1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
75
76
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
83
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
94
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
106
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
111
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #elif _M_AMD64
115 #define __CPU__ amd64
116 #else
117 #define __CPU__ i486
118 #endif
119
120 // save DLL module handle, used by GetModuleFileName
121
122 HINSTANCE vm_lib_handle;
123
124 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
125 switch (reason) {
126 case DLL_PROCESS_ATTACH:
127 vm_lib_handle = hinst;
128 if(ForceTimeHighResolution)
129 timeBeginPeriod(1L);
130 break;
131 case DLL_PROCESS_DETACH:
132 if(ForceTimeHighResolution)
133 timeEndPeriod(1L);
134
135 // Workaround for issue when a custom launcher doesn't call
136 // DestroyJavaVM and NMT is trying to track memory when free is
137 // called from a static destructor
138 if (MemTracker::is_on()) {
139 MemTracker::shutdown(MemTracker::NMT_normal);
140 }
141 break;
142 default:
143 break;
144 }
145 return true;
146 }
147
148 static inline double fileTimeAsDouble(FILETIME* time) {
149 const double high = (double) ((unsigned int) ~0);
150 const double split = 10000000.0;
151 double result = (time->dwLowDateTime / split) +
152 time->dwHighDateTime * (high/split);
153 return result;
154 }
155
156 // Implementation of os
157
158 bool os::getenv(const char* name, char* buffer, int len) {
159 int result = GetEnvironmentVariable(name, buffer, len);
160 return result > 0 && result < len;
161 }
162
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181 void os::init_system_properties_values() {
182 /* sysclasspath, java_home, dll_dir */
183 {
184 char *home_path;
185 char *dll_path;
186 char *pslash;
187 char *bin = "\\bin";
188 char home_dir[MAX_PATH];
189
190 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
191 os::jvm_path(home_dir, sizeof(home_dir));
192 // Found the full path to jvm.dll.
193 // Now cut the path to <java_home>/jre if we can.
194 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
195 pslash = strrchr(home_dir, '\\');
196 if (pslash != NULL) {
197 *pslash = '\0'; /* get rid of \{client|server} */
198 pslash = strrchr(home_dir, '\\');
199 if (pslash != NULL)
200 *pslash = '\0'; /* get rid of \bin */
201 }
202 }
203
204 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
205 if (home_path == NULL)
206 return;
207 strcpy(home_path, home_dir);
208 Arguments::set_java_home(home_path);
209
210 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
211 if (dll_path == NULL)
212 return;
213 strcpy(dll_path, home_dir);
214 strcat(dll_path, bin);
215 Arguments::set_dll_dir(dll_path);
216
217 if (!set_boot_path('\\', ';'))
218 return;
219 }
220
221 /* library_path */
222 #define EXT_DIR "\\lib\\ext"
223 #define BIN_DIR "\\bin"
224 #define PACKAGE_DIR "\\Sun\\Java"
225 {
226 /* Win32 library search order (See the documentation for LoadLibrary):
227 *
228 * 1. The directory from which application is loaded.
229 * 2. The system wide Java Extensions directory (Java only)
230 * 3. System directory (GetSystemDirectory)
231 * 4. Windows directory (GetWindowsDirectory)
232 * 5. The PATH environment variable
233 * 6. The current directory
234 */
235
236 char *library_path;
237 char tmp[MAX_PATH];
238 char *path_str = ::getenv("PATH");
239
240 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
241 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
242
243 library_path[0] = '\0';
244
245 GetModuleFileName(NULL, tmp, sizeof(tmp));
246 *(strrchr(tmp, '\\')) = '\0';
247 strcat(library_path, tmp);
248
249 GetWindowsDirectory(tmp, sizeof(tmp));
250 strcat(library_path, ";");
251 strcat(library_path, tmp);
252 strcat(library_path, PACKAGE_DIR BIN_DIR);
253
254 GetSystemDirectory(tmp, sizeof(tmp));
255 strcat(library_path, ";");
256 strcat(library_path, tmp);
257
258 GetWindowsDirectory(tmp, sizeof(tmp));
259 strcat(library_path, ";");
260 strcat(library_path, tmp);
261
262 if (path_str) {
263 strcat(library_path, ";");
264 strcat(library_path, path_str);
265 }
266
267 strcat(library_path, ";.");
268
269 Arguments::set_library_path(library_path);
270 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
271 }
272
273 /* Default extensions directory */
274 {
275 char path[MAX_PATH];
276 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
277 GetWindowsDirectory(path, MAX_PATH);
278 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
279 path, PACKAGE_DIR, EXT_DIR);
280 Arguments::set_ext_dirs(buf);
281 }
282 #undef EXT_DIR
283 #undef BIN_DIR
284 #undef PACKAGE_DIR
285
286 /* Default endorsed standards directory. */
287 {
288 #define ENDORSED_DIR "\\lib\\endorsed"
289 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
290 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
291 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
292 Arguments::set_endorsed_dirs(buf);
293 #undef ENDORSED_DIR
294 }
295
296 #ifndef _WIN64
297 // set our UnhandledExceptionFilter and save any previous one
298 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
299 #endif
300
301 // Done
302 return;
303 }
304
305 void os::breakpoint() {
306 DebugBreak();
307 }
308
309 // Invoked from the BREAKPOINT Macro
310 extern "C" void breakpoint() {
311 os::breakpoint();
312 }
313
314 /*
315 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 * So far, this method is only used by Native Memory Tracking, which is
317 * only supported on Windows XP or later.
318 */
319 address os::get_caller_pc(int n) {
320 #ifdef _NMT_NOINLINE_
321 n ++;
322 #endif
323 address pc;
324 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
325 return pc;
326 }
327 return NULL;
328 }
329
330
331 // os::current_stack_base()
332 //
333 // Returns the base of the stack, which is the stack's
334 // starting address. This function must be called
335 // while running on the stack of the thread being queried.
336
337 address os::current_stack_base() {
338 MEMORY_BASIC_INFORMATION minfo;
339 address stack_bottom;
340 size_t stack_size;
341
342 VirtualQuery(&minfo, &minfo, sizeof(minfo));
343 stack_bottom = (address)minfo.AllocationBase;
344 stack_size = minfo.RegionSize;
345
346 // Add up the sizes of all the regions with the same
347 // AllocationBase.
348 while( 1 )
349 {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if ( stack_bottom == (address)minfo.AllocationBase )
352 stack_size += minfo.RegionSize;
353 else
354 break;
355 }
356
357 #ifdef _M_IA64
358 // IA64 has memory and register stacks
359 //
360 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
361 // at thread creation (1MB backing store growing upwards, 1MB memory stack
362 // growing downwards, 2MB summed up)
363 //
364 // ...
365 // ------- top of stack (high address) -----
366 // |
367 // | 1MB
368 // | Backing Store (Register Stack)
369 // |
370 // | / \
371 // | |
372 // | |
373 // | |
374 // ------------------------ stack base -----
375 // | 1MB
376 // | Memory Stack
377 // |
378 // | |
379 // | |
380 // | |
381 // | \ /
382 // |
383 // ----- bottom of stack (low address) -----
384 // ...
385
386 stack_size = stack_size / 2;
387 #endif
388 return stack_bottom + stack_size;
389 }
390
391 size_t os::current_stack_size() {
392 size_t sz;
393 MEMORY_BASIC_INFORMATION minfo;
394 VirtualQuery(&minfo, &minfo, sizeof(minfo));
395 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
396 return sz;
397 }
398
399 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
400 const struct tm* time_struct_ptr = localtime(clock);
401 if (time_struct_ptr != NULL) {
402 *res = *time_struct_ptr;
403 return res;
404 }
405 return NULL;
406 }
407
408 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
409
410 // Thread start routine for all new Java threads
411 static unsigned __stdcall java_start(Thread* thread) {
412 // Try to randomize the cache line index of hot stack frames.
413 // This helps when threads of the same stack traces evict each other's
414 // cache lines. The threads can be either from the same JVM instance, or
415 // from different JVM instances. The benefit is especially true for
416 // processors with hyperthreading technology.
417 static int counter = 0;
418 int pid = os::current_process_id();
419 _alloca(((pid ^ counter++) & 7) * 128);
420
421 OSThread* osthr = thread->osthread();
422 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
423
424 if (UseNUMA) {
425 int lgrp_id = os::numa_get_group_id();
426 if (lgrp_id != -1) {
427 thread->set_lgrp_id(lgrp_id);
428 }
429 }
430
431
432 // Install a win32 structured exception handler around every thread created
433 // by VM, so VM can genrate error dump when an exception occurred in non-
434 // Java thread (e.g. VM thread).
435 __try {
436 thread->run();
437 } __except(topLevelExceptionFilter(
438 (_EXCEPTION_POINTERS*)_exception_info())) {
439 // Nothing to do.
440 }
441
442 // One less thread is executing
443 // When the VMThread gets here, the main thread may have already exited
444 // which frees the CodeHeap containing the Atomic::add code
445 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
446 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
447 }
448
449 return 0;
450 }
451
452 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
453 // Allocate the OSThread object
454 OSThread* osthread = new OSThread(NULL, NULL);
455 if (osthread == NULL) return NULL;
456
457 // Initialize support for Java interrupts
458 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
459 if (interrupt_event == NULL) {
460 delete osthread;
461 return NULL;
462 }
463 osthread->set_interrupt_event(interrupt_event);
464
465 // Store info on the Win32 thread into the OSThread
466 osthread->set_thread_handle(thread_handle);
467 osthread->set_thread_id(thread_id);
468
469 if (UseNUMA) {
470 int lgrp_id = os::numa_get_group_id();
471 if (lgrp_id != -1) {
472 thread->set_lgrp_id(lgrp_id);
473 }
474 }
475
476 // Initial thread state is INITIALIZED, not SUSPENDED
477 osthread->set_state(INITIALIZED);
478
479 return osthread;
480 }
481
482
483 bool os::create_attached_thread(JavaThread* thread) {
484 #ifdef ASSERT
485 thread->verify_not_published();
486 #endif
487 HANDLE thread_h;
488 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
489 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
490 fatal("DuplicateHandle failed\n");
491 }
492 OSThread* osthread = create_os_thread(thread, thread_h,
493 (int)current_thread_id());
494 if (osthread == NULL) {
495 return false;
496 }
497
498 // Initial thread state is RUNNABLE
499 osthread->set_state(RUNNABLE);
500
501 thread->set_osthread(osthread);
502 return true;
503 }
504
505 bool os::create_main_thread(JavaThread* thread) {
506 #ifdef ASSERT
507 thread->verify_not_published();
508 #endif
509 if (_starting_thread == NULL) {
510 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
511 if (_starting_thread == NULL) {
512 return false;
513 }
514 }
515
516 // The primordial thread is runnable from the start)
517 _starting_thread->set_state(RUNNABLE);
518
519 thread->set_osthread(_starting_thread);
520 return true;
521 }
522
523 // Allocate and initialize a new OSThread
524 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
525 unsigned thread_id;
526
527 // Allocate the OSThread object
528 OSThread* osthread = new OSThread(NULL, NULL);
529 if (osthread == NULL) {
530 return false;
531 }
532
533 // Initialize support for Java interrupts
534 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
535 if (interrupt_event == NULL) {
536 delete osthread;
537 return NULL;
538 }
539 osthread->set_interrupt_event(interrupt_event);
540 osthread->set_interrupted(false);
541
542 thread->set_osthread(osthread);
543
544 if (stack_size == 0) {
545 switch (thr_type) {
546 case os::java_thread:
547 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
548 if (JavaThread::stack_size_at_create() > 0)
549 stack_size = JavaThread::stack_size_at_create();
550 break;
551 case os::compiler_thread:
552 if (CompilerThreadStackSize > 0) {
553 stack_size = (size_t)(CompilerThreadStackSize * K);
554 break;
555 } // else fall through:
556 // use VMThreadStackSize if CompilerThreadStackSize is not defined
557 case os::vm_thread:
558 case os::pgc_thread:
559 case os::cgc_thread:
560 case os::watcher_thread:
561 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
562 break;
563 }
564 }
565
566 // Create the Win32 thread
567 //
568 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
569 // does not specify stack size. Instead, it specifies the size of
570 // initially committed space. The stack size is determined by
571 // PE header in the executable. If the committed "stack_size" is larger
572 // than default value in the PE header, the stack is rounded up to the
573 // nearest multiple of 1MB. For example if the launcher has default
574 // stack size of 320k, specifying any size less than 320k does not
575 // affect the actual stack size at all, it only affects the initial
576 // commitment. On the other hand, specifying 'stack_size' larger than
577 // default value may cause significant increase in memory usage, because
578 // not only the stack space will be rounded up to MB, but also the
579 // entire space is committed upfront.
580 //
581 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
582 // for CreateThread() that can treat 'stack_size' as stack size. However we
583 // are not supposed to call CreateThread() directly according to MSDN
584 // document because JVM uses C runtime library. The good news is that the
585 // flag appears to work with _beginthredex() as well.
586
587 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
588 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
589 #endif
590
591 HANDLE thread_handle =
592 (HANDLE)_beginthreadex(NULL,
593 (unsigned)stack_size,
594 (unsigned (__stdcall *)(void*)) java_start,
595 thread,
596 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
597 &thread_id);
598 if (thread_handle == NULL) {
599 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
600 // without the flag.
601 thread_handle =
602 (HANDLE)_beginthreadex(NULL,
603 (unsigned)stack_size,
604 (unsigned (__stdcall *)(void*)) java_start,
605 thread,
606 CREATE_SUSPENDED,
607 &thread_id);
608 }
609 if (thread_handle == NULL) {
610 // Need to clean up stuff we've allocated so far
611 CloseHandle(osthread->interrupt_event());
612 thread->set_osthread(NULL);
613 delete osthread;
614 return NULL;
615 }
616
617 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
618
619 // Store info on the Win32 thread into the OSThread
620 osthread->set_thread_handle(thread_handle);
621 osthread->set_thread_id(thread_id);
622
623 // Initial thread state is INITIALIZED, not SUSPENDED
624 osthread->set_state(INITIALIZED);
625
626 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
627 return true;
628 }
629
630
631 // Free Win32 resources related to the OSThread
632 void os::free_thread(OSThread* osthread) {
633 assert(osthread != NULL, "osthread not set");
634 CloseHandle(osthread->thread_handle());
635 CloseHandle(osthread->interrupt_event());
636 delete osthread;
637 }
638
639 static jlong first_filetime;
640 static jlong initial_performance_count;
641 static jlong performance_frequency;
642
643
644 jlong as_long(LARGE_INTEGER x) {
645 jlong result = 0; // initialization to avoid warning
646 set_high(&result, x.HighPart);
647 set_low(&result, x.LowPart);
648 return result;
649 }
650
651
652 jlong os::elapsed_counter() {
653 LARGE_INTEGER count;
654 if (win32::_has_performance_count) {
655 QueryPerformanceCounter(&count);
656 return as_long(count) - initial_performance_count;
657 } else {
658 FILETIME wt;
659 GetSystemTimeAsFileTime(&wt);
660 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
661 }
662 }
663
664
665 jlong os::elapsed_frequency() {
666 if (win32::_has_performance_count) {
667 return performance_frequency;
668 } else {
669 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
670 return 10000000;
671 }
672 }
673
674
675 julong os::available_memory() {
676 return win32::available_memory();
677 }
678
679 julong os::win32::available_memory() {
680 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
681 // value if total memory is larger than 4GB
682 MEMORYSTATUSEX ms;
683 ms.dwLength = sizeof(ms);
684 GlobalMemoryStatusEx(&ms);
685
686 return (julong)ms.ullAvailPhys;
687 }
688
689 julong os::physical_memory() {
690 return win32::physical_memory();
691 }
692
693 bool os::has_allocatable_memory_limit(julong* limit) {
694 MEMORYSTATUSEX ms;
695 ms.dwLength = sizeof(ms);
696 GlobalMemoryStatusEx(&ms);
697 #ifdef _LP64
698 *limit = (julong)ms.ullAvailVirtual;
699 return true;
700 #else
701 // Limit to 1400m because of the 2gb address space wall
702 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
703 return true;
704 #endif
705 }
706
707 // VC6 lacks DWORD_PTR
708 #if _MSC_VER < 1300
709 typedef UINT_PTR DWORD_PTR;
710 #endif
711
712 int os::active_processor_count() {
713 DWORD_PTR lpProcessAffinityMask = 0;
714 DWORD_PTR lpSystemAffinityMask = 0;
715 int proc_count = processor_count();
716 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
717 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
718 // Nof active processors is number of bits in process affinity mask
719 int bitcount = 0;
720 while (lpProcessAffinityMask != 0) {
721 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
722 bitcount++;
723 }
724 return bitcount;
725 } else {
726 return proc_count;
727 }
728 }
729
730 void os::set_native_thread_name(const char *name) {
731 // Not yet implemented.
732 return;
733 }
734
735 bool os::distribute_processes(uint length, uint* distribution) {
736 // Not yet implemented.
737 return false;
738 }
739
740 bool os::bind_to_processor(uint processor_id) {
741 // Not yet implemented.
