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 ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2429 VM_Version::is_cpuinfo_segv_addr(pc)) {
2430 // Verify that OS save/restore AVX registers.
2431 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2432 }
2433
2434 if (t != NULL && t->is_Java_thread()) {
2435 JavaThread* thread = (JavaThread*) t;
2436 bool in_java = thread->thread_state() == _thread_in_Java;
2437
2438 // Handle potential stack overflows up front.
2439 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2440 if (os::uses_stack_guard_pages()) {
2441 #ifdef _M_IA64
2442 // Use guard page for register stack.
2443 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2444 address addr = (address) exceptionRecord->ExceptionInformation[1];
2445 // Check for a register stack overflow on Itanium
2446 if (thread->addr_inside_register_stack_red_zone(addr)) {
2447 // Fatal red zone violation happens if the Java program
2448 // catches a StackOverflow error and does so much processing
2449 // that it runs beyond the unprotected yellow guard zone. As
2450 // a result, we are out of here.
2451 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2452 } else if(thread->addr_inside_register_stack(addr)) {
2453 // Disable the yellow zone which sets the state that
2454 // we've got a stack overflow problem.
2455 if (thread->stack_yellow_zone_enabled()) {
2456 thread->disable_stack_yellow_zone();
2457 }
2458 // Give us some room to process the exception.
2459 thread->disable_register_stack_guard();
2460 // Tracing with +Verbose.
2461 if (Verbose) {
2462 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2463 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2464 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2465 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2466 thread->register_stack_base(),
2467 thread->register_stack_base() + thread->stack_size());
2468 }
2469
2470 // Reguard the permanent register stack red zone just to be sure.
2471 // We saw Windows silently disabling this without telling us.
2472 thread->enable_register_stack_red_zone();
2473
2474 return Handle_Exception(exceptionInfo,
2475 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2476 }
2477 #endif
2478 if (thread->stack_yellow_zone_enabled()) {
2479 // Yellow zone violation. The o/s has unprotected the first yellow
2480 // zone page for us. Note: must call disable_stack_yellow_zone to
2481 // update the enabled status, even if the zone contains only one page.
2482 thread->disable_stack_yellow_zone();
2483 // If not in java code, return and hope for the best.
2484 return in_java ? Handle_Exception(exceptionInfo,
2485 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2486 : EXCEPTION_CONTINUE_EXECUTION;
2487 } else {
2488 // Fatal red zone violation.
2489 thread->disable_stack_red_zone();
2490 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2491 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2492 exceptionInfo->ContextRecord);
2493 return EXCEPTION_CONTINUE_SEARCH;
2494 }
2495 } else if (in_java) {
2496 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2497 // a one-time-only guard page, which it has released to us. The next
2498 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2499 return Handle_Exception(exceptionInfo,
2500 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2501 } else {
2502 // Can only return and hope for the best. Further stack growth will
2503 // result in an ACCESS_VIOLATION.
2504 return EXCEPTION_CONTINUE_EXECUTION;
2505 }
2506 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2507 // Either stack overflow or null pointer exception.
2508 if (in_java) {
2509 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2510 address addr = (address) exceptionRecord->ExceptionInformation[1];
2511 address stack_end = thread->stack_base() - thread->stack_size();
2512 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2513 // Stack overflow.
2514 assert(!os::uses_stack_guard_pages(),
2515 "should be caught by red zone code above.");
2516 return Handle_Exception(exceptionInfo,
2517 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2518 }
2519 //
2520 // Check for safepoint polling and implicit null
2521 // We only expect null pointers in the stubs (vtable)
2522 // the rest are checked explicitly now.
2523 //
2524 CodeBlob* cb = CodeCache::find_blob(pc);
2525 if (cb != NULL) {
2526 if (os::is_poll_address(addr)) {
2527 address stub = SharedRuntime::get_poll_stub(pc);
2528 return Handle_Exception(exceptionInfo, stub);
2529 }
2530 }
2531 {
2532 #ifdef _WIN64
2533 //
2534 // If it's a legal stack address map the entire region in
2535 //
2536 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2537 address addr = (address) exceptionRecord->ExceptionInformation[1];
2538 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2539 addr = (address)((uintptr_t)addr &
2540 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2541 os::commit_memory((char *)addr, thread->stack_base() - addr,
2542 !ExecMem);
2543 return EXCEPTION_CONTINUE_EXECUTION;
2544 }
2545 else
2546 #endif
2547 {
2548 // Null pointer exception.
2549 #ifdef _M_IA64
2550 // Process implicit null checks in compiled code. Note: Implicit null checks
2551 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2552 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2553 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2554 // Handle implicit null check in UEP method entry
2555 if (cb && (cb->is_frame_complete_at(pc) ||
2556 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2557 if (Verbose) {
2558 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2559 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2560 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2561 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2562 *(bundle_start + 1), *bundle_start);
2563 }
2564 return Handle_Exception(exceptionInfo,
2565 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2566 }
2567 }
2568
2569 // Implicit null checks were processed above. Hence, we should not reach
2570 // here in the usual case => die!
2571 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2572 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2573 exceptionInfo->ContextRecord);
2574 return EXCEPTION_CONTINUE_SEARCH;
2575
2576 #else // !IA64
2577
2578 // Windows 98 reports faulting addresses incorrectly
2579 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2580 !os::win32::is_nt()) {
2581 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2582 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2583 }
2584 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 return EXCEPTION_CONTINUE_SEARCH;
2587 #endif
2588 }
2589 }
2590 }
2591
2592 #ifdef _WIN64
2593 // Special care for fast JNI field accessors.
2594 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2595 // in and the heap gets shrunk before the field access.
2596 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2597 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2598 if (addr != (address)-1) {
2599 return Handle_Exception(exceptionInfo, addr);
2600 }
2601 }
2602 #endif
2603
2604 // Stack overflow or null pointer exception in native code.
2605 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2606 exceptionInfo->ContextRecord);
2607 return EXCEPTION_CONTINUE_SEARCH;
2608 } // /EXCEPTION_ACCESS_VIOLATION
2609 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2610 #if defined _M_IA64
2611 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2612 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2613 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2614
2615 // Compiled method patched to be non entrant? Following conditions must apply:
2616 // 1. must be first instruction in bundle
2617 // 2. must be a break instruction with appropriate code
2618 if((((uint64_t) pc & 0x0F) == 0) &&
2619 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2620 return Handle_Exception(exceptionInfo,
2621 (address)SharedRuntime::get_handle_wrong_method_stub());
2622 }
2623 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2624 #endif
2625
2626
2627 if (in_java) {
2628 switch (exception_code) {
2629 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2630 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2631
2632 case EXCEPTION_INT_OVERFLOW:
2633 return Handle_IDiv_Exception(exceptionInfo);
2634
2635 } // switch
2636 }
2637 if (((thread->thread_state() == _thread_in_Java) ||
2638 (thread->thread_state() == _thread_in_native)) &&
2639 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2640 {
2641 LONG result=Handle_FLT_Exception(exceptionInfo);
2642 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2643 }
2644 }
2645
2646 if (exception_code != EXCEPTION_BREAKPOINT) {
2647 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2648 exceptionInfo->ContextRecord);
2649 }
2650 return EXCEPTION_CONTINUE_SEARCH;
2651 }
2652
2653 #ifndef _WIN64
2654 // Special care for fast JNI accessors.
2655 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2656 // the heap gets shrunk before the field access.
2657 // Need to install our own structured exception handler since native code may
2658 // install its own.
2659 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2660 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2661 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2662 address pc = (address) exceptionInfo->ContextRecord->Eip;
2663 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2664 if (addr != (address)-1) {
2665 return Handle_Exception(exceptionInfo, addr);
2666 }
2667 }
2668 return EXCEPTION_CONTINUE_SEARCH;
2669 }
2670
2671 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2672 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2673 __try { \
2674 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2675 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2676 } \
2677 return 0; \
2678 }
2679
2680 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2681 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2682 DEFINE_FAST_GETFIELD(jchar, char, Char)
2683 DEFINE_FAST_GETFIELD(jshort, short, Short)
2684 DEFINE_FAST_GETFIELD(jint, int, Int)
2685 DEFINE_FAST_GETFIELD(jlong, long, Long)
2686 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2687 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2688
2689 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2690 switch (type) {
2691 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2692 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2693 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2694 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2695 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2696 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2697 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2698 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2699 default: ShouldNotReachHere();
2700 }
2701 return (address)-1;
2702 }
2703 #endif
2704
2705 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2706 // Install a win32 structured exception handler around the test
2707 // function call so the VM can generate an error dump if needed.
2708 __try {
2709 (*funcPtr)();
2710 } __except(topLevelExceptionFilter(
2711 (_EXCEPTION_POINTERS*)_exception_info())) {
2712 // Nothing to do.
2713 }
2714 }
2715
2716 // Virtual Memory
2717
2718 int os::vm_page_size() { return os::win32::vm_page_size(); }
2719 int os::vm_allocation_granularity() {
2720 return os::win32::vm_allocation_granularity();
2721 }
2722
2723 // Windows large page support is available on Windows 2003. In order to use
2724 // large page memory, the administrator must first assign additional privilege
2725 // to the user:
2726 // + select Control Panel -> Administrative Tools -> Local Security Policy
2727 // + select Local Policies -> User Rights Assignment
2728 // + double click "Lock pages in memory", add users and/or groups
2729 // + reboot
2730 // Note the above steps are needed for administrator as well, as administrators
2731 // by default do not have the privilege to lock pages in memory.
2732 //
2733 // Note about Windows 2003: although the API supports committing large page
2734 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2735 // scenario, I found through experiment it only uses large page if the entire
2736 // memory region is reserved and committed in a single VirtualAlloc() call.
2737 // This makes Windows large page support more or less like Solaris ISM, in
2738 // that the entire heap must be committed upfront. This probably will change
2739 // in the future, if so the code below needs to be revisited.
2740
2741 #ifndef MEM_LARGE_PAGES
2742 #define MEM_LARGE_PAGES 0x20000000
2743 #endif
2744
2745 static HANDLE _hProcess;
2746 static HANDLE _hToken;
2747
2748 // Container for NUMA node list info
2749 class NUMANodeListHolder {
2750 private:
2751 int *_numa_used_node_list; // allocated below
2752 int _numa_used_node_count;
2753
2754 void free_node_list() {
2755 if (_numa_used_node_list != NULL) {
2756 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2757 }
2758 }
2759
2760 public:
2761 NUMANodeListHolder() {
2762 _numa_used_node_count = 0;
2763 _numa_used_node_list = NULL;
2764 // do rest of initialization in build routine (after function pointers are set up)
2765 }
2766
2767 ~NUMANodeListHolder() {
2768 free_node_list();
2769 }
2770
2771 bool build() {
2772 DWORD_PTR proc_aff_mask;
2773 DWORD_PTR sys_aff_mask;
2774 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2775 ULONG highest_node_number;
2776 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2777 free_node_list();
2778 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2779 for (unsigned int i = 0; i <= highest_node_number; i++) {
2780 ULONGLONG proc_mask_numa_node;
2781 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2782 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2783 _numa_used_node_list[_numa_used_node_count++] = i;
2784 }
2785 }
2786 return (_numa_used_node_count > 1);
2787 }
2788
2789 int get_count() {return _numa_used_node_count;}
2790 int get_node_list_entry(int n) {
2791 // for indexes out of range, returns -1
2792 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2793 }
2794
2795 } numa_node_list_holder;
2796
2797
2798
2799 static size_t _large_page_size = 0;
2800
2801 static bool resolve_functions_for_large_page_init() {
2802 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2803 os::Advapi32Dll::AdvapiAvailable();
2804 }
2805
2806 static bool request_lock_memory_privilege() {
2807 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2808 os::current_process_id());
2809
2810 LUID luid;
2811 if (_hProcess != NULL &&
2812 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2813 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2814
2815 TOKEN_PRIVILEGES tp;
2816 tp.PrivilegeCount = 1;
2817 tp.Privileges[0].Luid = luid;
2818 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2819
2820 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2821 // privilege. Check GetLastError() too. See MSDN document.
