Wed, 01 Feb 2012 07:59:01 -0800
7141200: log some interesting information in ring buffers for crashes
Reviewed-by: kvn, jrose, kevinw, brutisso, twisti, jmasa
1 /*
2 * Copyright (c) 1997, 2012, 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 */
25 // Must be at least Windows 2000 or XP to use VectoredExceptions and IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
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 "interpreter/interpreter.hpp"
36 #include "jvm_windows.h"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "mutex_windows.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "os_share_windows.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/runtimeService.hpp"
62 #include "thread_windows.inline.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
68 #ifdef TARGET_ARCH_x86
69 # include "assembler_x86.inline.hpp"
70 # include "nativeInst_x86.hpp"
71 #endif
72 #ifdef COMPILER1
73 #include "c1/c1_Runtime1.hpp"
74 #endif
75 #ifdef COMPILER2
76 #include "opto/runtime.hpp"
77 #endif
79 #ifdef _DEBUG
80 #include <crtdbg.h>
81 #endif
84 #include <windows.h>
85 #include <sys/types.h>
86 #include <sys/stat.h>
87 #include <sys/timeb.h>
88 #include <objidl.h>
89 #include <shlobj.h>
91 #include <malloc.h>
92 #include <signal.h>
93 #include <direct.h>
94 #include <errno.h>
95 #include <fcntl.h>
96 #include <io.h>
97 #include <process.h> // For _beginthreadex(), _endthreadex()
98 #include <imagehlp.h> // For os::dll_address_to_function_name
100 /* for enumerating dll libraries */
101 #include <vdmdbg.h>
103 // for timer info max values which include all bits
104 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
106 // For DLL loading/load error detection
107 // Values of PE COFF
108 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
109 #define IMAGE_FILE_SIGNATURE_LENGTH 4
111 static HANDLE main_process;
112 static HANDLE main_thread;
113 static int main_thread_id;
115 static FILETIME process_creation_time;
116 static FILETIME process_exit_time;
117 static FILETIME process_user_time;
118 static FILETIME process_kernel_time;
120 #ifdef _WIN64
121 PVOID topLevelVectoredExceptionHandler = NULL;
122 #endif
124 #ifdef _M_IA64
125 #define __CPU__ ia64
126 #elif _M_AMD64
127 #define __CPU__ amd64
128 #else
129 #define __CPU__ i486
130 #endif
132 // save DLL module handle, used by GetModuleFileName
134 HINSTANCE vm_lib_handle;
136 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
137 switch (reason) {
138 case DLL_PROCESS_ATTACH:
139 vm_lib_handle = hinst;
140 if(ForceTimeHighResolution)
141 timeBeginPeriod(1L);
142 break;
143 case DLL_PROCESS_DETACH:
144 if(ForceTimeHighResolution)
145 timeEndPeriod(1L);
146 #ifdef _WIN64
147 if (topLevelVectoredExceptionHandler != NULL) {
148 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
149 topLevelVectoredExceptionHandler = NULL;
150 }
151 #endif
152 break;
153 default:
154 break;
155 }
156 return true;
157 }
159 static inline double fileTimeAsDouble(FILETIME* time) {
160 const double high = (double) ((unsigned int) ~0);
161 const double split = 10000000.0;
162 double result = (time->dwLowDateTime / split) +
163 time->dwHighDateTime * (high/split);
164 return result;
165 }
167 // Implementation of os
169 bool os::getenv(const char* name, char* buffer, int len) {
170 int result = GetEnvironmentVariable(name, buffer, len);
171 return result > 0 && result < len;
172 }
175 // No setuid programs under Windows.
176 bool os::have_special_privileges() {
177 return false;
178 }
181 // This method is a periodic task to check for misbehaving JNI applications
182 // under CheckJNI, we can add any periodic checks here.
183 // For Windows at the moment does nothing
184 void os::run_periodic_checks() {
185 return;
186 }
188 #ifndef _WIN64
189 // previous UnhandledExceptionFilter, if there is one
190 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
192 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
193 #endif
194 void os::init_system_properties_values() {
195 /* sysclasspath, java_home, dll_dir */
196 {
197 char *home_path;
198 char *dll_path;
199 char *pslash;
200 char *bin = "\\bin";
201 char home_dir[MAX_PATH];
203 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
204 os::jvm_path(home_dir, sizeof(home_dir));
205 // Found the full path to jvm[_g].dll.
206 // Now cut the path to <java_home>/jre if we can.
207 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
208 pslash = strrchr(home_dir, '\\');
209 if (pslash != NULL) {
210 *pslash = '\0'; /* get rid of \{client|server} */
211 pslash = strrchr(home_dir, '\\');
212 if (pslash != NULL)
213 *pslash = '\0'; /* get rid of \bin */
214 }
215 }
217 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
218 if (home_path == NULL)
219 return;
220 strcpy(home_path, home_dir);
221 Arguments::set_java_home(home_path);
223 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
224 if (dll_path == NULL)
225 return;
226 strcpy(dll_path, home_dir);
227 strcat(dll_path, bin);
228 Arguments::set_dll_dir(dll_path);
230 if (!set_boot_path('\\', ';'))
231 return;
232 }
234 /* library_path */
235 #define EXT_DIR "\\lib\\ext"
236 #define BIN_DIR "\\bin"
237 #define PACKAGE_DIR "\\Sun\\Java"
238 {
239 /* Win32 library search order (See the documentation for LoadLibrary):
240 *
241 * 1. The directory from which application is loaded.
242 * 2. The system wide Java Extensions directory (Java only)
243 * 3. System directory (GetSystemDirectory)
244 * 4. Windows directory (GetWindowsDirectory)
245 * 5. The PATH environment variable
246 * 6. The current directory
247 */
249 char *library_path;
250 char tmp[MAX_PATH];
251 char *path_str = ::getenv("PATH");
253 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
254 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
256 library_path[0] = '\0';
258 GetModuleFileName(NULL, tmp, sizeof(tmp));
259 *(strrchr(tmp, '\\')) = '\0';
260 strcat(library_path, tmp);
262 GetWindowsDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265 strcat(library_path, PACKAGE_DIR BIN_DIR);
267 GetSystemDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
271 GetWindowsDirectory(tmp, sizeof(tmp));
272 strcat(library_path, ";");
273 strcat(library_path, tmp);
275 if (path_str) {
276 strcat(library_path, ";");
277 strcat(library_path, path_str);
278 }
280 strcat(library_path, ";.");
282 Arguments::set_library_path(library_path);
283 FREE_C_HEAP_ARRAY(char, library_path);
284 }
286 /* Default extensions directory */
287 {
288 char path[MAX_PATH];
289 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
290 GetWindowsDirectory(path, MAX_PATH);
291 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
292 path, PACKAGE_DIR, EXT_DIR);
293 Arguments::set_ext_dirs(buf);
294 }
295 #undef EXT_DIR
296 #undef BIN_DIR
297 #undef PACKAGE_DIR
299 /* Default endorsed standards directory. */
300 {
301 #define ENDORSED_DIR "\\lib\\endorsed"
302 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
303 char * buf = NEW_C_HEAP_ARRAY(char, len);
304 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
305 Arguments::set_endorsed_dirs(buf);
306 #undef ENDORSED_DIR
307 }
309 #ifndef _WIN64
310 // set our UnhandledExceptionFilter and save any previous one
311 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
312 #endif
314 // Done
315 return;
316 }
318 void os::breakpoint() {
319 DebugBreak();
320 }
322 // Invoked from the BREAKPOINT Macro
323 extern "C" void breakpoint() {
324 os::breakpoint();
325 }
327 // Returns an estimate of the current stack pointer. Result must be guaranteed
328 // to point into the calling threads stack, and be no lower than the current
329 // stack pointer.
331 address os::current_stack_pointer() {
332 int dummy;
333 address sp = (address)&dummy;
334 return sp;
335 }
337 // os::current_stack_base()
338 //
339 // Returns the base of the stack, which is the stack's
340 // starting address. This function must be called
341 // while running on the stack of the thread being queried.
343 address os::current_stack_base() {
344 MEMORY_BASIC_INFORMATION minfo;
345 address stack_bottom;
346 size_t stack_size;
348 VirtualQuery(&minfo, &minfo, sizeof(minfo));
349 stack_bottom = (address)minfo.AllocationBase;
350 stack_size = minfo.RegionSize;
352 // Add up the sizes of all the regions with the same
353 // AllocationBase.
354 while( 1 )
355 {
356 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
357 if ( stack_bottom == (address)minfo.AllocationBase )
358 stack_size += minfo.RegionSize;
359 else
360 break;
361 }
363 #ifdef _M_IA64
364 // IA64 has memory and register stacks
365 stack_size = stack_size / 2;
366 #endif
367 return stack_bottom + stack_size;
368 }
370 size_t os::current_stack_size() {
371 size_t sz;
372 MEMORY_BASIC_INFORMATION minfo;
373 VirtualQuery(&minfo, &minfo, sizeof(minfo));
374 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
375 return sz;
376 }
378 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
379 const struct tm* time_struct_ptr = localtime(clock);
380 if (time_struct_ptr != NULL) {
381 *res = *time_struct_ptr;
382 return res;
383 }
384 return NULL;
385 }
387 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
389 // Thread start routine for all new Java threads
390 static unsigned __stdcall java_start(Thread* thread) {
391 // Try to randomize the cache line index of hot stack frames.
392 // This helps when threads of the same stack traces evict each other's
393 // cache lines. The threads can be either from the same JVM instance, or
394 // from different JVM instances. The benefit is especially true for
395 // processors with hyperthreading technology.
396 static int counter = 0;
397 int pid = os::current_process_id();
398 _alloca(((pid ^ counter++) & 7) * 128);
400 OSThread* osthr = thread->osthread();
401 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
403 if (UseNUMA) {
404 int lgrp_id = os::numa_get_group_id();
405 if (lgrp_id != -1) {
406 thread->set_lgrp_id(lgrp_id);
407 }
408 }
411 if (UseVectoredExceptions) {
412 // If we are using vectored exception we don't need to set a SEH
413 thread->run();
414 }
415 else {
416 // Install a win32 structured exception handler around every thread created
417 // by VM, so VM can genrate error dump when an exception occurred in non-
418 // Java thread (e.g. VM thread).
419 __try {
420 thread->run();
421 } __except(topLevelExceptionFilter(
422 (_EXCEPTION_POINTERS*)_exception_info())) {
423 // Nothing to do.
424 }
425 }
427 // One less thread is executing
428 // When the VMThread gets here, the main thread may have already exited
429 // which frees the CodeHeap containing the Atomic::add code
430 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
431 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
432 }
434 return 0;
435 }
437 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
438 // Allocate the OSThread object
439 OSThread* osthread = new OSThread(NULL, NULL);
440 if (osthread == NULL) return NULL;
442 // Initialize support for Java interrupts
443 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
444 if (interrupt_event == NULL) {
445 delete osthread;
446 return NULL;
447 }
448 osthread->set_interrupt_event(interrupt_event);
450 // Store info on the Win32 thread into the OSThread
451 osthread->set_thread_handle(thread_handle);
452 osthread->set_thread_id(thread_id);
454 if (UseNUMA) {
455 int lgrp_id = os::numa_get_group_id();
456 if (lgrp_id != -1) {
457 thread->set_lgrp_id(lgrp_id);
458 }
459 }
461 // Initial thread state is INITIALIZED, not SUSPENDED
462 osthread->set_state(INITIALIZED);
464 return osthread;
465 }
468 bool os::create_attached_thread(JavaThread* thread) {
469 #ifdef ASSERT
470 thread->verify_not_published();
471 #endif
472 HANDLE thread_h;
473 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
474 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
475 fatal("DuplicateHandle failed\n");
476 }
477 OSThread* osthread = create_os_thread(thread, thread_h,
478 (int)current_thread_id());
479 if (osthread == NULL) {
480 return false;
481 }
483 // Initial thread state is RUNNABLE
484 osthread->set_state(RUNNABLE);
486 thread->set_osthread(osthread);
487 return true;
488 }
490 bool os::create_main_thread(JavaThread* thread) {
491 #ifdef ASSERT
492 thread->verify_not_published();
493 #endif
494 if (_starting_thread == NULL) {
495 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
496 if (_starting_thread == NULL) {
497 return false;
498 }
499 }
501 // The primordial thread is runnable from the start)
502 _starting_thread->set_state(RUNNABLE);
504 thread->set_osthread(_starting_thread);
505 return true;
506 }
508 // Allocate and initialize a new OSThread
509 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
510 unsigned thread_id;
512 // Allocate the OSThread object
513 OSThread* osthread = new OSThread(NULL, NULL);
514 if (osthread == NULL) {
515 return false;
516 }
518 // Initialize support for Java interrupts
519 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
520 if (interrupt_event == NULL) {
521 delete osthread;
522 return NULL;
523 }
524 osthread->set_interrupt_event(interrupt_event);
525 osthread->set_interrupted(false);
527 thread->set_osthread(osthread);
529 if (stack_size == 0) {
530 switch (thr_type) {
531 case os::java_thread:
532 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
533 if (JavaThread::stack_size_at_create() > 0)
534 stack_size = JavaThread::stack_size_at_create();
535 break;
536 case os::compiler_thread:
537 if (CompilerThreadStackSize > 0) {
538 stack_size = (size_t)(CompilerThreadStackSize * K);
539 break;
540 } // else fall through:
541 // use VMThreadStackSize if CompilerThreadStackSize is not defined
542 case os::vm_thread:
543 case os::pgc_thread:
544 case os::cgc_thread:
545 case os::watcher_thread:
546 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
547 break;
548 }
549 }
551 // Create the Win32 thread
552 //
553 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
554 // does not specify stack size. Instead, it specifies the size of
555 // initially committed space. The stack size is determined by
556 // PE header in the executable. If the committed "stack_size" is larger
557 // than default value in the PE header, the stack is rounded up to the
558 // nearest multiple of 1MB. For example if the launcher has default
559 // stack size of 320k, specifying any size less than 320k does not
560 // affect the actual stack size at all, it only affects the initial
561 // commitment. On the other hand, specifying 'stack_size' larger than
562 // default value may cause significant increase in memory usage, because
563 // not only the stack space will be rounded up to MB, but also the
564 // entire space is committed upfront.
565 //
566 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
567 // for CreateThread() that can treat 'stack_size' as stack size. However we
568 // are not supposed to call CreateThread() directly according to MSDN
569 // document because JVM uses C runtime library. The good news is that the
570 // flag appears to work with _beginthredex() as well.
572 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
573 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
574 #endif
576 HANDLE thread_handle =
577 (HANDLE)_beginthreadex(NULL,
578 (unsigned)stack_size,
579 (unsigned (__stdcall *)(void*)) java_start,
580 thread,
581 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
582 &thread_id);
583 if (thread_handle == NULL) {
584 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
585 // without the flag.
586 thread_handle =
587 (HANDLE)_beginthreadex(NULL,
588 (unsigned)stack_size,
589 (unsigned (__stdcall *)(void*)) java_start,
590 thread,
591 CREATE_SUSPENDED,
592 &thread_id);
593 }
594 if (thread_handle == NULL) {
595 // Need to clean up stuff we've allocated so far
596 CloseHandle(osthread->interrupt_event());
597 thread->set_osthread(NULL);
598 delete osthread;
599 return NULL;
600 }
602 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
604 // Store info on the Win32 thread into the OSThread
605 osthread->set_thread_handle(thread_handle);
606 osthread->set_thread_id(thread_id);
608 // Initial thread state is INITIALIZED, not SUSPENDED
609 osthread->set_state(INITIALIZED);
611 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
612 return true;
613 }
616 // Free Win32 resources related to the OSThread
617 void os::free_thread(OSThread* osthread) {
618 assert(osthread != NULL, "osthread not set");
619 CloseHandle(osthread->thread_handle());
620 CloseHandle(osthread->interrupt_event());
621 delete osthread;
622 }
625 static int has_performance_count = 0;
626 static jlong first_filetime;
627 static jlong initial_performance_count;
628 static jlong performance_frequency;
631 jlong as_long(LARGE_INTEGER x) {
632 jlong result = 0; // initialization to avoid warning
633 set_high(&result, x.HighPart);
634 set_low(&result, x.LowPart);
635 return result;
636 }
639 jlong os::elapsed_counter() {
640 LARGE_INTEGER count;
641 if (has_performance_count) {
642 QueryPerformanceCounter(&count);
643 return as_long(count) - initial_performance_count;
644 } else {
645 FILETIME wt;
646 GetSystemTimeAsFileTime(&wt);
647 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
648 }
649 }
652 jlong os::elapsed_frequency() {
653 if (has_performance_count) {
654 return performance_frequency;
655 } else {
656 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
657 return 10000000;
658 }
659 }
662 julong os::available_memory() {
663 return win32::available_memory();
664 }
666 julong os::win32::available_memory() {
667 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
668 // value if total memory is larger than 4GB
669 MEMORYSTATUSEX ms;
670 ms.dwLength = sizeof(ms);
671 GlobalMemoryStatusEx(&ms);
673 return (julong)ms.ullAvailPhys;
674 }
676 julong os::physical_memory() {
677 return win32::physical_memory();
678 }
680 julong os::allocatable_physical_memory(julong size) {
681 #ifdef _LP64
682 return size;
683 #else
684 // Limit to 1400m because of the 2gb address space wall
685 return MIN2(size, (julong)1400*M);
686 #endif
687 }
689 // VC6 lacks DWORD_PTR
690 #if _MSC_VER < 1300
691 typedef UINT_PTR DWORD_PTR;
692 #endif
694 int os::active_processor_count() {
695 DWORD_PTR lpProcessAffinityMask = 0;
696 DWORD_PTR lpSystemAffinityMask = 0;
697 int proc_count = processor_count();
698 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
699 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
700 // Nof active processors is number of bits in process affinity mask
701 int bitcount = 0;
702 while (lpProcessAffinityMask != 0) {
703 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
704 bitcount++;
705 }
706 return bitcount;
707 } else {
708 return proc_count;
709 }
710 }
712 void os::set_native_thread_name(const char *name) {
713 // Not yet implemented.
714 return;
715 }
717 bool os::distribute_processes(uint length, uint* distribution) {
718 // Not yet implemented.
719 return false;
720 }
722 bool os::bind_to_processor(uint processor_id) {
723 // Not yet implemented.
