1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 OSThread* osthr = thread->osthread();
423 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
424
425 if (UseNUMA) {
426 int lgrp_id = os::numa_get_group_id();
427 if (lgrp_id != -1) {
428 thread->set_lgrp_id(lgrp_id);
429 }
430 }
431
432 // Diagnostic code to investigate JDK-6573254
433 int res = 30115; // non-java thread
434 if (thread->is_Java_thread()) {
435 res = 20115; // java thread
436 }
437
438 // Install a win32 structured exception handler around every thread created
439 // by VM, so VM can generate error dump when an exception occurred in non-
440 // Java thread (e.g. VM thread).
441 __try {
442 thread->run();
443 } __except(topLevelExceptionFilter(
444 (_EXCEPTION_POINTERS*)_exception_info())) {
445 // Nothing to do.
446 }
447
448 // One less thread is executing
449 // When the VMThread gets here, the main thread may have already exited
450 // which frees the CodeHeap containing the Atomic::add code
451 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
452 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
453 }
454
455 // Thread must not return from exit_process_or_thread(), but if it does,
456 // let it proceed to exit normally
457 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
458 }
459
460 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
461 int thread_id) {
462 // Allocate the OSThread object
463 OSThread* osthread = new OSThread(NULL, NULL);
464 if (osthread == NULL) return NULL;
465
466 // Initialize support for Java interrupts
467 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
468 if (interrupt_event == NULL) {
469 delete osthread;
470 return NULL;
471 }
472 osthread->set_interrupt_event(interrupt_event);
473
474 // Store info on the Win32 thread into the OSThread
475 osthread->set_thread_handle(thread_handle);
476 osthread->set_thread_id(thread_id);
477
478 if (UseNUMA) {
479 int lgrp_id = os::numa_get_group_id();
480 if (lgrp_id != -1) {
481 thread->set_lgrp_id(lgrp_id);
482 }
483 }
484
485 // Initial thread state is INITIALIZED, not SUSPENDED
486 osthread->set_state(INITIALIZED);
487
488 return osthread;
489 }
490
491
492 bool os::create_attached_thread(JavaThread* thread) {
493 #ifdef ASSERT
494 thread->verify_not_published();
495 #endif
496 HANDLE thread_h;
497 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
498 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
499 fatal("DuplicateHandle failed\n");
500 }
501 OSThread* osthread = create_os_thread(thread, thread_h,
502 (int)current_thread_id());
503 if (osthread == NULL) {
504 return false;
505 }
506
507 // Initial thread state is RUNNABLE
508 osthread->set_state(RUNNABLE);
509
510 thread->set_osthread(osthread);
511 return true;
512 }
513
514 bool os::create_main_thread(JavaThread* thread) {
515 #ifdef ASSERT
516 thread->verify_not_published();
517 #endif
518 if (_starting_thread == NULL) {
519 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
520 if (_starting_thread == NULL) {
521 return false;
522 }
523 }
524
525 // The primordial thread is runnable from the start)
526 _starting_thread->set_state(RUNNABLE);
527
528 thread->set_osthread(_starting_thread);
529 return true;
530 }
531
532 // Allocate and initialize a new OSThread
533 bool os::create_thread(Thread* thread, ThreadType thr_type,
534 size_t stack_size) {
535 unsigned thread_id;
536
537 // Allocate the OSThread object
538 OSThread* osthread = new OSThread(NULL, NULL);
539 if (osthread == NULL) {
540 return false;
541 }
542
543 // Initialize support for Java interrupts
544 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
545 if (interrupt_event == NULL) {
546 delete osthread;
547 return NULL;
548 }
549 osthread->set_interrupt_event(interrupt_event);
550 osthread->set_interrupted(false);
551
552 thread->set_osthread(osthread);
553
554 if (stack_size == 0) {
555 switch (thr_type) {
556 case os::java_thread:
557 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
558 if (JavaThread::stack_size_at_create() > 0) {
559 stack_size = JavaThread::stack_size_at_create();
560 }
561 break;
562 case os::compiler_thread:
563 if (CompilerThreadStackSize > 0) {
564 stack_size = (size_t)(CompilerThreadStackSize * K);
565 break;
566 } // else fall through:
567 // use VMThreadStackSize if CompilerThreadStackSize is not defined
568 case os::vm_thread:
569 case os::pgc_thread:
570 case os::cgc_thread:
571 case os::watcher_thread:
572 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
573 break;
574 }
575 }
576
577 // Create the Win32 thread
578 //
579 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
580 // does not specify stack size. Instead, it specifies the size of
581 // initially committed space. The stack size is determined by
582 // PE header in the executable. If the committed "stack_size" is larger
583 // than default value in the PE header, the stack is rounded up to the
584 // nearest multiple of 1MB. For example if the launcher has default
585 // stack size of 320k, specifying any size less than 320k does not
586 // affect the actual stack size at all, it only affects the initial
587 // commitment. On the other hand, specifying 'stack_size' larger than
588 // default value may cause significant increase in memory usage, because
589 // not only the stack space will be rounded up to MB, but also the
590 // entire space is committed upfront.
591 //
592 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
593 // for CreateThread() that can treat 'stack_size' as stack size. However we
594 // are not supposed to call CreateThread() directly according to MSDN
595 // document because JVM uses C runtime library. The good news is that the
596 // flag appears to work with _beginthredex() as well.
597
598 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
599 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
600 #endif
601
602 HANDLE thread_handle =
603 (HANDLE)_beginthreadex(NULL,
604 (unsigned)stack_size,
605 (unsigned (__stdcall *)(void*)) java_start,
606 thread,
607 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
608 &thread_id);
609 if (thread_handle == NULL) {
610 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
611 // without the flag.
612 thread_handle =
613 (HANDLE)_beginthreadex(NULL,
614 (unsigned)stack_size,
615 (unsigned (__stdcall *)(void*)) java_start,
616 thread,
617 CREATE_SUSPENDED,
618 &thread_id);
619 }
620 if (thread_handle == NULL) {
621 // Need to clean up stuff we've allocated so far
622 CloseHandle(osthread->interrupt_event());
623 thread->set_osthread(NULL);
624 delete osthread;
625 return NULL;
626 }
627
628 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
629
630 // Store info on the Win32 thread into the OSThread
631 osthread->set_thread_handle(thread_handle);
632 osthread->set_thread_id(thread_id);
633
634 // Initial thread state is INITIALIZED, not SUSPENDED
635 osthread->set_state(INITIALIZED);
636
637 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
638 return true;
639 }
640
641
642 // Free Win32 resources related to the OSThread
643 void os::free_thread(OSThread* osthread) {
644 assert(osthread != NULL, "osthread not set");
645 CloseHandle(osthread->thread_handle());
646 CloseHandle(osthread->interrupt_event());
647 delete osthread;
648 }
649
650 static jlong first_filetime;
651 static jlong initial_performance_count;
652 static jlong performance_frequency;
653
654
655 jlong as_long(LARGE_INTEGER x) {
656 jlong result = 0; // initialization to avoid warning
657 set_high(&result, x.HighPart);
658 set_low(&result, x.LowPart);
659 return result;
660 }
661
662
663 jlong os::elapsed_counter() {
664 LARGE_INTEGER count;
665 if (win32::_has_performance_count) {
666 QueryPerformanceCounter(&count);
667 return as_long(count) - initial_performance_count;
668 } else {
669 FILETIME wt;
670 GetSystemTimeAsFileTime(&wt);
671 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
672 }
673 }
674
675
676 jlong os::elapsed_frequency() {
677 if (win32::_has_performance_count) {
678 return performance_frequency;
679 } else {
680 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
681 return 10000000;
682 }
683 }
684
685
686 julong os::available_memory() {
687 return win32::available_memory();
688 }
689
690 julong os::win32::available_memory() {
691 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
692 // value if total memory is larger than 4GB
693 MEMORYSTATUSEX ms;
694 ms.dwLength = sizeof(ms);
695 GlobalMemoryStatusEx(&ms);
696
697 return (julong)ms.ullAvailPhys;
698 }
699
700 julong os::physical_memory() {
701 return win32::physical_memory();
702 }
703
704 bool os::has_allocatable_memory_limit(julong* limit) {
705 MEMORYSTATUSEX ms;
706 ms.dwLength = sizeof(ms);
707 GlobalMemoryStatusEx(&ms);
708 #ifdef _LP64
709 *limit = (julong)ms.ullAvailVirtual;
710 return true;
711 #else
712 // Limit to 1400m because of the 2gb address space wall
713 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
714 return true;
715 #endif
716 }
717
718 // VC6 lacks DWORD_PTR
719 #if _MSC_VER < 1300
720 typedef UINT_PTR DWORD_PTR;
721 #endif
722
723 int os::active_processor_count() {
724 DWORD_PTR lpProcessAffinityMask = 0;
725 DWORD_PTR lpSystemAffinityMask = 0;
726 int proc_count = processor_count();
727 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
728 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
729 // Nof active processors is number of bits in process affinity mask
730 int bitcount = 0;
731 while (lpProcessAffinityMask != 0) {
732 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
733 bitcount++;
734 }
735 return bitcount;
736 } else {
737 return proc_count;
738 }
739 }
740
741 void os::set_native_thread_name(const char *name) {
742
743 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
744 //
745 // Note that unfortunately this only works if the process
746 // is already attached to a debugger; debugger must observe
747 // the exception below to show the correct name.
748
749 const DWORD MS_VC_EXCEPTION = 0x406D1388;
750 struct {
751 DWORD dwType; // must be 0x1000
752 LPCSTR szName; // pointer to name (in user addr space)
753 DWORD dwThreadID; // thread ID (-1=caller thread)
754 DWORD dwFlags; // reserved for future use, must be zero
755 } info;
756
757 info.dwType = 0x1000;
758 info.szName = name;
759 info.dwThreadID = -1;
760 info.dwFlags = 0;
761
762 __try {
763 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
764 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
765 }
766
767 bool os::distribute_processes(uint length, uint* distribution) {
768 // Not yet implemented.
769 return false;
770 }
771
772 bool os::bind_to_processor(uint processor_id) {
773 // Not yet implemented.
774 return false;
775 }
776
777 void os::win32::initialize_performance_counter() {
778 LARGE_INTEGER count;
779 if (QueryPerformanceFrequency(&count)) {
780 win32::_has_performance_count = 1;
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 } else {
785 win32::_has_performance_count = 0;
786 FILETIME wt;
787 GetSystemTimeAsFileTime(&wt);
788 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
789 }
790 }
791
792
793 double os::elapsedTime() {
794 return (double) elapsed_counter() / (double) elapsed_frequency();
795 }
796
797
798 // Windows format:
799 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
800 // Java format:
801 // Java standards require the number of milliseconds since 1/1/1970
802
803 // Constant offset - calculated using offset()
804 static jlong _offset = 116444736000000000;
805 // Fake time counter for reproducible results when debugging
806 static jlong fake_time = 0;
807
808 #ifdef ASSERT
809 // Just to be safe, recalculate the offset in debug mode
810 static jlong _calculated_offset = 0;
811 static int _has_calculated_offset = 0;
812
813 jlong offset() {
814 if (_has_calculated_offset) return _calculated_offset;
815 SYSTEMTIME java_origin;
816 java_origin.wYear = 1970;
817 java_origin.wMonth = 1;
818 java_origin.wDayOfWeek = 0; // ignored
819 java_origin.wDay = 1;
820 java_origin.wHour = 0;
821 java_origin.wMinute = 0;
822 java_origin.wSecond = 0;
823 java_origin.wMilliseconds = 0;
824 FILETIME jot;
825 if (!SystemTimeToFileTime(&java_origin, &jot)) {
826 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
827 }
828 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
829 _has_calculated_offset = 1;
830 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
831 return _calculated_offset;
832 }
833 #else
834 jlong offset() {
835 return _offset;
836 }
837 #endif
838
839 jlong windows_to_java_time(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset()) / 10000;
842 }
843
844 // Returns time ticks in (10th of micro seconds)
845 jlong windows_to_time_ticks(FILETIME wt) {
846 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
847 return (a - offset());
848 }
849
850 FILETIME java_to_windows_time(jlong l) {
851 jlong a = (l * 10000) + offset();
852 FILETIME result;
853 result.dwHighDateTime = high(a);
854 result.dwLowDateTime = low(a);
855 return result;
856 }
857
858 bool os::supports_vtime() { return true; }
859 bool os::enable_vtime() { return false; }
860 bool os::vtime_enabled() { return false; }
861
862 double os::elapsedVTime() {
863 FILETIME created;
864 FILETIME exited;
865 FILETIME kernel;
866 FILETIME user;
867 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
868 // the resolution of windows_to_java_time() should be sufficient (ms)
869 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
870 } else {
871 return elapsedTime();
872 }
873 }
874
875 jlong os::javaTimeMillis() {
876 if (UseFakeTimers) {
877 return fake_time++;
878 } else {
879 FILETIME wt;
880 GetSystemTimeAsFileTime(&wt);
881 return windows_to_java_time(wt);
882 }
883 }
884
885 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
886 FILETIME wt;
887 GetSystemTimeAsFileTime(&wt);
888 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
889 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
890 seconds = secs;
891 nanos = jlong(ticks - (secs*10000000)) * 100;
892 }
893
894 jlong os::javaTimeNanos() {
895 if (!win32::_has_performance_count) {
896 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
897 } else {
898 LARGE_INTEGER current_count;
899 QueryPerformanceCounter(¤t_count);
900 double current = as_long(current_count);
901 double freq = performance_frequency;
902 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
903 return time;
904 }
905 }
906
907 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
908 if (!win32::_has_performance_count) {
909 // javaTimeMillis() doesn't have much percision,
910 // but it is not going to wrap -- so all 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912
913 // this is a wall clock timer, so may skip
914 info_ptr->may_skip_backward = true;
915 info_ptr->may_skip_forward = true;
916 } else {
917 jlong freq = performance_frequency;
918 if (freq < NANOSECS_PER_SEC) {
919 // the performance counter is 64 bits and we will
920 // be multiplying it -- so no wrap in 64 bits
921 info_ptr->max_value = ALL_64_BITS;
922 } else if (freq > NANOSECS_PER_SEC) {
923 // use the max value the counter can reach to
924 // determine the max value which could be returned
925 julong max_counter = (julong)ALL_64_BITS;
926 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
927 } else {
928 // the performance counter is 64 bits and we will
929 // be using it directly -- so no wrap in 64 bits
930 info_ptr->max_value = ALL_64_BITS;
931 }
932
933 // using a counter, so no skipping
934 info_ptr->may_skip_backward = false;
935 info_ptr->may_skip_forward = false;
936 }
937 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
938 }
939
940 char* os::local_time_string(char *buf, size_t buflen) {
941 SYSTEMTIME st;
942 GetLocalTime(&st);
943 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
944 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
945 return buf;
946 }
947
948 bool os::getTimesSecs(double* process_real_time,
949 double* process_user_time,
950 double* process_system_time) {
951 HANDLE h_process = GetCurrentProcess();
952 FILETIME create_time, exit_time, kernel_time, user_time;
953 BOOL result = GetProcessTimes(h_process,
954 &create_time,
955 &exit_time,
956 &kernel_time,
957 &user_time);
958 if (result != 0) {
959 FILETIME wt;
960 GetSystemTimeAsFileTime(&wt);
961 jlong rtc_millis = windows_to_java_time(wt);
962 jlong user_millis = windows_to_java_time(user_time);
963 jlong system_millis = windows_to_java_time(kernel_time);
964 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
965 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
966 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
967 return true;
968 } else {
969 return false;
970 }
971 }
972
973 void os::shutdown() {
974 // allow PerfMemory to attempt cleanup of any persistent resources
975 perfMemory_exit();
976
977 // flush buffered output, finish log files
978 ostream_abort();
979
980 // Check for abort hook
981 abort_hook_t abort_hook = Arguments::abort_hook();
982 if (abort_hook != NULL) {
983 abort_hook();
984 }
985 }
986
987
988 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
989 PMINIDUMP_EXCEPTION_INFORMATION,
990 PMINIDUMP_USER_STREAM_INFORMATION,
991 PMINIDUMP_CALLBACK_INFORMATION);
992
993 static HANDLE dumpFile = NULL;
994
995 // Check if dump file can be created.
996 void os::check_dump_limit(char* buffer, size_t buffsz) {
997 bool status = true;
998 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
999 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1000 status = false;
1001 }
1002
1003 #ifndef ASSERT
1004 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1005 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1006 status = false;
1007 }
1008 #endif
1009
1010 if (status) {
1011 const char* cwd = get_current_directory(NULL, 0);
1012 int pid = current_process_id();
1013 if (cwd != NULL) {
1014 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1015 } else {
1016 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1017 }
1018
1019 if (dumpFile == NULL &&
1020 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1021 == INVALID_HANDLE_VALUE) {
1022 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1023 status = false;
1024 }
1025 }
1026 VMError::record_coredump_status(buffer, status);
1027 }
1028
1029 void os::abort(bool dump_core, void* siginfo, void* context) {
1030 HINSTANCE dbghelp;
1031 EXCEPTION_POINTERS ep;
1032 MINIDUMP_EXCEPTION_INFORMATION mei;
1033 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1034
1035 HANDLE hProcess = GetCurrentProcess();
1036 DWORD processId = GetCurrentProcessId();
1037 MINIDUMP_TYPE dumpType;
1038
1039 shutdown();
1040 if (!dump_core || dumpFile == NULL) {
1041 if (dumpFile != NULL) {
1042 CloseHandle(dumpFile);
1043 }
1044 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1045 }
1046
1047 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1048
1049 if (dbghelp == NULL) {
1050 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1051 CloseHandle(dumpFile);
1052 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1053 }
1054
1055 _MiniDumpWriteDump =
1056 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1057 PMINIDUMP_EXCEPTION_INFORMATION,
1058 PMINIDUMP_USER_STREAM_INFORMATION,
1059 PMINIDUMP_CALLBACK_INFORMATION),
1060 GetProcAddress(dbghelp,
1061 "MiniDumpWriteDump"));
1062
1063 if (_MiniDumpWriteDump == NULL) {
1064 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1065 CloseHandle(dumpFile);
1066 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1067 }
1068
1069 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1070
1071 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1072 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1073 #if API_VERSION_NUMBER >= 11
1074 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1075 MiniDumpWithUnloadedModules);
1076 #endif
1077
1078 if (siginfo != NULL && context != NULL) {
1079 ep.ContextRecord = (PCONTEXT) context;
1080 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1081
1082 mei.ThreadId = GetCurrentThreadId();
1083 mei.ExceptionPointers = &ep;
1084 pmei = &mei;
1085 } else {
1086 pmei = NULL;
1087 }
1088
1089 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1090 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1091 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1092 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1093 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1094 }
1095 CloseHandle(dumpFile);
1096 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1097 }
1098
1099 // Die immediately, no exit hook, no abort hook, no cleanup.
1100 void os::die() {
1101 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1102 }
1103
1104 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1105 // * dirent_md.c 1.15 00/02/02
1106 //
1107 // The declarations for DIR and struct dirent are in jvm_win32.h.
1108
1109 // Caller must have already run dirname through JVM_NativePath, which removes
1110 // duplicate slashes and converts all instances of '/' into '\\'.
1111
1112 DIR * os::opendir(const char *dirname) {
1113 assert(dirname != NULL, "just checking"); // hotspot change
1114 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1115 DWORD fattr; // hotspot change
1116 char alt_dirname[4] = { 0, 0, 0, 0 };
1117
1118 if (dirp == 0) {
1119 errno = ENOMEM;
1120 return 0;
1121 }
1122
1123 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1124 // as a directory in FindFirstFile(). We detect this case here and
1125 // prepend the current drive name.
