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 bool os::supports_vtime() { return true; }
817 bool os::enable_vtime() { return false; }
818 bool os::vtime_enabled() { return false; }
819
820 double os::elapsedVTime() {
821 FILETIME created;
822 FILETIME exited;
823 FILETIME kernel;
824 FILETIME user;
825 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
826 // the resolution of windows_to_java_time() should be sufficient (ms)
827 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
828 } else {
829 return elapsedTime();
830 }
831 }
832
833 jlong os::javaTimeMillis() {
834 if (UseFakeTimers) {
835 return fake_time++;
836 } else {
837 FILETIME wt;
838 GetSystemTimeAsFileTime(&wt);
839 return windows_to_java_time(wt);
840 }
841 }
842
843 jlong os::javaTimeNanos() {
844 if (!has_performance_count) {
845 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
846 } else {
847 LARGE_INTEGER current_count;
848 QueryPerformanceCounter(¤t_count);
849 double current = as_long(current_count);
850 double freq = performance_frequency;
851 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
852 return time;
853 }
854 }
855
856 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
857 if (!has_performance_count) {
858 // javaTimeMillis() doesn't have much percision,
859 // but it is not going to wrap -- so all 64 bits
860 info_ptr->max_value = ALL_64_BITS;
861
862 // this is a wall clock timer, so may skip
863 info_ptr->may_skip_backward = true;
864 info_ptr->may_skip_forward = true;
865 } else {
866 jlong freq = performance_frequency;
867 if (freq < NANOSECS_PER_SEC) {
868 // the performance counter is 64 bits and we will
869 // be multiplying it -- so no wrap in 64 bits
870 info_ptr->max_value = ALL_64_BITS;
871 } else if (freq > NANOSECS_PER_SEC) {
872 // use the max value the counter can reach to
873 // determine the max value which could be returned
874 julong max_counter = (julong)ALL_64_BITS;
875 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
876 } else {
877 // the performance counter is 64 bits and we will
878 // be using it directly -- so no wrap in 64 bits
879 info_ptr->max_value = ALL_64_BITS;
880 }
881
882 // using a counter, so no skipping
883 info_ptr->may_skip_backward = false;
884 info_ptr->may_skip_forward = false;
885 }
886 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
887 }
888
889 char* os::local_time_string(char *buf, size_t buflen) {
890 SYSTEMTIME st;
891 GetLocalTime(&st);
892 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
893 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
894 return buf;
895 }
896
897 bool os::getTimesSecs(double* process_real_time,
898 double* process_user_time,
899 double* process_system_time) {
900 HANDLE h_process = GetCurrentProcess();
901 FILETIME create_time, exit_time, kernel_time, user_time;
902 BOOL result = GetProcessTimes(h_process,
903 &create_time,
904 &exit_time,
905 &kernel_time,
906 &user_time);
907 if (result != 0) {
908 FILETIME wt;
909 GetSystemTimeAsFileTime(&wt);
910 jlong rtc_millis = windows_to_java_time(wt);
911 jlong user_millis = windows_to_java_time(user_time);
912 jlong system_millis = windows_to_java_time(kernel_time);
913 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
914 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
915 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
916 return true;
917 } else {
918 return false;
919 }
920 }
921
922 void os::shutdown() {
923
924 // allow PerfMemory to attempt cleanup of any persistent resources
925 perfMemory_exit();
926
927 // flush buffered output, finish log files
928 ostream_abort();
929
930 // Check for abort hook
931 abort_hook_t abort_hook = Arguments::abort_hook();
932 if (abort_hook != NULL) {
933 abort_hook();
934 }
935 }
936
937
938 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
939 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
940
941 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
942 HINSTANCE dbghelp;
943 EXCEPTION_POINTERS ep;
944 MINIDUMP_EXCEPTION_INFORMATION mei;
945 MINIDUMP_EXCEPTION_INFORMATION* pmei;
946
947 HANDLE hProcess = GetCurrentProcess();
948 DWORD processId = GetCurrentProcessId();
949 HANDLE dumpFile;
950 MINIDUMP_TYPE dumpType;
951 static const char* cwd;
952
953 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
954 #ifndef ASSERT
955 // If running on a client version of Windows and user has not explicitly enabled dumping
956 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
957 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
958 return;
959 // If running on a server version of Windows and user has explictly disabled dumping
960 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
961 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
962 return;
963 }
964 #else
965 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
966 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
967 return;
968 }
969 #endif
970
971 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
972
973 if (dbghelp == NULL) {
974 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
975 return;
976 }
977
978 _MiniDumpWriteDump = CAST_TO_FN_PTR(
979 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
980 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
981 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
982
983 if (_MiniDumpWriteDump == NULL) {
984 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
985 return;
986 }
987
988 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
989
990 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
991 // API_VERSION_NUMBER 11 or higher contains the ones we want though
992 #if API_VERSION_NUMBER >= 11
993 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
994 MiniDumpWithUnloadedModules);
995 #endif
996
997 cwd = get_current_directory(NULL, 0);
998 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
999 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1000
1001 if (dumpFile == INVALID_HANDLE_VALUE) {
1002 VMError::report_coredump_status("Failed to create file for dumping", false);
1003 return;
1004 }
1005 if (exceptionRecord != NULL && contextRecord != NULL) {
1006 ep.ContextRecord = (PCONTEXT) contextRecord;
1007 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1008
1009 mei.ThreadId = GetCurrentThreadId();
1010 mei.ExceptionPointers = &ep;
1011 pmei = &mei;
1012 } else {
1013 pmei = NULL;
1014 }
1015
1016
1017 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1018 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1019 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1020 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1021 DWORD error = GetLastError();
1022 LPTSTR msgbuf = NULL;
1023
1024 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1025 FORMAT_MESSAGE_FROM_SYSTEM |
1026 FORMAT_MESSAGE_IGNORE_INSERTS,
1027 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1028
1029 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1030 LocalFree(msgbuf);
1031 } else {
1032 // Call to FormatMessage failed, just include the result from GetLastError
1033 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1034 }
1035 VMError::report_coredump_status(buffer, false);
1036 } else {
1037 VMError::report_coredump_status(buffer, true);
1038 }
1039
1040 CloseHandle(dumpFile);
1041 }
1042
1043
1044
1045 void os::abort(bool dump_core)
1046 {
1047 os::shutdown();
1048 // no core dump on Windows
1049 ::exit(1);
1050 }
1051
1052 // Die immediately, no exit hook, no abort hook, no cleanup.
1053 void os::die() {
1054 _exit(-1);
1055 }
1056
1057 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1058 // * dirent_md.c 1.15 00/02/02
1059 //
1060 // The declarations for DIR and struct dirent are in jvm_win32.h.
1061
1062 /* Caller must have already run dirname through JVM_NativePath, which removes
1063 duplicate slashes and converts all instances of '/' into '\\'. */
1064
1065 DIR *
1066 os::opendir(const char *dirname)
1067 {
1068 assert(dirname != NULL, "just checking"); // hotspot change
1069 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1070 DWORD fattr; // hotspot change
1071 char alt_dirname[4] = { 0, 0, 0, 0 };
1072
1073 if (dirp == 0) {
1074 errno = ENOMEM;
1075 return 0;
1076 }
1077
1078 /*
1079 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1080 * as a directory in FindFirstFile(). We detect this case here and
1081 * prepend the current drive name.
1082 */
1083 if (dirname[1] == '\0' && dirname[0] == '\\') {
1084 alt_dirname[0] = _getdrive() + 'A' - 1;
1085 alt_dirname[1] = ':';
1086 alt_dirname[2] = '\\';
1087 alt_dirname[3] = '\0';
1088 dirname = alt_dirname;
1089 }
1090
1091 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1092 if (dirp->path == 0) {
1093 free(dirp, mtInternal);
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097 strcpy(dirp->path, dirname);
1098
1099 fattr = GetFileAttributes(dirp->path);
1100 if (fattr == 0xffffffff) {
1101 free(dirp->path, mtInternal);
1102 free(dirp, mtInternal);
1103 errno = ENOENT;
1104 return 0;
1105 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1106 free(dirp->path, mtInternal);
1107 free(dirp, mtInternal);
1108 errno = ENOTDIR;
1109 return 0;
1110 }
1111
1112 /* Append "*.*", or possibly "\\*.*", to path */
1113 if (dirp->path[1] == ':'
1114 && (dirp->path[2] == '\0'
1115 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1116 /* No '\\' needed for cases like "Z:" or "Z:\" */
1117 strcat(dirp->path, "*.*");
1118 } else {
1119 strcat(dirp->path, "\\*.*");
1120 }
1121
1122 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1123 if (dirp->handle == INVALID_HANDLE_VALUE) {
1124 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1125 free(dirp->path, mtInternal);
1126 free(dirp, mtInternal);
1127 errno = EACCES;
1128 return 0;
1129 }
1130 }
1131 return dirp;
1132 }
1133
1134 /* parameter dbuf unused on Windows */
1135
1136 struct dirent *
1137 os::readdir(DIR *dirp, dirent *dbuf)
1138 {
1139 assert(dirp != NULL, "just checking"); // hotspot change
1140 if (dirp->handle == INVALID_HANDLE_VALUE) {
1141 return 0;
1142 }
1143
1144 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1145
1146 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1147 if (GetLastError() == ERROR_INVALID_HANDLE) {
1148 errno = EBADF;
1149 return 0;
1150 }
1151 FindClose(dirp->handle);
1152 dirp->handle = INVALID_HANDLE_VALUE;
1153 }
1154
1155 return &dirp->dirent;
1156 }
1157
1158 int
1159 os::closedir(DIR *dirp)
1160 {
1161 assert(dirp != NULL, "just checking"); // hotspot change
1162 if (dirp->handle != INVALID_HANDLE_VALUE) {
1163 if (!FindClose(dirp->handle)) {
1164 errno = EBADF;
1165 return -1;
1166 }
1167 dirp->handle = INVALID_HANDLE_VALUE;
1168 }
1169 free(dirp->path, mtInternal);
1170 free(dirp, mtInternal);
1171 return 0;
1172 }
1173
1174 // This must be hard coded because it's the system's temporary
1175 // directory not the java application's temp directory, ala java.io.tmpdir.
1176 const char* os::get_temp_directory() {
1177 static char path_buf[MAX_PATH];
1178 if (GetTempPath(MAX_PATH, path_buf)>0)
1179 return path_buf;
1180 else{
1181 path_buf[0]='\0';
1182 return path_buf;
1183 }
1184 }
1185
1186 static bool file_exists(const char* filename) {
1187 if (filename == NULL || strlen(filename) == 0) {
1188 return false;
1189 }
1190 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1191 }
1192
1193 bool os::dll_build_name(char *buffer, size_t buflen,
1194 const char* pname, const char* fname) {
1195 bool retval = false;
1196 const size_t pnamelen = pname ? strlen(pname) : 0;
1197 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1198
1199 // Return error on buffer overflow.
1200 if (pnamelen + strlen(fname) + 10 > buflen) {
1201 return retval;
1202 }
1203
1204 if (pnamelen == 0) {
1205 jio_snprintf(buffer, buflen, "%s.dll", fname);
1206 retval = true;
1207 } else if (c == ':' || c == '\\') {
1208 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1209 retval = true;
1210 } else if (strchr(pname, *os::path_separator()) != NULL) {
1211 int n;
1212 char** pelements = split_path(pname, &n);
1213 if (pelements == NULL) {
1214 return false;
1215 }
1216 for (int i = 0 ; i < n ; i++) {
1217 char* path = pelements[i];
1218 // Really shouldn't be NULL, but check can't hurt
1219 size_t plen = (path == NULL) ? 0 : strlen(path);
1220 if (plen == 0) {
1221 continue; // skip the empty path values
1222 }
1223 const char lastchar = path[plen - 1];
1224 if (lastchar == ':' || lastchar == '\\') {
1225 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1226 } else {
1227 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1228 }
1229 if (file_exists(buffer)) {
1230 retval = true;
1231 break;
1232 }
1233 }
1234 // release the storage
1235 for (int i = 0 ; i < n ; i++) {
1236 if (pelements[i] != NULL) {
1237 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1238 }
1239 }
1240 if (pelements != NULL) {
1241 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1242 }
1243 } else {
1244 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1245 retval = true;
1246 }
1247 return retval;
1248 }
1249
1250 // Needs to be in os specific directory because windows requires another
1251 // header file <direct.h>
1252 const char* os::get_current_directory(char *buf, size_t buflen) {
1253 int n = static_cast<int>(buflen);
1254 if (buflen > INT_MAX) n = INT_MAX;
1255 return _getcwd(buf, n);
1256 }
1257
1258 //-----------------------------------------------------------
1259 // Helper functions for fatal error handler
1260 #ifdef _WIN64
1261 // Helper routine which returns true if address in
1262 // within the NTDLL address space.
1263 //
1264 static bool _addr_in_ntdll( address addr )
1265 {
1266 HMODULE hmod;
1267 MODULEINFO minfo;
1268
1269 hmod = GetModuleHandle("NTDLL.DLL");
1270 if ( hmod == NULL ) return false;
1271 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1272 &minfo, sizeof(MODULEINFO)) )
1273 return false;
1274
1275 if ( (addr >= minfo.lpBaseOfDll) &&
1276 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1277 return true;
1278 else
1279 return false;
1280 }
1281 #endif
1282
1283
1284 // Enumerate all modules for a given process ID
1285 //
1286 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1287 // different API for doing this. We use PSAPI.DLL on NT based
1288 // Windows and ToolHelp on 95/98/Me.
1289
1290 // Callback function that is called by enumerate_modules() on
1291 // every DLL module.
1292 // Input parameters:
1293 // int pid,
1294 // char* module_file_name,
1295 // address module_base_addr,
1296 // unsigned module_size,
1297 // void* param
1298 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1299
1300 // enumerate_modules for Windows NT, using PSAPI
1301 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1302 {
1303 HANDLE hProcess ;
1304
1305 # define MAX_NUM_MODULES 128
1306 HMODULE modules[MAX_NUM_MODULES];
1307 static char filename[ MAX_PATH ];
1308 int result = 0;
1309
1310 if (!os::PSApiDll::PSApiAvailable()) {
1311 return 0;
1312 }
1313
1314 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1315 FALSE, pid ) ;
1316 if (hProcess == NULL) return 0;
1317
1318 DWORD size_needed;
1319 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1320 sizeof(modules), &size_needed)) {
1321 CloseHandle( hProcess );
1322 return 0;
1323 }
1324
1325 // number of modules that are currently loaded
1326 int num_modules = size_needed / sizeof(HMODULE);
1327
1328 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1329 // Get Full pathname:
1330 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1331 filename, sizeof(filename))) {
1332 filename[0] = '\0';
1333 }
1334
1335 MODULEINFO modinfo;
1336 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1337 &modinfo, sizeof(modinfo))) {
1338 modinfo.lpBaseOfDll = NULL;
1339 modinfo.SizeOfImage = 0;
1340 }
1341
1342 // Invoke callback function
1343 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1344 modinfo.SizeOfImage, param);
1345 if (result) break;
1346 }
1347
1348 CloseHandle( hProcess ) ;
1349 return result;
1350 }
1351
1352
1353 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1354 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1355 {
1356 HANDLE hSnapShot ;
1357 static MODULEENTRY32 modentry ;
1358 int result = 0;
1359
1360 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1361 return 0;
1362 }
1363
1364 // Get a handle to a Toolhelp snapshot of the system
1365 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1366 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1367 return FALSE ;
1368 }
1369
1370 // iterate through all modules
1371 modentry.dwSize = sizeof(MODULEENTRY32) ;
1372 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1373
1374 while( not_done ) {
1375 // invoke the callback
1376 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1377 modentry.modBaseSize, param);
1378 if (result) break;
1379
1380 modentry.dwSize = sizeof(MODULEENTRY32) ;
1381 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1382 }
1383
1384 CloseHandle(hSnapShot);
1385 return result;
1386 }
1387
1388 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1389 {
1390 // Get current process ID if caller doesn't provide it.
1391 if (!pid) pid = os::current_process_id();
1392
1393 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1394 else return _enumerate_modules_windows(pid, func, param);
1395 }
1396
1397 struct _modinfo {
1398 address addr;
1399 char* full_path; // point to a char buffer
1400 int buflen; // size of the buffer
1401 address base_addr;
1402 };
1403
1404 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1405 unsigned size, void * param) {
1406 struct _modinfo *pmod = (struct _modinfo *)param;
1407 if (!pmod) return -1;
1408
1409 if (base_addr <= pmod->addr &&
1410 base_addr+size > pmod->addr) {
1411 // if a buffer is provided, copy path name to the buffer
1412 if (pmod->full_path) {
1413 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1414 }
1415 pmod->base_addr = base_addr;
1416 return 1;
1417 }
1418 return 0;
1419 }
1420
1421 bool os::dll_address_to_library_name(address addr, char* buf,
1422 int buflen, int* offset) {
1423 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1424 // return the full path to the DLL file, sometimes it returns path
1425 // to the corresponding PDB file (debug info); sometimes it only
1426 // returns partial path, which makes life painful.
