1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/decoder.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
70
71 #ifdef _DEBUG
72 #include <crtdbg.h>
73 #endif
74
75
76 #include <windows.h>
77 #include <sys/types.h>
78 #include <sys/stat.h>
79 #include <sys/timeb.h>
80 #include <objidl.h>
81 #include <shlobj.h>
82
83 #include <malloc.h>
84 #include <signal.h>
85 #include <direct.h>
86 #include <errno.h>
87 #include <fcntl.h>
88 #include <io.h>
89 #include <process.h> // For _beginthreadex(), _endthreadex()
90 #include <imagehlp.h> // For os::dll_address_to_function_name
91 /* for enumerating dll libraries */
92 #include <vdmdbg.h>
93
94 // for timer info max values which include all bits
95 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
96
97 // For DLL loading/load error detection
98 // Values of PE COFF
99 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
100 #define IMAGE_FILE_SIGNATURE_LENGTH 4
101
102 static HANDLE main_process;
103 static HANDLE main_thread;
104 static int main_thread_id;
105
106 static FILETIME process_creation_time;
107 static FILETIME process_exit_time;
108 static FILETIME process_user_time;
109 static FILETIME process_kernel_time;
110
111 #ifdef _M_IA64
112 #define __CPU__ ia64
113 #elif _M_AMD64
114 #define __CPU__ amd64
115 #else
116 #define __CPU__ i486
117 #endif
118
119 // save DLL module handle, used by GetModuleFileName
120
121 HINSTANCE vm_lib_handle;
122
123 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
124 switch (reason) {
125 case DLL_PROCESS_ATTACH:
126 vm_lib_handle = hinst;
127 if(ForceTimeHighResolution)
128 timeBeginPeriod(1L);
129 break;
130 case DLL_PROCESS_DETACH:
131 if(ForceTimeHighResolution)
132 timeEndPeriod(1L);
133 break;
134 default:
135 break;
136 }
137 return true;
138 }
139
140 static inline double fileTimeAsDouble(FILETIME* time) {
141 const double high = (double) ((unsigned int) ~0);
142 const double split = 10000000.0;
143 double result = (time->dwLowDateTime / split) +
144 time->dwHighDateTime * (high/split);
145 return result;
146 }
147
148 // Implementation of os
149
150 bool os::getenv(const char* name, char* buffer, int len) {
151 int result = GetEnvironmentVariable(name, buffer, len);
152 return result > 0 && result < len;
153 }
154
155
156 // No setuid programs under Windows.
157 bool os::have_special_privileges() {
158 return false;
159 }
160
161
162 // This method is a periodic task to check for misbehaving JNI applications
163 // under CheckJNI, we can add any periodic checks here.
164 // For Windows at the moment does nothing
165 void os::run_periodic_checks() {
166 return;
167 }
168
169 #ifndef _WIN64
170 // previous UnhandledExceptionFilter, if there is one
171 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
172
173 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
174 #endif
175 void os::init_system_properties_values() {
176 /* sysclasspath, java_home, dll_dir */
177 {
178 char *home_path;
179 char *dll_path;
180 char *pslash;
181 char *bin = "\\bin";
182 char home_dir[MAX_PATH];
183
184 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
185 os::jvm_path(home_dir, sizeof(home_dir));
186 // Found the full path to jvm.dll.
187 // Now cut the path to <java_home>/jre if we can.
188 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
189 pslash = strrchr(home_dir, '\\');
190 if (pslash != NULL) {
191 *pslash = '\0'; /* get rid of \{client|server} */
192 pslash = strrchr(home_dir, '\\');
193 if (pslash != NULL)
194 *pslash = '\0'; /* get rid of \bin */
195 }
196 }
197
198 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
199 if (home_path == NULL)
200 return;
201 strcpy(home_path, home_dir);
202 Arguments::set_java_home(home_path);
203
204 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
205 if (dll_path == NULL)
206 return;
207 strcpy(dll_path, home_dir);
208 strcat(dll_path, bin);
209 Arguments::set_dll_dir(dll_path);
210
211 if (!set_boot_path('\\', ';'))
212 return;
213 }
214
215 /* library_path */
216 #define EXT_DIR "\\lib\\ext"
217 #define BIN_DIR "\\bin"
218 #define PACKAGE_DIR "\\Sun\\Java"
219 {
220 /* Win32 library search order (See the documentation for LoadLibrary):
221 *
222 * 1. The directory from which application is loaded.
223 * 2. The system wide Java Extensions directory (Java only)
224 * 3. System directory (GetSystemDirectory)
225 * 4. Windows directory (GetWindowsDirectory)
226 * 5. The PATH environment variable
227 * 6. The current directory
228 */
229
230 char *library_path;
231 char tmp[MAX_PATH];
232 char *path_str = ::getenv("PATH");
233
234 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
235 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
236
237 library_path[0] = '\0';
238
239 GetModuleFileName(NULL, tmp, sizeof(tmp));
240 *(strrchr(tmp, '\\')) = '\0';
241 strcat(library_path, tmp);
242
243 GetWindowsDirectory(tmp, sizeof(tmp));
244 strcat(library_path, ";");
245 strcat(library_path, tmp);
246 strcat(library_path, PACKAGE_DIR BIN_DIR);
247
248 GetSystemDirectory(tmp, sizeof(tmp));
249 strcat(library_path, ";");
250 strcat(library_path, tmp);
251
252 GetWindowsDirectory(tmp, sizeof(tmp));
253 strcat(library_path, ";");
254 strcat(library_path, tmp);
255
256 if (path_str) {
257 strcat(library_path, ";");
258 strcat(library_path, path_str);
259 }
260
261 strcat(library_path, ";.");
262
263 Arguments::set_library_path(library_path);
264 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
265 }
266
267 /* Default extensions directory */
268 {
269 char path[MAX_PATH];
270 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
271 GetWindowsDirectory(path, MAX_PATH);
272 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
273 path, PACKAGE_DIR, EXT_DIR);
274 Arguments::set_ext_dirs(buf);
275 }
276 #undef EXT_DIR
277 #undef BIN_DIR
278 #undef PACKAGE_DIR
279
280 /* Default endorsed standards directory. */
281 {
282 #define ENDORSED_DIR "\\lib\\endorsed"
283 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
284 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
285 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
286 Arguments::set_endorsed_dirs(buf);
287 #undef ENDORSED_DIR
288 }
289
290 #ifndef _WIN64
291 // set our UnhandledExceptionFilter and save any previous one
292 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
293 #endif
294
295 // Done
296 return;
297 }
298
299 void os::breakpoint() {
300 DebugBreak();
301 }
302
303 // Invoked from the BREAKPOINT Macro
304 extern "C" void breakpoint() {
305 os::breakpoint();
306 }
307
308 /*
309 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
310 * So far, this method is only used by Native Memory Tracking, which is
311 * only supported on Windows XP or later.
312 */
313 address os::get_caller_pc(int n) {
314 #ifdef _NMT_NOINLINE_
315 n ++;
316 #endif
317 address pc;
318 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
319 return pc;
320 }
321 return NULL;
322 }
323
324
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
330
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
335
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
339
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while( 1 )
343 {
344 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
345 if ( stack_bottom == (address)minfo.AllocationBase )
346 stack_size += minfo.RegionSize;
347 else
348 break;
349 }
350
351 #ifdef _M_IA64
352 // IA64 has memory and register stacks
353 //
354 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
355 // at thread creation (1MB backing store growing upwards, 1MB memory stack
356 // growing downwards, 2MB summed up)
357 //
358 // ...
359 // ------- top of stack (high address) -----
360 // |
361 // | 1MB
362 // | Backing Store (Register Stack)
363 // |
364 // | / \
365 // | |
366 // | |
367 // | |
368 // ------------------------ stack base -----
369 // | 1MB
370 // | Memory Stack
371 // |
372 // | |
373 // | |
374 // | |
375 // | \ /
376 // |
377 // ----- bottom of stack (low address) -----
378 // ...
379
380 stack_size = stack_size / 2;
381 #endif
382 return stack_bottom + stack_size;
383 }
384
385 size_t os::current_stack_size() {
386 size_t sz;
387 MEMORY_BASIC_INFORMATION minfo;
388 VirtualQuery(&minfo, &minfo, sizeof(minfo));
389 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
390 return sz;
391 }
392
393 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
394 const struct tm* time_struct_ptr = localtime(clock);
395 if (time_struct_ptr != NULL) {
396 *res = *time_struct_ptr;
397 return res;
398 }
399 return NULL;
400 }
401
402 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
403
404 // Thread start routine for all new Java threads
405 static unsigned __stdcall java_start(Thread* thread) {
406 // Try to randomize the cache line index of hot stack frames.
407 // This helps when threads of the same stack traces evict each other's
408 // cache lines. The threads can be either from the same JVM instance, or
409 // from different JVM instances. The benefit is especially true for
410 // processors with hyperthreading technology.
411 static int counter = 0;
412 int pid = os::current_process_id();
413 _alloca(((pid ^ counter++) & 7) * 128);
414
415 OSThread* osthr = thread->osthread();
416 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
417
418 if (UseNUMA) {
419 int lgrp_id = os::numa_get_group_id();
420 if (lgrp_id != -1) {
421 thread->set_lgrp_id(lgrp_id);
422 }
423 }
424
425
426 // Install a win32 structured exception handler around every thread created
427 // by VM, so VM can genrate error dump when an exception occurred in non-
428 // Java thread (e.g. VM thread).
429 __try {
430 thread->run();
431 } __except(topLevelExceptionFilter(
432 (_EXCEPTION_POINTERS*)_exception_info())) {
433 // Nothing to do.
434 }
435
436 // One less thread is executing
437 // When the VMThread gets here, the main thread may have already exited
438 // which frees the CodeHeap containing the Atomic::add code
439 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
440 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
441 }
442
443 return 0;
444 }
445
446 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
450
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
458
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
462
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
469
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
472
473 return osthread;
474 }
475
476
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
491
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
494
495 thread->set_osthread(osthread);
496 return true;
497 }
498
499 bool os::create_main_thread(JavaThread* thread) {
500 #ifdef ASSERT
501 thread->verify_not_published();
502 #endif
503 if (_starting_thread == NULL) {
504 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
505 if (_starting_thread == NULL) {
506 return false;
507 }
508 }
509
510 // The primordial thread is runnable from the start)
511 _starting_thread->set_state(RUNNABLE);
512
513 thread->set_osthread(_starting_thread);
514 return true;
515 }
516
517 // Allocate and initialize a new OSThread
518 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
519 unsigned thread_id;
520
521 // Allocate the OSThread object
522 OSThread* osthread = new OSThread(NULL, NULL);
523 if (osthread == NULL) {
524 return false;
525 }
526
527 // Initialize support for Java interrupts
528 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
529 if (interrupt_event == NULL) {
530 delete osthread;
531 return NULL;
532 }
533 osthread->set_interrupt_event(interrupt_event);
534 osthread->set_interrupted(false);
535
536 thread->set_osthread(osthread);
537
538 if (stack_size == 0) {
539 switch (thr_type) {
540 case os::java_thread:
541 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
542 if (JavaThread::stack_size_at_create() > 0)
543 stack_size = JavaThread::stack_size_at_create();
544 break;
545 case os::compiler_thread:
546 if (CompilerThreadStackSize > 0) {
547 stack_size = (size_t)(CompilerThreadStackSize * K);
548 break;
549 } // else fall through:
550 // use VMThreadStackSize if CompilerThreadStackSize is not defined
551 case os::vm_thread:
552 case os::pgc_thread:
553 case os::cgc_thread:
554 case os::watcher_thread:
555 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
556 break;
557 }
558 }
559
560 // Create the Win32 thread
561 //
562 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
563 // does not specify stack size. Instead, it specifies the size of
564 // initially committed space. The stack size is determined by
565 // PE header in the executable. If the committed "stack_size" is larger
566 // than default value in the PE header, the stack is rounded up to the
567 // nearest multiple of 1MB. For example if the launcher has default
568 // stack size of 320k, specifying any size less than 320k does not
569 // affect the actual stack size at all, it only affects the initial
570 // commitment. On the other hand, specifying 'stack_size' larger than
571 // default value may cause significant increase in memory usage, because
572 // not only the stack space will be rounded up to MB, but also the
573 // entire space is committed upfront.
574 //
575 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
576 // for CreateThread() that can treat 'stack_size' as stack size. However we
577 // are not supposed to call CreateThread() directly according to MSDN
578 // document because JVM uses C runtime library. The good news is that the
579 // flag appears to work with _beginthredex() as well.
580
581 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
582 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
583 #endif
584
585 HANDLE thread_handle =
586 (HANDLE)_beginthreadex(NULL,
587 (unsigned)stack_size,
588 (unsigned (__stdcall *)(void*)) java_start,
589 thread,
590 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
591 &thread_id);
592 if (thread_handle == NULL) {
593 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
594 // without the flag.
595 thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED,
601 &thread_id);
602 }
603 if (thread_handle == NULL) {
604 // Need to clean up stuff we've allocated so far
605 CloseHandle(osthread->interrupt_event());
606 thread->set_osthread(NULL);
607 delete osthread;
608 return NULL;
609 }
610
611 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
612
613 // Store info on the Win32 thread into the OSThread
614 osthread->set_thread_handle(thread_handle);
615 osthread->set_thread_id(thread_id);
616
617 // Initial thread state is INITIALIZED, not SUSPENDED
618 osthread->set_state(INITIALIZED);
619
620 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
621 return true;
622 }
623
624
625 // Free Win32 resources related to the OSThread
626 void os::free_thread(OSThread* osthread) {
627 assert(osthread != NULL, "osthread not set");
628 CloseHandle(osthread->thread_handle());
629 CloseHandle(osthread->interrupt_event());
630 delete osthread;
631 }
632
633
634 static int has_performance_count = 0;
635 static jlong first_filetime;
636 static jlong initial_performance_count;
637 static jlong performance_frequency;
638
639
640 jlong as_long(LARGE_INTEGER x) {
641 jlong result = 0; // initialization to avoid warning
642 set_high(&result, x.HighPart);
643 set_low(&result, x.LowPart);
644 return result;
645 }
646
647
648 jlong os::elapsed_counter() {
649 LARGE_INTEGER count;
650 if (has_performance_count) {
651 QueryPerformanceCounter(&count);
652 return as_long(count) - initial_performance_count;
653 } else {
654 FILETIME wt;
655 GetSystemTimeAsFileTime(&wt);
656 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
657 }
658 }
659
660
661 jlong os::elapsed_frequency() {
662 if (has_performance_count) {
663 return performance_frequency;
664 } else {
665 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
666 return 10000000;
667 }
668 }
669
670
671 julong os::available_memory() {
672 return win32::available_memory();
673 }
674
675 julong os::win32::available_memory() {
676 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
677 // value if total memory is larger than 4GB
678 MEMORYSTATUSEX ms;
679 ms.dwLength = sizeof(ms);
680 GlobalMemoryStatusEx(&ms);
681
682 return (julong)ms.ullAvailPhys;
683 }
684
685 julong os::physical_memory() {
686 return win32::physical_memory();
687 }
688
689 bool os::has_allocatable_memory_limit(julong* limit) {
690 MEMORYSTATUSEX ms;
691 ms.dwLength = sizeof(ms);
692 GlobalMemoryStatusEx(&ms);
693 #ifdef _LP64
694 *limit = (julong)ms.ullAvailVirtual;
695 return true;
696 #else
697 // Limit to 1400m because of the 2gb address space wall
698 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
699 return true;
700 #endif
701 }
702
703 // VC6 lacks DWORD_PTR
704 #if _MSC_VER < 1300
705 typedef UINT_PTR DWORD_PTR;
706 #endif
707
708 int os::active_processor_count() {
709 DWORD_PTR lpProcessAffinityMask = 0;
710 DWORD_PTR lpSystemAffinityMask = 0;
711 int proc_count = processor_count();
712 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
713 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
714 // Nof active processors is number of bits in process affinity mask
715 int bitcount = 0;
716 while (lpProcessAffinityMask != 0) {
717 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
718 bitcount++;
719 }
720 return bitcount;
721 } else {
722 return proc_count;
723 }
724 }
725
726 void os::set_native_thread_name(const char *name) {
727 // Not yet implemented.
728 return;
729 }
730
731 bool os::distribute_processes(uint length, uint* distribution) {
732 // Not yet implemented.
733 return false;
734 }
735
736 bool os::bind_to_processor(uint processor_id) {
737 // Not yet implemented.
738 return false;
739 }
740
741 static void initialize_performance_counter() {
742 LARGE_INTEGER count;
743 if (QueryPerformanceFrequency(&count)) {
744 has_performance_count = 1;
745 performance_frequency = as_long(count);
746 QueryPerformanceCounter(&count);
747 initial_performance_count = as_long(count);
748 } else {
749 has_performance_count = 0;
750 FILETIME wt;
751 GetSystemTimeAsFileTime(&wt);
752 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
753 }
754 }
755
756
757 double os::elapsedTime() {
758 return (double) elapsed_counter() / (double) elapsed_frequency();
759 }
760
761
762 // Windows format:
763 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
764 // Java format:
765 // Java standards require the number of milliseconds since 1/1/1970
766
767 // Constant offset - calculated using offset()
768 static jlong _offset = 116444736000000000;
769 // Fake time counter for reproducible results when debugging
770 static jlong fake_time = 0;
771
772 #ifdef ASSERT
773 // Just to be safe, recalculate the offset in debug mode
774 static jlong _calculated_offset = 0;
775 static int _has_calculated_offset = 0;
776
777 jlong offset() {
778 if (_has_calculated_offset) return _calculated_offset;
779 SYSTEMTIME java_origin;
780 java_origin.wYear = 1970;
781 java_origin.wMonth = 1;
782 java_origin.wDayOfWeek = 0; // ignored
783 java_origin.wDay = 1;
784 java_origin.wHour = 0;
785 java_origin.wMinute = 0;
786 java_origin.wSecond = 0;
787 java_origin.wMilliseconds = 0;
788 FILETIME jot;
789 if (!SystemTimeToFileTime(&java_origin, &jot)) {
790 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
791 }
792 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
793 _has_calculated_offset = 1;
794 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
795 return _calculated_offset;
796 }
797 #else
798 jlong offset() {
799 return _offset;
800 }
801 #endif
802
803 jlong windows_to_java_time(FILETIME wt) {
804 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
805 return (a - offset()) / 10000;
806 }
807
808 FILETIME java_to_windows_time(jlong l) {
809 jlong a = (l * 10000) + offset();
810 FILETIME result;
811 result.dwHighDateTime = high(a);
812 result.dwLowDateTime = low(a);
813 return result;
814 }
815
816 // For now, we say that Windows does not support vtime. I have no idea
817 // whether it can actually be made to (DLD, 9/13/05).