724 return false;
725 }
727 static void initialize_performance_counter() {
728 LARGE_INTEGER count;
729 if (QueryPerformanceFrequency(&count)) {
730 has_performance_count = 1;
731 performance_frequency = as_long(count);
732 QueryPerformanceCounter(&count);
733 initial_performance_count = as_long(count);
734 } else {
735 has_performance_count = 0;
736 FILETIME wt;
737 GetSystemTimeAsFileTime(&wt);
738 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
739 }
740 }
743 double os::elapsedTime() {
744 return (double) elapsed_counter() / (double) elapsed_frequency();
745 }
748 // Windows format:
749 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
750 // Java format:
751 // Java standards require the number of milliseconds since 1/1/1970
753 // Constant offset - calculated using offset()
754 static jlong _offset = 116444736000000000;
755 // Fake time counter for reproducible results when debugging
756 static jlong fake_time = 0;
758 #ifdef ASSERT
759 // Just to be safe, recalculate the offset in debug mode
760 static jlong _calculated_offset = 0;
761 static int _has_calculated_offset = 0;
763 jlong offset() {
764 if (_has_calculated_offset) return _calculated_offset;
765 SYSTEMTIME java_origin;
766 java_origin.wYear = 1970;
767 java_origin.wMonth = 1;
768 java_origin.wDayOfWeek = 0; // ignored
769 java_origin.wDay = 1;
770 java_origin.wHour = 0;
771 java_origin.wMinute = 0;
772 java_origin.wSecond = 0;
773 java_origin.wMilliseconds = 0;
774 FILETIME jot;
775 if (!SystemTimeToFileTime(&java_origin, &jot)) {
776 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
777 }
778 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
779 _has_calculated_offset = 1;
780 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
781 return _calculated_offset;
782 }
783 #else
784 jlong offset() {
785 return _offset;
786 }
787 #endif
789 jlong windows_to_java_time(FILETIME wt) {
790 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
791 return (a - offset()) / 10000;
792 }
794 FILETIME java_to_windows_time(jlong l) {
795 jlong a = (l * 10000) + offset();
796 FILETIME result;
797 result.dwHighDateTime = high(a);
798 result.dwLowDateTime = low(a);
799 return result;
800 }
802 // For now, we say that Windows does not support vtime. I have no idea
803 // whether it can actually be made to (DLD, 9/13/05).
805 bool os::supports_vtime() { return false; }
806 bool os::enable_vtime() { return false; }
807 bool os::vtime_enabled() { return false; }
808 double os::elapsedVTime() {
809 // better than nothing, but not much
810 return elapsedTime();
811 }
813 jlong os::javaTimeMillis() {
814 if (UseFakeTimers) {
815 return fake_time++;
816 } else {
817 FILETIME wt;
818 GetSystemTimeAsFileTime(&wt);
819 return windows_to_java_time(wt);
820 }
821 }
823 jlong os::javaTimeNanos() {
824 if (!has_performance_count) {
825 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
826 } else {
827 LARGE_INTEGER current_count;
828 QueryPerformanceCounter(¤t_count);
829 double current = as_long(current_count);
830 double freq = performance_frequency;
831 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
832 return time;
833 }
834 }
836 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
837 if (!has_performance_count) {
838 // javaTimeMillis() doesn't have much percision,
839 // but it is not going to wrap -- so all 64 bits
840 info_ptr->max_value = ALL_64_BITS;
842 // this is a wall clock timer, so may skip
843 info_ptr->may_skip_backward = true;
844 info_ptr->may_skip_forward = true;
845 } else {
846 jlong freq = performance_frequency;
847 if (freq < NANOSECS_PER_SEC) {
848 // the performance counter is 64 bits and we will
849 // be multiplying it -- so no wrap in 64 bits
850 info_ptr->max_value = ALL_64_BITS;
851 } else if (freq > NANOSECS_PER_SEC) {
852 // use the max value the counter can reach to
853 // determine the max value which could be returned
854 julong max_counter = (julong)ALL_64_BITS;
855 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
856 } else {
857 // the performance counter is 64 bits and we will
858 // be using it directly -- so no wrap in 64 bits
859 info_ptr->max_value = ALL_64_BITS;
860 }
862 // using a counter, so no skipping
863 info_ptr->may_skip_backward = false;
864 info_ptr->may_skip_forward = false;
865 }
866 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
867 }
869 char* os::local_time_string(char *buf, size_t buflen) {
870 SYSTEMTIME st;
871 GetLocalTime(&st);
872 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
873 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
874 return buf;
875 }
877 bool os::getTimesSecs(double* process_real_time,
878 double* process_user_time,
879 double* process_system_time) {
880 HANDLE h_process = GetCurrentProcess();
881 FILETIME create_time, exit_time, kernel_time, user_time;
882 BOOL result = GetProcessTimes(h_process,
883 &create_time,
884 &exit_time,
885 &kernel_time,
886 &user_time);
887 if (result != 0) {
888 FILETIME wt;
889 GetSystemTimeAsFileTime(&wt);
890 jlong rtc_millis = windows_to_java_time(wt);
891 jlong user_millis = windows_to_java_time(user_time);
892 jlong system_millis = windows_to_java_time(kernel_time);
893 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
894 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
895 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
896 return true;
897 } else {
898 return false;
899 }
900 }
902 void os::shutdown() {
904 // allow PerfMemory to attempt cleanup of any persistent resources
905 perfMemory_exit();
907 // flush buffered output, finish log files
908 ostream_abort();
910 // Check for abort hook
911 abort_hook_t abort_hook = Arguments::abort_hook();
912 if (abort_hook != NULL) {
913 abort_hook();
914 }
915 }
918 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
919 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
921 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
922 HINSTANCE dbghelp;
923 EXCEPTION_POINTERS ep;
924 MINIDUMP_EXCEPTION_INFORMATION mei;
925 MINIDUMP_EXCEPTION_INFORMATION* pmei;
927 HANDLE hProcess = GetCurrentProcess();
928 DWORD processId = GetCurrentProcessId();
929 HANDLE dumpFile;
930 MINIDUMP_TYPE dumpType;
931 static const char* cwd;
933 // If running on a client version of Windows and user has not explicitly enabled dumping
934 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
935 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
936 return;
937 // If running on a server version of Windows and user has explictly disabled dumping
938 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
939 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
940 return;
941 }
943 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
945 if (dbghelp == NULL) {
946 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
947 return;
948 }
950 _MiniDumpWriteDump = CAST_TO_FN_PTR(
951 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
952 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
953 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
955 if (_MiniDumpWriteDump == NULL) {
956 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
957 return;
958 }
960 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
962 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
963 // API_VERSION_NUMBER 11 or higher contains the ones we want though
964 #if API_VERSION_NUMBER >= 11
965 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
966 MiniDumpWithUnloadedModules);
967 #endif
969 cwd = get_current_directory(NULL, 0);
970 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
971 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
973 if (dumpFile == INVALID_HANDLE_VALUE) {
974 VMError::report_coredump_status("Failed to create file for dumping", false);
975 return;
976 }
977 if (exceptionRecord != NULL && contextRecord != NULL) {
978 ep.ContextRecord = (PCONTEXT) contextRecord;
979 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
981 mei.ThreadId = GetCurrentThreadId();
982 mei.ExceptionPointers = &ep;
983 pmei = &mei;
984 } else {
985 pmei = NULL;
986 }
989 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
990 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
991 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
992 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
993 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
994 } else {
995 VMError::report_coredump_status(buffer, true);
996 }
998 CloseHandle(dumpFile);
999 }
1003 void os::abort(bool dump_core)
1004 {
1005 os::shutdown();
1006 // no core dump on Windows
1007 ::exit(1);
1008 }
1010 // Die immediately, no exit hook, no abort hook, no cleanup.
1011 void os::die() {
1012 _exit(-1);
1013 }
1015 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1016 // * dirent_md.c 1.15 00/02/02
1017 //
1018 // The declarations for DIR and struct dirent are in jvm_win32.h.
1020 /* Caller must have already run dirname through JVM_NativePath, which removes
1021 duplicate slashes and converts all instances of '/' into '\\'. */
1023 DIR *
1024 os::opendir(const char *dirname)
1025 {
1026 assert(dirname != NULL, "just checking"); // hotspot change
1027 DIR *dirp = (DIR *)malloc(sizeof(DIR));
1028 DWORD fattr; // hotspot change
1029 char alt_dirname[4] = { 0, 0, 0, 0 };
1031 if (dirp == 0) {
1032 errno = ENOMEM;
1033 return 0;
1034 }
1036 /*
1037 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1038 * as a directory in FindFirstFile(). We detect this case here and
1039 * prepend the current drive name.
1040 */
1041 if (dirname[1] == '\0' && dirname[0] == '\\') {
1042 alt_dirname[0] = _getdrive() + 'A' - 1;
1043 alt_dirname[1] = ':';
1044 alt_dirname[2] = '\\';
1045 alt_dirname[3] = '\0';
1046 dirname = alt_dirname;
1047 }
1049 dirp->path = (char *)malloc(strlen(dirname) + 5);
1050 if (dirp->path == 0) {
1051 free(dirp);
1052 errno = ENOMEM;
1053 return 0;
1054 }
1055 strcpy(dirp->path, dirname);
1057 fattr = GetFileAttributes(dirp->path);
1058 if (fattr == 0xffffffff) {
1059 free(dirp->path);
1060 free(dirp);
1061 errno = ENOENT;
1062 return 0;
1063 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1064 free(dirp->path);
1065 free(dirp);
1066 errno = ENOTDIR;
1067 return 0;
1068 }
1070 /* Append "*.*", or possibly "\\*.*", to path */
1071 if (dirp->path[1] == ':'
1072 && (dirp->path[2] == '\0'
1073 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1074 /* No '\\' needed for cases like "Z:" or "Z:\" */
1075 strcat(dirp->path, "*.*");
1076 } else {
1077 strcat(dirp->path, "\\*.*");
1078 }
1080 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1081 if (dirp->handle == INVALID_HANDLE_VALUE) {
1082 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1083 free(dirp->path);
1084 free(dirp);
1085 errno = EACCES;
1086 return 0;
1087 }
1088 }
1089 return dirp;
1090 }
1092 /* parameter dbuf unused on Windows */
1094 struct dirent *
1095 os::readdir(DIR *dirp, dirent *dbuf)
1096 {
1097 assert(dirp != NULL, "just checking"); // hotspot change
1098 if (dirp->handle == INVALID_HANDLE_VALUE) {
1099 return 0;
1100 }
1102 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1104 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1105 if (GetLastError() == ERROR_INVALID_HANDLE) {
1106 errno = EBADF;
1107 return 0;
1108 }
1109 FindClose(dirp->handle);
1110 dirp->handle = INVALID_HANDLE_VALUE;
1111 }
1113 return &dirp->dirent;
1114 }
1116 int
1117 os::closedir(DIR *dirp)
1118 {
1119 assert(dirp != NULL, "just checking"); // hotspot change
1120 if (dirp->handle != INVALID_HANDLE_VALUE) {
1121 if (!FindClose(dirp->handle)) {
1122 errno = EBADF;
1123 return -1;
1124 }
1125 dirp->handle = INVALID_HANDLE_VALUE;
1126 }
1127 free(dirp->path);
1128 free(dirp);
1129 return 0;
1130 }
1132 // This must be hard coded because it's the system's temporary
1133 // directory not the java application's temp directory, ala java.io.tmpdir.
1134 const char* os::get_temp_directory() {
1135 static char path_buf[MAX_PATH];
1136 if (GetTempPath(MAX_PATH, path_buf)>0)
1137 return path_buf;
1138 else{
1139 path_buf[0]='\0';
1140 return path_buf;
1141 }
1142 }
1144 static bool file_exists(const char* filename) {
1145 if (filename == NULL || strlen(filename) == 0) {
1146 return false;
1147 }
1148 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1149 }
1151 void os::dll_build_name(char *buffer, size_t buflen,
1152 const char* pname, const char* fname) {
1153 const size_t pnamelen = pname ? strlen(pname) : 0;
1154 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1156 // Quietly truncates on buffer overflow. Should be an error.
1157 if (pnamelen + strlen(fname) + 10 > buflen) {
1158 *buffer = '\0';
1159 return;
1160 }
1162 if (pnamelen == 0) {
1163 jio_snprintf(buffer, buflen, "%s.dll", fname);
1164 } else if (c == ':' || c == '\\') {
1165 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1166 } else if (strchr(pname, *os::path_separator()) != NULL) {
1167 int n;
1168 char** pelements = split_path(pname, &n);
1169 for (int i = 0 ; i < n ; i++) {
1170 char* path = pelements[i];
1171 // Really shouldn't be NULL, but check can't hurt
1172 size_t plen = (path == NULL) ? 0 : strlen(path);
1173 if (plen == 0) {
1174 continue; // skip the empty path values
1175 }
1176 const char lastchar = path[plen - 1];
1177 if (lastchar == ':' || lastchar == '\\') {
1178 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1179 } else {
1180 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1181 }
1182 if (file_exists(buffer)) {
1183 break;
1184 }
1185 }
1186 // release the storage
1187 for (int i = 0 ; i < n ; i++) {
1188 if (pelements[i] != NULL) {
1189 FREE_C_HEAP_ARRAY(char, pelements[i]);
1190 }
1191 }
1192 if (pelements != NULL) {
1193 FREE_C_HEAP_ARRAY(char*, pelements);
1194 }
1195 } else {
1196 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1197 }
1198 }
1200 // Needs to be in os specific directory because windows requires another
1201 // header file <direct.h>
1202 const char* os::get_current_directory(char *buf, int buflen) {
1203 return _getcwd(buf, buflen);
1204 }
1206 //-----------------------------------------------------------
1207 // Helper functions for fatal error handler
1208 #ifdef _WIN64
1209 // Helper routine which returns true if address in
1210 // within the NTDLL address space.
1211 //
1212 static bool _addr_in_ntdll( address addr )
1213 {
1214 HMODULE hmod;
1215 MODULEINFO minfo;
1217 hmod = GetModuleHandle("NTDLL.DLL");
1218 if ( hmod == NULL ) return false;
1219 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1220 &minfo, sizeof(MODULEINFO)) )
1221 return false;
1223 if ( (addr >= minfo.lpBaseOfDll) &&
1224 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1225 return true;
1226 else
1227 return false;
1228 }
1229 #endif
1232 // Enumerate all modules for a given process ID
1233 //
1234 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1235 // different API for doing this. We use PSAPI.DLL on NT based
1236 // Windows and ToolHelp on 95/98/Me.
1238 // Callback function that is called by enumerate_modules() on
1239 // every DLL module.
1240 // Input parameters:
1241 // int pid,
1242 // char* module_file_name,
1243 // address module_base_addr,
1244 // unsigned module_size,
1245 // void* param
1246 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1248 // enumerate_modules for Windows NT, using PSAPI
1249 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1250 {
1251 HANDLE hProcess ;
1253 # define MAX_NUM_MODULES 128
1254 HMODULE modules[MAX_NUM_MODULES];
1255 static char filename[ MAX_PATH ];
1256 int result = 0;
1258 if (!os::PSApiDll::PSApiAvailable()) {
1259 return 0;
1260 }
1262 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1263 FALSE, pid ) ;
1264 if (hProcess == NULL) return 0;
1266 DWORD size_needed;
1267 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1268 sizeof(modules), &size_needed)) {
1269 CloseHandle( hProcess );
1270 return 0;
1271 }
1273 // number of modules that are currently loaded
1274 int num_modules = size_needed / sizeof(HMODULE);
1276 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1277 // Get Full pathname:
1278 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1279 filename, sizeof(filename))) {
1280 filename[0] = '\0';
1281 }
1283 MODULEINFO modinfo;
1284 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1285 &modinfo, sizeof(modinfo))) {
1286 modinfo.lpBaseOfDll = NULL;
1287 modinfo.SizeOfImage = 0;
1288 }
1290 // Invoke callback function
1291 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1292 modinfo.SizeOfImage, param);
1293 if (result) break;
1294 }
1296 CloseHandle( hProcess ) ;
1297 return result;
1298 }
1301 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1302 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1303 {
1304 HANDLE hSnapShot ;
1305 static MODULEENTRY32 modentry ;
1306 int result = 0;
1308 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1309 return 0;
1310 }
1312 // Get a handle to a Toolhelp snapshot of the system
1313 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1314 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1315 return FALSE ;
1316 }
1318 // iterate through all modules
1319 modentry.dwSize = sizeof(MODULEENTRY32) ;
1320 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1322 while( not_done ) {
1323 // invoke the callback
1324 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1325 modentry.modBaseSize, param);
1326 if (result) break;
1328 modentry.dwSize = sizeof(MODULEENTRY32) ;
1329 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1330 }
1332 CloseHandle(hSnapShot);
1333 return result;
1334 }
1336 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1337 {
1338 // Get current process ID if caller doesn't provide it.
1339 if (!pid) pid = os::current_process_id();
1341 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1342 else return _enumerate_modules_windows(pid, func, param);
1343 }
1345 struct _modinfo {
1346 address addr;
1347 char* full_path; // point to a char buffer
1348 int buflen; // size of the buffer
1349 address base_addr;
1350 };
1352 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1353 unsigned size, void * param) {
1354 struct _modinfo *pmod = (struct _modinfo *)param;
1355 if (!pmod) return -1;
1357 if (base_addr <= pmod->addr &&
1358 base_addr+size > pmod->addr) {
1359 // if a buffer is provided, copy path name to the buffer
1360 if (pmod->full_path) {
1361 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1362 }
1363 pmod->base_addr = base_addr;
1364 return 1;
1365 }
1366 return 0;
1367 }
1369 bool os::dll_address_to_library_name(address addr, char* buf,
1370 int buflen, int* offset) {
1371 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1372 // return the full path to the DLL file, sometimes it returns path
1373 // to the corresponding PDB file (debug info); sometimes it only
1374 // returns partial path, which makes life painful.