742 return false;
743 }
744
745 void os::win32::initialize_performance_counter() {
746 LARGE_INTEGER count;
747 if (QueryPerformanceFrequency(&count)) {
748 win32::_has_performance_count = 1;
749 performance_frequency = as_long(count);
750 QueryPerformanceCounter(&count);
751 initial_performance_count = as_long(count);
752 } else {
753 win32::_has_performance_count = 0;
754 FILETIME wt;
755 GetSystemTimeAsFileTime(&wt);
756 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
757 }
758 }
759
760
761 double os::elapsedTime() {
762 return (double) elapsed_counter() / (double) elapsed_frequency();
763 }
764
765
766 // Windows format:
767 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
768 // Java format:
769 // Java standards require the number of milliseconds since 1/1/1970
770
771 // Constant offset - calculated using offset()
772 static jlong _offset = 116444736000000000;
773 // Fake time counter for reproducible results when debugging
774 static jlong fake_time = 0;
775
776 #ifdef ASSERT
777 // Just to be safe, recalculate the offset in debug mode
778 static jlong _calculated_offset = 0;
779 static int _has_calculated_offset = 0;
780
781 jlong offset() {
782 if (_has_calculated_offset) return _calculated_offset;
783 SYSTEMTIME java_origin;
784 java_origin.wYear = 1970;
785 java_origin.wMonth = 1;
786 java_origin.wDayOfWeek = 0; // ignored
787 java_origin.wDay = 1;
788 java_origin.wHour = 0;
789 java_origin.wMinute = 0;
790 java_origin.wSecond = 0;
791 java_origin.wMilliseconds = 0;
792 FILETIME jot;
793 if (!SystemTimeToFileTime(&java_origin, &jot)) {
794 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
795 }
796 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
797 _has_calculated_offset = 1;
798 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
799 return _calculated_offset;
800 }
801 #else
802 jlong offset() {
803 return _offset;
804 }
805 #endif
806
807 jlong windows_to_java_time(FILETIME wt) {
808 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
809 return (a - offset()) / 10000;
810 }
811
812 FILETIME java_to_windows_time(jlong l) {
813 jlong a = (l * 10000) + offset();
814 FILETIME result;
815 result.dwHighDateTime = high(a);
816 result.dwLowDateTime = low(a);
817 return result;
818 }
819
820 bool os::supports_vtime() { return true; }
821 bool os::enable_vtime() { return false; }
822 bool os::vtime_enabled() { return false; }
823
824 double os::elapsedVTime() {
825 FILETIME created;
826 FILETIME exited;
827 FILETIME kernel;
828 FILETIME user;
829 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
830 // the resolution of windows_to_java_time() should be sufficient (ms)
831 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
832 } else {
833 return elapsedTime();
834 }
835 }
836
837 jlong os::javaTimeMillis() {
838 if (UseFakeTimers) {
839 return fake_time++;
840 } else {
841 FILETIME wt;
842 GetSystemTimeAsFileTime(&wt);
843 return windows_to_java_time(wt);
844 }
845 }
846
847 jlong os::javaTimeNanos() {
848 if (!win32::_has_performance_count) {
849 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
850 } else {
851 LARGE_INTEGER current_count;
852 QueryPerformanceCounter(¤t_count);
853 double current = as_long(current_count);
854 double freq = performance_frequency;
855 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
856 return time;
857 }
858 }
859
860 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
861 if (!win32::_has_performance_count) {
862 // javaTimeMillis() doesn't have much percision,
863 // but it is not going to wrap -- so all 64 bits
864 info_ptr->max_value = ALL_64_BITS;
865
866 // this is a wall clock timer, so may skip
867 info_ptr->may_skip_backward = true;
868 info_ptr->may_skip_forward = true;
869 } else {
870 jlong freq = performance_frequency;
871 if (freq < NANOSECS_PER_SEC) {
872 // the performance counter is 64 bits and we will
873 // be multiplying it -- so no wrap in 64 bits
874 info_ptr->max_value = ALL_64_BITS;
875 } else if (freq > NANOSECS_PER_SEC) {
876 // use the max value the counter can reach to
877 // determine the max value which could be returned
878 julong max_counter = (julong)ALL_64_BITS;
879 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
880 } else {
881 // the performance counter is 64 bits and we will
882 // be using it directly -- so no wrap in 64 bits
883 info_ptr->max_value = ALL_64_BITS;
884 }
885
886 // using a counter, so no skipping
887 info_ptr->may_skip_backward = false;
888 info_ptr->may_skip_forward = false;
889 }
890 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
891 }
892
893 char* os::local_time_string(char *buf, size_t buflen) {
894 SYSTEMTIME st;
895 GetLocalTime(&st);
896 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
897 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
898 return buf;
899 }
900
901 bool os::getTimesSecs(double* process_real_time,
902 double* process_user_time,
903 double* process_system_time) {
904 HANDLE h_process = GetCurrentProcess();
905 FILETIME create_time, exit_time, kernel_time, user_time;
906 BOOL result = GetProcessTimes(h_process,
907 &create_time,
908 &exit_time,
909 &kernel_time,
910 &user_time);
911 if (result != 0) {
912 FILETIME wt;
913 GetSystemTimeAsFileTime(&wt);
914 jlong rtc_millis = windows_to_java_time(wt);
915 jlong user_millis = windows_to_java_time(user_time);
916 jlong system_millis = windows_to_java_time(kernel_time);
917 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
918 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
919 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
920 return true;
921 } else {
922 return false;
923 }
924 }
925
926 void os::shutdown() {
927
928 // allow PerfMemory to attempt cleanup of any persistent resources
929 perfMemory_exit();
930
931 // flush buffered output, finish log files
932 ostream_abort();
933
934 // Check for abort hook
935 abort_hook_t abort_hook = Arguments::abort_hook();
936 if (abort_hook != NULL) {
937 abort_hook();
938 }
939 }
940
941
942 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
943 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
944
945 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
946 HINSTANCE dbghelp;
947 EXCEPTION_POINTERS ep;
948 MINIDUMP_EXCEPTION_INFORMATION mei;
949 MINIDUMP_EXCEPTION_INFORMATION* pmei;
950
951 HANDLE hProcess = GetCurrentProcess();
952 DWORD processId = GetCurrentProcessId();
953 HANDLE dumpFile;
954 MINIDUMP_TYPE dumpType;
955 static const char* cwd;
956
957 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
958 #ifndef ASSERT
959 // If running on a client version of Windows and user has not explicitly enabled dumping
960 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
961 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
962 return;
963 // If running on a server version of Windows and user has explictly disabled dumping
964 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
965 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
966 return;
967 }
968 #else
969 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
970 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
971 return;
972 }
973 #endif
974
975 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
976
977 if (dbghelp == NULL) {
978 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
979 return;
980 }
981
982 _MiniDumpWriteDump = CAST_TO_FN_PTR(
983 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
984 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
985 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
986
987 if (_MiniDumpWriteDump == NULL) {
988 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
989 return;
990 }
991
992 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
993
994 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
995 // API_VERSION_NUMBER 11 or higher contains the ones we want though
996 #if API_VERSION_NUMBER >= 11
997 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
998 MiniDumpWithUnloadedModules);
999 #endif
1000
1001 cwd = get_current_directory(NULL, 0);
1002 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1003 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1004
1005 if (dumpFile == INVALID_HANDLE_VALUE) {
1006 VMError::report_coredump_status("Failed to create file for dumping", false);
1007 return;
1008 }
1009 if (exceptionRecord != NULL && contextRecord != NULL) {
1010 ep.ContextRecord = (PCONTEXT) contextRecord;
1011 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1012
1013 mei.ThreadId = GetCurrentThreadId();
1014 mei.ExceptionPointers = &ep;
1015 pmei = &mei;
1016 } else {
1017 pmei = NULL;
1018 }
1019
1020
1021 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1022 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1023 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1024 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1025 DWORD error = GetLastError();
1026 LPTSTR msgbuf = NULL;
1027
1028 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1029 FORMAT_MESSAGE_FROM_SYSTEM |
1030 FORMAT_MESSAGE_IGNORE_INSERTS,
1031 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1032
1033 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1034 LocalFree(msgbuf);
1035 } else {
1036 // Call to FormatMessage failed, just include the result from GetLastError
1037 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1038 }
1039 VMError::report_coredump_status(buffer, false);
1040 } else {
1041 VMError::report_coredump_status(buffer, true);
1042 }
1043
1044 CloseHandle(dumpFile);
1045 }
1046
1047
1048
1049 void os::abort(bool dump_core)
1050 {
1051 os::shutdown();
1052 // no core dump on Windows
1053 ::exit(1);
1054 }
1055
1056 // Die immediately, no exit hook, no abort hook, no cleanup.
1057 void os::die() {
1058 _exit(-1);
1059 }
1060
1061 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1062 // * dirent_md.c 1.15 00/02/02
1063 //
1064 // The declarations for DIR and struct dirent are in jvm_win32.h.
1065
1066 /* Caller must have already run dirname through JVM_NativePath, which removes
1067 duplicate slashes and converts all instances of '/' into '\\'. */
1068
1069 DIR *
1070 os::opendir(const char *dirname)
1071 {
1072 assert(dirname != NULL, "just checking"); // hotspot change
1073 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1074 DWORD fattr; // hotspot change
1075 char alt_dirname[4] = { 0, 0, 0, 0 };
1076
1077 if (dirp == 0) {
1078 errno = ENOMEM;
1079 return 0;
1080 }
1081
1082 /*
1083 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1084 * as a directory in FindFirstFile(). We detect this case here and
1085 * prepend the current drive name.
1086 */
1087 if (dirname[1] == '\0' && dirname[0] == '\\') {
1088 alt_dirname[0] = _getdrive() + 'A' - 1;
1089 alt_dirname[1] = ':';
1090 alt_dirname[2] = '\\';
1091 alt_dirname[3] = '\0';
1092 dirname = alt_dirname;
1093 }
1094
1095 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1096 if (dirp->path == 0) {
1097 free(dirp, mtInternal);
1098 errno = ENOMEM;
1099 return 0;
1100 }
1101 strcpy(dirp->path, dirname);
1102
1103 fattr = GetFileAttributes(dirp->path);
1104 if (fattr == 0xffffffff) {
1105 free(dirp->path, mtInternal);
1106 free(dirp, mtInternal);
1107 errno = ENOENT;
1108 return 0;
1109 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1110 free(dirp->path, mtInternal);
1111 free(dirp, mtInternal);
1112 errno = ENOTDIR;
1113 return 0;
1114 }
1115
1116 /* Append "*.*", or possibly "\\*.*", to path */
1117 if (dirp->path[1] == ':'
1118 && (dirp->path[2] == '\0'
1119 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1120 /* No '\\' needed for cases like "Z:" or "Z:\" */
1121 strcat(dirp->path, "*.*");
1122 } else {
1123 strcat(dirp->path, "\\*.*");
1124 }
1125
1126 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1127 if (dirp->handle == INVALID_HANDLE_VALUE) {
1128 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1129 free(dirp->path, mtInternal);
1130 free(dirp, mtInternal);
1131 errno = EACCES;
1132 return 0;
1133 }
1134 }
1135 return dirp;
1136 }
1137
1138 /* parameter dbuf unused on Windows */
1139
1140 struct dirent *
1141 os::readdir(DIR *dirp, dirent *dbuf)
1142 {
1143 assert(dirp != NULL, "just checking"); // hotspot change
1144 if (dirp->handle == INVALID_HANDLE_VALUE) {
1145 return 0;
1146 }
1147
1148 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1149
1150 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1151 if (GetLastError() == ERROR_INVALID_HANDLE) {
1152 errno = EBADF;
1153 return 0;
1154 }
1155 FindClose(dirp->handle);
1156 dirp->handle = INVALID_HANDLE_VALUE;
1157 }
1158
1159 return &dirp->dirent;
1160 }
1161
1162 int
1163 os::closedir(DIR *dirp)
1164 {
1165 assert(dirp != NULL, "just checking"); // hotspot change
1166 if (dirp->handle != INVALID_HANDLE_VALUE) {
1167 if (!FindClose(dirp->handle)) {
1168 errno = EBADF;
1169 return -1;
1170 }
1171 dirp->handle = INVALID_HANDLE_VALUE;
1172 }
1173 free(dirp->path, mtInternal);
1174 free(dirp, mtInternal);
1175 return 0;
1176 }
1177
1178 // This must be hard coded because it's the system's temporary
1179 // directory not the java application's temp directory, ala java.io.tmpdir.
1180 const char* os::get_temp_directory() {
1181 static char path_buf[MAX_PATH];
1182 if (GetTempPath(MAX_PATH, path_buf)>0)
1183 return path_buf;
1184 else{
1185 path_buf[0]='\0';
1186 return path_buf;
1187 }
1188 }
1189
1190 static bool file_exists(const char* filename) {
1191 if (filename == NULL || strlen(filename) == 0) {
1192 return false;
1193 }
1194 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1195 }
1196
1197 bool os::dll_build_name(char *buffer, size_t buflen,
1198 const char* pname, const char* fname) {
1199 bool retval = false;
1200 const size_t pnamelen = pname ? strlen(pname) : 0;
1201 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1202
1203 // Return error on buffer overflow.
1204 if (pnamelen + strlen(fname) + 10 > buflen) {
1205 return retval;
1206 }
1207
1208 if (pnamelen == 0) {
1209 jio_snprintf(buffer, buflen, "%s.dll", fname);
1210 retval = true;
1211 } else if (c == ':' || c == '\\') {
1212 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1213 retval = true;
1214 } else if (strchr(pname, *os::path_separator()) != NULL) {
1215 int n;
1216 char** pelements = split_path(pname, &n);
1217 if (pelements == NULL) {
1218 return false;
1219 }
1220 for (int i = 0 ; i < n ; i++) {
1221 char* path = pelements[i];
1222 // Really shouldn't be NULL, but check can't hurt
1223 size_t plen = (path == NULL) ? 0 : strlen(path);
1224 if (plen == 0) {
1225 continue; // skip the empty path values
1226 }
1227 const char lastchar = path[plen - 1];
1228 if (lastchar == ':' || lastchar == '\\') {
1229 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1230 } else {
1231 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1232 }
1233 if (file_exists(buffer)) {
1234 retval = true;
1235 break;
1236 }
1237 }
1238 // release the storage
1239 for (int i = 0 ; i < n ; i++) {
1240 if (pelements[i] != NULL) {
1241 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1242 }
1243 }
1244 if (pelements != NULL) {
1245 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1246 }
1247 } else {
1248 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1249 retval = true;
1250 }
1251 return retval;
1252 }
1253
1254 // Needs to be in os specific directory because windows requires another
1255 // header file <direct.h>
1256 const char* os::get_current_directory(char *buf, size_t buflen) {
1257 int n = static_cast<int>(buflen);
1258 if (buflen > INT_MAX) n = INT_MAX;
1259 return _getcwd(buf, n);
1260 }
1261
1262 //-----------------------------------------------------------
1263 // Helper functions for fatal error handler
1264 #ifdef _WIN64
1265 // Helper routine which returns true if address in
1266 // within the NTDLL address space.
1267 //
1268 static bool _addr_in_ntdll( address addr )
1269 {
1270 HMODULE hmod;
1271 MODULEINFO minfo;
1272
1273 hmod = GetModuleHandle("NTDLL.DLL");
1274 if ( hmod == NULL ) return false;
1275 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1276 &minfo, sizeof(MODULEINFO)) )
1277 return false;
1278
1279 if ( (addr >= minfo.lpBaseOfDll) &&
1280 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1281 return true;
1282 else
1283 return false;
1284 }
1285 #endif
1286
1287
1288 // Enumerate all modules for a given process ID
1289 //
1290 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1291 // different API for doing this. We use PSAPI.DLL on NT based
1292 // Windows and ToolHelp on 95/98/Me.
1293
1294 // Callback function that is called by enumerate_modules() on
1295 // every DLL module.
1296 // Input parameters:
1297 // int pid,
1298 // char* module_file_name,
1299 // address module_base_addr,
1300 // unsigned module_size,
1301 // void* param
1302 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1303
1304 // enumerate_modules for Windows NT, using PSAPI
1305 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1306 {
1307 HANDLE hProcess ;
1308
1309 # define MAX_NUM_MODULES 128
1310 HMODULE modules[MAX_NUM_MODULES];
1311 static char filename[ MAX_PATH ];
1312 int result = 0;
1313
1314 if (!os::PSApiDll::PSApiAvailable()) {
1315 return 0;
1316 }
1317
1318 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1319 FALSE, pid ) ;
1320 if (hProcess == NULL) return 0;
1321
1322 DWORD size_needed;
1323 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1324 sizeof(modules), &size_needed)) {
1325 CloseHandle( hProcess );
1326 return 0;
1327 }
1328
1329 // number of modules that are currently loaded
1330 int num_modules = size_needed / sizeof(HMODULE);
1331
1332 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1333 // Get Full pathname:
1334 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1335 filename, sizeof(filename))) {
1336 filename[0] = '\0';
1337 }
1338
1339 MODULEINFO modinfo;
1340 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1341 &modinfo, sizeof(modinfo))) {
1342 modinfo.lpBaseOfDll = NULL;
1343 modinfo.SizeOfImage = 0;
1344 }
1345
1346 // Invoke callback function
1347 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1348 modinfo.SizeOfImage, param);
1349 if (result) break;
1350 }
1351
1352 CloseHandle( hProcess ) ;
1353 return result;
1354 }
1355
1356
1357 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1358 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1359 {
1360 HANDLE hSnapShot ;
1361 static MODULEENTRY32 modentry ;
1362 int result = 0;
1363
1364 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1365 return 0;
1366 }
1367
1368 // Get a handle to a Toolhelp snapshot of the system
1369 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1370 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1371 return FALSE ;
1372 }
1373
1374 // iterate through all modules
1375 modentry.dwSize = sizeof(MODULEENTRY32) ;
1376 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1377
1378 while( not_done ) {
1379 // invoke the callback
1380 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1381 modentry.modBaseSize, param);
1382 if (result) break;
1383
1384 modentry.dwSize = sizeof(MODULEENTRY32) ;
1385 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1386 }
1387
1388 CloseHandle(hSnapShot);
1389 return result;
1390 }
1391
1392 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1393 {
1394 // Get current process ID if caller doesn't provide it.
1395 if (!pid) pid = os::current_process_id();
1396
1397 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1398 else return _enumerate_modules_windows(pid, func, param);
1399 }
1400
1401 struct _modinfo {
1402 address addr;
1403 char* full_path; // point to a char buffer
1404 int buflen; // size of the buffer
1405 address base_addr;
1406 };
1407
1408 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1409 unsigned size, void * param) {
1410 struct _modinfo *pmod = (struct _modinfo *)param;
1411 if (!pmod) return -1;
1412
1413 if (base_addr <= pmod->addr &&
1414 base_addr+size > pmod->addr) {
1415 // if a buffer is provided, copy path name to the buffer
1416 if (pmod->full_path) {
1417 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1418 }
1419 pmod->base_addr = base_addr;
1420 return 1;
1421 }
1422 return 0;
1423 }
1424
1425 bool os::dll_address_to_library_name(address addr, char* buf,
1426 int buflen, int* offset) {
1427 // buf is not optional, but offset is optional
1428 assert(buf != NULL, "sanity check");
1429
1430 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1431 // return the full path to the DLL file, sometimes it returns path
1432 // to the corresponding PDB file (debug info); sometimes it only
1433 // returns partial path, which makes life painful.
1434
1435 struct _modinfo mi;
1436 mi.addr = addr;
1437 mi.full_path = buf;
1438 mi.buflen = buflen;
1439 int pid = os::current_process_id();
1440 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1441 // buf already contains path name
1442 if (offset) *offset = addr - mi.base_addr;
1443 return true;
1444 }
1445
1446 buf[0] = '\0';
1447 if (offset) *offset = -1;
1448 return false;
1449 }
1450
1451 bool os::dll_address_to_function_name(address addr, char *buf,
1452 int buflen, int *offset) {
1453 // buf is not optional, but offset is optional
1454 assert(buf != NULL, "sanity check");
1455
1456 if (Decoder::decode(addr, buf, buflen, offset)) {
1457 return true;
1458 }
1459 if (offset != NULL) *offset = -1;
1460 buf[0] = '\0';
1461 return false;
1462 }
1463
1464 // save the start and end address of jvm.dll into param[0] and param[1]
1465 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1466 unsigned size, void * param) {
1467 if (!param) return -1;
1468
1469 if (base_addr <= (address)_locate_jvm_dll &&
1470 base_addr+size > (address)_locate_jvm_dll) {
1471 ((address*)param)[0] = base_addr;
1472 ((address*)param)[1] = base_addr + size;
1473 return 1;
1474 }
1475 return 0;
1476 }
1477
1478 address vm_lib_location[2]; // start and end address of jvm.dll
1479
1480 // check if addr is inside jvm.dll
1481 bool os::address_is_in_vm(address addr) {
1482 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1483 int pid = os::current_process_id();
1484 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1485 assert(false, "Can't find jvm module.");
1486 return false;
1487 }
1488 }
1489
1490 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1491 }
1492
1493 // print module info; param is outputStream*
1494 static int _print_module(int pid, char* fname, address base,
1495 unsigned size, void* param) {
1496 if (!param) return -1;
1497
1498 outputStream* st = (outputStream*)param;
1499
1500 address end_addr = base + size;
1501 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1502 return 0;
1503 }
1504
1505 // Loads .dll/.so and
1506 // in case of error it checks if .dll/.so was built for the
1507 // same architecture as Hotspot is running on
1508 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1509 {
1510 void * result = LoadLibrary(name);
1511 if (result != NULL)
1512 {
1513 return result;
1514 }
1515
1516 DWORD errcode = GetLastError();
1517 if (errcode == ERROR_MOD_NOT_FOUND) {
1518 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1519 ebuf[ebuflen-1]='\0';
1520 return NULL;
1521 }
1522
1523 // Parsing dll below
1524 // If we can read dll-info and find that dll was built
1525 // for an architecture other than Hotspot is running in
1526 // - then print to buffer "DLL was built for a different architecture"
1527 // else call os::lasterror to obtain system error message
1528
1529 // Read system error message into ebuf
1530 // It may or may not be overwritten below (in the for loop and just above)
1531 lasterror(ebuf, (size_t) ebuflen);
1532 ebuf[ebuflen-1]='\0';
1533 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1534 if (file_descriptor<0)
1535 {
1536 return NULL;
1537 }
1538
1539 uint32_t signature_offset;
1540 uint16_t lib_arch=0;
1541 bool failed_to_get_lib_arch=
1542 (
1543 //Go to position 3c in the dll
1544 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1545 ||
1546 // Read loacation of signature
1547 (sizeof(signature_offset)!=
1548 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1549 ||
1550 //Go to COFF File Header in dll
1551 //that is located after"signature" (4 bytes long)
1552 (os::seek_to_file_offset(file_descriptor,
1553 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1554 ||
1555 //Read field that contains code of architecture
1556 // that dll was build for
1557 (sizeof(lib_arch)!=
1558 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1559 );
1560
1561 ::close(file_descriptor);
1562 if (failed_to_get_lib_arch)
1563 {
1564 // file i/o error - report os::lasterror(...) msg
1565 return NULL;
1566 }
1567
1568 typedef struct
1569 {
1570 uint16_t arch_code;
1571 char* arch_name;
1572 } arch_t;
1573
1574 static const arch_t arch_array[]={
1575 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1576 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1577 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1578 };
1579 #if (defined _M_IA64)
1580 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1581 #elif (defined _M_AMD64)
1582 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1583 #elif (defined _M_IX86)
1584 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1585 #else
1586 #error Method os::dll_load requires that one of following \
1587 is defined :_M_IA64,_M_AMD64 or _M_IX86
1588 #endif
1589
1590
1591 // Obtain a string for printf operation
1592 // lib_arch_str shall contain string what platform this .dll was built for
1593 // running_arch_str shall string contain what platform Hotspot was built for
1594 char *running_arch_str=NULL,*lib_arch_str=NULL;
1595 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1596 {
1597 if (lib_arch==arch_array[i].arch_code)
1598 lib_arch_str=arch_array[i].arch_name;
1599 if (running_arch==arch_array[i].arch_code)
1600 running_arch_str=arch_array[i].arch_name;
1601 }
1602
1603 assert(running_arch_str,
1604 "Didn't find runing architecture code in arch_array");
1605
1606 // If the architure is right
1607 // but some other error took place - report os::lasterror(...) msg
1608 if (lib_arch == running_arch)
1609 {
1610 return NULL;
1611 }
1612
1613 if (lib_arch_str!=NULL)
1614 {
1615 ::_snprintf(ebuf, ebuflen-1,
1616 "Can't load %s-bit .dll on a %s-bit platform",
1617 lib_arch_str,running_arch_str);
1618 }
1619 else
1620 {
1621 // don't know what architecture this dll was build for
1622 ::_snprintf(ebuf, ebuflen-1,
1623 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1624 lib_arch,running_arch_str);
1625 }
1626
1627 return NULL;
1628 }
1629
1630
1631 void os::print_dll_info(outputStream *st) {
1632 int pid = os::current_process_id();
1633 st->print_cr("Dynamic libraries:");
1634 enumerate_modules(pid, _print_module, (void *)st);
1635 }
1636
1637 void os::print_os_info_brief(outputStream* st) {
1638 os::print_os_info(st);
1639 }
1640
1641 void os::print_os_info(outputStream* st) {
1642 st->print("OS:");
1643
1644 os::win32::print_windows_version(st);
1645 }
1646
1647 void os::win32::print_windows_version(outputStream* st) {
1648 OSVERSIONINFOEX osvi;
1649 SYSTEM_INFO si;
1650
1651 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1652 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1653
1654 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1655 st->print_cr("N/A");
1656 return;
1657 }
1658
1659 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1660
1661 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1662 if (os_vers >= 5002) {
1663 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1664 // find out whether we are running on 64 bit processor or not.
