033 os::signal_raise(SIGTERM);
2034 return TRUE;
2035 break;
2036 default:
2037 break;
2038 }
2039 return FALSE;
2040 }
2041
2042 // The following code is moved from os.cpp for making this
2043 // code platform specific, which it is by its very nature.
2044
2045 // Return maximum OS signal used + 1 for internal use only
2046 // Used as exit signal for signal_thread
2047 int os::sigexitnum_pd() {
2048 return NSIG;
2049 }
2050
2051 // a counter for each possible signal value, including signal_thread exit signal
2052 static volatile jint pending_signals[NSIG+1] = { 0 };
2053 static HANDLE sig_sem = NULL;
2054
2055 void os::signal_init_pd() {
2056 // Initialize signal structures
2057 memset((void*)pending_signals, 0, sizeof(pending_signals));
2058
2059 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2060
2061 // Programs embedding the VM do not want it to attempt to receive
2062 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2063 // shutdown hooks mechanism introduced in 1.3. For example, when
2064 // the VM is run as part of a Windows NT service (i.e., a servlet
2065 // engine in a web server), the correct behavior is for any console
2066 // control handler to return FALSE, not TRUE, because the OS's
2067 // "final" handler for such events allows the process to continue if
2068 // it is a service (while terminating it if it is not a service).
2069 // To make this behavior uniform and the mechanism simpler, we
2070 // completely disable the VM's usage of these console events if -Xrs
2071 // (=ReduceSignalUsage) is specified. This means, for example, that
2072 // the CTRL-BREAK thread dump mechanism is also disabled in this
2073 // case. See bugs 4323062, 4345157, and related bugs.
2074
2075 if (!ReduceSignalUsage) {
2076 // Add a CTRL-C handler
2077 SetConsoleCtrlHandler(consoleHandler, TRUE);
2078 }
2079 }
2080
2081 void os::signal_notify(int signal_number) {
2082 BOOL ret;
2083 if (sig_sem != NULL) {
2084 Atomic::inc(&pending_signals[signal_number]);
2085 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2086 assert(ret != 0, "ReleaseSemaphore() failed");
2087 }
2088 }
2089
2090 static int check_pending_signals(bool wait_for_signal) {
2091 DWORD ret;
2092 while (true) {
2093 for (int i = 0; i < NSIG + 1; i++) {
2094 jint n = pending_signals[i];
2095 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2096 return i;
2097 }
2098 }
2099 if (!wait_for_signal) {
2100 return -1;
2101 }
2102
2103 JavaThread *thread = JavaThread::current();
2104
2105 ThreadBlockInVM tbivm(thread);
2106
2107 bool threadIsSuspended;
2108 do {
2109 thread->set_suspend_equivalent();
2110 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2111 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2112 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2113
2114 // were we externally suspended while we were waiting?
2115 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2116 if (threadIsSuspended) {
2117 // The semaphore has been incremented, but while we were waiting
2118 // another thread suspended us. We don't want to continue running
2119 // while suspended because that would surprise the thread that
2120 // suspended us.
2121 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2122 assert(ret != 0, "ReleaseSemaphore() failed");
2123
2124 thread->java_suspend_self();
2125 }
2126 } while (threadIsSuspended);
2127 }
2128 }
2129
2130 int os::signal_lookup() {
2131 return check_pending_signals(false);
2132 }
2133
2134 int os::signal_wait() {
2135 return check_pending_signals(true);
2136 }
2137
2138 // Implicit OS exception handling
2139
2140 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2141 address handler) {
2142 JavaThread* thread = JavaThread::current();
2143 // Save pc in thread
2144 #ifdef _M_IA64
2145 // Do not blow up if no thread info available.
2146 if (thread) {
2147 // Saving PRECISE pc (with slot information) in thread.
2148 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2149 // Convert precise PC into "Unix" format
2150 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2151 thread->set_saved_exception_pc((address)precise_pc);
2152 }
2153 // Set pc to handler
2154 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2155 // Clear out psr.ri (= Restart Instruction) in order to continue
2156 // at the beginning of the target bundle.
2157 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2158 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2159 #else
2160 #ifdef _M_AMD64
2161 // Do not blow up if no thread info available.
2162 if (thread) {
2163 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2164 }
2165 // Set pc to handler
2166 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2167 #else
2168 // Do not blow up if no thread info available.
2169 if (thread) {
2170 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2171 }
2172 // Set pc to handler
2173 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2174 #endif
2175 #endif
2176
2177 // Continue the execution
2178 return EXCEPTION_CONTINUE_EXECUTION;
2179 }
2180
2181
2182 // Used for PostMortemDump
2183 extern "C" void safepoints();
2184 extern "C" void find(int x);
2185 extern "C" void events();
2186
2187 // According to Windows API documentation, an illegal instruction sequence should generate
2188 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2189 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2190 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2191
2192 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2193
2194 // From "Execution Protection in the Windows Operating System" draft 0.35
2195 // Once a system header becomes available, the "real" define should be
2196 // included or copied here.
2197 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2198
2199 // Handle NAT Bit consumption on IA64.
2200 #ifdef _M_IA64
2201 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2202 #endif
2203
2204 // Windows Vista/2008 heap corruption check
2205 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2206
2207 #define def_excpt(val) #val, val
2208
2209 struct siglabel {
2210 char *name;
2211 int number;
2212 };
2213
2214 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2215 // C++ compiler contain this error code. Because this is a compiler-generated
2216 // error, the code is not listed in the Win32 API header files.
2217 // The code is actually a cryptic mnemonic device, with the initial "E"
2218 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2219 // ASCII values of "msc".
2220
2221 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2222
2223
2224 struct siglabel exceptlabels[] = {
2225 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2226 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2227 def_excpt(EXCEPTION_BREAKPOINT),
2228 def_excpt(EXCEPTION_SINGLE_STEP),
2229 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2230 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2231 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2232 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2233 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2234 def_excpt(EXCEPTION_FLT_OVERFLOW),
2235 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2236 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2237 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2238 def_excpt(EXCEPTION_INT_OVERFLOW),
2239 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2240 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2241 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2242 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2243 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2244 def_excpt(EXCEPTION_STACK_OVERFLOW),
2245 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2246 def_excpt(EXCEPTION_GUARD_PAGE),
2247 def_excpt(EXCEPTION_INVALID_HANDLE),
2248 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2249 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2250 #ifdef _M_IA64
2251 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2252 #endif
2253 NULL, 0
2254 };
2255
2256 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2257 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2258 if (exceptlabels[i].number == exception_code) {
2259 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2260 return buf;
2261 }
2262 }
2263
2264 return NULL;
2265 }
2266
2267 //-----------------------------------------------------------------------------
2268 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2269 // handle exception caused by idiv; should only happen for -MinInt/-1
2270 // (division by zero is handled explicitly)
2271 #ifdef _M_IA64
2272 assert(0, "Fix Handle_IDiv_Exception");
2273 #else
2274 #ifdef _M_AMD64
2275 PCONTEXT ctx = exceptionInfo->ContextRecord;
2276 address pc = (address)ctx->Rip;
2277 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2278 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2279 if (pc[0] == 0xF7) {
2280 // set correct result values and continue after idiv instruction
2281 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2282 } else {
2283 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2284 }
2285 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2286 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2287 // idiv opcode (0xF7).
2288 ctx->Rdx = (DWORD)0; // remainder
2289 // Continue the execution
2290 #else
2291 PCONTEXT ctx = exceptionInfo->ContextRecord;
2292 address pc = (address)ctx->Eip;
2293 assert(pc[0] == 0xF7, "not an idiv opcode");
2294 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2295 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2296 // set correct result values and continue after idiv instruction
2297 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2298 ctx->Eax = (DWORD)min_jint; // result
2299 ctx->Edx = (DWORD)0; // remainder
2300 // Continue the execution
2301 #endif
2302 #endif
2303 return EXCEPTION_CONTINUE_EXECUTION;
2304 }
2305
2306 //-----------------------------------------------------------------------------
2307 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2308 PCONTEXT ctx = exceptionInfo->ContextRecord;
2309 #ifndef _WIN64
2310 // handle exception caused by native method modifying control word
2311 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2312
2313 switch (exception_code) {
2314 case EXCEPTION_FLT_DENORMAL_OPERAND:
2315 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2316 case EXCEPTION_FLT_INEXACT_RESULT:
2317 case EXCEPTION_FLT_INVALID_OPERATION:
2318 case EXCEPTION_FLT_OVERFLOW:
2319 case EXCEPTION_FLT_STACK_CHECK:
2320 case EXCEPTION_FLT_UNDERFLOW:
2321 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2322 if (fp_control_word != ctx->FloatSave.ControlWord) {
2323 // Restore FPCW and mask out FLT exceptions
2324 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2325 // Mask out pending FLT exceptions
2326 ctx->FloatSave.StatusWord &= 0xffffff00;
2327 return EXCEPTION_CONTINUE_EXECUTION;
2328 }
2329 }
2330
2331 if (prev_uef_handler != NULL) {
2332 // We didn't handle this exception so pass it to the previous
2333 // UnhandledExceptionFilter.
2334 return (prev_uef_handler)(exceptionInfo);
2335 }
2336 #else // !_WIN64
2337 // On Windows, the mxcsr control bits are non-volatile across calls
2338 // See also CR 6192333
2339 //
2340 jint MxCsr = INITIAL_MXCSR;
2341 // we can't use StubRoutines::addr_mxcsr_std()
2342 // because in Win64 mxcsr is not saved there
2343 if (MxCsr != ctx->MxCsr) {
2344 ctx->MxCsr = MxCsr;
2345 return EXCEPTION_CONTINUE_EXECUTION;
2346 }
2347 #endif // !_WIN64
2348
2349 return EXCEPTION_CONTINUE_SEARCH;
2350 }
2351
2352 static inline void report_error(Thread* t, DWORD exception_code,
2353 address addr, void* siginfo, void* context) {
2354 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2355
2356 // If UseOsErrorReporting, this will return here and save the error file
2357 // somewhere where we can find it in the minidump.
2358 }
2359
2360 //-----------------------------------------------------------------------------
2361 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2362 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2363 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2364 #ifdef _M_IA64
2365 // On Itanium, we need the "precise pc", which has the slot number coded
2366 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2367 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2368 // Convert the pc to "Unix format", which has the slot number coded
2369 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2370 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2371 // information is saved in the Unix format.
2372 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2373 #else
2374 #ifdef _M_AMD64
2375 address pc = (address) exceptionInfo->ContextRecord->Rip;
2376 #else
2377 address pc = (address) exceptionInfo->ContextRecord->Eip;
2378 #endif
2379 #endif
2380 Thread* t = Thread::current();
2381
2382 // Handle SafeFetch32 and SafeFetchN exceptions.
2383 if (StubRoutines::is_safefetch_fault(pc)) {
2384 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2385 }
2386
2387 #ifndef _WIN64
2388 // Execution protection violation - win32 running on AMD64 only
2389 // Handled first to avoid misdiagnosis as a "normal" access violation;
2390 // This is safe to do because we have a new/unique ExceptionInformation
2391 // code for this condition.
2392 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2393 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2394 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2395 address addr = (address) exceptionRecord->ExceptionInformation[1];
2396
2397 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2398 int page_size = os::vm_page_size();
2399
2400 // Make sure the pc and the faulting address are sane.
2401 //
2402 // If an instruction spans a page boundary, and the page containing
2403 // the beginning of the instruction is executable but the following
2404 // page is not, the pc and the faulting address might be slightly
2405 // different - we still want to unguard the 2nd page in this case.
2406 //
2407 // 15 bytes seems to be a (very) safe value for max instruction size.
2408 bool pc_is_near_addr =
2409 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2410 bool instr_spans_page_boundary =
2411 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2412 (intptr_t) page_size) > 0);
2413
2414 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2415 static volatile address last_addr =
2416 (address) os::non_memory_address_word();
2417
2418 // In conservative mode, don't unguard unless the address is in the VM
2419 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2420 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2421
2422 // Set memory to RWX and retry
2423 address page_start =
2424 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2425 bool res = os::protect_memory((char*) page_start, page_size,
2426 os::MEM_PROT_RWX);
2427
2428 if (PrintMiscellaneous && Verbose) {
2429 char buf[256];
2430 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2431 "at " INTPTR_FORMAT
2432 ", unguarding " INTPTR_FORMAT ": %s", addr,
2433 page_start, (res ? "success" : strerror(errno)));
2434 tty->print_raw_cr(buf);
2435 }
2436
2437 // Set last_addr so if we fault again at the same address, we don't
2438 // end up in an endless loop.
2439 //
2440 // There are two potential complications here. Two threads trapping
2441 // at the same address at the same time could cause one of the
2442 // threads to think it already unguarded, and abort the VM. Likely
2443 // very rare.
2444 //
2445 // The other race involves two threads alternately trapping at
2446 // different addresses and failing to unguard the page, resulting in
2447 // an endless loop. This condition is probably even more unlikely
2448 // than the first.
2449 //
2450 // Although both cases could be avoided by using locks or thread
2451 // local last_addr, these solutions are unnecessary complication:
2452 // this handler is a best-effort safety net, not a complete solution.
2453 // It is disabled by default and should only be used as a workaround
2454 // in case we missed any no-execute-unsafe VM code.
2455
2456 last_addr = addr;
2457
2458 return EXCEPTION_CONTINUE_EXECUTION;
2459 }
2460 }
2461
2462 // Last unguard failed or not unguarding
2463 tty->print_raw_cr("Execution protection violation");
2464 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2465 exceptionInfo->ContextRecord);
2466 return EXCEPTION_CONTINUE_SEARCH;
2467 }
2468 }
2469 #endif // _WIN64
2470
2471 // Check to see if we caught the safepoint code in the
2472 // process of write protecting the memory serialization page.
2473 // It write enables the page immediately after protecting it
2474 // so just return.
2475 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2476 JavaThread* thread = (JavaThread*) t;
2477 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2478 address addr = (address) exceptionRecord->ExceptionInformation[1];
2479 if (os::is_memory_serialize_page(thread, addr)) {
2480 // Block current thread until the memory serialize page permission restored.
2481 os::block_on_serialize_page_trap();
2482 return EXCEPTION_CONTINUE_EXECUTION;
2483 }
2484 }
2485
2486 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2487 VM_Version::is_cpuinfo_segv_addr(pc)) {
2488 // Verify that OS save/restore AVX registers.
2489 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2490 }
2491
2492 if (t != NULL && t->is_Java_thread()) {
2493 JavaThread* thread = (JavaThread*) t;
2494 bool in_java = thread->thread_state() == _thread_in_Java;
2495
2496 // Handle potential stack overflows up front.
