1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
75
76
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
83
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
94
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
106
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
111
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #else
115 #ifdef _M_AMD64
116 #define __CPU__ amd64
117 #else
118 #define __CPU__ i486
119 #endif
120 #endif
121
122 // save DLL module handle, used by GetModuleFileName
123
124 HINSTANCE vm_lib_handle;
125
126 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
127 switch (reason) {
128 case DLL_PROCESS_ATTACH:
129 vm_lib_handle = hinst;
130 if(ForceTimeHighResolution)
131 timeBeginPeriod(1L);
132 break;
133 case DLL_PROCESS_DETACH:
134 if(ForceTimeHighResolution)
135 timeEndPeriod(1L);
136
137 break;
138 default:
139 break;
140 }
141 return true;
142 }
143
144 static inline double fileTimeAsDouble(FILETIME* time) {
145 const double high = (double) ((unsigned int) ~0);
146 const double split = 10000000.0;
147 double result = (time->dwLowDateTime / split) +
148 time->dwHighDateTime * (high/split);
149 return result;
150 }
151
152 // Implementation of os
153
154 bool os::getenv(const char* name, char* buffer, int len) {
155 int result = GetEnvironmentVariable(name, buffer, len);
156 return result > 0 && result < len;
157 }
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 #ifndef _WIN64
178 // previous UnhandledExceptionFilter, if there is one
179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
180
181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
182 #endif
183 void os::init_system_properties_values() {
184 /* sysclasspath, java_home, dll_dir */
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH];
191
192 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; /* get rid of \{client|server} */
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL)
202 *pslash = '\0'; /* get rid of \bin */
203 }
204 }
205
206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
207 if (home_path == NULL)
208 return;
209 strcpy(home_path, home_dir);
210 Arguments::set_java_home(home_path);
211
212 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
213 if (dll_path == NULL)
214 return;
215 strcpy(dll_path, home_dir);
216 strcat(dll_path, bin);
217 Arguments::set_dll_dir(dll_path);
218
219 if (!set_boot_path('\\', ';'))
220 return;
221 }
222
223 /* library_path */
224 #define EXT_DIR "\\lib\\ext"
225 #define BIN_DIR "\\bin"
226 #define PACKAGE_DIR "\\Sun\\Java"
227 {
228 /* Win32 library search order (See the documentation for LoadLibrary):
229 *
230 * 1. The directory from which application is loaded.
231 * 2. The system wide Java Extensions directory (Java only)
232 * 3. System directory (GetSystemDirectory)
233 * 4. Windows directory (GetWindowsDirectory)
234 * 5. The PATH environment variable
235 * 6. The current directory
236 */
237
238 char *library_path;
239 char tmp[MAX_PATH];
240 char *path_str = ::getenv("PATH");
241
242 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
243 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
244
245 library_path[0] = '\0';
246
247 GetModuleFileName(NULL, tmp, sizeof(tmp));
248 *(strrchr(tmp, '\\')) = '\0';
249 strcat(library_path, tmp);
250
251 GetWindowsDirectory(tmp, sizeof(tmp));
252 strcat(library_path, ";");
253 strcat(library_path, tmp);
254 strcat(library_path, PACKAGE_DIR BIN_DIR);
255
256 GetSystemDirectory(tmp, sizeof(tmp));
257 strcat(library_path, ";");
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263
264 if (path_str) {
265 strcat(library_path, ";");
266 strcat(library_path, path_str);
267 }
268
269 strcat(library_path, ";.");
270
271 Arguments::set_library_path(library_path);
272 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
273 }
274
275 /* Default extensions directory */
276 {
277 char path[MAX_PATH];
278 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
279 GetWindowsDirectory(path, MAX_PATH);
280 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
281 path, PACKAGE_DIR, EXT_DIR);
282 Arguments::set_ext_dirs(buf);
283 }
284 #undef EXT_DIR
285 #undef BIN_DIR
286 #undef PACKAGE_DIR
287
288 /* Default endorsed standards directory. */
289 {
290 #define ENDORSED_DIR "\\lib\\endorsed"
291 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
292 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
293 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
294 Arguments::set_endorsed_dirs(buf);
295 #undef ENDORSED_DIR
296 }
297
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
302
303 // Done
304 return;
305 }
306
307 void os::breakpoint() {
308 DebugBreak();
309 }
310
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
315
316 /*
317 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 * So far, this method is only used by Native Memory Tracking, which is
319 * only supported on Windows XP or later.
320 */
321
322 int os::get_native_stack(address* stack, int frames, int toSkip) {
323 #ifdef _NMT_NOINLINE_
324 toSkip ++;
325 #endif
326 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
327 (PVOID*)stack, NULL);
328 for (int index = captured; index < frames; index ++) {
329 stack[index] = NULL;
330 }
331 return captured;
332 }
333
334
335 // os::current_stack_base()
336 //
337 // Returns the base of the stack, which is the stack's
338 // starting address. This function must be called
339 // while running on the stack of the thread being queried.
340
341 address os::current_stack_base() {
342 MEMORY_BASIC_INFORMATION minfo;
343 address stack_bottom;
344 size_t stack_size;
345
346 VirtualQuery(&minfo, &minfo, sizeof(minfo));
347 stack_bottom = (address)minfo.AllocationBase;
348 stack_size = minfo.RegionSize;
349
350 // Add up the sizes of all the regions with the same
351 // AllocationBase.
352 while( 1 )
353 {
354 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
355 if ( stack_bottom == (address)minfo.AllocationBase )
356 stack_size += minfo.RegionSize;
357 else
358 break;
359 }
360
361 #ifdef _M_IA64
362 // IA64 has memory and register stacks
363 //
364 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
365 // at thread creation (1MB backing store growing upwards, 1MB memory stack
366 // growing downwards, 2MB summed up)
367 //
368 // ...
369 // ------- top of stack (high address) -----
370 // |
371 // | 1MB
372 // | Backing Store (Register Stack)
373 // |
374 // | / \
375 // | |
376 // | |
377 // | |
378 // ------------------------ stack base -----
379 // | 1MB
380 // | Memory Stack
381 // |
382 // | |
383 // | |
384 // | |
385 // | \ /
386 // |
387 // ----- bottom of stack (low address) -----
388 // ...
389
390 stack_size = stack_size / 2;
391 #endif
392 return stack_bottom + stack_size;
393 }
394
395 size_t os::current_stack_size() {
396 size_t sz;
397 MEMORY_BASIC_INFORMATION minfo;
398 VirtualQuery(&minfo, &minfo, sizeof(minfo));
399 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
400 return sz;
401 }
402
403 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
404 const struct tm* time_struct_ptr = localtime(clock);
405 if (time_struct_ptr != NULL) {
406 *res = *time_struct_ptr;
407 return res;
408 }
409 return NULL;
410 }
411
412 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
413
414 // Thread start routine for all new Java threads
415 static unsigned __stdcall java_start(Thread* thread) {
416 // Try to randomize the cache line index of hot stack frames.
417 // This helps when threads of the same stack traces evict each other's
418 // cache lines. The threads can be either from the same JVM instance, or
419 // from different JVM instances. The benefit is especially true for
420 // processors with hyperthreading technology.
421 static int counter = 0;
422 int pid = os::current_process_id();
423 _alloca(((pid ^ counter++) & 7) * 128);
424
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
427
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
434
435
436 // Install a win32 structured exception handler around every thread created
437 // by VM, so VM can genrate error dump when an exception occurred in non-
438 // Java thread (e.g. VM thread).
439 __try {
440 thread->run();
441 } __except(topLevelExceptionFilter(
442 (_EXCEPTION_POINTERS*)_exception_info())) {
443 // Nothing to do.
444 }
445
446 // One less thread is executing
447 // When the VMThread gets here, the main thread may have already exited
448 // which frees the CodeHeap containing the Atomic::add code
449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
451 }
452
453 return 0;
454 }
455
456 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
457 // Allocate the OSThread object
458 OSThread* osthread = new OSThread(NULL, NULL);
459 if (osthread == NULL) return NULL;
460
461 // Initialize support for Java interrupts
462 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
463 if (interrupt_event == NULL) {
464 delete osthread;
465 return NULL;
466 }
467 osthread->set_interrupt_event(interrupt_event);
468
469 // Store info on the Win32 thread into the OSThread
470 osthread->set_thread_handle(thread_handle);
471 osthread->set_thread_id(thread_id);
472
473 if (UseNUMA) {
474 int lgrp_id = os::numa_get_group_id();
475 if (lgrp_id != -1) {
476 thread->set_lgrp_id(lgrp_id);
477 }
478 }
479
480 // Initial thread state is INITIALIZED, not SUSPENDED
481 osthread->set_state(INITIALIZED);
482
483 return osthread;
484 }
485
486
487 bool os::create_attached_thread(JavaThread* thread) {
488 #ifdef ASSERT
489 thread->verify_not_published();
490 #endif
491 HANDLE thread_h;
492 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
493 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
494 fatal("DuplicateHandle failed\n");
495 }
496 OSThread* osthread = create_os_thread(thread, thread_h,
497 (int)current_thread_id());
498 if (osthread == NULL) {
499 return false;
500 }
501
502 // Initial thread state is RUNNABLE
503 osthread->set_state(RUNNABLE);
504
505 thread->set_osthread(osthread);
506 return true;
507 }
508
509 bool os::create_main_thread(JavaThread* thread) {
510 #ifdef ASSERT
511 thread->verify_not_published();
512 #endif
513 if (_starting_thread == NULL) {
514 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
515 if (_starting_thread == NULL) {
516 return false;
517 }
518 }
519
520 // The primordial thread is runnable from the start)
521 _starting_thread->set_state(RUNNABLE);
522
523 thread->set_osthread(_starting_thread);
524 return true;
525 }
526
527 // Allocate and initialize a new OSThread
528 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
529 unsigned thread_id;
530
531 // Allocate the OSThread object
532 OSThread* osthread = new OSThread(NULL, NULL);
533 if (osthread == NULL) {
534 return false;
535 }
536
537 // Initialize support for Java interrupts
538 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
539 if (interrupt_event == NULL) {
540 delete osthread;
541 return NULL;
542 }
543 osthread->set_interrupt_event(interrupt_event);
544 osthread->set_interrupted(false);
545
546 thread->set_osthread(osthread);
547
548 if (stack_size == 0) {
549 switch (thr_type) {
550 case os::java_thread:
551 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
552 if (JavaThread::stack_size_at_create() > 0)
553 stack_size = JavaThread::stack_size_at_create();
554 break;
555 case os::compiler_thread:
556 if (CompilerThreadStackSize > 0) {
557 stack_size = (size_t)(CompilerThreadStackSize * K);
558 break;
559 } // else fall through:
560 // use VMThreadStackSize if CompilerThreadStackSize is not defined
561 case os::vm_thread:
562 case os::pgc_thread:
563 case os::cgc_thread:
564 case os::watcher_thread:
565 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
566 break;
567 }
568 }
569
570 // Create the Win32 thread
571 //
572 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
573 // does not specify stack size. Instead, it specifies the size of
574 // initially committed space. The stack size is determined by
575 // PE header in the executable. If the committed "stack_size" is larger
576 // than default value in the PE header, the stack is rounded up to the
577 // nearest multiple of 1MB. For example if the launcher has default
578 // stack size of 320k, specifying any size less than 320k does not
579 // affect the actual stack size at all, it only affects the initial
580 // commitment. On the other hand, specifying 'stack_size' larger than
581 // default value may cause significant increase in memory usage, because
582 // not only the stack space will be rounded up to MB, but also the
583 // entire space is committed upfront.
584 //
585 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
586 // for CreateThread() that can treat 'stack_size' as stack size. However we
587 // are not supposed to call CreateThread() directly according to MSDN
588 // document because JVM uses C runtime library. The good news is that the
589 // flag appears to work with _beginthredex() as well.
590
591 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
592 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
593 #endif
594
595 HANDLE thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
601 &thread_id);
602 if (thread_handle == NULL) {
603 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
604 // without the flag.
605 thread_handle =
606 (HANDLE)_beginthreadex(NULL,
607 (unsigned)stack_size,
608 (unsigned (__stdcall *)(void*)) java_start,
609 thread,
610 CREATE_SUSPENDED,
611 &thread_id);
612 }
613 if (thread_handle == NULL) {
614 // Need to clean up stuff we've allocated so far
615 CloseHandle(osthread->interrupt_event());
616 thread->set_osthread(NULL);
617 delete osthread;
618 return NULL;
619 }
620
621 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
622
623 // Store info on the Win32 thread into the OSThread
624 osthread->set_thread_handle(thread_handle);
625 osthread->set_thread_id(thread_id);
626
627 // Initial thread state is INITIALIZED, not SUSPENDED
628 osthread->set_state(INITIALIZED);
629
630 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
631 return true;
632 }
633
634
635 // Free Win32 resources related to the OSThread
636 void os::free_thread(OSThread* osthread) {
637 assert(osthread != NULL, "osthread not set");
638 CloseHandle(osthread->thread_handle());
639 CloseHandle(osthread->interrupt_event());
640 delete osthread;
641 }
642
643
644 static int has_performance_count = 0;
645 static jlong first_filetime;
646 static jlong initial_performance_count;
647 static jlong performance_frequency;
648
649
650 jlong as_long(LARGE_INTEGER x) {
651 jlong result = 0; // initialization to avoid warning
652 set_high(&result, x.HighPart);
653 set_low(&result, x.LowPart);
654 return result;
655 }
656
657
658 jlong os::elapsed_counter() {
659 LARGE_INTEGER count;
660 if (has_performance_count) {
661 QueryPerformanceCounter(&count);
662 return as_long(count) - initial_performance_count;
663 } else {
664 FILETIME wt;
665 GetSystemTimeAsFileTime(&wt);
666 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
667 }
668 }
669
670
671 jlong os::elapsed_frequency() {
672 if (has_performance_count) {
673 return performance_frequency;
674 } else {
675 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
676 return 10000000;
677 }
678 }
679
680
681 julong os::available_memory() {
682 return win32::available_memory();
683 }
684
685 julong os::win32::available_memory() {
686 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
687 // value if total memory is larger than 4GB
688 MEMORYSTATUSEX ms;
689 ms.dwLength = sizeof(ms);
690 GlobalMemoryStatusEx(&ms);
691
692 return (julong)ms.ullAvailPhys;
693 }
694
695 julong os::physical_memory() {
696 return win32::physical_memory();
697 }
698
699 bool os::has_allocatable_memory_limit(julong* limit) {
700 MEMORYSTATUSEX ms;
701 ms.dwLength = sizeof(ms);
702 GlobalMemoryStatusEx(&ms);
703 #ifdef _LP64
704 *limit = (julong)ms.ullAvailVirtual;
705 return true;
706 #else
707 // Limit to 1400m because of the 2gb address space wall
708 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
709 return true;
710 #endif
711 }
712
713 // VC6 lacks DWORD_PTR
714 #if _MSC_VER < 1300
715 typedef UINT_PTR DWORD_PTR;
716 #endif
717
718 int os::active_processor_count() {
719 // User has overridden the number of active processors
720 if (ActiveProcessorCount > 0) {
721 if (PrintActiveCpus) {
722 tty->print_cr("active_processor_count: "
723 "active processor count set by user : %d",
724 ActiveProcessorCount);
725 }
726 return ActiveProcessorCount;
727 }
728
729 DWORD_PTR lpProcessAffinityMask = 0;
730 DWORD_PTR lpSystemAffinityMask = 0;
731 int proc_count = processor_count();
732 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
733 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
734 // Nof active processors is number of bits in process affinity mask
735 int bitcount = 0;
736 while (lpProcessAffinityMask != 0) {
737 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
738 bitcount++;
739 }
740 return bitcount;
741 } else {
742 return proc_count;
743 }
744 }
745
746 void os::set_native_thread_name(const char *name) {
747
748 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
749 //
750 // Note that unfortunately this only works if the process
751 // is already attached to a debugger; debugger must observe
752 // the exception below to show the correct name.
753
754 const DWORD MS_VC_EXCEPTION = 0x406D1388;
755 struct {
756 DWORD dwType; // must be 0x1000
757 LPCSTR szName; // pointer to name (in user addr space)
758 DWORD dwThreadID; // thread ID (-1=caller thread)
759 DWORD dwFlags; // reserved for future use, must be zero
760 } info;
761
762 info.dwType = 0x1000;
763 info.szName = name;
764 info.dwThreadID = -1;
765 info.dwFlags = 0;
766
767 __try {
768 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
769 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
770 }
771
772 bool os::distribute_processes(uint length, uint* distribution) {
773 // Not yet implemented.
774 return false;
775 }
776
777 bool os::bind_to_processor(uint processor_id) {
778 // Not yet implemented.
