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 #if _MSC_VER >= 1900
96 #pragma warning( disable : 4091 ) // typedef ignored on left when no variable is declared
97 #endif
98 #include <imagehlp.h> // For os::dll_address_to_function_name
99 // for enumerating dll libraries
100 #include <vdmdbg.h>
101
102 // for timer info max values which include all bits
103 #define ALL_64_BITS CONST64(-1)
104
105 // For DLL loading/load error detection
106 // Values of PE COFF
107 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
108 #define IMAGE_FILE_SIGNATURE_LENGTH 4
109
110 static HANDLE main_process;
111 static HANDLE main_thread;
112 static int main_thread_id;
113
114 static FILETIME process_creation_time;
115 static FILETIME process_exit_time;
116 static FILETIME process_user_time;
117 static FILETIME process_kernel_time;
118
119 #ifdef _M_IA64
120 #define __CPU__ ia64
121 #else
122 #ifdef _M_AMD64
123 #define __CPU__ amd64
124 #else
125 #define __CPU__ i486
126 #endif
127 #endif
128
129 // save DLL module handle, used by GetModuleFileName
130
131 HINSTANCE vm_lib_handle;
132
133 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
134 switch (reason) {
135 case DLL_PROCESS_ATTACH:
136 vm_lib_handle = hinst;
137 if (ForceTimeHighResolution) {
138 timeBeginPeriod(1L);
139 }
140 break;
141 case DLL_PROCESS_DETACH:
142 if (ForceTimeHighResolution) {
143 timeEndPeriod(1L);
144 }
145 break;
146 default:
147 break;
148 }
149 return true;
150 }
151
152 static inline double fileTimeAsDouble(FILETIME* time) {
153 const double high = (double) ((unsigned int) ~0);
154 const double split = 10000000.0;
155 double result = (time->dwLowDateTime / split) +
156 time->dwHighDateTime * (high/split);
157 return result;
158 }
159
160 // Implementation of os
161
162 bool os::unsetenv(const char* name) {
163 assert(name != NULL, "Null pointer");
164 return (SetEnvironmentVariable(name, NULL) == TRUE);
165 }
166
167 // No setuid programs under Windows.
168 bool os::have_special_privileges() {
169 return false;
170 }
171
172
173 // This method is a periodic task to check for misbehaving JNI applications
174 // under CheckJNI, we can add any periodic checks here.
175 // For Windows at the moment does nothing
176 void os::run_periodic_checks() {
177 return;
178 }
179
180 // previous UnhandledExceptionFilter, if there is one
181 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
182
183 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
184
185 void os::init_system_properties_values() {
186 // sysclasspath, java_home, dll_dir
187 {
188 char *home_path;
189 char *dll_path;
190 char *pslash;
191 char *bin = "\\bin";
192 char home_dir[MAX_PATH + 1];
193 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
194
195 if (alt_home_dir != NULL) {
196 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
197 home_dir[MAX_PATH] = '\0';
198 } else {
199 os::jvm_path(home_dir, sizeof(home_dir));
200 // Found the full path to jvm.dll.
201 // Now cut the path to <java_home>/jre if we can.
202 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \{client|server}
206 pslash = strrchr(home_dir, '\\');
207 if (pslash != NULL) {
208 *pslash = '\0'; // get rid of \bin
209 }
210 }
211 }
212
213 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
214 if (home_path == NULL) {
215 return;
216 }
217 strcpy(home_path, home_dir);
218 Arguments::set_java_home(home_path);
219 FREE_C_HEAP_ARRAY(char, home_path);
220
221 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
222 mtInternal);
223 if (dll_path == NULL) {
224 return;
225 }
226 strcpy(dll_path, home_dir);
227 strcat(dll_path, bin);
228 Arguments::set_dll_dir(dll_path);
229 FREE_C_HEAP_ARRAY(char, dll_path);
230
231 if (!set_boot_path('\\', ';')) {
232 return;
233 }
234 }
235
236 // library_path
237 #define EXT_DIR "\\lib\\ext"
238 #define BIN_DIR "\\bin"
239 #define PACKAGE_DIR "\\Sun\\Java"
240 {
241 // Win32 library search order (See the documentation for LoadLibrary):
242 //
243 // 1. The directory from which application is loaded.
244 // 2. The system wide Java Extensions directory (Java only)
245 // 3. System directory (GetSystemDirectory)
246 // 4. Windows directory (GetWindowsDirectory)
247 // 5. The PATH environment variable
248 // 6. The current directory
249
250 char *library_path;
251 char tmp[MAX_PATH];
252 char *path_str = ::getenv("PATH");
253
254 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
255 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
256
257 library_path[0] = '\0';
258
259 GetModuleFileName(NULL, tmp, sizeof(tmp));
260 *(strrchr(tmp, '\\')) = '\0';
261 strcat(library_path, tmp);
262
263 GetWindowsDirectory(tmp, sizeof(tmp));
264 strcat(library_path, ";");
265 strcat(library_path, tmp);
266 strcat(library_path, PACKAGE_DIR BIN_DIR);
267
268 GetSystemDirectory(tmp, sizeof(tmp));
269 strcat(library_path, ";");
270 strcat(library_path, tmp);
271
272 GetWindowsDirectory(tmp, sizeof(tmp));
273 strcat(library_path, ";");
274 strcat(library_path, tmp);
275
276 if (path_str) {
277 strcat(library_path, ";");
278 strcat(library_path, path_str);
279 }
280
281 strcat(library_path, ";.");
282
283 Arguments::set_library_path(library_path);
284 FREE_C_HEAP_ARRAY(char, library_path);
285 }
286
287 // Default extensions directory
288 {
289 char path[MAX_PATH];
290 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
291 GetWindowsDirectory(path, MAX_PATH);
292 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
293 path, PACKAGE_DIR, EXT_DIR);
294 Arguments::set_ext_dirs(buf);
295 }
296 #undef EXT_DIR
297 #undef BIN_DIR
298 #undef PACKAGE_DIR
299
300 #ifndef _WIN64
301 // set our UnhandledExceptionFilter and save any previous one
302 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
303 #endif
304
305 // Done
306 return;
307 }
308
309 void os::breakpoint() {
310 DebugBreak();
311 }
312
313 // Invoked from the BREAKPOINT Macro
314 extern "C" void breakpoint() {
315 os::breakpoint();
316 }
317
318 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
319 // So far, this method is only used by Native Memory Tracking, which is
320 // only supported on Windows XP or later.
321 //
322 int os::get_native_stack(address* stack, int frames, int toSkip) {
323 #ifdef _NMT_NOINLINE_
324 toSkip++;
325 #endif
326 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
327 (PVOID*)stack, NULL);
328 for (int index = captured; index < frames; index ++) {
329 stack[index] = NULL;
330 }
331 return captured;
332 }
333
334
335 // os::current_stack_base()
336 //
337 // Returns the base of the stack, which is the stack's
338 // starting address. This function must be called
339 // while running on the stack of the thread being queried.
340
341 address os::current_stack_base() {
342 MEMORY_BASIC_INFORMATION minfo;
343 address stack_bottom;
344 size_t stack_size;
345
346 VirtualQuery(&minfo, &minfo, sizeof(minfo));
347 stack_bottom = (address)minfo.AllocationBase;
348 stack_size = minfo.RegionSize;
349
350 // Add up the sizes of all the regions with the same
351 // AllocationBase.
352 while (1) {
353 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
354 if (stack_bottom == (address)minfo.AllocationBase) {
355 stack_size += minfo.RegionSize;
356 } else {
357 break;
358 }
359 }
360
361 #ifdef _M_IA64
362 // IA64 has memory and register stacks
363 //
364 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
365 // at thread creation (1MB backing store growing upwards, 1MB memory stack
366 // growing downwards, 2MB summed up)
367 //
368 // ...
369 // ------- top of stack (high address) -----
370 // |
371 // | 1MB
372 // | Backing Store (Register Stack)
373 // |
374 // | / \
375 // | |
376 // | |
377 // | |
378 // ------------------------ stack base -----
379 // | 1MB
380 // | Memory Stack
381 // |
382 // | |
383 // | |
384 // | |
385 // | \ /
386 // |
387 // ----- bottom of stack (low address) -----
388 // ...
389
390 stack_size = stack_size / 2;
391 #endif
392 return stack_bottom + stack_size;
393 }
394
395 size_t os::current_stack_size() {
396 size_t sz;
397 MEMORY_BASIC_INFORMATION minfo;
398 VirtualQuery(&minfo, &minfo, sizeof(minfo));
399 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
400 return sz;
401 }
402
403 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
404 const struct tm* time_struct_ptr = localtime(clock);
405 if (time_struct_ptr != NULL) {
406 *res = *time_struct_ptr;
407 return res;
408 }
409 return NULL;
410 }
411
412 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
413
414 // Thread start routine for all new Java threads
415 static unsigned __stdcall java_start(Thread* thread) {
416 // Try to randomize the cache line index of hot stack frames.
417 // This helps when threads of the same stack traces evict each other's
418 // cache lines. The threads can be either from the same JVM instance, or
419 // from different JVM instances. The benefit is especially true for
420 // processors with hyperthreading technology.
421 static int counter = 0;
422 int pid = os::current_process_id();
423 _alloca(((pid ^ counter++) & 7) * 128);
424
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
427
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
434
435 // Diagnostic code to investigate JDK-6573254
436 int res = 30115; // non-java thread
437 if (thread->is_Java_thread()) {
438 res = 20115; // java thread
439 }
440
441 // Install a win32 structured exception handler around every thread created
442 // by VM, so VM can generate error dump when an exception occurred in non-
443 // Java thread (e.g. VM thread).
444 __try {
445 thread->run();
446 } __except(topLevelExceptionFilter(
447 (_EXCEPTION_POINTERS*)_exception_info())) {
448 // Nothing to do.
449 }
450
451 // One less thread is executing
452 // When the VMThread gets here, the main thread may have already exited
453 // which frees the CodeHeap containing the Atomic::add code
454 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
455 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
456 }
457
458 // Thread must not return from exit_process_or_thread(), but if it does,
459 // let it proceed to exit normally
460 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
461 }
462
463 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
464 int thread_id) {
465 // Allocate the OSThread object
466 OSThread* osthread = new OSThread(NULL, NULL);
467 if (osthread == NULL) return NULL;
468
469 // Initialize support for Java interrupts
470 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
471 if (interrupt_event == NULL) {
472 delete osthread;
473 return NULL;
474 }
475 osthread->set_interrupt_event(interrupt_event);
476
477 // Store info on the Win32 thread into the OSThread
478 osthread->set_thread_handle(thread_handle);
479 osthread->set_thread_id(thread_id);
480
481 if (UseNUMA) {
482 int lgrp_id = os::numa_get_group_id();
483 if (lgrp_id != -1) {
484 thread->set_lgrp_id(lgrp_id);
485 }
486 }
487
488 // Initial thread state is INITIALIZED, not SUSPENDED
489 osthread->set_state(INITIALIZED);
490
491 return osthread;
492 }
493
494
495 bool os::create_attached_thread(JavaThread* thread) {
496 #ifdef ASSERT
497 thread->verify_not_published();
498 #endif
499 HANDLE thread_h;
500 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
501 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
502 fatal("DuplicateHandle failed\n");
503 }
504 OSThread* osthread = create_os_thread(thread, thread_h,
505 (int)current_thread_id());
506 if (osthread == NULL) {
507 return false;
508 }
509
510 // Initial thread state is RUNNABLE
511 osthread->set_state(RUNNABLE);
512
513 thread->set_osthread(osthread);
514 return true;
515 }
516
517 bool os::create_main_thread(JavaThread* thread) {
518 #ifdef ASSERT
519 thread->verify_not_published();
520 #endif
521 if (_starting_thread == NULL) {
522 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
523 if (_starting_thread == NULL) {
524 return false;
525 }
526 }
527
528 // The primordial thread is runnable from the start)
529 _starting_thread->set_state(RUNNABLE);
530
531 thread->set_osthread(_starting_thread);
532 return true;
533 }
534
535 // Allocate and initialize a new OSThread
536 bool os::create_thread(Thread* thread, ThreadType thr_type,
537 size_t stack_size) {
538 unsigned thread_id;
539
540 // Allocate the OSThread object
541 OSThread* osthread = new OSThread(NULL, NULL);
542 if (osthread == NULL) {
543 return false;
544 }
545
546 // Initialize support for Java interrupts
547 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
548 if (interrupt_event == NULL) {
549 delete osthread;
550 return NULL;
551 }
552 osthread->set_interrupt_event(interrupt_event);
553 osthread->set_interrupted(false);
554
555 thread->set_osthread(osthread);
556
557 if (stack_size == 0) {
558 switch (thr_type) {
559 case os::java_thread:
560 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
561 if (JavaThread::stack_size_at_create() > 0) {
562 stack_size = JavaThread::stack_size_at_create();
563 }
564 break;
565 case os::compiler_thread:
566 if (CompilerThreadStackSize > 0) {
567 stack_size = (size_t)(CompilerThreadStackSize * K);
568 break;
569 } // else fall through:
570 // use VMThreadStackSize if CompilerThreadStackSize is not defined
571 case os::vm_thread:
572 case os::pgc_thread:
573 case os::cgc_thread:
574 case os::watcher_thread:
575 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
576 break;
577 }
578 }
579
580 // Create the Win32 thread
581 //
582 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
583 // does not specify stack size. Instead, it specifies the size of
584 // initially committed space. The stack size is determined by
585 // PE header in the executable. If the committed "stack_size" is larger
586 // than default value in the PE header, the stack is rounded up to the
587 // nearest multiple of 1MB. For example if the launcher has default
588 // stack size of 320k, specifying any size less than 320k does not
589 // affect the actual stack size at all, it only affects the initial
590 // commitment. On the other hand, specifying 'stack_size' larger than
591 // default value may cause significant increase in memory usage, because
592 // not only the stack space will be rounded up to MB, but also the
593 // entire space is committed upfront.
594 //
595 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
596 // for CreateThread() that can treat 'stack_size' as stack size. However we
597 // are not supposed to call CreateThread() directly according to MSDN
598 // document because JVM uses C runtime library. The good news is that the
599 // flag appears to work with _beginthredex() as well.
600
601 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
602 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
603 #endif
604
605 HANDLE thread_handle =
606 (HANDLE)_beginthreadex(NULL,
607 (unsigned)stack_size,
608 (unsigned (__stdcall *)(void*)) java_start,
609 thread,
610 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
611 &thread_id);
612 if (thread_handle == NULL) {
613 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
614 // without the flag.
615 thread_handle =
616 (HANDLE)_beginthreadex(NULL,
617 (unsigned)stack_size,
618 (unsigned (__stdcall *)(void*)) java_start,
619 thread,
620 CREATE_SUSPENDED,
621 &thread_id);
622 }
623 if (thread_handle == NULL) {
624 // Need to clean up stuff we've allocated so far
625 CloseHandle(osthread->interrupt_event());
626 thread->set_osthread(NULL);
627 delete osthread;
628 return NULL;
629 }
630
631 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
632
633 // Store info on the Win32 thread into the OSThread
634 osthread->set_thread_handle(thread_handle);
635 osthread->set_thread_id(thread_id);
636
637 // Initial thread state is INITIALIZED, not SUSPENDED
638 osthread->set_state(INITIALIZED);
639
640 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
641 return true;
642 }
643
644
645 // Free Win32 resources related to the OSThread
646 void os::free_thread(OSThread* osthread) {
647 assert(osthread != NULL, "osthread not set");
648 CloseHandle(osthread->thread_handle());
649 CloseHandle(osthread->interrupt_event());
650 delete osthread;
651 }
652
653 static jlong first_filetime;
654 static jlong initial_performance_count;
655 static jlong performance_frequency;
656
657
658 jlong as_long(LARGE_INTEGER x) {
659 jlong result = 0; // initialization to avoid warning
660 set_high(&result, x.HighPart);
661 set_low(&result, x.LowPart);
662 return result;
663 }
664
665
666 jlong os::elapsed_counter() {
667 LARGE_INTEGER count;
668 if (win32::_has_performance_count) {
669 QueryPerformanceCounter(&count);
670 return as_long(count) - initial_performance_count;
671 } else {
672 FILETIME wt;
673 GetSystemTimeAsFileTime(&wt);
674 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
675 }
676 }
677
678
679 jlong os::elapsed_frequency() {
680 if (win32::_has_performance_count) {
681 return performance_frequency;
682 } else {
683 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
684 return 10000000;
685 }
686 }
687
688
689 julong os::available_memory() {
690 return win32::available_memory();
691 }
692
693 julong os::win32::available_memory() {
694 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
695 // value if total memory is larger than 4GB
696 MEMORYSTATUSEX ms;
697 ms.dwLength = sizeof(ms);
698 GlobalMemoryStatusEx(&ms);
699
700 return (julong)ms.ullAvailPhys;
701 }
702
703 julong os::physical_memory() {
704 return win32::physical_memory();
705 }
706
707 bool os::has_allocatable_memory_limit(julong* limit) {
708 MEMORYSTATUSEX ms;
709 ms.dwLength = sizeof(ms);
710 GlobalMemoryStatusEx(&ms);
711 #ifdef _LP64
712 *limit = (julong)ms.ullAvailVirtual;
713 return true;
714 #else
715 // Limit to 1400m because of the 2gb address space wall
716 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
717 return true;
718 #endif
719 }
720
721 // VC6 lacks DWORD_PTR
722 #if _MSC_VER < 1300
723 typedef UINT_PTR DWORD_PTR;
724 #endif
725
726 int os::active_processor_count() {
727 DWORD_PTR lpProcessAffinityMask = 0;
728 DWORD_PTR lpSystemAffinityMask = 0;
729 int proc_count = processor_count();
730 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
731 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
732 // Nof active processors is number of bits in process affinity mask
733 int bitcount = 0;
734 while (lpProcessAffinityMask != 0) {
735 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
736 bitcount++;
737 }
738 return bitcount;
739 } else {
740 return proc_count;
741 }
742 }
743
744 void os::set_native_thread_name(const char *name) {
745
746 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
747 //
748 // Note that unfortunately this only works if the process
749 // is already attached to a debugger; debugger must observe
750 // the exception below to show the correct name.
751
752 const DWORD MS_VC_EXCEPTION = 0x406D1388;
753 struct {
754 DWORD dwType; // must be 0x1000
755 LPCSTR szName; // pointer to name (in user addr space)
756 DWORD dwThreadID; // thread ID (-1=caller thread)
757 DWORD dwFlags; // reserved for future use, must be zero
758 } info;
759
760 info.dwType = 0x1000;
761 info.szName = name;
762 info.dwThreadID = -1;
763 info.dwFlags = 0;
764
765 __try {
766 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
767 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
768 }
769
770 bool os::distribute_processes(uint length, uint* distribution) {
771 // Not yet implemented.
772 return false;
773 }
774
775 bool os::bind_to_processor(uint processor_id) {
776 // Not yet implemented.
