1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/vmError.hpp"
74
75 #ifdef _DEBUG
76 #include <crtdbg.h>
77 #endif
78
79
80 #include <windows.h>
81 #include <sys/types.h>
82 #include <sys/stat.h>
83 #include <sys/timeb.h>
84 #include <objidl.h>
85 #include <shlobj.h>
86
87 #include <malloc.h>
88 #include <signal.h>
89 #include <direct.h>
90 #include <errno.h>
91 #include <fcntl.h>
92 #include <io.h>
93 #include <process.h> // For _beginthreadex(), _endthreadex()
94 #include <imagehlp.h> // For os::dll_address_to_function_name
95 // for enumerating dll libraries
96 #include <vdmdbg.h>
97
98 // for timer info max values which include all bits
99 #define ALL_64_BITS CONST64(-1)
100
101 // For DLL loading/load error detection
102 // Values of PE COFF
103 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
104 #define IMAGE_FILE_SIGNATURE_LENGTH 4
105
106 static HANDLE main_process;
107 static HANDLE main_thread;
108 static int main_thread_id;
109
110 static FILETIME process_creation_time;
111 static FILETIME process_exit_time;
112 static FILETIME process_user_time;
113 static FILETIME process_kernel_time;
114
115 #ifdef _M_IA64
116 #define __CPU__ ia64
117 #elif _M_AMD64
118 #define __CPU__ amd64
119 #else
120 #define __CPU__ i486
121 #endif
122
123 // save DLL module handle, used by GetModuleFileName
124
125 HINSTANCE vm_lib_handle;
126
127 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
128 switch (reason) {
129 case DLL_PROCESS_ATTACH:
130 vm_lib_handle = hinst;
131 if (ForceTimeHighResolution) {
132 timeBeginPeriod(1L);
133 }
134 break;
135 case DLL_PROCESS_DETACH:
136 if (ForceTimeHighResolution) {
137 timeEndPeriod(1L);
138 }
139 break;
140 default:
141 break;
142 }
143 return true;
144 }
145
146 static inline double fileTimeAsDouble(FILETIME* time) {
147 const double high = (double) ((unsigned int) ~0);
148 const double split = 10000000.0;
149 double result = (time->dwLowDateTime / split) +
150 time->dwHighDateTime * (high/split);
151 return result;
152 }
153
154 // Implementation of os
155
156 bool os::getenv(const char* name, char* buffer, int len) {
157 int result = GetEnvironmentVariable(name, buffer, len);
158 return result > 0 && result < len;
159 }
160
161 bool os::unsetenv(const char* name) {
162 assert(name != NULL, "Null pointer");
163 return (SetEnvironmentVariable(name, NULL) == TRUE);
164 }
165
166 // No setuid programs under Windows.
167 bool os::have_special_privileges() {
168 return false;
169 }
170
171
172 // This method is a periodic task to check for misbehaving JNI applications
173 // under CheckJNI, we can add any periodic checks here.
174 // For Windows at the moment does nothing
175 void os::run_periodic_checks() {
176 return;
177 }
178
179 // previous UnhandledExceptionFilter, if there is one
180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181
182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
183
184 void os::init_system_properties_values() {
185 // sysclasspath, java_home, dll_dir
186 {
187 char *home_path;
188 char *dll_path;
189 char *pslash;
190 char *bin = "\\bin";
191 char home_dir[MAX_PATH];
192
193 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
194 os::jvm_path(home_dir, sizeof(home_dir));
195 // Found the full path to jvm.dll.
196 // Now cut the path to <java_home>/jre if we can.
197 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
198 pslash = strrchr(home_dir, '\\');
199 if (pslash != NULL) {
200 *pslash = '\0'; // get rid of \{client|server}
201 pslash = strrchr(home_dir, '\\');
202 if (pslash != NULL) {
203 *pslash = '\0'; // get rid of \bin
204 }
205 }
206 }
207
208 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
209 if (home_path == NULL) {
210 return;
211 }
212 strcpy(home_path, home_dir);
213 Arguments::set_java_home(home_path);
214 FREE_C_HEAP_ARRAY(char, home_path, mtInternal);
215
216 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
217 mtInternal);
218 if (dll_path == NULL) {
219 return;
220 }
221 strcpy(dll_path, home_dir);
222 strcat(dll_path, bin);
223 Arguments::set_dll_dir(dll_path);
224 FREE_C_HEAP_ARRAY(char, dll_path, mtInternal);
225
226 if (!set_boot_path('\\', ';')) {
227 return;
228 }
229 }
230
231 // library_path
232 #define EXT_DIR "\\lib\\ext"
233 #define BIN_DIR "\\bin"
234 #define PACKAGE_DIR "\\Sun\\Java"
235 {
236 // Win32 library search order (See the documentation for LoadLibrary):
237 //
238 // 1. The directory from which application is loaded.
239 // 2. The system wide Java Extensions directory (Java only)
240 // 3. System directory (GetSystemDirectory)
241 // 4. Windows directory (GetWindowsDirectory)
242 // 5. The PATH environment variable
243 // 6. The current directory
244
245 char *library_path;
246 char tmp[MAX_PATH];
247 char *path_str = ::getenv("PATH");
248
249 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
250 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
251
252 library_path[0] = '\0';
253
254 GetModuleFileName(NULL, tmp, sizeof(tmp));
255 *(strrchr(tmp, '\\')) = '\0';
256 strcat(library_path, tmp);
257
258 GetWindowsDirectory(tmp, sizeof(tmp));
259 strcat(library_path, ";");
260 strcat(library_path, tmp);
261 strcat(library_path, PACKAGE_DIR BIN_DIR);
262
263 GetSystemDirectory(tmp, sizeof(tmp));
264 strcat(library_path, ";");
265 strcat(library_path, tmp);
266
267 GetWindowsDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
270
271 if (path_str) {
272 strcat(library_path, ";");
273 strcat(library_path, path_str);
274 }
275
276 strcat(library_path, ";.");
277
278 Arguments::set_library_path(library_path);
279 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
280 }
281
282 // Default extensions directory
283 {
284 char path[MAX_PATH];
285 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
286 GetWindowsDirectory(path, MAX_PATH);
287 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
288 path, PACKAGE_DIR, EXT_DIR);
289 Arguments::set_ext_dirs(buf);
290 }
291 #undef EXT_DIR
292 #undef BIN_DIR
293 #undef PACKAGE_DIR
294
295 // Default endorsed standards directory.
296 {
297 #define ENDORSED_DIR "\\lib\\endorsed"
298 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
299 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
300 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
301 Arguments::set_endorsed_dirs(buf);
302 // (Arguments::set_endorsed_dirs() calls SystemProperty::set_value(), which
303 // duplicates the input.)
304 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
305 #undef ENDORSED_DIR
306 }
307
308 #ifndef _WIN64
309 // set our UnhandledExceptionFilter and save any previous one
310 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
311 #endif
312
313 // Done
314 return;
315 }
316
317 void os::breakpoint() {
318 DebugBreak();
319 }
320
321 // Invoked from the BREAKPOINT Macro
322 extern "C" void breakpoint() {
323 os::breakpoint();
324 }
325
326 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
327 // So far, this method is only used by Native Memory Tracking, which is
328 // only supported on Windows XP or later.
329 //
330 int os::get_native_stack(address* stack, int frames, int toSkip) {
331 #ifdef _NMT_NOINLINE_
332 toSkip++;
333 #endif
334 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
335 (PVOID*)stack, NULL);
336 for (int index = captured; index < frames; index ++) {
337 stack[index] = NULL;
338 }
339 return captured;
340 }
341
342
343 // os::current_stack_base()
344 //
345 // Returns the base of the stack, which is the stack's
346 // starting address. This function must be called
347 // while running on the stack of the thread being queried.
348
349 address os::current_stack_base() {
350 MEMORY_BASIC_INFORMATION minfo;
351 address stack_bottom;
352 size_t stack_size;
353
354 VirtualQuery(&minfo, &minfo, sizeof(minfo));
355 stack_bottom = (address)minfo.AllocationBase;
356 stack_size = minfo.RegionSize;
357
358 // Add up the sizes of all the regions with the same
359 // AllocationBase.
360 while (1) {
361 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
362 if (stack_bottom == (address)minfo.AllocationBase) {
363 stack_size += minfo.RegionSize;
364 } else {
365 break;
366 }
367 }
368
369 #ifdef _M_IA64
370 // IA64 has memory and register stacks
371 //
372 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
373 // at thread creation (1MB backing store growing upwards, 1MB memory stack
374 // growing downwards, 2MB summed up)
375 //
376 // ...
377 // ------- top of stack (high address) -----
378 // |
379 // | 1MB
380 // | Backing Store (Register Stack)
381 // |
382 // | / \
383 // | |
384 // | |
385 // | |
386 // ------------------------ stack base -----
387 // | 1MB
388 // | Memory Stack
389 // |
390 // | |
391 // | |
392 // | |
393 // | \ /
394 // |
395 // ----- bottom of stack (low address) -----
396 // ...
397
398 stack_size = stack_size / 2;
399 #endif
400 return stack_bottom + stack_size;
401 }
402
403 size_t os::current_stack_size() {
404 size_t sz;
405 MEMORY_BASIC_INFORMATION minfo;
406 VirtualQuery(&minfo, &minfo, sizeof(minfo));
407 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
408 return sz;
409 }
410
411 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
412 const struct tm* time_struct_ptr = localtime(clock);
413 if (time_struct_ptr != NULL) {
414 *res = *time_struct_ptr;
415 return res;
416 }
417 return NULL;
418 }
419
420 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
421
422 // Thread start routine for all new Java threads
423 static unsigned __stdcall java_start(Thread* thread) {
424 // Try to randomize the cache line index of hot stack frames.
425 // This helps when threads of the same stack traces evict each other's
426 // cache lines. The threads can be either from the same JVM instance, or
427 // from different JVM instances. The benefit is especially true for
428 // processors with hyperthreading technology.
429 static int counter = 0;
430 int pid = os::current_process_id();
431 _alloca(((pid ^ counter++) & 7) * 128);
432
433 OSThread* osthr = thread->osthread();
434 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
435
436 if (UseNUMA) {
437 int lgrp_id = os::numa_get_group_id();
438 if (lgrp_id != -1) {
439 thread->set_lgrp_id(lgrp_id);
440 }
441 }
442
443 // Diagnostic code to investigate JDK-6573254
444 int res = 50115; // non-java thread
445 if (thread->is_Java_thread()) {
446 res = 40115; // java thread
447 }
448
449 // Install a win32 structured exception handler around every thread created
450 // by VM, so VM can generate error dump when an exception occurred in non-
451 // Java thread (e.g. VM thread).
452 __try {
453 thread->run();
454 } __except(topLevelExceptionFilter(
455 (_EXCEPTION_POINTERS*)_exception_info())) {
456 // Nothing to do.
457 }
458
459 // One less thread is executing
460 // When the VMThread gets here, the main thread may have already exited
461 // which frees the CodeHeap containing the Atomic::add code
462 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
463 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
464 }
465
466 // Thread must not return from exit_process_or_thread(), but if it does,
467 // let it proceed to exit normally
468 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
469 }
470
471 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
472 int thread_id) {
473 // Allocate the OSThread object
474 OSThread* osthread = new OSThread(NULL, NULL);
475 if (osthread == NULL) return NULL;
476
477 // Initialize support for Java interrupts
478 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
479 if (interrupt_event == NULL) {
480 delete osthread;
481 return NULL;
482 }
483 osthread->set_interrupt_event(interrupt_event);
484
485 // Store info on the Win32 thread into the OSThread
486 osthread->set_thread_handle(thread_handle);
487 osthread->set_thread_id(thread_id);
488
489 if (UseNUMA) {
490 int lgrp_id = os::numa_get_group_id();
491 if (lgrp_id != -1) {
492 thread->set_lgrp_id(lgrp_id);
493 }
494 }
495
496 // Initial thread state is INITIALIZED, not SUSPENDED
497 osthread->set_state(INITIALIZED);
498
499 return osthread;
500 }
501
502
503 bool os::create_attached_thread(JavaThread* thread) {
504 #ifdef ASSERT
505 thread->verify_not_published();
506 #endif
507 HANDLE thread_h;
508 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
509 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
510 fatal("DuplicateHandle failed\n");
511 }
512 OSThread* osthread = create_os_thread(thread, thread_h,
513 (int)current_thread_id());
514 if (osthread == NULL) {
515 return false;
516 }
517
518 // Initial thread state is RUNNABLE
519 osthread->set_state(RUNNABLE);
520
521 thread->set_osthread(osthread);
522 return true;
523 }
524
525 bool os::create_main_thread(JavaThread* thread) {
526 #ifdef ASSERT
527 thread->verify_not_published();
528 #endif
529 if (_starting_thread == NULL) {
530 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
531 if (_starting_thread == NULL) {
532 return false;
533 }
534 }
535
536 // The primordial thread is runnable from the start)
537 _starting_thread->set_state(RUNNABLE);
538
539 thread->set_osthread(_starting_thread);
540 return true;
541 }
542
543 // Allocate and initialize a new OSThread
544 bool os::create_thread(Thread* thread, ThreadType thr_type,
545 size_t stack_size) {
546 unsigned thread_id;
547
548 // Allocate the OSThread object
549 OSThread* osthread = new OSThread(NULL, NULL);
550 if (osthread == NULL) {
551 return false;
552 }
553
554 // Initialize support for Java interrupts
555 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
556 if (interrupt_event == NULL) {
557 delete osthread;
558 return NULL;
559 }
560 osthread->set_interrupt_event(interrupt_event);
561 osthread->set_interrupted(false);
562
563 thread->set_osthread(osthread);
564
565 if (stack_size == 0) {
566 switch (thr_type) {
567 case os::java_thread:
568 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
569 if (JavaThread::stack_size_at_create() > 0) {
570 stack_size = JavaThread::stack_size_at_create();
571 }
572 break;
573 case os::compiler_thread:
574 if (CompilerThreadStackSize > 0) {
575 stack_size = (size_t)(CompilerThreadStackSize * K);
576 break;
577 } // else fall through:
578 // use VMThreadStackSize if CompilerThreadStackSize is not defined
579 case os::vm_thread:
580 case os::pgc_thread:
581 case os::cgc_thread:
582 case os::watcher_thread:
583 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
584 break;
585 }
586 }
587
588 // Create the Win32 thread
589 //
590 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
591 // does not specify stack size. Instead, it specifies the size of
592 // initially committed space. The stack size is determined by
593 // PE header in the executable. If the committed "stack_size" is larger
594 // than default value in the PE header, the stack is rounded up to the
595 // nearest multiple of 1MB. For example if the launcher has default
596 // stack size of 320k, specifying any size less than 320k does not
597 // affect the actual stack size at all, it only affects the initial
598 // commitment. On the other hand, specifying 'stack_size' larger than
599 // default value may cause significant increase in memory usage, because
600 // not only the stack space will be rounded up to MB, but also the
601 // entire space is committed upfront.
602 //
603 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
604 // for CreateThread() that can treat 'stack_size' as stack size. However we
605 // are not supposed to call CreateThread() directly according to MSDN
606 // document because JVM uses C runtime library. The good news is that the
607 // flag appears to work with _beginthredex() as well.
608
609 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
610 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
611 #endif
612
613 HANDLE thread_handle =
614 (HANDLE)_beginthreadex(NULL,
615 (unsigned)stack_size,
616 (unsigned (__stdcall *)(void*)) java_start,
617 thread,
618 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
619 &thread_id);
620 if (thread_handle == NULL) {
621 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
622 // without the flag.
623 thread_handle =
624 (HANDLE)_beginthreadex(NULL,
625 (unsigned)stack_size,
626 (unsigned (__stdcall *)(void*)) java_start,
627 thread,
628 CREATE_SUSPENDED,
629 &thread_id);
630 }
631 if (thread_handle == NULL) {
632 // Need to clean up stuff we've allocated so far
633 CloseHandle(osthread->interrupt_event());
634 thread->set_osthread(NULL);
635 delete osthread;
636 return NULL;
637 }
638
639 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
640
641 // Store info on the Win32 thread into the OSThread
642 osthread->set_thread_handle(thread_handle);
643 osthread->set_thread_id(thread_id);
644
645 // Initial thread state is INITIALIZED, not SUSPENDED
646 osthread->set_state(INITIALIZED);
647
648 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
649 return true;
650 }
651
652
653 // Free Win32 resources related to the OSThread
654 void os::free_thread(OSThread* osthread) {
655 assert(osthread != NULL, "osthread not set");
656 CloseHandle(osthread->thread_handle());
657 CloseHandle(osthread->interrupt_event());
658 delete osthread;
659 }
660
661 static jlong first_filetime;
662 static jlong initial_performance_count;
663 static jlong performance_frequency;
664
665
666 jlong as_long(LARGE_INTEGER x) {
667 jlong result = 0; // initialization to avoid warning
668 set_high(&result, x.HighPart);
669 set_low(&result, x.LowPart);
670 return result;
671 }
672
673
674 jlong os::elapsed_counter() {
675 LARGE_INTEGER count;
676 if (win32::_has_performance_count) {
677 QueryPerformanceCounter(&count);
678 return as_long(count) - initial_performance_count;
679 } else {
680 FILETIME wt;
681 GetSystemTimeAsFileTime(&wt);
682 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
683 }
684 }
685
686
687 jlong os::elapsed_frequency() {
688 if (win32::_has_performance_count) {
689 return performance_frequency;
690 } else {
691 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
692 return 10000000;
693 }
694 }
695
696
697 julong os::available_memory() {
698 return win32::available_memory();
699 }
700
701 julong os::win32::available_memory() {
702 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
703 // value if total memory is larger than 4GB
704 MEMORYSTATUSEX ms;
705 ms.dwLength = sizeof(ms);
706 GlobalMemoryStatusEx(&ms);
707
708 return (julong)ms.ullAvailPhys;
709 }
710
711 julong os::physical_memory() {
712 return win32::physical_memory();
713 }
714
715 bool os::has_allocatable_memory_limit(julong* limit) {
716 MEMORYSTATUSEX ms;
717 ms.dwLength = sizeof(ms);
718 GlobalMemoryStatusEx(&ms);
719 #ifdef _LP64
720 *limit = (julong)ms.ullAvailVirtual;
721 return true;
722 #else
723 // Limit to 1400m because of the 2gb address space wall
724 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
725 return true;
726 #endif
727 }
728
729 // VC6 lacks DWORD_PTR
730 #if _MSC_VER < 1300
731 typedef UINT_PTR DWORD_PTR;
732 #endif
733
734 int os::active_processor_count() {
735 DWORD_PTR lpProcessAffinityMask = 0;
736 DWORD_PTR lpSystemAffinityMask = 0;
737 int proc_count = processor_count();
738 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
739 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
740 // Nof active processors is number of bits in process affinity mask
741 int bitcount = 0;
742 while (lpProcessAffinityMask != 0) {
743 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
744 bitcount++;
745 }
746 return bitcount;
747 } else {
748 return proc_count;
749 }
750 }
751
752 void os::set_native_thread_name(const char *name) {
753
754 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
755 //
756 // Note that unfortunately this only works if the process
757 // is already attached to a debugger; debugger must observe
758 // the exception below to show the correct name.
759
760 const DWORD MS_VC_EXCEPTION = 0x406D1388;
761 struct {
762 DWORD dwType; // must be 0x1000
763 LPCSTR szName; // pointer to name (in user addr space)
764 DWORD dwThreadID; // thread ID (-1=caller thread)
765 DWORD dwFlags; // reserved for future use, must be zero
766 } info;
767
768 info.dwType = 0x1000;
769 info.szName = name;
770 info.dwThreadID = -1;
771 info.dwFlags = 0;
772
773 __try {
774 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
775 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
776 }
777
778 bool os::distribute_processes(uint length, uint* distribution) {
779 // Not yet implemented.
780 return false;
781 }
782
783 bool os::bind_to_processor(uint processor_id) {
784 // Not yet implemented.
