1 /*
2 * Copyright (c) 1997, 2013, 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/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/decoder.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
70
71 #ifdef _DEBUG
72 #include <crtdbg.h>
73 #endif
74
75
76 #include <windows.h>
77 #include <sys/types.h>
78 #include <sys/stat.h>
79 #include <sys/timeb.h>
80 #include <objidl.h>
81 #include <shlobj.h>
82
83 #include <malloc.h>
84 #include <signal.h>
85 #include <direct.h>
86 #include <errno.h>
87 #include <fcntl.h>
88 #include <io.h>
89 #include <process.h> // For _beginthreadex(), _endthreadex()
90 #include <imagehlp.h> // For os::dll_address_to_function_name
91 /* for enumerating dll libraries */
92 #include <vdmdbg.h>
93
94 // for timer info max values which include all bits
95 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
96
97 // For DLL loading/load error detection
98 // Values of PE COFF
99 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
100 #define IMAGE_FILE_SIGNATURE_LENGTH 4
101
102 static HANDLE main_process;
103 static HANDLE main_thread;
104 static int main_thread_id;
105
106 static FILETIME process_creation_time;
107 static FILETIME process_exit_time;
108 static FILETIME process_user_time;
109 static FILETIME process_kernel_time;
110
111 #ifdef _M_IA64
112 #define __CPU__ ia64
113 #elif _M_AMD64
114 #define __CPU__ amd64
115 #else
116 #define __CPU__ i486
117 #endif
118
119 // save DLL module handle, used by GetModuleFileName
120
121 HINSTANCE vm_lib_handle;
122
123 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
124 switch (reason) {
125 case DLL_PROCESS_ATTACH:
126 vm_lib_handle = hinst;
127 if(ForceTimeHighResolution)
128 timeBeginPeriod(1L);
129 break;
130 case DLL_PROCESS_DETACH:
131 if(ForceTimeHighResolution)
132 timeEndPeriod(1L);
133 break;
134 default:
135 break;
136 }
137 return true;
138 }
139
140 static inline double fileTimeAsDouble(FILETIME* time) {
141 const double high = (double) ((unsigned int) ~0);
142 const double split = 10000000.0;
143 double result = (time->dwLowDateTime / split) +
144 time->dwHighDateTime * (high/split);
145 return result;
146 }
147
148 // Implementation of os
149
150 bool os::getenv(const char* name, char* buffer, int len) {
151 int result = GetEnvironmentVariable(name, buffer, len);
152 return result > 0 && result < len;
153 }
154
155
156 // No setuid programs under Windows.
157 bool os::have_special_privileges() {
158 return false;
159 }
160
161
162 // This method is a periodic task to check for misbehaving JNI applications
163 // under CheckJNI, we can add any periodic checks here.
164 // For Windows at the moment does nothing
165 void os::run_periodic_checks() {
166 return;
167 }
168
169 #ifndef _WIN64
170 // previous UnhandledExceptionFilter, if there is one
171 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
172
173 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
174 #endif
175 void os::init_system_properties_values() {
176 /* sysclasspath, java_home, dll_dir */
177 {
178 char *home_path;
179 char *dll_path;
180 char *pslash;
181 char *bin = "\\bin";
182 char home_dir[MAX_PATH];
183
184 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
185 os::jvm_path(home_dir, sizeof(home_dir));
186 // Found the full path to jvm.dll.
187 // Now cut the path to <java_home>/jre if we can.
188 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
189 pslash = strrchr(home_dir, '\\');
190 if (pslash != NULL) {
191 *pslash = '\0'; /* get rid of \{client|server} */
192 pslash = strrchr(home_dir, '\\');
193 if (pslash != NULL)
194 *pslash = '\0'; /* get rid of \bin */
195 }
196 }
197
198 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
199 if (home_path == NULL)
200 return;
201 strcpy(home_path, home_dir);
202 Arguments::set_java_home(home_path);
203
204 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
205 if (dll_path == NULL)
206 return;
207 strcpy(dll_path, home_dir);
208 strcat(dll_path, bin);
209 Arguments::set_dll_dir(dll_path);
210
211 if (!set_boot_path('\\', ';'))
212 return;
213 }
214
215 /* library_path */
216 #define EXT_DIR "\\lib\\ext"
217 #define BIN_DIR "\\bin"
218 #define PACKAGE_DIR "\\Sun\\Java"
219 {
220 /* Win32 library search order (See the documentation for LoadLibrary):
221 *
222 * 1. The directory from which application is loaded.
223 * 2. The system wide Java Extensions directory (Java only)
224 * 3. System directory (GetSystemDirectory)
225 * 4. Windows directory (GetWindowsDirectory)
226 * 5. The PATH environment variable
227 * 6. The current directory
228 */
229
230 char *library_path;
231 char tmp[MAX_PATH];
232 char *path_str = ::getenv("PATH");
233
234 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
235 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
236
237 library_path[0] = '\0';
238
239 GetModuleFileName(NULL, tmp, sizeof(tmp));
240 *(strrchr(tmp, '\\')) = '\0';
241 strcat(library_path, tmp);
242
243 GetWindowsDirectory(tmp, sizeof(tmp));
244 strcat(library_path, ";");
245 strcat(library_path, tmp);
246 strcat(library_path, PACKAGE_DIR BIN_DIR);
247
248 GetSystemDirectory(tmp, sizeof(tmp));
249 strcat(library_path, ";");
250 strcat(library_path, tmp);
251
252 GetWindowsDirectory(tmp, sizeof(tmp));
253 strcat(library_path, ";");
254 strcat(library_path, tmp);
255
256 if (path_str) {
257 strcat(library_path, ";");
258 strcat(library_path, path_str);
259 }
260
261 strcat(library_path, ";.");
262
263 Arguments::set_library_path(library_path);
264 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
265 }
266
267 /* Default extensions directory */
268 {
269 char path[MAX_PATH];
270 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
271 GetWindowsDirectory(path, MAX_PATH);
272 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
273 path, PACKAGE_DIR, EXT_DIR);
274 Arguments::set_ext_dirs(buf);
275 }
276 #undef EXT_DIR
277 #undef BIN_DIR
278 #undef PACKAGE_DIR
279
280 /* Default endorsed standards directory. */
281 {
282 #define ENDORSED_DIR "\\lib\\endorsed"
283 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
284 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
285 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
286 Arguments::set_endorsed_dirs(buf);
287 #undef ENDORSED_DIR
288 }
289
290 #ifndef _WIN64
291 // set our UnhandledExceptionFilter and save any previous one
292 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
293 #endif
294
295 // Done
296 return;
297 }
298
299 void os::breakpoint() {
300 DebugBreak();
301 }
302
303 // Invoked from the BREAKPOINT Macro
304 extern "C" void breakpoint() {
305 os::breakpoint();
306 }
307
308 /*
309 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
310 * So far, this method is only used by Native Memory Tracking, which is
311 * only supported on Windows XP or later.
312 */
313 address os::get_caller_pc(int n) {
314 #ifdef _NMT_NOINLINE_
315 n ++;
316 #endif
317 address pc;
318 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
319 return pc;
320 }
321 return NULL;
322 }
323
324
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
330
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
335
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
339
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while( 1 )
343 {
344 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
345 if ( stack_bottom == (address)minfo.AllocationBase )
346 stack_size += minfo.RegionSize;
347 else
348 break;
349 }
350
351 #ifdef _M_IA64
352 // IA64 has memory and register stacks
353 //
354 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
355 // at thread creation (1MB backing store growing upwards, 1MB memory stack
356 // growing downwards, 2MB summed up)
357 //
358 // ...
359 // ------- top of stack (high address) -----
360 // |
361 // | 1MB
362 // | Backing Store (Register Stack)
363 // |
364 // | / \
365 // | |
366 // | |
367 // | |
368 // ------------------------ stack base -----
369 // | 1MB
370 // | Memory Stack
371 // |
372 // | |
373 // | |
374 // | |
375 // | \ /
376 // |
377 // ----- bottom of stack (low address) -----
378 // ...
379
380 stack_size = stack_size / 2;
381 #endif
382 return stack_bottom + stack_size;
383 }
384
385 size_t os::current_stack_size() {
386 size_t sz;
387 MEMORY_BASIC_INFORMATION minfo;
388 VirtualQuery(&minfo, &minfo, sizeof(minfo));
389 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
390 return sz;
391 }
392
393 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
394 const struct tm* time_struct_ptr = localtime(clock);
395 if (time_struct_ptr != NULL) {
396 *res = *time_struct_ptr;
397 return res;
398 }
399 return NULL;
400 }
401
402 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
403
404 // Thread start routine for all new Java threads
405 static unsigned __stdcall java_start(Thread* thread) {
406 // Try to randomize the cache line index of hot stack frames.
407 // This helps when threads of the same stack traces evict each other's
408 // cache lines. The threads can be either from the same JVM instance, or
409 // from different JVM instances. The benefit is especially true for
410 // processors with hyperthreading technology.
411 static int counter = 0;
412 int pid = os::current_process_id();
413 _alloca(((pid ^ counter++) & 7) * 128);
414
415 OSThread* osthr = thread->osthread();
416 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
417
418 if (UseNUMA) {
419 int lgrp_id = os::numa_get_group_id();
420 if (lgrp_id != -1) {
421 thread->set_lgrp_id(lgrp_id);
422 }
423 }
424
425
426 // Install a win32 structured exception handler around every thread created
427 // by VM, so VM can genrate error dump when an exception occurred in non-
428 // Java thread (e.g. VM thread).
429 __try {
430 thread->run();
431 } __except(topLevelExceptionFilter(
432 (_EXCEPTION_POINTERS*)_exception_info())) {
433 // Nothing to do.
434 }
435
436 // One less thread is executing
437 // When the VMThread gets here, the main thread may have already exited
438 // which frees the CodeHeap containing the Atomic::add code
439 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
440 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
441 }
442
443 return 0;
444 }
445
446 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
450
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
458
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
462
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
469
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
472
473 return osthread;
474 }
475
476
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
491
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
494
495 thread->set_osthread(osthread);
496 return true;
497 }
498
499 bool os::create_main_thread(JavaThread* thread) {
500 #ifdef ASSERT
501 thread->verify_not_published();
502 #endif
503 if (_starting_thread == NULL) {
504 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
505 if (_starting_thread == NULL) {
506 return false;
507 }
508 }
509
510 // The primordial thread is runnable from the start)
511 _starting_thread->set_state(RUNNABLE);
512
513 thread->set_osthread(_starting_thread);
514 return true;
515 }
516
517 // Allocate and initialize a new OSThread
518 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
519 unsigned thread_id;
520
521 // Allocate the OSThread object
522 OSThread* osthread = new OSThread(NULL, NULL);
523 if (osthread == NULL) {
524 return false;
525 }
526
527 // Initialize support for Java interrupts
528 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
529 if (interrupt_event == NULL) {
530 delete osthread;
531 return NULL;
532 }
533 osthread->set_interrupt_event(interrupt_event);
534 osthread->set_interrupted(false);
535
536 thread->set_osthread(osthread);
537
538 if (stack_size == 0) {
539 switch (thr_type) {
540 case os::java_thread:
541 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
542 if (JavaThread::stack_size_at_create() > 0)
543 stack_size = JavaThread::stack_size_at_create();
544 break;
545 case os::compiler_thread:
546 if (CompilerThreadStackSize > 0) {
547 stack_size = (size_t)(CompilerThreadStackSize * K);
548 break;
549 } // else fall through:
550 // use VMThreadStackSize if CompilerThreadStackSize is not defined
551 case os::vm_thread:
552 case os::pgc_thread:
553 case os::cgc_thread:
554 case os::watcher_thread:
555 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
556 break;
557 }
558 }
559
560 // Create the Win32 thread
561 //
562 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
563 // does not specify stack size. Instead, it specifies the size of
564 // initially committed space. The stack size is determined by
565 // PE header in the executable. If the committed "stack_size" is larger
566 // than default value in the PE header, the stack is rounded up to the
567 // nearest multiple of 1MB. For example if the launcher has default
568 // stack size of 320k, specifying any size less than 320k does not
569 // affect the actual stack size at all, it only affects the initial
570 // commitment. On the other hand, specifying 'stack_size' larger than
571 // default value may cause significant increase in memory usage, because
572 // not only the stack space will be rounded up to MB, but also the
573 // entire space is committed upfront.
574 //
575 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
576 // for CreateThread() that can treat 'stack_size' as stack size. However we
577 // are not supposed to call CreateThread() directly according to MSDN
578 // document because JVM uses C runtime library. The good news is that the
579 // flag appears to work with _beginthredex() as well.
580
581 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
582 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
583 #endif
584
585 HANDLE thread_handle =
586 (HANDLE)_beginthreadex(NULL,
587 (unsigned)stack_size,
588 (unsigned (__stdcall *)(void*)) java_start,
589 thread,
590 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
591 &thread_id);
592 if (thread_handle == NULL) {
593 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
594 // without the flag.
595 thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED,
601 &thread_id);
602 }
603 if (thread_handle == NULL) {
604 // Need to clean up stuff we've allocated so far
605 CloseHandle(osthread->interrupt_event());
606 thread->set_osthread(NULL);
607 delete osthread;
608 return NULL;
609 }
610
611 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
612
613 // Store info on the Win32 thread into the OSThread
614 osthread->set_thread_handle(thread_handle);
615 osthread->set_thread_id(thread_id);
616
617 // Initial thread state is INITIALIZED, not SUSPENDED
618 osthread->set_state(INITIALIZED);
619
620 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
621 return true;
622 }
623
624
625 // Free Win32 resources related to the OSThread
626 void os::free_thread(OSThread* osthread) {
627 assert(osthread != NULL, "osthread not set");
628 CloseHandle(osthread->thread_handle());
629 CloseHandle(osthread->interrupt_event());
630 delete osthread;
631 }
632
633
634 static int has_performance_count = 0;
635 static jlong first_filetime;
636 static jlong initial_performance_count;
637 static jlong performance_frequency;
638
639
640 jlong as_long(LARGE_INTEGER x) {
641 jlong result = 0; // initialization to avoid warning
642 set_high(&result, x.HighPart);
643 set_low(&result, x.LowPart);
644 return result;
645 }
646
647
648 jlong os::elapsed_counter() {
649 LARGE_INTEGER count;
650 if (has_performance_count) {
651 QueryPerformanceCounter(&count);
652 return as_long(count) - initial_performance_count;
653 } else {
654 FILETIME wt;
655 GetSystemTimeAsFileTime(&wt);
656 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
657 }
658 }
659
660
661 jlong os::elapsed_frequency() {
662 if (has_performance_count) {
663 return performance_frequency;
664 } else {
665 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
666 return 10000000;
667 }
668 }
669
670
671 julong os::available_memory() {
672 return win32::available_memory();
673 }
674
675 julong os::win32::available_memory() {
676 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
677 // value if total memory is larger than 4GB
678 MEMORYSTATUSEX ms;
679 ms.dwLength = sizeof(ms);
680 GlobalMemoryStatusEx(&ms);
681
682 return (julong)ms.ullAvailPhys;
683 }
684
685 julong os::physical_memory() {
686 return win32::physical_memory();
687 }
688
689 bool os::has_allocatable_memory_limit(julong* limit) {
690 MEMORYSTATUSEX ms;
691 ms.dwLength = sizeof(ms);
692 GlobalMemoryStatusEx(&ms);
693 #ifdef _LP64
694 *limit = (julong)ms.ullAvailVirtual;
695 return true;
696 #else
697 // Limit to 1400m because of the 2gb address space wall
698 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
699 return true;
700 #endif
701 }
702
703 // VC6 lacks DWORD_PTR
704 #if _MSC_VER < 1300
705 typedef UINT_PTR DWORD_PTR;
706 #endif
707
708 int os::active_processor_count() {
709 DWORD_PTR lpProcessAffinityMask = 0;
710 DWORD_PTR lpSystemAffinityMask = 0;
711 int proc_count = processor_count();
712 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
713 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
714 // Nof active processors is number of bits in process affinity mask
715 int bitcount = 0;
716 while (lpProcessAffinityMask != 0) {
717 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
718 bitcount++;
719 }
720 return bitcount;
721 } else {
722 return proc_count;
723 }
724 }
725
726 void os::set_native_thread_name(const char *name) {
727 // Not yet implemented.
728 return;
729 }
730
731 bool os::distribute_processes(uint length, uint* distribution) {
732 // Not yet implemented.
733 return false;
734 }
735
736 bool os::bind_to_processor(uint processor_id) {
737 // Not yet implemented.
738 return false;
739 }
740
741 static void initialize_performance_counter() {
742 LARGE_INTEGER count;
743 if (QueryPerformanceFrequency(&count)) {
744 has_performance_count = 1;
745 performance_frequency = as_long(count);
746 QueryPerformanceCounter(&count);
747 initial_performance_count = as_long(count);
748 } else {
749 has_performance_count = 0;
750 FILETIME wt;
751 GetSystemTimeAsFileTime(&wt);
752 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
753 }
754 }
755
756
757 double os::elapsedTime() {
758 return (double) elapsed_counter() / (double) elapsed_frequency();
759 }
760
761
762 // Windows format:
763 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
764 // Java format:
765 // Java standards require the number of milliseconds since 1/1/1970
766
767 // Constant offset - calculated using offset()
768 static jlong _offset = 116444736000000000;
769 // Fake time counter for reproducible results when debugging
770 static jlong fake_time = 0;
771
772 #ifdef ASSERT
773 // Just to be safe, recalculate the offset in debug mode
774 static jlong _calculated_offset = 0;
775 static int _has_calculated_offset = 0;
776
777 jlong offset() {
778 if (_has_calculated_offset) return _calculated_offset;
779 SYSTEMTIME java_origin;
780 java_origin.wYear = 1970;
781 java_origin.wMonth = 1;
782 java_origin.wDayOfWeek = 0; // ignored
783 java_origin.wDay = 1;
784 java_origin.wHour = 0;
785 java_origin.wMinute = 0;
786 java_origin.wSecond = 0;
787 java_origin.wMilliseconds = 0;
788 FILETIME jot;
789 if (!SystemTimeToFileTime(&java_origin, &jot)) {
790 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
791 }
792 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
793 _has_calculated_offset = 1;
794 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
795 return _calculated_offset;
796 }
797 #else
798 jlong offset() {
799 return _offset;
800 }
801 #endif
802
803 jlong windows_to_java_time(FILETIME wt) {
804 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
805 return (a - offset()) / 10000;
806 }
807
808 FILETIME java_to_windows_time(jlong l) {
809 jlong a = (l * 10000) + offset();
810 FILETIME result;
811 result.dwHighDateTime = high(a);
812 result.dwLowDateTime = low(a);
813 return result;
814 }
815
816 // For now, we say that Windows does not support vtime. I have no idea
817 // whether it can actually be made to (DLD, 9/13/05).