1665 if (os::Kernel32Dll::GetNativeSystemInfoAvailable()) {
1666 os::Kernel32Dll::GetNativeSystemInfo(&si);
1667 } else {
1668 GetSystemInfo(&si);
1669 }
1670 }
1671
1672 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1673 switch (os_vers) {
1674 case 3051: st->print(" Windows NT 3.51"); break;
1675 case 4000: st->print(" Windows NT 4.0"); break;
1676 case 5000: st->print(" Windows 2000"); break;
1677 case 5001: st->print(" Windows XP"); break;
1678 case 5002:
1679 if (osvi.wProductType == VER_NT_WORKSTATION &&
1680 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1681 st->print(" Windows XP x64 Edition");
1682 } else {
1683 st->print(" Windows Server 2003 family");
1684 }
1685 break;
1686
1687 case 6000:
1688 if (osvi.wProductType == VER_NT_WORKSTATION) {
1689 st->print(" Windows Vista");
1690 } else {
1691 st->print(" Windows Server 2008");
1692 }
1693 break;
1694
1695 case 6001:
1696 if (osvi.wProductType == VER_NT_WORKSTATION) {
1697 st->print(" Windows 7");
1698 } else {
1699 st->print(" Windows Server 2008 R2");
1700 }
1701 break;
1702
1703 case 6002:
1704 if (osvi.wProductType == VER_NT_WORKSTATION) {
1705 st->print(" Windows 8");
1706 } else {
1707 st->print(" Windows Server 2012");
1708 }
1709 break;
1710
1711 case 6003:
1712 if (osvi.wProductType == VER_NT_WORKSTATION) {
1713 st->print(" Windows 8.1");
1714 } else {
1715 st->print(" Windows Server 2012 R2");
1716 }
1717 break;
1718
1719 default: // future os
1720 // Unrecognized windows, print out its major and minor versions
1721 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1722 }
1723 } else {
1724 switch (os_vers) {
1725 case 4000: st->print(" Windows 95"); break;
1726 case 4010: st->print(" Windows 98"); break;
1727 case 4090: st->print(" Windows Me"); break;
1728 default: // future windows, print out its major and minor versions
1729 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1730 }
1731 }
1732
1733 if (os_vers >= 6000 && si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1734 st->print(" , 64 bit");
1735 }
1736
1737 st->print(" Build %d", osvi.dwBuildNumber);
1738 st->print(" %s", osvi.szCSDVersion); // service pack
1739 st->cr();
1740 }
1741
1742 void os::pd_print_cpu_info(outputStream* st) {
1743 // Nothing to do for now.
1744 }
1745
1746 void os::print_memory_info(outputStream* st) {
1747 st->print("Memory:");
1748 st->print(" %dk page", os::vm_page_size()>>10);
1749
1750 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1751 // value if total memory is larger than 4GB
1752 MEMORYSTATUSEX ms;
1753 ms.dwLength = sizeof(ms);
1754 GlobalMemoryStatusEx(&ms);
1755
1756 st->print(", physical %uk", os::physical_memory() >> 10);
1757 st->print("(%uk free)", os::available_memory() >> 10);
1758
1759 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1760 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1761 st->cr();
1762 }
1763
1764 void os::print_siginfo(outputStream *st, void *siginfo) {
1765 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1766 st->print("siginfo:");
1767 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1768
1769 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1770 er->NumberParameters >= 2) {
1771 switch (er->ExceptionInformation[0]) {
1772 case 0: st->print(", reading address"); break;
1773 case 1: st->print(", writing address"); break;
1774 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1775 er->ExceptionInformation[0]);
1776 }
1777 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1778 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1779 er->NumberParameters >= 2 && UseSharedSpaces) {
1780 FileMapInfo* mapinfo = FileMapInfo::current_info();
1781 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1782 st->print("\n\nError accessing class data sharing archive." \
1783 " Mapped file inaccessible during execution, " \
1784 " possible disk/network problem.");
1785 }
1786 } else {
1787 int num = er->NumberParameters;
1788 if (num > 0) {
1789 st->print(", ExceptionInformation=");
1790 for (int i = 0; i < num; i++) {
1791 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1792 }
1793 }
1794 }
1795 st->cr();
1796 }
1797
1798 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1799 // do nothing
1800 }
1801
1802 static char saved_jvm_path[MAX_PATH] = {0};
1803
1804 // Find the full path to the current module, jvm.dll
1805 void os::jvm_path(char *buf, jint buflen) {
1806 // Error checking.
1807 if (buflen < MAX_PATH) {
1808 assert(false, "must use a large-enough buffer");
1809 buf[0] = '\0';
1810 return;
1811 }
1812 // Lazy resolve the path to current module.
1813 if (saved_jvm_path[0] != 0) {
1814 strcpy(buf, saved_jvm_path);
1815 return;
1816 }
1817
1818 buf[0] = '\0';
1819 if (Arguments::sun_java_launcher_is_altjvm()) {
1820 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1821 // for a JAVA_HOME environment variable and fix up the path so it
1822 // looks like jvm.dll is installed there (append a fake suffix
1823 // hotspot/jvm.dll).
1824 char* java_home_var = ::getenv("JAVA_HOME");
1825 if (java_home_var != NULL && java_home_var[0] != 0) {
1826 strncpy(buf, java_home_var, buflen);
1827
1828 // determine if this is a legacy image or modules image
1829 // modules image doesn't have "jre" subdirectory
1830 size_t len = strlen(buf);
1831 char* jrebin_p = buf + len;
1832 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1833 if (0 != _access(buf, 0)) {
1834 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1835 }
1836 len = strlen(buf);
1837 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1838 }
1839 }
1840
1841 if (buf[0] == '\0') {
1842 GetModuleFileName(vm_lib_handle, buf, buflen);
1843 }
1844 strcpy(saved_jvm_path, buf);
1845 }
1846
1847
1848 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1849 #ifndef _WIN64
1850 st->print("_");
1851 #endif
1852 }
1853
1854
1855 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1856 #ifndef _WIN64
1857 st->print("@%d", args_size * sizeof(int));
1858 #endif
1859 }
1860
1861 // This method is a copy of JDK's sysGetLastErrorString
1862 // from src/windows/hpi/src/system_md.c
1863
1864 size_t os::lasterror(char* buf, size_t len) {
1865 DWORD errval;
1866
1867 if ((errval = GetLastError()) != 0) {
1868 // DOS error
1869 size_t n = (size_t)FormatMessage(
1870 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1871 NULL,
1872 errval,
1873 0,
1874 buf,
1875 (DWORD)len,
1876 NULL);
1877 if (n > 3) {
1878 // Drop final '.', CR, LF
1879 if (buf[n - 1] == '\n') n--;
1880 if (buf[n - 1] == '\r') n--;
1881 if (buf[n - 1] == '.') n--;
1882 buf[n] = '\0';
1883 }
1884 return n;
1885 }
1886
1887 if (errno != 0) {
1888 // C runtime error that has no corresponding DOS error code
1889 const char* s = strerror(errno);
1890 size_t n = strlen(s);
1891 if (n >= len) n = len - 1;
1892 strncpy(buf, s, n);
1893 buf[n] = '\0';
1894 return n;
1895 }
1896
1897 return 0;
1898 }
1899
1900 int os::get_last_error() {
1901 DWORD error = GetLastError();
1902 if (error == 0)
1903 error = errno;
1904 return (int)error;
1905 }
1906
1907 // sun.misc.Signal
1908 // NOTE that this is a workaround for an apparent kernel bug where if
1909 // a signal handler for SIGBREAK is installed then that signal handler
1910 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1911 // See bug 4416763.
1912 static void (*sigbreakHandler)(int) = NULL;
1913
1914 static void UserHandler(int sig, void *siginfo, void *context) {
1915 os::signal_notify(sig);
1916 // We need to reinstate the signal handler each time...
1917 os::signal(sig, (void*)UserHandler);
1918 }
1919
1920 void* os::user_handler() {
1921 return (void*) UserHandler;
1922 }
1923
1924 void* os::signal(int signal_number, void* handler) {
1925 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1926 void (*oldHandler)(int) = sigbreakHandler;
1927 sigbreakHandler = (void (*)(int)) handler;
1928 return (void*) oldHandler;
1929 } else {
1930 return (void*)::signal(signal_number, (void (*)(int))handler);
1931 }
1932 }
1933
1934 void os::signal_raise(int signal_number) {
1935 raise(signal_number);
1936 }
1937
1938 // The Win32 C runtime library maps all console control events other than ^C
1939 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1940 // logoff, and shutdown events. We therefore install our own console handler
1941 // that raises SIGTERM for the latter cases.
1942 //
1943 static BOOL WINAPI consoleHandler(DWORD event) {
1944 switch(event) {
1945 case CTRL_C_EVENT:
1946 if (is_error_reported()) {
1947 // Ctrl-C is pressed during error reporting, likely because the error
1948 // handler fails to abort. Let VM die immediately.
1949 os::die();
1950 }
1951
1952 os::signal_raise(SIGINT);
1953 return TRUE;
1954 break;
1955 case CTRL_BREAK_EVENT:
1956 if (sigbreakHandler != NULL) {
1957 (*sigbreakHandler)(SIGBREAK);
1958 }
1959 return TRUE;
1960 break;
1961 case CTRL_LOGOFF_EVENT: {
1962 // Don't terminate JVM if it is running in a non-interactive session,
1963 // such as a service process.
1964 USEROBJECTFLAGS flags;
1965 HANDLE handle = GetProcessWindowStation();
1966 if (handle != NULL &&
1967 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1968 sizeof( USEROBJECTFLAGS), NULL)) {
1969 // If it is a non-interactive session, let next handler to deal
1970 // with it.
1971 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1972 return FALSE;
1973 }
1974 }
1975 }
1976 case CTRL_CLOSE_EVENT:
1977 case CTRL_SHUTDOWN_EVENT:
1978 os::signal_raise(SIGTERM);
1979 return TRUE;
1980 break;
1981 default:
1982 break;
1983 }
1984 return FALSE;
1985 }
1986
1987 /*
1988 * The following code is moved from os.cpp for making this
1989 * code platform specific, which it is by its very nature.
1990 */
1991
1992 // Return maximum OS signal used + 1 for internal use only
1993 // Used as exit signal for signal_thread
1994 int os::sigexitnum_pd(){
1995 return NSIG;
1996 }
1997
1998 // a counter for each possible signal value, including signal_thread exit signal
1999 static volatile jint pending_signals[NSIG+1] = { 0 };
2000 static HANDLE sig_sem = NULL;
2001
2002 void os::signal_init_pd() {
2003 // Initialize signal structures
2004 memset((void*)pending_signals, 0, sizeof(pending_signals));
2005
2006 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2007
2008 // Programs embedding the VM do not want it to attempt to receive
2009 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2010 // shutdown hooks mechanism introduced in 1.3. For example, when
2011 // the VM is run as part of a Windows NT service (i.e., a servlet
2012 // engine in a web server), the correct behavior is for any console
2013 // control handler to return FALSE, not TRUE, because the OS's
2014 // "final" handler for such events allows the process to continue if
2015 // it is a service (while terminating it if it is not a service).
2016 // To make this behavior uniform and the mechanism simpler, we
2017 // completely disable the VM's usage of these console events if -Xrs
2018 // (=ReduceSignalUsage) is specified. This means, for example, that
2019 // the CTRL-BREAK thread dump mechanism is also disabled in this
2020 // case. See bugs 4323062, 4345157, and related bugs.
2021
2022 if (!ReduceSignalUsage) {
2023 // Add a CTRL-C handler
2024 SetConsoleCtrlHandler(consoleHandler, TRUE);
2025 }
2026 }
2027
2028 void os::signal_notify(int signal_number) {
2029 BOOL ret;
2030 if (sig_sem != NULL) {
2031 Atomic::inc(&pending_signals[signal_number]);
2032 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2033 assert(ret != 0, "ReleaseSemaphore() failed");
2034 }
2035 }
2036
2037 static int check_pending_signals(bool wait_for_signal) {
2038 DWORD ret;
2039 while (true) {
2040 for (int i = 0; i < NSIG + 1; i++) {
2041 jint n = pending_signals[i];
2042 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2043 return i;
2044 }
2045 }
2046 if (!wait_for_signal) {
2047 return -1;
2048 }
2049
2050 JavaThread *thread = JavaThread::current();
2051
2052 ThreadBlockInVM tbivm(thread);
2053
2054 bool threadIsSuspended;
2055 do {
2056 thread->set_suspend_equivalent();
2057 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2058 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2059 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2060
2061 // were we externally suspended while we were waiting?
2062 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2063 if (threadIsSuspended) {
2064 //
2065 // The semaphore has been incremented, but while we were waiting
2066 // another thread suspended us. We don't want to continue running
2067 // while suspended because that would surprise the thread that
2068 // suspended us.
2069 //
2070 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2071 assert(ret != 0, "ReleaseSemaphore() failed");
2072
2073 thread->java_suspend_self();
2074 }
2075 } while (threadIsSuspended);
2076 }
2077 }
2078
2079 int os::signal_lookup() {
2080 return check_pending_signals(false);
2081 }
2082
2083 int os::signal_wait() {
2084 return check_pending_signals(true);
2085 }
2086
2087 // Implicit OS exception handling
2088
2089 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2090 JavaThread* thread = JavaThread::current();
2091 // Save pc in thread
2092 #ifdef _M_IA64
2093 // Do not blow up if no thread info available.
2094 if (thread) {
2095 // Saving PRECISE pc (with slot information) in thread.
2096 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2097 // Convert precise PC into "Unix" format
2098 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2099 thread->set_saved_exception_pc((address)precise_pc);
2100 }
2101 // Set pc to handler
2102 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2103 // Clear out psr.ri (= Restart Instruction) in order to continue
2104 // at the beginning of the target bundle.
2105 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2106 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2107 #elif _M_AMD64
2108 // Do not blow up if no thread info available.
2109 if (thread) {
2110 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2111 }
2112 // Set pc to handler
2113 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2114 #else
2115 // Do not blow up if no thread info available.
2116 if (thread) {
2117 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2118 }
2119 // Set pc to handler
2120 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2121 #endif
2122
2123 // Continue the execution
2124 return EXCEPTION_CONTINUE_EXECUTION;
2125 }
2126
2127
2128 // Used for PostMortemDump
2129 extern "C" void safepoints();
2130 extern "C" void find(int x);
2131 extern "C" void events();
2132
2133 // According to Windows API documentation, an illegal instruction sequence should generate
2134 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2135 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2136 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2137
2138 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2139
2140 // From "Execution Protection in the Windows Operating System" draft 0.35
2141 // Once a system header becomes available, the "real" define should be
2142 // included or copied here.
2143 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2144
2145 // Handle NAT Bit consumption on IA64.
2146 #ifdef _M_IA64
2147 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2148 #endif
2149
2150 // Windows Vista/2008 heap corruption check
2151 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2152
2153 #define def_excpt(val) #val, val
2154
2155 struct siglabel {
2156 char *name;
2157 int number;
2158 };
2159
2160 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2161 // C++ compiler contain this error code. Because this is a compiler-generated
2162 // error, the code is not listed in the Win32 API header files.
2163 // The code is actually a cryptic mnemonic device, with the initial "E"
2164 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2165 // ASCII values of "msc".
2166
2167 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2168
2169
2170 struct siglabel exceptlabels[] = {
2171 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2172 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2173 def_excpt(EXCEPTION_BREAKPOINT),
2174 def_excpt(EXCEPTION_SINGLE_STEP),
2175 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2176 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2177 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2178 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2179 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2180 def_excpt(EXCEPTION_FLT_OVERFLOW),
2181 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2182 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2183 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2184 def_excpt(EXCEPTION_INT_OVERFLOW),
2185 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2186 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2187 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2188 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2189 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2190 def_excpt(EXCEPTION_STACK_OVERFLOW),
2191 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2192 def_excpt(EXCEPTION_GUARD_PAGE),
2193 def_excpt(EXCEPTION_INVALID_HANDLE),
2194 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2195 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2196 #ifdef _M_IA64
2197 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2198 #endif
2199 NULL, 0
2200 };
2201
2202 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2203 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2204 if (exceptlabels[i].number == exception_code) {
2205 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2206 return buf;
2207 }
2208 }
2209
2210 return NULL;
2211 }
2212
2213 //-----------------------------------------------------------------------------
2214 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2215 // handle exception caused by idiv; should only happen for -MinInt/-1
2216 // (division by zero is handled explicitly)
2217 #ifdef _M_IA64
2218 assert(0, "Fix Handle_IDiv_Exception");
2219 #elif _M_AMD64
2220 PCONTEXT ctx = exceptionInfo->ContextRecord;
2221 address pc = (address)ctx->Rip;
2222 assert(pc[0] == 0xF7, "not an idiv opcode");
2223 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2224 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2225 // set correct result values and continue after idiv instruction
2226 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2227 ctx->Rax = (DWORD)min_jint; // result
2228 ctx->Rdx = (DWORD)0; // remainder
2229 // Continue the execution
2230 #else
2231 PCONTEXT ctx = exceptionInfo->ContextRecord;
2232 address pc = (address)ctx->Eip;
2233 assert(pc[0] == 0xF7, "not an idiv opcode");
2234 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2235 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2236 // set correct result values and continue after idiv instruction
2237 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2238 ctx->Eax = (DWORD)min_jint; // result
2239 ctx->Edx = (DWORD)0; // remainder
2240 // Continue the execution
2241 #endif
2242 return EXCEPTION_CONTINUE_EXECUTION;
2243 }
2244
2245 //-----------------------------------------------------------------------------
2246 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2247 PCONTEXT ctx = exceptionInfo->ContextRecord;
2248 #ifndef _WIN64
2249 // handle exception caused by native method modifying control word
2250 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2251
2252 switch (exception_code) {
2253 case EXCEPTION_FLT_DENORMAL_OPERAND:
2254 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2255 case EXCEPTION_FLT_INEXACT_RESULT:
2256 case EXCEPTION_FLT_INVALID_OPERATION:
2257 case EXCEPTION_FLT_OVERFLOW:
2258 case EXCEPTION_FLT_STACK_CHECK:
2259 case EXCEPTION_FLT_UNDERFLOW:
2260 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2261 if (fp_control_word != ctx->FloatSave.ControlWord) {
2262 // Restore FPCW and mask out FLT exceptions
2263 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2264 // Mask out pending FLT exceptions
2265 ctx->FloatSave.StatusWord &= 0xffffff00;
2266 return EXCEPTION_CONTINUE_EXECUTION;
2267 }
2268 }
2269
2270 if (prev_uef_handler != NULL) {
2271 // We didn't handle this exception so pass it to the previous
2272 // UnhandledExceptionFilter.