2822 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2823 (GetLastError() == ERROR_SUCCESS)) {
2824 return true;
2825 }
2826 }
2827
2828 return false;
2829 }
2830
2831 static void cleanup_after_large_page_init() {
2832 if (_hProcess) CloseHandle(_hProcess);
2833 _hProcess = NULL;
2834 if (_hToken) CloseHandle(_hToken);
2835 _hToken = NULL;
2836 }
2837
2838 static bool numa_interleaving_init() {
2839 bool success = false;
2840 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2841
2842 // print a warning if UseNUMAInterleaving flag is specified on command line
2843 bool warn_on_failure = use_numa_interleaving_specified;
2844 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2845
2846 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2847 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2848 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2849
2850 if (os::Kernel32Dll::NumaCallsAvailable()) {
2851 if (numa_node_list_holder.build()) {
2852 if (PrintMiscellaneous && Verbose) {
2853 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2854 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2855 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2856 }
2857 tty->print("\n");
2858 }
2859 success = true;
2860 } else {
2861 WARN("Process does not cover multiple NUMA nodes.");
2862 }
2863 } else {
2864 WARN("NUMA Interleaving is not supported by the operating system.");
2865 }
2866 if (!success) {
2867 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2868 }
2869 return success;
2870 #undef WARN
2871 }
2872
2873 // this routine is used whenever we need to reserve a contiguous VA range
2874 // but we need to make separate VirtualAlloc calls for each piece of the range
2875 // Reasons for doing this:
2876 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2877 // * UseNUMAInterleaving requires a separate node for each piece
2878 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2879 bool should_inject_error=false) {
2880 char * p_buf;
2881 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2882 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2883 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2884
2885 // first reserve enough address space in advance since we want to be
2886 // able to break a single contiguous virtual address range into multiple
2887 // large page commits but WS2003 does not allow reserving large page space
2888 // so we just use 4K pages for reserve, this gives us a legal contiguous
2889 // address space. then we will deallocate that reservation, and re alloc
2890 // using large pages
2891 const size_t size_of_reserve = bytes + chunk_size;
2892 if (bytes > size_of_reserve) {
2893 // Overflowed.
2894 return NULL;
2895 }
2896 p_buf = (char *) VirtualAlloc(addr,
2897 size_of_reserve, // size of Reserve
2898 MEM_RESERVE,
2899 PAGE_READWRITE);
2900 // If reservation failed, return NULL
2901 if (p_buf == NULL) return NULL;
2902 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
2903 os::release_memory(p_buf, bytes + chunk_size);
2904
2905 // we still need to round up to a page boundary (in case we are using large pages)
2906 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2907 // instead we handle this in the bytes_to_rq computation below
2908 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2909
2910 // now go through and allocate one chunk at a time until all bytes are
2911 // allocated
2912 size_t bytes_remaining = bytes;
2913 // An overflow of align_size_up() would have been caught above
2914 // in the calculation of size_of_reserve.
2915 char * next_alloc_addr = p_buf;
2916 HANDLE hProc = GetCurrentProcess();
2917
2918 #ifdef ASSERT
2919 // Variable for the failure injection
2920 long ran_num = os::random();
2921 size_t fail_after = ran_num % bytes;
2922 #endif
2923
2924 int count=0;
2925 while (bytes_remaining) {
2926 // select bytes_to_rq to get to the next chunk_size boundary
2927
2928 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2929 // Note allocate and commit
2930 char * p_new;
2931
2932 #ifdef ASSERT
2933 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2934 #else
2935 const bool inject_error_now = false;
2936 #endif
2937
2938 if (inject_error_now) {
2939 p_new = NULL;
2940 } else {
2941 if (!UseNUMAInterleaving) {
2942 p_new = (char *) VirtualAlloc(next_alloc_addr,
2943 bytes_to_rq,
2944 flags,
2945 prot);
2946 } else {
2947 // get the next node to use from the used_node_list
2948 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2949 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2950 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2951 next_alloc_addr,
2952 bytes_to_rq,
2953 flags,
2954 prot,
2955 node);
2956 }
2957 }
2958
2959 if (p_new == NULL) {
2960 // Free any allocated pages
2961 if (next_alloc_addr > p_buf) {
2962 // Some memory was committed so release it.
2963 size_t bytes_to_release = bytes - bytes_remaining;
2964 // NMT has yet to record any individual blocks, so it
2965 // need to create a dummy 'reserve' record to match
2966 // the release.
2967 MemTracker::record_virtual_memory_reserve((address)p_buf,
2968 bytes_to_release, mtNone, CALLER_PC);
2969 os::release_memory(p_buf, bytes_to_release);
2970 }
2971 #ifdef ASSERT
2972 if (should_inject_error) {
2973 if (TracePageSizes && Verbose) {
2974 tty->print_cr("Reserving pages individually failed.");
2975 }
2976 }
2977 #endif
2978 return NULL;
2979 }
2980
2981 bytes_remaining -= bytes_to_rq;
2982 next_alloc_addr += bytes_to_rq;
2983 count++;
2984 }
2985 // Although the memory is allocated individually, it is returned as one.
2986 // NMT records it as one block.
2987 address pc = CALLER_PC;
2988 if ((flags & MEM_COMMIT) != 0) {
2989 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
2990 } else {
2991 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
2992 }
2993
2994 // made it this far, success
2995 return p_buf;
2996 }
2997
2998
2999
3000 void os::large_page_init() {
3001 if (!UseLargePages) return;
3002
3003 // print a warning if any large page related flag is specified on command line
3004 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3005 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3006 bool success = false;
3007
3008 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3009 if (resolve_functions_for_large_page_init()) {
3010 if (request_lock_memory_privilege()) {
3011 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3012 if (s) {
3013 #if defined(IA32) || defined(AMD64)
3014 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3015 WARN("JVM cannot use large pages bigger than 4mb.");
3016 } else {
3017 #endif
3018 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3019 _large_page_size = LargePageSizeInBytes;
3020 } else {
3021 _large_page_size = s;
3022 }
3023 success = true;
3024 #if defined(IA32) || defined(AMD64)
3025 }
3026 #endif
3027 } else {
3028 WARN("Large page is not supported by the processor.");
3029 }
3030 } else {
3031 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3032 }
3033 } else {
3034 WARN("Large page is not supported by the operating system.");
3035 }
3036 #undef WARN
3037
3038 const size_t default_page_size = (size_t) vm_page_size();
3039 if (success && _large_page_size > default_page_size) {
3040 _page_sizes[0] = _large_page_size;
3041 _page_sizes[1] = default_page_size;
3042 _page_sizes[2] = 0;
3043 }
3044
3045 cleanup_after_large_page_init();
3046 UseLargePages = success;
3047 }
3048
3049 // On win32, one cannot release just a part of reserved memory, it's an
3050 // all or nothing deal. When we split a reservation, we must break the
3051 // reservation into two reservations.
3052 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3053 bool realloc) {
3054 if (size > 0) {
3055 release_memory(base, size);
3056 if (realloc) {
3057 reserve_memory(split, base);
3058 }
3059 if (size != split) {
3060 reserve_memory(size - split, base + split);
3061 }
3062 }
3063 }
3064
3065 // Multiple threads can race in this code but it's not possible to unmap small sections of
3066 // virtual space to get requested alignment, like posix-like os's.
3067 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3068 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3069 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3070 "Alignment must be a multiple of allocation granularity (page size)");
3071 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3072
3073 size_t extra_size = size + alignment;
3074 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3075
3076 char* aligned_base = NULL;
3077
3078 do {
3079 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3080 if (extra_base == NULL) {
3081 return NULL;
3082 }
3083 // Do manual alignment
3084 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3085
3086 os::release_memory(extra_base, extra_size);
3087
3088 aligned_base = os::reserve_memory(size, aligned_base);
3089
3090 } while (aligned_base == NULL);
3091
3092 return aligned_base;
3093 }
3094
3095 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3096 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3097 "reserve alignment");
3098 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3099 char* res;
3100 // note that if UseLargePages is on, all the areas that require interleaving
3101 // will go thru reserve_memory_special rather than thru here.
3102 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3103 if (!use_individual) {
3104 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3105 } else {
3106 elapsedTimer reserveTimer;
3107 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3108 // in numa interleaving, we have to allocate pages individually
3109 // (well really chunks of NUMAInterleaveGranularity size)
3110 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3111 if (res == NULL) {
3112 warning("NUMA page allocation failed");
3113 }
3114 if( Verbose && PrintMiscellaneous ) {
3115 reserveTimer.stop();
3116 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3117 reserveTimer.milliseconds(), reserveTimer.ticks());
3118 }
3119 }
3120 assert(res == NULL || addr == NULL || addr == res,
3121 "Unexpected address from reserve.");
3122
3123 return res;
3124 }
3125
3126 // Reserve memory at an arbitrary address, only if that area is
3127 // available (and not reserved for something else).
3128 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3129 // Windows os::reserve_memory() fails of the requested address range is
3130 // not avilable.
3131 return reserve_memory(bytes, requested_addr);
3132 }
3133
3134 size_t os::large_page_size() {
3135 return _large_page_size;
3136 }
3137
3138 bool os::can_commit_large_page_memory() {
3139 // Windows only uses large page memory when the entire region is reserved
3140 // and committed in a single VirtualAlloc() call. This may change in the
3141 // future, but with Windows 2003 it's not possible to commit on demand.
3142 return false;
3143 }
3144
3145 bool os::can_execute_large_page_memory() {
3146 return true;
3147 }
3148
3149 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3150 assert(UseLargePages, "only for large pages");
3151
3152 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3153 return NULL; // Fallback to small pages.
3154 }
3155
3156 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3157 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3158
3159 // with large pages, there are two cases where we need to use Individual Allocation
3160 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3161 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3162 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3163 if (TracePageSizes && Verbose) {
3164 tty->print_cr("Reserving large pages individually.");
3165 }
3166 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3167 if (p_buf == NULL) {
3168 // give an appropriate warning message
3169 if (UseNUMAInterleaving) {
3170 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3171 }
3172 if (UseLargePagesIndividualAllocation) {
3173 warning("Individually allocated large pages failed, "
3174 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3175 }
3176 return NULL;
3177 }
3178
3179 return p_buf;
3180
3181 } else {
3182 if (TracePageSizes && Verbose) {
3183 tty->print_cr("Reserving large pages in a single large chunk.");
3184 }
3185 // normal policy just allocate it all at once
3186 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3187 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3188 if (res != NULL) {
3189 address pc = CALLER_PC;
3190 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
3191 }
3192
3193 return res;
3194 }
3195 }
3196
3197 bool os::release_memory_special(char* base, size_t bytes) {
3198 assert(base != NULL, "Sanity check");
3199 return release_memory(base, bytes);
3200 }
3201
3202 void os::print_statistics() {
3203 }
3204
3205 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3206 int err = os::get_last_error();
3207 char buf[256];
3208 size_t buf_len = os::lasterror(buf, sizeof(buf));
3209 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3210 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3211 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3212 }
3213
3214 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3215 if (bytes == 0) {
3216 // Don't bother the OS with noops.
3217 return true;
3218 }
3219 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3220 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3221 // Don't attempt to print anything if the OS call fails. We're
3222 // probably low on resources, so the print itself may cause crashes.
3223
3224 // unless we have NUMAInterleaving enabled, the range of a commit
3225 // is always within a reserve covered by a single VirtualAlloc
3226 // in that case we can just do a single commit for the requested size
3227 if (!UseNUMAInterleaving) {
3228 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3229 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3230 return false;
3231 }
3232 if (exec) {
3233 DWORD oldprot;
3234 // Windows doc says to use VirtualProtect to get execute permissions
3235 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3236 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3237 return false;
3238 }
3239 }
3240 return true;
3241 } else {
3242
3243 // when NUMAInterleaving is enabled, the commit might cover a range that
3244 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3245 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3246 // returns represents the number of bytes that can be committed in one step.