818
819 bool os::supports_vtime() { return false; }
820 bool os::enable_vtime() { return false; }
821 bool os::vtime_enabled() { return false; }
822 double os::elapsedVTime() {
823 // better than nothing, but not much
824 return elapsedTime();
825 }
826
827 jlong os::javaTimeMillis() {
828 if (UseFakeTimers) {
829 return fake_time++;
830 } else {
831 FILETIME wt;
832 GetSystemTimeAsFileTime(&wt);
833 return windows_to_java_time(wt);
834 }
835 }
836
837 jlong os::javaTimeNanos() {
838 if (!has_performance_count) {
839 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
840 } else {
841 LARGE_INTEGER current_count;
842 QueryPerformanceCounter(¤t_count);
843 double current = as_long(current_count);
844 double freq = performance_frequency;
845 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
846 return time;
847 }
848 }
849
850 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
851 if (!has_performance_count) {
852 // javaTimeMillis() doesn't have much percision,
853 // but it is not going to wrap -- so all 64 bits
854 info_ptr->max_value = ALL_64_BITS;
855
856 // this is a wall clock timer, so may skip
857 info_ptr->may_skip_backward = true;
858 info_ptr->may_skip_forward = true;
859 } else {
860 jlong freq = performance_frequency;
861 if (freq < NANOSECS_PER_SEC) {
862 // the performance counter is 64 bits and we will
863 // be multiplying it -- so no wrap in 64 bits
864 info_ptr->max_value = ALL_64_BITS;
865 } else if (freq > NANOSECS_PER_SEC) {
866 // use the max value the counter can reach to
867 // determine the max value which could be returned
868 julong max_counter = (julong)ALL_64_BITS;
869 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
870 } else {
871 // the performance counter is 64 bits and we will
872 // be using it directly -- so no wrap in 64 bits
873 info_ptr->max_value = ALL_64_BITS;
874 }
875
876 // using a counter, so no skipping
877 info_ptr->may_skip_backward = false;
878 info_ptr->may_skip_forward = false;
879 }
880 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
881 }
882
883 char* os::local_time_string(char *buf, size_t buflen) {
884 SYSTEMTIME st;
885 GetLocalTime(&st);
886 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
887 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
888 return buf;
889 }
890
891 bool os::getTimesSecs(double* process_real_time,
892 double* process_user_time,
893 double* process_system_time) {
894 HANDLE h_process = GetCurrentProcess();
895 FILETIME create_time, exit_time, kernel_time, user_time;
896 BOOL result = GetProcessTimes(h_process,
897 &create_time,
898 &exit_time,
899 &kernel_time,
900 &user_time);
901 if (result != 0) {
902 FILETIME wt;
903 GetSystemTimeAsFileTime(&wt);
904 jlong rtc_millis = windows_to_java_time(wt);
905 jlong user_millis = windows_to_java_time(user_time);
906 jlong system_millis = windows_to_java_time(kernel_time);
907 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
908 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
909 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
910 return true;
911 } else {
912 return false;
913 }
914 }
915
916 void os::shutdown() {
917
918 // allow PerfMemory to attempt cleanup of any persistent resources
919 perfMemory_exit();
920
921 // flush buffered output, finish log files
922 ostream_abort();
923
924 // Check for abort hook
925 abort_hook_t abort_hook = Arguments::abort_hook();
926 if (abort_hook != NULL) {
927 abort_hook();
928 }
929 }
930
931
932 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
933 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
934
935 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
936 HINSTANCE dbghelp;
937 EXCEPTION_POINTERS ep;
938 MINIDUMP_EXCEPTION_INFORMATION mei;
939 MINIDUMP_EXCEPTION_INFORMATION* pmei;
940
941 HANDLE hProcess = GetCurrentProcess();
942 DWORD processId = GetCurrentProcessId();
943 HANDLE dumpFile;
944 MINIDUMP_TYPE dumpType;
945 static const char* cwd;
946
947 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
948 #ifndef ASSERT
949 // If running on a client version of Windows and user has not explicitly enabled dumping
950 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
951 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
952 return;
953 // If running on a server version of Windows and user has explictly disabled dumping
954 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
955 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
956 return;
957 }
958 #else
959 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
960 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
961 return;
962 }
963 #endif
964
965 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
966
967 if (dbghelp == NULL) {
968 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
969 return;
970 }
971
972 _MiniDumpWriteDump = CAST_TO_FN_PTR(
973 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
974 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
975 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
976
977 if (_MiniDumpWriteDump == NULL) {
978 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
979 return;
980 }
981
982 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
983
984 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
985 // API_VERSION_NUMBER 11 or higher contains the ones we want though
986 #if API_VERSION_NUMBER >= 11
987 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
988 MiniDumpWithUnloadedModules);
989 #endif
990
991 cwd = get_current_directory(NULL, 0);
992 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
993 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
994
995 if (dumpFile == INVALID_HANDLE_VALUE) {
996 VMError::report_coredump_status("Failed to create file for dumping", false);
997 return;
998 }
999 if (exceptionRecord != NULL && contextRecord != NULL) {
1000 ep.ContextRecord = (PCONTEXT) contextRecord;
1001 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1002
1003 mei.ThreadId = GetCurrentThreadId();
1004 mei.ExceptionPointers = &ep;
1005 pmei = &mei;
1006 } else {
1007 pmei = NULL;
1008 }
1009
1010
1011 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1012 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1013 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1014 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1015 DWORD error = GetLastError();
1016 LPTSTR msgbuf = NULL;
1017
1018 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1019 FORMAT_MESSAGE_FROM_SYSTEM |
1020 FORMAT_MESSAGE_IGNORE_INSERTS,
1021 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1022
1023 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1024 LocalFree(msgbuf);
1025 } else {
1026 // Call to FormatMessage failed, just include the result from GetLastError
1027 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1028 }
1029 VMError::report_coredump_status(buffer, false);
1030 } else {
1031 VMError::report_coredump_status(buffer, true);
1032 }
1033
1034 CloseHandle(dumpFile);
1035 }
1036
1037
1038
1039 void os::abort(bool dump_core)
1040 {
1041 os::shutdown();
1042 // no core dump on Windows
1043 ::exit(1);
1044 }
1045
1046 // Die immediately, no exit hook, no abort hook, no cleanup.
1047 void os::die() {
1048 _exit(-1);
1049 }
1050
1051 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1052 // * dirent_md.c 1.15 00/02/02
1053 //
1054 // The declarations for DIR and struct dirent are in jvm_win32.h.
1055
1056 /* Caller must have already run dirname through JVM_NativePath, which removes
1057 duplicate slashes and converts all instances of '/' into '\\'. */
1058
1059 DIR *
1060 os::opendir(const char *dirname)
1061 {
1062 assert(dirname != NULL, "just checking"); // hotspot change
1063 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1064 DWORD fattr; // hotspot change
1065 char alt_dirname[4] = { 0, 0, 0, 0 };
1066
1067 if (dirp == 0) {
1068 errno = ENOMEM;
1069 return 0;
1070 }
1071
1072 /*
1073 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1074 * as a directory in FindFirstFile(). We detect this case here and
1075 * prepend the current drive name.
1076 */
1077 if (dirname[1] == '\0' && dirname[0] == '\\') {
1078 alt_dirname[0] = _getdrive() + 'A' - 1;
1079 alt_dirname[1] = ':';
1080 alt_dirname[2] = '\\';
1081 alt_dirname[3] = '\0';
1082 dirname = alt_dirname;
1083 }
1084
1085 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1086 if (dirp->path == 0) {
1087 free(dirp, mtInternal);
1088 errno = ENOMEM;
1089 return 0;
1090 }
1091 strcpy(dirp->path, dirname);
1092
1093 fattr = GetFileAttributes(dirp->path);
1094 if (fattr == 0xffffffff) {
1095 free(dirp->path, mtInternal);
1096 free(dirp, mtInternal);
1097 errno = ENOENT;
1098 return 0;
1099 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1100 free(dirp->path, mtInternal);
1101 free(dirp, mtInternal);
1102 errno = ENOTDIR;
1103 return 0;
1104 }
1105
1106 /* Append "*.*", or possibly "\\*.*", to path */
1107 if (dirp->path[1] == ':'
1108 && (dirp->path[2] == '\0'
1109 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1110 /* No '\\' needed for cases like "Z:" or "Z:\" */
1111 strcat(dirp->path, "*.*");
1112 } else {
1113 strcat(dirp->path, "\\*.*");
1114 }
1115
1116 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1117 if (dirp->handle == INVALID_HANDLE_VALUE) {
1118 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1119 free(dirp->path, mtInternal);
1120 free(dirp, mtInternal);
1121 errno = EACCES;
1122 return 0;
1123 }
1124 }
1125 return dirp;
1126 }
1127
1128 /* parameter dbuf unused on Windows */
1129
1130 struct dirent *
1131 os::readdir(DIR *dirp, dirent *dbuf)
1132 {
1133 assert(dirp != NULL, "just checking"); // hotspot change
1134 if (dirp->handle == INVALID_HANDLE_VALUE) {
1135 return 0;
1136 }
1137
1138 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1139
1140 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1141 if (GetLastError() == ERROR_INVALID_HANDLE) {
1142 errno = EBADF;
1143 return 0;
1144 }
1145 FindClose(dirp->handle);
1146 dirp->handle = INVALID_HANDLE_VALUE;
1147 }
1148
1149 return &dirp->dirent;
1150 }
1151
1152 int
1153 os::closedir(DIR *dirp)
1154 {
1155 assert(dirp != NULL, "just checking"); // hotspot change
1156 if (dirp->handle != INVALID_HANDLE_VALUE) {
1157 if (!FindClose(dirp->handle)) {
1158 errno = EBADF;
1159 return -1;
1160 }
1161 dirp->handle = INVALID_HANDLE_VALUE;
1162 }
1163 free(dirp->path, mtInternal);
1164 free(dirp, mtInternal);
1165 return 0;
1166 }
1167
1168 // This must be hard coded because it's the system's temporary
1169 // directory not the java application's temp directory, ala java.io.tmpdir.
1170 const char* os::get_temp_directory() {
1171 static char path_buf[MAX_PATH];
1172 if (GetTempPath(MAX_PATH, path_buf)>0)
1173 return path_buf;
1174 else{
1175 path_buf[0]='\0';
1176 return path_buf;
1177 }
1178 }
1179
1180 static bool file_exists(const char* filename) {
1181 if (filename == NULL || strlen(filename) == 0) {
1182 return false;
1183 }
1184 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1185 }
1186
1187 bool os::dll_build_name(char *buffer, size_t buflen,
1188 const char* pname, const char* fname) {
1189 bool retval = false;
1190 const size_t pnamelen = pname ? strlen(pname) : 0;
1191 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1192
1193 // Return error on buffer overflow.
1194 if (pnamelen + strlen(fname) + 10 > buflen) {
1195 return retval;
1196 }
1197
1198 if (pnamelen == 0) {
1199 jio_snprintf(buffer, buflen, "%s.dll", fname);
1200 retval = true;
1201 } else if (c == ':' || c == '\\') {
1202 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1203 retval = true;
1204 } else if (strchr(pname, *os::path_separator()) != NULL) {
1205 int n;
1206 char** pelements = split_path(pname, &n);
1207 if (pelements == NULL) {
1208 return false;
1209 }
1210 for (int i = 0 ; i < n ; i++) {
1211 char* path = pelements[i];
1212 // Really shouldn't be NULL, but check can't hurt
1213 size_t plen = (path == NULL) ? 0 : strlen(path);
1214 if (plen == 0) {
1215 continue; // skip the empty path values
1216 }
1217 const char lastchar = path[plen - 1];
1218 if (lastchar == ':' || lastchar == '\\') {
1219 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1220 } else {
1221 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1222 }
1223 if (file_exists(buffer)) {
1224 retval = true;
1225 break;
1226 }
1227 }
1228 // release the storage
1229 for (int i = 0 ; i < n ; i++) {
1230 if (pelements[i] != NULL) {
1231 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1232 }
1233 }
1234 if (pelements != NULL) {
1235 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1236 }
1237 } else {
1238 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1239 retval = true;
1240 }
1241 return retval;
1242 }
1243
1244 // Needs to be in os specific directory because windows requires another
1245 // header file <direct.h>
1246 const char* os::get_current_directory(char *buf, size_t buflen) {
1247 int n = static_cast<int>(buflen);
1248 if (buflen > INT_MAX) n = INT_MAX;
1249 return _getcwd(buf, n);
1250 }
1251
1252 //-----------------------------------------------------------
1253 // Helper functions for fatal error handler
1254 #ifdef _WIN64
1255 // Helper routine which returns true if address in
1256 // within the NTDLL address space.
1257 //
1258 static bool _addr_in_ntdll( address addr )
1259 {
1260 HMODULE hmod;
1261 MODULEINFO minfo;
1262
1263 hmod = GetModuleHandle("NTDLL.DLL");
1264 if ( hmod == NULL ) return false;
1265 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1266 &minfo, sizeof(MODULEINFO)) )
1267 return false;
1268
1269 if ( (addr >= minfo.lpBaseOfDll) &&
1270 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1271 return true;
1272 else
1273 return false;
1274 }
1275 #endif
1276
1277
1278 // Enumerate all modules for a given process ID
1279 //
1280 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1281 // different API for doing this. We use PSAPI.DLL on NT based
1282 // Windows and ToolHelp on 95/98/Me.
1283
1284 // Callback function that is called by enumerate_modules() on
1285 // every DLL module.
1286 // Input parameters:
1287 // int pid,
1288 // char* module_file_name,
1289 // address module_base_addr,
1290 // unsigned module_size,
1291 // void* param
1292 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1293
1294 // enumerate_modules for Windows NT, using PSAPI
1295 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1296 {
1297 HANDLE hProcess ;
1298
1299 # define MAX_NUM_MODULES 128
1300 HMODULE modules[MAX_NUM_MODULES];
1301 static char filename[ MAX_PATH ];
1302 int result = 0;
1303
1304 if (!os::PSApiDll::PSApiAvailable()) {
1305 return 0;
1306 }
1307
1308 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1309 FALSE, pid ) ;
1310 if (hProcess == NULL) return 0;
1311
1312 DWORD size_needed;
1313 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1314 sizeof(modules), &size_needed)) {
1315 CloseHandle( hProcess );
1316 return 0;
1317 }
1318
1319 // number of modules that are currently loaded
1320 int num_modules = size_needed / sizeof(HMODULE);
1321
1322 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1323 // Get Full pathname:
1324 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1325 filename, sizeof(filename))) {
1326 filename[0] = '\0';
1327 }
1328
1329 MODULEINFO modinfo;
1330 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1331 &modinfo, sizeof(modinfo))) {
1332 modinfo.lpBaseOfDll = NULL;
1333 modinfo.SizeOfImage = 0;
1334 }
1335
1336 // Invoke callback function
1337 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1338 modinfo.SizeOfImage, param);
1339 if (result) break;
1340 }
1341
1342 CloseHandle( hProcess ) ;
1343 return result;
1344 }
1345
1346
1347 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1348 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1349 {
1350 HANDLE hSnapShot ;
1351 static MODULEENTRY32 modentry ;
1352 int result = 0;
1353
1354 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1355 return 0;
1356 }
1357
1358 // Get a handle to a Toolhelp snapshot of the system
1359 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1360 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1361 return FALSE ;
1362 }
1363
1364 // iterate through all modules
1365 modentry.dwSize = sizeof(MODULEENTRY32) ;
1366 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1367
1368 while( not_done ) {
1369 // invoke the callback
1370 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1371 modentry.modBaseSize, param);
1372 if (result) break;
1373
1374 modentry.dwSize = sizeof(MODULEENTRY32) ;
1375 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1376 }
1377
1378 CloseHandle(hSnapShot);
1379 return result;
1380 }
1381
1382 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1383 {
1384 // Get current process ID if caller doesn't provide it.
1385 if (!pid) pid = os::current_process_id();
1386
1387 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1388 else return _enumerate_modules_windows(pid, func, param);
1389 }
1390
1391 struct _modinfo {
1392 address addr;
1393 char* full_path; // point to a char buffer
1394 int buflen; // size of the buffer
1395 address base_addr;
1396 };
1397
1398 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1399 unsigned size, void * param) {
1400 struct _modinfo *pmod = (struct _modinfo *)param;
1401 if (!pmod) return -1;
1402
1403 if (base_addr <= pmod->addr &&
1404 base_addr+size > pmod->addr) {
1405 // if a buffer is provided, copy path name to the buffer
1406 if (pmod->full_path) {
1407 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1408 }
1409 pmod->base_addr = base_addr;
1410 return 1;
1411 }
1412 return 0;
1413 }
1414
1415 bool os::dll_address_to_library_name(address addr, char* buf,
1416 int buflen, int* offset) {
1417 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1418 // return the full path to the DLL file, sometimes it returns path
1419 // to the corresponding PDB file (debug info); sometimes it only
1420 // returns partial path, which makes life painful.
