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 "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/memTracker.hpp"
67 #include "services/runtimeService.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/vmError.hpp"
73
74 #ifdef _DEBUG
75 #include <crtdbg.h>
76 #endif
77
78
79 #include <windows.h>
80 #include <sys/types.h>
81 #include <sys/stat.h>
82 #include <sys/timeb.h>
83 #include <objidl.h>
84 #include <shlobj.h>
85
86 #include <malloc.h>
87 #include <signal.h>
88 #include <direct.h>
89 #include <errno.h>
90 #include <fcntl.h>
91 #include <io.h>
92 #include <process.h> // For _beginthreadex(), _endthreadex()
93 #include <imagehlp.h> // For os::dll_address_to_function_name
94 /* for enumerating dll libraries */
95 #include <vdmdbg.h>
96
97 // for timer info max values which include all bits
98 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
99
100 // For DLL loading/load error detection
101 // Values of PE COFF
102 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
103 #define IMAGE_FILE_SIGNATURE_LENGTH 4
104
105 static HANDLE main_process;
106 static HANDLE main_thread;
107 static int main_thread_id;
108
109 static FILETIME process_creation_time;
110 static FILETIME process_exit_time;
111 static FILETIME process_user_time;
112 static FILETIME process_kernel_time;
113
114 #ifdef _M_IA64
115 #define __CPU__ ia64
116 #elif _M_AMD64
117 #define __CPU__ amd64
118 #else
119 #define __CPU__ i486
120 #endif
121
122 // save DLL module handle, used by GetModuleFileName
123
124 HINSTANCE vm_lib_handle;
125
126 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
127 switch (reason) {
128 case DLL_PROCESS_ATTACH:
129 vm_lib_handle = hinst;
130 if (ForceTimeHighResolution)
131 timeBeginPeriod(1L);
132 break;
133 case DLL_PROCESS_DETACH:
134 if (ForceTimeHighResolution)
135 timeEndPeriod(1L);
136
137 // Workaround for issue when a custom launcher doesn't call
138 // DestroyJavaVM and NMT is trying to track memory when free is
139 // called from a static destructor
140 if (MemTracker::is_on()) {
141 MemTracker::shutdown(MemTracker::NMT_normal);
142 }
143 break;
144 default:
145 break;
146 }
147 return true;
148 }
149
150 static inline double fileTimeAsDouble(FILETIME* time) {
151 const double high = (double) ((unsigned int) ~0);
152 const double split = 10000000.0;
153 double result = (time->dwLowDateTime / split) +
154 time->dwHighDateTime * (high/split);
155 return result;
156 }
157
158 // Implementation of os
159
160 bool os::getenv(const char* name, char* buffer, int len) {
161 int result = GetEnvironmentVariable(name, buffer, len);
162 return result > 0 && result < len;
163 }
164
165
166 // No setuid programs under Windows.
167 bool os::have_special_privileges() {
168 return false;
169 }
170
171
172 // This method is a periodic task to check for misbehaving JNI applications
173 // under CheckJNI, we can add any periodic checks here.
174 // For Windows at the moment does nothing
175 void os::run_periodic_checks() {
176 return;
177 }
178
179 // previous UnhandledExceptionFilter, if there is one
180 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181
182 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
183 void os::init_system_properties_values() {
184 /* sysclasspath, java_home, dll_dir */
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH];
191
192 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; /* get rid of \{client|server} */
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL)
202 *pslash = '\0'; /* get rid of \bin */
203 }
204 }
205
206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
207 if (home_path == NULL)
208 return;
209 strcpy(home_path, home_dir);
210 Arguments::set_java_home(home_path);
211
212 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
213 if (dll_path == NULL)
214 return;
215 strcpy(dll_path, home_dir);
216 strcat(dll_path, bin);
217 Arguments::set_dll_dir(dll_path);
218
219 if (!set_boot_path('\\', ';'))
220 return;
221 }
222
223 /* library_path */
224 #define EXT_DIR "\\lib\\ext"
225 #define BIN_DIR "\\bin"
226 #define PACKAGE_DIR "\\Sun\\Java"
227 {
228 /* Win32 library search order (See the documentation for LoadLibrary):
229 *
230 * 1. The directory from which application is loaded.
231 * 2. The system wide Java Extensions directory (Java only)
232 * 3. System directory (GetSystemDirectory)
233 * 4. Windows directory (GetWindowsDirectory)
234 * 5. The PATH environment variable
235 * 6. The current directory
236 */
237
238 char *library_path;
239 char tmp[MAX_PATH];
240 char *path_str = ::getenv("PATH");
241
242 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
243 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
244
245 library_path[0] = '\0';
246
247 GetModuleFileName(NULL, tmp, sizeof(tmp));
248 *(strrchr(tmp, '\\')) = '\0';
249 strcat(library_path, tmp);
250
251 GetWindowsDirectory(tmp, sizeof(tmp));
252 strcat(library_path, ";");
253 strcat(library_path, tmp);
254 strcat(library_path, PACKAGE_DIR BIN_DIR);
255
256 GetSystemDirectory(tmp, sizeof(tmp));
257 strcat(library_path, ";");
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263
264 if (path_str) {
265 strcat(library_path, ";");
266 strcat(library_path, path_str);
267 }
268
269 strcat(library_path, ";.");
270
271 Arguments::set_library_path(library_path);
272 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
273 }
274
275 /* Default extensions directory */
276 {
277 char path[MAX_PATH];
278 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
279 GetWindowsDirectory(path, MAX_PATH);
280 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
281 path, PACKAGE_DIR, EXT_DIR);
282 Arguments::set_ext_dirs(buf);
283 }
284 #undef EXT_DIR
285 #undef BIN_DIR
286 #undef PACKAGE_DIR
287
288 /* Default endorsed standards directory. */
289 {
290 #define ENDORSED_DIR "\\lib\\endorsed"
291 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
292 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
293 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
294 Arguments::set_endorsed_dirs(buf);
295 #undef ENDORSED_DIR
296 }
297
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
302
303 // Done
304 return;
305 }
306
307 void os::breakpoint() {
308 DebugBreak();
309 }
310
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
315
316 /*
317 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 * So far, this method is only used by Native Memory Tracking, which is
319 * only supported on Windows XP or later.
320 */
321 address os::get_caller_pc(int n) {
322 #ifdef _NMT_NOINLINE_
323 n++;
324 #endif
325 address pc;
326 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
327 return pc;
328 }
329 return NULL;
330 }
331
332
333 // os::current_stack_base()
334 //
335 // Returns the base of the stack, which is the stack's
336 // starting address. This function must be called
337 // while running on the stack of the thread being queried.
338
339 address os::current_stack_base() {
340 MEMORY_BASIC_INFORMATION minfo;
341 address stack_bottom;
342 size_t stack_size;
343
344 VirtualQuery(&minfo, &minfo, sizeof(minfo));
345 stack_bottom = (address)minfo.AllocationBase;
346 stack_size = minfo.RegionSize;
347
348 // Add up the sizes of all the regions with the same
349 // AllocationBase.
350 while (1)
351 {
352 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
353 if (stack_bottom == (address)minfo.AllocationBase)
354 stack_size += minfo.RegionSize;
355 else
356 break;
357 }
358
359 #ifdef _M_IA64
360 // IA64 has memory and register stacks
361 //
362 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
363 // at thread creation (1MB backing store growing upwards, 1MB memory stack
364 // growing downwards, 2MB summed up)
365 //
366 // ...
367 // ------- top of stack (high address) -----
368 // |
369 // | 1MB
370 // | Backing Store (Register Stack)
371 // |
372 // | / \
373 // | |
374 // | |
375 // | |
376 // ------------------------ stack base -----
377 // | 1MB
378 // | Memory Stack
379 // |
380 // | |
381 // | |
382 // | |
383 // | \ /
384 // |
385 // ----- bottom of stack (low address) -----
386 // ...
387
388 stack_size = stack_size / 2;
389 #endif
390 return stack_bottom + stack_size;
391 }
392
393 size_t os::current_stack_size() {
394 size_t sz;
395 MEMORY_BASIC_INFORMATION minfo;
396 VirtualQuery(&minfo, &minfo, sizeof(minfo));
397 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
398 return sz;
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
411
412 // Thread start routine for all new Java threads
413 static unsigned __stdcall java_start(Thread* thread) {
414 // Try to randomize the cache line index of hot stack frames.
415 // This helps when threads of the same stack traces evict each other's
416 // cache lines. The threads can be either from the same JVM instance, or
417 // from different JVM instances. The benefit is especially true for
418 // processors with hyperthreading technology.
419 static int counter = 0;
420 int pid = os::current_process_id();
421 _alloca(((pid ^ counter++) & 7) * 128);
422
423 OSThread* osthr = thread->osthread();
424 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
425
426 if (UseNUMA) {
427 int lgrp_id = os::numa_get_group_id();
428 if (lgrp_id != -1) {
429 thread->set_lgrp_id(lgrp_id);
430 }
431 }
432
433
434 // Install a win32 structured exception handler around every thread created
435 // by VM, so VM can genrate error dump when an exception occurred in non-
436 // Java thread (e.g. VM thread).
437 __try {
438 thread->run();
439 } __except(topLevelExceptionFilter(
440 (_EXCEPTION_POINTERS*)_exception_info())) {
441 // Nothing to do.
442 }
443
444 // One less thread is executing
445 // When the VMThread gets here, the main thread may have already exited
446 // which frees the CodeHeap containing the Atomic::add code
447 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
448 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
449 }
450
451 return 0;
452 }
453
454 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
455 // Allocate the OSThread object
456 OSThread* osthread = new OSThread(NULL, NULL);
457 if (osthread == NULL) return NULL;
458
459 // Initialize support for Java interrupts
460 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
461 if (interrupt_event == NULL) {
462 delete osthread;
463 return NULL;
464 }
465 osthread->set_interrupt_event(interrupt_event);
466
467 // Store info on the Win32 thread into the OSThread
468 osthread->set_thread_handle(thread_handle);
469 osthread->set_thread_id(thread_id);
470
471 if (UseNUMA) {
472 int lgrp_id = os::numa_get_group_id();
473 if (lgrp_id != -1) {
474 thread->set_lgrp_id(lgrp_id);
475 }
476 }
477
478 // Initial thread state is INITIALIZED, not SUSPENDED
479 osthread->set_state(INITIALIZED);
480
481 return osthread;
482 }
483
484
485 bool os::create_attached_thread(JavaThread* thread) {
486 #ifdef ASSERT
487 thread->verify_not_published();
488 #endif
489 HANDLE thread_h;
490 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
491 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
492 fatal("DuplicateHandle failed\n");
493 }
494 OSThread* osthread = create_os_thread(thread, thread_h,
495 (int)current_thread_id());
496 if (osthread == NULL) {
497 return false;
498 }
499
500 // Initial thread state is RUNNABLE
501 osthread->set_state(RUNNABLE);
502
503 thread->set_osthread(osthread);
504 return true;
505 }
506
507 bool os::create_main_thread(JavaThread* thread) {
508 #ifdef ASSERT
509 thread->verify_not_published();
510 #endif
511 if (_starting_thread == NULL) {
512 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
513 if (_starting_thread == NULL) {
514 return false;
515 }
516 }
517
518 // The primordial thread is runnable from the start)
519 _starting_thread->set_state(RUNNABLE);
520
521 thread->set_osthread(_starting_thread);
522 return true;
523 }
524
525 // Allocate and initialize a new OSThread
526 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
527 unsigned thread_id;
528
529 // Allocate the OSThread object
530 OSThread* osthread = new OSThread(NULL, NULL);
531 if (osthread == NULL) {
532 return false;
533 }
534
535 // Initialize support for Java interrupts
536 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
537 if (interrupt_event == NULL) {
538 delete osthread;
539 return NULL;
540 }
541 osthread->set_interrupt_event(interrupt_event);
542 osthread->set_interrupted(false);
543
544 thread->set_osthread(osthread);
545
546 if (stack_size == 0) {
547 switch (thr_type) {
548 case os::java_thread:
549 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
550 if (JavaThread::stack_size_at_create() > 0)
551 stack_size = JavaThread::stack_size_at_create();
552 break;
553 case os::compiler_thread:
554 if (CompilerThreadStackSize > 0) {
555 stack_size = (size_t)(CompilerThreadStackSize * K);
556 break;
557 } // else fall through:
558 // use VMThreadStackSize if CompilerThreadStackSize is not defined
559 case os::vm_thread:
560 case os::pgc_thread:
561 case os::cgc_thread:
562 case os::watcher_thread:
563 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
564 break;
565 }
566 }
567
568 // Create the Win32 thread
569 //
570 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
571 // does not specify stack size. Instead, it specifies the size of
572 // initially committed space. The stack size is determined by
573 // PE header in the executable. If the committed "stack_size" is larger
574 // than default value in the PE header, the stack is rounded up to the
575 // nearest multiple of 1MB. For example if the launcher has default
576 // stack size of 320k, specifying any size less than 320k does not
577 // affect the actual stack size at all, it only affects the initial
578 // commitment. On the other hand, specifying 'stack_size' larger than
579 // default value may cause significant increase in memory usage, because
580 // not only the stack space will be rounded up to MB, but also the
581 // entire space is committed upfront.
582 //
583 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
584 // for CreateThread() that can treat 'stack_size' as stack size. However we
585 // are not supposed to call CreateThread() directly according to MSDN
586 // document because JVM uses C runtime library. The good news is that the
587 // flag appears to work with _beginthredex() as well.
588
589 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
590 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
591 #endif
592
593 HANDLE thread_handle =
594 (HANDLE)_beginthreadex(NULL,
595 (unsigned)stack_size,
596 (unsigned (__stdcall *)(void*)) java_start,
597 thread,
598 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
599 &thread_id);
600 if (thread_handle == NULL) {
601 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
602 // without the flag.
603 thread_handle =
604 (HANDLE)_beginthreadex(NULL,
605 (unsigned)stack_size,
606 (unsigned (__stdcall *)(void*)) java_start,
607 thread,
608 CREATE_SUSPENDED,
609 &thread_id);
610 }
611 if (thread_handle == NULL) {
612 // Need to clean up stuff we've allocated so far
613 CloseHandle(osthread->interrupt_event());
614 thread->set_osthread(NULL);
615 delete osthread;
616 return NULL;
617 }
618
619 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
620
621 // Store info on the Win32 thread into the OSThread
622 osthread->set_thread_handle(thread_handle);
623 osthread->set_thread_id(thread_id);
624
625 // Initial thread state is INITIALIZED, not SUSPENDED
626 osthread->set_state(INITIALIZED);
627
628 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
629 return true;
630 }
631
632
633 // Free Win32 resources related to the OSThread
634 void os::free_thread(OSThread* osthread) {
635 assert(osthread != NULL, "osthread not set");
636 CloseHandle(osthread->thread_handle());
637 CloseHandle(osthread->interrupt_event());
638 delete osthread;
639 }
640
641 static jlong first_filetime;
642 static jlong initial_performance_count;
643 static jlong performance_frequency;
644
645
646 jlong as_long(LARGE_INTEGER x) {
647 jlong result = 0; // initialization to avoid warning
648 set_high(&result, x.HighPart);
649 set_low(&result, x.LowPart);
650 return result;
651 }
652
653
654 jlong os::elapsed_counter() {
655 LARGE_INTEGER count;
656 if (win32::_has_performance_count) {
657 QueryPerformanceCounter(&count);
658 return as_long(count) - initial_performance_count;
659 } else {
660 FILETIME wt;
661 GetSystemTimeAsFileTime(&wt);
662 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
663 }
664 }
665
666
667 jlong os::elapsed_frequency() {
668 if (win32::_has_performance_count) {
669 return performance_frequency;
670 } else {
671 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
672 return 10000000;
673 }
674 }
675
676
677 julong os::available_memory() {
678 return win32::available_memory();
679 }
680
681 julong os::win32::available_memory() {
682 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
683 // value if total memory is larger than 4GB
684 MEMORYSTATUSEX ms;
685 ms.dwLength = sizeof(ms);
686 GlobalMemoryStatusEx(&ms);
687
688 return (julong)ms.ullAvailPhys;
689 }
690
691 julong os::physical_memory() {
692 return win32::physical_memory();
693 }
694
695 bool os::has_allocatable_memory_limit(julong* limit) {
696 MEMORYSTATUSEX ms;
697 ms.dwLength = sizeof(ms);
698 GlobalMemoryStatusEx(&ms);
699 #ifdef _LP64
700 *limit = (julong)ms.ullAvailVirtual;
701 return true;
702 #else
703 // Limit to 1400m because of the 2gb address space wall
704 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
705 return true;
706 #endif
707 }
708
709 // VC6 lacks DWORD_PTR
710 #if _MSC_VER < 1300
711 typedef UINT_PTR DWORD_PTR;
712 #endif
713
714 int os::active_processor_count() {
715 DWORD_PTR lpProcessAffinityMask = 0;
716 DWORD_PTR lpSystemAffinityMask = 0;
717 int proc_count = processor_count();
718 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
719 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
720 // Nof active processors is number of bits in process affinity mask
721 int bitcount = 0;
722 while (lpProcessAffinityMask != 0) {
723 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
724 bitcount++;
725 }
726 return bitcount;
727 } else {
728 return proc_count;
729 }
730 }
731
732 void os::set_native_thread_name(const char *name) {
733 // Not yet implemented.
734 return;
735 }
736
737 bool os::distribute_processes(uint length, uint* distribution) {
738 // Not yet implemented.
739 return false;
740 }
741
742 bool os::bind_to_processor(uint processor_id) {
743 // Not yet implemented.