1427
1428 struct _modinfo mi;
1429 mi.addr = addr;
1430 mi.full_path = buf;
1431 mi.buflen = buflen;
1432 int pid = os::current_process_id();
1433 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1434 // buf already contains path name
1435 if (offset) *offset = addr - mi.base_addr;
1436 return true;
1437 } else {
1438 if (buf) buf[0] = '\0';
1439 if (offset) *offset = -1;
1440 return false;
1441 }
1442 }
1443
1444 bool os::dll_address_to_function_name(address addr, char *buf,
1445 int buflen, int *offset) {
1446 if (Decoder::decode(addr, buf, buflen, offset)) {
1447 return true;
1448 }
1449 if (offset != NULL) *offset = -1;
1450 if (buf != NULL) buf[0] = '\0';
1451 return false;
1452 }
1453
1454 // save the start and end address of jvm.dll into param[0] and param[1]
1455 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1456 unsigned size, void * param) {
1457 if (!param) return -1;
1458
1459 if (base_addr <= (address)_locate_jvm_dll &&
1460 base_addr+size > (address)_locate_jvm_dll) {
1461 ((address*)param)[0] = base_addr;
1462 ((address*)param)[1] = base_addr + size;
1463 return 1;
1464 }
1465 return 0;
1466 }
1467
1468 address vm_lib_location[2]; // start and end address of jvm.dll
1469
1470 // check if addr is inside jvm.dll
1471 bool os::address_is_in_vm(address addr) {
1472 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1473 int pid = os::current_process_id();
1474 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1475 assert(false, "Can't find jvm module.");
1476 return false;
1477 }
1478 }
1479
1480 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1481 }
1482
1483 // print module info; param is outputStream*
1484 static int _print_module(int pid, char* fname, address base,
1485 unsigned size, void* param) {
1486 if (!param) return -1;
1487
1488 outputStream* st = (outputStream*)param;
1489
1490 address end_addr = base + size;
1491 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1492 return 0;
1493 }
1494
1495 // Loads .dll/.so and
1496 // in case of error it checks if .dll/.so was built for the
1497 // same architecture as Hotspot is running on
1498 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1499 {
1500 void * result = LoadLibrary(name);
1501 if (result != NULL)
1502 {
1503 return result;
1504 }
1505
1506 DWORD errcode = GetLastError();
1507 if (errcode == ERROR_MOD_NOT_FOUND) {
1508 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1509 ebuf[ebuflen-1]='\0';
1510 return NULL;
1511 }
1512
1513 // Parsing dll below
1514 // If we can read dll-info and find that dll was built
1515 // for an architecture other than Hotspot is running in
1516 // - then print to buffer "DLL was built for a different architecture"
1517 // else call os::lasterror to obtain system error message
1518
1519 // Read system error message into ebuf
1520 // It may or may not be overwritten below (in the for loop and just above)
1521 lasterror(ebuf, (size_t) ebuflen);
1522 ebuf[ebuflen-1]='\0';
1523 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1524 if (file_descriptor<0)
1525 {
1526 return NULL;
1527 }
1528
1529 uint32_t signature_offset;
1530 uint16_t lib_arch=0;
1531 bool failed_to_get_lib_arch=
1532 (
1533 //Go to position 3c in the dll
1534 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1535 ||
1536 // Read loacation of signature
1537 (sizeof(signature_offset)!=
1538 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1539 ||
1540 //Go to COFF File Header in dll
1541 //that is located after"signature" (4 bytes long)
1542 (os::seek_to_file_offset(file_descriptor,
1543 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1544 ||
1545 //Read field that contains code of architecture
1546 // that dll was build for
1547 (sizeof(lib_arch)!=
1548 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1549 );
1550
1551 ::close(file_descriptor);
1552 if (failed_to_get_lib_arch)
1553 {
1554 // file i/o error - report os::lasterror(...) msg
1555 return NULL;
1556 }
1557
1558 typedef struct
1559 {
1560 uint16_t arch_code;
1561 char* arch_name;
1562 } arch_t;
1563
1564 static const arch_t arch_array[]={
1565 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1566 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1567 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1568 };
1569 #if (defined _M_IA64)
1570 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1571 #elif (defined _M_AMD64)
1572 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1573 #elif (defined _M_IX86)
1574 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1575 #else
1576 #error Method os::dll_load requires that one of following \
1577 is defined :_M_IA64,_M_AMD64 or _M_IX86
1578 #endif
1579
1580
1581 // Obtain a string for printf operation
1582 // lib_arch_str shall contain string what platform this .dll was built for
1583 // running_arch_str shall string contain what platform Hotspot was built for
1584 char *running_arch_str=NULL,*lib_arch_str=NULL;
1585 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1586 {
1587 if (lib_arch==arch_array[i].arch_code)
1588 lib_arch_str=arch_array[i].arch_name;
1589 if (running_arch==arch_array[i].arch_code)
1590 running_arch_str=arch_array[i].arch_name;
1591 }
1592
1593 assert(running_arch_str,
1594 "Didn't find runing architecture code in arch_array");
1595
1596 // If the architure is right
1597 // but some other error took place - report os::lasterror(...) msg
1598 if (lib_arch == running_arch)
1599 {
1600 return NULL;
1601 }
1602
1603 if (lib_arch_str!=NULL)
1604 {
1605 ::_snprintf(ebuf, ebuflen-1,
1606 "Can't load %s-bit .dll on a %s-bit platform",
1607 lib_arch_str,running_arch_str);
1608 }
1609 else
1610 {
1611 // don't know what architecture this dll was build for
1612 ::_snprintf(ebuf, ebuflen-1,
1613 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1614 lib_arch,running_arch_str);
1615 }
1616
1617 return NULL;
1618 }
1619
1620
1621 void os::print_dll_info(outputStream *st) {
1622 int pid = os::current_process_id();
1623 st->print_cr("Dynamic libraries:");
1624 enumerate_modules(pid, _print_module, (void *)st);
1625 }
1626
1627 void os::print_os_info_brief(outputStream* st) {
1628 os::print_os_info(st);
1629 }
1630
1631 void os::print_os_info(outputStream* st) {
1632 st->print("OS:");
1633
1634 os::win32::print_windows_version(st);
1635 }
1636
1637 void os::win32::print_windows_version(outputStream* st) {
1638 OSVERSIONINFOEX osvi;
1639 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1640 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1641
1642 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1643 st->print_cr("N/A");
1644 return;
1645 }
1646
1647 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1648 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1649 switch (os_vers) {
1650 case 3051: st->print(" Windows NT 3.51"); break;
1651 case 4000: st->print(" Windows NT 4.0"); break;
1652 case 5000: st->print(" Windows 2000"); break;
1653 case 5001: st->print(" Windows XP"); break;
1654 case 5002:
1655 case 6000:
1656 case 6001:
1657 case 6002: {
1658 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1659 // find out whether we are running on 64 bit processor or not.
1660 SYSTEM_INFO si;
1661 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1662 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1663 GetSystemInfo(&si);
1664 } else {
1665 os::Kernel32Dll::GetNativeSystemInfo(&si);
1666 }
1667 if (os_vers == 5002) {
1668 if (osvi.wProductType == VER_NT_WORKSTATION &&
1669 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1670 st->print(" Windows XP x64 Edition");
1671 else
1672 st->print(" Windows Server 2003 family");
1673 } else if (os_vers == 6000) {
1674 if (osvi.wProductType == VER_NT_WORKSTATION)
1675 st->print(" Windows Vista");
1676 else
1677 st->print(" Windows Server 2008");
1678 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1679 st->print(" , 64 bit");
1680 } else if (os_vers == 6001) {
1681 if (osvi.wProductType == VER_NT_WORKSTATION) {
1682 st->print(" Windows 7");
1683 } else {
1684 // Unrecognized windows, print out its major and minor versions
1685 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1686 }
1687 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1688 st->print(" , 64 bit");
1689 } else if (os_vers == 6002) {
1690 if (osvi.wProductType == VER_NT_WORKSTATION) {
1691 st->print(" Windows 8");
1692 } else {
1693 st->print(" Windows Server 2012");
1694 }
1695 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1696 st->print(" , 64 bit");
1697 } else { // future os
1698 // Unrecognized windows, print out its major and minor versions
1699 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1700 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1701 st->print(" , 64 bit");
1702 }
1703 break;
1704 }
1705 default: // future windows, print out its major and minor versions
1706 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1707 }
1708 } else {
1709 switch (os_vers) {
1710 case 4000: st->print(" Windows 95"); break;
1711 case 4010: st->print(" Windows 98"); break;
1712 case 4090: st->print(" Windows Me"); break;
1713 default: // future windows, print out its major and minor versions
1714 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1715 }
1716 }
1717 st->print(" Build %d", osvi.dwBuildNumber);
1718 st->print(" %s", osvi.szCSDVersion); // service pack
1719 st->cr();
1720 }
1721
1722 void os::pd_print_cpu_info(outputStream* st) {
1723 // Nothing to do for now.
1724 }
1725
1726 void os::print_memory_info(outputStream* st) {
1727 st->print("Memory:");
1728 st->print(" %dk page", os::vm_page_size()>>10);
1729
1730 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1731 // value if total memory is larger than 4GB
1732 MEMORYSTATUSEX ms;
1733 ms.dwLength = sizeof(ms);
1734 GlobalMemoryStatusEx(&ms);
1735
1736 st->print(", physical %uk", os::physical_memory() >> 10);
1737 st->print("(%uk free)", os::available_memory() >> 10);
1738
1739 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1740 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1741 st->cr();
1742 }
1743
1744 void os::print_siginfo(outputStream *st, void *siginfo) {
1745 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1746 st->print("siginfo:");
1747 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1748
1749 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1750 er->NumberParameters >= 2) {
1751 switch (er->ExceptionInformation[0]) {
1752 case 0: st->print(", reading address"); break;
1753 case 1: st->print(", writing address"); break;
1754 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1755 er->ExceptionInformation[0]);
1756 }
1757 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1758 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1759 er->NumberParameters >= 2 && UseSharedSpaces) {
1760 FileMapInfo* mapinfo = FileMapInfo::current_info();
1761 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1762 st->print("\n\nError accessing class data sharing archive." \
1763 " Mapped file inaccessible during execution, " \
1764 " possible disk/network problem.");
1765 }
1766 } else {
1767 int num = er->NumberParameters;
1768 if (num > 0) {
1769 st->print(", ExceptionInformation=");
1770 for (int i = 0; i < num; i++) {
1771 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1772 }
1773 }
1774 }
1775 st->cr();
1776 }
1777
1778 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1779 // do nothing
1780 }
1781
1782 static char saved_jvm_path[MAX_PATH] = {0};
1783
1784 // Find the full path to the current module, jvm.dll
1785 void os::jvm_path(char *buf, jint buflen) {
1786 // Error checking.
1787 if (buflen < MAX_PATH) {
1788 assert(false, "must use a large-enough buffer");
1789 buf[0] = '\0';
1790 return;
1791 }
1792 // Lazy resolve the path to current module.
1793 if (saved_jvm_path[0] != 0) {
1794 strcpy(buf, saved_jvm_path);
1795 return;
1796 }
1797
1798 buf[0] = '\0';
1799 if (Arguments::created_by_gamma_launcher()) {
1800 // Support for the gamma launcher. Check for an
1801 // JAVA_HOME environment variable
1802 // and fix up the path so it looks like
1803 // libjvm.so is installed there (append a fake suffix
1804 // hotspot/libjvm.so).
1805 char* java_home_var = ::getenv("JAVA_HOME");
1806 if (java_home_var != NULL && java_home_var[0] != 0) {
1807
1808 strncpy(buf, java_home_var, buflen);
1809
1810 // determine if this is a legacy image or modules image
1811 // modules image doesn't have "jre" subdirectory
1812 size_t len = strlen(buf);
1813 char* jrebin_p = buf + len;
1814 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1815 if (0 != _access(buf, 0)) {
1816 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1817 }
1818 len = strlen(buf);
1819 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1820 }
1821 }
1822
1823 if(buf[0] == '\0') {
1824 GetModuleFileName(vm_lib_handle, buf, buflen);
1825 }
1826 strcpy(saved_jvm_path, buf);
1827 }
1828
1829
1830 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1831 #ifndef _WIN64
1832 st->print("_");
1833 #endif
1834 }
1835
1836
1837 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1838 #ifndef _WIN64
1839 st->print("@%d", args_size * sizeof(int));
1840 #endif
1841 }
1842
1843 // This method is a copy of JDK's sysGetLastErrorString
1844 // from src/windows/hpi/src/system_md.c
1845
1846 size_t os::lasterror(char* buf, size_t len) {
1847 DWORD errval;
1848
1849 if ((errval = GetLastError()) != 0) {
1850 // DOS error
1851 size_t n = (size_t)FormatMessage(
1852 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1853 NULL,
1854 errval,
1855 0,
1856 buf,
1857 (DWORD)len,
1858 NULL);
1859 if (n > 3) {
1860 // Drop final '.', CR, LF
1861 if (buf[n - 1] == '\n') n--;
1862 if (buf[n - 1] == '\r') n--;
1863 if (buf[n - 1] == '.') n--;
1864 buf[n] = '\0';
1865 }
1866 return n;
1867 }
1868
1869 if (errno != 0) {
1870 // C runtime error that has no corresponding DOS error code
1871 const char* s = strerror(errno);
1872 size_t n = strlen(s);
1873 if (n >= len) n = len - 1;
1874 strncpy(buf, s, n);
1875 buf[n] = '\0';
1876 return n;
1877 }
1878
1879 return 0;
1880 }
1881
1882 int os::get_last_error() {
1883 DWORD error = GetLastError();
1884 if (error == 0)
1885 error = errno;
1886 return (int)error;
1887 }
1888
1889 // sun.misc.Signal
1890 // NOTE that this is a workaround for an apparent kernel bug where if
1891 // a signal handler for SIGBREAK is installed then that signal handler
1892 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1893 // See bug 4416763.
1894 static void (*sigbreakHandler)(int) = NULL;
1895
1896 static void UserHandler(int sig, void *siginfo, void *context) {
1897 os::signal_notify(sig);
1898 // We need to reinstate the signal handler each time...
1899 os::signal(sig, (void*)UserHandler);
1900 }
1901
1902 void* os::user_handler() {
1903 return (void*) UserHandler;
1904 }
1905
1906 void* os::signal(int signal_number, void* handler) {
1907 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1908 void (*oldHandler)(int) = sigbreakHandler;
1909 sigbreakHandler = (void (*)(int)) handler;
1910 return (void*) oldHandler;
1911 } else {
1912 return (void*)::signal(signal_number, (void (*)(int))handler);
1913 }
1914 }
1915
1916 void os::signal_raise(int signal_number) {
1917 raise(signal_number);
1918 }
1919
1920 // The Win32 C runtime library maps all console control events other than ^C
1921 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1922 // logoff, and shutdown events. We therefore install our own console handler
1923 // that raises SIGTERM for the latter cases.
1924 //
1925 static BOOL WINAPI consoleHandler(DWORD event) {
1926 switch(event) {
1927 case CTRL_C_EVENT:
1928 if (is_error_reported()) {
1929 // Ctrl-C is pressed during error reporting, likely because the error
1930 // handler fails to abort. Let VM die immediately.
1931 os::die();
1932 }
1933
1934 os::signal_raise(SIGINT);
1935 return TRUE;
1936 break;
1937 case CTRL_BREAK_EVENT:
1938 if (sigbreakHandler != NULL) {
1939 (*sigbreakHandler)(SIGBREAK);
1940 }
1941 return TRUE;
1942 break;
1943 case CTRL_LOGOFF_EVENT: {
1944 // Don't terminate JVM if it is running in a non-interactive session,
1945 // such as a service process.
1946 USEROBJECTFLAGS flags;
1947 HANDLE handle = GetProcessWindowStation();
1948 if (handle != NULL &&
1949 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1950 sizeof( USEROBJECTFLAGS), NULL)) {
1951 // If it is a non-interactive session, let next handler to deal
1952 // with it.
1953 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1954 return FALSE;
1955 }
1956 }
1957 }
1958 case CTRL_CLOSE_EVENT:
1959 case CTRL_SHUTDOWN_EVENT:
1960 os::signal_raise(SIGTERM);
1961 return TRUE;
1962 break;
1963 default:
1964 break;
1965 }
1966 return FALSE;
1967 }
1968
1969 /*
1970 * The following code is moved from os.cpp for making this
1971 * code platform specific, which it is by its very nature.