779 return false;
780 }
781
782 static void initialize_performance_counter() {
783 LARGE_INTEGER count;
784 if (QueryPerformanceFrequency(&count)) {
785 has_performance_count = 1;
786 performance_frequency = as_long(count);
787 QueryPerformanceCounter(&count);
788 initial_performance_count = as_long(count);
789 } else {
790 has_performance_count = 0;
791 FILETIME wt;
792 GetSystemTimeAsFileTime(&wt);
793 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
794 }
795 }
796
797
798 double os::elapsedTime() {
799 return (double) elapsed_counter() / (double) elapsed_frequency();
800 }
801
802
803 // Windows format:
804 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
805 // Java format:
806 // Java standards require the number of milliseconds since 1/1/1970
807
808 // Constant offset - calculated using offset()
809 static jlong _offset = 116444736000000000;
810 // Fake time counter for reproducible results when debugging
811 static jlong fake_time = 0;
812
813 #ifdef ASSERT
814 // Just to be safe, recalculate the offset in debug mode
815 static jlong _calculated_offset = 0;
816 static int _has_calculated_offset = 0;
817
818 jlong offset() {
819 if (_has_calculated_offset) return _calculated_offset;
820 SYSTEMTIME java_origin;
821 java_origin.wYear = 1970;
822 java_origin.wMonth = 1;
823 java_origin.wDayOfWeek = 0; // ignored
824 java_origin.wDay = 1;
825 java_origin.wHour = 0;
826 java_origin.wMinute = 0;
827 java_origin.wSecond = 0;
828 java_origin.wMilliseconds = 0;
829 FILETIME jot;
830 if (!SystemTimeToFileTime(&java_origin, &jot)) {
831 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
832 }
833 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
834 _has_calculated_offset = 1;
835 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
836 return _calculated_offset;
837 }
838 #else
839 jlong offset() {
840 return _offset;
841 }
842 #endif
843
844 jlong windows_to_java_time(FILETIME wt) {
845 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
846 return (a - offset()) / 10000;
847 }
848
849 FILETIME java_to_windows_time(jlong l) {
850 jlong a = (l * 10000) + offset();
851 FILETIME result;
852 result.dwHighDateTime = high(a);
853 result.dwLowDateTime = low(a);
854 return result;
855 }
856
857 bool os::supports_vtime() { return true; }
858 bool os::enable_vtime() { return false; }
859 bool os::vtime_enabled() { return false; }
860
861 double os::elapsedVTime() {
862 FILETIME created;
863 FILETIME exited;
864 FILETIME kernel;
865 FILETIME user;
866 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
867 // the resolution of windows_to_java_time() should be sufficient (ms)
868 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
869 } else {
870 return elapsedTime();
871 }
872 }
873
874 jlong os::javaTimeMillis() {
875 if (UseFakeTimers) {
876 return fake_time++;
877 } else {
878 FILETIME wt;
879 GetSystemTimeAsFileTime(&wt);
880 return windows_to_java_time(wt);
881 }
882 }
883
884 jlong os::javaTimeNanos() {
885 if (!has_performance_count) {
886 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
887 } else {
888 LARGE_INTEGER current_count;
889 QueryPerformanceCounter(¤t_count);
890 double current = as_long(current_count);
891 double freq = performance_frequency;
892 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
893 return time;
894 }
895 }
896
897 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
898 if (!has_performance_count) {
899 // javaTimeMillis() doesn't have much percision,
900 // but it is not going to wrap -- so all 64 bits
901 info_ptr->max_value = ALL_64_BITS;
902
903 // this is a wall clock timer, so may skip
904 info_ptr->may_skip_backward = true;
905 info_ptr->may_skip_forward = true;
906 } else {
907 jlong freq = performance_frequency;
908 if (freq < NANOSECS_PER_SEC) {
909 // the performance counter is 64 bits and we will
910 // be multiplying it -- so no wrap in 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912 } else if (freq > NANOSECS_PER_SEC) {
913 // use the max value the counter can reach to
914 // determine the max value which could be returned
915 julong max_counter = (julong)ALL_64_BITS;
916 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
917 } else {
918 // the performance counter is 64 bits and we will
919 // be using it directly -- so no wrap in 64 bits
920 info_ptr->max_value = ALL_64_BITS;
921 }
922
923 // using a counter, so no skipping
924 info_ptr->may_skip_backward = false;
925 info_ptr->may_skip_forward = false;
926 }
927 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
928 }
929
930 char* os::local_time_string(char *buf, size_t buflen) {
931 SYSTEMTIME st;
932 GetLocalTime(&st);
933 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
934 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
935 return buf;
936 }
937
938 bool os::getTimesSecs(double* process_real_time,
939 double* process_user_time,
940 double* process_system_time) {
941 HANDLE h_process = GetCurrentProcess();
942 FILETIME create_time, exit_time, kernel_time, user_time;
943 BOOL result = GetProcessTimes(h_process,
944 &create_time,
945 &exit_time,
946 &kernel_time,
947 &user_time);
948 if (result != 0) {
949 FILETIME wt;
950 GetSystemTimeAsFileTime(&wt);
951 jlong rtc_millis = windows_to_java_time(wt);
952 jlong user_millis = windows_to_java_time(user_time);
953 jlong system_millis = windows_to_java_time(kernel_time);
954 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
955 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
956 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
957 return true;
958 } else {
959 return false;
960 }
961 }
962
963 void os::shutdown() {
964
965 // allow PerfMemory to attempt cleanup of any persistent resources
966 perfMemory_exit();
967
968 // flush buffered output, finish log files
969 ostream_abort();
970
971 // Check for abort hook
972 abort_hook_t abort_hook = Arguments::abort_hook();
973 if (abort_hook != NULL) {
974 abort_hook();
975 }
976 }
977
978
979 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
980 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
981
982 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
983 HINSTANCE dbghelp;
984 EXCEPTION_POINTERS ep;
985 MINIDUMP_EXCEPTION_INFORMATION mei;
986 MINIDUMP_EXCEPTION_INFORMATION* pmei;
987
988 HANDLE hProcess = GetCurrentProcess();
989 DWORD processId = GetCurrentProcessId();
990 HANDLE dumpFile;
991 MINIDUMP_TYPE dumpType;
992 static const char* cwd;
993
994 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
995 #ifndef ASSERT
996 // If running on a client version of Windows and user has not explicitly enabled dumping
997 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
998 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
999 return;
1000 // If running on a server version of Windows and user has explictly disabled dumping
1001 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1002 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1003 return;
1004 }
1005 #else
1006 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1007 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1008 return;
1009 }
1010 #endif
1011
1012 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1013
1014 if (dbghelp == NULL) {
1015 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1016 return;
1017 }
1018
1019 _MiniDumpWriteDump = CAST_TO_FN_PTR(
1020 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
1021 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
1022 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
1023
1024 if (_MiniDumpWriteDump == NULL) {
1025 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1026 return;
1027 }
1028
1029 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1030
1031 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1032 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1033 #if API_VERSION_NUMBER >= 11
1034 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1035 MiniDumpWithUnloadedModules);
1036 #endif
1037
1038 cwd = get_current_directory(NULL, 0);
1039 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1040 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1041
1042 if (dumpFile == INVALID_HANDLE_VALUE) {
1043 VMError::report_coredump_status("Failed to create file for dumping", false);
1044 return;
1045 }
1046 if (exceptionRecord != NULL && contextRecord != NULL) {
1047 ep.ContextRecord = (PCONTEXT) contextRecord;
1048 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1049
1050 mei.ThreadId = GetCurrentThreadId();
1051 mei.ExceptionPointers = &ep;
1052 pmei = &mei;
1053 } else {
1054 pmei = NULL;
1055 }
1056
1057
1058 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1059 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1060 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1061 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1062 DWORD error = GetLastError();
1063 LPTSTR msgbuf = NULL;
1064
1065 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1066 FORMAT_MESSAGE_FROM_SYSTEM |
1067 FORMAT_MESSAGE_IGNORE_INSERTS,
1068 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1069
1070 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1071 LocalFree(msgbuf);
1072 } else {
1073 // Call to FormatMessage failed, just include the result from GetLastError
1074 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1075 }
1076 VMError::report_coredump_status(buffer, false);
1077 } else {
1078 VMError::report_coredump_status(buffer, true);
1079 }
1080
1081 CloseHandle(dumpFile);
1082 }
1083
1084
1085
1086 void os::abort(bool dump_core)
1087 {
1088 os::shutdown();
1089 // no core dump on Windows
1090 ::exit(1);
1091 }
1092
1093 // Die immediately, no exit hook, no abort hook, no cleanup.
1094 void os::die() {
1095 _exit(-1);
1096 }
1097
1098 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1099 // * dirent_md.c 1.15 00/02/02
1100 //
1101 // The declarations for DIR and struct dirent are in jvm_win32.h.
1102
1103 /* Caller must have already run dirname through JVM_NativePath, which removes
1104 duplicate slashes and converts all instances of '/' into '\\'. */
1105
1106 DIR *
1107 os::opendir(const char *dirname)
1108 {
1109 assert(dirname != NULL, "just checking"); // hotspot change
1110 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1111 DWORD fattr; // hotspot change
1112 char alt_dirname[4] = { 0, 0, 0, 0 };
1113
1114 if (dirp == 0) {
1115 errno = ENOMEM;
1116 return 0;
1117 }
1118
1119 /*
1120 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1121 * as a directory in FindFirstFile(). We detect this case here and
1122 * prepend the current drive name.
1123 */
1124 if (dirname[1] == '\0' && dirname[0] == '\\') {
1125 alt_dirname[0] = _getdrive() + 'A' - 1;
1126 alt_dirname[1] = ':';
1127 alt_dirname[2] = '\\';
1128 alt_dirname[3] = '\0';
1129 dirname = alt_dirname;
1130 }
1131
1132 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1133 if (dirp->path == 0) {
1134 free(dirp, mtInternal);
1135 errno = ENOMEM;
1136 return 0;
1137 }
1138 strcpy(dirp->path, dirname);
1139
1140 fattr = GetFileAttributes(dirp->path);
1141 if (fattr == 0xffffffff) {
1142 free(dirp->path, mtInternal);
1143 free(dirp, mtInternal);
1144 errno = ENOENT;
1145 return 0;
1146 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1147 free(dirp->path, mtInternal);
1148 free(dirp, mtInternal);
1149 errno = ENOTDIR;
1150 return 0;
1151 }
1152
1153 /* Append "*.*", or possibly "\\*.*", to path */
1154 if (dirp->path[1] == ':'
1155 && (dirp->path[2] == '\0'
1156 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1157 /* No '\\' needed for cases like "Z:" or "Z:\" */
1158 strcat(dirp->path, "*.*");
1159 } else {
1160 strcat(dirp->path, "\\*.*");
1161 }
1162
1163 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1164 if (dirp->handle == INVALID_HANDLE_VALUE) {
1165 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1166 free(dirp->path, mtInternal);
1167 free(dirp, mtInternal);
1168 errno = EACCES;
1169 return 0;
1170 }
1171 }
1172 return dirp;
1173 }
1174
1175 struct dirent *
1176 os::readdir(DIR *dirp)
1177 {
1178 assert(dirp != NULL, "just checking"); // hotspot change
1179 if (dirp->handle == INVALID_HANDLE_VALUE) {
1180 return NULL;
1181 }
1182
1183 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1184
1185 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1186 if (GetLastError() == ERROR_INVALID_HANDLE) {
1187 errno = EBADF;
1188 return NULL;
1189 }
1190 FindClose(dirp->handle);
1191 dirp->handle = INVALID_HANDLE_VALUE;
1192 }
1193
1194 return &dirp->dirent;
1195 }
1196
1197 int
1198 os::closedir(DIR *dirp)
1199 {
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, mtInternal);
1209 free(dirp, mtInternal);
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], mtInternal);
1277 }
1278 }
1279 if (pelements != NULL) {
1280 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
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 {
1305 HMODULE hmod;
1306 MODULEINFO minfo;
1307
1308 hmod = GetModuleHandle("NTDLL.DLL");
1309 if ( hmod == NULL ) return false;
1310 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1311 &minfo, sizeof(MODULEINFO)) )
1312 return false;
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 #endif
1321
1322
1323 // Enumerate all modules for a given process ID
1324 //
1325 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1326 // different API for doing this. We use PSAPI.DLL on NT based
1327 // Windows and ToolHelp on 95/98/Me.
1328
1329 // Callback function that is called by enumerate_modules() on
1330 // every DLL module.
1331 // Input parameters:
1332 // int pid,
1333 // char* module_file_name,
1334 // address module_base_addr,
1335 // unsigned module_size,
1336 // void* param
1337 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1338
1339 // enumerate_modules for Windows NT, using PSAPI
1340 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1341 {
1342 HANDLE hProcess ;
1343
1344 # define MAX_NUM_MODULES 128
1345 HMODULE modules[MAX_NUM_MODULES];
1346 static char filename[ MAX_PATH ];
1347 int result = 0;
1348
1349 if (!os::PSApiDll::PSApiAvailable()) {
1350 return 0;
1351 }
1352
1353 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1354 FALSE, pid ) ;
1355 if (hProcess == NULL) return 0;
1356
1357 DWORD size_needed;
1358 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1359 sizeof(modules), &size_needed)) {
1360 CloseHandle( hProcess );
1361 return 0;
1362 }
1363
1364 // number of modules that are currently loaded
1365 int num_modules = size_needed / sizeof(HMODULE);
1366
1367 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1368 // Get Full pathname:
1369 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1370 filename, sizeof(filename))) {
1371 filename[0] = '\0';
1372 }
1373
1374 MODULEINFO modinfo;
1375 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1376 &modinfo, sizeof(modinfo))) {
1377 modinfo.lpBaseOfDll = NULL;
1378 modinfo.SizeOfImage = 0;
1379 }
1380
1381 // Invoke callback function
1382 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1383 modinfo.SizeOfImage, param);
1384 if (result) break;
1385 }
1386
1387 CloseHandle( hProcess ) ;
1388 return result;
1389 }
1390
1391
1392 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1393 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1394 {
1395 HANDLE hSnapShot ;
1396 static MODULEENTRY32 modentry ;
1397 int result = 0;
1398
1399 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1400 return 0;
1401 }
1402
1403 // Get a handle to a Toolhelp snapshot of the system
1404 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1405 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1406 return FALSE ;
1407 }
1408
1409 // iterate through all modules
1410 modentry.dwSize = sizeof(MODULEENTRY32) ;
1411 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1412
1413 while( not_done ) {
1414 // invoke the callback
1415 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1416 modentry.modBaseSize, param);
1417 if (result) break;
1418
1419 modentry.dwSize = sizeof(MODULEENTRY32) ;
1420 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1421 }
1422
1423 CloseHandle(hSnapShot);
1424 return result;
1425 }
1426
1427 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1428 {
1429 // Get current process ID if caller doesn't provide it.
1430 if (!pid) pid = os::current_process_id();
1431
1432 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1433 else return _enumerate_modules_windows(pid, func, param);
1434 }
1435
1436 struct _modinfo {
1437 address addr;
1438 char* full_path; // point to a char buffer
1439 int buflen; // size of the buffer
1440 address base_addr;
1441 };
1442
1443 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1444 unsigned size, void * param) {
1445 struct _modinfo *pmod = (struct _modinfo *)param;
1446 if (!pmod) return -1;
1447
1448 if (base_addr <= pmod->addr &&
1449 base_addr+size > pmod->addr) {
1450 // if a buffer is provided, copy path name to the buffer
1451 if (pmod->full_path) {
1452 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1453 }
1454 pmod->base_addr = base_addr;
1455 return 1;
1456 }
1457 return 0;
1458 }
1459
1460 bool os::dll_address_to_library_name(address addr, char* buf,
1461 int buflen, int* offset) {
1462 // buf is not optional, but offset is optional
1463 assert(buf != NULL, "sanity check");
1464
1465 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1466 // return the full path to the DLL file, sometimes it returns path
1467 // to the corresponding PDB file (debug info); sometimes it only
1468 // returns partial path, which makes life painful.
1469
1470 struct _modinfo mi;
1471 mi.addr = addr;
1472 mi.full_path = buf;
1473 mi.buflen = buflen;
1474 int pid = os::current_process_id();
1475 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1476 // buf already contains path name
1477 if (offset) *offset = addr - mi.base_addr;
1478 return true;
1479 }
1480
1481 buf[0] = '\0';
1482 if (offset) *offset = -1;
1483 return false;
1484 }
1485
1486 bool os::dll_address_to_function_name(address addr, char *buf,
1487 int buflen, int *offset) {
1488 // buf is not optional, but offset is optional
1489 assert(buf != NULL, "sanity check");
1490
1491 if (Decoder::decode(addr, buf, buflen, offset)) {
1492 return true;
1493 }
1494 if (offset != NULL) *offset = -1;
1495 buf[0] = '\0';
1496 return false;
1497 }
1498
1499 // save the start and end address of jvm.dll into param[0] and param[1]
1500 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1501 unsigned size, void * param) {
1502 if (!param) return -1;
1503
1504 if (base_addr <= (address)_locate_jvm_dll &&
1505 base_addr+size > (address)_locate_jvm_dll) {
1506 ((address*)param)[0] = base_addr;
1507 ((address*)param)[1] = base_addr + size;
1508 return 1;
1509 }
1510 return 0;
1511 }
1512
1513 address vm_lib_location[2]; // start and end address of jvm.dll
1514
1515 // check if addr is inside jvm.dll
1516 bool os::address_is_in_vm(address addr) {
1517 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1518 int pid = os::current_process_id();
1519 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1520 assert(false, "Can't find jvm module.");
1521 return false;
1522 }
1523 }
1524
1525 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1526 }
1527
1528 // print module info; param is outputStream*
1529 static int _print_module(int pid, char* fname, address base,
1530 unsigned size, void* param) {
1531 if (!param) return -1;
1532
1533 outputStream* st = (outputStream*)param;
1534
1535 address end_addr = base + size;
1536 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1537 return 0;
1538 }
1539
1540 // Loads .dll/.so and
1541 // in case of error it checks if .dll/.so was built for the
1542 // same architecture as Hotspot is running on
1543 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1544 {
1545 void * result = LoadLibrary(name);
1546 if (result != NULL)
1547 {
1548 return result;
1549 }
1550
1551 DWORD errcode = GetLastError();
1552 if (errcode == ERROR_MOD_NOT_FOUND) {
1553 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1554 ebuf[ebuflen-1]='\0';
1555 return NULL;
1556 }
1557
1558 // Parsing dll below
1559 // If we can read dll-info and find that dll was built
1560 // for an architecture other than Hotspot is running in
1561 // - then print to buffer "DLL was built for a different architecture"
1562 // else call os::lasterror to obtain system error message
1563
1564 // Read system error message into ebuf
1565 // It may or may not be overwritten below (in the for loop and just above)
1566 lasterror(ebuf, (size_t) ebuflen);
1567 ebuf[ebuflen-1]='\0';
1568 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1569 if (file_descriptor<0)
1570 {
1571 return NULL;
1572 }
1573
1574 uint32_t signature_offset;
1575 uint16_t lib_arch=0;
1576 bool failed_to_get_lib_arch=
1577 (
1578 //Go to position 3c in the dll
1579 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1580 ||
1581 // Read loacation of signature
1582 (sizeof(signature_offset)!=
1583 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1584 ||
1585 //Go to COFF File Header in dll
1586 //that is located after"signature" (4 bytes long)
1587 (os::seek_to_file_offset(file_descriptor,
1588 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1589 ||
1590 //Read field that contains code of architecture
1591 // that dll was build for
1592 (sizeof(lib_arch)!=
1593 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1594 );
1595
1596 ::close(file_descriptor);
1597 if (failed_to_get_lib_arch)
1598 {
1599 // file i/o error - report os::lasterror(...) msg
1600 return NULL;
1601 }
1602
1603 typedef struct
1604 {
1605 uint16_t arch_code;
1606 char* arch_name;
1607 } arch_t;
1608
1609 static const arch_t arch_array[]={
1610 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1611 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1612 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1613 };
1614 #if (defined _M_IA64)
1615 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1616 #elif (defined _M_AMD64)
1617 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1618 #elif (defined _M_IX86)
1619 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1620 #else
1621 #error Method os::dll_load requires that one of following \
1622 is defined :_M_IA64,_M_AMD64 or _M_IX86
1623 #endif
1624
1625
1626 // Obtain a string for printf operation
1627 // lib_arch_str shall contain string what platform this .dll was built for
1628 // running_arch_str shall string contain what platform Hotspot was built for
1629 char *running_arch_str=NULL,*lib_arch_str=NULL;
1630 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1631 {
1632 if (lib_arch==arch_array[i].arch_code)
1633 lib_arch_str=arch_array[i].arch_name;
1634 if (running_arch==arch_array[i].arch_code)
1635 running_arch_str=arch_array[i].arch_name;
1636 }
1637
1638 assert(running_arch_str,
1639 "Didn't find runing architecture code in arch_array");
1640
1641 // If the architure is right
1642 // but some other error took place - report os::lasterror(...) msg
1643 if (lib_arch == running_arch)
1644 {
1645 return NULL;
1646 }
1647
1648 if (lib_arch_str!=NULL)
1649 {
1650 ::_snprintf(ebuf, ebuflen-1,
1651 "Can't load %s-bit .dll on a %s-bit platform",
1652 lib_arch_str,running_arch_str);
1653 }
1654 else
1655 {
1656 // don't know what architecture this dll was build for
1657 ::_snprintf(ebuf, ebuflen-1,
1658 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1659 lib_arch,running_arch_str);
1660 }
1661
1662 return NULL;
1663 }
1664
1665
1666 void os::print_dll_info(outputStream *st) {
1667 int pid = os::current_process_id();
1668 st->print_cr("Dynamic libraries:");
1669 enumerate_modules(pid, _print_module, (void *)st);
1670 }
1671
1672 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1673 HANDLE hProcess;
1674
1675 # define MAX_NUM_MODULES 128
1676 HMODULE modules[MAX_NUM_MODULES];
1677 static char filename[MAX_PATH];
1678 int result = 0;
1679
1680 int pid = os::current_process_id();
1681 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1682 FALSE, pid);
1683 if (hProcess == NULL) return 0;
1684
1685 DWORD size_needed;
1686 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1687 CloseHandle(hProcess);
1688 return 0;
1689 }
1690
1691 // number of modules that are currently loaded
1692 int num_modules = size_needed / sizeof(HMODULE);
1693
1694 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1695 // Get Full pathname:
1696 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1697 filename[0] = '\0';
1698 }
1699
1700 MODULEINFO modinfo;
1701 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1702 modinfo.lpBaseOfDll = NULL;
1703 modinfo.SizeOfImage = 0;
1704 }
1705
1706 // Invoke callback function
1707 result = callback(filename, (address)modinfo.lpBaseOfDll,
1708 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1709 if (result) break;
1710 }
1711
1712 CloseHandle(hProcess);
1713 return result;
1714 }
1715
1716 void os::print_os_info_brief(outputStream* st) {
1717 os::print_os_info(st);
1718 }
1719
1720 void os::print_os_info(outputStream* st) {
1721 st->print("OS:");
1722
1723 os::win32::print_windows_version(st);
1724 }
1725
1726 void os::win32::print_windows_version(outputStream* st) {
1727 OSVERSIONINFOEX osvi;
1728 VS_FIXEDFILEINFO *file_info;
1729 TCHAR kernel32_path[MAX_PATH];
1730 UINT len, ret;
1731
1732 // Use the GetVersionEx information to see if we're on a server or
1733 // workstation edition of Windows. Starting with Windows 8.1 we can't
1734 // trust the OS version information returned by this API.
1735 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1736 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1737 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1738 st->print_cr("Call to GetVersionEx failed");
1739 return;
1740 }
1741 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1742
1743 // Get the full path to \Windows\System32\kernel32.dll and use that for
1744 // determining what version of Windows we're running on.