2273 return (prev_uef_handler)(exceptionInfo);
2274 }
2275 #else // !_WIN64
2276 /*
2277 On Windows, the mxcsr control bits are non-volatile across calls
2278 See also CR 6192333
2279 */
2280 jint MxCsr = INITIAL_MXCSR;
2281 // we can't use StubRoutines::addr_mxcsr_std()
2282 // because in Win64 mxcsr is not saved there
2283 if (MxCsr != ctx->MxCsr) {
2284 ctx->MxCsr = MxCsr;
2285 return EXCEPTION_CONTINUE_EXECUTION;
2286 }
2287 #endif // !_WIN64
2288
2289 return EXCEPTION_CONTINUE_SEARCH;
2290 }
2291
2292 // Fatal error reporting is single threaded so we can make this a
2293 // static and preallocated. If it's more than MAX_PATH silently ignore
2294 // it.
2295 static char saved_error_file[MAX_PATH] = {0};
2296
2297 void os::set_error_file(const char *logfile) {
2298 if (strlen(logfile) <= MAX_PATH) {
2299 strncpy(saved_error_file, logfile, MAX_PATH);
2300 }
2301 }
2302
2303 static inline void report_error(Thread* t, DWORD exception_code,
2304 address addr, void* siginfo, void* context) {
2305 VMError err(t, exception_code, addr, siginfo, context);
2306 err.report_and_die();
2307
2308 // If UseOsErrorReporting, this will return here and save the error file
2309 // somewhere where we can find it in the minidump.
2310 }
2311
2312 //-----------------------------------------------------------------------------
2313 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2314 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2315 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2316 #ifdef _M_IA64
2317 // On Itanium, we need the "precise pc", which has the slot number coded
2318 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2319 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2320 // Convert the pc to "Unix format", which has the slot number coded
2321 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2322 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2323 // information is saved in the Unix format.
2324 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2325 #elif _M_AMD64
2326 address pc = (address) exceptionInfo->ContextRecord->Rip;
2327 #else
2328 address pc = (address) exceptionInfo->ContextRecord->Eip;
2329 #endif
2330 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2331
2332 // Handle SafeFetch32 and SafeFetchN exceptions.
2333 if (StubRoutines::is_safefetch_fault(pc)) {
2334 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2335 }
2336
2337 #ifndef _WIN64
2338 // Execution protection violation - win32 running on AMD64 only
2339 // Handled first to avoid misdiagnosis as a "normal" access violation;
2340 // This is safe to do because we have a new/unique ExceptionInformation
2341 // code for this condition.
2342 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2343 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2344 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2345 address addr = (address) exceptionRecord->ExceptionInformation[1];
2346
2347 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2348 int page_size = os::vm_page_size();
2349
2350 // Make sure the pc and the faulting address are sane.
2351 //
2352 // If an instruction spans a page boundary, and the page containing
2353 // the beginning of the instruction is executable but the following
2354 // page is not, the pc and the faulting address might be slightly
2355 // different - we still want to unguard the 2nd page in this case.
2356 //
2357 // 15 bytes seems to be a (very) safe value for max instruction size.
2358 bool pc_is_near_addr =
2359 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2360 bool instr_spans_page_boundary =
2361 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2362 (intptr_t) page_size) > 0);
2363
2364 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2365 static volatile address last_addr =
2366 (address) os::non_memory_address_word();
2367
2368 // In conservative mode, don't unguard unless the address is in the VM
2369 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2370 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2371
2372 // Set memory to RWX and retry
2373 address page_start =
2374 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2375 bool res = os::protect_memory((char*) page_start, page_size,
2376 os::MEM_PROT_RWX);
2377
2378 if (PrintMiscellaneous && Verbose) {
2379 char buf[256];
2380 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2381 "at " INTPTR_FORMAT
2382 ", unguarding " INTPTR_FORMAT ": %s", addr,
2383 page_start, (res ? "success" : strerror(errno)));
2384 tty->print_raw_cr(buf);
2385 }
2386
2387 // Set last_addr so if we fault again at the same address, we don't
2388 // end up in an endless loop.
2389 //
2390 // There are two potential complications here. Two threads trapping
2391 // at the same address at the same time could cause one of the
2392 // threads to think it already unguarded, and abort the VM. Likely
2393 // very rare.
2394 //
2395 // The other race involves two threads alternately trapping at
2396 // different addresses and failing to unguard the page, resulting in
2397 // an endless loop. This condition is probably even more unlikely
2398 // than the first.
2399 //
2400 // Although both cases could be avoided by using locks or thread
2401 // local last_addr, these solutions are unnecessary complication:
2402 // this handler is a best-effort safety net, not a complete solution.
2403 // It is disabled by default and should only be used as a workaround
2404 // in case we missed any no-execute-unsafe VM code.
2405
2406 last_addr = addr;
2407
2408 return EXCEPTION_CONTINUE_EXECUTION;
2409 }
2410 }
2411
2412 // Last unguard failed or not unguarding
2413 tty->print_raw_cr("Execution protection violation");
2414 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2415 exceptionInfo->ContextRecord);
2416 return EXCEPTION_CONTINUE_SEARCH;
2417 }
2418 }
2419 #endif // _WIN64
2420
2421 // Check to see if we caught the safepoint code in the
2422 // process of write protecting the memory serialization page.
2423 // It write enables the page immediately after protecting it
2424 // so just return.
2425 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2426 JavaThread* thread = (JavaThread*) t;
2427 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2428 address addr = (address) exceptionRecord->ExceptionInformation[1];
2429 if ( os::is_memory_serialize_page(thread, addr) ) {
2430 // Block current thread until the memory serialize page permission restored.
2431 os::block_on_serialize_page_trap();
2432 return EXCEPTION_CONTINUE_EXECUTION;
2433 }
2434 }
2435
2436 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2437 VM_Version::is_cpuinfo_segv_addr(pc)) {
2438 // Verify that OS save/restore AVX registers.
2439 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2440 }
2441
2442 if (t != NULL && t->is_Java_thread()) {
2443 JavaThread* thread = (JavaThread*) t;
2444 bool in_java = thread->thread_state() == _thread_in_Java;
2445
2446 // Handle potential stack overflows up front.
2447 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2448 if (os::uses_stack_guard_pages()) {
2449 #ifdef _M_IA64
2450 // Use guard page for register stack.
2451 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2452 address addr = (address) exceptionRecord->ExceptionInformation[1];
2453 // Check for a register stack overflow on Itanium
2454 if (thread->addr_inside_register_stack_red_zone(addr)) {
2455 // Fatal red zone violation happens if the Java program
2456 // catches a StackOverflow error and does so much processing
2457 // that it runs beyond the unprotected yellow guard zone. As
2458 // a result, we are out of here.
2459 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2460 } else if(thread->addr_inside_register_stack(addr)) {
2461 // Disable the yellow zone which sets the state that
2462 // we've got a stack overflow problem.
2463 if (thread->stack_yellow_zone_enabled()) {
2464 thread->disable_stack_yellow_zone();
2465 }
2466 // Give us some room to process the exception.
2467 thread->disable_register_stack_guard();
2468 // Tracing with +Verbose.
2469 if (Verbose) {
2470 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2471 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2472 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2473 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2474 thread->register_stack_base(),
2475 thread->register_stack_base() + thread->stack_size());
2476 }
2477
2478 // Reguard the permanent register stack red zone just to be sure.
2479 // We saw Windows silently disabling this without telling us.
2480 thread->enable_register_stack_red_zone();
2481
2482 return Handle_Exception(exceptionInfo,
2483 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2484 }
2485 #endif
2486 if (thread->stack_yellow_zone_enabled()) {
2487 // Yellow zone violation. The o/s has unprotected the first yellow
2488 // zone page for us. Note: must call disable_stack_yellow_zone to
2489 // update the enabled status, even if the zone contains only one page.
2490 thread->disable_stack_yellow_zone();
2491 // If not in java code, return and hope for the best.
2492 return in_java ? Handle_Exception(exceptionInfo,
2493 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2494 : EXCEPTION_CONTINUE_EXECUTION;
2495 } else {
2496 // Fatal red zone violation.
2497 thread->disable_stack_red_zone();
2498 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2499 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2500 exceptionInfo->ContextRecord);
2501 return EXCEPTION_CONTINUE_SEARCH;
2502 }
2503 } else if (in_java) {
2504 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2505 // a one-time-only guard page, which it has released to us. The next
2506 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2507 return Handle_Exception(exceptionInfo,
2508 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2509 } else {
2510 // Can only return and hope for the best. Further stack growth will
2511 // result in an ACCESS_VIOLATION.
2512 return EXCEPTION_CONTINUE_EXECUTION;
2513 }
2514 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2515 // Either stack overflow or null pointer exception.
2516 if (in_java) {
2517 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2518 address addr = (address) exceptionRecord->ExceptionInformation[1];
2519 address stack_end = thread->stack_base() - thread->stack_size();
2520 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2521 // Stack overflow.
2522 assert(!os::uses_stack_guard_pages(),
2523 "should be caught by red zone code above.");
2524 return Handle_Exception(exceptionInfo,
2525 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2526 }
2527 //
2528 // Check for safepoint polling and implicit null
2529 // We only expect null pointers in the stubs (vtable)
2530 // the rest are checked explicitly now.
2531 //
2532 CodeBlob* cb = CodeCache::find_blob(pc);
2533 if (cb != NULL) {
2534 if (os::is_poll_address(addr)) {
2535 address stub = SharedRuntime::get_poll_stub(pc);
2536 return Handle_Exception(exceptionInfo, stub);
2537 }
2538 }
2539 {
2540 #ifdef _WIN64
2541 //
2542 // If it's a legal stack address map the entire region in
2543 //
2544 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2545 address addr = (address) exceptionRecord->ExceptionInformation[1];
2546 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2547 addr = (address)((uintptr_t)addr &
2548 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2549 os::commit_memory((char *)addr, thread->stack_base() - addr,
2550 !ExecMem);
2551 return EXCEPTION_CONTINUE_EXECUTION;
2552 }
2553 else
2554 #endif
2555 {
2556 // Null pointer exception.
2557 #ifdef _M_IA64
2558 // Process implicit null checks in compiled code. Note: Implicit null checks
2559 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2560 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2561 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2562 // Handle implicit null check in UEP method entry
2563 if (cb && (cb->is_frame_complete_at(pc) ||
2564 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2565 if (Verbose) {
2566 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2567 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2568 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2569 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2570 *(bundle_start + 1), *bundle_start);
2571 }
2572 return Handle_Exception(exceptionInfo,
2573 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2574 }
2575 }
2576
2577 // Implicit null checks were processed above. Hence, we should not reach
2578 // here in the usual case => die!
2579 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2580 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2581 exceptionInfo->ContextRecord);
2582 return EXCEPTION_CONTINUE_SEARCH;
2583
2584 #else // !IA64
2585
2586 // Windows 98 reports faulting addresses incorrectly
2587 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2588 !os::win32::is_nt()) {
2589 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2590 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2591 }
2592 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2593 exceptionInfo->ContextRecord);
2594 return EXCEPTION_CONTINUE_SEARCH;
2595 #endif
2596 }
2597 }
2598 }
2599
2600 #ifdef _WIN64
2601 // Special care for fast JNI field accessors.
2602 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2603 // in and the heap gets shrunk before the field access.
2604 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2605 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2606 if (addr != (address)-1) {
2607 return Handle_Exception(exceptionInfo, addr);
2608 }
2609 }
2610 #endif
2611
2612 // Stack overflow or null pointer exception in native code.
2613 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2614 exceptionInfo->ContextRecord);
2615 return EXCEPTION_CONTINUE_SEARCH;
2616 } // /EXCEPTION_ACCESS_VIOLATION
2617 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2618 #if defined _M_IA64
2619 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2620 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2621 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2622
2623 // Compiled method patched to be non entrant? Following conditions must apply:
2624 // 1. must be first instruction in bundle
2625 // 2. must be a break instruction with appropriate code
2626 if((((uint64_t) pc & 0x0F) == 0) &&
2627 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2628 return Handle_Exception(exceptionInfo,
2629 (address)SharedRuntime::get_handle_wrong_method_stub());
2630 }
2631 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2632 #endif
2633
2634
2635 if (in_java) {
2636 switch (exception_code) {
2637 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2638 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2639
2640 case EXCEPTION_INT_OVERFLOW:
2641 return Handle_IDiv_Exception(exceptionInfo);
2642
2643 } // switch
2644 }
2645 if (((thread->thread_state() == _thread_in_Java) ||
2646 (thread->thread_state() == _thread_in_native)) &&
2647 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2648 {
2649 LONG result=Handle_FLT_Exception(exceptionInfo);
2650 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2651 }
2652 }
2653
2654 if (exception_code != EXCEPTION_BREAKPOINT) {
2655 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2656 exceptionInfo->ContextRecord);
2657 }
2658 return EXCEPTION_CONTINUE_SEARCH;
2659 }
2660
2661 #ifndef _WIN64
2662 // Special care for fast JNI accessors.
2663 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2664 // the heap gets shrunk before the field access.
2665 // Need to install our own structured exception handler since native code may
2666 // install its own.
2667 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2668 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2669 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2670 address pc = (address) exceptionInfo->ContextRecord->Eip;
2671 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2672 if (addr != (address)-1) {
2673 return Handle_Exception(exceptionInfo, addr);
2674 }
2675 }
2676 return EXCEPTION_CONTINUE_SEARCH;
2677 }
2678
2679 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2680 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2681 __try { \
2682 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2683 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2684 } \
2685 return 0; \
2686 }
2687
2688 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2689 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2690 DEFINE_FAST_GETFIELD(jchar, char, Char)
2691 DEFINE_FAST_GETFIELD(jshort, short, Short)
2692 DEFINE_FAST_GETFIELD(jint, int, Int)
2693 DEFINE_FAST_GETFIELD(jlong, long, Long)
2694 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2695 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2696
2697 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2698 switch (type) {
2699 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2700 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2701 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2702 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2703 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2704 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2705 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2706 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2707 default: ShouldNotReachHere();
2708 }
2709 return (address)-1;
2710 }
2711 #endif
2712
2713 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2714 // Install a win32 structured exception handler around the test
2715 // function call so the VM can generate an error dump if needed.
2716 __try {
2717 (*funcPtr)();
2718 } __except(topLevelExceptionFilter(
2719 (_EXCEPTION_POINTERS*)_exception_info())) {
2720 // Nothing to do.
2721 }
2722 }
2723
2724 // Virtual Memory
2725
2726 int os::vm_page_size() { return os::win32::vm_page_size(); }
2727 int os::vm_allocation_granularity() {
2728 return os::win32::vm_allocation_granularity();
2729 }
2730
2731 // Windows large page support is available on Windows 2003. In order to use
2732 // large page memory, the administrator must first assign additional privilege
2733 // to the user:
2734 // + select Control Panel -> Administrative Tools -> Local Security Policy
2735 // + select Local Policies -> User Rights Assignment
2736 // + double click "Lock pages in memory", add users and/or groups
2737 // + reboot
2738 // Note the above steps are needed for administrator as well, as administrators
2739 // by default do not have the privilege to lock pages in memory.
2740 //
2741 // Note about Windows 2003: although the API supports committing large page
2742 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2743 // scenario, I found through experiment it only uses large page if the entire
2744 // memory region is reserved and committed in a single VirtualAlloc() call.
2745 // This makes Windows large page support more or less like Solaris ISM, in
2746 // that the entire heap must be committed upfront. This probably will change
2747 // in the future, if so the code below needs to be revisited.
2748
2749 #ifndef MEM_LARGE_PAGES
2750 #define MEM_LARGE_PAGES 0x20000000
2751 #endif
2752
2753 static HANDLE _hProcess;
2754 static HANDLE _hToken;
2755
2756 // Container for NUMA node list info
2757 class NUMANodeListHolder {
2758 private:
2759 int *_numa_used_node_list; // allocated below
2760 int _numa_used_node_count;
2761
2762 void free_node_list() {
2763 if (_numa_used_node_list != NULL) {
2764 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2765 }
2766 }
2767
2768 public:
2769 NUMANodeListHolder() {
2770 _numa_used_node_count = 0;
2771 _numa_used_node_list = NULL;
2772 // do rest of initialization in build routine (after function pointers are set up)
2773 }
2774
2775 ~NUMANodeListHolder() {
2776 free_node_list();
2777 }
2778
2779 bool build() {
2780 DWORD_PTR proc_aff_mask;
2781 DWORD_PTR sys_aff_mask;
2782 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2783 ULONG highest_node_number;
2784 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2785 free_node_list();
2786 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2787 for (unsigned int i = 0; i <= highest_node_number; i++) {
2788 ULONGLONG proc_mask_numa_node;
2789 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2790 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2791 _numa_used_node_list[_numa_used_node_count++] = i;
2792 }
2793 }
2794 return (_numa_used_node_count > 1);
2795 }
2796
2797 int get_count() {return _numa_used_node_count;}
2798 int get_node_list_entry(int n) {
2799 // for indexes out of range, returns -1
2800 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2801 }
2802
2803 } numa_node_list_holder;
2804
2805
2806
2807 static size_t _large_page_size = 0;
2808
2809 static bool resolve_functions_for_large_page_init() {
2810 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2811 os::Advapi32Dll::AdvapiAvailable();
2812 }
2813
2814 static bool request_lock_memory_privilege() {
2815 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2816 os::current_process_id());
2817
2818 LUID luid;
2819 if (_hProcess != NULL &&
2820 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2821 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2822
2823 TOKEN_PRIVILEGES tp;
2824 tp.PrivilegeCount = 1;
2825 tp.Privileges[0].Luid = luid;
2826 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2827
2828 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2829 // privilege. Check GetLastError() too. See MSDN document.
2830 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2831 (GetLastError() == ERROR_SUCCESS)) {
2832 return true;
2833 }
2834 }
2835
2836 return false;
2837 }
2838
2839 static void cleanup_after_large_page_init() {
2840 if (_hProcess) CloseHandle(_hProcess);
2841 _hProcess = NULL;
2842 if (_hToken) CloseHandle(_hToken);
2843 _hToken = NULL;
2844 }
2845
2846 static bool numa_interleaving_init() {
2847 bool success = false;
2848 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2849
2850 // print a warning if UseNUMAInterleaving flag is specified on command line
2851 bool warn_on_failure = use_numa_interleaving_specified;
2852 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2853
2854 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2855 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2856 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2857
2858 if (os::Kernel32Dll::NumaCallsAvailable()) {
2859 if (numa_node_list_holder.build()) {
2860 if (PrintMiscellaneous && Verbose) {
2861 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2862 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2863 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2864 }
2865 tty->print("\n");
2866 }
2867 success = true;
2868 } else {
2869 WARN("Process does not cover multiple NUMA nodes.");
2870 }
2871 } else {
2872 WARN("NUMA Interleaving is not supported by the operating system.");
2873 }
2874 if (!success) {
2875 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2876 }
2877 return success;
2878 #undef WARN
2879 }
2880
2881 // this routine is used whenever we need to reserve a contiguous VA range
2882 // but we need to make separate VirtualAlloc calls for each piece of the range
2883 // Reasons for doing this:
2884 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2885 // * UseNUMAInterleaving requires a separate node for each piece
2886 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2887 bool should_inject_error=false) {
2888 char * p_buf;
2889 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2890 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2891 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2892
2893 // first reserve enough address space in advance since we want to be
2894 // able to break a single contiguous virtual address range into multiple
2895 // large page commits but WS2003 does not allow reserving large page space
2896 // so we just use 4K pages for reserve, this gives us a legal contiguous
2897 // address space. then we will deallocate that reservation, and re alloc
2898 // using large pages
2899 const size_t size_of_reserve = bytes + chunk_size;
2900 if (bytes > size_of_reserve) {
2901 // Overflowed.
