1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/decoder.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
70
71 #ifdef _DEBUG
72 #include <crtdbg.h>
73 #endif
74
75
76 #include <windows.h>
77 #include <sys/types.h>
78 #include <sys/stat.h>
79 #include <sys/timeb.h>
80 #include <objidl.h>
81 #include <shlobj.h>
82
83 #include <malloc.h>
84 #include <signal.h>
85 #include <direct.h>
86 #include <errno.h>
87 #include <fcntl.h>
88 #include <io.h>
89 #include <process.h> // For _beginthreadex(), _endthreadex()
90 #include <imagehlp.h> // For os::dll_address_to_function_name
91 /* for enumerating dll libraries */
92 #include <vdmdbg.h>
93
94 // for timer info max values which include all bits
95 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
96
97 // For DLL loading/load error detection
98 // Values of PE COFF
99 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
100 #define IMAGE_FILE_SIGNATURE_LENGTH 4
101
102 static HANDLE main_process;
103 static HANDLE main_thread;
104 static int main_thread_id;
105
106 static FILETIME process_creation_time;
107 static FILETIME process_exit_time;
108 static FILETIME process_user_time;
109 static FILETIME process_kernel_time;
110
111 #ifdef _M_IA64
112 #define __CPU__ ia64
113 #elif _M_AMD64
114 #define __CPU__ amd64
115 #else
116 #define __CPU__ i486
117 #endif
118
119 // save DLL module handle, used by GetModuleFileName
120
121 HINSTANCE vm_lib_handle;
122
123 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
124 switch (reason) {
125 case DLL_PROCESS_ATTACH:
126 vm_lib_handle = hinst;
127 if(ForceTimeHighResolution)
128 timeBeginPeriod(1L);
129 break;
130 case DLL_PROCESS_DETACH:
131 if(ForceTimeHighResolution)
132 timeEndPeriod(1L);
133 break;
134 default:
135 break;
136 }
137 return true;
138 }
139
140 static inline double fileTimeAsDouble(FILETIME* time) {
141 const double high = (double) ((unsigned int) ~0);
142 const double split = 10000000.0;
143 double result = (time->dwLowDateTime / split) +
144 time->dwHighDateTime * (high/split);
145 return result;
146 }
147
148 // Implementation of os
149
150 bool os::getenv(const char* name, char* buffer, int len) {
151 int result = GetEnvironmentVariable(name, buffer, len);
152 return result > 0 && result < len;
153 }
154
155
156 // No setuid programs under Windows.
157 bool os::have_special_privileges() {
158 return false;
159 }
160
161
162 // This method is a periodic task to check for misbehaving JNI applications
163 // under CheckJNI, we can add any periodic checks here.
164 // For Windows at the moment does nothing
165 void os::run_periodic_checks() {
166 return;
167 }
168
169 #ifndef _WIN64
170 // previous UnhandledExceptionFilter, if there is one
171 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
172
173 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
174 #endif
175 void os::init_system_properties_values() {
176 /* sysclasspath, java_home, dll_dir */
177 {
178 char *home_path;
179 char *dll_path;
180 char *pslash;
181 char *bin = "\\bin";
182 char home_dir[MAX_PATH];
183
184 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
185 os::jvm_path(home_dir, sizeof(home_dir));
186 // Found the full path to jvm.dll.
187 // Now cut the path to <java_home>/jre if we can.
188 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
189 pslash = strrchr(home_dir, '\\');
190 if (pslash != NULL) {
191 *pslash = '\0'; /* get rid of \{client|server} */
192 pslash = strrchr(home_dir, '\\');
193 if (pslash != NULL)
194 *pslash = '\0'; /* get rid of \bin */
195 }
196 }
197
198 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
199 if (home_path == NULL)
200 return;
201 strcpy(home_path, home_dir);
202 Arguments::set_java_home(home_path);
203
204 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
205 if (dll_path == NULL)
206 return;
207 strcpy(dll_path, home_dir);
208 strcat(dll_path, bin);
209 Arguments::set_dll_dir(dll_path);
210
211 if (!set_boot_path('\\', ';'))
212 return;
213 }
214
215 /* library_path */
216 #define EXT_DIR "\\lib\\ext"
217 #define BIN_DIR "\\bin"
218 #define PACKAGE_DIR "\\Sun\\Java"
219 {
220 /* Win32 library search order (See the documentation for LoadLibrary):
221 *
222 * 1. The directory from which application is loaded.
223 * 2. The system wide Java Extensions directory (Java only)
224 * 3. System directory (GetSystemDirectory)
225 * 4. Windows directory (GetWindowsDirectory)
226 * 5. The PATH environment variable
227 * 6. The current directory
228 */
229
230 char *library_path;
231 char tmp[MAX_PATH];
232 char *path_str = ::getenv("PATH");
233
234 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
235 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
236
237 library_path[0] = '\0';
238
239 GetModuleFileName(NULL, tmp, sizeof(tmp));
240 *(strrchr(tmp, '\\')) = '\0';
241 strcat(library_path, tmp);
242
243 GetWindowsDirectory(tmp, sizeof(tmp));
244 strcat(library_path, ";");
245 strcat(library_path, tmp);
246 strcat(library_path, PACKAGE_DIR BIN_DIR);
247
248 GetSystemDirectory(tmp, sizeof(tmp));
249 strcat(library_path, ";");
250 strcat(library_path, tmp);
251
252 GetWindowsDirectory(tmp, sizeof(tmp));
253 strcat(library_path, ";");
254 strcat(library_path, tmp);
255
256 if (path_str) {
257 strcat(library_path, ";");
258 strcat(library_path, path_str);
259 }
260
261 strcat(library_path, ";.");
262
263 Arguments::set_library_path(library_path);
264 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
265 }
266
267 /* Default extensions directory */
268 {
269 char path[MAX_PATH];
270 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
271 GetWindowsDirectory(path, MAX_PATH);
272 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
273 path, PACKAGE_DIR, EXT_DIR);
274 Arguments::set_ext_dirs(buf);
275 }
276 #undef EXT_DIR
277 #undef BIN_DIR
278 #undef PACKAGE_DIR
279
280 /* Default endorsed standards directory. */
281 {
282 #define ENDORSED_DIR "\\lib\\endorsed"
283 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
284 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
285 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
286 Arguments::set_endorsed_dirs(buf);
287 #undef ENDORSED_DIR
288 }
289
290 #ifndef _WIN64
291 // set our UnhandledExceptionFilter and save any previous one
292 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
293 #endif
294
295 // Done
296 return;
297 }
298
299 void os::breakpoint() {
300 DebugBreak();
301 }
302
303 // Invoked from the BREAKPOINT Macro
304 extern "C" void breakpoint() {
305 os::breakpoint();
306 }
307
308 /*
309 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
310 * So far, this method is only used by Native Memory Tracking, which is
311 * only supported on Windows XP or later.
312 */
313 address os::get_caller_pc(int n) {
314 #ifdef _NMT_NOINLINE_
315 n ++;
316 #endif
317 address pc;
318 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
319 return pc;
320 }
321 return NULL;
322 }
323
324
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
330
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
335
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
339
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while( 1 )
343 {
344 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
345 if ( stack_bottom == (address)minfo.AllocationBase )
346 stack_size += minfo.RegionSize;
347 else
348 break;
349 }
350
351 #ifdef _M_IA64
352 // IA64 has memory and register stacks
353 //
354 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
355 // at thread creation (1MB backing store growing upwards, 1MB memory stack
356 // growing downwards, 2MB summed up)
357 //
358 // ...
359 // ------- top of stack (high address) -----
360 // |
361 // | 1MB
362 // | Backing Store (Register Stack)
363 // |
364 // | / \
365 // | |
366 // | |
367 // | |
368 // ------------------------ stack base -----
369 // | 1MB
370 // | Memory Stack
371 // |
372 // | |
373 // | |
374 // | |
375 // | \ /
376 // |
377 // ----- bottom of stack (low address) -----
378 // ...
379
380 stack_size = stack_size / 2;
381 #endif
382 return stack_bottom + stack_size;
383 }
384
385 size_t os::current_stack_size() {
386 size_t sz;
387 MEMORY_BASIC_INFORMATION minfo;
388 VirtualQuery(&minfo, &minfo, sizeof(minfo));
389 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
390 return sz;
391 }
392
393 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
394 const struct tm* time_struct_ptr = localtime(clock);
395 if (time_struct_ptr != NULL) {
396 *res = *time_struct_ptr;
397 return res;
398 }
399 return NULL;
400 }
401
402 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
403
404 // Thread start routine for all new Java threads
405 static unsigned __stdcall java_start(Thread* thread) {
406 // Try to randomize the cache line index of hot stack frames.
407 // This helps when threads of the same stack traces evict each other's
408 // cache lines. The threads can be either from the same JVM instance, or
409 // from different JVM instances. The benefit is especially true for
410 // processors with hyperthreading technology.
411 static int counter = 0;
412 int pid = os::current_process_id();
413 _alloca(((pid ^ counter++) & 7) * 128);
414
415 OSThread* osthr = thread->osthread();
416 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
417
418 if (UseNUMA) {
419 int lgrp_id = os::numa_get_group_id();
420 if (lgrp_id != -1) {
421 thread->set_lgrp_id(lgrp_id);
422 }
423 }
424
425
426 // Install a win32 structured exception handler around every thread created
427 // by VM, so VM can genrate error dump when an exception occurred in non-
428 // Java thread (e.g. VM thread).
429 __try {
430 thread->run();
431 } __except(topLevelExceptionFilter(
432 (_EXCEPTION_POINTERS*)_exception_info())) {
433 // Nothing to do.
434 }
435
436 // One less thread is executing
437 // When the VMThread gets here, the main thread may have already exited
438 // which frees the CodeHeap containing the Atomic::add code
439 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
440 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
441 }
442
443 return 0;
444 }
445
446 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
450
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
458
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
462
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
469
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
472
473 return osthread;
474 }
475
476
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
491
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
494
495 thread->set_osthread(osthread);
496 return true;
497 }
498
499 bool os::create_main_thread(JavaThread* thread) {
500 #ifdef ASSERT
501 thread->verify_not_published();
502 #endif
503 if (_starting_thread == NULL) {
504 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
505 if (_starting_thread == NULL) {
506 return false;
507 }
508 }
509
510 // The primordial thread is runnable from the start)
511 _starting_thread->set_state(RUNNABLE);
512
513 thread->set_osthread(_starting_thread);
514 return true;
515 }
516
517 // Allocate and initialize a new OSThread
518 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
519 unsigned thread_id;
520
521 // Allocate the OSThread object
522 OSThread* osthread = new OSThread(NULL, NULL);
523 if (osthread == NULL) {
524 return false;
525 }
526
527 // Initialize support for Java interrupts
528 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
529 if (interrupt_event == NULL) {
530 delete osthread;
531 return NULL;
532 }
533 osthread->set_interrupt_event(interrupt_event);
534 osthread->set_interrupted(false);
535
536 thread->set_osthread(osthread);
537
538 if (stack_size == 0) {
539 switch (thr_type) {
540 case os::java_thread:
541 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
542 if (JavaThread::stack_size_at_create() > 0)
543 stack_size = JavaThread::stack_size_at_create();
544 break;
545 case os::compiler_thread:
546 if (CompilerThreadStackSize > 0) {
547 stack_size = (size_t)(CompilerThreadStackSize * K);
548 break;
549 } // else fall through:
550 // use VMThreadStackSize if CompilerThreadStackSize is not defined
551 case os::vm_thread:
552 case os::pgc_thread:
553 case os::cgc_thread:
554 case os::watcher_thread:
555 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
556 break;
557 }
558 }
559
560 // Create the Win32 thread
561 //
562 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
563 // does not specify stack size. Instead, it specifies the size of
564 // initially committed space. The stack size is determined by
565 // PE header in the executable. If the committed "stack_size" is larger
566 // than default value in the PE header, the stack is rounded up to the
567 // nearest multiple of 1MB. For example if the launcher has default
568 // stack size of 320k, specifying any size less than 320k does not
569 // affect the actual stack size at all, it only affects the initial
570 // commitment. On the other hand, specifying 'stack_size' larger than
571 // default value may cause significant increase in memory usage, because
572 // not only the stack space will be rounded up to MB, but also the
573 // entire space is committed upfront.
574 //
575 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
576 // for CreateThread() that can treat 'stack_size' as stack size. However we
577 // are not supposed to call CreateThread() directly according to MSDN
578 // document because JVM uses C runtime library. The good news is that the
579 // flag appears to work with _beginthredex() as well.
580
581 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
582 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
583 #endif
584
585 HANDLE thread_handle =
586 (HANDLE)_beginthreadex(NULL,
587 (unsigned)stack_size,
588 (unsigned (__stdcall *)(void*)) java_start,
589 thread,
590 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
591 &thread_id);
592 if (thread_handle == NULL) {
593 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
594 // without the flag.
595 thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED,
601 &thread_id);
602 }
603 if (thread_handle == NULL) {
604 // Need to clean up stuff we've allocated so far
605 CloseHandle(osthread->interrupt_event());
606 thread->set_osthread(NULL);
607 delete osthread;
608 return NULL;
609 }
610
611 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
612
613 // Store info on the Win32 thread into the OSThread
614 osthread->set_thread_handle(thread_handle);
615 osthread->set_thread_id(thread_id);
616
617 // Initial thread state is INITIALIZED, not SUSPENDED
618 osthread->set_state(INITIALIZED);
619
620 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
621 return true;
622 }
623
624
625 // Free Win32 resources related to the OSThread
626 void os::free_thread(OSThread* osthread) {
627 assert(osthread != NULL, "osthread not set");
628 CloseHandle(osthread->thread_handle());
629 CloseHandle(osthread->interrupt_event());
630 delete osthread;
631 }
632
633
634 static int has_performance_count = 0;
635 static jlong first_filetime;
636 static jlong initial_performance_count;
637 static jlong performance_frequency;
638
639
640 jlong as_long(LARGE_INTEGER x) {
641 jlong result = 0; // initialization to avoid warning
642 set_high(&result, x.HighPart);
643 set_low(&result, x.LowPart);
644 return result;
645 }
646
647
648 jlong os::elapsed_counter() {
649 LARGE_INTEGER count;
650 if (has_performance_count) {
651 QueryPerformanceCounter(&count);
652 return as_long(count) - initial_performance_count;
653 } else {
654 FILETIME wt;
655 GetSystemTimeAsFileTime(&wt);
656 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
657 }
658 }
659
660
661 jlong os::elapsed_frequency() {
662 if (has_performance_count) {
663 return performance_frequency;
664 } else {
665 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
666 return 10000000;
667 }
668 }
669
670
671 julong os::available_memory() {
672 return win32::available_memory();
673 }
674
675 julong os::win32::available_memory() {
676 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
677 // value if total memory is larger than 4GB
678 MEMORYSTATUSEX ms;
679 ms.dwLength = sizeof(ms);
680 GlobalMemoryStatusEx(&ms);
681
682 return (julong)ms.ullAvailPhys;
683 }
684
685 julong os::physical_memory() {
686 return win32::physical_memory();
687 }
688
689 bool os::has_allocatable_memory_limit(julong* limit) {
690 MEMORYSTATUSEX ms;
691 ms.dwLength = sizeof(ms);
692 GlobalMemoryStatusEx(&ms);
693 #ifdef _LP64
694 *limit = (julong)ms.ullAvailVirtual;
695 return true;
696 #else
697 // Limit to 1400m because of the 2gb address space wall
698 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
699 return true;
700 #endif
701 }
702
703 // VC6 lacks DWORD_PTR
704 #if _MSC_VER < 1300
705 typedef UINT_PTR DWORD_PTR;
706 #endif
707
708 int os::active_processor_count() {
709 DWORD_PTR lpProcessAffinityMask = 0;
710 DWORD_PTR lpSystemAffinityMask = 0;
711 int proc_count = processor_count();
712 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
713 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
714 // Nof active processors is number of bits in process affinity mask
715 int bitcount = 0;
716 while (lpProcessAffinityMask != 0) {
717 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
718 bitcount++;
719 }
720 return bitcount;
721 } else {
722 return proc_count;
723 }
724 }
725
726 void os::set_native_thread_name(const char *name) {
727 // Not yet implemented.
728 return;
729 }
730
731 bool os::distribute_processes(uint length, uint* distribution) {
732 // Not yet implemented.
733 return false;
734 }
735
736 bool os::bind_to_processor(uint processor_id) {
737 // Not yet implemented.