2497 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2498 if (os::uses_stack_guard_pages()) {
2499 #ifdef _M_IA64
2500 // Use guard page for register stack.
2501 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2502 address addr = (address) exceptionRecord->ExceptionInformation[1];
2503 // Check for a register stack overflow on Itanium
2504 if (thread->addr_inside_register_stack_red_zone(addr)) {
2505 // Fatal red zone violation happens if the Java program
2506 // catches a StackOverflow error and does so much processing
2507 // that it runs beyond the unprotected yellow guard zone. As
2508 // a result, we are out of here.
2509 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2510 } else if(thread->addr_inside_register_stack(addr)) {
2511 // Disable the yellow zone which sets the state that
2512 // we've got a stack overflow problem.
2513 if (thread->stack_yellow_zone_enabled()) {
2514 thread->disable_stack_yellow_zone();
2515 }
2516 // Give us some room to process the exception.
2517 thread->disable_register_stack_guard();
2518 // Tracing with +Verbose.
2519 if (Verbose) {
2520 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2521 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2522 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2523 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2524 thread->register_stack_base(),
2525 thread->register_stack_base() + thread->stack_size());
2526 }
2527
2528 // Reguard the permanent register stack red zone just to be sure.
2529 // We saw Windows silently disabling this without telling us.
2530 thread->enable_register_stack_red_zone();
2531
2532 return Handle_Exception(exceptionInfo,
2533 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2534 }
2535 #endif
2536 if (thread->stack_yellow_zone_enabled()) {
2537 // Yellow zone violation. The o/s has unprotected the first yellow
2538 // zone page for us. Note: must call disable_stack_yellow_zone to
2539 // update the enabled status, even if the zone contains only one page.
2540 thread->disable_stack_yellow_zone();
2541 // If not in java code, return and hope for the best.
2542 return in_java
2543 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2544 : EXCEPTION_CONTINUE_EXECUTION;
2545 } else {
2546 // Fatal red zone violation.
2547 thread->disable_stack_red_zone();
2548 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2549 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2550 exceptionInfo->ContextRecord);
2551 return EXCEPTION_CONTINUE_SEARCH;
2552 }
2553 } else if (in_java) {
2554 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2555 // a one-time-only guard page, which it has released to us. The next
2556 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2557 return Handle_Exception(exceptionInfo,
2558 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2559 } else {
2560 // Can only return and hope for the best. Further stack growth will
2561 // result in an ACCESS_VIOLATION.
2562 return EXCEPTION_CONTINUE_EXECUTION;
2563 }
2564 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2565 // Either stack overflow or null pointer exception.
2566 if (in_java) {
2567 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2568 address addr = (address) exceptionRecord->ExceptionInformation[1];
2569 address stack_end = thread->stack_base() - thread->stack_size();
2570 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2571 // Stack overflow.
2572 assert(!os::uses_stack_guard_pages(),
2573 "should be caught by red zone code above.");
2574 return Handle_Exception(exceptionInfo,
2575 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2576 }
2577 // Check for safepoint polling and implicit null
2578 // We only expect null pointers in the stubs (vtable)
2579 // the rest are checked explicitly now.
2580 CodeBlob* cb = CodeCache::find_blob(pc);
2581 if (cb != NULL) {
2582 if (os::is_poll_address(addr)) {
2583 address stub = SharedRuntime::get_poll_stub(pc);
2584 return Handle_Exception(exceptionInfo, stub);
2585 }
2586 }
2587 {
2588 #ifdef _WIN64
2589 // If it's a legal stack address map the entire region in
2590 //
2591 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2592 address addr = (address) exceptionRecord->ExceptionInformation[1];
2593 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2594 addr = (address)((uintptr_t)addr &
2595 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2596 os::commit_memory((char *)addr, thread->stack_base() - addr,
2597 !ExecMem);
2598 return EXCEPTION_CONTINUE_EXECUTION;
2599 } else
2600 #endif
2601 {
2602 // Null pointer exception.
2603 #ifdef _M_IA64
2604 // Process implicit null checks in compiled code. Note: Implicit null checks
2605 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2606 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2607 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2608 // Handle implicit null check in UEP method entry
2609 if (cb && (cb->is_frame_complete_at(pc) ||
2610 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2611 if (Verbose) {
2612 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2613 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2614 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2615 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2616 *(bundle_start + 1), *bundle_start);
2617 }
2618 return Handle_Exception(exceptionInfo,
2619 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2620 }
2621 }
2622
2623 // Implicit null checks were processed above. Hence, we should not reach
2624 // here in the usual case => die!
2625 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2626 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2627 exceptionInfo->ContextRecord);
2628 return EXCEPTION_CONTINUE_SEARCH;
2629
2630 #else // !IA64
2631
2632 // Windows 98 reports faulting addresses incorrectly
2633 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2634 !os::win32::is_nt()) {
2635 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2636 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2637 }
2638 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2639 exceptionInfo->ContextRecord);
2640 return EXCEPTION_CONTINUE_SEARCH;
2641 #endif
2642 }
2643 }
2644 }
2645
2646 #ifdef _WIN64
2647 // Special care for fast JNI field accessors.
2648 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2649 // in and the heap gets shrunk before the field access.
2650 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2651 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2652 if (addr != (address)-1) {
2653 return Handle_Exception(exceptionInfo, addr);
2654 }
2655 }
2656 #endif
2657
2658 // Stack overflow or null pointer exception in native code.
2659 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2660 exceptionInfo->ContextRecord);
2661 return EXCEPTION_CONTINUE_SEARCH;
2662 } // /EXCEPTION_ACCESS_VIOLATION
2663 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2664 #if defined _M_IA64
2665 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2666 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2667 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2668
2669 // Compiled method patched to be non entrant? Following conditions must apply:
2670 // 1. must be first instruction in bundle
2671 // 2. must be a break instruction with appropriate code
2672 if ((((uint64_t) pc & 0x0F) == 0) &&
2673 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2674 return Handle_Exception(exceptionInfo,
2675 (address)SharedRuntime::get_handle_wrong_method_stub());
2676 }
2677 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2678 #endif
2679
2680
2681 if (in_java) {
2682 switch (exception_code) {
2683 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2684 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2685
2686 case EXCEPTION_INT_OVERFLOW:
2687 return Handle_IDiv_Exception(exceptionInfo);
2688
2689 } // switch
2690 }
2691 if (((thread->thread_state() == _thread_in_Java) ||
2692 (thread->thread_state() == _thread_in_native)) &&
2693 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2694 LONG result=Handle_FLT_Exception(exceptionInfo);
2695 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2696 }
2697 }
2698
2699 if (exception_code != EXCEPTION_BREAKPOINT) {
2700 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2701 exceptionInfo->ContextRecord);
2702 }
2703 return EXCEPTION_CONTINUE_SEARCH;
2704 }
2705
2706 #ifndef _WIN64
2707 // Special care for fast JNI accessors.
2708 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2709 // the heap gets shrunk before the field access.
2710 // Need to install our own structured exception handler since native code may
2711 // install its own.
2712 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2713 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2714 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2715 address pc = (address) exceptionInfo->ContextRecord->Eip;
2716 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2717 if (addr != (address)-1) {
2718 return Handle_Exception(exceptionInfo, addr);
2719 }
2720 }
2721 return EXCEPTION_CONTINUE_SEARCH;
2722 }
2723
2724 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2725 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2726 jobject obj, \
2727 jfieldID fieldID) { \
2728 __try { \
2729 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2730 obj, \
2731 fieldID); \
2732 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2733 _exception_info())) { \
2734 } \
2735 return 0; \
2736 }
2737
2738 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2739 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2740 DEFINE_FAST_GETFIELD(jchar, char, Char)
2741 DEFINE_FAST_GETFIELD(jshort, short, Short)
2742 DEFINE_FAST_GETFIELD(jint, int, Int)
2743 DEFINE_FAST_GETFIELD(jlong, long, Long)
2744 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2745 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2746
2747 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2748 switch (type) {
2749 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2750 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2751 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2752 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2753 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2754 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2755 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2756 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2757 default: ShouldNotReachHere();
2758 }
2759 return (address)-1;
2760 }
2761 #endif
2762
2763 // Virtual Memory
2764
2765 int os::vm_page_size() { return os::win32::vm_page_size(); }
2766 int os::vm_allocation_granularity() {
2767 return os::win32::vm_allocation_granularity();
2768 }
2769
2770 // Windows large page support is available on Windows 2003. In order to use
2771 // large page memory, the administrator must first assign additional privilege
2772 // to the user:
2773 // + select Control Panel -> Administrative Tools -> Local Security Policy
2774 // + select Local Policies -> User Rights Assignment
2775 // + double click "Lock pages in memory", add users and/or groups
2776 // + reboot
2777 // Note the above steps are needed for administrator as well, as administrators
2778 // by default do not have the privilege to lock pages in memory.
2779 //
2780 // Note about Windows 2003: although the API supports committing large page
2781 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2782 // scenario, I found through experiment it only uses large page if the entire
2783 // memory region is reserved and committed in a single VirtualAlloc() call.
2784 // This makes Windows large page support more or less like Solaris ISM, in
2785 // that the entire heap must be committed upfront. This probably will change
2786 // in the future, if so the code below needs to be revisited.
2787
2788 #ifndef MEM_LARGE_PAGES
2789 #define MEM_LARGE_PAGES 0x20000000
2790 #endif
2791
2792 static HANDLE _hProcess;
2793 static HANDLE _hToken;
2794
2795 // Container for NUMA node list info
2796 class NUMANodeListHolder {
2797 private:
2798 int *_numa_used_node_list; // allocated below
2799 int _numa_used_node_count;
2800
2801 void free_node_list() {
2802 if (_numa_used_node_list != NULL) {
2803 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2804 }
2805 }
2806
2807 public:
2808 NUMANodeListHolder() {
2809 _numa_used_node_count = 0;
2810 _numa_used_node_list = NULL;
2811 // do rest of initialization in build routine (after function pointers are set up)
2812 }
2813
2814 ~NUMANodeListHolder() {
2815 free_node_list();
2816 }
2817
2818 bool build() {
2819 DWORD_PTR proc_aff_mask;
2820 DWORD_PTR sys_aff_mask;
2821 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2822 ULONG highest_node_number;
2823 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2824 free_node_list();
2825 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2826 for (unsigned int i = 0; i <= highest_node_number; i++) {
2827 ULONGLONG proc_mask_numa_node;
2828 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2829 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2830 _numa_used_node_list[_numa_used_node_count++] = i;
2831 }
2832 }
2833 return (_numa_used_node_count > 1);
2834 }
2835
2836 int get_count() { return _numa_used_node_count; }
2837 int get_node_list_entry(int n) {
2838 // for indexes out of range, returns -1
2839 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2840 }
2841
2842 } numa_node_list_holder;
2843
2844
2845
2846 static size_t _large_page_size = 0;
2847
2848 static bool resolve_functions_for_large_page_init() {
2849 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2850 os::Advapi32Dll::AdvapiAvailable();
2851 }
2852
2853 static bool request_lock_memory_privilege() {
2854 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2855 os::current_process_id());
2856
2857 LUID luid;
2858 if (_hProcess != NULL &&
2859 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2860 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2861
2862 TOKEN_PRIVILEGES tp;
2863 tp.PrivilegeCount = 1;
2864 tp.Privileges[0].Luid = luid;
2865 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2866
2867 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2868 // privilege. Check GetLastError() too. See MSDN document.
2869 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2870 (GetLastError() == ERROR_SUCCESS)) {
2871 return true;
2872 }
2873 }
2874
2875 return false;
2876 }
2877
2878 static void cleanup_after_large_page_init() {
2879 if (_hProcess) CloseHandle(_hProcess);
2880 _hProcess = NULL;
2881 if (_hToken) CloseHandle(_hToken);
2882 _hToken = NULL;
2883 }
2884
2885 static bool numa_interleaving_init() {
2886 bool success = false;
2887 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2888
2889 // print a warning if UseNUMAInterleaving flag is specified on command line
2890 bool warn_on_failure = use_numa_interleaving_specified;
2891 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2892
2893 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2894 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2895 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2896
2897 if (os::Kernel32Dll::NumaCallsAvailable()) {
2898 if (numa_node_list_holder.build()) {
2899 if (PrintMiscellaneous && Verbose) {
2900 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2901 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2902 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2903 }
2904 tty->print("\n");
2905 }
2906 success = true;
2907 } else {
2908 WARN("Process does not cover multiple NUMA nodes.");
2909 }
2910 } else {
2911 WARN("NUMA Interleaving is not supported by the operating system.");
2912 }
2913 if (!success) {
2914 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2915 }
2916 return success;
2917 #undef WARN
2918 }
2919
2920 // this routine is used whenever we need to reserve a contiguous VA range
2921 // but we need to make separate VirtualAlloc calls for each piece of the range
2922 // Reasons for doing this:
2923 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2924 // * UseNUMAInterleaving requires a separate node for each piece
2925 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2926 DWORD prot,
2927 bool should_inject_error = false) {
2928 char * p_buf;
2929 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2930 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2931 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2932
2933 // first reserve enough address space in advance since we want to be
2934 // able to break a single contiguous virtual address range into multiple
2935 // large page commits but WS2003 does not allow reserving large page space
2936 // so we just use 4K pages for reserve, this gives us a legal contiguous
2937 // address space. then we will deallocate that reservation, and re alloc
2938 // using large pages
2939 const size_t size_of_reserve = bytes + chunk_size;
2940 if (bytes > size_of_reserve) {
2941 // Overflowed.
2942 return NULL;
2943 }
2944 p_buf = (char *) VirtualAlloc(addr,
2945 size_of_reserve, // size of Reserve
2946 MEM_RESERVE,
2947 PAGE_READWRITE);
2948 // If reservation failed, return NULL
2949 if (p_buf == NULL) return NULL;
2950 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2951 os::release_memory(p_buf, bytes + chunk_size);
2952
2953 // we still need to round up to a page boundary (in case we are using large pages)
2954 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2955 // instead we handle this in the bytes_to_rq computation below
2956 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2957
2958 // now go through and allocate one chunk at a time until all bytes are
2959 // allocated
2960 size_t bytes_remaining = bytes;
2961 // An overflow of align_size_up() would have been caught above
2962 // in the calculation of size_of_reserve.