2902 return NULL;
2903 }
2904 p_buf = (char *) VirtualAlloc(addr,
2905 size_of_reserve, // size of Reserve
2906 MEM_RESERVE,
2907 PAGE_READWRITE);
2908 // If reservation failed, return NULL
2909 if (p_buf == NULL) return NULL;
2910 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
2911 os::release_memory(p_buf, bytes + chunk_size);
2912
2913 // we still need to round up to a page boundary (in case we are using large pages)
2914 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2915 // instead we handle this in the bytes_to_rq computation below
2916 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2917
2918 // now go through and allocate one chunk at a time until all bytes are
2919 // allocated
2920 size_t bytes_remaining = bytes;
2921 // An overflow of align_size_up() would have been caught above
2922 // in the calculation of size_of_reserve.
2923 char * next_alloc_addr = p_buf;
2924 HANDLE hProc = GetCurrentProcess();
2925
2926 #ifdef ASSERT
2927 // Variable for the failure injection
2928 long ran_num = os::random();
2929 size_t fail_after = ran_num % bytes;
2930 #endif
2931
2932 int count=0;
2933 while (bytes_remaining) {
2934 // select bytes_to_rq to get to the next chunk_size boundary
2935
2936 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2937 // Note allocate and commit
2938 char * p_new;
2939
2940 #ifdef ASSERT
2941 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2942 #else
2943 const bool inject_error_now = false;
2944 #endif
2945
2946 if (inject_error_now) {
2947 p_new = NULL;
2948 } else {
2949 if (!UseNUMAInterleaving) {
2950 p_new = (char *) VirtualAlloc(next_alloc_addr,
2951 bytes_to_rq,
2952 flags,
2953 prot);
2954 } else {
2955 // get the next node to use from the used_node_list
2956 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2957 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2958 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2959 next_alloc_addr,
2960 bytes_to_rq,
2961 flags,
2962 prot,
2963 node);
2964 }
2965 }
2966
2967 if (p_new == NULL) {
2968 // Free any allocated pages
2969 if (next_alloc_addr > p_buf) {
2970 // Some memory was committed so release it.
2971 size_t bytes_to_release = bytes - bytes_remaining;
2972 // NMT has yet to record any individual blocks, so it
2973 // need to create a dummy 'reserve' record to match
2974 // the release.
2975 MemTracker::record_virtual_memory_reserve((address)p_buf,
2976 bytes_to_release, mtNone, CALLER_PC);
2977 os::release_memory(p_buf, bytes_to_release);
2978 }
2979 #ifdef ASSERT
2980 if (should_inject_error) {
2981 if (TracePageSizes && Verbose) {
2982 tty->print_cr("Reserving pages individually failed.");
2983 }
2984 }
2985 #endif
2986 return NULL;
2987 }
2988
2989 bytes_remaining -= bytes_to_rq;
2990 next_alloc_addr += bytes_to_rq;
2991 count++;
2992 }
2993 // Although the memory is allocated individually, it is returned as one.
2994 // NMT records it as one block.
2995 address pc = CALLER_PC;
2996 if ((flags & MEM_COMMIT) != 0) {
2997 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
2998 } else {
2999 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
3000 }
3001
3002 // made it this far, success
3003 return p_buf;
3004 }
3005
3006
3007
3008 void os::large_page_init() {
3009 if (!UseLargePages) return;
3010
3011 // print a warning if any large page related flag is specified on command line
3012 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3013 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3014 bool success = false;
3015
3016 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3017 if (resolve_functions_for_large_page_init()) {
3018 if (request_lock_memory_privilege()) {
3019 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3020 if (s) {
3021 #if defined(IA32) || defined(AMD64)
3022 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3023 WARN("JVM cannot use large pages bigger than 4mb.");
3024 } else {
3025 #endif
3026 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3027 _large_page_size = LargePageSizeInBytes;
3028 } else {
3029 _large_page_size = s;
3030 }
3031 success = true;
3032 #if defined(IA32) || defined(AMD64)
3033 }
3034 #endif
3035 } else {
3036 WARN("Large page is not supported by the processor.");
3037 }
3038 } else {
3039 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3040 }
3041 } else {
3042 WARN("Large page is not supported by the operating system.");
3043 }
3044 #undef WARN
3045
3046 const size_t default_page_size = (size_t) vm_page_size();
3047 if (success && _large_page_size > default_page_size) {
3048 _page_sizes[0] = _large_page_size;
3049 _page_sizes[1] = default_page_size;
3050 _page_sizes[2] = 0;
3051 }
3052
3053 cleanup_after_large_page_init();
3054 UseLargePages = success;
3055 }
3056
3057 // On win32, one cannot release just a part of reserved memory, it's an
3058 // all or nothing deal. When we split a reservation, we must break the
3059 // reservation into two reservations.
3060 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3061 bool realloc) {
3062 if (size > 0) {
3063 release_memory(base, size);
3064 if (realloc) {
3065 reserve_memory(split, base);
3066 }
3067 if (size != split) {
3068 reserve_memory(size - split, base + split);
3069 }
3070 }
3071 }
3072
3073 // Multiple threads can race in this code but it's not possible to unmap small sections of
3074 // virtual space to get requested alignment, like posix-like os's.
3075 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3076 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3077 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3078 "Alignment must be a multiple of allocation granularity (page size)");
3079 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3080
3081 size_t extra_size = size + alignment;
3082 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3083
3084 char* aligned_base = NULL;
3085
3086 do {
3087 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3088 if (extra_base == NULL) {
3089 return NULL;
3090 }
3091 // Do manual alignment
3092 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3093
3094 os::release_memory(extra_base, extra_size);
3095
3096 aligned_base = os::reserve_memory(size, aligned_base);
3097
3098 } while (aligned_base == NULL);
3099
3100 return aligned_base;
3101 }
3102
3103 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3104 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3105 "reserve alignment");
3106 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3107 char* res;
3108 // note that if UseLargePages is on, all the areas that require interleaving
3109 // will go thru reserve_memory_special rather than thru here.
3110 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3111 if (!use_individual) {
3112 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3113 } else {
3114 elapsedTimer reserveTimer;
3115 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3116 // in numa interleaving, we have to allocate pages individually
3117 // (well really chunks of NUMAInterleaveGranularity size)
3118 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3119 if (res == NULL) {
3120 warning("NUMA page allocation failed");
3121 }
3122 if( Verbose && PrintMiscellaneous ) {
3123 reserveTimer.stop();
3124 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3125 reserveTimer.milliseconds(), reserveTimer.ticks());
3126 }
3127 }
3128 assert(res == NULL || addr == NULL || addr == res,
3129 "Unexpected address from reserve.");
3130
3131 return res;
3132 }
3133
3134 // Reserve memory at an arbitrary address, only if that area is
3135 // available (and not reserved for something else).
3136 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3137 // Windows os::reserve_memory() fails of the requested address range is
3138 // not avilable.
3139 return reserve_memory(bytes, requested_addr);
3140 }
3141
3142 size_t os::large_page_size() {
3143 return _large_page_size;
3144 }
3145
3146 bool os::can_commit_large_page_memory() {
3147 // Windows only uses large page memory when the entire region is reserved
3148 // and committed in a single VirtualAlloc() call. This may change in the
3149 // future, but with Windows 2003 it's not possible to commit on demand.
3150 return false;
3151 }
3152
3153 bool os::can_execute_large_page_memory() {
3154 return true;
3155 }
3156
3157 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3158 assert(UseLargePages, "only for large pages");
3159
3160 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3161 return NULL; // Fallback to small pages.
3162 }
3163
3164 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3165 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3166
3167 // with large pages, there are two cases where we need to use Individual Allocation
3168 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3169 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3170 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3171 if (TracePageSizes && Verbose) {
3172 tty->print_cr("Reserving large pages individually.");
3173 }
3174 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3175 if (p_buf == NULL) {
3176 // give an appropriate warning message
3177 if (UseNUMAInterleaving) {
3178 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3179 }
3180 if (UseLargePagesIndividualAllocation) {
3181 warning("Individually allocated large pages failed, "
3182 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3183 }
3184 return NULL;
3185 }
3186
3187 return p_buf;
3188
3189 } else {
3190 if (TracePageSizes && Verbose) {
3191 tty->print_cr("Reserving large pages in a single large chunk.");
3192 }
3193 // normal policy just allocate it all at once
3194 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3195 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3196 if (res != NULL) {
3197 address pc = CALLER_PC;
3198 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
3199 }
3200
3201 return res;
3202 }
3203 }
3204
3205 bool os::release_memory_special(char* base, size_t bytes) {
3206 assert(base != NULL, "Sanity check");
3207 return release_memory(base, bytes);
3208 }
3209
3210 void os::print_statistics() {
3211 }
3212
3213 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3214 int err = os::get_last_error();
3215 char buf[256];
3216 size_t buf_len = os::lasterror(buf, sizeof(buf));
3217 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3218 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3219 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3220 }
3221
3222 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3223 if (bytes == 0) {
3224 // Don't bother the OS with noops.
3225 return true;
3226 }
3227 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3228 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3229 // Don't attempt to print anything if the OS call fails. We're
3230 // probably low on resources, so the print itself may cause crashes.
3231
3232 // unless we have NUMAInterleaving enabled, the range of a commit
3233 // is always within a reserve covered by a single VirtualAlloc
3234 // in that case we can just do a single commit for the requested size
3235 if (!UseNUMAInterleaving) {
3236 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3237 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3238 return false;
3239 }
3240 if (exec) {
3241 DWORD oldprot;
3242 // Windows doc says to use VirtualProtect to get execute permissions
3243 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3244 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3245 return false;
3246 }
3247 }
3248 return true;
3249 } else {
3250
3251 // when NUMAInterleaving is enabled, the commit might cover a range that
3252 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3253 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3254 // returns represents the number of bytes that can be committed in one step.
3255 size_t bytes_remaining = bytes;
3256 char * next_alloc_addr = addr;
3257 while (bytes_remaining > 0) {
3258 MEMORY_BASIC_INFORMATION alloc_info;
3259 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3260 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3261 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3262 PAGE_READWRITE) == NULL) {
3263 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3264 exec);)
3265 return false;
3266 }
3267 if (exec) {
3268 DWORD oldprot;
3269 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3270 PAGE_EXECUTE_READWRITE, &oldprot)) {
3271 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3272 exec);)
3273 return false;
3274 }
3275 }
3276 bytes_remaining -= bytes_to_rq;
3277 next_alloc_addr += bytes_to_rq;
3278 }
3279 }
3280 // if we made it this far, return true
3281 return true;
3282 }
3283
3284 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3285 bool exec) {
3286 // alignment_hint is ignored on this OS
3287 return pd_commit_memory(addr, size, exec);
3288 }
3289
3290 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3291 const char* mesg) {
3292 assert(mesg != NULL, "mesg must be specified");
3293 if (!pd_commit_memory(addr, size, exec)) {
3294 warn_fail_commit_memory(addr, size, exec);
3295 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3296 }
3297 }
3298
3299 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3300 size_t alignment_hint, bool exec,
3301 const char* mesg) {
3302 // alignment_hint is ignored on this OS
3303 pd_commit_memory_or_exit(addr, size, exec, mesg);
3304 }
3305
3306 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3307 if (bytes == 0) {
3308 // Don't bother the OS with noops.
3309 return true;
3310 }
3311 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3312 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3313 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3314 }
3315
3316 bool os::pd_release_memory(char* addr, size_t bytes) {
3317 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3318 }
3319
3320 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3321 return os::commit_memory(addr, size, !ExecMem);
3322 }
3323
3324 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3325 return os::uncommit_memory(addr, size);
3326 }
3327
3328 // Set protections specified
3329 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3330 bool is_committed) {
3331 unsigned int p = 0;
3332 switch (prot) {
3333 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3334 case MEM_PROT_READ: p = PAGE_READONLY; break;
3335 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3336 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3337 default:
3338 ShouldNotReachHere();
3339 }
3340
3341 DWORD old_status;
3342
3343 // Strange enough, but on Win32 one can change protection only for committed
3344 // memory, not a big deal anyway, as bytes less or equal than 64K
3345 if (!is_committed) {
3346 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3347 "cannot commit protection page");
3348 }
3349 // One cannot use os::guard_memory() here, as on Win32 guard page
3350 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3351 //
3352 // Pages in the region become guard pages. Any attempt to access a guard page
3353 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3354 // the guard page status. Guard pages thus act as a one-time access alarm.
3355 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3356 }
3357
3358 bool os::guard_memory(char* addr, size_t bytes) {
3359 DWORD old_status;
3360 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3361 }
3362
3363 bool os::unguard_memory(char* addr, size_t bytes) {
3364 DWORD old_status;
3365 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3366 }
3367
3368 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3369 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3370 void os::numa_make_global(char *addr, size_t bytes) { }
3371 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3372 bool os::numa_topology_changed() { return false; }
3373 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3374 int os::numa_get_group_id() { return 0; }
3375 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3376 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3377 // Provide an answer for UMA systems
3378 ids[0] = 0;
3379 return 1;
3380 } else {
3381 // check for size bigger than actual groups_num
3382 size = MIN2(size, numa_get_groups_num());
3383 for (int i = 0; i < (int)size; i++) {
3384 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3385 }
3386 return size;
3387 }
3388 }
3389
3390 bool os::get_page_info(char *start, page_info* info) {
3391 return false;
3392 }
3393
3394 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3395 return end;
3396 }
3397
3398 char* os::non_memory_address_word() {
3399 // Must never look like an address returned by reserve_memory,
3400 // even in its subfields (as defined by the CPU immediate fields,
3401 // if the CPU splits constants across multiple instructions).
3402 return (char*)-1;
3403 }
3404
3405 #define MAX_ERROR_COUNT 100
3406 #define SYS_THREAD_ERROR 0xffffffffUL
3407
3408 void os::pd_start_thread(Thread* thread) {
3409 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3410 // Returns previous suspend state:
3411 // 0: Thread was not suspended
3412 // 1: Thread is running now
3413 // >1: Thread is still suspended.
3414 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3415 }
3416
3417 class HighResolutionInterval : public CHeapObj<mtThread> {
3418 // The default timer resolution seems to be 10 milliseconds.
3419 // (Where is this written down?)
3420 // If someone wants to sleep for only a fraction of the default,
3421 // then we set the timer resolution down to 1 millisecond for
3422 // the duration of their interval.
3423 // We carefully set the resolution back, since otherwise we
3424 // seem to incur an overhead (3%?) that we don't need.
3425 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3426 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3427 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3428 // timeBeginPeriod() if the relative error exceeded some threshold.
3429 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3430 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3431 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3432 // resolution timers running.
3433 private:
3434 jlong resolution;
3435 public:
3436 HighResolutionInterval(jlong ms) {
3437 resolution = ms % 10L;
3438 if (resolution != 0) {
3439 MMRESULT result = timeBeginPeriod(1L);
3440 }
3441 }
3442 ~HighResolutionInterval() {
3443 if (resolution != 0) {
3444 MMRESULT result = timeEndPeriod(1L);
3445 }
3446 resolution = 0L;
3447 }
3448 };
3449
3450 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3451 jlong limit = (jlong) MAXDWORD;
3452
3453 while(ms > limit) {
3454 int res;
3455 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3456 return res;
3457 ms -= limit;
3458 }
3459
3460 assert(thread == Thread::current(), "thread consistency check");
3461 OSThread* osthread = thread->osthread();
3462 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3463 int result;
3464 if (interruptable) {
3465 assert(thread->is_Java_thread(), "must be java thread");
3466 JavaThread *jt = (JavaThread *) thread;
3467 ThreadBlockInVM tbivm(jt);
3468
3469 jt->set_suspend_equivalent();
3470 // cleared by handle_special_suspend_equivalent_condition() or
3471 // java_suspend_self() via check_and_wait_while_suspended()
3472
3473 HANDLE events[1];
3474 events[0] = osthread->interrupt_event();
3475 HighResolutionInterval *phri=NULL;
3476 if(!ForceTimeHighResolution)
3477 phri = new HighResolutionInterval( ms );
3478 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3479 result = OS_TIMEOUT;
3480 } else {
3481 ResetEvent(osthread->interrupt_event());
3482 osthread->set_interrupted(false);
3483 result = OS_INTRPT;
3484 }
3485 delete phri; //if it is NULL, harmless
3486
3487 // were we externally suspended while we were waiting?
3488 jt->check_and_wait_while_suspended();
3489 } else {
3490 assert(!thread->is_Java_thread(), "must not be java thread");
3491 Sleep((long) ms);
3492 result = OS_TIMEOUT;
3493 }
3494 return result;
3495 }
3496
3497 //
3498 // Short sleep, direct OS call.
3499 //
3500 // ms = 0, means allow others (if any) to run.
3501 //
3502 void os::naked_short_sleep(jlong ms) {
3503 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3504 Sleep(ms);
3505 }
3506
3507 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3508 void os::infinite_sleep() {
3509 while (true) { // sleep forever ...
3510 Sleep(100000); // ... 100 seconds at a time
3511 }
3512 }
3513
3514 typedef BOOL (WINAPI * STTSignature)(void) ;
3515
3516 os::YieldResult os::NakedYield() {
3517 // Use either SwitchToThread() or Sleep(0)
3518 // Consider passing back the return value from SwitchToThread().
3519 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3520 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3521 } else {
3522 Sleep(0);
3523 }
3524 return os::YIELD_UNKNOWN ;
3525 }
3526
3527 void os::yield() { os::NakedYield(); }
3528
3529 // Win32 only gives you access to seven real priorities at a time,
3530 // so we compress Java's ten down to seven. It would be better
3531 // if we dynamically adjusted relative priorities.
3532
3533 int os::java_to_os_priority[CriticalPriority + 1] = {
3534 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3535 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3536 THREAD_PRIORITY_LOWEST, // 2
3537 THREAD_PRIORITY_BELOW_NORMAL, // 3
3538 THREAD_PRIORITY_BELOW_NORMAL, // 4
3539 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3540 THREAD_PRIORITY_NORMAL, // 6
3541 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3542 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3543 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3544 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3545 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3546 };
3547
3548 int prio_policy1[CriticalPriority + 1] = {
3549 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3550 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3551 THREAD_PRIORITY_LOWEST, // 2
3552 THREAD_PRIORITY_BELOW_NORMAL, // 3
3553 THREAD_PRIORITY_BELOW_NORMAL, // 4
3554 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3555 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3556 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3557 THREAD_PRIORITY_HIGHEST, // 8
3558 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3559 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3560 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3561 };
3562
3563 static int prio_init() {
3564 // If ThreadPriorityPolicy is 1, switch tables
3565 if (ThreadPriorityPolicy == 1) {
3566 int i;
3567 for (i = 0; i < CriticalPriority + 1; i++) {
3568 os::java_to_os_priority[i] = prio_policy1[i];
3569 }
3570 }
3571 if (UseCriticalJavaThreadPriority) {
3572 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3573 }
3574 return 0;
3575 }
3576
3577 OSReturn os::set_native_priority(Thread* thread, int priority) {
3578 if (!UseThreadPriorities) return OS_OK;
3579 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3580 return ret ? OS_OK : OS_ERR;
3581 }
3582
3583 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3584 if ( !UseThreadPriorities ) {
3585 *priority_ptr = java_to_os_priority[NormPriority];
3586 return OS_OK;
3587 }
3588 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3589 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3590 assert(false, "GetThreadPriority failed");
3591 return OS_ERR;
3592 }
3593 *priority_ptr = os_prio;
3594 return OS_OK;
3595 }
3596
3597
3598 // Hint to the underlying OS that a task switch would not be good.
3599 // Void return because it's a hint and can fail.
3600 void os::hint_no_preempt() {}
3601
3602 void os::interrupt(Thread* thread) {
3603 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3604 "possibility of dangling Thread pointer");
3605
3606 OSThread* osthread = thread->osthread();
3607 osthread->set_interrupted(true);
3608 // More than one thread can get here with the same value of osthread,
3609 // resulting in multiple notifications. We do, however, want the store
3610 // to interrupted() to be visible to other threads before we post
3611 // the interrupt event.
3612 OrderAccess::release();
3613 SetEvent(osthread->interrupt_event());
3614 // For JSR166: unpark after setting status
3615 if (thread->is_Java_thread())
3616 ((JavaThread*)thread)->parker()->unpark();
3617
3618 ParkEvent * ev = thread->_ParkEvent ;
3619 if (ev != NULL) ev->unpark() ;
3620
3621 }
3622
3623
3624 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3625 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3626 "possibility of dangling Thread pointer");
3627
3628 OSThread* osthread = thread->osthread();
3629 // There is no synchronization between the setting of the interrupt
3630 // and it being cleared here. It is critical - see 6535709 - that
3631 // we only clear the interrupt state, and reset the interrupt event,
3632 // if we are going to report that we were indeed interrupted - else
3633 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3634 // depending on the timing. By checking thread interrupt event to see
3635 // if the thread gets real interrupt thus prevent spurious wakeup.