744 return false;
745 }
746
747 void os::win32::initialize_performance_counter() {
748 LARGE_INTEGER count;
749 if (QueryPerformanceFrequency(&count)) {
750 win32::_has_performance_count = 1;
751 performance_frequency = as_long(count);
752 QueryPerformanceCounter(&count);
753 initial_performance_count = as_long(count);
754 } else {
755 win32::_has_performance_count = 0;
756 FILETIME wt;
757 GetSystemTimeAsFileTime(&wt);
758 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
759 }
760 }
761
762
763 double os::elapsedTime() {
764 return (double) elapsed_counter() / (double) elapsed_frequency();
765 }
766
767
768 // Windows format:
769 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
770 // Java format:
771 // Java standards require the number of milliseconds since 1/1/1970
772
773 // Constant offset - calculated using offset()
774 static jlong _offset = 116444736000000000;
775 // Fake time counter for reproducible results when debugging
776 static jlong fake_time = 0;
777
778 #ifdef ASSERT
779 // Just to be safe, recalculate the offset in debug mode
780 static jlong _calculated_offset = 0;
781 static int _has_calculated_offset = 0;
782
783 jlong offset() {
784 if (_has_calculated_offset) return _calculated_offset;
785 SYSTEMTIME java_origin;
786 java_origin.wYear = 1970;
787 java_origin.wMonth = 1;
788 java_origin.wDayOfWeek = 0; // ignored
789 java_origin.wDay = 1;
790 java_origin.wHour = 0;
791 java_origin.wMinute = 0;
792 java_origin.wSecond = 0;
793 java_origin.wMilliseconds = 0;
794 FILETIME jot;
795 if (!SystemTimeToFileTime(&java_origin, &jot)) {
796 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
797 }
798 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
799 _has_calculated_offset = 1;
800 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
801 return _calculated_offset;
802 }
803 #else
804 jlong offset() {
805 return _offset;
806 }
807 #endif
808
809 jlong windows_to_java_time(FILETIME wt) {
810 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
811 return (a - offset()) / 10000;
812 }
813
814 FILETIME java_to_windows_time(jlong l) {
815 jlong a = (l * 10000) + offset();
816 FILETIME result;
817 result.dwHighDateTime = high(a);
818 result.dwLowDateTime = low(a);
819 return result;
820 }
821
822 bool os::supports_vtime() { return true; }
823 bool os::enable_vtime() { return false; }
824 bool os::vtime_enabled() { return false; }
825
826 double os::elapsedVTime() {
827 FILETIME created;
828 FILETIME exited;
829 FILETIME kernel;
830 FILETIME user;
831 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
832 // the resolution of windows_to_java_time() should be sufficient (ms)
833 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
834 } else {
835 return elapsedTime();
836 }
837 }
838
839 jlong os::javaTimeMillis() {
840 if (UseFakeTimers) {
841 return fake_time++;
842 } else {
843 FILETIME wt;
844 GetSystemTimeAsFileTime(&wt);
845 return windows_to_java_time(wt);
846 }
847 }
848
849 jlong os::javaTimeNanos() {
850 if (!win32::_has_performance_count) {
851 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
852 } else {
853 LARGE_INTEGER current_count;
854 QueryPerformanceCounter(¤t_count);
855 double current = as_long(current_count);
856 double freq = performance_frequency;
857 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
858 return time;
859 }
860 }
861
862 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
863 if (!win32::_has_performance_count) {
864 // javaTimeMillis() doesn't have much percision,
865 // but it is not going to wrap -- so all 64 bits
866 info_ptr->max_value = ALL_64_BITS;
867
868 // this is a wall clock timer, so may skip
869 info_ptr->may_skip_backward = true;
870 info_ptr->may_skip_forward = true;
871 } else {
872 jlong freq = performance_frequency;
873 if (freq < NANOSECS_PER_SEC) {
874 // the performance counter is 64 bits and we will
875 // be multiplying it -- so no wrap in 64 bits
876 info_ptr->max_value = ALL_64_BITS;
877 } else if (freq > NANOSECS_PER_SEC) {
878 // use the max value the counter can reach to
879 // determine the max value which could be returned
880 julong max_counter = (julong)ALL_64_BITS;
881 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
882 } else {
883 // the performance counter is 64 bits and we will
884 // be using it directly -- so no wrap in 64 bits
885 info_ptr->max_value = ALL_64_BITS;
886 }
887
888 // using a counter, so no skipping
889 info_ptr->may_skip_backward = false;
890 info_ptr->may_skip_forward = false;
891 }
892 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
893 }
894
895 char* os::local_time_string(char *buf, size_t buflen) {
896 SYSTEMTIME st;
897 GetLocalTime(&st);
898 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
899 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
900 return buf;
901 }
902
903 bool os::getTimesSecs(double* process_real_time,
904 double* process_user_time,
905 double* process_system_time) {
906 HANDLE h_process = GetCurrentProcess();
907 FILETIME create_time, exit_time, kernel_time, user_time;
908 BOOL result = GetProcessTimes(h_process,
909 &create_time,
910 &exit_time,
911 &kernel_time,
912 &user_time);
913 if (result != 0) {
914 FILETIME wt;
915 GetSystemTimeAsFileTime(&wt);
916 jlong rtc_millis = windows_to_java_time(wt);
917 jlong user_millis = windows_to_java_time(user_time);
918 jlong system_millis = windows_to_java_time(kernel_time);
919 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
920 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
921 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
922 return true;
923 } else {
924 return false;
925 }
926 }
927
928 void os::shutdown() {
929
930 // allow PerfMemory to attempt cleanup of any persistent resources
931 perfMemory_exit();
932
933 // flush buffered output, finish log files
934 ostream_abort();
935
936 // Check for abort hook
937 abort_hook_t abort_hook = Arguments::abort_hook();
938 if (abort_hook != NULL) {
939 abort_hook();
940 }
941 }
942
943
944 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
945 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
946
947 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
948 HINSTANCE dbghelp;
949 EXCEPTION_POINTERS ep;
950 MINIDUMP_EXCEPTION_INFORMATION mei;
951 MINIDUMP_EXCEPTION_INFORMATION* pmei;
952
953 HANDLE hProcess = GetCurrentProcess();
954 DWORD processId = GetCurrentProcessId();
955 HANDLE dumpFile;
956 MINIDUMP_TYPE dumpType;
957 static const char* cwd;
958
959 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
960 #ifndef ASSERT
961 // If running on a client version of Windows and user has not explicitly enabled dumping
962 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
963 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
964 return;
965 // If running on a server version of Windows and user has explictly disabled dumping
966 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
967 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
968 return;
969 }
970 #else
971 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
972 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
973 return;
974 }
975 #endif
976
977 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
978
979 if (dbghelp == NULL) {
980 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
981 return;
982 }
983
984 _MiniDumpWriteDump = CAST_TO_FN_PTR(
985 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
986 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
987 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
988
989 if (_MiniDumpWriteDump == NULL) {
990 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
991 return;
992 }
993
994 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
995
996 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
997 // API_VERSION_NUMBER 11 or higher contains the ones we want though
998 #if API_VERSION_NUMBER >= 11
999 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1000 MiniDumpWithUnloadedModules);
1001 #endif
1002
1003 cwd = get_current_directory(NULL, 0);
1004 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp", cwd, current_process_id());
1005 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1006
1007 if (dumpFile == INVALID_HANDLE_VALUE) {
1008 VMError::report_coredump_status("Failed to create file for dumping", false);
1009 return;
1010 }
1011 if (exceptionRecord != NULL && contextRecord != NULL) {
1012 ep.ContextRecord = (PCONTEXT) contextRecord;
1013 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1014
1015 mei.ThreadId = GetCurrentThreadId();
1016 mei.ExceptionPointers = &ep;
1017 pmei = &mei;
1018 } else {
1019 pmei = NULL;
1020 }
1021
1022
1023 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1024 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1025 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1026 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1027 DWORD error = GetLastError();
1028 LPTSTR msgbuf = NULL;
1029
1030 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1031 FORMAT_MESSAGE_FROM_SYSTEM |
1032 FORMAT_MESSAGE_IGNORE_INSERTS,
1033 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1034
1035 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1036 LocalFree(msgbuf);
1037 } else {
1038 // Call to FormatMessage failed, just include the result from GetLastError
1039 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1040 }
1041 VMError::report_coredump_status(buffer, false);
1042 } else {
1043 VMError::report_coredump_status(buffer, true);
1044 }
1045
1046 CloseHandle(dumpFile);
1047 }
1048
1049
1050
1051 void os::abort(bool dump_core)
1052 {
1053 os::shutdown();
1054 // no core dump on Windows
1055 ::exit(1);
1056 }
1057
1058 // Die immediately, no exit hook, no abort hook, no cleanup.
1059 void os::die() {
1060 _exit(-1);
1061 }
1062
1063 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1064 // * dirent_md.c 1.15 00/02/02
1065 //
1066 // The declarations for DIR and struct dirent are in jvm_win32.h.
1067
1068 /* Caller must have already run dirname through JVM_NativePath, which removes
1069 duplicate slashes and converts all instances of '/' into '\\'. */
1070
1071 DIR *
1072 os::opendir(const char *dirname)
1073 {
1074 assert(dirname != NULL, "just checking"); // hotspot change
1075 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1076 DWORD fattr; // hotspot change
1077 char alt_dirname[4] = { 0, 0, 0, 0 };
1078
1079 if (dirp == 0) {
1080 errno = ENOMEM;
1081 return 0;
1082 }
1083
1084 /*
1085 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1086 * as a directory in FindFirstFile(). We detect this case here and
1087 * prepend the current drive name.
1088 */
1089 if (dirname[1] == '\0' && dirname[0] == '\\') {
1090 alt_dirname[0] = _getdrive() + 'A' - 1;
1091 alt_dirname[1] = ':';
1092 alt_dirname[2] = '\\';
1093 alt_dirname[3] = '\0';
1094 dirname = alt_dirname;
1095 }
1096
1097 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1098 if (dirp->path == 0) {
1099 free(dirp, mtInternal);
1100 errno = ENOMEM;
1101 return 0;
1102 }
1103 strcpy(dirp->path, dirname);
1104
1105 fattr = GetFileAttributes(dirp->path);
1106 if (fattr == 0xffffffff) {
1107 free(dirp->path, mtInternal);
1108 free(dirp, mtInternal);
1109 errno = ENOENT;
1110 return 0;
1111 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1112 free(dirp->path, mtInternal);
1113 free(dirp, mtInternal);
1114 errno = ENOTDIR;
1115 return 0;
1116 }
1117
1118 /* Append "*.*", or possibly "\\*.*", to path */
1119 if (dirp->path[1] == ':'
1120 && (dirp->path[2] == '\0'
1121 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1122 /* No '\\' needed for cases like "Z:" or "Z:\" */
1123 strcat(dirp->path, "*.*");
1124 } else {
1125 strcat(dirp->path, "\\*.*");
1126 }
1127
1128 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1129 if (dirp->handle == INVALID_HANDLE_VALUE) {
1130 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1131 free(dirp->path, mtInternal);
1132 free(dirp, mtInternal);
1133 errno = EACCES;
1134 return 0;
1135 }
1136 }
1137 return dirp;
1138 }
1139
1140 /* parameter dbuf unused on Windows */
1141
1142 struct dirent *
1143 os::readdir(DIR *dirp, dirent *dbuf)
1144 {
1145 assert(dirp != NULL, "just checking"); // hotspot change
1146 if (dirp->handle == INVALID_HANDLE_VALUE) {
1147 return 0;
1148 }
1149
1150 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1151
1152 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1153 if (GetLastError() == ERROR_INVALID_HANDLE) {
1154 errno = EBADF;
1155 return 0;
1156 }
1157 FindClose(dirp->handle);
1158 dirp->handle = INVALID_HANDLE_VALUE;
1159 }
1160
1161 return &dirp->dirent;
1162 }
1163
1164 int
1165 os::closedir(DIR *dirp)
1166 {
1167 assert(dirp != NULL, "just checking"); // hotspot change
1168 if (dirp->handle != INVALID_HANDLE_VALUE) {
1169 if (!FindClose(dirp->handle)) {
1170 errno = EBADF;
1171 return -1;
1172 }
1173 dirp->handle = INVALID_HANDLE_VALUE;
1174 }
1175 free(dirp->path, mtInternal);
1176 free(dirp, mtInternal);
1177 return 0;
1178 }
1179
1180 // This must be hard coded because it's the system's temporary
1181 // directory not the java application's temp directory, ala java.io.tmpdir.
1182 const char* os::get_temp_directory() {
1183 static char path_buf[MAX_PATH];
1184 if (GetTempPath(MAX_PATH, path_buf)>0)
1185 return path_buf;
1186 else{
1187 path_buf[0]='\0';
1188 return path_buf;
1189 }
1190 }
1191
1192 static bool file_exists(const char* filename) {
1193 if (filename == NULL || strlen(filename) == 0) {
1194 return false;
1195 }
1196 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1197 }
1198
1199 bool os::dll_build_name(char *buffer, size_t buflen,
1200 const char* pname, const char* fname) {
1201 bool retval = false;
1202 const size_t pnamelen = pname ? strlen(pname) : 0;
1203 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1204
1205 // Return error on buffer overflow.
1206 if (pnamelen + strlen(fname) + 10 > buflen) {
1207 return retval;
1208 }
1209
1210 if (pnamelen == 0) {
1211 jio_snprintf(buffer, buflen, "%s.dll", fname);
1212 retval = true;
1213 } else if (c == ':' || c == '\\') {
1214 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1215 retval = true;
1216 } else if (strchr(pname, *os::path_separator()) != NULL) {
1217 int n;
1218 char** pelements = split_path(pname, &n);
1219 if (pelements == NULL) {
1220 return false;
1221 }
1222 for (int i = 0; i < n; i++) {
1223 char* path = pelements[i];
1224 // Really shouldn't be NULL, but check can't hurt
1225 size_t plen = (path == NULL) ? 0 : strlen(path);
1226 if (plen == 0) {
1227 continue; // skip the empty path values
1228 }
1229 const char lastchar = path[plen - 1];
1230 if (lastchar == ':' || lastchar == '\\') {
1231 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1232 } else {
1233 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1234 }
1235 if (file_exists(buffer)) {
1236 retval = true;
1237 break;
1238 }
1239 }
1240 // release the storage
1241 for (int i = 0; i < n; i++) {
1242 if (pelements[i] != NULL) {
1243 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1244 }
1245 }
1246 if (pelements != NULL) {
1247 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1248 }
1249 } else {
1250 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1251 retval = true;
1252 }
1253 return retval;
1254 }
1255
1256 // Needs to be in os specific directory because windows requires another
1257 // header file <direct.h>
1258 const char* os::get_current_directory(char *buf, size_t buflen) {
1259 int n = static_cast<int>(buflen);
1260 if (buflen > INT_MAX) n = INT_MAX;
1261 return _getcwd(buf, n);
1262 }
1263
1264 //-----------------------------------------------------------
1265 // Helper functions for fatal error handler
1266 #ifdef _WIN64
1267 // Helper routine which returns true if address in
1268 // within the NTDLL address space.
1269 //
1270 static bool _addr_in_ntdll( address addr )
1271 {
1272 HMODULE hmod;
1273 MODULEINFO minfo;
1274
1275 hmod = GetModuleHandle("NTDLL.DLL");
1276 if (hmod == NULL) return false;
1277 if (!os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1278 &minfo, sizeof(MODULEINFO)) )
1279 return false;
1280
1281 if ((addr >= minfo.lpBaseOfDll) &&
1282 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1283 return true;
1284 else
1285 return false;
1286 }
1287 #endif
1288
1289
1290 // Enumerate all modules for a given process ID
1291 //
1292 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1293 // different API for doing this. We use PSAPI.DLL on NT based
1294 // Windows and ToolHelp on 95/98/Me.
1295
1296 // Callback function that is called by enumerate_modules() on
1297 // every DLL module.
1298 // Input parameters:
1299 // int pid,
1300 // char* module_file_name,
1301 // address module_base_addr,
1302 // unsigned module_size,
1303 // void* param
1304 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1305
1306 // enumerate_modules for Windows NT, using PSAPI
1307 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1308 {
1309 HANDLE hProcess;
1310
1311 # define MAX_NUM_MODULES 128
1312 HMODULE modules[MAX_NUM_MODULES];
1313 static char filename[MAX_PATH];
1314 int result = 0;
1315
1316 if (!os::PSApiDll::PSApiAvailable()) {
1317 return 0;
1318 }
1319
1320 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1321 FALSE, pid);
1322 if (hProcess == NULL) return 0;
1323
1324 DWORD size_needed;
1325 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1326 sizeof(modules), &size_needed)) {
1327 CloseHandle(hProcess);
1328 return 0;
1329 }
1330
1331 // number of modules that are currently loaded
1332 int num_modules = size_needed / sizeof(HMODULE);
1333
1334 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1335 // Get Full pathname:
1336 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1337 filename, sizeof(filename))) {
1338 filename[0] = '\0';
1339 }
1340
1341 MODULEINFO modinfo;
1342 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1343 &modinfo, sizeof(modinfo))) {
1344 modinfo.lpBaseOfDll = NULL;
1345 modinfo.SizeOfImage = 0;
1346 }
1347
1348 // Invoke callback function
1349 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1350 modinfo.SizeOfImage, param);
1351 if (result) break;
1352 }
1353
1354 CloseHandle(hProcess);
1355 return result;
1356 }
1357
1358
1359 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1360 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1361 {
1362 HANDLE hSnapShot;
1363 static MODULEENTRY32 modentry;
1364 int result = 0;
1365
1366 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1367 return 0;
1368 }
1369
1370 // Get a handle to a Toolhelp snapshot of the system
1371 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid);
1372 if (hSnapShot == INVALID_HANDLE_VALUE) {
1373 return FALSE;
1374 }
1375
1376 // iterate through all modules
1377 modentry.dwSize = sizeof(MODULEENTRY32);
1378 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1379
1380 while (not_done) {
1381 // invoke the callback
1382 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1383 modentry.modBaseSize, param);
1384 if (result) break;
1385
1386 modentry.dwSize = sizeof(MODULEENTRY32);
1387 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1388 }
1389
1390 CloseHandle(hSnapShot);
1391 return result;
1392 }
1393
1394 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1395 {
1396 // Get current process ID if caller doesn't provide it.
1397 if (!pid) pid = os::current_process_id();
1398
1399 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1400 else return _enumerate_modules_windows(pid, func, param);
1401 }
1402
1403 struct _modinfo {
1404 address addr;
1405 char* full_path; // point to a char buffer
1406 int buflen; // size of the buffer
1407 address base_addr;
1408 };
1409
1410 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1411 unsigned size, void * param) {
1412 struct _modinfo *pmod = (struct _modinfo *)param;
1413 if (!pmod) return -1;
1414
1415 if (base_addr <= pmod->addr &&
1416 base_addr+size > pmod->addr) {
1417 // if a buffer is provided, copy path name to the buffer
1418 if (pmod->full_path) {
1419 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1420 }
1421 pmod->base_addr = base_addr;
1422 return 1;
1423 }
1424 return 0;
1425 }
1426
1427 bool os::dll_address_to_library_name(address addr, char* buf,
1428 int buflen, int* offset) {
1429 // buf is not optional, but offset is optional
1430 assert(buf != NULL, "sanity check");
1431
1432 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1433 // return the full path to the DLL file, sometimes it returns path
1434 // to the corresponding PDB file (debug info); sometimes it only
1435 // returns partial path, which makes life painful.
1436
1437 struct _modinfo mi;
1438 mi.addr = addr;
1439 mi.full_path = buf;
1440 mi.buflen = buflen;
1441 int pid = os::current_process_id();
1442 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1443 // buf already contains path name
1444 if (offset) *offset = addr - mi.base_addr;
1445 return true;
1446 }
1447
1448 buf[0] = '\0';
1449 if (offset) *offset = -1;
1450 return false;
1451 }
1452
1453 bool os::dll_address_to_function_name(address addr, char *buf,
1454 int buflen, int *offset) {
1455 // buf is not optional, but offset is optional
1456 assert(buf != NULL, "sanity check");
1457
1458 if (Decoder::decode(addr, buf, buflen, offset)) {
1459 return true;
1460 }
1461 if (offset != NULL) *offset = -1;
1462 buf[0] = '\0';
1463 return false;
1464 }
1465
1466 // save the start and end address of jvm.dll into param[0] and param[1]
1467 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1468 unsigned size, void * param) {
1469 if (!param) return -1;
1470
1471 if (base_addr <= (address)_locate_jvm_dll &&
1472 base_addr+size > (address)_locate_jvm_dll) {
1473 ((address*)param)[0] = base_addr;
1474 ((address*)param)[1] = base_addr + size;
1475 return 1;
1476 }
1477 return 0;
1478 }
1479
1480 address vm_lib_location[2]; // start and end address of jvm.dll
1481
1482 // check if addr is inside jvm.dll
1483 bool os::address_is_in_vm(address addr) {
1484 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1485 int pid = os::current_process_id();
1486 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1487 assert(false, "Can't find jvm module.");
1488 return false;
1489 }
1490 }
1491
1492 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1493 }
1494
1495 // print module info; param is outputStream*
1496 static int _print_module(int pid, char* fname, address base,
1497 unsigned size, void* param) {
1498 if (!param) return -1;
1499
1500 outputStream* st = (outputStream*)param;
1501
1502 address end_addr = base + size;
1503 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1504 return 0;
1505 }
1506
1507 // Loads .dll/.so and
1508 // in case of error it checks if .dll/.so was built for the
1509 // same architecture as Hotspot is running on
1510 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1511 {
1512 void * result = LoadLibrary(name);
1513 if (result != NULL)
1514 {
1515 return result;
1516 }
1517
1518 DWORD errcode = GetLastError();
1519 if (errcode == ERROR_MOD_NOT_FOUND) {
1520 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1521 ebuf[ebuflen-1]='\0';
1522 return NULL;
1523 }
1524
1525 // Parsing dll below
1526 // If we can read dll-info and find that dll was built
1527 // for an architecture other than Hotspot is running in
1528 // - then print to buffer "DLL was built for a different architecture"
1529 // else call os::lasterror to obtain system error message
1530
1531 // Read system error message into ebuf
1532 // It may or may not be overwritten below (in the for loop and just above)
1533 lasterror(ebuf, (size_t) ebuflen);
1534 ebuf[ebuflen-1]='\0';
1535 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1536 if (file_descriptor<0)
1537 {
1538 return NULL;
1539 }
1540
1541 uint32_t signature_offset;
1542 uint16_t lib_arch=0;
1543 bool failed_to_get_lib_arch=
1544 (
1545 //Go to position 3c in the dll
1546 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1547 ||
1548 // Read loacation of signature
1549 (sizeof(signature_offset)!=
1550 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1551 ||
1552 //Go to COFF File Header in dll
1553 //that is located after"signature" (4 bytes long)
1554 (os::seek_to_file_offset(file_descriptor,
1555 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1556 ||
1557 //Read field that contains code of architecture
1558 // that dll was build for
1559 (sizeof(lib_arch)!=
1560 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1561 );
1562
1563 ::close(file_descriptor);
1564 if (failed_to_get_lib_arch)
1565 {
1566 // file i/o error - report os::lasterror(...) msg
1567 return NULL;
1568 }
1569
1570 typedef struct
1571 {
1572 uint16_t arch_code;
1573 char* arch_name;
1574 } arch_t;
1575
1576 static const arch_t arch_array[]={
1577 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1578 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1579 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1580 };
1581 #if (defined _M_IA64)
1582 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1583 #elif (defined _M_AMD64)
1584 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1585 #elif (defined _M_IX86)
1586 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1587 #else
1588 #error Method os::dll_load requires that one of following \
1589 is defined :_M_IA64,_M_AMD64 or _M_IX86
1590 #endif
1591
1592
1593 // Obtain a string for printf operation
1594 // lib_arch_str shall contain string what platform this .dll was built for
1595 // running_arch_str shall string contain what platform Hotspot was built for
1596 char *running_arch_str=NULL,*lib_arch_str=NULL;
1597 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1598 {
1599 if (lib_arch==arch_array[i].arch_code)
1600 lib_arch_str=arch_array[i].arch_name;
1601 if (running_arch==arch_array[i].arch_code)
1602 running_arch_str=arch_array[i].arch_name;
1603 }
1604
1605 assert(running_arch_str,
1606 "Didn't find runing architecture code in arch_array");
1607
1608 // If the architure is right
1609 // but some other error took place - report os::lasterror(...) msg
1610 if (lib_arch == running_arch)
1611 {
1612 return NULL;
1613 }
1614
1615 if (lib_arch_str!=NULL)
1616 {
1617 ::_snprintf(ebuf, ebuflen-1,
1618 "Can't load %s-bit .dll on a %s-bit platform",
1619 lib_arch_str,running_arch_str);
1620 }
1621 else
1622 {
1623 // don't know what architecture this dll was build for
1624 ::_snprintf(ebuf, ebuflen-1,
1625 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1626 lib_arch,running_arch_str);
1627 }
1628
1629 return NULL;
1630 }
1631
1632
1633 void os::print_dll_info(outputStream *st) {
1634 int pid = os::current_process_id();
1635 st->print_cr("Dynamic libraries:");
1636 enumerate_modules(pid, _print_module, (void *)st);
1637 }
1638
1639 void os::print_os_info_brief(outputStream* st) {
1640 os::print_os_info(st);
1641 }
1642
1643 void os::print_os_info(outputStream* st) {
1644 st->print("OS:");
1645
1646 os::win32::print_windows_version(st);
1647 }
1648
1649 void os::win32::print_windows_version(outputStream* st) {
1650 OSVERSIONINFOEX osvi;
1651 SYSTEM_INFO si;
1652
1653 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1654 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1655
1656 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1657 st->print_cr("N/A");
1658 return;
1659 }
1660
1661 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1662
1663 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1664 if (os_vers >= 5002) {
1665 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1666 // find out whether we are running on 64 bit processor or not.