1745 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1746 ret = GetSystemDirectory(kernel32_path, len);
1747 if (ret == 0 || ret > len) {
1748 st->print_cr("Call to GetSystemDirectory failed");
1749 return;
1750 }
1751 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1752
1753 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1754 if (version_size == 0) {
1755 st->print_cr("Call to GetFileVersionInfoSize failed");
1756 return;
1757 }
1758
1759 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1760 if (version_info == NULL) {
1761 st->print_cr("Failed to allocate version_info");
1762 return;
1763 }
1764
1765 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1766 os::free(version_info);
1767 st->print_cr("Call to GetFileVersionInfo failed");
1768 return;
1769 }
1770
1771 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1772 os::free(version_info);
1773 st->print_cr("Call to VerQueryValue failed");
1774 return;
1775 }
1776
1777 int major_version = HIWORD(file_info->dwProductVersionMS);
1778 int minor_version = LOWORD(file_info->dwProductVersionMS);
1779 int build_number = HIWORD(file_info->dwProductVersionLS);
1780 int build_minor = LOWORD(file_info->dwProductVersionLS);
1781 int os_vers = major_version * 1000 + minor_version;
1782 os::free(version_info);
1783
1784 st->print(" Windows ");
1785 switch (os_vers) {
1786
1787 case 6000:
1788 if (is_workstation) {
1789 st->print("Vista");
1790 } else {
1791 st->print("Server 2008");
1792 }
1793 break;
1794
1795 case 6001:
1796 if (is_workstation) {
1797 st->print("7");
1798 } else {
1799 st->print("Server 2008 R2");
1800 }
1801 break;
1802
1803 case 6002:
1804 if (is_workstation) {
1805 st->print("8");
1806 } else {
1807 st->print("Server 2012");
1808 }
1809 break;
1810
1811 case 6003:
1812 if (is_workstation) {
1813 st->print("8.1");
1814 } else {
1815 st->print("Server 2012 R2");
1816 }
1817 break;
1818
1819 case 6004:
1820 if (is_workstation) {
1821 st->print("10");
1822 } else {
1823 // distinguish Windows Server 2016 and 2019 by build number
1824 // Windows server 2019 GA 10/2018 build number is 17763
1825 if (build_number > 17762) {
1826 st->print("Server 2019");
1827 } else {
1828 st->print("Server 2016");
1829 }
1830 }
1831 break;
1832
1833 default:
1834 // Unrecognized windows, print out its major and minor versions
1835 st->print("%d.%d", major_version, minor_version);
1836 break;
1837 }
1838
1839 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1840 // find out whether we are running on 64 bit processor or not
1841 SYSTEM_INFO si;
1842 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1843 os::Kernel32Dll::GetNativeSystemInfo(&si);
1844 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1845 st->print(" , 64 bit");
1846 }
1847
1848 st->print(" Build %d", build_number);
1849 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1850 st->cr();
1851 }
1852
1853 void os::pd_print_cpu_info(outputStream* st) {
1854 // Nothing to do for now.
1855 }
1856
1857 void os::print_memory_info(outputStream* st) {
1858 st->print("Memory:");
1859 st->print(" %dk page", os::vm_page_size()>>10);
1860
1861 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1862 // value if total memory is larger than 4GB
1863 MEMORYSTATUSEX ms;
1864 ms.dwLength = sizeof(ms);
1865 GlobalMemoryStatusEx(&ms);
1866
1867 st->print(", physical %uk", os::physical_memory() >> 10);
1868 st->print("(%uk free)", os::available_memory() >> 10);
1869
1870 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1871 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1872 st->cr();
1873 }
1874
1875 void os::print_siginfo(outputStream *st, void *siginfo) {
1876 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1877 st->print("siginfo:");
1878 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1879
1880 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1881 er->NumberParameters >= 2) {
1882 switch (er->ExceptionInformation[0]) {
1883 case 0: st->print(", reading address"); break;
1884 case 1: st->print(", writing address"); break;
1885 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1886 er->ExceptionInformation[0]);
1887 }
1888 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1889 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1890 er->NumberParameters >= 2 && UseSharedSpaces) {
1891 FileMapInfo* mapinfo = FileMapInfo::current_info();
1892 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1893 st->print("\n\nError accessing class data sharing archive." \
1894 " Mapped file inaccessible during execution, " \
1895 " possible disk/network problem.");
1896 }
1897 } else {
1898 int num = er->NumberParameters;
1899 if (num > 0) {
1900 st->print(", ExceptionInformation=");
1901 for (int i = 0; i < num; i++) {
1902 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1903 }
1904 }
1905 }
1906 st->cr();
1907 }
1908
1909
1910 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1911 #if _MSC_VER >= 1900
1912 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1913 int result = ::vsnprintf(buf, len, fmt, args);
1914 // If an encoding error occurred (result < 0) then it's not clear
1915 // whether the buffer is NUL terminated, so ensure it is.
1916 if ((result < 0) && (len > 0)) {
1917 buf[len - 1] = '\0';
1918 }
1919 return result;
1920 #else
1921 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1922 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1923 // versions. However, when len == 0, avoid _vsnprintf too, and just
1924 // go straight to _vscprintf. The output is going to be truncated in
1925 // that case, except in the unusual case of empty output. More
1926 // importantly, the documentation for various versions of Visual Studio
1927 // are inconsistent about the behavior of _vsnprintf when len == 0,
1928 // including it possibly being an error.
1929 int result = -1;
1930 if (len > 0) {
1931 result = _vsnprintf(buf, len, fmt, args);
1932 // If output (including NUL terminator) is truncated, the buffer
1933 // won't be NUL terminated. Add the trailing NUL specified by C99.
1934 if ((result < 0) || (result >= (int) len)) {
1935 buf[len - 1] = '\0';
1936 }
1937 }
1938 if (result < 0) {
1939 result = _vscprintf(fmt, args);
1940 }
1941 return result;
1942 #endif // _MSC_VER dispatch
1943 }
1944
1945 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1946 // do nothing
1947 }
1948
1949 static char saved_jvm_path[MAX_PATH] = {0};
1950
1951 // Find the full path to the current module, jvm.dll
1952 void os::jvm_path(char *buf, jint buflen) {
1953 // Error checking.
1954 if (buflen < MAX_PATH) {
1955 assert(false, "must use a large-enough buffer");
1956 buf[0] = '\0';
1957 return;
1958 }
1959 // Lazy resolve the path to current module.
1960 if (saved_jvm_path[0] != 0) {
1961 strcpy(buf, saved_jvm_path);
1962 return;
1963 }
1964
1965 buf[0] = '\0';
1966 if (Arguments::created_by_gamma_launcher()) {
1967 // Support for the gamma launcher. Check for an
1968 // JAVA_HOME environment variable
1969 // and fix up the path so it looks like
1970 // libjvm.so is installed there (append a fake suffix
1971 // hotspot/libjvm.so).
1972 char* java_home_var = ::getenv("JAVA_HOME");
1973 if (java_home_var != NULL && java_home_var[0] != 0 &&
1974 strlen(java_home_var) < (size_t)buflen) {
1975
1976 strncpy(buf, java_home_var, buflen);
1977
1978 // determine if this is a legacy image or modules image
1979 // modules image doesn't have "jre" subdirectory
1980 size_t len = strlen(buf);
1981 char* jrebin_p = buf + len;
1982 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1983 if (0 != _access(buf, 0)) {
1984 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1985 }
1986 len = strlen(buf);
1987 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1988 }
1989 }
1990
1991 if(buf[0] == '\0') {
1992 GetModuleFileName(vm_lib_handle, buf, buflen);
1993 }
1994 strncpy(saved_jvm_path, buf, MAX_PATH);
1995 }
1996
1997
1998 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1999 #ifndef _WIN64
2000 st->print("_");
2001 #endif
2002 }
2003
2004
2005 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2006 #ifndef _WIN64
2007 st->print("@%d", args_size * sizeof(int));
2008 #endif
2009 }
2010
2011 // This method is a copy of JDK's sysGetLastErrorString
2012 // from src/windows/hpi/src/system_md.c
2013
2014 size_t os::lasterror(char* buf, size_t len) {
2015 DWORD errval;
2016
2017 if ((errval = GetLastError()) != 0) {
2018 // DOS error
2019 size_t n = (size_t)FormatMessage(
2020 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
2021 NULL,
2022 errval,
2023 0,
2024 buf,
2025 (DWORD)len,
2026 NULL);
2027 if (n > 3) {
2028 // Drop final '.', CR, LF
2029 if (buf[n - 1] == '\n') n--;
2030 if (buf[n - 1] == '\r') n--;
2031 if (buf[n - 1] == '.') n--;
2032 buf[n] = '\0';
2033 }
2034 return n;
2035 }
2036
2037 if (errno != 0) {
2038 // C runtime error that has no corresponding DOS error code
2039 const char* s = strerror(errno);
2040 size_t n = strlen(s);
2041 if (n >= len) n = len - 1;
2042 strncpy(buf, s, n);
2043 buf[n] = '\0';
2044 return n;
2045 }
2046
2047 return 0;
2048 }
2049
2050 int os::get_last_error() {
2051 DWORD error = GetLastError();
2052 if (error == 0)
2053 error = errno;
2054 return (int)error;
2055 }
2056
2057 // sun.misc.Signal
2058 // NOTE that this is a workaround for an apparent kernel bug where if
2059 // a signal handler for SIGBREAK is installed then that signal handler
2060 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
2061 // See bug 4416763.
2062 static void (*sigbreakHandler)(int) = NULL;
2063
2064 static void UserHandler(int sig, void *siginfo, void *context) {
2065 os::signal_notify(sig);
2066 // We need to reinstate the signal handler each time...
2067 os::signal(sig, (void*)UserHandler);
2068 }
2069
2070 void* os::user_handler() {
2071 return (void*) UserHandler;
2072 }
2073
2074 void* os::signal(int signal_number, void* handler) {
2075 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
2076 void (*oldHandler)(int) = sigbreakHandler;
2077 sigbreakHandler = (void (*)(int)) handler;
2078 return (void*) oldHandler;
2079 } else {
2080 return (void*)::signal(signal_number, (void (*)(int))handler);
2081 }
2082 }
2083
2084 void os::signal_raise(int signal_number) {
2085 raise(signal_number);
2086 }
2087
2088 // The Win32 C runtime library maps all console control events other than ^C
2089 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2090 // logoff, and shutdown events. We therefore install our own console handler
2091 // that raises SIGTERM for the latter cases.
2092 //
2093 static BOOL WINAPI consoleHandler(DWORD event) {
2094 switch(event) {
2095 case CTRL_C_EVENT:
2096 if (is_error_reported()) {
2097 // Ctrl-C is pressed during error reporting, likely because the error
2098 // handler fails to abort. Let VM die immediately.
2099 os::die();
2100 }
2101
2102 os::signal_raise(SIGINT);
2103 return TRUE;
2104 break;
2105 case CTRL_BREAK_EVENT:
2106 if (sigbreakHandler != NULL) {
2107 (*sigbreakHandler)(SIGBREAK);
2108 }
2109 return TRUE;
2110 break;
2111 case CTRL_LOGOFF_EVENT: {
2112 // Don't terminate JVM if it is running in a non-interactive session,
2113 // such as a service process.
2114 USEROBJECTFLAGS flags;
2115 HANDLE handle = GetProcessWindowStation();
2116 if (handle != NULL &&
2117 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2118 sizeof( USEROBJECTFLAGS), NULL)) {
2119 // If it is a non-interactive session, let next handler to deal
2120 // with it.
2121 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2122 return FALSE;
2123 }
2124 }
2125 }
2126 case CTRL_CLOSE_EVENT:
2127 case CTRL_SHUTDOWN_EVENT:
2128 os::signal_raise(SIGTERM);
2129 return TRUE;
2130 break;
2131 default:
2132 break;
2133 }
2134 return FALSE;
2135 }
2136
2137 /*
2138 * The following code is moved from os.cpp for making this
2139 * code platform specific, which it is by its very nature.
2140 */
2141
2142 // Return maximum OS signal used + 1 for internal use only
2143 // Used as exit signal for signal_thread
2144 int os::sigexitnum_pd(){
2145 return NSIG;
2146 }
2147
2148 // a counter for each possible signal value, including signal_thread exit signal
2149 static volatile jint pending_signals[NSIG+1] = { 0 };
2150 static HANDLE sig_sem = NULL;
2151
2152 void os::signal_init_pd() {
2153 // Initialize signal structures
2154 memset((void*)pending_signals, 0, sizeof(pending_signals));
2155
2156 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2157
2158 // Programs embedding the VM do not want it to attempt to receive
2159 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2160 // shutdown hooks mechanism introduced in 1.3. For example, when
2161 // the VM is run as part of a Windows NT service (i.e., a servlet
2162 // engine in a web server), the correct behavior is for any console
2163 // control handler to return FALSE, not TRUE, because the OS's
2164 // "final" handler for such events allows the process to continue if
2165 // it is a service (while terminating it if it is not a service).
2166 // To make this behavior uniform and the mechanism simpler, we
2167 // completely disable the VM's usage of these console events if -Xrs
2168 // (=ReduceSignalUsage) is specified. This means, for example, that
2169 // the CTRL-BREAK thread dump mechanism is also disabled in this
2170 // case. See bugs 4323062, 4345157, and related bugs.
2171
2172 if (!ReduceSignalUsage) {
2173 // Add a CTRL-C handler
2174 SetConsoleCtrlHandler(consoleHandler, TRUE);
2175 }
2176 }
2177
2178 void os::signal_notify(int signal_number) {
2179 BOOL ret;
2180 if (sig_sem != NULL) {
2181 Atomic::inc(&pending_signals[signal_number]);
2182 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2183 assert(ret != 0, "ReleaseSemaphore() failed");
2184 }
2185 }
2186
2187 static int check_pending_signals(bool wait_for_signal) {
2188 DWORD ret;
2189 while (true) {
2190 for (int i = 0; i < NSIG + 1; i++) {
2191 jint n = pending_signals[i];
2192 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2193 return i;
2194 }
2195 }
2196 if (!wait_for_signal) {
2197 return -1;
2198 }
2199
2200 JavaThread *thread = JavaThread::current();
2201
2202 ThreadBlockInVM tbivm(thread);
2203
2204 bool threadIsSuspended;
2205 do {
2206 thread->set_suspend_equivalent();
2207 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2208 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2209 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2210
2211 // were we externally suspended while we were waiting?
2212 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2213 if (threadIsSuspended) {
2214 //
2215 // The semaphore has been incremented, but while we were waiting
2216 // another thread suspended us. We don't want to continue running
2217 // while suspended because that would surprise the thread that
2218 // suspended us.
2219 //
2220 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2221 assert(ret != 0, "ReleaseSemaphore() failed");
2222
2223 thread->java_suspend_self();
2224 }
2225 } while (threadIsSuspended);
2226 }
2227 }
2228
2229 int os::signal_lookup() {
2230 return check_pending_signals(false);
2231 }
2232
2233 int os::signal_wait() {
2234 return check_pending_signals(true);
2235 }
2236
2237 // Implicit OS exception handling
2238
2239 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2240 JavaThread* thread = JavaThread::current();
2241 // Save pc in thread
2242 #ifdef _M_IA64
2243 // Do not blow up if no thread info available.
2244 if (thread) {
2245 // Saving PRECISE pc (with slot information) in thread.
2246 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2247 // Convert precise PC into "Unix" format
2248 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2249 thread->set_saved_exception_pc((address)precise_pc);
2250 }
2251 // Set pc to handler
2252 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2253 // Clear out psr.ri (= Restart Instruction) in order to continue
2254 // at the beginning of the target bundle.
2255 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2256 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2257 #else
2258 #ifdef _M_AMD64
2259 // Do not blow up if no thread info available.
2260 if (thread) {
2261 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2262 }
2263 // Set pc to handler
2264 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2265 #else
2266 // Do not blow up if no thread info available.
2267 if (thread) {
2268 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2269 }
2270 // Set pc to handler
2271 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2272 #endif
2273 #endif
2274
2275 // Continue the execution
2276 return EXCEPTION_CONTINUE_EXECUTION;
2277 }
2278
2279
2280 // Used for PostMortemDump
2281 extern "C" void safepoints();
2282 extern "C" void find(int x);
2283 extern "C" void events();
2284
2285 // According to Windows API documentation, an illegal instruction sequence should generate
2286 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2287 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2288 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2289
2290 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2291
2292 // From "Execution Protection in the Windows Operating System" draft 0.35
2293 // Once a system header becomes available, the "real" define should be
2294 // included or copied here.
2295 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2296
2297 // Handle NAT Bit consumption on IA64.
2298 #ifdef _M_IA64
2299 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2300 #endif
2301
2302 // Windows Vista/2008 heap corruption check
2303 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2304
2305 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2306 // C++ compiler contain this error code. Because this is a compiler-generated
2307 // error, the code is not listed in the Win32 API header files.
2308 // The code is actually a cryptic mnemonic device, with the initial "E"
2309 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2310 // ASCII values of "msc".
2311
2312 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2313
2314 #define def_excpt(val) { #val, (val) }
2315
2316 static const struct { char* name; uint number; } exceptlabels[] = {
2317 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2318 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2319 def_excpt(EXCEPTION_BREAKPOINT),
2320 def_excpt(EXCEPTION_SINGLE_STEP),
2321 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2322 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2323 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2324 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2325 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2326 def_excpt(EXCEPTION_FLT_OVERFLOW),
2327 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2328 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2329 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2330 def_excpt(EXCEPTION_INT_OVERFLOW),
2331 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2332 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2333 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2334 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2335 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2336 def_excpt(EXCEPTION_STACK_OVERFLOW),
2337 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2338 def_excpt(EXCEPTION_GUARD_PAGE),
2339 def_excpt(EXCEPTION_INVALID_HANDLE),
2340 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2341 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2342 #ifdef _M_IA64
2343 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2344 #endif
2345 };
2346
2347 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2348 uint code = static_cast<uint>(exception_code);
2349 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2350 if (exceptlabels[i].number == code) {
2351 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2352 return buf;
2353 }
2354 }
2355
2356 return NULL;
2357 }
2358
2359 //-----------------------------------------------------------------------------
2360 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2361 // handle exception caused by idiv; should only happen for -MinInt/-1
2362 // (division by zero is handled explicitly)
2363 #ifdef _M_IA64
2364 assert(0, "Fix Handle_IDiv_Exception");
2365 #else
2366 #ifdef _M_AMD64
2367 PCONTEXT ctx = exceptionInfo->ContextRecord;
2368 address pc = (address)ctx->Rip;
2369 assert(pc[0] == 0xF7, "not an idiv opcode");
2370 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2371 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2372 // set correct result values and continue after idiv instruction
2373 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2374 ctx->Rax = (DWORD64)min_jint; // result
2375 ctx->Rdx = (DWORD64)0; // remainder
2376 // Continue the execution
2377 #else
2378 PCONTEXT ctx = exceptionInfo->ContextRecord;
2379 address pc = (address)ctx->Eip;
2380 assert(pc[0] == 0xF7, "not an idiv opcode");
2381 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2382 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2383 // set correct result values and continue after idiv instruction
2384 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2385 ctx->Eax = (DWORD)min_jint; // result
2386 ctx->Edx = (DWORD)0; // remainder
2387 // Continue the execution
2388 #endif
2389 #endif
2390 return EXCEPTION_CONTINUE_EXECUTION;
2391 }
2392
2393 #ifndef _WIN64
2394 //-----------------------------------------------------------------------------
2395 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2396 // handle exception caused by native method modifying control word
2397 PCONTEXT ctx = exceptionInfo->ContextRecord;
2398 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2399
2400 switch (exception_code) {
2401 case EXCEPTION_FLT_DENORMAL_OPERAND:
2402 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2403 case EXCEPTION_FLT_INEXACT_RESULT:
2404 case EXCEPTION_FLT_INVALID_OPERATION:
2405 case EXCEPTION_FLT_OVERFLOW:
2406 case EXCEPTION_FLT_STACK_CHECK:
2407 case EXCEPTION_FLT_UNDERFLOW:
2408 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2409 if (fp_control_word != ctx->FloatSave.ControlWord) {
2410 // Restore FPCW and mask out FLT exceptions
2411 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2412 // Mask out pending FLT exceptions
2413 ctx->FloatSave.StatusWord &= 0xffffff00;
2414 return EXCEPTION_CONTINUE_EXECUTION;
2415 }
2416 }
2417
2418 if (prev_uef_handler != NULL) {
2419 // We didn't handle this exception so pass it to the previous
2420 // UnhandledExceptionFilter.
2421 return (prev_uef_handler)(exceptionInfo);
2422 }
2423
2424 return EXCEPTION_CONTINUE_SEARCH;
2425 }
2426 #else //_WIN64
2427 /*
2428 On Windows, the mxcsr control bits are non-volatile across calls
2429 See also CR 6192333
2430 If EXCEPTION_FLT_* happened after some native method modified
2431 mxcsr - it is not a jvm fault.