3247 size_t bytes_remaining = bytes;
3248 char * next_alloc_addr = addr;
3249 while (bytes_remaining > 0) {
3250 MEMORY_BASIC_INFORMATION alloc_info;
3251 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3252 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3253 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3254 PAGE_READWRITE) == NULL) {
3255 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3256 exec);)
3257 return false;
3258 }
3259 if (exec) {
3260 DWORD oldprot;
3261 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3262 PAGE_EXECUTE_READWRITE, &oldprot)) {
3263 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3264 exec);)
3265 return false;
3266 }
3267 }
3268 bytes_remaining -= bytes_to_rq;
3269 next_alloc_addr += bytes_to_rq;
3270 }
3271 }
3272 // if we made it this far, return true
3273 return true;
3274 }
3275
3276 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3277 bool exec) {
3278 // alignment_hint is ignored on this OS
3279 return pd_commit_memory(addr, size, exec);
3280 }
3281
3282 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3283 const char* mesg) {
3284 assert(mesg != NULL, "mesg must be specified");
3285 if (!pd_commit_memory(addr, size, exec)) {
3286 warn_fail_commit_memory(addr, size, exec);
3287 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3288 }
3289 }
3290
3291 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3292 size_t alignment_hint, bool exec,
3293 const char* mesg) {
3294 // alignment_hint is ignored on this OS
3295 pd_commit_memory_or_exit(addr, size, exec, mesg);
3296 }
3297
3298 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3299 if (bytes == 0) {
3300 // Don't bother the OS with noops.
3301 return true;
3302 }
3303 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3304 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3305 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3306 }
3307
3308 bool os::pd_release_memory(char* addr, size_t bytes) {
3309 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3310 }
3311
3312 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3313 return os::commit_memory(addr, size, !ExecMem);
3314 }
3315
3316 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3317 return os::uncommit_memory(addr, size);
3318 }
3319
3320 // Set protections specified
3321 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3322 bool is_committed) {
3323 unsigned int p = 0;
3324 switch (prot) {
3325 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3326 case MEM_PROT_READ: p = PAGE_READONLY; break;
3327 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3328 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3329 default:
3330 ShouldNotReachHere();
3331 }
3332
3333 DWORD old_status;
3334
3335 // Strange enough, but on Win32 one can change protection only for committed
3336 // memory, not a big deal anyway, as bytes less or equal than 64K
3337 if (!is_committed) {
3338 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3339 "cannot commit protection page");
3340 }
3341 // One cannot use os::guard_memory() here, as on Win32 guard page
3342 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3343 //
3344 // Pages in the region become guard pages. Any attempt to access a guard page
3345 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3346 // the guard page status. Guard pages thus act as a one-time access alarm.
3347 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3348 }
3349
3350 bool os::guard_memory(char* addr, size_t bytes) {
3351 DWORD old_status;
3352 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3353 }
3354
3355 bool os::unguard_memory(char* addr, size_t bytes) {
3356 DWORD old_status;
3357 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3358 }
3359
3360 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3361 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3362 void os::numa_make_global(char *addr, size_t bytes) { }
3363 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3364 bool os::numa_topology_changed() { return false; }
3365 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3366 int os::numa_get_group_id() { return 0; }
3367 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3368 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3369 // Provide an answer for UMA systems
3370 ids[0] = 0;
3371 return 1;
3372 } else {
3373 // check for size bigger than actual groups_num
3374 size = MIN2(size, numa_get_groups_num());
3375 for (int i = 0; i < (int)size; i++) {
3376 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3377 }
3378 return size;
3379 }
3380 }
3381
3382 bool os::get_page_info(char *start, page_info* info) {
3383 return false;
3384 }
3385
3386 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3387 return end;
3388 }
3389
3390 char* os::non_memory_address_word() {
3391 // Must never look like an address returned by reserve_memory,
3392 // even in its subfields (as defined by the CPU immediate fields,
3393 // if the CPU splits constants across multiple instructions).
3394 return (char*)-1;
3395 }
3396
3397 #define MAX_ERROR_COUNT 100
3398 #define SYS_THREAD_ERROR 0xffffffffUL
3399
3400 void os::pd_start_thread(Thread* thread) {
3401 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3402 // Returns previous suspend state:
3403 // 0: Thread was not suspended
3404 // 1: Thread is running now
3405 // >1: Thread is still suspended.
3406 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3407 }
3408
3409 class HighResolutionInterval : public CHeapObj<mtThread> {
3410 // The default timer resolution seems to be 10 milliseconds.
3411 // (Where is this written down?)
3412 // If someone wants to sleep for only a fraction of the default,
3413 // then we set the timer resolution down to 1 millisecond for
3414 // the duration of their interval.
3415 // We carefully set the resolution back, since otherwise we
3416 // seem to incur an overhead (3%?) that we don't need.
3417 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3418 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3419 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3420 // timeBeginPeriod() if the relative error exceeded some threshold.
3421 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3422 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3423 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3424 // resolution timers running.
3425 private:
3426 jlong resolution;
3427 public:
3428 HighResolutionInterval(jlong ms) {
3429 resolution = ms % 10L;
3430 if (resolution != 0) {
3431 MMRESULT result = timeBeginPeriod(1L);
3432 }
3433 }
3434 ~HighResolutionInterval() {
3435 if (resolution != 0) {
3436 MMRESULT result = timeEndPeriod(1L);
3437 }
3438 resolution = 0L;
3439 }
3440 };
3441
3442 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3443 jlong limit = (jlong) MAXDWORD;
3444
3445 while(ms > limit) {
3446 int res;
3447 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3448 return res;
3449 ms -= limit;
3450 }
3451
3452 assert(thread == Thread::current(), "thread consistency check");
3453 OSThread* osthread = thread->osthread();
3454 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3455 int result;
3456 if (interruptable) {
3457 assert(thread->is_Java_thread(), "must be java thread");
3458 JavaThread *jt = (JavaThread *) thread;
3459 ThreadBlockInVM tbivm(jt);
3460
3461 jt->set_suspend_equivalent();
3462 // cleared by handle_special_suspend_equivalent_condition() or
3463 // java_suspend_self() via check_and_wait_while_suspended()
3464
3465 HANDLE events[1];
3466 events[0] = osthread->interrupt_event();
3467 HighResolutionInterval *phri=NULL;
3468 if(!ForceTimeHighResolution)
3469 phri = new HighResolutionInterval( ms );
3470 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3471 result = OS_TIMEOUT;
3472 } else {
3473 ResetEvent(osthread->interrupt_event());
3474 osthread->set_interrupted(false);
3475 result = OS_INTRPT;
3476 }
3477 delete phri; //if it is NULL, harmless
3478
3479 // were we externally suspended while we were waiting?
3480 jt->check_and_wait_while_suspended();
3481 } else {
3482 assert(!thread->is_Java_thread(), "must not be java thread");
3483 Sleep((long) ms);
3484 result = OS_TIMEOUT;
3485 }
3486 return result;
3487 }
3488
3489 //
3490 // Short sleep, direct OS call.
3491 //
3492 // ms = 0, means allow others (if any) to run.
3493 //
3494 void os::naked_short_sleep(jlong ms) {
3495 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3496 Sleep(ms);
3497 }
3498
3499 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3500 void os::infinite_sleep() {
3501 while (true) { // sleep forever ...
3502 Sleep(100000); // ... 100 seconds at a time
3503 }
3504 }
3505
3506 typedef BOOL (WINAPI * STTSignature)(void) ;
3507
3508 os::YieldResult os::NakedYield() {
3509 // Use either SwitchToThread() or Sleep(0)
3510 // Consider passing back the return value from SwitchToThread().
3511 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3512 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3513 } else {
3514 Sleep(0);
3515 }
3516 return os::YIELD_UNKNOWN ;
3517 }
3518
3519 void os::yield() { os::NakedYield(); }
3520
3521 void os::yield_all() {
3522 // Yields to all threads, including threads with lower priorities
3523 Sleep(1);
3524 }
3525
3526 // Win32 only gives you access to seven real priorities at a time,
3527 // so we compress Java's ten down to seven. It would be better
3528 // if we dynamically adjusted relative priorities.
3529
3530 int os::java_to_os_priority[CriticalPriority + 1] = {
3531 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3532 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3533 THREAD_PRIORITY_LOWEST, // 2
3534 THREAD_PRIORITY_BELOW_NORMAL, // 3
3535 THREAD_PRIORITY_BELOW_NORMAL, // 4
3536 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3537 THREAD_PRIORITY_NORMAL, // 6
3538 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3540 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3541 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3542 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3543 };
3544
3545 int prio_policy1[CriticalPriority + 1] = {
3546 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3547 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3548 THREAD_PRIORITY_LOWEST, // 2
3549 THREAD_PRIORITY_BELOW_NORMAL, // 3
3550 THREAD_PRIORITY_BELOW_NORMAL, // 4
3551 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3552 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3553 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3554 THREAD_PRIORITY_HIGHEST, // 8
3555 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3556 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3557 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3558 };
3559
3560 static int prio_init() {
3561 // If ThreadPriorityPolicy is 1, switch tables
3562 if (ThreadPriorityPolicy == 1) {
3563 int i;
3564 for (i = 0; i < CriticalPriority + 1; i++) {
3565 os::java_to_os_priority[i] = prio_policy1[i];
3566 }
3567 }
3568 if (UseCriticalJavaThreadPriority) {
3569 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3570 }
3571 return 0;
3572 }
3573
3574 OSReturn os::set_native_priority(Thread* thread, int priority) {
3575 if (!UseThreadPriorities) return OS_OK;
3576 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3577 return ret ? OS_OK : OS_ERR;
3578 }
3579
3580 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3581 if ( !UseThreadPriorities ) {
3582 *priority_ptr = java_to_os_priority[NormPriority];
3583 return OS_OK;
3584 }
3585 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3586 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3587 assert(false, "GetThreadPriority failed");
3588 return OS_ERR;
3589 }
3590 *priority_ptr = os_prio;
3591 return OS_OK;
3592 }
3593
3594
3595 // Hint to the underlying OS that a task switch would not be good.
3596 // Void return because it's a hint and can fail.
3597 void os::hint_no_preempt() {}
3598
3599 void os::interrupt(Thread* thread) {
3600 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3601 "possibility of dangling Thread pointer");
3602
3603 OSThread* osthread = thread->osthread();
3604 osthread->set_interrupted(true);
3605 // More than one thread can get here with the same value of osthread,
3606 // resulting in multiple notifications. We do, however, want the store
3607 // to interrupted() to be visible to other threads before we post
3608 // the interrupt event.
3609 OrderAccess::release();
3610 SetEvent(osthread->interrupt_event());
3611 // For JSR166: unpark after setting status
3612 if (thread->is_Java_thread())
3613 ((JavaThread*)thread)->parker()->unpark();
3614
3615 ParkEvent * ev = thread->_ParkEvent ;
3616 if (ev != NULL) ev->unpark() ;
3617
3618 }
3619
3620
3621 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3622 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3623 "possibility of dangling Thread pointer");
3624
3625 OSThread* osthread = thread->osthread();
3626 // There is no synchronization between the setting of the interrupt
3627 // and it being cleared here. It is critical - see 6535709 - that
3628 // we only clear the interrupt state, and reset the interrupt event,
3629 // if we are going to report that we were indeed interrupted - else
3630 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3631 // depending on the timing. By checking thread interrupt event to see
3632 // if the thread gets real interrupt thus prevent spurious wakeup.
