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 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
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 "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
75
76
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
83
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
94
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
106
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
111
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #elif _M_AMD64
115 #define __CPU__ amd64
116 #else
117 #define __CPU__ i486
118 #endif
119
120 // save DLL module handle, used by GetModuleFileName
121
122 HINSTANCE vm_lib_handle;
123
124 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
125 switch (reason) {
126 case DLL_PROCESS_ATTACH:
127 vm_lib_handle = hinst;
128 if(ForceTimeHighResolution)
129 timeBeginPeriod(1L);
130 break;
131 case DLL_PROCESS_DETACH:
132 if(ForceTimeHighResolution)
133 timeEndPeriod(1L);
134
135 break;
136 default:
137 break;
138 }
139 return true;
140 }
141
142 static inline double fileTimeAsDouble(FILETIME* time) {
143 const double high = (double) ((unsigned int) ~0);
144 const double split = 10000000.0;
145 double result = (time->dwLowDateTime / split) +
146 time->dwHighDateTime * (high/split);
147 return result;
148 }
149
150 // Implementation of os
151
152 bool os::getenv(const char* name, char* buffer, int len) {
153 int result = GetEnvironmentVariable(name, buffer, len);
154 return result > 0 && result < len;
155 }
156
157 bool os::unsetenv(const char* name) {
158 assert(name != NULL, "Null pointer");
159 return (SetEnvironmentVariable(name, NULL) == TRUE);
160 }
161
162 // No setuid programs under Windows.
163 bool os::have_special_privileges() {
164 return false;
165 }
166
167
168 // This method is a periodic task to check for misbehaving JNI applications
169 // under CheckJNI, we can add any periodic checks here.
170 // For Windows at the moment does nothing
171 void os::run_periodic_checks() {
172 return;
173 }
174
175 #ifndef _WIN64
176 // previous UnhandledExceptionFilter, if there is one
177 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
178
179 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
180 #endif
181 void os::init_system_properties_values() {
182 /* sysclasspath, java_home, dll_dir */
183 {
184 char *home_path;
185 char *dll_path;
186 char *pslash;
187 char *bin = "\\bin";
188 char home_dir[MAX_PATH];
189
190 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
191 os::jvm_path(home_dir, sizeof(home_dir));
192 // Found the full path to jvm.dll.
193 // Now cut the path to <java_home>/jre if we can.
194 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
195 pslash = strrchr(home_dir, '\\');
196 if (pslash != NULL) {
197 *pslash = '\0'; /* get rid of \{client|server} */
198 pslash = strrchr(home_dir, '\\');
199 if (pslash != NULL)
200 *pslash = '\0'; /* get rid of \bin */
201 }
202 }
203
204 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
205 if (home_path == NULL)
206 return;
207 strcpy(home_path, home_dir);
208 Arguments::set_java_home(home_path);
209
210 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
211 if (dll_path == NULL)
212 return;
213 strcpy(dll_path, home_dir);
214 strcat(dll_path, bin);
215 Arguments::set_dll_dir(dll_path);
216
217 if (!set_boot_path('\\', ';'))
218 return;
219 }
220
221 /* library_path */
222 #define EXT_DIR "\\lib\\ext"
223 #define BIN_DIR "\\bin"
224 #define PACKAGE_DIR "\\Sun\\Java"
225 {
226 /* Win32 library search order (See the documentation for LoadLibrary):
227 *
228 * 1. The directory from which application is loaded.
229 * 2. The system wide Java Extensions directory (Java only)
230 * 3. System directory (GetSystemDirectory)
231 * 4. Windows directory (GetWindowsDirectory)
232 * 5. The PATH environment variable
233 * 6. The current directory
234 */
235
236 char *library_path;
237 char tmp[MAX_PATH];
238 char *path_str = ::getenv("PATH");
239
240 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
241 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
242
243 library_path[0] = '\0';
244
245 GetModuleFileName(NULL, tmp, sizeof(tmp));
246 *(strrchr(tmp, '\\')) = '\0';
247 strcat(library_path, tmp);
248
249 GetWindowsDirectory(tmp, sizeof(tmp));
250 strcat(library_path, ";");
251 strcat(library_path, tmp);
252 strcat(library_path, PACKAGE_DIR BIN_DIR);
253
254 GetSystemDirectory(tmp, sizeof(tmp));
255 strcat(library_path, ";");
256 strcat(library_path, tmp);
257
258 GetWindowsDirectory(tmp, sizeof(tmp));
259 strcat(library_path, ";");
260 strcat(library_path, tmp);
261
262 if (path_str) {
263 strcat(library_path, ";");
264 strcat(library_path, path_str);
265 }
266
267 strcat(library_path, ";.");
268
269 Arguments::set_library_path(library_path);
270 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
271 }
272
273 /* Default extensions directory */
274 {
275 char path[MAX_PATH];
276 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
277 GetWindowsDirectory(path, MAX_PATH);
278 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
279 path, PACKAGE_DIR, EXT_DIR);
280 Arguments::set_ext_dirs(buf);
281 }
282 #undef EXT_DIR
283 #undef BIN_DIR
284 #undef PACKAGE_DIR
285
286 /* Default endorsed standards directory. */
287 {
288 #define ENDORSED_DIR "\\lib\\endorsed"
289 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
290 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
291 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
292 Arguments::set_endorsed_dirs(buf);
293 #undef ENDORSED_DIR
294 }
295
296 #ifndef _WIN64
297 // set our UnhandledExceptionFilter and save any previous one
298 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
299 #endif
300
301 // Done
302 return;
303 }
304
305 void os::breakpoint() {
306 DebugBreak();
307 }
308
309 // Invoked from the BREAKPOINT Macro
310 extern "C" void breakpoint() {
311 os::breakpoint();
312 }
313
314 /*
315 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 * So far, this method is only used by Native Memory Tracking, which is
317 * only supported on Windows XP or later.
318 */
319
320 int os::get_native_stack(address* stack, int frames, int toSkip) {
321 #ifdef _NMT_NOINLINE_
322 toSkip ++;
323 #endif
324 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
325 (PVOID*)stack, NULL);
326 for (int index = captured; index < frames; index ++) {
327 stack[index] = NULL;
328 }
329 return captured;
330 }
331
332
333 // os::current_stack_base()
334 //
335 // Returns the base of the stack, which is the stack's
336 // starting address. This function must be called
337 // while running on the stack of the thread being queried.
338
339 address os::current_stack_base() {
340 MEMORY_BASIC_INFORMATION minfo;
341 address stack_bottom;
342 size_t stack_size;
343
344 VirtualQuery(&minfo, &minfo, sizeof(minfo));
345 stack_bottom = (address)minfo.AllocationBase;
346 stack_size = minfo.RegionSize;
347
348 // Add up the sizes of all the regions with the same
349 // AllocationBase.
350 while( 1 )
351 {
352 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
353 if ( stack_bottom == (address)minfo.AllocationBase )
354 stack_size += minfo.RegionSize;
355 else
356 break;
357 }
358
359 #ifdef _M_IA64
360 // IA64 has memory and register stacks
361 //
362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
363 // at thread creation (1MB backing store growing upwards, 1MB memory stack
364 // growing downwards, 2MB summed up)
365 //
366 // ...
367 // ------- top of stack (high address) -----
368 // |
369 // | 1MB
370 // | Backing Store (Register Stack)
371 // |
372 // | / \
373 // | |
374 // | |
375 // | |
376 // ------------------------ stack base -----
377 // | 1MB
378 // | Memory Stack
379 // |
380 // | |
381 // | |
382 // | |
383 // | \ /
384 // |
385 // ----- bottom of stack (low address) -----
386 // ...
387
388 stack_size = stack_size / 2;
389 #endif
390 return stack_bottom + stack_size;
391 }
392
393 size_t os::current_stack_size() {
394 size_t sz;
395 MEMORY_BASIC_INFORMATION minfo;
396 VirtualQuery(&minfo, &minfo, sizeof(minfo));
397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
398 return sz;
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
411
412 // Thread start routine for all new Java threads
413 static unsigned __stdcall java_start(Thread* thread) {
414 // Try to randomize the cache line index of hot stack frames.
415 // This helps when threads of the same stack traces evict each other's
416 // cache lines. The threads can be either from the same JVM instance, or
417 // from different JVM instances. The benefit is especially true for
418 // processors with hyperthreading technology.
419 static int counter = 0;
420 int pid = os::current_process_id();
421 _alloca(((pid ^ counter++) & 7) * 128);
422
423 OSThread* osthr = thread->osthread();
424 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
425
426 if (UseNUMA) {
427 int lgrp_id = os::numa_get_group_id();
428 if (lgrp_id != -1) {
429 thread->set_lgrp_id(lgrp_id);
430 }
431 }
432
433
434 // Install a win32 structured exception handler around every thread created
435 // by VM, so VM can genrate error dump when an exception occurred in non-
436 // Java thread (e.g. VM thread).
437 __try {
438 thread->run();
439 } __except(topLevelExceptionFilter(
440 (_EXCEPTION_POINTERS*)_exception_info())) {
441 // Nothing to do.
442 }
443
444 // One less thread is executing
445 // When the VMThread gets here, the main thread may have already exited
446 // which frees the CodeHeap containing the Atomic::add code
447 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
448 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
449 }
450
451 return 0;
452 }
453
454 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
455 // Allocate the OSThread object
456 OSThread* osthread = new OSThread(NULL, NULL);
457 if (osthread == NULL) return NULL;
458
459 // Initialize support for Java interrupts
460 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
461 if (interrupt_event == NULL) {
462 delete osthread;
463 return NULL;
464 }
465 osthread->set_interrupt_event(interrupt_event);
466
467 // Store info on the Win32 thread into the OSThread
468 osthread->set_thread_handle(thread_handle);
469 osthread->set_thread_id(thread_id);
470
471 if (UseNUMA) {
472 int lgrp_id = os::numa_get_group_id();
473 if (lgrp_id != -1) {
474 thread->set_lgrp_id(lgrp_id);
475 }
476 }
477
478 // Initial thread state is INITIALIZED, not SUSPENDED
479 osthread->set_state(INITIALIZED);
480
481 return osthread;
482 }
483
484
485 bool os::create_attached_thread(JavaThread* thread) {
486 #ifdef ASSERT
487 thread->verify_not_published();
488 #endif
489 HANDLE thread_h;
490 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
491 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
492 fatal("DuplicateHandle failed\n");
493 }
494 OSThread* osthread = create_os_thread(thread, thread_h,
495 (int)current_thread_id());
496 if (osthread == NULL) {
497 return false;
498 }
499
500 // Initial thread state is RUNNABLE
501 osthread->set_state(RUNNABLE);
502
503 thread->set_osthread(osthread);
504 return true;
505 }
506
507 bool os::create_main_thread(JavaThread* thread) {
508 #ifdef ASSERT
509 thread->verify_not_published();
510 #endif
511 if (_starting_thread == NULL) {
512 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
513 if (_starting_thread == NULL) {
514 return false;
515 }
516 }
517
518 // The primordial thread is runnable from the start)
519 _starting_thread->set_state(RUNNABLE);
520
521 thread->set_osthread(_starting_thread);
522 return true;
523 }
524
525 // Allocate and initialize a new OSThread
526 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
527 unsigned thread_id;
528
529 // Allocate the OSThread object
530 OSThread* osthread = new OSThread(NULL, NULL);
531 if (osthread == NULL) {
532 return false;
533 }
534
535 // Initialize support for Java interrupts
536 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
537 if (interrupt_event == NULL) {
538 delete osthread;
539 return NULL;
540 }
541 osthread->set_interrupt_event(interrupt_event);
542 osthread->set_interrupted(false);
543
544 thread->set_osthread(osthread);
545
546 if (stack_size == 0) {
547 switch (thr_type) {
548 case os::java_thread:
549 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
550 if (JavaThread::stack_size_at_create() > 0)
551 stack_size = JavaThread::stack_size_at_create();
552 break;
553 case os::compiler_thread:
554 if (CompilerThreadStackSize > 0) {
555 stack_size = (size_t)(CompilerThreadStackSize * K);
556 break;
557 } // else fall through:
558 // use VMThreadStackSize if CompilerThreadStackSize is not defined
559 case os::vm_thread:
560 case os::pgc_thread:
561 case os::cgc_thread:
562 case os::watcher_thread:
563 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
564 break;
565 }
566 }
567
568 // Create the Win32 thread
569 //
570 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
571 // does not specify stack size. Instead, it specifies the size of
572 // initially committed space. The stack size is determined by
573 // PE header in the executable. If the committed "stack_size" is larger
574 // than default value in the PE header, the stack is rounded up to the
575 // nearest multiple of 1MB. For example if the launcher has default
576 // stack size of 320k, specifying any size less than 320k does not
577 // affect the actual stack size at all, it only affects the initial
578 // commitment. On the other hand, specifying 'stack_size' larger than
579 // default value may cause significant increase in memory usage, because
580 // not only the stack space will be rounded up to MB, but also the
581 // entire space is committed upfront.
582 //
583 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
584 // for CreateThread() that can treat 'stack_size' as stack size. However we
585 // are not supposed to call CreateThread() directly according to MSDN
586 // document because JVM uses C runtime library. The good news is that the
587 // flag appears to work with _beginthredex() as well.
588
589 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
590 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
591 #endif
592
593 HANDLE thread_handle =
594 (HANDLE)_beginthreadex(NULL,
595 (unsigned)stack_size,
596 (unsigned (__stdcall *)(void*)) java_start,
597 thread,
598 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
599 &thread_id);
600 if (thread_handle == NULL) {
601 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
602 // without the flag.
603 thread_handle =
604 (HANDLE)_beginthreadex(NULL,
605 (unsigned)stack_size,
606 (unsigned (__stdcall *)(void*)) java_start,
607 thread,
608 CREATE_SUSPENDED,
609 &thread_id);
610 }
611 if (thread_handle == NULL) {
612 // Need to clean up stuff we've allocated so far
613 CloseHandle(osthread->interrupt_event());
614 thread->set_osthread(NULL);
615 delete osthread;
616 return NULL;
617 }
618
619 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
620
621 // Store info on the Win32 thread into the OSThread
622 osthread->set_thread_handle(thread_handle);
623 osthread->set_thread_id(thread_id);
624
625 // Initial thread state is INITIALIZED, not SUSPENDED
626 osthread->set_state(INITIALIZED);
627
628 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
629 return true;
630 }
631
632
633 // Free Win32 resources related to the OSThread
634 void os::free_thread(OSThread* osthread) {
635 assert(osthread != NULL, "osthread not set");
636 CloseHandle(osthread->thread_handle());
637 CloseHandle(osthread->interrupt_event());
638 delete osthread;
639 }
640
641
642 static int has_performance_count = 0;
643 static jlong first_filetime;
644 static jlong initial_performance_count;
645 static jlong performance_frequency;
646
647
648 jlong as_long(LARGE_INTEGER x) {
649 jlong result = 0; // initialization to avoid warning
650 set_high(&result, x.HighPart);
651 set_low(&result, x.LowPart);
652 return result;
653 }
654
655
656 jlong os::elapsed_counter() {
657 LARGE_INTEGER count;
658 if (has_performance_count) {
659 QueryPerformanceCounter(&count);
660 return as_long(count) - initial_performance_count;
661 } else {
662 FILETIME wt;
663 GetSystemTimeAsFileTime(&wt);
664 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
665 }
666 }
667
668
669 jlong os::elapsed_frequency() {
670 if (has_performance_count) {
671 return performance_frequency;
672 } else {
673 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
674 return 10000000;
675 }
676 }
677
678
679 julong os::available_memory() {
680 return win32::available_memory();
681 }
682
683 julong os::win32::available_memory() {
684 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
685 // value if total memory is larger than 4GB
686 MEMORYSTATUSEX ms;
687 ms.dwLength = sizeof(ms);
688 GlobalMemoryStatusEx(&ms);
689
690 return (julong)ms.ullAvailPhys;
691 }
692
693 julong os::physical_memory() {
694 return win32::physical_memory();
695 }
696
697 bool os::has_allocatable_memory_limit(julong* limit) {
698 MEMORYSTATUSEX ms;
699 ms.dwLength = sizeof(ms);
700 GlobalMemoryStatusEx(&ms);
701 #ifdef _LP64
702 *limit = (julong)ms.ullAvailVirtual;
703 return true;
704 #else
705 // Limit to 1400m because of the 2gb address space wall
706 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
707 return true;
708 #endif
709 }
710
711 // VC6 lacks DWORD_PTR
712 #if _MSC_VER < 1300
713 typedef UINT_PTR DWORD_PTR;
714 #endif
715
716 int os::active_processor_count() {
717 DWORD_PTR lpProcessAffinityMask = 0;
718 DWORD_PTR lpSystemAffinityMask = 0;
719 int proc_count = processor_count();
720 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
721 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
722 // Nof active processors is number of bits in process affinity mask
723 int bitcount = 0;
724 while (lpProcessAffinityMask != 0) {
725 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
726 bitcount++;
727 }
728 return bitcount;
729 } else {
730 return proc_count;
731 }
732 }
733
734 void os::set_native_thread_name(const char *name) {
735 // Not yet implemented.
736 return;
737 }
738
739 bool os::distribute_processes(uint length, uint* distribution) {
740 // Not yet implemented.
741 return false;
742 }
743
744 bool os::bind_to_processor(uint processor_id) {
745 // Not yet implemented.