2432 However should we decide to restore of mxcsr after a faulty
2433 native method we can uncomment following code
2434 jint MxCsr = INITIAL_MXCSR;
2435 // we can't use StubRoutines::addr_mxcsr_std()
2436 // because in Win64 mxcsr is not saved there
2437 if (MxCsr != ctx->MxCsr) {
2438 ctx->MxCsr = MxCsr;
2439 return EXCEPTION_CONTINUE_EXECUTION;
2440 }
2441
2442 */
2443 #endif // _WIN64
2444
2445
2446 static inline void report_error(Thread* t, DWORD exception_code,
2447 address addr, void* siginfo, void* context) {
2448 VMError err(t, exception_code, addr, siginfo, context);
2449 err.report_and_die();
2450
2451 // If UseOsErrorReporting, this will return here and save the error file
2452 // somewhere where we can find it in the minidump.
2453 }
2454
2455 //-----------------------------------------------------------------------------
2456 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2457 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2458 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2459 #ifdef _M_IA64
2460 // On Itanium, we need the "precise pc", which has the slot number coded
2461 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2462 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2463 // Convert the pc to "Unix format", which has the slot number coded
2464 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2465 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2466 // information is saved in the Unix format.
2467 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2468 #else
2469 #ifdef _M_AMD64
2470 address pc = (address) exceptionInfo->ContextRecord->Rip;
2471 #else
2472 address pc = (address) exceptionInfo->ContextRecord->Eip;
2473 #endif
2474 #endif
2475 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2476
2477 // Handle SafeFetch32 and SafeFetchN exceptions.
2478 if (StubRoutines::is_safefetch_fault(pc)) {
2479 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2480 }
2481
2482 #ifndef _WIN64
2483 // Execution protection violation - win32 running on AMD64 only
2484 // Handled first to avoid misdiagnosis as a "normal" access violation;
2485 // This is safe to do because we have a new/unique ExceptionInformation
2486 // code for this condition.
2487 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2488 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2489 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2490 address addr = (address) exceptionRecord->ExceptionInformation[1];
2491
2492 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2493 int page_size = os::vm_page_size();
2494
2495 // Make sure the pc and the faulting address are sane.
2496 //
2497 // If an instruction spans a page boundary, and the page containing
2498 // the beginning of the instruction is executable but the following
2499 // page is not, the pc and the faulting address might be slightly
2500 // different - we still want to unguard the 2nd page in this case.
2501 //
2502 // 15 bytes seems to be a (very) safe value for max instruction size.
2503 bool pc_is_near_addr =
2504 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2505 bool instr_spans_page_boundary =
2506 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2507 (intptr_t) page_size) > 0);
2508
2509 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2510 static volatile address last_addr =
2511 (address) os::non_memory_address_word();
2512
2513 // In conservative mode, don't unguard unless the address is in the VM
2514 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2515 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2516
2517 // Set memory to RWX and retry
2518 address page_start =
2519 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2520 bool res = os::protect_memory((char*) page_start, page_size,
2521 os::MEM_PROT_RWX);
2522
2523 if (PrintMiscellaneous && Verbose) {
2524 char buf[256];
2525 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2526 "at " INTPTR_FORMAT
2527 ", unguarding " INTPTR_FORMAT ": %s", addr,
2528 page_start, (res ? "success" : strerror(errno)));
2529 tty->print_raw_cr(buf);
2530 }
2531
2532 // Set last_addr so if we fault again at the same address, we don't
2533 // end up in an endless loop.
2534 //
2535 // There are two potential complications here. Two threads trapping
2536 // at the same address at the same time could cause one of the
2537 // threads to think it already unguarded, and abort the VM. Likely
2538 // very rare.
2539 //
2540 // The other race involves two threads alternately trapping at
2541 // different addresses and failing to unguard the page, resulting in
2542 // an endless loop. This condition is probably even more unlikely
2543 // than the first.
2544 //
2545 // Although both cases could be avoided by using locks or thread
2546 // local last_addr, these solutions are unnecessary complication:
2547 // this handler is a best-effort safety net, not a complete solution.
2548 // It is disabled by default and should only be used as a workaround
2549 // in case we missed any no-execute-unsafe VM code.
2550
2551 last_addr = addr;
2552
2553 return EXCEPTION_CONTINUE_EXECUTION;
2554 }
2555 }
2556
2557 // Last unguard failed or not unguarding
2558 tty->print_raw_cr("Execution protection violation");
2559 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2560 exceptionInfo->ContextRecord);
2561 return EXCEPTION_CONTINUE_SEARCH;
2562 }
2563 }
2564 #endif // _WIN64
2565
2566 // Check to see if we caught the safepoint code in the
2567 // process of write protecting the memory serialization page.
2568 // It write enables the page immediately after protecting it
2569 // so just return.
2570 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2571 JavaThread* thread = (JavaThread*) t;
2572 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2573 address addr = (address) exceptionRecord->ExceptionInformation[1];
2574 if ( os::is_memory_serialize_page(thread, addr) ) {
2575 // Block current thread until the memory serialize page permission restored.
2576 os::block_on_serialize_page_trap();
2577 return EXCEPTION_CONTINUE_EXECUTION;
2578 }
2579 }
2580
2581 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2582 VM_Version::is_cpuinfo_segv_addr(pc)) {
2583 // Verify that OS save/restore AVX registers.
2584 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2585 }
2586
2587 if (t != NULL && t->is_Java_thread()) {
2588 JavaThread* thread = (JavaThread*) t;
2589 bool in_java = thread->thread_state() == _thread_in_Java;
2590
2591 // Handle potential stack overflows up front.
2592 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2593 if (os::uses_stack_guard_pages()) {
2594 #ifdef _M_IA64
2595 // Use guard page for register stack.
2596 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2597 address addr = (address) exceptionRecord->ExceptionInformation[1];
2598 // Check for a register stack overflow on Itanium
2599 if (thread->addr_inside_register_stack_red_zone(addr)) {
2600 // Fatal red zone violation happens if the Java program
2601 // catches a StackOverflow error and does so much processing
2602 // that it runs beyond the unprotected yellow guard zone. As
2603 // a result, we are out of here.
2604 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2605 } else if(thread->addr_inside_register_stack(addr)) {
2606 // Disable the yellow zone which sets the state that
2607 // we've got a stack overflow problem.
2608 if (thread->stack_yellow_zone_enabled()) {
2609 thread->disable_stack_yellow_zone();
2610 }
2611 // Give us some room to process the exception.
2612 thread->disable_register_stack_guard();
2613 // Tracing with +Verbose.
2614 if (Verbose) {
2615 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2616 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2617 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2618 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2619 thread->register_stack_base(),
2620 thread->register_stack_base() + thread->stack_size());
2621 }
2622
2623 // Reguard the permanent register stack red zone just to be sure.
2624 // We saw Windows silently disabling this without telling us.
2625 thread->enable_register_stack_red_zone();
2626
2627 return Handle_Exception(exceptionInfo,
2628 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2629 }
2630 #endif
2631 if (thread->stack_yellow_zone_enabled()) {
2632 // Yellow zone violation. The o/s has unprotected the first yellow
2633 // zone page for us. Note: must call disable_stack_yellow_zone to
2634 // update the enabled status, even if the zone contains only one page.
2635 thread->disable_stack_yellow_zone();
2636 // If not in java code, return and hope for the best.
2637 return in_java ? Handle_Exception(exceptionInfo,
2638 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2639 : EXCEPTION_CONTINUE_EXECUTION;
2640 } else {
2641 // Fatal red zone violation.
2642 thread->disable_stack_red_zone();
2643 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2644 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2645 exceptionInfo->ContextRecord);
2646 return EXCEPTION_CONTINUE_SEARCH;
2647 }
2648 } else if (in_java) {
2649 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2650 // a one-time-only guard page, which it has released to us. The next
2651 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2652 return Handle_Exception(exceptionInfo,
2653 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2654 } else {
2655 // Can only return and hope for the best. Further stack growth will
2656 // result in an ACCESS_VIOLATION.
2657 return EXCEPTION_CONTINUE_EXECUTION;
2658 }
2659 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2660 // Either stack overflow or null pointer exception.
2661 if (in_java) {
2662 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2663 address addr = (address) exceptionRecord->ExceptionInformation[1];
2664 address stack_end = thread->stack_base() - thread->stack_size();
2665 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2666 // Stack overflow.
2667 assert(!os::uses_stack_guard_pages(),
2668 "should be caught by red zone code above.");
2669 return Handle_Exception(exceptionInfo,
2670 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2671 }
2672 //
2673 // Check for safepoint polling and implicit null
2674 // We only expect null pointers in the stubs (vtable)
2675 // the rest are checked explicitly now.
2676 //
2677 CodeBlob* cb = CodeCache::find_blob(pc);
2678 if (cb != NULL) {
2679 if (os::is_poll_address(addr)) {
2680 address stub = SharedRuntime::get_poll_stub(pc);
2681 return Handle_Exception(exceptionInfo, stub);
2682 }
2683 }
2684 {
2685 #ifdef _WIN64
2686 //
2687 // If it's a legal stack address map the entire region in
2688 //
2689 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2690 address addr = (address) exceptionRecord->ExceptionInformation[1];
2691 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2692 addr = (address)((uintptr_t)addr &
2693 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2694 os::commit_memory((char *)addr, thread->stack_base() - addr,
2695 !ExecMem);
2696 return EXCEPTION_CONTINUE_EXECUTION;
2697 }
2698 else
2699 #endif
2700 {
2701 // Null pointer exception.
2702 #ifdef _M_IA64
2703 // Process implicit null checks in compiled code. Note: Implicit null checks
2704 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2705 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2706 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2707 // Handle implicit null check in UEP method entry
2708 if (cb && (cb->is_frame_complete_at(pc) ||
2709 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2710 if (Verbose) {
2711 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2712 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2713 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2714 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2715 *(bundle_start + 1), *bundle_start);
2716 }
2717 return Handle_Exception(exceptionInfo,
2718 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2719 }
2720 }
2721
2722 // Implicit null checks were processed above. Hence, we should not reach
2723 // here in the usual case => die!
2724 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2725 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2726 exceptionInfo->ContextRecord);
2727 return EXCEPTION_CONTINUE_SEARCH;
2728
2729 #else // !IA64
2730
2731 // Windows 98 reports faulting addresses incorrectly
2732 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2733 !os::win32::is_nt()) {
2734 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2735 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2736 }
2737 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2738 exceptionInfo->ContextRecord);
2739 return EXCEPTION_CONTINUE_SEARCH;
2740 #endif
2741 }
2742 }
2743 }
2744
2745 #ifdef _WIN64
2746 // Special care for fast JNI field accessors.
2747 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2748 // in and the heap gets shrunk before the field access.
2749 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2750 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2751 if (addr != (address)-1) {
2752 return Handle_Exception(exceptionInfo, addr);
2753 }
2754 }
2755 #endif
2756
2757 // Stack overflow or null pointer exception in native code.
2758 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2759 exceptionInfo->ContextRecord);
2760 return EXCEPTION_CONTINUE_SEARCH;
2761 } // /EXCEPTION_ACCESS_VIOLATION
2762 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2763 #if defined _M_IA64
2764 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2765 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2766 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2767
2768 // Compiled method patched to be non entrant? Following conditions must apply:
2769 // 1. must be first instruction in bundle
2770 // 2. must be a break instruction with appropriate code
2771 if((((uint64_t) pc & 0x0F) == 0) &&
2772 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2773 return Handle_Exception(exceptionInfo,
2774 (address)SharedRuntime::get_handle_wrong_method_stub());
2775 }
2776 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2777 #endif
2778
2779
2780 if (in_java) {
2781 switch (exception_code) {
2782 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2783 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2784
2785 case EXCEPTION_INT_OVERFLOW:
2786 return Handle_IDiv_Exception(exceptionInfo);
2787
2788 } // switch
2789 }
2790 #ifndef _WIN64
2791 if (((thread->thread_state() == _thread_in_Java) ||
2792 (thread->thread_state() == _thread_in_native)) &&
2793 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2794 {
2795 LONG result=Handle_FLT_Exception(exceptionInfo);
2796 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2797 }
2798 #endif //_WIN64
2799 }
2800
2801 if (exception_code != EXCEPTION_BREAKPOINT) {
2802 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2803 exceptionInfo->ContextRecord);
2804 }
2805 return EXCEPTION_CONTINUE_SEARCH;
2806 }
2807
2808 #ifndef _WIN64
2809 // Special care for fast JNI accessors.
2810 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2811 // the heap gets shrunk before the field access.
2812 // Need to install our own structured exception handler since native code may
2813 // install its own.
2814 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2815 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2816 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2817 address pc = (address) exceptionInfo->ContextRecord->Eip;
2818 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2819 if (addr != (address)-1) {
2820 return Handle_Exception(exceptionInfo, addr);
2821 }
2822 }
2823 return EXCEPTION_CONTINUE_SEARCH;
2824 }
2825
2826 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2827 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2828 __try { \
2829 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2830 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2831 } \
2832 return 0; \
2833 }
2834
2835 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2836 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2837 DEFINE_FAST_GETFIELD(jchar, char, Char)
2838 DEFINE_FAST_GETFIELD(jshort, short, Short)
2839 DEFINE_FAST_GETFIELD(jint, int, Int)
2840 DEFINE_FAST_GETFIELD(jlong, long, Long)
2841 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2842 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2843
2844 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2845 switch (type) {
2846 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2847 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2848 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2849 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2850 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2851 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2852 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2853 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2854 default: ShouldNotReachHere();
2855 }
2856 return (address)-1;
2857 }
2858 #endif
2859
2860 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2861 // Install a win32 structured exception handler around the test
2862 // function call so the VM can generate an error dump if needed.
2863 __try {
2864 (*funcPtr)();
2865 } __except(topLevelExceptionFilter(
2866 (_EXCEPTION_POINTERS*)_exception_info())) {
2867 // Nothing to do.
2868 }
2869 }
2870
2871 // Virtual Memory
2872
2873 int os::vm_page_size() { return os::win32::vm_page_size(); }
2874 int os::vm_allocation_granularity() {
2875 return os::win32::vm_allocation_granularity();
2876 }
2877
2878 // Windows large page support is available on Windows 2003. In order to use
2879 // large page memory, the administrator must first assign additional privilege
2880 // to the user:
2881 // + select Control Panel -> Administrative Tools -> Local Security Policy
2882 // + select Local Policies -> User Rights Assignment
2883 // + double click "Lock pages in memory", add users and/or groups
2884 // + reboot
2885 // Note the above steps are needed for administrator as well, as administrators
2886 // by default do not have the privilege to lock pages in memory.
2887 //
2888 // Note about Windows 2003: although the API supports committing large page
2889 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2890 // scenario, I found through experiment it only uses large page if the entire
2891 // memory region is reserved and committed in a single VirtualAlloc() call.
2892 // This makes Windows large page support more or less like Solaris ISM, in
2893 // that the entire heap must be committed upfront. This probably will change
2894 // in the future, if so the code below needs to be revisited.
2895
2896 #ifndef MEM_LARGE_PAGES
2897 #define MEM_LARGE_PAGES 0x20000000
2898 #endif
2899
2900 static HANDLE _hProcess;
2901 static HANDLE _hToken;
2902
2903 // Container for NUMA node list info
2904 class NUMANodeListHolder {
2905 private:
2906 int *_numa_used_node_list; // allocated below
2907 int _numa_used_node_count;
2908
2909 void free_node_list() {
2910 if (_numa_used_node_list != NULL) {
2911 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2912 }
2913 }
2914
2915 public:
2916 NUMANodeListHolder() {
2917 _numa_used_node_count = 0;
2918 _numa_used_node_list = NULL;
2919 // do rest of initialization in build routine (after function pointers are set up)
2920 }
2921
2922 ~NUMANodeListHolder() {
2923 free_node_list();
2924 }
2925
2926 bool build() {
2927 DWORD_PTR proc_aff_mask;
2928 DWORD_PTR sys_aff_mask;
2929 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2930 ULONG highest_node_number;
2931 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2932 free_node_list();
2933 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2934 for (unsigned int i = 0; i <= highest_node_number; i++) {
2935 ULONGLONG proc_mask_numa_node;
2936 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2937 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2938 _numa_used_node_list[_numa_used_node_count++] = i;
2939 }
2940 }
2941 return (_numa_used_node_count > 1);
2942 }
2943
2944 int get_count() {return _numa_used_node_count;}
2945 int get_node_list_entry(int n) {
2946 // for indexes out of range, returns -1
2947 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2948 }
2949
2950 } numa_node_list_holder;
2951
2952
2953
2954 static size_t _large_page_size = 0;
2955
2956 static bool resolve_functions_for_large_page_init() {
2957 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2958 os::Advapi32Dll::AdvapiAvailable();
2959 }
2960
2961 static bool request_lock_memory_privilege() {
2962 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2963 os::current_process_id());
2964
2965 LUID luid;
2966 if (_hProcess != NULL &&
2967 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2968 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2969
2970 TOKEN_PRIVILEGES tp;
2971 tp.PrivilegeCount = 1;
2972 tp.Privileges[0].Luid = luid;
2973 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2974
2975 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2976 // privilege. Check GetLastError() too. See MSDN document.
2977 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2978 (GetLastError() == ERROR_SUCCESS)) {
2979 return true;
2980 }
2981 }
2982
2983 return false;
2984 }
2985
2986 static void cleanup_after_large_page_init() {
2987 if (_hProcess) CloseHandle(_hProcess);
2988 _hProcess = NULL;
2989 if (_hToken) CloseHandle(_hToken);
2990 _hToken = NULL;
2991 }
2992
2993 static bool numa_interleaving_init() {
2994 bool success = false;
2995 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2996
2997 // print a warning if UseNUMAInterleaving flag is specified on command line
2998 bool warn_on_failure = use_numa_interleaving_specified;
2999 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3000
3001 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
3002 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
3003 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
3004
3005 if (os::Kernel32Dll::NumaCallsAvailable()) {
3006 if (numa_node_list_holder.build()) {
3007 if (PrintMiscellaneous && Verbose) {
3008 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
3009 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
3010 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
3011 }
3012 tty->print("\n");
3013 }
3014 success = true;
3015 } else {
3016 WARN("Process does not cover multiple NUMA nodes.");
3017 }
3018 } else {
3019 WARN("NUMA Interleaving is not supported by the operating system.");
3020 }
3021 if (!success) {
3022 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
3023 }
3024 return success;
3025 #undef WARN
3026 }
3027
3028 // this routine is used whenever we need to reserve a contiguous VA range
3029 // but we need to make separate VirtualAlloc calls for each piece of the range
3030 // Reasons for doing this:
3031 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
3032 // * UseNUMAInterleaving requires a separate node for each piece
3033 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
3034 bool should_inject_error=false) {
3035 char * p_buf;
3036 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
3037 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
3038 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
3039
3040 // first reserve enough address space in advance since we want to be
3041 // able to break a single contiguous virtual address range into multiple
3042 // large page commits but WS2003 does not allow reserving large page space
3043 // so we just use 4K pages for reserve, this gives us a legal contiguous
3044 // address space. then we will deallocate that reservation, and re alloc
3045 // using large pages
3046 const size_t size_of_reserve = bytes + chunk_size;
3047 if (bytes > size_of_reserve) {
3048 // Overflowed.
3049 return NULL;
3050 }
3051 p_buf = (char *) VirtualAlloc(addr,
3052 size_of_reserve, // size of Reserve
3053 MEM_RESERVE,
3054 PAGE_READWRITE);
3055 // If reservation failed, return NULL
3056 if (p_buf == NULL) return NULL;
3057 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
3058 os::release_memory(p_buf, bytes + chunk_size);
3059
3060 // we still need to round up to a page boundary (in case we are using large pages)
3061 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
3062 // instead we handle this in the bytes_to_rq computation below
3063 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
3064
3065 // now go through and allocate one chunk at a time until all bytes are
3066 // allocated
3067 size_t bytes_remaining = bytes;
3068 // An overflow of align_size_up() would have been caught above
3069 // in the calculation of size_of_reserve.
