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 #ifndef PRODUCT
1597 bool os::get_host_name(char* buf, size_t buflen) {
1598 DWORD size = (DWORD)buflen;
1599 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1600 }
1601 #endif // PRODUCT
1602
1603 void os::get_summary_os_info(char* buf, size_t buflen) {
1604 stringStream sst(buf, buflen);
1605 os::win32::print_windows_version(&sst);
1606 // chop off newline character
1607 char* nl = strchr(buf, '\n');
1608 if (nl != NULL) *nl = '\0';
1609 }
1610
1611 void os::print_os_info_brief(outputStream* st) {
1612 os::print_os_info(st);
1613 }
1614
1615 void os::print_os_info(outputStream* st) {
1616 #ifdef ASSERT
1617 char buffer[1024];
1618 DWORD size = sizeof(buffer);
1619 st->print("HostName: ");
1620 if (GetComputerNameEx(ComputerNameDnsHostname, buffer, &size)) {
1621 st->print("%s ", buffer);
1622 } else {
1623 st->print("N/A ");
1624 }
1625 #endif
1626 st->print("OS:");
1627 os::win32::print_windows_version(st);
1628 }
1629
1630 void os::win32::print_windows_version(outputStream* st) {
1631 OSVERSIONINFOEX osvi;
1632 VS_FIXEDFILEINFO *file_info;
1633 TCHAR kernel32_path[MAX_PATH];
1634 UINT len, ret;
1635
1636 // Use the GetVersionEx information to see if we're on a server or
1637 // workstation edition of Windows. Starting with Windows 8.1 we can't
1638 // trust the OS version information returned by this API.
1639 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1640 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1641 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1642 st->print_cr("Call to GetVersionEx failed");
1643 return;
1644 }
1645 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1646
1647 // Get the full path to \Windows\System32\kernel32.dll and use that for
1648 // determining what version of Windows we're running on.
1649 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1650 ret = GetSystemDirectory(kernel32_path, len);
1651 if (ret == 0 || ret > len) {
1652 st->print_cr("Call to GetSystemDirectory failed");
1653 return;
1654 }
1655 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1656
1657 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1658 if (version_size == 0) {
1659 st->print_cr("Call to GetFileVersionInfoSize failed");
1660 return;
1661 }
1662
1663 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1664 if (version_info == NULL) {
1665 st->print_cr("Failed to allocate version_info");
1666 return;
1667 }
1668
1669 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1670 os::free(version_info);
1671 st->print_cr("Call to GetFileVersionInfo failed");
1672 return;
1673 }
1674
1675 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1676 os::free(version_info);
1677 st->print_cr("Call to VerQueryValue failed");
1678 return;
1679 }
1680
1681 int major_version = HIWORD(file_info->dwProductVersionMS);
1682 int minor_version = LOWORD(file_info->dwProductVersionMS);
1683 int build_number = HIWORD(file_info->dwProductVersionLS);
1684 int build_minor = LOWORD(file_info->dwProductVersionLS);
1685 int os_vers = major_version * 1000 + minor_version;
1686 os::free(version_info);
1687
1688 st->print(" Windows ");
1689 switch (os_vers) {
1690
1691 case 6000:
1692 if (is_workstation) {
1693 st->print("Vista");
1694 } else {
1695 st->print("Server 2008");
1696 }
1697 break;
1698
1699 case 6001:
1700 if (is_workstation) {
1701 st->print("7");
1702 } else {
1703 st->print("Server 2008 R2");
1704 }
1705 break;
1706
1707 case 6002:
1708 if (is_workstation) {
1709 st->print("8");
1710 } else {
1711 st->print("Server 2012");
1712 }
1713 break;
1714
1715 case 6003:
1716 if (is_workstation) {
1717 st->print("8.1");
1718 } else {
1719 st->print("Server 2012 R2");
1720 }
1721 break;
1722
1723 case 10000:
1724 if (is_workstation) {
1725 st->print("10");
1726 } else {
1727 // The server version name of Windows 10 is not known at this time
1728 st->print("%d.%d", major_version, minor_version);
1729 }
1730 break;
1731
1732 default:
1733 // Unrecognized windows, print out its major and minor versions
1734 st->print("%d.%d", major_version, minor_version);
1735 break;
1736 }
1737
1738 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1739 // find out whether we are running on 64 bit processor or not
1740 SYSTEM_INFO si;
1741 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1742 os::Kernel32Dll::GetNativeSystemInfo(&si);
1743 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1744 st->print(" , 64 bit");
1745 }
1746
1747 st->print(" Build %d", build_number);
1748 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1749 st->cr();
1750 }
1751
1752 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1753 // Nothing to do for now.
1754 }
1755
1756 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1757 HKEY key;
1758 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1759 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1760 if (status == ERROR_SUCCESS) {
1761 DWORD size = (DWORD)buflen;
1762 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1763 if (status != ERROR_SUCCESS) {
1764 strncpy(buf, "## __CPU__", buflen);
1765 }
1766 RegCloseKey(key);
1767 } else {
1768 // Put generic cpu info to return
1769 strncpy(buf, "## __CPU__", buflen);
1770 }
1771 }
1772
1773 void os::print_memory_info(outputStream* st) {
1774 st->print("Memory:");
1775 st->print(" %dk page", os::vm_page_size()>>10);
1776
1777 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1778 // value if total memory is larger than 4GB
1779 MEMORYSTATUSEX ms;
1780 ms.dwLength = sizeof(ms);
1781 GlobalMemoryStatusEx(&ms);
1782
1783 st->print(", physical %uk", os::physical_memory() >> 10);
1784 st->print("(%uk free)", os::available_memory() >> 10);
1785
1786 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1787 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1788 st->cr();
1789 }
1790
1791 void os::print_siginfo(outputStream *st, void *siginfo) {
1792 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1793 st->print("siginfo:");
1794 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1795
1796 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1797 er->NumberParameters >= 2) {
1798 switch (er->ExceptionInformation[0]) {
1799 case 0: st->print(", reading address"); break;
1800 case 1: st->print(", writing address"); break;
1801 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1802 er->ExceptionInformation[0]);
1803 }
1804 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1805 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1806 er->NumberParameters >= 2 && UseSharedSpaces) {
1807 FileMapInfo* mapinfo = FileMapInfo::current_info();
1808 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1809 st->print("\n\nError accessing class data sharing archive." \
1810 " Mapped file inaccessible during execution, " \
1811 " possible disk/network problem.");
1812 }
1813 } else {
1814 int num = er->NumberParameters;
1815 if (num > 0) {
1816 st->print(", ExceptionInformation=");
1817 for (int i = 0; i < num; i++) {
1818 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1819 }
1820 }
1821 }
1822 st->cr();
1823 }
1824
1825 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1826 // do nothing
1827 }
1828
1829 static char saved_jvm_path[MAX_PATH] = {0};
1830
1831 // Find the full path to the current module, jvm.dll
1832 void os::jvm_path(char *buf, jint buflen) {
1833 // Error checking.
1834 if (buflen < MAX_PATH) {
1835 assert(false, "must use a large-enough buffer");
1836 buf[0] = '\0';
1837 return;
1838 }
1839 // Lazy resolve the path to current module.
1840 if (saved_jvm_path[0] != 0) {
1841 strcpy(buf, saved_jvm_path);
1842 return;
1843 }
1844
1845 buf[0] = '\0';
1846 if (Arguments::sun_java_launcher_is_altjvm()) {
1847 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1848 // for a JAVA_HOME environment variable and fix up the path so it
1849 // looks like jvm.dll is installed there (append a fake suffix
1850 // hotspot/jvm.dll).
1851 char* java_home_var = ::getenv("JAVA_HOME");
1852 if (java_home_var != NULL && java_home_var[0] != 0 &&
1853 strlen(java_home_var) < (size_t)buflen) {
1854 strncpy(buf, java_home_var, buflen);
1855
1856 // determine if this is a legacy image or modules image
1857 // modules image doesn't have "jre" subdirectory
1858 size_t len = strlen(buf);
1859 char* jrebin_p = buf + len;
1860 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1861 if (0 != _access(buf, 0)) {
1862 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1863 }
1864 len = strlen(buf);
1865 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1866 }
1867 }
1868
1869 if (buf[0] == '\0') {
1870 GetModuleFileName(vm_lib_handle, buf, buflen);
1871 }
1872 strncpy(saved_jvm_path, buf, MAX_PATH);
1873 saved_jvm_path[MAX_PATH - 1] = '\0';
1874 }
1875
1876
1877 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1878 #ifndef _WIN64
1879 st->print("_");
1880 #endif
1881 }
1882
1883
1884 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1885 #ifndef _WIN64
1886 st->print("@%d", args_size * sizeof(int));
1887 #endif
1888 }
1889
1890 // This method is a copy of JDK's sysGetLastErrorString
1891 // from src/windows/hpi/src/system_md.c
1892
1893 size_t os::lasterror(char* buf, size_t len) {
1894 DWORD errval;
1895
1896 if ((errval = GetLastError()) != 0) {
1897 // DOS error
1898 size_t n = (size_t)FormatMessage(
1899 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1900 NULL,
1901 errval,
1902 0,
1903 buf,
1904 (DWORD)len,
1905 NULL);
1906 if (n > 3) {
1907 // Drop final '.', CR, LF
1908 if (buf[n - 1] == '\n') n--;
1909 if (buf[n - 1] == '\r') n--;
1910 if (buf[n - 1] == '.') n--;
1911 buf[n] = '\0';
1912 }
1913 return n;
1914 }
1915
1916 if (errno != 0) {
1917 // C runtime error that has no corresponding DOS error code
1918 const char* s = strerror(errno);
1919 size_t n = strlen(s);
1920 if (n >= len) n = len - 1;
1921 strncpy(buf, s, n);
1922 buf[n] = '\0';
1923 return n;
1924 }
1925
1926 return 0;
1927 }
1928
1929 int os::get_last_error() {
1930 DWORD error = GetLastError();
1931 if (error == 0) {
1932 error = errno;
1933 }
1934 return (int)error;
1935 }
1936
1937 WindowsSemaphore::WindowsSemaphore(uint value) {
1938 _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);
1939
1940 guarantee(_semaphore != NULL, err_msg("CreateSemaphore failed with error code: %lu", GetLastError()));
1941 }
1942
1943 WindowsSemaphore::~WindowsSemaphore() {
1944 ::CloseHandle(_semaphore);
1945 }
1946
1947 void WindowsSemaphore::signal(uint count) {
1948 if (count > 0) {
1949 BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);
1950
1951 assert(ret != 0, err_msg("ReleaseSemaphore failed with error code: %lu", GetLastError()));
1952 }
1953 }
1954
1955 void WindowsSemaphore::wait() {
1956 DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);
1957 assert(ret != WAIT_FAILED, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError()));
1958 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed with return value: %lu", ret));
1959 }
1960
1961 // sun.misc.Signal
1962 // NOTE that this is a workaround for an apparent kernel bug where if
1963 // a signal handler for SIGBREAK is installed then that signal handler
1964 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1965 // See bug 4416763.
1966 static void (*sigbreakHandler)(int) = NULL;
1967
1968 static void UserHandler(int sig, void *siginfo, void *context) {
1969 os::signal_notify(sig);
1970 // We need to reinstate the signal handler each time...
1971 os::signal(sig, (void*)UserHandler);
1972 }
1973
1974 void* os::user_handler() {
1975 return (void*) UserHandler;
1976 }
1977
1978 void* os::signal(int signal_number, void* handler) {
1979 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1980 void (*oldHandler)(int) = sigbreakHandler;
1981 sigbreakHandler = (void (*)(int)) handler;
1982 return (void*) oldHandler;
1983 } else {
1984 return (void*)::signal(signal_number, (void (*)(int))handler);
1985 }
1986 }
1987
1988 void os::signal_raise(int signal_number) {
1989 raise(signal_number);
1990 }
1991
1992 // The Win32 C runtime library maps all console control events other than ^C
1993 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1994 // logoff, and shutdown events. We therefore install our own console handler
1995 // that raises SIGTERM for the latter cases.
1996 //
1997 static BOOL WINAPI consoleHandler(DWORD event) {
1998 switch (event) {
1999 case CTRL_C_EVENT:
2000 if (is_error_reported()) {
2001 // Ctrl-C is pressed during error reporting, likely because the error
2002 // handler fails to abort. Let VM die immediately.
2003 os::die();
2004 }
2005
2006 os::signal_raise(SIGINT);
2007 return TRUE;
2008 break;
2009 case CTRL_BREAK_EVENT:
2010 if (sigbreakHandler != NULL) {
2011 (*sigbreakHandler)(SIGBREAK);
2012 }
2013 return TRUE;
2014 break;
2015 case CTRL_LOGOFF_EVENT: {
2016 // Don't terminate JVM if it is running in a non-interactive session,
2017 // such as a service process.
2018 USEROBJECTFLAGS flags;
2019 HANDLE handle = GetProcessWindowStation();
2020 if (handle != NULL &&
2021 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2022 sizeof(USEROBJECTFLAGS), NULL)) {
2023 // If it is a non-interactive session, let next handler to deal
2024 // with it.
2025 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2026 return FALSE;
2027 }
2028 }
2029 }
2030 case CTRL_CLOSE_EVENT:
2031 case CTRL_SHUTDOWN_EVENT:
2032 os::signal_raise(SIGTERM);
2033 return TRUE;
2034 break;
2035 default:
2036 break;
2037 }
2038 return FALSE;
2039 }
2040
2041 // The following code is moved from os.cpp for making this
2042 // code platform specific, which it is by its very nature.
2043
2044 // Return maximum OS signal used + 1 for internal use only
2045 // Used as exit signal for signal_thread
2046 int os::sigexitnum_pd() {
2047 return NSIG;
2048 }
2049
2050 // a counter for each possible signal value, including signal_thread exit signal
2051 static volatile jint pending_signals[NSIG+1] = { 0 };
2052 static HANDLE sig_sem = NULL;
2053
2054 void os::signal_init_pd() {
2055 // Initialize signal structures
2056 memset((void*)pending_signals, 0, sizeof(pending_signals));
2057
2058 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2059
2060 // Programs embedding the VM do not want it to attempt to receive
2061 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2062 // shutdown hooks mechanism introduced in 1.3. For example, when
2063 // the VM is run as part of a Windows NT service (i.e., a servlet
2064 // engine in a web server), the correct behavior is for any console
2065 // control handler to return FALSE, not TRUE, because the OS's
2066 // "final" handler for such events allows the process to continue if
2067 // it is a service (while terminating it if it is not a service).
2068 // To make this behavior uniform and the mechanism simpler, we
2069 // completely disable the VM's usage of these console events if -Xrs
2070 // (=ReduceSignalUsage) is specified. This means, for example, that
2071 // the CTRL-BREAK thread dump mechanism is also disabled in this
2072 // case. See bugs 4323062, 4345157, and related bugs.
2073
2074 if (!ReduceSignalUsage) {
2075 // Add a CTRL-C handler
2076 SetConsoleCtrlHandler(consoleHandler, TRUE);
2077 }
2078 }
2079
2080 void os::signal_notify(int signal_number) {
2081 BOOL ret;
2082 if (sig_sem != NULL) {
2083 Atomic::inc(&pending_signals[signal_number]);
2084 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2085 assert(ret != 0, "ReleaseSemaphore() failed");
2086 }
2087 }
2088
2089 static int check_pending_signals(bool wait_for_signal) {
2090 DWORD ret;
2091 while (true) {
2092 for (int i = 0; i < NSIG + 1; i++) {
2093 jint n = pending_signals[i];
2094 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2095 return i;
2096 }
2097 }
2098 if (!wait_for_signal) {
2099 return -1;
2100 }
2101
2102 JavaThread *thread = JavaThread::current();
2103
2104 ThreadBlockInVM tbivm(thread);
2105
2106 bool threadIsSuspended;
2107 do {
2108 thread->set_suspend_equivalent();
2109 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2110 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2111 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2112
2113 // were we externally suspended while we were waiting?
2114 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2115 if (threadIsSuspended) {
2116 // The semaphore has been incremented, but while we were waiting
2117 // another thread suspended us. We don't want to continue running
2118 // while suspended because that would surprise the thread that
2119 // suspended us.