777 return false;
778 }
779
780 void os::win32::initialize_performance_counter() {
781 LARGE_INTEGER count;
782 if (QueryPerformanceFrequency(&count)) {
783 win32::_has_performance_count = 1;
784 performance_frequency = as_long(count);
785 QueryPerformanceCounter(&count);
786 initial_performance_count = as_long(count);
787 } else {
788 win32::_has_performance_count = 0;
789 FILETIME wt;
790 GetSystemTimeAsFileTime(&wt);
791 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
792 }
793 }
794
795
796 double os::elapsedTime() {
797 return (double) elapsed_counter() / (double) elapsed_frequency();
798 }
799
800
801 // Windows format:
802 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
803 // Java format:
804 // Java standards require the number of milliseconds since 1/1/1970
805
806 // Constant offset - calculated using offset()
807 static jlong _offset = 116444736000000000;
808 // Fake time counter for reproducible results when debugging
809 static jlong fake_time = 0;
810
811 #ifdef ASSERT
812 // Just to be safe, recalculate the offset in debug mode
813 static jlong _calculated_offset = 0;
814 static int _has_calculated_offset = 0;
815
816 jlong offset() {
817 if (_has_calculated_offset) return _calculated_offset;
818 SYSTEMTIME java_origin;
819 java_origin.wYear = 1970;
820 java_origin.wMonth = 1;
821 java_origin.wDayOfWeek = 0; // ignored
822 java_origin.wDay = 1;
823 java_origin.wHour = 0;
824 java_origin.wMinute = 0;
825 java_origin.wSecond = 0;
826 java_origin.wMilliseconds = 0;
827 FILETIME jot;
828 if (!SystemTimeToFileTime(&java_origin, &jot)) {
829 fatal("Error = %d\nWindows error", GetLastError());
830 }
831 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
832 _has_calculated_offset = 1;
833 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
834 return _calculated_offset;
835 }
836 #else
837 jlong offset() {
838 return _offset;
839 }
840 #endif
841
842 jlong windows_to_java_time(FILETIME wt) {
843 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
844 return (a - offset()) / 10000;
845 }
846
847 // Returns time ticks in (10th of micro seconds)
848 jlong windows_to_time_ticks(FILETIME wt) {
849 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
850 return (a - offset());
851 }
852
853 FILETIME java_to_windows_time(jlong l) {
854 jlong a = (l * 10000) + offset();
855 FILETIME result;
856 result.dwHighDateTime = high(a);
857 result.dwLowDateTime = low(a);
858 return result;
859 }
860
861 bool os::supports_vtime() { return true; }
862 bool os::enable_vtime() { return false; }
863 bool os::vtime_enabled() { return false; }
864
865 double os::elapsedVTime() {
866 FILETIME created;
867 FILETIME exited;
868 FILETIME kernel;
869 FILETIME user;
870 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
871 // the resolution of windows_to_java_time() should be sufficient (ms)
872 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
873 } else {
874 return elapsedTime();
875 }
876 }
877
878 jlong os::javaTimeMillis() {
879 if (UseFakeTimers) {
880 return fake_time++;
881 } else {
882 FILETIME wt;
883 GetSystemTimeAsFileTime(&wt);
884 return windows_to_java_time(wt);
885 }
886 }
887
888 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
889 FILETIME wt;
890 GetSystemTimeAsFileTime(&wt);
891 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
892 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
893 seconds = secs;
894 nanos = jlong(ticks - (secs*10000000)) * 100;
895 }
896
897 jlong os::javaTimeNanos() {
898 if (!win32::_has_performance_count) {
899 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
900 } else {
901 LARGE_INTEGER current_count;
902 QueryPerformanceCounter(¤t_count);
903 double current = as_long(current_count);
904 double freq = performance_frequency;
905 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
906 return time;
907 }
908 }
909
910 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
911 if (!win32::_has_performance_count) {
912 // javaTimeMillis() doesn't have much percision,
913 // but it is not going to wrap -- so all 64 bits
914 info_ptr->max_value = ALL_64_BITS;
915
916 // this is a wall clock timer, so may skip
917 info_ptr->may_skip_backward = true;
918 info_ptr->may_skip_forward = true;
919 } else {
920 jlong freq = performance_frequency;
921 if (freq < NANOSECS_PER_SEC) {
922 // the performance counter is 64 bits and we will
923 // be multiplying it -- so no wrap in 64 bits
924 info_ptr->max_value = ALL_64_BITS;
925 } else if (freq > NANOSECS_PER_SEC) {
926 // use the max value the counter can reach to
927 // determine the max value which could be returned
928 julong max_counter = (julong)ALL_64_BITS;
929 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
930 } else {
931 // the performance counter is 64 bits and we will
932 // be using it directly -- so no wrap in 64 bits
933 info_ptr->max_value = ALL_64_BITS;
934 }
935
936 // using a counter, so no skipping
937 info_ptr->may_skip_backward = false;
938 info_ptr->may_skip_forward = false;
939 }
940 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
941 }
942
943 char* os::local_time_string(char *buf, size_t buflen) {
944 SYSTEMTIME st;
945 GetLocalTime(&st);
946 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
947 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
948 return buf;
949 }
950
951 bool os::getTimesSecs(double* process_real_time,
952 double* process_user_time,
953 double* process_system_time) {
954 HANDLE h_process = GetCurrentProcess();
955 FILETIME create_time, exit_time, kernel_time, user_time;
956 BOOL result = GetProcessTimes(h_process,
957 &create_time,
958 &exit_time,
959 &kernel_time,
960 &user_time);
961 if (result != 0) {
962 FILETIME wt;
963 GetSystemTimeAsFileTime(&wt);
964 jlong rtc_millis = windows_to_java_time(wt);
965 jlong user_millis = windows_to_java_time(user_time);
966 jlong system_millis = windows_to_java_time(kernel_time);
967 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
968 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
969 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
970 return true;
971 } else {
972 return false;
973 }
974 }
975
976 void os::shutdown() {
977 // allow PerfMemory to attempt cleanup of any persistent resources
978 perfMemory_exit();
979
980 // flush buffered output, finish log files
981 ostream_abort();
982
983 // Check for abort hook
984 abort_hook_t abort_hook = Arguments::abort_hook();
985 if (abort_hook != NULL) {
986 abort_hook();
987 }
988 }
989
990
991 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
992 PMINIDUMP_EXCEPTION_INFORMATION,
993 PMINIDUMP_USER_STREAM_INFORMATION,
994 PMINIDUMP_CALLBACK_INFORMATION);
995
996 static HANDLE dumpFile = NULL;
997
998 // Check if dump file can be created.
999 void os::check_dump_limit(char* buffer, size_t buffsz) {
1000 bool status = true;
1001 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1002 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1003 status = false;
1004 }
1005
1006 #ifndef ASSERT
1007 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1008 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1009 status = false;
1010 }
1011 #endif
1012
1013 if (status) {
1014 const char* cwd = get_current_directory(NULL, 0);
1015 int pid = current_process_id();
1016 if (cwd != NULL) {
1017 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1018 } else {
1019 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1020 }
1021
1022 if (dumpFile == NULL &&
1023 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1024 == INVALID_HANDLE_VALUE) {
1025 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1026 status = false;
1027 }
1028 }
1029 VMError::record_coredump_status(buffer, status);
1030 }
1031
1032 void os::abort(bool dump_core, void* siginfo, void* context) {
1033 HINSTANCE dbghelp;
1034 EXCEPTION_POINTERS ep;
1035 MINIDUMP_EXCEPTION_INFORMATION mei;
1036 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1037
1038 HANDLE hProcess = GetCurrentProcess();
1039 DWORD processId = GetCurrentProcessId();
1040 MINIDUMP_TYPE dumpType;
1041
1042 shutdown();
1043 if (!dump_core || dumpFile == NULL) {
1044 if (dumpFile != NULL) {
1045 CloseHandle(dumpFile);
1046 }
1047 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1048 }
1049
1050 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1051
1052 if (dbghelp == NULL) {
1053 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1054 CloseHandle(dumpFile);
1055 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1056 }
1057
1058 _MiniDumpWriteDump =
1059 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1060 PMINIDUMP_EXCEPTION_INFORMATION,
1061 PMINIDUMP_USER_STREAM_INFORMATION,
1062 PMINIDUMP_CALLBACK_INFORMATION),
1063 GetProcAddress(dbghelp,
1064 "MiniDumpWriteDump"));
1065
1066 if (_MiniDumpWriteDump == NULL) {
1067 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1068 CloseHandle(dumpFile);
1069 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1070 }
1071
1072 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1073
1074 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1075 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1076 #if API_VERSION_NUMBER >= 11
1077 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1078 MiniDumpWithUnloadedModules);
1079 #endif
1080
1081 if (siginfo != NULL && context != NULL) {
1082 ep.ContextRecord = (PCONTEXT) context;
1083 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1084
1085 mei.ThreadId = GetCurrentThreadId();
1086 mei.ExceptionPointers = &ep;
1087 pmei = &mei;
1088 } else {
1089 pmei = NULL;
1090 }
1091
1092 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1093 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1094 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1095 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1096 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1097 }
1098 CloseHandle(dumpFile);
1099 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1100 }
1101
1102 // Die immediately, no exit hook, no abort hook, no cleanup.
1103 void os::die() {
1104 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1105 }
1106
1107 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1108 // * dirent_md.c 1.15 00/02/02
1109 //
1110 // The declarations for DIR and struct dirent are in jvm_win32.h.
1111
1112 // Caller must have already run dirname through JVM_NativePath, which removes
1113 // duplicate slashes and converts all instances of '/' into '\\'.
1114
1115 DIR * os::opendir(const char *dirname) {
1116 assert(dirname != NULL, "just checking"); // hotspot change
1117 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1118 DWORD fattr; // hotspot change
1119 char alt_dirname[4] = { 0, 0, 0, 0 };
1120
1121 if (dirp == 0) {
1122 errno = ENOMEM;
1123 return 0;
1124 }
1125
1126 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1127 // as a directory in FindFirstFile(). We detect this case here and
1128 // prepend the current drive name.
1129 //
1130 if (dirname[1] == '\0' && dirname[0] == '\\') {
1131 alt_dirname[0] = _getdrive() + 'A' - 1;
1132 alt_dirname[1] = ':';
1133 alt_dirname[2] = '\\';
1134 alt_dirname[3] = '\0';
1135 dirname = alt_dirname;
1136 }
1137
1138 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1139 if (dirp->path == 0) {
1140 free(dirp);
1141 errno = ENOMEM;
1142 return 0;
1143 }
1144 strcpy(dirp->path, dirname);
1145
1146 fattr = GetFileAttributes(dirp->path);
1147 if (fattr == 0xffffffff) {
1148 free(dirp->path);
1149 free(dirp);
1150 errno = ENOENT;
1151 return 0;
1152 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1153 free(dirp->path);
1154 free(dirp);
1155 errno = ENOTDIR;
1156 return 0;
1157 }
1158
1159 // Append "*.*", or possibly "\\*.*", to path
1160 if (dirp->path[1] == ':' &&
1161 (dirp->path[2] == '\0' ||
1162 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1163 // No '\\' needed for cases like "Z:" or "Z:\"
1164 strcat(dirp->path, "*.*");
1165 } else {
1166 strcat(dirp->path, "\\*.*");
1167 }
1168
1169 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1170 if (dirp->handle == INVALID_HANDLE_VALUE) {
1171 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1172 free(dirp->path);
1173 free(dirp);
1174 errno = EACCES;
1175 return 0;
1176 }
1177 }
1178 return dirp;
1179 }
1180
1181 // parameter dbuf unused on Windows
1182 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return 0;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return 0;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 static bool file_exists(const char* filename) {
1229 if (filename == NULL || strlen(filename) == 0) {
1230 return false;
1231 }
1232 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1233 }
1234
1235 bool os::dll_build_name(char *buffer, size_t buflen,
1236 const char* pname, const char* fname) {
1237 bool retval = false;
1238 const size_t pnamelen = pname ? strlen(pname) : 0;
1239 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1240
1241 // Return error on buffer overflow.
1242 if (pnamelen + strlen(fname) + 10 > buflen) {
1243 return retval;
1244 }
1245
1246 if (pnamelen == 0) {
1247 jio_snprintf(buffer, buflen, "%s.dll", fname);
1248 retval = true;
1249 } else if (c == ':' || c == '\\') {
1250 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1251 retval = true;
1252 } else if (strchr(pname, *os::path_separator()) != NULL) {
1253 int n;
1254 char** pelements = split_path(pname, &n);
1255 if (pelements == NULL) {
1256 return false;
1257 }
1258 for (int i = 0; i < n; i++) {
1259 char* path = pelements[i];
1260 // Really shouldn't be NULL, but check can't hurt
1261 size_t plen = (path == NULL) ? 0 : strlen(path);
1262 if (plen == 0) {
1263 continue; // skip the empty path values
1264 }
1265 const char lastchar = path[plen - 1];
1266 if (lastchar == ':' || lastchar == '\\') {
1267 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1268 } else {
1269 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1270 }
1271 if (file_exists(buffer)) {
1272 retval = true;
1273 break;
1274 }
1275 }
1276 // release the storage
1277 for (int i = 0; i < n; i++) {
1278 if (pelements[i] != NULL) {
1279 FREE_C_HEAP_ARRAY(char, pelements[i]);
1280 }
1281 }
1282 if (pelements != NULL) {
1283 FREE_C_HEAP_ARRAY(char*, pelements);
1284 }
1285 } else {
1286 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1287 retval = true;
1288 }
1289 return retval;
1290 }
1291
1292 // Needs to be in os specific directory because windows requires another
1293 // header file <direct.h>
1294 const char* os::get_current_directory(char *buf, size_t buflen) {
1295 int n = static_cast<int>(buflen);
1296 if (buflen > INT_MAX) n = INT_MAX;
1297 return _getcwd(buf, n);
1298 }
1299
1300 //-----------------------------------------------------------
1301 // Helper functions for fatal error handler
1302 #ifdef _WIN64
1303 // Helper routine which returns true if address in
1304 // within the NTDLL address space.
1305 //
1306 static bool _addr_in_ntdll(address addr) {
1307 HMODULE hmod;
1308 MODULEINFO minfo;
1309
1310 hmod = GetModuleHandle("NTDLL.DLL");
1311 if (hmod == NULL) return false;
1312 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1313 &minfo, sizeof(MODULEINFO))) {
1314 return false;
1315 }
1316
1317 if ((addr >= minfo.lpBaseOfDll) &&
1318 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1319 return true;
1320 } else {
1321 return false;
1322 }
1323 }
1324 #endif
1325
1326 struct _modinfo {
1327 address addr;
1328 char* full_path; // point to a char buffer
1329 int buflen; // size of the buffer
1330 address base_addr;
1331 };
1332
1333 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1334 address top_address, void * param) {
1335 struct _modinfo *pmod = (struct _modinfo *)param;
1336 if (!pmod) return -1;
1337
1338 if (base_addr <= pmod->addr &&
1339 top_address > pmod->addr) {
1340 // if a buffer is provided, copy path name to the buffer
1341 if (pmod->full_path) {
1342 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1343 }
1344 pmod->base_addr = base_addr;
1345 return 1;
1346 }
1347 return 0;
1348 }
1349
1350 bool os::dll_address_to_library_name(address addr, char* buf,
1351 int buflen, int* offset) {
1352 // buf is not optional, but offset is optional
1353 assert(buf != NULL, "sanity check");
1354
1355 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1356 // return the full path to the DLL file, sometimes it returns path
1357 // to the corresponding PDB file (debug info); sometimes it only
1358 // returns partial path, which makes life painful.
1359
1360 struct _modinfo mi;
1361 mi.addr = addr;
1362 mi.full_path = buf;
1363 mi.buflen = buflen;
1364 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1365 // buf already contains path name
1366 if (offset) *offset = addr - mi.base_addr;
1367 return true;
1368 }
1369
1370 buf[0] = '\0';
1371 if (offset) *offset = -1;
1372 return false;
1373 }
1374
1375 bool os::dll_address_to_function_name(address addr, char *buf,
1376 int buflen, int *offset,
1377 bool demangle) {
1378 // buf is not optional, but offset is optional
1379 assert(buf != NULL, "sanity check");
1380
1381 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1382 return true;
1383 }
1384 if (offset != NULL) *offset = -1;
1385 buf[0] = '\0';
1386 return false;
1387 }
1388
1389 // save the start and end address of jvm.dll into param[0] and param[1]
1390 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1391 address top_address, void * param) {
1392 if (!param) return -1;
1393
1394 if (base_addr <= (address)_locate_jvm_dll &&
1395 top_address > (address)_locate_jvm_dll) {
1396 ((address*)param)[0] = base_addr;
1397 ((address*)param)[1] = top_address;
1398 return 1;
1399 }
1400 return 0;
1401 }
1402
1403 address vm_lib_location[2]; // start and end address of jvm.dll
1404
1405 // check if addr is inside jvm.dll
1406 bool os::address_is_in_vm(address addr) {
1407 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1408 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1409 assert(false, "Can't find jvm module.");
1410 return false;
1411 }
1412 }
1413
1414 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1415 }
1416
1417 // print module info; param is outputStream*
1418 static int _print_module(const char* fname, address base_address,
1419 address top_address, void* param) {
1420 if (!param) return -1;
1421
1422 outputStream* st = (outputStream*)param;
1423
1424 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1425 return 0;
1426 }
1427
1428 // Loads .dll/.so and
1429 // in case of error it checks if .dll/.so was built for the
1430 // same architecture as Hotspot is running on
1431 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1432 void * result = LoadLibrary(name);
1433 if (result != NULL) {
1434 return result;
1435 }
1436
1437 DWORD errcode = GetLastError();
1438 if (errcode == ERROR_MOD_NOT_FOUND) {
1439 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1440 ebuf[ebuflen - 1] = '\0';
1441 return NULL;
1442 }
1443
1444 // Parsing dll below
1445 // If we can read dll-info and find that dll was built
1446 // for an architecture other than Hotspot is running in
1447 // - then print to buffer "DLL was built for a different architecture"
1448 // else call os::lasterror to obtain system error message
1449
1450 // Read system error message into ebuf
1451 // It may or may not be overwritten below (in the for loop and just above)
1452 lasterror(ebuf, (size_t) ebuflen);
1453 ebuf[ebuflen - 1] = '\0';
1454 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1455 if (fd < 0) {
1456 return NULL;
1457 }
1458
1459 uint32_t signature_offset;
1460 uint16_t lib_arch = 0;
1461 bool failed_to_get_lib_arch =
1462 ( // Go to position 3c in the dll
1463 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1464 ||
1465 // Read location of signature
1466 (sizeof(signature_offset) !=
1467 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1468 ||
1469 // Go to COFF File Header in dll
1470 // that is located after "signature" (4 bytes long)
1471 (os::seek_to_file_offset(fd,
1472 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1473 ||
1474 // Read field that contains code of architecture
1475 // that dll was built for
1476 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1477 );
1478
1479 ::close(fd);
1480 if (failed_to_get_lib_arch) {
1481 // file i/o error - report os::lasterror(...) msg
1482 return NULL;
1483 }
1484
1485 typedef struct {
1486 uint16_t arch_code;
1487 char* arch_name;
1488 } arch_t;
1489
1490 static const arch_t arch_array[] = {
1491 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1492 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1493 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1494 };
1495 #if (defined _M_IA64)
1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1497 #elif (defined _M_AMD64)
1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1499 #elif (defined _M_IX86)
1500 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1501 #else
1502 #error Method os::dll_load requires that one of following \
1503 is defined :_M_IA64,_M_AMD64 or _M_IX86
1504 #endif
1505
1506
1507 // Obtain a string for printf operation
1508 // lib_arch_str shall contain string what platform this .dll was built for
1509 // running_arch_str shall string contain what platform Hotspot was built for
1510 char *running_arch_str = NULL, *lib_arch_str = NULL;
1511 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1512 if (lib_arch == arch_array[i].arch_code) {
1513 lib_arch_str = arch_array[i].arch_name;
1514 }
1515 if (running_arch == arch_array[i].arch_code) {
1516 running_arch_str = arch_array[i].arch_name;
1517 }
1518 }
1519
1520 assert(running_arch_str,
1521 "Didn't find running architecture code in arch_array");
1522
1523 // If the architecture is right
1524 // but some other error took place - report os::lasterror(...) msg
1525 if (lib_arch == running_arch) {
1526 return NULL;
1527 }
1528
1529 if (lib_arch_str != NULL) {
1530 ::_snprintf(ebuf, ebuflen - 1,
1531 "Can't load %s-bit .dll on a %s-bit platform",
1532 lib_arch_str, running_arch_str);
1533 } else {
1534 // don't know what architecture this dll was build for
1535 ::_snprintf(ebuf, ebuflen - 1,
1536 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1537 lib_arch, running_arch_str);
1538 }
1539
1540 return NULL;
1541 }
1542
1543 void os::print_dll_info(outputStream *st) {
1544 st->print_cr("Dynamic libraries:");
1545 get_loaded_modules_info(_print_module, (void *)st);
1546 }
1547
1548 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1549 HANDLE hProcess;
1550
1551 # define MAX_NUM_MODULES 128
1552 HMODULE modules[MAX_NUM_MODULES];
1553 static char filename[MAX_PATH];
1554 int result = 0;
1555
1556 if (!os::PSApiDll::PSApiAvailable()) {
1557 return 0;
1558 }
1559
1560 int pid = os::current_process_id();
1561 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1562 FALSE, pid);
1563 if (hProcess == NULL) return 0;
1564
1565 DWORD size_needed;
1566 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1567 sizeof(modules), &size_needed)) {
1568 CloseHandle(hProcess);
1569 return 0;
1570 }
1571
1572 // number of modules that are currently loaded
1573 int num_modules = size_needed / sizeof(HMODULE);
1574
1575 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1576 // Get Full pathname:
1577 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1578 filename, sizeof(filename))) {
1579 filename[0] = '\0';
1580 }
1581
1582 MODULEINFO modinfo;
1583 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1584 &modinfo, sizeof(modinfo))) {
1585 modinfo.lpBaseOfDll = NULL;
1586 modinfo.SizeOfImage = 0;
1587 }
1588
1589 // Invoke callback function
1590 result = callback(filename, (address)modinfo.lpBaseOfDll,
1591 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1592 if (result) break;
1593 }
1594
1595 CloseHandle(hProcess);
1596 return result;
1597 }
1598
1599 #ifndef PRODUCT
1600 bool os::get_host_name(char* buf, size_t buflen) {
1601 DWORD size = (DWORD)buflen;
1602 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1603 }
1604 #endif // PRODUCT
1605
1606 void os::get_summary_os_info(char* buf, size_t buflen) {
1607 stringStream sst(buf, buflen);
1608 os::win32::print_windows_version(&sst);
1609 // chop off newline character
1610 char* nl = strchr(buf, '\n');
1611 if (nl != NULL) *nl = '\0';
1612 }
1613
1614 int os::log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1615 int ret = vsnprintf(buf, len, fmt, args);
1616 // Get the correct buffer size if buf is too small
1617 if (ret < 0) {
1618 return _vscprintf(fmt, args);
1619 }
1620 return ret;
1621 }
1622
1623 void os::print_os_info_brief(outputStream* st) {
1624 os::print_os_info(st);
1625 }
1626
1627 void os::print_os_info(outputStream* st) {
1628 #ifdef ASSERT
1629 char buffer[1024];
1630 st->print("HostName: ");
1631 if (get_host_name(buffer, sizeof(buffer))) {
1632 st->print("%s ", buffer);
1633 } else {
1634 st->print("N/A ");
1635 }
1636 #endif
1637 st->print("OS:");
1638 os::win32::print_windows_version(st);
1639 }
1640
1641 void os::win32::print_windows_version(outputStream* st) {
1642 OSVERSIONINFOEX osvi;
1643 VS_FIXEDFILEINFO *file_info;
1644 TCHAR kernel32_path[MAX_PATH];
1645 UINT len, ret;
1646
1647 // Use the GetVersionEx information to see if we're on a server or
1648 // workstation edition of Windows. Starting with Windows 8.1 we can't
1649 // trust the OS version information returned by this API.
