1 /*
2 * Copyright (c) 1997, 2012, 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/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/runtimeService.hpp"
64 #include "utilities/decoder.hpp"
65 #include "utilities/defaultStream.hpp"
66 #include "utilities/events.hpp"
67 #include "utilities/growableArray.hpp"
68 #include "utilities/vmError.hpp"
69
70 #ifdef _DEBUG
71 #include <crtdbg.h>
72 #endif
73
74
75 #include <windows.h>
76 #include <sys/types.h>
77 #include <sys/stat.h>
78 #include <sys/timeb.h>
79 #include <objidl.h>
80 #include <shlobj.h>
81
82 #include <malloc.h>
83 #include <signal.h>
84 #include <direct.h>
85 #include <errno.h>
86 #include <fcntl.h>
87 #include <io.h>
88 #include <process.h> // For _beginthreadex(), _endthreadex()
89 #include <imagehlp.h> // For os::dll_address_to_function_name
90 /* for enumerating dll libraries */
91 #include <vdmdbg.h>
92
93 // for timer info max values which include all bits
94 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
95
96 // For DLL loading/load error detection
97 // Values of PE COFF
98 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
99 #define IMAGE_FILE_SIGNATURE_LENGTH 4
100
101 static HANDLE main_process;
102 static HANDLE main_thread;
103 static int main_thread_id;
104
105 static FILETIME process_creation_time;
106 static FILETIME process_exit_time;
107 static FILETIME process_user_time;
108 static FILETIME process_kernel_time;
109
110 #ifdef _M_IA64
111 #define __CPU__ ia64
112 #elif _M_AMD64
113 #define __CPU__ amd64
114 #else
115 #define __CPU__ i486
116 #endif
117
118 // save DLL module handle, used by GetModuleFileName
119
120 HINSTANCE vm_lib_handle;
121
122 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
123 switch (reason) {
124 case DLL_PROCESS_ATTACH:
125 vm_lib_handle = hinst;
126 if(ForceTimeHighResolution)
127 timeBeginPeriod(1L);
128 break;
129 case DLL_PROCESS_DETACH:
130 if(ForceTimeHighResolution)
131 timeEndPeriod(1L);
132 break;
133 default:
134 break;
135 }
136 return true;
137 }
138
139 static inline double fileTimeAsDouble(FILETIME* time) {
140 const double high = (double) ((unsigned int) ~0);
141 const double split = 10000000.0;
142 double result = (time->dwLowDateTime / split) +
143 time->dwHighDateTime * (high/split);
144 return result;
145 }
146
147 // Implementation of os
148
149 bool os::getenv(const char* name, char* buffer, int len) {
150 int result = GetEnvironmentVariable(name, buffer, len);
151 return result > 0 && result < len;
152 }
153
154
155 // No setuid programs under Windows.
156 bool os::have_special_privileges() {
157 return false;
158 }
159
160
161 // This method is a periodic task to check for misbehaving JNI applications
162 // under CheckJNI, we can add any periodic checks here.
163 // For Windows at the moment does nothing
164 void os::run_periodic_checks() {
165 return;
166 }
167
168 #ifndef _WIN64
169 // previous UnhandledExceptionFilter, if there is one
170 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
171
172 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
173 #endif
174 void os::init_system_properties_values() {
175 /* sysclasspath, java_home, dll_dir */
176 {
177 char *home_path;
178 char *dll_path;
179 char *pslash;
180 char *bin = "\\bin";
181 char home_dir[MAX_PATH];
182
183 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
184 os::jvm_path(home_dir, sizeof(home_dir));
185 // Found the full path to jvm[_g].dll.
186 // Now cut the path to <java_home>/jre if we can.
187 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
188 pslash = strrchr(home_dir, '\\');
189 if (pslash != NULL) {
190 *pslash = '\0'; /* get rid of \{client|server} */
191 pslash = strrchr(home_dir, '\\');
192 if (pslash != NULL)
193 *pslash = '\0'; /* get rid of \bin */
194 }
195 }
196
197 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
198 if (home_path == NULL)
199 return;
200 strcpy(home_path, home_dir);
201 Arguments::set_java_home(home_path);
202
203 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
204 if (dll_path == NULL)
205 return;
206 strcpy(dll_path, home_dir);
207 strcat(dll_path, bin);
208 Arguments::set_dll_dir(dll_path);
209
210 if (!set_boot_path('\\', ';'))
211 return;
212 }
213
214 /* library_path */
215 #define EXT_DIR "\\lib\\ext"
216 #define BIN_DIR "\\bin"
217 #define PACKAGE_DIR "\\Sun\\Java"
218 {
219 /* Win32 library search order (See the documentation for LoadLibrary):
220 *
221 * 1. The directory from which application is loaded.
222 * 2. The system wide Java Extensions directory (Java only)
223 * 3. System directory (GetSystemDirectory)
224 * 4. Windows directory (GetWindowsDirectory)
225 * 5. The PATH environment variable
226 * 6. The current directory
227 */
228
229 char *library_path;
230 char tmp[MAX_PATH];
231 char *path_str = ::getenv("PATH");
232
233 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
234 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
235
236 library_path[0] = '\0';
237
238 GetModuleFileName(NULL, tmp, sizeof(tmp));
239 *(strrchr(tmp, '\\')) = '\0';
240 strcat(library_path, tmp);
241
242 GetWindowsDirectory(tmp, sizeof(tmp));
243 strcat(library_path, ";");
244 strcat(library_path, tmp);
245 strcat(library_path, PACKAGE_DIR BIN_DIR);
246
247 GetSystemDirectory(tmp, sizeof(tmp));
248 strcat(library_path, ";");
249 strcat(library_path, tmp);
250
251 GetWindowsDirectory(tmp, sizeof(tmp));
252 strcat(library_path, ";");
253 strcat(library_path, tmp);
254
255 if (path_str) {
256 strcat(library_path, ";");
257 strcat(library_path, path_str);
258 }
259
260 strcat(library_path, ";.");
261
262 Arguments::set_library_path(library_path);
263 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
264 }
265
266 /* Default extensions directory */
267 {
268 char path[MAX_PATH];
269 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
270 GetWindowsDirectory(path, MAX_PATH);
271 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
272 path, PACKAGE_DIR, EXT_DIR);
273 Arguments::set_ext_dirs(buf);
274 }
275 #undef EXT_DIR
276 #undef BIN_DIR
277 #undef PACKAGE_DIR
278
279 /* Default endorsed standards directory. */
280 {
281 #define ENDORSED_DIR "\\lib\\endorsed"
282 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
283 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
284 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
285 Arguments::set_endorsed_dirs(buf);
286 #undef ENDORSED_DIR
287 }
288
289 #ifndef _WIN64
290 // set our UnhandledExceptionFilter and save any previous one
291 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
292 #endif
293
294 // Done
295 return;
296 }
297
298 void os::breakpoint() {
299 DebugBreak();
300 }
301
302 // Invoked from the BREAKPOINT Macro
303 extern "C" void breakpoint() {
304 os::breakpoint();
305 }
306
307 /*
308 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
309 * So far, this method is only used by Native Memory Tracking, which is
310 * only supported on Windows XP or later.
311 */
312 address os::get_caller_pc(int n) {
313 #ifdef _NMT_NOINLINE_
314 n ++;
315 #endif
316 address pc;
317 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
318 return pc;
319 }
320 return NULL;
321 }
322
323
324 // os::current_stack_base()
325 //
326 // Returns the base of the stack, which is the stack's
327 // starting address. This function must be called
328 // while running on the stack of the thread being queried.
329
330 address os::current_stack_base() {
331 MEMORY_BASIC_INFORMATION minfo;
332 address stack_bottom;
333 size_t stack_size;
334
335 VirtualQuery(&minfo, &minfo, sizeof(minfo));
336 stack_bottom = (address)minfo.AllocationBase;
337 stack_size = minfo.RegionSize;
338
339 // Add up the sizes of all the regions with the same
340 // AllocationBase.
341 while( 1 )
342 {
343 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
344 if ( stack_bottom == (address)minfo.AllocationBase )
345 stack_size += minfo.RegionSize;
346 else
347 break;
348 }
349
350 #ifdef _M_IA64
351 // IA64 has memory and register stacks
352 stack_size = stack_size / 2;
353 #endif
354 return stack_bottom + stack_size;
355 }
356
357 size_t os::current_stack_size() {
358 size_t sz;
359 MEMORY_BASIC_INFORMATION minfo;
360 VirtualQuery(&minfo, &minfo, sizeof(minfo));
361 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
362 return sz;
363 }
364
365 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
366 const struct tm* time_struct_ptr = localtime(clock);
367 if (time_struct_ptr != NULL) {
368 *res = *time_struct_ptr;
369 return res;
370 }
371 return NULL;
372 }
373
374 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
375
376 // Thread start routine for all new Java threads
377 static unsigned __stdcall java_start(Thread* thread) {
378 // Try to randomize the cache line index of hot stack frames.
379 // This helps when threads of the same stack traces evict each other's
380 // cache lines. The threads can be either from the same JVM instance, or
381 // from different JVM instances. The benefit is especially true for
382 // processors with hyperthreading technology.
383 static int counter = 0;
384 int pid = os::current_process_id();
385 _alloca(((pid ^ counter++) & 7) * 128);
386
387 OSThread* osthr = thread->osthread();
388 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
389
390 if (UseNUMA) {
391 int lgrp_id = os::numa_get_group_id();
392 if (lgrp_id != -1) {
393 thread->set_lgrp_id(lgrp_id);
394 }
395 }
396
397
398 // Install a win32 structured exception handler around every thread created
399 // by VM, so VM can genrate error dump when an exception occurred in non-
400 // Java thread (e.g. VM thread).
401 __try {
402 thread->run();
403 } __except(topLevelExceptionFilter(
404 (_EXCEPTION_POINTERS*)_exception_info())) {
405 // Nothing to do.
406 }
407
408 // One less thread is executing
409 // When the VMThread gets here, the main thread may have already exited
410 // which frees the CodeHeap containing the Atomic::add code
411 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
412 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
413 }
414
415 return 0;
416 }
417
418 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
419 // Allocate the OSThread object
420 OSThread* osthread = new OSThread(NULL, NULL);
421 if (osthread == NULL) return NULL;
422
423 // Initialize support for Java interrupts
424 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
425 if (interrupt_event == NULL) {
426 delete osthread;
427 return NULL;
428 }
429 osthread->set_interrupt_event(interrupt_event);
430
431 // Store info on the Win32 thread into the OSThread
432 osthread->set_thread_handle(thread_handle);
433 osthread->set_thread_id(thread_id);
434
435 if (UseNUMA) {
436 int lgrp_id = os::numa_get_group_id();
437 if (lgrp_id != -1) {
438 thread->set_lgrp_id(lgrp_id);
439 }
440 }
441
442 // Initial thread state is INITIALIZED, not SUSPENDED
443 osthread->set_state(INITIALIZED);
444
445 return osthread;
446 }
447
448
449 bool os::create_attached_thread(JavaThread* thread) {
450 #ifdef ASSERT
451 thread->verify_not_published();
452 #endif
453 HANDLE thread_h;
454 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
455 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
456 fatal("DuplicateHandle failed\n");
457 }
458 OSThread* osthread = create_os_thread(thread, thread_h,
459 (int)current_thread_id());
460 if (osthread == NULL) {
461 return false;
462 }
463
464 // Initial thread state is RUNNABLE
465 osthread->set_state(RUNNABLE);
466
467 thread->set_osthread(osthread);
468 return true;
469 }
470
471 bool os::create_main_thread(JavaThread* thread) {
472 #ifdef ASSERT
473 thread->verify_not_published();
474 #endif
475 if (_starting_thread == NULL) {
476 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
477 if (_starting_thread == NULL) {
478 return false;
479 }
480 }
481
482 // The primordial thread is runnable from the start)
483 _starting_thread->set_state(RUNNABLE);
484
485 thread->set_osthread(_starting_thread);
486 return true;
487 }
488
489 // Allocate and initialize a new OSThread
490 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
491 unsigned thread_id;
492
493 // Allocate the OSThread object
494 OSThread* osthread = new OSThread(NULL, NULL);
495 if (osthread == NULL) {
496 return false;
497 }
498
499 // Initialize support for Java interrupts
500 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
501 if (interrupt_event == NULL) {
502 delete osthread;
503 return NULL;
504 }
505 osthread->set_interrupt_event(interrupt_event);
506 osthread->set_interrupted(false);
507
508 thread->set_osthread(osthread);
509
510 if (stack_size == 0) {
511 switch (thr_type) {
512 case os::java_thread:
513 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
514 if (JavaThread::stack_size_at_create() > 0)
515 stack_size = JavaThread::stack_size_at_create();
516 break;
517 case os::compiler_thread:
518 if (CompilerThreadStackSize > 0) {
519 stack_size = (size_t)(CompilerThreadStackSize * K);
520 break;
521 } // else fall through:
522 // use VMThreadStackSize if CompilerThreadStackSize is not defined
523 case os::vm_thread:
524 case os::pgc_thread:
525 case os::cgc_thread:
526 case os::watcher_thread:
527 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
528 break;
529 }
530 }
531
532 // Create the Win32 thread
533 //
534 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
535 // does not specify stack size. Instead, it specifies the size of
536 // initially committed space. The stack size is determined by
537 // PE header in the executable. If the committed "stack_size" is larger
538 // than default value in the PE header, the stack is rounded up to the
539 // nearest multiple of 1MB. For example if the launcher has default
540 // stack size of 320k, specifying any size less than 320k does not
541 // affect the actual stack size at all, it only affects the initial
542 // commitment. On the other hand, specifying 'stack_size' larger than
543 // default value may cause significant increase in memory usage, because
544 // not only the stack space will be rounded up to MB, but also the
545 // entire space is committed upfront.
546 //
547 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
548 // for CreateThread() that can treat 'stack_size' as stack size. However we
549 // are not supposed to call CreateThread() directly according to MSDN
550 // document because JVM uses C runtime library. The good news is that the
551 // flag appears to work with _beginthredex() as well.
552
553 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
554 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
555 #endif
556
557 HANDLE thread_handle =
558 (HANDLE)_beginthreadex(NULL,
559 (unsigned)stack_size,
560 (unsigned (__stdcall *)(void*)) java_start,
561 thread,
562 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
563 &thread_id);
564 if (thread_handle == NULL) {
565 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
566 // without the flag.
567 thread_handle =
568 (HANDLE)_beginthreadex(NULL,
569 (unsigned)stack_size,
570 (unsigned (__stdcall *)(void*)) java_start,
571 thread,
572 CREATE_SUSPENDED,
573 &thread_id);
574 }
575 if (thread_handle == NULL) {
576 // Need to clean up stuff we've allocated so far
577 CloseHandle(osthread->interrupt_event());
578 thread->set_osthread(NULL);
579 delete osthread;
580 return NULL;
581 }
582
583 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
584
585 // Store info on the Win32 thread into the OSThread
586 osthread->set_thread_handle(thread_handle);
587 osthread->set_thread_id(thread_id);
588
589 // Initial thread state is INITIALIZED, not SUSPENDED
590 osthread->set_state(INITIALIZED);
591
592 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
593 return true;
594 }
595
596
597 // Free Win32 resources related to the OSThread
598 void os::free_thread(OSThread* osthread) {
599 assert(osthread != NULL, "osthread not set");
600 CloseHandle(osthread->thread_handle());
601 CloseHandle(osthread->interrupt_event());
602 delete osthread;
603 }
604
605
606 static int has_performance_count = 0;
607 static jlong first_filetime;
608 static jlong initial_performance_count;
609 static jlong performance_frequency;
610
611
612 jlong as_long(LARGE_INTEGER x) {
613 jlong result = 0; // initialization to avoid warning
614 set_high(&result, x.HighPart);
615 set_low(&result, x.LowPart);
616 return result;
617 }
618
619
620 jlong os::elapsed_counter() {
621 LARGE_INTEGER count;
622 if (has_performance_count) {
623 QueryPerformanceCounter(&count);
624 return as_long(count) - initial_performance_count;
625 } else {
626 FILETIME wt;
627 GetSystemTimeAsFileTime(&wt);
628 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
629 }
630 }
631
632
633 jlong os::elapsed_frequency() {
634 if (has_performance_count) {
635 return performance_frequency;
636 } else {
637 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
638 return 10000000;
639 }
640 }
641
642
643 julong os::available_memory() {
644 return win32::available_memory();
645 }
646
647 julong os::win32::available_memory() {
648 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
649 // value if total memory is larger than 4GB
650 MEMORYSTATUSEX ms;
651 ms.dwLength = sizeof(ms);
652 GlobalMemoryStatusEx(&ms);
653
654 return (julong)ms.ullAvailPhys;
655 }
656
657 julong os::physical_memory() {
658 return win32::physical_memory();
659 }
660
661 julong os::allocatable_physical_memory(julong size) {
662 #ifdef _LP64
663 return size;
664 #else
665 // Limit to 1400m because of the 2gb address space wall
666 return MIN2(size, (julong)1400*M);
667 #endif
668 }
669
670 // VC6 lacks DWORD_PTR
671 #if _MSC_VER < 1300
672 typedef UINT_PTR DWORD_PTR;
673 #endif
674
675 int os::active_processor_count() {
676 DWORD_PTR lpProcessAffinityMask = 0;
677 DWORD_PTR lpSystemAffinityMask = 0;
678 int proc_count = processor_count();
679 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
680 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
681 // Nof active processors is number of bits in process affinity mask
682 int bitcount = 0;
683 while (lpProcessAffinityMask != 0) {
684 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
685 bitcount++;
686 }
687 return bitcount;
688 } else {
689 return proc_count;
690 }
691 }
692
693 void os::set_native_thread_name(const char *name) {
694 // Not yet implemented.
695 return;
696 }
697
698 bool os::distribute_processes(uint length, uint* distribution) {
699 // Not yet implemented.
700 return false;
701 }
702
703 bool os::bind_to_processor(uint processor_id) {
704 // Not yet implemented.
705 return false;
706 }
707
708 static void initialize_performance_counter() {
709 LARGE_INTEGER count;
710 if (QueryPerformanceFrequency(&count)) {
711 has_performance_count = 1;
712 performance_frequency = as_long(count);
713 QueryPerformanceCounter(&count);
714 initial_performance_count = as_long(count);
715 } else {
716 has_performance_count = 0;
717 FILETIME wt;
718 GetSystemTimeAsFileTime(&wt);
719 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
720 }
721 }
722
723
724 double os::elapsedTime() {
725 return (double) elapsed_counter() / (double) elapsed_frequency();
726 }
727
728
729 // Windows format:
730 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
731 // Java format:
732 // Java standards require the number of milliseconds since 1/1/1970
733
734 // Constant offset - calculated using offset()
735 static jlong _offset = 116444736000000000;
736 // Fake time counter for reproducible results when debugging
737 static jlong fake_time = 0;
738
739 #ifdef ASSERT
740 // Just to be safe, recalculate the offset in debug mode
741 static jlong _calculated_offset = 0;
742 static int _has_calculated_offset = 0;
743
744 jlong offset() {
745 if (_has_calculated_offset) return _calculated_offset;
746 SYSTEMTIME java_origin;
747 java_origin.wYear = 1970;
748 java_origin.wMonth = 1;
749 java_origin.wDayOfWeek = 0; // ignored
750 java_origin.wDay = 1;
751 java_origin.wHour = 0;
752 java_origin.wMinute = 0;
753 java_origin.wSecond = 0;
754 java_origin.wMilliseconds = 0;
755 FILETIME jot;
756 if (!SystemTimeToFileTime(&java_origin, &jot)) {
757 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
758 }
759 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
760 _has_calculated_offset = 1;
761 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
762 return _calculated_offset;
763 }
764 #else
765 jlong offset() {
766 return _offset;
767 }
768 #endif
769
770 jlong windows_to_java_time(FILETIME wt) {
771 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
772 return (a - offset()) / 10000;
773 }
774
775 FILETIME java_to_windows_time(jlong l) {
776 jlong a = (l * 10000) + offset();
777 FILETIME result;
778 result.dwHighDateTime = high(a);
779 result.dwLowDateTime = low(a);
780 return result;
781 }
782
783 // For now, we say that Windows does not support vtime. I have no idea
784 // whether it can actually be made to (DLD, 9/13/05).
