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