818
819 bool os::supports_vtime() { return false; }
820 bool os::enable_vtime() { return false; }
821 bool os::vtime_enabled() { return false; }
822 double os::elapsedVTime() {
823 // better than nothing, but not much
824 return elapsedTime();
825 }
826
827 jlong os::javaTimeMillis() {
828 if (UseFakeTimers) {
829 return fake_time++;
830 } else {
831 FILETIME wt;
832 GetSystemTimeAsFileTime(&wt);
833 return windows_to_java_time(wt);
834 }
835 }
836
837 jlong os::javaTimeNanos() {
838 if (!has_performance_count) {
839 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
840 } else {
841 LARGE_INTEGER current_count;
842 QueryPerformanceCounter(¤t_count);
843 double current = as_long(current_count);
844 double freq = performance_frequency;
845 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
846 return time;
847 }
848 }
849
850 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
851 if (!has_performance_count) {
852 // javaTimeMillis() doesn't have much percision,
853 // but it is not going to wrap -- so all 64 bits
854 info_ptr->max_value = ALL_64_BITS;
855
856 // this is a wall clock timer, so may skip
857 info_ptr->may_skip_backward = true;
858 info_ptr->may_skip_forward = true;
859 } else {
860 jlong freq = performance_frequency;
861 if (freq < NANOSECS_PER_SEC) {
862 // the performance counter is 64 bits and we will
863 // be multiplying it -- so no wrap in 64 bits
864 info_ptr->max_value = ALL_64_BITS;
865 } else if (freq > NANOSECS_PER_SEC) {
866 // use the max value the counter can reach to
867 // determine the max value which could be returned
868 julong max_counter = (julong)ALL_64_BITS;
869 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
870 } else {
871 // the performance counter is 64 bits and we will
872 // be using it directly -- so no wrap in 64 bits
873 info_ptr->max_value = ALL_64_BITS;
874 }
875
876 // using a counter, so no skipping
877 info_ptr->may_skip_backward = false;
878 info_ptr->may_skip_forward = false;
879 }
880 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
881 }
882
883 char* os::local_time_string(char *buf, size_t buflen) {
884 SYSTEMTIME st;
885 GetLocalTime(&st);
886 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
887 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
888 return buf;
889 }
890
891 bool os::getTimesSecs(double* process_real_time,
892 double* process_user_time,
893 double* process_system_time) {
894 HANDLE h_process = GetCurrentProcess();
895 FILETIME create_time, exit_time, kernel_time, user_time;
896 BOOL result = GetProcessTimes(h_process,
897 &create_time,
898 &exit_time,
899 &kernel_time,
900 &user_time);
901 if (result != 0) {
902 FILETIME wt;
903 GetSystemTimeAsFileTime(&wt);
904 jlong rtc_millis = windows_to_java_time(wt);
905 jlong user_millis = windows_to_java_time(user_time);
906 jlong system_millis = windows_to_java_time(kernel_time);
907 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
908 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
909 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
910 return true;
911 } else {
912 return false;
913 }
914 }
915
916 void os::shutdown() {
917
918 // allow PerfMemory to attempt cleanup of any persistent resources
919 perfMemory_exit();
920
921 // flush buffered output, finish log files
922 ostream_abort();
923
924 // Check for abort hook
925 abort_hook_t abort_hook = Arguments::abort_hook();
926 if (abort_hook != NULL) {
927 abort_hook();
928 }
929 }
930
931
932 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
933 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
934
935 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
936 HINSTANCE dbghelp;
937 EXCEPTION_POINTERS ep;
938 MINIDUMP_EXCEPTION_INFORMATION mei;
939 MINIDUMP_EXCEPTION_INFORMATION* pmei;
940
941 HANDLE hProcess = GetCurrentProcess();
942 DWORD processId = GetCurrentProcessId();
943 HANDLE dumpFile;
944 MINIDUMP_TYPE dumpType;
945 static const char* cwd;
946
947 // If running on a client version of Windows and user has not explicitly enabled dumping
948 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
949 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
950 return;
951 // If running on a server version of Windows and user has explictly disabled dumping
952 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
953 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
954 return;
955 }
956
957 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
958
959 if (dbghelp == NULL) {
960 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
961 return;
962 }
963
964 _MiniDumpWriteDump = CAST_TO_FN_PTR(
965 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
966 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
967 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
968
969 if (_MiniDumpWriteDump == NULL) {
970 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
971 return;
972 }
973
974 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
975
976 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
977 // API_VERSION_NUMBER 11 or higher contains the ones we want though
978 #if API_VERSION_NUMBER >= 11
979 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
980 MiniDumpWithUnloadedModules);
981 #endif
982
983 cwd = get_current_directory(NULL, 0);
984 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
985 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
986
987 if (dumpFile == INVALID_HANDLE_VALUE) {
988 VMError::report_coredump_status("Failed to create file for dumping", false);
989 return;
990 }
991 if (exceptionRecord != NULL && contextRecord != NULL) {
992 ep.ContextRecord = (PCONTEXT) contextRecord;
993 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
994
995 mei.ThreadId = GetCurrentThreadId();
996 mei.ExceptionPointers = &ep;
997 pmei = &mei;
998 } else {
999 pmei = NULL;
1000 }
1001
1002
1003 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1004 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1005 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1006 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1007 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
1008 } else {
1009 VMError::report_coredump_status(buffer, true);
1010 }
1011
1012 CloseHandle(dumpFile);
1013 }
1014
1015
1016
1017 void os::abort(bool dump_core)
1018 {
1019 os::shutdown();
1020 // no core dump on Windows
1021 ::exit(1);
1022 }
1023
1024 // Die immediately, no exit hook, no abort hook, no cleanup.
1025 void os::die() {
1026 _exit(-1);
1027 }
1028
1029 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1030 // * dirent_md.c 1.15 00/02/02
1031 //
1032 // The declarations for DIR and struct dirent are in jvm_win32.h.
1033
1034 /* Caller must have already run dirname through JVM_NativePath, which removes
1035 duplicate slashes and converts all instances of '/' into '\\'. */
1036
1037 DIR *
1038 os::opendir(const char *dirname)
1039 {
1040 assert(dirname != NULL, "just checking"); // hotspot change
1041 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1042 DWORD fattr; // hotspot change
1043 char alt_dirname[4] = { 0, 0, 0, 0 };
1044
1045 if (dirp == 0) {
1046 errno = ENOMEM;
1047 return 0;
1048 }
1049
1050 /*
1051 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1052 * as a directory in FindFirstFile(). We detect this case here and
1053 * prepend the current drive name.
1054 */
1055 if (dirname[1] == '\0' && dirname[0] == '\\') {
1056 alt_dirname[0] = _getdrive() + 'A' - 1;
1057 alt_dirname[1] = ':';
1058 alt_dirname[2] = '\\';
1059 alt_dirname[3] = '\0';
1060 dirname = alt_dirname;
1061 }
1062
1063 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1064 if (dirp->path == 0) {
1065 free(dirp, mtInternal);
1066 errno = ENOMEM;
1067 return 0;
1068 }
1069 strcpy(dirp->path, dirname);
1070
1071 fattr = GetFileAttributes(dirp->path);
1072 if (fattr == 0xffffffff) {
1073 free(dirp->path, mtInternal);
1074 free(dirp, mtInternal);
1075 errno = ENOENT;
1076 return 0;
1077 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1078 free(dirp->path, mtInternal);
1079 free(dirp, mtInternal);
1080 errno = ENOTDIR;
1081 return 0;
1082 }
1083
1084 /* Append "*.*", or possibly "\\*.*", to path */
1085 if (dirp->path[1] == ':'
1086 && (dirp->path[2] == '\0'
1087 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1088 /* No '\\' needed for cases like "Z:" or "Z:\" */
1089 strcat(dirp->path, "*.*");
1090 } else {
1091 strcat(dirp->path, "\\*.*");
1092 }
1093
1094 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1095 if (dirp->handle == INVALID_HANDLE_VALUE) {
1096 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1097 free(dirp->path, mtInternal);
1098 free(dirp, mtInternal);
1099 errno = EACCES;
1100 return 0;
1101 }
1102 }
1103 return dirp;
1104 }
1105
1106 /* parameter dbuf unused on Windows */
1107
1108 struct dirent *
1109 os::readdir(DIR *dirp, dirent *dbuf)
1110 {
1111 assert(dirp != NULL, "just checking"); // hotspot change
1112 if (dirp->handle == INVALID_HANDLE_VALUE) {
1113 return 0;
1114 }
1115
1116 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1117
1118 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1119 if (GetLastError() == ERROR_INVALID_HANDLE) {
1120 errno = EBADF;
1121 return 0;
1122 }
1123 FindClose(dirp->handle);
1124 dirp->handle = INVALID_HANDLE_VALUE;
1125 }
1126
1127 return &dirp->dirent;
1128 }
1129
1130 int
1131 os::closedir(DIR *dirp)
1132 {
1133 assert(dirp != NULL, "just checking"); // hotspot change
1134 if (dirp->handle != INVALID_HANDLE_VALUE) {
1135 if (!FindClose(dirp->handle)) {
1136 errno = EBADF;
1137 return -1;
1138 }
1139 dirp->handle = INVALID_HANDLE_VALUE;
1140 }
1141 free(dirp->path, mtInternal);
1142 free(dirp, mtInternal);
1143 return 0;
1144 }
1145
1146 // This must be hard coded because it's the system's temporary
1147 // directory not the java application's temp directory, ala java.io.tmpdir.
1148 const char* os::get_temp_directory() {
1149 static char path_buf[MAX_PATH];
1150 if (GetTempPath(MAX_PATH, path_buf)>0)
1151 return path_buf;
1152 else{
1153 path_buf[0]='\0';
1154 return path_buf;
1155 }
1156 }
1157
1158 static bool file_exists(const char* filename) {
1159 if (filename == NULL || strlen(filename) == 0) {
1160 return false;
1161 }
1162 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1163 }
1164
1165 bool os::dll_build_name(char *buffer, size_t buflen,
1166 const char* pname, const char* fname) {
1167 bool retval = false;
1168 const size_t pnamelen = pname ? strlen(pname) : 0;
1169 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1170
1171 // Return error on buffer overflow.
1172 if (pnamelen + strlen(fname) + 10 > buflen) {
1173 return retval;
1174 }
1175
1176 if (pnamelen == 0) {
1177 jio_snprintf(buffer, buflen, "%s.dll", fname);
1178 retval = true;
1179 } else if (c == ':' || c == '\\') {
1180 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1181 retval = true;
1182 } else if (strchr(pname, *os::path_separator()) != NULL) {
1183 int n;
1184 char** pelements = split_path(pname, &n);
1185 if (pelements == NULL) {
1186 return false;
1187 }
1188 for (int i = 0 ; i < n ; i++) {
1189 char* path = pelements[i];
1190 // Really shouldn't be NULL, but check can't hurt
1191 size_t plen = (path == NULL) ? 0 : strlen(path);
1192 if (plen == 0) {
1193 continue; // skip the empty path values
1194 }
1195 const char lastchar = path[plen - 1];
1196 if (lastchar == ':' || lastchar == '\\') {
1197 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1198 } else {
1199 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1200 }
1201 if (file_exists(buffer)) {
1202 retval = true;
1203 break;
1204 }
1205 }
1206 // release the storage
1207 for (int i = 0 ; i < n ; i++) {
1208 if (pelements[i] != NULL) {
1209 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1210 }
1211 }
1212 if (pelements != NULL) {
1213 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1214 }
1215 } else {
1216 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1217 retval = true;
1218 }
1219 return retval;
1220 }
1221
1222 // Needs to be in os specific directory because windows requires another
1223 // header file <direct.h>
1224 const char* os::get_current_directory(char *buf, size_t buflen) {
1225 int n = static_cast<int>(buflen);
1226 if (buflen > INT_MAX) n = INT_MAX;
1227 return _getcwd(buf, n);
1228 }
1229
1230 //-----------------------------------------------------------
1231 // Helper functions for fatal error handler
1232 #ifdef _WIN64
1233 // Helper routine which returns true if address in
1234 // within the NTDLL address space.
1235 //
1236 static bool _addr_in_ntdll( address addr )
1237 {
1238 HMODULE hmod;
1239 MODULEINFO minfo;
1240
1241 hmod = GetModuleHandle("NTDLL.DLL");
1242 if ( hmod == NULL ) return false;
1243 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1244 &minfo, sizeof(MODULEINFO)) )
1245 return false;
1246
1247 if ( (addr >= minfo.lpBaseOfDll) &&
1248 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1249 return true;
1250 else
1251 return false;
1252 }
1253 #endif
1254
1255
1256 // Enumerate all modules for a given process ID
1257 //
1258 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1259 // different API for doing this. We use PSAPI.DLL on NT based
1260 // Windows and ToolHelp on 95/98/Me.
1261
1262 // Callback function that is called by enumerate_modules() on
1263 // every DLL module.
1264 // Input parameters:
1265 // int pid,
1266 // char* module_file_name,
1267 // address module_base_addr,
1268 // unsigned module_size,
1269 // void* param
1270 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1271
1272 // enumerate_modules for Windows NT, using PSAPI
1273 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1274 {
1275 HANDLE hProcess ;
1276
1277 # define MAX_NUM_MODULES 128
1278 HMODULE modules[MAX_NUM_MODULES];
1279 static char filename[ MAX_PATH ];
1280 int result = 0;
1281
1282 if (!os::PSApiDll::PSApiAvailable()) {
1283 return 0;
1284 }
1285
1286 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1287 FALSE, pid ) ;
1288 if (hProcess == NULL) return 0;
1289
1290 DWORD size_needed;
1291 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1292 sizeof(modules), &size_needed)) {
1293 CloseHandle( hProcess );
1294 return 0;
1295 }
1296
1297 // number of modules that are currently loaded
1298 int num_modules = size_needed / sizeof(HMODULE);
1299
1300 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1301 // Get Full pathname:
1302 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1303 filename, sizeof(filename))) {
1304 filename[0] = '\0';
1305 }
1306
1307 MODULEINFO modinfo;
1308 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1309 &modinfo, sizeof(modinfo))) {
1310 modinfo.lpBaseOfDll = NULL;
1311 modinfo.SizeOfImage = 0;
1312 }
1313
1314 // Invoke callback function
1315 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1316 modinfo.SizeOfImage, param);
1317 if (result) break;
1318 }
1319
1320 CloseHandle( hProcess ) ;
1321 return result;
1322 }
1323
1324
1325 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1326 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1327 {
1328 HANDLE hSnapShot ;
1329 static MODULEENTRY32 modentry ;
1330 int result = 0;
1331
1332 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1333 return 0;
1334 }
1335
1336 // Get a handle to a Toolhelp snapshot of the system
1337 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1338 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1339 return FALSE ;
1340 }
1341
1342 // iterate through all modules
1343 modentry.dwSize = sizeof(MODULEENTRY32) ;
1344 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1345
1346 while( not_done ) {
1347 // invoke the callback
1348 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1349 modentry.modBaseSize, param);
1350 if (result) break;
1351
1352 modentry.dwSize = sizeof(MODULEENTRY32) ;
1353 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1354 }
1355
1356 CloseHandle(hSnapShot);
1357 return result;
1358 }
1359
1360 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1361 {
1362 // Get current process ID if caller doesn't provide it.
1363 if (!pid) pid = os::current_process_id();
1364
1365 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1366 else return _enumerate_modules_windows(pid, func, param);
1367 }
1368
1369 struct _modinfo {
1370 address addr;
1371 char* full_path; // point to a char buffer
1372 int buflen; // size of the buffer
1373 address base_addr;
1374 };
1375
1376 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1377 unsigned size, void * param) {
1378 struct _modinfo *pmod = (struct _modinfo *)param;
1379 if (!pmod) return -1;
1380
1381 if (base_addr <= pmod->addr &&
1382 base_addr+size > pmod->addr) {
1383 // if a buffer is provided, copy path name to the buffer
1384 if (pmod->full_path) {
1385 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1386 }
1387 pmod->base_addr = base_addr;
1388 return 1;
1389 }
1390 return 0;
1391 }
1392
1393 bool os::dll_address_to_library_name(address addr, char* buf,
1394 int buflen, int* offset) {
1395 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1396 // return the full path to the DLL file, sometimes it returns path
1397 // to the corresponding PDB file (debug info); sometimes it only
1398 // returns partial path, which makes life painful.