785
786 bool os::supports_vtime() { return false; }
787 bool os::enable_vtime() { return false; }
788 bool os::vtime_enabled() { return false; }
789 double os::elapsedVTime() {
790 // better than nothing, but not much
791 return elapsedTime();
792 }
793
794 jlong os::javaTimeMillis() {
795 if (UseFakeTimers) {
796 return fake_time++;
797 } else {
798 FILETIME wt;
799 GetSystemTimeAsFileTime(&wt);
800 return windows_to_java_time(wt);
801 }
802 }
803
804 jlong os::javaTimeNanos() {
805 if (!has_performance_count) {
806 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
807 } else {
808 LARGE_INTEGER current_count;
809 QueryPerformanceCounter(¤t_count);
810 double current = as_long(current_count);
811 double freq = performance_frequency;
812 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
813 return time;
814 }
815 }
816
817 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
818 if (!has_performance_count) {
819 // javaTimeMillis() doesn't have much percision,
820 // but it is not going to wrap -- so all 64 bits
821 info_ptr->max_value = ALL_64_BITS;
822
823 // this is a wall clock timer, so may skip
824 info_ptr->may_skip_backward = true;
825 info_ptr->may_skip_forward = true;
826 } else {
827 jlong freq = performance_frequency;
828 if (freq < NANOSECS_PER_SEC) {
829 // the performance counter is 64 bits and we will
830 // be multiplying it -- so no wrap in 64 bits
831 info_ptr->max_value = ALL_64_BITS;
832 } else if (freq > NANOSECS_PER_SEC) {
833 // use the max value the counter can reach to
834 // determine the max value which could be returned
835 julong max_counter = (julong)ALL_64_BITS;
836 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
837 } else {
838 // the performance counter is 64 bits and we will
839 // be using it directly -- so no wrap in 64 bits
840 info_ptr->max_value = ALL_64_BITS;
841 }
842
843 // using a counter, so no skipping
844 info_ptr->may_skip_backward = false;
845 info_ptr->may_skip_forward = false;
846 }
847 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
848 }
849
850 char* os::local_time_string(char *buf, size_t buflen) {
851 SYSTEMTIME st;
852 GetLocalTime(&st);
853 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
854 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
855 return buf;
856 }
857
858 bool os::getTimesSecs(double* process_real_time,
859 double* process_user_time,
860 double* process_system_time) {
861 HANDLE h_process = GetCurrentProcess();
862 FILETIME create_time, exit_time, kernel_time, user_time;
863 BOOL result = GetProcessTimes(h_process,
864 &create_time,
865 &exit_time,
866 &kernel_time,
867 &user_time);
868 if (result != 0) {
869 FILETIME wt;
870 GetSystemTimeAsFileTime(&wt);
871 jlong rtc_millis = windows_to_java_time(wt);
872 jlong user_millis = windows_to_java_time(user_time);
873 jlong system_millis = windows_to_java_time(kernel_time);
874 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
875 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
876 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
877 return true;
878 } else {
879 return false;
880 }
881 }
882
883 void os::shutdown() {
884
885 // allow PerfMemory to attempt cleanup of any persistent resources
886 perfMemory_exit();
887
888 // flush buffered output, finish log files
889 ostream_abort();
890
891 // Check for abort hook
892 abort_hook_t abort_hook = Arguments::abort_hook();
893 if (abort_hook != NULL) {
894 abort_hook();
895 }
896 }
897
898
899 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
900 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
901
902 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
903 HINSTANCE dbghelp;
904 EXCEPTION_POINTERS ep;
905 MINIDUMP_EXCEPTION_INFORMATION mei;
906 MINIDUMP_EXCEPTION_INFORMATION* pmei;
907
908 HANDLE hProcess = GetCurrentProcess();
909 DWORD processId = GetCurrentProcessId();
910 HANDLE dumpFile;
911 MINIDUMP_TYPE dumpType;
912 static const char* cwd;
913
914 // If running on a client version of Windows and user has not explicitly enabled dumping
915 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
916 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
917 return;
918 // If running on a server version of Windows and user has explictly disabled dumping
919 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
920 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
921 return;
922 }
923
924 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
925
926 if (dbghelp == NULL) {
927 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
928 return;
929 }
930
931 _MiniDumpWriteDump = CAST_TO_FN_PTR(
932 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
933 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
934 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
935
936 if (_MiniDumpWriteDump == NULL) {
937 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
938 return;
939 }
940
941 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
942
943 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
944 // API_VERSION_NUMBER 11 or higher contains the ones we want though
945 #if API_VERSION_NUMBER >= 11
946 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
947 MiniDumpWithUnloadedModules);
948 #endif
949
950 cwd = get_current_directory(NULL, 0);
951 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
952 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
953
954 if (dumpFile == INVALID_HANDLE_VALUE) {
955 VMError::report_coredump_status("Failed to create file for dumping", false);
956 return;
957 }
958 if (exceptionRecord != NULL && contextRecord != NULL) {
959 ep.ContextRecord = (PCONTEXT) contextRecord;
960 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
961
962 mei.ThreadId = GetCurrentThreadId();
963 mei.ExceptionPointers = &ep;
964 pmei = &mei;
965 } else {
966 pmei = NULL;
967 }
968
969
970 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
971 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
972 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
973 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
974 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
975 } else {
976 VMError::report_coredump_status(buffer, true);
977 }
978
979 CloseHandle(dumpFile);
980 }
981
982
983
984 void os::abort(bool dump_core)
985 {
986 os::shutdown();
987 // no core dump on Windows
988 ::exit(1);
989 }
990
991 // Die immediately, no exit hook, no abort hook, no cleanup.
992 void os::die() {
993 _exit(-1);
994 }
995
996 // Directory routines copied from src/win32/native/java/io/dirent_md.c
997 // * dirent_md.c 1.15 00/02/02
998 //
999 // The declarations for DIR and struct dirent are in jvm_win32.h.
1000
1001 /* Caller must have already run dirname through JVM_NativePath, which removes
1002 duplicate slashes and converts all instances of '/' into '\\'. */
1003
1004 DIR *
1005 os::opendir(const char *dirname)
1006 {
1007 assert(dirname != NULL, "just checking"); // hotspot change
1008 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1009 DWORD fattr; // hotspot change
1010 char alt_dirname[4] = { 0, 0, 0, 0 };
1011
1012 if (dirp == 0) {
1013 errno = ENOMEM;
1014 return 0;
1015 }
1016
1017 /*
1018 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1019 * as a directory in FindFirstFile(). We detect this case here and
1020 * prepend the current drive name.
1021 */
1022 if (dirname[1] == '\0' && dirname[0] == '\\') {
1023 alt_dirname[0] = _getdrive() + 'A' - 1;
1024 alt_dirname[1] = ':';
1025 alt_dirname[2] = '\\';
1026 alt_dirname[3] = '\0';
1027 dirname = alt_dirname;
1028 }
1029
1030 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1031 if (dirp->path == 0) {
1032 free(dirp, mtInternal);
1033 errno = ENOMEM;
1034 return 0;
1035 }
1036 strcpy(dirp->path, dirname);
1037
1038 fattr = GetFileAttributes(dirp->path);
1039 if (fattr == 0xffffffff) {
1040 free(dirp->path, mtInternal);
1041 free(dirp, mtInternal);
1042 errno = ENOENT;
1043 return 0;
1044 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1045 free(dirp->path, mtInternal);
1046 free(dirp, mtInternal);
1047 errno = ENOTDIR;
1048 return 0;
1049 }
1050
1051 /* Append "*.*", or possibly "\\*.*", to path */
1052 if (dirp->path[1] == ':'
1053 && (dirp->path[2] == '\0'
1054 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1055 /* No '\\' needed for cases like "Z:" or "Z:\" */
1056 strcat(dirp->path, "*.*");
1057 } else {
1058 strcat(dirp->path, "\\*.*");
1059 }
1060
1061 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1062 if (dirp->handle == INVALID_HANDLE_VALUE) {
1063 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1064 free(dirp->path, mtInternal);
1065 free(dirp, mtInternal);
1066 errno = EACCES;
1067 return 0;
1068 }
1069 }
1070 return dirp;
1071 }
1072
1073 /* parameter dbuf unused on Windows */
1074
1075 struct dirent *
1076 os::readdir(DIR *dirp, dirent *dbuf)
1077 {
1078 assert(dirp != NULL, "just checking"); // hotspot change
1079 if (dirp->handle == INVALID_HANDLE_VALUE) {
1080 return 0;
1081 }
1082
1083 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1084
1085 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1086 if (GetLastError() == ERROR_INVALID_HANDLE) {
1087 errno = EBADF;
1088 return 0;
1089 }
1090 FindClose(dirp->handle);
1091 dirp->handle = INVALID_HANDLE_VALUE;
1092 }
1093
1094 return &dirp->dirent;
1095 }
1096
1097 int
1098 os::closedir(DIR *dirp)
1099 {
1100 assert(dirp != NULL, "just checking"); // hotspot change
1101 if (dirp->handle != INVALID_HANDLE_VALUE) {
1102 if (!FindClose(dirp->handle)) {
1103 errno = EBADF;
1104 return -1;
1105 }
1106 dirp->handle = INVALID_HANDLE_VALUE;
1107 }
1108 free(dirp->path, mtInternal);
1109 free(dirp, mtInternal);
1110 return 0;
1111 }
1112
1113 // This must be hard coded because it's the system's temporary
1114 // directory not the java application's temp directory, ala java.io.tmpdir.
1115 const char* os::get_temp_directory() {
1116 static char path_buf[MAX_PATH];
1117 if (GetTempPath(MAX_PATH, path_buf)>0)
1118 return path_buf;
1119 else{
1120 path_buf[0]='\0';
1121 return path_buf;
1122 }
1123 }
1124
1125 static bool file_exists(const char* filename) {
1126 if (filename == NULL || strlen(filename) == 0) {
1127 return false;
1128 }
1129 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1130 }
1131
1132 bool os::dll_build_name(char *buffer, size_t buflen,
1133 const char* pname, const char* fname) {
1134 bool retval = false;
1135 const size_t pnamelen = pname ? strlen(pname) : 0;
1136 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1137
1138 // Return error on buffer overflow.
1139 if (pnamelen + strlen(fname) + 10 > buflen) {
1140 return retval;
1141 }
1142
1143 if (pnamelen == 0) {
1144 jio_snprintf(buffer, buflen, "%s.dll", fname);
1145 retval = true;
1146 } else if (c == ':' || c == '\\') {
1147 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1148 retval = true;
1149 } else if (strchr(pname, *os::path_separator()) != NULL) {
1150 int n;
1151 char** pelements = split_path(pname, &n);
1152 for (int i = 0 ; i < n ; i++) {
1153 char* path = pelements[i];
1154 // Really shouldn't be NULL, but check can't hurt
1155 size_t plen = (path == NULL) ? 0 : strlen(path);
1156 if (plen == 0) {
1157 continue; // skip the empty path values
1158 }
1159 const char lastchar = path[plen - 1];
1160 if (lastchar == ':' || lastchar == '\\') {
1161 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1162 } else {
1163 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1164 }
1165 if (file_exists(buffer)) {
1166 retval = true;
1167 break;
1168 }
1169 }
1170 // release the storage
1171 for (int i = 0 ; i < n ; i++) {
1172 if (pelements[i] != NULL) {
1173 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1174 }
1175 }
1176 if (pelements != NULL) {
1177 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1178 }
1179 } else {
1180 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1181 retval = true;
1182 }
1183 return retval;
1184 }
1185
1186 // Needs to be in os specific directory because windows requires another
1187 // header file <direct.h>
1188 const char* os::get_current_directory(char *buf, int buflen) {
1189 return _getcwd(buf, buflen);
1190 }
1191
1192 //-----------------------------------------------------------
1193 // Helper functions for fatal error handler
1194 #ifdef _WIN64
1195 // Helper routine which returns true if address in
1196 // within the NTDLL address space.
1197 //
1198 static bool _addr_in_ntdll( address addr )
1199 {
1200 HMODULE hmod;
1201 MODULEINFO minfo;
1202
1203 hmod = GetModuleHandle("NTDLL.DLL");
1204 if ( hmod == NULL ) return false;
1205 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1206 &minfo, sizeof(MODULEINFO)) )
1207 return false;
1208
1209 if ( (addr >= minfo.lpBaseOfDll) &&
1210 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1211 return true;
1212 else
1213 return false;
1214 }
1215 #endif
1216
1217
1218 // Enumerate all modules for a given process ID
1219 //
1220 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1221 // different API for doing this. We use PSAPI.DLL on NT based
1222 // Windows and ToolHelp on 95/98/Me.
1223
1224 // Callback function that is called by enumerate_modules() on
1225 // every DLL module.
1226 // Input parameters:
1227 // int pid,
1228 // char* module_file_name,
1229 // address module_base_addr,
1230 // unsigned module_size,
1231 // void* param
1232 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1233
1234 // enumerate_modules for Windows NT, using PSAPI
1235 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1236 {
1237 HANDLE hProcess ;
1238
1239 # define MAX_NUM_MODULES 128
1240 HMODULE modules[MAX_NUM_MODULES];
1241 static char filename[ MAX_PATH ];
1242 int result = 0;
1243
1244 if (!os::PSApiDll::PSApiAvailable()) {
1245 return 0;
1246 }
1247
1248 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1249 FALSE, pid ) ;
1250 if (hProcess == NULL) return 0;
1251
1252 DWORD size_needed;
1253 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1254 sizeof(modules), &size_needed)) {
1255 CloseHandle( hProcess );
1256 return 0;
1257 }
1258
1259 // number of modules that are currently loaded
1260 int num_modules = size_needed / sizeof(HMODULE);
1261
1262 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1263 // Get Full pathname:
1264 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1265 filename, sizeof(filename))) {
1266 filename[0] = '\0';
1267 }
1268
1269 MODULEINFO modinfo;
1270 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1271 &modinfo, sizeof(modinfo))) {
1272 modinfo.lpBaseOfDll = NULL;
1273 modinfo.SizeOfImage = 0;
1274 }
1275
1276 // Invoke callback function
1277 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1278 modinfo.SizeOfImage, param);
1279 if (result) break;
1280 }
1281
1282 CloseHandle( hProcess ) ;
1283 return result;
1284 }
1285
1286
1287 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1288 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1289 {
1290 HANDLE hSnapShot ;
1291 static MODULEENTRY32 modentry ;
1292 int result = 0;
1293
1294 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1295 return 0;
1296 }
1297
1298 // Get a handle to a Toolhelp snapshot of the system
1299 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1300 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1301 return FALSE ;
1302 }
1303
1304 // iterate through all modules
1305 modentry.dwSize = sizeof(MODULEENTRY32) ;
1306 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1307
1308 while( not_done ) {
1309 // invoke the callback
1310 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1311 modentry.modBaseSize, param);
1312 if (result) break;
1313
1314 modentry.dwSize = sizeof(MODULEENTRY32) ;
1315 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1316 }
1317
1318 CloseHandle(hSnapShot);
1319 return result;
1320 }
1321
1322 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1323 {
1324 // Get current process ID if caller doesn't provide it.
1325 if (!pid) pid = os::current_process_id();
1326
1327 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1328 else return _enumerate_modules_windows(pid, func, param);
1329 }
1330
1331 struct _modinfo {
1332 address addr;
1333 char* full_path; // point to a char buffer
1334 int buflen; // size of the buffer
1335 address base_addr;
1336 };
1337
1338 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1339 unsigned size, void * param) {
1340 struct _modinfo *pmod = (struct _modinfo *)param;
1341 if (!pmod) return -1;
1342
1343 if (base_addr <= pmod->addr &&
1344 base_addr+size > pmod->addr) {
1345 // if a buffer is provided, copy path name to the buffer
1346 if (pmod->full_path) {
1347 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1348 }
1349 pmod->base_addr = base_addr;
1350 return 1;
1351 }
1352 return 0;
1353 }
1354
1355 bool os::dll_address_to_library_name(address addr, char* buf,
1356 int buflen, int* offset) {
1357 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1358 // return the full path to the DLL file, sometimes it returns path
1359 // to the corresponding PDB file (debug info); sometimes it only
1360 // returns partial path, which makes life painful.