1126 //
1127 if (dirname[1] == '\0' && dirname[0] == '\\') {
1128 alt_dirname[0] = _getdrive() + 'A' - 1;
1129 alt_dirname[1] = ':';
1130 alt_dirname[2] = '\\';
1131 alt_dirname[3] = '\0';
1132 dirname = alt_dirname;
1133 }
1134
1135 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1136 if (dirp->path == 0) {
1137 free(dirp);
1138 errno = ENOMEM;
1139 return 0;
1140 }
1141 strcpy(dirp->path, dirname);
1142
1143 fattr = GetFileAttributes(dirp->path);
1144 if (fattr == 0xffffffff) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOENT;
1148 return 0;
1149 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1150 free(dirp->path);
1151 free(dirp);
1152 errno = ENOTDIR;
1153 return 0;
1154 }
1155
1156 // Append "*.*", or possibly "\\*.*", to path
1157 if (dirp->path[1] == ':' &&
1158 (dirp->path[2] == '\0' ||
1159 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1160 // No '\\' needed for cases like "Z:" or "Z:\"
1161 strcat(dirp->path, "*.*");
1162 } else {
1163 strcat(dirp->path, "\\*.*");
1164 }
1165
1166 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1167 if (dirp->handle == INVALID_HANDLE_VALUE) {
1168 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1169 free(dirp->path);
1170 free(dirp);
1171 errno = EACCES;
1172 return 0;
1173 }
1174 }
1175 return dirp;
1176 }
1177
1178 // parameter dbuf unused on Windows
1179 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1180 assert(dirp != NULL, "just checking"); // hotspot change
1181 if (dirp->handle == INVALID_HANDLE_VALUE) {
1182 return 0;
1183 }
1184
1185 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1186
1187 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1188 if (GetLastError() == ERROR_INVALID_HANDLE) {
1189 errno = EBADF;
1190 return 0;
1191 }
1192 FindClose(dirp->handle);
1193 dirp->handle = INVALID_HANDLE_VALUE;
1194 }
1195
1196 return &dirp->dirent;
1197 }
1198
1199 int os::closedir(DIR *dirp) {
1200 assert(dirp != NULL, "just checking"); // hotspot change
1201 if (dirp->handle != INVALID_HANDLE_VALUE) {
1202 if (!FindClose(dirp->handle)) {
1203 errno = EBADF;
1204 return -1;
1205 }
1206 dirp->handle = INVALID_HANDLE_VALUE;
1207 }
1208 free(dirp->path);
1209 free(dirp);
1210 return 0;
1211 }
1212
1213 // This must be hard coded because it's the system's temporary
1214 // directory not the java application's temp directory, ala java.io.tmpdir.
1215 const char* os::get_temp_directory() {
1216 static char path_buf[MAX_PATH];
1217 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1218 return path_buf;
1219 } else {
1220 path_buf[0] = '\0';
1221 return path_buf;
1222 }
1223 }
1224
1225 static bool file_exists(const char* filename) {
1226 if (filename == NULL || strlen(filename) == 0) {
1227 return false;
1228 }
1229 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1230 }
1231
1232 bool os::dll_build_name(char *buffer, size_t buflen,
1233 const char* pname, const char* fname) {
1234 bool retval = false;
1235 const size_t pnamelen = pname ? strlen(pname) : 0;
1236 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1237
1238 // Return error on buffer overflow.
1239 if (pnamelen + strlen(fname) + 10 > buflen) {
1240 return retval;
1241 }
1242
1243 if (pnamelen == 0) {
1244 jio_snprintf(buffer, buflen, "%s.dll", fname);
1245 retval = true;
1246 } else if (c == ':' || c == '\\') {
1247 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1248 retval = true;
1249 } else if (strchr(pname, *os::path_separator()) != NULL) {
1250 int n;
1251 char** pelements = split_path(pname, &n);
1252 if (pelements == NULL) {
1253 return false;
1254 }
1255 for (int i = 0; i < n; i++) {
1256 char* path = pelements[i];
1257 // Really shouldn't be NULL, but check can't hurt
1258 size_t plen = (path == NULL) ? 0 : strlen(path);
1259 if (plen == 0) {
1260 continue; // skip the empty path values
1261 }
1262 const char lastchar = path[plen - 1];
1263 if (lastchar == ':' || lastchar == '\\') {
1264 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1265 } else {
1266 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1267 }
1268 if (file_exists(buffer)) {
1269 retval = true;
1270 break;
1271 }
1272 }
1273 // release the storage
1274 for (int i = 0; i < n; i++) {
1275 if (pelements[i] != NULL) {
1276 FREE_C_HEAP_ARRAY(char, pelements[i]);
1277 }
1278 }
1279 if (pelements != NULL) {
1280 FREE_C_HEAP_ARRAY(char*, pelements);
1281 }
1282 } else {
1283 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1284 retval = true;
1285 }
1286 return retval;
1287 }
1288
1289 // Needs to be in os specific directory because windows requires another
1290 // header file <direct.h>
1291 const char* os::get_current_directory(char *buf, size_t buflen) {
1292 int n = static_cast<int>(buflen);
1293 if (buflen > INT_MAX) n = INT_MAX;
1294 return _getcwd(buf, n);
1295 }
1296
1297 //-----------------------------------------------------------
1298 // Helper functions for fatal error handler
1299 #ifdef _WIN64
1300 // Helper routine which returns true if address in
1301 // within the NTDLL address space.
1302 //
1303 static bool _addr_in_ntdll(address addr) {
1304 HMODULE hmod;
1305 MODULEINFO minfo;
1306
1307 hmod = GetModuleHandle("NTDLL.DLL");
1308 if (hmod == NULL) return false;
1309 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1310 &minfo, sizeof(MODULEINFO))) {
1311 return false;
1312 }
1313
1314 if ((addr >= minfo.lpBaseOfDll) &&
1315 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1316 return true;
1317 } else {
1318 return false;
1319 }
1320 }
1321 #endif
1322
1323 struct _modinfo {
1324 address addr;
1325 char* full_path; // point to a char buffer
1326 int buflen; // size of the buffer
1327 address base_addr;
1328 };
1329
1330 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1331 address top_address, void * param) {
1332 struct _modinfo *pmod = (struct _modinfo *)param;
1333 if (!pmod) return -1;
1334
1335 if (base_addr <= pmod->addr &&
1336 top_address > pmod->addr) {
1337 // if a buffer is provided, copy path name to the buffer
1338 if (pmod->full_path) {
1339 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1340 }
1341 pmod->base_addr = base_addr;
1342 return 1;
1343 }
1344 return 0;
1345 }
1346
1347 bool os::dll_address_to_library_name(address addr, char* buf,
1348 int buflen, int* offset) {
1349 // buf is not optional, but offset is optional
1350 assert(buf != NULL, "sanity check");
1351
1352 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1353 // return the full path to the DLL file, sometimes it returns path
1354 // to the corresponding PDB file (debug info); sometimes it only
1355 // returns partial path, which makes life painful.
1356
1357 struct _modinfo mi;
1358 mi.addr = addr;
1359 mi.full_path = buf;
1360 mi.buflen = buflen;
1361 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1362 // buf already contains path name
1363 if (offset) *offset = addr - mi.base_addr;
1364 return true;
1365 }
1366
1367 buf[0] = '\0';
1368 if (offset) *offset = -1;
1369 return false;
1370 }
1371
1372 bool os::dll_address_to_function_name(address addr, char *buf,
1373 int buflen, int *offset,
1374 bool demangle) {
1375 // buf is not optional, but offset is optional
1376 assert(buf != NULL, "sanity check");
1377
1378 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1379 return true;
1380 }
1381 if (offset != NULL) *offset = -1;
1382 buf[0] = '\0';
1383 return false;
1384 }
1385
1386 // save the start and end address of jvm.dll into param[0] and param[1]
1387 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1388 address top_address, void * param) {
1389 if (!param) return -1;
1390
1391 if (base_addr <= (address)_locate_jvm_dll &&
1392 top_address > (address)_locate_jvm_dll) {
1393 ((address*)param)[0] = base_addr;
1394 ((address*)param)[1] = top_address;
1395 return 1;
1396 }
1397 return 0;
1398 }
1399
1400 address vm_lib_location[2]; // start and end address of jvm.dll
1401
1402 // check if addr is inside jvm.dll
1403 bool os::address_is_in_vm(address addr) {
1404 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1405 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1406 assert(false, "Can't find jvm module.");
1407 return false;
1408 }
1409 }
1410
1411 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1412 }
1413
1414 // print module info; param is outputStream*
1415 static int _print_module(const char* fname, address base_address,
1416 address top_address, void* param) {
1417 if (!param) return -1;
1418
1419 outputStream* st = (outputStream*)param;
1420
1421 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1422 return 0;
1423 }
1424
1425 // Loads .dll/.so and
1426 // in case of error it checks if .dll/.so was built for the
1427 // same architecture as Hotspot is running on
1428 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1429 void * result = LoadLibrary(name);
1430 if (result != NULL) {
1431 return result;
1432 }
1433
1434 DWORD errcode = GetLastError();
1435 if (errcode == ERROR_MOD_NOT_FOUND) {
1436 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1437 ebuf[ebuflen - 1] = '\0';
1438 return NULL;
1439 }
1440
1441 // Parsing dll below
1442 // If we can read dll-info and find that dll was built
1443 // for an architecture other than Hotspot is running in
1444 // - then print to buffer "DLL was built for a different architecture"
1445 // else call os::lasterror to obtain system error message
1446
1447 // Read system error message into ebuf
1448 // It may or may not be overwritten below (in the for loop and just above)
1449 lasterror(ebuf, (size_t) ebuflen);
1450 ebuf[ebuflen - 1] = '\0';
1451 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1452 if (fd < 0) {
1453 return NULL;
1454 }
1455
1456 uint32_t signature_offset;
1457 uint16_t lib_arch = 0;
1458 bool failed_to_get_lib_arch =
1459 ( // Go to position 3c in the dll
1460 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1461 ||
1462 // Read location of signature
1463 (sizeof(signature_offset) !=
1464 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1465 ||
1466 // Go to COFF File Header in dll
1467 // that is located after "signature" (4 bytes long)
1468 (os::seek_to_file_offset(fd,
1469 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1470 ||
1471 // Read field that contains code of architecture
1472 // that dll was built for
1473 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1474 );
1475
1476 ::close(fd);
1477 if (failed_to_get_lib_arch) {
1478 // file i/o error - report os::lasterror(...) msg
1479 return NULL;
1480 }
1481
1482 typedef struct {
1483 uint16_t arch_code;
1484 char* arch_name;
1485 } arch_t;
1486
1487 static const arch_t arch_array[] = {
1488 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1489 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1490 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1491 };
1492 #if (defined _M_IA64)
1493 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1494 #elif (defined _M_AMD64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1496 #elif (defined _M_IX86)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1498 #else
1499 #error Method os::dll_load requires that one of following \
1500 is defined :_M_IA64,_M_AMD64 or _M_IX86
1501 #endif
1502
1503
1504 // Obtain a string for printf operation
1505 // lib_arch_str shall contain string what platform this .dll was built for
1506 // running_arch_str shall string contain what platform Hotspot was built for
1507 char *running_arch_str = NULL, *lib_arch_str = NULL;
1508 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1509 if (lib_arch == arch_array[i].arch_code) {
1510 lib_arch_str = arch_array[i].arch_name;
1511 }
1512 if (running_arch == arch_array[i].arch_code) {
1513 running_arch_str = arch_array[i].arch_name;
1514 }
1515 }
1516
1517 assert(running_arch_str,
1518 "Didn't find running architecture code in arch_array");
1519
1520 // If the architecture is right
1521 // but some other error took place - report os::lasterror(...) msg
1522 if (lib_arch == running_arch) {
1523 return NULL;
1524 }
1525
1526 if (lib_arch_str != NULL) {
1527 ::_snprintf(ebuf, ebuflen - 1,
1528 "Can't load %s-bit .dll on a %s-bit platform",
1529 lib_arch_str, running_arch_str);
1530 } else {
1531 // don't know what architecture this dll was build for
1532 ::_snprintf(ebuf, ebuflen - 1,
1533 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1534 lib_arch, running_arch_str);
1535 }
1536
1537 return NULL;
1538 }
1539
1540 void os::print_dll_info(outputStream *st) {
1541 st->print_cr("Dynamic libraries:");
1542 get_loaded_modules_info(_print_module, (void *)st);
1543 }
1544
1545 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1546 HANDLE hProcess;
1547
1548 # define MAX_NUM_MODULES 128
1549 HMODULE modules[MAX_NUM_MODULES];
1550 static char filename[MAX_PATH];
1551 int result = 0;
1552
1553 if (!os::PSApiDll::PSApiAvailable()) {
1554 return 0;
1555 }
1556
1557 int pid = os::current_process_id();
1558 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1559 FALSE, pid);
1560 if (hProcess == NULL) return 0;
1561
1562 DWORD size_needed;
1563 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1564 sizeof(modules), &size_needed)) {
1565 CloseHandle(hProcess);
1566 return 0;
1567 }
1568
1569 // number of modules that are currently loaded
1570 int num_modules = size_needed / sizeof(HMODULE);
1571
1572 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1573 // Get Full pathname:
1574 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1575 filename, sizeof(filename))) {
1576 filename[0] = '\0';
1577 }
1578
1579 MODULEINFO modinfo;
1580 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1581 &modinfo, sizeof(modinfo))) {
1582 modinfo.lpBaseOfDll = NULL;
1583 modinfo.SizeOfImage = 0;
1584 }
1585
1586 // Invoke callback function
1587 result = callback(filename, (address)modinfo.lpBaseOfDll,
1588 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1589 if (result) break;
1590 }
1591
1592 CloseHandle(hProcess);
1593 return result;
1594 }
1595
1596 #ifndef PRODUCT
1597 bool os::get_host_name(char* buf, size_t buflen) {
1598 DWORD size = (DWORD)buflen;
1599 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1600 }
1601 #endif // PRODUCT
1602
1603 void os::get_summary_os_info(char* buf, size_t buflen) {
1604 stringStream sst(buf, buflen);
1605 os::win32::print_windows_version(&sst);
1606 // chop off newline character
1607 char* nl = strchr(buf, '\n');
1608 if (nl != NULL) *nl = '\0';
1609 }
1610
1611 void os::print_os_info_brief(outputStream* st) {
1612 os::print_os_info(st);
1613 }
1614
1615 void os::print_os_info(outputStream* st) {
1616 #ifdef ASSERT
1617 char buffer[1024];
1618 st->print("HostName: ");
1619 if (get_host_name(buffer, sizeof(buffer))) {
1620 st->print("%s ", buffer);
1621 } else {
1622 st->print("N/A ");
1623 }
1624 #endif
1625 st->print("OS:");
1626 os::win32::print_windows_version(st);
1627 }
1628
1629 void os::win32::print_windows_version(outputStream* st) {
1630 OSVERSIONINFOEX osvi;
1631 VS_FIXEDFILEINFO *file_info;
1632 TCHAR kernel32_path[MAX_PATH];
1633 UINT len, ret;
1634
1635 // Use the GetVersionEx information to see if we're on a server or
1636 // workstation edition of Windows. Starting with Windows 8.1 we can't
1637 // trust the OS version information returned by this API.
1638 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1639 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1640 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1641 st->print_cr("Call to GetVersionEx failed");
1642 return;
1643 }
1644 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1645
1646 // Get the full path to \Windows\System32\kernel32.dll and use that for
1647 // determining what version of Windows we're running on.
1648 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1649 ret = GetSystemDirectory(kernel32_path, len);
1650 if (ret == 0 || ret > len) {
1651 st->print_cr("Call to GetSystemDirectory failed");
1652 return;
1653 }
1654 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1655
1656 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1657 if (version_size == 0) {
1658 st->print_cr("Call to GetFileVersionInfoSize failed");
1659 return;
1660 }
1661
1662 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1663 if (version_info == NULL) {
1664 st->print_cr("Failed to allocate version_info");
1665 return;
1666 }
1667
1668 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1669 os::free(version_info);
1670 st->print_cr("Call to GetFileVersionInfo failed");
1671 return;
1672 }
1673
1674 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1675 os::free(version_info);
1676 st->print_cr("Call to VerQueryValue failed");
1677 return;
1678 }
1679
1680 int major_version = HIWORD(file_info->dwProductVersionMS);
1681 int minor_version = LOWORD(file_info->dwProductVersionMS);
1682 int build_number = HIWORD(file_info->dwProductVersionLS);
1683 int build_minor = LOWORD(file_info->dwProductVersionLS);
1684 int os_vers = major_version * 1000 + minor_version;
1685 os::free(version_info);
1686
1687 st->print(" Windows ");
1688 switch (os_vers) {
1689
1690 case 6000:
1691 if (is_workstation) {
1692 st->print("Vista");
1693 } else {
1694 st->print("Server 2008");
1695 }
1696 break;
1697
1698 case 6001:
1699 if (is_workstation) {
1700 st->print("7");
1701 } else {
1702 st->print("Server 2008 R2");
1703 }
1704 break;
1705
1706 case 6002:
1707 if (is_workstation) {
1708 st->print("8");
1709 } else {
1710 st->print("Server 2012");
1711 }
1712 break;
1713
1714 case 6003:
1715 if (is_workstation) {
1716 st->print("8.1");
1717 } else {
1718 st->print("Server 2012 R2");
1719 }
1720 break;
1721
1722 case 10000:
1723 if (is_workstation) {
1724 st->print("10");
1725 } else {
1726 // The server version name of Windows 10 is not known at this time
1727 st->print("%d.%d", major_version, minor_version);
1728 }
1729 break;
1730
1731 default:
1732 // Unrecognized windows, print out its major and minor versions
1733 st->print("%d.%d", major_version, minor_version);
1734 break;
1735 }
1736
1737 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1738 // find out whether we are running on 64 bit processor or not
1739 SYSTEM_INFO si;
1740 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1741 os::Kernel32Dll::GetNativeSystemInfo(&si);
1742 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1743 st->print(" , 64 bit");
1744 }
1745
1746 st->print(" Build %d", build_number);
1747 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1748 st->cr();
1749 }
1750
1751 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1752 // Nothing to do for now.
1753 }
1754
1755 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1756 HKEY key;
1757 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1758 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1759 if (status == ERROR_SUCCESS) {
1760 DWORD size = (DWORD)buflen;
1761 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1762 if (status != ERROR_SUCCESS) {
1763 strncpy(buf, "## __CPU__", buflen);
1764 }
1765 RegCloseKey(key);
1766 } else {
1767 // Put generic cpu info to return
1768 strncpy(buf, "## __CPU__", buflen);
1769 }
1770 }
1771
1772 void os::print_memory_info(outputStream* st) {
1773 st->print("Memory:");
1774 st->print(" %dk page", os::vm_page_size()>>10);
1775
1776 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1777 // value if total memory is larger than 4GB
1778 MEMORYSTATUSEX ms;
1779 ms.dwLength = sizeof(ms);
1780 GlobalMemoryStatusEx(&ms);
1781
1782 st->print(", physical %uk", os::physical_memory() >> 10);
1783 st->print("(%uk free)", os::available_memory() >> 10);
1784
1785 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1786 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1787 st->cr();
1788 }
1789
1790 void os::print_siginfo(outputStream *st, void *siginfo) {
1791 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1792 st->print("siginfo:");
1793 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1794
1795 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1796 er->NumberParameters >= 2) {
1797 switch (er->ExceptionInformation[0]) {
1798 case 0: st->print(", reading address"); break;
1799 case 1: st->print(", writing address"); break;
1800 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1801 er->ExceptionInformation[0]);
1802 }
1803 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1804 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1805 er->NumberParameters >= 2 && UseSharedSpaces) {
1806 FileMapInfo* mapinfo = FileMapInfo::current_info();
1807 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1808 st->print("\n\nError accessing class data sharing archive." \
1809 " Mapped file inaccessible during execution, " \
1810 " possible disk/network problem.");
1811 }
1812 } else {
1813 int num = er->NumberParameters;
1814 if (num > 0) {
1815 st->print(", ExceptionInformation=");
1816 for (int i = 0; i < num; i++) {
1817 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1818 }
1819 }
1820 }
1821 st->cr();
1822 }
1823
1824 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1825 // do nothing
1826 }
1827
1828 static char saved_jvm_path[MAX_PATH] = {0};
1829
1830 // Find the full path to the current module, jvm.dll
1831 void os::jvm_path(char *buf, jint buflen) {
1832 // Error checking.
1833 if (buflen < MAX_PATH) {
1834 assert(false, "must use a large-enough buffer");
1835 buf[0] = '\0';
1836 return;
1837 }
1838 // Lazy resolve the path to current module.
1839 if (saved_jvm_path[0] != 0) {
1840 strcpy(buf, saved_jvm_path);
1841 return;
1842 }
1843
1844 buf[0] = '\0';
1845 if (Arguments::sun_java_launcher_is_altjvm()) {
1846 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1847 // for a JAVA_HOME environment variable and fix up the path so it
1848 // looks like jvm.dll is installed there (append a fake suffix
1849 // hotspot/jvm.dll).