1399
1400 struct _modinfo mi;
1401 mi.addr = addr;
1402 mi.full_path = buf;
1403 mi.buflen = buflen;
1404 int pid = os::current_process_id();
1405 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1406 // buf already contains path name
1407 if (offset) *offset = addr - mi.base_addr;
1408 return true;
1409 } else {
1410 if (buf) buf[0] = '\0';
1411 if (offset) *offset = -1;
1412 return false;
1413 }
1414 }
1415
1416 bool os::dll_address_to_function_name(address addr, char *buf,
1417 int buflen, int *offset) {
1418 if (Decoder::decode(addr, buf, buflen, offset)) {
1419 return true;
1420 }
1421 if (offset != NULL) *offset = -1;
1422 if (buf != NULL) buf[0] = '\0';
1423 return false;
1424 }
1425
1426 // save the start and end address of jvm.dll into param[0] and param[1]
1427 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1428 unsigned size, void * param) {
1429 if (!param) return -1;
1430
1431 if (base_addr <= (address)_locate_jvm_dll &&
1432 base_addr+size > (address)_locate_jvm_dll) {
1433 ((address*)param)[0] = base_addr;
1434 ((address*)param)[1] = base_addr + size;
1435 return 1;
1436 }
1437 return 0;
1438 }
1439
1440 address vm_lib_location[2]; // start and end address of jvm.dll
1441
1442 // check if addr is inside jvm.dll
1443 bool os::address_is_in_vm(address addr) {
1444 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1445 int pid = os::current_process_id();
1446 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1447 assert(false, "Can't find jvm module.");
1448 return false;
1449 }
1450 }
1451
1452 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1453 }
1454
1455 // print module info; param is outputStream*
1456 static int _print_module(int pid, char* fname, address base,
1457 unsigned size, void* param) {
1458 if (!param) return -1;
1459
1460 outputStream* st = (outputStream*)param;
1461
1462 address end_addr = base + size;
1463 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1464 return 0;
1465 }
1466
1467 // Loads .dll/.so and
1468 // in case of error it checks if .dll/.so was built for the
1469 // same architecture as Hotspot is running on
1470 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1471 {
1472 void * result = LoadLibrary(name);
1473 if (result != NULL)
1474 {
1475 return result;
1476 }
1477
1478 DWORD errcode = GetLastError();
1479 if (errcode == ERROR_MOD_NOT_FOUND) {
1480 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1481 ebuf[ebuflen-1]='\0';
1482 return NULL;
1483 }
1484
1485 // Parsing dll below
1486 // If we can read dll-info and find that dll was built
1487 // for an architecture other than Hotspot is running in
1488 // - then print to buffer "DLL was built for a different architecture"
1489 // else call os::lasterror to obtain system error message
1490
1491 // Read system error message into ebuf
1492 // It may or may not be overwritten below (in the for loop and just above)
1493 lasterror(ebuf, (size_t) ebuflen);
1494 ebuf[ebuflen-1]='\0';
1495 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1496 if (file_descriptor<0)
1497 {
1498 return NULL;
1499 }
1500
1501 uint32_t signature_offset;
1502 uint16_t lib_arch=0;
1503 bool failed_to_get_lib_arch=
1504 (
1505 //Go to position 3c in the dll
1506 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1507 ||
1508 // Read loacation of signature
1509 (sizeof(signature_offset)!=
1510 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1511 ||
1512 //Go to COFF File Header in dll
1513 //that is located after"signature" (4 bytes long)
1514 (os::seek_to_file_offset(file_descriptor,
1515 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1516 ||
1517 //Read field that contains code of architecture
1518 // that dll was build for
1519 (sizeof(lib_arch)!=
1520 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1521 );
1522
1523 ::close(file_descriptor);
1524 if (failed_to_get_lib_arch)
1525 {
1526 // file i/o error - report os::lasterror(...) msg
1527 return NULL;
1528 }
1529
1530 typedef struct
1531 {
1532 uint16_t arch_code;
1533 char* arch_name;
1534 } arch_t;
1535
1536 static const arch_t arch_array[]={
1537 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1538 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1539 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1540 };
1541 #if (defined _M_IA64)
1542 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1543 #elif (defined _M_AMD64)
1544 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1545 #elif (defined _M_IX86)
1546 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1547 #else
1548 #error Method os::dll_load requires that one of following \
1549 is defined :_M_IA64,_M_AMD64 or _M_IX86
1550 #endif
1551
1552
1553 // Obtain a string for printf operation
1554 // lib_arch_str shall contain string what platform this .dll was built for
1555 // running_arch_str shall string contain what platform Hotspot was built for
1556 char *running_arch_str=NULL,*lib_arch_str=NULL;
1557 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1558 {
1559 if (lib_arch==arch_array[i].arch_code)
1560 lib_arch_str=arch_array[i].arch_name;
1561 if (running_arch==arch_array[i].arch_code)
1562 running_arch_str=arch_array[i].arch_name;
1563 }
1564
1565 assert(running_arch_str,
1566 "Didn't find runing architecture code in arch_array");
1567
1568 // If the architure is right
1569 // but some other error took place - report os::lasterror(...) msg
1570 if (lib_arch == running_arch)
1571 {
1572 return NULL;
1573 }
1574
1575 if (lib_arch_str!=NULL)
1576 {
1577 ::_snprintf(ebuf, ebuflen-1,
1578 "Can't load %s-bit .dll on a %s-bit platform",
1579 lib_arch_str,running_arch_str);
1580 }
1581 else
1582 {
1583 // don't know what architecture this dll was build for
1584 ::_snprintf(ebuf, ebuflen-1,
1585 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1586 lib_arch,running_arch_str);
1587 }
1588
1589 return NULL;
1590 }
1591
1592
1593 void os::print_dll_info(outputStream *st) {
1594 int pid = os::current_process_id();
1595 st->print_cr("Dynamic libraries:");
1596 enumerate_modules(pid, _print_module, (void *)st);
1597 }
1598
1599 void os::print_os_info_brief(outputStream* st) {
1600 os::print_os_info(st);
1601 }
1602
1603 void os::print_os_info(outputStream* st) {
1604 st->print("OS:");
1605
1606 os::win32::print_windows_version(st);
1607 }
1608
1609 void os::win32::print_windows_version(outputStream* st) {
1610 OSVERSIONINFOEX osvi;
1611 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1612 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1613
1614 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1615 st->print_cr("N/A");
1616 return;
1617 }
1618
1619 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1620 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1621 switch (os_vers) {
1622 case 3051: st->print(" Windows NT 3.51"); break;
1623 case 4000: st->print(" Windows NT 4.0"); break;
1624 case 5000: st->print(" Windows 2000"); break;
1625 case 5001: st->print(" Windows XP"); break;
1626 case 5002:
1627 case 6000:
1628 case 6001:
1629 case 6002: {
1630 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1631 // find out whether we are running on 64 bit processor or not.
1632 SYSTEM_INFO si;
1633 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1634 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1635 GetSystemInfo(&si);
1636 } else {
1637 os::Kernel32Dll::GetNativeSystemInfo(&si);
1638 }
1639 if (os_vers == 5002) {
1640 if (osvi.wProductType == VER_NT_WORKSTATION &&
1641 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1642 st->print(" Windows XP x64 Edition");
1643 else
1644 st->print(" Windows Server 2003 family");
1645 } else if (os_vers == 6000) {
1646 if (osvi.wProductType == VER_NT_WORKSTATION)
1647 st->print(" Windows Vista");
1648 else
1649 st->print(" Windows Server 2008");
1650 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1651 st->print(" , 64 bit");
1652 } else if (os_vers == 6001) {
1653 if (osvi.wProductType == VER_NT_WORKSTATION) {
1654 st->print(" Windows 7");
1655 } else {
1656 // Unrecognized windows, print out its major and minor versions
1657 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1658 }
1659 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1660 st->print(" , 64 bit");
1661 } else if (os_vers == 6002) {
1662 if (osvi.wProductType == VER_NT_WORKSTATION) {
1663 st->print(" Windows 8");
1664 } else {
1665 st->print(" Windows Server 2012");
1666 }
1667 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1668 st->print(" , 64 bit");
1669 } else { // future os
1670 // Unrecognized windows, print out its major and minor versions
1671 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1672 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1673 st->print(" , 64 bit");
1674 }
1675 break;
1676 }
1677 default: // future windows, print out its major and minor versions
1678 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1679 }
1680 } else {
1681 switch (os_vers) {
1682 case 4000: st->print(" Windows 95"); break;
1683 case 4010: st->print(" Windows 98"); break;
1684 case 4090: st->print(" Windows Me"); break;
1685 default: // future windows, print out its major and minor versions
1686 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1687 }
1688 }
1689 st->print(" Build %d", osvi.dwBuildNumber);
1690 st->print(" %s", osvi.szCSDVersion); // service pack
1691 st->cr();
1692 }
1693
1694 void os::pd_print_cpu_info(outputStream* st) {
1695 // Nothing to do for now.
1696 }
1697
1698 void os::print_memory_info(outputStream* st) {
1699 st->print("Memory:");
1700 st->print(" %dk page", os::vm_page_size()>>10);
1701
1702 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1703 // value if total memory is larger than 4GB
1704 MEMORYSTATUSEX ms;
1705 ms.dwLength = sizeof(ms);
1706 GlobalMemoryStatusEx(&ms);
1707
1708 st->print(", physical %uk", os::physical_memory() >> 10);
1709 st->print("(%uk free)", os::available_memory() >> 10);
1710
1711 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1712 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1713 st->cr();
1714 }
1715
1716 void os::print_siginfo(outputStream *st, void *siginfo) {
1717 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1718 st->print("siginfo:");
1719 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1720
1721 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1722 er->NumberParameters >= 2) {
1723 switch (er->ExceptionInformation[0]) {
1724 case 0: st->print(", reading address"); break;
1725 case 1: st->print(", writing address"); break;
1726 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1727 er->ExceptionInformation[0]);
1728 }
1729 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1730 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1731 er->NumberParameters >= 2 && UseSharedSpaces) {
1732 FileMapInfo* mapinfo = FileMapInfo::current_info();
1733 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1734 st->print("\n\nError accessing class data sharing archive." \
1735 " Mapped file inaccessible during execution, " \
1736 " possible disk/network problem.");
1737 }
1738 } else {
1739 int num = er->NumberParameters;
1740 if (num > 0) {
1741 st->print(", ExceptionInformation=");
1742 for (int i = 0; i < num; i++) {
1743 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1744 }
1745 }
1746 }
1747 st->cr();
1748 }
1749
1750 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1751 // do nothing
1752 }
1753
1754 static char saved_jvm_path[MAX_PATH] = {0};
1755
1756 // Find the full path to the current module, jvm.dll
1757 void os::jvm_path(char *buf, jint buflen) {
1758 // Error checking.
1759 if (buflen < MAX_PATH) {
1760 assert(false, "must use a large-enough buffer");
1761 buf[0] = '\0';
1762 return;
1763 }
1764 // Lazy resolve the path to current module.
1765 if (saved_jvm_path[0] != 0) {
1766 strcpy(buf, saved_jvm_path);
1767 return;
1768 }
1769
1770 buf[0] = '\0';
1771 if (Arguments::created_by_gamma_launcher()) {
1772 // Support for the gamma launcher. Check for an
1773 // JAVA_HOME environment variable
1774 // and fix up the path so it looks like
1775 // libjvm.so is installed there (append a fake suffix
1776 // hotspot/libjvm.so).
1777 char* java_home_var = ::getenv("JAVA_HOME");
1778 if (java_home_var != NULL && java_home_var[0] != 0) {
1779
1780 strncpy(buf, java_home_var, buflen);
1781
1782 // determine if this is a legacy image or modules image
1783 // modules image doesn't have "jre" subdirectory
1784 size_t len = strlen(buf);
1785 char* jrebin_p = buf + len;
1786 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1787 if (0 != _access(buf, 0)) {
1788 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1789 }
1790 len = strlen(buf);
1791 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1792 }
1793 }
1794
1795 if(buf[0] == '\0') {
1796 GetModuleFileName(vm_lib_handle, buf, buflen);
1797 }
1798 strcpy(saved_jvm_path, buf);
1799 }
1800
1801
1802 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1803 #ifndef _WIN64
1804 st->print("_");
1805 #endif
1806 }
1807
1808
1809 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1810 #ifndef _WIN64
1811 st->print("@%d", args_size * sizeof(int));
1812 #endif
1813 }
1814
1815 // This method is a copy of JDK's sysGetLastErrorString
1816 // from src/windows/hpi/src/system_md.c
1817
1818 size_t os::lasterror(char* buf, size_t len) {
1819 DWORD errval;
1820
1821 if ((errval = GetLastError()) != 0) {
1822 // DOS error
1823 size_t n = (size_t)FormatMessage(
1824 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1825 NULL,
1826 errval,
1827 0,
1828 buf,
1829 (DWORD)len,
1830 NULL);
1831 if (n > 3) {
1832 // Drop final '.', CR, LF
1833 if (buf[n - 1] == '\n') n--;
1834 if (buf[n - 1] == '\r') n--;
1835 if (buf[n - 1] == '.') n--;
1836 buf[n] = '\0';
1837 }
1838 return n;
1839 }
1840
1841 if (errno != 0) {
1842 // C runtime error that has no corresponding DOS error code
1843 const char* s = strerror(errno);
1844 size_t n = strlen(s);
1845 if (n >= len) n = len - 1;
1846 strncpy(buf, s, n);
1847 buf[n] = '\0';
1848 return n;
1849 }
1850
1851 return 0;
1852 }
1853
1854 int os::get_last_error() {
1855 DWORD error = GetLastError();
1856 if (error == 0)
1857 error = errno;
1858 return (int)error;
1859 }
1860
1861 // sun.misc.Signal
1862 // NOTE that this is a workaround for an apparent kernel bug where if
1863 // a signal handler for SIGBREAK is installed then that signal handler
1864 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1865 // See bug 4416763.
1866 static void (*sigbreakHandler)(int) = NULL;
1867
1868 static void UserHandler(int sig, void *siginfo, void *context) {
1869 os::signal_notify(sig);
1870 // We need to reinstate the signal handler each time...
1871 os::signal(sig, (void*)UserHandler);
1872 }
1873
1874 void* os::user_handler() {
1875 return (void*) UserHandler;
1876 }
1877
1878 void* os::signal(int signal_number, void* handler) {
1879 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1880 void (*oldHandler)(int) = sigbreakHandler;
1881 sigbreakHandler = (void (*)(int)) handler;
1882 return (void*) oldHandler;
1883 } else {
1884 return (void*)::signal(signal_number, (void (*)(int))handler);
1885 }
1886 }
1887
1888 void os::signal_raise(int signal_number) {
1889 raise(signal_number);
1890 }
1891
1892 // The Win32 C runtime library maps all console control events other than ^C
1893 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1894 // logoff, and shutdown events. We therefore install our own console handler
1895 // that raises SIGTERM for the latter cases.
1896 //
1897 static BOOL WINAPI consoleHandler(DWORD event) {
1898 switch(event) {
1899 case CTRL_C_EVENT:
1900 if (is_error_reported()) {
1901 // Ctrl-C is pressed during error reporting, likely because the error
1902 // handler fails to abort. Let VM die immediately.
1903 os::die();
1904 }
1905
1906 os::signal_raise(SIGINT);
1907 return TRUE;
1908 break;
1909 case CTRL_BREAK_EVENT:
1910 if (sigbreakHandler != NULL) {
1911 (*sigbreakHandler)(SIGBREAK);
1912 }
1913 return TRUE;
1914 break;
1915 case CTRL_LOGOFF_EVENT: {
1916 // Don't terminate JVM if it is running in a non-interactive session,
1917 // such as a service process.
1918 USEROBJECTFLAGS flags;
1919 HANDLE handle = GetProcessWindowStation();
1920 if (handle != NULL &&
1921 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1922 sizeof( USEROBJECTFLAGS), NULL)) {
1923 // If it is a non-interactive session, let next handler to deal
1924 // with it.
1925 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1926 return FALSE;
1927 }
1928 }
1929 }
1930 case CTRL_CLOSE_EVENT:
1931 case CTRL_SHUTDOWN_EVENT:
1932 os::signal_raise(SIGTERM);
1933 return TRUE;
1934 break;
1935 default:
1936 break;
1937 }
1938 return FALSE;
1939 }
1940
1941 /*
1942 * The following code is moved from os.cpp for making this
1943 * code platform specific, which it is by its very nature.
1944 */
1945
1946 // Return maximum OS signal used + 1 for internal use only
1947 // Used as exit signal for signal_thread
1948 int os::sigexitnum_pd(){
1949 return NSIG;
1950 }
1951
1952 // a counter for each possible signal value, including signal_thread exit signal
1953 static volatile jint pending_signals[NSIG+1] = { 0 };
1954 static HANDLE sig_sem = NULL;
1955
1956 void os::signal_init_pd() {
1957 // Initialize signal structures
1958 memset((void*)pending_signals, 0, sizeof(pending_signals));
1959
1960 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1961
1962 // Programs embedding the VM do not want it to attempt to receive
1963 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1964 // shutdown hooks mechanism introduced in 1.3. For example, when
1965 // the VM is run as part of a Windows NT service (i.e., a servlet
1966 // engine in a web server), the correct behavior is for any console
1967 // control handler to return FALSE, not TRUE, because the OS's
1968 // "final" handler for such events allows the process to continue if
1969 // it is a service (while terminating it if it is not a service).
1970 // To make this behavior uniform and the mechanism simpler, we
1971 // completely disable the VM's usage of these console events if -Xrs
1972 // (=ReduceSignalUsage) is specified. This means, for example, that
1973 // the CTRL-BREAK thread dump mechanism is also disabled in this
1974 // case. See bugs 4323062, 4345157, and related bugs.
1975
1976 if (!ReduceSignalUsage) {
1977 // Add a CTRL-C handler
1978 SetConsoleCtrlHandler(consoleHandler, TRUE);
1979 }
1980 }
1981
1982 void os::signal_notify(int signal_number) {
1983 BOOL ret;
1984 if (sig_sem != NULL) {
1985 Atomic::inc(&pending_signals[signal_number]);
1986 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1987 assert(ret != 0, "ReleaseSemaphore() failed");
1988 }
1989 }
1990
1991 static int check_pending_signals(bool wait_for_signal) {
1992 DWORD ret;
1993 while (true) {
1994 for (int i = 0; i < NSIG + 1; i++) {
1995 jint n = pending_signals[i];
1996 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1997 return i;
1998 }
1999 }
2000 if (!wait_for_signal) {
2001 return -1;
2002 }
2003
2004 JavaThread *thread = JavaThread::current();
2005
2006 ThreadBlockInVM tbivm(thread);
2007
2008 bool threadIsSuspended;
2009 do {
2010 thread->set_suspend_equivalent();
2011 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2012 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2013 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2014
2015 // were we externally suspended while we were waiting?
2016 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2017 if (threadIsSuspended) {
2018 //
2019 // The semaphore has been incremented, but while we were waiting
2020 // another thread suspended us. We don't want to continue running
2021 // while suspended because that would surprise the thread that
2022 // suspended us.
2023 //
2024 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2025 assert(ret != 0, "ReleaseSemaphore() failed");
2026
2027 thread->java_suspend_self();
2028 }
2029 } while (threadIsSuspended);
2030 }
2031 }
2032
2033 int os::signal_lookup() {
2034 return check_pending_signals(false);
2035 }
2036
2037 int os::signal_wait() {
2038 return check_pending_signals(true);
2039 }
2040
2041 // Implicit OS exception handling
2042
2043 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2044 JavaThread* thread = JavaThread::current();
2045 // Save pc in thread
2046 #ifdef _M_IA64
2047 // Do not blow up if no thread info available.
2048 if (thread) {
2049 // Saving PRECISE pc (with slot information) in thread.
2050 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2051 // Convert precise PC into "Unix" format
2052 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2053 thread->set_saved_exception_pc((address)precise_pc);
2054 }
2055 // Set pc to handler
2056 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2057 // Clear out psr.ri (= Restart Instruction) in order to continue
2058 // at the beginning of the target bundle.
2059 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2060 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2061 #elif _M_AMD64
2062 // Do not blow up if no thread info available.
2063 if (thread) {
2064 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2065 }
2066 // Set pc to handler
2067 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2068 #else
2069 // Do not blow up if no thread info available.
2070 if (thread) {
2071 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2072 }
2073 // Set pc to handler
2074 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2075 #endif
2076
2077 // Continue the execution
2078 return EXCEPTION_CONTINUE_EXECUTION;
2079 }
2080
2081
2082 // Used for PostMortemDump
2083 extern "C" void safepoints();
2084 extern "C" void find(int x);
2085 extern "C" void events();
2086
2087 // According to Windows API documentation, an illegal instruction sequence should generate
2088 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2089 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2090 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2091
2092 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2093
2094 // From "Execution Protection in the Windows Operating System" draft 0.35
2095 // Once a system header becomes available, the "real" define should be
2096 // included or copied here.
2097 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2098
2099 // Handle NAT Bit consumption on IA64.
2100 #ifdef _M_IA64
2101 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2102 #endif
2103
2104 // Windows Vista/2008 heap corruption check
2105 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2106
2107 #define def_excpt(val) #val, val
2108
2109 struct siglabel {
2110 char *name;
2111 int number;
2112 };
2113
2114 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2115 // C++ compiler contain this error code. Because this is a compiler-generated
2116 // error, the code is not listed in the Win32 API header files.
2117 // The code is actually a cryptic mnemonic device, with the initial "E"
2118 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2119 // ASCII values of "msc".