1361
1362 struct _modinfo mi;
1363 mi.addr = addr;
1364 mi.full_path = buf;
1365 mi.buflen = buflen;
1366 int pid = os::current_process_id();
1367 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1368 // buf already contains path name
1369 if (offset) *offset = addr - mi.base_addr;
1370 return true;
1371 } else {
1372 if (buf) buf[0] = '\0';
1373 if (offset) *offset = -1;
1374 return false;
1375 }
1376 }
1377
1378 bool os::dll_address_to_function_name(address addr, char *buf,
1379 int buflen, int *offset) {
1380 if (Decoder::decode(addr, buf, buflen, offset)) {
1381 return true;
1382 }
1383 if (offset != NULL) *offset = -1;
1384 if (buf != NULL) buf[0] = '\0';
1385 return false;
1386 }
1387
1388 // save the start and end address of jvm.dll into param[0] and param[1]
1389 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1390 unsigned size, void * param) {
1391 if (!param) return -1;
1392
1393 if (base_addr <= (address)_locate_jvm_dll &&
1394 base_addr+size > (address)_locate_jvm_dll) {
1395 ((address*)param)[0] = base_addr;
1396 ((address*)param)[1] = base_addr + size;
1397 return 1;
1398 }
1399 return 0;
1400 }
1401
1402 address vm_lib_location[2]; // start and end address of jvm.dll
1403
1404 // check if addr is inside jvm.dll
1405 bool os::address_is_in_vm(address addr) {
1406 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1407 int pid = os::current_process_id();
1408 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1409 assert(false, "Can't find jvm module.");
1410 return false;
1411 }
1412 }
1413
1414 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1415 }
1416
1417 // print module info; param is outputStream*
1418 static int _print_module(int pid, char* fname, address base,
1419 unsigned size, void* param) {
1420 if (!param) return -1;
1421
1422 outputStream* st = (outputStream*)param;
1423
1424 address end_addr = base + size;
1425 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1426 return 0;
1427 }
1428
1429 // Loads .dll/.so and
1430 // in case of error it checks if .dll/.so was built for the
1431 // same architecture as Hotspot is running on
1432 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1433 {
1434 void * result = LoadLibrary(name);
1435 if (result != NULL)
1436 {
1437 return result;
1438 }
1439
1440 DWORD errcode = GetLastError();
1441 if (errcode == ERROR_MOD_NOT_FOUND) {
1442 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1443 ebuf[ebuflen-1]='\0';
1444 return NULL;
1445 }
1446
1447 // Parsing dll below
1448 // If we can read dll-info and find that dll was built
1449 // for an architecture other than Hotspot is running in
1450 // - then print to buffer "DLL was built for a different architecture"
1451 // else call os::lasterror to obtain system error message
1452
1453 // Read system error message into ebuf
1454 // It may or may not be overwritten below (in the for loop and just above)
1455 lasterror(ebuf, (size_t) ebuflen);
1456 ebuf[ebuflen-1]='\0';
1457 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1458 if (file_descriptor<0)
1459 {
1460 return NULL;
1461 }
1462
1463 uint32_t signature_offset;
1464 uint16_t lib_arch=0;
1465 bool failed_to_get_lib_arch=
1466 (
1467 //Go to position 3c in the dll
1468 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1469 ||
1470 // Read loacation of signature
1471 (sizeof(signature_offset)!=
1472 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1473 ||
1474 //Go to COFF File Header in dll
1475 //that is located after"signature" (4 bytes long)
1476 (os::seek_to_file_offset(file_descriptor,
1477 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1478 ||
1479 //Read field that contains code of architecture
1480 // that dll was build for
1481 (sizeof(lib_arch)!=
1482 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1483 );
1484
1485 ::close(file_descriptor);
1486 if (failed_to_get_lib_arch)
1487 {
1488 // file i/o error - report os::lasterror(...) msg
1489 return NULL;
1490 }
1491
1492 typedef struct
1493 {
1494 uint16_t arch_code;
1495 char* arch_name;
1496 } arch_t;
1497
1498 static const arch_t arch_array[]={
1499 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1500 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1501 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1502 };
1503 #if (defined _M_IA64)
1504 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1505 #elif (defined _M_AMD64)
1506 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1507 #elif (defined _M_IX86)
1508 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1509 #else
1510 #error Method os::dll_load requires that one of following \
1511 is defined :_M_IA64,_M_AMD64 or _M_IX86
1512 #endif
1513
1514
1515 // Obtain a string for printf operation
1516 // lib_arch_str shall contain string what platform this .dll was built for
1517 // running_arch_str shall string contain what platform Hotspot was built for
1518 char *running_arch_str=NULL,*lib_arch_str=NULL;
1519 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1520 {
1521 if (lib_arch==arch_array[i].arch_code)
1522 lib_arch_str=arch_array[i].arch_name;
1523 if (running_arch==arch_array[i].arch_code)
1524 running_arch_str=arch_array[i].arch_name;
1525 }
1526
1527 assert(running_arch_str,
1528 "Didn't find runing architecture code in arch_array");
1529
1530 // If the architure is right
1531 // but some other error took place - report os::lasterror(...) msg
1532 if (lib_arch == running_arch)
1533 {
1534 return NULL;
1535 }
1536
1537 if (lib_arch_str!=NULL)
1538 {
1539 ::_snprintf(ebuf, ebuflen-1,
1540 "Can't load %s-bit .dll on a %s-bit platform",
1541 lib_arch_str,running_arch_str);
1542 }
1543 else
1544 {
1545 // don't know what architecture this dll was build for
1546 ::_snprintf(ebuf, ebuflen-1,
1547 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1548 lib_arch,running_arch_str);
1549 }
1550
1551 return NULL;
1552 }
1553
1554
1555 void os::print_dll_info(outputStream *st) {
1556 int pid = os::current_process_id();
1557 st->print_cr("Dynamic libraries:");
1558 enumerate_modules(pid, _print_module, (void *)st);
1559 }
1560
1561 void os::print_os_info_brief(outputStream* st) {
1562 os::print_os_info(st);
1563 }
1564
1565 void os::print_os_info(outputStream* st) {
1566 st->print("OS:");
1567
1568 os::win32::print_windows_version(st);
1569 }
1570
1571 void os::win32::print_windows_version(outputStream* st) {
1572 OSVERSIONINFOEX osvi;
1573 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1574 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1575
1576 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1577 st->print_cr("N/A");
1578 return;
1579 }
1580
1581 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1582 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1583 switch (os_vers) {
1584 case 3051: st->print(" Windows NT 3.51"); break;
1585 case 4000: st->print(" Windows NT 4.0"); break;
1586 case 5000: st->print(" Windows 2000"); break;
1587 case 5001: st->print(" Windows XP"); break;
1588 case 5002:
1589 case 6000:
1590 case 6001:
1591 case 6002: {
1592 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1593 // find out whether we are running on 64 bit processor or not.
1594 SYSTEM_INFO si;
1595 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1596 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1597 GetSystemInfo(&si);
1598 } else {
1599 os::Kernel32Dll::GetNativeSystemInfo(&si);
1600 }
1601 if (os_vers == 5002) {
1602 if (osvi.wProductType == VER_NT_WORKSTATION &&
1603 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1604 st->print(" Windows XP x64 Edition");
1605 else
1606 st->print(" Windows Server 2003 family");
1607 } else if (os_vers == 6000) {
1608 if (osvi.wProductType == VER_NT_WORKSTATION)
1609 st->print(" Windows Vista");
1610 else
1611 st->print(" Windows Server 2008");
1612 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1613 st->print(" , 64 bit");
1614 } else if (os_vers == 6001) {
1615 if (osvi.wProductType == VER_NT_WORKSTATION) {
1616 st->print(" Windows 7");
1617 } else {
1618 // Unrecognized windows, print out its major and minor versions
1619 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1620 }
1621 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1622 st->print(" , 64 bit");
1623 } else if (os_vers == 6002) {
1624 if (osvi.wProductType == VER_NT_WORKSTATION) {
1625 st->print(" Windows 8");
1626 } else {
1627 st->print(" Windows Server 2012");
1628 }
1629 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1630 st->print(" , 64 bit");
1631 } else { // future os
1632 // Unrecognized windows, print out its major and minor versions
1633 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1634 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1635 st->print(" , 64 bit");
1636 }
1637 break;
1638 }
1639 default: // future windows, print out its major and minor versions
1640 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1641 }
1642 } else {
1643 switch (os_vers) {
1644 case 4000: st->print(" Windows 95"); break;
1645 case 4010: st->print(" Windows 98"); break;
1646 case 4090: st->print(" Windows Me"); break;
1647 default: // future windows, print out its major and minor versions
1648 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1649 }
1650 }
1651 st->print(" Build %d", osvi.dwBuildNumber);
1652 st->print(" %s", osvi.szCSDVersion); // service pack
1653 st->cr();
1654 }
1655
1656 void os::pd_print_cpu_info(outputStream* st) {
1657 // Nothing to do for now.
1658 }
1659
1660 void os::print_memory_info(outputStream* st) {
1661 st->print("Memory:");
1662 st->print(" %dk page", os::vm_page_size()>>10);
1663
1664 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1665 // value if total memory is larger than 4GB
1666 MEMORYSTATUSEX ms;
1667 ms.dwLength = sizeof(ms);
1668 GlobalMemoryStatusEx(&ms);
1669
1670 st->print(", physical %uk", os::physical_memory() >> 10);
1671 st->print("(%uk free)", os::available_memory() >> 10);
1672
1673 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1674 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1675 st->cr();
1676 }
1677
1678 void os::print_siginfo(outputStream *st, void *siginfo) {
1679 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1680 st->print("siginfo:");
1681 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1682
1683 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1684 er->NumberParameters >= 2) {
1685 switch (er->ExceptionInformation[0]) {
1686 case 0: st->print(", reading address"); break;
1687 case 1: st->print(", writing address"); break;
1688 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1689 er->ExceptionInformation[0]);
1690 }
1691 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1692 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1693 er->NumberParameters >= 2 && UseSharedSpaces) {
1694 FileMapInfo* mapinfo = FileMapInfo::current_info();
1695 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1696 st->print("\n\nError accessing class data sharing archive." \
1697 " Mapped file inaccessible during execution, " \
1698 " possible disk/network problem.");
1699 }
1700 } else {
1701 int num = er->NumberParameters;
1702 if (num > 0) {
1703 st->print(", ExceptionInformation=");
1704 for (int i = 0; i < num; i++) {
1705 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1706 }
1707 }
1708 }
1709 st->cr();
1710 }
1711
1712 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1713 // do nothing
1714 }
1715
1716 static char saved_jvm_path[MAX_PATH] = {0};
1717
1718 // Find the full path to the current module, jvm.dll or jvm_g.dll
1719 void os::jvm_path(char *buf, jint buflen) {
1720 // Error checking.
1721 if (buflen < MAX_PATH) {
1722 assert(false, "must use a large-enough buffer");
1723 buf[0] = '\0';
1724 return;
1725 }
1726 // Lazy resolve the path to current module.
1727 if (saved_jvm_path[0] != 0) {
1728 strcpy(buf, saved_jvm_path);
1729 return;
1730 }
1731
1732 buf[0] = '\0';
1733 if (Arguments::created_by_gamma_launcher()) {
1734 // Support for the gamma launcher. Check for an
1735 // JAVA_HOME environment variable
1736 // and fix up the path so it looks like
1737 // libjvm.so is installed there (append a fake suffix
1738 // hotspot/libjvm.so).
1739 char* java_home_var = ::getenv("JAVA_HOME");
1740 if (java_home_var != NULL && java_home_var[0] != 0) {
1741
1742 strncpy(buf, java_home_var, buflen);
1743
1744 // determine if this is a legacy image or modules image
1745 // modules image doesn't have "jre" subdirectory
1746 size_t len = strlen(buf);
1747 char* jrebin_p = buf + len;
1748 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1749 if (0 != _access(buf, 0)) {
1750 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1751 }
1752 len = strlen(buf);
1753 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1754 }
1755 }
1756
1757 if(buf[0] == '\0') {
1758 GetModuleFileName(vm_lib_handle, buf, buflen);
1759 }
1760 strcpy(saved_jvm_path, buf);
1761 }
1762
1763
1764 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1765 #ifndef _WIN64
1766 st->print("_");
1767 #endif
1768 }
1769
1770
1771 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1772 #ifndef _WIN64
1773 st->print("@%d", args_size * sizeof(int));
1774 #endif
1775 }
1776
1777 // This method is a copy of JDK's sysGetLastErrorString
1778 // from src/windows/hpi/src/system_md.c
1779
1780 size_t os::lasterror(char* buf, size_t len) {
1781 DWORD errval;
1782
1783 if ((errval = GetLastError()) != 0) {
1784 // DOS error
1785 size_t n = (size_t)FormatMessage(
1786 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1787 NULL,
1788 errval,
1789 0,
1790 buf,
1791 (DWORD)len,
1792 NULL);
1793 if (n > 3) {
1794 // Drop final '.', CR, LF
1795 if (buf[n - 1] == '\n') n--;
1796 if (buf[n - 1] == '\r') n--;
1797 if (buf[n - 1] == '.') n--;
1798 buf[n] = '\0';
1799 }
1800 return n;
1801 }
1802
1803 if (errno != 0) {
1804 // C runtime error that has no corresponding DOS error code
1805 const char* s = strerror(errno);
1806 size_t n = strlen(s);
1807 if (n >= len) n = len - 1;
1808 strncpy(buf, s, n);
1809 buf[n] = '\0';
1810 return n;
1811 }
1812
1813 return 0;
1814 }
1815
1816 int os::get_last_error() {
1817 DWORD error = GetLastError();
1818 if (error == 0)
1819 error = errno;
1820 return (int)error;
1821 }
1822
1823 // sun.misc.Signal
1824 // NOTE that this is a workaround for an apparent kernel bug where if
1825 // a signal handler for SIGBREAK is installed then that signal handler
1826 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1827 // See bug 4416763.
1828 static void (*sigbreakHandler)(int) = NULL;
1829
1830 static void UserHandler(int sig, void *siginfo, void *context) {
1831 os::signal_notify(sig);
1832 // We need to reinstate the signal handler each time...
1833 os::signal(sig, (void*)UserHandler);
1834 }
1835
1836 void* os::user_handler() {
1837 return (void*) UserHandler;
1838 }
1839
1840 void* os::signal(int signal_number, void* handler) {
1841 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1842 void (*oldHandler)(int) = sigbreakHandler;
1843 sigbreakHandler = (void (*)(int)) handler;
1844 return (void*) oldHandler;
1845 } else {
1846 return (void*)::signal(signal_number, (void (*)(int))handler);
1847 }
1848 }
1849
1850 void os::signal_raise(int signal_number) {
1851 raise(signal_number);
1852 }
1853
1854 // The Win32 C runtime library maps all console control events other than ^C
1855 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1856 // logoff, and shutdown events. We therefore install our own console handler
1857 // that raises SIGTERM for the latter cases.
1858 //
1859 static BOOL WINAPI consoleHandler(DWORD event) {
1860 switch(event) {
1861 case CTRL_C_EVENT:
1862 if (is_error_reported()) {
1863 // Ctrl-C is pressed during error reporting, likely because the error
1864 // handler fails to abort. Let VM die immediately.
1865 os::die();
1866 }
1867
1868 os::signal_raise(SIGINT);
1869 return TRUE;
1870 break;
1871 case CTRL_BREAK_EVENT:
1872 if (sigbreakHandler != NULL) {
1873 (*sigbreakHandler)(SIGBREAK);
1874 }
1875 return TRUE;
1876 break;
1877 case CTRL_CLOSE_EVENT:
1878 case CTRL_LOGOFF_EVENT:
1879 case CTRL_SHUTDOWN_EVENT:
1880 os::signal_raise(SIGTERM);
1881 return TRUE;
1882 break;
1883 default:
1884 break;
1885 }
1886 return FALSE;
1887 }
1888
1889 /*
1890 * The following code is moved from os.cpp for making this
1891 * code platform specific, which it is by its very nature.
1892 */
1893
1894 // Return maximum OS signal used + 1 for internal use only
1895 // Used as exit signal for signal_thread
1896 int os::sigexitnum_pd(){
1897 return NSIG;
1898 }
1899
1900 // a counter for each possible signal value, including signal_thread exit signal
1901 static volatile jint pending_signals[NSIG+1] = { 0 };
1902 static HANDLE sig_sem;
1903
1904 void os::signal_init_pd() {
1905 // Initialize signal structures
1906 memset((void*)pending_signals, 0, sizeof(pending_signals));
1907
1908 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1909
1910 // Programs embedding the VM do not want it to attempt to receive
1911 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1912 // shutdown hooks mechanism introduced in 1.3. For example, when
1913 // the VM is run as part of a Windows NT service (i.e., a servlet
1914 // engine in a web server), the correct behavior is for any console
1915 // control handler to return FALSE, not TRUE, because the OS's
1916 // "final" handler for such events allows the process to continue if
1917 // it is a service (while terminating it if it is not a service).
1918 // To make this behavior uniform and the mechanism simpler, we
1919 // completely disable the VM's usage of these console events if -Xrs
1920 // (=ReduceSignalUsage) is specified. This means, for example, that
1921 // the CTRL-BREAK thread dump mechanism is also disabled in this
1922 // case. See bugs 4323062, 4345157, and related bugs.
1923
1924 if (!ReduceSignalUsage) {
1925 // Add a CTRL-C handler
1926 SetConsoleCtrlHandler(consoleHandler, TRUE);
1927 }
1928 }
1929
1930 void os::signal_notify(int signal_number) {
1931 BOOL ret;
1932
1933 Atomic::inc(&pending_signals[signal_number]);
1934 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1935 assert(ret != 0, "ReleaseSemaphore() failed");
1936 }
1937
1938 static int check_pending_signals(bool wait_for_signal) {
1939 DWORD ret;
1940 while (true) {
1941 for (int i = 0; i < NSIG + 1; i++) {
1942 jint n = pending_signals[i];
1943 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1944 return i;
1945 }
1946 }
1947 if (!wait_for_signal) {
1948 return -1;
1949 }
1950
1951 JavaThread *thread = JavaThread::current();
1952
1953 ThreadBlockInVM tbivm(thread);
1954
1955 bool threadIsSuspended;
1956 do {
1957 thread->set_suspend_equivalent();
1958 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1959 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1960 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1961
1962 // were we externally suspended while we were waiting?
1963 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1964 if (threadIsSuspended) {
1965 //
1966 // The semaphore has been incremented, but while we were waiting
1967 // another thread suspended us. We don't want to continue running
1968 // while suspended because that would surprise the thread that
1969 // suspended us.
1970 //
1971 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1972 assert(ret != 0, "ReleaseSemaphore() failed");
1973
1974 thread->java_suspend_self();
1975 }
1976 } while (threadIsSuspended);
1977 }
1978 }
1979
1980 int os::signal_lookup() {
1981 return check_pending_signals(false);
1982 }
1983
1984 int os::signal_wait() {
1985 return check_pending_signals(true);
1986 }
1987
1988 // Implicit OS exception handling
1989
1990 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1991 JavaThread* thread = JavaThread::current();
1992 // Save pc in thread
1993 #ifdef _M_IA64
1994 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1995 // Set pc to handler
1996 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1997 #elif _M_AMD64
1998 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1999 // Set pc to handler
2000 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2001 #else
2002 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
2003 // Set pc to handler
2004 exceptionInfo->ContextRecord->Eip = (LONG)handler;
2005 #endif
2006
2007 // Continue the execution
2008 return EXCEPTION_CONTINUE_EXECUTION;
2009 }
2010
2011
2012 // Used for PostMortemDump
2013 extern "C" void safepoints();
2014 extern "C" void find(int x);
2015 extern "C" void events();
2016
2017 // According to Windows API documentation, an illegal instruction sequence should generate
2018 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2019 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2020 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2021
2022 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2023
2024 // From "Execution Protection in the Windows Operating System" draft 0.35
2025 // Once a system header becomes available, the "real" define should be
2026 // included or copied here.
2027 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2028
2029 #define def_excpt(val) #val, val
2030
2031 struct siglabel {
2032 char *name;
2033 int number;
2034 };
2035
2036 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2037 // C++ compiler contain this error code. Because this is a compiler-generated
2038 // error, the code is not listed in the Win32 API header files.
2039 // The code is actually a cryptic mnemonic device, with the initial "E"
2040 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2041 // ASCII values of "msc".