1972 */
1973
1974 // Return maximum OS signal used + 1 for internal use only
1975 // Used as exit signal for signal_thread
1976 int os::sigexitnum_pd(){
1977 return NSIG;
1978 }
1979
1980 // a counter for each possible signal value, including signal_thread exit signal
1981 static volatile jint pending_signals[NSIG+1] = { 0 };
1982 static HANDLE sig_sem = NULL;
1983
1984 void os::signal_init_pd() {
1985 // Initialize signal structures
1986 memset((void*)pending_signals, 0, sizeof(pending_signals));
1987
1988 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1989
1990 // Programs embedding the VM do not want it to attempt to receive
1991 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1992 // shutdown hooks mechanism introduced in 1.3. For example, when
1993 // the VM is run as part of a Windows NT service (i.e., a servlet
1994 // engine in a web server), the correct behavior is for any console
1995 // control handler to return FALSE, not TRUE, because the OS's
1996 // "final" handler for such events allows the process to continue if
1997 // it is a service (while terminating it if it is not a service).
1998 // To make this behavior uniform and the mechanism simpler, we
1999 // completely disable the VM's usage of these console events if -Xrs
2000 // (=ReduceSignalUsage) is specified. This means, for example, that
2001 // the CTRL-BREAK thread dump mechanism is also disabled in this
2002 // case. See bugs 4323062, 4345157, and related bugs.
2003
2004 if (!ReduceSignalUsage) {
2005 // Add a CTRL-C handler
2006 SetConsoleCtrlHandler(consoleHandler, TRUE);
2007 }
2008 }
2009
2010 void os::signal_notify(int signal_number) {
2011 BOOL ret;
2012 if (sig_sem != NULL) {
2013 Atomic::inc(&pending_signals[signal_number]);
2014 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2015 assert(ret != 0, "ReleaseSemaphore() failed");
2016 }
2017 }
2018
2019 static int check_pending_signals(bool wait_for_signal) {
2020 DWORD ret;
2021 while (true) {
2022 for (int i = 0; i < NSIG + 1; i++) {
2023 jint n = pending_signals[i];
2024 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2025 return i;
2026 }
2027 }
2028 if (!wait_for_signal) {
2029 return -1;
2030 }
2031
2032 JavaThread *thread = JavaThread::current();
2033
2034 ThreadBlockInVM tbivm(thread);
2035
2036 bool threadIsSuspended;
2037 do {
2038 thread->set_suspend_equivalent();
2039 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2040 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2041 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2042
2043 // were we externally suspended while we were waiting?
2044 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2045 if (threadIsSuspended) {
2046 //
2047 // The semaphore has been incremented, but while we were waiting
2048 // another thread suspended us. We don't want to continue running
2049 // while suspended because that would surprise the thread that
2050 // suspended us.
2051 //
2052 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2053 assert(ret != 0, "ReleaseSemaphore() failed");
2054
2055 thread->java_suspend_self();
2056 }
2057 } while (threadIsSuspended);
2058 }
2059 }
2060
2061 int os::signal_lookup() {
2062 return check_pending_signals(false);
2063 }
2064
2065 int os::signal_wait() {
2066 return check_pending_signals(true);
2067 }
2068
2069 // Implicit OS exception handling
2070
2071 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2072 JavaThread* thread = JavaThread::current();
2073 // Save pc in thread
2074 #ifdef _M_IA64
2075 // Do not blow up if no thread info available.
2076 if (thread) {
2077 // Saving PRECISE pc (with slot information) in thread.
2078 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2079 // Convert precise PC into "Unix" format
2080 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2081 thread->set_saved_exception_pc((address)precise_pc);
2082 }
2083 // Set pc to handler
2084 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2085 // Clear out psr.ri (= Restart Instruction) in order to continue
2086 // at the beginning of the target bundle.
2087 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2088 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2089 #elif _M_AMD64
2090 // Do not blow up if no thread info available.
2091 if (thread) {
2092 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2093 }
2094 // Set pc to handler
2095 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2096 #else
2097 // Do not blow up if no thread info available.
2098 if (thread) {
2099 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2100 }
2101 // Set pc to handler
2102 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2103 #endif
2104
2105 // Continue the execution
2106 return EXCEPTION_CONTINUE_EXECUTION;
2107 }
2108
2109
2110 // Used for PostMortemDump
2111 extern "C" void safepoints();
2112 extern "C" void find(int x);
2113 extern "C" void events();
2114
2115 // According to Windows API documentation, an illegal instruction sequence should generate
2116 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2117 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2118 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2119
2120 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2121
2122 // From "Execution Protection in the Windows Operating System" draft 0.35
2123 // Once a system header becomes available, the "real" define should be
2124 // included or copied here.
2125 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2126
2127 // Handle NAT Bit consumption on IA64.
2128 #ifdef _M_IA64
2129 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2130 #endif
2131
2132 // Windows Vista/2008 heap corruption check
2133 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2134
2135 #define def_excpt(val) #val, val
2136
2137 struct siglabel {
2138 char *name;
2139 int number;
2140 };
2141
2142 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2143 // C++ compiler contain this error code. Because this is a compiler-generated
2144 // error, the code is not listed in the Win32 API header files.
2145 // The code is actually a cryptic mnemonic device, with the initial "E"
2146 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2147 // ASCII values of "msc".
2148
2149 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2150
2151
2152 struct siglabel exceptlabels[] = {
2153 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2154 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2155 def_excpt(EXCEPTION_BREAKPOINT),
2156 def_excpt(EXCEPTION_SINGLE_STEP),
2157 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2158 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2159 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2160 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2161 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2162 def_excpt(EXCEPTION_FLT_OVERFLOW),
2163 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2164 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2165 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2166 def_excpt(EXCEPTION_INT_OVERFLOW),
2167 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2168 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2169 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2170 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2171 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2172 def_excpt(EXCEPTION_STACK_OVERFLOW),
2173 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2174 def_excpt(EXCEPTION_GUARD_PAGE),
2175 def_excpt(EXCEPTION_INVALID_HANDLE),
2176 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2177 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2178 #ifdef _M_IA64
2179 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2180 #endif
2181 NULL, 0
2182 };
2183
2184 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2185 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2186 if (exceptlabels[i].number == exception_code) {
2187 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2188 return buf;
2189 }
2190 }
2191
2192 return NULL;
2193 }
2194
2195 //-----------------------------------------------------------------------------
2196 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2197 // handle exception caused by idiv; should only happen for -MinInt/-1
2198 // (division by zero is handled explicitly)
2199 #ifdef _M_IA64
2200 assert(0, "Fix Handle_IDiv_Exception");
2201 #elif _M_AMD64
2202 PCONTEXT ctx = exceptionInfo->ContextRecord;
2203 address pc = (address)ctx->Rip;
2204 assert(pc[0] == 0xF7, "not an idiv opcode");
2205 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2206 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2207 // set correct result values and continue after idiv instruction
2208 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2209 ctx->Rax = (DWORD)min_jint; // result
2210 ctx->Rdx = (DWORD)0; // remainder
2211 // Continue the execution
2212 #else
2213 PCONTEXT ctx = exceptionInfo->ContextRecord;
2214 address pc = (address)ctx->Eip;
2215 assert(pc[0] == 0xF7, "not an idiv opcode");
2216 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2217 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2218 // set correct result values and continue after idiv instruction
2219 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2220 ctx->Eax = (DWORD)min_jint; // result
2221 ctx->Edx = (DWORD)0; // remainder
2222 // Continue the execution
2223 #endif
2224 return EXCEPTION_CONTINUE_EXECUTION;
2225 }
2226
2227 #ifndef _WIN64
2228 //-----------------------------------------------------------------------------
2229 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2230 // handle exception caused by native method modifying control word
2231 PCONTEXT ctx = exceptionInfo->ContextRecord;
2232 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2233
2234 switch (exception_code) {
2235 case EXCEPTION_FLT_DENORMAL_OPERAND:
2236 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2237 case EXCEPTION_FLT_INEXACT_RESULT:
2238 case EXCEPTION_FLT_INVALID_OPERATION:
2239 case EXCEPTION_FLT_OVERFLOW:
2240 case EXCEPTION_FLT_STACK_CHECK:
2241 case EXCEPTION_FLT_UNDERFLOW:
2242 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2243 if (fp_control_word != ctx->FloatSave.ControlWord) {
2244 // Restore FPCW and mask out FLT exceptions
2245 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2246 // Mask out pending FLT exceptions
2247 ctx->FloatSave.StatusWord &= 0xffffff00;
2248 return EXCEPTION_CONTINUE_EXECUTION;
2249 }
2250 }
2251
2252 if (prev_uef_handler != NULL) {
2253 // We didn't handle this exception so pass it to the previous
2254 // UnhandledExceptionFilter.
2255 return (prev_uef_handler)(exceptionInfo);
2256 }
2257
2258 return EXCEPTION_CONTINUE_SEARCH;
2259 }
2260 #else //_WIN64
2261 /*
2262 On Windows, the mxcsr control bits are non-volatile across calls
2263 See also CR 6192333
2264 If EXCEPTION_FLT_* happened after some native method modified
2265 mxcsr - it is not a jvm fault.
2266 However should we decide to restore of mxcsr after a faulty
2267 native method we can uncomment following code
2268 jint MxCsr = INITIAL_MXCSR;
2269 // we can't use StubRoutines::addr_mxcsr_std()
2270 // because in Win64 mxcsr is not saved there
2271 if (MxCsr != ctx->MxCsr) {
2272 ctx->MxCsr = MxCsr;
2273 return EXCEPTION_CONTINUE_EXECUTION;
2274 }
2275
2276 */
2277 #endif //_WIN64
2278
2279
2280 // Fatal error reporting is single threaded so we can make this a
2281 // static and preallocated. If it's more than MAX_PATH silently ignore
2282 // it.
2283 static char saved_error_file[MAX_PATH] = {0};
2284
2285 void os::set_error_file(const char *logfile) {
2286 if (strlen(logfile) <= MAX_PATH) {
2287 strncpy(saved_error_file, logfile, MAX_PATH);
2288 }
2289 }
2290
2291 static inline void report_error(Thread* t, DWORD exception_code,
2292 address addr, void* siginfo, void* context) {
2293 VMError err(t, exception_code, addr, siginfo, context);
2294 err.report_and_die();
2295
2296 // If UseOsErrorReporting, this will return here and save the error file
2297 // somewhere where we can find it in the minidump.
2298 }
2299
2300 //-----------------------------------------------------------------------------
2301 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2302 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2303 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2304 #ifdef _M_IA64
2305 // On Itanium, we need the "precise pc", which has the slot number coded
2306 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2307 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2308 // Convert the pc to "Unix format", which has the slot number coded
2309 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2310 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2311 // information is saved in the Unix format.
2312 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2313 #elif _M_AMD64
2314 address pc = (address) exceptionInfo->ContextRecord->Rip;
2315 #else
2316 address pc = (address) exceptionInfo->ContextRecord->Eip;
2317 #endif
2318 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2319
2320 #ifndef _WIN64
2321 // Execution protection violation - win32 running on AMD64 only
2322 // Handled first to avoid misdiagnosis as a "normal" access violation;
2323 // This is safe to do because we have a new/unique ExceptionInformation
2324 // code for this condition.
2325 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2326 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2327 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2328 address addr = (address) exceptionRecord->ExceptionInformation[1];
2329
2330 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2331 int page_size = os::vm_page_size();
2332
2333 // Make sure the pc and the faulting address are sane.
2334 //
2335 // If an instruction spans a page boundary, and the page containing
2336 // the beginning of the instruction is executable but the following
2337 // page is not, the pc and the faulting address might be slightly
2338 // different - we still want to unguard the 2nd page in this case.
2339 //
2340 // 15 bytes seems to be a (very) safe value for max instruction size.
2341 bool pc_is_near_addr =
2342 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2343 bool instr_spans_page_boundary =
2344 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2345 (intptr_t) page_size) > 0);
2346
2347 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2348 static volatile address last_addr =
2349 (address) os::non_memory_address_word();
2350
2351 // In conservative mode, don't unguard unless the address is in the VM
2352 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2353 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2354
2355 // Set memory to RWX and retry
2356 address page_start =
2357 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2358 bool res = os::protect_memory((char*) page_start, page_size,
2359 os::MEM_PROT_RWX);
2360
2361 if (PrintMiscellaneous && Verbose) {
2362 char buf[256];
2363 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2364 "at " INTPTR_FORMAT
2365 ", unguarding " INTPTR_FORMAT ": %s", addr,
2366 page_start, (res ? "success" : strerror(errno)));
2367 tty->print_raw_cr(buf);
2368 }
2369
2370 // Set last_addr so if we fault again at the same address, we don't
2371 // end up in an endless loop.
2372 //
2373 // There are two potential complications here. Two threads trapping
2374 // at the same address at the same time could cause one of the
2375 // threads to think it already unguarded, and abort the VM. Likely
2376 // very rare.
2377 //
2378 // The other race involves two threads alternately trapping at
2379 // different addresses and failing to unguard the page, resulting in
2380 // an endless loop. This condition is probably even more unlikely
2381 // than the first.
2382 //
2383 // Although both cases could be avoided by using locks or thread
2384 // local last_addr, these solutions are unnecessary complication:
2385 // this handler is a best-effort safety net, not a complete solution.
2386 // It is disabled by default and should only be used as a workaround
2387 // in case we missed any no-execute-unsafe VM code.
2388
2389 last_addr = addr;
2390
2391 return EXCEPTION_CONTINUE_EXECUTION;
2392 }
2393 }
2394
2395 // Last unguard failed or not unguarding
2396 tty->print_raw_cr("Execution protection violation");
2397 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2398 exceptionInfo->ContextRecord);
2399 return EXCEPTION_CONTINUE_SEARCH;
2400 }
2401 }
2402 #endif // _WIN64
2403
2404 // Check to see if we caught the safepoint code in the
2405 // process of write protecting the memory serialization page.
2406 // It write enables the page immediately after protecting it
2407 // so just return.
2408 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2409 JavaThread* thread = (JavaThread*) t;
2410 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2411 address addr = (address) exceptionRecord->ExceptionInformation[1];
2412 if ( os::is_memory_serialize_page(thread, addr) ) {
2413 // Block current thread until the memory serialize page permission restored.
2414 os::block_on_serialize_page_trap();
2415 return EXCEPTION_CONTINUE_EXECUTION;
2416 }
2417 }
2418
2419 if (t != NULL && t->is_Java_thread()) {
2420 JavaThread* thread = (JavaThread*) t;
2421 bool in_java = thread->thread_state() == _thread_in_Java;
2422
2423 // Handle potential stack overflows up front.
2424 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2425 if (os::uses_stack_guard_pages()) {
2426 #ifdef _M_IA64
2427 // Use guard page for register stack.
2428 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2429 address addr = (address) exceptionRecord->ExceptionInformation[1];
2430 // Check for a register stack overflow on Itanium
2431 if (thread->addr_inside_register_stack_red_zone(addr)) {
2432 // Fatal red zone violation happens if the Java program
2433 // catches a StackOverflow error and does so much processing
2434 // that it runs beyond the unprotected yellow guard zone. As
2435 // a result, we are out of here.
2436 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2437 } else if(thread->addr_inside_register_stack(addr)) {
2438 // Disable the yellow zone which sets the state that
2439 // we've got a stack overflow problem.
2440 if (thread->stack_yellow_zone_enabled()) {
2441 thread->disable_stack_yellow_zone();
2442 }
2443 // Give us some room to process the exception.
2444 thread->disable_register_stack_guard();
2445 // Tracing with +Verbose.
2446 if (Verbose) {
2447 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2448 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2449 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2450 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2451 thread->register_stack_base(),
2452 thread->register_stack_base() + thread->stack_size());
2453 }
2454
2455 // Reguard the permanent register stack red zone just to be sure.
2456 // We saw Windows silently disabling this without telling us.
2457 thread->enable_register_stack_red_zone();
2458
2459 return Handle_Exception(exceptionInfo,
2460 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2461 }
2462 #endif
2463 if (thread->stack_yellow_zone_enabled()) {
2464 // Yellow zone violation. The o/s has unprotected the first yellow
2465 // zone page for us. Note: must call disable_stack_yellow_zone to
2466 // update the enabled status, even if the zone contains only one page.
2467 thread->disable_stack_yellow_zone();
2468 // If not in java code, return and hope for the best.
2469 return in_java ? Handle_Exception(exceptionInfo,
2470 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2471 : EXCEPTION_CONTINUE_EXECUTION;
2472 } else {
2473 // Fatal red zone violation.
2474 thread->disable_stack_red_zone();
2475 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2476 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2477 exceptionInfo->ContextRecord);
2478 return EXCEPTION_CONTINUE_SEARCH;
2479 }
2480 } else if (in_java) {
2481 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2482 // a one-time-only guard page, which it has released to us. The next
2483 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2484 return Handle_Exception(exceptionInfo,
2485 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2486 } else {
2487 // Can only return and hope for the best. Further stack growth will
2488 // result in an ACCESS_VIOLATION.
2489 return EXCEPTION_CONTINUE_EXECUTION;
2490 }
2491 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2492 // Either stack overflow or null pointer exception.
2493 if (in_java) {
2494 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2495 address addr = (address) exceptionRecord->ExceptionInformation[1];
2496 address stack_end = thread->stack_base() - thread->stack_size();
2497 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2498 // Stack overflow.
