1 /*
2 * Copyright (c) 1997, 2014, 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/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
75
76
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
83
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
94
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
106
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
111
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #elif _M_AMD64
115 #define __CPU__ amd64
116 #else
117 #define __CPU__ i486
118 #endif
119
120 // save DLL module handle, used by GetModuleFileName
121
122 HINSTANCE vm_lib_handle;
123
124 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
125 switch (reason) {
126 case DLL_PROCESS_ATTACH:
127 vm_lib_handle = hinst;
128 if(ForceTimeHighResolution)
129 timeBeginPeriod(1L);
130 break;
131 case DLL_PROCESS_DETACH:
132 if(ForceTimeHighResolution)
133 timeEndPeriod(1L);
134
135 break;
136 default:
137 break;
138 }
139 return true;
140 }
141
142 static inline double fileTimeAsDouble(FILETIME* time) {
143 const double high = (double) ((unsigned int) ~0);
144 const double split = 10000000.0;
145 double result = (time->dwLowDateTime / split) +
146 time->dwHighDateTime * (high/split);
147 return result;
148 }
149
150 // Implementation of os
151
152 bool os::getenv(const char* name, char* buffer, int len) {
153 int result = GetEnvironmentVariable(name, buffer, len);
154 return result > 0 && result < len;
155 }
156
157 bool os::unsetenv(const char* name) {
158 assert(name != NULL, "Null pointer");
159 return (SetEnvironmentVariable(name, NULL) == TRUE);
160 }
161
162 // No setuid programs under Windows.
163 bool os::have_special_privileges() {
164 return false;
165 }
166
167
168 // This method is a periodic task to check for misbehaving JNI applications
169 // under CheckJNI, we can add any periodic checks here.
170 // For Windows at the moment does nothing
171 void os::run_periodic_checks() {
172 return;
173 }
174
175 #ifndef _WIN64
176 // previous UnhandledExceptionFilter, if there is one
177 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
178
179 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
180 #endif
181 void os::init_system_properties_values() {
182 /* sysclasspath, java_home, dll_dir */
183 {
184 char *home_path;
185 char *dll_path;
186 char *pslash;
187 char *bin = "\\bin";
188 char home_dir[MAX_PATH];
189
190 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
191 os::jvm_path(home_dir, sizeof(home_dir));
192 // Found the full path to jvm.dll.
193 // Now cut the path to <java_home>/jre if we can.
194 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
195 pslash = strrchr(home_dir, '\\');
196 if (pslash != NULL) {
197 *pslash = '\0'; /* get rid of \{client|server} */
198 pslash = strrchr(home_dir, '\\');
199 if (pslash != NULL)
200 *pslash = '\0'; /* get rid of \bin */
201 }
202 }
203
204 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
205 if (home_path == NULL)
206 return;
207 strcpy(home_path, home_dir);
208 Arguments::set_java_home(home_path);
209
210 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
211 if (dll_path == NULL)
212 return;
213 strcpy(dll_path, home_dir);
214 strcat(dll_path, bin);
215 Arguments::set_dll_dir(dll_path);
216
217 if (!set_boot_path('\\', ';'))
218 return;
219 }
220
221 /* library_path */
222 #define EXT_DIR "\\lib\\ext"
223 #define BIN_DIR "\\bin"
224 #define PACKAGE_DIR "\\Sun\\Java"
225 {
226 /* Win32 library search order (See the documentation for LoadLibrary):
227 *
228 * 1. The directory from which application is loaded.
229 * 2. The system wide Java Extensions directory (Java only)
230 * 3. System directory (GetSystemDirectory)
231 * 4. Windows directory (GetWindowsDirectory)
232 * 5. The PATH environment variable
233 * 6. The current directory
234 */
235
236 char *library_path;
237 char tmp[MAX_PATH];
238 char *path_str = ::getenv("PATH");
239
240 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
241 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
242
243 library_path[0] = '\0';
244
245 GetModuleFileName(NULL, tmp, sizeof(tmp));
246 *(strrchr(tmp, '\\')) = '\0';
247 strcat(library_path, tmp);
248
249 GetWindowsDirectory(tmp, sizeof(tmp));
250 strcat(library_path, ";");
251 strcat(library_path, tmp);
252 strcat(library_path, PACKAGE_DIR BIN_DIR);
253
254 GetSystemDirectory(tmp, sizeof(tmp));
255 strcat(library_path, ";");
256 strcat(library_path, tmp);
257
258 GetWindowsDirectory(tmp, sizeof(tmp));
259 strcat(library_path, ";");
260 strcat(library_path, tmp);
261
262 if (path_str) {
263 strcat(library_path, ";");
264 strcat(library_path, path_str);
265 }
266
267 strcat(library_path, ";.");
268
269 Arguments::set_library_path(library_path);
270 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
271 }
272
273 /* Default extensions directory */
274 {
275 char path[MAX_PATH];
276 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
277 GetWindowsDirectory(path, MAX_PATH);
278 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
279 path, PACKAGE_DIR, EXT_DIR);
280 Arguments::set_ext_dirs(buf);
281 }
282 #undef EXT_DIR
283 #undef BIN_DIR
284 #undef PACKAGE_DIR
285
286 /* Default endorsed standards directory. */
287 {
288 #define ENDORSED_DIR "\\lib\\endorsed"
289 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
290 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
291 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
292 Arguments::set_endorsed_dirs(buf);
293 #undef ENDORSED_DIR
294 }
295
296 #ifndef _WIN64
297 // set our UnhandledExceptionFilter and save any previous one
298 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
299 #endif
300
301 // Done
302 return;
303 }
304
305 void os::breakpoint() {
306 DebugBreak();
307 }
308
309 // Invoked from the BREAKPOINT Macro
310 extern "C" void breakpoint() {
311 os::breakpoint();
312 }
313
314 /*
315 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 * So far, this method is only used by Native Memory Tracking, which is
317 * only supported on Windows XP or later.
318 */
319
320 int os::get_native_stack(address* stack, int frames, int toSkip) {
321 #ifdef _NMT_NOINLINE_
322 toSkip ++;
323 #endif
324 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
325 (PVOID*)stack, NULL);
326 for (int index = captured; index < frames; index ++) {
327 stack[index] = NULL;
328 }
329 return captured;
330 }
331
332
333 // os::current_stack_base()
334 //
335 // Returns the base of the stack, which is the stack's
336 // starting address. This function must be called
337 // while running on the stack of the thread being queried.
338
339 address os::current_stack_base() {
340 MEMORY_BASIC_INFORMATION minfo;
341 address stack_bottom;
342 size_t stack_size;
343
344 VirtualQuery(&minfo, &minfo, sizeof(minfo));
345 stack_bottom = (address)minfo.AllocationBase;
346 stack_size = minfo.RegionSize;
347
348 // Add up the sizes of all the regions with the same
349 // AllocationBase.
350 while( 1 )
351 {
352 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
353 if ( stack_bottom == (address)minfo.AllocationBase )
354 stack_size += minfo.RegionSize;
355 else
356 break;
357 }
358
359 #ifdef _M_IA64
360 // IA64 has memory and register stacks
361 //
362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
363 // at thread creation (1MB backing store growing upwards, 1MB memory stack
364 // growing downwards, 2MB summed up)
365 //
366 // ...
367 // ------- top of stack (high address) -----
368 // |
369 // | 1MB
370 // | Backing Store (Register Stack)
371 // |
372 // | / \
373 // | |
374 // | |
375 // | |
376 // ------------------------ stack base -----
377 // | 1MB
378 // | Memory Stack
379 // |
380 // | |
381 // | |
382 // | |
383 // | \ /
384 // |
385 // ----- bottom of stack (low address) -----
386 // ...
387
388 stack_size = stack_size / 2;
389 #endif
390 return stack_bottom + stack_size;
391 }
392
393 size_t os::current_stack_size() {
394 size_t sz;
395 MEMORY_BASIC_INFORMATION minfo;
396 VirtualQuery(&minfo, &minfo, sizeof(minfo));
397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
398 return sz;
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
411
412 // Thread start routine for all new Java threads
413 static unsigned __stdcall java_start(Thread* thread) {
414 // Try to randomize the cache line index of hot stack frames.
415 // This helps when threads of the same stack traces evict each other's
416 // cache lines. The threads can be either from the same JVM instance, or
417 // from different JVM instances. The benefit is especially true for
418 // processors with hyperthreading technology.
419 static int counter = 0;
420 int pid = os::current_process_id();
421 _alloca(((pid ^ counter++) & 7) * 128);
422
423 OSThread* osthr = thread->osthread();
424 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
425
426 if (UseNUMA) {
427 int lgrp_id = os::numa_get_group_id();
428 if (lgrp_id != -1) {
429 thread->set_lgrp_id(lgrp_id);
430 }
431 }
432
433
434 // Install a win32 structured exception handler around every thread created
435 // by VM, so VM can genrate error dump when an exception occurred in non-
436 // Java thread (e.g. VM thread).
437 __try {
438 thread->run();
439 } __except(topLevelExceptionFilter(
440 (_EXCEPTION_POINTERS*)_exception_info())) {
441 // Nothing to do.
442 }
443
444 // One less thread is executing
445 // When the VMThread gets here, the main thread may have already exited
446 // which frees the CodeHeap containing the Atomic::add code
447 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
448 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
449 }
450
451 return 0;
452 }
453
454 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
455 // Allocate the OSThread object
456 OSThread* osthread = new OSThread(NULL, NULL);
457 if (osthread == NULL) return NULL;
458
459 // Initialize support for Java interrupts
460 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
461 if (interrupt_event == NULL) {
462 delete osthread;
463 return NULL;
464 }
465 osthread->set_interrupt_event(interrupt_event);
466
467 // Store info on the Win32 thread into the OSThread
468 osthread->set_thread_handle(thread_handle);
469 osthread->set_thread_id(thread_id);
470
471 if (UseNUMA) {
472 int lgrp_id = os::numa_get_group_id();
473 if (lgrp_id != -1) {
474 thread->set_lgrp_id(lgrp_id);
475 }
476 }
477
478 // Initial thread state is INITIALIZED, not SUSPENDED
479 osthread->set_state(INITIALIZED);
480
481 return osthread;
482 }
483
484
485 bool os::create_attached_thread(JavaThread* thread) {
486 #ifdef ASSERT
487 thread->verify_not_published();
488 #endif
489 HANDLE thread_h;
490 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
491 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
492 fatal("DuplicateHandle failed\n");
493 }
494 OSThread* osthread = create_os_thread(thread, thread_h,
495 (int)current_thread_id());
496 if (osthread == NULL) {
497 return false;
498 }
499
500 // Initial thread state is RUNNABLE
501 osthread->set_state(RUNNABLE);
502
503 thread->set_osthread(osthread);
504 return true;
505 }
506
507 bool os::create_main_thread(JavaThread* thread) {
508 #ifdef ASSERT
509 thread->verify_not_published();
510 #endif
511 if (_starting_thread == NULL) {
512 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
513 if (_starting_thread == NULL) {
514 return false;
515 }
516 }
517
518 // The primordial thread is runnable from the start)
519 _starting_thread->set_state(RUNNABLE);
520
521 thread->set_osthread(_starting_thread);
522 return true;
523 }
524
525 // Allocate and initialize a new OSThread
526 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
527 unsigned thread_id;
528
529 // Allocate the OSThread object
530 OSThread* osthread = new OSThread(NULL, NULL);
531 if (osthread == NULL) {
532 return false;
533 }
534
535 // Initialize support for Java interrupts
536 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
537 if (interrupt_event == NULL) {
538 delete osthread;
539 return NULL;
540 }
541 osthread->set_interrupt_event(interrupt_event);
542 osthread->set_interrupted(false);
543
544 thread->set_osthread(osthread);
545
546 if (stack_size == 0) {
547 switch (thr_type) {
548 case os::java_thread:
549 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
550 if (JavaThread::stack_size_at_create() > 0)
551 stack_size = JavaThread::stack_size_at_create();
552 break;
553 case os::compiler_thread:
554 if (CompilerThreadStackSize > 0) {
555 stack_size = (size_t)(CompilerThreadStackSize * K);
556 break;
557 } // else fall through:
558 // use VMThreadStackSize if CompilerThreadStackSize is not defined
559 case os::vm_thread:
560 case os::pgc_thread:
561 case os::cgc_thread:
562 case os::watcher_thread:
563 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
564 break;
565 }
566 }
567
568 // Create the Win32 thread
569 //
570 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
571 // does not specify stack size. Instead, it specifies the size of
572 // initially committed space. The stack size is determined by
573 // PE header in the executable. If the committed "stack_size" is larger
574 // than default value in the PE header, the stack is rounded up to the
575 // nearest multiple of 1MB. For example if the launcher has default
576 // stack size of 320k, specifying any size less than 320k does not
577 // affect the actual stack size at all, it only affects the initial
578 // commitment. On the other hand, specifying 'stack_size' larger than
579 // default value may cause significant increase in memory usage, because
580 // not only the stack space will be rounded up to MB, but also the
581 // entire space is committed upfront.
582 //
583 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
584 // for CreateThread() that can treat 'stack_size' as stack size. However we
585 // are not supposed to call CreateThread() directly according to MSDN
586 // document because JVM uses C runtime library. The good news is that the
587 // flag appears to work with _beginthredex() as well.
588
589 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
590 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
591 #endif
592
593 HANDLE thread_handle =
594 (HANDLE)_beginthreadex(NULL,
595 (unsigned)stack_size,
596 (unsigned (__stdcall *)(void*)) java_start,
597 thread,
598 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
599 &thread_id);
600 if (thread_handle == NULL) {
601 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
602 // without the flag.
603 thread_handle =
604 (HANDLE)_beginthreadex(NULL,
605 (unsigned)stack_size,
606 (unsigned (__stdcall *)(void*)) java_start,
607 thread,
608 CREATE_SUSPENDED,
609 &thread_id);
610 }
611 if (thread_handle == NULL) {
612 // Need to clean up stuff we've allocated so far
613 CloseHandle(osthread->interrupt_event());
614 thread->set_osthread(NULL);
615 delete osthread;
616 return NULL;
617 }
618
619 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
620
621 // Store info on the Win32 thread into the OSThread
622 osthread->set_thread_handle(thread_handle);
623 osthread->set_thread_id(thread_id);
624
625 // Initial thread state is INITIALIZED, not SUSPENDED
626 osthread->set_state(INITIALIZED);
627
628 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
629 return true;
630 }
631
632
633 // Free Win32 resources related to the OSThread
634 void os::free_thread(OSThread* osthread) {
635 assert(osthread != NULL, "osthread not set");
636 CloseHandle(osthread->thread_handle());
637 CloseHandle(osthread->interrupt_event());
638 delete osthread;
639 }
640
641
642 static int has_performance_count = 0;
643 static jlong first_filetime;
644 static jlong initial_performance_count;
645 static jlong performance_frequency;
646
647
648 jlong as_long(LARGE_INTEGER x) {
649 jlong result = 0; // initialization to avoid warning
650 set_high(&result, x.HighPart);
651 set_low(&result, x.LowPart);
652 return result;
653 }
654
655
656 jlong os::elapsed_counter() {
657 LARGE_INTEGER count;
658 if (has_performance_count) {
659 QueryPerformanceCounter(&count);
660 return as_long(count) - initial_performance_count;
661 } else {
662 FILETIME wt;
663 GetSystemTimeAsFileTime(&wt);
664 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
665 }
666 }
667
668
669 jlong os::elapsed_frequency() {
670 if (has_performance_count) {
671 return performance_frequency;
672 } else {
673 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
674 return 10000000;
675 }
676 }
677
678
679 julong os::available_memory() {
680 return win32::available_memory();
681 }
682
683 julong os::win32::available_memory() {
684 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
685 // value if total memory is larger than 4GB
686 MEMORYSTATUSEX ms;
687 ms.dwLength = sizeof(ms);
688 GlobalMemoryStatusEx(&ms);
689
690 return (julong)ms.ullAvailPhys;
691 }
692
693 julong os::physical_memory() {
694 return win32::physical_memory();
695 }
696
697 bool os::has_allocatable_memory_limit(julong* limit) {
698 MEMORYSTATUSEX ms;
699 ms.dwLength = sizeof(ms);
700 GlobalMemoryStatusEx(&ms);
701 #ifdef _LP64
702 *limit = (julong)ms.ullAvailVirtual;
703 return true;
704 #else
705 // Limit to 1400m because of the 2gb address space wall
706 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
707 return true;
708 #endif
709 }
710
711 // VC6 lacks DWORD_PTR
712 #if _MSC_VER < 1300
713 typedef UINT_PTR DWORD_PTR;
714 #endif
715
716 int os::active_processor_count() {
717 DWORD_PTR lpProcessAffinityMask = 0;
718 DWORD_PTR lpSystemAffinityMask = 0;
719 int proc_count = processor_count();
720 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
721 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
722 // Nof active processors is number of bits in process affinity mask
723 int bitcount = 0;
724 while (lpProcessAffinityMask != 0) {
725 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
726 bitcount++;
727 }
728 return bitcount;
729 } else {
730 return proc_count;
731 }
732 }
733
734 void os::set_native_thread_name(const char *name) {
735 // Not yet implemented.
736 return;
737 }
738
739 bool os::distribute_processes(uint length, uint* distribution) {
740 // Not yet implemented.
741 return false;
742 }
743
744 bool os::bind_to_processor(uint processor_id) {
745 // Not yet implemented.