2042
2043 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2044
2045
2046 struct siglabel exceptlabels[] = {
2047 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2048 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2049 def_excpt(EXCEPTION_BREAKPOINT),
2050 def_excpt(EXCEPTION_SINGLE_STEP),
2051 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2052 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2053 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2054 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2055 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2056 def_excpt(EXCEPTION_FLT_OVERFLOW),
2057 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2058 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2059 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2060 def_excpt(EXCEPTION_INT_OVERFLOW),
2061 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2062 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2063 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2064 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2065 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2066 def_excpt(EXCEPTION_STACK_OVERFLOW),
2067 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2068 def_excpt(EXCEPTION_GUARD_PAGE),
2069 def_excpt(EXCEPTION_INVALID_HANDLE),
2070 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2071 NULL, 0
2072 };
2073
2074 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2075 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2076 if (exceptlabels[i].number == exception_code) {
2077 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2078 return buf;
2079 }
2080 }
2081
2082 return NULL;
2083 }
2084
2085 //-----------------------------------------------------------------------------
2086 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2087 // handle exception caused by idiv; should only happen for -MinInt/-1
2088 // (division by zero is handled explicitly)
2089 #ifdef _M_IA64
2090 assert(0, "Fix Handle_IDiv_Exception");
2091 #elif _M_AMD64
2092 PCONTEXT ctx = exceptionInfo->ContextRecord;
2093 address pc = (address)ctx->Rip;
2094 assert(pc[0] == 0xF7, "not an idiv opcode");
2095 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2096 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2097 // set correct result values and continue after idiv instruction
2098 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2099 ctx->Rax = (DWORD)min_jint; // result
2100 ctx->Rdx = (DWORD)0; // remainder
2101 // Continue the execution
2102 #else
2103 PCONTEXT ctx = exceptionInfo->ContextRecord;
2104 address pc = (address)ctx->Eip;
2105 assert(pc[0] == 0xF7, "not an idiv opcode");
2106 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2107 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2108 // set correct result values and continue after idiv instruction
2109 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2110 ctx->Eax = (DWORD)min_jint; // result
2111 ctx->Edx = (DWORD)0; // remainder
2112 // Continue the execution
2113 #endif
2114 return EXCEPTION_CONTINUE_EXECUTION;
2115 }
2116
2117 #ifndef _WIN64
2118 //-----------------------------------------------------------------------------
2119 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2120 // handle exception caused by native method modifying control word
2121 PCONTEXT ctx = exceptionInfo->ContextRecord;
2122 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2123
2124 switch (exception_code) {
2125 case EXCEPTION_FLT_DENORMAL_OPERAND:
2126 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2127 case EXCEPTION_FLT_INEXACT_RESULT:
2128 case EXCEPTION_FLT_INVALID_OPERATION:
2129 case EXCEPTION_FLT_OVERFLOW:
2130 case EXCEPTION_FLT_STACK_CHECK:
2131 case EXCEPTION_FLT_UNDERFLOW:
2132 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2133 if (fp_control_word != ctx->FloatSave.ControlWord) {
2134 // Restore FPCW and mask out FLT exceptions
2135 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2136 // Mask out pending FLT exceptions
2137 ctx->FloatSave.StatusWord &= 0xffffff00;
2138 return EXCEPTION_CONTINUE_EXECUTION;
2139 }
2140 }
2141
2142 if (prev_uef_handler != NULL) {
2143 // We didn't handle this exception so pass it to the previous
2144 // UnhandledExceptionFilter.
2145 return (prev_uef_handler)(exceptionInfo);
2146 }
2147
2148 return EXCEPTION_CONTINUE_SEARCH;
2149 }
2150 #else //_WIN64
2151 /*
2152 On Windows, the mxcsr control bits are non-volatile across calls
2153 See also CR 6192333
2154 If EXCEPTION_FLT_* happened after some native method modified
2155 mxcsr - it is not a jvm fault.
2156 However should we decide to restore of mxcsr after a faulty
2157 native method we can uncomment following code
2158 jint MxCsr = INITIAL_MXCSR;
2159 // we can't use StubRoutines::addr_mxcsr_std()
2160 // because in Win64 mxcsr is not saved there
2161 if (MxCsr != ctx->MxCsr) {
2162 ctx->MxCsr = MxCsr;
2163 return EXCEPTION_CONTINUE_EXECUTION;
2164 }
2165
2166 */
2167 #endif //_WIN64
2168
2169
2170 // Fatal error reporting is single threaded so we can make this a
2171 // static and preallocated. If it's more than MAX_PATH silently ignore
2172 // it.
2173 static char saved_error_file[MAX_PATH] = {0};
2174
2175 void os::set_error_file(const char *logfile) {
2176 if (strlen(logfile) <= MAX_PATH) {
2177 strncpy(saved_error_file, logfile, MAX_PATH);
2178 }
2179 }
2180
2181 static inline void report_error(Thread* t, DWORD exception_code,
2182 address addr, void* siginfo, void* context) {
2183 VMError err(t, exception_code, addr, siginfo, context);
2184 err.report_and_die();
2185
2186 // If UseOsErrorReporting, this will return here and save the error file
2187 // somewhere where we can find it in the minidump.
2188 }
2189
2190 //-----------------------------------------------------------------------------
2191 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2192 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2193 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2194 #ifdef _M_IA64
2195 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2196 #elif _M_AMD64
2197 address pc = (address) exceptionInfo->ContextRecord->Rip;
2198 #else
2199 address pc = (address) exceptionInfo->ContextRecord->Eip;
2200 #endif
2201 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2202
2203 #ifndef _WIN64
2204 // Execution protection violation - win32 running on AMD64 only
2205 // Handled first to avoid misdiagnosis as a "normal" access violation;
2206 // This is safe to do because we have a new/unique ExceptionInformation
2207 // code for this condition.
2208 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2209 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2210 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2211 address addr = (address) exceptionRecord->ExceptionInformation[1];
2212
2213 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2214 int page_size = os::vm_page_size();
2215
2216 // Make sure the pc and the faulting address are sane.
2217 //
2218 // If an instruction spans a page boundary, and the page containing
2219 // the beginning of the instruction is executable but the following
2220 // page is not, the pc and the faulting address might be slightly
2221 // different - we still want to unguard the 2nd page in this case.
2222 //
2223 // 15 bytes seems to be a (very) safe value for max instruction size.
2224 bool pc_is_near_addr =
2225 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2226 bool instr_spans_page_boundary =
2227 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2228 (intptr_t) page_size) > 0);
2229
2230 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2231 static volatile address last_addr =
2232 (address) os::non_memory_address_word();
2233
2234 // In conservative mode, don't unguard unless the address is in the VM
2235 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2236 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2237
2238 // Set memory to RWX and retry
2239 address page_start =
2240 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2241 bool res = os::protect_memory((char*) page_start, page_size,
2242 os::MEM_PROT_RWX);
2243
2244 if (PrintMiscellaneous && Verbose) {
2245 char buf[256];
2246 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2247 "at " INTPTR_FORMAT
2248 ", unguarding " INTPTR_FORMAT ": %s", addr,
2249 page_start, (res ? "success" : strerror(errno)));
2250 tty->print_raw_cr(buf);
2251 }
2252
2253 // Set last_addr so if we fault again at the same address, we don't
2254 // end up in an endless loop.
2255 //
2256 // There are two potential complications here. Two threads trapping
2257 // at the same address at the same time could cause one of the
2258 // threads to think it already unguarded, and abort the VM. Likely
2259 // very rare.
2260 //
2261 // The other race involves two threads alternately trapping at
2262 // different addresses and failing to unguard the page, resulting in
2263 // an endless loop. This condition is probably even more unlikely
2264 // than the first.
2265 //
2266 // Although both cases could be avoided by using locks or thread
2267 // local last_addr, these solutions are unnecessary complication:
2268 // this handler is a best-effort safety net, not a complete solution.
2269 // It is disabled by default and should only be used as a workaround
2270 // in case we missed any no-execute-unsafe VM code.
2271
2272 last_addr = addr;
2273
2274 return EXCEPTION_CONTINUE_EXECUTION;
2275 }
2276 }
2277
2278 // Last unguard failed or not unguarding
2279 tty->print_raw_cr("Execution protection violation");
2280 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2281 exceptionInfo->ContextRecord);
2282 return EXCEPTION_CONTINUE_SEARCH;
2283 }
2284 }
2285 #endif // _WIN64
2286
2287 // Check to see if we caught the safepoint code in the
2288 // process of write protecting the memory serialization page.
2289 // It write enables the page immediately after protecting it
2290 // so just return.
2291 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2292 JavaThread* thread = (JavaThread*) t;
2293 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2294 address addr = (address) exceptionRecord->ExceptionInformation[1];
2295 if ( os::is_memory_serialize_page(thread, addr) ) {
2296 // Block current thread until the memory serialize page permission restored.
2297 os::block_on_serialize_page_trap();
2298 return EXCEPTION_CONTINUE_EXECUTION;
2299 }
2300 }
2301
2302 if (t != NULL && t->is_Java_thread()) {
2303 JavaThread* thread = (JavaThread*) t;
2304 bool in_java = thread->thread_state() == _thread_in_Java;
2305
2306 // Handle potential stack overflows up front.
2307 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2308 if (os::uses_stack_guard_pages()) {
2309 #ifdef _M_IA64
2310 //
2311 // If it's a legal stack address continue, Windows will map it in.
2312 //
2313 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2314 address addr = (address) exceptionRecord->ExceptionInformation[1];
2315 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2316 return EXCEPTION_CONTINUE_EXECUTION;
2317
2318 // The register save area is the same size as the memory stack
2319 // and starts at the page just above the start of the memory stack.
2320 // If we get a fault in this area, we've run out of register
2321 // stack. If we are in java, try throwing a stack overflow exception.
2322 if (addr > thread->stack_base() &&
2323 addr <= (thread->stack_base()+thread->stack_size()) ) {
2324 char buf[256];
2325 jio_snprintf(buf, sizeof(buf),
2326 "Register stack overflow, addr:%p, stack_base:%p\n",
2327 addr, thread->stack_base() );
2328 tty->print_raw_cr(buf);
2329 // If not in java code, return and hope for the best.
2330 return in_java ? Handle_Exception(exceptionInfo,
2331 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2332 : EXCEPTION_CONTINUE_EXECUTION;
2333 }
2334 #endif
2335 if (thread->stack_yellow_zone_enabled()) {
2336 // Yellow zone violation. The o/s has unprotected the first yellow
2337 // zone page for us. Note: must call disable_stack_yellow_zone to
2338 // update the enabled status, even if the zone contains only one page.
2339 thread->disable_stack_yellow_zone();
2340 // If not in java code, return and hope for the best.
2341 return in_java ? Handle_Exception(exceptionInfo,
2342 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2343 : EXCEPTION_CONTINUE_EXECUTION;
2344 } else {
2345 // Fatal red zone violation.
2346 thread->disable_stack_red_zone();
2347 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2348 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2349 exceptionInfo->ContextRecord);
2350 return EXCEPTION_CONTINUE_SEARCH;
2351 }
2352 } else if (in_java) {
2353 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2354 // a one-time-only guard page, which it has released to us. The next
2355 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2356 return Handle_Exception(exceptionInfo,
2357 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2358 } else {
2359 // Can only return and hope for the best. Further stack growth will
2360 // result in an ACCESS_VIOLATION.
2361 return EXCEPTION_CONTINUE_EXECUTION;
2362 }
2363 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2364 // Either stack overflow or null pointer exception.
2365 if (in_java) {
2366 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2367 address addr = (address) exceptionRecord->ExceptionInformation[1];
2368 address stack_end = thread->stack_base() - thread->stack_size();
2369 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2370 // Stack overflow.
2371 assert(!os::uses_stack_guard_pages(),
2372 "should be caught by red zone code above.");
2373 return Handle_Exception(exceptionInfo,
2374 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2375 }
2376 //
2377 // Check for safepoint polling and implicit null
2378 // We only expect null pointers in the stubs (vtable)
2379 // the rest are checked explicitly now.
2380 //
2381 CodeBlob* cb = CodeCache::find_blob(pc);
2382 if (cb != NULL) {
2383 if (os::is_poll_address(addr)) {
2384 address stub = SharedRuntime::get_poll_stub(pc);
2385 return Handle_Exception(exceptionInfo, stub);
2386 }
2387 }
2388 {
2389 #ifdef _WIN64
2390 //
2391 // If it's a legal stack address map the entire region in
2392 //
2393 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2394 address addr = (address) exceptionRecord->ExceptionInformation[1];
2395 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2396 addr = (address)((uintptr_t)addr &
2397 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2398 os::commit_memory((char *)addr, thread->stack_base() - addr,
2399 false );
2400 return EXCEPTION_CONTINUE_EXECUTION;
2401 }
2402 else
2403 #endif
2404 {
2405 // Null pointer exception.
2406 #ifdef _M_IA64
2407 // We catch register stack overflows in compiled code by doing
2408 // an explicit compare and executing a st8(G0, G0) if the
2409 // BSP enters into our guard area. We test for the overflow
2410 // condition and fall into the normal null pointer exception
2411 // code if BSP hasn't overflowed.
2412 if ( in_java ) {
2413 if(thread->register_stack_overflow()) {
2414 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2415 thread->register_stack_limit(),
2416 "GR7 doesn't contain register_stack_limit");
2417 // Disable the yellow zone which sets the state that
2418 // we've got a stack overflow problem.
2419 if (thread->stack_yellow_zone_enabled()) {
2420 thread->disable_stack_yellow_zone();
2421 }
2422 // Give us some room to process the exception
2423 thread->disable_register_stack_guard();
2424 // Update GR7 with the new limit so we can continue running
2425 // compiled code.
2426 exceptionInfo->ContextRecord->IntS3 =
2427 (ULONGLONG)thread->register_stack_limit();
2428 return Handle_Exception(exceptionInfo,
2429 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2430 } else {
2431 //
2432 // Check for implicit null
2433 // We only expect null pointers in the stubs (vtable)
2434 // the rest are checked explicitly now.
2435 //
2436 if (((uintptr_t)addr) < os::vm_page_size() ) {
2437 // an access to the first page of VM--assume it is a null pointer
2438 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2439 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2440 }
2441 }
2442 } // in_java
2443
2444 // IA64 doesn't use implicit null checking yet. So we shouldn't
2445 // get here.
2446 tty->print_raw_cr("Access violation, possible null pointer exception");
2447 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2448 exceptionInfo->ContextRecord);
2449 return EXCEPTION_CONTINUE_SEARCH;
2450 #else /* !IA64 */
2451
2452 // Windows 98 reports faulting addresses incorrectly
2453 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2454 !os::win32::is_nt()) {
2455 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2456 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2457 }
2458 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2459 exceptionInfo->ContextRecord);
2460 return EXCEPTION_CONTINUE_SEARCH;
2461 #endif
2462 }
2463 }
2464 }
2465
2466 #ifdef _WIN64
2467 // Special care for fast JNI field accessors.
2468 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2469 // in and the heap gets shrunk before the field access.
2470 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2471 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2472 if (addr != (address)-1) {
2473 return Handle_Exception(exceptionInfo, addr);
2474 }
2475 }
2476 #endif
2477
2478 // Stack overflow or null pointer exception in native code.
2479 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2480 exceptionInfo->ContextRecord);
2481 return EXCEPTION_CONTINUE_SEARCH;
2482 }
2483
2484 if (in_java) {
2485 switch (exception_code) {
2486 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2487 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2488
2489 case EXCEPTION_INT_OVERFLOW:
2490 return Handle_IDiv_Exception(exceptionInfo);
2491
2492 } // switch
2493 }
2494 #ifndef _WIN64
2495 if (((thread->thread_state() == _thread_in_Java) ||
2496 (thread->thread_state() == _thread_in_native)) &&
2497 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2498 {
2499 LONG result=Handle_FLT_Exception(exceptionInfo);
2500 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2501 }
2502 #endif //_WIN64
2503 }
2504
2505 if (exception_code != EXCEPTION_BREAKPOINT) {
2506 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2507 exceptionInfo->ContextRecord);
2508 }
2509 return EXCEPTION_CONTINUE_SEARCH;
2510 }
2511
2512 #ifndef _WIN64
2513 // Special care for fast JNI accessors.
2514 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2515 // the heap gets shrunk before the field access.
2516 // Need to install our own structured exception handler since native code may
2517 // install its own.
2518 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2519 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2520 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2521 address pc = (address) exceptionInfo->ContextRecord->Eip;
2522 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2523 if (addr != (address)-1) {
2524 return Handle_Exception(exceptionInfo, addr);
2525 }
2526 }
2527 return EXCEPTION_CONTINUE_SEARCH;
2528 }
2529
2530 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2531 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2532 __try { \
2533 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2534 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2535 } \
2536 return 0; \
2537 }
2538
2539 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2540 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2541 DEFINE_FAST_GETFIELD(jchar, char, Char)
2542 DEFINE_FAST_GETFIELD(jshort, short, Short)
2543 DEFINE_FAST_GETFIELD(jint, int, Int)
2544 DEFINE_FAST_GETFIELD(jlong, long, Long)
2545 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2546 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2547
2548 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2549 switch (type) {
2550 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2551 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2552 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2553 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2554 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2555 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2556 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2557 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2558 default: ShouldNotReachHere();
2559 }
2560 return (address)-1;
2561 }
2562 #endif
2563
2564 // Virtual Memory
2565
2566 int os::vm_page_size() { return os::win32::vm_page_size(); }
2567 int os::vm_allocation_granularity() {
2568 return os::win32::vm_allocation_granularity();
2569 }
2570
2571 // Windows large page support is available on Windows 2003. In order to use
2572 // large page memory, the administrator must first assign additional privilege
2573 // to the user:
2574 // + select Control Panel -> Administrative Tools -> Local Security Policy
2575 // + select Local Policies -> User Rights Assignment
2576 // + double click "Lock pages in memory", add users and/or groups
2577 // + reboot
2578 // Note the above steps are needed for administrator as well, as administrators
2579 // by default do not have the privilege to lock pages in memory.
2580 //
2581 // Note about Windows 2003: although the API supports committing large page
2582 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2583 // scenario, I found through experiment it only uses large page if the entire
2584 // memory region is reserved and committed in a single VirtualAlloc() call.
2585 // This makes Windows large page support more or less like Solaris ISM, in
2586 // that the entire heap must be committed upfront. This probably will change
2587 // in the future, if so the code below needs to be revisited.
2588
2589 #ifndef MEM_LARGE_PAGES
2590 #define MEM_LARGE_PAGES 0x20000000
2591 #endif
2592
2593 static HANDLE _hProcess;
2594 static HANDLE _hToken;
2595
2596 // Container for NUMA node list info
2597 class NUMANodeListHolder {
2598 private:
2599 int *_numa_used_node_list; // allocated below
2600 int _numa_used_node_count;
2601
2602 void free_node_list() {
2603 if (_numa_used_node_list != NULL) {
2604 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2605 }
2606 }
2607
2608 public:
2609 NUMANodeListHolder() {
2610 _numa_used_node_count = 0;
2611 _numa_used_node_list = NULL;
2612 // do rest of initialization in build routine (after function pointers are set up)
2613 }
2614
2615 ~NUMANodeListHolder() {
2616 free_node_list();
2617 }
2618
2619 bool build() {
2620 DWORD_PTR proc_aff_mask;
2621 DWORD_PTR sys_aff_mask;
2622 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2623 ULONG highest_node_number;
2624 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2625 free_node_list();
2626 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2627 for (unsigned int i = 0; i <= highest_node_number; i++) {
2628 ULONGLONG proc_mask_numa_node;
2629 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2630 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2631 _numa_used_node_list[_numa_used_node_count++] = i;
2632 }
2633 }
2634 return (_numa_used_node_count > 1);
2635 }
2636
2637 int get_count() {return _numa_used_node_count;}
2638 int get_node_list_entry(int n) {
2639 // for indexes out of range, returns -1
2640 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2641 }
2642
2643 } numa_node_list_holder;
2644
2645
2646
2647 static size_t _large_page_size = 0;
2648
2649 static bool resolve_functions_for_large_page_init() {
2650 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2651 os::Advapi32Dll::AdvapiAvailable();
2652 }
2653
2654 static bool request_lock_memory_privilege() {
2655 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2656 os::current_process_id());
2657
2658 LUID luid;
2659 if (_hProcess != NULL &&
2660 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2661 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2662
2663 TOKEN_PRIVILEGES tp;
2664 tp.PrivilegeCount = 1;
2665 tp.Privileges[0].Luid = luid;
2666 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2667
2668 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2669 // privilege. Check GetLastError() too. See MSDN document.