1421
1422 struct _modinfo mi;
1423 mi.addr = addr;
1424 mi.full_path = buf;
1425 mi.buflen = buflen;
1426 int pid = os::current_process_id();
1427 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1428 // buf already contains path name
1429 if (offset) *offset = addr - mi.base_addr;
1430 return true;
1431 } else {
1432 if (buf) buf[0] = '\0';
1433 if (offset) *offset = -1;
1434 return false;
1435 }
1436 }
1437
1438 bool os::dll_address_to_function_name(address addr, char *buf,
1439 int buflen, int *offset) {
1440 if (Decoder::decode(addr, buf, buflen, offset)) {
1441 return true;
1442 }
1443 if (offset != NULL) *offset = -1;
1444 if (buf != NULL) buf[0] = '\0';
1445 return false;
1446 }
1447
1448 // save the start and end address of jvm.dll into param[0] and param[1]
1449 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1450 unsigned size, void * param) {
1451 if (!param) return -1;
1452
1453 if (base_addr <= (address)_locate_jvm_dll &&
1454 base_addr+size > (address)_locate_jvm_dll) {
1455 ((address*)param)[0] = base_addr;
1456 ((address*)param)[1] = base_addr + size;
1457 return 1;
1458 }
1459 return 0;
1460 }
1461
1462 address vm_lib_location[2]; // start and end address of jvm.dll
1463
1464 // check if addr is inside jvm.dll
1465 bool os::address_is_in_vm(address addr) {
1466 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1467 int pid = os::current_process_id();
1468 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1469 assert(false, "Can't find jvm module.");
1470 return false;
1471 }
1472 }
1473
1474 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1475 }
1476
1477 // print module info; param is outputStream*
1478 static int _print_module(int pid, char* fname, address base,
1479 unsigned size, void* param) {
1480 if (!param) return -1;
1481
1482 outputStream* st = (outputStream*)param;
1483
1484 address end_addr = base + size;
1485 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1486 return 0;
1487 }
1488
1489 // Loads .dll/.so and
1490 // in case of error it checks if .dll/.so was built for the
1491 // same architecture as Hotspot is running on
1492 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1493 {
1494 void * result = LoadLibrary(name);
1495 if (result != NULL)
1496 {
1497 return result;
1498 }
1499
1500 DWORD errcode = GetLastError();
1501 if (errcode == ERROR_MOD_NOT_FOUND) {
1502 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1503 ebuf[ebuflen-1]='\0';
1504 return NULL;
1505 }
1506
1507 // Parsing dll below
1508 // If we can read dll-info and find that dll was built
1509 // for an architecture other than Hotspot is running in
1510 // - then print to buffer "DLL was built for a different architecture"
1511 // else call os::lasterror to obtain system error message
1512
1513 // Read system error message into ebuf
1514 // It may or may not be overwritten below (in the for loop and just above)
1515 lasterror(ebuf, (size_t) ebuflen);
1516 ebuf[ebuflen-1]='\0';
1517 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1518 if (file_descriptor<0)
1519 {
1520 return NULL;
1521 }
1522
1523 uint32_t signature_offset;
1524 uint16_t lib_arch=0;
1525 bool failed_to_get_lib_arch=
1526 (
1527 //Go to position 3c in the dll
1528 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1529 ||
1530 // Read loacation of signature
1531 (sizeof(signature_offset)!=
1532 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1533 ||
1534 //Go to COFF File Header in dll
1535 //that is located after"signature" (4 bytes long)
1536 (os::seek_to_file_offset(file_descriptor,
1537 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1538 ||
1539 //Read field that contains code of architecture
1540 // that dll was build for
1541 (sizeof(lib_arch)!=
1542 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1543 );
1544
1545 ::close(file_descriptor);
1546 if (failed_to_get_lib_arch)
1547 {
1548 // file i/o error - report os::lasterror(...) msg
1549 return NULL;
1550 }
1551
1552 typedef struct
1553 {
1554 uint16_t arch_code;
1555 char* arch_name;
1556 } arch_t;
1557
1558 static const arch_t arch_array[]={
1559 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1560 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1561 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1562 };
1563 #if (defined _M_IA64)
1564 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1565 #elif (defined _M_AMD64)
1566 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1567 #elif (defined _M_IX86)
1568 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1569 #else
1570 #error Method os::dll_load requires that one of following \
1571 is defined :_M_IA64,_M_AMD64 or _M_IX86
1572 #endif
1573
1574
1575 // Obtain a string for printf operation
1576 // lib_arch_str shall contain string what platform this .dll was built for
1577 // running_arch_str shall string contain what platform Hotspot was built for
1578 char *running_arch_str=NULL,*lib_arch_str=NULL;
1579 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1580 {
1581 if (lib_arch==arch_array[i].arch_code)
1582 lib_arch_str=arch_array[i].arch_name;
1583 if (running_arch==arch_array[i].arch_code)
1584 running_arch_str=arch_array[i].arch_name;
1585 }
1586
1587 assert(running_arch_str,
1588 "Didn't find runing architecture code in arch_array");
1589
1590 // If the architure is right
1591 // but some other error took place - report os::lasterror(...) msg
1592 if (lib_arch == running_arch)
1593 {
1594 return NULL;
1595 }
1596
1597 if (lib_arch_str!=NULL)
1598 {
1599 ::_snprintf(ebuf, ebuflen-1,
1600 "Can't load %s-bit .dll on a %s-bit platform",
1601 lib_arch_str,running_arch_str);
1602 }
1603 else
1604 {
1605 // don't know what architecture this dll was build for
1606 ::_snprintf(ebuf, ebuflen-1,
1607 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1608 lib_arch,running_arch_str);
1609 }
1610
1611 return NULL;
1612 }
1613
1614
1615 void os::print_dll_info(outputStream *st) {
1616 int pid = os::current_process_id();
1617 st->print_cr("Dynamic libraries:");
1618 enumerate_modules(pid, _print_module, (void *)st);
1619 }
1620
1621 void os::print_os_info_brief(outputStream* st) {
1622 os::print_os_info(st);
1623 }
1624
1625 void os::print_os_info(outputStream* st) {
1626 st->print("OS:");
1627
1628 os::win32::print_windows_version(st);
1629 }
1630
1631 void os::win32::print_windows_version(outputStream* st) {
1632 OSVERSIONINFOEX osvi;
1633 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1634 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1635
1636 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1637 st->print_cr("N/A");
1638 return;
1639 }
1640
1641 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1642 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1643 switch (os_vers) {
1644 case 3051: st->print(" Windows NT 3.51"); break;
1645 case 4000: st->print(" Windows NT 4.0"); break;
1646 case 5000: st->print(" Windows 2000"); break;
1647 case 5001: st->print(" Windows XP"); break;
1648 case 5002:
1649 case 6000:
1650 case 6001:
1651 case 6002: {
1652 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1653 // find out whether we are running on 64 bit processor or not.
1654 SYSTEM_INFO si;
1655 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1656 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1657 GetSystemInfo(&si);
1658 } else {
1659 os::Kernel32Dll::GetNativeSystemInfo(&si);
1660 }
1661 if (os_vers == 5002) {
1662 if (osvi.wProductType == VER_NT_WORKSTATION &&
1663 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1664 st->print(" Windows XP x64 Edition");
1665 else
1666 st->print(" Windows Server 2003 family");
1667 } else if (os_vers == 6000) {
1668 if (osvi.wProductType == VER_NT_WORKSTATION)
1669 st->print(" Windows Vista");
1670 else
1671 st->print(" Windows Server 2008");
1672 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1673 st->print(" , 64 bit");
1674 } else if (os_vers == 6001) {
1675 if (osvi.wProductType == VER_NT_WORKSTATION) {
1676 st->print(" Windows 7");
1677 } else {
1678 // Unrecognized windows, print out its major and minor versions
1679 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1680 }
1681 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1682 st->print(" , 64 bit");
1683 } else if (os_vers == 6002) {
1684 if (osvi.wProductType == VER_NT_WORKSTATION) {
1685 st->print(" Windows 8");
1686 } else {
1687 st->print(" Windows Server 2012");
1688 }
1689 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1690 st->print(" , 64 bit");
1691 } else { // future os
1692 // Unrecognized windows, print out its major and minor versions
1693 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1694 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1695 st->print(" , 64 bit");
1696 }
1697 break;
1698 }
1699 default: // future windows, print out its major and minor versions
1700 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1701 }
1702 } else {
1703 switch (os_vers) {
1704 case 4000: st->print(" Windows 95"); break;
1705 case 4010: st->print(" Windows 98"); break;
1706 case 4090: st->print(" Windows Me"); break;
1707 default: // future windows, print out its major and minor versions
1708 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1709 }
1710 }
1711 st->print(" Build %d", osvi.dwBuildNumber);
1712 st->print(" %s", osvi.szCSDVersion); // service pack
1713 st->cr();
1714 }
1715
1716 void os::pd_print_cpu_info(outputStream* st) {
1717 // Nothing to do for now.
1718 }
1719
1720 void os::print_memory_info(outputStream* st) {
1721 st->print("Memory:");
1722 st->print(" %dk page", os::vm_page_size()>>10);
1723
1724 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1725 // value if total memory is larger than 4GB
1726 MEMORYSTATUSEX ms;
1727 ms.dwLength = sizeof(ms);
1728 GlobalMemoryStatusEx(&ms);
1729
1730 st->print(", physical %uk", os::physical_memory() >> 10);
1731 st->print("(%uk free)", os::available_memory() >> 10);
1732
1733 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1734 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1735 st->cr();
1736 }
1737
1738 void os::print_siginfo(outputStream *st, void *siginfo) {
1739 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1740 st->print("siginfo:");
1741 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1742
1743 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1744 er->NumberParameters >= 2) {
1745 switch (er->ExceptionInformation[0]) {
1746 case 0: st->print(", reading address"); break;
1747 case 1: st->print(", writing address"); break;
1748 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1749 er->ExceptionInformation[0]);
1750 }
1751 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1752 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1753 er->NumberParameters >= 2 && UseSharedSpaces) {
1754 FileMapInfo* mapinfo = FileMapInfo::current_info();
1755 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1756 st->print("\n\nError accessing class data sharing archive." \
1757 " Mapped file inaccessible during execution, " \
1758 " possible disk/network problem.");
1759 }
1760 } else {
1761 int num = er->NumberParameters;
1762 if (num > 0) {
1763 st->print(", ExceptionInformation=");
1764 for (int i = 0; i < num; i++) {
1765 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1766 }
1767 }
1768 }
1769 st->cr();
1770 }
1771
1772 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1773 // do nothing
1774 }
1775
1776 static char saved_jvm_path[MAX_PATH] = {0};
1777
1778 // Find the full path to the current module, jvm.dll
1779 void os::jvm_path(char *buf, jint buflen) {
1780 // Error checking.
1781 if (buflen < MAX_PATH) {
1782 assert(false, "must use a large-enough buffer");
1783 buf[0] = '\0';
1784 return;
1785 }
1786 // Lazy resolve the path to current module.
1787 if (saved_jvm_path[0] != 0) {
1788 strcpy(buf, saved_jvm_path);
1789 return;
1790 }
1791
1792 buf[0] = '\0';
1793 if (Arguments::created_by_gamma_launcher()) {
1794 // Support for the gamma launcher. Check for an
1795 // JAVA_HOME environment variable
1796 // and fix up the path so it looks like
1797 // libjvm.so is installed there (append a fake suffix
1798 // hotspot/libjvm.so).
1799 char* java_home_var = ::getenv("JAVA_HOME");
1800 if (java_home_var != NULL && java_home_var[0] != 0) {
1801
1802 strncpy(buf, java_home_var, buflen);
1803
1804 // determine if this is a legacy image or modules image
1805 // modules image doesn't have "jre" subdirectory
1806 size_t len = strlen(buf);
1807 char* jrebin_p = buf + len;
1808 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1809 if (0 != _access(buf, 0)) {
1810 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1811 }
1812 len = strlen(buf);
1813 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1814 }
1815 }
1816
1817 if(buf[0] == '\0') {
1818 GetModuleFileName(vm_lib_handle, buf, buflen);
1819 }
1820 strcpy(saved_jvm_path, buf);
1821 }
1822
1823
1824 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1825 #ifndef _WIN64
1826 st->print("_");
1827 #endif
1828 }
1829
1830
1831 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1832 #ifndef _WIN64
1833 st->print("@%d", args_size * sizeof(int));
1834 #endif
1835 }
1836
1837 // This method is a copy of JDK's sysGetLastErrorString
1838 // from src/windows/hpi/src/system_md.c
1839
1840 size_t os::lasterror(char* buf, size_t len) {
1841 DWORD errval;
1842
1843 if ((errval = GetLastError()) != 0) {
1844 // DOS error
1845 size_t n = (size_t)FormatMessage(
1846 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1847 NULL,
1848 errval,
1849 0,
1850 buf,
1851 (DWORD)len,
1852 NULL);
1853 if (n > 3) {
1854 // Drop final '.', CR, LF
1855 if (buf[n - 1] == '\n') n--;
1856 if (buf[n - 1] == '\r') n--;
1857 if (buf[n - 1] == '.') n--;
1858 buf[n] = '\0';
1859 }
1860 return n;
1861 }
1862
1863 if (errno != 0) {
1864 // C runtime error that has no corresponding DOS error code
1865 const char* s = strerror(errno);
1866 size_t n = strlen(s);
1867 if (n >= len) n = len - 1;
1868 strncpy(buf, s, n);
1869 buf[n] = '\0';
1870 return n;
1871 }
1872
1873 return 0;
1874 }
1875
1876 int os::get_last_error() {
1877 DWORD error = GetLastError();
1878 if (error == 0)
1879 error = errno;
1880 return (int)error;
1881 }
1882
1883 // sun.misc.Signal
1884 // NOTE that this is a workaround for an apparent kernel bug where if
1885 // a signal handler for SIGBREAK is installed then that signal handler
1886 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1887 // See bug 4416763.
1888 static void (*sigbreakHandler)(int) = NULL;
1889
1890 static void UserHandler(int sig, void *siginfo, void *context) {
1891 os::signal_notify(sig);
1892 // We need to reinstate the signal handler each time...
1893 os::signal(sig, (void*)UserHandler);
1894 }
1895
1896 void* os::user_handler() {
1897 return (void*) UserHandler;
1898 }
1899
1900 void* os::signal(int signal_number, void* handler) {
1901 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1902 void (*oldHandler)(int) = sigbreakHandler;
1903 sigbreakHandler = (void (*)(int)) handler;
1904 return (void*) oldHandler;
1905 } else {
1906 return (void*)::signal(signal_number, (void (*)(int))handler);
1907 }
1908 }
1909
1910 void os::signal_raise(int signal_number) {
1911 raise(signal_number);
1912 }
1913
1914 // The Win32 C runtime library maps all console control events other than ^C
1915 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1916 // logoff, and shutdown events. We therefore install our own console handler
1917 // that raises SIGTERM for the latter cases.
1918 //
1919 static BOOL WINAPI consoleHandler(DWORD event) {
1920 switch(event) {
1921 case CTRL_C_EVENT:
1922 if (is_error_reported()) {
1923 // Ctrl-C is pressed during error reporting, likely because the error
1924 // handler fails to abort. Let VM die immediately.
1925 os::die();
1926 }
1927
1928 os::signal_raise(SIGINT);
1929 return TRUE;
1930 break;
1931 case CTRL_BREAK_EVENT:
1932 if (sigbreakHandler != NULL) {
1933 (*sigbreakHandler)(SIGBREAK);
1934 }
1935 return TRUE;
1936 break;
1937 case CTRL_LOGOFF_EVENT: {
1938 // Don't terminate JVM if it is running in a non-interactive session,
1939 // such as a service process.
1940 USEROBJECTFLAGS flags;
1941 HANDLE handle = GetProcessWindowStation();
1942 if (handle != NULL &&
1943 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1944 sizeof( USEROBJECTFLAGS), NULL)) {
1945 // If it is a non-interactive session, let next handler to deal
1946 // with it.
1947 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1948 return FALSE;
1949 }
1950 }
1951 }
1952 case CTRL_CLOSE_EVENT:
1953 case CTRL_SHUTDOWN_EVENT:
1954 os::signal_raise(SIGTERM);
1955 return TRUE;
1956 break;
1957 default:
1958 break;
1959 }
1960 return FALSE;
1961 }
1962
1963 /*
1964 * The following code is moved from os.cpp for making this
1965 * code platform specific, which it is by its very nature.
1966 */
1967
1968 // Return maximum OS signal used + 1 for internal use only
1969 // Used as exit signal for signal_thread
1970 int os::sigexitnum_pd(){
1971 return NSIG;
1972 }
1973
1974 // a counter for each possible signal value, including signal_thread exit signal
1975 static volatile jint pending_signals[NSIG+1] = { 0 };
1976 static HANDLE sig_sem = NULL;
1977
1978 void os::signal_init_pd() {
1979 // Initialize signal structures
1980 memset((void*)pending_signals, 0, sizeof(pending_signals));
1981
1982 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1983
1984 // Programs embedding the VM do not want it to attempt to receive
1985 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1986 // shutdown hooks mechanism introduced in 1.3. For example, when
1987 // the VM is run as part of a Windows NT service (i.e., a servlet
1988 // engine in a web server), the correct behavior is for any console
1989 // control handler to return FALSE, not TRUE, because the OS's
1990 // "final" handler for such events allows the process to continue if
1991 // it is a service (while terminating it if it is not a service).
1992 // To make this behavior uniform and the mechanism simpler, we
1993 // completely disable the VM's usage of these console events if -Xrs
1994 // (=ReduceSignalUsage) is specified. This means, for example, that
1995 // the CTRL-BREAK thread dump mechanism is also disabled in this
1996 // case. See bugs 4323062, 4345157, and related bugs.
1997
1998 if (!ReduceSignalUsage) {
1999 // Add a CTRL-C handler
2000 SetConsoleCtrlHandler(consoleHandler, TRUE);
2001 }
2002 }
2003
2004 void os::signal_notify(int signal_number) {
2005 BOOL ret;
2006 if (sig_sem != NULL) {
2007 Atomic::inc(&pending_signals[signal_number]);
2008 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2009 assert(ret != 0, "ReleaseSemaphore() failed");
2010 }
2011 }
2012
2013 static int check_pending_signals(bool wait_for_signal) {
2014 DWORD ret;
2015 while (true) {
2016 for (int i = 0; i < NSIG + 1; i++) {
2017 jint n = pending_signals[i];
2018 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2019 return i;
2020 }
2021 }
2022 if (!wait_for_signal) {
2023 return -1;
2024 }
2025
2026 JavaThread *thread = JavaThread::current();
2027
2028 ThreadBlockInVM tbivm(thread);
2029
2030 bool threadIsSuspended;
2031 do {
2032 thread->set_suspend_equivalent();
2033 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2034 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2035 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2036
2037 // were we externally suspended while we were waiting?
2038 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2039 if (threadIsSuspended) {
2040 //
2041 // The semaphore has been incremented, but while we were waiting
2042 // another thread suspended us. We don't want to continue running
2043 // while suspended because that would surprise the thread that
2044 // suspended us.
2045 //
2046 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2047 assert(ret != 0, "ReleaseSemaphore() failed");
2048
2049 thread->java_suspend_self();
2050 }
2051 } while (threadIsSuspended);
2052 }
2053 }
2054
2055 int os::signal_lookup() {
2056 return check_pending_signals(false);
2057 }
2058
2059 int os::signal_wait() {
2060 return check_pending_signals(true);
2061 }
2062
2063 // Implicit OS exception handling
2064
2065 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2066 JavaThread* thread = JavaThread::current();
2067 // Save pc in thread
2068 #ifdef _M_IA64
2069 // Do not blow up if no thread info available.
2070 if (thread) {
2071 // Saving PRECISE pc (with slot information) in thread.
2072 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2073 // Convert precise PC into "Unix" format
2074 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2075 thread->set_saved_exception_pc((address)precise_pc);
2076 }
2077 // Set pc to handler
2078 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2079 // Clear out psr.ri (= Restart Instruction) in order to continue
2080 // at the beginning of the target bundle.
2081 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2082 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2083 #elif _M_AMD64
2084 // Do not blow up if no thread info available.
2085 if (thread) {
2086 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2087 }
2088 // Set pc to handler
2089 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2090 #else
2091 // Do not blow up if no thread info available.
2092 if (thread) {
2093 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2094 }
2095 // Set pc to handler
2096 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2097 #endif
2098
2099 // Continue the execution
2100 return EXCEPTION_CONTINUE_EXECUTION;
2101 }
2102
2103
2104 // Used for PostMortemDump
2105 extern "C" void safepoints();
2106 extern "C" void find(int x);
2107 extern "C" void events();
2108
2109 // According to Windows API documentation, an illegal instruction sequence should generate
2110 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2111 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2112 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2113
2114 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2115
2116 // From "Execution Protection in the Windows Operating System" draft 0.35
2117 // Once a system header becomes available, the "real" define should be
2118 // included or copied here.
2119 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2120
2121 // Handle NAT Bit consumption on IA64.
2122 #ifdef _M_IA64
2123 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2124 #endif
2125
2126 // Windows Vista/2008 heap corruption check
2127 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2128
2129 #define def_excpt(val) #val, val
2130
2131 struct siglabel {
2132 char *name;
2133 int number;
2134 };
2135
2136 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2137 // C++ compiler contain this error code. Because this is a compiler-generated
2138 // error, the code is not listed in the Win32 API header files.
2139 // The code is actually a cryptic mnemonic device, with the initial "E"
2140 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2141 // ASCII values of "msc".