2963 char * next_alloc_addr = p_buf;
2964 HANDLE hProc = GetCurrentProcess();
2965
2966 #ifdef ASSERT
2967 // Variable for the failure injection
2968 long ran_num = os::random();
2969 size_t fail_after = ran_num % bytes;
2970 #endif
2971
2972 int count=0;
2973 while (bytes_remaining) {
2974 // select bytes_to_rq to get to the next chunk_size boundary
2975
2976 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2977 // Note allocate and commit
2978 char * p_new;
2979
2980 #ifdef ASSERT
2981 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2982 #else
2983 const bool inject_error_now = false;
2984 #endif
2985
2986 if (inject_error_now) {
2987 p_new = NULL;
2988 } else {
2989 if (!UseNUMAInterleaving) {
2990 p_new = (char *) VirtualAlloc(next_alloc_addr,
2991 bytes_to_rq,
2992 flags,
2993 prot);
2994 } else {
2995 // get the next node to use from the used_node_list
2996 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2997 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2998 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2999 next_alloc_addr,
3000 bytes_to_rq,
3001 flags,
3002 prot,
3003 node);
3004 }
3005 }
3006
3007 if (p_new == NULL) {
3008 // Free any allocated pages
3009 if (next_alloc_addr > p_buf) {
3010 // Some memory was committed so release it.
3011 size_t bytes_to_release = bytes - bytes_remaining;
3012 // NMT has yet to record any individual blocks, so it
3013 // need to create a dummy 'reserve' record to match
3014 // the release.
3015 MemTracker::record_virtual_memory_reserve((address)p_buf,
3016 bytes_to_release, CALLER_PC);
3017 os::release_memory(p_buf, bytes_to_release);
3018 }
3019 #ifdef ASSERT
3020 if (should_inject_error) {
3021 if (TracePageSizes && Verbose) {
3022 tty->print_cr("Reserving pages individually failed.");
3023 }
3024 }
3025 #endif
3026 return NULL;
3027 }
3028
3029 bytes_remaining -= bytes_to_rq;
3030 next_alloc_addr += bytes_to_rq;
3031 count++;
3032 }
3033 // Although the memory is allocated individually, it is returned as one.
3034 // NMT records it as one block.
3035 if ((flags & MEM_COMMIT) != 0) {
3036 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3037 } else {
3038 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3039 }
3040
3041 // made it this far, success
3042 return p_buf;
3043 }
3044
3045
3046
3047 void os::large_page_init() {
3048 if (!UseLargePages) return;
3049
3050 // print a warning if any large page related flag is specified on command line
3051 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3052 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3053 bool success = false;
3054
3055 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3056 if (resolve_functions_for_large_page_init()) {
3057 if (request_lock_memory_privilege()) {
3058 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3059 if (s) {
3060 #if defined(IA32) || defined(AMD64)
3061 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3062 WARN("JVM cannot use large pages bigger than 4mb.");
3063 } else {
3064 #endif
3065 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3066 _large_page_size = LargePageSizeInBytes;
3067 } else {
3068 _large_page_size = s;
3069 }
3070 success = true;
3071 #if defined(IA32) || defined(AMD64)
3072 }
3073 #endif
3074 } else {
3075 WARN("Large page is not supported by the processor.");
3076 }
3077 } else {
3078 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3079 }
3080 } else {
3081 WARN("Large page is not supported by the operating system.");
3082 }
3083 #undef WARN
3084
3085 const size_t default_page_size = (size_t) vm_page_size();
3086 if (success && _large_page_size > default_page_size) {
3087 _page_sizes[0] = _large_page_size;
3088 _page_sizes[1] = default_page_size;
3089 _page_sizes[2] = 0;
3090 }
3091
3092 cleanup_after_large_page_init();
3093 UseLargePages = success;
3094 }
3095
3096 // On win32, one cannot release just a part of reserved memory, it's an
3097 // all or nothing deal. When we split a reservation, we must break the
3098 // reservation into two reservations.
3099 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3100 bool realloc) {
3101 if (size > 0) {
3102 release_memory(base, size);
3103 if (realloc) {
3104 reserve_memory(split, base);
3105 }
3106 if (size != split) {
3107 reserve_memory(size - split, base + split);
3108 }
3109 }
3110 }
3111
3112 // Multiple threads can race in this code but it's not possible to unmap small sections of
3113 // virtual space to get requested alignment, like posix-like os's.
3114 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3115 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3116 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3117 "Alignment must be a multiple of allocation granularity (page size)");
3118 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3119
3120 size_t extra_size = size + alignment;
3121 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3122
3123 char* aligned_base = NULL;
3124
3125 do {
3126 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3127 if (extra_base == NULL) {
3128 return NULL;
3129 }
3130 // Do manual alignment
3131 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3132
3133 os::release_memory(extra_base, extra_size);
3134
3135 aligned_base = os::reserve_memory(size, aligned_base);
3136
3137 } while (aligned_base == NULL);
3138
3139 return aligned_base;
3140 }
3141
3142 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3143 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3144 "reserve alignment");
3145 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3146 char* res;
3147 // note that if UseLargePages is on, all the areas that require interleaving
3148 // will go thru reserve_memory_special rather than thru here.
3149 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3150 if (!use_individual) {
3151 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3152 } else {
3153 elapsedTimer reserveTimer;
3154 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3155 // in numa interleaving, we have to allocate pages individually
3156 // (well really chunks of NUMAInterleaveGranularity size)
3157 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3158 if (res == NULL) {
3159 warning("NUMA page allocation failed");
3160 }
3161 if (Verbose && PrintMiscellaneous) {
3162 reserveTimer.stop();
3163 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3164 reserveTimer.milliseconds(), reserveTimer.ticks());
3165 }
3166 }
3167 assert(res == NULL || addr == NULL || addr == res,
3168 "Unexpected address from reserve.");
3169
3170 return res;
3171 }
3172
3173 // Reserve memory at an arbitrary address, only if that area is
3174 // available (and not reserved for something else).
3175 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3176 // Windows os::reserve_memory() fails of the requested address range is
3177 // not avilable.
3178 return reserve_memory(bytes, requested_addr);
3179 }
3180
3181 size_t os::large_page_size() {
3182 return _large_page_size;
3183 }
3184
3185 bool os::can_commit_large_page_memory() {
3186 // Windows only uses large page memory when the entire region is reserved
3187 // and committed in a single VirtualAlloc() call. This may change in the
3188 // future, but with Windows 2003 it's not possible to commit on demand.
3189 return false;
3190 }
3191
3192 bool os::can_execute_large_page_memory() {
3193 return true;
3194 }
3195
3196 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3197 bool exec) {
3198 assert(UseLargePages, "only for large pages");
3199
3200 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3201 return NULL; // Fallback to small pages.
3202 }
3203
3204 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3205 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3206
3207 // with large pages, there are two cases where we need to use Individual Allocation
3208 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3209 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3210 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3211 if (TracePageSizes && Verbose) {
3212 tty->print_cr("Reserving large pages individually.");
3213 }
3214 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3215 if (p_buf == NULL) {
3216 // give an appropriate warning message
3217 if (UseNUMAInterleaving) {
3218 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3219 }
3220 if (UseLargePagesIndividualAllocation) {
3221 warning("Individually allocated large pages failed, "
3222 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3223 }
3224 return NULL;
3225 }
3226
3227 return p_buf;
3228
3229 } else {
3230 if (TracePageSizes && Verbose) {
3231 tty->print_cr("Reserving large pages in a single large chunk.");
3232 }
3233 // normal policy just allocate it all at once
3234 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3235 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3236 if (res != NULL) {
3237 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3238 }
3239
3240 return res;
3241 }
3242 }
3243
3244 bool os::release_memory_special(char* base, size_t bytes) {
3245 assert(base != NULL, "Sanity check");
3246 return release_memory(base, bytes);
3247 }
3248
3249 void os::print_statistics() {
3250 }
3251
3252 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3253 int err = os::get_last_error();
3254 char buf[256];
3255 size_t buf_len = os::lasterror(buf, sizeof(buf));
3256 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3257 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3258 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3259 }
3260
3261 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3262 if (bytes == 0) {
3263 // Don't bother the OS with noops.
3264 return true;
3265 }
3266 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3267 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3268 // Don't attempt to print anything if the OS call fails. We're
3269 // probably low on resources, so the print itself may cause crashes.
3270
3271 // unless we have NUMAInterleaving enabled, the range of a commit
3272 // is always within a reserve covered by a single VirtualAlloc
3273 // in that case we can just do a single commit for the requested size
3274 if (!UseNUMAInterleaving) {
3275 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3276 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3277 return false;
3278 }
3279 if (exec) {
3280 DWORD oldprot;
3281 // Windows doc says to use VirtualProtect to get execute permissions
3282 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3283 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3284 return false;
3285 }
3286 }
3287 return true;
3288 } else {
3289
3290 // when NUMAInterleaving is enabled, the commit might cover a range that
3291 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3292 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3293 // returns represents the number of bytes that can be committed in one step.
3294 size_t bytes_remaining = bytes;
3295 char * next_alloc_addr = addr;
3296 while (bytes_remaining > 0) {
3297 MEMORY_BASIC_INFORMATION alloc_info;
3298 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3299 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3300 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3301 PAGE_READWRITE) == NULL) {
3302 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3303 exec);)
3304 return false;
3305 }
3306 if (exec) {
3307 DWORD oldprot;
3308 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3309 PAGE_EXECUTE_READWRITE, &oldprot)) {
3310 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3311 exec);)
3312 return false;
3313 }
3314 }
3315 bytes_remaining -= bytes_to_rq;
3316 next_alloc_addr += bytes_to_rq;
3317 }
3318 }
3319 // if we made it this far, return true
3320 return true;
3321 }
3322
3323 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3324 bool exec) {
3325 // alignment_hint is ignored on this OS
3326 return pd_commit_memory(addr, size, exec);
3327 }
3328
3329 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3330 const char* mesg) {
3331 assert(mesg != NULL, "mesg must be specified");
3332 if (!pd_commit_memory(addr, size, exec)) {
3333 warn_fail_commit_memory(addr, size, exec);
3334 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3335 }
3336 }
3337
3338 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3339 size_t alignment_hint, bool exec,
3340 const char* mesg) {
3341 // alignment_hint is ignored on this OS
3342 pd_commit_memory_or_exit(addr, size, exec, mesg);
3343 }
3344
3345 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3346 if (bytes == 0) {
3347 // Don't bother the OS with noops.
3348 return true;
3349 }
3350 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3351 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3352 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3353 }
3354
3355 bool os::pd_release_memory(char* addr, size_t bytes) {
3356 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3357 }
3358
3359 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3360 return os::commit_memory(addr, size, !ExecMem);
3361 }
3362
3363 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3364 return os::uncommit_memory(addr, size);
3365 }
3366
3367 // Set protections specified
3368 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3369 bool is_committed) {
3370 unsigned int p = 0;
3371 switch (prot) {
3372 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3373 case MEM_PROT_READ: p = PAGE_READONLY; break;
3374 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3375 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3376 default:
3377 ShouldNotReachHere();
3378 }
3379
3380 DWORD old_status;
3381
3382 // Strange enough, but on Win32 one can change protection only for committed
3383 // memory, not a big deal anyway, as bytes less or equal than 64K
3384 if (!is_committed) {
3385 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3386 "cannot commit protection page");
3387 }
3388 // One cannot use os::guard_memory() here, as on Win32 guard page
3389 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3390 //
3391 // Pages in the region become guard pages. Any attempt to access a guard page
3392 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3393 // the guard page status. Guard pages thus act as a one-time access alarm.
3394 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3395 }
3396
3397 bool os::guard_memory(char* addr, size_t bytes) {
3398 DWORD old_status;
3399 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3400 }
3401
3402 bool os::unguard_memory(char* addr, size_t bytes) {
3403 DWORD old_status;
3404 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3405 }
3406
3407 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3408 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3409 void os::numa_make_global(char *addr, size_t bytes) { }
3410 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3411 bool os::numa_topology_changed() { return false; }
3412 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3413 int os::numa_get_group_id() { return 0; }
3414 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3415 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3416 // Provide an answer for UMA systems
3417 ids[0] = 0;
3418 return 1;
3419 } else {
3420 // check for size bigger than actual groups_num
3421 size = MIN2(size, numa_get_groups_num());
3422 for (int i = 0; i < (int)size; i++) {
3423 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3424 }
3425 return size;
3426 }
3427 }
3428
3429 bool os::get_page_info(char *start, page_info* info) {
3430 return false;
3431 }
3432
3433 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3434 page_info* page_found) {
3435 return end;
3436 }
3437
3438 char* os::non_memory_address_word() {
3439 // Must never look like an address returned by reserve_memory,
3440 // even in its subfields (as defined by the CPU immediate fields,
3441 // if the CPU splits constants across multiple instructions).
3442 return (char*)-1;
3443 }
3444
3445 #define MAX_ERROR_COUNT 100
3446 #define SYS_THREAD_ERROR 0xffffffffUL
3447
3448 void os::pd_start_thread(Thread* thread) {
3449 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3450 // Returns previous suspend state:
3451 // 0: Thread was not suspended
3452 // 1: Thread is running now
3453 // >1: Thread is still suspended.
3454 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3455 }
3456
3457 class HighResolutionInterval : public CHeapObj<mtThread> {
3458 // The default timer resolution seems to be 10 milliseconds.
3459 // (Where is this written down?)
3460 // If someone wants to sleep for only a fraction of the default,
3461 // then we set the timer resolution down to 1 millisecond for
3462 // the duration of their interval.
3463 // We carefully set the resolution back, since otherwise we
3464 // seem to incur an overhead (3%?) that we don't need.
3465 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3466 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3467 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3468 // timeBeginPeriod() if the relative error exceeded some threshold.
3469 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3470 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3471 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3472 // resolution timers running.
3473 private:
3474 jlong resolution;
3475 public:
3476 HighResolutionInterval(jlong ms) {
3477 resolution = ms % 10L;
3478 if (resolution != 0) {
3479 MMRESULT result = timeBeginPeriod(1L);
3480 }
3481 }
3482 ~HighResolutionInterval() {
3483 if (resolution != 0) {
3484 MMRESULT result = timeEndPeriod(1L);
3485 }
3486 resolution = 0L;
3487 }
3488 };
3489
3490 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3491 jlong limit = (jlong) MAXDWORD;
3492
3493 while (ms > limit) {
3494 int res;
3495 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3496 return res;
3497 }
3498 ms -= limit;
3499 }
3500
3501 assert(thread == Thread::current(), "thread consistency check");
3502 OSThread* osthread = thread->osthread();
3503 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3504 int result;
3505 if (interruptable) {
3506 assert(thread->is_Java_thread(), "must be java thread");
3507 JavaThread *jt = (JavaThread *) thread;
3508 ThreadBlockInVM tbivm(jt);
3509
3510 jt->set_suspend_equivalent();
3511 // cleared by handle_special_suspend_equivalent_condition() or
3512 // java_suspend_self() via check_and_wait_while_suspended()
3513
3514 HANDLE events[1];
3515 events[0] = osthread->interrupt_event();
3516 HighResolutionInterval *phri=NULL;
3517 if (!ForceTimeHighResolution) {
3518 phri = new HighResolutionInterval(ms);
3519 }
3520 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3521 result = OS_TIMEOUT;
3522 } else {
3523 ResetEvent(osthread->interrupt_event());
3524 osthread->set_interrupted(false);
3525 result = OS_INTRPT;
3526 }
3527 delete phri; //if it is NULL, harmless
3528
3529 // were we externally suspended while we were waiting?