2120 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2121 assert(ret != 0, "ReleaseSemaphore() failed");
2122
2123 thread->java_suspend_self();
2124 }
2125 } while (threadIsSuspended);
2126 }
2127 }
2128
2129 int os::signal_lookup() {
2130 return check_pending_signals(false);
2131 }
2132
2133 int os::signal_wait() {
2134 return check_pending_signals(true);
2135 }
2136
2137 // Implicit OS exception handling
2138
2139 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2140 address handler) {
2141 JavaThread* thread = JavaThread::current();
2142 // Save pc in thread
2143 #ifdef _M_IA64
2144 // Do not blow up if no thread info available.
2145 if (thread) {
2146 // Saving PRECISE pc (with slot information) in thread.
2147 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2148 // Convert precise PC into "Unix" format
2149 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2150 thread->set_saved_exception_pc((address)precise_pc);
2151 }
2152 // Set pc to handler
2153 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2154 // Clear out psr.ri (= Restart Instruction) in order to continue
2155 // at the beginning of the target bundle.
2156 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2157 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2158 #else
2159 #ifdef _M_AMD64
2160 // Do not blow up if no thread info available.
2161 if (thread) {
2162 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2163 }
2164 // Set pc to handler
2165 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2166 #else
2167 // Do not blow up if no thread info available.
2168 if (thread) {
2169 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2170 }
2171 // Set pc to handler
2172 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2173 #endif
2174 #endif
2175
2176 // Continue the execution
2177 return EXCEPTION_CONTINUE_EXECUTION;
2178 }
2179
2180
2181 // Used for PostMortemDump
2182 extern "C" void safepoints();
2183 extern "C" void find(int x);
2184 extern "C" void events();
2185
2186 // According to Windows API documentation, an illegal instruction sequence should generate
2187 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2188 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2189 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2190
2191 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2192
2193 // From "Execution Protection in the Windows Operating System" draft 0.35
2194 // Once a system header becomes available, the "real" define should be
2195 // included or copied here.
2196 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2197
2198 // Handle NAT Bit consumption on IA64.
2199 #ifdef _M_IA64
2200 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2201 #endif
2202
2203 // Windows Vista/2008 heap corruption check
2204 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2205
2206 #define def_excpt(val) #val, val
2207
2208 struct siglabel {
2209 char *name;
2210 int number;
2211 };
2212
2213 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2214 // C++ compiler contain this error code. Because this is a compiler-generated
2215 // error, the code is not listed in the Win32 API header files.
2216 // The code is actually a cryptic mnemonic device, with the initial "E"
2217 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2218 // ASCII values of "msc".
2219
2220 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2221
2222
2223 struct siglabel exceptlabels[] = {
2224 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2225 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2226 def_excpt(EXCEPTION_BREAKPOINT),
2227 def_excpt(EXCEPTION_SINGLE_STEP),
2228 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2229 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2230 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2231 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2232 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2233 def_excpt(EXCEPTION_FLT_OVERFLOW),
2234 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2235 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2236 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2237 def_excpt(EXCEPTION_INT_OVERFLOW),
2238 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2239 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2240 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2241 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2242 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2243 def_excpt(EXCEPTION_STACK_OVERFLOW),
2244 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2245 def_excpt(EXCEPTION_GUARD_PAGE),
2246 def_excpt(EXCEPTION_INVALID_HANDLE),
2247 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2248 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2249 #ifdef _M_IA64
2250 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2251 #endif
2252 NULL, 0
2253 };
2254
2255 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2256 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2257 if (exceptlabels[i].number == exception_code) {
2258 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2259 return buf;
2260 }
2261 }
2262
2263 return NULL;
2264 }
2265
2266 //-----------------------------------------------------------------------------
2267 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2268 // handle exception caused by idiv; should only happen for -MinInt/-1
2269 // (division by zero is handled explicitly)
2270 #ifdef _M_IA64
2271 assert(0, "Fix Handle_IDiv_Exception");
2272 #else
2273 #ifdef _M_AMD64
2274 PCONTEXT ctx = exceptionInfo->ContextRecord;
2275 address pc = (address)ctx->Rip;
2276 assert(pc[0] == 0xF7, "not an idiv opcode");
2277 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2278 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2279 // set correct result values and continue after idiv instruction
2280 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2281 ctx->Rax = (DWORD)min_jint; // result
2282 ctx->Rdx = (DWORD)0; // remainder
2283 // Continue the execution
2284 #else
2285 PCONTEXT ctx = exceptionInfo->ContextRecord;
2286 address pc = (address)ctx->Eip;
2287 assert(pc[0] == 0xF7, "not an idiv opcode");
2288 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2289 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2290 // set correct result values and continue after idiv instruction
2291 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2292 ctx->Eax = (DWORD)min_jint; // result
2293 ctx->Edx = (DWORD)0; // remainder
2294 // Continue the execution
2295 #endif
2296 #endif
2297 return EXCEPTION_CONTINUE_EXECUTION;
2298 }
2299
2300 //-----------------------------------------------------------------------------
2301 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2302 PCONTEXT ctx = exceptionInfo->ContextRecord;
2303 #ifndef _WIN64
2304 // handle exception caused by native method modifying control word
2305 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2306
2307 switch (exception_code) {
2308 case EXCEPTION_FLT_DENORMAL_OPERAND:
2309 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2310 case EXCEPTION_FLT_INEXACT_RESULT:
2311 case EXCEPTION_FLT_INVALID_OPERATION:
2312 case EXCEPTION_FLT_OVERFLOW:
2313 case EXCEPTION_FLT_STACK_CHECK:
2314 case EXCEPTION_FLT_UNDERFLOW:
2315 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2316 if (fp_control_word != ctx->FloatSave.ControlWord) {
2317 // Restore FPCW and mask out FLT exceptions
2318 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2319 // Mask out pending FLT exceptions
2320 ctx->FloatSave.StatusWord &= 0xffffff00;
2321 return EXCEPTION_CONTINUE_EXECUTION;
2322 }
2323 }
2324
2325 if (prev_uef_handler != NULL) {
2326 // We didn't handle this exception so pass it to the previous
2327 // UnhandledExceptionFilter.
2328 return (prev_uef_handler)(exceptionInfo);
2329 }
2330 #else // !_WIN64
2331 // On Windows, the mxcsr control bits are non-volatile across calls
2332 // See also CR 6192333
2333 //
2334 jint MxCsr = INITIAL_MXCSR;
2335 // we can't use StubRoutines::addr_mxcsr_std()
2336 // because in Win64 mxcsr is not saved there
2337 if (MxCsr != ctx->MxCsr) {
2338 ctx->MxCsr = MxCsr;
2339 return EXCEPTION_CONTINUE_EXECUTION;
2340 }
2341 #endif // !_WIN64
2342
2343 return EXCEPTION_CONTINUE_SEARCH;
2344 }
2345
2346 static inline void report_error(Thread* t, DWORD exception_code,
2347 address addr, void* siginfo, void* context) {
2348 VMError err(t, exception_code, addr, siginfo, context);
2349 err.report_and_die();
2350
2351 // If UseOsErrorReporting, this will return here and save the error file
2352 // somewhere where we can find it in the minidump.
2353 }
2354
2355 //-----------------------------------------------------------------------------
2356 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2357 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2358 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2359 #ifdef _M_IA64
2360 // On Itanium, we need the "precise pc", which has the slot number coded
2361 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2362 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2363 // Convert the pc to "Unix format", which has the slot number coded
2364 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2365 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2366 // information is saved in the Unix format.
2367 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2368 #else
2369 #ifdef _M_AMD64
2370 address pc = (address) exceptionInfo->ContextRecord->Rip;
2371 #else
2372 address pc = (address) exceptionInfo->ContextRecord->Eip;
2373 #endif
2374 #endif
2375 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2376
2377 // Handle SafeFetch32 and SafeFetchN exceptions.
2378 if (StubRoutines::is_safefetch_fault(pc)) {
2379 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2380 }
2381
2382 #ifndef _WIN64
2383 // Execution protection violation - win32 running on AMD64 only
2384 // Handled first to avoid misdiagnosis as a "normal" access violation;
2385 // This is safe to do because we have a new/unique ExceptionInformation
2386 // code for this condition.
2387 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2388 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2389 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2390 address addr = (address) exceptionRecord->ExceptionInformation[1];
2391
2392 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2393 int page_size = os::vm_page_size();
2394
2395 // Make sure the pc and the faulting address are sane.
2396 //
2397 // If an instruction spans a page boundary, and the page containing
2398 // the beginning of the instruction is executable but the following
2399 // page is not, the pc and the faulting address might be slightly
2400 // different - we still want to unguard the 2nd page in this case.
2401 //
2402 // 15 bytes seems to be a (very) safe value for max instruction size.
2403 bool pc_is_near_addr =
2404 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2405 bool instr_spans_page_boundary =
2406 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2407 (intptr_t) page_size) > 0);
2408
2409 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2410 static volatile address last_addr =
2411 (address) os::non_memory_address_word();
2412
2413 // In conservative mode, don't unguard unless the address is in the VM
2414 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2415 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2416
2417 // Set memory to RWX and retry
2418 address page_start =
2419 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2420 bool res = os::protect_memory((char*) page_start, page_size,
2421 os::MEM_PROT_RWX);
2422
2423 if (PrintMiscellaneous && Verbose) {
2424 char buf[256];
2425 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2426 "at " INTPTR_FORMAT
2427 ", unguarding " INTPTR_FORMAT ": %s", addr,
2428 page_start, (res ? "success" : strerror(errno)));
2429 tty->print_raw_cr(buf);
2430 }
2431
2432 // Set last_addr so if we fault again at the same address, we don't
2433 // end up in an endless loop.
2434 //
2435 // There are two potential complications here. Two threads trapping
2436 // at the same address at the same time could cause one of the
2437 // threads to think it already unguarded, and abort the VM. Likely
2438 // very rare.
2439 //
2440 // The other race involves two threads alternately trapping at
2441 // different addresses and failing to unguard the page, resulting in
2442 // an endless loop. This condition is probably even more unlikely
2443 // than the first.
2444 //
2445 // Although both cases could be avoided by using locks or thread
2446 // local last_addr, these solutions are unnecessary complication:
2447 // this handler is a best-effort safety net, not a complete solution.
2448 // It is disabled by default and should only be used as a workaround
2449 // in case we missed any no-execute-unsafe VM code.
2450
2451 last_addr = addr;
2452
2453 return EXCEPTION_CONTINUE_EXECUTION;
2454 }
2455 }
2456
2457 // Last unguard failed or not unguarding
2458 tty->print_raw_cr("Execution protection violation");
2459 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2460 exceptionInfo->ContextRecord);
2461 return EXCEPTION_CONTINUE_SEARCH;
2462 }
2463 }
2464 #endif // _WIN64
2465
2466 // Check to see if we caught the safepoint code in the
2467 // process of write protecting the memory serialization page.
2468 // It write enables the page immediately after protecting it
2469 // so just return.
2470 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2471 JavaThread* thread = (JavaThread*) t;
2472 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2473 address addr = (address) exceptionRecord->ExceptionInformation[1];
2474 if (os::is_memory_serialize_page(thread, addr)) {
2475 // Block current thread until the memory serialize page permission restored.
2476 os::block_on_serialize_page_trap();
2477 return EXCEPTION_CONTINUE_EXECUTION;
2478 }
2479 }
2480
2481 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2482 VM_Version::is_cpuinfo_segv_addr(pc)) {
2483 // Verify that OS save/restore AVX registers.
2484 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2485 }
2486
2487 if (t != NULL && t->is_Java_thread()) {
2488 JavaThread* thread = (JavaThread*) t;
2489 bool in_java = thread->thread_state() == _thread_in_Java;
2490
2491 // Handle potential stack overflows up front.
2492 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2493 if (os::uses_stack_guard_pages()) {
2494 #ifdef _M_IA64
2495 // Use guard page for register stack.
2496 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2497 address addr = (address) exceptionRecord->ExceptionInformation[1];
2498 // Check for a register stack overflow on Itanium
2499 if (thread->addr_inside_register_stack_red_zone(addr)) {
2500 // Fatal red zone violation happens if the Java program
2501 // catches a StackOverflow error and does so much processing
2502 // that it runs beyond the unprotected yellow guard zone. As
2503 // a result, we are out of here.
2504 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2505 } else if(thread->addr_inside_register_stack(addr)) {
2506 // Disable the yellow zone which sets the state that
2507 // we've got a stack overflow problem.
2508 if (thread->stack_yellow_zone_enabled()) {
2509 thread->disable_stack_yellow_zone();
2510 }
2511 // Give us some room to process the exception.
2512 thread->disable_register_stack_guard();
2513 // Tracing with +Verbose.
2514 if (Verbose) {
2515 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2516 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2517 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2518 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2519 thread->register_stack_base(),
2520 thread->register_stack_base() + thread->stack_size());
2521 }
2522
2523 // Reguard the permanent register stack red zone just to be sure.
2524 // We saw Windows silently disabling this without telling us.
2525 thread->enable_register_stack_red_zone();
2526
2527 return Handle_Exception(exceptionInfo,
2528 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2529 }
2530 #endif
2531 if (thread->stack_yellow_zone_enabled()) {
2532 // Yellow zone violation. The o/s has unprotected the first yellow
2533 // zone page for us. Note: must call disable_stack_yellow_zone to
2534 // update the enabled status, even if the zone contains only one page.
2535 thread->disable_stack_yellow_zone();
2536 // If not in java code, return and hope for the best.
2537 return in_java
2538 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2539 : EXCEPTION_CONTINUE_EXECUTION;
2540 } else {
2541 // Fatal red zone violation.
2542 thread->disable_stack_red_zone();
2543 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2544 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2545 exceptionInfo->ContextRecord);
2546 return EXCEPTION_CONTINUE_SEARCH;
2547 }
2548 } else if (in_java) {
2549 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2550 // a one-time-only guard page, which it has released to us. The next
2551 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2552 return Handle_Exception(exceptionInfo,
2553 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2554 } else {
2555 // Can only return and hope for the best. Further stack growth will
2556 // result in an ACCESS_VIOLATION.
2557 return EXCEPTION_CONTINUE_EXECUTION;
2558 }
2559 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2560 // Either stack overflow or null pointer exception.
2561 if (in_java) {
2562 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2563 address addr = (address) exceptionRecord->ExceptionInformation[1];
2564 address stack_end = thread->stack_base() - thread->stack_size();
2565 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2566 // Stack overflow.
2567 assert(!os::uses_stack_guard_pages(),
2568 "should be caught by red zone code above.");
2569 return Handle_Exception(exceptionInfo,
2570 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2571 }
2572 // Check for safepoint polling and implicit null
2573 // We only expect null pointers in the stubs (vtable)
2574 // the rest are checked explicitly now.
2575 CodeBlob* cb = CodeCache::find_blob(pc);
2576 if (cb != NULL) {
2577 if (os::is_poll_address(addr)) {
2578 address stub = SharedRuntime::get_poll_stub(pc);
2579 return Handle_Exception(exceptionInfo, stub);
2580 }
2581 }
2582 {
2583 #ifdef _WIN64
2584 // If it's a legal stack address map the entire region in
2585 //
2586 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2587 address addr = (address) exceptionRecord->ExceptionInformation[1];
2588 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base()) {
2589 addr = (address)((uintptr_t)addr &
2590 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2591 os::commit_memory((char *)addr, thread->stack_base() - addr,
2592 !ExecMem);
2593 return EXCEPTION_CONTINUE_EXECUTION;
2594 } else
2595 #endif
2596 {
2597 // Null pointer exception.
2598 #ifdef _M_IA64
2599 // Process implicit null checks in compiled code. Note: Implicit null checks
2600 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2601 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2602 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2603 // Handle implicit null check in UEP method entry
2604 if (cb && (cb->is_frame_complete_at(pc) ||
2605 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2606 if (Verbose) {
2607 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2608 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2609 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2610 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2611 *(bundle_start + 1), *bundle_start);
2612 }
2613 return Handle_Exception(exceptionInfo,
2614 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2615 }
2616 }
2617
2618 // Implicit null checks were processed above. Hence, we should not reach
2619 // here in the usual case => die!
2620 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2621 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2622 exceptionInfo->ContextRecord);
2623 return EXCEPTION_CONTINUE_SEARCH;
2624
2625 #else // !IA64
2626
2627 // Windows 98 reports faulting addresses incorrectly
2628 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2629 !os::win32::is_nt()) {
2630 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2631 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2632 }
2633 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2634 exceptionInfo->ContextRecord);
2635 return EXCEPTION_CONTINUE_SEARCH;
2636 #endif
2637 }
2638 }
2639 }
2640
2641 #ifdef _WIN64
2642 // Special care for fast JNI field accessors.