746 return false;
747 }
748
749 static void initialize_performance_counter() {
750 LARGE_INTEGER count;
751 if (QueryPerformanceFrequency(&count)) {
752 has_performance_count = 1;
753 performance_frequency = as_long(count);
754 QueryPerformanceCounter(&count);
755 initial_performance_count = as_long(count);
756 } else {
757 has_performance_count = 0;
758 FILETIME wt;
759 GetSystemTimeAsFileTime(&wt);
760 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
761 }
762 }
763
764
765 double os::elapsedTime() {
766 return (double) elapsed_counter() / (double) elapsed_frequency();
767 }
768
769
770 // Windows format:
771 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
772 // Java format:
773 // Java standards require the number of milliseconds since 1/1/1970
774
775 // Constant offset - calculated using offset()
776 static jlong _offset = 116444736000000000;
777 // Fake time counter for reproducible results when debugging
778 static jlong fake_time = 0;
779
780 #ifdef ASSERT
781 // Just to be safe, recalculate the offset in debug mode
782 static jlong _calculated_offset = 0;
783 static int _has_calculated_offset = 0;
784
785 jlong offset() {
786 if (_has_calculated_offset) return _calculated_offset;
787 SYSTEMTIME java_origin;
788 java_origin.wYear = 1970;
789 java_origin.wMonth = 1;
790 java_origin.wDayOfWeek = 0; // ignored
791 java_origin.wDay = 1;
792 java_origin.wHour = 0;
793 java_origin.wMinute = 0;
794 java_origin.wSecond = 0;
795 java_origin.wMilliseconds = 0;
796 FILETIME jot;
797 if (!SystemTimeToFileTime(&java_origin, &jot)) {
798 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
799 }
800 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
801 _has_calculated_offset = 1;
802 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
803 return _calculated_offset;
804 }
805 #else
806 jlong offset() {
807 return _offset;
808 }
809 #endif
810
811 jlong windows_to_java_time(FILETIME wt) {
812 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
813 return (a - offset()) / 10000;
814 }
815
816 FILETIME java_to_windows_time(jlong l) {
817 jlong a = (l * 10000) + offset();
818 FILETIME result;
819 result.dwHighDateTime = high(a);
820 result.dwLowDateTime = low(a);
821 return result;
822 }
823
824 bool os::supports_vtime() { return true; }
825 bool os::enable_vtime() { return false; }
826 bool os::vtime_enabled() { return false; }
827
828 double os::elapsedVTime() {
829 FILETIME created;
830 FILETIME exited;
831 FILETIME kernel;
832 FILETIME user;
833 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
834 // the resolution of windows_to_java_time() should be sufficient (ms)
835 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
836 } else {
837 return elapsedTime();
838 }
839 }
840
841 jlong os::javaTimeMillis() {
842 if (UseFakeTimers) {
843 return fake_time++;
844 } else {
845 FILETIME wt;
846 GetSystemTimeAsFileTime(&wt);
847 return windows_to_java_time(wt);
848 }
849 }
850
851 jlong os::javaTimeNanos() {
852 if (!has_performance_count) {
853 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
854 } else {
855 LARGE_INTEGER current_count;
856 QueryPerformanceCounter(¤t_count);
857 double current = as_long(current_count);
858 double freq = performance_frequency;
859 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
860 return time;
861 }
862 }
863
864 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
865 if (!has_performance_count) {
866 // javaTimeMillis() doesn't have much percision,
867 // but it is not going to wrap -- so all 64 bits
868 info_ptr->max_value = ALL_64_BITS;
869
870 // this is a wall clock timer, so may skip
871 info_ptr->may_skip_backward = true;
872 info_ptr->may_skip_forward = true;
873 } else {
874 jlong freq = performance_frequency;
875 if (freq < NANOSECS_PER_SEC) {
876 // the performance counter is 64 bits and we will
877 // be multiplying it -- so no wrap in 64 bits
878 info_ptr->max_value = ALL_64_BITS;
879 } else if (freq > NANOSECS_PER_SEC) {
880 // use the max value the counter can reach to
881 // determine the max value which could be returned
882 julong max_counter = (julong)ALL_64_BITS;
883 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
884 } else {
885 // the performance counter is 64 bits and we will
886 // be using it directly -- so no wrap in 64 bits
887 info_ptr->max_value = ALL_64_BITS;
888 }
889
890 // using a counter, so no skipping
891 info_ptr->may_skip_backward = false;
892 info_ptr->may_skip_forward = false;
893 }
894 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
895 }
896
897 char* os::local_time_string(char *buf, size_t buflen) {
898 SYSTEMTIME st;
899 GetLocalTime(&st);
900 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
901 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
902 return buf;
903 }
904
905 bool os::getTimesSecs(double* process_real_time,
906 double* process_user_time,
907 double* process_system_time) {
908 HANDLE h_process = GetCurrentProcess();
909 FILETIME create_time, exit_time, kernel_time, user_time;
910 BOOL result = GetProcessTimes(h_process,
911 &create_time,
912 &exit_time,
913 &kernel_time,
914 &user_time);
915 if (result != 0) {
916 FILETIME wt;
917 GetSystemTimeAsFileTime(&wt);
918 jlong rtc_millis = windows_to_java_time(wt);
919 jlong user_millis = windows_to_java_time(user_time);
920 jlong system_millis = windows_to_java_time(kernel_time);
921 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
922 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
923 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
924 return true;
925 } else {
926 return false;
927 }
928 }
929
930 void os::shutdown() {
931
932 // allow PerfMemory to attempt cleanup of any persistent resources
933 perfMemory_exit();
934
935 // flush buffered output, finish log files
936 ostream_abort();
937
938 // Check for abort hook
939 abort_hook_t abort_hook = Arguments::abort_hook();
940 if (abort_hook != NULL) {
941 abort_hook();
942 }
943 }
944
945
946 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
947 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
948
949 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
950 HINSTANCE dbghelp;
951 EXCEPTION_POINTERS ep;
952 MINIDUMP_EXCEPTION_INFORMATION mei;
953 MINIDUMP_EXCEPTION_INFORMATION* pmei;
954
955 HANDLE hProcess = GetCurrentProcess();
956 DWORD processId = GetCurrentProcessId();
957 HANDLE dumpFile;
958 MINIDUMP_TYPE dumpType;
959 static const char* cwd;
960
961 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
962 #ifndef ASSERT
963 // If running on a client version of Windows and user has not explicitly enabled dumping
964 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
965 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
966 return;
967 // If running on a server version of Windows and user has explictly disabled dumping
968 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
969 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
970 return;
971 }
972 #else
973 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
974 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
975 return;
976 }
977 #endif
978
979 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
980
981 if (dbghelp == NULL) {
982 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
983 return;
984 }
985
986 _MiniDumpWriteDump = CAST_TO_FN_PTR(
987 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
988 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
989 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
990
991 if (_MiniDumpWriteDump == NULL) {
992 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
993 return;
994 }
995
996 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
997
998 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
999 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1000 #if API_VERSION_NUMBER >= 11
1001 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1002 MiniDumpWithUnloadedModules);
1003 #endif
1004
1005 cwd = get_current_directory(NULL, 0);
1006 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1007 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1008
1009 if (dumpFile == INVALID_HANDLE_VALUE) {
1010 VMError::report_coredump_status("Failed to create file for dumping", false);
1011 return;
1012 }
1013 if (exceptionRecord != NULL && contextRecord != NULL) {
1014 ep.ContextRecord = (PCONTEXT) contextRecord;
1015 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1016
1017 mei.ThreadId = GetCurrentThreadId();
1018 mei.ExceptionPointers = &ep;
1019 pmei = &mei;
1020 } else {
1021 pmei = NULL;
1022 }
1023
1024
1025 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1026 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1027 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1028 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1029 DWORD error = GetLastError();
1030 LPTSTR msgbuf = NULL;
1031
1032 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1033 FORMAT_MESSAGE_FROM_SYSTEM |
1034 FORMAT_MESSAGE_IGNORE_INSERTS,
1035 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1036
1037 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1038 LocalFree(msgbuf);
1039 } else {
1040 // Call to FormatMessage failed, just include the result from GetLastError
1041 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1042 }
1043 VMError::report_coredump_status(buffer, false);
1044 } else {
1045 VMError::report_coredump_status(buffer, true);
1046 }
1047
1048 CloseHandle(dumpFile);
1049 }
1050
1051
1052
1053 void os::abort(bool dump_core)
1054 {
1055 os::shutdown();
1056 // no core dump on Windows
1057 ::exit(1);
1058 }
1059
1060 // Die immediately, no exit hook, no abort hook, no cleanup.
1061 void os::die() {
1062 _exit(-1);
1063 }
1064
1065 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1066 // * dirent_md.c 1.15 00/02/02
1067 //
1068 // The declarations for DIR and struct dirent are in jvm_win32.h.
1069
1070 /* Caller must have already run dirname through JVM_NativePath, which removes
1071 duplicate slashes and converts all instances of '/' into '\\'. */
1072
1073 DIR *
1074 os::opendir(const char *dirname)
1075 {
1076 assert(dirname != NULL, "just checking"); // hotspot change
1077 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1078 DWORD fattr; // hotspot change
1079 char alt_dirname[4] = { 0, 0, 0, 0 };
1080
1081 if (dirp == 0) {
1082 errno = ENOMEM;
1083 return 0;
1084 }
1085
1086 /*
1087 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1088 * as a directory in FindFirstFile(). We detect this case here and
1089 * prepend the current drive name.
1090 */
1091 if (dirname[1] == '\0' && dirname[0] == '\\') {
1092 alt_dirname[0] = _getdrive() + 'A' - 1;
1093 alt_dirname[1] = ':';
1094 alt_dirname[2] = '\\';
1095 alt_dirname[3] = '\0';
1096 dirname = alt_dirname;
1097 }
1098
1099 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1100 if (dirp->path == 0) {
1101 free(dirp, mtInternal);
1102 errno = ENOMEM;
1103 return 0;
1104 }
1105 strcpy(dirp->path, dirname);
1106
1107 fattr = GetFileAttributes(dirp->path);
1108 if (fattr == 0xffffffff) {
1109 free(dirp->path, mtInternal);
1110 free(dirp, mtInternal);
1111 errno = ENOENT;
1112 return 0;
1113 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1114 free(dirp->path, mtInternal);
1115 free(dirp, mtInternal);
1116 errno = ENOTDIR;
1117 return 0;
1118 }
1119
1120 /* Append "*.*", or possibly "\\*.*", to path */
1121 if (dirp->path[1] == ':'
1122 && (dirp->path[2] == '\0'
1123 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1124 /* No '\\' needed for cases like "Z:" or "Z:\" */
1125 strcat(dirp->path, "*.*");
1126 } else {
1127 strcat(dirp->path, "\\*.*");
1128 }
1129
1130 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1131 if (dirp->handle == INVALID_HANDLE_VALUE) {
1132 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1133 free(dirp->path, mtInternal);
1134 free(dirp, mtInternal);
1135 errno = EACCES;
1136 return 0;
1137 }
1138 }
1139 return dirp;
1140 }
1141
1142 /* parameter dbuf unused on Windows */
1143
1144 struct dirent *
1145 os::readdir(DIR *dirp, dirent *dbuf)
1146 {
1147 assert(dirp != NULL, "just checking"); // hotspot change
1148 if (dirp->handle == INVALID_HANDLE_VALUE) {
1149 return 0;
1150 }
1151
1152 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1153
1154 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1155 if (GetLastError() == ERROR_INVALID_HANDLE) {
1156 errno = EBADF;
1157 return 0;
1158 }
1159 FindClose(dirp->handle);
1160 dirp->handle = INVALID_HANDLE_VALUE;
1161 }
1162
1163 return &dirp->dirent;
1164 }
1165
1166 int
1167 os::closedir(DIR *dirp)
1168 {
1169 assert(dirp != NULL, "just checking"); // hotspot change
1170 if (dirp->handle != INVALID_HANDLE_VALUE) {
1171 if (!FindClose(dirp->handle)) {
1172 errno = EBADF;
1173 return -1;
1174 }
1175 dirp->handle = INVALID_HANDLE_VALUE;
1176 }
1177 free(dirp->path, mtInternal);
1178 free(dirp, mtInternal);
1179 return 0;
1180 }
1181
1182 // This must be hard coded because it's the system's temporary
1183 // directory not the java application's temp directory, ala java.io.tmpdir.
1184 const char* os::get_temp_directory() {
1185 static char path_buf[MAX_PATH];
1186 if (GetTempPath(MAX_PATH, path_buf)>0)
1187 return path_buf;
1188 else{
1189 path_buf[0]='\0';
1190 return path_buf;
1191 }
1192 }
1193
1194 static bool file_exists(const char* filename) {
1195 if (filename == NULL || strlen(filename) == 0) {
1196 return false;
1197 }
1198 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1199 }
1200
1201 bool os::dll_build_name(char *buffer, size_t buflen,
1202 const char* pname, const char* fname) {
1203 bool retval = false;
1204 const size_t pnamelen = pname ? strlen(pname) : 0;
1205 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1206
1207 // Return error on buffer overflow.
1208 if (pnamelen + strlen(fname) + 10 > buflen) {
1209 return retval;
1210 }
1211
1212 if (pnamelen == 0) {
1213 jio_snprintf(buffer, buflen, "%s.dll", fname);
1214 retval = true;
1215 } else if (c == ':' || c == '\\') {
1216 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1217 retval = true;
1218 } else if (strchr(pname, *os::path_separator()) != NULL) {
1219 int n;
1220 char** pelements = split_path(pname, &n);
1221 if (pelements == NULL) {
1222 return false;
1223 }
1224 for (int i = 0 ; i < n ; i++) {
1225 char* path = pelements[i];
1226 // Really shouldn't be NULL, but check can't hurt
1227 size_t plen = (path == NULL) ? 0 : strlen(path);
1228 if (plen == 0) {
1229 continue; // skip the empty path values
1230 }
1231 const char lastchar = path[plen - 1];
1232 if (lastchar == ':' || lastchar == '\\') {
1233 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1234 } else {
1235 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1236 }
1237 if (file_exists(buffer)) {
1238 retval = true;
1239 break;
1240 }
1241 }
1242 // release the storage
1243 for (int i = 0 ; i < n ; i++) {
1244 if (pelements[i] != NULL) {
1245 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1246 }
1247 }
1248 if (pelements != NULL) {
1249 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1250 }
1251 } else {
1252 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1253 retval = true;
1254 }
1255 return retval;
1256 }
1257
1258 // Needs to be in os specific directory because windows requires another
1259 // header file <direct.h>
1260 const char* os::get_current_directory(char *buf, size_t buflen) {
1261 int n = static_cast<int>(buflen);
1262 if (buflen > INT_MAX) n = INT_MAX;
1263 return _getcwd(buf, n);
1264 }
1265
1266 //-----------------------------------------------------------
1267 // Helper functions for fatal error handler
1268 #ifdef _WIN64
1269 // Helper routine which returns true if address in
1270 // within the NTDLL address space.
1271 //
1272 static bool _addr_in_ntdll( address addr )
1273 {
1274 HMODULE hmod;
1275 MODULEINFO minfo;
1276
1277 hmod = GetModuleHandle("NTDLL.DLL");
1278 if ( hmod == NULL ) return false;
1279 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1280 &minfo, sizeof(MODULEINFO)) )
1281 return false;
1282
1283 if ( (addr >= minfo.lpBaseOfDll) &&
1284 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1285 return true;
1286 else
1287 return false;
1288 }
1289 #endif
1290
1291
1292 // Enumerate all modules for a given process ID
1293 //
1294 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1295 // different API for doing this. We use PSAPI.DLL on NT based
1296 // Windows and ToolHelp on 95/98/Me.
1297
1298 // Callback function that is called by enumerate_modules() on
1299 // every DLL module.
1300 // Input parameters:
1301 // int pid,
1302 // char* module_file_name,
1303 // address module_base_addr,
1304 // unsigned module_size,
1305 // void* param
1306 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1307
1308 // enumerate_modules for Windows NT, using PSAPI
1309 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1310 {
1311 HANDLE hProcess ;
1312
1313 # define MAX_NUM_MODULES 128
1314 HMODULE modules[MAX_NUM_MODULES];
1315 static char filename[ MAX_PATH ];
1316 int result = 0;
1317
1318 if (!os::PSApiDll::PSApiAvailable()) {
1319 return 0;
1320 }
1321
1322 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1323 FALSE, pid ) ;
1324 if (hProcess == NULL) return 0;
1325
1326 DWORD size_needed;
1327 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1328 sizeof(modules), &size_needed)) {
1329 CloseHandle( hProcess );
1330 return 0;
1331 }
1332
1333 // number of modules that are currently loaded
1334 int num_modules = size_needed / sizeof(HMODULE);
1335
1336 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1337 // Get Full pathname:
1338 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1339 filename, sizeof(filename))) {
1340 filename[0] = '\0';
1341 }
1342
1343 MODULEINFO modinfo;
1344 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1345 &modinfo, sizeof(modinfo))) {
1346 modinfo.lpBaseOfDll = NULL;
1347 modinfo.SizeOfImage = 0;
1348 }
1349
1350 // Invoke callback function
1351 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1352 modinfo.SizeOfImage, param);
1353 if (result) break;
1354 }
1355
1356 CloseHandle( hProcess ) ;
1357 return result;
1358 }
1359
1360
1361 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1362 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1363 {
1364 HANDLE hSnapShot ;
1365 static MODULEENTRY32 modentry ;
1366 int result = 0;
1367
1368 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1369 return 0;
1370 }
1371
1372 // Get a handle to a Toolhelp snapshot of the system
1373 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1374 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1375 return FALSE ;
1376 }
1377
1378 // iterate through all modules
1379 modentry.dwSize = sizeof(MODULEENTRY32) ;
1380 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1381
1382 while( not_done ) {
1383 // invoke the callback
1384 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1385 modentry.modBaseSize, param);
1386 if (result) break;
1387
1388 modentry.dwSize = sizeof(MODULEENTRY32) ;
1389 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1390 }
1391
1392 CloseHandle(hSnapShot);
1393 return result;
1394 }
1395
1396 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1397 {
1398 // Get current process ID if caller doesn't provide it.
1399 if (!pid) pid = os::current_process_id();
1400
1401 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1402 else return _enumerate_modules_windows(pid, func, param);
1403 }
1404
1405 struct _modinfo {
1406 address addr;
1407 char* full_path; // point to a char buffer
1408 int buflen; // size of the buffer
1409 address base_addr;
1410 };
1411
1412 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1413 unsigned size, void * param) {
1414 struct _modinfo *pmod = (struct _modinfo *)param;
1415 if (!pmod) return -1;
1416
1417 if (base_addr <= pmod->addr &&
1418 base_addr+size > pmod->addr) {
1419 // if a buffer is provided, copy path name to the buffer
1420 if (pmod->full_path) {
1421 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1422 }
1423 pmod->base_addr = base_addr;
1424 return 1;
1425 }
1426 return 0;
1427 }
1428
1429 bool os::dll_address_to_library_name(address addr, char* buf,
1430 int buflen, int* offset) {
1431 // buf is not optional, but offset is optional
1432 assert(buf != NULL, "sanity check");
1433
1434 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1435 // return the full path to the DLL file, sometimes it returns path
1436 // to the corresponding PDB file (debug info); sometimes it only
1437 // returns partial path, which makes life painful.