2142
2143 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2144
2145
2146 struct siglabel exceptlabels[] = {
2147 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2148 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2149 def_excpt(EXCEPTION_BREAKPOINT),
2150 def_excpt(EXCEPTION_SINGLE_STEP),
2151 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2152 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2153 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2154 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2155 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2156 def_excpt(EXCEPTION_FLT_OVERFLOW),
2157 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2158 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2159 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2160 def_excpt(EXCEPTION_INT_OVERFLOW),
2161 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2162 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2163 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2164 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2165 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2166 def_excpt(EXCEPTION_STACK_OVERFLOW),
2167 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2168 def_excpt(EXCEPTION_GUARD_PAGE),
2169 def_excpt(EXCEPTION_INVALID_HANDLE),
2170 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2171 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2172 #ifdef _M_IA64
2173 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2174 #endif
2175 NULL, 0
2176 };
2177
2178 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2179 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2180 if (exceptlabels[i].number == exception_code) {
2181 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2182 return buf;
2183 }
2184 }
2185
2186 return NULL;
2187 }
2188
2189 //-----------------------------------------------------------------------------
2190 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2191 // handle exception caused by idiv; should only happen for -MinInt/-1
2192 // (division by zero is handled explicitly)
2193 #ifdef _M_IA64
2194 assert(0, "Fix Handle_IDiv_Exception");
2195 #elif _M_AMD64
2196 PCONTEXT ctx = exceptionInfo->ContextRecord;
2197 address pc = (address)ctx->Rip;
2198 assert(pc[0] == 0xF7, "not an idiv opcode");
2199 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2200 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2201 // set correct result values and continue after idiv instruction
2202 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2203 ctx->Rax = (DWORD)min_jint; // result
2204 ctx->Rdx = (DWORD)0; // remainder
2205 // Continue the execution
2206 #else
2207 PCONTEXT ctx = exceptionInfo->ContextRecord;
2208 address pc = (address)ctx->Eip;
2209 assert(pc[0] == 0xF7, "not an idiv opcode");
2210 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2211 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2212 // set correct result values and continue after idiv instruction
2213 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2214 ctx->Eax = (DWORD)min_jint; // result
2215 ctx->Edx = (DWORD)0; // remainder
2216 // Continue the execution
2217 #endif
2218 return EXCEPTION_CONTINUE_EXECUTION;
2219 }
2220
2221 #ifndef _WIN64
2222 //-----------------------------------------------------------------------------
2223 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2224 // handle exception caused by native method modifying control word
2225 PCONTEXT ctx = exceptionInfo->ContextRecord;
2226 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2227
2228 switch (exception_code) {
2229 case EXCEPTION_FLT_DENORMAL_OPERAND:
2230 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2231 case EXCEPTION_FLT_INEXACT_RESULT:
2232 case EXCEPTION_FLT_INVALID_OPERATION:
2233 case EXCEPTION_FLT_OVERFLOW:
2234 case EXCEPTION_FLT_STACK_CHECK:
2235 case EXCEPTION_FLT_UNDERFLOW:
2236 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2237 if (fp_control_word != ctx->FloatSave.ControlWord) {
2238 // Restore FPCW and mask out FLT exceptions
2239 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2240 // Mask out pending FLT exceptions
2241 ctx->FloatSave.StatusWord &= 0xffffff00;
2242 return EXCEPTION_CONTINUE_EXECUTION;
2243 }
2244 }
2245
2246 if (prev_uef_handler != NULL) {
2247 // We didn't handle this exception so pass it to the previous
2248 // UnhandledExceptionFilter.
2249 return (prev_uef_handler)(exceptionInfo);
2250 }
2251
2252 return EXCEPTION_CONTINUE_SEARCH;
2253 }
2254 #else //_WIN64
2255 /*
2256 On Windows, the mxcsr control bits are non-volatile across calls
2257 See also CR 6192333
2258 If EXCEPTION_FLT_* happened after some native method modified
2259 mxcsr - it is not a jvm fault.
2260 However should we decide to restore of mxcsr after a faulty
2261 native method we can uncomment following code
2262 jint MxCsr = INITIAL_MXCSR;
2263 // we can't use StubRoutines::addr_mxcsr_std()
2264 // because in Win64 mxcsr is not saved there
2265 if (MxCsr != ctx->MxCsr) {
2266 ctx->MxCsr = MxCsr;
2267 return EXCEPTION_CONTINUE_EXECUTION;
2268 }
2269
2270 */
2271 #endif //_WIN64
2272
2273
2274 // Fatal error reporting is single threaded so we can make this a
2275 // static and preallocated. If it's more than MAX_PATH silently ignore
2276 // it.
2277 static char saved_error_file[MAX_PATH] = {0};
2278
2279 void os::set_error_file(const char *logfile) {
2280 if (strlen(logfile) <= MAX_PATH) {
2281 strncpy(saved_error_file, logfile, MAX_PATH);
2282 }
2283 }
2284
2285 static inline void report_error(Thread* t, DWORD exception_code,
2286 address addr, void* siginfo, void* context) {
2287 VMError err(t, exception_code, addr, siginfo, context);
2288 err.report_and_die();
2289
2290 // If UseOsErrorReporting, this will return here and save the error file
2291 // somewhere where we can find it in the minidump.
2292 }
2293
2294 //-----------------------------------------------------------------------------
2295 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2296 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2297 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2298 #ifdef _M_IA64
2299 // On Itanium, we need the "precise pc", which has the slot number coded
2300 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2301 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2302 // Convert the pc to "Unix format", which has the slot number coded
2303 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2304 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2305 // information is saved in the Unix format.
2306 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2307 #elif _M_AMD64
2308 address pc = (address) exceptionInfo->ContextRecord->Rip;
2309 #else
2310 address pc = (address) exceptionInfo->ContextRecord->Eip;
2311 #endif
2312 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2313
2314 #ifndef _WIN64
2315 // Execution protection violation - win32 running on AMD64 only
2316 // Handled first to avoid misdiagnosis as a "normal" access violation;
2317 // This is safe to do because we have a new/unique ExceptionInformation
2318 // code for this condition.
2319 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2320 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2321 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2322 address addr = (address) exceptionRecord->ExceptionInformation[1];
2323
2324 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2325 int page_size = os::vm_page_size();
2326
2327 // Make sure the pc and the faulting address are sane.
2328 //
2329 // If an instruction spans a page boundary, and the page containing
2330 // the beginning of the instruction is executable but the following
2331 // page is not, the pc and the faulting address might be slightly
2332 // different - we still want to unguard the 2nd page in this case.
2333 //
2334 // 15 bytes seems to be a (very) safe value for max instruction size.
2335 bool pc_is_near_addr =
2336 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2337 bool instr_spans_page_boundary =
2338 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2339 (intptr_t) page_size) > 0);
2340
2341 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2342 static volatile address last_addr =
2343 (address) os::non_memory_address_word();
2344
2345 // In conservative mode, don't unguard unless the address is in the VM
2346 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2347 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2348
2349 // Set memory to RWX and retry
2350 address page_start =
2351 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2352 bool res = os::protect_memory((char*) page_start, page_size,
2353 os::MEM_PROT_RWX);
2354
2355 if (PrintMiscellaneous && Verbose) {
2356 char buf[256];
2357 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2358 "at " INTPTR_FORMAT
2359 ", unguarding " INTPTR_FORMAT ": %s", addr,
2360 page_start, (res ? "success" : strerror(errno)));
2361 tty->print_raw_cr(buf);
2362 }
2363
2364 // Set last_addr so if we fault again at the same address, we don't
2365 // end up in an endless loop.
2366 //
2367 // There are two potential complications here. Two threads trapping
2368 // at the same address at the same time could cause one of the
2369 // threads to think it already unguarded, and abort the VM. Likely
2370 // very rare.
2371 //
2372 // The other race involves two threads alternately trapping at
2373 // different addresses and failing to unguard the page, resulting in
2374 // an endless loop. This condition is probably even more unlikely
2375 // than the first.
2376 //
2377 // Although both cases could be avoided by using locks or thread
2378 // local last_addr, these solutions are unnecessary complication:
2379 // this handler is a best-effort safety net, not a complete solution.
2380 // It is disabled by default and should only be used as a workaround
2381 // in case we missed any no-execute-unsafe VM code.
2382
2383 last_addr = addr;
2384
2385 return EXCEPTION_CONTINUE_EXECUTION;
2386 }
2387 }
2388
2389 // Last unguard failed or not unguarding
2390 tty->print_raw_cr("Execution protection violation");
2391 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2392 exceptionInfo->ContextRecord);
2393 return EXCEPTION_CONTINUE_SEARCH;
2394 }
2395 }
2396 #endif // _WIN64
2397
2398 // Check to see if we caught the safepoint code in the
2399 // process of write protecting the memory serialization page.
2400 // It write enables the page immediately after protecting it
2401 // so just return.
2402 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2403 JavaThread* thread = (JavaThread*) t;
2404 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2405 address addr = (address) exceptionRecord->ExceptionInformation[1];
2406 if ( os::is_memory_serialize_page(thread, addr) ) {
2407 // Block current thread until the memory serialize page permission restored.
2408 os::block_on_serialize_page_trap();
2409 return EXCEPTION_CONTINUE_EXECUTION;
2410 }
2411 }
2412
2413 if (t != NULL && t->is_Java_thread()) {
2414 JavaThread* thread = (JavaThread*) t;
2415 bool in_java = thread->thread_state() == _thread_in_Java;
2416
2417 // Handle potential stack overflows up front.
2418 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2419 if (os::uses_stack_guard_pages()) {
2420 #ifdef _M_IA64
2421 // Use guard page for register stack.
2422 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2423 address addr = (address) exceptionRecord->ExceptionInformation[1];
2424 // Check for a register stack overflow on Itanium
2425 if (thread->addr_inside_register_stack_red_zone(addr)) {
2426 // Fatal red zone violation happens if the Java program
2427 // catches a StackOverflow error and does so much processing
2428 // that it runs beyond the unprotected yellow guard zone. As
2429 // a result, we are out of here.
2430 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2431 } else if(thread->addr_inside_register_stack(addr)) {
2432 // Disable the yellow zone which sets the state that
2433 // we've got a stack overflow problem.
2434 if (thread->stack_yellow_zone_enabled()) {
2435 thread->disable_stack_yellow_zone();
2436 }
2437 // Give us some room to process the exception.
2438 thread->disable_register_stack_guard();
2439 // Tracing with +Verbose.
2440 if (Verbose) {
2441 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2442 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2443 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2444 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2445 thread->register_stack_base(),
2446 thread->register_stack_base() + thread->stack_size());
2447 }
2448
2449 // Reguard the permanent register stack red zone just to be sure.
2450 // We saw Windows silently disabling this without telling us.
2451 thread->enable_register_stack_red_zone();
2452
2453 return Handle_Exception(exceptionInfo,
2454 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2455 }
2456 #endif
2457 if (thread->stack_yellow_zone_enabled()) {
2458 // Yellow zone violation. The o/s has unprotected the first yellow
2459 // zone page for us. Note: must call disable_stack_yellow_zone to
2460 // update the enabled status, even if the zone contains only one page.
2461 thread->disable_stack_yellow_zone();
2462 // If not in java code, return and hope for the best.
2463 return in_java ? Handle_Exception(exceptionInfo,
2464 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2465 : EXCEPTION_CONTINUE_EXECUTION;
2466 } else {
2467 // Fatal red zone violation.
2468 thread->disable_stack_red_zone();
2469 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2470 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2471 exceptionInfo->ContextRecord);
2472 return EXCEPTION_CONTINUE_SEARCH;
2473 }
2474 } else if (in_java) {
2475 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2476 // a one-time-only guard page, which it has released to us. The next
2477 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2478 return Handle_Exception(exceptionInfo,
2479 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2480 } else {
2481 // Can only return and hope for the best. Further stack growth will
2482 // result in an ACCESS_VIOLATION.
2483 return EXCEPTION_CONTINUE_EXECUTION;
2484 }
2485 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2486 // Either stack overflow or null pointer exception.
2487 if (in_java) {
2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2489 address addr = (address) exceptionRecord->ExceptionInformation[1];
2490 address stack_end = thread->stack_base() - thread->stack_size();
2491 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2492 // Stack overflow.
2493 assert(!os::uses_stack_guard_pages(),
2494 "should be caught by red zone code above.");
2495 return Handle_Exception(exceptionInfo,
2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2497 }
2498 //
2499 // Check for safepoint polling and implicit null
2500 // We only expect null pointers in the stubs (vtable)
2501 // the rest are checked explicitly now.
2502 //
2503 CodeBlob* cb = CodeCache::find_blob(pc);
2504 if (cb != NULL) {
2505 if (os::is_poll_address(addr)) {
2506 address stub = SharedRuntime::get_poll_stub(pc);
2507 return Handle_Exception(exceptionInfo, stub);
2508 }
2509 }
2510 {
2511 #ifdef _WIN64
2512 //
2513 // If it's a legal stack address map the entire region in
2514 //
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2518 addr = (address)((uintptr_t)addr &
2519 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2520 os::commit_memory((char *)addr, thread->stack_base() - addr,
2521 false );
2522 return EXCEPTION_CONTINUE_EXECUTION;
2523 }
2524 else
2525 #endif
2526 {
2527 // Null pointer exception.
2528 #ifdef _M_IA64
2529 // Process implicit null checks in compiled code. Note: Implicit null checks
2530 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2531 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2532 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2533 // Handle implicit null check in UEP method entry
2534 if (cb && (cb->is_frame_complete_at(pc) ||
2535 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2536 if (Verbose) {
2537 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2538 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2539 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2540 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2541 *(bundle_start + 1), *bundle_start);
2542 }
2543 return Handle_Exception(exceptionInfo,
2544 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2545 }
2546 }
2547
2548 // Implicit null checks were processed above. Hence, we should not reach
2549 // here in the usual case => die!
2550 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2551 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2552 exceptionInfo->ContextRecord);
2553 return EXCEPTION_CONTINUE_SEARCH;
2554
2555 #else // !IA64
2556
2557 // Windows 98 reports faulting addresses incorrectly
2558 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2559 !os::win32::is_nt()) {
2560 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2561 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2562 }
2563 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2564 exceptionInfo->ContextRecord);
2565 return EXCEPTION_CONTINUE_SEARCH;
2566 #endif
2567 }
2568 }
2569 }
2570
2571 #ifdef _WIN64
2572 // Special care for fast JNI field accessors.
2573 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2574 // in and the heap gets shrunk before the field access.
2575 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2576 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2577 if (addr != (address)-1) {
2578 return Handle_Exception(exceptionInfo, addr);
2579 }
2580 }
2581 #endif
2582
2583 // Stack overflow or null pointer exception in native code.
2584 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 return EXCEPTION_CONTINUE_SEARCH;
2587 } // /EXCEPTION_ACCESS_VIOLATION
2588 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2589 #if defined _M_IA64
2590 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2591 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2592 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2593
2594 // Compiled method patched to be non entrant? Following conditions must apply:
2595 // 1. must be first instruction in bundle
2596 // 2. must be a break instruction with appropriate code
2597 if((((uint64_t) pc & 0x0F) == 0) &&
2598 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2599 return Handle_Exception(exceptionInfo,
2600 (address)SharedRuntime::get_handle_wrong_method_stub());
2601 }
2602 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2603 #endif
2604
2605
2606 if (in_java) {
2607 switch (exception_code) {
2608 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2609 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2610
2611 case EXCEPTION_INT_OVERFLOW:
2612 return Handle_IDiv_Exception(exceptionInfo);
2613
2614 } // switch
2615 }
2616 #ifndef _WIN64
2617 if (((thread->thread_state() == _thread_in_Java) ||
2618 (thread->thread_state() == _thread_in_native)) &&
2619 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2620 {
2621 LONG result=Handle_FLT_Exception(exceptionInfo);
2622 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2623 }
2624 #endif //_WIN64
2625 }
2626
2627 if (exception_code != EXCEPTION_BREAKPOINT) {
2628 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2629 exceptionInfo->ContextRecord);
2630 }
2631 return EXCEPTION_CONTINUE_SEARCH;
2632 }
2633
2634 #ifndef _WIN64
2635 // Special care for fast JNI accessors.
2636 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2637 // the heap gets shrunk before the field access.
2638 // Need to install our own structured exception handler since native code may
2639 // install its own.
2640 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2641 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2642 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2643 address pc = (address) exceptionInfo->ContextRecord->Eip;
2644 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2645 if (addr != (address)-1) {
2646 return Handle_Exception(exceptionInfo, addr);
2647 }
2648 }
2649 return EXCEPTION_CONTINUE_SEARCH;
2650 }
2651
2652 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2653 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2654 __try { \
2655 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2656 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2657 } \
2658 return 0; \
2659 }
2660
2661 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2662 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2663 DEFINE_FAST_GETFIELD(jchar, char, Char)
2664 DEFINE_FAST_GETFIELD(jshort, short, Short)
2665 DEFINE_FAST_GETFIELD(jint, int, Int)
2666 DEFINE_FAST_GETFIELD(jlong, long, Long)
2667 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2668 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2669
2670 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2671 switch (type) {
2672 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2673 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2674 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2675 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2676 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2677 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2678 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2679 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2680 default: ShouldNotReachHere();
2681 }
2682 return (address)-1;
2683 }
2684 #endif
2685
2686 // Virtual Memory
2687
2688 int os::vm_page_size() { return os::win32::vm_page_size(); }
2689 int os::vm_allocation_granularity() {
2690 return os::win32::vm_allocation_granularity();
2691 }
2692
2693 // Windows large page support is available on Windows 2003. In order to use
2694 // large page memory, the administrator must first assign additional privilege
2695 // to the user:
2696 // + select Control Panel -> Administrative Tools -> Local Security Policy
2697 // + select Local Policies -> User Rights Assignment
2698 // + double click "Lock pages in memory", add users and/or groups
2699 // + reboot
2700 // Note the above steps are needed for administrator as well, as administrators
2701 // by default do not have the privilege to lock pages in memory.
2702 //
2703 // Note about Windows 2003: although the API supports committing large page
2704 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2705 // scenario, I found through experiment it only uses large page if the entire
2706 // memory region is reserved and committed in a single VirtualAlloc() call.
2707 // This makes Windows large page support more or less like Solaris ISM, in
2708 // that the entire heap must be committed upfront. This probably will change
2709 // in the future, if so the code below needs to be revisited.
2710
2711 #ifndef MEM_LARGE_PAGES
2712 #define MEM_LARGE_PAGES 0x20000000
2713 #endif
2714
2715 static HANDLE _hProcess;
2716 static HANDLE _hToken;
2717
2718 // Container for NUMA node list info
2719 class NUMANodeListHolder {
2720 private:
2721 int *_numa_used_node_list; // allocated below
2722 int _numa_used_node_count;
2723
2724 void free_node_list() {
2725 if (_numa_used_node_list != NULL) {
2726 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2727 }
2728 }
2729
2730 public:
2731 NUMANodeListHolder() {
2732 _numa_used_node_count = 0;
2733 _numa_used_node_list = NULL;
2734 // do rest of initialization in build routine (after function pointers are set up)
2735 }
2736
2737 ~NUMANodeListHolder() {
2738 free_node_list();
2739 }
2740
2741 bool build() {
2742 DWORD_PTR proc_aff_mask;
2743 DWORD_PTR sys_aff_mask;
2744 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2745 ULONG highest_node_number;
2746 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2747 free_node_list();
2748 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2749 for (unsigned int i = 0; i <= highest_node_number; i++) {
2750 ULONGLONG proc_mask_numa_node;
2751 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2752 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2753 _numa_used_node_list[_numa_used_node_count++] = i;
2754 }
2755 }
2756 return (_numa_used_node_count > 1);
2757 }
2758
2759 int get_count() {return _numa_used_node_count;}
2760 int get_node_list_entry(int n) {
2761 // for indexes out of range, returns -1
2762 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2763 }
2764
2765 } numa_node_list_holder;
2766
2767
2768
2769 static size_t _large_page_size = 0;
2770
2771 static bool resolve_functions_for_large_page_init() {
2772 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2773 os::Advapi32Dll::AdvapiAvailable();
2774 }
2775
2776 static bool request_lock_memory_privilege() {
2777 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2778 os::current_process_id());
2779
2780 LUID luid;
2781 if (_hProcess != NULL &&
2782 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2783 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2784
2785 TOKEN_PRIVILEGES tp;
2786 tp.PrivilegeCount = 1;
2787 tp.Privileges[0].Luid = luid;
2788 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2789
2790 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2791 // privilege. Check GetLastError() too. See MSDN document.