2499 assert(!os::uses_stack_guard_pages(),
2500 "should be caught by red zone code above.");
2501 return Handle_Exception(exceptionInfo,
2502 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2503 }
2504 //
2505 // Check for safepoint polling and implicit null
2506 // We only expect null pointers in the stubs (vtable)
2507 // the rest are checked explicitly now.
2508 //
2509 CodeBlob* cb = CodeCache::find_blob(pc);
2510 if (cb != NULL) {
2511 if (os::is_poll_address(addr)) {
2512 address stub = SharedRuntime::get_poll_stub(pc);
2513 return Handle_Exception(exceptionInfo, stub);
2514 }
2515 }
2516 {
2517 #ifdef _WIN64
2518 //
2519 // If it's a legal stack address map the entire region in
2520 //
2521 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2522 address addr = (address) exceptionRecord->ExceptionInformation[1];
2523 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2524 addr = (address)((uintptr_t)addr &
2525 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2526 os::commit_memory((char *)addr, thread->stack_base() - addr,
2527 false );
2528 return EXCEPTION_CONTINUE_EXECUTION;
2529 }
2530 else
2531 #endif
2532 {
2533 // Null pointer exception.
2534 #ifdef _M_IA64
2535 // Process implicit null checks in compiled code. Note: Implicit null checks
2536 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2537 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2538 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2539 // Handle implicit null check in UEP method entry
2540 if (cb && (cb->is_frame_complete_at(pc) ||
2541 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2542 if (Verbose) {
2543 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2544 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2545 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2546 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2547 *(bundle_start + 1), *bundle_start);
2548 }
2549 return Handle_Exception(exceptionInfo,
2550 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2551 }
2552 }
2553
2554 // Implicit null checks were processed above. Hence, we should not reach
2555 // here in the usual case => die!
2556 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2557 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2558 exceptionInfo->ContextRecord);
2559 return EXCEPTION_CONTINUE_SEARCH;
2560
2561 #else // !IA64
2562
2563 // Windows 98 reports faulting addresses incorrectly
2564 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2565 !os::win32::is_nt()) {
2566 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2567 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2568 }
2569 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2570 exceptionInfo->ContextRecord);
2571 return EXCEPTION_CONTINUE_SEARCH;
2572 #endif
2573 }
2574 }
2575 }
2576
2577 #ifdef _WIN64
2578 // Special care for fast JNI field accessors.
2579 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2580 // in and the heap gets shrunk before the field access.
2581 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2582 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2583 if (addr != (address)-1) {
2584 return Handle_Exception(exceptionInfo, addr);
2585 }
2586 }
2587 #endif
2588
2589 // Stack overflow or null pointer exception in native code.
2590 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2591 exceptionInfo->ContextRecord);
2592 return EXCEPTION_CONTINUE_SEARCH;
2593 } // /EXCEPTION_ACCESS_VIOLATION
2594 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2595 #if defined _M_IA64
2596 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2597 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2598 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2599
2600 // Compiled method patched to be non entrant? Following conditions must apply:
2601 // 1. must be first instruction in bundle
2602 // 2. must be a break instruction with appropriate code
2603 if((((uint64_t) pc & 0x0F) == 0) &&
2604 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2605 return Handle_Exception(exceptionInfo,
2606 (address)SharedRuntime::get_handle_wrong_method_stub());
2607 }
2608 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2609 #endif
2610
2611
2612 if (in_java) {
2613 switch (exception_code) {
2614 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2615 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2616
2617 case EXCEPTION_INT_OVERFLOW:
2618 return Handle_IDiv_Exception(exceptionInfo);
2619
2620 } // switch
2621 }
2622 #ifndef _WIN64
2623 if (((thread->thread_state() == _thread_in_Java) ||
2624 (thread->thread_state() == _thread_in_native)) &&
2625 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2626 {
2627 LONG result=Handle_FLT_Exception(exceptionInfo);
2628 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2629 }
2630 #endif //_WIN64
2631 }
2632
2633 if (exception_code != EXCEPTION_BREAKPOINT) {
2634 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2635 exceptionInfo->ContextRecord);
2636 }
2637 return EXCEPTION_CONTINUE_SEARCH;
2638 }
2639
2640 #ifndef _WIN64
2641 // Special care for fast JNI accessors.
2642 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2643 // the heap gets shrunk before the field access.
2644 // Need to install our own structured exception handler since native code may
2645 // install its own.
2646 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2647 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2648 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2649 address pc = (address) exceptionInfo->ContextRecord->Eip;
2650 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2651 if (addr != (address)-1) {
2652 return Handle_Exception(exceptionInfo, addr);
2653 }
2654 }
2655 return EXCEPTION_CONTINUE_SEARCH;
2656 }
2657
2658 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2659 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2660 __try { \
2661 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2662 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2663 } \
2664 return 0; \
2665 }
2666
2667 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2668 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2669 DEFINE_FAST_GETFIELD(jchar, char, Char)
2670 DEFINE_FAST_GETFIELD(jshort, short, Short)
2671 DEFINE_FAST_GETFIELD(jint, int, Int)
2672 DEFINE_FAST_GETFIELD(jlong, long, Long)
2673 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2674 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2675
2676 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2677 switch (type) {
2678 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2679 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2680 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2681 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2682 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2683 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2684 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2685 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2686 default: ShouldNotReachHere();
2687 }
2688 return (address)-1;
2689 }
2690 #endif
2691
2692 // Virtual Memory
2693
2694 int os::vm_page_size() { return os::win32::vm_page_size(); }
2695 int os::vm_allocation_granularity() {
2696 return os::win32::vm_allocation_granularity();
2697 }
2698
2699 // Windows large page support is available on Windows 2003. In order to use
2700 // large page memory, the administrator must first assign additional privilege
2701 // to the user:
2702 // + select Control Panel -> Administrative Tools -> Local Security Policy
2703 // + select Local Policies -> User Rights Assignment
2704 // + double click "Lock pages in memory", add users and/or groups
2705 // + reboot
2706 // Note the above steps are needed for administrator as well, as administrators
2707 // by default do not have the privilege to lock pages in memory.
2708 //
2709 // Note about Windows 2003: although the API supports committing large page
2710 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2711 // scenario, I found through experiment it only uses large page if the entire
2712 // memory region is reserved and committed in a single VirtualAlloc() call.
2713 // This makes Windows large page support more or less like Solaris ISM, in
2714 // that the entire heap must be committed upfront. This probably will change
2715 // in the future, if so the code below needs to be revisited.
2716
2717 #ifndef MEM_LARGE_PAGES
2718 #define MEM_LARGE_PAGES 0x20000000
2719 #endif
2720
2721 static HANDLE _hProcess;
2722 static HANDLE _hToken;
2723
2724 // Container for NUMA node list info
2725 class NUMANodeListHolder {
2726 private:
2727 int *_numa_used_node_list; // allocated below
2728 int _numa_used_node_count;
2729
2730 void free_node_list() {
2731 if (_numa_used_node_list != NULL) {
2732 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2733 }
2734 }
2735
2736 public:
2737 NUMANodeListHolder() {
2738 _numa_used_node_count = 0;
2739 _numa_used_node_list = NULL;
2740 // do rest of initialization in build routine (after function pointers are set up)
2741 }
2742
2743 ~NUMANodeListHolder() {
2744 free_node_list();
2745 }
2746
2747 bool build() {
2748 DWORD_PTR proc_aff_mask;
2749 DWORD_PTR sys_aff_mask;
2750 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2751 ULONG highest_node_number;
2752 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2753 free_node_list();
2754 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2755 for (unsigned int i = 0; i <= highest_node_number; i++) {
2756 ULONGLONG proc_mask_numa_node;
2757 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2758 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2759 _numa_used_node_list[_numa_used_node_count++] = i;
2760 }
2761 }
2762 return (_numa_used_node_count > 1);
2763 }
2764
2765 int get_count() {return _numa_used_node_count;}
2766 int get_node_list_entry(int n) {
2767 // for indexes out of range, returns -1
2768 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2769 }
2770
2771 } numa_node_list_holder;
2772
2773
2774
2775 static size_t _large_page_size = 0;
2776
2777 static bool resolve_functions_for_large_page_init() {
2778 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2779 os::Advapi32Dll::AdvapiAvailable();
2780 }
2781
2782 static bool request_lock_memory_privilege() {
2783 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2784 os::current_process_id());
2785
2786 LUID luid;
2787 if (_hProcess != NULL &&
2788 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2789 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2790
2791 TOKEN_PRIVILEGES tp;
2792 tp.PrivilegeCount = 1;
2793 tp.Privileges[0].Luid = luid;
2794 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2795
2796 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2797 // privilege. Check GetLastError() too. See MSDN document.
2798 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2799 (GetLastError() == ERROR_SUCCESS)) {
2800 return true;
2801 }
2802 }
2803
2804 return false;
2805 }
2806
2807 static void cleanup_after_large_page_init() {
2808 if (_hProcess) CloseHandle(_hProcess);
2809 _hProcess = NULL;
2810 if (_hToken) CloseHandle(_hToken);
2811 _hToken = NULL;
2812 }
2813
2814 static bool numa_interleaving_init() {
2815 bool success = false;
2816 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2817
2818 // print a warning if UseNUMAInterleaving flag is specified on command line
2819 bool warn_on_failure = use_numa_interleaving_specified;
2820 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2821
2822 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2823 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2824 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2825
2826 if (os::Kernel32Dll::NumaCallsAvailable()) {
2827 if (numa_node_list_holder.build()) {
2828 if (PrintMiscellaneous && Verbose) {
2829 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2830 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2831 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2832 }
2833 tty->print("\n");
2834 }
2835 success = true;
2836 } else {
2837 WARN("Process does not cover multiple NUMA nodes.");
2838 }
2839 } else {
2840 WARN("NUMA Interleaving is not supported by the operating system.");
2841 }
2842 if (!success) {
2843 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2844 }
2845 return success;
2846 #undef WARN
2847 }
2848
2849 // this routine is used whenever we need to reserve a contiguous VA range
2850 // but we need to make separate VirtualAlloc calls for each piece of the range
2851 // Reasons for doing this:
2852 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2853 // * UseNUMAInterleaving requires a separate node for each piece
2854 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2855 bool should_inject_error=false) {
2856 char * p_buf;
2857 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2858 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2859 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2860
2861 // first reserve enough address space in advance since we want to be
2862 // able to break a single contiguous virtual address range into multiple
2863 // large page commits but WS2003 does not allow reserving large page space
2864 // so we just use 4K pages for reserve, this gives us a legal contiguous
2865 // address space. then we will deallocate that reservation, and re alloc
2866 // using large pages
2867 const size_t size_of_reserve = bytes + chunk_size;
2868 if (bytes > size_of_reserve) {
2869 // Overflowed.
2870 return NULL;
2871 }
2872 p_buf = (char *) VirtualAlloc(addr,
2873 size_of_reserve, // size of Reserve
2874 MEM_RESERVE,
2875 PAGE_READWRITE);
2876 // If reservation failed, return NULL
2877 if (p_buf == NULL) return NULL;
2878 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2879 os::release_memory(p_buf, bytes + chunk_size);
2880
2881 // we still need to round up to a page boundary (in case we are using large pages)
2882 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2883 // instead we handle this in the bytes_to_rq computation below
2884 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2885
2886 // now go through and allocate one chunk at a time until all bytes are
2887 // allocated
2888 size_t bytes_remaining = bytes;
2889 // An overflow of align_size_up() would have been caught above
2890 // in the calculation of size_of_reserve.
2891 char * next_alloc_addr = p_buf;
2892 HANDLE hProc = GetCurrentProcess();
2893
2894 #ifdef ASSERT
2895 // Variable for the failure injection
2896 long ran_num = os::random();
2897 size_t fail_after = ran_num % bytes;
2898 #endif
2899
2900 int count=0;
2901 while (bytes_remaining) {
2902 // select bytes_to_rq to get to the next chunk_size boundary
2903
2904 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2905 // Note allocate and commit
2906 char * p_new;
2907
2908 #ifdef ASSERT
2909 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2910 #else
2911 const bool inject_error_now = false;
2912 #endif
2913
2914 if (inject_error_now) {
2915 p_new = NULL;
2916 } else {
2917 if (!UseNUMAInterleaving) {
2918 p_new = (char *) VirtualAlloc(next_alloc_addr,
2919 bytes_to_rq,
2920 flags,
2921 prot);
2922 } else {
2923 // get the next node to use from the used_node_list
2924 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2925 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2926 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2927 next_alloc_addr,
2928 bytes_to_rq,
2929 flags,
2930 prot,
2931 node);
2932 }
2933 }
2934
2935 if (p_new == NULL) {
2936 // Free any allocated pages
2937 if (next_alloc_addr > p_buf) {
2938 // Some memory was committed so release it.
2939 size_t bytes_to_release = bytes - bytes_remaining;
2940 // NMT has yet to record any individual blocks, so it
2941 // need to create a dummy 'reserve' record to match
2942 // the release.
2943 MemTracker::record_virtual_memory_reserve((address)p_buf,
2944 bytes_to_release, CALLER_PC);
2945 os::release_memory(p_buf, bytes_to_release);
2946 }
2947 #ifdef ASSERT
2948 if (should_inject_error) {
2949 if (TracePageSizes && Verbose) {
2950 tty->print_cr("Reserving pages individually failed.");
2951 }
2952 }
2953 #endif
2954 return NULL;
2955 }
2956
2957 bytes_remaining -= bytes_to_rq;
2958 next_alloc_addr += bytes_to_rq;
2959 count++;
2960 }
2961 // Although the memory is allocated individually, it is returned as one.
2962 // NMT records it as one block.
2963 address pc = CALLER_PC;
2964 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, pc);
2965 if ((flags & MEM_COMMIT) != 0) {
2966 MemTracker::record_virtual_memory_commit((address)p_buf, bytes, pc);
2967 }
2968
2969 // made it this far, success
2970 return p_buf;
2971 }
2972
2973
2974
2975 void os::large_page_init() {
2976 if (!UseLargePages) return;
2977
2978 // print a warning if any large page related flag is specified on command line
2979 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2980 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2981 bool success = false;
2982
2983 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2984 if (resolve_functions_for_large_page_init()) {
2985 if (request_lock_memory_privilege()) {
2986 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2987 if (s) {
2988 #if defined(IA32) || defined(AMD64)
2989 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2990 WARN("JVM cannot use large pages bigger than 4mb.");
2991 } else {
2992 #endif
2993 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2994 _large_page_size = LargePageSizeInBytes;
2995 } else {
2996 _large_page_size = s;
2997 }
2998 success = true;
2999 #if defined(IA32) || defined(AMD64)
3000 }
3001 #endif
3002 } else {
3003 WARN("Large page is not supported by the processor.");
3004 }
3005 } else {
3006 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3007 }
3008 } else {
3009 WARN("Large page is not supported by the operating system.");
3010 }
3011 #undef WARN
3012
3013 const size_t default_page_size = (size_t) vm_page_size();
3014 if (success && _large_page_size > default_page_size) {
3015 _page_sizes[0] = _large_page_size;
3016 _page_sizes[1] = default_page_size;
3017 _page_sizes[2] = 0;
3018 }
3019
3020 cleanup_after_large_page_init();
3021 UseLargePages = success;
3022 }
3023
3024 // On win32, one cannot release just a part of reserved memory, it's an
3025 // all or nothing deal. When we split a reservation, we must break the
3026 // reservation into two reservations.
3027 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3028 bool realloc) {
3029 if (size > 0) {
3030 release_memory(base, size);
3031 if (realloc) {
3032 reserve_memory(split, base);
3033 }
3034 if (size != split) {
3035 reserve_memory(size - split, base + split);
3036 }
3037 }
3038 }
3039
3040 // Multiple threads can race in this code but it's not possible to unmap small sections of
3041 // virtual space to get requested alignment, like posix-like os's.
3042 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3043 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3044 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3045 "Alignment must be a multiple of allocation granularity (page size)");
3046 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3047
3048 size_t extra_size = size + alignment;
3049 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3050
3051 char* aligned_base = NULL;
3052
3053 do {
3054 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3055 if (extra_base == NULL) {
3056 return NULL;
3057 }
3058 // Do manual alignment
3059 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3060
3061 os::release_memory(extra_base, extra_size);
3062
3063 aligned_base = os::reserve_memory(size, aligned_base);
3064
3065 } while (aligned_base == NULL);
3066
3067 return aligned_base;
3068 }
3069
3070 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3071 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3072 "reserve alignment");
3073 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3074 char* res;
3075 // note that if UseLargePages is on, all the areas that require interleaving
3076 // will go thru reserve_memory_special rather than thru here.
3077 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3078 if (!use_individual) {
3079 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3080 } else {
3081 elapsedTimer reserveTimer;
3082 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3083 // in numa interleaving, we have to allocate pages individually
3084 // (well really chunks of NUMAInterleaveGranularity size)
3085 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3086 if (res == NULL) {
3087 warning("NUMA page allocation failed");
3088 }
3089 if( Verbose && PrintMiscellaneous ) {
3090 reserveTimer.stop();
3091 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3092 reserveTimer.milliseconds(), reserveTimer.ticks());
3093 }
3094 }
3095 assert(res == NULL || addr == NULL || addr == res,
3096 "Unexpected address from reserve.");
3097
3098 return res;
3099 }
3100
3101 // Reserve memory at an arbitrary address, only if that area is
3102 // available (and not reserved for something else).