1438
1439 struct _modinfo mi;
1440 mi.addr = addr;
1441 mi.full_path = buf;
1442 mi.buflen = buflen;
1443 int pid = os::current_process_id();
1444 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1445 // buf already contains path name
1446 if (offset) *offset = addr - mi.base_addr;
1447 return true;
1448 }
1449
1450 buf[0] = '\0';
1451 if (offset) *offset = -1;
1452 return false;
1453 }
1454
1455 bool os::dll_address_to_function_name(address addr, char *buf,
1456 int buflen, int *offset) {
1457 // buf is not optional, but offset is optional
1458 assert(buf != NULL, "sanity check");
1459
1460 if (Decoder::decode(addr, buf, buflen, offset)) {
1461 return true;
1462 }
1463 if (offset != NULL) *offset = -1;
1464 buf[0] = '\0';
1465 return false;
1466 }
1467
1468 // save the start and end address of jvm.dll into param[0] and param[1]
1469 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1470 unsigned size, void * param) {
1471 if (!param) return -1;
1472
1473 if (base_addr <= (address)_locate_jvm_dll &&
1474 base_addr+size > (address)_locate_jvm_dll) {
1475 ((address*)param)[0] = base_addr;
1476 ((address*)param)[1] = base_addr + size;
1477 return 1;
1478 }
1479 return 0;
1480 }
1481
1482 address vm_lib_location[2]; // start and end address of jvm.dll
1483
1484 // check if addr is inside jvm.dll
1485 bool os::address_is_in_vm(address addr) {
1486 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1487 int pid = os::current_process_id();
1488 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1489 assert(false, "Can't find jvm module.");
1490 return false;
1491 }
1492 }
1493
1494 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1495 }
1496
1497 // print module info; param is outputStream*
1498 static int _print_module(int pid, char* fname, address base,
1499 unsigned size, void* param) {
1500 if (!param) return -1;
1501
1502 outputStream* st = (outputStream*)param;
1503
1504 address end_addr = base + size;
1505 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1506 return 0;
1507 }
1508
1509 // Loads .dll/.so and
1510 // in case of error it checks if .dll/.so was built for the
1511 // same architecture as Hotspot is running on
1512 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1513 {
1514 void * result = LoadLibrary(name);
1515 if (result != NULL)
1516 {
1517 return result;
1518 }
1519
1520 DWORD errcode = GetLastError();
1521 if (errcode == ERROR_MOD_NOT_FOUND) {
1522 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1523 ebuf[ebuflen-1]='\0';
1524 return NULL;
1525 }
1526
1527 // Parsing dll below
1528 // If we can read dll-info and find that dll was built
1529 // for an architecture other than Hotspot is running in
1530 // - then print to buffer "DLL was built for a different architecture"
1531 // else call os::lasterror to obtain system error message
1532
1533 // Read system error message into ebuf
1534 // It may or may not be overwritten below (in the for loop and just above)
1535 lasterror(ebuf, (size_t) ebuflen);
1536 ebuf[ebuflen-1]='\0';
1537 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1538 if (file_descriptor<0)
1539 {
1540 return NULL;
1541 }
1542
1543 uint32_t signature_offset;
1544 uint16_t lib_arch=0;
1545 bool failed_to_get_lib_arch=
1546 (
1547 //Go to position 3c in the dll
1548 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1549 ||
1550 // Read loacation of signature
1551 (sizeof(signature_offset)!=
1552 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1553 ||
1554 //Go to COFF File Header in dll
1555 //that is located after"signature" (4 bytes long)
1556 (os::seek_to_file_offset(file_descriptor,
1557 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1558 ||
1559 //Read field that contains code of architecture
1560 // that dll was build for
1561 (sizeof(lib_arch)!=
1562 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1563 );
1564
1565 ::close(file_descriptor);
1566 if (failed_to_get_lib_arch)
1567 {
1568 // file i/o error - report os::lasterror(...) msg
1569 return NULL;
1570 }
1571
1572 typedef struct
1573 {
1574 uint16_t arch_code;
1575 char* arch_name;
1576 } arch_t;
1577
1578 static const arch_t arch_array[]={
1579 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1580 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1581 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1582 };
1583 #if (defined _M_IA64)
1584 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1585 #elif (defined _M_AMD64)
1586 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1587 #elif (defined _M_IX86)
1588 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1589 #else
1590 #error Method os::dll_load requires that one of following \
1591 is defined :_M_IA64,_M_AMD64 or _M_IX86
1592 #endif
1593
1594
1595 // Obtain a string for printf operation
1596 // lib_arch_str shall contain string what platform this .dll was built for
1597 // running_arch_str shall string contain what platform Hotspot was built for
1598 char *running_arch_str=NULL,*lib_arch_str=NULL;
1599 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1600 {
1601 if (lib_arch==arch_array[i].arch_code)
1602 lib_arch_str=arch_array[i].arch_name;
1603 if (running_arch==arch_array[i].arch_code)
1604 running_arch_str=arch_array[i].arch_name;
1605 }
1606
1607 assert(running_arch_str,
1608 "Didn't find runing architecture code in arch_array");
1609
1610 // If the architure is right
1611 // but some other error took place - report os::lasterror(...) msg
1612 if (lib_arch == running_arch)
1613 {
1614 return NULL;
1615 }
1616
1617 if (lib_arch_str!=NULL)
1618 {
1619 ::_snprintf(ebuf, ebuflen-1,
1620 "Can't load %s-bit .dll on a %s-bit platform",
1621 lib_arch_str,running_arch_str);
1622 }
1623 else
1624 {
1625 // don't know what architecture this dll was build for
1626 ::_snprintf(ebuf, ebuflen-1,
1627 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1628 lib_arch,running_arch_str);
1629 }
1630
1631 return NULL;
1632 }
1633
1634
1635 void os::print_dll_info(outputStream *st) {
1636 int pid = os::current_process_id();
1637 st->print_cr("Dynamic libraries:");
1638 enumerate_modules(pid, _print_module, (void *)st);
1639 }
1640
1641 void os::print_os_info_brief(outputStream* st) {
1642 os::print_os_info(st);
1643 }
1644
1645 void os::print_os_info(outputStream* st) {
1646 st->print("OS:");
1647
1648 os::win32::print_windows_version(st);
1649 }
1650
1651 void os::win32::print_windows_version(outputStream* st) {
1652 OSVERSIONINFOEX osvi;
1653 SYSTEM_INFO si;
1654
1655 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1656 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1657
1658 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1659 st->print_cr("N/A");
1660 return;
1661 }
1662
1663 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1664
1665 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1666 if (os_vers >= 5002) {
1667 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1668 // find out whether we are running on 64 bit processor or not.
1669 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) {
1670 os::Kernel32Dll::GetNativeSystemInfo(&si);
1671 } else {
1672 GetSystemInfo(&si);
1673 }
1674 }
1675
1676 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1677 switch (os_vers) {
1678 case 3051: st->print(" Windows NT 3.51"); break;
1679 case 4000: st->print(" Windows NT 4.0"); break;
1680 case 5000: st->print(" Windows 2000"); break;
1681 case 5001: st->print(" Windows XP"); break;
1682 case 5002:
1683 if (osvi.wProductType == VER_NT_WORKSTATION &&
1684 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1685 st->print(" Windows XP x64 Edition");
1686 } else {
1687 st->print(" Windows Server 2003 family");
1688 }
1689 break;
1690
1691 case 6000:
1692 if (osvi.wProductType == VER_NT_WORKSTATION) {
1693 st->print(" Windows Vista");
1694 } else {
1695 st->print(" Windows Server 2008");
1696 }
1697 break;
1698
1699 case 6001:
1700 if (osvi.wProductType == VER_NT_WORKSTATION) {
1701 st->print(" Windows 7");
1702 } else {
1703 st->print(" Windows Server 2008 R2");
1704 }
1705 break;
1706
1707 case 6002:
1708 if (osvi.wProductType == VER_NT_WORKSTATION) {
1709 st->print(" Windows 8");
1710 } else {
1711 st->print(" Windows Server 2012");
1712 }
1713 break;
1714
1715 case 6003:
1716 if (osvi.wProductType == VER_NT_WORKSTATION) {
1717 st->print(" Windows 8.1");
1718 } else {
1719 st->print(" Windows Server 2012 R2");
1720 }
1721 break;
1722
1723 default: // future os
1724 // Unrecognized windows, print out its major and minor versions
1725 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1726 }
1727 } else {
1728 switch (os_vers) {
1729 case 4000: st->print(" Windows 95"); break;
1730 case 4010: st->print(" Windows 98"); break;
1731 case 4090: st->print(" Windows Me"); break;
1732 default: // future windows, print out its major and minor versions
1733 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1734 }
1735 }
1736
1737 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1738 st->print(" , 64 bit");
1739 }
1740
1741 st->print(" Build %d", osvi.dwBuildNumber);
1742 st->print(" %s", osvi.szCSDVersion); // service pack
1743 st->cr();
1744 }
1745
1746 void os::pd_print_cpu_info(outputStream* st) {
1747 // Nothing to do for now.
1748 }
1749
1750 void os::print_memory_info(outputStream* st) {
1751 st->print("Memory:");
1752 st->print(" %dk page", os::vm_page_size()>>10);
1753
1754 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1755 // value if total memory is larger than 4GB
1756 MEMORYSTATUSEX ms;
1757 ms.dwLength = sizeof(ms);
1758 GlobalMemoryStatusEx(&ms);
1759
1760 st->print(", physical %uk", os::physical_memory() >> 10);
1761 st->print("(%uk free)", os::available_memory() >> 10);
1762
1763 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1764 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1765 st->cr();
1766 }
1767
1768 void os::print_siginfo(outputStream *st, void *siginfo) {
1769 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1770 st->print("siginfo:");
1771 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1772
1773 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1774 er->NumberParameters >= 2) {
1775 switch (er->ExceptionInformation[0]) {
1776 case 0: st->print(", reading address"); break;
1777 case 1: st->print(", writing address"); break;
1778 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1779 er->ExceptionInformation[0]);
1780 }
1781 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1782 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1783 er->NumberParameters >= 2 && UseSharedSpaces) {
1784 FileMapInfo* mapinfo = FileMapInfo::current_info();
1785 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1786 st->print("\n\nError accessing class data sharing archive." \
1787 " Mapped file inaccessible during execution, " \
1788 " possible disk/network problem.");
1789 }
1790 } else {
1791 int num = er->NumberParameters;
1792 if (num > 0) {
1793 st->print(", ExceptionInformation=");
1794 for (int i = 0; i < num; i++) {
1795 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1796 }
1797 }
1798 }
1799 st->cr();
1800 }
1801
1802 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1803 // do nothing
1804 }
1805
1806 static char saved_jvm_path[MAX_PATH] = {0};
1807
1808 // Find the full path to the current module, jvm.dll
1809 void os::jvm_path(char *buf, jint buflen) {
1810 // Error checking.
1811 if (buflen < MAX_PATH) {
1812 assert(false, "must use a large-enough buffer");
1813 buf[0] = '\0';
1814 return;
1815 }
1816 // Lazy resolve the path to current module.
1817 if (saved_jvm_path[0] != 0) {
1818 strcpy(buf, saved_jvm_path);
1819 return;
1820 }
1821
1822 buf[0] = '\0';
1823 if (Arguments::created_by_gamma_launcher()) {
1824 // Support for the gamma launcher. Check for an
1825 // JAVA_HOME environment variable
1826 // and fix up the path so it looks like
1827 // libjvm.so is installed there (append a fake suffix
1828 // hotspot/libjvm.so).
1829 char* java_home_var = ::getenv("JAVA_HOME");
1830 if (java_home_var != NULL && java_home_var[0] != 0 &&
1831 strlen(java_home_var) < (size_t)buflen) {
1832
1833 strncpy(buf, java_home_var, buflen);
1834
1835 // determine if this is a legacy image or modules image
1836 // modules image doesn't have "jre" subdirectory
1837 size_t len = strlen(buf);
1838 char* jrebin_p = buf + len;
1839 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1840 if (0 != _access(buf, 0)) {
1841 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1842 }
1843 len = strlen(buf);
1844 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1845 }
1846 }
1847
1848 if(buf[0] == '\0') {
1849 GetModuleFileName(vm_lib_handle, buf, buflen);
1850 }
1851 strncpy(saved_jvm_path, buf, MAX_PATH);
1852 }
1853
1854
1855 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1856 #ifndef _WIN64
1857 st->print("_");
1858 #endif
1859 }
1860
1861
1862 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1863 #ifndef _WIN64
1864 st->print("@%d", args_size * sizeof(int));
1865 #endif
1866 }
1867
1868 // This method is a copy of JDK's sysGetLastErrorString
1869 // from src/windows/hpi/src/system_md.c
1870
1871 size_t os::lasterror(char* buf, size_t len) {
1872 DWORD errval;
1873
1874 if ((errval = GetLastError()) != 0) {
1875 // DOS error
1876 size_t n = (size_t)FormatMessage(
1877 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1878 NULL,
1879 errval,
1880 0,
1881 buf,
1882 (DWORD)len,
1883 NULL);
1884 if (n > 3) {
1885 // Drop final '.', CR, LF
1886 if (buf[n - 1] == '\n') n--;
1887 if (buf[n - 1] == '\r') n--;
1888 if (buf[n - 1] == '.') n--;
1889 buf[n] = '\0';
1890 }
1891 return n;
1892 }
1893
1894 if (errno != 0) {
1895 // C runtime error that has no corresponding DOS error code
1896 const char* s = strerror(errno);
1897 size_t n = strlen(s);
1898 if (n >= len) n = len - 1;
1899 strncpy(buf, s, n);
1900 buf[n] = '\0';
1901 return n;
1902 }
1903
1904 return 0;
1905 }
1906
1907 int os::get_last_error() {
1908 DWORD error = GetLastError();
1909 if (error == 0)
1910 error = errno;
1911 return (int)error;
1912 }
1913
1914 // sun.misc.Signal
1915 // NOTE that this is a workaround for an apparent kernel bug where if
1916 // a signal handler for SIGBREAK is installed then that signal handler
1917 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1918 // See bug 4416763.
1919 static void (*sigbreakHandler)(int) = NULL;
1920
1921 static void UserHandler(int sig, void *siginfo, void *context) {
1922 os::signal_notify(sig);
1923 // We need to reinstate the signal handler each time...
1924 os::signal(sig, (void*)UserHandler);
1925 }
1926
1927 void* os::user_handler() {
1928 return (void*) UserHandler;
1929 }
1930
1931 void* os::signal(int signal_number, void* handler) {
1932 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1933 void (*oldHandler)(int) = sigbreakHandler;
1934 sigbreakHandler = (void (*)(int)) handler;
1935 return (void*) oldHandler;
1936 } else {
1937 return (void*)::signal(signal_number, (void (*)(int))handler);
1938 }
1939 }
1940
1941 void os::signal_raise(int signal_number) {
1942 raise(signal_number);
1943 }
1944
1945 // The Win32 C runtime library maps all console control events other than ^C
1946 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1947 // logoff, and shutdown events. We therefore install our own console handler
1948 // that raises SIGTERM for the latter cases.
1949 //
1950 static BOOL WINAPI consoleHandler(DWORD event) {
1951 switch(event) {
1952 case CTRL_C_EVENT:
1953 if (is_error_reported()) {
1954 // Ctrl-C is pressed during error reporting, likely because the error
1955 // handler fails to abort. Let VM die immediately.
1956 os::die();
1957 }
1958
1959 os::signal_raise(SIGINT);
1960 return TRUE;
1961 break;
1962 case CTRL_BREAK_EVENT:
1963 if (sigbreakHandler != NULL) {
1964 (*sigbreakHandler)(SIGBREAK);
1965 }
1966 return TRUE;
1967 break;
1968 case CTRL_LOGOFF_EVENT: {
1969 // Don't terminate JVM if it is running in a non-interactive session,
1970 // such as a service process.
1971 USEROBJECTFLAGS flags;
1972 HANDLE handle = GetProcessWindowStation();
1973 if (handle != NULL &&
1974 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1975 sizeof( USEROBJECTFLAGS), NULL)) {
1976 // If it is a non-interactive session, let next handler to deal
1977 // with it.
1978 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1979 return FALSE;
1980 }
1981 }
1982 }
1983 case CTRL_CLOSE_EVENT:
1984 case CTRL_SHUTDOWN_EVENT:
1985 os::signal_raise(SIGTERM);
1986 return TRUE;
1987 break;
1988 default:
1989 break;
1990 }
1991 return FALSE;
1992 }
1993
1994 /*
1995 * The following code is moved from os.cpp for making this
1996 * code platform specific, which it is by its very nature.
1997 */
1998
1999 // Return maximum OS signal used + 1 for internal use only
2000 // Used as exit signal for signal_thread
2001 int os::sigexitnum_pd(){
2002 return NSIG;
2003 }
2004
2005 // a counter for each possible signal value, including signal_thread exit signal
2006 static volatile jint pending_signals[NSIG+1] = { 0 };
2007 static HANDLE sig_sem = NULL;
2008
2009 void os::signal_init_pd() {
2010 // Initialize signal structures
2011 memset((void*)pending_signals, 0, sizeof(pending_signals));
2012
2013 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2014
2015 // Programs embedding the VM do not want it to attempt to receive
2016 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2017 // shutdown hooks mechanism introduced in 1.3. For example, when
2018 // the VM is run as part of a Windows NT service (i.e., a servlet
2019 // engine in a web server), the correct behavior is for any console
2020 // control handler to return FALSE, not TRUE, because the OS's
2021 // "final" handler for such events allows the process to continue if
2022 // it is a service (while terminating it if it is not a service).
2023 // To make this behavior uniform and the mechanism simpler, we
2024 // completely disable the VM's usage of these console events if -Xrs
2025 // (=ReduceSignalUsage) is specified. This means, for example, that
2026 // the CTRL-BREAK thread dump mechanism is also disabled in this
2027 // case. See bugs 4323062, 4345157, and related bugs.
2028
2029 if (!ReduceSignalUsage) {
2030 // Add a CTRL-C handler
2031 SetConsoleCtrlHandler(consoleHandler, TRUE);
2032 }
2033 }
2034
2035 void os::signal_notify(int signal_number) {
2036 BOOL ret;
2037 if (sig_sem != NULL) {
2038 Atomic::inc(&pending_signals[signal_number]);
2039 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2040 assert(ret != 0, "ReleaseSemaphore() failed");
2041 }
2042 }
2043
2044 static int check_pending_signals(bool wait_for_signal) {
2045 DWORD ret;
2046 while (true) {
2047 for (int i = 0; i < NSIG + 1; i++) {
2048 jint n = pending_signals[i];
2049 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2050 return i;
2051 }
2052 }
2053 if (!wait_for_signal) {
2054 return -1;
2055 }
2056
2057 JavaThread *thread = JavaThread::current();
2058
2059 ThreadBlockInVM tbivm(thread);
2060
2061 bool threadIsSuspended;
2062 do {
2063 thread->set_suspend_equivalent();
2064 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2065 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2066 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2067
2068 // were we externally suspended while we were waiting?
2069 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2070 if (threadIsSuspended) {
2071 //
2072 // The semaphore has been incremented, but while we were waiting
2073 // another thread suspended us. We don't want to continue running
2074 // while suspended because that would surprise the thread that
2075 // suspended us.
2076 //
2077 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2078 assert(ret != 0, "ReleaseSemaphore() failed");
2079
2080 thread->java_suspend_self();
2081 }
2082 } while (threadIsSuspended);
2083 }
2084 }
2085
2086 int os::signal_lookup() {
2087 return check_pending_signals(false);
2088 }
2089
2090 int os::signal_wait() {
2091 return check_pending_signals(true);
2092 }
2093
2094 // Implicit OS exception handling
2095
2096 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2097 JavaThread* thread = JavaThread::current();
2098 // Save pc in thread
2099 #ifdef _M_IA64
2100 // Do not blow up if no thread info available.
2101 if (thread) {
2102 // Saving PRECISE pc (with slot information) in thread.
2103 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2104 // Convert precise PC into "Unix" format
2105 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2106 thread->set_saved_exception_pc((address)precise_pc);
2107 }
2108 // Set pc to handler
2109 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2110 // Clear out psr.ri (= Restart Instruction) in order to continue
2111 // at the beginning of the target bundle.
2112 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2113 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2114 #elif _M_AMD64
2115 // Do not blow up if no thread info available.
2116 if (thread) {
2117 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2118 }
2119 // Set pc to handler
2120 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2121 #else
2122 // Do not blow up if no thread info available.
2123 if (thread) {
2124 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2125 }
2126 // Set pc to handler
2127 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2128 #endif
2129
2130 // Continue the execution
2131 return EXCEPTION_CONTINUE_EXECUTION;
2132 }
2133
2134
2135 // Used for PostMortemDump
2136 extern "C" void safepoints();
2137 extern "C" void find(int x);
2138 extern "C" void events();
2139
2140 // According to Windows API documentation, an illegal instruction sequence should generate
2141 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2142 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2143 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2144
2145 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2146
2147 // From "Execution Protection in the Windows Operating System" draft 0.35
2148 // Once a system header becomes available, the "real" define should be
2149 // included or copied here.
2150 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2151
2152 // Handle NAT Bit consumption on IA64.
2153 #ifdef _M_IA64
2154 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2155 #endif
2156
2157 // Windows Vista/2008 heap corruption check
2158 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2159
2160 #define def_excpt(val) #val, val
2161
2162 struct siglabel {
2163 char *name;
2164 int number;
2165 };
2166
2167 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2168 // C++ compiler contain this error code. Because this is a compiler-generated
2169 // error, the code is not listed in the Win32 API header files.