738 return false;
739 }
740
741 static void initialize_performance_counter() {
742 LARGE_INTEGER count;
743 if (QueryPerformanceFrequency(&count)) {
744 has_performance_count = 1;
745 performance_frequency = as_long(count);
746 QueryPerformanceCounter(&count);
747 initial_performance_count = as_long(count);
748 } else {
749 has_performance_count = 0;
750 FILETIME wt;
751 GetSystemTimeAsFileTime(&wt);
752 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
753 }
754 }
755
756
757 double os::elapsedTime() {
758 return (double) elapsed_counter() / (double) elapsed_frequency();
759 }
760
761
762 // Windows format:
763 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
764 // Java format:
765 // Java standards require the number of milliseconds since 1/1/1970
766
767 // Constant offset - calculated using offset()
768 static jlong _offset = 116444736000000000;
769 // Fake time counter for reproducible results when debugging
770 static jlong fake_time = 0;
771
772 #ifdef ASSERT
773 // Just to be safe, recalculate the offset in debug mode
774 static jlong _calculated_offset = 0;
775 static int _has_calculated_offset = 0;
776
777 jlong offset() {
778 if (_has_calculated_offset) return _calculated_offset;
779 SYSTEMTIME java_origin;
780 java_origin.wYear = 1970;
781 java_origin.wMonth = 1;
782 java_origin.wDayOfWeek = 0; // ignored
783 java_origin.wDay = 1;
784 java_origin.wHour = 0;
785 java_origin.wMinute = 0;
786 java_origin.wSecond = 0;
787 java_origin.wMilliseconds = 0;
788 FILETIME jot;
789 if (!SystemTimeToFileTime(&java_origin, &jot)) {
790 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
791 }
792 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
793 _has_calculated_offset = 1;
794 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
795 return _calculated_offset;
796 }
797 #else
798 jlong offset() {
799 return _offset;
800 }
801 #endif
802
803 jlong windows_to_java_time(FILETIME wt) {
804 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
805 return (a - offset()) / 10000;
806 }
807
808 FILETIME java_to_windows_time(jlong l) {
809 jlong a = (l * 10000) + offset();
810 FILETIME result;
811 result.dwHighDateTime = high(a);
812 result.dwLowDateTime = low(a);
813 return result;
814 }
815
816 bool os::supports_vtime() { return true; }
817 bool os::enable_vtime() { return false; }
818 bool os::vtime_enabled() { return false; }
819
820 double os::elapsedVTime() {
821 FILETIME created;
822 FILETIME exited;
823 FILETIME kernel;
824 FILETIME user;
825 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
826 // the resolution of windows_to_java_time() should be sufficient (ms)
827 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
828 } else {
829 return elapsedTime();
830 }
831 }
832
833 jlong os::javaTimeMillis() {
834 if (UseFakeTimers) {
835 return fake_time++;
836 } else {
837 FILETIME wt;
838 GetSystemTimeAsFileTime(&wt);
839 return windows_to_java_time(wt);
840 }
841 }
842
843 jlong os::javaTimeNanos() {
844 if (!has_performance_count) {
845 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
846 } else {
847 LARGE_INTEGER current_count;
848 QueryPerformanceCounter(¤t_count);
849 double current = as_long(current_count);
850 double freq = performance_frequency;
851 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
852 return time;
853 }
854 }
855
856 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
857 if (!has_performance_count) {
858 // javaTimeMillis() doesn't have much percision,
859 // but it is not going to wrap -- so all 64 bits
860 info_ptr->max_value = ALL_64_BITS;
861
862 // this is a wall clock timer, so may skip
863 info_ptr->may_skip_backward = true;
864 info_ptr->may_skip_forward = true;
865 } else {
866 jlong freq = performance_frequency;
867 if (freq < NANOSECS_PER_SEC) {
868 // the performance counter is 64 bits and we will
869 // be multiplying it -- so no wrap in 64 bits
870 info_ptr->max_value = ALL_64_BITS;
871 } else if (freq > NANOSECS_PER_SEC) {
872 // use the max value the counter can reach to
873 // determine the max value which could be returned
874 julong max_counter = (julong)ALL_64_BITS;
875 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
876 } else {
877 // the performance counter is 64 bits and we will
878 // be using it directly -- so no wrap in 64 bits
879 info_ptr->max_value = ALL_64_BITS;
880 }
881
882 // using a counter, so no skipping
883 info_ptr->may_skip_backward = false;
884 info_ptr->may_skip_forward = false;
885 }
886 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
887 }
888
889 char* os::local_time_string(char *buf, size_t buflen) {
890 SYSTEMTIME st;
891 GetLocalTime(&st);
892 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
893 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
894 return buf;
895 }
896
897 bool os::getTimesSecs(double* process_real_time,
898 double* process_user_time,
899 double* process_system_time) {
900 HANDLE h_process = GetCurrentProcess();
901 FILETIME create_time, exit_time, kernel_time, user_time;
902 BOOL result = GetProcessTimes(h_process,
903 &create_time,
904 &exit_time,
905 &kernel_time,
906 &user_time);
907 if (result != 0) {
908 FILETIME wt;
909 GetSystemTimeAsFileTime(&wt);
910 jlong rtc_millis = windows_to_java_time(wt);
911 jlong user_millis = windows_to_java_time(user_time);
912 jlong system_millis = windows_to_java_time(kernel_time);
913 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
914 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
915 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
916 return true;
917 } else {
918 return false;
919 }
920 }
921
922 void os::shutdown() {
923
924 // allow PerfMemory to attempt cleanup of any persistent resources
925 perfMemory_exit();
926
927 // flush buffered output, finish log files
928 ostream_abort();
929
930 // Check for abort hook
931 abort_hook_t abort_hook = Arguments::abort_hook();
932 if (abort_hook != NULL) {
933 abort_hook();
934 }
935 }
936
937
938 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
939 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
940
941 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
942 HINSTANCE dbghelp;
943 EXCEPTION_POINTERS ep;
944 MINIDUMP_EXCEPTION_INFORMATION mei;
945 MINIDUMP_EXCEPTION_INFORMATION* pmei;
946
947 HANDLE hProcess = GetCurrentProcess();
948 DWORD processId = GetCurrentProcessId();
949 HANDLE dumpFile;
950 MINIDUMP_TYPE dumpType;
951 static const char* cwd;
952
953 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
954 #ifndef ASSERT
955 // If running on a client version of Windows and user has not explicitly enabled dumping
956 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
957 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
958 return;
959 // If running on a server version of Windows and user has explictly disabled dumping
960 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
961 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
962 return;
963 }
964 #else
965 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
966 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
967 return;
968 }
969 #endif
970
971 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
972
973 if (dbghelp == NULL) {
974 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
975 return;
976 }
977
978 _MiniDumpWriteDump = CAST_TO_FN_PTR(
979 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
980 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
981 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
982
983 if (_MiniDumpWriteDump == NULL) {
984 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
985 return;
986 }
987
988 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
989
990 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
991 // API_VERSION_NUMBER 11 or higher contains the ones we want though
992 #if API_VERSION_NUMBER >= 11
993 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
994 MiniDumpWithUnloadedModules);
995 #endif
996
997 cwd = get_current_directory(NULL, 0);
998 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
999 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1000
1001 if (dumpFile == INVALID_HANDLE_VALUE) {
1002 VMError::report_coredump_status("Failed to create file for dumping", false);
1003 return;
1004 }
1005 if (exceptionRecord != NULL && contextRecord != NULL) {
1006 ep.ContextRecord = (PCONTEXT) contextRecord;
1007 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1008
1009 mei.ThreadId = GetCurrentThreadId();
1010 mei.ExceptionPointers = &ep;
1011 pmei = &mei;
1012 } else {
1013 pmei = NULL;
1014 }
1015
1016
1017 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1018 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1019 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1020 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1021 DWORD error = GetLastError();
1022 LPTSTR msgbuf = NULL;
1023
1024 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1025 FORMAT_MESSAGE_FROM_SYSTEM |
1026 FORMAT_MESSAGE_IGNORE_INSERTS,
1027 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1028
1029 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1030 LocalFree(msgbuf);
1031 } else {
1032 // Call to FormatMessage failed, just include the result from GetLastError
1033 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1034 }
1035 VMError::report_coredump_status(buffer, false);
1036 } else {
1037 VMError::report_coredump_status(buffer, true);
1038 }
1039
1040 CloseHandle(dumpFile);
1041 }
1042
1043
1044
1045 void os::abort(bool dump_core)
1046 {
1047 os::shutdown();
1048 // no core dump on Windows
1049 ::exit(1);
1050 }
1051
1052 // Die immediately, no exit hook, no abort hook, no cleanup.
1053 void os::die() {
1054 _exit(-1);
1055 }
1056
1057 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1058 // * dirent_md.c 1.15 00/02/02
1059 //
1060 // The declarations for DIR and struct dirent are in jvm_win32.h.
1061
1062 /* Caller must have already run dirname through JVM_NativePath, which removes
1063 duplicate slashes and converts all instances of '/' into '\\'. */
1064
1065 DIR *
1066 os::opendir(const char *dirname)
1067 {
1068 assert(dirname != NULL, "just checking"); // hotspot change
1069 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1070 DWORD fattr; // hotspot change
1071 char alt_dirname[4] = { 0, 0, 0, 0 };
1072
1073 if (dirp == 0) {
1074 errno = ENOMEM;
1075 return 0;
1076 }
1077
1078 /*
1079 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1080 * as a directory in FindFirstFile(). We detect this case here and
1081 * prepend the current drive name.
1082 */
1083 if (dirname[1] == '\0' && dirname[0] == '\\') {
1084 alt_dirname[0] = _getdrive() + 'A' - 1;
1085 alt_dirname[1] = ':';
1086 alt_dirname[2] = '\\';
1087 alt_dirname[3] = '\0';
1088 dirname = alt_dirname;
1089 }
1090
1091 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1092 if (dirp->path == 0) {
1093 free(dirp, mtInternal);
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097 strcpy(dirp->path, dirname);
1098
1099 fattr = GetFileAttributes(dirp->path);
1100 if (fattr == 0xffffffff) {
1101 free(dirp->path, mtInternal);
1102 free(dirp, mtInternal);
1103 errno = ENOENT;
1104 return 0;
1105 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1106 free(dirp->path, mtInternal);
1107 free(dirp, mtInternal);
1108 errno = ENOTDIR;
1109 return 0;
1110 }
1111
1112 /* Append "*.*", or possibly "\\*.*", to path */
1113 if (dirp->path[1] == ':'
1114 && (dirp->path[2] == '\0'
1115 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1116 /* No '\\' needed for cases like "Z:" or "Z:\" */
1117 strcat(dirp->path, "*.*");
1118 } else {
1119 strcat(dirp->path, "\\*.*");
1120 }
1121
1122 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1123 if (dirp->handle == INVALID_HANDLE_VALUE) {
1124 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1125 free(dirp->path, mtInternal);
1126 free(dirp, mtInternal);
1127 errno = EACCES;
1128 return 0;
1129 }
1130 }
1131 return dirp;
1132 }
1133
1134 /* parameter dbuf unused on Windows */
1135
1136 struct dirent *
1137 os::readdir(DIR *dirp, dirent *dbuf)
1138 {
1139 assert(dirp != NULL, "just checking"); // hotspot change
1140 if (dirp->handle == INVALID_HANDLE_VALUE) {
1141 return 0;
1142 }
1143
1144 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1145
1146 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1147 if (GetLastError() == ERROR_INVALID_HANDLE) {
1148 errno = EBADF;
1149 return 0;
1150 }
1151 FindClose(dirp->handle);
1152 dirp->handle = INVALID_HANDLE_VALUE;
1153 }
1154
1155 return &dirp->dirent;
1156 }
1157
1158 int
1159 os::closedir(DIR *dirp)
1160 {
1161 assert(dirp != NULL, "just checking"); // hotspot change
1162 if (dirp->handle != INVALID_HANDLE_VALUE) {
1163 if (!FindClose(dirp->handle)) {
1164 errno = EBADF;
1165 return -1;
1166 }
1167 dirp->handle = INVALID_HANDLE_VALUE;
1168 }
1169 free(dirp->path, mtInternal);
1170 free(dirp, mtInternal);
1171 return 0;
1172 }
1173
1174 // This must be hard coded because it's the system's temporary
1175 // directory not the java application's temp directory, ala java.io.tmpdir.
1176 const char* os::get_temp_directory() {
1177 static char path_buf[MAX_PATH];
1178 if (GetTempPath(MAX_PATH, path_buf)>0)
1179 return path_buf;
1180 else{
1181 path_buf[0]='\0';
1182 return path_buf;
1183 }
1184 }
1185
1186 static bool file_exists(const char* filename) {
1187 if (filename == NULL || strlen(filename) == 0) {
1188 return false;
1189 }
1190 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1191 }
1192
1193 bool os::dll_build_name(char *buffer, size_t buflen,
1194 const char* pname, const char* fname) {
1195 bool retval = false;
1196 const size_t pnamelen = pname ? strlen(pname) : 0;
1197 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1198
1199 // Return error on buffer overflow.
1200 if (pnamelen + strlen(fname) + 10 > buflen) {
1201 return retval;
1202 }
1203
1204 if (pnamelen == 0) {
1205 jio_snprintf(buffer, buflen, "%s.dll", fname);
1206 retval = true;
1207 } else if (c == ':' || c == '\\') {
1208 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1209 retval = true;
1210 } else if (strchr(pname, *os::path_separator()) != NULL) {
1211 int n;
1212 char** pelements = split_path(pname, &n);
1213 if (pelements == NULL) {
1214 return false;
1215 }
1216 for (int i = 0 ; i < n ; i++) {
1217 char* path = pelements[i];
1218 // Really shouldn't be NULL, but check can't hurt
1219 size_t plen = (path == NULL) ? 0 : strlen(path);
1220 if (plen == 0) {
1221 continue; // skip the empty path values
1222 }
1223 const char lastchar = path[plen - 1];
1224 if (lastchar == ':' || lastchar == '\\') {
1225 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1226 } else {
1227 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1228 }
1229 if (file_exists(buffer)) {
1230 retval = true;
1231 break;
1232 }
1233 }
1234 // release the storage
1235 for (int i = 0 ; i < n ; i++) {
1236 if (pelements[i] != NULL) {
1237 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1238 }
1239 }
1240 if (pelements != NULL) {
1241 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1242 }
1243 } else {
1244 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1245 retval = true;
1246 }
1247 return retval;
1248 }
1249
1250 // Needs to be in os specific directory because windows requires another
1251 // header file <direct.h>
1252 const char* os::get_current_directory(char *buf, size_t buflen) {
1253 int n = static_cast<int>(buflen);
1254 if (buflen > INT_MAX) n = INT_MAX;
1255 return _getcwd(buf, n);
1256 }
1257
1258 //-----------------------------------------------------------
1259 // Helper functions for fatal error handler
1260 #ifdef _WIN64
1261 // Helper routine which returns true if address in
1262 // within the NTDLL address space.
1263 //
1264 static bool _addr_in_ntdll( address addr )
1265 {
1266 HMODULE hmod;
1267 MODULEINFO minfo;
1268
1269 hmod = GetModuleHandle("NTDLL.DLL");
1270 if ( hmod == NULL ) return false;
1271 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1272 &minfo, sizeof(MODULEINFO)) )
1273 return false;
1274
1275 if ( (addr >= minfo.lpBaseOfDll) &&
1276 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1277 return true;
1278 else
1279 return false;
1280 }
1281 #endif
1282
1283
1284 // Enumerate all modules for a given process ID
1285 //
1286 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1287 // different API for doing this. We use PSAPI.DLL on NT based
1288 // Windows and ToolHelp on 95/98/Me.
1289
1290 // Callback function that is called by enumerate_modules() on
1291 // every DLL module.
1292 // Input parameters:
1293 // int pid,
1294 // char* module_file_name,
1295 // address module_base_addr,
1296 // unsigned module_size,
1297 // void* param
1298 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1299
1300 // enumerate_modules for Windows NT, using PSAPI
1301 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1302 {
1303 HANDLE hProcess ;
1304
1305 # define MAX_NUM_MODULES 128
1306 HMODULE modules[MAX_NUM_MODULES];
1307 static char filename[ MAX_PATH ];
1308 int result = 0;
1309
1310 if (!os::PSApiDll::PSApiAvailable()) {
1311 return 0;
1312 }
1313
1314 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1315 FALSE, pid ) ;
1316 if (hProcess == NULL) return 0;
1317
1318 DWORD size_needed;
1319 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1320 sizeof(modules), &size_needed)) {
1321 CloseHandle( hProcess );
1322 return 0;
1323 }
1324
1325 // number of modules that are currently loaded
1326 int num_modules = size_needed / sizeof(HMODULE);
1327
1328 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1329 // Get Full pathname:
1330 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1331 filename, sizeof(filename))) {
1332 filename[0] = '\0';
1333 }
1334
1335 MODULEINFO modinfo;
1336 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1337 &modinfo, sizeof(modinfo))) {
1338 modinfo.lpBaseOfDll = NULL;
1339 modinfo.SizeOfImage = 0;
1340 }
1341
1342 // Invoke callback function
1343 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1344 modinfo.SizeOfImage, param);
1345 if (result) break;
1346 }
1347
1348 CloseHandle( hProcess ) ;
1349 return result;
1350 }
1351
1352
1353 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1354 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1355 {
1356 HANDLE hSnapShot ;
1357 static MODULEENTRY32 modentry ;
1358 int result = 0;
1359
1360 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1361 return 0;
1362 }
1363
1364 // Get a handle to a Toolhelp snapshot of the system
1365 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1366 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1367 return FALSE ;
1368 }
1369
1370 // iterate through all modules
1371 modentry.dwSize = sizeof(MODULEENTRY32) ;
1372 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1373
1374 while( not_done ) {
1375 // invoke the callback
1376 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1377 modentry.modBaseSize, param);
1378 if (result) break;
1379
1380 modentry.dwSize = sizeof(MODULEENTRY32) ;
1381 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1382 }
1383
1384 CloseHandle(hSnapShot);
1385 return result;
1386 }
1387
1388 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1389 {
1390 // Get current process ID if caller doesn't provide it.
1391 if (!pid) pid = os::current_process_id();
1392
1393 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1394 else return _enumerate_modules_windows(pid, func, param);
1395 }
1396
1397 struct _modinfo {
1398 address addr;
1399 char* full_path; // point to a char buffer
1400 int buflen; // size of the buffer
1401 address base_addr;
1402 };
1403
1404 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1405 unsigned size, void * param) {
1406 struct _modinfo *pmod = (struct _modinfo *)param;
1407 if (!pmod) return -1;
1408
1409 if (base_addr <= pmod->addr &&
1410 base_addr+size > pmod->addr) {
1411 // if a buffer is provided, copy path name to the buffer
1412 if (pmod->full_path) {
1413 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1414 }
1415 pmod->base_addr = base_addr;
1416 return 1;
1417 }
1418 return 0;
1419 }
1420
1421 bool os::dll_address_to_library_name(address addr, char* buf,
1422 int buflen, int* offset) {
1423 // buf is not optional, but offset is optional
1424 assert(buf != NULL, "sanity check");
1425
1426 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1427 // return the full path to the DLL file, sometimes it returns path
1428 // to the corresponding PDB file (debug info); sometimes it only
1429 // returns partial path, which makes life painful.
1430
1431 struct _modinfo mi;
1432 mi.addr = addr;
1433 mi.full_path = buf;
1434 mi.buflen = buflen;
1435 int pid = os::current_process_id();
1436 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1437 // buf already contains path name
1438 if (offset) *offset = addr - mi.base_addr;
1439 return true;
1440 }
1441
1442 buf[0] = '\0';
1443 if (offset) *offset = -1;
1444 return false;
1445 }
1446
1447 bool os::dll_address_to_function_name(address addr, char *buf,
1448 int buflen, int *offset) {
1449 // buf is not optional, but offset is optional
1450 assert(buf != NULL, "sanity check");
1451
1452 if (Decoder::decode(addr, buf, buflen, offset)) {
1453 return true;
1454 }
1455 if (offset != NULL) *offset = -1;
1456 buf[0] = '\0';
1457 return false;
1458 }
1459
1460 // save the start and end address of jvm.dll into param[0] and param[1]
1461 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1462 unsigned size, void * param) {
1463 if (!param) return -1;
1464
1465 if (base_addr <= (address)_locate_jvm_dll &&
1466 base_addr+size > (address)_locate_jvm_dll) {
1467 ((address*)param)[0] = base_addr;
1468 ((address*)param)[1] = base_addr + size;
1469 return 1;
1470 }
1471 return 0;
1472 }
1473
1474 address vm_lib_location[2]; // start and end address of jvm.dll
1475
1476 // check if addr is inside jvm.dll
1477 bool os::address_is_in_vm(address addr) {
1478 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1479 int pid = os::current_process_id();
1480 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1481 assert(false, "Can't find jvm module.");
1482 return false;
1483 }
1484 }
1485
1486 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1487 }
1488
1489 // print module info; param is outputStream*
1490 static int _print_module(int pid, char* fname, address base,
1491 unsigned size, void* param) {
1492 if (!param) return -1;
1493
1494 outputStream* st = (outputStream*)param;
1495
1496 address end_addr = base + size;
1497 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1498 return 0;
1499 }
1500
1501 // Loads .dll/.so and
1502 // in case of error it checks if .dll/.so was built for the
1503 // same architecture as Hotspot is running on
1504 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1505 {
1506 void * result = LoadLibrary(name);
1507 if (result != NULL)
1508 {
1509 return result;
1510 }
1511
1512 DWORD errcode = GetLastError();
1513 if (errcode == ERROR_MOD_NOT_FOUND) {
1514 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1515 ebuf[ebuflen-1]='\0';
1516 return NULL;
1517 }
1518
1519 // Parsing dll below
1520 // If we can read dll-info and find that dll was built
1521 // for an architecture other than Hotspot is running in
1522 // - then print to buffer "DLL was built for a different architecture"
1523 // else call os::lasterror to obtain system error message
1524
1525 // Read system error message into ebuf
1526 // It may or may not be overwritten below (in the for loop and just above)
1527 lasterror(ebuf, (size_t) ebuflen);
1528 ebuf[ebuflen-1]='\0';
1529 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1530 if (file_descriptor<0)
1531 {
1532 return NULL;
1533 }
1534
1535 uint32_t signature_offset;
1536 uint16_t lib_arch=0;
1537 bool failed_to_get_lib_arch=
1538 (
1539 //Go to position 3c in the dll
1540 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1541 ||
1542 // Read loacation of signature
1543 (sizeof(signature_offset)!=
1544 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1545 ||
1546 //Go to COFF File Header in dll
1547 //that is located after"signature" (4 bytes long)
1548 (os::seek_to_file_offset(file_descriptor,
1549 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1550 ||
1551 //Read field that contains code of architecture
1552 // that dll was build for
1553 (sizeof(lib_arch)!=
1554 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1555 );
1556
1557 ::close(file_descriptor);
1558 if (failed_to_get_lib_arch)
1559 {
1560 // file i/o error - report os::lasterror(...) msg
1561 return NULL;
1562 }
1563
1564 typedef struct
1565 {
1566 uint16_t arch_code;
1567 char* arch_name;
1568 } arch_t;
1569
1570 static const arch_t arch_array[]={
1571 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1572 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1573 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1574 };
1575 #if (defined _M_IA64)
1576 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1577 #elif (defined _M_AMD64)
1578 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1579 #elif (defined _M_IX86)
1580 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1581 #else
1582 #error Method os::dll_load requires that one of following \
1583 is defined :_M_IA64,_M_AMD64 or _M_IX86
1584 #endif
1585
1586
1587 // Obtain a string for printf operation
1588 // lib_arch_str shall contain string what platform this .dll was built for
1589 // running_arch_str shall string contain what platform Hotspot was built for
1590 char *running_arch_str=NULL,*lib_arch_str=NULL;
1591 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1592 {
1593 if (lib_arch==arch_array[i].arch_code)
1594 lib_arch_str=arch_array[i].arch_name;
1595 if (running_arch==arch_array[i].arch_code)
1596 running_arch_str=arch_array[i].arch_name;
1597 }
1598
1599 assert(running_arch_str,
1600 "Didn't find runing architecture code in arch_array");
1601
1602 // If the architure is right
1603 // but some other error took place - report os::lasterror(...) msg
1604 if (lib_arch == running_arch)
1605 {
1606 return NULL;
1607 }
1608
1609 if (lib_arch_str!=NULL)
1610 {
1611 ::_snprintf(ebuf, ebuflen-1,
1612 "Can't load %s-bit .dll on a %s-bit platform",
1613 lib_arch_str,running_arch_str);
1614 }
1615 else
1616 {
1617 // don't know what architecture this dll was build for
1618 ::_snprintf(ebuf, ebuflen-1,
1619 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1620 lib_arch,running_arch_str);
1621 }
1622
1623 return NULL;
1624 }
1625
1626
1627 void os::print_dll_info(outputStream *st) {
1628 int pid = os::current_process_id();
1629 st->print_cr("Dynamic libraries:");
1630 enumerate_modules(pid, _print_module, (void *)st);
1631 }
1632
1633 void os::print_os_info_brief(outputStream* st) {
1634 os::print_os_info(st);
1635 }
1636
1637 void os::print_os_info(outputStream* st) {
1638 st->print("OS:");
1639
1640 os::win32::print_windows_version(st);
1641 }
1642
1643 void os::win32::print_windows_version(outputStream* st) {
1644 OSVERSIONINFOEX osvi;
1645 SYSTEM_INFO si;
1646
1647 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1648 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1649
1650 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1651 st->print_cr("N/A");
1652 return;
1653 }
1654
1655 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1656
1657 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1658 if (os_vers >= 5002) {
1659 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1660 // find out whether we are running on 64 bit processor or not.