2670 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2671 (GetLastError() == ERROR_SUCCESS)) {
2672 return true;
2673 }
2674 }
2675
2676 return false;
2677 }
2678
2679 static void cleanup_after_large_page_init() {
2680 if (_hProcess) CloseHandle(_hProcess);
2681 _hProcess = NULL;
2682 if (_hToken) CloseHandle(_hToken);
2683 _hToken = NULL;
2684 }
2685
2686 static bool numa_interleaving_init() {
2687 bool success = false;
2688 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2689
2690 // print a warning if UseNUMAInterleaving flag is specified on command line
2691 bool warn_on_failure = use_numa_interleaving_specified;
2692 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2693
2694 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2695 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2696 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2697
2698 if (os::Kernel32Dll::NumaCallsAvailable()) {
2699 if (numa_node_list_holder.build()) {
2700 if (PrintMiscellaneous && Verbose) {
2701 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2702 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2703 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2704 }
2705 tty->print("\n");
2706 }
2707 success = true;
2708 } else {
2709 WARN("Process does not cover multiple NUMA nodes.");
2710 }
2711 } else {
2712 WARN("NUMA Interleaving is not supported by the operating system.");
2713 }
2714 if (!success) {
2715 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2716 }
2717 return success;
2718 #undef WARN
2719 }
2720
2721 // this routine is used whenever we need to reserve a contiguous VA range
2722 // but we need to make separate VirtualAlloc calls for each piece of the range
2723 // Reasons for doing this:
2724 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2725 // * UseNUMAInterleaving requires a separate node for each piece
2726 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2727 bool should_inject_error=false) {
2728 char * p_buf;
2729 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2730 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2731 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2732
2733 // first reserve enough address space in advance since we want to be
2734 // able to break a single contiguous virtual address range into multiple
2735 // large page commits but WS2003 does not allow reserving large page space
2736 // so we just use 4K pages for reserve, this gives us a legal contiguous
2737 // address space. then we will deallocate that reservation, and re alloc
2738 // using large pages
2739 const size_t size_of_reserve = bytes + chunk_size;
2740 if (bytes > size_of_reserve) {
2741 // Overflowed.
2742 return NULL;
2743 }
2744 p_buf = (char *) VirtualAlloc(addr,
2745 size_of_reserve, // size of Reserve
2746 MEM_RESERVE,
2747 PAGE_READWRITE);
2748 // If reservation failed, return NULL
2749 if (p_buf == NULL) return NULL;
2750
2751 os::release_memory(p_buf, bytes + chunk_size);
2752
2753 // we still need to round up to a page boundary (in case we are using large pages)
2754 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2755 // instead we handle this in the bytes_to_rq computation below
2756 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2757
2758 // now go through and allocate one chunk at a time until all bytes are
2759 // allocated
2760 size_t bytes_remaining = bytes;
2761 // An overflow of align_size_up() would have been caught above
2762 // in the calculation of size_of_reserve.
2763 char * next_alloc_addr = p_buf;
2764 HANDLE hProc = GetCurrentProcess();
2765
2766 #ifdef ASSERT
2767 // Variable for the failure injection
2768 long ran_num = os::random();
2769 size_t fail_after = ran_num % bytes;
2770 #endif
2771
2772 int count=0;
2773 while (bytes_remaining) {
2774 // select bytes_to_rq to get to the next chunk_size boundary
2775
2776 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2777 // Note allocate and commit
2778 char * p_new;
2779
2780 #ifdef ASSERT
2781 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2782 #else
2783 const bool inject_error_now = false;
2784 #endif
2785
2786 if (inject_error_now) {
2787 p_new = NULL;
2788 } else {
2789 if (!UseNUMAInterleaving) {
2790 p_new = (char *) VirtualAlloc(next_alloc_addr,
2791 bytes_to_rq,
2792 flags,
2793 prot);
2794 } else {
2795 // get the next node to use from the used_node_list
2796 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2797 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2798 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2799 next_alloc_addr,
2800 bytes_to_rq,
2801 flags,
2802 prot,
2803 node);
2804 }
2805 }
2806
2807 if (p_new == NULL) {
2808 // Free any allocated pages
2809 if (next_alloc_addr > p_buf) {
2810 // Some memory was committed so release it.
2811 size_t bytes_to_release = bytes - bytes_remaining;
2812 os::release_memory(p_buf, bytes_to_release);
2813 }
2814 #ifdef ASSERT
2815 if (should_inject_error) {
2816 if (TracePageSizes && Verbose) {
2817 tty->print_cr("Reserving pages individually failed.");
2818 }
2819 }
2820 #endif
2821 return NULL;
2822 }
2823 bytes_remaining -= bytes_to_rq;
2824 next_alloc_addr += bytes_to_rq;
2825 count++;
2826 }
2827 // made it this far, success
2828 return p_buf;
2829 }
2830
2831
2832
2833 void os::large_page_init() {
2834 if (!UseLargePages) return;
2835
2836 // print a warning if any large page related flag is specified on command line
2837 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2838 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2839 bool success = false;
2840
2841 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2842 if (resolve_functions_for_large_page_init()) {
2843 if (request_lock_memory_privilege()) {
2844 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2845 if (s) {
2846 #if defined(IA32) || defined(AMD64)
2847 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2848 WARN("JVM cannot use large pages bigger than 4mb.");
2849 } else {
2850 #endif
2851 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2852 _large_page_size = LargePageSizeInBytes;
2853 } else {
2854 _large_page_size = s;
2855 }
2856 success = true;
2857 #if defined(IA32) || defined(AMD64)
2858 }
2859 #endif
2860 } else {
2861 WARN("Large page is not supported by the processor.");
2862 }
2863 } else {
2864 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2865 }
2866 } else {
2867 WARN("Large page is not supported by the operating system.");
2868 }
2869 #undef WARN
2870
2871 const size_t default_page_size = (size_t) vm_page_size();
2872 if (success && _large_page_size > default_page_size) {
2873 _page_sizes[0] = _large_page_size;
2874 _page_sizes[1] = default_page_size;
2875 _page_sizes[2] = 0;
2876 }
2877
2878 cleanup_after_large_page_init();
2879 UseLargePages = success;
2880 }
2881
2882 // On win32, one cannot release just a part of reserved memory, it's an
2883 // all or nothing deal. When we split a reservation, we must break the
2884 // reservation into two reservations.
2885 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2886 bool realloc) {
2887 if (size > 0) {
2888 release_memory(base, size);
2889 if (realloc) {
2890 reserve_memory(split, base);
2891 }
2892 if (size != split) {
2893 reserve_memory(size - split, base + split);
2894 }
2895 }
2896 }
2897
2898 char* os::reserve_memory_aligned(size_t bytes, size_t alignment) {
2899 size_t size = align_size_up(bytes, alignment);
2900 size_t extra_size = size + alignment;
2901 char* aligned_base = NULL;
2902
2903 do {
2904 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
2905 if (extra_base == NULL) {
2906 return NULL;
2907 }
2908 // Do manual alignment
2909 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
2910
2911 os::release_memory(extra_base, extra_size);
2912
2913 aligned_base = os::reserve_memory(size, aligned_base);
2914
2915 } while (aligned_base == NULL);
2916
2917 return aligned_base;
2918 }
2919
2920 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2921 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2922 "reserve alignment");
2923 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2924 char* res;
2925 // note that if UseLargePages is on, all the areas that require interleaving
2926 // will go thru reserve_memory_special rather than thru here.
2927 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
2928 if (!use_individual) {
2929 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2930 } else {
2931 elapsedTimer reserveTimer;
2932 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
2933 // in numa interleaving, we have to allocate pages individually
2934 // (well really chunks of NUMAInterleaveGranularity size)
2935 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
2936 if (res == NULL) {
2937 warning("NUMA page allocation failed");
2938 }
2939 if( Verbose && PrintMiscellaneous ) {
2940 reserveTimer.stop();
2941 tty->print_cr("reserve_memory of %Ix bytes took %ld ms (%ld ticks)", bytes,
2942 reserveTimer.milliseconds(), reserveTimer.ticks());
2943 }
2944 }
2945 assert(res == NULL || addr == NULL || addr == res,
2946 "Unexpected address from reserve.");
2947
2948 return res;
2949 }
2950
2951 // Reserve memory at an arbitrary address, only if that area is
2952 // available (and not reserved for something else).
2953 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2954 // Windows os::reserve_memory() fails of the requested address range is
2955 // not avilable.
2956 return reserve_memory(bytes, requested_addr);
2957 }
2958
2959 size_t os::large_page_size() {
2960 return _large_page_size;
2961 }
2962
2963 bool os::can_commit_large_page_memory() {
2964 // Windows only uses large page memory when the entire region is reserved
2965 // and committed in a single VirtualAlloc() call. This may change in the
2966 // future, but with Windows 2003 it's not possible to commit on demand.
2967 return false;
2968 }
2969
2970 bool os::can_execute_large_page_memory() {
2971 return true;
2972 }
2973
2974 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2975
2976 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2977 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2978
2979 // with large pages, there are two cases where we need to use Individual Allocation
2980 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
2981 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
2982 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
2983 if (TracePageSizes && Verbose) {
2984 tty->print_cr("Reserving large pages individually.");
2985 }
2986 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
2987 if (p_buf == NULL) {
2988 // give an appropriate warning message
2989 if (UseNUMAInterleaving) {
2990 warning("NUMA large page allocation failed, UseLargePages flag ignored");
2991 }
2992 if (UseLargePagesIndividualAllocation) {
2993 warning("Individually allocated large pages failed, "
2994 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2995 }
2996 return NULL;
2997 }
2998
2999 return p_buf;
3000
3001 } else {
3002 // normal policy just allocate it all at once
3003 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3004 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3005 return res;
3006 }
3007 }
3008
3009 bool os::release_memory_special(char* base, size_t bytes) {
3010 return release_memory(base, bytes);
3011 }
3012
3013 void os::print_statistics() {
3014 }
3015
3016 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3017 if (bytes == 0) {
3018 // Don't bother the OS with noops.
3019 return true;
3020 }
3021 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3022 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3023 // Don't attempt to print anything if the OS call fails. We're
3024 // probably low on resources, so the print itself may cause crashes.
3025
3026 // unless we have NUMAInterleaving enabled, the range of a commit
3027 // is always within a reserve covered by a single VirtualAlloc
3028 // in that case we can just do a single commit for the requested size
3029 if (!UseNUMAInterleaving) {
3030 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3031 if (exec) {
3032 DWORD oldprot;
3033 // Windows doc says to use VirtualProtect to get execute permissions
3034 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3035 }
3036 return true;
3037 } else {
3038
3039 // when NUMAInterleaving is enabled, the commit might cover a range that
3040 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3041 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3042 // returns represents the number of bytes that can be committed in one step.
3043 size_t bytes_remaining = bytes;
3044 char * next_alloc_addr = addr;
3045 while (bytes_remaining > 0) {
3046 MEMORY_BASIC_INFORMATION alloc_info;
3047 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3048 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3049 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3050 return false;
3051 if (exec) {
3052 DWORD oldprot;
3053 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3054 return false;
3055 }
3056 bytes_remaining -= bytes_to_rq;
3057 next_alloc_addr += bytes_to_rq;
3058 }
3059 }
3060 // if we made it this far, return true
3061 return true;
3062 }
3063
3064 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3065 bool exec) {
3066 return commit_memory(addr, size, exec);
3067 }
3068
3069 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3070 if (bytes == 0) {
3071 // Don't bother the OS with noops.
3072 return true;
3073 }
3074 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3075 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3076 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3077 }
3078
3079 bool os::pd_release_memory(char* addr, size_t bytes) {
3080 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3081 }
3082
3083 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3084 return os::commit_memory(addr, size);
3085 }
3086
3087 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3088 return os::uncommit_memory(addr, size);
3089 }
3090
3091 // Set protections specified
3092 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3093 bool is_committed) {
3094 unsigned int p = 0;
3095 switch (prot) {
3096 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3097 case MEM_PROT_READ: p = PAGE_READONLY; break;
3098 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3099 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3100 default:
3101 ShouldNotReachHere();
3102 }
3103
3104 DWORD old_status;
3105
3106 // Strange enough, but on Win32 one can change protection only for committed
3107 // memory, not a big deal anyway, as bytes less or equal than 64K
3108 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3109 fatal("cannot commit protection page");
3110 }
3111 // One cannot use os::guard_memory() here, as on Win32 guard page
3112 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3113 //
3114 // Pages in the region become guard pages. Any attempt to access a guard page
3115 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3116 // the guard page status. Guard pages thus act as a one-time access alarm.
3117 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3118 }
3119
3120 bool os::guard_memory(char* addr, size_t bytes) {
3121 DWORD old_status;
3122 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3123 }
3124
3125 bool os::unguard_memory(char* addr, size_t bytes) {
3126 DWORD old_status;
3127 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3128 }
3129
3130 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3131 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3132 void os::numa_make_global(char *addr, size_t bytes) { }
3133 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3134 bool os::numa_topology_changed() { return false; }
3135 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3136 int os::numa_get_group_id() { return 0; }
3137 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3138 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3139 // Provide an answer for UMA systems
3140 ids[0] = 0;
3141 return 1;
3142 } else {
3143 // check for size bigger than actual groups_num
3144 size = MIN2(size, numa_get_groups_num());
3145 for (int i = 0; i < (int)size; i++) {
3146 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3147 }
3148 return size;
3149 }
3150 }
3151
3152 bool os::get_page_info(char *start, page_info* info) {
3153 return false;
3154 }
3155
3156 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3157 return end;
3158 }
3159
3160 char* os::non_memory_address_word() {
3161 // Must never look like an address returned by reserve_memory,
3162 // even in its subfields (as defined by the CPU immediate fields,
3163 // if the CPU splits constants across multiple instructions).
3164 return (char*)-1;
3165 }
3166
3167 #define MAX_ERROR_COUNT 100
3168 #define SYS_THREAD_ERROR 0xffffffffUL
3169
3170 void os::pd_start_thread(Thread* thread) {
3171 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3172 // Returns previous suspend state:
3173 // 0: Thread was not suspended
3174 // 1: Thread is running now
3175 // >1: Thread is still suspended.
3176 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3177 }
3178
3179 class HighResolutionInterval {
3180 // The default timer resolution seems to be 10 milliseconds.
3181 // (Where is this written down?)
3182 // If someone wants to sleep for only a fraction of the default,
3183 // then we set the timer resolution down to 1 millisecond for
3184 // the duration of their interval.
3185 // We carefully set the resolution back, since otherwise we
3186 // seem to incur an overhead (3%?) that we don't need.
3187 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3188 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3189 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3190 // timeBeginPeriod() if the relative error exceeded some threshold.
3191 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3192 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3193 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3194 // resolution timers running.
3195 private:
3196 jlong resolution;
3197 public:
3198 HighResolutionInterval(jlong ms) {
3199 resolution = ms % 10L;
3200 if (resolution != 0) {
3201 MMRESULT result = timeBeginPeriod(1L);
3202 }
3203 }
3204 ~HighResolutionInterval() {
3205 if (resolution != 0) {
3206 MMRESULT result = timeEndPeriod(1L);
3207 }
3208 resolution = 0L;
3209 }
3210 };
3211
3212 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3213 jlong limit = (jlong) MAXDWORD;
3214
3215 while(ms > limit) {
3216 int res;
3217 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3218 return res;
3219 ms -= limit;
3220 }
3221
3222 assert(thread == Thread::current(), "thread consistency check");
3223 OSThread* osthread = thread->osthread();
3224 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3225 int result;
3226 if (interruptable) {
3227 assert(thread->is_Java_thread(), "must be java thread");
3228 JavaThread *jt = (JavaThread *) thread;
3229 ThreadBlockInVM tbivm(jt);
3230
3231 jt->set_suspend_equivalent();
3232 // cleared by handle_special_suspend_equivalent_condition() or
3233 // java_suspend_self() via check_and_wait_while_suspended()
3234
3235 HANDLE events[1];
3236 events[0] = osthread->interrupt_event();
3237 HighResolutionInterval *phri=NULL;
3238 if(!ForceTimeHighResolution)
3239 phri = new HighResolutionInterval( ms );
3240 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3241 result = OS_TIMEOUT;
3242 } else {
3243 ResetEvent(osthread->interrupt_event());
3244 osthread->set_interrupted(false);
3245 result = OS_INTRPT;
3246 }
3247 delete phri; //if it is NULL, harmless
3248
3249 // were we externally suspended while we were waiting?
3250 jt->check_and_wait_while_suspended();
3251 } else {
3252 assert(!thread->is_Java_thread(), "must not be java thread");
3253 Sleep((long) ms);
3254 result = OS_TIMEOUT;
3255 }
3256 return result;
3257 }
3258
3259 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3260 void os::infinite_sleep() {
3261 while (true) { // sleep forever ...
3262 Sleep(100000); // ... 100 seconds at a time
3263 }
3264 }
3265
3266 typedef BOOL (WINAPI * STTSignature)(void) ;
3267
3268 os::YieldResult os::NakedYield() {
3269 // Use either SwitchToThread() or Sleep(0)
3270 // Consider passing back the return value from SwitchToThread().
3271 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3272 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3273 } else {
3274 Sleep(0);
3275 }
3276 return os::YIELD_UNKNOWN ;
3277 }
3278
3279 void os::yield() { os::NakedYield(); }
3280
3281 void os::yield_all(int attempts) {
3282 // Yields to all threads, including threads with lower priorities
3283 Sleep(1);
3284 }
3285
3286 // Win32 only gives you access to seven real priorities at a time,
3287 // so we compress Java's ten down to seven. It would be better
3288 // if we dynamically adjusted relative priorities.
3289
3290 int os::java_to_os_priority[CriticalPriority + 1] = {
3291 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3292 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3293 THREAD_PRIORITY_LOWEST, // 2
3294 THREAD_PRIORITY_BELOW_NORMAL, // 3
3295 THREAD_PRIORITY_BELOW_NORMAL, // 4
3296 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3297 THREAD_PRIORITY_NORMAL, // 6
3298 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3299 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3300 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3301 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3302 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3303 };
3304
3305 int prio_policy1[CriticalPriority + 1] = {
3306 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3307 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3308 THREAD_PRIORITY_LOWEST, // 2
3309 THREAD_PRIORITY_BELOW_NORMAL, // 3
3310 THREAD_PRIORITY_BELOW_NORMAL, // 4
3311 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3312 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3313 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3314 THREAD_PRIORITY_HIGHEST, // 8
3315 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3316 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3317 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3318 };
3319
3320 static int prio_init() {
3321 // If ThreadPriorityPolicy is 1, switch tables
3322 if (ThreadPriorityPolicy == 1) {
3323 int i;
3324 for (i = 0; i < CriticalPriority + 1; i++) {
3325 os::java_to_os_priority[i] = prio_policy1[i];
3326 }
3327 }
3328 if (UseCriticalJavaThreadPriority) {
3329 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3330 }
3331 return 0;
3332 }
3333
3334 OSReturn os::set_native_priority(Thread* thread, int priority) {
3335 if (!UseThreadPriorities) return OS_OK;
3336 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3337 return ret ? OS_OK : OS_ERR;
3338 }
3339
3340 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3341 if ( !UseThreadPriorities ) {
3342 *priority_ptr = java_to_os_priority[NormPriority];
3343 return OS_OK;
3344 }
3345 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3346 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3347 assert(false, "GetThreadPriority failed");
3348 return OS_ERR;
3349 }
3350 *priority_ptr = os_prio;
3351 return OS_OK;
3352 }
3353
3354
3355 // Hint to the underlying OS that a task switch would not be good.