3633 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3634 if (interrupted && clear_interrupted) {
3635 osthread->set_interrupted(false);
3636 ResetEvent(osthread->interrupt_event());
3637 } // Otherwise leave the interrupted state alone
3638
3639 return interrupted;
3640 }
3641
3642 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3643 ExtendedPC os::get_thread_pc(Thread* thread) {
3644 CONTEXT context;
3645 context.ContextFlags = CONTEXT_CONTROL;
3646 HANDLE handle = thread->osthread()->thread_handle();
3647 #ifdef _M_IA64
3648 assert(0, "Fix get_thread_pc");
3649 return ExtendedPC(NULL);
3650 #else
3651 if (GetThreadContext(handle, &context)) {
3652 #ifdef _M_AMD64
3653 return ExtendedPC((address) context.Rip);
3654 #else
3655 return ExtendedPC((address) context.Eip);
3656 #endif
3657 } else {
3658 return ExtendedPC(NULL);
3659 }
3660 #endif
3661 }
3662
3663 // GetCurrentThreadId() returns DWORD
3664 intx os::current_thread_id() { return GetCurrentThreadId(); }
3665
3666 static int _initial_pid = 0;
3667
3668 int os::current_process_id()
3669 {
3670 return (_initial_pid ? _initial_pid : _getpid());
3671 }
3672
3673 int os::win32::_vm_page_size = 0;
3674 int os::win32::_vm_allocation_granularity = 0;
3675 int os::win32::_processor_type = 0;
3676 // Processor level is not available on non-NT systems, use vm_version instead
3677 int os::win32::_processor_level = 0;
3678 julong os::win32::_physical_memory = 0;
3679 size_t os::win32::_default_stack_size = 0;
3680
3681 intx os::win32::_os_thread_limit = 0;
3682 volatile intx os::win32::_os_thread_count = 0;
3683
3684 bool os::win32::_is_nt = false;
3685 bool os::win32::_is_windows_2003 = false;
3686 bool os::win32::_is_windows_server = false;
3687
3688 bool os::win32::_has_performance_count = 0;
3689
3690 void os::win32::initialize_system_info() {
3691 SYSTEM_INFO si;
3692 GetSystemInfo(&si);
3693 _vm_page_size = si.dwPageSize;
3694 _vm_allocation_granularity = si.dwAllocationGranularity;
3695 _processor_type = si.dwProcessorType;
3696 _processor_level = si.wProcessorLevel;
3697 set_processor_count(si.dwNumberOfProcessors);
3698
3699 MEMORYSTATUSEX ms;
3700 ms.dwLength = sizeof(ms);
3701
3702 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3703 // dwMemoryLoad (% of memory in use)
3704 GlobalMemoryStatusEx(&ms);
3705 _physical_memory = ms.ullTotalPhys;
3706
3707 OSVERSIONINFOEX oi;
3708 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3709 GetVersionEx((OSVERSIONINFO*)&oi);
3710 switch(oi.dwPlatformId) {
3711 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3712 case VER_PLATFORM_WIN32_NT:
3713 _is_nt = true;
3714 {
3715 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3716 if (os_vers == 5002) {
3717 _is_windows_2003 = true;
3718 }
3719 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3720 oi.wProductType == VER_NT_SERVER) {
3721 _is_windows_server = true;
3722 }
3723 }
3724 break;
3725 default: fatal("Unknown platform");
3726 }
3727
3728 _default_stack_size = os::current_stack_size();
3729 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3730 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3731 "stack size not a multiple of page size");
3732
3733 initialize_performance_counter();
3734
3735 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3736 // known to deadlock the system, if the VM issues to thread operations with
3737 // a too high frequency, e.g., such as changing the priorities.
3738 // The 6000 seems to work well - no deadlocks has been notices on the test
3739 // programs that we have seen experience this problem.
3740 if (!os::win32::is_nt()) {
3741 StarvationMonitorInterval = 6000;
3742 }
3743 }
3744
3745
3746 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3747 char path[MAX_PATH];
3748 DWORD size;
3749 DWORD pathLen = (DWORD)sizeof(path);
3750 HINSTANCE result = NULL;
3751
3752 // only allow library name without path component
3753 assert(strchr(name, '\\') == NULL, "path not allowed");
3754 assert(strchr(name, ':') == NULL, "path not allowed");
3755 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3756 jio_snprintf(ebuf, ebuflen,
3757 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3758 return NULL;
3759 }
3760
3761 // search system directory
3762 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3763 strcat(path, "\\");
3764 strcat(path, name);
3765 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3766 return result;
3767 }
3768 }
3769
3770 // try Windows directory
3771 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3772 strcat(path, "\\");
3773 strcat(path, name);
3774 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3775 return result;
3776 }
3777 }
3778
3779 jio_snprintf(ebuf, ebuflen,
3780 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3781 return NULL;
3782 }
3783
3784 void os::win32::setmode_streams() {
3785 _setmode(_fileno(stdin), _O_BINARY);
3786 _setmode(_fileno(stdout), _O_BINARY);
3787 _setmode(_fileno(stderr), _O_BINARY);
3788 }
3789
3790
3791 bool os::is_debugger_attached() {
3792 return IsDebuggerPresent() ? true : false;
3793 }
3794
3795
3796 void os::wait_for_keypress_at_exit(void) {
3797 if (PauseAtExit) {
3798 fprintf(stderr, "Press any key to continue...\n");
3799 fgetc(stdin);
3800 }
3801 }
3802
3803
3804 int os::message_box(const char* title, const char* message) {
3805 int result = MessageBox(NULL, message, title,
3806 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3807 return result == IDYES;
3808 }
3809
3810 int os::allocate_thread_local_storage() {
3811 return TlsAlloc();
3812 }
3813
3814
3815 void os::free_thread_local_storage(int index) {
3816 TlsFree(index);
3817 }
3818
3819
3820 void os::thread_local_storage_at_put(int index, void* value) {
3821 TlsSetValue(index, value);
3822 assert(thread_local_storage_at(index) == value, "Just checking");
3823 }
3824
3825
3826 void* os::thread_local_storage_at(int index) {
3827 return TlsGetValue(index);
3828 }
3829
3830
3831 #ifndef PRODUCT
3832 #ifndef _WIN64
3833 // Helpers to check whether NX protection is enabled
3834 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3835 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3836 pex->ExceptionRecord->NumberParameters > 0 &&
3837 pex->ExceptionRecord->ExceptionInformation[0] ==
3838 EXCEPTION_INFO_EXEC_VIOLATION) {
3839 return EXCEPTION_EXECUTE_HANDLER;
3840 }
3841 return EXCEPTION_CONTINUE_SEARCH;
3842 }
3843
3844 void nx_check_protection() {
3845 // If NX is enabled we'll get an exception calling into code on the stack
3846 char code[] = { (char)0xC3 }; // ret
3847 void *code_ptr = (void *)code;
3848 __try {
3849 __asm call code_ptr
3850 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3851 tty->print_raw_cr("NX protection detected.");
3852 }
3853 }
3854 #endif // _WIN64
3855 #endif // PRODUCT
3856
3857 // this is called _before_ the global arguments have been parsed
3858 void os::init(void) {
3859 _initial_pid = _getpid();
3860
3861 init_random(1234567);
3862
3863 win32::initialize_system_info();
3864 win32::setmode_streams();
3865 init_page_sizes((size_t) win32::vm_page_size());
3866
3867 // This may be overridden later when argument processing is done.
3868 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3869 os::win32::is_windows_2003());
3870
3871 // Initialize main_process and main_thread
3872 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3873 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3874 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3875 fatal("DuplicateHandle failed\n");
3876 }
3877 main_thread_id = (int) GetCurrentThreadId();
3878 }
3879
3880 // To install functions for atexit processing
3881 extern "C" {
3882 static void perfMemory_exit_helper() {
3883 perfMemory_exit();
3884 }
3885 }
3886
3887 static jint initSock();
3888
3889 // this is called _after_ the global arguments have been parsed
3890 jint os::init_2(void) {
3891 // Allocate a single page and mark it as readable for safepoint polling
3892 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3893 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3894
3895 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3896 guarantee( return_page != NULL, "Commit Failed for polling page");
3897
3898 os::set_polling_page( polling_page );
3899
3900 #ifndef PRODUCT
3901 if( Verbose && PrintMiscellaneous )
3902 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3903 #endif
3904
3905 if (!UseMembar) {
3906 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3907 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3908
3909 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3910 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3911
3912 os::set_memory_serialize_page( mem_serialize_page );
3913
3914 #ifndef PRODUCT
3915 if(Verbose && PrintMiscellaneous)
3916 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3917 #endif
3918 }
3919
3920 // Setup Windows Exceptions
3921
3922 // for debugging float code generation bugs
3923 if (ForceFloatExceptions) {
3924 #ifndef _WIN64
3925 static long fp_control_word = 0;
3926 __asm { fstcw fp_control_word }
3927 // see Intel PPro Manual, Vol. 2, p 7-16
3928 const long precision = 0x20;
3929 const long underflow = 0x10;
3930 const long overflow = 0x08;
3931 const long zero_div = 0x04;
3932 const long denorm = 0x02;
3933 const long invalid = 0x01;
3934 fp_control_word |= invalid;
3935 __asm { fldcw fp_control_word }
3936 #endif
3937 }
3938
3939 // If stack_commit_size is 0, windows will reserve the default size,
3940 // but only commit a small portion of it.
3941 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3942 size_t default_reserve_size = os::win32::default_stack_size();
3943 size_t actual_reserve_size = stack_commit_size;
3944 if (stack_commit_size < default_reserve_size) {
3945 // If stack_commit_size == 0, we want this too
3946 actual_reserve_size = default_reserve_size;
3947 }
3948
3949 // Check minimum allowable stack size for thread creation and to initialize
3950 // the java system classes, including StackOverflowError - depends on page
3951 // size. Add a page for compiler2 recursion in main thread.
3952 // Add in 2*BytesPerWord times page size to account for VM stack during
3953 // class initialization depending on 32 or 64 bit VM.
3954 size_t min_stack_allowed =
3955 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3956 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3957 if (actual_reserve_size < min_stack_allowed) {
3958 tty->print_cr("\nThe stack size specified is too small, "
3959 "Specify at least %dk",
3960 min_stack_allowed / K);
3961 return JNI_ERR;
3962 }
3963
3964 JavaThread::set_stack_size_at_create(stack_commit_size);
3965
3966 // Calculate theoretical max. size of Threads to guard gainst artifical
3967 // out-of-memory situations, where all available address-space has been
3968 // reserved by thread stacks.
3969 assert(actual_reserve_size != 0, "Must have a stack");
3970
3971 // Calculate the thread limit when we should start doing Virtual Memory
3972 // banging. Currently when the threads will have used all but 200Mb of space.
3973 //
3974 // TODO: consider performing a similar calculation for commit size instead
3975 // as reserve size, since on a 64-bit platform we'll run into that more
3976 // often than running out of virtual memory space. We can use the
3977 // lower value of the two calculations as the os_thread_limit.
3978 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3979 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3980
3981 // at exit methods are called in the reverse order of their registration.
3982 // there is no limit to the number of functions registered. atexit does
3983 // not set errno.
3984
3985 if (PerfAllowAtExitRegistration) {
3986 // only register atexit functions if PerfAllowAtExitRegistration is set.
3987 // atexit functions can be delayed until process exit time, which
3988 // can be problematic for embedded VM situations. Embedded VMs should
3989 // call DestroyJavaVM() to assure that VM resources are released.
3990
3991 // note: perfMemory_exit_helper atexit function may be removed in
3992 // the future if the appropriate cleanup code can be added to the
3993 // VM_Exit VMOperation's doit method.
3994 if (atexit(perfMemory_exit_helper) != 0) {
3995 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3996 }
3997 }
3998
3999 #ifndef _WIN64
4000 // Print something if NX is enabled (win32 on AMD64)
4001 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4002 #endif
4003
4004 // initialize thread priority policy
4005 prio_init();
4006
4007 if (UseNUMA && !ForceNUMA) {
4008 UseNUMA = false; // We don't fully support this yet
4009 }
4010
4011 if (UseNUMAInterleaving) {
4012 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4013 bool success = numa_interleaving_init();
4014 if (!success) UseNUMAInterleaving = false;
4015 }
4016
4017 if (initSock() != JNI_OK) {
4018 return JNI_ERR;
4019 }
4020
4021 return JNI_OK;
4022 }
4023
4024 void os::init_3(void) {
4025 return;
4026 }
4027
4028 // Mark the polling page as unreadable
4029 void os::make_polling_page_unreadable(void) {
4030 DWORD old_status;
4031 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4032 fatal("Could not disable polling page");
4033 };
4034
4035 // Mark the polling page as readable
4036 void os::make_polling_page_readable(void) {
4037 DWORD old_status;
4038 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4039 fatal("Could not enable polling page");
4040 };
4041
4042
4043 int os::stat(const char *path, struct stat *sbuf) {
4044 char pathbuf[MAX_PATH];
4045 if (strlen(path) > MAX_PATH - 1) {
4046 errno = ENAMETOOLONG;
4047 return -1;
4048 }
4049 os::native_path(strcpy(pathbuf, path));
4050 int ret = ::stat(pathbuf, sbuf);
4051 if (sbuf != NULL && UseUTCFileTimestamp) {
4052 // Fix for 6539723. st_mtime returned from stat() is dependent on
4053 // the system timezone and so can return different values for the
4054 // same file if/when daylight savings time changes. This adjustment
4055 // makes sure the same timestamp is returned regardless of the TZ.