3070 char * next_alloc_addr = p_buf;
3071 HANDLE hProc = GetCurrentProcess();
3072
3073 #ifdef ASSERT
3074 // Variable for the failure injection
3075 long ran_num = os::random();
3076 size_t fail_after = ran_num % bytes;
3077 #endif
3078
3079 int count=0;
3080 while (bytes_remaining) {
3081 // select bytes_to_rq to get to the next chunk_size boundary
3082
3083 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3084 // Note allocate and commit
3085 char * p_new;
3086
3087 #ifdef ASSERT
3088 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3089 #else
3090 const bool inject_error_now = false;
3091 #endif
3092
3093 if (inject_error_now) {
3094 p_new = NULL;
3095 } else {
3096 if (!UseNUMAInterleaving) {
3097 p_new = (char *) VirtualAlloc(next_alloc_addr,
3098 bytes_to_rq,
3099 flags,
3100 prot);
3101 } else {
3102 // get the next node to use from the used_node_list
3103 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3104 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3105 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3106 next_alloc_addr,
3107 bytes_to_rq,
3108 flags,
3109 prot,
3110 node);
3111 }
3112 }
3113
3114 if (p_new == NULL) {
3115 // Free any allocated pages
3116 if (next_alloc_addr > p_buf) {
3117 // Some memory was committed so release it.
3118 size_t bytes_to_release = bytes - bytes_remaining;
3119 // NMT has yet to record any individual blocks, so it
3120 // need to create a dummy 'reserve' record to match
3121 // the release.
3122 MemTracker::record_virtual_memory_reserve((address)p_buf,
3123 bytes_to_release, CALLER_PC);
3124 os::release_memory(p_buf, bytes_to_release);
3125 }
3126 #ifdef ASSERT
3127 if (should_inject_error) {
3128 if (TracePageSizes && Verbose) {
3129 tty->print_cr("Reserving pages individually failed.");
3130 }
3131 }
3132 #endif
3133 return NULL;
3134 }
3135
3136 bytes_remaining -= bytes_to_rq;
3137 next_alloc_addr += bytes_to_rq;
3138 count++;
3139 }
3140 // Although the memory is allocated individually, it is returned as one.
3141 // NMT records it as one block.
3142 if ((flags & MEM_COMMIT) != 0) {
3143 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3144 } else {
3145 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3146 }
3147
3148 // made it this far, success
3149 return p_buf;
3150 }
3151
3152
3153
3154 void os::large_page_init() {
3155 if (!UseLargePages) return;
3156
3157 // print a warning if any large page related flag is specified on command line
3158 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3159 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3160 bool success = false;
3161
3162 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3163 if (resolve_functions_for_large_page_init()) {
3164 if (request_lock_memory_privilege()) {
3165 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3166 if (s) {
3167 #if defined(IA32) || defined(AMD64)
3168 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3169 WARN("JVM cannot use large pages bigger than 4mb.");
3170 } else {
3171 #endif
3172 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3173 _large_page_size = LargePageSizeInBytes;
3174 } else {
3175 _large_page_size = s;
3176 }
3177 success = true;
3178 #if defined(IA32) || defined(AMD64)
3179 }
3180 #endif
3181 } else {
3182 WARN("Large page is not supported by the processor.");
3183 }
3184 } else {
3185 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3186 }
3187 } else {
3188 WARN("Large page is not supported by the operating system.");
3189 }
3190 #undef WARN
3191
3192 const size_t default_page_size = (size_t) vm_page_size();
3193 if (success && _large_page_size > default_page_size) {
3194 _page_sizes[0] = _large_page_size;
3195 _page_sizes[1] = default_page_size;
3196 _page_sizes[2] = 0;
3197 }
3198
3199 cleanup_after_large_page_init();
3200 UseLargePages = success;
3201 }
3202
3203 // On win32, one cannot release just a part of reserved memory, it's an
3204 // all or nothing deal. When we split a reservation, we must break the
3205 // reservation into two reservations.
3206 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3207 bool realloc) {
3208 if (size > 0) {
3209 release_memory(base, size);
3210 if (realloc) {
3211 reserve_memory(split, base);
3212 }
3213 if (size != split) {
3214 reserve_memory(size - split, base + split);
3215 }
3216 }
3217 }
3218
3219 // Multiple threads can race in this code but it's not possible to unmap small sections of
3220 // virtual space to get requested alignment, like posix-like os's.
3221 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3222 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3223 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3224 "Alignment must be a multiple of allocation granularity (page size)");
3225 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3226
3227 size_t extra_size = size + alignment;
3228 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3229
3230 char* aligned_base = NULL;
3231
3232 do {
3233 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3234 if (extra_base == NULL) {
3235 return NULL;
3236 }
3237 // Do manual alignment
3238 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3239
3240 os::release_memory(extra_base, extra_size);
3241
3242 aligned_base = os::reserve_memory(size, aligned_base);
3243
3244 } while (aligned_base == NULL);
3245
3246 return aligned_base;
3247 }
3248
3249 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3250 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3251 "reserve alignment");
3252 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3253 char* res;
3254 // note that if UseLargePages is on, all the areas that require interleaving
3255 // will go thru reserve_memory_special rather than thru here.
3256 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3257 if (!use_individual) {
3258 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3259 } else {
3260 elapsedTimer reserveTimer;
3261 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3262 // in numa interleaving, we have to allocate pages individually
3263 // (well really chunks of NUMAInterleaveGranularity size)
3264 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3265 if (res == NULL) {
3266 warning("NUMA page allocation failed");
3267 }
3268 if( Verbose && PrintMiscellaneous ) {
3269 reserveTimer.stop();
3270 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3271 reserveTimer.milliseconds(), reserveTimer.ticks());
3272 }
3273 }
3274 assert(res == NULL || addr == NULL || addr == res,
3275 "Unexpected address from reserve.");
3276
3277 return res;
3278 }
3279
3280 // Reserve memory at an arbitrary address, only if that area is
3281 // available (and not reserved for something else).
3282 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3283 // Windows os::reserve_memory() fails of the requested address range is
3284 // not avilable.
3285 return reserve_memory(bytes, requested_addr);
3286 }
3287
3288 size_t os::large_page_size() {
3289 return _large_page_size;
3290 }
3291
3292 bool os::can_commit_large_page_memory() {
3293 // Windows only uses large page memory when the entire region is reserved
3294 // and committed in a single VirtualAlloc() call. This may change in the
3295 // future, but with Windows 2003 it's not possible to commit on demand.
3296 return false;
3297 }
3298
3299 bool os::can_execute_large_page_memory() {
3300 return true;
3301 }
3302
3303 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3304 assert(UseLargePages, "only for large pages");
3305
3306 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3307 return NULL; // Fallback to small pages.
3308 }
3309
3310 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3311 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3312
3313 // with large pages, there are two cases where we need to use Individual Allocation
3314 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3315 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3316 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3317 if (TracePageSizes && Verbose) {
3318 tty->print_cr("Reserving large pages individually.");
3319 }
3320 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3321 if (p_buf == NULL) {
3322 // give an appropriate warning message
3323 if (UseNUMAInterleaving) {
3324 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3325 }
3326 if (UseLargePagesIndividualAllocation) {
3327 warning("Individually allocated large pages failed, "
3328 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3329 }
3330 return NULL;
3331 }
3332
3333 return p_buf;
3334
3335 } else {
3336 if (TracePageSizes && Verbose) {
3337 tty->print_cr("Reserving large pages in a single large chunk.");
3338 }
3339 // normal policy just allocate it all at once
3340 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3341 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3342 if (res != NULL) {
3343 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3344 }
3345
3346 return res;
3347 }
3348 }
3349
3350 bool os::release_memory_special(char* base, size_t bytes) {
3351 assert(base != NULL, "Sanity check");
3352 return release_memory(base, bytes);
3353 }
3354
3355 void os::print_statistics() {
3356 }
3357
3358 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3359 int err = os::get_last_error();
3360 char buf[256];
3361 size_t buf_len = os::lasterror(buf, sizeof(buf));
3362 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3363 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3364 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3365 }
3366
3367 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3368 if (bytes == 0) {
3369 // Don't bother the OS with noops.
3370 return true;
3371 }
3372 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3373 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3374 // Don't attempt to print anything if the OS call fails. We're
3375 // probably low on resources, so the print itself may cause crashes.
3376
3377 // unless we have NUMAInterleaving enabled, the range of a commit
3378 // is always within a reserve covered by a single VirtualAlloc
3379 // in that case we can just do a single commit for the requested size
3380 if (!UseNUMAInterleaving) {
3381 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3382 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3383 return false;
3384 }
3385 if (exec) {
3386 DWORD oldprot;
3387 // Windows doc says to use VirtualProtect to get execute permissions
3388 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3389 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3390 return false;
3391 }
3392 }
3393 return true;
3394 } else {
3395
3396 // when NUMAInterleaving is enabled, the commit might cover a range that
3397 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3398 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3399 // returns represents the number of bytes that can be committed in one step.
3400 size_t bytes_remaining = bytes;
3401 char * next_alloc_addr = addr;
3402 while (bytes_remaining > 0) {
3403 MEMORY_BASIC_INFORMATION alloc_info;
3404 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3405 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3406 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3407 PAGE_READWRITE) == NULL) {
3408 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3409 exec);)
3410 return false;
3411 }
3412 if (exec) {
3413 DWORD oldprot;
3414 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3415 PAGE_EXECUTE_READWRITE, &oldprot)) {
3416 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3417 exec);)
3418 return false;
3419 }
3420 }
3421 bytes_remaining -= bytes_to_rq;
3422 next_alloc_addr += bytes_to_rq;
3423 }
3424 }
3425 // if we made it this far, return true
3426 return true;
3427 }
3428
3429 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3430 bool exec) {
3431 // alignment_hint is ignored on this OS
3432 return pd_commit_memory(addr, size, exec);
3433 }
3434
3435 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3436 const char* mesg) {
3437 assert(mesg != NULL, "mesg must be specified");
3438 if (!pd_commit_memory(addr, size, exec)) {
3439 warn_fail_commit_memory(addr, size, exec);
3440 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3441 }
3442 }
3443
3444 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3445 size_t alignment_hint, bool exec,
3446 const char* mesg) {
3447 // alignment_hint is ignored on this OS
3448 pd_commit_memory_or_exit(addr, size, exec, mesg);
3449 }
3450
3451 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3452 if (bytes == 0) {
3453 // Don't bother the OS with noops.
3454 return true;
3455 }
3456 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3457 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3458 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3459 }
3460
3461 bool os::pd_release_memory(char* addr, size_t bytes) {
3462 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3463 }
3464
3465 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3466 return os::commit_memory(addr, size, !ExecMem);
3467 }
3468
3469 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3470 return os::uncommit_memory(addr, size);
3471 }
3472
3473 // Set protections specified
3474 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3475 bool is_committed) {
3476 unsigned int p = 0;
3477 switch (prot) {
3478 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3479 case MEM_PROT_READ: p = PAGE_READONLY; break;
3480 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3481 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3482 default:
3483 ShouldNotReachHere();
3484 }
3485
3486 DWORD old_status;
3487
3488 // Strange enough, but on Win32 one can change protection only for committed
3489 // memory, not a big deal anyway, as bytes less or equal than 64K
3490 if (!is_committed) {
3491 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3492 "cannot commit protection page");
3493 }
3494 // One cannot use os::guard_memory() here, as on Win32 guard page
3495 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3496 //
3497 // Pages in the region become guard pages. Any attempt to access a guard page
3498 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3499 // the guard page status. Guard pages thus act as a one-time access alarm.
3500 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3501 }
3502
3503 bool os::guard_memory(char* addr, size_t bytes) {
3504 DWORD old_status;
3505 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3506 }
3507
3508 bool os::unguard_memory(char* addr, size_t bytes) {
3509 DWORD old_status;
3510 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3511 }
3512
3513 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3514 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3515 void os::numa_make_global(char *addr, size_t bytes) { }
3516 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3517 bool os::numa_topology_changed() { return false; }
3518 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3519 int os::numa_get_group_id() { return 0; }
3520 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3521 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3522 // Provide an answer for UMA systems
3523 ids[0] = 0;
3524 return 1;
3525 } else {
3526 // check for size bigger than actual groups_num
3527 size = MIN2(size, numa_get_groups_num());
3528 for (int i = 0; i < (int)size; i++) {
3529 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3530 }
3531 return size;
3532 }
3533 }
3534
3535 bool os::get_page_info(char *start, page_info* info) {
3536 return false;
3537 }
3538
3539 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3540 return end;
3541 }
3542
3543 char* os::non_memory_address_word() {
3544 // Must never look like an address returned by reserve_memory,
3545 // even in its subfields (as defined by the CPU immediate fields,
3546 // if the CPU splits constants across multiple instructions).
3547 return (char*)-1;
3548 }
3549
3550 #define MAX_ERROR_COUNT 100
3551 #define SYS_THREAD_ERROR 0xffffffffUL
3552
3553 void os::pd_start_thread(Thread* thread) {
3554 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3555 // Returns previous suspend state:
3556 // 0: Thread was not suspended
3557 // 1: Thread is running now
3558 // >1: Thread is still suspended.
3559 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3560 }
3561
3562 class HighResolutionInterval : public CHeapObj<mtThread> {
3563 // The default timer resolution seems to be 10 milliseconds.
3564 // (Where is this written down?)
3565 // If someone wants to sleep for only a fraction of the default,
3566 // then we set the timer resolution down to 1 millisecond for
3567 // the duration of their interval.
3568 // We carefully set the resolution back, since otherwise we
3569 // seem to incur an overhead (3%?) that we don't need.
3570 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3571 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3572 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3573 // timeBeginPeriod() if the relative error exceeded some threshold.
3574 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3575 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3576 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3577 // resolution timers running.
3578 private:
3579 jlong resolution;
3580 public:
3581 HighResolutionInterval(jlong ms) {
3582 resolution = ms % 10L;
3583 if (resolution != 0) {
3584 MMRESULT result = timeBeginPeriod(1L);
3585 }
3586 }
3587 ~HighResolutionInterval() {
3588 if (resolution != 0) {
3589 MMRESULT result = timeEndPeriod(1L);
3590 }
3591 resolution = 0L;
3592 }
3593 };
3594
3595 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3596 jlong limit = (jlong) MAXDWORD;
3597
3598 while(ms > limit) {
3599 int res;
3600 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3601 return res;
3602 ms -= limit;
3603 }
3604
3605 assert(thread == Thread::current(), "thread consistency check");
3606 OSThread* osthread = thread->osthread();
3607 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3608 int result;
3609 if (interruptable) {
3610 assert(thread->is_Java_thread(), "must be java thread");
3611 JavaThread *jt = (JavaThread *) thread;
3612 ThreadBlockInVM tbivm(jt);
3613
3614 jt->set_suspend_equivalent();
3615 // cleared by handle_special_suspend_equivalent_condition() or
3616 // java_suspend_self() via check_and_wait_while_suspended()
3617
3618 HANDLE events[1];
3619 events[0] = osthread->interrupt_event();
3620 HighResolutionInterval *phri=NULL;
3621 if(!ForceTimeHighResolution)
3622 phri = new HighResolutionInterval( ms );
3623 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3624 result = OS_TIMEOUT;
3625 } else {
3626 ResetEvent(osthread->interrupt_event());
3627 osthread->set_interrupted(false);
3628 result = OS_INTRPT;
3629 }
3630 delete phri; //if it is NULL, harmless
3631
3632 // were we externally suspended while we were waiting?
3633 jt->check_and_wait_while_suspended();
3634 } else {
3635 assert(!thread->is_Java_thread(), "must not be java thread");
3636 Sleep((long) ms);
3637 result = OS_TIMEOUT;
3638 }
3639 return result;
3640 }
3641
3642 //
3643 // Short sleep, direct OS call.
3644 //
3645 // ms = 0, means allow others (if any) to run.
3646 //
3647 void os::naked_short_sleep(jlong ms) {
3648 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3649 Sleep(ms);
3650 }
3651
3652 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3653 void os::infinite_sleep() {
3654 while (true) { // sleep forever ...
3655 Sleep(100000); // ... 100 seconds at a time
3656 }
3657 }
3658
3659 typedef BOOL (WINAPI * STTSignature)(void) ;
3660
3661 os::YieldResult os::NakedYield() {
3662 // Use either SwitchToThread() or Sleep(0)
3663 // Consider passing back the return value from SwitchToThread().
3664 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3665 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3666 } else {
3667 Sleep(0);
3668 }
3669 return os::YIELD_UNKNOWN ;
3670 }
3671
3672 void os::yield() { os::NakedYield(); }
3673
3674 void os::yield_all(int attempts) {
3675 // Yields to all threads, including threads with lower priorities
3676 Sleep(1);
3677 }
3678
3679 // Win32 only gives you access to seven real priorities at a time,
3680 // so we compress Java's ten down to seven. It would be better
3681 // if we dynamically adjusted relative priorities.
3682
3683 int os::java_to_os_priority[CriticalPriority + 1] = {
3684 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3685 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3686 THREAD_PRIORITY_LOWEST, // 2
3687 THREAD_PRIORITY_BELOW_NORMAL, // 3
3688 THREAD_PRIORITY_BELOW_NORMAL, // 4
3689 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3690 THREAD_PRIORITY_NORMAL, // 6
3691 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3692 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3693 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3694 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3695 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3696 };
3697
3698 int prio_policy1[CriticalPriority + 1] = {
3699 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3700 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3701 THREAD_PRIORITY_LOWEST, // 2
3702 THREAD_PRIORITY_BELOW_NORMAL, // 3
3703 THREAD_PRIORITY_BELOW_NORMAL, // 4
3704 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3705 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3706 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3707 THREAD_PRIORITY_HIGHEST, // 8
3708 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3709 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3710 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3711 };
3712
3713 static int prio_init() {
3714 // If ThreadPriorityPolicy is 1, switch tables
3715 if (ThreadPriorityPolicy == 1) {
3716 int i;
3717 for (i = 0; i < CriticalPriority + 1; i++) {
3718 os::java_to_os_priority[i] = prio_policy1[i];
3719 }
3720 }
3721 if (UseCriticalJavaThreadPriority) {
3722 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3723 }
3724 return 0;
3725 }
3726
3727 OSReturn os::set_native_priority(Thread* thread, int priority) {
3728 if (!UseThreadPriorities) return OS_OK;
3729 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3730 return ret ? OS_OK : OS_ERR;
3731 }
3732
3733 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3734 if ( !UseThreadPriorities ) {
3735 *priority_ptr = java_to_os_priority[NormPriority];
3736 return OS_OK;
3737 }
3738 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3739 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3740 assert(false, "GetThreadPriority failed");
3741 return OS_ERR;
3742 }
3743 *priority_ptr = os_prio;
3744 return OS_OK;
3745 }
3746
3747
3748 // Hint to the underlying OS that a task switch would not be good.
3749 // Void return because it's a hint and can fail.
3750 void os::hint_no_preempt() {}
3751
3752 void os::interrupt(Thread* thread) {
3753 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3754 "possibility of dangling Thread pointer");
3755
3756 OSThread* osthread = thread->osthread();
3757 osthread->set_interrupted(true);
3758 // More than one thread can get here with the same value of osthread,
3759 // resulting in multiple notifications. We do, however, want the store
3760 // to interrupted() to be visible to other threads before we post
3761 // the interrupt event.
3762 OrderAccess::release();
3763 SetEvent(osthread->interrupt_event());
3764 // For JSR166: unpark after setting status
3765 if (thread->is_Java_thread())
3766 ((JavaThread*)thread)->parker()->unpark();
3767
3768 ParkEvent * ev = thread->_ParkEvent ;
3769 if (ev != NULL) ev->unpark() ;
3770
3771 }
3772
3773
3774 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3775 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3776 "possibility of dangling Thread pointer");
3777
3778 OSThread* osthread = thread->osthread();
3779 // There is no synchronization between the setting of the interrupt
3780 // and it being cleared here. It is critical - see 6535709 - that
3781 // we only clear the interrupt state, and reset the interrupt event,
3782 // if we are going to report that we were indeed interrupted - else
3783 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3784 // depending on the timing. By checking thread interrupt event to see
3785 // if the thread gets real interrupt thus prevent spurious wakeup.