2792 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2793 (GetLastError() == ERROR_SUCCESS)) {
2794 return true;
2795 }
2796 }
2797
2798 return false;
2799 }
2800
2801 static void cleanup_after_large_page_init() {
2802 if (_hProcess) CloseHandle(_hProcess);
2803 _hProcess = NULL;
2804 if (_hToken) CloseHandle(_hToken);
2805 _hToken = NULL;
2806 }
2807
2808 static bool numa_interleaving_init() {
2809 bool success = false;
2810 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2811
2812 // print a warning if UseNUMAInterleaving flag is specified on command line
2813 bool warn_on_failure = use_numa_interleaving_specified;
2814 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2815
2816 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2817 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2818 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2819
2820 if (os::Kernel32Dll::NumaCallsAvailable()) {
2821 if (numa_node_list_holder.build()) {
2822 if (PrintMiscellaneous && Verbose) {
2823 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2824 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2825 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2826 }
2827 tty->print("\n");
2828 }
2829 success = true;
2830 } else {
2831 WARN("Process does not cover multiple NUMA nodes.");
2832 }
2833 } else {
2834 WARN("NUMA Interleaving is not supported by the operating system.");
2835 }
2836 if (!success) {
2837 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2838 }
2839 return success;
2840 #undef WARN
2841 }
2842
2843 // this routine is used whenever we need to reserve a contiguous VA range
2844 // but we need to make separate VirtualAlloc calls for each piece of the range
2845 // Reasons for doing this:
2846 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2847 // * UseNUMAInterleaving requires a separate node for each piece
2848 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2849 bool should_inject_error=false) {
2850 char * p_buf;
2851 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2852 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2853 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2854
2855 // first reserve enough address space in advance since we want to be
2856 // able to break a single contiguous virtual address range into multiple
2857 // large page commits but WS2003 does not allow reserving large page space
2858 // so we just use 4K pages for reserve, this gives us a legal contiguous
2859 // address space. then we will deallocate that reservation, and re alloc
2860 // using large pages
2861 const size_t size_of_reserve = bytes + chunk_size;
2862 if (bytes > size_of_reserve) {
2863 // Overflowed.
2864 return NULL;
2865 }
2866 p_buf = (char *) VirtualAlloc(addr,
2867 size_of_reserve, // size of Reserve
2868 MEM_RESERVE,
2869 PAGE_READWRITE);
2870 // If reservation failed, return NULL
2871 if (p_buf == NULL) return NULL;
2872 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2873 os::release_memory(p_buf, bytes + chunk_size);
2874
2875 // we still need to round up to a page boundary (in case we are using large pages)
2876 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2877 // instead we handle this in the bytes_to_rq computation below
2878 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2879
2880 // now go through and allocate one chunk at a time until all bytes are
2881 // allocated
2882 size_t bytes_remaining = bytes;
2883 // An overflow of align_size_up() would have been caught above
2884 // in the calculation of size_of_reserve.
2885 char * next_alloc_addr = p_buf;
2886 HANDLE hProc = GetCurrentProcess();
2887
2888 #ifdef ASSERT
2889 // Variable for the failure injection
2890 long ran_num = os::random();
2891 size_t fail_after = ran_num % bytes;
2892 #endif
2893
2894 int count=0;
2895 while (bytes_remaining) {
2896 // select bytes_to_rq to get to the next chunk_size boundary
2897
2898 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2899 // Note allocate and commit
2900 char * p_new;
2901
2902 #ifdef ASSERT
2903 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2904 #else
2905 const bool inject_error_now = false;
2906 #endif
2907
2908 if (inject_error_now) {
2909 p_new = NULL;
2910 } else {
2911 if (!UseNUMAInterleaving) {
2912 p_new = (char *) VirtualAlloc(next_alloc_addr,
2913 bytes_to_rq,
2914 flags,
2915 prot);
2916 } else {
2917 // get the next node to use from the used_node_list
2918 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2919 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2920 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2921 next_alloc_addr,
2922 bytes_to_rq,
2923 flags,
2924 prot,
2925 node);
2926 }
2927 }
2928
2929 if (p_new == NULL) {
2930 // Free any allocated pages
2931 if (next_alloc_addr > p_buf) {
2932 // Some memory was committed so release it.
2933 size_t bytes_to_release = bytes - bytes_remaining;
2934 // NMT has yet to record any individual blocks, so it
2935 // need to create a dummy 'reserve' record to match
2936 // the release.
2937 MemTracker::record_virtual_memory_reserve((address)p_buf,
2938 bytes_to_release, CALLER_PC);
2939 os::release_memory(p_buf, bytes_to_release);
2940 }
2941 #ifdef ASSERT
2942 if (should_inject_error) {
2943 if (TracePageSizes && Verbose) {
2944 tty->print_cr("Reserving pages individually failed.");
2945 }
2946 }
2947 #endif
2948 return NULL;
2949 }
2950
2951 bytes_remaining -= bytes_to_rq;
2952 next_alloc_addr += bytes_to_rq;
2953 count++;
2954 }
2955 // Although the memory is allocated individually, it is returned as one.
2956 // NMT records it as one block.
2957 address pc = CALLER_PC;
2958 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, pc);
2959 if ((flags & MEM_COMMIT) != 0) {
2960 MemTracker::record_virtual_memory_commit((address)p_buf, bytes, pc);
2961 }
2962
2963 // made it this far, success
2964 return p_buf;
2965 }
2966
2967
2968
2969 void os::large_page_init() {
2970 if (!UseLargePages) return;
2971
2972 // print a warning if any large page related flag is specified on command line
2973 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2974 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2975 bool success = false;
2976
2977 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2978 if (resolve_functions_for_large_page_init()) {
2979 if (request_lock_memory_privilege()) {
2980 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2981 if (s) {
2982 #if defined(IA32) || defined(AMD64)
2983 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2984 WARN("JVM cannot use large pages bigger than 4mb.");
2985 } else {
2986 #endif
2987 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2988 _large_page_size = LargePageSizeInBytes;
2989 } else {
2990 _large_page_size = s;
2991 }
2992 success = true;
2993 #if defined(IA32) || defined(AMD64)
2994 }
2995 #endif
2996 } else {
2997 WARN("Large page is not supported by the processor.");
2998 }
2999 } else {
3000 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3001 }
3002 } else {
3003 WARN("Large page is not supported by the operating system.");
3004 }
3005 #undef WARN
3006
3007 const size_t default_page_size = (size_t) vm_page_size();
3008 if (success && _large_page_size > default_page_size) {
3009 _page_sizes[0] = _large_page_size;
3010 _page_sizes[1] = default_page_size;
3011 _page_sizes[2] = 0;
3012 }
3013
3014 cleanup_after_large_page_init();
3015 UseLargePages = success;
3016 }
3017
3018 // On win32, one cannot release just a part of reserved memory, it's an
3019 // all or nothing deal. When we split a reservation, we must break the
3020 // reservation into two reservations.
3021 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3022 bool realloc) {
3023 if (size > 0) {
3024 release_memory(base, size);
3025 if (realloc) {
3026 reserve_memory(split, base);
3027 }
3028 if (size != split) {
3029 reserve_memory(size - split, base + split);
3030 }
3031 }
3032 }
3033
3034 // Multiple threads can race in this code but it's not possible to unmap small sections of
3035 // virtual space to get requested alignment, like posix-like os's.
3036 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3037 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3038 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3039 "Alignment must be a multiple of allocation granularity (page size)");
3040 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3041
3042 size_t extra_size = size + alignment;
3043 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3044
3045 char* aligned_base = NULL;
3046
3047 do {
3048 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3049 if (extra_base == NULL) {
3050 return NULL;
3051 }
3052 // Do manual alignment
3053 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3054
3055 os::release_memory(extra_base, extra_size);
3056
3057 aligned_base = os::reserve_memory(size, aligned_base);
3058
3059 } while (aligned_base == NULL);
3060
3061 return aligned_base;
3062 }
3063
3064 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3065 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3066 "reserve alignment");
3067 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3068 char* res;
3069 // note that if UseLargePages is on, all the areas that require interleaving
3070 // will go thru reserve_memory_special rather than thru here.
3071 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3072 if (!use_individual) {
3073 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3074 } else {
3075 elapsedTimer reserveTimer;
3076 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3077 // in numa interleaving, we have to allocate pages individually
3078 // (well really chunks of NUMAInterleaveGranularity size)
3079 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3080 if (res == NULL) {
3081 warning("NUMA page allocation failed");
3082 }
3083 if( Verbose && PrintMiscellaneous ) {
3084 reserveTimer.stop();
3085 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3086 reserveTimer.milliseconds(), reserveTimer.ticks());
3087 }
3088 }
3089 assert(res == NULL || addr == NULL || addr == res,
3090 "Unexpected address from reserve.");
3091
3092 return res;
3093 }
3094
3095 // Reserve memory at an arbitrary address, only if that area is
3096 // available (and not reserved for something else).
3097 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3098 // Windows os::reserve_memory() fails of the requested address range is
3099 // not avilable.
3100 return reserve_memory(bytes, requested_addr);
3101 }
3102
3103 size_t os::large_page_size() {
3104 return _large_page_size;
3105 }
3106
3107 bool os::can_commit_large_page_memory() {
3108 // Windows only uses large page memory when the entire region is reserved
3109 // and committed in a single VirtualAlloc() call. This may change in the
3110 // future, but with Windows 2003 it's not possible to commit on demand.
3111 return false;
3112 }
3113
3114 bool os::can_execute_large_page_memory() {
3115 return true;
3116 }
3117
3118 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3119
3120 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3121 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3122
3123 // with large pages, there are two cases where we need to use Individual Allocation
3124 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3125 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3126 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3127 if (TracePageSizes && Verbose) {
3128 tty->print_cr("Reserving large pages individually.");
3129 }
3130 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3131 if (p_buf == NULL) {
3132 // give an appropriate warning message
3133 if (UseNUMAInterleaving) {
3134 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3135 }
3136 if (UseLargePagesIndividualAllocation) {
3137 warning("Individually allocated large pages failed, "
3138 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3139 }
3140 return NULL;
3141 }
3142
3143 return p_buf;
3144
3145 } else {
3146 // normal policy just allocate it all at once
3147 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3148 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3149 if (res != NULL) {
3150 address pc = CALLER_PC;
3151 MemTracker::record_virtual_memory_reserve((address)res, bytes, pc);
3152 MemTracker::record_virtual_memory_commit((address)res, bytes, pc);
3153 }
3154
3155 return res;
3156 }
3157 }
3158
3159 bool os::release_memory_special(char* base, size_t bytes) {
3160 assert(base != NULL, "Sanity check");
3161 // Memory allocated via reserve_memory_special() is committed
3162 MemTracker::record_virtual_memory_uncommit((address)base, bytes);
3163 return release_memory(base, bytes);
3164 }
3165
3166 void os::print_statistics() {
3167 }
3168
3169 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3170 if (bytes == 0) {
3171 // Don't bother the OS with noops.
3172 return true;
3173 }
3174 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3175 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3176 // Don't attempt to print anything if the OS call fails. We're
3177 // probably low on resources, so the print itself may cause crashes.
3178
3179 // unless we have NUMAInterleaving enabled, the range of a commit
3180 // is always within a reserve covered by a single VirtualAlloc
3181 // in that case we can just do a single commit for the requested size
3182 if (!UseNUMAInterleaving) {
3183 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3184 if (exec) {
3185 DWORD oldprot;
3186 // Windows doc says to use VirtualProtect to get execute permissions
3187 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3188 }
3189 return true;
3190 } else {
3191
3192 // when NUMAInterleaving is enabled, the commit might cover a range that
3193 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3194 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3195 // returns represents the number of bytes that can be committed in one step.
3196 size_t bytes_remaining = bytes;
3197 char * next_alloc_addr = addr;
3198 while (bytes_remaining > 0) {
3199 MEMORY_BASIC_INFORMATION alloc_info;
3200 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3201 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3202 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3203 return false;
3204 if (exec) {
3205 DWORD oldprot;
3206 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3207 return false;
3208 }
3209 bytes_remaining -= bytes_to_rq;
3210 next_alloc_addr += bytes_to_rq;
3211 }
3212 }
3213 // if we made it this far, return true
3214 return true;
3215 }
3216
3217 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3218 bool exec) {
3219 return commit_memory(addr, size, exec);
3220 }
3221
3222 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3223 if (bytes == 0) {
3224 // Don't bother the OS with noops.
3225 return true;
3226 }
3227 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3228 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3229 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3230 }
3231
3232 bool os::pd_release_memory(char* addr, size_t bytes) {
3233 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3234 }
3235
3236 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3237 return os::commit_memory(addr, size);
3238 }
3239
3240 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3241 return os::uncommit_memory(addr, size);
3242 }
3243
3244 // Set protections specified
3245 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3246 bool is_committed) {
3247 unsigned int p = 0;
3248 switch (prot) {
3249 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3250 case MEM_PROT_READ: p = PAGE_READONLY; break;
3251 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3252 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3253 default:
3254 ShouldNotReachHere();
3255 }
3256
3257 DWORD old_status;
3258
3259 // Strange enough, but on Win32 one can change protection only for committed
3260 // memory, not a big deal anyway, as bytes less or equal than 64K
3261 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3262 fatal("cannot commit protection page");
3263 }
3264 // One cannot use os::guard_memory() here, as on Win32 guard page
3265 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3266 //
3267 // Pages in the region become guard pages. Any attempt to access a guard page
3268 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3269 // the guard page status. Guard pages thus act as a one-time access alarm.
3270 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3271 }
3272
3273 bool os::guard_memory(char* addr, size_t bytes) {
3274 DWORD old_status;
3275 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3276 }
3277
3278 bool os::unguard_memory(char* addr, size_t bytes) {
3279 DWORD old_status;
3280 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3281 }
3282
3283 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3284 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3285 void os::numa_make_global(char *addr, size_t bytes) { }
3286 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3287 bool os::numa_topology_changed() { return false; }
3288 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3289 int os::numa_get_group_id() { return 0; }
3290 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3291 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3292 // Provide an answer for UMA systems
3293 ids[0] = 0;
3294 return 1;
3295 } else {
3296 // check for size bigger than actual groups_num
3297 size = MIN2(size, numa_get_groups_num());
3298 for (int i = 0; i < (int)size; i++) {
3299 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3300 }
3301 return size;
3302 }
3303 }
3304
3305 bool os::get_page_info(char *start, page_info* info) {
3306 return false;
3307 }
3308
3309 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3310 return end;
3311 }
3312
3313 char* os::non_memory_address_word() {
3314 // Must never look like an address returned by reserve_memory,
3315 // even in its subfields (as defined by the CPU immediate fields,
3316 // if the CPU splits constants across multiple instructions).
3317 return (char*)-1;
3318 }
3319
3320 #define MAX_ERROR_COUNT 100
3321 #define SYS_THREAD_ERROR 0xffffffffUL
3322
3323 void os::pd_start_thread(Thread* thread) {
3324 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3325 // Returns previous suspend state:
3326 // 0: Thread was not suspended
3327 // 1: Thread is running now
3328 // >1: Thread is still suspended.
3329 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3330 }
3331
3332 class HighResolutionInterval : public CHeapObj<mtThread> {
3333 // The default timer resolution seems to be 10 milliseconds.
3334 // (Where is this written down?)
3335 // If someone wants to sleep for only a fraction of the default,
3336 // then we set the timer resolution down to 1 millisecond for
3337 // the duration of their interval.
3338 // We carefully set the resolution back, since otherwise we
3339 // seem to incur an overhead (3%?) that we don't need.
3340 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3341 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3342 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3343 // timeBeginPeriod() if the relative error exceeded some threshold.
3344 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3345 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3346 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3347 // resolution timers running.
3348 private:
3349 jlong resolution;
3350 public:
3351 HighResolutionInterval(jlong ms) {
3352 resolution = ms % 10L;
3353 if (resolution != 0) {
3354 MMRESULT result = timeBeginPeriod(1L);
3355 }
3356 }
3357 ~HighResolutionInterval() {
3358 if (resolution != 0) {
3359 MMRESULT result = timeEndPeriod(1L);
3360 }
3361 resolution = 0L;
3362 }
3363 };
3364
3365 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3366 jlong limit = (jlong) MAXDWORD;
3367
3368 while(ms > limit) {
3369 int res;
3370 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3371 return res;
3372 ms -= limit;
3373 }
3374
3375 assert(thread == Thread::current(), "thread consistency check");
3376 OSThread* osthread = thread->osthread();
3377 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3378 int result;
3379 if (interruptable) {
3380 assert(thread->is_Java_thread(), "must be java thread");
3381 JavaThread *jt = (JavaThread *) thread;
3382 ThreadBlockInVM tbivm(jt);
3383
3384 jt->set_suspend_equivalent();
3385 // cleared by handle_special_suspend_equivalent_condition() or
3386 // java_suspend_self() via check_and_wait_while_suspended()
3387
3388 HANDLE events[1];
3389 events[0] = osthread->interrupt_event();
3390 HighResolutionInterval *phri=NULL;
3391 if(!ForceTimeHighResolution)
3392 phri = new HighResolutionInterval( ms );
3393 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3394 result = OS_TIMEOUT;
3395 } else {
3396 ResetEvent(osthread->interrupt_event());
3397 osthread->set_interrupted(false);
3398 result = OS_INTRPT;
3399 }
3400 delete phri; //if it is NULL, harmless
3401
3402 // were we externally suspended while we were waiting?
3403 jt->check_and_wait_while_suspended();
3404 } else {
3405 assert(!thread->is_Java_thread(), "must not be java thread");
3406 Sleep((long) ms);
3407 result = OS_TIMEOUT;
3408 }
3409 return result;
3410 }
3411
3412 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3413 void os::infinite_sleep() {
3414 while (true) { // sleep forever ...
3415 Sleep(100000); // ... 100 seconds at a time
3416 }
3417 }
3418
3419 typedef BOOL (WINAPI * STTSignature)(void) ;
3420
3421 os::YieldResult os::NakedYield() {
3422 // Use either SwitchToThread() or Sleep(0)
3423 // Consider passing back the return value from SwitchToThread().
3424 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3425 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3426 } else {
3427 Sleep(0);
3428 }
3429 return os::YIELD_UNKNOWN ;
3430 }
3431
3432 void os::yield() { os::NakedYield(); }
3433
3434 void os::yield_all(int attempts) {
3435 // Yields to all threads, including threads with lower priorities
3436 Sleep(1);
3437 }
3438
3439 // Win32 only gives you access to seven real priorities at a time,
3440 // so we compress Java's ten down to seven. It would be better
3441 // if we dynamically adjusted relative priorities.