4056 //
4057 // See:
4058 // http://msdn.microsoft.com/library/
4059 // default.asp?url=/library/en-us/sysinfo/base/
4060 // time_zone_information_str.asp
4061 // and
4062 // http://msdn.microsoft.com/library/default.asp?url=
4063 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4064 //
4065 // NOTE: there is a insidious bug here: If the timezone is changed
4066 // after the call to stat() but before 'GetTimeZoneInformation()', then
4067 // the adjustment we do here will be wrong and we'll return the wrong
4068 // value (which will likely end up creating an invalid class data
4069 // archive). Absent a better API for this, or some time zone locking
4070 // mechanism, we'll have to live with this risk.
4071 TIME_ZONE_INFORMATION tz;
4072 DWORD tzid = GetTimeZoneInformation(&tz);
4073 int daylightBias =
4074 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4075 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4076 }
4077 return ret;
4078 }
4079
4080
4081 #define FT2INT64(ft) \
4082 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4083
4084
4085 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4086 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4087 // of a thread.
4088 //
4089 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4090 // the fast estimate available on the platform.
4091
4092 // current_thread_cpu_time() is not optimized for Windows yet
4093 jlong os::current_thread_cpu_time() {
4094 // return user + sys since the cost is the same
4095 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4096 }
4097
4098 jlong os::thread_cpu_time(Thread* thread) {
4099 // consistent with what current_thread_cpu_time() returns.
4100 return os::thread_cpu_time(thread, true /* user+sys */);
4101 }
4102
4103 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4104 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4105 }
4106
4107 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4108 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4109 // If this function changes, os::is_thread_cpu_time_supported() should too
4110 if (os::win32::is_nt()) {
4111 FILETIME CreationTime;
4112 FILETIME ExitTime;
4113 FILETIME KernelTime;
4114 FILETIME UserTime;
4115
4116 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4117 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4118 return -1;
4119 else
4120 if (user_sys_cpu_time) {
4121 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4122 } else {
4123 return FT2INT64(UserTime) * 100;
4124 }
4125 } else {
4126 return (jlong) timeGetTime() * 1000000;
4127 }
4128 }
4129
4130 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4131 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4132 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4133 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4134 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4135 }
4136
4137 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4138 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4139 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4140 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4141 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4142 }
4143
4144 bool os::is_thread_cpu_time_supported() {
4145 // see os::thread_cpu_time
4146 if (os::win32::is_nt()) {
4147 FILETIME CreationTime;
4148 FILETIME ExitTime;
4149 FILETIME KernelTime;
4150 FILETIME UserTime;
4151
4152 if ( GetThreadTimes(GetCurrentThread(),
4153 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4154 return false;
4155 else
4156 return true;
4157 } else {
4158 return false;
4159 }
4160 }
4161
4162 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4163 // It does have primitives (PDH API) to get CPU usage and run queue length.
4164 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4165 // If we wanted to implement loadavg on Windows, we have a few options:
4166 //
4167 // a) Query CPU usage and run queue length and "fake" an answer by
4168 // returning the CPU usage if it's under 100%, and the run queue
4169 // length otherwise. It turns out that querying is pretty slow
4170 // on Windows, on the order of 200 microseconds on a fast machine.
4171 // Note that on the Windows the CPU usage value is the % usage
4172 // since the last time the API was called (and the first call
4173 // returns 100%), so we'd have to deal with that as well.
4174 //
4175 // b) Sample the "fake" answer using a sampling thread and store
4176 // the answer in a global variable. The call to loadavg would
4177 // just return the value of the global, avoiding the slow query.
4178 //
4179 // c) Sample a better answer using exponential decay to smooth the
4180 // value. This is basically the algorithm used by UNIX kernels.
4181 //
4182 // Note that sampling thread starvation could affect both (b) and (c).
4183 int os::loadavg(double loadavg[], int nelem) {
4184 return -1;
4185 }
4186
4187
4188 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4189 bool os::dont_yield() {
4190 return DontYieldALot;
4191 }
4192
4193 // This method is a slightly reworked copy of JDK's sysOpen
4194 // from src/windows/hpi/src/sys_api_md.c
4195
4196 int os::open(const char *path, int oflag, int mode) {
4197 char pathbuf[MAX_PATH];
4198
4199 if (strlen(path) > MAX_PATH - 1) {
4200 errno = ENAMETOOLONG;
4201 return -1;
4202 }
4203 os::native_path(strcpy(pathbuf, path));
4204 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4205 }
4206
4207 FILE* os::open(int fd, const char* mode) {
4208 return ::_fdopen(fd, mode);
4209 }
4210
4211 // Is a (classpath) directory empty?
4212 bool os::dir_is_empty(const char* path) {
4213 WIN32_FIND_DATA fd;
4214 HANDLE f = FindFirstFile(path, &fd);
4215 if (f == INVALID_HANDLE_VALUE) {
4216 return true;
4217 }
4218 FindClose(f);
4219 return false;
4220 }
4221
4222 // create binary file, rewriting existing file if required
4223 int os::create_binary_file(const char* path, bool rewrite_existing) {
4224 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4225 if (!rewrite_existing) {
4226 oflags |= _O_EXCL;
4227 }
4228 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4229 }
4230
4231 // return current position of file pointer
4232 jlong os::current_file_offset(int fd) {
4233 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4234 }
4235
4236 // move file pointer to the specified offset
4237 jlong os::seek_to_file_offset(int fd, jlong offset) {
4238 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4239 }
4240
4241
4242 jlong os::lseek(int fd, jlong offset, int whence) {
4243 return (jlong) ::_lseeki64(fd, offset, whence);
4244 }
4245
4246 // This method is a slightly reworked copy of JDK's sysNativePath
4247 // from src/windows/hpi/src/path_md.c
4248
4249 /* Convert a pathname to native format. On win32, this involves forcing all
4250 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4251 sometimes rejects '/') and removing redundant separators. The input path is
4252 assumed to have been converted into the character encoding used by the local
4253 system. Because this might be a double-byte encoding, care is taken to
4254 treat double-byte lead characters correctly.
4255
4256 This procedure modifies the given path in place, as the result is never
4257 longer than the original. There is no error return; this operation always
4258 succeeds. */
4259 char * os::native_path(char *path) {
4260 char *src = path, *dst = path, *end = path;
4261 char *colon = NULL; /* If a drive specifier is found, this will
4262 point to the colon following the drive
4263 letter */
4264
4265 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4266 assert(((!::IsDBCSLeadByte('/'))
4267 && (!::IsDBCSLeadByte('\\'))
4268 && (!::IsDBCSLeadByte(':'))),
4269 "Illegal lead byte");
4270
4271 /* Check for leading separators */
4272 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4273 while (isfilesep(*src)) {
4274 src++;
4275 }
4276
4277 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4278 /* Remove leading separators if followed by drive specifier. This
4279 hack is necessary to support file URLs containing drive
4280 specifiers (e.g., "file://c:/path"). As a side effect,
4281 "/c:/path" can be used as an alternative to "c:/path". */
4282 *dst++ = *src++;
4283 colon = dst;
4284 *dst++ = ':';
4285 src++;
4286 } else {
4287 src = path;
4288 if (isfilesep(src[0]) && isfilesep(src[1])) {
4289 /* UNC pathname: Retain first separator; leave src pointed at
4290 second separator so that further separators will be collapsed
4291 into the second separator. The result will be a pathname
4292 beginning with "\\\\" followed (most likely) by a host name. */
4293 src = dst = path + 1;
4294 path[0] = '\\'; /* Force first separator to '\\' */
4295 }
4296 }
4297
4298 end = dst;
4299
4300 /* Remove redundant separators from remainder of path, forcing all
4301 separators to be '\\' rather than '/'. Also, single byte space
4302 characters are removed from the end of the path because those
4303 are not legal ending characters on this operating system.
4304 */
4305 while (*src != '\0') {
4306 if (isfilesep(*src)) {
4307 *dst++ = '\\'; src++;
4308 while (isfilesep(*src)) src++;
4309 if (*src == '\0') {
4310 /* Check for trailing separator */
4311 end = dst;
4312 if (colon == dst - 2) break; /* "z:\\" */
4313 if (dst == path + 1) break; /* "\\" */
4314 if (dst == path + 2 && isfilesep(path[0])) {
4315 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4316 beginning of a UNC pathname. Even though it is not, by
4317 itself, a valid UNC pathname, we leave it as is in order
4318 to be consistent with the path canonicalizer as well
4319 as the win32 APIs, which treat this case as an invalid
4320 UNC pathname rather than as an alias for the root
4321 directory of the current drive. */
4322 break;
4323 }
4324 end = --dst; /* Path does not denote a root directory, so
4325 remove trailing separator */
4326 break;
4327 }
4328 end = dst;
4329 } else {
4330 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4331 *dst++ = *src++;
4332 if (*src) *dst++ = *src++;
4333 end = dst;
4334 } else { /* Copy a single-byte character */
4335 char c = *src++;
4336 *dst++ = c;
4337 /* Space is not a legal ending character */
4338 if (c != ' ') end = dst;
4339 }
4340 }
4341 }
4342
4343 *end = '\0';
4344
4345 /* For "z:", add "." to work around a bug in the C runtime library */
4346 if (colon == dst - 1) {
4347 path[2] = '.';
4348 path[3] = '\0';
4349 }
4350
4351 return path;
4352 }
4353
4354 // This code is a copy of JDK's sysSetLength
4355 // from src/windows/hpi/src/sys_api_md.c
4356
4357 int os::ftruncate(int fd, jlong length) {
4358 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4359 long high = (long)(length >> 32);
4360 DWORD ret;
4361
4362 if (h == (HANDLE)(-1)) {
4363 return -1;
4364 }
4365
4366 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4367 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4368 return -1;
4369 }
4370
4371 if (::SetEndOfFile(h) == FALSE) {
4372 return -1;
4373 }
4374
4375 return 0;
4376 }
4377
4378
4379 // This code is a copy of JDK's sysSync
4380 // from src/windows/hpi/src/sys_api_md.c
4381 // except for the legacy workaround for a bug in Win 98
4382
4383 int os::fsync(int fd) {
4384 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4385
4386 if ( (!::FlushFileBuffers(handle)) &&
4387 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4388 /* from winerror.h */
4389 return -1;
4390 }
4391 return 0;
4392 }
4393
4394 static int nonSeekAvailable(int, long *);
4395 static int stdinAvailable(int, long *);
4396
4397 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4398 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4399
4400 // This code is a copy of JDK's sysAvailable
4401 // from src/windows/hpi/src/sys_api_md.c
4402
4403 int os::available(int fd, jlong *bytes) {
4404 jlong cur, end;
4405 struct _stati64 stbuf64;
4406
4407 if (::_fstati64(fd, &stbuf64) >= 0) {
4408 int mode = stbuf64.st_mode;
4409 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4410 int ret;
4411 long lpbytes;
4412 if (fd == 0) {
4413 ret = stdinAvailable(fd, &lpbytes);
4414 } else {
4415 ret = nonSeekAvailable(fd, &lpbytes);
4416 }
4417 (*bytes) = (jlong)(lpbytes);
4418 return ret;
4419 }
4420 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4421 return FALSE;
4422 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4423 return FALSE;
4424 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4425 return FALSE;
4426 }
4427 *bytes = end - cur;
4428 return TRUE;
4429 } else {
4430 return FALSE;
4431 }
4432 }
4433
4434 // This code is a copy of JDK's nonSeekAvailable
4435 // from src/windows/hpi/src/sys_api_md.c
4436
4437 static int nonSeekAvailable(int fd, long *pbytes) {
4438 /* This is used for available on non-seekable devices
4439 * (like both named and anonymous pipes, such as pipes
4440 * connected to an exec'd process).