1376 struct _modinfo mi;
1377 mi.addr = addr;
1378 mi.full_path = buf;
1379 mi.buflen = buflen;
1380 int pid = os::current_process_id();
1381 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1382 // buf already contains path name
1383 if (offset) *offset = addr - mi.base_addr;
1384 return true;
1385 } else {
1386 if (buf) buf[0] = '\0';
1387 if (offset) *offset = -1;
1388 return false;
1389 }
1390 }
1392 bool os::dll_address_to_function_name(address addr, char *buf,
1393 int buflen, int *offset) {
1394 if (Decoder::decode(addr, buf, buflen, offset)) {
1395 return true;
1396 }
1397 if (offset != NULL) *offset = -1;
1398 if (buf != NULL) buf[0] = '\0';
1399 return false;
1400 }
1402 // save the start and end address of jvm.dll into param[0] and param[1]
1403 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1404 unsigned size, void * param) {
1405 if (!param) return -1;
1407 if (base_addr <= (address)_locate_jvm_dll &&
1408 base_addr+size > (address)_locate_jvm_dll) {
1409 ((address*)param)[0] = base_addr;
1410 ((address*)param)[1] = base_addr + size;
1411 return 1;
1412 }
1413 return 0;
1414 }
1416 address vm_lib_location[2]; // start and end address of jvm.dll
1418 // check if addr is inside jvm.dll
1419 bool os::address_is_in_vm(address addr) {
1420 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1421 int pid = os::current_process_id();
1422 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1423 assert(false, "Can't find jvm module.");
1424 return false;
1425 }
1426 }
1428 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1429 }
1431 // print module info; param is outputStream*
1432 static int _print_module(int pid, char* fname, address base,
1433 unsigned size, void* param) {
1434 if (!param) return -1;
1436 outputStream* st = (outputStream*)param;
1438 address end_addr = base + size;
1439 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1440 return 0;
1441 }
1443 // Loads .dll/.so and
1444 // in case of error it checks if .dll/.so was built for the
1445 // same architecture as Hotspot is running on
1446 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1447 {
1448 void * result = LoadLibrary(name);
1449 if (result != NULL)
1450 {
1451 return result;
1452 }
1454 DWORD errcode = GetLastError();
1455 if (errcode == ERROR_MOD_NOT_FOUND) {
1456 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1457 ebuf[ebuflen-1]='\0';
1458 return NULL;
1459 }
1461 // Parsing dll below
1462 // If we can read dll-info and find that dll was built
1463 // for an architecture other than Hotspot is running in
1464 // - then print to buffer "DLL was built for a different architecture"
1465 // else call os::lasterror to obtain system error message
1467 // Read system error message into ebuf
1468 // It may or may not be overwritten below (in the for loop and just above)
1469 lasterror(ebuf, (size_t) ebuflen);
1470 ebuf[ebuflen-1]='\0';
1471 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1472 if (file_descriptor<0)
1473 {
1474 return NULL;
1475 }
1477 uint32_t signature_offset;
1478 uint16_t lib_arch=0;
1479 bool failed_to_get_lib_arch=
1480 (
1481 //Go to position 3c in the dll
1482 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1483 ||
1484 // Read loacation of signature
1485 (sizeof(signature_offset)!=
1486 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1487 ||
1488 //Go to COFF File Header in dll
1489 //that is located after"signature" (4 bytes long)
1490 (os::seek_to_file_offset(file_descriptor,
1491 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1492 ||
1493 //Read field that contains code of architecture
1494 // that dll was build for
1495 (sizeof(lib_arch)!=
1496 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1497 );
1499 ::close(file_descriptor);
1500 if (failed_to_get_lib_arch)
1501 {
1502 // file i/o error - report os::lasterror(...) msg
1503 return NULL;
1504 }
1506 typedef struct
1507 {
1508 uint16_t arch_code;
1509 char* arch_name;
1510 } arch_t;
1512 static const arch_t arch_array[]={
1513 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1514 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1515 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1516 };
1517 #if (defined _M_IA64)
1518 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1519 #elif (defined _M_AMD64)
1520 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1521 #elif (defined _M_IX86)
1522 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1523 #else
1524 #error Method os::dll_load requires that one of following \
1525 is defined :_M_IA64,_M_AMD64 or _M_IX86
1526 #endif
1529 // Obtain a string for printf operation
1530 // lib_arch_str shall contain string what platform this .dll was built for
1531 // running_arch_str shall string contain what platform Hotspot was built for
1532 char *running_arch_str=NULL,*lib_arch_str=NULL;
1533 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1534 {
1535 if (lib_arch==arch_array[i].arch_code)
1536 lib_arch_str=arch_array[i].arch_name;
1537 if (running_arch==arch_array[i].arch_code)
1538 running_arch_str=arch_array[i].arch_name;
1539 }
1541 assert(running_arch_str,
1542 "Didn't find runing architecture code in arch_array");
1544 // If the architure is right
1545 // but some other error took place - report os::lasterror(...) msg
1546 if (lib_arch == running_arch)
1547 {
1548 return NULL;
1549 }
1551 if (lib_arch_str!=NULL)
1552 {
1553 ::_snprintf(ebuf, ebuflen-1,
1554 "Can't load %s-bit .dll on a %s-bit platform",
1555 lib_arch_str,running_arch_str);
1556 }
1557 else
1558 {
1559 // don't know what architecture this dll was build for
1560 ::_snprintf(ebuf, ebuflen-1,
1561 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1562 lib_arch,running_arch_str);
1563 }
1565 return NULL;
1566 }
1569 void os::print_dll_info(outputStream *st) {
1570 int pid = os::current_process_id();
1571 st->print_cr("Dynamic libraries:");
1572 enumerate_modules(pid, _print_module, (void *)st);
1573 }
1575 void os::print_os_info(outputStream* st) {
1576 st->print("OS:");
1578 OSVERSIONINFOEX osvi;
1579 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1580 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1582 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1583 st->print_cr("N/A");
1584 return;
1585 }
1587 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1588 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1589 switch (os_vers) {
1590 case 3051: st->print(" Windows NT 3.51"); break;
1591 case 4000: st->print(" Windows NT 4.0"); break;
1592 case 5000: st->print(" Windows 2000"); break;
1593 case 5001: st->print(" Windows XP"); break;
1594 case 5002:
1595 case 6000:
1596 case 6001: {
1597 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1598 // find out whether we are running on 64 bit processor or not.
1599 SYSTEM_INFO si;
1600 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1601 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1602 GetSystemInfo(&si);
1603 } else {
1604 os::Kernel32Dll::GetNativeSystemInfo(&si);
1605 }
1606 if (os_vers == 5002) {
1607 if (osvi.wProductType == VER_NT_WORKSTATION &&
1608 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1609 st->print(" Windows XP x64 Edition");
1610 else
1611 st->print(" Windows Server 2003 family");
1612 } else if (os_vers == 6000) {
1613 if (osvi.wProductType == VER_NT_WORKSTATION)
1614 st->print(" Windows Vista");
1615 else
1616 st->print(" Windows Server 2008");
1617 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1618 st->print(" , 64 bit");
1619 } else if (os_vers == 6001) {
1620 if (osvi.wProductType == VER_NT_WORKSTATION) {
1621 st->print(" Windows 7");
1622 } else {
1623 // Unrecognized windows, print out its major and minor versions
1624 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1625 }
1626 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1627 st->print(" , 64 bit");
1628 } else { // future os
1629 // Unrecognized windows, print out its major and minor versions
1630 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1631 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1632 st->print(" , 64 bit");
1633 }
1634 break;
1635 }
1636 default: // future windows, print out its major and minor versions
1637 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1638 }
1639 } else {
1640 switch (os_vers) {
1641 case 4000: st->print(" Windows 95"); break;
1642 case 4010: st->print(" Windows 98"); break;
1643 case 4090: st->print(" Windows Me"); break;
1644 default: // future windows, print out its major and minor versions
1645 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1646 }
1647 }
1648 st->print(" Build %d", osvi.dwBuildNumber);
1649 st->print(" %s", osvi.szCSDVersion); // service pack
1650 st->cr();
1651 }
1653 void os::pd_print_cpu_info(outputStream* st) {
1654 // Nothing to do for now.
1655 }
1657 void os::print_memory_info(outputStream* st) {
1658 st->print("Memory:");
1659 st->print(" %dk page", os::vm_page_size()>>10);
1661 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1662 // value if total memory is larger than 4GB
1663 MEMORYSTATUSEX ms;
1664 ms.dwLength = sizeof(ms);
1665 GlobalMemoryStatusEx(&ms);
1667 st->print(", physical %uk", os::physical_memory() >> 10);
1668 st->print("(%uk free)", os::available_memory() >> 10);
1670 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1671 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1672 st->cr();
1673 }
1675 void os::print_siginfo(outputStream *st, void *siginfo) {
1676 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1677 st->print("siginfo:");
1678 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1680 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1681 er->NumberParameters >= 2) {
1682 switch (er->ExceptionInformation[0]) {
1683 case 0: st->print(", reading address"); break;
1684 case 1: st->print(", writing address"); break;
1685 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1686 er->ExceptionInformation[0]);
1687 }
1688 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1689 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1690 er->NumberParameters >= 2 && UseSharedSpaces) {
1691 FileMapInfo* mapinfo = FileMapInfo::current_info();
1692 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1693 st->print("\n\nError accessing class data sharing archive." \
1694 " Mapped file inaccessible during execution, " \
1695 " possible disk/network problem.");
1696 }
1697 } else {
1698 int num = er->NumberParameters;
1699 if (num > 0) {
1700 st->print(", ExceptionInformation=");
1701 for (int i = 0; i < num; i++) {
1702 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1703 }
1704 }
1705 }
1706 st->cr();
1707 }
1709 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1710 // do nothing
1711 }
1713 static char saved_jvm_path[MAX_PATH] = {0};
1715 // Find the full path to the current module, jvm.dll or jvm_g.dll
1716 void os::jvm_path(char *buf, jint buflen) {
1717 // Error checking.
1718 if (buflen < MAX_PATH) {
1719 assert(false, "must use a large-enough buffer");
1720 buf[0] = '\0';
1721 return;
1722 }
1723 // Lazy resolve the path to current module.
1724 if (saved_jvm_path[0] != 0) {
1725 strcpy(buf, saved_jvm_path);
1726 return;
1727 }
1729 buf[0] = '\0';
1730 if (Arguments::created_by_gamma_launcher()) {
1731 // Support for the gamma launcher. Check for an
1732 // JAVA_HOME environment variable
1733 // and fix up the path so it looks like
1734 // libjvm.so is installed there (append a fake suffix
1735 // hotspot/libjvm.so).
1736 char* java_home_var = ::getenv("JAVA_HOME");
1737 if (java_home_var != NULL && java_home_var[0] != 0) {
1739 strncpy(buf, java_home_var, buflen);
1741 // determine if this is a legacy image or modules image
1742 // modules image doesn't have "jre" subdirectory
1743 size_t len = strlen(buf);
1744 char* jrebin_p = buf + len;
1745 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1746 if (0 != _access(buf, 0)) {
1747 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1748 }
1749 len = strlen(buf);
1750 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1751 }
1752 }
1754 if(buf[0] == '\0') {
1755 GetModuleFileName(vm_lib_handle, buf, buflen);
1756 }
1757 strcpy(saved_jvm_path, buf);
1758 }
1761 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1762 #ifndef _WIN64
1763 st->print("_");
1764 #endif
1765 }
1768 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1769 #ifndef _WIN64
1770 st->print("@%d", args_size * sizeof(int));
1771 #endif
1772 }
1774 // This method is a copy of JDK's sysGetLastErrorString
1775 // from src/windows/hpi/src/system_md.c
1777 size_t os::lasterror(char* buf, size_t len) {
1778 DWORD errval;
1780 if ((errval = GetLastError()) != 0) {
1781 // DOS error
1782 size_t n = (size_t)FormatMessage(
1783 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1784 NULL,
1785 errval,
1786 0,
1787 buf,
1788 (DWORD)len,
1789 NULL);
1790 if (n > 3) {
1791 // Drop final '.', CR, LF
1792 if (buf[n - 1] == '\n') n--;
1793 if (buf[n - 1] == '\r') n--;
1794 if (buf[n - 1] == '.') n--;
1795 buf[n] = '\0';
1796 }
1797 return n;
1798 }
1800 if (errno != 0) {
1801 // C runtime error that has no corresponding DOS error code
1802 const char* s = strerror(errno);
1803 size_t n = strlen(s);
1804 if (n >= len) n = len - 1;
1805 strncpy(buf, s, n);
1806 buf[n] = '\0';
1807 return n;
1808 }
1810 return 0;
1811 }
1813 int os::get_last_error() {
1814 DWORD error = GetLastError();
1815 if (error == 0)
1816 error = errno;
1817 return (int)error;
1818 }
1820 // sun.misc.Signal
1821 // NOTE that this is a workaround for an apparent kernel bug where if
1822 // a signal handler for SIGBREAK is installed then that signal handler
1823 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1824 // See bug 4416763.
1825 static void (*sigbreakHandler)(int) = NULL;
1827 static void UserHandler(int sig, void *siginfo, void *context) {
1828 os::signal_notify(sig);
1829 // We need to reinstate the signal handler each time...
1830 os::signal(sig, (void*)UserHandler);
1831 }
1833 void* os::user_handler() {
1834 return (void*) UserHandler;
1835 }
1837 void* os::signal(int signal_number, void* handler) {
1838 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1839 void (*oldHandler)(int) = sigbreakHandler;
1840 sigbreakHandler = (void (*)(int)) handler;
1841 return (void*) oldHandler;
1842 } else {
1843 return (void*)::signal(signal_number, (void (*)(int))handler);
1844 }
1845 }
1847 void os::signal_raise(int signal_number) {
1848 raise(signal_number);
1849 }
1851 // The Win32 C runtime library maps all console control events other than ^C
1852 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1853 // logoff, and shutdown events. We therefore install our own console handler
1854 // that raises SIGTERM for the latter cases.
1855 //
1856 static BOOL WINAPI consoleHandler(DWORD event) {
1857 switch(event) {
1858 case CTRL_C_EVENT:
1859 if (is_error_reported()) {
1860 // Ctrl-C is pressed during error reporting, likely because the error
1861 // handler fails to abort. Let VM die immediately.
1862 os::die();
1863 }
1865 os::signal_raise(SIGINT);
1866 return TRUE;
1867 break;
1868 case CTRL_BREAK_EVENT:
1869 if (sigbreakHandler != NULL) {
1870 (*sigbreakHandler)(SIGBREAK);
1871 }
1872 return TRUE;
1873 break;
1874 case CTRL_CLOSE_EVENT:
1875 case CTRL_LOGOFF_EVENT:
1876 case CTRL_SHUTDOWN_EVENT:
1877 os::signal_raise(SIGTERM);
1878 return TRUE;
1879 break;
1880 default:
1881 break;
1882 }
1883 return FALSE;
1884 }
1886 /*
1887 * The following code is moved from os.cpp for making this
1888 * code platform specific, which it is by its very nature.
1889 */
1891 // Return maximum OS signal used + 1 for internal use only
1892 // Used as exit signal for signal_thread
1893 int os::sigexitnum_pd(){
1894 return NSIG;
1895 }
1897 // a counter for each possible signal value, including signal_thread exit signal
1898 static volatile jint pending_signals[NSIG+1] = { 0 };
1899 static HANDLE sig_sem;
1901 void os::signal_init_pd() {
1902 // Initialize signal structures
1903 memset((void*)pending_signals, 0, sizeof(pending_signals));
1905 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1907 // Programs embedding the VM do not want it to attempt to receive
1908 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1909 // shutdown hooks mechanism introduced in 1.3. For example, when
1910 // the VM is run as part of a Windows NT service (i.e., a servlet
1911 // engine in a web server), the correct behavior is for any console
1912 // control handler to return FALSE, not TRUE, because the OS's
1913 // "final" handler for such events allows the process to continue if
1914 // it is a service (while terminating it if it is not a service).
1915 // To make this behavior uniform and the mechanism simpler, we
1916 // completely disable the VM's usage of these console events if -Xrs
1917 // (=ReduceSignalUsage) is specified. This means, for example, that
1918 // the CTRL-BREAK thread dump mechanism is also disabled in this
1919 // case. See bugs 4323062, 4345157, and related bugs.
1921 if (!ReduceSignalUsage) {
1922 // Add a CTRL-C handler
1923 SetConsoleCtrlHandler(consoleHandler, TRUE);
1924 }
1925 }
1927 void os::signal_notify(int signal_number) {
1928 BOOL ret;
1930 Atomic::inc(&pending_signals[signal_number]);
1931 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1932 assert(ret != 0, "ReleaseSemaphore() failed");
1933 }
1935 static int check_pending_signals(bool wait_for_signal) {
1936 DWORD ret;
1937 while (true) {
1938 for (int i = 0; i < NSIG + 1; i++) {
1939 jint n = pending_signals[i];
1940 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1941 return i;
1942 }
1943 }
1944 if (!wait_for_signal) {
1945 return -1;
1946 }
1948 JavaThread *thread = JavaThread::current();
1950 ThreadBlockInVM tbivm(thread);
1952 bool threadIsSuspended;
1953 do {
1954 thread->set_suspend_equivalent();
1955 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1956 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1957 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1959 // were we externally suspended while we were waiting?
1960 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1961 if (threadIsSuspended) {
1962 //
1963 // The semaphore has been incremented, but while we were waiting
1964 // another thread suspended us. We don't want to continue running
1965 // while suspended because that would surprise the thread that
1966 // suspended us.
1967 //
1968 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1969 assert(ret != 0, "ReleaseSemaphore() failed");
1971 thread->java_suspend_self();
1972 }
1973 } while (threadIsSuspended);
1974 }
1975 }
1977 int os::signal_lookup() {
1978 return check_pending_signals(false);
1979 }
1981 int os::signal_wait() {
1982 return check_pending_signals(true);
1983 }
1985 // Implicit OS exception handling
1987 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1988 JavaThread* thread = JavaThread::current();
1989 // Save pc in thread
1990 #ifdef _M_IA64
1991 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1992 // Set pc to handler
1993 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1994 #elif _M_AMD64
1995 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1996 // Set pc to handler
1997 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1998 #else
1999 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
2000 // Set pc to handler
2001 exceptionInfo->ContextRecord->Eip = (LONG)handler;
2002 #endif
2004 // Continue the execution
2005 return EXCEPTION_CONTINUE_EXECUTION;
2006 }
2009 // Used for PostMortemDump
2010 extern "C" void safepoints();
2011 extern "C" void find(int x);
2012 extern "C" void events();
2014 // According to Windows API documentation, an illegal instruction sequence should generate
2015 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2016 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2017 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2019 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2021 // From "Execution Protection in the Windows Operating System" draft 0.35
2022 // Once a system header becomes available, the "real" define should be
2023 // included or copied here.