1667 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) {
1668 os::Kernel32Dll::GetNativeSystemInfo(&si);
1669 } else {
1670 GetSystemInfo(&si);
1671 }
1672 }
1673
1674 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1675 switch (os_vers) {
1676 case 3051: st->print(" Windows NT 3.51"); break;
1677 case 4000: st->print(" Windows NT 4.0"); break;
1678 case 5000: st->print(" Windows 2000"); break;
1679 case 5001: st->print(" Windows XP"); break;
1680 case 5002:
1681 if (osvi.wProductType == VER_NT_WORKSTATION &&
1682 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1683 st->print(" Windows XP x64 Edition");
1684 } else {
1685 st->print(" Windows Server 2003 family");
1686 }
1687 break;
1688
1689 case 6000:
1690 if (osvi.wProductType == VER_NT_WORKSTATION) {
1691 st->print(" Windows Vista");
1692 } else {
1693 st->print(" Windows Server 2008");
1694 }
1695 break;
1696
1697 case 6001:
1698 if (osvi.wProductType == VER_NT_WORKSTATION) {
1699 st->print(" Windows 7");
1700 } else {
1701 st->print(" Windows Server 2008 R2");
1702 }
1703 break;
1704
1705 case 6002:
1706 if (osvi.wProductType == VER_NT_WORKSTATION) {
1707 st->print(" Windows 8");
1708 } else {
1709 st->print(" Windows Server 2012");
1710 }
1711 break;
1712
1713 case 6003:
1714 if (osvi.wProductType == VER_NT_WORKSTATION) {
1715 st->print(" Windows 8.1");
1716 } else {
1717 st->print(" Windows Server 2012 R2");
1718 }
1719 break;
1720
1721 default: // future os
1722 // Unrecognized windows, print out its major and minor versions
1723 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1724 }
1725 } else {
1726 switch (os_vers) {
1727 case 4000: st->print(" Windows 95"); break;
1728 case 4010: st->print(" Windows 98"); break;
1729 case 4090: st->print(" Windows Me"); break;
1730 default: // future windows, print out its major and minor versions
1731 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1732 }
1733 }
1734
1735 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1736 st->print(" , 64 bit");
1737 }
1738
1739 st->print(" Build %d", osvi.dwBuildNumber);
1740 st->print(" %s", osvi.szCSDVersion); // service pack
1741 st->cr();
1742 }
1743
1744 void os::pd_print_cpu_info(outputStream* st) {
1745 // Nothing to do for now.
1746 }
1747
1748 void os::print_memory_info(outputStream* st) {
1749 st->print("Memory:");
1750 st->print(" %dk page", os::vm_page_size()>>10);
1751
1752 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1753 // value if total memory is larger than 4GB
1754 MEMORYSTATUSEX ms;
1755 ms.dwLength = sizeof(ms);
1756 GlobalMemoryStatusEx(&ms);
1757
1758 st->print(", physical %uk", os::physical_memory() >> 10);
1759 st->print("(%uk free)", os::available_memory() >> 10);
1760
1761 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1762 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1763 st->cr();
1764 }
1765
1766 void os::print_siginfo(outputStream *st, void *siginfo) {
1767 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1768 st->print("siginfo:");
1769 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1770
1771 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1772 er->NumberParameters >= 2) {
1773 switch (er->ExceptionInformation[0]) {
1774 case 0: st->print(", reading address"); break;
1775 case 1: st->print(", writing address"); break;
1776 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1777 er->ExceptionInformation[0]);
1778 }
1779 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1780 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1781 er->NumberParameters >= 2 && UseSharedSpaces) {
1782 FileMapInfo* mapinfo = FileMapInfo::current_info();
1783 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1784 st->print("\n\nError accessing class data sharing archive." \
1785 " Mapped file inaccessible during execution, " \
1786 " possible disk/network problem.");
1787 }
1788 } else {
1789 int num = er->NumberParameters;
1790 if (num > 0) {
1791 st->print(", ExceptionInformation=");
1792 for (int i = 0; i < num; i++) {
1793 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1794 }
1795 }
1796 }
1797 st->cr();
1798 }
1799
1800 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1801 // do nothing
1802 }
1803
1804 static char saved_jvm_path[MAX_PATH] = {0};
1805
1806 // Find the full path to the current module, jvm.dll
1807 void os::jvm_path(char *buf, jint buflen) {
1808 // Error checking.
1809 if (buflen < MAX_PATH) {
1810 assert(false, "must use a large-enough buffer");
1811 buf[0] = '\0';
1812 return;
1813 }
1814 // Lazy resolve the path to current module.
1815 if (saved_jvm_path[0] != 0) {
1816 strcpy(buf, saved_jvm_path);
1817 return;
1818 }
1819
1820 buf[0] = '\0';
1821 if (Arguments::sun_java_launcher_is_altjvm()) {
1822 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1823 // for a JAVA_HOME environment variable and fix up the path so it
1824 // looks like jvm.dll is installed there (append a fake suffix
1825 // hotspot/jvm.dll).
1826 char* java_home_var = ::getenv("JAVA_HOME");
1827 if (java_home_var != NULL && java_home_var[0] != 0) {
1828 strncpy(buf, java_home_var, buflen);
1829
1830 // determine if this is a legacy image or modules image
1831 // modules image doesn't have "jre" subdirectory
1832 size_t len = strlen(buf);
1833 char* jrebin_p = buf + len;
1834 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1835 if (0 != _access(buf, 0)) {
1836 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1837 }
1838 len = strlen(buf);
1839 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1840 }
1841 }
1842
1843 if (buf[0] == '\0') {
1844 GetModuleFileName(vm_lib_handle, buf, buflen);
1845 }
1846 strcpy(saved_jvm_path, buf);
1847 }
1848
1849
1850 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1851 #ifndef _WIN64
1852 st->print("_");
1853 #endif
1854 }
1855
1856
1857 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1858 #ifndef _WIN64
1859 st->print("@%d", args_size * sizeof(int));
1860 #endif
1861 }
1862
1863 // This method is a copy of JDK's sysGetLastErrorString
1864 // from src/windows/hpi/src/system_md.c
1865
1866 size_t os::lasterror(char* buf, size_t len) {
1867 DWORD errval;
1868
1869 if ((errval = GetLastError()) != 0) {
1870 // DOS error
1871 size_t n = (size_t)FormatMessage(
1872 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1873 NULL,
1874 errval,
1875 0,
1876 buf,
1877 (DWORD)len,
1878 NULL);
1879 if (n > 3) {
1880 // Drop final '.', CR, LF
1881 if (buf[n - 1] == '\n') n--;
1882 if (buf[n - 1] == '\r') n--;
1883 if (buf[n - 1] == '.') n--;
1884 buf[n] = '\0';
1885 }
1886 return n;
1887 }
1888
1889 if (errno != 0) {
1890 // C runtime error that has no corresponding DOS error code
1891 const char* s = strerror(errno);
1892 size_t n = strlen(s);
1893 if (n >= len) n = len - 1;
1894 strncpy(buf, s, n);
1895 buf[n] = '\0';
1896 return n;
1897 }
1898
1899 return 0;
1900 }
1901
1902 int os::get_last_error() {
1903 DWORD error = GetLastError();
1904 if (error == 0)
1905 error = errno;
1906 return (int)error;
1907 }
1908
1909 // sun.misc.Signal
1910 // NOTE that this is a workaround for an apparent kernel bug where if
1911 // a signal handler for SIGBREAK is installed then that signal handler
1912 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1913 // See bug 4416763.
1914 static void (*sigbreakHandler)(int) = NULL;
1915
1916 static void UserHandler(int sig, void *siginfo, void *context) {
1917 os::signal_notify(sig);
1918 // We need to reinstate the signal handler each time...
1919 os::signal(sig, (void*)UserHandler);
1920 }
1921
1922 void* os::user_handler() {
1923 return (void*) UserHandler;
1924 }
1925
1926 void* os::signal(int signal_number, void* handler) {
1927 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1928 void (*oldHandler)(int) = sigbreakHandler;
1929 sigbreakHandler = (void (*)(int)) handler;
1930 return (void*) oldHandler;
1931 } else {
1932 return (void*)::signal(signal_number, (void (*)(int))handler);
1933 }
1934 }
1935
1936 void os::signal_raise(int signal_number) {
1937 raise(signal_number);
1938 }
1939
1940 // The Win32 C runtime library maps all console control events other than ^C
1941 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1942 // logoff, and shutdown events. We therefore install our own console handler
1943 // that raises SIGTERM for the latter cases.
1944 //
1945 static BOOL WINAPI consoleHandler(DWORD event) {
1946 switch (event) {
1947 case CTRL_C_EVENT:
1948 if (is_error_reported()) {
1949 // Ctrl-C is pressed during error reporting, likely because the error
1950 // handler fails to abort. Let VM die immediately.
1951 os::die();
1952 }
1953
1954 os::signal_raise(SIGINT);
1955 return TRUE;
1956 break;
1957 case CTRL_BREAK_EVENT:
1958 if (sigbreakHandler != NULL) {
1959 (*sigbreakHandler)(SIGBREAK);
1960 }
1961 return TRUE;
1962 break;
1963 case CTRL_LOGOFF_EVENT: {
1964 // Don't terminate JVM if it is running in a non-interactive session,
1965 // such as a service process.
1966 USEROBJECTFLAGS flags;
1967 HANDLE handle = GetProcessWindowStation();
1968 if (handle != NULL &&
1969 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1970 sizeof(USEROBJECTFLAGS), NULL)) {
1971 // If it is a non-interactive session, let next handler to deal
1972 // with it.
1973 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1974 return FALSE;
1975 }
1976 }
1977 }
1978 case CTRL_CLOSE_EVENT:
1979 case CTRL_SHUTDOWN_EVENT:
1980 os::signal_raise(SIGTERM);
1981 return TRUE;
1982 break;
1983 default:
1984 break;
1985 }
1986 return FALSE;
1987 }
1988
1989 /*
1990 * The following code is moved from os.cpp for making this
1991 * code platform specific, which it is by its very nature.
1992 */
1993
1994 // Return maximum OS signal used + 1 for internal use only
1995 // Used as exit signal for signal_thread
1996 int os::sigexitnum_pd() {
1997 return NSIG;
1998 }
1999
2000 // a counter for each possible signal value, including signal_thread exit signal
2001 static volatile jint pending_signals[NSIG+1] = { 0 };
2002 static HANDLE sig_sem = NULL;
2003
2004 void os::signal_init_pd() {
2005 // Initialize signal structures
2006 memset((void*)pending_signals, 0, sizeof(pending_signals));
2007
2008 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2009
2010 // Programs embedding the VM do not want it to attempt to receive
2011 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2012 // shutdown hooks mechanism introduced in 1.3. For example, when
2013 // the VM is run as part of a Windows NT service (i.e., a servlet
2014 // engine in a web server), the correct behavior is for any console
2015 // control handler to return FALSE, not TRUE, because the OS's
2016 // "final" handler for such events allows the process to continue if
2017 // it is a service (while terminating it if it is not a service).
2018 // To make this behavior uniform and the mechanism simpler, we
2019 // completely disable the VM's usage of these console events if -Xrs
2020 // (=ReduceSignalUsage) is specified. This means, for example, that
2021 // the CTRL-BREAK thread dump mechanism is also disabled in this
2022 // case. See bugs 4323062, 4345157, and related bugs.
2023
2024 if (!ReduceSignalUsage) {
2025 // Add a CTRL-C handler
2026 SetConsoleCtrlHandler(consoleHandler, TRUE);
2027 }
2028 }
2029
2030 void os::signal_notify(int signal_number) {
2031 BOOL ret;
2032 if (sig_sem != NULL) {
2033 Atomic::inc(&pending_signals[signal_number]);
2034 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2035 assert(ret != 0, "ReleaseSemaphore() failed");
2036 }
2037 }
2038
2039 static int check_pending_signals(bool wait_for_signal) {
2040 DWORD ret;
2041 while (true) {
2042 for (int i = 0; i < NSIG + 1; i++) {
2043 jint n = pending_signals[i];
2044 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2045 return i;
2046 }
2047 }
2048 if (!wait_for_signal) {
2049 return -1;
2050 }
2051
2052 JavaThread *thread = JavaThread::current();
2053
2054 ThreadBlockInVM tbivm(thread);
2055
2056 bool threadIsSuspended;
2057 do {
2058 thread->set_suspend_equivalent();
2059 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2060 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2061 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2062
2063 // were we externally suspended while we were waiting?
2064 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2065 if (threadIsSuspended) {
2066 //
2067 // The semaphore has been incremented, but while we were waiting
2068 // another thread suspended us. We don't want to continue running
2069 // while suspended because that would surprise the thread that
2070 // suspended us.
2071 //
2072 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2073 assert(ret != 0, "ReleaseSemaphore() failed");
2074
2075 thread->java_suspend_self();
2076 }
2077 } while (threadIsSuspended);
2078 }
2079 }
2080
2081 int os::signal_lookup() {
2082 return check_pending_signals(false);
2083 }
2084
2085 int os::signal_wait() {
2086 return check_pending_signals(true);
2087 }
2088
2089 // Implicit OS exception handling
2090
2091 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2092 JavaThread* thread = JavaThread::current();
2093 // Save pc in thread
2094 #ifdef _M_IA64
2095 // Do not blow up if no thread info available.
2096 if (thread) {
2097 // Saving PRECISE pc (with slot information) in thread.
2098 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2099 // Convert precise PC into "Unix" format
2100 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2101 thread->set_saved_exception_pc((address)precise_pc);
2102 }
2103 // Set pc to handler
2104 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2105 // Clear out psr.ri (= Restart Instruction) in order to continue
2106 // at the beginning of the target bundle.
2107 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2108 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2109 #elif _M_AMD64
2110 // Do not blow up if no thread info available.
2111 if (thread) {
2112 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2113 }
2114 // Set pc to handler
2115 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2116 #else
2117 // Do not blow up if no thread info available.
2118 if (thread) {
2119 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2120 }
2121 // Set pc to handler
2122 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2123 #endif
2124
2125 // Continue the execution
2126 return EXCEPTION_CONTINUE_EXECUTION;
2127 }
2128
2129
2130 // Used for PostMortemDump
2131 extern "C" void safepoints();
2132 extern "C" void find(int x);
2133 extern "C" void events();
2134
2135 // According to Windows API documentation, an illegal instruction sequence should generate
2136 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2137 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2138 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2139
2140 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2141
2142 // From "Execution Protection in the Windows Operating System" draft 0.35
2143 // Once a system header becomes available, the "real" define should be
2144 // included or copied here.
2145 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2146
2147 // Handle NAT Bit consumption on IA64.
2148 #ifdef _M_IA64
2149 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2150 #endif
2151
2152 // Windows Vista/2008 heap corruption check
2153 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2154
2155 #define def_excpt(val) #val, val
2156
2157 struct siglabel {
2158 char *name;
2159 int number;
2160 };
2161
2162 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2163 // C++ compiler contain this error code. Because this is a compiler-generated
2164 // error, the code is not listed in the Win32 API header files.
2165 // The code is actually a cryptic mnemonic device, with the initial "E"
2166 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2167 // ASCII values of "msc".
2168
2169 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2170
2171
2172 struct siglabel exceptlabels[] = {
2173 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2174 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2175 def_excpt(EXCEPTION_BREAKPOINT),
2176 def_excpt(EXCEPTION_SINGLE_STEP),
2177 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2178 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2179 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2180 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2181 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2182 def_excpt(EXCEPTION_FLT_OVERFLOW),
2183 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2184 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2185 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2186 def_excpt(EXCEPTION_INT_OVERFLOW),
2187 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2188 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2189 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2190 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2191 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2192 def_excpt(EXCEPTION_STACK_OVERFLOW),
2193 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2194 def_excpt(EXCEPTION_GUARD_PAGE),
2195 def_excpt(EXCEPTION_INVALID_HANDLE),
2196 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2197 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2198 #ifdef _M_IA64
2199 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2200 #endif
2201 NULL, 0
2202 };
2203
2204 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2205 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2206 if (exceptlabels[i].number == exception_code) {
2207 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2208 return buf;
2209 }
2210 }
2211
2212 return NULL;
2213 }
2214
2215 //-----------------------------------------------------------------------------
2216 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2217 // handle exception caused by idiv; should only happen for -MinInt/-1
2218 // (division by zero is handled explicitly)
2219 #ifdef _M_IA64
2220 assert(0, "Fix Handle_IDiv_Exception");
2221 #elif _M_AMD64
2222 PCONTEXT ctx = exceptionInfo->ContextRecord;
2223 address pc = (address)ctx->Rip;
2224 assert(pc[0] == 0xF7, "not an idiv opcode");
2225 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2226 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2227 // set correct result values and continue after idiv instruction
2228 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2229 ctx->Rax = (DWORD)min_jint; // result
2230 ctx->Rdx = (DWORD)0; // remainder
2231 // Continue the execution
2232 #else
2233 PCONTEXT ctx = exceptionInfo->ContextRecord;
2234 address pc = (address)ctx->Eip;
2235 assert(pc[0] == 0xF7, "not an idiv opcode");
2236 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2237 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2238 // set correct result values and continue after idiv instruction
2239 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2240 ctx->Eax = (DWORD)min_jint; // result
2241 ctx->Edx = (DWORD)0; // remainder
2242 // Continue the execution
2243 #endif
2244 return EXCEPTION_CONTINUE_EXECUTION;
2245 }
2246
2247 //-----------------------------------------------------------------------------
2248 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2249 PCONTEXT ctx = exceptionInfo->ContextRecord;
2250 #ifndef _WIN64
2251 // handle exception caused by native method modifying control word
2252 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2253
2254 switch (exception_code) {
2255 case EXCEPTION_FLT_DENORMAL_OPERAND:
2256 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2257 case EXCEPTION_FLT_INEXACT_RESULT:
2258 case EXCEPTION_FLT_INVALID_OPERATION:
2259 case EXCEPTION_FLT_OVERFLOW:
2260 case EXCEPTION_FLT_STACK_CHECK:
2261 case EXCEPTION_FLT_UNDERFLOW:
2262 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2263 if (fp_control_word != ctx->FloatSave.ControlWord) {
2264 // Restore FPCW and mask out FLT exceptions
2265 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2266 // Mask out pending FLT exceptions
2267 ctx->FloatSave.StatusWord &= 0xffffff00;
2268 return EXCEPTION_CONTINUE_EXECUTION;
2269 }
2270 }
2271
2272 if (prev_uef_handler != NULL) {
2273 // We didn't handle this exception so pass it to the previous
2274 // UnhandledExceptionFilter.