1650 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1651 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1652 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1653 st->print_cr("Call to GetVersionEx failed");
1654 return;
1655 }
1656 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1657
1658 // Get the full path to \Windows\System32\kernel32.dll and use that for
1659 // determining what version of Windows we're running on.
1660 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1661 ret = GetSystemDirectory(kernel32_path, len);
1662 if (ret == 0 || ret > len) {
1663 st->print_cr("Call to GetSystemDirectory failed");
1664 return;
1665 }
1666 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1667
1668 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1669 if (version_size == 0) {
1670 st->print_cr("Call to GetFileVersionInfoSize failed");
1671 return;
1672 }
1673
1674 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1675 if (version_info == NULL) {
1676 st->print_cr("Failed to allocate version_info");
1677 return;
1678 }
1679
1680 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1681 os::free(version_info);
1682 st->print_cr("Call to GetFileVersionInfo failed");
1683 return;
1684 }
1685
1686 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1687 os::free(version_info);
1688 st->print_cr("Call to VerQueryValue failed");
1689 return;
1690 }
1691
1692 int major_version = HIWORD(file_info->dwProductVersionMS);
1693 int minor_version = LOWORD(file_info->dwProductVersionMS);
1694 int build_number = HIWORD(file_info->dwProductVersionLS);
1695 int build_minor = LOWORD(file_info->dwProductVersionLS);
1696 int os_vers = major_version * 1000 + minor_version;
1697 os::free(version_info);
1698
1699 st->print(" Windows ");
1700 switch (os_vers) {
1701
1702 case 6000:
1703 if (is_workstation) {
1704 st->print("Vista");
1705 } else {
1706 st->print("Server 2008");
1707 }
1708 break;
1709
1710 case 6001:
1711 if (is_workstation) {
1712 st->print("7");
1713 } else {
1714 st->print("Server 2008 R2");
1715 }
1716 break;
1717
1718 case 6002:
1719 if (is_workstation) {
1720 st->print("8");
1721 } else {
1722 st->print("Server 2012");
1723 }
1724 break;
1725
1726 case 6003:
1727 if (is_workstation) {
1728 st->print("8.1");
1729 } else {
1730 st->print("Server 2012 R2");
1731 }
1732 break;
1733
1734 case 10000:
1735 if (is_workstation) {
1736 st->print("10");
1737 } else {
1738 // The server version name of Windows 10 is not known at this time
1739 st->print("%d.%d", major_version, minor_version);
1740 }
1741 break;
1742
1743 default:
1744 // Unrecognized windows, print out its major and minor versions
1745 st->print("%d.%d", major_version, minor_version);
1746 break;
1747 }
1748
1749 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1750 // find out whether we are running on 64 bit processor or not
1751 SYSTEM_INFO si;
1752 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1753 os::Kernel32Dll::GetNativeSystemInfo(&si);
1754 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1755 st->print(" , 64 bit");
1756 }
1757
1758 st->print(" Build %d", build_number);
1759 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1760 st->cr();
1761 }
1762
1763 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1764 // Nothing to do for now.
1765 }
1766
1767 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1768 HKEY key;
1769 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1770 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1771 if (status == ERROR_SUCCESS) {
1772 DWORD size = (DWORD)buflen;
1773 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1774 if (status != ERROR_SUCCESS) {
1775 strncpy(buf, "## __CPU__", buflen);
1776 }
1777 RegCloseKey(key);
1778 } else {
1779 // Put generic cpu info to return
1780 strncpy(buf, "## __CPU__", buflen);
1781 }
1782 }
1783
1784 void os::print_memory_info(outputStream* st) {
1785 st->print("Memory:");
1786 st->print(" %dk page", os::vm_page_size()>>10);
1787
1788 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1789 // value if total memory is larger than 4GB
1790 MEMORYSTATUSEX ms;
1791 ms.dwLength = sizeof(ms);
1792 GlobalMemoryStatusEx(&ms);
1793
1794 st->print(", physical %uk", os::physical_memory() >> 10);
1795 st->print("(%uk free)", os::available_memory() >> 10);
1796
1797 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1798 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1799 st->cr();
1800 }
1801
1802 void os::print_siginfo(outputStream *st, void *siginfo) {
1803 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1804 st->print("siginfo:");
1805 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1806
1807 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1808 er->NumberParameters >= 2) {
1809 switch (er->ExceptionInformation[0]) {
1810 case 0: st->print(", reading address"); break;
1811 case 1: st->print(", writing address"); break;
1812 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1813 er->ExceptionInformation[0]);
1814 }
1815 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1816 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1817 er->NumberParameters >= 2 && UseSharedSpaces) {
1818 FileMapInfo* mapinfo = FileMapInfo::current_info();
1819 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1820 st->print("\n\nError accessing class data sharing archive." \
1821 " Mapped file inaccessible during execution, " \
1822 " possible disk/network problem.");
1823 }
1824 } else {
1825 int num = er->NumberParameters;
1826 if (num > 0) {
1827 st->print(", ExceptionInformation=");
1828 for (int i = 0; i < num; i++) {
1829 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1830 }
1831 }
1832 }
1833 st->cr();
1834 }
1835
1836 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1837 // do nothing
1838 }
1839
1840 static char saved_jvm_path[MAX_PATH] = {0};
1841
1842 // Find the full path to the current module, jvm.dll
1843 void os::jvm_path(char *buf, jint buflen) {
1844 // Error checking.
1845 if (buflen < MAX_PATH) {
1846 assert(false, "must use a large-enough buffer");
1847 buf[0] = '\0';
1848 return;
1849 }
1850 // Lazy resolve the path to current module.
1851 if (saved_jvm_path[0] != 0) {
1852 strcpy(buf, saved_jvm_path);
1853 return;
1854 }
1855
1856 buf[0] = '\0';
1857 if (Arguments::sun_java_launcher_is_altjvm()) {
1858 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1859 // for a JAVA_HOME environment variable and fix up the path so it
1860 // looks like jvm.dll is installed there (append a fake suffix
1861 // hotspot/jvm.dll).
1862 char* java_home_var = ::getenv("JAVA_HOME");
1863 if (java_home_var != NULL && java_home_var[0] != 0 &&
1864 strlen(java_home_var) < (size_t)buflen) {
1865 strncpy(buf, java_home_var, buflen);
1866
1867 // determine if this is a legacy image or modules image
1868 // modules image doesn't have "jre" subdirectory
1869 size_t len = strlen(buf);
1870 char* jrebin_p = buf + len;
1871 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1872 if (0 != _access(buf, 0)) {
1873 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1874 }
1875 len = strlen(buf);
1876 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1877 }
1878 }
1879
1880 if (buf[0] == '\0') {
1881 GetModuleFileName(vm_lib_handle, buf, buflen);
1882 }
1883 strncpy(saved_jvm_path, buf, MAX_PATH);
1884 saved_jvm_path[MAX_PATH - 1] = '\0';
1885 }
1886
1887
1888 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1889 #ifndef _WIN64
1890 st->print("_");
1891 #endif
1892 }
1893
1894
1895 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1896 #ifndef _WIN64
1897 st->print("@%d", args_size * sizeof(int));
1898 #endif
1899 }
1900
1901 // This method is a copy of JDK's sysGetLastErrorString
1902 // from src/windows/hpi/src/system_md.c
1903
1904 size_t os::lasterror(char* buf, size_t len) {
1905 DWORD errval;
1906
1907 if ((errval = GetLastError()) != 0) {
1908 // DOS error
1909 size_t n = (size_t)FormatMessage(
1910 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1911 NULL,
1912 errval,
1913 0,
1914 buf,
1915 (DWORD)len,
1916 NULL);
1917 if (n > 3) {
1918 // Drop final '.', CR, LF
1919 if (buf[n - 1] == '\n') n--;
1920 if (buf[n - 1] == '\r') n--;
1921 if (buf[n - 1] == '.') n--;
1922 buf[n] = '\0';
1923 }
1924 return n;
1925 }
1926
1927 if (errno != 0) {
1928 // C runtime error that has no corresponding DOS error code
1929 const char* s = strerror(errno);
1930 size_t n = strlen(s);
1931 if (n >= len) n = len - 1;
1932 strncpy(buf, s, n);
1933 buf[n] = '\0';
1934 return n;
1935 }
1936
1937 return 0;
1938 }
1939
1940 int os::get_last_error() {
1941 DWORD error = GetLastError();
1942 if (error == 0) {
1943 error = errno;
1944 }
1945 return (int)error;
1946 }
1947
1948 WindowsSemaphore::WindowsSemaphore(uint value) {
1949 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1950
1951 guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());
1952 }
1953
1954 WindowsSemaphore::~WindowsSemaphore() {
1955 ::CloseHandle(_semaphore);
1956 }
1957
1958 void WindowsSemaphore::signal(uint count) {
1959 if (count > 0) {
1960 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1961
1962 assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());
1963 }
1964 }
1965
1966 void WindowsSemaphore::wait() {
1967 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1968 assert(ret != WAIT_FAILED, "WaitForSingleObject failed with error code: %lu", GetLastError());
1969 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);
1970 }
1971
1972 // sun.misc.Signal
1973 // NOTE that this is a workaround for an apparent kernel bug where if
1974 // a signal handler for SIGBREAK is installed then that signal handler
1975 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1976 // See bug 4416763.
1977 static void (*sigbreakHandler)(int) = NULL;
1978
1979 static void UserHandler(int sig, void *siginfo, void *context) {
1980 os::signal_notify(sig);
1981 // We need to reinstate the signal handler each time...
1982 os::signal(sig, (void*)UserHandler);
1983 }
1984
1985 void* os::user_handler() {
1986 return (void*) UserHandler;
1987 }
1988
1989 void* os::signal(int signal_number, void* handler) {
1990 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1991 void (*oldHandler)(int) = sigbreakHandler;
1992 sigbreakHandler = (void (*)(int)) handler;
1993 return (void*) oldHandler;
1994 } else {
1995 return (void*)::signal(signal_number, (void (*)(int))handler);
1996 }
1997 }
1998
1999 void os::signal_raise(int signal_number) {
2000 raise(signal_number);
2001 }
2002
2003 // The Win32 C runtime library maps all console control events other than ^C
2004 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2005 // logoff, and shutdown events. We therefore install our own console handler
2006 // that raises SIGTERM for the latter cases.
2007 //
2008 static BOOL WINAPI consoleHandler(DWORD event) {
2009 switch (event) {
2010 case CTRL_C_EVENT:
2011 if (is_error_reported()) {
2012 // Ctrl-C is pressed during error reporting, likely because the error
2013 // handler fails to abort. Let VM die immediately.
2014 os::die();
2015 }
2016
2017 os::signal_raise(SIGINT);
2018 return TRUE;
2019 break;
2020 case CTRL_BREAK_EVENT:
2021 if (sigbreakHandler != NULL) {
2022 (*sigbreakHandler)(SIGBREAK);
2023 }
2024 return TRUE;
2025 break;
2026 case CTRL_LOGOFF_EVENT: {
2027 // Don't terminate JVM if it is running in a non-interactive session,
2028 // such as a service process.
2029 USEROBJECTFLAGS flags;
2030 HANDLE handle = GetProcessWindowStation();
2031 if (handle != NULL &&
2032 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2033 sizeof(USEROBJECTFLAGS), NULL)) {
2034 // If it is a non-interactive session, let next handler to deal
2035 // with it.
2036 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2037 return FALSE;
2038 }
2039 }
2040 }
2041 case CTRL_CLOSE_EVENT:
2042 case CTRL_SHUTDOWN_EVENT:
2043 os::signal_raise(SIGTERM);
2044 return TRUE;
2045 break;
2046 default:
2047 break;
2048 }
2049 return FALSE;
2050 }
2051
2052 // The following code is moved from os.cpp for making this
2053 // code platform specific, which it is by its very nature.
2054
2055 // Return maximum OS signal used + 1 for internal use only
2056 // Used as exit signal for signal_thread
2057 int os::sigexitnum_pd() {
2058 return NSIG;
2059 }
2060
2061 // a counter for each possible signal value, including signal_thread exit signal
2062 static volatile jint pending_signals[NSIG+1] = { 0 };
2063 static HANDLE sig_sem = NULL;
2064
2065 void os::signal_init_pd() {
2066 // Initialize signal structures
2067 memset((void*)pending_signals, 0, sizeof(pending_signals));
2068
2069 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2070
2071 // Programs embedding the VM do not want it to attempt to receive
2072 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2073 // shutdown hooks mechanism introduced in 1.3. For example, when
2074 // the VM is run as part of a Windows NT service (i.e., a servlet
2075 // engine in a web server), the correct behavior is for any console
2076 // control handler to return FALSE, not TRUE, because the OS's
2077 // "final" handler for such events allows the process to continue if
2078 // it is a service (while terminating it if it is not a service).
2079 // To make this behavior uniform and the mechanism simpler, we
2080 // completely disable the VM's usage of these console events if -Xrs
2081 // (=ReduceSignalUsage) is specified. This means, for example, that
2082 // the CTRL-BREAK thread dump mechanism is also disabled in this
2083 // case. See bugs 4323062, 4345157, and related bugs.
2084
2085 if (!ReduceSignalUsage) {
2086 // Add a CTRL-C handler
2087 SetConsoleCtrlHandler(consoleHandler, TRUE);
2088 }
2089 }
2090
2091 void os::signal_notify(int signal_number) {
2092 BOOL ret;
2093 if (sig_sem != NULL) {
2094 Atomic::inc(&pending_signals[signal_number]);
2095 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2096 assert(ret != 0, "ReleaseSemaphore() failed");
2097 }
2098 }
2099
2100 static int check_pending_signals(bool wait_for_signal) {
2101 DWORD ret;
2102 while (true) {
2103 for (int i = 0; i < NSIG + 1; i++) {
2104 jint n = pending_signals[i];
2105 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2106 return i;
2107 }
2108 }
2109 if (!wait_for_signal) {
2110 return -1;
2111 }
2112
2113 JavaThread *thread = JavaThread::current();
2114
2115 ThreadBlockInVM tbivm(thread);
2116
2117 bool threadIsSuspended;
2118 do {
2119 thread->set_suspend_equivalent();
2120 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2121 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2122 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2123
2124 // were we externally suspended while we were waiting?
2125 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2126 if (threadIsSuspended) {
2127 // The semaphore has been incremented, but while we were waiting
2128 // another thread suspended us. We don't want to continue running
2129 // while suspended because that would surprise the thread that
2130 // suspended us.
2131 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2132 assert(ret != 0, "ReleaseSemaphore() failed");
2133
2134 thread->java_suspend_self();
2135 }
2136 } while (threadIsSuspended);
2137 }
2138 }
2139
2140 int os::signal_lookup() {
2141 return check_pending_signals(false);
2142 }
2143
2144 int os::signal_wait() {
2145 return check_pending_signals(true);
2146 }
2147
2148 // Implicit OS exception handling
2149
2150 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2151 address handler) {
2152 JavaThread* thread = JavaThread::current();
2153 // Save pc in thread
2154 #ifdef _M_IA64
2155 // Do not blow up if no thread info available.
2156 if (thread) {
2157 // Saving PRECISE pc (with slot information) in thread.
2158 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2159 // Convert precise PC into "Unix" format
2160 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2161 thread->set_saved_exception_pc((address)precise_pc);
2162 }
2163 // Set pc to handler
2164 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2165 // Clear out psr.ri (= Restart Instruction) in order to continue
2166 // at the beginning of the target bundle.
2167 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2168 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2169 #else
2170 #ifdef _M_AMD64
2171 // Do not blow up if no thread info available.
2172 if (thread) {
2173 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2174 }
2175 // Set pc to handler
2176 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2177 #else
2178 // Do not blow up if no thread info available.
2179 if (thread) {
2180 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2181 }
2182 // Set pc to handler
2183 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2184 #endif
2185 #endif
2186
2187 // Continue the execution
2188 return EXCEPTION_CONTINUE_EXECUTION;
2189 }
2190
2191
2192 // Used for PostMortemDump
2193 extern "C" void safepoints();
2194 extern "C" void find(int x);
2195 extern "C" void events();
2196
2197 // According to Windows API documentation, an illegal instruction sequence should generate
2198 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2199 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2200 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2201
2202 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2203
2204 // From "Execution Protection in the Windows Operating System" draft 0.35
2205 // Once a system header becomes available, the "real" define should be
2206 // included or copied here.
2207 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2208
2209 // Handle NAT Bit consumption on IA64.
2210 #ifdef _M_IA64
2211 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2212 #endif
2213
2214 // Windows Vista/2008 heap corruption check
2215 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2216
2217 #if _MSC_VER >= 1900
2218 #define def_excpt(val) #val, (int) val
2219 #else
2220 #define def_excpt(val) #val, val
2221 #endif
2222
2223 struct siglabel {
2224 char *name;
2225 int number;
2226 };
2227
2228 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2229 // C++ compiler contain this error code. Because this is a compiler-generated
2230 // error, the code is not listed in the Win32 API header files.
2231 // The code is actually a cryptic mnemonic device, with the initial "E"
2232 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2233 // ASCII values of "msc".
2234
2235 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2236
2237
2238 struct siglabel exceptlabels[] = {
2239 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2240 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2241 def_excpt(EXCEPTION_BREAKPOINT),
2242 def_excpt(EXCEPTION_SINGLE_STEP),
2243 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2244 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2245 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2246 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2247 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2248 def_excpt(EXCEPTION_FLT_OVERFLOW),
2249 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2250 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2251 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2252 def_excpt(EXCEPTION_INT_OVERFLOW),
2253 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2254 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2255 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2256 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2257 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2258 def_excpt(EXCEPTION_STACK_OVERFLOW),
2259 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2260 def_excpt(EXCEPTION_GUARD_PAGE),
2261 def_excpt(EXCEPTION_INVALID_HANDLE),
2262 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2263 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2264 #ifdef _M_IA64
2265 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2266 #endif
2267 NULL, 0
2268 };
2269
2270 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2271 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2272 if (exceptlabels[i].number == exception_code) {
2273 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2274 return buf;
2275 }
2276 }
2277
2278 return NULL;
2279 }
2280
2281 //-----------------------------------------------------------------------------
2282 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2283 // handle exception caused by idiv; should only happen for -MinInt/-1
2284 // (division by zero is handled explicitly)
2285 #ifdef _M_IA64
2286 assert(0, "Fix Handle_IDiv_Exception");
2287 #else
2288 #ifdef _M_AMD64
2289 PCONTEXT ctx = exceptionInfo->ContextRecord;
2290 address pc = (address)ctx->Rip;
2291 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2292 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2293 if (pc[0] == 0xF7) {
2294 // set correct result values and continue after idiv instruction
2295 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2296 } else {
2297 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2298 }
2299 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2300 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2301 // idiv opcode (0xF7).
2302 ctx->Rdx = (DWORD)0; // remainder
2303 // Continue the execution
2304 #else
2305 PCONTEXT ctx = exceptionInfo->ContextRecord;
2306 address pc = (address)ctx->Eip;
2307 assert(pc[0] == 0xF7, "not an idiv opcode");
2308 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2309 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2310 // set correct result values and continue after idiv instruction
2311 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2312 ctx->Eax = (DWORD)min_jint; // result
2313 ctx->Edx = (DWORD)0; // remainder
2314 // Continue the execution
2315 #endif
2316 #endif
2317 return EXCEPTION_CONTINUE_EXECUTION;
2318 }
2319
2320 //-----------------------------------------------------------------------------
2321 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2322 PCONTEXT ctx = exceptionInfo->ContextRecord;
2323 #ifndef _WIN64
2324 // handle exception caused by native method modifying control word
2325 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2326
2327 switch (exception_code) {
2328 case EXCEPTION_FLT_DENORMAL_OPERAND:
2329 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2330 case EXCEPTION_FLT_INEXACT_RESULT:
2331 case EXCEPTION_FLT_INVALID_OPERATION:
2332 case EXCEPTION_FLT_OVERFLOW:
2333 case EXCEPTION_FLT_STACK_CHECK:
2334 case EXCEPTION_FLT_UNDERFLOW:
2335 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2336 if (fp_control_word != ctx->FloatSave.ControlWord) {
2337 // Restore FPCW and mask out FLT exceptions
2338 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2339 // Mask out pending FLT exceptions
2340 ctx->FloatSave.StatusWord &= 0xffffff00;
2341 return EXCEPTION_CONTINUE_EXECUTION;
2342 }
2343 }
2344
2345 if (prev_uef_handler != NULL) {
2346 // We didn't handle this exception so pass it to the previous
2347 // UnhandledExceptionFilter.