2024 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2026 #define def_excpt(val) #val, val
2028 struct siglabel {
2029 char *name;
2030 int number;
2031 };
2033 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2034 // C++ compiler contain this error code. Because this is a compiler-generated
2035 // error, the code is not listed in the Win32 API header files.
2036 // The code is actually a cryptic mnemonic device, with the initial "E"
2037 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2038 // ASCII values of "msc".
2040 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2043 struct siglabel exceptlabels[] = {
2044 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2045 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2046 def_excpt(EXCEPTION_BREAKPOINT),
2047 def_excpt(EXCEPTION_SINGLE_STEP),
2048 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2049 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2050 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2051 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2052 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2053 def_excpt(EXCEPTION_FLT_OVERFLOW),
2054 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2055 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2056 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2057 def_excpt(EXCEPTION_INT_OVERFLOW),
2058 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2059 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2060 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2061 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2062 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2063 def_excpt(EXCEPTION_STACK_OVERFLOW),
2064 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2065 def_excpt(EXCEPTION_GUARD_PAGE),
2066 def_excpt(EXCEPTION_INVALID_HANDLE),
2067 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2068 NULL, 0
2069 };
2071 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2072 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2073 if (exceptlabels[i].number == exception_code) {
2074 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2075 return buf;
2076 }
2077 }
2079 return NULL;
2080 }
2082 //-----------------------------------------------------------------------------
2083 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2084 // handle exception caused by idiv; should only happen for -MinInt/-1
2085 // (division by zero is handled explicitly)
2086 #ifdef _M_IA64
2087 assert(0, "Fix Handle_IDiv_Exception");
2088 #elif _M_AMD64
2089 PCONTEXT ctx = exceptionInfo->ContextRecord;
2090 address pc = (address)ctx->Rip;
2091 assert(pc[0] == 0xF7, "not an idiv opcode");
2092 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2093 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2094 // set correct result values and continue after idiv instruction
2095 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2096 ctx->Rax = (DWORD)min_jint; // result
2097 ctx->Rdx = (DWORD)0; // remainder
2098 // Continue the execution
2099 #else
2100 PCONTEXT ctx = exceptionInfo->ContextRecord;
2101 address pc = (address)ctx->Eip;
2102 assert(pc[0] == 0xF7, "not an idiv opcode");
2103 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2104 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2105 // set correct result values and continue after idiv instruction
2106 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2107 ctx->Eax = (DWORD)min_jint; // result
2108 ctx->Edx = (DWORD)0; // remainder
2109 // Continue the execution
2110 #endif
2111 return EXCEPTION_CONTINUE_EXECUTION;
2112 }
2114 #ifndef _WIN64
2115 //-----------------------------------------------------------------------------
2116 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2117 // handle exception caused by native method modifying control word
2118 PCONTEXT ctx = exceptionInfo->ContextRecord;
2119 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2121 switch (exception_code) {
2122 case EXCEPTION_FLT_DENORMAL_OPERAND:
2123 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2124 case EXCEPTION_FLT_INEXACT_RESULT:
2125 case EXCEPTION_FLT_INVALID_OPERATION:
2126 case EXCEPTION_FLT_OVERFLOW:
2127 case EXCEPTION_FLT_STACK_CHECK:
2128 case EXCEPTION_FLT_UNDERFLOW:
2129 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2130 if (fp_control_word != ctx->FloatSave.ControlWord) {
2131 // Restore FPCW and mask out FLT exceptions
2132 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2133 // Mask out pending FLT exceptions
2134 ctx->FloatSave.StatusWord &= 0xffffff00;
2135 return EXCEPTION_CONTINUE_EXECUTION;
2136 }
2137 }
2139 if (prev_uef_handler != NULL) {
2140 // We didn't handle this exception so pass it to the previous
2141 // UnhandledExceptionFilter.
2142 return (prev_uef_handler)(exceptionInfo);
2143 }
2145 return EXCEPTION_CONTINUE_SEARCH;
2146 }
2147 #else //_WIN64
2148 /*
2149 On Windows, the mxcsr control bits are non-volatile across calls
2150 See also CR 6192333
2151 If EXCEPTION_FLT_* happened after some native method modified
2152 mxcsr - it is not a jvm fault.
2153 However should we decide to restore of mxcsr after a faulty
2154 native method we can uncomment following code
2155 jint MxCsr = INITIAL_MXCSR;
2156 // we can't use StubRoutines::addr_mxcsr_std()
2157 // because in Win64 mxcsr is not saved there
2158 if (MxCsr != ctx->MxCsr) {
2159 ctx->MxCsr = MxCsr;
2160 return EXCEPTION_CONTINUE_EXECUTION;
2161 }
2163 */
2164 #endif //_WIN64
2167 // Fatal error reporting is single threaded so we can make this a
2168 // static and preallocated. If it's more than MAX_PATH silently ignore
2169 // it.
2170 static char saved_error_file[MAX_PATH] = {0};
2172 void os::set_error_file(const char *logfile) {
2173 if (strlen(logfile) <= MAX_PATH) {
2174 strncpy(saved_error_file, logfile, MAX_PATH);
2175 }
2176 }
2178 static inline void report_error(Thread* t, DWORD exception_code,
2179 address addr, void* siginfo, void* context) {
2180 VMError err(t, exception_code, addr, siginfo, context);
2181 err.report_and_die();
2183 // If UseOsErrorReporting, this will return here and save the error file
2184 // somewhere where we can find it in the minidump.
2185 }
2187 //-----------------------------------------------------------------------------
2188 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2189 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2190 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2191 #ifdef _M_IA64
2192 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2193 #elif _M_AMD64
2194 address pc = (address) exceptionInfo->ContextRecord->Rip;
2195 #else
2196 address pc = (address) exceptionInfo->ContextRecord->Eip;
2197 #endif
2198 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2200 #ifndef _WIN64
2201 // Execution protection violation - win32 running on AMD64 only
2202 // Handled first to avoid misdiagnosis as a "normal" access violation;
2203 // This is safe to do because we have a new/unique ExceptionInformation
2204 // code for this condition.
2205 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2206 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2207 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2208 address addr = (address) exceptionRecord->ExceptionInformation[1];
2210 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2211 int page_size = os::vm_page_size();
2213 // Make sure the pc and the faulting address are sane.
2214 //
2215 // If an instruction spans a page boundary, and the page containing
2216 // the beginning of the instruction is executable but the following
2217 // page is not, the pc and the faulting address might be slightly
2218 // different - we still want to unguard the 2nd page in this case.
2219 //
2220 // 15 bytes seems to be a (very) safe value for max instruction size.
2221 bool pc_is_near_addr =
2222 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2223 bool instr_spans_page_boundary =
2224 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2225 (intptr_t) page_size) > 0);
2227 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2228 static volatile address last_addr =
2229 (address) os::non_memory_address_word();
2231 // In conservative mode, don't unguard unless the address is in the VM
2232 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2233 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2235 // Set memory to RWX and retry
2236 address page_start =
2237 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2238 bool res = os::protect_memory((char*) page_start, page_size,
2239 os::MEM_PROT_RWX);
2241 if (PrintMiscellaneous && Verbose) {
2242 char buf[256];
2243 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2244 "at " INTPTR_FORMAT
2245 ", unguarding " INTPTR_FORMAT ": %s", addr,
2246 page_start, (res ? "success" : strerror(errno)));
2247 tty->print_raw_cr(buf);
2248 }
2250 // Set last_addr so if we fault again at the same address, we don't
2251 // end up in an endless loop.
2252 //
2253 // There are two potential complications here. Two threads trapping
2254 // at the same address at the same time could cause one of the
2255 // threads to think it already unguarded, and abort the VM. Likely
2256 // very rare.
2257 //
2258 // The other race involves two threads alternately trapping at
2259 // different addresses and failing to unguard the page, resulting in
2260 // an endless loop. This condition is probably even more unlikely
2261 // than the first.
2262 //
2263 // Although both cases could be avoided by using locks or thread
2264 // local last_addr, these solutions are unnecessary complication:
2265 // this handler is a best-effort safety net, not a complete solution.
2266 // It is disabled by default and should only be used as a workaround
2267 // in case we missed any no-execute-unsafe VM code.
2269 last_addr = addr;
2271 return EXCEPTION_CONTINUE_EXECUTION;
2272 }
2273 }
2275 // Last unguard failed or not unguarding
2276 tty->print_raw_cr("Execution protection violation");
2277 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2278 exceptionInfo->ContextRecord);
2279 return EXCEPTION_CONTINUE_SEARCH;
2280 }
2281 }
2282 #endif // _WIN64
2284 // Check to see if we caught the safepoint code in the
2285 // process of write protecting the memory serialization page.
2286 // It write enables the page immediately after protecting it
2287 // so just return.
2288 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2289 JavaThread* thread = (JavaThread*) t;
2290 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2291 address addr = (address) exceptionRecord->ExceptionInformation[1];
2292 if ( os::is_memory_serialize_page(thread, addr) ) {
2293 // Block current thread until the memory serialize page permission restored.
2294 os::block_on_serialize_page_trap();
2295 return EXCEPTION_CONTINUE_EXECUTION;
2296 }
2297 }
2299 if (t != NULL && t->is_Java_thread()) {
2300 JavaThread* thread = (JavaThread*) t;
2301 bool in_java = thread->thread_state() == _thread_in_Java;
2303 // Handle potential stack overflows up front.
2304 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2305 if (os::uses_stack_guard_pages()) {
2306 #ifdef _M_IA64
2307 //
2308 // If it's a legal stack address continue, Windows will map it in.
2309 //
2310 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2311 address addr = (address) exceptionRecord->ExceptionInformation[1];
2312 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2313 return EXCEPTION_CONTINUE_EXECUTION;
2315 // The register save area is the same size as the memory stack
2316 // and starts at the page just above the start of the memory stack.
2317 // If we get a fault in this area, we've run out of register
2318 // stack. If we are in java, try throwing a stack overflow exception.
2319 if (addr > thread->stack_base() &&
2320 addr <= (thread->stack_base()+thread->stack_size()) ) {
2321 char buf[256];
2322 jio_snprintf(buf, sizeof(buf),
2323 "Register stack overflow, addr:%p, stack_base:%p\n",
2324 addr, thread->stack_base() );
2325 tty->print_raw_cr(buf);
2326 // If not in java code, return and hope for the best.
2327 return in_java ? Handle_Exception(exceptionInfo,
2328 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2329 : EXCEPTION_CONTINUE_EXECUTION;
2330 }
2331 #endif
2332 if (thread->stack_yellow_zone_enabled()) {
2333 // Yellow zone violation. The o/s has unprotected the first yellow
2334 // zone page for us. Note: must call disable_stack_yellow_zone to
2335 // update the enabled status, even if the zone contains only one page.
2336 thread->disable_stack_yellow_zone();
2337 // If not in java code, return and hope for the best.
2338 return in_java ? Handle_Exception(exceptionInfo,
2339 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2340 : EXCEPTION_CONTINUE_EXECUTION;
2341 } else {
2342 // Fatal red zone violation.
2343 thread->disable_stack_red_zone();
2344 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2345 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2346 exceptionInfo->ContextRecord);
2347 return EXCEPTION_CONTINUE_SEARCH;
2348 }
2349 } else if (in_java) {
2350 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2351 // a one-time-only guard page, which it has released to us. The next
2352 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2353 return Handle_Exception(exceptionInfo,
2354 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2355 } else {
2356 // Can only return and hope for the best. Further stack growth will
2357 // result in an ACCESS_VIOLATION.
2358 return EXCEPTION_CONTINUE_EXECUTION;
2359 }
2360 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2361 // Either stack overflow or null pointer exception.
2362 if (in_java) {
2363 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2364 address addr = (address) exceptionRecord->ExceptionInformation[1];
2365 address stack_end = thread->stack_base() - thread->stack_size();
2366 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2367 // Stack overflow.
2368 assert(!os::uses_stack_guard_pages(),
2369 "should be caught by red zone code above.");
2370 return Handle_Exception(exceptionInfo,
2371 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2372 }
2373 //
2374 // Check for safepoint polling and implicit null
2375 // We only expect null pointers in the stubs (vtable)
2376 // the rest are checked explicitly now.
2377 //
2378 CodeBlob* cb = CodeCache::find_blob(pc);
2379 if (cb != NULL) {
2380 if (os::is_poll_address(addr)) {
2381 address stub = SharedRuntime::get_poll_stub(pc);
2382 return Handle_Exception(exceptionInfo, stub);
2383 }
2384 }
2385 {
2386 #ifdef _WIN64
2387 //
2388 // If it's a legal stack address map the entire region in
2389 //
2390 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2391 address addr = (address) exceptionRecord->ExceptionInformation[1];
2392 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2393 addr = (address)((uintptr_t)addr &
2394 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2395 os::commit_memory((char *)addr, thread->stack_base() - addr,
2396 false );
2397 return EXCEPTION_CONTINUE_EXECUTION;
2398 }
2399 else
2400 #endif
2401 {
2402 // Null pointer exception.
2403 #ifdef _M_IA64
2404 // We catch register stack overflows in compiled code by doing
2405 // an explicit compare and executing a st8(G0, G0) if the
2406 // BSP enters into our guard area. We test for the overflow
2407 // condition and fall into the normal null pointer exception
2408 // code if BSP hasn't overflowed.
2409 if ( in_java ) {
2410 if(thread->register_stack_overflow()) {
2411 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2412 thread->register_stack_limit(),
2413 "GR7 doesn't contain register_stack_limit");
2414 // Disable the yellow zone which sets the state that
2415 // we've got a stack overflow problem.
2416 if (thread->stack_yellow_zone_enabled()) {
2417 thread->disable_stack_yellow_zone();
2418 }
2419 // Give us some room to process the exception
2420 thread->disable_register_stack_guard();
2421 // Update GR7 with the new limit so we can continue running
2422 // compiled code.
2423 exceptionInfo->ContextRecord->IntS3 =
2424 (ULONGLONG)thread->register_stack_limit();
2425 return Handle_Exception(exceptionInfo,
2426 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2427 } else {
2428 //
2429 // Check for implicit null
2430 // We only expect null pointers in the stubs (vtable)
2431 // the rest are checked explicitly now.
2432 //
2433 if (((uintptr_t)addr) < os::vm_page_size() ) {
2434 // an access to the first page of VM--assume it is a null pointer
2435 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2436 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2437 }
2438 }
2439 } // in_java
2441 // IA64 doesn't use implicit null checking yet. So we shouldn't
2442 // get here.
2443 tty->print_raw_cr("Access violation, possible null pointer exception");
2444 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2445 exceptionInfo->ContextRecord);
2446 return EXCEPTION_CONTINUE_SEARCH;
2447 #else /* !IA64 */
2449 // Windows 98 reports faulting addresses incorrectly
2450 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2451 !os::win32::is_nt()) {
2452 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2453 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2454 }
2455 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2456 exceptionInfo->ContextRecord);
2457 return EXCEPTION_CONTINUE_SEARCH;
2458 #endif
2459 }
2460 }
2461 }
2463 #ifdef _WIN64
2464 // Special care for fast JNI field accessors.
2465 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2466 // in and the heap gets shrunk before the field access.
2467 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2468 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2469 if (addr != (address)-1) {
2470 return Handle_Exception(exceptionInfo, addr);
2471 }
2472 }
2473 #endif
2475 #ifdef _WIN64
2476 // Windows will sometimes generate an access violation
2477 // when we call malloc. Since we use VectoredExceptions
2478 // on 64 bit platforms, we see this exception. We must
2479 // pass this exception on so Windows can recover.
2480 // We check to see if the pc of the fault is in NTDLL.DLL
2481 // if so, we pass control on to Windows for handling.
2482 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2483 #endif
2485 // Stack overflow or null pointer exception in native code.
2486 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2487 exceptionInfo->ContextRecord);
2488 return EXCEPTION_CONTINUE_SEARCH;
2489 }
2491 if (in_java) {
2492 switch (exception_code) {
2493 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2494 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2496 case EXCEPTION_INT_OVERFLOW:
2497 return Handle_IDiv_Exception(exceptionInfo);
2499 } // switch
2500 }
2501 #ifndef _WIN64
2502 if (((thread->thread_state() == _thread_in_Java) ||
2503 (thread->thread_state() == _thread_in_native)) &&
2504 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2505 {
2506 LONG result=Handle_FLT_Exception(exceptionInfo);
2507 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2508 }
2509 #endif //_WIN64
2510 }
2512 if (exception_code != EXCEPTION_BREAKPOINT) {
2513 #ifndef _WIN64
2514 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2515 exceptionInfo->ContextRecord);
2516 #else
2517 // Itanium Windows uses a VectoredExceptionHandler
2518 // Which means that C++ programatic exception handlers (try/except)
2519 // will get here. Continue the search for the right except block if
2520 // the exception code is not a fatal code.
2521 switch ( exception_code ) {
2522 case EXCEPTION_ACCESS_VIOLATION:
2523 case EXCEPTION_STACK_OVERFLOW:
2524 case EXCEPTION_ILLEGAL_INSTRUCTION:
2525 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2526 case EXCEPTION_INT_OVERFLOW:
2527 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2528 case EXCEPTION_UNCAUGHT_CXX_EXCEPTION:
2529 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2530 exceptionInfo->ContextRecord);
2531 }
2532 break;
2533 default:
2534 break;
2535 }
2536 #endif
2537 }
2538 return EXCEPTION_CONTINUE_SEARCH;
2539 }
2541 #ifndef _WIN64
2542 // Special care for fast JNI accessors.
2543 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2544 // the heap gets shrunk before the field access.
2545 // Need to install our own structured exception handler since native code may
2546 // install its own.