2170 // The code is actually a cryptic mnemonic device, with the initial "E"
2171 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2172 // ASCII values of "msc".
2173
2174 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2175
2176
2177 struct siglabel exceptlabels[] = {
2178 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2179 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2180 def_excpt(EXCEPTION_BREAKPOINT),
2181 def_excpt(EXCEPTION_SINGLE_STEP),
2182 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2183 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2184 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2185 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2186 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2187 def_excpt(EXCEPTION_FLT_OVERFLOW),
2188 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2189 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2190 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2191 def_excpt(EXCEPTION_INT_OVERFLOW),
2192 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2193 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2194 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2195 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2196 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2197 def_excpt(EXCEPTION_STACK_OVERFLOW),
2198 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2199 def_excpt(EXCEPTION_GUARD_PAGE),
2200 def_excpt(EXCEPTION_INVALID_HANDLE),
2201 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2202 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2203 #ifdef _M_IA64
2204 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2205 #endif
2206 NULL, 0
2207 };
2208
2209 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2210 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2211 if (exceptlabels[i].number == exception_code) {
2212 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2213 return buf;
2214 }
2215 }
2216
2217 return NULL;
2218 }
2219
2220 //-----------------------------------------------------------------------------
2221 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2222 // handle exception caused by idiv; should only happen for -MinInt/-1
2223 // (division by zero is handled explicitly)
2224 #ifdef _M_IA64
2225 assert(0, "Fix Handle_IDiv_Exception");
2226 #elif _M_AMD64
2227 PCONTEXT ctx = exceptionInfo->ContextRecord;
2228 address pc = (address)ctx->Rip;
2229 assert(pc[0] == 0xF7, "not an idiv opcode");
2230 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2231 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2232 // set correct result values and continue after idiv instruction
2233 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2234 ctx->Rax = (DWORD)min_jint; // result
2235 ctx->Rdx = (DWORD)0; // remainder
2236 // Continue the execution
2237 #else
2238 PCONTEXT ctx = exceptionInfo->ContextRecord;
2239 address pc = (address)ctx->Eip;
2240 assert(pc[0] == 0xF7, "not an idiv opcode");
2241 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2242 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2243 // set correct result values and continue after idiv instruction
2244 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2245 ctx->Eax = (DWORD)min_jint; // result
2246 ctx->Edx = (DWORD)0; // remainder
2247 // Continue the execution
2248 #endif
2249 return EXCEPTION_CONTINUE_EXECUTION;
2250 }
2251
2252 #ifndef _WIN64
2253 //-----------------------------------------------------------------------------
2254 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2255 // handle exception caused by native method modifying control word
2256 PCONTEXT ctx = exceptionInfo->ContextRecord;
2257 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2258
2259 switch (exception_code) {
2260 case EXCEPTION_FLT_DENORMAL_OPERAND:
2261 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2262 case EXCEPTION_FLT_INEXACT_RESULT:
2263 case EXCEPTION_FLT_INVALID_OPERATION:
2264 case EXCEPTION_FLT_OVERFLOW:
2265 case EXCEPTION_FLT_STACK_CHECK:
2266 case EXCEPTION_FLT_UNDERFLOW:
2267 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2268 if (fp_control_word != ctx->FloatSave.ControlWord) {
2269 // Restore FPCW and mask out FLT exceptions
2270 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2271 // Mask out pending FLT exceptions
2272 ctx->FloatSave.StatusWord &= 0xffffff00;
2273 return EXCEPTION_CONTINUE_EXECUTION;
2274 }
2275 }
2276
2277 if (prev_uef_handler != NULL) {
2278 // We didn't handle this exception so pass it to the previous
2279 // UnhandledExceptionFilter.
2280 return (prev_uef_handler)(exceptionInfo);
2281 }
2282
2283 return EXCEPTION_CONTINUE_SEARCH;
2284 }
2285 #else //_WIN64
2286 /*
2287 On Windows, the mxcsr control bits are non-volatile across calls
2288 See also CR 6192333
2289 If EXCEPTION_FLT_* happened after some native method modified
2290 mxcsr - it is not a jvm fault.
2291 However should we decide to restore of mxcsr after a faulty
2292 native method we can uncomment following code
2293 jint MxCsr = INITIAL_MXCSR;
2294 // we can't use StubRoutines::addr_mxcsr_std()
2295 // because in Win64 mxcsr is not saved there
2296 if (MxCsr != ctx->MxCsr) {
2297 ctx->MxCsr = MxCsr;
2298 return EXCEPTION_CONTINUE_EXECUTION;
2299 }
2300
2301 */
2302 #endif // _WIN64
2303
2304
2305 static inline void report_error(Thread* t, DWORD exception_code,
2306 address addr, void* siginfo, void* context) {
2307 VMError err(t, exception_code, addr, siginfo, context);
2308 err.report_and_die();
2309
2310 // If UseOsErrorReporting, this will return here and save the error file
2311 // somewhere where we can find it in the minidump.
2312 }
2313
2314 //-----------------------------------------------------------------------------
2315 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2316 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2317 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2318 #ifdef _M_IA64
2319 // On Itanium, we need the "precise pc", which has the slot number coded
2320 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2321 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2322 // Convert the pc to "Unix format", which has the slot number coded
2323 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2324 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2325 // information is saved in the Unix format.
2326 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2327 #elif _M_AMD64
2328 address pc = (address) exceptionInfo->ContextRecord->Rip;
2329 #else
2330 address pc = (address) exceptionInfo->ContextRecord->Eip;
2331 #endif
2332 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2333
2334 // Handle SafeFetch32 and SafeFetchN exceptions.
2335 if (StubRoutines::is_safefetch_fault(pc)) {
2336 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2337 }
2338
2339 #ifndef _WIN64
2340 // Execution protection violation - win32 running on AMD64 only
2341 // Handled first to avoid misdiagnosis as a "normal" access violation;
2342 // This is safe to do because we have a new/unique ExceptionInformation
2343 // code for this condition.
2344 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2345 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2346 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2347 address addr = (address) exceptionRecord->ExceptionInformation[1];
2348
2349 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2350 int page_size = os::vm_page_size();
2351
2352 // Make sure the pc and the faulting address are sane.
2353 //
2354 // If an instruction spans a page boundary, and the page containing
2355 // the beginning of the instruction is executable but the following
2356 // page is not, the pc and the faulting address might be slightly
2357 // different - we still want to unguard the 2nd page in this case.
2358 //
2359 // 15 bytes seems to be a (very) safe value for max instruction size.
2360 bool pc_is_near_addr =
2361 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2362 bool instr_spans_page_boundary =
2363 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2364 (intptr_t) page_size) > 0);
2365
2366 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2367 static volatile address last_addr =
2368 (address) os::non_memory_address_word();
2369
2370 // In conservative mode, don't unguard unless the address is in the VM
2371 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2372 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2373
2374 // Set memory to RWX and retry
2375 address page_start =
2376 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2377 bool res = os::protect_memory((char*) page_start, page_size,
2378 os::MEM_PROT_RWX);
2379
2380 if (PrintMiscellaneous && Verbose) {
2381 char buf[256];
2382 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2383 "at " INTPTR_FORMAT
2384 ", unguarding " INTPTR_FORMAT ": %s", addr,
2385 page_start, (res ? "success" : strerror(errno)));
2386 tty->print_raw_cr(buf);
2387 }
2388
2389 // Set last_addr so if we fault again at the same address, we don't
2390 // end up in an endless loop.
2391 //
2392 // There are two potential complications here. Two threads trapping
2393 // at the same address at the same time could cause one of the
2394 // threads to think it already unguarded, and abort the VM. Likely
2395 // very rare.
2396 //
2397 // The other race involves two threads alternately trapping at
2398 // different addresses and failing to unguard the page, resulting in
2399 // an endless loop. This condition is probably even more unlikely
2400 // than the first.
2401 //
2402 // Although both cases could be avoided by using locks or thread
2403 // local last_addr, these solutions are unnecessary complication:
2404 // this handler is a best-effort safety net, not a complete solution.
2405 // It is disabled by default and should only be used as a workaround
2406 // in case we missed any no-execute-unsafe VM code.
2407
2408 last_addr = addr;
2409
2410 return EXCEPTION_CONTINUE_EXECUTION;
2411 }
2412 }
2413
2414 // Last unguard failed or not unguarding
2415 tty->print_raw_cr("Execution protection violation");
2416 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2417 exceptionInfo->ContextRecord);
2418 return EXCEPTION_CONTINUE_SEARCH;
2419 }
2420 }
2421 #endif // _WIN64
2422
2423 // Check to see if we caught the safepoint code in the
2424 // process of write protecting the memory serialization page.
2425 // It write enables the page immediately after protecting it
2426 // so just return.
2427 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2428 JavaThread* thread = (JavaThread*) t;
2429 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2430 address addr = (address) exceptionRecord->ExceptionInformation[1];
2431 if ( os::is_memory_serialize_page(thread, addr) ) {
2432 // Block current thread until the memory serialize page permission restored.
2433 os::block_on_serialize_page_trap();
2434 return EXCEPTION_CONTINUE_EXECUTION;
2435 }
2436 }
2437
2438 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2439 VM_Version::is_cpuinfo_segv_addr(pc)) {
2440 // Verify that OS save/restore AVX registers.
2441 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2442 }
2443
2444 if (t != NULL && t->is_Java_thread()) {
2445 JavaThread* thread = (JavaThread*) t;
2446 bool in_java = thread->thread_state() == _thread_in_Java;
2447
2448 // Handle potential stack overflows up front.
2449 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2450 if (os::uses_stack_guard_pages()) {
2451 #ifdef _M_IA64
2452 // Use guard page for register stack.
2453 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2454 address addr = (address) exceptionRecord->ExceptionInformation[1];
2455 // Check for a register stack overflow on Itanium
2456 if (thread->addr_inside_register_stack_red_zone(addr)) {
2457 // Fatal red zone violation happens if the Java program
2458 // catches a StackOverflow error and does so much processing
2459 // that it runs beyond the unprotected yellow guard zone. As
2460 // a result, we are out of here.
2461 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2462 } else if(thread->addr_inside_register_stack(addr)) {
2463 // Disable the yellow zone which sets the state that
2464 // we've got a stack overflow problem.
2465 if (thread->stack_yellow_zone_enabled()) {
2466 thread->disable_stack_yellow_zone();
2467 }
2468 // Give us some room to process the exception.
2469 thread->disable_register_stack_guard();
2470 // Tracing with +Verbose.
2471 if (Verbose) {
2472 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2473 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2474 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2475 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2476 thread->register_stack_base(),
2477 thread->register_stack_base() + thread->stack_size());
2478 }
2479
2480 // Reguard the permanent register stack red zone just to be sure.
2481 // We saw Windows silently disabling this without telling us.
2482 thread->enable_register_stack_red_zone();
2483
2484 return Handle_Exception(exceptionInfo,
2485 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2486 }
2487 #endif
2488 if (thread->stack_yellow_zone_enabled()) {
2489 // Yellow zone violation. The o/s has unprotected the first yellow
2490 // zone page for us. Note: must call disable_stack_yellow_zone to
2491 // update the enabled status, even if the zone contains only one page.
2492 thread->disable_stack_yellow_zone();
2493 // If not in java code, return and hope for the best.
2494 return in_java ? Handle_Exception(exceptionInfo,
2495 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2496 : EXCEPTION_CONTINUE_EXECUTION;
2497 } else {
2498 // Fatal red zone violation.
2499 thread->disable_stack_red_zone();
2500 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2501 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2502 exceptionInfo->ContextRecord);
2503 return EXCEPTION_CONTINUE_SEARCH;
2504 }
2505 } else if (in_java) {
2506 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2507 // a one-time-only guard page, which it has released to us. The next
2508 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2509 return Handle_Exception(exceptionInfo,
2510 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2511 } else {
2512 // Can only return and hope for the best. Further stack growth will
2513 // result in an ACCESS_VIOLATION.
2514 return EXCEPTION_CONTINUE_EXECUTION;
2515 }
2516 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2517 // Either stack overflow or null pointer exception.
2518 if (in_java) {
2519 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2520 address addr = (address) exceptionRecord->ExceptionInformation[1];
2521 address stack_end = thread->stack_base() - thread->stack_size();
2522 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2523 // Stack overflow.
2524 assert(!os::uses_stack_guard_pages(),
2525 "should be caught by red zone code above.");
2526 return Handle_Exception(exceptionInfo,
2527 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2528 }
2529 //
2530 // Check for safepoint polling and implicit null
2531 // We only expect null pointers in the stubs (vtable)
2532 // the rest are checked explicitly now.
2533 //
2534 CodeBlob* cb = CodeCache::find_blob(pc);
2535 if (cb != NULL) {
2536 if (os::is_poll_address(addr)) {
2537 address stub = SharedRuntime::get_poll_stub(pc);
2538 return Handle_Exception(exceptionInfo, stub);
2539 }
2540 }
2541 {
2542 #ifdef _WIN64
2543 //
2544 // If it's a legal stack address map the entire region in
2545 //
2546 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2547 address addr = (address) exceptionRecord->ExceptionInformation[1];
2548 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2549 addr = (address)((uintptr_t)addr &
2550 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2551 os::commit_memory((char *)addr, thread->stack_base() - addr,
2552 !ExecMem);
2553 return EXCEPTION_CONTINUE_EXECUTION;
2554 }
2555 else
2556 #endif
2557 {
2558 // Null pointer exception.
2559 #ifdef _M_IA64
2560 // Process implicit null checks in compiled code. Note: Implicit null checks
2561 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2562 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2563 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2564 // Handle implicit null check in UEP method entry
2565 if (cb && (cb->is_frame_complete_at(pc) ||
2566 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2567 if (Verbose) {
2568 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2569 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2570 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2571 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2572 *(bundle_start + 1), *bundle_start);
2573 }
2574 return Handle_Exception(exceptionInfo,
2575 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2576 }
2577 }
2578
2579 // Implicit null checks were processed above. Hence, we should not reach
2580 // here in the usual case => die!
2581 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2582 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2583 exceptionInfo->ContextRecord);
2584 return EXCEPTION_CONTINUE_SEARCH;
2585
2586 #else // !IA64
2587
2588 // Windows 98 reports faulting addresses incorrectly
2589 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2590 !os::win32::is_nt()) {
2591 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2592 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2593 }
2594 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2595 exceptionInfo->ContextRecord);
2596 return EXCEPTION_CONTINUE_SEARCH;
2597 #endif
2598 }
2599 }
2600 }
2601
2602 #ifdef _WIN64
2603 // Special care for fast JNI field accessors.
2604 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2605 // in and the heap gets shrunk before the field access.
2606 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2607 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2608 if (addr != (address)-1) {
2609 return Handle_Exception(exceptionInfo, addr);
2610 }
2611 }
2612 #endif
2613
2614 // Stack overflow or null pointer exception in native code.
2615 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2616 exceptionInfo->ContextRecord);
2617 return EXCEPTION_CONTINUE_SEARCH;
2618 } // /EXCEPTION_ACCESS_VIOLATION
2619 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2620 #if defined _M_IA64
2621 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2622 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2623 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2624
2625 // Compiled method patched to be non entrant? Following conditions must apply:
2626 // 1. must be first instruction in bundle
2627 // 2. must be a break instruction with appropriate code
2628 if((((uint64_t) pc & 0x0F) == 0) &&
2629 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2630 return Handle_Exception(exceptionInfo,
2631 (address)SharedRuntime::get_handle_wrong_method_stub());
2632 }
2633 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2634 #endif
2635
2636
2637 if (in_java) {
2638 switch (exception_code) {
2639 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2640 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2641
2642 case EXCEPTION_INT_OVERFLOW:
2643 return Handle_IDiv_Exception(exceptionInfo);
2644
2645 } // switch
2646 }
2647 #ifndef _WIN64
2648 if (((thread->thread_state() == _thread_in_Java) ||
2649 (thread->thread_state() == _thread_in_native)) &&
2650 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2651 {
2652 LONG result=Handle_FLT_Exception(exceptionInfo);
2653 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2654 }
2655 #endif //_WIN64
2656 }
2657
2658 if (exception_code != EXCEPTION_BREAKPOINT) {
2659 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2660 exceptionInfo->ContextRecord);
2661 }
2662 return EXCEPTION_CONTINUE_SEARCH;
2663 }
2664
2665 #ifndef _WIN64
2666 // Special care for fast JNI accessors.
2667 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2668 // the heap gets shrunk before the field access.
2669 // Need to install our own structured exception handler since native code may
2670 // install its own.
2671 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2672 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2673 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2674 address pc = (address) exceptionInfo->ContextRecord->Eip;
2675 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2676 if (addr != (address)-1) {
2677 return Handle_Exception(exceptionInfo, addr);
2678 }
2679 }
2680 return EXCEPTION_CONTINUE_SEARCH;
2681 }
2682
2683 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2684 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2685 __try { \
2686 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2687 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2688 } \
2689 return 0; \
2690 }
2691
2692 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2693 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2694 DEFINE_FAST_GETFIELD(jchar, char, Char)
2695 DEFINE_FAST_GETFIELD(jshort, short, Short)
2696 DEFINE_FAST_GETFIELD(jint, int, Int)
2697 DEFINE_FAST_GETFIELD(jlong, long, Long)
2698 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2699 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2700
2701 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2702 switch (type) {
2703 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2704 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2705 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2706 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2707 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2708 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2709 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2710 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2711 default: ShouldNotReachHere();
2712 }
2713 return (address)-1;
2714 }
2715 #endif
2716
2717 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2718 // Install a win32 structured exception handler around the test
2719 // function call so the VM can generate an error dump if needed.
2720 __try {
2721 (*funcPtr)();
2722 } __except(topLevelExceptionFilter(
2723 (_EXCEPTION_POINTERS*)_exception_info())) {
2724 // Nothing to do.
2725 }
2726 }
2727
2728 // Virtual Memory
2729
2730 int os::vm_page_size() { return os::win32::vm_page_size(); }
2731 int os::vm_allocation_granularity() {
2732 return os::win32::vm_allocation_granularity();
2733 }
2734
2735 // Windows large page support is available on Windows 2003. In order to use
2736 // large page memory, the administrator must first assign additional privilege
2737 // to the user:
2738 // + select Control Panel -> Administrative Tools -> Local Security Policy
2739 // + select Local Policies -> User Rights Assignment
2740 // + double click "Lock pages in memory", add users and/or groups
2741 // + reboot
2742 // Note the above steps are needed for administrator as well, as administrators
2743 // by default do not have the privilege to lock pages in memory.
2744 //
2745 // Note about Windows 2003: although the API supports committing large page
2746 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2747 // scenario, I found through experiment it only uses large page if the entire
2748 // memory region is reserved and committed in a single VirtualAlloc() call.
2749 // This makes Windows large page support more or less like Solaris ISM, in
2750 // that the entire heap must be committed upfront. This probably will change
2751 // in the future, if so the code below needs to be revisited.