785 return false;
786 }
787
788 void os::win32::initialize_performance_counter() {
789 LARGE_INTEGER count;
790 if (QueryPerformanceFrequency(&count)) {
791 win32::_has_performance_count = 1;
792 performance_frequency = as_long(count);
793 QueryPerformanceCounter(&count);
794 initial_performance_count = as_long(count);
795 } else {
796 win32::_has_performance_count = 0;
797 FILETIME wt;
798 GetSystemTimeAsFileTime(&wt);
799 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
800 }
801 }
802
803
804 double os::elapsedTime() {
805 return (double) elapsed_counter() / (double) elapsed_frequency();
806 }
807
808
809 // Windows format:
810 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
811 // Java format:
812 // Java standards require the number of milliseconds since 1/1/1970
813
814 // Constant offset - calculated using offset()
815 static jlong _offset = 116444736000000000;
816 // Fake time counter for reproducible results when debugging
817 static jlong fake_time = 0;
818
819 #ifdef ASSERT
820 // Just to be safe, recalculate the offset in debug mode
821 static jlong _calculated_offset = 0;
822 static int _has_calculated_offset = 0;
823
824 jlong offset() {
825 if (_has_calculated_offset) return _calculated_offset;
826 SYSTEMTIME java_origin;
827 java_origin.wYear = 1970;
828 java_origin.wMonth = 1;
829 java_origin.wDayOfWeek = 0; // ignored
830 java_origin.wDay = 1;
831 java_origin.wHour = 0;
832 java_origin.wMinute = 0;
833 java_origin.wSecond = 0;
834 java_origin.wMilliseconds = 0;
835 FILETIME jot;
836 if (!SystemTimeToFileTime(&java_origin, &jot)) {
837 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
838 }
839 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
840 _has_calculated_offset = 1;
841 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
842 return _calculated_offset;
843 }
844 #else
845 jlong offset() {
846 return _offset;
847 }
848 #endif
849
850 jlong windows_to_java_time(FILETIME wt) {
851 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
852 return (a - offset()) / 10000;
853 }
854
855 FILETIME java_to_windows_time(jlong l) {
856 jlong a = (l * 10000) + offset();
857 FILETIME result;
858 result.dwHighDateTime = high(a);
859 result.dwLowDateTime = low(a);
860 return result;
861 }
862
863 bool os::supports_vtime() { return true; }
864 bool os::enable_vtime() { return false; }
865 bool os::vtime_enabled() { return false; }
866
867 double os::elapsedVTime() {
868 FILETIME created;
869 FILETIME exited;
870 FILETIME kernel;
871 FILETIME user;
872 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
873 // the resolution of windows_to_java_time() should be sufficient (ms)
874 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
875 } else {
876 return elapsedTime();
877 }
878 }
879
880 jlong os::javaTimeMillis() {
881 if (UseFakeTimers) {
882 return fake_time++;
883 } else {
884 FILETIME wt;
885 GetSystemTimeAsFileTime(&wt);
886 return windows_to_java_time(wt);
887 }
888 }
889
890 jlong os::javaTimeNanos() {
891 if (!win32::_has_performance_count) {
892 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
893 } else {
894 LARGE_INTEGER current_count;
895 QueryPerformanceCounter(¤t_count);
896 double current = as_long(current_count);
897 double freq = performance_frequency;
898 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
899 return time;
900 }
901 }
902
903 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
904 if (!win32::_has_performance_count) {
905 // javaTimeMillis() doesn't have much percision,
906 // but it is not going to wrap -- so all 64 bits
907 info_ptr->max_value = ALL_64_BITS;
908
909 // this is a wall clock timer, so may skip
910 info_ptr->may_skip_backward = true;
911 info_ptr->may_skip_forward = true;
912 } else {
913 jlong freq = performance_frequency;
914 if (freq < NANOSECS_PER_SEC) {
915 // the performance counter is 64 bits and we will
916 // be multiplying it -- so no wrap in 64 bits
917 info_ptr->max_value = ALL_64_BITS;
918 } else if (freq > NANOSECS_PER_SEC) {
919 // use the max value the counter can reach to
920 // determine the max value which could be returned
921 julong max_counter = (julong)ALL_64_BITS;
922 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
923 } else {
924 // the performance counter is 64 bits and we will
925 // be using it directly -- so no wrap in 64 bits
926 info_ptr->max_value = ALL_64_BITS;
927 }
928
929 // using a counter, so no skipping
930 info_ptr->may_skip_backward = false;
931 info_ptr->may_skip_forward = false;
932 }
933 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
934 }
935
936 char* os::local_time_string(char *buf, size_t buflen) {
937 SYSTEMTIME st;
938 GetLocalTime(&st);
939 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
940 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
941 return buf;
942 }
943
944 bool os::getTimesSecs(double* process_real_time,
945 double* process_user_time,
946 double* process_system_time) {
947 HANDLE h_process = GetCurrentProcess();
948 FILETIME create_time, exit_time, kernel_time, user_time;
949 BOOL result = GetProcessTimes(h_process,
950 &create_time,
951 &exit_time,
952 &kernel_time,
953 &user_time);
954 if (result != 0) {
955 FILETIME wt;
956 GetSystemTimeAsFileTime(&wt);
957 jlong rtc_millis = windows_to_java_time(wt);
958 jlong user_millis = windows_to_java_time(user_time);
959 jlong system_millis = windows_to_java_time(kernel_time);
960 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
961 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
962 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
963 return true;
964 } else {
965 return false;
966 }
967 }
968
969 void os::shutdown() {
970 // allow PerfMemory to attempt cleanup of any persistent resources
971 perfMemory_exit();
972
973 // flush buffered output, finish log files
974 ostream_abort();
975
976 // Check for abort hook
977 abort_hook_t abort_hook = Arguments::abort_hook();
978 if (abort_hook != NULL) {
979 abort_hook();
980 }
981 }
982
983
984 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
985 PMINIDUMP_EXCEPTION_INFORMATION,
986 PMINIDUMP_USER_STREAM_INFORMATION,
987 PMINIDUMP_CALLBACK_INFORMATION);
988
989 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
990 HINSTANCE dbghelp;
991 EXCEPTION_POINTERS ep;
992 MINIDUMP_EXCEPTION_INFORMATION mei;
993 MINIDUMP_EXCEPTION_INFORMATION* pmei;
994
995 HANDLE hProcess = GetCurrentProcess();
996 DWORD processId = GetCurrentProcessId();
997 HANDLE dumpFile;
998 MINIDUMP_TYPE dumpType;
999 static const char* cwd;
1000
1001 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
1002 #ifndef ASSERT
1003 // If running on a client version of Windows and user has not explicitly enabled dumping
1004 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
1005 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
1006 return;
1007 // If running on a server version of Windows and user has explictly disabled dumping
1008 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1009 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1010 return;
1011 }
1012 #else
1013 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1014 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1015 return;
1016 }
1017 #endif
1018
1019 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1020
1021 if (dbghelp == NULL) {
1022 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1023 return;
1024 }
1025
1026 _MiniDumpWriteDump =
1027 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1028 PMINIDUMP_EXCEPTION_INFORMATION,
1029 PMINIDUMP_USER_STREAM_INFORMATION,
1030 PMINIDUMP_CALLBACK_INFORMATION),
1031 GetProcAddress(dbghelp,
1032 "MiniDumpWriteDump"));
1033
1034 if (_MiniDumpWriteDump == NULL) {
1035 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1036 return;
1037 }
1038
1039 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1040
1041 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1042 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1043 #if API_VERSION_NUMBER >= 11
1044 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1045 MiniDumpWithUnloadedModules);
1046 #endif
1047
1048 cwd = get_current_directory(NULL, 0);
1049 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1050 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1051
1052 if (dumpFile == INVALID_HANDLE_VALUE) {
1053 VMError::report_coredump_status("Failed to create file for dumping", false);
1054 return;
1055 }
1056 if (exceptionRecord != NULL && contextRecord != NULL) {
1057 ep.ContextRecord = (PCONTEXT) contextRecord;
1058 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1059
1060 mei.ThreadId = GetCurrentThreadId();
1061 mei.ExceptionPointers = &ep;
1062 pmei = &mei;
1063 } else {
1064 pmei = NULL;
1065 }
1066
1067
1068 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1069 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1070 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1071 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1072 DWORD error = GetLastError();
1073 LPTSTR msgbuf = NULL;
1074
1075 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1076 FORMAT_MESSAGE_FROM_SYSTEM |
1077 FORMAT_MESSAGE_IGNORE_INSERTS,
1078 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1079
1080 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1081 LocalFree(msgbuf);
1082 } else {
1083 // Call to FormatMessage failed, just include the result from GetLastError
1084 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1085 }
1086 VMError::report_coredump_status(buffer, false);
1087 } else {
1088 VMError::report_coredump_status(buffer, true);
1089 }
1090
1091 CloseHandle(dumpFile);
1092 }
1093
1094
1095 void os::abort(bool dump_core) {
1096 os::shutdown();
1097 // no core dump on Windows
1098 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1099 }
1100
1101 // Die immediately, no exit hook, no abort hook, no cleanup.
1102 void os::die() {
1103 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1104 }
1105
1106 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1107 // * dirent_md.c 1.15 00/02/02
1108 //
1109 // The declarations for DIR and struct dirent are in jvm_win32.h.
1110
1111 // Caller must have already run dirname through JVM_NativePath, which removes
1112 // duplicate slashes and converts all instances of '/' into '\\'.
1113
1114 DIR * os::opendir(const char *dirname) {
1115 assert(dirname != NULL, "just checking"); // hotspot change
1116 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1117 DWORD fattr; // hotspot change
1118 char alt_dirname[4] = { 0, 0, 0, 0 };
1119
1120 if (dirp == 0) {
1121 errno = ENOMEM;
1122 return 0;
1123 }
1124
1125 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1126 // as a directory in FindFirstFile(). We detect this case here and
1127 // prepend the current drive name.
1128 //
1129 if (dirname[1] == '\0' && dirname[0] == '\\') {
1130 alt_dirname[0] = _getdrive() + 'A' - 1;
1131 alt_dirname[1] = ':';
1132 alt_dirname[2] = '\\';
1133 alt_dirname[3] = '\0';
1134 dirname = alt_dirname;
1135 }
1136
1137 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1138 if (dirp->path == 0) {
1139 free(dirp, mtInternal);
1140 errno = ENOMEM;
1141 return 0;
1142 }
1143 strcpy(dirp->path, dirname);
1144
1145 fattr = GetFileAttributes(dirp->path);
1146 if (fattr == 0xffffffff) {
1147 free(dirp->path, mtInternal);
1148 free(dirp, mtInternal);
1149 errno = ENOENT;
1150 return 0;
1151 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1152 free(dirp->path, mtInternal);
1153 free(dirp, mtInternal);
1154 errno = ENOTDIR;
1155 return 0;
1156 }
1157
1158 // Append "*.*", or possibly "\\*.*", to path
1159 if (dirp->path[1] == ':' &&
1160 (dirp->path[2] == '\0' ||
1161 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1162 // No '\\' needed for cases like "Z:" or "Z:\"
1163 strcat(dirp->path, "*.*");
1164 } else {
1165 strcat(dirp->path, "\\*.*");
1166 }
1167
1168 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1169 if (dirp->handle == INVALID_HANDLE_VALUE) {
1170 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1171 free(dirp->path, mtInternal);
1172 free(dirp, mtInternal);
1173 errno = EACCES;
1174 return 0;
1175 }
1176 }
1177 return dirp;
1178 }
1179
1180 // parameter dbuf unused on Windows
1181 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1182 assert(dirp != NULL, "just checking"); // hotspot change
1183 if (dirp->handle == INVALID_HANDLE_VALUE) {
1184 return 0;
1185 }
1186
1187 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1188
1189 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1190 if (GetLastError() == ERROR_INVALID_HANDLE) {
1191 errno = EBADF;
1192 return 0;
1193 }
1194 FindClose(dirp->handle);
1195 dirp->handle = INVALID_HANDLE_VALUE;
1196 }
1197
1198 return &dirp->dirent;
1199 }
1200
1201 int os::closedir(DIR *dirp) {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path, mtInternal);
1211 free(dirp, mtInternal);
1212 return 0;
1213 }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1220 return path_buf;
1221 } else {
1222 path_buf[0] = '\0';
1223 return path_buf;
1224 }
1225 }
1226
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1233
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1239
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1244
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0; i < n; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0; i < n; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1290
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1298
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll(address addr) {
1306 HMODULE hmod;
1307 MODULEINFO minfo;
1308
1309 hmod = GetModuleHandle("NTDLL.DLL");
1310 if (hmod == NULL) return false;
1311 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1312 &minfo, sizeof(MODULEINFO))) {
1313 return false;
1314 }
1315
1316 if ((addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1318 return true;
1319 } else {
1320 return false;
1321 }
1322 }
1323 #endif
1324
1325 struct _modinfo {
1326 address addr;
1327 char* full_path; // point to a char buffer
1328 int buflen; // size of the buffer
1329 address base_addr;
1330 };
1331
1332 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1333 address top_address, void * param) {
1334 struct _modinfo *pmod = (struct _modinfo *)param;
1335 if (!pmod) return -1;
1336
1337 if (base_addr <= pmod->addr &&
1338 top_address > pmod->addr) {
1339 // if a buffer is provided, copy path name to the buffer
1340 if (pmod->full_path) {
1341 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1342 }
1343 pmod->base_addr = base_addr;
1344 return 1;
1345 }
1346 return 0;
1347 }
1348
1349 bool os::dll_address_to_library_name(address addr, char* buf,
1350 int buflen, int* offset) {
1351 // buf is not optional, but offset is optional
1352 assert(buf != NULL, "sanity check");
1353
1354 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1355 // return the full path to the DLL file, sometimes it returns path
1356 // to the corresponding PDB file (debug info); sometimes it only
1357 // returns partial path, which makes life painful.
1358
1359 struct _modinfo mi;
1360 mi.addr = addr;
1361 mi.full_path = buf;
1362 mi.buflen = buflen;
1363 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1364 // buf already contains path name
1365 if (offset) *offset = addr - mi.base_addr;
1366 return true;
1367 }
1368
1369 buf[0] = '\0';
1370 if (offset) *offset = -1;
1371 return false;
1372 }
1373
1374 bool os::dll_address_to_function_name(address addr, char *buf,
1375 int buflen, int *offset) {
1376 // buf is not optional, but offset is optional
1377 assert(buf != NULL, "sanity check");
1378
1379 if (Decoder::decode(addr, buf, buflen, offset)) {
1380 return true;
1381 }
1382 if (offset != NULL) *offset = -1;
1383 buf[0] = '\0';
1384 return false;
1385 }
1386
1387 // save the start and end address of jvm.dll into param[0] and param[1]
1388 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1389 address top_address, void * param) {
1390 if (!param) return -1;
1391
1392 if (base_addr <= (address)_locate_jvm_dll &&
1393 top_address > (address)_locate_jvm_dll) {
1394 ((address*)param)[0] = base_addr;
1395 ((address*)param)[1] = top_address;
1396 return 1;
1397 }
1398 return 0;
1399 }
1400
1401 address vm_lib_location[2]; // start and end address of jvm.dll
1402
1403 // check if addr is inside jvm.dll
1404 bool os::address_is_in_vm(address addr) {
1405 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1406 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1407 assert(false, "Can't find jvm module.");
1408 return false;
1409 }
1410 }
1411
1412 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1413 }
1414
1415 // print module info; param is outputStream*
1416 static int _print_module(const char* fname, address base_address,
1417 address top_address, void* param) {
1418 if (!param) return -1;
1419
1420 outputStream* st = (outputStream*)param;
1421
1422 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1423 return 0;
1424 }
1425
1426 // Loads .dll/.so and
1427 // in case of error it checks if .dll/.so was built for the
1428 // same architecture as Hotspot is running on
1429 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1430 void * result = LoadLibrary(name);
1431 if (result != NULL) {
1432 return result;
1433 }
1434
1435 DWORD errcode = GetLastError();
1436 if (errcode == ERROR_MOD_NOT_FOUND) {
1437 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1438 ebuf[ebuflen - 1] = '\0';
1439 return NULL;
1440 }
1441
1442 // Parsing dll below
1443 // If we can read dll-info and find that dll was built
1444 // for an architecture other than Hotspot is running in
1445 // - then print to buffer "DLL was built for a different architecture"
1446 // else call os::lasterror to obtain system error message
1447
1448 // Read system error message into ebuf
1449 // It may or may not be overwritten below (in the for loop and just above)
1450 lasterror(ebuf, (size_t) ebuflen);
1451 ebuf[ebuflen - 1] = '\0';
1452 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1453 if (fd < 0) {
1454 return NULL;
1455 }
1456
1457 uint32_t signature_offset;
1458 uint16_t lib_arch = 0;
1459 bool failed_to_get_lib_arch =
1460 ( // Go to position 3c in the dll
1461 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1462 ||
1463 // Read location of signature
1464 (sizeof(signature_offset) !=
1465 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1466 ||
1467 // Go to COFF File Header in dll
1468 // that is located after "signature" (4 bytes long)
1469 (os::seek_to_file_offset(fd,
1470 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1471 ||
1472 // Read field that contains code of architecture
1473 // that dll was built for
1474 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1475 );
1476
1477 ::close(fd);
1478 if (failed_to_get_lib_arch) {
1479 // file i/o error - report os::lasterror(...) msg
1480 return NULL;
1481 }
1482
1483 typedef struct {
1484 uint16_t arch_code;
1485 char* arch_name;
1486 } arch_t;
1487
1488 static const arch_t arch_array[] = {
1489 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1490 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1491 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1492 };
1493 #if (defined _M_IA64)
1494 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1495 #elif (defined _M_AMD64)
1496 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1497 #elif (defined _M_IX86)
1498 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1499 #else
1500 #error Method os::dll_load requires that one of following \
1501 is defined :_M_IA64,_M_AMD64 or _M_IX86
1502 #endif
1503
1504
1505 // Obtain a string for printf operation
1506 // lib_arch_str shall contain string what platform this .dll was built for
1507 // running_arch_str shall string contain what platform Hotspot was built for
1508 char *running_arch_str = NULL, *lib_arch_str = NULL;
1509 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1510 if (lib_arch == arch_array[i].arch_code) {
1511 lib_arch_str = arch_array[i].arch_name;
1512 }
1513 if (running_arch == arch_array[i].arch_code) {
1514 running_arch_str = arch_array[i].arch_name;
1515 }
1516 }
1517
1518 assert(running_arch_str,
1519 "Didn't find running architecture code in arch_array");
1520
1521 // If the architecture is right
1522 // but some other error took place - report os::lasterror(...) msg
1523 if (lib_arch == running_arch) {
1524 return NULL;
1525 }
1526
1527 if (lib_arch_str != NULL) {
1528 ::_snprintf(ebuf, ebuflen - 1,
1529 "Can't load %s-bit .dll on a %s-bit platform",
1530 lib_arch_str, running_arch_str);
1531 } else {
1532 // don't know what architecture this dll was build for
1533 ::_snprintf(ebuf, ebuflen - 1,
1534 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1535 lib_arch, running_arch_str);
1536 }
1537
1538 return NULL;
1539 }
1540
1541 void os::print_dll_info(outputStream *st) {
1542 st->print_cr("Dynamic libraries:");
1543 get_loaded_modules_info(_print_module, (void *)st);
1544 }
1545
1546 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1547 HANDLE hProcess;
1548
1549 # define MAX_NUM_MODULES 128
1550 HMODULE modules[MAX_NUM_MODULES];
1551 static char filename[MAX_PATH];
1552 int result = 0;
1553
1554 if (!os::PSApiDll::PSApiAvailable()) {
1555 return 0;
1556 }
1557
1558 int pid = os::current_process_id();
1559 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1560 FALSE, pid);
1561 if (hProcess == NULL) return 0;
1562
1563 DWORD size_needed;
1564 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1565 sizeof(modules), &size_needed)) {
1566 CloseHandle(hProcess);
1567 return 0;
1568 }
1569
1570 // number of modules that are currently loaded
1571 int num_modules = size_needed / sizeof(HMODULE);
1572
1573 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1574 // Get Full pathname:
1575 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1576 filename, sizeof(filename))) {
1577 filename[0] = '\0';
1578 }
1579
1580 MODULEINFO modinfo;
1581 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1582 &modinfo, sizeof(modinfo))) {
1583 modinfo.lpBaseOfDll = NULL;
1584 modinfo.SizeOfImage = 0;
1585 }
1586
1587 // Invoke callback function
1588 result = callback(filename, (address)modinfo.lpBaseOfDll,
1589 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1590 if (result) break;
1591 }
1592
1593 CloseHandle(hProcess);
1594 return result;
1595 }
1596
1597 void os::print_os_info_brief(outputStream* st) {
1598 os::print_os_info(st);
1599 }
1600
1601 void os::print_os_info(outputStream* st) {
1602 #ifdef ASSERT
1603 char buffer[1024];
1604 DWORD size = sizeof(buffer);
1605 st->print(" HostName: ");
1606 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1607 st->print("%s", buffer);
1608 } else {
1609 st->print("N/A");
1610 }
1611 #endif
1612 st->print(" OS:");
1613 os::win32::print_windows_version(st);
1614 }
1615
1616 void os::win32::print_windows_version(outputStream* st) {
1617 OSVERSIONINFOEX osvi;
1618 VS_FIXEDFILEINFO *file_info;
1619 TCHAR kernel32_path[MAX_PATH];
1620 UINT len, ret;
1621
1622 // Use the GetVersionEx information to see if we're on a server or
1623 // workstation edition of Windows. Starting with Windows 8.1 we can't
1624 // trust the OS version information returned by this API.
1625 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1626 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1627 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1628 st->print_cr("Call to GetVersionEx failed");
1629 return;
1630 }
1631 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1632
1633 // Get the full path to \Windows\System32\kernel32.dll and use that for
1634 // determining what version of Windows we're running on.