2643 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2644 // in and the heap gets shrunk before the field access.
2645 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2646 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2647 if (addr != (address)-1) {
2648 return Handle_Exception(exceptionInfo, addr);
2649 }
2650 }
2651 #endif
2652
2653 // Stack overflow or null pointer exception in native code.
2654 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2655 exceptionInfo->ContextRecord);
2656 return EXCEPTION_CONTINUE_SEARCH;
2657 } // /EXCEPTION_ACCESS_VIOLATION
2658 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2659 #if defined _M_IA64
2660 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2661 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2662 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2663
2664 // Compiled method patched to be non entrant? Following conditions must apply:
2665 // 1. must be first instruction in bundle
2666 // 2. must be a break instruction with appropriate code
2667 if ((((uint64_t) pc & 0x0F) == 0) &&
2668 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2669 return Handle_Exception(exceptionInfo,
2670 (address)SharedRuntime::get_handle_wrong_method_stub());
2671 }
2672 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2673 #endif
2674
2675
2676 if (in_java) {
2677 switch (exception_code) {
2678 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2679 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2680
2681 case EXCEPTION_INT_OVERFLOW:
2682 return Handle_IDiv_Exception(exceptionInfo);
2683
2684 } // switch
2685 }
2686 if (((thread->thread_state() == _thread_in_Java) ||
2687 (thread->thread_state() == _thread_in_native)) &&
2688 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2689 LONG result=Handle_FLT_Exception(exceptionInfo);
2690 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2691 }
2692 }
2693
2694 if (exception_code != EXCEPTION_BREAKPOINT) {
2695 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2696 exceptionInfo->ContextRecord);
2697 }
2698 return EXCEPTION_CONTINUE_SEARCH;
2699 }
2700
2701 #ifndef _WIN64
2702 // Special care for fast JNI accessors.
2703 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2704 // the heap gets shrunk before the field access.
2705 // Need to install our own structured exception handler since native code may
2706 // install its own.
2707 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2708 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2709 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2710 address pc = (address) exceptionInfo->ContextRecord->Eip;
2711 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2712 if (addr != (address)-1) {
2713 return Handle_Exception(exceptionInfo, addr);
2714 }
2715 }
2716 return EXCEPTION_CONTINUE_SEARCH;
2717 }
2718
2719 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2720 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2721 jobject obj, \
2722 jfieldID fieldID) { \
2723 __try { \
2724 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2725 obj, \
2726 fieldID); \
2727 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2728 _exception_info())) { \
2729 } \
2730 return 0; \
2731 }
2732
2733 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2734 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2735 DEFINE_FAST_GETFIELD(jchar, char, Char)
2736 DEFINE_FAST_GETFIELD(jshort, short, Short)
2737 DEFINE_FAST_GETFIELD(jint, int, Int)
2738 DEFINE_FAST_GETFIELD(jlong, long, Long)
2739 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2740 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2741
2742 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2743 switch (type) {
2744 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2745 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2746 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2747 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2748 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2749 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2750 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2751 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2752 default: ShouldNotReachHere();
2753 }
2754 return (address)-1;
2755 }
2756 #endif
2757
2758 // Virtual Memory
2759
2760 int os::vm_page_size() { return os::win32::vm_page_size(); }
2761 int os::vm_allocation_granularity() {
2762 return os::win32::vm_allocation_granularity();
2763 }
2764
2765 // Windows large page support is available on Windows 2003. In order to use
2766 // large page memory, the administrator must first assign additional privilege
2767 // to the user:
2768 // + select Control Panel -> Administrative Tools -> Local Security Policy
2769 // + select Local Policies -> User Rights Assignment
2770 // + double click "Lock pages in memory", add users and/or groups
2771 // + reboot
2772 // Note the above steps are needed for administrator as well, as administrators
2773 // by default do not have the privilege to lock pages in memory.
2774 //
2775 // Note about Windows 2003: although the API supports committing large page
2776 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2777 // scenario, I found through experiment it only uses large page if the entire
2778 // memory region is reserved and committed in a single VirtualAlloc() call.
2779 // This makes Windows large page support more or less like Solaris ISM, in
2780 // that the entire heap must be committed upfront. This probably will change
2781 // in the future, if so the code below needs to be revisited.
2782
2783 #ifndef MEM_LARGE_PAGES
2784 #define MEM_LARGE_PAGES 0x20000000
2785 #endif
2786
2787 static HANDLE _hProcess;
2788 static HANDLE _hToken;
2789
2790 // Container for NUMA node list info
2791 class NUMANodeListHolder {
2792 private:
2793 int *_numa_used_node_list; // allocated below
2794 int _numa_used_node_count;
2795
2796 void free_node_list() {
2797 if (_numa_used_node_list != NULL) {
2798 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2799 }
2800 }
2801
2802 public:
2803 NUMANodeListHolder() {
2804 _numa_used_node_count = 0;
2805 _numa_used_node_list = NULL;
2806 // do rest of initialization in build routine (after function pointers are set up)
2807 }
2808
2809 ~NUMANodeListHolder() {
2810 free_node_list();
2811 }
2812
2813 bool build() {
2814 DWORD_PTR proc_aff_mask;
2815 DWORD_PTR sys_aff_mask;
2816 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2817 ULONG highest_node_number;
2818 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2819 free_node_list();
2820 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2821 for (unsigned int i = 0; i <= highest_node_number; i++) {
2822 ULONGLONG proc_mask_numa_node;
2823 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2824 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2825 _numa_used_node_list[_numa_used_node_count++] = i;
2826 }
2827 }
2828 return (_numa_used_node_count > 1);
2829 }
2830
2831 int get_count() { return _numa_used_node_count; }
2832 int get_node_list_entry(int n) {
2833 // for indexes out of range, returns -1
2834 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2835 }
2836
2837 } numa_node_list_holder;
2838
2839
2840
2841 static size_t _large_page_size = 0;
2842
2843 static bool resolve_functions_for_large_page_init() {
2844 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2845 os::Advapi32Dll::AdvapiAvailable();
2846 }
2847
2848 static bool request_lock_memory_privilege() {
2849 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2850 os::current_process_id());
2851
2852 LUID luid;
2853 if (_hProcess != NULL &&
2854 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2855 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2856
2857 TOKEN_PRIVILEGES tp;
2858 tp.PrivilegeCount = 1;
2859 tp.Privileges[0].Luid = luid;
2860 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2861
2862 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2863 // privilege. Check GetLastError() too. See MSDN document.
2864 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2865 (GetLastError() == ERROR_SUCCESS)) {
2866 return true;
2867 }
2868 }
2869
2870 return false;
2871 }
2872
2873 static void cleanup_after_large_page_init() {
2874 if (_hProcess) CloseHandle(_hProcess);
2875 _hProcess = NULL;
2876 if (_hToken) CloseHandle(_hToken);
2877 _hToken = NULL;
2878 }
2879
2880 static bool numa_interleaving_init() {
2881 bool success = false;
2882 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2883
2884 // print a warning if UseNUMAInterleaving flag is specified on command line
2885 bool warn_on_failure = use_numa_interleaving_specified;
2886 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2887
2888 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2889 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2890 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2891
2892 if (os::Kernel32Dll::NumaCallsAvailable()) {
2893 if (numa_node_list_holder.build()) {
2894 if (PrintMiscellaneous && Verbose) {
2895 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2896 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2897 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2898 }
2899 tty->print("\n");
2900 }
2901 success = true;
2902 } else {
2903 WARN("Process does not cover multiple NUMA nodes.");
2904 }
2905 } else {
2906 WARN("NUMA Interleaving is not supported by the operating system.");
2907 }
2908 if (!success) {
2909 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2910 }
2911 return success;
2912 #undef WARN
2913 }
2914
2915 // this routine is used whenever we need to reserve a contiguous VA range
2916 // but we need to make separate VirtualAlloc calls for each piece of the range
2917 // Reasons for doing this:
2918 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2919 // * UseNUMAInterleaving requires a separate node for each piece
2920 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2921 DWORD prot,
2922 bool should_inject_error = false) {
2923 char * p_buf;
2924 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2925 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2926 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2927
2928 // first reserve enough address space in advance since we want to be
2929 // able to break a single contiguous virtual address range into multiple
2930 // large page commits but WS2003 does not allow reserving large page space
2931 // so we just use 4K pages for reserve, this gives us a legal contiguous
2932 // address space. then we will deallocate that reservation, and re alloc
2933 // using large pages
2934 const size_t size_of_reserve = bytes + chunk_size;
2935 if (bytes > size_of_reserve) {
2936 // Overflowed.
2937 return NULL;
2938 }
2939 p_buf = (char *) VirtualAlloc(addr,
2940 size_of_reserve, // size of Reserve
2941 MEM_RESERVE,
2942 PAGE_READWRITE);
2943 // If reservation failed, return NULL
2944 if (p_buf == NULL) return NULL;
2945 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2946 os::release_memory(p_buf, bytes + chunk_size);
2947
2948 // we still need to round up to a page boundary (in case we are using large pages)
2949 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2950 // instead we handle this in the bytes_to_rq computation below
2951 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2952
2953 // now go through and allocate one chunk at a time until all bytes are
2954 // allocated
2955 size_t bytes_remaining = bytes;
2956 // An overflow of align_size_up() would have been caught above
2957 // in the calculation of size_of_reserve.
2958 char * next_alloc_addr = p_buf;
2959 HANDLE hProc = GetCurrentProcess();
2960
2961 #ifdef ASSERT
2962 // Variable for the failure injection
2963 long ran_num = os::random();
2964 size_t fail_after = ran_num % bytes;
2965 #endif
2966
2967 int count=0;
2968 while (bytes_remaining) {
2969 // select bytes_to_rq to get to the next chunk_size boundary
2970
2971 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2972 // Note allocate and commit
2973 char * p_new;
2974
2975 #ifdef ASSERT
2976 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2977 #else
2978 const bool inject_error_now = false;
2979 #endif
2980
2981 if (inject_error_now) {
2982 p_new = NULL;
2983 } else {
2984 if (!UseNUMAInterleaving) {
2985 p_new = (char *) VirtualAlloc(next_alloc_addr,
2986 bytes_to_rq,
2987 flags,
2988 prot);
2989 } else {
2990 // get the next node to use from the used_node_list
2991 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2992 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2993 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2994 next_alloc_addr,
2995 bytes_to_rq,
2996 flags,
2997 prot,
2998 node);
2999 }
3000 }
3001
3002 if (p_new == NULL) {
3003 // Free any allocated pages
3004 if (next_alloc_addr > p_buf) {
3005 // Some memory was committed so release it.
3006 size_t bytes_to_release = bytes - bytes_remaining;
3007 // NMT has yet to record any individual blocks, so it
3008 // need to create a dummy 'reserve' record to match
3009 // the release.
3010 MemTracker::record_virtual_memory_reserve((address)p_buf,
3011 bytes_to_release, CALLER_PC);
3012 os::release_memory(p_buf, bytes_to_release);
3013 }
3014 #ifdef ASSERT
3015 if (should_inject_error) {
3016 if (TracePageSizes && Verbose) {
3017 tty->print_cr("Reserving pages individually failed.");
3018 }
3019 }
3020 #endif
3021 return NULL;
3022 }
3023
3024 bytes_remaining -= bytes_to_rq;
3025 next_alloc_addr += bytes_to_rq;
3026 count++;
3027 }
3028 // Although the memory is allocated individually, it is returned as one.
3029 // NMT records it as one block.
3030 if ((flags & MEM_COMMIT) != 0) {
3031 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3032 } else {
3033 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3034 }
3035
3036 // made it this far, success
3037 return p_buf;
3038 }
3039
3040
3041
3042 void os::large_page_init() {
3043 if (!UseLargePages) return;
3044
3045 // print a warning if any large page related flag is specified on command line
3046 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3047 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3048 bool success = false;
3049
3050 #define WARN(msg) if (warn_on_failure) { warning(msg); }
3051 if (resolve_functions_for_large_page_init()) {
3052 if (request_lock_memory_privilege()) {
3053 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3054 if (s) {
3055 #if defined(IA32) || defined(AMD64)
3056 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3057 WARN("JVM cannot use large pages bigger than 4mb.");
3058 } else {
3059 #endif
3060 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3061 _large_page_size = LargePageSizeInBytes;
3062 } else {
3063 _large_page_size = s;
3064 }
3065 success = true;
3066 #if defined(IA32) || defined(AMD64)
3067 }
3068 #endif
3069 } else {
3070 WARN("Large page is not supported by the processor.");
3071 }
3072 } else {
3073 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3074 }
3075 } else {
3076 WARN("Large page is not supported by the operating system.");
3077 }
3078 #undef WARN
3079
3080 const size_t default_page_size = (size_t) vm_page_size();
3081 if (success && _large_page_size > default_page_size) {
3082 _page_sizes[0] = _large_page_size;
3083 _page_sizes[1] = default_page_size;
3084 _page_sizes[2] = 0;
3085 }
3086
3087 cleanup_after_large_page_init();
3088 UseLargePages = success;
3089 }
3090
3091 // On win32, one cannot release just a part of reserved memory, it's an
3092 // all or nothing deal. When we split a reservation, we must break the
3093 // reservation into two reservations.
3094 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3095 bool realloc) {
3096 if (size > 0) {
3097 release_memory(base, size);
3098 if (realloc) {
3099 reserve_memory(split, base);
3100 }
3101 if (size != split) {
3102 reserve_memory(size - split, base + split);
3103 }
3104 }
3105 }
3106
3107 // Multiple threads can race in this code but it's not possible to unmap small sections of
3108 // virtual space to get requested alignment, like posix-like os's.
3109 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3110 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3111 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3112 "Alignment must be a multiple of allocation granularity (page size)");
3113 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3114
3115 size_t extra_size = size + alignment;
3116 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3117
3118 char* aligned_base = NULL;
3119
3120 do {
3121 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3122 if (extra_base == NULL) {
3123 return NULL;
3124 }
3125 // Do manual alignment
3126 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3127
3128 os::release_memory(extra_base, extra_size);
3129
3130 aligned_base = os::reserve_memory(size, aligned_base);
3131
3132 } while (aligned_base == NULL);
3133
3134 return aligned_base;
3135 }
3136
3137 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3138 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3139 "reserve alignment");
3140 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3141 char* res;
3142 // note that if UseLargePages is on, all the areas that require interleaving
3143 // will go thru reserve_memory_special rather than thru here.
3144 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3145 if (!use_individual) {
3146 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3147 } else {
3148 elapsedTimer reserveTimer;
3149 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3150 // in numa interleaving, we have to allocate pages individually
3151 // (well really chunks of NUMAInterleaveGranularity size)
3152 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3153 if (res == NULL) {
3154 warning("NUMA page allocation failed");
3155 }
3156 if (Verbose && PrintMiscellaneous) {
3157 reserveTimer.stop();
3158 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3159 reserveTimer.milliseconds(), reserveTimer.ticks());
3160 }
3161 }
3162 assert(res == NULL || addr == NULL || addr == res,
3163 "Unexpected address from reserve.");
3164
3165 return res;
3166 }
3167
3168 // Reserve memory at an arbitrary address, only if that area is
3169 // available (and not reserved for something else).
3170 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3171 // Windows os::reserve_memory() fails of the requested address range is
3172 // not avilable.
3173 return reserve_memory(bytes, requested_addr);
3174 }
3175
3176 size_t os::large_page_size() {
3177 return _large_page_size;
3178 }
3179
3180 bool os::can_commit_large_page_memory() {
3181 // Windows only uses large page memory when the entire region is reserved
3182 // and committed in a single VirtualAlloc() call. This may change in the
3183 // future, but with Windows 2003 it's not possible to commit on demand.
3184 return false;
3185 }
3186
3187 bool os::can_execute_large_page_memory() {
3188 return true;
3189 }
3190
3191 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3192 bool exec) {
3193 assert(UseLargePages, "only for large pages");
3194
3195 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3196 return NULL; // Fallback to small pages.