1850 char* java_home_var = ::getenv("JAVA_HOME");
1851 if (java_home_var != NULL && java_home_var[0] != 0 &&
1852 strlen(java_home_var) < (size_t)buflen) {
1853 strncpy(buf, java_home_var, buflen);
1854
1855 // determine if this is a legacy image or modules image
1856 // modules image doesn't have "jre" subdirectory
1857 size_t len = strlen(buf);
1858 char* jrebin_p = buf + len;
1859 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1860 if (0 != _access(buf, 0)) {
1861 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1862 }
1863 len = strlen(buf);
1864 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1865 }
1866 }
1867
1868 if (buf[0] == '\0') {
1869 GetModuleFileName(vm_lib_handle, buf, buflen);
1870 }
1871 strncpy(saved_jvm_path, buf, MAX_PATH);
1872 saved_jvm_path[MAX_PATH - 1] = '\0';
1873 }
1874
1875
1876 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1877 #ifndef _WIN64
1878 st->print("_");
1879 #endif
1880 }
1881
1882
1883 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1884 #ifndef _WIN64
1885 st->print("@%d", args_size * sizeof(int));
1886 #endif
1887 }
1888
1889 // This method is a copy of JDK's sysGetLastErrorString
1890 // from src/windows/hpi/src/system_md.c
1891
1892 size_t os::lasterror(char* buf, size_t len) {
1893 DWORD errval;
1894
1895 if ((errval = GetLastError()) != 0) {
1896 // DOS error
1897 size_t n = (size_t)FormatMessage(
1898 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1899 NULL,
1900 errval,
1901 0,
1902 buf,
1903 (DWORD)len,
1904 NULL);
1905 if (n > 3) {
1906 // Drop final '.', CR, LF
1907 if (buf[n - 1] == '\n') n--;
1908 if (buf[n - 1] == '\r') n--;
1909 if (buf[n - 1] == '.') n--;
1910 buf[n] = '\0';
1911 }
1912 return n;
1913 }
1914
1915 if (errno != 0) {
1916 // C runtime error that has no corresponding DOS error code
1917 const char* s = strerror(errno);
1918 size_t n = strlen(s);
1919 if (n >= len) n = len - 1;
1920 strncpy(buf, s, n);
1921 buf[n] = '\0';
1922 return n;
1923 }
1924
1925 return 0;
1926 }
1927
1928 int os::get_last_error() {
1929 DWORD error = GetLastError();
1930 if (error == 0) {
1931 error = errno;
1932 }
1933 return (int)error;
1934 }
1935
1936 WindowsSemaphore::WindowsSemaphore(uint value) {
1937 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1938
1939 guarantee(_semaphore != NULL, err_msg("CreateSemaphore failed with error code: %lu", GetLastError()));
1940 }
1941
1942 WindowsSemaphore::~WindowsSemaphore() {
1943 ::CloseHandle(_semaphore);
1944 }
1945
1946 void WindowsSemaphore::signal(uint count) {
1947 if (count > 0) {
1948 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1949
1950 assert(ret != 0, err_msg("ReleaseSemaphore failed with error code: %lu", GetLastError()));
1951 }
1952 }
1953
1954 void WindowsSemaphore::wait() {
1955 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1956 assert(ret != WAIT_FAILED, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError()));
1957 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed with return value: %lu", ret));
1958 }
1959
1960 // sun.misc.Signal
1961 // NOTE that this is a workaround for an apparent kernel bug where if
1962 // a signal handler for SIGBREAK is installed then that signal handler
1963 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1964 // See bug 4416763.
1965 static void (*sigbreakHandler)(int) = NULL;
1966
1967 static void UserHandler(int sig, void *siginfo, void *context) {
1968 os::signal_notify(sig);
1969 // We need to reinstate the signal handler each time...
1970 os::signal(sig, (void*)UserHandler);
1971 }
1972
1973 void* os::user_handler() {
1974 return (void*) UserHandler;
1975 }
1976
1977 void* os::signal(int signal_number, void* handler) {
1978 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1979 void (*oldHandler)(int) = sigbreakHandler;
1980 sigbreakHandler = (void (*)(int)) handler;
1981 return (void*) oldHandler;
1982 } else {
1983 return (void*)::signal(signal_number, (void (*)(int))handler);
1984 }
1985 }
1986
1987 void os::signal_raise(int signal_number) {
1988 raise(signal_number);
1989 }
1990
1991 // The Win32 C runtime library maps all console control events other than ^C
1992 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1993 // logoff, and shutdown events. We therefore install our own console handler
1994 // that raises SIGTERM for the latter cases.
1995 //
1996 static BOOL WINAPI consoleHandler(DWORD event) {
1997 switch (event) {
1998 case CTRL_C_EVENT:
1999 if (is_error_reported()) {
2000 // Ctrl-C is pressed during error reporting, likely because the error
2001 // handler fails to abort. Let VM die immediately.
2002 os::die();
2003 }
2004
2005 os::signal_raise(SIGINT);
2006 return TRUE;
2007 break;
2008 case CTRL_BREAK_EVENT:
2009 if (sigbreakHandler != NULL) {
2010 (*sigbreakHandler)(SIGBREAK);
2011 }
2012 return TRUE;
2013 break;
2014 case CTRL_LOGOFF_EVENT: {
2015 // Don't terminate JVM if it is running in a non-interactive session,
2016 // such as a service process.
2017 USEROBJECTFLAGS flags;
2018 HANDLE handle = GetProcessWindowStation();
2019 if (handle != NULL &&
2020 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2021 sizeof(USEROBJECTFLAGS), NULL)) {
2022 // If it is a non-interactive session, let next handler to deal
2023 // with it.
2024 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2025 return FALSE;
2026 }
2027 }
2028 }
2029 case CTRL_CLOSE_EVENT:
2030 case CTRL_SHUTDOWN_EVENT:
2031 os::signal_raise(SIGTERM);
2032 return TRUE;
2033 break;
2034 default:
2035 break;
2036 }
2037 return FALSE;
2038 }
2039
2040 // The following code is moved from os.cpp for making this
2041 // code platform specific, which it is by its very nature.
2042
2043 // Return maximum OS signal used + 1 for internal use only
2044 // Used as exit signal for signal_thread
2045 int os::sigexitnum_pd() {
2046 return NSIG;
2047 }
2048
2049 // a counter for each possible signal value, including signal_thread exit signal
2050 static volatile jint pending_signals[NSIG+1] = { 0 };
2051 static HANDLE sig_sem = NULL;
2052
2053 void os::signal_init_pd() {
2054 // Initialize signal structures
2055 memset((void*)pending_signals, 0, sizeof(pending_signals));
2056
2057 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2058
2059 // Programs embedding the VM do not want it to attempt to receive
2060 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2061 // shutdown hooks mechanism introduced in 1.3. For example, when
2062 // the VM is run as part of a Windows NT service (i.e., a servlet
2063 // engine in a web server), the correct behavior is for any console
2064 // control handler to return FALSE, not TRUE, because the OS's
2065 // "final" handler for such events allows the process to continue if
2066 // it is a service (while terminating it if it is not a service).
2067 // To make this behavior uniform and the mechanism simpler, we
2068 // completely disable the VM's usage of these console events if -Xrs
2069 // (=ReduceSignalUsage) is specified. This means, for example, that
2070 // the CTRL-BREAK thread dump mechanism is also disabled in this
2071 // case. See bugs 4323062, 4345157, and related bugs.
2072
2073 if (!ReduceSignalUsage) {
2074 // Add a CTRL-C handler
2075 SetConsoleCtrlHandler(consoleHandler, TRUE);
2076 }
2077 }
2078
2079 void os::signal_notify(int signal_number) {
2080 BOOL ret;
2081 if (sig_sem != NULL) {
2082 Atomic::inc(&pending_signals[signal_number]);
2083 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2084 assert(ret != 0, "ReleaseSemaphore() failed");
2085 }
2086 }
2087
2088 static int check_pending_signals(bool wait_for_signal) {
2089 DWORD ret;
2090 while (true) {
2091 for (int i = 0; i < NSIG + 1; i++) {
2092 jint n = pending_signals[i];
2093 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2094 return i;
2095 }
2096 }
2097 if (!wait_for_signal) {
2098 return -1;
2099 }
2100
2101 JavaThread *thread = JavaThread::current();
2102
2103 ThreadBlockInVM tbivm(thread);
2104
2105 bool threadIsSuspended;
2106 do {
2107 thread->set_suspend_equivalent();
2108 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2109 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2110 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2111
2112 // were we externally suspended while we were waiting?
2113 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2114 if (threadIsSuspended) {
2115 // The semaphore has been incremented, but while we were waiting
2116 // another thread suspended us. We don't want to continue running
2117 // while suspended because that would surprise the thread that
2118 // suspended us.
2119 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2120 assert(ret != 0, "ReleaseSemaphore() failed");
2121
2122 thread->java_suspend_self();
2123 }
2124 } while (threadIsSuspended);
2125 }
2126 }
2127
2128 int os::signal_lookup() {
2129 return check_pending_signals(false);
2130 }
2131
2132 int os::signal_wait() {
2133 return check_pending_signals(true);
2134 }
2135
2136 // Implicit OS exception handling
2137
2138 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2139 address handler) {
2140 JavaThread* thread = JavaThread::current();
2141 // Save pc in thread
2142 #ifdef _M_IA64
2143 // Do not blow up if no thread info available.
2144 if (thread) {
2145 // Saving PRECISE pc (with slot information) in thread.
2146 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2147 // Convert precise PC into "Unix" format
2148 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2149 thread->set_saved_exception_pc((address)precise_pc);
2150 }
2151 // Set pc to handler
2152 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2153 // Clear out psr.ri (= Restart Instruction) in order to continue
2154 // at the beginning of the target bundle.
2155 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2156 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2157 #else
2158 #ifdef _M_AMD64
2159 // Do not blow up if no thread info available.
2160 if (thread) {
2161 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2162 }
2163 // Set pc to handler
2164 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2165 #else
2166 // Do not blow up if no thread info available.
2167 if (thread) {
2168 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2169 }
2170 // Set pc to handler
2171 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2172 #endif
2173 #endif
2174
2175 // Continue the execution
2176 return EXCEPTION_CONTINUE_EXECUTION;
2177 }
2178
2179
2180 // Used for PostMortemDump
2181 extern "C" void safepoints();
2182 extern "C" void find(int x);
2183 extern "C" void events();
2184
2185 // According to Windows API documentation, an illegal instruction sequence should generate
2186 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2187 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2188 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2189
2190 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2191
2192 // From "Execution Protection in the Windows Operating System" draft 0.35
2193 // Once a system header becomes available, the "real" define should be
2194 // included or copied here.
2195 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2196
2197 // Handle NAT Bit consumption on IA64.
2198 #ifdef _M_IA64
2199 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2200 #endif
2201
2202 // Windows Vista/2008 heap corruption check
2203 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2204
2205 #define def_excpt(val) #val, val
2206
2207 struct siglabel {
2208 char *name;
2209 int number;
2210 };
2211
2212 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2213 // C++ compiler contain this error code. Because this is a compiler-generated
2214 // error, the code is not listed in the Win32 API header files.
2215 // The code is actually a cryptic mnemonic device, with the initial "E"
2216 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2217 // ASCII values of "msc".
2218
2219 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2220
2221
2222 struct siglabel exceptlabels[] = {
2223 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2224 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2225 def_excpt(EXCEPTION_BREAKPOINT),
2226 def_excpt(EXCEPTION_SINGLE_STEP),
2227 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2228 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2229 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2230 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2231 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2232 def_excpt(EXCEPTION_FLT_OVERFLOW),
2233 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2234 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2235 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2236 def_excpt(EXCEPTION_INT_OVERFLOW),
2237 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2238 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2239 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2240 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2241 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2242 def_excpt(EXCEPTION_STACK_OVERFLOW),
2243 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2244 def_excpt(EXCEPTION_GUARD_PAGE),
2245 def_excpt(EXCEPTION_INVALID_HANDLE),
2246 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2247 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2248 #ifdef _M_IA64
2249 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2250 #endif
2251 NULL, 0
2252 };
2253
2254 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2255 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2256 if (exceptlabels[i].number == exception_code) {
2257 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2258 return buf;
2259 }
2260 }
2261
2262 return NULL;
2263 }
2264
2265 //-----------------------------------------------------------------------------
2266 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2267 // handle exception caused by idiv; should only happen for -MinInt/-1
2268 // (division by zero is handled explicitly)
2269 #ifdef _M_IA64
2270 assert(0, "Fix Handle_IDiv_Exception");
2271 #else
2272 #ifdef _M_AMD64
2273 PCONTEXT ctx = exceptionInfo->ContextRecord;
2274 address pc = (address)ctx->Rip;
2275 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2276 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2277 if (pc[0] == 0xF7) {
2278 // set correct result values and continue after idiv instruction
2279 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2280 } else {
2281 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2282 }
2283 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2284 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2285 // idiv opcode (0xF7).
2286 ctx->Rdx = (DWORD)0; // remainder
2287 // Continue the execution
2288 #else
2289 PCONTEXT ctx = exceptionInfo->ContextRecord;
2290 address pc = (address)ctx->Eip;
2291 assert(pc[0] == 0xF7, "not an idiv opcode");
2292 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2293 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2294 // set correct result values and continue after idiv instruction
2295 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2296 ctx->Eax = (DWORD)min_jint; // result
2297 ctx->Edx = (DWORD)0; // remainder
2298 // Continue the execution
2299 #endif
2300 #endif
2301 return EXCEPTION_CONTINUE_EXECUTION;
2302 }
2303
2304 //-----------------------------------------------------------------------------
2305 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2306 PCONTEXT ctx = exceptionInfo->ContextRecord;
2307 #ifndef _WIN64
2308 // handle exception caused by native method modifying control word
2309 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2310
2311 switch (exception_code) {
2312 case EXCEPTION_FLT_DENORMAL_OPERAND:
2313 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2314 case EXCEPTION_FLT_INEXACT_RESULT:
2315 case EXCEPTION_FLT_INVALID_OPERATION:
2316 case EXCEPTION_FLT_OVERFLOW:
2317 case EXCEPTION_FLT_STACK_CHECK:
2318 case EXCEPTION_FLT_UNDERFLOW:
2319 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2320 if (fp_control_word != ctx->FloatSave.ControlWord) {
2321 // Restore FPCW and mask out FLT exceptions
2322 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2323 // Mask out pending FLT exceptions
2324 ctx->FloatSave.StatusWord &= 0xffffff00;
2325 return EXCEPTION_CONTINUE_EXECUTION;
2326 }
2327 }
2328
2329 if (prev_uef_handler != NULL) {
2330 // We didn't handle this exception so pass it to the previous
2331 // UnhandledExceptionFilter.
2332 return (prev_uef_handler)(exceptionInfo);
2333 }
2334 #else // !_WIN64
2335 // On Windows, the mxcsr control bits are non-volatile across calls
2336 // See also CR 6192333
2337 //
2338 jint MxCsr = INITIAL_MXCSR;
2339 // we can't use StubRoutines::addr_mxcsr_std()
2340 // because in Win64 mxcsr is not saved there
2341 if (MxCsr != ctx->MxCsr) {
2342 ctx->MxCsr = MxCsr;
2343 return EXCEPTION_CONTINUE_EXECUTION;
2344 }
2345 #endif // !_WIN64
2346
2347 return EXCEPTION_CONTINUE_SEARCH;
2348 }
2349
2350 static inline void report_error(Thread* t, DWORD exception_code,
2351 address addr, void* siginfo, void* context) {
2352 VMError err(t, exception_code, addr, siginfo, context);
2353 err.report_and_die();
2354
2355 // If UseOsErrorReporting, this will return here and save the error file
2356 // somewhere where we can find it in the minidump.
2357 }
2358
2359 //-----------------------------------------------------------------------------
2360 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2361 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2362 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2363 #ifdef _M_IA64
2364 // On Itanium, we need the "precise pc", which has the slot number coded
2365 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2366 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2367 // Convert the pc to "Unix format", which has the slot number coded
2368 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2369 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2370 // information is saved in the Unix format.
2371 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2372 #else
2373 #ifdef _M_AMD64
2374 address pc = (address) exceptionInfo->ContextRecord->Rip;
2375 #else
2376 address pc = (address) exceptionInfo->ContextRecord->Eip;
2377 #endif
2378 #endif
2379 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2380
2381 // Handle SafeFetch32 and SafeFetchN exceptions.
2382 if (StubRoutines::is_safefetch_fault(pc)) {
2383 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2384 }
2385
2386 #ifndef _WIN64
2387 // Execution protection violation - win32 running on AMD64 only
2388 // Handled first to avoid misdiagnosis as a "normal" access violation;
2389 // This is safe to do because we have a new/unique ExceptionInformation
2390 // code for this condition.
2391 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2392 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2393 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2394 address addr = (address) exceptionRecord->ExceptionInformation[1];
2395
2396 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2397 int page_size = os::vm_page_size();
2398
2399 // Make sure the pc and the faulting address are sane.
2400 //
2401 // If an instruction spans a page boundary, and the page containing
2402 // the beginning of the instruction is executable but the following
2403 // page is not, the pc and the faulting address might be slightly
2404 // different - we still want to unguard the 2nd page in this case.
2405 //
2406 // 15 bytes seems to be a (very) safe value for max instruction size.
2407 bool pc_is_near_addr =
2408 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2409 bool instr_spans_page_boundary =
2410 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2411 (intptr_t) page_size) > 0);
2412
2413 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2414 static volatile address last_addr =
2415 (address) os::non_memory_address_word();
2416
2417 // In conservative mode, don't unguard unless the address is in the VM
2418 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2419 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2420
2421 // Set memory to RWX and retry
2422 address page_start =
2423 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2424 bool res = os::protect_memory((char*) page_start, page_size,
2425 os::MEM_PROT_RWX);
2426
2427 if (PrintMiscellaneous && Verbose) {
2428 char buf[256];
2429 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2430 "at " INTPTR_FORMAT
2431 ", unguarding " INTPTR_FORMAT ": %s", addr,
2432 page_start, (res ? "success" : strerror(errno)));
2433 tty->print_raw_cr(buf);
2434 }
2435
2436 // Set last_addr so if we fault again at the same address, we don't
2437 // end up in an endless loop.
2438 //
2439 // There are two potential complications here. Two threads trapping
2440 // at the same address at the same time could cause one of the
2441 // threads to think it already unguarded, and abort the VM. Likely
2442 // very rare.
2443 //
2444 // The other race involves two threads alternately trapping at
2445 // different addresses and failing to unguard the page, resulting in
2446 // an endless loop. This condition is probably even more unlikely
2447 // than the first.
2448 //
2449 // Although both cases could be avoided by using locks or thread
2450 // local last_addr, these solutions are unnecessary complication:
2451 // this handler is a best-effort safety net, not a complete solution.
2452 // It is disabled by default and should only be used as a workaround
2453 // in case we missed any no-execute-unsafe VM code.
2454
2455 last_addr = addr;
2456
2457 return EXCEPTION_CONTINUE_EXECUTION;
2458 }
2459 }
2460
2461 // Last unguard failed or not unguarding
2462 tty->print_raw_cr("Execution protection violation");
2463 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2464 exceptionInfo->ContextRecord);
2465 return EXCEPTION_CONTINUE_SEARCH;
2466 }
2467 }
2468 #endif // _WIN64
2469
2470 // Check to see if we caught the safepoint code in the
2471 // process of write protecting the memory serialization page.
2472 // It write enables the page immediately after protecting it
2473 // so just return.
2474 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2475 JavaThread* thread = (JavaThread*) t;
2476 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2477 address addr = (address) exceptionRecord->ExceptionInformation[1];
2478 if (os::is_memory_serialize_page(thread, addr)) {
2479 // Block current thread until the memory serialize page permission restored.
2480 os::block_on_serialize_page_trap();
2481 return EXCEPTION_CONTINUE_EXECUTION;
2482 }
2483 }
2484
2485 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2486 VM_Version::is_cpuinfo_segv_addr(pc)) {
2487 // Verify that OS save/restore AVX registers.
2488 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2489 }
2490
2491 if (t != NULL && t->is_Java_thread()) {
2492 JavaThread* thread = (JavaThread*) t;
2493 bool in_java = thread->thread_state() == _thread_in_Java;
2494
2495 // Handle potential stack overflows up front.