3530 jt->check_and_wait_while_suspended();
3531 } else {
3532 assert(!thread->is_Java_thread(), "must not be java thread");
3533 Sleep((long) ms);
3534 result = OS_TIMEOUT;
3535 }
3536 return result;
3537 }
3538
3539 // Short sleep, direct OS call.
3540 //
3541 // ms = 0, means allow others (if any) to run.
3542 //
3543 void os::naked_short_sleep(jlong ms) {
3544 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3545 Sleep(ms);
3546 }
3547
3548 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3549 void os::infinite_sleep() {
3550 while (true) { // sleep forever ...
3551 Sleep(100000); // ... 100 seconds at a time
3552 }
3553 }
3554
3555 typedef BOOL (WINAPI * STTSignature)(void);
3556
3557 void os::naked_yield() {
3558 // Use either SwitchToThread() or Sleep(0)
3559 // Consider passing back the return value from SwitchToThread().
3560 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3561 SwitchToThread();
3562 } else {
3563 Sleep(0);
3564 }
3565 }
3566
3567 // Win32 only gives you access to seven real priorities at a time,
3568 // so we compress Java's ten down to seven. It would be better
3569 // if we dynamically adjusted relative priorities.
3570
3571 int os::java_to_os_priority[CriticalPriority + 1] = {
3572 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3573 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3574 THREAD_PRIORITY_LOWEST, // 2
3575 THREAD_PRIORITY_BELOW_NORMAL, // 3
3576 THREAD_PRIORITY_BELOW_NORMAL, // 4
3577 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3578 THREAD_PRIORITY_NORMAL, // 6
3579 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3580 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3581 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3582 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3583 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3584 };
3585
3586 int prio_policy1[CriticalPriority + 1] = {
3587 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3588 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3589 THREAD_PRIORITY_LOWEST, // 2
3590 THREAD_PRIORITY_BELOW_NORMAL, // 3
3591 THREAD_PRIORITY_BELOW_NORMAL, // 4
3592 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3593 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3594 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3595 THREAD_PRIORITY_HIGHEST, // 8
3596 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3597 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3598 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3599 };
3600
3601 static int prio_init() {
3602 // If ThreadPriorityPolicy is 1, switch tables
3603 if (ThreadPriorityPolicy == 1) {
3604 int i;
3605 for (i = 0; i < CriticalPriority + 1; i++) {
3606 os::java_to_os_priority[i] = prio_policy1[i];
3607 }
3608 }
3609 if (UseCriticalJavaThreadPriority) {
3610 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3611 }
3612 return 0;
3613 }
3614
3615 OSReturn os::set_native_priority(Thread* thread, int priority) {
3616 if (!UseThreadPriorities) return OS_OK;
3617 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3618 return ret ? OS_OK : OS_ERR;
3619 }
3620
3621 OSReturn os::get_native_priority(const Thread* const thread,
3622 int* priority_ptr) {
3623 if (!UseThreadPriorities) {
3624 *priority_ptr = java_to_os_priority[NormPriority];
3625 return OS_OK;
3626 }
3627 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3628 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3629 assert(false, "GetThreadPriority failed");
3630 return OS_ERR;
3631 }
3632 *priority_ptr = os_prio;
3633 return OS_OK;
3634 }
3635
3636
3637 // Hint to the underlying OS that a task switch would not be good.
3638 // Void return because it's a hint and can fail.
3639 void os::hint_no_preempt() {}
3640
3641 void os::interrupt(Thread* thread) {
3642 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3643 Threads_lock->owned_by_self(),
3644 "possibility of dangling Thread pointer");
3645
3646 OSThread* osthread = thread->osthread();
3647 osthread->set_interrupted(true);
3648 // More than one thread can get here with the same value of osthread,
3649 // resulting in multiple notifications. We do, however, want the store
3650 // to interrupted() to be visible to other threads before we post
3651 // the interrupt event.
3652 OrderAccess::release();
3653 SetEvent(osthread->interrupt_event());
3654 // For JSR166: unpark after setting status
3655 if (thread->is_Java_thread()) {
3656 ((JavaThread*)thread)->parker()->unpark();
3657 }
3658
3659 ParkEvent * ev = thread->_ParkEvent;
3660 if (ev != NULL) ev->unpark();
3661 }
3662
3663
3664 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3665 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3666 "possibility of dangling Thread pointer");
3667
3668 OSThread* osthread = thread->osthread();
3669 // There is no synchronization between the setting of the interrupt
3670 // and it being cleared here. It is critical - see 6535709 - that
3671 // we only clear the interrupt state, and reset the interrupt event,
3672 // if we are going to report that we were indeed interrupted - else
3673 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3674 // depending on the timing. By checking thread interrupt event to see
3675 // if the thread gets real interrupt thus prevent spurious wakeup.
3676 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3677 if (interrupted && clear_interrupted) {
3678 osthread->set_interrupted(false);
3679 ResetEvent(osthread->interrupt_event());
3680 } // Otherwise leave the interrupted state alone
3681
3682 return interrupted;
3683 }
3684
3685 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3686 ExtendedPC os::get_thread_pc(Thread* thread) {
3687 CONTEXT context;
3688 context.ContextFlags = CONTEXT_CONTROL;
3689 HANDLE handle = thread->osthread()->thread_handle();
3690 #ifdef _M_IA64
3691 assert(0, "Fix get_thread_pc");
3692 return ExtendedPC(NULL);
3693 #else
3694 if (GetThreadContext(handle, &context)) {
3695 #ifdef _M_AMD64
3696 return ExtendedPC((address) context.Rip);
3697 #else
3698 return ExtendedPC((address) context.Eip);
3699 #endif
3700 } else {
3701 return ExtendedPC(NULL);
3702 }
3703 #endif
3704 }
3705
3706 // GetCurrentThreadId() returns DWORD
3707 intx os::current_thread_id() { return GetCurrentThreadId(); }
3708
3709 static int _initial_pid = 0;
3710
3711 int os::current_process_id() {
3712 return (_initial_pid ? _initial_pid : _getpid());
3713 }
3714
3715 int os::win32::_vm_page_size = 0;
3716 int os::win32::_vm_allocation_granularity = 0;
3717 int os::win32::_processor_type = 0;
3718 // Processor level is not available on non-NT systems, use vm_version instead
3719 int os::win32::_processor_level = 0;
3720 julong os::win32::_physical_memory = 0;
3721 size_t os::win32::_default_stack_size = 0;
3722
3723 intx os::win32::_os_thread_limit = 0;
3724 volatile intx os::win32::_os_thread_count = 0;
3725
3726 bool os::win32::_is_nt = false;
3727 bool os::win32::_is_windows_2003 = false;
3728 bool os::win32::_is_windows_server = false;
3729
3730 // 6573254
3731 // Currently, the bug is observed across all the supported Windows releases,
3732 // including the latest one (as of this writing - Windows Server 2012 R2)
3733 bool os::win32::_has_exit_bug = true;
3734 bool os::win32::_has_performance_count = 0;
3735
3736 void os::win32::initialize_system_info() {
3737 SYSTEM_INFO si;
3738 GetSystemInfo(&si);
3739 _vm_page_size = si.dwPageSize;
3740 _vm_allocation_granularity = si.dwAllocationGranularity;
3741 _processor_type = si.dwProcessorType;
3742 _processor_level = si.wProcessorLevel;
3743 set_processor_count(si.dwNumberOfProcessors);
3744
3745 MEMORYSTATUSEX ms;
3746 ms.dwLength = sizeof(ms);
3747
3748 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3749 // dwMemoryLoad (% of memory in use)
3750 GlobalMemoryStatusEx(&ms);
3751 _physical_memory = ms.ullTotalPhys;
3752
3753 OSVERSIONINFOEX oi;
3754 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3755 GetVersionEx((OSVERSIONINFO*)&oi);
3756 switch (oi.dwPlatformId) {
3757 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3758 case VER_PLATFORM_WIN32_NT:
3759 _is_nt = true;
3760 {
3761 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3762 if (os_vers == 5002) {
3763 _is_windows_2003 = true;
3764 }
3765 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3766 oi.wProductType == VER_NT_SERVER) {
3767 _is_windows_server = true;
3768 }
3769 }
3770 break;
3771 default: fatal("Unknown platform");
3772 }
3773
3774 _default_stack_size = os::current_stack_size();
3775 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3776 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3777 "stack size not a multiple of page size");
3778
3779 initialize_performance_counter();
3780 }
3781
3782
3783 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3784 int ebuflen) {
3785 char path[MAX_PATH];
3786 DWORD size;
3787 DWORD pathLen = (DWORD)sizeof(path);
3788 HINSTANCE result = NULL;
3789
3790 // only allow library name without path component
3791 assert(strchr(name, '\\') == NULL, "path not allowed");
3792 assert(strchr(name, ':') == NULL, "path not allowed");
3793 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3794 jio_snprintf(ebuf, ebuflen,
3795 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3796 return NULL;
3797 }
3798
3799 // search system directory
3800 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3801 if (size >= pathLen) {
3802 return NULL; // truncated
3803 }
3804 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3805 return NULL; // truncated
3806 }
3807 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3808 return result;
3809 }
3810 }
3811
3812 // try Windows directory
3813 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3814 if (size >= pathLen) {
3815 return NULL; // truncated
3816 }
3817 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3818 return NULL; // truncated
3819 }
3820 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3821 return result;
3822 }
3823 }
3824
3825 jio_snprintf(ebuf, ebuflen,
3826 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3827 return NULL;
3828 }
3829
3830 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3831
3832 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3833 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3834 return TRUE;
3835 }
3836
3837 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3838 // Basic approach:
3839 // - Each exiting thread registers its intent to exit and then does so.
3840 // - A thread trying to terminate the process must wait for all
3841 // threads currently exiting to complete their exit.
3842
3843 if (os::win32::has_exit_bug()) {
3844 // The array holds handles of the threads that have started exiting by calling
3845 // _endthreadex().
3846 // Should be large enough to avoid blocking the exiting thread due to lack of
3847 // a free slot.
3848 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3849 static int handle_count = 0;
3850
3851 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3852 static CRITICAL_SECTION crit_sect;
3853 static volatile jint process_exiting = 0;
3854 int i, j;
3855 DWORD res;
3856 HANDLE hproc, hthr;
3857
3858 // The first thread that reached this point, initializes the critical section.
3859 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3860 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3861 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3862 EnterCriticalSection(&crit_sect);
3863
3864 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3865 // Remove from the array those handles of the threads that have completed exiting.
3866 for (i = 0, j = 0; i < handle_count; ++i) {
3867 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3868 if (res == WAIT_TIMEOUT) {
3869 handles[j++] = handles[i];
3870 } else {
3871 if (res == WAIT_FAILED) {
3872 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3873 GetLastError(), __FILE__, __LINE__);
3874 }
3875 // Don't keep the handle, if we failed waiting for it.
3876 CloseHandle(handles[i]);
3877 }
3878 }
3879
3880 // If there's no free slot in the array of the kept handles, we'll have to
3881 // wait until at least one thread completes exiting.
3882 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3883 // Raise the priority of the oldest exiting thread to increase its chances
3884 // to complete sooner.
3885 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3886 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3887 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3888 i = (res - WAIT_OBJECT_0);
3889 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3890 for (; i < handle_count; ++i) {
3891 handles[i] = handles[i + 1];
3892 }
3893 } else {
3894 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3895 (res == WAIT_FAILED ? "failed" : "timed out"),
3896 GetLastError(), __FILE__, __LINE__);
3897 // Don't keep handles, if we failed waiting for them.
3898 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3899 CloseHandle(handles[i]);
3900 }
3901 handle_count = 0;
3902 }
3903 }
3904
3905 // Store a duplicate of the current thread handle in the array of handles.
3906 hproc = GetCurrentProcess();
3907 hthr = GetCurrentThread();
3908 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3909 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3910 warning("DuplicateHandle failed (%u) in %s: %d\n",
3911 GetLastError(), __FILE__, __LINE__);
3912 } else {
3913 ++handle_count;
3914 }
3915
3916 // The current exiting thread has stored its handle in the array, and now
3917 // should leave the critical section before calling _endthreadex().
3918
3919 } else if (what != EPT_THREAD) {
3920 if (handle_count > 0) {
3921 // Before ending the process, make sure all the threads that had called
3922 // _endthreadex() completed.
3923
3924 // Set the priority level of the current thread to the same value as
3925 // the priority level of exiting threads.
3926 // This is to ensure it will be given a fair chance to execute if
3927 // the timeout expires.
3928 hthr = GetCurrentThread();
3929 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3930 for (i = 0; i < handle_count; ++i) {
3931 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3932 }
3933 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3934 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3935 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3936 (res == WAIT_FAILED ? "failed" : "timed out"),
3937 GetLastError(), __FILE__, __LINE__);
3938 }
3939 for (i = 0; i < handle_count; ++i) {
3940 CloseHandle(handles[i]);
3941 }
3942 handle_count = 0;
3943 }
3944
3945 OrderAccess::release_store(&process_exiting, 1);
3946 }
3947
3948 LeaveCriticalSection(&crit_sect);
3949 }
3950
3951 if (what == EPT_THREAD) {
3952 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3953 // Some other thread is about to call exit(), so we
3954 // don't let the current thread proceed to _endthreadex()
3955 SuspendThread(GetCurrentThread());
3956 // Avoid busy-wait loop, if SuspendThread() failed.
3957 Sleep(EXIT_TIMEOUT);
3958 }
3959 }
3960 }
3961
3962 // We are here if either
3963 // - there's no 'race at exit' bug on this OS release;
3964 // - initialization of the critical section failed (unlikely);
3965 // - the current thread has stored its handle and left the critical section;
3966 // - the process-exiting thread has raised the flag and left the critical section.