3197 }
3198
3199 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3200 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3201
3202 // with large pages, there are two cases where we need to use Individual Allocation
3203 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3204 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3205 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3206 if (TracePageSizes && Verbose) {
3207 tty->print_cr("Reserving large pages individually.");
3208 }
3209 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3210 if (p_buf == NULL) {
3211 // give an appropriate warning message
3212 if (UseNUMAInterleaving) {
3213 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3214 }
3215 if (UseLargePagesIndividualAllocation) {
3216 warning("Individually allocated large pages failed, "
3217 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3218 }
3219 return NULL;
3220 }
3221
3222 return p_buf;
3223
3224 } else {
3225 if (TracePageSizes && Verbose) {
3226 tty->print_cr("Reserving large pages in a single large chunk.");
3227 }
3228 // normal policy just allocate it all at once
3229 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3230 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3231 if (res != NULL) {
3232 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3233 }
3234
3235 return res;
3236 }
3237 }
3238
3239 bool os::release_memory_special(char* base, size_t bytes) {
3240 assert(base != NULL, "Sanity check");
3241 return release_memory(base, bytes);
3242 }
3243
3244 void os::print_statistics() {
3245 }
3246
3247 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3248 int err = os::get_last_error();
3249 char buf[256];
3250 size_t buf_len = os::lasterror(buf, sizeof(buf));
3251 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3252 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3253 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3254 }
3255
3256 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3257 if (bytes == 0) {
3258 // Don't bother the OS with noops.
3259 return true;
3260 }
3261 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3262 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3263 // Don't attempt to print anything if the OS call fails. We're
3264 // probably low on resources, so the print itself may cause crashes.
3265
3266 // unless we have NUMAInterleaving enabled, the range of a commit
3267 // is always within a reserve covered by a single VirtualAlloc
3268 // in that case we can just do a single commit for the requested size
3269 if (!UseNUMAInterleaving) {
3270 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3271 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3272 return false;
3273 }
3274 if (exec) {
3275 DWORD oldprot;
3276 // Windows doc says to use VirtualProtect to get execute permissions
3277 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3278 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3279 return false;
3280 }
3281 }
3282 return true;
3283 } else {
3284
3285 // when NUMAInterleaving is enabled, the commit might cover a range that
3286 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3287 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3288 // returns represents the number of bytes that can be committed in one step.
3289 size_t bytes_remaining = bytes;
3290 char * next_alloc_addr = addr;
3291 while (bytes_remaining > 0) {
3292 MEMORY_BASIC_INFORMATION alloc_info;
3293 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3294 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3295 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3296 PAGE_READWRITE) == NULL) {
3297 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3298 exec);)
3299 return false;
3300 }
3301 if (exec) {
3302 DWORD oldprot;
3303 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3304 PAGE_EXECUTE_READWRITE, &oldprot)) {
3305 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3306 exec);)
3307 return false;
3308 }
3309 }
3310 bytes_remaining -= bytes_to_rq;
3311 next_alloc_addr += bytes_to_rq;
3312 }
3313 }
3314 // if we made it this far, return true
3315 return true;
3316 }
3317
3318 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3319 bool exec) {
3320 // alignment_hint is ignored on this OS
3321 return pd_commit_memory(addr, size, exec);
3322 }
3323
3324 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3325 const char* mesg) {
3326 assert(mesg != NULL, "mesg must be specified");
3327 if (!pd_commit_memory(addr, size, exec)) {
3328 warn_fail_commit_memory(addr, size, exec);
3329 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3330 }
3331 }
3332
3333 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3334 size_t alignment_hint, bool exec,
3335 const char* mesg) {
3336 // alignment_hint is ignored on this OS
3337 pd_commit_memory_or_exit(addr, size, exec, mesg);
3338 }
3339
3340 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3341 if (bytes == 0) {
3342 // Don't bother the OS with noops.
3343 return true;
3344 }
3345 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3346 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3347 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3348 }
3349
3350 bool os::pd_release_memory(char* addr, size_t bytes) {
3351 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3352 }
3353
3354 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3355 return os::commit_memory(addr, size, !ExecMem);
3356 }
3357
3358 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3359 return os::uncommit_memory(addr, size);
3360 }
3361
3362 // Set protections specified
3363 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3364 bool is_committed) {
3365 unsigned int p = 0;
3366 switch (prot) {
3367 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3368 case MEM_PROT_READ: p = PAGE_READONLY; break;
3369 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3370 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3371 default:
3372 ShouldNotReachHere();
3373 }
3374
3375 DWORD old_status;
3376
3377 // Strange enough, but on Win32 one can change protection only for committed
3378 // memory, not a big deal anyway, as bytes less or equal than 64K
3379 if (!is_committed) {
3380 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3381 "cannot commit protection page");
3382 }
3383 // One cannot use os::guard_memory() here, as on Win32 guard page
3384 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3385 //
3386 // Pages in the region become guard pages. Any attempt to access a guard page
3387 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3388 // the guard page status. Guard pages thus act as a one-time access alarm.
3389 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3390 }
3391
3392 bool os::guard_memory(char* addr, size_t bytes) {
3393 DWORD old_status;
3394 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3395 }
3396
3397 bool os::unguard_memory(char* addr, size_t bytes) {
3398 DWORD old_status;
3399 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3400 }
3401
3402 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3403 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3404 void os::numa_make_global(char *addr, size_t bytes) { }
3405 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3406 bool os::numa_topology_changed() { return false; }
3407 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3408 int os::numa_get_group_id() { return 0; }
3409 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3410 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3411 // Provide an answer for UMA systems
3412 ids[0] = 0;
3413 return 1;
3414 } else {
3415 // check for size bigger than actual groups_num
3416 size = MIN2(size, numa_get_groups_num());
3417 for (int i = 0; i < (int)size; i++) {
3418 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3419 }
3420 return size;
3421 }
3422 }
3423
3424 bool os::get_page_info(char *start, page_info* info) {
3425 return false;
3426 }
3427
3428 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3429 page_info* page_found) {
3430 return end;
3431 }
3432
3433 char* os::non_memory_address_word() {
3434 // Must never look like an address returned by reserve_memory,
3435 // even in its subfields (as defined by the CPU immediate fields,
3436 // if the CPU splits constants across multiple instructions).
3437 return (char*)-1;
3438 }
3439
3440 #define MAX_ERROR_COUNT 100
3441 #define SYS_THREAD_ERROR 0xffffffffUL
3442
3443 void os::pd_start_thread(Thread* thread) {
3444 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3445 // Returns previous suspend state:
3446 // 0: Thread was not suspended
3447 // 1: Thread is running now
3448 // >1: Thread is still suspended.
3449 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3450 }
3451
3452 class HighResolutionInterval : public CHeapObj<mtThread> {
3453 // The default timer resolution seems to be 10 milliseconds.
3454 // (Where is this written down?)
3455 // If someone wants to sleep for only a fraction of the default,
3456 // then we set the timer resolution down to 1 millisecond for
3457 // the duration of their interval.
3458 // We carefully set the resolution back, since otherwise we
3459 // seem to incur an overhead (3%?) that we don't need.
3460 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3461 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3462 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3463 // timeBeginPeriod() if the relative error exceeded some threshold.
3464 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3465 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3466 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3467 // resolution timers running.
3468 private:
3469 jlong resolution;
3470 public:
3471 HighResolutionInterval(jlong ms) {
3472 resolution = ms % 10L;
3473 if (resolution != 0) {
3474 MMRESULT result = timeBeginPeriod(1L);
3475 }
3476 }
3477 ~HighResolutionInterval() {
3478 if (resolution != 0) {
3479 MMRESULT result = timeEndPeriod(1L);
3480 }
3481 resolution = 0L;
3482 }
3483 };
3484
3485 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3486 jlong limit = (jlong) MAXDWORD;
3487
3488 while (ms > limit) {
3489 int res;
3490 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3491 return res;
3492 }
3493 ms -= limit;
3494 }
3495
3496 assert(thread == Thread::current(), "thread consistency check");
3497 OSThread* osthread = thread->osthread();
3498 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3499 int result;
3500 if (interruptable) {
3501 assert(thread->is_Java_thread(), "must be java thread");
3502 JavaThread *jt = (JavaThread *) thread;
3503 ThreadBlockInVM tbivm(jt);
3504
3505 jt->set_suspend_equivalent();
3506 // cleared by handle_special_suspend_equivalent_condition() or
3507 // java_suspend_self() via check_and_wait_while_suspended()
3508
3509 HANDLE events[1];
3510 events[0] = osthread->interrupt_event();
3511 HighResolutionInterval *phri=NULL;
3512 if (!ForceTimeHighResolution) {
3513 phri = new HighResolutionInterval(ms);
3514 }
3515 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3516 result = OS_TIMEOUT;
3517 } else {
3518 ResetEvent(osthread->interrupt_event());
3519 osthread->set_interrupted(false);
3520 result = OS_INTRPT;
3521 }
3522 delete phri; //if it is NULL, harmless
3523
3524 // were we externally suspended while we were waiting?
3525 jt->check_and_wait_while_suspended();
3526 } else {
3527 assert(!thread->is_Java_thread(), "must not be java thread");
3528 Sleep((long) ms);
3529 result = OS_TIMEOUT;
3530 }
3531 return result;
3532 }
3533
3534 // Short sleep, direct OS call.
3535 //
3536 // ms = 0, means allow others (if any) to run.
3537 //
3538 void os::naked_short_sleep(jlong ms) {
3539 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3540 Sleep(ms);
3541 }
3542
3543 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3544 void os::infinite_sleep() {
3545 while (true) { // sleep forever ...
3546 Sleep(100000); // ... 100 seconds at a time
3547 }
3548 }
3549
3550 typedef BOOL (WINAPI * STTSignature)(void);
3551
3552 void os::naked_yield() {
3553 // Use either SwitchToThread() or Sleep(0)
3554 // Consider passing back the return value from SwitchToThread().
3555 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3556 SwitchToThread();
3557 } else {
3558 Sleep(0);
3559 }
3560 }
3561
3562 // Win32 only gives you access to seven real priorities at a time,
3563 // so we compress Java's ten down to seven. It would be better
3564 // if we dynamically adjusted relative priorities.
3565
3566 int os::java_to_os_priority[CriticalPriority + 1] = {
3567 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3568 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3569 THREAD_PRIORITY_LOWEST, // 2
3570 THREAD_PRIORITY_BELOW_NORMAL, // 3
3571 THREAD_PRIORITY_BELOW_NORMAL, // 4
3572 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3573 THREAD_PRIORITY_NORMAL, // 6
3574 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3575 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3576 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3577 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3578 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3579 };
3580
3581 int prio_policy1[CriticalPriority + 1] = {
3582 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3583 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3584 THREAD_PRIORITY_LOWEST, // 2
3585 THREAD_PRIORITY_BELOW_NORMAL, // 3
3586 THREAD_PRIORITY_BELOW_NORMAL, // 4
3587 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3588 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3589 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3590 THREAD_PRIORITY_HIGHEST, // 8
3591 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3592 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3593 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3594 };
3595
3596 static int prio_init() {
3597 // If ThreadPriorityPolicy is 1, switch tables
3598 if (ThreadPriorityPolicy == 1) {
3599 int i;
3600 for (i = 0; i < CriticalPriority + 1; i++) {
3601 os::java_to_os_priority[i] = prio_policy1[i];
3602 }
3603 }
3604 if (UseCriticalJavaThreadPriority) {
3605 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3606 }
3607 return 0;
3608 }
3609
3610 OSReturn os::set_native_priority(Thread* thread, int priority) {
3611 if (!UseThreadPriorities) return OS_OK;
3612 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3613 return ret ? OS_OK : OS_ERR;
3614 }
3615
3616 OSReturn os::get_native_priority(const Thread* const thread,
3617 int* priority_ptr) {
3618 if (!UseThreadPriorities) {
3619 *priority_ptr = java_to_os_priority[NormPriority];
3620 return OS_OK;
3621 }
3622 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3623 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3624 assert(false, "GetThreadPriority failed");
3625 return OS_ERR;
3626 }
3627 *priority_ptr = os_prio;
3628 return OS_OK;
3629 }
3630
3631
3632 // Hint to the underlying OS that a task switch would not be good.
3633 // Void return because it's a hint and can fail.
3634 void os::hint_no_preempt() {}
3635
3636 void os::interrupt(Thread* thread) {
3637 assert(!thread->is_Java_thread() || Thread::current() == thread ||
3638 Threads_lock->owned_by_self(),
3639 "possibility of dangling Thread pointer");
3640
3641 OSThread* osthread = thread->osthread();
3642 osthread->set_interrupted(true);
3643 // More than one thread can get here with the same value of osthread,
3644 // resulting in multiple notifications. We do, however, want the store
3645 // to interrupted() to be visible to other threads before we post
3646 // the interrupt event.
3647 OrderAccess::release();
3648 SetEvent(osthread->interrupt_event());
3649 // For JSR166: unpark after setting status
3650 if (thread->is_Java_thread()) {
3651 ((JavaThread*)thread)->parker()->unpark();
3652 }
3653
3654 ParkEvent * ev = thread->_ParkEvent;
3655 if (ev != NULL) ev->unpark();
3656 }
3657
3658
3659 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3660 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3661 "possibility of dangling Thread pointer");
3662
3663 OSThread* osthread = thread->osthread();
3664 // There is no synchronization between the setting of the interrupt
3665 // and it being cleared here. It is critical - see 6535709 - that
3666 // we only clear the interrupt state, and reset the interrupt event,
3667 // if we are going to report that we were indeed interrupted - else
3668 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3669 // depending on the timing. By checking thread interrupt event to see
3670 // if the thread gets real interrupt thus prevent spurious wakeup.
3671 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3672 if (interrupted && clear_interrupted) {
3673 osthread->set_interrupted(false);
3674 ResetEvent(osthread->interrupt_event());
3675 } // Otherwise leave the interrupted state alone
3676
3677 return interrupted;
3678 }
3679
3680 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3681 ExtendedPC os::get_thread_pc(Thread* thread) {
3682 CONTEXT context;
3683 context.ContextFlags = CONTEXT_CONTROL;
3684 HANDLE handle = thread->osthread()->thread_handle();
3685 #ifdef _M_IA64
3686 assert(0, "Fix get_thread_pc");
3687 return ExtendedPC(NULL);
3688 #else
3689 if (GetThreadContext(handle, &context)) {
3690 #ifdef _M_AMD64
3691 return ExtendedPC((address) context.Rip);
3692 #else
3693 return ExtendedPC((address) context.Eip);
3694 #endif
3695 } else {
3696 return ExtendedPC(NULL);
3697 }
3698 #endif
3699 }
3700
3701 // GetCurrentThreadId() returns DWORD
3702 intx os::current_thread_id() { return GetCurrentThreadId(); }
3703
3704 static int _initial_pid = 0;
3705
3706 int os::current_process_id() {
3707 return (_initial_pid ? _initial_pid : _getpid());
3708 }
3709
3710 int os::win32::_vm_page_size = 0;
3711 int os::win32::_vm_allocation_granularity = 0;
3712 int os::win32::_processor_type = 0;
3713 // Processor level is not available on non-NT systems, use vm_version instead
3714 int os::win32::_processor_level = 0;
3715 julong os::win32::_physical_memory = 0;
3716 size_t os::win32::_default_stack_size = 0;
3717
3718 intx os::win32::_os_thread_limit = 0;
3719 volatile intx os::win32::_os_thread_count = 0;
3720
3721 bool os::win32::_is_nt = false;
3722 bool os::win32::_is_windows_2003 = false;
3723 bool os::win32::_is_windows_server = false;
3724
3725 // 6573254
3726 // Currently, the bug is observed across all the supported Windows releases,
3727 // including the latest one (as of this writing - Windows Server 2012 R2)
3728 bool os::win32::_has_exit_bug = true;
3729 bool os::win32::_has_performance_count = 0;
3730
3731 void os::win32::initialize_system_info() {
3732 SYSTEM_INFO si;
3733 GetSystemInfo(&si);
3734 _vm_page_size = si.dwPageSize;
3735 _vm_allocation_granularity = si.dwAllocationGranularity;
3736 _processor_type = si.dwProcessorType;
3737 _processor_level = si.wProcessorLevel;
3738 set_processor_count(si.dwNumberOfProcessors);
3739
3740 MEMORYSTATUSEX ms;
3741 ms.dwLength = sizeof(ms);
3742
3743 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3744 // dwMemoryLoad (% of memory in use)
3745 GlobalMemoryStatusEx(&ms);
3746 _physical_memory = ms.ullTotalPhys;
3747
3748 OSVERSIONINFOEX oi;
3749 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3750 GetVersionEx((OSVERSIONINFO*)&oi);
3751 switch (oi.dwPlatformId) {
3752 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3753 case VER_PLATFORM_WIN32_NT:
3754 _is_nt = true;
3755 {
3756 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3757 if (os_vers == 5002) {
3758 _is_windows_2003 = true;
3759 }
3760 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3761 oi.wProductType == VER_NT_SERVER) {
3762 _is_windows_server = true;
3763 }
3764 }
3765 break;
3766 default: fatal("Unknown platform");
3767 }
3768
3769 _default_stack_size = os::current_stack_size();
3770 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3771 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3772 "stack size not a multiple of page size");
3773
3774 initialize_performance_counter();
3775 }
3776
3777
3778 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3779 int ebuflen) {
3780 char path[MAX_PATH];
3781 DWORD size;
3782 DWORD pathLen = (DWORD)sizeof(path);
3783 HINSTANCE result = NULL;
3784
3785 // only allow library name without path component
3786 assert(strchr(name, '\\') == NULL, "path not allowed");
3787 assert(strchr(name, ':') == NULL, "path not allowed");
3788 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3789 jio_snprintf(ebuf, ebuflen,
3790 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3791 return NULL;
3792 }
3793
3794 // search system directory
3795 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3796 if (size >= pathLen) {
3797 return NULL; // truncated
3798 }
3799 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3800 return NULL; // truncated
3801 }
3802 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3803 return result;
3804 }
3805 }
3806
3807 // try Windows directory
3808 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3809 if (size >= pathLen) {
3810 return NULL; // truncated
3811 }
3812 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3813 return NULL; // truncated
3814 }
3815 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3816 return result;
3817 }
3818 }
3819
3820 jio_snprintf(ebuf, ebuflen,
3821 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3822 return NULL;
3823 }
3824
3825 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3826
3827 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3828 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3829 return TRUE;
3830 }
3831
3832 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3833 // Basic approach:
3834 // - Each exiting thread registers its intent to exit and then does so.