3442
3443 int os::java_to_os_priority[CriticalPriority + 1] = {
3444 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3445 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3446 THREAD_PRIORITY_LOWEST, // 2
3447 THREAD_PRIORITY_BELOW_NORMAL, // 3
3448 THREAD_PRIORITY_BELOW_NORMAL, // 4
3449 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3450 THREAD_PRIORITY_NORMAL, // 6
3451 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3452 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3453 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3454 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3455 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3456 };
3457
3458 int prio_policy1[CriticalPriority + 1] = {
3459 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3460 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3461 THREAD_PRIORITY_LOWEST, // 2
3462 THREAD_PRIORITY_BELOW_NORMAL, // 3
3463 THREAD_PRIORITY_BELOW_NORMAL, // 4
3464 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3465 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3466 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3467 THREAD_PRIORITY_HIGHEST, // 8
3468 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3469 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3470 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3471 };
3472
3473 static int prio_init() {
3474 // If ThreadPriorityPolicy is 1, switch tables
3475 if (ThreadPriorityPolicy == 1) {
3476 int i;
3477 for (i = 0; i < CriticalPriority + 1; i++) {
3478 os::java_to_os_priority[i] = prio_policy1[i];
3479 }
3480 }
3481 if (UseCriticalJavaThreadPriority) {
3482 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3483 }
3484 return 0;
3485 }
3486
3487 OSReturn os::set_native_priority(Thread* thread, int priority) {
3488 if (!UseThreadPriorities) return OS_OK;
3489 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3490 return ret ? OS_OK : OS_ERR;
3491 }
3492
3493 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3494 if ( !UseThreadPriorities ) {
3495 *priority_ptr = java_to_os_priority[NormPriority];
3496 return OS_OK;
3497 }
3498 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3499 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3500 assert(false, "GetThreadPriority failed");
3501 return OS_ERR;
3502 }
3503 *priority_ptr = os_prio;
3504 return OS_OK;
3505 }
3506
3507
3508 // Hint to the underlying OS that a task switch would not be good.
3509 // Void return because it's a hint and can fail.
3510 void os::hint_no_preempt() {}
3511
3512 void os::interrupt(Thread* thread) {
3513 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3514 "possibility of dangling Thread pointer");
3515
3516 OSThread* osthread = thread->osthread();
3517 osthread->set_interrupted(true);
3518 // More than one thread can get here with the same value of osthread,
3519 // resulting in multiple notifications. We do, however, want the store
3520 // to interrupted() to be visible to other threads before we post
3521 // the interrupt event.
3522 OrderAccess::release();
3523 SetEvent(osthread->interrupt_event());
3524 // For JSR166: unpark after setting status
3525 if (thread->is_Java_thread())
3526 ((JavaThread*)thread)->parker()->unpark();
3527
3528 ParkEvent * ev = thread->_ParkEvent ;
3529 if (ev != NULL) ev->unpark() ;
3530
3531 }
3532
3533
3534 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3535 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3536 "possibility of dangling Thread pointer");
3537
3538 OSThread* osthread = thread->osthread();
3539 bool interrupted = osthread->interrupted();
3540 // There is no synchronization between the setting of the interrupt
3541 // and it being cleared here. It is critical - see 6535709 - that
3542 // we only clear the interrupt state, and reset the interrupt event,
3543 // if we are going to report that we were indeed interrupted - else
3544 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3545 // depending on the timing
3546 if (interrupted && clear_interrupted) {
3547 osthread->set_interrupted(false);
3548 ResetEvent(osthread->interrupt_event());
3549 } // Otherwise leave the interrupted state alone
3550
3551 return interrupted;
3552 }
3553
3554 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3555 ExtendedPC os::get_thread_pc(Thread* thread) {
3556 CONTEXT context;
3557 context.ContextFlags = CONTEXT_CONTROL;
3558 HANDLE handle = thread->osthread()->thread_handle();
3559 #ifdef _M_IA64
3560 assert(0, "Fix get_thread_pc");
3561 return ExtendedPC(NULL);
3562 #else
3563 if (GetThreadContext(handle, &context)) {
3564 #ifdef _M_AMD64
3565 return ExtendedPC((address) context.Rip);
3566 #else
3567 return ExtendedPC((address) context.Eip);
3568 #endif
3569 } else {
3570 return ExtendedPC(NULL);
3571 }
3572 #endif
3573 }
3574
3575 // GetCurrentThreadId() returns DWORD
3576 intx os::current_thread_id() { return GetCurrentThreadId(); }
3577
3578 static int _initial_pid = 0;
3579
3580 int os::current_process_id()
3581 {
3582 return (_initial_pid ? _initial_pid : _getpid());
3583 }
3584
3585 int os::win32::_vm_page_size = 0;
3586 int os::win32::_vm_allocation_granularity = 0;
3587 int os::win32::_processor_type = 0;
3588 // Processor level is not available on non-NT systems, use vm_version instead
3589 int os::win32::_processor_level = 0;
3590 julong os::win32::_physical_memory = 0;
3591 size_t os::win32::_default_stack_size = 0;
3592
3593 intx os::win32::_os_thread_limit = 0;
3594 volatile intx os::win32::_os_thread_count = 0;
3595
3596 bool os::win32::_is_nt = false;
3597 bool os::win32::_is_windows_2003 = false;
3598 bool os::win32::_is_windows_server = false;
3599
3600 void os::win32::initialize_system_info() {
3601 SYSTEM_INFO si;
3602 GetSystemInfo(&si);
3603 _vm_page_size = si.dwPageSize;
3604 _vm_allocation_granularity = si.dwAllocationGranularity;
3605 _processor_type = si.dwProcessorType;
3606 _processor_level = si.wProcessorLevel;
3607 set_processor_count(si.dwNumberOfProcessors);
3608
3609 MEMORYSTATUSEX ms;
3610 ms.dwLength = sizeof(ms);
3611
3612 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3613 // dwMemoryLoad (% of memory in use)
3614 GlobalMemoryStatusEx(&ms);
3615 _physical_memory = ms.ullTotalPhys;
3616
3617 OSVERSIONINFOEX oi;
3618 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3619 GetVersionEx((OSVERSIONINFO*)&oi);
3620 switch(oi.dwPlatformId) {
3621 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3622 case VER_PLATFORM_WIN32_NT:
3623 _is_nt = true;
3624 {
3625 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3626 if (os_vers == 5002) {
3627 _is_windows_2003 = true;
3628 }
3629 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3630 oi.wProductType == VER_NT_SERVER) {
3631 _is_windows_server = true;
3632 }
3633 }
3634 break;
3635 default: fatal("Unknown platform");
3636 }
3637
3638 _default_stack_size = os::current_stack_size();
3639 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3640 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3641 "stack size not a multiple of page size");
3642
3643 initialize_performance_counter();
3644
3645 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3646 // known to deadlock the system, if the VM issues to thread operations with
3647 // a too high frequency, e.g., such as changing the priorities.
3648 // The 6000 seems to work well - no deadlocks has been notices on the test
3649 // programs that we have seen experience this problem.
3650 if (!os::win32::is_nt()) {
3651 StarvationMonitorInterval = 6000;
3652 }
3653 }
3654
3655
3656 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3657 char path[MAX_PATH];
3658 DWORD size;
3659 DWORD pathLen = (DWORD)sizeof(path);
3660 HINSTANCE result = NULL;
3661
3662 // only allow library name without path component
3663 assert(strchr(name, '\\') == NULL, "path not allowed");
3664 assert(strchr(name, ':') == NULL, "path not allowed");
3665 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3666 jio_snprintf(ebuf, ebuflen,
3667 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3668 return NULL;
3669 }
3670
3671 // search system directory
3672 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3673 strcat(path, "\\");
3674 strcat(path, name);
3675 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3676 return result;
3677 }
3678 }
3679
3680 // try Windows directory
3681 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3682 strcat(path, "\\");
3683 strcat(path, name);
3684 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3685 return result;
3686 }
3687 }
3688
3689 jio_snprintf(ebuf, ebuflen,
3690 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3691 return NULL;
3692 }
3693
3694 void os::win32::setmode_streams() {
3695 _setmode(_fileno(stdin), _O_BINARY);
3696 _setmode(_fileno(stdout), _O_BINARY);
3697 _setmode(_fileno(stderr), _O_BINARY);
3698 }
3699
3700
3701 bool os::is_debugger_attached() {
3702 return IsDebuggerPresent() ? true : false;
3703 }
3704
3705
3706 void os::wait_for_keypress_at_exit(void) {
3707 if (PauseAtExit) {
3708 fprintf(stderr, "Press any key to continue...\n");
3709 fgetc(stdin);
3710 }
3711 }
3712
3713
3714 int os::message_box(const char* title, const char* message) {
3715 int result = MessageBox(NULL, message, title,
3716 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3717 return result == IDYES;
3718 }
3719
3720 int os::allocate_thread_local_storage() {
3721 return TlsAlloc();
3722 }
3723
3724
3725 void os::free_thread_local_storage(int index) {
3726 TlsFree(index);
3727 }
3728
3729
3730 void os::thread_local_storage_at_put(int index, void* value) {
3731 TlsSetValue(index, value);
3732 assert(thread_local_storage_at(index) == value, "Just checking");
3733 }
3734
3735
3736 void* os::thread_local_storage_at(int index) {
3737 return TlsGetValue(index);
3738 }
3739
3740
3741 #ifndef PRODUCT
3742 #ifndef _WIN64
3743 // Helpers to check whether NX protection is enabled
3744 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3745 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3746 pex->ExceptionRecord->NumberParameters > 0 &&
3747 pex->ExceptionRecord->ExceptionInformation[0] ==
3748 EXCEPTION_INFO_EXEC_VIOLATION) {
3749 return EXCEPTION_EXECUTE_HANDLER;
3750 }
3751 return EXCEPTION_CONTINUE_SEARCH;
3752 }
3753
3754 void nx_check_protection() {
3755 // If NX is enabled we'll get an exception calling into code on the stack
3756 char code[] = { (char)0xC3 }; // ret
3757 void *code_ptr = (void *)code;
3758 __try {
3759 __asm call code_ptr
3760 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3761 tty->print_raw_cr("NX protection detected.");
3762 }
3763 }
3764 #endif // _WIN64
3765 #endif // PRODUCT
3766
3767 // this is called _before_ the global arguments have been parsed
3768 void os::init(void) {
3769 _initial_pid = _getpid();
3770
3771 init_random(1234567);
3772
3773 win32::initialize_system_info();
3774 win32::setmode_streams();
3775 init_page_sizes((size_t) win32::vm_page_size());
3776
3777 // For better scalability on MP systems (must be called after initialize_system_info)
3778 #ifndef PRODUCT
3779 if (is_MP()) {
3780 NoYieldsInMicrolock = true;
3781 }
3782 #endif
3783 // This may be overridden later when argument processing is done.
3784 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3785 os::win32::is_windows_2003());
3786
3787 // Initialize main_process and main_thread
3788 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3789 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3790 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3791 fatal("DuplicateHandle failed\n");
3792 }
3793 main_thread_id = (int) GetCurrentThreadId();
3794 }
3795
3796 // To install functions for atexit processing
3797 extern "C" {
3798 static void perfMemory_exit_helper() {
3799 perfMemory_exit();
3800 }
3801 }
3802
3803 static jint initSock();
3804
3805 // this is called _after_ the global arguments have been parsed
3806 jint os::init_2(void) {
3807 // Allocate a single page and mark it as readable for safepoint polling
3808 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3809 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3810
3811 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3812 guarantee( return_page != NULL, "Commit Failed for polling page");
3813
3814 os::set_polling_page( polling_page );
3815
3816 #ifndef PRODUCT
3817 if( Verbose && PrintMiscellaneous )
3818 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3819 #endif
3820
3821 if (!UseMembar) {
3822 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3823 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3824
3825 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3826 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3827
3828 os::set_memory_serialize_page( mem_serialize_page );
3829
3830 #ifndef PRODUCT
3831 if(Verbose && PrintMiscellaneous)
3832 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3833 #endif
3834 }
3835
3836 os::large_page_init();
3837
3838 // Setup Windows Exceptions
3839
3840 // for debugging float code generation bugs
3841 if (ForceFloatExceptions) {
3842 #ifndef _WIN64
3843 static long fp_control_word = 0;
3844 __asm { fstcw fp_control_word }
3845 // see Intel PPro Manual, Vol. 2, p 7-16
3846 const long precision = 0x20;
3847 const long underflow = 0x10;
3848 const long overflow = 0x08;
3849 const long zero_div = 0x04;
3850 const long denorm = 0x02;
3851 const long invalid = 0x01;
3852 fp_control_word |= invalid;
3853 __asm { fldcw fp_control_word }
3854 #endif
3855 }
3856
3857 // If stack_commit_size is 0, windows will reserve the default size,
3858 // but only commit a small portion of it.
3859 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3860 size_t default_reserve_size = os::win32::default_stack_size();
3861 size_t actual_reserve_size = stack_commit_size;
3862 if (stack_commit_size < default_reserve_size) {
3863 // If stack_commit_size == 0, we want this too
3864 actual_reserve_size = default_reserve_size;
3865 }
3866
3867 // Check minimum allowable stack size for thread creation and to initialize
3868 // the java system classes, including StackOverflowError - depends on page
3869 // size. Add a page for compiler2 recursion in main thread.
3870 // Add in 2*BytesPerWord times page size to account for VM stack during
3871 // class initialization depending on 32 or 64 bit VM.
3872 size_t min_stack_allowed =
3873 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3874 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3875 if (actual_reserve_size < min_stack_allowed) {
3876 tty->print_cr("\nThe stack size specified is too small, "
3877 "Specify at least %dk",
3878 min_stack_allowed / K);
3879 return JNI_ERR;
3880 }
3881
3882 JavaThread::set_stack_size_at_create(stack_commit_size);
3883
3884 // Calculate theoretical max. size of Threads to guard gainst artifical
3885 // out-of-memory situations, where all available address-space has been
3886 // reserved by thread stacks.
3887 assert(actual_reserve_size != 0, "Must have a stack");
3888
3889 // Calculate the thread limit when we should start doing Virtual Memory
3890 // banging. Currently when the threads will have used all but 200Mb of space.
3891 //
3892 // TODO: consider performing a similar calculation for commit size instead
3893 // as reserve size, since on a 64-bit platform we'll run into that more
3894 // often than running out of virtual memory space. We can use the
3895 // lower value of the two calculations as the os_thread_limit.
3896 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3897 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3898
3899 // at exit methods are called in the reverse order of their registration.
3900 // there is no limit to the number of functions registered. atexit does
3901 // not set errno.
3902
3903 if (PerfAllowAtExitRegistration) {
3904 // only register atexit functions if PerfAllowAtExitRegistration is set.
3905 // atexit functions can be delayed until process exit time, which
3906 // can be problematic for embedded VM situations. Embedded VMs should
3907 // call DestroyJavaVM() to assure that VM resources are released.
3908
3909 // note: perfMemory_exit_helper atexit function may be removed in
3910 // the future if the appropriate cleanup code can be added to the
3911 // VM_Exit VMOperation's doit method.
3912 if (atexit(perfMemory_exit_helper) != 0) {
3913 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3914 }
3915 }
3916
3917 #ifndef _WIN64
3918 // Print something if NX is enabled (win32 on AMD64)
3919 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3920 #endif
3921
3922 // initialize thread priority policy
3923 prio_init();
3924
3925 if (UseNUMA && !ForceNUMA) {
3926 UseNUMA = false; // We don't fully support this yet
3927 }
3928
3929 if (UseNUMAInterleaving) {
3930 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3931 bool success = numa_interleaving_init();
3932 if (!success) UseNUMAInterleaving = false;
3933 }
3934
3935 if (initSock() != JNI_OK) {
3936 return JNI_ERR;
3937 }
3938
3939 return JNI_OK;
3940 }
3941
3942 void os::init_3(void) {
3943 return;
3944 }
3945
3946 // Mark the polling page as unreadable
3947 void os::make_polling_page_unreadable(void) {
3948 DWORD old_status;
3949 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3950 fatal("Could not disable polling page");
3951 };
3952
3953 // Mark the polling page as readable
3954 void os::make_polling_page_readable(void) {
3955 DWORD old_status;
3956 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3957 fatal("Could not enable polling page");
3958 };
3959
3960
3961 int os::stat(const char *path, struct stat *sbuf) {
3962 char pathbuf[MAX_PATH];
3963 if (strlen(path) > MAX_PATH - 1) {
3964 errno = ENAMETOOLONG;
3965 return -1;
3966 }
3967 os::native_path(strcpy(pathbuf, path));
3968 int ret = ::stat(pathbuf, sbuf);
3969 if (sbuf != NULL && UseUTCFileTimestamp) {
3970 // Fix for 6539723. st_mtime returned from stat() is dependent on
3971 // the system timezone and so can return different values for the
3972 // same file if/when daylight savings time changes. This adjustment
3973 // makes sure the same timestamp is returned regardless of the TZ.
3974 //
3975 // See:
3976 // http://msdn.microsoft.com/library/
3977 // default.asp?url=/library/en-us/sysinfo/base/
3978 // time_zone_information_str.asp
3979 // and
3980 // http://msdn.microsoft.com/library/default.asp?url=
3981 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3982 //
3983 // NOTE: there is a insidious bug here: If the timezone is changed
3984 // after the call to stat() but before 'GetTimeZoneInformation()', then
3985 // the adjustment we do here will be wrong and we'll return the wrong
3986 // value (which will likely end up creating an invalid class data
3987 // archive). Absent a better API for this, or some time zone locking
3988 // mechanism, we'll have to live with this risk.
3989 TIME_ZONE_INFORMATION tz;
3990 DWORD tzid = GetTimeZoneInformation(&tz);
3991 int daylightBias =
3992 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3993 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3994 }
3995 return ret;
3996 }
3997
3998
3999 #define FT2INT64(ft) \
4000 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4001
4002
4003 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4004 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4005 // of a thread.
4006 //
4007 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4008 // the fast estimate available on the platform.
4009
4010 // current_thread_cpu_time() is not optimized for Windows yet
4011 jlong os::current_thread_cpu_time() {
4012 // return user + sys since the cost is the same
4013 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4014 }
4015
4016 jlong os::thread_cpu_time(Thread* thread) {
4017 // consistent with what current_thread_cpu_time() returns.
4018 return os::thread_cpu_time(thread, true /* user+sys */);
4019 }
4020
4021 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4022 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4023 }
4024
4025 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4026 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4027 // If this function changes, os::is_thread_cpu_time_supported() should too
4028 if (os::win32::is_nt()) {
4029 FILETIME CreationTime;
4030 FILETIME ExitTime;
4031 FILETIME KernelTime;
4032 FILETIME UserTime;
4033
4034 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4035 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4036 return -1;
4037 else
4038 if (user_sys_cpu_time) {
4039 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4040 } else {
4041 return FT2INT64(UserTime) * 100;
4042 }
4043 } else {
4044 return (jlong) timeGetTime() * 1000000;
4045 }
4046 }
4047
4048 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4049 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4050 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4051 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4052 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4053 }
4054
4055 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4056 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4057 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4058 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4059 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4060 }
4061
4062 bool os::is_thread_cpu_time_supported() {
4063 // see os::thread_cpu_time
4064 if (os::win32::is_nt()) {
4065 FILETIME CreationTime;
4066 FILETIME ExitTime;
4067 FILETIME KernelTime;
4068 FILETIME UserTime;
4069
4070 if ( GetThreadTimes(GetCurrentThread(),
4071 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4072 return false;
4073 else
4074 return true;
4075 } else {
4076 return false;
4077 }
4078 }
4079
4080 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4081 // It does have primitives (PDH API) to get CPU usage and run queue length.