2120
2121 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2122
2123
2124 struct siglabel exceptlabels[] = {
2125 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2126 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2127 def_excpt(EXCEPTION_BREAKPOINT),
2128 def_excpt(EXCEPTION_SINGLE_STEP),
2129 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2130 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2131 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2132 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2133 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2134 def_excpt(EXCEPTION_FLT_OVERFLOW),
2135 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2136 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2137 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2138 def_excpt(EXCEPTION_INT_OVERFLOW),
2139 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2140 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2141 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2142 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2143 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2144 def_excpt(EXCEPTION_STACK_OVERFLOW),
2145 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2146 def_excpt(EXCEPTION_GUARD_PAGE),
2147 def_excpt(EXCEPTION_INVALID_HANDLE),
2148 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2149 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2150 #ifdef _M_IA64
2151 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2152 #endif
2153 NULL, 0
2154 };
2155
2156 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2157 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2158 if (exceptlabels[i].number == exception_code) {
2159 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2160 return buf;
2161 }
2162 }
2163
2164 return NULL;
2165 }
2166
2167 //-----------------------------------------------------------------------------
2168 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2169 // handle exception caused by idiv; should only happen for -MinInt/-1
2170 // (division by zero is handled explicitly)
2171 #ifdef _M_IA64
2172 assert(0, "Fix Handle_IDiv_Exception");
2173 #elif _M_AMD64
2174 PCONTEXT ctx = exceptionInfo->ContextRecord;
2175 address pc = (address)ctx->Rip;
2176 assert(pc[0] == 0xF7, "not an idiv opcode");
2177 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2178 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2179 // set correct result values and continue after idiv instruction
2180 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2181 ctx->Rax = (DWORD)min_jint; // result
2182 ctx->Rdx = (DWORD)0; // remainder
2183 // Continue the execution
2184 #else
2185 PCONTEXT ctx = exceptionInfo->ContextRecord;
2186 address pc = (address)ctx->Eip;
2187 assert(pc[0] == 0xF7, "not an idiv opcode");
2188 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2189 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2190 // set correct result values and continue after idiv instruction
2191 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2192 ctx->Eax = (DWORD)min_jint; // result
2193 ctx->Edx = (DWORD)0; // remainder
2194 // Continue the execution
2195 #endif
2196 return EXCEPTION_CONTINUE_EXECUTION;
2197 }
2198
2199 #ifndef _WIN64
2200 //-----------------------------------------------------------------------------
2201 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2202 // handle exception caused by native method modifying control word
2203 PCONTEXT ctx = exceptionInfo->ContextRecord;
2204 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2205
2206 switch (exception_code) {
2207 case EXCEPTION_FLT_DENORMAL_OPERAND:
2208 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2209 case EXCEPTION_FLT_INEXACT_RESULT:
2210 case EXCEPTION_FLT_INVALID_OPERATION:
2211 case EXCEPTION_FLT_OVERFLOW:
2212 case EXCEPTION_FLT_STACK_CHECK:
2213 case EXCEPTION_FLT_UNDERFLOW:
2214 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2215 if (fp_control_word != ctx->FloatSave.ControlWord) {
2216 // Restore FPCW and mask out FLT exceptions
2217 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2218 // Mask out pending FLT exceptions
2219 ctx->FloatSave.StatusWord &= 0xffffff00;
2220 return EXCEPTION_CONTINUE_EXECUTION;
2221 }
2222 }
2223
2224 if (prev_uef_handler != NULL) {
2225 // We didn't handle this exception so pass it to the previous
2226 // UnhandledExceptionFilter.
2227 return (prev_uef_handler)(exceptionInfo);
2228 }
2229
2230 return EXCEPTION_CONTINUE_SEARCH;
2231 }
2232 #else //_WIN64
2233 /*
2234 On Windows, the mxcsr control bits are non-volatile across calls
2235 See also CR 6192333
2236 If EXCEPTION_FLT_* happened after some native method modified
2237 mxcsr - it is not a jvm fault.
2238 However should we decide to restore of mxcsr after a faulty
2239 native method we can uncomment following code
2240 jint MxCsr = INITIAL_MXCSR;
2241 // we can't use StubRoutines::addr_mxcsr_std()
2242 // because in Win64 mxcsr is not saved there
2243 if (MxCsr != ctx->MxCsr) {
2244 ctx->MxCsr = MxCsr;
2245 return EXCEPTION_CONTINUE_EXECUTION;
2246 }
2247
2248 */
2249 #endif //_WIN64
2250
2251
2252 // Fatal error reporting is single threaded so we can make this a
2253 // static and preallocated. If it's more than MAX_PATH silently ignore
2254 // it.
2255 static char saved_error_file[MAX_PATH] = {0};
2256
2257 void os::set_error_file(const char *logfile) {
2258 if (strlen(logfile) <= MAX_PATH) {
2259 strncpy(saved_error_file, logfile, MAX_PATH);
2260 }
2261 }
2262
2263 static inline void report_error(Thread* t, DWORD exception_code,
2264 address addr, void* siginfo, void* context) {
2265 VMError err(t, exception_code, addr, siginfo, context);
2266 err.report_and_die();
2267
2268 // If UseOsErrorReporting, this will return here and save the error file
2269 // somewhere where we can find it in the minidump.
2270 }
2271
2272 //-----------------------------------------------------------------------------
2273 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2274 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2275 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2276 #ifdef _M_IA64
2277 // On Itanium, we need the "precise pc", which has the slot number coded
2278 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2279 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2280 // Convert the pc to "Unix format", which has the slot number coded
2281 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2282 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2283 // information is saved in the Unix format.
2284 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2285 #elif _M_AMD64
2286 address pc = (address) exceptionInfo->ContextRecord->Rip;
2287 #else
2288 address pc = (address) exceptionInfo->ContextRecord->Eip;
2289 #endif
2290 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2291
2292 #ifndef _WIN64
2293 // Execution protection violation - win32 running on AMD64 only
2294 // Handled first to avoid misdiagnosis as a "normal" access violation;
2295 // This is safe to do because we have a new/unique ExceptionInformation
2296 // code for this condition.
2297 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2298 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2299 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2300 address addr = (address) exceptionRecord->ExceptionInformation[1];
2301
2302 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2303 int page_size = os::vm_page_size();
2304
2305 // Make sure the pc and the faulting address are sane.
2306 //
2307 // If an instruction spans a page boundary, and the page containing
2308 // the beginning of the instruction is executable but the following
2309 // page is not, the pc and the faulting address might be slightly
2310 // different - we still want to unguard the 2nd page in this case.
2311 //
2312 // 15 bytes seems to be a (very) safe value for max instruction size.
2313 bool pc_is_near_addr =
2314 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2315 bool instr_spans_page_boundary =
2316 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2317 (intptr_t) page_size) > 0);
2318
2319 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2320 static volatile address last_addr =
2321 (address) os::non_memory_address_word();
2322
2323 // In conservative mode, don't unguard unless the address is in the VM
2324 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2325 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2326
2327 // Set memory to RWX and retry
2328 address page_start =
2329 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2330 bool res = os::protect_memory((char*) page_start, page_size,
2331 os::MEM_PROT_RWX);
2332
2333 if (PrintMiscellaneous && Verbose) {
2334 char buf[256];
2335 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2336 "at " INTPTR_FORMAT
2337 ", unguarding " INTPTR_FORMAT ": %s", addr,
2338 page_start, (res ? "success" : strerror(errno)));
2339 tty->print_raw_cr(buf);
2340 }
2341
2342 // Set last_addr so if we fault again at the same address, we don't
2343 // end up in an endless loop.
2344 //
2345 // There are two potential complications here. Two threads trapping
2346 // at the same address at the same time could cause one of the
2347 // threads to think it already unguarded, and abort the VM. Likely
2348 // very rare.
2349 //
2350 // The other race involves two threads alternately trapping at
2351 // different addresses and failing to unguard the page, resulting in
2352 // an endless loop. This condition is probably even more unlikely
2353 // than the first.
2354 //
2355 // Although both cases could be avoided by using locks or thread
2356 // local last_addr, these solutions are unnecessary complication:
2357 // this handler is a best-effort safety net, not a complete solution.
2358 // It is disabled by default and should only be used as a workaround
2359 // in case we missed any no-execute-unsafe VM code.
2360
2361 last_addr = addr;
2362
2363 return EXCEPTION_CONTINUE_EXECUTION;
2364 }
2365 }
2366
2367 // Last unguard failed or not unguarding
2368 tty->print_raw_cr("Execution protection violation");
2369 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2370 exceptionInfo->ContextRecord);
2371 return EXCEPTION_CONTINUE_SEARCH;
2372 }
2373 }
2374 #endif // _WIN64
2375
2376 // Check to see if we caught the safepoint code in the
2377 // process of write protecting the memory serialization page.
2378 // It write enables the page immediately after protecting it
2379 // so just return.
2380 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2381 JavaThread* thread = (JavaThread*) t;
2382 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2383 address addr = (address) exceptionRecord->ExceptionInformation[1];
2384 if ( os::is_memory_serialize_page(thread, addr) ) {
2385 // Block current thread until the memory serialize page permission restored.
2386 os::block_on_serialize_page_trap();
2387 return EXCEPTION_CONTINUE_EXECUTION;
2388 }
2389 }
2390
2391 if (t != NULL && t->is_Java_thread()) {
2392 JavaThread* thread = (JavaThread*) t;
2393 bool in_java = thread->thread_state() == _thread_in_Java;
2394
2395 // Handle potential stack overflows up front.
2396 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2397 if (os::uses_stack_guard_pages()) {
2398 #ifdef _M_IA64
2399 // Use guard page for register stack.
2400 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2401 address addr = (address) exceptionRecord->ExceptionInformation[1];
2402 // Check for a register stack overflow on Itanium
2403 if (thread->addr_inside_register_stack_red_zone(addr)) {
2404 // Fatal red zone violation happens if the Java program
2405 // catches a StackOverflow error and does so much processing
2406 // that it runs beyond the unprotected yellow guard zone. As
2407 // a result, we are out of here.
2408 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2409 } else if(thread->addr_inside_register_stack(addr)) {
2410 // Disable the yellow zone which sets the state that
2411 // we've got a stack overflow problem.
2412 if (thread->stack_yellow_zone_enabled()) {
2413 thread->disable_stack_yellow_zone();
2414 }
2415 // Give us some room to process the exception.
2416 thread->disable_register_stack_guard();
2417 // Tracing with +Verbose.
2418 if (Verbose) {
2419 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2420 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2421 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2422 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2423 thread->register_stack_base(),
2424 thread->register_stack_base() + thread->stack_size());
2425 }
2426
2427 // Reguard the permanent register stack red zone just to be sure.
2428 // We saw Windows silently disabling this without telling us.
2429 thread->enable_register_stack_red_zone();
2430
2431 return Handle_Exception(exceptionInfo,
2432 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2433 }
2434 #endif
2435 if (thread->stack_yellow_zone_enabled()) {
2436 // Yellow zone violation. The o/s has unprotected the first yellow
2437 // zone page for us. Note: must call disable_stack_yellow_zone to
2438 // update the enabled status, even if the zone contains only one page.
2439 thread->disable_stack_yellow_zone();
2440 // If not in java code, return and hope for the best.
2441 return in_java ? Handle_Exception(exceptionInfo,
2442 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2443 : EXCEPTION_CONTINUE_EXECUTION;
2444 } else {
2445 // Fatal red zone violation.
2446 thread->disable_stack_red_zone();
2447 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2448 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2449 exceptionInfo->ContextRecord);
2450 return EXCEPTION_CONTINUE_SEARCH;
2451 }
2452 } else if (in_java) {
2453 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2454 // a one-time-only guard page, which it has released to us. The next
2455 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2456 return Handle_Exception(exceptionInfo,
2457 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2458 } else {
2459 // Can only return and hope for the best. Further stack growth will
2460 // result in an ACCESS_VIOLATION.
2461 return EXCEPTION_CONTINUE_EXECUTION;
2462 }
2463 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2464 // Either stack overflow or null pointer exception.
2465 if (in_java) {
2466 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2467 address addr = (address) exceptionRecord->ExceptionInformation[1];
2468 address stack_end = thread->stack_base() - thread->stack_size();
2469 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2470 // Stack overflow.
2471 assert(!os::uses_stack_guard_pages(),
2472 "should be caught by red zone code above.");
2473 return Handle_Exception(exceptionInfo,
2474 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2475 }
2476 //
2477 // Check for safepoint polling and implicit null
2478 // We only expect null pointers in the stubs (vtable)
2479 // the rest are checked explicitly now.
2480 //
2481 CodeBlob* cb = CodeCache::find_blob(pc);
2482 if (cb != NULL) {
2483 if (os::is_poll_address(addr)) {
2484 address stub = SharedRuntime::get_poll_stub(pc);
2485 return Handle_Exception(exceptionInfo, stub);
2486 }
2487 }
2488 {
2489 #ifdef _WIN64
2490 //
2491 // If it's a legal stack address map the entire region in
2492 //
2493 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2494 address addr = (address) exceptionRecord->ExceptionInformation[1];
2495 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2496 addr = (address)((uintptr_t)addr &
2497 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2498 os::commit_memory((char *)addr, thread->stack_base() - addr,
2499 false );
2500 return EXCEPTION_CONTINUE_EXECUTION;
2501 }
2502 else
2503 #endif
2504 {
2505 // Null pointer exception.
2506 #ifdef _M_IA64
2507 // Process implicit null checks in compiled code. Note: Implicit null checks
2508 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2509 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2510 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2511 // Handle implicit null check in UEP method entry
2512 if (cb && (cb->is_frame_complete_at(pc) ||
2513 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2514 if (Verbose) {
2515 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2516 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2517 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2518 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2519 *(bundle_start + 1), *bundle_start);
2520 }
2521 return Handle_Exception(exceptionInfo,
2522 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2523 }
2524 }
2525
2526 // Implicit null checks were processed above. Hence, we should not reach
2527 // here in the usual case => die!
2528 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2529 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2530 exceptionInfo->ContextRecord);
2531 return EXCEPTION_CONTINUE_SEARCH;
2532
2533 #else // !IA64
2534
2535 // Windows 98 reports faulting addresses incorrectly
2536 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2537 !os::win32::is_nt()) {
2538 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2539 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2540 }
2541 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2542 exceptionInfo->ContextRecord);
2543 return EXCEPTION_CONTINUE_SEARCH;
2544 #endif
2545 }
2546 }
2547 }
2548
2549 #ifdef _WIN64
2550 // Special care for fast JNI field accessors.
2551 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2552 // in and the heap gets shrunk before the field access.
2553 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2554 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2555 if (addr != (address)-1) {
2556 return Handle_Exception(exceptionInfo, addr);
2557 }
2558 }
2559 #endif
2560
2561 // Stack overflow or null pointer exception in native code.
2562 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2563 exceptionInfo->ContextRecord);
2564 return EXCEPTION_CONTINUE_SEARCH;
2565 } // /EXCEPTION_ACCESS_VIOLATION
2566 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2567 #if defined _M_IA64
2568 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2569 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2570 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2571
2572 // Compiled method patched to be non entrant? Following conditions must apply:
2573 // 1. must be first instruction in bundle
2574 // 2. must be a break instruction with appropriate code
2575 if((((uint64_t) pc & 0x0F) == 0) &&
2576 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2577 return Handle_Exception(exceptionInfo,
2578 (address)SharedRuntime::get_handle_wrong_method_stub());
2579 }
2580 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2581 #endif
2582
2583
2584 if (in_java) {
2585 switch (exception_code) {
2586 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2587 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2588
2589 case EXCEPTION_INT_OVERFLOW:
2590 return Handle_IDiv_Exception(exceptionInfo);
2591
2592 } // switch
2593 }
2594 #ifndef _WIN64
2595 if (((thread->thread_state() == _thread_in_Java) ||
2596 (thread->thread_state() == _thread_in_native)) &&
2597 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2598 {
2599 LONG result=Handle_FLT_Exception(exceptionInfo);
2600 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2601 }
2602 #endif //_WIN64
2603 }
2604
2605 if (exception_code != EXCEPTION_BREAKPOINT) {
2606 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2607 exceptionInfo->ContextRecord);
2608 }
2609 return EXCEPTION_CONTINUE_SEARCH;
2610 }
2611
2612 #ifndef _WIN64
2613 // Special care for fast JNI accessors.
2614 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2615 // the heap gets shrunk before the field access.
2616 // Need to install our own structured exception handler since native code may
2617 // install its own.
2618 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2619 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2620 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2621 address pc = (address) exceptionInfo->ContextRecord->Eip;
2622 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2623 if (addr != (address)-1) {
2624 return Handle_Exception(exceptionInfo, addr);
2625 }
2626 }
2627 return EXCEPTION_CONTINUE_SEARCH;
2628 }
2629
2630 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2631 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2632 __try { \
2633 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2634 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2635 } \
2636 return 0; \
2637 }
2638
2639 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2640 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2641 DEFINE_FAST_GETFIELD(jchar, char, Char)
2642 DEFINE_FAST_GETFIELD(jshort, short, Short)
2643 DEFINE_FAST_GETFIELD(jint, int, Int)
2644 DEFINE_FAST_GETFIELD(jlong, long, Long)
2645 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2646 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2647
2648 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2649 switch (type) {
2650 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2651 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2652 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2653 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2654 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2655 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2656 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2657 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2658 default: ShouldNotReachHere();
2659 }
2660 return (address)-1;
2661 }
2662 #endif
2663
2664 // Virtual Memory
2665
2666 int os::vm_page_size() { return os::win32::vm_page_size(); }
2667 int os::vm_allocation_granularity() {
2668 return os::win32::vm_allocation_granularity();
2669 }
2670
2671 // Windows large page support is available on Windows 2003. In order to use
2672 // large page memory, the administrator must first assign additional privilege
2673 // to the user:
2674 // + select Control Panel -> Administrative Tools -> Local Security Policy
2675 // + select Local Policies -> User Rights Assignment
2676 // + double click "Lock pages in memory", add users and/or groups
2677 // + reboot
2678 // Note the above steps are needed for administrator as well, as administrators
2679 // by default do not have the privilege to lock pages in memory.
2680 //
2681 // Note about Windows 2003: although the API supports committing large page
2682 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2683 // scenario, I found through experiment it only uses large page if the entire
2684 // memory region is reserved and committed in a single VirtualAlloc() call.
2685 // This makes Windows large page support more or less like Solaris ISM, in
2686 // that the entire heap must be committed upfront. This probably will change
2687 // in the future, if so the code below needs to be revisited.
2688
2689 #ifndef MEM_LARGE_PAGES
2690 #define MEM_LARGE_PAGES 0x20000000
2691 #endif
2692
2693 static HANDLE _hProcess;
2694 static HANDLE _hToken;
2695
2696 // Container for NUMA node list info
2697 class NUMANodeListHolder {
2698 private:
2699 int *_numa_used_node_list; // allocated below
2700 int _numa_used_node_count;
2701
2702 void free_node_list() {
2703 if (_numa_used_node_list != NULL) {
2704 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2705 }
2706 }
2707
2708 public:
2709 NUMANodeListHolder() {
2710 _numa_used_node_count = 0;
2711 _numa_used_node_list = NULL;
2712 // do rest of initialization in build routine (after function pointers are set up)
2713 }
2714
2715 ~NUMANodeListHolder() {
2716 free_node_list();
2717 }
2718
2719 bool build() {
2720 DWORD_PTR proc_aff_mask;
2721 DWORD_PTR sys_aff_mask;
2722 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2723 ULONG highest_node_number;
2724 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2725 free_node_list();
2726 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2727 for (unsigned int i = 0; i <= highest_node_number; i++) {
2728 ULONGLONG proc_mask_numa_node;
2729 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2730 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2731 _numa_used_node_list[_numa_used_node_count++] = i;
2732 }
2733 }
2734 return (_numa_used_node_count > 1);
2735 }
2736
2737 int get_count() {return _numa_used_node_count;}
2738 int get_node_list_entry(int n) {
2739 // for indexes out of range, returns -1
2740 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2741 }
2742
2743 } numa_node_list_holder;
2744
2745
2746
2747 static size_t _large_page_size = 0;
2748
2749 static bool resolve_functions_for_large_page_init() {
2750 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2751 os::Advapi32Dll::AdvapiAvailable();
2752 }
2753
2754 static bool request_lock_memory_privilege() {
2755 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2756 os::current_process_id());
2757
2758 LUID luid;
2759 if (_hProcess != NULL &&
2760 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2761 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2762
2763 TOKEN_PRIVILEGES tp;
2764 tp.PrivilegeCount = 1;
2765 tp.Privileges[0].Luid = luid;
2766 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2767
2768 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2769 // privilege. Check GetLastError() too. See MSDN document.