3103 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3104 // Windows os::reserve_memory() fails of the requested address range is
3105 // not avilable.
3106 return reserve_memory(bytes, requested_addr);
3107 }
3108
3109 size_t os::large_page_size() {
3110 return _large_page_size;
3111 }
3112
3113 bool os::can_commit_large_page_memory() {
3114 // Windows only uses large page memory when the entire region is reserved
3115 // and committed in a single VirtualAlloc() call. This may change in the
3116 // future, but with Windows 2003 it's not possible to commit on demand.
3117 return false;
3118 }
3119
3120 bool os::can_execute_large_page_memory() {
3121 return true;
3122 }
3123
3124 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3125
3126 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3127 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3128
3129 // with large pages, there are two cases where we need to use Individual Allocation
3130 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3131 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3132 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3133 if (TracePageSizes && Verbose) {
3134 tty->print_cr("Reserving large pages individually.");
3135 }
3136 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3137 if (p_buf == NULL) {
3138 // give an appropriate warning message
3139 if (UseNUMAInterleaving) {
3140 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3141 }
3142 if (UseLargePagesIndividualAllocation) {
3143 warning("Individually allocated large pages failed, "
3144 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3145 }
3146 return NULL;
3147 }
3148
3149 return p_buf;
3150
3151 } else {
3152 // normal policy just allocate it all at once
3153 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3154 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3155 if (res != NULL) {
3156 address pc = CALLER_PC;
3157 MemTracker::record_virtual_memory_reserve((address)res, bytes, pc);
3158 MemTracker::record_virtual_memory_commit((address)res, bytes, pc);
3159 }
3160
3161 return res;
3162 }
3163 }
3164
3165 bool os::release_memory_special(char* base, size_t bytes) {
3166 assert(base != NULL, "Sanity check");
3167 // Memory allocated via reserve_memory_special() is committed
3168 MemTracker::record_virtual_memory_uncommit((address)base, bytes);
3169 return release_memory(base, bytes);
3170 }
3171
3172 void os::print_statistics() {
3173 }
3174
3175 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3176 if (bytes == 0) {
3177 // Don't bother the OS with noops.
3178 return true;
3179 }
3180 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3181 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3182 // Don't attempt to print anything if the OS call fails. We're
3183 // probably low on resources, so the print itself may cause crashes.
3184
3185 // unless we have NUMAInterleaving enabled, the range of a commit
3186 // is always within a reserve covered by a single VirtualAlloc
3187 // in that case we can just do a single commit for the requested size
3188 if (!UseNUMAInterleaving) {
3189 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3190 if (exec) {
3191 DWORD oldprot;
3192 // Windows doc says to use VirtualProtect to get execute permissions
3193 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3194 }
3195 return true;
3196 } else {
3197
3198 // when NUMAInterleaving is enabled, the commit might cover a range that
3199 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3200 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3201 // returns represents the number of bytes that can be committed in one step.
3202 size_t bytes_remaining = bytes;
3203 char * next_alloc_addr = addr;
3204 while (bytes_remaining > 0) {
3205 MEMORY_BASIC_INFORMATION alloc_info;
3206 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3207 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3208 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3209 return false;
3210 if (exec) {
3211 DWORD oldprot;
3212 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3213 return false;
3214 }
3215 bytes_remaining -= bytes_to_rq;
3216 next_alloc_addr += bytes_to_rq;
3217 }
3218 }
3219 // if we made it this far, return true
3220 return true;
3221 }
3222
3223 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3224 bool exec) {
3225 return commit_memory(addr, size, exec);
3226 }
3227
3228 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3229 if (bytes == 0) {
3230 // Don't bother the OS with noops.
3231 return true;
3232 }
3233 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3234 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3235 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3236 }
3237
3238 bool os::pd_release_memory(char* addr, size_t bytes) {
3239 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3240 }
3241
3242 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3243 return os::commit_memory(addr, size);
3244 }
3245
3246 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3247 return os::uncommit_memory(addr, size);
3248 }
3249
3250 // Set protections specified
3251 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3252 bool is_committed) {
3253 unsigned int p = 0;
3254 switch (prot) {
3255 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3256 case MEM_PROT_READ: p = PAGE_READONLY; break;
3257 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3258 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3259 default:
3260 ShouldNotReachHere();
3261 }
3262
3263 DWORD old_status;
3264
3265 // Strange enough, but on Win32 one can change protection only for committed
3266 // memory, not a big deal anyway, as bytes less or equal than 64K
3267 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3268 fatal("cannot commit protection page");
3269 }
3270 // One cannot use os::guard_memory() here, as on Win32 guard page
3271 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3272 //
3273 // Pages in the region become guard pages. Any attempt to access a guard page
3274 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3275 // the guard page status. Guard pages thus act as a one-time access alarm.
3276 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3277 }
3278
3279 bool os::guard_memory(char* addr, size_t bytes) {
3280 DWORD old_status;
3281 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3282 }
3283
3284 bool os::unguard_memory(char* addr, size_t bytes) {
3285 DWORD old_status;
3286 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3287 }
3288
3289 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3290 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3291 void os::numa_make_global(char *addr, size_t bytes) { }
3292 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3293 bool os::numa_topology_changed() { return false; }
3294 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3295 int os::numa_get_group_id() { return 0; }
3296 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3297 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3298 // Provide an answer for UMA systems
3299 ids[0] = 0;
3300 return 1;
3301 } else {
3302 // check for size bigger than actual groups_num
3303 size = MIN2(size, numa_get_groups_num());
3304 for (int i = 0; i < (int)size; i++) {
3305 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3306 }
3307 return size;
3308 }
3309 }
3310
3311 bool os::get_page_info(char *start, page_info* info) {
3312 return false;
3313 }
3314
3315 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3316 return end;
3317 }
3318
3319 char* os::non_memory_address_word() {
3320 // Must never look like an address returned by reserve_memory,
3321 // even in its subfields (as defined by the CPU immediate fields,
3322 // if the CPU splits constants across multiple instructions).
3323 return (char*)-1;
3324 }
3325
3326 #define MAX_ERROR_COUNT 100
3327 #define SYS_THREAD_ERROR 0xffffffffUL
3328
3329 void os::pd_start_thread(Thread* thread) {
3330 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3331 // Returns previous suspend state:
3332 // 0: Thread was not suspended
3333 // 1: Thread is running now
3334 // >1: Thread is still suspended.
3335 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3336 }
3337
3338 class HighResolutionInterval : public CHeapObj<mtThread> {
3339 // The default timer resolution seems to be 10 milliseconds.
3340 // (Where is this written down?)
3341 // If someone wants to sleep for only a fraction of the default,
3342 // then we set the timer resolution down to 1 millisecond for
3343 // the duration of their interval.
3344 // We carefully set the resolution back, since otherwise we
3345 // seem to incur an overhead (3%?) that we don't need.
3346 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3347 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3348 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3349 // timeBeginPeriod() if the relative error exceeded some threshold.
3350 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3351 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3352 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3353 // resolution timers running.
3354 private:
3355 jlong resolution;
3356 public:
3357 HighResolutionInterval(jlong ms) {
3358 resolution = ms % 10L;
3359 if (resolution != 0) {
3360 MMRESULT result = timeBeginPeriod(1L);
3361 }
3362 }
3363 ~HighResolutionInterval() {
3364 if (resolution != 0) {
3365 MMRESULT result = timeEndPeriod(1L);
3366 }
3367 resolution = 0L;
3368 }
3369 };
3370
3371 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3372 jlong limit = (jlong) MAXDWORD;
3373
3374 while(ms > limit) {
3375 int res;
3376 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3377 return res;
3378 ms -= limit;
3379 }
3380
3381 assert(thread == Thread::current(), "thread consistency check");
3382 OSThread* osthread = thread->osthread();
3383 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3384 int result;
3385 if (interruptable) {
3386 assert(thread->is_Java_thread(), "must be java thread");
3387 JavaThread *jt = (JavaThread *) thread;
3388 ThreadBlockInVM tbivm(jt);
3389
3390 jt->set_suspend_equivalent();
3391 // cleared by handle_special_suspend_equivalent_condition() or
3392 // java_suspend_self() via check_and_wait_while_suspended()
3393
3394 HANDLE events[1];
3395 events[0] = osthread->interrupt_event();
3396 HighResolutionInterval *phri=NULL;
3397 if(!ForceTimeHighResolution)
3398 phri = new HighResolutionInterval( ms );
3399 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3400 result = OS_TIMEOUT;
3401 } else {
3402 ResetEvent(osthread->interrupt_event());
3403 osthread->set_interrupted(false);
3404 result = OS_INTRPT;
3405 }
3406 delete phri; //if it is NULL, harmless
3407
3408 // were we externally suspended while we were waiting?
3409 jt->check_and_wait_while_suspended();
3410 } else {
3411 assert(!thread->is_Java_thread(), "must not be java thread");
3412 Sleep((long) ms);
3413 result = OS_TIMEOUT;
3414 }
3415 return result;
3416 }
3417
3418 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3419 void os::infinite_sleep() {
3420 while (true) { // sleep forever ...
3421 Sleep(100000); // ... 100 seconds at a time
3422 }
3423 }
3424
3425 typedef BOOL (WINAPI * STTSignature)(void) ;
3426
3427 os::YieldResult os::NakedYield() {
3428 // Use either SwitchToThread() or Sleep(0)
3429 // Consider passing back the return value from SwitchToThread().
3430 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3431 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3432 } else {
3433 Sleep(0);
3434 }
3435 return os::YIELD_UNKNOWN ;
3436 }
3437
3438 void os::yield() { os::NakedYield(); }
3439
3440 void os::yield_all(int attempts) {
3441 // Yields to all threads, including threads with lower priorities
3442 Sleep(1);
3443 }
3444
3445 // Win32 only gives you access to seven real priorities at a time,
3446 // so we compress Java's ten down to seven. It would be better
3447 // if we dynamically adjusted relative priorities.
3448
3449 int os::java_to_os_priority[CriticalPriority + 1] = {
3450 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3451 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3452 THREAD_PRIORITY_LOWEST, // 2
3453 THREAD_PRIORITY_BELOW_NORMAL, // 3
3454 THREAD_PRIORITY_BELOW_NORMAL, // 4
3455 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3456 THREAD_PRIORITY_NORMAL, // 6
3457 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3458 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3459 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3460 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3461 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3462 };
3463
3464 int prio_policy1[CriticalPriority + 1] = {
3465 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3466 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3467 THREAD_PRIORITY_LOWEST, // 2
3468 THREAD_PRIORITY_BELOW_NORMAL, // 3
3469 THREAD_PRIORITY_BELOW_NORMAL, // 4
3470 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3471 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3472 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3473 THREAD_PRIORITY_HIGHEST, // 8
3474 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3475 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3476 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3477 };
3478
3479 static int prio_init() {
3480 // If ThreadPriorityPolicy is 1, switch tables
3481 if (ThreadPriorityPolicy == 1) {
3482 int i;
3483 for (i = 0; i < CriticalPriority + 1; i++) {
3484 os::java_to_os_priority[i] = prio_policy1[i];
3485 }
3486 }
3487 if (UseCriticalJavaThreadPriority) {
3488 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3489 }
3490 return 0;
3491 }
3492
3493 OSReturn os::set_native_priority(Thread* thread, int priority) {
3494 if (!UseThreadPriorities) return OS_OK;
3495 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3496 return ret ? OS_OK : OS_ERR;
3497 }
3498
3499 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3500 if ( !UseThreadPriorities ) {
3501 *priority_ptr = java_to_os_priority[NormPriority];
3502 return OS_OK;
3503 }
3504 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3505 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3506 assert(false, "GetThreadPriority failed");
3507 return OS_ERR;
3508 }
3509 *priority_ptr = os_prio;
3510 return OS_OK;
3511 }
3512
3513
3514 // Hint to the underlying OS that a task switch would not be good.
3515 // Void return because it's a hint and can fail.
3516 void os::hint_no_preempt() {}
3517
3518 void os::interrupt(Thread* thread) {
3519 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3520 "possibility of dangling Thread pointer");
3521
3522 OSThread* osthread = thread->osthread();
3523 osthread->set_interrupted(true);
3524 // More than one thread can get here with the same value of osthread,
3525 // resulting in multiple notifications. We do, however, want the store
3526 // to interrupted() to be visible to other threads before we post
3527 // the interrupt event.
3528 OrderAccess::release();
3529 SetEvent(osthread->interrupt_event());
3530 // For JSR166: unpark after setting status
3531 if (thread->is_Java_thread())
3532 ((JavaThread*)thread)->parker()->unpark();
3533
3534 ParkEvent * ev = thread->_ParkEvent ;
3535 if (ev != NULL) ev->unpark() ;
3536
3537 }
3538
3539
3540 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3541 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3542 "possibility of dangling Thread pointer");
3543
3544 OSThread* osthread = thread->osthread();
3545 bool interrupted = osthread->interrupted();
3546 // There is no synchronization between the setting of the interrupt
3547 // and it being cleared here. It is critical - see 6535709 - that
3548 // we only clear the interrupt state, and reset the interrupt event,
3549 // if we are going to report that we were indeed interrupted - else
3550 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3551 // depending on the timing
3552 if (interrupted && clear_interrupted) {
3553 osthread->set_interrupted(false);
3554 ResetEvent(osthread->interrupt_event());
3555 } // Otherwise leave the interrupted state alone
3556
3557 return interrupted;
3558 }
3559
3560 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3561 ExtendedPC os::get_thread_pc(Thread* thread) {
3562 CONTEXT context;
3563 context.ContextFlags = CONTEXT_CONTROL;
3564 HANDLE handle = thread->osthread()->thread_handle();
3565 #ifdef _M_IA64
3566 assert(0, "Fix get_thread_pc");
3567 return ExtendedPC(NULL);
3568 #else
3569 if (GetThreadContext(handle, &context)) {
3570 #ifdef _M_AMD64
3571 return ExtendedPC((address) context.Rip);
3572 #else
3573 return ExtendedPC((address) context.Eip);
3574 #endif
3575 } else {
3576 return ExtendedPC(NULL);
3577 }
3578 #endif
3579 }
3580
3581 // GetCurrentThreadId() returns DWORD
3582 intx os::current_thread_id() { return GetCurrentThreadId(); }
3583
3584 static int _initial_pid = 0;
3585
3586 int os::current_process_id()
3587 {
3588 return (_initial_pid ? _initial_pid : _getpid());
3589 }
3590
3591 int os::win32::_vm_page_size = 0;
3592 int os::win32::_vm_allocation_granularity = 0;
3593 int os::win32::_processor_type = 0;
3594 // Processor level is not available on non-NT systems, use vm_version instead
3595 int os::win32::_processor_level = 0;
3596 julong os::win32::_physical_memory = 0;
3597 size_t os::win32::_default_stack_size = 0;
3598
3599 intx os::win32::_os_thread_limit = 0;
3600 volatile intx os::win32::_os_thread_count = 0;
3601
3602 bool os::win32::_is_nt = false;
3603 bool os::win32::_is_windows_2003 = false;
3604 bool os::win32::_is_windows_server = false;
3605
3606 void os::win32::initialize_system_info() {
3607 SYSTEM_INFO si;
3608 GetSystemInfo(&si);
3609 _vm_page_size = si.dwPageSize;
3610 _vm_allocation_granularity = si.dwAllocationGranularity;
3611 _processor_type = si.dwProcessorType;
3612 _processor_level = si.wProcessorLevel;
3613 set_processor_count(si.dwNumberOfProcessors);
3614
3615 MEMORYSTATUSEX ms;
3616 ms.dwLength = sizeof(ms);
3617
3618 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3619 // dwMemoryLoad (% of memory in use)
3620 GlobalMemoryStatusEx(&ms);
3621 _physical_memory = ms.ullTotalPhys;
3622
3623 OSVERSIONINFOEX oi;
3624 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3625 GetVersionEx((OSVERSIONINFO*)&oi);
3626 switch(oi.dwPlatformId) {
3627 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3628 case VER_PLATFORM_WIN32_NT:
3629 _is_nt = true;
3630 {
3631 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3632 if (os_vers == 5002) {
3633 _is_windows_2003 = true;
3634 }
3635 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3636 oi.wProductType == VER_NT_SERVER) {
3637 _is_windows_server = true;
3638 }
3639 }
3640 break;
3641 default: fatal("Unknown platform");
3642 }
3643
3644 _default_stack_size = os::current_stack_size();
3645 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3646 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3647 "stack size not a multiple of page size");
3648
3649 initialize_performance_counter();
3650
3651 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3652 // known to deadlock the system, if the VM issues to thread operations with
3653 // a too high frequency, e.g., such as changing the priorities.
