1 /*
2 * Copyright (c) 1997, 2015, 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 Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.inline.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.inline.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "semaphore_windows.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/memTracker.hpp"
69 #include "services/runtimeService.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/vmError.hpp"
75
76 #ifdef _DEBUG
77 #include <crtdbg.h>
78 #endif
79
80
81 #include <windows.h>
82 #include <sys/types.h>
83 #include <sys/stat.h>
84 #include <sys/timeb.h>
85 #include <objidl.h>
86 #include <shlobj.h>
87
88 #include <malloc.h>
89 #include <signal.h>
90 #include <direct.h>
91 #include <errno.h>
92 #include <fcntl.h>
93 #include <io.h>
94 #include <process.h> // For _beginthreadex(), _endthreadex()
95 #include <imagehlp.h> // For os::dll_address_to_function_name
96 // for enumerating dll libraries
97 #include <vdmdbg.h>
98
99 // for timer info max values which include all bits
100 #define ALL_64_BITS CONST64(-1)
101
102 // For DLL loading/load error detection
103 // Values of PE COFF
104 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
105 #define IMAGE_FILE_SIGNATURE_LENGTH 4
106
107 static HANDLE main_process;
108 static HANDLE main_thread;
109 static int main_thread_id;
110
111 static FILETIME process_creation_time;
112 static FILETIME process_exit_time;
113 static FILETIME process_user_time;
114 static FILETIME process_kernel_time;
115
116 #ifdef _M_IA64
117 #define __CPU__ ia64
118 #else
119 #ifdef _M_AMD64
120 #define __CPU__ amd64
121 #else
122 #define __CPU__ i486
123 #endif
124 #endif
125
126 // save DLL module handle, used by GetModuleFileName
127
128 HINSTANCE vm_lib_handle;
129
130 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
131 switch (reason) {
132 case DLL_PROCESS_ATTACH:
133 vm_lib_handle = hinst;
134 if (ForceTimeHighResolution) {
135 timeBeginPeriod(1L);
136 }
137 break;
138 case DLL_PROCESS_DETACH:
139 if (ForceTimeHighResolution) {
140 timeEndPeriod(1L);
141 }
142 break;
143 default:
144 break;
145 }
146 return true;
147 }
148
149 static inline double fileTimeAsDouble(FILETIME* time) {
150 const double high = (double) ((unsigned int) ~0);
151 const double split = 10000000.0;
152 double result = (time->dwLowDateTime / split) +
153 time->dwHighDateTime * (high/split);
154 return result;
155 }
156
157 // Implementation of os
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 // previous UnhandledExceptionFilter, if there is one
178 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
179
180 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
181
182 void os::init_system_properties_values() {
183 // sysclasspath, java_home, dll_dir
184 {
185 char *home_path;
186 char *dll_path;
187 char *pslash;
188 char *bin = "\\bin";
189 char home_dir[MAX_PATH + 1];
190 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
191
192 if (alt_home_dir != NULL) {
193 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
194 home_dir[MAX_PATH] = '\0';
195 } else {
196 os::jvm_path(home_dir, sizeof(home_dir));
197 // Found the full path to jvm.dll.
198 // Now cut the path to <java_home>/jre if we can.
199 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL) {
202 *pslash = '\0'; // get rid of \{client|server}
203 pslash = strrchr(home_dir, '\\');
204 if (pslash != NULL) {
205 *pslash = '\0'; // get rid of \bin
206 }
207 }
208 }
209
210 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
211 if (home_path == NULL) {
212 return;
213 }
214 strcpy(home_path, home_dir);
215 Arguments::set_java_home(home_path);
216 FREE_C_HEAP_ARRAY(char, home_path);
217
218 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
219 mtInternal);
220 if (dll_path == NULL) {
221 return;
222 }
223 strcpy(dll_path, home_dir);
224 strcat(dll_path, bin);
225 Arguments::set_dll_dir(dll_path);
226 FREE_C_HEAP_ARRAY(char, dll_path);
227
228 if (!set_boot_path('\\', ';')) {
229 return;
230 }
231 }
232
233 // library_path
234 #define EXT_DIR "\\lib\\ext"
235 #define BIN_DIR "\\bin"
236 #define PACKAGE_DIR "\\Sun\\Java"
237 {
238 // Win32 library search order (See the documentation for LoadLibrary):
239 //
240 // 1. The directory from which application is loaded.
241 // 2. The system wide Java Extensions directory (Java only)
242 // 3. System directory (GetSystemDirectory)
243 // 4. Windows directory (GetWindowsDirectory)
244 // 5. The PATH environment variable
245 // 6. The current directory
246
247 char *library_path;
248 char tmp[MAX_PATH];
249 char *path_str = ::getenv("PATH");
250
251 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
252 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
253
254 library_path[0] = '\0';
255
256 GetModuleFileName(NULL, tmp, sizeof(tmp));
257 *(strrchr(tmp, '\\')) = '\0';
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263 strcat(library_path, PACKAGE_DIR BIN_DIR);
264
265 GetSystemDirectory(tmp, sizeof(tmp));
266 strcat(library_path, ";");
267 strcat(library_path, tmp);
268
269 GetWindowsDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 if (path_str) {
274 strcat(library_path, ";");
275 strcat(library_path, path_str);
276 }
277
278 strcat(library_path, ";.");
279
280 Arguments::set_library_path(library_path);
281 FREE_C_HEAP_ARRAY(char, library_path);
282 }
283
284 // Default extensions directory
285 {
286 char path[MAX_PATH];
287 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
288 GetWindowsDirectory(path, MAX_PATH);
289 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
290 path, PACKAGE_DIR, EXT_DIR);
291 Arguments::set_ext_dirs(buf);
292 }
293 #undef EXT_DIR
294 #undef BIN_DIR
295 #undef PACKAGE_DIR
296
297 #ifndef _WIN64
298 // set our UnhandledExceptionFilter and save any previous one
299 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
300 #endif
301
302 // Done
303 return;
304 }
305
306 void os::breakpoint() {
307 DebugBreak();
308 }
309
310 // Invoked from the BREAKPOINT Macro
311 extern "C" void breakpoint() {
312 os::breakpoint();
313 }
314
315 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
316 // So far, this method is only used by Native Memory Tracking, which is
317 // only supported on Windows XP or later.
318 //
319 int os::get_native_stack(address* stack, int frames, int toSkip) {
320 #ifdef _NMT_NOINLINE_
321 toSkip++;
322 #endif
323 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
324 (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357
358 #ifdef _M_IA64
359 // IA64 has memory and register stacks
360 //
361 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
362 // at thread creation (1MB backing store growing upwards, 1MB memory stack
363 // growing downwards, 2MB summed up)
364 //
365 // ...
366 // ------- top of stack (high address) -----
367 // |
368 // | 1MB
369 // | Backing Store (Register Stack)
370 // |
371 // | / \
372 // | |
373 // | |
374 // | |
375 // ------------------------ stack base -----
376 // | 1MB
377 // | Memory Stack
378 // |
379 // | |
380 // | |
381 // | |
382 // | \ /
383 // |
384 // ----- bottom of stack (low address) -----
385 // ...
386
387 stack_size = stack_size / 2;
388 #endif
389 return stack_bottom + stack_size;
390 }
391
392 size_t os::current_stack_size() {
393 size_t sz;
394 MEMORY_BASIC_INFORMATION minfo;
395 VirtualQuery(&minfo, &minfo, sizeof(minfo));
396 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
397 return sz;
398 }
399
400 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
401 const struct tm* time_struct_ptr = localtime(clock);
402 if (time_struct_ptr != NULL) {
403 *res = *time_struct_ptr;
404 return res;
405 }
406 return NULL;
407 }
408
409 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
410
411 // Thread start routine for all new Java threads
412 static unsigned __stdcall java_start(Thread* thread) {
413 // Try to randomize the cache line index of hot stack frames.
414 // This helps when threads of the same stack traces evict each other's
415 // cache lines. The threads can be either from the same JVM instance, or
416 // from different JVM instances. The benefit is especially true for
417 // processors with hyperthreading technology.
418 static int counter = 0;
419 int pid = os::current_process_id();
420 _alloca(((pid ^ counter++) & 7) * 128);
421
422 OSThread* osthr = thread->osthread();
423 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
424
425 if (UseNUMA) {
426 int lgrp_id = os::numa_get_group_id();
427 if (lgrp_id != -1) {
428 thread->set_lgrp_id(lgrp_id);
429 }
430 }
431
432 // Diagnostic code to investigate JDK-6573254
433 int res = 30115; // non-java thread
434 if (thread->is_Java_thread()) {
435 res = 20115; // java thread
436 }
437
438 // Install a win32 structured exception handler around every thread created
439 // by VM, so VM can generate error dump when an exception occurred in non-
440 // Java thread (e.g. VM thread).
441 __try {
442 thread->run();
443 } __except(topLevelExceptionFilter(
444 (_EXCEPTION_POINTERS*)_exception_info())) {
445 // Nothing to do.
446 }
447
448 // One less thread is executing
449 // When the VMThread gets here, the main thread may have already exited
450 // which frees the CodeHeap containing the Atomic::add code
451 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
452 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
453 }
454
455 // Thread must not return from exit_process_or_thread(), but if it does,
456 // let it proceed to exit normally
457 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
458 }
459
460 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
461 int thread_id) {
462 // Allocate the OSThread object
463 OSThread* osthread = new OSThread(NULL, NULL);
464 if (osthread == NULL) return NULL;
465
466 // Initialize support for Java interrupts
467 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
468 if (interrupt_event == NULL) {
469 delete osthread;
470 return NULL;
471 }
472 osthread->set_interrupt_event(interrupt_event);
473
474 // Store info on the Win32 thread into the OSThread
475 osthread->set_thread_handle(thread_handle);
476 osthread->set_thread_id(thread_id);
477
478 if (UseNUMA) {
479 int lgrp_id = os::numa_get_group_id();
480 if (lgrp_id != -1) {
481 thread->set_lgrp_id(lgrp_id);
482 }
483 }
484
485 // Initial thread state is INITIALIZED, not SUSPENDED
486 osthread->set_state(INITIALIZED);
487
488 return osthread;
489 }
490
491
492 bool os::create_attached_thread(JavaThread* thread) {
493 #ifdef ASSERT
494 thread->verify_not_published();
495 #endif
496 HANDLE thread_h;
497 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
498 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
499 fatal("DuplicateHandle failed\n");
500 }
501 OSThread* osthread = create_os_thread(thread, thread_h,
502 (int)current_thread_id());
503 if (osthread == NULL) {
504 return false;
505 }
506
507 // Initial thread state is RUNNABLE
508 osthread->set_state(RUNNABLE);
509
510 thread->set_osthread(osthread);
511 return true;
512 }
513
514 bool os::create_main_thread(JavaThread* thread) {
515 #ifdef ASSERT
516 thread->verify_not_published();
517 #endif
518 if (_starting_thread == NULL) {
519 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
520 if (_starting_thread == NULL) {
521 return false;
522 }
523 }
524
525 // The primordial thread is runnable from the start)
526 _starting_thread->set_state(RUNNABLE);
527
528 thread->set_osthread(_starting_thread);
529 return true;
530 }
531
532 // Allocate and initialize a new OSThread
533 bool os::create_thread(Thread* thread, ThreadType thr_type,
534 size_t stack_size) {
535 unsigned thread_id;
536
537 // Allocate the OSThread object
538 OSThread* osthread = new OSThread(NULL, NULL);
539 if (osthread == NULL) {
540 return false;
541 }
542
543 // Initialize support for Java interrupts
544 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
545 if (interrupt_event == NULL) {
546 delete osthread;
547 return NULL;
548 }
549 osthread->set_interrupt_event(interrupt_event);
550 osthread->set_interrupted(false);
551
552 thread->set_osthread(osthread);
553
554 if (stack_size == 0) {
555 switch (thr_type) {
556 case os::java_thread:
557 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
558 if (JavaThread::stack_size_at_create() > 0) {
559 stack_size = JavaThread::stack_size_at_create();
560 }
561 break;
562 case os::compiler_thread:
563 if (CompilerThreadStackSize > 0) {
564 stack_size = (size_t)(CompilerThreadStackSize * K);
565 break;
566 } // else fall through:
567 // use VMThreadStackSize if CompilerThreadStackSize is not defined
568 case os::vm_thread:
569 case os::pgc_thread:
570 case os::cgc_thread:
571 case os::watcher_thread:
572 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
573 break;
574 }
575 }
576
577 // Create the Win32 thread
578 //
579 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
580 // does not specify stack size. Instead, it specifies the size of
581 // initially committed space. The stack size is determined by
582 // PE header in the executable. If the committed "stack_size" is larger
583 // than default value in the PE header, the stack is rounded up to the
584 // nearest multiple of 1MB. For example if the launcher has default
585 // stack size of 320k, specifying any size less than 320k does not
586 // affect the actual stack size at all, it only affects the initial
587 // commitment. On the other hand, specifying 'stack_size' larger than
588 // default value may cause significant increase in memory usage, because
589 // not only the stack space will be rounded up to MB, but also the
590 // entire space is committed upfront.
591 //
592 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
593 // for CreateThread() that can treat 'stack_size' as stack size. However we
594 // are not supposed to call CreateThread() directly according to MSDN
595 // document because JVM uses C runtime library. The good news is that the
596 // flag appears to work with _beginthredex() as well.
597
598 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
599 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
600 #endif
601
602 HANDLE thread_handle =
603 (HANDLE)_beginthreadex(NULL,
604 (unsigned)stack_size,
605 (unsigned (__stdcall *)(void*)) java_start,
606 thread,
607 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
608 &thread_id);
609 if (thread_handle == NULL) {
610 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
611 // without the flag.
612 thread_handle =
613 (HANDLE)_beginthreadex(NULL,
614 (unsigned)stack_size,
615 (unsigned (__stdcall *)(void*)) java_start,
616 thread,
617 CREATE_SUSPENDED,
618 &thread_id);
619 }
620 if (thread_handle == NULL) {
621 // Need to clean up stuff we've allocated so far
622 CloseHandle(osthread->interrupt_event());
623 thread->set_osthread(NULL);
624 delete osthread;
625 return NULL;
626 }
627
628 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
629
630 // Store info on the Win32 thread into the OSThread
631 osthread->set_thread_handle(thread_handle);
632 osthread->set_thread_id(thread_id);
633
634 // Initial thread state is INITIALIZED, not SUSPENDED
635 osthread->set_state(INITIALIZED);
636
637 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
638 return true;
639 }
640
641
642 // Free Win32 resources related to the OSThread
643 void os::free_thread(OSThread* osthread) {
644 assert(osthread != NULL, "osthread not set");
645 CloseHandle(osthread->thread_handle());
646 CloseHandle(osthread->interrupt_event());
647 delete osthread;
648 }
649
650 static jlong first_filetime;
651 static jlong initial_performance_count;
652 static jlong performance_frequency;
653
654
655 jlong as_long(LARGE_INTEGER x) {
656 jlong result = 0; // initialization to avoid warning
657 set_high(&result, x.HighPart);
658 set_low(&result, x.LowPart);
659 return result;
660 }
661
662
663 jlong os::elapsed_counter() {
664 LARGE_INTEGER count;
665 if (win32::_has_performance_count) {
666 QueryPerformanceCounter(&count);
667 return as_long(count) - initial_performance_count;
668 } else {
669 FILETIME wt;
670 GetSystemTimeAsFileTime(&wt);
671 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
672 }
673 }
674
675
676 jlong os::elapsed_frequency() {
677 if (win32::_has_performance_count) {
678 return performance_frequency;
679 } else {
680 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
681 return 10000000;
682 }
683 }
684
685
686 julong os::available_memory() {
687 return win32::available_memory();
688 }
689
690 julong os::win32::available_memory() {
691 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
692 // value if total memory is larger than 4GB
693 MEMORYSTATUSEX ms;
694 ms.dwLength = sizeof(ms);
695 GlobalMemoryStatusEx(&ms);
696
697 return (julong)ms.ullAvailPhys;
698 }
699
700 julong os::physical_memory() {
701 return win32::physical_memory();
702 }
703
704 bool os::has_allocatable_memory_limit(julong* limit) {
705 MEMORYSTATUSEX ms;
706 ms.dwLength = sizeof(ms);
707 GlobalMemoryStatusEx(&ms);
708 #ifdef _LP64
709 *limit = (julong)ms.ullAvailVirtual;
710 return true;
711 #else
712 // Limit to 1400m because of the 2gb address space wall
713 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
714 return true;
715 #endif
716 }
717
718 // VC6 lacks DWORD_PTR
719 #if _MSC_VER < 1300
720 typedef UINT_PTR DWORD_PTR;
721 #endif
722
723 int os::active_processor_count() {
724 DWORD_PTR lpProcessAffinityMask = 0;
725 DWORD_PTR lpSystemAffinityMask = 0;
726 int proc_count = processor_count();
727 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
728 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
729 // Nof active processors is number of bits in process affinity mask
730 int bitcount = 0;
731 while (lpProcessAffinityMask != 0) {
732 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
733 bitcount++;
734 }
735 return bitcount;
736 } else {
737 return proc_count;
738 }
739 }
740
741 void os::set_native_thread_name(const char *name) {
742
743 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
744 //
745 // Note that unfortunately this only works if the process
746 // is already attached to a debugger; debugger must observe
747 // the exception below to show the correct name.
748
749 const DWORD MS_VC_EXCEPTION = 0x406D1388;
750 struct {
751 DWORD dwType; // must be 0x1000
752 LPCSTR szName; // pointer to name (in user addr space)
753 DWORD dwThreadID; // thread ID (-1=caller thread)
754 DWORD dwFlags; // reserved for future use, must be zero
755 } info;
756
757 info.dwType = 0x1000;
758 info.szName = name;
759 info.dwThreadID = -1;
760 info.dwFlags = 0;
761
762 __try {
763 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
764 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
765 }
766
767 bool os::distribute_processes(uint length, uint* distribution) {
768 // Not yet implemented.
769 return false;
770 }
771
772 bool os::bind_to_processor(uint processor_id) {
773 // Not yet implemented.
774 return false;
775 }
776
777 void os::win32::initialize_performance_counter() {
778 LARGE_INTEGER count;
779 if (QueryPerformanceFrequency(&count)) {
780 win32::_has_performance_count = 1;
781 performance_frequency = as_long(count);
782 QueryPerformanceCounter(&count);
783 initial_performance_count = as_long(count);
784 } else {
785 win32::_has_performance_count = 0;
786 FILETIME wt;
787 GetSystemTimeAsFileTime(&wt);
788 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
789 }
790 }
791
792
793 double os::elapsedTime() {
794 return (double) elapsed_counter() / (double) elapsed_frequency();
795 }
796
797
798 // Windows format:
799 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
800 // Java format:
801 // Java standards require the number of milliseconds since 1/1/1970
802
803 // Constant offset - calculated using offset()
804 static jlong _offset = 116444736000000000;
805 // Fake time counter for reproducible results when debugging
806 static jlong fake_time = 0;
807
808 #ifdef ASSERT
809 // Just to be safe, recalculate the offset in debug mode
810 static jlong _calculated_offset = 0;
811 static int _has_calculated_offset = 0;
812
813 jlong offset() {
814 if (_has_calculated_offset) return _calculated_offset;
815 SYSTEMTIME java_origin;
816 java_origin.wYear = 1970;
817 java_origin.wMonth = 1;
818 java_origin.wDayOfWeek = 0; // ignored
819 java_origin.wDay = 1;
820 java_origin.wHour = 0;
821 java_origin.wMinute = 0;
822 java_origin.wSecond = 0;
823 java_origin.wMilliseconds = 0;
824 FILETIME jot;
825 if (!SystemTimeToFileTime(&java_origin, &jot)) {
826 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
827 }
828 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
829 _has_calculated_offset = 1;
830 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
831 return _calculated_offset;
832 }
833 #else
834 jlong offset() {
835 return _offset;
836 }
837 #endif
838
839 jlong windows_to_java_time(FILETIME wt) {
840 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
841 return (a - offset()) / 10000;
842 }
843
844 // Returns time ticks in (10th of micro seconds)
845 jlong windows_to_time_ticks(FILETIME wt) {
846 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
847 return (a - offset());
848 }
849
850 FILETIME java_to_windows_time(jlong l) {
851 jlong a = (l * 10000) + offset();
852 FILETIME result;
853 result.dwHighDateTime = high(a);
854 result.dwLowDateTime = low(a);
855 return result;
856 }
857
858 bool os::supports_vtime() { return true; }
859 bool os::enable_vtime() { return false; }
860 bool os::vtime_enabled() { return false; }
861
862 double os::elapsedVTime() {
863 FILETIME created;
864 FILETIME exited;
865 FILETIME kernel;
866 FILETIME user;
867 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
868 // the resolution of windows_to_java_time() should be sufficient (ms)
869 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
870 } else {
871 return elapsedTime();
872 }
873 }
874
875 jlong os::javaTimeMillis() {
876 if (UseFakeTimers) {
877 return fake_time++;
878 } else {
879 FILETIME wt;
880 GetSystemTimeAsFileTime(&wt);
881 return windows_to_java_time(wt);
882 }
883 }
884
885 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
886 FILETIME wt;
887 GetSystemTimeAsFileTime(&wt);
888 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
889 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
890 seconds = secs;
891 nanos = jlong(ticks - (secs*10000000)) * 100;
892 }
893
894 jlong os::javaTimeNanos() {
895 if (!win32::_has_performance_count) {
896 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
897 } else {
898 LARGE_INTEGER current_count;
899 QueryPerformanceCounter(¤t_count);
900 double current = as_long(current_count);
901 double freq = performance_frequency;
902 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
903 return time;
904 }
905 }
906
907 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
908 if (!win32::_has_performance_count) {
909 // javaTimeMillis() doesn't have much percision,
910 // but it is not going to wrap -- so all 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912
913 // this is a wall clock timer, so may skip
914 info_ptr->may_skip_backward = true;
915 info_ptr->may_skip_forward = true;
916 } else {
917 jlong freq = performance_frequency;
918 if (freq < NANOSECS_PER_SEC) {
919 // the performance counter is 64 bits and we will
920 // be multiplying it -- so no wrap in 64 bits
921 info_ptr->max_value = ALL_64_BITS;
922 } else if (freq > NANOSECS_PER_SEC) {
923 // use the max value the counter can reach to
924 // determine the max value which could be returned
925 julong max_counter = (julong)ALL_64_BITS;
926 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
927 } else {
928 // the performance counter is 64 bits and we will
929 // be using it directly -- so no wrap in 64 bits
930 info_ptr->max_value = ALL_64_BITS;
931 }
932
933 // using a counter, so no skipping
934 info_ptr->may_skip_backward = false;
935 info_ptr->may_skip_forward = false;
936 }
937 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
938 }
939
940 char* os::local_time_string(char *buf, size_t buflen) {
941 SYSTEMTIME st;
942 GetLocalTime(&st);
943 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
944 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
945 return buf;
946 }
947
948 bool os::getTimesSecs(double* process_real_time,
949 double* process_user_time,
950 double* process_system_time) {
951 HANDLE h_process = GetCurrentProcess();
952 FILETIME create_time, exit_time, kernel_time, user_time;
953 BOOL result = GetProcessTimes(h_process,
954 &create_time,
955 &exit_time,
956 &kernel_time,
957 &user_time);
958 if (result != 0) {
959 FILETIME wt;
960 GetSystemTimeAsFileTime(&wt);
961 jlong rtc_millis = windows_to_java_time(wt);
962 jlong user_millis = windows_to_java_time(user_time);
963 jlong system_millis = windows_to_java_time(kernel_time);
964 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
965 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
966 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
967 return true;
968 } else {
969 return false;
970 }
971 }
972
973 void os::shutdown() {
974 // allow PerfMemory to attempt cleanup of any persistent resources
975 perfMemory_exit();
976
977 // flush buffered output, finish log files
978 ostream_abort();
979
980 // Check for abort hook
981 abort_hook_t abort_hook = Arguments::abort_hook();
982 if (abort_hook != NULL) {
983 abort_hook();
984 }
985 }
986
987
988 static BOOL (WINAPI *_MiniDumpWriteDump)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
989 PMINIDUMP_EXCEPTION_INFORMATION,
990 PMINIDUMP_USER_STREAM_INFORMATION,
991 PMINIDUMP_CALLBACK_INFORMATION);
992
993 static HANDLE dumpFile = NULL;
994
995 // Check if dump file can be created.