3786 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3787 if (interrupted && clear_interrupted) {
3788 osthread->set_interrupted(false);
3789 ResetEvent(osthread->interrupt_event());
3790 } // Otherwise leave the interrupted state alone
3791
3792 return interrupted;
3793 }
3794
3795 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3796 ExtendedPC os::get_thread_pc(Thread* thread) {
3797 CONTEXT context;
3798 context.ContextFlags = CONTEXT_CONTROL;
3799 HANDLE handle = thread->osthread()->thread_handle();
3800 #ifdef _M_IA64
3801 assert(0, "Fix get_thread_pc");
3802 return ExtendedPC(NULL);
3803 #else
3804 if (GetThreadContext(handle, &context)) {
3805 #ifdef _M_AMD64
3806 return ExtendedPC((address) context.Rip);
3807 #else
3808 return ExtendedPC((address) context.Eip);
3809 #endif
3810 } else {
3811 return ExtendedPC(NULL);
3812 }
3813 #endif
3814 }
3815
3816 // GetCurrentThreadId() returns DWORD
3817 intx os::current_thread_id() { return GetCurrentThreadId(); }
3818
3819 static int _initial_pid = 0;
3820
3821 int os::current_process_id()
3822 {
3823 return (_initial_pid ? _initial_pid : _getpid());
3824 }
3825
3826 int os::win32::_vm_page_size = 0;
3827 int os::win32::_vm_allocation_granularity = 0;
3828 int os::win32::_processor_type = 0;
3829 // Processor level is not available on non-NT systems, use vm_version instead
3830 int os::win32::_processor_level = 0;
3831 julong os::win32::_physical_memory = 0;
3832 size_t os::win32::_default_stack_size = 0;
3833
3834 intx os::win32::_os_thread_limit = 0;
3835 volatile intx os::win32::_os_thread_count = 0;
3836
3837 bool os::win32::_is_nt = false;
3838 bool os::win32::_is_windows_2003 = false;
3839 bool os::win32::_is_windows_server = false;
3840
3841 void os::win32::initialize_system_info() {
3842 SYSTEM_INFO si;
3843 GetSystemInfo(&si);
3844 _vm_page_size = si.dwPageSize;
3845 _vm_allocation_granularity = si.dwAllocationGranularity;
3846 _processor_type = si.dwProcessorType;
3847 _processor_level = si.wProcessorLevel;
3848 set_processor_count(si.dwNumberOfProcessors);
3849
3850 MEMORYSTATUSEX ms;
3851 ms.dwLength = sizeof(ms);
3852
3853 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3854 // dwMemoryLoad (% of memory in use)
3855 GlobalMemoryStatusEx(&ms);
3856 _physical_memory = ms.ullTotalPhys;
3857
3858 OSVERSIONINFOEX oi;
3859 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3860 GetVersionEx((OSVERSIONINFO*)&oi);
3861 switch(oi.dwPlatformId) {
3862 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3863 case VER_PLATFORM_WIN32_NT:
3864 _is_nt = true;
3865 {
3866 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3867 if (os_vers == 5002) {
3868 _is_windows_2003 = true;
3869 }
3870 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3871 oi.wProductType == VER_NT_SERVER) {
3872 _is_windows_server = true;
3873 }
3874 }
3875 break;
3876 default: fatal("Unknown platform");
3877 }
3878
3879 _default_stack_size = os::current_stack_size();
3880 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3881 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3882 "stack size not a multiple of page size");
3883
3884 initialize_performance_counter();
3885
3886 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3887 // known to deadlock the system, if the VM issues to thread operations with
3888 // a too high frequency, e.g., such as changing the priorities.
3889 // The 6000 seems to work well - no deadlocks has been notices on the test
3890 // programs that we have seen experience this problem.
3891 if (!os::win32::is_nt()) {
3892 StarvationMonitorInterval = 6000;
3893 }
3894 }
3895
3896
3897 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3898 char path[MAX_PATH];
3899 DWORD size;
3900 DWORD pathLen = (DWORD)sizeof(path);
3901 HINSTANCE result = NULL;
3902
3903 // only allow library name without path component
3904 assert(strchr(name, '\\') == NULL, "path not allowed");
3905 assert(strchr(name, ':') == NULL, "path not allowed");
3906 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3907 jio_snprintf(ebuf, ebuflen,
3908 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3909 return NULL;
3910 }
3911
3912 // search system directory
3913 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3914 strcat(path, "\\");
3915 strcat(path, name);
3916 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3917 return result;
3918 }
3919 }
3920
3921 // try Windows directory
3922 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3923 strcat(path, "\\");
3924 strcat(path, name);
3925 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3926 return result;
3927 }
3928 }
3929
3930 jio_snprintf(ebuf, ebuflen,
3931 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3932 return NULL;
3933 }
3934
3935 void os::win32::setmode_streams() {
3936 _setmode(_fileno(stdin), _O_BINARY);
3937 _setmode(_fileno(stdout), _O_BINARY);
3938 _setmode(_fileno(stderr), _O_BINARY);
3939 }
3940
3941
3942 bool os::is_debugger_attached() {
3943 return IsDebuggerPresent() ? true : false;
3944 }
3945
3946
3947 void os::wait_for_keypress_at_exit(void) {
3948 if (PauseAtExit) {
3949 fprintf(stderr, "Press any key to continue...\n");
3950 fgetc(stdin);
3951 }
3952 }
3953
3954
3955 int os::message_box(const char* title, const char* message) {
3956 int result = MessageBox(NULL, message, title,
3957 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3958 return result == IDYES;
3959 }
3960
3961 int os::allocate_thread_local_storage() {
3962 return TlsAlloc();
3963 }
3964
3965
3966 void os::free_thread_local_storage(int index) {
3967 TlsFree(index);
3968 }
3969
3970
3971 void os::thread_local_storage_at_put(int index, void* value) {
3972 TlsSetValue(index, value);
3973 assert(thread_local_storage_at(index) == value, "Just checking");
3974 }
3975
3976
3977 void* os::thread_local_storage_at(int index) {
3978 return TlsGetValue(index);
3979 }
3980
3981
3982 #ifndef PRODUCT
3983 #ifndef _WIN64
3984 // Helpers to check whether NX protection is enabled
3985 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3986 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3987 pex->ExceptionRecord->NumberParameters > 0 &&
3988 pex->ExceptionRecord->ExceptionInformation[0] ==
3989 EXCEPTION_INFO_EXEC_VIOLATION) {
3990 return EXCEPTION_EXECUTE_HANDLER;
3991 }
3992 return EXCEPTION_CONTINUE_SEARCH;
3993 }
3994
3995 void nx_check_protection() {
3996 // If NX is enabled we'll get an exception calling into code on the stack
3997 char code[] = { (char)0xC3 }; // ret
3998 void *code_ptr = (void *)code;
3999 __try {
4000 __asm call code_ptr
4001 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4002 tty->print_raw_cr("NX protection detected.");
4003 }
4004 }
4005 #endif // _WIN64
4006 #endif // PRODUCT
4007
4008 // this is called _before_ the global arguments have been parsed
4009 void os::init(void) {
4010 _initial_pid = _getpid();
4011
4012 init_random(1234567);
4013
4014 win32::initialize_system_info();
4015 win32::setmode_streams();
4016 init_page_sizes((size_t) win32::vm_page_size());
4017
4018 // For better scalability on MP systems (must be called after initialize_system_info)
4019 #ifndef PRODUCT
4020 if (is_MP()) {
4021 NoYieldsInMicrolock = true;
4022 }
4023 #endif
4024 // This may be overridden later when argument processing is done.
4025 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
4026 os::win32::is_windows_2003());
4027
4028 // Initialize main_process and main_thread
4029 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4030 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4031 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4032 fatal("DuplicateHandle failed\n");
4033 }
4034 main_thread_id = (int) GetCurrentThreadId();
4035 }
4036
4037 // To install functions for atexit processing
4038 extern "C" {
4039 static void perfMemory_exit_helper() {
4040 perfMemory_exit();
4041 }
4042 }
4043
4044 static jint initSock();
4045
4046 // this is called _after_ the global arguments have been parsed
4047 jint os::init_2(void) {
4048 // Allocate a single page and mark it as readable for safepoint polling
4049 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4050 guarantee( polling_page != NULL, "Reserve Failed for polling page");
4051
4052 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4053 guarantee( return_page != NULL, "Commit Failed for polling page");
4054
4055 os::set_polling_page( polling_page );
4056
4057 #ifndef PRODUCT
4058 if( Verbose && PrintMiscellaneous )
4059 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4060 #endif
4061
4062 if (!UseMembar) {
4063 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4064 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4065
4066 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4067 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
4068
4069 os::set_memory_serialize_page( mem_serialize_page );
4070
4071 #ifndef PRODUCT
4072 if(Verbose && PrintMiscellaneous)
4073 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4074 #endif
4075 }
4076
4077 // Setup Windows Exceptions
4078
4079 // for debugging float code generation bugs
4080 if (ForceFloatExceptions) {
4081 #ifndef _WIN64
4082 static long fp_control_word = 0;
4083 __asm { fstcw fp_control_word }
4084 // see Intel PPro Manual, Vol. 2, p 7-16
4085 const long precision = 0x20;
4086 const long underflow = 0x10;
4087 const long overflow = 0x08;
4088 const long zero_div = 0x04;
4089 const long denorm = 0x02;
4090 const long invalid = 0x01;
4091 fp_control_word |= invalid;
4092 __asm { fldcw fp_control_word }
4093 #endif
4094 }
4095
4096 // If stack_commit_size is 0, windows will reserve the default size,
4097 // but only commit a small portion of it.
4098 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4099 size_t default_reserve_size = os::win32::default_stack_size();
4100 size_t actual_reserve_size = stack_commit_size;
4101 if (stack_commit_size < default_reserve_size) {
4102 // If stack_commit_size == 0, we want this too
4103 actual_reserve_size = default_reserve_size;
4104 }
4105
4106 // Check minimum allowable stack size for thread creation and to initialize
4107 // the java system classes, including StackOverflowError - depends on page
4108 // size. Add a page for compiler2 recursion in main thread.
4109 // Add in 2*BytesPerWord times page size to account for VM stack during
4110 // class initialization depending on 32 or 64 bit VM.
4111 size_t min_stack_allowed =
4112 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4113 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4114 if (actual_reserve_size < min_stack_allowed) {
4115 tty->print_cr("\nThe stack size specified is too small, "
4116 "Specify at least %dk",
4117 min_stack_allowed / K);
4118 return JNI_ERR;
4119 }
4120
4121 JavaThread::set_stack_size_at_create(stack_commit_size);
4122
4123 // Calculate theoretical max. size of Threads to guard gainst artifical
4124 // out-of-memory situations, where all available address-space has been
4125 // reserved by thread stacks.
4126 assert(actual_reserve_size != 0, "Must have a stack");
4127
4128 // Calculate the thread limit when we should start doing Virtual Memory
4129 // banging. Currently when the threads will have used all but 200Mb of space.
4130 //
4131 // TODO: consider performing a similar calculation for commit size instead
4132 // as reserve size, since on a 64-bit platform we'll run into that more
4133 // often than running out of virtual memory space. We can use the
4134 // lower value of the two calculations as the os_thread_limit.
4135 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4136 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4137
4138 // at exit methods are called in the reverse order of their registration.
4139 // there is no limit to the number of functions registered. atexit does
4140 // not set errno.
4141
4142 if (PerfAllowAtExitRegistration) {
4143 // only register atexit functions if PerfAllowAtExitRegistration is set.
4144 // atexit functions can be delayed until process exit time, which
4145 // can be problematic for embedded VM situations. Embedded VMs should
4146 // call DestroyJavaVM() to assure that VM resources are released.
4147
4148 // note: perfMemory_exit_helper atexit function may be removed in
4149 // the future if the appropriate cleanup code can be added to the
4150 // VM_Exit VMOperation's doit method.
4151 if (atexit(perfMemory_exit_helper) != 0) {
4152 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4153 }
4154 }
4155
4156 #ifndef _WIN64
4157 // Print something if NX is enabled (win32 on AMD64)
4158 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4159 #endif
4160
4161 // initialize thread priority policy
4162 prio_init();
4163
4164 if (UseNUMA && !ForceNUMA) {
4165 UseNUMA = false; // We don't fully support this yet
4166 }
4167
4168 if (UseNUMAInterleaving) {
4169 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4170 bool success = numa_interleaving_init();
4171 if (!success) UseNUMAInterleaving = false;
4172 }
4173
4174 if (initSock() != JNI_OK) {
4175 return JNI_ERR;
4176 }
4177
4178 return JNI_OK;
4179 }
4180
4181 // Mark the polling page as unreadable
4182 void os::make_polling_page_unreadable(void) {
4183 DWORD old_status;
4184 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4185 fatal("Could not disable polling page");
4186 };
4187
4188 // Mark the polling page as readable
4189 void os::make_polling_page_readable(void) {
4190 DWORD old_status;
4191 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4192 fatal("Could not enable polling page");
4193 };
4194
4195
4196 int os::stat(const char *path, struct stat *sbuf) {
4197 char pathbuf[MAX_PATH];
4198 if (strlen(path) > MAX_PATH - 1) {
4199 errno = ENAMETOOLONG;
4200 return -1;
4201 }
4202 os::native_path(strcpy(pathbuf, path));
4203 int ret = ::stat(pathbuf, sbuf);
4204 if (sbuf != NULL && UseUTCFileTimestamp) {
4205 // Fix for 6539723. st_mtime returned from stat() is dependent on
4206 // the system timezone and so can return different values for the
4207 // same file if/when daylight savings time changes. This adjustment
4208 // makes sure the same timestamp is returned regardless of the TZ.
4209 //
4210 // See:
4211 // http://msdn.microsoft.com/library/
4212 // default.asp?url=/library/en-us/sysinfo/base/
4213 // time_zone_information_str.asp
4214 // and
4215 // http://msdn.microsoft.com/library/default.asp?url=
4216 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4217 //
4218 // NOTE: there is a insidious bug here: If the timezone is changed
4219 // after the call to stat() but before 'GetTimeZoneInformation()', then
4220 // the adjustment we do here will be wrong and we'll return the wrong
4221 // value (which will likely end up creating an invalid class data
4222 // archive). Absent a better API for this, or some time zone locking
4223 // mechanism, we'll have to live with this risk.
4224 TIME_ZONE_INFORMATION tz;
4225 DWORD tzid = GetTimeZoneInformation(&tz);
4226 int daylightBias =
4227 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4228 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4229 }
4230 return ret;
4231 }
4232
4233
4234 #define FT2INT64(ft) \
4235 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4236
4237
4238 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4239 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4240 // of a thread.
4241 //
4242 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4243 // the fast estimate available on the platform.
4244
4245 // current_thread_cpu_time() is not optimized for Windows yet
4246 jlong os::current_thread_cpu_time() {
4247 // return user + sys since the cost is the same
4248 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4249 }
4250
4251 jlong os::thread_cpu_time(Thread* thread) {
4252 // consistent with what current_thread_cpu_time() returns.
4253 return os::thread_cpu_time(thread, true /* user+sys */);
4254 }
4255
4256 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4257 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4258 }
4259
4260 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4261 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4262 // If this function changes, os::is_thread_cpu_time_supported() should too
4263 if (os::win32::is_nt()) {
4264 FILETIME CreationTime;
4265 FILETIME ExitTime;
4266 FILETIME KernelTime;
4267 FILETIME UserTime;
4268
4269 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4270 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4271 return -1;
4272 else
4273 if (user_sys_cpu_time) {
4274 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4275 } else {
4276 return FT2INT64(UserTime) * 100;
4277 }
4278 } else {
4279 return (jlong) timeGetTime() * 1000000;
4280 }
4281 }
4282
4283 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4284 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4285 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4286 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4287 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4288 }
4289
4290 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4291 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4292 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4293 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4294 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4295 }
4296
4297 bool os::is_thread_cpu_time_supported() {
4298 // see os::thread_cpu_time
4299 if (os::win32::is_nt()) {
4300 FILETIME CreationTime;
4301 FILETIME ExitTime;
4302 FILETIME KernelTime;
4303 FILETIME UserTime;
4304
4305 if ( GetThreadTimes(GetCurrentThread(),
4306 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4307 return false;
4308 else
4309 return true;
4310 } else {
4311 return false;
4312 }
4313 }
4314
4315 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4316 // It does have primitives (PDH API) to get CPU usage and run queue length.
4317 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4318 // If we wanted to implement loadavg on Windows, we have a few options:
4319 //
4320 // a) Query CPU usage and run queue length and "fake" an answer by
4321 // returning the CPU usage if it's under 100%, and the run queue
4322 // length otherwise. It turns out that querying is pretty slow
4323 // on Windows, on the order of 200 microseconds on a fast machine.
4324 // Note that on the Windows the CPU usage value is the % usage
4325 // since the last time the API was called (and the first call
4326 // returns 100%), so we'd have to deal with that as well.
4327 //
4328 // b) Sample the "fake" answer using a sampling thread and store
4329 // the answer in a global variable. The call to loadavg would
4330 // just return the value of the global, avoiding the slow query.
4331 //
4332 // c) Sample a better answer using exponential decay to smooth the
4333 // value. This is basically the algorithm used by UNIX kernels.
4334 //
4335 // Note that sampling thread starvation could affect both (b) and (c).
4336 int os::loadavg(double loadavg[], int nelem) {
4337 return -1;
4338 }
4339
4340
4341 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4342 bool os::dont_yield() {
4343 return DontYieldALot;
4344 }
4345
4346 // This method is a slightly reworked copy of JDK's sysOpen
4347 // from src/windows/hpi/src/sys_api_md.c
4348
4349 int os::open(const char *path, int oflag, int mode) {
4350 char pathbuf[MAX_PATH];
4351
4352 if (strlen(path) > MAX_PATH - 1) {
4353 errno = ENAMETOOLONG;
4354 return -1;
4355 }
4356 os::native_path(strcpy(pathbuf, path));
4357 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4358 }
4359
4360 FILE* os::open(int fd, const char* mode) {
4361 return ::_fdopen(fd, mode);
4362 }
4363
4364 // Is a (classpath) directory empty?
4365 bool os::dir_is_empty(const char* path) {
4366 WIN32_FIND_DATA fd;
4367 HANDLE f = FindFirstFile(path, &fd);
4368 if (f == INVALID_HANDLE_VALUE) {
4369 return true;
4370 }
4371 FindClose(f);
4372 return false;
4373 }
4374
4375 // create binary file, rewriting existing file if required
4376 int os::create_binary_file(const char* path, bool rewrite_existing) {
4377 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4378 if (!rewrite_existing) {
4379 oflags |= _O_EXCL;
4380 }
4381 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4382 }
4383
4384 // return current position of file pointer
4385 jlong os::current_file_offset(int fd) {
4386 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4387 }
4388
4389 // move file pointer to the specified offset
4390 jlong os::seek_to_file_offset(int fd, jlong offset) {
4391 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4392 }
4393
4394
4395 jlong os::lseek(int fd, jlong offset, int whence) {
4396 return (jlong) ::_lseeki64(fd, offset, whence);
4397 }
4398
4399 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4400 OVERLAPPED ov;
4401 DWORD nread;
4402 BOOL result;
4403
4404 ZeroMemory(&ov, sizeof(ov));
4405 ov.Offset = (DWORD)offset;
4406 ov.OffsetHigh = (DWORD)(offset >> 32);
4407
4408 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4409
4410 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4411
4412 return result ? nread : 0;
4413 }
4414
4415 // This method is a slightly reworked copy of JDK's sysNativePath
4416 // from src/windows/hpi/src/path_md.c
4417
4418 /* Convert a pathname to native format. On win32, this involves forcing all
4419 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4420 sometimes rejects '/') and removing redundant separators. The input path is
4421 assumed to have been converted into the character encoding used by the local
4422 system. Because this might be a double-byte encoding, care is taken to
4423 treat double-byte lead characters correctly.
4424
4425 This procedure modifies the given path in place, as the result is never
4426 longer than the original. There is no error return; this operation always
4427 succeeds. */
4428 char * os::native_path(char *path) {
4429 char *src = path, *dst = path, *end = path;
4430 char *colon = NULL; /* If a drive specifier is found, this will
4431 point to the colon following the drive
4432 letter */
4433
4434 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4435 assert(((!::IsDBCSLeadByte('/'))
4436 && (!::IsDBCSLeadByte('\\'))
4437 && (!::IsDBCSLeadByte(':'))),
4438 "Illegal lead byte");
4439
4440 /* Check for leading separators */
4441 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4442 while (isfilesep(*src)) {
4443 src++;
4444 }
4445
4446 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4447 /* Remove leading separators if followed by drive specifier. This
4448 hack is necessary to support file URLs containing drive
4449 specifiers (e.g., "file://c:/path"). As a side effect,
4450 "/c:/path" can be used as an alternative to "c:/path". */
4451 *dst++ = *src++;
4452 colon = dst;
4453 *dst++ = ':';
4454 src++;
4455 } else {
4456 src = path;
4457 if (isfilesep(src[0]) && isfilesep(src[1])) {
4458 /* UNC pathname: Retain first separator; leave src pointed at
4459 second separator so that further separators will be collapsed
4460 into the second separator. The result will be a pathname
4461 beginning with "\\\\" followed (most likely) by a host name. */
4462 src = dst = path + 1;
4463 path[0] = '\\'; /* Force first separator to '\\' */
4464 }
4465 }
4466
4467 end = dst;
4468
4469 /* Remove redundant separators from remainder of path, forcing all
4470 separators to be '\\' rather than '/'. Also, single byte space
4471 characters are removed from the end of the path because those
4472 are not legal ending characters on this operating system.