3654 // The 6000 seems to work well - no deadlocks has been notices on the test
3655 // programs that we have seen experience this problem.
3656 if (!os::win32::is_nt()) {
3657 StarvationMonitorInterval = 6000;
3658 }
3659 }
3660
3661
3662 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3663 char path[MAX_PATH];
3664 DWORD size;
3665 DWORD pathLen = (DWORD)sizeof(path);
3666 HINSTANCE result = NULL;
3667
3668 // only allow library name without path component
3669 assert(strchr(name, '\\') == NULL, "path not allowed");
3670 assert(strchr(name, ':') == NULL, "path not allowed");
3671 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3672 jio_snprintf(ebuf, ebuflen,
3673 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3674 return NULL;
3675 }
3676
3677 // search system directory
3678 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3679 strcat(path, "\\");
3680 strcat(path, name);
3681 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3682 return result;
3683 }
3684 }
3685
3686 // try Windows directory
3687 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3688 strcat(path, "\\");
3689 strcat(path, name);
3690 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3691 return result;
3692 }
3693 }
3694
3695 jio_snprintf(ebuf, ebuflen,
3696 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3697 return NULL;
3698 }
3699
3700 void os::win32::setmode_streams() {
3701 _setmode(_fileno(stdin), _O_BINARY);
3702 _setmode(_fileno(stdout), _O_BINARY);
3703 _setmode(_fileno(stderr), _O_BINARY);
3704 }
3705
3706
3707 bool os::is_debugger_attached() {
3708 return IsDebuggerPresent() ? true : false;
3709 }
3710
3711
3712 void os::wait_for_keypress_at_exit(void) {
3713 if (PauseAtExit) {
3714 fprintf(stderr, "Press any key to continue...\n");
3715 fgetc(stdin);
3716 }
3717 }
3718
3719
3720 int os::message_box(const char* title, const char* message) {
3721 int result = MessageBox(NULL, message, title,
3722 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3723 return result == IDYES;
3724 }
3725
3726 int os::allocate_thread_local_storage() {
3727 return TlsAlloc();
3728 }
3729
3730
3731 void os::free_thread_local_storage(int index) {
3732 TlsFree(index);
3733 }
3734
3735
3736 void os::thread_local_storage_at_put(int index, void* value) {
3737 TlsSetValue(index, value);
3738 assert(thread_local_storage_at(index) == value, "Just checking");
3739 }
3740
3741
3742 void* os::thread_local_storage_at(int index) {
3743 return TlsGetValue(index);
3744 }
3745
3746
3747 #ifndef PRODUCT
3748 #ifndef _WIN64
3749 // Helpers to check whether NX protection is enabled
3750 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3751 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3752 pex->ExceptionRecord->NumberParameters > 0 &&
3753 pex->ExceptionRecord->ExceptionInformation[0] ==
3754 EXCEPTION_INFO_EXEC_VIOLATION) {
3755 return EXCEPTION_EXECUTE_HANDLER;
3756 }
3757 return EXCEPTION_CONTINUE_SEARCH;
3758 }
3759
3760 void nx_check_protection() {
3761 // If NX is enabled we'll get an exception calling into code on the stack
3762 char code[] = { (char)0xC3 }; // ret
3763 void *code_ptr = (void *)code;
3764 __try {
3765 __asm call code_ptr
3766 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3767 tty->print_raw_cr("NX protection detected.");
3768 }
3769 }
3770 #endif // _WIN64
3771 #endif // PRODUCT
3772
3773 // this is called _before_ the global arguments have been parsed
3774 void os::init(void) {
3775 _initial_pid = _getpid();
3776
3777 init_random(1234567);
3778
3779 win32::initialize_system_info();
3780 win32::setmode_streams();
3781 init_page_sizes((size_t) win32::vm_page_size());
3782
3783 // For better scalability on MP systems (must be called after initialize_system_info)
3784 #ifndef PRODUCT
3785 if (is_MP()) {
3786 NoYieldsInMicrolock = true;
3787 }
3788 #endif
3789 // This may be overridden later when argument processing is done.
3790 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3791 os::win32::is_windows_2003());
3792
3793 // Initialize main_process and main_thread
3794 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3795 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3796 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3797 fatal("DuplicateHandle failed\n");
3798 }
3799 main_thread_id = (int) GetCurrentThreadId();
3800 }
3801
3802 // To install functions for atexit processing
3803 extern "C" {
3804 static void perfMemory_exit_helper() {
3805 perfMemory_exit();
3806 }
3807 }
3808
3809 static jint initSock();
3810
3811 // this is called _after_ the global arguments have been parsed
3812 jint os::init_2(void) {
3813 // Allocate a single page and mark it as readable for safepoint polling
3814 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3815 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3816
3817 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3818 guarantee( return_page != NULL, "Commit Failed for polling page");
3819
3820 os::set_polling_page( polling_page );
3821
3822 #ifndef PRODUCT
3823 if( Verbose && PrintMiscellaneous )
3824 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3825 #endif
3826
3827 if (!UseMembar) {
3828 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3829 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3830
3831 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3832 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3833
3834 os::set_memory_serialize_page( mem_serialize_page );
3835
3836 #ifndef PRODUCT
3837 if(Verbose && PrintMiscellaneous)
3838 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3839 #endif
3840 }
3841
3842 // Setup Windows Exceptions
3843
3844 // for debugging float code generation bugs
3845 if (ForceFloatExceptions) {
3846 #ifndef _WIN64
3847 static long fp_control_word = 0;
3848 __asm { fstcw fp_control_word }
3849 // see Intel PPro Manual, Vol. 2, p 7-16
3850 const long precision = 0x20;
3851 const long underflow = 0x10;
3852 const long overflow = 0x08;
3853 const long zero_div = 0x04;
3854 const long denorm = 0x02;
3855 const long invalid = 0x01;
3856 fp_control_word |= invalid;
3857 __asm { fldcw fp_control_word }
3858 #endif
3859 }
3860
3861 // If stack_commit_size is 0, windows will reserve the default size,
3862 // but only commit a small portion of it.
3863 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3864 size_t default_reserve_size = os::win32::default_stack_size();
3865 size_t actual_reserve_size = stack_commit_size;
3866 if (stack_commit_size < default_reserve_size) {
3867 // If stack_commit_size == 0, we want this too
3868 actual_reserve_size = default_reserve_size;
3869 }
3870
3871 // Check minimum allowable stack size for thread creation and to initialize
3872 // the java system classes, including StackOverflowError - depends on page
3873 // size. Add a page for compiler2 recursion in main thread.
3874 // Add in 2*BytesPerWord times page size to account for VM stack during
3875 // class initialization depending on 32 or 64 bit VM.
3876 size_t min_stack_allowed =
3877 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3878 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3879 if (actual_reserve_size < min_stack_allowed) {
3880 tty->print_cr("\nThe stack size specified is too small, "
3881 "Specify at least %dk",
3882 min_stack_allowed / K);
3883 return JNI_ERR;
3884 }
3885
3886 JavaThread::set_stack_size_at_create(stack_commit_size);
3887
3888 // Calculate theoretical max. size of Threads to guard gainst artifical
3889 // out-of-memory situations, where all available address-space has been
3890 // reserved by thread stacks.
3891 assert(actual_reserve_size != 0, "Must have a stack");
3892
3893 // Calculate the thread limit when we should start doing Virtual Memory
3894 // banging. Currently when the threads will have used all but 200Mb of space.
3895 //
3896 // TODO: consider performing a similar calculation for commit size instead
3897 // as reserve size, since on a 64-bit platform we'll run into that more
3898 // often than running out of virtual memory space. We can use the
3899 // lower value of the two calculations as the os_thread_limit.
3900 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3901 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3902
3903 // at exit methods are called in the reverse order of their registration.
3904 // there is no limit to the number of functions registered. atexit does
3905 // not set errno.
3906
3907 if (PerfAllowAtExitRegistration) {
3908 // only register atexit functions if PerfAllowAtExitRegistration is set.
3909 // atexit functions can be delayed until process exit time, which
3910 // can be problematic for embedded VM situations. Embedded VMs should
3911 // call DestroyJavaVM() to assure that VM resources are released.
3912
3913 // note: perfMemory_exit_helper atexit function may be removed in
3914 // the future if the appropriate cleanup code can be added to the
3915 // VM_Exit VMOperation's doit method.
3916 if (atexit(perfMemory_exit_helper) != 0) {
3917 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3918 }
3919 }
3920
3921 #ifndef _WIN64
3922 // Print something if NX is enabled (win32 on AMD64)
3923 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3924 #endif
3925
3926 // initialize thread priority policy
3927 prio_init();
3928
3929 if (UseNUMA && !ForceNUMA) {
3930 UseNUMA = false; // We don't fully support this yet
3931 }
3932
3933 if (UseNUMAInterleaving) {
3934 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3935 bool success = numa_interleaving_init();
3936 if (!success) UseNUMAInterleaving = false;
3937 }
3938
3939 if (initSock() != JNI_OK) {
3940 return JNI_ERR;
3941 }
3942
3943 return JNI_OK;
3944 }
3945
3946 void os::init_3(void) {
3947 return;
3948 }
3949
3950 // Mark the polling page as unreadable
3951 void os::make_polling_page_unreadable(void) {
3952 DWORD old_status;
3953 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3954 fatal("Could not disable polling page");
3955 };
3956
3957 // Mark the polling page as readable
3958 void os::make_polling_page_readable(void) {
3959 DWORD old_status;
3960 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3961 fatal("Could not enable polling page");
3962 };
3963
3964
3965 int os::stat(const char *path, struct stat *sbuf) {
3966 char pathbuf[MAX_PATH];
3967 if (strlen(path) > MAX_PATH - 1) {
3968 errno = ENAMETOOLONG;
3969 return -1;
3970 }
3971 os::native_path(strcpy(pathbuf, path));
3972 int ret = ::stat(pathbuf, sbuf);
3973 if (sbuf != NULL && UseUTCFileTimestamp) {
3974 // Fix for 6539723. st_mtime returned from stat() is dependent on
3975 // the system timezone and so can return different values for the
3976 // same file if/when daylight savings time changes. This adjustment
3977 // makes sure the same timestamp is returned regardless of the TZ.
3978 //
3979 // See:
3980 // http://msdn.microsoft.com/library/
3981 // default.asp?url=/library/en-us/sysinfo/base/
3982 // time_zone_information_str.asp
3983 // and
3984 // http://msdn.microsoft.com/library/default.asp?url=
3985 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3986 //
3987 // NOTE: there is a insidious bug here: If the timezone is changed
3988 // after the call to stat() but before 'GetTimeZoneInformation()', then
3989 // the adjustment we do here will be wrong and we'll return the wrong
3990 // value (which will likely end up creating an invalid class data
3991 // archive). Absent a better API for this, or some time zone locking
3992 // mechanism, we'll have to live with this risk.
3993 TIME_ZONE_INFORMATION tz;
3994 DWORD tzid = GetTimeZoneInformation(&tz);
3995 int daylightBias =
3996 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3997 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3998 }
3999 return ret;
4000 }
4001
4002
4003 #define FT2INT64(ft) \
4004 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4005
4006
4007 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4008 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4009 // of a thread.
4010 //
4011 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4012 // the fast estimate available on the platform.
4013
4014 // current_thread_cpu_time() is not optimized for Windows yet
4015 jlong os::current_thread_cpu_time() {
4016 // return user + sys since the cost is the same
4017 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4018 }
4019
4020 jlong os::thread_cpu_time(Thread* thread) {
4021 // consistent with what current_thread_cpu_time() returns.
4022 return os::thread_cpu_time(thread, true /* user+sys */);
4023 }
4024
4025 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4026 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4027 }
4028
4029 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4030 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4031 // If this function changes, os::is_thread_cpu_time_supported() should too
4032 if (os::win32::is_nt()) {
4033 FILETIME CreationTime;
4034 FILETIME ExitTime;
4035 FILETIME KernelTime;
4036 FILETIME UserTime;
4037
4038 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4039 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4040 return -1;
4041 else
4042 if (user_sys_cpu_time) {
4043 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4044 } else {
4045 return FT2INT64(UserTime) * 100;
4046 }
4047 } else {
4048 return (jlong) timeGetTime() * 1000000;
4049 }
4050 }
4051
4052 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4053 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4054 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4055 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4056 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4057 }
4058
4059 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4060 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4061 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4062 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4063 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4064 }
4065
4066 bool os::is_thread_cpu_time_supported() {
4067 // see os::thread_cpu_time
4068 if (os::win32::is_nt()) {
4069 FILETIME CreationTime;
4070 FILETIME ExitTime;
4071 FILETIME KernelTime;
4072 FILETIME UserTime;
4073
4074 if ( GetThreadTimes(GetCurrentThread(),
4075 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4076 return false;
4077 else
4078 return true;
4079 } else {
4080 return false;
4081 }
4082 }
4083
4084 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4085 // It does have primitives (PDH API) to get CPU usage and run queue length.
4086 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4087 // If we wanted to implement loadavg on Windows, we have a few options:
4088 //
4089 // a) Query CPU usage and run queue length and "fake" an answer by
4090 // returning the CPU usage if it's under 100%, and the run queue
4091 // length otherwise. It turns out that querying is pretty slow
4092 // on Windows, on the order of 200 microseconds on a fast machine.
4093 // Note that on the Windows the CPU usage value is the % usage
4094 // since the last time the API was called (and the first call
4095 // returns 100%), so we'd have to deal with that as well.
4096 //
4097 // b) Sample the "fake" answer using a sampling thread and store
4098 // the answer in a global variable. The call to loadavg would
4099 // just return the value of the global, avoiding the slow query.
4100 //
4101 // c) Sample a better answer using exponential decay to smooth the
4102 // value. This is basically the algorithm used by UNIX kernels.
4103 //
4104 // Note that sampling thread starvation could affect both (b) and (c).
4105 int os::loadavg(double loadavg[], int nelem) {
4106 return -1;
4107 }
4108
4109
4110 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4111 bool os::dont_yield() {
4112 return DontYieldALot;
4113 }
4114
4115 // This method is a slightly reworked copy of JDK's sysOpen
4116 // from src/windows/hpi/src/sys_api_md.c
4117
4118 int os::open(const char *path, int oflag, int mode) {
4119 char pathbuf[MAX_PATH];
4120
4121 if (strlen(path) > MAX_PATH - 1) {
4122 errno = ENAMETOOLONG;
4123 return -1;
4124 }
4125 os::native_path(strcpy(pathbuf, path));
4126 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4127 }
4128
4129 FILE* os::open(int fd, const char* mode) {
4130 return ::_fdopen(fd, mode);
4131 }
4132
4133 // Is a (classpath) directory empty?
4134 bool os::dir_is_empty(const char* path) {
4135 WIN32_FIND_DATA fd;
4136 HANDLE f = FindFirstFile(path, &fd);
4137 if (f == INVALID_HANDLE_VALUE) {
4138 return true;
4139 }
4140 FindClose(f);
4141 return false;
4142 }
4143
4144 // create binary file, rewriting existing file if required
4145 int os::create_binary_file(const char* path, bool rewrite_existing) {
4146 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4147 if (!rewrite_existing) {
4148 oflags |= _O_EXCL;
4149 }
4150 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4151 }
4152
4153 // return current position of file pointer
4154 jlong os::current_file_offset(int fd) {
4155 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4156 }
4157
4158 // move file pointer to the specified offset
4159 jlong os::seek_to_file_offset(int fd, jlong offset) {
4160 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4161 }
4162
4163
4164 jlong os::lseek(int fd, jlong offset, int whence) {
4165 return (jlong) ::_lseeki64(fd, offset, whence);
4166 }
4167
4168 // This method is a slightly reworked copy of JDK's sysNativePath
4169 // from src/windows/hpi/src/path_md.c
4170
4171 /* Convert a pathname to native format. On win32, this involves forcing all
4172 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4173 sometimes rejects '/') and removing redundant separators. The input path is
4174 assumed to have been converted into the character encoding used by the local
4175 system. Because this might be a double-byte encoding, care is taken to
4176 treat double-byte lead characters correctly.
4177
4178 This procedure modifies the given path in place, as the result is never
4179 longer than the original. There is no error return; this operation always
4180 succeeds. */
4181 char * os::native_path(char *path) {
4182 char *src = path, *dst = path, *end = path;
4183 char *colon = NULL; /* If a drive specifier is found, this will
4184 point to the colon following the drive
4185 letter */
4186
4187 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4188 assert(((!::IsDBCSLeadByte('/'))
4189 && (!::IsDBCSLeadByte('\\'))
4190 && (!::IsDBCSLeadByte(':'))),
4191 "Illegal lead byte");
4192
4193 /* Check for leading separators */
4194 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4195 while (isfilesep(*src)) {
4196 src++;
4197 }
4198
4199 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4200 /* Remove leading separators if followed by drive specifier. This
4201 hack is necessary to support file URLs containing drive
4202 specifiers (e.g., "file://c:/path"). As a side effect,
4203 "/c:/path" can be used as an alternative to "c:/path". */
4204 *dst++ = *src++;
4205 colon = dst;
4206 *dst++ = ':';
4207 src++;
4208 } else {
4209 src = path;
4210 if (isfilesep(src[0]) && isfilesep(src[1])) {
4211 /* UNC pathname: Retain first separator; leave src pointed at
4212 second separator so that further separators will be collapsed
4213 into the second separator. The result will be a pathname
4214 beginning with "\\\\" followed (most likely) by a host name. */
4215 src = dst = path + 1;
4216 path[0] = '\\'; /* Force first separator to '\\' */
4217 }
4218 }
4219
4220 end = dst;
4221
4222 /* Remove redundant separators from remainder of path, forcing all
4223 separators to be '\\' rather than '/'. Also, single byte space
4224 characters are removed from the end of the path because those
4225 are not legal ending characters on this operating system.