1635 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1636 ret = GetSystemDirectory(kernel32_path, len);
1637 if (ret == 0 || ret > len) {
1638 st->print_cr("Call to GetSystemDirectory failed");
1639 return;
1640 }
1641 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1642
1643 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1644 if (version_size == 0) {
1645 st->print_cr("Call to GetFileVersionInfoSize failed");
1646 return;
1647 }
1648
1649 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1650 if (version_info == NULL) {
1651 st->print_cr("Failed to allocate version_info");
1652 return;
1653 }
1654
1655 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1656 os::free(version_info);
1657 st->print_cr("Call to GetFileVersionInfo failed");
1658 return;
1659 }
1660
1661 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1662 os::free(version_info);
1663 st->print_cr("Call to VerQueryValue failed");
1664 return;
1665 }
1666
1667 int major_version = HIWORD(file_info->dwProductVersionMS);
1668 int minor_version = LOWORD(file_info->dwProductVersionMS);
1669 int build_number = HIWORD(file_info->dwProductVersionLS);
1670 int build_minor = LOWORD(file_info->dwProductVersionLS);
1671 int os_vers = major_version * 1000 + minor_version;
1672 os::free(version_info);
1673
1674 st->print(" Windows ");
1675 switch (os_vers) {
1676
1677 case 6000:
1678 if (is_workstation) {
1679 st->print("Vista");
1680 } else {
1681 st->print("Server 2008");
1682 }
1683 break;
1684
1685 case 6001:
1686 if (is_workstation) {
1687 st->print("7");
1688 } else {
1689 st->print("Server 2008 R2");
1690 }
1691 break;
1692
1693 case 6002:
1694 if (is_workstation) {
1695 st->print("8");
1696 } else {
1697 st->print("Server 2012");
1698 }
1699 break;
1700
1701 case 6003:
1702 if (is_workstation) {
1703 st->print("8.1");
1704 } else {
1705 st->print("Server 2012 R2");
1706 }
1707 break;
1708
1709 case 6004:
1710 if (is_workstation) {
1711 st->print("10");
1712 } else {
1713 // The server version name of Windows 10 is not known at this time
1714 st->print("%d.%d", major_version, minor_version);
1715 }
1716 break;
1717
1718 default:
1719 // Unrecognized windows, print out its major and minor versions
1720 st->print("%d.%d", major_version, minor_version);
1721 break;
1722 }
1723
1724 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1725 // find out whether we are running on 64 bit processor or not
1726 SYSTEM_INFO si;
1727 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1728 os::Kernel32Dll::GetNativeSystemInfo(&si);
1729 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1730 st->print(" , 64 bit");
1731 }
1732
1733 st->print(" Build %d", build_number);
1734 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1735 st->cr();
1736 }
1737
1738 void os::pd_print_cpu_info(outputStream* st) {
1739 // Nothing to do for now.
1740 }
1741
1742 void os::print_memory_info(outputStream* st) {
1743 st->print("Memory:");
1744 st->print(" %dk page", os::vm_page_size()>>10);
1745
1746 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1747 // value if total memory is larger than 4GB
1748 MEMORYSTATUSEX ms;
1749 ms.dwLength = sizeof(ms);
1750 GlobalMemoryStatusEx(&ms);
1751
1752 st->print(", physical %uk", os::physical_memory() >> 10);
1753 st->print("(%uk free)", os::available_memory() >> 10);
1754
1755 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1756 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1757 st->cr();
1758 }
1759
1760 void os::print_siginfo(outputStream *st, void *siginfo) {
1761 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1762 st->print("siginfo:");
1763 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1764
1765 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1766 er->NumberParameters >= 2) {
1767 switch (er->ExceptionInformation[0]) {
1768 case 0: st->print(", reading address"); break;
1769 case 1: st->print(", writing address"); break;
1770 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1771 er->ExceptionInformation[0]);
1772 }
1773 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1774 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1775 er->NumberParameters >= 2 && UseSharedSpaces) {
1776 FileMapInfo* mapinfo = FileMapInfo::current_info();
1777 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1778 st->print("\n\nError accessing class data sharing archive." \
1779 " Mapped file inaccessible during execution, " \
1780 " possible disk/network problem.");
1781 }
1782 } else {
1783 int num = er->NumberParameters;
1784 if (num > 0) {
1785 st->print(", ExceptionInformation=");
1786 for (int i = 0; i < num; i++) {
1787 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1788 }
1789 }
1790 }
1791 st->cr();
1792 }
1793
1794 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1795 // do nothing
1796 }
1797
1798 static char saved_jvm_path[MAX_PATH] = {0};
1799
1800 // Find the full path to the current module, jvm.dll
1801 void os::jvm_path(char *buf, jint buflen) {
1802 // Error checking.
1803 if (buflen < MAX_PATH) {
1804 assert(false, "must use a large-enough buffer");
1805 buf[0] = '\0';
1806 return;
1807 }
1808 // Lazy resolve the path to current module.
1809 if (saved_jvm_path[0] != 0) {
1810 strcpy(buf, saved_jvm_path);
1811 return;
1812 }
1813
1814 buf[0] = '\0';
1815 if (Arguments::sun_java_launcher_is_altjvm()) {
1816 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1817 // for a JAVA_HOME environment variable and fix up the path so it
1818 // looks like jvm.dll is installed there (append a fake suffix
1819 // hotspot/jvm.dll).
1820 char* java_home_var = ::getenv("JAVA_HOME");
1821 if (java_home_var != NULL && java_home_var[0] != 0 &&
1822 strlen(java_home_var) < (size_t)buflen) {
1823 strncpy(buf, java_home_var, buflen);
1824
1825 // determine if this is a legacy image or modules image
1826 // modules image doesn't have "jre" subdirectory
1827 size_t len = strlen(buf);
1828 char* jrebin_p = buf + len;
1829 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1830 if (0 != _access(buf, 0)) {
1831 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1832 }
1833 len = strlen(buf);
1834 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1835 }
1836 }
1837
1838 if (buf[0] == '\0') {
1839 GetModuleFileName(vm_lib_handle, buf, buflen);
1840 }
1841 strncpy(saved_jvm_path, buf, MAX_PATH);
1842 saved_jvm_path[MAX_PATH - 1] = '\0';
1843 }
1844
1845
1846 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1847 #ifndef _WIN64
1848 st->print("_");
1849 #endif
1850 }
1851
1852
1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1854 #ifndef _WIN64
1855 st->print("@%d", args_size * sizeof(int));
1856 #endif
1857 }
1858
1859 // This method is a copy of JDK's sysGetLastErrorString
1860 // from src/windows/hpi/src/system_md.c
1861
1862 size_t os::lasterror(char* buf, size_t len) {
1863 DWORD errval;
1864
1865 if ((errval = GetLastError()) != 0) {
1866 // DOS error
1867 size_t n = (size_t)FormatMessage(
1868 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1869 NULL,
1870 errval,
1871 0,
1872 buf,
1873 (DWORD)len,
1874 NULL);
1875 if (n > 3) {
1876 // Drop final '.', CR, LF
1877 if (buf[n - 1] == '\n') n--;
1878 if (buf[n - 1] == '\r') n--;
1879 if (buf[n - 1] == '.') n--;
1880 buf[n] = '\0';
1881 }
1882 return n;
1883 }
1884
1885 if (errno != 0) {
1886 // C runtime error that has no corresponding DOS error code
1887 const char* s = strerror(errno);
1888 size_t n = strlen(s);
1889 if (n >= len) n = len - 1;
1890 strncpy(buf, s, n);
1891 buf[n] = '\0';
1892 return n;
1893 }
1894
1895 return 0;
1896 }
1897
1898 int os::get_last_error() {
1899 DWORD error = GetLastError();
1900 if (error == 0) {
1901 error = errno;
1902 }
1903 return (int)error;
1904 }
1905
1906 // sun.misc.Signal
1907 // NOTE that this is a workaround for an apparent kernel bug where if
1908 // a signal handler for SIGBREAK is installed then that signal handler
1909 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1910 // See bug 4416763.
1911 static void (*sigbreakHandler)(int) = NULL;
1912
1913 static void UserHandler(int sig, void *siginfo, void *context) {
1914 os::signal_notify(sig);
1915 // We need to reinstate the signal handler each time...
1916 os::signal(sig, (void*)UserHandler);
1917 }
1918
1919 void* os::user_handler() {
1920 return (void*) UserHandler;
1921 }
1922
1923 void* os::signal(int signal_number, void* handler) {
1924 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1925 void (*oldHandler)(int) = sigbreakHandler;
1926 sigbreakHandler = (void (*)(int)) handler;
1927 return (void*) oldHandler;
1928 } else {
1929 return (void*)::signal(signal_number, (void (*)(int))handler);
1930 }
1931 }
1932
1933 void os::signal_raise(int signal_number) {
1934 raise(signal_number);
1935 }
1936
1937 // The Win32 C runtime library maps all console control events other than ^C
1938 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1939 // logoff, and shutdown events. We therefore install our own console handler
1940 // that raises SIGTERM for the latter cases.
1941 //
1942 static BOOL WINAPI consoleHandler(DWORD event) {
1943 switch (event) {
1944 case CTRL_C_EVENT:
1945 if (is_error_reported()) {
1946 // Ctrl-C is pressed during error reporting, likely because the error
1947 // handler fails to abort. Let VM die immediately.
1948 os::die();
1949 }
1950
1951 os::signal_raise(SIGINT);
1952 return TRUE;
1953 break;
1954 case CTRL_BREAK_EVENT:
1955 if (sigbreakHandler != NULL) {
1956 (*sigbreakHandler)(SIGBREAK);
1957 }
1958 return TRUE;
1959 break;
1960 case CTRL_LOGOFF_EVENT: {
1961 // Don't terminate JVM if it is running in a non-interactive session,
1962 // such as a service process.
1963 USEROBJECTFLAGS flags;
1964 HANDLE handle = GetProcessWindowStation();
1965 if (handle != NULL &&
1966 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1967 sizeof(USEROBJECTFLAGS), NULL)) {
1968 // If it is a non-interactive session, let next handler to deal
1969 // with it.
1970 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1971 return FALSE;
1972 }
1973 }
1974 }
1975 case CTRL_CLOSE_EVENT:
1976 case CTRL_SHUTDOWN_EVENT:
1977 os::signal_raise(SIGTERM);
1978 return TRUE;
1979 break;
1980 default:
1981 break;
1982 }
1983 return FALSE;
1984 }
1985
1986 // The following code is moved from os.cpp for making this
1987 // code platform specific, which it is by its very nature.
1988
1989 // Return maximum OS signal used + 1 for internal use only
1990 // Used as exit signal for signal_thread
1991 int os::sigexitnum_pd() {
1992 return NSIG;
1993 }
1994
1995 // a counter for each possible signal value, including signal_thread exit signal
1996 static volatile jint pending_signals[NSIG+1] = { 0 };
1997 static HANDLE sig_sem = NULL;
1998
1999 void os::signal_init_pd() {
2000 // Initialize signal structures
2001 memset((void*)pending_signals, 0, sizeof(pending_signals));
2002
2003 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2004
2005 // Programs embedding the VM do not want it to attempt to receive
2006 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2007 // shutdown hooks mechanism introduced in 1.3. For example, when
2008 // the VM is run as part of a Windows NT service (i.e., a servlet
2009 // engine in a web server), the correct behavior is for any console
2010 // control handler to return FALSE, not TRUE, because the OS's
2011 // "final" handler for such events allows the process to continue if
2012 // it is a service (while terminating it if it is not a service).
2013 // To make this behavior uniform and the mechanism simpler, we
2014 // completely disable the VM's usage of these console events if -Xrs
2015 // (=ReduceSignalUsage) is specified. This means, for example, that
2016 // the CTRL-BREAK thread dump mechanism is also disabled in this
2017 // case. See bugs 4323062, 4345157, and related bugs.
2018
2019 if (!ReduceSignalUsage) {
2020 // Add a CTRL-C handler
2021 SetConsoleCtrlHandler(consoleHandler, TRUE);
2022 }
2023 }
2024
2025 void os::signal_notify(int signal_number) {
2026 BOOL ret;
2027 if (sig_sem != NULL) {
2028 Atomic::inc(&pending_signals[signal_number]);
2029 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2030 assert(ret != 0, "ReleaseSemaphore() failed");
2031 }
2032 }
2033
2034 static int check_pending_signals(bool wait_for_signal) {
2035 DWORD ret;
2036 while (true) {
2037 for (int i = 0; i < NSIG + 1; i++) {
2038 jint n = pending_signals[i];
2039 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2040 return i;
2041 }
2042 }
2043 if (!wait_for_signal) {
2044 return -1;
2045 }
2046
2047 JavaThread *thread = JavaThread::current();
2048
2049 ThreadBlockInVM tbivm(thread);
2050
2051 bool threadIsSuspended;
2052 do {
2053 thread->set_suspend_equivalent();
2054 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2055 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2056 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2057
2058 // were we externally suspended while we were waiting?
2059 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2060 if (threadIsSuspended) {
2061 // The semaphore has been incremented, but while we were waiting
2062 // another thread suspended us. We don't want to continue running
2063 // while suspended because that would surprise the thread that
2064 // suspended us.
2065 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2066 assert(ret != 0, "ReleaseSemaphore() failed");
2067
2068 thread->java_suspend_self();
2069 }
2070 } while (threadIsSuspended);
2071 }
2072 }
2073
2074 int os::signal_lookup() {
2075 return check_pending_signals(false);
2076 }
2077
2078 int os::signal_wait() {
2079 return check_pending_signals(true);
2080 }
2081
2082 // Implicit OS exception handling
2083
2084 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2085 address handler) {
2086 JavaThread* thread = JavaThread::current();
2087 // Save pc in thread
2088 #ifdef _M_IA64
2089 // Do not blow up if no thread info available.
2090 if (thread) {
2091 // Saving PRECISE pc (with slot information) in thread.
2092 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2093 // Convert precise PC into "Unix" format
2094 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2095 thread->set_saved_exception_pc((address)precise_pc);
2096 }
2097 // Set pc to handler
2098 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2099 // Clear out psr.ri (= Restart Instruction) in order to continue
2100 // at the beginning of the target bundle.
2101 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2102 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2103 #elif _M_AMD64
2104 // Do not blow up if no thread info available.
2105 if (thread) {
2106 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2107 }
2108 // Set pc to handler
2109 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2110 #else
2111 // Do not blow up if no thread info available.
2112 if (thread) {
2113 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2114 }
2115 // Set pc to handler
2116 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2117 #endif
2118
2119 // Continue the execution
2120 return EXCEPTION_CONTINUE_EXECUTION;
2121 }
2122
2123
2124 // Used for PostMortemDump
2125 extern "C" void safepoints();
2126 extern "C" void find(int x);
2127 extern "C" void events();
2128
2129 // According to Windows API documentation, an illegal instruction sequence should generate
2130 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2131 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2132 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2133
2134 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2135
2136 // From "Execution Protection in the Windows Operating System" draft 0.35
2137 // Once a system header becomes available, the "real" define should be
2138 // included or copied here.
2139 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2140
2141 // Handle NAT Bit consumption on IA64.
2142 #ifdef _M_IA64
2143 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2144 #endif
2145
2146 // Windows Vista/2008 heap corruption check
2147 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2148
2149 #define def_excpt(val) #val, val
2150
2151 struct siglabel {
2152 char *name;
2153 int number;
2154 };
2155
2156 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2157 // C++ compiler contain this error code. Because this is a compiler-generated
2158 // error, the code is not listed in the Win32 API header files.
2159 // The code is actually a cryptic mnemonic device, with the initial "E"
2160 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2161 // ASCII values of "msc".
2162
2163 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2164
2165
2166 struct siglabel exceptlabels[] = {
2167 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2168 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2169 def_excpt(EXCEPTION_BREAKPOINT),
2170 def_excpt(EXCEPTION_SINGLE_STEP),
2171 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2172 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2173 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2174 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2175 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2176 def_excpt(EXCEPTION_FLT_OVERFLOW),
2177 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2178 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2179 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2180 def_excpt(EXCEPTION_INT_OVERFLOW),
2181 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2182 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2183 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2184 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2185 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2186 def_excpt(EXCEPTION_STACK_OVERFLOW),
2187 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2188 def_excpt(EXCEPTION_GUARD_PAGE),
2189 def_excpt(EXCEPTION_INVALID_HANDLE),
2190 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2191 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2192 #ifdef _M_IA64
2193 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2194 #endif
2195 NULL, 0
2196 };
2197
2198 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2199 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2200 if (exceptlabels[i].number == exception_code) {
2201 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2202 return buf;
2203 }
2204 }
2205
2206 return NULL;
2207 }
2208
2209 //-----------------------------------------------------------------------------
2210 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2211 // handle exception caused by idiv; should only happen for -MinInt/-1
2212 // (division by zero is handled explicitly)
2213 #ifdef _M_IA64
2214 assert(0, "Fix Handle_IDiv_Exception");
2215 #elif _M_AMD64
2216 PCONTEXT ctx = exceptionInfo->ContextRecord;
2217 address pc = (address)ctx->Rip;
2218 assert(pc[0] == 0xF7, "not an idiv opcode");
2219 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2220 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2221 // set correct result values and continue after idiv instruction
2222 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2223 ctx->Rax = (DWORD)min_jint; // result
2224 ctx->Rdx = (DWORD)0; // remainder
2225 // Continue the execution
2226 #else
2227 PCONTEXT ctx = exceptionInfo->ContextRecord;
2228 address pc = (address)ctx->Eip;
2229 assert(pc[0] == 0xF7, "not an idiv opcode");
2230 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2231 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2232 // set correct result values and continue after idiv instruction
2233 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2234 ctx->Eax = (DWORD)min_jint; // result
2235 ctx->Edx = (DWORD)0; // remainder
2236 // Continue the execution
2237 #endif
2238 return EXCEPTION_CONTINUE_EXECUTION;
2239 }
2240
2241 //-----------------------------------------------------------------------------
2242 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2243 PCONTEXT ctx = exceptionInfo->ContextRecord;
2244 #ifndef _WIN64
2245 // handle exception caused by native method modifying control word
2246 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2247
2248 switch (exception_code) {
2249 case EXCEPTION_FLT_DENORMAL_OPERAND:
2250 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2251 case EXCEPTION_FLT_INEXACT_RESULT:
2252 case EXCEPTION_FLT_INVALID_OPERATION:
2253 case EXCEPTION_FLT_OVERFLOW:
2254 case EXCEPTION_FLT_STACK_CHECK:
2255 case EXCEPTION_FLT_UNDERFLOW:
2256 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2257 if (fp_control_word != ctx->FloatSave.ControlWord) {
2258 // Restore FPCW and mask out FLT exceptions
2259 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2260 // Mask out pending FLT exceptions
2261 ctx->FloatSave.StatusWord &= 0xffffff00;
2262 return EXCEPTION_CONTINUE_EXECUTION;
2263 }
2264 }
2265
2266 if (prev_uef_handler != NULL) {
2267 // We didn't handle this exception so pass it to the previous
2268 // UnhandledExceptionFilter.
2269 return (prev_uef_handler)(exceptionInfo);
2270 }
2271 #else // !_WIN64
2272 // On Windows, the mxcsr control bits are non-volatile across calls
2273 // See also CR 6192333
2274 //
2275 jint MxCsr = INITIAL_MXCSR;
2276 // we can't use StubRoutines::addr_mxcsr_std()
2277 // because in Win64 mxcsr is not saved there
2278 if (MxCsr != ctx->MxCsr) {
2279 ctx->MxCsr = MxCsr;
2280 return EXCEPTION_CONTINUE_EXECUTION;
2281 }
2282 #endif // !_WIN64
2283
2284 return EXCEPTION_CONTINUE_SEARCH;
2285 }
2286
2287 static inline void report_error(Thread* t, DWORD exception_code,
2288 address addr, void* siginfo, void* context) {
2289 VMError err(t, exception_code, addr, siginfo, context);
2290 err.report_and_die();
2291
2292 // If UseOsErrorReporting, this will return here and save the error file
2293 // somewhere where we can find it in the minidump.
2294 }
2295
2296 //-----------------------------------------------------------------------------
2297 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2298 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2299 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2300 #ifdef _M_IA64
2301 // On Itanium, we need the "precise pc", which has the slot number coded
2302 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2303 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2304 // Convert the pc to "Unix format", which has the slot number coded
2305 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2306 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2307 // information is saved in the Unix format.
2308 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2309 #elif _M_AMD64
2310 address pc = (address) exceptionInfo->ContextRecord->Rip;
2311 #else
2312 address pc = (address) exceptionInfo->ContextRecord->Eip;
2313 #endif
2314 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2315
2316 // Handle SafeFetch32 and SafeFetchN exceptions.
2317 if (StubRoutines::is_safefetch_fault(pc)) {
2318 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2319 }
2320
2321 #ifndef _WIN64
2322 // Execution protection violation - win32 running on AMD64 only
2323 // Handled first to avoid misdiagnosis as a "normal" access violation;
2324 // This is safe to do because we have a new/unique ExceptionInformation
2325 // code for this condition.