3636 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3637 if (interrupted && clear_interrupted) {
3638 osthread->set_interrupted(false);
3639 ResetEvent(osthread->interrupt_event());
3640 } // Otherwise leave the interrupted state alone
3641
3642 return interrupted;
3643 }
3644
3645 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3646 ExtendedPC os::get_thread_pc(Thread* thread) {
3647 CONTEXT context;
3648 context.ContextFlags = CONTEXT_CONTROL;
3649 HANDLE handle = thread->osthread()->thread_handle();
3650 #ifdef _M_IA64
3651 assert(0, "Fix get_thread_pc");
3652 return ExtendedPC(NULL);
3653 #else
3654 if (GetThreadContext(handle, &context)) {
3655 #ifdef _M_AMD64
3656 return ExtendedPC((address) context.Rip);
3657 #else
3658 return ExtendedPC((address) context.Eip);
3659 #endif
3660 } else {
3661 return ExtendedPC(NULL);
3662 }
3663 #endif
3664 }
3665
3666 // GetCurrentThreadId() returns DWORD
3667 intx os::current_thread_id() { return GetCurrentThreadId(); }
3668
3669 static int _initial_pid = 0;
3670
3671 int os::current_process_id()
3672 {
3673 return (_initial_pid ? _initial_pid : _getpid());
3674 }
3675
3676 int os::win32::_vm_page_size = 0;
3677 int os::win32::_vm_allocation_granularity = 0;
3678 int os::win32::_processor_type = 0;
3679 // Processor level is not available on non-NT systems, use vm_version instead
3680 int os::win32::_processor_level = 0;
3681 julong os::win32::_physical_memory = 0;
3682 size_t os::win32::_default_stack_size = 0;
3683
3684 intx os::win32::_os_thread_limit = 0;
3685 volatile intx os::win32::_os_thread_count = 0;
3686
3687 bool os::win32::_is_nt = false;
3688 bool os::win32::_is_windows_2003 = false;
3689 bool os::win32::_is_windows_server = false;
3690
3691 bool os::win32::_has_performance_count = 0;
3692
3693 void os::win32::initialize_system_info() {
3694 SYSTEM_INFO si;
3695 GetSystemInfo(&si);
3696 _vm_page_size = si.dwPageSize;
3697 _vm_allocation_granularity = si.dwAllocationGranularity;
3698 _processor_type = si.dwProcessorType;
3699 _processor_level = si.wProcessorLevel;
3700 set_processor_count(si.dwNumberOfProcessors);
3701
3702 MEMORYSTATUSEX ms;
3703 ms.dwLength = sizeof(ms);
3704
3705 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3706 // dwMemoryLoad (% of memory in use)
3707 GlobalMemoryStatusEx(&ms);
3708 _physical_memory = ms.ullTotalPhys;
3709
3710 OSVERSIONINFOEX oi;
3711 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3712 GetVersionEx((OSVERSIONINFO*)&oi);
3713 switch(oi.dwPlatformId) {
3714 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3715 case VER_PLATFORM_WIN32_NT:
3716 _is_nt = true;
3717 {
3718 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3719 if (os_vers == 5002) {
3720 _is_windows_2003 = true;
3721 }
3722 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3723 oi.wProductType == VER_NT_SERVER) {
3724 _is_windows_server = true;
3725 }
3726 }
3727 break;
3728 default: fatal("Unknown platform");
3729 }
3730
3731 _default_stack_size = os::current_stack_size();
3732 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3733 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3734 "stack size not a multiple of page size");
3735
3736 initialize_performance_counter();
3737
3738 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3739 // known to deadlock the system, if the VM issues to thread operations with
3740 // a too high frequency, e.g., such as changing the priorities.
3741 // The 6000 seems to work well - no deadlocks has been notices on the test
3742 // programs that we have seen experience this problem.
3743 if (!os::win32::is_nt()) {
3744 StarvationMonitorInterval = 6000;
3745 }
3746 }
3747
3748
3749 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3750 char path[MAX_PATH];
3751 DWORD size;
3752 DWORD pathLen = (DWORD)sizeof(path);
3753 HINSTANCE result = NULL;
3754
3755 // only allow library name without path component
3756 assert(strchr(name, '\\') == NULL, "path not allowed");
3757 assert(strchr(name, ':') == NULL, "path not allowed");
3758 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3759 jio_snprintf(ebuf, ebuflen,
3760 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3761 return NULL;
3762 }
3763
3764 // search system directory
3765 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3766 strcat(path, "\\");
3767 strcat(path, name);
3768 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3769 return result;
3770 }
3771 }
3772
3773 // try Windows directory
3774 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3775 strcat(path, "\\");
3776 strcat(path, name);
3777 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3778 return result;
3779 }
3780 }
3781
3782 jio_snprintf(ebuf, ebuflen,
3783 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3784 return NULL;
3785 }
3786
3787 void os::win32::setmode_streams() {
3788 _setmode(_fileno(stdin), _O_BINARY);
3789 _setmode(_fileno(stdout), _O_BINARY);
3790 _setmode(_fileno(stderr), _O_BINARY);
3791 }
3792
3793
3794 bool os::is_debugger_attached() {
3795 return IsDebuggerPresent() ? true : false;
3796 }
3797
3798
3799 void os::wait_for_keypress_at_exit(void) {
3800 if (PauseAtExit) {
3801 fprintf(stderr, "Press any key to continue...\n");
3802 fgetc(stdin);
3803 }
3804 }
3805
3806
3807 int os::message_box(const char* title, const char* message) {
3808 int result = MessageBox(NULL, message, title,
3809 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3810 return result == IDYES;
3811 }
3812
3813 int os::allocate_thread_local_storage() {
3814 return TlsAlloc();
3815 }
3816
3817
3818 void os::free_thread_local_storage(int index) {
3819 TlsFree(index);
3820 }
3821
3822
3823 void os::thread_local_storage_at_put(int index, void* value) {
3824 TlsSetValue(index, value);
3825 assert(thread_local_storage_at(index) == value, "Just checking");
3826 }
3827
3828
3829 void* os::thread_local_storage_at(int index) {
3830 return TlsGetValue(index);
3831 }
3832
3833
3834 #ifndef PRODUCT
3835 #ifndef _WIN64
3836 // Helpers to check whether NX protection is enabled
3837 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3838 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3839 pex->ExceptionRecord->NumberParameters > 0 &&
3840 pex->ExceptionRecord->ExceptionInformation[0] ==
3841 EXCEPTION_INFO_EXEC_VIOLATION) {
3842 return EXCEPTION_EXECUTE_HANDLER;
3843 }
3844 return EXCEPTION_CONTINUE_SEARCH;
3845 }
3846
3847 void nx_check_protection() {
3848 // If NX is enabled we'll get an exception calling into code on the stack
3849 char code[] = { (char)0xC3 }; // ret
3850 void *code_ptr = (void *)code;
3851 __try {
3852 __asm call code_ptr
3853 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3854 tty->print_raw_cr("NX protection detected.");
3855 }
3856 }
3857 #endif // _WIN64
3858 #endif // PRODUCT
3859
3860 // this is called _before_ the global arguments have been parsed
3861 void os::init(void) {
3862 _initial_pid = _getpid();
3863
3864 init_random(1234567);
3865
3866 win32::initialize_system_info();
3867 win32::setmode_streams();
3868 init_page_sizes((size_t) win32::vm_page_size());
3869
3870 // This may be overridden later when argument processing is done.
3871 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3872 os::win32::is_windows_2003());
3873
3874 // Initialize main_process and main_thread
3875 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3876 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3877 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3878 fatal("DuplicateHandle failed\n");
3879 }
3880 main_thread_id = (int) GetCurrentThreadId();
3881 }
3882
3883 // To install functions for atexit processing
3884 extern "C" {
3885 static void perfMemory_exit_helper() {
3886 perfMemory_exit();
3887 }
3888 }
3889
3890 static jint initSock();
3891
3892 // this is called _after_ the global arguments have been parsed
3893 jint os::init_2(void) {
3894 // Allocate a single page and mark it as readable for safepoint polling
3895 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3896 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3897
3898 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3899 guarantee( return_page != NULL, "Commit Failed for polling page");
3900
3901 os::set_polling_page( polling_page );
3902
3903 #ifndef PRODUCT
3904 if( Verbose && PrintMiscellaneous )
3905 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3906 #endif
3907
3908 if (!UseMembar) {
3909 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3910 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3911
3912 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3913 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3914
3915 os::set_memory_serialize_page( mem_serialize_page );
3916
3917 #ifndef PRODUCT
3918 if(Verbose && PrintMiscellaneous)
3919 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3920 #endif
3921 }
3922
3923 // Setup Windows Exceptions
3924
3925 // for debugging float code generation bugs
3926 if (ForceFloatExceptions) {
3927 #ifndef _WIN64
3928 static long fp_control_word = 0;
3929 __asm { fstcw fp_control_word }
3930 // see Intel PPro Manual, Vol. 2, p 7-16
3931 const long precision = 0x20;
3932 const long underflow = 0x10;
3933 const long overflow = 0x08;
3934 const long zero_div = 0x04;
3935 const long denorm = 0x02;
3936 const long invalid = 0x01;
3937 fp_control_word |= invalid;
3938 __asm { fldcw fp_control_word }
3939 #endif
3940 }
3941
3942 // If stack_commit_size is 0, windows will reserve the default size,
3943 // but only commit a small portion of it.
3944 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3945 size_t default_reserve_size = os::win32::default_stack_size();
3946 size_t actual_reserve_size = stack_commit_size;
3947 if (stack_commit_size < default_reserve_size) {
3948 // If stack_commit_size == 0, we want this too
3949 actual_reserve_size = default_reserve_size;
3950 }
3951
3952 // Check minimum allowable stack size for thread creation and to initialize
3953 // the java system classes, including StackOverflowError - depends on page
3954 // size. Add a page for compiler2 recursion in main thread.
3955 // Add in 2*BytesPerWord times page size to account for VM stack during
3956 // class initialization depending on 32 or 64 bit VM.
3957 size_t min_stack_allowed =
3958 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3959 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3960 if (actual_reserve_size < min_stack_allowed) {
3961 tty->print_cr("\nThe stack size specified is too small, "
3962 "Specify at least %dk",
3963 min_stack_allowed / K);
3964 return JNI_ERR;
3965 }
3966
3967 JavaThread::set_stack_size_at_create(stack_commit_size);
3968
3969 // Calculate theoretical max. size of Threads to guard gainst artifical
3970 // out-of-memory situations, where all available address-space has been
3971 // reserved by thread stacks.
3972 assert(actual_reserve_size != 0, "Must have a stack");
3973
3974 // Calculate the thread limit when we should start doing Virtual Memory
3975 // banging. Currently when the threads will have used all but 200Mb of space.
3976 //
3977 // TODO: consider performing a similar calculation for commit size instead
3978 // as reserve size, since on a 64-bit platform we'll run into that more
3979 // often than running out of virtual memory space. We can use the
3980 // lower value of the two calculations as the os_thread_limit.
3981 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3982 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3983
3984 // at exit methods are called in the reverse order of their registration.
3985 // there is no limit to the number of functions registered. atexit does
3986 // not set errno.
3987
3988 if (PerfAllowAtExitRegistration) {
3989 // only register atexit functions if PerfAllowAtExitRegistration is set.
3990 // atexit functions can be delayed until process exit time, which
3991 // can be problematic for embedded VM situations. Embedded VMs should
3992 // call DestroyJavaVM() to assure that VM resources are released.
3993
3994 // note: perfMemory_exit_helper atexit function may be removed in
3995 // the future if the appropriate cleanup code can be added to the
3996 // VM_Exit VMOperation's doit method.
3997 if (atexit(perfMemory_exit_helper) != 0) {
3998 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3999 }
4000 }
4001
4002 #ifndef _WIN64
4003 // Print something if NX is enabled (win32 on AMD64)
4004 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4005 #endif
4006
4007 // initialize thread priority policy
4008 prio_init();
4009
4010 if (UseNUMA && !ForceNUMA) {
4011 UseNUMA = false; // We don't fully support this yet
4012 }
4013
4014 if (UseNUMAInterleaving) {
4015 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4016 bool success = numa_interleaving_init();
4017 if (!success) UseNUMAInterleaving = false;
4018 }
4019
4020 if (initSock() != JNI_OK) {
4021 return JNI_ERR;
4022 }
4023
4024 return JNI_OK;
4025 }
4026
4027 void os::init_3(void) {
4028 return;
4029 }
4030
4031 // Mark the polling page as unreadable
4032 void os::make_polling_page_unreadable(void) {
4033 DWORD old_status;
4034 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4035 fatal("Could not disable polling page");
4036 };
4037
4038 // Mark the polling page as readable
4039 void os::make_polling_page_readable(void) {
4040 DWORD old_status;
4041 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4042 fatal("Could not enable polling page");
4043 };
4044
4045
4046 int os::stat(const char *path, struct stat *sbuf) {
4047 char pathbuf[MAX_PATH];
4048 if (strlen(path) > MAX_PATH - 1) {
4049 errno = ENAMETOOLONG;
4050 return -1;
4051 }
4052 os::native_path(strcpy(pathbuf, path));
4053 int ret = ::stat(pathbuf, sbuf);
4054 if (sbuf != NULL && UseUTCFileTimestamp) {
4055 // Fix for 6539723. st_mtime returned from stat() is dependent on
4056 // the system timezone and so can return different values for the
4057 // same file if/when daylight savings time changes. This adjustment
4058 // makes sure the same timestamp is returned regardless of the TZ.
4059 //
4060 // See:
4061 // http://msdn.microsoft.com/library/
4062 // default.asp?url=/library/en-us/sysinfo/base/
4063 // time_zone_information_str.asp
4064 // and
4065 // http://msdn.microsoft.com/library/default.asp?url=
4066 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4067 //
4068 // NOTE: there is a insidious bug here: If the timezone is changed
4069 // after the call to stat() but before 'GetTimeZoneInformation()', then
4070 // the adjustment we do here will be wrong and we'll return the wrong
4071 // value (which will likely end up creating an invalid class data
4072 // archive). Absent a better API for this, or some time zone locking
4073 // mechanism, we'll have to live with this risk.
4074 TIME_ZONE_INFORMATION tz;
4075 DWORD tzid = GetTimeZoneInformation(&tz);
4076 int daylightBias =
4077 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4078 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4079 }
4080 return ret;
4081 }
4082
4083
4084 #define FT2INT64(ft) \
4085 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4086
4087
4088 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4089 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4090 // of a thread.
4091 //
4092 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4093 // the fast estimate available on the platform.
4094
4095 // current_thread_cpu_time() is not optimized for Windows yet
4096 jlong os::current_thread_cpu_time() {
4097 // return user + sys since the cost is the same
4098 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4099 }
4100
4101 jlong os::thread_cpu_time(Thread* thread) {
4102 // consistent with what current_thread_cpu_time() returns.
4103 return os::thread_cpu_time(thread, true /* user+sys */);
4104 }
4105
4106 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4107 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4108 }
4109
4110 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4111 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4112 // If this function changes, os::is_thread_cpu_time_supported() should too
4113 if (os::win32::is_nt()) {
4114 FILETIME CreationTime;
4115 FILETIME ExitTime;
4116 FILETIME KernelTime;
4117 FILETIME UserTime;
4118
4119 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4120 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4121 return -1;
4122 else
4123 if (user_sys_cpu_time) {
4124 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4125 } else {
4126 return FT2INT64(UserTime) * 100;
4127 }
4128 } else {
4129 return (jlong) timeGetTime() * 1000000;
4130 }
4131 }
4132
4133 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4134 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4135 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4136 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4137 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4138 }
4139
4140 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4141 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4142 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4143 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4144 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4145 }
4146
4147 bool os::is_thread_cpu_time_supported() {
4148 // see os::thread_cpu_time
4149 if (os::win32::is_nt()) {
4150 FILETIME CreationTime;
4151 FILETIME ExitTime;
4152 FILETIME KernelTime;
4153 FILETIME UserTime;
4154
4155 if ( GetThreadTimes(GetCurrentThread(),
4156 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4157 return false;
4158 else
4159 return true;
4160 } else {
4161 return false;
4162 }
4163 }
4164
4165 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4166 // It does have primitives (PDH API) to get CPU usage and run queue length.
4167 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4168 // If we wanted to implement loadavg on Windows, we have a few options:
4169 //
4170 // a) Query CPU usage and run queue length and "fake" an answer by
4171 // returning the CPU usage if it's under 100%, and the run queue
4172 // length otherwise. It turns out that querying is pretty slow
4173 // on Windows, on the order of 200 microseconds on a fast machine.
4174 // Note that on the Windows the CPU usage value is the % usage
4175 // since the last time the API was called (and the first call
4176 // returns 100%), so we'd have to deal with that as well.
4177 //
4178 // b) Sample the "fake" answer using a sampling thread and store
4179 // the answer in a global variable. The call to loadavg would
4180 // just return the value of the global, avoiding the slow query.
4181 //
4182 // c) Sample a better answer using exponential decay to smooth the
4183 // value. This is basically the algorithm used by UNIX kernels.
4184 //
4185 // Note that sampling thread starvation could affect both (b) and (c).
4186 int os::loadavg(double loadavg[], int nelem) {
4187 return -1;
4188 }
4189
4190
4191 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4192 bool os::dont_yield() {
4193 return DontYieldALot;
4194 }
4195
4196 // This method is a slightly reworked copy of JDK's sysOpen
4197 // from src/windows/hpi/src/sys_api_md.c
4198
4199 int os::open(const char *path, int oflag, int mode) {
4200 char pathbuf[MAX_PATH];
4201
4202 if (strlen(path) > MAX_PATH - 1) {
4203 errno = ENAMETOOLONG;
4204 return -1;
4205 }
4206 os::native_path(strcpy(pathbuf, path));
4207 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4208 }
4209
4210 FILE* os::open(int fd, const char* mode) {
4211 return ::_fdopen(fd, mode);
4212 }
4213
4214 // Is a (classpath) directory empty?
4215 bool os::dir_is_empty(const char* path) {
4216 WIN32_FIND_DATA fd;
4217 HANDLE f = FindFirstFile(path, &fd);
4218 if (f == INVALID_HANDLE_VALUE) {
4219 return true;
4220 }
4221 FindClose(f);
4222 return false;
4223 }
4224
4225 // create binary file, rewriting existing file if required
4226 int os::create_binary_file(const char* path, bool rewrite_existing) {
4227 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4228 if (!rewrite_existing) {
4229 oflags |= _O_EXCL;
4230 }
4231 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4232 }
4233
4234 // return current position of file pointer
4235 jlong os::current_file_offset(int fd) {
4236 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4237 }
4238
4239 // move file pointer to the specified offset
4240 jlong os::seek_to_file_offset(int fd, jlong offset) {
4241 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4242 }
4243
4244
4245 jlong os::lseek(int fd, jlong offset, int whence) {
4246 return (jlong) ::_lseeki64(fd, offset, whence);
4247 }
4248
4249 // This method is a slightly reworked copy of JDK's sysNativePath
4250 // from src/windows/hpi/src/path_md.c
4251
4252 /* Convert a pathname to native format. On win32, this involves forcing all
4253 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4254 sometimes rejects '/') and removing redundant separators. The input path is
4255 assumed to have been converted into the character encoding used by the local
4256 system. Because this might be a double-byte encoding, care is taken to
4257 treat double-byte lead characters correctly.