996 void os::check_dump_limit(char* buffer, size_t buffsz) {
997 bool status = true;
998 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
999 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1000 status = false;
1001 }
1002
1003 #ifndef ASSERT
1004 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1005 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1006 status = false;
1007 }
1008 #endif
1009
1010 if (status) {
1011 const char* cwd = get_current_directory(NULL, 0);
1012 int pid = current_process_id();
1013 if (cwd != NULL) {
1014 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1015 } else {
1016 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1017 }
1018
1019 if (dumpFile == NULL &&
1020 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1021 == INVALID_HANDLE_VALUE) {
1022 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1023 status = false;
1024 }
1025 }
1026 VMError::record_coredump_status(buffer, status);
1027 }
1028
1029 void os::abort(bool dump_core, void* siginfo, void* context) {
1030 HINSTANCE dbghelp;
1031 EXCEPTION_POINTERS ep;
1032 MINIDUMP_EXCEPTION_INFORMATION mei;
1033 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1034
1035 HANDLE hProcess = GetCurrentProcess();
1036 DWORD processId = GetCurrentProcessId();
1037 MINIDUMP_TYPE dumpType;
1038
1039 shutdown();
1040 if (!dump_core || dumpFile == NULL) {
1041 if (dumpFile != NULL) {
1042 CloseHandle(dumpFile);
1043 }
1044 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1045 }
1046
1047 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1048
1049 if (dbghelp == NULL) {
1050 jio_fprintf(stderr, "Failed to load dbghelp.dll\n");
1051 CloseHandle(dumpFile);
1052 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1053 }
1054
1055 _MiniDumpWriteDump =
1056 CAST_TO_FN_PTR(BOOL(WINAPI *)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE,
1057 PMINIDUMP_EXCEPTION_INFORMATION,
1058 PMINIDUMP_USER_STREAM_INFORMATION,
1059 PMINIDUMP_CALLBACK_INFORMATION),
1060 GetProcAddress(dbghelp,
1061 "MiniDumpWriteDump"));
1062
1063 if (_MiniDumpWriteDump == NULL) {
1064 jio_fprintf(stderr, "Failed to find MiniDumpWriteDump() in module dbghelp.dll.\n");
1065 CloseHandle(dumpFile);
1066 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1067 }
1068
1069 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1070
1071 // Older versions of dbghelp.h do not contain all the dumptypes we want, dbghelp.h with
1072 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1073 #if API_VERSION_NUMBER >= 11
1074 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1075 MiniDumpWithUnloadedModules);
1076 #endif
1077
1078 if (siginfo != NULL && context != NULL) {
1079 ep.ContextRecord = (PCONTEXT) context;
1080 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1081
1082 mei.ThreadId = GetCurrentThreadId();
1083 mei.ExceptionPointers = &ep;
1084 pmei = &mei;
1085 } else {
1086 pmei = NULL;
1087 }
1088
1089 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1090 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1091 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1092 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1093 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1094 }
1095 CloseHandle(dumpFile);
1096 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1097 }
1098
1099 // Die immediately, no exit hook, no abort hook, no cleanup.
1100 void os::die() {
1101 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1102 }
1103
1104 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1105 // * dirent_md.c 1.15 00/02/02
1106 //
1107 // The declarations for DIR and struct dirent are in jvm_win32.h.
1108
1109 // Caller must have already run dirname through JVM_NativePath, which removes
1110 // duplicate slashes and converts all instances of '/' into '\\'.
1111
1112 DIR * os::opendir(const char *dirname) {
1113 assert(dirname != NULL, "just checking"); // hotspot change
1114 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1115 DWORD fattr; // hotspot change
1116 char alt_dirname[4] = { 0, 0, 0, 0 };
1117
1118 if (dirp == 0) {
1119 errno = ENOMEM;
1120 return 0;
1121 }
1122
1123 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1124 // as a directory in FindFirstFile(). We detect this case here and
1125 // prepend the current drive name.
1126 //
1127 if (dirname[1] == '\0' && dirname[0] == '\\') {
1128 alt_dirname[0] = _getdrive() + 'A' - 1;
1129 alt_dirname[1] = ':';
1130 alt_dirname[2] = '\\';
1131 alt_dirname[3] = '\0';
1132 dirname = alt_dirname;
1133 }
1134
1135 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1136 if (dirp->path == 0) {
1137 free(dirp);
1138 errno = ENOMEM;
1139 return 0;
1140 }
1141 strcpy(dirp->path, dirname);
1142
1143 fattr = GetFileAttributes(dirp->path);
1144 if (fattr == 0xffffffff) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOENT;
1148 return 0;
1149 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1150 free(dirp->path);
1151 free(dirp);
1152 errno = ENOTDIR;
1153 return 0;
1154 }
1155
1156 // Append "*.*", or possibly "\\*.*", to path
1157 if (dirp->path[1] == ':' &&
1158 (dirp->path[2] == '\0' ||
1159 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1160 // No '\\' needed for cases like "Z:" or "Z:\"
1161 strcat(dirp->path, "*.*");
1162 } else {
1163 strcat(dirp->path, "\\*.*");
1164 }
1165
1166 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1167 if (dirp->handle == INVALID_HANDLE_VALUE) {
1168 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1169 free(dirp->path);
1170 free(dirp);
1171 errno = EACCES;
1172 return 0;
1173 }
1174 }
1175 return dirp;
1176 }
1177
1178 // parameter dbuf unused on Windows
1179 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1180 assert(dirp != NULL, "just checking"); // hotspot change
1181 if (dirp->handle == INVALID_HANDLE_VALUE) {
1182 return 0;
1183 }
1184
1185 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1186
1187 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1188 if (GetLastError() == ERROR_INVALID_HANDLE) {
1189 errno = EBADF;
1190 return 0;
1191 }
1192 FindClose(dirp->handle);
1193 dirp->handle = INVALID_HANDLE_VALUE;
1194 }
1195
1196 return &dirp->dirent;
1197 }
1198
1199 int os::closedir(DIR *dirp) {
1200 assert(dirp != NULL, "just checking"); // hotspot change
1201 if (dirp->handle != INVALID_HANDLE_VALUE) {
1202 if (!FindClose(dirp->handle)) {
1203 errno = EBADF;
1204 return -1;
1205 }
1206 dirp->handle = INVALID_HANDLE_VALUE;
1207 }
1208 free(dirp->path);
1209 free(dirp);
1210 return 0;
1211 }
1212
1213 // This must be hard coded because it's the system's temporary
1214 // directory not the java application's temp directory, ala java.io.tmpdir.
1215 const char* os::get_temp_directory() {
1216 static char path_buf[MAX_PATH];
1217 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1218 return path_buf;
1219 } else {
1220 path_buf[0] = '\0';
1221 return path_buf;
1222 }
1223 }
1224
1225 static bool file_exists(const char* filename) {
1226 if (filename == NULL || strlen(filename) == 0) {
1227 return false;
1228 }
1229 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1230 }
1231
1232 bool os::dll_build_name(char *buffer, size_t buflen,
1233 const char* pname, const char* fname) {
1234 bool retval = false;
1235 const size_t pnamelen = pname ? strlen(pname) : 0;
1236 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1237
1238 // Return error on buffer overflow.
1239 if (pnamelen + strlen(fname) + 10 > buflen) {
1240 return retval;
1241 }
1242
1243 if (pnamelen == 0) {
1244 jio_snprintf(buffer, buflen, "%s.dll", fname);
1245 retval = true;
1246 } else if (c == ':' || c == '\\') {
1247 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1248 retval = true;
1249 } else if (strchr(pname, *os::path_separator()) != NULL) {
1250 int n;
1251 char** pelements = split_path(pname, &n);
1252 if (pelements == NULL) {
1253 return false;
1254 }
1255 for (int i = 0; i < n; i++) {
1256 char* path = pelements[i];
1257 // Really shouldn't be NULL, but check can't hurt
1258 size_t plen = (path == NULL) ? 0 : strlen(path);
1259 if (plen == 0) {
1260 continue; // skip the empty path values
1261 }
1262 const char lastchar = path[plen - 1];
1263 if (lastchar == ':' || lastchar == '\\') {
1264 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1265 } else {
1266 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1267 }
1268 if (file_exists(buffer)) {
1269 retval = true;
1270 break;
1271 }
1272 }
1273 // release the storage
1274 for (int i = 0; i < n; i++) {
1275 if (pelements[i] != NULL) {
1276 FREE_C_HEAP_ARRAY(char, pelements[i]);
1277 }
1278 }
1279 if (pelements != NULL) {
1280 FREE_C_HEAP_ARRAY(char*, pelements);
1281 }
1282 } else {
1283 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1284 retval = true;
1285 }
1286 return retval;
1287 }
1288
1289 // Needs to be in os specific directory because windows requires another
1290 // header file <direct.h>
1291 const char* os::get_current_directory(char *buf, size_t buflen) {
1292 int n = static_cast<int>(buflen);
1293 if (buflen > INT_MAX) n = INT_MAX;
1294 return _getcwd(buf, n);
1295 }
1296
1297 //-----------------------------------------------------------
1298 // Helper functions for fatal error handler
1299 #ifdef _WIN64
1300 // Helper routine which returns true if address in
1301 // within the NTDLL address space.
1302 //
1303 static bool _addr_in_ntdll(address addr) {
1304 HMODULE hmod;
1305 MODULEINFO minfo;
1306
1307 hmod = GetModuleHandle("NTDLL.DLL");
1308 if (hmod == NULL) return false;
1309 if (!os::PSApiDll::GetModuleInformation(GetCurrentProcess(), hmod,
1310 &minfo, sizeof(MODULEINFO))) {
1311 return false;
1312 }
1313
1314 if ((addr >= minfo.lpBaseOfDll) &&
1315 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1316 return true;
1317 } else {
1318 return false;
1319 }
1320 }
1321 #endif
1322
1323 struct _modinfo {
1324 address addr;
1325 char* full_path; // point to a char buffer
1326 int buflen; // size of the buffer
1327 address base_addr;
1328 };
1329
1330 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1331 address top_address, void * param) {
1332 struct _modinfo *pmod = (struct _modinfo *)param;
1333 if (!pmod) return -1;
1334
1335 if (base_addr <= pmod->addr &&
1336 top_address > pmod->addr) {
1337 // if a buffer is provided, copy path name to the buffer
1338 if (pmod->full_path) {
1339 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1340 }
1341 pmod->base_addr = base_addr;
1342 return 1;
1343 }
1344 return 0;
1345 }
1346
1347 bool os::dll_address_to_library_name(address addr, char* buf,
1348 int buflen, int* offset) {
1349 // buf is not optional, but offset is optional
1350 assert(buf != NULL, "sanity check");
1351
1352 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1353 // return the full path to the DLL file, sometimes it returns path
1354 // to the corresponding PDB file (debug info); sometimes it only
1355 // returns partial path, which makes life painful.
1356
1357 struct _modinfo mi;
1358 mi.addr = addr;
1359 mi.full_path = buf;
1360 mi.buflen = buflen;
1361 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1362 // buf already contains path name
1363 if (offset) *offset = addr - mi.base_addr;
1364 return true;
1365 }
1366
1367 buf[0] = '\0';
1368 if (offset) *offset = -1;
1369 return false;
1370 }
1371
1372 bool os::dll_address_to_function_name(address addr, char *buf,
1373 int buflen, int *offset,
1374 bool demangle) {
1375 // buf is not optional, but offset is optional
1376 assert(buf != NULL, "sanity check");
1377
1378 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1379 return true;
1380 }
1381 if (offset != NULL) *offset = -1;
1382 buf[0] = '\0';
1383 return false;
1384 }
1385
1386 // save the start and end address of jvm.dll into param[0] and param[1]
1387 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1388 address top_address, void * param) {
1389 if (!param) return -1;
1390
1391 if (base_addr <= (address)_locate_jvm_dll &&
1392 top_address > (address)_locate_jvm_dll) {
1393 ((address*)param)[0] = base_addr;
1394 ((address*)param)[1] = top_address;
1395 return 1;
1396 }
1397 return 0;
1398 }
1399
1400 address vm_lib_location[2]; // start and end address of jvm.dll
1401
1402 // check if addr is inside jvm.dll
1403 bool os::address_is_in_vm(address addr) {
1404 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1405 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1406 assert(false, "Can't find jvm module.");
1407 return false;
1408 }
1409 }
1410
1411 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1412 }
1413
1414 // print module info; param is outputStream*
1415 static int _print_module(const char* fname, address base_address,
1416 address top_address, void* param) {
1417 if (!param) return -1;
1418
1419 outputStream* st = (outputStream*)param;
1420
1421 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1422 return 0;
1423 }
1424
1425 // Loads .dll/.so and
1426 // in case of error it checks if .dll/.so was built for the
1427 // same architecture as Hotspot is running on
1428 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1429 void * result = LoadLibrary(name);
1430 if (result != NULL) {
1431 return result;
1432 }
1433
1434 DWORD errcode = GetLastError();
1435 if (errcode == ERROR_MOD_NOT_FOUND) {
1436 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1437 ebuf[ebuflen - 1] = '\0';
1438 return NULL;
1439 }
1440
1441 // Parsing dll below
1442 // If we can read dll-info and find that dll was built
1443 // for an architecture other than Hotspot is running in
1444 // - then print to buffer "DLL was built for a different architecture"
1445 // else call os::lasterror to obtain system error message
1446
1447 // Read system error message into ebuf
1448 // It may or may not be overwritten below (in the for loop and just above)
1449 lasterror(ebuf, (size_t) ebuflen);
1450 ebuf[ebuflen - 1] = '\0';
1451 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1452 if (fd < 0) {
1453 return NULL;
1454 }
1455
1456 uint32_t signature_offset;
1457 uint16_t lib_arch = 0;
1458 bool failed_to_get_lib_arch =
1459 ( // Go to position 3c in the dll
1460 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1461 ||
1462 // Read location of signature
1463 (sizeof(signature_offset) !=
1464 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1465 ||
1466 // Go to COFF File Header in dll
1467 // that is located after "signature" (4 bytes long)
1468 (os::seek_to_file_offset(fd,
1469 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1470 ||
1471 // Read field that contains code of architecture
1472 // that dll was built for
1473 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1474 );
1475
1476 ::close(fd);
1477 if (failed_to_get_lib_arch) {
1478 // file i/o error - report os::lasterror(...) msg
1479 return NULL;
1480 }
1481
1482 typedef struct {
1483 uint16_t arch_code;
1484 char* arch_name;
1485 } arch_t;
1486
1487 static const arch_t arch_array[] = {
1488 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1489 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1490 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1491 };
1492 #if (defined _M_IA64)
1493 static const uint16_t running_arch = IMAGE_FILE_MACHINE_IA64;
1494 #elif (defined _M_AMD64)
1495 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1496 #elif (defined _M_IX86)
1497 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1498 #else
1499 #error Method os::dll_load requires that one of following \
1500 is defined :_M_IA64,_M_AMD64 or _M_IX86
1501 #endif
1502
1503
1504 // Obtain a string for printf operation
1505 // lib_arch_str shall contain string what platform this .dll was built for
1506 // running_arch_str shall string contain what platform Hotspot was built for
1507 char *running_arch_str = NULL, *lib_arch_str = NULL;
1508 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1509 if (lib_arch == arch_array[i].arch_code) {
1510 lib_arch_str = arch_array[i].arch_name;
1511 }
1512 if (running_arch == arch_array[i].arch_code) {
1513 running_arch_str = arch_array[i].arch_name;
1514 }
1515 }
1516
1517 assert(running_arch_str,
1518 "Didn't find running architecture code in arch_array");
1519
1520 // If the architecture is right
1521 // but some other error took place - report os::lasterror(...) msg
1522 if (lib_arch == running_arch) {
1523 return NULL;
1524 }
1525
1526 if (lib_arch_str != NULL) {
1527 ::_snprintf(ebuf, ebuflen - 1,
1528 "Can't load %s-bit .dll on a %s-bit platform",
1529 lib_arch_str, running_arch_str);
1530 } else {
1531 // don't know what architecture this dll was build for
1532 ::_snprintf(ebuf, ebuflen - 1,
1533 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1534 lib_arch, running_arch_str);
1535 }
1536
1537 return NULL;
1538 }
1539
1540 void os::print_dll_info(outputStream *st) {
1541 st->print_cr("Dynamic libraries:");
1542 get_loaded_modules_info(_print_module, (void *)st);
1543 }
1544
1545 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1546 HANDLE hProcess;
1547
1548 # define MAX_NUM_MODULES 128
1549 HMODULE modules[MAX_NUM_MODULES];
1550 static char filename[MAX_PATH];
1551 int result = 0;
1552
1553 if (!os::PSApiDll::PSApiAvailable()) {
1554 return 0;
1555 }
1556
1557 int pid = os::current_process_id();
1558 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1559 FALSE, pid);
1560 if (hProcess == NULL) return 0;
1561
1562 DWORD size_needed;
1563 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1564 sizeof(modules), &size_needed)) {
1565 CloseHandle(hProcess);
1566 return 0;
1567 }
1568
1569 // number of modules that are currently loaded
1570 int num_modules = size_needed / sizeof(HMODULE);
1571
1572 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1573 // Get Full pathname:
1574 if (!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1575 filename, sizeof(filename))) {
1576 filename[0] = '\0';
1577 }
1578
1579 MODULEINFO modinfo;
1580 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1581 &modinfo, sizeof(modinfo))) {
1582 modinfo.lpBaseOfDll = NULL;
1583 modinfo.SizeOfImage = 0;
1584 }
1585
1586 // Invoke callback function
1587 result = callback(filename, (address)modinfo.lpBaseOfDll,
1588 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1589 if (result) break;
1590 }
1591
1592 CloseHandle(hProcess);
1593 return result;
1594 }
1595
1596 void os::print_os_info_brief(outputStream* st) {
1597 os::print_os_info(st);
1598 }
1599
1600 void os::print_os_info(outputStream* st) {
1601 #ifdef ASSERT
1602 char buffer[1024];
1603 DWORD size = sizeof(buffer);
1604 st->print(" HostName: ");
1605 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1606 st->print("%s", buffer);
1607 } else {
1608 st->print("N/A");
1609 }
1610 #endif
1611 st->print(" OS:");
1612 os::win32::print_windows_version(st);
1613 }
1614
1615 void os::win32::print_windows_version(outputStream* st) {
1616 OSVERSIONINFOEX osvi;
1617 VS_FIXEDFILEINFO *file_info;
1618 TCHAR kernel32_path[MAX_PATH];
1619 UINT len, ret;
1620
1621 // Use the GetVersionEx information to see if we're on a server or
1622 // workstation edition of Windows. Starting with Windows 8.1 we can't
1623 // trust the OS version information returned by this API.