3356 // Void return because it's a hint and can fail.
3357 void os::hint_no_preempt() {}
3358
3359 void os::interrupt(Thread* thread) {
3360 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3361 "possibility of dangling Thread pointer");
3362
3363 OSThread* osthread = thread->osthread();
3364 osthread->set_interrupted(true);
3365 // More than one thread can get here with the same value of osthread,
3366 // resulting in multiple notifications. We do, however, want the store
3367 // to interrupted() to be visible to other threads before we post
3368 // the interrupt event.
3369 OrderAccess::release();
3370 SetEvent(osthread->interrupt_event());
3371 // For JSR166: unpark after setting status
3372 if (thread->is_Java_thread())
3373 ((JavaThread*)thread)->parker()->unpark();
3374
3375 ParkEvent * ev = thread->_ParkEvent ;
3376 if (ev != NULL) ev->unpark() ;
3377
3378 }
3379
3380
3381 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3382 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3383 "possibility of dangling Thread pointer");
3384
3385 OSThread* osthread = thread->osthread();
3386 bool interrupted = osthread->interrupted();
3387 // There is no synchronization between the setting of the interrupt
3388 // and it being cleared here. It is critical - see 6535709 - that
3389 // we only clear the interrupt state, and reset the interrupt event,
3390 // if we are going to report that we were indeed interrupted - else
3391 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3392 // depending on the timing
3393 if (interrupted && clear_interrupted) {
3394 osthread->set_interrupted(false);
3395 ResetEvent(osthread->interrupt_event());
3396 } // Otherwise leave the interrupted state alone
3397
3398 return interrupted;
3399 }
3400
3401 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3402 ExtendedPC os::get_thread_pc(Thread* thread) {
3403 CONTEXT context;
3404 context.ContextFlags = CONTEXT_CONTROL;
3405 HANDLE handle = thread->osthread()->thread_handle();
3406 #ifdef _M_IA64
3407 assert(0, "Fix get_thread_pc");
3408 return ExtendedPC(NULL);
3409 #else
3410 if (GetThreadContext(handle, &context)) {
3411 #ifdef _M_AMD64
3412 return ExtendedPC((address) context.Rip);
3413 #else
3414 return ExtendedPC((address) context.Eip);
3415 #endif
3416 } else {
3417 return ExtendedPC(NULL);
3418 }
3419 #endif
3420 }
3421
3422 // GetCurrentThreadId() returns DWORD
3423 intx os::current_thread_id() { return GetCurrentThreadId(); }
3424
3425 static int _initial_pid = 0;
3426
3427 int os::current_process_id()
3428 {
3429 return (_initial_pid ? _initial_pid : _getpid());
3430 }
3431
3432 int os::win32::_vm_page_size = 0;
3433 int os::win32::_vm_allocation_granularity = 0;
3434 int os::win32::_processor_type = 0;
3435 // Processor level is not available on non-NT systems, use vm_version instead
3436 int os::win32::_processor_level = 0;
3437 julong os::win32::_physical_memory = 0;
3438 size_t os::win32::_default_stack_size = 0;
3439
3440 intx os::win32::_os_thread_limit = 0;
3441 volatile intx os::win32::_os_thread_count = 0;
3442
3443 bool os::win32::_is_nt = false;
3444 bool os::win32::_is_windows_2003 = false;
3445 bool os::win32::_is_windows_server = false;
3446
3447 void os::win32::initialize_system_info() {
3448 SYSTEM_INFO si;
3449 GetSystemInfo(&si);
3450 _vm_page_size = si.dwPageSize;
3451 _vm_allocation_granularity = si.dwAllocationGranularity;
3452 _processor_type = si.dwProcessorType;
3453 _processor_level = si.wProcessorLevel;
3454 set_processor_count(si.dwNumberOfProcessors);
3455
3456 MEMORYSTATUSEX ms;
3457 ms.dwLength = sizeof(ms);
3458
3459 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3460 // dwMemoryLoad (% of memory in use)
3461 GlobalMemoryStatusEx(&ms);
3462 _physical_memory = ms.ullTotalPhys;
3463
3464 OSVERSIONINFOEX oi;
3465 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3466 GetVersionEx((OSVERSIONINFO*)&oi);
3467 switch(oi.dwPlatformId) {
3468 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3469 case VER_PLATFORM_WIN32_NT:
3470 _is_nt = true;
3471 {
3472 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3473 if (os_vers == 5002) {
3474 _is_windows_2003 = true;
3475 }
3476 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3477 oi.wProductType == VER_NT_SERVER) {
3478 _is_windows_server = true;
3479 }
3480 }
3481 break;
3482 default: fatal("Unknown platform");
3483 }
3484
3485 _default_stack_size = os::current_stack_size();
3486 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3487 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3488 "stack size not a multiple of page size");
3489
3490 initialize_performance_counter();
3491
3492 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3493 // known to deadlock the system, if the VM issues to thread operations with
3494 // a too high frequency, e.g., such as changing the priorities.
3495 // The 6000 seems to work well - no deadlocks has been notices on the test
3496 // programs that we have seen experience this problem.
3497 if (!os::win32::is_nt()) {
3498 StarvationMonitorInterval = 6000;
3499 }
3500 }
3501
3502
3503 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3504 char path[MAX_PATH];
3505 DWORD size;
3506 DWORD pathLen = (DWORD)sizeof(path);
3507 HINSTANCE result = NULL;
3508
3509 // only allow library name without path component
3510 assert(strchr(name, '\\') == NULL, "path not allowed");
3511 assert(strchr(name, ':') == NULL, "path not allowed");
3512 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3513 jio_snprintf(ebuf, ebuflen,
3514 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3515 return NULL;
3516 }
3517
3518 // search system directory
3519 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3520 strcat(path, "\\");
3521 strcat(path, name);
3522 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3523 return result;
3524 }
3525 }
3526
3527 // try Windows directory
3528 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3529 strcat(path, "\\");
3530 strcat(path, name);
3531 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3532 return result;
3533 }
3534 }
3535
3536 jio_snprintf(ebuf, ebuflen,
3537 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3538 return NULL;
3539 }
3540
3541 void os::win32::setmode_streams() {
3542 _setmode(_fileno(stdin), _O_BINARY);
3543 _setmode(_fileno(stdout), _O_BINARY);
3544 _setmode(_fileno(stderr), _O_BINARY);
3545 }
3546
3547
3548 bool os::is_debugger_attached() {
3549 return IsDebuggerPresent() ? true : false;
3550 }
3551
3552
3553 void os::wait_for_keypress_at_exit(void) {
3554 if (PauseAtExit) {
3555 fprintf(stderr, "Press any key to continue...\n");
3556 fgetc(stdin);
3557 }
3558 }
3559
3560
3561 int os::message_box(const char* title, const char* message) {
3562 int result = MessageBox(NULL, message, title,
3563 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3564 return result == IDYES;
3565 }
3566
3567 int os::allocate_thread_local_storage() {
3568 return TlsAlloc();
3569 }
3570
3571
3572 void os::free_thread_local_storage(int index) {
3573 TlsFree(index);
3574 }
3575
3576
3577 void os::thread_local_storage_at_put(int index, void* value) {
3578 TlsSetValue(index, value);
3579 assert(thread_local_storage_at(index) == value, "Just checking");
3580 }
3581
3582
3583 void* os::thread_local_storage_at(int index) {
3584 return TlsGetValue(index);
3585 }
3586
3587
3588 #ifndef PRODUCT
3589 #ifndef _WIN64
3590 // Helpers to check whether NX protection is enabled
3591 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3592 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3593 pex->ExceptionRecord->NumberParameters > 0 &&
3594 pex->ExceptionRecord->ExceptionInformation[0] ==
3595 EXCEPTION_INFO_EXEC_VIOLATION) {
3596 return EXCEPTION_EXECUTE_HANDLER;
3597 }
3598 return EXCEPTION_CONTINUE_SEARCH;
3599 }
3600
3601 void nx_check_protection() {
3602 // If NX is enabled we'll get an exception calling into code on the stack
3603 char code[] = { (char)0xC3 }; // ret
3604 void *code_ptr = (void *)code;
3605 __try {
3606 __asm call code_ptr
3607 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3608 tty->print_raw_cr("NX protection detected.");
3609 }
3610 }
3611 #endif // _WIN64
3612 #endif // PRODUCT
3613
3614 // this is called _before_ the global arguments have been parsed
3615 void os::init(void) {
3616 _initial_pid = _getpid();
3617
3618 init_random(1234567);
3619
3620 win32::initialize_system_info();
3621 win32::setmode_streams();
3622 init_page_sizes((size_t) win32::vm_page_size());
3623
3624 // For better scalability on MP systems (must be called after initialize_system_info)
3625 #ifndef PRODUCT
3626 if (is_MP()) {
3627 NoYieldsInMicrolock = true;
3628 }
3629 #endif
3630 // This may be overridden later when argument processing is done.
3631 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3632 os::win32::is_windows_2003());
3633
3634 // Initialize main_process and main_thread
3635 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3636 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3637 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3638 fatal("DuplicateHandle failed\n");
3639 }
3640 main_thread_id = (int) GetCurrentThreadId();
3641 }
3642
3643 // To install functions for atexit processing
3644 extern "C" {
3645 static void perfMemory_exit_helper() {
3646 perfMemory_exit();
3647 }
3648 }
3649
3650 // this is called _after_ the global arguments have been parsed
3651 jint os::init_2(void) {
3652 // Allocate a single page and mark it as readable for safepoint polling
3653 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3654 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3655
3656 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3657 guarantee( return_page != NULL, "Commit Failed for polling page");
3658
3659 os::set_polling_page( polling_page );
3660
3661 #ifndef PRODUCT
3662 if( Verbose && PrintMiscellaneous )
3663 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3664 #endif
3665
3666 if (!UseMembar) {
3667 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3668 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3669
3670 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3671 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3672
3673 os::set_memory_serialize_page( mem_serialize_page );
3674
3675 #ifndef PRODUCT
3676 if(Verbose && PrintMiscellaneous)
3677 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3678 #endif
3679 }
3680
3681 os::large_page_init();
3682
3683 // Setup Windows Exceptions
3684
3685 // for debugging float code generation bugs
3686 if (ForceFloatExceptions) {
3687 #ifndef _WIN64
3688 static long fp_control_word = 0;
3689 __asm { fstcw fp_control_word }
3690 // see Intel PPro Manual, Vol. 2, p 7-16
3691 const long precision = 0x20;
3692 const long underflow = 0x10;
3693 const long overflow = 0x08;
3694 const long zero_div = 0x04;
3695 const long denorm = 0x02;
3696 const long invalid = 0x01;
3697 fp_control_word |= invalid;
3698 __asm { fldcw fp_control_word }
3699 #endif
3700 }
3701
3702 // If stack_commit_size is 0, windows will reserve the default size,
3703 // but only commit a small portion of it.
3704 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3705 size_t default_reserve_size = os::win32::default_stack_size();
3706 size_t actual_reserve_size = stack_commit_size;
3707 if (stack_commit_size < default_reserve_size) {
3708 // If stack_commit_size == 0, we want this too
3709 actual_reserve_size = default_reserve_size;
3710 }
3711
3712 // Check minimum allowable stack size for thread creation and to initialize
3713 // the java system classes, including StackOverflowError - depends on page
3714 // size. Add a page for compiler2 recursion in main thread.
3715 // Add in 2*BytesPerWord times page size to account for VM stack during
3716 // class initialization depending on 32 or 64 bit VM.
3717 size_t min_stack_allowed =
3718 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3719 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3720 if (actual_reserve_size < min_stack_allowed) {
3721 tty->print_cr("\nThe stack size specified is too small, "
3722 "Specify at least %dk",
3723 min_stack_allowed / K);
3724 return JNI_ERR;
3725 }
3726
3727 JavaThread::set_stack_size_at_create(stack_commit_size);
3728
3729 // Calculate theoretical max. size of Threads to guard gainst artifical
3730 // out-of-memory situations, where all available address-space has been
3731 // reserved by thread stacks.
3732 assert(actual_reserve_size != 0, "Must have a stack");
3733
3734 // Calculate the thread limit when we should start doing Virtual Memory
3735 // banging. Currently when the threads will have used all but 200Mb of space.
3736 //
3737 // TODO: consider performing a similar calculation for commit size instead
3738 // as reserve size, since on a 64-bit platform we'll run into that more
3739 // often than running out of virtual memory space. We can use the
3740 // lower value of the two calculations as the os_thread_limit.
3741 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3742 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3743
3744 // at exit methods are called in the reverse order of their registration.
3745 // there is no limit to the number of functions registered. atexit does
3746 // not set errno.
3747
3748 if (PerfAllowAtExitRegistration) {
3749 // only register atexit functions if PerfAllowAtExitRegistration is set.
3750 // atexit functions can be delayed until process exit time, which
3751 // can be problematic for embedded VM situations. Embedded VMs should
3752 // call DestroyJavaVM() to assure that VM resources are released.
3753
3754 // note: perfMemory_exit_helper atexit function may be removed in
3755 // the future if the appropriate cleanup code can be added to the
3756 // VM_Exit VMOperation's doit method.
3757 if (atexit(perfMemory_exit_helper) != 0) {
3758 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3759 }
3760 }
3761
3762 #ifndef _WIN64
3763 // Print something if NX is enabled (win32 on AMD64)
3764 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3765 #endif
3766
3767 // initialize thread priority policy
3768 prio_init();
3769
3770 if (UseNUMA && !ForceNUMA) {
3771 UseNUMA = false; // We don't fully support this yet
3772 }
3773
3774 if (UseNUMAInterleaving) {
3775 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3776 bool success = numa_interleaving_init();
3777 if (!success) UseNUMAInterleaving = false;
3778 }
3779
3780 return JNI_OK;
3781 }
3782
3783 void os::init_3(void) {
3784 return;
3785 }
3786
3787 // Mark the polling page as unreadable
3788 void os::make_polling_page_unreadable(void) {
3789 DWORD old_status;
3790 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3791 fatal("Could not disable polling page");
3792 };
3793
3794 // Mark the polling page as readable
3795 void os::make_polling_page_readable(void) {
3796 DWORD old_status;
3797 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3798 fatal("Could not enable polling page");
3799 };
3800
3801
3802 int os::stat(const char *path, struct stat *sbuf) {
3803 char pathbuf[MAX_PATH];
3804 if (strlen(path) > MAX_PATH - 1) {
3805 errno = ENAMETOOLONG;
3806 return -1;
3807 }
3808 os::native_path(strcpy(pathbuf, path));
3809 int ret = ::stat(pathbuf, sbuf);
3810 if (sbuf != NULL && UseUTCFileTimestamp) {
3811 // Fix for 6539723. st_mtime returned from stat() is dependent on
3812 // the system timezone and so can return different values for the
3813 // same file if/when daylight savings time changes. This adjustment
3814 // makes sure the same timestamp is returned regardless of the TZ.
3815 //
3816 // See:
3817 // http://msdn.microsoft.com/library/
3818 // default.asp?url=/library/en-us/sysinfo/base/
3819 // time_zone_information_str.asp
3820 // and
3821 // http://msdn.microsoft.com/library/default.asp?url=
3822 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3823 //
3824 // NOTE: there is a insidious bug here: If the timezone is changed
3825 // after the call to stat() but before 'GetTimeZoneInformation()', then
3826 // the adjustment we do here will be wrong and we'll return the wrong
3827 // value (which will likely end up creating an invalid class data
3828 // archive). Absent a better API for this, or some time zone locking
3829 // mechanism, we'll have to live with this risk.
3830 TIME_ZONE_INFORMATION tz;
3831 DWORD tzid = GetTimeZoneInformation(&tz);
3832 int daylightBias =
3833 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3834 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3835 }
3836 return ret;
3837 }
3838
3839
3840 #define FT2INT64(ft) \
3841 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3842
3843
3844 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3845 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3846 // of a thread.
3847 //
3848 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3849 // the fast estimate available on the platform.
3850
3851 // current_thread_cpu_time() is not optimized for Windows yet
3852 jlong os::current_thread_cpu_time() {
3853 // return user + sys since the cost is the same
3854 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3855 }
3856
3857 jlong os::thread_cpu_time(Thread* thread) {
3858 // consistent with what current_thread_cpu_time() returns.
3859 return os::thread_cpu_time(thread, true /* user+sys */);
3860 }
3861
3862 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3863 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3864 }
3865
3866 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3867 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3868 // If this function changes, os::is_thread_cpu_time_supported() should too
3869 if (os::win32::is_nt()) {
3870 FILETIME CreationTime;
3871 FILETIME ExitTime;
3872 FILETIME KernelTime;
3873 FILETIME UserTime;
3874
3875 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3876 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3877 return -1;
3878 else
3879 if (user_sys_cpu_time) {
3880 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3881 } else {
3882 return FT2INT64(UserTime) * 100;
3883 }
3884 } else {
3885 return (jlong) timeGetTime() * 1000000;
3886 }
3887 }
3888
3889 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3890 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3891 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3892 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3893 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3894 }
3895
3896 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3897 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3898 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3899 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3900 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3901 }
3902
3903 bool os::is_thread_cpu_time_supported() {
3904 // see os::thread_cpu_time
3905 if (os::win32::is_nt()) {
3906 FILETIME CreationTime;
3907 FILETIME ExitTime;
3908 FILETIME KernelTime;
3909 FILETIME UserTime;
3910
3911 if ( GetThreadTimes(GetCurrentThread(),
3912 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3913 return false;
3914 else
3915 return true;
3916 } else {
3917 return false;
3918 }
3919 }
3920
3921 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3922 // It does have primitives (PDH API) to get CPU usage and run queue length.
3923 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3924 // If we wanted to implement loadavg on Windows, we have a few options:
3925 //
3926 // a) Query CPU usage and run queue length and "fake" an answer by
3927 // returning the CPU usage if it's under 100%, and the run queue
3928 // length otherwise. It turns out that querying is pretty slow
3929 // on Windows, on the order of 200 microseconds on a fast machine.
3930 // Note that on the Windows the CPU usage value is the % usage
3931 // since the last time the API was called (and the first call
3932 // returns 100%), so we'd have to deal with that as well.
3933 //
3934 // b) Sample the "fake" answer using a sampling thread and store
3935 // the answer in a global variable. The call to loadavg would
3936 // just return the value of the global, avoiding the slow query.