4258
4259 This procedure modifies the given path in place, as the result is never
4260 longer than the original. There is no error return; this operation always
4261 succeeds. */
4262 char * os::native_path(char *path) {
4263 char *src = path, *dst = path, *end = path;
4264 char *colon = NULL; /* If a drive specifier is found, this will
4265 point to the colon following the drive
4266 letter */
4267
4268 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4269 assert(((!::IsDBCSLeadByte('/'))
4270 && (!::IsDBCSLeadByte('\\'))
4271 && (!::IsDBCSLeadByte(':'))),
4272 "Illegal lead byte");
4273
4274 /* Check for leading separators */
4275 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4276 while (isfilesep(*src)) {
4277 src++;
4278 }
4279
4280 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4281 /* Remove leading separators if followed by drive specifier. This
4282 hack is necessary to support file URLs containing drive
4283 specifiers (e.g., "file://c:/path"). As a side effect,
4284 "/c:/path" can be used as an alternative to "c:/path". */
4285 *dst++ = *src++;
4286 colon = dst;
4287 *dst++ = ':';
4288 src++;
4289 } else {
4290 src = path;
4291 if (isfilesep(src[0]) && isfilesep(src[1])) {
4292 /* UNC pathname: Retain first separator; leave src pointed at
4293 second separator so that further separators will be collapsed
4294 into the second separator. The result will be a pathname
4295 beginning with "\\\\" followed (most likely) by a host name. */
4296 src = dst = path + 1;
4297 path[0] = '\\'; /* Force first separator to '\\' */
4298 }
4299 }
4300
4301 end = dst;
4302
4303 /* Remove redundant separators from remainder of path, forcing all
4304 separators to be '\\' rather than '/'. Also, single byte space
4305 characters are removed from the end of the path because those
4306 are not legal ending characters on this operating system.
4307 */
4308 while (*src != '\0') {
4309 if (isfilesep(*src)) {
4310 *dst++ = '\\'; src++;
4311 while (isfilesep(*src)) src++;
4312 if (*src == '\0') {
4313 /* Check for trailing separator */
4314 end = dst;
4315 if (colon == dst - 2) break; /* "z:\\" */
4316 if (dst == path + 1) break; /* "\\" */
4317 if (dst == path + 2 && isfilesep(path[0])) {
4318 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4319 beginning of a UNC pathname. Even though it is not, by
4320 itself, a valid UNC pathname, we leave it as is in order
4321 to be consistent with the path canonicalizer as well
4322 as the win32 APIs, which treat this case as an invalid
4323 UNC pathname rather than as an alias for the root
4324 directory of the current drive. */
4325 break;
4326 }
4327 end = --dst; /* Path does not denote a root directory, so
4328 remove trailing separator */
4329 break;
4330 }
4331 end = dst;
4332 } else {
4333 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4334 *dst++ = *src++;
4335 if (*src) *dst++ = *src++;
4336 end = dst;
4337 } else { /* Copy a single-byte character */
4338 char c = *src++;
4339 *dst++ = c;
4340 /* Space is not a legal ending character */
4341 if (c != ' ') end = dst;
4342 }
4343 }
4344 }
4345
4346 *end = '\0';
4347
4348 /* For "z:", add "." to work around a bug in the C runtime library */
4349 if (colon == dst - 1) {
4350 path[2] = '.';
4351 path[3] = '\0';
4352 }
4353
4354 return path;
4355 }
4356
4357 // This code is a copy of JDK's sysSetLength
4358 // from src/windows/hpi/src/sys_api_md.c
4359
4360 int os::ftruncate(int fd, jlong length) {
4361 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4362 long high = (long)(length >> 32);
4363 DWORD ret;
4364
4365 if (h == (HANDLE)(-1)) {
4366 return -1;
4367 }
4368
4369 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4370 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4371 return -1;
4372 }
4373
4374 if (::SetEndOfFile(h) == FALSE) {
4375 return -1;
4376 }
4377
4378 return 0;
4379 }
4380
4381
4382 // This code is a copy of JDK's sysSync
4383 // from src/windows/hpi/src/sys_api_md.c
4384 // except for the legacy workaround for a bug in Win 98
4385
4386 int os::fsync(int fd) {
4387 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4388
4389 if ( (!::FlushFileBuffers(handle)) &&
4390 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4391 /* from winerror.h */
4392 return -1;
4393 }
4394 return 0;
4395 }
4396
4397 static int nonSeekAvailable(int, long *);
4398 static int stdinAvailable(int, long *);
4399
4400 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4401 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4402
4403 // This code is a copy of JDK's sysAvailable
4404 // from src/windows/hpi/src/sys_api_md.c
4405
4406 int os::available(int fd, jlong *bytes) {
4407 jlong cur, end;
4408 struct _stati64 stbuf64;
4409
4410 if (::_fstati64(fd, &stbuf64) >= 0) {
4411 int mode = stbuf64.st_mode;
4412 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4413 int ret;
4414 long lpbytes;
4415 if (fd == 0) {
4416 ret = stdinAvailable(fd, &lpbytes);
4417 } else {
4418 ret = nonSeekAvailable(fd, &lpbytes);
4419 }
4420 (*bytes) = (jlong)(lpbytes);
4421 return ret;
4422 }
4423 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4424 return FALSE;
4425 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4426 return FALSE;
4427 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4428 return FALSE;
4429 }
4430 *bytes = end - cur;
4431 return TRUE;
4432 } else {
4433 return FALSE;
4434 }
4435 }
4436
4437 // This code is a copy of JDK's nonSeekAvailable
4438 // from src/windows/hpi/src/sys_api_md.c
4439
4440 static int nonSeekAvailable(int fd, long *pbytes) {
4441 /* This is used for available on non-seekable devices
4442 * (like both named and anonymous pipes, such as pipes
4443 * connected to an exec'd process).
4444 * Standard Input is a special case.
4445 *
4446 */
4447 HANDLE han;
4448
4449 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4450 return FALSE;
4451 }
4452
4453 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4454 /* PeekNamedPipe fails when at EOF. In that case we
4455 * simply make *pbytes = 0 which is consistent with the
4456 * behavior we get on Solaris when an fd is at EOF.
4457 * The only alternative is to raise an Exception,
4458 * which isn't really warranted.
4459 */
4460 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4461 return FALSE;
4462 }
4463 *pbytes = 0;
4464 }
4465 return TRUE;
4466 }
4467
4468 #define MAX_INPUT_EVENTS 2000
4469
4470 // This code is a copy of JDK's stdinAvailable
4471 // from src/windows/hpi/src/sys_api_md.c
4472
4473 static int stdinAvailable(int fd, long *pbytes) {
4474 HANDLE han;
4475 DWORD numEventsRead = 0; /* Number of events read from buffer */
4476 DWORD numEvents = 0; /* Number of events in buffer */
4477 DWORD i = 0; /* Loop index */
4478 DWORD curLength = 0; /* Position marker */
4479 DWORD actualLength = 0; /* Number of bytes readable */
4480 BOOL error = FALSE; /* Error holder */
4481 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4482
4483 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4484 return FALSE;
4485 }
4486
4487 /* Construct an array of input records in the console buffer */
4488 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4489 if (error == 0) {
4490 return nonSeekAvailable(fd, pbytes);
4491 }
4492
4493 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4494 if (numEvents > MAX_INPUT_EVENTS) {
4495 numEvents = MAX_INPUT_EVENTS;
4496 }
4497
4498 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4499 if (lpBuffer == NULL) {
4500 return FALSE;
4501 }
4502
4503 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4504 if (error == 0) {
4505 os::free(lpBuffer, mtInternal);
4506 return FALSE;
4507 }
4508
4509 /* Examine input records for the number of bytes available */
4510 for(i=0; i<numEvents; i++) {
4511 if (lpBuffer[i].EventType == KEY_EVENT) {
4512
4513 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4514 &(lpBuffer[i].Event);
4515 if (keyRecord->bKeyDown == TRUE) {
4516 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4517 curLength++;
4518 if (*keyPressed == '\r') {
4519 actualLength = curLength;
4520 }
4521 }
4522 }
4523 }
4524
4525 if(lpBuffer != NULL) {
4526 os::free(lpBuffer, mtInternal);
4527 }
4528
4529 *pbytes = (long) actualLength;
4530 return TRUE;
4531 }
4532
4533 // Map a block of memory.
4534 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4535 char *addr, size_t bytes, bool read_only,
4536 bool allow_exec) {
4537 HANDLE hFile;
4538 char* base;
4539
4540 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4541 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4542 if (hFile == NULL) {
4543 if (PrintMiscellaneous && Verbose) {
4544 DWORD err = GetLastError();
4545 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4546 }
4547 return NULL;
4548 }
4549
4550 if (allow_exec) {
4551 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4552 // unless it comes from a PE image (which the shared archive is not.)
4553 // Even VirtualProtect refuses to give execute access to mapped memory
4554 // that was not previously executable.
4555 //
4556 // Instead, stick the executable region in anonymous memory. Yuck.
4557 // Penalty is that ~4 pages will not be shareable - in the future
4558 // we might consider DLLizing the shared archive with a proper PE
4559 // header so that mapping executable + sharing is possible.
4560
4561 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4562 PAGE_READWRITE);
4563 if (base == NULL) {
4564 if (PrintMiscellaneous && Verbose) {
4565 DWORD err = GetLastError();
4566 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4567 }
4568 CloseHandle(hFile);
4569 return NULL;
4570 }
4571
4572 DWORD bytes_read;
4573 OVERLAPPED overlapped;
4574 overlapped.Offset = (DWORD)file_offset;
4575 overlapped.OffsetHigh = 0;
4576 overlapped.hEvent = NULL;
4577 // ReadFile guarantees that if the return value is true, the requested
4578 // number of bytes were read before returning.
4579 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4580 if (!res) {
4581 if (PrintMiscellaneous && Verbose) {
4582 DWORD err = GetLastError();
4583 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4584 }
4585 release_memory(base, bytes);
4586 CloseHandle(hFile);
4587 return NULL;
4588 }
4589 } else {
4590 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4591 NULL /*file_name*/);
4592 if (hMap == NULL) {
4593 if (PrintMiscellaneous && Verbose) {
4594 DWORD err = GetLastError();
4595 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4596 }
4597 CloseHandle(hFile);
4598 return NULL;
4599 }
4600
4601 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4602 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4603 (DWORD)bytes, addr);
4604 if (base == NULL) {
4605 if (PrintMiscellaneous && Verbose) {
4606 DWORD err = GetLastError();
4607 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4608 }
4609 CloseHandle(hMap);
4610 CloseHandle(hFile);
4611 return NULL;
4612 }
4613
4614 if (CloseHandle(hMap) == 0) {
4615 if (PrintMiscellaneous && Verbose) {
4616 DWORD err = GetLastError();
4617 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4618 }
4619 CloseHandle(hFile);
4620 return base;
4621 }
4622 }
4623
4624 if (allow_exec) {
4625 DWORD old_protect;
4626 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4627 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4628
4629 if (!res) {
4630 if (PrintMiscellaneous && Verbose) {
4631 DWORD err = GetLastError();
4632 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4633 }
4634 // Don't consider this a hard error, on IA32 even if the
4635 // VirtualProtect fails, we should still be able to execute
4636 CloseHandle(hFile);
4637 return base;
4638 }
4639 }
4640
4641 if (CloseHandle(hFile) == 0) {
4642 if (PrintMiscellaneous && Verbose) {
4643 DWORD err = GetLastError();
4644 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4645 }
4646 return base;
4647 }
4648
4649 return base;
4650 }
4651
4652
4653 // Remap a block of memory.
4654 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4655 char *addr, size_t bytes, bool read_only,
4656 bool allow_exec) {
4657 // This OS does not allow existing memory maps to be remapped so we
4658 // have to unmap the memory before we remap it.
4659 if (!os::unmap_memory(addr, bytes)) {
4660 return NULL;
4661 }
4662
4663 // There is a very small theoretical window between the unmap_memory()
4664 // call above and the map_memory() call below where a thread in native
4665 // code may be able to access an address that is no longer mapped.
4666
4667 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4668 read_only, allow_exec);
4669 }
4670
4671
4672 // Unmap a block of memory.
4673 // Returns true=success, otherwise false.
4674
4675 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4676 BOOL result = UnmapViewOfFile(addr);
4677 if (result == 0) {
4678 if (PrintMiscellaneous && Verbose) {
4679 DWORD err = GetLastError();
4680 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4681 }
4682 return false;
4683 }
4684 return true;
4685 }
4686
4687 void os::pause() {
4688 char filename[MAX_PATH];
4689 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4690 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4691 } else {
4692 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4693 }
4694
4695 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4696 if (fd != -1) {
4697 struct stat buf;
4698 ::close(fd);
4699 while (::stat(filename, &buf) == 0) {
4700 Sleep(100);
4701 }
4702 } else {
4703 jio_fprintf(stderr,
4704 "Could not open pause file '%s', continuing immediately.\n", filename);
4705 }
4706 }
4707
4708 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4709 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4710 }
4711
4712 /*
4713 * See the caveats for this class in os_windows.hpp
4714 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4715 * into this method and returns false. If no OS EXCEPTION was raised, returns
4716 * true.
4717 * The callback is supposed to provide the method that should be protected.
4718 */
4719 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4720 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4721 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4722 "crash_protection already set?");
4723
4724 bool success = true;
4725 __try {
4726 WatcherThread::watcher_thread()->set_crash_protection(this);
4727 cb.call();
4728 } __except(EXCEPTION_EXECUTE_HANDLER) {
4729 // only for protection, nothing to do
4730 success = false;
4731 }
4732 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4733 return success;
4734 }
4735
4736 // An Event wraps a win32 "CreateEvent" kernel handle.
4737 //
4738 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4739 //
4740 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4741 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4742 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4743 // In addition, an unpark() operation might fetch the handle field, but the
4744 // event could recycle between the fetch and the SetEvent() operation.
4745 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4746 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4747 // on an stale but recycled handle would be harmless, but in practice this might
4748 // confuse other non-Sun code, so it's not a viable approach.
4749 //
4750 // 2: Once a win32 event handle is associated with an Event, it remains associated
4751 // with the Event. The event handle is never closed. This could be construed
4752 // as handle leakage, but only up to the maximum # of threads that have been extant
4753 // at any one time. This shouldn't be an issue, as windows platforms typically
4754 // permit a process to have hundreds of thousands of open handles.
4755 //
4756 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4757 // and release unused handles.
4758 //
4759 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4760 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4761 //
4762 // 5. Use an RCU-like mechanism (Read-Copy Update).
4763 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4764 //
4765 // We use (2).
4766 //
4767 // TODO-FIXME:
4768 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4769 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4770 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4771 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4772 // into a single win32 CreateEvent() handle.
4773 //
4774 // _Event transitions in park()
4775 // -1 => -1 : illegal
4776 // 1 => 0 : pass - return immediately
4777 // 0 => -1 : block
4778 //
4779 // _Event serves as a restricted-range semaphore :
4780 // -1 : thread is blocked
4781 // 0 : neutral - thread is running or ready
4782 // 1 : signaled - thread is running or ready
4783 //
4784 // Another possible encoding of _Event would be
4785 // with explicit "PARKED" and "SIGNALED" bits.
4786
4787 int os::PlatformEvent::park (jlong Millis) {
4788 guarantee (_ParkHandle != NULL , "Invariant") ;
4789 guarantee (Millis > 0 , "Invariant") ;
4790 int v ;
4791
4792 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4793 // the initial park() operation.
4794
4795 for (;;) {
4796 v = _Event ;
4797 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4798 }
4799 guarantee ((v == 0) || (v == 1), "invariant") ;
4800 if (v != 0) return OS_OK ;
4801
4802 // Do this the hard way by blocking ...
4803 // TODO: consider a brief spin here, gated on the success of recent
4804 // spin attempts by this thread.
4805 //
4806 // We decompose long timeouts into series of shorter timed waits.
4807 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4808 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4809 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4810 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4811 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4812 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4813 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4814 // for the already waited time. This policy does not admit any new outcomes.
4815 // In the future, however, we might want to track the accumulated wait time and
4816 // adjust Millis accordingly if we encounter a spurious wakeup.
4817
4818 const int MAXTIMEOUT = 0x10000000 ;
4819 DWORD rv = WAIT_TIMEOUT ;
4820 while (_Event < 0 && Millis > 0) {
4821 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4822 if (Millis > MAXTIMEOUT) {
4823 prd = MAXTIMEOUT ;
4824 }
4825 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4826 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4827 if (rv == WAIT_TIMEOUT) {
4828 Millis -= prd ;
4829 }
4830 }
4831 v = _Event ;
4832 _Event = 0 ;
4833 // see comment at end of os::PlatformEvent::park() below:
4834 OrderAccess::fence() ;
4835 // If we encounter a nearly simultanous timeout expiry and unpark()
4836 // we return OS_OK indicating we awoke via unpark().
4837 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4838 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4839 }
4840
4841 void os::PlatformEvent::park () {
4842 guarantee (_ParkHandle != NULL, "Invariant") ;
4843 // Invariant: Only the thread associated with the Event/PlatformEvent
4844 // may call park().
4845 int v ;
4846 for (;;) {
4847 v = _Event ;
4848 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4849 }
4850 guarantee ((v == 0) || (v == 1), "invariant") ;
4851 if (v != 0) return ;
4852
4853 // Do this the hard way by blocking ...
4854 // TODO: consider a brief spin here, gated on the success of recent
4855 // spin attempts by this thread.
4856 while (_Event < 0) {
4857 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4858 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4859 }
4860
4861 // Usually we'll find _Event == 0 at this point, but as
4862 // an optional optimization we clear it, just in case can
4863 // multiple unpark() operations drove _Event up to 1.
4864 _Event = 0 ;
4865 OrderAccess::fence() ;
4866 guarantee (_Event >= 0, "invariant") ;
4867 }
4868
4869 void os::PlatformEvent::unpark() {
4870 guarantee (_ParkHandle != NULL, "Invariant") ;
4871
4872 // Transitions for _Event:
4873 // 0 :=> 1
4874 // 1 :=> 1
4875 // -1 :=> either 0 or 1; must signal target thread
4876 // That is, we can safely transition _Event from -1 to either
4877 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4878 // unpark() calls.
4879 // See also: "Semaphores in Plan 9" by Mullender & Cox
4880 //
4881 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4882 // that it will take two back-to-back park() calls for the owning
4883 // thread to block. This has the benefit of forcing a spurious return
4884 // from the first park() call after an unpark() call which will help
4885 // shake out uses of park() and unpark() without condition variables.
4886
4887 if (Atomic::xchg(1, &_Event) >= 0) return;
4888
4889 ::SetEvent(_ParkHandle);
4890 }
4891
4892
4893 // JSR166
4894 // -------------------------------------------------------
4895
4896 /*
4897 * The Windows implementation of Park is very straightforward: Basic
4898 * operations on Win32 Events turn out to have the right semantics to
4899 * use them directly. We opportunistically resuse the event inherited
4900 * from Monitor.
4901 */
4902
4903
4904 void Parker::park(bool isAbsolute, jlong time) {
4905 guarantee (_ParkEvent != NULL, "invariant") ;
4906 // First, demultiplex/decode time arguments
4907 if (time < 0) { // don't wait
4908 return;
4909 }
4910 else if (time == 0 && !isAbsolute) {
4911 time = INFINITE;
4912 }
4913 else if (isAbsolute) {
4914 time -= os::javaTimeMillis(); // convert to relative time
4915 if (time <= 0) // already elapsed
4916 return;
4917 }
4918 else { // relative
4919 time /= 1000000; // Must coarsen from nanos to millis
4920 if (time == 0) // Wait for the minimal time unit if zero
4921 time = 1;
4922 }
4923
4924 JavaThread* thread = (JavaThread*)(Thread::current());
4925 assert(thread->is_Java_thread(), "Must be JavaThread");
4926 JavaThread *jt = (JavaThread *)thread;
4927
4928 // Don't wait if interrupted or already triggered
4929 if (Thread::is_interrupted(thread, false) ||
4930 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4931 ResetEvent(_ParkEvent);
4932 return;
4933 }
4934 else {
4935 ThreadBlockInVM tbivm(jt);
4936 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4937 jt->set_suspend_equivalent();
4938
4939 WaitForSingleObject(_ParkEvent, time);
4940 ResetEvent(_ParkEvent);
4941
4942 // If externally suspended while waiting, re-suspend
4943 if (jt->handle_special_suspend_equivalent_condition()) {
4944 jt->java_suspend_self();
4945 }
4946 }
4947 }
4948
4949 void Parker::unpark() {
4950 guarantee (_ParkEvent != NULL, "invariant") ;
4951 SetEvent(_ParkEvent);
4952 }
4953
4954 // Run the specified command in a separate process. Return its exit value,
4955 // or -1 on failure (e.g. can't create a new process).
4956 int os::fork_and_exec(char* cmd) {
4957 STARTUPINFO si;
4958 PROCESS_INFORMATION pi;
4959
4960 memset(&si, 0, sizeof(si));
4961 si.cb = sizeof(si);
4962 memset(&pi, 0, sizeof(pi));
4963 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4964 cmd, // command line
4965 NULL, // process security attribute
4966 NULL, // thread security attribute
4967 TRUE, // inherits system handles
4968 0, // no creation flags
4969 NULL, // use parent's environment block
4970 NULL, // use parent's starting directory
4971 &si, // (in) startup information
4972 &pi); // (out) process information
4973
4974 if (rslt) {
4975 // Wait until child process exits.