4441 * Standard Input is a special case.
4442 *
4443 */
4444 HANDLE han;
4445
4446 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4447 return FALSE;
4448 }
4449
4450 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4451 /* PeekNamedPipe fails when at EOF. In that case we
4452 * simply make *pbytes = 0 which is consistent with the
4453 * behavior we get on Solaris when an fd is at EOF.
4454 * The only alternative is to raise an Exception,
4455 * which isn't really warranted.
4456 */
4457 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4458 return FALSE;
4459 }
4460 *pbytes = 0;
4461 }
4462 return TRUE;
4463 }
4464
4465 #define MAX_INPUT_EVENTS 2000
4466
4467 // This code is a copy of JDK's stdinAvailable
4468 // from src/windows/hpi/src/sys_api_md.c
4469
4470 static int stdinAvailable(int fd, long *pbytes) {
4471 HANDLE han;
4472 DWORD numEventsRead = 0; /* Number of events read from buffer */
4473 DWORD numEvents = 0; /* Number of events in buffer */
4474 DWORD i = 0; /* Loop index */
4475 DWORD curLength = 0; /* Position marker */
4476 DWORD actualLength = 0; /* Number of bytes readable */
4477 BOOL error = FALSE; /* Error holder */
4478 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4479
4480 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4481 return FALSE;
4482 }
4483
4484 /* Construct an array of input records in the console buffer */
4485 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4486 if (error == 0) {
4487 return nonSeekAvailable(fd, pbytes);
4488 }
4489
4490 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4491 if (numEvents > MAX_INPUT_EVENTS) {
4492 numEvents = MAX_INPUT_EVENTS;
4493 }
4494
4495 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4496 if (lpBuffer == NULL) {
4497 return FALSE;
4498 }
4499
4500 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4501 if (error == 0) {
4502 os::free(lpBuffer, mtInternal);
4503 return FALSE;
4504 }
4505
4506 /* Examine input records for the number of bytes available */
4507 for(i=0; i<numEvents; i++) {
4508 if (lpBuffer[i].EventType == KEY_EVENT) {
4509
4510 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4511 &(lpBuffer[i].Event);
4512 if (keyRecord->bKeyDown == TRUE) {
4513 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4514 curLength++;
4515 if (*keyPressed == '\r') {
4516 actualLength = curLength;
4517 }
4518 }
4519 }
4520 }
4521
4522 if(lpBuffer != NULL) {
4523 os::free(lpBuffer, mtInternal);
4524 }
4525
4526 *pbytes = (long) actualLength;
4527 return TRUE;
4528 }
4529
4530 // Map a block of memory.
4531 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4532 char *addr, size_t bytes, bool read_only,
4533 bool allow_exec) {
4534 HANDLE hFile;
4535 char* base;
4536
4537 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4538 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4539 if (hFile == NULL) {
4540 if (PrintMiscellaneous && Verbose) {
4541 DWORD err = GetLastError();
4542 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4543 }
4544 return NULL;
4545 }
4546
4547 if (allow_exec) {
4548 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4549 // unless it comes from a PE image (which the shared archive is not.)
4550 // Even VirtualProtect refuses to give execute access to mapped memory
4551 // that was not previously executable.
4552 //
4553 // Instead, stick the executable region in anonymous memory. Yuck.
4554 // Penalty is that ~4 pages will not be shareable - in the future
4555 // we might consider DLLizing the shared archive with a proper PE
4556 // header so that mapping executable + sharing is possible.
4557
4558 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4559 PAGE_READWRITE);
4560 if (base == NULL) {
4561 if (PrintMiscellaneous && Verbose) {
4562 DWORD err = GetLastError();
4563 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4564 }
4565 CloseHandle(hFile);
4566 return NULL;
4567 }
4568
4569 DWORD bytes_read;
4570 OVERLAPPED overlapped;
4571 overlapped.Offset = (DWORD)file_offset;
4572 overlapped.OffsetHigh = 0;
4573 overlapped.hEvent = NULL;
4574 // ReadFile guarantees that if the return value is true, the requested
4575 // number of bytes were read before returning.
4576 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4577 if (!res) {
4578 if (PrintMiscellaneous && Verbose) {
4579 DWORD err = GetLastError();
4580 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4581 }
4582 release_memory(base, bytes);
4583 CloseHandle(hFile);
4584 return NULL;
4585 }
4586 } else {
4587 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4588 NULL /*file_name*/);
4589 if (hMap == NULL) {
4590 if (PrintMiscellaneous && Verbose) {
4591 DWORD err = GetLastError();
4592 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4593 }
4594 CloseHandle(hFile);
4595 return NULL;
4596 }
4597
4598 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4599 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4600 (DWORD)bytes, addr);
4601 if (base == NULL) {
4602 if (PrintMiscellaneous && Verbose) {
4603 DWORD err = GetLastError();
4604 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4605 }
4606 CloseHandle(hMap);
4607 CloseHandle(hFile);
4608 return NULL;
4609 }
4610
4611 if (CloseHandle(hMap) == 0) {
4612 if (PrintMiscellaneous && Verbose) {
4613 DWORD err = GetLastError();
4614 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4615 }
4616 CloseHandle(hFile);
4617 return base;
4618 }
4619 }
4620
4621 if (allow_exec) {
4622 DWORD old_protect;
4623 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4624 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4625
4626 if (!res) {
4627 if (PrintMiscellaneous && Verbose) {
4628 DWORD err = GetLastError();
4629 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4630 }
4631 // Don't consider this a hard error, on IA32 even if the
4632 // VirtualProtect fails, we should still be able to execute
4633 CloseHandle(hFile);
4634 return base;
4635 }
4636 }
4637
4638 if (CloseHandle(hFile) == 0) {
4639 if (PrintMiscellaneous && Verbose) {
4640 DWORD err = GetLastError();
4641 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4642 }
4643 return base;
4644 }
4645
4646 return base;
4647 }
4648
4649
4650 // Remap a block of memory.
4651 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4652 char *addr, size_t bytes, bool read_only,
4653 bool allow_exec) {
4654 // This OS does not allow existing memory maps to be remapped so we
4655 // have to unmap the memory before we remap it.
4656 if (!os::unmap_memory(addr, bytes)) {
4657 return NULL;
4658 }
4659
4660 // There is a very small theoretical window between the unmap_memory()
4661 // call above and the map_memory() call below where a thread in native
4662 // code may be able to access an address that is no longer mapped.
4663
4664 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4665 read_only, allow_exec);
4666 }
4667
4668
4669 // Unmap a block of memory.
4670 // Returns true=success, otherwise false.
4671
4672 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4673 BOOL result = UnmapViewOfFile(addr);
4674 if (result == 0) {
4675 if (PrintMiscellaneous && Verbose) {
4676 DWORD err = GetLastError();
4677 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4678 }
4679 return false;
4680 }
4681 return true;
4682 }
4683
4684 void os::pause() {
4685 char filename[MAX_PATH];
4686 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4687 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4688 } else {
4689 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4690 }
4691
4692 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4693 if (fd != -1) {
4694 struct stat buf;
4695 ::close(fd);
4696 while (::stat(filename, &buf) == 0) {
4697 Sleep(100);
4698 }
4699 } else {
4700 jio_fprintf(stderr,
4701 "Could not open pause file '%s', continuing immediately.\n", filename);
4702 }
4703 }
4704
4705 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4706 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4707 }
4708
4709 /*
4710 * See the caveats for this class in os_windows.hpp
4711 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4712 * into this method and returns false. If no OS EXCEPTION was raised, returns
4713 * true.
4714 * The callback is supposed to provide the method that should be protected.
4715 */
4716 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4717 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4718 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4719 "crash_protection already set?");
4720
4721 bool success = true;
4722 __try {
4723 WatcherThread::watcher_thread()->set_crash_protection(this);
4724 cb.call();
4725 } __except(EXCEPTION_EXECUTE_HANDLER) {
4726 // only for protection, nothing to do
4727 success = false;
4728 }
4729 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4730 return success;
4731 }
4732
4733 // An Event wraps a win32 "CreateEvent" kernel handle.
4734 //
4735 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4736 //
4737 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4738 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4739 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4740 // In addition, an unpark() operation might fetch the handle field, but the
4741 // event could recycle between the fetch and the SetEvent() operation.
4742 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4743 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4744 // on an stale but recycled handle would be harmless, but in practice this might
4745 // confuse other non-Sun code, so it's not a viable approach.
4746 //
4747 // 2: Once a win32 event handle is associated with an Event, it remains associated
4748 // with the Event. The event handle is never closed. This could be construed
4749 // as handle leakage, but only up to the maximum # of threads that have been extant
4750 // at any one time. This shouldn't be an issue, as windows platforms typically
4751 // permit a process to have hundreds of thousands of open handles.
4752 //
4753 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4754 // and release unused handles.
4755 //
4756 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4757 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4758 //
4759 // 5. Use an RCU-like mechanism (Read-Copy Update).
4760 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4761 //
4762 // We use (2).
4763 //
4764 // TODO-FIXME:
4765 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4766 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4767 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4768 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4769 // into a single win32 CreateEvent() handle.
4770 //
4771 // _Event transitions in park()
4772 // -1 => -1 : illegal
4773 // 1 => 0 : pass - return immediately
4774 // 0 => -1 : block
4775 //
4776 // _Event serves as a restricted-range semaphore :
4777 // -1 : thread is blocked
4778 // 0 : neutral - thread is running or ready
4779 // 1 : signaled - thread is running or ready
4780 //
4781 // Another possible encoding of _Event would be
4782 // with explicit "PARKED" and "SIGNALED" bits.
4783
4784 int os::PlatformEvent::park (jlong Millis) {
4785 guarantee (_ParkHandle != NULL , "Invariant") ;
4786 guarantee (Millis > 0 , "Invariant") ;
4787 int v ;
4788
4789 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4790 // the initial park() operation.
4791
4792 for (;;) {
4793 v = _Event ;
4794 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4795 }
4796 guarantee ((v == 0) || (v == 1), "invariant") ;
4797 if (v != 0) return OS_OK ;
4798
4799 // Do this the hard way by blocking ...
4800 // TODO: consider a brief spin here, gated on the success of recent
4801 // spin attempts by this thread.
4802 //
4803 // We decompose long timeouts into series of shorter timed waits.
4804 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4805 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4806 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4807 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4808 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4809 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4810 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4811 // for the already waited time. This policy does not admit any new outcomes.
4812 // In the future, however, we might want to track the accumulated wait time and
4813 // adjust Millis accordingly if we encounter a spurious wakeup.
4814
4815 const int MAXTIMEOUT = 0x10000000 ;
4816 DWORD rv = WAIT_TIMEOUT ;
4817 while (_Event < 0 && Millis > 0) {
4818 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4819 if (Millis > MAXTIMEOUT) {
4820 prd = MAXTIMEOUT ;
4821 }
4822 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4823 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4824 if (rv == WAIT_TIMEOUT) {
4825 Millis -= prd ;
4826 }
4827 }
4828 v = _Event ;
4829 _Event = 0 ;
4830 // see comment at end of os::PlatformEvent::park() below:
4831 OrderAccess::fence() ;
4832 // If we encounter a nearly simultanous timeout expiry and unpark()
4833 // we return OS_OK indicating we awoke via unpark().
4834 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4835 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4836 }
4837
4838 void os::PlatformEvent::park () {
4839 guarantee (_ParkHandle != NULL, "Invariant") ;
4840 // Invariant: Only the thread associated with the Event/PlatformEvent
4841 // may call park().
4842 int v ;
4843 for (;;) {
4844 v = _Event ;
4845 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4846 }
4847 guarantee ((v == 0) || (v == 1), "invariant") ;
4848 if (v != 0) return ;
4849
4850 // Do this the hard way by blocking ...
4851 // TODO: consider a brief spin here, gated on the success of recent
4852 // spin attempts by this thread.