2348 return (prev_uef_handler)(exceptionInfo);
2349 }
2350 #else // !_WIN64
2351 // On Windows, the mxcsr control bits are non-volatile across calls
2352 // See also CR 6192333
2353 //
2354 jint MxCsr = INITIAL_MXCSR;
2355 // we can't use StubRoutines::addr_mxcsr_std()
2356 // because in Win64 mxcsr is not saved there
2357 if (MxCsr != ctx->MxCsr) {
2358 ctx->MxCsr = MxCsr;
2359 return EXCEPTION_CONTINUE_EXECUTION;
2360 }
2361 #endif // !_WIN64
2362
2363 return EXCEPTION_CONTINUE_SEARCH;
2364 }
2365
2366 static inline void report_error(Thread* t, DWORD exception_code,
2367 address addr, void* siginfo, void* context) {
2368 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2369
2370 // If UseOsErrorReporting, this will return here and save the error file
2371 // somewhere where we can find it in the minidump.
2372 }
2373
2374 //-----------------------------------------------------------------------------
2375 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2376 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2377 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2378 #ifdef _M_IA64
2379 // On Itanium, we need the "precise pc", which has the slot number coded
2380 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2381 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2382 // Convert the pc to "Unix format", which has the slot number coded
2383 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2384 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2385 // information is saved in the Unix format.
2386 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2387 #else
2388 #ifdef _M_AMD64
2389 address pc = (address) exceptionInfo->ContextRecord->Rip;
2390 #else
2391 address pc = (address) exceptionInfo->ContextRecord->Eip;
2392 #endif
2393 #endif
2394 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2395
2396 // Handle SafeFetch32 and SafeFetchN exceptions.
2397 if (StubRoutines::is_safefetch_fault(pc)) {
2398 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2399 }
2400
2401 #ifndef _WIN64
2402 // Execution protection violation - win32 running on AMD64 only
2403 // Handled first to avoid misdiagnosis as a "normal" access violation;
2404 // This is safe to do because we have a new/unique ExceptionInformation
2405 // code for this condition.
2406 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2407 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2408 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2409 address addr = (address) exceptionRecord->ExceptionInformation[1];
2410
2411 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2412 int page_size = os::vm_page_size();
2413
2414 // Make sure the pc and the faulting address are sane.
2415 //
2416 // If an instruction spans a page boundary, and the page containing
2417 // the beginning of the instruction is executable but the following
2418 // page is not, the pc and the faulting address might be slightly
2419 // different - we still want to unguard the 2nd page in this case.
2420 //
2421 // 15 bytes seems to be a (very) safe value for max instruction size.
2422 bool pc_is_near_addr =
2423 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2424 bool instr_spans_page_boundary =
2425 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2426 (intptr_t) page_size) > 0);
2427
2428 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2429 static volatile address last_addr =
2430 (address) os::non_memory_address_word();
2431
2432 // In conservative mode, don't unguard unless the address is in the VM
2433 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2434 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2435
2436 // Set memory to RWX and retry
2437 address page_start =
2438 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2439 bool res = os::protect_memory((char*) page_start, page_size,
2440 os::MEM_PROT_RWX);
2441
2442 if (PrintMiscellaneous && Verbose) {
2443 char buf[256];
2444 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2445 "at " INTPTR_FORMAT
2446 ", unguarding " INTPTR_FORMAT ": %s", addr,
2447 page_start, (res ? "success" : strerror(errno)));
2448 tty->print_raw_cr(buf);
2449 }
2450
2451 // Set last_addr so if we fault again at the same address, we don't
2452 // end up in an endless loop.
2453 //
2454 // There are two potential complications here. Two threads trapping
2455 // at the same address at the same time could cause one of the
2456 // threads to think it already unguarded, and abort the VM. Likely
2457 // very rare.
2458 //
2459 // The other race involves two threads alternately trapping at
2460 // different addresses and failing to unguard the page, resulting in
2461 // an endless loop. This condition is probably even more unlikely
2462 // than the first.
2463 //
2464 // Although both cases could be avoided by using locks or thread
2465 // local last_addr, these solutions are unnecessary complication:
2466 // this handler is a best-effort safety net, not a complete solution.
2467 // It is disabled by default and should only be used as a workaround
2468 // in case we missed any no-execute-unsafe VM code.
2469
2470 last_addr = addr;
2471
2472 return EXCEPTION_CONTINUE_EXECUTION;
2473 }
2474 }
2475
2476 // Last unguard failed or not unguarding
2477 tty->print_raw_cr("Execution protection violation");
2478 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2479 exceptionInfo->ContextRecord);
2480 return EXCEPTION_CONTINUE_SEARCH;
2481 }
2482 }
2483 #endif // _WIN64
2484
2485 // Check to see if we caught the safepoint code in the
2486 // process of write protecting the memory serialization page.
2487 // It write enables the page immediately after protecting it
2488 // so just return.
2489 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2490 JavaThread* thread = (JavaThread*) t;
2491 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2492 address addr = (address) exceptionRecord->ExceptionInformation[1];
2493 if (os::is_memory_serialize_page(thread, addr)) {
2494 // Block current thread until the memory serialize page permission restored.
2495 os::block_on_serialize_page_trap();
2496 return EXCEPTION_CONTINUE_EXECUTION;
2497 }
2498 }
2499
2500 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2501 VM_Version::is_cpuinfo_segv_addr(pc)) {
2502 // Verify that OS save/restore AVX registers.
2503 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2504 }
2505
2506 if (t != NULL && t->is_Java_thread()) {
2507 JavaThread* thread = (JavaThread*) t;
2508 bool in_java = thread->thread_state() == _thread_in_Java;
2509
2510 // Handle potential stack overflows up front.
2511 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2512 if (os::uses_stack_guard_pages()) {
2513 #ifdef _M_IA64
2514 // Use guard page for register stack.
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 // Check for a register stack overflow on Itanium
2518 if (thread->addr_inside_register_stack_red_zone(addr)) {
2519 // Fatal red zone violation happens if the Java program
2520 // catches a StackOverflow error and does so much processing
2521 // that it runs beyond the unprotected yellow guard zone. As
2522 // a result, we are out of here.
2523 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2524 } else if(thread->addr_inside_register_stack(addr)) {
2525 // Disable the yellow zone which sets the state that
2526 // we've got a stack overflow problem.
2527 if (thread->stack_yellow_zone_enabled()) {
2528 thread->disable_stack_yellow_zone();
2529 }
2530 // Give us some room to process the exception.
2531 thread->disable_register_stack_guard();
2532 // Tracing with +Verbose.
2533 if (Verbose) {
2534 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2535 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2536 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2537 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2538 thread->register_stack_base(),
2539 thread->register_stack_base() + thread->stack_size());
2540 }
2541
2542 // Reguard the permanent register stack red zone just to be sure.
2543 // We saw Windows silently disabling this without telling us.
2544 thread->enable_register_stack_red_zone();
2545
2546 return Handle_Exception(exceptionInfo,
2547 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2548 }
2549 #endif
2550 if (thread->stack_yellow_zone_enabled()) {
2551 // Yellow zone violation. The o/s has unprotected the first yellow
2552 // zone page for us. Note: must call disable_stack_yellow_zone to
2553 // update the enabled status, even if the zone contains only one page.
2554 thread->disable_stack_yellow_zone();
2555 // If not in java code, return and hope for the best.
2556 return in_java
2557 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2558 : EXCEPTION_CONTINUE_EXECUTION;
2559 } else {
2560 // Fatal red zone violation.
2561 thread->disable_stack_red_zone();
2562 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2563 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2564 exceptionInfo->ContextRecord);
2565 return EXCEPTION_CONTINUE_SEARCH;
2566 }
2567 } else if (in_java) {
2568 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2569 // a one-time-only guard page, which it has released to us. The next
2570 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2571 return Handle_Exception(exceptionInfo,
2572 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2573 } else {
2574 // Can only return and hope for the best. Further stack growth will
2575 // result in an ACCESS_VIOLATION.
2576 return EXCEPTION_CONTINUE_EXECUTION;
2577 }
2578 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2579 // Either stack overflow or null pointer exception.
2580 if (in_java) {
2581 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2582 address addr = (address) exceptionRecord->ExceptionInformation[1];
2583 address stack_end = thread->stack_base() - thread->stack_size();
2584 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2585 // Stack overflow.
2586 assert(!os::uses_stack_guard_pages(),
2587 "should be caught by red zone code above.");
2588 return Handle_Exception(exceptionInfo,
2589 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2590 }
2591 // Check for safepoint polling and implicit null
2592 // We only expect null pointers in the stubs (vtable)
2593 // the rest are checked explicitly now.
2594 CodeBlob* cb = CodeCache::find_blob(pc);
2595 if (cb != NULL) {
2596 if (os::is_poll_address(addr)) {
2597 address stub = SharedRuntime::get_poll_stub(pc);
2598 return Handle_Exception(exceptionInfo, stub);
2599 }
2600 }
2601 {
2602 #ifdef _WIN64
2603 // If it's a legal stack address map the entire region in
2604 //
2605 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2606 address addr = (address) exceptionRecord->ExceptionInformation[1];
2607 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2608 addr = (address)((uintptr_t)addr &
2609 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2610 os::commit_memory((char *)addr, thread->stack_base() - addr,
2611 !ExecMem);
2612 return EXCEPTION_CONTINUE_EXECUTION;
2613 } else
2614 #endif
2615 {
2616 // Null pointer exception.
2617 #ifdef _M_IA64
2618 // Process implicit null checks in compiled code. Note: Implicit null checks
2619 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2620 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2621 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2622 // Handle implicit null check in UEP method entry
2623 if (cb && (cb->is_frame_complete_at(pc) ||
2624 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2625 if (Verbose) {
2626 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2627 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2628 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2629 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2630 *(bundle_start + 1), *bundle_start);
2631 }
2632 return Handle_Exception(exceptionInfo,
2633 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2634 }
2635 }
2636
2637 // Implicit null checks were processed above. Hence, we should not reach
2638 // here in the usual case => die!
2639 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2640 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2641 exceptionInfo->ContextRecord);
2642 return EXCEPTION_CONTINUE_SEARCH;
2643
2644 #else // !IA64
2645
2646 // Windows 98 reports faulting addresses incorrectly
2647 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2648 !os::win32::is_nt()) {
2649 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2650 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2651 }
2652 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2653 exceptionInfo->ContextRecord);
2654 return EXCEPTION_CONTINUE_SEARCH;
2655 #endif
2656 }
2657 }
2658 }
2659
2660 #ifdef _WIN64
2661 // Special care for fast JNI field accessors.
2662 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2663 // in and the heap gets shrunk before the field access.
2664 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2665 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2666 if (addr != (address)-1) {
2667 return Handle_Exception(exceptionInfo, addr);
2668 }
2669 }
2670 #endif
2671
2672 // Stack overflow or null pointer exception in native code.
2673 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2674 exceptionInfo->ContextRecord);
2675 return EXCEPTION_CONTINUE_SEARCH;
2676 } // /EXCEPTION_ACCESS_VIOLATION
2677 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2678 #if defined _M_IA64
2679 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2680 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2681 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2682
2683 // Compiled method patched to be non entrant? Following conditions must apply:
2684 // 1. must be first instruction in bundle
2685 // 2. must be a break instruction with appropriate code
2686 if ((((uint64_t) pc & 0x0F) == 0) &&
2687 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2688 return Handle_Exception(exceptionInfo,
2689 (address)SharedRuntime::get_handle_wrong_method_stub());
2690 }
2691 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2692 #endif
2693
2694
2695 if (in_java) {
2696 switch (exception_code) {
2697 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2698 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2699
2700 case EXCEPTION_INT_OVERFLOW:
2701 return Handle_IDiv_Exception(exceptionInfo);
2702
2703 } // switch
2704 }
2705 if (((thread->thread_state() == _thread_in_Java) ||
2706 (thread->thread_state() == _thread_in_native)) &&
2707 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2708 LONG result=Handle_FLT_Exception(exceptionInfo);
2709 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2710 }
2711 }
2712
2713 if (exception_code != EXCEPTION_BREAKPOINT) {
2714 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2715 exceptionInfo->ContextRecord);
2716 }
2717 return EXCEPTION_CONTINUE_SEARCH;
2718 }
2719
2720 #ifndef _WIN64
2721 // Special care for fast JNI accessors.
2722 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2723 // the heap gets shrunk before the field access.
2724 // Need to install our own structured exception handler since native code may
2725 // install its own.
2726 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2727 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2728 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2729 address pc = (address) exceptionInfo->ContextRecord->Eip;
2730 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2731 if (addr != (address)-1) {
2732 return Handle_Exception(exceptionInfo, addr);
2733 }
2734 }
2735 return EXCEPTION_CONTINUE_SEARCH;
2736 }
2737
2738 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2739 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2740 jobject obj, \
2741 jfieldID fieldID) { \
2742 __try { \
2743 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2744 obj, \
2745 fieldID); \
2746 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2747 _exception_info())) { \
2748 } \
2749 return 0; \
2750 }
2751
2752 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2753 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2754 DEFINE_FAST_GETFIELD(jchar, char, Char)
2755 DEFINE_FAST_GETFIELD(jshort, short, Short)
2756 DEFINE_FAST_GETFIELD(jint, int, Int)
2757 DEFINE_FAST_GETFIELD(jlong, long, Long)
2758 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2759 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2760
2761 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2762 switch (type) {
2763 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2764 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2765 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2766 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2767 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2768 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2769 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2770 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2771 default: ShouldNotReachHere();
2772 }
2773 return (address)-1;
2774 }
2775 #endif
2776
2777 // Virtual Memory
2778
2779 int os::vm_page_size() { return os::win32::vm_page_size(); }
2780 int os::vm_allocation_granularity() {
2781 return os::win32::vm_allocation_granularity();
2782 }
2783
2784 // Windows large page support is available on Windows 2003. In order to use
2785 // large page memory, the administrator must first assign additional privilege
2786 // to the user:
2787 // + select Control Panel -> Administrative Tools -> Local Security Policy
2788 // + select Local Policies -> User Rights Assignment
2789 // + double click "Lock pages in memory", add users and/or groups
2790 // + reboot
2791 // Note the above steps are needed for administrator as well, as administrators
2792 // by default do not have the privilege to lock pages in memory.
2793 //
2794 // Note about Windows 2003: although the API supports committing large page
2795 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2796 // scenario, I found through experiment it only uses large page if the entire
2797 // memory region is reserved and committed in a single VirtualAlloc() call.
2798 // This makes Windows large page support more or less like Solaris ISM, in
2799 // that the entire heap must be committed upfront. This probably will change
2800 // in the future, if so the code below needs to be revisited.
2801
2802 #ifndef MEM_LARGE_PAGES
2803 #define MEM_LARGE_PAGES 0x20000000
2804 #endif
2805
2806 static HANDLE _hProcess;
2807 static HANDLE _hToken;
2808
2809 // Container for NUMA node list info
2810 class NUMANodeListHolder {
2811 private:
2812 int *_numa_used_node_list; // allocated below
2813 int _numa_used_node_count;
2814
2815 void free_node_list() {
2816 if (_numa_used_node_list != NULL) {
2817 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2818 }
2819 }
2820
2821 public:
2822 NUMANodeListHolder() {
2823 _numa_used_node_count = 0;
2824 _numa_used_node_list = NULL;
2825 // do rest of initialization in build routine (after function pointers are set up)
2826 }
2827
2828 ~NUMANodeListHolder() {
2829 free_node_list();
2830 }
2831
2832 bool build() {
2833 DWORD_PTR proc_aff_mask;
2834 DWORD_PTR sys_aff_mask;
2835 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2836 ULONG highest_node_number;
2837 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2838 free_node_list();
2839 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2840 for (unsigned int i = 0; i <= highest_node_number; i++) {
2841 ULONGLONG proc_mask_numa_node;
2842 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2843 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2844 _numa_used_node_list[_numa_used_node_count++] = i;
2845 }
2846 }
2847 return (_numa_used_node_count > 1);
2848 }
2849
2850 int get_count() { return _numa_used_node_count; }
2851 int get_node_list_entry(int n) {
2852 // for indexes out of range, returns -1
2853 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2854 }
2855
2856 } numa_node_list_holder;
2857
2858
2859
2860 static size_t _large_page_size = 0;
2861
2862 static bool resolve_functions_for_large_page_init() {
2863 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2864 os::Advapi32Dll::AdvapiAvailable();
2865 }
2866
2867 static bool request_lock_memory_privilege() {
2868 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2869 os::current_process_id());
2870
2871 LUID luid;
2872 if (_hProcess != NULL &&
2873 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2874 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2875
2876 TOKEN_PRIVILEGES tp;
2877 tp.PrivilegeCount = 1;
2878 tp.Privileges[0].Luid = luid;
2879 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2880
2881 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2882 // privilege. Check GetLastError() too. See MSDN document.
2883 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2884 (GetLastError() == ERROR_SUCCESS)) {
2885 return true;
2886 }
2887 }
2888
2889 return false;
2890 }
2891
2892 static void cleanup_after_large_page_init() {
2893 if (_hProcess) CloseHandle(_hProcess);
2894 _hProcess = NULL;
2895 if (_hToken) CloseHandle(_hToken);
2896 _hToken = NULL;
2897 }
2898
2899 static bool numa_interleaving_init() {
2900 bool success = false;
2901 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2902
2903 // print a warning if UseNUMAInterleaving flag is specified on command line
2904 bool warn_on_failure = use_numa_interleaving_specified;
2905 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2906
2907 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2908 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2909 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2910
2911 if (os::Kernel32Dll::NumaCallsAvailable()) {
2912 if (numa_node_list_holder.build()) {
2913 if (PrintMiscellaneous && Verbose) {
2914 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2915 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2916 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2917 }
2918 tty->print("\n");
2919 }
2920 success = true;
2921 } else {
2922 WARN("Process does not cover multiple NUMA nodes.");
2923 }
2924 } else {
2925 WARN("NUMA Interleaving is not supported by the operating system.");
2926 }
2927 if (!success) {
2928 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2929 }
2930 return success;
2931 #undef WARN
2932 }
2933
2934 // this routine is used whenever we need to reserve a contiguous VA range
2935 // but we need to make separate VirtualAlloc calls for each piece of the range
2936 // Reasons for doing this:
2937 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2938 // * UseNUMAInterleaving requires a separate node for each piece
2939 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2940 DWORD prot,
2941 bool should_inject_error = false) {
2942 char * p_buf;
2943 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2944 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2945 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2946
2947 // first reserve enough address space in advance since we want to be
2948 // able to break a single contiguous virtual address range into multiple
2949 // large page commits but WS2003 does not allow reserving large page space
2950 // so we just use 4K pages for reserve, this gives us a legal contiguous
2951 // address space. then we will deallocate that reservation, and re alloc
2952 // using large pages
2953 const size_t size_of_reserve = bytes + chunk_size;
2954 if (bytes > size_of_reserve) {
2955 // Overflowed.
2956 return NULL;
2957 }
2958 p_buf = (char *) VirtualAlloc(addr,
2959 size_of_reserve, // size of Reserve
2960 MEM_RESERVE,
2961 PAGE_READWRITE);
2962 // If reservation failed, return NULL
2963 if (p_buf == NULL) return NULL;
2964 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2965 os::release_memory(p_buf, bytes + chunk_size);
2966
2967 // we still need to round up to a page boundary (in case we are using large pages)
2968 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2969 // instead we handle this in the bytes_to_rq computation below
2970 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2971
2972 // now go through and allocate one chunk at a time until all bytes are
2973 // allocated
2974 size_t bytes_remaining = bytes;
2975 // An overflow of align_size_up() would have been caught above
2976 // in the calculation of size_of_reserve.
2977 char * next_alloc_addr = p_buf;
2978 HANDLE hProc = GetCurrentProcess();
2979
2980 #ifdef ASSERT
2981 // Variable for the failure injection
2982 long ran_num = os::random();
2983 size_t fail_after = ran_num % bytes;
2984 #endif
2985
2986 int count=0;
2987 while (bytes_remaining) {
2988 // select bytes_to_rq to get to the next chunk_size boundary
2989
2990 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2991 // Note allocate and commit
2992 char * p_new;
2993
2994 #ifdef ASSERT
2995 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2996 #else
2997 const bool inject_error_now = false;
2998 #endif
2999
3000 if (inject_error_now) {
3001 p_new = NULL;
3002 } else {
3003 if (!UseNUMAInterleaving) {
3004 p_new = (char *) VirtualAlloc(next_alloc_addr,
3005 bytes_to_rq,
3006 flags,
3007 prot);
3008 } else {
3009 // get the next node to use from the used_node_list
3010 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3011 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3012 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3013 next_alloc_addr,
3014 bytes_to_rq,
3015 flags,
3016 prot,
3017 node);
3018 }
3019 }
3020
3021 if (p_new == NULL) {
3022 // Free any allocated pages
3023 if (next_alloc_addr > p_buf) {
3024 // Some memory was committed so release it.
3025 size_t bytes_to_release = bytes - bytes_remaining;
3026 // NMT has yet to record any individual blocks, so it
3027 // need to create a dummy 'reserve' record to match
3028 // the release.
3029 MemTracker::record_virtual_memory_reserve((address)p_buf,
3030 bytes_to_release, CALLER_PC);
3031 os::release_memory(p_buf, bytes_to_release);
3032 }
3033 #ifdef ASSERT
3034 if (should_inject_error) {
3035 if (TracePageSizes && Verbose) {
3036 tty->print_cr("Reserving pages individually failed.");
3037 }
3038 }
3039 #endif
3040 return NULL;
3041 }
3042
3043 bytes_remaining -= bytes_to_rq;
3044 next_alloc_addr += bytes_to_rq;
3045 count++;
3046 }
3047 // Although the memory is allocated individually, it is returned as one.