3835 // - A thread trying to terminate the process must wait for all
3836 // threads currently exiting to complete their exit.
3837
3838 if (os::win32::has_exit_bug()) {
3839 // The array holds handles of the threads that have started exiting by calling
3840 // _endthreadex().
3841 // Should be large enough to avoid blocking the exiting thread due to lack of
3842 // a free slot.
3843 static HANDLE handles[MAXIMUM_WAIT_OBJECTS];
3844 static int handle_count = 0;
3845
3846 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3847 static CRITICAL_SECTION crit_sect;
3848 static volatile jint process_exiting = 0;
3849 int i, j;
3850 DWORD res;
3851 HANDLE hproc, hthr;
3852
3853 // The first thread that reached this point, initializes the critical section.
3854 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3855 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3856 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3857 EnterCriticalSection(&crit_sect);
3858
3859 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3860 // Remove from the array those handles of the threads that have completed exiting.
3861 for (i = 0, j = 0; i < handle_count; ++i) {
3862 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3863 if (res == WAIT_TIMEOUT) {
3864 handles[j++] = handles[i];
3865 } else {
3866 if (res == WAIT_FAILED) {
3867 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3868 GetLastError(), __FILE__, __LINE__);
3869 }
3870 // Don't keep the handle, if we failed waiting for it.
3871 CloseHandle(handles[i]);
3872 }
3873 }
3874
3875 // If there's no free slot in the array of the kept handles, we'll have to
3876 // wait until at least one thread completes exiting.
3877 if ((handle_count = j) == MAXIMUM_WAIT_OBJECTS) {
3878 // Raise the priority of the oldest exiting thread to increase its chances
3879 // to complete sooner.
3880 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3881 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3882 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3883 i = (res - WAIT_OBJECT_0);
3884 handle_count = MAXIMUM_WAIT_OBJECTS - 1;
3885 for (; i < handle_count; ++i) {
3886 handles[i] = handles[i + 1];
3887 }
3888 } else {
3889 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3890 (res == WAIT_FAILED ? "failed" : "timed out"),
3891 GetLastError(), __FILE__, __LINE__);
3892 // Don't keep handles, if we failed waiting for them.
3893 for (i = 0; i < MAXIMUM_WAIT_OBJECTS; ++i) {
3894 CloseHandle(handles[i]);
3895 }
3896 handle_count = 0;
3897 }
3898 }
3899
3900 // Store a duplicate of the current thread handle in the array of handles.
3901 hproc = GetCurrentProcess();
3902 hthr = GetCurrentThread();
3903 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3904 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3905 warning("DuplicateHandle failed (%u) in %s: %d\n",
3906 GetLastError(), __FILE__, __LINE__);
3907 } else {
3908 ++handle_count;
3909 }
3910
3911 // The current exiting thread has stored its handle in the array, and now
3912 // should leave the critical section before calling _endthreadex().
3913
3914 } else if (what != EPT_THREAD) {
3915 if (handle_count > 0) {
3916 // Before ending the process, make sure all the threads that had called
3917 // _endthreadex() completed.
3918
3919 // Set the priority level of the current thread to the same value as
3920 // the priority level of exiting threads.
3921 // This is to ensure it will be given a fair chance to execute if
3922 // the timeout expires.
3923 hthr = GetCurrentThread();
3924 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3925 for (i = 0; i < handle_count; ++i) {
3926 SetThreadPriority(handles[i], THREAD_PRIORITY_ABOVE_NORMAL);
3927 }
3928 res = WaitForMultipleObjects(handle_count, handles, TRUE, EXIT_TIMEOUT);
3929 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3930 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3931 (res == WAIT_FAILED ? "failed" : "timed out"),
3932 GetLastError(), __FILE__, __LINE__);
3933 }
3934 for (i = 0; i < handle_count; ++i) {
3935 CloseHandle(handles[i]);
3936 }
3937 handle_count = 0;
3938 }
3939
3940 OrderAccess::release_store(&process_exiting, 1);
3941 }
3942
3943 LeaveCriticalSection(&crit_sect);
3944 }
3945
3946 if (what == EPT_THREAD) {
3947 while (OrderAccess::load_acquire(&process_exiting) != 0) {
3948 // Some other thread is about to call exit(), so we
3949 // don't let the current thread proceed to _endthreadex()
3950 SuspendThread(GetCurrentThread());
3951 // Avoid busy-wait loop, if SuspendThread() failed.
3952 Sleep(EXIT_TIMEOUT);
3953 }
3954 }
3955 }
3956
3957 // We are here if either
3958 // - there's no 'race at exit' bug on this OS release;
3959 // - initialization of the critical section failed (unlikely);
3960 // - the current thread has stored its handle and left the critical section;
3961 // - the process-exiting thread has raised the flag and left the critical section.
3962 if (what == EPT_THREAD) {
3963 _endthreadex((unsigned)exit_code);
3964 } else if (what == EPT_PROCESS) {
3965 ::exit(exit_code);
3966 } else {
3967 _exit(exit_code);
3968 }
3969
3970 // Should not reach here
3971 return exit_code;
3972 }
3973
3974 #undef EXIT_TIMEOUT
3975
3976 void os::win32::setmode_streams() {
3977 _setmode(_fileno(stdin), _O_BINARY);
3978 _setmode(_fileno(stdout), _O_BINARY);
3979 _setmode(_fileno(stderr), _O_BINARY);
3980 }
3981
3982
3983 bool os::is_debugger_attached() {
3984 return IsDebuggerPresent() ? true : false;
3985 }
3986
3987
3988 void os::wait_for_keypress_at_exit(void) {
3989 if (PauseAtExit) {
3990 fprintf(stderr, "Press any key to continue...\n");
3991 fgetc(stdin);
3992 }
3993 }
3994
3995
3996 int os::message_box(const char* title, const char* message) {
3997 int result = MessageBox(NULL, message, title,
3998 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3999 return result == IDYES;
4000 }
4001
4002 int os::allocate_thread_local_storage() {
4003 return TlsAlloc();
4004 }
4005
4006
4007 void os::free_thread_local_storage(int index) {
4008 TlsFree(index);
4009 }
4010
4011
4012 void os::thread_local_storage_at_put(int index, void* value) {
4013 TlsSetValue(index, value);
4014 assert(thread_local_storage_at(index) == value, "Just checking");
4015 }
4016
4017
4018 void* os::thread_local_storage_at(int index) {
4019 return TlsGetValue(index);
4020 }
4021
4022
4023 #ifndef PRODUCT
4024 #ifndef _WIN64
4025 // Helpers to check whether NX protection is enabled
4026 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4027 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4028 pex->ExceptionRecord->NumberParameters > 0 &&
4029 pex->ExceptionRecord->ExceptionInformation[0] ==
4030 EXCEPTION_INFO_EXEC_VIOLATION) {
4031 return EXCEPTION_EXECUTE_HANDLER;
4032 }
4033 return EXCEPTION_CONTINUE_SEARCH;
4034 }
4035
4036 void nx_check_protection() {
4037 // If NX is enabled we'll get an exception calling into code on the stack
4038 char code[] = { (char)0xC3 }; // ret
4039 void *code_ptr = (void *)code;
4040 __try {
4041 __asm call code_ptr
4042 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4043 tty->print_raw_cr("NX protection detected.");
4044 }
4045 }
4046 #endif // _WIN64
4047 #endif // PRODUCT
4048
4049 // this is called _before_ the global arguments have been parsed
4050 void os::init(void) {
4051 _initial_pid = _getpid();
4052
4053 init_random(1234567);
4054
4055 win32::initialize_system_info();
4056 win32::setmode_streams();
4057 init_page_sizes((size_t) win32::vm_page_size());
4058
4059 // This may be overridden later when argument processing is done.
4060 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4061 os::win32::is_windows_2003());
4062
4063 // Initialize main_process and main_thread
4064 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4065 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4066 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4067 fatal("DuplicateHandle failed\n");
4068 }
4069 main_thread_id = (int) GetCurrentThreadId();
4070 }
4071
4072 // To install functions for atexit processing
4073 extern "C" {
4074 static void perfMemory_exit_helper() {
4075 perfMemory_exit();
4076 }
4077 }
4078
4079 static jint initSock();
4080
4081 // this is called _after_ the global arguments have been parsed
4082 jint os::init_2(void) {
4083 // Allocate a single page and mark it as readable for safepoint polling
4084 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4085 guarantee(polling_page != NULL, "Reserve Failed for polling page");
4086
4087 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4088 guarantee(return_page != NULL, "Commit Failed for polling page");
4089
4090 os::set_polling_page(polling_page);
4091
4092 #ifndef PRODUCT
4093 if (Verbose && PrintMiscellaneous) {
4094 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4095 (intptr_t)polling_page);
4096 }
4097 #endif
4098
4099 if (!UseMembar) {
4100 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4101 guarantee(mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4102
4103 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4104 guarantee(return_page != NULL, "Commit Failed for memory serialize page");
4105
4106 os::set_memory_serialize_page(mem_serialize_page);
4107
4108 #ifndef PRODUCT
4109 if (Verbose && PrintMiscellaneous) {
4110 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4111 (intptr_t)mem_serialize_page);
4112 }
4113 #endif
4114 }
4115
4116 // Setup Windows Exceptions
4117
4118 // for debugging float code generation bugs
4119 if (ForceFloatExceptions) {
4120 #ifndef _WIN64
4121 static long fp_control_word = 0;
4122 __asm { fstcw fp_control_word }
4123 // see Intel PPro Manual, Vol. 2, p 7-16
4124 const long precision = 0x20;
4125 const long underflow = 0x10;
4126 const long overflow = 0x08;
4127 const long zero_div = 0x04;
4128 const long denorm = 0x02;
4129 const long invalid = 0x01;
4130 fp_control_word |= invalid;
4131 __asm { fldcw fp_control_word }
4132 #endif
4133 }
4134
4135 // If stack_commit_size is 0, windows will reserve the default size,
4136 // but only commit a small portion of it.
4137 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4138 size_t default_reserve_size = os::win32::default_stack_size();
4139 size_t actual_reserve_size = stack_commit_size;
4140 if (stack_commit_size < default_reserve_size) {
4141 // If stack_commit_size == 0, we want this too
4142 actual_reserve_size = default_reserve_size;
4143 }
4144
4145 // Check minimum allowable stack size for thread creation and to initialize
4146 // the java system classes, including StackOverflowError - depends on page
4147 // size. Add a page for compiler2 recursion in main thread.
4148 // Add in 2*BytesPerWord times page size to account for VM stack during
4149 // class initialization depending on 32 or 64 bit VM.
4150 size_t min_stack_allowed =
4151 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4152 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4153 if (actual_reserve_size < min_stack_allowed) {
4154 tty->print_cr("\nThe stack size specified is too small, "
4155 "Specify at least %dk",
4156 min_stack_allowed / K);
4157 return JNI_ERR;
4158 }
4159
4160 JavaThread::set_stack_size_at_create(stack_commit_size);
4161
4162 // Calculate theoretical max. size of Threads to guard gainst artifical
4163 // out-of-memory situations, where all available address-space has been
4164 // reserved by thread stacks.
4165 assert(actual_reserve_size != 0, "Must have a stack");
4166
4167 // Calculate the thread limit when we should start doing Virtual Memory
4168 // banging. Currently when the threads will have used all but 200Mb of space.
4169 //
4170 // TODO: consider performing a similar calculation for commit size instead
4171 // as reserve size, since on a 64-bit platform we'll run into that more
4172 // often than running out of virtual memory space. We can use the
4173 // lower value of the two calculations as the os_thread_limit.
4174 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4175 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4176
4177 // at exit methods are called in the reverse order of their registration.
4178 // there is no limit to the number of functions registered. atexit does
4179 // not set errno.
4180
4181 if (PerfAllowAtExitRegistration) {
4182 // only register atexit functions if PerfAllowAtExitRegistration is set.
4183 // atexit functions can be delayed until process exit time, which
4184 // can be problematic for embedded VM situations. Embedded VMs should
4185 // call DestroyJavaVM() to assure that VM resources are released.
4186
4187 // note: perfMemory_exit_helper atexit function may be removed in
4188 // the future if the appropriate cleanup code can be added to the
4189 // VM_Exit VMOperation's doit method.
4190 if (atexit(perfMemory_exit_helper) != 0) {
4191 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4192 }
4193 }
4194
4195 #ifndef _WIN64
4196 // Print something if NX is enabled (win32 on AMD64)
4197 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4198 #endif
4199
4200 // initialize thread priority policy
4201 prio_init();
4202
4203 if (UseNUMA && !ForceNUMA) {
4204 UseNUMA = false; // We don't fully support this yet
4205 }
4206
4207 if (UseNUMAInterleaving) {
4208 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4209 bool success = numa_interleaving_init();
4210 if (!success) UseNUMAInterleaving = false;
4211 }
4212
4213 if (initSock() != JNI_OK) {
4214 return JNI_ERR;
4215 }
4216
4217 return JNI_OK;
4218 }
4219
4220 // Mark the polling page as unreadable
4221 void os::make_polling_page_unreadable(void) {
4222 DWORD old_status;
4223 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4224 PAGE_NOACCESS, &old_status)) {
4225 fatal("Could not disable polling page");
4226 }
4227 }
4228
4229 // Mark the polling page as readable
4230 void os::make_polling_page_readable(void) {
4231 DWORD old_status;
4232 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4233 PAGE_READONLY, &old_status)) {
4234 fatal("Could not enable polling page");
4235 }
4236 }
4237
4238
4239 int os::stat(const char *path, struct stat *sbuf) {
4240 char pathbuf[MAX_PATH];
4241 if (strlen(path) > MAX_PATH - 1) {
4242 errno = ENAMETOOLONG;
4243 return -1;
4244 }
4245 os::native_path(strcpy(pathbuf, path));
4246 int ret = ::stat(pathbuf, sbuf);
4247 if (sbuf != NULL && UseUTCFileTimestamp) {
4248 // Fix for 6539723. st_mtime returned from stat() is dependent on
4249 // the system timezone and so can return different values for the
4250 // same file if/when daylight savings time changes. This adjustment
4251 // makes sure the same timestamp is returned regardless of the TZ.