4473 */
4474 while (*src != '\0') {
4475 if (isfilesep(*src)) {
4476 *dst++ = '\\'; src++;
4477 while (isfilesep(*src)) src++;
4478 if (*src == '\0') {
4479 /* Check for trailing separator */
4480 end = dst;
4481 if (colon == dst - 2) break; /* "z:\\" */
4482 if (dst == path + 1) break; /* "\\" */
4483 if (dst == path + 2 && isfilesep(path[0])) {
4484 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4485 beginning of a UNC pathname. Even though it is not, by
4486 itself, a valid UNC pathname, we leave it as is in order
4487 to be consistent with the path canonicalizer as well
4488 as the win32 APIs, which treat this case as an invalid
4489 UNC pathname rather than as an alias for the root
4490 directory of the current drive. */
4491 break;
4492 }
4493 end = --dst; /* Path does not denote a root directory, so
4494 remove trailing separator */
4495 break;
4496 }
4497 end = dst;
4498 } else {
4499 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4500 *dst++ = *src++;
4501 if (*src) *dst++ = *src++;
4502 end = dst;
4503 } else { /* Copy a single-byte character */
4504 char c = *src++;
4505 *dst++ = c;
4506 /* Space is not a legal ending character */
4507 if (c != ' ') end = dst;
4508 }
4509 }
4510 }
4511
4512 *end = '\0';
4513
4514 /* For "z:", add "." to work around a bug in the C runtime library */
4515 if (colon == dst - 1) {
4516 path[2] = '.';
4517 path[3] = '\0';
4518 }
4519
4520 return path;
4521 }
4522
4523 // This code is a copy of JDK's sysSetLength
4524 // from src/windows/hpi/src/sys_api_md.c
4525
4526 int os::ftruncate(int fd, jlong length) {
4527 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4528 long high = (long)(length >> 32);
4529 DWORD ret;
4530
4531 if (h == (HANDLE)(-1)) {
4532 return -1;
4533 }
4534
4535 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4536 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4537 return -1;
4538 }
4539
4540 if (::SetEndOfFile(h) == FALSE) {
4541 return -1;
4542 }
4543
4544 return 0;
4545 }
4546
4547
4548 // This code is a copy of JDK's sysSync
4549 // from src/windows/hpi/src/sys_api_md.c
4550 // except for the legacy workaround for a bug in Win 98
4551
4552 int os::fsync(int fd) {
4553 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4554
4555 if ( (!::FlushFileBuffers(handle)) &&
4556 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4557 /* from winerror.h */
4558 return -1;
4559 }
4560 return 0;
4561 }
4562
4563 static int nonSeekAvailable(int, long *);
4564 static int stdinAvailable(int, long *);
4565
4566 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4567 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4568
4569 // This code is a copy of JDK's sysAvailable
4570 // from src/windows/hpi/src/sys_api_md.c
4571
4572 int os::available(int fd, jlong *bytes) {
4573 jlong cur, end;
4574 struct _stati64 stbuf64;
4575
4576 if (::_fstati64(fd, &stbuf64) >= 0) {
4577 int mode = stbuf64.st_mode;
4578 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4579 int ret;
4580 long lpbytes;
4581 if (fd == 0) {
4582 ret = stdinAvailable(fd, &lpbytes);
4583 } else {
4584 ret = nonSeekAvailable(fd, &lpbytes);
4585 }
4586 (*bytes) = (jlong)(lpbytes);
4587 return ret;
4588 }
4589 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4590 return FALSE;
4591 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4592 return FALSE;
4593 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4594 return FALSE;
4595 }
4596 *bytes = end - cur;
4597 return TRUE;
4598 } else {
4599 return FALSE;
4600 }
4601 }
4602
4603 // This code is a copy of JDK's nonSeekAvailable
4604 // from src/windows/hpi/src/sys_api_md.c
4605
4606 static int nonSeekAvailable(int fd, long *pbytes) {
4607 /* This is used for available on non-seekable devices
4608 * (like both named and anonymous pipes, such as pipes
4609 * connected to an exec'd process).
4610 * Standard Input is a special case.
4611 *
4612 */
4613 HANDLE han;
4614
4615 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4616 return FALSE;
4617 }
4618
4619 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4620 /* PeekNamedPipe fails when at EOF. In that case we
4621 * simply make *pbytes = 0 which is consistent with the
4622 * behavior we get on Solaris when an fd is at EOF.
4623 * The only alternative is to raise an Exception,
4624 * which isn't really warranted.
4625 */
4626 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4627 return FALSE;
4628 }
4629 *pbytes = 0;
4630 }
4631 return TRUE;
4632 }
4633
4634 #define MAX_INPUT_EVENTS 2000
4635
4636 // This code is a copy of JDK's stdinAvailable
4637 // from src/windows/hpi/src/sys_api_md.c
4638
4639 static int stdinAvailable(int fd, long *pbytes) {
4640 HANDLE han;
4641 DWORD numEventsRead = 0; /* Number of events read from buffer */
4642 DWORD numEvents = 0; /* Number of events in buffer */
4643 DWORD i = 0; /* Loop index */
4644 DWORD curLength = 0; /* Position marker */
4645 DWORD actualLength = 0; /* Number of bytes readable */
4646 BOOL error = FALSE; /* Error holder */
4647 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4648
4649 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4650 return FALSE;
4651 }
4652
4653 /* Construct an array of input records in the console buffer */
4654 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4655 if (error == 0) {
4656 return nonSeekAvailable(fd, pbytes);
4657 }
4658
4659 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4660 if (numEvents > MAX_INPUT_EVENTS) {
4661 numEvents = MAX_INPUT_EVENTS;
4662 }
4663
4664 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4665 if (lpBuffer == NULL) {
4666 return FALSE;
4667 }
4668
4669 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4670 if (error == 0) {
4671 os::free(lpBuffer, mtInternal);
4672 return FALSE;
4673 }
4674
4675 /* Examine input records for the number of bytes available */
4676 for(i=0; i<numEvents; i++) {
4677 if (lpBuffer[i].EventType == KEY_EVENT) {
4678
4679 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4680 &(lpBuffer[i].Event);
4681 if (keyRecord->bKeyDown == TRUE) {
4682 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4683 curLength++;
4684 if (*keyPressed == '\r') {
4685 actualLength = curLength;
4686 }
4687 }
4688 }
4689 }
4690
4691 if(lpBuffer != NULL) {
4692 os::free(lpBuffer, mtInternal);
4693 }
4694
4695 *pbytes = (long) actualLength;
4696 return TRUE;
4697 }
4698
4699 // Map a block of memory.
4700 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4701 char *addr, size_t bytes, bool read_only,
4702 bool allow_exec) {
4703 HANDLE hFile;
4704 char* base;
4705
4706 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4707 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4708 if (hFile == NULL) {
4709 if (PrintMiscellaneous && Verbose) {
4710 DWORD err = GetLastError();
4711 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4712 }
4713 return NULL;
4714 }
4715
4716 if (allow_exec) {
4717 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4718 // unless it comes from a PE image (which the shared archive is not.)
4719 // Even VirtualProtect refuses to give execute access to mapped memory
4720 // that was not previously executable.
4721 //
4722 // Instead, stick the executable region in anonymous memory. Yuck.
4723 // Penalty is that ~4 pages will not be shareable - in the future
4724 // we might consider DLLizing the shared archive with a proper PE
4725 // header so that mapping executable + sharing is possible.
4726
4727 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4728 PAGE_READWRITE);
4729 if (base == NULL) {
4730 if (PrintMiscellaneous && Verbose) {
4731 DWORD err = GetLastError();
4732 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4733 }
4734 CloseHandle(hFile);
4735 return NULL;
4736 }
4737
4738 DWORD bytes_read;
4739 OVERLAPPED overlapped;
4740 overlapped.Offset = (DWORD)file_offset;
4741 overlapped.OffsetHigh = 0;
4742 overlapped.hEvent = NULL;
4743 // ReadFile guarantees that if the return value is true, the requested
4744 // number of bytes were read before returning.
4745 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4746 if (!res) {
4747 if (PrintMiscellaneous && Verbose) {
4748 DWORD err = GetLastError();
4749 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4750 }
4751 release_memory(base, bytes);
4752 CloseHandle(hFile);
4753 return NULL;
4754 }
4755 } else {
4756 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4757 NULL /*file_name*/);
4758 if (hMap == NULL) {
4759 if (PrintMiscellaneous && Verbose) {
4760 DWORD err = GetLastError();
4761 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4762 }
4763 CloseHandle(hFile);
4764 return NULL;
4765 }
4766
4767 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4768 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4769 (DWORD)bytes, addr);
4770 if (base == NULL) {
4771 if (PrintMiscellaneous && Verbose) {
4772 DWORD err = GetLastError();
4773 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4774 }
4775 CloseHandle(hMap);
4776 CloseHandle(hFile);
4777 return NULL;
4778 }
4779
4780 if (CloseHandle(hMap) == 0) {
4781 if (PrintMiscellaneous && Verbose) {
4782 DWORD err = GetLastError();
4783 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4784 }
4785 CloseHandle(hFile);
4786 return base;
4787 }
4788 }
4789
4790 if (allow_exec) {
4791 DWORD old_protect;
4792 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4793 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4794
4795 if (!res) {
4796 if (PrintMiscellaneous && Verbose) {
4797 DWORD err = GetLastError();
4798 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4799 }
4800 // Don't consider this a hard error, on IA32 even if the
4801 // VirtualProtect fails, we should still be able to execute
4802 CloseHandle(hFile);
4803 return base;
4804 }
4805 }
4806
4807 if (CloseHandle(hFile) == 0) {
4808 if (PrintMiscellaneous && Verbose) {
4809 DWORD err = GetLastError();
4810 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4811 }
4812 return base;
4813 }
4814
4815 return base;
4816 }
4817
4818
4819 // Remap a block of memory.
4820 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4821 char *addr, size_t bytes, bool read_only,
4822 bool allow_exec) {
4823 // This OS does not allow existing memory maps to be remapped so we
4824 // have to unmap the memory before we remap it.
4825 if (!os::unmap_memory(addr, bytes)) {
4826 return NULL;
4827 }
4828
4829 // There is a very small theoretical window between the unmap_memory()
4830 // call above and the map_memory() call below where a thread in native
4831 // code may be able to access an address that is no longer mapped.
4832
4833 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4834 read_only, allow_exec);
4835 }
4836
4837
4838 // Unmap a block of memory.
4839 // Returns true=success, otherwise false.
4840
4841 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4842 BOOL result = UnmapViewOfFile(addr);
4843 if (result == 0) {
4844 if (PrintMiscellaneous && Verbose) {
4845 DWORD err = GetLastError();
4846 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4847 }
4848 return false;
4849 }
4850 return true;
4851 }
4852
4853 void os::pause() {
4854 char filename[MAX_PATH];
4855 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4856 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4857 } else {
4858 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4859 }
4860
4861 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4862 if (fd != -1) {
4863 struct stat buf;
4864 ::close(fd);
4865 while (::stat(filename, &buf) == 0) {
4866 Sleep(100);
4867 }
4868 } else {
4869 jio_fprintf(stderr,
4870 "Could not open pause file '%s', continuing immediately.\n", filename);
4871 }
4872 }
4873
4874 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
4875 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
4876 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
4877
4878 os::ThreadCrashProtection::ThreadCrashProtection() {
4879 }
4880
4881 // See the caveats for this class in os_windows.hpp
4882 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4883 // into this method and returns false. If no OS EXCEPTION was raised, returns
4884 // true.
4885 // The callback is supposed to provide the method that should be protected.
4886 //
4887 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4888
4889 Thread::muxAcquire(&_crash_mux, "CrashProtection");
4890
4891 _protected_thread = ThreadLocalStorage::thread();
4892 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
4893
4894 bool success = true;
4895 __try {
4896 _crash_protection = this;
4897 cb.call();
4898 } __except(EXCEPTION_EXECUTE_HANDLER) {
4899 // only for protection, nothing to do
4900 success = false;
4901 }
4902 _crash_protection = NULL;
4903 _protected_thread = NULL;
4904 Thread::muxRelease(&_crash_mux);
4905 return success;
4906 }
4907
4908 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4909 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4910 }
4911
4912 /*
4913 * See the caveats for this class in os_windows.hpp
4914 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4915 * into this method and returns false. If no OS EXCEPTION was raised, returns
4916 * true.
4917 * The callback is supposed to provide the method that should be protected.
4918 */
4919 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4920 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4921 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4922 "crash_protection already set?");
4923
4924 bool success = true;
4925 __try {
4926 WatcherThread::watcher_thread()->set_crash_protection(this);
4927 cb.call();
4928 } __except(EXCEPTION_EXECUTE_HANDLER) {
4929 // only for protection, nothing to do
4930 success = false;
4931 }
4932 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4933 return success;
4934 }
4935
4936 // An Event wraps a win32 "CreateEvent" kernel handle.
4937 //
4938 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4939 //
4940 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4941 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4942 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4943 // In addition, an unpark() operation might fetch the handle field, but the
4944 // event could recycle between the fetch and the SetEvent() operation.
4945 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4946 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4947 // on an stale but recycled handle would be harmless, but in practice this might
4948 // confuse other non-Sun code, so it's not a viable approach.
4949 //
4950 // 2: Once a win32 event handle is associated with an Event, it remains associated
4951 // with the Event. The event handle is never closed. This could be construed
4952 // as handle leakage, but only up to the maximum # of threads that have been extant
4953 // at any one time. This shouldn't be an issue, as windows platforms typically
4954 // permit a process to have hundreds of thousands of open handles.
4955 //
4956 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4957 // and release unused handles.
4958 //
4959 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4960 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4961 //
4962 // 5. Use an RCU-like mechanism (Read-Copy Update).
4963 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4964 //
4965 // We use (2).
4966 //
4967 // TODO-FIXME:
4968 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4969 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4970 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4971 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4972 // into a single win32 CreateEvent() handle.
4973 //
4974 // _Event transitions in park()
4975 // -1 => -1 : illegal
4976 // 1 => 0 : pass - return immediately
4977 // 0 => -1 : block
4978 //
4979 // _Event serves as a restricted-range semaphore :
4980 // -1 : thread is blocked
4981 // 0 : neutral - thread is running or ready
4982 // 1 : signaled - thread is running or ready
4983 //
4984 // Another possible encoding of _Event would be
4985 // with explicit "PARKED" and "SIGNALED" bits.
4986
4987 int os::PlatformEvent::park (jlong Millis) {
4988 guarantee (_ParkHandle != NULL , "Invariant") ;
4989 guarantee (Millis > 0 , "Invariant") ;
4990 int v ;
4991
4992 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4993 // the initial park() operation.
4994
4995 for (;;) {
4996 v = _Event ;
4997 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4998 }
4999 guarantee ((v == 0) || (v == 1), "invariant") ;
5000 if (v != 0) return OS_OK ;
5001
5002 // Do this the hard way by blocking ...
5003 // TODO: consider a brief spin here, gated on the success of recent
5004 // spin attempts by this thread.
5005 //
5006 // We decompose long timeouts into series of shorter timed waits.
5007 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5008 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5009 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5010 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5011 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5012 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5013 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5014 // for the already waited time. This policy does not admit any new outcomes.
5015 // In the future, however, we might want to track the accumulated wait time and
5016 // adjust Millis accordingly if we encounter a spurious wakeup.
5017
5018 const int MAXTIMEOUT = 0x10000000 ;
5019 DWORD rv = WAIT_TIMEOUT ;
5020 while (_Event < 0 && Millis > 0) {
5021 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
5022 if (Millis > MAXTIMEOUT) {
5023 prd = MAXTIMEOUT ;
5024 }
5025 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
5026 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
5027 if (rv == WAIT_TIMEOUT) {
5028 Millis -= prd ;
5029 }
5030 }
5031 v = _Event ;
5032 _Event = 0 ;
5033 // see comment at end of os::PlatformEvent::park() below:
5034 OrderAccess::fence() ;
5035 // If we encounter a nearly simultanous timeout expiry and unpark()
5036 // we return OS_OK indicating we awoke via unpark().
5037 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5038 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
5039 }
5040
5041 void os::PlatformEvent::park () {
5042 guarantee (_ParkHandle != NULL, "Invariant") ;
5043 // Invariant: Only the thread associated with the Event/PlatformEvent
5044 // may call park().
5045 int v ;
5046 for (;;) {
5047 v = _Event ;
5048 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5049 }
5050 guarantee ((v == 0) || (v == 1), "invariant") ;
5051 if (v != 0) return ;
5052
5053 // Do this the hard way by blocking ...
5054 // TODO: consider a brief spin here, gated on the success of recent
5055 // spin attempts by this thread.
5056 while (_Event < 0) {
5057 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
5058 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
5059 }
5060
5061 // Usually we'll find _Event == 0 at this point, but as
5062 // an optional optimization we clear it, just in case can
5063 // multiple unpark() operations drove _Event up to 1.
5064 _Event = 0 ;
5065 OrderAccess::fence() ;
5066 guarantee (_Event >= 0, "invariant") ;
5067 }
5068
5069 void os::PlatformEvent::unpark() {
5070 guarantee (_ParkHandle != NULL, "Invariant") ;
5071
5072 // Transitions for _Event:
5073 // 0 :=> 1
5074 // 1 :=> 1
5075 // -1 :=> either 0 or 1; must signal target thread
5076 // That is, we can safely transition _Event from -1 to either
5077 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5078 // unpark() calls.
5079 // See also: "Semaphores in Plan 9" by Mullender & Cox
5080 //
5081 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5082 // that it will take two back-to-back park() calls for the owning
5083 // thread to block. This has the benefit of forcing a spurious return
5084 // from the first park() call after an unpark() call which will help
5085 // shake out uses of park() and unpark() without condition variables.
5086
5087 if (Atomic::xchg(1, &_Event) >= 0) return;
5088
5089 ::SetEvent(_ParkHandle);
5090 }
5091
5092
5093 // JSR166
5094 // -------------------------------------------------------
5095
5096 /*
5097 * The Windows implementation of Park is very straightforward: Basic
5098 * operations on Win32 Events turn out to have the right semantics to
5099 * use them directly. We opportunistically resuse the event inherited
5100 * from Monitor.
5101 */
5102
5103
5104 void Parker::park(bool isAbsolute, jlong time) {
5105 guarantee (_ParkEvent != NULL, "invariant") ;
5106 // First, demultiplex/decode time arguments
5107 if (time < 0) { // don't wait
5108 return;
5109 }
5110 else if (time == 0 && !isAbsolute) {
5111 time = INFINITE;
5112 }
5113 else if (isAbsolute) {
5114 time -= os::javaTimeMillis(); // convert to relative time
5115 if (time <= 0) // already elapsed
5116 return;
5117 }
5118 else { // relative
5119 time /= 1000000; // Must coarsen from nanos to millis
5120 if (time == 0) // Wait for the minimal time unit if zero
5121 time = 1;
5122 }
5123
5124 JavaThread* thread = (JavaThread*)(Thread::current());
5125 assert(thread->is_Java_thread(), "Must be JavaThread");
5126 JavaThread *jt = (JavaThread *)thread;
5127
5128 // Don't wait if interrupted or already triggered
5129 if (Thread::is_interrupted(thread, false) ||
5130 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5131 ResetEvent(_ParkEvent);
5132 return;
5133 }
5134 else {
5135 ThreadBlockInVM tbivm(jt);
5136 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5137 jt->set_suspend_equivalent();
5138
5139 WaitForSingleObject(_ParkEvent, time);
5140 ResetEvent(_ParkEvent);
5141
5142 // If externally suspended while waiting, re-suspend
5143 if (jt->handle_special_suspend_equivalent_condition()) {
5144 jt->java_suspend_self();
5145 }
5146 }
5147 }
5148
5149 void Parker::unpark() {
5150 guarantee (_ParkEvent != NULL, "invariant") ;
5151 SetEvent(_ParkEvent);
5152 }
5153
5154 // Run the specified command in a separate process. Return its exit value,
5155 // or -1 on failure (e.g. can't create a new process).