3048 // NMT records it as one block.
3049 if ((flags & MEM_COMMIT) != 0) {
3050 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3051 } else {
3052 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3053 }
3054
3055 // made it this far, success
3056 return p_buf;
3057 }
3058
3059
3060
3061 void os::large_page_init() {
3062 if (!UseLargePages) return;
3063
3064 // print a warning if any large page related flag is specified on command line
3065 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3066 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3067 bool success = false;
3068
3069 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3070 if (resolve_functions_for_large_page_init()) {
3071 if (request_lock_memory_privilege()) {
3072 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3073 if (s) {
3074 #if defined(IA32) || defined(AMD64)
3075 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3076 WARN("JVM cannot use large pages bigger than 4mb.");
3077 } else {
3078 #endif
3079 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3080 _large_page_size = LargePageSizeInBytes;
3081 } else {
3082 _large_page_size = s;
3083 }
3084 success = true;
3085 #if defined(IA32) || defined(AMD64)
3086 }
3087 #endif
3088 } else {
3089 WARN("Large page is not supported by the processor.");
3090 }
3091 } else {
3092 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3093 }
3094 } else {
3095 WARN("Large page is not supported by the operating system.");
3096 }
3097 #undef WARN
3098
3099 const size_t default_page_size = (size_t) vm_page_size();
3100 if (success && _large_page_size > default_page_size) {
3101 _page_sizes[0] = _large_page_size;
3102 _page_sizes[1] = default_page_size;
3103 _page_sizes[2] = 0;
3104 }
3105
3106 cleanup_after_large_page_init();
3107 UseLargePages = success;
3108 }
3109
3110 // On win32, one cannot release just a part of reserved memory, it's an
3111 // all or nothing deal. When we split a reservation, we must break the
3112 // reservation into two reservations.
3113 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3114 bool realloc) {
3115 if (size > 0) {
3116 release_memory(base, size);
3117 if (realloc) {
3118 reserve_memory(split, base);
3119 }
3120 if (size != split) {
3121 reserve_memory(size - split, base + split);
3122 }
3123 }
3124 }
3125
3126 // Multiple threads can race in this code but it's not possible to unmap small sections of
3127 // virtual space to get requested alignment, like posix-like os's.
3128 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3129 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3130 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3131 "Alignment must be a multiple of allocation granularity (page size)");
3132 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3133
3134 size_t extra_size = size + alignment;
3135 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3136
3137 char* aligned_base = NULL;
3138
3139 do {
3140 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3141 if (extra_base == NULL) {
3142 return NULL;
3143 }
3144 // Do manual alignment
3145 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3146
3147 os::release_memory(extra_base, extra_size);
3148
3149 aligned_base = os::reserve_memory(size, aligned_base);
3150
3151 } while (aligned_base == NULL);
3152
3153 return aligned_base;
3154 }
3155
3156 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3157 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3158 "reserve alignment");
3159 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3160 char* res;
3161 // note that if UseLargePages is on, all the areas that require interleaving
3162 // will go thru reserve_memory_special rather than thru here.
3163 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3164 if (!use_individual) {
3165 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3166 } else {
3167 elapsedTimer reserveTimer;
3168 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3169 // in numa interleaving, we have to allocate pages individually
3170 // (well really chunks of NUMAInterleaveGranularity size)
3171 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3172 if (res == NULL) {
3173 warning("NUMA page allocation failed");
3174 }
3175 if (Verbose && PrintMiscellaneous) {
3176 reserveTimer.stop();
3177 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3178 reserveTimer.milliseconds(), reserveTimer.ticks());
3179 }
3180 }
3181 assert(res == NULL || addr == NULL || addr == res,
3182 "Unexpected address from reserve.");
3183
3184 return res;
3185 }
3186
3187 // Reserve memory at an arbitrary address, only if that area is
3188 // available (and not reserved for something else).
3189 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3190 // Windows os::reserve_memory() fails of the requested address range is
3191 // not avilable.
3192 return reserve_memory(bytes, requested_addr);
3193 }
3194
3195 size_t os::large_page_size() {
3196 return _large_page_size;
3197 }
3198
3199 bool os::can_commit_large_page_memory() {
3200 // Windows only uses large page memory when the entire region is reserved
3201 // and committed in a single VirtualAlloc() call. This may change in the
3202 // future, but with Windows 2003 it's not possible to commit on demand.
3203 return false;
3204 }
3205
3206 bool os::can_execute_large_page_memory() {
3207 return true;
3208 }
3209
3210 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3211 bool exec) {
3212 assert(UseLargePages, "only for large pages");
3213
3214 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3215 return NULL; // Fallback to small pages.
3216 }
3217
3218 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3219 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3220
3221 // with large pages, there are two cases where we need to use Individual Allocation
3222 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3223 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3224 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3225 if (TracePageSizes && Verbose) {
3226 tty->print_cr("Reserving large pages individually.");
3227 }
3228 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3229 if (p_buf == NULL) {
3230 // give an appropriate warning message
3231 if (UseNUMAInterleaving) {
3232 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3233 }
3234 if (UseLargePagesIndividualAllocation) {
3235 warning("Individually allocated large pages failed, "
3236 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3237 }
3238 return NULL;
3239 }
3240
3241 return p_buf;
3242
3243 } else {
3244 if (TracePageSizes && Verbose) {
3245 tty->print_cr("Reserving large pages in a single large chunk.");
3246 }
3247 // normal policy just allocate it all at once
3248 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3249 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3250 if (res != NULL) {
3251 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3252 }
3253
3254 return res;
3255 }
3256 }
3257
3258 bool os::release_memory_special(char* base, size_t bytes) {
3259 assert(base != NULL, "Sanity check");
3260 return release_memory(base, bytes);
3261 }
3262
3263 void os::print_statistics() {
3264 }
3265
3266 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3267 int err = os::get_last_error();
3268 char buf[256];
3269 size_t buf_len = os::lasterror(buf, sizeof(buf));
3270 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3271 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3272 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3273 }
3274
3275 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3276 if (bytes == 0) {
3277 // Don't bother the OS with noops.
3278 return true;
3279 }
3280 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3281 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3282 // Don't attempt to print anything if the OS call fails. We're
3283 // probably low on resources, so the print itself may cause crashes.
3284
3285 // unless we have NUMAInterleaving enabled, the range of a commit
3286 // is always within a reserve covered by a single VirtualAlloc
3287 // in that case we can just do a single commit for the requested size
3288 if (!UseNUMAInterleaving) {
3289 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3290 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3291 return false;
3292 }
3293 if (exec) {
3294 DWORD oldprot;
3295 // Windows doc says to use VirtualProtect to get execute permissions
3296 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3297 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3298 return false;
3299 }
3300 }
3301 return true;
3302 } else {
3303
3304 // when NUMAInterleaving is enabled, the commit might cover a range that
3305 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3306 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3307 // returns represents the number of bytes that can be committed in one step.
3308 size_t bytes_remaining = bytes;
3309 char * next_alloc_addr = addr;
3310 while (bytes_remaining > 0) {
3311 MEMORY_BASIC_INFORMATION alloc_info;
3312 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3313 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3314 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3315 PAGE_READWRITE) == NULL) {
3316 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3317 exec);)
3318 return false;
3319 }
3320 if (exec) {
3321 DWORD oldprot;
3322 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3323 PAGE_EXECUTE_READWRITE, &oldprot)) {
3324 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3325 exec);)
3326 return false;
3327 }
3328 }
3329 bytes_remaining -= bytes_to_rq;
3330 next_alloc_addr += bytes_to_rq;
3331 }
3332 }
3333 // if we made it this far, return true
3334 return true;
3335 }
3336
3337 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3338 bool exec) {
3339 // alignment_hint is ignored on this OS
3340 return pd_commit_memory(addr, size, exec);
3341 }
3342
3343 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3344 const char* mesg) {
3345 assert(mesg != NULL, "mesg must be specified");
3346 if (!pd_commit_memory(addr, size, exec)) {
3347 warn_fail_commit_memory(addr, size, exec);
3348 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3349 }
3350 }
3351
3352 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3353 size_t alignment_hint, bool exec,
3354 const char* mesg) {
3355 // alignment_hint is ignored on this OS
3356 pd_commit_memory_or_exit(addr, size, exec, mesg);
3357 }
3358
3359 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3360 if (bytes == 0) {
3361 // Don't bother the OS with noops.
3362 return true;
3363 }
3364 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3365 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3366 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3367 }
3368
3369 bool os::pd_release_memory(char* addr, size_t bytes) {
3370 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3371 }
3372
3373 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3374 return os::commit_memory(addr, size, !ExecMem);
3375 }
3376
3377 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3378 return os::uncommit_memory(addr, size);
3379 }
3380
3381 // Set protections specified
3382 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3383 bool is_committed) {
3384 unsigned int p = 0;
3385 switch (prot) {
3386 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3387 case MEM_PROT_READ: p = PAGE_READONLY; break;
3388 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3389 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3390 default:
3391 ShouldNotReachHere();
3392 }
3393
3394 DWORD old_status;
3395
3396 // Strange enough, but on Win32 one can change protection only for committed
3397 // memory, not a big deal anyway, as bytes less or equal than 64K
3398 if (!is_committed) {
3399 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3400 "cannot commit protection page");
3401 }
3402 // One cannot use os::guard_memory() here, as on Win32 guard page
3403 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3404 //
3405 // Pages in the region become guard pages. Any attempt to access a guard page
3406 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3407 // the guard page status. Guard pages thus act as a one-time access alarm.
3408 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3409 }
3410
3411 bool os::guard_memory(char* addr, size_t bytes) {
3412 DWORD old_status;
3413 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3414 }
3415
3416 bool os::unguard_memory(char* addr, size_t bytes) {
3417 DWORD old_status;
3418 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3419 }
3420
3421 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3422 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3423 void os::numa_make_global(char *addr, size_t bytes) { }
3424 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3425 bool os::numa_topology_changed() { return false; }
3426 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3427 int os::numa_get_group_id() { return 0; }
3428 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3429 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3430 // Provide an answer for UMA systems
3431 ids[0] = 0;
3432 return 1;
3433 } else {
3434 // check for size bigger than actual groups_num
3435 size = MIN2(size, numa_get_groups_num());
3436 for (int i = 0; i < (int)size; i++) {
3437 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3438 }
3439 return size;
3440 }
3441 }
3442
3443 bool os::get_page_info(char *start, page_info* info) {
3444 return false;
3445 }
3446
3447 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3448 page_info* page_found) {
3449 return end;
3450 }
3451
3452 char* os::non_memory_address_word() {
3453 // Must never look like an address returned by reserve_memory,
3454 // even in its subfields (as defined by the CPU immediate fields,
3455 // if the CPU splits constants across multiple instructions).
3456 return (char*)-1;
3457 }
3458
3459 #define MAX_ERROR_COUNT 100
3460 #define SYS_THREAD_ERROR 0xffffffffUL
3461
3462 void os::pd_start_thread(Thread* thread) {
3463 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3464 // Returns previous suspend state:
3465 // 0: Thread was not suspended
3466 // 1: Thread is running now
3467 // >1: Thread is still suspended.
3468 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3469 }
3470
3471 class HighResolutionInterval : public CHeapObj<mtThread> {
3472 // The default timer resolution seems to be 10 milliseconds.
3473 // (Where is this written down?)
3474 // If someone wants to sleep for only a fraction of the default,
3475 // then we set the timer resolution down to 1 millisecond for
3476 // the duration of their interval.
3477 // We carefully set the resolution back, since otherwise we
3478 // seem to incur an overhead (3%?) that we don't need.
3479 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3480 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3481 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3482 // timeBeginPeriod() if the relative error exceeded some threshold.
3483 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3484 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3485 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3486 // resolution timers running.
3487 private:
3488 jlong resolution;
3489 public:
3490 HighResolutionInterval(jlong ms) {
3491 resolution = ms % 10L;
3492 if (resolution != 0) {
3493 MMRESULT result = timeBeginPeriod(1L);
3494 }
3495 }
3496 ~HighResolutionInterval() {
3497 if (resolution != 0) {
3498 MMRESULT result = timeEndPeriod(1L);
3499 }
3500 resolution = 0L;
3501 }
3502 };
3503
3504 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3505 jlong limit = (jlong) MAXDWORD;
3506
3507 while (ms > limit) {
3508 int res;
3509 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3510 return res;
3511 }
3512 ms -= limit;
3513 }
3514
3515 assert(thread == Thread::current(), "thread consistency check");
3516 OSThread* osthread = thread->osthread();
3517 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3518 int result;
3519 if (interruptable) {
3520 assert(thread->is_Java_thread(), "must be java thread");
3521 JavaThread *jt = (JavaThread *) thread;
3522 ThreadBlockInVM tbivm(jt);
3523
3524 jt->set_suspend_equivalent();
3525 // cleared by handle_special_suspend_equivalent_condition() or
3526 // java_suspend_self() via check_and_wait_while_suspended()
3527
3528 HANDLE events[1];
3529 events[0] = osthread->interrupt_event();
3530 HighResolutionInterval *phri=NULL;
3531 if (!ForceTimeHighResolution) {
3532 phri = new HighResolutionInterval(ms);
3533 }
3534 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3535 result = OS_TIMEOUT;
3536 } else {
3537 ResetEvent(osthread->interrupt_event());
3538 osthread->set_interrupted(false);
3539 result = OS_INTRPT;
3540 }
3541 delete phri; //if it is NULL, harmless
3542
3543 // were we externally suspended while we were waiting?
3544 jt->check_and_wait_while_suspended();
3545 } else {
3546 assert(!thread->is_Java_thread(), "must not be java thread");
3547 Sleep((long) ms);
3548 result = OS_TIMEOUT;
3549 }
3550 return result;
3551 }
3552
3553 // Short sleep, direct OS call.
3554 //
3555 // ms = 0, means allow others (if any) to run.
3556 //
3557 void os::naked_short_sleep(jlong ms) {
3558 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3559 Sleep(ms);
3560 }
3561
3562 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3563 void os::infinite_sleep() {
3564 while (true) { // sleep forever ...
3565 Sleep(100000); // ... 100 seconds at a time
3566 }
3567 }
3568
3569 typedef BOOL (WINAPI * STTSignature)(void);
3570
3571 void os::naked_yield() {
3572 // Use either SwitchToThread() or Sleep(0)
3573 // Consider passing back the return value from SwitchToThread().
3574 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3575 SwitchToThread();
3576 } else {
3577 Sleep(0);
3578 }
3579 }
3580
3581 // Win32 only gives you access to seven real priorities at a time,
3582 // so we compress Java's ten down to seven. It would be better
3583 // if we dynamically adjusted relative priorities.
3584
3585 int os::java_to_os_priority[CriticalPriority + 1] = {
3586 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3587 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3588 THREAD_PRIORITY_LOWEST, // 2
3589 THREAD_PRIORITY_BELOW_NORMAL, // 3
3590 THREAD_PRIORITY_BELOW_NORMAL, // 4
3591 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3592 THREAD_PRIORITY_NORMAL, // 6
3593 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3594 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3595 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3596 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3597 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3598 };
3599
3600 int prio_policy1[CriticalPriority + 1] = {
3601 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3602 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3603 THREAD_PRIORITY_LOWEST, // 2
3604 THREAD_PRIORITY_BELOW_NORMAL, // 3
3605 THREAD_PRIORITY_BELOW_NORMAL, // 4
3606 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3607 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3608 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3609 THREAD_PRIORITY_HIGHEST, // 8
3610 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3611 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3612 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3613 };
3614
3615 static int prio_init() {
3616 // If ThreadPriorityPolicy is 1, switch tables
3617 if (ThreadPriorityPolicy == 1) {
3618 int i;
3619 for (i = 0; i < CriticalPriority + 1; i++) {
3620 os::java_to_os_priority[i] = prio_policy1[i];
3621 }
3622 }
3623 if (UseCriticalJavaThreadPriority) {
3624 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3625 }
3626 return 0;
3627 }
3628
3629 OSReturn os::set_native_priority(Thread* thread, int priority) {
3630 if (!UseThreadPriorities) return OS_OK;
3631 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3632 return ret ? OS_OK : OS_ERR;
3633 }
3634
3635 OSReturn os::get_native_priority(const Thread* const thread,
3636 int* priority_ptr) {
3637 if (!UseThreadPriorities) {
3638 *priority_ptr = java_to_os_priority[NormPriority];
3639 return OS_OK;
3640 }
3641 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3642 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3643 assert(false, "GetThreadPriority failed");
3644 return OS_ERR;
3645 }
3646 *priority_ptr = os_prio;
3647 return OS_OK;
3648 }
3649
3650
3651 // Hint to the underlying OS that a task switch would not be good.
3652 // Void return because it's a hint and can fail.
3653 void os::hint_no_preempt() {}
3654
3655 void os::interrupt(Thread* thread) {
3656 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3657 Threads_lock->owned_by_self(),
3658 "possibility of dangling Thread pointer");
3659
3660 OSThread* osthread = thread->osthread();
3661 osthread->set_interrupted(true);
3662 // More than one thread can get here with the same value of osthread,
3663 // resulting in multiple notifications. We do, however, want the store
3664 // to interrupted() to be visible to other threads before we post
3665 // the interrupt event.
3666 OrderAccess::release();
3667 SetEvent(osthread->interrupt_event());
3668 // For JSR166: unpark after setting status
3669 if (thread->is_Java_thread()) {
3670 ((JavaThread*)thread)->parker()->unpark();
3671 }
3672
3673 ParkEvent * ev = thread->_ParkEvent;
3674 if (ev != NULL) ev->unpark();
3675 }
3676
3677
3678 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3679 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3680 "possibility of dangling Thread pointer");
3681
3682 OSThread* osthread = thread->osthread();
3683 // There is no synchronization between the setting of the interrupt
3684 // and it being cleared here. It is critical - see 6535709 - that
3685 // we only clear the interrupt state, and reset the interrupt event,
3686 // if we are going to report that we were indeed interrupted - else
3687 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3688 // depending on the timing. By checking thread interrupt event to see
3689 // if the thread gets real interrupt thus prevent spurious wakeup.
3690 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3691 if (interrupted && clear_interrupted) {
3692 osthread->set_interrupted(false);
3693 ResetEvent(osthread->interrupt_event());
3694 } // Otherwise leave the interrupted state alone
3695
3696 return interrupted;
3697 }
3698
3699 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3700 ExtendedPC os::get_thread_pc(Thread* thread) {
3701 CONTEXT context;
3702 context.ContextFlags = CONTEXT_CONTROL;
3703 HANDLE handle = thread->osthread()->thread_handle();
3704 #ifdef _M_IA64
3705 assert(0, "Fix get_thread_pc");
3706 return ExtendedPC(NULL);
3707 #else
3708 if (GetThreadContext(handle, &context)) {
3709 #ifdef _M_AMD64
3710 return ExtendedPC((address) context.Rip);
3711 #else
3712 return ExtendedPC((address) context.Eip);
3713 #endif
3714 } else {
3715 return ExtendedPC(NULL);
3716 }
3717 #endif
3718 }
3719
3720 // GetCurrentThreadId() returns DWORD
3721 intx os::current_thread_id() { return GetCurrentThreadId(); }
3722
3723 static int _initial_pid = 0;
3724
3725 int os::current_process_id() {
3726 return (_initial_pid ? _initial_pid : _getpid());
3727 }
3728
3729 int os::win32::_vm_page_size = 0;
3730 int os::win32::_vm_allocation_granularity = 0;
3731 int os::win32::_processor_type = 0;
3732 // Processor level is not available on non-NT systems, use vm_version instead
3733 int os::win32::_processor_level = 0;
3734 julong os::win32::_physical_memory = 0;
3735 size_t os::win32::_default_stack_size = 0;
3736
3737 intx os::win32::_os_thread_limit = 0;
3738 volatile intx os::win32::_os_thread_count = 0;
3739
3740 bool os::win32::_is_nt = false;
3741 bool os::win32::_is_windows_2003 = false;
3742 bool os::win32::_is_windows_server = false;
3743
3744 // 6573254
3745 // Currently, the bug is observed across all the supported Windows releases,
3746 // including the latest one (as of this writing - Windows Server 2012 R2)
3747 bool os::win32::_has_exit_bug = true;
3748 bool os::win32::_has_performance_count = 0;
3749
3750 void os::win32::initialize_system_info() {
3751 SYSTEM_INFO si;
3752 GetSystemInfo(&si);
3753 _vm_page_size = si.dwPageSize;
3754 _vm_allocation_granularity = si.dwAllocationGranularity;
3755 _processor_type = si.dwProcessorType;
3756 _processor_level = si.wProcessorLevel;
3757 set_processor_count(si.dwNumberOfProcessors);
3758
3759 MEMORYSTATUSEX ms;
3760 ms.dwLength = sizeof(ms);
3761
3762 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3763 // dwMemoryLoad (% of memory in use)
3764 GlobalMemoryStatusEx(&ms);
3765 _physical_memory = ms.ullTotalPhys;
3766
3767 OSVERSIONINFOEX oi;
3768 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3769 GetVersionEx((OSVERSIONINFO*)&oi);
3770 switch (oi.dwPlatformId) {
3771 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3772 case VER_PLATFORM_WIN32_NT:
3773 _is_nt = true;
3774 {
3775 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3776 if (os_vers == 5002) {
3777 _is_windows_2003 = true;
3778 }
3779 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3780 oi.wProductType == VER_NT_SERVER) {
3781 _is_windows_server = true;
3782 }
3783 }
3784 break;
3785 default: fatal("Unknown platform");
3786 }
3787
3788 _default_stack_size = os::current_stack_size();
3789 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3790 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3791 "stack size not a multiple of page size");
3792
3793 initialize_performance_counter();
3794 }
3795
3796
3797 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3798 int ebuflen) {
3799 char path[MAX_PATH];
3800 DWORD size;
3801 DWORD pathLen = (DWORD)sizeof(path);
3802 HINSTANCE result = NULL;
3803
3804 // only allow library name without path component
3805 assert(strchr(name, '\\') == NULL, "path not allowed");
3806 assert(strchr(name, ':') == NULL, "path not allowed");
3807 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3808 jio_snprintf(ebuf, ebuflen,
3809 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3810 return NULL;
3811 }
3812
3813 // search system directory
3814 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3815 if (size >= pathLen) {
3816 return NULL; // truncated
3817 }
3818 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3819 return NULL; // truncated
3820 }
3821 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3822 return result;
3823 }
3824 }
3825
3826 // try Windows directory
3827 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3828 if (size >= pathLen) {
3829 return NULL; // truncated
3830 }
3831 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3832 return NULL; // truncated
3833 }
3834 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3835 return result;
3836 }
3837 }
3838
3839 jio_snprintf(ebuf, ebuflen,
3840 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3841 return NULL;
3842 }
3843
3844 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3845
3846 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3847 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3848 return TRUE;
3849 }
3850
3851 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3852 // Basic approach:
3853 // - Each exiting thread registers its intent to exit and then does so.