2547 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2548 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2549 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2550 address pc = (address) exceptionInfo->ContextRecord->Eip;
2551 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2552 if (addr != (address)-1) {
2553 return Handle_Exception(exceptionInfo, addr);
2554 }
2555 }
2556 return EXCEPTION_CONTINUE_SEARCH;
2557 }
2559 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2560 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2561 __try { \
2562 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2563 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2564 } \
2565 return 0; \
2566 }
2568 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2569 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2570 DEFINE_FAST_GETFIELD(jchar, char, Char)
2571 DEFINE_FAST_GETFIELD(jshort, short, Short)
2572 DEFINE_FAST_GETFIELD(jint, int, Int)
2573 DEFINE_FAST_GETFIELD(jlong, long, Long)
2574 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2575 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2577 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2578 switch (type) {
2579 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2580 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2581 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2582 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2583 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2584 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2585 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2586 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2587 default: ShouldNotReachHere();
2588 }
2589 return (address)-1;
2590 }
2591 #endif
2593 // Virtual Memory
2595 int os::vm_page_size() { return os::win32::vm_page_size(); }
2596 int os::vm_allocation_granularity() {
2597 return os::win32::vm_allocation_granularity();
2598 }
2600 // Windows large page support is available on Windows 2003. In order to use
2601 // large page memory, the administrator must first assign additional privilege
2602 // to the user:
2603 // + select Control Panel -> Administrative Tools -> Local Security Policy
2604 // + select Local Policies -> User Rights Assignment
2605 // + double click "Lock pages in memory", add users and/or groups
2606 // + reboot
2607 // Note the above steps are needed for administrator as well, as administrators
2608 // by default do not have the privilege to lock pages in memory.
2609 //
2610 // Note about Windows 2003: although the API supports committing large page
2611 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2612 // scenario, I found through experiment it only uses large page if the entire
2613 // memory region is reserved and committed in a single VirtualAlloc() call.
2614 // This makes Windows large page support more or less like Solaris ISM, in
2615 // that the entire heap must be committed upfront. This probably will change
2616 // in the future, if so the code below needs to be revisited.
2618 #ifndef MEM_LARGE_PAGES
2619 #define MEM_LARGE_PAGES 0x20000000
2620 #endif
2622 static HANDLE _hProcess;
2623 static HANDLE _hToken;
2625 // Container for NUMA node list info
2626 class NUMANodeListHolder {
2627 private:
2628 int *_numa_used_node_list; // allocated below
2629 int _numa_used_node_count;
2631 void free_node_list() {
2632 if (_numa_used_node_list != NULL) {
2633 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2634 }
2635 }
2637 public:
2638 NUMANodeListHolder() {
2639 _numa_used_node_count = 0;
2640 _numa_used_node_list = NULL;
2641 // do rest of initialization in build routine (after function pointers are set up)
2642 }
2644 ~NUMANodeListHolder() {
2645 free_node_list();
2646 }
2648 bool build() {
2649 DWORD_PTR proc_aff_mask;
2650 DWORD_PTR sys_aff_mask;
2651 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2652 ULONG highest_node_number;
2653 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2654 free_node_list();
2655 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1);
2656 for (unsigned int i = 0; i <= highest_node_number; i++) {
2657 ULONGLONG proc_mask_numa_node;
2658 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2659 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2660 _numa_used_node_list[_numa_used_node_count++] = i;
2661 }
2662 }
2663 return (_numa_used_node_count > 1);
2664 }
2666 int get_count() {return _numa_used_node_count;}
2667 int get_node_list_entry(int n) {
2668 // for indexes out of range, returns -1
2669 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2670 }
2672 } numa_node_list_holder;
2676 static size_t _large_page_size = 0;
2678 static bool resolve_functions_for_large_page_init() {
2679 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2680 os::Advapi32Dll::AdvapiAvailable();
2681 }
2683 static bool request_lock_memory_privilege() {
2684 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2685 os::current_process_id());
2687 LUID luid;
2688 if (_hProcess != NULL &&
2689 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2690 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2692 TOKEN_PRIVILEGES tp;
2693 tp.PrivilegeCount = 1;
2694 tp.Privileges[0].Luid = luid;
2695 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2697 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2698 // privilege. Check GetLastError() too. See MSDN document.
2699 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2700 (GetLastError() == ERROR_SUCCESS)) {
2701 return true;
2702 }
2703 }
2705 return false;
2706 }
2708 static void cleanup_after_large_page_init() {
2709 if (_hProcess) CloseHandle(_hProcess);
2710 _hProcess = NULL;
2711 if (_hToken) CloseHandle(_hToken);
2712 _hToken = NULL;
2713 }
2715 static bool numa_interleaving_init() {
2716 bool success = false;
2717 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2719 // print a warning if UseNUMAInterleaving flag is specified on command line
2720 bool warn_on_failure = use_numa_interleaving_specified;
2721 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2723 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2724 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2725 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2727 if (os::Kernel32Dll::NumaCallsAvailable()) {
2728 if (numa_node_list_holder.build()) {
2729 if (PrintMiscellaneous && Verbose) {
2730 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2731 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2732 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2733 }
2734 tty->print("\n");
2735 }
2736 success = true;
2737 } else {
2738 WARN("Process does not cover multiple NUMA nodes.");
2739 }
2740 } else {
2741 WARN("NUMA Interleaving is not supported by the operating system.");
2742 }
2743 if (!success) {
2744 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2745 }
2746 return success;
2747 #undef WARN
2748 }
2750 // this routine is used whenever we need to reserve a contiguous VA range
2751 // but we need to make separate VirtualAlloc calls for each piece of the range
2752 // Reasons for doing this:
2753 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2754 // * UseNUMAInterleaving requires a separate node for each piece
2755 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2756 bool should_inject_error=false) {
2757 char * p_buf;
2758 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2759 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2760 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2762 // first reserve enough address space in advance since we want to be
2763 // able to break a single contiguous virtual address range into multiple
2764 // large page commits but WS2003 does not allow reserving large page space
2765 // so we just use 4K pages for reserve, this gives us a legal contiguous
2766 // address space. then we will deallocate that reservation, and re alloc
2767 // using large pages
2768 const size_t size_of_reserve = bytes + chunk_size;
2769 if (bytes > size_of_reserve) {
2770 // Overflowed.
2771 return NULL;
2772 }
2773 p_buf = (char *) VirtualAlloc(addr,
2774 size_of_reserve, // size of Reserve
2775 MEM_RESERVE,
2776 PAGE_READWRITE);
2777 // If reservation failed, return NULL
2778 if (p_buf == NULL) return NULL;
2780 os::release_memory(p_buf, bytes + chunk_size);
2782 // we still need to round up to a page boundary (in case we are using large pages)
2783 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2784 // instead we handle this in the bytes_to_rq computation below
2785 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2787 // now go through and allocate one chunk at a time until all bytes are
2788 // allocated
2789 size_t bytes_remaining = bytes;
2790 // An overflow of align_size_up() would have been caught above
2791 // in the calculation of size_of_reserve.
2792 char * next_alloc_addr = p_buf;
2793 HANDLE hProc = GetCurrentProcess();
2795 #ifdef ASSERT
2796 // Variable for the failure injection
2797 long ran_num = os::random();
2798 size_t fail_after = ran_num % bytes;
2799 #endif
2801 int count=0;
2802 while (bytes_remaining) {
2803 // select bytes_to_rq to get to the next chunk_size boundary
2805 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2806 // Note allocate and commit
2807 char * p_new;
2809 #ifdef ASSERT
2810 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2811 #else
2812 const bool inject_error_now = false;
2813 #endif
2815 if (inject_error_now) {
2816 p_new = NULL;
2817 } else {
2818 if (!UseNUMAInterleaving) {
2819 p_new = (char *) VirtualAlloc(next_alloc_addr,
2820 bytes_to_rq,
2821 flags,
2822 prot);
2823 } else {
2824 // get the next node to use from the used_node_list
2825 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2826 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2827 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2828 next_alloc_addr,
2829 bytes_to_rq,
2830 flags,
2831 prot,
2832 node);
2833 }
2834 }
2836 if (p_new == NULL) {
2837 // Free any allocated pages
2838 if (next_alloc_addr > p_buf) {
2839 // Some memory was committed so release it.
2840 size_t bytes_to_release = bytes - bytes_remaining;
2841 os::release_memory(p_buf, bytes_to_release);
2842 }
2843 #ifdef ASSERT
2844 if (should_inject_error) {
2845 if (TracePageSizes && Verbose) {
2846 tty->print_cr("Reserving pages individually failed.");
2847 }
2848 }
2849 #endif
2850 return NULL;
2851 }
2852 bytes_remaining -= bytes_to_rq;
2853 next_alloc_addr += bytes_to_rq;
2854 count++;
2855 }
2856 // made it this far, success
2857 return p_buf;
2858 }
2862 void os::large_page_init() {
2863 if (!UseLargePages) return;
2865 // print a warning if any large page related flag is specified on command line
2866 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2867 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2868 bool success = false;
2870 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2871 if (resolve_functions_for_large_page_init()) {
2872 if (request_lock_memory_privilege()) {
2873 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2874 if (s) {
2875 #if defined(IA32) || defined(AMD64)
2876 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2877 WARN("JVM cannot use large pages bigger than 4mb.");
2878 } else {
2879 #endif
2880 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2881 _large_page_size = LargePageSizeInBytes;
2882 } else {
2883 _large_page_size = s;
2884 }
2885 success = true;
2886 #if defined(IA32) || defined(AMD64)
2887 }
2888 #endif
2889 } else {
2890 WARN("Large page is not supported by the processor.");
2891 }
2892 } else {
2893 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2894 }
2895 } else {
2896 WARN("Large page is not supported by the operating system.");
2897 }
2898 #undef WARN
2900 const size_t default_page_size = (size_t) vm_page_size();
2901 if (success && _large_page_size > default_page_size) {
2902 _page_sizes[0] = _large_page_size;
2903 _page_sizes[1] = default_page_size;
2904 _page_sizes[2] = 0;
2905 }
2907 cleanup_after_large_page_init();
2908 UseLargePages = success;
2909 }
2911 // On win32, one cannot release just a part of reserved memory, it's an
2912 // all or nothing deal. When we split a reservation, we must break the
2913 // reservation into two reservations.
2914 void os::split_reserved_memory(char *base, size_t size, size_t split,
2915 bool realloc) {
2916 if (size > 0) {
2917 release_memory(base, size);
2918 if (realloc) {
2919 reserve_memory(split, base);
2920 }
2921 if (size != split) {
2922 reserve_memory(size - split, base + split);
2923 }
2924 }
2925 }
2927 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2928 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2929 "reserve alignment");
2930 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2931 char* res;
2932 // note that if UseLargePages is on, all the areas that require interleaving
2933 // will go thru reserve_memory_special rather than thru here.
2934 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
2935 if (!use_individual) {
2936 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2937 } else {
2938 elapsedTimer reserveTimer;
2939 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
2940 // in numa interleaving, we have to allocate pages individually
2941 // (well really chunks of NUMAInterleaveGranularity size)
2942 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
2943 if (res == NULL) {
2944 warning("NUMA page allocation failed");
2945 }
2946 if( Verbose && PrintMiscellaneous ) {
2947 reserveTimer.stop();
2948 tty->print_cr("reserve_memory of %Ix bytes took %ld ms (%ld ticks)", bytes,
2949 reserveTimer.milliseconds(), reserveTimer.ticks());
2950 }
2951 }
2952 assert(res == NULL || addr == NULL || addr == res,
2953 "Unexpected address from reserve.");
2955 return res;
2956 }
2958 // Reserve memory at an arbitrary address, only if that area is
2959 // available (and not reserved for something else).
2960 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2961 // Windows os::reserve_memory() fails of the requested address range is
2962 // not avilable.
2963 return reserve_memory(bytes, requested_addr);
2964 }
2966 size_t os::large_page_size() {
2967 return _large_page_size;
2968 }
2970 bool os::can_commit_large_page_memory() {
2971 // Windows only uses large page memory when the entire region is reserved
2972 // and committed in a single VirtualAlloc() call. This may change in the
2973 // future, but with Windows 2003 it's not possible to commit on demand.
2974 return false;
2975 }
2977 bool os::can_execute_large_page_memory() {
2978 return true;
2979 }
2981 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2983 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2984 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2986 // with large pages, there are two cases where we need to use Individual Allocation
2987 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
2988 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
2989 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
2990 if (TracePageSizes && Verbose) {
2991 tty->print_cr("Reserving large pages individually.");
2992 }
2993 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
2994 if (p_buf == NULL) {
2995 // give an appropriate warning message
2996 if (UseNUMAInterleaving) {
2997 warning("NUMA large page allocation failed, UseLargePages flag ignored");
2998 }
2999 if (UseLargePagesIndividualAllocation) {
3000 warning("Individually allocated large pages failed, "
3001 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3002 }
3003 return NULL;
3004 }
3006 return p_buf;
3008 } else {
3009 // normal policy just allocate it all at once
3010 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3011 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3012 return res;
3013 }
3014 }
3016 bool os::release_memory_special(char* base, size_t bytes) {
3017 return release_memory(base, bytes);
3018 }
3020 void os::print_statistics() {
3021 }
3023 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
3024 if (bytes == 0) {
3025 // Don't bother the OS with noops.
3026 return true;
3027 }
3028 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3029 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3030 // Don't attempt to print anything if the OS call fails. We're
3031 // probably low on resources, so the print itself may cause crashes.
3033 // unless we have NUMAInterleaving enabled, the range of a commit
3034 // is always within a reserve covered by a single VirtualAlloc
3035 // in that case we can just do a single commit for the requested size
3036 if (!UseNUMAInterleaving) {
3037 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3038 if (exec) {
3039 DWORD oldprot;
3040 // Windows doc says to use VirtualProtect to get execute permissions
3041 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3042 }
3043 return true;
3044 } else {
3046 // when NUMAInterleaving is enabled, the commit might cover a range that
3047 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3048 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3049 // returns represents the number of bytes that can be committed in one step.
3050 size_t bytes_remaining = bytes;
3051 char * next_alloc_addr = addr;
3052 while (bytes_remaining > 0) {
3053 MEMORY_BASIC_INFORMATION alloc_info;
3054 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3055 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3056 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3057 return false;
3058 if (exec) {
3059 DWORD oldprot;
3060 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3061 return false;
3062 }
3063 bytes_remaining -= bytes_to_rq;
3064 next_alloc_addr += bytes_to_rq;
3065 }
3066 }
3067 // if we made it this far, return true
3068 return true;
3069 }
3071 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
3072 bool exec) {
3073 return commit_memory(addr, size, exec);
3074 }
3076 bool os::uncommit_memory(char* addr, size_t bytes) {
3077 if (bytes == 0) {
3078 // Don't bother the OS with noops.
3079 return true;
3080 }
3081 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3082 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3083 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
3084 }
3086 bool os::release_memory(char* addr, size_t bytes) {
3087 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3088 }
3090 bool os::create_stack_guard_pages(char* addr, size_t size) {
3091 return os::commit_memory(addr, size);
3092 }
3094 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3095 return os::uncommit_memory(addr, size);
3096 }
3098 // Set protections specified
3099 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3100 bool is_committed) {
3101 unsigned int p = 0;
3102 switch (prot) {
3103 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3104 case MEM_PROT_READ: p = PAGE_READONLY; break;
3105 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3106 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3107 default:
3108 ShouldNotReachHere();
3109 }
3111 DWORD old_status;
3113 // Strange enough, but on Win32 one can change protection only for committed
3114 // memory, not a big deal anyway, as bytes less or equal than 64K
3115 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3116 fatal("cannot commit protection page");
3117 }
3118 // One cannot use os::guard_memory() here, as on Win32 guard page
3119 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3120 //
3121 // Pages in the region become guard pages. Any attempt to access a guard page
3122 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3123 // the guard page status. Guard pages thus act as a one-time access alarm.
3124 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3125 }
3127 bool os::guard_memory(char* addr, size_t bytes) {
3128 DWORD old_status;
3129 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3130 }
3132 bool os::unguard_memory(char* addr, size_t bytes) {
3133 DWORD old_status;
3134 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3135 }
3137 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3138 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3139 void os::numa_make_global(char *addr, size_t bytes) { }
3140 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3141 bool os::numa_topology_changed() { return false; }
3142 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3143 int os::numa_get_group_id() { return 0; }
3144 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3145 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3146 // Provide an answer for UMA systems
3147 ids[0] = 0;
3148 return 1;
3149 } else {
3150 // check for size bigger than actual groups_num
3151 size = MIN2(size, numa_get_groups_num());
3152 for (int i = 0; i < (int)size; i++) {
3153 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3154 }
3155 return size;
3156 }
3157 }
3159 bool os::get_page_info(char *start, page_info* info) {
3160 return false;
3161 }
3163 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3164 return end;
3165 }
3167 char* os::non_memory_address_word() {
3168 // Must never look like an address returned by reserve_memory,
3169 // even in its subfields (as defined by the CPU immediate fields,
3170 // if the CPU splits constants across multiple instructions).
3171 return (char*)-1;
3172 }
3174 #define MAX_ERROR_COUNT 100
3175 #define SYS_THREAD_ERROR 0xffffffffUL
3177 void os::pd_start_thread(Thread* thread) {
3178 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3179 // Returns previous suspend state:
3180 // 0: Thread was not suspended
3181 // 1: Thread is running now
3182 // >1: Thread is still suspended.
3183 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3184 }
3186 class HighResolutionInterval {
3187 // The default timer resolution seems to be 10 milliseconds.
3188 // (Where is this written down?)
3189 // If someone wants to sleep for only a fraction of the default,
3190 // then we set the timer resolution down to 1 millisecond for
3191 // the duration of their interval.
3192 // We carefully set the resolution back, since otherwise we
3193 // seem to incur an overhead (3%?) that we don't need.
3194 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3195 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3196 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3197 // timeBeginPeriod() if the relative error exceeded some threshold.
3198 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3199 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3200 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3201 // resolution timers running.
3202 private:
3203 jlong resolution;
3204 public:
3205 HighResolutionInterval(jlong ms) {
3206 resolution = ms % 10L;
3207 if (resolution != 0) {
3208 MMRESULT result = timeBeginPeriod(1L);
3209 }
3210 }
3211 ~HighResolutionInterval() {
3212 if (resolution != 0) {
3213 MMRESULT result = timeEndPeriod(1L);
3214 }
3215 resolution = 0L;
3216 }
3217 };
3219 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3220 jlong limit = (jlong) MAXDWORD;
3222 while(ms > limit) {
3223 int res;
3224 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3225 return res;
3226 ms -= limit;
3227 }
3229 assert(thread == Thread::current(), "thread consistency check");
3230 OSThread* osthread = thread->osthread();
3231 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3232 int result;
3233 if (interruptable) {
3234 assert(thread->is_Java_thread(), "must be java thread");
3235 JavaThread *jt = (JavaThread *) thread;
3236 ThreadBlockInVM tbivm(jt);
3238 jt->set_suspend_equivalent();
3239 // cleared by handle_special_suspend_equivalent_condition() or
3240 // java_suspend_self() via check_and_wait_while_suspended()
3242 HANDLE events[1];
3243 events[0] = osthread->interrupt_event();
3244 HighResolutionInterval *phri=NULL;
3245 if(!ForceTimeHighResolution)
3246 phri = new HighResolutionInterval( ms );
3247 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3248 result = OS_TIMEOUT;
3249 } else {
3250 ResetEvent(osthread->interrupt_event());
3251 osthread->set_interrupted(false);
3252 result = OS_INTRPT;
3253 }
3254 delete phri; //if it is NULL, harmless
3256 // were we externally suspended while we were waiting?