1661 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) {
1662 os::Kernel32Dll::GetNativeSystemInfo(&si);
1663 } else {
1664 GetSystemInfo(&si);
1665 }
1666 }
1667
1668 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1669 switch (os_vers) {
1670 case 3051: st->print(" Windows NT 3.51"); break;
1671 case 4000: st->print(" Windows NT 4.0"); break;
1672 case 5000: st->print(" Windows 2000"); break;
1673 case 5001: st->print(" Windows XP"); break;
1674 case 5002:
1675 if (osvi.wProductType == VER_NT_WORKSTATION &&
1676 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1677 st->print(" Windows XP x64 Edition");
1678 } else {
1679 st->print(" Windows Server 2003 family");
1680 }
1681 break;
1682
1683 case 6000:
1684 if (osvi.wProductType == VER_NT_WORKSTATION) {
1685 st->print(" Windows Vista");
1686 } else {
1687 st->print(" Windows Server 2008");
1688 }
1689 break;
1690
1691 case 6001:
1692 if (osvi.wProductType == VER_NT_WORKSTATION) {
1693 st->print(" Windows 7");
1694 } else {
1695 st->print(" Windows Server 2008 R2");
1696 }
1697 break;
1698
1699 case 6002:
1700 if (osvi.wProductType == VER_NT_WORKSTATION) {
1701 st->print(" Windows 8");
1702 } else {
1703 st->print(" Windows Server 2012");
1704 }
1705 break;
1706
1707 case 6003:
1708 if (osvi.wProductType == VER_NT_WORKSTATION) {
1709 st->print(" Windows 8.1");
1710 } else {
1711 st->print(" Windows Server 2012 R2");
1712 }
1713 break;
1714
1715 default: // future os
1716 // Unrecognized windows, print out its major and minor versions
1717 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1718 }
1719 } else {
1720 switch (os_vers) {
1721 case 4000: st->print(" Windows 95"); break;
1722 case 4010: st->print(" Windows 98"); break;
1723 case 4090: st->print(" Windows Me"); break;
1724 default: // future windows, print out its major and minor versions
1725 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1726 }
1727 }
1728
1729 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1730 st->print(" , 64 bit");
1731 }
1732
1733 st->print(" Build %d", osvi.dwBuildNumber);
1734 st->print(" %s", osvi.szCSDVersion); // service pack
1735 st->cr();
1736 }
1737
1738 void os::pd_print_cpu_info(outputStream* st) {
1739 // Nothing to do for now.
1740 }
1741
1742 void os::print_memory_info(outputStream* st) {
1743 st->print("Memory:");
1744 st->print(" %dk page", os::vm_page_size()>>10);
1745
1746 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1747 // value if total memory is larger than 4GB
1748 MEMORYSTATUSEX ms;
1749 ms.dwLength = sizeof(ms);
1750 GlobalMemoryStatusEx(&ms);
1751
1752 st->print(", physical %uk", os::physical_memory() >> 10);
1753 st->print("(%uk free)", os::available_memory() >> 10);
1754
1755 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1756 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1757 st->cr();
1758 }
1759
1760 void os::print_siginfo(outputStream *st, void *siginfo) {
1761 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1762 st->print("siginfo:");
1763 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1764
1765 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1766 er->NumberParameters >= 2) {
1767 switch (er->ExceptionInformation[0]) {
1768 case 0: st->print(", reading address"); break;
1769 case 1: st->print(", writing address"); break;
1770 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1771 er->ExceptionInformation[0]);
1772 }
1773 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1774 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1775 er->NumberParameters >= 2 && UseSharedSpaces) {
1776 FileMapInfo* mapinfo = FileMapInfo::current_info();
1777 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1778 st->print("\n\nError accessing class data sharing archive." \
1779 " Mapped file inaccessible during execution, " \
1780 " possible disk/network problem.");
1781 }
1782 } else {
1783 int num = er->NumberParameters;
1784 if (num > 0) {
1785 st->print(", ExceptionInformation=");
1786 for (int i = 0; i < num; i++) {
1787 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1788 }
1789 }
1790 }
1791 st->cr();
1792 }
1793
1794 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1795 // do nothing
1796 }
1797
1798 static char saved_jvm_path[MAX_PATH] = {0};
1799
1800 // Find the full path to the current module, jvm.dll
1801 void os::jvm_path(char *buf, jint buflen) {
1802 // Error checking.
1803 if (buflen < MAX_PATH) {
1804 assert(false, "must use a large-enough buffer");
1805 buf[0] = '\0';
1806 return;
1807 }
1808 // Lazy resolve the path to current module.
1809 if (saved_jvm_path[0] != 0) {
1810 strcpy(buf, saved_jvm_path);
1811 return;
1812 }
1813
1814 buf[0] = '\0';
1815 if (Arguments::created_by_gamma_launcher()) {
1816 // Support for the gamma launcher. Check for an
1817 // JAVA_HOME environment variable
1818 // and fix up the path so it looks like
1819 // libjvm.so is installed there (append a fake suffix
1820 // hotspot/libjvm.so).
1821 char* java_home_var = ::getenv("JAVA_HOME");
1822 if (java_home_var != NULL && java_home_var[0] != 0) {
1823
1824 strncpy(buf, java_home_var, buflen);
1825
1826 // determine if this is a legacy image or modules image
1827 // modules image doesn't have "jre" subdirectory
1828 size_t len = strlen(buf);
1829 char* jrebin_p = buf + len;
1830 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1831 if (0 != _access(buf, 0)) {
1832 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1833 }
1834 len = strlen(buf);
1835 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1836 }
1837 }
1838
1839 if(buf[0] == '\0') {
1840 GetModuleFileName(vm_lib_handle, buf, buflen);
1841 }
1842 strcpy(saved_jvm_path, buf);
1843 }
1844
1845
1846 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1847 #ifndef _WIN64
1848 st->print("_");
1849 #endif
1850 }
1851
1852
1853 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1854 #ifndef _WIN64
1855 st->print("@%d", args_size * sizeof(int));
1856 #endif
1857 }
1858
1859 // This method is a copy of JDK's sysGetLastErrorString
1860 // from src/windows/hpi/src/system_md.c
1861
1862 size_t os::lasterror(char* buf, size_t len) {
1863 DWORD errval;
1864
1865 if ((errval = GetLastError()) != 0) {
1866 // DOS error
1867 size_t n = (size_t)FormatMessage(
1868 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1869 NULL,
1870 errval,
1871 0,
1872 buf,
1873 (DWORD)len,
1874 NULL);
1875 if (n > 3) {
1876 // Drop final '.', CR, LF
1877 if (buf[n - 1] == '\n') n--;
1878 if (buf[n - 1] == '\r') n--;
1879 if (buf[n - 1] == '.') n--;
1880 buf[n] = '\0';
1881 }
1882 return n;
1883 }
1884
1885 if (errno != 0) {
1886 // C runtime error that has no corresponding DOS error code
1887 const char* s = strerror(errno);
1888 size_t n = strlen(s);
1889 if (n >= len) n = len - 1;
1890 strncpy(buf, s, n);
1891 buf[n] = '\0';
1892 return n;
1893 }
1894
1895 return 0;
1896 }
1897
1898 int os::get_last_error() {
1899 DWORD error = GetLastError();
1900 if (error == 0)
1901 error = errno;
1902 return (int)error;
1903 }
1904
1905 // sun.misc.Signal
1906 // NOTE that this is a workaround for an apparent kernel bug where if
1907 // a signal handler for SIGBREAK is installed then that signal handler
1908 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1909 // See bug 4416763.
1910 static void (*sigbreakHandler)(int) = NULL;
1911
1912 static void UserHandler(int sig, void *siginfo, void *context) {
1913 os::signal_notify(sig);
1914 // We need to reinstate the signal handler each time...
1915 os::signal(sig, (void*)UserHandler);
1916 }
1917
1918 void* os::user_handler() {
1919 return (void*) UserHandler;
1920 }
1921
1922 void* os::signal(int signal_number, void* handler) {
1923 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1924 void (*oldHandler)(int) = sigbreakHandler;
1925 sigbreakHandler = (void (*)(int)) handler;
1926 return (void*) oldHandler;
1927 } else {
1928 return (void*)::signal(signal_number, (void (*)(int))handler);
1929 }
1930 }
1931
1932 void os::signal_raise(int signal_number) {
1933 raise(signal_number);
1934 }
1935
1936 // The Win32 C runtime library maps all console control events other than ^C
1937 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1938 // logoff, and shutdown events. We therefore install our own console handler
1939 // that raises SIGTERM for the latter cases.
1940 //
1941 static BOOL WINAPI consoleHandler(DWORD event) {
1942 switch(event) {
1943 case CTRL_C_EVENT:
1944 if (is_error_reported()) {
1945 // Ctrl-C is pressed during error reporting, likely because the error
1946 // handler fails to abort. Let VM die immediately.
1947 os::die();
1948 }
1949
1950 os::signal_raise(SIGINT);
1951 return TRUE;
1952 break;
1953 case CTRL_BREAK_EVENT:
1954 if (sigbreakHandler != NULL) {
1955 (*sigbreakHandler)(SIGBREAK);
1956 }
1957 return TRUE;
1958 break;
1959 case CTRL_LOGOFF_EVENT: {
1960 // Don't terminate JVM if it is running in a non-interactive session,
1961 // such as a service process.
1962 USEROBJECTFLAGS flags;
1963 HANDLE handle = GetProcessWindowStation();
1964 if (handle != NULL &&
1965 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1966 sizeof( USEROBJECTFLAGS), NULL)) {
1967 // If it is a non-interactive session, let next handler to deal
1968 // with it.
1969 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1970 return FALSE;
1971 }
1972 }
1973 }
1974 case CTRL_CLOSE_EVENT:
1975 case CTRL_SHUTDOWN_EVENT:
1976 os::signal_raise(SIGTERM);
1977 return TRUE;
1978 break;
1979 default:
1980 break;
1981 }
1982 return FALSE;
1983 }
1984
1985 /*
1986 * The following code is moved from os.cpp for making this
1987 * code platform specific, which it is by its very nature.
1988 */
1989
1990 // Return maximum OS signal used + 1 for internal use only
1991 // Used as exit signal for signal_thread
1992 int os::sigexitnum_pd(){
1993 return NSIG;
1994 }
1995
1996 // a counter for each possible signal value, including signal_thread exit signal
1997 static volatile jint pending_signals[NSIG+1] = { 0 };
1998 static HANDLE sig_sem = NULL;
1999
2000 void os::signal_init_pd() {
2001 // Initialize signal structures
2002 memset((void*)pending_signals, 0, sizeof(pending_signals));
2003
2004 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2005
2006 // Programs embedding the VM do not want it to attempt to receive
2007 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2008 // shutdown hooks mechanism introduced in 1.3. For example, when
2009 // the VM is run as part of a Windows NT service (i.e., a servlet
2010 // engine in a web server), the correct behavior is for any console
2011 // control handler to return FALSE, not TRUE, because the OS's
2012 // "final" handler for such events allows the process to continue if
2013 // it is a service (while terminating it if it is not a service).
2014 // To make this behavior uniform and the mechanism simpler, we
2015 // completely disable the VM's usage of these console events if -Xrs
2016 // (=ReduceSignalUsage) is specified. This means, for example, that
2017 // the CTRL-BREAK thread dump mechanism is also disabled in this
2018 // case. See bugs 4323062, 4345157, and related bugs.
2019
2020 if (!ReduceSignalUsage) {
2021 // Add a CTRL-C handler
2022 SetConsoleCtrlHandler(consoleHandler, TRUE);
2023 }
2024 }
2025
2026 void os::signal_notify(int signal_number) {
2027 BOOL ret;
2028 if (sig_sem != NULL) {
2029 Atomic::inc(&pending_signals[signal_number]);
2030 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2031 assert(ret != 0, "ReleaseSemaphore() failed");
2032 }
2033 }
2034
2035 static int check_pending_signals(bool wait_for_signal) {
2036 DWORD ret;
2037 while (true) {
2038 for (int i = 0; i < NSIG + 1; i++) {
2039 jint n = pending_signals[i];
2040 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2041 return i;
2042 }
2043 }
2044 if (!wait_for_signal) {
2045 return -1;
2046 }
2047
2048 JavaThread *thread = JavaThread::current();
2049
2050 ThreadBlockInVM tbivm(thread);
2051
2052 bool threadIsSuspended;
2053 do {
2054 thread->set_suspend_equivalent();
2055 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2056 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2057 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2058
2059 // were we externally suspended while we were waiting?
2060 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2061 if (threadIsSuspended) {
2062 //
2063 // The semaphore has been incremented, but while we were waiting
2064 // another thread suspended us. We don't want to continue running
2065 // while suspended because that would surprise the thread that
2066 // suspended us.
2067 //
2068 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2069 assert(ret != 0, "ReleaseSemaphore() failed");
2070
2071 thread->java_suspend_self();
2072 }
2073 } while (threadIsSuspended);
2074 }
2075 }
2076
2077 int os::signal_lookup() {
2078 return check_pending_signals(false);
2079 }
2080
2081 int os::signal_wait() {
2082 return check_pending_signals(true);
2083 }
2084
2085 // Implicit OS exception handling
2086
2087 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2088 JavaThread* thread = JavaThread::current();
2089 // Save pc in thread
2090 #ifdef _M_IA64
2091 // Do not blow up if no thread info available.
2092 if (thread) {
2093 // Saving PRECISE pc (with slot information) in thread.
2094 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2095 // Convert precise PC into "Unix" format
2096 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2097 thread->set_saved_exception_pc((address)precise_pc);
2098 }
2099 // Set pc to handler
2100 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2101 // Clear out psr.ri (= Restart Instruction) in order to continue
2102 // at the beginning of the target bundle.
2103 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2104 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2105 #elif _M_AMD64
2106 // Do not blow up if no thread info available.
2107 if (thread) {
2108 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2109 }
2110 // Set pc to handler
2111 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2112 #else
2113 // Do not blow up if no thread info available.
2114 if (thread) {
2115 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2116 }
2117 // Set pc to handler
2118 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2119 #endif
2120
2121 // Continue the execution
2122 return EXCEPTION_CONTINUE_EXECUTION;
2123 }
2124
2125
2126 // Used for PostMortemDump
2127 extern "C" void safepoints();
2128 extern "C" void find(int x);
2129 extern "C" void events();
2130
2131 // According to Windows API documentation, an illegal instruction sequence should generate
2132 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2133 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2134 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2135
2136 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2137
2138 // From "Execution Protection in the Windows Operating System" draft 0.35
2139 // Once a system header becomes available, the "real" define should be
2140 // included or copied here.
2141 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2142
2143 // Handle NAT Bit consumption on IA64.
2144 #ifdef _M_IA64
2145 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2146 #endif
2147
2148 // Windows Vista/2008 heap corruption check
2149 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2150
2151 #define def_excpt(val) #val, val
2152
2153 struct siglabel {
2154 char *name;
2155 int number;
2156 };
2157
2158 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2159 // C++ compiler contain this error code. Because this is a compiler-generated
2160 // error, the code is not listed in the Win32 API header files.
2161 // The code is actually a cryptic mnemonic device, with the initial "E"
2162 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2163 // ASCII values of "msc".
2164
2165 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2166
2167
2168 struct siglabel exceptlabels[] = {
2169 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2170 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2171 def_excpt(EXCEPTION_BREAKPOINT),
2172 def_excpt(EXCEPTION_SINGLE_STEP),
2173 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2174 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2175 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2176 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2177 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2178 def_excpt(EXCEPTION_FLT_OVERFLOW),
2179 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2180 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2181 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2182 def_excpt(EXCEPTION_INT_OVERFLOW),
2183 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2184 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2185 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2186 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2187 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2188 def_excpt(EXCEPTION_STACK_OVERFLOW),
2189 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2190 def_excpt(EXCEPTION_GUARD_PAGE),
2191 def_excpt(EXCEPTION_INVALID_HANDLE),
2192 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2193 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2194 #ifdef _M_IA64
2195 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2196 #endif
2197 NULL, 0
2198 };
2199
2200 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2201 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2202 if (exceptlabels[i].number == exception_code) {
2203 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2204 return buf;
2205 }
2206 }
2207
2208 return NULL;
2209 }
2210
2211 //-----------------------------------------------------------------------------
2212 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2213 // handle exception caused by idiv; should only happen for -MinInt/-1
2214 // (division by zero is handled explicitly)
2215 #ifdef _M_IA64
2216 assert(0, "Fix Handle_IDiv_Exception");
2217 #elif _M_AMD64
2218 PCONTEXT ctx = exceptionInfo->ContextRecord;
2219 address pc = (address)ctx->Rip;
2220 assert(pc[0] == 0xF7, "not an idiv opcode");
2221 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2222 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2223 // set correct result values and continue after idiv instruction
2224 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2225 ctx->Rax = (DWORD)min_jint; // result
2226 ctx->Rdx = (DWORD)0; // remainder
2227 // Continue the execution
2228 #else
2229 PCONTEXT ctx = exceptionInfo->ContextRecord;
2230 address pc = (address)ctx->Eip;
2231 assert(pc[0] == 0xF7, "not an idiv opcode");
2232 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2233 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2234 // set correct result values and continue after idiv instruction
2235 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2236 ctx->Eax = (DWORD)min_jint; // result
2237 ctx->Edx = (DWORD)0; // remainder
2238 // Continue the execution
2239 #endif
2240 return EXCEPTION_CONTINUE_EXECUTION;
2241 }
2242
2243 #ifndef _WIN64
2244 //-----------------------------------------------------------------------------
2245 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2246 // handle exception caused by native method modifying control word
2247 PCONTEXT ctx = exceptionInfo->ContextRecord;
2248 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2249
2250 switch (exception_code) {
2251 case EXCEPTION_FLT_DENORMAL_OPERAND:
2252 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2253 case EXCEPTION_FLT_INEXACT_RESULT:
2254 case EXCEPTION_FLT_INVALID_OPERATION:
2255 case EXCEPTION_FLT_OVERFLOW:
2256 case EXCEPTION_FLT_STACK_CHECK:
2257 case EXCEPTION_FLT_UNDERFLOW:
2258 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2259 if (fp_control_word != ctx->FloatSave.ControlWord) {
2260 // Restore FPCW and mask out FLT exceptions
2261 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2262 // Mask out pending FLT exceptions
2263 ctx->FloatSave.StatusWord &= 0xffffff00;
2264 return EXCEPTION_CONTINUE_EXECUTION;
2265 }
2266 }
2267
2268 if (prev_uef_handler != NULL) {
2269 // We didn't handle this exception so pass it to the previous
2270 // UnhandledExceptionFilter.