2326 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2327 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2328 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2329 address addr = (address) exceptionRecord->ExceptionInformation[1];
2330
2331 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2332 int page_size = os::vm_page_size();
2333
2334 // Make sure the pc and the faulting address are sane.
2335 //
2336 // If an instruction spans a page boundary, and the page containing
2337 // the beginning of the instruction is executable but the following
2338 // page is not, the pc and the faulting address might be slightly
2339 // different - we still want to unguard the 2nd page in this case.
2340 //
2341 // 15 bytes seems to be a (very) safe value for max instruction size.
2342 bool pc_is_near_addr =
2343 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2344 bool instr_spans_page_boundary =
2345 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2346 (intptr_t) page_size) > 0);
2347
2348 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2349 static volatile address last_addr =
2350 (address) os::non_memory_address_word();
2351
2352 // In conservative mode, don't unguard unless the address is in the VM
2353 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2354 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2355
2356 // Set memory to RWX and retry
2357 address page_start =
2358 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2359 bool res = os::protect_memory((char*) page_start, page_size,
2360 os::MEM_PROT_RWX);
2361
2362 if (PrintMiscellaneous && Verbose) {
2363 char buf[256];
2364 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2365 "at " INTPTR_FORMAT
2366 ", unguarding " INTPTR_FORMAT ": %s", addr,
2367 page_start, (res ? "success" : strerror(errno)));
2368 tty->print_raw_cr(buf);
2369 }
2370
2371 // Set last_addr so if we fault again at the same address, we don't
2372 // end up in an endless loop.
2373 //
2374 // There are two potential complications here. Two threads trapping
2375 // at the same address at the same time could cause one of the
2376 // threads to think it already unguarded, and abort the VM. Likely
2377 // very rare.
2378 //
2379 // The other race involves two threads alternately trapping at
2380 // different addresses and failing to unguard the page, resulting in
2381 // an endless loop. This condition is probably even more unlikely
2382 // than the first.
2383 //
2384 // Although both cases could be avoided by using locks or thread
2385 // local last_addr, these solutions are unnecessary complication:
2386 // this handler is a best-effort safety net, not a complete solution.
2387 // It is disabled by default and should only be used as a workaround
2388 // in case we missed any no-execute-unsafe VM code.
2389
2390 last_addr = addr;
2391
2392 return EXCEPTION_CONTINUE_EXECUTION;
2393 }
2394 }
2395
2396 // Last unguard failed or not unguarding
2397 tty->print_raw_cr("Execution protection violation");
2398 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2399 exceptionInfo->ContextRecord);
2400 return EXCEPTION_CONTINUE_SEARCH;
2401 }
2402 }
2403 #endif // _WIN64
2404
2405 // Check to see if we caught the safepoint code in the
2406 // process of write protecting the memory serialization page.
2407 // It write enables the page immediately after protecting it
2408 // so just return.
2409 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2410 JavaThread* thread = (JavaThread*) t;
2411 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2412 address addr = (address) exceptionRecord->ExceptionInformation[1];
2413 if (os::is_memory_serialize_page(thread, addr)) {
2414 // Block current thread until the memory serialize page permission restored.
2415 os::block_on_serialize_page_trap();
2416 return EXCEPTION_CONTINUE_EXECUTION;
2417 }
2418 }
2419
2420 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2421 VM_Version::is_cpuinfo_segv_addr(pc)) {
2422 // Verify that OS save/restore AVX registers.
2423 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2424 }
2425
2426 if (t != NULL && t->is_Java_thread()) {
2427 JavaThread* thread = (JavaThread*) t;
2428 bool in_java = thread->thread_state() == _thread_in_Java;
2429
2430 // Handle potential stack overflows up front.
2431 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2432 if (os::uses_stack_guard_pages()) {
2433 #ifdef _M_IA64
2434 // Use guard page for register stack.
2435 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2436 address addr = (address) exceptionRecord->ExceptionInformation[1];
2437 // Check for a register stack overflow on Itanium
2438 if (thread->addr_inside_register_stack_red_zone(addr)) {
2439 // Fatal red zone violation happens if the Java program
2440 // catches a StackOverflow error and does so much processing
2441 // that it runs beyond the unprotected yellow guard zone. As
2442 // a result, we are out of here.
2443 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2444 } else if(thread->addr_inside_register_stack(addr)) {
2445 // Disable the yellow zone which sets the state that
2446 // we've got a stack overflow problem.
2447 if (thread->stack_yellow_zone_enabled()) {
2448 thread->disable_stack_yellow_zone();
2449 }
2450 // Give us some room to process the exception.
2451 thread->disable_register_stack_guard();
2452 // Tracing with +Verbose.
2453 if (Verbose) {
2454 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2455 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2456 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2457 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2458 thread->register_stack_base(),
2459 thread->register_stack_base() + thread->stack_size());
2460 }
2461
2462 // Reguard the permanent register stack red zone just to be sure.
2463 // We saw Windows silently disabling this without telling us.
2464 thread->enable_register_stack_red_zone();
2465
2466 return Handle_Exception(exceptionInfo,
2467 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2468 }
2469 #endif
2470 if (thread->stack_yellow_zone_enabled()) {
2471 // Yellow zone violation. The o/s has unprotected the first yellow
2472 // zone page for us. Note: must call disable_stack_yellow_zone to
2473 // update the enabled status, even if the zone contains only one page.
2474 thread->disable_stack_yellow_zone();
2475 // If not in java code, return and hope for the best.
2476 return in_java
2477 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2478 : EXCEPTION_CONTINUE_EXECUTION;
2479 } else {
2480 // Fatal red zone violation.
2481 thread->disable_stack_red_zone();
2482 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2483 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2484 exceptionInfo->ContextRecord);
2485 return EXCEPTION_CONTINUE_SEARCH;
2486 }
2487 } else if (in_java) {
2488 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2489 // a one-time-only guard page, which it has released to us. The next
2490 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2491 return Handle_Exception(exceptionInfo,
2492 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2493 } else {
2494 // Can only return and hope for the best. Further stack growth will
2495 // result in an ACCESS_VIOLATION.
2496 return EXCEPTION_CONTINUE_EXECUTION;
2497 }
2498 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2499 // Either stack overflow or null pointer exception.
2500 if (in_java) {
2501 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2502 address addr = (address) exceptionRecord->ExceptionInformation[1];
2503 address stack_end = thread->stack_base() - thread->stack_size();
2504 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2505 // Stack overflow.
2506 assert(!os::uses_stack_guard_pages(),
2507 "should be caught by red zone code above.");
2508 return Handle_Exception(exceptionInfo,
2509 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2510 }
2511 // Check for safepoint polling and implicit null
2512 // We only expect null pointers in the stubs (vtable)
2513 // the rest are checked explicitly now.
2514 CodeBlob* cb = CodeCache::find_blob(pc);
2515 if (cb != NULL) {
2516 if (os::is_poll_address(addr)) {
2517 address stub = SharedRuntime::get_poll_stub(pc);
2518 return Handle_Exception(exceptionInfo, stub);
2519 }
2520 }
2521 {
2522 #ifdef _WIN64
2523 // If it's a legal stack address map the entire region in
2524 //
2525 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2526 address addr = (address) exceptionRecord->ExceptionInformation[1];
2527 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2528 addr = (address)((uintptr_t)addr &
2529 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2530 os::commit_memory((char *)addr, thread->stack_base() - addr,
2531 !ExecMem);
2532 return EXCEPTION_CONTINUE_EXECUTION;
2533 } else
2534 #endif
2535 {
2536 // Null pointer exception.
2537 #ifdef _M_IA64
2538 // Process implicit null checks in compiled code. Note: Implicit null checks
2539 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2540 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2541 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2542 // Handle implicit null check in UEP method entry
2543 if (cb && (cb->is_frame_complete_at(pc) ||
2544 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2545 if (Verbose) {
2546 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2547 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2548 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2549 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2550 *(bundle_start + 1), *bundle_start);
2551 }
2552 return Handle_Exception(exceptionInfo,
2553 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2554 }
2555 }
2556
2557 // Implicit null checks were processed above. Hence, we should not reach
2558 // here in the usual case => die!
2559 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2560 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2561 exceptionInfo->ContextRecord);
2562 return EXCEPTION_CONTINUE_SEARCH;
2563
2564 #else // !IA64
2565
2566 // Windows 98 reports faulting addresses incorrectly
2567 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2568 !os::win32::is_nt()) {
2569 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2570 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2571 }
2572 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2573 exceptionInfo->ContextRecord);
2574 return EXCEPTION_CONTINUE_SEARCH;
2575 #endif
2576 }
2577 }
2578 }
2579
2580 #ifdef _WIN64
2581 // Special care for fast JNI field accessors.
2582 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2583 // in and the heap gets shrunk before the field access.
2584 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2585 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2586 if (addr != (address)-1) {
2587 return Handle_Exception(exceptionInfo, addr);
2588 }
2589 }
2590 #endif
2591
2592 // Stack overflow or null pointer exception in native code.
2593 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2594 exceptionInfo->ContextRecord);
2595 return EXCEPTION_CONTINUE_SEARCH;
2596 } // /EXCEPTION_ACCESS_VIOLATION
2597 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2598 #if defined _M_IA64
2599 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2600 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2601 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2602
2603 // Compiled method patched to be non entrant? Following conditions must apply:
2604 // 1. must be first instruction in bundle
2605 // 2. must be a break instruction with appropriate code
2606 if ((((uint64_t) pc & 0x0F) == 0) &&
2607 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2608 return Handle_Exception(exceptionInfo,
2609 (address)SharedRuntime::get_handle_wrong_method_stub());
2610 }
2611 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2612 #endif
2613
2614
2615 if (in_java) {
2616 switch (exception_code) {
2617 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2618 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2619
2620 case EXCEPTION_INT_OVERFLOW:
2621 return Handle_IDiv_Exception(exceptionInfo);
2622
2623 } // switch
2624 }
2625 if (((thread->thread_state() == _thread_in_Java) ||
2626 (thread->thread_state() == _thread_in_native)) &&
2627 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2628 LONG result=Handle_FLT_Exception(exceptionInfo);
2629 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2630 }
2631 }
2632
2633 if (exception_code != EXCEPTION_BREAKPOINT) {
2634 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2635 exceptionInfo->ContextRecord);
2636 }
2637 return EXCEPTION_CONTINUE_SEARCH;
2638 }
2639
2640 #ifndef _WIN64
2641 // Special care for fast JNI accessors.
2642 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2643 // the heap gets shrunk before the field access.
2644 // Need to install our own structured exception handler since native code may
2645 // install its own.
2646 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2647 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2648 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2649 address pc = (address) exceptionInfo->ContextRecord->Eip;
2650 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2651 if (addr != (address)-1) {
2652 return Handle_Exception(exceptionInfo, addr);
2653 }
2654 }
2655 return EXCEPTION_CONTINUE_SEARCH;
2656 }
2657
2658 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2659 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2660 jobject obj, \
2661 jfieldID fieldID) { \
2662 __try { \
2663 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2664 obj, \
2665 fieldID); \
2666 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2667 _exception_info())) { \
2668 } \
2669 return 0; \
2670 }
2671
2672 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2673 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2674 DEFINE_FAST_GETFIELD(jchar, char, Char)
2675 DEFINE_FAST_GETFIELD(jshort, short, Short)
2676 DEFINE_FAST_GETFIELD(jint, int, Int)
2677 DEFINE_FAST_GETFIELD(jlong, long, Long)
2678 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2679 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2680
2681 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2682 switch (type) {
2683 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2684 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2685 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2686 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2687 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2688 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2689 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2690 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2691 default: ShouldNotReachHere();
2692 }
2693 return (address)-1;
2694 }
2695 #endif
2696
2697 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2698 // Install a win32 structured exception handler around the test
2699 // function call so the VM can generate an error dump if needed.
2700 __try {
2701 (*funcPtr)();
2702 } __except(topLevelExceptionFilter(
2703 (_EXCEPTION_POINTERS*)_exception_info())) {
2704 // Nothing to do.
2705 }
2706 }
2707
2708 // Virtual Memory
2709
2710 int os::vm_page_size() { return os::win32::vm_page_size(); }
2711 int os::vm_allocation_granularity() {
2712 return os::win32::vm_allocation_granularity();
2713 }
2714
2715 // Windows large page support is available on Windows 2003. In order to use
2716 // large page memory, the administrator must first assign additional privilege
2717 // to the user:
2718 // + select Control Panel -> Administrative Tools -> Local Security Policy
2719 // + select Local Policies -> User Rights Assignment
2720 // + double click "Lock pages in memory", add users and/or groups
2721 // + reboot
2722 // Note the above steps are needed for administrator as well, as administrators
2723 // by default do not have the privilege to lock pages in memory.
2724 //
2725 // Note about Windows 2003: although the API supports committing large page
2726 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2727 // scenario, I found through experiment it only uses large page if the entire
2728 // memory region is reserved and committed in a single VirtualAlloc() call.
2729 // This makes Windows large page support more or less like Solaris ISM, in
2730 // that the entire heap must be committed upfront. This probably will change
2731 // in the future, if so the code below needs to be revisited.
2732
2733 #ifndef MEM_LARGE_PAGES
2734 #define MEM_LARGE_PAGES 0x20000000
2735 #endif
2736
2737 static HANDLE _hProcess;
2738 static HANDLE _hToken;
2739
2740 // Container for NUMA node list info
2741 class NUMANodeListHolder {
2742 private:
2743 int *_numa_used_node_list; // allocated below
2744 int _numa_used_node_count;
2745
2746 void free_node_list() {
2747 if (_numa_used_node_list != NULL) {
2748 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2749 }
2750 }
2751
2752 public:
2753 NUMANodeListHolder() {
2754 _numa_used_node_count = 0;
2755 _numa_used_node_list = NULL;
2756 // do rest of initialization in build routine (after function pointers are set up)
2757 }
2758
2759 ~NUMANodeListHolder() {
2760 free_node_list();
2761 }
2762
2763 bool build() {
2764 DWORD_PTR proc_aff_mask;
2765 DWORD_PTR sys_aff_mask;
2766 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2767 ULONG highest_node_number;
2768 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2769 free_node_list();
2770 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2771 for (unsigned int i = 0; i <= highest_node_number; i++) {
2772 ULONGLONG proc_mask_numa_node;
2773 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2774 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2775 _numa_used_node_list[_numa_used_node_count++] = i;
2776 }
2777 }
2778 return (_numa_used_node_count > 1);
2779 }
2780
2781 int get_count() { return _numa_used_node_count; }
2782 int get_node_list_entry(int n) {
2783 // for indexes out of range, returns -1
2784 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2785 }
2786
2787 } numa_node_list_holder;
2788
2789
2790
2791 static size_t _large_page_size = 0;
2792
2793 static bool resolve_functions_for_large_page_init() {
2794 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2795 os::Advapi32Dll::AdvapiAvailable();
2796 }
2797
2798 static bool request_lock_memory_privilege() {
2799 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2800 os::current_process_id());
2801
2802 LUID luid;
2803 if (_hProcess != NULL &&
2804 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2805 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2806
2807 TOKEN_PRIVILEGES tp;
2808 tp.PrivilegeCount = 1;
2809 tp.Privileges[0].Luid = luid;
2810 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2811
2812 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2813 // privilege. Check GetLastError() too. See MSDN document.
2814 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2815 (GetLastError() == ERROR_SUCCESS)) {
2816 return true;
2817 }
2818 }
2819
2820 return false;
2821 }
2822
2823 static void cleanup_after_large_page_init() {
2824 if (_hProcess) CloseHandle(_hProcess);
2825 _hProcess = NULL;
2826 if (_hToken) CloseHandle(_hToken);
2827 _hToken = NULL;
2828 }
2829
2830 static bool numa_interleaving_init() {
2831 bool success = false;
2832 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2833
2834 // print a warning if UseNUMAInterleaving flag is specified on command line
2835 bool warn_on_failure = use_numa_interleaving_specified;
2836 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2837
2838 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2839 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2840 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2841
2842 if (os::Kernel32Dll::NumaCallsAvailable()) {
2843 if (numa_node_list_holder.build()) {
2844 if (PrintMiscellaneous && Verbose) {
2845 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2846 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2847 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2848 }
2849 tty->print("\n");
2850 }
2851 success = true;
2852 } else {
2853 WARN("Process does not cover multiple NUMA nodes.");
2854 }
2855 } else {
2856 WARN("NUMA Interleaving is not supported by the operating system.");
2857 }
2858 if (!success) {
2859 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2860 }
2861 return success;
2862 #undef WARN
2863 }
2864
2865 // this routine is used whenever we need to reserve a contiguous VA range
2866 // but we need to make separate VirtualAlloc calls for each piece of the range
2867 // Reasons for doing this:
2868 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2869 // * UseNUMAInterleaving requires a separate node for each piece
2870 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2871 DWORD prot,
2872 bool should_inject_error = false) {
2873 char * p_buf;
2874 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2875 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2876 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2877
2878 // first reserve enough address space in advance since we want to be
2879 // able to break a single contiguous virtual address range into multiple
2880 // large page commits but WS2003 does not allow reserving large page space
2881 // so we just use 4K pages for reserve, this gives us a legal contiguous
2882 // address space. then we will deallocate that reservation, and re alloc
2883 // using large pages
2884 const size_t size_of_reserve = bytes + chunk_size;
2885 if (bytes > size_of_reserve) {
2886 // Overflowed.
2887 return NULL;
2888 }
2889 p_buf = (char *) VirtualAlloc(addr,
2890 size_of_reserve, // size of Reserve
2891 MEM_RESERVE,
2892 PAGE_READWRITE);
2893 // If reservation failed, return NULL
2894 if (p_buf == NULL) return NULL;
2895 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2896 os::release_memory(p_buf, bytes + chunk_size);
2897
2898 // we still need to round up to a page boundary (in case we are using large pages)
2899 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2900 // instead we handle this in the bytes_to_rq computation below
2901 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2902
2903 // now go through and allocate one chunk at a time until all bytes are
2904 // allocated
2905 size_t bytes_remaining = bytes;
2906 // An overflow of align_size_up() would have been caught above
2907 // in the calculation of size_of_reserve.
2908 char * next_alloc_addr = p_buf;
2909 HANDLE hProc = GetCurrentProcess();
2910
2911 #ifdef ASSERT
2912 // Variable for the failure injection
2913 long ran_num = os::random();
2914 size_t fail_after = ran_num % bytes;
2915 #endif
2916
2917 int count=0;
2918 while (bytes_remaining) {
2919 // select bytes_to_rq to get to the next chunk_size boundary
2920
2921 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2922 // Note allocate and commit
2923 char * p_new;
2924
2925 #ifdef ASSERT
2926 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2927 #else
2928 const bool inject_error_now = false;
2929 #endif
2930
2931 if (inject_error_now) {
2932 p_new = NULL;
2933 } else {
2934 if (!UseNUMAInterleaving) {
2935 p_new = (char *) VirtualAlloc(next_alloc_addr,
2936 bytes_to_rq,
2937 flags,
2938 prot);
2939 } else {
2940 // get the next node to use from the used_node_list
2941 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2942 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2943 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2944 next_alloc_addr,
2945 bytes_to_rq,
2946 flags,
2947 prot,
2948 node);
2949 }
2950 }
2951
2952 if (p_new == NULL) {
2953 // Free any allocated pages
2954 if (next_alloc_addr > p_buf) {
2955 // Some memory was committed so release it.
2956 size_t bytes_to_release = bytes - bytes_remaining;
2957 // NMT has yet to record any individual blocks, so it
2958 // need to create a dummy 'reserve' record to match
2959 // the release.
2960 MemTracker::record_virtual_memory_reserve((address)p_buf,
2961 bytes_to_release, CALLER_PC);
2962 os::release_memory(p_buf, bytes_to_release);
2963 }
2964 #ifdef ASSERT
2965 if (should_inject_error) {
2966 if (TracePageSizes && Verbose) {
2967 tty->print_cr("Reserving pages individually failed.");
2968 }
2969 }
2970 #endif
2971 return NULL;
2972 }
2973
2974 bytes_remaining -= bytes_to_rq;
2975 next_alloc_addr += bytes_to_rq;
2976 count++;
2977 }
2978 // Although the memory is allocated individually, it is returned as one.
2979 // NMT records it as one block.