3937 //
3938 // c) Sample a better answer using exponential decay to smooth the
3939 // value. This is basically the algorithm used by UNIX kernels.
3940 //
3941 // Note that sampling thread starvation could affect both (b) and (c).
3942 int os::loadavg(double loadavg[], int nelem) {
3943 return -1;
3944 }
3945
3946
3947 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3948 bool os::dont_yield() {
3949 return DontYieldALot;
3950 }
3951
3952 // This method is a slightly reworked copy of JDK's sysOpen
3953 // from src/windows/hpi/src/sys_api_md.c
3954
3955 int os::open(const char *path, int oflag, int mode) {
3956 char pathbuf[MAX_PATH];
3957
3958 if (strlen(path) > MAX_PATH - 1) {
3959 errno = ENAMETOOLONG;
3960 return -1;
3961 }
3962 os::native_path(strcpy(pathbuf, path));
3963 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
3964 }
3965
3966 // Is a (classpath) directory empty?
3967 bool os::dir_is_empty(const char* path) {
3968 WIN32_FIND_DATA fd;
3969 HANDLE f = FindFirstFile(path, &fd);
3970 if (f == INVALID_HANDLE_VALUE) {
3971 return true;
3972 }
3973 FindClose(f);
3974 return false;
3975 }
3976
3977 // create binary file, rewriting existing file if required
3978 int os::create_binary_file(const char* path, bool rewrite_existing) {
3979 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3980 if (!rewrite_existing) {
3981 oflags |= _O_EXCL;
3982 }
3983 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3984 }
3985
3986 // return current position of file pointer
3987 jlong os::current_file_offset(int fd) {
3988 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3989 }
3990
3991 // move file pointer to the specified offset
3992 jlong os::seek_to_file_offset(int fd, jlong offset) {
3993 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3994 }
3995
3996
3997 jlong os::lseek(int fd, jlong offset, int whence) {
3998 return (jlong) ::_lseeki64(fd, offset, whence);
3999 }
4000
4001 // This method is a slightly reworked copy of JDK's sysNativePath
4002 // from src/windows/hpi/src/path_md.c
4003
4004 /* Convert a pathname to native format. On win32, this involves forcing all
4005 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4006 sometimes rejects '/') and removing redundant separators. The input path is
4007 assumed to have been converted into the character encoding used by the local
4008 system. Because this might be a double-byte encoding, care is taken to
4009 treat double-byte lead characters correctly.
4010
4011 This procedure modifies the given path in place, as the result is never
4012 longer than the original. There is no error return; this operation always
4013 succeeds. */
4014 char * os::native_path(char *path) {
4015 char *src = path, *dst = path, *end = path;
4016 char *colon = NULL; /* If a drive specifier is found, this will
4017 point to the colon following the drive
4018 letter */
4019
4020 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4021 assert(((!::IsDBCSLeadByte('/'))
4022 && (!::IsDBCSLeadByte('\\'))
4023 && (!::IsDBCSLeadByte(':'))),
4024 "Illegal lead byte");
4025
4026 /* Check for leading separators */
4027 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4028 while (isfilesep(*src)) {
4029 src++;
4030 }
4031
4032 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4033 /* Remove leading separators if followed by drive specifier. This
4034 hack is necessary to support file URLs containing drive
4035 specifiers (e.g., "file://c:/path"). As a side effect,
4036 "/c:/path" can be used as an alternative to "c:/path". */
4037 *dst++ = *src++;
4038 colon = dst;
4039 *dst++ = ':';
4040 src++;
4041 } else {
4042 src = path;
4043 if (isfilesep(src[0]) && isfilesep(src[1])) {
4044 /* UNC pathname: Retain first separator; leave src pointed at
4045 second separator so that further separators will be collapsed
4046 into the second separator. The result will be a pathname
4047 beginning with "\\\\" followed (most likely) by a host name. */
4048 src = dst = path + 1;
4049 path[0] = '\\'; /* Force first separator to '\\' */
4050 }
4051 }
4052
4053 end = dst;
4054
4055 /* Remove redundant separators from remainder of path, forcing all
4056 separators to be '\\' rather than '/'. Also, single byte space
4057 characters are removed from the end of the path because those
4058 are not legal ending characters on this operating system.
4059 */
4060 while (*src != '\0') {
4061 if (isfilesep(*src)) {
4062 *dst++ = '\\'; src++;
4063 while (isfilesep(*src)) src++;
4064 if (*src == '\0') {
4065 /* Check for trailing separator */
4066 end = dst;
4067 if (colon == dst - 2) break; /* "z:\\" */
4068 if (dst == path + 1) break; /* "\\" */
4069 if (dst == path + 2 && isfilesep(path[0])) {
4070 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4071 beginning of a UNC pathname. Even though it is not, by
4072 itself, a valid UNC pathname, we leave it as is in order
4073 to be consistent with the path canonicalizer as well
4074 as the win32 APIs, which treat this case as an invalid
4075 UNC pathname rather than as an alias for the root
4076 directory of the current drive. */
4077 break;
4078 }
4079 end = --dst; /* Path does not denote a root directory, so
4080 remove trailing separator */
4081 break;
4082 }
4083 end = dst;
4084 } else {
4085 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4086 *dst++ = *src++;
4087 if (*src) *dst++ = *src++;
4088 end = dst;
4089 } else { /* Copy a single-byte character */
4090 char c = *src++;
4091 *dst++ = c;
4092 /* Space is not a legal ending character */
4093 if (c != ' ') end = dst;
4094 }
4095 }
4096 }
4097
4098 *end = '\0';
4099
4100 /* For "z:", add "." to work around a bug in the C runtime library */
4101 if (colon == dst - 1) {
4102 path[2] = '.';
4103 path[3] = '\0';
4104 }
4105
4106 #ifdef DEBUG
4107 jio_fprintf(stderr, "sysNativePath: %s\n", path);
4108 #endif DEBUG
4109 return path;
4110 }
4111
4112 // This code is a copy of JDK's sysSetLength
4113 // from src/windows/hpi/src/sys_api_md.c
4114
4115 int os::ftruncate(int fd, jlong length) {
4116 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4117 long high = (long)(length >> 32);
4118 DWORD ret;
4119
4120 if (h == (HANDLE)(-1)) {
4121 return -1;
4122 }
4123
4124 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4125 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4126 return -1;
4127 }
4128
4129 if (::SetEndOfFile(h) == FALSE) {
4130 return -1;
4131 }
4132
4133 return 0;
4134 }
4135
4136
4137 // This code is a copy of JDK's sysSync
4138 // from src/windows/hpi/src/sys_api_md.c
4139 // except for the legacy workaround for a bug in Win 98
4140
4141 int os::fsync(int fd) {
4142 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4143
4144 if ( (!::FlushFileBuffers(handle)) &&
4145 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4146 /* from winerror.h */
4147 return -1;
4148 }
4149 return 0;
4150 }
4151
4152 static int nonSeekAvailable(int, long *);
4153 static int stdinAvailable(int, long *);
4154
4155 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4156 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4157
4158 // This code is a copy of JDK's sysAvailable
4159 // from src/windows/hpi/src/sys_api_md.c
4160
4161 int os::available(int fd, jlong *bytes) {
4162 jlong cur, end;
4163 struct _stati64 stbuf64;
4164
4165 if (::_fstati64(fd, &stbuf64) >= 0) {
4166 int mode = stbuf64.st_mode;
4167 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4168 int ret;
4169 long lpbytes;
4170 if (fd == 0) {
4171 ret = stdinAvailable(fd, &lpbytes);
4172 } else {
4173 ret = nonSeekAvailable(fd, &lpbytes);
4174 }
4175 (*bytes) = (jlong)(lpbytes);
4176 return ret;
4177 }
4178 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4179 return FALSE;
4180 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4181 return FALSE;
4182 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4183 return FALSE;
4184 }
4185 *bytes = end - cur;
4186 return TRUE;
4187 } else {
4188 return FALSE;
4189 }
4190 }
4191
4192 // This code is a copy of JDK's nonSeekAvailable
4193 // from src/windows/hpi/src/sys_api_md.c
4194
4195 static int nonSeekAvailable(int fd, long *pbytes) {
4196 /* This is used for available on non-seekable devices
4197 * (like both named and anonymous pipes, such as pipes
4198 * connected to an exec'd process).
4199 * Standard Input is a special case.
4200 *
4201 */
4202 HANDLE han;
4203
4204 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4205 return FALSE;
4206 }
4207
4208 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4209 /* PeekNamedPipe fails when at EOF. In that case we
4210 * simply make *pbytes = 0 which is consistent with the
4211 * behavior we get on Solaris when an fd is at EOF.
4212 * The only alternative is to raise an Exception,
4213 * which isn't really warranted.
4214 */
4215 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4216 return FALSE;
4217 }
4218 *pbytes = 0;
4219 }
4220 return TRUE;
4221 }
4222
4223 #define MAX_INPUT_EVENTS 2000
4224
4225 // This code is a copy of JDK's stdinAvailable
4226 // from src/windows/hpi/src/sys_api_md.c
4227
4228 static int stdinAvailable(int fd, long *pbytes) {
4229 HANDLE han;
4230 DWORD numEventsRead = 0; /* Number of events read from buffer */
4231 DWORD numEvents = 0; /* Number of events in buffer */
4232 DWORD i = 0; /* Loop index */
4233 DWORD curLength = 0; /* Position marker */
4234 DWORD actualLength = 0; /* Number of bytes readable */
4235 BOOL error = FALSE; /* Error holder */
4236 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4237
4238 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4239 return FALSE;
4240 }
4241
4242 /* Construct an array of input records in the console buffer */
4243 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4244 if (error == 0) {
4245 return nonSeekAvailable(fd, pbytes);
4246 }
4247
4248 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4249 if (numEvents > MAX_INPUT_EVENTS) {
4250 numEvents = MAX_INPUT_EVENTS;
4251 }
4252
4253 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4254 if (lpBuffer == NULL) {
4255 return FALSE;
4256 }
4257
4258 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4259 if (error == 0) {
4260 os::free(lpBuffer, mtInternal);
4261 return FALSE;
4262 }
4263
4264 /* Examine input records for the number of bytes available */
4265 for(i=0; i<numEvents; i++) {
4266 if (lpBuffer[i].EventType == KEY_EVENT) {
4267
4268 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4269 &(lpBuffer[i].Event);
4270 if (keyRecord->bKeyDown == TRUE) {
4271 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4272 curLength++;
4273 if (*keyPressed == '\r') {
4274 actualLength = curLength;
4275 }
4276 }
4277 }
4278 }
4279
4280 if(lpBuffer != NULL) {
4281 os::free(lpBuffer, mtInternal);
4282 }
4283
4284 *pbytes = (long) actualLength;
4285 return TRUE;
4286 }
4287
4288 // Map a block of memory.
4289 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4290 char *addr, size_t bytes, bool read_only,
4291 bool allow_exec) {
4292 HANDLE hFile;
4293 char* base;
4294
4295 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4296 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4297 if (hFile == NULL) {
4298 if (PrintMiscellaneous && Verbose) {
4299 DWORD err = GetLastError();
4300 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4301 }
4302 return NULL;
4303 }
4304
4305 if (allow_exec) {
4306 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4307 // unless it comes from a PE image (which the shared archive is not.)
4308 // Even VirtualProtect refuses to give execute access to mapped memory
4309 // that was not previously executable.
4310 //
4311 // Instead, stick the executable region in anonymous memory. Yuck.
4312 // Penalty is that ~4 pages will not be shareable - in the future
4313 // we might consider DLLizing the shared archive with a proper PE
4314 // header so that mapping executable + sharing is possible.
4315
4316 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4317 PAGE_READWRITE);
4318 if (base == NULL) {
4319 if (PrintMiscellaneous && Verbose) {
4320 DWORD err = GetLastError();
4321 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4322 }
4323 CloseHandle(hFile);
4324 return NULL;
4325 }
4326
4327 DWORD bytes_read;
4328 OVERLAPPED overlapped;
4329 overlapped.Offset = (DWORD)file_offset;
4330 overlapped.OffsetHigh = 0;
4331 overlapped.hEvent = NULL;
4332 // ReadFile guarantees that if the return value is true, the requested
4333 // number of bytes were read before returning.
4334 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4335 if (!res) {
4336 if (PrintMiscellaneous && Verbose) {
4337 DWORD err = GetLastError();
4338 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4339 }
4340 release_memory(base, bytes);
4341 CloseHandle(hFile);
4342 return NULL;
4343 }
4344 } else {
4345 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4346 NULL /*file_name*/);
4347 if (hMap == NULL) {
4348 if (PrintMiscellaneous && Verbose) {
4349 DWORD err = GetLastError();
4350 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4351 }
4352 CloseHandle(hFile);
4353 return NULL;
4354 }
4355
4356 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4357 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4358 (DWORD)bytes, addr);
4359 if (base == NULL) {
4360 if (PrintMiscellaneous && Verbose) {
4361 DWORD err = GetLastError();
4362 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4363 }
4364 CloseHandle(hMap);
4365 CloseHandle(hFile);
4366 return NULL;
4367 }
4368
4369 if (CloseHandle(hMap) == 0) {
4370 if (PrintMiscellaneous && Verbose) {
4371 DWORD err = GetLastError();
4372 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4373 }
4374 CloseHandle(hFile);
4375 return base;
4376 }
4377 }
4378
4379 if (allow_exec) {
4380 DWORD old_protect;
4381 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4382 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4383
4384 if (!res) {
4385 if (PrintMiscellaneous && Verbose) {
4386 DWORD err = GetLastError();
4387 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4388 }
4389 // Don't consider this a hard error, on IA32 even if the
4390 // VirtualProtect fails, we should still be able to execute
4391 CloseHandle(hFile);
4392 return base;
4393 }
4394 }
4395
4396 if (CloseHandle(hFile) == 0) {
4397 if (PrintMiscellaneous && Verbose) {
4398 DWORD err = GetLastError();
4399 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4400 }
4401 return base;
4402 }
4403
4404 return base;
4405 }
4406
4407
4408 // Remap a block of memory.
4409 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4410 char *addr, size_t bytes, bool read_only,
4411 bool allow_exec) {
4412 // This OS does not allow existing memory maps to be remapped so we
4413 // have to unmap the memory before we remap it.
4414 if (!os::unmap_memory(addr, bytes)) {
4415 return NULL;
4416 }
4417
4418 // There is a very small theoretical window between the unmap_memory()
4419 // call above and the map_memory() call below where a thread in native
4420 // code may be able to access an address that is no longer mapped.
4421
4422 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4423 read_only, allow_exec);
4424 }
4425
4426
4427 // Unmap a block of memory.
4428 // Returns true=success, otherwise false.
4429
4430 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4431 BOOL result = UnmapViewOfFile(addr);
4432 if (result == 0) {
4433 if (PrintMiscellaneous && Verbose) {
4434 DWORD err = GetLastError();
4435 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4436 }
4437 return false;
4438 }
4439 return true;
4440 }
4441
4442 void os::pause() {
4443 char filename[MAX_PATH];
4444 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4445 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4446 } else {
4447 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4448 }
4449
4450 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4451 if (fd != -1) {
4452 struct stat buf;
4453 ::close(fd);
4454 while (::stat(filename, &buf) == 0) {
4455 Sleep(100);
4456 }
4457 } else {
4458 jio_fprintf(stderr,
4459 "Could not open pause file '%s', continuing immediately.\n", filename);
4460 }
4461 }
4462
4463 // An Event wraps a win32 "CreateEvent" kernel handle.
4464 //
4465 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4466 //
4467 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4468 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4469 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4470 // In addition, an unpark() operation might fetch the handle field, but the
4471 // event could recycle between the fetch and the SetEvent() operation.
4472 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4473 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4474 // on an stale but recycled handle would be harmless, but in practice this might
4475 // confuse other non-Sun code, so it's not a viable approach.
4476 //
4477 // 2: Once a win32 event handle is associated with an Event, it remains associated
4478 // with the Event. The event handle is never closed. This could be construed
4479 // as handle leakage, but only up to the maximum # of threads that have been extant
4480 // at any one time. This shouldn't be an issue, as windows platforms typically
4481 // permit a process to have hundreds of thousands of open handles.
4482 //
4483 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4484 // and release unused handles.
4485 //
4486 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4487 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4488 //
4489 // 5. Use an RCU-like mechanism (Read-Copy Update).
4490 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4491 //
4492 // We use (2).
4493 //
4494 // TODO-FIXME:
4495 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4496 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4497 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4498 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4499 // into a single win32 CreateEvent() handle.
4500 //
4501 // _Event transitions in park()
4502 // -1 => -1 : illegal
4503 // 1 => 0 : pass - return immediately
4504 // 0 => -1 : block
4505 //
4506 // _Event serves as a restricted-range semaphore :
4507 // -1 : thread is blocked
4508 // 0 : neutral - thread is running or ready
4509 // 1 : signaled - thread is running or ready
4510 //
4511 // Another possible encoding of _Event would be
4512 // with explicit "PARKED" and "SIGNALED" bits.
4513
4514 int os::PlatformEvent::park (jlong Millis) {
4515 guarantee (_ParkHandle != NULL , "Invariant") ;
4516 guarantee (Millis > 0 , "Invariant") ;
4517 int v ;
4518
4519 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4520 // the initial park() operation.
4521
4522 for (;;) {
4523 v = _Event ;
4524 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4525 }
4526 guarantee ((v == 0) || (v == 1), "invariant") ;
4527 if (v != 0) return OS_OK ;
4528
4529 // Do this the hard way by blocking ...
4530 // TODO: consider a brief spin here, gated on the success of recent
4531 // spin attempts by this thread.
4532 //
4533 // We decompose long timeouts into series of shorter timed waits.
4534 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4535 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4536 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4537 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4538 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4539 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4540 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4541 // for the already waited time. This policy does not admit any new outcomes.
4542 // In the future, however, we might want to track the accumulated wait time and
4543 // adjust Millis accordingly if we encounter a spurious wakeup.
4544
4545 const int MAXTIMEOUT = 0x10000000 ;
4546 DWORD rv = WAIT_TIMEOUT ;
4547 while (_Event < 0 && Millis > 0) {
4548 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4549 if (Millis > MAXTIMEOUT) {
4550 prd = MAXTIMEOUT ;
4551 }
4552 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4553 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4554 if (rv == WAIT_TIMEOUT) {
4555 Millis -= prd ;
4556 }
4557 }
4558 v = _Event ;
4559 _Event = 0 ;
4560 OrderAccess::fence() ;
4561 // If we encounter a nearly simultanous timeout expiry and unpark()
4562 // we return OS_OK indicating we awoke via unpark().
4563 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4564 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4565 }
4566
4567 void os::PlatformEvent::park () {
4568 guarantee (_ParkHandle != NULL, "Invariant") ;
4569 // Invariant: Only the thread associated with the Event/PlatformEvent
4570 // may call park().
4571 int v ;
4572 for (;;) {
4573 v = _Event ;
4574 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4575 }
4576 guarantee ((v == 0) || (v == 1), "invariant") ;
4577 if (v != 0) return ;
4578
4579 // Do this the hard way by blocking ...
4580 // TODO: consider a brief spin here, gated on the success of recent
4581 // spin attempts by this thread.