2752
2753 #ifndef MEM_LARGE_PAGES
2754 #define MEM_LARGE_PAGES 0x20000000
2755 #endif
2756
2757 static HANDLE _hProcess;
2758 static HANDLE _hToken;
2759
2760 // Container for NUMA node list info
2761 class NUMANodeListHolder {
2762 private:
2763 int *_numa_used_node_list; // allocated below
2764 int _numa_used_node_count;
2765
2766 void free_node_list() {
2767 if (_numa_used_node_list != NULL) {
2768 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2769 }
2770 }
2771
2772 public:
2773 NUMANodeListHolder() {
2774 _numa_used_node_count = 0;
2775 _numa_used_node_list = NULL;
2776 // do rest of initialization in build routine (after function pointers are set up)
2777 }
2778
2779 ~NUMANodeListHolder() {
2780 free_node_list();
2781 }
2782
2783 bool build() {
2784 DWORD_PTR proc_aff_mask;
2785 DWORD_PTR sys_aff_mask;
2786 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2787 ULONG highest_node_number;
2788 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2789 free_node_list();
2790 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2791 for (unsigned int i = 0; i <= highest_node_number; i++) {
2792 ULONGLONG proc_mask_numa_node;
2793 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2794 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2795 _numa_used_node_list[_numa_used_node_count++] = i;
2796 }
2797 }
2798 return (_numa_used_node_count > 1);
2799 }
2800
2801 int get_count() {return _numa_used_node_count;}
2802 int get_node_list_entry(int n) {
2803 // for indexes out of range, returns -1
2804 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2805 }
2806
2807 } numa_node_list_holder;
2808
2809
2810
2811 static size_t _large_page_size = 0;
2812
2813 static bool resolve_functions_for_large_page_init() {
2814 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2815 os::Advapi32Dll::AdvapiAvailable();
2816 }
2817
2818 static bool request_lock_memory_privilege() {
2819 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2820 os::current_process_id());
2821
2822 LUID luid;
2823 if (_hProcess != NULL &&
2824 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2825 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2826
2827 TOKEN_PRIVILEGES tp;
2828 tp.PrivilegeCount = 1;
2829 tp.Privileges[0].Luid = luid;
2830 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2831
2832 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2833 // privilege. Check GetLastError() too. See MSDN document.
2834 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2835 (GetLastError() == ERROR_SUCCESS)) {
2836 return true;
2837 }
2838 }
2839
2840 return false;
2841 }
2842
2843 static void cleanup_after_large_page_init() {
2844 if (_hProcess) CloseHandle(_hProcess);
2845 _hProcess = NULL;
2846 if (_hToken) CloseHandle(_hToken);
2847 _hToken = NULL;
2848 }
2849
2850 static bool numa_interleaving_init() {
2851 bool success = false;
2852 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2853
2854 // print a warning if UseNUMAInterleaving flag is specified on command line
2855 bool warn_on_failure = use_numa_interleaving_specified;
2856 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2857
2858 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2859 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2860 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2861
2862 if (os::Kernel32Dll::NumaCallsAvailable()) {
2863 if (numa_node_list_holder.build()) {
2864 if (PrintMiscellaneous && Verbose) {
2865 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2866 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2867 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2868 }
2869 tty->print("\n");
2870 }
2871 success = true;
2872 } else {
2873 WARN("Process does not cover multiple NUMA nodes.");
2874 }
2875 } else {
2876 WARN("NUMA Interleaving is not supported by the operating system.");
2877 }
2878 if (!success) {
2879 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2880 }
2881 return success;
2882 #undef WARN
2883 }
2884
2885 // this routine is used whenever we need to reserve a contiguous VA range
2886 // but we need to make separate VirtualAlloc calls for each piece of the range
2887 // Reasons for doing this:
2888 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2889 // * UseNUMAInterleaving requires a separate node for each piece
2890 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2891 bool should_inject_error=false) {
2892 char * p_buf;
2893 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2894 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2895 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2896
2897 // first reserve enough address space in advance since we want to be
2898 // able to break a single contiguous virtual address range into multiple
2899 // large page commits but WS2003 does not allow reserving large page space
2900 // so we just use 4K pages for reserve, this gives us a legal contiguous
2901 // address space. then we will deallocate that reservation, and re alloc
2902 // using large pages
2903 const size_t size_of_reserve = bytes + chunk_size;
2904 if (bytes > size_of_reserve) {
2905 // Overflowed.
2906 return NULL;
2907 }
2908 p_buf = (char *) VirtualAlloc(addr,
2909 size_of_reserve, // size of Reserve
2910 MEM_RESERVE,
2911 PAGE_READWRITE);
2912 // If reservation failed, return NULL
2913 if (p_buf == NULL) return NULL;
2914 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2915 os::release_memory(p_buf, bytes + chunk_size);
2916
2917 // we still need to round up to a page boundary (in case we are using large pages)
2918 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2919 // instead we handle this in the bytes_to_rq computation below
2920 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2921
2922 // now go through and allocate one chunk at a time until all bytes are
2923 // allocated
2924 size_t bytes_remaining = bytes;
2925 // An overflow of align_size_up() would have been caught above
2926 // in the calculation of size_of_reserve.
2927 char * next_alloc_addr = p_buf;
2928 HANDLE hProc = GetCurrentProcess();
2929
2930 #ifdef ASSERT
2931 // Variable for the failure injection
2932 long ran_num = os::random();
2933 size_t fail_after = ran_num % bytes;
2934 #endif
2935
2936 int count=0;
2937 while (bytes_remaining) {
2938 // select bytes_to_rq to get to the next chunk_size boundary
2939
2940 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2941 // Note allocate and commit
2942 char * p_new;
2943
2944 #ifdef ASSERT
2945 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2946 #else
2947 const bool inject_error_now = false;
2948 #endif
2949
2950 if (inject_error_now) {
2951 p_new = NULL;
2952 } else {
2953 if (!UseNUMAInterleaving) {
2954 p_new = (char *) VirtualAlloc(next_alloc_addr,
2955 bytes_to_rq,
2956 flags,
2957 prot);
2958 } else {
2959 // get the next node to use from the used_node_list
2960 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2961 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2962 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2963 next_alloc_addr,
2964 bytes_to_rq,
2965 flags,
2966 prot,
2967 node);
2968 }
2969 }
2970
2971 if (p_new == NULL) {
2972 // Free any allocated pages
2973 if (next_alloc_addr > p_buf) {
2974 // Some memory was committed so release it.
2975 size_t bytes_to_release = bytes - bytes_remaining;
2976 // NMT has yet to record any individual blocks, so it
2977 // need to create a dummy 'reserve' record to match
2978 // the release.
2979 MemTracker::record_virtual_memory_reserve((address)p_buf,
2980 bytes_to_release, CALLER_PC);
2981 os::release_memory(p_buf, bytes_to_release);
2982 }
2983 #ifdef ASSERT
2984 if (should_inject_error) {
2985 if (TracePageSizes && Verbose) {
2986 tty->print_cr("Reserving pages individually failed.");
2987 }
2988 }
2989 #endif
2990 return NULL;
2991 }
2992
2993 bytes_remaining -= bytes_to_rq;
2994 next_alloc_addr += bytes_to_rq;
2995 count++;
2996 }
2997 // Although the memory is allocated individually, it is returned as one.
2998 // NMT records it as one block.
2999 if ((flags & MEM_COMMIT) != 0) {
3000 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3001 } else {
3002 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3003 }
3004
3005 // made it this far, success
3006 return p_buf;
3007 }
3008
3009
3010
3011 void os::large_page_init() {
3012 if (!UseLargePages) return;
3013
3014 // print a warning if any large page related flag is specified on command line
3015 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3016 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3017 bool success = false;
3018
3019 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3020 if (resolve_functions_for_large_page_init()) {
3021 if (request_lock_memory_privilege()) {
3022 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3023 if (s) {
3024 #if defined(IA32) || defined(AMD64)
3025 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3026 WARN("JVM cannot use large pages bigger than 4mb.");
3027 } else {
3028 #endif
3029 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3030 _large_page_size = LargePageSizeInBytes;
3031 } else {
3032 _large_page_size = s;
3033 }
3034 success = true;
3035 #if defined(IA32) || defined(AMD64)
3036 }
3037 #endif
3038 } else {
3039 WARN("Large page is not supported by the processor.");
3040 }
3041 } else {
3042 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3043 }
3044 } else {
3045 WARN("Large page is not supported by the operating system.");
3046 }
3047 #undef WARN
3048
3049 const size_t default_page_size = (size_t) vm_page_size();
3050 if (success && _large_page_size > default_page_size) {
3051 _page_sizes[0] = _large_page_size;
3052 _page_sizes[1] = default_page_size;
3053 _page_sizes[2] = 0;
3054 }
3055
3056 cleanup_after_large_page_init();
3057 UseLargePages = success;
3058 }
3059
3060 // On win32, one cannot release just a part of reserved memory, it's an
3061 // all or nothing deal. When we split a reservation, we must break the
3062 // reservation into two reservations.
3063 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3064 bool realloc) {
3065 if (size > 0) {
3066 release_memory(base, size);
3067 if (realloc) {
3068 reserve_memory(split, base);
3069 }
3070 if (size != split) {
3071 reserve_memory(size - split, base + split);
3072 }
3073 }
3074 }
3075
3076 // Multiple threads can race in this code but it's not possible to unmap small sections of
3077 // virtual space to get requested alignment, like posix-like os's.
3078 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3079 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3080 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3081 "Alignment must be a multiple of allocation granularity (page size)");
3082 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3083
3084 size_t extra_size = size + alignment;
3085 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3086
3087 char* aligned_base = NULL;
3088
3089 do {
3090 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3091 if (extra_base == NULL) {
3092 return NULL;
3093 }
3094 // Do manual alignment
3095 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3096
3097 os::release_memory(extra_base, extra_size);
3098
3099 aligned_base = os::reserve_memory(size, aligned_base);
3100
3101 } while (aligned_base == NULL);
3102
3103 return aligned_base;
3104 }
3105
3106 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3107 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3108 "reserve alignment");
3109 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3110 char* res;
3111 // note that if UseLargePages is on, all the areas that require interleaving
3112 // will go thru reserve_memory_special rather than thru here.
3113 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3114 if (!use_individual) {
3115 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3116 } else {
3117 elapsedTimer reserveTimer;
3118 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3119 // in numa interleaving, we have to allocate pages individually
3120 // (well really chunks of NUMAInterleaveGranularity size)
3121 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3122 if (res == NULL) {
3123 warning("NUMA page allocation failed");
3124 }
3125 if( Verbose && PrintMiscellaneous ) {
3126 reserveTimer.stop();
3127 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3128 reserveTimer.milliseconds(), reserveTimer.ticks());
3129 }
3130 }
3131 assert(res == NULL || addr == NULL || addr == res,
3132 "Unexpected address from reserve.");
3133
3134 return res;
3135 }
3136
3137 // Reserve memory at an arbitrary address, only if that area is
3138 // available (and not reserved for something else).
3139 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3140 // Windows os::reserve_memory() fails of the requested address range is
3141 // not avilable.
3142 return reserve_memory(bytes, requested_addr);
3143 }
3144
3145 size_t os::large_page_size() {
3146 return _large_page_size;
3147 }
3148
3149 bool os::can_commit_large_page_memory() {
3150 // Windows only uses large page memory when the entire region is reserved
3151 // and committed in a single VirtualAlloc() call. This may change in the
3152 // future, but with Windows 2003 it's not possible to commit on demand.
3153 return false;
3154 }
3155
3156 bool os::can_execute_large_page_memory() {
3157 return true;
3158 }
3159
3160 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3161 assert(UseLargePages, "only for large pages");
3162
3163 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3164 return NULL; // Fallback to small pages.
3165 }
3166
3167 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3168 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3169
3170 // with large pages, there are two cases where we need to use Individual Allocation
3171 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3172 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3173 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3174 if (TracePageSizes && Verbose) {
3175 tty->print_cr("Reserving large pages individually.");
3176 }
3177 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3178 if (p_buf == NULL) {
3179 // give an appropriate warning message
3180 if (UseNUMAInterleaving) {
3181 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3182 }
3183 if (UseLargePagesIndividualAllocation) {
3184 warning("Individually allocated large pages failed, "
3185 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3186 }
3187 return NULL;
3188 }
3189
3190 return p_buf;
3191
3192 } else {
3193 if (TracePageSizes && Verbose) {
3194 tty->print_cr("Reserving large pages in a single large chunk.");
3195 }
3196 // normal policy just allocate it all at once
3197 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3198 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3199 if (res != NULL) {
3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_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 //
3500 // Short sleep, direct OS call.
3501 //
3502 // ms = 0, means allow others (if any) to run.
3503 //
3504 void os::naked_short_sleep(jlong ms) {
3505 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3506 Sleep(ms);
3507 }
3508
3509 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3510 void os::infinite_sleep() {
3511 while (true) { // sleep forever ...
3512 Sleep(100000); // ... 100 seconds at a time
3513 }
3514 }
3515
3516 typedef BOOL (WINAPI * STTSignature)(void) ;
3517
3518 os::YieldResult os::NakedYield() {
3519 // Use either SwitchToThread() or Sleep(0)
3520 // Consider passing back the return value from SwitchToThread().
3521 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3522 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3523 } else {
3524 Sleep(0);
3525 }
3526 return os::YIELD_UNKNOWN ;
3527 }
3528
3529 void os::yield() { os::NakedYield(); }
3530
3531 void os::yield_all(int attempts) {
3532 // Yields to all threads, including threads with lower priorities
3533 Sleep(1);
3534 }
3535
3536 // Win32 only gives you access to seven real priorities at a time,
3537 // so we compress Java's ten down to seven. It would be better
3538 // if we dynamically adjusted relative priorities.
3539
3540 int os::java_to_os_priority[CriticalPriority + 1] = {
3541 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3542 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3543 THREAD_PRIORITY_LOWEST, // 2
3544 THREAD_PRIORITY_BELOW_NORMAL, // 3
3545 THREAD_PRIORITY_BELOW_NORMAL, // 4
3546 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3547 THREAD_PRIORITY_NORMAL, // 6
3548 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3549 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3550 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3551 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3552 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3553 };
3554
3555 int prio_policy1[CriticalPriority + 1] = {
3556 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3557 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3558 THREAD_PRIORITY_LOWEST, // 2
3559 THREAD_PRIORITY_BELOW_NORMAL, // 3
3560 THREAD_PRIORITY_BELOW_NORMAL, // 4
3561 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3562 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3563 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3564 THREAD_PRIORITY_HIGHEST, // 8
3565 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3566 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3567 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3568 };
3569
3570 static int prio_init() {
3571 // If ThreadPriorityPolicy is 1, switch tables
3572 if (ThreadPriorityPolicy == 1) {
3573 int i;
3574 for (i = 0; i < CriticalPriority + 1; i++) {
3575 os::java_to_os_priority[i] = prio_policy1[i];
3576 }
3577 }
3578 if (UseCriticalJavaThreadPriority) {
3579 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3580 }
3581 return 0;
3582 }
3583
3584 OSReturn os::set_native_priority(Thread* thread, int priority) {
3585 if (!UseThreadPriorities) return OS_OK;
3586 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3587 return ret ? OS_OK : OS_ERR;
3588 }
3589
3590 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3591 if ( !UseThreadPriorities ) {
3592 *priority_ptr = java_to_os_priority[NormPriority];
3593 return OS_OK;
3594 }
3595 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3596 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3597 assert(false, "GetThreadPriority failed");
3598 return OS_ERR;
3599 }
3600 *priority_ptr = os_prio;
3601 return OS_OK;
3602 }
3603
3604
3605 // Hint to the underlying OS that a task switch would not be good.
3606 // Void return because it's a hint and can fail.
3607 void os::hint_no_preempt() {}
3608
3609 void os::interrupt(Thread* thread) {
3610 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3611 "possibility of dangling Thread pointer");
3612
3613 OSThread* osthread = thread->osthread();
3614 osthread->set_interrupted(true);
3615 // More than one thread can get here with the same value of osthread,
3616 // resulting in multiple notifications. We do, however, want the store
3617 // to interrupted() to be visible to other threads before we post
3618 // the interrupt event.
3619 OrderAccess::release();
3620 SetEvent(osthread->interrupt_event());
3621 // For JSR166: unpark after setting status
3622 if (thread->is_Java_thread())
3623 ((JavaThread*)thread)->parker()->unpark();
3624
3625 ParkEvent * ev = thread->_ParkEvent ;
3626 if (ev != NULL) ev->unpark() ;
3627
3628 }
3629
3630
3631 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3632 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3633 "possibility of dangling Thread pointer");
3634
3635 OSThread* osthread = thread->osthread();
3636 // There is no synchronization between the setting of the interrupt
3637 // and it being cleared here. It is critical - see 6535709 - that
3638 // we only clear the interrupt state, and reset the interrupt event,
3639 // if we are going to report that we were indeed interrupted - else
3640 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3641 // depending on the timing. By checking thread interrupt event to see
3642 // if the thread gets real interrupt thus prevent spurious wakeup.
3643 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3644 if (interrupted && clear_interrupted) {
3645 osthread->set_interrupted(false);
3646 ResetEvent(osthread->interrupt_event());
3647 } // Otherwise leave the interrupted state alone
3648
3649 return interrupted;
3650 }
3651
3652 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3653 ExtendedPC os::get_thread_pc(Thread* thread) {
3654 CONTEXT context;
3655 context.ContextFlags = CONTEXT_CONTROL;
3656 HANDLE handle = thread->osthread()->thread_handle();
3657 #ifdef _M_IA64
3658 assert(0, "Fix get_thread_pc");
3659 return ExtendedPC(NULL);
3660 #else
3661 if (GetThreadContext(handle, &context)) {
3662 #ifdef _M_AMD64
3663 return ExtendedPC((address) context.Rip);
3664 #else
3665 return ExtendedPC((address) context.Eip);
3666 #endif
3667 } else {
3668 return ExtendedPC(NULL);
3669 }
3670 #endif
3671 }
3672
3673 // GetCurrentThreadId() returns DWORD
3674 intx os::current_thread_id() { return GetCurrentThreadId(); }
3675
3676 static int _initial_pid = 0;
3677
3678 int os::current_process_id()
3679 {
3680 return (_initial_pid ? _initial_pid : _getpid());
3681 }
3682
3683 int os::win32::_vm_page_size = 0;
3684 int os::win32::_vm_allocation_granularity = 0;
3685 int os::win32::_processor_type = 0;
3686 // Processor level is not available on non-NT systems, use vm_version instead
3687 int os::win32::_processor_level = 0;
3688 julong os::win32::_physical_memory = 0;
3689 size_t os::win32::_default_stack_size = 0;
3690
3691 intx os::win32::_os_thread_limit = 0;
3692 volatile intx os::win32::_os_thread_count = 0;
3693
3694 bool os::win32::_is_nt = false;
3695 bool os::win32::_is_windows_2003 = false;
3696 bool os::win32::_is_windows_server = false;
3697
3698 void os::win32::initialize_system_info() {
3699 SYSTEM_INFO si;
3700 GetSystemInfo(&si);
3701 _vm_page_size = si.dwPageSize;
3702 _vm_allocation_granularity = si.dwAllocationGranularity;
3703 _processor_type = si.dwProcessorType;
3704 _processor_level = si.wProcessorLevel;
3705 set_processor_count(si.dwNumberOfProcessors);
3706
3707 MEMORYSTATUSEX ms;
3708 ms.dwLength = sizeof(ms);
3709
3710 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3711 // dwMemoryLoad (% of memory in use)
3712 GlobalMemoryStatusEx(&ms);
3713 _physical_memory = ms.ullTotalPhys;
3714
3715 OSVERSIONINFOEX oi;
3716 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3717 GetVersionEx((OSVERSIONINFO*)&oi);
3718 switch(oi.dwPlatformId) {
3719 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3720 case VER_PLATFORM_WIN32_NT:
3721 _is_nt = true;
3722 {
3723 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3724 if (os_vers == 5002) {
3725 _is_windows_2003 = true;
3726 }
3727 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3728 oi.wProductType == VER_NT_SERVER) {
3729 _is_windows_server = true;
3730 }
3731 }
3732 break;
3733 default: fatal("Unknown platform");
3734 }
3735
3736 _default_stack_size = os::current_stack_size();
3737 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3738 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3739 "stack size not a multiple of page size");
3740
3741 initialize_performance_counter();
3742
3743 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3744 // known to deadlock the system, if the VM issues to thread operations with
3745 // a too high frequency, e.g., such as changing the priorities.