2271 return (prev_uef_handler)(exceptionInfo);
2272 }
2273
2274 return EXCEPTION_CONTINUE_SEARCH;
2275 }
2276 #else //_WIN64
2277 /*
2278 On Windows, the mxcsr control bits are non-volatile across calls
2279 See also CR 6192333
2280 If EXCEPTION_FLT_* happened after some native method modified
2281 mxcsr - it is not a jvm fault.
2282 However should we decide to restore of mxcsr after a faulty
2283 native method we can uncomment following code
2284 jint MxCsr = INITIAL_MXCSR;
2285 // we can't use StubRoutines::addr_mxcsr_std()
2286 // because in Win64 mxcsr is not saved there
2287 if (MxCsr != ctx->MxCsr) {
2288 ctx->MxCsr = MxCsr;
2289 return EXCEPTION_CONTINUE_EXECUTION;
2290 }
2291
2292 */
2293 #endif //_WIN64
2294
2295
2296 // Fatal error reporting is single threaded so we can make this a
2297 // static and preallocated. If it's more than MAX_PATH silently ignore
2298 // it.
2299 static char saved_error_file[MAX_PATH] = {0};
2300
2301 void os::set_error_file(const char *logfile) {
2302 if (strlen(logfile) <= MAX_PATH) {
2303 strncpy(saved_error_file, logfile, MAX_PATH);
2304 }
2305 }
2306
2307 static inline void report_error(Thread* t, DWORD exception_code,
2308 address addr, void* siginfo, void* context) {
2309 VMError err(t, exception_code, addr, siginfo, context);
2310 err.report_and_die();
2311
2312 // If UseOsErrorReporting, this will return here and save the error file
2313 // somewhere where we can find it in the minidump.
2314 }
2315
2316 //-----------------------------------------------------------------------------
2317 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2318 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2319 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2320 #ifdef _M_IA64
2321 // On Itanium, we need the "precise pc", which has the slot number coded
2322 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2323 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2324 // Convert the pc to "Unix format", which has the slot number coded
2325 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2326 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2327 // information is saved in the Unix format.
2328 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2329 #elif _M_AMD64
2330 address pc = (address) exceptionInfo->ContextRecord->Rip;
2331 #else
2332 address pc = (address) exceptionInfo->ContextRecord->Eip;
2333 #endif
2334 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2335
2336 // Handle SafeFetch32 and SafeFetchN exceptions.
2337 if (StubRoutines::is_safefetch_fault(pc)) {
2338 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2339 }
2340
2341 #ifndef _WIN64
2342 // Execution protection violation - win32 running on AMD64 only
2343 // Handled first to avoid misdiagnosis as a "normal" access violation;
2344 // This is safe to do because we have a new/unique ExceptionInformation
2345 // code for this condition.
2346 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2347 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2348 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2349 address addr = (address) exceptionRecord->ExceptionInformation[1];
2350
2351 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2352 int page_size = os::vm_page_size();
2353
2354 // Make sure the pc and the faulting address are sane.
2355 //
2356 // If an instruction spans a page boundary, and the page containing
2357 // the beginning of the instruction is executable but the following
2358 // page is not, the pc and the faulting address might be slightly
2359 // different - we still want to unguard the 2nd page in this case.
2360 //
2361 // 15 bytes seems to be a (very) safe value for max instruction size.
2362 bool pc_is_near_addr =
2363 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2364 bool instr_spans_page_boundary =
2365 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2366 (intptr_t) page_size) > 0);
2367
2368 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2369 static volatile address last_addr =
2370 (address) os::non_memory_address_word();
2371
2372 // In conservative mode, don't unguard unless the address is in the VM
2373 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2374 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2375
2376 // Set memory to RWX and retry
2377 address page_start =
2378 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2379 bool res = os::protect_memory((char*) page_start, page_size,
2380 os::MEM_PROT_RWX);
2381
2382 if (PrintMiscellaneous && Verbose) {
2383 char buf[256];
2384 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2385 "at " INTPTR_FORMAT
2386 ", unguarding " INTPTR_FORMAT ": %s", addr,
2387 page_start, (res ? "success" : strerror(errno)));
2388 tty->print_raw_cr(buf);
2389 }
2390
2391 // Set last_addr so if we fault again at the same address, we don't
2392 // end up in an endless loop.
2393 //
2394 // There are two potential complications here. Two threads trapping
2395 // at the same address at the same time could cause one of the
2396 // threads to think it already unguarded, and abort the VM. Likely
2397 // very rare.
2398 //
2399 // The other race involves two threads alternately trapping at
2400 // different addresses and failing to unguard the page, resulting in
2401 // an endless loop. This condition is probably even more unlikely
2402 // than the first.
2403 //
2404 // Although both cases could be avoided by using locks or thread
2405 // local last_addr, these solutions are unnecessary complication:
2406 // this handler is a best-effort safety net, not a complete solution.
2407 // It is disabled by default and should only be used as a workaround
2408 // in case we missed any no-execute-unsafe VM code.
2409
2410 last_addr = addr;
2411
2412 return EXCEPTION_CONTINUE_EXECUTION;
2413 }
2414 }
2415
2416 // Last unguard failed or not unguarding
2417 tty->print_raw_cr("Execution protection violation");
2418 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2419 exceptionInfo->ContextRecord);
2420 return EXCEPTION_CONTINUE_SEARCH;
2421 }
2422 }
2423 #endif // _WIN64
2424
2425 // Check to see if we caught the safepoint code in the
2426 // process of write protecting the memory serialization page.
2427 // It write enables the page immediately after protecting it
2428 // so just return.
2429 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2430 JavaThread* thread = (JavaThread*) t;
2431 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2432 address addr = (address) exceptionRecord->ExceptionInformation[1];
2433 if ( os::is_memory_serialize_page(thread, addr) ) {
2434 // Block current thread until the memory serialize page permission restored.
2435 os::block_on_serialize_page_trap();
2436 return EXCEPTION_CONTINUE_EXECUTION;
2437 }
2438 }
2439
2440 if (t != NULL && t->is_Java_thread()) {
2441 JavaThread* thread = (JavaThread*) t;
2442 bool in_java = thread->thread_state() == _thread_in_Java;
2443
2444 // Handle potential stack overflows up front.
2445 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2446 if (os::uses_stack_guard_pages()) {
2447 #ifdef _M_IA64
2448 // Use guard page for register stack.
2449 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2450 address addr = (address) exceptionRecord->ExceptionInformation[1];
2451 // Check for a register stack overflow on Itanium
2452 if (thread->addr_inside_register_stack_red_zone(addr)) {
2453 // Fatal red zone violation happens if the Java program
2454 // catches a StackOverflow error and does so much processing
2455 // that it runs beyond the unprotected yellow guard zone. As
2456 // a result, we are out of here.
2457 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2458 } else if(thread->addr_inside_register_stack(addr)) {
2459 // Disable the yellow zone which sets the state that
2460 // we've got a stack overflow problem.
2461 if (thread->stack_yellow_zone_enabled()) {
2462 thread->disable_stack_yellow_zone();
2463 }
2464 // Give us some room to process the exception.
2465 thread->disable_register_stack_guard();
2466 // Tracing with +Verbose.
2467 if (Verbose) {
2468 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2469 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2470 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2471 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2472 thread->register_stack_base(),
2473 thread->register_stack_base() + thread->stack_size());
2474 }
2475
2476 // Reguard the permanent register stack red zone just to be sure.
2477 // We saw Windows silently disabling this without telling us.
2478 thread->enable_register_stack_red_zone();
2479
2480 return Handle_Exception(exceptionInfo,
2481 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2482 }
2483 #endif
2484 if (thread->stack_yellow_zone_enabled()) {
2485 // Yellow zone violation. The o/s has unprotected the first yellow
2486 // zone page for us. Note: must call disable_stack_yellow_zone to
2487 // update the enabled status, even if the zone contains only one page.
2488 thread->disable_stack_yellow_zone();
2489 // If not in java code, return and hope for the best.
2490 return in_java ? Handle_Exception(exceptionInfo,
2491 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2492 : EXCEPTION_CONTINUE_EXECUTION;
2493 } else {
2494 // Fatal red zone violation.
2495 thread->disable_stack_red_zone();
2496 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2497 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2498 exceptionInfo->ContextRecord);
2499 return EXCEPTION_CONTINUE_SEARCH;
2500 }
2501 } else if (in_java) {
2502 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2503 // a one-time-only guard page, which it has released to us. The next
2504 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2505 return Handle_Exception(exceptionInfo,
2506 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2507 } else {
2508 // Can only return and hope for the best. Further stack growth will
2509 // result in an ACCESS_VIOLATION.
2510 return EXCEPTION_CONTINUE_EXECUTION;
2511 }
2512 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2513 // Either stack overflow or null pointer exception.
2514 if (in_java) {
2515 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2516 address addr = (address) exceptionRecord->ExceptionInformation[1];
2517 address stack_end = thread->stack_base() - thread->stack_size();
2518 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2519 // Stack overflow.
2520 assert(!os::uses_stack_guard_pages(),
2521 "should be caught by red zone code above.");
2522 return Handle_Exception(exceptionInfo,
2523 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2524 }
2525 //
2526 // Check for safepoint polling and implicit null
2527 // We only expect null pointers in the stubs (vtable)
2528 // the rest are checked explicitly now.
2529 //
2530 CodeBlob* cb = CodeCache::find_blob(pc);
2531 if (cb != NULL) {
2532 if (os::is_poll_address(addr)) {
2533 address stub = SharedRuntime::get_poll_stub(pc);
2534 return Handle_Exception(exceptionInfo, stub);
2535 }
2536 }
2537 {
2538 #ifdef _WIN64
2539 //
2540 // If it's a legal stack address map the entire region in
2541 //
2542 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2543 address addr = (address) exceptionRecord->ExceptionInformation[1];
2544 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2545 addr = (address)((uintptr_t)addr &
2546 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2547 os::commit_memory((char *)addr, thread->stack_base() - addr,
2548 !ExecMem);
2549 return EXCEPTION_CONTINUE_EXECUTION;
2550 }
2551 else
2552 #endif
2553 {
2554 // Null pointer exception.
2555 #ifdef _M_IA64
2556 // Process implicit null checks in compiled code. Note: Implicit null checks
2557 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2558 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2559 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2560 // Handle implicit null check in UEP method entry
2561 if (cb && (cb->is_frame_complete_at(pc) ||
2562 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2563 if (Verbose) {
2564 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2565 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2566 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2567 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2568 *(bundle_start + 1), *bundle_start);
2569 }
2570 return Handle_Exception(exceptionInfo,
2571 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2572 }
2573 }
2574
2575 // Implicit null checks were processed above. Hence, we should not reach
2576 // here in the usual case => die!
2577 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2578 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2579 exceptionInfo->ContextRecord);
2580 return EXCEPTION_CONTINUE_SEARCH;
2581
2582 #else // !IA64
2583
2584 // Windows 98 reports faulting addresses incorrectly
2585 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2586 !os::win32::is_nt()) {
2587 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2588 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2589 }
2590 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2591 exceptionInfo->ContextRecord);
2592 return EXCEPTION_CONTINUE_SEARCH;
2593 #endif
2594 }
2595 }
2596 }
2597
2598 #ifdef _WIN64
2599 // Special care for fast JNI field accessors.
2600 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2601 // in and the heap gets shrunk before the field access.
2602 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2603 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2604 if (addr != (address)-1) {
2605 return Handle_Exception(exceptionInfo, addr);
2606 }
2607 }
2608 #endif
2609
2610 // Stack overflow or null pointer exception in native code.
2611 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2612 exceptionInfo->ContextRecord);
2613 return EXCEPTION_CONTINUE_SEARCH;
2614 } // /EXCEPTION_ACCESS_VIOLATION
2615 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2616 #if defined _M_IA64
2617 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2618 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2619 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2620
2621 // Compiled method patched to be non entrant? Following conditions must apply:
2622 // 1. must be first instruction in bundle
2623 // 2. must be a break instruction with appropriate code
2624 if((((uint64_t) pc & 0x0F) == 0) &&
2625 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2626 return Handle_Exception(exceptionInfo,
2627 (address)SharedRuntime::get_handle_wrong_method_stub());
2628 }
2629 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2630 #endif
2631
2632
2633 if (in_java) {
2634 switch (exception_code) {
2635 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2636 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2637
2638 case EXCEPTION_INT_OVERFLOW:
2639 return Handle_IDiv_Exception(exceptionInfo);
2640
2641 } // switch
2642 }
2643 #ifndef _WIN64
2644 if (((thread->thread_state() == _thread_in_Java) ||
2645 (thread->thread_state() == _thread_in_native)) &&
2646 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2647 {
2648 LONG result=Handle_FLT_Exception(exceptionInfo);
2649 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2650 }
2651 #endif //_WIN64
2652 }
2653
2654 if (exception_code != EXCEPTION_BREAKPOINT) {
2655 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2656 exceptionInfo->ContextRecord);
2657 }
2658 return EXCEPTION_CONTINUE_SEARCH;
2659 }
2660
2661 #ifndef _WIN64
2662 // Special care for fast JNI accessors.
2663 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2664 // the heap gets shrunk before the field access.
2665 // Need to install our own structured exception handler since native code may
2666 // install its own.
2667 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2668 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2669 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2670 address pc = (address) exceptionInfo->ContextRecord->Eip;
2671 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2672 if (addr != (address)-1) {
2673 return Handle_Exception(exceptionInfo, addr);
2674 }
2675 }
2676 return EXCEPTION_CONTINUE_SEARCH;
2677 }
2678
2679 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2680 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2681 __try { \
2682 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2683 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2684 } \
2685 return 0; \
2686 }
2687
2688 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2689 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2690 DEFINE_FAST_GETFIELD(jchar, char, Char)
2691 DEFINE_FAST_GETFIELD(jshort, short, Short)
2692 DEFINE_FAST_GETFIELD(jint, int, Int)
2693 DEFINE_FAST_GETFIELD(jlong, long, Long)
2694 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2695 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2696
2697 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2698 switch (type) {
2699 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2700 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2701 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2702 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2703 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2704 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2705 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2706 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2707 default: ShouldNotReachHere();
2708 }
2709 return (address)-1;
2710 }
2711 #endif
2712
2713 #ifndef PRODUCT
2714 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2715 // Install a win32 structured exception handler around the test
2716 // function call so the VM can generate an error dump if needed.
2717 __try {
2718 (*funcPtr)();
2719 } __except(topLevelExceptionFilter(
2720 (_EXCEPTION_POINTERS*)_exception_info())) {
2721 // Nothing to do.
2722 }
2723 }
2724 #endif
2725
2726 // Virtual Memory
2727
2728 int os::vm_page_size() { return os::win32::vm_page_size(); }
2729 int os::vm_allocation_granularity() {
2730 return os::win32::vm_allocation_granularity();
2731 }
2732
2733 // Windows large page support is available on Windows 2003. In order to use
2734 // large page memory, the administrator must first assign additional privilege
2735 // to the user:
2736 // + select Control Panel -> Administrative Tools -> Local Security Policy
2737 // + select Local Policies -> User Rights Assignment
2738 // + double click "Lock pages in memory", add users and/or groups
2739 // + reboot
2740 // Note the above steps are needed for administrator as well, as administrators
2741 // by default do not have the privilege to lock pages in memory.
2742 //
2743 // Note about Windows 2003: although the API supports committing large page
2744 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2745 // scenario, I found through experiment it only uses large page if the entire
2746 // memory region is reserved and committed in a single VirtualAlloc() call.
2747 // This makes Windows large page support more or less like Solaris ISM, in
2748 // that the entire heap must be committed upfront. This probably will change
2749 // in the future, if so the code below needs to be revisited.
2750
2751 #ifndef MEM_LARGE_PAGES
2752 #define MEM_LARGE_PAGES 0x20000000
2753 #endif
2754
2755 static HANDLE _hProcess;
2756 static HANDLE _hToken;
2757
2758 // Container for NUMA node list info
2759 class NUMANodeListHolder {
2760 private:
2761 int *_numa_used_node_list; // allocated below
2762 int _numa_used_node_count;
2763
2764 void free_node_list() {
2765 if (_numa_used_node_list != NULL) {
2766 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2767 }
2768 }
2769
2770 public:
2771 NUMANodeListHolder() {
2772 _numa_used_node_count = 0;
2773 _numa_used_node_list = NULL;
2774 // do rest of initialization in build routine (after function pointers are set up)
2775 }
2776
2777 ~NUMANodeListHolder() {
2778 free_node_list();
2779 }
2780
2781 bool build() {
2782 DWORD_PTR proc_aff_mask;
2783 DWORD_PTR sys_aff_mask;
2784 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2785 ULONG highest_node_number;
2786 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2787 free_node_list();
2788 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2789 for (unsigned int i = 0; i <= highest_node_number; i++) {
2790 ULONGLONG proc_mask_numa_node;
2791 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2792 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2793 _numa_used_node_list[_numa_used_node_count++] = i;
2794 }
2795 }
2796 return (_numa_used_node_count > 1);
2797 }
2798
2799 int get_count() {return _numa_used_node_count;}
2800 int get_node_list_entry(int n) {
2801 // for indexes out of range, returns -1
2802 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2803 }
2804
2805 } numa_node_list_holder;
2806
2807
2808
2809 static size_t _large_page_size = 0;
2810
2811 static bool resolve_functions_for_large_page_init() {
2812 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2813 os::Advapi32Dll::AdvapiAvailable();
2814 }
2815
2816 static bool request_lock_memory_privilege() {
2817 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2818 os::current_process_id());
2819
2820 LUID luid;
2821 if (_hProcess != NULL &&
2822 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2823 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2824
2825 TOKEN_PRIVILEGES tp;
2826 tp.PrivilegeCount = 1;
2827 tp.Privileges[0].Luid = luid;
2828 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2829
2830 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2831 // privilege. Check GetLastError() too. See MSDN document.
2832 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2833 (GetLastError() == ERROR_SUCCESS)) {
2834 return true;
2835 }
2836 }
2837
2838 return false;
2839 }
2840
2841 static void cleanup_after_large_page_init() {
2842 if (_hProcess) CloseHandle(_hProcess);
2843 _hProcess = NULL;
2844 if (_hToken) CloseHandle(_hToken);
2845 _hToken = NULL;
2846 }
2847
2848 static bool numa_interleaving_init() {
2849 bool success = false;
2850 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2851
2852 // print a warning if UseNUMAInterleaving flag is specified on command line
2853 bool warn_on_failure = use_numa_interleaving_specified;
2854 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2855
2856 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2857 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2858 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2859
2860 if (os::Kernel32Dll::NumaCallsAvailable()) {
2861 if (numa_node_list_holder.build()) {
2862 if (PrintMiscellaneous && Verbose) {
2863 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2864 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2865 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2866 }
2867 tty->print("\n");
2868 }
2869 success = true;
2870 } else {
2871 WARN("Process does not cover multiple NUMA nodes.");
2872 }
2873 } else {
2874 WARN("NUMA Interleaving is not supported by the operating system.");
2875 }
2876 if (!success) {
2877 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2878 }
2879 return success;
2880 #undef WARN
2881 }
2882
2883 // this routine is used whenever we need to reserve a contiguous VA range
2884 // but we need to make separate VirtualAlloc calls for each piece of the range
2885 // Reasons for doing this:
2886 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2887 // * UseNUMAInterleaving requires a separate node for each piece
2888 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2889 bool should_inject_error=false) {
2890 char * p_buf;
2891 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2892 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2893 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2894
2895 // first reserve enough address space in advance since we want to be
2896 // able to break a single contiguous virtual address range into multiple
2897 // large page commits but WS2003 does not allow reserving large page space
2898 // so we just use 4K pages for reserve, this gives us a legal contiguous
2899 // address space. then we will deallocate that reservation, and re alloc
2900 // using large pages
2901 const size_t size_of_reserve = bytes + chunk_size;
2902 if (bytes > size_of_reserve) {
2903 // Overflowed.
2904 return NULL;
2905 }
2906 p_buf = (char *) VirtualAlloc(addr,
2907 size_of_reserve, // size of Reserve
2908 MEM_RESERVE,
2909 PAGE_READWRITE);
2910 // If reservation failed, return NULL
2911 if (p_buf == NULL) return NULL;
2912 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
2913 os::release_memory(p_buf, bytes + chunk_size);
2914
2915 // we still need to round up to a page boundary (in case we are using large pages)
2916 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2917 // instead we handle this in the bytes_to_rq computation below
2918 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2919
2920 // now go through and allocate one chunk at a time until all bytes are
2921 // allocated
2922 size_t bytes_remaining = bytes;
2923 // An overflow of align_size_up() would have been caught above
2924 // in the calculation of size_of_reserve.