1624 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1625 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1626 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1627 st->print_cr("Call to GetVersionEx failed");
1628 return;
1629 }
1630 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1631
1632 // Get the full path to \Windows\System32\kernel32.dll and use that for
1633 // determining what version of Windows we're running on.
1634 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1635 ret = GetSystemDirectory(kernel32_path, len);
1636 if (ret == 0 || ret > len) {
1637 st->print_cr("Call to GetSystemDirectory failed");
1638 return;
1639 }
1640 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1641
1642 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1643 if (version_size == 0) {
1644 st->print_cr("Call to GetFileVersionInfoSize failed");
1645 return;
1646 }
1647
1648 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1649 if (version_info == NULL) {
1650 st->print_cr("Failed to allocate version_info");
1651 return;
1652 }
1653
1654 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1655 os::free(version_info);
1656 st->print_cr("Call to GetFileVersionInfo failed");
1657 return;
1658 }
1659
1660 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1661 os::free(version_info);
1662 st->print_cr("Call to VerQueryValue failed");
1663 return;
1664 }
1665
1666 int major_version = HIWORD(file_info->dwProductVersionMS);
1667 int minor_version = LOWORD(file_info->dwProductVersionMS);
1668 int build_number = HIWORD(file_info->dwProductVersionLS);
1669 int build_minor = LOWORD(file_info->dwProductVersionLS);
1670 int os_vers = major_version * 1000 + minor_version;
1671 os::free(version_info);
1672
1673 st->print(" Windows ");
1674 switch (os_vers) {
1675
1676 case 6000:
1677 if (is_workstation) {
1678 st->print("Vista");
1679 } else {
1680 st->print("Server 2008");
1681 }
1682 break;
1683
1684 case 6001:
1685 if (is_workstation) {
1686 st->print("7");
1687 } else {
1688 st->print("Server 2008 R2");
1689 }
1690 break;
1691
1692 case 6002:
1693 if (is_workstation) {
1694 st->print("8");
1695 } else {
1696 st->print("Server 2012");
1697 }
1698 break;
1699
1700 case 6003:
1701 if (is_workstation) {
1702 st->print("8.1");
1703 } else {
1704 st->print("Server 2012 R2");
1705 }
1706 break;
1707
1708 case 10000:
1709 if (is_workstation) {
1710 st->print("10");
1711 } else {
1712 // The server version name of Windows 10 is not known at this time
1713 st->print("%d.%d", major_version, minor_version);
1714 }
1715 break;
1716
1717 default:
1718 // Unrecognized windows, print out its major and minor versions
1719 st->print("%d.%d", major_version, minor_version);
1720 break;
1721 }
1722
1723 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1724 // find out whether we are running on 64 bit processor or not
1725 SYSTEM_INFO si;
1726 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1727 os::Kernel32Dll::GetNativeSystemInfo(&si);
1728 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1729 st->print(" , 64 bit");
1730 }
1731
1732 st->print(" Build %d", build_number);
1733 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1734 st->cr();
1735 }
1736
1737 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1738 // Nothing to do for now.
1739 }
1740
1741 void os::print_memory_info(outputStream* st) {
1742 st->print("Memory:");
1743 st->print(" %dk page", os::vm_page_size()>>10);
1744
1745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1746 // value if total memory is larger than 4GB
1747 MEMORYSTATUSEX ms;
1748 ms.dwLength = sizeof(ms);
1749 GlobalMemoryStatusEx(&ms);
1750
1751 st->print(", physical %uk", os::physical_memory() >> 10);
1752 st->print("(%uk free)", os::available_memory() >> 10);
1753
1754 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1755 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1756 st->cr();
1757 }
1758
1759 void os::print_siginfo(outputStream *st, void *siginfo) {
1760 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1761 st->print("siginfo:");
1762 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1763
1764 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1765 er->NumberParameters >= 2) {
1766 switch (er->ExceptionInformation[0]) {
1767 case 0: st->print(", reading address"); break;
1768 case 1: st->print(", writing address"); break;
1769 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1770 er->ExceptionInformation[0]);
1771 }
1772 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1773 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1774 er->NumberParameters >= 2 && UseSharedSpaces) {
1775 FileMapInfo* mapinfo = FileMapInfo::current_info();
1776 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1777 st->print("\n\nError accessing class data sharing archive." \
1778 " Mapped file inaccessible during execution, " \
1779 " possible disk/network problem.");
1780 }
1781 } else {
1782 int num = er->NumberParameters;
1783 if (num > 0) {
1784 st->print(", ExceptionInformation=");
1785 for (int i = 0; i < num; i++) {
1786 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1787 }
1788 }
1789 }
1790 st->cr();
1791 }
1792
1793 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1794 // do nothing
1795 }
1796
1797 static char saved_jvm_path[MAX_PATH] = {0};
1798
1799 // Find the full path to the current module, jvm.dll
1800 void os::jvm_path(char *buf, jint buflen) {
1801 // Error checking.
1802 if (buflen < MAX_PATH) {
1803 assert(false, "must use a large-enough buffer");
1804 buf[0] = '\0';
1805 return;
1806 }
1807 // Lazy resolve the path to current module.
1808 if (saved_jvm_path[0] != 0) {
1809 strcpy(buf, saved_jvm_path);
1810 return;
1811 }
1812
1813 buf[0] = '\0';
1814 if (Arguments::sun_java_launcher_is_altjvm()) {
1815 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1816 // for a JAVA_HOME environment variable and fix up the path so it
1817 // looks like jvm.dll is installed there (append a fake suffix
1818 // hotspot/jvm.dll).
1819 char* java_home_var = ::getenv("JAVA_HOME");
1820 if (java_home_var != NULL && java_home_var[0] != 0 &&
1821 strlen(java_home_var) < (size_t)buflen) {
1822 strncpy(buf, java_home_var, buflen);
1823
1824 // determine if this is a legacy image or modules image
1825 // modules image doesn't have "jre" subdirectory
1826 size_t len = strlen(buf);
1827 char* jrebin_p = buf + len;
1828 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1829 if (0 != _access(buf, 0)) {
1830 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1831 }
1832 len = strlen(buf);
1833 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1834 }
1835 }
1836
1837 if (buf[0] == '\0') {
1838 GetModuleFileName(vm_lib_handle, buf, buflen);
1839 }
1840 strncpy(saved_jvm_path, buf, MAX_PATH);
1841 saved_jvm_path[MAX_PATH - 1] = '\0';
1842 }
1843
1844
1845 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1846 #ifndef _WIN64
1847 st->print("_");
1848 #endif
1849 }
1850
1851
1852 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1853 #ifndef _WIN64
1854 st->print("@%d", args_size * sizeof(int));
1855 #endif
1856 }
1857
1858 // This method is a copy of JDK's sysGetLastErrorString
1859 // from src/windows/hpi/src/system_md.c
1860
1861 size_t os::lasterror(char* buf, size_t len) {
1862 DWORD errval;
1863
1864 if ((errval = GetLastError()) != 0) {
1865 // DOS error
1866 size_t n = (size_t)FormatMessage(
1867 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1868 NULL,
1869 errval,
1870 0,
1871 buf,
1872 (DWORD)len,
1873 NULL);
1874 if (n > 3) {
1875 // Drop final '.', CR, LF
1876 if (buf[n - 1] == '\n') n--;
1877 if (buf[n - 1] == '\r') n--;
1878 if (buf[n - 1] == '.') n--;
1879 buf[n] = '\0';
1880 }
1881 return n;
1882 }
1883
1884 if (errno != 0) {
1885 // C runtime error that has no corresponding DOS error code
1886 const char* s = strerror(errno);
1887 size_t n = strlen(s);
1888 if (n >= len) n = len - 1;
1889 strncpy(buf, s, n);
1890 buf[n] = '\0';
1891 return n;
1892 }
1893
1894 return 0;
1895 }
1896
1897 int os::get_last_error() {
1898 DWORD error = GetLastError();
1899 if (error == 0) {
1900 error = errno;
1901 }
1902 return (int)error;
1903 }
1904
1905 WindowsSemaphore::WindowsSemaphore(uint value) {
1906 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1907
1908 guarantee(_semaphore != NULL, err_msg("CreateSemaphore failed with error code: %lu", GetLastError()));
1909 }
1910
1911 WindowsSemaphore::~WindowsSemaphore() {
1912 ::CloseHandle(_semaphore);
1913 }
1914
1915 void WindowsSemaphore::signal(uint count) {
1916 if (count > 0) {
1917 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1918
1919 assert(ret != 0, err_msg("ReleaseSemaphore failed with error code: %lu", GetLastError()));
1920 }
1921 }
1922
1923 void WindowsSemaphore::wait() {
1924 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1925 assert(ret != WAIT_FAILED, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError()));
1926 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed with return value: %lu", ret));
1927 }
1928
1929 // sun.misc.Signal
1930 // NOTE that this is a workaround for an apparent kernel bug where if
1931 // a signal handler for SIGBREAK is installed then that signal handler
1932 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1933 // See bug 4416763.
1934 static void (*sigbreakHandler)(int) = NULL;
1935
1936 static void UserHandler(int sig, void *siginfo, void *context) {
1937 os::signal_notify(sig);
1938 // We need to reinstate the signal handler each time...
1939 os::signal(sig, (void*)UserHandler);
1940 }
1941
1942 void* os::user_handler() {
1943 return (void*) UserHandler;
1944 }
1945
1946 void* os::signal(int signal_number, void* handler) {
1947 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1948 void (*oldHandler)(int) = sigbreakHandler;
1949 sigbreakHandler = (void (*)(int)) handler;
1950 return (void*) oldHandler;
1951 } else {
1952 return (void*)::signal(signal_number, (void (*)(int))handler);
1953 }
1954 }
1955
1956 void os::signal_raise(int signal_number) {
1957 raise(signal_number);
1958 }
1959
1960 // The Win32 C runtime library maps all console control events other than ^C
1961 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1962 // logoff, and shutdown events. We therefore install our own console handler
1963 // that raises SIGTERM for the latter cases.
1964 //
1965 static BOOL WINAPI consoleHandler(DWORD event) {
1966 switch (event) {
1967 case CTRL_C_EVENT:
1968 if (is_error_reported()) {
1969 // Ctrl-C is pressed during error reporting, likely because the error
1970 // handler fails to abort. Let VM die immediately.
1971 os::die();
1972 }
1973
1974 os::signal_raise(SIGINT);
1975 return TRUE;
1976 break;
1977 case CTRL_BREAK_EVENT:
1978 if (sigbreakHandler != NULL) {
1979 (*sigbreakHandler)(SIGBREAK);
1980 }
1981 return TRUE;
1982 break;
1983 case CTRL_LOGOFF_EVENT: {
1984 // Don't terminate JVM if it is running in a non-interactive session,
1985 // such as a service process.
1986 USEROBJECTFLAGS flags;
1987 HANDLE handle = GetProcessWindowStation();
1988 if (handle != NULL &&
1989 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1990 sizeof(USEROBJECTFLAGS), NULL)) {
1991 // If it is a non-interactive session, let next handler to deal
1992 // with it.
1993 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1994 return FALSE;
1995 }
1996 }
1997 }
1998 case CTRL_CLOSE_EVENT:
1999 case CTRL_SHUTDOWN_EVENT:
2000 os::signal_raise(SIGTERM);
2001 return TRUE;
2002 break;
2003 default:
2004 break;
2005 }
2006 return FALSE;
2007 }
2008
2009 // The following code is moved from os.cpp for making this
2010 // code platform specific, which it is by its very nature.
2011
2012 // Return maximum OS signal used + 1 for internal use only
2013 // Used as exit signal for signal_thread
2014 int os::sigexitnum_pd() {
2015 return NSIG;
2016 }
2017
2018 // a counter for each possible signal value, including signal_thread exit signal
2019 static volatile jint pending_signals[NSIG+1] = { 0 };
2020 static HANDLE sig_sem = NULL;
2021
2022 void os::signal_init_pd() {
2023 // Initialize signal structures
2024 memset((void*)pending_signals, 0, sizeof(pending_signals));
2025
2026 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2027
2028 // Programs embedding the VM do not want it to attempt to receive
2029 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2030 // shutdown hooks mechanism introduced in 1.3. For example, when
2031 // the VM is run as part of a Windows NT service (i.e., a servlet
2032 // engine in a web server), the correct behavior is for any console
2033 // control handler to return FALSE, not TRUE, because the OS's
2034 // "final" handler for such events allows the process to continue if
2035 // it is a service (while terminating it if it is not a service).
2036 // To make this behavior uniform and the mechanism simpler, we
2037 // completely disable the VM's usage of these console events if -Xrs
2038 // (=ReduceSignalUsage) is specified. This means, for example, that
2039 // the CTRL-BREAK thread dump mechanism is also disabled in this
2040 // case. See bugs 4323062, 4345157, and related bugs.
2041
2042 if (!ReduceSignalUsage) {
2043 // Add a CTRL-C handler
2044 SetConsoleCtrlHandler(consoleHandler, TRUE);
2045 }
2046 }
2047
2048 void os::signal_notify(int signal_number) {
2049 BOOL ret;
2050 if (sig_sem != NULL) {
2051 Atomic::inc(&pending_signals[signal_number]);
2052 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2053 assert(ret != 0, "ReleaseSemaphore() failed");
2054 }
2055 }
2056
2057 static int check_pending_signals(bool wait_for_signal) {
2058 DWORD ret;
2059 while (true) {
2060 for (int i = 0; i < NSIG + 1; i++) {
2061 jint n = pending_signals[i];
2062 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2063 return i;
2064 }
2065 }
2066 if (!wait_for_signal) {
2067 return -1;
2068 }
2069
2070 JavaThread *thread = JavaThread::current();
2071
2072 ThreadBlockInVM tbivm(thread);
2073
2074 bool threadIsSuspended;
2075 do {
2076 thread->set_suspend_equivalent();
2077 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2078 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2079 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2080
2081 // were we externally suspended while we were waiting?
2082 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2083 if (threadIsSuspended) {
2084 // The semaphore has been incremented, but while we were waiting
2085 // another thread suspended us. We don't want to continue running
2086 // while suspended because that would surprise the thread that
2087 // suspended us.
2088 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2089 assert(ret != 0, "ReleaseSemaphore() failed");
2090
2091 thread->java_suspend_self();
2092 }
2093 } while (threadIsSuspended);
2094 }
2095 }
2096
2097 int os::signal_lookup() {
2098 return check_pending_signals(false);
2099 }
2100
2101 int os::signal_wait() {
2102 return check_pending_signals(true);
2103 }
2104
2105 // Implicit OS exception handling
2106
2107 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2108 address handler) {
2109 JavaThread* thread = JavaThread::current();
2110 // Save pc in thread
2111 #ifdef _M_IA64
2112 // Do not blow up if no thread info available.
2113 if (thread) {
2114 // Saving PRECISE pc (with slot information) in thread.
2115 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2116 // Convert precise PC into "Unix" format
2117 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2118 thread->set_saved_exception_pc((address)precise_pc);
2119 }
2120 // Set pc to handler
2121 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2122 // Clear out psr.ri (= Restart Instruction) in order to continue
2123 // at the beginning of the target bundle.
2124 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2125 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2126 #else
2127 #ifdef _M_AMD64
2128 // Do not blow up if no thread info available.
2129 if (thread) {
2130 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2131 }
2132 // Set pc to handler
2133 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2134 #else
2135 // Do not blow up if no thread info available.
2136 if (thread) {
2137 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2138 }
2139 // Set pc to handler
2140 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2141 #endif
2142 #endif
2143
2144 // Continue the execution
2145 return EXCEPTION_CONTINUE_EXECUTION;
2146 }
2147
2148
2149 // Used for PostMortemDump
2150 extern "C" void safepoints();
2151 extern "C" void find(int x);
2152 extern "C" void events();
2153
2154 // According to Windows API documentation, an illegal instruction sequence should generate
2155 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2156 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2157 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2158
2159 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2160
2161 // From "Execution Protection in the Windows Operating System" draft 0.35
2162 // Once a system header becomes available, the "real" define should be
2163 // included or copied here.
2164 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2165
2166 // Handle NAT Bit consumption on IA64.
2167 #ifdef _M_IA64
2168 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2169 #endif
2170
2171 // Windows Vista/2008 heap corruption check
2172 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2173
2174 #define def_excpt(val) #val, val
2175
2176 struct siglabel {
2177 char *name;
2178 int number;
2179 };
2180
2181 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2182 // C++ compiler contain this error code. Because this is a compiler-generated
2183 // error, the code is not listed in the Win32 API header files.
2184 // The code is actually a cryptic mnemonic device, with the initial "E"
2185 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2186 // ASCII values of "msc".
2187
2188 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2189
2190
2191 struct siglabel exceptlabels[] = {
2192 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2193 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2194 def_excpt(EXCEPTION_BREAKPOINT),
2195 def_excpt(EXCEPTION_SINGLE_STEP),
2196 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2197 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2198 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2199 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2200 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2201 def_excpt(EXCEPTION_FLT_OVERFLOW),
2202 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2203 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2204 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2205 def_excpt(EXCEPTION_INT_OVERFLOW),
2206 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2207 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2208 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2209 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2210 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2211 def_excpt(EXCEPTION_STACK_OVERFLOW),
2212 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2213 def_excpt(EXCEPTION_GUARD_PAGE),
2214 def_excpt(EXCEPTION_INVALID_HANDLE),
2215 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2216 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2217 #ifdef _M_IA64
2218 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2219 #endif
2220 NULL, 0
2221 };
2222
2223 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2224 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2225 if (exceptlabels[i].number == exception_code) {
2226 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2227 return buf;
2228 }
2229 }
2230
2231 return NULL;
2232 }
2233
2234 //-----------------------------------------------------------------------------
2235 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2236 // handle exception caused by idiv; should only happen for -MinInt/-1
2237 // (division by zero is handled explicitly)
2238 #ifdef _M_IA64
2239 assert(0, "Fix Handle_IDiv_Exception");
2240 #else
2241 #ifdef _M_AMD64
2242 PCONTEXT ctx = exceptionInfo->ContextRecord;
2243 address pc = (address)ctx->Rip;
2244 assert(pc[0] == 0xF7, "not an idiv opcode");
2245 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2246 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2247 // set correct result values and continue after idiv instruction
2248 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2249 ctx->Rax = (DWORD)min_jint; // result
2250 ctx->Rdx = (DWORD)0; // remainder
2251 // Continue the execution
2252 #else
2253 PCONTEXT ctx = exceptionInfo->ContextRecord;
2254 address pc = (address)ctx->Eip;
2255 assert(pc[0] == 0xF7, "not an idiv opcode");
2256 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2257 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2258 // set correct result values and continue after idiv instruction
2259 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2260 ctx->Eax = (DWORD)min_jint; // result
2261 ctx->Edx = (DWORD)0; // remainder
2262 // Continue the execution
2263 #endif
2264 #endif
2265 return EXCEPTION_CONTINUE_EXECUTION;
2266 }
2267
2268 //-----------------------------------------------------------------------------
2269 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2270 PCONTEXT ctx = exceptionInfo->ContextRecord;
2271 #ifndef _WIN64
2272 // handle exception caused by native method modifying control word
2273 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2274
2275 switch (exception_code) {
2276 case EXCEPTION_FLT_DENORMAL_OPERAND:
2277 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2278 case EXCEPTION_FLT_INEXACT_RESULT:
2279 case EXCEPTION_FLT_INVALID_OPERATION:
2280 case EXCEPTION_FLT_OVERFLOW:
2281 case EXCEPTION_FLT_STACK_CHECK:
2282 case EXCEPTION_FLT_UNDERFLOW:
2283 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2284 if (fp_control_word != ctx->FloatSave.ControlWord) {
2285 // Restore FPCW and mask out FLT exceptions
2286 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2287 // Mask out pending FLT exceptions
2288 ctx->FloatSave.StatusWord &= 0xffffff00;
2289 return EXCEPTION_CONTINUE_EXECUTION;
2290 }
2291 }
2292
2293 if (prev_uef_handler != NULL) {
2294 // We didn't handle this exception so pass it to the previous
2295 // UnhandledExceptionFilter.
2296 return (prev_uef_handler)(exceptionInfo);
2297 }
2298 #else // !_WIN64
2299 // On Windows, the mxcsr control bits are non-volatile across calls
2300 // See also CR 6192333
2301 //
2302 jint MxCsr = INITIAL_MXCSR;
2303 // we can't use StubRoutines::addr_mxcsr_std()
2304 // because in Win64 mxcsr is not saved there
2305 if (MxCsr != ctx->MxCsr) {
2306 ctx->MxCsr = MxCsr;
2307 return EXCEPTION_CONTINUE_EXECUTION;
2308 }
2309 #endif // !_WIN64
2310
2311 return EXCEPTION_CONTINUE_SEARCH;
2312 }
2313
2314 static inline void report_error(Thread* t, DWORD exception_code,
2315 address addr, void* siginfo, void* context) {
2316 VMError err(t, exception_code, addr, siginfo, context);
2317 err.report_and_die();
2318
2319 // If UseOsErrorReporting, this will return here and save the error file
2320 // somewhere where we can find it in the minidump.
