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