2496 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2497 if (os::uses_stack_guard_pages()) {
2498 #ifdef _M_IA64
2499 // Use guard page for register stack.
2500 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2501 address addr = (address) exceptionRecord->ExceptionInformation[1];
2502 // Check for a register stack overflow on Itanium
2503 if (thread->addr_inside_register_stack_red_zone(addr)) {
2504 // Fatal red zone violation happens if the Java program
2505 // catches a StackOverflow error and does so much processing
2506 // that it runs beyond the unprotected yellow guard zone. As
2507 // a result, we are out of here.
2508 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2509 } else if(thread->addr_inside_register_stack(addr)) {
2510 // Disable the yellow zone which sets the state that
2511 // we've got a stack overflow problem.
2512 if (thread->stack_yellow_zone_enabled()) {
2513 thread->disable_stack_yellow_zone();
2514 }
2515 // Give us some room to process the exception.
2516 thread->disable_register_stack_guard();
2517 // Tracing with +Verbose.
2518 if (Verbose) {
2519 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2520 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2521 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2522 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2523 thread->register_stack_base(),
2524 thread->register_stack_base() + thread->stack_size());
2525 }
2526
2527 // Reguard the permanent register stack red zone just to be sure.
2528 // We saw Windows silently disabling this without telling us.
2529 thread->enable_register_stack_red_zone();
2530
2531 return Handle_Exception(exceptionInfo,
2532 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2533 }
2534 #endif
2535 if (thread->stack_yellow_zone_enabled()) {
2536 // Yellow zone violation. The o/s has unprotected the first yellow
2537 // zone page for us. Note: must call disable_stack_yellow_zone to
2538 // update the enabled status, even if the zone contains only one page.
2539 thread->disable_stack_yellow_zone();
2540 // If not in java code, return and hope for the best.
2541 return in_java
2542 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2543 : EXCEPTION_CONTINUE_EXECUTION;
2544 } else {
2545 // Fatal red zone violation.
2546 thread->disable_stack_red_zone();
2547 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2548 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2549 exceptionInfo->ContextRecord);
2550 return EXCEPTION_CONTINUE_SEARCH;
2551 }
2552 } else if (in_java) {
2553 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2554 // a one-time-only guard page, which it has released to us. The next
2555 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2556 return Handle_Exception(exceptionInfo,
2557 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2558 } else {
2559 // Can only return and hope for the best. Further stack growth will
2560 // result in an ACCESS_VIOLATION.
2561 return EXCEPTION_CONTINUE_EXECUTION;
2562 }
2563 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2564 // Either stack overflow or null pointer exception.
2565 if (in_java) {
2566 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2567 address addr = (address) exceptionRecord->ExceptionInformation[1];
2568 address stack_end = thread->stack_base() - thread->stack_size();
2569 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2570 // Stack overflow.
2571 assert(!os::uses_stack_guard_pages(),
2572 "should be caught by red zone code above.");
2573 return Handle_Exception(exceptionInfo,
2574 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2575 }
2576 // Check for safepoint polling and implicit null
2577 // We only expect null pointers in the stubs (vtable)
2578 // the rest are checked explicitly now.
2579 CodeBlob* cb = CodeCache::find_blob(pc);
2580 if (cb != NULL) {
2581 if (os::is_poll_address(addr)) {
2582 address stub = SharedRuntime::get_poll_stub(pc);
2583 return Handle_Exception(exceptionInfo, stub);
2584 }
2585 }
2586 {
2587 #ifdef _WIN64
2588 // If it's a legal stack address map the entire region in
2589 //
2590 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2591 address addr = (address) exceptionRecord->ExceptionInformation[1];
2592 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2593 addr = (address)((uintptr_t)addr &
2594 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2595 os::commit_memory((char *)addr, thread->stack_base() - addr,
2596 !ExecMem);
2597 return EXCEPTION_CONTINUE_EXECUTION;
2598 } else
2599 #endif
2600 {
2601 // Null pointer exception.
2602 #ifdef _M_IA64
2603 // Process implicit null checks in compiled code. Note: Implicit null checks
2604 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2605 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2606 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2607 // Handle implicit null check in UEP method entry
2608 if (cb && (cb->is_frame_complete_at(pc) ||
2609 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2610 if (Verbose) {
2611 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2612 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2613 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2614 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2615 *(bundle_start + 1), *bundle_start);
2616 }
2617 return Handle_Exception(exceptionInfo,
2618 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2619 }
2620 }
2621
2622 // Implicit null checks were processed above. Hence, we should not reach
2623 // here in the usual case => die!
2624 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2625 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2626 exceptionInfo->ContextRecord);
2627 return EXCEPTION_CONTINUE_SEARCH;
2628
2629 #else // !IA64
2630
2631 // Windows 98 reports faulting addresses incorrectly
2632 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2633 !os::win32::is_nt()) {
2634 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2635 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2636 }
2637 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2638 exceptionInfo->ContextRecord);
2639 return EXCEPTION_CONTINUE_SEARCH;
2640 #endif
2641 }
2642 }
2643 }
2644
2645 #ifdef _WIN64
2646 // Special care for fast JNI field accessors.
2647 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2648 // in and the heap gets shrunk before the field access.
2649 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2650 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2651 if (addr != (address)-1) {
2652 return Handle_Exception(exceptionInfo, addr);
2653 }
2654 }
2655 #endif
2656
2657 // Stack overflow or null pointer exception in native code.
2658 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2659 exceptionInfo->ContextRecord);
2660 return EXCEPTION_CONTINUE_SEARCH;
2661 } // /EXCEPTION_ACCESS_VIOLATION
2662 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2663 #if defined _M_IA64
2664 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2665 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2666 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2667
2668 // Compiled method patched to be non entrant? Following conditions must apply:
2669 // 1. must be first instruction in bundle
2670 // 2. must be a break instruction with appropriate code
2671 if ((((uint64_t) pc & 0x0F) == 0) &&
2672 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2673 return Handle_Exception(exceptionInfo,
2674 (address)SharedRuntime::get_handle_wrong_method_stub());
2675 }
2676 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2677 #endif
2678
2679
2680 if (in_java) {
2681 switch (exception_code) {
2682 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2683 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2684
2685 case EXCEPTION_INT_OVERFLOW:
2686 return Handle_IDiv_Exception(exceptionInfo);
2687
2688 } // switch
2689 }
2690 if (((thread->thread_state() == _thread_in_Java) ||
2691 (thread->thread_state() == _thread_in_native)) &&
2692 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2693 LONG result=Handle_FLT_Exception(exceptionInfo);
2694 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2695 }
2696 }
2697
2698 if (exception_code != EXCEPTION_BREAKPOINT) {
2699 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2700 exceptionInfo->ContextRecord);
2701 }
2702 return EXCEPTION_CONTINUE_SEARCH;
2703 }
2704
2705 #ifndef _WIN64
2706 // Special care for fast JNI accessors.
2707 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2708 // the heap gets shrunk before the field access.
2709 // Need to install our own structured exception handler since native code may
2710 // install its own.
2711 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2712 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2713 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2714 address pc = (address) exceptionInfo->ContextRecord->Eip;
2715 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2716 if (addr != (address)-1) {
2717 return Handle_Exception(exceptionInfo, addr);
2718 }
2719 }
2720 return EXCEPTION_CONTINUE_SEARCH;
2721 }
2722
2723 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2724 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2725 jobject obj, \
2726 jfieldID fieldID) { \
2727 __try { \
2728 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2729 obj, \
2730 fieldID); \
2731 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2732 _exception_info())) { \
2733 } \
2734 return 0; \
2735 }
2736
2737 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2738 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2739 DEFINE_FAST_GETFIELD(jchar, char, Char)
2740 DEFINE_FAST_GETFIELD(jshort, short, Short)
2741 DEFINE_FAST_GETFIELD(jint, int, Int)
2742 DEFINE_FAST_GETFIELD(jlong, long, Long)
2743 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2744 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2745
2746 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2747 switch (type) {
2748 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2749 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2750 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2751 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2752 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2753 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2754 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2755 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2756 default: ShouldNotReachHere();
2757 }
2758 return (address)-1;
2759 }
2760 #endif
2761
2762 // Virtual Memory
2763
2764 int os::vm_page_size() { return os::win32::vm_page_size(); }
2765 int os::vm_allocation_granularity() {
2766 return os::win32::vm_allocation_granularity();
2767 }
2768
2769 // Windows large page support is available on Windows 2003. In order to use
2770 // large page memory, the administrator must first assign additional privilege
2771 // to the user:
2772 // + select Control Panel -> Administrative Tools -> Local Security Policy
2773 // + select Local Policies -> User Rights Assignment
2774 // + double click "Lock pages in memory", add users and/or groups
2775 // + reboot
2776 // Note the above steps are needed for administrator as well, as administrators
2777 // by default do not have the privilege to lock pages in memory.
2778 //
2779 // Note about Windows 2003: although the API supports committing large page
2780 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2781 // scenario, I found through experiment it only uses large page if the entire
2782 // memory region is reserved and committed in a single VirtualAlloc() call.
2783 // This makes Windows large page support more or less like Solaris ISM, in
2784 // that the entire heap must be committed upfront. This probably will change
2785 // in the future, if so the code below needs to be revisited.
2786
2787 #ifndef MEM_LARGE_PAGES
2788 #define MEM_LARGE_PAGES 0x20000000
2789 #endif
2790
2791 static HANDLE _hProcess;
2792 static HANDLE _hToken;
2793
2794 // Container for NUMA node list info
2795 class NUMANodeListHolder {
2796 private:
2797 int *_numa_used_node_list; // allocated below
2798 int _numa_used_node_count;
2799
2800 void free_node_list() {
2801 if (_numa_used_node_list != NULL) {
2802 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2803 }
2804 }
2805
2806 public:
2807 NUMANodeListHolder() {
2808 _numa_used_node_count = 0;
2809 _numa_used_node_list = NULL;
2810 // do rest of initialization in build routine (after function pointers are set up)
2811 }
2812
2813 ~NUMANodeListHolder() {
2814 free_node_list();
2815 }
2816
2817 bool build() {
2818 DWORD_PTR proc_aff_mask;
2819 DWORD_PTR sys_aff_mask;
2820 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2821 ULONG highest_node_number;
2822 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2823 free_node_list();
2824 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2825 for (unsigned int i = 0; i <= highest_node_number; i++) {
2826 ULONGLONG proc_mask_numa_node;
2827 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2828 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2829 _numa_used_node_list[_numa_used_node_count++] = i;
2830 }
2831 }
2832 return (_numa_used_node_count > 1);
2833 }
2834
2835 int get_count() { return _numa_used_node_count; }
2836 int get_node_list_entry(int n) {
2837 // for indexes out of range, returns -1
2838 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2839 }
2840
2841 } numa_node_list_holder;
2842
2843
2844
2845 static size_t _large_page_size = 0;
2846
2847 static bool resolve_functions_for_large_page_init() {
2848 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2849 os::Advapi32Dll::AdvapiAvailable();
2850 }
2851
2852 static bool request_lock_memory_privilege() {
2853 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2854 os::current_process_id());
2855
2856 LUID luid;
2857 if (_hProcess != NULL &&
2858 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2859 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2860
2861 TOKEN_PRIVILEGES tp;
2862 tp.PrivilegeCount = 1;
2863 tp.Privileges[0].Luid = luid;
2864 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2865
2866 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2867 // privilege. Check GetLastError() too. See MSDN document.
2868 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2869 (GetLastError() == ERROR_SUCCESS)) {
2870 return true;
2871 }
2872 }
2873
2874 return false;
2875 }
2876
2877 static void cleanup_after_large_page_init() {
2878 if (_hProcess) CloseHandle(_hProcess);
2879 _hProcess = NULL;
2880 if (_hToken) CloseHandle(_hToken);
2881 _hToken = NULL;
2882 }
2883
2884 static bool numa_interleaving_init() {
2885 bool success = false;
2886 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2887
2888 // print a warning if UseNUMAInterleaving flag is specified on command line
2889 bool warn_on_failure = use_numa_interleaving_specified;
2890 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2891
2892 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2893 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2894 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2895
2896 if (os::Kernel32Dll::NumaCallsAvailable()) {
2897 if (numa_node_list_holder.build()) {
2898 if (PrintMiscellaneous && Verbose) {
2899 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2900 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2901 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2902 }
2903 tty->print("\n");
2904 }
2905 success = true;
2906 } else {
2907 WARN("Process does not cover multiple NUMA nodes.");
2908 }
2909 } else {
2910 WARN("NUMA Interleaving is not supported by the operating system.");
2911 }
2912 if (!success) {
2913 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2914 }
2915 return success;
2916 #undef WARN
2917 }
2918
2919 // this routine is used whenever we need to reserve a contiguous VA range
2920 // but we need to make separate VirtualAlloc calls for each piece of the range
2921 // Reasons for doing this:
2922 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2923 // * UseNUMAInterleaving requires a separate node for each piece
2924 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2925 DWORD prot,
2926 bool should_inject_error = false) {
2927 char * p_buf;
2928 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2929 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2930 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2931
2932 // first reserve enough address space in advance since we want to be
2933 // able to break a single contiguous virtual address range into multiple
2934 // large page commits but WS2003 does not allow reserving large page space
2935 // so we just use 4K pages for reserve, this gives us a legal contiguous
2936 // address space. then we will deallocate that reservation, and re alloc
2937 // using large pages
2938 const size_t size_of_reserve = bytes + chunk_size;
2939 if (bytes > size_of_reserve) {
2940 // Overflowed.
2941 return NULL;
2942 }
2943 p_buf = (char *) VirtualAlloc(addr,
2944 size_of_reserve, // size of Reserve
2945 MEM_RESERVE,
2946 PAGE_READWRITE);
2947 // If reservation failed, return NULL
2948 if (p_buf == NULL) return NULL;
2949 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2950 os::release_memory(p_buf, bytes + chunk_size);
2951
2952 // we still need to round up to a page boundary (in case we are using large pages)
2953 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2954 // instead we handle this in the bytes_to_rq computation below
2955 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2956
2957 // now go through and allocate one chunk at a time until all bytes are
2958 // allocated
2959 size_t bytes_remaining = bytes;
2960 // An overflow of align_size_up() would have been caught above
2961 // in the calculation of size_of_reserve.
2962 char * next_alloc_addr = p_buf;
2963 HANDLE hProc = GetCurrentProcess();
2964
2965 #ifdef ASSERT
2966 // Variable for the failure injection
2967 long ran_num = os::random();
2968 size_t fail_after = ran_num % bytes;
2969 #endif
2970
2971 int count=0;
2972 while (bytes_remaining) {
2973 // select bytes_to_rq to get to the next chunk_size boundary
2974
2975 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2976 // Note allocate and commit
2977 char * p_new;
2978
2979 #ifdef ASSERT
2980 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2981 #else
2982 const bool inject_error_now = false;
2983 #endif
2984
2985 if (inject_error_now) {
2986 p_new = NULL;
2987 } else {
2988 if (!UseNUMAInterleaving) {
2989 p_new = (char *) VirtualAlloc(next_alloc_addr,
2990 bytes_to_rq,
2991 flags,
2992 prot);
2993 } else {
2994 // get the next node to use from the used_node_list
2995 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2996 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2997 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2998 next_alloc_addr,
2999 bytes_to_rq,
3000 flags,
3001 prot,
3002 node);
3003 }
3004 }
3005
3006 if (p_new == NULL) {
3007 // Free any allocated pages
3008 if (next_alloc_addr > p_buf) {
3009 // Some memory was committed so release it.
3010 size_t bytes_to_release = bytes - bytes_remaining;
3011 // NMT has yet to record any individual blocks, so it
3012 // need to create a dummy 'reserve' record to match
3013 // the release.
3014 MemTracker::record_virtual_memory_reserve((address)p_buf,
3015 bytes_to_release, CALLER_PC);
3016 os::release_memory(p_buf, bytes_to_release);
3017 }
3018 #ifdef ASSERT
3019 if (should_inject_error) {
3020 if (TracePageSizes && Verbose) {
3021 tty->print_cr("Reserving pages individually failed.");
3022 }
3023 }
3024 #endif
3025 return NULL;
3026 }
3027
3028 bytes_remaining -= bytes_to_rq;
3029 next_alloc_addr += bytes_to_rq;
3030 count++;
3031 }
3032 // Although the memory is allocated individually, it is returned as one.
3033 // NMT records it as one block.
3034 if ((flags & MEM_COMMIT) != 0) {
3035 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3036 } else {
3037 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3038 }
3039
3040 // made it this far, success
3041 return p_buf;
3042 }
3043
3044
3045
3046 void os::large_page_init() {
3047 if (!UseLargePages) return;
3048
3049 // print a warning if any large page related flag is specified on command line
3050 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3051 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3052 bool success = false;
3053
3054 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3055 if (resolve_functions_for_large_page_init()) {
3056 if (request_lock_memory_privilege()) {
3057 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3058 if (s) {
3059 #if defined(IA32) || defined(AMD64)
3060 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3061 WARN("JVM cannot use large pages bigger than 4mb.");
3062 } else {
3063 #endif
3064 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3065 _large_page_size = LargePageSizeInBytes;
3066 } else {
3067 _large_page_size = s;
3068 }
3069 success = true;
3070 #if defined(IA32) || defined(AMD64)
3071 }
3072 #endif
3073 } else {
3074 WARN("Large page is not supported by the processor.");
3075 }
3076 } else {
3077 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3078 }
3079 } else {
3080 WARN("Large page is not supported by the operating system.");
3081 }
3082 #undef WARN
3083
3084 const size_t default_page_size = (size_t) vm_page_size();
3085 if (success && _large_page_size > default_page_size) {
3086 _page_sizes[0] = _large_page_size;
3087 _page_sizes[1] = default_page_size;
3088 _page_sizes[2] = 0;
3089 }
3090
3091 cleanup_after_large_page_init();
3092 UseLargePages = success;
3093 }
3094
3095 // On win32, one cannot release just a part of reserved memory, it's an
3096 // all or nothing deal. When we split a reservation, we must break the
3097 // reservation into two reservations.
3098 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3099 bool realloc) {
3100 if (size > 0) {
3101 release_memory(base, size);
3102 if (realloc) {
3103 reserve_memory(split, base);
3104 }
3105 if (size != split) {
3106 reserve_memory(size - split, base + split);
3107 }
3108 }
3109 }
3110
3111 // Multiple threads can race in this code but it's not possible to unmap small sections of
3112 // virtual space to get requested alignment, like posix-like os's.
3113 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3114 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3115 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3116 "Alignment must be a multiple of allocation granularity (page size)");
3117 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3118
3119 size_t extra_size = size + alignment;
3120 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3121
3122 char* aligned_base = NULL;
3123
3124 do {
3125 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3126 if (extra_base == NULL) {
3127 return NULL;
3128 }
3129 // Do manual alignment
3130 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3131
3132 os::release_memory(extra_base, extra_size);
3133
3134 aligned_base = os::reserve_memory(size, aligned_base);
3135
3136 } while (aligned_base == NULL);
3137
3138 return aligned_base;
3139 }
3140
3141 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3142 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3143 "reserve alignment");
3144 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3145 char* res;
3146 // note that if UseLargePages is on, all the areas that require interleaving
3147 // will go thru reserve_memory_special rather than thru here.
3148 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3149 if (!use_individual) {
3150 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3151 } else {
3152 elapsedTimer reserveTimer;
3153 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3154 // in numa interleaving, we have to allocate pages individually
3155 // (well really chunks of NUMAInterleaveGranularity size)
3156 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3157 if (res == NULL) {
3158 warning("NUMA page allocation failed");
3159 }
3160 if (Verbose && PrintMiscellaneous) {
3161 reserveTimer.stop();
3162 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3163 reserveTimer.milliseconds(), reserveTimer.ticks());
3164 }
3165 }
3166 assert(res == NULL || addr == NULL || addr == res,
3167 "Unexpected address from reserve.");
3168
3169 return res;
3170 }
3171
3172 // Reserve memory at an arbitrary address, only if that area is
3173 // available (and not reserved for something else).
3174 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3175 // Windows os::reserve_memory() fails of the requested address range is
3176 // not avilable.