746 return false;
747 }
748
749 static void initialize_performance_counter() {
750 LARGE_INTEGER count;
751 if (QueryPerformanceFrequency(&count)) {
752 has_performance_count = 1;
753 performance_frequency = as_long(count);
754 QueryPerformanceCounter(&count);
755 initial_performance_count = as_long(count);
756 } else {
757 has_performance_count = 0;
758 FILETIME wt;
759 GetSystemTimeAsFileTime(&wt);
760 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
761 }
762 }
763
764
765 double os::elapsedTime() {
766 return (double) elapsed_counter() / (double) elapsed_frequency();
767 }
768
769
770 // Windows format:
771 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
772 // Java format:
773 // Java standards require the number of milliseconds since 1/1/1970
774
775 // Constant offset - calculated using offset()
776 static jlong _offset = 116444736000000000;
777 // Fake time counter for reproducible results when debugging
778 static jlong fake_time = 0;
779
780 #ifdef ASSERT
781 // Just to be safe, recalculate the offset in debug mode
782 static jlong _calculated_offset = 0;
783 static int _has_calculated_offset = 0;
784
785 jlong offset() {
786 if (_has_calculated_offset) return _calculated_offset;
787 SYSTEMTIME java_origin;
788 java_origin.wYear = 1970;
789 java_origin.wMonth = 1;
790 java_origin.wDayOfWeek = 0; // ignored
791 java_origin.wDay = 1;
792 java_origin.wHour = 0;
793 java_origin.wMinute = 0;
794 java_origin.wSecond = 0;
795 java_origin.wMilliseconds = 0;
796 FILETIME jot;
797 if (!SystemTimeToFileTime(&java_origin, &jot)) {
798 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
799 }
800 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
801 _has_calculated_offset = 1;
802 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
803 return _calculated_offset;
804 }
805 #else
806 jlong offset() {
807 return _offset;
808 }
809 #endif
810
811 jlong windows_to_java_time(FILETIME wt) {
812 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
813 return (a - offset()) / 10000;
814 }
815
816 FILETIME java_to_windows_time(jlong l) {
817 jlong a = (l * 10000) + offset();
818 FILETIME result;
819 result.dwHighDateTime = high(a);
820 result.dwLowDateTime = low(a);
821 return result;
822 }
823
824 bool os::supports_vtime() { return true; }
825 bool os::enable_vtime() { return false; }
826 bool os::vtime_enabled() { return false; }
827
828 double os::elapsedVTime() {
829 FILETIME created;
830 FILETIME exited;
831 FILETIME kernel;
832 FILETIME user;
833 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
834 // the resolution of windows_to_java_time() should be sufficient (ms)
835 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
836 } else {
837 return elapsedTime();
838 }
839 }
840
841 jlong os::javaTimeMillis() {
842 if (UseFakeTimers) {
843 return fake_time++;
844 } else {
845 FILETIME wt;
846 GetSystemTimeAsFileTime(&wt);
847 return windows_to_java_time(wt);
848 }
849 }
850
851 jlong os::javaTimeNanos() {
852 if (!has_performance_count) {
853 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
854 } else {
855 LARGE_INTEGER current_count;
856 QueryPerformanceCounter(¤t_count);
857 double current = as_long(current_count);
858 double freq = performance_frequency;
859 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
860 return time;
861 }
862 }
863
864 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
865 if (!has_performance_count) {
866 // javaTimeMillis() doesn't have much percision,
867 // but it is not going to wrap -- so all 64 bits
868 info_ptr->max_value = ALL_64_BITS;
869
870 // this is a wall clock timer, so may skip
871 info_ptr->may_skip_backward = true;
872 info_ptr->may_skip_forward = true;
873 } else {
874 jlong freq = performance_frequency;
875 if (freq < NANOSECS_PER_SEC) {
876 // the performance counter is 64 bits and we will
877 // be multiplying it -- so no wrap in 64 bits
878 info_ptr->max_value = ALL_64_BITS;
879 } else if (freq > NANOSECS_PER_SEC) {
880 // use the max value the counter can reach to
881 // determine the max value which could be returned
882 julong max_counter = (julong)ALL_64_BITS;
883 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
884 } else {
885 // the performance counter is 64 bits and we will
886 // be using it directly -- so no wrap in 64 bits
887 info_ptr->max_value = ALL_64_BITS;
888 }
889
890 // using a counter, so no skipping
891 info_ptr->may_skip_backward = false;
892 info_ptr->may_skip_forward = false;
893 }
894 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
895 }
896
897 char* os::local_time_string(char *buf, size_t buflen) {
898 SYSTEMTIME st;
899 GetLocalTime(&st);
900 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
901 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
902 return buf;
903 }
904
905 bool os::getTimesSecs(double* process_real_time,
906 double* process_user_time,
907 double* process_system_time) {
908 HANDLE h_process = GetCurrentProcess();
909 FILETIME create_time, exit_time, kernel_time, user_time;
910 BOOL result = GetProcessTimes(h_process,
911 &create_time,
912 &exit_time,
913 &kernel_time,
914 &user_time);
915 if (result != 0) {
916 FILETIME wt;
917 GetSystemTimeAsFileTime(&wt);
918 jlong rtc_millis = windows_to_java_time(wt);
919 jlong user_millis = windows_to_java_time(user_time);
920 jlong system_millis = windows_to_java_time(kernel_time);
921 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
922 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
923 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
924 return true;
925 } else {
926 return false;
927 }
928 }
929
930 void os::shutdown() {
931
932 // allow PerfMemory to attempt cleanup of any persistent resources
933 perfMemory_exit();
934
935 // flush buffered output, finish log files
936 ostream_abort();
937
938 // Check for abort hook
939 abort_hook_t abort_hook = Arguments::abort_hook();
940 if (abort_hook != NULL) {
941 abort_hook();
942 }
943 }
944
945
946 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
947 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
948
949 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
950 HINSTANCE dbghelp;
951 EXCEPTION_POINTERS ep;
952 MINIDUMP_EXCEPTION_INFORMATION mei;
953 MINIDUMP_EXCEPTION_INFORMATION* pmei;
954
955 HANDLE hProcess = GetCurrentProcess();
956 DWORD processId = GetCurrentProcessId();
957 HANDLE dumpFile;
958 MINIDUMP_TYPE dumpType;
959 static const char* cwd;
960
961 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
962 #ifndef ASSERT
963 // If running on a client version of Windows and user has not explicitly enabled dumping
964 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
965 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
966 return;
967 // If running on a server version of Windows and user has explictly disabled dumping
968 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
969 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
970 return;
971 }
972 #else
973 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
974 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
975 return;
976 }
977 #endif
978
979 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
980
981 if (dbghelp == NULL) {
982 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
983 return;
984 }
985
986 _MiniDumpWriteDump = CAST_TO_FN_PTR(
987 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
988 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
989 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
990
991 if (_MiniDumpWriteDump == NULL) {
992 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
993 return;
994 }
995
996 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
997
998 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
999 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1000 #if API_VERSION_NUMBER >= 11
1001 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1002 MiniDumpWithUnloadedModules);
1003 #endif
1004
1005 cwd = get_current_directory(NULL, 0);
1006 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1007 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1008
1009 if (dumpFile == INVALID_HANDLE_VALUE) {
1010 VMError::report_coredump_status("Failed to create file for dumping", false);
1011 return;
1012 }
1013 if (exceptionRecord != NULL && contextRecord != NULL) {
1014 ep.ContextRecord = (PCONTEXT) contextRecord;
1015 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1016
1017 mei.ThreadId = GetCurrentThreadId();
1018 mei.ExceptionPointers = &ep;
1019 pmei = &mei;
1020 } else {
1021 pmei = NULL;
1022 }
1023
1024
1025 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1026 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1027 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1028 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1029 DWORD error = GetLastError();
1030 LPTSTR msgbuf = NULL;
1031
1032 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1033 FORMAT_MESSAGE_FROM_SYSTEM |
1034 FORMAT_MESSAGE_IGNORE_INSERTS,
1035 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1036
1037 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1038 LocalFree(msgbuf);
1039 } else {
1040 // Call to FormatMessage failed, just include the result from GetLastError
1041 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1042 }
1043 VMError::report_coredump_status(buffer, false);
1044 } else {
1045 VMError::report_coredump_status(buffer, true);
1046 }
1047
1048 CloseHandle(dumpFile);
1049 }
1050
1051
1052
1053 void os::abort(bool dump_core)
1054 {
1055 os::shutdown();
1056 // no core dump on Windows
1057 ::exit(1);
1058 }
1059
1060 // Die immediately, no exit hook, no abort hook, no cleanup.
1061 void os::die() {
1062 _exit(-1);
1063 }
1064
1065 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1066 // * dirent_md.c 1.15 00/02/02
1067 //
1068 // The declarations for DIR and struct dirent are in jvm_win32.h.
1069
1070 /* Caller must have already run dirname through JVM_NativePath, which removes
1071 duplicate slashes and converts all instances of '/' into '\\'. */
1072
1073 DIR *
1074 os::opendir(const char *dirname)
1075 {
1076 assert(dirname != NULL, "just checking"); // hotspot change
1077 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1078 DWORD fattr; // hotspot change
1079 char alt_dirname[4] = { 0, 0, 0, 0 };
1080
1081 if (dirp == 0) {
1082 errno = ENOMEM;
1083 return 0;
1084 }
1085
1086 /*
1087 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1088 * as a directory in FindFirstFile(). We detect this case here and
1089 * prepend the current drive name.
1090 */
1091 if (dirname[1] == '\0' && dirname[0] == '\\') {
1092 alt_dirname[0] = _getdrive() + 'A' - 1;
1093 alt_dirname[1] = ':';
1094 alt_dirname[2] = '\\';
1095 alt_dirname[3] = '\0';
1096 dirname = alt_dirname;
1097 }
1098
1099 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1100 if (dirp->path == 0) {
1101 free(dirp, mtInternal);
1102 errno = ENOMEM;
1103 return 0;
1104 }
1105 strcpy(dirp->path, dirname);
1106
1107 fattr = GetFileAttributes(dirp->path);
1108 if (fattr == 0xffffffff) {
1109 free(dirp->path, mtInternal);
1110 free(dirp, mtInternal);
1111 errno = ENOENT;
1112 return 0;
1113 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1114 free(dirp->path, mtInternal);
1115 free(dirp, mtInternal);
1116 errno = ENOTDIR;
1117 return 0;
1118 }
1119
1120 /* Append "*.*", or possibly "\\*.*", to path */
1121 if (dirp->path[1] == ':'
1122 && (dirp->path[2] == '\0'
1123 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1124 /* No '\\' needed for cases like "Z:" or "Z:\" */
1125 strcat(dirp->path, "*.*");
1126 } else {
1127 strcat(dirp->path, "\\*.*");
1128 }
1129
1130 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1131 if (dirp->handle == INVALID_HANDLE_VALUE) {
1132 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1133 free(dirp->path, mtInternal);
1134 free(dirp, mtInternal);
1135 errno = EACCES;
1136 return 0;
1137 }
1138 }
1139 return dirp;
1140 }
1141
1142 /* parameter dbuf unused on Windows */
1143
1144 struct dirent *
1145 os::readdir(DIR *dirp, dirent *dbuf)
1146 {
1147 assert(dirp != NULL, "just checking"); // hotspot change
1148 if (dirp->handle == INVALID_HANDLE_VALUE) {
1149 return 0;
1150 }
1151
1152 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1153
1154 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1155 if (GetLastError() == ERROR_INVALID_HANDLE) {
1156 errno = EBADF;
1157 return 0;
1158 }
1159 FindClose(dirp->handle);
1160 dirp->handle = INVALID_HANDLE_VALUE;
1161 }
1162
1163 return &dirp->dirent;
1164 }
1165
1166 int
1167 os::closedir(DIR *dirp)
1168 {
1169 assert(dirp != NULL, "just checking"); // hotspot change
1170 if (dirp->handle != INVALID_HANDLE_VALUE) {
1171 if (!FindClose(dirp->handle)) {
1172 errno = EBADF;
1173 return -1;
1174 }
1175 dirp->handle = INVALID_HANDLE_VALUE;
1176 }
1177 free(dirp->path, mtInternal);
1178 free(dirp, mtInternal);
1179 return 0;
1180 }
1181
1182 // This must be hard coded because it's the system's temporary
1183 // directory not the java application's temp directory, ala java.io.tmpdir.
1184 const char* os::get_temp_directory() {
1185 static char path_buf[MAX_PATH];
1186 if (GetTempPath(MAX_PATH, path_buf)>0)
1187 return path_buf;
1188 else{
1189 path_buf[0]='\0';
1190 return path_buf;
1191 }
1192 }
1193
1194 static bool file_exists(const char* filename) {
1195 if (filename == NULL || strlen(filename) == 0) {
1196 return false;
1197 }
1198 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1199 }
1200
1201 bool os::dll_build_name(char *buffer, size_t buflen,
1202 const char* pname, const char* fname) {
1203 bool retval = false;
1204 const size_t pnamelen = pname ? strlen(pname) : 0;
1205 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1206
1207 // Return error on buffer overflow.
1208 if (pnamelen + strlen(fname) + 10 > buflen) {
1209 return retval;
1210 }
1211
1212 if (pnamelen == 0) {
1213 jio_snprintf(buffer, buflen, "%s.dll", fname);
1214 retval = true;
1215 } else if (c == ':' || c == '\\') {
1216 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1217 retval = true;
1218 } else if (strchr(pname, *os::path_separator()) != NULL) {
1219 int n;
1220 char** pelements = split_path(pname, &n);
1221 if (pelements == NULL) {
1222 return false;
1223 }
1224 for (int i = 0 ; i < n ; i++) {
1225 char* path = pelements[i];
1226 // Really shouldn't be NULL, but check can't hurt
1227 size_t plen = (path == NULL) ? 0 : strlen(path);
1228 if (plen == 0) {
1229 continue; // skip the empty path values
1230 }
1231 const char lastchar = path[plen - 1];
1232 if (lastchar == ':' || lastchar == '\\') {
1233 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1234 } else {
1235 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1236 }
1237 if (file_exists(buffer)) {
1238 retval = true;
1239 break;
1240 }
1241 }
1242 // release the storage
1243 for (int i = 0 ; i < n ; i++) {
1244 if (pelements[i] != NULL) {
1245 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1246 }
1247 }
1248 if (pelements != NULL) {
1249 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1250 }
1251 } else {
1252 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1253 retval = true;
1254 }
1255 return retval;
1256 }
1257
1258 // Needs to be in os specific directory because windows requires another
1259 // header file <direct.h>
1260 const char* os::get_current_directory(char *buf, size_t buflen) {
1261 int n = static_cast<int>(buflen);
1262 if (buflen > INT_MAX) n = INT_MAX;
1263 return _getcwd(buf, n);
1264 }
1265
1266 //-----------------------------------------------------------
1267 // Helper functions for fatal error handler
1268 #ifdef _WIN64
1269 // Helper routine which returns true if address in
1270 // within the NTDLL address space.
1271 //
1272 static bool _addr_in_ntdll( address addr )
1273 {
1274 HMODULE hmod;
1275 MODULEINFO minfo;
1276
1277 hmod = GetModuleHandle("NTDLL.DLL");
1278 if ( hmod == NULL ) return false;
1279 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1280 &minfo, sizeof(MODULEINFO)) )
1281 return false;
1282
1283 if ( (addr >= minfo.lpBaseOfDll) &&
1284 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1285 return true;
1286 else
1287 return false;
1288 }
1289 #endif
1290
1291
1292 // Enumerate all modules for a given process ID
1293 //
1294 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1295 // different API for doing this. We use PSAPI.DLL on NT based
1296 // Windows and ToolHelp on 95/98/Me.
1297
1298 // Callback function that is called by enumerate_modules() on
1299 // every DLL module.
1300 // Input parameters:
1301 // int pid,
1302 // char* module_file_name,
1303 // address module_base_addr,
1304 // unsigned module_size,
1305 // void* param
1306 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1307
1308 // enumerate_modules for Windows NT, using PSAPI
1309 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1310 {
1311 HANDLE hProcess ;
1312
1313 # define MAX_NUM_MODULES 128
1314 HMODULE modules[MAX_NUM_MODULES];
1315 static char filename[ MAX_PATH ];
1316 int result = 0;
1317
1318 if (!os::PSApiDll::PSApiAvailable()) {
1319 return 0;
1320 }
1321
1322 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1323 FALSE, pid ) ;
1324 if (hProcess == NULL) return 0;
1325
1326 DWORD size_needed;
1327 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1328 sizeof(modules), &size_needed)) {
1329 CloseHandle( hProcess );
1330 return 0;
1331 }
1332
1333 // number of modules that are currently loaded
1334 int num_modules = size_needed / sizeof(HMODULE);
1335
1336 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1337 // Get Full pathname:
1338 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1339 filename, sizeof(filename))) {
1340 filename[0] = '\0';
1341 }
1342
1343 MODULEINFO modinfo;
1344 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1345 &modinfo, sizeof(modinfo))) {
1346 modinfo.lpBaseOfDll = NULL;
1347 modinfo.SizeOfImage = 0;
1348 }
1349
1350 // Invoke callback function
1351 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1352 modinfo.SizeOfImage, param);
1353 if (result) break;
1354 }
1355
1356 CloseHandle( hProcess ) ;
1357 return result;
1358 }
1359
1360
1361 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1362 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1363 {
1364 HANDLE hSnapShot ;
1365 static MODULEENTRY32 modentry ;
1366 int result = 0;
1367
1368 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1369 return 0;
1370 }
1371
1372 // Get a handle to a Toolhelp snapshot of the system
1373 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1374 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1375 return FALSE ;
1376 }
1377
1378 // iterate through all modules
1379 modentry.dwSize = sizeof(MODULEENTRY32) ;
1380 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1381
1382 while( not_done ) {
1383 // invoke the callback
1384 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1385 modentry.modBaseSize, param);
1386 if (result) break;
1387
1388 modentry.dwSize = sizeof(MODULEENTRY32) ;
1389 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1390 }
1391
1392 CloseHandle(hSnapShot);
1393 return result;
1394 }
1395
1396 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1397 {
1398 // Get current process ID if caller doesn't provide it.
1399 if (!pid) pid = os::current_process_id();
1400
1401 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1402 else return _enumerate_modules_windows(pid, func, param);
1403 }
1404
1405 struct _modinfo {
1406 address addr;
1407 char* full_path; // point to a char buffer
1408 int buflen; // size of the buffer
1409 address base_addr;
1410 };
1411
1412 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1413 unsigned size, void * param) {
1414 struct _modinfo *pmod = (struct _modinfo *)param;
1415 if (!pmod) return -1;
1416
1417 if (base_addr <= pmod->addr &&
1418 base_addr+size > pmod->addr) {
1419 // if a buffer is provided, copy path name to the buffer
1420 if (pmod->full_path) {
1421 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1422 }
1423 pmod->base_addr = base_addr;
1424 return 1;
1425 }
1426 return 0;
1427 }
1428
1429 bool os::dll_address_to_library_name(address addr, char* buf,
1430 int buflen, int* offset) {
1431 // buf is not optional, but offset is optional
1432 assert(buf != NULL, "sanity check");
1433
1434 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1435 // return the full path to the DLL file, sometimes it returns path
1436 // to the corresponding PDB file (debug info); sometimes it only
1437 // returns partial path, which makes life painful.
1438
1439 struct _modinfo mi;
1440 mi.addr = addr;
1441 mi.full_path = buf;
1442 mi.buflen = buflen;
1443 int pid = os::current_process_id();
1444 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1445 // buf already contains path name
1446 if (offset) *offset = addr - mi.base_addr;
1447 return true;
1448 }
1449
1450 buf[0] = '\0';
1451 if (offset) *offset = -1;
1452 return false;
1453 }
1454
1455 bool os::dll_address_to_function_name(address addr, char *buf,
1456 int buflen, int *offset) {
1457 // buf is not optional, but offset is optional
1458 assert(buf != NULL, "sanity check");
1459
1460 if (Decoder::decode(addr, buf, buflen, offset)) {
1461 return true;
1462 }
1463 if (offset != NULL) *offset = -1;
1464 buf[0] = '\0';
1465 return false;
1466 }
1467
1468 // save the start and end address of jvm.dll into param[0] and param[1]
1469 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1470 unsigned size, void * param) {
1471 if (!param) return -1;
1472
1473 if (base_addr <= (address)_locate_jvm_dll &&
1474 base_addr+size > (address)_locate_jvm_dll) {
1475 ((address*)param)[0] = base_addr;
1476 ((address*)param)[1] = base_addr + size;
1477 return 1;
1478 }
1479 return 0;
1480 }
1481
1482 address vm_lib_location[2]; // start and end address of jvm.dll
1483
1484 // check if addr is inside jvm.dll
1485 bool os::address_is_in_vm(address addr) {
1486 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1487 int pid = os::current_process_id();
1488 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1489 assert(false, "Can't find jvm module.");
1490 return false;
1491 }
1492 }
1493
1494 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1495 }
1496
1497 // print module info; param is outputStream*
1498 static int _print_module(int pid, char* fname, address base,
1499 unsigned size, void* param) {
1500 if (!param) return -1;
1501
1502 outputStream* st = (outputStream*)param;
1503
1504 address end_addr = base + size;
1505 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1506 return 0;
1507 }
1508
1509 // Loads .dll/.so and
1510 // in case of error it checks if .dll/.so was built for the
1511 // same architecture as Hotspot is running on
1512 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1513 {
1514 void * result = LoadLibrary(name);
1515 if (result != NULL)
1516 {
1517 return result;
1518 }
1519
1520 DWORD errcode = GetLastError();
1521 if (errcode == ERROR_MOD_NOT_FOUND) {
1522 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1523 ebuf[ebuflen-1]='\0';
1524 return NULL;
1525 }
1526
1527 // Parsing dll below
1528 // If we can read dll-info and find that dll was built
1529 // for an architecture other than Hotspot is running in
1530 // - then print to buffer "DLL was built for a different architecture"
1531 // else call os::lasterror to obtain system error message
1532
1533 // Read system error message into ebuf
1534 // It may or may not be overwritten below (in the for loop and just above)
1535 lasterror(ebuf, (size_t) ebuflen);
1536 ebuf[ebuflen-1]='\0';
1537 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1538 if (file_descriptor<0)
1539 {
1540 return NULL;
1541 }
1542
1543 uint32_t signature_offset;
1544 uint16_t lib_arch=0;
1545 bool failed_to_get_lib_arch=
1546 (
1547 //Go to position 3c in the dll
1548 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1549 ||
1550 // Read loacation of signature
1551 (sizeof(signature_offset)!=
1552 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1553 ||
1554 //Go to COFF File Header in dll
1555 //that is located after"signature" (4 bytes long)
1556 (os::seek_to_file_offset(file_descriptor,
1557 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1558 ||
1559 //Read field that contains code of architecture
1560 // that dll was build for
1561 (sizeof(lib_arch)!=
1562 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1563 );
1564
1565 ::close(file_descriptor);
1566 if (failed_to_get_lib_arch)
1567 {
1568 // file i/o error - report os::lasterror(...) msg
1569 return NULL;
1570 }
1571
1572 typedef struct
1573 {
1574 uint16_t arch_code;
1575 char* arch_name;
1576 } arch_t;
1577
1578 static const arch_t arch_array[]={
1579 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1580 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1581 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1582 };
1583 #if (defined _M_IA64)
1584 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1585 #elif (defined _M_AMD64)
1586 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1587 #elif (defined _M_IX86)
1588 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1589 #else
1590 #error Method os::dll_load requires that one of following \
1591 is defined :_M_IA64,_M_AMD64 or _M_IX86
1592 #endif
1593
1594
1595 // Obtain a string for printf operation
1596 // lib_arch_str shall contain string what platform this .dll was built for
1597 // running_arch_str shall string contain what platform Hotspot was built for
1598 char *running_arch_str=NULL,*lib_arch_str=NULL;
1599 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1600 {
1601 if (lib_arch==arch_array[i].arch_code)
1602 lib_arch_str=arch_array[i].arch_name;
1603 if (running_arch==arch_array[i].arch_code)
1604 running_arch_str=arch_array[i].arch_name;
1605 }
1606
1607 assert(running_arch_str,
1608 "Didn't find runing architecture code in arch_array");
1609
1610 // If the architure is right
1611 // but some other error took place - report os::lasterror(...) msg
1612 if (lib_arch == running_arch)
1613 {
1614 return NULL;
1615 }
1616
1617 if (lib_arch_str!=NULL)
1618 {
1619 ::_snprintf(ebuf, ebuflen-1,
1620 "Can't load %s-bit .dll on a %s-bit platform",
1621 lib_arch_str,running_arch_str);
1622 }
1623 else
1624 {
1625 // don't know what architecture this dll was build for
1626 ::_snprintf(ebuf, ebuflen-1,
1627 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1628 lib_arch,running_arch_str);
1629 }
1630
1631 return NULL;
1632 }
1633
1634
1635 void os::print_dll_info(outputStream *st) {
1636 int pid = os::current_process_id();
1637 st->print_cr("Dynamic libraries:");
1638 enumerate_modules(pid, _print_module, (void *)st);
1639 }
1640
1641 void os::print_os_info_brief(outputStream* st) {
1642 os::print_os_info(st);
1643 }
1644
1645 void os::print_os_info(outputStream* st) {
1646 st->print("OS:");
1647
1648 os::win32::print_windows_version(st);
1649 }
1650
1651 void os::win32::print_windows_version(outputStream* st) {
1652 OSVERSIONINFOEX osvi;
1653 VS_FIXEDFILEINFO *file_info;
1654 TCHAR kernel32_path[MAX_PATH];
1655 UINT len, ret;
1656
1657 // Use the GetVersionEx information to see if we're on a server or
1658 // workstation edition of Windows. Starting with Windows 8.1 we can't
1659 // trust the OS version information returned by this API.