2321 }
2322
2323 //-----------------------------------------------------------------------------
2324 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2325 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2326 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2327 #ifdef _M_IA64
2328 // On Itanium, we need the "precise pc", which has the slot number coded
2329 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2330 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2331 // Convert the pc to "Unix format", which has the slot number coded
2332 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2333 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2334 // information is saved in the Unix format.
2335 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2336 #else
2337 #ifdef _M_AMD64
2338 address pc = (address) exceptionInfo->ContextRecord->Rip;
2339 #else
2340 address pc = (address) exceptionInfo->ContextRecord->Eip;
2341 #endif
2342 #endif
2343 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2344
2345 // Handle SafeFetch32 and SafeFetchN exceptions.
2346 if (StubRoutines::is_safefetch_fault(pc)) {
2347 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2348 }
2349
2350 #ifndef _WIN64
2351 // Execution protection violation - win32 running on AMD64 only
2352 // Handled first to avoid misdiagnosis as a "normal" access violation;
2353 // This is safe to do because we have a new/unique ExceptionInformation
2354 // code for this condition.
2355 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2356 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2357 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2358 address addr = (address) exceptionRecord->ExceptionInformation[1];
2359
2360 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2361 int page_size = os::vm_page_size();
2362
2363 // Make sure the pc and the faulting address are sane.
2364 //
2365 // If an instruction spans a page boundary, and the page containing
2366 // the beginning of the instruction is executable but the following
2367 // page is not, the pc and the faulting address might be slightly
2368 // different - we still want to unguard the 2nd page in this case.
2369 //
2370 // 15 bytes seems to be a (very) safe value for max instruction size.
2371 bool pc_is_near_addr =
2372 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2373 bool instr_spans_page_boundary =
2374 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2375 (intptr_t) page_size) > 0);
2376
2377 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2378 static volatile address last_addr =
2379 (address) os::non_memory_address_word();
2380
2381 // In conservative mode, don't unguard unless the address is in the VM
2382 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2383 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2384
2385 // Set memory to RWX and retry
2386 address page_start =
2387 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2388 bool res = os::protect_memory((char*) page_start, page_size,
2389 os::MEM_PROT_RWX);
2390
2391 if (PrintMiscellaneous && Verbose) {
2392 char buf[256];
2393 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2394 "at " INTPTR_FORMAT
2395 ", unguarding " INTPTR_FORMAT ": %s", addr,
2396 page_start, (res ? "success" : strerror(errno)));
2397 tty->print_raw_cr(buf);
2398 }
2399
2400 // Set last_addr so if we fault again at the same address, we don't
2401 // end up in an endless loop.
2402 //
2403 // There are two potential complications here. Two threads trapping
2404 // at the same address at the same time could cause one of the
2405 // threads to think it already unguarded, and abort the VM. Likely
2406 // very rare.
2407 //
2408 // The other race involves two threads alternately trapping at
2409 // different addresses and failing to unguard the page, resulting in
2410 // an endless loop. This condition is probably even more unlikely
2411 // than the first.
2412 //
2413 // Although both cases could be avoided by using locks or thread
2414 // local last_addr, these solutions are unnecessary complication:
2415 // this handler is a best-effort safety net, not a complete solution.
2416 // It is disabled by default and should only be used as a workaround
2417 // in case we missed any no-execute-unsafe VM code.
2418
2419 last_addr = addr;
2420
2421 return EXCEPTION_CONTINUE_EXECUTION;
2422 }
2423 }
2424
2425 // Last unguard failed or not unguarding
2426 tty->print_raw_cr("Execution protection violation");
2427 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2428 exceptionInfo->ContextRecord);
2429 return EXCEPTION_CONTINUE_SEARCH;
2430 }
2431 }
2432 #endif // _WIN64
2433
2434 // Check to see if we caught the safepoint code in the
2435 // process of write protecting the memory serialization page.
2436 // It write enables the page immediately after protecting it
2437 // so just return.
2438 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2439 JavaThread* thread = (JavaThread*) t;
2440 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2441 address addr = (address) exceptionRecord->ExceptionInformation[1];
2442 if (os::is_memory_serialize_page(thread, addr)) {
2443 // Block current thread until the memory serialize page permission restored.
2444 os::block_on_serialize_page_trap();
2445 return EXCEPTION_CONTINUE_EXECUTION;
2446 }
2447 }
2448
2449 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2450 VM_Version::is_cpuinfo_segv_addr(pc)) {
2451 // Verify that OS save/restore AVX registers.
2452 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2453 }
2454
2455 if (t != NULL && t->is_Java_thread()) {
2456 JavaThread* thread = (JavaThread*) t;
2457 bool in_java = thread->thread_state() == _thread_in_Java;
2458
2459 // Handle potential stack overflows up front.
2460 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2461 if (os::uses_stack_guard_pages()) {
2462 #ifdef _M_IA64
2463 // Use guard page for register stack.
2464 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2465 address addr = (address) exceptionRecord->ExceptionInformation[1];
2466 // Check for a register stack overflow on Itanium
2467 if (thread->addr_inside_register_stack_red_zone(addr)) {
2468 // Fatal red zone violation happens if the Java program
2469 // catches a StackOverflow error and does so much processing
2470 // that it runs beyond the unprotected yellow guard zone. As
2471 // a result, we are out of here.
2472 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2473 } else if(thread->addr_inside_register_stack(addr)) {
2474 // Disable the yellow zone which sets the state that
2475 // we've got a stack overflow problem.
2476 if (thread->stack_yellow_zone_enabled()) {
2477 thread->disable_stack_yellow_zone();
2478 }
2479 // Give us some room to process the exception.
2480 thread->disable_register_stack_guard();
2481 // Tracing with +Verbose.
2482 if (Verbose) {
2483 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2484 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2485 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2486 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2487 thread->register_stack_base(),
2488 thread->register_stack_base() + thread->stack_size());
2489 }
2490
2491 // Reguard the permanent register stack red zone just to be sure.
2492 // We saw Windows silently disabling this without telling us.
2493 thread->enable_register_stack_red_zone();
2494
2495 return Handle_Exception(exceptionInfo,
2496 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2497 }
2498 #endif
2499 if (thread->stack_yellow_zone_enabled()) {
2500 // Yellow zone violation. The o/s has unprotected the first yellow
2501 // zone page for us. Note: must call disable_stack_yellow_zone to
2502 // update the enabled status, even if the zone contains only one page.
2503 thread->disable_stack_yellow_zone();
2504 // If not in java code, return and hope for the best.
2505 return in_java
2506 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2507 : EXCEPTION_CONTINUE_EXECUTION;
2508 } else {
2509 // Fatal red zone violation.
2510 thread->disable_stack_red_zone();
2511 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2512 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2513 exceptionInfo->ContextRecord);
2514 return EXCEPTION_CONTINUE_SEARCH;
2515 }
2516 } else if (in_java) {
2517 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2518 // a one-time-only guard page, which it has released to us. The next
2519 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2520 return Handle_Exception(exceptionInfo,
2521 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2522 } else {
2523 // Can only return and hope for the best. Further stack growth will
2524 // result in an ACCESS_VIOLATION.
2525 return EXCEPTION_CONTINUE_EXECUTION;
2526 }
2527 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2528 // Either stack overflow or null pointer exception.
2529 if (in_java) {
2530 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2531 address addr = (address) exceptionRecord->ExceptionInformation[1];
2532 address stack_end = thread->stack_base() - thread->stack_size();
2533 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2534 // Stack overflow.
2535 assert(!os::uses_stack_guard_pages(),
2536 "should be caught by red zone code above.");
2537 return Handle_Exception(exceptionInfo,
2538 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2539 }
2540 // Check for safepoint polling and implicit null
2541 // We only expect null pointers in the stubs (vtable)
2542 // the rest are checked explicitly now.
2543 CodeBlob* cb = CodeCache::find_blob(pc);
2544 if (cb != NULL) {
2545 if (os::is_poll_address(addr)) {
2546 address stub = SharedRuntime::get_poll_stub(pc);
2547 return Handle_Exception(exceptionInfo, stub);
2548 }
2549 }
2550 {
2551 #ifdef _WIN64
2552 // If it's a legal stack address map the entire region in
2553 //
2554 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2555 address addr = (address) exceptionRecord->ExceptionInformation[1];
2556 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2557 addr = (address)((uintptr_t)addr &
2558 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2559 os::commit_memory((char *)addr, thread->stack_base() - addr,
2560 !ExecMem);
2561 return EXCEPTION_CONTINUE_EXECUTION;
2562 } else
2563 #endif
2564 {
2565 // Null pointer exception.
2566 #ifdef _M_IA64
2567 // Process implicit null checks in compiled code. Note: Implicit null checks
2568 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2569 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2570 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2571 // Handle implicit null check in UEP method entry
2572 if (cb && (cb->is_frame_complete_at(pc) ||
2573 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2574 if (Verbose) {
2575 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2576 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2577 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2578 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2579 *(bundle_start + 1), *bundle_start);
2580 }
2581 return Handle_Exception(exceptionInfo,
2582 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2583 }
2584 }
2585
2586 // Implicit null checks were processed above. Hence, we should not reach
2587 // here in the usual case => die!
2588 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2589 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2590 exceptionInfo->ContextRecord);
2591 return EXCEPTION_CONTINUE_SEARCH;
2592
2593 #else // !IA64
2594
2595 // Windows 98 reports faulting addresses incorrectly
2596 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2597 !os::win32::is_nt()) {
2598 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2599 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2600 }
2601 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2602 exceptionInfo->ContextRecord);
2603 return EXCEPTION_CONTINUE_SEARCH;
2604 #endif
2605 }
2606 }
2607 }
2608
2609 #ifdef _WIN64
2610 // Special care for fast JNI field accessors.
2611 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2612 // in and the heap gets shrunk before the field access.
2613 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2614 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2615 if (addr != (address)-1) {
2616 return Handle_Exception(exceptionInfo, addr);
2617 }
2618 }
2619 #endif
2620
2621 // Stack overflow or null pointer exception in native code.
2622 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2623 exceptionInfo->ContextRecord);
2624 return EXCEPTION_CONTINUE_SEARCH;
2625 } // /EXCEPTION_ACCESS_VIOLATION
2626 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2627 #if defined _M_IA64
2628 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2629 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2630 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2631
2632 // Compiled method patched to be non entrant? Following conditions must apply:
2633 // 1. must be first instruction in bundle
2634 // 2. must be a break instruction with appropriate code
2635 if ((((uint64_t) pc & 0x0F) == 0) &&
2636 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2637 return Handle_Exception(exceptionInfo,
2638 (address)SharedRuntime::get_handle_wrong_method_stub());
2639 }
2640 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2641 #endif
2642
2643
2644 if (in_java) {
2645 switch (exception_code) {
2646 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2647 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2648
2649 case EXCEPTION_INT_OVERFLOW:
2650 return Handle_IDiv_Exception(exceptionInfo);
2651
2652 } // switch
2653 }
2654 if (((thread->thread_state() == _thread_in_Java) ||
2655 (thread->thread_state() == _thread_in_native)) &&
2656 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2657 LONG result=Handle_FLT_Exception(exceptionInfo);
2658 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2659 }
2660 }
2661
2662 if (exception_code != EXCEPTION_BREAKPOINT) {
2663 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2664 exceptionInfo->ContextRecord);
2665 }
2666 return EXCEPTION_CONTINUE_SEARCH;
2667 }
2668
2669 #ifndef _WIN64
2670 // Special care for fast JNI accessors.
2671 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2672 // the heap gets shrunk before the field access.
2673 // Need to install our own structured exception handler since native code may
2674 // install its own.
2675 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2676 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2677 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2678 address pc = (address) exceptionInfo->ContextRecord->Eip;
2679 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2680 if (addr != (address)-1) {
2681 return Handle_Exception(exceptionInfo, addr);
2682 }
2683 }
2684 return EXCEPTION_CONTINUE_SEARCH;
2685 }
2686
2687 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2688 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2689 jobject obj, \
2690 jfieldID fieldID) { \
2691 __try { \
2692 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2693 obj, \
2694 fieldID); \
2695 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2696 _exception_info())) { \
2697 } \
2698 return 0; \
2699 }
2700
2701 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2702 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2703 DEFINE_FAST_GETFIELD(jchar, char, Char)
2704 DEFINE_FAST_GETFIELD(jshort, short, Short)
2705 DEFINE_FAST_GETFIELD(jint, int, Int)
2706 DEFINE_FAST_GETFIELD(jlong, long, Long)
2707 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2708 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2709
2710 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2711 switch (type) {
2712 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2713 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2714 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2715 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2716 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2717 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2718 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2719 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2720 default: ShouldNotReachHere();
2721 }
2722 return (address)-1;
2723 }
2724 #endif
2725
2726 // Virtual Memory
2727
2728 int os::vm_page_size() { return os::win32::vm_page_size(); }
2729 int os::vm_allocation_granularity() {
2730 return os::win32::vm_allocation_granularity();
2731 }
2732
2733 // Windows large page support is available on Windows 2003. In order to use
2734 // large page memory, the administrator must first assign additional privilege
2735 // to the user:
2736 // + select Control Panel -> Administrative Tools -> Local Security Policy
2737 // + select Local Policies -> User Rights Assignment
2738 // + double click "Lock pages in memory", add users and/or groups
2739 // + reboot
2740 // Note the above steps are needed for administrator as well, as administrators
2741 // by default do not have the privilege to lock pages in memory.
2742 //
2743 // Note about Windows 2003: although the API supports committing large page
2744 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2745 // scenario, I found through experiment it only uses large page if the entire
2746 // memory region is reserved and committed in a single VirtualAlloc() call.
2747 // This makes Windows large page support more or less like Solaris ISM, in
2748 // that the entire heap must be committed upfront. This probably will change
2749 // in the future, if so the code below needs to be revisited.
2750
2751 #ifndef MEM_LARGE_PAGES
2752 #define MEM_LARGE_PAGES 0x20000000
2753 #endif
2754
2755 static HANDLE _hProcess;
2756 static HANDLE _hToken;
2757
2758 // Container for NUMA node list info
2759 class NUMANodeListHolder {
2760 private:
2761 int *_numa_used_node_list; // allocated below
2762 int _numa_used_node_count;
2763
2764 void free_node_list() {
2765 if (_numa_used_node_list != NULL) {
2766 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2767 }
2768 }
2769
2770 public:
2771 NUMANodeListHolder() {
2772 _numa_used_node_count = 0;
2773 _numa_used_node_list = NULL;
2774 // do rest of initialization in build routine (after function pointers are set up)
2775 }
2776
2777 ~NUMANodeListHolder() {
2778 free_node_list();
2779 }
2780
2781 bool build() {
2782 DWORD_PTR proc_aff_mask;
2783 DWORD_PTR sys_aff_mask;
2784 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2785 ULONG highest_node_number;
2786 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2787 free_node_list();
2788 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2789 for (unsigned int i = 0; i <= highest_node_number; i++) {
2790 ULONGLONG proc_mask_numa_node;
2791 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2792 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2793 _numa_used_node_list[_numa_used_node_count++] = i;
2794 }
2795 }
2796 return (_numa_used_node_count > 1);
2797 }
2798
2799 int get_count() { return _numa_used_node_count; }
2800 int get_node_list_entry(int n) {
2801 // for indexes out of range, returns -1
2802 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2803 }
2804
2805 } numa_node_list_holder;
2806
2807
2808
2809 static size_t _large_page_size = 0;
2810
2811 static bool resolve_functions_for_large_page_init() {
2812 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2813 os::Advapi32Dll::AdvapiAvailable();
2814 }
2815
2816 static bool request_lock_memory_privilege() {
2817 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2818 os::current_process_id());
2819
2820 LUID luid;
2821 if (_hProcess != NULL &&
2822 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2823 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2824
2825 TOKEN_PRIVILEGES tp;
2826 tp.PrivilegeCount = 1;
2827 tp.Privileges[0].Luid = luid;
2828 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2829
2830 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2831 // privilege. Check GetLastError() too. See MSDN document.
2832 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2833 (GetLastError() == ERROR_SUCCESS)) {
2834 return true;
2835 }
2836 }
2837
2838 return false;
2839 }
2840
2841 static void cleanup_after_large_page_init() {
2842 if (_hProcess) CloseHandle(_hProcess);
2843 _hProcess = NULL;
2844 if (_hToken) CloseHandle(_hToken);
2845 _hToken = NULL;
2846 }
2847
2848 static bool numa_interleaving_init() {
2849 bool success = false;
2850 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2851
2852 // print a warning if UseNUMAInterleaving flag is specified on command line
2853 bool warn_on_failure = use_numa_interleaving_specified;
2854 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2855
2856 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2857 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2858 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2859
2860 if (os::Kernel32Dll::NumaCallsAvailable()) {
2861 if (numa_node_list_holder.build()) {
2862 if (PrintMiscellaneous && Verbose) {
2863 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2864 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2865 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2866 }
2867 tty->print("\n");
2868 }
2869 success = true;
2870 } else {
2871 WARN("Process does not cover multiple NUMA nodes.");
2872 }
2873 } else {
2874 WARN("NUMA Interleaving is not supported by the operating system.");
2875 }
2876 if (!success) {
2877 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2878 }
2879 return success;
2880 #undef WARN
2881 }
2882
2883 // this routine is used whenever we need to reserve a contiguous VA range
2884 // but we need to make separate VirtualAlloc calls for each piece of the range
2885 // Reasons for doing this:
2886 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2887 // * UseNUMAInterleaving requires a separate node for each piece
2888 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2889 DWORD prot,
2890 bool should_inject_error = false) {
2891 char * p_buf;
2892 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2893 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2894 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2895
2896 // first reserve enough address space in advance since we want to be
2897 // able to break a single contiguous virtual address range into multiple
2898 // large page commits but WS2003 does not allow reserving large page space
2899 // so we just use 4K pages for reserve, this gives us a legal contiguous
2900 // address space. then we will deallocate that reservation, and re alloc
2901 // using large pages
2902 const size_t size_of_reserve = bytes + chunk_size;
2903 if (bytes > size_of_reserve) {
2904 // Overflowed.
2905 return NULL;
2906 }
2907 p_buf = (char *) VirtualAlloc(addr,
2908 size_of_reserve, // size of Reserve
2909 MEM_RESERVE,
2910 PAGE_READWRITE);
2911 // If reservation failed, return NULL
2912 if (p_buf == NULL) return NULL;
2913 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2914 os::release_memory(p_buf, bytes + chunk_size);
2915
2916 // we still need to round up to a page boundary (in case we are using large pages)
2917 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2918 // instead we handle this in the bytes_to_rq computation below
2919 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2920
2921 // now go through and allocate one chunk at a time until all bytes are
2922 // allocated
2923 size_t bytes_remaining = bytes;
2924 // An overflow of align_size_up() would have been caught above
2925 // in the calculation of size_of_reserve.
2926 char * next_alloc_addr = p_buf;
2927 HANDLE hProc = GetCurrentProcess();
2928
2929 #ifdef ASSERT
2930 // Variable for the failure injection
2931 long ran_num = os::random();
2932 size_t fail_after = ran_num % bytes;
2933 #endif
2934
2935 int count=0;
2936 while (bytes_remaining) {
2937 // select bytes_to_rq to get to the next chunk_size boundary
2938
2939 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2940 // Note allocate and commit
2941 char * p_new;
2942
2943 #ifdef ASSERT
2944 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2945 #else
2946 const bool inject_error_now = false;
2947 #endif
2948
2949 if (inject_error_now) {
2950 p_new = NULL;
2951 } else {
2952 if (!UseNUMAInterleaving) {
2953 p_new = (char *) VirtualAlloc(next_alloc_addr,
2954 bytes_to_rq,
2955 flags,
2956 prot);
2957 } else {
2958 // get the next node to use from the used_node_list
2959 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2960 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2961 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2962 next_alloc_addr,
2963 bytes_to_rq,
2964 flags,
2965 prot,
2966 node);
2967 }
2968 }
2969
2970 if (p_new == NULL) {
2971 // Free any allocated pages
2972 if (next_alloc_addr > p_buf) {
2973 // Some memory was committed so release it.
2974 size_t bytes_to_release = bytes - bytes_remaining;
2975 // NMT has yet to record any individual blocks, so it
2976 // need to create a dummy 'reserve' record to match
2977 // the release.
2978 MemTracker::record_virtual_memory_reserve((address)p_buf,
2979 bytes_to_release, CALLER_PC);
2980 os::release_memory(p_buf, bytes_to_release);
2981 }
2982 #ifdef ASSERT
2983 if (should_inject_error) {
2984 if (TracePageSizes && Verbose) {
2985 tty->print_cr("Reserving pages individually failed.");
2986 }
2987 }
2988 #endif
2989 return NULL;
2990 }
2991
2992 bytes_remaining -= bytes_to_rq;
2993 next_alloc_addr += bytes_to_rq;
2994 count++;
2995 }
2996 // Although the memory is allocated individually, it is returned as one.