3746 // The 6000 seems to work well - no deadlocks has been notices on the test
3747 // programs that we have seen experience this problem.
3748 if (!os::win32::is_nt()) {
3749 StarvationMonitorInterval = 6000;
3750 }
3751 }
3752
3753
3754 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3755 char path[MAX_PATH];
3756 DWORD size;
3757 DWORD pathLen = (DWORD)sizeof(path);
3758 HINSTANCE result = NULL;
3759
3760 // only allow library name without path component
3761 assert(strchr(name, '\\') == NULL, "path not allowed");
3762 assert(strchr(name, ':') == NULL, "path not allowed");
3763 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3764 jio_snprintf(ebuf, ebuflen,
3765 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3766 return NULL;
3767 }
3768
3769 // search system directory
3770 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3771 strcat(path, "\\");
3772 strcat(path, name);
3773 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3774 return result;
3775 }
3776 }
3777
3778 // try Windows directory
3779 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3780 strcat(path, "\\");
3781 strcat(path, name);
3782 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3783 return result;
3784 }
3785 }
3786
3787 jio_snprintf(ebuf, ebuflen,
3788 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3789 return NULL;
3790 }
3791
3792 void os::win32::setmode_streams() {
3793 _setmode(_fileno(stdin), _O_BINARY);
3794 _setmode(_fileno(stdout), _O_BINARY);
3795 _setmode(_fileno(stderr), _O_BINARY);
3796 }
3797
3798
3799 bool os::is_debugger_attached() {
3800 return IsDebuggerPresent() ? true : false;
3801 }
3802
3803
3804 void os::wait_for_keypress_at_exit(void) {
3805 if (PauseAtExit) {
3806 fprintf(stderr, "Press any key to continue...\n");
3807 fgetc(stdin);
3808 }
3809 }
3810
3811
3812 int os::message_box(const char* title, const char* message) {
3813 int result = MessageBox(NULL, message, title,
3814 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3815 return result == IDYES;
3816 }
3817
3818 int os::allocate_thread_local_storage() {
3819 return TlsAlloc();
3820 }
3821
3822
3823 void os::free_thread_local_storage(int index) {
3824 TlsFree(index);
3825 }
3826
3827
3828 void os::thread_local_storage_at_put(int index, void* value) {
3829 TlsSetValue(index, value);
3830 assert(thread_local_storage_at(index) == value, "Just checking");
3831 }
3832
3833
3834 void* os::thread_local_storage_at(int index) {
3835 return TlsGetValue(index);
3836 }
3837
3838
3839 #ifndef PRODUCT
3840 #ifndef _WIN64
3841 // Helpers to check whether NX protection is enabled
3842 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3843 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3844 pex->ExceptionRecord->NumberParameters > 0 &&
3845 pex->ExceptionRecord->ExceptionInformation[0] ==
3846 EXCEPTION_INFO_EXEC_VIOLATION) {
3847 return EXCEPTION_EXECUTE_HANDLER;
3848 }
3849 return EXCEPTION_CONTINUE_SEARCH;
3850 }
3851
3852 void nx_check_protection() {
3853 // If NX is enabled we'll get an exception calling into code on the stack
3854 char code[] = { (char)0xC3 }; // ret
3855 void *code_ptr = (void *)code;
3856 __try {
3857 __asm call code_ptr
3858 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3859 tty->print_raw_cr("NX protection detected.");
3860 }
3861 }
3862 #endif // _WIN64
3863 #endif // PRODUCT
3864
3865 // this is called _before_ the global arguments have been parsed
3866 void os::init(void) {
3867 _initial_pid = _getpid();
3868
3869 init_random(1234567);
3870
3871 win32::initialize_system_info();
3872 win32::setmode_streams();
3873 init_page_sizes((size_t) win32::vm_page_size());
3874
3875 // For better scalability on MP systems (must be called after initialize_system_info)
3876 #ifndef PRODUCT
3877 if (is_MP()) {
3878 NoYieldsInMicrolock = true;
3879 }
3880 #endif
3881 // This may be overridden later when argument processing is done.
3882 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3883 os::win32::is_windows_2003());
3884
3885 // Initialize main_process and main_thread
3886 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3887 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3888 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3889 fatal("DuplicateHandle failed\n");
3890 }
3891 main_thread_id = (int) GetCurrentThreadId();
3892 }
3893
3894 // To install functions for atexit processing
3895 extern "C" {
3896 static void perfMemory_exit_helper() {
3897 perfMemory_exit();
3898 }
3899 }
3900
3901 static jint initSock();
3902
3903 // this is called _after_ the global arguments have been parsed
3904 jint os::init_2(void) {
3905 // Allocate a single page and mark it as readable for safepoint polling
3906 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3907 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3908
3909 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3910 guarantee( return_page != NULL, "Commit Failed for polling page");
3911
3912 os::set_polling_page( polling_page );
3913
3914 #ifndef PRODUCT
3915 if( Verbose && PrintMiscellaneous )
3916 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3917 #endif
3918
3919 if (!UseMembar) {
3920 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3921 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3922
3923 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3924 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3925
3926 os::set_memory_serialize_page( mem_serialize_page );
3927
3928 #ifndef PRODUCT
3929 if(Verbose && PrintMiscellaneous)
3930 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3931 #endif
3932 }
3933
3934 // Setup Windows Exceptions
3935
3936 // for debugging float code generation bugs
3937 if (ForceFloatExceptions) {
3938 #ifndef _WIN64
3939 static long fp_control_word = 0;
3940 __asm { fstcw fp_control_word }
3941 // see Intel PPro Manual, Vol. 2, p 7-16
3942 const long precision = 0x20;
3943 const long underflow = 0x10;
3944 const long overflow = 0x08;
3945 const long zero_div = 0x04;
3946 const long denorm = 0x02;
3947 const long invalid = 0x01;
3948 fp_control_word |= invalid;
3949 __asm { fldcw fp_control_word }
3950 #endif
3951 }
3952
3953 // If stack_commit_size is 0, windows will reserve the default size,
3954 // but only commit a small portion of it.
3955 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3956 size_t default_reserve_size = os::win32::default_stack_size();
3957 size_t actual_reserve_size = stack_commit_size;
3958 if (stack_commit_size < default_reserve_size) {
3959 // If stack_commit_size == 0, we want this too
3960 actual_reserve_size = default_reserve_size;
3961 }
3962
3963 // Check minimum allowable stack size for thread creation and to initialize
3964 // the java system classes, including StackOverflowError - depends on page
3965 // size. Add a page for compiler2 recursion in main thread.
3966 // Add in 2*BytesPerWord times page size to account for VM stack during
3967 // class initialization depending on 32 or 64 bit VM.
3968 size_t min_stack_allowed =
3969 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3970 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3971 if (actual_reserve_size < min_stack_allowed) {
3972 tty->print_cr("\nThe stack size specified is too small, "
3973 "Specify at least %dk",
3974 min_stack_allowed / K);
3975 return JNI_ERR;
3976 }
3977
3978 JavaThread::set_stack_size_at_create(stack_commit_size);
3979
3980 // Calculate theoretical max. size of Threads to guard gainst artifical
3981 // out-of-memory situations, where all available address-space has been
3982 // reserved by thread stacks.
3983 assert(actual_reserve_size != 0, "Must have a stack");
3984
3985 // Calculate the thread limit when we should start doing Virtual Memory
3986 // banging. Currently when the threads will have used all but 200Mb of space.
3987 //
3988 // TODO: consider performing a similar calculation for commit size instead
3989 // as reserve size, since on a 64-bit platform we'll run into that more
3990 // often than running out of virtual memory space. We can use the
3991 // lower value of the two calculations as the os_thread_limit.
3992 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3993 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3994
3995 // at exit methods are called in the reverse order of their registration.
3996 // there is no limit to the number of functions registered. atexit does
3997 // not set errno.
3998
3999 if (PerfAllowAtExitRegistration) {
4000 // only register atexit functions if PerfAllowAtExitRegistration is set.
4001 // atexit functions can be delayed until process exit time, which
4002 // can be problematic for embedded VM situations. Embedded VMs should
4003 // call DestroyJavaVM() to assure that VM resources are released.
4004
4005 // note: perfMemory_exit_helper atexit function may be removed in
4006 // the future if the appropriate cleanup code can be added to the
4007 // VM_Exit VMOperation's doit method.
4008 if (atexit(perfMemory_exit_helper) != 0) {
4009 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4010 }
4011 }
4012
4013 #ifndef _WIN64
4014 // Print something if NX is enabled (win32 on AMD64)
4015 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4016 #endif
4017
4018 // initialize thread priority policy
4019 prio_init();
4020
4021 if (UseNUMA && !ForceNUMA) {
4022 UseNUMA = false; // We don't fully support this yet
4023 }
4024
4025 if (UseNUMAInterleaving) {
4026 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4027 bool success = numa_interleaving_init();
4028 if (!success) UseNUMAInterleaving = false;
4029 }
4030
4031 if (initSock() != JNI_OK) {
4032 return JNI_ERR;
4033 }
4034
4035 return JNI_OK;
4036 }
4037
4038 void os::init_3(void) {
4039 return;
4040 }
4041
4042 // Mark the polling page as unreadable
4043 void os::make_polling_page_unreadable(void) {
4044 DWORD old_status;
4045 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4046 fatal("Could not disable polling page");
4047 };
4048
4049 // Mark the polling page as readable
4050 void os::make_polling_page_readable(void) {
4051 DWORD old_status;
4052 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4053 fatal("Could not enable polling page");
4054 };
4055
4056
4057 int os::stat(const char *path, struct stat *sbuf) {
4058 char pathbuf[MAX_PATH];
4059 if (strlen(path) > MAX_PATH - 1) {
4060 errno = ENAMETOOLONG;
4061 return -1;
4062 }
4063 os::native_path(strcpy(pathbuf, path));
4064 int ret = ::stat(pathbuf, sbuf);
4065 if (sbuf != NULL && UseUTCFileTimestamp) {
4066 // Fix for 6539723. st_mtime returned from stat() is dependent on
4067 // the system timezone and so can return different values for the
4068 // same file if/when daylight savings time changes. This adjustment
4069 // makes sure the same timestamp is returned regardless of the TZ.
4070 //
4071 // See:
4072 // http://msdn.microsoft.com/library/
4073 // default.asp?url=/library/en-us/sysinfo/base/
4074 // time_zone_information_str.asp
4075 // and
4076 // http://msdn.microsoft.com/library/default.asp?url=
4077 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4078 //
4079 // NOTE: there is a insidious bug here: If the timezone is changed
4080 // after the call to stat() but before 'GetTimeZoneInformation()', then
4081 // the adjustment we do here will be wrong and we'll return the wrong
4082 // value (which will likely end up creating an invalid class data
4083 // archive). Absent a better API for this, or some time zone locking
4084 // mechanism, we'll have to live with this risk.
4085 TIME_ZONE_INFORMATION tz;
4086 DWORD tzid = GetTimeZoneInformation(&tz);
4087 int daylightBias =
4088 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4089 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4090 }
4091 return ret;
4092 }
4093
4094
4095 #define FT2INT64(ft) \
4096 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4097
4098
4099 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4100 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4101 // of a thread.
4102 //
4103 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4104 // the fast estimate available on the platform.
4105
4106 // current_thread_cpu_time() is not optimized for Windows yet
4107 jlong os::current_thread_cpu_time() {
4108 // return user + sys since the cost is the same
4109 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4110 }
4111
4112 jlong os::thread_cpu_time(Thread* thread) {
4113 // consistent with what current_thread_cpu_time() returns.
4114 return os::thread_cpu_time(thread, true /* user+sys */);
4115 }
4116
4117 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4118 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4119 }
4120
4121 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4122 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4123 // If this function changes, os::is_thread_cpu_time_supported() should too
4124 if (os::win32::is_nt()) {
4125 FILETIME CreationTime;
4126 FILETIME ExitTime;
4127 FILETIME KernelTime;
4128 FILETIME UserTime;
4129
4130 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4131 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4132 return -1;
4133 else
4134 if (user_sys_cpu_time) {
4135 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4136 } else {
4137 return FT2INT64(UserTime) * 100;
4138 }
4139 } else {
4140 return (jlong) timeGetTime() * 1000000;
4141 }
4142 }
4143
4144 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4145 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4146 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4147 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4148 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4149 }
4150
4151 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4152 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4153 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4154 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4155 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4156 }
4157
4158 bool os::is_thread_cpu_time_supported() {
4159 // see os::thread_cpu_time
4160 if (os::win32::is_nt()) {
4161 FILETIME CreationTime;
4162 FILETIME ExitTime;
4163 FILETIME KernelTime;
4164 FILETIME UserTime;
4165
4166 if ( GetThreadTimes(GetCurrentThread(),
4167 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4168 return false;
4169 else
4170 return true;
4171 } else {
4172 return false;
4173 }
4174 }
4175
4176 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4177 // It does have primitives (PDH API) to get CPU usage and run queue length.
4178 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4179 // If we wanted to implement loadavg on Windows, we have a few options:
4180 //
4181 // a) Query CPU usage and run queue length and "fake" an answer by
4182 // returning the CPU usage if it's under 100%, and the run queue
4183 // length otherwise. It turns out that querying is pretty slow
4184 // on Windows, on the order of 200 microseconds on a fast machine.
4185 // Note that on the Windows the CPU usage value is the % usage
4186 // since the last time the API was called (and the first call
4187 // returns 100%), so we'd have to deal with that as well.
4188 //
4189 // b) Sample the "fake" answer using a sampling thread and store
4190 // the answer in a global variable. The call to loadavg would
4191 // just return the value of the global, avoiding the slow query.
4192 //
4193 // c) Sample a better answer using exponential decay to smooth the
4194 // value. This is basically the algorithm used by UNIX kernels.
4195 //
4196 // Note that sampling thread starvation could affect both (b) and (c).
4197 int os::loadavg(double loadavg[], int nelem) {
4198 return -1;
4199 }
4200
4201
4202 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4203 bool os::dont_yield() {
4204 return DontYieldALot;
4205 }
4206
4207 // This method is a slightly reworked copy of JDK's sysOpen
4208 // from src/windows/hpi/src/sys_api_md.c
4209
4210 int os::open(const char *path, int oflag, int mode) {
4211 char pathbuf[MAX_PATH];
4212
4213 if (strlen(path) > MAX_PATH - 1) {
4214 errno = ENAMETOOLONG;
4215 return -1;
4216 }
4217 os::native_path(strcpy(pathbuf, path));
4218 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4219 }
4220
4221 FILE* os::open(int fd, const char* mode) {
4222 return ::_fdopen(fd, mode);
4223 }
4224
4225 // Is a (classpath) directory empty?
4226 bool os::dir_is_empty(const char* path) {
4227 WIN32_FIND_DATA fd;
4228 HANDLE f = FindFirstFile(path, &fd);
4229 if (f == INVALID_HANDLE_VALUE) {
4230 return true;
4231 }
4232 FindClose(f);
4233 return false;
4234 }
4235
4236 // create binary file, rewriting existing file if required
4237 int os::create_binary_file(const char* path, bool rewrite_existing) {
4238 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4239 if (!rewrite_existing) {
4240 oflags |= _O_EXCL;
4241 }
4242 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4243 }
4244
4245 // return current position of file pointer
4246 jlong os::current_file_offset(int fd) {
4247 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4248 }
4249
4250 // move file pointer to the specified offset
4251 jlong os::seek_to_file_offset(int fd, jlong offset) {
4252 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4253 }
4254
4255
4256 jlong os::lseek(int fd, jlong offset, int whence) {
4257 return (jlong) ::_lseeki64(fd, offset, whence);
4258 }
4259
4260 // This method is a slightly reworked copy of JDK's sysNativePath
4261 // from src/windows/hpi/src/path_md.c
4262
4263 /* Convert a pathname to native format. On win32, this involves forcing all
4264 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4265 sometimes rejects '/') and removing redundant separators. The input path is
4266 assumed to have been converted into the character encoding used by the local
4267 system. Because this might be a double-byte encoding, care is taken to
4268 treat double-byte lead characters correctly.
4269
4270 This procedure modifies the given path in place, as the result is never
4271 longer than the original. There is no error return; this operation always
4272 succeeds. */
4273 char * os::native_path(char *path) {
4274 char *src = path, *dst = path, *end = path;
4275 char *colon = NULL; /* If a drive specifier is found, this will
4276 point to the colon following the drive
4277 letter */
4278
4279 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4280 assert(((!::IsDBCSLeadByte('/'))
4281 && (!::IsDBCSLeadByte('\\'))
4282 && (!::IsDBCSLeadByte(':'))),
4283 "Illegal lead byte");
4284
4285 /* Check for leading separators */
4286 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4287 while (isfilesep(*src)) {
4288 src++;
4289 }
4290
4291 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4292 /* Remove leading separators if followed by drive specifier. This
4293 hack is necessary to support file URLs containing drive
4294 specifiers (e.g., "file://c:/path"). As a side effect,
4295 "/c:/path" can be used as an alternative to "c:/path". */
4296 *dst++ = *src++;
4297 colon = dst;
4298 *dst++ = ':';
4299 src++;
4300 } else {
4301 src = path;
4302 if (isfilesep(src[0]) && isfilesep(src[1])) {
4303 /* UNC pathname: Retain first separator; leave src pointed at
4304 second separator so that further separators will be collapsed
4305 into the second separator. The result will be a pathname
4306 beginning with "\\\\" followed (most likely) by a host name. */
4307 src = dst = path + 1;
4308 path[0] = '\\'; /* Force first separator to '\\' */
4309 }
4310 }
4311
4312 end = dst;
4313
4314 /* Remove redundant separators from remainder of path, forcing all
4315 separators to be '\\' rather than '/'. Also, single byte space
4316 characters are removed from the end of the path because those
4317 are not legal ending characters on this operating system.