3257 jt->check_and_wait_while_suspended();
3258 } else {
3259 assert(!thread->is_Java_thread(), "must not be java thread");
3260 Sleep((long) ms);
3261 result = OS_TIMEOUT;
3262 }
3263 return result;
3264 }
3266 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3267 void os::infinite_sleep() {
3268 while (true) { // sleep forever ...
3269 Sleep(100000); // ... 100 seconds at a time
3270 }
3271 }
3273 typedef BOOL (WINAPI * STTSignature)(void) ;
3275 os::YieldResult os::NakedYield() {
3276 // Use either SwitchToThread() or Sleep(0)
3277 // Consider passing back the return value from SwitchToThread().
3278 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3279 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3280 } else {
3281 Sleep(0);
3282 }
3283 return os::YIELD_UNKNOWN ;
3284 }
3286 void os::yield() { os::NakedYield(); }
3288 void os::yield_all(int attempts) {
3289 // Yields to all threads, including threads with lower priorities
3290 Sleep(1);
3291 }
3293 // Win32 only gives you access to seven real priorities at a time,
3294 // so we compress Java's ten down to seven. It would be better
3295 // if we dynamically adjusted relative priorities.
3297 int os::java_to_os_priority[MaxPriority + 1] = {
3298 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3299 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3300 THREAD_PRIORITY_LOWEST, // 2
3301 THREAD_PRIORITY_BELOW_NORMAL, // 3
3302 THREAD_PRIORITY_BELOW_NORMAL, // 4
3303 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3304 THREAD_PRIORITY_NORMAL, // 6
3305 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3306 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3307 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3308 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3309 };
3311 int prio_policy1[MaxPriority + 1] = {
3312 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3313 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3314 THREAD_PRIORITY_LOWEST, // 2
3315 THREAD_PRIORITY_BELOW_NORMAL, // 3
3316 THREAD_PRIORITY_BELOW_NORMAL, // 4
3317 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3318 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3319 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3320 THREAD_PRIORITY_HIGHEST, // 8
3321 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3322 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3323 };
3325 static int prio_init() {
3326 // If ThreadPriorityPolicy is 1, switch tables
3327 if (ThreadPriorityPolicy == 1) {
3328 int i;
3329 for (i = 0; i < MaxPriority + 1; i++) {
3330 os::java_to_os_priority[i] = prio_policy1[i];
3331 }
3332 }
3333 return 0;
3334 }
3336 OSReturn os::set_native_priority(Thread* thread, int priority) {
3337 if (!UseThreadPriorities) return OS_OK;
3338 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3339 return ret ? OS_OK : OS_ERR;
3340 }
3342 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3343 if ( !UseThreadPriorities ) {
3344 *priority_ptr = java_to_os_priority[NormPriority];
3345 return OS_OK;
3346 }
3347 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3348 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3349 assert(false, "GetThreadPriority failed");
3350 return OS_ERR;
3351 }
3352 *priority_ptr = os_prio;
3353 return OS_OK;
3354 }
3357 // Hint to the underlying OS that a task switch would not be good.
3358 // Void return because it's a hint and can fail.
3359 void os::hint_no_preempt() {}
3361 void os::interrupt(Thread* thread) {
3362 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3363 "possibility of dangling Thread pointer");
3365 OSThread* osthread = thread->osthread();
3366 osthread->set_interrupted(true);
3367 // More than one thread can get here with the same value of osthread,
3368 // resulting in multiple notifications. We do, however, want the store
3369 // to interrupted() to be visible to other threads before we post
3370 // the interrupt event.
3371 OrderAccess::release();
3372 SetEvent(osthread->interrupt_event());
3373 // For JSR166: unpark after setting status
3374 if (thread->is_Java_thread())
3375 ((JavaThread*)thread)->parker()->unpark();
3377 ParkEvent * ev = thread->_ParkEvent ;
3378 if (ev != NULL) ev->unpark() ;
3380 }
3383 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3384 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3385 "possibility of dangling Thread pointer");
3387 OSThread* osthread = thread->osthread();
3388 bool interrupted = osthread->interrupted();
3389 // There is no synchronization between the setting of the interrupt
3390 // and it being cleared here. It is critical - see 6535709 - that
3391 // we only clear the interrupt state, and reset the interrupt event,
3392 // if we are going to report that we were indeed interrupted - else
3393 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3394 // depending on the timing
3395 if (interrupted && clear_interrupted) {
3396 osthread->set_interrupted(false);
3397 ResetEvent(osthread->interrupt_event());
3398 } // Otherwise leave the interrupted state alone
3400 return interrupted;
3401 }
3403 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3404 ExtendedPC os::get_thread_pc(Thread* thread) {
3405 CONTEXT context;
3406 context.ContextFlags = CONTEXT_CONTROL;
3407 HANDLE handle = thread->osthread()->thread_handle();
3408 #ifdef _M_IA64
3409 assert(0, "Fix get_thread_pc");
3410 return ExtendedPC(NULL);
3411 #else
3412 if (GetThreadContext(handle, &context)) {
3413 #ifdef _M_AMD64
3414 return ExtendedPC((address) context.Rip);
3415 #else
3416 return ExtendedPC((address) context.Eip);
3417 #endif
3418 } else {
3419 return ExtendedPC(NULL);
3420 }
3421 #endif
3422 }
3424 // GetCurrentThreadId() returns DWORD
3425 intx os::current_thread_id() { return GetCurrentThreadId(); }
3427 static int _initial_pid = 0;
3429 int os::current_process_id()
3430 {
3431 return (_initial_pid ? _initial_pid : _getpid());
3432 }
3434 int os::win32::_vm_page_size = 0;
3435 int os::win32::_vm_allocation_granularity = 0;
3436 int os::win32::_processor_type = 0;
3437 // Processor level is not available on non-NT systems, use vm_version instead
3438 int os::win32::_processor_level = 0;
3439 julong os::win32::_physical_memory = 0;
3440 size_t os::win32::_default_stack_size = 0;
3442 intx os::win32::_os_thread_limit = 0;
3443 volatile intx os::win32::_os_thread_count = 0;
3445 bool os::win32::_is_nt = false;
3446 bool os::win32::_is_windows_2003 = false;
3447 bool os::win32::_is_windows_server = false;
3449 void os::win32::initialize_system_info() {
3450 SYSTEM_INFO si;
3451 GetSystemInfo(&si);
3452 _vm_page_size = si.dwPageSize;
3453 _vm_allocation_granularity = si.dwAllocationGranularity;
3454 _processor_type = si.dwProcessorType;
3455 _processor_level = si.wProcessorLevel;
3456 set_processor_count(si.dwNumberOfProcessors);
3458 MEMORYSTATUSEX ms;
3459 ms.dwLength = sizeof(ms);
3461 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3462 // dwMemoryLoad (% of memory in use)
3463 GlobalMemoryStatusEx(&ms);
3464 _physical_memory = ms.ullTotalPhys;
3466 OSVERSIONINFOEX oi;
3467 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3468 GetVersionEx((OSVERSIONINFO*)&oi);
3469 switch(oi.dwPlatformId) {
3470 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3471 case VER_PLATFORM_WIN32_NT:
3472 _is_nt = true;
3473 {
3474 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3475 if (os_vers == 5002) {
3476 _is_windows_2003 = true;
3477 }
3478 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3479 oi.wProductType == VER_NT_SERVER) {
3480 _is_windows_server = true;
3481 }
3482 }
3483 break;
3484 default: fatal("Unknown platform");
3485 }
3487 _default_stack_size = os::current_stack_size();
3488 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3489 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3490 "stack size not a multiple of page size");
3492 initialize_performance_counter();
3494 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3495 // known to deadlock the system, if the VM issues to thread operations with
3496 // a too high frequency, e.g., such as changing the priorities.
3497 // The 6000 seems to work well - no deadlocks has been notices on the test
3498 // programs that we have seen experience this problem.
3499 if (!os::win32::is_nt()) {
3500 StarvationMonitorInterval = 6000;
3501 }
3502 }
3505 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3506 char path[MAX_PATH];
3507 DWORD size;
3508 DWORD pathLen = (DWORD)sizeof(path);
3509 HINSTANCE result = NULL;
3511 // only allow library name without path component
3512 assert(strchr(name, '\\') == NULL, "path not allowed");
3513 assert(strchr(name, ':') == NULL, "path not allowed");
3514 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3515 jio_snprintf(ebuf, ebuflen,
3516 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3517 return NULL;
3518 }
3520 // search system directory
3521 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3522 strcat(path, "\\");
3523 strcat(path, name);
3524 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3525 return result;
3526 }
3527 }
3529 // try Windows directory
3530 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3531 strcat(path, "\\");
3532 strcat(path, name);
3533 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3534 return result;
3535 }
3536 }
3538 jio_snprintf(ebuf, ebuflen,
3539 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3540 return NULL;
3541 }
3543 void os::win32::setmode_streams() {
3544 _setmode(_fileno(stdin), _O_BINARY);
3545 _setmode(_fileno(stdout), _O_BINARY);
3546 _setmode(_fileno(stderr), _O_BINARY);
3547 }
3550 bool os::is_debugger_attached() {
3551 return IsDebuggerPresent() ? true : false;
3552 }
3555 void os::wait_for_keypress_at_exit(void) {
3556 if (PauseAtExit) {
3557 fprintf(stderr, "Press any key to continue...\n");
3558 fgetc(stdin);
3559 }
3560 }
3563 int os::message_box(const char* title, const char* message) {
3564 int result = MessageBox(NULL, message, title,
3565 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3566 return result == IDYES;
3567 }
3569 int os::allocate_thread_local_storage() {
3570 return TlsAlloc();
3571 }
3574 void os::free_thread_local_storage(int index) {
3575 TlsFree(index);
3576 }
3579 void os::thread_local_storage_at_put(int index, void* value) {
3580 TlsSetValue(index, value);
3581 assert(thread_local_storage_at(index) == value, "Just checking");
3582 }
3585 void* os::thread_local_storage_at(int index) {
3586 return TlsGetValue(index);
3587 }
3590 #ifndef PRODUCT
3591 #ifndef _WIN64
3592 // Helpers to check whether NX protection is enabled
3593 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3594 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3595 pex->ExceptionRecord->NumberParameters > 0 &&
3596 pex->ExceptionRecord->ExceptionInformation[0] ==
3597 EXCEPTION_INFO_EXEC_VIOLATION) {
3598 return EXCEPTION_EXECUTE_HANDLER;
3599 }
3600 return EXCEPTION_CONTINUE_SEARCH;
3601 }
3603 void nx_check_protection() {
3604 // If NX is enabled we'll get an exception calling into code on the stack
3605 char code[] = { (char)0xC3 }; // ret
3606 void *code_ptr = (void *)code;
3607 __try {
3608 __asm call code_ptr
3609 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3610 tty->print_raw_cr("NX protection detected.");
3611 }
3612 }
3613 #endif // _WIN64
3614 #endif // PRODUCT
3616 // this is called _before_ the global arguments have been parsed
3617 void os::init(void) {
3618 _initial_pid = _getpid();
3620 init_random(1234567);
3622 win32::initialize_system_info();
3623 win32::setmode_streams();
3624 init_page_sizes((size_t) win32::vm_page_size());
3626 // For better scalability on MP systems (must be called after initialize_system_info)
3627 #ifndef PRODUCT
3628 if (is_MP()) {
3629 NoYieldsInMicrolock = true;
3630 }
3631 #endif
3632 // This may be overridden later when argument processing is done.
3633 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3634 os::win32::is_windows_2003());
3636 // Initialize main_process and main_thread
3637 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3638 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3639 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3640 fatal("DuplicateHandle failed\n");
3641 }
3642 main_thread_id = (int) GetCurrentThreadId();
3643 }
3645 // To install functions for atexit processing
3646 extern "C" {
3647 static void perfMemory_exit_helper() {
3648 perfMemory_exit();
3649 }
3650 }
3652 // this is called _after_ the global arguments have been parsed
3653 jint os::init_2(void) {
3654 // Allocate a single page and mark it as readable for safepoint polling
3655 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3656 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3658 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3659 guarantee( return_page != NULL, "Commit Failed for polling page");
3661 os::set_polling_page( polling_page );
3663 #ifndef PRODUCT
3664 if( Verbose && PrintMiscellaneous )
3665 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3666 #endif
3668 if (!UseMembar) {
3669 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3670 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3672 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3673 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3675 os::set_memory_serialize_page( mem_serialize_page );
3677 #ifndef PRODUCT
3678 if(Verbose && PrintMiscellaneous)
3679 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3680 #endif
3681 }
3683 os::large_page_init();
3685 // Setup Windows Exceptions
3687 // On Itanium systems, Structured Exception Handling does not
3688 // work since stack frames must be walkable by the OS. Since
3689 // much of our code is dynamically generated, and we do not have
3690 // proper unwind .xdata sections, the system simply exits
3691 // rather than delivering the exception. To work around
3692 // this we use VectorExceptions instead.
3693 #ifdef _WIN64
3694 if (UseVectoredExceptions) {
3695 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3696 }
3697 #endif
3699 // for debugging float code generation bugs
3700 if (ForceFloatExceptions) {
3701 #ifndef _WIN64
3702 static long fp_control_word = 0;
3703 __asm { fstcw fp_control_word }
3704 // see Intel PPro Manual, Vol. 2, p 7-16
3705 const long precision = 0x20;
3706 const long underflow = 0x10;
3707 const long overflow = 0x08;
3708 const long zero_div = 0x04;
3709 const long denorm = 0x02;
3710 const long invalid = 0x01;
3711 fp_control_word |= invalid;
3712 __asm { fldcw fp_control_word }
3713 #endif
3714 }
3716 // If stack_commit_size is 0, windows will reserve the default size,
3717 // but only commit a small portion of it.
3718 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3719 size_t default_reserve_size = os::win32::default_stack_size();
3720 size_t actual_reserve_size = stack_commit_size;
3721 if (stack_commit_size < default_reserve_size) {
3722 // If stack_commit_size == 0, we want this too
3723 actual_reserve_size = default_reserve_size;
3724 }
3726 // Check minimum allowable stack size for thread creation and to initialize
3727 // the java system classes, including StackOverflowError - depends on page
3728 // size. Add a page for compiler2 recursion in main thread.
3729 // Add in 2*BytesPerWord times page size to account for VM stack during
3730 // class initialization depending on 32 or 64 bit VM.
3731 size_t min_stack_allowed =
3732 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3733 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3734 if (actual_reserve_size < min_stack_allowed) {
3735 tty->print_cr("\nThe stack size specified is too small, "
3736 "Specify at least %dk",
3737 min_stack_allowed / K);
3738 return JNI_ERR;
3739 }
3741 JavaThread::set_stack_size_at_create(stack_commit_size);
3743 // Calculate theoretical max. size of Threads to guard gainst artifical
3744 // out-of-memory situations, where all available address-space has been
3745 // reserved by thread stacks.
3746 assert(actual_reserve_size != 0, "Must have a stack");
3748 // Calculate the thread limit when we should start doing Virtual Memory
3749 // banging. Currently when the threads will have used all but 200Mb of space.
3750 //
3751 // TODO: consider performing a similar calculation for commit size instead
3752 // as reserve size, since on a 64-bit platform we'll run into that more
3753 // often than running out of virtual memory space. We can use the
3754 // lower value of the two calculations as the os_thread_limit.
3755 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3756 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3758 // at exit methods are called in the reverse order of their registration.
3759 // there is no limit to the number of functions registered. atexit does
3760 // not set errno.
3762 if (PerfAllowAtExitRegistration) {
3763 // only register atexit functions if PerfAllowAtExitRegistration is set.
3764 // atexit functions can be delayed until process exit time, which
3765 // can be problematic for embedded VM situations. Embedded VMs should
3766 // call DestroyJavaVM() to assure that VM resources are released.
3768 // note: perfMemory_exit_helper atexit function may be removed in
3769 // the future if the appropriate cleanup code can be added to the
3770 // VM_Exit VMOperation's doit method.
3771 if (atexit(perfMemory_exit_helper) != 0) {
3772 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3773 }
3774 }
3776 #ifndef _WIN64
3777 // Print something if NX is enabled (win32 on AMD64)
3778 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3779 #endif
3781 // initialize thread priority policy
3782 prio_init();
3784 if (UseNUMA && !ForceNUMA) {
3785 UseNUMA = false; // We don't fully support this yet
3786 }
3788 if (UseNUMAInterleaving) {
3789 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3790 bool success = numa_interleaving_init();
3791 if (!success) UseNUMAInterleaving = false;
3792 }
3794 return JNI_OK;
3795 }
3797 void os::init_3(void) {
3798 return;
3799 }
3801 // Mark the polling page as unreadable
3802 void os::make_polling_page_unreadable(void) {
3803 DWORD old_status;
3804 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3805 fatal("Could not disable polling page");
3806 };
3808 // Mark the polling page as readable
3809 void os::make_polling_page_readable(void) {
3810 DWORD old_status;
3811 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3812 fatal("Could not enable polling page");
3813 };
3816 int os::stat(const char *path, struct stat *sbuf) {
3817 char pathbuf[MAX_PATH];
3818 if (strlen(path) > MAX_PATH - 1) {
3819 errno = ENAMETOOLONG;
3820 return -1;
3821 }
3822 os::native_path(strcpy(pathbuf, path));
3823 int ret = ::stat(pathbuf, sbuf);
3824 if (sbuf != NULL && UseUTCFileTimestamp) {
3825 // Fix for 6539723. st_mtime returned from stat() is dependent on
3826 // the system timezone and so can return different values for the
3827 // same file if/when daylight savings time changes. This adjustment
3828 // makes sure the same timestamp is returned regardless of the TZ.