2925 char * next_alloc_addr = p_buf;
2926 HANDLE hProc = GetCurrentProcess();
2927
2928 #ifdef ASSERT
2929 // Variable for the failure injection
2930 long ran_num = os::random();
2931 size_t fail_after = ran_num % bytes;
2932 #endif
2933
2934 int count=0;
2935 while (bytes_remaining) {
2936 // select bytes_to_rq to get to the next chunk_size boundary
2937
2938 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2939 // Note allocate and commit
2940 char * p_new;
2941
2942 #ifdef ASSERT
2943 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2944 #else
2945 const bool inject_error_now = false;
2946 #endif
2947
2948 if (inject_error_now) {
2949 p_new = NULL;
2950 } else {
2951 if (!UseNUMAInterleaving) {
2952 p_new = (char *) VirtualAlloc(next_alloc_addr,
2953 bytes_to_rq,
2954 flags,
2955 prot);
2956 } else {
2957 // get the next node to use from the used_node_list
2958 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2959 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2960 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2961 next_alloc_addr,
2962 bytes_to_rq,
2963 flags,
2964 prot,
2965 node);
2966 }
2967 }
2968
2969 if (p_new == NULL) {
2970 // Free any allocated pages
2971 if (next_alloc_addr > p_buf) {
2972 // Some memory was committed so release it.
2973 size_t bytes_to_release = bytes - bytes_remaining;
2974 // NMT has yet to record any individual blocks, so it
2975 // need to create a dummy 'reserve' record to match
2976 // the release.
2977 MemTracker::record_virtual_memory_reserve((address)p_buf,
2978 bytes_to_release, mtNone, CALLER_PC);
2979 os::release_memory(p_buf, bytes_to_release);
2980 }
2981 #ifdef ASSERT
2982 if (should_inject_error) {
2983 if (TracePageSizes && Verbose) {
2984 tty->print_cr("Reserving pages individually failed.");
2985 }
2986 }
2987 #endif
2988 return NULL;
2989 }
2990
2991 bytes_remaining -= bytes_to_rq;
2992 next_alloc_addr += bytes_to_rq;
2993 count++;
2994 }
2995 // Although the memory is allocated individually, it is returned as one.
2996 // NMT records it as one block.
2997 address pc = CALLER_PC;
2998 if ((flags & MEM_COMMIT) != 0) {
2999 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
3000 } else {
3001 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
3002 }
3003
3004 // made it this far, success
3005 return p_buf;
3006 }
3007
3008
3009
3010 void os::large_page_init() {
3011 if (!UseLargePages) return;
3012
3013 // print a warning if any large page related flag is specified on command line
3014 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3015 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3016 bool success = false;
3017
3018 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3019 if (resolve_functions_for_large_page_init()) {
3020 if (request_lock_memory_privilege()) {
3021 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3022 if (s) {
3023 #if defined(IA32) || defined(AMD64)
3024 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3025 WARN("JVM cannot use large pages bigger than 4mb.");
3026 } else {
3027 #endif
3028 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3029 _large_page_size = LargePageSizeInBytes;
3030 } else {
3031 _large_page_size = s;
3032 }
3033 success = true;
3034 #if defined(IA32) || defined(AMD64)
3035 }
3036 #endif
3037 } else {
3038 WARN("Large page is not supported by the processor.");
3039 }
3040 } else {
3041 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3042 }
3043 } else {
3044 WARN("Large page is not supported by the operating system.");
3045 }
3046 #undef WARN
3047
3048 const size_t default_page_size = (size_t) vm_page_size();
3049 if (success && _large_page_size > default_page_size) {
3050 _page_sizes[0] = _large_page_size;
3051 _page_sizes[1] = default_page_size;
3052 _page_sizes[2] = 0;
3053 }
3054
3055 cleanup_after_large_page_init();
3056 UseLargePages = success;
3057 }
3058
3059 // On win32, one cannot release just a part of reserved memory, it's an
3060 // all or nothing deal. When we split a reservation, we must break the
3061 // reservation into two reservations.
3062 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3063 bool realloc) {
3064 if (size > 0) {
3065 release_memory(base, size);
3066 if (realloc) {
3067 reserve_memory(split, base);
3068 }
3069 if (size != split) {
3070 reserve_memory(size - split, base + split);
3071 }
3072 }
3073 }
3074
3075 // Multiple threads can race in this code but it's not possible to unmap small sections of
3076 // virtual space to get requested alignment, like posix-like os's.
3077 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3078 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3079 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3080 "Alignment must be a multiple of allocation granularity (page size)");
3081 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3082
3083 size_t extra_size = size + alignment;
3084 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3085
3086 char* aligned_base = NULL;
3087
3088 do {
3089 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3090 if (extra_base == NULL) {
3091 return NULL;
3092 }
3093 // Do manual alignment
3094 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3095
3096 os::release_memory(extra_base, extra_size);
3097
3098 aligned_base = os::reserve_memory(size, aligned_base);
3099
3100 } while (aligned_base == NULL);
3101
3102 return aligned_base;
3103 }
3104
3105 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3106 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3107 "reserve alignment");
3108 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3109 char* res;
3110 // note that if UseLargePages is on, all the areas that require interleaving
3111 // will go thru reserve_memory_special rather than thru here.
3112 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3113 if (!use_individual) {
3114 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3115 } else {
3116 elapsedTimer reserveTimer;
3117 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3118 // in numa interleaving, we have to allocate pages individually
3119 // (well really chunks of NUMAInterleaveGranularity size)
3120 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3121 if (res == NULL) {
3122 warning("NUMA page allocation failed");
3123 }
3124 if( Verbose && PrintMiscellaneous ) {
3125 reserveTimer.stop();
3126 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3127 reserveTimer.milliseconds(), reserveTimer.ticks());
3128 }
3129 }
3130 assert(res == NULL || addr == NULL || addr == res,
3131 "Unexpected address from reserve.");
3132
3133 return res;
3134 }
3135
3136 // Reserve memory at an arbitrary address, only if that area is
3137 // available (and not reserved for something else).
3138 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3139 // Windows os::reserve_memory() fails of the requested address range is
3140 // not avilable.
3141 return reserve_memory(bytes, requested_addr);
3142 }
3143
3144 size_t os::large_page_size() {
3145 return _large_page_size;
3146 }
3147
3148 bool os::can_commit_large_page_memory() {
3149 // Windows only uses large page memory when the entire region is reserved
3150 // and committed in a single VirtualAlloc() call. This may change in the
3151 // future, but with Windows 2003 it's not possible to commit on demand.
3152 return false;
3153 }
3154
3155 bool os::can_execute_large_page_memory() {
3156 return true;
3157 }
3158
3159 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3160 assert(UseLargePages, "only for large pages");
3161
3162 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3163 return NULL; // Fallback to small pages.
3164 }
3165
3166 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3167 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3168
3169 // with large pages, there are two cases where we need to use Individual Allocation
3170 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3171 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3172 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3173 if (TracePageSizes && Verbose) {
3174 tty->print_cr("Reserving large pages individually.");
3175 }
3176 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3177 if (p_buf == NULL) {
3178 // give an appropriate warning message
3179 if (UseNUMAInterleaving) {
3180 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3181 }
3182 if (UseLargePagesIndividualAllocation) {
3183 warning("Individually allocated large pages failed, "
3184 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3185 }
3186 return NULL;
3187 }
3188
3189 return p_buf;
3190
3191 } else {
3192 if (TracePageSizes && Verbose) {
3193 tty->print_cr("Reserving large pages in a single large chunk.");
3194 }
3195 // normal policy just allocate it all at once
3196 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3197 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3198 if (res != NULL) {
3199 address pc = CALLER_PC;
3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
3201 }
3202
3203 return res;
3204 }
3205 }
3206
3207 bool os::release_memory_special(char* base, size_t bytes) {
3208 assert(base != NULL, "Sanity check");
3209 return release_memory(base, bytes);
3210 }
3211
3212 void os::print_statistics() {
3213 }
3214
3215 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3216 int err = os::get_last_error();
3217 char buf[256];
3218 size_t buf_len = os::lasterror(buf, sizeof(buf));
3219 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3220 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3221 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3222 }
3223
3224 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3225 if (bytes == 0) {
3226 // Don't bother the OS with noops.
3227 return true;
3228 }
3229 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3230 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3231 // Don't attempt to print anything if the OS call fails. We're
3232 // probably low on resources, so the print itself may cause crashes.
3233
3234 // unless we have NUMAInterleaving enabled, the range of a commit
3235 // is always within a reserve covered by a single VirtualAlloc
3236 // in that case we can just do a single commit for the requested size
3237 if (!UseNUMAInterleaving) {
3238 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3239 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3240 return false;
3241 }
3242 if (exec) {
3243 DWORD oldprot;
3244 // Windows doc says to use VirtualProtect to get execute permissions
3245 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3246 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3247 return false;
3248 }
3249 }
3250 return true;
3251 } else {
3252
3253 // when NUMAInterleaving is enabled, the commit might cover a range that
3254 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3255 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3256 // returns represents the number of bytes that can be committed in one step.
3257 size_t bytes_remaining = bytes;
3258 char * next_alloc_addr = addr;
3259 while (bytes_remaining > 0) {
3260 MEMORY_BASIC_INFORMATION alloc_info;
3261 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3262 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3263 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3264 PAGE_READWRITE) == NULL) {
3265 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3266 exec);)
3267 return false;
3268 }
3269 if (exec) {
3270 DWORD oldprot;
3271 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3272 PAGE_EXECUTE_READWRITE, &oldprot)) {
3273 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3274 exec);)
3275 return false;
3276 }
3277 }
3278 bytes_remaining -= bytes_to_rq;
3279 next_alloc_addr += bytes_to_rq;
3280 }
3281 }
3282 // if we made it this far, return true
3283 return true;
3284 }
3285
3286 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3287 bool exec) {
3288 // alignment_hint is ignored on this OS
3289 return pd_commit_memory(addr, size, exec);
3290 }
3291
3292 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3293 const char* mesg) {
3294 assert(mesg != NULL, "mesg must be specified");
3295 if (!pd_commit_memory(addr, size, exec)) {
3296 warn_fail_commit_memory(addr, size, exec);
3297 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3298 }
3299 }
3300
3301 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3302 size_t alignment_hint, bool exec,
3303 const char* mesg) {
3304 // alignment_hint is ignored on this OS
3305 pd_commit_memory_or_exit(addr, size, exec, mesg);
3306 }
3307
3308 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3309 if (bytes == 0) {
3310 // Don't bother the OS with noops.
3311 return true;
3312 }
3313 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3314 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3315 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3316 }
3317
3318 bool os::pd_release_memory(char* addr, size_t bytes) {
3319 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3320 }
3321
3322 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3323 return os::commit_memory(addr, size, !ExecMem);
3324 }
3325
3326 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3327 return os::uncommit_memory(addr, size);
3328 }
3329
3330 // Set protections specified
3331 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3332 bool is_committed) {
3333 unsigned int p = 0;
3334 switch (prot) {
3335 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3336 case MEM_PROT_READ: p = PAGE_READONLY; break;
3337 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3338 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3339 default:
3340 ShouldNotReachHere();
3341 }
3342
3343 DWORD old_status;
3344
3345 // Strange enough, but on Win32 one can change protection only for committed
3346 // memory, not a big deal anyway, as bytes less or equal than 64K
3347 if (!is_committed) {
3348 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3349 "cannot commit protection page");
3350 }
3351 // One cannot use os::guard_memory() here, as on Win32 guard page
3352 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3353 //
3354 // Pages in the region become guard pages. Any attempt to access a guard page
3355 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3356 // the guard page status. Guard pages thus act as a one-time access alarm.
3357 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3358 }
3359
3360 bool os::guard_memory(char* addr, size_t bytes) {
3361 DWORD old_status;
3362 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3363 }
3364
3365 bool os::unguard_memory(char* addr, size_t bytes) {
3366 DWORD old_status;
3367 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3368 }
3369
3370 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3371 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3372 void os::numa_make_global(char *addr, size_t bytes) { }
3373 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3374 bool os::numa_topology_changed() { return false; }
3375 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3376 int os::numa_get_group_id() { return 0; }
3377 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3378 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3379 // Provide an answer for UMA systems
3380 ids[0] = 0;
3381 return 1;
3382 } else {
3383 // check for size bigger than actual groups_num
3384 size = MIN2(size, numa_get_groups_num());
3385 for (int i = 0; i < (int)size; i++) {
3386 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3387 }
3388 return size;
3389 }
3390 }
3391
3392 bool os::get_page_info(char *start, page_info* info) {
3393 return false;
3394 }
3395
3396 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3397 return end;
3398 }
3399
3400 char* os::non_memory_address_word() {
3401 // Must never look like an address returned by reserve_memory,
3402 // even in its subfields (as defined by the CPU immediate fields,
3403 // if the CPU splits constants across multiple instructions).
3404 return (char*)-1;
3405 }
3406
3407 #define MAX_ERROR_COUNT 100
3408 #define SYS_THREAD_ERROR 0xffffffffUL
3409
3410 void os::pd_start_thread(Thread* thread) {
3411 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3412 // Returns previous suspend state:
3413 // 0: Thread was not suspended
3414 // 1: Thread is running now
3415 // >1: Thread is still suspended.
3416 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3417 }
3418
3419 class HighResolutionInterval : public CHeapObj<mtThread> {
3420 // The default timer resolution seems to be 10 milliseconds.
3421 // (Where is this written down?)
3422 // If someone wants to sleep for only a fraction of the default,
3423 // then we set the timer resolution down to 1 millisecond for
3424 // the duration of their interval.
3425 // We carefully set the resolution back, since otherwise we
3426 // seem to incur an overhead (3%?) that we don't need.
3427 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3428 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3429 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3430 // timeBeginPeriod() if the relative error exceeded some threshold.
3431 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3432 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3433 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3434 // resolution timers running.
3435 private:
3436 jlong resolution;
3437 public:
3438 HighResolutionInterval(jlong ms) {
3439 resolution = ms % 10L;
3440 if (resolution != 0) {
3441 MMRESULT result = timeBeginPeriod(1L);
3442 }
3443 }
3444 ~HighResolutionInterval() {
3445 if (resolution != 0) {
3446 MMRESULT result = timeEndPeriod(1L);
3447 }
3448 resolution = 0L;
3449 }
3450 };
3451
3452 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3453 jlong limit = (jlong) MAXDWORD;
3454
3455 while(ms > limit) {
3456 int res;
3457 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3458 return res;
3459 ms -= limit;
3460 }
3461
3462 assert(thread == Thread::current(), "thread consistency check");
3463 OSThread* osthread = thread->osthread();
3464 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3465 int result;
3466 if (interruptable) {
3467 assert(thread->is_Java_thread(), "must be java thread");
3468 JavaThread *jt = (JavaThread *) thread;
3469 ThreadBlockInVM tbivm(jt);
3470
3471 jt->set_suspend_equivalent();
3472 // cleared by handle_special_suspend_equivalent_condition() or
3473 // java_suspend_self() via check_and_wait_while_suspended()
3474
3475 HANDLE events[1];
3476 events[0] = osthread->interrupt_event();
3477 HighResolutionInterval *phri=NULL;
3478 if(!ForceTimeHighResolution)
3479 phri = new HighResolutionInterval( ms );
3480 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3481 result = OS_TIMEOUT;
3482 } else {
3483 ResetEvent(osthread->interrupt_event());
3484 osthread->set_interrupted(false);
3485 result = OS_INTRPT;
3486 }
3487 delete phri; //if it is NULL, harmless
3488
3489 // were we externally suspended while we were waiting?
3490 jt->check_and_wait_while_suspended();
3491 } else {
3492 assert(!thread->is_Java_thread(), "must not be java thread");
3493 Sleep((long) ms);
3494 result = OS_TIMEOUT;
3495 }
3496 return result;
3497 }
3498
3499 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3500 void os::infinite_sleep() {
3501 while (true) { // sleep forever ...
3502 Sleep(100000); // ... 100 seconds at a time
3503 }
3504 }
3505
3506 typedef BOOL (WINAPI * STTSignature)(void) ;
3507
3508 os::YieldResult os::NakedYield() {
3509 // Use either SwitchToThread() or Sleep(0)
3510 // Consider passing back the return value from SwitchToThread().
3511 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3512 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3513 } else {
3514 Sleep(0);
3515 }
3516 return os::YIELD_UNKNOWN ;
3517 }
3518
3519 void os::yield() { os::NakedYield(); }
3520
3521 void os::yield_all(int attempts) {
3522 // Yields to all threads, including threads with lower priorities
3523 Sleep(1);
3524 }
3525
3526 // Win32 only gives you access to seven real priorities at a time,
3527 // so we compress Java's ten down to seven. It would be better
3528 // if we dynamically adjusted relative priorities.
3529
3530 int os::java_to_os_priority[CriticalPriority + 1] = {
3531 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3532 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3533 THREAD_PRIORITY_LOWEST, // 2
3534 THREAD_PRIORITY_BELOW_NORMAL, // 3
3535 THREAD_PRIORITY_BELOW_NORMAL, // 4
3536 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3537 THREAD_PRIORITY_NORMAL, // 6
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3540 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3541 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3542 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3543 };
3544
3545 int prio_policy1[CriticalPriority + 1] = {
3546 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3547 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3548 THREAD_PRIORITY_LOWEST, // 2
3549 THREAD_PRIORITY_BELOW_NORMAL, // 3
3550 THREAD_PRIORITY_BELOW_NORMAL, // 4
3551 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3552 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3553 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3554 THREAD_PRIORITY_HIGHEST, // 8
3555 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3556 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3557 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3558 };
3559
3560 static int prio_init() {
3561 // If ThreadPriorityPolicy is 1, switch tables
3562 if (ThreadPriorityPolicy == 1) {
3563 int i;
3564 for (i = 0; i < CriticalPriority + 1; i++) {
3565 os::java_to_os_priority[i] = prio_policy1[i];
3566 }
3567 }
3568 if (UseCriticalJavaThreadPriority) {
3569 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3570 }
3571 return 0;
3572 }
3573
3574 OSReturn os::set_native_priority(Thread* thread, int priority) {
3575 if (!UseThreadPriorities) return OS_OK;
3576 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3577 return ret ? OS_OK : OS_ERR;
3578 }
3579
3580 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3581 if ( !UseThreadPriorities ) {
3582 *priority_ptr = java_to_os_priority[NormPriority];
3583 return OS_OK;
3584 }
3585 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3586 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3587 assert(false, "GetThreadPriority failed");
3588 return OS_ERR;
3589 }
3590 *priority_ptr = os_prio;
3591 return OS_OK;
3592 }
3593
3594
3595 // Hint to the underlying OS that a task switch would not be good.
3596 // Void return because it's a hint and can fail.
3597 void os::hint_no_preempt() {}
3598
3599 void os::interrupt(Thread* thread) {
3600 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3601 "possibility of dangling Thread pointer");
3602
3603 OSThread* osthread = thread->osthread();
3604 osthread->set_interrupted(true);
3605 // More than one thread can get here with the same value of osthread,
3606 // resulting in multiple notifications. We do, however, want the store
3607 // to interrupted() to be visible to other threads before we post
3608 // the interrupt event.