4318 */
4319 while (*src != '\0') {
4320 if (isfilesep(*src)) {
4321 *dst++ = '\\'; src++;
4322 while (isfilesep(*src)) src++;
4323 if (*src == '\0') {
4324 /* Check for trailing separator */
4325 end = dst;
4326 if (colon == dst - 2) break; /* "z:\\" */
4327 if (dst == path + 1) break; /* "\\" */
4328 if (dst == path + 2 && isfilesep(path[0])) {
4329 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4330 beginning of a UNC pathname. Even though it is not, by
4331 itself, a valid UNC pathname, we leave it as is in order
4332 to be consistent with the path canonicalizer as well
4333 as the win32 APIs, which treat this case as an invalid
4334 UNC pathname rather than as an alias for the root
4335 directory of the current drive. */
4336 break;
4337 }
4338 end = --dst; /* Path does not denote a root directory, so
4339 remove trailing separator */
4340 break;
4341 }
4342 end = dst;
4343 } else {
4344 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4345 *dst++ = *src++;
4346 if (*src) *dst++ = *src++;
4347 end = dst;
4348 } else { /* Copy a single-byte character */
4349 char c = *src++;
4350 *dst++ = c;
4351 /* Space is not a legal ending character */
4352 if (c != ' ') end = dst;
4353 }
4354 }
4355 }
4356
4357 *end = '\0';
4358
4359 /* For "z:", add "." to work around a bug in the C runtime library */
4360 if (colon == dst - 1) {
4361 path[2] = '.';
4362 path[3] = '\0';
4363 }
4364
4365 return path;
4366 }
4367
4368 // This code is a copy of JDK's sysSetLength
4369 // from src/windows/hpi/src/sys_api_md.c
4370
4371 int os::ftruncate(int fd, jlong length) {
4372 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4373 long high = (long)(length >> 32);
4374 DWORD ret;
4375
4376 if (h == (HANDLE)(-1)) {
4377 return -1;
4378 }
4379
4380 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4381 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4382 return -1;
4383 }
4384
4385 if (::SetEndOfFile(h) == FALSE) {
4386 return -1;
4387 }
4388
4389 return 0;
4390 }
4391
4392
4393 // This code is a copy of JDK's sysSync
4394 // from src/windows/hpi/src/sys_api_md.c
4395 // except for the legacy workaround for a bug in Win 98
4396
4397 int os::fsync(int fd) {
4398 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4399
4400 if ( (!::FlushFileBuffers(handle)) &&
4401 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4402 /* from winerror.h */
4403 return -1;
4404 }
4405 return 0;
4406 }
4407
4408 static int nonSeekAvailable(int, long *);
4409 static int stdinAvailable(int, long *);
4410
4411 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4412 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4413
4414 // This code is a copy of JDK's sysAvailable
4415 // from src/windows/hpi/src/sys_api_md.c
4416
4417 int os::available(int fd, jlong *bytes) {
4418 jlong cur, end;
4419 struct _stati64 stbuf64;
4420
4421 if (::_fstati64(fd, &stbuf64) >= 0) {
4422 int mode = stbuf64.st_mode;
4423 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4424 int ret;
4425 long lpbytes;
4426 if (fd == 0) {
4427 ret = stdinAvailable(fd, &lpbytes);
4428 } else {
4429 ret = nonSeekAvailable(fd, &lpbytes);
4430 }
4431 (*bytes) = (jlong)(lpbytes);
4432 return ret;
4433 }
4434 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4435 return FALSE;
4436 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4437 return FALSE;
4438 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4439 return FALSE;
4440 }
4441 *bytes = end - cur;
4442 return TRUE;
4443 } else {
4444 return FALSE;
4445 }
4446 }
4447
4448 // This code is a copy of JDK's nonSeekAvailable
4449 // from src/windows/hpi/src/sys_api_md.c
4450
4451 static int nonSeekAvailable(int fd, long *pbytes) {
4452 /* This is used for available on non-seekable devices
4453 * (like both named and anonymous pipes, such as pipes
4454 * connected to an exec'd process).
4455 * Standard Input is a special case.
4456 *
4457 */
4458 HANDLE han;
4459
4460 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4461 return FALSE;
4462 }
4463
4464 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4465 /* PeekNamedPipe fails when at EOF. In that case we
4466 * simply make *pbytes = 0 which is consistent with the
4467 * behavior we get on Solaris when an fd is at EOF.
4468 * The only alternative is to raise an Exception,
4469 * which isn't really warranted.
4470 */
4471 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4472 return FALSE;
4473 }
4474 *pbytes = 0;
4475 }
4476 return TRUE;
4477 }
4478
4479 #define MAX_INPUT_EVENTS 2000
4480
4481 // This code is a copy of JDK's stdinAvailable
4482 // from src/windows/hpi/src/sys_api_md.c
4483
4484 static int stdinAvailable(int fd, long *pbytes) {
4485 HANDLE han;
4486 DWORD numEventsRead = 0; /* Number of events read from buffer */
4487 DWORD numEvents = 0; /* Number of events in buffer */
4488 DWORD i = 0; /* Loop index */
4489 DWORD curLength = 0; /* Position marker */
4490 DWORD actualLength = 0; /* Number of bytes readable */
4491 BOOL error = FALSE; /* Error holder */
4492 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4493
4494 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4495 return FALSE;
4496 }
4497
4498 /* Construct an array of input records in the console buffer */
4499 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4500 if (error == 0) {
4501 return nonSeekAvailable(fd, pbytes);
4502 }
4503
4504 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4505 if (numEvents > MAX_INPUT_EVENTS) {
4506 numEvents = MAX_INPUT_EVENTS;
4507 }
4508
4509 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4510 if (lpBuffer == NULL) {
4511 return FALSE;
4512 }
4513
4514 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4515 if (error == 0) {
4516 os::free(lpBuffer, mtInternal);
4517 return FALSE;
4518 }
4519
4520 /* Examine input records for the number of bytes available */
4521 for(i=0; i<numEvents; i++) {
4522 if (lpBuffer[i].EventType == KEY_EVENT) {
4523
4524 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4525 &(lpBuffer[i].Event);
4526 if (keyRecord->bKeyDown == TRUE) {
4527 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4528 curLength++;
4529 if (*keyPressed == '\r') {
4530 actualLength = curLength;
4531 }
4532 }
4533 }
4534 }
4535
4536 if(lpBuffer != NULL) {
4537 os::free(lpBuffer, mtInternal);
4538 }
4539
4540 *pbytes = (long) actualLength;
4541 return TRUE;
4542 }
4543
4544 // Map a block of memory.
4545 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4546 char *addr, size_t bytes, bool read_only,
4547 bool allow_exec) {
4548 HANDLE hFile;
4549 char* base;
4550
4551 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4552 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4553 if (hFile == NULL) {
4554 if (PrintMiscellaneous && Verbose) {
4555 DWORD err = GetLastError();
4556 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4557 }
4558 return NULL;
4559 }
4560
4561 if (allow_exec) {
4562 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4563 // unless it comes from a PE image (which the shared archive is not.)
4564 // Even VirtualProtect refuses to give execute access to mapped memory
4565 // that was not previously executable.
4566 //
4567 // Instead, stick the executable region in anonymous memory. Yuck.
4568 // Penalty is that ~4 pages will not be shareable - in the future
4569 // we might consider DLLizing the shared archive with a proper PE
4570 // header so that mapping executable + sharing is possible.
4571
4572 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4573 PAGE_READWRITE);
4574 if (base == NULL) {
4575 if (PrintMiscellaneous && Verbose) {
4576 DWORD err = GetLastError();
4577 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4578 }
4579 CloseHandle(hFile);
4580 return NULL;
4581 }
4582
4583 DWORD bytes_read;
4584 OVERLAPPED overlapped;
4585 overlapped.Offset = (DWORD)file_offset;
4586 overlapped.OffsetHigh = 0;
4587 overlapped.hEvent = NULL;
4588 // ReadFile guarantees that if the return value is true, the requested
4589 // number of bytes were read before returning.
4590 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4591 if (!res) {
4592 if (PrintMiscellaneous && Verbose) {
4593 DWORD err = GetLastError();
4594 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4595 }
4596 release_memory(base, bytes);
4597 CloseHandle(hFile);
4598 return NULL;
4599 }
4600 } else {
4601 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4602 NULL /*file_name*/);
4603 if (hMap == NULL) {
4604 if (PrintMiscellaneous && Verbose) {
4605 DWORD err = GetLastError();
4606 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4607 }
4608 CloseHandle(hFile);
4609 return NULL;
4610 }
4611
4612 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4613 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4614 (DWORD)bytes, addr);
4615 if (base == NULL) {
4616 if (PrintMiscellaneous && Verbose) {
4617 DWORD err = GetLastError();
4618 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4619 }
4620 CloseHandle(hMap);
4621 CloseHandle(hFile);
4622 return NULL;
4623 }
4624
4625 if (CloseHandle(hMap) == 0) {
4626 if (PrintMiscellaneous && Verbose) {
4627 DWORD err = GetLastError();
4628 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4629 }
4630 CloseHandle(hFile);
4631 return base;
4632 }
4633 }
4634
4635 if (allow_exec) {
4636 DWORD old_protect;
4637 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4638 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4639
4640 if (!res) {
4641 if (PrintMiscellaneous && Verbose) {
4642 DWORD err = GetLastError();
4643 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4644 }
4645 // Don't consider this a hard error, on IA32 even if the
4646 // VirtualProtect fails, we should still be able to execute
4647 CloseHandle(hFile);
4648 return base;
4649 }
4650 }
4651
4652 if (CloseHandle(hFile) == 0) {
4653 if (PrintMiscellaneous && Verbose) {
4654 DWORD err = GetLastError();
4655 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4656 }
4657 return base;
4658 }
4659
4660 return base;
4661 }
4662
4663
4664 // Remap a block of memory.
4665 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4666 char *addr, size_t bytes, bool read_only,
4667 bool allow_exec) {
4668 // This OS does not allow existing memory maps to be remapped so we
4669 // have to unmap the memory before we remap it.
4670 if (!os::unmap_memory(addr, bytes)) {
4671 return NULL;
4672 }
4673
4674 // There is a very small theoretical window between the unmap_memory()
4675 // call above and the map_memory() call below where a thread in native
4676 // code may be able to access an address that is no longer mapped.
4677
4678 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4679 read_only, allow_exec);
4680 }
4681
4682
4683 // Unmap a block of memory.
4684 // Returns true=success, otherwise false.
4685
4686 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4687 BOOL result = UnmapViewOfFile(addr);
4688 if (result == 0) {
4689 if (PrintMiscellaneous && Verbose) {
4690 DWORD err = GetLastError();
4691 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4692 }
4693 return false;
4694 }
4695 return true;
4696 }
4697
4698 void os::pause() {
4699 char filename[MAX_PATH];
4700 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4701 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4702 } else {
4703 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4704 }
4705
4706 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4707 if (fd != -1) {
4708 struct stat buf;
4709 ::close(fd);
4710 while (::stat(filename, &buf) == 0) {
4711 Sleep(100);
4712 }
4713 } else {
4714 jio_fprintf(stderr,
4715 "Could not open pause file '%s', continuing immediately.\n", filename);
4716 }
4717 }
4718
4719 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4720 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4721 }
4722
4723 /*
4724 * See the caveats for this class in os_windows.hpp
4725 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4726 * into this method and returns false. If no OS EXCEPTION was raised, returns
4727 * true.
4728 * The callback is supposed to provide the method that should be protected.
4729 */
4730 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4731 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4732 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4733 "crash_protection already set?");
4734
4735 bool success = true;
4736 __try {
4737 WatcherThread::watcher_thread()->set_crash_protection(this);
4738 cb.call();
4739 } __except(EXCEPTION_EXECUTE_HANDLER) {
4740 // only for protection, nothing to do
4741 success = false;
4742 }
4743 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4744 return success;
4745 }
4746
4747 // An Event wraps a win32 "CreateEvent" kernel handle.
4748 //
4749 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4750 //
4751 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4752 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4753 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4754 // In addition, an unpark() operation might fetch the handle field, but the
4755 // event could recycle between the fetch and the SetEvent() operation.
4756 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4757 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4758 // on an stale but recycled handle would be harmless, but in practice this might
4759 // confuse other non-Sun code, so it's not a viable approach.
4760 //
4761 // 2: Once a win32 event handle is associated with an Event, it remains associated
4762 // with the Event. The event handle is never closed. This could be construed
4763 // as handle leakage, but only up to the maximum # of threads that have been extant
4764 // at any one time. This shouldn't be an issue, as windows platforms typically
4765 // permit a process to have hundreds of thousands of open handles.
4766 //
4767 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4768 // and release unused handles.
4769 //
4770 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4771 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4772 //
4773 // 5. Use an RCU-like mechanism (Read-Copy Update).
4774 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4775 //
4776 // We use (2).
4777 //
4778 // TODO-FIXME:
4779 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4780 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4781 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4782 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4783 // into a single win32 CreateEvent() handle.
4784 //
4785 // _Event transitions in park()
4786 // -1 => -1 : illegal
4787 // 1 => 0 : pass - return immediately
4788 // 0 => -1 : block
4789 //
4790 // _Event serves as a restricted-range semaphore :
4791 // -1 : thread is blocked
4792 // 0 : neutral - thread is running or ready
4793 // 1 : signaled - thread is running or ready
4794 //
4795 // Another possible encoding of _Event would be
4796 // with explicit "PARKED" and "SIGNALED" bits.
4797
4798 int os::PlatformEvent::park (jlong Millis) {
4799 guarantee (_ParkHandle != NULL , "Invariant") ;
4800 guarantee (Millis > 0 , "Invariant") ;
4801 int v ;
4802
4803 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4804 // the initial park() operation.
4805
4806 for (;;) {
4807 v = _Event ;
4808 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4809 }
4810 guarantee ((v == 0) || (v == 1), "invariant") ;
4811 if (v != 0) return OS_OK ;
4812
4813 // Do this the hard way by blocking ...
4814 // TODO: consider a brief spin here, gated on the success of recent
4815 // spin attempts by this thread.
4816 //
4817 // We decompose long timeouts into series of shorter timed waits.
4818 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4819 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4820 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4821 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4822 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4823 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4824 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4825 // for the already waited time. This policy does not admit any new outcomes.
4826 // In the future, however, we might want to track the accumulated wait time and
4827 // adjust Millis accordingly if we encounter a spurious wakeup.
4828
4829 const int MAXTIMEOUT = 0x10000000 ;
4830 DWORD rv = WAIT_TIMEOUT ;
4831 while (_Event < 0 && Millis > 0) {
4832 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4833 if (Millis > MAXTIMEOUT) {
4834 prd = MAXTIMEOUT ;
4835 }
4836 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4837 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4838 if (rv == WAIT_TIMEOUT) {
4839 Millis -= prd ;
4840 }
4841 }
4842 v = _Event ;
4843 _Event = 0 ;
4844 // see comment at end of os::PlatformEvent::park() below:
4845 OrderAccess::fence() ;
4846 // If we encounter a nearly simultanous timeout expiry and unpark()
4847 // we return OS_OK indicating we awoke via unpark().
4848 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4849 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4850 }
4851
4852 void os::PlatformEvent::park () {
4853 guarantee (_ParkHandle != NULL, "Invariant") ;
4854 // Invariant: Only the thread associated with the Event/PlatformEvent
4855 // may call park().
4856 int v ;
4857 for (;;) {
4858 v = _Event ;
4859 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4860 }
4861 guarantee ((v == 0) || (v == 1), "invariant") ;
4862 if (v != 0) return ;
4863
4864 // Do this the hard way by blocking ...
4865 // TODO: consider a brief spin here, gated on the success of recent
4866 // spin attempts by this thread.
4867 while (_Event < 0) {
4868 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4869 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4870 }
4871
4872 // Usually we'll find _Event == 0 at this point, but as
4873 // an optional optimization we clear it, just in case can
4874 // multiple unpark() operations drove _Event up to 1.
4875 _Event = 0 ;
4876 OrderAccess::fence() ;
4877 guarantee (_Event >= 0, "invariant") ;
4878 }
4879
4880 void os::PlatformEvent::unpark() {
4881 guarantee (_ParkHandle != NULL, "Invariant") ;
4882
4883 // Transitions for _Event:
4884 // 0 :=> 1
4885 // 1 :=> 1
4886 // -1 :=> either 0 or 1; must signal target thread
4887 // That is, we can safely transition _Event from -1 to either
4888 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4889 // unpark() calls.
4890 // See also: "Semaphores in Plan 9" by Mullender & Cox
4891 //
4892 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4893 // that it will take two back-to-back park() calls for the owning
4894 // thread to block. This has the benefit of forcing a spurious return
4895 // from the first park() call after an unpark() call which will help
4896 // shake out uses of park() and unpark() without condition variables.
4897
4898 if (Atomic::xchg(1, &_Event) >= 0) return;
4899
4900 ::SetEvent(_ParkHandle);
4901 }
4902
4903
4904 // JSR166
4905 // -------------------------------------------------------
4906
4907 /*
4908 * The Windows implementation of Park is very straightforward: Basic
4909 * operations on Win32 Events turn out to have the right semantics to
4910 * use them directly. We opportunistically resuse the event inherited
4911 * from Monitor.
4912 */
4913
4914
4915 void Parker::park(bool isAbsolute, jlong time) {
4916 guarantee (_ParkEvent != NULL, "invariant") ;
4917 // First, demultiplex/decode time arguments
4918 if (time < 0) { // don't wait
4919 return;
4920 }
4921 else if (time == 0 && !isAbsolute) {
4922 time = INFINITE;
4923 }
4924 else if (isAbsolute) {
4925 time -= os::javaTimeMillis(); // convert to relative time
4926 if (time <= 0) // already elapsed
4927 return;
4928 }
4929 else { // relative
4930 time /= 1000000; // Must coarsen from nanos to millis
4931 if (time == 0) // Wait for the minimal time unit if zero
4932 time = 1;
4933 }
4934
4935 JavaThread* thread = (JavaThread*)(Thread::current());
4936 assert(thread->is_Java_thread(), "Must be JavaThread");
4937 JavaThread *jt = (JavaThread *)thread;
4938
4939 // Don't wait if interrupted or already triggered
4940 if (Thread::is_interrupted(thread, false) ||
4941 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4942 ResetEvent(_ParkEvent);
4943 return;
4944 }
4945 else {
4946 ThreadBlockInVM tbivm(jt);
4947 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4948 jt->set_suspend_equivalent();
4949
4950 WaitForSingleObject(_ParkEvent, time);
4951 ResetEvent(_ParkEvent);
4952
4953 // If externally suspended while waiting, re-suspend
4954 if (jt->handle_special_suspend_equivalent_condition()) {
4955 jt->java_suspend_self();
4956 }
4957 }
4958 }
4959
4960 void Parker::unpark() {
4961 guarantee (_ParkEvent != NULL, "invariant") ;
4962 SetEvent(_ParkEvent);
4963 }
4964
4965 // Run the specified command in a separate process. Return its exit value,
4966 // or -1 on failure (e.g. can't create a new process).
4967 int os::fork_and_exec(char* cmd) {
4968 STARTUPINFO si;
4969 PROCESS_INFORMATION pi;
4970
4971 memset(&si, 0, sizeof(si));
4972 si.cb = sizeof(si);
4973 memset(&pi, 0, sizeof(pi));
4974 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4975 cmd, // command line
4976 NULL, // process security attribute
4977 NULL, // thread security attribute
4978 TRUE, // inherits system handles
4979 0, // no creation flags
4980 NULL, // use parent's environment block
4981 NULL, // use parent's starting directory
4982 &si, // (in) startup information
4983 &pi); // (out) process information
4984
4985 if (rslt) {
4986 // Wait until child process exits.
4987 WaitForSingleObject(pi.hProcess, INFINITE);
4988
4989 DWORD exit_code;
4990 GetExitCodeProcess(pi.hProcess, &exit_code);
4991
4992 // Close process and thread handles.