1660 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1661 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1662 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1663 st->print_cr("Call to GetVersionEx failed");
1664 return;
1665 }
1666 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1667
1668 // Get the full path to \Windows\System32\kernel32.dll and use that for
1669 // determining what version of Windows we're running on.
1670 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1671 ret = GetSystemDirectory(kernel32_path, len);
1672 if (ret == 0 || ret > len) {
1673 st->print_cr("Call to GetSystemDirectory failed");
1674 return;
1675 }
1676 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1677
1678 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1679 if (version_size == 0) {
1680 st->print_cr("Call to GetFileVersionInfoSize failed");
1681 return;
1682 }
1683
1684 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1685 if (version_info == NULL) {
1686 st->print_cr("Failed to allocate version_info");
1687 return;
1688 }
1689
1690 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1691 os::free(version_info);
1692 st->print_cr("Call to GetFileVersionInfo failed");
1693 return;
1694 }
1695
1696 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1697 os::free(version_info);
1698 st->print_cr("Call to VerQueryValue failed");
1699 return;
1700 }
1701
1702 int major_version = HIWORD(file_info->dwProductVersionMS);
1703 int minor_version = LOWORD(file_info->dwProductVersionMS);
1704 int build_number = HIWORD(file_info->dwProductVersionLS);
1705 int build_minor = LOWORD(file_info->dwProductVersionLS);
1706 int os_vers = major_version * 1000 + minor_version;
1707 os::free(version_info);
1708
1709 st->print(" Windows ");
1710 switch (os_vers) {
1711
1712 case 6000:
1713 if (is_workstation) {
1714 st->print("Vista");
1715 } else {
1716 st->print("Server 2008");
1717 }
1718 break;
1719
1720 case 6001:
1721 if (is_workstation) {
1722 st->print("7");
1723 } else {
1724 st->print("Server 2008 R2");
1725 }
1726 break;
1727
1728 case 6002:
1729 if (is_workstation) {
1730 st->print("8");
1731 } else {
1732 st->print("Server 2012");
1733 }
1734 break;
1735
1736 case 6003:
1737 if (is_workstation) {
1738 st->print("8.1");
1739 } else {
1740 st->print("Server 2012 R2");
1741 }
1742 break;
1743
1744 case 6004:
1745 if (is_workstation) {
1746 st->print("10");
1747 } else {
1748 // The server version name of Windows 10 is not known at this time
1749 st->print("%d.%d", major_version, minor_version);
1750 }
1751 break;
1752
1753 default:
1754 // Unrecognized windows, print out its major and minor versions
1755 st->print("%d.%d", major_version, minor_version);
1756 break;
1757 }
1758
1759 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1760 // find out whether we are running on 64 bit processor or not
1761 SYSTEM_INFO si;
1762 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1763 os::Kernel32Dll::GetNativeSystemInfo(&si);
1764 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1765 st->print(" , 64 bit");
1766 }
1767
1768 st->print(" Build %d", build_number);
1769 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1770 st->cr();
1771 }
1772
1773 void os::pd_print_cpu_info(outputStream* st) {
1774 // Nothing to do for now.
1775 }
1776
1777 void os::print_memory_info(outputStream* st) {
1778 st->print("Memory:");
1779 st->print(" %dk page", os::vm_page_size()>>10);
1780
1781 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1782 // value if total memory is larger than 4GB
1783 MEMORYSTATUSEX ms;
1784 ms.dwLength = sizeof(ms);
1785 GlobalMemoryStatusEx(&ms);
1786
1787 st->print(", physical %uk", os::physical_memory() >> 10);
1788 st->print("(%uk free)", os::available_memory() >> 10);
1789
1790 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1791 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1792 st->cr();
1793 }
1794
1795 void os::print_siginfo(outputStream *st, void *siginfo) {
1796 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1797 st->print("siginfo:");
1798 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1799
1800 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1801 er->NumberParameters >= 2) {
1802 switch (er->ExceptionInformation[0]) {
1803 case 0: st->print(", reading address"); break;
1804 case 1: st->print(", writing address"); break;
1805 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1806 er->ExceptionInformation[0]);
1807 }
1808 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1809 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1810 er->NumberParameters >= 2 && UseSharedSpaces) {
1811 FileMapInfo* mapinfo = FileMapInfo::current_info();
1812 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1813 st->print("\n\nError accessing class data sharing archive." \
1814 " Mapped file inaccessible during execution, " \
1815 " possible disk/network problem.");
1816 }
1817 } else {
1818 int num = er->NumberParameters;
1819 if (num > 0) {
1820 st->print(", ExceptionInformation=");
1821 for (int i = 0; i < num; i++) {
1822 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1823 }
1824 }
1825 }
1826 st->cr();
1827 }
1828
1829 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1830 // do nothing
1831 }
1832
1833 static char saved_jvm_path[MAX_PATH] = {0};
1834
1835 // Find the full path to the current module, jvm.dll
1836 void os::jvm_path(char *buf, jint buflen) {
1837 // Error checking.
1838 if (buflen < MAX_PATH) {
1839 assert(false, "must use a large-enough buffer");
1840 buf[0] = '\0';
1841 return;
1842 }
1843 // Lazy resolve the path to current module.
1844 if (saved_jvm_path[0] != 0) {
1845 strcpy(buf, saved_jvm_path);
1846 return;
1847 }
1848
1849 buf[0] = '\0';
1850 if (Arguments::created_by_gamma_launcher()) {
1851 // Support for the gamma launcher. Check for an
1852 // JAVA_HOME environment variable
1853 // and fix up the path so it looks like
1854 // libjvm.so is installed there (append a fake suffix
1855 // hotspot/libjvm.so).
1856 char* java_home_var = ::getenv("JAVA_HOME");
1857 if (java_home_var != NULL && java_home_var[0] != 0 &&
1858 strlen(java_home_var) < (size_t)buflen) {
1859
1860 strncpy(buf, java_home_var, buflen);
1861
1862 // determine if this is a legacy image or modules image
1863 // modules image doesn't have "jre" subdirectory
1864 size_t len = strlen(buf);
1865 char* jrebin_p = buf + len;
1866 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1867 if (0 != _access(buf, 0)) {
1868 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1869 }
1870 len = strlen(buf);
1871 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1872 }
1873 }
1874
1875 if(buf[0] == '\0') {
1876 GetModuleFileName(vm_lib_handle, buf, buflen);
1877 }
1878 strncpy(saved_jvm_path, buf, MAX_PATH);
1879 }
1880
1881
1882 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1883 #ifndef _WIN64
1884 st->print("_");
1885 #endif
1886 }
1887
1888
1889 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1890 #ifndef _WIN64
1891 st->print("@%d", args_size * sizeof(int));
1892 #endif
1893 }
1894
1895 // This method is a copy of JDK's sysGetLastErrorString
1896 // from src/windows/hpi/src/system_md.c
1897
1898 size_t os::lasterror(char* buf, size_t len) {
1899 DWORD errval;
1900
1901 if ((errval = GetLastError()) != 0) {
1902 // DOS error
1903 size_t n = (size_t)FormatMessage(
1904 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1905 NULL,
1906 errval,
1907 0,
1908 buf,
1909 (DWORD)len,
1910 NULL);
1911 if (n > 3) {
1912 // Drop final '.', CR, LF
1913 if (buf[n - 1] == '\n') n--;
1914 if (buf[n - 1] == '\r') n--;
1915 if (buf[n - 1] == '.') n--;
1916 buf[n] = '\0';
1917 }
1918 return n;
1919 }
1920
1921 if (errno != 0) {
1922 // C runtime error that has no corresponding DOS error code
1923 const char* s = strerror(errno);
1924 size_t n = strlen(s);
1925 if (n >= len) n = len - 1;
1926 strncpy(buf, s, n);
1927 buf[n] = '\0';
1928 return n;
1929 }
1930
1931 return 0;
1932 }
1933
1934 int os::get_last_error() {
1935 DWORD error = GetLastError();
1936 if (error == 0)
1937 error = errno;
1938 return (int)error;
1939 }
1940
1941 // sun.misc.Signal
1942 // NOTE that this is a workaround for an apparent kernel bug where if
1943 // a signal handler for SIGBREAK is installed then that signal handler
1944 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1945 // See bug 4416763.
1946 static void (*sigbreakHandler)(int) = NULL;
1947
1948 static void UserHandler(int sig, void *siginfo, void *context) {
1949 os::signal_notify(sig);
1950 // We need to reinstate the signal handler each time...
1951 os::signal(sig, (void*)UserHandler);
1952 }
1953
1954 void* os::user_handler() {
1955 return (void*) UserHandler;
1956 }
1957
1958 void* os::signal(int signal_number, void* handler) {
1959 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1960 void (*oldHandler)(int) = sigbreakHandler;
1961 sigbreakHandler = (void (*)(int)) handler;
1962 return (void*) oldHandler;
1963 } else {
1964 return (void*)::signal(signal_number, (void (*)(int))handler);
1965 }
1966 }
1967
1968 void os::signal_raise(int signal_number) {
1969 raise(signal_number);
1970 }
1971
1972 // The Win32 C runtime library maps all console control events other than ^C
1973 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1974 // logoff, and shutdown events. We therefore install our own console handler
1975 // that raises SIGTERM for the latter cases.
1976 //
1977 static BOOL WINAPI consoleHandler(DWORD event) {
1978 switch(event) {
1979 case CTRL_C_EVENT:
1980 if (is_error_reported()) {
1981 // Ctrl-C is pressed during error reporting, likely because the error
1982 // handler fails to abort. Let VM die immediately.
1983 os::die();
1984 }
1985
1986 os::signal_raise(SIGINT);
1987 return TRUE;
1988 break;
1989 case CTRL_BREAK_EVENT:
1990 if (sigbreakHandler != NULL) {
1991 (*sigbreakHandler)(SIGBREAK);
1992 }
1993 return TRUE;
1994 break;
1995 case CTRL_LOGOFF_EVENT: {
1996 // Don't terminate JVM if it is running in a non-interactive session,
1997 // such as a service process.
1998 USEROBJECTFLAGS flags;
1999 HANDLE handle = GetProcessWindowStation();
2000 if (handle != NULL &&
2001 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2002 sizeof( USEROBJECTFLAGS), NULL)) {
2003 // If it is a non-interactive session, let next handler to deal
2004 // with it.
2005 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2006 return FALSE;
2007 }
2008 }
2009 }
2010 case CTRL_CLOSE_EVENT:
2011 case CTRL_SHUTDOWN_EVENT:
2012 os::signal_raise(SIGTERM);
2013 return TRUE;
2014 break;
2015 default:
2016 break;
2017 }
2018 return FALSE;
2019 }
2020
2021 /*
2022 * The following code is moved from os.cpp for making this
2023 * code platform specific, which it is by its very nature.
2024 */
2025
2026 // Return maximum OS signal used + 1 for internal use only
2027 // Used as exit signal for signal_thread
2028 int os::sigexitnum_pd(){
2029 return NSIG;
2030 }
2031
2032 // a counter for each possible signal value, including signal_thread exit signal
2033 static volatile jint pending_signals[NSIG+1] = { 0 };
2034 static HANDLE sig_sem = NULL;
2035
2036 void os::signal_init_pd() {
2037 // Initialize signal structures
2038 memset((void*)pending_signals, 0, sizeof(pending_signals));
2039
2040 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2041
2042 // Programs embedding the VM do not want it to attempt to receive
2043 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2044 // shutdown hooks mechanism introduced in 1.3. For example, when
2045 // the VM is run as part of a Windows NT service (i.e., a servlet
2046 // engine in a web server), the correct behavior is for any console
2047 // control handler to return FALSE, not TRUE, because the OS's
2048 // "final" handler for such events allows the process to continue if
2049 // it is a service (while terminating it if it is not a service).
2050 // To make this behavior uniform and the mechanism simpler, we
2051 // completely disable the VM's usage of these console events if -Xrs
2052 // (=ReduceSignalUsage) is specified. This means, for example, that
2053 // the CTRL-BREAK thread dump mechanism is also disabled in this
2054 // case. See bugs 4323062, 4345157, and related bugs.
2055
2056 if (!ReduceSignalUsage) {
2057 // Add a CTRL-C handler
2058 SetConsoleCtrlHandler(consoleHandler, TRUE);
2059 }
2060 }
2061
2062 void os::signal_notify(int signal_number) {
2063 BOOL ret;
2064 if (sig_sem != NULL) {
2065 Atomic::inc(&pending_signals[signal_number]);
2066 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2067 assert(ret != 0, "ReleaseSemaphore() failed");
2068 }
2069 }
2070
2071 static int check_pending_signals(bool wait_for_signal) {
2072 DWORD ret;
2073 while (true) {
2074 for (int i = 0; i < NSIG + 1; i++) {
2075 jint n = pending_signals[i];
2076 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2077 return i;
2078 }
2079 }
2080 if (!wait_for_signal) {
2081 return -1;
2082 }
2083
2084 JavaThread *thread = JavaThread::current();
2085
2086 ThreadBlockInVM tbivm(thread);
2087
2088 bool threadIsSuspended;
2089 do {
2090 thread->set_suspend_equivalent();
2091 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2092 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2093 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2094
2095 // were we externally suspended while we were waiting?
2096 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2097 if (threadIsSuspended) {
2098 //
2099 // The semaphore has been incremented, but while we were waiting
2100 // another thread suspended us. We don't want to continue running
2101 // while suspended because that would surprise the thread that
2102 // suspended us.
2103 //
2104 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2105 assert(ret != 0, "ReleaseSemaphore() failed");
2106
2107 thread->java_suspend_self();
2108 }
2109 } while (threadIsSuspended);
2110 }
2111 }
2112
2113 int os::signal_lookup() {
2114 return check_pending_signals(false);
2115 }
2116
2117 int os::signal_wait() {
2118 return check_pending_signals(true);
2119 }
2120
2121 // Implicit OS exception handling
2122
2123 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2124 JavaThread* thread = JavaThread::current();
2125 // Save pc in thread
2126 #ifdef _M_IA64
2127 // Do not blow up if no thread info available.
2128 if (thread) {
2129 // Saving PRECISE pc (with slot information) in thread.
2130 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2131 // Convert precise PC into "Unix" format
2132 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2133 thread->set_saved_exception_pc((address)precise_pc);
2134 }
2135 // Set pc to handler
2136 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2137 // Clear out psr.ri (= Restart Instruction) in order to continue
2138 // at the beginning of the target bundle.
2139 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2140 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2141 #elif _M_AMD64
2142 // Do not blow up if no thread info available.
2143 if (thread) {
2144 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2145 }
2146 // Set pc to handler
2147 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2148 #else
2149 // Do not blow up if no thread info available.
2150 if (thread) {
2151 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2152 }
2153 // Set pc to handler
2154 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2155 #endif
2156
2157 // Continue the execution
2158 return EXCEPTION_CONTINUE_EXECUTION;
2159 }
2160
2161
2162 // Used for PostMortemDump
2163 extern "C" void safepoints();
2164 extern "C" void find(int x);
2165 extern "C" void events();
2166
2167 // According to Windows API documentation, an illegal instruction sequence should generate
2168 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2169 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2170 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2171
2172 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2173
2174 // From "Execution Protection in the Windows Operating System" draft 0.35
2175 // Once a system header becomes available, the "real" define should be
2176 // included or copied here.
2177 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2178
2179 // Handle NAT Bit consumption on IA64.
2180 #ifdef _M_IA64
2181 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2182 #endif
2183
2184 // Windows Vista/2008 heap corruption check
2185 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2186
2187 #define def_excpt(val) #val, val
2188
2189 struct siglabel {
2190 char *name;
2191 int number;
2192 };
2193
2194 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2195 // C++ compiler contain this error code. Because this is a compiler-generated
2196 // error, the code is not listed in the Win32 API header files.
2197 // The code is actually a cryptic mnemonic device, with the initial "E"
2198 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2199 // ASCII values of "msc".
2200
2201 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2202
2203
2204 struct siglabel exceptlabels[] = {
2205 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2206 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2207 def_excpt(EXCEPTION_BREAKPOINT),
2208 def_excpt(EXCEPTION_SINGLE_STEP),
2209 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2210 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2211 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2212 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2213 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2214 def_excpt(EXCEPTION_FLT_OVERFLOW),
2215 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2216 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2217 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2218 def_excpt(EXCEPTION_INT_OVERFLOW),
2219 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2220 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2221 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2222 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2223 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2224 def_excpt(EXCEPTION_STACK_OVERFLOW),
2225 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2226 def_excpt(EXCEPTION_GUARD_PAGE),
2227 def_excpt(EXCEPTION_INVALID_HANDLE),
2228 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2229 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2230 #ifdef _M_IA64
2231 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2232 #endif
2233 NULL, 0
2234 };
2235
2236 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2237 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2238 if (exceptlabels[i].number == exception_code) {
2239 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2240 return buf;
2241 }
2242 }
2243
2244 return NULL;
2245 }
2246
2247 //-----------------------------------------------------------------------------
2248 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2249 // handle exception caused by idiv; should only happen for -MinInt/-1
2250 // (division by zero is handled explicitly)
2251 #ifdef _M_IA64
2252 assert(0, "Fix Handle_IDiv_Exception");
2253 #elif _M_AMD64
2254 PCONTEXT ctx = exceptionInfo->ContextRecord;
2255 address pc = (address)ctx->Rip;
2256 assert(pc[0] == 0xF7, "not an idiv opcode");
2257 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2258 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2259 // set correct result values and continue after idiv instruction
2260 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2261 ctx->Rax = (DWORD)min_jint; // result
2262 ctx->Rdx = (DWORD)0; // remainder
2263 // Continue the execution
2264 #else
2265 PCONTEXT ctx = exceptionInfo->ContextRecord;
2266 address pc = (address)ctx->Eip;
2267 assert(pc[0] == 0xF7, "not an idiv opcode");
2268 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2269 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2270 // set correct result values and continue after idiv instruction
2271 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2272 ctx->Eax = (DWORD)min_jint; // result
2273 ctx->Edx = (DWORD)0; // remainder
2274 // Continue the execution
2275 #endif
2276 return EXCEPTION_CONTINUE_EXECUTION;
2277 }
2278
2279 #ifndef _WIN64
2280 //-----------------------------------------------------------------------------
2281 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2282 // handle exception caused by native method modifying control word
2283 PCONTEXT ctx = exceptionInfo->ContextRecord;
2284 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2285
2286 switch (exception_code) {
2287 case EXCEPTION_FLT_DENORMAL_OPERAND:
2288 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2289 case EXCEPTION_FLT_INEXACT_RESULT:
2290 case EXCEPTION_FLT_INVALID_OPERATION:
2291 case EXCEPTION_FLT_OVERFLOW:
2292 case EXCEPTION_FLT_STACK_CHECK:
2293 case EXCEPTION_FLT_UNDERFLOW:
2294 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2295 if (fp_control_word != ctx->FloatSave.ControlWord) {
2296 // Restore FPCW and mask out FLT exceptions
2297 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2298 // Mask out pending FLT exceptions
2299 ctx->FloatSave.StatusWord &= 0xffffff00;
2300 return EXCEPTION_CONTINUE_EXECUTION;
2301 }
2302 }
2303
2304 if (prev_uef_handler != NULL) {
2305 // We didn't handle this exception so pass it to the previous
2306 // UnhandledExceptionFilter.