4252 //
4253 // See:
4254 // http://msdn.microsoft.com/library/
4255 // default.asp?url=/library/en-us/sysinfo/base/
4256 // time_zone_information_str.asp
4257 // and
4258 // http://msdn.microsoft.com/library/default.asp?url=
4259 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4260 //
4261 // NOTE: there is a insidious bug here: If the timezone is changed
4262 // after the call to stat() but before 'GetTimeZoneInformation()', then
4263 // the adjustment we do here will be wrong and we'll return the wrong
4264 // value (which will likely end up creating an invalid class data
4265 // archive). Absent a better API for this, or some time zone locking
4266 // mechanism, we'll have to live with this risk.
4267 TIME_ZONE_INFORMATION tz;
4268 DWORD tzid = GetTimeZoneInformation(&tz);
4269 int daylightBias =
4270 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4271 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4272 }
4273 return ret;
4274 }
4275
4276
4277 #define FT2INT64(ft) \
4278 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4279
4280
4281 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4282 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4283 // of a thread.
4284 //
4285 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4286 // the fast estimate available on the platform.
4287
4288 // current_thread_cpu_time() is not optimized for Windows yet
4289 jlong os::current_thread_cpu_time() {
4290 // return user + sys since the cost is the same
4291 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4292 }
4293
4294 jlong os::thread_cpu_time(Thread* thread) {
4295 // consistent with what current_thread_cpu_time() returns.
4296 return os::thread_cpu_time(thread, true /* user+sys */);
4297 }
4298
4299 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4300 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4301 }
4302
4303 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4304 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4305 // If this function changes, os::is_thread_cpu_time_supported() should too
4306 if (os::win32::is_nt()) {
4307 FILETIME CreationTime;
4308 FILETIME ExitTime;
4309 FILETIME KernelTime;
4310 FILETIME UserTime;
4311
4312 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4313 &ExitTime, &KernelTime, &UserTime) == 0) {
4314 return -1;
4315 } else if (user_sys_cpu_time) {
4316 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4317 } else {
4318 return FT2INT64(UserTime) * 100;
4319 }
4320 } else {
4321 return (jlong) timeGetTime() * 1000000;
4322 }
4323 }
4324
4325 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4326 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4327 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4328 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4329 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4330 }
4331
4332 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4333 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4334 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4335 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4336 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4337 }
4338
4339 bool os::is_thread_cpu_time_supported() {
4340 // see os::thread_cpu_time
4341 if (os::win32::is_nt()) {
4342 FILETIME CreationTime;
4343 FILETIME ExitTime;
4344 FILETIME KernelTime;
4345 FILETIME UserTime;
4346
4347 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4348 &KernelTime, &UserTime) == 0) {
4349 return false;
4350 } else {
4351 return true;
4352 }
4353 } else {
4354 return false;
4355 }
4356 }
4357
4358 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4359 // It does have primitives (PDH API) to get CPU usage and run queue length.
4360 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4361 // If we wanted to implement loadavg on Windows, we have a few options:
4362 //
4363 // a) Query CPU usage and run queue length and "fake" an answer by
4364 // returning the CPU usage if it's under 100%, and the run queue
4365 // length otherwise. It turns out that querying is pretty slow
4366 // on Windows, on the order of 200 microseconds on a fast machine.
4367 // Note that on the Windows the CPU usage value is the % usage
4368 // since the last time the API was called (and the first call
4369 // returns 100%), so we'd have to deal with that as well.
4370 //
4371 // b) Sample the "fake" answer using a sampling thread and store
4372 // the answer in a global variable. The call to loadavg would
4373 // just return the value of the global, avoiding the slow query.
4374 //
4375 // c) Sample a better answer using exponential decay to smooth the
4376 // value. This is basically the algorithm used by UNIX kernels.
4377 //
4378 // Note that sampling thread starvation could affect both (b) and (c).
4379 int os::loadavg(double loadavg[], int nelem) {
4380 return -1;
4381 }
4382
4383
4384 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4385 bool os::dont_yield() {
4386 return DontYieldALot;
4387 }
4388
4389 // This method is a slightly reworked copy of JDK's sysOpen
4390 // from src/windows/hpi/src/sys_api_md.c
4391
4392 int os::open(const char *path, int oflag, int mode) {
4393 char pathbuf[MAX_PATH];
4394
4395 if (strlen(path) > MAX_PATH - 1) {
4396 errno = ENAMETOOLONG;
4397 return -1;
4398 }
4399 os::native_path(strcpy(pathbuf, path));
4400 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4401 }
4402
4403 FILE* os::open(int fd, const char* mode) {
4404 return ::_fdopen(fd, mode);
4405 }
4406
4407 // Is a (classpath) directory empty?
4408 bool os::dir_is_empty(const char* path) {
4409 WIN32_FIND_DATA fd;
4410 HANDLE f = FindFirstFile(path, &fd);
4411 if (f == INVALID_HANDLE_VALUE) {
4412 return true;
4413 }
4414 FindClose(f);
4415 return false;
4416 }
4417
4418 // create binary file, rewriting existing file if required
4419 int os::create_binary_file(const char* path, bool rewrite_existing) {
4420 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4421 if (!rewrite_existing) {
4422 oflags |= _O_EXCL;
4423 }
4424 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4425 }
4426
4427 // return current position of file pointer
4428 jlong os::current_file_offset(int fd) {
4429 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4430 }
4431
4432 // move file pointer to the specified offset
4433 jlong os::seek_to_file_offset(int fd, jlong offset) {
4434 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4435 }
4436
4437
4438 jlong os::lseek(int fd, jlong offset, int whence) {
4439 return (jlong) ::_lseeki64(fd, offset, whence);
4440 }
4441
4442 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4443 OVERLAPPED ov;
4444 DWORD nread;
4445 BOOL result;
4446
4447 ZeroMemory(&ov, sizeof(ov));
4448 ov.Offset = (DWORD)offset;
4449 ov.OffsetHigh = (DWORD)(offset >> 32);
4450
4451 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4452
4453 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4454
4455 return result ? nread : 0;
4456 }
4457
4458
4459 // This method is a slightly reworked copy of JDK's sysNativePath
4460 // from src/windows/hpi/src/path_md.c
4461
4462 // Convert a pathname to native format. On win32, this involves forcing all
4463 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4464 // sometimes rejects '/') and removing redundant separators. The input path is
4465 // assumed to have been converted into the character encoding used by the local
4466 // system. Because this might be a double-byte encoding, care is taken to
4467 // treat double-byte lead characters correctly.
4468 //
4469 // This procedure modifies the given path in place, as the result is never
4470 // longer than the original. There is no error return; this operation always
4471 // succeeds.
4472 char * os::native_path(char *path) {
4473 char *src = path, *dst = path, *end = path;
4474 char *colon = NULL; // If a drive specifier is found, this will
4475 // point to the colon following the drive letter
4476
4477 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4478 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4479 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4480
4481 // Check for leading separators
4482 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4483 while (isfilesep(*src)) {
4484 src++;
4485 }
4486
4487 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4488 // Remove leading separators if followed by drive specifier. This
4489 // hack is necessary to support file URLs containing drive
4490 // specifiers (e.g., "file://c:/path"). As a side effect,
4491 // "/c:/path" can be used as an alternative to "c:/path".
4492 *dst++ = *src++;
4493 colon = dst;
4494 *dst++ = ':';
4495 src++;
4496 } else {
4497 src = path;
4498 if (isfilesep(src[0]) && isfilesep(src[1])) {
4499 // UNC pathname: Retain first separator; leave src pointed at
4500 // second separator so that further separators will be collapsed
4501 // into the second separator. The result will be a pathname
4502 // beginning with "\\\\" followed (most likely) by a host name.
4503 src = dst = path + 1;
4504 path[0] = '\\'; // Force first separator to '\\'
4505 }
4506 }
4507
4508 end = dst;
4509
4510 // Remove redundant separators from remainder of path, forcing all
4511 // separators to be '\\' rather than '/'. Also, single byte space
4512 // characters are removed from the end of the path because those
4513 // are not legal ending characters on this operating system.
4514 //
4515 while (*src != '\0') {
4516 if (isfilesep(*src)) {
4517 *dst++ = '\\'; src++;
4518 while (isfilesep(*src)) src++;
4519 if (*src == '\0') {
4520 // Check for trailing separator
4521 end = dst;
4522 if (colon == dst - 2) break; // "z:\\"
4523 if (dst == path + 1) break; // "\\"
4524 if (dst == path + 2 && isfilesep(path[0])) {
4525 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4526 // beginning of a UNC pathname. Even though it is not, by
4527 // itself, a valid UNC pathname, we leave it as is in order
4528 // to be consistent with the path canonicalizer as well
4529 // as the win32 APIs, which treat this case as an invalid
4530 // UNC pathname rather than as an alias for the root
4531 // directory of the current drive.
4532 break;
4533 }
4534 end = --dst; // Path does not denote a root directory, so
4535 // remove trailing separator
4536 break;
4537 }
4538 end = dst;
4539 } else {
4540 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4541 *dst++ = *src++;
4542 if (*src) *dst++ = *src++;
4543 end = dst;
4544 } else { // Copy a single-byte character
4545 char c = *src++;
4546 *dst++ = c;
4547 // Space is not a legal ending character
4548 if (c != ' ') end = dst;
4549 }
4550 }
4551 }
4552
4553 *end = '\0';
4554
4555 // For "z:", add "." to work around a bug in the C runtime library
4556 if (colon == dst - 1) {
4557 path[2] = '.';
4558 path[3] = '\0';
4559 }
4560
4561 return path;
4562 }
4563
4564 // This code is a copy of JDK's sysSetLength
4565 // from src/windows/hpi/src/sys_api_md.c
4566
4567 int os::ftruncate(int fd, jlong length) {
4568 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4569 long high = (long)(length >> 32);
4570 DWORD ret;
4571
4572 if (h == (HANDLE)(-1)) {
4573 return -1;
4574 }
4575
4576 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4577 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4578 return -1;
4579 }
4580
4581 if (::SetEndOfFile(h) == FALSE) {
4582 return -1;
4583 }
4584
4585 return 0;
4586 }
4587
4588
4589 // This code is a copy of JDK's sysSync
4590 // from src/windows/hpi/src/sys_api_md.c
4591 // except for the legacy workaround for a bug in Win 98
4592
4593 int os::fsync(int fd) {
4594 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4595
4596 if ((!::FlushFileBuffers(handle)) &&
4597 (GetLastError() != ERROR_ACCESS_DENIED)) {
4598 // from winerror.h
4599 return -1;
4600 }
4601 return 0;
4602 }
4603
4604 static int nonSeekAvailable(int, long *);
4605 static int stdinAvailable(int, long *);
4606
4607 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4608 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4609
4610 // This code is a copy of JDK's sysAvailable
4611 // from src/windows/hpi/src/sys_api_md.c
4612
4613 int os::available(int fd, jlong *bytes) {
4614 jlong cur, end;
4615 struct _stati64 stbuf64;
4616
4617 if (::_fstati64(fd, &stbuf64) >= 0) {
4618 int mode = stbuf64.st_mode;
4619 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4620 int ret;
4621 long lpbytes;
4622 if (fd == 0) {
4623 ret = stdinAvailable(fd, &lpbytes);
4624 } else {
4625 ret = nonSeekAvailable(fd, &lpbytes);
4626 }
4627 (*bytes) = (jlong)(lpbytes);
4628 return ret;
4629 }
4630 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4631 return FALSE;
4632 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4633 return FALSE;
4634 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4635 return FALSE;
4636 }
4637 *bytes = end - cur;
4638 return TRUE;
4639 } else {
4640 return FALSE;
4641 }
4642 }
4643
4644 // This code is a copy of JDK's nonSeekAvailable
4645 // from src/windows/hpi/src/sys_api_md.c
4646
4647 static int nonSeekAvailable(int fd, long *pbytes) {
4648 // This is used for available on non-seekable devices
4649 // (like both named and anonymous pipes, such as pipes
4650 // connected to an exec'd process).
4651 // Standard Input is a special case.
4652 HANDLE han;
4653
4654 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4655 return FALSE;
4656 }
4657
4658 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4659 // PeekNamedPipe fails when at EOF. In that case we
4660 // simply make *pbytes = 0 which is consistent with the
4661 // behavior we get on Solaris when an fd is at EOF.
4662 // The only alternative is to raise an Exception,
4663 // which isn't really warranted.
4664 //
4665 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4666 return FALSE;
4667 }
4668 *pbytes = 0;
4669 }
4670 return TRUE;
4671 }
4672
4673 #define MAX_INPUT_EVENTS 2000
4674
4675 // This code is a copy of JDK's stdinAvailable
4676 // from src/windows/hpi/src/sys_api_md.c
4677
4678 static int stdinAvailable(int fd, long *pbytes) {
4679 HANDLE han;
4680 DWORD numEventsRead = 0; // Number of events read from buffer
4681 DWORD numEvents = 0; // Number of events in buffer
4682 DWORD i = 0; // Loop index
4683 DWORD curLength = 0; // Position marker
4684 DWORD actualLength = 0; // Number of bytes readable
4685 BOOL error = FALSE; // Error holder
4686 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4687
4688 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4689 return FALSE;
4690 }
4691
4692 // Construct an array of input records in the console buffer
4693 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4694 if (error == 0) {
4695 return nonSeekAvailable(fd, pbytes);
4696 }
4697
4698 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4699 if (numEvents > MAX_INPUT_EVENTS) {
4700 numEvents = MAX_INPUT_EVENTS;
4701 }
4702
4703 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4704 if (lpBuffer == NULL) {
4705 return FALSE;
4706 }
4707
4708 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4709 if (error == 0) {
4710 os::free(lpBuffer);
4711 return FALSE;
4712 }
4713
4714 // Examine input records for the number of bytes available
4715 for (i=0; i<numEvents; i++) {
4716 if (lpBuffer[i].EventType == KEY_EVENT) {
4717
4718 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4719 &(lpBuffer[i].Event);
4720 if (keyRecord->bKeyDown == TRUE) {
4721 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4722 curLength++;
4723 if (*keyPressed == '\r') {
4724 actualLength = curLength;
4725 }
4726 }
4727 }
4728 }
4729
4730 if (lpBuffer != NULL) {
4731 os::free(lpBuffer);
4732 }
4733
4734 *pbytes = (long) actualLength;
4735 return TRUE;
4736 }
4737
4738 // Map a block of memory.
4739 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4740 char *addr, size_t bytes, bool read_only,
4741 bool allow_exec) {
4742 HANDLE hFile;
4743 char* base;
4744
4745 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4746 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4747 if (hFile == NULL) {
4748 if (PrintMiscellaneous && Verbose) {
4749 DWORD err = GetLastError();
4750 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4751 }
4752 return NULL;
4753 }
4754
4755 if (allow_exec) {
4756 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4757 // unless it comes from a PE image (which the shared archive is not.)
4758 // Even VirtualProtect refuses to give execute access to mapped memory
4759 // that was not previously executable.
4760 //
4761 // Instead, stick the executable region in anonymous memory. Yuck.
4762 // Penalty is that ~4 pages will not be shareable - in the future
4763 // we might consider DLLizing the shared archive with a proper PE
4764 // header so that mapping executable + sharing is possible.
4765
4766 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4767 PAGE_READWRITE);
4768 if (base == NULL) {
4769 if (PrintMiscellaneous && Verbose) {
4770 DWORD err = GetLastError();
4771 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4772 }
4773 CloseHandle(hFile);
4774 return NULL;
4775 }
4776
4777 DWORD bytes_read;
4778 OVERLAPPED overlapped;
4779 overlapped.Offset = (DWORD)file_offset;
4780 overlapped.OffsetHigh = 0;
4781 overlapped.hEvent = NULL;
4782 // ReadFile guarantees that if the return value is true, the requested
4783 // number of bytes were read before returning.