2980 if ((flags & MEM_COMMIT) != 0) {
2981 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2982 } else {
2983 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2984 }
2985
2986 // made it this far, success
2987 return p_buf;
2988 }
2989
2990
2991
2992 void os::large_page_init() {
2993 if (!UseLargePages) return;
2994
2995 // print a warning if any large page related flag is specified on command line
2996 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2997 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2998 bool success = false;
2999
3000 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3001 if (resolve_functions_for_large_page_init()) {
3002 if (request_lock_memory_privilege()) {
3003 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3004 if (s) {
3005 #if defined(IA32) || defined(AMD64)
3006 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3007 WARN("JVM cannot use large pages bigger than 4mb.");
3008 } else {
3009 #endif
3010 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3011 _large_page_size = LargePageSizeInBytes;
3012 } else {
3013 _large_page_size = s;
3014 }
3015 success = true;
3016 #if defined(IA32) || defined(AMD64)
3017 }
3018 #endif
3019 } else {
3020 WARN("Large page is not supported by the processor.");
3021 }
3022 } else {
3023 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3024 }
3025 } else {
3026 WARN("Large page is not supported by the operating system.");
3027 }
3028 #undef WARN
3029
3030 const size_t default_page_size = (size_t) vm_page_size();
3031 if (success && _large_page_size > default_page_size) {
3032 _page_sizes[0] = _large_page_size;
3033 _page_sizes[1] = default_page_size;
3034 _page_sizes[2] = 0;
3035 }
3036
3037 cleanup_after_large_page_init();
3038 UseLargePages = success;
3039 }
3040
3041 // On win32, one cannot release just a part of reserved memory, it's an
3042 // all or nothing deal. When we split a reservation, we must break the
3043 // reservation into two reservations.
3044 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3045 bool realloc) {
3046 if (size > 0) {
3047 release_memory(base, size);
3048 if (realloc) {
3049 reserve_memory(split, base);
3050 }
3051 if (size != split) {
3052 reserve_memory(size - split, base + split);
3053 }
3054 }
3055 }
3056
3057 // Multiple threads can race in this code but it's not possible to unmap small sections of
3058 // virtual space to get requested alignment, like posix-like os's.
3059 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3060 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3061 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3062 "Alignment must be a multiple of allocation granularity (page size)");
3063 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3064
3065 size_t extra_size = size + alignment;
3066 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3067
3068 char* aligned_base = NULL;
3069
3070 do {
3071 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3072 if (extra_base == NULL) {
3073 return NULL;
3074 }
3075 // Do manual alignment
3076 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3077
3078 os::release_memory(extra_base, extra_size);
3079
3080 aligned_base = os::reserve_memory(size, aligned_base);
3081
3082 } while (aligned_base == NULL);
3083
3084 return aligned_base;
3085 }
3086
3087 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3088 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3089 "reserve alignment");
3090 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3091 char* res;
3092 // note that if UseLargePages is on, all the areas that require interleaving
3093 // will go thru reserve_memory_special rather than thru here.
3094 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3095 if (!use_individual) {
3096 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3097 } else {
3098 elapsedTimer reserveTimer;
3099 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3100 // in numa interleaving, we have to allocate pages individually
3101 // (well really chunks of NUMAInterleaveGranularity size)
3102 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3103 if (res == NULL) {
3104 warning("NUMA page allocation failed");
3105 }
3106 if (Verbose && PrintMiscellaneous) {
3107 reserveTimer.stop();
3108 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3109 reserveTimer.milliseconds(), reserveTimer.ticks());
3110 }
3111 }
3112 assert(res == NULL || addr == NULL || addr == res,
3113 "Unexpected address from reserve.");
3114
3115 return res;
3116 }
3117
3118 // Reserve memory at an arbitrary address, only if that area is
3119 // available (and not reserved for something else).
3120 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3121 // Windows os::reserve_memory() fails of the requested address range is
3122 // not avilable.
3123 return reserve_memory(bytes, requested_addr);
3124 }
3125
3126 size_t os::large_page_size() {
3127 return _large_page_size;
3128 }
3129
3130 bool os::can_commit_large_page_memory() {
3131 // Windows only uses large page memory when the entire region is reserved
3132 // and committed in a single VirtualAlloc() call. This may change in the
3133 // future, but with Windows 2003 it's not possible to commit on demand.
3134 return false;
3135 }
3136
3137 bool os::can_execute_large_page_memory() {
3138 return true;
3139 }
3140
3141 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3142 bool exec) {
3143 assert(UseLargePages, "only for large pages");
3144
3145 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3146 return NULL; // Fallback to small pages.
3147 }
3148
3149 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3150 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3151
3152 // with large pages, there are two cases where we need to use Individual Allocation
3153 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3154 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3155 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3156 if (TracePageSizes && Verbose) {
3157 tty->print_cr("Reserving large pages individually.");
3158 }
3159 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3160 if (p_buf == NULL) {
3161 // give an appropriate warning message
3162 if (UseNUMAInterleaving) {
3163 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3164 }
3165 if (UseLargePagesIndividualAllocation) {
3166 warning("Individually allocated large pages failed, "
3167 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3168 }
3169 return NULL;
3170 }
3171
3172 return p_buf;
3173
3174 } else {
3175 if (TracePageSizes && Verbose) {
3176 tty->print_cr("Reserving large pages in a single large chunk.");
3177 }
3178 // normal policy just allocate it all at once
3179 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3180 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3181 if (res != NULL) {
3182 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3183 }
3184
3185 return res;
3186 }
3187 }
3188
3189 bool os::release_memory_special(char* base, size_t bytes) {
3190 assert(base != NULL, "Sanity check");
3191 return release_memory(base, bytes);
3192 }
3193
3194 void os::print_statistics() {
3195 }
3196
3197 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3198 int err = os::get_last_error();
3199 char buf[256];
3200 size_t buf_len = os::lasterror(buf, sizeof(buf));
3201 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3202 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3203 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3204 }
3205
3206 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3207 if (bytes == 0) {
3208 // Don't bother the OS with noops.
3209 return true;
3210 }
3211 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3212 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3213 // Don't attempt to print anything if the OS call fails. We're
3214 // probably low on resources, so the print itself may cause crashes.
3215
3216 // unless we have NUMAInterleaving enabled, the range of a commit
3217 // is always within a reserve covered by a single VirtualAlloc
3218 // in that case we can just do a single commit for the requested size
3219 if (!UseNUMAInterleaving) {
3220 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3221 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3222 return false;
3223 }
3224 if (exec) {
3225 DWORD oldprot;
3226 // Windows doc says to use VirtualProtect to get execute permissions
3227 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3228 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3229 return false;
3230 }
3231 }
3232 return true;
3233 } else {
3234
3235 // when NUMAInterleaving is enabled, the commit might cover a range that
3236 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3237 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3238 // returns represents the number of bytes that can be committed in one step.
3239 size_t bytes_remaining = bytes;
3240 char * next_alloc_addr = addr;
3241 while (bytes_remaining > 0) {
3242 MEMORY_BASIC_INFORMATION alloc_info;
3243 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3244 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3245 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3246 PAGE_READWRITE) == NULL) {
3247 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3248 exec);)
3249 return false;
3250 }
3251 if (exec) {
3252 DWORD oldprot;
3253 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3254 PAGE_EXECUTE_READWRITE, &oldprot)) {
3255 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3256 exec);)
3257 return false;
3258 }
3259 }
3260 bytes_remaining -= bytes_to_rq;
3261 next_alloc_addr += bytes_to_rq;
3262 }
3263 }
3264 // if we made it this far, return true
3265 return true;
3266 }
3267
3268 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3269 bool exec) {
3270 // alignment_hint is ignored on this OS
3271 return pd_commit_memory(addr, size, exec);
3272 }
3273
3274 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3275 const char* mesg) {
3276 assert(mesg != NULL, "mesg must be specified");
3277 if (!pd_commit_memory(addr, size, exec)) {
3278 warn_fail_commit_memory(addr, size, exec);
3279 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3280 }
3281 }
3282
3283 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3284 size_t alignment_hint, bool exec,
3285 const char* mesg) {
3286 // alignment_hint is ignored on this OS
3287 pd_commit_memory_or_exit(addr, size, exec, mesg);
3288 }
3289
3290 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3291 if (bytes == 0) {
3292 // Don't bother the OS with noops.
3293 return true;
3294 }
3295 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3296 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3297 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3298 }
3299
3300 bool os::pd_release_memory(char* addr, size_t bytes) {
3301 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3302 }
3303
3304 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3305 return os::commit_memory(addr, size, !ExecMem);
3306 }
3307
3308 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3309 return os::uncommit_memory(addr, size);
3310 }
3311
3312 // Set protections specified
3313 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3314 bool is_committed) {
3315 unsigned int p = 0;
3316 switch (prot) {
3317 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3318 case MEM_PROT_READ: p = PAGE_READONLY; break;
3319 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3320 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3321 default:
3322 ShouldNotReachHere();
3323 }
3324
3325 DWORD old_status;
3326
3327 // Strange enough, but on Win32 one can change protection only for committed
3328 // memory, not a big deal anyway, as bytes less or equal than 64K
3329 if (!is_committed) {
3330 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3331 "cannot commit protection page");
3332 }
3333 // One cannot use os::guard_memory() here, as on Win32 guard page
3334 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3335 //
3336 // Pages in the region become guard pages. Any attempt to access a guard page
3337 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3338 // the guard page status. Guard pages thus act as a one-time access alarm.
3339 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3340 }
3341
3342 bool os::guard_memory(char* addr, size_t bytes) {
3343 DWORD old_status;
3344 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3345 }
3346
3347 bool os::unguard_memory(char* addr, size_t bytes) {
3348 DWORD old_status;
3349 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3350 }
3351
3352 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3353 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3354 void os::numa_make_global(char *addr, size_t bytes) { }
3355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3356 bool os::numa_topology_changed() { return false; }
3357 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3358 int os::numa_get_group_id() { return 0; }
3359 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3360 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3361 // Provide an answer for UMA systems
3362 ids[0] = 0;
3363 return 1;
3364 } else {
3365 // check for size bigger than actual groups_num
3366 size = MIN2(size, numa_get_groups_num());
3367 for (int i = 0; i < (int)size; i++) {
3368 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3369 }
3370 return size;
3371 }
3372 }
3373
3374 bool os::get_page_info(char *start, page_info* info) {
3375 return false;
3376 }
3377
3378 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3379 page_info* page_found) {
3380 return end;
3381 }
3382
3383 char* os::non_memory_address_word() {
3384 // Must never look like an address returned by reserve_memory,
3385 // even in its subfields (as defined by the CPU immediate fields,
3386 // if the CPU splits constants across multiple instructions).
3387 return (char*)-1;
3388 }
3389
3390 #define MAX_ERROR_COUNT 100
3391 #define SYS_THREAD_ERROR 0xffffffffUL
3392
3393 void os::pd_start_thread(Thread* thread) {
3394 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3395 // Returns previous suspend state:
3396 // 0: Thread was not suspended
3397 // 1: Thread is running now
3398 // >1: Thread is still suspended.
3399 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3400 }
3401
3402 class HighResolutionInterval : public CHeapObj<mtThread> {
3403 // The default timer resolution seems to be 10 milliseconds.
3404 // (Where is this written down?)
3405 // If someone wants to sleep for only a fraction of the default,
3406 // then we set the timer resolution down to 1 millisecond for
3407 // the duration of their interval.
3408 // We carefully set the resolution back, since otherwise we
3409 // seem to incur an overhead (3%?) that we don't need.
3410 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3411 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3412 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3413 // timeBeginPeriod() if the relative error exceeded some threshold.
3414 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3415 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3416 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3417 // resolution timers running.
3418 private:
3419 jlong resolution;
3420 public:
3421 HighResolutionInterval(jlong ms) {
3422 resolution = ms % 10L;
3423 if (resolution != 0) {
3424 MMRESULT result = timeBeginPeriod(1L);
3425 }
3426 }
3427 ~HighResolutionInterval() {
3428 if (resolution != 0) {
3429 MMRESULT result = timeEndPeriod(1L);
3430 }
3431 resolution = 0L;
3432 }
3433 };
3434
3435 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3436 jlong limit = (jlong) MAXDWORD;
3437
3438 while (ms > limit) {
3439 int res;
3440 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3441 return res;
3442 }
3443 ms -= limit;
3444 }
3445
3446 assert(thread == Thread::current(), "thread consistency check");
3447 OSThread* osthread = thread->osthread();
3448 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3449 int result;
3450 if (interruptable) {
3451 assert(thread->is_Java_thread(), "must be java thread");
3452 JavaThread *jt = (JavaThread *) thread;
3453 ThreadBlockInVM tbivm(jt);
3454
3455 jt->set_suspend_equivalent();
3456 // cleared by handle_special_suspend_equivalent_condition() or
3457 // java_suspend_self() via check_and_wait_while_suspended()
3458
3459 HANDLE events[1];
3460 events[0] = osthread->interrupt_event();
3461 HighResolutionInterval *phri=NULL;
3462 if (!ForceTimeHighResolution) {
3463 phri = new HighResolutionInterval(ms);
3464 }
3465 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3466 result = OS_TIMEOUT;
3467 } else {
3468 ResetEvent(osthread->interrupt_event());
3469 osthread->set_interrupted(false);
3470 result = OS_INTRPT;
3471 }
3472 delete phri; //if it is NULL, harmless
3473
3474 // were we externally suspended while we were waiting?
3475 jt->check_and_wait_while_suspended();
3476 } else {
3477 assert(!thread->is_Java_thread(), "must not be java thread");
3478 Sleep((long) ms);
3479 result = OS_TIMEOUT;
3480 }
3481 return result;
3482 }
3483
3484 // Short sleep, direct OS call.
3485 //
3486 // ms = 0, means allow others (if any) to run.
3487 //
3488 void os::naked_short_sleep(jlong ms) {
3489 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3490 Sleep(ms);
3491 }
3492
3493 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3494 void os::infinite_sleep() {
3495 while (true) { // sleep forever ...
3496 Sleep(100000); // ... 100 seconds at a time
3497 }
3498 }
3499
3500 typedef BOOL (WINAPI * STTSignature)(void);
3501
3502 void os::naked_yield() {
3503 // Use either SwitchToThread() or Sleep(0)
3504 // Consider passing back the return value from SwitchToThread().
3505 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3506 SwitchToThread();
3507 } else {
3508 Sleep(0);
3509 }
3510 }
3511
3512 // Win32 only gives you access to seven real priorities at a time,
3513 // so we compress Java's ten down to seven. It would be better
3514 // if we dynamically adjusted relative priorities.
3515
3516 int os::java_to_os_priority[CriticalPriority + 1] = {
3517 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3518 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3519 THREAD_PRIORITY_LOWEST, // 2
3520 THREAD_PRIORITY_BELOW_NORMAL, // 3
3521 THREAD_PRIORITY_BELOW_NORMAL, // 4
3522 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3523 THREAD_PRIORITY_NORMAL, // 6
3524 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3525 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3526 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3527 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3528 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3529 };
3530
3531 int prio_policy1[CriticalPriority + 1] = {
3532 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3533 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3534 THREAD_PRIORITY_LOWEST, // 2
3535 THREAD_PRIORITY_BELOW_NORMAL, // 3
3536 THREAD_PRIORITY_BELOW_NORMAL, // 4
3537 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3540 THREAD_PRIORITY_HIGHEST, // 8
3541 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3542 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3543 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3544 };
3545
3546 static int prio_init() {
3547 // If ThreadPriorityPolicy is 1, switch tables
3548 if (ThreadPriorityPolicy == 1) {
3549 int i;
3550 for (i = 0; i < CriticalPriority + 1; i++) {
3551 os::java_to_os_priority[i] = prio_policy1[i];
3552 }
3553 }
3554 if (UseCriticalJavaThreadPriority) {
3555 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3556 }
3557 return 0;
3558 }
3559
3560 OSReturn os::set_native_priority(Thread* thread, int priority) {
3561 if (!UseThreadPriorities) return OS_OK;
3562 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3563 return ret ? OS_OK : OS_ERR;
3564 }
3565
3566 OSReturn os::get_native_priority(const Thread* const thread,
3567 int* priority_ptr) {
3568 if (!UseThreadPriorities) {
3569 *priority_ptr = java_to_os_priority[NormPriority];
3570 return OS_OK;
3571 }
3572 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3573 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3574 assert(false, "GetThreadPriority failed");
3575 return OS_ERR;
3576 }
3577 *priority_ptr = os_prio;
3578 return OS_OK;
3579 }
3580
3581
3582 // Hint to the underlying OS that a task switch would not be good.
3583 // Void return because it's a hint and can fail.
3584 void os::hint_no_preempt() {}
3585
3586 void os::interrupt(Thread* thread) {
3587 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3588 Threads_lock->owned_by_self(),
3589 "possibility of dangling Thread pointer");
3590
3591 OSThread* osthread = thread->osthread();
3592 osthread->set_interrupted(true);
3593 // More than one thread can get here with the same value of osthread,
3594 // resulting in multiple notifications. We do, however, want the store
3595 // to interrupted() to be visible to other threads before we post
3596 // the interrupt event.
3597 OrderAccess::release();
3598 SetEvent(osthread->interrupt_event());
3599 // For JSR166: unpark after setting status
3600 if (thread->is_Java_thread()) {
3601 ((JavaThread*)thread)->parker()->unpark();
3602 }
3603
3604 ParkEvent * ev = thread->_ParkEvent;
3605 if (ev != NULL) ev->unpark();
3606 }
3607
3608
3609 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3610 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3611 "possibility of dangling Thread pointer");
3612
3613 OSThread* osthread = thread->osthread();
3614 // There is no synchronization between the setting of the interrupt
3615 // and it being cleared here. It is critical - see 6535709 - that
3616 // we only clear the interrupt state, and reset the interrupt event,
3617 // if we are going to report that we were indeed interrupted - else
3618 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3619 // depending on the timing. By checking thread interrupt event to see
3620 // if the thread gets real interrupt thus prevent spurious wakeup.
3621 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3622 if (interrupted && clear_interrupted) {
3623 osthread->set_interrupted(false);
3624 ResetEvent(osthread->interrupt_event());
3625 } // Otherwise leave the interrupted state alone
3626
3627 return interrupted;
3628 }
3629
3630 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3631 ExtendedPC os::get_thread_pc(Thread* thread) {
3632 CONTEXT context;
3633 context.ContextFlags = CONTEXT_CONTROL;
3634 HANDLE handle = thread->osthread()->thread_handle();
3635 #ifdef _M_IA64
3636 assert(0, "Fix get_thread_pc");
3637 return ExtendedPC(NULL);
3638 #else
3639 if (GetThreadContext(handle, &context)) {
3640 #ifdef _M_AMD64
3641 return ExtendedPC((address) context.Rip);
3642 #else
3643 return ExtendedPC((address) context.Eip);
3644 #endif
3645 } else {
3646 return ExtendedPC(NULL);
3647 }
3648 #endif
3649 }
3650
3651 // GetCurrentThreadId() returns DWORD
3652 intx os::current_thread_id() { return GetCurrentThreadId(); }
3653
3654 static int _initial_pid = 0;
3655
3656 int os::current_process_id() {
3657 return (_initial_pid ? _initial_pid : _getpid());
3658 }
3659
3660 int os::win32::_vm_page_size = 0;
3661 int os::win32::_vm_allocation_granularity = 0;
3662 int os::win32::_processor_type = 0;
3663 // Processor level is not available on non-NT systems, use vm_version instead
3664 int os::win32::_processor_level = 0;
3665 julong os::win32::_physical_memory = 0;
3666 size_t os::win32::_default_stack_size = 0;
3667
3668 intx os::win32::_os_thread_limit = 0;
3669 volatile intx os::win32::_os_thread_count = 0;
3670
3671 bool os::win32::_is_nt = false;
3672 bool os::win32::_is_windows_2003 = false;
3673 bool os::win32::_is_windows_server = false;
3674
3675 // 6573254
3676 // Currently, the bug is observed across all the supported Windows releases,
3677 // including the latest one (as of this writing - Windows Server 2012 R2)
3678 bool os::win32::_has_exit_bug = true;
3679 bool os::win32::_has_performance_count = 0;
3680
3681 void os::win32::initialize_system_info() {
3682 SYSTEM_INFO si;
3683 GetSystemInfo(&si);
3684 _vm_page_size = si.dwPageSize;
3685 _vm_allocation_granularity = si.dwAllocationGranularity;
3686 _processor_type = si.dwProcessorType;
3687 _processor_level = si.wProcessorLevel;
3688 set_processor_count(si.dwNumberOfProcessors);
3689
3690 MEMORYSTATUSEX ms;
3691 ms.dwLength = sizeof(ms);
3692
3693 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3694 // dwMemoryLoad (% of memory in use)
3695 GlobalMemoryStatusEx(&ms);
3696 _physical_memory = ms.ullTotalPhys;
3697
3698 OSVERSIONINFOEX oi;
3699 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3700 GetVersionEx((OSVERSIONINFO*)&oi);
3701 switch (oi.dwPlatformId) {
3702 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3703 case VER_PLATFORM_WIN32_NT:
3704 _is_nt = true;
3705 {
3706 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3707 if (os_vers == 5002) {
3708 _is_windows_2003 = true;
3709 }
3710 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3711 oi.wProductType == VER_NT_SERVER) {
3712 _is_windows_server = true;
3713 }
3714 }
3715 break;
3716 default: fatal("Unknown platform");
3717 }
3718
3719 _default_stack_size = os::current_stack_size();
3720 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3721 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3722 "stack size not a multiple of page size");
3723
3724 initialize_performance_counter();
3725
3726 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3727 // known to deadlock the system, if the VM issues to thread operations with
3728 // a too high frequency, e.g., such as changing the priorities.