2307 return (prev_uef_handler)(exceptionInfo);
2308 }
2309
2310 return EXCEPTION_CONTINUE_SEARCH;
2311 }
2312 #else //_WIN64
2313 /*
2314 On Windows, the mxcsr control bits are non-volatile across calls
2315 See also CR 6192333
2316 If EXCEPTION_FLT_* happened after some native method modified
2317 mxcsr - it is not a jvm fault.
2318 However should we decide to restore of mxcsr after a faulty
2319 native method we can uncomment following code
2320 jint MxCsr = INITIAL_MXCSR;
2321 // we can't use StubRoutines::addr_mxcsr_std()
2322 // because in Win64 mxcsr is not saved there
2323 if (MxCsr != ctx->MxCsr) {
2324 ctx->MxCsr = MxCsr;
2325 return EXCEPTION_CONTINUE_EXECUTION;
2326 }
2327
2328 */
2329 #endif // _WIN64
2330
2331
2332 static inline void report_error(Thread* t, DWORD exception_code,
2333 address addr, void* siginfo, void* context) {
2334 VMError err(t, exception_code, addr, siginfo, context);
2335 err.report_and_die();
2336
2337 // If UseOsErrorReporting, this will return here and save the error file
2338 // somewhere where we can find it in the minidump.
2339 }
2340
2341 //-----------------------------------------------------------------------------
2342 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2343 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2344 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2345 #ifdef _M_IA64
2346 // On Itanium, we need the "precise pc", which has the slot number coded
2347 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2348 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2349 // Convert the pc to "Unix format", which has the slot number coded
2350 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2351 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2352 // information is saved in the Unix format.
2353 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2354 #elif _M_AMD64
2355 address pc = (address) exceptionInfo->ContextRecord->Rip;
2356 #else
2357 address pc = (address) exceptionInfo->ContextRecord->Eip;
2358 #endif
2359 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2360
2361 // Handle SafeFetch32 and SafeFetchN exceptions.
2362 if (StubRoutines::is_safefetch_fault(pc)) {
2363 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2364 }
2365
2366 #ifndef _WIN64
2367 // Execution protection violation - win32 running on AMD64 only
2368 // Handled first to avoid misdiagnosis as a "normal" access violation;
2369 // This is safe to do because we have a new/unique ExceptionInformation
2370 // code for this condition.
2371 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2372 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2373 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2374 address addr = (address) exceptionRecord->ExceptionInformation[1];
2375
2376 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2377 int page_size = os::vm_page_size();
2378
2379 // Make sure the pc and the faulting address are sane.
2380 //
2381 // If an instruction spans a page boundary, and the page containing
2382 // the beginning of the instruction is executable but the following
2383 // page is not, the pc and the faulting address might be slightly
2384 // different - we still want to unguard the 2nd page in this case.
2385 //
2386 // 15 bytes seems to be a (very) safe value for max instruction size.
2387 bool pc_is_near_addr =
2388 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2389 bool instr_spans_page_boundary =
2390 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2391 (intptr_t) page_size) > 0);
2392
2393 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2394 static volatile address last_addr =
2395 (address) os::non_memory_address_word();
2396
2397 // In conservative mode, don't unguard unless the address is in the VM
2398 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2399 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2400
2401 // Set memory to RWX and retry
2402 address page_start =
2403 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2404 bool res = os::protect_memory((char*) page_start, page_size,
2405 os::MEM_PROT_RWX);
2406
2407 if (PrintMiscellaneous && Verbose) {
2408 char buf[256];
2409 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2410 "at " INTPTR_FORMAT
2411 ", unguarding " INTPTR_FORMAT ": %s", addr,
2412 page_start, (res ? "success" : strerror(errno)));
2413 tty->print_raw_cr(buf);
2414 }
2415
2416 // Set last_addr so if we fault again at the same address, we don't
2417 // end up in an endless loop.
2418 //
2419 // There are two potential complications here. Two threads trapping
2420 // at the same address at the same time could cause one of the
2421 // threads to think it already unguarded, and abort the VM. Likely
2422 // very rare.
2423 //
2424 // The other race involves two threads alternately trapping at
2425 // different addresses and failing to unguard the page, resulting in
2426 // an endless loop. This condition is probably even more unlikely
2427 // than the first.
2428 //
2429 // Although both cases could be avoided by using locks or thread
2430 // local last_addr, these solutions are unnecessary complication:
2431 // this handler is a best-effort safety net, not a complete solution.
2432 // It is disabled by default and should only be used as a workaround
2433 // in case we missed any no-execute-unsafe VM code.
2434
2435 last_addr = addr;
2436
2437 return EXCEPTION_CONTINUE_EXECUTION;
2438 }
2439 }
2440
2441 // Last unguard failed or not unguarding
2442 tty->print_raw_cr("Execution protection violation");
2443 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2444 exceptionInfo->ContextRecord);
2445 return EXCEPTION_CONTINUE_SEARCH;
2446 }
2447 }
2448 #endif // _WIN64
2449
2450 // Check to see if we caught the safepoint code in the
2451 // process of write protecting the memory serialization page.
2452 // It write enables the page immediately after protecting it
2453 // so just return.
2454 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2455 JavaThread* thread = (JavaThread*) t;
2456 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2457 address addr = (address) exceptionRecord->ExceptionInformation[1];
2458 if ( os::is_memory_serialize_page(thread, addr) ) {
2459 // Block current thread until the memory serialize page permission restored.
2460 os::block_on_serialize_page_trap();
2461 return EXCEPTION_CONTINUE_EXECUTION;
2462 }
2463 }
2464
2465 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2466 VM_Version::is_cpuinfo_segv_addr(pc)) {
2467 // Verify that OS save/restore AVX registers.
2468 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2469 }
2470
2471 if (t != NULL && t->is_Java_thread()) {
2472 JavaThread* thread = (JavaThread*) t;
2473 bool in_java = thread->thread_state() == _thread_in_Java;
2474
2475 // Handle potential stack overflows up front.
2476 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2477 if (os::uses_stack_guard_pages()) {
2478 #ifdef _M_IA64
2479 // Use guard page for register stack.
2480 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2481 address addr = (address) exceptionRecord->ExceptionInformation[1];
2482 // Check for a register stack overflow on Itanium
2483 if (thread->addr_inside_register_stack_red_zone(addr)) {
2484 // Fatal red zone violation happens if the Java program
2485 // catches a StackOverflow error and does so much processing
2486 // that it runs beyond the unprotected yellow guard zone. As
2487 // a result, we are out of here.
2488 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2489 } else if(thread->addr_inside_register_stack(addr)) {
2490 // Disable the yellow zone which sets the state that
2491 // we've got a stack overflow problem.
2492 if (thread->stack_yellow_zone_enabled()) {
2493 thread->disable_stack_yellow_zone();
2494 }
2495 // Give us some room to process the exception.
2496 thread->disable_register_stack_guard();
2497 // Tracing with +Verbose.
2498 if (Verbose) {
2499 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2500 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2501 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2502 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2503 thread->register_stack_base(),
2504 thread->register_stack_base() + thread->stack_size());
2505 }
2506
2507 // Reguard the permanent register stack red zone just to be sure.
2508 // We saw Windows silently disabling this without telling us.
2509 thread->enable_register_stack_red_zone();
2510
2511 return Handle_Exception(exceptionInfo,
2512 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2513 }
2514 #endif
2515 if (thread->stack_yellow_zone_enabled()) {
2516 // Yellow zone violation. The o/s has unprotected the first yellow
2517 // zone page for us. Note: must call disable_stack_yellow_zone to
2518 // update the enabled status, even if the zone contains only one page.
2519 thread->disable_stack_yellow_zone();
2520 // If not in java code, return and hope for the best.
2521 return in_java ? Handle_Exception(exceptionInfo,
2522 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2523 : EXCEPTION_CONTINUE_EXECUTION;
2524 } else {
2525 // Fatal red zone violation.
2526 thread->disable_stack_red_zone();
2527 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2528 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2529 exceptionInfo->ContextRecord);
2530 return EXCEPTION_CONTINUE_SEARCH;
2531 }
2532 } else if (in_java) {
2533 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2534 // a one-time-only guard page, which it has released to us. The next
2535 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2536 return Handle_Exception(exceptionInfo,
2537 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2538 } else {
2539 // Can only return and hope for the best. Further stack growth will
2540 // result in an ACCESS_VIOLATION.
2541 return EXCEPTION_CONTINUE_EXECUTION;
2542 }
2543 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2544 // Either stack overflow or null pointer exception.
2545 if (in_java) {
2546 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2547 address addr = (address) exceptionRecord->ExceptionInformation[1];
2548 address stack_end = thread->stack_base() - thread->stack_size();
2549 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2550 // Stack overflow.
2551 assert(!os::uses_stack_guard_pages(),
2552 "should be caught by red zone code above.");
2553 return Handle_Exception(exceptionInfo,
2554 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2555 }
2556 //
2557 // Check for safepoint polling and implicit null
2558 // We only expect null pointers in the stubs (vtable)
2559 // the rest are checked explicitly now.
2560 //
2561 CodeBlob* cb = CodeCache::find_blob(pc);
2562 if (cb != NULL) {
2563 if (os::is_poll_address(addr)) {
2564 address stub = SharedRuntime::get_poll_stub(pc);
2565 return Handle_Exception(exceptionInfo, stub);
2566 }
2567 }
2568 {
2569 #ifdef _WIN64
2570 //
2571 // If it's a legal stack address map the entire region in
2572 //
2573 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2574 address addr = (address) exceptionRecord->ExceptionInformation[1];
2575 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2576 addr = (address)((uintptr_t)addr &
2577 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2578 os::commit_memory((char *)addr, thread->stack_base() - addr,
2579 !ExecMem);
2580 return EXCEPTION_CONTINUE_EXECUTION;
2581 }
2582 else
2583 #endif
2584 {
2585 // Null pointer exception.
2586 #ifdef _M_IA64
2587 // Process implicit null checks in compiled code. Note: Implicit null checks
2588 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2589 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2590 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2591 // Handle implicit null check in UEP method entry
2592 if (cb && (cb->is_frame_complete_at(pc) ||
2593 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2594 if (Verbose) {
2595 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2596 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2597 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2598 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2599 *(bundle_start + 1), *bundle_start);
2600 }
2601 return Handle_Exception(exceptionInfo,
2602 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2603 }
2604 }
2605
2606 // Implicit null checks were processed above. Hence, we should not reach
2607 // here in the usual case => die!
2608 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2609 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2610 exceptionInfo->ContextRecord);
2611 return EXCEPTION_CONTINUE_SEARCH;
2612
2613 #else // !IA64
2614
2615 // Windows 98 reports faulting addresses incorrectly
2616 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2617 !os::win32::is_nt()) {
2618 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2619 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2620 }
2621 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2622 exceptionInfo->ContextRecord);
2623 return EXCEPTION_CONTINUE_SEARCH;
2624 #endif
2625 }
2626 }
2627 }
2628
2629 #ifdef _WIN64
2630 // Special care for fast JNI field accessors.
2631 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2632 // in and the heap gets shrunk before the field access.
2633 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2634 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2635 if (addr != (address)-1) {
2636 return Handle_Exception(exceptionInfo, addr);
2637 }
2638 }
2639 #endif
2640
2641 // Stack overflow or null pointer exception in native code.
2642 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2643 exceptionInfo->ContextRecord);
2644 return EXCEPTION_CONTINUE_SEARCH;
2645 } // /EXCEPTION_ACCESS_VIOLATION
2646 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2647 #if defined _M_IA64
2648 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2649 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2650 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2651
2652 // Compiled method patched to be non entrant? Following conditions must apply:
2653 // 1. must be first instruction in bundle
2654 // 2. must be a break instruction with appropriate code
2655 if((((uint64_t) pc & 0x0F) == 0) &&
2656 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2657 return Handle_Exception(exceptionInfo,
2658 (address)SharedRuntime::get_handle_wrong_method_stub());
2659 }
2660 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2661 #endif
2662
2663
2664 if (in_java) {
2665 switch (exception_code) {
2666 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2667 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2668
2669 case EXCEPTION_INT_OVERFLOW:
2670 return Handle_IDiv_Exception(exceptionInfo);
2671
2672 } // switch
2673 }
2674 #ifndef _WIN64
2675 if (((thread->thread_state() == _thread_in_Java) ||
2676 (thread->thread_state() == _thread_in_native)) &&
2677 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2678 {
2679 LONG result=Handle_FLT_Exception(exceptionInfo);
2680 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2681 }
2682 #endif //_WIN64
2683 }
2684
2685 if (exception_code != EXCEPTION_BREAKPOINT) {
2686 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2687 exceptionInfo->ContextRecord);
2688 }
2689 return EXCEPTION_CONTINUE_SEARCH;
2690 }
2691
2692 #ifndef _WIN64
2693 // Special care for fast JNI accessors.
2694 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2695 // the heap gets shrunk before the field access.
2696 // Need to install our own structured exception handler since native code may
2697 // install its own.
2698 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2699 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2700 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2701 address pc = (address) exceptionInfo->ContextRecord->Eip;
2702 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2703 if (addr != (address)-1) {
2704 return Handle_Exception(exceptionInfo, addr);
2705 }
2706 }
2707 return EXCEPTION_CONTINUE_SEARCH;
2708 }
2709
2710 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2711 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2712 __try { \
2713 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2714 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2715 } \
2716 return 0; \
2717 }
2718
2719 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2720 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2721 DEFINE_FAST_GETFIELD(jchar, char, Char)
2722 DEFINE_FAST_GETFIELD(jshort, short, Short)
2723 DEFINE_FAST_GETFIELD(jint, int, Int)
2724 DEFINE_FAST_GETFIELD(jlong, long, Long)
2725 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2726 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2727
2728 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2729 switch (type) {
2730 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2731 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2732 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2733 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2734 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2735 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2736 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2737 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2738 default: ShouldNotReachHere();
2739 }
2740 return (address)-1;
2741 }
2742 #endif
2743
2744 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2745 // Install a win32 structured exception handler around the test
2746 // function call so the VM can generate an error dump if needed.
2747 __try {
2748 (*funcPtr)();
2749 } __except(topLevelExceptionFilter(
2750 (_EXCEPTION_POINTERS*)_exception_info())) {
2751 // Nothing to do.
2752 }
2753 }
2754
2755 // Virtual Memory
2756
2757 int os::vm_page_size() { return os::win32::vm_page_size(); }
2758 int os::vm_allocation_granularity() {
2759 return os::win32::vm_allocation_granularity();
2760 }
2761
2762 // Windows large page support is available on Windows 2003. In order to use
2763 // large page memory, the administrator must first assign additional privilege
2764 // to the user:
2765 // + select Control Panel -> Administrative Tools -> Local Security Policy
2766 // + select Local Policies -> User Rights Assignment
2767 // + double click "Lock pages in memory", add users and/or groups
2768 // + reboot
2769 // Note the above steps are needed for administrator as well, as administrators
2770 // by default do not have the privilege to lock pages in memory.
2771 //
2772 // Note about Windows 2003: although the API supports committing large page
2773 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2774 // scenario, I found through experiment it only uses large page if the entire
2775 // memory region is reserved and committed in a single VirtualAlloc() call.
2776 // This makes Windows large page support more or less like Solaris ISM, in
2777 // that the entire heap must be committed upfront. This probably will change
2778 // in the future, if so the code below needs to be revisited.
2779
2780 #ifndef MEM_LARGE_PAGES
2781 #define MEM_LARGE_PAGES 0x20000000
2782 #endif
2783
2784 static HANDLE _hProcess;
2785 static HANDLE _hToken;
2786
2787 // Container for NUMA node list info
2788 class NUMANodeListHolder {
2789 private:
2790 int *_numa_used_node_list; // allocated below
2791 int _numa_used_node_count;
2792
2793 void free_node_list() {
2794 if (_numa_used_node_list != NULL) {
2795 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2796 }
2797 }
2798
2799 public:
2800 NUMANodeListHolder() {
2801 _numa_used_node_count = 0;
2802 _numa_used_node_list = NULL;
2803 // do rest of initialization in build routine (after function pointers are set up)
2804 }
2805
2806 ~NUMANodeListHolder() {
2807 free_node_list();
2808 }
2809
2810 bool build() {
2811 DWORD_PTR proc_aff_mask;
2812 DWORD_PTR sys_aff_mask;
2813 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2814 ULONG highest_node_number;
2815 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2816 free_node_list();
2817 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2818 for (unsigned int i = 0; i <= highest_node_number; i++) {
2819 ULONGLONG proc_mask_numa_node;
2820 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2821 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2822 _numa_used_node_list[_numa_used_node_count++] = i;
2823 }
2824 }
2825 return (_numa_used_node_count > 1);
2826 }
2827
2828 int get_count() {return _numa_used_node_count;}
2829 int get_node_list_entry(int n) {
2830 // for indexes out of range, returns -1
2831 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2832 }
2833
2834 } numa_node_list_holder;
2835
2836
2837
2838 static size_t _large_page_size = 0;
2839
2840 static bool resolve_functions_for_large_page_init() {
2841 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2842 os::Advapi32Dll::AdvapiAvailable();
2843 }
2844
2845 static bool request_lock_memory_privilege() {
2846 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2847 os::current_process_id());
2848
2849 LUID luid;
2850 if (_hProcess != NULL &&
2851 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2852 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2853
2854 TOKEN_PRIVILEGES tp;
2855 tp.PrivilegeCount = 1;
2856 tp.Privileges[0].Luid = luid;
2857 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2858
2859 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2860 // privilege. Check GetLastError() too. See MSDN document.
2861 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2862 (GetLastError() == ERROR_SUCCESS)) {
2863 return true;
2864 }
2865 }
2866
2867 return false;
2868 }
2869
2870 static void cleanup_after_large_page_init() {
2871 if (_hProcess) CloseHandle(_hProcess);
2872 _hProcess = NULL;
2873 if (_hToken) CloseHandle(_hToken);
2874 _hToken = NULL;
2875 }
2876
2877 static bool numa_interleaving_init() {
2878 bool success = false;
2879 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2880
2881 // print a warning if UseNUMAInterleaving flag is specified on command line
2882 bool warn_on_failure = use_numa_interleaving_specified;
2883 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2884
2885 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2886 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2887 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2888
2889 if (os::Kernel32Dll::NumaCallsAvailable()) {
2890 if (numa_node_list_holder.build()) {
2891 if (PrintMiscellaneous && Verbose) {
2892 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2893 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2894 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2895 }
2896 tty->print("\n");
2897 }
2898 success = true;
2899 } else {
2900 WARN("Process does not cover multiple NUMA nodes.");
2901 }
2902 } else {
2903 WARN("NUMA Interleaving is not supported by the operating system.");
2904 }
2905 if (!success) {
2906 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2907 }
2908 return success;
2909 #undef WARN
2910 }
2911
2912 // this routine is used whenever we need to reserve a contiguous VA range
2913 // but we need to make separate VirtualAlloc calls for each piece of the range
2914 // Reasons for doing this:
2915 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2916 // * UseNUMAInterleaving requires a separate node for each piece
2917 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2918 bool should_inject_error=false) {
2919 char * p_buf;
2920 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2921 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2922 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2923
2924 // first reserve enough address space in advance since we want to be
2925 // able to break a single contiguous virtual address range into multiple
2926 // large page commits but WS2003 does not allow reserving large page space
2927 // so we just use 4K pages for reserve, this gives us a legal contiguous
2928 // address space. then we will deallocate that reservation, and re alloc
2929 // using large pages
2930 const size_t size_of_reserve = bytes + chunk_size;
2931 if (bytes > size_of_reserve) {
2932 // Overflowed.