2275 return (prev_uef_handler)(exceptionInfo);
2276 }
2277 #else // !_WIN64
2278 /*
2279 On Windows, the mxcsr control bits are non-volatile across calls
2280 See also CR 6192333
2281 */
2282 jint MxCsr = INITIAL_MXCSR;
2283 // we can't use StubRoutines::addr_mxcsr_std()
2284 // because in Win64 mxcsr is not saved there
2285 if (MxCsr != ctx->MxCsr) {
2286 ctx->MxCsr = MxCsr;
2287 return EXCEPTION_CONTINUE_EXECUTION;
2288 }
2289 #endif // !_WIN64
2290
2291 return EXCEPTION_CONTINUE_SEARCH;
2292 }
2293
2294 // Fatal error reporting is single threaded so we can make this a
2295 // static and preallocated. If it's more than MAX_PATH silently ignore
2296 // it.
2297 static char saved_error_file[MAX_PATH] = {0};
2298
2299 void os::set_error_file(const char *logfile) {
2300 if (strlen(logfile) <= MAX_PATH) {
2301 strncpy(saved_error_file, logfile, MAX_PATH);
2302 }
2303 }
2304
2305 static inline void report_error(Thread* t, DWORD exception_code,
2306 address addr, void* siginfo, void* context) {
2307 VMError err(t, exception_code, addr, siginfo, context);
2308 err.report_and_die();
2309
2310 // If UseOsErrorReporting, this will return here and save the error file
2311 // somewhere where we can find it in the minidump.
2312 }
2313
2314 //-----------------------------------------------------------------------------
2315 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2316 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2317 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2318 #ifdef _M_IA64
2319 // On Itanium, we need the "precise pc", which has the slot number coded
2320 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2321 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2322 // Convert the pc to "Unix format", which has the slot number coded
2323 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2324 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2325 // information is saved in the Unix format.
2326 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2327 #elif _M_AMD64
2328 address pc = (address) exceptionInfo->ContextRecord->Rip;
2329 #else
2330 address pc = (address) exceptionInfo->ContextRecord->Eip;
2331 #endif
2332 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2333
2334 // Handle SafeFetch32 and SafeFetchN exceptions.
2335 if (StubRoutines::is_safefetch_fault(pc)) {
2336 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2337 }
2338
2339 #ifndef _WIN64
2340 // Execution protection violation - win32 running on AMD64 only
2341 // Handled first to avoid misdiagnosis as a "normal" access violation;
2342 // This is safe to do because we have a new/unique ExceptionInformation
2343 // code for this condition.
2344 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2345 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2346 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2347 address addr = (address) exceptionRecord->ExceptionInformation[1];
2348
2349 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2350 int page_size = os::vm_page_size();
2351
2352 // Make sure the pc and the faulting address are sane.
2353 //
2354 // If an instruction spans a page boundary, and the page containing
2355 // the beginning of the instruction is executable but the following
2356 // page is not, the pc and the faulting address might be slightly
2357 // different - we still want to unguard the 2nd page in this case.
2358 //
2359 // 15 bytes seems to be a (very) safe value for max instruction size.
2360 bool pc_is_near_addr =
2361 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2362 bool instr_spans_page_boundary =
2363 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2364 (intptr_t) page_size) > 0);
2365
2366 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2367 static volatile address last_addr =
2368 (address) os::non_memory_address_word();
2369
2370 // In conservative mode, don't unguard unless the address is in the VM
2371 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2372 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2373
2374 // Set memory to RWX and retry
2375 address page_start =
2376 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2377 bool res = os::protect_memory((char*) page_start, page_size,
2378 os::MEM_PROT_RWX);
2379
2380 if (PrintMiscellaneous && Verbose) {
2381 char buf[256];
2382 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2383 "at " INTPTR_FORMAT
2384 ", unguarding " INTPTR_FORMAT ": %s", addr,
2385 page_start, (res ? "success" : strerror(errno)));
2386 tty->print_raw_cr(buf);
2387 }
2388
2389 // Set last_addr so if we fault again at the same address, we don't
2390 // end up in an endless loop.
2391 //
2392 // There are two potential complications here. Two threads trapping
2393 // at the same address at the same time could cause one of the
2394 // threads to think it already unguarded, and abort the VM. Likely
2395 // very rare.
2396 //
2397 // The other race involves two threads alternately trapping at
2398 // different addresses and failing to unguard the page, resulting in
2399 // an endless loop. This condition is probably even more unlikely
2400 // than the first.
2401 //
2402 // Although both cases could be avoided by using locks or thread
2403 // local last_addr, these solutions are unnecessary complication:
2404 // this handler is a best-effort safety net, not a complete solution.
2405 // It is disabled by default and should only be used as a workaround
2406 // in case we missed any no-execute-unsafe VM code.
2407
2408 last_addr = addr;
2409
2410 return EXCEPTION_CONTINUE_EXECUTION;
2411 }
2412 }
2413
2414 // Last unguard failed or not unguarding
2415 tty->print_raw_cr("Execution protection violation");
2416 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2417 exceptionInfo->ContextRecord);
2418 return EXCEPTION_CONTINUE_SEARCH;
2419 }
2420 }
2421 #endif // _WIN64
2422
2423 // Check to see if we caught the safepoint code in the
2424 // process of write protecting the memory serialization page.
2425 // It write enables the page immediately after protecting it
2426 // so just return.
2427 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2428 JavaThread* thread = (JavaThread*) t;
2429 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2430 address addr = (address) exceptionRecord->ExceptionInformation[1];
2431 if (os::is_memory_serialize_page(thread, addr)) {
2432 // Block current thread until the memory serialize page permission restored.
2433 os::block_on_serialize_page_trap();
2434 return EXCEPTION_CONTINUE_EXECUTION;
2435 }
2436 }
2437
2438 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2439 VM_Version::is_cpuinfo_segv_addr(pc)) {
2440 // Verify that OS save/restore AVX registers.
2441 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2442 }
2443
2444 if (t != NULL && t->is_Java_thread()) {
2445 JavaThread* thread = (JavaThread*) t;
2446 bool in_java = thread->thread_state() == _thread_in_Java;
2447
2448 // Handle potential stack overflows up front.
2449 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2450 if (os::uses_stack_guard_pages()) {
2451 #ifdef _M_IA64
2452 // Use guard page for register stack.
2453 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2454 address addr = (address) exceptionRecord->ExceptionInformation[1];
2455 // Check for a register stack overflow on Itanium
2456 if (thread->addr_inside_register_stack_red_zone(addr)) {
2457 // Fatal red zone violation happens if the Java program
2458 // catches a StackOverflow error and does so much processing
2459 // that it runs beyond the unprotected yellow guard zone. As
2460 // a result, we are out of here.
2461 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2462 } else if(thread->addr_inside_register_stack(addr)) {
2463 // Disable the yellow zone which sets the state that
2464 // we've got a stack overflow problem.
2465 if (thread->stack_yellow_zone_enabled()) {
2466 thread->disable_stack_yellow_zone();
2467 }
2468 // Give us some room to process the exception.
2469 thread->disable_register_stack_guard();
2470 // Tracing with +Verbose.
2471 if (Verbose) {
2472 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2473 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2474 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2475 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2476 thread->register_stack_base(),
2477 thread->register_stack_base() + thread->stack_size());
2478 }
2479
2480 // Reguard the permanent register stack red zone just to be sure.
2481 // We saw Windows silently disabling this without telling us.
2482 thread->enable_register_stack_red_zone();
2483
2484 return Handle_Exception(exceptionInfo,
2485 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2486 }
2487 #endif
2488 if (thread->stack_yellow_zone_enabled()) {
2489 // Yellow zone violation. The o/s has unprotected the first yellow
2490 // zone page for us. Note: must call disable_stack_yellow_zone to
2491 // update the enabled status, even if the zone contains only one page.
2492 thread->disable_stack_yellow_zone();
2493 // If not in java code, return and hope for the best.
2494 return in_java ? Handle_Exception(exceptionInfo,
2495 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2496 : EXCEPTION_CONTINUE_EXECUTION;
2497 } else {
2498 // Fatal red zone violation.
2499 thread->disable_stack_red_zone();
2500 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2501 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2502 exceptionInfo->ContextRecord);
2503 return EXCEPTION_CONTINUE_SEARCH;
2504 }
2505 } else if (in_java) {
2506 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2507 // a one-time-only guard page, which it has released to us. The next
2508 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2509 return Handle_Exception(exceptionInfo,
2510 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2511 } else {
2512 // Can only return and hope for the best. Further stack growth will
2513 // result in an ACCESS_VIOLATION.
2514 return EXCEPTION_CONTINUE_EXECUTION;
2515 }
2516 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2517 // Either stack overflow or null pointer exception.
2518 if (in_java) {
2519 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2520 address addr = (address) exceptionRecord->ExceptionInformation[1];
2521 address stack_end = thread->stack_base() - thread->stack_size();
2522 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2523 // Stack overflow.
2524 assert(!os::uses_stack_guard_pages(),
2525 "should be caught by red zone code above.");
2526 return Handle_Exception(exceptionInfo,
2527 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2528 }
2529 //
2530 // Check for safepoint polling and implicit null
2531 // We only expect null pointers in the stubs (vtable)
2532 // the rest are checked explicitly now.
2533 //
2534 CodeBlob* cb = CodeCache::find_blob(pc);
2535 if (cb != NULL) {
2536 if (os::is_poll_address(addr)) {
2537 address stub = SharedRuntime::get_poll_stub(pc);
2538 return Handle_Exception(exceptionInfo, stub);
2539 }
2540 }
2541 {
2542 #ifdef _WIN64
2543 //
2544 // If it's a legal stack address map the entire region in
2545 //
2546 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2547 address addr = (address) exceptionRecord->ExceptionInformation[1];
2548 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2549 addr = (address)((uintptr_t)addr &
2550 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2551 os::commit_memory((char *)addr, thread->stack_base() - addr,
2552 !ExecMem);
2553 return EXCEPTION_CONTINUE_EXECUTION;
2554 }
2555 else
2556 #endif
2557 {
2558 // Null pointer exception.
2559 #ifdef _M_IA64
2560 // Process implicit null checks in compiled code. Note: Implicit null checks
2561 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2562 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2563 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2564 // Handle implicit null check in UEP method entry
2565 if (cb && (cb->is_frame_complete_at(pc) ||
2566 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2567 if (Verbose) {
2568 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2569 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2570 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2571 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2572 *(bundle_start + 1), *bundle_start);
2573 }
2574 return Handle_Exception(exceptionInfo,
2575 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2576 }
2577 }
2578
2579 // Implicit null checks were processed above. Hence, we should not reach
2580 // here in the usual case => die!
2581 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2582 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2583 exceptionInfo->ContextRecord);
2584 return EXCEPTION_CONTINUE_SEARCH;
2585
2586 #else // !IA64
2587
2588 // Windows 98 reports faulting addresses incorrectly
2589 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2590 !os::win32::is_nt()) {
2591 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2592 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2593 }
2594 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2595 exceptionInfo->ContextRecord);
2596 return EXCEPTION_CONTINUE_SEARCH;
2597 #endif
2598 }
2599 }
2600 }
2601
2602 #ifdef _WIN64
2603 // Special care for fast JNI field accessors.
2604 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2605 // in and the heap gets shrunk before the field access.
2606 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2607 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2608 if (addr != (address)-1) {
2609 return Handle_Exception(exceptionInfo, addr);
2610 }
2611 }
2612 #endif
2613
2614 // Stack overflow or null pointer exception in native code.
2615 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2616 exceptionInfo->ContextRecord);
2617 return EXCEPTION_CONTINUE_SEARCH;
2618 } // /EXCEPTION_ACCESS_VIOLATION
2619 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2620 #if defined _M_IA64
2621 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2622 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2623 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2624
2625 // Compiled method patched to be non entrant? Following conditions must apply:
2626 // 1. must be first instruction in bundle
2627 // 2. must be a break instruction with appropriate code
2628 if ((((uint64_t) pc & 0x0F) == 0) &&
2629 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2630 return Handle_Exception(exceptionInfo,
2631 (address)SharedRuntime::get_handle_wrong_method_stub());
2632 }
2633 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2634 #endif
2635
2636
2637 if (in_java) {
2638 switch (exception_code) {
2639 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2640 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2641
2642 case EXCEPTION_INT_OVERFLOW:
2643 return Handle_IDiv_Exception(exceptionInfo);
2644
2645 } // switch
2646 }
2647 if (((thread->thread_state() == _thread_in_Java) ||
2648 (thread->thread_state() == _thread_in_native)) &&
2649 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2650 {
2651 LONG result=Handle_FLT_Exception(exceptionInfo);
2652 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2653 }
2654 }
2655
2656 if (exception_code != EXCEPTION_BREAKPOINT) {
2657 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2658 exceptionInfo->ContextRecord);
2659 }
2660 return EXCEPTION_CONTINUE_SEARCH;
2661 }
2662
2663 #ifndef _WIN64
2664 // Special care for fast JNI accessors.
2665 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2666 // the heap gets shrunk before the field access.
2667 // Need to install our own structured exception handler since native code may
2668 // install its own.
2669 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2670 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2671 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2672 address pc = (address) exceptionInfo->ContextRecord->Eip;
2673 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2674 if (addr != (address)-1) {
2675 return Handle_Exception(exceptionInfo, addr);
2676 }
2677 }
2678 return EXCEPTION_CONTINUE_SEARCH;
2679 }
2680
2681 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2682 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2683 __try { \
2684 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2685 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2686 } \
2687 return 0; \
2688 }
2689
2690 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2691 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2692 DEFINE_FAST_GETFIELD(jchar, char, Char)
2693 DEFINE_FAST_GETFIELD(jshort, short, Short)
2694 DEFINE_FAST_GETFIELD(jint, int, Int)
2695 DEFINE_FAST_GETFIELD(jlong, long, Long)
2696 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2697 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2698
2699 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2700 switch (type) {
2701 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2702 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2703 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2704 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2705 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2706 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2707 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2708 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2709 default: ShouldNotReachHere();
2710 }
2711 return (address)-1;
2712 }
2713 #endif
2714
2715 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2716 // Install a win32 structured exception handler around the test
2717 // function call so the VM can generate an error dump if needed.
2718 __try {
2719 (*funcPtr)();
2720 } __except(topLevelExceptionFilter(
2721 (_EXCEPTION_POINTERS*)_exception_info())) {
2722 // Nothing to do.
2723 }
2724 }
2725
2726 // Virtual Memory
2727
2728 int os::vm_page_size() { return os::win32::vm_page_size(); }
2729 int os::vm_allocation_granularity() {
2730 return os::win32::vm_allocation_granularity();
2731 }
2732
2733 // Windows large page support is available on Windows 2003. In order to use
2734 // large page memory, the administrator must first assign additional privilege
2735 // to the user:
2736 // + select Control Panel -> Administrative Tools -> Local Security Policy
2737 // + select Local Policies -> User Rights Assignment
2738 // + double click "Lock pages in memory", add users and/or groups
2739 // + reboot
2740 // Note the above steps are needed for administrator as well, as administrators
2741 // by default do not have the privilege to lock pages in memory.
2742 //
2743 // Note about Windows 2003: although the API supports committing large page
2744 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2745 // scenario, I found through experiment it only uses large page if the entire
2746 // memory region is reserved and committed in a single VirtualAlloc() call.
2747 // This makes Windows large page support more or less like Solaris ISM, in
2748 // that the entire heap must be committed upfront. This probably will change
2749 // in the future, if so the code below needs to be revisited.
2750
2751 #ifndef MEM_LARGE_PAGES
2752 #define MEM_LARGE_PAGES 0x20000000
2753 #endif
2754
2755 static HANDLE _hProcess;
2756 static HANDLE _hToken;
2757
2758 // Container for NUMA node list info
2759 class NUMANodeListHolder {
2760 private:
2761 int *_numa_used_node_list; // allocated below
2762 int _numa_used_node_count;
2763
2764 void free_node_list() {
2765 if (_numa_used_node_list != NULL) {
2766 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2767 }
2768 }
2769
2770 public:
2771 NUMANodeListHolder() {
2772 _numa_used_node_count = 0;
2773 _numa_used_node_list = NULL;
2774 // do rest of initialization in build routine (after function pointers are set up)
2775 }
2776
2777 ~NUMANodeListHolder() {
2778 free_node_list();
2779 }
2780
2781 bool build() {
2782 DWORD_PTR proc_aff_mask;
2783 DWORD_PTR sys_aff_mask;
2784 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2785 ULONG highest_node_number;
2786 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2787 free_node_list();
2788 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2789 for (unsigned int i = 0; i <= highest_node_number; i++) {
2790 ULONGLONG proc_mask_numa_node;
2791 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2792 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2793 _numa_used_node_list[_numa_used_node_count++] = i;
2794 }
2795 }
2796 return (_numa_used_node_count > 1);
2797 }
2798
2799 int get_count() { return _numa_used_node_count; }
2800 int get_node_list_entry(int n) {
2801 // for indexes out of range, returns -1
2802 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2803 }
2804
2805 } numa_node_list_holder;
2806
2807
2808
2809 static size_t _large_page_size = 0;
2810
2811 static bool resolve_functions_for_large_page_init() {
2812 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2813 os::Advapi32Dll::AdvapiAvailable();
2814 }
2815
2816 static bool request_lock_memory_privilege() {
2817 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2818 os::current_process_id());
2819
2820 LUID luid;
2821 if (_hProcess != NULL &&
2822 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2823 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2824
2825 TOKEN_PRIVILEGES tp;
2826 tp.PrivilegeCount = 1;
2827 tp.Privileges[0].Luid = luid;
2828 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2829
2830 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2831 // privilege. Check GetLastError() too. See MSDN document.
2832 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2833 (GetLastError() == ERROR_SUCCESS)) {
2834 return true;
2835 }
2836 }
2837
2838 return false;
2839 }
2840
2841 static void cleanup_after_large_page_init() {
2842 if (_hProcess) CloseHandle(_hProcess);
2843 _hProcess = NULL;
2844 if (_hToken) CloseHandle(_hToken);
2845 _hToken = NULL;
2846 }
2847
2848 static bool numa_interleaving_init() {
2849 bool success = false;
2850 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2851
2852 // print a warning if UseNUMAInterleaving flag is specified on command line
2853 bool warn_on_failure = use_numa_interleaving_specified;
2854 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2855
2856 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2857 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2858 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2859
2860 if (os::Kernel32Dll::NumaCallsAvailable()) {
2861 if (numa_node_list_holder.build()) {
2862 if (PrintMiscellaneous && Verbose) {
2863 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2864 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2865 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2866 }
2867 tty->print("\n");
2868 }
2869 success = true;
2870 } else {
2871 WARN("Process does not cover multiple NUMA nodes.");
2872 }
2873 } else {
2874 WARN("NUMA Interleaving is not supported by the operating system.");
2875 }
2876 if (!success) {
2877 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2878 }
2879 return success;
2880 #undef WARN
2881 }
2882
2883 // this routine is used whenever we need to reserve a contiguous VA range
2884 // but we need to make separate VirtualAlloc calls for each piece of the range
2885 // Reasons for doing this:
2886 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2887 // * UseNUMAInterleaving requires a separate node for each piece
2888 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2889 bool should_inject_error=false) {
2890 char * p_buf;
2891 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2892 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2893 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2894
2895 // first reserve enough address space in advance since we want to be
2896 // able to break a single contiguous virtual address range into multiple
2897 // large page commits but WS2003 does not allow reserving large page space
2898 // so we just use 4K pages for reserve, this gives us a legal contiguous
2899 // address space. then we will deallocate that reservation, and re alloc
2900 // using large pages
2901 const size_t size_of_reserve = bytes + chunk_size;
2902 if (bytes > size_of_reserve) {
2903 // Overflowed.
