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