2997 // NMT records it as one block.
2998 if ((flags & MEM_COMMIT) != 0) {
2999 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3000 } else {
3001 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3002 }
3003
3004 // made it this far, success
3005 return p_buf;
3006 }
3007
3008
3009
3010 void os::large_page_init() {
3011 if (!UseLargePages) return;
3012
3013 // print a warning if any large page related flag is specified on command line
3014 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3015 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3016 bool success = false;
3017
3018 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3019 if (resolve_functions_for_large_page_init()) {
3020 if (request_lock_memory_privilege()) {
3021 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3022 if (s) {
3023 #if defined(IA32) || defined(AMD64)
3024 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3025 WARN("JVM cannot use large pages bigger than 4mb.");
3026 } else {
3027 #endif
3028 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3029 _large_page_size = LargePageSizeInBytes;
3030 } else {
3031 _large_page_size = s;
3032 }
3033 success = true;
3034 #if defined(IA32) || defined(AMD64)
3035 }
3036 #endif
3037 } else {
3038 WARN("Large page is not supported by the processor.");
3039 }
3040 } else {
3041 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3042 }
3043 } else {
3044 WARN("Large page is not supported by the operating system.");
3045 }
3046 #undef WARN
3047
3048 const size_t default_page_size = (size_t) vm_page_size();
3049 if (success && _large_page_size > default_page_size) {
3050 _page_sizes[0] = _large_page_size;
3051 _page_sizes[1] = default_page_size;
3052 _page_sizes[2] = 0;
3053 }
3054
3055 cleanup_after_large_page_init();
3056 UseLargePages = success;
3057 }
3058
3059 // On win32, one cannot release just a part of reserved memory, it's an
3060 // all or nothing deal. When we split a reservation, we must break the
3061 // reservation into two reservations.
3062 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3063 bool realloc) {
3064 if (size > 0) {
3065 release_memory(base, size);
3066 if (realloc) {
3067 reserve_memory(split, base);
3068 }
3069 if (size != split) {
3070 reserve_memory(size - split, base + split);
3071 }
3072 }
3073 }
3074
3075 // Multiple threads can race in this code but it's not possible to unmap small sections of
3076 // virtual space to get requested alignment, like posix-like os's.
3077 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3078 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3079 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3080 "Alignment must be a multiple of allocation granularity (page size)");
3081 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3082
3083 size_t extra_size = size + alignment;
3084 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3085
3086 char* aligned_base = NULL;
3087
3088 do {
3089 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3090 if (extra_base == NULL) {
3091 return NULL;
3092 }
3093 // Do manual alignment
3094 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3095
3096 os::release_memory(extra_base, extra_size);
3097
3098 aligned_base = os::reserve_memory(size, aligned_base);
3099
3100 } while (aligned_base == NULL);
3101
3102 return aligned_base;
3103 }
3104
3105 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3106 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3107 "reserve alignment");
3108 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3109 char* res;
3110 // note that if UseLargePages is on, all the areas that require interleaving
3111 // will go thru reserve_memory_special rather than thru here.
3112 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3113 if (!use_individual) {
3114 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3115 } else {
3116 elapsedTimer reserveTimer;
3117 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3118 // in numa interleaving, we have to allocate pages individually
3119 // (well really chunks of NUMAInterleaveGranularity size)
3120 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3121 if (res == NULL) {
3122 warning("NUMA page allocation failed");
3123 }
3124 if (Verbose && PrintMiscellaneous) {
3125 reserveTimer.stop();
3126 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3127 reserveTimer.milliseconds(), reserveTimer.ticks());
3128 }
3129 }
3130 assert(res == NULL || addr == NULL || addr == res,
3131 "Unexpected address from reserve.");
3132
3133 return res;
3134 }
3135
3136 // Reserve memory at an arbitrary address, only if that area is
3137 // available (and not reserved for something else).
3138 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3139 // Windows os::reserve_memory() fails of the requested address range is
3140 // not avilable.
3141 return reserve_memory(bytes, requested_addr);
3142 }
3143
3144 size_t os::large_page_size() {
3145 return _large_page_size;
3146 }
3147
3148 bool os::can_commit_large_page_memory() {
3149 // Windows only uses large page memory when the entire region is reserved
3150 // and committed in a single VirtualAlloc() call. This may change in the
3151 // future, but with Windows 2003 it's not possible to commit on demand.
3152 return false;
3153 }
3154
3155 bool os::can_execute_large_page_memory() {
3156 return true;
3157 }
3158
3159 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3160 bool exec) {
3161 assert(UseLargePages, "only for large pages");
3162
3163 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3164 return NULL; // Fallback to small pages.
3165 }
3166
3167 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3168 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3169
3170 // with large pages, there are two cases where we need to use Individual Allocation
3171 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3172 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3173 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3174 if (TracePageSizes && Verbose) {
3175 tty->print_cr("Reserving large pages individually.");
3176 }
3177 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3178 if (p_buf == NULL) {
3179 // give an appropriate warning message
3180 if (UseNUMAInterleaving) {
3181 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3182 }
3183 if (UseLargePagesIndividualAllocation) {
3184 warning("Individually allocated large pages failed, "
3185 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3186 }
3187 return NULL;
3188 }
3189
3190 return p_buf;
3191
3192 } else {
3193 if (TracePageSizes && Verbose) {
3194 tty->print_cr("Reserving large pages in a single large chunk.");
3195 }
3196 // normal policy just allocate it all at once
3197 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3198 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3199 if (res != NULL) {
3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3201 }
3202
3203 return res;
3204 }
3205 }
3206
3207 bool os::release_memory_special(char* base, size_t bytes) {
3208 assert(base != NULL, "Sanity check");
3209 return release_memory(base, bytes);
3210 }
3211
3212 void os::print_statistics() {
3213 }
3214
3215 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3216 int err = os::get_last_error();
3217 char buf[256];
3218 size_t buf_len = os::lasterror(buf, sizeof(buf));
3219 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3220 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3221 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3222 }
3223
3224 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3225 if (bytes == 0) {
3226 // Don't bother the OS with noops.
3227 return true;
3228 }
3229 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3230 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3231 // Don't attempt to print anything if the OS call fails. We're
3232 // probably low on resources, so the print itself may cause crashes.
3233
3234 // unless we have NUMAInterleaving enabled, the range of a commit
3235 // is always within a reserve covered by a single VirtualAlloc
3236 // in that case we can just do a single commit for the requested size
3237 if (!UseNUMAInterleaving) {
3238 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3239 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3240 return false;
3241 }
3242 if (exec) {
3243 DWORD oldprot;
3244 // Windows doc says to use VirtualProtect to get execute permissions
3245 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3246 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3247 return false;
3248 }
3249 }
3250 return true;
3251 } else {
3252
3253 // when NUMAInterleaving is enabled, the commit might cover a range that
3254 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3255 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3256 // returns represents the number of bytes that can be committed in one step.
3257 size_t bytes_remaining = bytes;
3258 char * next_alloc_addr = addr;
3259 while (bytes_remaining > 0) {
3260 MEMORY_BASIC_INFORMATION alloc_info;
3261 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3262 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3263 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3264 PAGE_READWRITE) == NULL) {
3265 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3266 exec);)
3267 return false;
3268 }
3269 if (exec) {
3270 DWORD oldprot;
3271 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3272 PAGE_EXECUTE_READWRITE, &oldprot)) {
3273 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3274 exec);)
3275 return false;
3276 }
3277 }
3278 bytes_remaining -= bytes_to_rq;
3279 next_alloc_addr += bytes_to_rq;
3280 }
3281 }
3282 // if we made it this far, return true
3283 return true;
3284 }
3285
3286 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3287 bool exec) {
3288 // alignment_hint is ignored on this OS
3289 return pd_commit_memory(addr, size, exec);
3290 }
3291
3292 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3293 const char* mesg) {
3294 assert(mesg != NULL, "mesg must be specified");
3295 if (!pd_commit_memory(addr, size, exec)) {
3296 warn_fail_commit_memory(addr, size, exec);
3297 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3298 }
3299 }
3300
3301 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3302 size_t alignment_hint, bool exec,
3303 const char* mesg) {
3304 // alignment_hint is ignored on this OS
3305 pd_commit_memory_or_exit(addr, size, exec, mesg);
3306 }
3307
3308 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3309 if (bytes == 0) {
3310 // Don't bother the OS with noops.
3311 return true;
3312 }
3313 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3314 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3315 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3316 }
3317
3318 bool os::pd_release_memory(char* addr, size_t bytes) {
3319 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3320 }
3321
3322 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3323 return os::commit_memory(addr, size, !ExecMem);
3324 }
3325
3326 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3327 return os::uncommit_memory(addr, size);
3328 }
3329
3330 // Set protections specified
3331 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3332 bool is_committed) {
3333 unsigned int p = 0;
3334 switch (prot) {
3335 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3336 case MEM_PROT_READ: p = PAGE_READONLY; break;
3337 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3338 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3339 default:
3340 ShouldNotReachHere();
3341 }
3342
3343 DWORD old_status;
3344
3345 // Strange enough, but on Win32 one can change protection only for committed
3346 // memory, not a big deal anyway, as bytes less or equal than 64K
3347 if (!is_committed) {
3348 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3349 "cannot commit protection page");
3350 }
3351 // One cannot use os::guard_memory() here, as on Win32 guard page
3352 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3353 //
3354 // Pages in the region become guard pages. Any attempt to access a guard page
3355 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3356 // the guard page status. Guard pages thus act as a one-time access alarm.
3357 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3358 }
3359
3360 bool os::guard_memory(char* addr, size_t bytes) {
3361 DWORD old_status;
3362 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3363 }
3364
3365 bool os::unguard_memory(char* addr, size_t bytes) {
3366 DWORD old_status;
3367 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3368 }
3369
3370 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3371 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3372 void os::numa_make_global(char *addr, size_t bytes) { }
3373 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3374 bool os::numa_topology_changed() { return false; }
3375 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3376 int os::numa_get_group_id() { return 0; }
3377 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3378 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3379 // Provide an answer for UMA systems
3380 ids[0] = 0;
3381 return 1;
3382 } else {
3383 // check for size bigger than actual groups_num
3384 size = MIN2(size, numa_get_groups_num());
3385 for (int i = 0; i < (int)size; i++) {
3386 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3387 }
3388 return size;
3389 }
3390 }
3391
3392 bool os::get_page_info(char *start, page_info* info) {
3393 return false;
3394 }
3395
3396 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3397 page_info* page_found) {
3398 return end;
3399 }
3400
3401 char* os::non_memory_address_word() {
3402 // Must never look like an address returned by reserve_memory,
3403 // even in its subfields (as defined by the CPU immediate fields,
3404 // if the CPU splits constants across multiple instructions).
3405 return (char*)-1;
3406 }
3407
3408 #define MAX_ERROR_COUNT 100
3409 #define SYS_THREAD_ERROR 0xffffffffUL
3410
3411 void os::pd_start_thread(Thread* thread) {
3412 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3413 // Returns previous suspend state:
3414 // 0: Thread was not suspended
3415 // 1: Thread is running now
3416 // >1: Thread is still suspended.
3417 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3418 }
3419
3420 class HighResolutionInterval : public CHeapObj<mtThread> {
3421 // The default timer resolution seems to be 10 milliseconds.
3422 // (Where is this written down?)
3423 // If someone wants to sleep for only a fraction of the default,
3424 // then we set the timer resolution down to 1 millisecond for
3425 // the duration of their interval.
3426 // We carefully set the resolution back, since otherwise we
3427 // seem to incur an overhead (3%?) that we don't need.
3428 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3429 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3430 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3431 // timeBeginPeriod() if the relative error exceeded some threshold.
3432 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3433 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3434 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3435 // resolution timers running.
3436 private:
3437 jlong resolution;
3438 public:
3439 HighResolutionInterval(jlong ms) {
3440 resolution = ms % 10L;
3441 if (resolution != 0) {
3442 MMRESULT result = timeBeginPeriod(1L);
3443 }
3444 }
3445 ~HighResolutionInterval() {
3446 if (resolution != 0) {
3447 MMRESULT result = timeEndPeriod(1L);
3448 }
3449 resolution = 0L;
3450 }
3451 };
3452
3453 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3454 jlong limit = (jlong) MAXDWORD;
3455
3456 while (ms > limit) {
3457 int res;
3458 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3459 return res;
3460 }
3461 ms -= limit;
3462 }
3463
3464 assert(thread == Thread::current(), "thread consistency check");
3465 OSThread* osthread = thread->osthread();
3466 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3467 int result;
3468 if (interruptable) {
3469 assert(thread->is_Java_thread(), "must be java thread");
3470 JavaThread *jt = (JavaThread *) thread;
3471 ThreadBlockInVM tbivm(jt);
3472
3473 jt->set_suspend_equivalent();
3474 // cleared by handle_special_suspend_equivalent_condition() or
3475 // java_suspend_self() via check_and_wait_while_suspended()
3476
3477 HANDLE events[1];
3478 events[0] = osthread->interrupt_event();
3479 HighResolutionInterval *phri=NULL;
3480 if (!ForceTimeHighResolution) {
3481 phri = new HighResolutionInterval(ms);
3482 }
3483 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3484 result = OS_TIMEOUT;
3485 } else {
3486 ResetEvent(osthread->interrupt_event());
3487 osthread->set_interrupted(false);
3488 result = OS_INTRPT;
3489 }
3490 delete phri; //if it is NULL, harmless
3491
3492 // were we externally suspended while we were waiting?
3493 jt->check_and_wait_while_suspended();
3494 } else {
3495 assert(!thread->is_Java_thread(), "must not be java thread");
3496 Sleep((long) ms);
3497 result = OS_TIMEOUT;
3498 }
3499 return result;
3500 }
3501
3502 // Short sleep, direct OS call.
3503 //
3504 // ms = 0, means allow others (if any) to run.
3505 //
3506 void os::naked_short_sleep(jlong ms) {
3507 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3508 Sleep(ms);
3509 }
3510
3511 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3512 void os::infinite_sleep() {
3513 while (true) { // sleep forever ...
3514 Sleep(100000); // ... 100 seconds at a time
3515 }
3516 }
3517
3518 typedef BOOL (WINAPI * STTSignature)(void);
3519
3520 void os::naked_yield() {
3521 // Use either SwitchToThread() or Sleep(0)
3522 // Consider passing back the return value from SwitchToThread().
3523 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3524 SwitchToThread();
3525 } else {
3526 Sleep(0);
3527 }
3528 }
3529
3530 // Win32 only gives you access to seven real priorities at a time,
3531 // so we compress Java's ten down to seven. It would be better
3532 // if we dynamically adjusted relative priorities.
3533
3534 int os::java_to_os_priority[CriticalPriority + 1] = {
3535 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3536 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3537 THREAD_PRIORITY_LOWEST, // 2
3538 THREAD_PRIORITY_BELOW_NORMAL, // 3
3539 THREAD_PRIORITY_BELOW_NORMAL, // 4
3540 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3541 THREAD_PRIORITY_NORMAL, // 6
3542 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3543 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3544 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3545 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3546 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3547 };
3548
3549 int prio_policy1[CriticalPriority + 1] = {
3550 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3551 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3552 THREAD_PRIORITY_LOWEST, // 2
3553 THREAD_PRIORITY_BELOW_NORMAL, // 3
3554 THREAD_PRIORITY_BELOW_NORMAL, // 4
3555 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3556 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3557 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3558 THREAD_PRIORITY_HIGHEST, // 8
3559 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3560 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3561 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3562 };
3563
3564 static int prio_init() {
3565 // If ThreadPriorityPolicy is 1, switch tables
3566 if (ThreadPriorityPolicy == 1) {
3567 int i;
3568 for (i = 0; i < CriticalPriority + 1; i++) {
3569 os::java_to_os_priority[i] = prio_policy1[i];
3570 }
3571 }
3572 if (UseCriticalJavaThreadPriority) {
3573 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3574 }
3575 return 0;
3576 }
3577
3578 OSReturn os::set_native_priority(Thread* thread, int priority) {
3579 if (!UseThreadPriorities) return OS_OK;
3580 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3581 return ret ? OS_OK : OS_ERR;
3582 }
3583
3584 OSReturn os::get_native_priority(const Thread* const thread,
3585 int* priority_ptr) {
3586 if (!UseThreadPriorities) {
3587 *priority_ptr = java_to_os_priority[NormPriority];
3588 return OS_OK;
3589 }
3590 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3591 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3592 assert(false, "GetThreadPriority failed");
3593 return OS_ERR;
3594 }
3595 *priority_ptr = os_prio;
3596 return OS_OK;
3597 }
3598
3599
3600 // Hint to the underlying OS that a task switch would not be good.
3601 // Void return because it's a hint and can fail.
3602 void os::hint_no_preempt() {}
3603
3604 void os::interrupt(Thread* thread) {
3605 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3606 Threads_lock->owned_by_self(),
3607 "possibility of dangling Thread pointer");
3608
3609 OSThread* osthread = thread->osthread();
3610 osthread->set_interrupted(true);
3611 // More than one thread can get here with the same value of osthread,
3612 // resulting in multiple notifications. We do, however, want the store
3613 // to interrupted() to be visible to other threads before we post
3614 // the interrupt event.
3615 OrderAccess::release();
3616 SetEvent(osthread->interrupt_event());
3617 // For JSR166: unpark after setting status
3618 if (thread->is_Java_thread()) {
3619 ((JavaThread*)thread)->parker()->unpark();
3620 }
3621
3622 ParkEvent * ev = thread->_ParkEvent;
3623 if (ev != NULL) ev->unpark();
3624 }
3625
3626
3627 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3628 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3629 "possibility of dangling Thread pointer");
3630
3631 OSThread* osthread = thread->osthread();
3632 // There is no synchronization between the setting of the interrupt
3633 // and it being cleared here. It is critical - see 6535709 - that
3634 // we only clear the interrupt state, and reset the interrupt event,
3635 // if we are going to report that we were indeed interrupted - else
3636 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3637 // depending on the timing. By checking thread interrupt event to see
3638 // if the thread gets real interrupt thus prevent spurious wakeup.
3639 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3640 if (interrupted && clear_interrupted) {
3641 osthread->set_interrupted(false);
3642 ResetEvent(osthread->interrupt_event());
3643 } // Otherwise leave the interrupted state alone
3644
3645 return interrupted;
3646 }
3647
3648 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3649 ExtendedPC os::get_thread_pc(Thread* thread) {
3650 CONTEXT context;
3651 context.ContextFlags = CONTEXT_CONTROL;
3652 HANDLE handle = thread->osthread()->thread_handle();
3653 #ifdef _M_IA64
3654 assert(0, "Fix get_thread_pc");
3655 return ExtendedPC(NULL);
3656 #else
3657 if (GetThreadContext(handle, &context)) {
3658 #ifdef _M_AMD64
3659 return ExtendedPC((address) context.Rip);
3660 #else
3661 return ExtendedPC((address) context.Eip);
3662 #endif
3663 } else {
3664 return ExtendedPC(NULL);
3665 }
3666 #endif
3667 }
3668
3669 // GetCurrentThreadId() returns DWORD
3670 intx os::current_thread_id() { return GetCurrentThreadId(); }
3671
3672 static int _initial_pid = 0;
3673
3674 int os::current_process_id() {
3675 return (_initial_pid ? _initial_pid : _getpid());
3676 }
3677
3678 int os::win32::_vm_page_size = 0;
3679 int os::win32::_vm_allocation_granularity = 0;
3680 int os::win32::_processor_type = 0;
3681 // Processor level is not available on non-NT systems, use vm_version instead
3682 int os::win32::_processor_level = 0;
3683 julong os::win32::_physical_memory = 0;
3684 size_t os::win32::_default_stack_size = 0;
3685
3686 intx os::win32::_os_thread_limit = 0;
3687 volatile intx os::win32::_os_thread_count = 0;
3688
3689 bool os::win32::_is_nt = false;
3690 bool os::win32::_is_windows_2003 = false;
3691 bool os::win32::_is_windows_server = false;
3692
3693 // 6573254
3694 // Currently, the bug is observed across all the supported Windows releases,
3695 // including the latest one (as of this writing - Windows Server 2012 R2)
3696 bool os::win32::_has_exit_bug = true;
3697 bool os::win32::_has_performance_count = 0;
3698
3699 void os::win32::initialize_system_info() {
3700 SYSTEM_INFO si;
3701 GetSystemInfo(&si);
3702 _vm_page_size = si.dwPageSize;
3703 _vm_allocation_granularity = si.dwAllocationGranularity;
3704 _processor_type = si.dwProcessorType;
3705 _processor_level = si.wProcessorLevel;
3706 set_processor_count(si.dwNumberOfProcessors);
3707
3708 MEMORYSTATUSEX ms;
3709 ms.dwLength = sizeof(ms);
3710
3711 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3712 // dwMemoryLoad (% of memory in use)
3713 GlobalMemoryStatusEx(&ms);
3714 _physical_memory = ms.ullTotalPhys;
3715
3716 OSVERSIONINFOEX oi;
3717 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3718 GetVersionEx((OSVERSIONINFO*)&oi);
3719 switch (oi.dwPlatformId) {
3720 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3721 case VER_PLATFORM_WIN32_NT:
3722 _is_nt = true;
3723 {
3724 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3725 if (os_vers == 5002) {
3726 _is_windows_2003 = true;
3727 }
3728 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3729 oi.wProductType == VER_NT_SERVER) {
3730 _is_windows_server = true;
3731 }
3732 }
3733 break;
3734 default: fatal("Unknown platform");
3735 }
3736
3737 _default_stack_size = os::current_stack_size();
3738 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3739 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3740 "stack size not a multiple of page size");
3741
3742 initialize_performance_counter();
3743 }
3744
3745
3746 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3747 int ebuflen) {
3748 char path[MAX_PATH];
3749 DWORD size;
3750 DWORD pathLen = (DWORD)sizeof(path);
3751 HINSTANCE result = NULL;
3752
3753 // only allow library name without path component
3754 assert(strchr(name, '\\') == NULL, "path not allowed");
3755 assert(strchr(name, ':') == NULL, "path not allowed");
3756 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3757 jio_snprintf(ebuf, ebuflen,
3758 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3759 return NULL;
3760 }
3761
3762 // search system directory
3763 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3764 if (size >= pathLen) {
3765 return NULL; // truncated
3766 }
3767 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3768 return NULL; // truncated
3769 }
3770 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3771 return result;
3772 }
3773 }
3774
3775 // try Windows directory
3776 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3777 if (size >= pathLen) {
3778 return NULL; // truncated
3779 }
3780 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3781 return NULL; // truncated
3782 }
3783 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3784 return result;
3785 }
3786 }
3787
3788 jio_snprintf(ebuf, ebuflen,
3789 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3790 return NULL;
3791 }
3792
3793 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3794
3795 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3796 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3797 return TRUE;
3798 }
3799
3800 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3801 // Basic approach:
3802 // - Each exiting thread registers its intent to exit and then does so.