2904 return NULL;
2905 }
2906 p_buf = (char *) VirtualAlloc(addr,
2907 size_of_reserve, // size of Reserve
2908 MEM_RESERVE,
2909 PAGE_READWRITE);
2910 // If reservation failed, return NULL
2911 if (p_buf == NULL) return NULL;
2912 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
2913 os::release_memory(p_buf, bytes + chunk_size);
2914
2915 // we still need to round up to a page boundary (in case we are using large pages)
2916 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2917 // instead we handle this in the bytes_to_rq computation below
2918 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2919
2920 // now go through and allocate one chunk at a time until all bytes are
2921 // allocated
2922 size_t bytes_remaining = bytes;
2923 // An overflow of align_size_up() would have been caught above
2924 // in the calculation of size_of_reserve.
2925 char * next_alloc_addr = p_buf;
2926 HANDLE hProc = GetCurrentProcess();
2927
2928 #ifdef ASSERT
2929 // Variable for the failure injection
2930 long ran_num = os::random();
2931 size_t fail_after = ran_num % bytes;
2932 #endif
2933
2934 int count=0;
2935 while (bytes_remaining) {
2936 // select bytes_to_rq to get to the next chunk_size boundary
2937
2938 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2939 // Note allocate and commit
2940 char * p_new;
2941
2942 #ifdef ASSERT
2943 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2944 #else
2945 const bool inject_error_now = false;
2946 #endif
2947
2948 if (inject_error_now) {
2949 p_new = NULL;
2950 } else {
2951 if (!UseNUMAInterleaving) {
2952 p_new = (char *) VirtualAlloc(next_alloc_addr,
2953 bytes_to_rq,
2954 flags,
2955 prot);
2956 } else {
2957 // get the next node to use from the used_node_list
2958 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2959 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2960 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2961 next_alloc_addr,
2962 bytes_to_rq,
2963 flags,
2964 prot,
2965 node);
2966 }
2967 }
2968
2969 if (p_new == NULL) {
2970 // Free any allocated pages
2971 if (next_alloc_addr > p_buf) {
2972 // Some memory was committed so release it.
2973 size_t bytes_to_release = bytes - bytes_remaining;
2974 // NMT has yet to record any individual blocks, so it
2975 // need to create a dummy 'reserve' record to match
2976 // the release.
2977 MemTracker::record_virtual_memory_reserve((address)p_buf,
2978 bytes_to_release, mtNone, CALLER_PC);
2979 os::release_memory(p_buf, bytes_to_release);
2980 }
2981 #ifdef ASSERT
2982 if (should_inject_error) {
2983 if (TracePageSizes && Verbose) {
2984 tty->print_cr("Reserving pages individually failed.");
2985 }
2986 }
2987 #endif
2988 return NULL;
2989 }
2990
2991 bytes_remaining -= bytes_to_rq;
2992 next_alloc_addr += bytes_to_rq;
2993 count++;
2994 }
2995 // Although the memory is allocated individually, it is returned as one.
2996 // NMT records it as one block.
2997 address pc = CALLER_PC;
2998 if ((flags & MEM_COMMIT) != 0) {
2999 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
3000 } else {
3001 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
3002 }
3003
3004 // made it this far, success
3005 return p_buf;
3006 }
3007
3008
3009
3010 void os::large_page_init() {
3011 if (!UseLargePages) return;
3012
3013 // print a warning if any large page related flag is specified on command line
3014 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3015 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3016 bool success = false;
3017
3018 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3019 if (resolve_functions_for_large_page_init()) {
3020 if (request_lock_memory_privilege()) {
3021 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3022 if (s) {
3023 #if defined(IA32) || defined(AMD64)
3024 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3025 WARN("JVM cannot use large pages bigger than 4mb.");
3026 } else {
3027 #endif
3028 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3029 _large_page_size = LargePageSizeInBytes;
3030 } else {
3031 _large_page_size = s;
3032 }
3033 success = true;
3034 #if defined(IA32) || defined(AMD64)
3035 }
3036 #endif
3037 } else {
3038 WARN("Large page is not supported by the processor.");
3039 }
3040 } else {
3041 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3042 }
3043 } else {
3044 WARN("Large page is not supported by the operating system.");
3045 }
3046 #undef WARN
3047
3048 const size_t default_page_size = (size_t) vm_page_size();
3049 if (success && _large_page_size > default_page_size) {
3050 _page_sizes[0] = _large_page_size;
3051 _page_sizes[1] = default_page_size;
3052 _page_sizes[2] = 0;
3053 }
3054
3055 cleanup_after_large_page_init();
3056 UseLargePages = success;
3057 }
3058
3059 // On win32, one cannot release just a part of reserved memory, it's an
3060 // all or nothing deal. When we split a reservation, we must break the
3061 // reservation into two reservations.
3062 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3063 bool realloc) {
3064 if (size > 0) {
3065 release_memory(base, size);
3066 if (realloc) {
3067 reserve_memory(split, base);
3068 }
3069 if (size != split) {
3070 reserve_memory(size - split, base + split);
3071 }
3072 }
3073 }
3074
3075 // Multiple threads can race in this code but it's not possible to unmap small sections of
3076 // virtual space to get requested alignment, like posix-like os's.
3077 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3078 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3079 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3080 "Alignment must be a multiple of allocation granularity (page size)");
3081 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3082
3083 size_t extra_size = size + alignment;
3084 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3085
3086 char* aligned_base = NULL;
3087
3088 do {
3089 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3090 if (extra_base == NULL) {
3091 return NULL;
3092 }
3093 // Do manual alignment
3094 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3095
3096 os::release_memory(extra_base, extra_size);
3097
3098 aligned_base = os::reserve_memory(size, aligned_base);
3099
3100 } while (aligned_base == NULL);
3101
3102 return aligned_base;
3103 }
3104
3105 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3106 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3107 "reserve alignment");
3108 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3109 char* res;
3110 // note that if UseLargePages is on, all the areas that require interleaving
3111 // will go thru reserve_memory_special rather than thru here.
3112 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3113 if (!use_individual) {
3114 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3115 } else {
3116 elapsedTimer reserveTimer;
3117 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3118 // in numa interleaving, we have to allocate pages individually
3119 // (well really chunks of NUMAInterleaveGranularity size)
3120 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3121 if (res == NULL) {
3122 warning("NUMA page allocation failed");
3123 }
3124 if (Verbose && PrintMiscellaneous) {
3125 reserveTimer.stop();
3126 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3127 reserveTimer.milliseconds(), reserveTimer.ticks());
3128 }
3129 }
3130 assert(res == NULL || addr == NULL || addr == res,
3131 "Unexpected address from reserve.");
3132
3133 return res;
3134 }
3135
3136 // Reserve memory at an arbitrary address, only if that area is
3137 // available (and not reserved for something else).
3138 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3139 // Windows os::reserve_memory() fails of the requested address range is
3140 // not avilable.
3141 return reserve_memory(bytes, requested_addr);
3142 }
3143
3144 size_t os::large_page_size() {
3145 return _large_page_size;
3146 }
3147
3148 bool os::can_commit_large_page_memory() {
3149 // Windows only uses large page memory when the entire region is reserved
3150 // and committed in a single VirtualAlloc() call. This may change in the
3151 // future, but with Windows 2003 it's not possible to commit on demand.
3152 return false;
3153 }
3154
3155 bool os::can_execute_large_page_memory() {
3156 return true;
3157 }
3158
3159 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3160 assert(UseLargePages, "only for large pages");
3161
3162 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3163 return NULL; // Fallback to small pages.
3164 }
3165
3166 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3167 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3168
3169 // with large pages, there are two cases where we need to use Individual Allocation
3170 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3171 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3172 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3173 if (TracePageSizes && Verbose) {
3174 tty->print_cr("Reserving large pages individually.");
3175 }
3176 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3177 if (p_buf == NULL) {
3178 // give an appropriate warning message
3179 if (UseNUMAInterleaving) {
3180 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3181 }
3182 if (UseLargePagesIndividualAllocation) {
3183 warning("Individually allocated large pages failed, "
3184 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3185 }
3186 return NULL;
3187 }
3188
3189 return p_buf;
3190
3191 } else {
3192 if (TracePageSizes && Verbose) {
3193 tty->print_cr("Reserving large pages in a single large chunk.");
3194 }
3195 // normal policy just allocate it all at once
3196 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3197 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3198 if (res != NULL) {
3199 address pc = CALLER_PC;
3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
3201 }
3202
3203 return res;
3204 }
3205 }
3206
3207 bool os::release_memory_special(char* base, size_t bytes) {
3208 assert(base != NULL, "Sanity check");
3209 return release_memory(base, bytes);
3210 }
3211
3212 void os::print_statistics() {
3213 }
3214
3215 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3216 int err = os::get_last_error();
3217 char buf[256];
3218 size_t buf_len = os::lasterror(buf, sizeof(buf));
3219 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3220 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3221 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3222 }
3223
3224 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3225 if (bytes == 0) {
3226 // Don't bother the OS with noops.
3227 return true;
3228 }
3229 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3230 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3231 // Don't attempt to print anything if the OS call fails. We're
3232 // probably low on resources, so the print itself may cause crashes.
3233
3234 // unless we have NUMAInterleaving enabled, the range of a commit
3235 // is always within a reserve covered by a single VirtualAlloc
3236 // in that case we can just do a single commit for the requested size
3237 if (!UseNUMAInterleaving) {
3238 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3239 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3240 return false;
3241 }
3242 if (exec) {
3243 DWORD oldprot;
3244 // Windows doc says to use VirtualProtect to get execute permissions
3245 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3246 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3247 return false;
3248 }
3249 }
3250 return true;
3251 } else {
3252
3253 // when NUMAInterleaving is enabled, the commit might cover a range that
3254 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3255 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3256 // returns represents the number of bytes that can be committed in one step.
3257 size_t bytes_remaining = bytes;
3258 char * next_alloc_addr = addr;
3259 while (bytes_remaining > 0) {
3260 MEMORY_BASIC_INFORMATION alloc_info;
3261 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3262 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3263 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3264 PAGE_READWRITE) == NULL) {
3265 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3266 exec);)
3267 return false;
3268 }
3269 if (exec) {
3270 DWORD oldprot;
3271 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3272 PAGE_EXECUTE_READWRITE, &oldprot)) {
3273 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3274 exec);)
3275 return false;
3276 }
3277 }
3278 bytes_remaining -= bytes_to_rq;
3279 next_alloc_addr += bytes_to_rq;
3280 }
3281 }
3282 // if we made it this far, return true
3283 return true;
3284 }
3285
3286 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3287 bool exec) {
3288 // alignment_hint is ignored on this OS
3289 return pd_commit_memory(addr, size, exec);
3290 }
3291
3292 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3293 const char* mesg) {
3294 assert(mesg != NULL, "mesg must be specified");
3295 if (!pd_commit_memory(addr, size, exec)) {
3296 warn_fail_commit_memory(addr, size, exec);
3297 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3298 }
3299 }
3300
3301 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3302 size_t alignment_hint, bool exec,
3303 const char* mesg) {
3304 // alignment_hint is ignored on this OS
3305 pd_commit_memory_or_exit(addr, size, exec, mesg);
3306 }
3307
3308 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3309 if (bytes == 0) {
3310 // Don't bother the OS with noops.
3311 return true;
3312 }
3313 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3314 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3315 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3316 }
3317
3318 bool os::pd_release_memory(char* addr, size_t bytes) {
3319 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3320 }
3321
3322 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3323 return os::commit_memory(addr, size, !ExecMem);
3324 }
3325
3326 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3327 return os::uncommit_memory(addr, size);
3328 }
3329
3330 // Set protections specified
3331 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3332 bool is_committed) {
3333 unsigned int p = 0;
3334 switch (prot) {
3335 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3336 case MEM_PROT_READ: p = PAGE_READONLY; break;
3337 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3338 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3339 default:
3340 ShouldNotReachHere();
3341 }
3342
3343 DWORD old_status;
3344
3345 // Strange enough, but on Win32 one can change protection only for committed
3346 // memory, not a big deal anyway, as bytes less or equal than 64K
3347 if (!is_committed) {
3348 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3349 "cannot commit protection page");
3350 }
3351 // One cannot use os::guard_memory() here, as on Win32 guard page
3352 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3353 //
3354 // Pages in the region become guard pages. Any attempt to access a guard page
3355 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3356 // the guard page status. Guard pages thus act as a one-time access alarm.
3357 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3358 }
3359
3360 bool os::guard_memory(char* addr, size_t bytes) {
3361 DWORD old_status;
3362 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3363 }
3364
3365 bool os::unguard_memory(char* addr, size_t bytes) {
3366 DWORD old_status;
3367 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3368 }
3369
3370 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3371 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3372 void os::numa_make_global(char *addr, size_t bytes) { }
3373 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3374 bool os::numa_topology_changed() { return false; }
3375 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3376 int os::numa_get_group_id() { return 0; }
3377 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3378 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3379 // Provide an answer for UMA systems
3380 ids[0] = 0;
3381 return 1;
3382 } else {
3383 // check for size bigger than actual groups_num
3384 size = MIN2(size, numa_get_groups_num());
3385 for (int i = 0; i < (int)size; i++) {
3386 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3387 }
3388 return size;
3389 }
3390 }
3391
3392 bool os::get_page_info(char *start, page_info* info) {
3393 return false;
3394 }
3395
3396 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3397 return end;
3398 }
3399
3400 char* os::non_memory_address_word() {
3401 // Must never look like an address returned by reserve_memory,
3402 // even in its subfields (as defined by the CPU immediate fields,
3403 // if the CPU splits constants across multiple instructions).
3404 return (char*)-1;
3405 }
3406
3407 #define MAX_ERROR_COUNT 100
3408 #define SYS_THREAD_ERROR 0xffffffffUL
3409
3410 void os::pd_start_thread(Thread* thread) {
3411 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3412 // Returns previous suspend state:
3413 // 0: Thread was not suspended
3414 // 1: Thread is running now
3415 // >1: Thread is still suspended.
3416 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3417 }
3418
3419 class HighResolutionInterval : public CHeapObj<mtThread> {
3420 // The default timer resolution seems to be 10 milliseconds.
3421 // (Where is this written down?)
3422 // If someone wants to sleep for only a fraction of the default,
3423 // then we set the timer resolution down to 1 millisecond for
3424 // the duration of their interval.
3425 // We carefully set the resolution back, since otherwise we
3426 // seem to incur an overhead (3%?) that we don't need.
3427 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3428 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3429 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3430 // timeBeginPeriod() if the relative error exceeded some threshold.
3431 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3432 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3433 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3434 // resolution timers running.
3435 private:
3436 jlong resolution;
3437 public:
3438 HighResolutionInterval(jlong ms) {
3439 resolution = ms % 10L;
3440 if (resolution != 0) {
3441 MMRESULT result = timeBeginPeriod(1L);
3442 }
3443 }
3444 ~HighResolutionInterval() {
3445 if (resolution != 0) {
3446 MMRESULT result = timeEndPeriod(1L);
3447 }
3448 resolution = 0L;
3449 }
3450 };
3451
3452 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3453 jlong limit = (jlong) MAXDWORD;
3454
3455 while (ms > limit) {
3456 int res;
3457 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3458 return res;
3459 ms -= limit;
3460 }
3461
3462 assert(thread == Thread::current(), "thread consistency check");
3463 OSThread* osthread = thread->osthread();
3464 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3465 int result;
3466 if (interruptable) {
3467 assert(thread->is_Java_thread(), "must be java thread");
3468 JavaThread *jt = (JavaThread *) thread;
3469 ThreadBlockInVM tbivm(jt);
3470
3471 jt->set_suspend_equivalent();
3472 // cleared by handle_special_suspend_equivalent_condition() or
3473 // java_suspend_self() via check_and_wait_while_suspended()
3474
3475 HANDLE events[1];
3476 events[0] = osthread->interrupt_event();
3477 HighResolutionInterval *phri=NULL;
3478 if (!ForceTimeHighResolution)
3479 phri = new HighResolutionInterval(ms);
3480 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3481 result = OS_TIMEOUT;
3482 } else {
3483 ResetEvent(osthread->interrupt_event());
3484 osthread->set_interrupted(false);
3485 result = OS_INTRPT;
3486 }
3487 delete phri; //if it is NULL, harmless
3488
3489 // were we externally suspended while we were waiting?
3490 jt->check_and_wait_while_suspended();
3491 } else {
3492 assert(!thread->is_Java_thread(), "must not be java thread");
3493 Sleep((long) ms);
3494 result = OS_TIMEOUT;
3495 }
3496 return result;
3497 }
3498
3499 //
3500 // Short sleep, direct OS call.
3501 //
3502 // ms = 0, means allow others (if any) to run.
3503 //
3504 void os::naked_short_sleep(jlong ms) {
3505 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3506 Sleep(ms);
3507 }
3508
3509 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3510 void os::infinite_sleep() {
3511 while (true) { // sleep forever ...
3512 Sleep(100000); // ... 100 seconds at a time
3513 }
3514 }
3515
3516 typedef BOOL (WINAPI * STTSignature)(void);
3517
3518 os::YieldResult os::NakedYield() {
3519 // Use either SwitchToThread() or Sleep(0)
3520 // Consider passing back the return value from SwitchToThread().
3521 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3522 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY;
3523 } else {
3524 Sleep(0);
3525 }
3526 return os::YIELD_UNKNOWN;
3527 }
3528
3529 void os::yield() { os::NakedYield(); }
3530
3531 void os::yield_all() {
3532 // Yields to all threads, including threads with lower priorities
3533 Sleep(1);
3534 }
3535
3536 // Win32 only gives you access to seven real priorities at a time,
3537 // so we compress Java's ten down to seven. It would be better
3538 // if we dynamically adjusted relative priorities.
3539
3540 int os::java_to_os_priority[CriticalPriority + 1] = {
3541 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3542 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3543 THREAD_PRIORITY_LOWEST, // 2
3544 THREAD_PRIORITY_BELOW_NORMAL, // 3
3545 THREAD_PRIORITY_BELOW_NORMAL, // 4
3546 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3547 THREAD_PRIORITY_NORMAL, // 6
3548 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3549 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3550 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3551 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3552 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3553 };
3554
3555 int prio_policy1[CriticalPriority + 1] = {
3556 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3557 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3558 THREAD_PRIORITY_LOWEST, // 2
3559 THREAD_PRIORITY_BELOW_NORMAL, // 3
3560 THREAD_PRIORITY_BELOW_NORMAL, // 4
3561 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3562 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3563 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3564 THREAD_PRIORITY_HIGHEST, // 8
3565 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3566 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3567 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3568 };
3569
3570 static int prio_init() {
3571 // If ThreadPriorityPolicy is 1, switch tables
3572 if (ThreadPriorityPolicy == 1) {
3573 int i;
3574 for (i = 0; i < CriticalPriority + 1; i++) {
3575 os::java_to_os_priority[i] = prio_policy1[i];
3576 }
3577 }
3578 if (UseCriticalJavaThreadPriority) {
3579 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3580 }
3581 return 0;
3582 }
3583
3584 OSReturn os::set_native_priority(Thread* thread, int priority) {
3585 if (!UseThreadPriorities) return OS_OK;
3586 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3587 return ret ? OS_OK : OS_ERR;
3588 }
3589
3590 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3591 if (!UseThreadPriorities) {
3592 *priority_ptr = java_to_os_priority[NormPriority];
3593 return OS_OK;
3594 }
3595 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3596 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3597 assert(false, "GetThreadPriority failed");
3598 return OS_ERR;
3599 }
3600 *priority_ptr = os_prio;
3601 return OS_OK;
3602 }
3603
3604
3605 // Hint to the underlying OS that a task switch would not be good.
3606 // Void return because it's a hint and can fail.
3607 void os::hint_no_preempt() {}
3608
3609 void os::interrupt(Thread* thread) {
3610 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3611 "possibility of dangling Thread pointer");
3612
3613 OSThread* osthread = thread->osthread();
3614 osthread->set_interrupted(true);
3615 // More than one thread can get here with the same value of osthread,
3616 // resulting in multiple notifications. We do, however, want the store
3617 // to interrupted() to be visible to other threads before we post
3618 // the interrupt event.
3619 OrderAccess::release();
3620 SetEvent(osthread->interrupt_event());
3621 // For JSR166: unpark after setting status
3622 if (thread->is_Java_thread())
3623 ((JavaThread*)thread)->parker()->unpark();
3624
3625 ParkEvent * ev = thread->_ParkEvent;
3626 if (ev != NULL) ev->unpark();
3627
3628 }
3629
3630
3631 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3632 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3633 "possibility of dangling Thread pointer");
3634
3635 OSThread* osthread = thread->osthread();
3636 // There is no synchronization between the setting of the interrupt
3637 // and it being cleared here. It is critical - see 6535709 - that
3638 // we only clear the interrupt state, and reset the interrupt event,
3639 // if we are going to report that we were indeed interrupted - else
3640 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3641 // depending on the timing. By checking thread interrupt event to see
3642 // if the thread gets real interrupt thus prevent spurious wakeup.