2770 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2771 (GetLastError() == ERROR_SUCCESS)) {
2772 return true;
2773 }
2774 }
2775
2776 return false;
2777 }
2778
2779 static void cleanup_after_large_page_init() {
2780 if (_hProcess) CloseHandle(_hProcess);
2781 _hProcess = NULL;
2782 if (_hToken) CloseHandle(_hToken);
2783 _hToken = NULL;
2784 }
2785
2786 static bool numa_interleaving_init() {
2787 bool success = false;
2788 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2789
2790 // print a warning if UseNUMAInterleaving flag is specified on command line
2791 bool warn_on_failure = use_numa_interleaving_specified;
2792 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2793
2794 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2795 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2796 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2797
2798 if (os::Kernel32Dll::NumaCallsAvailable()) {
2799 if (numa_node_list_holder.build()) {
2800 if (PrintMiscellaneous && Verbose) {
2801 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2802 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2803 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2804 }
2805 tty->print("\n");
2806 }
2807 success = true;
2808 } else {
2809 WARN("Process does not cover multiple NUMA nodes.");
2810 }
2811 } else {
2812 WARN("NUMA Interleaving is not supported by the operating system.");
2813 }
2814 if (!success) {
2815 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2816 }
2817 return success;
2818 #undef WARN
2819 }
2820
2821 // this routine is used whenever we need to reserve a contiguous VA range
2822 // but we need to make separate VirtualAlloc calls for each piece of the range
2823 // Reasons for doing this:
2824 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2825 // * UseNUMAInterleaving requires a separate node for each piece
2826 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2827 bool should_inject_error=false) {
2828 char * p_buf;
2829 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2830 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2831 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2832
2833 // first reserve enough address space in advance since we want to be
2834 // able to break a single contiguous virtual address range into multiple
2835 // large page commits but WS2003 does not allow reserving large page space
2836 // so we just use 4K pages for reserve, this gives us a legal contiguous
2837 // address space. then we will deallocate that reservation, and re alloc
2838 // using large pages
2839 const size_t size_of_reserve = bytes + chunk_size;
2840 if (bytes > size_of_reserve) {
2841 // Overflowed.
2842 return NULL;
2843 }
2844 p_buf = (char *) VirtualAlloc(addr,
2845 size_of_reserve, // size of Reserve
2846 MEM_RESERVE,
2847 PAGE_READWRITE);
2848 // If reservation failed, return NULL
2849 if (p_buf == NULL) return NULL;
2850 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2851 os::release_memory(p_buf, bytes + chunk_size);
2852
2853 // we still need to round up to a page boundary (in case we are using large pages)
2854 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2855 // instead we handle this in the bytes_to_rq computation below
2856 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2857
2858 // now go through and allocate one chunk at a time until all bytes are
2859 // allocated
2860 size_t bytes_remaining = bytes;
2861 // An overflow of align_size_up() would have been caught above
2862 // in the calculation of size_of_reserve.
2863 char * next_alloc_addr = p_buf;
2864 HANDLE hProc = GetCurrentProcess();
2865
2866 #ifdef ASSERT
2867 // Variable for the failure injection
2868 long ran_num = os::random();
2869 size_t fail_after = ran_num % bytes;
2870 #endif
2871
2872 int count=0;
2873 while (bytes_remaining) {
2874 // select bytes_to_rq to get to the next chunk_size boundary
2875
2876 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2877 // Note allocate and commit
2878 char * p_new;
2879
2880 #ifdef ASSERT
2881 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2882 #else
2883 const bool inject_error_now = false;
2884 #endif
2885
2886 if (inject_error_now) {
2887 p_new = NULL;
2888 } else {
2889 if (!UseNUMAInterleaving) {
2890 p_new = (char *) VirtualAlloc(next_alloc_addr,
2891 bytes_to_rq,
2892 flags,
2893 prot);
2894 } else {
2895 // get the next node to use from the used_node_list
2896 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2897 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2898 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2899 next_alloc_addr,
2900 bytes_to_rq,
2901 flags,
2902 prot,
2903 node);
2904 }
2905 }
2906
2907 if (p_new == NULL) {
2908 // Free any allocated pages
2909 if (next_alloc_addr > p_buf) {
2910 // Some memory was committed so release it.
2911 size_t bytes_to_release = bytes - bytes_remaining;
2912 // NMT has yet to record any individual blocks, so it
2913 // need to create a dummy 'reserve' record to match
2914 // the release.
2915 MemTracker::record_virtual_memory_reserve((address)p_buf,
2916 bytes_to_release, CALLER_PC);
2917 os::release_memory(p_buf, bytes_to_release);
2918 }
2919 #ifdef ASSERT
2920 if (should_inject_error) {
2921 if (TracePageSizes && Verbose) {
2922 tty->print_cr("Reserving pages individually failed.");
2923 }
2924 }
2925 #endif
2926 return NULL;
2927 }
2928
2929 bytes_remaining -= bytes_to_rq;
2930 next_alloc_addr += bytes_to_rq;
2931 count++;
2932 }
2933 // Although the memory is allocated individually, it is returned as one.
2934 // NMT records it as one block.
2935 address pc = CALLER_PC;
2936 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, pc);
2937 if ((flags & MEM_COMMIT) != 0) {
2938 MemTracker::record_virtual_memory_commit((address)p_buf, bytes, pc);
2939 }
2940
2941 // made it this far, success
2942 return p_buf;
2943 }
2944
2945
2946
2947 void os::large_page_init() {
2948 if (!UseLargePages) return;
2949
2950 // print a warning if any large page related flag is specified on command line
2951 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2952 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2953 bool success = false;
2954
2955 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2956 if (resolve_functions_for_large_page_init()) {
2957 if (request_lock_memory_privilege()) {
2958 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2959 if (s) {
2960 #if defined(IA32) || defined(AMD64)
2961 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2962 WARN("JVM cannot use large pages bigger than 4mb.");
2963 } else {
2964 #endif
2965 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2966 _large_page_size = LargePageSizeInBytes;
2967 } else {
2968 _large_page_size = s;
2969 }
2970 success = true;
2971 #if defined(IA32) || defined(AMD64)
2972 }
2973 #endif
2974 } else {
2975 WARN("Large page is not supported by the processor.");
2976 }
2977 } else {
2978 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2979 }
2980 } else {
2981 WARN("Large page is not supported by the operating system.");
2982 }
2983 #undef WARN
2984
2985 const size_t default_page_size = (size_t) vm_page_size();
2986 if (success && _large_page_size > default_page_size) {
2987 _page_sizes[0] = _large_page_size;
2988 _page_sizes[1] = default_page_size;
2989 _page_sizes[2] = 0;
2990 }
2991
2992 cleanup_after_large_page_init();
2993 UseLargePages = success;
2994 }
2995
2996 // On win32, one cannot release just a part of reserved memory, it's an
2997 // all or nothing deal. When we split a reservation, we must break the
2998 // reservation into two reservations.
2999 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3000 bool realloc) {
3001 if (size > 0) {
3002 release_memory(base, size);
3003 if (realloc) {
3004 reserve_memory(split, base);
3005 }
3006 if (size != split) {
3007 reserve_memory(size - split, base + split);
3008 }
3009 }
3010 }
3011
3012 // Multiple threads can race in this code but it's not possible to unmap small sections of
3013 // virtual space to get requested alignment, like posix-like os's.
3014 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3015 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3016 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3017 "Alignment must be a multiple of allocation granularity (page size)");
3018 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3019
3020 size_t extra_size = size + alignment;
3021 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3022
3023 char* aligned_base = NULL;
3024
3025 do {
3026 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3027 if (extra_base == NULL) {
3028 return NULL;
3029 }
3030 // Do manual alignment
3031 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3032
3033 os::release_memory(extra_base, extra_size);
3034
3035 aligned_base = os::reserve_memory(size, aligned_base);
3036
3037 } while (aligned_base == NULL);
3038
3039 return aligned_base;
3040 }
3041
3042 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3043 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3044 "reserve alignment");
3045 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3046 char* res;
3047 // note that if UseLargePages is on, all the areas that require interleaving
3048 // will go thru reserve_memory_special rather than thru here.
3049 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3050 if (!use_individual) {
3051 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3052 } else {
3053 elapsedTimer reserveTimer;
3054 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3055 // in numa interleaving, we have to allocate pages individually
3056 // (well really chunks of NUMAInterleaveGranularity size)
3057 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3058 if (res == NULL) {
3059 warning("NUMA page allocation failed");
3060 }
3061 if( Verbose && PrintMiscellaneous ) {
3062 reserveTimer.stop();
3063 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3064 reserveTimer.milliseconds(), reserveTimer.ticks());
3065 }
3066 }
3067 assert(res == NULL || addr == NULL || addr == res,
3068 "Unexpected address from reserve.");
3069
3070 return res;
3071 }
3072
3073 // Reserve memory at an arbitrary address, only if that area is
3074 // available (and not reserved for something else).
3075 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3076 // Windows os::reserve_memory() fails of the requested address range is
3077 // not avilable.
3078 return reserve_memory(bytes, requested_addr);
3079 }
3080
3081 size_t os::large_page_size() {
3082 return _large_page_size;
3083 }
3084
3085 bool os::can_commit_large_page_memory() {
3086 // Windows only uses large page memory when the entire region is reserved
3087 // and committed in a single VirtualAlloc() call. This may change in the
3088 // future, but with Windows 2003 it's not possible to commit on demand.
3089 return false;
3090 }
3091
3092 bool os::can_execute_large_page_memory() {
3093 return true;
3094 }
3095
3096 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3097
3098 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3099 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3100
3101 // with large pages, there are two cases where we need to use Individual Allocation
3102 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3103 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3104 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3105 if (TracePageSizes && Verbose) {
3106 tty->print_cr("Reserving large pages individually.");
3107 }
3108 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3109 if (p_buf == NULL) {
3110 // give an appropriate warning message
3111 if (UseNUMAInterleaving) {
3112 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3113 }
3114 if (UseLargePagesIndividualAllocation) {
3115 warning("Individually allocated large pages failed, "
3116 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3117 }
3118 return NULL;
3119 }
3120
3121 return p_buf;
3122
3123 } else {
3124 // normal policy just allocate it all at once
3125 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3126 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3127 if (res != NULL) {
3128 address pc = CALLER_PC;
3129 MemTracker::record_virtual_memory_reserve((address)res, bytes, pc);
3130 MemTracker::record_virtual_memory_commit((address)res, bytes, pc);
3131 }
3132
3133 return res;
3134 }
3135 }
3136
3137 bool os::release_memory_special(char* base, size_t bytes) {
3138 assert(base != NULL, "Sanity check");
3139 // Memory allocated via reserve_memory_special() is committed
3140 MemTracker::record_virtual_memory_uncommit((address)base, bytes);
3141 return release_memory(base, bytes);
3142 }
3143
3144 void os::print_statistics() {
3145 }
3146
3147 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3148 if (bytes == 0) {
3149 // Don't bother the OS with noops.
3150 return true;
3151 }
3152 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3153 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3154 // Don't attempt to print anything if the OS call fails. We're
3155 // probably low on resources, so the print itself may cause crashes.
3156
3157 // unless we have NUMAInterleaving enabled, the range of a commit
3158 // is always within a reserve covered by a single VirtualAlloc
3159 // in that case we can just do a single commit for the requested size
3160 if (!UseNUMAInterleaving) {
3161 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3162 if (exec) {
3163 DWORD oldprot;
3164 // Windows doc says to use VirtualProtect to get execute permissions
3165 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3166 }
3167 return true;
3168 } else {
3169
3170 // when NUMAInterleaving is enabled, the commit might cover a range that
3171 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3172 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3173 // returns represents the number of bytes that can be committed in one step.
3174 size_t bytes_remaining = bytes;
3175 char * next_alloc_addr = addr;
3176 while (bytes_remaining > 0) {
3177 MEMORY_BASIC_INFORMATION alloc_info;
3178 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3179 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3180 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3181 return false;
3182 if (exec) {
3183 DWORD oldprot;
3184 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3185 return false;
3186 }
3187 bytes_remaining -= bytes_to_rq;
3188 next_alloc_addr += bytes_to_rq;
3189 }
3190 }
3191 // if we made it this far, return true
3192 return true;
3193 }
3194
3195 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3196 bool exec) {
3197 return commit_memory(addr, size, exec);
3198 }
3199
3200 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3201 if (bytes == 0) {
3202 // Don't bother the OS with noops.
3203 return true;
3204 }
3205 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3206 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3207 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3208 }
3209
3210 bool os::pd_release_memory(char* addr, size_t bytes) {
3211 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3212 }
3213
3214 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3215 return os::commit_memory(addr, size);
3216 }
3217
3218 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3219 return os::uncommit_memory(addr, size);
3220 }
3221
3222 // Set protections specified
3223 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3224 bool is_committed) {
3225 unsigned int p = 0;
3226 switch (prot) {
3227 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3228 case MEM_PROT_READ: p = PAGE_READONLY; break;
3229 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3230 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3231 default:
3232 ShouldNotReachHere();
3233 }
3234
3235 DWORD old_status;
3236
3237 // Strange enough, but on Win32 one can change protection only for committed
3238 // memory, not a big deal anyway, as bytes less or equal than 64K
3239 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3240 fatal("cannot commit protection page");
3241 }
3242 // One cannot use os::guard_memory() here, as on Win32 guard page
3243 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3244 //
3245 // Pages in the region become guard pages. Any attempt to access a guard page
3246 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3247 // the guard page status. Guard pages thus act as a one-time access alarm.
3248 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3249 }
3250
3251 bool os::guard_memory(char* addr, size_t bytes) {
3252 DWORD old_status;
3253 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3254 }
3255
3256 bool os::unguard_memory(char* addr, size_t bytes) {
3257 DWORD old_status;
3258 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3259 }
3260
3261 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3262 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3263 void os::numa_make_global(char *addr, size_t bytes) { }
3264 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3265 bool os::numa_topology_changed() { return false; }
3266 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3267 int os::numa_get_group_id() { return 0; }
3268 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3269 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3270 // Provide an answer for UMA systems
3271 ids[0] = 0;
3272 return 1;
3273 } else {
3274 // check for size bigger than actual groups_num
3275 size = MIN2(size, numa_get_groups_num());
3276 for (int i = 0; i < (int)size; i++) {
3277 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3278 }
3279 return size;
3280 }
3281 }
3282
3283 bool os::get_page_info(char *start, page_info* info) {
3284 return false;
3285 }
3286
3287 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3288 return end;
3289 }
3290
3291 char* os::non_memory_address_word() {
3292 // Must never look like an address returned by reserve_memory,
3293 // even in its subfields (as defined by the CPU immediate fields,
3294 // if the CPU splits constants across multiple instructions).
3295 return (char*)-1;
3296 }
3297
3298 #define MAX_ERROR_COUNT 100
3299 #define SYS_THREAD_ERROR 0xffffffffUL
3300
3301 void os::pd_start_thread(Thread* thread) {
3302 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3303 // Returns previous suspend state:
3304 // 0: Thread was not suspended
3305 // 1: Thread is running now
3306 // >1: Thread is still suspended.
3307 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3308 }
3309
3310 class HighResolutionInterval {
3311 // The default timer resolution seems to be 10 milliseconds.
3312 // (Where is this written down?)
3313 // If someone wants to sleep for only a fraction of the default,
3314 // then we set the timer resolution down to 1 millisecond for
3315 // the duration of their interval.
3316 // We carefully set the resolution back, since otherwise we
3317 // seem to incur an overhead (3%?) that we don't need.
3318 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3319 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3320 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3321 // timeBeginPeriod() if the relative error exceeded some threshold.
3322 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3323 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3324 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3325 // resolution timers running.
3326 private:
3327 jlong resolution;
3328 public:
3329 HighResolutionInterval(jlong ms) {
3330 resolution = ms % 10L;
3331 if (resolution != 0) {
3332 MMRESULT result = timeBeginPeriod(1L);
3333 }
3334 }
3335 ~HighResolutionInterval() {
3336 if (resolution != 0) {
3337 MMRESULT result = timeEndPeriod(1L);
3338 }
3339 resolution = 0L;
3340 }
3341 };
3342
3343 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3344 jlong limit = (jlong) MAXDWORD;
3345
3346 while(ms > limit) {
3347 int res;
3348 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3349 return res;
3350 ms -= limit;
3351 }
3352
3353 assert(thread == Thread::current(), "thread consistency check");
3354 OSThread* osthread = thread->osthread();
3355 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3356 int result;
3357 if (interruptable) {
3358 assert(thread->is_Java_thread(), "must be java thread");
3359 JavaThread *jt = (JavaThread *) thread;
3360 ThreadBlockInVM tbivm(jt);
3361
3362 jt->set_suspend_equivalent();
3363 // cleared by handle_special_suspend_equivalent_condition() or
3364 // java_suspend_self() via check_and_wait_while_suspended()
3365
3366 HANDLE events[1];
3367 events[0] = osthread->interrupt_event();
3368 HighResolutionInterval *phri=NULL;
3369 if(!ForceTimeHighResolution)
3370 phri = new HighResolutionInterval( ms );
3371 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3372 result = OS_TIMEOUT;
3373 } else {
3374 ResetEvent(osthread->interrupt_event());
3375 osthread->set_interrupted(false);
3376 result = OS_INTRPT;
3377 }
3378 delete phri; //if it is NULL, harmless
3379
3380 // were we externally suspended while we were waiting?
3381 jt->check_and_wait_while_suspended();
3382 } else {
3383 assert(!thread->is_Java_thread(), "must not be java thread");
3384 Sleep((long) ms);
3385 result = OS_TIMEOUT;
3386 }
3387 return result;
3388 }
3389
3390 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3391 void os::infinite_sleep() {
3392 while (true) { // sleep forever ...
3393 Sleep(100000); // ... 100 seconds at a time
3394 }
3395 }
3396
3397 typedef BOOL (WINAPI * STTSignature)(void) ;
3398
3399 os::YieldResult os::NakedYield() {
3400 // Use either SwitchToThread() or Sleep(0)
3401 // Consider passing back the return value from SwitchToThread().
3402 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3403 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3404 } else {
3405 Sleep(0);
3406 }
3407 return os::YIELD_UNKNOWN ;
3408 }
3409
3410 void os::yield() { os::NakedYield(); }
3411
3412 void os::yield_all(int attempts) {
3413 // Yields to all threads, including threads with lower priorities
3414 Sleep(1);
3415 }
3416
3417 // Win32 only gives you access to seven real priorities at a time,
3418 // so we compress Java's ten down to seven. It would be better
3419 // if we dynamically adjusted relative priorities.