4082 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4083 // If we wanted to implement loadavg on Windows, we have a few options:
4084 //
4085 // a) Query CPU usage and run queue length and "fake" an answer by
4086 // returning the CPU usage if it's under 100%, and the run queue
4087 // length otherwise. It turns out that querying is pretty slow
4088 // on Windows, on the order of 200 microseconds on a fast machine.
4089 // Note that on the Windows the CPU usage value is the % usage
4090 // since the last time the API was called (and the first call
4091 // returns 100%), so we'd have to deal with that as well.
4092 //
4093 // b) Sample the "fake" answer using a sampling thread and store
4094 // the answer in a global variable. The call to loadavg would
4095 // just return the value of the global, avoiding the slow query.
4096 //
4097 // c) Sample a better answer using exponential decay to smooth the
4098 // value. This is basically the algorithm used by UNIX kernels.
4099 //
4100 // Note that sampling thread starvation could affect both (b) and (c).
4101 int os::loadavg(double loadavg[], int nelem) {
4102 return -1;
4103 }
4104
4105
4106 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4107 bool os::dont_yield() {
4108 return DontYieldALot;
4109 }
4110
4111 // This method is a slightly reworked copy of JDK's sysOpen
4112 // from src/windows/hpi/src/sys_api_md.c
4113
4114 int os::open(const char *path, int oflag, int mode) {
4115 char pathbuf[MAX_PATH];
4116
4117 if (strlen(path) > MAX_PATH - 1) {
4118 errno = ENAMETOOLONG;
4119 return -1;
4120 }
4121 os::native_path(strcpy(pathbuf, path));
4122 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4123 }
4124
4125 FILE* os::open(int fd, const char* mode) {
4126 return ::_fdopen(fd, mode);
4127 }
4128
4129 // Is a (classpath) directory empty?
4130 bool os::dir_is_empty(const char* path) {
4131 WIN32_FIND_DATA fd;
4132 HANDLE f = FindFirstFile(path, &fd);
4133 if (f == INVALID_HANDLE_VALUE) {
4134 return true;
4135 }
4136 FindClose(f);
4137 return false;
4138 }
4139
4140 // create binary file, rewriting existing file if required
4141 int os::create_binary_file(const char* path, bool rewrite_existing) {
4142 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4143 if (!rewrite_existing) {
4144 oflags |= _O_EXCL;
4145 }
4146 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4147 }
4148
4149 // return current position of file pointer
4150 jlong os::current_file_offset(int fd) {
4151 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4152 }
4153
4154 // move file pointer to the specified offset
4155 jlong os::seek_to_file_offset(int fd, jlong offset) {
4156 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4157 }
4158
4159
4160 jlong os::lseek(int fd, jlong offset, int whence) {
4161 return (jlong) ::_lseeki64(fd, offset, whence);
4162 }
4163
4164 // This method is a slightly reworked copy of JDK's sysNativePath
4165 // from src/windows/hpi/src/path_md.c
4166
4167 /* Convert a pathname to native format. On win32, this involves forcing all
4168 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4169 sometimes rejects '/') and removing redundant separators. The input path is
4170 assumed to have been converted into the character encoding used by the local
4171 system. Because this might be a double-byte encoding, care is taken to
4172 treat double-byte lead characters correctly.
4173
4174 This procedure modifies the given path in place, as the result is never
4175 longer than the original. There is no error return; this operation always
4176 succeeds. */
4177 char * os::native_path(char *path) {
4178 char *src = path, *dst = path, *end = path;
4179 char *colon = NULL; /* If a drive specifier is found, this will
4180 point to the colon following the drive
4181 letter */
4182
4183 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4184 assert(((!::IsDBCSLeadByte('/'))
4185 && (!::IsDBCSLeadByte('\\'))
4186 && (!::IsDBCSLeadByte(':'))),
4187 "Illegal lead byte");
4188
4189 /* Check for leading separators */
4190 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4191 while (isfilesep(*src)) {
4192 src++;
4193 }
4194
4195 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4196 /* Remove leading separators if followed by drive specifier. This
4197 hack is necessary to support file URLs containing drive
4198 specifiers (e.g., "file://c:/path"). As a side effect,
4199 "/c:/path" can be used as an alternative to "c:/path". */
4200 *dst++ = *src++;
4201 colon = dst;
4202 *dst++ = ':';
4203 src++;
4204 } else {
4205 src = path;
4206 if (isfilesep(src[0]) && isfilesep(src[1])) {
4207 /* UNC pathname: Retain first separator; leave src pointed at
4208 second separator so that further separators will be collapsed
4209 into the second separator. The result will be a pathname
4210 beginning with "\\\\" followed (most likely) by a host name. */
4211 src = dst = path + 1;
4212 path[0] = '\\'; /* Force first separator to '\\' */
4213 }
4214 }
4215
4216 end = dst;
4217
4218 /* Remove redundant separators from remainder of path, forcing all
4219 separators to be '\\' rather than '/'. Also, single byte space
4220 characters are removed from the end of the path because those
4221 are not legal ending characters on this operating system.
4222 */
4223 while (*src != '\0') {
4224 if (isfilesep(*src)) {
4225 *dst++ = '\\'; src++;
4226 while (isfilesep(*src)) src++;
4227 if (*src == '\0') {
4228 /* Check for trailing separator */
4229 end = dst;
4230 if (colon == dst - 2) break; /* "z:\\" */
4231 if (dst == path + 1) break; /* "\\" */
4232 if (dst == path + 2 && isfilesep(path[0])) {
4233 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4234 beginning of a UNC pathname. Even though it is not, by
4235 itself, a valid UNC pathname, we leave it as is in order
4236 to be consistent with the path canonicalizer as well
4237 as the win32 APIs, which treat this case as an invalid
4238 UNC pathname rather than as an alias for the root
4239 directory of the current drive. */
4240 break;
4241 }
4242 end = --dst; /* Path does not denote a root directory, so
4243 remove trailing separator */
4244 break;
4245 }
4246 end = dst;
4247 } else {
4248 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4249 *dst++ = *src++;
4250 if (*src) *dst++ = *src++;
4251 end = dst;
4252 } else { /* Copy a single-byte character */
4253 char c = *src++;
4254 *dst++ = c;
4255 /* Space is not a legal ending character */
4256 if (c != ' ') end = dst;
4257 }
4258 }
4259 }
4260
4261 *end = '\0';
4262
4263 /* For "z:", add "." to work around a bug in the C runtime library */
4264 if (colon == dst - 1) {
4265 path[2] = '.';
4266 path[3] = '\0';
4267 }
4268
4269 return path;
4270 }
4271
4272 // This code is a copy of JDK's sysSetLength
4273 // from src/windows/hpi/src/sys_api_md.c
4274
4275 int os::ftruncate(int fd, jlong length) {
4276 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4277 long high = (long)(length >> 32);
4278 DWORD ret;
4279
4280 if (h == (HANDLE)(-1)) {
4281 return -1;
4282 }
4283
4284 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4285 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4286 return -1;
4287 }
4288
4289 if (::SetEndOfFile(h) == FALSE) {
4290 return -1;
4291 }
4292
4293 return 0;
4294 }
4295
4296
4297 // This code is a copy of JDK's sysSync
4298 // from src/windows/hpi/src/sys_api_md.c
4299 // except for the legacy workaround for a bug in Win 98
4300
4301 int os::fsync(int fd) {
4302 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4303
4304 if ( (!::FlushFileBuffers(handle)) &&
4305 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4306 /* from winerror.h */
4307 return -1;
4308 }
4309 return 0;
4310 }
4311
4312 static int nonSeekAvailable(int, long *);
4313 static int stdinAvailable(int, long *);
4314
4315 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4316 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4317
4318 // This code is a copy of JDK's sysAvailable
4319 // from src/windows/hpi/src/sys_api_md.c
4320
4321 int os::available(int fd, jlong *bytes) {
4322 jlong cur, end;
4323 struct _stati64 stbuf64;
4324
4325 if (::_fstati64(fd, &stbuf64) >= 0) {
4326 int mode = stbuf64.st_mode;
4327 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4328 int ret;
4329 long lpbytes;
4330 if (fd == 0) {
4331 ret = stdinAvailable(fd, &lpbytes);
4332 } else {
4333 ret = nonSeekAvailable(fd, &lpbytes);
4334 }
4335 (*bytes) = (jlong)(lpbytes);
4336 return ret;
4337 }
4338 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4339 return FALSE;
4340 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4341 return FALSE;
4342 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4343 return FALSE;
4344 }
4345 *bytes = end - cur;
4346 return TRUE;
4347 } else {
4348 return FALSE;
4349 }
4350 }
4351
4352 // This code is a copy of JDK's nonSeekAvailable
4353 // from src/windows/hpi/src/sys_api_md.c
4354
4355 static int nonSeekAvailable(int fd, long *pbytes) {
4356 /* This is used for available on non-seekable devices
4357 * (like both named and anonymous pipes, such as pipes
4358 * connected to an exec'd process).
4359 * Standard Input is a special case.
4360 *
4361 */
4362 HANDLE han;
4363
4364 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4365 return FALSE;
4366 }
4367
4368 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4369 /* PeekNamedPipe fails when at EOF. In that case we
4370 * simply make *pbytes = 0 which is consistent with the
4371 * behavior we get on Solaris when an fd is at EOF.
4372 * The only alternative is to raise an Exception,
4373 * which isn't really warranted.
4374 */
4375 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4376 return FALSE;
4377 }
4378 *pbytes = 0;
4379 }
4380 return TRUE;
4381 }
4382
4383 #define MAX_INPUT_EVENTS 2000
4384
4385 // This code is a copy of JDK's stdinAvailable
4386 // from src/windows/hpi/src/sys_api_md.c
4387
4388 static int stdinAvailable(int fd, long *pbytes) {
4389 HANDLE han;
4390 DWORD numEventsRead = 0; /* Number of events read from buffer */
4391 DWORD numEvents = 0; /* Number of events in buffer */
4392 DWORD i = 0; /* Loop index */
4393 DWORD curLength = 0; /* Position marker */
4394 DWORD actualLength = 0; /* Number of bytes readable */
4395 BOOL error = FALSE; /* Error holder */
4396 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4397
4398 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4399 return FALSE;
4400 }
4401
4402 /* Construct an array of input records in the console buffer */
4403 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4404 if (error == 0) {
4405 return nonSeekAvailable(fd, pbytes);
4406 }
4407
4408 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4409 if (numEvents > MAX_INPUT_EVENTS) {
4410 numEvents = MAX_INPUT_EVENTS;
4411 }
4412
4413 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4414 if (lpBuffer == NULL) {
4415 return FALSE;
4416 }
4417
4418 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4419 if (error == 0) {
4420 os::free(lpBuffer, mtInternal);
4421 return FALSE;
4422 }
4423
4424 /* Examine input records for the number of bytes available */
4425 for(i=0; i<numEvents; i++) {
4426 if (lpBuffer[i].EventType == KEY_EVENT) {
4427
4428 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4429 &(lpBuffer[i].Event);
4430 if (keyRecord->bKeyDown == TRUE) {
4431 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4432 curLength++;
4433 if (*keyPressed == '\r') {
4434 actualLength = curLength;
4435 }
4436 }
4437 }
4438 }
4439
4440 if(lpBuffer != NULL) {
4441 os::free(lpBuffer, mtInternal);
4442 }
4443
4444 *pbytes = (long) actualLength;
4445 return TRUE;
4446 }
4447
4448 // Map a block of memory.
4449 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4450 char *addr, size_t bytes, bool read_only,
4451 bool allow_exec) {
4452 HANDLE hFile;
4453 char* base;
4454
4455 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4456 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4457 if (hFile == NULL) {
4458 if (PrintMiscellaneous && Verbose) {
4459 DWORD err = GetLastError();
4460 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4461 }
4462 return NULL;
4463 }
4464
4465 if (allow_exec) {
4466 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4467 // unless it comes from a PE image (which the shared archive is not.)
4468 // Even VirtualProtect refuses to give execute access to mapped memory
4469 // that was not previously executable.
4470 //
4471 // Instead, stick the executable region in anonymous memory. Yuck.
4472 // Penalty is that ~4 pages will not be shareable - in the future
4473 // we might consider DLLizing the shared archive with a proper PE
4474 // header so that mapping executable + sharing is possible.
4475
4476 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4477 PAGE_READWRITE);
4478 if (base == NULL) {
4479 if (PrintMiscellaneous && Verbose) {
4480 DWORD err = GetLastError();
4481 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4482 }
4483 CloseHandle(hFile);
4484 return NULL;
4485 }
4486
4487 DWORD bytes_read;
4488 OVERLAPPED overlapped;
4489 overlapped.Offset = (DWORD)file_offset;
4490 overlapped.OffsetHigh = 0;
4491 overlapped.hEvent = NULL;
4492 // ReadFile guarantees that if the return value is true, the requested
4493 // number of bytes were read before returning.
4494 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4495 if (!res) {
4496 if (PrintMiscellaneous && Verbose) {
4497 DWORD err = GetLastError();
4498 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4499 }
4500 release_memory(base, bytes);
4501 CloseHandle(hFile);
4502 return NULL;
4503 }
4504 } else {
4505 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4506 NULL /*file_name*/);
4507 if (hMap == NULL) {
4508 if (PrintMiscellaneous && Verbose) {
4509 DWORD err = GetLastError();
4510 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4511 }
4512 CloseHandle(hFile);
4513 return NULL;
4514 }
4515
4516 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4517 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4518 (DWORD)bytes, addr);
4519 if (base == NULL) {
4520 if (PrintMiscellaneous && Verbose) {
4521 DWORD err = GetLastError();
4522 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4523 }
4524 CloseHandle(hMap);
4525 CloseHandle(hFile);
4526 return NULL;
4527 }
4528
4529 if (CloseHandle(hMap) == 0) {
4530 if (PrintMiscellaneous && Verbose) {
4531 DWORD err = GetLastError();
4532 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4533 }
4534 CloseHandle(hFile);
4535 return base;
4536 }
4537 }
4538
4539 if (allow_exec) {
4540 DWORD old_protect;
4541 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4542 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4543
4544 if (!res) {
4545 if (PrintMiscellaneous && Verbose) {
4546 DWORD err = GetLastError();
4547 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4548 }
4549 // Don't consider this a hard error, on IA32 even if the
4550 // VirtualProtect fails, we should still be able to execute
4551 CloseHandle(hFile);
4552 return base;
4553 }
4554 }
4555
4556 if (CloseHandle(hFile) == 0) {
4557 if (PrintMiscellaneous && Verbose) {
4558 DWORD err = GetLastError();
4559 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4560 }
4561 return base;
4562 }
4563
4564 return base;
4565 }
4566
4567
4568 // Remap a block of memory.
4569 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4570 char *addr, size_t bytes, bool read_only,
4571 bool allow_exec) {
4572 // This OS does not allow existing memory maps to be remapped so we
4573 // have to unmap the memory before we remap it.
4574 if (!os::unmap_memory(addr, bytes)) {
4575 return NULL;
4576 }
4577
4578 // There is a very small theoretical window between the unmap_memory()
4579 // call above and the map_memory() call below where a thread in native
4580 // code may be able to access an address that is no longer mapped.
4581
4582 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4583 read_only, allow_exec);
4584 }
4585
4586
4587 // Unmap a block of memory.
4588 // Returns true=success, otherwise false.
4589
4590 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4591 BOOL result = UnmapViewOfFile(addr);
4592 if (result == 0) {
4593 if (PrintMiscellaneous && Verbose) {
4594 DWORD err = GetLastError();
4595 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4596 }
4597 return false;
4598 }
4599 return true;
4600 }
4601
4602 void os::pause() {
4603 char filename[MAX_PATH];
4604 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4605 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4606 } else {
4607 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4608 }
4609
4610 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4611 if (fd != -1) {
4612 struct stat buf;
4613 ::close(fd);
4614 while (::stat(filename, &buf) == 0) {
4615 Sleep(100);
4616 }
4617 } else {
4618 jio_fprintf(stderr,
4619 "Could not open pause file '%s', continuing immediately.\n", filename);
4620 }
4621 }
4622
4623 // An Event wraps a win32 "CreateEvent" kernel handle.
4624 //
4625 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4626 //
4627 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4628 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4629 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4630 // In addition, an unpark() operation might fetch the handle field, but the
4631 // event could recycle between the fetch and the SetEvent() operation.
4632 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4633 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4634 // on an stale but recycled handle would be harmless, but in practice this might
4635 // confuse other non-Sun code, so it's not a viable approach.
4636 //
4637 // 2: Once a win32 event handle is associated with an Event, it remains associated
4638 // with the Event. The event handle is never closed. This could be construed
4639 // as handle leakage, but only up to the maximum # of threads that have been extant
4640 // at any one time. This shouldn't be an issue, as windows platforms typically
4641 // permit a process to have hundreds of thousands of open handles.
4642 //
4643 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4644 // and release unused handles.
4645 //
4646 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4647 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4648 //
4649 // 5. Use an RCU-like mechanism (Read-Copy Update).
4650 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4651 //
4652 // We use (2).
4653 //
4654 // TODO-FIXME:
4655 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4656 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4657 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4658 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4659 // into a single win32 CreateEvent() handle.
4660 //
4661 // _Event transitions in park()
4662 // -1 => -1 : illegal
4663 // 1 => 0 : pass - return immediately
4664 // 0 => -1 : block
4665 //
4666 // _Event serves as a restricted-range semaphore :
4667 // -1 : thread is blocked
4668 // 0 : neutral - thread is running or ready
4669 // 1 : signaled - thread is running or ready
4670 //
4671 // Another possible encoding of _Event would be
4672 // with explicit "PARKED" and "SIGNALED" bits.
4673
4674 int os::PlatformEvent::park (jlong Millis) {
4675 guarantee (_ParkHandle != NULL , "Invariant") ;
4676 guarantee (Millis > 0 , "Invariant") ;
4677 int v ;
4678
4679 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4680 // the initial park() operation.
4681
4682 for (;;) {
4683 v = _Event ;
4684 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4685 }
4686 guarantee ((v == 0) || (v == 1), "invariant") ;
4687 if (v != 0) return OS_OK ;
4688
4689 // Do this the hard way by blocking ...
4690 // TODO: consider a brief spin here, gated on the success of recent
4691 // spin attempts by this thread.
4692 //
4693 // We decompose long timeouts into series of shorter timed waits.
4694 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4695 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4696 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4697 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4698 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4699 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4700 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4701 // for the already waited time. This policy does not admit any new outcomes.
4702 // In the future, however, we might want to track the accumulated wait time and
4703 // adjust Millis accordingly if we encounter a spurious wakeup.