3967 if (what == EPT_THREAD) {
3968 _endthreadex((unsigned)exit_code);
3969 } else if (what == EPT_PROCESS) {
3970 ::exit(exit_code);
3971 } else {
3972 _exit(exit_code);
3973 }
3974
3975 // Should not reach here
3976 return exit_code;
3977 }
3978
3979 #undef EXIT_TIMEOUT
3980
3981 void os::win32::setmode_streams() {
3982 _setmode(_fileno(stdin), _O_BINARY);
3983 _setmode(_fileno(stdout), _O_BINARY);
3984 _setmode(_fileno(stderr), _O_BINARY);
3985 }
3986
3987
3988 bool os::is_debugger_attached() {
3989 return IsDebuggerPresent() ? true : false;
3990 }
3991
3992
3993 void os::wait_for_keypress_at_exit(void) {
3994 if (PauseAtExit) {
3995 fprintf(stderr, "Press any key to continue...\n");
3996 fgetc(stdin);
3997 }
3998 }
3999
4000
4001 int os::message_box(const char* title, const char* message) {
4002 int result = MessageBox(NULL, message, title,
4003 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4004 return result == IDYES;
4005 }
4006
4007 #ifndef PRODUCT
4008 #ifndef _WIN64
4009 // Helpers to check whether NX protection is enabled
4010 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4011 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4012 pex->ExceptionRecord->NumberParameters > 0 &&
4013 pex->ExceptionRecord->ExceptionInformation[0] ==
4014 EXCEPTION_INFO_EXEC_VIOLATION) {
4015 return EXCEPTION_EXECUTE_HANDLER;
4016 }
4017 return EXCEPTION_CONTINUE_SEARCH;
4018 }
4019
4020 void nx_check_protection() {
4021 // If NX is enabled we'll get an exception calling into code on the stack
4022 char code[] = { (char)0xC3 }; // ret
4023 void *code_ptr = (void *)code;
4024 __try {
4025 __asm call code_ptr
4026 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4027 tty->print_raw_cr("NX protection detected.");
4028 }
4029 }
4030 #endif // _WIN64
4031 #endif // PRODUCT
4032
4033 // this is called _before_ the global arguments have been parsed
4034 void os::init(void) {
4035 _initial_pid = _getpid();
4036
4037 init_random(1234567);
4038
4039 win32::initialize_system_info();
4040 win32::setmode_streams();
4041 init_page_sizes((size_t) win32::vm_page_size());
4042
4043 // This may be overridden later when argument processing is done.
4044 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4045 os::win32::is_windows_2003());
4046
4047 // Initialize main_process and main_thread
4048 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4049 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4050 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4051 fatal("DuplicateHandle failed\n");
4052 }
4053 main_thread_id = (int) GetCurrentThreadId();
4054
4055 // initialize fast thread access - only used for 32-bit
4056 win32::initialize_thread_ptr_offset();
4057 }
4058
4059 // To install functions for atexit processing
4060 extern "C" {
4061 static void perfMemory_exit_helper() {
4062 perfMemory_exit();
4063 }
4064 }
4065
4066 static jint initSock();
4067
4068 // this is called _after_ the global arguments have been parsed
4069 jint os::init_2(void) {
4070 // Allocate a single page and mark it as readable for safepoint polling
4071 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4072 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4073
4074 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4075 guarantee(return_page != NULL, "Commit Failed for polling page");
4076
4077 os::set_polling_page(polling_page);
4078
4079 #ifndef PRODUCT
4080 if (Verbose && PrintMiscellaneous) {
4081 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4082 (intptr_t)polling_page);
4083 }
4084 #endif
4085
4086 if (!UseMembar) {
4087 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4088 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4089
4090 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4091 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4092
4093 os::set_memory_serialize_page(mem_serialize_page);
4094
4095 #ifndef PRODUCT
4096 if (Verbose && PrintMiscellaneous) {
4097 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4098 (intptr_t)mem_serialize_page);
4099 }
4100 #endif
4101 }
4102
4103 // Setup Windows Exceptions
4104
4105 // for debugging float code generation bugs
4106 if (ForceFloatExceptions) {
4107 #ifndef _WIN64
4108 static long fp_control_word = 0;
4109 __asm { fstcw fp_control_word }
4110 // see Intel PPro Manual, Vol. 2, p 7-16
4111 const long precision = 0x20;
4112 const long underflow = 0x10;
4113 const long overflow = 0x08;
4114 const long zero_div = 0x04;
4115 const long denorm = 0x02;
4116 const long invalid = 0x01;
4117 fp_control_word |= invalid;
4118 __asm { fldcw fp_control_word }
4119 #endif
4120 }
4121
4122 // If stack_commit_size is 0, windows will reserve the default size,
4123 // but only commit a small portion of it.
4124 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4125 size_t default_reserve_size = os::win32::default_stack_size();
4126 size_t actual_reserve_size = stack_commit_size;
4127 if (stack_commit_size < default_reserve_size) {
4128 // If stack_commit_size == 0, we want this too
4129 actual_reserve_size = default_reserve_size;
4130 }
4131
4132 // Check minimum allowable stack size for thread creation and to initialize
4133 // the java system classes, including StackOverflowError - depends on page
4134 // size. Add a page for compiler2 recursion in main thread.
4135 // Add in 2*BytesPerWord times page size to account for VM stack during
4136 // class initialization depending on 32 or 64 bit VM.
4137 size_t min_stack_allowed =
4138 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4139 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4140 if (actual_reserve_size < min_stack_allowed) {
4141 tty->print_cr("\nThe stack size specified is too small, "
4142 "Specify at least %dk",
4143 min_stack_allowed / K);
4144 return JNI_ERR;
4145 }
4146
4147 JavaThread::set_stack_size_at_create(stack_commit_size);
4148
4149 // Calculate theoretical max. size of Threads to guard gainst artifical
4150 // out-of-memory situations, where all available address-space has been
4151 // reserved by thread stacks.
4152 assert(actual_reserve_size != 0, "Must have a stack");
4153
4154 // Calculate the thread limit when we should start doing Virtual Memory
4155 // banging. Currently when the threads will have used all but 200Mb of space.
4156 //
4157 // TODO: consider performing a similar calculation for commit size instead
4158 // as reserve size, since on a 64-bit platform we'll run into that more
4159 // often than running out of virtual memory space. We can use the
4160 // lower value of the two calculations as the os_thread_limit.
4161 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4162 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4163
4164 // at exit methods are called in the reverse order of their registration.
4165 // there is no limit to the number of functions registered. atexit does
4166 // not set errno.
4167
4168 if (PerfAllowAtExitRegistration) {
4169 // only register atexit functions if PerfAllowAtExitRegistration is set.
4170 // atexit functions can be delayed until process exit time, which
4171 // can be problematic for embedded VM situations. Embedded VMs should
4172 // call DestroyJavaVM() to assure that VM resources are released.
4173
4174 // note: perfMemory_exit_helper atexit function may be removed in
4175 // the future if the appropriate cleanup code can be added to the
4176 // VM_Exit VMOperation's doit method.
4177 if (atexit(perfMemory_exit_helper) != 0) {
4178 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4179 }
4180 }
4181
4182 #ifndef _WIN64
4183 // Print something if NX is enabled (win32 on AMD64)
4184 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4185 #endif
4186
4187 // initialize thread priority policy
4188 prio_init();
4189
4190 if (UseNUMA && !ForceNUMA) {
4191 UseNUMA = false; // We don't fully support this yet
4192 }
4193
4194 if (UseNUMAInterleaving) {
4195 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4196 bool success = numa_interleaving_init();
4197 if (!success) UseNUMAInterleaving = false;
4198 }
4199
4200 if (initSock() != JNI_OK) {
4201 return JNI_ERR;
4202 }
4203
4204 return JNI_OK;
4205 }
4206
4207 // Mark the polling page as unreadable
4208 void os::make_polling_page_unreadable(void) {
4209 DWORD old_status;
4210 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4211 PAGE_NOACCESS, &old_status)) {
4212 fatal("Could not disable polling page");
4213 }
4214 }
4215
4216 // Mark the polling page as readable
4217 void os::make_polling_page_readable(void) {
4218 DWORD old_status;
4219 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4220 PAGE_READONLY, &old_status)) {
4221 fatal("Could not enable polling page");
4222 }
4223 }
4224
4225
4226 int os::stat(const char *path, struct stat *sbuf) {
4227 char pathbuf[MAX_PATH];
4228 if (strlen(path) > MAX_PATH - 1) {
4229 errno = ENAMETOOLONG;
4230 return -1;
4231 }
4232 os::native_path(strcpy(pathbuf, path));
4233 int ret = ::stat(pathbuf, sbuf);
4234 if (sbuf != NULL && UseUTCFileTimestamp) {
4235 // Fix for 6539723. st_mtime returned from stat() is dependent on
4236 // the system timezone and so can return different values for the
4237 // same file if/when daylight savings time changes. This adjustment
4238 // makes sure the same timestamp is returned regardless of the TZ.
4239 //
4240 // See:
4241 // http://msdn.microsoft.com/library/
4242 // default.asp?url=/library/en-us/sysinfo/base/
4243 // time_zone_information_str.asp
4244 // and
4245 // http://msdn.microsoft.com/library/default.asp?url=
4246 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4247 //
4248 // NOTE: there is a insidious bug here: If the timezone is changed
4249 // after the call to stat() but before 'GetTimeZoneInformation()', then
4250 // the adjustment we do here will be wrong and we'll return the wrong
4251 // value (which will likely end up creating an invalid class data
4252 // archive). Absent a better API for this, or some time zone locking
4253 // mechanism, we'll have to live with this risk.
4254 TIME_ZONE_INFORMATION tz;
4255 DWORD tzid = GetTimeZoneInformation(&tz);
4256 int daylightBias =
4257 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4258 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4259 }
4260 return ret;
4261 }
4262
4263
4264 #define FT2INT64(ft) \
4265 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4266
4267
4268 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4269 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4270 // of a thread.
4271 //
4272 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4273 // the fast estimate available on the platform.
4274
4275 // current_thread_cpu_time() is not optimized for Windows yet
4276 jlong os::current_thread_cpu_time() {
4277 // return user + sys since the cost is the same
4278 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4279 }
4280
4281 jlong os::thread_cpu_time(Thread* thread) {
4282 // consistent with what current_thread_cpu_time() returns.
4283 return os::thread_cpu_time(thread, true /* user+sys */);
4284 }
4285
4286 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4287 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4288 }
4289
4290 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4291 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4292 // If this function changes, os::is_thread_cpu_time_supported() should too
4293 if (os::win32::is_nt()) {
4294 FILETIME CreationTime;
4295 FILETIME ExitTime;
4296 FILETIME KernelTime;
4297 FILETIME UserTime;
4298
4299 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4300 &ExitTime, &KernelTime, &UserTime) == 0) {
4301 return -1;
4302 } else if (user_sys_cpu_time) {
4303 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4304 } else {
4305 return FT2INT64(UserTime) * 100;
4306 }
4307 } else {
4308 return (jlong) timeGetTime() * 1000000;
4309 }
4310 }
4311
4312 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4313 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4314 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4315 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4316 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4317 }
4318
4319 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4320 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4321 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4322 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4323 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4324 }
4325
4326 bool os::is_thread_cpu_time_supported() {
4327 // see os::thread_cpu_time
4328 if (os::win32::is_nt()) {
4329 FILETIME CreationTime;
4330 FILETIME ExitTime;
4331 FILETIME KernelTime;
4332 FILETIME UserTime;
4333
4334 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4335 &KernelTime, &UserTime) == 0) {
4336 return false;
4337 } else {
4338 return true;
4339 }
4340 } else {
4341 return false;
4342 }
4343 }
4344
4345 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4346 // It does have primitives (PDH API) to get CPU usage and run queue length.
4347 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4348 // If we wanted to implement loadavg on Windows, we have a few options:
4349 //
4350 // a) Query CPU usage and run queue length and "fake" an answer by
4351 // returning the CPU usage if it's under 100%, and the run queue
4352 // length otherwise. It turns out that querying is pretty slow
4353 // on Windows, on the order of 200 microseconds on a fast machine.
4354 // Note that on the Windows the CPU usage value is the % usage
4355 // since the last time the API was called (and the first call
4356 // returns 100%), so we'd have to deal with that as well.
4357 //
4358 // b) Sample the "fake" answer using a sampling thread and store
4359 // the answer in a global variable. The call to loadavg would
4360 // just return the value of the global, avoiding the slow query.
4361 //
4362 // c) Sample a better answer using exponential decay to smooth the
4363 // value. This is basically the algorithm used by UNIX kernels.
4364 //
4365 // Note that sampling thread starvation could affect both (b) and (c).
4366 int os::loadavg(double loadavg[], int nelem) {
4367 return -1;
4368 }
4369
4370
4371 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4372 bool os::dont_yield() {
4373 return DontYieldALot;
4374 }
4375
4376 // This method is a slightly reworked copy of JDK's sysOpen
4377 // from src/windows/hpi/src/sys_api_md.c
4378
4379 int os::open(const char *path, int oflag, int mode) {
4380 char pathbuf[MAX_PATH];
4381
4382 if (strlen(path) > MAX_PATH - 1) {
4383 errno = ENAMETOOLONG;
4384 return -1;
4385 }
4386 os::native_path(strcpy(pathbuf, path));
4387 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4388 }
4389
4390 FILE* os::open(int fd, const char* mode) {
4391 return ::_fdopen(fd, mode);
4392 }
4393
4394 // Is a (classpath) directory empty?
4395 bool os::dir_is_empty(const char* path) {
4396 WIN32_FIND_DATA fd;
4397 HANDLE f = FindFirstFile(path, &fd);
4398 if (f == INVALID_HANDLE_VALUE) {
4399 return true;
4400 }
4401 FindClose(f);
4402 return false;
4403 }
4404
4405 // create binary file, rewriting existing file if required
4406 int os::create_binary_file(const char* path, bool rewrite_existing) {
4407 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4408 if (!rewrite_existing) {
4409 oflags |= _O_EXCL;
4410 }
4411 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4412 }
4413
4414 // return current position of file pointer
4415 jlong os::current_file_offset(int fd) {
4416 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4417 }
4418
4419 // move file pointer to the specified offset
4420 jlong os::seek_to_file_offset(int fd, jlong offset) {
4421 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4422 }
4423
4424
4425 jlong os::lseek(int fd, jlong offset, int whence) {
4426 return (jlong) ::_lseeki64(fd, offset, whence);
4427 }
4428
4429 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4430 OVERLAPPED ov;
4431 DWORD nread;
4432 BOOL result;
4433
4434 ZeroMemory(&ov, sizeof(ov));
4435 ov.Offset = (DWORD)offset;
4436 ov.OffsetHigh = (DWORD)(offset >> 32);
4437
4438 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4439
4440 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4441
4442 return result ? nread : 0;
4443 }
4444
4445
4446 // This method is a slightly reworked copy of JDK's sysNativePath
4447 // from src/windows/hpi/src/path_md.c
4448
4449 // Convert a pathname to native format. On win32, this involves forcing all
4450 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4451 // sometimes rejects '/') and removing redundant separators. The input path is
4452 // assumed to have been converted into the character encoding used by the local
4453 // system. Because this might be a double-byte encoding, care is taken to
4454 // treat double-byte lead characters correctly.