4226 */
4227 while (*src != '\0') {
4228 if (isfilesep(*src)) {
4229 *dst++ = '\\'; src++;
4230 while (isfilesep(*src)) src++;
4231 if (*src == '\0') {
4232 /* Check for trailing separator */
4233 end = dst;
4234 if (colon == dst - 2) break; /* "z:\\" */
4235 if (dst == path + 1) break; /* "\\" */
4236 if (dst == path + 2 && isfilesep(path[0])) {
4237 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4238 beginning of a UNC pathname. Even though it is not, by
4239 itself, a valid UNC pathname, we leave it as is in order
4240 to be consistent with the path canonicalizer as well
4241 as the win32 APIs, which treat this case as an invalid
4242 UNC pathname rather than as an alias for the root
4243 directory of the current drive. */
4244 break;
4245 }
4246 end = --dst; /* Path does not denote a root directory, so
4247 remove trailing separator */
4248 break;
4249 }
4250 end = dst;
4251 } else {
4252 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4253 *dst++ = *src++;
4254 if (*src) *dst++ = *src++;
4255 end = dst;
4256 } else { /* Copy a single-byte character */
4257 char c = *src++;
4258 *dst++ = c;
4259 /* Space is not a legal ending character */
4260 if (c != ' ') end = dst;
4261 }
4262 }
4263 }
4264
4265 *end = '\0';
4266
4267 /* For "z:", add "." to work around a bug in the C runtime library */
4268 if (colon == dst - 1) {
4269 path[2] = '.';
4270 path[3] = '\0';
4271 }
4272
4273 return path;
4274 }
4275
4276 // This code is a copy of JDK's sysSetLength
4277 // from src/windows/hpi/src/sys_api_md.c
4278
4279 int os::ftruncate(int fd, jlong length) {
4280 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4281 long high = (long)(length >> 32);
4282 DWORD ret;
4283
4284 if (h == (HANDLE)(-1)) {
4285 return -1;
4286 }
4287
4288 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4289 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4290 return -1;
4291 }
4292
4293 if (::SetEndOfFile(h) == FALSE) {
4294 return -1;
4295 }
4296
4297 return 0;
4298 }
4299
4300
4301 // This code is a copy of JDK's sysSync
4302 // from src/windows/hpi/src/sys_api_md.c
4303 // except for the legacy workaround for a bug in Win 98
4304
4305 int os::fsync(int fd) {
4306 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4307
4308 if ( (!::FlushFileBuffers(handle)) &&
4309 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4310 /* from winerror.h */
4311 return -1;
4312 }
4313 return 0;
4314 }
4315
4316 static int nonSeekAvailable(int, long *);
4317 static int stdinAvailable(int, long *);
4318
4319 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4320 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4321
4322 // This code is a copy of JDK's sysAvailable
4323 // from src/windows/hpi/src/sys_api_md.c
4324
4325 int os::available(int fd, jlong *bytes) {
4326 jlong cur, end;
4327 struct _stati64 stbuf64;
4328
4329 if (::_fstati64(fd, &stbuf64) >= 0) {
4330 int mode = stbuf64.st_mode;
4331 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4332 int ret;
4333 long lpbytes;
4334 if (fd == 0) {
4335 ret = stdinAvailable(fd, &lpbytes);
4336 } else {
4337 ret = nonSeekAvailable(fd, &lpbytes);
4338 }
4339 (*bytes) = (jlong)(lpbytes);
4340 return ret;
4341 }
4342 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4343 return FALSE;
4344 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4345 return FALSE;
4346 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4347 return FALSE;
4348 }
4349 *bytes = end - cur;
4350 return TRUE;
4351 } else {
4352 return FALSE;
4353 }
4354 }
4355
4356 // This code is a copy of JDK's nonSeekAvailable
4357 // from src/windows/hpi/src/sys_api_md.c
4358
4359 static int nonSeekAvailable(int fd, long *pbytes) {
4360 /* This is used for available on non-seekable devices
4361 * (like both named and anonymous pipes, such as pipes
4362 * connected to an exec'd process).
4363 * Standard Input is a special case.
4364 *
4365 */
4366 HANDLE han;
4367
4368 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4369 return FALSE;
4370 }
4371
4372 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4373 /* PeekNamedPipe fails when at EOF. In that case we
4374 * simply make *pbytes = 0 which is consistent with the
4375 * behavior we get on Solaris when an fd is at EOF.
4376 * The only alternative is to raise an Exception,
4377 * which isn't really warranted.
4378 */
4379 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4380 return FALSE;
4381 }
4382 *pbytes = 0;
4383 }
4384 return TRUE;
4385 }
4386
4387 #define MAX_INPUT_EVENTS 2000
4388
4389 // This code is a copy of JDK's stdinAvailable
4390 // from src/windows/hpi/src/sys_api_md.c
4391
4392 static int stdinAvailable(int fd, long *pbytes) {
4393 HANDLE han;
4394 DWORD numEventsRead = 0; /* Number of events read from buffer */
4395 DWORD numEvents = 0; /* Number of events in buffer */
4396 DWORD i = 0; /* Loop index */
4397 DWORD curLength = 0; /* Position marker */
4398 DWORD actualLength = 0; /* Number of bytes readable */
4399 BOOL error = FALSE; /* Error holder */
4400 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4401
4402 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4403 return FALSE;
4404 }
4405
4406 /* Construct an array of input records in the console buffer */
4407 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4408 if (error == 0) {
4409 return nonSeekAvailable(fd, pbytes);
4410 }
4411
4412 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4413 if (numEvents > MAX_INPUT_EVENTS) {
4414 numEvents = MAX_INPUT_EVENTS;
4415 }
4416
4417 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4418 if (lpBuffer == NULL) {
4419 return FALSE;
4420 }
4421
4422 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4423 if (error == 0) {
4424 os::free(lpBuffer, mtInternal);
4425 return FALSE;
4426 }
4427
4428 /* Examine input records for the number of bytes available */
4429 for(i=0; i<numEvents; i++) {
4430 if (lpBuffer[i].EventType == KEY_EVENT) {
4431
4432 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4433 &(lpBuffer[i].Event);
4434 if (keyRecord->bKeyDown == TRUE) {
4435 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4436 curLength++;
4437 if (*keyPressed == '\r') {
4438 actualLength = curLength;
4439 }
4440 }
4441 }
4442 }
4443
4444 if(lpBuffer != NULL) {
4445 os::free(lpBuffer, mtInternal);
4446 }
4447
4448 *pbytes = (long) actualLength;
4449 return TRUE;
4450 }
4451
4452 // Map a block of memory.
4453 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4454 char *addr, size_t bytes, bool read_only,
4455 bool allow_exec) {
4456 HANDLE hFile;
4457 char* base;
4458
4459 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4460 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4461 if (hFile == NULL) {
4462 if (PrintMiscellaneous && Verbose) {
4463 DWORD err = GetLastError();
4464 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4465 }
4466 return NULL;
4467 }
4468
4469 if (allow_exec) {
4470 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4471 // unless it comes from a PE image (which the shared archive is not.)
4472 // Even VirtualProtect refuses to give execute access to mapped memory
4473 // that was not previously executable.
4474 //
4475 // Instead, stick the executable region in anonymous memory. Yuck.
4476 // Penalty is that ~4 pages will not be shareable - in the future
4477 // we might consider DLLizing the shared archive with a proper PE
4478 // header so that mapping executable + sharing is possible.
4479
4480 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4481 PAGE_READWRITE);
4482 if (base == NULL) {
4483 if (PrintMiscellaneous && Verbose) {
4484 DWORD err = GetLastError();
4485 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4486 }
4487 CloseHandle(hFile);
4488 return NULL;
4489 }
4490
4491 DWORD bytes_read;
4492 OVERLAPPED overlapped;
4493 overlapped.Offset = (DWORD)file_offset;
4494 overlapped.OffsetHigh = 0;
4495 overlapped.hEvent = NULL;
4496 // ReadFile guarantees that if the return value is true, the requested
4497 // number of bytes were read before returning.
4498 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4499 if (!res) {
4500 if (PrintMiscellaneous && Verbose) {
4501 DWORD err = GetLastError();
4502 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4503 }
4504 release_memory(base, bytes);
4505 CloseHandle(hFile);
4506 return NULL;
4507 }
4508 } else {
4509 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4510 NULL /*file_name*/);
4511 if (hMap == NULL) {
4512 if (PrintMiscellaneous && Verbose) {
4513 DWORD err = GetLastError();
4514 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4515 }
4516 CloseHandle(hFile);
4517 return NULL;
4518 }
4519
4520 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4521 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4522 (DWORD)bytes, addr);
4523 if (base == NULL) {
4524 if (PrintMiscellaneous && Verbose) {
4525 DWORD err = GetLastError();
4526 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4527 }
4528 CloseHandle(hMap);
4529 CloseHandle(hFile);
4530 return NULL;
4531 }
4532
4533 if (CloseHandle(hMap) == 0) {
4534 if (PrintMiscellaneous && Verbose) {
4535 DWORD err = GetLastError();
4536 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4537 }
4538 CloseHandle(hFile);
4539 return base;
4540 }
4541 }
4542
4543 if (allow_exec) {
4544 DWORD old_protect;
4545 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4546 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4547
4548 if (!res) {
4549 if (PrintMiscellaneous && Verbose) {
4550 DWORD err = GetLastError();
4551 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4552 }
4553 // Don't consider this a hard error, on IA32 even if the
4554 // VirtualProtect fails, we should still be able to execute
4555 CloseHandle(hFile);
4556 return base;
4557 }
4558 }
4559
4560 if (CloseHandle(hFile) == 0) {
4561 if (PrintMiscellaneous && Verbose) {
4562 DWORD err = GetLastError();
4563 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4564 }
4565 return base;
4566 }
4567
4568 return base;
4569 }
4570
4571
4572 // Remap a block of memory.
4573 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4574 char *addr, size_t bytes, bool read_only,
4575 bool allow_exec) {
4576 // This OS does not allow existing memory maps to be remapped so we
4577 // have to unmap the memory before we remap it.
4578 if (!os::unmap_memory(addr, bytes)) {
4579 return NULL;
4580 }
4581
4582 // There is a very small theoretical window between the unmap_memory()
4583 // call above and the map_memory() call below where a thread in native
4584 // code may be able to access an address that is no longer mapped.
4585
4586 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4587 read_only, allow_exec);
4588 }
4589
4590
4591 // Unmap a block of memory.
4592 // Returns true=success, otherwise false.
4593
4594 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4595 BOOL result = UnmapViewOfFile(addr);
4596 if (result == 0) {
4597 if (PrintMiscellaneous && Verbose) {
4598 DWORD err = GetLastError();
4599 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4600 }
4601 return false;
4602 }
4603 return true;
4604 }
4605
4606 void os::pause() {
4607 char filename[MAX_PATH];
4608 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4609 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4610 } else {
4611 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4612 }
4613
4614 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4615 if (fd != -1) {
4616 struct stat buf;
4617 ::close(fd);
4618 while (::stat(filename, &buf) == 0) {
4619 Sleep(100);
4620 }
4621 } else {
4622 jio_fprintf(stderr,
4623 "Could not open pause file '%s', continuing immediately.\n", filename);
4624 }
4625 }
4626
4627 // An Event wraps a win32 "CreateEvent" kernel handle.
4628 //
4629 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4630 //
4631 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4632 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4633 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4634 // In addition, an unpark() operation might fetch the handle field, but the
4635 // event could recycle between the fetch and the SetEvent() operation.
4636 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4637 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4638 // on an stale but recycled handle would be harmless, but in practice this might
4639 // confuse other non-Sun code, so it's not a viable approach.
4640 //
4641 // 2: Once a win32 event handle is associated with an Event, it remains associated
4642 // with the Event. The event handle is never closed. This could be construed
4643 // as handle leakage, but only up to the maximum # of threads that have been extant
4644 // at any one time. This shouldn't be an issue, as windows platforms typically
4645 // permit a process to have hundreds of thousands of open handles.
4646 //
4647 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4648 // and release unused handles.
4649 //
4650 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4651 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4652 //
4653 // 5. Use an RCU-like mechanism (Read-Copy Update).
4654 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4655 //
4656 // We use (2).
4657 //
4658 // TODO-FIXME:
4659 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4660 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4661 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4662 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4663 // into a single win32 CreateEvent() handle.
4664 //
4665 // _Event transitions in park()
4666 // -1 => -1 : illegal
4667 // 1 => 0 : pass - return immediately
4668 // 0 => -1 : block
4669 //
4670 // _Event serves as a restricted-range semaphore :
4671 // -1 : thread is blocked
4672 // 0 : neutral - thread is running or ready
4673 // 1 : signaled - thread is running or ready
4674 //
4675 // Another possible encoding of _Event would be
4676 // with explicit "PARKED" and "SIGNALED" bits.
4677
4678 int os::PlatformEvent::park (jlong Millis) {
4679 guarantee (_ParkHandle != NULL , "Invariant") ;
4680 guarantee (Millis > 0 , "Invariant") ;
4681 int v ;
4682
4683 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4684 // the initial park() operation.
4685
4686 for (;;) {
4687 v = _Event ;
4688 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4689 }
4690 guarantee ((v == 0) || (v == 1), "invariant") ;
4691 if (v != 0) return OS_OK ;
4692
4693 // Do this the hard way by blocking ...
4694 // TODO: consider a brief spin here, gated on the success of recent
4695 // spin attempts by this thread.
4696 //
4697 // We decompose long timeouts into series of shorter timed waits.
4698 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4699 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4700 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4701 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4702 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4703 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4704 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4705 // for the already waited time. This policy does not admit any new outcomes.
4706 // In the future, however, we might want to track the accumulated wait time and
4707 // adjust Millis accordingly if we encounter a spurious wakeup.
4708
4709 const int MAXTIMEOUT = 0x10000000 ;
4710 DWORD rv = WAIT_TIMEOUT ;
4711 while (_Event < 0 && Millis > 0) {
4712 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4713 if (Millis > MAXTIMEOUT) {
4714 prd = MAXTIMEOUT ;
4715 }
4716 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4717 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4718 if (rv == WAIT_TIMEOUT) {
4719 Millis -= prd ;
4720 }
4721 }
4722 v = _Event ;
4723 _Event = 0 ;
4724 // see comment at end of os::PlatformEvent::park() below:
4725 OrderAccess::fence() ;
4726 // If we encounter a nearly simultanous timeout expiry and unpark()
4727 // we return OS_OK indicating we awoke via unpark().
4728 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4729 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4730 }
4731
4732 void os::PlatformEvent::park () {
4733 guarantee (_ParkHandle != NULL, "Invariant") ;
4734 // Invariant: Only the thread associated with the Event/PlatformEvent
4735 // may call park().
4736 int v ;
4737 for (;;) {
4738 v = _Event ;
4739 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4740 }
4741 guarantee ((v == 0) || (v == 1), "invariant") ;
4742 if (v != 0) return ;
4743
4744 // Do this the hard way by blocking ...
4745 // TODO: consider a brief spin here, gated on the success of recent
4746 // spin attempts by this thread.
4747 while (_Event < 0) {
4748 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4749 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4750 }
4751
4752 // Usually we'll find _Event == 0 at this point, but as
4753 // an optional optimization we clear it, just in case can
4754 // multiple unpark() operations drove _Event up to 1.
4755 _Event = 0 ;
4756 OrderAccess::fence() ;
4757 guarantee (_Event >= 0, "invariant") ;
4758 }
4759
4760 void os::PlatformEvent::unpark() {
4761 guarantee (_ParkHandle != NULL, "Invariant") ;
4762
4763 // Transitions for _Event:
4764 // 0 :=> 1
4765 // 1 :=> 1
4766 // -1 :=> either 0 or 1; must signal target thread
4767 // That is, we can safely transition _Event from -1 to either
4768 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4769 // unpark() calls.
4770 // See also: "Semaphores in Plan 9" by Mullender & Cox
4771 //
4772 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4773 // that it will take two back-to-back park() calls for the owning
4774 // thread to block. This has the benefit of forcing a spurious return
4775 // from the first park() call after an unpark() call which will help
4776 // shake out uses of park() and unpark() without condition variables.