2933 return NULL;
2934 }
2935 p_buf = (char *) VirtualAlloc(addr,
2936 size_of_reserve, // size of Reserve
2937 MEM_RESERVE,
2938 PAGE_READWRITE);
2939 // If reservation failed, return NULL
2940 if (p_buf == NULL) return NULL;
2941 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2942 os::release_memory(p_buf, bytes + chunk_size);
2943
2944 // we still need to round up to a page boundary (in case we are using large pages)
2945 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2946 // instead we handle this in the bytes_to_rq computation below
2947 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2948
2949 // now go through and allocate one chunk at a time until all bytes are
2950 // allocated
2951 size_t bytes_remaining = bytes;
2952 // An overflow of align_size_up() would have been caught above
2953 // in the calculation of size_of_reserve.
2954 char * next_alloc_addr = p_buf;
2955 HANDLE hProc = GetCurrentProcess();
2956
2957 #ifdef ASSERT
2958 // Variable for the failure injection
2959 long ran_num = os::random();
2960 size_t fail_after = ran_num % bytes;
2961 #endif
2962
2963 int count=0;
2964 while (bytes_remaining) {
2965 // select bytes_to_rq to get to the next chunk_size boundary
2966
2967 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2968 // Note allocate and commit
2969 char * p_new;
2970
2971 #ifdef ASSERT
2972 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2973 #else
2974 const bool inject_error_now = false;
2975 #endif
2976
2977 if (inject_error_now) {
2978 p_new = NULL;
2979 } else {
2980 if (!UseNUMAInterleaving) {
2981 p_new = (char *) VirtualAlloc(next_alloc_addr,
2982 bytes_to_rq,
2983 flags,
2984 prot);
2985 } else {
2986 // get the next node to use from the used_node_list
2987 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2988 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2989 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2990 next_alloc_addr,
2991 bytes_to_rq,
2992 flags,
2993 prot,
2994 node);
2995 }
2996 }
2997
2998 if (p_new == NULL) {
2999 // Free any allocated pages
3000 if (next_alloc_addr > p_buf) {
3001 // Some memory was committed so release it.
3002 size_t bytes_to_release = bytes - bytes_remaining;
3003 // NMT has yet to record any individual blocks, so it
3004 // need to create a dummy 'reserve' record to match
3005 // the release.
3006 MemTracker::record_virtual_memory_reserve((address)p_buf,
3007 bytes_to_release, CALLER_PC);
3008 os::release_memory(p_buf, bytes_to_release);
3009 }
3010 #ifdef ASSERT
3011 if (should_inject_error) {
3012 if (TracePageSizes && Verbose) {
3013 tty->print_cr("Reserving pages individually failed.");
3014 }
3015 }
3016 #endif
3017 return NULL;
3018 }
3019
3020 bytes_remaining -= bytes_to_rq;
3021 next_alloc_addr += bytes_to_rq;
3022 count++;
3023 }
3024 // Although the memory is allocated individually, it is returned as one.
3025 // NMT records it as one block.
3026 if ((flags & MEM_COMMIT) != 0) {
3027 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3028 } else {
3029 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3030 }
3031
3032 // made it this far, success
3033 return p_buf;
3034 }
3035
3036
3037
3038 void os::large_page_init() {
3039 if (!UseLargePages) return;
3040
3041 // print a warning if any large page related flag is specified on command line
3042 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3043 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3044 bool success = false;
3045
3046 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3047 if (resolve_functions_for_large_page_init()) {
3048 if (request_lock_memory_privilege()) {
3049 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3050 if (s) {
3051 #if defined(IA32) || defined(AMD64)
3052 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3053 WARN("JVM cannot use large pages bigger than 4mb.");
3054 } else {
3055 #endif
3056 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3057 _large_page_size = LargePageSizeInBytes;
3058 } else {
3059 _large_page_size = s;
3060 }
3061 success = true;
3062 #if defined(IA32) || defined(AMD64)
3063 }
3064 #endif
3065 } else {
3066 WARN("Large page is not supported by the processor.");
3067 }
3068 } else {
3069 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3070 }
3071 } else {
3072 WARN("Large page is not supported by the operating system.");
3073 }
3074 #undef WARN
3075
3076 const size_t default_page_size = (size_t) vm_page_size();
3077 if (success && _large_page_size > default_page_size) {
3078 _page_sizes[0] = _large_page_size;
3079 _page_sizes[1] = default_page_size;
3080 _page_sizes[2] = 0;
3081 }
3082
3083 cleanup_after_large_page_init();
3084 UseLargePages = success;
3085 }
3086
3087 // On win32, one cannot release just a part of reserved memory, it's an
3088 // all or nothing deal. When we split a reservation, we must break the
3089 // reservation into two reservations.
3090 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3091 bool realloc) {
3092 if (size > 0) {
3093 release_memory(base, size);
3094 if (realloc) {
3095 reserve_memory(split, base);
3096 }
3097 if (size != split) {
3098 reserve_memory(size - split, base + split);
3099 }
3100 }
3101 }
3102
3103 // Multiple threads can race in this code but it's not possible to unmap small sections of
3104 // virtual space to get requested alignment, like posix-like os's.
3105 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3106 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3107 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3108 "Alignment must be a multiple of allocation granularity (page size)");
3109 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3110
3111 size_t extra_size = size + alignment;
3112 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3113
3114 char* aligned_base = NULL;
3115
3116 do {
3117 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3118 if (extra_base == NULL) {
3119 return NULL;
3120 }
3121 // Do manual alignment
3122 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3123
3124 os::release_memory(extra_base, extra_size);
3125
3126 aligned_base = os::reserve_memory(size, aligned_base);
3127
3128 } while (aligned_base == NULL);
3129
3130 return aligned_base;
3131 }
3132
3133 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3134 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3135 "reserve alignment");
3136 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3137 char* res;
3138 // note that if UseLargePages is on, all the areas that require interleaving
3139 // will go thru reserve_memory_special rather than thru here.
3140 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3141 if (!use_individual) {
3142 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3143 } else {
3144 elapsedTimer reserveTimer;
3145 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3146 // in numa interleaving, we have to allocate pages individually
3147 // (well really chunks of NUMAInterleaveGranularity size)
3148 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3149 if (res == NULL) {
3150 warning("NUMA page allocation failed");
3151 }
3152 if( Verbose && PrintMiscellaneous ) {
3153 reserveTimer.stop();
3154 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3155 reserveTimer.milliseconds(), reserveTimer.ticks());
3156 }
3157 }
3158 assert(res == NULL || addr == NULL || addr == res,
3159 "Unexpected address from reserve.");
3160
3161 return res;
3162 }
3163
3164 // Reserve memory at an arbitrary address, only if that area is
3165 // available (and not reserved for something else).
3166 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3167 // Windows os::reserve_memory() fails of the requested address range is
3168 // not avilable.
3169 return reserve_memory(bytes, requested_addr);
3170 }
3171
3172 size_t os::large_page_size() {
3173 return _large_page_size;
3174 }
3175
3176 bool os::can_commit_large_page_memory() {
3177 // Windows only uses large page memory when the entire region is reserved
3178 // and committed in a single VirtualAlloc() call. This may change in the
3179 // future, but with Windows 2003 it's not possible to commit on demand.
3180 return false;
3181 }
3182
3183 bool os::can_execute_large_page_memory() {
3184 return true;
3185 }
3186
3187 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3188 assert(UseLargePages, "only for large pages");
3189
3190 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3191 return NULL; // Fallback to small pages.
3192 }
3193
3194 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3195 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3196
3197 // with large pages, there are two cases where we need to use Individual Allocation
3198 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3199 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3200 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3201 if (TracePageSizes && Verbose) {
3202 tty->print_cr("Reserving large pages individually.");
3203 }
3204 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3205 if (p_buf == NULL) {
3206 // give an appropriate warning message
3207 if (UseNUMAInterleaving) {
3208 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3209 }
3210 if (UseLargePagesIndividualAllocation) {
3211 warning("Individually allocated large pages failed, "
3212 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3213 }
3214 return NULL;
3215 }
3216
3217 return p_buf;
3218
3219 } else {
3220 if (TracePageSizes && Verbose) {
3221 tty->print_cr("Reserving large pages in a single large chunk.");
3222 }
3223 // normal policy just allocate it all at once
3224 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3225 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3226 if (res != NULL) {
3227 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3228 }
3229
3230 return res;
3231 }
3232 }
3233
3234 bool os::release_memory_special(char* base, size_t bytes) {
3235 assert(base != NULL, "Sanity check");
3236 return release_memory(base, bytes);
3237 }
3238
3239 void os::print_statistics() {
3240 }
3241
3242 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3243 int err = os::get_last_error();
3244 char buf[256];
3245 size_t buf_len = os::lasterror(buf, sizeof(buf));
3246 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3247 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3248 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3249 }
3250
3251 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3252 if (bytes == 0) {
3253 // Don't bother the OS with noops.
3254 return true;
3255 }
3256 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3257 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3258 // Don't attempt to print anything if the OS call fails. We're
3259 // probably low on resources, so the print itself may cause crashes.
3260
3261 // unless we have NUMAInterleaving enabled, the range of a commit
3262 // is always within a reserve covered by a single VirtualAlloc
3263 // in that case we can just do a single commit for the requested size
3264 if (!UseNUMAInterleaving) {
3265 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3266 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3267 return false;
3268 }
3269 if (exec) {
3270 DWORD oldprot;
3271 // Windows doc says to use VirtualProtect to get execute permissions
3272 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3273 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3274 return false;
3275 }
3276 }
3277 return true;
3278 } else {
3279
3280 // when NUMAInterleaving is enabled, the commit might cover a range that
3281 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3282 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3283 // returns represents the number of bytes that can be committed in one step.
3284 size_t bytes_remaining = bytes;
3285 char * next_alloc_addr = addr;
3286 while (bytes_remaining > 0) {
3287 MEMORY_BASIC_INFORMATION alloc_info;
3288 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3289 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3290 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3291 PAGE_READWRITE) == NULL) {
3292 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3293 exec);)
3294 return false;
3295 }
3296 if (exec) {
3297 DWORD oldprot;
3298 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3299 PAGE_EXECUTE_READWRITE, &oldprot)) {
3300 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3301 exec);)
3302 return false;
3303 }
3304 }
3305 bytes_remaining -= bytes_to_rq;
3306 next_alloc_addr += bytes_to_rq;
3307 }
3308 }
3309 // if we made it this far, return true
3310 return true;
3311 }
3312
3313 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3314 bool exec) {
3315 // alignment_hint is ignored on this OS
3316 return pd_commit_memory(addr, size, exec);
3317 }
3318
3319 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3320 const char* mesg) {
3321 assert(mesg != NULL, "mesg must be specified");
3322 if (!pd_commit_memory(addr, size, exec)) {
3323 warn_fail_commit_memory(addr, size, exec);
3324 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3325 }
3326 }
3327
3328 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3329 size_t alignment_hint, bool exec,
3330 const char* mesg) {
3331 // alignment_hint is ignored on this OS
3332 pd_commit_memory_or_exit(addr, size, exec, mesg);
3333 }
3334
3335 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3336 if (bytes == 0) {
3337 // Don't bother the OS with noops.
3338 return true;
3339 }
3340 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3341 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3342 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3343 }
3344
3345 bool os::pd_release_memory(char* addr, size_t bytes) {
3346 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3347 }
3348
3349 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3350 return os::commit_memory(addr, size, !ExecMem);
3351 }
3352
3353 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3354 return os::uncommit_memory(addr, size);
3355 }
3356
3357 // Set protections specified
3358 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3359 bool is_committed) {
3360 unsigned int p = 0;
3361 switch (prot) {
3362 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3363 case MEM_PROT_READ: p = PAGE_READONLY; break;
3364 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3365 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3366 default:
3367 ShouldNotReachHere();
3368 }
3369
3370 DWORD old_status;
3371
3372 // Strange enough, but on Win32 one can change protection only for committed
3373 // memory, not a big deal anyway, as bytes less or equal than 64K
3374 if (!is_committed) {
3375 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3376 "cannot commit protection page");
3377 }
3378 // One cannot use os::guard_memory() here, as on Win32 guard page
3379 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3380 //
3381 // Pages in the region become guard pages. Any attempt to access a guard page
3382 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3383 // the guard page status. Guard pages thus act as a one-time access alarm.
3384 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3385 }
3386
3387 bool os::guard_memory(char* addr, size_t bytes) {
3388 DWORD old_status;
3389 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3390 }
3391
3392 bool os::unguard_memory(char* addr, size_t bytes) {
3393 DWORD old_status;
3394 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3395 }
3396
3397 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3398 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3399 void os::numa_make_global(char *addr, size_t bytes) { }
3400 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3401 bool os::numa_topology_changed() { return false; }
3402 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3403 int os::numa_get_group_id() { return 0; }
3404 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3405 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3406 // Provide an answer for UMA systems
3407 ids[0] = 0;
3408 return 1;
3409 } else {
3410 // check for size bigger than actual groups_num
3411 size = MIN2(size, numa_get_groups_num());
3412 for (int i = 0; i < (int)size; i++) {
3413 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3414 }
3415 return size;
3416 }
3417 }
3418
3419 bool os::get_page_info(char *start, page_info* info) {
3420 return false;
3421 }
3422
3423 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3424 return end;
3425 }
3426
3427 char* os::non_memory_address_word() {
3428 // Must never look like an address returned by reserve_memory,
3429 // even in its subfields (as defined by the CPU immediate fields,
3430 // if the CPU splits constants across multiple instructions).
3431 return (char*)-1;
3432 }
3433
3434 #define MAX_ERROR_COUNT 100
3435 #define SYS_THREAD_ERROR 0xffffffffUL
3436
3437 void os::pd_start_thread(Thread* thread) {
3438 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3439 // Returns previous suspend state:
3440 // 0: Thread was not suspended
3441 // 1: Thread is running now
3442 // >1: Thread is still suspended.
3443 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3444 }
3445
3446 class HighResolutionInterval : public CHeapObj<mtThread> {
3447 // The default timer resolution seems to be 10 milliseconds.
3448 // (Where is this written down?)
3449 // If someone wants to sleep for only a fraction of the default,
3450 // then we set the timer resolution down to 1 millisecond for
3451 // the duration of their interval.
3452 // We carefully set the resolution back, since otherwise we
3453 // seem to incur an overhead (3%?) that we don't need.
3454 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3455 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3456 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3457 // timeBeginPeriod() if the relative error exceeded some threshold.
3458 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3459 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3460 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3461 // resolution timers running.
3462 private:
3463 jlong resolution;
3464 public:
3465 HighResolutionInterval(jlong ms) {
3466 resolution = ms % 10L;
3467 if (resolution != 0) {
3468 MMRESULT result = timeBeginPeriod(1L);
3469 }
3470 }
3471 ~HighResolutionInterval() {
3472 if (resolution != 0) {
3473 MMRESULT result = timeEndPeriod(1L);
3474 }
3475 resolution = 0L;
3476 }
3477 };
3478
3479 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3480 jlong limit = (jlong) MAXDWORD;
3481
3482 while(ms > limit) {
3483 int res;
3484 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3485 return res;
3486 ms -= limit;
3487 }
3488
3489 assert(thread == Thread::current(), "thread consistency check");
3490 OSThread* osthread = thread->osthread();
3491 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3492 int result;
3493 if (interruptable) {
3494 assert(thread->is_Java_thread(), "must be java thread");
3495 JavaThread *jt = (JavaThread *) thread;
3496 ThreadBlockInVM tbivm(jt);
3497
3498 jt->set_suspend_equivalent();
3499 // cleared by handle_special_suspend_equivalent_condition() or
3500 // java_suspend_self() via check_and_wait_while_suspended()
3501
3502 HANDLE events[1];
3503 events[0] = osthread->interrupt_event();
3504 HighResolutionInterval *phri=NULL;
3505 if(!ForceTimeHighResolution)
3506 phri = new HighResolutionInterval( ms );
3507 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3508 result = OS_TIMEOUT;
3509 } else {
3510 ResetEvent(osthread->interrupt_event());
3511 osthread->set_interrupted(false);
3512 result = OS_INTRPT;
3513 }
3514 delete phri; //if it is NULL, harmless
3515
3516 // were we externally suspended while we were waiting?
3517 jt->check_and_wait_while_suspended();
3518 } else {
3519 assert(!thread->is_Java_thread(), "must not be java thread");
3520 Sleep((long) ms);
3521 result = OS_TIMEOUT;
3522 }
3523 return result;
3524 }
3525
3526 //
3527 // Short sleep, direct OS call.
3528 //
3529 // ms = 0, means allow others (if any) to run.
3530 //
3531 void os::naked_short_sleep(jlong ms) {
3532 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3533 Sleep(ms);
3534 }
3535
3536 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3537 void os::infinite_sleep() {
3538 while (true) { // sleep forever ...
3539 Sleep(100000); // ... 100 seconds at a time
3540 }
3541 }
3542
3543 typedef BOOL (WINAPI * STTSignature)(void) ;
3544
3545 os::YieldResult os::NakedYield() {
3546 // Use either SwitchToThread() or Sleep(0)
3547 // Consider passing back the return value from SwitchToThread().
3548 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3549 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3550 } else {
3551 Sleep(0);
3552 }
3553 return os::YIELD_UNKNOWN ;
3554 }
3555
3556 void os::yield() { os::NakedYield(); }
3557
3558 void os::yield_all(int attempts) {
3559 // Yields to all threads, including threads with lower priorities
3560 Sleep(1);
3561 }
3562
3563 // Win32 only gives you access to seven real priorities at a time,
3564 // so we compress Java's ten down to seven. It would be better
3565 // if we dynamically adjusted relative priorities.
3566
3567 int os::java_to_os_priority[CriticalPriority + 1] = {
3568 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3569 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3570 THREAD_PRIORITY_LOWEST, // 2
3571 THREAD_PRIORITY_BELOW_NORMAL, // 3
3572 THREAD_PRIORITY_BELOW_NORMAL, // 4
3573 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3574 THREAD_PRIORITY_NORMAL, // 6
3575 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3576 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3577 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3578 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3579 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3580 };
3581
3582 int prio_policy1[CriticalPriority + 1] = {
3583 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3584 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3585 THREAD_PRIORITY_LOWEST, // 2
3586 THREAD_PRIORITY_BELOW_NORMAL, // 3
3587 THREAD_PRIORITY_BELOW_NORMAL, // 4
3588 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3589 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3590 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3591 THREAD_PRIORITY_HIGHEST, // 8
3592 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3593 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3594 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3595 };
3596
3597 static int prio_init() {
3598 // If ThreadPriorityPolicy is 1, switch tables
3599 if (ThreadPriorityPolicy == 1) {
3600 int i;
3601 for (i = 0; i < CriticalPriority + 1; i++) {
3602 os::java_to_os_priority[i] = prio_policy1[i];
3603 }
3604 }
3605 if (UseCriticalJavaThreadPriority) {
3606 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3607 }
3608 return 0;
3609 }
3610
3611 OSReturn os::set_native_priority(Thread* thread, int priority) {
3612 if (!UseThreadPriorities) return OS_OK;
3613 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3614 return ret ? OS_OK : OS_ERR;
3615 }
3616
3617 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3618 if ( !UseThreadPriorities ) {
3619 *priority_ptr = java_to_os_priority[NormPriority];
3620 return OS_OK;
3621 }
3622 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3623 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3624 assert(false, "GetThreadPriority failed");
3625 return OS_ERR;
3626 }
3627 *priority_ptr = os_prio;
3628 return OS_OK;
3629 }
3630
3631
3632 // Hint to the underlying OS that a task switch would not be good.
3633 // Void return because it's a hint and can fail.
3634 void os::hint_no_preempt() {}
3635
3636 void os::interrupt(Thread* thread) {
3637 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3638 "possibility of dangling Thread pointer");
3639
3640 OSThread* osthread = thread->osthread();
3641 osthread->set_interrupted(true);
3642 // More than one thread can get here with the same value of osthread,
3643 // resulting in multiple notifications. We do, however, want the store
3644 // to interrupted() to be visible to other threads before we post
3645 // the interrupt event.