3854 // - A thread trying to terminate the process must wait for all
3855 // threads currently exiting to complete their exit.
3856
3857 if (os::win32::has_exit_bug()) {
3858 // The array holds handles of the threads that have started exiting by calling
3859 // _endthreadex().
3860 // Should be large enough to avoid blocking the exiting thread due to lack of
3861 // a free slot.
3862 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3863 static int handle_count = 0;
3864
3865 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3866 static CRITICAL_SECTION crit_sect;
3867 static volatile jint process_exiting = 0;
3868 int i, j;
3869 DWORD res;
3870 HANDLE hproc, hthr;
3871
3872 // The first thread that reached this point, initializes the critical section.
3873 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3874 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3875 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3876 EnterCriticalSection(&crit_sect);
3877
3878 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3879 // Remove from the array those handles of the threads that have completed exiting.
3880 for (i = 0, j = 0; i < handle_count; ++i) {
3881 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3882 if (res == WAIT_TIMEOUT) {
3883 handles[j++] = handles[i];
3884 } else {
3885 if (res == WAIT_FAILED) {
3886 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3887 GetLastError(), __FILE__, __LINE__);
3888 }
3889 // Don't keep the handle, if we failed waiting for it.
3890 CloseHandle(handles[i]);
3891 }
3892 }
3893
3894 // If there's no free slot in the array of the kept handles, we'll have to
3895 // wait until at least one thread completes exiting.
3896 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3897 // Raise the priority of the oldest exiting thread to increase its chances
3898 // to complete sooner.
3899 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3900 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3901 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3902 i = (res - WAIT_OBJECT_0);
3903 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3904 for (; i < handle_count; ++i) {
3905 handles[i] = handles[i + 1];
3906 }
3907 } else {
3908 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3909 (res == WAIT_FAILED ? "failed" : "timed out"),
3910 GetLastError(), __FILE__, __LINE__);
3911 // Don't keep handles, if we failed waiting for them.
3912 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3913 CloseHandle(handles[i]);
3914 }
3915 handle_count = 0;
3916 }
3917 }
3918
3919 // Store a duplicate of the current thread handle in the array of handles.
3920 hproc = GetCurrentProcess();
3921 hthr = GetCurrentThread();
3922 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3923 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3924 warning("DuplicateHandle failed (%u) in %s: %d\n",
3925 GetLastError(), __FILE__, __LINE__);
3926 } else {
3927 ++handle_count;
3928 }
3929
3930 // The current exiting thread has stored its handle in the array, and now
3931 // should leave the critical section before calling _endthreadex().
3932
3933 } else if (what != EPT_THREAD) {
3934 if (handle_count > 0) {
3935 // Before ending the process, make sure all the threads that had called
3936 // _endthreadex() completed.
3937
3938 // Set the priority level of the current thread to the same value as
3939 // the priority level of exiting threads.
3940 // This is to ensure it will be given a fair chance to execute if
3941 // the timeout expires.
3942 hthr = GetCurrentThread();
3943 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3944 for (i = 0; i < handle_count; ++i) {
3945 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3946 }
3947 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3948 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3949 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3950 (res == WAIT_FAILED ? "failed" : "timed out"),
3951 GetLastError(), __FILE__, __LINE__);
3952 }
3953 for (i = 0; i < handle_count; ++i) {
3954 CloseHandle(handles[i]);
3955 }
3956 handle_count = 0;
3957 }
3958
3959 OrderAccess::release_store(&process_exiting, 1);
3960 }
3961
3962 LeaveCriticalSection(&crit_sect);
3963 }
3964
3965 if (what == EPT_THREAD) {
3966 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3967 // Some other thread is about to call exit(), so we
3968 // don't let the current thread proceed to _endthreadex()
3969 SuspendThread(GetCurrentThread());
3970 // Avoid busy-wait loop, if SuspendThread() failed.
3971 Sleep(EXIT_TIMEOUT);
3972 }
3973 }
3974 }
3975
3976 // We are here if either
3977 // - there's no 'race at exit' bug on this OS release;
3978 // - initialization of the critical section failed (unlikely);
3979 // - the current thread has stored its handle and left the critical section;
3980 // - the process-exiting thread has raised the flag and left the critical section.
3981 if (what == EPT_THREAD) {
3982 _endthreadex((unsigned)exit_code);
3983 } else if (what == EPT_PROCESS) {
3984 ::exit(exit_code);
3985 } else {
3986 _exit(exit_code);
3987 }
3988
3989 // Should not reach here
3990 return exit_code;
3991 }
3992
3993 #undef EXIT_TIMEOUT
3994
3995 void os::win32::setmode_streams() {
3996 _setmode(_fileno(stdin), _O_BINARY);
3997 _setmode(_fileno(stdout), _O_BINARY);
3998 _setmode(_fileno(stderr), _O_BINARY);
3999 }
4000
4001
4002 bool os::is_debugger_attached() {
4003 return IsDebuggerPresent() ? true : false;
4004 }
4005
4006
4007 void os::wait_for_keypress_at_exit(void) {
4008 if (PauseAtExit) {
4009 fprintf(stderr, "Press any key to continue...\n");
4010 fgetc(stdin);
4011 }
4012 }
4013
4014
4015 int os::message_box(const char* title, const char* message) {
4016 int result = MessageBox(NULL, message, title,
4017 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4018 return result == IDYES;
4019 }
4020
4021 int os::allocate_thread_local_storage() {
4022 return TlsAlloc();
4023 }
4024
4025
4026 void os::free_thread_local_storage(int index) {
4027 TlsFree(index);
4028 }
4029
4030
4031 void os::thread_local_storage_at_put(int index, void* value) {
4032 TlsSetValue(index, value);
4033 assert(thread_local_storage_at(index) == value, "Just checking");
4034 }
4035
4036
4037 void* os::thread_local_storage_at(int index) {
4038 return TlsGetValue(index);
4039 }
4040
4041
4042 #ifndef PRODUCT
4043 #ifndef _WIN64
4044 // Helpers to check whether NX protection is enabled
4045 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4046 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4047 pex->ExceptionRecord->NumberParameters > 0 &&
4048 pex->ExceptionRecord->ExceptionInformation[0] ==
4049 EXCEPTION_INFO_EXEC_VIOLATION) {
4050 return EXCEPTION_EXECUTE_HANDLER;
4051 }
4052 return EXCEPTION_CONTINUE_SEARCH;
4053 }
4054
4055 void nx_check_protection() {
4056 // If NX is enabled we'll get an exception calling into code on the stack
4057 char code[] = { (char)0xC3 }; // ret
4058 void *code_ptr = (void *)code;
4059 __try {
4060 __asm call code_ptr
4061 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4062 tty->print_raw_cr("NX protection detected.");
4063 }
4064 }
4065 #endif // _WIN64
4066 #endif // PRODUCT
4067
4068 // this is called _before_ the global arguments have been parsed
4069 void os::init(void) {
4070 _initial_pid = _getpid();
4071
4072 init_random(1234567);
4073
4074 win32::initialize_system_info();
4075 win32::setmode_streams();
4076 init_page_sizes((size_t) win32::vm_page_size());
4077
4078 // This may be overridden later when argument processing is done.
4079 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4080 os::win32::is_windows_2003());
4081
4082 // Initialize main_process and main_thread
4083 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4084 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4085 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4086 fatal("DuplicateHandle failed\n");
4087 }
4088 main_thread_id = (int) GetCurrentThreadId();
4089 }
4090
4091 // To install functions for atexit processing
4092 extern "C" {
4093 static void perfMemory_exit_helper() {
4094 perfMemory_exit();
4095 }
4096 }
4097
4098 static jint initSock();
4099
4100 // this is called _after_ the global arguments have been parsed
4101 jint os::init_2(void) {
4102 // Allocate a single page and mark it as readable for safepoint polling
4103 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4104 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4105
4106 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4107 guarantee(return_page != NULL, "Commit Failed for polling page");
4108
4109 os::set_polling_page(polling_page);
4110
4111 #ifndef PRODUCT
4112 if (Verbose && PrintMiscellaneous) {
4113 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4114 (intptr_t)polling_page);
4115 }
4116 #endif
4117
4118 if (!UseMembar) {
4119 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4120 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4121
4122 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4123 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4124
4125 os::set_memory_serialize_page(mem_serialize_page);
4126
4127 #ifndef PRODUCT
4128 if (Verbose && PrintMiscellaneous) {
4129 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4130 (intptr_t)mem_serialize_page);
4131 }
4132 #endif
4133 }
4134
4135 // Setup Windows Exceptions
4136
4137 // for debugging float code generation bugs
4138 if (ForceFloatExceptions) {
4139 #ifndef _WIN64
4140 static long fp_control_word = 0;
4141 __asm { fstcw fp_control_word }
4142 // see Intel PPro Manual, Vol. 2, p 7-16
4143 const long precision = 0x20;
4144 const long underflow = 0x10;
4145 const long overflow = 0x08;
4146 const long zero_div = 0x04;
4147 const long denorm = 0x02;
4148 const long invalid = 0x01;
4149 fp_control_word |= invalid;
4150 __asm { fldcw fp_control_word }
4151 #endif
4152 }
4153
4154 // If stack_commit_size is 0, windows will reserve the default size,
4155 // but only commit a small portion of it.
4156 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4157 size_t default_reserve_size = os::win32::default_stack_size();
4158 size_t actual_reserve_size = stack_commit_size;
4159 if (stack_commit_size < default_reserve_size) {
4160 // If stack_commit_size == 0, we want this too
4161 actual_reserve_size = default_reserve_size;
4162 }
4163
4164 // Check minimum allowable stack size for thread creation and to initialize
4165 // the java system classes, including StackOverflowError - depends on page
4166 // size. Add a page for compiler2 recursion in main thread.
4167 // Add in 2*BytesPerWord times page size to account for VM stack during
4168 // class initialization depending on 32 or 64 bit VM.
4169 size_t min_stack_allowed =
4170 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4171 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4172 if (actual_reserve_size < min_stack_allowed) {
4173 tty->print_cr("\nThe stack size specified is too small, "
4174 "Specify at least %dk",
4175 min_stack_allowed / K);
4176 return JNI_ERR;
4177 }
4178
4179 JavaThread::set_stack_size_at_create(stack_commit_size);
4180
4181 // Calculate theoretical max. size of Threads to guard gainst artifical
4182 // out-of-memory situations, where all available address-space has been
4183 // reserved by thread stacks.
4184 assert(actual_reserve_size != 0, "Must have a stack");
4185
4186 // Calculate the thread limit when we should start doing Virtual Memory
4187 // banging. Currently when the threads will have used all but 200Mb of space.
4188 //
4189 // TODO: consider performing a similar calculation for commit size instead
4190 // as reserve size, since on a 64-bit platform we'll run into that more
4191 // often than running out of virtual memory space. We can use the
4192 // lower value of the two calculations as the os_thread_limit.
4193 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4194 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4195
4196 // at exit methods are called in the reverse order of their registration.
4197 // there is no limit to the number of functions registered. atexit does
4198 // not set errno.
4199
4200 if (PerfAllowAtExitRegistration) {
4201 // only register atexit functions if PerfAllowAtExitRegistration is set.
4202 // atexit functions can be delayed until process exit time, which
4203 // can be problematic for embedded VM situations. Embedded VMs should
4204 // call DestroyJavaVM() to assure that VM resources are released.
4205
4206 // note: perfMemory_exit_helper atexit function may be removed in
4207 // the future if the appropriate cleanup code can be added to the
4208 // VM_Exit VMOperation's doit method.
4209 if (atexit(perfMemory_exit_helper) != 0) {
4210 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4211 }
4212 }
4213
4214 #ifndef _WIN64
4215 // Print something if NX is enabled (win32 on AMD64)
4216 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4217 #endif
4218
4219 // initialize thread priority policy
4220 prio_init();
4221
4222 if (UseNUMA && !ForceNUMA) {
4223 UseNUMA = false; // We don't fully support this yet
4224 }
4225
4226 if (UseNUMAInterleaving) {
4227 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4228 bool success = numa_interleaving_init();
4229 if (!success) UseNUMAInterleaving = false;
4230 }
4231
4232 if (initSock() != JNI_OK) {
4233 return JNI_ERR;
4234 }
4235
4236 return JNI_OK;
4237 }
4238
4239 // Mark the polling page as unreadable
4240 void os::make_polling_page_unreadable(void) {
4241 DWORD old_status;
4242 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4243 PAGE_NOACCESS, &old_status)) {
4244 fatal("Could not disable polling page");
4245 }
4246 }
4247
4248 // Mark the polling page as readable
4249 void os::make_polling_page_readable(void) {
4250 DWORD old_status;
4251 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4252 PAGE_READONLY, &old_status)) {
4253 fatal("Could not enable polling page");
4254 }
4255 }
4256
4257
4258 int os::stat(const char *path, struct stat *sbuf) {
4259 char pathbuf[MAX_PATH];
4260 if (strlen(path) > MAX_PATH - 1) {
4261 errno = ENAMETOOLONG;
4262 return -1;
4263 }
4264 os::native_path(strcpy(pathbuf, path));
4265 int ret = ::stat(pathbuf, sbuf);
4266 if (sbuf != NULL && UseUTCFileTimestamp) {
4267 // Fix for 6539723. st_mtime returned from stat() is dependent on
4268 // the system timezone and so can return different values for the
4269 // same file if/when daylight savings time changes. This adjustment
4270 // makes sure the same timestamp is returned regardless of the TZ.
4271 //
4272 // See:
4273 // http://msdn.microsoft.com/library/
4274 // default.asp?url=/library/en-us/sysinfo/base/
4275 // time_zone_information_str.asp
4276 // and
4277 // http://msdn.microsoft.com/library/default.asp?url=
4278 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4279 //
4280 // NOTE: there is a insidious bug here: If the timezone is changed
4281 // after the call to stat() but before 'GetTimeZoneInformation()', then
4282 // the adjustment we do here will be wrong and we'll return the wrong
4283 // value (which will likely end up creating an invalid class data
4284 // archive). Absent a better API for this, or some time zone locking
4285 // mechanism, we'll have to live with this risk.
4286 TIME_ZONE_INFORMATION tz;
4287 DWORD tzid = GetTimeZoneInformation(&tz);
4288 int daylightBias =
4289 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4290 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4291 }
4292 return ret;
4293 }
4294
4295
4296 #define FT2INT64(ft) \
4297 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4298
4299
4300 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4301 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4302 // of a thread.
4303 //
4304 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4305 // the fast estimate available on the platform.
4306
4307 // current_thread_cpu_time() is not optimized for Windows yet
4308 jlong os::current_thread_cpu_time() {
4309 // return user + sys since the cost is the same
4310 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4311 }
4312
4313 jlong os::thread_cpu_time(Thread* thread) {
4314 // consistent with what current_thread_cpu_time() returns.
4315 return os::thread_cpu_time(thread, true /* user+sys */);
4316 }
4317
4318 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4319 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4320 }
4321
4322 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4323 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4324 // If this function changes, os::is_thread_cpu_time_supported() should too
4325 if (os::win32::is_nt()) {
4326 FILETIME CreationTime;
4327 FILETIME ExitTime;
4328 FILETIME KernelTime;
4329 FILETIME UserTime;
4330
4331 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4332 &ExitTime, &KernelTime, &UserTime) == 0) {
4333 return -1;
4334 } else if (user_sys_cpu_time) {
4335 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4336 } else {
4337 return FT2INT64(UserTime) * 100;
4338 }
4339 } else {
4340 return (jlong) timeGetTime() * 1000000;
4341 }
4342 }
4343
4344 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4345 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4346 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4347 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4348 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4349 }
4350
4351 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4352 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4353 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4354 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4355 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4356 }
4357
4358 bool os::is_thread_cpu_time_supported() {
4359 // see os::thread_cpu_time
4360 if (os::win32::is_nt()) {
4361 FILETIME CreationTime;
4362 FILETIME ExitTime;
4363 FILETIME KernelTime;
4364 FILETIME UserTime;
4365
4366 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4367 &KernelTime, &UserTime) == 0) {
4368 return false;
4369 } else {
4370 return true;
4371 }
4372 } else {
4373 return false;
4374 }
4375 }
4376
4377 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4378 // It does have primitives (PDH API) to get CPU usage and run queue length.
4379 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4380 // If we wanted to implement loadavg on Windows, we have a few options:
4381 //
4382 // a) Query CPU usage and run queue length and "fake" an answer by
4383 // returning the CPU usage if it's under 100%, and the run queue
4384 // length otherwise. It turns out that querying is pretty slow
4385 // on Windows, on the order of 200 microseconds on a fast machine.
4386 // Note that on the Windows the CPU usage value is the % usage
4387 // since the last time the API was called (and the first call
4388 // returns 100%), so we'd have to deal with that as well.
4389 //
4390 // b) Sample the "fake" answer using a sampling thread and store
4391 // the answer in a global variable. The call to loadavg would
4392 // just return the value of the global, avoiding the slow query.
4393 //
4394 // c) Sample a better answer using exponential decay to smooth the
4395 // value. This is basically the algorithm used by UNIX kernels.
4396 //
4397 // Note that sampling thread starvation could affect both (b) and (c).
4398 int os::loadavg(double loadavg[], int nelem) {
4399 return -1;
4400 }
4401
4402
4403 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4404 bool os::dont_yield() {
4405 return DontYieldALot;
4406 }
4407
4408 // This method is a slightly reworked copy of JDK's sysOpen
4409 // from src/windows/hpi/src/sys_api_md.c
4410
4411 int os::open(const char *path, int oflag, int mode) {
4412 char pathbuf[MAX_PATH];
4413
4414 if (strlen(path) > MAX_PATH - 1) {
4415 errno = ENAMETOOLONG;
4416 return -1;
4417 }
4418 os::native_path(strcpy(pathbuf, path));
4419 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4420 }
4421
4422 FILE* os::open(int fd, const char* mode) {
4423 return ::_fdopen(fd, mode);
4424 }
4425
4426 // Is a (classpath) directory empty?
4427 bool os::dir_is_empty(const char* path) {
4428 WIN32_FIND_DATA fd;
4429 HANDLE f = FindFirstFile(path, &fd);
4430 if (f == INVALID_HANDLE_VALUE) {
4431 return true;
4432 }
4433 FindClose(f);
4434 return false;
4435 }
4436
4437 // create binary file, rewriting existing file if required
4438 int os::create_binary_file(const char* path, bool rewrite_existing) {
4439 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4440 if (!rewrite_existing) {
4441 oflags |= _O_EXCL;
4442 }
4443 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4444 }
4445
4446 // return current position of file pointer
4447 jlong os::current_file_offset(int fd) {
4448 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4449 }
4450
4451 // move file pointer to the specified offset
4452 jlong os::seek_to_file_offset(int fd, jlong offset) {
4453 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4454 }
4455
4456
4457 jlong os::lseek(int fd, jlong offset, int whence) {
4458 return (jlong) ::_lseeki64(fd, offset, whence);
4459 }
4460
4461 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4462 OVERLAPPED ov;
4463 DWORD nread;
4464 BOOL result;
4465
4466 ZeroMemory(&ov, sizeof(ov));
4467 ov.Offset = (DWORD)offset;
4468 ov.OffsetHigh = (DWORD)(offset >> 32);
4469
4470 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4471
4472 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4473
4474 return result ? nread : 0;
4475 }
4476
4477
4478 // This method is a slightly reworked copy of JDK's sysNativePath
4479 // from src/windows/hpi/src/path_md.c
4480
4481 // Convert a pathname to native format. On win32, this involves forcing all
4482 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4483 // sometimes rejects '/') and removing redundant separators. The input path is
4484 // assumed to have been converted into the character encoding used by the local
4485 // system. Because this might be a double-byte encoding, care is taken to
4486 // treat double-byte lead characters correctly.