4455 //
4456 // This procedure modifies the given path in place, as the result is never
4457 // longer than the original. There is no error return; this operation always
4458 // succeeds.
4459 char * os::native_path(char *path) {
4460 char *src = path, *dst = path, *end = path;
4461 char *colon = NULL; // If a drive specifier is found, this will
4462 // point to the colon following the drive letter
4463
4464 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4465 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4466 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4467
4468 // Check for leading separators
4469 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4470 while (isfilesep(*src)) {
4471 src++;
4472 }
4473
4474 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4475 // Remove leading separators if followed by drive specifier. This
4476 // hack is necessary to support file URLs containing drive
4477 // specifiers (e.g., "file://c:/path"). As a side effect,
4478 // "/c:/path" can be used as an alternative to "c:/path".
4479 *dst++ = *src++;
4480 colon = dst;
4481 *dst++ = ':';
4482 src++;
4483 } else {
4484 src = path;
4485 if (isfilesep(src[0]) && isfilesep(src[1])) {
4486 // UNC pathname: Retain first separator; leave src pointed at
4487 // second separator so that further separators will be collapsed
4488 // into the second separator. The result will be a pathname
4489 // beginning with "\\\\" followed (most likely) by a host name.
4490 src = dst = path + 1;
4491 path[0] = '\\'; // Force first separator to '\\'
4492 }
4493 }
4494
4495 end = dst;
4496
4497 // Remove redundant separators from remainder of path, forcing all
4498 // separators to be '\\' rather than '/'. Also, single byte space
4499 // characters are removed from the end of the path because those
4500 // are not legal ending characters on this operating system.
4501 //
4502 while (*src != '\0') {
4503 if (isfilesep(*src)) {
4504 *dst++ = '\\'; src++;
4505 while (isfilesep(*src)) src++;
4506 if (*src == '\0') {
4507 // Check for trailing separator
4508 end = dst;
4509 if (colon == dst - 2) break; // "z:\\"
4510 if (dst == path + 1) break; // "\\"
4511 if (dst == path + 2 && isfilesep(path[0])) {
4512 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4513 // beginning of a UNC pathname. Even though it is not, by
4514 // itself, a valid UNC pathname, we leave it as is in order
4515 // to be consistent with the path canonicalizer as well
4516 // as the win32 APIs, which treat this case as an invalid
4517 // UNC pathname rather than as an alias for the root
4518 // directory of the current drive.
4519 break;
4520 }
4521 end = --dst; // Path does not denote a root directory, so
4522 // remove trailing separator
4523 break;
4524 }
4525 end = dst;
4526 } else {
4527 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4528 *dst++ = *src++;
4529 if (*src) *dst++ = *src++;
4530 end = dst;
4531 } else { // Copy a single-byte character
4532 char c = *src++;
4533 *dst++ = c;
4534 // Space is not a legal ending character
4535 if (c != ' ') end = dst;
4536 }
4537 }
4538 }
4539
4540 *end = '\0';
4541
4542 // For "z:", add "." to work around a bug in the C runtime library
4543 if (colon == dst - 1) {
4544 path[2] = '.';
4545 path[3] = '\0';
4546 }
4547
4548 return path;
4549 }
4550
4551 // This code is a copy of JDK's sysSetLength
4552 // from src/windows/hpi/src/sys_api_md.c
4553
4554 int os::ftruncate(int fd, jlong length) {
4555 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4556 long high = (long)(length >> 32);
4557 DWORD ret;
4558
4559 if (h == (HANDLE)(-1)) {
4560 return -1;
4561 }
4562
4563 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4564 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4565 return -1;
4566 }
4567
4568 if (::SetEndOfFile(h) == FALSE) {
4569 return -1;
4570 }
4571
4572 return 0;
4573 }
4574
4575
4576 // This code is a copy of JDK's sysSync
4577 // from src/windows/hpi/src/sys_api_md.c
4578 // except for the legacy workaround for a bug in Win 98
4579
4580 int os::fsync(int fd) {
4581 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4582
4583 if ((!::FlushFileBuffers(handle)) &&
4584 (GetLastError() != ERROR_ACCESS_DENIED)) {
4585 // from winerror.h
4586 return -1;
4587 }
4588 return 0;
4589 }
4590
4591 static int nonSeekAvailable(int, long *);
4592 static int stdinAvailable(int, long *);
4593
4594 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4595 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4596
4597 // This code is a copy of JDK's sysAvailable
4598 // from src/windows/hpi/src/sys_api_md.c
4599
4600 int os::available(int fd, jlong *bytes) {
4601 jlong cur, end;
4602 struct _stati64 stbuf64;
4603
4604 if (::_fstati64(fd, &stbuf64) >= 0) {
4605 int mode = stbuf64.st_mode;
4606 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4607 int ret;
4608 long lpbytes;
4609 if (fd == 0) {
4610 ret = stdinAvailable(fd, &lpbytes);
4611 } else {
4612 ret = nonSeekAvailable(fd, &lpbytes);
4613 }
4614 (*bytes) = (jlong)(lpbytes);
4615 return ret;
4616 }
4617 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4618 return FALSE;
4619 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4620 return FALSE;
4621 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4622 return FALSE;
4623 }
4624 *bytes = end - cur;
4625 return TRUE;
4626 } else {
4627 return FALSE;
4628 }
4629 }
4630
4631 // This code is a copy of JDK's nonSeekAvailable
4632 // from src/windows/hpi/src/sys_api_md.c
4633
4634 static int nonSeekAvailable(int fd, long *pbytes) {
4635 // This is used for available on non-seekable devices
4636 // (like both named and anonymous pipes, such as pipes
4637 // connected to an exec'd process).
4638 // Standard Input is a special case.
4639 HANDLE han;
4640
4641 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4642 return FALSE;
4643 }
4644
4645 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4646 // PeekNamedPipe fails when at EOF. In that case we
4647 // simply make *pbytes = 0 which is consistent with the
4648 // behavior we get on Solaris when an fd is at EOF.
4649 // The only alternative is to raise an Exception,
4650 // which isn't really warranted.
4651 //
4652 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4653 return FALSE;
4654 }
4655 *pbytes = 0;
4656 }
4657 return TRUE;
4658 }
4659
4660 #define MAX_INPUT_EVENTS 2000
4661
4662 // This code is a copy of JDK's stdinAvailable
4663 // from src/windows/hpi/src/sys_api_md.c
4664
4665 static int stdinAvailable(int fd, long *pbytes) {
4666 HANDLE han;
4667 DWORD numEventsRead = 0; // Number of events read from buffer
4668 DWORD numEvents = 0; // Number of events in buffer
4669 DWORD i = 0; // Loop index
4670 DWORD curLength = 0; // Position marker
4671 DWORD actualLength = 0; // Number of bytes readable
4672 BOOL error = FALSE; // Error holder
4673 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4674
4675 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4676 return FALSE;
4677 }
4678
4679 // Construct an array of input records in the console buffer
4680 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4681 if (error == 0) {
4682 return nonSeekAvailable(fd, pbytes);
4683 }
4684
4685 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4686 if (numEvents > MAX_INPUT_EVENTS) {
4687 numEvents = MAX_INPUT_EVENTS;
4688 }
4689
4690 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4691 if (lpBuffer == NULL) {
4692 return FALSE;
4693 }
4694
4695 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4696 if (error == 0) {
4697 os::free(lpBuffer);
4698 return FALSE;
4699 }
4700
4701 // Examine input records for the number of bytes available
4702 for (i=0; i<numEvents; i++) {
4703 if (lpBuffer[i].EventType == KEY_EVENT) {
4704
4705 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4706 &(lpBuffer[i].Event);
4707 if (keyRecord->bKeyDown == TRUE) {
4708 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4709 curLength++;
4710 if (*keyPressed == '\r') {
4711 actualLength = curLength;
4712 }
4713 }
4714 }
4715 }
4716
4717 if (lpBuffer != NULL) {
4718 os::free(lpBuffer);
4719 }
4720
4721 *pbytes = (long) actualLength;
4722 return TRUE;
4723 }
4724
4725 // Map a block of memory.
4726 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4727 char *addr, size_t bytes, bool read_only,
4728 bool allow_exec) {
4729 HANDLE hFile;
4730 char* base;
4731
4732 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4733 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4734 if (hFile == NULL) {
4735 if (PrintMiscellaneous && Verbose) {
4736 DWORD err = GetLastError();
4737 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4738 }
4739 return NULL;
4740 }
4741
4742 if (allow_exec) {
4743 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4744 // unless it comes from a PE image (which the shared archive is not.)
4745 // Even VirtualProtect refuses to give execute access to mapped memory
4746 // that was not previously executable.
4747 //
4748 // Instead, stick the executable region in anonymous memory. Yuck.
4749 // Penalty is that ~4 pages will not be shareable - in the future
4750 // we might consider DLLizing the shared archive with a proper PE
4751 // header so that mapping executable + sharing is possible.
4752
4753 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4754 PAGE_READWRITE);
4755 if (base == NULL) {
4756 if (PrintMiscellaneous && Verbose) {
4757 DWORD err = GetLastError();
4758 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4759 }
4760 CloseHandle(hFile);
4761 return NULL;
4762 }
4763
4764 DWORD bytes_read;
4765 OVERLAPPED overlapped;
4766 overlapped.Offset = (DWORD)file_offset;
4767 overlapped.OffsetHigh = 0;
4768 overlapped.hEvent = NULL;
4769 // ReadFile guarantees that if the return value is true, the requested
4770 // number of bytes were read before returning.
4771 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4772 if (!res) {
4773 if (PrintMiscellaneous && Verbose) {
4774 DWORD err = GetLastError();
4775 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4776 }
4777 release_memory(base, bytes);
4778 CloseHandle(hFile);
4779 return NULL;
4780 }
4781 } else {
4782 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4783 NULL /* file_name */);
4784 if (hMap == NULL) {
4785 if (PrintMiscellaneous && Verbose) {
4786 DWORD err = GetLastError();
4787 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4788 }
4789 CloseHandle(hFile);
4790 return NULL;
4791 }
4792
4793 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4794 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4795 (DWORD)bytes, addr);
4796 if (base == NULL) {
4797 if (PrintMiscellaneous && Verbose) {
4798 DWORD err = GetLastError();
4799 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4800 }
4801 CloseHandle(hMap);
4802 CloseHandle(hFile);
4803 return NULL;
4804 }
4805
4806 if (CloseHandle(hMap) == 0) {
4807 if (PrintMiscellaneous && Verbose) {
4808 DWORD err = GetLastError();
4809 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4810 }
4811 CloseHandle(hFile);
4812 return base;
4813 }
4814 }
4815
4816 if (allow_exec) {
4817 DWORD old_protect;
4818 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4819 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4820
4821 if (!res) {
4822 if (PrintMiscellaneous && Verbose) {
4823 DWORD err = GetLastError();
4824 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4825 }
4826 // Don't consider this a hard error, on IA32 even if the
4827 // VirtualProtect fails, we should still be able to execute
4828 CloseHandle(hFile);
4829 return base;
4830 }
4831 }
4832
4833 if (CloseHandle(hFile) == 0) {
4834 if (PrintMiscellaneous && Verbose) {
4835 DWORD err = GetLastError();
4836 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4837 }
4838 return base;
4839 }
4840
4841 return base;
4842 }
4843
4844
4845 // Remap a block of memory.
4846 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4847 char *addr, size_t bytes, bool read_only,
4848 bool allow_exec) {
4849 // This OS does not allow existing memory maps to be remapped so we
4850 // have to unmap the memory before we remap it.
4851 if (!os::unmap_memory(addr, bytes)) {
4852 return NULL;
4853 }
4854
4855 // There is a very small theoretical window between the unmap_memory()
4856 // call above and the map_memory() call below where a thread in native
4857 // code may be able to access an address that is no longer mapped.
4858
4859 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4860 read_only, allow_exec);
4861 }
4862
4863
4864 // Unmap a block of memory.
4865 // Returns true=success, otherwise false.
4866
4867 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4868 MEMORY_BASIC_INFORMATION mem_info;
4869 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4870 if (PrintMiscellaneous && Verbose) {
4871 DWORD err = GetLastError();
4872 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4873 }
4874 return false;
4875 }
4876
4877 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4878 // Instead, executable region was allocated using VirtualAlloc(). See
4879 // pd_map_memory() above.
4880 //
4881 // The following flags should match the 'exec_access' flages used for
4882 // VirtualProtect() in pd_map_memory().
4883 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4884 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4885 return pd_release_memory(addr, bytes);
4886 }
4887
4888 BOOL result = UnmapViewOfFile(addr);
4889 if (result == 0) {
4890 if (PrintMiscellaneous && Verbose) {
4891 DWORD err = GetLastError();
4892 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4893 }
4894 return false;
4895 }
4896 return true;
4897 }
4898
4899 void os::pause() {
4900 char filename[MAX_PATH];
4901 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4902 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4903 } else {
4904 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4905 }
4906
4907 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4908 if (fd != -1) {
4909 struct stat buf;
4910 ::close(fd);
4911 while (::stat(filename, &buf) == 0) {
4912 Sleep(100);
4913 }
4914 } else {
4915 jio_fprintf(stderr,
4916 "Could not open pause file '%s', continuing immediately.\n", filename);
4917 }
4918 }
4919
4920 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4921 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4922 }
4923
4924 // See the caveats for this class in os_windows.hpp
4925 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4926 // into this method and returns false. If no OS EXCEPTION was raised, returns
4927 // true.
4928 // The callback is supposed to provide the method that should be protected.
4929 //
4930 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4931 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4932 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4933 "crash_protection already set?");
4934
4935 bool success = true;
4936 __try {
4937 WatcherThread::watcher_thread()->set_crash_protection(this);
4938 cb.call();
4939 } __except(EXCEPTION_EXECUTE_HANDLER) {
4940 // only for protection, nothing to do
4941 success = false;
4942 }
4943 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4944 return success;
4945 }
4946
4947 // An Event wraps a win32 "CreateEvent" kernel handle.
4948 //
4949 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4950 //
4951 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4952 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4953 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4954 // In addition, an unpark() operation might fetch the handle field, but the
4955 // event could recycle between the fetch and the SetEvent() operation.