3646 OrderAccess::release();
3647 SetEvent(osthread->interrupt_event());
3648 // For JSR166: unpark after setting status
3649 if (thread->is_Java_thread())
3650 ((JavaThread*)thread)->parker()->unpark();
3651
3652 ParkEvent * ev = thread->_ParkEvent ;
3653 if (ev != NULL) ev->unpark() ;
3654
3655 }
3656
3657
3658 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3659 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3660 "possibility of dangling Thread pointer");
3661
3662 OSThread* osthread = thread->osthread();
3663 // There is no synchronization between the setting of the interrupt
3664 // and it being cleared here. It is critical - see 6535709 - that
3665 // we only clear the interrupt state, and reset the interrupt event,
3666 // if we are going to report that we were indeed interrupted - else
3667 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3668 // depending on the timing. By checking thread interrupt event to see
3669 // if the thread gets real interrupt thus prevent spurious wakeup.
3670 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3671 if (interrupted && clear_interrupted) {
3672 osthread->set_interrupted(false);
3673 ResetEvent(osthread->interrupt_event());
3674 } // Otherwise leave the interrupted state alone
3675
3676 return interrupted;
3677 }
3678
3679 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3680 ExtendedPC os::get_thread_pc(Thread* thread) {
3681 CONTEXT context;
3682 context.ContextFlags = CONTEXT_CONTROL;
3683 HANDLE handle = thread->osthread()->thread_handle();
3684 #ifdef _M_IA64
3685 assert(0, "Fix get_thread_pc");
3686 return ExtendedPC(NULL);
3687 #else
3688 if (GetThreadContext(handle, &context)) {
3689 #ifdef _M_AMD64
3690 return ExtendedPC((address) context.Rip);
3691 #else
3692 return ExtendedPC((address) context.Eip);
3693 #endif
3694 } else {
3695 return ExtendedPC(NULL);
3696 }
3697 #endif
3698 }
3699
3700 // GetCurrentThreadId() returns DWORD
3701 intx os::current_thread_id() { return GetCurrentThreadId(); }
3702
3703 static int _initial_pid = 0;
3704
3705 int os::current_process_id()
3706 {
3707 return (_initial_pid ? _initial_pid : _getpid());
3708 }
3709
3710 int os::win32::_vm_page_size = 0;
3711 int os::win32::_vm_allocation_granularity = 0;
3712 int os::win32::_processor_type = 0;
3713 // Processor level is not available on non-NT systems, use vm_version instead
3714 int os::win32::_processor_level = 0;
3715 julong os::win32::_physical_memory = 0;
3716 size_t os::win32::_default_stack_size = 0;
3717
3718 intx os::win32::_os_thread_limit = 0;
3719 volatile intx os::win32::_os_thread_count = 0;
3720
3721 bool os::win32::_is_nt = false;
3722 bool os::win32::_is_windows_2003 = false;
3723 bool os::win32::_is_windows_server = false;
3724
3725 void os::win32::initialize_system_info() {
3726 SYSTEM_INFO si;
3727 GetSystemInfo(&si);
3728 _vm_page_size = si.dwPageSize;
3729 _vm_allocation_granularity = si.dwAllocationGranularity;
3730 _processor_type = si.dwProcessorType;
3731 _processor_level = si.wProcessorLevel;
3732 set_processor_count(si.dwNumberOfProcessors);
3733
3734 MEMORYSTATUSEX ms;
3735 ms.dwLength = sizeof(ms);
3736
3737 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3738 // dwMemoryLoad (% of memory in use)
3739 GlobalMemoryStatusEx(&ms);
3740 _physical_memory = ms.ullTotalPhys;
3741
3742 OSVERSIONINFOEX oi;
3743 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3744 GetVersionEx((OSVERSIONINFO*)&oi);
3745 switch(oi.dwPlatformId) {
3746 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3747 case VER_PLATFORM_WIN32_NT:
3748 _is_nt = true;
3749 {
3750 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3751 if (os_vers == 5002) {
3752 _is_windows_2003 = true;
3753 }
3754 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3755 oi.wProductType == VER_NT_SERVER) {
3756 _is_windows_server = true;
3757 }
3758 }
3759 break;
3760 default: fatal("Unknown platform");
3761 }
3762
3763 _default_stack_size = os::current_stack_size();
3764 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3765 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3766 "stack size not a multiple of page size");
3767
3768 initialize_performance_counter();
3769
3770 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3771 // known to deadlock the system, if the VM issues to thread operations with
3772 // a too high frequency, e.g., such as changing the priorities.
3773 // The 6000 seems to work well - no deadlocks has been notices on the test
3774 // programs that we have seen experience this problem.
3775 if (!os::win32::is_nt()) {
3776 StarvationMonitorInterval = 6000;
3777 }
3778 }
3779
3780
3781 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3782 char path[MAX_PATH];
3783 DWORD size;
3784 DWORD pathLen = (DWORD)sizeof(path);
3785 HINSTANCE result = NULL;
3786
3787 // only allow library name without path component
3788 assert(strchr(name, '\\') == NULL, "path not allowed");
3789 assert(strchr(name, ':') == NULL, "path not allowed");
3790 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3791 jio_snprintf(ebuf, ebuflen,
3792 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3793 return NULL;
3794 }
3795
3796 // search system directory
3797 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3798 strcat(path, "\\");
3799 strcat(path, name);
3800 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3801 return result;
3802 }
3803 }
3804
3805 // try Windows directory
3806 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3807 strcat(path, "\\");
3808 strcat(path, name);
3809 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3810 return result;
3811 }
3812 }
3813
3814 jio_snprintf(ebuf, ebuflen,
3815 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3816 return NULL;
3817 }
3818
3819 void os::win32::setmode_streams() {
3820 _setmode(_fileno(stdin), _O_BINARY);
3821 _setmode(_fileno(stdout), _O_BINARY);
3822 _setmode(_fileno(stderr), _O_BINARY);
3823 }
3824
3825
3826 bool os::is_debugger_attached() {
3827 return IsDebuggerPresent() ? true : false;
3828 }
3829
3830
3831 void os::wait_for_keypress_at_exit(void) {
3832 if (PauseAtExit) {
3833 fprintf(stderr, "Press any key to continue...\n");
3834 fgetc(stdin);
3835 }
3836 }
3837
3838
3839 int os::message_box(const char* title, const char* message) {
3840 int result = MessageBox(NULL, message, title,
3841 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3842 return result == IDYES;
3843 }
3844
3845 int os::allocate_thread_local_storage() {
3846 return TlsAlloc();
3847 }
3848
3849
3850 void os::free_thread_local_storage(int index) {
3851 TlsFree(index);
3852 }
3853
3854
3855 void os::thread_local_storage_at_put(int index, void* value) {
3856 TlsSetValue(index, value);
3857 assert(thread_local_storage_at(index) == value, "Just checking");
3858 }
3859
3860
3861 void* os::thread_local_storage_at(int index) {
3862 return TlsGetValue(index);
3863 }
3864
3865
3866 #ifndef PRODUCT
3867 #ifndef _WIN64
3868 // Helpers to check whether NX protection is enabled
3869 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3870 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3871 pex->ExceptionRecord->NumberParameters > 0 &&
3872 pex->ExceptionRecord->ExceptionInformation[0] ==
3873 EXCEPTION_INFO_EXEC_VIOLATION) {
3874 return EXCEPTION_EXECUTE_HANDLER;
3875 }
3876 return EXCEPTION_CONTINUE_SEARCH;
3877 }
3878
3879 void nx_check_protection() {
3880 // If NX is enabled we'll get an exception calling into code on the stack
3881 char code[] = { (char)0xC3 }; // ret
3882 void *code_ptr = (void *)code;
3883 __try {
3884 __asm call code_ptr
3885 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3886 tty->print_raw_cr("NX protection detected.");
3887 }
3888 }
3889 #endif // _WIN64
3890 #endif // PRODUCT
3891
3892 // this is called _before_ the global arguments have been parsed
3893 void os::init(void) {
3894 _initial_pid = _getpid();
3895
3896 init_random(1234567);
3897
3898 win32::initialize_system_info();
3899 win32::setmode_streams();
3900 init_page_sizes((size_t) win32::vm_page_size());
3901
3902 // For better scalability on MP systems (must be called after initialize_system_info)
3903 #ifndef PRODUCT
3904 if (is_MP()) {
3905 NoYieldsInMicrolock = true;
3906 }
3907 #endif
3908 // This may be overridden later when argument processing is done.
3909 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3910 os::win32::is_windows_2003());
3911
3912 // Initialize main_process and main_thread
3913 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3914 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3915 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3916 fatal("DuplicateHandle failed\n");
3917 }
3918 main_thread_id = (int) GetCurrentThreadId();
3919 }
3920
3921 // To install functions for atexit processing
3922 extern "C" {
3923 static void perfMemory_exit_helper() {
3924 perfMemory_exit();
3925 }
3926 }
3927
3928 static jint initSock();
3929
3930 // this is called _after_ the global arguments have been parsed
3931 jint os::init_2(void) {
3932 // Allocate a single page and mark it as readable for safepoint polling
3933 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3934 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3935
3936 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3937 guarantee( return_page != NULL, "Commit Failed for polling page");
3938
3939 os::set_polling_page( polling_page );
3940
3941 #ifndef PRODUCT
3942 if( Verbose && PrintMiscellaneous )
3943 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3944 #endif
3945
3946 if (!UseMembar) {
3947 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3948 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3949
3950 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3951 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3952
3953 os::set_memory_serialize_page( mem_serialize_page );
3954
3955 #ifndef PRODUCT
3956 if(Verbose && PrintMiscellaneous)
3957 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3958 #endif
3959 }
3960
3961 // Setup Windows Exceptions
3962
3963 // for debugging float code generation bugs
3964 if (ForceFloatExceptions) {
3965 #ifndef _WIN64
3966 static long fp_control_word = 0;
3967 __asm { fstcw fp_control_word }
3968 // see Intel PPro Manual, Vol. 2, p 7-16
3969 const long precision = 0x20;
3970 const long underflow = 0x10;
3971 const long overflow = 0x08;
3972 const long zero_div = 0x04;
3973 const long denorm = 0x02;
3974 const long invalid = 0x01;
3975 fp_control_word |= invalid;
3976 __asm { fldcw fp_control_word }
3977 #endif
3978 }
3979
3980 // If stack_commit_size is 0, windows will reserve the default size,
3981 // but only commit a small portion of it.
3982 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3983 size_t default_reserve_size = os::win32::default_stack_size();
3984 size_t actual_reserve_size = stack_commit_size;
3985 if (stack_commit_size < default_reserve_size) {
3986 // If stack_commit_size == 0, we want this too
3987 actual_reserve_size = default_reserve_size;
3988 }
3989
3990 // Check minimum allowable stack size for thread creation and to initialize
3991 // the java system classes, including StackOverflowError - depends on page
3992 // size. Add a page for compiler2 recursion in main thread.
3993 // Add in 2*BytesPerWord times page size to account for VM stack during
3994 // class initialization depending on 32 or 64 bit VM.
3995 size_t min_stack_allowed =
3996 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3997 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3998 if (actual_reserve_size < min_stack_allowed) {
3999 tty->print_cr("\nThe stack size specified is too small, "
4000 "Specify at least %dk",
4001 min_stack_allowed / K);
4002 return JNI_ERR;
4003 }
4004
4005 JavaThread::set_stack_size_at_create(stack_commit_size);
4006
4007 // Calculate theoretical max. size of Threads to guard gainst artifical
4008 // out-of-memory situations, where all available address-space has been
4009 // reserved by thread stacks.
4010 assert(actual_reserve_size != 0, "Must have a stack");
4011
4012 // Calculate the thread limit when we should start doing Virtual Memory
4013 // banging. Currently when the threads will have used all but 200Mb of space.
4014 //
4015 // TODO: consider performing a similar calculation for commit size instead
4016 // as reserve size, since on a 64-bit platform we'll run into that more
4017 // often than running out of virtual memory space. We can use the
4018 // lower value of the two calculations as the os_thread_limit.
4019 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4020 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4021
4022 // at exit methods are called in the reverse order of their registration.
4023 // there is no limit to the number of functions registered. atexit does
4024 // not set errno.
4025
4026 if (PerfAllowAtExitRegistration) {
4027 // only register atexit functions if PerfAllowAtExitRegistration is set.
4028 // atexit functions can be delayed until process exit time, which
4029 // can be problematic for embedded VM situations. Embedded VMs should
4030 // call DestroyJavaVM() to assure that VM resources are released.
4031
4032 // note: perfMemory_exit_helper atexit function may be removed in
4033 // the future if the appropriate cleanup code can be added to the
4034 // VM_Exit VMOperation's doit method.
4035 if (atexit(perfMemory_exit_helper) != 0) {
4036 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4037 }
4038 }
4039
4040 #ifndef _WIN64
4041 // Print something if NX is enabled (win32 on AMD64)
4042 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4043 #endif
4044
4045 // initialize thread priority policy
4046 prio_init();
4047
4048 if (UseNUMA && !ForceNUMA) {
4049 UseNUMA = false; // We don't fully support this yet
4050 }
4051
4052 if (UseNUMAInterleaving) {
4053 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4054 bool success = numa_interleaving_init();
4055 if (!success) UseNUMAInterleaving = false;
4056 }
4057
4058 if (initSock() != JNI_OK) {
4059 return JNI_ERR;
4060 }
4061
4062 return JNI_OK;
4063 }
4064
4065 // Mark the polling page as unreadable
4066 void os::make_polling_page_unreadable(void) {
4067 DWORD old_status;
4068 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4069 fatal("Could not disable polling page");
4070 };
4071
4072 // Mark the polling page as readable
4073 void os::make_polling_page_readable(void) {
4074 DWORD old_status;
4075 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4076 fatal("Could not enable polling page");
4077 };
4078
4079
4080 int os::stat(const char *path, struct stat *sbuf) {
4081 char pathbuf[MAX_PATH];
4082 if (strlen(path) > MAX_PATH - 1) {
4083 errno = ENAMETOOLONG;
4084 return -1;
4085 }
4086 os::native_path(strcpy(pathbuf, path));
4087 int ret = ::stat(pathbuf, sbuf);
4088 if (sbuf != NULL && UseUTCFileTimestamp) {
4089 // Fix for 6539723. st_mtime returned from stat() is dependent on
4090 // the system timezone and so can return different values for the
4091 // same file if/when daylight savings time changes. This adjustment
4092 // makes sure the same timestamp is returned regardless of the TZ.
4093 //
4094 // See:
4095 // http://msdn.microsoft.com/library/
4096 // default.asp?url=/library/en-us/sysinfo/base/
4097 // time_zone_information_str.asp
4098 // and
4099 // http://msdn.microsoft.com/library/default.asp?url=
4100 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4101 //
4102 // NOTE: there is a insidious bug here: If the timezone is changed
4103 // after the call to stat() but before 'GetTimeZoneInformation()', then
4104 // the adjustment we do here will be wrong and we'll return the wrong
4105 // value (which will likely end up creating an invalid class data
4106 // archive). Absent a better API for this, or some time zone locking
4107 // mechanism, we'll have to live with this risk.
4108 TIME_ZONE_INFORMATION tz;
4109 DWORD tzid = GetTimeZoneInformation(&tz);
4110 int daylightBias =
4111 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4112 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4113 }
4114 return ret;
4115 }
4116
4117
4118 #define FT2INT64(ft) \
4119 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4120
4121
4122 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4123 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4124 // of a thread.
4125 //
4126 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4127 // the fast estimate available on the platform.
4128
4129 // current_thread_cpu_time() is not optimized for Windows yet
4130 jlong os::current_thread_cpu_time() {
4131 // return user + sys since the cost is the same
4132 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4133 }
4134
4135 jlong os::thread_cpu_time(Thread* thread) {
4136 // consistent with what current_thread_cpu_time() returns.
4137 return os::thread_cpu_time(thread, true /* user+sys */);
4138 }
4139
4140 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4141 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4142 }
4143
4144 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4145 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4146 // If this function changes, os::is_thread_cpu_time_supported() should too
4147 if (os::win32::is_nt()) {
4148 FILETIME CreationTime;
4149 FILETIME ExitTime;
4150 FILETIME KernelTime;
4151 FILETIME UserTime;
4152
4153 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4154 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4155 return -1;
4156 else
4157 if (user_sys_cpu_time) {
4158 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4159 } else {
4160 return FT2INT64(UserTime) * 100;
4161 }
4162 } else {
4163 return (jlong) timeGetTime() * 1000000;
4164 }
4165 }
4166
4167 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4168 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4169 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4170 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4171 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4172 }
4173
4174 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4175 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4176 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4177 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4178 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4179 }
4180
4181 bool os::is_thread_cpu_time_supported() {
4182 // see os::thread_cpu_time
4183 if (os::win32::is_nt()) {
4184 FILETIME CreationTime;
4185 FILETIME ExitTime;
4186 FILETIME KernelTime;
4187 FILETIME UserTime;
4188
4189 if ( GetThreadTimes(GetCurrentThread(),
4190 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4191 return false;
4192 else
4193 return true;
4194 } else {
4195 return false;
4196 }
4197 }
4198
4199 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4200 // It does have primitives (PDH API) to get CPU usage and run queue length.
4201 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4202 // If we wanted to implement loadavg on Windows, we have a few options:
4203 //
4204 // a) Query CPU usage and run queue length and "fake" an answer by
4205 // returning the CPU usage if it's under 100%, and the run queue
4206 // length otherwise. It turns out that querying is pretty slow
4207 // on Windows, on the order of 200 microseconds on a fast machine.
4208 // Note that on the Windows the CPU usage value is the % usage
4209 // since the last time the API was called (and the first call
4210 // returns 100%), so we'd have to deal with that as well.
4211 //
4212 // b) Sample the "fake" answer using a sampling thread and store
4213 // the answer in a global variable. The call to loadavg would
4214 // just return the value of the global, avoiding the slow query.
4215 //
4216 // c) Sample a better answer using exponential decay to smooth the
4217 // value. This is basically the algorithm used by UNIX kernels.
4218 //
4219 // Note that sampling thread starvation could affect both (b) and (c).
4220 int os::loadavg(double loadavg[], int nelem) {
4221 return -1;
4222 }
4223
4224
4225 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4226 bool os::dont_yield() {
4227 return DontYieldALot;
4228 }
4229
4230 // This method is a slightly reworked copy of JDK's sysOpen
4231 // from src/windows/hpi/src/sys_api_md.c
4232
4233 int os::open(const char *path, int oflag, int mode) {
4234 char pathbuf[MAX_PATH];
4235
4236 if (strlen(path) > MAX_PATH - 1) {
4237 errno = ENAMETOOLONG;
4238 return -1;
4239 }
4240 os::native_path(strcpy(pathbuf, path));
4241 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4242 }
4243
4244 FILE* os::open(int fd, const char* mode) {
4245 return ::_fdopen(fd, mode);
4246 }
4247
4248 // Is a (classpath) directory empty?
4249 bool os::dir_is_empty(const char* path) {
4250 WIN32_FIND_DATA fd;
4251 HANDLE f = FindFirstFile(path, &fd);
4252 if (f == INVALID_HANDLE_VALUE) {
4253 return true;
4254 }
4255 FindClose(f);
4256 return false;
4257 }
4258
4259 // create binary file, rewriting existing file if required
4260 int os::create_binary_file(const char* path, bool rewrite_existing) {
4261 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4262 if (!rewrite_existing) {
4263 oflags |= _O_EXCL;
4264 }
4265 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4266 }
4267
4268 // return current position of file pointer
4269 jlong os::current_file_offset(int fd) {
4270 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4271 }
4272
4273 // move file pointer to the specified offset
4274 jlong os::seek_to_file_offset(int fd, jlong offset) {
4275 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4276 }
4277
4278
4279 jlong os::lseek(int fd, jlong offset, int whence) {
4280 return (jlong) ::_lseeki64(fd, offset, whence);
4281 }
4282
4283 // This method is a slightly reworked copy of JDK's sysNativePath
4284 // from src/windows/hpi/src/path_md.c
4285
4286 /* Convert a pathname to native format. On win32, this involves forcing all
4287 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4288 sometimes rejects '/') and removing redundant separators. The input path is
4289 assumed to have been converted into the character encoding used by the local
4290 system. Because this might be a double-byte encoding, care is taken to
4291 treat double-byte lead characters correctly.