4582 while (_Event < 0) {
4583 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4584 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4585 }
4586
4587 // Usually we'll find _Event == 0 at this point, but as
4588 // an optional optimization we clear it, just in case can
4589 // multiple unpark() operations drove _Event up to 1.
4590 _Event = 0 ;
4591 OrderAccess::fence() ;
4592 guarantee (_Event >= 0, "invariant") ;
4593 }
4594
4595 void os::PlatformEvent::unpark() {
4596 guarantee (_ParkHandle != NULL, "Invariant") ;
4597 int v ;
4598 for (;;) {
4599 v = _Event ; // Increment _Event if it's < 1.
4600 if (v > 0) {
4601 // If it's already signaled just return.
4602 // The LD of _Event could have reordered or be satisfied
4603 // by a read-aside from this processor's write buffer.
4604 // To avoid problems execute a barrier and then
4605 // ratify the value. A degenerate CAS() would also work.
4606 // Viz., CAS (v+0, &_Event, v) == v).
4607 OrderAccess::fence() ;
4608 if (_Event == v) return ;
4609 continue ;
4610 }
4611 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4612 }
4613 if (v < 0) {
4614 ::SetEvent (_ParkHandle) ;
4615 }
4616 }
4617
4618
4619 // JSR166
4620 // -------------------------------------------------------
4621
4622 /*
4623 * The Windows implementation of Park is very straightforward: Basic
4624 * operations on Win32 Events turn out to have the right semantics to
4625 * use them directly. We opportunistically resuse the event inherited
4626 * from Monitor.
4627 */
4628
4629
4630 void Parker::park(bool isAbsolute, jlong time) {
4631 guarantee (_ParkEvent != NULL, "invariant") ;
4632 // First, demultiplex/decode time arguments
4633 if (time < 0) { // don't wait
4634 return;
4635 }
4636 else if (time == 0 && !isAbsolute) {
4637 time = INFINITE;
4638 }
4639 else if (isAbsolute) {
4640 time -= os::javaTimeMillis(); // convert to relative time
4641 if (time <= 0) // already elapsed
4642 return;
4643 }
4644 else { // relative
4645 time /= 1000000; // Must coarsen from nanos to millis
4646 if (time == 0) // Wait for the minimal time unit if zero
4647 time = 1;
4648 }
4649
4650 JavaThread* thread = (JavaThread*)(Thread::current());
4651 assert(thread->is_Java_thread(), "Must be JavaThread");
4652 JavaThread *jt = (JavaThread *)thread;
4653
4654 // Don't wait if interrupted or already triggered
4655 if (Thread::is_interrupted(thread, false) ||
4656 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4657 ResetEvent(_ParkEvent);
4658 return;
4659 }
4660 else {
4661 ThreadBlockInVM tbivm(jt);
4662 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4663 jt->set_suspend_equivalent();
4664
4665 WaitForSingleObject(_ParkEvent, time);
4666 ResetEvent(_ParkEvent);
4667
4668 // If externally suspended while waiting, re-suspend
4669 if (jt->handle_special_suspend_equivalent_condition()) {
4670 jt->java_suspend_self();
4671 }
4672 }
4673 }
4674
4675 void Parker::unpark() {
4676 guarantee (_ParkEvent != NULL, "invariant") ;
4677 SetEvent(_ParkEvent);
4678 }
4679
4680 // Run the specified command in a separate process. Return its exit value,
4681 // or -1 on failure (e.g. can't create a new process).
4682 int os::fork_and_exec(char* cmd) {
4683 STARTUPINFO si;
4684 PROCESS_INFORMATION pi;
4685
4686 memset(&si, 0, sizeof(si));
4687 si.cb = sizeof(si);
4688 memset(&pi, 0, sizeof(pi));
4689 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4690 cmd, // command line
4691 NULL, // process security attribute
4692 NULL, // thread security attribute
4693 TRUE, // inherits system handles
4694 0, // no creation flags
4695 NULL, // use parent's environment block
4696 NULL, // use parent's starting directory
4697 &si, // (in) startup information
4698 &pi); // (out) process information
4699
4700 if (rslt) {
4701 // Wait until child process exits.
4702 WaitForSingleObject(pi.hProcess, INFINITE);
4703
4704 DWORD exit_code;
4705 GetExitCodeProcess(pi.hProcess, &exit_code);
4706
4707 // Close process and thread handles.
4708 CloseHandle(pi.hProcess);
4709 CloseHandle(pi.hThread);
4710
4711 return (int)exit_code;
4712 } else {
4713 return -1;
4714 }
4715 }
4716
4717 //--------------------------------------------------------------------------------------------------
4718 // Non-product code
4719
4720 static int mallocDebugIntervalCounter = 0;
4721 static int mallocDebugCounter = 0;
4722 bool os::check_heap(bool force) {
4723 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4724 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4725 // Note: HeapValidate executes two hardware breakpoints when it finds something
4726 // wrong; at these points, eax contains the address of the offending block (I think).
4727 // To get to the exlicit error message(s) below, just continue twice.
4728 HANDLE heap = GetProcessHeap();
4729 { HeapLock(heap);
4730 PROCESS_HEAP_ENTRY phe;
4731 phe.lpData = NULL;
4732 while (HeapWalk(heap, &phe) != 0) {
4733 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4734 !HeapValidate(heap, 0, phe.lpData)) {
4735 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4736 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4737 fatal("corrupted C heap");
4738 }
4739 }
4740 DWORD err = GetLastError();
4741 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4742 fatal(err_msg("heap walk aborted with error %d", err));
4743 }
4744 HeapUnlock(heap);
4745 }
4746 mallocDebugIntervalCounter = 0;
4747 }
4748 return true;
4749 }
4750
4751
4752 bool os::find(address addr, outputStream* st) {
4753 // Nothing yet
4754 return false;
4755 }
4756
4757 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4758 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4759
4760 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4761 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4762 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4763 address addr = (address) exceptionRecord->ExceptionInformation[1];
4764
4765 if (os::is_memory_serialize_page(thread, addr))
4766 return EXCEPTION_CONTINUE_EXECUTION;
4767 }
4768
4769 return EXCEPTION_CONTINUE_SEARCH;
4770 }
4771
4772 // We don't build a headless jre for Windows
4773 bool os::is_headless_jre() { return false; }
4774
4775
4776 typedef CRITICAL_SECTION mutex_t;
4777 #define mutexInit(m) InitializeCriticalSection(m)
4778 #define mutexDestroy(m) DeleteCriticalSection(m)
4779 #define mutexLock(m) EnterCriticalSection(m)
4780 #define mutexUnlock(m) LeaveCriticalSection(m)
4781
4782 static bool sock_initialized = FALSE;
4783 static mutex_t sockFnTableMutex;
4784
4785 static void initSock() {
4786 WSADATA wsadata;
4787
4788 if (!os::WinSock2Dll::WinSock2Available()) {
4789 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4790 ::GetLastError());
4791 return;
4792 }
4793 if (sock_initialized == TRUE) return;
4794
4795 ::mutexInit(&sockFnTableMutex);
4796 ::mutexLock(&sockFnTableMutex);
4797 if (os::WinSock2Dll::WSAStartup(MAKEWORD(1,1), &wsadata) != 0) {
4798 jio_fprintf(stderr, "Could not initialize Winsock\n");
4799 }
4800 sock_initialized = TRUE;
4801 ::mutexUnlock(&sockFnTableMutex);
4802 }
4803
4804 struct hostent* os::get_host_by_name(char* name) {
4805 if (!sock_initialized) {
4806 initSock();
4807 }
4808 if (!os::WinSock2Dll::WinSock2Available()) {
4809 return NULL;
4810 }
4811 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4812 }
4813
4814 int os::socket_close(int fd) {
4815 return ::closesocket(fd);
4816 }
4817
4818 int os::socket_available(int fd, jint *pbytes) {
4819 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4820 return (ret < 0) ? 0 : 1;
4821 }
4822
4823 int os::socket(int domain, int type, int protocol) {
4824 return ::socket(domain, type, protocol);
4825 }
4826
4827 int os::listen(int fd, int count) {
4828 return ::listen(fd, count);
4829 }
4830
4831 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4832 return ::connect(fd, him, len);
4833 }
4834
4835 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4836 return ::accept(fd, him, len);
4837 }
4838
4839 int os::sendto(int fd, char* buf, size_t len, uint flags,
4840 struct sockaddr* to, socklen_t tolen) {
4841
4842 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4843 }
4844
4845 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4846 sockaddr* from, socklen_t* fromlen) {
4847
4848 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4849 }
4850
4851 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4852 return ::recv(fd, buf, (int)nBytes, flags);
4853 }
4854
4855 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4856 return ::send(fd, buf, (int)nBytes, flags);
4857 }
4858
4859 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
4860 return ::send(fd, buf, (int)nBytes, flags);
4861 }
4862
4863 int os::timeout(int fd, long timeout) {
4864 fd_set tbl;
4865 struct timeval t;
4866
4867 t.tv_sec = timeout / 1000;
4868 t.tv_usec = (timeout % 1000) * 1000;
4869
4870 tbl.fd_count = 1;
4871 tbl.fd_array[0] = fd;
4872
4873 return ::select(1, &tbl, 0, 0, &t);
4874 }
4875
4876 int os::get_host_name(char* name, int namelen) {
4877 return ::gethostname(name, namelen);
4878 }
4879
4880 int os::socket_shutdown(int fd, int howto) {
4881 return ::shutdown(fd, howto);
4882 }
4883
4884 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
4885 return ::bind(fd, him, len);
4886 }
4887
4888 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
4889 return ::getsockname(fd, him, len);
4890 }
4891
4892 int os::get_sock_opt(int fd, int level, int optname,
4893 char* optval, socklen_t* optlen) {
4894 return ::getsockopt(fd, level, optname, optval, optlen);
4895 }
4896
4897 int os::set_sock_opt(int fd, int level, int optname,
4898 const char* optval, socklen_t optlen) {
4899 return ::setsockopt(fd, level, optname, optval, optlen);
4900 }
4901
4902
4903 // Kernel32 API
4904 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
4905 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
4906 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
4907 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
4908 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
4909
4910 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
4911 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
4912 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
4913 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
4914 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
4915
4916
4917 BOOL os::Kernel32Dll::initialized = FALSE;
4918 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
4919 assert(initialized && _GetLargePageMinimum != NULL,
4920 "GetLargePageMinimumAvailable() not yet called");
4921 return _GetLargePageMinimum();
4922 }
4923
4924 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
4925 if (!initialized) {
4926 initialize();
4927 }
4928 return _GetLargePageMinimum != NULL;
4929 }
4930
4931 BOOL os::Kernel32Dll::NumaCallsAvailable() {
4932 if (!initialized) {
4933 initialize();
4934 }
4935 return _VirtualAllocExNuma != NULL;
4936 }
4937
4938 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
4939 assert(initialized && _VirtualAllocExNuma != NULL,
4940 "NUMACallsAvailable() not yet called");
4941
4942 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
4943 }
4944
4945 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
4946 assert(initialized && _GetNumaHighestNodeNumber != NULL,
4947 "NUMACallsAvailable() not yet called");
4948
4949 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
4950 }
4951
4952 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
4953 assert(initialized && _GetNumaNodeProcessorMask != NULL,
4954 "NUMACallsAvailable() not yet called");
4955
4956 return _GetNumaNodeProcessorMask(node, proc_mask);
4957 }
4958
4959 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
4960 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
4961 if (!initialized) {
4962 initialize();
4963 }
4964
4965 if (_RtlCaptureStackBackTrace != NULL) {
4966 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
4967 BackTrace, BackTraceHash);
4968 } else {
4969 return 0;
4970 }
4971 }
4972
4973 void os::Kernel32Dll::initializeCommon() {
4974 if (!initialized) {
4975 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
4976 assert(handle != NULL, "Just check");
4977 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
4978 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
4979 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
4980 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
4981 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
4982 initialized = TRUE;
4983 }
4984 }
4985
4986
4987
4988 #ifndef JDK6_OR_EARLIER
4989
4990 void os::Kernel32Dll::initialize() {
4991 initializeCommon();
4992 }
4993
4994
4995 // Kernel32 API
4996 inline BOOL os::Kernel32Dll::SwitchToThread() {
4997 return ::SwitchToThread();
4998 }
4999
5000 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5001 return true;
5002 }
5003
5004 // Help tools
5005 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5006 return true;
5007 }
5008
5009 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5010 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5011 }
5012
5013 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5014 return ::Module32First(hSnapshot, lpme);
5015 }
5016
5017 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5018 return ::Module32Next(hSnapshot, lpme);
5019 }
5020
5021
5022 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5023 return true;
5024 }
5025
5026 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5027 ::GetNativeSystemInfo(lpSystemInfo);
5028 }
5029
5030 // PSAPI API
5031 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5032 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5033 }
5034
5035 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5036 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5037 }
5038
5039 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5040 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5041 }
5042
5043 inline BOOL os::PSApiDll::PSApiAvailable() {
5044 return true;
5045 }
5046
5047
5048 // WinSock2 API
5049 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5050 return ::WSAStartup(wVersionRequested, lpWSAData);
5051 }
5052
5053 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5054 return ::gethostbyname(name);
5055 }
5056
5057 inline BOOL os::WinSock2Dll::WinSock2Available() {
5058 return true;
5059 }
5060
5061 // Advapi API
5062 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5063 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5064 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5065 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5066 BufferLength, PreviousState, ReturnLength);
5067 }
5068
5069 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5070 PHANDLE TokenHandle) {
5071 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5072 }
5073
5074 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5075 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5076 }
5077
5078 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5079 return true;
5080 }
5081
5082 #else
5083 // Kernel32 API
5084 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5085 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5086 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5087 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5088 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5089
5090 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5091 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5092 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5093 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5094 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5095
5096 void os::Kernel32Dll::initialize() {
5097 if (!initialized) {
5098 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5099 assert(handle != NULL, "Just check");
5100
5101 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5102 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5103 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5104 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5105 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5106 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5107 initializeCommon(); // resolve the functions that always need resolving
5108
5109 initialized = TRUE;
5110 }
5111 }
5112
5113 BOOL os::Kernel32Dll::SwitchToThread() {
5114 assert(initialized && _SwitchToThread != NULL,
5115 "SwitchToThreadAvailable() not yet called");
5116 return _SwitchToThread();
5117 }
5118
5119
5120 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5121 if (!initialized) {
5122 initialize();
5123 }
5124 return _SwitchToThread != NULL;
5125 }
5126
5127 // Help tools
5128 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5129 if (!initialized) {
5130 initialize();
5131 }
5132 return _CreateToolhelp32Snapshot != NULL &&
5133 _Module32First != NULL &&
5134 _Module32Next != NULL;
5135 }
5136
5137 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5138 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5139 "HelpToolsAvailable() not yet called");
5140
5141 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5142 }
5143
5144 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5145 assert(initialized && _Module32First != NULL,
5146 "HelpToolsAvailable() not yet called");
5147
5148 return _Module32First(hSnapshot, lpme);
5149 }
5150
5151 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5152 assert(initialized && _Module32Next != NULL,
5153 "HelpToolsAvailable() not yet called");
5154
5155 return _Module32Next(hSnapshot, lpme);
5156 }
5157
5158
5159 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5160 if (!initialized) {
5161 initialize();
5162 }
5163 return _GetNativeSystemInfo != NULL;
5164 }
5165
5166 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5167 assert(initialized && _GetNativeSystemInfo != NULL,
5168 "GetNativeSystemInfoAvailable() not yet called");
5169
5170 _GetNativeSystemInfo(lpSystemInfo);
5171 }
5172
5173 // PSAPI API
5174
5175
5176 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5177 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5178 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5179
5180 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5181 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5182 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5183 BOOL os::PSApiDll::initialized = FALSE;
5184
5185 void os::PSApiDll::initialize() {
5186 if (!initialized) {
5187 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5188 if (handle != NULL) {
5189 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5190 "EnumProcessModules");
5191 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5192 "GetModuleFileNameExA");
5193 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5194 "GetModuleInformation");
5195 }
5196 initialized = TRUE;
5197 }
5198 }
5199
5200
5201
5202 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5203 assert(initialized && _EnumProcessModules != NULL,
5204 "PSApiAvailable() not yet called");
5205 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5206 }
5207
5208 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5209 assert(initialized && _GetModuleFileNameEx != NULL,
5210 "PSApiAvailable() not yet called");
5211 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5212 }
5213
5214 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5215 assert(initialized && _GetModuleInformation != NULL,
5216 "PSApiAvailable() not yet called");
5217 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5218 }
5219
5220 BOOL os::PSApiDll::PSApiAvailable() {
5221 if (!initialized) {
5222 initialize();
5223 }
5224 return _EnumProcessModules != NULL &&
5225 _GetModuleFileNameEx != NULL &&
5226 _GetModuleInformation != NULL;
5227 }
5228
5229
5230 // WinSock2 API
5231 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5232 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5233
5234 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5235 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5236 BOOL os::WinSock2Dll::initialized = FALSE;
5237
5238 void os::WinSock2Dll::initialize() {
5239 if (!initialized) {
5240 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5241 if (handle != NULL) {
5242 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5243 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5244 }
5245 initialized = TRUE;
5246 }
5247 }
5248
5249
5250 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5251 assert(initialized && _WSAStartup != NULL,
5252 "WinSock2Available() not yet called");
5253 return _WSAStartup(wVersionRequested, lpWSAData);
5254 }
5255
5256 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5257 assert(initialized && _gethostbyname != NULL,
5258 "WinSock2Available() not yet called");
5259 return _gethostbyname(name);
5260 }
5261
5262 BOOL os::WinSock2Dll::WinSock2Available() {
5263 if (!initialized) {
5264 initialize();
5265 }
5266 return _WSAStartup != NULL &&
5267 _gethostbyname != NULL;
5268 }
5269
5270 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5271 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5272 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5273
5274 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5275 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5276 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5277 BOOL os::Advapi32Dll::initialized = FALSE;
5278
5279 void os::Advapi32Dll::initialize() {
5280 if (!initialized) {
5281 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5282 if (handle != NULL) {
5283 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5284 "AdjustTokenPrivileges");
5285 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5286 "OpenProcessToken");
5287 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5288 "LookupPrivilegeValueA");
5289 }
5290 initialized = TRUE;
5291 }
5292 }
5293
5294 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5295 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5296 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5297 assert(initialized && _AdjustTokenPrivileges != NULL,
5298 "AdvapiAvailable() not yet called");
5299 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5300 BufferLength, PreviousState, ReturnLength);
5301 }
5302
5303 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5304 PHANDLE TokenHandle) {
5305 assert(initialized && _OpenProcessToken != NULL,
5306 "AdvapiAvailable() not yet called");
5307 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5308 }
5309
5310 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5311 assert(initialized && _LookupPrivilegeValue != NULL,
5312 "AdvapiAvailable() not yet called");
5313 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5314 }
5315
5316 BOOL os::Advapi32Dll::AdvapiAvailable() {
5317 if (!initialized) {
5318 initialize();
5319 }
5320 return _AdjustTokenPrivileges != NULL &&
5321 _OpenProcessToken != NULL &&
5322 _LookupPrivilegeValue != NULL;
5323 }
5324
5325 #endif