3729 // The 6000 seems to work well - no deadlocks has been notices on the test
3730 // programs that we have seen experience this problem.
3731 if (!os::win32::is_nt()) {
3732 StarvationMonitorInterval = 6000;
3733 }
3734 }
3735
3736
3737 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3738 int ebuflen) {
3739 char path[MAX_PATH];
3740 DWORD size;
3741 DWORD pathLen = (DWORD)sizeof(path);
3742 HINSTANCE result = NULL;
3743
3744 // only allow library name without path component
3745 assert(strchr(name, '\\') == NULL, "path not allowed");
3746 assert(strchr(name, ':') == NULL, "path not allowed");
3747 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3748 jio_snprintf(ebuf, ebuflen,
3749 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3750 return NULL;
3751 }
3752
3753 // search system directory
3754 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3755 if (size >= pathLen) {
3756 return NULL; // truncated
3757 }
3758 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3759 return NULL; // truncated
3760 }
3761 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3762 return result;
3763 }
3764 }
3765
3766 // try Windows directory
3767 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3768 if (size >= pathLen) {
3769 return NULL; // truncated
3770 }
3771 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3772 return NULL; // truncated
3773 }
3774 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3775 return result;
3776 }
3777 }
3778
3779 jio_snprintf(ebuf, ebuflen,
3780 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3781 return NULL;
3782 }
3783
3784 #define MAX_EXIT_HANDLES 16
3785 #define EXIT_TIMEOUT 1000 /* 1 sec */
3786
3787 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3788 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3789 return TRUE;
3790 }
3791
3792 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3793 // Basic approach:
3794 // - Each exiting thread registers its intent to exit and then does so.
3795 // - A thread trying to terminate the process must wait for all
3796 // threads currently exiting to complete their exit.
3797
3798 if (os::win32::has_exit_bug()) {
3799 // The array holds handles of the threads that have started exiting by calling
3800 // _endthreadex().
3801 // Should be large enough to avoid blocking the exiting thread due to lack of
3802 // a free slot.
3803 static HANDLE handles[MAX_EXIT_HANDLES];
3804 static int handle_count = 0;
3805
3806 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3807 static CRITICAL_SECTION crit_sect;
3808 int i, j;
3809 DWORD res;
3810 HANDLE hproc, hthr;
3811
3812 // The first thread that reached this point, initializes the critical section.
3813 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3814 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3815 } else {
3816 EnterCriticalSection(&crit_sect);
3817
3818 if (what == EPT_THREAD) {
3819 // Remove from the array those handles of the threads that have completed exiting.
3820 for (i = 0, j = 0; i < handle_count; ++i) {
3821 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3822 if (res == WAIT_TIMEOUT) {
3823 handles[j++] = handles[i];
3824 } else {
3825 if (res != WAIT_OBJECT_0) {
3826 warning("WaitForSingleObject failed in %s: %d\n", __FILE__, __LINE__);
3827 // Don't keep the handle, if we failed waiting for it.
3828 }
3829 CloseHandle(handles[i]);
3830 }
3831 }
3832
3833 // If there's no free slot in the array of the kept handles, we'll have to
3834 // wait until at least one thread completes exiting.
3835 if ((handle_count = j) == MAX_EXIT_HANDLES) {
3836 res = WaitForMultipleObjects(MAX_EXIT_HANDLES, handles, FALSE, EXIT_TIMEOUT);
3837 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAX_EXIT_HANDLES)) {
3838 i = (res - WAIT_OBJECT_0);
3839 handle_count = MAX_EXIT_HANDLES - 1;
3840 for (; i < handle_count; ++i) {
3841 handles[i] = handles[i + 1];
3842 }
3843 } else {
3844 warning("WaitForMultipleObjects failed in %s: %d\n", __FILE__, __LINE__);
3845 // Don't keep handles, if we failed waiting for them.
3846 for (i = 0; i < MAX_EXIT_HANDLES; ++i) {
3847 CloseHandle(handles[i]);
3848 }
3849 handle_count = 0;
3850 }
3851 }
3852
3853 // Store a duplicate of the current thread handle in the array of handles.
3854 hproc = GetCurrentProcess();
3855 hthr = GetCurrentThread();
3856 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3857 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3858 warning("DuplicateHandle failed in %s: %d\n", __FILE__, __LINE__);
3859 } else {
3860 ++handle_count;
3861 }
3862
3863 // The current exiting thread has stored its handle in the array, and now
3864 // should leave the critical section before calling _endthreadex().
3865
3866 } else { // what != EPT_THREAD
3867 if (handle_count > 0) {
3868 // Before ending the process, make sure all the threads that had called
3869 // _endthreadex() completed.
3870 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3871 if (res == WAIT_FAILED) {
3872 warning("WaitForMultipleObjects failed in %s: %d\n", __FILE__, __LINE__);
3873 }
3874 for (i = 0; i < handle_count; ++i) {
3875 CloseHandle(handles[i]);
3876 }
3877 handle_count = 0;
3878 }
3879
3880 // End the process, not leaving critical section.
3881 // This makes sure no other thread executes exit-related code at the same
3882 // time, thus a race is avoided.
3883 if (what == EPT_PROCESS) {
3884 ::exit(exit_code);
3885 } else {
3886 _exit(exit_code);
3887 }
3888 }
3889
3890 LeaveCriticalSection(&crit_sect);
3891 }
3892 }
3893
3894 // We are here if either
3895 // - there's no 'race at exit' bug on this OS release;
3896 // - initialization of the critical section failed (unlikely);
3897 // - the current thread has stored its handle and left the critical section.
3898 if (what == EPT_THREAD) {
3899 _endthreadex((unsigned)exit_code);
3900 } else if (what == EPT_PROCESS) {
3901 ::exit(exit_code);
3902 } else {
3903 _exit(exit_code);
3904 }
3905
3906 // Should not reach here
3907 return exit_code;
3908 }
3909
3910 #undef MAX_EXIT_HANDLES
3911 #undef EXIT_TIMEOUT
3912
3913 void os::win32::setmode_streams() {
3914 _setmode(_fileno(stdin), _O_BINARY);
3915 _setmode(_fileno(stdout), _O_BINARY);
3916 _setmode(_fileno(stderr), _O_BINARY);
3917 }
3918
3919
3920 bool os::is_debugger_attached() {
3921 return IsDebuggerPresent() ? true : false;
3922 }
3923
3924
3925 void os::wait_for_keypress_at_exit(void) {
3926 if (PauseAtExit) {
3927 fprintf(stderr, "Press any key to continue...\n");
3928 fgetc(stdin);
3929 }
3930 }
3931
3932
3933 int os::message_box(const char* title, const char* message) {
3934 int result = MessageBox(NULL, message, title,
3935 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3936 return result == IDYES;
3937 }
3938
3939 int os::allocate_thread_local_storage() {
3940 return TlsAlloc();
3941 }
3942
3943
3944 void os::free_thread_local_storage(int index) {
3945 TlsFree(index);
3946 }
3947
3948
3949 void os::thread_local_storage_at_put(int index, void* value) {
3950 TlsSetValue(index, value);
3951 assert(thread_local_storage_at(index) == value, "Just checking");
3952 }
3953
3954
3955 void* os::thread_local_storage_at(int index) {
3956 return TlsGetValue(index);
3957 }
3958
3959
3960 #ifndef PRODUCT
3961 #ifndef _WIN64
3962 // Helpers to check whether NX protection is enabled
3963 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3964 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3965 pex->ExceptionRecord->NumberParameters > 0 &&
3966 pex->ExceptionRecord->ExceptionInformation[0] ==
3967 EXCEPTION_INFO_EXEC_VIOLATION) {
3968 return EXCEPTION_EXECUTE_HANDLER;
3969 }
3970 return EXCEPTION_CONTINUE_SEARCH;
3971 }
3972
3973 void nx_check_protection() {
3974 // If NX is enabled we'll get an exception calling into code on the stack
3975 char code[] = { (char)0xC3 }; // ret
3976 void *code_ptr = (void *)code;
3977 __try {
3978 __asm call code_ptr
3979 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3980 tty->print_raw_cr("NX protection detected.");
3981 }
3982 }
3983 #endif // _WIN64
3984 #endif // PRODUCT
3985
3986 // this is called _before_ the global arguments have been parsed
3987 void os::init(void) {
3988 _initial_pid = _getpid();
3989
3990 init_random(1234567);
3991
3992 win32::initialize_system_info();
3993 win32::setmode_streams();
3994 init_page_sizes((size_t) win32::vm_page_size());
3995
3996 // This may be overridden later when argument processing is done.
3997 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3998 os::win32::is_windows_2003());
3999
4000 // Initialize main_process and main_thread
4001 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4002 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4003 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4004 fatal("DuplicateHandle failed\n");
4005 }
4006 main_thread_id = (int) GetCurrentThreadId();
4007 }
4008
4009 // To install functions for atexit processing
4010 extern "C" {
4011 static void perfMemory_exit_helper() {
4012 perfMemory_exit();
4013 }
4014 }
4015
4016 static jint initSock();
4017
4018 // this is called _after_ the global arguments have been parsed
4019 jint os::init_2(void) {
4020 // Allocate a single page and mark it as readable for safepoint polling
4021 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4022 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4023
4024 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4025 guarantee(return_page != NULL, "Commit Failed for polling page");
4026
4027 os::set_polling_page(polling_page);
4028
4029 #ifndef PRODUCT
4030 if (Verbose && PrintMiscellaneous) {
4031 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4032 (intptr_t)polling_page);
4033 }
4034 #endif
4035
4036 if (!UseMembar) {
4037 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4038 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4039
4040 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4041 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4042
4043 os::set_memory_serialize_page(mem_serialize_page);
4044
4045 #ifndef PRODUCT
4046 if (Verbose && PrintMiscellaneous) {
4047 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4048 (intptr_t)mem_serialize_page);
4049 }
4050 #endif
4051 }
4052
4053 // Setup Windows Exceptions
4054
4055 // for debugging float code generation bugs
4056 if (ForceFloatExceptions) {
4057 #ifndef _WIN64
4058 static long fp_control_word = 0;
4059 __asm { fstcw fp_control_word }
4060 // see Intel PPro Manual, Vol. 2, p 7-16
4061 const long precision = 0x20;
4062 const long underflow = 0x10;
4063 const long overflow = 0x08;
4064 const long zero_div = 0x04;
4065 const long denorm = 0x02;
4066 const long invalid = 0x01;
4067 fp_control_word |= invalid;
4068 __asm { fldcw fp_control_word }
4069 #endif
4070 }
4071
4072 // If stack_commit_size is 0, windows will reserve the default size,
4073 // but only commit a small portion of it.
4074 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4075 size_t default_reserve_size = os::win32::default_stack_size();
4076 size_t actual_reserve_size = stack_commit_size;
4077 if (stack_commit_size < default_reserve_size) {
4078 // If stack_commit_size == 0, we want this too
4079 actual_reserve_size = default_reserve_size;
4080 }
4081
4082 // Check minimum allowable stack size for thread creation and to initialize
4083 // the java system classes, including StackOverflowError - depends on page
4084 // size. Add a page for compiler2 recursion in main thread.
4085 // Add in 2*BytesPerWord times page size to account for VM stack during
4086 // class initialization depending on 32 or 64 bit VM.
4087 size_t min_stack_allowed =
4088 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4089 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4090 if (actual_reserve_size < min_stack_allowed) {
4091 tty->print_cr("\nThe stack size specified is too small, "
4092 "Specify at least %dk",
4093 min_stack_allowed / K);
4094 return JNI_ERR;
4095 }
4096
4097 JavaThread::set_stack_size_at_create(stack_commit_size);
4098
4099 // Calculate theoretical max. size of Threads to guard gainst artifical
4100 // out-of-memory situations, where all available address-space has been
4101 // reserved by thread stacks.
4102 assert(actual_reserve_size != 0, "Must have a stack");
4103
4104 // Calculate the thread limit when we should start doing Virtual Memory
4105 // banging. Currently when the threads will have used all but 200Mb of space.
4106 //
4107 // TODO: consider performing a similar calculation for commit size instead
4108 // as reserve size, since on a 64-bit platform we'll run into that more
4109 // often than running out of virtual memory space. We can use the
4110 // lower value of the two calculations as the os_thread_limit.
4111 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4112 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4113
4114 // at exit methods are called in the reverse order of their registration.
4115 // there is no limit to the number of functions registered. atexit does
4116 // not set errno.
4117
4118 if (PerfAllowAtExitRegistration) {
4119 // only register atexit functions if PerfAllowAtExitRegistration is set.
4120 // atexit functions can be delayed until process exit time, which
4121 // can be problematic for embedded VM situations. Embedded VMs should
4122 // call DestroyJavaVM() to assure that VM resources are released.
4123
4124 // note: perfMemory_exit_helper atexit function may be removed in
4125 // the future if the appropriate cleanup code can be added to the
4126 // VM_Exit VMOperation's doit method.
4127 if (atexit(perfMemory_exit_helper) != 0) {
4128 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4129 }
4130 }
4131
4132 #ifndef _WIN64
4133 // Print something if NX is enabled (win32 on AMD64)
4134 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4135 #endif
4136
4137 // initialize thread priority policy
4138 prio_init();
4139
4140 if (UseNUMA && !ForceNUMA) {
4141 UseNUMA = false; // We don't fully support this yet
4142 }
4143
4144 if (UseNUMAInterleaving) {
4145 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4146 bool success = numa_interleaving_init();
4147 if (!success) UseNUMAInterleaving = false;
4148 }
4149
4150 if (initSock() != JNI_OK) {
4151 return JNI_ERR;
4152 }
4153
4154 return JNI_OK;
4155 }
4156
4157 // Mark the polling page as unreadable
4158 void os::make_polling_page_unreadable(void) {
4159 DWORD old_status;
4160 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4161 PAGE_NOACCESS, &old_status)) {
4162 fatal("Could not disable polling page");
4163 }
4164 }
4165
4166 // Mark the polling page as readable
4167 void os::make_polling_page_readable(void) {
4168 DWORD old_status;
4169 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4170 PAGE_READONLY, &old_status)) {
4171 fatal("Could not enable polling page");
4172 }
4173 }
4174
4175
4176 int os::stat(const char *path, struct stat *sbuf) {
4177 char pathbuf[MAX_PATH];
4178 if (strlen(path) > MAX_PATH - 1) {
4179 errno = ENAMETOOLONG;
4180 return -1;
4181 }
4182 os::native_path(strcpy(pathbuf, path));
4183 int ret = ::stat(pathbuf, sbuf);
4184 if (sbuf != NULL && UseUTCFileTimestamp) {
4185 // Fix for 6539723. st_mtime returned from stat() is dependent on
4186 // the system timezone and so can return different values for the
4187 // same file if/when daylight savings time changes. This adjustment
4188 // makes sure the same timestamp is returned regardless of the TZ.
4189 //
4190 // See:
4191 // http://msdn.microsoft.com/library/
4192 // default.asp?url=/library/en-us/sysinfo/base/
4193 // time_zone_information_str.asp
4194 // and
4195 // http://msdn.microsoft.com/library/default.asp?url=
4196 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4197 //
4198 // NOTE: there is a insidious bug here: If the timezone is changed
4199 // after the call to stat() but before 'GetTimeZoneInformation()', then
4200 // the adjustment we do here will be wrong and we'll return the wrong
4201 // value (which will likely end up creating an invalid class data
4202 // archive). Absent a better API for this, or some time zone locking
4203 // mechanism, we'll have to live with this risk.
4204 TIME_ZONE_INFORMATION tz;
4205 DWORD tzid = GetTimeZoneInformation(&tz);
4206 int daylightBias =
4207 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4208 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4209 }
4210 return ret;
4211 }
4212
4213
4214 #define FT2INT64(ft) \
4215 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4216
4217
4218 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4219 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4220 // of a thread.
4221 //
4222 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4223 // the fast estimate available on the platform.
4224
4225 // current_thread_cpu_time() is not optimized for Windows yet
4226 jlong os::current_thread_cpu_time() {
4227 // return user + sys since the cost is the same
4228 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4229 }
4230
4231 jlong os::thread_cpu_time(Thread* thread) {
4232 // consistent with what current_thread_cpu_time() returns.
4233 return os::thread_cpu_time(thread, true /* user+sys */);
4234 }
4235
4236 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4237 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4238 }
4239
4240 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4241 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4242 // If this function changes, os::is_thread_cpu_time_supported() should too
4243 if (os::win32::is_nt()) {
4244 FILETIME CreationTime;
4245 FILETIME ExitTime;
4246 FILETIME KernelTime;
4247 FILETIME UserTime;
4248
4249 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4250 &ExitTime, &KernelTime, &UserTime) == 0) {
4251 return -1;
4252 } else if (user_sys_cpu_time) {
4253 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4254 } else {
4255 return FT2INT64(UserTime) * 100;
4256 }
4257 } else {
4258 return (jlong) timeGetTime() * 1000000;
4259 }
4260 }
4261
4262 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4263 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4264 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4265 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4266 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4267 }
4268
4269 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4270 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4271 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4272 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4273 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4274 }
4275
4276 bool os::is_thread_cpu_time_supported() {
4277 // see os::thread_cpu_time
4278 if (os::win32::is_nt()) {
4279 FILETIME CreationTime;
4280 FILETIME ExitTime;
4281 FILETIME KernelTime;
4282 FILETIME UserTime;
4283
4284 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4285 &KernelTime, &UserTime) == 0) {
4286 return false;
4287 } else {
4288 return true;
4289 }
4290 } else {
4291 return false;
4292 }
4293 }
4294
4295 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4296 // It does have primitives (PDH API) to get CPU usage and run queue length.
4297 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4298 // If we wanted to implement loadavg on Windows, we have a few options:
4299 //
4300 // a) Query CPU usage and run queue length and "fake" an answer by
4301 // returning the CPU usage if it's under 100%, and the run queue
4302 // length otherwise. It turns out that querying is pretty slow
4303 // on Windows, on the order of 200 microseconds on a fast machine.
4304 // Note that on the Windows the CPU usage value is the % usage
4305 // since the last time the API was called (and the first call
4306 // returns 100%), so we'd have to deal with that as well.
4307 //
4308 // b) Sample the "fake" answer using a sampling thread and store
4309 // the answer in a global variable. The call to loadavg would
4310 // just return the value of the global, avoiding the slow query.
4311 //
4312 // c) Sample a better answer using exponential decay to smooth the
4313 // value. This is basically the algorithm used by UNIX kernels.
4314 //
4315 // Note that sampling thread starvation could affect both (b) and (c).
4316 int os::loadavg(double loadavg[], int nelem) {
4317 return -1;
4318 }
4319
4320
4321 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4322 bool os::dont_yield() {
4323 return DontYieldALot;
4324 }
4325
4326 // This method is a slightly reworked copy of JDK's sysOpen
4327 // from src/windows/hpi/src/sys_api_md.c
4328
4329 int os::open(const char *path, int oflag, int mode) {
4330 char pathbuf[MAX_PATH];
4331
4332 if (strlen(path) > MAX_PATH - 1) {
4333 errno = ENAMETOOLONG;
4334 return -1;
4335 }
4336 os::native_path(strcpy(pathbuf, path));
4337 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4338 }
4339
4340 FILE* os::open(int fd, const char* mode) {
4341 return ::_fdopen(fd, mode);
4342 }
4343
4344 // Is a (classpath) directory empty?
4345 bool os::dir_is_empty(const char* path) {
4346 WIN32_FIND_DATA fd;
4347 HANDLE f = FindFirstFile(path, &fd);
4348 if (f == INVALID_HANDLE_VALUE) {
4349 return true;
4350 }
4351 FindClose(f);
4352 return false;
4353 }
4354
4355 // create binary file, rewriting existing file if required
4356 int os::create_binary_file(const char* path, bool rewrite_existing) {
4357 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4358 if (!rewrite_existing) {
4359 oflags |= _O_EXCL;
4360 }
4361 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4362 }
4363
4364 // return current position of file pointer
4365 jlong os::current_file_offset(int fd) {
4366 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4367 }
4368
4369 // move file pointer to the specified offset
4370 jlong os::seek_to_file_offset(int fd, jlong offset) {
4371 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4372 }
4373
4374
4375 jlong os::lseek(int fd, jlong offset, int whence) {
4376 return (jlong) ::_lseeki64(fd, offset, whence);
4377 }
4378
4379 // This method is a slightly reworked copy of JDK's sysNativePath
4380 // from src/windows/hpi/src/path_md.c
4381
4382 // Convert a pathname to native format. On win32, this involves forcing all
4383 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4384 // sometimes rejects '/') and removing redundant separators. The input path is
4385 // assumed to have been converted into the character encoding used by the local
4386 // system. Because this might be a double-byte encoding, care is taken to
4387 // treat double-byte lead characters correctly.
4388 //
4389 // This procedure modifies the given path in place, as the result is never
4390 // longer than the original. There is no error return; this operation always
4391 // succeeds.