3643 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3644 if (interrupted && clear_interrupted) {
3645 osthread->set_interrupted(false);
3646 ResetEvent(osthread->interrupt_event());
3647 } // Otherwise leave the interrupted state alone
3648
3649 return interrupted;
3650 }
3651
3652 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3653 ExtendedPC os::get_thread_pc(Thread* thread) {
3654 CONTEXT context;
3655 context.ContextFlags = CONTEXT_CONTROL;
3656 HANDLE handle = thread->osthread()->thread_handle();
3657 #ifdef _M_IA64
3658 assert(0, "Fix get_thread_pc");
3659 return ExtendedPC(NULL);
3660 #else
3661 if (GetThreadContext(handle, &context)) {
3662 #ifdef _M_AMD64
3663 return ExtendedPC((address) context.Rip);
3664 #else
3665 return ExtendedPC((address) context.Eip);
3666 #endif
3667 } else {
3668 return ExtendedPC(NULL);
3669 }
3670 #endif
3671 }
3672
3673 // GetCurrentThreadId() returns DWORD
3674 intx os::current_thread_id() { return GetCurrentThreadId(); }
3675
3676 static int _initial_pid = 0;
3677
3678 int os::current_process_id()
3679 {
3680 return (_initial_pid ? _initial_pid : _getpid());
3681 }
3682
3683 int os::win32::_vm_page_size = 0;
3684 int os::win32::_vm_allocation_granularity = 0;
3685 int os::win32::_processor_type = 0;
3686 // Processor level is not available on non-NT systems, use vm_version instead
3687 int os::win32::_processor_level = 0;
3688 julong os::win32::_physical_memory = 0;
3689 size_t os::win32::_default_stack_size = 0;
3690
3691 intx os::win32::_os_thread_limit = 0;
3692 volatile intx os::win32::_os_thread_count = 0;
3693
3694 bool os::win32::_is_nt = false;
3695 bool os::win32::_is_windows_2003 = false;
3696 bool os::win32::_is_windows_server = false;
3697
3698 bool os::win32::_has_performance_count = 0;
3699
3700 void os::win32::initialize_system_info() {
3701 SYSTEM_INFO si;
3702 GetSystemInfo(&si);
3703 _vm_page_size = si.dwPageSize;
3704 _vm_allocation_granularity = si.dwAllocationGranularity;
3705 _processor_type = si.dwProcessorType;
3706 _processor_level = si.wProcessorLevel;
3707 set_processor_count(si.dwNumberOfProcessors);
3708
3709 MEMORYSTATUSEX ms;
3710 ms.dwLength = sizeof(ms);
3711
3712 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3713 // dwMemoryLoad (% of memory in use)
3714 GlobalMemoryStatusEx(&ms);
3715 _physical_memory = ms.ullTotalPhys;
3716
3717 OSVERSIONINFOEX oi;
3718 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3719 GetVersionEx((OSVERSIONINFO*)&oi);
3720 switch (oi.dwPlatformId) {
3721 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3722 case VER_PLATFORM_WIN32_NT:
3723 _is_nt = true;
3724 {
3725 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3726 if (os_vers == 5002) {
3727 _is_windows_2003 = true;
3728 }
3729 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3730 oi.wProductType == VER_NT_SERVER) {
3731 _is_windows_server = true;
3732 }
3733 }
3734 break;
3735 default: fatal("Unknown platform");
3736 }
3737
3738 _default_stack_size = os::current_stack_size();
3739 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3740 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3741 "stack size not a multiple of page size");
3742
3743 initialize_performance_counter();
3744
3745 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3746 // known to deadlock the system, if the VM issues to thread operations with
3747 // a too high frequency, e.g., such as changing the priorities.
3748 // The 6000 seems to work well - no deadlocks has been notices on the test
3749 // programs that we have seen experience this problem.
3750 if (!os::win32::is_nt()) {
3751 StarvationMonitorInterval = 6000;
3752 }
3753 }
3754
3755
3756 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3757 char path[MAX_PATH];
3758 DWORD size;
3759 DWORD pathLen = (DWORD)sizeof(path);
3760 HINSTANCE result = NULL;
3761
3762 // only allow library name without path component
3763 assert(strchr(name, '\\') == NULL, "path not allowed");
3764 assert(strchr(name, ':') == NULL, "path not allowed");
3765 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3766 jio_snprintf(ebuf, ebuflen,
3767 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3768 return NULL;
3769 }
3770
3771 // search system directory
3772 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3773 strcat(path, "\\");
3774 strcat(path, name);
3775 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3776 return result;
3777 }
3778 }
3779
3780 // try Windows directory
3781 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3782 strcat(path, "\\");
3783 strcat(path, name);
3784 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3785 return result;
3786 }
3787 }
3788
3789 jio_snprintf(ebuf, ebuflen,
3790 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3791 return NULL;
3792 }
3793
3794 void os::win32::setmode_streams() {
3795 _setmode(_fileno(stdin), _O_BINARY);
3796 _setmode(_fileno(stdout), _O_BINARY);
3797 _setmode(_fileno(stderr), _O_BINARY);
3798 }
3799
3800
3801 bool os::is_debugger_attached() {
3802 return IsDebuggerPresent() ? true : false;
3803 }
3804
3805
3806 void os::wait_for_keypress_at_exit(void) {
3807 if (PauseAtExit) {
3808 fprintf(stderr, "Press any key to continue...\n");
3809 fgetc(stdin);
3810 }
3811 }
3812
3813
3814 int os::message_box(const char* title, const char* message) {
3815 int result = MessageBox(NULL, message, title,
3816 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3817 return result == IDYES;
3818 }
3819
3820 int os::allocate_thread_local_storage() {
3821 return TlsAlloc();
3822 }
3823
3824
3825 void os::free_thread_local_storage(int index) {
3826 TlsFree(index);
3827 }
3828
3829
3830 void os::thread_local_storage_at_put(int index, void* value) {
3831 TlsSetValue(index, value);
3832 assert(thread_local_storage_at(index) == value, "Just checking");
3833 }
3834
3835
3836 void* os::thread_local_storage_at(int index) {
3837 return TlsGetValue(index);
3838 }
3839
3840
3841 #ifndef PRODUCT
3842 #ifndef _WIN64
3843 // Helpers to check whether NX protection is enabled
3844 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3845 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3846 pex->ExceptionRecord->NumberParameters > 0 &&
3847 pex->ExceptionRecord->ExceptionInformation[0] ==
3848 EXCEPTION_INFO_EXEC_VIOLATION) {
3849 return EXCEPTION_EXECUTE_HANDLER;
3850 }
3851 return EXCEPTION_CONTINUE_SEARCH;
3852 }
3853
3854 void nx_check_protection() {
3855 // If NX is enabled we'll get an exception calling into code on the stack
3856 char code[] = { (char)0xC3 }; // ret
3857 void *code_ptr = (void *)code;
3858 __try {
3859 __asm call code_ptr
3860 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3861 tty->print_raw_cr("NX protection detected.");
3862 }
3863 }
3864 #endif // _WIN64
3865 #endif // PRODUCT
3866
3867 // this is called _before_ the global arguments have been parsed
3868 void os::init(void) {
3869 _initial_pid = _getpid();
3870
3871 init_random(1234567);
3872
3873 win32::initialize_system_info();
3874 win32::setmode_streams();
3875 init_page_sizes((size_t) win32::vm_page_size());
3876
3877 // This may be overridden later when argument processing is done.
3878 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3879 os::win32::is_windows_2003());
3880
3881 // Initialize main_process and main_thread
3882 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3883 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3884 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3885 fatal("DuplicateHandle failed\n");
3886 }
3887 main_thread_id = (int) GetCurrentThreadId();
3888 }
3889
3890 // To install functions for atexit processing
3891 extern "C" {
3892 static void perfMemory_exit_helper() {
3893 perfMemory_exit();
3894 }
3895 }
3896
3897 static jint initSock();
3898
3899 // this is called _after_ the global arguments have been parsed
3900 jint os::init_2(void) {
3901 // Allocate a single page and mark it as readable for safepoint polling
3902 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3903 guarantee(polling_page != NULL, "Reserve Failed for polling page");
3904
3905 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3906 guarantee(return_page != NULL, "Commit Failed for polling page");
3907
3908 os::set_polling_page(polling_page);
3909
3910 #ifndef PRODUCT
3911 if (Verbose && PrintMiscellaneous)
3912 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3913 #endif
3914
3915 if (!UseMembar) {
3916 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3917 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3918
3919 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3920 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
3921
3922 os::set_memory_serialize_page(mem_serialize_page);
3923
3924 #ifndef PRODUCT
3925 if (Verbose && PrintMiscellaneous)
3926 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3927 #endif
3928 }
3929
3930 // Setup Windows Exceptions
3931
3932 // for debugging float code generation bugs
3933 if (ForceFloatExceptions) {
3934 #ifndef _WIN64
3935 static long fp_control_word = 0;
3936 __asm { fstcw fp_control_word }
3937 // see Intel PPro Manual, Vol. 2, p 7-16
3938 const long precision = 0x20;
3939 const long underflow = 0x10;
3940 const long overflow = 0x08;
3941 const long zero_div = 0x04;
3942 const long denorm = 0x02;
3943 const long invalid = 0x01;
3944 fp_control_word |= invalid;
3945 __asm { fldcw fp_control_word }
3946 #endif
3947 }
3948
3949 // If stack_commit_size is 0, windows will reserve the default size,
3950 // but only commit a small portion of it.
3951 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3952 size_t default_reserve_size = os::win32::default_stack_size();
3953 size_t actual_reserve_size = stack_commit_size;
3954 if (stack_commit_size < default_reserve_size) {
3955 // If stack_commit_size == 0, we want this too
3956 actual_reserve_size = default_reserve_size;
3957 }
3958
3959 // Check minimum allowable stack size for thread creation and to initialize
3960 // the java system classes, including StackOverflowError - depends on page
3961 // size. Add a page for compiler2 recursion in main thread.
3962 // Add in 2*BytesPerWord times page size to account for VM stack during
3963 // class initialization depending on 32 or 64 bit VM.
3964 size_t min_stack_allowed =
3965 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3966 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3967 if (actual_reserve_size < min_stack_allowed) {
3968 tty->print_cr("\nThe stack size specified is too small, "
3969 "Specify at least %dk",
3970 min_stack_allowed / K);
3971 return JNI_ERR;
3972 }
3973
3974 JavaThread::set_stack_size_at_create(stack_commit_size);
3975
3976 // Calculate theoretical max. size of Threads to guard gainst artifical
3977 // out-of-memory situations, where all available address-space has been
3978 // reserved by thread stacks.
3979 assert(actual_reserve_size != 0, "Must have a stack");
3980
3981 // Calculate the thread limit when we should start doing Virtual Memory
3982 // banging. Currently when the threads will have used all but 200Mb of space.
3983 //
3984 // TODO: consider performing a similar calculation for commit size instead
3985 // as reserve size, since on a 64-bit platform we'll run into that more
3986 // often than running out of virtual memory space. We can use the
3987 // lower value of the two calculations as the os_thread_limit.
3988 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3989 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3990
3991 // at exit methods are called in the reverse order of their registration.
3992 // there is no limit to the number of functions registered. atexit does
3993 // not set errno.
3994
3995 if (PerfAllowAtExitRegistration) {
3996 // only register atexit functions if PerfAllowAtExitRegistration is set.
3997 // atexit functions can be delayed until process exit time, which
3998 // can be problematic for embedded VM situations. Embedded VMs should
3999 // call DestroyJavaVM() to assure that VM resources are released.
4000
4001 // note: perfMemory_exit_helper atexit function may be removed in
4002 // the future if the appropriate cleanup code can be added to the
4003 // VM_Exit VMOperation's doit method.
4004 if (atexit(perfMemory_exit_helper) != 0) {
4005 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4006 }
4007 }
4008
4009 #ifndef _WIN64
4010 // Print something if NX is enabled (win32 on AMD64)
4011 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4012 #endif
4013
4014 // initialize thread priority policy
4015 prio_init();
4016
4017 if (UseNUMA && !ForceNUMA) {
4018 UseNUMA = false; // We don't fully support this yet
4019 }
4020
4021 if (UseNUMAInterleaving) {
4022 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4023 bool success = numa_interleaving_init();
4024 if (!success) UseNUMAInterleaving = false;
4025 }
4026
4027 if (initSock() != JNI_OK) {
4028 return JNI_ERR;
4029 }
4030
4031 return JNI_OK;
4032 }
4033
4034 void os::init_3(void) {
4035 return;
4036 }
4037
4038 // Mark the polling page as unreadable
4039 void os::make_polling_page_unreadable(void) {
4040 DWORD old_status;
4041 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status))
4042 fatal("Could not disable polling page");
4043 };
4044
4045 // Mark the polling page as readable
4046 void os::make_polling_page_readable(void) {
4047 DWORD old_status;
4048 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status))
4049 fatal("Could not enable polling page");
4050 };
4051
4052
4053 int os::stat(const char *path, struct stat *sbuf) {
4054 char pathbuf[MAX_PATH];
4055 if (strlen(path) > MAX_PATH - 1) {
4056 errno = ENAMETOOLONG;
4057 return -1;
4058 }
4059 os::native_path(strcpy(pathbuf, path));
4060 int ret = ::stat(pathbuf, sbuf);
4061 if (sbuf != NULL && UseUTCFileTimestamp) {
4062 // Fix for 6539723. st_mtime returned from stat() is dependent on
4063 // the system timezone and so can return different values for the
4064 // same file if/when daylight savings time changes. This adjustment
4065 // makes sure the same timestamp is returned regardless of the TZ.
4066 //
4067 // See:
4068 // http://msdn.microsoft.com/library/
4069 // default.asp?url=/library/en-us/sysinfo/base/
4070 // time_zone_information_str.asp
4071 // and
4072 // http://msdn.microsoft.com/library/default.asp?url=
4073 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4074 //
4075 // NOTE: there is a insidious bug here: If the timezone is changed
4076 // after the call to stat() but before 'GetTimeZoneInformation()', then
4077 // the adjustment we do here will be wrong and we'll return the wrong
4078 // value (which will likely end up creating an invalid class data
4079 // archive). Absent a better API for this, or some time zone locking
4080 // mechanism, we'll have to live with this risk.
4081 TIME_ZONE_INFORMATION tz;
4082 DWORD tzid = GetTimeZoneInformation(&tz);
4083 int daylightBias =
4084 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4085 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4086 }
4087 return ret;
4088 }
4089
4090
4091 #define FT2INT64(ft) \
4092 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4093
4094
4095 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4096 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4097 // of a thread.
4098 //
4099 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4100 // the fast estimate available on the platform.
4101
4102 // current_thread_cpu_time() is not optimized for Windows yet
4103 jlong os::current_thread_cpu_time() {
4104 // return user + sys since the cost is the same
4105 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4106 }
4107
4108 jlong os::thread_cpu_time(Thread* thread) {
4109 // consistent with what current_thread_cpu_time() returns.
4110 return os::thread_cpu_time(thread, true /* user+sys */);
4111 }
4112
4113 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4114 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4115 }
4116
4117 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4118 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4119 // If this function changes, os::is_thread_cpu_time_supported() should too
4120 if (os::win32::is_nt()) {
4121 FILETIME CreationTime;
4122 FILETIME ExitTime;
4123 FILETIME KernelTime;
4124 FILETIME UserTime;
4125
4126 if (GetThreadTimes(thread->osthread()->thread_handle(),
4127 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4128 return -1;
4129 else
4130 if (user_sys_cpu_time) {
4131 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4132 } else {
4133 return FT2INT64(UserTime) * 100;
4134 }
4135 } else {
4136 return (jlong) timeGetTime() * 1000000;
4137 }
4138 }
4139
4140 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4141 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4142 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4143 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4144 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4145 }
4146
4147 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4148 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4149 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4150 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4151 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4152 }
4153
4154 bool os::is_thread_cpu_time_supported() {
4155 // see os::thread_cpu_time
4156 if (os::win32::is_nt()) {
4157 FILETIME CreationTime;
4158 FILETIME ExitTime;
4159 FILETIME KernelTime;
4160 FILETIME UserTime;
4161
4162 if (GetThreadTimes(GetCurrentThread(),
4163 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4164 return false;
4165 else
4166 return true;
4167 } else {
4168 return false;
4169 }
4170 }
4171
4172 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4173 // It does have primitives (PDH API) to get CPU usage and run queue length.
4174 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4175 // If we wanted to implement loadavg on Windows, we have a few options:
4176 //
4177 // a) Query CPU usage and run queue length and "fake" an answer by
4178 // returning the CPU usage if it's under 100%, and the run queue
4179 // length otherwise. It turns out that querying is pretty slow
4180 // on Windows, on the order of 200 microseconds on a fast machine.
4181 // Note that on the Windows the CPU usage value is the % usage
4182 // since the last time the API was called (and the first call
4183 // returns 100%), so we'd have to deal with that as well.
4184 //
4185 // b) Sample the "fake" answer using a sampling thread and store
4186 // the answer in a global variable. The call to loadavg would
4187 // just return the value of the global, avoiding the slow query.
4188 //
4189 // c) Sample a better answer using exponential decay to smooth the
4190 // value. This is basically the algorithm used by UNIX kernels.
4191 //
4192 // Note that sampling thread starvation could affect both (b) and (c).
4193 int os::loadavg(double loadavg[], int nelem) {
4194 return -1;
4195 }
4196
4197
4198 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4199 bool os::dont_yield() {
4200 return DontYieldALot;
4201 }
4202
4203 // This method is a slightly reworked copy of JDK's sysOpen
4204 // from src/windows/hpi/src/sys_api_md.c
4205
4206 int os::open(const char *path, int oflag, int mode) {
4207 char pathbuf[MAX_PATH];
4208
4209 if (strlen(path) > MAX_PATH - 1) {
4210 errno = ENAMETOOLONG;
4211 return -1;
4212 }
4213 os::native_path(strcpy(pathbuf, path));
4214 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4215 }
4216
4217 FILE* os::open(int fd, const char* mode) {
4218 return ::_fdopen(fd, mode);
4219 }
4220
4221 // Is a (classpath) directory empty?
4222 bool os::dir_is_empty(const char* path) {
4223 WIN32_FIND_DATA fd;
4224 HANDLE f = FindFirstFile(path, &fd);
4225 if (f == INVALID_HANDLE_VALUE) {
4226 return true;
4227 }
4228 FindClose(f);
4229 return false;
4230 }
4231
4232 // create binary file, rewriting existing file if required
4233 int os::create_binary_file(const char* path, bool rewrite_existing) {
4234 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4235 if (!rewrite_existing) {
4236 oflags |= _O_EXCL;
4237 }
4238 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4239 }
4240
4241 // return current position of file pointer
4242 jlong os::current_file_offset(int fd) {
4243 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4244 }
4245
4246 // move file pointer to the specified offset
4247 jlong os::seek_to_file_offset(int fd, jlong offset) {
4248 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4249 }
4250
4251
4252 jlong os::lseek(int fd, jlong offset, int whence) {
4253 return (jlong) ::_lseeki64(fd, offset, whence);
4254 }
4255
4256 // This method is a slightly reworked copy of JDK's sysNativePath
4257 // from src/windows/hpi/src/path_md.c
4258
4259 /* Convert a pathname to native format. On win32, this involves forcing all
4260 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4261 sometimes rejects '/') and removing redundant separators. The input path is
4262 assumed to have been converted into the character encoding used by the local
4263 system. Because this might be a double-byte encoding, care is taken to
4264 treat double-byte lead characters correctly.