3420
3421 int os::java_to_os_priority[CriticalPriority + 1] = {
3422 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3423 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3424 THREAD_PRIORITY_LOWEST, // 2
3425 THREAD_PRIORITY_BELOW_NORMAL, // 3
3426 THREAD_PRIORITY_BELOW_NORMAL, // 4
3427 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3428 THREAD_PRIORITY_NORMAL, // 6
3429 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3430 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3431 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3432 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3433 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3434 };
3435
3436 int prio_policy1[CriticalPriority + 1] = {
3437 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3438 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3439 THREAD_PRIORITY_LOWEST, // 2
3440 THREAD_PRIORITY_BELOW_NORMAL, // 3
3441 THREAD_PRIORITY_BELOW_NORMAL, // 4
3442 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3443 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3444 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3445 THREAD_PRIORITY_HIGHEST, // 8
3446 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3447 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3448 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3449 };
3450
3451 static int prio_init() {
3452 // If ThreadPriorityPolicy is 1, switch tables
3453 if (ThreadPriorityPolicy == 1) {
3454 int i;
3455 for (i = 0; i < CriticalPriority + 1; i++) {
3456 os::java_to_os_priority[i] = prio_policy1[i];
3457 }
3458 }
3459 if (UseCriticalJavaThreadPriority) {
3460 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3461 }
3462 return 0;
3463 }
3464
3465 OSReturn os::set_native_priority(Thread* thread, int priority) {
3466 if (!UseThreadPriorities) return OS_OK;
3467 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3468 return ret ? OS_OK : OS_ERR;
3469 }
3470
3471 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3472 if ( !UseThreadPriorities ) {
3473 *priority_ptr = java_to_os_priority[NormPriority];
3474 return OS_OK;
3475 }
3476 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3477 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3478 assert(false, "GetThreadPriority failed");
3479 return OS_ERR;
3480 }
3481 *priority_ptr = os_prio;
3482 return OS_OK;
3483 }
3484
3485
3486 // Hint to the underlying OS that a task switch would not be good.
3487 // Void return because it's a hint and can fail.
3488 void os::hint_no_preempt() {}
3489
3490 void os::interrupt(Thread* thread) {
3491 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3492 "possibility of dangling Thread pointer");
3493
3494 OSThread* osthread = thread->osthread();
3495 osthread->set_interrupted(true);
3496 // More than one thread can get here with the same value of osthread,
3497 // resulting in multiple notifications. We do, however, want the store
3498 // to interrupted() to be visible to other threads before we post
3499 // the interrupt event.
3500 OrderAccess::release();
3501 SetEvent(osthread->interrupt_event());
3502 // For JSR166: unpark after setting status
3503 if (thread->is_Java_thread())
3504 ((JavaThread*)thread)->parker()->unpark();
3505
3506 ParkEvent * ev = thread->_ParkEvent ;
3507 if (ev != NULL) ev->unpark() ;
3508
3509 }
3510
3511
3512 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3513 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3514 "possibility of dangling Thread pointer");
3515
3516 OSThread* osthread = thread->osthread();
3517 bool interrupted = osthread->interrupted();
3518 // There is no synchronization between the setting of the interrupt
3519 // and it being cleared here. It is critical - see 6535709 - that
3520 // we only clear the interrupt state, and reset the interrupt event,
3521 // if we are going to report that we were indeed interrupted - else
3522 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3523 // depending on the timing
3524 if (interrupted && clear_interrupted) {
3525 osthread->set_interrupted(false);
3526 ResetEvent(osthread->interrupt_event());
3527 } // Otherwise leave the interrupted state alone
3528
3529 return interrupted;
3530 }
3531
3532 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3533 ExtendedPC os::get_thread_pc(Thread* thread) {
3534 CONTEXT context;
3535 context.ContextFlags = CONTEXT_CONTROL;
3536 HANDLE handle = thread->osthread()->thread_handle();
3537 #ifdef _M_IA64
3538 assert(0, "Fix get_thread_pc");
3539 return ExtendedPC(NULL);
3540 #else
3541 if (GetThreadContext(handle, &context)) {
3542 #ifdef _M_AMD64
3543 return ExtendedPC((address) context.Rip);
3544 #else
3545 return ExtendedPC((address) context.Eip);
3546 #endif
3547 } else {
3548 return ExtendedPC(NULL);
3549 }
3550 #endif
3551 }
3552
3553 // GetCurrentThreadId() returns DWORD
3554 intx os::current_thread_id() { return GetCurrentThreadId(); }
3555
3556 static int _initial_pid = 0;
3557
3558 int os::current_process_id()
3559 {
3560 return (_initial_pid ? _initial_pid : _getpid());
3561 }
3562
3563 int os::win32::_vm_page_size = 0;
3564 int os::win32::_vm_allocation_granularity = 0;
3565 int os::win32::_processor_type = 0;
3566 // Processor level is not available on non-NT systems, use vm_version instead
3567 int os::win32::_processor_level = 0;
3568 julong os::win32::_physical_memory = 0;
3569 size_t os::win32::_default_stack_size = 0;
3570
3571 intx os::win32::_os_thread_limit = 0;
3572 volatile intx os::win32::_os_thread_count = 0;
3573
3574 bool os::win32::_is_nt = false;
3575 bool os::win32::_is_windows_2003 = false;
3576 bool os::win32::_is_windows_server = false;
3577
3578 void os::win32::initialize_system_info() {
3579 SYSTEM_INFO si;
3580 GetSystemInfo(&si);
3581 _vm_page_size = si.dwPageSize;
3582 _vm_allocation_granularity = si.dwAllocationGranularity;
3583 _processor_type = si.dwProcessorType;
3584 _processor_level = si.wProcessorLevel;
3585 set_processor_count(si.dwNumberOfProcessors);
3586
3587 MEMORYSTATUSEX ms;
3588 ms.dwLength = sizeof(ms);
3589
3590 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3591 // dwMemoryLoad (% of memory in use)
3592 GlobalMemoryStatusEx(&ms);
3593 _physical_memory = ms.ullTotalPhys;
3594
3595 OSVERSIONINFOEX oi;
3596 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3597 GetVersionEx((OSVERSIONINFO*)&oi);
3598 switch(oi.dwPlatformId) {
3599 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3600 case VER_PLATFORM_WIN32_NT:
3601 _is_nt = true;
3602 {
3603 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3604 if (os_vers == 5002) {
3605 _is_windows_2003 = true;
3606 }
3607 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3608 oi.wProductType == VER_NT_SERVER) {
3609 _is_windows_server = true;
3610 }
3611 }
3612 break;
3613 default: fatal("Unknown platform");
3614 }
3615
3616 _default_stack_size = os::current_stack_size();
3617 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3618 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3619 "stack size not a multiple of page size");
3620
3621 initialize_performance_counter();
3622
3623 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3624 // known to deadlock the system, if the VM issues to thread operations with
3625 // a too high frequency, e.g., such as changing the priorities.
3626 // The 6000 seems to work well - no deadlocks has been notices on the test
3627 // programs that we have seen experience this problem.
3628 if (!os::win32::is_nt()) {
3629 StarvationMonitorInterval = 6000;
3630 }
3631 }
3632
3633
3634 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3635 char path[MAX_PATH];
3636 DWORD size;
3637 DWORD pathLen = (DWORD)sizeof(path);
3638 HINSTANCE result = NULL;
3639
3640 // only allow library name without path component
3641 assert(strchr(name, '\\') == NULL, "path not allowed");
3642 assert(strchr(name, ':') == NULL, "path not allowed");
3643 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3644 jio_snprintf(ebuf, ebuflen,
3645 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3646 return NULL;
3647 }
3648
3649 // search system directory
3650 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3651 strcat(path, "\\");
3652 strcat(path, name);
3653 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3654 return result;
3655 }
3656 }
3657
3658 // try Windows directory
3659 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3660 strcat(path, "\\");
3661 strcat(path, name);
3662 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3663 return result;
3664 }
3665 }
3666
3667 jio_snprintf(ebuf, ebuflen,
3668 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3669 return NULL;
3670 }
3671
3672 void os::win32::setmode_streams() {
3673 _setmode(_fileno(stdin), _O_BINARY);
3674 _setmode(_fileno(stdout), _O_BINARY);
3675 _setmode(_fileno(stderr), _O_BINARY);
3676 }
3677
3678
3679 bool os::is_debugger_attached() {
3680 return IsDebuggerPresent() ? true : false;
3681 }
3682
3683
3684 void os::wait_for_keypress_at_exit(void) {
3685 if (PauseAtExit) {
3686 fprintf(stderr, "Press any key to continue...\n");
3687 fgetc(stdin);
3688 }
3689 }
3690
3691
3692 int os::message_box(const char* title, const char* message) {
3693 int result = MessageBox(NULL, message, title,
3694 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3695 return result == IDYES;
3696 }
3697
3698 int os::allocate_thread_local_storage() {
3699 return TlsAlloc();
3700 }
3701
3702
3703 void os::free_thread_local_storage(int index) {
3704 TlsFree(index);
3705 }
3706
3707
3708 void os::thread_local_storage_at_put(int index, void* value) {
3709 TlsSetValue(index, value);
3710 assert(thread_local_storage_at(index) == value, "Just checking");
3711 }
3712
3713
3714 void* os::thread_local_storage_at(int index) {
3715 return TlsGetValue(index);
3716 }
3717
3718
3719 #ifndef PRODUCT
3720 #ifndef _WIN64
3721 // Helpers to check whether NX protection is enabled
3722 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3723 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3724 pex->ExceptionRecord->NumberParameters > 0 &&
3725 pex->ExceptionRecord->ExceptionInformation[0] ==
3726 EXCEPTION_INFO_EXEC_VIOLATION) {
3727 return EXCEPTION_EXECUTE_HANDLER;
3728 }
3729 return EXCEPTION_CONTINUE_SEARCH;
3730 }
3731
3732 void nx_check_protection() {
3733 // If NX is enabled we'll get an exception calling into code on the stack
3734 char code[] = { (char)0xC3 }; // ret
3735 void *code_ptr = (void *)code;
3736 __try {
3737 __asm call code_ptr
3738 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3739 tty->print_raw_cr("NX protection detected.");
3740 }
3741 }
3742 #endif // _WIN64
3743 #endif // PRODUCT
3744
3745 // this is called _before_ the global arguments have been parsed
3746 void os::init(void) {
3747 _initial_pid = _getpid();
3748
3749 init_random(1234567);
3750
3751 win32::initialize_system_info();
3752 win32::setmode_streams();
3753 init_page_sizes((size_t) win32::vm_page_size());
3754
3755 // For better scalability on MP systems (must be called after initialize_system_info)
3756 #ifndef PRODUCT
3757 if (is_MP()) {
3758 NoYieldsInMicrolock = true;
3759 }
3760 #endif
3761 // This may be overridden later when argument processing is done.
3762 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3763 os::win32::is_windows_2003());
3764
3765 // Initialize main_process and main_thread
3766 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3767 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3768 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3769 fatal("DuplicateHandle failed\n");
3770 }
3771 main_thread_id = (int) GetCurrentThreadId();
3772 }
3773
3774 // To install functions for atexit processing
3775 extern "C" {
3776 static void perfMemory_exit_helper() {
3777 perfMemory_exit();
3778 }
3779 }
3780
3781 static jint initSock();
3782
3783 // this is called _after_ the global arguments have been parsed
3784 jint os::init_2(void) {
3785 // Allocate a single page and mark it as readable for safepoint polling
3786 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3787 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3788
3789 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3790 guarantee( return_page != NULL, "Commit Failed for polling page");
3791
3792 os::set_polling_page( polling_page );
3793
3794 #ifndef PRODUCT
3795 if( Verbose && PrintMiscellaneous )
3796 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3797 #endif
3798
3799 if (!UseMembar) {
3800 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3801 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3802
3803 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3804 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3805
3806 os::set_memory_serialize_page( mem_serialize_page );
3807
3808 #ifndef PRODUCT
3809 if(Verbose && PrintMiscellaneous)
3810 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3811 #endif
3812 }
3813
3814 // Setup Windows Exceptions
3815
3816 // for debugging float code generation bugs
3817 if (ForceFloatExceptions) {
3818 #ifndef _WIN64
3819 static long fp_control_word = 0;
3820 __asm { fstcw fp_control_word }
3821 // see Intel PPro Manual, Vol. 2, p 7-16
3822 const long precision = 0x20;
3823 const long underflow = 0x10;
3824 const long overflow = 0x08;
3825 const long zero_div = 0x04;
3826 const long denorm = 0x02;
3827 const long invalid = 0x01;
3828 fp_control_word |= invalid;
3829 __asm { fldcw fp_control_word }
3830 #endif
3831 }
3832
3833 // If stack_commit_size is 0, windows will reserve the default size,
3834 // but only commit a small portion of it.
3835 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3836 size_t default_reserve_size = os::win32::default_stack_size();
3837 size_t actual_reserve_size = stack_commit_size;
3838 if (stack_commit_size < default_reserve_size) {
3839 // If stack_commit_size == 0, we want this too
3840 actual_reserve_size = default_reserve_size;
3841 }
3842
3843 // Check minimum allowable stack size for thread creation and to initialize
3844 // the java system classes, including StackOverflowError - depends on page
3845 // size. Add a page for compiler2 recursion in main thread.
3846 // Add in 2*BytesPerWord times page size to account for VM stack during
3847 // class initialization depending on 32 or 64 bit VM.
3848 size_t min_stack_allowed =
3849 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3850 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3851 if (actual_reserve_size < min_stack_allowed) {
3852 tty->print_cr("\nThe stack size specified is too small, "
3853 "Specify at least %dk",
3854 min_stack_allowed / K);
3855 return JNI_ERR;
3856 }
3857
3858 JavaThread::set_stack_size_at_create(stack_commit_size);
3859
3860 // Calculate theoretical max. size of Threads to guard gainst artifical
3861 // out-of-memory situations, where all available address-space has been
3862 // reserved by thread stacks.
3863 assert(actual_reserve_size != 0, "Must have a stack");
3864
3865 // Calculate the thread limit when we should start doing Virtual Memory
3866 // banging. Currently when the threads will have used all but 200Mb of space.
3867 //
3868 // TODO: consider performing a similar calculation for commit size instead
3869 // as reserve size, since on a 64-bit platform we'll run into that more
3870 // often than running out of virtual memory space. We can use the
3871 // lower value of the two calculations as the os_thread_limit.
3872 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3873 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3874
3875 // at exit methods are called in the reverse order of their registration.
3876 // there is no limit to the number of functions registered. atexit does
3877 // not set errno.
3878
3879 if (PerfAllowAtExitRegistration) {
3880 // only register atexit functions if PerfAllowAtExitRegistration is set.
3881 // atexit functions can be delayed until process exit time, which
3882 // can be problematic for embedded VM situations. Embedded VMs should
3883 // call DestroyJavaVM() to assure that VM resources are released.
3884
3885 // note: perfMemory_exit_helper atexit function may be removed in
3886 // the future if the appropriate cleanup code can be added to the
3887 // VM_Exit VMOperation's doit method.
3888 if (atexit(perfMemory_exit_helper) != 0) {
3889 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3890 }
3891 }
3892
3893 #ifndef _WIN64
3894 // Print something if NX is enabled (win32 on AMD64)
3895 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3896 #endif
3897
3898 // initialize thread priority policy
3899 prio_init();
3900
3901 if (UseNUMA && !ForceNUMA) {
3902 UseNUMA = false; // We don't fully support this yet
3903 }
3904
3905 if (UseNUMAInterleaving) {
3906 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3907 bool success = numa_interleaving_init();
3908 if (!success) UseNUMAInterleaving = false;
3909 }
3910
3911 if (initSock() != JNI_OK) {
3912 return JNI_ERR;
3913 }
3914
3915 return JNI_OK;
3916 }
3917
3918 void os::init_3(void) {
3919 return;
3920 }
3921
3922 // Mark the polling page as unreadable
3923 void os::make_polling_page_unreadable(void) {
3924 DWORD old_status;
3925 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3926 fatal("Could not disable polling page");
3927 };
3928
3929 // Mark the polling page as readable
3930 void os::make_polling_page_readable(void) {
3931 DWORD old_status;
3932 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3933 fatal("Could not enable polling page");
3934 };
3935
3936
3937 int os::stat(const char *path, struct stat *sbuf) {
3938 char pathbuf[MAX_PATH];
3939 if (strlen(path) > MAX_PATH - 1) {
3940 errno = ENAMETOOLONG;
3941 return -1;
3942 }
3943 os::native_path(strcpy(pathbuf, path));
3944 int ret = ::stat(pathbuf, sbuf);
3945 if (sbuf != NULL && UseUTCFileTimestamp) {
3946 // Fix for 6539723. st_mtime returned from stat() is dependent on
3947 // the system timezone and so can return different values for the
3948 // same file if/when daylight savings time changes. This adjustment
3949 // makes sure the same timestamp is returned regardless of the TZ.
3950 //
3951 // See:
3952 // http://msdn.microsoft.com/library/
3953 // default.asp?url=/library/en-us/sysinfo/base/
3954 // time_zone_information_str.asp
3955 // and
3956 // http://msdn.microsoft.com/library/default.asp?url=
3957 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3958 //
3959 // NOTE: there is a insidious bug here: If the timezone is changed
3960 // after the call to stat() but before 'GetTimeZoneInformation()', then
3961 // the adjustment we do here will be wrong and we'll return the wrong
3962 // value (which will likely end up creating an invalid class data
3963 // archive). Absent a better API for this, or some time zone locking
3964 // mechanism, we'll have to live with this risk.
3965 TIME_ZONE_INFORMATION tz;
3966 DWORD tzid = GetTimeZoneInformation(&tz);
3967 int daylightBias =
3968 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3969 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3970 }
3971 return ret;
3972 }
3973
3974
3975 #define FT2INT64(ft) \
3976 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3977
3978
3979 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3980 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3981 // of a thread.
3982 //
3983 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3984 // the fast estimate available on the platform.
3985
3986 // current_thread_cpu_time() is not optimized for Windows yet
3987 jlong os::current_thread_cpu_time() {
3988 // return user + sys since the cost is the same
3989 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3990 }
3991
3992 jlong os::thread_cpu_time(Thread* thread) {
3993 // consistent with what current_thread_cpu_time() returns.
3994 return os::thread_cpu_time(thread, true /* user+sys */);
3995 }
3996
3997 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3998 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3999 }
4000
4001 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4002 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4003 // If this function changes, os::is_thread_cpu_time_supported() should too
4004 if (os::win32::is_nt()) {
4005 FILETIME CreationTime;
4006 FILETIME ExitTime;
4007 FILETIME KernelTime;
4008 FILETIME UserTime;
4009
4010 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4011 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4012 return -1;
4013 else
4014 if (user_sys_cpu_time) {
4015 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4016 } else {
4017 return FT2INT64(UserTime) * 100;
4018 }
4019 } else {
4020 return (jlong) timeGetTime() * 1000000;
4021 }
4022 }
4023
4024 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4025 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4026 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4027 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4028 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4029 }
4030
4031 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4032 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4033 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4034 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4035 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4036 }
4037
4038 bool os::is_thread_cpu_time_supported() {
4039 // see os::thread_cpu_time
4040 if (os::win32::is_nt()) {
4041 FILETIME CreationTime;
4042 FILETIME ExitTime;
4043 FILETIME KernelTime;
4044 FILETIME UserTime;
4045
4046 if ( GetThreadTimes(GetCurrentThread(),
4047 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4048 return false;
4049 else
4050 return true;
4051 } else {
4052 return false;
4053 }
4054 }
4055
4056 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4057 // It does have primitives (PDH API) to get CPU usage and run queue length.