4853 while (_Event < 0) {
4854 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4855 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4856 }
4857
4858 // Usually we'll find _Event == 0 at this point, but as
4859 // an optional optimization we clear it, just in case can
4860 // multiple unpark() operations drove _Event up to 1.
4861 _Event = 0 ;
4862 OrderAccess::fence() ;
4863 guarantee (_Event >= 0, "invariant") ;
4864 }
4865
4866 void os::PlatformEvent::unpark() {
4867 guarantee (_ParkHandle != NULL, "Invariant") ;
4868
4869 // Transitions for _Event:
4870 // 0 :=> 1
4871 // 1 :=> 1
4872 // -1 :=> either 0 or 1; must signal target thread
4873 // That is, we can safely transition _Event from -1 to either
4874 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4875 // unpark() calls.
4876 // See also: "Semaphores in Plan 9" by Mullender & Cox
4877 //
4878 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4879 // that it will take two back-to-back park() calls for the owning
4880 // thread to block. This has the benefit of forcing a spurious return
4881 // from the first park() call after an unpark() call which will help
4882 // shake out uses of park() and unpark() without condition variables.
4883
4884 if (Atomic::xchg(1, &_Event) >= 0) return;
4885
4886 ::SetEvent(_ParkHandle);
4887 }
4888
4889
4890 // JSR166
4891 // -------------------------------------------------------
4892
4893 /*
4894 * The Windows implementation of Park is very straightforward: Basic
4895 * operations on Win32 Events turn out to have the right semantics to
4896 * use them directly. We opportunistically resuse the event inherited
4897 * from Monitor.
4898 */
4899
4900
4901 void Parker::park(bool isAbsolute, jlong time) {
4902 guarantee (_ParkEvent != NULL, "invariant") ;
4903 // First, demultiplex/decode time arguments
4904 if (time < 0) { // don't wait
4905 return;
4906 }
4907 else if (time == 0 && !isAbsolute) {
4908 time = INFINITE;
4909 }
4910 else if (isAbsolute) {
4911 time -= os::javaTimeMillis(); // convert to relative time
4912 if (time <= 0) // already elapsed
4913 return;
4914 }
4915 else { // relative
4916 time /= 1000000; // Must coarsen from nanos to millis
4917 if (time == 0) // Wait for the minimal time unit if zero
4918 time = 1;
4919 }
4920
4921 JavaThread* thread = (JavaThread*)(Thread::current());
4922 assert(thread->is_Java_thread(), "Must be JavaThread");
4923 JavaThread *jt = (JavaThread *)thread;
4924
4925 // Don't wait if interrupted or already triggered
4926 if (Thread::is_interrupted(thread, false) ||
4927 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4928 ResetEvent(_ParkEvent);
4929 return;
4930 }
4931 else {
4932 ThreadBlockInVM tbivm(jt);
4933 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4934 jt->set_suspend_equivalent();
4935
4936 WaitForSingleObject(_ParkEvent, time);
4937 ResetEvent(_ParkEvent);
4938
4939 // If externally suspended while waiting, re-suspend
4940 if (jt->handle_special_suspend_equivalent_condition()) {
4941 jt->java_suspend_self();
4942 }
4943 }
4944 }
4945
4946 void Parker::unpark() {
4947 guarantee (_ParkEvent != NULL, "invariant") ;
4948 SetEvent(_ParkEvent);
4949 }
4950
4951 // Run the specified command in a separate process. Return its exit value,
4952 // or -1 on failure (e.g. can't create a new process).
4953 int os::fork_and_exec(char* cmd) {
4954 STARTUPINFO si;
4955 PROCESS_INFORMATION pi;
4956
4957 memset(&si, 0, sizeof(si));
4958 si.cb = sizeof(si);
4959 memset(&pi, 0, sizeof(pi));
4960 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4961 cmd, // command line
4962 NULL, // process security attribute
4963 NULL, // thread security attribute
4964 TRUE, // inherits system handles
4965 0, // no creation flags
4966 NULL, // use parent's environment block
4967 NULL, // use parent's starting directory
4968 &si, // (in) startup information
4969 &pi); // (out) process information
4970
4971 if (rslt) {
4972 // Wait until child process exits.
4973 WaitForSingleObject(pi.hProcess, INFINITE);
4974
4975 DWORD exit_code;
4976 GetExitCodeProcess(pi.hProcess, &exit_code);
4977
4978 // Close process and thread handles.
4979 CloseHandle(pi.hProcess);
4980 CloseHandle(pi.hThread);
4981
4982 return (int)exit_code;
4983 } else {
4984 return -1;
4985 }
4986 }
4987
4988 //--------------------------------------------------------------------------------------------------
4989 // Non-product code
4990
4991 static int mallocDebugIntervalCounter = 0;
4992 static int mallocDebugCounter = 0;
4993 bool os::check_heap(bool force) {
4994 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4995 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4996 // Note: HeapValidate executes two hardware breakpoints when it finds something
4997 // wrong; at these points, eax contains the address of the offending block (I think).
4998 // To get to the exlicit error message(s) below, just continue twice.
4999 HANDLE heap = GetProcessHeap();
5000 { HeapLock(heap);
5001 PROCESS_HEAP_ENTRY phe;
5002 phe.lpData = NULL;
5003 while (HeapWalk(heap, &phe) != 0) {
5004 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5005 !HeapValidate(heap, 0, phe.lpData)) {
5006 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5007 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5008 fatal("corrupted C heap");
5009 }
5010 }
5011 DWORD err = GetLastError();
5012 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5013 fatal(err_msg("heap walk aborted with error %d", err));
5014 }
5015 HeapUnlock(heap);
5016 }
5017 mallocDebugIntervalCounter = 0;
5018 }
5019 return true;
5020 }
5021
5022
5023 bool os::find(address addr, outputStream* st) {
5024 // Nothing yet
5025 return false;
5026 }
5027
5028 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5029 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5030
5031 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5032 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5033 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5034 address addr = (address) exceptionRecord->ExceptionInformation[1];
5035
5036 if (os::is_memory_serialize_page(thread, addr))
5037 return EXCEPTION_CONTINUE_EXECUTION;
5038 }
5039
5040 return EXCEPTION_CONTINUE_SEARCH;
5041 }
5042
5043 // We don't build a headless jre for Windows
5044 bool os::is_headless_jre() { return false; }
5045
5046 static jint initSock() {
5047 WSADATA wsadata;
5048
5049 if (!os::WinSock2Dll::WinSock2Available()) {
5050 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5051 ::GetLastError());
5052 return JNI_ERR;
5053 }
5054
5055 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5056 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5057 ::GetLastError());
5058 return JNI_ERR;
5059 }
5060 return JNI_OK;
5061 }
5062
5063 struct hostent* os::get_host_by_name(char* name) {
5064 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5065 }
5066
5067 int os::socket_close(int fd) {
5068 return ::closesocket(fd);
5069 }
5070
5071 int os::socket_available(int fd, jint *pbytes) {
5072 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5073 return (ret < 0) ? 0 : 1;
5074 }
5075
5076 int os::socket(int domain, int type, int protocol) {
5077 return ::socket(domain, type, protocol);
5078 }
5079
5080 int os::listen(int fd, int count) {
5081 return ::listen(fd, count);
5082 }
5083
5084 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5085 return ::connect(fd, him, len);
5086 }
5087
5088 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5089 return ::accept(fd, him, len);
5090 }
5091
5092 int os::sendto(int fd, char* buf, size_t len, uint flags,
5093 struct sockaddr* to, socklen_t tolen) {
5094
5095 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5096 }
5097
5098 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5099 sockaddr* from, socklen_t* fromlen) {
5100
5101 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5102 }
5103
5104 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5105 return ::recv(fd, buf, (int)nBytes, flags);
5106 }
5107
5108 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5109 return ::send(fd, buf, (int)nBytes, flags);
5110 }
5111
5112 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5113 return ::send(fd, buf, (int)nBytes, flags);
5114 }
5115
5116 int os::timeout(int fd, long timeout) {
5117 fd_set tbl;
5118 struct timeval t;
5119
5120 t.tv_sec = timeout / 1000;
5121 t.tv_usec = (timeout % 1000) * 1000;
5122
5123 tbl.fd_count = 1;
5124 tbl.fd_array[0] = fd;
5125
5126 return ::select(1, &tbl, 0, 0, &t);
5127 }
5128
5129 int os::get_host_name(char* name, int namelen) {
5130 return ::gethostname(name, namelen);
5131 }
5132
5133 int os::socket_shutdown(int fd, int howto) {
5134 return ::shutdown(fd, howto);
5135 }
5136
5137 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5138 return ::bind(fd, him, len);
5139 }
5140
5141 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5142 return ::getsockname(fd, him, len);
5143 }
5144
5145 int os::get_sock_opt(int fd, int level, int optname,
5146 char* optval, socklen_t* optlen) {
5147 return ::getsockopt(fd, level, optname, optval, optlen);
5148 }
5149
5150 int os::set_sock_opt(int fd, int level, int optname,
5151 const char* optval, socklen_t optlen) {
5152 return ::setsockopt(fd, level, optname, optval, optlen);
5153 }
5154
5155 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5156 #if defined(IA32)
5157 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5158 #elif defined (AMD64)
5159 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5160 #endif
5161
5162 // returns true if thread could be suspended,
5163 // false otherwise
5164 static bool do_suspend(HANDLE* h) {
5165 if (h != NULL) {
5166 if (SuspendThread(*h) != ~0) {
5167 return true;
5168 }
5169 }
5170 return false;
5171 }
5172
5173 // resume the thread
5174 // calling resume on an active thread is a no-op
5175 static void do_resume(HANDLE* h) {
5176 if (h != NULL) {
5177 ResumeThread(*h);
5178 }
5179 }
5180
5181 // retrieve a suspend/resume context capable handle
5182 // from the tid. Caller validates handle return value.
5183 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5184 if (h != NULL) {
5185 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5186 }
5187 }
5188
5189 //
5190 // Thread sampling implementation
5191 //
5192 void os::SuspendedThreadTask::internal_do_task() {
5193 CONTEXT ctxt;
5194 HANDLE h = NULL;
5195
5196 // get context capable handle for thread
5197 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5198
5199 // sanity
5200 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5201 return;
5202 }
5203
5204 // suspend the thread
5205 if (do_suspend(&h)) {
5206 ctxt.ContextFlags = sampling_context_flags;
5207 // get thread context
5208 GetThreadContext(h, &ctxt);
5209 SuspendedThreadTaskContext context(_thread, &ctxt);
5210 // pass context to Thread Sampling impl
5211 do_task(context);
5212 // resume thread
5213 do_resume(&h);
5214 }
5215
5216 // close handle
5217 CloseHandle(h);
5218 }
5219
5220
5221 // Kernel32 API
5222 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5223 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5224 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5225 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5226 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5227
5228 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5229 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5230 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5231 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5232 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5233
5234
5235 BOOL os::Kernel32Dll::initialized = FALSE;
5236 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5237 assert(initialized && _GetLargePageMinimum != NULL,
5238 "GetLargePageMinimumAvailable() not yet called");
5239 return _GetLargePageMinimum();
5240 }
5241
5242 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5243 if (!initialized) {
5244 initialize();
5245 }
5246 return _GetLargePageMinimum != NULL;
5247 }
5248
5249 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5250 if (!initialized) {
5251 initialize();
5252 }
5253 return _VirtualAllocExNuma != NULL;
5254 }
5255
5256 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5257 assert(initialized && _VirtualAllocExNuma != NULL,
5258 "NUMACallsAvailable() not yet called");
5259
5260 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5261 }
5262
5263 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5264 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5265 "NUMACallsAvailable() not yet called");
5266
5267 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5268 }
5269
5270 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5271 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5272 "NUMACallsAvailable() not yet called");
5273
5274 return _GetNumaNodeProcessorMask(node, proc_mask);
5275 }
5276
5277 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5278 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5279 if (!initialized) {
5280 initialize();
5281 }
5282
5283 if (_RtlCaptureStackBackTrace != NULL) {
5284 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5285 BackTrace, BackTraceHash);
5286 } else {
5287 return 0;
5288 }
5289 }
5290
5291 void os::Kernel32Dll::initializeCommon() {
5292 if (!initialized) {
5293 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5294 assert(handle != NULL, "Just check");
5295 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5296 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5297 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5298 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5299 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5300 initialized = TRUE;
5301 }
5302 }
5303
5304
5305
5306 #ifndef JDK6_OR_EARLIER
5307
5308 void os::Kernel32Dll::initialize() {
5309 initializeCommon();
5310 }
5311
5312
5313 // Kernel32 API
5314 inline BOOL os::Kernel32Dll::SwitchToThread() {
5315 return ::SwitchToThread();
5316 }
5317
5318 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5319 return true;
5320 }
5321
5322 // Help tools
5323 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5324 return true;
5325 }
5326
5327 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5328 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5329 }
5330
5331 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5332 return ::Module32First(hSnapshot, lpme);
5333 }
5334
5335 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5336 return ::Module32Next(hSnapshot, lpme);
5337 }
5338
5339
5340 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5341 return true;
5342 }
5343
5344 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5345 ::GetNativeSystemInfo(lpSystemInfo);
5346 }
5347
5348 // PSAPI API
5349 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5350 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5351 }
5352
5353 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5354 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5355 }
5356
5357 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5358 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5359 }
5360
5361 inline BOOL os::PSApiDll::PSApiAvailable() {
5362 return true;
5363 }
5364
5365
5366 // WinSock2 API
5367 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5368 return ::WSAStartup(wVersionRequested, lpWSAData);
5369 }
5370
5371 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5372 return ::gethostbyname(name);
5373 }
5374
5375 inline BOOL os::WinSock2Dll::WinSock2Available() {
5376 return true;
5377 }
5378
5379 // Advapi API
5380 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5381 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5382 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5383 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5384 BufferLength, PreviousState, ReturnLength);
5385 }
5386
5387 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5388 PHANDLE TokenHandle) {
5389 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5390 }
5391
5392 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5393 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5394 }
5395
5396 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5397 return true;
5398 }
5399
5400 void* os::get_default_process_handle() {
5401 return (void*)GetModuleHandle(NULL);
5402 }
5403
5404 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5405 // which is used to find statically linked in agents.