4993 CloseHandle(pi.hProcess);
4994 CloseHandle(pi.hThread);
4995
4996 return (int)exit_code;
4997 } else {
4998 return -1;
4999 }
5000 }
5001
5002 //--------------------------------------------------------------------------------------------------
5003 // Non-product code
5004
5005 static int mallocDebugIntervalCounter = 0;
5006 static int mallocDebugCounter = 0;
5007 bool os::check_heap(bool force) {
5008 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5009 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5010 // Note: HeapValidate executes two hardware breakpoints when it finds something
5011 // wrong; at these points, eax contains the address of the offending block (I think).
5012 // To get to the exlicit error message(s) below, just continue twice.
5013 HANDLE heap = GetProcessHeap();
5014 { HeapLock(heap);
5015 PROCESS_HEAP_ENTRY phe;
5016 phe.lpData = NULL;
5017 while (HeapWalk(heap, &phe) != 0) {
5018 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5019 !HeapValidate(heap, 0, phe.lpData)) {
5020 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5021 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5022 fatal("corrupted C heap");
5023 }
5024 }
5025 DWORD err = GetLastError();
5026 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5027 fatal(err_msg("heap walk aborted with error %d", err));
5028 }
5029 HeapUnlock(heap);
5030 }
5031 mallocDebugIntervalCounter = 0;
5032 }
5033 return true;
5034 }
5035
5036
5037 bool os::find(address addr, outputStream* st) {
5038 // Nothing yet
5039 return false;
5040 }
5041
5042 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5043 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5044
5045 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5046 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5047 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5048 address addr = (address) exceptionRecord->ExceptionInformation[1];
5049
5050 if (os::is_memory_serialize_page(thread, addr))
5051 return EXCEPTION_CONTINUE_EXECUTION;
5052 }
5053
5054 return EXCEPTION_CONTINUE_SEARCH;
5055 }
5056
5057 // We don't build a headless jre for Windows
5058 bool os::is_headless_jre() { return false; }
5059
5060 static jint initSock() {
5061 WSADATA wsadata;
5062
5063 if (!os::WinSock2Dll::WinSock2Available()) {
5064 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5065 ::GetLastError());
5066 return JNI_ERR;
5067 }
5068
5069 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5070 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5071 ::GetLastError());
5072 return JNI_ERR;
5073 }
5074 return JNI_OK;
5075 }
5076
5077 struct hostent* os::get_host_by_name(char* name) {
5078 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5079 }
5080
5081 int os::socket_close(int fd) {
5082 return ::closesocket(fd);
5083 }
5084
5085 int os::socket_available(int fd, jint *pbytes) {
5086 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5087 return (ret < 0) ? 0 : 1;
5088 }
5089
5090 int os::socket(int domain, int type, int protocol) {
5091 return ::socket(domain, type, protocol);
5092 }
5093
5094 int os::listen(int fd, int count) {
5095 return ::listen(fd, count);
5096 }
5097
5098 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5099 return ::connect(fd, him, len);
5100 }
5101
5102 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5103 return ::accept(fd, him, len);
5104 }
5105
5106 int os::sendto(int fd, char* buf, size_t len, uint flags,
5107 struct sockaddr* to, socklen_t tolen) {
5108
5109 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5110 }
5111
5112 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5113 sockaddr* from, socklen_t* fromlen) {
5114
5115 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5116 }
5117
5118 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5119 return ::recv(fd, buf, (int)nBytes, flags);
5120 }
5121
5122 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5123 return ::send(fd, buf, (int)nBytes, flags);
5124 }
5125
5126 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5127 return ::send(fd, buf, (int)nBytes, flags);
5128 }
5129
5130 int os::timeout(int fd, long timeout) {
5131 fd_set tbl;
5132 struct timeval t;
5133
5134 t.tv_sec = timeout / 1000;
5135 t.tv_usec = (timeout % 1000) * 1000;
5136
5137 tbl.fd_count = 1;
5138 tbl.fd_array[0] = fd;
5139
5140 return ::select(1, &tbl, 0, 0, &t);
5141 }
5142
5143 int os::get_host_name(char* name, int namelen) {
5144 return ::gethostname(name, namelen);
5145 }
5146
5147 int os::socket_shutdown(int fd, int howto) {
5148 return ::shutdown(fd, howto);
5149 }
5150
5151 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5152 return ::bind(fd, him, len);
5153 }
5154
5155 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5156 return ::getsockname(fd, him, len);
5157 }
5158
5159 int os::get_sock_opt(int fd, int level, int optname,
5160 char* optval, socklen_t* optlen) {
5161 return ::getsockopt(fd, level, optname, optval, optlen);
5162 }
5163
5164 int os::set_sock_opt(int fd, int level, int optname,
5165 const char* optval, socklen_t optlen) {
5166 return ::setsockopt(fd, level, optname, optval, optlen);
5167 }
5168
5169 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5170 #if defined(IA32)
5171 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5172 #elif defined (AMD64)
5173 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5174 #endif
5175
5176 // returns true if thread could be suspended,
5177 // false otherwise
5178 static bool do_suspend(HANDLE* h) {
5179 if (h != NULL) {
5180 if (SuspendThread(*h) != ~0) {
5181 return true;
5182 }
5183 }
5184 return false;
5185 }
5186
5187 // resume the thread
5188 // calling resume on an active thread is a no-op
5189 static void do_resume(HANDLE* h) {
5190 if (h != NULL) {
5191 ResumeThread(*h);
5192 }
5193 }
5194
5195 // retrieve a suspend/resume context capable handle
5196 // from the tid. Caller validates handle return value.
5197 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5198 if (h != NULL) {
5199 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5200 }
5201 }
5202
5203 //
5204 // Thread sampling implementation
5205 //
5206 void os::SuspendedThreadTask::internal_do_task() {
5207 CONTEXT ctxt;
5208 HANDLE h = NULL;
5209
5210 // get context capable handle for thread
5211 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5212
5213 // sanity
5214 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5215 return;
5216 }
5217
5218 // suspend the thread
5219 if (do_suspend(&h)) {
5220 ctxt.ContextFlags = sampling_context_flags;
5221 // get thread context
5222 GetThreadContext(h, &ctxt);
5223 SuspendedThreadTaskContext context(_thread, &ctxt);
5224 // pass context to Thread Sampling impl
5225 do_task(context);
5226 // resume thread
5227 do_resume(&h);
5228 }
5229
5230 // close handle
5231 CloseHandle(h);
5232 }
5233
5234
5235 // Kernel32 API
5236 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5237 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5238 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5239 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5240 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5241
5242 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5243 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5244 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5245 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5246 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5247
5248
5249 BOOL os::Kernel32Dll::initialized = FALSE;
5250 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5251 assert(initialized && _GetLargePageMinimum != NULL,
5252 "GetLargePageMinimumAvailable() not yet called");
5253 return _GetLargePageMinimum();
5254 }
5255
5256 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5257 if (!initialized) {
5258 initialize();
5259 }
5260 return _GetLargePageMinimum != NULL;
5261 }
5262
5263 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5264 if (!initialized) {
5265 initialize();
5266 }
5267 return _VirtualAllocExNuma != NULL;
5268 }
5269
5270 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5271 assert(initialized && _VirtualAllocExNuma != NULL,
5272 "NUMACallsAvailable() not yet called");
5273
5274 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5275 }
5276
5277 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5278 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5279 "NUMACallsAvailable() not yet called");
5280
5281 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5282 }
5283
5284 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5285 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5286 "NUMACallsAvailable() not yet called");
5287
5288 return _GetNumaNodeProcessorMask(node, proc_mask);
5289 }
5290
5291 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5292 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5293 if (!initialized) {
5294 initialize();
5295 }
5296
5297 if (_RtlCaptureStackBackTrace != NULL) {
5298 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5299 BackTrace, BackTraceHash);
5300 } else {
5301 return 0;
5302 }
5303 }
5304
5305 void os::Kernel32Dll::initializeCommon() {
5306 if (!initialized) {
5307 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5308 assert(handle != NULL, "Just check");
5309 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5310 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5311 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5312 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5313 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5314 initialized = TRUE;
5315 }
5316 }
5317
5318
5319
5320 #ifndef JDK6_OR_EARLIER
5321
5322 void os::Kernel32Dll::initialize() {
5323 initializeCommon();
5324 }
5325
5326
5327 // Kernel32 API
5328 inline BOOL os::Kernel32Dll::SwitchToThread() {
5329 return ::SwitchToThread();
5330 }
5331
5332 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5333 return true;
5334 }
5335
5336 // Help tools
5337 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5338 return true;
5339 }
5340
5341 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5342 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5343 }
5344
5345 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5346 return ::Module32First(hSnapshot, lpme);
5347 }
5348
5349 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5350 return ::Module32Next(hSnapshot, lpme);
5351 }
5352
5353
5354 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5355 return true;
5356 }
5357
5358 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5359 ::GetNativeSystemInfo(lpSystemInfo);
5360 }
5361
5362 // PSAPI API
5363 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5364 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5365 }
5366
5367 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5368 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5369 }
5370
5371 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5372 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5373 }
5374
5375 inline BOOL os::PSApiDll::PSApiAvailable() {
5376 return true;
5377 }
5378
5379
5380 // WinSock2 API
5381 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5382 return ::WSAStartup(wVersionRequested, lpWSAData);
5383 }
5384
5385 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5386 return ::gethostbyname(name);
5387 }
5388
5389 inline BOOL os::WinSock2Dll::WinSock2Available() {
5390 return true;
5391 }
5392
5393 // Advapi API
5394 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5395 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5396 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5397 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5398 BufferLength, PreviousState, ReturnLength);
5399 }
5400
5401 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5402 PHANDLE TokenHandle) {
5403 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5404 }
5405
5406 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5407 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5408 }
5409
5410 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5411 return true;
5412 }
5413
5414 void* os::get_default_process_handle() {
5415 return (void*)GetModuleHandle(NULL);
5416 }
5417
5418 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5419 // which is used to find statically linked in agents.
5420 // Additionally for windows, takes into account __stdcall names.
5421 // Parameters:
5422 // sym_name: Symbol in library we are looking for
5423 // lib_name: Name of library to look in, NULL for shared libs.
5424 // is_absolute_path == true if lib_name is absolute path to agent
5425 // such as "C:/a/b/L.dll"
5426 // == false if only the base name of the library is passed in
5427 // such as "L"
5428 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5429 bool is_absolute_path) {
5430 char *agent_entry_name;
5431 size_t len;
5432 size_t name_len;
5433 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5434 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5435 const char *start;
5436
5437 if (lib_name != NULL) {
5438 len = name_len = strlen(lib_name);
5439 if (is_absolute_path) {
5440 // Need to strip path, prefix and suffix
5441 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5442 lib_name = ++start;
5443 } else {
5444 // Need to check for drive prefix
5445 if ((start = strchr(lib_name, ':')) != NULL) {
5446 lib_name = ++start;
5447 }
5448 }
5449 if (len <= (prefix_len + suffix_len)) {
5450 return NULL;
5451 }
5452 lib_name += prefix_len;
5453 name_len = strlen(lib_name) - suffix_len;
5454 }
5455 }
5456 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5457 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5458 if (agent_entry_name == NULL) {
5459 return NULL;
5460 }
5461 if (lib_name != NULL) {
5462 const char *p = strrchr(sym_name, '@');
5463 if (p != NULL && p != sym_name) {
5464 // sym_name == _Agent_OnLoad@XX
5465 strncpy(agent_entry_name, sym_name, (p - sym_name));
5466 agent_entry_name[(p-sym_name)] = '\0';
5467 // agent_entry_name == _Agent_OnLoad
5468 strcat(agent_entry_name, "_");
5469 strncat(agent_entry_name, lib_name, name_len);
5470 strcat(agent_entry_name, p);
5471 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5472 } else {
5473 strcpy(agent_entry_name, sym_name);
5474 strcat(agent_entry_name, "_");
5475 strncat(agent_entry_name, lib_name, name_len);
5476 }
5477 } else {
5478 strcpy(agent_entry_name, sym_name);
5479 }
5480 return agent_entry_name;
5481 }
5482
5483 #else
5484 // Kernel32 API
5485 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5486 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5487 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5488 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5489 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5490
5491 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5492 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5493 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5494 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5495 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5496
5497 void os::Kernel32Dll::initialize() {
5498 if (!initialized) {
5499 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5500 assert(handle != NULL, "Just check");
5501
5502 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5503 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5504 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5505 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5506 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5507 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5508 initializeCommon(); // resolve the functions that always need resolving
5509
5510 initialized = TRUE;
5511 }
5512 }
5513
5514 BOOL os::Kernel32Dll::SwitchToThread() {
5515 assert(initialized && _SwitchToThread != NULL,
5516 "SwitchToThreadAvailable() not yet called");
5517 return _SwitchToThread();
5518 }
5519
5520
5521 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5522 if (!initialized) {
5523 initialize();
5524 }
5525 return _SwitchToThread != NULL;
5526 }
5527
5528 // Help tools
5529 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5530 if (!initialized) {
5531 initialize();
5532 }
5533 return _CreateToolhelp32Snapshot != NULL &&
5534 _Module32First != NULL &&
5535 _Module32Next != NULL;
5536 }
5537
5538 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5539 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5540 "HelpToolsAvailable() not yet called");
5541
5542 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5543 }
5544
5545 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5546 assert(initialized && _Module32First != NULL,
5547 "HelpToolsAvailable() not yet called");
5548
5549 return _Module32First(hSnapshot, lpme);
5550 }
5551
5552 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5553 assert(initialized && _Module32Next != NULL,
5554 "HelpToolsAvailable() not yet called");
5555
5556 return _Module32Next(hSnapshot, lpme);
5557 }
5558
5559
5560 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5561 if (!initialized) {
5562 initialize();
5563 }
5564 return _GetNativeSystemInfo != NULL;
5565 }
5566
5567 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5568 assert(initialized && _GetNativeSystemInfo != NULL,
5569 "GetNativeSystemInfoAvailable() not yet called");
5570
5571 _GetNativeSystemInfo(lpSystemInfo);
5572 }
5573
5574 // PSAPI API
5575
5576
5577 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5578 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5579 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5580
5581 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5582 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5583 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5584 BOOL os::PSApiDll::initialized = FALSE;
5585
5586 void os::PSApiDll::initialize() {
5587 if (!initialized) {
5588 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5589 if (handle != NULL) {
5590 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5591 "EnumProcessModules");
5592 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5593 "GetModuleFileNameExA");
5594 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5595 "GetModuleInformation");
5596 }
5597 initialized = TRUE;
5598 }
5599 }
5600
5601
5602
5603 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5604 assert(initialized && _EnumProcessModules != NULL,
5605 "PSApiAvailable() not yet called");
5606 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5607 }
5608
5609 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5610 assert(initialized && _GetModuleFileNameEx != NULL,
5611 "PSApiAvailable() not yet called");
5612 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5613 }
5614
5615 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5616 assert(initialized && _GetModuleInformation != NULL,
5617 "PSApiAvailable() not yet called");
5618 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5619 }
5620
5621 BOOL os::PSApiDll::PSApiAvailable() {
5622 if (!initialized) {
5623 initialize();
5624 }
5625 return _EnumProcessModules != NULL &&
5626 _GetModuleFileNameEx != NULL &&
5627 _GetModuleInformation != NULL;
5628 }
5629
5630
5631 // WinSock2 API
5632 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5633 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5634
5635 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5636 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5637 BOOL os::WinSock2Dll::initialized = FALSE;
5638
5639 void os::WinSock2Dll::initialize() {
5640 if (!initialized) {
5641 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5642 if (handle != NULL) {
5643 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5644 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5645 }
5646 initialized = TRUE;
5647 }
5648 }
5649
5650
5651 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5652 assert(initialized && _WSAStartup != NULL,
5653 "WinSock2Available() not yet called");
5654 return _WSAStartup(wVersionRequested, lpWSAData);
5655 }
5656
5657 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5658 assert(initialized && _gethostbyname != NULL,
5659 "WinSock2Available() not yet called");
5660 return _gethostbyname(name);
5661 }
5662
5663 BOOL os::WinSock2Dll::WinSock2Available() {
5664 if (!initialized) {
5665 initialize();
5666 }
5667 return _WSAStartup != NULL &&
5668 _gethostbyname != NULL;
5669 }
5670
5671 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5672 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5673 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5674
5675 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5676 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5677 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5678 BOOL os::Advapi32Dll::initialized = FALSE;
5679
5680 void os::Advapi32Dll::initialize() {
5681 if (!initialized) {
5682 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5683 if (handle != NULL) {
5684 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5685 "AdjustTokenPrivileges");
5686 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5687 "OpenProcessToken");
5688 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5689 "LookupPrivilegeValueA");
5690 }
5691 initialized = TRUE;
5692 }
5693 }
5694
5695 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5696 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5697 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5698 assert(initialized && _AdjustTokenPrivileges != NULL,
5699 "AdvapiAvailable() not yet called");
5700 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5701 BufferLength, PreviousState, ReturnLength);
5702 }
5703
5704 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5705 PHANDLE TokenHandle) {
5706 assert(initialized && _OpenProcessToken != NULL,
5707 "AdvapiAvailable() not yet called");
5708 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5709 }
5710
5711 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5712 assert(initialized && _LookupPrivilegeValue != NULL,
5713 "AdvapiAvailable() not yet called");
5714 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5715 }
5716
5717 BOOL os::Advapi32Dll::AdvapiAvailable() {
5718 if (!initialized) {
5719 initialize();
5720 }
5721 return _AdjustTokenPrivileges != NULL &&
5722 _OpenProcessToken != NULL &&
5723 _LookupPrivilegeValue != NULL;
5724 }
5725
5726 #endif
5727
5728 #ifndef PRODUCT
5729
5730 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5731 // contiguous memory block at a particular address.
5732 // The test first tries to find a good approximate address to allocate at by using the same
5733 // method to allocate some memory at any address. The test then tries to allocate memory in
5734 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5735 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5736 // the previously allocated memory is available for allocation. The only actual failure
5737 // that is reported is when the test tries to allocate at a particular location but gets a
5738 // different valid one. A NULL return value at this point is not considered an error but may
5739 // be legitimate.
5740 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5741 void TestReserveMemorySpecial_test() {
5742 if (!UseLargePages) {
5743 if (VerboseInternalVMTests) {
5744 gclog_or_tty->print("Skipping test because large pages are disabled");
5745 }
5746 return;
5747 }
5748 // save current value of globals
5749 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5750 bool old_use_numa_interleaving = UseNUMAInterleaving;
5751
5752 // set globals to make sure we hit the correct code path
5753 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5754
5755 // do an allocation at an address selected by the OS to get a good one.
5756 const size_t large_allocation_size = os::large_page_size() * 4;
5757 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5758 if (result == NULL) {
5759 if (VerboseInternalVMTests) {
5760 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5761 large_allocation_size);
5762 }
5763 } else {
5764 os::release_memory_special(result, large_allocation_size);
5765
5766 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5767 // we managed to get it once.
5768 const size_t expected_allocation_size = os::large_page_size();
5769 char* expected_location = result + os::large_page_size();
5770 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5771 if (actual_location == NULL) {
5772 if (VerboseInternalVMTests) {
5773 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5774 expected_location, large_allocation_size);
5775 }
5776 } else {
5777 // release memory
5778 os::release_memory_special(actual_location, expected_allocation_size);
5779 // only now check, after releasing any memory to avoid any leaks.
5780 assert(actual_location == expected_location,
5781 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5782 expected_location, expected_allocation_size, actual_location));
5783 }
5784 }
5785
5786 // restore globals
5787 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5788 UseNUMAInterleaving = old_use_numa_interleaving;
5789 }
5790 #endif // PRODUCT
5791