4058 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4059 // If we wanted to implement loadavg on Windows, we have a few options:
4060 //
4061 // a) Query CPU usage and run queue length and "fake" an answer by
4062 // returning the CPU usage if it's under 100%, and the run queue
4063 // length otherwise. It turns out that querying is pretty slow
4064 // on Windows, on the order of 200 microseconds on a fast machine.
4065 // Note that on the Windows the CPU usage value is the % usage
4066 // since the last time the API was called (and the first call
4067 // returns 100%), so we'd have to deal with that as well.
4068 //
4069 // b) Sample the "fake" answer using a sampling thread and store
4070 // the answer in a global variable. The call to loadavg would
4071 // just return the value of the global, avoiding the slow query.
4072 //
4073 // c) Sample a better answer using exponential decay to smooth the
4074 // value. This is basically the algorithm used by UNIX kernels.
4075 //
4076 // Note that sampling thread starvation could affect both (b) and (c).
4077 int os::loadavg(double loadavg[], int nelem) {
4078 return -1;
4079 }
4080
4081
4082 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4083 bool os::dont_yield() {
4084 return DontYieldALot;
4085 }
4086
4087 // This method is a slightly reworked copy of JDK's sysOpen
4088 // from src/windows/hpi/src/sys_api_md.c
4089
4090 int os::open(const char *path, int oflag, int mode) {
4091 char pathbuf[MAX_PATH];
4092
4093 if (strlen(path) > MAX_PATH - 1) {
4094 errno = ENAMETOOLONG;
4095 return -1;
4096 }
4097 os::native_path(strcpy(pathbuf, path));
4098 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4099 }
4100
4101 FILE* os::open(int fd, const char* mode) {
4102 return ::_fdopen(fd, mode);
4103 }
4104
4105 // Is a (classpath) directory empty?
4106 bool os::dir_is_empty(const char* path) {
4107 WIN32_FIND_DATA fd;
4108 HANDLE f = FindFirstFile(path, &fd);
4109 if (f == INVALID_HANDLE_VALUE) {
4110 return true;
4111 }
4112 FindClose(f);
4113 return false;
4114 }
4115
4116 // create binary file, rewriting existing file if required
4117 int os::create_binary_file(const char* path, bool rewrite_existing) {
4118 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4119 if (!rewrite_existing) {
4120 oflags |= _O_EXCL;
4121 }
4122 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4123 }
4124
4125 // return current position of file pointer
4126 jlong os::current_file_offset(int fd) {
4127 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4128 }
4129
4130 // move file pointer to the specified offset
4131 jlong os::seek_to_file_offset(int fd, jlong offset) {
4132 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4133 }
4134
4135
4136 jlong os::lseek(int fd, jlong offset, int whence) {
4137 return (jlong) ::_lseeki64(fd, offset, whence);
4138 }
4139
4140 // This method is a slightly reworked copy of JDK's sysNativePath
4141 // from src/windows/hpi/src/path_md.c
4142
4143 /* Convert a pathname to native format. On win32, this involves forcing all
4144 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4145 sometimes rejects '/') and removing redundant separators. The input path is
4146 assumed to have been converted into the character encoding used by the local
4147 system. Because this might be a double-byte encoding, care is taken to
4148 treat double-byte lead characters correctly.
4149
4150 This procedure modifies the given path in place, as the result is never
4151 longer than the original. There is no error return; this operation always
4152 succeeds. */
4153 char * os::native_path(char *path) {
4154 char *src = path, *dst = path, *end = path;
4155 char *colon = NULL; /* If a drive specifier is found, this will
4156 point to the colon following the drive
4157 letter */
4158
4159 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4160 assert(((!::IsDBCSLeadByte('/'))
4161 && (!::IsDBCSLeadByte('\\'))
4162 && (!::IsDBCSLeadByte(':'))),
4163 "Illegal lead byte");
4164
4165 /* Check for leading separators */
4166 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4167 while (isfilesep(*src)) {
4168 src++;
4169 }
4170
4171 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4172 /* Remove leading separators if followed by drive specifier. This
4173 hack is necessary to support file URLs containing drive
4174 specifiers (e.g., "file://c:/path"). As a side effect,
4175 "/c:/path" can be used as an alternative to "c:/path". */
4176 *dst++ = *src++;
4177 colon = dst;
4178 *dst++ = ':';
4179 src++;
4180 } else {
4181 src = path;
4182 if (isfilesep(src[0]) && isfilesep(src[1])) {
4183 /* UNC pathname: Retain first separator; leave src pointed at
4184 second separator so that further separators will be collapsed
4185 into the second separator. The result will be a pathname
4186 beginning with "\\\\" followed (most likely) by a host name. */
4187 src = dst = path + 1;
4188 path[0] = '\\'; /* Force first separator to '\\' */
4189 }
4190 }
4191
4192 end = dst;
4193
4194 /* Remove redundant separators from remainder of path, forcing all
4195 separators to be '\\' rather than '/'. Also, single byte space
4196 characters are removed from the end of the path because those
4197 are not legal ending characters on this operating system.
4198 */
4199 while (*src != '\0') {
4200 if (isfilesep(*src)) {
4201 *dst++ = '\\'; src++;
4202 while (isfilesep(*src)) src++;
4203 if (*src == '\0') {
4204 /* Check for trailing separator */
4205 end = dst;
4206 if (colon == dst - 2) break; /* "z:\\" */
4207 if (dst == path + 1) break; /* "\\" */
4208 if (dst == path + 2 && isfilesep(path[0])) {
4209 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4210 beginning of a UNC pathname. Even though it is not, by
4211 itself, a valid UNC pathname, we leave it as is in order
4212 to be consistent with the path canonicalizer as well
4213 as the win32 APIs, which treat this case as an invalid
4214 UNC pathname rather than as an alias for the root
4215 directory of the current drive. */
4216 break;
4217 }
4218 end = --dst; /* Path does not denote a root directory, so
4219 remove trailing separator */
4220 break;
4221 }
4222 end = dst;
4223 } else {
4224 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4225 *dst++ = *src++;
4226 if (*src) *dst++ = *src++;
4227 end = dst;
4228 } else { /* Copy a single-byte character */
4229 char c = *src++;
4230 *dst++ = c;
4231 /* Space is not a legal ending character */
4232 if (c != ' ') end = dst;
4233 }
4234 }
4235 }
4236
4237 *end = '\0';
4238
4239 /* For "z:", add "." to work around a bug in the C runtime library */
4240 if (colon == dst - 1) {
4241 path[2] = '.';
4242 path[3] = '\0';
4243 }
4244
4245 return path;
4246 }
4247
4248 // This code is a copy of JDK's sysSetLength
4249 // from src/windows/hpi/src/sys_api_md.c
4250
4251 int os::ftruncate(int fd, jlong length) {
4252 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4253 long high = (long)(length >> 32);
4254 DWORD ret;
4255
4256 if (h == (HANDLE)(-1)) {
4257 return -1;
4258 }
4259
4260 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4261 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4262 return -1;
4263 }
4264
4265 if (::SetEndOfFile(h) == FALSE) {
4266 return -1;
4267 }
4268
4269 return 0;
4270 }
4271
4272
4273 // This code is a copy of JDK's sysSync
4274 // from src/windows/hpi/src/sys_api_md.c
4275 // except for the legacy workaround for a bug in Win 98
4276
4277 int os::fsync(int fd) {
4278 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4279
4280 if ( (!::FlushFileBuffers(handle)) &&
4281 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4282 /* from winerror.h */
4283 return -1;
4284 }
4285 return 0;
4286 }
4287
4288 static int nonSeekAvailable(int, long *);
4289 static int stdinAvailable(int, long *);
4290
4291 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4292 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4293
4294 // This code is a copy of JDK's sysAvailable
4295 // from src/windows/hpi/src/sys_api_md.c
4296
4297 int os::available(int fd, jlong *bytes) {
4298 jlong cur, end;
4299 struct _stati64 stbuf64;
4300
4301 if (::_fstati64(fd, &stbuf64) >= 0) {
4302 int mode = stbuf64.st_mode;
4303 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4304 int ret;
4305 long lpbytes;
4306 if (fd == 0) {
4307 ret = stdinAvailable(fd, &lpbytes);
4308 } else {
4309 ret = nonSeekAvailable(fd, &lpbytes);
4310 }
4311 (*bytes) = (jlong)(lpbytes);
4312 return ret;
4313 }
4314 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4315 return FALSE;
4316 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4317 return FALSE;
4318 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4319 return FALSE;
4320 }
4321 *bytes = end - cur;
4322 return TRUE;
4323 } else {
4324 return FALSE;
4325 }
4326 }
4327
4328 // This code is a copy of JDK's nonSeekAvailable
4329 // from src/windows/hpi/src/sys_api_md.c
4330
4331 static int nonSeekAvailable(int fd, long *pbytes) {
4332 /* This is used for available on non-seekable devices
4333 * (like both named and anonymous pipes, such as pipes
4334 * connected to an exec'd process).
4335 * Standard Input is a special case.
4336 *
4337 */
4338 HANDLE han;
4339
4340 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4341 return FALSE;
4342 }
4343
4344 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4345 /* PeekNamedPipe fails when at EOF. In that case we
4346 * simply make *pbytes = 0 which is consistent with the
4347 * behavior we get on Solaris when an fd is at EOF.
4348 * The only alternative is to raise an Exception,
4349 * which isn't really warranted.
4350 */
4351 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4352 return FALSE;
4353 }
4354 *pbytes = 0;
4355 }
4356 return TRUE;
4357 }
4358
4359 #define MAX_INPUT_EVENTS 2000
4360
4361 // This code is a copy of JDK's stdinAvailable
4362 // from src/windows/hpi/src/sys_api_md.c
4363
4364 static int stdinAvailable(int fd, long *pbytes) {
4365 HANDLE han;
4366 DWORD numEventsRead = 0; /* Number of events read from buffer */
4367 DWORD numEvents = 0; /* Number of events in buffer */
4368 DWORD i = 0; /* Loop index */
4369 DWORD curLength = 0; /* Position marker */
4370 DWORD actualLength = 0; /* Number of bytes readable */
4371 BOOL error = FALSE; /* Error holder */
4372 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4373
4374 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4375 return FALSE;
4376 }
4377
4378 /* Construct an array of input records in the console buffer */
4379 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4380 if (error == 0) {
4381 return nonSeekAvailable(fd, pbytes);
4382 }
4383
4384 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4385 if (numEvents > MAX_INPUT_EVENTS) {
4386 numEvents = MAX_INPUT_EVENTS;
4387 }
4388
4389 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4390 if (lpBuffer == NULL) {
4391 return FALSE;
4392 }
4393
4394 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4395 if (error == 0) {
4396 os::free(lpBuffer, mtInternal);
4397 return FALSE;
4398 }
4399
4400 /* Examine input records for the number of bytes available */
4401 for(i=0; i<numEvents; i++) {
4402 if (lpBuffer[i].EventType == KEY_EVENT) {
4403
4404 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4405 &(lpBuffer[i].Event);
4406 if (keyRecord->bKeyDown == TRUE) {
4407 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4408 curLength++;
4409 if (*keyPressed == '\r') {
4410 actualLength = curLength;
4411 }
4412 }
4413 }
4414 }
4415
4416 if(lpBuffer != NULL) {
4417 os::free(lpBuffer, mtInternal);
4418 }
4419
4420 *pbytes = (long) actualLength;
4421 return TRUE;
4422 }
4423
4424 // Map a block of memory.
4425 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4426 char *addr, size_t bytes, bool read_only,
4427 bool allow_exec) {
4428 HANDLE hFile;
4429 char* base;
4430
4431 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4432 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4433 if (hFile == NULL) {
4434 if (PrintMiscellaneous && Verbose) {
4435 DWORD err = GetLastError();
4436 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4437 }
4438 return NULL;
4439 }
4440
4441 if (allow_exec) {
4442 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4443 // unless it comes from a PE image (which the shared archive is not.)
4444 // Even VirtualProtect refuses to give execute access to mapped memory
4445 // that was not previously executable.
4446 //
4447 // Instead, stick the executable region in anonymous memory. Yuck.
4448 // Penalty is that ~4 pages will not be shareable - in the future
4449 // we might consider DLLizing the shared archive with a proper PE
4450 // header so that mapping executable + sharing is possible.
4451
4452 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4453 PAGE_READWRITE);
4454 if (base == NULL) {
4455 if (PrintMiscellaneous && Verbose) {
4456 DWORD err = GetLastError();
4457 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4458 }
4459 CloseHandle(hFile);
4460 return NULL;
4461 }
4462
4463 DWORD bytes_read;
4464 OVERLAPPED overlapped;
4465 overlapped.Offset = (DWORD)file_offset;
4466 overlapped.OffsetHigh = 0;
4467 overlapped.hEvent = NULL;
4468 // ReadFile guarantees that if the return value is true, the requested
4469 // number of bytes were read before returning.
4470 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4471 if (!res) {
4472 if (PrintMiscellaneous && Verbose) {
4473 DWORD err = GetLastError();
4474 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4475 }
4476 release_memory(base, bytes);
4477 CloseHandle(hFile);
4478 return NULL;
4479 }
4480 } else {
4481 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4482 NULL /*file_name*/);
4483 if (hMap == NULL) {
4484 if (PrintMiscellaneous && Verbose) {
4485 DWORD err = GetLastError();
4486 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4487 }
4488 CloseHandle(hFile);
4489 return NULL;
4490 }
4491
4492 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4493 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4494 (DWORD)bytes, addr);
4495 if (base == NULL) {
4496 if (PrintMiscellaneous && Verbose) {
4497 DWORD err = GetLastError();
4498 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4499 }
4500 CloseHandle(hMap);
4501 CloseHandle(hFile);
4502 return NULL;
4503 }
4504
4505 if (CloseHandle(hMap) == 0) {
4506 if (PrintMiscellaneous && Verbose) {
4507 DWORD err = GetLastError();
4508 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4509 }
4510 CloseHandle(hFile);
4511 return base;
4512 }
4513 }
4514
4515 if (allow_exec) {
4516 DWORD old_protect;
4517 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4518 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4519
4520 if (!res) {
4521 if (PrintMiscellaneous && Verbose) {
4522 DWORD err = GetLastError();
4523 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4524 }
4525 // Don't consider this a hard error, on IA32 even if the
4526 // VirtualProtect fails, we should still be able to execute
4527 CloseHandle(hFile);
4528 return base;
4529 }
4530 }
4531
4532 if (CloseHandle(hFile) == 0) {
4533 if (PrintMiscellaneous && Verbose) {
4534 DWORD err = GetLastError();
4535 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4536 }
4537 return base;
4538 }
4539
4540 return base;
4541 }
4542
4543
4544 // Remap a block of memory.
4545 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4546 char *addr, size_t bytes, bool read_only,
4547 bool allow_exec) {
4548 // This OS does not allow existing memory maps to be remapped so we
4549 // have to unmap the memory before we remap it.
4550 if (!os::unmap_memory(addr, bytes)) {
4551 return NULL;
4552 }
4553
4554 // There is a very small theoretical window between the unmap_memory()
4555 // call above and the map_memory() call below where a thread in native
4556 // code may be able to access an address that is no longer mapped.
4557
4558 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4559 read_only, allow_exec);
4560 }
4561
4562
4563 // Unmap a block of memory.
4564 // Returns true=success, otherwise false.
4565
4566 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4567 BOOL result = UnmapViewOfFile(addr);
4568 if (result == 0) {
4569 if (PrintMiscellaneous && Verbose) {
4570 DWORD err = GetLastError();
4571 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4572 }
4573 return false;
4574 }
4575 return true;
4576 }
4577
4578 void os::pause() {
4579 char filename[MAX_PATH];
4580 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4581 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4582 } else {
4583 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4584 }
4585
4586 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4587 if (fd != -1) {
4588 struct stat buf;
4589 ::close(fd);
4590 while (::stat(filename, &buf) == 0) {
4591 Sleep(100);
4592 }
4593 } else {
4594 jio_fprintf(stderr,
4595 "Could not open pause file '%s', continuing immediately.\n", filename);
4596 }
4597 }
4598
4599 // An Event wraps a win32 "CreateEvent" kernel handle.
4600 //
4601 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4602 //
4603 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4604 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4605 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4606 // In addition, an unpark() operation might fetch the handle field, but the
4607 // event could recycle between the fetch and the SetEvent() operation.
4608 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4609 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4610 // on an stale but recycled handle would be harmless, but in practice this might
4611 // confuse other non-Sun code, so it's not a viable approach.
4612 //
4613 // 2: Once a win32 event handle is associated with an Event, it remains associated
4614 // with the Event. The event handle is never closed. This could be construed
4615 // as handle leakage, but only up to the maximum # of threads that have been extant
4616 // at any one time. This shouldn't be an issue, as windows platforms typically
4617 // permit a process to have hundreds of thousands of open handles.
4618 //
4619 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4620 // and release unused handles.
4621 //
4622 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4623 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4624 //
4625 // 5. Use an RCU-like mechanism (Read-Copy Update).
4626 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4627 //
4628 // We use (2).
4629 //
4630 // TODO-FIXME:
4631 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4632 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4633 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4634 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4635 // into a single win32 CreateEvent() handle.
4636 //
4637 // _Event transitions in park()
4638 // -1 => -1 : illegal
4639 // 1 => 0 : pass - return immediately
4640 // 0 => -1 : block
4641 //
4642 // _Event serves as a restricted-range semaphore :
4643 // -1 : thread is blocked
4644 // 0 : neutral - thread is running or ready
4645 // 1 : signaled - thread is running or ready
4646 //
4647 // Another possible encoding of _Event would be
4648 // with explicit "PARKED" and "SIGNALED" bits.
4649
4650 int os::PlatformEvent::park (jlong Millis) {
4651 guarantee (_ParkHandle != NULL , "Invariant") ;
4652 guarantee (Millis > 0 , "Invariant") ;
4653 int v ;
4654
4655 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4656 // the initial park() operation.
4657
4658 for (;;) {
4659 v = _Event ;
4660 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4661 }
4662 guarantee ((v == 0) || (v == 1), "invariant") ;
4663 if (v != 0) return OS_OK ;
4664
4665 // Do this the hard way by blocking ...
4666 // TODO: consider a brief spin here, gated on the success of recent
4667 // spin attempts by this thread.
4668 //
4669 // We decompose long timeouts into series of shorter timed waits.
4670 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4671 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4672 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4673 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4674 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4675 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4676 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4677 // for the already waited time. This policy does not admit any new outcomes.
4678 // In the future, however, we might want to track the accumulated wait time and
4679 // adjust Millis accordingly if we encounter a spurious wakeup.