4265
4266 This procedure modifies the given path in place, as the result is never
4267 longer than the original. There is no error return; this operation always
4268 succeeds. */
4269 char * os::native_path(char *path) {
4270 char *src = path, *dst = path, *end = path;
4271 char *colon = NULL; /* If a drive specifier is found, this will
4272 point to the colon following the drive
4273 letter */
4274
4275 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4276 assert(((!::IsDBCSLeadByte('/'))
4277 && (!::IsDBCSLeadByte('\\'))
4278 && (!::IsDBCSLeadByte(':'))),
4279 "Illegal lead byte");
4280
4281 /* Check for leading separators */
4282 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4283 while (isfilesep(*src)) {
4284 src++;
4285 }
4286
4287 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4288 /* Remove leading separators if followed by drive specifier. This
4289 hack is necessary to support file URLs containing drive
4290 specifiers (e.g., "file://c:/path"). As a side effect,
4291 "/c:/path" can be used as an alternative to "c:/path". */
4292 *dst++ = *src++;
4293 colon = dst;
4294 *dst++ = ':';
4295 src++;
4296 } else {
4297 src = path;
4298 if (isfilesep(src[0]) && isfilesep(src[1])) {
4299 /* UNC pathname: Retain first separator; leave src pointed at
4300 second separator so that further separators will be collapsed
4301 into the second separator. The result will be a pathname
4302 beginning with "\\\\" followed (most likely) by a host name. */
4303 src = dst = path + 1;
4304 path[0] = '\\'; /* Force first separator to '\\' */
4305 }
4306 }
4307
4308 end = dst;
4309
4310 /* Remove redundant separators from remainder of path, forcing all
4311 separators to be '\\' rather than '/'. Also, single byte space
4312 characters are removed from the end of the path because those
4313 are not legal ending characters on this operating system.
4314 */
4315 while (*src != '\0') {
4316 if (isfilesep(*src)) {
4317 *dst++ = '\\'; src++;
4318 while (isfilesep(*src)) src++;
4319 if (*src == '\0') {
4320 /* Check for trailing separator */
4321 end = dst;
4322 if (colon == dst - 2) break; /* "z:\\" */
4323 if (dst == path + 1) break; /* "\\" */
4324 if (dst == path + 2 && isfilesep(path[0])) {
4325 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4326 beginning of a UNC pathname. Even though it is not, by
4327 itself, a valid UNC pathname, we leave it as is in order
4328 to be consistent with the path canonicalizer as well
4329 as the win32 APIs, which treat this case as an invalid
4330 UNC pathname rather than as an alias for the root
4331 directory of the current drive. */
4332 break;
4333 }
4334 end = --dst; /* Path does not denote a root directory, so
4335 remove trailing separator */
4336 break;
4337 }
4338 end = dst;
4339 } else {
4340 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4341 *dst++ = *src++;
4342 if (*src) *dst++ = *src++;
4343 end = dst;
4344 } else { /* Copy a single-byte character */
4345 char c = *src++;
4346 *dst++ = c;
4347 /* Space is not a legal ending character */
4348 if (c != ' ') end = dst;
4349 }
4350 }
4351 }
4352
4353 *end = '\0';
4354
4355 /* For "z:", add "." to work around a bug in the C runtime library */
4356 if (colon == dst - 1) {
4357 path[2] = '.';
4358 path[3] = '\0';
4359 }
4360
4361 return path;
4362 }
4363
4364 // This code is a copy of JDK's sysSetLength
4365 // from src/windows/hpi/src/sys_api_md.c
4366
4367 int os::ftruncate(int fd, jlong length) {
4368 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4369 long high = (long)(length >> 32);
4370 DWORD ret;
4371
4372 if (h == (HANDLE)(-1)) {
4373 return -1;
4374 }
4375
4376 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4377 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4378 return -1;
4379 }
4380
4381 if (::SetEndOfFile(h) == FALSE) {
4382 return -1;
4383 }
4384
4385 return 0;
4386 }
4387
4388
4389 // This code is a copy of JDK's sysSync
4390 // from src/windows/hpi/src/sys_api_md.c
4391 // except for the legacy workaround for a bug in Win 98
4392
4393 int os::fsync(int fd) {
4394 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4395
4396 if ((!::FlushFileBuffers(handle)) &&
4397 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4398 /* from winerror.h */
4399 return -1;
4400 }
4401 return 0;
4402 }
4403
4404 static int nonSeekAvailable(int, long *);
4405 static int stdinAvailable(int, long *);
4406
4407 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4408 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4409
4410 // This code is a copy of JDK's sysAvailable
4411 // from src/windows/hpi/src/sys_api_md.c
4412
4413 int os::available(int fd, jlong *bytes) {
4414 jlong cur, end;
4415 struct _stati64 stbuf64;
4416
4417 if (::_fstati64(fd, &stbuf64) >= 0) {
4418 int mode = stbuf64.st_mode;
4419 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4420 int ret;
4421 long lpbytes;
4422 if (fd == 0) {
4423 ret = stdinAvailable(fd, &lpbytes);
4424 } else {
4425 ret = nonSeekAvailable(fd, &lpbytes);
4426 }
4427 (*bytes) = (jlong)(lpbytes);
4428 return ret;
4429 }
4430 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4431 return FALSE;
4432 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4433 return FALSE;
4434 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4435 return FALSE;
4436 }
4437 *bytes = end - cur;
4438 return TRUE;
4439 } else {
4440 return FALSE;
4441 }
4442 }
4443
4444 // This code is a copy of JDK's nonSeekAvailable
4445 // from src/windows/hpi/src/sys_api_md.c
4446
4447 static int nonSeekAvailable(int fd, long *pbytes) {
4448 /* This is used for available on non-seekable devices
4449 * (like both named and anonymous pipes, such as pipes
4450 * connected to an exec'd process).
4451 * Standard Input is a special case.
4452 *
4453 */
4454 HANDLE han;
4455
4456 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4457 return FALSE;
4458 }
4459
4460 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4461 /* PeekNamedPipe fails when at EOF. In that case we
4462 * simply make *pbytes = 0 which is consistent with the
4463 * behavior we get on Solaris when an fd is at EOF.
4464 * The only alternative is to raise an Exception,
4465 * which isn't really warranted.
4466 */
4467 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4468 return FALSE;
4469 }
4470 *pbytes = 0;
4471 }
4472 return TRUE;
4473 }
4474
4475 #define MAX_INPUT_EVENTS 2000
4476
4477 // This code is a copy of JDK's stdinAvailable
4478 // from src/windows/hpi/src/sys_api_md.c
4479
4480 static int stdinAvailable(int fd, long *pbytes) {
4481 HANDLE han;
4482 DWORD numEventsRead = 0; /* Number of events read from buffer */
4483 DWORD numEvents = 0; /* Number of events in buffer */
4484 DWORD i = 0; /* Loop index */
4485 DWORD curLength = 0; /* Position marker */
4486 DWORD actualLength = 0; /* Number of bytes readable */
4487 BOOL error = FALSE; /* Error holder */
4488 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4489
4490 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4491 return FALSE;
4492 }
4493
4494 /* Construct an array of input records in the console buffer */
4495 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4496 if (error == 0) {
4497 return nonSeekAvailable(fd, pbytes);
4498 }
4499
4500 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4501 if (numEvents > MAX_INPUT_EVENTS) {
4502 numEvents = MAX_INPUT_EVENTS;
4503 }
4504
4505 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4506 if (lpBuffer == NULL) {
4507 return FALSE;
4508 }
4509
4510 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4511 if (error == 0) {
4512 os::free(lpBuffer, mtInternal);
4513 return FALSE;
4514 }
4515
4516 /* Examine input records for the number of bytes available */
4517 for (i=0; i<numEvents; i++) {
4518 if (lpBuffer[i].EventType == KEY_EVENT) {
4519
4520 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4521 &(lpBuffer[i].Event);
4522 if (keyRecord->bKeyDown == TRUE) {
4523 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4524 curLength++;
4525 if (*keyPressed == '\r') {
4526 actualLength = curLength;
4527 }
4528 }
4529 }
4530 }
4531
4532 if (lpBuffer != NULL) {
4533 os::free(lpBuffer, mtInternal);
4534 }
4535
4536 *pbytes = (long) actualLength;
4537 return TRUE;
4538 }
4539
4540 // Map a block of memory.
4541 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4542 char *addr, size_t bytes, bool read_only,
4543 bool allow_exec) {
4544 HANDLE hFile;
4545 char* base;
4546
4547 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4548 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4549 if (hFile == NULL) {
4550 if (PrintMiscellaneous && Verbose) {
4551 DWORD err = GetLastError();
4552 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4553 }
4554 return NULL;
4555 }
4556
4557 if (allow_exec) {
4558 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4559 // unless it comes from a PE image (which the shared archive is not.)
4560 // Even VirtualProtect refuses to give execute access to mapped memory
4561 // that was not previously executable.
4562 //
4563 // Instead, stick the executable region in anonymous memory. Yuck.
4564 // Penalty is that ~4 pages will not be shareable - in the future
4565 // we might consider DLLizing the shared archive with a proper PE
4566 // header so that mapping executable + sharing is possible.
4567
4568 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4569 PAGE_READWRITE);
4570 if (base == NULL) {
4571 if (PrintMiscellaneous && Verbose) {
4572 DWORD err = GetLastError();
4573 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4574 }
4575 CloseHandle(hFile);
4576 return NULL;
4577 }
4578
4579 DWORD bytes_read;
4580 OVERLAPPED overlapped;
4581 overlapped.Offset = (DWORD)file_offset;
4582 overlapped.OffsetHigh = 0;
4583 overlapped.hEvent = NULL;
4584 // ReadFile guarantees that if the return value is true, the requested
4585 // number of bytes were read before returning.
4586 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4587 if (!res) {
4588 if (PrintMiscellaneous && Verbose) {
4589 DWORD err = GetLastError();
4590 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4591 }
4592 release_memory(base, bytes);
4593 CloseHandle(hFile);
4594 return NULL;
4595 }
4596 } else {
4597 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4598 NULL /*file_name*/);
4599 if (hMap == NULL) {
4600 if (PrintMiscellaneous && Verbose) {
4601 DWORD err = GetLastError();
4602 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4603 }
4604 CloseHandle(hFile);
4605 return NULL;
4606 }
4607
4608 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4609 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4610 (DWORD)bytes, addr);
4611 if (base == NULL) {
4612 if (PrintMiscellaneous && Verbose) {
4613 DWORD err = GetLastError();
4614 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4615 }
4616 CloseHandle(hMap);
4617 CloseHandle(hFile);
4618 return NULL;
4619 }
4620
4621 if (CloseHandle(hMap) == 0) {
4622 if (PrintMiscellaneous && Verbose) {
4623 DWORD err = GetLastError();
4624 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4625 }
4626 CloseHandle(hFile);
4627 return base;
4628 }
4629 }
4630
4631 if (allow_exec) {
4632 DWORD old_protect;
4633 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4634 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4635
4636 if (!res) {
4637 if (PrintMiscellaneous && Verbose) {
4638 DWORD err = GetLastError();
4639 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4640 }
4641 // Don't consider this a hard error, on IA32 even if the
4642 // VirtualProtect fails, we should still be able to execute
4643 CloseHandle(hFile);
4644 return base;
4645 }
4646 }
4647
4648 if (CloseHandle(hFile) == 0) {
4649 if (PrintMiscellaneous && Verbose) {
4650 DWORD err = GetLastError();
4651 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4652 }
4653 return base;
4654 }
4655
4656 return base;
4657 }
4658
4659
4660 // Remap a block of memory.
4661 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4662 char *addr, size_t bytes, bool read_only,
4663 bool allow_exec) {
4664 // This OS does not allow existing memory maps to be remapped so we
4665 // have to unmap the memory before we remap it.
4666 if (!os::unmap_memory(addr, bytes)) {
4667 return NULL;
4668 }
4669
4670 // There is a very small theoretical window between the unmap_memory()
4671 // call above and the map_memory() call below where a thread in native
4672 // code may be able to access an address that is no longer mapped.
4673
4674 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4675 read_only, allow_exec);
4676 }
4677
4678
4679 // Unmap a block of memory.
4680 // Returns true=success, otherwise false.
4681
4682 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4683 BOOL result = UnmapViewOfFile(addr);
4684 if (result == 0) {
4685 if (PrintMiscellaneous && Verbose) {
4686 DWORD err = GetLastError();
4687 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4688 }
4689 return false;
4690 }
4691 return true;
4692 }
4693
4694 void os::pause() {
4695 char filename[MAX_PATH];
4696 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4697 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4698 } else {
4699 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4700 }
4701
4702 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4703 if (fd != -1) {
4704 struct stat buf;
4705 ::close(fd);
4706 while (::stat(filename, &buf) == 0) {
4707 Sleep(100);
4708 }
4709 } else {
4710 jio_fprintf(stderr,
4711 "Could not open pause file '%s', continuing immediately.\n", filename);
4712 }
4713 }
4714
4715 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4716 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4717 }
4718
4719 /*
4720 * See the caveats for this class in os_windows.hpp
4721 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4722 * into this method and returns false. If no OS EXCEPTION was raised, returns
4723 * true.
4724 * The callback is supposed to provide the method that should be protected.
4725 */
4726 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4727 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4728 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4729 "crash_protection already set?");
4730
4731 bool success = true;
4732 __try {
4733 WatcherThread::watcher_thread()->set_crash_protection(this);
4734 cb.call();
4735 } __except(EXCEPTION_EXECUTE_HANDLER) {
4736 // only for protection, nothing to do
4737 success = false;
4738 }
4739 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4740 return success;
4741 }
4742
4743 // An Event wraps a win32 "CreateEvent" kernel handle.
4744 //
4745 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4746 //
4747 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4748 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4749 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4750 // In addition, an unpark() operation might fetch the handle field, but the
4751 // event could recycle between the fetch and the SetEvent() operation.
4752 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4753 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4754 // on an stale but recycled handle would be harmless, but in practice this might
4755 // confuse other non-Sun code, so it's not a viable approach.
4756 //
4757 // 2: Once a win32 event handle is associated with an Event, it remains associated
4758 // with the Event. The event handle is never closed. This could be construed
4759 // as handle leakage, but only up to the maximum # of threads that have been extant
4760 // at any one time. This shouldn't be an issue, as windows platforms typically
4761 // permit a process to have hundreds of thousands of open handles.
4762 //
4763 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4764 // and release unused handles.
4765 //
4766 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4767 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4768 //
4769 // 5. Use an RCU-like mechanism (Read-Copy Update).
4770 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4771 //
4772 // We use (2).
4773 //
4774 // TODO-FIXME:
4775 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4776 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4777 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4778 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4779 // into a single win32 CreateEvent() handle.
4780 //
4781 // _Event transitions in park()
4782 // -1 => -1 : illegal
4783 // 1 => 0 : pass - return immediately
4784 // 0 => -1 : block
4785 //
4786 // _Event serves as a restricted-range semaphore :
4787 // -1 : thread is blocked
4788 // 0 : neutral - thread is running or ready
4789 // 1 : signaled - thread is running or ready
4790 //
4791 // Another possible encoding of _Event would be
4792 // with explicit "PARKED" and "SIGNALED" bits.
4793
4794 int os::PlatformEvent::park (jlong Millis) {
4795 guarantee(_ParkHandle != NULL , "Invariant");
4796 guarantee(Millis > 0 , "Invariant");
4797 int v;
4798
4799 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4800 // the initial park() operation.
4801
4802 for (;;) {
4803 v = _Event;
4804 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4805 }
4806 guarantee((v == 0) || (v == 1), "invariant");
4807 if (v != 0) return OS_OK;
4808
4809 // Do this the hard way by blocking ...
4810 // TODO: consider a brief spin here, gated on the success of recent
4811 // spin attempts by this thread.
4812 //
4813 // We decompose long timeouts into series of shorter timed waits.
4814 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4815 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4816 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4817 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4818 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4819 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4820 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4821 // for the already waited time. This policy does not admit any new outcomes.
4822 // In the future, however, we might want to track the accumulated wait time and
4823 // adjust Millis accordingly if we encounter a spurious wakeup.
4824
4825 const int MAXTIMEOUT = 0x10000000;
4826 DWORD rv = WAIT_TIMEOUT;
4827 while (_Event < 0 && Millis > 0) {
4828 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
4829 if (Millis > MAXTIMEOUT) {
4830 prd = MAXTIMEOUT;
4831 }
4832 rv = ::WaitForSingleObject(_ParkHandle, prd);
4833 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
4834 if (rv == WAIT_TIMEOUT) {
4835 Millis -= prd;
4836 }
4837 }
4838 v = _Event;
4839 _Event = 0;
4840 // see comment at end of os::PlatformEvent::park() below:
4841 OrderAccess::fence();
4842 // If we encounter a nearly simultanous timeout expiry and unpark()
4843 // we return OS_OK indicating we awoke via unpark().
4844 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4845 return (v >= 0) ? OS_OK : OS_TIMEOUT;
4846 }
4847
4848 void os::PlatformEvent::park() {
4849 guarantee(_ParkHandle != NULL, "Invariant");
4850 // Invariant: Only the thread associated with the Event/PlatformEvent
4851 // may call park().
4852 int v;
4853 for (;;) {
4854 v = _Event;
4855 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4856 }
4857 guarantee((v == 0) || (v == 1), "invariant");
4858 if (v != 0) return;
4859
4860 // Do this the hard way by blocking ...
4861 // TODO: consider a brief spin here, gated on the success of recent
4862 // spin attempts by this thread.
4863 while (_Event < 0) {
4864 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
4865 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
4866 }
4867
4868 // Usually we'll find _Event == 0 at this point, but as
4869 // an optional optimization we clear it, just in case can
4870 // multiple unpark() operations drove _Event up to 1.
4871 _Event = 0;
4872 OrderAccess::fence();
4873 guarantee(_Event >= 0, "invariant");
4874 }
4875
4876 void os::PlatformEvent::unpark() {
4877 guarantee(_ParkHandle != NULL, "Invariant");
4878
4879 // Transitions for _Event:
4880 // 0 :=> 1
4881 // 1 :=> 1
4882 // -1 :=> either 0 or 1; must signal target thread
4883 // That is, we can safely transition _Event from -1 to either
4884 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4885 // unpark() calls.
4886 // See also: "Semaphores in Plan 9" by Mullender & Cox
4887 //
4888 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4889 // that it will take two back-to-back park() calls for the owning
4890 // thread to block. This has the benefit of forcing a spurious return
4891 // from the first park() call after an unpark() call which will help
4892 // shake out uses of park() and unpark() without condition variables.
4893
4894 if (Atomic::xchg(1, &_Event) >= 0) return;
4895
4896 ::SetEvent(_ParkHandle);
4897 }
4898
4899
4900 // JSR166
4901 // -------------------------------------------------------
4902
4903 /*
4904 * The Windows implementation of Park is very straightforward: Basic
4905 * operations on Win32 Events turn out to have the right semantics to
4906 * use them directly. We opportunistically resuse the event inherited
4907 * from Monitor.
4908 */
4909
4910
4911 void Parker::park(bool isAbsolute, jlong time) {
4912 guarantee(_ParkEvent != NULL, "invariant");
4913 // First, demultiplex/decode time arguments
4914 if (time < 0) { // don't wait
4915 return;
4916 }
4917 else if (time == 0 && !isAbsolute) {
4918 time = INFINITE;
4919 }
4920 else if (isAbsolute) {
4921 time -= os::javaTimeMillis(); // convert to relative time
4922 if (time <= 0) // already elapsed
4923 return;
4924 }
4925 else { // relative
4926 time /= 1000000; // Must coarsen from nanos to millis
4927 if (time == 0) // Wait for the minimal time unit if zero
4928 time = 1;
4929 }
4930
4931 JavaThread* thread = (JavaThread*)(Thread::current());
4932 assert(thread->is_Java_thread(), "Must be JavaThread");
4933 JavaThread *jt = (JavaThread *)thread;
4934
4935 // Don't wait if interrupted or already triggered
4936 if (Thread::is_interrupted(thread, false) ||
4937 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4938 ResetEvent(_ParkEvent);
4939 return;
4940 }
4941 else {
4942 ThreadBlockInVM tbivm(jt);
4943 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4944 jt->set_suspend_equivalent();
4945
4946 WaitForSingleObject(_ParkEvent, time);
4947 ResetEvent(_ParkEvent);
4948
4949 // If externally suspended while waiting, re-suspend
4950 if (jt->handle_special_suspend_equivalent_condition()) {
4951 jt->java_suspend_self();
4952 }
4953 }
4954 }
4955
4956 void Parker::unpark() {
4957 guarantee(_ParkEvent != NULL, "invariant");
4958 SetEvent(_ParkEvent);
4959 }
4960
4961 // Run the specified command in a separate process. Return its exit value,
4962 // or -1 on failure (e.g. can't create a new process).