3609 OrderAccess::release();
3610 SetEvent(osthread->interrupt_event());
3611 // For JSR166: unpark after setting status
3612 if (thread->is_Java_thread())
3613 ((JavaThread*)thread)->parker()->unpark();
3614
3615 ParkEvent * ev = thread->_ParkEvent ;
3616 if (ev != NULL) ev->unpark() ;
3617
3618 }
3619
3620
3621 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3622 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3623 "possibility of dangling Thread pointer");
3624
3625 OSThread* osthread = thread->osthread();
3626 bool interrupted = osthread->interrupted();
3627 // There is no synchronization between the setting of the interrupt
3628 // and it being cleared here. It is critical - see 6535709 - that
3629 // we only clear the interrupt state, and reset the interrupt event,
3630 // if we are going to report that we were indeed interrupted - else
3631 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3632 // depending on the timing
3633 if (interrupted && clear_interrupted) {
3634 osthread->set_interrupted(false);
3635 ResetEvent(osthread->interrupt_event());
3636 } // Otherwise leave the interrupted state alone
3637
3638 return interrupted;
3639 }
3640
3641 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3642 ExtendedPC os::get_thread_pc(Thread* thread) {
3643 CONTEXT context;
3644 context.ContextFlags = CONTEXT_CONTROL;
3645 HANDLE handle = thread->osthread()->thread_handle();
3646 #ifdef _M_IA64
3647 assert(0, "Fix get_thread_pc");
3648 return ExtendedPC(NULL);
3649 #else
3650 if (GetThreadContext(handle, &context)) {
3651 #ifdef _M_AMD64
3652 return ExtendedPC((address) context.Rip);
3653 #else
3654 return ExtendedPC((address) context.Eip);
3655 #endif
3656 } else {
3657 return ExtendedPC(NULL);
3658 }
3659 #endif
3660 }
3661
3662 // GetCurrentThreadId() returns DWORD
3663 intx os::current_thread_id() { return GetCurrentThreadId(); }
3664
3665 static int _initial_pid = 0;
3666
3667 int os::current_process_id()
3668 {
3669 return (_initial_pid ? _initial_pid : _getpid());
3670 }
3671
3672 int os::win32::_vm_page_size = 0;
3673 int os::win32::_vm_allocation_granularity = 0;
3674 int os::win32::_processor_type = 0;
3675 // Processor level is not available on non-NT systems, use vm_version instead
3676 int os::win32::_processor_level = 0;
3677 julong os::win32::_physical_memory = 0;
3678 size_t os::win32::_default_stack_size = 0;
3679
3680 intx os::win32::_os_thread_limit = 0;
3681 volatile intx os::win32::_os_thread_count = 0;
3682
3683 bool os::win32::_is_nt = false;
3684 bool os::win32::_is_windows_2003 = false;
3685 bool os::win32::_is_windows_server = false;
3686
3687 void os::win32::initialize_system_info() {
3688 SYSTEM_INFO si;
3689 GetSystemInfo(&si);
3690 _vm_page_size = si.dwPageSize;
3691 _vm_allocation_granularity = si.dwAllocationGranularity;
3692 _processor_type = si.dwProcessorType;
3693 _processor_level = si.wProcessorLevel;
3694 set_processor_count(si.dwNumberOfProcessors);
3695
3696 MEMORYSTATUSEX ms;
3697 ms.dwLength = sizeof(ms);
3698
3699 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3700 // dwMemoryLoad (% of memory in use)
3701 GlobalMemoryStatusEx(&ms);
3702 _physical_memory = ms.ullTotalPhys;
3703
3704 OSVERSIONINFOEX oi;
3705 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3706 GetVersionEx((OSVERSIONINFO*)&oi);
3707 switch(oi.dwPlatformId) {
3708 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3709 case VER_PLATFORM_WIN32_NT:
3710 _is_nt = true;
3711 {
3712 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3713 if (os_vers == 5002) {
3714 _is_windows_2003 = true;
3715 }
3716 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3717 oi.wProductType == VER_NT_SERVER) {
3718 _is_windows_server = true;
3719 }
3720 }
3721 break;
3722 default: fatal("Unknown platform");
3723 }
3724
3725 _default_stack_size = os::current_stack_size();
3726 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3727 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3728 "stack size not a multiple of page size");
3729
3730 initialize_performance_counter();
3731
3732 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3733 // known to deadlock the system, if the VM issues to thread operations with
3734 // a too high frequency, e.g., such as changing the priorities.
3735 // The 6000 seems to work well - no deadlocks has been notices on the test
3736 // programs that we have seen experience this problem.
3737 if (!os::win32::is_nt()) {
3738 StarvationMonitorInterval = 6000;
3739 }
3740 }
3741
3742
3743 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3744 char path[MAX_PATH];
3745 DWORD size;
3746 DWORD pathLen = (DWORD)sizeof(path);
3747 HINSTANCE result = NULL;
3748
3749 // only allow library name without path component
3750 assert(strchr(name, '\\') == NULL, "path not allowed");
3751 assert(strchr(name, ':') == NULL, "path not allowed");
3752 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3753 jio_snprintf(ebuf, ebuflen,
3754 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3755 return NULL;
3756 }
3757
3758 // search system directory
3759 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3760 strcat(path, "\\");
3761 strcat(path, name);
3762 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3763 return result;
3764 }
3765 }
3766
3767 // try Windows directory
3768 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3769 strcat(path, "\\");
3770 strcat(path, name);
3771 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3772 return result;
3773 }
3774 }
3775
3776 jio_snprintf(ebuf, ebuflen,
3777 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3778 return NULL;
3779 }
3780
3781 void os::win32::setmode_streams() {
3782 _setmode(_fileno(stdin), _O_BINARY);
3783 _setmode(_fileno(stdout), _O_BINARY);
3784 _setmode(_fileno(stderr), _O_BINARY);
3785 }
3786
3787
3788 bool os::is_debugger_attached() {
3789 return IsDebuggerPresent() ? true : false;
3790 }
3791
3792
3793 void os::wait_for_keypress_at_exit(void) {
3794 if (PauseAtExit) {
3795 fprintf(stderr, "Press any key to continue...\n");
3796 fgetc(stdin);
3797 }
3798 }
3799
3800
3801 int os::message_box(const char* title, const char* message) {
3802 int result = MessageBox(NULL, message, title,
3803 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3804 return result == IDYES;
3805 }
3806
3807 int os::allocate_thread_local_storage() {
3808 return TlsAlloc();
3809 }
3810
3811
3812 void os::free_thread_local_storage(int index) {
3813 TlsFree(index);
3814 }
3815
3816
3817 void os::thread_local_storage_at_put(int index, void* value) {
3818 TlsSetValue(index, value);
3819 assert(thread_local_storage_at(index) == value, "Just checking");
3820 }
3821
3822
3823 void* os::thread_local_storage_at(int index) {
3824 return TlsGetValue(index);
3825 }
3826
3827
3828 #ifndef PRODUCT
3829 #ifndef _WIN64
3830 // Helpers to check whether NX protection is enabled
3831 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3832 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3833 pex->ExceptionRecord->NumberParameters > 0 &&
3834 pex->ExceptionRecord->ExceptionInformation[0] ==
3835 EXCEPTION_INFO_EXEC_VIOLATION) {
3836 return EXCEPTION_EXECUTE_HANDLER;
3837 }
3838 return EXCEPTION_CONTINUE_SEARCH;
3839 }
3840
3841 void nx_check_protection() {
3842 // If NX is enabled we'll get an exception calling into code on the stack
3843 char code[] = { (char)0xC3 }; // ret
3844 void *code_ptr = (void *)code;
3845 __try {
3846 __asm call code_ptr
3847 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3848 tty->print_raw_cr("NX protection detected.");
3849 }
3850 }
3851 #endif // _WIN64
3852 #endif // PRODUCT
3853
3854 // this is called _before_ the global arguments have been parsed
3855 void os::init(void) {
3856 _initial_pid = _getpid();
3857
3858 init_random(1234567);
3859
3860 win32::initialize_system_info();
3861 win32::setmode_streams();
3862 init_page_sizes((size_t) win32::vm_page_size());
3863
3864 // For better scalability on MP systems (must be called after initialize_system_info)
3865 #ifndef PRODUCT
3866 if (is_MP()) {
3867 NoYieldsInMicrolock = true;
3868 }
3869 #endif
3870 // This may be overridden later when argument processing is done.
3871 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3872 os::win32::is_windows_2003());
3873
3874 // Initialize main_process and main_thread
3875 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3876 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3877 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3878 fatal("DuplicateHandle failed\n");
3879 }
3880 main_thread_id = (int) GetCurrentThreadId();
3881 }
3882
3883 // To install functions for atexit processing
3884 extern "C" {
3885 static void perfMemory_exit_helper() {
3886 perfMemory_exit();
3887 }
3888 }
3889
3890 static jint initSock();
3891
3892 // this is called _after_ the global arguments have been parsed
3893 jint os::init_2(void) {
3894 // Allocate a single page and mark it as readable for safepoint polling
3895 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3896 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3897
3898 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3899 guarantee( return_page != NULL, "Commit Failed for polling page");
3900
3901 os::set_polling_page( polling_page );
3902
3903 #ifndef PRODUCT
3904 if( Verbose && PrintMiscellaneous )
3905 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3906 #endif
3907
3908 if (!UseMembar) {
3909 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3910 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3911
3912 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3913 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3914
3915 os::set_memory_serialize_page( mem_serialize_page );
3916
3917 #ifndef PRODUCT
3918 if(Verbose && PrintMiscellaneous)
3919 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3920 #endif
3921 }
3922
3923 // Setup Windows Exceptions
3924
3925 // for debugging float code generation bugs
3926 if (ForceFloatExceptions) {
3927 #ifndef _WIN64
3928 static long fp_control_word = 0;
3929 __asm { fstcw fp_control_word }
3930 // see Intel PPro Manual, Vol. 2, p 7-16
3931 const long precision = 0x20;
3932 const long underflow = 0x10;
3933 const long overflow = 0x08;
3934 const long zero_div = 0x04;
3935 const long denorm = 0x02;
3936 const long invalid = 0x01;
3937 fp_control_word |= invalid;
3938 __asm { fldcw fp_control_word }
3939 #endif
3940 }
3941
3942 // If stack_commit_size is 0, windows will reserve the default size,
3943 // but only commit a small portion of it.
3944 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3945 size_t default_reserve_size = os::win32::default_stack_size();
3946 size_t actual_reserve_size = stack_commit_size;
3947 if (stack_commit_size < default_reserve_size) {
3948 // If stack_commit_size == 0, we want this too
3949 actual_reserve_size = default_reserve_size;
3950 }
3951
3952 // Check minimum allowable stack size for thread creation and to initialize
3953 // the java system classes, including StackOverflowError - depends on page
3954 // size. Add a page for compiler2 recursion in main thread.
3955 // Add in 2*BytesPerWord times page size to account for VM stack during
3956 // class initialization depending on 32 or 64 bit VM.
3957 size_t min_stack_allowed =
3958 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3959 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3960 if (actual_reserve_size < min_stack_allowed) {
3961 tty->print_cr("\nThe stack size specified is too small, "
3962 "Specify at least %dk",
3963 min_stack_allowed / K);
3964 return JNI_ERR;
3965 }
3966
3967 JavaThread::set_stack_size_at_create(stack_commit_size);
3968
3969 // Calculate theoretical max. size of Threads to guard gainst artifical
3970 // out-of-memory situations, where all available address-space has been
3971 // reserved by thread stacks.
3972 assert(actual_reserve_size != 0, "Must have a stack");
3973
3974 // Calculate the thread limit when we should start doing Virtual Memory
3975 // banging. Currently when the threads will have used all but 200Mb of space.
3976 //
3977 // TODO: consider performing a similar calculation for commit size instead
3978 // as reserve size, since on a 64-bit platform we'll run into that more
3979 // often than running out of virtual memory space. We can use the
3980 // lower value of the two calculations as the os_thread_limit.
3981 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3982 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3983
3984 // at exit methods are called in the reverse order of their registration.
3985 // there is no limit to the number of functions registered. atexit does
3986 // not set errno.
3987
3988 if (PerfAllowAtExitRegistration) {
3989 // only register atexit functions if PerfAllowAtExitRegistration is set.
3990 // atexit functions can be delayed until process exit time, which
3991 // can be problematic for embedded VM situations. Embedded VMs should
3992 // call DestroyJavaVM() to assure that VM resources are released.
3993
3994 // note: perfMemory_exit_helper atexit function may be removed in
3995 // the future if the appropriate cleanup code can be added to the
3996 // VM_Exit VMOperation's doit method.
3997 if (atexit(perfMemory_exit_helper) != 0) {
3998 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3999 }
4000 }
4001
4002 #ifndef _WIN64
4003 // Print something if NX is enabled (win32 on AMD64)
4004 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4005 #endif
4006
4007 // initialize thread priority policy
4008 prio_init();
4009
4010 if (UseNUMA && !ForceNUMA) {
4011 UseNUMA = false; // We don't fully support this yet
4012 }
4013
4014 if (UseNUMAInterleaving) {
4015 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4016 bool success = numa_interleaving_init();
4017 if (!success) UseNUMAInterleaving = false;
4018 }
4019
4020 if (initSock() != JNI_OK) {
4021 return JNI_ERR;
4022 }
4023
4024 return JNI_OK;
4025 }
4026
4027 void os::init_3(void) {
4028 return;
4029 }
4030
4031 // Mark the polling page as unreadable
4032 void os::make_polling_page_unreadable(void) {
4033 DWORD old_status;
4034 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4035 fatal("Could not disable polling page");
4036 };
4037
4038 // Mark the polling page as readable
4039 void os::make_polling_page_readable(void) {
4040 DWORD old_status;
4041 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4042 fatal("Could not enable polling page");
4043 };
4044
4045
4046 int os::stat(const char *path, struct stat *sbuf) {
4047 char pathbuf[MAX_PATH];
4048 if (strlen(path) > MAX_PATH - 1) {
4049 errno = ENAMETOOLONG;
4050 return -1;
4051 }
4052 os::native_path(strcpy(pathbuf, path));
4053 int ret = ::stat(pathbuf, sbuf);
4054 if (sbuf != NULL && UseUTCFileTimestamp) {
4055 // Fix for 6539723. st_mtime returned from stat() is dependent on
4056 // the system timezone and so can return different values for the
4057 // same file if/when daylight savings time changes. This adjustment
4058 // makes sure the same timestamp is returned regardless of the TZ.
4059 //
4060 // See:
4061 // http://msdn.microsoft.com/library/
4062 // default.asp?url=/library/en-us/sysinfo/base/
4063 // time_zone_information_str.asp
4064 // and
4065 // http://msdn.microsoft.com/library/default.asp?url=
4066 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4067 //
4068 // NOTE: there is a insidious bug here: If the timezone is changed
4069 // after the call to stat() but before 'GetTimeZoneInformation()', then
4070 // the adjustment we do here will be wrong and we'll return the wrong
4071 // value (which will likely end up creating an invalid class data
4072 // archive). Absent a better API for this, or some time zone locking
4073 // mechanism, we'll have to live with this risk.
4074 TIME_ZONE_INFORMATION tz;
4075 DWORD tzid = GetTimeZoneInformation(&tz);
4076 int daylightBias =
4077 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4078 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4079 }
4080 return ret;
4081 }
4082
4083
4084 #define FT2INT64(ft) \
4085 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4086
4087
4088 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4089 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4090 // of a thread.
4091 //
4092 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4093 // the fast estimate available on the platform.
4094
4095 // current_thread_cpu_time() is not optimized for Windows yet
4096 jlong os::current_thread_cpu_time() {
4097 // return user + sys since the cost is the same
4098 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4099 }
4100
4101 jlong os::thread_cpu_time(Thread* thread) {
4102 // consistent with what current_thread_cpu_time() returns.
4103 return os::thread_cpu_time(thread, true /* user+sys */);
4104 }
4105
4106 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4107 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4108 }
4109
4110 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4111 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4112 // If this function changes, os::is_thread_cpu_time_supported() should too
4113 if (os::win32::is_nt()) {
4114 FILETIME CreationTime;
4115 FILETIME ExitTime;
4116 FILETIME KernelTime;
4117 FILETIME UserTime;
4118
4119 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4120 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4121 return -1;
4122 else
4123 if (user_sys_cpu_time) {
4124 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4125 } else {
4126 return FT2INT64(UserTime) * 100;
4127 }
4128 } else {
4129 return (jlong) timeGetTime() * 1000000;
4130 }
4131 }
4132
4133 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4134 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4135 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4136 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4137 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4138 }
4139
4140 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4141 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4142 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4143 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4144 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4145 }
4146
4147 bool os::is_thread_cpu_time_supported() {
4148 // see os::thread_cpu_time
4149 if (os::win32::is_nt()) {
4150 FILETIME CreationTime;
4151 FILETIME ExitTime;
4152 FILETIME KernelTime;
4153 FILETIME UserTime;
4154
4155 if ( GetThreadTimes(GetCurrentThread(),
4156 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4157 return false;
4158 else
4159 return true;
4160 } else {
4161 return false;
4162 }
4163 }
4164
4165 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4166 // It does have primitives (PDH API) to get CPU usage and run queue length.
4167 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4168 // If we wanted to implement loadavg on Windows, we have a few options:
4169 //
4170 // a) Query CPU usage and run queue length and "fake" an answer by
4171 // returning the CPU usage if it's under 100%, and the run queue
4172 // length otherwise. It turns out that querying is pretty slow
4173 // on Windows, on the order of 200 microseconds on a fast machine.
4174 // Note that on the Windows the CPU usage value is the % usage
4175 // since the last time the API was called (and the first call
4176 // returns 100%), so we'd have to deal with that as well.
4177 //
4178 // b) Sample the "fake" answer using a sampling thread and store
4179 // the answer in a global variable. The call to loadavg would
4180 // just return the value of the global, avoiding the slow query.
4181 //
4182 // c) Sample a better answer using exponential decay to smooth the
4183 // value. This is basically the algorithm used by UNIX kernels.
4184 //
4185 // Note that sampling thread starvation could affect both (b) and (c).
4186 int os::loadavg(double loadavg[], int nelem) {
4187 return -1;
4188 }
4189
4190
4191 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4192 bool os::dont_yield() {
4193 return DontYieldALot;
4194 }
4195
4196 // This method is a slightly reworked copy of JDK's sysOpen
4197 // from src/windows/hpi/src/sys_api_md.c
4198
4199 int os::open(const char *path, int oflag, int mode) {
4200 char pathbuf[MAX_PATH];
4201
4202 if (strlen(path) > MAX_PATH - 1) {
4203 errno = ENAMETOOLONG;
4204 return -1;
4205 }
4206 os::native_path(strcpy(pathbuf, path));
4207 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4208 }
4209
4210 FILE* os::open(int fd, const char* mode) {
4211 return ::_fdopen(fd, mode);
4212 }
4213
4214 // Is a (classpath) directory empty?
4215 bool os::dir_is_empty(const char* path) {
4216 WIN32_FIND_DATA fd;
4217 HANDLE f = FindFirstFile(path, &fd);
4218 if (f == INVALID_HANDLE_VALUE) {
4219 return true;
4220 }
4221 FindClose(f);
4222 return false;
4223 }
4224
4225 // create binary file, rewriting existing file if required
4226 int os::create_binary_file(const char* path, bool rewrite_existing) {
4227 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4228 if (!rewrite_existing) {
4229 oflags |= _O_EXCL;
4230 }
4231 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4232 }
4233
4234 // return current position of file pointer
4235 jlong os::current_file_offset(int fd) {
4236 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4237 }
4238
4239 // move file pointer to the specified offset
4240 jlong os::seek_to_file_offset(int fd, jlong offset) {
4241 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4242 }
4243
4244
4245 jlong os::lseek(int fd, jlong offset, int whence) {
4246 return (jlong) ::_lseeki64(fd, offset, whence);
4247 }
4248
4249 // This method is a slightly reworked copy of JDK's sysNativePath
4250 // from src/windows/hpi/src/path_md.c
4251
4252 /* Convert a pathname to native format. On win32, this involves forcing all
4253 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4254 sometimes rejects '/') and removing redundant separators. The input path is
4255 assumed to have been converted into the character encoding used by the local
4256 system. Because this might be a double-byte encoding, care is taken to
4257 treat double-byte lead characters correctly.