4292
4293 This procedure modifies the given path in place, as the result is never
4294 longer than the original. There is no error return; this operation always
4295 succeeds. */
4296 char * os::native_path(char *path) {
4297 char *src = path, *dst = path, *end = path;
4298 char *colon = NULL; /* If a drive specifier is found, this will
4299 point to the colon following the drive
4300 letter */
4301
4302 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4303 assert(((!::IsDBCSLeadByte('/'))
4304 && (!::IsDBCSLeadByte('\\'))
4305 && (!::IsDBCSLeadByte(':'))),
4306 "Illegal lead byte");
4307
4308 /* Check for leading separators */
4309 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4310 while (isfilesep(*src)) {
4311 src++;
4312 }
4313
4314 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4315 /* Remove leading separators if followed by drive specifier. This
4316 hack is necessary to support file URLs containing drive
4317 specifiers (e.g., "file://c:/path"). As a side effect,
4318 "/c:/path" can be used as an alternative to "c:/path". */
4319 *dst++ = *src++;
4320 colon = dst;
4321 *dst++ = ':';
4322 src++;
4323 } else {
4324 src = path;
4325 if (isfilesep(src[0]) && isfilesep(src[1])) {
4326 /* UNC pathname: Retain first separator; leave src pointed at
4327 second separator so that further separators will be collapsed
4328 into the second separator. The result will be a pathname
4329 beginning with "\\\\" followed (most likely) by a host name. */
4330 src = dst = path + 1;
4331 path[0] = '\\'; /* Force first separator to '\\' */
4332 }
4333 }
4334
4335 end = dst;
4336
4337 /* Remove redundant separators from remainder of path, forcing all
4338 separators to be '\\' rather than '/'. Also, single byte space
4339 characters are removed from the end of the path because those
4340 are not legal ending characters on this operating system.
4341 */
4342 while (*src != '\0') {
4343 if (isfilesep(*src)) {
4344 *dst++ = '\\'; src++;
4345 while (isfilesep(*src)) src++;
4346 if (*src == '\0') {
4347 /* Check for trailing separator */
4348 end = dst;
4349 if (colon == dst - 2) break; /* "z:\\" */
4350 if (dst == path + 1) break; /* "\\" */
4351 if (dst == path + 2 && isfilesep(path[0])) {
4352 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4353 beginning of a UNC pathname. Even though it is not, by
4354 itself, a valid UNC pathname, we leave it as is in order
4355 to be consistent with the path canonicalizer as well
4356 as the win32 APIs, which treat this case as an invalid
4357 UNC pathname rather than as an alias for the root
4358 directory of the current drive. */
4359 break;
4360 }
4361 end = --dst; /* Path does not denote a root directory, so
4362 remove trailing separator */
4363 break;
4364 }
4365 end = dst;
4366 } else {
4367 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4368 *dst++ = *src++;
4369 if (*src) *dst++ = *src++;
4370 end = dst;
4371 } else { /* Copy a single-byte character */
4372 char c = *src++;
4373 *dst++ = c;
4374 /* Space is not a legal ending character */
4375 if (c != ' ') end = dst;
4376 }
4377 }
4378 }
4379
4380 *end = '\0';
4381
4382 /* For "z:", add "." to work around a bug in the C runtime library */
4383 if (colon == dst - 1) {
4384 path[2] = '.';
4385 path[3] = '\0';
4386 }
4387
4388 return path;
4389 }
4390
4391 // This code is a copy of JDK's sysSetLength
4392 // from src/windows/hpi/src/sys_api_md.c
4393
4394 int os::ftruncate(int fd, jlong length) {
4395 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4396 long high = (long)(length >> 32);
4397 DWORD ret;
4398
4399 if (h == (HANDLE)(-1)) {
4400 return -1;
4401 }
4402
4403 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4404 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4405 return -1;
4406 }
4407
4408 if (::SetEndOfFile(h) == FALSE) {
4409 return -1;
4410 }
4411
4412 return 0;
4413 }
4414
4415
4416 // This code is a copy of JDK's sysSync
4417 // from src/windows/hpi/src/sys_api_md.c
4418 // except for the legacy workaround for a bug in Win 98
4419
4420 int os::fsync(int fd) {
4421 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4422
4423 if ( (!::FlushFileBuffers(handle)) &&
4424 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4425 /* from winerror.h */
4426 return -1;
4427 }
4428 return 0;
4429 }
4430
4431 static int nonSeekAvailable(int, long *);
4432 static int stdinAvailable(int, long *);
4433
4434 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4435 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4436
4437 // This code is a copy of JDK's sysAvailable
4438 // from src/windows/hpi/src/sys_api_md.c
4439
4440 int os::available(int fd, jlong *bytes) {
4441 jlong cur, end;
4442 struct _stati64 stbuf64;
4443
4444 if (::_fstati64(fd, &stbuf64) >= 0) {
4445 int mode = stbuf64.st_mode;
4446 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4447 int ret;
4448 long lpbytes;
4449 if (fd == 0) {
4450 ret = stdinAvailable(fd, &lpbytes);
4451 } else {
4452 ret = nonSeekAvailable(fd, &lpbytes);
4453 }
4454 (*bytes) = (jlong)(lpbytes);
4455 return ret;
4456 }
4457 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4458 return FALSE;
4459 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4460 return FALSE;
4461 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4462 return FALSE;
4463 }
4464 *bytes = end - cur;
4465 return TRUE;
4466 } else {
4467 return FALSE;
4468 }
4469 }
4470
4471 // This code is a copy of JDK's nonSeekAvailable
4472 // from src/windows/hpi/src/sys_api_md.c
4473
4474 static int nonSeekAvailable(int fd, long *pbytes) {
4475 /* This is used for available on non-seekable devices
4476 * (like both named and anonymous pipes, such as pipes
4477 * connected to an exec'd process).
4478 * Standard Input is a special case.
4479 *
4480 */
4481 HANDLE han;
4482
4483 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4484 return FALSE;
4485 }
4486
4487 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4488 /* PeekNamedPipe fails when at EOF. In that case we
4489 * simply make *pbytes = 0 which is consistent with the
4490 * behavior we get on Solaris when an fd is at EOF.
4491 * The only alternative is to raise an Exception,
4492 * which isn't really warranted.
4493 */
4494 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4495 return FALSE;
4496 }
4497 *pbytes = 0;
4498 }
4499 return TRUE;
4500 }
4501
4502 #define MAX_INPUT_EVENTS 2000
4503
4504 // This code is a copy of JDK's stdinAvailable
4505 // from src/windows/hpi/src/sys_api_md.c
4506
4507 static int stdinAvailable(int fd, long *pbytes) {
4508 HANDLE han;
4509 DWORD numEventsRead = 0; /* Number of events read from buffer */
4510 DWORD numEvents = 0; /* Number of events in buffer */
4511 DWORD i = 0; /* Loop index */
4512 DWORD curLength = 0; /* Position marker */
4513 DWORD actualLength = 0; /* Number of bytes readable */
4514 BOOL error = FALSE; /* Error holder */
4515 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4516
4517 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4518 return FALSE;
4519 }
4520
4521 /* Construct an array of input records in the console buffer */
4522 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4523 if (error == 0) {
4524 return nonSeekAvailable(fd, pbytes);
4525 }
4526
4527 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4528 if (numEvents > MAX_INPUT_EVENTS) {
4529 numEvents = MAX_INPUT_EVENTS;
4530 }
4531
4532 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4533 if (lpBuffer == NULL) {
4534 return FALSE;
4535 }
4536
4537 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4538 if (error == 0) {
4539 os::free(lpBuffer, mtInternal);
4540 return FALSE;
4541 }
4542
4543 /* Examine input records for the number of bytes available */
4544 for(i=0; i<numEvents; i++) {
4545 if (lpBuffer[i].EventType == KEY_EVENT) {
4546
4547 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4548 &(lpBuffer[i].Event);
4549 if (keyRecord->bKeyDown == TRUE) {
4550 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4551 curLength++;
4552 if (*keyPressed == '\r') {
4553 actualLength = curLength;
4554 }
4555 }
4556 }
4557 }
4558
4559 if(lpBuffer != NULL) {
4560 os::free(lpBuffer, mtInternal);
4561 }
4562
4563 *pbytes = (long) actualLength;
4564 return TRUE;
4565 }
4566
4567 // Map a block of memory.
4568 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4569 char *addr, size_t bytes, bool read_only,
4570 bool allow_exec) {
4571 HANDLE hFile;
4572 char* base;
4573
4574 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4575 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4576 if (hFile == NULL) {
4577 if (PrintMiscellaneous && Verbose) {
4578 DWORD err = GetLastError();
4579 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4580 }
4581 return NULL;
4582 }
4583
4584 if (allow_exec) {
4585 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4586 // unless it comes from a PE image (which the shared archive is not.)
4587 // Even VirtualProtect refuses to give execute access to mapped memory
4588 // that was not previously executable.
4589 //
4590 // Instead, stick the executable region in anonymous memory. Yuck.
4591 // Penalty is that ~4 pages will not be shareable - in the future
4592 // we might consider DLLizing the shared archive with a proper PE
4593 // header so that mapping executable + sharing is possible.
4594
4595 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4596 PAGE_READWRITE);
4597 if (base == NULL) {
4598 if (PrintMiscellaneous && Verbose) {
4599 DWORD err = GetLastError();
4600 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4601 }
4602 CloseHandle(hFile);
4603 return NULL;
4604 }
4605
4606 DWORD bytes_read;
4607 OVERLAPPED overlapped;
4608 overlapped.Offset = (DWORD)file_offset;
4609 overlapped.OffsetHigh = 0;
4610 overlapped.hEvent = NULL;
4611 // ReadFile guarantees that if the return value is true, the requested
4612 // number of bytes were read before returning.
4613 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4614 if (!res) {
4615 if (PrintMiscellaneous && Verbose) {
4616 DWORD err = GetLastError();
4617 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4618 }
4619 release_memory(base, bytes);
4620 CloseHandle(hFile);
4621 return NULL;
4622 }
4623 } else {
4624 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4625 NULL /*file_name*/);
4626 if (hMap == NULL) {
4627 if (PrintMiscellaneous && Verbose) {
4628 DWORD err = GetLastError();
4629 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4630 }
4631 CloseHandle(hFile);
4632 return NULL;
4633 }
4634
4635 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4636 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4637 (DWORD)bytes, addr);
4638 if (base == NULL) {
4639 if (PrintMiscellaneous && Verbose) {
4640 DWORD err = GetLastError();
4641 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4642 }
4643 CloseHandle(hMap);
4644 CloseHandle(hFile);
4645 return NULL;
4646 }
4647
4648 if (CloseHandle(hMap) == 0) {
4649 if (PrintMiscellaneous && Verbose) {
4650 DWORD err = GetLastError();
4651 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4652 }
4653 CloseHandle(hFile);
4654 return base;
4655 }
4656 }
4657
4658 if (allow_exec) {
4659 DWORD old_protect;
4660 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4661 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4662
4663 if (!res) {
4664 if (PrintMiscellaneous && Verbose) {
4665 DWORD err = GetLastError();
4666 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4667 }
4668 // Don't consider this a hard error, on IA32 even if the
4669 // VirtualProtect fails, we should still be able to execute
4670 CloseHandle(hFile);
4671 return base;
4672 }
4673 }
4674
4675 if (CloseHandle(hFile) == 0) {
4676 if (PrintMiscellaneous && Verbose) {
4677 DWORD err = GetLastError();
4678 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4679 }
4680 return base;
4681 }
4682
4683 return base;
4684 }
4685
4686
4687 // Remap a block of memory.
4688 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4689 char *addr, size_t bytes, bool read_only,
4690 bool allow_exec) {
4691 // This OS does not allow existing memory maps to be remapped so we
4692 // have to unmap the memory before we remap it.
4693 if (!os::unmap_memory(addr, bytes)) {
4694 return NULL;
4695 }
4696
4697 // There is a very small theoretical window between the unmap_memory()
4698 // call above and the map_memory() call below where a thread in native
4699 // code may be able to access an address that is no longer mapped.
4700
4701 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4702 read_only, allow_exec);
4703 }
4704
4705
4706 // Unmap a block of memory.
4707 // Returns true=success, otherwise false.
4708
4709 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4710 BOOL result = UnmapViewOfFile(addr);
4711 if (result == 0) {
4712 if (PrintMiscellaneous && Verbose) {
4713 DWORD err = GetLastError();
4714 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4715 }
4716 return false;
4717 }
4718 return true;
4719 }
4720
4721 void os::pause() {
4722 char filename[MAX_PATH];
4723 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4724 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4725 } else {
4726 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4727 }
4728
4729 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4730 if (fd != -1) {
4731 struct stat buf;
4732 ::close(fd);
4733 while (::stat(filename, &buf) == 0) {
4734 Sleep(100);
4735 }
4736 } else {
4737 jio_fprintf(stderr,
4738 "Could not open pause file '%s', continuing immediately.\n", filename);
4739 }
4740 }
4741
4742 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4743 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4744 }
4745
4746 /*
4747 * See the caveats for this class in os_windows.hpp
4748 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4749 * into this method and returns false. If no OS EXCEPTION was raised, returns
4750 * true.
4751 * The callback is supposed to provide the method that should be protected.
4752 */
4753 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4754 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4755 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4756 "crash_protection already set?");
4757
4758 bool success = true;
4759 __try {
4760 WatcherThread::watcher_thread()->set_crash_protection(this);
4761 cb.call();
4762 } __except(EXCEPTION_EXECUTE_HANDLER) {
4763 // only for protection, nothing to do
4764 success = false;
4765 }
4766 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4767 return success;
4768 }
4769
4770 // An Event wraps a win32 "CreateEvent" kernel handle.
4771 //
4772 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4773 //
4774 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4775 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4776 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4777 // In addition, an unpark() operation might fetch the handle field, but the
4778 // event could recycle between the fetch and the SetEvent() operation.
4779 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4780 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4781 // on an stale but recycled handle would be harmless, but in practice this might
4782 // confuse other non-Sun code, so it's not a viable approach.
4783 //
4784 // 2: Once a win32 event handle is associated with an Event, it remains associated
4785 // with the Event. The event handle is never closed. This could be construed
4786 // as handle leakage, but only up to the maximum # of threads that have been extant
4787 // at any one time. This shouldn't be an issue, as windows platforms typically
4788 // permit a process to have hundreds of thousands of open handles.
4789 //
4790 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4791 // and release unused handles.
4792 //
4793 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4794 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4795 //
4796 // 5. Use an RCU-like mechanism (Read-Copy Update).
4797 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4798 //
4799 // We use (2).
4800 //
4801 // TODO-FIXME:
4802 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4803 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4804 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4805 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4806 // into a single win32 CreateEvent() handle.
4807 //
4808 // _Event transitions in park()
4809 // -1 => -1 : illegal
4810 // 1 => 0 : pass - return immediately
4811 // 0 => -1 : block
4812 //
4813 // _Event serves as a restricted-range semaphore :
4814 // -1 : thread is blocked
4815 // 0 : neutral - thread is running or ready
4816 // 1 : signaled - thread is running or ready
4817 //
4818 // Another possible encoding of _Event would be
4819 // with explicit "PARKED" and "SIGNALED" bits.
4820
4821 int os::PlatformEvent::park (jlong Millis) {
4822 guarantee (_ParkHandle != NULL , "Invariant") ;
4823 guarantee (Millis > 0 , "Invariant") ;
4824 int v ;
4825
4826 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4827 // the initial park() operation.
4828
4829 for (;;) {
4830 v = _Event ;
4831 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4832 }
4833 guarantee ((v == 0) || (v == 1), "invariant") ;
4834 if (v != 0) return OS_OK ;
4835
4836 // Do this the hard way by blocking ...
4837 // TODO: consider a brief spin here, gated on the success of recent
4838 // spin attempts by this thread.
4839 //
4840 // We decompose long timeouts into series of shorter timed waits.
4841 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4842 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4843 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4844 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4845 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4846 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4847 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4848 // for the already waited time. This policy does not admit any new outcomes.
4849 // In the future, however, we might want to track the accumulated wait time and
4850 // adjust Millis accordingly if we encounter a spurious wakeup.
4851
4852 const int MAXTIMEOUT = 0x10000000 ;
4853 DWORD rv = WAIT_TIMEOUT ;
4854 while (_Event < 0 && Millis > 0) {
4855 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4856 if (Millis > MAXTIMEOUT) {
4857 prd = MAXTIMEOUT ;
4858 }
4859 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4860 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4861 if (rv == WAIT_TIMEOUT) {
4862 Millis -= prd ;
4863 }
4864 }
4865 v = _Event ;
4866 _Event = 0 ;
4867 // see comment at end of os::PlatformEvent::park() below:
4868 OrderAccess::fence() ;
4869 // If we encounter a nearly simultanous timeout expiry and unpark()
4870 // we return OS_OK indicating we awoke via unpark().
4871 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4872 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4873 }
4874
4875 void os::PlatformEvent::park () {
4876 guarantee (_ParkHandle != NULL, "Invariant") ;
4877 // Invariant: Only the thread associated with the Event/PlatformEvent
4878 // may call park().
4879 int v ;
4880 for (;;) {
4881 v = _Event ;
4882 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4883 }
4884 guarantee ((v == 0) || (v == 1), "invariant") ;
4885 if (v != 0) return ;
4886
4887 // Do this the hard way by blocking ...
4888 // TODO: consider a brief spin here, gated on the success of recent
4889 // spin attempts by this thread.
4890 while (_Event < 0) {
4891 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4892 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4893 }
4894
4895 // Usually we'll find _Event == 0 at this point, but as
4896 // an optional optimization we clear it, just in case can
4897 // multiple unpark() operations drove _Event up to 1.
4898 _Event = 0 ;
4899 OrderAccess::fence() ;
4900 guarantee (_Event >= 0, "invariant") ;
4901 }
4902
4903 void os::PlatformEvent::unpark() {
4904 guarantee (_ParkHandle != NULL, "Invariant") ;
4905
4906 // Transitions for _Event:
4907 // 0 :=> 1
4908 // 1 :=> 1
4909 // -1 :=> either 0 or 1; must signal target thread
4910 // That is, we can safely transition _Event from -1 to either
4911 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4912 // unpark() calls.
4913 // See also: "Semaphores in Plan 9" by Mullender & Cox
4914 //
4915 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4916 // that it will take two back-to-back park() calls for the owning
4917 // thread to block. This has the benefit of forcing a spurious return
4918 // from the first park() call after an unpark() call which will help
4919 // shake out uses of park() and unpark() without condition variables.
4920
4921 if (Atomic::xchg(1, &_Event) >= 0) return;
4922
4923 ::SetEvent(_ParkHandle);
4924 }
4925
4926
4927 // JSR166
4928 // -------------------------------------------------------
4929
4930 /*
4931 * The Windows implementation of Park is very straightforward: Basic
4932 * operations on Win32 Events turn out to have the right semantics to
4933 * use them directly. We opportunistically resuse the event inherited
4934 * from Monitor.
4935 */
4936
4937
4938 void Parker::park(bool isAbsolute, jlong time) {
4939 guarantee (_ParkEvent != NULL, "invariant") ;
4940 // First, demultiplex/decode time arguments
4941 if (time < 0) { // don't wait
4942 return;
4943 }
4944 else if (time == 0 && !isAbsolute) {
4945 time = INFINITE;
4946 }
4947 else if (isAbsolute) {
4948 time -= os::javaTimeMillis(); // convert to relative time
4949 if (time <= 0) // already elapsed
4950 return;
4951 }
4952 else { // relative
4953 time /= 1000000; // Must coarsen from nanos to millis
4954 if (time == 0) // Wait for the minimal time unit if zero
4955 time = 1;
4956 }
4957
4958 JavaThread* thread = (JavaThread*)(Thread::current());
4959 assert(thread->is_Java_thread(), "Must be JavaThread");
4960 JavaThread *jt = (JavaThread *)thread;
4961
4962 // Don't wait if interrupted or already triggered
4963 if (Thread::is_interrupted(thread, false) ||
4964 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4965 ResetEvent(_ParkEvent);
4966 return;
4967 }
4968 else {
4969 ThreadBlockInVM tbivm(jt);
4970 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4971 jt->set_suspend_equivalent();
4972
4973 WaitForSingleObject(_ParkEvent, time);
4974 ResetEvent(_ParkEvent);
4975
4976 // If externally suspended while waiting, re-suspend
4977 if (jt->handle_special_suspend_equivalent_condition()) {
4978 jt->java_suspend_self();
4979 }
4980 }
4981 }
4982
4983 void Parker::unpark() {
4984 guarantee (_ParkEvent != NULL, "invariant") ;
4985 SetEvent(_ParkEvent);
4986 }
4987
4988 // Run the specified command in a separate process. Return its exit value,
4989 // or -1 on failure (e.g. can't create a new process).