4956 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4957 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4958 // on an stale but recycled handle would be harmless, but in practice this might
4959 // confuse other non-Sun code, so it's not a viable approach.
4960 //
4961 // 2: Once a win32 event handle is associated with an Event, it remains associated
4962 // with the Event. The event handle is never closed. This could be construed
4963 // as handle leakage, but only up to the maximum # of threads that have been extant
4964 // at any one time. This shouldn't be an issue, as windows platforms typically
4965 // permit a process to have hundreds of thousands of open handles.
4966 //
4967 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4968 // and release unused handles.
4969 //
4970 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4971 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4972 //
4973 // 5. Use an RCU-like mechanism (Read-Copy Update).
4974 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4975 //
4976 // We use (2).
4977 //
4978 // TODO-FIXME:
4979 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4980 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4981 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4982 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4983 // into a single win32 CreateEvent() handle.
4984 //
4985 // Assumption:
4986 // Only one parker can exist on an event, which is why we allocate
4987 // them per-thread. Multiple unparkers can coexist.
4988 //
4989 // _Event transitions in park()
4990 // -1 => -1 : illegal
4991 // 1 => 0 : pass - return immediately
4992 // 0 => -1 : block; then set _Event to 0 before returning
4993 //
4994 // _Event transitions in unpark()
4995 // 0 => 1 : just return
4996 // 1 => 1 : just return
4997 // -1 => either 0 or 1; must signal target thread
4998 // That is, we can safely transition _Event from -1 to either
4999 // 0 or 1.
5000 //
5001 // _Event serves as a restricted-range semaphore.
5002 // -1 : thread is blocked, i.e. there is a waiter
5003 // 0 : neutral: thread is running or ready,
5004 // could have been signaled after a wait started
5005 // 1 : signaled - thread is running or ready
5006 //
5007 // Another possible encoding of _Event would be with
5008 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5009 //
5010
5011 int os::PlatformEvent::park(jlong Millis) {
5012 // Transitions for _Event:
5013 // -1 => -1 : illegal
5014 // 1 => 0 : pass - return immediately
5015 // 0 => -1 : block; then set _Event to 0 before returning
5016
5017 guarantee(_ParkHandle != NULL , "Invariant");
5018 guarantee(Millis > 0 , "Invariant");
5019
5020 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5021 // the initial park() operation.
5022 // Consider: use atomic decrement instead of CAS-loop
5023
5024 int v;
5025 for (;;) {
5026 v = _Event;
5027 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5028 }
5029 guarantee((v == 0) || (v == 1), "invariant");
5030 if (v != 0) return OS_OK;
5031
5032 // Do this the hard way by blocking ...
5033 // TODO: consider a brief spin here, gated on the success of recent
5034 // spin attempts by this thread.
5035 //
5036 // We decompose long timeouts into series of shorter timed waits.
5037 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5038 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5039 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5040 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5041 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5042 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5043 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5044 // for the already waited time. This policy does not admit any new outcomes.
5045 // In the future, however, we might want to track the accumulated wait time and
5046 // adjust Millis accordingly if we encounter a spurious wakeup.
5047
5048 const int MAXTIMEOUT = 0x10000000;
5049 DWORD rv = WAIT_TIMEOUT;
5050 while (_Event < 0 && Millis > 0) {
5051 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5052 if (Millis > MAXTIMEOUT) {
5053 prd = MAXTIMEOUT;
5054 }
5055 rv = ::WaitForSingleObject(_ParkHandle, prd);
5056 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5057 if (rv == WAIT_TIMEOUT) {
5058 Millis -= prd;
5059 }
5060 }
5061 v = _Event;
5062 _Event = 0;
5063 // see comment at end of os::PlatformEvent::park() below:
5064 OrderAccess::fence();
5065 // If we encounter a nearly simultanous timeout expiry and unpark()
5066 // we return OS_OK indicating we awoke via unpark().
5067 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5068 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5069 }
5070
5071 void os::PlatformEvent::park() {
5072 // Transitions for _Event:
5073 // -1 => -1 : illegal
5074 // 1 => 0 : pass - return immediately
5075 // 0 => -1 : block; then set _Event to 0 before returning
5076
5077 guarantee(_ParkHandle != NULL, "Invariant");
5078 // Invariant: Only the thread associated with the Event/PlatformEvent
5079 // may call park().
5080 // Consider: use atomic decrement instead of CAS-loop
5081 int v;
5082 for (;;) {
5083 v = _Event;
5084 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5085 }
5086 guarantee((v == 0) || (v == 1), "invariant");
5087 if (v != 0) return;
5088
5089 // Do this the hard way by blocking ...
5090 // TODO: consider a brief spin here, gated on the success of recent
5091 // spin attempts by this thread.
5092 while (_Event < 0) {
5093 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5094 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5095 }
5096
5097 // Usually we'll find _Event == 0 at this point, but as
5098 // an optional optimization we clear it, just in case can
5099 // multiple unpark() operations drove _Event up to 1.
5100 _Event = 0;
5101 OrderAccess::fence();
5102 guarantee(_Event >= 0, "invariant");
5103 }
5104
5105 void os::PlatformEvent::unpark() {
5106 guarantee(_ParkHandle != NULL, "Invariant");
5107
5108 // Transitions for _Event:
5109 // 0 => 1 : just return
5110 // 1 => 1 : just return
5111 // -1 => either 0 or 1; must signal target thread
5112 // That is, we can safely transition _Event from -1 to either
5113 // 0 or 1.
5114 // See also: "Semaphores in Plan 9" by Mullender & Cox
5115 //
5116 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5117 // that it will take two back-to-back park() calls for the owning
5118 // thread to block. This has the benefit of forcing a spurious return
5119 // from the first park() call after an unpark() call which will help
5120 // shake out uses of park() and unpark() without condition variables.
5121
5122 if (Atomic::xchg(1, &_Event) >= 0) return;
5123
5124 ::SetEvent(_ParkHandle);
5125 }
5126
5127
5128 // JSR166
5129 // -------------------------------------------------------
5130
5131 // The Windows implementation of Park is very straightforward: Basic
5132 // operations on Win32 Events turn out to have the right semantics to
5133 // use them directly. We opportunistically resuse the event inherited
5134 // from Monitor.
5135
5136 void Parker::park(bool isAbsolute, jlong time) {
5137 guarantee(_ParkEvent != NULL, "invariant");
5138 // First, demultiplex/decode time arguments
5139 if (time < 0) { // don't wait
5140 return;
5141 } else if (time == 0 && !isAbsolute) {
5142 time = INFINITE;
5143 } else if (isAbsolute) {
5144 time -= os::javaTimeMillis(); // convert to relative time
5145 if (time <= 0) { // already elapsed
5146 return;
5147 }
5148 } else { // relative
5149 time /= 1000000; // Must coarsen from nanos to millis
5150 if (time == 0) { // Wait for the minimal time unit if zero
5151 time = 1;
5152 }
5153 }
5154
5155 JavaThread* thread = (JavaThread*)(Thread::current());
5156 assert(thread->is_Java_thread(), "Must be JavaThread");
5157 JavaThread *jt = (JavaThread *)thread;
5158
5159 // Don't wait if interrupted or already triggered
5160 if (Thread::is_interrupted(thread, false) ||
5161 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5162 ResetEvent(_ParkEvent);
5163 return;
5164 } else {
5165 ThreadBlockInVM tbivm(jt);
5166 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5167 jt->set_suspend_equivalent();
5168
5169 WaitForSingleObject(_ParkEvent, time);
5170 ResetEvent(_ParkEvent);
5171
5172 // If externally suspended while waiting, re-suspend
5173 if (jt->handle_special_suspend_equivalent_condition()) {
5174 jt->java_suspend_self();
5175 }
5176 }
5177 }
5178
5179 void Parker::unpark() {
5180 guarantee(_ParkEvent != NULL, "invariant");
5181 SetEvent(_ParkEvent);
5182 }
5183
5184 // Run the specified command in a separate process. Return its exit value,
5185 // or -1 on failure (e.g. can't create a new process).
5186 int os::fork_and_exec(char* cmd) {
5187 STARTUPINFO si;
5188 PROCESS_INFORMATION pi;
5189
5190 memset(&si, 0, sizeof(si));
5191 si.cb = sizeof(si);
5192 memset(&pi, 0, sizeof(pi));
5193 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5194 cmd, // command line
5195 NULL, // process security attribute
5196 NULL, // thread security attribute
5197 TRUE, // inherits system handles
5198 0, // no creation flags
5199 NULL, // use parent's environment block
5200 NULL, // use parent's starting directory
5201 &si, // (in) startup information
5202 &pi); // (out) process information
5203
5204 if (rslt) {
5205 // Wait until child process exits.
5206 WaitForSingleObject(pi.hProcess, INFINITE);
5207
5208 DWORD exit_code;
5209 GetExitCodeProcess(pi.hProcess, &exit_code);
5210
5211 // Close process and thread handles.
5212 CloseHandle(pi.hProcess);
5213 CloseHandle(pi.hThread);
5214
5215 return (int)exit_code;
5216 } else {
5217 return -1;
5218 }
5219 }
5220
5221 //--------------------------------------------------------------------------------------------------
5222 // Non-product code
5223
5224 static int mallocDebugIntervalCounter = 0;
5225 static int mallocDebugCounter = 0;
5226 bool os::check_heap(bool force) {
5227 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5228 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5229 // Note: HeapValidate executes two hardware breakpoints when it finds something
5230 // wrong; at these points, eax contains the address of the offending block (I think).
5231 // To get to the exlicit error message(s) below, just continue twice.
5232 HANDLE heap = GetProcessHeap();
5233
5234 // If we fail to lock the heap, then gflags.exe has been used
5235 // or some other special heap flag has been set that prevents
5236 // locking. We don't try to walk a heap we can't lock.
5237 if (HeapLock(heap) != 0) {
5238 PROCESS_HEAP_ENTRY phe;
5239 phe.lpData = NULL;
5240 while (HeapWalk(heap, &phe) != 0) {
5241 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5242 !HeapValidate(heap, 0, phe.lpData)) {
5243 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5244 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5245 fatal("corrupted C heap");
5246 }
5247 }
5248 DWORD err = GetLastError();
5249 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5250 fatal("heap walk aborted with error %d", err);
5251 }
5252 HeapUnlock(heap);
5253 }
5254 mallocDebugIntervalCounter = 0;
5255 }
5256 return true;
5257 }
5258
5259
5260 bool os::find(address addr, outputStream* st) {
5261 // Nothing yet
5262 return false;
5263 }
5264
5265 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5266 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5267
5268 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5269 JavaThread* thread = JavaThread::current();
5270 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5271 address addr = (address) exceptionRecord->ExceptionInformation[1];
5272
5273 if (os::is_memory_serialize_page(thread, addr)) {
5274 return EXCEPTION_CONTINUE_EXECUTION;
5275 }
5276 }
5277
5278 return EXCEPTION_CONTINUE_SEARCH;
5279 }
5280
5281 // We don't build a headless jre for Windows
5282 bool os::is_headless_jre() { return false; }
5283
5284 static jint initSock() {
5285 WSADATA wsadata;
5286
5287 if (!os::WinSock2Dll::WinSock2Available()) {
5288 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5289 ::GetLastError());
5290 return JNI_ERR;
5291 }
5292
5293 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5294 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5295 ::GetLastError());
5296 return JNI_ERR;
5297 }
5298 return JNI_OK;
5299 }
5300
5301 struct hostent* os::get_host_by_name(char* name) {
5302 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5303 }
5304
5305 int os::socket_close(int fd) {
5306 return ::closesocket(fd);
5307 }
5308
5309 int os::socket(int domain, int type, int protocol) {
5310 return ::socket(domain, type, protocol);
5311 }
5312
5313 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5314 return ::connect(fd, him, len);
5315 }
5316
5317 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5318 return ::recv(fd, buf, (int)nBytes, flags);
5319 }
5320
5321 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5322 return ::send(fd, buf, (int)nBytes, flags);
5323 }
5324
5325 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5326 return ::send(fd, buf, (int)nBytes, flags);
5327 }
5328
5329 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5330 #if defined(IA32)
5331 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5332 #elif defined (AMD64)
5333 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5334 #endif
5335
5336 // returns true if thread could be suspended,
5337 // false otherwise
5338 static bool do_suspend(HANDLE* h) {
5339 if (h != NULL) {
5340 if (SuspendThread(*h) != ~0) {
5341 return true;
5342 }
5343 }
5344 return false;
5345 }
5346
5347 // resume the thread
5348 // calling resume on an active thread is a no-op
5349 static void do_resume(HANDLE* h) {
5350 if (h != NULL) {
5351 ResumeThread(*h);
5352 }
5353 }
5354
5355 // retrieve a suspend/resume context capable handle
5356 // from the tid. Caller validates handle return value.