3803 // - A thread trying to terminate the process must wait for all
3804 // threads currently exiting to complete their exit.
3805
3806 if (os::win32::has_exit_bug()) {
3807 // The array holds handles of the threads that have started exiting by calling
3808 // _endthreadex().
3809 // Should be large enough to avoid blocking the exiting thread due to lack of
3810 // a free slot.
3811 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3812 static int handle_count = 0;
3813
3814 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3815 static CRITICAL_SECTION crit_sect;
3816 static volatile jint process_exiting = 0;
3817 int i, j;
3818 DWORD res;
3819 HANDLE hproc, hthr;
3820
3821 // The first thread that reached this point, initializes the critical section.
3822 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3823 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3824 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3825 EnterCriticalSection(&crit_sect);
3826
3827 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3828 // Remove from the array those handles of the threads that have completed exiting.
3829 for (i = 0, j = 0; i < handle_count; ++i) {
3830 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3831 if (res == WAIT_TIMEOUT) {
3832 handles[j++] = handles[i];
3833 } else {
3834 if (res == WAIT_FAILED) {
3835 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3836 GetLastError(), __FILE__, __LINE__);
3837 }
3838 // Don't keep the handle, if we failed waiting for it.
3839 CloseHandle(handles[i]);
3840 }
3841 }
3842
3843 // If there's no free slot in the array of the kept handles, we'll have to
3844 // wait until at least one thread completes exiting.
3845 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3846 // Raise the priority of the oldest exiting thread to increase its chances
3847 // to complete sooner.
3848 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3849 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3850 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3851 i = (res - WAIT_OBJECT_0);
3852 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3853 for (; i < handle_count; ++i) {
3854 handles[i] = handles[i + 1];
3855 }
3856 } else {
3857 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3858 (res == WAIT_FAILED ? "failed" : "timed out"),
3859 GetLastError(), __FILE__, __LINE__);
3860 // Don't keep handles, if we failed waiting for them.
3861 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3862 CloseHandle(handles[i]);
3863 }
3864 handle_count = 0;
3865 }
3866 }
3867
3868 // Store a duplicate of the current thread handle in the array of handles.
3869 hproc = GetCurrentProcess();
3870 hthr = GetCurrentThread();
3871 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3872 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3873 warning("DuplicateHandle failed (%u) in %s: %d\n",
3874 GetLastError(), __FILE__, __LINE__);
3875 } else {
3876 ++handle_count;
3877 }
3878
3879 // The current exiting thread has stored its handle in the array, and now
3880 // should leave the critical section before calling _endthreadex().
3881
3882 } else if (what != EPT_THREAD) {
3883 if (handle_count > 0) {
3884 // Before ending the process, make sure all the threads that had called
3885 // _endthreadex() completed.
3886
3887 // Set the priority level of the current thread to the same value as
3888 // the priority level of exiting threads.
3889 // This is to ensure it will be given a fair chance to execute if
3890 // the timeout expires.
3891 hthr = GetCurrentThread();
3892 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3893 for (i = 0; i < handle_count; ++i) {
3894 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3895 }
3896 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3897 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3898 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3899 (res == WAIT_FAILED ? "failed" : "timed out"),
3900 GetLastError(), __FILE__, __LINE__);
3901 }
3902 for (i = 0; i < handle_count; ++i) {
3903 CloseHandle(handles[i]);
3904 }
3905 handle_count = 0;
3906 }
3907
3908 OrderAccess::release_store(&process_exiting, 1);
3909 }
3910
3911 LeaveCriticalSection(&crit_sect);
3912 }
3913
3914 if (what == EPT_THREAD) {
3915 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3916 // Some other thread is about to call exit(), so we
3917 // don't let the current thread proceed to _endthreadex()
3918 SuspendThread(GetCurrentThread());
3919 // Avoid busy-wait loop, if SuspendThread() failed.
3920 Sleep(EXIT_TIMEOUT);
3921 }
3922 }
3923 }
3924
3925 // We are here if either
3926 // - there's no 'race at exit' bug on this OS release;
3927 // - initialization of the critical section failed (unlikely);
3928 // - the current thread has stored its handle and left the critical section;
3929 // - the process-exiting thread has raised the flag and left the critical section.
3930 if (what == EPT_THREAD) {
3931 _endthreadex((unsigned)exit_code);
3932 } else if (what == EPT_PROCESS) {
3933 ::exit(exit_code);
3934 } else {
3935 _exit(exit_code);
3936 }
3937
3938 // Should not reach here
3939 return exit_code;
3940 }
3941
3942 #undef EXIT_TIMEOUT
3943
3944 void os::win32::setmode_streams() {
3945 _setmode(_fileno(stdin), _O_BINARY);
3946 _setmode(_fileno(stdout), _O_BINARY);
3947 _setmode(_fileno(stderr), _O_BINARY);
3948 }
3949
3950
3951 bool os::is_debugger_attached() {
3952 return IsDebuggerPresent() ? true : false;
3953 }
3954
3955
3956 void os::wait_for_keypress_at_exit(void) {
3957 if (PauseAtExit) {
3958 fprintf(stderr, "Press any key to continue...\n");
3959 fgetc(stdin);
3960 }
3961 }
3962
3963
3964 int os::message_box(const char* title, const char* message) {
3965 int result = MessageBox(NULL, message, title,
3966 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3967 return result == IDYES;
3968 }
3969
3970 int os::allocate_thread_local_storage() {
3971 return TlsAlloc();
3972 }
3973
3974
3975 void os::free_thread_local_storage(int index) {
3976 TlsFree(index);
3977 }
3978
3979
3980 void os::thread_local_storage_at_put(int index, void* value) {
3981 TlsSetValue(index, value);
3982 assert(thread_local_storage_at(index) == value, "Just checking");
3983 }
3984
3985
3986 void* os::thread_local_storage_at(int index) {
3987 return TlsGetValue(index);
3988 }
3989
3990
3991 #ifndef PRODUCT
3992 #ifndef _WIN64
3993 // Helpers to check whether NX protection is enabled
3994 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3995 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3996 pex->ExceptionRecord->NumberParameters > 0 &&
3997 pex->ExceptionRecord->ExceptionInformation[0] ==
3998 EXCEPTION_INFO_EXEC_VIOLATION) {
3999 return EXCEPTION_EXECUTE_HANDLER;
4000 }
4001 return EXCEPTION_CONTINUE_SEARCH;
4002 }
4003
4004 void nx_check_protection() {
4005 // If NX is enabled we'll get an exception calling into code on the stack
4006 char code[] = { (char)0xC3 }; // ret
4007 void *code_ptr = (void *)code;
4008 __try {
4009 __asm call code_ptr
4010 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4011 tty->print_raw_cr("NX protection detected.");
4012 }
4013 }
4014 #endif // _WIN64
4015 #endif // PRODUCT
4016
4017 // this is called _before_ the global arguments have been parsed
4018 void os::init(void) {
4019 _initial_pid = _getpid();
4020
4021 init_random(1234567);
4022
4023 win32::initialize_system_info();
4024 win32::setmode_streams();
4025 init_page_sizes((size_t) win32::vm_page_size());
4026
4027 // This may be overridden later when argument processing is done.
4028 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4029 os::win32::is_windows_2003());
4030
4031 // Initialize main_process and main_thread
4032 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4033 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4034 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4035 fatal("DuplicateHandle failed\n");
4036 }
4037 main_thread_id = (int) GetCurrentThreadId();
4038 }
4039
4040 // To install functions for atexit processing
4041 extern "C" {
4042 static void perfMemory_exit_helper() {
4043 perfMemory_exit();
4044 }
4045 }
4046
4047 static jint initSock();
4048
4049 // this is called _after_ the global arguments have been parsed
4050 jint os::init_2(void) {
4051 // Allocate a single page and mark it as readable for safepoint polling
4052 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4053 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4054
4055 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4056 guarantee(return_page != NULL, "Commit Failed for polling page");
4057
4058 os::set_polling_page(polling_page);
4059
4060 #ifndef PRODUCT
4061 if (Verbose && PrintMiscellaneous) {
4062 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4063 (intptr_t)polling_page);
4064 }
4065 #endif
4066
4067 if (!UseMembar) {
4068 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4069 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4070
4071 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4072 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4073
4074 os::set_memory_serialize_page(mem_serialize_page);
4075
4076 #ifndef PRODUCT
4077 if (Verbose && PrintMiscellaneous) {
4078 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4079 (intptr_t)mem_serialize_page);
4080 }
4081 #endif
4082 }
4083
4084 // Setup Windows Exceptions
4085
4086 // for debugging float code generation bugs
4087 if (ForceFloatExceptions) {
4088 #ifndef _WIN64
4089 static long fp_control_word = 0;
4090 __asm { fstcw fp_control_word }
4091 // see Intel PPro Manual, Vol. 2, p 7-16
4092 const long precision = 0x20;
4093 const long underflow = 0x10;
4094 const long overflow = 0x08;
4095 const long zero_div = 0x04;
4096 const long denorm = 0x02;
4097 const long invalid = 0x01;
4098 fp_control_word |= invalid;
4099 __asm { fldcw fp_control_word }
4100 #endif
4101 }
4102
4103 // If stack_commit_size is 0, windows will reserve the default size,
4104 // but only commit a small portion of it.
4105 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4106 size_t default_reserve_size = os::win32::default_stack_size();
4107 size_t actual_reserve_size = stack_commit_size;
4108 if (stack_commit_size < default_reserve_size) {
4109 // If stack_commit_size == 0, we want this too
4110 actual_reserve_size = default_reserve_size;
4111 }
4112
4113 // Check minimum allowable stack size for thread creation and to initialize
4114 // the java system classes, including StackOverflowError - depends on page
4115 // size. Add a page for compiler2 recursion in main thread.
4116 // Add in 2*BytesPerWord times page size to account for VM stack during
4117 // class initialization depending on 32 or 64 bit VM.
4118 size_t min_stack_allowed =
4119 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4120 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4121 if (actual_reserve_size < min_stack_allowed) {
4122 tty->print_cr("\nThe stack size specified is too small, "
4123 "Specify at least %dk",
4124 min_stack_allowed / K);
4125 return JNI_ERR;
4126 }
4127
4128 JavaThread::set_stack_size_at_create(stack_commit_size);
4129
4130 // Calculate theoretical max. size of Threads to guard gainst artifical
4131 // out-of-memory situations, where all available address-space has been
4132 // reserved by thread stacks.
4133 assert(actual_reserve_size != 0, "Must have a stack");
4134
4135 // Calculate the thread limit when we should start doing Virtual Memory
4136 // banging. Currently when the threads will have used all but 200Mb of space.
4137 //
4138 // TODO: consider performing a similar calculation for commit size instead
4139 // as reserve size, since on a 64-bit platform we'll run into that more
4140 // often than running out of virtual memory space. We can use the
4141 // lower value of the two calculations as the os_thread_limit.
4142 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4143 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4144
4145 // at exit methods are called in the reverse order of their registration.
4146 // there is no limit to the number of functions registered. atexit does
4147 // not set errno.
4148
4149 if (PerfAllowAtExitRegistration) {
4150 // only register atexit functions if PerfAllowAtExitRegistration is set.
4151 // atexit functions can be delayed until process exit time, which
4152 // can be problematic for embedded VM situations. Embedded VMs should
4153 // call DestroyJavaVM() to assure that VM resources are released.
4154
4155 // note: perfMemory_exit_helper atexit function may be removed in
4156 // the future if the appropriate cleanup code can be added to the
4157 // VM_Exit VMOperation's doit method.
4158 if (atexit(perfMemory_exit_helper) != 0) {
4159 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4160 }
4161 }
4162
4163 #ifndef _WIN64
4164 // Print something if NX is enabled (win32 on AMD64)
4165 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4166 #endif
4167
4168 // initialize thread priority policy
4169 prio_init();
4170
4171 if (UseNUMA && !ForceNUMA) {
4172 UseNUMA = false; // We don't fully support this yet
4173 }
4174
4175 if (UseNUMAInterleaving) {
4176 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4177 bool success = numa_interleaving_init();
4178 if (!success) UseNUMAInterleaving = false;
4179 }
4180
4181 if (initSock() != JNI_OK) {
4182 return JNI_ERR;
4183 }
4184
4185 return JNI_OK;
4186 }
4187
4188 // Mark the polling page as unreadable
4189 void os::make_polling_page_unreadable(void) {
4190 DWORD old_status;
4191 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4192 PAGE_NOACCESS, &old_status)) {
4193 fatal("Could not disable polling page");
4194 }
4195 }
4196
4197 // Mark the polling page as readable
4198 void os::make_polling_page_readable(void) {
4199 DWORD old_status;
4200 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4201 PAGE_READONLY, &old_status)) {
4202 fatal("Could not enable polling page");
4203 }
4204 }
4205
4206
4207 int os::stat(const char *path, struct stat *sbuf) {
4208 char pathbuf[MAX_PATH];
4209 if (strlen(path) > MAX_PATH - 1) {
4210 errno = ENAMETOOLONG;
4211 return -1;
4212 }
4213 os::native_path(strcpy(pathbuf, path));
4214 int ret = ::stat(pathbuf, sbuf);
4215 if (sbuf != NULL && UseUTCFileTimestamp) {
4216 // Fix for 6539723. st_mtime returned from stat() is dependent on
4217 // the system timezone and so can return different values for the
4218 // same file if/when daylight savings time changes. This adjustment
4219 // makes sure the same timestamp is returned regardless of the TZ.
4220 //
4221 // See:
4222 // http://msdn.microsoft.com/library/
4223 // default.asp?url=/library/en-us/sysinfo/base/
4224 // time_zone_information_str.asp
4225 // and
4226 // http://msdn.microsoft.com/library/default.asp?url=
4227 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4228 //
4229 // NOTE: there is a insidious bug here: If the timezone is changed
4230 // after the call to stat() but before 'GetTimeZoneInformation()', then
4231 // the adjustment we do here will be wrong and we'll return the wrong
4232 // value (which will likely end up creating an invalid class data
4233 // archive). Absent a better API for this, or some time zone locking
4234 // mechanism, we'll have to live with this risk.
4235 TIME_ZONE_INFORMATION tz;
4236 DWORD tzid = GetTimeZoneInformation(&tz);
4237 int daylightBias =
4238 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4239 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4240 }
4241 return ret;
4242 }
4243
4244
4245 #define FT2INT64(ft) \
4246 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4247
4248
4249 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4250 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4251 // of a thread.
4252 //
4253 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4254 // the fast estimate available on the platform.
4255
4256 // current_thread_cpu_time() is not optimized for Windows yet
4257 jlong os::current_thread_cpu_time() {
4258 // return user + sys since the cost is the same
4259 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4260 }
4261
4262 jlong os::thread_cpu_time(Thread* thread) {
4263 // consistent with what current_thread_cpu_time() returns.
4264 return os::thread_cpu_time(thread, true /* user+sys */);
4265 }
4266
4267 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4268 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4269 }
4270
4271 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4272 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4273 // If this function changes, os::is_thread_cpu_time_supported() should too
4274 if (os::win32::is_nt()) {
4275 FILETIME CreationTime;
4276 FILETIME ExitTime;
4277 FILETIME KernelTime;
4278 FILETIME UserTime;
4279
4280 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4281 &ExitTime, &KernelTime, &UserTime) == 0) {
4282 return -1;
4283 } else if (user_sys_cpu_time) {
4284 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4285 } else {
4286 return FT2INT64(UserTime) * 100;
4287 }
4288 } else {
4289 return (jlong) timeGetTime() * 1000000;
4290 }
4291 }
4292
4293 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4294 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4295 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4296 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4297 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4298 }
4299
4300 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4301 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4302 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4303 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4304 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4305 }
4306
4307 bool os::is_thread_cpu_time_supported() {
4308 // see os::thread_cpu_time
4309 if (os::win32::is_nt()) {
4310 FILETIME CreationTime;
4311 FILETIME ExitTime;
4312 FILETIME KernelTime;
4313 FILETIME UserTime;
4314
4315 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4316 &KernelTime, &UserTime) == 0) {
4317 return false;
4318 } else {
4319 return true;
4320 }
4321 } else {
4322 return false;
4323 }
4324 }
4325
4326 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4327 // It does have primitives (PDH API) to get CPU usage and run queue length.
4328 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4329 // If we wanted to implement loadavg on Windows, we have a few options:
4330 //
4331 // a) Query CPU usage and run queue length and "fake" an answer by
4332 // returning the CPU usage if it's under 100%, and the run queue
4333 // length otherwise. It turns out that querying is pretty slow
4334 // on Windows, on the order of 200 microseconds on a fast machine.
4335 // Note that on the Windows the CPU usage value is the % usage
4336 // since the last time the API was called (and the first call
4337 // returns 100%), so we'd have to deal with that as well.
4338 //
4339 // b) Sample the "fake" answer using a sampling thread and store
4340 // the answer in a global variable. The call to loadavg would
4341 // just return the value of the global, avoiding the slow query.
4342 //
4343 // c) Sample a better answer using exponential decay to smooth the
4344 // value. This is basically the algorithm used by UNIX kernels.
4345 //
4346 // Note that sampling thread starvation could affect both (b) and (c).
4347 int os::loadavg(double loadavg[], int nelem) {
4348 return -1;
4349 }
4350
4351
4352 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4353 bool os::dont_yield() {
4354 return DontYieldALot;
4355 }
4356
4357 // This method is a slightly reworked copy of JDK's sysOpen
4358 // from src/windows/hpi/src/sys_api_md.c
4359
4360 int os::open(const char *path, int oflag, int mode) {
4361 char pathbuf[MAX_PATH];
4362
4363 if (strlen(path) > MAX_PATH - 1) {
4364 errno = ENAMETOOLONG;
4365 return -1;
4366 }
4367 os::native_path(strcpy(pathbuf, path));
4368 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4369 }
4370
4371 FILE* os::open(int fd, const char* mode) {
4372 return ::_fdopen(fd, mode);
4373 }
4374
4375 // Is a (classpath) directory empty?
4376 bool os::dir_is_empty(const char* path) {
4377 WIN32_FIND_DATA fd;
4378 HANDLE f = FindFirstFile(path, &fd);
4379 if (f == INVALID_HANDLE_VALUE) {
4380 return true;
4381 }
4382 FindClose(f);
4383 return false;
4384 }
4385
4386 // create binary file, rewriting existing file if required
4387 int os::create_binary_file(const char* path, bool rewrite_existing) {
4388 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4389 if (!rewrite_existing) {
4390 oflags |= _O_EXCL;
4391 }
4392 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4393 }
4394
4395 // return current position of file pointer
4396 jlong os::current_file_offset(int fd) {
4397 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4398 }
4399
4400 // move file pointer to the specified offset
4401 jlong os::seek_to_file_offset(int fd, jlong offset) {
4402 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4403 }
4404
4405
4406 jlong os::lseek(int fd, jlong offset, int whence) {
4407 return (jlong) ::_lseeki64(fd, offset, whence);
4408 }
4409
4410 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4411 OVERLAPPED ov;
4412 DWORD nread;
4413 BOOL result;
4414
4415 ZeroMemory(&ov, sizeof(ov));
4416 ov.Offset = (DWORD)offset;
4417 ov.OffsetHigh = (DWORD)(offset >> 32);
4418
4419 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4420
4421 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4422
4423 return result ? nread : 0;
4424 }
4425
4426
4427 // This method is a slightly reworked copy of JDK's sysNativePath
4428 // from src/windows/hpi/src/path_md.c
4429
4430 // Convert a pathname to native format. On win32, this involves forcing all
4431 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4432 // sometimes rejects '/') and removing redundant separators. The input path is
4433 // assumed to have been converted into the character encoding used by the local
4434 // system. Because this might be a double-byte encoding, care is taken to
4435 // treat double-byte lead characters correctly.