4704
4705 const int MAXTIMEOUT = 0x10000000 ;
4706 DWORD rv = WAIT_TIMEOUT ;
4707 while (_Event < 0 && Millis > 0) {
4708 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4709 if (Millis > MAXTIMEOUT) {
4710 prd = MAXTIMEOUT ;
4711 }
4712 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4713 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4714 if (rv == WAIT_TIMEOUT) {
4715 Millis -= prd ;
4716 }
4717 }
4718 v = _Event ;
4719 _Event = 0 ;
4720 // see comment at end of os::PlatformEvent::park() below:
4721 OrderAccess::fence() ;
4722 // If we encounter a nearly simultanous timeout expiry and unpark()
4723 // we return OS_OK indicating we awoke via unpark().
4724 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4725 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4726 }
4727
4728 void os::PlatformEvent::park () {
4729 guarantee (_ParkHandle != NULL, "Invariant") ;
4730 // Invariant: Only the thread associated with the Event/PlatformEvent
4731 // may call park().
4732 int v ;
4733 for (;;) {
4734 v = _Event ;
4735 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4736 }
4737 guarantee ((v == 0) || (v == 1), "invariant") ;
4738 if (v != 0) return ;
4739
4740 // Do this the hard way by blocking ...
4741 // TODO: consider a brief spin here, gated on the success of recent
4742 // spin attempts by this thread.
4743 while (_Event < 0) {
4744 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4745 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4746 }
4747
4748 // Usually we'll find _Event == 0 at this point, but as
4749 // an optional optimization we clear it, just in case can
4750 // multiple unpark() operations drove _Event up to 1.
4751 _Event = 0 ;
4752 OrderAccess::fence() ;
4753 guarantee (_Event >= 0, "invariant") ;
4754 }
4755
4756 void os::PlatformEvent::unpark() {
4757 guarantee (_ParkHandle != NULL, "Invariant") ;
4758
4759 // Transitions for _Event:
4760 // 0 :=> 1
4761 // 1 :=> 1
4762 // -1 :=> either 0 or 1; must signal target thread
4763 // That is, we can safely transition _Event from -1 to either
4764 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4765 // unpark() calls.
4766 // See also: "Semaphores in Plan 9" by Mullender & Cox
4767 //
4768 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4769 // that it will take two back-to-back park() calls for the owning
4770 // thread to block. This has the benefit of forcing a spurious return
4771 // from the first park() call after an unpark() call which will help
4772 // shake out uses of park() and unpark() without condition variables.
4773
4774 if (Atomic::xchg(1, &_Event) >= 0) return;
4775
4776 ::SetEvent(_ParkHandle);
4777 }
4778
4779
4780 // JSR166
4781 // -------------------------------------------------------
4782
4783 /*
4784 * The Windows implementation of Park is very straightforward: Basic
4785 * operations on Win32 Events turn out to have the right semantics to
4786 * use them directly. We opportunistically resuse the event inherited
4787 * from Monitor.
4788 */
4789
4790
4791 void Parker::park(bool isAbsolute, jlong time) {
4792 guarantee (_ParkEvent != NULL, "invariant") ;
4793 // First, demultiplex/decode time arguments
4794 if (time < 0) { // don't wait
4795 return;
4796 }
4797 else if (time == 0 && !isAbsolute) {
4798 time = INFINITE;
4799 }
4800 else if (isAbsolute) {
4801 time -= os::javaTimeMillis(); // convert to relative time
4802 if (time <= 0) // already elapsed
4803 return;
4804 }
4805 else { // relative
4806 time /= 1000000; // Must coarsen from nanos to millis
4807 if (time == 0) // Wait for the minimal time unit if zero
4808 time = 1;
4809 }
4810
4811 JavaThread* thread = (JavaThread*)(Thread::current());
4812 assert(thread->is_Java_thread(), "Must be JavaThread");
4813 JavaThread *jt = (JavaThread *)thread;
4814
4815 // Don't wait if interrupted or already triggered
4816 if (Thread::is_interrupted(thread, false) ||
4817 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4818 ResetEvent(_ParkEvent);
4819 return;
4820 }
4821 else {
4822 ThreadBlockInVM tbivm(jt);
4823 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4824 jt->set_suspend_equivalent();
4825
4826 WaitForSingleObject(_ParkEvent, time);
4827 ResetEvent(_ParkEvent);
4828
4829 // If externally suspended while waiting, re-suspend
4830 if (jt->handle_special_suspend_equivalent_condition()) {
4831 jt->java_suspend_self();
4832 }
4833 }
4834 }
4835
4836 void Parker::unpark() {
4837 guarantee (_ParkEvent != NULL, "invariant") ;
4838 SetEvent(_ParkEvent);
4839 }
4840
4841 // Run the specified command in a separate process. Return its exit value,
4842 // or -1 on failure (e.g. can't create a new process).
4843 int os::fork_and_exec(char* cmd) {
4844 STARTUPINFO si;
4845 PROCESS_INFORMATION pi;
4846
4847 memset(&si, 0, sizeof(si));
4848 si.cb = sizeof(si);
4849 memset(&pi, 0, sizeof(pi));
4850 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4851 cmd, // command line
4852 NULL, // process security attribute
4853 NULL, // thread security attribute
4854 TRUE, // inherits system handles
4855 0, // no creation flags
4856 NULL, // use parent's environment block
4857 NULL, // use parent's starting directory
4858 &si, // (in) startup information
4859 &pi); // (out) process information
4860
4861 if (rslt) {
4862 // Wait until child process exits.
4863 WaitForSingleObject(pi.hProcess, INFINITE);
4864
4865 DWORD exit_code;
4866 GetExitCodeProcess(pi.hProcess, &exit_code);
4867
4868 // Close process and thread handles.
4869 CloseHandle(pi.hProcess);
4870 CloseHandle(pi.hThread);
4871
4872 return (int)exit_code;
4873 } else {
4874 return -1;
4875 }
4876 }
4877
4878 //--------------------------------------------------------------------------------------------------
4879 // Non-product code
4880
4881 static int mallocDebugIntervalCounter = 0;
4882 static int mallocDebugCounter = 0;
4883 bool os::check_heap(bool force) {
4884 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4885 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4886 // Note: HeapValidate executes two hardware breakpoints when it finds something
4887 // wrong; at these points, eax contains the address of the offending block (I think).
4888 // To get to the exlicit error message(s) below, just continue twice.
4889 HANDLE heap = GetProcessHeap();
4890 { HeapLock(heap);
4891 PROCESS_HEAP_ENTRY phe;
4892 phe.lpData = NULL;
4893 while (HeapWalk(heap, &phe) != 0) {
4894 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4895 !HeapValidate(heap, 0, phe.lpData)) {
4896 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4897 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4898 fatal("corrupted C heap");
4899 }
4900 }
4901 DWORD err = GetLastError();
4902 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4903 fatal(err_msg("heap walk aborted with error %d", err));
4904 }
4905 HeapUnlock(heap);
4906 }
4907 mallocDebugIntervalCounter = 0;
4908 }
4909 return true;
4910 }
4911
4912
4913 bool os::find(address addr, outputStream* st) {
4914 // Nothing yet
4915 return false;
4916 }
4917
4918 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4919 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4920
4921 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4922 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4923 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4924 address addr = (address) exceptionRecord->ExceptionInformation[1];
4925
4926 if (os::is_memory_serialize_page(thread, addr))
4927 return EXCEPTION_CONTINUE_EXECUTION;
4928 }
4929
4930 return EXCEPTION_CONTINUE_SEARCH;
4931 }
4932
4933 // We don't build a headless jre for Windows
4934 bool os::is_headless_jre() { return false; }
4935
4936 static jint initSock() {
4937 WSADATA wsadata;
4938
4939 if (!os::WinSock2Dll::WinSock2Available()) {
4940 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
4941 ::GetLastError());
4942 return JNI_ERR;
4943 }
4944
4945 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
4946 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
4947 ::GetLastError());
4948 return JNI_ERR;
4949 }
4950 return JNI_OK;
4951 }
4952
4953 struct hostent* os::get_host_by_name(char* name) {
4954 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4955 }
4956
4957 int os::socket_close(int fd) {
4958 return ::closesocket(fd);
4959 }
4960
4961 int os::socket_available(int fd, jint *pbytes) {
4962 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4963 return (ret < 0) ? 0 : 1;
4964 }
4965
4966 int os::socket(int domain, int type, int protocol) {
4967 return ::socket(domain, type, protocol);
4968 }
4969
4970 int os::listen(int fd, int count) {
4971 return ::listen(fd, count);
4972 }
4973
4974 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4975 return ::connect(fd, him, len);
4976 }
4977
4978 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4979 return ::accept(fd, him, len);
4980 }
4981
4982 int os::sendto(int fd, char* buf, size_t len, uint flags,
4983 struct sockaddr* to, socklen_t tolen) {
4984
4985 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4986 }
4987
4988 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4989 sockaddr* from, socklen_t* fromlen) {
4990
4991 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4992 }
4993
4994 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4995 return ::recv(fd, buf, (int)nBytes, flags);
4996 }
4997
4998 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4999 return ::send(fd, buf, (int)nBytes, flags);
5000 }
5001
5002 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5003 return ::send(fd, buf, (int)nBytes, flags);
5004 }
5005
5006 int os::timeout(int fd, long timeout) {
5007 fd_set tbl;
5008 struct timeval t;
5009
5010 t.tv_sec = timeout / 1000;
5011 t.tv_usec = (timeout % 1000) * 1000;
5012
5013 tbl.fd_count = 1;
5014 tbl.fd_array[0] = fd;
5015
5016 return ::select(1, &tbl, 0, 0, &t);
5017 }
5018
5019 int os::get_host_name(char* name, int namelen) {
5020 return ::gethostname(name, namelen);
5021 }
5022
5023 int os::socket_shutdown(int fd, int howto) {
5024 return ::shutdown(fd, howto);
5025 }
5026
5027 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5028 return ::bind(fd, him, len);
5029 }
5030
5031 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5032 return ::getsockname(fd, him, len);
5033 }
5034
5035 int os::get_sock_opt(int fd, int level, int optname,
5036 char* optval, socklen_t* optlen) {
5037 return ::getsockopt(fd, level, optname, optval, optlen);
5038 }
5039
5040 int os::set_sock_opt(int fd, int level, int optname,
5041 const char* optval, socklen_t optlen) {
5042 return ::setsockopt(fd, level, optname, optval, optlen);
5043 }
5044
5045
5046 // Kernel32 API
5047 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5048 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5049 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5050 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5051 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5052
5053 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5054 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5055 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5056 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5057 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5058
5059
5060 BOOL os::Kernel32Dll::initialized = FALSE;
5061 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5062 assert(initialized && _GetLargePageMinimum != NULL,
5063 "GetLargePageMinimumAvailable() not yet called");
5064 return _GetLargePageMinimum();
5065 }
5066
5067 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5068 if (!initialized) {
5069 initialize();
5070 }
5071 return _GetLargePageMinimum != NULL;
5072 }
5073
5074 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5075 if (!initialized) {
5076 initialize();
5077 }
5078 return _VirtualAllocExNuma != NULL;
5079 }
5080
5081 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5082 assert(initialized && _VirtualAllocExNuma != NULL,
5083 "NUMACallsAvailable() not yet called");
5084
5085 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5086 }
5087
5088 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5089 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5090 "NUMACallsAvailable() not yet called");
5091
5092 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5093 }
5094
5095 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5096 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5097 "NUMACallsAvailable() not yet called");
5098
5099 return _GetNumaNodeProcessorMask(node, proc_mask);
5100 }
5101
5102 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5103 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5104 if (!initialized) {
5105 initialize();
5106 }
5107
5108 if (_RtlCaptureStackBackTrace != NULL) {
5109 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5110 BackTrace, BackTraceHash);
5111 } else {
5112 return 0;
5113 }
5114 }
5115
5116 void os::Kernel32Dll::initializeCommon() {
5117 if (!initialized) {
5118 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5119 assert(handle != NULL, "Just check");
5120 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5121 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5122 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5123 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5124 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5125 initialized = TRUE;
5126 }
5127 }
5128
5129
5130
5131 #ifndef JDK6_OR_EARLIER
5132
5133 void os::Kernel32Dll::initialize() {
5134 initializeCommon();
5135 }
5136
5137
5138 // Kernel32 API
5139 inline BOOL os::Kernel32Dll::SwitchToThread() {
5140 return ::SwitchToThread();
5141 }
5142
5143 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5144 return true;
5145 }
5146
5147 // Help tools
5148 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5149 return true;
5150 }
5151
5152 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5153 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5154 }
5155
5156 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5157 return ::Module32First(hSnapshot, lpme);
5158 }
5159
5160 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5161 return ::Module32Next(hSnapshot, lpme);
5162 }
5163
5164
5165 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5166 return true;
5167 }
5168
5169 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5170 ::GetNativeSystemInfo(lpSystemInfo);
5171 }
5172
5173 // PSAPI API
5174 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5175 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5176 }
5177
5178 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5179 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5180 }
5181
5182 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5183 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5184 }
5185
5186 inline BOOL os::PSApiDll::PSApiAvailable() {
5187 return true;
5188 }
5189
5190
5191 // WinSock2 API
5192 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5193 return ::WSAStartup(wVersionRequested, lpWSAData);
5194 }
5195
5196 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5197 return ::gethostbyname(name);
5198 }
5199
5200 inline BOOL os::WinSock2Dll::WinSock2Available() {
5201 return true;
5202 }
5203
5204 // Advapi API
5205 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5206 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5207 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5208 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5209 BufferLength, PreviousState, ReturnLength);
5210 }
5211
5212 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5213 PHANDLE TokenHandle) {
5214 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5215 }
5216
5217 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5218 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5219 }
5220
5221 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5222 return true;
5223 }
5224
5225 #else
5226 // Kernel32 API
5227 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5228 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5229 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5230 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5231 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5232
5233 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5234 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5235 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5236 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5237 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5238
5239 void os::Kernel32Dll::initialize() {
5240 if (!initialized) {
5241 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5242 assert(handle != NULL, "Just check");
5243
5244 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5245 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5246 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5247 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5248 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5249 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5250 initializeCommon(); // resolve the functions that always need resolving
5251
5252 initialized = TRUE;
5253 }
5254 }
5255
5256 BOOL os::Kernel32Dll::SwitchToThread() {
5257 assert(initialized && _SwitchToThread != NULL,
5258 "SwitchToThreadAvailable() not yet called");
5259 return _SwitchToThread();
5260 }
5261
5262
5263 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5264 if (!initialized) {
5265 initialize();
5266 }
5267 return _SwitchToThread != NULL;
5268 }
5269
5270 // Help tools
5271 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5272 if (!initialized) {
5273 initialize();
5274 }
5275 return _CreateToolhelp32Snapshot != NULL &&
5276 _Module32First != NULL &&
5277 _Module32Next != NULL;
5278 }
5279
5280 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5281 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5282 "HelpToolsAvailable() not yet called");
5283
5284 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5285 }
5286
5287 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5288 assert(initialized && _Module32First != NULL,
5289 "HelpToolsAvailable() not yet called");
5290
5291 return _Module32First(hSnapshot, lpme);
5292 }
5293
5294 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5295 assert(initialized && _Module32Next != NULL,
5296 "HelpToolsAvailable() not yet called");
5297
5298 return _Module32Next(hSnapshot, lpme);
5299 }
5300
5301
5302 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5303 if (!initialized) {
5304 initialize();
5305 }
5306 return _GetNativeSystemInfo != NULL;
5307 }
5308
5309 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5310 assert(initialized && _GetNativeSystemInfo != NULL,
5311 "GetNativeSystemInfoAvailable() not yet called");
5312
5313 _GetNativeSystemInfo(lpSystemInfo);
5314 }
5315
5316 // PSAPI API
5317
5318
5319 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5320 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5321 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5322
5323 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5324 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5325 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5326 BOOL os::PSApiDll::initialized = FALSE;
5327
5328 void os::PSApiDll::initialize() {
5329 if (!initialized) {
5330 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5331 if (handle != NULL) {
5332 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5333 "EnumProcessModules");
5334 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5335 "GetModuleFileNameExA");
5336 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5337 "GetModuleInformation");
5338 }
5339 initialized = TRUE;
5340 }
5341 }
5342
5343
5344
5345 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5346 assert(initialized && _EnumProcessModules != NULL,
5347 "PSApiAvailable() not yet called");
5348 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5349 }
5350
5351 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5352 assert(initialized && _GetModuleFileNameEx != NULL,
5353 "PSApiAvailable() not yet called");
5354 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5355 }
5356
5357 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5358 assert(initialized && _GetModuleInformation != NULL,
5359 "PSApiAvailable() not yet called");
5360 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5361 }
5362
5363 BOOL os::PSApiDll::PSApiAvailable() {
5364 if (!initialized) {
5365 initialize();
5366 }
5367 return _EnumProcessModules != NULL &&
5368 _GetModuleFileNameEx != NULL &&
5369 _GetModuleInformation != NULL;
5370 }
5371
5372
5373 // WinSock2 API
5374 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5375 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5376
5377 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5378 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5379 BOOL os::WinSock2Dll::initialized = FALSE;
5380
5381 void os::WinSock2Dll::initialize() {
5382 if (!initialized) {
5383 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5384 if (handle != NULL) {
5385 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5386 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5387 }
5388 initialized = TRUE;
5389 }
5390 }
5391
5392
5393 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5394 assert(initialized && _WSAStartup != NULL,
5395 "WinSock2Available() not yet called");
5396 return _WSAStartup(wVersionRequested, lpWSAData);
5397 }
5398
5399 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5400 assert(initialized && _gethostbyname != NULL,
5401 "WinSock2Available() not yet called");
5402 return _gethostbyname(name);
5403 }
5404
5405 BOOL os::WinSock2Dll::WinSock2Available() {
5406 if (!initialized) {
5407 initialize();
5408 }
5409 return _WSAStartup != NULL &&
5410 _gethostbyname != NULL;
5411 }
5412
5413 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5414 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5415 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5416
5417 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5418 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5419 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5420 BOOL os::Advapi32Dll::initialized = FALSE;
5421
5422 void os::Advapi32Dll::initialize() {
5423 if (!initialized) {
5424 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5425 if (handle != NULL) {
5426 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5427 "AdjustTokenPrivileges");
5428 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5429 "OpenProcessToken");
5430 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5431 "LookupPrivilegeValueA");
5432 }
5433 initialized = TRUE;
5434 }
5435 }
5436
5437 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5438 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5439 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5440 assert(initialized && _AdjustTokenPrivileges != NULL,
5441 "AdvapiAvailable() not yet called");
5442 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5443 BufferLength, PreviousState, ReturnLength);
5444 }
5445
5446 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5447 PHANDLE TokenHandle) {
5448 assert(initialized && _OpenProcessToken != NULL,
5449 "AdvapiAvailable() not yet called");
5450 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5451 }
5452
5453 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5454 assert(initialized && _LookupPrivilegeValue != NULL,
5455 "AdvapiAvailable() not yet called");
5456 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5457 }
5458
5459 BOOL os::Advapi32Dll::AdvapiAvailable() {
5460 if (!initialized) {
5461 initialize();
5462 }
5463 return _AdjustTokenPrivileges != NULL &&
5464 _OpenProcessToken != NULL &&
5465 _LookupPrivilegeValue != NULL;
5466 }
5467
5468 #endif