4963 int os::fork_and_exec(char* cmd) {
4964 STARTUPINFO si;
4965 PROCESS_INFORMATION pi;
4966
4967 memset(&si, 0, sizeof(si));
4968 si.cb = sizeof(si);
4969 memset(&pi, 0, sizeof(pi));
4970 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4971 cmd, // command line
4972 NULL, // process security attribute
4973 NULL, // thread security attribute
4974 TRUE, // inherits system handles
4975 0, // no creation flags
4976 NULL, // use parent's environment block
4977 NULL, // use parent's starting directory
4978 &si, // (in) startup information
4979 &pi); // (out) process information
4980
4981 if (rslt) {
4982 // Wait until child process exits.
4983 WaitForSingleObject(pi.hProcess, INFINITE);
4984
4985 DWORD exit_code;
4986 GetExitCodeProcess(pi.hProcess, &exit_code);
4987
4988 // Close process and thread handles.
4989 CloseHandle(pi.hProcess);
4990 CloseHandle(pi.hThread);
4991
4992 return (int)exit_code;
4993 } else {
4994 return -1;
4995 }
4996 }
4997
4998 //--------------------------------------------------------------------------------------------------
4999 // Non-product code
5000
5001 static int mallocDebugIntervalCounter = 0;
5002 static int mallocDebugCounter = 0;
5003 bool os::check_heap(bool force) {
5004 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5005 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5006 // Note: HeapValidate executes two hardware breakpoints when it finds something
5007 // wrong; at these points, eax contains the address of the offending block (I think).
5008 // To get to the exlicit error message(s) below, just continue twice.
5009 HANDLE heap = GetProcessHeap();
5010
5011 // If we fail to lock the heap, then gflags.exe has been used
5012 // or some other special heap flag has been set that prevents
5013 // locking. We don't try to walk a heap we can't lock.
5014 if (HeapLock(heap) != 0) {
5015 PROCESS_HEAP_ENTRY phe;
5016 phe.lpData = NULL;
5017 while (HeapWalk(heap, &phe) != 0) {
5018 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5019 !HeapValidate(heap, 0, phe.lpData)) {
5020 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5021 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5022 fatal("corrupted C heap");
5023 }
5024 }
5025 DWORD err = GetLastError();
5026 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5027 fatal(err_msg("heap walk aborted with error %d", err));
5028 }
5029 HeapUnlock(heap);
5030 }
5031 mallocDebugIntervalCounter = 0;
5032 }
5033 return true;
5034 }
5035
5036
5037 bool os::find(address addr, outputStream* st) {
5038 // Nothing yet
5039 return false;
5040 }
5041
5042 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5043 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5044
5045 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5046 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5047 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5048 address addr = (address) exceptionRecord->ExceptionInformation[1];
5049
5050 if (os::is_memory_serialize_page(thread, addr))
5051 return EXCEPTION_CONTINUE_EXECUTION;
5052 }
5053
5054 return EXCEPTION_CONTINUE_SEARCH;
5055 }
5056
5057 // We don't build a headless jre for Windows
5058 bool os::is_headless_jre() { return false; }
5059
5060 static jint initSock() {
5061 WSADATA wsadata;
5062
5063 if (!os::WinSock2Dll::WinSock2Available()) {
5064 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5065 ::GetLastError());
5066 return JNI_ERR;
5067 }
5068
5069 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5070 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5071 ::GetLastError());
5072 return JNI_ERR;
5073 }
5074 return JNI_OK;
5075 }
5076
5077 struct hostent* os::get_host_by_name(char* name) {
5078 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5079 }
5080
5081 int os::socket_close(int fd) {
5082 return ::closesocket(fd);
5083 }
5084
5085 int os::socket_available(int fd, jint *pbytes) {
5086 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5087 return (ret < 0) ? 0 : 1;
5088 }
5089
5090 int os::socket(int domain, int type, int protocol) {
5091 return ::socket(domain, type, protocol);
5092 }
5093
5094 int os::listen(int fd, int count) {
5095 return ::listen(fd, count);
5096 }
5097
5098 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5099 return ::connect(fd, him, len);
5100 }
5101
5102 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5103 return ::accept(fd, him, len);
5104 }
5105
5106 int os::sendto(int fd, char* buf, size_t len, uint flags,
5107 struct sockaddr* to, socklen_t tolen) {
5108
5109 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5110 }
5111
5112 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5113 sockaddr* from, socklen_t* fromlen) {
5114
5115 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5116 }
5117
5118 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5119 return ::recv(fd, buf, (int)nBytes, flags);
5120 }
5121
5122 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5123 return ::send(fd, buf, (int)nBytes, flags);
5124 }
5125
5126 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5127 return ::send(fd, buf, (int)nBytes, flags);
5128 }
5129
5130 int os::timeout(int fd, long timeout) {
5131 fd_set tbl;
5132 struct timeval t;
5133
5134 t.tv_sec = timeout / 1000;
5135 t.tv_usec = (timeout % 1000) * 1000;
5136
5137 tbl.fd_count = 1;
5138 tbl.fd_array[0] = fd;
5139
5140 return ::select(1, &tbl, 0, 0, &t);
5141 }
5142
5143 int os::get_host_name(char* name, int namelen) {
5144 return ::gethostname(name, namelen);
5145 }
5146
5147 int os::socket_shutdown(int fd, int howto) {
5148 return ::shutdown(fd, howto);
5149 }
5150
5151 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5152 return ::bind(fd, him, len);
5153 }
5154
5155 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5156 return ::getsockname(fd, him, len);
5157 }
5158
5159 int os::get_sock_opt(int fd, int level, int optname,
5160 char* optval, socklen_t* optlen) {
5161 return ::getsockopt(fd, level, optname, optval, optlen);
5162 }
5163
5164 int os::set_sock_opt(int fd, int level, int optname,
5165 const char* optval, socklen_t optlen) {
5166 return ::setsockopt(fd, level, optname, optval, optlen);
5167 }
5168
5169 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5170 #if defined(IA32)
5171 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5172 #elif defined (AMD64)
5173 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5174 #endif
5175
5176 // returns true if thread could be suspended,
5177 // false otherwise
5178 static bool do_suspend(HANDLE* h) {
5179 if (h != NULL) {
5180 if (SuspendThread(*h) != ~0) {
5181 return true;
5182 }
5183 }
5184 return false;
5185 }
5186
5187 // resume the thread
5188 // calling resume on an active thread is a no-op
5189 static void do_resume(HANDLE* h) {
5190 if (h != NULL) {
5191 ResumeThread(*h);
5192 }
5193 }
5194
5195 // retrieve a suspend/resume context capable handle
5196 // from the tid. Caller validates handle return value.
5197 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5198 if (h != NULL) {
5199 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5200 }
5201 }
5202
5203 //
5204 // Thread sampling implementation
5205 //
5206 void os::SuspendedThreadTask::internal_do_task() {
5207 CONTEXT ctxt;
5208 HANDLE h = NULL;
5209
5210 // get context capable handle for thread
5211 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5212
5213 // sanity
5214 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5215 return;
5216 }
5217
5218 // suspend the thread
5219 if (do_suspend(&h)) {
5220 ctxt.ContextFlags = sampling_context_flags;
5221 // get thread context
5222 GetThreadContext(h, &ctxt);
5223 SuspendedThreadTaskContext context(_thread, &ctxt);
5224 // pass context to Thread Sampling impl
5225 do_task(context);
5226 // resume thread
5227 do_resume(&h);
5228 }
5229
5230 // close handle
5231 CloseHandle(h);
5232 }
5233
5234
5235 // Kernel32 API
5236 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5237 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5238 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5239 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5240 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5241
5242 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5243 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5244 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5245 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5246 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5247
5248
5249 BOOL os::Kernel32Dll::initialized = FALSE;
5250 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5251 assert(initialized && _GetLargePageMinimum != NULL,
5252 "GetLargePageMinimumAvailable() not yet called");
5253 return _GetLargePageMinimum();
5254 }
5255
5256 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5257 if (!initialized) {
5258 initialize();
5259 }
5260 return _GetLargePageMinimum != NULL;
5261 }
5262
5263 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5264 if (!initialized) {
5265 initialize();
5266 }
5267 return _VirtualAllocExNuma != NULL;
5268 }
5269
5270 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5271 assert(initialized && _VirtualAllocExNuma != NULL,
5272 "NUMACallsAvailable() not yet called");
5273
5274 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5275 }
5276
5277 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5278 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5279 "NUMACallsAvailable() not yet called");
5280
5281 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5282 }
5283
5284 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5285 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5286 "NUMACallsAvailable() not yet called");
5287
5288 return _GetNumaNodeProcessorMask(node, proc_mask);
5289 }
5290
5291 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5292 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5293 if (!initialized) {
5294 initialize();
5295 }
5296
5297 if (_RtlCaptureStackBackTrace != NULL) {
5298 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5299 BackTrace, BackTraceHash);
5300 } else {
5301 return 0;
5302 }
5303 }
5304
5305 void os::Kernel32Dll::initializeCommon() {
5306 if (!initialized) {
5307 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5308 assert(handle != NULL, "Just check");
5309 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5310 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5311 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5312 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5313 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5314 initialized = TRUE;
5315 }
5316 }
5317
5318
5319
5320 #ifndef JDK6_OR_EARLIER
5321
5322 void os::Kernel32Dll::initialize() {
5323 initializeCommon();
5324 }
5325
5326
5327 // Kernel32 API
5328 inline BOOL os::Kernel32Dll::SwitchToThread() {
5329 return ::SwitchToThread();
5330 }
5331
5332 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5333 return true;
5334 }
5335
5336 // Help tools
5337 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5338 return true;
5339 }
5340
5341 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5342 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5343 }
5344
5345 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5346 return ::Module32First(hSnapshot, lpme);
5347 }
5348
5349 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5350 return ::Module32Next(hSnapshot, lpme);
5351 }
5352
5353
5354 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5355 return true;
5356 }
5357
5358 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5359 ::GetNativeSystemInfo(lpSystemInfo);
5360 }
5361
5362 // PSAPI API
5363 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5364 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5365 }
5366
5367 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5368 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5369 }
5370
5371 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5372 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5373 }
5374
5375 inline BOOL os::PSApiDll::PSApiAvailable() {
5376 return true;
5377 }
5378
5379
5380 // WinSock2 API
5381 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5382 return ::WSAStartup(wVersionRequested, lpWSAData);
5383 }
5384
5385 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5386 return ::gethostbyname(name);
5387 }
5388
5389 inline BOOL os::WinSock2Dll::WinSock2Available() {
5390 return true;
5391 }
5392
5393 // Advapi API
5394 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5395 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5396 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5397 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5398 BufferLength, PreviousState, ReturnLength);
5399 }
5400
5401 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5402 PHANDLE TokenHandle) {
5403 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5404 }
5405
5406 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5407 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5408 }
5409
5410 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5411 return true;
5412 }
5413
5414 void* os::get_default_process_handle() {
5415 return (void*)GetModuleHandle(NULL);
5416 }
5417
5418 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5419 // which is used to find statically linked in agents.
5420 // Additionally for windows, takes into account __stdcall names.
5421 // Parameters:
5422 // sym_name: Symbol in library we are looking for
5423 // lib_name: Name of library to look in, NULL for shared libs.
5424 // is_absolute_path == true if lib_name is absolute path to agent
5425 // such as "C:/a/b/L.dll"
5426 // == false if only the base name of the library is passed in
5427 // such as "L"
5428 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5429 bool is_absolute_path) {
5430 char *agent_entry_name;
5431 size_t len;
5432 size_t name_len;
5433 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5434 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5435 const char *start;
5436
5437 if (lib_name != NULL) {
5438 len = name_len = strlen(lib_name);
5439 if (is_absolute_path) {
5440 // Need to strip path, prefix and suffix
5441 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5442 lib_name = ++start;
5443 } else {
5444 // Need to check for drive prefix
5445 if ((start = strchr(lib_name, ':')) != NULL) {
5446 lib_name = ++start;
5447 }
5448 }
5449 if (len <= (prefix_len + suffix_len)) {
5450 return NULL;
5451 }
5452 lib_name += prefix_len;
5453 name_len = strlen(lib_name) - suffix_len;
5454 }
5455 }
5456 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5457 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5458 if (agent_entry_name == NULL) {
5459 return NULL;
5460 }
5461 if (lib_name != NULL) {
5462 const char *p = strrchr(sym_name, '@');
5463 if (p != NULL && p != sym_name) {
5464 // sym_name == _Agent_OnLoad@XX
5465 strncpy(agent_entry_name, sym_name, (p - sym_name));
5466 agent_entry_name[(p-sym_name)] = '\0';
5467 // agent_entry_name == _Agent_OnLoad
5468 strcat(agent_entry_name, "_");
5469 strncat(agent_entry_name, lib_name, name_len);
5470 strcat(agent_entry_name, p);
5471 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5472 } else {
5473 strcpy(agent_entry_name, sym_name);
5474 strcat(agent_entry_name, "_");
5475 strncat(agent_entry_name, lib_name, name_len);
5476 }
5477 } else {
5478 strcpy(agent_entry_name, sym_name);
5479 }
5480 return agent_entry_name;
5481 }
5482
5483 #else
5484 // Kernel32 API
5485 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5486 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5487 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5488 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5489 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5490
5491 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5492 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5493 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5494 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5495 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5496
5497 void os::Kernel32Dll::initialize() {
5498 if (!initialized) {
5499 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5500 assert(handle != NULL, "Just check");
5501
5502 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5503 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5504 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5505 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5506 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5507 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5508 initializeCommon(); // resolve the functions that always need resolving
5509
5510 initialized = TRUE;
5511 }
5512 }
5513
5514 BOOL os::Kernel32Dll::SwitchToThread() {
5515 assert(initialized && _SwitchToThread != NULL,
5516 "SwitchToThreadAvailable() not yet called");
5517 return _SwitchToThread();
5518 }
5519
5520
5521 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5522 if (!initialized) {
5523 initialize();
5524 }
5525 return _SwitchToThread != NULL;
5526 }
5527
5528 // Help tools
5529 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5530 if (!initialized) {
5531 initialize();
5532 }
5533 return _CreateToolhelp32Snapshot != NULL &&
5534 _Module32First != NULL &&
5535 _Module32Next != NULL;
5536 }
5537
5538 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5539 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5540 "HelpToolsAvailable() not yet called");
5541
5542 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5543 }
5544
5545 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5546 assert(initialized && _Module32First != NULL,
5547 "HelpToolsAvailable() not yet called");
5548
5549 return _Module32First(hSnapshot, lpme);
5550 }
5551
5552 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5553 assert(initialized && _Module32Next != NULL,
5554 "HelpToolsAvailable() not yet called");
5555
5556 return _Module32Next(hSnapshot, lpme);
5557 }
5558
5559
5560 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5561 if (!initialized) {
5562 initialize();
5563 }
5564 return _GetNativeSystemInfo != NULL;
5565 }
5566
5567 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5568 assert(initialized && _GetNativeSystemInfo != NULL,
5569 "GetNativeSystemInfoAvailable() not yet called");
5570
5571 _GetNativeSystemInfo(lpSystemInfo);
5572 }
5573
5574 // PSAPI API
5575
5576
5577 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5578 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5579 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5580
5581 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5582 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5583 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5584 BOOL os::PSApiDll::initialized = FALSE;
5585
5586 void os::PSApiDll::initialize() {
5587 if (!initialized) {
5588 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5589 if (handle != NULL) {
5590 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5591 "EnumProcessModules");
5592 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5593 "GetModuleFileNameExA");
5594 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5595 "GetModuleInformation");
5596 }
5597 initialized = TRUE;
5598 }
5599 }
5600
5601
5602
5603 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5604 assert(initialized && _EnumProcessModules != NULL,
5605 "PSApiAvailable() not yet called");
5606 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5607 }
5608
5609 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5610 assert(initialized && _GetModuleFileNameEx != NULL,
5611 "PSApiAvailable() not yet called");
5612 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5613 }
5614
5615 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5616 assert(initialized && _GetModuleInformation != NULL,
5617 "PSApiAvailable() not yet called");
5618 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5619 }
5620
5621 BOOL os::PSApiDll::PSApiAvailable() {
5622 if (!initialized) {
5623 initialize();
5624 }
5625 return _EnumProcessModules != NULL &&
5626 _GetModuleFileNameEx != NULL &&
5627 _GetModuleInformation != NULL;
5628 }
5629
5630
5631 // WinSock2 API
5632 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5633 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5634
5635 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5636 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5637 BOOL os::WinSock2Dll::initialized = FALSE;
5638
5639 void os::WinSock2Dll::initialize() {
5640 if (!initialized) {
5641 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5642 if (handle != NULL) {
5643 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5644 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5645 }
5646 initialized = TRUE;
5647 }
5648 }
5649
5650
5651 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5652 assert(initialized && _WSAStartup != NULL,
5653 "WinSock2Available() not yet called");
5654 return _WSAStartup(wVersionRequested, lpWSAData);
5655 }
5656
5657 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5658 assert(initialized && _gethostbyname != NULL,
5659 "WinSock2Available() not yet called");
5660 return _gethostbyname(name);
5661 }
5662
5663 BOOL os::WinSock2Dll::WinSock2Available() {
5664 if (!initialized) {
5665 initialize();
5666 }
5667 return _WSAStartup != NULL &&
5668 _gethostbyname != NULL;
5669 }
5670
5671 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5672 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5673 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5674
5675 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5676 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5677 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5678 BOOL os::Advapi32Dll::initialized = FALSE;
5679
5680 void os::Advapi32Dll::initialize() {
5681 if (!initialized) {
5682 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5683 if (handle != NULL) {
5684 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5685 "AdjustTokenPrivileges");
5686 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5687 "OpenProcessToken");
5688 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5689 "LookupPrivilegeValueA");
5690 }
5691 initialized = TRUE;
5692 }
5693 }
5694
5695 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5696 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5697 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5698 assert(initialized && _AdjustTokenPrivileges != NULL,
5699 "AdvapiAvailable() not yet called");
5700 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5701 BufferLength, PreviousState, ReturnLength);
5702 }
5703
5704 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5705 PHANDLE TokenHandle) {
5706 assert(initialized && _OpenProcessToken != NULL,
5707 "AdvapiAvailable() not yet called");
5708 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5709 }
5710
5711 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5712 assert(initialized && _LookupPrivilegeValue != NULL,
5713 "AdvapiAvailable() not yet called");
5714 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5715 }
5716
5717 BOOL os::Advapi32Dll::AdvapiAvailable() {
5718 if (!initialized) {
5719 initialize();
5720 }
5721 return _AdjustTokenPrivileges != NULL &&
5722 _OpenProcessToken != NULL &&
5723 _LookupPrivilegeValue != NULL;
5724 }
5725
5726 #endif
5727
5728 #ifndef PRODUCT
5729
5730 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5731 // contiguous memory block at a particular address.
5732 // The test first tries to find a good approximate address to allocate at by using the same
5733 // method to allocate some memory at any address. The test then tries to allocate memory in
5734 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5735 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5736 // the previously allocated memory is available for allocation. The only actual failure
5737 // that is reported is when the test tries to allocate at a particular location but gets a
5738 // different valid one. A NULL return value at this point is not considered an error but may
5739 // be legitimate.
5740 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5741 void TestReserveMemorySpecial_test() {
5742 if (!UseLargePages) {
5743 if (VerboseInternalVMTests) {
5744 gclog_or_tty->print("Skipping test because large pages are disabled");
5745 }
5746 return;
5747 }
5748 // save current value of globals
5749 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5750 bool old_use_numa_interleaving = UseNUMAInterleaving;
5751
5752 // set globals to make sure we hit the correct code path
5753 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5754
5755 // do an allocation at an address selected by the OS to get a good one.
5756 const size_t large_allocation_size = os::large_page_size() * 4;
5757 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5758 if (result == NULL) {
5759 if (VerboseInternalVMTests) {
5760 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5761 large_allocation_size);
5762 }
5763 } else {
5764 os::release_memory_special(result, large_allocation_size);
5765
5766 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5767 // we managed to get it once.
5768 const size_t expected_allocation_size = os::large_page_size();
5769 char* expected_location = result + os::large_page_size();
5770 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5771 if (actual_location == NULL) {
5772 if (VerboseInternalVMTests) {
5773 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5774 expected_location, large_allocation_size);
5775 }
5776 } else {
5777 // release memory
5778 os::release_memory_special(actual_location, expected_allocation_size);
5779 // only now check, after releasing any memory to avoid any leaks.
5780 assert(actual_location == expected_location,
5781 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5782 expected_location, expected_allocation_size, actual_location));
5783 }
5784 }
5785
5786 // restore globals
5787 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5788 UseNUMAInterleaving = old_use_numa_interleaving;
5789 }
5790 #endif // PRODUCT
5791