5156 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5157 STARTUPINFO si;
5158 PROCESS_INFORMATION pi;
5159
5160 memset(&si, 0, sizeof(si));
5161 si.cb = sizeof(si);
5162 memset(&pi, 0, sizeof(pi));
5163 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5164 cmd, // command line
5165 NULL, // process security attribute
5166 NULL, // thread security attribute
5167 TRUE, // inherits system handles
5168 0, // no creation flags
5169 NULL, // use parent's environment block
5170 NULL, // use parent's starting directory
5171 &si, // (in) startup information
5172 &pi); // (out) process information
5173
5174 if (rslt) {
5175 // Wait until child process exits.
5176 WaitForSingleObject(pi.hProcess, INFINITE);
5177
5178 DWORD exit_code;
5179 GetExitCodeProcess(pi.hProcess, &exit_code);
5180
5181 // Close process and thread handles.
5182 CloseHandle(pi.hProcess);
5183 CloseHandle(pi.hThread);
5184
5185 return (int)exit_code;
5186 } else {
5187 return -1;
5188 }
5189 }
5190
5191 //--------------------------------------------------------------------------------------------------
5192 // Non-product code
5193
5194 static int mallocDebugIntervalCounter = 0;
5195 static int mallocDebugCounter = 0;
5196 bool os::check_heap(bool force) {
5197 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5198 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5199 // Note: HeapValidate executes two hardware breakpoints when it finds something
5200 // wrong; at these points, eax contains the address of the offending block (I think).
5201 // To get to the exlicit error message(s) below, just continue twice.
5202 HANDLE heap = GetProcessHeap();
5203 { HeapLock(heap);
5204 PROCESS_HEAP_ENTRY phe;
5205 phe.lpData = NULL;
5206 while (HeapWalk(heap, &phe) != 0) {
5207 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5208 !HeapValidate(heap, 0, phe.lpData)) {
5209 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5210 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5211 fatal("corrupted C heap");
5212 }
5213 }
5214 DWORD err = GetLastError();
5215 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5216 fatal(err_msg("heap walk aborted with error %d", err));
5217 }
5218 HeapUnlock(heap);
5219 }
5220 mallocDebugIntervalCounter = 0;
5221 }
5222 return true;
5223 }
5224
5225
5226 bool os::find(address addr, outputStream* st) {
5227 // Nothing yet
5228 return false;
5229 }
5230
5231 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5232 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5233
5234 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5235 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5236 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5237 address addr = (address) exceptionRecord->ExceptionInformation[1];
5238
5239 if (os::is_memory_serialize_page(thread, addr))
5240 return EXCEPTION_CONTINUE_EXECUTION;
5241 }
5242
5243 return EXCEPTION_CONTINUE_SEARCH;
5244 }
5245
5246 // We don't build a headless jre for Windows
5247 bool os::is_headless_jre() { return false; }
5248
5249 static jint initSock() {
5250 WSADATA wsadata;
5251
5252 if (!os::WinSock2Dll::WinSock2Available()) {
5253 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5254 ::GetLastError());
5255 return JNI_ERR;
5256 }
5257
5258 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5259 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5260 ::GetLastError());
5261 return JNI_ERR;
5262 }
5263 return JNI_OK;
5264 }
5265
5266 struct hostent* os::get_host_by_name(char* name) {
5267 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5268 }
5269
5270 int os::socket_close(int fd) {
5271 return ::closesocket(fd);
5272 }
5273
5274 int os::socket_available(int fd, jint *pbytes) {
5275 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5276 return (ret < 0) ? 0 : 1;
5277 }
5278
5279 int os::socket(int domain, int type, int protocol) {
5280 return ::socket(domain, type, protocol);
5281 }
5282
5283 int os::listen(int fd, int count) {
5284 return ::listen(fd, count);
5285 }
5286
5287 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5288 return ::connect(fd, him, len);
5289 }
5290
5291 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5292 return ::accept(fd, him, len);
5293 }
5294
5295 int os::sendto(int fd, char* buf, size_t len, uint flags,
5296 struct sockaddr* to, socklen_t tolen) {
5297
5298 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5299 }
5300
5301 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5302 sockaddr* from, socklen_t* fromlen) {
5303
5304 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5305 }
5306
5307 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5308 return ::recv(fd, buf, (int)nBytes, flags);
5309 }
5310
5311 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5312 return ::send(fd, buf, (int)nBytes, flags);
5313 }
5314
5315 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5316 return ::send(fd, buf, (int)nBytes, flags);
5317 }
5318
5319 int os::timeout(int fd, long timeout) {
5320 fd_set tbl;
5321 struct timeval t;
5322
5323 t.tv_sec = timeout / 1000;
5324 t.tv_usec = (timeout % 1000) * 1000;
5325
5326 tbl.fd_count = 1;
5327 tbl.fd_array[0] = fd;
5328
5329 return ::select(1, &tbl, 0, 0, &t);
5330 }
5331
5332 int os::get_host_name(char* name, int namelen) {
5333 return ::gethostname(name, namelen);
5334 }
5335
5336 int os::socket_shutdown(int fd, int howto) {
5337 return ::shutdown(fd, howto);
5338 }
5339
5340 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5341 return ::bind(fd, him, len);
5342 }
5343
5344 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5345 return ::getsockname(fd, him, len);
5346 }
5347
5348 int os::get_sock_opt(int fd, int level, int optname,
5349 char* optval, socklen_t* optlen) {
5350 return ::getsockopt(fd, level, optname, optval, optlen);
5351 }
5352
5353 int os::set_sock_opt(int fd, int level, int optname,
5354 const char* optval, socklen_t optlen) {
5355 return ::setsockopt(fd, level, optname, optval, optlen);
5356 }
5357
5358 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5359 #if defined(IA32)
5360 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5361 #elif defined (AMD64)
5362 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5363 #endif
5364
5365 // returns true if thread could be suspended,
5366 // false otherwise
5367 static bool do_suspend(HANDLE* h) {
5368 if (h != NULL) {
5369 if (SuspendThread(*h) != ~0) {
5370 return true;
5371 }
5372 }
5373 return false;
5374 }
5375
5376 // resume the thread
5377 // calling resume on an active thread is a no-op
5378 static void do_resume(HANDLE* h) {
5379 if (h != NULL) {
5380 ResumeThread(*h);
5381 }
5382 }
5383
5384 // retrieve a suspend/resume context capable handle
5385 // from the tid. Caller validates handle return value.
5386 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5387 if (h != NULL) {
5388 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5389 }
5390 }
5391
5392 //
5393 // Thread sampling implementation
5394 //
5395 void os::SuspendedThreadTask::internal_do_task() {
5396 CONTEXT ctxt;
5397 HANDLE h = NULL;
5398
5399 // get context capable handle for thread
5400 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5401
5402 // sanity
5403 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5404 return;
5405 }
5406
5407 // suspend the thread
5408 if (do_suspend(&h)) {
5409 ctxt.ContextFlags = sampling_context_flags;
5410 // get thread context
5411 GetThreadContext(h, &ctxt);
5412 SuspendedThreadTaskContext context(_thread, &ctxt);
5413 // pass context to Thread Sampling impl
5414 do_task(context);
5415 // resume thread
5416 do_resume(&h);
5417 }
5418
5419 // close handle
5420 CloseHandle(h);
5421 }
5422
5423
5424 // Kernel32 API
5425 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5426 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5427 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5428 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5429 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5430
5431 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5432 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5433 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5434 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5435 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5436
5437
5438 BOOL os::Kernel32Dll::initialized = FALSE;
5439 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5440 assert(initialized && _GetLargePageMinimum != NULL,
5441 "GetLargePageMinimumAvailable() not yet called");
5442 return _GetLargePageMinimum();
5443 }
5444
5445 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5446 if (!initialized) {
5447 initialize();
5448 }
5449 return _GetLargePageMinimum != NULL;
5450 }
5451
5452 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5453 if (!initialized) {
5454 initialize();
5455 }
5456 return _VirtualAllocExNuma != NULL;
5457 }
5458
5459 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5460 assert(initialized && _VirtualAllocExNuma != NULL,
5461 "NUMACallsAvailable() not yet called");
5462
5463 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5464 }
5465
5466 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5467 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5468 "NUMACallsAvailable() not yet called");
5469
5470 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5471 }
5472
5473 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5474 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5475 "NUMACallsAvailable() not yet called");
5476
5477 return _GetNumaNodeProcessorMask(node, proc_mask);
5478 }
5479
5480 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5481 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5482 if (!initialized) {
5483 initialize();
5484 }
5485
5486 if (_RtlCaptureStackBackTrace != NULL) {
5487 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5488 BackTrace, BackTraceHash);
5489 } else {
5490 return 0;
5491 }
5492 }
5493
5494 void os::Kernel32Dll::initializeCommon() {
5495 if (!initialized) {
5496 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5497 assert(handle != NULL, "Just check");
5498 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5499 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5500 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5501 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5502 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5503 initialized = TRUE;
5504 }
5505 }
5506
5507
5508
5509 #ifndef JDK6_OR_EARLIER
5510
5511 void os::Kernel32Dll::initialize() {
5512 initializeCommon();
5513 }
5514
5515
5516 // Kernel32 API
5517 inline BOOL os::Kernel32Dll::SwitchToThread() {
5518 return ::SwitchToThread();
5519 }
5520
5521 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5522 return true;
5523 }
5524
5525 // Help tools
5526 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5527 return true;
5528 }
5529
5530 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5531 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5532 }
5533
5534 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5535 return ::Module32First(hSnapshot, lpme);
5536 }
5537
5538 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5539 return ::Module32Next(hSnapshot, lpme);
5540 }
5541
5542 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5543 ::GetNativeSystemInfo(lpSystemInfo);
5544 }
5545
5546 // PSAPI API
5547 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5548 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5549 }
5550
5551 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5552 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5553 }
5554
5555 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5556 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5557 }
5558
5559 inline BOOL os::PSApiDll::PSApiAvailable() {
5560 return true;
5561 }
5562
5563
5564 // WinSock2 API
5565 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5566 return ::WSAStartup(wVersionRequested, lpWSAData);
5567 }
5568
5569 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5570 return ::gethostbyname(name);
5571 }
5572
5573 inline BOOL os::WinSock2Dll::WinSock2Available() {
5574 return true;
5575 }
5576
5577 // Advapi API
5578 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5579 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5580 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5581 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5582 BufferLength, PreviousState, ReturnLength);
5583 }
5584
5585 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5586 PHANDLE TokenHandle) {
5587 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5588 }
5589
5590 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5591 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5592 }
5593
5594 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5595 return true;
5596 }
5597
5598 void* os::get_default_process_handle() {
5599 return (void*)GetModuleHandle(NULL);
5600 }
5601
5602 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5603 // which is used to find statically linked in agents.
5604 // Additionally for windows, takes into account __stdcall names.
5605 // Parameters:
5606 // sym_name: Symbol in library we are looking for
5607 // lib_name: Name of library to look in, NULL for shared libs.
5608 // is_absolute_path == true if lib_name is absolute path to agent
5609 // such as "C:/a/b/L.dll"
5610 // == false if only the base name of the library is passed in
5611 // such as "L"
5612 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5613 bool is_absolute_path) {
5614 char *agent_entry_name;
5615 size_t len;
5616 size_t name_len;
5617 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5618 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5619 const char *start;
5620
5621 if (lib_name != NULL) {
5622 len = name_len = strlen(lib_name);
5623 if (is_absolute_path) {
5624 // Need to strip path, prefix and suffix
5625 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5626 lib_name = ++start;
5627 } else {
5628 // Need to check for drive prefix
5629 if ((start = strchr(lib_name, ':')) != NULL) {
5630 lib_name = ++start;
5631 }
5632 }
5633 if (len <= (prefix_len + suffix_len)) {
5634 return NULL;
5635 }
5636 lib_name += prefix_len;
5637 name_len = strlen(lib_name) - suffix_len;
5638 }
5639 }
5640 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5641 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5642 if (agent_entry_name == NULL) {
5643 return NULL;
5644 }
5645 if (lib_name != NULL) {
5646 const char *p = strrchr(sym_name, '@');
5647 if (p != NULL && p != sym_name) {
5648 // sym_name == _Agent_OnLoad@XX
5649 strncpy(agent_entry_name, sym_name, (p - sym_name));
5650 agent_entry_name[(p-sym_name)] = '\0';
5651 // agent_entry_name == _Agent_OnLoad
5652 strcat(agent_entry_name, "_");
5653 strncat(agent_entry_name, lib_name, name_len);
5654 strcat(agent_entry_name, p);
5655 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5656 } else {
5657 strcpy(agent_entry_name, sym_name);
5658 strcat(agent_entry_name, "_");
5659 strncat(agent_entry_name, lib_name, name_len);
5660 }
5661 } else {
5662 strcpy(agent_entry_name, sym_name);
5663 }
5664 return agent_entry_name;
5665 }
5666
5667 #else
5668 // Kernel32 API
5669 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5670 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5671 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5672 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5673 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5674
5675 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5676 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5677 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5678 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5679 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5680
5681 void os::Kernel32Dll::initialize() {
5682 if (!initialized) {
5683 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5684 assert(handle != NULL, "Just check");
5685
5686 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5687 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5688 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5689 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5690 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5691 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5692 initializeCommon(); // resolve the functions that always need resolving
5693
5694 initialized = TRUE;
5695 }
5696 }
5697
5698 BOOL os::Kernel32Dll::SwitchToThread() {
5699 assert(initialized && _SwitchToThread != NULL,
5700 "SwitchToThreadAvailable() not yet called");
5701 return _SwitchToThread();
5702 }
5703
5704
5705 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5706 if (!initialized) {
5707 initialize();
5708 }
5709 return _SwitchToThread != NULL;
5710 }
5711
5712 // Help tools
5713 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5714 if (!initialized) {
5715 initialize();
5716 }
5717 return _CreateToolhelp32Snapshot != NULL &&
5718 _Module32First != NULL &&
5719 _Module32Next != NULL;
5720 }
5721
5722 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5723 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5724 "HelpToolsAvailable() not yet called");
5725
5726 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5727 }
5728
5729 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5730 assert(initialized && _Module32First != NULL,
5731 "HelpToolsAvailable() not yet called");
5732
5733 return _Module32First(hSnapshot, lpme);
5734 }
5735
5736 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5737 assert(initialized && _Module32Next != NULL,
5738 "HelpToolsAvailable() not yet called");
5739
5740 return _Module32Next(hSnapshot, lpme);
5741 }
5742
5743
5744 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5745 if (!initialized) {
5746 initialize();
5747 }
5748 return _GetNativeSystemInfo != NULL;
5749 }
5750
5751 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5752 assert(initialized && _GetNativeSystemInfo != NULL,
5753 "GetNativeSystemInfoAvailable() not yet called");
5754
5755 _GetNativeSystemInfo(lpSystemInfo);
5756 }
5757
5758 // PSAPI API
5759
5760
5761 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5762 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5763 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5764
5765 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5766 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5767 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5768 BOOL os::PSApiDll::initialized = FALSE;
5769
5770 void os::PSApiDll::initialize() {
5771 if (!initialized) {
5772 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5773 if (handle != NULL) {
5774 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5775 "EnumProcessModules");
5776 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5777 "GetModuleFileNameExA");
5778 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5779 "GetModuleInformation");
5780 }
5781 initialized = TRUE;
5782 }
5783 }
5784
5785
5786
5787 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5788 assert(initialized && _EnumProcessModules != NULL,
5789 "PSApiAvailable() not yet called");
5790 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5791 }
5792
5793 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5794 assert(initialized && _GetModuleFileNameEx != NULL,
5795 "PSApiAvailable() not yet called");
5796 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5797 }
5798
5799 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5800 assert(initialized && _GetModuleInformation != NULL,
5801 "PSApiAvailable() not yet called");
5802 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5803 }
5804
5805 BOOL os::PSApiDll::PSApiAvailable() {
5806 if (!initialized) {
5807 initialize();
5808 }
5809 return _EnumProcessModules != NULL &&
5810 _GetModuleFileNameEx != NULL &&
5811 _GetModuleInformation != NULL;
5812 }
5813
5814
5815 // WinSock2 API
5816 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5817 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5818
5819 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5820 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5821 BOOL os::WinSock2Dll::initialized = FALSE;
5822
5823 void os::WinSock2Dll::initialize() {
5824 if (!initialized) {
5825 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5826 if (handle != NULL) {
5827 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5828 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5829 }
5830 initialized = TRUE;
5831 }
5832 }
5833
5834
5835 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5836 assert(initialized && _WSAStartup != NULL,
5837 "WinSock2Available() not yet called");
5838 return _WSAStartup(wVersionRequested, lpWSAData);
5839 }
5840
5841 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5842 assert(initialized && _gethostbyname != NULL,
5843 "WinSock2Available() not yet called");
5844 return _gethostbyname(name);
5845 }
5846
5847 BOOL os::WinSock2Dll::WinSock2Available() {
5848 if (!initialized) {
5849 initialize();
5850 }
5851 return _WSAStartup != NULL &&
5852 _gethostbyname != NULL;
5853 }
5854
5855 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5856 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5857 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5858
5859 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5860 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5861 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5862 BOOL os::Advapi32Dll::initialized = FALSE;
5863
5864 void os::Advapi32Dll::initialize() {
5865 if (!initialized) {
5866 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5867 if (handle != NULL) {
5868 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5869 "AdjustTokenPrivileges");
5870 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5871 "OpenProcessToken");
5872 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5873 "LookupPrivilegeValueA");
5874 }
5875 initialized = TRUE;
5876 }
5877 }
5878
5879 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5880 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5881 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5882 assert(initialized && _AdjustTokenPrivileges != NULL,
5883 "AdvapiAvailable() not yet called");
5884 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5885 BufferLength, PreviousState, ReturnLength);
5886 }
5887
5888 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5889 PHANDLE TokenHandle) {
5890 assert(initialized && _OpenProcessToken != NULL,
5891 "AdvapiAvailable() not yet called");
5892 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5893 }
5894
5895 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5896 assert(initialized && _LookupPrivilegeValue != NULL,
5897 "AdvapiAvailable() not yet called");
5898 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5899 }
5900
5901 BOOL os::Advapi32Dll::AdvapiAvailable() {
5902 if (!initialized) {
5903 initialize();
5904 }
5905 return _AdjustTokenPrivileges != NULL &&
5906 _OpenProcessToken != NULL &&
5907 _LookupPrivilegeValue != NULL;
5908 }
5909
5910 #endif
5911
5912 #ifndef PRODUCT
5913
5914 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5915 // contiguous memory block at a particular address.
5916 // The test first tries to find a good approximate address to allocate at by using the same
5917 // method to allocate some memory at any address. The test then tries to allocate memory in
5918 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5919 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5920 // the previously allocated memory is available for allocation. The only actual failure
5921 // that is reported is when the test tries to allocate at a particular location but gets a
5922 // different valid one. A NULL return value at this point is not considered an error but may
5923 // be legitimate.
5924 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5925 void TestReserveMemorySpecial_test() {
5926 if (!UseLargePages) {
5927 if (VerboseInternalVMTests) {
5928 gclog_or_tty->print("Skipping test because large pages are disabled");
5929 }
5930 return;
5931 }
5932 // save current value of globals
5933 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5934 bool old_use_numa_interleaving = UseNUMAInterleaving;
5935
5936 // set globals to make sure we hit the correct code path
5937 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5938
5939 // do an allocation at an address selected by the OS to get a good one.
5940 const size_t large_allocation_size = os::large_page_size() * 4;
5941 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5942 if (result == NULL) {
5943 if (VerboseInternalVMTests) {
5944 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5945 large_allocation_size);
5946 }
5947 } else {
5948 os::release_memory_special(result, large_allocation_size);
5949
5950 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5951 // we managed to get it once.
5952 const size_t expected_allocation_size = os::large_page_size();
5953 char* expected_location = result + os::large_page_size();
5954 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5955 if (actual_location == NULL) {
5956 if (VerboseInternalVMTests) {
5957 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5958 expected_location, large_allocation_size);
5959 }
5960 } else {
5961 // release memory
5962 os::release_memory_special(actual_location, expected_allocation_size);
5963 // only now check, after releasing any memory to avoid any leaks.
5964 assert(actual_location == expected_location,
5965 err_msg("Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5966 expected_location, expected_allocation_size, actual_location));
5967 }
5968 }
5969
5970 // restore globals
5971 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5972 UseNUMAInterleaving = old_use_numa_interleaving;
5973 }
5974 #endif // PRODUCT
5975