4436 //
4437 // This procedure modifies the given path in place, as the result is never
4438 // longer than the original. There is no error return; this operation always
4439 // succeeds.
4440 char * os::native_path(char *path) {
4441 char *src = path, *dst = path, *end = path;
4442 char *colon = NULL; // If a drive specifier is found, this will
4443 // point to the colon following the drive letter
4444
4445 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4446 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4447 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4448
4449 // Check for leading separators
4450 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4451 while (isfilesep(*src)) {
4452 src++;
4453 }
4454
4455 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4456 // Remove leading separators if followed by drive specifier. This
4457 // hack is necessary to support file URLs containing drive
4458 // specifiers (e.g., "file://c:/path"). As a side effect,
4459 // "/c:/path" can be used as an alternative to "c:/path".
4460 *dst++ = *src++;
4461 colon = dst;
4462 *dst++ = ':';
4463 src++;
4464 } else {
4465 src = path;
4466 if (isfilesep(src[0]) && isfilesep(src[1])) {
4467 // UNC pathname: Retain first separator; leave src pointed at
4468 // second separator so that further separators will be collapsed
4469 // into the second separator. The result will be a pathname
4470 // beginning with "\\\\" followed (most likely) by a host name.
4471 src = dst = path + 1;
4472 path[0] = '\\'; // Force first separator to '\\'
4473 }
4474 }
4475
4476 end = dst;
4477
4478 // Remove redundant separators from remainder of path, forcing all
4479 // separators to be '\\' rather than '/'. Also, single byte space
4480 // characters are removed from the end of the path because those
4481 // are not legal ending characters on this operating system.
4482 //
4483 while (*src != '\0') {
4484 if (isfilesep(*src)) {
4485 *dst++ = '\\'; src++;
4486 while (isfilesep(*src)) src++;
4487 if (*src == '\0') {
4488 // Check for trailing separator
4489 end = dst;
4490 if (colon == dst - 2) break; // "z:\\"
4491 if (dst == path + 1) break; // "\\"
4492 if (dst == path + 2 && isfilesep(path[0])) {
4493 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4494 // beginning of a UNC pathname. Even though it is not, by
4495 // itself, a valid UNC pathname, we leave it as is in order
4496 // to be consistent with the path canonicalizer as well
4497 // as the win32 APIs, which treat this case as an invalid
4498 // UNC pathname rather than as an alias for the root
4499 // directory of the current drive.
4500 break;
4501 }
4502 end = --dst; // Path does not denote a root directory, so
4503 // remove trailing separator
4504 break;
4505 }
4506 end = dst;
4507 } else {
4508 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4509 *dst++ = *src++;
4510 if (*src) *dst++ = *src++;
4511 end = dst;
4512 } else { // Copy a single-byte character
4513 char c = *src++;
4514 *dst++ = c;
4515 // Space is not a legal ending character
4516 if (c != ' ') end = dst;
4517 }
4518 }
4519 }
4520
4521 *end = '\0';
4522
4523 // For "z:", add "." to work around a bug in the C runtime library
4524 if (colon == dst - 1) {
4525 path[2] = '.';
4526 path[3] = '\0';
4527 }
4528
4529 return path;
4530 }
4531
4532 // This code is a copy of JDK's sysSetLength
4533 // from src/windows/hpi/src/sys_api_md.c
4534
4535 int os::ftruncate(int fd, jlong length) {
4536 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4537 long high = (long)(length >> 32);
4538 DWORD ret;
4539
4540 if (h == (HANDLE)(-1)) {
4541 return -1;
4542 }
4543
4544 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4545 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4546 return -1;
4547 }
4548
4549 if (::SetEndOfFile(h) == FALSE) {
4550 return -1;
4551 }
4552
4553 return 0;
4554 }
4555
4556
4557 // This code is a copy of JDK's sysSync
4558 // from src/windows/hpi/src/sys_api_md.c
4559 // except for the legacy workaround for a bug in Win 98
4560
4561 int os::fsync(int fd) {
4562 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4563
4564 if ((!::FlushFileBuffers(handle)) &&
4565 (GetLastError() != ERROR_ACCESS_DENIED)) {
4566 // from winerror.h
4567 return -1;
4568 }
4569 return 0;
4570 }
4571
4572 static int nonSeekAvailable(int, long *);
4573 static int stdinAvailable(int, long *);
4574
4575 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4576 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4577
4578 // This code is a copy of JDK's sysAvailable
4579 // from src/windows/hpi/src/sys_api_md.c
4580
4581 int os::available(int fd, jlong *bytes) {
4582 jlong cur, end;
4583 struct _stati64 stbuf64;
4584
4585 if (::_fstati64(fd, &stbuf64) >= 0) {
4586 int mode = stbuf64.st_mode;
4587 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4588 int ret;
4589 long lpbytes;
4590 if (fd == 0) {
4591 ret = stdinAvailable(fd, &lpbytes);
4592 } else {
4593 ret = nonSeekAvailable(fd, &lpbytes);
4594 }
4595 (*bytes) = (jlong)(lpbytes);
4596 return ret;
4597 }
4598 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4599 return FALSE;
4600 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4601 return FALSE;
4602 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4603 return FALSE;
4604 }
4605 *bytes = end - cur;
4606 return TRUE;
4607 } else {
4608 return FALSE;
4609 }
4610 }
4611
4612 // This code is a copy of JDK's nonSeekAvailable
4613 // from src/windows/hpi/src/sys_api_md.c
4614
4615 static int nonSeekAvailable(int fd, long *pbytes) {
4616 // This is used for available on non-seekable devices
4617 // (like both named and anonymous pipes, such as pipes
4618 // connected to an exec'd process).
4619 // Standard Input is a special case.
4620 HANDLE han;
4621
4622 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4623 return FALSE;
4624 }
4625
4626 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4627 // PeekNamedPipe fails when at EOF. In that case we
4628 // simply make *pbytes = 0 which is consistent with the
4629 // behavior we get on Solaris when an fd is at EOF.
4630 // The only alternative is to raise an Exception,
4631 // which isn't really warranted.
4632 //
4633 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4634 return FALSE;
4635 }
4636 *pbytes = 0;
4637 }
4638 return TRUE;
4639 }
4640
4641 #define MAX_INPUT_EVENTS 2000
4642
4643 // This code is a copy of JDK's stdinAvailable
4644 // from src/windows/hpi/src/sys_api_md.c
4645
4646 static int stdinAvailable(int fd, long *pbytes) {
4647 HANDLE han;
4648 DWORD numEventsRead = 0; // Number of events read from buffer
4649 DWORD numEvents = 0; // Number of events in buffer
4650 DWORD i = 0; // Loop index
4651 DWORD curLength = 0; // Position marker
4652 DWORD actualLength = 0; // Number of bytes readable
4653 BOOL error = FALSE; // Error holder
4654 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4655
4656 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4657 return FALSE;
4658 }
4659
4660 // Construct an array of input records in the console buffer
4661 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4662 if (error == 0) {
4663 return nonSeekAvailable(fd, pbytes);
4664 }
4665
4666 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4667 if (numEvents > MAX_INPUT_EVENTS) {
4668 numEvents = MAX_INPUT_EVENTS;
4669 }
4670
4671 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4672 if (lpBuffer == NULL) {
4673 return FALSE;
4674 }
4675
4676 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4677 if (error == 0) {
4678 os::free(lpBuffer);
4679 return FALSE;
4680 }
4681
4682 // Examine input records for the number of bytes available
4683 for (i=0; i<numEvents; i++) {
4684 if (lpBuffer[i].EventType == KEY_EVENT) {
4685
4686 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4687 &(lpBuffer[i].Event);
4688 if (keyRecord->bKeyDown == TRUE) {
4689 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4690 curLength++;
4691 if (*keyPressed == '\r') {
4692 actualLength = curLength;
4693 }
4694 }
4695 }
4696 }
4697
4698 if (lpBuffer != NULL) {
4699 os::free(lpBuffer);
4700 }
4701
4702 *pbytes = (long) actualLength;
4703 return TRUE;
4704 }
4705
4706 // Map a block of memory.
4707 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4708 char *addr, size_t bytes, bool read_only,
4709 bool allow_exec) {
4710 HANDLE hFile;
4711 char* base;
4712
4713 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4714 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4715 if (hFile == NULL) {
4716 if (PrintMiscellaneous && Verbose) {
4717 DWORD err = GetLastError();
4718 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4719 }
4720 return NULL;
4721 }
4722
4723 if (allow_exec) {
4724 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4725 // unless it comes from a PE image (which the shared archive is not.)
4726 // Even VirtualProtect refuses to give execute access to mapped memory
4727 // that was not previously executable.
4728 //
4729 // Instead, stick the executable region in anonymous memory. Yuck.
4730 // Penalty is that ~4 pages will not be shareable - in the future
4731 // we might consider DLLizing the shared archive with a proper PE
4732 // header so that mapping executable + sharing is possible.
4733
4734 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4735 PAGE_READWRITE);
4736 if (base == NULL) {
4737 if (PrintMiscellaneous && Verbose) {
4738 DWORD err = GetLastError();
4739 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4740 }
4741 CloseHandle(hFile);
4742 return NULL;
4743 }
4744
4745 DWORD bytes_read;
4746 OVERLAPPED overlapped;
4747 overlapped.Offset = (DWORD)file_offset;
4748 overlapped.OffsetHigh = 0;
4749 overlapped.hEvent = NULL;
4750 // ReadFile guarantees that if the return value is true, the requested
4751 // number of bytes were read before returning.
4752 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4753 if (!res) {
4754 if (PrintMiscellaneous && Verbose) {
4755 DWORD err = GetLastError();
4756 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4757 }
4758 release_memory(base, bytes);
4759 CloseHandle(hFile);
4760 return NULL;
4761 }
4762 } else {
4763 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4764 NULL /* file_name */);
4765 if (hMap == NULL) {
4766 if (PrintMiscellaneous && Verbose) {
4767 DWORD err = GetLastError();
4768 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4769 }
4770 CloseHandle(hFile);
4771 return NULL;
4772 }
4773
4774 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4775 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4776 (DWORD)bytes, addr);
4777 if (base == NULL) {
4778 if (PrintMiscellaneous && Verbose) {
4779 DWORD err = GetLastError();
4780 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4781 }
4782 CloseHandle(hMap);
4783 CloseHandle(hFile);
4784 return NULL;
4785 }
4786
4787 if (CloseHandle(hMap) == 0) {
4788 if (PrintMiscellaneous && Verbose) {
4789 DWORD err = GetLastError();
4790 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4791 }
4792 CloseHandle(hFile);
4793 return base;
4794 }
4795 }
4796
4797 if (allow_exec) {
4798 DWORD old_protect;
4799 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4800 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4801
4802 if (!res) {
4803 if (PrintMiscellaneous && Verbose) {
4804 DWORD err = GetLastError();
4805 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4806 }
4807 // Don't consider this a hard error, on IA32 even if the
4808 // VirtualProtect fails, we should still be able to execute
4809 CloseHandle(hFile);
4810 return base;
4811 }
4812 }
4813
4814 if (CloseHandle(hFile) == 0) {
4815 if (PrintMiscellaneous && Verbose) {
4816 DWORD err = GetLastError();
4817 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4818 }
4819 return base;
4820 }
4821
4822 return base;
4823 }
4824
4825
4826 // Remap a block of memory.
4827 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4828 char *addr, size_t bytes, bool read_only,
4829 bool allow_exec) {
4830 // This OS does not allow existing memory maps to be remapped so we
4831 // have to unmap the memory before we remap it.
4832 if (!os::unmap_memory(addr, bytes)) {
4833 return NULL;
4834 }
4835
4836 // There is a very small theoretical window between the unmap_memory()
4837 // call above and the map_memory() call below where a thread in native
4838 // code may be able to access an address that is no longer mapped.
4839
4840 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4841 read_only, allow_exec);
4842 }
4843
4844
4845 // Unmap a block of memory.
4846 // Returns true=success, otherwise false.
4847
4848 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4849 BOOL result = UnmapViewOfFile(addr);
4850 if (result == 0) {
4851 if (PrintMiscellaneous && Verbose) {
4852 DWORD err = GetLastError();
4853 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4854 }
4855 return false;
4856 }
4857 return true;
4858 }
4859
4860 void os::pause() {
4861 char filename[MAX_PATH];
4862 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4863 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4864 } else {
4865 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4866 }
4867
4868 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4869 if (fd != -1) {
4870 struct stat buf;
4871 ::close(fd);
4872 while (::stat(filename, &buf) == 0) {
4873 Sleep(100);
4874 }
4875 } else {
4876 jio_fprintf(stderr,
4877 "Could not open pause file '%s', continuing immediately.\n", filename);
4878 }
4879 }
4880
4881 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4882 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4883 }
4884
4885 // See the caveats for this class in os_windows.hpp
4886 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4887 // into this method and returns false. If no OS EXCEPTION was raised, returns
4888 // true.
4889 // The callback is supposed to provide the method that should be protected.
4890 //
4891 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4892 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4893 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4894 "crash_protection already set?");
4895
4896 bool success = true;
4897 __try {
4898 WatcherThread::watcher_thread()->set_crash_protection(this);
4899 cb.call();
4900 } __except(EXCEPTION_EXECUTE_HANDLER) {
4901 // only for protection, nothing to do
4902 success = false;
4903 }
4904 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4905 return success;
4906 }
4907
4908 // An Event wraps a win32 "CreateEvent" kernel handle.
4909 //
4910 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4911 //
4912 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4913 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4914 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4915 // In addition, an unpark() operation might fetch the handle field, but the
4916 // event could recycle between the fetch and the SetEvent() operation.
4917 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4918 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4919 // on an stale but recycled handle would be harmless, but in practice this might
4920 // confuse other non-Sun code, so it's not a viable approach.
4921 //
4922 // 2: Once a win32 event handle is associated with an Event, it remains associated
4923 // with the Event. The event handle is never closed. This could be construed
4924 // as handle leakage, but only up to the maximum # of threads that have been extant
4925 // at any one time. This shouldn't be an issue, as windows platforms typically
4926 // permit a process to have hundreds of thousands of open handles.
4927 //
4928 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4929 // and release unused handles.
4930 //
4931 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4932 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4933 //
4934 // 5. Use an RCU-like mechanism (Read-Copy Update).
4935 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4936 //
4937 // We use (2).
4938 //
4939 // TODO-FIXME:
4940 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4941 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4942 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4943 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4944 // into a single win32 CreateEvent() handle.
4945 //
4946 // Assumption:
4947 // Only one parker can exist on an event, which is why we allocate
4948 // them per-thread. Multiple unparkers can coexist.
4949 //
4950 // _Event transitions in park()
4951 // -1 => -1 : illegal
4952 // 1 => 0 : pass - return immediately
4953 // 0 => -1 : block; then set _Event to 0 before returning
4954 //
4955 // _Event transitions in unpark()
4956 // 0 => 1 : just return
4957 // 1 => 1 : just return
4958 // -1 => either 0 or 1; must signal target thread
4959 // That is, we can safely transition _Event from -1 to either
4960 // 0 or 1.
4961 //
4962 // _Event serves as a restricted-range semaphore.
4963 // -1 : thread is blocked, i.e. there is a waiter
4964 // 0 : neutral: thread is running or ready,
4965 // could have been signaled after a wait started
4966 // 1 : signaled - thread is running or ready
4967 //
4968 // Another possible encoding of _Event would be with
4969 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4970 //
4971
4972 int os::PlatformEvent::park(jlong Millis) {
4973 // Transitions for _Event:
4974 // -1 => -1 : illegal
4975 // 1 => 0 : pass - return immediately
4976 // 0 => -1 : block; then set _Event to 0 before returning
4977
4978 guarantee(_ParkHandle != NULL , "Invariant");
4979 guarantee(Millis > 0 , "Invariant");
4980
4981 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4982 // the initial park() operation.
4983 // Consider: use atomic decrement instead of CAS-loop
4984
4985 int v;
4986 for (;;) {
4987 v = _Event;
4988 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4989 }
4990 guarantee((v == 0) || (v == 1), "invariant");
4991 if (v != 0) return OS_OK;
4992
4993 // Do this the hard way by blocking ...
4994 // TODO: consider a brief spin here, gated on the success of recent
4995 // spin attempts by this thread.
4996 //
4997 // We decompose long timeouts into series of shorter timed waits.
4998 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4999 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5000 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5001 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5002 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5003 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5004 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5005 // for the already waited time. This policy does not admit any new outcomes.
5006 // In the future, however, we might want to track the accumulated wait time and
5007 // adjust Millis accordingly if we encounter a spurious wakeup.
5008
5009 const int MAXTIMEOUT = 0x10000000;
5010 DWORD rv = WAIT_TIMEOUT;
5011 while (_Event < 0 && Millis > 0) {
5012 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5013 if (Millis > MAXTIMEOUT) {
5014 prd = MAXTIMEOUT;
5015 }
5016 rv = ::WaitForSingleObject(_ParkHandle, prd);
5017 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5018 if (rv == WAIT_TIMEOUT) {
5019 Millis -= prd;
5020 }
5021 }
5022 v = _Event;
5023 _Event = 0;
5024 // see comment at end of os::PlatformEvent::park() below:
5025 OrderAccess::fence();
5026 // If we encounter a nearly simultanous timeout expiry and unpark()
5027 // we return OS_OK indicating we awoke via unpark().
5028 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5029 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5030 }
5031
5032 void os::PlatformEvent::park() {
5033 // Transitions for _Event:
5034 // -1 => -1 : illegal
5035 // 1 => 0 : pass - return immediately
5036 // 0 => -1 : block; then set _Event to 0 before returning
5037
5038 guarantee(_ParkHandle != NULL, "Invariant");
5039 // Invariant: Only the thread associated with the Event/PlatformEvent
5040 // may call park().
5041 // Consider: use atomic decrement instead of CAS-loop
5042 int v;
5043 for (;;) {
5044 v = _Event;
5045 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5046 }
5047 guarantee((v == 0) || (v == 1), "invariant");
5048 if (v != 0) return;
5049
5050 // Do this the hard way by blocking ...
5051 // TODO: consider a brief spin here, gated on the success of recent
5052 // spin attempts by this thread.
5053 while (_Event < 0) {
5054 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5055 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5056 }
5057
5058 // Usually we'll find _Event == 0 at this point, but as
5059 // an optional optimization we clear it, just in case can
5060 // multiple unpark() operations drove _Event up to 1.
5061 _Event = 0;
5062 OrderAccess::fence();
5063 guarantee(_Event >= 0, "invariant");
5064 }
5065
5066 void os::PlatformEvent::unpark() {
5067 guarantee(_ParkHandle != NULL, "Invariant");
5068
5069 // Transitions for _Event:
5070 // 0 => 1 : just return
5071 // 1 => 1 : just return
5072 // -1 => either 0 or 1; must signal target thread
5073 // That is, we can safely transition _Event from -1 to either
5074 // 0 or 1.
5075 // See also: "Semaphores in Plan 9" by Mullender & Cox
5076 //
5077 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5078 // that it will take two back-to-back park() calls for the owning
5079 // thread to block. This has the benefit of forcing a spurious return
5080 // from the first park() call after an unpark() call which will help
5081 // shake out uses of park() and unpark() without condition variables.
5082
5083 if (Atomic::xchg(1, &_Event) >= 0) return;
5084
5085 ::SetEvent(_ParkHandle);
5086 }
5087
5088
5089 // JSR166
5090 // -------------------------------------------------------
5091
5092 // The Windows implementation of Park is very straightforward: Basic
5093 // operations on Win32 Events turn out to have the right semantics to
5094 // use them directly. We opportunistically resuse the event inherited
5095 // from Monitor.
5096
5097 void Parker::park(bool isAbsolute, jlong time) {
5098 guarantee(_ParkEvent != NULL, "invariant");
5099 // First, demultiplex/decode time arguments
5100 if (time < 0) { // don't wait
5101 return;
5102 } else if (time == 0 && !isAbsolute) {
5103 time = INFINITE;
5104 } else if (isAbsolute) {
5105 time -= os::javaTimeMillis(); // convert to relative time
5106 if (time <= 0) { // already elapsed
5107 return;
5108 }
5109 } else { // relative
5110 time /= 1000000; // Must coarsen from nanos to millis
5111 if (time == 0) { // Wait for the minimal time unit if zero
5112 time = 1;
5113 }
5114 }
5115
5116 JavaThread* thread = (JavaThread*)(Thread::current());
5117 assert(thread->is_Java_thread(), "Must be JavaThread");
5118 JavaThread *jt = (JavaThread *)thread;
5119
5120 // Don't wait if interrupted or already triggered
5121 if (Thread::is_interrupted(thread, false) ||
5122 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5123 ResetEvent(_ParkEvent);
5124 return;
5125 } else {
5126 ThreadBlockInVM tbivm(jt);
5127 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5128 jt->set_suspend_equivalent();
5129
5130 WaitForSingleObject(_ParkEvent, time);
5131 ResetEvent(_ParkEvent);
5132
5133 // If externally suspended while waiting, re-suspend
5134 if (jt->handle_special_suspend_equivalent_condition()) {
5135 jt->java_suspend_self();
5136 }
5137 }
5138 }
5139
5140 void Parker::unpark() {
5141 guarantee(_ParkEvent != NULL, "invariant");
5142 SetEvent(_ParkEvent);
5143 }
5144
5145 // Run the specified command in a separate process. Return its exit value,
5146 // or -1 on failure (e.g. can't create a new process).