4784 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4785 if (!res) {
4786 if (PrintMiscellaneous && Verbose) {
4787 DWORD err = GetLastError();
4788 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4789 }
4790 release_memory(base, bytes);
4791 CloseHandle(hFile);
4792 return NULL;
4793 }
4794 } else {
4795 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4796 NULL /* file_name */);
4797 if (hMap == NULL) {
4798 if (PrintMiscellaneous && Verbose) {
4799 DWORD err = GetLastError();
4800 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4801 }
4802 CloseHandle(hFile);
4803 return NULL;
4804 }
4805
4806 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4807 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4808 (DWORD)bytes, addr);
4809 if (base == NULL) {
4810 if (PrintMiscellaneous && Verbose) {
4811 DWORD err = GetLastError();
4812 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4813 }
4814 CloseHandle(hMap);
4815 CloseHandle(hFile);
4816 return NULL;
4817 }
4818
4819 if (CloseHandle(hMap) == 0) {
4820 if (PrintMiscellaneous && Verbose) {
4821 DWORD err = GetLastError();
4822 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4823 }
4824 CloseHandle(hFile);
4825 return base;
4826 }
4827 }
4828
4829 if (allow_exec) {
4830 DWORD old_protect;
4831 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4832 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4833
4834 if (!res) {
4835 if (PrintMiscellaneous && Verbose) {
4836 DWORD err = GetLastError();
4837 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4838 }
4839 // Don't consider this a hard error, on IA32 even if the
4840 // VirtualProtect fails, we should still be able to execute
4841 CloseHandle(hFile);
4842 return base;
4843 }
4844 }
4845
4846 if (CloseHandle(hFile) == 0) {
4847 if (PrintMiscellaneous && Verbose) {
4848 DWORD err = GetLastError();
4849 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4850 }
4851 return base;
4852 }
4853
4854 return base;
4855 }
4856
4857
4858 // Remap a block of memory.
4859 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4860 char *addr, size_t bytes, bool read_only,
4861 bool allow_exec) {
4862 // This OS does not allow existing memory maps to be remapped so we
4863 // have to unmap the memory before we remap it.
4864 if (!os::unmap_memory(addr, bytes)) {
4865 return NULL;
4866 }
4867
4868 // There is a very small theoretical window between the unmap_memory()
4869 // call above and the map_memory() call below where a thread in native
4870 // code may be able to access an address that is no longer mapped.
4871
4872 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4873 read_only, allow_exec);
4874 }
4875
4876
4877 // Unmap a block of memory.
4878 // Returns true=success, otherwise false.
4879
4880 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4881 BOOL result = UnmapViewOfFile(addr);
4882 if (result == 0) {
4883 if (PrintMiscellaneous && Verbose) {
4884 DWORD err = GetLastError();
4885 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4886 }
4887 return false;
4888 }
4889 return true;
4890 }
4891
4892 void os::pause() {
4893 char filename[MAX_PATH];
4894 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4895 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4896 } else {
4897 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4898 }
4899
4900 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4901 if (fd != -1) {
4902 struct stat buf;
4903 ::close(fd);
4904 while (::stat(filename, &buf) == 0) {
4905 Sleep(100);
4906 }
4907 } else {
4908 jio_fprintf(stderr,
4909 "Could not open pause file '%s', continuing immediately.\n", filename);
4910 }
4911 }
4912
4913 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4914 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4915 }
4916
4917 // See the caveats for this class in os_windows.hpp
4918 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4919 // into this method and returns false. If no OS EXCEPTION was raised, returns
4920 // true.
4921 // The callback is supposed to provide the method that should be protected.
4922 //
4923 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4924 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4925 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4926 "crash_protection already set?");
4927
4928 bool success = true;
4929 __try {
4930 WatcherThread::watcher_thread()->set_crash_protection(this);
4931 cb.call();
4932 } __except(EXCEPTION_EXECUTE_HANDLER) {
4933 // only for protection, nothing to do
4934 success = false;
4935 }
4936 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4937 return success;
4938 }
4939
4940 // An Event wraps a win32 "CreateEvent" kernel handle.
4941 //
4942 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4943 //
4944 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4945 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4946 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4947 // In addition, an unpark() operation might fetch the handle field, but the
4948 // event could recycle between the fetch and the SetEvent() operation.
4949 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4950 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4951 // on an stale but recycled handle would be harmless, but in practice this might
4952 // confuse other non-Sun code, so it's not a viable approach.
4953 //
4954 // 2: Once a win32 event handle is associated with an Event, it remains associated
4955 // with the Event. The event handle is never closed. This could be construed
4956 // as handle leakage, but only up to the maximum # of threads that have been extant
4957 // at any one time. This shouldn't be an issue, as windows platforms typically
4958 // permit a process to have hundreds of thousands of open handles.
4959 //
4960 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4961 // and release unused handles.
4962 //
4963 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4964 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4965 //
4966 // 5. Use an RCU-like mechanism (Read-Copy Update).
4967 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4968 //
4969 // We use (2).
4970 //
4971 // TODO-FIXME:
4972 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4973 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4974 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4975 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4976 // into a single win32 CreateEvent() handle.
4977 //
4978 // Assumption:
4979 // Only one parker can exist on an event, which is why we allocate
4980 // them per-thread. Multiple unparkers can coexist.
4981 //
4982 // _Event transitions in park()
4983 // -1 => -1 : illegal
4984 // 1 => 0 : pass - return immediately
4985 // 0 => -1 : block; then set _Event to 0 before returning
4986 //
4987 // _Event transitions in unpark()
4988 // 0 => 1 : just return
4989 // 1 => 1 : just return
4990 // -1 => either 0 or 1; must signal target thread
4991 // That is, we can safely transition _Event from -1 to either
4992 // 0 or 1.
4993 //
4994 // _Event serves as a restricted-range semaphore.
4995 // -1 : thread is blocked, i.e. there is a waiter
4996 // 0 : neutral: thread is running or ready,
4997 // could have been signaled after a wait started
4998 // 1 : signaled - thread is running or ready
4999 //
5000 // Another possible encoding of _Event would be with
5001 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5002 //
5003
5004 int os::PlatformEvent::park(jlong Millis) {
5005 // Transitions for _Event:
5006 // -1 => -1 : illegal
5007 // 1 => 0 : pass - return immediately
5008 // 0 => -1 : block; then set _Event to 0 before returning
5009
5010 guarantee(_ParkHandle != NULL , "Invariant");
5011 guarantee(Millis > 0 , "Invariant");
5012
5013 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5014 // the initial park() operation.
5015 // Consider: use atomic decrement instead of CAS-loop
5016
5017 int v;
5018 for (;;) {
5019 v = _Event;
5020 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5021 }
5022 guarantee((v == 0) || (v == 1), "invariant");
5023 if (v != 0) return OS_OK;
5024
5025 // Do this the hard way by blocking ...
5026 // TODO: consider a brief spin here, gated on the success of recent
5027 // spin attempts by this thread.
5028 //
5029 // We decompose long timeouts into series of shorter timed waits.
5030 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5031 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5032 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5033 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5034 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5035 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5036 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5037 // for the already waited time. This policy does not admit any new outcomes.
5038 // In the future, however, we might want to track the accumulated wait time and
5039 // adjust Millis accordingly if we encounter a spurious wakeup.
5040
5041 const int MAXTIMEOUT = 0x10000000;
5042 DWORD rv = WAIT_TIMEOUT;
5043 while (_Event < 0 && Millis > 0) {
5044 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5045 if (Millis > MAXTIMEOUT) {
5046 prd = MAXTIMEOUT;
5047 }
5048 rv = ::WaitForSingleObject(_ParkHandle, prd);
5049 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5050 if (rv == WAIT_TIMEOUT) {
5051 Millis -= prd;
5052 }
5053 }
5054 v = _Event;
5055 _Event = 0;
5056 // see comment at end of os::PlatformEvent::park() below:
5057 OrderAccess::fence();
5058 // If we encounter a nearly simultanous timeout expiry and unpark()
5059 // we return OS_OK indicating we awoke via unpark().
5060 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5061 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5062 }
5063
5064 void os::PlatformEvent::park() {
5065 // Transitions for _Event:
5066 // -1 => -1 : illegal
5067 // 1 => 0 : pass - return immediately
5068 // 0 => -1 : block; then set _Event to 0 before returning
5069
5070 guarantee(_ParkHandle != NULL, "Invariant");
5071 // Invariant: Only the thread associated with the Event/PlatformEvent
5072 // may call park().
5073 // Consider: use atomic decrement instead of CAS-loop
5074 int v;
5075 for (;;) {
5076 v = _Event;
5077 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5078 }
5079 guarantee((v == 0) || (v == 1), "invariant");
5080 if (v != 0) return;
5081
5082 // Do this the hard way by blocking ...
5083 // TODO: consider a brief spin here, gated on the success of recent
5084 // spin attempts by this thread.
5085 while (_Event < 0) {
5086 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5087 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5088 }
5089
5090 // Usually we'll find _Event == 0 at this point, but as
5091 // an optional optimization we clear it, just in case can
5092 // multiple unpark() operations drove _Event up to 1.
5093 _Event = 0;
5094 OrderAccess::fence();
5095 guarantee(_Event >= 0, "invariant");
5096 }
5097
5098 void os::PlatformEvent::unpark() {
5099 guarantee(_ParkHandle != NULL, "Invariant");
5100
5101 // Transitions for _Event:
5102 // 0 => 1 : just return
5103 // 1 => 1 : just return
5104 // -1 => either 0 or 1; must signal target thread
5105 // That is, we can safely transition _Event from -1 to either
5106 // 0 or 1.
5107 // See also: "Semaphores in Plan 9" by Mullender & Cox
5108 //
5109 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5110 // that it will take two back-to-back park() calls for the owning
5111 // thread to block. This has the benefit of forcing a spurious return
5112 // from the first park() call after an unpark() call which will help
5113 // shake out uses of park() and unpark() without condition variables.
5114
5115 if (Atomic::xchg(1, &_Event) >= 0) return;
5116
5117 ::SetEvent(_ParkHandle);
5118 }
5119
5120
5121 // JSR166
5122 // -------------------------------------------------------
5123
5124 // The Windows implementation of Park is very straightforward: Basic
5125 // operations on Win32 Events turn out to have the right semantics to
5126 // use them directly. We opportunistically resuse the event inherited
5127 // from Monitor.
5128
5129 void Parker::park(bool isAbsolute, jlong time) {
5130 guarantee(_ParkEvent != NULL, "invariant");
5131 // First, demultiplex/decode time arguments
5132 if (time < 0) { // don't wait
5133 return;
5134 } else if (time == 0 && !isAbsolute) {
5135 time = INFINITE;
5136 } else if (isAbsolute) {
5137 time -= os::javaTimeMillis(); // convert to relative time
5138 if (time <= 0) { // already elapsed
5139 return;
5140 }
5141 } else { // relative
5142 time /= 1000000; // Must coarsen from nanos to millis
5143 if (time == 0) { // Wait for the minimal time unit if zero
5144 time = 1;
5145 }
5146 }
5147
5148 JavaThread* thread = (JavaThread*)(Thread::current());
5149 assert(thread->is_Java_thread(), "Must be JavaThread");
5150 JavaThread *jt = (JavaThread *)thread;
5151
5152 // Don't wait if interrupted or already triggered
5153 if (Thread::is_interrupted(thread, false) ||
5154 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5155 ResetEvent(_ParkEvent);
5156 return;
5157 } else {
5158 ThreadBlockInVM tbivm(jt);
5159 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5160 jt->set_suspend_equivalent();
5161
5162 WaitForSingleObject(_ParkEvent, time);
5163 ResetEvent(_ParkEvent);
5164
5165 // If externally suspended while waiting, re-suspend
5166 if (jt->handle_special_suspend_equivalent_condition()) {
5167 jt->java_suspend_self();
5168 }
5169 }
5170 }
5171
5172 void Parker::unpark() {
5173 guarantee(_ParkEvent != NULL, "invariant");
5174 SetEvent(_ParkEvent);
5175 }
5176
5177 // Run the specified command in a separate process. Return its exit value,
5178 // or -1 on failure (e.g. can't create a new process).
5179 int os::fork_and_exec(char* cmd) {
5180 STARTUPINFO si;
5181 PROCESS_INFORMATION pi;
5182
5183 memset(&si, 0, sizeof(si));
5184 si.cb = sizeof(si);
5185 memset(&pi, 0, sizeof(pi));
5186 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5187 cmd, // command line
5188 NULL, // process security attribute
5189 NULL, // thread security attribute
5190 TRUE, // inherits system handles
5191 0, // no creation flags
5192 NULL, // use parent's environment block
5193 NULL, // use parent's starting directory
5194 &si, // (in) startup information
5195 &pi); // (out) process information
5196
5197 if (rslt) {
5198 // Wait until child process exits.
5199 WaitForSingleObject(pi.hProcess, INFINITE);
5200
5201 DWORD exit_code;
5202 GetExitCodeProcess(pi.hProcess, &exit_code);
5203
5204 // Close process and thread handles.
5205 CloseHandle(pi.hProcess);
5206 CloseHandle(pi.hThread);
5207
5208 return (int)exit_code;
5209 } else {
5210 return -1;
5211 }
5212 }
5213
5214 //--------------------------------------------------------------------------------------------------
5215 // Non-product code
5216
5217 static int mallocDebugIntervalCounter = 0;
5218 static int mallocDebugCounter = 0;
5219 bool os::check_heap(bool force) {
5220 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5221 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5222 // Note: HeapValidate executes two hardware breakpoints when it finds something
5223 // wrong; at these points, eax contains the address of the offending block (I think).
5224 // To get to the exlicit error message(s) below, just continue twice.
5225 HANDLE heap = GetProcessHeap();
5226
5227 // If we fail to lock the heap, then gflags.exe has been used
5228 // or some other special heap flag has been set that prevents
5229 // locking. We don't try to walk a heap we can't lock.
5230 if (HeapLock(heap) != 0) {
5231 PROCESS_HEAP_ENTRY phe;
5232 phe.lpData = NULL;
5233 while (HeapWalk(heap, &phe) != 0) {
5234 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5235 !HeapValidate(heap, 0, phe.lpData)) {
5236 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5237 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5238 fatal("corrupted C heap");
5239 }
5240 }
5241 DWORD err = GetLastError();
5242 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5243 fatal(err_msg("heap walk aborted with error %d", err));
5244 }
5245 HeapUnlock(heap);
5246 }
5247 mallocDebugIntervalCounter = 0;
5248 }
5249 return true;
5250 }
5251
5252
5253 bool os::find(address addr, outputStream* st) {
5254 // Nothing yet
5255 return false;
5256 }
5257
5258 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5259 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5260
5261 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5262 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5263 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5264 address addr = (address) exceptionRecord->ExceptionInformation[1];
5265
5266 if (os::is_memory_serialize_page(thread, addr)) {
5267 return EXCEPTION_CONTINUE_EXECUTION;
5268 }
5269 }
5270
5271 return EXCEPTION_CONTINUE_SEARCH;
5272 }
5273
5274 // We don't build a headless jre for Windows
5275 bool os::is_headless_jre() { return false; }
5276
5277 static jint initSock() {
5278 WSADATA wsadata;
5279
5280 if (!os::WinSock2Dll::WinSock2Available()) {
5281 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5282 ::GetLastError());
5283 return JNI_ERR;
5284 }
5285
5286 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5287 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5288 ::GetLastError());
5289 return JNI_ERR;
5290 }
5291 return JNI_OK;
5292 }
5293
5294 struct hostent* os::get_host_by_name(char* name) {
5295 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5296 }
5297
5298 int os::socket_close(int fd) {
5299 return ::closesocket(fd);
5300 }
5301
5302 int os::socket(int domain, int type, int protocol) {
5303 return ::socket(domain, type, protocol);
5304 }
5305
5306 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5307 return ::connect(fd, him, len);
5308 }
5309
5310 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5311 return ::recv(fd, buf, (int)nBytes, flags);
5312 }
5313
5314 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5315 return ::send(fd, buf, (int)nBytes, flags);
5316 }
5317
5318 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5319 return ::send(fd, buf, (int)nBytes, flags);
5320 }
5321
5322 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5323 #if defined(IA32)
5324 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5325 #elif defined (AMD64)
5326 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5327 #endif
5328
5329 // returns true if thread could be suspended,
5330 // false otherwise
5331 static bool do_suspend(HANDLE* h) {
5332 if (h != NULL) {
5333 if (SuspendThread(*h) != ~0) {
5334 return true;
5335 }
5336 }
5337 return false;
5338 }
5339
5340 // resume the thread
5341 // calling resume on an active thread is a no-op
5342 static void do_resume(HANDLE* h) {
5343 if (h != NULL) {
5344 ResumeThread(*h);
5345 }
5346 }
5347
5348 // retrieve a suspend/resume context capable handle
5349 // from the tid. Caller validates handle return value.