5406 // Additionally for windows, takes into account __stdcall names.
5407 // Parameters:
5408 // sym_name: Symbol in library we are looking for
5409 // lib_name: Name of library to look in, NULL for shared libs.
5410 // is_absolute_path == true if lib_name is absolute path to agent
5411 // such as "C:/a/b/L.dll"
5412 // == false if only the base name of the library is passed in
5413 // such as "L"
5414 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5415 bool is_absolute_path) {
5416 char *agent_entry_name;
5417 size_t len;
5418 size_t name_len;
5419 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5420 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5421 const char *start;
5422
5423 if (lib_name != NULL) {
5424 len = name_len = strlen(lib_name);
5425 if (is_absolute_path) {
5426 // Need to strip path, prefix and suffix
5427 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5428 lib_name = ++start;
5429 } else {
5430 // Need to check for drive prefix
5431 if ((start = strchr(lib_name, ':')) != NULL) {
5432 lib_name = ++start;
5433 }
5434 }
5435 if (len <= (prefix_len + suffix_len)) {
5436 return NULL;
5437 }
5438 lib_name += prefix_len;
5439 name_len = strlen(lib_name) - suffix_len;
5440 }
5441 }
5442 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5443 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5444 if (agent_entry_name == NULL) {
5445 return NULL;
5446 }
5447 if (lib_name != NULL) {
5448 const char *p = strrchr(sym_name, '@');
5449 if (p != NULL && p != sym_name) {
5450 // sym_name == _Agent_OnLoad@XX
5451 strncpy(agent_entry_name, sym_name, (p - sym_name));
5452 agent_entry_name[(p-sym_name)] = '\0';
5453 // agent_entry_name == _Agent_OnLoad
5454 strcat(agent_entry_name, "_");
5455 strncat(agent_entry_name, lib_name, name_len);
5456 strcat(agent_entry_name, p);
5457 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5458 } else {
5459 strcpy(agent_entry_name, sym_name);
5460 strcat(agent_entry_name, "_");
5461 strncat(agent_entry_name, lib_name, name_len);
5462 }
5463 } else {
5464 strcpy(agent_entry_name, sym_name);
5465 }
5466 return agent_entry_name;
5467 }
5468
5469 #else
5470 // Kernel32 API
5471 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5472 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5473 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5474 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5475 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5476
5477 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5478 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5479 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5480 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5481 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5482
5483 void os::Kernel32Dll::initialize() {
5484 if (!initialized) {
5485 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5486 assert(handle != NULL, "Just check");
5487
5488 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5489 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5490 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5491 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5492 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5493 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5494 initializeCommon(); // resolve the functions that always need resolving
5495
5496 initialized = TRUE;
5497 }
5498 }
5499
5500 BOOL os::Kernel32Dll::SwitchToThread() {
5501 assert(initialized && _SwitchToThread != NULL,
5502 "SwitchToThreadAvailable() not yet called");
5503 return _SwitchToThread();
5504 }
5505
5506
5507 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5508 if (!initialized) {
5509 initialize();
5510 }
5511 return _SwitchToThread != NULL;
5512 }
5513
5514 // Help tools
5515 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5516 if (!initialized) {
5517 initialize();
5518 }
5519 return _CreateToolhelp32Snapshot != NULL &&
5520 _Module32First != NULL &&
5521 _Module32Next != NULL;
5522 }
5523
5524 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5525 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5526 "HelpToolsAvailable() not yet called");
5527
5528 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5529 }
5530
5531 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5532 assert(initialized && _Module32First != NULL,
5533 "HelpToolsAvailable() not yet called");
5534
5535 return _Module32First(hSnapshot, lpme);
5536 }
5537
5538 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5539 assert(initialized && _Module32Next != NULL,
5540 "HelpToolsAvailable() not yet called");
5541
5542 return _Module32Next(hSnapshot, lpme);
5543 }
5544
5545
5546 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5547 if (!initialized) {
5548 initialize();
5549 }
5550 return _GetNativeSystemInfo != NULL;
5551 }
5552
5553 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5554 assert(initialized && _GetNativeSystemInfo != NULL,
5555 "GetNativeSystemInfoAvailable() not yet called");
5556
5557 _GetNativeSystemInfo(lpSystemInfo);
5558 }
5559
5560 // PSAPI API
5561
5562
5563 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5564 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5565 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5566
5567 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5568 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5569 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5570 BOOL os::PSApiDll::initialized = FALSE;
5571
5572 void os::PSApiDll::initialize() {
5573 if (!initialized) {
5574 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5575 if (handle != NULL) {
5576 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5577 "EnumProcessModules");
5578 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5579 "GetModuleFileNameExA");
5580 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5581 "GetModuleInformation");
5582 }
5583 initialized = TRUE;
5584 }
5585 }
5586
5587
5588
5589 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5590 assert(initialized && _EnumProcessModules != NULL,
5591 "PSApiAvailable() not yet called");
5592 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5593 }
5594
5595 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5596 assert(initialized && _GetModuleFileNameEx != NULL,
5597 "PSApiAvailable() not yet called");
5598 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5599 }
5600
5601 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5602 assert(initialized && _GetModuleInformation != NULL,
5603 "PSApiAvailable() not yet called");
5604 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5605 }
5606
5607 BOOL os::PSApiDll::PSApiAvailable() {
5608 if (!initialized) {
5609 initialize();
5610 }
5611 return _EnumProcessModules != NULL &&
5612 _GetModuleFileNameEx != NULL &&
5613 _GetModuleInformation != NULL;
5614 }
5615
5616
5617 // WinSock2 API
5618 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5619 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5620
5621 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5622 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5623 BOOL os::WinSock2Dll::initialized = FALSE;
5624
5625 void os::WinSock2Dll::initialize() {
5626 if (!initialized) {
5627 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5628 if (handle != NULL) {
5629 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5630 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5631 }
5632 initialized = TRUE;
5633 }
5634 }
5635
5636
5637 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5638 assert(initialized && _WSAStartup != NULL,
5639 "WinSock2Available() not yet called");
5640 return _WSAStartup(wVersionRequested, lpWSAData);
5641 }
5642
5643 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5644 assert(initialized && _gethostbyname != NULL,
5645 "WinSock2Available() not yet called");
5646 return _gethostbyname(name);
5647 }
5648
5649 BOOL os::WinSock2Dll::WinSock2Available() {
5650 if (!initialized) {
5651 initialize();
5652 }
5653 return _WSAStartup != NULL &&
5654 _gethostbyname != NULL;
5655 }
5656
5657 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5658 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5659 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5660
5661 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5662 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5663 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5664 BOOL os::Advapi32Dll::initialized = FALSE;
5665
5666 void os::Advapi32Dll::initialize() {
5667 if (!initialized) {
5668 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5669 if (handle != NULL) {
5670 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5671 "AdjustTokenPrivileges");
5672 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5673 "OpenProcessToken");
5674 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5675 "LookupPrivilegeValueA");
5676 }
5677 initialized = TRUE;
5678 }
5679 }
5680
5681 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5682 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5683 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5684 assert(initialized && _AdjustTokenPrivileges != NULL,
5685 "AdvapiAvailable() not yet called");
5686 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5687 BufferLength, PreviousState, ReturnLength);
5688 }
5689
5690 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5691 PHANDLE TokenHandle) {
5692 assert(initialized && _OpenProcessToken != NULL,
5693 "AdvapiAvailable() not yet called");
5694 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5695 }
5696
5697 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5698 assert(initialized && _LookupPrivilegeValue != NULL,
5699 "AdvapiAvailable() not yet called");
5700 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5701 }
5702
5703 BOOL os::Advapi32Dll::AdvapiAvailable() {
5704 if (!initialized) {
5705 initialize();
5706 }
5707 return _AdjustTokenPrivileges != NULL &&
5708 _OpenProcessToken != NULL &&
5709 _LookupPrivilegeValue != NULL;
5710 }
5711
5712 #endif
5713
5714 #ifndef PRODUCT
5715
5716 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5717 // contiguous memory block at a particular address.
5718 // The test first tries to find a good approximate address to allocate at by using the same
5719 // method to allocate some memory at any address. The test then tries to allocate memory in
5720 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5721 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5722 // the previously allocated memory is available for allocation. The only actual failure
5723 // that is reported is when the test tries to allocate at a particular location but gets a
5724 // different valid one. A NULL return value at this point is not considered an error but may
5725 // be legitimate.
5726 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5727 void TestReserveMemorySpecial_test() {
5728 if (!UseLargePages) {
5729 if (VerboseInternalVMTests) {
5730 gclog_or_tty->print("Skipping test because large pages are disabled");
5731 }
5732 return;
5733 }
5734 // save current value of globals
5735 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5736 bool old_use_numa_interleaving = UseNUMAInterleaving;
5737
5738 // set globals to make sure we hit the correct code path
5739 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5740
5741 // do an allocation at an address selected by the OS to get a good one.
5742 const size_t large_allocation_size = os::large_page_size() * 4;
5743 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5744 if (result == NULL) {
5745 if (VerboseInternalVMTests) {
5746 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5747 large_allocation_size);
5748 }
5749 } else {
5750 os::release_memory_special(result, large_allocation_size);
5751
5752 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5753 // we managed to get it once.
5754 const size_t expected_allocation_size = os::large_page_size();
5755 char* expected_location = result + os::large_page_size();
5756 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5757 if (actual_location == NULL) {
5758 if (VerboseInternalVMTests) {
5759 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5760 expected_location, large_allocation_size);
5761 }
5762 } else {
5763 // release memory
5764 os::release_memory_special(actual_location, expected_allocation_size);
5765 // only now check, after releasing any memory to avoid any leaks.
5766 assert(actual_location == expected_location,
5767 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5768 expected_location, expected_allocation_size, actual_location));
5769 }
5770 }
5771
5772 // restore globals
5773 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5774 UseNUMAInterleaving = old_use_numa_interleaving;
5775 }
5776 #endif // PRODUCT
5777