5357 void get_thread_handle_for_extended_context(HANDLE* h,
5358 OSThread::thread_id_t tid) {
5359 if (h != NULL) {
5360 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5361 }
5362 }
5363
5364 // Thread sampling implementation
5365 //
5366 void os::SuspendedThreadTask::internal_do_task() {
5367 CONTEXT ctxt;
5368 HANDLE h = NULL;
5369
5370 // get context capable handle for thread
5371 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5372
5373 // sanity
5374 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5375 return;
5376 }
5377
5378 // suspend the thread
5379 if (do_suspend(&h)) {
5380 ctxt.ContextFlags = sampling_context_flags;
5381 // get thread context
5382 GetThreadContext(h, &ctxt);
5383 SuspendedThreadTaskContext context(_thread, &ctxt);
5384 // pass context to Thread Sampling impl
5385 do_task(context);
5386 // resume thread
5387 do_resume(&h);
5388 }
5389
5390 // close handle
5391 CloseHandle(h);
5392 }
5393
5394
5395 // Kernel32 API
5396 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5397 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5398 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5399 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5400 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5401
5402 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5403 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5404 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5405 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5406 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5407
5408
5409 BOOL os::Kernel32Dll::initialized = FALSE;
5410 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5411 assert(initialized && _GetLargePageMinimum != NULL,
5412 "GetLargePageMinimumAvailable() not yet called");
5413 return _GetLargePageMinimum();
5414 }
5415
5416 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5417 if (!initialized) {
5418 initialize();
5419 }
5420 return _GetLargePageMinimum != NULL;
5421 }
5422
5423 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5424 if (!initialized) {
5425 initialize();
5426 }
5427 return _VirtualAllocExNuma != NULL;
5428 }
5429
5430 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5431 SIZE_T bytes, DWORD flags,
5432 DWORD prot, DWORD node) {
5433 assert(initialized && _VirtualAllocExNuma != NULL,
5434 "NUMACallsAvailable() not yet called");
5435
5436 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5437 }
5438
5439 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5440 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5441 "NUMACallsAvailable() not yet called");
5442
5443 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5444 }
5445
5446 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5447 PULONGLONG proc_mask) {
5448 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5449 "NUMACallsAvailable() not yet called");
5450
5451 return _GetNumaNodeProcessorMask(node, proc_mask);
5452 }
5453
5454 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5455 ULONG FrameToCapture,
5456 PVOID* BackTrace,
5457 PULONG BackTraceHash) {
5458 if (!initialized) {
5459 initialize();
5460 }
5461
5462 if (_RtlCaptureStackBackTrace != NULL) {
5463 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5464 BackTrace, BackTraceHash);
5465 } else {
5466 return 0;
5467 }
5468 }
5469
5470 void os::Kernel32Dll::initializeCommon() {
5471 if (!initialized) {
5472 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5473 assert(handle != NULL, "Just check");
5474 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5475 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5476 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5477 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5478 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5479 initialized = TRUE;
5480 }
5481 }
5482
5483
5484
5485 #ifndef JDK6_OR_EARLIER
5486
5487 void os::Kernel32Dll::initialize() {
5488 initializeCommon();
5489 }
5490
5491
5492 // Kernel32 API
5493 inline BOOL os::Kernel32Dll::SwitchToThread() {
5494 return ::SwitchToThread();
5495 }
5496
5497 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5498 return true;
5499 }
5500
5501 // Help tools
5502 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5503 return true;
5504 }
5505
5506 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5507 DWORD th32ProcessId) {
5508 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5509 }
5510
5511 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5512 LPMODULEENTRY32 lpme) {
5513 return ::Module32First(hSnapshot, lpme);
5514 }
5515
5516 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5517 LPMODULEENTRY32 lpme) {
5518 return ::Module32Next(hSnapshot, lpme);
5519 }
5520
5521 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5522 ::GetNativeSystemInfo(lpSystemInfo);
5523 }
5524
5525 // PSAPI API
5526 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5527 HMODULE *lpModule, DWORD cb,
5528 LPDWORD lpcbNeeded) {
5529 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5530 }
5531
5532 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5533 HMODULE hModule,
5534 LPTSTR lpFilename,
5535 DWORD nSize) {
5536 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5537 }
5538
5539 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5540 HMODULE hModule,
5541 LPMODULEINFO lpmodinfo,
5542 DWORD cb) {
5543 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5544 }
5545
5546 inline BOOL os::PSApiDll::PSApiAvailable() {
5547 return true;
5548 }
5549
5550
5551 // WinSock2 API
5552 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5553 LPWSADATA lpWSAData) {
5554 return ::WSAStartup(wVersionRequested, lpWSAData);
5555 }
5556
5557 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5558 return ::gethostbyname(name);
5559 }
5560
5561 inline BOOL os::WinSock2Dll::WinSock2Available() {
5562 return true;
5563 }
5564
5565 // Advapi API
5566 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5567 BOOL DisableAllPrivileges,
5568 PTOKEN_PRIVILEGES NewState,
5569 DWORD BufferLength,
5570 PTOKEN_PRIVILEGES PreviousState,
5571 PDWORD ReturnLength) {
5572 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5573 BufferLength, PreviousState, ReturnLength);
5574 }
5575
5576 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5577 DWORD DesiredAccess,
5578 PHANDLE TokenHandle) {
5579 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5580 }
5581
5582 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5583 LPCTSTR lpName,
5584 PLUID lpLuid) {
5585 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5586 }
5587
5588 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5589 return true;
5590 }
5591
5592 void* os::get_default_process_handle() {
5593 return (void*)GetModuleHandle(NULL);
5594 }
5595
5596 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5597 // which is used to find statically linked in agents.
5598 // Additionally for windows, takes into account __stdcall names.
5599 // Parameters:
5600 // sym_name: Symbol in library we are looking for
5601 // lib_name: Name of library to look in, NULL for shared libs.
5602 // is_absolute_path == true if lib_name is absolute path to agent
5603 // such as "C:/a/b/L.dll"
5604 // == false if only the base name of the library is passed in
5605 // such as "L"
5606 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5607 bool is_absolute_path) {
5608 char *agent_entry_name;
5609 size_t len;
5610 size_t name_len;
5611 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5612 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5613 const char *start;
5614
5615 if (lib_name != NULL) {
5616 len = name_len = strlen(lib_name);
5617 if (is_absolute_path) {
5618 // Need to strip path, prefix and suffix
5619 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5620 lib_name = ++start;
5621 } else {
5622 // Need to check for drive prefix
5623 if ((start = strchr(lib_name, ':')) != NULL) {
5624 lib_name = ++start;
5625 }
5626 }
5627 if (len <= (prefix_len + suffix_len)) {
5628 return NULL;
5629 }
5630 lib_name += prefix_len;
5631 name_len = strlen(lib_name) - suffix_len;
5632 }
5633 }
5634 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5635 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5636 if (agent_entry_name == NULL) {
5637 return NULL;
5638 }
5639 if (lib_name != NULL) {
5640 const char *p = strrchr(sym_name, '@');
5641 if (p != NULL && p != sym_name) {
5642 // sym_name == _Agent_OnLoad@XX
5643 strncpy(agent_entry_name, sym_name, (p - sym_name));
5644 agent_entry_name[(p-sym_name)] = '\0';
5645 // agent_entry_name == _Agent_OnLoad
5646 strcat(agent_entry_name, "_");
5647 strncat(agent_entry_name, lib_name, name_len);
5648 strcat(agent_entry_name, p);
5649 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5650 } else {
5651 strcpy(agent_entry_name, sym_name);
5652 strcat(agent_entry_name, "_");
5653 strncat(agent_entry_name, lib_name, name_len);
5654 }
5655 } else {
5656 strcpy(agent_entry_name, sym_name);
5657 }
5658 return agent_entry_name;
5659 }
5660
5661 #else
5662 // Kernel32 API
5663 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5664 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5665 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5666 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5667 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5668
5669 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5670 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5671 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5672 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5673 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5674
5675 void os::Kernel32Dll::initialize() {
5676 if (!initialized) {
5677 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5678 assert(handle != NULL, "Just check");
5679
5680 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5681 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5682 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5683 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5684 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5685 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5686 initializeCommon(); // resolve the functions that always need resolving
5687
5688 initialized = TRUE;
5689 }
5690 }
5691
5692 BOOL os::Kernel32Dll::SwitchToThread() {
5693 assert(initialized && _SwitchToThread != NULL,
5694 "SwitchToThreadAvailable() not yet called");
5695 return _SwitchToThread();
5696 }
5697
5698
5699 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5700 if (!initialized) {
5701 initialize();
5702 }
5703 return _SwitchToThread != NULL;
5704 }
5705
5706 // Help tools
5707 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5708 if (!initialized) {
5709 initialize();
5710 }
5711 return _CreateToolhelp32Snapshot != NULL &&
5712 _Module32First != NULL &&
5713 _Module32Next != NULL;
5714 }
5715
5716 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5717 DWORD th32ProcessId) {
5718 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5719 "HelpToolsAvailable() not yet called");
5720
5721 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5722 }
5723
5724 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5725 assert(initialized && _Module32First != NULL,
5726 "HelpToolsAvailable() not yet called");
5727
5728 return _Module32First(hSnapshot, lpme);
5729 }
5730
5731 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5732 LPMODULEENTRY32 lpme) {
5733 assert(initialized && _Module32Next != NULL,
5734 "HelpToolsAvailable() not yet called");
5735
5736 return _Module32Next(hSnapshot, lpme);
5737 }
5738
5739
5740 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5741 if (!initialized) {
5742 initialize();
5743 }
5744 return _GetNativeSystemInfo != NULL;
5745 }
5746
5747 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5748 assert(initialized && _GetNativeSystemInfo != NULL,
5749 "GetNativeSystemInfoAvailable() not yet called");
5750
5751 _GetNativeSystemInfo(lpSystemInfo);
5752 }
5753
5754 // PSAPI API
5755
5756
5757 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5758 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5759 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5760
5761 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5762 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5763 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5764 BOOL os::PSApiDll::initialized = FALSE;
5765
5766 void os::PSApiDll::initialize() {
5767 if (!initialized) {
5768 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5769 if (handle != NULL) {
5770 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5771 "EnumProcessModules");
5772 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5773 "GetModuleFileNameExA");
5774 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5775 "GetModuleInformation");
5776 }
5777 initialized = TRUE;
5778 }
5779 }
5780
5781
5782
5783 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5784 DWORD cb, LPDWORD lpcbNeeded) {
5785 assert(initialized && _EnumProcessModules != NULL,
5786 "PSApiAvailable() not yet called");
5787 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5788 }
5789
5790 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5791 LPTSTR lpFilename, DWORD nSize) {
5792 assert(initialized && _GetModuleFileNameEx != NULL,
5793 "PSApiAvailable() not yet called");
5794 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5795 }
5796
5797 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5798 LPMODULEINFO lpmodinfo, DWORD cb) {
5799 assert(initialized && _GetModuleInformation != NULL,
5800 "PSApiAvailable() not yet called");
5801 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5802 }
5803
5804 BOOL os::PSApiDll::PSApiAvailable() {
5805 if (!initialized) {
5806 initialize();
5807 }
5808 return _EnumProcessModules != NULL &&
5809 _GetModuleFileNameEx != NULL &&
5810 _GetModuleInformation != NULL;
5811 }
5812
5813
5814 // WinSock2 API
5815 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5816 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5817
5818 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5819 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5820 BOOL os::WinSock2Dll::initialized = FALSE;
5821
5822 void os::WinSock2Dll::initialize() {
5823 if (!initialized) {
5824 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5825 if (handle != NULL) {
5826 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5827 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5828 }
5829 initialized = TRUE;
5830 }
5831 }
5832
5833
5834 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5835 assert(initialized && _WSAStartup != NULL,
5836 "WinSock2Available() not yet called");
5837 return _WSAStartup(wVersionRequested, lpWSAData);
5838 }
5839
5840 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5841 assert(initialized && _gethostbyname != NULL,
5842 "WinSock2Available() not yet called");
5843 return _gethostbyname(name);
5844 }
5845
5846 BOOL os::WinSock2Dll::WinSock2Available() {
5847 if (!initialized) {
5848 initialize();
5849 }
5850 return _WSAStartup != NULL &&
5851 _gethostbyname != NULL;
5852 }
5853
5854 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5855 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5856 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5857
5858 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5859 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5860 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5861 BOOL os::Advapi32Dll::initialized = FALSE;
5862
5863 void os::Advapi32Dll::initialize() {
5864 if (!initialized) {
5865 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5866 if (handle != NULL) {
5867 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5868 "AdjustTokenPrivileges");
5869 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5870 "OpenProcessToken");
5871 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5872 "LookupPrivilegeValueA");
5873 }
5874 initialized = TRUE;
5875 }
5876 }
5877
5878 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5879 BOOL DisableAllPrivileges,
5880 PTOKEN_PRIVILEGES NewState,
5881 DWORD BufferLength,
5882 PTOKEN_PRIVILEGES PreviousState,
5883 PDWORD ReturnLength) {
5884 assert(initialized && _AdjustTokenPrivileges != NULL,
5885 "AdvapiAvailable() not yet called");
5886 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5887 BufferLength, PreviousState, ReturnLength);
5888 }
5889
5890 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5891 DWORD DesiredAccess,
5892 PHANDLE TokenHandle) {
5893 assert(initialized && _OpenProcessToken != NULL,
5894 "AdvapiAvailable() not yet called");
5895 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5896 }
5897
5898 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5899 LPCTSTR lpName, PLUID lpLuid) {
5900 assert(initialized && _LookupPrivilegeValue != NULL,
5901 "AdvapiAvailable() not yet called");
5902 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5903 }
5904
5905 BOOL os::Advapi32Dll::AdvapiAvailable() {
5906 if (!initialized) {
5907 initialize();
5908 }
5909 return _AdjustTokenPrivileges != NULL &&
5910 _OpenProcessToken != NULL &&
5911 _LookupPrivilegeValue != NULL;
5912 }
5913
5914 #endif
5915
5916 #ifndef PRODUCT
5917
5918 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5919 // contiguous memory block at a particular address.
5920 // The test first tries to find a good approximate address to allocate at by using the same
5921 // method to allocate some memory at any address. The test then tries to allocate memory in
5922 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5923 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5924 // the previously allocated memory is available for allocation. The only actual failure
5925 // that is reported is when the test tries to allocate at a particular location but gets a
5926 // different valid one. A NULL return value at this point is not considered an error but may
5927 // be legitimate.
5928 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5929 void TestReserveMemorySpecial_test() {
5930 if (!UseLargePages) {
5931 if (VerboseInternalVMTests) {
5932 gclog_or_tty->print("Skipping test because large pages are disabled");
5933 }
5934 return;
5935 }
5936 // save current value of globals
5937 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5938 bool old_use_numa_interleaving = UseNUMAInterleaving;
5939
5940 // set globals to make sure we hit the correct code path
5941 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5942
5943 // do an allocation at an address selected by the OS to get a good one.
5944 const size_t large_allocation_size = os::large_page_size() * 4;
5945 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5946 if (result == NULL) {
5947 if (VerboseInternalVMTests) {
5948 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5949 large_allocation_size);
5950 }
5951 } else {
5952 os::release_memory_special(result, large_allocation_size);
5953
5954 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5955 // we managed to get it once.
5956 const size_t expected_allocation_size = os::large_page_size();
5957 char* expected_location = result + os::large_page_size();
5958 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5959 if (actual_location == NULL) {
5960 if (VerboseInternalVMTests) {
5961 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5962 expected_location, large_allocation_size);
5963 }
5964 } else {
5965 // release memory
5966 os::release_memory_special(actual_location, expected_allocation_size);
5967 // only now check, after releasing any memory to avoid any leaks.
5968 assert(actual_location == expected_location,
5969 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5970 expected_location, expected_allocation_size, actual_location);
5971 }
5972 }
5973
5974 // restore globals
5975 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5976 UseNUMAInterleaving = old_use_numa_interleaving;
5977 }
5978 #endif // PRODUCT
5979
5980 // Fast current thread access
5981
5982 int os::win32::_thread_ptr_offset = 0;
5983
5984 static void call_wrapper_dummy() {}
5985
5986 // We need to call the os_exception_wrapper once so that it sets
5987 // up the offset from FS of the thread pointer.
5988 void os::win32::initialize_thread_ptr_offset() {
5989 os::os_exception_wrapper( (java_call_t)call_wrapper_dummy,
5990 NULL, NULL, NULL, NULL);
5991 }