4990 int os::fork_and_exec(char* cmd) {
4991 STARTUPINFO si;
4992 PROCESS_INFORMATION pi;
4993
4994 memset(&si, 0, sizeof(si));
4995 si.cb = sizeof(si);
4996 memset(&pi, 0, sizeof(pi));
4997 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4998 cmd, // command line
4999 NULL, // process security attribute
5000 NULL, // thread security attribute
5001 TRUE, // inherits system handles
5002 0, // no creation flags
5003 NULL, // use parent's environment block
5004 NULL, // use parent's starting directory
5005 &si, // (in) startup information
5006 &pi); // (out) process information
5007
5008 if (rslt) {
5009 // Wait until child process exits.
5010 WaitForSingleObject(pi.hProcess, INFINITE);
5011
5012 DWORD exit_code;
5013 GetExitCodeProcess(pi.hProcess, &exit_code);
5014
5015 // Close process and thread handles.
5016 CloseHandle(pi.hProcess);
5017 CloseHandle(pi.hThread);
5018
5019 return (int)exit_code;
5020 } else {
5021 return -1;
5022 }
5023 }
5024
5025 //--------------------------------------------------------------------------------------------------
5026 // Non-product code
5027
5028 static int mallocDebugIntervalCounter = 0;
5029 static int mallocDebugCounter = 0;
5030 bool os::check_heap(bool force) {
5031 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5032 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5033 // Note: HeapValidate executes two hardware breakpoints when it finds something
5034 // wrong; at these points, eax contains the address of the offending block (I think).
5035 // To get to the exlicit error message(s) below, just continue twice.
5036 HANDLE heap = GetProcessHeap();
5037 { HeapLock(heap);
5038 PROCESS_HEAP_ENTRY phe;
5039 phe.lpData = NULL;
5040 while (HeapWalk(heap, &phe) != 0) {
5041 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5042 !HeapValidate(heap, 0, phe.lpData)) {
5043 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5044 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5045 fatal("corrupted C heap");
5046 }
5047 }
5048 DWORD err = GetLastError();
5049 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5050 fatal(err_msg("heap walk aborted with error %d", err));
5051 }
5052 HeapUnlock(heap);
5053 }
5054 mallocDebugIntervalCounter = 0;
5055 }
5056 return true;
5057 }
5058
5059
5060 bool os::find(address addr, outputStream* st) {
5061 // Nothing yet
5062 return false;
5063 }
5064
5065 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5066 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5067
5068 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5069 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5070 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5071 address addr = (address) exceptionRecord->ExceptionInformation[1];
5072
5073 if (os::is_memory_serialize_page(thread, addr))
5074 return EXCEPTION_CONTINUE_EXECUTION;
5075 }
5076
5077 return EXCEPTION_CONTINUE_SEARCH;
5078 }
5079
5080 // We don't build a headless jre for Windows
5081 bool os::is_headless_jre() { return false; }
5082
5083 static jint initSock() {
5084 WSADATA wsadata;
5085
5086 if (!os::WinSock2Dll::WinSock2Available()) {
5087 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5088 ::GetLastError());
5089 return JNI_ERR;
5090 }
5091
5092 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5093 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5094 ::GetLastError());
5095 return JNI_ERR;
5096 }
5097 return JNI_OK;
5098 }
5099
5100 struct hostent* os::get_host_by_name(char* name) {
5101 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5102 }
5103
5104 int os::socket_close(int fd) {
5105 return ::closesocket(fd);
5106 }
5107
5108 int os::socket_available(int fd, jint *pbytes) {
5109 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5110 return (ret < 0) ? 0 : 1;
5111 }
5112
5113 int os::socket(int domain, int type, int protocol) {
5114 return ::socket(domain, type, protocol);
5115 }
5116
5117 int os::listen(int fd, int count) {
5118 return ::listen(fd, count);
5119 }
5120
5121 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5122 return ::connect(fd, him, len);
5123 }
5124
5125 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5126 return ::accept(fd, him, len);
5127 }
5128
5129 int os::sendto(int fd, char* buf, size_t len, uint flags,
5130 struct sockaddr* to, socklen_t tolen) {
5131
5132 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5133 }
5134
5135 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5136 sockaddr* from, socklen_t* fromlen) {
5137
5138 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5139 }
5140
5141 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5142 return ::recv(fd, buf, (int)nBytes, flags);
5143 }
5144
5145 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5146 return ::send(fd, buf, (int)nBytes, flags);
5147 }
5148
5149 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5150 return ::send(fd, buf, (int)nBytes, flags);
5151 }
5152
5153 int os::timeout(int fd, long timeout) {
5154 fd_set tbl;
5155 struct timeval t;
5156
5157 t.tv_sec = timeout / 1000;
5158 t.tv_usec = (timeout % 1000) * 1000;
5159
5160 tbl.fd_count = 1;
5161 tbl.fd_array[0] = fd;
5162
5163 return ::select(1, &tbl, 0, 0, &t);
5164 }
5165
5166 int os::get_host_name(char* name, int namelen) {
5167 return ::gethostname(name, namelen);
5168 }
5169
5170 int os::socket_shutdown(int fd, int howto) {
5171 return ::shutdown(fd, howto);
5172 }
5173
5174 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5175 return ::bind(fd, him, len);
5176 }
5177
5178 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5179 return ::getsockname(fd, him, len);
5180 }
5181
5182 int os::get_sock_opt(int fd, int level, int optname,
5183 char* optval, socklen_t* optlen) {
5184 return ::getsockopt(fd, level, optname, optval, optlen);
5185 }
5186
5187 int os::set_sock_opt(int fd, int level, int optname,
5188 const char* optval, socklen_t optlen) {
5189 return ::setsockopt(fd, level, optname, optval, optlen);
5190 }
5191
5192 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5193 #if defined(IA32)
5194 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5195 #elif defined (AMD64)
5196 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5197 #endif
5198
5199 // returns true if thread could be suspended,
5200 // false otherwise
5201 static bool do_suspend(HANDLE* h) {
5202 if (h != NULL) {
5203 if (SuspendThread(*h) != ~0) {
5204 return true;
5205 }
5206 }
5207 return false;
5208 }
5209
5210 // resume the thread
5211 // calling resume on an active thread is a no-op
5212 static void do_resume(HANDLE* h) {
5213 if (h != NULL) {
5214 ResumeThread(*h);
5215 }
5216 }
5217
5218 // retrieve a suspend/resume context capable handle
5219 // from the tid. Caller validates handle return value.
5220 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5221 if (h != NULL) {
5222 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5223 }
5224 }
5225
5226 //
5227 // Thread sampling implementation
5228 //
5229 void os::SuspendedThreadTask::internal_do_task() {
5230 CONTEXT ctxt;
5231 HANDLE h = NULL;
5232
5233 // get context capable handle for thread
5234 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5235
5236 // sanity
5237 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5238 return;
5239 }
5240
5241 // suspend the thread
5242 if (do_suspend(&h)) {
5243 ctxt.ContextFlags = sampling_context_flags;
5244 // get thread context
5245 GetThreadContext(h, &ctxt);
5246 SuspendedThreadTaskContext context(_thread, &ctxt);
5247 // pass context to Thread Sampling impl
5248 do_task(context);
5249 // resume thread
5250 do_resume(&h);
5251 }
5252
5253 // close handle
5254 CloseHandle(h);
5255 }
5256
5257
5258 // Kernel32 API
5259 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5260 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5261 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5262 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5263 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5264
5265 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5266 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5267 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5268 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5269 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5270
5271
5272 BOOL os::Kernel32Dll::initialized = FALSE;
5273 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5274 assert(initialized && _GetLargePageMinimum != NULL,
5275 "GetLargePageMinimumAvailable() not yet called");
5276 return _GetLargePageMinimum();
5277 }
5278
5279 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5280 if (!initialized) {
5281 initialize();
5282 }
5283 return _GetLargePageMinimum != NULL;
5284 }
5285
5286 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5287 if (!initialized) {
5288 initialize();
5289 }
5290 return _VirtualAllocExNuma != NULL;
5291 }
5292
5293 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5294 assert(initialized && _VirtualAllocExNuma != NULL,
5295 "NUMACallsAvailable() not yet called");
5296
5297 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5298 }
5299
5300 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5301 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5302 "NUMACallsAvailable() not yet called");
5303
5304 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5305 }
5306
5307 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5308 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5309 "NUMACallsAvailable() not yet called");
5310
5311 return _GetNumaNodeProcessorMask(node, proc_mask);
5312 }
5313
5314 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5315 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5316 if (!initialized) {
5317 initialize();
5318 }
5319
5320 if (_RtlCaptureStackBackTrace != NULL) {
5321 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5322 BackTrace, BackTraceHash);
5323 } else {
5324 return 0;
5325 }
5326 }
5327
5328 void os::Kernel32Dll::initializeCommon() {
5329 if (!initialized) {
5330 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5331 assert(handle != NULL, "Just check");
5332 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5333 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5334 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5335 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5336 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5337 initialized = TRUE;
5338 }
5339 }
5340
5341
5342
5343 #ifndef JDK6_OR_EARLIER
5344
5345 void os::Kernel32Dll::initialize() {
5346 initializeCommon();
5347 }
5348
5349
5350 // Kernel32 API
5351 inline BOOL os::Kernel32Dll::SwitchToThread() {
5352 return ::SwitchToThread();
5353 }
5354
5355 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5356 return true;
5357 }
5358
5359 // Help tools
5360 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5361 return true;
5362 }
5363
5364 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5365 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5366 }
5367
5368 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5369 return ::Module32First(hSnapshot, lpme);
5370 }
5371
5372 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5373 return ::Module32Next(hSnapshot, lpme);
5374 }
5375
5376 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5377 ::GetNativeSystemInfo(lpSystemInfo);
5378 }
5379
5380 // PSAPI API
5381 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5382 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5383 }
5384
5385 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5386 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5387 }
5388
5389 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5390 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5391 }
5392
5393 inline BOOL os::PSApiDll::PSApiAvailable() {
5394 return true;
5395 }
5396
5397
5398 // WinSock2 API
5399 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5400 return ::WSAStartup(wVersionRequested, lpWSAData);
5401 }
5402
5403 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5404 return ::gethostbyname(name);
5405 }
5406
5407 inline BOOL os::WinSock2Dll::WinSock2Available() {
5408 return true;
5409 }
5410
5411 // Advapi API
5412 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5413 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5414 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5415 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5416 BufferLength, PreviousState, ReturnLength);
5417 }
5418
5419 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5420 PHANDLE TokenHandle) {
5421 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5422 }
5423
5424 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5425 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5426 }
5427
5428 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5429 return true;
5430 }
5431
5432 void* os::get_default_process_handle() {
5433 return (void*)GetModuleHandle(NULL);
5434 }
5435
5436 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5437 // which is used to find statically linked in agents.
5438 // Additionally for windows, takes into account __stdcall names.
5439 // Parameters:
5440 // sym_name: Symbol in library we are looking for
5441 // lib_name: Name of library to look in, NULL for shared libs.
5442 // is_absolute_path == true if lib_name is absolute path to agent
5443 // such as "C:/a/b/L.dll"
5444 // == false if only the base name of the library is passed in
5445 // such as "L"
5446 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5447 bool is_absolute_path) {
5448 char *agent_entry_name;
5449 size_t len;
5450 size_t name_len;
5451 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5452 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5453 const char *start;
5454
5455 if (lib_name != NULL) {
5456 len = name_len = strlen(lib_name);
5457 if (is_absolute_path) {
5458 // Need to strip path, prefix and suffix
5459 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5460 lib_name = ++start;
5461 } else {
5462 // Need to check for drive prefix
5463 if ((start = strchr(lib_name, ':')) != NULL) {
5464 lib_name = ++start;
5465 }
5466 }
5467 if (len <= (prefix_len + suffix_len)) {
5468 return NULL;
5469 }
5470 lib_name += prefix_len;
5471 name_len = strlen(lib_name) - suffix_len;
5472 }
5473 }
5474 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5475 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5476 if (agent_entry_name == NULL) {
5477 return NULL;
5478 }
5479 if (lib_name != NULL) {
5480 const char *p = strrchr(sym_name, '@');
5481 if (p != NULL && p != sym_name) {
5482 // sym_name == _Agent_OnLoad@XX
5483 strncpy(agent_entry_name, sym_name, (p - sym_name));
5484 agent_entry_name[(p-sym_name)] = '\0';
5485 // agent_entry_name == _Agent_OnLoad
5486 strcat(agent_entry_name, "_");
5487 strncat(agent_entry_name, lib_name, name_len);
5488 strcat(agent_entry_name, p);
5489 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5490 } else {
5491 strcpy(agent_entry_name, sym_name);
5492 strcat(agent_entry_name, "_");
5493 strncat(agent_entry_name, lib_name, name_len);
5494 }
5495 } else {
5496 strcpy(agent_entry_name, sym_name);
5497 }
5498 return agent_entry_name;
5499 }
5500
5501 #else
5502 // Kernel32 API
5503 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5504 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5505 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5506 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5507 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5508
5509 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5510 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5511 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5512 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5513 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5514
5515 void os::Kernel32Dll::initialize() {
5516 if (!initialized) {
5517 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5518 assert(handle != NULL, "Just check");
5519
5520 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5521 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5522 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5523 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5524 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5525 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5526 initializeCommon(); // resolve the functions that always need resolving
5527
5528 initialized = TRUE;
5529 }
5530 }
5531
5532 BOOL os::Kernel32Dll::SwitchToThread() {
5533 assert(initialized && _SwitchToThread != NULL,
5534 "SwitchToThreadAvailable() not yet called");
5535 return _SwitchToThread();
5536 }
5537
5538
5539 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5540 if (!initialized) {
5541 initialize();
5542 }
5543 return _SwitchToThread != NULL;
5544 }
5545
5546 // Help tools
5547 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5548 if (!initialized) {
5549 initialize();
5550 }
5551 return _CreateToolhelp32Snapshot != NULL &&
5552 _Module32First != NULL &&
5553 _Module32Next != NULL;
5554 }
5555
5556 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5557 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5558 "HelpToolsAvailable() not yet called");
5559
5560 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5561 }
5562
5563 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5564 assert(initialized && _Module32First != NULL,
5565 "HelpToolsAvailable() not yet called");
5566
5567 return _Module32First(hSnapshot, lpme);
5568 }
5569
5570 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5571 assert(initialized && _Module32Next != NULL,
5572 "HelpToolsAvailable() not yet called");
5573
5574 return _Module32Next(hSnapshot, lpme);
5575 }
5576
5577
5578 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5579 if (!initialized) {
5580 initialize();
5581 }
5582 return _GetNativeSystemInfo != NULL;
5583 }
5584
5585 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5586 assert(initialized && _GetNativeSystemInfo != NULL,
5587 "GetNativeSystemInfoAvailable() not yet called");
5588
5589 _GetNativeSystemInfo(lpSystemInfo);
5590 }
5591
5592 // PSAPI API
5593
5594
5595 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5596 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5597 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5598
5599 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5600 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5601 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5602 BOOL os::PSApiDll::initialized = FALSE;
5603
5604 void os::PSApiDll::initialize() {
5605 if (!initialized) {
5606 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5607 if (handle != NULL) {
5608 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5609 "EnumProcessModules");
5610 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5611 "GetModuleFileNameExA");
5612 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5613 "GetModuleInformation");
5614 }
5615 initialized = TRUE;
5616 }
5617 }
5618
5619
5620
5621 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5622 assert(initialized && _EnumProcessModules != NULL,
5623 "PSApiAvailable() not yet called");
5624 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5625 }
5626
5627 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5628 assert(initialized && _GetModuleFileNameEx != NULL,
5629 "PSApiAvailable() not yet called");
5630 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5631 }
5632
5633 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5634 assert(initialized && _GetModuleInformation != NULL,
5635 "PSApiAvailable() not yet called");
5636 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5637 }
5638
5639 BOOL os::PSApiDll::PSApiAvailable() {
5640 if (!initialized) {
5641 initialize();
5642 }
5643 return _EnumProcessModules != NULL &&
5644 _GetModuleFileNameEx != NULL &&
5645 _GetModuleInformation != NULL;
5646 }
5647
5648
5649 // WinSock2 API
5650 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5651 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5652
5653 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5654 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5655 BOOL os::WinSock2Dll::initialized = FALSE;
5656
5657 void os::WinSock2Dll::initialize() {
5658 if (!initialized) {
5659 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5660 if (handle != NULL) {
5661 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5662 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5663 }
5664 initialized = TRUE;
5665 }
5666 }
5667
5668
5669 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5670 assert(initialized && _WSAStartup != NULL,
5671 "WinSock2Available() not yet called");
5672 return _WSAStartup(wVersionRequested, lpWSAData);
5673 }
5674
5675 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5676 assert(initialized && _gethostbyname != NULL,
5677 "WinSock2Available() not yet called");
5678 return _gethostbyname(name);
5679 }
5680
5681 BOOL os::WinSock2Dll::WinSock2Available() {
5682 if (!initialized) {
5683 initialize();
5684 }
5685 return _WSAStartup != NULL &&
5686 _gethostbyname != NULL;
5687 }
5688
5689 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5690 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5691 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5692
5693 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5694 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5695 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5696 BOOL os::Advapi32Dll::initialized = FALSE;
5697
5698 void os::Advapi32Dll::initialize() {
5699 if (!initialized) {
5700 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5701 if (handle != NULL) {
5702 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5703 "AdjustTokenPrivileges");
5704 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5705 "OpenProcessToken");
5706 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5707 "LookupPrivilegeValueA");
5708 }
5709 initialized = TRUE;
5710 }
5711 }
5712
5713 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5714 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5715 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5716 assert(initialized && _AdjustTokenPrivileges != NULL,
5717 "AdvapiAvailable() not yet called");
5718 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5719 BufferLength, PreviousState, ReturnLength);
5720 }
5721
5722 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5723 PHANDLE TokenHandle) {
5724 assert(initialized && _OpenProcessToken != NULL,
5725 "AdvapiAvailable() not yet called");
5726 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5727 }
5728
5729 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5730 assert(initialized && _LookupPrivilegeValue != NULL,
5731 "AdvapiAvailable() not yet called");
5732 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5733 }
5734
5735 BOOL os::Advapi32Dll::AdvapiAvailable() {
5736 if (!initialized) {
5737 initialize();
5738 }
5739 return _AdjustTokenPrivileges != NULL &&
5740 _OpenProcessToken != NULL &&
5741 _LookupPrivilegeValue != NULL;
5742 }
5743
5744 #endif
5745
5746 #ifndef PRODUCT
5747
5748 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5749 // contiguous memory block at a particular address.
5750 // The test first tries to find a good approximate address to allocate at by using the same
5751 // method to allocate some memory at any address. The test then tries to allocate memory in
5752 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5753 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5754 // the previously allocated memory is available for allocation. The only actual failure
5755 // that is reported is when the test tries to allocate at a particular location but gets a
5756 // different valid one. A NULL return value at this point is not considered an error but may
5757 // be legitimate.
5758 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5759 void TestReserveMemorySpecial_test() {
5760 if (!UseLargePages) {
5761 if (VerboseInternalVMTests) {
5762 gclog_or_tty->print("Skipping test because large pages are disabled");
5763 }
5764 return;
5765 }
5766 // save current value of globals
5767 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5768 bool old_use_numa_interleaving = UseNUMAInterleaving;
5769
5770 // set globals to make sure we hit the correct code path
5771 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5772
5773 // do an allocation at an address selected by the OS to get a good one.
5774 const size_t large_allocation_size = os::large_page_size() * 4;
5775 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5776 if (result == NULL) {
5777 if (VerboseInternalVMTests) {
5778 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5779 large_allocation_size);
5780 }
5781 } else {
5782 os::release_memory_special(result, large_allocation_size);
5783
5784 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5785 // we managed to get it once.
5786 const size_t expected_allocation_size = os::large_page_size();
5787 char* expected_location = result + os::large_page_size();
5788 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5789 if (actual_location == NULL) {
5790 if (VerboseInternalVMTests) {
5791 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5792 expected_location, large_allocation_size);
5793 }
5794 } else {
5795 // release memory
5796 os::release_memory_special(actual_location, expected_allocation_size);
5797 // only now check, after releasing any memory to avoid any leaks.
5798 assert(actual_location == expected_location,
5799 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5800 expected_location, expected_allocation_size, actual_location));
5801 }
5802 }
5803
5804 // restore globals
5805 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5806 UseNUMAInterleaving = old_use_numa_interleaving;
5807 }
5808 #endif // PRODUCT
5809