4680
4681 const int MAXTIMEOUT = 0x10000000 ;
4682 DWORD rv = WAIT_TIMEOUT ;
4683 while (_Event < 0 && Millis > 0) {
4684 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4685 if (Millis > MAXTIMEOUT) {
4686 prd = MAXTIMEOUT ;
4687 }
4688 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4689 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4690 if (rv == WAIT_TIMEOUT) {
4691 Millis -= prd ;
4692 }
4693 }
4694 v = _Event ;
4695 _Event = 0 ;
4696 // see comment at end of os::PlatformEvent::park() below:
4697 OrderAccess::fence() ;
4698 // If we encounter a nearly simultanous timeout expiry and unpark()
4699 // we return OS_OK indicating we awoke via unpark().
4700 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4701 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4702 }
4703
4704 void os::PlatformEvent::park () {
4705 guarantee (_ParkHandle != NULL, "Invariant") ;
4706 // Invariant: Only the thread associated with the Event/PlatformEvent
4707 // may call park().
4708 int v ;
4709 for (;;) {
4710 v = _Event ;
4711 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4712 }
4713 guarantee ((v == 0) || (v == 1), "invariant") ;
4714 if (v != 0) return ;
4715
4716 // Do this the hard way by blocking ...
4717 // TODO: consider a brief spin here, gated on the success of recent
4718 // spin attempts by this thread.
4719 while (_Event < 0) {
4720 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4721 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4722 }
4723
4724 // Usually we'll find _Event == 0 at this point, but as
4725 // an optional optimization we clear it, just in case can
4726 // multiple unpark() operations drove _Event up to 1.
4727 _Event = 0 ;
4728 OrderAccess::fence() ;
4729 guarantee (_Event >= 0, "invariant") ;
4730 }
4731
4732 void os::PlatformEvent::unpark() {
4733 guarantee (_ParkHandle != NULL, "Invariant") ;
4734
4735 // Transitions for _Event:
4736 // 0 :=> 1
4737 // 1 :=> 1
4738 // -1 :=> either 0 or 1; must signal target thread
4739 // That is, we can safely transition _Event from -1 to either
4740 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4741 // unpark() calls.
4742 // See also: "Semaphores in Plan 9" by Mullender & Cox
4743 //
4744 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4745 // that it will take two back-to-back park() calls for the owning
4746 // thread to block. This has the benefit of forcing a spurious return
4747 // from the first park() call after an unpark() call which will help
4748 // shake out uses of park() and unpark() without condition variables.
4749
4750 if (Atomic::xchg(1, &_Event) >= 0) return;
4751
4752 ::SetEvent(_ParkHandle);
4753 }
4754
4755
4756 // JSR166
4757 // -------------------------------------------------------
4758
4759 /*
4760 * The Windows implementation of Park is very straightforward: Basic
4761 * operations on Win32 Events turn out to have the right semantics to
4762 * use them directly. We opportunistically resuse the event inherited
4763 * from Monitor.
4764 */
4765
4766
4767 void Parker::park(bool isAbsolute, jlong time) {
4768 guarantee (_ParkEvent != NULL, "invariant") ;
4769 // First, demultiplex/decode time arguments
4770 if (time < 0) { // don't wait
4771 return;
4772 }
4773 else if (time == 0 && !isAbsolute) {
4774 time = INFINITE;
4775 }
4776 else if (isAbsolute) {
4777 time -= os::javaTimeMillis(); // convert to relative time
4778 if (time <= 0) // already elapsed
4779 return;
4780 }
4781 else { // relative
4782 time /= 1000000; // Must coarsen from nanos to millis
4783 if (time == 0) // Wait for the minimal time unit if zero
4784 time = 1;
4785 }
4786
4787 JavaThread* thread = (JavaThread*)(Thread::current());
4788 assert(thread->is_Java_thread(), "Must be JavaThread");
4789 JavaThread *jt = (JavaThread *)thread;
4790
4791 // Don't wait if interrupted or already triggered
4792 if (Thread::is_interrupted(thread, false) ||
4793 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4794 ResetEvent(_ParkEvent);
4795 return;
4796 }
4797 else {
4798 ThreadBlockInVM tbivm(jt);
4799 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4800 jt->set_suspend_equivalent();
4801
4802 WaitForSingleObject(_ParkEvent, time);
4803 ResetEvent(_ParkEvent);
4804
4805 // If externally suspended while waiting, re-suspend
4806 if (jt->handle_special_suspend_equivalent_condition()) {
4807 jt->java_suspend_self();
4808 }
4809 }
4810 }
4811
4812 void Parker::unpark() {
4813 guarantee (_ParkEvent != NULL, "invariant") ;
4814 SetEvent(_ParkEvent);
4815 }
4816
4817 // Run the specified command in a separate process. Return its exit value,
4818 // or -1 on failure (e.g. can't create a new process).
4819 int os::fork_and_exec(char* cmd) {
4820 STARTUPINFO si;
4821 PROCESS_INFORMATION pi;
4822
4823 memset(&si, 0, sizeof(si));
4824 si.cb = sizeof(si);
4825 memset(&pi, 0, sizeof(pi));
4826 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4827 cmd, // command line
4828 NULL, // process security attribute
4829 NULL, // thread security attribute
4830 TRUE, // inherits system handles
4831 0, // no creation flags
4832 NULL, // use parent's environment block
4833 NULL, // use parent's starting directory
4834 &si, // (in) startup information
4835 &pi); // (out) process information
4836
4837 if (rslt) {
4838 // Wait until child process exits.
4839 WaitForSingleObject(pi.hProcess, INFINITE);
4840
4841 DWORD exit_code;
4842 GetExitCodeProcess(pi.hProcess, &exit_code);
4843
4844 // Close process and thread handles.
4845 CloseHandle(pi.hProcess);
4846 CloseHandle(pi.hThread);
4847
4848 return (int)exit_code;
4849 } else {
4850 return -1;
4851 }
4852 }
4853
4854 //--------------------------------------------------------------------------------------------------
4855 // Non-product code
4856
4857 static int mallocDebugIntervalCounter = 0;
4858 static int mallocDebugCounter = 0;
4859 bool os::check_heap(bool force) {
4860 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4861 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4862 // Note: HeapValidate executes two hardware breakpoints when it finds something
4863 // wrong; at these points, eax contains the address of the offending block (I think).
4864 // To get to the exlicit error message(s) below, just continue twice.
4865 HANDLE heap = GetProcessHeap();
4866 { HeapLock(heap);
4867 PROCESS_HEAP_ENTRY phe;
4868 phe.lpData = NULL;
4869 while (HeapWalk(heap, &phe) != 0) {
4870 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4871 !HeapValidate(heap, 0, phe.lpData)) {
4872 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4873 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4874 fatal("corrupted C heap");
4875 }
4876 }
4877 DWORD err = GetLastError();
4878 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4879 fatal(err_msg("heap walk aborted with error %d", err));
4880 }
4881 HeapUnlock(heap);
4882 }
4883 mallocDebugIntervalCounter = 0;
4884 }
4885 return true;
4886 }
4887
4888
4889 bool os::find(address addr, outputStream* st) {
4890 // Nothing yet
4891 return false;
4892 }
4893
4894 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4895 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4896
4897 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4898 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4899 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4900 address addr = (address) exceptionRecord->ExceptionInformation[1];
4901
4902 if (os::is_memory_serialize_page(thread, addr))
4903 return EXCEPTION_CONTINUE_EXECUTION;
4904 }
4905
4906 return EXCEPTION_CONTINUE_SEARCH;
4907 }
4908
4909 // We don't build a headless jre for Windows
4910 bool os::is_headless_jre() { return false; }
4911
4912 static jint initSock() {
4913 WSADATA wsadata;
4914
4915 if (!os::WinSock2Dll::WinSock2Available()) {
4916 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
4917 ::GetLastError());
4918 return JNI_ERR;
4919 }
4920
4921 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
4922 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
4923 ::GetLastError());
4924 return JNI_ERR;
4925 }
4926 return JNI_OK;
4927 }
4928
4929 struct hostent* os::get_host_by_name(char* name) {
4930 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4931 }
4932
4933 int os::socket_close(int fd) {
4934 return ::closesocket(fd);
4935 }
4936
4937 int os::socket_available(int fd, jint *pbytes) {
4938 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4939 return (ret < 0) ? 0 : 1;
4940 }
4941
4942 int os::socket(int domain, int type, int protocol) {
4943 return ::socket(domain, type, protocol);
4944 }
4945
4946 int os::listen(int fd, int count) {
4947 return ::listen(fd, count);
4948 }
4949
4950 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4951 return ::connect(fd, him, len);
4952 }
4953
4954 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4955 return ::accept(fd, him, len);
4956 }
4957
4958 int os::sendto(int fd, char* buf, size_t len, uint flags,
4959 struct sockaddr* to, socklen_t tolen) {
4960
4961 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4962 }
4963
4964 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4965 sockaddr* from, socklen_t* fromlen) {
4966
4967 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4968 }
4969
4970 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4971 return ::recv(fd, buf, (int)nBytes, flags);
4972 }
4973
4974 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4975 return ::send(fd, buf, (int)nBytes, flags);
4976 }
4977
4978 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
4979 return ::send(fd, buf, (int)nBytes, flags);
4980 }
4981
4982 int os::timeout(int fd, long timeout) {
4983 fd_set tbl;
4984 struct timeval t;
4985
4986 t.tv_sec = timeout / 1000;
4987 t.tv_usec = (timeout % 1000) * 1000;
4988
4989 tbl.fd_count = 1;
4990 tbl.fd_array[0] = fd;
4991
4992 return ::select(1, &tbl, 0, 0, &t);
4993 }
4994
4995 int os::get_host_name(char* name, int namelen) {
4996 return ::gethostname(name, namelen);
4997 }
4998
4999 int os::socket_shutdown(int fd, int howto) {
5000 return ::shutdown(fd, howto);
5001 }
5002
5003 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5004 return ::bind(fd, him, len);
5005 }
5006
5007 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5008 return ::getsockname(fd, him, len);
5009 }
5010
5011 int os::get_sock_opt(int fd, int level, int optname,
5012 char* optval, socklen_t* optlen) {
5013 return ::getsockopt(fd, level, optname, optval, optlen);
5014 }
5015
5016 int os::set_sock_opt(int fd, int level, int optname,
5017 const char* optval, socklen_t optlen) {
5018 return ::setsockopt(fd, level, optname, optval, optlen);
5019 }
5020
5021
5022 // Kernel32 API
5023 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5024 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5025 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5026 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5027 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5028
5029 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5030 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5031 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5032 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5033 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5034
5035
5036 BOOL os::Kernel32Dll::initialized = FALSE;
5037 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5038 assert(initialized && _GetLargePageMinimum != NULL,
5039 "GetLargePageMinimumAvailable() not yet called");
5040 return _GetLargePageMinimum();
5041 }
5042
5043 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5044 if (!initialized) {
5045 initialize();
5046 }
5047 return _GetLargePageMinimum != NULL;
5048 }
5049
5050 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5051 if (!initialized) {
5052 initialize();
5053 }
5054 return _VirtualAllocExNuma != NULL;
5055 }
5056
5057 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5058 assert(initialized && _VirtualAllocExNuma != NULL,
5059 "NUMACallsAvailable() not yet called");
5060
5061 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5062 }
5063
5064 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5065 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5066 "NUMACallsAvailable() not yet called");
5067
5068 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5069 }
5070
5071 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5072 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5073 "NUMACallsAvailable() not yet called");
5074
5075 return _GetNumaNodeProcessorMask(node, proc_mask);
5076 }
5077
5078 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5079 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5080 if (!initialized) {
5081 initialize();
5082 }
5083
5084 if (_RtlCaptureStackBackTrace != NULL) {
5085 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5086 BackTrace, BackTraceHash);
5087 } else {
5088 return 0;
5089 }
5090 }
5091
5092 void os::Kernel32Dll::initializeCommon() {
5093 if (!initialized) {
5094 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5095 assert(handle != NULL, "Just check");
5096 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5097 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5098 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5099 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5100 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5101 initialized = TRUE;
5102 }
5103 }
5104
5105
5106
5107 #ifndef JDK6_OR_EARLIER
5108
5109 void os::Kernel32Dll::initialize() {
5110 initializeCommon();
5111 }
5112
5113
5114 // Kernel32 API
5115 inline BOOL os::Kernel32Dll::SwitchToThread() {
5116 return ::SwitchToThread();
5117 }
5118
5119 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5120 return true;
5121 }
5122
5123 // Help tools
5124 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5125 return true;
5126 }
5127
5128 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5129 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5130 }
5131
5132 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5133 return ::Module32First(hSnapshot, lpme);
5134 }
5135
5136 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5137 return ::Module32Next(hSnapshot, lpme);
5138 }
5139
5140
5141 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5142 return true;
5143 }
5144
5145 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5146 ::GetNativeSystemInfo(lpSystemInfo);
5147 }
5148
5149 // PSAPI API
5150 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5151 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5152 }
5153
5154 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5155 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5156 }
5157
5158 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5159 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5160 }
5161
5162 inline BOOL os::PSApiDll::PSApiAvailable() {
5163 return true;
5164 }
5165
5166
5167 // WinSock2 API
5168 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5169 return ::WSAStartup(wVersionRequested, lpWSAData);
5170 }
5171
5172 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5173 return ::gethostbyname(name);
5174 }
5175
5176 inline BOOL os::WinSock2Dll::WinSock2Available() {
5177 return true;
5178 }
5179
5180 // Advapi API
5181 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5182 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5183 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5184 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5185 BufferLength, PreviousState, ReturnLength);
5186 }
5187
5188 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5189 PHANDLE TokenHandle) {
5190 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5191 }
5192
5193 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5194 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5195 }
5196
5197 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5198 return true;
5199 }
5200
5201 #else
5202 // Kernel32 API
5203 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5204 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5205 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5206 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5207 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5208
5209 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5210 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5211 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5212 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5213 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5214
5215 void os::Kernel32Dll::initialize() {
5216 if (!initialized) {
5217 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5218 assert(handle != NULL, "Just check");
5219
5220 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5221 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5222 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5223 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5224 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5225 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5226 initializeCommon(); // resolve the functions that always need resolving
5227
5228 initialized = TRUE;
5229 }
5230 }
5231
5232 BOOL os::Kernel32Dll::SwitchToThread() {
5233 assert(initialized && _SwitchToThread != NULL,
5234 "SwitchToThreadAvailable() not yet called");
5235 return _SwitchToThread();
5236 }
5237
5238
5239 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5240 if (!initialized) {
5241 initialize();
5242 }
5243 return _SwitchToThread != NULL;
5244 }
5245
5246 // Help tools
5247 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5248 if (!initialized) {
5249 initialize();
5250 }
5251 return _CreateToolhelp32Snapshot != NULL &&
5252 _Module32First != NULL &&
5253 _Module32Next != NULL;
5254 }
5255
5256 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5257 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5258 "HelpToolsAvailable() not yet called");
5259
5260 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5261 }
5262
5263 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5264 assert(initialized && _Module32First != NULL,
5265 "HelpToolsAvailable() not yet called");
5266
5267 return _Module32First(hSnapshot, lpme);
5268 }
5269
5270 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5271 assert(initialized && _Module32Next != NULL,
5272 "HelpToolsAvailable() not yet called");
5273
5274 return _Module32Next(hSnapshot, lpme);
5275 }
5276
5277
5278 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5279 if (!initialized) {
5280 initialize();
5281 }
5282 return _GetNativeSystemInfo != NULL;
5283 }
5284
5285 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5286 assert(initialized && _GetNativeSystemInfo != NULL,
5287 "GetNativeSystemInfoAvailable() not yet called");
5288
5289 _GetNativeSystemInfo(lpSystemInfo);
5290 }
5291
5292 // PSAPI API
5293
5294
5295 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5296 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5297 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5298
5299 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5300 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5301 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5302 BOOL os::PSApiDll::initialized = FALSE;
5303
5304 void os::PSApiDll::initialize() {
5305 if (!initialized) {
5306 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5307 if (handle != NULL) {
5308 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5309 "EnumProcessModules");
5310 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5311 "GetModuleFileNameExA");
5312 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5313 "GetModuleInformation");
5314 }
5315 initialized = TRUE;
5316 }
5317 }
5318
5319
5320
5321 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5322 assert(initialized && _EnumProcessModules != NULL,
5323 "PSApiAvailable() not yet called");
5324 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5325 }
5326
5327 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5328 assert(initialized && _GetModuleFileNameEx != NULL,
5329 "PSApiAvailable() not yet called");
5330 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5331 }
5332
5333 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5334 assert(initialized && _GetModuleInformation != NULL,
5335 "PSApiAvailable() not yet called");
5336 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5337 }
5338
5339 BOOL os::PSApiDll::PSApiAvailable() {
5340 if (!initialized) {
5341 initialize();
5342 }
5343 return _EnumProcessModules != NULL &&
5344 _GetModuleFileNameEx != NULL &&
5345 _GetModuleInformation != NULL;
5346 }
5347
5348
5349 // WinSock2 API
5350 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5351 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5352
5353 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5354 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5355 BOOL os::WinSock2Dll::initialized = FALSE;
5356
5357 void os::WinSock2Dll::initialize() {
5358 if (!initialized) {
5359 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5360 if (handle != NULL) {
5361 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5362 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5363 }
5364 initialized = TRUE;
5365 }
5366 }
5367
5368
5369 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5370 assert(initialized && _WSAStartup != NULL,
5371 "WinSock2Available() not yet called");
5372 return _WSAStartup(wVersionRequested, lpWSAData);
5373 }
5374
5375 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5376 assert(initialized && _gethostbyname != NULL,
5377 "WinSock2Available() not yet called");
5378 return _gethostbyname(name);
5379 }
5380
5381 BOOL os::WinSock2Dll::WinSock2Available() {
5382 if (!initialized) {
5383 initialize();
5384 }
5385 return _WSAStartup != NULL &&
5386 _gethostbyname != NULL;
5387 }
5388
5389 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5390 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5391 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5392
5393 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5394 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5395 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5396 BOOL os::Advapi32Dll::initialized = FALSE;
5397
5398 void os::Advapi32Dll::initialize() {
5399 if (!initialized) {
5400 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5401 if (handle != NULL) {
5402 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5403 "AdjustTokenPrivileges");
5404 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5405 "OpenProcessToken");
5406 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5407 "LookupPrivilegeValueA");
5408 }
5409 initialized = TRUE;
5410 }
5411 }
5412
5413 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5414 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5415 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5416 assert(initialized && _AdjustTokenPrivileges != NULL,
5417 "AdvapiAvailable() not yet called");
5418 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5419 BufferLength, PreviousState, ReturnLength);
5420 }
5421
5422 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5423 PHANDLE TokenHandle) {
5424 assert(initialized && _OpenProcessToken != NULL,
5425 "AdvapiAvailable() not yet called");
5426 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5427 }
5428
5429 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5430 assert(initialized && _LookupPrivilegeValue != NULL,
5431 "AdvapiAvailable() not yet called");
5432 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5433 }
5434
5435 BOOL os::Advapi32Dll::AdvapiAvailable() {
5436 if (!initialized) {
5437 initialize();
5438 }
5439 return _AdjustTokenPrivileges != NULL &&
5440 _OpenProcessToken != NULL &&
5441 _LookupPrivilegeValue != NULL;
5442 }
5443
5444 #endif