4487 //
4488 // This procedure modifies the given path in place, as the result is never
4489 // longer than the original. There is no error return; this operation always
4490 // succeeds.
4491 char * os::native_path(char *path) {
4492 char *src = path, *dst = path, *end = path;
4493 char *colon = NULL; // If a drive specifier is found, this will
4494 // point to the colon following the drive letter
4495
4496 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4497 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4498 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4499
4500 // Check for leading separators
4501 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4502 while (isfilesep(*src)) {
4503 src++;
4504 }
4505
4506 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4507 // Remove leading separators if followed by drive specifier. This
4508 // hack is necessary to support file URLs containing drive
4509 // specifiers (e.g., "file://c:/path"). As a side effect,
4510 // "/c:/path" can be used as an alternative to "c:/path".
4511 *dst++ = *src++;
4512 colon = dst;
4513 *dst++ = ':';
4514 src++;
4515 } else {
4516 src = path;
4517 if (isfilesep(src[0]) && isfilesep(src[1])) {
4518 // UNC pathname: Retain first separator; leave src pointed at
4519 // second separator so that further separators will be collapsed
4520 // into the second separator. The result will be a pathname
4521 // beginning with "\\\\" followed (most likely) by a host name.
4522 src = dst = path + 1;
4523 path[0] = '\\'; // Force first separator to '\\'
4524 }
4525 }
4526
4527 end = dst;
4528
4529 // Remove redundant separators from remainder of path, forcing all
4530 // separators to be '\\' rather than '/'. Also, single byte space
4531 // characters are removed from the end of the path because those
4532 // are not legal ending characters on this operating system.
4533 //
4534 while (*src != '\0') {
4535 if (isfilesep(*src)) {
4536 *dst++ = '\\'; src++;
4537 while (isfilesep(*src)) src++;
4538 if (*src == '\0') {
4539 // Check for trailing separator
4540 end = dst;
4541 if (colon == dst - 2) break; // "z:\\"
4542 if (dst == path + 1) break; // "\\"
4543 if (dst == path + 2 && isfilesep(path[0])) {
4544 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4545 // beginning of a UNC pathname. Even though it is not, by
4546 // itself, a valid UNC pathname, we leave it as is in order
4547 // to be consistent with the path canonicalizer as well
4548 // as the win32 APIs, which treat this case as an invalid
4549 // UNC pathname rather than as an alias for the root
4550 // directory of the current drive.
4551 break;
4552 }
4553 end = --dst; // Path does not denote a root directory, so
4554 // remove trailing separator
4555 break;
4556 }
4557 end = dst;
4558 } else {
4559 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4560 *dst++ = *src++;
4561 if (*src) *dst++ = *src++;
4562 end = dst;
4563 } else { // Copy a single-byte character
4564 char c = *src++;
4565 *dst++ = c;
4566 // Space is not a legal ending character
4567 if (c != ' ') end = dst;
4568 }
4569 }
4570 }
4571
4572 *end = '\0';
4573
4574 // For "z:", add "." to work around a bug in the C runtime library
4575 if (colon == dst - 1) {
4576 path[2] = '.';
4577 path[3] = '\0';
4578 }
4579
4580 return path;
4581 }
4582
4583 // This code is a copy of JDK's sysSetLength
4584 // from src/windows/hpi/src/sys_api_md.c
4585
4586 int os::ftruncate(int fd, jlong length) {
4587 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4588 long high = (long)(length >> 32);
4589 DWORD ret;
4590
4591 if (h == (HANDLE)(-1)) {
4592 return -1;
4593 }
4594
4595 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4596 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4597 return -1;
4598 }
4599
4600 if (::SetEndOfFile(h) == FALSE) {
4601 return -1;
4602 }
4603
4604 return 0;
4605 }
4606
4607
4608 // This code is a copy of JDK's sysSync
4609 // from src/windows/hpi/src/sys_api_md.c
4610 // except for the legacy workaround for a bug in Win 98
4611
4612 int os::fsync(int fd) {
4613 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4614
4615 if ((!::FlushFileBuffers(handle)) &&
4616 (GetLastError() != ERROR_ACCESS_DENIED)) {
4617 // from winerror.h
4618 return -1;
4619 }
4620 return 0;
4621 }
4622
4623 static int nonSeekAvailable(int, long *);
4624 static int stdinAvailable(int, long *);
4625
4626 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4627 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4628
4629 // This code is a copy of JDK's sysAvailable
4630 // from src/windows/hpi/src/sys_api_md.c
4631
4632 int os::available(int fd, jlong *bytes) {
4633 jlong cur, end;
4634 struct _stati64 stbuf64;
4635
4636 if (::_fstati64(fd, &stbuf64) >= 0) {
4637 int mode = stbuf64.st_mode;
4638 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4639 int ret;
4640 long lpbytes;
4641 if (fd == 0) {
4642 ret = stdinAvailable(fd, &lpbytes);
4643 } else {
4644 ret = nonSeekAvailable(fd, &lpbytes);
4645 }
4646 (*bytes) = (jlong)(lpbytes);
4647 return ret;
4648 }
4649 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4650 return FALSE;
4651 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4652 return FALSE;
4653 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4654 return FALSE;
4655 }
4656 *bytes = end - cur;
4657 return TRUE;
4658 } else {
4659 return FALSE;
4660 }
4661 }
4662
4663 // This code is a copy of JDK's nonSeekAvailable
4664 // from src/windows/hpi/src/sys_api_md.c
4665
4666 static int nonSeekAvailable(int fd, long *pbytes) {
4667 // This is used for available on non-seekable devices
4668 // (like both named and anonymous pipes, such as pipes
4669 // connected to an exec'd process).
4670 // Standard Input is a special case.
4671 HANDLE han;
4672
4673 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4674 return FALSE;
4675 }
4676
4677 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4678 // PeekNamedPipe fails when at EOF. In that case we
4679 // simply make *pbytes = 0 which is consistent with the
4680 // behavior we get on Solaris when an fd is at EOF.
4681 // The only alternative is to raise an Exception,
4682 // which isn't really warranted.
4683 //
4684 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4685 return FALSE;
4686 }
4687 *pbytes = 0;
4688 }
4689 return TRUE;
4690 }
4691
4692 #define MAX_INPUT_EVENTS 2000
4693
4694 // This code is a copy of JDK's stdinAvailable
4695 // from src/windows/hpi/src/sys_api_md.c
4696
4697 static int stdinAvailable(int fd, long *pbytes) {
4698 HANDLE han;
4699 DWORD numEventsRead = 0; // Number of events read from buffer
4700 DWORD numEvents = 0; // Number of events in buffer
4701 DWORD i = 0; // Loop index
4702 DWORD curLength = 0; // Position marker
4703 DWORD actualLength = 0; // Number of bytes readable
4704 BOOL error = FALSE; // Error holder
4705 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4706
4707 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4708 return FALSE;
4709 }
4710
4711 // Construct an array of input records in the console buffer
4712 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4713 if (error == 0) {
4714 return nonSeekAvailable(fd, pbytes);
4715 }
4716
4717 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4718 if (numEvents > MAX_INPUT_EVENTS) {
4719 numEvents = MAX_INPUT_EVENTS;
4720 }
4721
4722 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4723 if (lpBuffer == NULL) {
4724 return FALSE;
4725 }
4726
4727 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4728 if (error == 0) {
4729 os::free(lpBuffer);
4730 return FALSE;
4731 }
4732
4733 // Examine input records for the number of bytes available
4734 for (i=0; i<numEvents; i++) {
4735 if (lpBuffer[i].EventType == KEY_EVENT) {
4736
4737 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4738 &(lpBuffer[i].Event);
4739 if (keyRecord->bKeyDown == TRUE) {
4740 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4741 curLength++;
4742 if (*keyPressed == '\r') {
4743 actualLength = curLength;
4744 }
4745 }
4746 }
4747 }
4748
4749 if (lpBuffer != NULL) {
4750 os::free(lpBuffer);
4751 }
4752
4753 *pbytes = (long) actualLength;
4754 return TRUE;
4755 }
4756
4757 // Map a block of memory.
4758 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4759 char *addr, size_t bytes, bool read_only,
4760 bool allow_exec) {
4761 HANDLE hFile;
4762 char* base;
4763
4764 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4765 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4766 if (hFile == NULL) {
4767 if (PrintMiscellaneous && Verbose) {
4768 DWORD err = GetLastError();
4769 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4770 }
4771 return NULL;
4772 }
4773
4774 if (allow_exec) {
4775 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4776 // unless it comes from a PE image (which the shared archive is not.)
4777 // Even VirtualProtect refuses to give execute access to mapped memory
4778 // that was not previously executable.
4779 //
4780 // Instead, stick the executable region in anonymous memory. Yuck.
4781 // Penalty is that ~4 pages will not be shareable - in the future
4782 // we might consider DLLizing the shared archive with a proper PE
4783 // header so that mapping executable + sharing is possible.
4784
4785 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4786 PAGE_READWRITE);
4787 if (base == NULL) {
4788 if (PrintMiscellaneous && Verbose) {
4789 DWORD err = GetLastError();
4790 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4791 }
4792 CloseHandle(hFile);
4793 return NULL;
4794 }
4795
4796 DWORD bytes_read;
4797 OVERLAPPED overlapped;
4798 overlapped.Offset = (DWORD)file_offset;
4799 overlapped.OffsetHigh = 0;
4800 overlapped.hEvent = NULL;
4801 // ReadFile guarantees that if the return value is true, the requested
4802 // number of bytes were read before returning.
4803 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4804 if (!res) {
4805 if (PrintMiscellaneous && Verbose) {
4806 DWORD err = GetLastError();
4807 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4808 }
4809 release_memory(base, bytes);
4810 CloseHandle(hFile);
4811 return NULL;
4812 }
4813 } else {
4814 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4815 NULL /* file_name */);
4816 if (hMap == NULL) {
4817 if (PrintMiscellaneous && Verbose) {
4818 DWORD err = GetLastError();
4819 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4820 }
4821 CloseHandle(hFile);
4822 return NULL;
4823 }
4824
4825 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4826 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4827 (DWORD)bytes, addr);
4828 if (base == NULL) {
4829 if (PrintMiscellaneous && Verbose) {
4830 DWORD err = GetLastError();
4831 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4832 }
4833 CloseHandle(hMap);
4834 CloseHandle(hFile);
4835 return NULL;
4836 }
4837
4838 if (CloseHandle(hMap) == 0) {
4839 if (PrintMiscellaneous && Verbose) {
4840 DWORD err = GetLastError();
4841 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4842 }
4843 CloseHandle(hFile);
4844 return base;
4845 }
4846 }
4847
4848 if (allow_exec) {
4849 DWORD old_protect;
4850 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4851 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4852
4853 if (!res) {
4854 if (PrintMiscellaneous && Verbose) {
4855 DWORD err = GetLastError();
4856 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4857 }
4858 // Don't consider this a hard error, on IA32 even if the
4859 // VirtualProtect fails, we should still be able to execute
4860 CloseHandle(hFile);
4861 return base;
4862 }
4863 }
4864
4865 if (CloseHandle(hFile) == 0) {
4866 if (PrintMiscellaneous && Verbose) {
4867 DWORD err = GetLastError();
4868 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4869 }
4870 return base;
4871 }
4872
4873 return base;
4874 }
4875
4876
4877 // Remap a block of memory.
4878 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4879 char *addr, size_t bytes, bool read_only,
4880 bool allow_exec) {
4881 // This OS does not allow existing memory maps to be remapped so we
4882 // have to unmap the memory before we remap it.
4883 if (!os::unmap_memory(addr, bytes)) {
4884 return NULL;
4885 }
4886
4887 // There is a very small theoretical window between the unmap_memory()
4888 // call above and the map_memory() call below where a thread in native
4889 // code may be able to access an address that is no longer mapped.
4890
4891 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4892 read_only, allow_exec);
4893 }
4894
4895
4896 // Unmap a block of memory.
4897 // Returns true=success, otherwise false.
4898
4899 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4900 MEMORY_BASIC_INFORMATION mem_info;
4901 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4902 if (PrintMiscellaneous && Verbose) {
4903 DWORD err = GetLastError();
4904 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4905 }
4906 return false;
4907 }
4908
4909 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4910 // Instead, executable region was allocated using VirtualAlloc(). See
4911 // pd_map_memory() above.
4912 //
4913 // The following flags should match the 'exec_access' flages used for
4914 // VirtualProtect() in pd_map_memory().
4915 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4916 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4917 return pd_release_memory(addr, bytes);
4918 }
4919
4920 BOOL result = UnmapViewOfFile(addr);
4921 if (result == 0) {
4922 if (PrintMiscellaneous && Verbose) {
4923 DWORD err = GetLastError();
4924 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4925 }
4926 return false;
4927 }
4928 return true;
4929 }
4930
4931 void os::pause() {
4932 char filename[MAX_PATH];
4933 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4934 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4935 } else {
4936 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4937 }
4938
4939 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4940 if (fd != -1) {
4941 struct stat buf;
4942 ::close(fd);
4943 while (::stat(filename, &buf) == 0) {
4944 Sleep(100);
4945 }
4946 } else {
4947 jio_fprintf(stderr,
4948 "Could not open pause file '%s', continuing immediately.\n", filename);
4949 }
4950 }
4951
4952 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4953 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4954 }
4955
4956 // See the caveats for this class in os_windows.hpp
4957 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4958 // into this method and returns false. If no OS EXCEPTION was raised, returns
4959 // true.
4960 // The callback is supposed to provide the method that should be protected.
4961 //
4962 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4963 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4964 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4965 "crash_protection already set?");
4966
4967 bool success = true;
4968 __try {
4969 WatcherThread::watcher_thread()->set_crash_protection(this);
4970 cb.call();
4971 } __except(EXCEPTION_EXECUTE_HANDLER) {
4972 // only for protection, nothing to do
4973 success = false;
4974 }
4975 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4976 return success;
4977 }
4978
4979 // An Event wraps a win32 "CreateEvent" kernel handle.
4980 //
4981 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4982 //
4983 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4984 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4985 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4986 // In addition, an unpark() operation might fetch the handle field, but the
4987 // event could recycle between the fetch and the SetEvent() operation.
4988 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4989 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4990 // on an stale but recycled handle would be harmless, but in practice this might
4991 // confuse other non-Sun code, so it's not a viable approach.
4992 //
4993 // 2: Once a win32 event handle is associated with an Event, it remains associated
4994 // with the Event. The event handle is never closed. This could be construed
4995 // as handle leakage, but only up to the maximum # of threads that have been extant
4996 // at any one time. This shouldn't be an issue, as windows platforms typically
4997 // permit a process to have hundreds of thousands of open handles.
4998 //
4999 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5000 // and release unused handles.
5001 //
5002 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5003 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5004 //
5005 // 5. Use an RCU-like mechanism (Read-Copy Update).
5006 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5007 //
5008 // We use (2).
5009 //
5010 // TODO-FIXME:
5011 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5012 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5013 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5014 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5015 // into a single win32 CreateEvent() handle.
5016 //
5017 // Assumption:
5018 // Only one parker can exist on an event, which is why we allocate
5019 // them per-thread. Multiple unparkers can coexist.
5020 //
5021 // _Event transitions in park()
5022 // -1 => -1 : illegal
5023 // 1 => 0 : pass - return immediately
5024 // 0 => -1 : block; then set _Event to 0 before returning
5025 //
5026 // _Event transitions in unpark()
5027 // 0 => 1 : just return
5028 // 1 => 1 : just return
5029 // -1 => either 0 or 1; must signal target thread
5030 // That is, we can safely transition _Event from -1 to either
5031 // 0 or 1.
5032 //
5033 // _Event serves as a restricted-range semaphore.
5034 // -1 : thread is blocked, i.e. there is a waiter
5035 // 0 : neutral: thread is running or ready,
5036 // could have been signaled after a wait started
5037 // 1 : signaled - thread is running or ready
5038 //
5039 // Another possible encoding of _Event would be with
5040 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5041 //
5042
5043 int os::PlatformEvent::park(jlong Millis) {
5044 // Transitions for _Event:
5045 // -1 => -1 : illegal
5046 // 1 => 0 : pass - return immediately
5047 // 0 => -1 : block; then set _Event to 0 before returning
5048
5049 guarantee(_ParkHandle != NULL , "Invariant");
5050 guarantee(Millis > 0 , "Invariant");
5051
5052 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5053 // the initial park() operation.
5054 // Consider: use atomic decrement instead of CAS-loop
5055
5056 int v;
5057 for (;;) {
5058 v = _Event;
5059 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5060 }
5061 guarantee((v == 0) || (v == 1), "invariant");
5062 if (v != 0) return OS_OK;
5063
5064 // Do this the hard way by blocking ...
5065 // TODO: consider a brief spin here, gated on the success of recent
5066 // spin attempts by this thread.
5067 //
5068 // We decompose long timeouts into series of shorter timed waits.
5069 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5070 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5071 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5072 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5073 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5074 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5075 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5076 // for the already waited time. This policy does not admit any new outcomes.
5077 // In the future, however, we might want to track the accumulated wait time and
5078 // adjust Millis accordingly if we encounter a spurious wakeup.
5079
5080 const int MAXTIMEOUT = 0x10000000;
5081 DWORD rv = WAIT_TIMEOUT;
5082 while (_Event < 0 && Millis > 0) {
5083 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5084 if (Millis > MAXTIMEOUT) {
5085 prd = MAXTIMEOUT;
5086 }
5087 rv = ::WaitForSingleObject(_ParkHandle, prd);
5088 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5089 if (rv == WAIT_TIMEOUT) {
5090 Millis -= prd;
5091 }
5092 }
5093 v = _Event;
5094 _Event = 0;
5095 // see comment at end of os::PlatformEvent::park() below:
5096 OrderAccess::fence();
5097 // If we encounter a nearly simultanous timeout expiry and unpark()
5098 // we return OS_OK indicating we awoke via unpark().
5099 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5100 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5101 }
5102
5103 void os::PlatformEvent::park() {
5104 // Transitions for _Event:
5105 // -1 => -1 : illegal
5106 // 1 => 0 : pass - return immediately
5107 // 0 => -1 : block; then set _Event to 0 before returning
5108
5109 guarantee(_ParkHandle != NULL, "Invariant");
5110 // Invariant: Only the thread associated with the Event/PlatformEvent
5111 // may call park().
5112 // Consider: use atomic decrement instead of CAS-loop
5113 int v;
5114 for (;;) {
5115 v = _Event;
5116 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5117 }
5118 guarantee((v == 0) || (v == 1), "invariant");
5119 if (v != 0) return;
5120
5121 // Do this the hard way by blocking ...
5122 // TODO: consider a brief spin here, gated on the success of recent
5123 // spin attempts by this thread.
5124 while (_Event < 0) {
5125 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5126 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5127 }
5128
5129 // Usually we'll find _Event == 0 at this point, but as
5130 // an optional optimization we clear it, just in case can
5131 // multiple unpark() operations drove _Event up to 1.
5132 _Event = 0;
5133 OrderAccess::fence();
5134 guarantee(_Event >= 0, "invariant");
5135 }
5136
5137 void os::PlatformEvent::unpark() {
5138 guarantee(_ParkHandle != NULL, "Invariant");
5139
5140 // Transitions for _Event:
5141 // 0 => 1 : just return
5142 // 1 => 1 : just return
5143 // -1 => either 0 or 1; must signal target thread
5144 // That is, we can safely transition _Event from -1 to either
5145 // 0 or 1.
5146 // See also: "Semaphores in Plan 9" by Mullender & Cox
5147 //
5148 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5149 // that it will take two back-to-back park() calls for the owning
5150 // thread to block. This has the benefit of forcing a spurious return
5151 // from the first park() call after an unpark() call which will help
5152 // shake out uses of park() and unpark() without condition variables.
5153
5154 if (Atomic::xchg(1, &_Event) >= 0) return;
5155
5156 ::SetEvent(_ParkHandle);
5157 }
5158
5159
5160 // JSR166
5161 // -------------------------------------------------------
5162
5163 // The Windows implementation of Park is very straightforward: Basic
5164 // operations on Win32 Events turn out to have the right semantics to
5165 // use them directly. We opportunistically resuse the event inherited
5166 // from Monitor.
5167
5168 void Parker::park(bool isAbsolute, jlong time) {
5169 guarantee(_ParkEvent != NULL, "invariant");
5170 // First, demultiplex/decode time arguments
5171 if (time < 0) { // don't wait
5172 return;
5173 } else if (time == 0 && !isAbsolute) {
5174 time = INFINITE;
5175 } else if (isAbsolute) {
5176 time -= os::javaTimeMillis(); // convert to relative time
5177 if (time <= 0) { // already elapsed
5178 return;
5179 }
5180 } else { // relative
5181 time /= 1000000; // Must coarsen from nanos to millis
5182 if (time == 0) { // Wait for the minimal time unit if zero
5183 time = 1;
5184 }
5185 }
5186
5187 JavaThread* thread = (JavaThread*)(Thread::current());
5188 assert(thread->is_Java_thread(), "Must be JavaThread");
5189 JavaThread *jt = (JavaThread *)thread;
5190
5191 // Don't wait if interrupted or already triggered
5192 if (Thread::is_interrupted(thread, false) ||
5193 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5194 ResetEvent(_ParkEvent);
5195 return;
5196 } else {
5197 ThreadBlockInVM tbivm(jt);
5198 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5199 jt->set_suspend_equivalent();
5200
5201 WaitForSingleObject(_ParkEvent, time);
5202 ResetEvent(_ParkEvent);
5203
5204 // If externally suspended while waiting, re-suspend
5205 if (jt->handle_special_suspend_equivalent_condition()) {
5206 jt->java_suspend_self();
5207 }
5208 }
5209 }
5210
5211 void Parker::unpark() {
5212 guarantee(_ParkEvent != NULL, "invariant");
5213 SetEvent(_ParkEvent);
5214 }
5215
5216 // Run the specified command in a separate process. Return its exit value,
5217 // or -1 on failure (e.g. can't create a new process).