4258
4259 This procedure modifies the given path in place, as the result is never
4260 longer than the original. There is no error return; this operation always
4261 succeeds. */
4262 char * os::native_path(char *path) {
4263 char *src = path, *dst = path, *end = path;
4264 char *colon = NULL; /* If a drive specifier is found, this will
4265 point to the colon following the drive
4266 letter */
4267
4268 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4269 assert(((!::IsDBCSLeadByte('/'))
4270 && (!::IsDBCSLeadByte('\\'))
4271 && (!::IsDBCSLeadByte(':'))),
4272 "Illegal lead byte");
4273
4274 /* Check for leading separators */
4275 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4276 while (isfilesep(*src)) {
4277 src++;
4278 }
4279
4280 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4281 /* Remove leading separators if followed by drive specifier. This
4282 hack is necessary to support file URLs containing drive
4283 specifiers (e.g., "file://c:/path"). As a side effect,
4284 "/c:/path" can be used as an alternative to "c:/path". */
4285 *dst++ = *src++;
4286 colon = dst;
4287 *dst++ = ':';
4288 src++;
4289 } else {
4290 src = path;
4291 if (isfilesep(src[0]) && isfilesep(src[1])) {
4292 /* UNC pathname: Retain first separator; leave src pointed at
4293 second separator so that further separators will be collapsed
4294 into the second separator. The result will be a pathname
4295 beginning with "\\\\" followed (most likely) by a host name. */
4296 src = dst = path + 1;
4297 path[0] = '\\'; /* Force first separator to '\\' */
4298 }
4299 }
4300
4301 end = dst;
4302
4303 /* Remove redundant separators from remainder of path, forcing all
4304 separators to be '\\' rather than '/'. Also, single byte space
4305 characters are removed from the end of the path because those
4306 are not legal ending characters on this operating system.
4307 */
4308 while (*src != '\0') {
4309 if (isfilesep(*src)) {
4310 *dst++ = '\\'; src++;
4311 while (isfilesep(*src)) src++;
4312 if (*src == '\0') {
4313 /* Check for trailing separator */
4314 end = dst;
4315 if (colon == dst - 2) break; /* "z:\\" */
4316 if (dst == path + 1) break; /* "\\" */
4317 if (dst == path + 2 && isfilesep(path[0])) {
4318 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4319 beginning of a UNC pathname. Even though it is not, by
4320 itself, a valid UNC pathname, we leave it as is in order
4321 to be consistent with the path canonicalizer as well
4322 as the win32 APIs, which treat this case as an invalid
4323 UNC pathname rather than as an alias for the root
4324 directory of the current drive. */
4325 break;
4326 }
4327 end = --dst; /* Path does not denote a root directory, so
4328 remove trailing separator */
4329 break;
4330 }
4331 end = dst;
4332 } else {
4333 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4334 *dst++ = *src++;
4335 if (*src) *dst++ = *src++;
4336 end = dst;
4337 } else { /* Copy a single-byte character */
4338 char c = *src++;
4339 *dst++ = c;
4340 /* Space is not a legal ending character */
4341 if (c != ' ') end = dst;
4342 }
4343 }
4344 }
4345
4346 *end = '\0';
4347
4348 /* For "z:", add "." to work around a bug in the C runtime library */
4349 if (colon == dst - 1) {
4350 path[2] = '.';
4351 path[3] = '\0';
4352 }
4353
4354 return path;
4355 }
4356
4357 // This code is a copy of JDK's sysSetLength
4358 // from src/windows/hpi/src/sys_api_md.c
4359
4360 int os::ftruncate(int fd, jlong length) {
4361 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4362 long high = (long)(length >> 32);
4363 DWORD ret;
4364
4365 if (h == (HANDLE)(-1)) {
4366 return -1;
4367 }
4368
4369 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4370 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4371 return -1;
4372 }
4373
4374 if (::SetEndOfFile(h) == FALSE) {
4375 return -1;
4376 }
4377
4378 return 0;
4379 }
4380
4381
4382 // This code is a copy of JDK's sysSync
4383 // from src/windows/hpi/src/sys_api_md.c
4384 // except for the legacy workaround for a bug in Win 98
4385
4386 int os::fsync(int fd) {
4387 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4388
4389 if ( (!::FlushFileBuffers(handle)) &&
4390 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4391 /* from winerror.h */
4392 return -1;
4393 }
4394 return 0;
4395 }
4396
4397 static int nonSeekAvailable(int, long *);
4398 static int stdinAvailable(int, long *);
4399
4400 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4401 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4402
4403 // This code is a copy of JDK's sysAvailable
4404 // from src/windows/hpi/src/sys_api_md.c
4405
4406 int os::available(int fd, jlong *bytes) {
4407 jlong cur, end;
4408 struct _stati64 stbuf64;
4409
4410 if (::_fstati64(fd, &stbuf64) >= 0) {
4411 int mode = stbuf64.st_mode;
4412 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4413 int ret;
4414 long lpbytes;
4415 if (fd == 0) {
4416 ret = stdinAvailable(fd, &lpbytes);
4417 } else {
4418 ret = nonSeekAvailable(fd, &lpbytes);
4419 }
4420 (*bytes) = (jlong)(lpbytes);
4421 return ret;
4422 }
4423 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4424 return FALSE;
4425 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4426 return FALSE;
4427 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4428 return FALSE;
4429 }
4430 *bytes = end - cur;
4431 return TRUE;
4432 } else {
4433 return FALSE;
4434 }
4435 }
4436
4437 // This code is a copy of JDK's nonSeekAvailable
4438 // from src/windows/hpi/src/sys_api_md.c
4439
4440 static int nonSeekAvailable(int fd, long *pbytes) {
4441 /* This is used for available on non-seekable devices
4442 * (like both named and anonymous pipes, such as pipes
4443 * connected to an exec'd process).
4444 * Standard Input is a special case.
4445 *
4446 */
4447 HANDLE han;
4448
4449 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4450 return FALSE;
4451 }
4452
4453 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4454 /* PeekNamedPipe fails when at EOF. In that case we
4455 * simply make *pbytes = 0 which is consistent with the
4456 * behavior we get on Solaris when an fd is at EOF.
4457 * The only alternative is to raise an Exception,
4458 * which isn't really warranted.
4459 */
4460 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4461 return FALSE;
4462 }
4463 *pbytes = 0;
4464 }
4465 return TRUE;
4466 }
4467
4468 #define MAX_INPUT_EVENTS 2000
4469
4470 // This code is a copy of JDK's stdinAvailable
4471 // from src/windows/hpi/src/sys_api_md.c
4472
4473 static int stdinAvailable(int fd, long *pbytes) {
4474 HANDLE han;
4475 DWORD numEventsRead = 0; /* Number of events read from buffer */
4476 DWORD numEvents = 0; /* Number of events in buffer */
4477 DWORD i = 0; /* Loop index */
4478 DWORD curLength = 0; /* Position marker */
4479 DWORD actualLength = 0; /* Number of bytes readable */
4480 BOOL error = FALSE; /* Error holder */
4481 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4482
4483 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4484 return FALSE;
4485 }
4486
4487 /* Construct an array of input records in the console buffer */
4488 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4489 if (error == 0) {
4490 return nonSeekAvailable(fd, pbytes);
4491 }
4492
4493 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4494 if (numEvents > MAX_INPUT_EVENTS) {
4495 numEvents = MAX_INPUT_EVENTS;
4496 }
4497
4498 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4499 if (lpBuffer == NULL) {
4500 return FALSE;
4501 }
4502
4503 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4504 if (error == 0) {
4505 os::free(lpBuffer, mtInternal);
4506 return FALSE;
4507 }
4508
4509 /* Examine input records for the number of bytes available */
4510 for(i=0; i<numEvents; i++) {
4511 if (lpBuffer[i].EventType == KEY_EVENT) {
4512
4513 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4514 &(lpBuffer[i].Event);
4515 if (keyRecord->bKeyDown == TRUE) {
4516 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4517 curLength++;
4518 if (*keyPressed == '\r') {
4519 actualLength = curLength;
4520 }
4521 }
4522 }
4523 }
4524
4525 if(lpBuffer != NULL) {
4526 os::free(lpBuffer, mtInternal);
4527 }
4528
4529 *pbytes = (long) actualLength;
4530 return TRUE;
4531 }
4532
4533 // Map a block of memory.
4534 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4535 char *addr, size_t bytes, bool read_only,
4536 bool allow_exec) {
4537 HANDLE hFile;
4538 char* base;
4539
4540 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4541 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4542 if (hFile == NULL) {
4543 if (PrintMiscellaneous && Verbose) {
4544 DWORD err = GetLastError();
4545 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4546 }
4547 return NULL;
4548 }
4549
4550 if (allow_exec) {
4551 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4552 // unless it comes from a PE image (which the shared archive is not.)
4553 // Even VirtualProtect refuses to give execute access to mapped memory
4554 // that was not previously executable.
4555 //
4556 // Instead, stick the executable region in anonymous memory. Yuck.
4557 // Penalty is that ~4 pages will not be shareable - in the future
4558 // we might consider DLLizing the shared archive with a proper PE
4559 // header so that mapping executable + sharing is possible.
4560
4561 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4562 PAGE_READWRITE);
4563 if (base == NULL) {
4564 if (PrintMiscellaneous && Verbose) {
4565 DWORD err = GetLastError();
4566 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4567 }
4568 CloseHandle(hFile);
4569 return NULL;
4570 }
4571
4572 DWORD bytes_read;
4573 OVERLAPPED overlapped;
4574 overlapped.Offset = (DWORD)file_offset;
4575 overlapped.OffsetHigh = 0;
4576 overlapped.hEvent = NULL;
4577 // ReadFile guarantees that if the return value is true, the requested
4578 // number of bytes were read before returning.
4579 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4580 if (!res) {
4581 if (PrintMiscellaneous && Verbose) {
4582 DWORD err = GetLastError();
4583 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4584 }
4585 release_memory(base, bytes);
4586 CloseHandle(hFile);
4587 return NULL;
4588 }
4589 } else {
4590 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4591 NULL /*file_name*/);
4592 if (hMap == NULL) {
4593 if (PrintMiscellaneous && Verbose) {
4594 DWORD err = GetLastError();
4595 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4596 }
4597 CloseHandle(hFile);
4598 return NULL;
4599 }
4600
4601 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4602 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4603 (DWORD)bytes, addr);
4604 if (base == NULL) {
4605 if (PrintMiscellaneous && Verbose) {
4606 DWORD err = GetLastError();
4607 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4608 }
4609 CloseHandle(hMap);
4610 CloseHandle(hFile);
4611 return NULL;
4612 }
4613
4614 if (CloseHandle(hMap) == 0) {
4615 if (PrintMiscellaneous && Verbose) {
4616 DWORD err = GetLastError();
4617 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4618 }
4619 CloseHandle(hFile);
4620 return base;
4621 }
4622 }
4623
4624 if (allow_exec) {
4625 DWORD old_protect;
4626 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4627 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4628
4629 if (!res) {
4630 if (PrintMiscellaneous && Verbose) {
4631 DWORD err = GetLastError();
4632 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4633 }
4634 // Don't consider this a hard error, on IA32 even if the
4635 // VirtualProtect fails, we should still be able to execute
4636 CloseHandle(hFile);
4637 return base;
4638 }
4639 }
4640
4641 if (CloseHandle(hFile) == 0) {
4642 if (PrintMiscellaneous && Verbose) {
4643 DWORD err = GetLastError();
4644 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4645 }
4646 return base;
4647 }
4648
4649 return base;
4650 }
4651
4652
4653 // Remap a block of memory.
4654 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4655 char *addr, size_t bytes, bool read_only,
4656 bool allow_exec) {
4657 // This OS does not allow existing memory maps to be remapped so we
4658 // have to unmap the memory before we remap it.
4659 if (!os::unmap_memory(addr, bytes)) {
4660 return NULL;
4661 }
4662
4663 // There is a very small theoretical window between the unmap_memory()
4664 // call above and the map_memory() call below where a thread in native
4665 // code may be able to access an address that is no longer mapped.
4666
4667 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4668 read_only, allow_exec);
4669 }
4670
4671
4672 // Unmap a block of memory.
4673 // Returns true=success, otherwise false.
4674
4675 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4676 BOOL result = UnmapViewOfFile(addr);
4677 if (result == 0) {
4678 if (PrintMiscellaneous && Verbose) {
4679 DWORD err = GetLastError();
4680 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4681 }
4682 return false;
4683 }
4684 return true;
4685 }
4686
4687 void os::pause() {
4688 char filename[MAX_PATH];
4689 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4690 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4691 } else {
4692 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4693 }
4694
4695 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4696 if (fd != -1) {
4697 struct stat buf;
4698 ::close(fd);
4699 while (::stat(filename, &buf) == 0) {
4700 Sleep(100);
4701 }
4702 } else {
4703 jio_fprintf(stderr,
4704 "Could not open pause file '%s', continuing immediately.\n", filename);
4705 }
4706 }
4707
4708 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4709 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4710 }
4711
4712 /*
4713 * See the caveats for this class in os_windows.hpp
4714 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4715 * into this method and returns false. If no OS EXCEPTION was raised, returns
4716 * true.
4717 * The callback is supposed to provide the method that should be protected.
4718 */
4719 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4720 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4721 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4722 "crash_protection already set?");
4723
4724 bool success = true;
4725 __try {
4726 WatcherThread::watcher_thread()->set_crash_protection(this);
4727 cb.call();
4728 } __except(EXCEPTION_EXECUTE_HANDLER) {
4729 // only for protection, nothing to do
4730 success = false;
4731 }
4732 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4733 return success;
4734 }
4735
4736 // An Event wraps a win32 "CreateEvent" kernel handle.
4737 //
4738 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4739 //
4740 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4741 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4742 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4743 // In addition, an unpark() operation might fetch the handle field, but the
4744 // event could recycle between the fetch and the SetEvent() operation.
4745 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4746 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4747 // on an stale but recycled handle would be harmless, but in practice this might
4748 // confuse other non-Sun code, so it's not a viable approach.
4749 //
4750 // 2: Once a win32 event handle is associated with an Event, it remains associated
4751 // with the Event. The event handle is never closed. This could be construed
4752 // as handle leakage, but only up to the maximum # of threads that have been extant
4753 // at any one time. This shouldn't be an issue, as windows platforms typically
4754 // permit a process to have hundreds of thousands of open handles.
4755 //
4756 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4757 // and release unused handles.
4758 //
4759 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4760 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4761 //
4762 // 5. Use an RCU-like mechanism (Read-Copy Update).
4763 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4764 //
4765 // We use (2).
4766 //
4767 // TODO-FIXME:
4768 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4769 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4770 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4771 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4772 // into a single win32 CreateEvent() handle.
4773 //
4774 // _Event transitions in park()
4775 // -1 => -1 : illegal
4776 // 1 => 0 : pass - return immediately
4777 // 0 => -1 : block
4778 //
4779 // _Event serves as a restricted-range semaphore :
4780 // -1 : thread is blocked
4781 // 0 : neutral - thread is running or ready
4782 // 1 : signaled - thread is running or ready
4783 //
4784 // Another possible encoding of _Event would be
4785 // with explicit "PARKED" and "SIGNALED" bits.
4786
4787 int os::PlatformEvent::park (jlong Millis) {
4788 guarantee (_ParkHandle != NULL , "Invariant") ;
4789 guarantee (Millis > 0 , "Invariant") ;
4790 int v ;
4791
4792 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4793 // the initial park() operation.
4794
4795 for (;;) {
4796 v = _Event ;
4797 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4798 }
4799 guarantee ((v == 0) || (v == 1), "invariant") ;
4800 if (v != 0) return OS_OK ;
4801
4802 // Do this the hard way by blocking ...
4803 // TODO: consider a brief spin here, gated on the success of recent
4804 // spin attempts by this thread.
4805 //
4806 // We decompose long timeouts into series of shorter timed waits.
4807 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4808 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4809 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4810 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4811 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4812 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4813 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4814 // for the already waited time. This policy does not admit any new outcomes.
4815 // In the future, however, we might want to track the accumulated wait time and
4816 // adjust Millis accordingly if we encounter a spurious wakeup.
4817
4818 const int MAXTIMEOUT = 0x10000000 ;
4819 DWORD rv = WAIT_TIMEOUT ;
4820 while (_Event < 0 && Millis > 0) {
4821 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4822 if (Millis > MAXTIMEOUT) {
4823 prd = MAXTIMEOUT ;
4824 }
4825 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4826 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4827 if (rv == WAIT_TIMEOUT) {
4828 Millis -= prd ;
4829 }
4830 }
4831 v = _Event ;
4832 _Event = 0 ;
4833 // see comment at end of os::PlatformEvent::park() below:
4834 OrderAccess::fence() ;
4835 // If we encounter a nearly simultanous timeout expiry and unpark()
4836 // we return OS_OK indicating we awoke via unpark().
4837 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4838 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4839 }
4840
4841 void os::PlatformEvent::park () {
4842 guarantee (_ParkHandle != NULL, "Invariant") ;
4843 // Invariant: Only the thread associated with the Event/PlatformEvent
4844 // may call park().
4845 int v ;
4846 for (;;) {
4847 v = _Event ;
4848 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4849 }
4850 guarantee ((v == 0) || (v == 1), "invariant") ;
4851 if (v != 0) return ;
4852
4853 // Do this the hard way by blocking ...
4854 // TODO: consider a brief spin here, gated on the success of recent
4855 // spin attempts by this thread.
4856 while (_Event < 0) {
4857 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4858 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4859 }
4860
4861 // Usually we'll find _Event == 0 at this point, but as
4862 // an optional optimization we clear it, just in case can
4863 // multiple unpark() operations drove _Event up to 1.
4864 _Event = 0 ;
4865 OrderAccess::fence() ;
4866 guarantee (_Event >= 0, "invariant") ;
4867 }
4868
4869 void os::PlatformEvent::unpark() {
4870 guarantee (_ParkHandle != NULL, "Invariant") ;
4871
4872 // Transitions for _Event:
4873 // 0 :=> 1
4874 // 1 :=> 1
4875 // -1 :=> either 0 or 1; must signal target thread
4876 // That is, we can safely transition _Event from -1 to either
4877 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4878 // unpark() calls.
4879 // See also: "Semaphores in Plan 9" by Mullender & Cox
4880 //
4881 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4882 // that it will take two back-to-back park() calls for the owning
4883 // thread to block. This has the benefit of forcing a spurious return
4884 // from the first park() call after an unpark() call which will help
4885 // shake out uses of park() and unpark() without condition variables.
4886
4887 if (Atomic::xchg(1, &_Event) >= 0) return;
4888
4889 ::SetEvent(_ParkHandle);
4890 }
4891
4892
4893 // JSR166
4894 // -------------------------------------------------------
4895
4896 /*
4897 * The Windows implementation of Park is very straightforward: Basic
4898 * operations on Win32 Events turn out to have the right semantics to
4899 * use them directly. We opportunistically resuse the event inherited
4900 * from Monitor.
4901 */
4902
4903
4904 void Parker::park(bool isAbsolute, jlong time) {
4905 guarantee (_ParkEvent != NULL, "invariant") ;
4906 // First, demultiplex/decode time arguments
4907 if (time < 0) { // don't wait
4908 return;
4909 }
4910 else if (time == 0 && !isAbsolute) {
4911 time = INFINITE;
4912 }
4913 else if (isAbsolute) {
4914 time -= os::javaTimeMillis(); // convert to relative time
4915 if (time <= 0) // already elapsed
4916 return;
4917 }
4918 else { // relative
4919 time /= 1000000; // Must coarsen from nanos to millis
4920 if (time == 0) // Wait for the minimal time unit if zero
4921 time = 1;
4922 }
4923
4924 JavaThread* thread = (JavaThread*)(Thread::current());
4925 assert(thread->is_Java_thread(), "Must be JavaThread");
4926 JavaThread *jt = (JavaThread *)thread;
4927
4928 // Don't wait if interrupted or already triggered
4929 if (Thread::is_interrupted(thread, false) ||
4930 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4931 ResetEvent(_ParkEvent);
4932 return;
4933 }
4934 else {
4935 ThreadBlockInVM tbivm(jt);
4936 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4937 jt->set_suspend_equivalent();
4938
4939 WaitForSingleObject(_ParkEvent, time);
4940 ResetEvent(_ParkEvent);
4941
4942 // If externally suspended while waiting, re-suspend
4943 if (jt->handle_special_suspend_equivalent_condition()) {
4944 jt->java_suspend_self();
4945 }
4946 }
4947 }
4948
4949 void Parker::unpark() {
4950 guarantee (_ParkEvent != NULL, "invariant") ;
4951 SetEvent(_ParkEvent);
4952 }
4953
4954 // Run the specified command in a separate process. Return its exit value,
4955 // or -1 on failure (e.g. can't create a new process).