4976 WaitForSingleObject(pi.hProcess, INFINITE);
4977
4978 DWORD exit_code;
4979 GetExitCodeProcess(pi.hProcess, &exit_code);
4980
4981 // Close process and thread handles.
4982 CloseHandle(pi.hProcess);
4983 CloseHandle(pi.hThread);
4984
4985 return (int)exit_code;
4986 } else {
4987 return -1;
4988 }
4989 }
4990
4991 //--------------------------------------------------------------------------------------------------
4992 // Non-product code
4993
4994 static int mallocDebugIntervalCounter = 0;
4995 static int mallocDebugCounter = 0;
4996 bool os::check_heap(bool force) {
4997 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4998 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4999 // Note: HeapValidate executes two hardware breakpoints when it finds something
5000 // wrong; at these points, eax contains the address of the offending block (I think).
5001 // To get to the exlicit error message(s) below, just continue twice.
5002 HANDLE heap = GetProcessHeap();
5003
5004 // If we fail to lock the heap, then gflags.exe has been used
5005 // or some other special heap flag has been set that prevents
5006 // locking. We don't try to walk a heap we can't lock.
5007 if (HeapLock(heap) != 0) {
5008 PROCESS_HEAP_ENTRY phe;
5009 phe.lpData = NULL;
5010 while (HeapWalk(heap, &phe) != 0) {
5011 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5012 !HeapValidate(heap, 0, phe.lpData)) {
5013 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5014 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5015 fatal("corrupted C heap");
5016 }
5017 }
5018 DWORD err = GetLastError();
5019 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5020 fatal(err_msg("heap walk aborted with error %d", err));
5021 }
5022 HeapUnlock(heap);
5023 }
5024 mallocDebugIntervalCounter = 0;
5025 }
5026 return true;
5027 }
5028
5029
5030 bool os::find(address addr, outputStream* st) {
5031 // Nothing yet
5032 return false;
5033 }
5034
5035 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5036 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5037
5038 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5039 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5040 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5041 address addr = (address) exceptionRecord->ExceptionInformation[1];
5042
5043 if (os::is_memory_serialize_page(thread, addr))
5044 return EXCEPTION_CONTINUE_EXECUTION;
5045 }
5046
5047 return EXCEPTION_CONTINUE_SEARCH;
5048 }
5049
5050 // We don't build a headless jre for Windows
5051 bool os::is_headless_jre() { return false; }
5052
5053 static jint initSock() {
5054 WSADATA wsadata;
5055
5056 if (!os::WinSock2Dll::WinSock2Available()) {
5057 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5058 ::GetLastError());
5059 return JNI_ERR;
5060 }
5061
5062 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5063 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5064 ::GetLastError());
5065 return JNI_ERR;
5066 }
5067 return JNI_OK;
5068 }
5069
5070 struct hostent* os::get_host_by_name(char* name) {
5071 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5072 }
5073
5074 int os::socket_close(int fd) {
5075 return ::closesocket(fd);
5076 }
5077
5078 int os::socket_available(int fd, jint *pbytes) {
5079 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5080 return (ret < 0) ? 0 : 1;
5081 }
5082
5083 int os::socket(int domain, int type, int protocol) {
5084 return ::socket(domain, type, protocol);
5085 }
5086
5087 int os::listen(int fd, int count) {
5088 return ::listen(fd, count);
5089 }
5090
5091 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5092 return ::connect(fd, him, len);
5093 }
5094
5095 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5096 return ::accept(fd, him, len);
5097 }
5098
5099 int os::sendto(int fd, char* buf, size_t len, uint flags,
5100 struct sockaddr* to, socklen_t tolen) {
5101
5102 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5103 }
5104
5105 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5106 sockaddr* from, socklen_t* fromlen) {
5107
5108 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5109 }
5110
5111 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5112 return ::recv(fd, buf, (int)nBytes, flags);
5113 }
5114
5115 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5116 return ::send(fd, buf, (int)nBytes, flags);
5117 }
5118
5119 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5120 return ::send(fd, buf, (int)nBytes, flags);
5121 }
5122
5123 int os::timeout(int fd, long timeout) {
5124 fd_set tbl;
5125 struct timeval t;
5126
5127 t.tv_sec = timeout / 1000;
5128 t.tv_usec = (timeout % 1000) * 1000;
5129
5130 tbl.fd_count = 1;
5131 tbl.fd_array[0] = fd;
5132
5133 return ::select(1, &tbl, 0, 0, &t);
5134 }
5135
5136 int os::get_host_name(char* name, int namelen) {
5137 return ::gethostname(name, namelen);
5138 }
5139
5140 int os::socket_shutdown(int fd, int howto) {
5141 return ::shutdown(fd, howto);
5142 }
5143
5144 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5145 return ::bind(fd, him, len);
5146 }
5147
5148 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5149 return ::getsockname(fd, him, len);
5150 }
5151
5152 int os::get_sock_opt(int fd, int level, int optname,
5153 char* optval, socklen_t* optlen) {
5154 return ::getsockopt(fd, level, optname, optval, optlen);
5155 }
5156
5157 int os::set_sock_opt(int fd, int level, int optname,
5158 const char* optval, socklen_t optlen) {
5159 return ::setsockopt(fd, level, optname, optval, optlen);
5160 }
5161
5162 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5163 #if defined(IA32)
5164 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5165 #elif defined (AMD64)
5166 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5167 #endif
5168
5169 // returns true if thread could be suspended,
5170 // false otherwise
5171 static bool do_suspend(HANDLE* h) {
5172 if (h != NULL) {
5173 if (SuspendThread(*h) != ~0) {
5174 return true;
5175 }
5176 }
5177 return false;
5178 }
5179
5180 // resume the thread
5181 // calling resume on an active thread is a no-op
5182 static void do_resume(HANDLE* h) {
5183 if (h != NULL) {
5184 ResumeThread(*h);
5185 }
5186 }
5187
5188 // retrieve a suspend/resume context capable handle
5189 // from the tid. Caller validates handle return value.
5190 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5191 if (h != NULL) {
5192 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5193 }
5194 }
5195
5196 //
5197 // Thread sampling implementation
5198 //
5199 void os::SuspendedThreadTask::internal_do_task() {
5200 CONTEXT ctxt;
5201 HANDLE h = NULL;
5202
5203 // get context capable handle for thread
5204 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5205
5206 // sanity
5207 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5208 return;
5209 }
5210
5211 // suspend the thread
5212 if (do_suspend(&h)) {
5213 ctxt.ContextFlags = sampling_context_flags;
5214 // get thread context
5215 GetThreadContext(h, &ctxt);
5216 SuspendedThreadTaskContext context(_thread, &ctxt);
5217 // pass context to Thread Sampling impl
5218 do_task(context);
5219 // resume thread
5220 do_resume(&h);
5221 }
5222
5223 // close handle
5224 CloseHandle(h);
5225 }
5226
5227
5228 // Kernel32 API
5229 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5230 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5231 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5232 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5233 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5234
5235 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5236 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5237 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5238 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5239 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5240
5241
5242 BOOL os::Kernel32Dll::initialized = FALSE;
5243 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5244 assert(initialized && _GetLargePageMinimum != NULL,
5245 "GetLargePageMinimumAvailable() not yet called");
5246 return _GetLargePageMinimum();
5247 }
5248
5249 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5250 if (!initialized) {
5251 initialize();
5252 }
5253 return _GetLargePageMinimum != NULL;
5254 }
5255
5256 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5257 if (!initialized) {
5258 initialize();
5259 }
5260 return _VirtualAllocExNuma != NULL;
5261 }
5262
5263 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5264 assert(initialized && _VirtualAllocExNuma != NULL,
5265 "NUMACallsAvailable() not yet called");
5266
5267 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5268 }
5269
5270 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5271 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5272 "NUMACallsAvailable() not yet called");
5273
5274 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5275 }
5276
5277 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5278 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5279 "NUMACallsAvailable() not yet called");
5280
5281 return _GetNumaNodeProcessorMask(node, proc_mask);
5282 }
5283
5284 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5285 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5286 if (!initialized) {
5287 initialize();
5288 }
5289
5290 if (_RtlCaptureStackBackTrace != NULL) {
5291 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5292 BackTrace, BackTraceHash);
5293 } else {
5294 return 0;
5295 }
5296 }
5297
5298 void os::Kernel32Dll::initializeCommon() {
5299 if (!initialized) {
5300 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5301 assert(handle != NULL, "Just check");
5302 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5303 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5304 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5305 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5306 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5307 initialized = TRUE;
5308 }
5309 }
5310
5311
5312
5313 #ifndef JDK6_OR_EARLIER
5314
5315 void os::Kernel32Dll::initialize() {
5316 initializeCommon();
5317 }
5318
5319
5320 // Kernel32 API
5321 inline BOOL os::Kernel32Dll::SwitchToThread() {
5322 return ::SwitchToThread();
5323 }
5324
5325 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5326 return true;
5327 }
5328
5329 // Help tools
5330 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5331 return true;
5332 }
5333
5334 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5335 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5336 }
5337
5338 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5339 return ::Module32First(hSnapshot, lpme);
5340 }
5341
5342 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5343 return ::Module32Next(hSnapshot, lpme);
5344 }
5345
5346
5347 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5348 return true;
5349 }
5350
5351 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5352 ::GetNativeSystemInfo(lpSystemInfo);
5353 }
5354
5355 // PSAPI API
5356 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5357 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5358 }
5359
5360 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5361 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5362 }
5363
5364 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5365 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5366 }
5367
5368 inline BOOL os::PSApiDll::PSApiAvailable() {
5369 return true;
5370 }
5371
5372
5373 // WinSock2 API
5374 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5375 return ::WSAStartup(wVersionRequested, lpWSAData);
5376 }
5377
5378 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5379 return ::gethostbyname(name);
5380 }
5381
5382 inline BOOL os::WinSock2Dll::WinSock2Available() {
5383 return true;
5384 }
5385
5386 // Advapi API
5387 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5388 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5389 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5390 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5391 BufferLength, PreviousState, ReturnLength);
5392 }
5393
5394 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5395 PHANDLE TokenHandle) {
5396 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5397 }
5398
5399 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5400 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5401 }
5402
5403 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5404 return true;
5405 }
5406
5407 void* os::get_default_process_handle() {
5408 return (void*)GetModuleHandle(NULL);
5409 }
5410
5411 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5412 // which is used to find statically linked in agents.
5413 // Additionally for windows, takes into account __stdcall names.
5414 // Parameters:
5415 // sym_name: Symbol in library we are looking for
5416 // lib_name: Name of library to look in, NULL for shared libs.
5417 // is_absolute_path == true if lib_name is absolute path to agent
5418 // such as "C:/a/b/L.dll"
5419 // == false if only the base name of the library is passed in
5420 // such as "L"
5421 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5422 bool is_absolute_path) {
5423 char *agent_entry_name;
5424 size_t len;
5425 size_t name_len;
5426 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5427 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5428 const char *start;
5429
5430 if (lib_name != NULL) {
5431 len = name_len = strlen(lib_name);
5432 if (is_absolute_path) {
5433 // Need to strip path, prefix and suffix
5434 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5435 lib_name = ++start;
5436 } else {
5437 // Need to check for drive prefix
5438 if ((start = strchr(lib_name, ':')) != NULL) {
5439 lib_name = ++start;
5440 }
5441 }
5442 if (len <= (prefix_len + suffix_len)) {
5443 return NULL;
5444 }
5445 lib_name += prefix_len;
5446 name_len = strlen(lib_name) - suffix_len;
5447 }
5448 }
5449 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5450 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5451 if (agent_entry_name == NULL) {
5452 return NULL;
5453 }
5454 if (lib_name != NULL) {
5455 const char *p = strrchr(sym_name, '@');
5456 if (p != NULL && p != sym_name) {
5457 // sym_name == _Agent_OnLoad@XX
5458 strncpy(agent_entry_name, sym_name, (p - sym_name));
5459 agent_entry_name[(p-sym_name)] = '\0';
5460 // agent_entry_name == _Agent_OnLoad
5461 strcat(agent_entry_name, "_");
5462 strncat(agent_entry_name, lib_name, name_len);
5463 strcat(agent_entry_name, p);
5464 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5465 } else {
5466 strcpy(agent_entry_name, sym_name);
5467 strcat(agent_entry_name, "_");
5468 strncat(agent_entry_name, lib_name, name_len);
5469 }
5470 } else {
5471 strcpy(agent_entry_name, sym_name);
5472 }
5473 return agent_entry_name;
5474 }
5475
5476 #else
5477 // Kernel32 API
5478 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5479 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5480 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5481 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5482 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5483
5484 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5485 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5486 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5487 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5488 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5489
5490 void os::Kernel32Dll::initialize() {
5491 if (!initialized) {
5492 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5493 assert(handle != NULL, "Just check");
5494
5495 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5496 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5497 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5498 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5499 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5500 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5501 initializeCommon(); // resolve the functions that always need resolving
5502
5503 initialized = TRUE;
5504 }
5505 }
5506
5507 BOOL os::Kernel32Dll::SwitchToThread() {
5508 assert(initialized && _SwitchToThread != NULL,
5509 "SwitchToThreadAvailable() not yet called");
5510 return _SwitchToThread();
5511 }
5512
5513
5514 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5515 if (!initialized) {
5516 initialize();
5517 }
5518 return _SwitchToThread != NULL;
5519 }
5520
5521 // Help tools
5522 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5523 if (!initialized) {
5524 initialize();
5525 }
5526 return _CreateToolhelp32Snapshot != NULL &&
5527 _Module32First != NULL &&
5528 _Module32Next != NULL;
5529 }
5530
5531 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5532 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5533 "HelpToolsAvailable() not yet called");
5534
5535 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5536 }
5537
5538 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5539 assert(initialized && _Module32First != NULL,
5540 "HelpToolsAvailable() not yet called");
5541
5542 return _Module32First(hSnapshot, lpme);
5543 }
5544
5545 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5546 assert(initialized && _Module32Next != NULL,
5547 "HelpToolsAvailable() not yet called");
5548
5549 return _Module32Next(hSnapshot, lpme);
5550 }
5551
5552
5553 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5554 if (!initialized) {
5555 initialize();
5556 }
5557 return _GetNativeSystemInfo != NULL;
5558 }
5559
5560 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5561 assert(initialized && _GetNativeSystemInfo != NULL,
5562 "GetNativeSystemInfoAvailable() not yet called");
5563
5564 _GetNativeSystemInfo(lpSystemInfo);
5565 }
5566
5567 // PSAPI API
5568
5569
5570 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5571 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5572 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5573
5574 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5575 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5576 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5577 BOOL os::PSApiDll::initialized = FALSE;
5578
5579 void os::PSApiDll::initialize() {
5580 if (!initialized) {
5581 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5582 if (handle != NULL) {
5583 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5584 "EnumProcessModules");
5585 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5586 "GetModuleFileNameExA");
5587 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5588 "GetModuleInformation");
5589 }
5590 initialized = TRUE;
5591 }
5592 }
5593
5594
5595
5596 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5597 assert(initialized && _EnumProcessModules != NULL,
5598 "PSApiAvailable() not yet called");
5599 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5600 }
5601
5602 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5603 assert(initialized && _GetModuleFileNameEx != NULL,
5604 "PSApiAvailable() not yet called");
5605 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5606 }
5607
5608 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5609 assert(initialized && _GetModuleInformation != NULL,
5610 "PSApiAvailable() not yet called");
5611 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5612 }
5613
5614 BOOL os::PSApiDll::PSApiAvailable() {
5615 if (!initialized) {
5616 initialize();
5617 }
5618 return _EnumProcessModules != NULL &&
5619 _GetModuleFileNameEx != NULL &&
5620 _GetModuleInformation != NULL;
5621 }
5622
5623
5624 // WinSock2 API
5625 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5626 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5627
5628 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5629 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5630 BOOL os::WinSock2Dll::initialized = FALSE;
5631
5632 void os::WinSock2Dll::initialize() {
5633 if (!initialized) {
5634 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5635 if (handle != NULL) {
5636 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5637 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5638 }
5639 initialized = TRUE;
5640 }
5641 }
5642
5643
5644 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5645 assert(initialized && _WSAStartup != NULL,
5646 "WinSock2Available() not yet called");
5647 return _WSAStartup(wVersionRequested, lpWSAData);
5648 }
5649
5650 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5651 assert(initialized && _gethostbyname != NULL,
5652 "WinSock2Available() not yet called");
5653 return _gethostbyname(name);
5654 }
5655
5656 BOOL os::WinSock2Dll::WinSock2Available() {
5657 if (!initialized) {
5658 initialize();
5659 }
5660 return _WSAStartup != NULL &&
5661 _gethostbyname != NULL;
5662 }
5663
5664 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5665 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5666 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5667
5668 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5669 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5670 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5671 BOOL os::Advapi32Dll::initialized = FALSE;
5672
5673 void os::Advapi32Dll::initialize() {
5674 if (!initialized) {
5675 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5676 if (handle != NULL) {
5677 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5678 "AdjustTokenPrivileges");
5679 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5680 "OpenProcessToken");
5681 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5682 "LookupPrivilegeValueA");
5683 }
5684 initialized = TRUE;
5685 }
5686 }
5687
5688 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5689 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5690 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5691 assert(initialized && _AdjustTokenPrivileges != NULL,
5692 "AdvapiAvailable() not yet called");
5693 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5694 BufferLength, PreviousState, ReturnLength);
5695 }
5696
5697 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5698 PHANDLE TokenHandle) {
5699 assert(initialized && _OpenProcessToken != NULL,
5700 "AdvapiAvailable() not yet called");
5701 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5702 }
5703
5704 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5705 assert(initialized && _LookupPrivilegeValue != NULL,
5706 "AdvapiAvailable() not yet called");
5707 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5708 }
5709
5710 BOOL os::Advapi32Dll::AdvapiAvailable() {
5711 if (!initialized) {
5712 initialize();
5713 }
5714 return _AdjustTokenPrivileges != NULL &&
5715 _OpenProcessToken != NULL &&
5716 _LookupPrivilegeValue != NULL;
5717 }
5718
5719 #endif
5720
5721 #ifndef PRODUCT
5722
5723 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5724 // contiguous memory block at a particular address.
5725 // The test first tries to find a good approximate address to allocate at by using the same
5726 // method to allocate some memory at any address. The test then tries to allocate memory in
5727 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5728 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5729 // the previously allocated memory is available for allocation. The only actual failure
5730 // that is reported is when the test tries to allocate at a particular location but gets a
5731 // different valid one. A NULL return value at this point is not considered an error but may
5732 // be legitimate.
5733 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5734 void TestReserveMemorySpecial_test() {
5735 if (!UseLargePages) {
5736 if (VerboseInternalVMTests) {
5737 gclog_or_tty->print("Skipping test because large pages are disabled");
5738 }
5739 return;
5740 }
5741 // save current value of globals
5742 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5743 bool old_use_numa_interleaving = UseNUMAInterleaving;
5744
5745 // set globals to make sure we hit the correct code path
5746 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5747
5748 // do an allocation at an address selected by the OS to get a good one.
5749 const size_t large_allocation_size = os::large_page_size() * 4;
5750 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5751 if (result == NULL) {
5752 if (VerboseInternalVMTests) {
5753 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5754 large_allocation_size);
5755 }
5756 } else {
5757 os::release_memory_special(result, large_allocation_size);
5758
5759 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5760 // we managed to get it once.
5761 const size_t expected_allocation_size = os::large_page_size();
5762 char* expected_location = result + os::large_page_size();
5763 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5764 if (actual_location == NULL) {
5765 if (VerboseInternalVMTests) {
5766 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5767 expected_location, large_allocation_size);
5768 }
5769 } else {
5770 // release memory
5771 os::release_memory_special(actual_location, expected_allocation_size);
5772 // only now check, after releasing any memory to avoid any leaks.
5773 assert(actual_location == expected_location,
5774 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5775 expected_location, expected_allocation_size, actual_location));
5776 }
5777 }
5778
5779 // restore globals
5780 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5781 UseNUMAInterleaving = old_use_numa_interleaving;
5782 }
5783 #endif // PRODUCT
5784