3177 return reserve_memory(bytes, requested_addr);
3178 }
3179
3180 size_t os::large_page_size() {
3181 return _large_page_size;
3182 }
3183
3184 bool os::can_commit_large_page_memory() {
3185 // Windows only uses large page memory when the entire region is reserved
3186 // and committed in a single VirtualAlloc() call. This may change in the
3187 // future, but with Windows 2003 it's not possible to commit on demand.
3188 return false;
3189 }
3190
3191 bool os::can_execute_large_page_memory() {
3192 return true;
3193 }
3194
3195 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3196 bool exec) {
3197 assert(UseLargePages, "only for large pages");
3198
3199 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3200 return NULL; // Fallback to small pages.
3201 }
3202
3203 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3204 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3205
3206 // with large pages, there are two cases where we need to use Individual Allocation
3207 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3208 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3209 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3210 if (TracePageSizes && Verbose) {
3211 tty->print_cr("Reserving large pages individually.");
3212 }
3213 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3214 if (p_buf == NULL) {
3215 // give an appropriate warning message
3216 if (UseNUMAInterleaving) {
3217 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3218 }
3219 if (UseLargePagesIndividualAllocation) {
3220 warning("Individually allocated large pages failed, "
3221 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3222 }
3223 return NULL;
3224 }
3225
3226 return p_buf;
3227
3228 } else {
3229 if (TracePageSizes && Verbose) {
3230 tty->print_cr("Reserving large pages in a single large chunk.");
3231 }
3232 // normal policy just allocate it all at once
3233 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3234 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3235 if (res != NULL) {
3236 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3237 }
3238
3239 return res;
3240 }
3241 }
3242
3243 bool os::release_memory_special(char* base, size_t bytes) {
3244 assert(base != NULL, "Sanity check");
3245 return release_memory(base, bytes);
3246 }
3247
3248 void os::print_statistics() {
3249 }
3250
3251 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3252 int err = os::get_last_error();
3253 char buf[256];
3254 size_t buf_len = os::lasterror(buf, sizeof(buf));
3255 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3256 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3257 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3258 }
3259
3260 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3261 if (bytes == 0) {
3262 // Don't bother the OS with noops.
3263 return true;
3264 }
3265 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3266 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3267 // Don't attempt to print anything if the OS call fails. We're
3268 // probably low on resources, so the print itself may cause crashes.
3269
3270 // unless we have NUMAInterleaving enabled, the range of a commit
3271 // is always within a reserve covered by a single VirtualAlloc
3272 // in that case we can just do a single commit for the requested size
3273 if (!UseNUMAInterleaving) {
3274 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3275 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3276 return false;
3277 }
3278 if (exec) {
3279 DWORD oldprot;
3280 // Windows doc says to use VirtualProtect to get execute permissions
3281 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3282 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3283 return false;
3284 }
3285 }
3286 return true;
3287 } else {
3288
3289 // when NUMAInterleaving is enabled, the commit might cover a range that
3290 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3291 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3292 // returns represents the number of bytes that can be committed in one step.
3293 size_t bytes_remaining = bytes;
3294 char * next_alloc_addr = addr;
3295 while (bytes_remaining > 0) {
3296 MEMORY_BASIC_INFORMATION alloc_info;
3297 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3298 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3299 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3300 PAGE_READWRITE) == NULL) {
3301 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3302 exec);)
3303 return false;
3304 }
3305 if (exec) {
3306 DWORD oldprot;
3307 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3308 PAGE_EXECUTE_READWRITE, &oldprot)) {
3309 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3310 exec);)
3311 return false;
3312 }
3313 }
3314 bytes_remaining -= bytes_to_rq;
3315 next_alloc_addr += bytes_to_rq;
3316 }
3317 }
3318 // if we made it this far, return true
3319 return true;
3320 }
3321
3322 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3323 bool exec) {
3324 // alignment_hint is ignored on this OS
3325 return pd_commit_memory(addr, size, exec);
3326 }
3327
3328 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3329 const char* mesg) {
3330 assert(mesg != NULL, "mesg must be specified");
3331 if (!pd_commit_memory(addr, size, exec)) {
3332 warn_fail_commit_memory(addr, size, exec);
3333 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3334 }
3335 }
3336
3337 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3338 size_t alignment_hint, bool exec,
3339 const char* mesg) {
3340 // alignment_hint is ignored on this OS
3341 pd_commit_memory_or_exit(addr, size, exec, mesg);
3342 }
3343
3344 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3345 if (bytes == 0) {
3346 // Don't bother the OS with noops.
3347 return true;
3348 }
3349 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3350 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3351 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3352 }
3353
3354 bool os::pd_release_memory(char* addr, size_t bytes) {
3355 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3356 }
3357
3358 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3359 return os::commit_memory(addr, size, !ExecMem);
3360 }
3361
3362 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3363 return os::uncommit_memory(addr, size);
3364 }
3365
3366 // Set protections specified
3367 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3368 bool is_committed) {
3369 unsigned int p = 0;
3370 switch (prot) {
3371 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3372 case MEM_PROT_READ: p = PAGE_READONLY; break;
3373 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3374 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3375 default:
3376 ShouldNotReachHere();
3377 }
3378
3379 DWORD old_status;
3380
3381 // Strange enough, but on Win32 one can change protection only for committed
3382 // memory, not a big deal anyway, as bytes less or equal than 64K
3383 if (!is_committed) {
3384 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3385 "cannot commit protection page");
3386 }
3387 // One cannot use os::guard_memory() here, as on Win32 guard page
3388 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3389 //
3390 // Pages in the region become guard pages. Any attempt to access a guard page
3391 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3392 // the guard page status. Guard pages thus act as a one-time access alarm.
3393 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3394 }
3395
3396 bool os::guard_memory(char* addr, size_t bytes) {
3397 DWORD old_status;
3398 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3399 }
3400
3401 bool os::unguard_memory(char* addr, size_t bytes) {
3402 DWORD old_status;
3403 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3404 }
3405
3406 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3407 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3408 void os::numa_make_global(char *addr, size_t bytes) { }
3409 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3410 bool os::numa_topology_changed() { return false; }
3411 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3412 int os::numa_get_group_id() { return 0; }
3413 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3414 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3415 // Provide an answer for UMA systems
3416 ids[0] = 0;
3417 return 1;
3418 } else {
3419 // check for size bigger than actual groups_num
3420 size = MIN2(size, numa_get_groups_num());
3421 for (int i = 0; i < (int)size; i++) {
3422 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3423 }
3424 return size;
3425 }
3426 }
3427
3428 bool os::get_page_info(char *start, page_info* info) {
3429 return false;
3430 }
3431
3432 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3433 page_info* page_found) {
3434 return end;
3435 }
3436
3437 char* os::non_memory_address_word() {
3438 // Must never look like an address returned by reserve_memory,
3439 // even in its subfields (as defined by the CPU immediate fields,
3440 // if the CPU splits constants across multiple instructions).
3441 return (char*)-1;
3442 }
3443
3444 #define MAX_ERROR_COUNT 100
3445 #define SYS_THREAD_ERROR 0xffffffffUL
3446
3447 void os::pd_start_thread(Thread* thread) {
3448 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3449 // Returns previous suspend state:
3450 // 0: Thread was not suspended
3451 // 1: Thread is running now
3452 // >1: Thread is still suspended.
3453 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3454 }
3455
3456 class HighResolutionInterval : public CHeapObj<mtThread> {
3457 // The default timer resolution seems to be 10 milliseconds.
3458 // (Where is this written down?)
3459 // If someone wants to sleep for only a fraction of the default,
3460 // then we set the timer resolution down to 1 millisecond for
3461 // the duration of their interval.
3462 // We carefully set the resolution back, since otherwise we
3463 // seem to incur an overhead (3%?) that we don't need.
3464 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3465 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3466 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3467 // timeBeginPeriod() if the relative error exceeded some threshold.
3468 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3469 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3470 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3471 // resolution timers running.
3472 private:
3473 jlong resolution;
3474 public:
3475 HighResolutionInterval(jlong ms) {
3476 resolution = ms % 10L;
3477 if (resolution != 0) {
3478 MMRESULT result = timeBeginPeriod(1L);
3479 }
3480 }
3481 ~HighResolutionInterval() {
3482 if (resolution != 0) {
3483 MMRESULT result = timeEndPeriod(1L);
3484 }
3485 resolution = 0L;
3486 }
3487 };
3488
3489 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3490 jlong limit = (jlong) MAXDWORD;
3491
3492 while (ms > limit) {
3493 int res;
3494 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3495 return res;
3496 }
3497 ms -= limit;
3498 }
3499
3500 assert(thread == Thread::current(), "thread consistency check");
3501 OSThread* osthread = thread->osthread();
3502 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3503 int result;
3504 if (interruptable) {
3505 assert(thread->is_Java_thread(), "must be java thread");
3506 JavaThread *jt = (JavaThread *) thread;
3507 ThreadBlockInVM tbivm(jt);
3508
3509 jt->set_suspend_equivalent();
3510 // cleared by handle_special_suspend_equivalent_condition() or
3511 // java_suspend_self() via check_and_wait_while_suspended()
3512
3513 HANDLE events[1];
3514 events[0] = osthread->interrupt_event();
3515 HighResolutionInterval *phri=NULL;
3516 if (!ForceTimeHighResolution) {
3517 phri = new HighResolutionInterval(ms);
3518 }
3519 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3520 result = OS_TIMEOUT;
3521 } else {
3522 ResetEvent(osthread->interrupt_event());
3523 osthread->set_interrupted(false);
3524 result = OS_INTRPT;
3525 }
3526 delete phri; //if it is NULL, harmless
3527
3528 // were we externally suspended while we were waiting?
3529 jt->check_and_wait_while_suspended();
3530 } else {
3531 assert(!thread->is_Java_thread(), "must not be java thread");
3532 Sleep((long) ms);
3533 result = OS_TIMEOUT;
3534 }
3535 return result;
3536 }
3537
3538 // Short sleep, direct OS call.
3539 //
3540 // ms = 0, means allow others (if any) to run.
3541 //
3542 void os::naked_short_sleep(jlong ms) {
3543 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3544 Sleep(ms);
3545 }
3546
3547 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3548 void os::infinite_sleep() {
3549 while (true) { // sleep forever ...
3550 Sleep(100000); // ... 100 seconds at a time
3551 }
3552 }
3553
3554 typedef BOOL (WINAPI * STTSignature)(void);
3555
3556 void os::naked_yield() {
3557 // Use either SwitchToThread() or Sleep(0)
3558 // Consider passing back the return value from SwitchToThread().
3559 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3560 SwitchToThread();
3561 } else {
3562 Sleep(0);
3563 }
3564 }
3565
3566 // Win32 only gives you access to seven real priorities at a time,
3567 // so we compress Java's ten down to seven. It would be better
3568 // if we dynamically adjusted relative priorities.
3569
3570 int os::java_to_os_priority[CriticalPriority + 1] = {
3571 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3572 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3573 THREAD_PRIORITY_LOWEST, // 2
3574 THREAD_PRIORITY_BELOW_NORMAL, // 3
3575 THREAD_PRIORITY_BELOW_NORMAL, // 4
3576 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3577 THREAD_PRIORITY_NORMAL, // 6
3578 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3579 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3580 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3581 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3582 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3583 };
3584
3585 int prio_policy1[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_ABOVE_NORMAL, // 6
3593 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3594 THREAD_PRIORITY_HIGHEST, // 8
3595 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3596 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3597 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3598 };
3599
3600 static int prio_init() {
3601 // If ThreadPriorityPolicy is 1, switch tables
3602 if (ThreadPriorityPolicy == 1) {
3603 int i;
3604 for (i = 0; i < CriticalPriority + 1; i++) {
3605 os::java_to_os_priority[i] = prio_policy1[i];
3606 }
3607 }
3608 if (UseCriticalJavaThreadPriority) {
3609 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3610 }
3611 return 0;
3612 }
3613
3614 OSReturn os::set_native_priority(Thread* thread, int priority) {
3615 if (!UseThreadPriorities) return OS_OK;
3616 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3617 return ret ? OS_OK : OS_ERR;
3618 }
3619
3620 OSReturn os::get_native_priority(const Thread* const thread,
3621 int* priority_ptr) {
3622 if (!UseThreadPriorities) {
3623 *priority_ptr = java_to_os_priority[NormPriority];
3624 return OS_OK;
3625 }
3626 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3627 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3628 assert(false, "GetThreadPriority failed");
3629 return OS_ERR;
3630 }
3631 *priority_ptr = os_prio;
3632 return OS_OK;
3633 }
3634
3635
3636 // Hint to the underlying OS that a task switch would not be good.
3637 // Void return because it's a hint and can fail.
3638 void os::hint_no_preempt() {}
3639
3640 void os::interrupt(Thread* thread) {
3641 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3642 Threads_lock->owned_by_self(),
3643 "possibility of dangling Thread pointer");
3644
3645 OSThread* osthread = thread->osthread();
3646 osthread->set_interrupted(true);
3647 // More than one thread can get here with the same value of osthread,
3648 // resulting in multiple notifications. We do, however, want the store
3649 // to interrupted() to be visible to other threads before we post
3650 // the interrupt event.
3651 OrderAccess::release();
3652 SetEvent(osthread->interrupt_event());
3653 // For JSR166: unpark after setting status
3654 if (thread->is_Java_thread()) {
3655 ((JavaThread*)thread)->parker()->unpark();
3656 }
3657
3658 ParkEvent * ev = thread->_ParkEvent;
3659 if (ev != NULL) ev->unpark();
3660 }
3661
3662
3663 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3664 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3665 "possibility of dangling Thread pointer");
3666
3667 OSThread* osthread = thread->osthread();
3668 // There is no synchronization between the setting of the interrupt
3669 // and it being cleared here. It is critical - see 6535709 - that
3670 // we only clear the interrupt state, and reset the interrupt event,
3671 // if we are going to report that we were indeed interrupted - else
3672 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3673 // depending on the timing. By checking thread interrupt event to see
3674 // if the thread gets real interrupt thus prevent spurious wakeup.
3675 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3676 if (interrupted && clear_interrupted) {
3677 osthread->set_interrupted(false);
3678 ResetEvent(osthread->interrupt_event());
3679 } // Otherwise leave the interrupted state alone
3680
3681 return interrupted;
3682 }
3683
3684 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3685 ExtendedPC os::get_thread_pc(Thread* thread) {
3686 CONTEXT context;
3687 context.ContextFlags = CONTEXT_CONTROL;
3688 HANDLE handle = thread->osthread()->thread_handle();
3689 #ifdef _M_IA64
3690 assert(0, "Fix get_thread_pc");
3691 return ExtendedPC(NULL);
3692 #else
3693 if (GetThreadContext(handle, &context)) {
3694 #ifdef _M_AMD64
3695 return ExtendedPC((address) context.Rip);
3696 #else
3697 return ExtendedPC((address) context.Eip);
3698 #endif
3699 } else {
3700 return ExtendedPC(NULL);
3701 }
3702 #endif
3703 }
3704
3705 // GetCurrentThreadId() returns DWORD
3706 intx os::current_thread_id() { return GetCurrentThreadId(); }
3707
3708 static int _initial_pid = 0;
3709
3710 int os::current_process_id() {
3711 return (_initial_pid ? _initial_pid : _getpid());
3712 }
3713
3714 int os::win32::_vm_page_size = 0;
3715 int os::win32::_vm_allocation_granularity = 0;
3716 int os::win32::_processor_type = 0;
3717 // Processor level is not available on non-NT systems, use vm_version instead
3718 int os::win32::_processor_level = 0;
3719 julong os::win32::_physical_memory = 0;
3720 size_t os::win32::_default_stack_size = 0;
3721
3722 intx os::win32::_os_thread_limit = 0;
3723 volatile intx os::win32::_os_thread_count = 0;
3724
3725 bool os::win32::_is_nt = false;
3726 bool os::win32::_is_windows_2003 = false;
3727 bool os::win32::_is_windows_server = false;
3728
3729 // 6573254
3730 // Currently, the bug is observed across all the supported Windows releases,
3731 // including the latest one (as of this writing - Windows Server 2012 R2)
3732 bool os::win32::_has_exit_bug = true;
3733 bool os::win32::_has_performance_count = 0;
3734
3735 void os::win32::initialize_system_info() {
3736 SYSTEM_INFO si;
3737 GetSystemInfo(&si);
3738 _vm_page_size = si.dwPageSize;
3739 _vm_allocation_granularity = si.dwAllocationGranularity;
3740 _processor_type = si.dwProcessorType;
3741 _processor_level = si.wProcessorLevel;
3742 set_processor_count(si.dwNumberOfProcessors);
3743
3744 MEMORYSTATUSEX ms;
3745 ms.dwLength = sizeof(ms);
3746
3747 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3748 // dwMemoryLoad (% of memory in use)
3749 GlobalMemoryStatusEx(&ms);
3750 _physical_memory = ms.ullTotalPhys;
3751
3752 OSVERSIONINFOEX oi;
3753 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3754 GetVersionEx((OSVERSIONINFO*)&oi);
3755 switch (oi.dwPlatformId) {
3756 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3757 case VER_PLATFORM_WIN32_NT:
3758 _is_nt = true;
3759 {
3760 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3761 if (os_vers == 5002) {
3762 _is_windows_2003 = true;
3763 }
3764 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3765 oi.wProductType == VER_NT_SERVER) {
3766 _is_windows_server = true;
3767 }
3768 }
3769 break;
3770 default: fatal("Unknown platform");
3771 }
3772
3773 _default_stack_size = os::current_stack_size();
3774 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3775 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3776 "stack size not a multiple of page size");
3777
3778 initialize_performance_counter();
3779 }
3780
3781
3782 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3783 int ebuflen) {
3784 char path[MAX_PATH];
3785 DWORD size;
3786 DWORD pathLen = (DWORD)sizeof(path);
3787 HINSTANCE result = NULL;
3788
3789 // only allow library name without path component
3790 assert(strchr(name, '\\') == NULL, "path not allowed");
3791 assert(strchr(name, ':') == NULL, "path not allowed");
3792 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3793 jio_snprintf(ebuf, ebuflen,
3794 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3795 return NULL;
3796 }
3797
3798 // search system directory
3799 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3800 if (size >= pathLen) {
3801 return NULL; // truncated
3802 }
3803 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3804 return NULL; // truncated
3805 }
3806 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3807 return result;
3808 }
3809 }
3810
3811 // try Windows directory
3812 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3813 if (size >= pathLen) {
3814 return NULL; // truncated
3815 }
3816 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3817 return NULL; // truncated
3818 }
3819 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3820 return result;
3821 }
3822 }
3823
3824 jio_snprintf(ebuf, ebuflen,
3825 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3826 return NULL;
3827 }
3828
3829 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3830
3831 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3832 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3833 return TRUE;
3834 }
3835
3836 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3837 // Basic approach:
3838 // - Each exiting thread registers its intent to exit and then does so.
3839 // - A thread trying to terminate the process must wait for all
3840 // threads currently exiting to complete their exit.
3841
3842 if (os::win32::has_exit_bug()) {
3843 // The array holds handles of the threads that have started exiting by calling
3844 // _endthreadex().
3845 // Should be large enough to avoid blocking the exiting thread due to lack of
3846 // a free slot.
3847 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3848 static int handle_count = 0;
3849
3850 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3851 static CRITICAL_SECTION crit_sect;
3852 static volatile jint process_exiting = 0;
3853 int i, j;
3854 DWORD res;
3855 HANDLE hproc, hthr;
3856
3857 // The first thread that reached this point, initializes the critical section.
3858 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3859 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3860 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3861 EnterCriticalSection(&crit_sect);
3862
3863 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3864 // Remove from the array those handles of the threads that have completed exiting.
3865 for (i = 0, j = 0; i < handle_count; ++i) {
3866 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3867 if (res == WAIT_TIMEOUT) {
3868 handles[j++] = handles[i];
3869 } else {
3870 if (res == WAIT_FAILED) {
3871 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3872 GetLastError(), __FILE__, __LINE__);
3873 }
3874 // Don't keep the handle, if we failed waiting for it.
3875 CloseHandle(handles[i]);
3876 }
3877 }
3878
3879 // If there's no free slot in the array of the kept handles, we'll have to
3880 // wait until at least one thread completes exiting.
3881 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3882 // Raise the priority of the oldest exiting thread to increase its chances
3883 // to complete sooner.