3829 //
3830 // See:
3831 // http://msdn.microsoft.com/library/
3832 // default.asp?url=/library/en-us/sysinfo/base/
3833 // time_zone_information_str.asp
3834 // and
3835 // http://msdn.microsoft.com/library/default.asp?url=
3836 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3837 //
3838 // NOTE: there is a insidious bug here: If the timezone is changed
3839 // after the call to stat() but before 'GetTimeZoneInformation()', then
3840 // the adjustment we do here will be wrong and we'll return the wrong
3841 // value (which will likely end up creating an invalid class data
3842 // archive). Absent a better API for this, or some time zone locking
3843 // mechanism, we'll have to live with this risk.
3844 TIME_ZONE_INFORMATION tz;
3845 DWORD tzid = GetTimeZoneInformation(&tz);
3846 int daylightBias =
3847 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3848 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3849 }
3850 return ret;
3851 }
3854 #define FT2INT64(ft) \
3855 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3858 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3859 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3860 // of a thread.
3861 //
3862 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3863 // the fast estimate available on the platform.
3865 // current_thread_cpu_time() is not optimized for Windows yet
3866 jlong os::current_thread_cpu_time() {
3867 // return user + sys since the cost is the same
3868 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3869 }
3871 jlong os::thread_cpu_time(Thread* thread) {
3872 // consistent with what current_thread_cpu_time() returns.
3873 return os::thread_cpu_time(thread, true /* user+sys */);
3874 }
3876 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3877 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3878 }
3880 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3881 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3882 // If this function changes, os::is_thread_cpu_time_supported() should too
3883 if (os::win32::is_nt()) {
3884 FILETIME CreationTime;
3885 FILETIME ExitTime;
3886 FILETIME KernelTime;
3887 FILETIME UserTime;
3889 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3890 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3891 return -1;
3892 else
3893 if (user_sys_cpu_time) {
3894 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3895 } else {
3896 return FT2INT64(UserTime) * 100;
3897 }
3898 } else {
3899 return (jlong) timeGetTime() * 1000000;
3900 }
3901 }
3903 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3904 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3905 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3906 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3907 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3908 }
3910 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3911 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3912 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3913 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3914 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3915 }
3917 bool os::is_thread_cpu_time_supported() {
3918 // see os::thread_cpu_time
3919 if (os::win32::is_nt()) {
3920 FILETIME CreationTime;
3921 FILETIME ExitTime;
3922 FILETIME KernelTime;
3923 FILETIME UserTime;
3925 if ( GetThreadTimes(GetCurrentThread(),
3926 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3927 return false;
3928 else
3929 return true;
3930 } else {
3931 return false;
3932 }
3933 }
3935 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3936 // It does have primitives (PDH API) to get CPU usage and run queue length.
3937 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3938 // If we wanted to implement loadavg on Windows, we have a few options:
3939 //
3940 // a) Query CPU usage and run queue length and "fake" an answer by
3941 // returning the CPU usage if it's under 100%, and the run queue
3942 // length otherwise. It turns out that querying is pretty slow
3943 // on Windows, on the order of 200 microseconds on a fast machine.
3944 // Note that on the Windows the CPU usage value is the % usage
3945 // since the last time the API was called (and the first call
3946 // returns 100%), so we'd have to deal with that as well.
3947 //
3948 // b) Sample the "fake" answer using a sampling thread and store
3949 // the answer in a global variable. The call to loadavg would
3950 // just return the value of the global, avoiding the slow query.
3951 //
3952 // c) Sample a better answer using exponential decay to smooth the
3953 // value. This is basically the algorithm used by UNIX kernels.
3954 //
3955 // Note that sampling thread starvation could affect both (b) and (c).
3956 int os::loadavg(double loadavg[], int nelem) {
3957 return -1;
3958 }
3961 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3962 bool os::dont_yield() {
3963 return DontYieldALot;
3964 }
3966 // This method is a slightly reworked copy of JDK's sysOpen
3967 // from src/windows/hpi/src/sys_api_md.c
3969 int os::open(const char *path, int oflag, int mode) {
3970 char pathbuf[MAX_PATH];
3972 if (strlen(path) > MAX_PATH - 1) {
3973 errno = ENAMETOOLONG;
3974 return -1;
3975 }
3976 os::native_path(strcpy(pathbuf, path));
3977 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
3978 }
3980 // Is a (classpath) directory empty?
3981 bool os::dir_is_empty(const char* path) {
3982 WIN32_FIND_DATA fd;
3983 HANDLE f = FindFirstFile(path, &fd);
3984 if (f == INVALID_HANDLE_VALUE) {
3985 return true;
3986 }
3987 FindClose(f);
3988 return false;
3989 }
3991 // create binary file, rewriting existing file if required
3992 int os::create_binary_file(const char* path, bool rewrite_existing) {
3993 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3994 if (!rewrite_existing) {
3995 oflags |= _O_EXCL;
3996 }
3997 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3998 }
4000 // return current position of file pointer
4001 jlong os::current_file_offset(int fd) {
4002 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4003 }
4005 // move file pointer to the specified offset
4006 jlong os::seek_to_file_offset(int fd, jlong offset) {
4007 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4008 }
4011 jlong os::lseek(int fd, jlong offset, int whence) {
4012 return (jlong) ::_lseeki64(fd, offset, whence);
4013 }
4015 // This method is a slightly reworked copy of JDK's sysNativePath
4016 // from src/windows/hpi/src/path_md.c
4018 /* Convert a pathname to native format. On win32, this involves forcing all
4019 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4020 sometimes rejects '/') and removing redundant separators. The input path is
4021 assumed to have been converted into the character encoding used by the local
4022 system. Because this might be a double-byte encoding, care is taken to
4023 treat double-byte lead characters correctly.
4025 This procedure modifies the given path in place, as the result is never
4026 longer than the original. There is no error return; this operation always
4027 succeeds. */
4028 char * os::native_path(char *path) {
4029 char *src = path, *dst = path, *end = path;
4030 char *colon = NULL; /* If a drive specifier is found, this will
4031 point to the colon following the drive
4032 letter */
4034 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4035 assert(((!::IsDBCSLeadByte('/'))
4036 && (!::IsDBCSLeadByte('\\'))
4037 && (!::IsDBCSLeadByte(':'))),
4038 "Illegal lead byte");
4040 /* Check for leading separators */
4041 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4042 while (isfilesep(*src)) {
4043 src++;
4044 }
4046 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4047 /* Remove leading separators if followed by drive specifier. This
4048 hack is necessary to support file URLs containing drive
4049 specifiers (e.g., "file://c:/path"). As a side effect,
4050 "/c:/path" can be used as an alternative to "c:/path". */
4051 *dst++ = *src++;
4052 colon = dst;
4053 *dst++ = ':';
4054 src++;
4055 } else {
4056 src = path;
4057 if (isfilesep(src[0]) && isfilesep(src[1])) {
4058 /* UNC pathname: Retain first separator; leave src pointed at
4059 second separator so that further separators will be collapsed
4060 into the second separator. The result will be a pathname
4061 beginning with "\\\\" followed (most likely) by a host name. */
4062 src = dst = path + 1;
4063 path[0] = '\\'; /* Force first separator to '\\' */
4064 }
4065 }
4067 end = dst;
4069 /* Remove redundant separators from remainder of path, forcing all
4070 separators to be '\\' rather than '/'. Also, single byte space
4071 characters are removed from the end of the path because those
4072 are not legal ending characters on this operating system.
4073 */
4074 while (*src != '\0') {
4075 if (isfilesep(*src)) {
4076 *dst++ = '\\'; src++;
4077 while (isfilesep(*src)) src++;
4078 if (*src == '\0') {
4079 /* Check for trailing separator */
4080 end = dst;
4081 if (colon == dst - 2) break; /* "z:\\" */
4082 if (dst == path + 1) break; /* "\\" */
4083 if (dst == path + 2 && isfilesep(path[0])) {
4084 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4085 beginning of a UNC pathname. Even though it is not, by
4086 itself, a valid UNC pathname, we leave it as is in order
4087 to be consistent with the path canonicalizer as well
4088 as the win32 APIs, which treat this case as an invalid
4089 UNC pathname rather than as an alias for the root
4090 directory of the current drive. */
4091 break;
4092 }
4093 end = --dst; /* Path does not denote a root directory, so
4094 remove trailing separator */
4095 break;
4096 }
4097 end = dst;
4098 } else {
4099 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4100 *dst++ = *src++;
4101 if (*src) *dst++ = *src++;
4102 end = dst;
4103 } else { /* Copy a single-byte character */
4104 char c = *src++;
4105 *dst++ = c;
4106 /* Space is not a legal ending character */
4107 if (c != ' ') end = dst;
4108 }
4109 }
4110 }
4112 *end = '\0';
4114 /* For "z:", add "." to work around a bug in the C runtime library */
4115 if (colon == dst - 1) {
4116 path[2] = '.';
4117 path[3] = '\0';
4118 }
4120 #ifdef DEBUG
4121 jio_fprintf(stderr, "sysNativePath: %s\n", path);
4122 #endif DEBUG
4123 return path;
4124 }
4126 // This code is a copy of JDK's sysSetLength
4127 // from src/windows/hpi/src/sys_api_md.c
4129 int os::ftruncate(int fd, jlong length) {
4130 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4131 long high = (long)(length >> 32);
4132 DWORD ret;
4134 if (h == (HANDLE)(-1)) {
4135 return -1;
4136 }
4138 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4139 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4140 return -1;
4141 }
4143 if (::SetEndOfFile(h) == FALSE) {
4144 return -1;
4145 }
4147 return 0;
4148 }
4151 // This code is a copy of JDK's sysSync
4152 // from src/windows/hpi/src/sys_api_md.c
4153 // except for the legacy workaround for a bug in Win 98
4155 int os::fsync(int fd) {
4156 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4158 if ( (!::FlushFileBuffers(handle)) &&
4159 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4160 /* from winerror.h */
4161 return -1;
4162 }
4163 return 0;
4164 }
4166 static int nonSeekAvailable(int, long *);
4167 static int stdinAvailable(int, long *);
4169 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4170 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4172 // This code is a copy of JDK's sysAvailable
4173 // from src/windows/hpi/src/sys_api_md.c
4175 int os::available(int fd, jlong *bytes) {
4176 jlong cur, end;
4177 struct _stati64 stbuf64;
4179 if (::_fstati64(fd, &stbuf64) >= 0) {
4180 int mode = stbuf64.st_mode;
4181 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4182 int ret;
4183 long lpbytes;
4184 if (fd == 0) {
4185 ret = stdinAvailable(fd, &lpbytes);
4186 } else {
4187 ret = nonSeekAvailable(fd, &lpbytes);
4188 }
4189 (*bytes) = (jlong)(lpbytes);
4190 return ret;
4191 }
4192 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4193 return FALSE;
4194 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4195 return FALSE;
4196 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4197 return FALSE;
4198 }
4199 *bytes = end - cur;
4200 return TRUE;
4201 } else {
4202 return FALSE;
4203 }
4204 }
4206 // This code is a copy of JDK's nonSeekAvailable
4207 // from src/windows/hpi/src/sys_api_md.c
4209 static int nonSeekAvailable(int fd, long *pbytes) {
4210 /* This is used for available on non-seekable devices
4211 * (like both named and anonymous pipes, such as pipes
4212 * connected to an exec'd process).
4213 * Standard Input is a special case.
4214 *
4215 */
4216 HANDLE han;
4218 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4219 return FALSE;
4220 }
4222 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4223 /* PeekNamedPipe fails when at EOF. In that case we
4224 * simply make *pbytes = 0 which is consistent with the
4225 * behavior we get on Solaris when an fd is at EOF.
4226 * The only alternative is to raise an Exception,
4227 * which isn't really warranted.
4228 */
4229 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4230 return FALSE;
4231 }
4232 *pbytes = 0;
4233 }
4234 return TRUE;
4235 }
4237 #define MAX_INPUT_EVENTS 2000
4239 // This code is a copy of JDK's stdinAvailable
4240 // from src/windows/hpi/src/sys_api_md.c
4242 static int stdinAvailable(int fd, long *pbytes) {
4243 HANDLE han;
4244 DWORD numEventsRead = 0; /* Number of events read from buffer */
4245 DWORD numEvents = 0; /* Number of events in buffer */
4246 DWORD i = 0; /* Loop index */
4247 DWORD curLength = 0; /* Position marker */
4248 DWORD actualLength = 0; /* Number of bytes readable */
4249 BOOL error = FALSE; /* Error holder */
4250 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4252 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4253 return FALSE;
4254 }
4256 /* Construct an array of input records in the console buffer */
4257 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4258 if (error == 0) {
4259 return nonSeekAvailable(fd, pbytes);
4260 }
4262 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4263 if (numEvents > MAX_INPUT_EVENTS) {
4264 numEvents = MAX_INPUT_EVENTS;
4265 }
4267 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD));
4268 if (lpBuffer == NULL) {
4269 return FALSE;
4270 }
4272 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4273 if (error == 0) {
4274 os::free(lpBuffer);
4275 return FALSE;
4276 }
4278 /* Examine input records for the number of bytes available */
4279 for(i=0; i<numEvents; i++) {
4280 if (lpBuffer[i].EventType == KEY_EVENT) {
4282 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4283 &(lpBuffer[i].Event);
4284 if (keyRecord->bKeyDown == TRUE) {
4285 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4286 curLength++;
4287 if (*keyPressed == '\r') {
4288 actualLength = curLength;
4289 }
4290 }
4291 }
4292 }
4294 if(lpBuffer != NULL) {
4295 os::free(lpBuffer);
4296 }
4298 *pbytes = (long) actualLength;
4299 return TRUE;
4300 }
4302 // Map a block of memory.
4303 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
4304 char *addr, size_t bytes, bool read_only,
4305 bool allow_exec) {
4306 HANDLE hFile;
4307 char* base;
4309 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4310 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4311 if (hFile == NULL) {
4312 if (PrintMiscellaneous && Verbose) {
4313 DWORD err = GetLastError();
4314 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4315 }
4316 return NULL;
4317 }
4319 if (allow_exec) {
4320 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4321 // unless it comes from a PE image (which the shared archive is not.)
4322 // Even VirtualProtect refuses to give execute access to mapped memory
4323 // that was not previously executable.
4324 //
4325 // Instead, stick the executable region in anonymous memory. Yuck.
4326 // Penalty is that ~4 pages will not be shareable - in the future
4327 // we might consider DLLizing the shared archive with a proper PE
4328 // header so that mapping executable + sharing is possible.
4330 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4331 PAGE_READWRITE);
4332 if (base == NULL) {
4333 if (PrintMiscellaneous && Verbose) {
4334 DWORD err = GetLastError();
4335 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4336 }
4337 CloseHandle(hFile);
4338 return NULL;
4339 }
4341 DWORD bytes_read;
4342 OVERLAPPED overlapped;
4343 overlapped.Offset = (DWORD)file_offset;
4344 overlapped.OffsetHigh = 0;
4345 overlapped.hEvent = NULL;
4346 // ReadFile guarantees that if the return value is true, the requested
4347 // number of bytes were read before returning.
4348 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4349 if (!res) {
4350 if (PrintMiscellaneous && Verbose) {
4351 DWORD err = GetLastError();
4352 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4353 }
4354 release_memory(base, bytes);
4355 CloseHandle(hFile);
4356 return NULL;
4357 }
4358 } else {
4359 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4360 NULL /*file_name*/);
4361 if (hMap == NULL) {
4362 if (PrintMiscellaneous && Verbose) {
4363 DWORD err = GetLastError();
4364 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4365 }
4366 CloseHandle(hFile);
4367 return NULL;
4368 }
4370 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4371 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4372 (DWORD)bytes, addr);
4373 if (base == NULL) {
4374 if (PrintMiscellaneous && Verbose) {
4375 DWORD err = GetLastError();
4376 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4377 }
4378 CloseHandle(hMap);
4379 CloseHandle(hFile);
4380 return NULL;
4381 }
4383 if (CloseHandle(hMap) == 0) {
4384 if (PrintMiscellaneous && Verbose) {
4385 DWORD err = GetLastError();
4386 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4387 }
4388 CloseHandle(hFile);
4389 return base;
4390 }
4391 }
4393 if (allow_exec) {
4394 DWORD old_protect;
4395 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4396 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4398 if (!res) {
4399 if (PrintMiscellaneous && Verbose) {
4400 DWORD err = GetLastError();
4401 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4402 }
4403 // Don't consider this a hard error, on IA32 even if the
4404 // VirtualProtect fails, we should still be able to execute
4405 CloseHandle(hFile);
4406 return base;
4407 }
4408 }
4410 if (CloseHandle(hFile) == 0) {
4411 if (PrintMiscellaneous && Verbose) {
4412 DWORD err = GetLastError();
4413 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4414 }
4415 return base;
4416 }
4418 return base;
4419 }
4422 // Remap a block of memory.
4423 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
4424 char *addr, size_t bytes, bool read_only,
4425 bool allow_exec) {
4426 // This OS does not allow existing memory maps to be remapped so we
4427 // have to unmap the memory before we remap it.
4428 if (!os::unmap_memory(addr, bytes)) {
4429 return NULL;
4430 }
4432 // There is a very small theoretical window between the unmap_memory()
4433 // call above and the map_memory() call below where a thread in native
4434 // code may be able to access an address that is no longer mapped.
4436 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4437 allow_exec);
4438 }
4441 // Unmap a block of memory.
4442 // Returns true=success, otherwise false.
4444 bool os::unmap_memory(char* addr, size_t bytes) {
4445 BOOL result = UnmapViewOfFile(addr);
4446 if (result == 0) {
4447 if (PrintMiscellaneous && Verbose) {
4448 DWORD err = GetLastError();
4449 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4450 }
4451 return false;
4452 }
4453 return true;
4454 }
4456 void os::pause() {
4457 char filename[MAX_PATH];
4458 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4459 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4460 } else {
4461 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4462 }
4464 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4465 if (fd != -1) {
4466 struct stat buf;
4467 ::close(fd);
4468 while (::stat(filename, &buf) == 0) {
4469 Sleep(100);
4470 }
4471 } else {
4472 jio_fprintf(stderr,
4473 "Could not open pause file '%s', continuing immediately.\n", filename);
4474 }
4475 }
4477 // An Event wraps a win32 "CreateEvent" kernel handle.
4478 //
4479 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4480 //
4481 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4482 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4483 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4484 // In addition, an unpark() operation might fetch the handle field, but the
4485 // event could recycle between the fetch and the SetEvent() operation.