5218 int os::fork_and_exec(char* cmd) {
5219 STARTUPINFO si;
5220 PROCESS_INFORMATION pi;
5221
5222 memset(&si, 0, sizeof(si));
5223 si.cb = sizeof(si);
5224 memset(&pi, 0, sizeof(pi));
5225 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5226 cmd, // command line
5227 NULL, // process security attribute
5228 NULL, // thread security attribute
5229 TRUE, // inherits system handles
5230 0, // no creation flags
5231 NULL, // use parent's environment block
5232 NULL, // use parent's starting directory
5233 &si, // (in) startup information
5234 &pi); // (out) process information
5235
5236 if (rslt) {
5237 // Wait until child process exits.
5238 WaitForSingleObject(pi.hProcess, INFINITE);
5239
5240 DWORD exit_code;
5241 GetExitCodeProcess(pi.hProcess, &exit_code);
5242
5243 // Close process and thread handles.
5244 CloseHandle(pi.hProcess);
5245 CloseHandle(pi.hThread);
5246
5247 return (int)exit_code;
5248 } else {
5249 return -1;
5250 }
5251 }
5252
5253 //--------------------------------------------------------------------------------------------------
5254 // Non-product code
5255
5256 static int mallocDebugIntervalCounter = 0;
5257 static int mallocDebugCounter = 0;
5258 bool os::check_heap(bool force) {
5259 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5260 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5261 // Note: HeapValidate executes two hardware breakpoints when it finds something
5262 // wrong; at these points, eax contains the address of the offending block (I think).
5263 // To get to the exlicit error message(s) below, just continue twice.
5264 HANDLE heap = GetProcessHeap();
5265
5266 // If we fail to lock the heap, then gflags.exe has been used
5267 // or some other special heap flag has been set that prevents
5268 // locking. We don't try to walk a heap we can't lock.
5269 if (HeapLock(heap) != 0) {
5270 PROCESS_HEAP_ENTRY phe;
5271 phe.lpData = NULL;
5272 while (HeapWalk(heap, &phe) != 0) {
5273 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5274 !HeapValidate(heap, 0, phe.lpData)) {
5275 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5276 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5277 fatal("corrupted C heap");
5278 }
5279 }
5280 DWORD err = GetLastError();
5281 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5282 fatal("heap walk aborted with error %d", err);
5283 }
5284 HeapUnlock(heap);
5285 }
5286 mallocDebugIntervalCounter = 0;
5287 }
5288 return true;
5289 }
5290
5291
5292 bool os::find(address addr, outputStream* st) {
5293 // Nothing yet
5294 return false;
5295 }
5296
5297 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5298 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5299
5300 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5301 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5302 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5303 address addr = (address) exceptionRecord->ExceptionInformation[1];
5304
5305 if (os::is_memory_serialize_page(thread, addr)) {
5306 return EXCEPTION_CONTINUE_EXECUTION;
5307 }
5308 }
5309
5310 return EXCEPTION_CONTINUE_SEARCH;
5311 }
5312
5313 // We don't build a headless jre for Windows
5314 bool os::is_headless_jre() { return false; }
5315
5316 static jint initSock() {
5317 WSADATA wsadata;
5318
5319 if (!os::WinSock2Dll::WinSock2Available()) {
5320 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5321 ::GetLastError());
5322 return JNI_ERR;
5323 }
5324
5325 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5326 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5327 ::GetLastError());
5328 return JNI_ERR;
5329 }
5330 return JNI_OK;
5331 }
5332
5333 struct hostent* os::get_host_by_name(char* name) {
5334 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5335 }
5336
5337 int os::socket_close(int fd) {
5338 return ::closesocket(fd);
5339 }
5340
5341 int os::socket(int domain, int type, int protocol) {
5342 return ::socket(domain, type, protocol);
5343 }
5344
5345 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5346 return ::connect(fd, him, len);
5347 }
5348
5349 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5350 return ::recv(fd, buf, (int)nBytes, flags);
5351 }
5352
5353 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5354 return ::send(fd, buf, (int)nBytes, flags);
5355 }
5356
5357 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5358 return ::send(fd, buf, (int)nBytes, flags);
5359 }
5360
5361 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5362 #if defined(IA32)
5363 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5364 #elif defined (AMD64)
5365 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5366 #endif
5367
5368 // returns true if thread could be suspended,
5369 // false otherwise
5370 static bool do_suspend(HANDLE* h) {
5371 if (h != NULL) {
5372 if (SuspendThread(*h) != ~0) {
5373 return true;
5374 }
5375 }
5376 return false;
5377 }
5378
5379 // resume the thread
5380 // calling resume on an active thread is a no-op
5381 static void do_resume(HANDLE* h) {
5382 if (h != NULL) {
5383 ResumeThread(*h);
5384 }
5385 }
5386
5387 // retrieve a suspend/resume context capable handle
5388 // from the tid. Caller validates handle return value.
5389 void get_thread_handle_for_extended_context(HANDLE* h,
5390 OSThread::thread_id_t tid) {
5391 if (h != NULL) {
5392 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5393 }
5394 }
5395
5396 // Thread sampling implementation
5397 //
5398 void os::SuspendedThreadTask::internal_do_task() {
5399 CONTEXT ctxt;
5400 HANDLE h = NULL;
5401
5402 // get context capable handle for thread
5403 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5404
5405 // sanity
5406 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5407 return;
5408 }
5409
5410 // suspend the thread
5411 if (do_suspend(&h)) {
5412 ctxt.ContextFlags = sampling_context_flags;
5413 // get thread context
5414 GetThreadContext(h, &ctxt);
5415 SuspendedThreadTaskContext context(_thread, &ctxt);
5416 // pass context to Thread Sampling impl
5417 do_task(context);
5418 // resume thread
5419 do_resume(&h);
5420 }
5421
5422 // close handle
5423 CloseHandle(h);
5424 }
5425
5426
5427 // Kernel32 API
5428 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5429 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5430 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5431 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5432 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5433
5434 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5435 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5436 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5437 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5438 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5439
5440
5441 BOOL os::Kernel32Dll::initialized = FALSE;
5442 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5443 assert(initialized && _GetLargePageMinimum != NULL,
5444 "GetLargePageMinimumAvailable() not yet called");
5445 return _GetLargePageMinimum();
5446 }
5447
5448 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5449 if (!initialized) {
5450 initialize();
5451 }
5452 return _GetLargePageMinimum != NULL;
5453 }
5454
5455 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5456 if (!initialized) {
5457 initialize();
5458 }
5459 return _VirtualAllocExNuma != NULL;
5460 }
5461
5462 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5463 SIZE_T bytes, DWORD flags,
5464 DWORD prot, DWORD node) {
5465 assert(initialized && _VirtualAllocExNuma != NULL,
5466 "NUMACallsAvailable() not yet called");
5467
5468 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5469 }
5470
5471 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5472 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5473 "NUMACallsAvailable() not yet called");
5474
5475 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5476 }
5477
5478 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5479 PULONGLONG proc_mask) {
5480 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5481 "NUMACallsAvailable() not yet called");
5482
5483 return _GetNumaNodeProcessorMask(node, proc_mask);
5484 }
5485
5486 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5487 ULONG FrameToCapture,
5488 PVOID* BackTrace,
5489 PULONG BackTraceHash) {
5490 if (!initialized) {
5491 initialize();
5492 }
5493
5494 if (_RtlCaptureStackBackTrace != NULL) {
5495 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5496 BackTrace, BackTraceHash);
5497 } else {
5498 return 0;
5499 }
5500 }
5501
5502 void os::Kernel32Dll::initializeCommon() {
5503 if (!initialized) {
5504 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5505 assert(handle != NULL, "Just check");
5506 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5507 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5508 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5509 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5510 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5511 initialized = TRUE;
5512 }
5513 }
5514
5515
5516
5517 #ifndef JDK6_OR_EARLIER
5518
5519 void os::Kernel32Dll::initialize() {
5520 initializeCommon();
5521 }
5522
5523
5524 // Kernel32 API
5525 inline BOOL os::Kernel32Dll::SwitchToThread() {
5526 return ::SwitchToThread();
5527 }
5528
5529 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5530 return true;
5531 }
5532
5533 // Help tools
5534 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5535 return true;
5536 }
5537
5538 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5539 DWORD th32ProcessId) {
5540 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5541 }
5542
5543 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5544 LPMODULEENTRY32 lpme) {
5545 return ::Module32First(hSnapshot, lpme);
5546 }
5547
5548 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5549 LPMODULEENTRY32 lpme) {
5550 return ::Module32Next(hSnapshot, lpme);
5551 }
5552
5553 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5554 ::GetNativeSystemInfo(lpSystemInfo);
5555 }
5556
5557 // PSAPI API
5558 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5559 HMODULE *lpModule, DWORD cb,
5560 LPDWORD lpcbNeeded) {
5561 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5562 }
5563
5564 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5565 HMODULE hModule,
5566 LPTSTR lpFilename,
5567 DWORD nSize) {
5568 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5569 }
5570
5571 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5572 HMODULE hModule,
5573 LPMODULEINFO lpmodinfo,
5574 DWORD cb) {
5575 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5576 }
5577
5578 inline BOOL os::PSApiDll::PSApiAvailable() {
5579 return true;
5580 }
5581
5582
5583 // WinSock2 API
5584 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5585 LPWSADATA lpWSAData) {
5586 return ::WSAStartup(wVersionRequested, lpWSAData);
5587 }
5588
5589 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5590 return ::gethostbyname(name);
5591 }
5592
5593 inline BOOL os::WinSock2Dll::WinSock2Available() {
5594 return true;
5595 }
5596
5597 // Advapi API
5598 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5599 BOOL DisableAllPrivileges,
5600 PTOKEN_PRIVILEGES NewState,
5601 DWORD BufferLength,
5602 PTOKEN_PRIVILEGES PreviousState,
5603 PDWORD ReturnLength) {
5604 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5605 BufferLength, PreviousState, ReturnLength);
5606 }
5607
5608 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5609 DWORD DesiredAccess,
5610 PHANDLE TokenHandle) {
5611 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5612 }
5613
5614 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5615 LPCTSTR lpName,
5616 PLUID lpLuid) {
5617 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5618 }
5619
5620 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5621 return true;
5622 }
5623
5624 void* os::get_default_process_handle() {
5625 return (void*)GetModuleHandle(NULL);
5626 }
5627
5628 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5629 // which is used to find statically linked in agents.
5630 // Additionally for windows, takes into account __stdcall names.
5631 // Parameters:
5632 // sym_name: Symbol in library we are looking for
5633 // lib_name: Name of library to look in, NULL for shared libs.
5634 // is_absolute_path == true if lib_name is absolute path to agent
5635 // such as "C:/a/b/L.dll"
5636 // == false if only the base name of the library is passed in
5637 // such as "L"
5638 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5639 bool is_absolute_path) {
5640 char *agent_entry_name;
5641 size_t len;
5642 size_t name_len;
5643 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5644 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5645 const char *start;
5646
5647 if (lib_name != NULL) {
5648 len = name_len = strlen(lib_name);
5649 if (is_absolute_path) {
5650 // Need to strip path, prefix and suffix
5651 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5652 lib_name = ++start;
5653 } else {
5654 // Need to check for drive prefix
5655 if ((start = strchr(lib_name, ':')) != NULL) {
5656 lib_name = ++start;
5657 }
5658 }
5659 if (len <= (prefix_len + suffix_len)) {
5660 return NULL;
5661 }
5662 lib_name += prefix_len;
5663 name_len = strlen(lib_name) - suffix_len;
5664 }
5665 }
5666 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5667 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5668 if (agent_entry_name == NULL) {
5669 return NULL;
5670 }
5671 if (lib_name != NULL) {
5672 const char *p = strrchr(sym_name, '@');
5673 if (p != NULL && p != sym_name) {
5674 // sym_name == _Agent_OnLoad@XX
5675 strncpy(agent_entry_name, sym_name, (p - sym_name));
5676 agent_entry_name[(p-sym_name)] = '\0';
5677 // agent_entry_name == _Agent_OnLoad
5678 strcat(agent_entry_name, "_");
5679 strncat(agent_entry_name, lib_name, name_len);
5680 strcat(agent_entry_name, p);
5681 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5682 } else {
5683 strcpy(agent_entry_name, sym_name);
5684 strcat(agent_entry_name, "_");
5685 strncat(agent_entry_name, lib_name, name_len);
5686 }
5687 } else {
5688 strcpy(agent_entry_name, sym_name);
5689 }
5690 return agent_entry_name;
5691 }
5692
5693 #else
5694 // Kernel32 API
5695 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5696 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5697 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5698 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5699 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5700
5701 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5702 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5703 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5704 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5705 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5706
5707 void os::Kernel32Dll::initialize() {
5708 if (!initialized) {
5709 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5710 assert(handle != NULL, "Just check");
5711
5712 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5713 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5714 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5715 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5716 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5717 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5718 initializeCommon(); // resolve the functions that always need resolving
5719
5720 initialized = TRUE;
5721 }
5722 }
5723
5724 BOOL os::Kernel32Dll::SwitchToThread() {
5725 assert(initialized && _SwitchToThread != NULL,
5726 "SwitchToThreadAvailable() not yet called");
5727 return _SwitchToThread();
5728 }
5729
5730
5731 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5732 if (!initialized) {
5733 initialize();
5734 }
5735 return _SwitchToThread != NULL;
5736 }
5737
5738 // Help tools
5739 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5740 if (!initialized) {
5741 initialize();
5742 }
5743 return _CreateToolhelp32Snapshot != NULL &&
5744 _Module32First != NULL &&
5745 _Module32Next != NULL;
5746 }
5747
5748 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5749 DWORD th32ProcessId) {
5750 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5751 "HelpToolsAvailable() not yet called");
5752
5753 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5754 }
5755
5756 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5757 assert(initialized && _Module32First != NULL,
5758 "HelpToolsAvailable() not yet called");
5759
5760 return _Module32First(hSnapshot, lpme);
5761 }
5762
5763 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5764 LPMODULEENTRY32 lpme) {
5765 assert(initialized && _Module32Next != NULL,
5766 "HelpToolsAvailable() not yet called");
5767
5768 return _Module32Next(hSnapshot, lpme);
5769 }
5770
5771
5772 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5773 if (!initialized) {
5774 initialize();
5775 }
5776 return _GetNativeSystemInfo != NULL;
5777 }
5778
5779 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5780 assert(initialized && _GetNativeSystemInfo != NULL,
5781 "GetNativeSystemInfoAvailable() not yet called");
5782
5783 _GetNativeSystemInfo(lpSystemInfo);
5784 }
5785
5786 // PSAPI API
5787
5788
5789 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5790 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5791 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5792
5793 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5794 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5795 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5796 BOOL os::PSApiDll::initialized = FALSE;
5797
5798 void os::PSApiDll::initialize() {
5799 if (!initialized) {
5800 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5801 if (handle != NULL) {
5802 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5803 "EnumProcessModules");
5804 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5805 "GetModuleFileNameExA");
5806 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5807 "GetModuleInformation");
5808 }
5809 initialized = TRUE;
5810 }
5811 }
5812
5813
5814
5815 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5816 DWORD cb, LPDWORD lpcbNeeded) {
5817 assert(initialized && _EnumProcessModules != NULL,
5818 "PSApiAvailable() not yet called");
5819 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5820 }
5821
5822 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5823 LPTSTR lpFilename, DWORD nSize) {
5824 assert(initialized && _GetModuleFileNameEx != NULL,
5825 "PSApiAvailable() not yet called");
5826 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5827 }
5828
5829 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5830 LPMODULEINFO lpmodinfo, DWORD cb) {
5831 assert(initialized && _GetModuleInformation != NULL,
5832 "PSApiAvailable() not yet called");
5833 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5834 }
5835
5836 BOOL os::PSApiDll::PSApiAvailable() {
5837 if (!initialized) {
5838 initialize();
5839 }
5840 return _EnumProcessModules != NULL &&
5841 _GetModuleFileNameEx != NULL &&
5842 _GetModuleInformation != NULL;
5843 }
5844
5845
5846 // WinSock2 API
5847 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5848 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5849
5850 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5851 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5852 BOOL os::WinSock2Dll::initialized = FALSE;
5853
5854 void os::WinSock2Dll::initialize() {
5855 if (!initialized) {
5856 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5857 if (handle != NULL) {
5858 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5859 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5860 }
5861 initialized = TRUE;
5862 }
5863 }
5864
5865
5866 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5867 assert(initialized && _WSAStartup != NULL,
5868 "WinSock2Available() not yet called");
5869 return _WSAStartup(wVersionRequested, lpWSAData);
5870 }
5871
5872 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5873 assert(initialized && _gethostbyname != NULL,
5874 "WinSock2Available() not yet called");
5875 return _gethostbyname(name);
5876 }
5877
5878 BOOL os::WinSock2Dll::WinSock2Available() {
5879 if (!initialized) {
5880 initialize();
5881 }
5882 return _WSAStartup != NULL &&
5883 _gethostbyname != NULL;
5884 }
5885
5886 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5887 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5888 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5889
5890 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5891 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5892 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5893 BOOL os::Advapi32Dll::initialized = FALSE;
5894
5895 void os::Advapi32Dll::initialize() {
5896 if (!initialized) {
5897 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5898 if (handle != NULL) {
5899 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5900 "AdjustTokenPrivileges");
5901 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5902 "OpenProcessToken");
5903 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5904 "LookupPrivilegeValueA");
5905 }
5906 initialized = TRUE;
5907 }
5908 }
5909
5910 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5911 BOOL DisableAllPrivileges,
5912 PTOKEN_PRIVILEGES NewState,
5913 DWORD BufferLength,
5914 PTOKEN_PRIVILEGES PreviousState,
5915 PDWORD ReturnLength) {
5916 assert(initialized && _AdjustTokenPrivileges != NULL,
5917 "AdvapiAvailable() not yet called");
5918 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5919 BufferLength, PreviousState, ReturnLength);
5920 }
5921
5922 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5923 DWORD DesiredAccess,
5924 PHANDLE TokenHandle) {
5925 assert(initialized && _OpenProcessToken != NULL,
5926 "AdvapiAvailable() not yet called");
5927 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5928 }
5929
5930 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5931 LPCTSTR lpName, PLUID lpLuid) {
5932 assert(initialized && _LookupPrivilegeValue != NULL,
5933 "AdvapiAvailable() not yet called");
5934 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5935 }
5936
5937 BOOL os::Advapi32Dll::AdvapiAvailable() {
5938 if (!initialized) {
5939 initialize();
5940 }
5941 return _AdjustTokenPrivileges != NULL &&
5942 _OpenProcessToken != NULL &&
5943 _LookupPrivilegeValue != NULL;
5944 }
5945
5946 #endif
5947
5948 #ifndef PRODUCT
5949
5950 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5951 // contiguous memory block at a particular address.
5952 // The test first tries to find a good approximate address to allocate at by using the same
5953 // method to allocate some memory at any address. The test then tries to allocate memory in
5954 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5955 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5956 // the previously allocated memory is available for allocation. The only actual failure
5957 // that is reported is when the test tries to allocate at a particular location but gets a
5958 // different valid one. A NULL return value at this point is not considered an error but may
5959 // be legitimate.
5960 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5961 void TestReserveMemorySpecial_test() {
5962 if (!UseLargePages) {
5963 if (VerboseInternalVMTests) {
5964 gclog_or_tty->print("Skipping test because large pages are disabled");
5965 }
5966 return;
5967 }
5968 // save current value of globals
5969 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5970 bool old_use_numa_interleaving = UseNUMAInterleaving;
5971
5972 // set globals to make sure we hit the correct code path
5973 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5974
5975 // do an allocation at an address selected by the OS to get a good one.
5976 const size_t large_allocation_size = os::large_page_size() * 4;
5977 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5978 if (result == NULL) {
5979 if (VerboseInternalVMTests) {
5980 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5981 large_allocation_size);
5982 }
5983 } else {
5984 os::release_memory_special(result, large_allocation_size);
5985
5986 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5987 // we managed to get it once.
5988 const size_t expected_allocation_size = os::large_page_size();
5989 char* expected_location = result + os::large_page_size();
5990 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5991 if (actual_location == NULL) {
5992 if (VerboseInternalVMTests) {
5993 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5994 expected_location, large_allocation_size);
5995 }
5996 } else {
5997 // release memory
5998 os::release_memory_special(actual_location, expected_allocation_size);
5999 // only now check, after releasing any memory to avoid any leaks.
6000 assert(actual_location == expected_location,
6001 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
6002 expected_location, expected_allocation_size, actual_location);
6003 }
6004 }
6005
6006 // restore globals
6007 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
6008 UseNUMAInterleaving = old_use_numa_interleaving;
6009 }
6010 #endif // PRODUCT