3884 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3885 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3886 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3887 i = (res - WAIT_OBJECT_0);
3888 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3889 for (; i < handle_count; ++i) {
3890 handles[i] = handles[i + 1];
3891 }
3892 } else {
3893 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3894 (res == WAIT_FAILED ? "failed" : "timed out"),
3895 GetLastError(), __FILE__, __LINE__);
3896 // Don't keep handles, if we failed waiting for them.
3897 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3898 CloseHandle(handles[i]);
3899 }
3900 handle_count = 0;
3901 }
3902 }
3903
3904 // Store a duplicate of the current thread handle in the array of handles.
3905 hproc = GetCurrentProcess();
3906 hthr = GetCurrentThread();
3907 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3908 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3909 warning("DuplicateHandle failed (%u) in %s: %d\n",
3910 GetLastError(), __FILE__, __LINE__);
3911 } else {
3912 ++handle_count;
3913 }
3914
3915 // The current exiting thread has stored its handle in the array, and now
3916 // should leave the critical section before calling _endthreadex().
3917
3918 } else if (what != EPT_THREAD) {
3919 if (handle_count > 0) {
3920 // Before ending the process, make sure all the threads that had called
3921 // _endthreadex() completed.
3922
3923 // Set the priority level of the current thread to the same value as
3924 // the priority level of exiting threads.
3925 // This is to ensure it will be given a fair chance to execute if
3926 // the timeout expires.
3927 hthr = GetCurrentThread();
3928 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3929 for (i = 0; i < handle_count; ++i) {
3930 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3931 }
3932 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3933 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3934 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3935 (res == WAIT_FAILED ? "failed" : "timed out"),
3936 GetLastError(), __FILE__, __LINE__);
3937 }
3938 for (i = 0; i < handle_count; ++i) {
3939 CloseHandle(handles[i]);
3940 }
3941 handle_count = 0;
3942 }
3943
3944 OrderAccess::release_store(&process_exiting, 1);
3945 }
3946
3947 LeaveCriticalSection(&crit_sect);
3948 }
3949
3950 if (what == EPT_THREAD) {
3951 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3952 // Some other thread is about to call exit(), so we
3953 // don't let the current thread proceed to _endthreadex()
3954 SuspendThread(GetCurrentThread());
3955 // Avoid busy-wait loop, if SuspendThread() failed.
3956 Sleep(EXIT_TIMEOUT);
3957 }
3958 }
3959 }
3960
3961 // We are here if either
3962 // - there's no 'race at exit' bug on this OS release;
3963 // - initialization of the critical section failed (unlikely);
3964 // - the current thread has stored its handle and left the critical section;
3965 // - the process-exiting thread has raised the flag and left the critical section.
3966 if (what == EPT_THREAD) {
3967 _endthreadex((unsigned)exit_code);
3968 } else if (what == EPT_PROCESS) {
3969 ::exit(exit_code);
3970 } else {
3971 _exit(exit_code);
3972 }
3973
3974 // Should not reach here
3975 return exit_code;
3976 }
3977
3978 #undef EXIT_TIMEOUT
3979
3980 void os::win32::setmode_streams() {
3981 _setmode(_fileno(stdin), _O_BINARY);
3982 _setmode(_fileno(stdout), _O_BINARY);
3983 _setmode(_fileno(stderr), _O_BINARY);
3984 }
3985
3986
3987 bool os::is_debugger_attached() {
3988 return IsDebuggerPresent() ? true : false;
3989 }
3990
3991
3992 void os::wait_for_keypress_at_exit(void) {
3993 if (PauseAtExit) {
3994 fprintf(stderr, "Press any key to continue...\n");
3995 fgetc(stdin);
3996 }
3997 }
3998
3999
4000 int os::message_box(const char* title, const char* message) {
4001 int result = MessageBox(NULL, message, title,
4002 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4003 return result == IDYES;
4004 }
4005
4006 int os::allocate_thread_local_storage() {
4007 return TlsAlloc();
4008 }
4009
4010
4011 void os::free_thread_local_storage(int index) {
4012 TlsFree(index);
4013 }
4014
4015
4016 void os::thread_local_storage_at_put(int index, void* value) {
4017 TlsSetValue(index, value);
4018 assert(thread_local_storage_at(index) == value, "Just checking");
4019 }
4020
4021
4022 void* os::thread_local_storage_at(int index) {
4023 return TlsGetValue(index);
4024 }
4025
4026
4027 #ifndef PRODUCT
4028 #ifndef _WIN64
4029 // Helpers to check whether NX protection is enabled
4030 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4031 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4032 pex->ExceptionRecord->NumberParameters > 0 &&
4033 pex->ExceptionRecord->ExceptionInformation[0] ==
4034 EXCEPTION_INFO_EXEC_VIOLATION) {
4035 return EXCEPTION_EXECUTE_HANDLER;
4036 }
4037 return EXCEPTION_CONTINUE_SEARCH;
4038 }
4039
4040 void nx_check_protection() {
4041 // If NX is enabled we'll get an exception calling into code on the stack
4042 char code[] = { (char)0xC3 }; // ret
4043 void *code_ptr = (void *)code;
4044 __try {
4045 __asm call code_ptr
4046 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4047 tty->print_raw_cr("NX protection detected.");
4048 }
4049 }
4050 #endif // _WIN64
4051 #endif // PRODUCT
4052
4053 // this is called _before_ the global arguments have been parsed
4054 void os::init(void) {
4055 _initial_pid = _getpid();
4056
4057 init_random(1234567);
4058
4059 win32::initialize_system_info();
4060 win32::setmode_streams();
4061 init_page_sizes((size_t) win32::vm_page_size());
4062
4063 // This may be overridden later when argument processing is done.
4064 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4065 os::win32::is_windows_2003());
4066
4067 // Initialize main_process and main_thread
4068 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4069 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4070 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4071 fatal("DuplicateHandle failed\n");
4072 }
4073 main_thread_id = (int) GetCurrentThreadId();
4074 }
4075
4076 // To install functions for atexit processing
4077 extern "C" {
4078 static void perfMemory_exit_helper() {
4079 perfMemory_exit();
4080 }
4081 }
4082
4083 static jint initSock();
4084
4085 // this is called _after_ the global arguments have been parsed
4086 jint os::init_2(void) {
4087 // Allocate a single page and mark it as readable for safepoint polling
4088 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4089 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4090
4091 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4092 guarantee(return_page != NULL, "Commit Failed for polling page");
4093
4094 os::set_polling_page(polling_page);
4095
4096 #ifndef PRODUCT
4097 if (Verbose && PrintMiscellaneous) {
4098 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4099 (intptr_t)polling_page);
4100 }
4101 #endif
4102
4103 if (!UseMembar) {
4104 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4105 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4106
4107 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4108 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4109
4110 os::set_memory_serialize_page(mem_serialize_page);
4111
4112 #ifndef PRODUCT
4113 if (Verbose && PrintMiscellaneous) {
4114 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4115 (intptr_t)mem_serialize_page);
4116 }
4117 #endif
4118 }
4119
4120 // Setup Windows Exceptions
4121
4122 // for debugging float code generation bugs
4123 if (ForceFloatExceptions) {
4124 #ifndef _WIN64
4125 static long fp_control_word = 0;
4126 __asm { fstcw fp_control_word }
4127 // see Intel PPro Manual, Vol. 2, p 7-16
4128 const long precision = 0x20;
4129 const long underflow = 0x10;
4130 const long overflow = 0x08;
4131 const long zero_div = 0x04;
4132 const long denorm = 0x02;
4133 const long invalid = 0x01;
4134 fp_control_word |= invalid;
4135 __asm { fldcw fp_control_word }
4136 #endif
4137 }
4138
4139 // If stack_commit_size is 0, windows will reserve the default size,
4140 // but only commit a small portion of it.
4141 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4142 size_t default_reserve_size = os::win32::default_stack_size();
4143 size_t actual_reserve_size = stack_commit_size;
4144 if (stack_commit_size < default_reserve_size) {
4145 // If stack_commit_size == 0, we want this too
4146 actual_reserve_size = default_reserve_size;
4147 }
4148
4149 // Check minimum allowable stack size for thread creation and to initialize
4150 // the java system classes, including StackOverflowError - depends on page
4151 // size. Add a page for compiler2 recursion in main thread.
4152 // Add in 2*BytesPerWord times page size to account for VM stack during
4153 // class initialization depending on 32 or 64 bit VM.
4154 size_t min_stack_allowed =
4155 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4156 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4157 if (actual_reserve_size < min_stack_allowed) {
4158 tty->print_cr("\nThe stack size specified is too small, "
4159 "Specify at least %dk",
4160 min_stack_allowed / K);
4161 return JNI_ERR;
4162 }
4163
4164 JavaThread::set_stack_size_at_create(stack_commit_size);
4165
4166 // Calculate theoretical max. size of Threads to guard gainst artifical
4167 // out-of-memory situations, where all available address-space has been
4168 // reserved by thread stacks.
4169 assert(actual_reserve_size != 0, "Must have a stack");
4170
4171 // Calculate the thread limit when we should start doing Virtual Memory
4172 // banging. Currently when the threads will have used all but 200Mb of space.
4173 //
4174 // TODO: consider performing a similar calculation for commit size instead
4175 // as reserve size, since on a 64-bit platform we'll run into that more
4176 // often than running out of virtual memory space. We can use the
4177 // lower value of the two calculations as the os_thread_limit.
4178 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4179 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4180
4181 // at exit methods are called in the reverse order of their registration.
4182 // there is no limit to the number of functions registered. atexit does
4183 // not set errno.
4184
4185 if (PerfAllowAtExitRegistration) {
4186 // only register atexit functions if PerfAllowAtExitRegistration is set.
4187 // atexit functions can be delayed until process exit time, which
4188 // can be problematic for embedded VM situations. Embedded VMs should
4189 // call DestroyJavaVM() to assure that VM resources are released.
4190
4191 // note: perfMemory_exit_helper atexit function may be removed in
4192 // the future if the appropriate cleanup code can be added to the
4193 // VM_Exit VMOperation's doit method.
4194 if (atexit(perfMemory_exit_helper) != 0) {
4195 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4196 }
4197 }
4198
4199 #ifndef _WIN64
4200 // Print something if NX is enabled (win32 on AMD64)
4201 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4202 #endif
4203
4204 // initialize thread priority policy
4205 prio_init();
4206
4207 if (UseNUMA && !ForceNUMA) {
4208 UseNUMA = false; // We don't fully support this yet
4209 }
4210
4211 if (UseNUMAInterleaving) {
4212 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4213 bool success = numa_interleaving_init();
4214 if (!success) UseNUMAInterleaving = false;
4215 }
4216
4217 if (initSock() != JNI_OK) {
4218 return JNI_ERR;
4219 }
4220
4221 return JNI_OK;
4222 }
4223
4224 // Mark the polling page as unreadable
4225 void os::make_polling_page_unreadable(void) {
4226 DWORD old_status;
4227 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4228 PAGE_NOACCESS, &old_status)) {
4229 fatal("Could not disable polling page");
4230 }
4231 }
4232
4233 // Mark the polling page as readable
4234 void os::make_polling_page_readable(void) {
4235 DWORD old_status;
4236 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4237 PAGE_READONLY, &old_status)) {
4238 fatal("Could not enable polling page");
4239 }
4240 }
4241
4242
4243 int os::stat(const char *path, struct stat *sbuf) {
4244 char pathbuf[MAX_PATH];
4245 if (strlen(path) > MAX_PATH - 1) {
4246 errno = ENAMETOOLONG;
4247 return -1;
4248 }
4249 os::native_path(strcpy(pathbuf, path));
4250 int ret = ::stat(pathbuf, sbuf);
4251 if (sbuf != NULL && UseUTCFileTimestamp) {
4252 // Fix for 6539723. st_mtime returned from stat() is dependent on
4253 // the system timezone and so can return different values for the
4254 // same file if/when daylight savings time changes. This adjustment
4255 // makes sure the same timestamp is returned regardless of the TZ.
4256 //
4257 // See:
4258 // http://msdn.microsoft.com/library/
4259 // default.asp?url=/library/en-us/sysinfo/base/
4260 // time_zone_information_str.asp
4261 // and
4262 // http://msdn.microsoft.com/library/default.asp?url=
4263 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4264 //
4265 // NOTE: there is a insidious bug here: If the timezone is changed
4266 // after the call to stat() but before 'GetTimeZoneInformation()', then
4267 // the adjustment we do here will be wrong and we'll return the wrong
4268 // value (which will likely end up creating an invalid class data
4269 // archive). Absent a better API for this, or some time zone locking
4270 // mechanism, we'll have to live with this risk.
4271 TIME_ZONE_INFORMATION tz;
4272 DWORD tzid = GetTimeZoneInformation(&tz);
4273 int daylightBias =
4274 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4275 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4276 }
4277 return ret;
4278 }
4279
4280
4281 #define FT2INT64(ft) \
4282 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4283
4284
4285 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4286 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4287 // of a thread.
4288 //
4289 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4290 // the fast estimate available on the platform.
4291
4292 // current_thread_cpu_time() is not optimized for Windows yet
4293 jlong os::current_thread_cpu_time() {
4294 // return user + sys since the cost is the same
4295 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4296 }
4297
4298 jlong os::thread_cpu_time(Thread* thread) {
4299 // consistent with what current_thread_cpu_time() returns.
4300 return os::thread_cpu_time(thread, true /* user+sys */);
4301 }
4302
4303 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4304 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4305 }
4306
4307 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4308 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4309 // If this function changes, os::is_thread_cpu_time_supported() should too
4310 if (os::win32::is_nt()) {
4311 FILETIME CreationTime;
4312 FILETIME ExitTime;
4313 FILETIME KernelTime;
4314 FILETIME UserTime;
4315
4316 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4317 &ExitTime, &KernelTime, &UserTime) == 0) {
4318 return -1;
4319 } else if (user_sys_cpu_time) {
4320 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4321 } else {
4322 return FT2INT64(UserTime) * 100;
4323 }
4324 } else {
4325 return (jlong) timeGetTime() * 1000000;
4326 }
4327 }
4328
4329 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4330 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4331 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4332 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4333 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4334 }
4335
4336 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4337 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4338 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4339 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4340 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4341 }
4342
4343 bool os::is_thread_cpu_time_supported() {
4344 // see os::thread_cpu_time
4345 if (os::win32::is_nt()) {
4346 FILETIME CreationTime;
4347 FILETIME ExitTime;
4348 FILETIME KernelTime;
4349 FILETIME UserTime;
4350
4351 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4352 &KernelTime, &UserTime) == 0) {
4353 return false;
4354 } else {
4355 return true;
4356 }
4357 } else {
4358 return false;
4359 }
4360 }
4361
4362 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4363 // It does have primitives (PDH API) to get CPU usage and run queue length.
4364 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4365 // If we wanted to implement loadavg on Windows, we have a few options:
4366 //
4367 // a) Query CPU usage and run queue length and "fake" an answer by
4368 // returning the CPU usage if it's under 100%, and the run queue
4369 // length otherwise. It turns out that querying is pretty slow
4370 // on Windows, on the order of 200 microseconds on a fast machine.
4371 // Note that on the Windows the CPU usage value is the % usage
4372 // since the last time the API was called (and the first call
4373 // returns 100%), so we'd have to deal with that as well.
4374 //
4375 // b) Sample the "fake" answer using a sampling thread and store
4376 // the answer in a global variable. The call to loadavg would
4377 // just return the value of the global, avoiding the slow query.
4378 //
4379 // c) Sample a better answer using exponential decay to smooth the
4380 // value. This is basically the algorithm used by UNIX kernels.
4381 //
4382 // Note that sampling thread starvation could affect both (b) and (c).
4383 int os::loadavg(double loadavg[], int nelem) {
4384 return -1;
4385 }
4386
4387
4388 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4389 bool os::dont_yield() {
4390 return DontYieldALot;
4391 }
4392
4393 // This method is a slightly reworked copy of JDK's sysOpen
4394 // from src/windows/hpi/src/sys_api_md.c
4395
4396 int os::open(const char *path, int oflag, int mode) {
4397 char pathbuf[MAX_PATH];
4398
4399 if (strlen(path) > MAX_PATH - 1) {
4400 errno = ENAMETOOLONG;
4401 return -1;
4402 }
4403 os::native_path(strcpy(pathbuf, path));
4404 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4405 }
4406
4407 FILE* os::open(int fd, const char* mode) {
4408 return ::_fdopen(fd, mode);
4409 }
4410
4411 // Is a (classpath) directory empty?
4412 bool os::dir_is_empty(const char* path) {
4413 WIN32_FIND_DATA fd;
4414 HANDLE f = FindFirstFile(path, &fd);
4415 if (f == INVALID_HANDLE_VALUE) {
4416 return true;
4417 }
4418 FindClose(f);
4419 return false;
4420 }
4421
4422 // create binary file, rewriting existing file if required
4423 int os::create_binary_file(const char* path, bool rewrite_existing) {
4424 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4425 if (!rewrite_existing) {
4426 oflags |= _O_EXCL;
4427 }
4428 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4429 }
4430
4431 // return current position of file pointer
4432 jlong os::current_file_offset(int fd) {
4433 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4434 }
4435
4436 // move file pointer to the specified offset
4437 jlong os::seek_to_file_offset(int fd, jlong offset) {
4438 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4439 }
4440
4441
4442 jlong os::lseek(int fd, jlong offset, int whence) {
4443 return (jlong) ::_lseeki64(fd, offset, whence);
4444 }
4445
4446 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4447 OVERLAPPED ov;
4448 DWORD nread;
4449 BOOL result;
4450
4451 ZeroMemory(&ov, sizeof(ov));
4452 ov.Offset = (DWORD)offset;
4453 ov.OffsetHigh = (DWORD)(offset >> 32);
4454
4455 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4456
4457 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4458
4459 return result ? nread : 0;
4460 }
4461
4462
4463 // This method is a slightly reworked copy of JDK's sysNativePath
4464 // from src/windows/hpi/src/path_md.c
4465
4466 // Convert a pathname to native format. On win32, this involves forcing all
4467 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4468 // sometimes rejects '/') and removing redundant separators. The input path is
4469 // assumed to have been converted into the character encoding used by the local
4470 // system. Because this might be a double-byte encoding, care is taken to
4471 // treat double-byte lead characters correctly.
4472 //
4473 // This procedure modifies the given path in place, as the result is never
4474 // longer than the original. There is no error return; this operation always
4475 // succeeds.
4476 char * os::native_path(char *path) {
4477 char *src = path, *dst = path, *end = path;
4478 char *colon = NULL; // If a drive specifier is found, this will
4479 // point to the colon following the drive letter
4480
4481 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4482 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4483 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4484
4485 // Check for leading separators
4486 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4487 while (isfilesep(*src)) {
4488 src++;
4489 }
4490
4491 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4492 // Remove leading separators if followed by drive specifier. This
4493 // hack is necessary to support file URLs containing drive
4494 // specifiers (e.g., "file://c:/path"). As a side effect,
4495 // "/c:/path" can be used as an alternative to "c:/path".
4496 *dst++ = *src++;
4497 colon = dst;
4498 *dst++ = ':';
4499 src++;
4500 } else {
4501 src = path;
4502 if (isfilesep(src[0]) && isfilesep(src[1])) {
4503 // UNC pathname: Retain first separator; leave src pointed at
4504 // second separator so that further separators will be collapsed
4505 // into the second separator. The result will be a pathname
4506 // beginning with "\\\\" followed (most likely) by a host name.
4507 src = dst = path + 1;
4508 path[0] = '\\'; // Force first separator to '\\'
4509 }
4510 }
4511
4512 end = dst;
4513
4514 // Remove redundant separators from remainder of path, forcing all
4515 // separators to be '\\' rather than '/'. Also, single byte space
4516 // characters are removed from the end of the path because those
4517 // are not legal ending characters on this operating system.
4518 //
4519 while (*src != '\0') {
4520 if (isfilesep(*src)) {
4521 *dst++ = '\\'; src++;
4522 while (isfilesep(*src)) src++;
4523 if (*src == '\0') {
4524 // Check for trailing separator
4525 end = dst;
4526 if (colon == dst - 2) break; // "z:\\"
4527 if (dst == path + 1) break; // "\\"
4528 if (dst == path + 2 && isfilesep(path[0])) {
4529 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4530 // beginning of a UNC pathname. Even though it is not, by
4531 // itself, a valid UNC pathname, we leave it as is in order
4532 // to be consistent with the path canonicalizer as well
4533 // as the win32 APIs, which treat this case as an invalid
4534 // UNC pathname rather than as an alias for the root
4535 // directory of the current drive.