5350 void get_thread_handle_for_extended_context(HANDLE* h,
5351 OSThread::thread_id_t tid) {
5352 if (h != NULL) {
5353 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5354 }
5355 }
5356
5357 // Thread sampling implementation
5358 //
5359 void os::SuspendedThreadTask::internal_do_task() {
5360 CONTEXT ctxt;
5361 HANDLE h = NULL;
5362
5363 // get context capable handle for thread
5364 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5365
5366 // sanity
5367 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5368 return;
5369 }
5370
5371 // suspend the thread
5372 if (do_suspend(&h)) {
5373 ctxt.ContextFlags = sampling_context_flags;
5374 // get thread context
5375 GetThreadContext(h, &ctxt);
5376 SuspendedThreadTaskContext context(_thread, &ctxt);
5377 // pass context to Thread Sampling impl
5378 do_task(context);
5379 // resume thread
5380 do_resume(&h);
5381 }
5382
5383 // close handle
5384 CloseHandle(h);
5385 }
5386
5387
5388 // Kernel32 API
5389 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5390 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5391 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn)(PULONG);
5392 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn)(UCHAR, PULONGLONG);
5393 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5394
5395 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5396 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5397 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5398 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5399 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5400
5401
5402 BOOL os::Kernel32Dll::initialized = FALSE;
5403 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5404 assert(initialized && _GetLargePageMinimum != NULL,
5405 "GetLargePageMinimumAvailable() not yet called");
5406 return _GetLargePageMinimum();
5407 }
5408
5409 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5410 if (!initialized) {
5411 initialize();
5412 }
5413 return _GetLargePageMinimum != NULL;
5414 }
5415
5416 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5417 if (!initialized) {
5418 initialize();
5419 }
5420 return _VirtualAllocExNuma != NULL;
5421 }
5422
5423 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr,
5424 SIZE_T bytes, DWORD flags,
5425 DWORD prot, DWORD node) {
5426 assert(initialized && _VirtualAllocExNuma != NULL,
5427 "NUMACallsAvailable() not yet called");
5428
5429 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5430 }
5431
5432 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5433 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5434 "NUMACallsAvailable() not yet called");
5435
5436 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5437 }
5438
5439 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node,
5440 PULONGLONG proc_mask) {
5441 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5442 "NUMACallsAvailable() not yet called");
5443
5444 return _GetNumaNodeProcessorMask(node, proc_mask);
5445 }
5446
5447 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5448 ULONG FrameToCapture,
5449 PVOID* BackTrace,
5450 PULONG BackTraceHash) {
5451 if (!initialized) {
5452 initialize();
5453 }
5454
5455 if (_RtlCaptureStackBackTrace != NULL) {
5456 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5457 BackTrace, BackTraceHash);
5458 } else {
5459 return 0;
5460 }
5461 }
5462
5463 void os::Kernel32Dll::initializeCommon() {
5464 if (!initialized) {
5465 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5466 assert(handle != NULL, "Just check");
5467 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5468 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5469 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5470 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5471 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5472 initialized = TRUE;
5473 }
5474 }
5475
5476
5477
5478 #ifndef JDK6_OR_EARLIER
5479
5480 void os::Kernel32Dll::initialize() {
5481 initializeCommon();
5482 }
5483
5484
5485 // Kernel32 API
5486 inline BOOL os::Kernel32Dll::SwitchToThread() {
5487 return ::SwitchToThread();
5488 }
5489
5490 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5491 return true;
5492 }
5493
5494 // Help tools
5495 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5496 return true;
5497 }
5498
5499 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5500 DWORD th32ProcessId) {
5501 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5502 }
5503
5504 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,
5505 LPMODULEENTRY32 lpme) {
5506 return ::Module32First(hSnapshot, lpme);
5507 }
5508
5509 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5510 LPMODULEENTRY32 lpme) {
5511 return ::Module32Next(hSnapshot, lpme);
5512 }
5513
5514 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5515 ::GetNativeSystemInfo(lpSystemInfo);
5516 }
5517
5518 // PSAPI API
5519 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess,
5520 HMODULE *lpModule, DWORD cb,
5521 LPDWORD lpcbNeeded) {
5522 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5523 }
5524
5525 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess,
5526 HMODULE hModule,
5527 LPTSTR lpFilename,
5528 DWORD nSize) {
5529 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5530 }
5531
5532 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess,
5533 HMODULE hModule,
5534 LPMODULEINFO lpmodinfo,
5535 DWORD cb) {
5536 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5537 }
5538
5539 inline BOOL os::PSApiDll::PSApiAvailable() {
5540 return true;
5541 }
5542
5543
5544 // WinSock2 API
5545 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested,
5546 LPWSADATA lpWSAData) {
5547 return ::WSAStartup(wVersionRequested, lpWSAData);
5548 }
5549
5550 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5551 return ::gethostbyname(name);
5552 }
5553
5554 inline BOOL os::WinSock2Dll::WinSock2Available() {
5555 return true;
5556 }
5557
5558 // Advapi API
5559 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5560 BOOL DisableAllPrivileges,
5561 PTOKEN_PRIVILEGES NewState,
5562 DWORD BufferLength,
5563 PTOKEN_PRIVILEGES PreviousState,
5564 PDWORD ReturnLength) {
5565 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5566 BufferLength, PreviousState, ReturnLength);
5567 }
5568
5569 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5570 DWORD DesiredAccess,
5571 PHANDLE TokenHandle) {
5572 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5573 }
5574
5575 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5576 LPCTSTR lpName,
5577 PLUID lpLuid) {
5578 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5579 }
5580
5581 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5582 return true;
5583 }
5584
5585 void* os::get_default_process_handle() {
5586 return (void*)GetModuleHandle(NULL);
5587 }
5588
5589 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5590 // which is used to find statically linked in agents.
5591 // Additionally for windows, takes into account __stdcall names.
5592 // Parameters:
5593 // sym_name: Symbol in library we are looking for
5594 // lib_name: Name of library to look in, NULL for shared libs.
5595 // is_absolute_path == true if lib_name is absolute path to agent
5596 // such as "C:/a/b/L.dll"
5597 // == false if only the base name of the library is passed in
5598 // such as "L"
5599 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5600 bool is_absolute_path) {
5601 char *agent_entry_name;
5602 size_t len;
5603 size_t name_len;
5604 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5605 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5606 const char *start;
5607
5608 if (lib_name != NULL) {
5609 len = name_len = strlen(lib_name);
5610 if (is_absolute_path) {
5611 // Need to strip path, prefix and suffix
5612 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5613 lib_name = ++start;
5614 } else {
5615 // Need to check for drive prefix
5616 if ((start = strchr(lib_name, ':')) != NULL) {
5617 lib_name = ++start;
5618 }
5619 }
5620 if (len <= (prefix_len + suffix_len)) {
5621 return NULL;
5622 }
5623 lib_name += prefix_len;
5624 name_len = strlen(lib_name) - suffix_len;
5625 }
5626 }
5627 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5628 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5629 if (agent_entry_name == NULL) {
5630 return NULL;
5631 }
5632 if (lib_name != NULL) {
5633 const char *p = strrchr(sym_name, '@');
5634 if (p != NULL && p != sym_name) {
5635 // sym_name == _Agent_OnLoad@XX
5636 strncpy(agent_entry_name, sym_name, (p - sym_name));
5637 agent_entry_name[(p-sym_name)] = '\0';
5638 // agent_entry_name == _Agent_OnLoad
5639 strcat(agent_entry_name, "_");
5640 strncat(agent_entry_name, lib_name, name_len);
5641 strcat(agent_entry_name, p);
5642 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5643 } else {
5644 strcpy(agent_entry_name, sym_name);
5645 strcat(agent_entry_name, "_");
5646 strncat(agent_entry_name, lib_name, name_len);
5647 }
5648 } else {
5649 strcpy(agent_entry_name, sym_name);
5650 }
5651 return agent_entry_name;
5652 }
5653
5654 #else
5655 // Kernel32 API
5656 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5657 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD, DWORD);
5658 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE, LPMODULEENTRY32);
5659 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE, LPMODULEENTRY32);
5660 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5661
5662 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5663 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5664 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5665 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5666 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5667
5668 void os::Kernel32Dll::initialize() {
5669 if (!initialized) {
5670 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5671 assert(handle != NULL, "Just check");
5672
5673 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5674 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5675 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5676 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5677 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5678 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5679 initializeCommon(); // resolve the functions that always need resolving
5680
5681 initialized = TRUE;
5682 }
5683 }
5684
5685 BOOL os::Kernel32Dll::SwitchToThread() {
5686 assert(initialized && _SwitchToThread != NULL,
5687 "SwitchToThreadAvailable() not yet called");
5688 return _SwitchToThread();
5689 }
5690
5691
5692 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5693 if (!initialized) {
5694 initialize();
5695 }
5696 return _SwitchToThread != NULL;
5697 }
5698
5699 // Help tools
5700 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5701 if (!initialized) {
5702 initialize();
5703 }
5704 return _CreateToolhelp32Snapshot != NULL &&
5705 _Module32First != NULL &&
5706 _Module32Next != NULL;
5707 }
5708
5709 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,
5710 DWORD th32ProcessId) {
5711 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5712 "HelpToolsAvailable() not yet called");
5713
5714 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5715 }
5716
5717 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5718 assert(initialized && _Module32First != NULL,
5719 "HelpToolsAvailable() not yet called");
5720
5721 return _Module32First(hSnapshot, lpme);
5722 }
5723
5724 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,
5725 LPMODULEENTRY32 lpme) {
5726 assert(initialized && _Module32Next != NULL,
5727 "HelpToolsAvailable() not yet called");
5728
5729 return _Module32Next(hSnapshot, lpme);
5730 }
5731
5732
5733 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5734 if (!initialized) {
5735 initialize();
5736 }
5737 return _GetNativeSystemInfo != NULL;
5738 }
5739
5740 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5741 assert(initialized && _GetNativeSystemInfo != NULL,
5742 "GetNativeSystemInfoAvailable() not yet called");
5743
5744 _GetNativeSystemInfo(lpSystemInfo);
5745 }
5746
5747 // PSAPI API
5748
5749
5750 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5751 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);
5752 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5753
5754 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5755 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5756 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5757 BOOL os::PSApiDll::initialized = FALSE;
5758
5759 void os::PSApiDll::initialize() {
5760 if (!initialized) {
5761 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5762 if (handle != NULL) {
5763 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5764 "EnumProcessModules");
5765 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5766 "GetModuleFileNameExA");
5767 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5768 "GetModuleInformation");
5769 }
5770 initialized = TRUE;
5771 }
5772 }
5773
5774
5775
5776 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule,
5777 DWORD cb, LPDWORD lpcbNeeded) {
5778 assert(initialized && _EnumProcessModules != NULL,
5779 "PSApiAvailable() not yet called");
5780 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5781 }
5782
5783 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule,
5784 LPTSTR lpFilename, DWORD nSize) {
5785 assert(initialized && _GetModuleFileNameEx != NULL,
5786 "PSApiAvailable() not yet called");
5787 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5788 }
5789
5790 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule,
5791 LPMODULEINFO lpmodinfo, DWORD cb) {
5792 assert(initialized && _GetModuleInformation != NULL,
5793 "PSApiAvailable() not yet called");
5794 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5795 }
5796
5797 BOOL os::PSApiDll::PSApiAvailable() {
5798 if (!initialized) {
5799 initialize();
5800 }
5801 return _EnumProcessModules != NULL &&
5802 _GetModuleFileNameEx != NULL &&
5803 _GetModuleInformation != NULL;
5804 }
5805
5806
5807 // WinSock2 API
5808 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5809 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5810
5811 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5812 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5813 BOOL os::WinSock2Dll::initialized = FALSE;
5814
5815 void os::WinSock2Dll::initialize() {
5816 if (!initialized) {
5817 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5818 if (handle != NULL) {
5819 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5820 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5821 }
5822 initialized = TRUE;
5823 }
5824 }
5825
5826
5827 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5828 assert(initialized && _WSAStartup != NULL,
5829 "WinSock2Available() not yet called");
5830 return _WSAStartup(wVersionRequested, lpWSAData);
5831 }
5832
5833 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5834 assert(initialized && _gethostbyname != NULL,
5835 "WinSock2Available() not yet called");
5836 return _gethostbyname(name);
5837 }
5838
5839 BOOL os::WinSock2Dll::WinSock2Available() {
5840 if (!initialized) {
5841 initialize();
5842 }
5843 return _WSAStartup != NULL &&
5844 _gethostbyname != NULL;
5845 }
5846
5847 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5848 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5849 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5850
5851 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5852 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5853 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5854 BOOL os::Advapi32Dll::initialized = FALSE;
5855
5856 void os::Advapi32Dll::initialize() {
5857 if (!initialized) {
5858 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5859 if (handle != NULL) {
5860 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5861 "AdjustTokenPrivileges");
5862 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5863 "OpenProcessToken");
5864 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5865 "LookupPrivilegeValueA");
5866 }
5867 initialized = TRUE;
5868 }
5869 }
5870
5871 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5872 BOOL DisableAllPrivileges,
5873 PTOKEN_PRIVILEGES NewState,
5874 DWORD BufferLength,
5875 PTOKEN_PRIVILEGES PreviousState,
5876 PDWORD ReturnLength) {
5877 assert(initialized && _AdjustTokenPrivileges != NULL,
5878 "AdvapiAvailable() not yet called");
5879 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5880 BufferLength, PreviousState, ReturnLength);
5881 }
5882
5883 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle,
5884 DWORD DesiredAccess,
5885 PHANDLE TokenHandle) {
5886 assert(initialized && _OpenProcessToken != NULL,
5887 "AdvapiAvailable() not yet called");
5888 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5889 }
5890
5891 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName,
5892 LPCTSTR lpName, PLUID lpLuid) {
5893 assert(initialized && _LookupPrivilegeValue != NULL,
5894 "AdvapiAvailable() not yet called");
5895 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5896 }
5897
5898 BOOL os::Advapi32Dll::AdvapiAvailable() {
5899 if (!initialized) {
5900 initialize();
5901 }
5902 return _AdjustTokenPrivileges != NULL &&
5903 _OpenProcessToken != NULL &&
5904 _LookupPrivilegeValue != NULL;
5905 }
5906
5907 #endif
5908
5909 #ifndef PRODUCT
5910
5911 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5912 // contiguous memory block at a particular address.
5913 // The test first tries to find a good approximate address to allocate at by using the same
5914 // method to allocate some memory at any address. The test then tries to allocate memory in
5915 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5916 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5917 // the previously allocated memory is available for allocation. The only actual failure
5918 // that is reported is when the test tries to allocate at a particular location but gets a
5919 // different valid one. A NULL return value at this point is not considered an error but may
5920 // be legitimate.
5921 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5922 void TestReserveMemorySpecial_test() {
5923 if (!UseLargePages) {
5924 if (VerboseInternalVMTests) {
5925 gclog_or_tty->print("Skipping test because large pages are disabled");
5926 }
5927 return;
5928 }
5929 // save current value of globals
5930 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5931 bool old_use_numa_interleaving = UseNUMAInterleaving;
5932
5933 // set globals to make sure we hit the correct code path
5934 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5935
5936 // do an allocation at an address selected by the OS to get a good one.
5937 const size_t large_allocation_size = os::large_page_size() * 4;
5938 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5939 if (result == NULL) {
5940 if (VerboseInternalVMTests) {
5941 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5942 large_allocation_size);
5943 }
5944 } else {
5945 os::release_memory_special(result, large_allocation_size);
5946
5947 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5948 // we managed to get it once.
5949 const size_t expected_allocation_size = os::large_page_size();
5950 char* expected_location = result + os::large_page_size();
5951 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5952 if (actual_location == NULL) {
5953 if (VerboseInternalVMTests) {
5954 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5955 expected_location, large_allocation_size);
5956 }
5957 } else {
5958 // release memory
5959 os::release_memory_special(actual_location, expected_allocation_size);
5960 // only now check, after releasing any memory to avoid any leaks.
5961 assert(actual_location == expected_location,
5962 err_msg("Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5963 expected_location, expected_allocation_size, actual_location));
5964 }
5965 }
5966
5967 // restore globals
5968 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5969 UseNUMAInterleaving = old_use_numa_interleaving;
5970 }
5971 #endif // PRODUCT