4777
4778 if (Atomic::xchg(1, &_Event) >= 0) return;
4779
4780 ::SetEvent(_ParkHandle);
4781 }
4782
4783
4784 // JSR166
4785 // -------------------------------------------------------
4786
4787 /*
4788 * The Windows implementation of Park is very straightforward: Basic
4789 * operations on Win32 Events turn out to have the right semantics to
4790 * use them directly. We opportunistically resuse the event inherited
4791 * from Monitor.
4792 */
4793
4794
4795 void Parker::park(bool isAbsolute, jlong time) {
4796 guarantee (_ParkEvent != NULL, "invariant") ;
4797 // First, demultiplex/decode time arguments
4798 if (time < 0) { // don't wait
4799 return;
4800 }
4801 else if (time == 0 && !isAbsolute) {
4802 time = INFINITE;
4803 }
4804 else if (isAbsolute) {
4805 time -= os::javaTimeMillis(); // convert to relative time
4806 if (time <= 0) // already elapsed
4807 return;
4808 }
4809 else { // relative
4810 time /= 1000000; // Must coarsen from nanos to millis
4811 if (time == 0) // Wait for the minimal time unit if zero
4812 time = 1;
4813 }
4814
4815 JavaThread* thread = (JavaThread*)(Thread::current());
4816 assert(thread->is_Java_thread(), "Must be JavaThread");
4817 JavaThread *jt = (JavaThread *)thread;
4818
4819 // Don't wait if interrupted or already triggered
4820 if (Thread::is_interrupted(thread, false) ||
4821 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4822 ResetEvent(_ParkEvent);
4823 return;
4824 }
4825 else {
4826 ThreadBlockInVM tbivm(jt);
4827 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4828 jt->set_suspend_equivalent();
4829
4830 WaitForSingleObject(_ParkEvent, time);
4831 ResetEvent(_ParkEvent);
4832
4833 // If externally suspended while waiting, re-suspend
4834 if (jt->handle_special_suspend_equivalent_condition()) {
4835 jt->java_suspend_self();
4836 }
4837 }
4838 }
4839
4840 void Parker::unpark() {
4841 guarantee (_ParkEvent != NULL, "invariant") ;
4842 SetEvent(_ParkEvent);
4843 }
4844
4845 // Run the specified command in a separate process. Return its exit value,
4846 // or -1 on failure (e.g. can't create a new process).
4847 int os::fork_and_exec(char* cmd) {
4848 STARTUPINFO si;
4849 PROCESS_INFORMATION pi;
4850
4851 memset(&si, 0, sizeof(si));
4852 si.cb = sizeof(si);
4853 memset(&pi, 0, sizeof(pi));
4854 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4855 cmd, // command line
4856 NULL, // process security attribute
4857 NULL, // thread security attribute
4858 TRUE, // inherits system handles
4859 0, // no creation flags
4860 NULL, // use parent's environment block
4861 NULL, // use parent's starting directory
4862 &si, // (in) startup information
4863 &pi); // (out) process information
4864
4865 if (rslt) {
4866 // Wait until child process exits.
4867 WaitForSingleObject(pi.hProcess, INFINITE);
4868
4869 DWORD exit_code;
4870 GetExitCodeProcess(pi.hProcess, &exit_code);
4871
4872 // Close process and thread handles.
4873 CloseHandle(pi.hProcess);
4874 CloseHandle(pi.hThread);
4875
4876 return (int)exit_code;
4877 } else {
4878 return -1;
4879 }
4880 }
4881
4882 //--------------------------------------------------------------------------------------------------
4883 // Non-product code
4884
4885 static int mallocDebugIntervalCounter = 0;
4886 static int mallocDebugCounter = 0;
4887 bool os::check_heap(bool force) {
4888 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4889 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4890 // Note: HeapValidate executes two hardware breakpoints when it finds something
4891 // wrong; at these points, eax contains the address of the offending block (I think).
4892 // To get to the exlicit error message(s) below, just continue twice.
4893 HANDLE heap = GetProcessHeap();
4894 { HeapLock(heap);
4895 PROCESS_HEAP_ENTRY phe;
4896 phe.lpData = NULL;
4897 while (HeapWalk(heap, &phe) != 0) {
4898 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4899 !HeapValidate(heap, 0, phe.lpData)) {
4900 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4901 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4902 fatal("corrupted C heap");
4903 }
4904 }
4905 DWORD err = GetLastError();
4906 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4907 fatal(err_msg("heap walk aborted with error %d", err));
4908 }
4909 HeapUnlock(heap);
4910 }
4911 mallocDebugIntervalCounter = 0;
4912 }
4913 return true;
4914 }
4915
4916
4917 bool os::find(address addr, outputStream* st) {
4918 // Nothing yet
4919 return false;
4920 }
4921
4922 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4923 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4924
4925 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4926 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4927 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4928 address addr = (address) exceptionRecord->ExceptionInformation[1];
4929
4930 if (os::is_memory_serialize_page(thread, addr))
4931 return EXCEPTION_CONTINUE_EXECUTION;
4932 }
4933
4934 return EXCEPTION_CONTINUE_SEARCH;
4935 }
4936
4937 // We don't build a headless jre for Windows
4938 bool os::is_headless_jre() { return false; }
4939
4940 static jint initSock() {
4941 WSADATA wsadata;
4942
4943 if (!os::WinSock2Dll::WinSock2Available()) {
4944 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
4945 ::GetLastError());
4946 return JNI_ERR;
4947 }
4948
4949 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
4950 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
4951 ::GetLastError());
4952 return JNI_ERR;
4953 }
4954 return JNI_OK;
4955 }
4956
4957 struct hostent* os::get_host_by_name(char* name) {
4958 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4959 }
4960
4961 int os::socket_close(int fd) {
4962 return ::closesocket(fd);
4963 }
4964
4965 int os::socket_available(int fd, jint *pbytes) {
4966 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4967 return (ret < 0) ? 0 : 1;
4968 }
4969
4970 int os::socket(int domain, int type, int protocol) {
4971 return ::socket(domain, type, protocol);
4972 }
4973
4974 int os::listen(int fd, int count) {
4975 return ::listen(fd, count);
4976 }
4977
4978 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4979 return ::connect(fd, him, len);
4980 }
4981
4982 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4983 return ::accept(fd, him, len);
4984 }
4985
4986 int os::sendto(int fd, char* buf, size_t len, uint flags,
4987 struct sockaddr* to, socklen_t tolen) {
4988
4989 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4990 }
4991
4992 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4993 sockaddr* from, socklen_t* fromlen) {
4994
4995 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4996 }
4997
4998 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4999 return ::recv(fd, buf, (int)nBytes, flags);
5000 }
5001
5002 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5003 return ::send(fd, buf, (int)nBytes, flags);
5004 }
5005
5006 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5007 return ::send(fd, buf, (int)nBytes, flags);
5008 }
5009
5010 int os::timeout(int fd, long timeout) {
5011 fd_set tbl;
5012 struct timeval t;
5013
5014 t.tv_sec = timeout / 1000;
5015 t.tv_usec = (timeout % 1000) * 1000;
5016
5017 tbl.fd_count = 1;
5018 tbl.fd_array[0] = fd;
5019
5020 return ::select(1, &tbl, 0, 0, &t);
5021 }
5022
5023 int os::get_host_name(char* name, int namelen) {
5024 return ::gethostname(name, namelen);
5025 }
5026
5027 int os::socket_shutdown(int fd, int howto) {
5028 return ::shutdown(fd, howto);
5029 }
5030
5031 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5032 return ::bind(fd, him, len);
5033 }
5034
5035 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5036 return ::getsockname(fd, him, len);
5037 }
5038
5039 int os::get_sock_opt(int fd, int level, int optname,
5040 char* optval, socklen_t* optlen) {
5041 return ::getsockopt(fd, level, optname, optval, optlen);
5042 }
5043
5044 int os::set_sock_opt(int fd, int level, int optname,
5045 const char* optval, socklen_t optlen) {
5046 return ::setsockopt(fd, level, optname, optval, optlen);
5047 }
5048
5049
5050 // Kernel32 API
5051 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5052 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5053 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5054 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5055 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5056
5057 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5058 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5059 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5060 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5061 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5062
5063
5064 BOOL os::Kernel32Dll::initialized = FALSE;
5065 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5066 assert(initialized && _GetLargePageMinimum != NULL,
5067 "GetLargePageMinimumAvailable() not yet called");
5068 return _GetLargePageMinimum();
5069 }
5070
5071 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5072 if (!initialized) {
5073 initialize();
5074 }
5075 return _GetLargePageMinimum != NULL;
5076 }
5077
5078 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5079 if (!initialized) {
5080 initialize();
5081 }
5082 return _VirtualAllocExNuma != NULL;
5083 }
5084
5085 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5086 assert(initialized && _VirtualAllocExNuma != NULL,
5087 "NUMACallsAvailable() not yet called");
5088
5089 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5090 }
5091
5092 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5093 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5094 "NUMACallsAvailable() not yet called");
5095
5096 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5097 }
5098
5099 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5100 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5101 "NUMACallsAvailable() not yet called");
5102
5103 return _GetNumaNodeProcessorMask(node, proc_mask);
5104 }
5105
5106 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5107 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5108 if (!initialized) {
5109 initialize();
5110 }
5111
5112 if (_RtlCaptureStackBackTrace != NULL) {
5113 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5114 BackTrace, BackTraceHash);
5115 } else {
5116 return 0;
5117 }
5118 }
5119
5120 void os::Kernel32Dll::initializeCommon() {
5121 if (!initialized) {
5122 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5123 assert(handle != NULL, "Just check");
5124 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5125 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5126 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5127 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5128 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5129 initialized = TRUE;
5130 }
5131 }
5132
5133
5134
5135 #ifndef JDK6_OR_EARLIER
5136
5137 void os::Kernel32Dll::initialize() {
5138 initializeCommon();
5139 }
5140
5141
5142 // Kernel32 API
5143 inline BOOL os::Kernel32Dll::SwitchToThread() {
5144 return ::SwitchToThread();
5145 }
5146
5147 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5148 return true;
5149 }
5150
5151 // Help tools
5152 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5153 return true;
5154 }
5155
5156 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5157 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5158 }
5159
5160 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5161 return ::Module32First(hSnapshot, lpme);
5162 }
5163
5164 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5165 return ::Module32Next(hSnapshot, lpme);
5166 }
5167
5168
5169 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5170 return true;
5171 }
5172
5173 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5174 ::GetNativeSystemInfo(lpSystemInfo);
5175 }
5176
5177 // PSAPI API
5178 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5179 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5180 }
5181
5182 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5183 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5184 }
5185
5186 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5187 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5188 }
5189
5190 inline BOOL os::PSApiDll::PSApiAvailable() {
5191 return true;
5192 }
5193
5194
5195 // WinSock2 API
5196 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5197 return ::WSAStartup(wVersionRequested, lpWSAData);
5198 }
5199
5200 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5201 return ::gethostbyname(name);
5202 }
5203
5204 inline BOOL os::WinSock2Dll::WinSock2Available() {
5205 return true;
5206 }
5207
5208 // Advapi API
5209 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5210 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5211 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5212 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5213 BufferLength, PreviousState, ReturnLength);
5214 }
5215
5216 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5217 PHANDLE TokenHandle) {
5218 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5219 }
5220
5221 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5222 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5223 }
5224
5225 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5226 return true;
5227 }
5228
5229 #else
5230 // Kernel32 API
5231 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5232 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5233 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5234 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5235 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5236
5237 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5238 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5239 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5240 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5241 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5242
5243 void os::Kernel32Dll::initialize() {
5244 if (!initialized) {
5245 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5246 assert(handle != NULL, "Just check");
5247
5248 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5249 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5250 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5251 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5252 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5253 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5254 initializeCommon(); // resolve the functions that always need resolving
5255
5256 initialized = TRUE;
5257 }
5258 }
5259
5260 BOOL os::Kernel32Dll::SwitchToThread() {
5261 assert(initialized && _SwitchToThread != NULL,
5262 "SwitchToThreadAvailable() not yet called");
5263 return _SwitchToThread();
5264 }
5265
5266
5267 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5268 if (!initialized) {
5269 initialize();
5270 }
5271 return _SwitchToThread != NULL;
5272 }
5273
5274 // Help tools
5275 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5276 if (!initialized) {
5277 initialize();
5278 }
5279 return _CreateToolhelp32Snapshot != NULL &&
5280 _Module32First != NULL &&
5281 _Module32Next != NULL;
5282 }
5283
5284 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5285 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5286 "HelpToolsAvailable() not yet called");
5287
5288 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5289 }
5290
5291 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5292 assert(initialized && _Module32First != NULL,
5293 "HelpToolsAvailable() not yet called");
5294
5295 return _Module32First(hSnapshot, lpme);
5296 }
5297
5298 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5299 assert(initialized && _Module32Next != NULL,
5300 "HelpToolsAvailable() not yet called");
5301
5302 return _Module32Next(hSnapshot, lpme);
5303 }
5304
5305
5306 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5307 if (!initialized) {
5308 initialize();
5309 }
5310 return _GetNativeSystemInfo != NULL;
5311 }
5312
5313 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5314 assert(initialized && _GetNativeSystemInfo != NULL,
5315 "GetNativeSystemInfoAvailable() not yet called");
5316
5317 _GetNativeSystemInfo(lpSystemInfo);
5318 }
5319
5320 // PSAPI API
5321
5322
5323 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5324 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5325 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5326
5327 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5328 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5329 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5330 BOOL os::PSApiDll::initialized = FALSE;
5331
5332 void os::PSApiDll::initialize() {
5333 if (!initialized) {
5334 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5335 if (handle != NULL) {
5336 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5337 "EnumProcessModules");
5338 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5339 "GetModuleFileNameExA");
5340 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5341 "GetModuleInformation");
5342 }
5343 initialized = TRUE;
5344 }
5345 }
5346
5347
5348
5349 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5350 assert(initialized && _EnumProcessModules != NULL,
5351 "PSApiAvailable() not yet called");
5352 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5353 }
5354
5355 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5356 assert(initialized && _GetModuleFileNameEx != NULL,
5357 "PSApiAvailable() not yet called");
5358 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5359 }
5360
5361 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5362 assert(initialized && _GetModuleInformation != NULL,
5363 "PSApiAvailable() not yet called");
5364 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5365 }
5366
5367 BOOL os::PSApiDll::PSApiAvailable() {
5368 if (!initialized) {
5369 initialize();
5370 }
5371 return _EnumProcessModules != NULL &&
5372 _GetModuleFileNameEx != NULL &&
5373 _GetModuleInformation != NULL;
5374 }
5375
5376
5377 // WinSock2 API
5378 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5379 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5380
5381 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5382 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5383 BOOL os::WinSock2Dll::initialized = FALSE;
5384
5385 void os::WinSock2Dll::initialize() {
5386 if (!initialized) {
5387 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5388 if (handle != NULL) {
5389 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5390 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5391 }
5392 initialized = TRUE;
5393 }
5394 }
5395
5396
5397 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5398 assert(initialized && _WSAStartup != NULL,
5399 "WinSock2Available() not yet called");
5400 return _WSAStartup(wVersionRequested, lpWSAData);
5401 }
5402
5403 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5404 assert(initialized && _gethostbyname != NULL,
5405 "WinSock2Available() not yet called");
5406 return _gethostbyname(name);
5407 }
5408
5409 BOOL os::WinSock2Dll::WinSock2Available() {
5410 if (!initialized) {
5411 initialize();
5412 }
5413 return _WSAStartup != NULL &&
5414 _gethostbyname != NULL;
5415 }
5416
5417 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5418 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5419 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5420
5421 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5422 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5423 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5424 BOOL os::Advapi32Dll::initialized = FALSE;
5425
5426 void os::Advapi32Dll::initialize() {
5427 if (!initialized) {
5428 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5429 if (handle != NULL) {
5430 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5431 "AdjustTokenPrivileges");
5432 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5433 "OpenProcessToken");
5434 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5435 "LookupPrivilegeValueA");
5436 }
5437 initialized = TRUE;
5438 }
5439 }
5440
5441 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5442 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5443 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5444 assert(initialized && _AdjustTokenPrivileges != NULL,
5445 "AdvapiAvailable() not yet called");
5446 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5447 BufferLength, PreviousState, ReturnLength);
5448 }
5449
5450 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5451 PHANDLE TokenHandle) {
5452 assert(initialized && _OpenProcessToken != NULL,
5453 "AdvapiAvailable() not yet called");
5454 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5455 }
5456
5457 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5458 assert(initialized && _LookupPrivilegeValue != NULL,
5459 "AdvapiAvailable() not yet called");
5460 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5461 }
5462
5463 BOOL os::Advapi32Dll::AdvapiAvailable() {
5464 if (!initialized) {
5465 initialize();
5466 }
5467 return _AdjustTokenPrivileges != NULL &&
5468 _OpenProcessToken != NULL &&
5469 _LookupPrivilegeValue != NULL;
5470 }
5471
5472 #endif