4536 break;
4537 }
4538 end = --dst; // Path does not denote a root directory, so
4539 // remove trailing separator
4540 break;
4541 }
4542 end = dst;
4543 } else {
4544 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4545 *dst++ = *src++;
4546 if (*src) *dst++ = *src++;
4547 end = dst;
4548 } else { // Copy a single-byte character
4549 char c = *src++;
4550 *dst++ = c;
4551 // Space is not a legal ending character
4552 if (c != ' ') end = dst;
4553 }
4554 }
4555 }
4556
4557 *end = '\0';
4558
4559 // For "z:", add "." to work around a bug in the C runtime library
4560 if (colon == dst - 1) {
4561 path[2] = '.';
4562 path[3] = '\0';
4563 }
4564
4565 return path;
4566 }
4567
4568 // This code is a copy of JDK's sysSetLength
4569 // from src/windows/hpi/src/sys_api_md.c
4570
4571 int os::ftruncate(int fd, jlong length) {
4572 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4573 long high = (long)(length >> 32);
4574 DWORD ret;
4575
4576 if (h == (HANDLE)(-1)) {
4577 return -1;
4578 }
4579
4580 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4581 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4582 return -1;
4583 }
4584
4585 if (::SetEndOfFile(h) == FALSE) {
4586 return -1;
4587 }
4588
4589 return 0;
4590 }
4591
4592
4593 // This code is a copy of JDK's sysSync
4594 // from src/windows/hpi/src/sys_api_md.c
4595 // except for the legacy workaround for a bug in Win 98
4596
4597 int os::fsync(int fd) {
4598 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4599
4600 if ((!::FlushFileBuffers(handle)) &&
4601 (GetLastError() != ERROR_ACCESS_DENIED)) {
4602 // from winerror.h
4603 return -1;
4604 }
4605 return 0;
4606 }
4607
4608 static int nonSeekAvailable(int, long *);
4609 static int stdinAvailable(int, long *);
4610
4611 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4612 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4613
4614 // This code is a copy of JDK's sysAvailable
4615 // from src/windows/hpi/src/sys_api_md.c
4616
4617 int os::available(int fd, jlong *bytes) {
4618 jlong cur, end;
4619 struct _stati64 stbuf64;
4620
4621 if (::_fstati64(fd, &stbuf64) >= 0) {
4622 int mode = stbuf64.st_mode;
4623 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4624 int ret;
4625 long lpbytes;
4626 if (fd == 0) {
4627 ret = stdinAvailable(fd, &lpbytes);
4628 } else {
4629 ret = nonSeekAvailable(fd, &lpbytes);
4630 }
4631 (*bytes) = (jlong)(lpbytes);
4632 return ret;
4633 }
4634 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4635 return FALSE;
4636 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4637 return FALSE;
4638 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4639 return FALSE;
4640 }
4641 *bytes = end - cur;
4642 return TRUE;
4643 } else {
4644 return FALSE;
4645 }
4646 }
4647
4648 // This code is a copy of JDK's nonSeekAvailable
4649 // from src/windows/hpi/src/sys_api_md.c
4650
4651 static int nonSeekAvailable(int fd, long *pbytes) {
4652 // This is used for available on non-seekable devices
4653 // (like both named and anonymous pipes, such as pipes
4654 // connected to an exec'd process).
4655 // Standard Input is a special case.
4656 HANDLE han;
4657
4658 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4659 return FALSE;
4660 }
4661
4662 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4663 // PeekNamedPipe fails when at EOF. In that case we
4664 // simply make *pbytes = 0 which is consistent with the
4665 // behavior we get on Solaris when an fd is at EOF.
4666 // The only alternative is to raise an Exception,
4667 // which isn't really warranted.
4668 //
4669 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4670 return FALSE;
4671 }
4672 *pbytes = 0;
4673 }
4674 return TRUE;
4675 }
4676
4677 #define MAX_INPUT_EVENTS 2000
4678
4679 // This code is a copy of JDK's stdinAvailable
4680 // from src/windows/hpi/src/sys_api_md.c
4681
4682 static int stdinAvailable(int fd, long *pbytes) {
4683 HANDLE han;
4684 DWORD numEventsRead = 0; // Number of events read from buffer
4685 DWORD numEvents = 0; // Number of events in buffer
4686 DWORD i = 0; // Loop index
4687 DWORD curLength = 0; // Position marker
4688 DWORD actualLength = 0; // Number of bytes readable
4689 BOOL error = FALSE; // Error holder
4690 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4691
4692 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4693 return FALSE;
4694 }
4695
4696 // Construct an array of input records in the console buffer
4697 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4698 if (error == 0) {
4699 return nonSeekAvailable(fd, pbytes);
4700 }
4701
4702 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4703 if (numEvents > MAX_INPUT_EVENTS) {
4704 numEvents = MAX_INPUT_EVENTS;
4705 }
4706
4707 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4708 if (lpBuffer == NULL) {
4709 return FALSE;
4710 }
4711
4712 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4713 if (error == 0) {
4714 os::free(lpBuffer);
4715 return FALSE;
4716 }
4717
4718 // Examine input records for the number of bytes available
4719 for (i=0; i<numEvents; i++) {
4720 if (lpBuffer[i].EventType == KEY_EVENT) {
4721
4722 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4723 &(lpBuffer[i].Event);
4724 if (keyRecord->bKeyDown == TRUE) {
4725 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4726 curLength++;
4727 if (*keyPressed == '\r') {
4728 actualLength = curLength;
4729 }
4730 }
4731 }
4732 }
4733
4734 if (lpBuffer != NULL) {
4735 os::free(lpBuffer);
4736 }
4737
4738 *pbytes = (long) actualLength;
4739 return TRUE;
4740 }
4741
4742 // Map a block of memory.
4743 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4744 char *addr, size_t bytes, bool read_only,
4745 bool allow_exec) {
4746 HANDLE hFile;
4747 char* base;
4748
4749 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4750 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4751 if (hFile == NULL) {
4752 if (PrintMiscellaneous && Verbose) {
4753 DWORD err = GetLastError();
4754 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4755 }
4756 return NULL;
4757 }
4758
4759 if (allow_exec) {
4760 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4761 // unless it comes from a PE image (which the shared archive is not.)
4762 // Even VirtualProtect refuses to give execute access to mapped memory
4763 // that was not previously executable.
4764 //
4765 // Instead, stick the executable region in anonymous memory. Yuck.
4766 // Penalty is that ~4 pages will not be shareable - in the future
4767 // we might consider DLLizing the shared archive with a proper PE
4768 // header so that mapping executable + sharing is possible.
4769
4770 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4771 PAGE_READWRITE);
4772 if (base == NULL) {
4773 if (PrintMiscellaneous && Verbose) {
4774 DWORD err = GetLastError();
4775 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4776 }
4777 CloseHandle(hFile);
4778 return NULL;
4779 }
4780
4781 DWORD bytes_read;
4782 OVERLAPPED overlapped;
4783 overlapped.Offset = (DWORD)file_offset;
4784 overlapped.OffsetHigh = 0;
4785 overlapped.hEvent = NULL;
4786 // ReadFile guarantees that if the return value is true, the requested
4787 // number of bytes were read before returning.
4788 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4789 if (!res) {
4790 if (PrintMiscellaneous && Verbose) {
4791 DWORD err = GetLastError();
4792 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4793 }
4794 release_memory(base, bytes);
4795 CloseHandle(hFile);
4796 return NULL;
4797 }
4798 } else {
4799 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4800 NULL /* file_name */);
4801 if (hMap == NULL) {
4802 if (PrintMiscellaneous && Verbose) {
4803 DWORD err = GetLastError();
4804 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4805 }
4806 CloseHandle(hFile);
4807 return NULL;
4808 }
4809
4810 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4811 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4812 (DWORD)bytes, addr);
4813 if (base == NULL) {
4814 if (PrintMiscellaneous && Verbose) {
4815 DWORD err = GetLastError();
4816 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4817 }
4818 CloseHandle(hMap);
4819 CloseHandle(hFile);
4820 return NULL;
4821 }
4822
4823 if (CloseHandle(hMap) == 0) {
4824 if (PrintMiscellaneous && Verbose) {
4825 DWORD err = GetLastError();
4826 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4827 }
4828 CloseHandle(hFile);
4829 return base;
4830 }
4831 }
4832
4833 if (allow_exec) {
4834 DWORD old_protect;
4835 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4836 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4837
4838 if (!res) {
4839 if (PrintMiscellaneous && Verbose) {
4840 DWORD err = GetLastError();
4841 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4842 }
4843 // Don't consider this a hard error, on IA32 even if the
4844 // VirtualProtect fails, we should still be able to execute
4845 CloseHandle(hFile);
4846 return base;
4847 }
4848 }
4849
4850 if (CloseHandle(hFile) == 0) {
4851 if (PrintMiscellaneous && Verbose) {
4852 DWORD err = GetLastError();
4853 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4854 }
4855 return base;
4856 }
4857
4858 return base;
4859 }
4860
4861
4862 // Remap a block of memory.
4863 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4864 char *addr, size_t bytes, bool read_only,
4865 bool allow_exec) {
4866 // This OS does not allow existing memory maps to be remapped so we
4867 // have to unmap the memory before we remap it.
4868 if (!os::unmap_memory(addr, bytes)) {
4869 return NULL;
4870 }
4871
4872 // There is a very small theoretical window between the unmap_memory()
4873 // call above and the map_memory() call below where a thread in native
4874 // code may be able to access an address that is no longer mapped.
4875
4876 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4877 read_only, allow_exec);
4878 }
4879
4880
4881 // Unmap a block of memory.
4882 // Returns true=success, otherwise false.
4883
4884 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4885 MEMORY_BASIC_INFORMATION mem_info;
4886 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4887 if (PrintMiscellaneous && Verbose) {
4888 DWORD err = GetLastError();
4889 tty->print_cr("VirtualQuery() failed: GetLastError->%ld.", err);
4890 }
4891 return false;
4892 }
4893
4894 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4895 // Instead, executable region was allocated using VirtualAlloc(). See
4896 // pd_map_memory() above.
4897 //
4898 // The following flags should match the 'exec_access' flages used for
4899 // VirtualProtect() in pd_map_memory().
4900 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4901 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4902 return pd_release_memory(addr, bytes);
4903 }
4904
4905 BOOL result = UnmapViewOfFile(addr);
4906 if (result == 0) {
4907 if (PrintMiscellaneous && Verbose) {
4908 DWORD err = GetLastError();
4909 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4910 }
4911 return false;
4912 }
4913 return true;
4914 }
4915
4916 void os::pause() {
4917 char filename[MAX_PATH];
4918 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4919 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4920 } else {
4921 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4922 }
4923
4924 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4925 if (fd != -1) {
4926 struct stat buf;
4927 ::close(fd);
4928 while (::stat(filename, &buf) == 0) {
4929 Sleep(100);
4930 }
4931 } else {
4932 jio_fprintf(stderr,
4933 "Could not open pause file '%s', continuing immediately.\n", filename);
4934 }
4935 }
4936
4937 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4938 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4939 }
4940
4941 // See the caveats for this class in os_windows.hpp
4942 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4943 // into this method and returns false. If no OS EXCEPTION was raised, returns
4944 // true.
4945 // The callback is supposed to provide the method that should be protected.
4946 //
4947 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4948 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4949 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4950 "crash_protection already set?");
4951
4952 bool success = true;
4953 __try {
4954 WatcherThread::watcher_thread()->set_crash_protection(this);
4955 cb.call();
4956 } __except(EXCEPTION_EXECUTE_HANDLER) {
4957 // only for protection, nothing to do
4958 success = false;
4959 }
4960 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4961 return success;
4962 }
4963
4964 // An Event wraps a win32 "CreateEvent" kernel handle.
4965 //
4966 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4967 //
4968 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4969 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4970 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4971 // In addition, an unpark() operation might fetch the handle field, but the
4972 // event could recycle between the fetch and the SetEvent() operation.
4973 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4974 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4975 // on an stale but recycled handle would be harmless, but in practice this might
4976 // confuse other non-Sun code, so it's not a viable approach.
4977 //
4978 // 2: Once a win32 event handle is associated with an Event, it remains associated
4979 // with the Event. The event handle is never closed. This could be construed
4980 // as handle leakage, but only up to the maximum # of threads that have been extant
4981 // at any one time. This shouldn't be an issue, as windows platforms typically
4982 // permit a process to have hundreds of thousands of open handles.
4983 //
4984 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4985 // and release unused handles.
4986 //
4987 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4988 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4989 //
4990 // 5. Use an RCU-like mechanism (Read-Copy Update).
4991 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4992 //
4993 // We use (2).
4994 //
4995 // TODO-FIXME:
4996 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4997 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4998 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4999 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5000 // into a single win32 CreateEvent() handle.
5001 //
5002 // Assumption:
5003 // Only one parker can exist on an event, which is why we allocate
5004 // them per-thread. Multiple unparkers can coexist.
5005 //
5006 // _Event transitions in park()
5007 // -1 => -1 : illegal
5008 // 1 => 0 : pass - return immediately
5009 // 0 => -1 : block; then set _Event to 0 before returning
5010 //
5011 // _Event transitions in unpark()
5012 // 0 => 1 : just return
5013 // 1 => 1 : just return
5014 // -1 => either 0 or 1; must signal target thread
5015 // That is, we can safely transition _Event from -1 to either
5016 // 0 or 1.
5017 //
5018 // _Event serves as a restricted-range semaphore.
5019 // -1 : thread is blocked, i.e. there is a waiter
5020 // 0 : neutral: thread is running or ready,
5021 // could have been signaled after a wait started
5022 // 1 : signaled - thread is running or ready
5023 //
5024 // Another possible encoding of _Event would be with
5025 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5026 //
5027
5028 int os::PlatformEvent::park(jlong Millis) {
5029 // Transitions for _Event:
5030 // -1 => -1 : illegal
5031 // 1 => 0 : pass - return immediately
5032 // 0 => -1 : block; then set _Event to 0 before returning
5033
5034 guarantee(_ParkHandle != NULL , "Invariant");
5035 guarantee(Millis > 0 , "Invariant");
5036
5037 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5038 // the initial park() operation.
5039 // Consider: use atomic decrement instead of CAS-loop
5040
5041 int v;
5042 for (;;) {
5043 v = _Event;
5044 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5045 }
5046 guarantee((v == 0) || (v == 1), "invariant");
5047 if (v != 0) return OS_OK;
5048
5049 // Do this the hard way by blocking ...
5050 // TODO: consider a brief spin here, gated on the success of recent
5051 // spin attempts by this thread.
5052 //
5053 // We decompose long timeouts into series of shorter timed waits.
5054 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5055 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5056 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5057 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5058 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5059 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5060 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5061 // for the already waited time. This policy does not admit any new outcomes.
5062 // In the future, however, we might want to track the accumulated wait time and
5063 // adjust Millis accordingly if we encounter a spurious wakeup.
5064
5065 const int MAXTIMEOUT = 0x10000000;
5066 DWORD rv = WAIT_TIMEOUT;
5067 while (_Event < 0 && Millis > 0) {
5068 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5069 if (Millis > MAXTIMEOUT) {
5070 prd = MAXTIMEOUT;
5071 }
5072 rv = ::WaitForSingleObject(_ParkHandle, prd);
5073 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5074 if (rv == WAIT_TIMEOUT) {
5075 Millis -= prd;
5076 }
5077 }
5078 v = _Event;
5079 _Event = 0;
5080 // see comment at end of os::PlatformEvent::park() below:
5081 OrderAccess::fence();
5082 // If we encounter a nearly simultanous timeout expiry and unpark()
5083 // we return OS_OK indicating we awoke via unpark().
5084 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5085 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5086 }
5087
5088 void os::PlatformEvent::park() {
5089 // Transitions for _Event:
5090 // -1 => -1 : illegal
5091 // 1 => 0 : pass - return immediately
5092 // 0 => -1 : block; then set _Event to 0 before returning
5093
5094 guarantee(_ParkHandle != NULL, "Invariant");
5095 // Invariant: Only the thread associated with the Event/PlatformEvent
5096 // may call park().
5097 // Consider: use atomic decrement instead of CAS-loop
5098 int v;
5099 for (;;) {
5100 v = _Event;
5101 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5102 }
5103 guarantee((v == 0) || (v == 1), "invariant");
5104 if (v != 0) return;
5105
5106 // Do this the hard way by blocking ...
5107 // TODO: consider a brief spin here, gated on the success of recent
5108 // spin attempts by this thread.
5109 while (_Event < 0) {
5110 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5111 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5112 }
5113
5114 // Usually we'll find _Event == 0 at this point, but as
5115 // an optional optimization we clear it, just in case can
5116 // multiple unpark() operations drove _Event up to 1.
5117 _Event = 0;
5118 OrderAccess::fence();
5119 guarantee(_Event >= 0, "invariant");
5120 }
5121
5122 void os::PlatformEvent::unpark() {
5123 guarantee(_ParkHandle != NULL, "Invariant");
5124
5125 // Transitions for _Event:
5126 // 0 => 1 : just return
5127 // 1 => 1 : just return
5128 // -1 => either 0 or 1; must signal target thread
5129 // That is, we can safely transition _Event from -1 to either
5130 // 0 or 1.
5131 // See also: "Semaphores in Plan 9" by Mullender & Cox
5132 //
5133 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5134 // that it will take two back-to-back park() calls for the owning
5135 // thread to block. This has the benefit of forcing a spurious return
5136 // from the first park() call after an unpark() call which will help
5137 // shake out uses of park() and unpark() without condition variables.
5138
5139 if (Atomic::xchg(1, &_Event) >= 0) return;
5140
5141 ::SetEvent(_ParkHandle);
5142 }
5143
5144
5145 // JSR166
5146 // -------------------------------------------------------
5147
5148 // The Windows implementation of Park is very straightforward: Basic
5149 // operations on Win32 Events turn out to have the right semantics to
5150 // use them directly. We opportunistically resuse the event inherited
5151 // from Monitor.
5152
5153 void Parker::park(bool isAbsolute, jlong time) {
5154 guarantee(_ParkEvent != NULL, "invariant");
5155 // First, demultiplex/decode time arguments
5156 if (time < 0) { // don't wait
5157 return;
5158 } else if (time == 0 && !isAbsolute) {
5159 time = INFINITE;
5160 } else if (isAbsolute) {
5161 time -= os::javaTimeMillis(); // convert to relative time
5162 if (time <= 0) { // already elapsed
5163 return;
5164 }
5165 } else { // relative
5166 time /= 1000000; // Must coarsen from nanos to millis
5167 if (time == 0) { // Wait for the minimal time unit if zero
5168 time = 1;
5169 }
5170 }
5171
5172 JavaThread* thread = (JavaThread*)(Thread::current());
5173 assert(thread->is_Java_thread(), "Must be JavaThread");
5174 JavaThread *jt = (JavaThread *)thread;
5175
5176 // Don't wait if interrupted or already triggered
5177 if (Thread::is_interrupted(thread, false) ||
5178 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5179 ResetEvent(_ParkEvent);
5180 return;
5181 } else {
5182 ThreadBlockInVM tbivm(jt);
5183 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5184 jt->set_suspend_equivalent();
5185
5186 WaitForSingleObject(_ParkEvent, time);
5187 ResetEvent(_ParkEvent);
5188
5189 // If externally suspended while waiting, re-suspend
5190 if (jt->handle_special_suspend_equivalent_condition()) {
5191 jt->java_suspend_self();
5192 }
5193 }
5194 }
5195
5196 void Parker::unpark() {
5197 guarantee(_ParkEvent != NULL, "invariant");
5198 SetEvent(_ParkEvent);
5199 }
5200
5201 // Run the specified command in a separate process. Return its exit value,
5202 // or -1 on failure (e.g. can't create a new process).
5203 int os::fork_and_exec(char* cmd) {
5204 STARTUPINFO si;
5205 PROCESS_INFORMATION pi;
5206
5207 memset(&si, 0, sizeof(si));
5208 si.cb = sizeof(si);
5209 memset(&pi, 0, sizeof(pi));
5210 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5211 cmd, // command line
5212 NULL, // process security attribute
5213 NULL, // thread security attribute
5214 TRUE, // inherits system handles
5215 0, // no creation flags
5216 NULL, // use parent's environment block
5217 NULL, // use parent's starting directory
5218 &si, // (in) startup information
5219 &pi); // (out) process information
5220
5221 if (rslt) {
5222 // Wait until child process exits.