5147 int os::fork_and_exec(char* cmd) {
5148 STARTUPINFO si;
5149 PROCESS_INFORMATION pi;
5150
5151 memset(&si, 0, sizeof(si));
5152 si.cb = sizeof(si);
5153 memset(&pi, 0, sizeof(pi));
5154 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5155 cmd, // command line
5156 NULL, // process security attribute
5157 NULL, // thread security attribute
5158 TRUE, // inherits system handles
5159 0, // no creation flags
5160 NULL, // use parent's environment block
5161 NULL, // use parent's starting directory
5162 &si, // (in) startup information
5163 &pi); // (out) process information
5164
5165 if (rslt) {
5166 // Wait until child process exits.
5167 WaitForSingleObject(pi.hProcess, INFINITE);
5168
5169 DWORD exit_code;
5170 GetExitCodeProcess(pi.hProcess, &exit_code);
5171
5172 // Close process and thread handles.
5173 CloseHandle(pi.hProcess);
5174 CloseHandle(pi.hThread);
5175
5176 return (int)exit_code;
5177 } else {
5178 return -1;
5179 }
5180 }
5181
5182 //--------------------------------------------------------------------------------------------------
5183 // Non-product code
5184
5185 static int mallocDebugIntervalCounter = 0;
5186 static int mallocDebugCounter = 0;
5187 bool os::check_heap(bool force) {
5188 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5189 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5190 // Note: HeapValidate executes two hardware breakpoints when it finds something
5191 // wrong; at these points, eax contains the address of the offending block (I think).
5192 // To get to the exlicit error message(s) below, just continue twice.
5193 HANDLE heap = GetProcessHeap();
5194
5195 // If we fail to lock the heap, then gflags.exe has been used
5196 // or some other special heap flag has been set that prevents
5197 // locking. We don't try to walk a heap we can't lock.
5198 if (HeapLock(heap) != 0) {
5199 PROCESS_HEAP_ENTRY phe;
5200 phe.lpData = NULL;
5201 while (HeapWalk(heap, &phe) != 0) {
5202 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5203 !HeapValidate(heap, 0, phe.lpData)) {
5204 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5205 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5206 fatal("corrupted C heap");
5207 }
5208 }
5209 DWORD err = GetLastError();
5210 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5211 fatal(err_msg("heap walk aborted with error %d", err));
5212 }
5213 HeapUnlock(heap);
5214 }
5215 mallocDebugIntervalCounter = 0;
5216 }
5217 return true;
5218 }
5219
5220
5221 bool os::find(address addr, outputStream* st) {
5222 // Nothing yet
5223 return false;
5224 }
5225
5226 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5227 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5228
5229 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5230 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5231 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5232 address addr = (address) exceptionRecord->ExceptionInformation[1];
5233
5234 if (os::is_memory_serialize_page(thread, addr)) {
5235 return EXCEPTION_CONTINUE_EXECUTION;
5236 }
5237 }
5238
5239 return EXCEPTION_CONTINUE_SEARCH;
5240 }
5241
5242 // We don't build a headless jre for Windows
5243 bool os::is_headless_jre() { return false; }
5244
5245 static jint initSock() {
5246 WSADATA wsadata;
5247
5248 if (!os::WinSock2Dll::WinSock2Available()) {
5249 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5250 ::GetLastError());
5251 return JNI_ERR;
5252 }
5253
5254 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5255 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5256 ::GetLastError());
5257 return JNI_ERR;
5258 }
5259 return JNI_OK;
5260 }
5261
5262 struct hostent* os::get_host_by_name(char* name) {
5263 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5264 }
5265
5266 int os::socket_close(int fd) {
5267 return ::closesocket(fd);
5268 }
5269
5270 int os::socket(int domain, int type, int protocol) {
5271 return ::socket(domain, type, protocol);
5272 }
5273
5274 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5275 return ::connect(fd, him, len);
5276 }
5277
5278 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5279 return ::recv(fd, buf, (int)nBytes, flags);
5280 }
5281
5282 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5283 return ::send(fd, buf, (int)nBytes, flags);
5284 }
5285
5286 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5287 return ::send(fd, buf, (int)nBytes, flags);
5288 }
5289
5290 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5291 #if defined(IA32)
5292 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5293 #elif defined (AMD64)
5294 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5295 #endif
5296
5297 // returns true if thread could be suspended,
5298 // false otherwise
5299 static bool do_suspend(HANDLE* h) {
5300 if (h != NULL) {
5301 if (SuspendThread(*h) != ~0) {
5302 return true;
5303 }
5304 }
5305 return false;
5306 }
5307
5308 // resume the thread
5309 // calling resume on an active thread is a no-op
5310 static void do_resume(HANDLE* h) {
5311 if (h != NULL) {
5312 ResumeThread(*h);
5313 }
5314 }
5315
5316 // retrieve a suspend/resume context capable handle
5317 // from the tid. Caller validates handle return value.
5318 void get_thread_handle_for_extended_context(HANDLE* h,
5319 OSThread::thread_id_t tid) {
5320 if (h != NULL) {
5321 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5322 }
5323 }
5324
5325 // Thread sampling implementation
5326 //
5327 void os::SuspendedThreadTask::internal_do_task() {
5328 CONTEXT ctxt;
5329 HANDLE h = NULL;
5330
5331 // get context capable handle for thread
5332 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5333
5334 // sanity
5335 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5336 return;
5337 }
5338
5339 // suspend the thread
5340 if (do_suspend(&h)) {
5341 ctxt.ContextFlags = sampling_context_flags;
5342 // get thread context
5343 GetThreadContext(h, &ctxt);
5344 SuspendedThreadTaskContext context(_thread, &ctxt);
5345 // pass context to Thread Sampling impl
5346 do_task(context);
5347 // resume thread
5348 do_resume(&h);
5349 }
5350
5351 // close handle
5352 CloseHandle(h);
5353 }
5354
5355
5356 // Kernel32 API
5357 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5358 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5359 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5360 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5361 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5362
5363 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5364 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5365 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5366 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5367 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5368
5369
5370 BOOL os::Kernel32Dll::initialized = FALSE;
5371 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5372 assert(initialized && _GetLargePageMinimum != NULL,
5373 "GetLargePageMinimumAvailable() not yet called");
5374 return _GetLargePageMinimum();
5375 }
5376
5377 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5378 if (!initialized) {
5379 initialize();
5380 }
5381 return _GetLargePageMinimum != NULL;
5382 }
5383
5384 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5385 if (!initialized) {
5386 initialize();
5387 }
5388 return _VirtualAllocExNuma != NULL;
5389 }
5390
5391 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5392 SIZE_T bytes, DWORD flags,
5393 DWORD prot, DWORD node) {
5394 assert(initialized && _VirtualAllocExNuma != NULL,
5395 "NUMACallsAvailable() not yet called");
5396
5397 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5398 }
5399
5400 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5401 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5402 "NUMACallsAvailable() not yet called");
5403
5404 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5405 }
5406
5407 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5408 PULONGLONG proc_mask) {
5409 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5410 "NUMACallsAvailable() not yet called");
5411
5412 return _GetNumaNodeProcessorMask(node, proc_mask);
5413 }
5414
5415 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5416 ULONG FrameToCapture,
5417 PVOID* BackTrace,
5418 PULONG BackTraceHash) {
5419 if (!initialized) {
5420 initialize();
5421 }
5422
5423 if (_RtlCaptureStackBackTrace != NULL) {
5424 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5425 BackTrace, BackTraceHash);
5426 } else {
5427 return 0;
5428 }
5429 }
5430
5431 void os::Kernel32Dll::initializeCommon() {
5432 if (!initialized) {
5433 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5434 assert(handle != NULL, "Just check");
5435 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5436 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5437 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5438 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5439 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5440 initialized = TRUE;
5441 }
5442 }
5443
5444
5445
5446 #ifndef JDK6_OR_EARLIER
5447
5448 void os::Kernel32Dll::initialize() {
5449 initializeCommon();
5450 }
5451
5452
5453 // Kernel32 API
5454 inline BOOL os::Kernel32Dll::SwitchToThread() {
5455 return ::SwitchToThread();
5456 }
5457
5458 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5459 return true;
5460 }
5461
5462 // Help tools
5463 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5464 return true;
5465 }
5466
5467 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5468 DWORD th32ProcessId) {
5469 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5470 }
5471
5472 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5473 LPMODULEENTRY32 lpme) {
5474 return ::Module32First(hSnapshot, lpme);
5475 }
5476
5477 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5478 LPMODULEENTRY32 lpme) {
5479 return ::Module32Next(hSnapshot, lpme);
5480 }
5481
5482 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5483 ::GetNativeSystemInfo(lpSystemInfo);
5484 }
5485
5486 // PSAPI API
5487 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5488 HMODULE *lpModule, DWORD cb,
5489 LPDWORD lpcbNeeded) {
5490 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5491 }
5492
5493 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5494 HMODULE hModule,
5495 LPTSTR lpFilename,
5496 DWORD nSize) {
5497 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5498 }
5499
5500 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5501 HMODULE hModule,
5502 LPMODULEINFO lpmodinfo,
5503 DWORD cb) {
5504 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5505 }
5506
5507 inline BOOL os::PSApiDll::PSApiAvailable() {
5508 return true;
5509 }
5510
5511
5512 // WinSock2 API
5513 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5514 LPWSADATA lpWSAData) {
5515 return ::WSAStartup(wVersionRequested, lpWSAData);
5516 }
5517
5518 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5519 return ::gethostbyname(name);
5520 }
5521
5522 inline BOOL os::WinSock2Dll::WinSock2Available() {
5523 return true;
5524 }
5525
5526 // Advapi API
5527 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5528 BOOL DisableAllPrivileges,
5529 PTOKEN_PRIVILEGES NewState,
5530 DWORD BufferLength,
5531 PTOKEN_PRIVILEGES PreviousState,
5532 PDWORD ReturnLength) {
5533 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5534 BufferLength, PreviousState, ReturnLength);
5535 }
5536
5537 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5538 DWORD DesiredAccess,
5539 PHANDLE TokenHandle) {
5540 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5541 }
5542
5543 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5544 LPCTSTR lpName,
5545 PLUID lpLuid) {
5546 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5547 }
5548
5549 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5550 return true;
5551 }
5552
5553 void* os::get_default_process_handle() {
5554 return (void*)GetModuleHandle(NULL);
5555 }
5556
5557 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5558 // which is used to find statically linked in agents.
5559 // Additionally for windows, takes into account __stdcall names.
5560 // Parameters:
5561 // sym_name: Symbol in library we are looking for
5562 // lib_name: Name of library to look in, NULL for shared libs.
5563 // is_absolute_path == true if lib_name is absolute path to agent
5564 // such as "C:/a/b/L.dll"
5565 // == false if only the base name of the library is passed in
5566 // such as "L"
5567 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5568 bool is_absolute_path) {
5569 char *agent_entry_name;
5570 size_t len;
5571 size_t name_len;
5572 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5573 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5574 const char *start;
5575
5576 if (lib_name != NULL) {
5577 len = name_len = strlen(lib_name);
5578 if (is_absolute_path) {
5579 // Need to strip path, prefix and suffix
5580 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5581 lib_name = ++start;
5582 } else {
5583 // Need to check for drive prefix
5584 if ((start = strchr(lib_name, ':')) != NULL) {
5585 lib_name = ++start;
5586 }
5587 }
5588 if (len <= (prefix_len + suffix_len)) {
5589 return NULL;
5590 }
5591 lib_name += prefix_len;
5592 name_len = strlen(lib_name) - suffix_len;
5593 }
5594 }
5595 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5596 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5597 if (agent_entry_name == NULL) {
5598 return NULL;
5599 }
5600 if (lib_name != NULL) {
5601 const char *p = strrchr(sym_name, '@');
5602 if (p != NULL && p != sym_name) {
5603 // sym_name == _Agent_OnLoad@XX
5604 strncpy(agent_entry_name, sym_name, (p - sym_name));
5605 agent_entry_name[(p-sym_name)] = '\0';
5606 // agent_entry_name == _Agent_OnLoad
5607 strcat(agent_entry_name, "_");
5608 strncat(agent_entry_name, lib_name, name_len);
5609 strcat(agent_entry_name, p);
5610 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5611 } else {
5612 strcpy(agent_entry_name, sym_name);
5613 strcat(agent_entry_name, "_");
5614 strncat(agent_entry_name, lib_name, name_len);
5615 }
5616 } else {
5617 strcpy(agent_entry_name, sym_name);
5618 }
5619 return agent_entry_name;
5620 }
5621
5622 #else
5623 // Kernel32 API
5624 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5625 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5626 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5627 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5628 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5629
5630 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5631 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5632 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5633 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5634 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5635
5636 void os::Kernel32Dll::initialize() {
5637 if (!initialized) {
5638 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5639 assert(handle != NULL, "Just check");
5640
5641 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5642 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5643 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5644 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5645 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5646 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5647 initializeCommon(); // resolve the functions that always need resolving
5648
5649 initialized = TRUE;
5650 }
5651 }
5652
5653 BOOL os::Kernel32Dll::SwitchToThread() {
5654 assert(initialized && _SwitchToThread != NULL,
5655 "SwitchToThreadAvailable() not yet called");
5656 return _SwitchToThread();
5657 }
5658
5659
5660 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5661 if (!initialized) {
5662 initialize();
5663 }
5664 return _SwitchToThread != NULL;
5665 }
5666
5667 // Help tools
5668 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5669 if (!initialized) {
5670 initialize();
5671 }
5672 return _CreateToolhelp32Snapshot != NULL &&
5673 _Module32First != NULL &&
5674 _Module32Next != NULL;
5675 }
5676
5677 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5678 DWORD th32ProcessId) {
5679 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5680 "HelpToolsAvailable() not yet called");
5681
5682 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5683 }
5684
5685 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5686 assert(initialized && _Module32First != NULL,
5687 "HelpToolsAvailable() not yet called");
5688
5689 return _Module32First(hSnapshot, lpme);
5690 }
5691
5692 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5693 LPMODULEENTRY32 lpme) {
5694 assert(initialized && _Module32Next != NULL,
5695 "HelpToolsAvailable() not yet called");
5696
5697 return _Module32Next(hSnapshot, lpme);
5698 }
5699
5700
5701 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5702 if (!initialized) {
5703 initialize();
5704 }
5705 return _GetNativeSystemInfo != NULL;
5706 }
5707
5708 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5709 assert(initialized && _GetNativeSystemInfo != NULL,
5710 "GetNativeSystemInfoAvailable() not yet called");
5711
5712 _GetNativeSystemInfo(lpSystemInfo);
5713 }
5714
5715 // PSAPI API
5716
5717
5718 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5719 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5720 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5721
5722 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5723 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5724 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5725 BOOL os::PSApiDll::initialized = FALSE;
5726
5727 void os::PSApiDll::initialize() {
5728 if (!initialized) {
5729 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5730 if (handle != NULL) {
5731 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5732 "EnumProcessModules");
5733 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5734 "GetModuleFileNameExA");
5735 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5736 "GetModuleInformation");
5737 }
5738 initialized = TRUE;
5739 }
5740 }
5741
5742
5743
5744 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5745 DWORD cb, LPDWORD lpcbNeeded) {
5746 assert(initialized && _EnumProcessModules != NULL,
5747 "PSApiAvailable() not yet called");
5748 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5749 }
5750
5751 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5752 LPTSTR lpFilename, DWORD nSize) {
5753 assert(initialized && _GetModuleFileNameEx != NULL,
5754 "PSApiAvailable() not yet called");
5755 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5756 }
5757
5758 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5759 LPMODULEINFO lpmodinfo, DWORD cb) {
5760 assert(initialized && _GetModuleInformation != NULL,
5761 "PSApiAvailable() not yet called");
5762 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5763 }
5764
5765 BOOL os::PSApiDll::PSApiAvailable() {
5766 if (!initialized) {
5767 initialize();
5768 }
5769 return _EnumProcessModules != NULL &&
5770 _GetModuleFileNameEx != NULL &&
5771 _GetModuleInformation != NULL;
5772 }
5773
5774
5775 // WinSock2 API
5776 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5777 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5778
5779 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5780 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5781 BOOL os::WinSock2Dll::initialized = FALSE;
5782
5783 void os::WinSock2Dll::initialize() {
5784 if (!initialized) {
5785 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5786 if (handle != NULL) {
5787 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5788 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5789 }
5790 initialized = TRUE;
5791 }
5792 }
5793
5794
5795 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5796 assert(initialized && _WSAStartup != NULL,
5797 "WinSock2Available() not yet called");
5798 return _WSAStartup(wVersionRequested, lpWSAData);
5799 }
5800
5801 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5802 assert(initialized && _gethostbyname != NULL,
5803 "WinSock2Available() not yet called");
5804 return _gethostbyname(name);
5805 }
5806
5807 BOOL os::WinSock2Dll::WinSock2Available() {
5808 if (!initialized) {
5809 initialize();
5810 }
5811 return _WSAStartup != NULL &&
5812 _gethostbyname != NULL;
5813 }
5814
5815 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5816 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5817 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5818
5819 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5820 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5821 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5822 BOOL os::Advapi32Dll::initialized = FALSE;
5823
5824 void os::Advapi32Dll::initialize() {
5825 if (!initialized) {
5826 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5827 if (handle != NULL) {
5828 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5829 "AdjustTokenPrivileges");
5830 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5831 "OpenProcessToken");
5832 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5833 "LookupPrivilegeValueA");
5834 }
5835 initialized = TRUE;
5836 }
5837 }
5838
5839 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5840 BOOL DisableAllPrivileges,
5841 PTOKEN_PRIVILEGES NewState,
5842 DWORD BufferLength,
5843 PTOKEN_PRIVILEGES PreviousState,
5844 PDWORD ReturnLength) {
5845 assert(initialized && _AdjustTokenPrivileges != NULL,
5846 "AdvapiAvailable() not yet called");
5847 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5848 BufferLength, PreviousState, ReturnLength);
5849 }
5850
5851 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5852 DWORD DesiredAccess,
5853 PHANDLE TokenHandle) {
5854 assert(initialized && _OpenProcessToken != NULL,
5855 "AdvapiAvailable() not yet called");
5856 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5857 }
5858
5859 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5860 LPCTSTR lpName, PLUID lpLuid) {
5861 assert(initialized && _LookupPrivilegeValue != NULL,
5862 "AdvapiAvailable() not yet called");
5863 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5864 }
5865
5866 BOOL os::Advapi32Dll::AdvapiAvailable() {
5867 if (!initialized) {
5868 initialize();
5869 }
5870 return _AdjustTokenPrivileges != NULL &&
5871 _OpenProcessToken != NULL &&
5872 _LookupPrivilegeValue != NULL;
5873 }
5874
5875 #endif
5876
5877 #ifndef PRODUCT
5878
5879 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5880 // contiguous memory block at a particular address.
5881 // The test first tries to find a good approximate address to allocate at by using the same
5882 // method to allocate some memory at any address. The test then tries to allocate memory in
5883 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5884 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5885 // the previously allocated memory is available for allocation. The only actual failure
5886 // that is reported is when the test tries to allocate at a particular location but gets a
5887 // different valid one. A NULL return value at this point is not considered an error but may
5888 // be legitimate.
5889 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5890 void TestReserveMemorySpecial_test() {
5891 if (!UseLargePages) {
5892 if (VerboseInternalVMTests) {
5893 gclog_or_tty->print("Skipping test because large pages are disabled");
5894 }
5895 return;
5896 }
5897 // save current value of globals
5898 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5899 bool old_use_numa_interleaving = UseNUMAInterleaving;
5900
5901 // set globals to make sure we hit the correct code path
5902 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5903
5904 // do an allocation at an address selected by the OS to get a good one.
5905 const size_t large_allocation_size = os::large_page_size() * 4;
5906 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5907 if (result == NULL) {
5908 if (VerboseInternalVMTests) {
5909 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5910 large_allocation_size);
5911 }
5912 } else {
5913 os::release_memory_special(result, large_allocation_size);
5914
5915 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5916 // we managed to get it once.
5917 const size_t expected_allocation_size = os::large_page_size();
5918 char* expected_location = result + os::large_page_size();
5919 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5920 if (actual_location == NULL) {
5921 if (VerboseInternalVMTests) {
5922 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5923 expected_location, large_allocation_size);
5924 }
5925 } else {
5926 // release memory
5927 os::release_memory_special(actual_location, expected_allocation_size);
5928 // only now check, after releasing any memory to avoid any leaks.
5929 assert(actual_location == expected_location,
5930 err_msg("Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5931 expected_location, expected_allocation_size, actual_location));
5932 }
5933 }
5934
5935 // restore globals
5936 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5937 UseNUMAInterleaving = old_use_numa_interleaving;
5938 }
5939 #endif // PRODUCT