4392 char * os::native_path(char *path) {
4393 char *src = path, *dst = path, *end = path;
4394 char *colon = NULL; // If a drive specifier is found, this will
4395 // point to the colon following the drive letter
4396
4397 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4398 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4399 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4400
4401 // Check for leading separators
4402 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4403 while (isfilesep(*src)) {
4404 src++;
4405 }
4406
4407 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4408 // Remove leading separators if followed by drive specifier. This
4409 // hack is necessary to support file URLs containing drive
4410 // specifiers (e.g., "file://c:/path"). As a side effect,
4411 // "/c:/path" can be used as an alternative to "c:/path".
4412 *dst++ = *src++;
4413 colon = dst;
4414 *dst++ = ':';
4415 src++;
4416 } else {
4417 src = path;
4418 if (isfilesep(src[0]) && isfilesep(src[1])) {
4419 // UNC pathname: Retain first separator; leave src pointed at
4420 // second separator so that further separators will be collapsed
4421 // into the second separator. The result will be a pathname
4422 // beginning with "\\\\" followed (most likely) by a host name.
4423 src = dst = path + 1;
4424 path[0] = '\\'; // Force first separator to '\\'
4425 }
4426 }
4427
4428 end = dst;
4429
4430 // Remove redundant separators from remainder of path, forcing all
4431 // separators to be '\\' rather than '/'. Also, single byte space
4432 // characters are removed from the end of the path because those
4433 // are not legal ending characters on this operating system.
4434 //
4435 while (*src != '\0') {
4436 if (isfilesep(*src)) {
4437 *dst++ = '\\'; src++;
4438 while (isfilesep(*src)) src++;
4439 if (*src == '\0') {
4440 // Check for trailing separator
4441 end = dst;
4442 if (colon == dst - 2) break; // "z:\\"
4443 if (dst == path + 1) break; // "\\"
4444 if (dst == path + 2 && isfilesep(path[0])) {
4445 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4446 // beginning of a UNC pathname. Even though it is not, by
4447 // itself, a valid UNC pathname, we leave it as is in order
4448 // to be consistent with the path canonicalizer as well
4449 // as the win32 APIs, which treat this case as an invalid
4450 // UNC pathname rather than as an alias for the root
4451 // directory of the current drive.
4452 break;
4453 }
4454 end = --dst; // Path does not denote a root directory, so
4455 // remove trailing separator
4456 break;
4457 }
4458 end = dst;
4459 } else {
4460 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4461 *dst++ = *src++;
4462 if (*src) *dst++ = *src++;
4463 end = dst;
4464 } else { // Copy a single-byte character
4465 char c = *src++;
4466 *dst++ = c;
4467 // Space is not a legal ending character
4468 if (c != ' ') end = dst;
4469 }
4470 }
4471 }
4472
4473 *end = '\0';
4474
4475 // For "z:", add "." to work around a bug in the C runtime library
4476 if (colon == dst - 1) {
4477 path[2] = '.';
4478 path[3] = '\0';
4479 }
4480
4481 return path;
4482 }
4483
4484 // This code is a copy of JDK's sysSetLength
4485 // from src/windows/hpi/src/sys_api_md.c
4486
4487 int os::ftruncate(int fd, jlong length) {
4488 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4489 long high = (long)(length >> 32);
4490 DWORD ret;
4491
4492 if (h == (HANDLE)(-1)) {
4493 return -1;
4494 }
4495
4496 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4497 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4498 return -1;
4499 }
4500
4501 if (::SetEndOfFile(h) == FALSE) {
4502 return -1;
4503 }
4504
4505 return 0;
4506 }
4507
4508
4509 // This code is a copy of JDK's sysSync
4510 // from src/windows/hpi/src/sys_api_md.c
4511 // except for the legacy workaround for a bug in Win 98
4512
4513 int os::fsync(int fd) {
4514 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4515
4516 if ((!::FlushFileBuffers(handle)) &&
4517 (GetLastError() != ERROR_ACCESS_DENIED)) {
4518 // from winerror.h
4519 return -1;
4520 }
4521 return 0;
4522 }
4523
4524 static int nonSeekAvailable(int, long *);
4525 static int stdinAvailable(int, long *);
4526
4527 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4528 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4529
4530 // This code is a copy of JDK's sysAvailable
4531 // from src/windows/hpi/src/sys_api_md.c
4532
4533 int os::available(int fd, jlong *bytes) {
4534 jlong cur, end;
4535 struct _stati64 stbuf64;
4536
4537 if (::_fstati64(fd, &stbuf64) >= 0) {
4538 int mode = stbuf64.st_mode;
4539 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4540 int ret;
4541 long lpbytes;
4542 if (fd == 0) {
4543 ret = stdinAvailable(fd, &lpbytes);
4544 } else {
4545 ret = nonSeekAvailable(fd, &lpbytes);
4546 }
4547 (*bytes) = (jlong)(lpbytes);
4548 return ret;
4549 }
4550 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4551 return FALSE;
4552 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4553 return FALSE;
4554 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4555 return FALSE;
4556 }
4557 *bytes = end - cur;
4558 return TRUE;
4559 } else {
4560 return FALSE;
4561 }
4562 }
4563
4564 // This code is a copy of JDK's nonSeekAvailable
4565 // from src/windows/hpi/src/sys_api_md.c
4566
4567 static int nonSeekAvailable(int fd, long *pbytes) {
4568 // This is used for available on non-seekable devices
4569 // (like both named and anonymous pipes, such as pipes
4570 // connected to an exec'd process).
4571 // Standard Input is a special case.
4572 HANDLE han;
4573
4574 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4575 return FALSE;
4576 }
4577
4578 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4579 // PeekNamedPipe fails when at EOF. In that case we
4580 // simply make *pbytes = 0 which is consistent with the
4581 // behavior we get on Solaris when an fd is at EOF.
4582 // The only alternative is to raise an Exception,
4583 // which isn't really warranted.
4584 //
4585 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4586 return FALSE;
4587 }
4588 *pbytes = 0;
4589 }
4590 return TRUE;
4591 }
4592
4593 #define MAX_INPUT_EVENTS 2000
4594
4595 // This code is a copy of JDK's stdinAvailable
4596 // from src/windows/hpi/src/sys_api_md.c
4597
4598 static int stdinAvailable(int fd, long *pbytes) {
4599 HANDLE han;
4600 DWORD numEventsRead = 0; // Number of events read from buffer
4601 DWORD numEvents = 0; // Number of events in buffer
4602 DWORD i = 0; // Loop index
4603 DWORD curLength = 0; // Position marker
4604 DWORD actualLength = 0; // Number of bytes readable
4605 BOOL error = FALSE; // Error holder
4606 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4607
4608 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4609 return FALSE;
4610 }
4611
4612 // Construct an array of input records in the console buffer
4613 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4614 if (error == 0) {
4615 return nonSeekAvailable(fd, pbytes);
4616 }
4617
4618 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4619 if (numEvents > MAX_INPUT_EVENTS) {
4620 numEvents = MAX_INPUT_EVENTS;
4621 }
4622
4623 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4624 if (lpBuffer == NULL) {
4625 return FALSE;
4626 }
4627
4628 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4629 if (error == 0) {
4630 os::free(lpBuffer);
4631 return FALSE;
4632 }
4633
4634 // Examine input records for the number of bytes available
4635 for (i=0; i<numEvents; i++) {
4636 if (lpBuffer[i].EventType == KEY_EVENT) {
4637
4638 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4639 &(lpBuffer[i].Event);
4640 if (keyRecord->bKeyDown == TRUE) {
4641 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4642 curLength++;
4643 if (*keyPressed == '\r') {
4644 actualLength = curLength;
4645 }
4646 }
4647 }
4648 }
4649
4650 if (lpBuffer != NULL) {
4651 os::free(lpBuffer);
4652 }
4653
4654 *pbytes = (long) actualLength;
4655 return TRUE;
4656 }
4657
4658 // Map a block of memory.
4659 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4660 char *addr, size_t bytes, bool read_only,
4661 bool allow_exec) {
4662 HANDLE hFile;
4663 char* base;
4664
4665 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4666 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4667 if (hFile == NULL) {
4668 if (PrintMiscellaneous && Verbose) {
4669 DWORD err = GetLastError();
4670 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4671 }
4672 return NULL;
4673 }
4674
4675 if (allow_exec) {
4676 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4677 // unless it comes from a PE image (which the shared archive is not.)
4678 // Even VirtualProtect refuses to give execute access to mapped memory
4679 // that was not previously executable.
4680 //
4681 // Instead, stick the executable region in anonymous memory. Yuck.
4682 // Penalty is that ~4 pages will not be shareable - in the future
4683 // we might consider DLLizing the shared archive with a proper PE
4684 // header so that mapping executable + sharing is possible.
4685
4686 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4687 PAGE_READWRITE);
4688 if (base == NULL) {
4689 if (PrintMiscellaneous && Verbose) {
4690 DWORD err = GetLastError();
4691 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4692 }
4693 CloseHandle(hFile);
4694 return NULL;
4695 }
4696
4697 DWORD bytes_read;
4698 OVERLAPPED overlapped;
4699 overlapped.Offset = (DWORD)file_offset;
4700 overlapped.OffsetHigh = 0;
4701 overlapped.hEvent = NULL;
4702 // ReadFile guarantees that if the return value is true, the requested
4703 // number of bytes were read before returning.
4704 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4705 if (!res) {
4706 if (PrintMiscellaneous && Verbose) {
4707 DWORD err = GetLastError();
4708 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4709 }
4710 release_memory(base, bytes);
4711 CloseHandle(hFile);
4712 return NULL;
4713 }
4714 } else {
4715 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4716 NULL /* file_name */);
4717 if (hMap == NULL) {
4718 if (PrintMiscellaneous && Verbose) {
4719 DWORD err = GetLastError();
4720 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4721 }
4722 CloseHandle(hFile);
4723 return NULL;
4724 }
4725
4726 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4727 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4728 (DWORD)bytes, addr);
4729 if (base == NULL) {
4730 if (PrintMiscellaneous && Verbose) {
4731 DWORD err = GetLastError();
4732 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4733 }
4734 CloseHandle(hMap);
4735 CloseHandle(hFile);
4736 return NULL;
4737 }
4738
4739 if (CloseHandle(hMap) == 0) {
4740 if (PrintMiscellaneous && Verbose) {
4741 DWORD err = GetLastError();
4742 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4743 }
4744 CloseHandle(hFile);
4745 return base;
4746 }
4747 }
4748
4749 if (allow_exec) {
4750 DWORD old_protect;
4751 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4752 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4753
4754 if (!res) {
4755 if (PrintMiscellaneous && Verbose) {
4756 DWORD err = GetLastError();
4757 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4758 }
4759 // Don't consider this a hard error, on IA32 even if the
4760 // VirtualProtect fails, we should still be able to execute
4761 CloseHandle(hFile);
4762 return base;
4763 }
4764 }
4765
4766 if (CloseHandle(hFile) == 0) {
4767 if (PrintMiscellaneous && Verbose) {
4768 DWORD err = GetLastError();
4769 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4770 }
4771 return base;
4772 }
4773
4774 return base;
4775 }
4776
4777
4778 // Remap a block of memory.
4779 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4780 char *addr, size_t bytes, bool read_only,
4781 bool allow_exec) {
4782 // This OS does not allow existing memory maps to be remapped so we
4783 // have to unmap the memory before we remap it.
4784 if (!os::unmap_memory(addr, bytes)) {
4785 return NULL;
4786 }
4787
4788 // There is a very small theoretical window between the unmap_memory()
4789 // call above and the map_memory() call below where a thread in native
4790 // code may be able to access an address that is no longer mapped.
4791
4792 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4793 read_only, allow_exec);
4794 }
4795
4796
4797 // Unmap a block of memory.
4798 // Returns true=success, otherwise false.
4799
4800 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4801 BOOL result = UnmapViewOfFile(addr);
4802 if (result == 0) {
4803 if (PrintMiscellaneous && Verbose) {
4804 DWORD err = GetLastError();
4805 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4806 }
4807 return false;
4808 }
4809 return true;
4810 }
4811
4812 void os::pause() {
4813 char filename[MAX_PATH];
4814 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4815 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4816 } else {
4817 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4818 }
4819
4820 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4821 if (fd != -1) {
4822 struct stat buf;
4823 ::close(fd);
4824 while (::stat(filename, &buf) == 0) {
4825 Sleep(100);
4826 }
4827 } else {
4828 jio_fprintf(stderr,
4829 "Could not open pause file '%s', continuing immediately.\n", filename);
4830 }
4831 }
4832
4833 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4834 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4835 }
4836
4837 // See the caveats for this class in os_windows.hpp
4838 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4839 // into this method and returns false. If no OS EXCEPTION was raised, returns
4840 // true.
4841 // The callback is supposed to provide the method that should be protected.
4842 //
4843 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4844 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4845 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4846 "crash_protection already set?");
4847
4848 bool success = true;
4849 __try {
4850 WatcherThread::watcher_thread()->set_crash_protection(this);
4851 cb.call();
4852 } __except(EXCEPTION_EXECUTE_HANDLER) {
4853 // only for protection, nothing to do
4854 success = false;
4855 }
4856 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4857 return success;
4858 }
4859
4860 // An Event wraps a win32 "CreateEvent" kernel handle.
4861 //
4862 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4863 //
4864 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4865 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4866 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4867 // In addition, an unpark() operation might fetch the handle field, but the
4868 // event could recycle between the fetch and the SetEvent() operation.
4869 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4870 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4871 // on an stale but recycled handle would be harmless, but in practice this might
4872 // confuse other non-Sun code, so it's not a viable approach.
4873 //
4874 // 2: Once a win32 event handle is associated with an Event, it remains associated
4875 // with the Event. The event handle is never closed. This could be construed
4876 // as handle leakage, but only up to the maximum # of threads that have been extant
4877 // at any one time. This shouldn't be an issue, as windows platforms typically
4878 // permit a process to have hundreds of thousands of open handles.
4879 //
4880 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4881 // and release unused handles.
4882 //
4883 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4884 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4885 //
4886 // 5. Use an RCU-like mechanism (Read-Copy Update).
4887 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4888 //
4889 // We use (2).
4890 //
4891 // TODO-FIXME:
4892 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4893 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4894 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4895 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4896 // into a single win32 CreateEvent() handle.
4897 //
4898 // Assumption:
4899 // Only one parker can exist on an event, which is why we allocate
4900 // them per-thread. Multiple unparkers can coexist.
4901 //
4902 // _Event transitions in park()
4903 // -1 => -1 : illegal
4904 // 1 => 0 : pass - return immediately
4905 // 0 => -1 : block; then set _Event to 0 before returning
4906 //
4907 // _Event transitions in unpark()
4908 // 0 => 1 : just return
4909 // 1 => 1 : just return
4910 // -1 => either 0 or 1; must signal target thread
4911 // That is, we can safely transition _Event from -1 to either
4912 // 0 or 1.
4913 //
4914 // _Event serves as a restricted-range semaphore.
4915 // -1 : thread is blocked, i.e. there is a waiter
4916 // 0 : neutral: thread is running or ready,
4917 // could have been signaled after a wait started
4918 // 1 : signaled - thread is running or ready
4919 //
4920 // Another possible encoding of _Event would be with
4921 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4922 //
4923
4924 int os::PlatformEvent::park(jlong Millis) {
4925 // Transitions for _Event:
4926 // -1 => -1 : illegal
4927 // 1 => 0 : pass - return immediately
4928 // 0 => -1 : block; then set _Event to 0 before returning
4929
4930 guarantee(_ParkHandle != NULL , "Invariant");
4931 guarantee(Millis > 0 , "Invariant");
4932
4933 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4934 // the initial park() operation.
4935 // Consider: use atomic decrement instead of CAS-loop
4936
4937 int v;
4938 for (;;) {
4939 v = _Event;
4940 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4941 }
4942 guarantee((v == 0) || (v == 1), "invariant");
4943 if (v != 0) return OS_OK;
4944
4945 // Do this the hard way by blocking ...
4946 // TODO: consider a brief spin here, gated on the success of recent
4947 // spin attempts by this thread.
4948 //
4949 // We decompose long timeouts into series of shorter timed waits.
4950 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4951 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4952 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4953 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4954 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4955 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4956 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4957 // for the already waited time. This policy does not admit any new outcomes.
4958 // In the future, however, we might want to track the accumulated wait time and
4959 // adjust Millis accordingly if we encounter a spurious wakeup.
4960
4961 const int MAXTIMEOUT = 0x10000000;
4962 DWORD rv = WAIT_TIMEOUT;
4963 while (_Event < 0 && Millis > 0) {
4964 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4965 if (Millis > MAXTIMEOUT) {
4966 prd = MAXTIMEOUT;
4967 }
4968 rv = ::WaitForSingleObject(_ParkHandle, prd);
4969 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4970 if (rv == WAIT_TIMEOUT) {
4971 Millis -= prd;
4972 }
4973 }
4974 v = _Event;
4975 _Event = 0;
4976 // see comment at end of os::PlatformEvent::park() below:
4977 OrderAccess::fence();
4978 // If we encounter a nearly simultanous timeout expiry and unpark()
4979 // we return OS_OK indicating we awoke via unpark().
4980 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4981 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4982 }
4983
4984 void os::PlatformEvent::park() {
4985 // Transitions for _Event:
4986 // -1 => -1 : illegal
4987 // 1 => 0 : pass - return immediately
4988 // 0 => -1 : block; then set _Event to 0 before returning
4989
4990 guarantee(_ParkHandle != NULL, "Invariant");
4991 // Invariant: Only the thread associated with the Event/PlatformEvent
4992 // may call park().
4993 // Consider: use atomic decrement instead of CAS-loop
4994 int v;
4995 for (;;) {
4996 v = _Event;
4997 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4998 }
4999 guarantee((v == 0) || (v == 1), "invariant");
5000 if (v != 0) return;
5001
5002 // Do this the hard way by blocking ...
5003 // TODO: consider a brief spin here, gated on the success of recent
5004 // spin attempts by this thread.
5005 while (_Event < 0) {
5006 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5007 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5008 }
5009
5010 // Usually we'll find _Event == 0 at this point, but as
5011 // an optional optimization we clear it, just in case can
5012 // multiple unpark() operations drove _Event up to 1.
5013 _Event = 0;
5014 OrderAccess::fence();
5015 guarantee(_Event >= 0, "invariant");
5016 }
5017
5018 void os::PlatformEvent::unpark() {
5019 guarantee(_ParkHandle != NULL, "Invariant");
5020
5021 // Transitions for _Event:
5022 // 0 => 1 : just return
5023 // 1 => 1 : just return
5024 // -1 => either 0 or 1; must signal target thread
5025 // That is, we can safely transition _Event from -1 to either
5026 // 0 or 1.
5027 // See also: "Semaphores in Plan 9" by Mullender & Cox
5028 //
5029 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5030 // that it will take two back-to-back park() calls for the owning
5031 // thread to block. This has the benefit of forcing a spurious return
5032 // from the first park() call after an unpark() call which will help
5033 // shake out uses of park() and unpark() without condition variables.
5034
5035 if (Atomic::xchg(1, &_Event) >= 0) return;
5036
5037 ::SetEvent(_ParkHandle);
5038 }
5039
5040
5041 // JSR166
5042 // -------------------------------------------------------
5043
5044 // The Windows implementation of Park is very straightforward: Basic
5045 // operations on Win32 Events turn out to have the right semantics to
5046 // use them directly. We opportunistically resuse the event inherited
5047 // from Monitor.
5048
5049 void Parker::park(bool isAbsolute, jlong time) {
5050 guarantee(_ParkEvent != NULL, "invariant");
5051 // First, demultiplex/decode time arguments
5052 if (time < 0) { // don't wait
5053 return;
5054 } else if (time == 0 && !isAbsolute) {
5055 time = INFINITE;
5056 } else if (isAbsolute) {
5057 time -= os::javaTimeMillis(); // convert to relative time
5058 if (time <= 0) { // already elapsed
5059 return;
5060 }
5061 } else { // relative
5062 time /= 1000000; // Must coarsen from nanos to millis
5063 if (time == 0) { // Wait for the minimal time unit if zero
5064 time = 1;
5065 }
5066 }
5067
5068 JavaThread* thread = (JavaThread*)(Thread::current());
5069 assert(thread->is_Java_thread(), "Must be JavaThread");
5070 JavaThread *jt = (JavaThread *)thread;
5071
5072 // Don't wait if interrupted or already triggered
5073 if (Thread::is_interrupted(thread, false) ||
5074 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5075 ResetEvent(_ParkEvent);
5076 return;
5077 } else {
5078 ThreadBlockInVM tbivm(jt);
5079 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5080 jt->set_suspend_equivalent();
5081
5082 WaitForSingleObject(_ParkEvent, time);
5083 ResetEvent(_ParkEvent);
5084
5085 // If externally suspended while waiting, re-suspend
5086 if (jt->handle_special_suspend_equivalent_condition()) {
5087 jt->java_suspend_self();
5088 }
5089 }
5090 }
5091
5092 void Parker::unpark() {
5093 guarantee(_ParkEvent != NULL, "invariant");
5094 SetEvent(_ParkEvent);
5095 }
5096
5097 // Run the specified command in a separate process. Return its exit value,
5098 // or -1 on failure (e.g. can't create a new process).