4956 int os::fork_and_exec(char* cmd) {
4957 STARTUPINFO si;
4958 PROCESS_INFORMATION pi;
4959
4960 memset(&si, 0, sizeof(si));
4961 si.cb = sizeof(si);
4962 memset(&pi, 0, sizeof(pi));
4963 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4964 cmd, // command line
4965 NULL, // process security attribute
4966 NULL, // thread security attribute
4967 TRUE, // inherits system handles
4968 0, // no creation flags
4969 NULL, // use parent's environment block
4970 NULL, // use parent's starting directory
4971 &si, // (in) startup information
4972 &pi); // (out) process information
4973
4974 if (rslt) {
4975 // Wait until child process exits.
4976 WaitForSingleObject(pi.hProcess, INFINITE);
4977
4978 DWORD exit_code;
4979 GetExitCodeProcess(pi.hProcess, &exit_code);
4980
4981 // Close process and thread handles.
4982 CloseHandle(pi.hProcess);
4983 CloseHandle(pi.hThread);
4984
4985 return (int)exit_code;
4986 } else {
4987 return -1;
4988 }
4989 }
4990
4991 //--------------------------------------------------------------------------------------------------
4992 // Non-product code
4993
4994 static int mallocDebugIntervalCounter = 0;
4995 static int mallocDebugCounter = 0;
4996 bool os::check_heap(bool force) {
4997 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4998 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4999 // Note: HeapValidate executes two hardware breakpoints when it finds something
5000 // wrong; at these points, eax contains the address of the offending block (I think).
5001 // To get to the exlicit error message(s) below, just continue twice.
5002 HANDLE heap = GetProcessHeap();
5003 { HeapLock(heap);
5004 PROCESS_HEAP_ENTRY phe;
5005 phe.lpData = NULL;
5006 while (HeapWalk(heap, &phe) != 0) {
5007 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5008 !HeapValidate(heap, 0, phe.lpData)) {
5009 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5010 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5011 fatal("corrupted C heap");
5012 }
5013 }
5014 DWORD err = GetLastError();
5015 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5016 fatal(err_msg("heap walk aborted with error %d", err));
5017 }
5018 HeapUnlock(heap);
5019 }
5020 mallocDebugIntervalCounter = 0;
5021 }
5022 return true;
5023 }
5024
5025
5026 bool os::find(address addr, outputStream* st) {
5027 // Nothing yet
5028 return false;
5029 }
5030
5031 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5032 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5033
5034 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5035 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5036 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5037 address addr = (address) exceptionRecord->ExceptionInformation[1];
5038
5039 if (os::is_memory_serialize_page(thread, addr))
5040 return EXCEPTION_CONTINUE_EXECUTION;
5041 }
5042
5043 return EXCEPTION_CONTINUE_SEARCH;
5044 }
5045
5046 // We don't build a headless jre for Windows
5047 bool os::is_headless_jre() { return false; }
5048
5049 static jint initSock() {
5050 WSADATA wsadata;
5051
5052 if (!os::WinSock2Dll::WinSock2Available()) {
5053 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5054 ::GetLastError());
5055 return JNI_ERR;
5056 }
5057
5058 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5059 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5060 ::GetLastError());
5061 return JNI_ERR;
5062 }
5063 return JNI_OK;
5064 }
5065
5066 struct hostent* os::get_host_by_name(char* name) {
5067 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5068 }
5069
5070 int os::socket_close(int fd) {
5071 return ::closesocket(fd);
5072 }
5073
5074 int os::socket_available(int fd, jint *pbytes) {
5075 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5076 return (ret < 0) ? 0 : 1;
5077 }
5078
5079 int os::socket(int domain, int type, int protocol) {
5080 return ::socket(domain, type, protocol);
5081 }
5082
5083 int os::listen(int fd, int count) {
5084 return ::listen(fd, count);
5085 }
5086
5087 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5088 return ::connect(fd, him, len);
5089 }
5090
5091 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5092 return ::accept(fd, him, len);
5093 }
5094
5095 int os::sendto(int fd, char* buf, size_t len, uint flags,
5096 struct sockaddr* to, socklen_t tolen) {
5097
5098 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5099 }
5100
5101 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5102 sockaddr* from, socklen_t* fromlen) {
5103
5104 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5105 }
5106
5107 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5108 return ::recv(fd, buf, (int)nBytes, flags);
5109 }
5110
5111 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5112 return ::send(fd, buf, (int)nBytes, flags);
5113 }
5114
5115 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5116 return ::send(fd, buf, (int)nBytes, flags);
5117 }
5118
5119 int os::timeout(int fd, long timeout) {
5120 fd_set tbl;
5121 struct timeval t;
5122
5123 t.tv_sec = timeout / 1000;
5124 t.tv_usec = (timeout % 1000) * 1000;
5125
5126 tbl.fd_count = 1;
5127 tbl.fd_array[0] = fd;
5128
5129 return ::select(1, &tbl, 0, 0, &t);
5130 }
5131
5132 int os::get_host_name(char* name, int namelen) {
5133 return ::gethostname(name, namelen);
5134 }
5135
5136 int os::socket_shutdown(int fd, int howto) {
5137 return ::shutdown(fd, howto);
5138 }
5139
5140 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5141 return ::bind(fd, him, len);
5142 }
5143
5144 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5145 return ::getsockname(fd, him, len);
5146 }
5147
5148 int os::get_sock_opt(int fd, int level, int optname,
5149 char* optval, socklen_t* optlen) {
5150 return ::getsockopt(fd, level, optname, optval, optlen);
5151 }
5152
5153 int os::set_sock_opt(int fd, int level, int optname,
5154 const char* optval, socklen_t optlen) {
5155 return ::setsockopt(fd, level, optname, optval, optlen);
5156 }
5157
5158 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5159 #if defined(IA32)
5160 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5161 #elif defined (AMD64)
5162 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5163 #endif
5164
5165 // returns true if thread could be suspended,
5166 // false otherwise
5167 static bool do_suspend(HANDLE* h) {
5168 if (h != NULL) {
5169 if (SuspendThread(*h) != ~0) {
5170 return true;
5171 }
5172 }
5173 return false;
5174 }
5175
5176 // resume the thread
5177 // calling resume on an active thread is a no-op
5178 static void do_resume(HANDLE* h) {
5179 if (h != NULL) {
5180 ResumeThread(*h);
5181 }
5182 }
5183
5184 // retrieve a suspend/resume context capable handle
5185 // from the tid. Caller validates handle return value.
5186 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5187 if (h != NULL) {
5188 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5189 }
5190 }
5191
5192 //
5193 // Thread sampling implementation
5194 //
5195 void os::SuspendedThreadTask::internal_do_task() {
5196 CONTEXT ctxt;
5197 HANDLE h = NULL;
5198
5199 // get context capable handle for thread
5200 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5201
5202 // sanity
5203 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5204 return;
5205 }
5206
5207 // suspend the thread
5208 if (do_suspend(&h)) {
5209 ctxt.ContextFlags = sampling_context_flags;
5210 // get thread context
5211 GetThreadContext(h, &ctxt);
5212 SuspendedThreadTaskContext context(_thread, &ctxt);
5213 // pass context to Thread Sampling impl
5214 do_task(context);
5215 // resume thread
5216 do_resume(&h);
5217 }
5218
5219 // close handle
5220 CloseHandle(h);
5221 }
5222
5223
5224 // Kernel32 API
5225 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5226 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5227 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5228 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5229 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5230
5231 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5232 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5233 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5234 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5235 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5236
5237
5238 BOOL os::Kernel32Dll::initialized = FALSE;
5239 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5240 assert(initialized && _GetLargePageMinimum != NULL,
5241 "GetLargePageMinimumAvailable() not yet called");
5242 return _GetLargePageMinimum();
5243 }
5244
5245 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5246 if (!initialized) {
5247 initialize();
5248 }
5249 return _GetLargePageMinimum != NULL;
5250 }
5251
5252 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5253 if (!initialized) {
5254 initialize();
5255 }
5256 return _VirtualAllocExNuma != NULL;
5257 }
5258
5259 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5260 assert(initialized && _VirtualAllocExNuma != NULL,
5261 "NUMACallsAvailable() not yet called");
5262
5263 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5264 }
5265
5266 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5267 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5268 "NUMACallsAvailable() not yet called");
5269
5270 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5271 }
5272
5273 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5274 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5275 "NUMACallsAvailable() not yet called");
5276
5277 return _GetNumaNodeProcessorMask(node, proc_mask);
5278 }
5279
5280 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5281 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5282 if (!initialized) {
5283 initialize();
5284 }
5285
5286 if (_RtlCaptureStackBackTrace != NULL) {
5287 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5288 BackTrace, BackTraceHash);
5289 } else {
5290 return 0;
5291 }
5292 }
5293
5294 void os::Kernel32Dll::initializeCommon() {
5295 if (!initialized) {
5296 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5297 assert(handle != NULL, "Just check");
5298 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5299 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5300 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5301 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5302 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5303 initialized = TRUE;
5304 }
5305 }
5306
5307
5308
5309 #ifndef JDK6_OR_EARLIER
5310
5311 void os::Kernel32Dll::initialize() {
5312 initializeCommon();
5313 }
5314
5315
5316 // Kernel32 API
5317 inline BOOL os::Kernel32Dll::SwitchToThread() {
5318 return ::SwitchToThread();
5319 }
5320
5321 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5322 return true;
5323 }
5324
5325 // Help tools
5326 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5327 return true;
5328 }
5329
5330 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5331 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5332 }
5333
5334 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5335 return ::Module32First(hSnapshot, lpme);
5336 }
5337
5338 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5339 return ::Module32Next(hSnapshot, lpme);
5340 }
5341
5342
5343 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5344 return true;
5345 }
5346
5347 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5348 ::GetNativeSystemInfo(lpSystemInfo);
5349 }
5350
5351 // PSAPI API
5352 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5353 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5354 }
5355
5356 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5357 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5358 }
5359
5360 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5361 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5362 }
5363
5364 inline BOOL os::PSApiDll::PSApiAvailable() {
5365 return true;
5366 }
5367
5368
5369 // WinSock2 API
5370 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5371 return ::WSAStartup(wVersionRequested, lpWSAData);
5372 }
5373
5374 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5375 return ::gethostbyname(name);
5376 }
5377
5378 inline BOOL os::WinSock2Dll::WinSock2Available() {
5379 return true;
5380 }
5381
5382 // Advapi API
5383 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5384 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5385 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5386 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5387 BufferLength, PreviousState, ReturnLength);
5388 }
5389
5390 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5391 PHANDLE TokenHandle) {
5392 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5393 }
5394
5395 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5396 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5397 }
5398
5399 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5400 return true;
5401 }
5402
5403 void* os::get_default_process_handle() {
5404 return (void*)GetModuleHandle(NULL);
5405 }
5406
5407 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5408 // which is used to find statically linked in agents.
5409 // Additionally for windows, takes into account __stdcall names.
5410 // Parameters:
5411 // sym_name: Symbol in library we are looking for
5412 // lib_name: Name of library to look in, NULL for shared libs.
5413 // is_absolute_path == true if lib_name is absolute path to agent
5414 // such as "C:/a/b/L.dll"
5415 // == false if only the base name of the library is passed in
5416 // such as "L"
5417 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5418 bool is_absolute_path) {
5419 char *agent_entry_name;
5420 size_t len;
5421 size_t name_len;
5422 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5423 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5424 const char *start;
5425
5426 if (lib_name != NULL) {
5427 len = name_len = strlen(lib_name);
5428 if (is_absolute_path) {
5429 // Need to strip path, prefix and suffix
5430 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5431 lib_name = ++start;
5432 } else {
5433 // Need to check for drive prefix
5434 if ((start = strchr(lib_name, ':')) != NULL) {
5435 lib_name = ++start;
5436 }
5437 }
5438 if (len <= (prefix_len + suffix_len)) {
5439 return NULL;
5440 }
5441 lib_name += prefix_len;
5442 name_len = strlen(lib_name) - suffix_len;
5443 }
5444 }
5445 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5446 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5447 if (agent_entry_name == NULL) {
5448 return NULL;
5449 }
5450 if (lib_name != NULL) {
5451 const char *p = strrchr(sym_name, '@');
5452 if (p != NULL && p != sym_name) {
5453 // sym_name == _Agent_OnLoad@XX
5454 strncpy(agent_entry_name, sym_name, (p - sym_name));
5455 agent_entry_name[(p-sym_name)] = '\0';
5456 // agent_entry_name == _Agent_OnLoad
5457 strcat(agent_entry_name, "_");
5458 strncat(agent_entry_name, lib_name, name_len);
5459 strcat(agent_entry_name, p);
5460 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5461 } else {
5462 strcpy(agent_entry_name, sym_name);
5463 strcat(agent_entry_name, "_");
5464 strncat(agent_entry_name, lib_name, name_len);
5465 }
5466 } else {
5467 strcpy(agent_entry_name, sym_name);
5468 }
5469 return agent_entry_name;
5470 }
5471
5472 #else
5473 // Kernel32 API
5474 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5475 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5476 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5477 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5478 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5479
5480 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5481 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5482 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5483 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5484 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5485
5486 void os::Kernel32Dll::initialize() {
5487 if (!initialized) {
5488 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5489 assert(handle != NULL, "Just check");
5490
5491 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5492 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5493 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5494 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5495 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5496 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5497 initializeCommon(); // resolve the functions that always need resolving
5498
5499 initialized = TRUE;
5500 }
5501 }
5502
5503 BOOL os::Kernel32Dll::SwitchToThread() {
5504 assert(initialized && _SwitchToThread != NULL,
5505 "SwitchToThreadAvailable() not yet called");
5506 return _SwitchToThread();
5507 }
5508
5509
5510 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5511 if (!initialized) {
5512 initialize();
5513 }
5514 return _SwitchToThread != NULL;
5515 }
5516
5517 // Help tools
5518 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5519 if (!initialized) {
5520 initialize();
5521 }
5522 return _CreateToolhelp32Snapshot != NULL &&
5523 _Module32First != NULL &&
5524 _Module32Next != NULL;
5525 }
5526
5527 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5528 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5529 "HelpToolsAvailable() not yet called");
5530
5531 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5532 }
5533
5534 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5535 assert(initialized && _Module32First != NULL,
5536 "HelpToolsAvailable() not yet called");
5537
5538 return _Module32First(hSnapshot, lpme);
5539 }
5540
5541 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5542 assert(initialized && _Module32Next != NULL,
5543 "HelpToolsAvailable() not yet called");
5544
5545 return _Module32Next(hSnapshot, lpme);
5546 }
5547
5548
5549 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5550 if (!initialized) {
5551 initialize();
5552 }
5553 return _GetNativeSystemInfo != NULL;
5554 }
5555
5556 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5557 assert(initialized && _GetNativeSystemInfo != NULL,
5558 "GetNativeSystemInfoAvailable() not yet called");
5559
5560 _GetNativeSystemInfo(lpSystemInfo);
5561 }
5562
5563 // PSAPI API
5564
5565
5566 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5567 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5568 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5569
5570 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5571 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5572 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5573 BOOL os::PSApiDll::initialized = FALSE;
5574
5575 void os::PSApiDll::initialize() {
5576 if (!initialized) {
5577 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5578 if (handle != NULL) {
5579 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5580 "EnumProcessModules");
5581 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5582 "GetModuleFileNameExA");
5583 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5584 "GetModuleInformation");
5585 }
5586 initialized = TRUE;
5587 }
5588 }
5589
5590
5591
5592 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5593 assert(initialized && _EnumProcessModules != NULL,
5594 "PSApiAvailable() not yet called");
5595 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5596 }
5597
5598 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5599 assert(initialized && _GetModuleFileNameEx != NULL,
5600 "PSApiAvailable() not yet called");
5601 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5602 }
5603
5604 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5605 assert(initialized && _GetModuleInformation != NULL,
5606 "PSApiAvailable() not yet called");
5607 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5608 }
5609
5610 BOOL os::PSApiDll::PSApiAvailable() {
5611 if (!initialized) {
5612 initialize();
5613 }
5614 return _EnumProcessModules != NULL &&
5615 _GetModuleFileNameEx != NULL &&
5616 _GetModuleInformation != NULL;
5617 }
5618
5619
5620 // WinSock2 API
5621 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5622 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5623
5624 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5625 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5626 BOOL os::WinSock2Dll::initialized = FALSE;
5627
5628 void os::WinSock2Dll::initialize() {
5629 if (!initialized) {
5630 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5631 if (handle != NULL) {
5632 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5633 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5634 }
5635 initialized = TRUE;
5636 }
5637 }
5638
5639
5640 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5641 assert(initialized && _WSAStartup != NULL,
5642 "WinSock2Available() not yet called");
5643 return _WSAStartup(wVersionRequested, lpWSAData);
5644 }
5645
5646 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5647 assert(initialized && _gethostbyname != NULL,
5648 "WinSock2Available() not yet called");
5649 return _gethostbyname(name);
5650 }
5651
5652 BOOL os::WinSock2Dll::WinSock2Available() {
5653 if (!initialized) {
5654 initialize();
5655 }
5656 return _WSAStartup != NULL &&
5657 _gethostbyname != NULL;
5658 }
5659
5660 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5661 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5662 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5663
5664 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5665 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5666 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5667 BOOL os::Advapi32Dll::initialized = FALSE;
5668
5669 void os::Advapi32Dll::initialize() {
5670 if (!initialized) {
5671 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5672 if (handle != NULL) {
5673 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5674 "AdjustTokenPrivileges");
5675 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5676 "OpenProcessToken");
5677 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5678 "LookupPrivilegeValueA");
5679 }
5680 initialized = TRUE;
5681 }
5682 }
5683
5684 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5685 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5686 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5687 assert(initialized && _AdjustTokenPrivileges != NULL,
5688 "AdvapiAvailable() not yet called");
5689 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5690 BufferLength, PreviousState, ReturnLength);
5691 }
5692
5693 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5694 PHANDLE TokenHandle) {
5695 assert(initialized && _OpenProcessToken != NULL,
5696 "AdvapiAvailable() not yet called");
5697 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5698 }
5699
5700 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5701 assert(initialized && _LookupPrivilegeValue != NULL,
5702 "AdvapiAvailable() not yet called");
5703 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5704 }
5705
5706 BOOL os::Advapi32Dll::AdvapiAvailable() {
5707 if (!initialized) {
5708 initialize();
5709 }
5710 return _AdjustTokenPrivileges != NULL &&
5711 _OpenProcessToken != NULL &&
5712 _LookupPrivilegeValue != NULL;
5713 }
5714
5715 #endif
5716
5717 #ifndef PRODUCT
5718
5719 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5720 // contiguous memory block at a particular address.
5721 // The test first tries to find a good approximate address to allocate at by using the same
5722 // method to allocate some memory at any address. The test then tries to allocate memory in
5723 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5724 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5725 // the previously allocated memory is available for allocation. The only actual failure
5726 // that is reported is when the test tries to allocate at a particular location but gets a
5727 // different valid one. A NULL return value at this point is not considered an error but may
5728 // be legitimate.
5729 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5730 void TestReserveMemorySpecial_test() {
5731 if (!UseLargePages) {
5732 if (VerboseInternalVMTests) {
5733 gclog_or_tty->print("Skipping test because large pages are disabled");
5734 }
5735 return;
5736 }
5737 // save current value of globals
5738 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5739 bool old_use_numa_interleaving = UseNUMAInterleaving;
5740
5741 // set globals to make sure we hit the correct code path
5742 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5743
5744 // do an allocation at an address selected by the OS to get a good one.
5745 const size_t large_allocation_size = os::large_page_size() * 4;
5746 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5747 if (result == NULL) {
5748 if (VerboseInternalVMTests) {
5749 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5750 large_allocation_size);
5751 }
5752 } else {
5753 os::release_memory_special(result, large_allocation_size);
5754
5755 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5756 // we managed to get it once.
5757 const size_t expected_allocation_size = os::large_page_size();
5758 char* expected_location = result + os::large_page_size();
5759 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5760 if (actual_location == NULL) {
5761 if (VerboseInternalVMTests) {
5762 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5763 expected_location, large_allocation_size);
5764 }
5765 } else {
5766 // release memory
5767 os::release_memory_special(actual_location, expected_allocation_size);
5768 // only now check, after releasing any memory to avoid any leaks.
5769 assert(actual_location == expected_location,
5770 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5771 expected_location, expected_allocation_size, actual_location));
5772 }
5773 }
5774
5775 // restore globals
5776 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5777 UseNUMAInterleaving = old_use_numa_interleaving;
5778 }
5779 #endif // PRODUCT
5780