5223 WaitForSingleObject(pi.hProcess, INFINITE);
5224
5225 DWORD exit_code;
5226 GetExitCodeProcess(pi.hProcess, &exit_code);
5227
5228 // Close process and thread handles.
5229 CloseHandle(pi.hProcess);
5230 CloseHandle(pi.hThread);
5231
5232 return (int)exit_code;
5233 } else {
5234 return -1;
5235 }
5236 }
5237
5238 //--------------------------------------------------------------------------------------------------
5239 // Non-product code
5240
5241 static int mallocDebugIntervalCounter = 0;
5242 static int mallocDebugCounter = 0;
5243 bool os::check_heap(bool force) {
5244 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5245 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5246 // Note: HeapValidate executes two hardware breakpoints when it finds something
5247 // wrong; at these points, eax contains the address of the offending block (I think).
5248 // To get to the exlicit error message(s) below, just continue twice.
5249 HANDLE heap = GetProcessHeap();
5250
5251 // If we fail to lock the heap, then gflags.exe has been used
5252 // or some other special heap flag has been set that prevents
5253 // locking. We don't try to walk a heap we can't lock.
5254 if (HeapLock(heap) != 0) {
5255 PROCESS_HEAP_ENTRY phe;
5256 phe.lpData = NULL;
5257 while (HeapWalk(heap, &phe) != 0) {
5258 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5259 !HeapValidate(heap, 0, phe.lpData)) {
5260 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5261 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5262 fatal("corrupted C heap");
5263 }
5264 }
5265 DWORD err = GetLastError();
5266 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5267 fatal(err_msg("heap walk aborted with error %d", err));
5268 }
5269 HeapUnlock(heap);
5270 }
5271 mallocDebugIntervalCounter = 0;
5272 }
5273 return true;
5274 }
5275
5276
5277 bool os::find(address addr, outputStream* st) {
5278 // Nothing yet
5279 return false;
5280 }
5281
5282 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5283 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5284
5285 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5286 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5287 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5288 address addr = (address) exceptionRecord->ExceptionInformation[1];
5289
5290 if (os::is_memory_serialize_page(thread, addr)) {
5291 return EXCEPTION_CONTINUE_EXECUTION;
5292 }
5293 }
5294
5295 return EXCEPTION_CONTINUE_SEARCH;
5296 }
5297
5298 // We don't build a headless jre for Windows
5299 bool os::is_headless_jre() { return false; }
5300
5301 static jint initSock() {
5302 WSADATA wsadata;
5303
5304 if (!os::WinSock2Dll::WinSock2Available()) {
5305 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5306 ::GetLastError());
5307 return JNI_ERR;
5308 }
5309
5310 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5311 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5312 ::GetLastError());
5313 return JNI_ERR;
5314 }
5315 return JNI_OK;
5316 }
5317
5318 struct hostent* os::get_host_by_name(char* name) {
5319 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5320 }
5321
5322 int os::socket_close(int fd) {
5323 return ::closesocket(fd);
5324 }
5325
5326 int os::socket(int domain, int type, int protocol) {
5327 return ::socket(domain, type, protocol);
5328 }
5329
5330 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5331 return ::connect(fd, him, len);
5332 }
5333
5334 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5335 return ::recv(fd, buf, (int)nBytes, flags);
5336 }
5337
5338 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5339 return ::send(fd, buf, (int)nBytes, flags);
5340 }
5341
5342 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5343 return ::send(fd, buf, (int)nBytes, flags);
5344 }
5345
5346 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5347 #if defined(IA32)
5348 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5349 #elif defined (AMD64)
5350 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5351 #endif
5352
5353 // returns true if thread could be suspended,
5354 // false otherwise
5355 static bool do_suspend(HANDLE* h) {
5356 if (h != NULL) {
5357 if (SuspendThread(*h) != ~0) {
5358 return true;
5359 }
5360 }
5361 return false;
5362 }
5363
5364 // resume the thread
5365 // calling resume on an active thread is a no-op
5366 static void do_resume(HANDLE* h) {
5367 if (h != NULL) {
5368 ResumeThread(*h);
5369 }
5370 }
5371
5372 // retrieve a suspend/resume context capable handle
5373 // from the tid. Caller validates handle return value.
5374 void get_thread_handle_for_extended_context(HANDLE* h,
5375 OSThread::thread_id_t tid) {
5376 if (h != NULL) {
5377 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5378 }
5379 }
5380
5381 // Thread sampling implementation
5382 //
5383 void os::SuspendedThreadTask::internal_do_task() {
5384 CONTEXT ctxt;
5385 HANDLE h = NULL;
5386
5387 // get context capable handle for thread
5388 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5389
5390 // sanity
5391 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5392 return;
5393 }
5394
5395 // suspend the thread
5396 if (do_suspend(&h)) {
5397 ctxt.ContextFlags = sampling_context_flags;
5398 // get thread context
5399 GetThreadContext(h, &ctxt);
5400 SuspendedThreadTaskContext context(_thread, &ctxt);
5401 // pass context to Thread Sampling impl
5402 do_task(context);
5403 // resume thread
5404 do_resume(&h);
5405 }
5406
5407 // close handle
5408 CloseHandle(h);
5409 }
5410
5411
5412 // Kernel32 API
5413 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5414 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5415 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5416 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5417 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5418
5419 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5420 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5421 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5422 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5423 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5424
5425
5426 BOOL os::Kernel32Dll::initialized = FALSE;
5427 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5428 assert(initialized && _GetLargePageMinimum != NULL,
5429 "GetLargePageMinimumAvailable() not yet called");
5430 return _GetLargePageMinimum();
5431 }
5432
5433 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5434 if (!initialized) {
5435 initialize();
5436 }
5437 return _GetLargePageMinimum != NULL;
5438 }
5439
5440 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5441 if (!initialized) {
5442 initialize();
5443 }
5444 return _VirtualAllocExNuma != NULL;
5445 }
5446
5447 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5448 SIZE_T bytes, DWORD flags,
5449 DWORD prot, DWORD node) {
5450 assert(initialized && _VirtualAllocExNuma != NULL,
5451 "NUMACallsAvailable() not yet called");
5452
5453 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5454 }
5455
5456 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5457 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5458 "NUMACallsAvailable() not yet called");
5459
5460 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5461 }
5462
5463 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5464 PULONGLONG proc_mask) {
5465 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5466 "NUMACallsAvailable() not yet called");
5467
5468 return _GetNumaNodeProcessorMask(node, proc_mask);
5469 }
5470
5471 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5472 ULONG FrameToCapture,
5473 PVOID* BackTrace,
5474 PULONG BackTraceHash) {
5475 if (!initialized) {
5476 initialize();
5477 }
5478
5479 if (_RtlCaptureStackBackTrace != NULL) {
5480 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5481 BackTrace, BackTraceHash);
5482 } else {
5483 return 0;
5484 }
5485 }
5486
5487 void os::Kernel32Dll::initializeCommon() {
5488 if (!initialized) {
5489 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5490 assert(handle != NULL, "Just check");
5491 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5492 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5493 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5494 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5495 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5496 initialized = TRUE;
5497 }
5498 }
5499
5500
5501
5502 #ifndef JDK6_OR_EARLIER
5503
5504 void os::Kernel32Dll::initialize() {
5505 initializeCommon();
5506 }
5507
5508
5509 // Kernel32 API
5510 inline BOOL os::Kernel32Dll::SwitchToThread() {
5511 return ::SwitchToThread();
5512 }
5513
5514 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5515 return true;
5516 }
5517
5518 // Help tools
5519 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5520 return true;
5521 }
5522
5523 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5524 DWORD th32ProcessId) {
5525 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5526 }
5527
5528 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5529 LPMODULEENTRY32 lpme) {
5530 return ::Module32First(hSnapshot, lpme);
5531 }
5532
5533 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5534 LPMODULEENTRY32 lpme) {
5535 return ::Module32Next(hSnapshot, lpme);
5536 }
5537
5538 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5539 ::GetNativeSystemInfo(lpSystemInfo);
5540 }
5541
5542 // PSAPI API
5543 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5544 HMODULE *lpModule, DWORD cb,
5545 LPDWORD lpcbNeeded) {
5546 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5547 }
5548
5549 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5550 HMODULE hModule,
5551 LPTSTR lpFilename,
5552 DWORD nSize) {
5553 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5554 }
5555
5556 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5557 HMODULE hModule,
5558 LPMODULEINFO lpmodinfo,
5559 DWORD cb) {
5560 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5561 }
5562
5563 inline BOOL os::PSApiDll::PSApiAvailable() {
5564 return true;
5565 }
5566
5567
5568 // WinSock2 API
5569 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5570 LPWSADATA lpWSAData) {
5571 return ::WSAStartup(wVersionRequested, lpWSAData);
5572 }
5573
5574 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5575 return ::gethostbyname(name);
5576 }
5577
5578 inline BOOL os::WinSock2Dll::WinSock2Available() {
5579 return true;
5580 }
5581
5582 // Advapi API
5583 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5584 BOOL DisableAllPrivileges,
5585 PTOKEN_PRIVILEGES NewState,
5586 DWORD BufferLength,
5587 PTOKEN_PRIVILEGES PreviousState,
5588 PDWORD ReturnLength) {
5589 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5590 BufferLength, PreviousState, ReturnLength);
5591 }
5592
5593 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5594 DWORD DesiredAccess,
5595 PHANDLE TokenHandle) {
5596 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5597 }
5598
5599 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5600 LPCTSTR lpName,
5601 PLUID lpLuid) {
5602 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5603 }
5604
5605 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5606 return true;
5607 }
5608
5609 void* os::get_default_process_handle() {
5610 return (void*)GetModuleHandle(NULL);
5611 }
5612
5613 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5614 // which is used to find statically linked in agents.
5615 // Additionally for windows, takes into account __stdcall names.
5616 // Parameters:
5617 // sym_name: Symbol in library we are looking for
5618 // lib_name: Name of library to look in, NULL for shared libs.
5619 // is_absolute_path == true if lib_name is absolute path to agent
5620 // such as "C:/a/b/L.dll"
5621 // == false if only the base name of the library is passed in
5622 // such as "L"
5623 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5624 bool is_absolute_path) {
5625 char *agent_entry_name;
5626 size_t len;
5627 size_t name_len;
5628 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5629 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5630 const char *start;
5631
5632 if (lib_name != NULL) {
5633 len = name_len = strlen(lib_name);
5634 if (is_absolute_path) {
5635 // Need to strip path, prefix and suffix
5636 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5637 lib_name = ++start;
5638 } else {
5639 // Need to check for drive prefix
5640 if ((start = strchr(lib_name, ':')) != NULL) {
5641 lib_name = ++start;
5642 }
5643 }
5644 if (len <= (prefix_len + suffix_len)) {
5645 return NULL;
5646 }
5647 lib_name += prefix_len;
5648 name_len = strlen(lib_name) - suffix_len;
5649 }
5650 }
5651 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5652 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5653 if (agent_entry_name == NULL) {
5654 return NULL;
5655 }
5656 if (lib_name != NULL) {
5657 const char *p = strrchr(sym_name, '@');
5658 if (p != NULL && p != sym_name) {
5659 // sym_name == _Agent_OnLoad@XX
5660 strncpy(agent_entry_name, sym_name, (p - sym_name));
5661 agent_entry_name[(p-sym_name)] = '\0';
5662 // agent_entry_name == _Agent_OnLoad
5663 strcat(agent_entry_name, "_");
5664 strncat(agent_entry_name, lib_name, name_len);
5665 strcat(agent_entry_name, p);
5666 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5667 } else {
5668 strcpy(agent_entry_name, sym_name);
5669 strcat(agent_entry_name, "_");
5670 strncat(agent_entry_name, lib_name, name_len);
5671 }
5672 } else {
5673 strcpy(agent_entry_name, sym_name);
5674 }
5675 return agent_entry_name;
5676 }
5677
5678 #else
5679 // Kernel32 API
5680 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5681 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5682 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5683 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5684 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5685
5686 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5687 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5688 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5689 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5690 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5691
5692 void os::Kernel32Dll::initialize() {
5693 if (!initialized) {
5694 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5695 assert(handle != NULL, "Just check");
5696
5697 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5698 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5699 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5700 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5701 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5702 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5703 initializeCommon(); // resolve the functions that always need resolving
5704
5705 initialized = TRUE;
5706 }
5707 }
5708
5709 BOOL os::Kernel32Dll::SwitchToThread() {
5710 assert(initialized && _SwitchToThread != NULL,
5711 "SwitchToThreadAvailable() not yet called");
5712 return _SwitchToThread();
5713 }
5714
5715
5716 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5717 if (!initialized) {
5718 initialize();
5719 }
5720 return _SwitchToThread != NULL;
5721 }
5722
5723 // Help tools
5724 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5725 if (!initialized) {
5726 initialize();
5727 }
5728 return _CreateToolhelp32Snapshot != NULL &&
5729 _Module32First != NULL &&
5730 _Module32Next != NULL;
5731 }
5732
5733 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5734 DWORD th32ProcessId) {
5735 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5736 "HelpToolsAvailable() not yet called");
5737
5738 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5739 }
5740
5741 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5742 assert(initialized && _Module32First != NULL,
5743 "HelpToolsAvailable() not yet called");
5744
5745 return _Module32First(hSnapshot, lpme);
5746 }
5747
5748 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5749 LPMODULEENTRY32 lpme) {
5750 assert(initialized && _Module32Next != NULL,
5751 "HelpToolsAvailable() not yet called");
5752
5753 return _Module32Next(hSnapshot, lpme);
5754 }
5755
5756
5757 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5758 if (!initialized) {
5759 initialize();
5760 }
5761 return _GetNativeSystemInfo != NULL;
5762 }
5763
5764 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5765 assert(initialized && _GetNativeSystemInfo != NULL,
5766 "GetNativeSystemInfoAvailable() not yet called");
5767
5768 _GetNativeSystemInfo(lpSystemInfo);
5769 }
5770
5771 // PSAPI API
5772
5773
5774 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5775 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5776 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5777
5778 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5779 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5780 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5781 BOOL os::PSApiDll::initialized = FALSE;
5782
5783 void os::PSApiDll::initialize() {
5784 if (!initialized) {
5785 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5786 if (handle != NULL) {
5787 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5788 "EnumProcessModules");
5789 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5790 "GetModuleFileNameExA");
5791 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5792 "GetModuleInformation");
5793 }
5794 initialized = TRUE;
5795 }
5796 }
5797
5798
5799
5800 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5801 DWORD cb, LPDWORD lpcbNeeded) {
5802 assert(initialized && _EnumProcessModules != NULL,
5803 "PSApiAvailable() not yet called");
5804 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5805 }
5806
5807 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5808 LPTSTR lpFilename, DWORD nSize) {
5809 assert(initialized && _GetModuleFileNameEx != NULL,
5810 "PSApiAvailable() not yet called");
5811 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5812 }
5813
5814 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5815 LPMODULEINFO lpmodinfo, DWORD cb) {
5816 assert(initialized && _GetModuleInformation != NULL,
5817 "PSApiAvailable() not yet called");
5818 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5819 }
5820
5821 BOOL os::PSApiDll::PSApiAvailable() {
5822 if (!initialized) {
5823 initialize();
5824 }
5825 return _EnumProcessModules != NULL &&
5826 _GetModuleFileNameEx != NULL &&
5827 _GetModuleInformation != NULL;
5828 }
5829
5830
5831 // WinSock2 API
5832 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5833 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5834
5835 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5836 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5837 BOOL os::WinSock2Dll::initialized = FALSE;
5838
5839 void os::WinSock2Dll::initialize() {
5840 if (!initialized) {
5841 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5842 if (handle != NULL) {
5843 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5844 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5845 }
5846 initialized = TRUE;
5847 }
5848 }
5849
5850
5851 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5852 assert(initialized && _WSAStartup != NULL,
5853 "WinSock2Available() not yet called");
5854 return _WSAStartup(wVersionRequested, lpWSAData);
5855 }
5856
5857 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5858 assert(initialized && _gethostbyname != NULL,
5859 "WinSock2Available() not yet called");
5860 return _gethostbyname(name);
5861 }
5862
5863 BOOL os::WinSock2Dll::WinSock2Available() {
5864 if (!initialized) {
5865 initialize();
5866 }
5867 return _WSAStartup != NULL &&
5868 _gethostbyname != NULL;
5869 }
5870
5871 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5872 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5873 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5874
5875 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5876 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5877 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5878 BOOL os::Advapi32Dll::initialized = FALSE;
5879
5880 void os::Advapi32Dll::initialize() {
5881 if (!initialized) {
5882 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5883 if (handle != NULL) {
5884 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5885 "AdjustTokenPrivileges");
5886 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5887 "OpenProcessToken");
5888 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5889 "LookupPrivilegeValueA");
5890 }
5891 initialized = TRUE;
5892 }
5893 }
5894
5895 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5896 BOOL DisableAllPrivileges,
5897 PTOKEN_PRIVILEGES NewState,
5898 DWORD BufferLength,
5899 PTOKEN_PRIVILEGES PreviousState,
5900 PDWORD ReturnLength) {
5901 assert(initialized && _AdjustTokenPrivileges != NULL,
5902 "AdvapiAvailable() not yet called");
5903 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5904 BufferLength, PreviousState, ReturnLength);
5905 }
5906
5907 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5908 DWORD DesiredAccess,
5909 PHANDLE TokenHandle) {
5910 assert(initialized && _OpenProcessToken != NULL,
5911 "AdvapiAvailable() not yet called");
5912 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5913 }
5914
5915 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5916 LPCTSTR lpName, PLUID lpLuid) {
5917 assert(initialized && _LookupPrivilegeValue != NULL,
5918 "AdvapiAvailable() not yet called");
5919 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5920 }
5921
5922 BOOL os::Advapi32Dll::AdvapiAvailable() {
5923 if (!initialized) {
5924 initialize();
5925 }
5926 return _AdjustTokenPrivileges != NULL &&
5927 _OpenProcessToken != NULL &&
5928 _LookupPrivilegeValue != NULL;
5929 }
5930
5931 #endif
5932
5933 #ifndef PRODUCT
5934
5935 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5936 // contiguous memory block at a particular address.
5937 // The test first tries to find a good approximate address to allocate at by using the same
5938 // method to allocate some memory at any address. The test then tries to allocate memory in
5939 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5940 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5941 // the previously allocated memory is available for allocation. The only actual failure
5942 // that is reported is when the test tries to allocate at a particular location but gets a
5943 // different valid one. A NULL return value at this point is not considered an error but may
5944 // be legitimate.
5945 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5946 void TestReserveMemorySpecial_test() {
5947 if (!UseLargePages) {
5948 if (VerboseInternalVMTests) {
5949 gclog_or_tty->print("Skipping test because large pages are disabled");
5950 }
5951 return;
5952 }
5953 // save current value of globals
5954 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5955 bool old_use_numa_interleaving = UseNUMAInterleaving;
5956
5957 // set globals to make sure we hit the correct code path
5958 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5959
5960 // do an allocation at an address selected by the OS to get a good one.
5961 const size_t large_allocation_size = os::large_page_size() * 4;
5962 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5963 if (result == NULL) {
5964 if (VerboseInternalVMTests) {
5965 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5966 large_allocation_size);
5967 }
5968 } else {
5969 os::release_memory_special(result, large_allocation_size);
5970
5971 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5972 // we managed to get it once.
5973 const size_t expected_allocation_size = os::large_page_size();
5974 char* expected_location = result + os::large_page_size();
5975 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5976 if (actual_location == NULL) {
5977 if (VerboseInternalVMTests) {
5978 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5979 expected_location, large_allocation_size);
5980 }
5981 } else {
5982 // release memory
5983 os::release_memory_special(actual_location, expected_allocation_size);
5984 // only now check, after releasing any memory to avoid any leaks.
5985 assert(actual_location == expected_location,
5986 err_msg("Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5987 expected_location, expected_allocation_size, actual_location));
5988 }
5989 }
5990
5991 // restore globals
5992 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5993 UseNUMAInterleaving = old_use_numa_interleaving;
5994 }
5995 #endif // PRODUCT