5099 int os::fork_and_exec(char* cmd) {
5100 STARTUPINFO si;
5101 PROCESS_INFORMATION pi;
5102
5103 memset(&si, 0, sizeof(si));
5104 si.cb = sizeof(si);
5105 memset(&pi, 0, sizeof(pi));
5106 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5107 cmd, // command line
5108 NULL, // process security attribute
5109 NULL, // thread security attribute
5110 TRUE, // inherits system handles
5111 0, // no creation flags
5112 NULL, // use parent's environment block
5113 NULL, // use parent's starting directory
5114 &si, // (in) startup information
5115 &pi); // (out) process information
5116
5117 if (rslt) {
5118 // Wait until child process exits.
5119 WaitForSingleObject(pi.hProcess, INFINITE);
5120
5121 DWORD exit_code;
5122 GetExitCodeProcess(pi.hProcess, &exit_code);
5123
5124 // Close process and thread handles.
5125 CloseHandle(pi.hProcess);
5126 CloseHandle(pi.hThread);
5127
5128 return (int)exit_code;
5129 } else {
5130 return -1;
5131 }
5132 }
5133
5134 //--------------------------------------------------------------------------------------------------
5135 // Non-product code
5136
5137 static int mallocDebugIntervalCounter = 0;
5138 static int mallocDebugCounter = 0;
5139 bool os::check_heap(bool force) {
5140 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5141 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5142 // Note: HeapValidate executes two hardware breakpoints when it finds something
5143 // wrong; at these points, eax contains the address of the offending block (I think).
5144 // To get to the exlicit error message(s) below, just continue twice.
5145 HANDLE heap = GetProcessHeap();
5146
5147 // If we fail to lock the heap, then gflags.exe has been used
5148 // or some other special heap flag has been set that prevents
5149 // locking. We don't try to walk a heap we can't lock.
5150 if (HeapLock(heap) != 0) {
5151 PROCESS_HEAP_ENTRY phe;
5152 phe.lpData = NULL;
5153 while (HeapWalk(heap, &phe) != 0) {
5154 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5155 !HeapValidate(heap, 0, phe.lpData)) {
5156 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5157 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5158 fatal("corrupted C heap");
5159 }
5160 }
5161 DWORD err = GetLastError();
5162 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5163 fatal(err_msg("heap walk aborted with error %d", err));
5164 }
5165 HeapUnlock(heap);
5166 }
5167 mallocDebugIntervalCounter = 0;
5168 }
5169 return true;
5170 }
5171
5172
5173 bool os::find(address addr, outputStream* st) {
5174 // Nothing yet
5175 return false;
5176 }
5177
5178 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5179 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5180
5181 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5182 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5183 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5184 address addr = (address) exceptionRecord->ExceptionInformation[1];
5185
5186 if (os::is_memory_serialize_page(thread, addr)) {
5187 return EXCEPTION_CONTINUE_EXECUTION;
5188 }
5189 }
5190
5191 return EXCEPTION_CONTINUE_SEARCH;
5192 }
5193
5194 // We don't build a headless jre for Windows
5195 bool os::is_headless_jre() { return false; }
5196
5197 static jint initSock() {
5198 WSADATA wsadata;
5199
5200 if (!os::WinSock2Dll::WinSock2Available()) {
5201 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5202 ::GetLastError());
5203 return JNI_ERR;
5204 }
5205
5206 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5207 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5208 ::GetLastError());
5209 return JNI_ERR;
5210 }
5211 return JNI_OK;
5212 }
5213
5214 struct hostent* os::get_host_by_name(char* name) {
5215 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5216 }
5217
5218 int os::socket_close(int fd) {
5219 return ::closesocket(fd);
5220 }
5221
5222 int os::socket(int domain, int type, int protocol) {
5223 return ::socket(domain, type, protocol);
5224 }
5225
5226 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5227 return ::connect(fd, him, len);
5228 }
5229
5230 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5231 return ::recv(fd, buf, (int)nBytes, flags);
5232 }
5233
5234 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5235 return ::send(fd, buf, (int)nBytes, flags);
5236 }
5237
5238 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5239 return ::send(fd, buf, (int)nBytes, flags);
5240 }
5241
5242 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5243 #if defined(IA32)
5244 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5245 #elif defined (AMD64)
5246 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5247 #endif
5248
5249 // returns true if thread could be suspended,
5250 // false otherwise
5251 static bool do_suspend(HANDLE* h) {
5252 if (h != NULL) {
5253 if (SuspendThread(*h) != ~0) {
5254 return true;
5255 }
5256 }
5257 return false;
5258 }
5259
5260 // resume the thread
5261 // calling resume on an active thread is a no-op
5262 static void do_resume(HANDLE* h) {
5263 if (h != NULL) {
5264 ResumeThread(*h);
5265 }
5266 }
5267
5268 // retrieve a suspend/resume context capable handle
5269 // from the tid. Caller validates handle return value.
5270 void get_thread_handle_for_extended_context(HANDLE* h,
5271 OSThread::thread_id_t tid) {
5272 if (h != NULL) {
5273 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5274 }
5275 }
5276
5277 // Thread sampling implementation
5278 //
5279 void os::SuspendedThreadTask::internal_do_task() {
5280 CONTEXT ctxt;
5281 HANDLE h = NULL;
5282
5283 // get context capable handle for thread
5284 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5285
5286 // sanity
5287 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5288 return;
5289 }
5290
5291 // suspend the thread
5292 if (do_suspend(&h)) {
5293 ctxt.ContextFlags = sampling_context_flags;
5294 // get thread context
5295 GetThreadContext(h, &ctxt);
5296 SuspendedThreadTaskContext context(_thread, &ctxt);
5297 // pass context to Thread Sampling impl
5298 do_task(context);
5299 // resume thread
5300 do_resume(&h);
5301 }
5302
5303 // close handle
5304 CloseHandle(h);
5305 }
5306
5307
5308 // Kernel32 API
5309 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5310 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5311 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5312 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5313 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5314
5315 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5316 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5317 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5318 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5319 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5320
5321
5322 BOOL os::Kernel32Dll::initialized = FALSE;
5323 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5324 assert(initialized && _GetLargePageMinimum != NULL,
5325 "GetLargePageMinimumAvailable() not yet called");
5326 return _GetLargePageMinimum();
5327 }
5328
5329 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5330 if (!initialized) {
5331 initialize();
5332 }
5333 return _GetLargePageMinimum != NULL;
5334 }
5335
5336 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5337 if (!initialized) {
5338 initialize();
5339 }
5340 return _VirtualAllocExNuma != NULL;
5341 }
5342
5343 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5344 SIZE_T bytes, DWORD flags,
5345 DWORD prot, DWORD node) {
5346 assert(initialized && _VirtualAllocExNuma != NULL,
5347 "NUMACallsAvailable() not yet called");
5348
5349 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5350 }
5351
5352 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5353 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5354 "NUMACallsAvailable() not yet called");
5355
5356 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5357 }
5358
5359 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5360 PULONGLONG proc_mask) {
5361 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5362 "NUMACallsAvailable() not yet called");
5363
5364 return _GetNumaNodeProcessorMask(node, proc_mask);
5365 }
5366
5367 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5368 ULONG FrameToCapture,
5369 PVOID* BackTrace,
5370 PULONG BackTraceHash) {
5371 if (!initialized) {
5372 initialize();
5373 }
5374
5375 if (_RtlCaptureStackBackTrace != NULL) {
5376 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5377 BackTrace, BackTraceHash);
5378 } else {
5379 return 0;
5380 }
5381 }
5382
5383 void os::Kernel32Dll::initializeCommon() {
5384 if (!initialized) {
5385 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5386 assert(handle != NULL, "Just check");
5387 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5388 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5389 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5390 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5391 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5392 initialized = TRUE;
5393 }
5394 }
5395
5396
5397
5398 #ifndef JDK6_OR_EARLIER
5399
5400 void os::Kernel32Dll::initialize() {
5401 initializeCommon();
5402 }
5403
5404
5405 // Kernel32 API
5406 inline BOOL os::Kernel32Dll::SwitchToThread() {
5407 return ::SwitchToThread();
5408 }
5409
5410 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5411 return true;
5412 }
5413
5414 // Help tools
5415 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5416 return true;
5417 }
5418
5419 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5420 DWORD th32ProcessId) {
5421 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5422 }
5423
5424 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5425 LPMODULEENTRY32 lpme) {
5426 return ::Module32First(hSnapshot, lpme);
5427 }
5428
5429 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5430 LPMODULEENTRY32 lpme) {
5431 return ::Module32Next(hSnapshot, lpme);
5432 }
5433
5434 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5435 ::GetNativeSystemInfo(lpSystemInfo);
5436 }
5437
5438 // PSAPI API
5439 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5440 HMODULE *lpModule, DWORD cb,
5441 LPDWORD lpcbNeeded) {
5442 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5443 }
5444
5445 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5446 HMODULE hModule,
5447 LPTSTR lpFilename,
5448 DWORD nSize) {
5449 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5450 }
5451
5452 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5453 HMODULE hModule,
5454 LPMODULEINFO lpmodinfo,
5455 DWORD cb) {
5456 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5457 }
5458
5459 inline BOOL os::PSApiDll::PSApiAvailable() {
5460 return true;
5461 }
5462
5463
5464 // WinSock2 API
5465 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5466 LPWSADATA lpWSAData) {
5467 return ::WSAStartup(wVersionRequested, lpWSAData);
5468 }
5469
5470 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5471 return ::gethostbyname(name);
5472 }
5473
5474 inline BOOL os::WinSock2Dll::WinSock2Available() {
5475 return true;
5476 }
5477
5478 // Advapi API
5479 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5480 BOOL DisableAllPrivileges,
5481 PTOKEN_PRIVILEGES NewState,
5482 DWORD BufferLength,
5483 PTOKEN_PRIVILEGES PreviousState,
5484 PDWORD ReturnLength) {
5485 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5486 BufferLength, PreviousState, ReturnLength);
5487 }
5488
5489 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5490 DWORD DesiredAccess,
5491 PHANDLE TokenHandle) {
5492 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5493 }
5494
5495 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5496 LPCTSTR lpName,
5497 PLUID lpLuid) {
5498 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5499 }
5500
5501 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5502 return true;
5503 }
5504
5505 void* os::get_default_process_handle() {
5506 return (void*)GetModuleHandle(NULL);
5507 }
5508
5509 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5510 // which is used to find statically linked in agents.
5511 // Additionally for windows, takes into account __stdcall names.
5512 // Parameters:
5513 // sym_name: Symbol in library we are looking for
5514 // lib_name: Name of library to look in, NULL for shared libs.
5515 // is_absolute_path == true if lib_name is absolute path to agent
5516 // such as "C:/a/b/L.dll"
5517 // == false if only the base name of the library is passed in
5518 // such as "L"
5519 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5520 bool is_absolute_path) {
5521 char *agent_entry_name;
5522 size_t len;
5523 size_t name_len;
5524 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5525 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5526 const char *start;
5527
5528 if (lib_name != NULL) {
5529 len = name_len = strlen(lib_name);
5530 if (is_absolute_path) {
5531 // Need to strip path, prefix and suffix
5532 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5533 lib_name = ++start;
5534 } else {
5535 // Need to check for drive prefix
5536 if ((start = strchr(lib_name, ':')) != NULL) {
5537 lib_name = ++start;
5538 }
5539 }
5540 if (len <= (prefix_len + suffix_len)) {
5541 return NULL;
5542 }
5543 lib_name += prefix_len;
5544 name_len = strlen(lib_name) - suffix_len;
5545 }
5546 }
5547 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5548 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5549 if (agent_entry_name == NULL) {
5550 return NULL;
5551 }
5552 if (lib_name != NULL) {
5553 const char *p = strrchr(sym_name, '@');
5554 if (p != NULL && p != sym_name) {
5555 // sym_name == _Agent_OnLoad@XX
5556 strncpy(agent_entry_name, sym_name, (p - sym_name));
5557 agent_entry_name[(p-sym_name)] = '\0';
5558 // agent_entry_name == _Agent_OnLoad
5559 strcat(agent_entry_name, "_");
5560 strncat(agent_entry_name, lib_name, name_len);
5561 strcat(agent_entry_name, p);
5562 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5563 } else {
5564 strcpy(agent_entry_name, sym_name);
5565 strcat(agent_entry_name, "_");
5566 strncat(agent_entry_name, lib_name, name_len);
5567 }
5568 } else {
5569 strcpy(agent_entry_name, sym_name);
5570 }
5571 return agent_entry_name;
5572 }
5573
5574 #else
5575 // Kernel32 API
5576 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5577 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5578 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5579 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5580 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5581
5582 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5583 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5584 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5585 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5586 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5587
5588 void os::Kernel32Dll::initialize() {
5589 if (!initialized) {
5590 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5591 assert(handle != NULL, "Just check");
5592
5593 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5594 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5595 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5596 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5597 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5598 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5599 initializeCommon(); // resolve the functions that always need resolving
5600
5601 initialized = TRUE;
5602 }
5603 }
5604
5605 BOOL os::Kernel32Dll::SwitchToThread() {
5606 assert(initialized && _SwitchToThread != NULL,
5607 "SwitchToThreadAvailable() not yet called");
5608 return _SwitchToThread();
5609 }
5610
5611
5612 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5613 if (!initialized) {
5614 initialize();
5615 }
5616 return _SwitchToThread != NULL;
5617 }
5618
5619 // Help tools
5620 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5621 if (!initialized) {
5622 initialize();
5623 }
5624 return _CreateToolhelp32Snapshot != NULL &&
5625 _Module32First != NULL &&
5626 _Module32Next != NULL;
5627 }
5628
5629 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5630 DWORD th32ProcessId) {
5631 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5632 "HelpToolsAvailable() not yet called");
5633
5634 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5635 }
5636
5637 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5638 assert(initialized && _Module32First != NULL,
5639 "HelpToolsAvailable() not yet called");
5640
5641 return _Module32First(hSnapshot, lpme);
5642 }
5643
5644 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5645 LPMODULEENTRY32 lpme) {
5646 assert(initialized && _Module32Next != NULL,
5647 "HelpToolsAvailable() not yet called");
5648
5649 return _Module32Next(hSnapshot, lpme);
5650 }
5651
5652
5653 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5654 if (!initialized) {
5655 initialize();
5656 }
5657 return _GetNativeSystemInfo != NULL;
5658 }
5659
5660 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5661 assert(initialized && _GetNativeSystemInfo != NULL,
5662 "GetNativeSystemInfoAvailable() not yet called");
5663
5664 _GetNativeSystemInfo(lpSystemInfo);
5665 }
5666
5667 // PSAPI API
5668
5669
5670 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5671 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5672 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5673
5674 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5675 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5676 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5677 BOOL os::PSApiDll::initialized = FALSE;
5678
5679 void os::PSApiDll::initialize() {
5680 if (!initialized) {
5681 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5682 if (handle != NULL) {
5683 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5684 "EnumProcessModules");
5685 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5686 "GetModuleFileNameExA");
5687 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5688 "GetModuleInformation");
5689 }
5690 initialized = TRUE;
5691 }
5692 }
5693
5694
5695
5696 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5697 DWORD cb, LPDWORD lpcbNeeded) {
5698 assert(initialized && _EnumProcessModules != NULL,
5699 "PSApiAvailable() not yet called");
5700 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5701 }
5702
5703 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5704 LPTSTR lpFilename, DWORD nSize) {
5705 assert(initialized && _GetModuleFileNameEx != NULL,
5706 "PSApiAvailable() not yet called");
5707 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5708 }
5709
5710 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5711 LPMODULEINFO lpmodinfo, DWORD cb) {
5712 assert(initialized && _GetModuleInformation != NULL,
5713 "PSApiAvailable() not yet called");
5714 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5715 }
5716
5717 BOOL os::PSApiDll::PSApiAvailable() {
5718 if (!initialized) {
5719 initialize();
5720 }
5721 return _EnumProcessModules != NULL &&
5722 _GetModuleFileNameEx != NULL &&
5723 _GetModuleInformation != NULL;
5724 }
5725
5726
5727 // WinSock2 API
5728 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5729 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5730
5731 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5732 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5733 BOOL os::WinSock2Dll::initialized = FALSE;
5734
5735 void os::WinSock2Dll::initialize() {
5736 if (!initialized) {
5737 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5738 if (handle != NULL) {
5739 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5740 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5741 }
5742 initialized = TRUE;
5743 }
5744 }
5745
5746
5747 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5748 assert(initialized && _WSAStartup != NULL,
5749 "WinSock2Available() not yet called");
5750 return _WSAStartup(wVersionRequested, lpWSAData);
5751 }
5752
5753 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5754 assert(initialized && _gethostbyname != NULL,
5755 "WinSock2Available() not yet called");
5756 return _gethostbyname(name);
5757 }
5758
5759 BOOL os::WinSock2Dll::WinSock2Available() {
5760 if (!initialized) {
5761 initialize();
5762 }
5763 return _WSAStartup != NULL &&
5764 _gethostbyname != NULL;
5765 }
5766
5767 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5768 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5769 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5770
5771 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5772 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5773 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5774 BOOL os::Advapi32Dll::initialized = FALSE;
5775
5776 void os::Advapi32Dll::initialize() {
5777 if (!initialized) {
5778 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5779 if (handle != NULL) {
5780 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5781 "AdjustTokenPrivileges");
5782 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5783 "OpenProcessToken");
5784 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5785 "LookupPrivilegeValueA");
5786 }
5787 initialized = TRUE;
5788 }
5789 }
5790
5791 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5792 BOOL DisableAllPrivileges,
5793 PTOKEN_PRIVILEGES NewState,
5794 DWORD BufferLength,
5795 PTOKEN_PRIVILEGES PreviousState,
5796 PDWORD ReturnLength) {
5797 assert(initialized && _AdjustTokenPrivileges != NULL,
5798 "AdvapiAvailable() not yet called");
5799 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5800 BufferLength, PreviousState, ReturnLength);
5801 }
5802
5803 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5804 DWORD DesiredAccess,
5805 PHANDLE TokenHandle) {
5806 assert(initialized && _OpenProcessToken != NULL,
5807 "AdvapiAvailable() not yet called");
5808 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5809 }
5810
5811 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5812 LPCTSTR lpName, PLUID lpLuid) {
5813 assert(initialized && _LookupPrivilegeValue != NULL,
5814 "AdvapiAvailable() not yet called");
5815 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5816 }
5817
5818 BOOL os::Advapi32Dll::AdvapiAvailable() {
5819 if (!initialized) {
5820 initialize();
5821 }
5822 return _AdjustTokenPrivileges != NULL &&
5823 _OpenProcessToken != NULL &&
5824 _LookupPrivilegeValue != NULL;
5825 }
5826
5827 #endif
5828
5829 #ifndef PRODUCT
5830
5831 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5832 // contiguous memory block at a particular address.
5833 // The test first tries to find a good approximate address to allocate at by using the same
5834 // method to allocate some memory at any address. The test then tries to allocate memory in
5835 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5836 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5837 // the previously allocated memory is available for allocation. The only actual failure
5838 // that is reported is when the test tries to allocate at a particular location but gets a
5839 // different valid one. A NULL return value at this point is not considered an error but may
5840 // be legitimate.
5841 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5842 void TestReserveMemorySpecial_test() {
5843 if (!UseLargePages) {
5844 if (VerboseInternalVMTests) {
5845 gclog_or_tty->print("Skipping test because large pages are disabled");
5846 }
5847 return;
5848 }
5849 // save current value of globals
5850 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5851 bool old_use_numa_interleaving = UseNUMAInterleaving;
5852
5853 // set globals to make sure we hit the correct code path
5854 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5855
5856 // do an allocation at an address selected by the OS to get a good one.
5857 const size_t large_allocation_size = os::large_page_size() * 4;
5858 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5859 if (result == NULL) {
5860 if (VerboseInternalVMTests) {
5861 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5862 large_allocation_size);
5863 }
5864 } else {
5865 os::release_memory_special(result, large_allocation_size);
5866
5867 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5868 // we managed to get it once.
5869 const size_t expected_allocation_size = os::large_page_size();
5870 char* expected_location = result + os::large_page_size();
5871 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5872 if (actual_location == NULL) {
5873 if (VerboseInternalVMTests) {
5874 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5875 expected_location, large_allocation_size);
5876 }
5877 } else {
5878 // release memory
5879 os::release_memory_special(actual_location, expected_allocation_size);
5880 // only now check, after releasing any memory to avoid any leaks.
5881 assert(actual_location == expected_location,
5882 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5883 expected_location, expected_allocation_size, actual_location));
5884 }
5885 }
5886
5887 // restore globals
5888 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5889 UseNUMAInterleaving = old_use_numa_interleaving;
5890 }
5891 #endif // PRODUCT
5892