4486 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4487 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4488 // on an stale but recycled handle would be harmless, but in practice this might
4489 // confuse other non-Sun code, so it's not a viable approach.
4490 //
4491 // 2: Once a win32 event handle is associated with an Event, it remains associated
4492 // with the Event. The event handle is never closed. This could be construed
4493 // as handle leakage, but only up to the maximum # of threads that have been extant
4494 // at any one time. This shouldn't be an issue, as windows platforms typically
4495 // permit a process to have hundreds of thousands of open handles.
4496 //
4497 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4498 // and release unused handles.
4499 //
4500 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4501 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4502 //
4503 // 5. Use an RCU-like mechanism (Read-Copy Update).
4504 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4505 //
4506 // We use (2).
4507 //
4508 // TODO-FIXME:
4509 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4510 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4511 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4512 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4513 // into a single win32 CreateEvent() handle.
4514 //
4515 // _Event transitions in park()
4516 // -1 => -1 : illegal
4517 // 1 => 0 : pass - return immediately
4518 // 0 => -1 : block
4519 //
4520 // _Event serves as a restricted-range semaphore :
4521 // -1 : thread is blocked
4522 // 0 : neutral - thread is running or ready
4523 // 1 : signaled - thread is running or ready
4524 //
4525 // Another possible encoding of _Event would be
4526 // with explicit "PARKED" and "SIGNALED" bits.
4528 int os::PlatformEvent::park (jlong Millis) {
4529 guarantee (_ParkHandle != NULL , "Invariant") ;
4530 guarantee (Millis > 0 , "Invariant") ;
4531 int v ;
4533 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4534 // the initial park() operation.
4536 for (;;) {
4537 v = _Event ;
4538 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4539 }
4540 guarantee ((v == 0) || (v == 1), "invariant") ;
4541 if (v != 0) return OS_OK ;
4543 // Do this the hard way by blocking ...
4544 // TODO: consider a brief spin here, gated on the success of recent
4545 // spin attempts by this thread.
4546 //
4547 // We decompose long timeouts into series of shorter timed waits.
4548 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4549 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4550 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4551 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4552 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4553 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4554 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4555 // for the already waited time. This policy does not admit any new outcomes.
4556 // In the future, however, we might want to track the accumulated wait time and
4557 // adjust Millis accordingly if we encounter a spurious wakeup.
4559 const int MAXTIMEOUT = 0x10000000 ;
4560 DWORD rv = WAIT_TIMEOUT ;
4561 while (_Event < 0 && Millis > 0) {
4562 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4563 if (Millis > MAXTIMEOUT) {
4564 prd = MAXTIMEOUT ;
4565 }
4566 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4567 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4568 if (rv == WAIT_TIMEOUT) {
4569 Millis -= prd ;
4570 }
4571 }
4572 v = _Event ;
4573 _Event = 0 ;
4574 OrderAccess::fence() ;
4575 // If we encounter a nearly simultanous timeout expiry and unpark()
4576 // we return OS_OK indicating we awoke via unpark().
4577 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4578 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4579 }
4581 void os::PlatformEvent::park () {
4582 guarantee (_ParkHandle != NULL, "Invariant") ;
4583 // Invariant: Only the thread associated with the Event/PlatformEvent
4584 // may call park().
4585 int v ;
4586 for (;;) {
4587 v = _Event ;
4588 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4589 }
4590 guarantee ((v == 0) || (v == 1), "invariant") ;
4591 if (v != 0) return ;
4593 // Do this the hard way by blocking ...
4594 // TODO: consider a brief spin here, gated on the success of recent
4595 // spin attempts by this thread.
4596 while (_Event < 0) {
4597 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4598 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4599 }
4601 // Usually we'll find _Event == 0 at this point, but as
4602 // an optional optimization we clear it, just in case can
4603 // multiple unpark() operations drove _Event up to 1.
4604 _Event = 0 ;
4605 OrderAccess::fence() ;
4606 guarantee (_Event >= 0, "invariant") ;
4607 }
4609 void os::PlatformEvent::unpark() {
4610 guarantee (_ParkHandle != NULL, "Invariant") ;
4611 int v ;
4612 for (;;) {
4613 v = _Event ; // Increment _Event if it's < 1.
4614 if (v > 0) {
4615 // If it's already signaled just return.
4616 // The LD of _Event could have reordered or be satisfied
4617 // by a read-aside from this processor's write buffer.
4618 // To avoid problems execute a barrier and then
4619 // ratify the value. A degenerate CAS() would also work.
4620 // Viz., CAS (v+0, &_Event, v) == v).
4621 OrderAccess::fence() ;
4622 if (_Event == v) return ;
4623 continue ;
4624 }
4625 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4626 }
4627 if (v < 0) {
4628 ::SetEvent (_ParkHandle) ;
4629 }
4630 }
4633 // JSR166
4634 // -------------------------------------------------------
4636 /*
4637 * The Windows implementation of Park is very straightforward: Basic
4638 * operations on Win32 Events turn out to have the right semantics to
4639 * use them directly. We opportunistically resuse the event inherited
4640 * from Monitor.
4641 */
4644 void Parker::park(bool isAbsolute, jlong time) {
4645 guarantee (_ParkEvent != NULL, "invariant") ;
4646 // First, demultiplex/decode time arguments
4647 if (time < 0) { // don't wait
4648 return;
4649 }
4650 else if (time == 0 && !isAbsolute) {
4651 time = INFINITE;
4652 }
4653 else if (isAbsolute) {
4654 time -= os::javaTimeMillis(); // convert to relative time
4655 if (time <= 0) // already elapsed
4656 return;
4657 }
4658 else { // relative
4659 time /= 1000000; // Must coarsen from nanos to millis
4660 if (time == 0) // Wait for the minimal time unit if zero
4661 time = 1;
4662 }
4664 JavaThread* thread = (JavaThread*)(Thread::current());
4665 assert(thread->is_Java_thread(), "Must be JavaThread");
4666 JavaThread *jt = (JavaThread *)thread;
4668 // Don't wait if interrupted or already triggered
4669 if (Thread::is_interrupted(thread, false) ||
4670 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4671 ResetEvent(_ParkEvent);
4672 return;
4673 }
4674 else {
4675 ThreadBlockInVM tbivm(jt);
4676 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4677 jt->set_suspend_equivalent();
4679 WaitForSingleObject(_ParkEvent, time);
4680 ResetEvent(_ParkEvent);
4682 // If externally suspended while waiting, re-suspend
4683 if (jt->handle_special_suspend_equivalent_condition()) {
4684 jt->java_suspend_self();
4685 }
4686 }
4687 }
4689 void Parker::unpark() {
4690 guarantee (_ParkEvent != NULL, "invariant") ;
4691 SetEvent(_ParkEvent);
4692 }
4694 // Run the specified command in a separate process. Return its exit value,
4695 // or -1 on failure (e.g. can't create a new process).
4696 int os::fork_and_exec(char* cmd) {
4697 STARTUPINFO si;
4698 PROCESS_INFORMATION pi;
4700 memset(&si, 0, sizeof(si));
4701 si.cb = sizeof(si);
4702 memset(&pi, 0, sizeof(pi));
4703 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4704 cmd, // command line
4705 NULL, // process security attribute
4706 NULL, // thread security attribute
4707 TRUE, // inherits system handles
4708 0, // no creation flags
4709 NULL, // use parent's environment block
4710 NULL, // use parent's starting directory
4711 &si, // (in) startup information
4712 &pi); // (out) process information
4714 if (rslt) {
4715 // Wait until child process exits.
4716 WaitForSingleObject(pi.hProcess, INFINITE);
4718 DWORD exit_code;
4719 GetExitCodeProcess(pi.hProcess, &exit_code);
4721 // Close process and thread handles.
4722 CloseHandle(pi.hProcess);
4723 CloseHandle(pi.hThread);
4725 return (int)exit_code;
4726 } else {
4727 return -1;
4728 }
4729 }
4731 //--------------------------------------------------------------------------------------------------
4732 // Non-product code
4734 static int mallocDebugIntervalCounter = 0;
4735 static int mallocDebugCounter = 0;
4736 bool os::check_heap(bool force) {
4737 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4738 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4739 // Note: HeapValidate executes two hardware breakpoints when it finds something
4740 // wrong; at these points, eax contains the address of the offending block (I think).
4741 // To get to the exlicit error message(s) below, just continue twice.
4742 HANDLE heap = GetProcessHeap();
4743 { HeapLock(heap);
4744 PROCESS_HEAP_ENTRY phe;
4745 phe.lpData = NULL;
4746 while (HeapWalk(heap, &phe) != 0) {
4747 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4748 !HeapValidate(heap, 0, phe.lpData)) {
4749 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4750 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4751 fatal("corrupted C heap");
4752 }
4753 }
4754 DWORD err = GetLastError();
4755 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4756 fatal(err_msg("heap walk aborted with error %d", err));
4757 }
4758 HeapUnlock(heap);
4759 }
4760 mallocDebugIntervalCounter = 0;
4761 }
4762 return true;
4763 }
4766 bool os::find(address addr, outputStream* st) {
4767 // Nothing yet
4768 return false;
4769 }
4771 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4772 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4774 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4775 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4776 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4777 address addr = (address) exceptionRecord->ExceptionInformation[1];
4779 if (os::is_memory_serialize_page(thread, addr))
4780 return EXCEPTION_CONTINUE_EXECUTION;
4781 }
4783 return EXCEPTION_CONTINUE_SEARCH;
4784 }
4786 // We don't build a headless jre for Windows
4787 bool os::is_headless_jre() { return false; }
4790 typedef CRITICAL_SECTION mutex_t;
4791 #define mutexInit(m) InitializeCriticalSection(m)
4792 #define mutexDestroy(m) DeleteCriticalSection(m)
4793 #define mutexLock(m) EnterCriticalSection(m)
4794 #define mutexUnlock(m) LeaveCriticalSection(m)
4796 static bool sock_initialized = FALSE;
4797 static mutex_t sockFnTableMutex;
4799 static void initSock() {
4800 WSADATA wsadata;
4802 if (!os::WinSock2Dll::WinSock2Available()) {
4803 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4804 ::GetLastError());
4805 return;
4806 }
4807 if (sock_initialized == TRUE) return;
4809 ::mutexInit(&sockFnTableMutex);
4810 ::mutexLock(&sockFnTableMutex);
4811 if (os::WinSock2Dll::WSAStartup(MAKEWORD(1,1), &wsadata) != 0) {
4812 jio_fprintf(stderr, "Could not initialize Winsock\n");
4813 }
4814 sock_initialized = TRUE;
4815 ::mutexUnlock(&sockFnTableMutex);
4816 }
4818 struct hostent* os::get_host_by_name(char* name) {
4819 if (!sock_initialized) {
4820 initSock();
4821 }
4822 if (!os::WinSock2Dll::WinSock2Available()) {
4823 return NULL;
4824 }
4825 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4826 }
4829 int os::socket_close(int fd) {
4830 ShouldNotReachHere();
4831 return 0;
4832 }
4834 int os::socket_available(int fd, jint *pbytes) {
4835 ShouldNotReachHere();
4836 return 0;
4837 }
4839 int os::socket(int domain, int type, int protocol) {
4840 ShouldNotReachHere();
4841 return 0;
4842 }
4844 int os::listen(int fd, int count) {
4845 ShouldNotReachHere();
4846 return 0;
4847 }
4849 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4850 ShouldNotReachHere();
4851 return 0;
4852 }
4854 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4855 ShouldNotReachHere();
4856 return 0;
4857 }
4859 int os::sendto(int fd, char* buf, size_t len, uint flags,
4860 struct sockaddr* to, socklen_t tolen) {
4861 ShouldNotReachHere();
4862 return 0;
4863 }
4865 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4866 sockaddr* from, socklen_t* fromlen) {
4867 ShouldNotReachHere();
4868 return 0;
4869 }
4871 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4872 ShouldNotReachHere();
4873 return 0;
4874 }
4876 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4877 ShouldNotReachHere();
4878 return 0;
4879 }
4881 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
4882 ShouldNotReachHere();
4883 return 0;
4884 }
4886 int os::timeout(int fd, long timeout) {
4887 ShouldNotReachHere();
4888 return 0;
4889 }
4891 int os::get_host_name(char* name, int namelen) {
4892 ShouldNotReachHere();
4893 return 0;
4894 }
4896 int os::socket_shutdown(int fd, int howto) {
4897 ShouldNotReachHere();
4898 return 0;
4899 }
4901 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
4902 ShouldNotReachHere();
4903 return 0;
4904 }
4906 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
4907 ShouldNotReachHere();
4908 return 0;
4909 }
4911 int os::get_sock_opt(int fd, int level, int optname,
4912 char* optval, socklen_t* optlen) {
4913 ShouldNotReachHere();
4914 return 0;
4915 }
4917 int os::set_sock_opt(int fd, int level, int optname,
4918 const char* optval, socklen_t optlen) {
4919 ShouldNotReachHere();
4920 return 0;
4921 }
4924 // Kernel32 API
4925 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
4926 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
4927 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
4928 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
4930 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
4931 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
4932 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
4933 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
4934 BOOL os::Kernel32Dll::initialized = FALSE;
4935 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
4936 assert(initialized && _GetLargePageMinimum != NULL,
4937 "GetLargePageMinimumAvailable() not yet called");
4938 return _GetLargePageMinimum();
4939 }
4941 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
4942 if (!initialized) {
4943 initialize();
4944 }
4945 return _GetLargePageMinimum != NULL;
4946 }
4948 BOOL os::Kernel32Dll::NumaCallsAvailable() {
4949 if (!initialized) {
4950 initialize();
4951 }
4952 return _VirtualAllocExNuma != NULL;
4953 }
4955 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
4956 assert(initialized && _VirtualAllocExNuma != NULL,
4957 "NUMACallsAvailable() not yet called");
4959 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
4960 }
4962 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
4963 assert(initialized && _GetNumaHighestNodeNumber != NULL,
4964 "NUMACallsAvailable() not yet called");
4966 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
4967 }
4969 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
4970 assert(initialized && _GetNumaNodeProcessorMask != NULL,
4971 "NUMACallsAvailable() not yet called");
4973 return _GetNumaNodeProcessorMask(node, proc_mask);
4974 }
4977 void os::Kernel32Dll::initializeCommon() {
4978 if (!initialized) {
4979 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
4980 assert(handle != NULL, "Just check");
4981 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
4982 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
4983 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
4984 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
4985 initialized = TRUE;
4986 }
4987 }
4991 #ifndef JDK6_OR_EARLIER
4993 void os::Kernel32Dll::initialize() {
4994 initializeCommon();
4995 }
4998 // Kernel32 API
4999 inline BOOL os::Kernel32Dll::SwitchToThread() {
5000 return ::SwitchToThread();
5001 }
5003 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5004 return true;
5005 }
5007 // Help tools
5008 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5009 return true;
5010 }
5012 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5013 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5014 }
5016 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5017 return ::Module32First(hSnapshot, lpme);
5018 }
5020 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5021 return ::Module32Next(hSnapshot, lpme);
5022 }
5025 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5026 return true;
5027 }
5029 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5030 ::GetNativeSystemInfo(lpSystemInfo);
5031 }
5033 // PSAPI API
5034 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5035 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5036 }
5038 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5039 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5040 }
5042 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5043 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5044 }
5046 inline BOOL os::PSApiDll::PSApiAvailable() {
5047 return true;
5048 }
5051 // WinSock2 API
5052 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5053 return ::WSAStartup(wVersionRequested, lpWSAData);
5054 }
5056 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5057 return ::gethostbyname(name);
5058 }
5060 inline BOOL os::WinSock2Dll::WinSock2Available() {
5061 return true;
5062 }
5064 // Advapi API
5065 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5066 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5067 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5068 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5069 BufferLength, PreviousState, ReturnLength);
5070 }
5072 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5073 PHANDLE TokenHandle) {
5074 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5075 }
5077 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5078 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5079 }
5081 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5082 return true;
5083 }
5085 #else
5086 // Kernel32 API
5087 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5088 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5089 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5090 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5091 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5093 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5094 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5095 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5096 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5097 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5100 void os::Kernel32Dll::initialize() {
5101 if (!initialized) {
5102 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5103 assert(handle != NULL, "Just check");
5105 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5106 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5107 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5108 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5109 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5110 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5111 initializeCommon(); // resolve the functions that always need resolving
5113 initialized = TRUE;
5114 }
5115 }
5117 BOOL os::Kernel32Dll::SwitchToThread() {
5118 assert(initialized && _SwitchToThread != NULL,
5119 "SwitchToThreadAvailable() not yet called");
5120 return _SwitchToThread();
5121 }
5124 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5125 if (!initialized) {
5126 initialize();
5127 }
5128 return _SwitchToThread != NULL;
5129 }
5131 // Help tools
5132 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5133 if (!initialized) {
5134 initialize();
5135 }
5136 return _CreateToolhelp32Snapshot != NULL &&
5137 _Module32First != NULL &&
5138 _Module32Next != NULL;
5139 }
5141 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5142 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5143 "HelpToolsAvailable() not yet called");
5145 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5146 }
5148 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5149 assert(initialized && _Module32First != NULL,
5150 "HelpToolsAvailable() not yet called");
5152 return _Module32First(hSnapshot, lpme);
5153 }
5155 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5156 assert(initialized && _Module32Next != NULL,
5157 "HelpToolsAvailable() not yet called");
5159 return _Module32Next(hSnapshot, lpme);
5160 }
5163 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5164 if (!initialized) {
5165 initialize();
5166 }
5167 return _GetNativeSystemInfo != NULL;
5168 }
5170 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5171 assert(initialized && _GetNativeSystemInfo != NULL,
5172 "GetNativeSystemInfoAvailable() not yet called");
5174 _GetNativeSystemInfo(lpSystemInfo);
5175 }
5179 // PSAPI API
5182 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5183 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5184 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5186 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5187 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5188 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5189 BOOL os::PSApiDll::initialized = FALSE;
5191 void os::PSApiDll::initialize() {
5192 if (!initialized) {
5193 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5194 if (handle != NULL) {
5195 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5196 "EnumProcessModules");
5197 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5198 "GetModuleFileNameExA");
5199 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5200 "GetModuleInformation");
5201 }
5202 initialized = TRUE;
5203 }
5204 }
5208 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5209 assert(initialized && _EnumProcessModules != NULL,
5210 "PSApiAvailable() not yet called");
5211 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5212 }
5214 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5215 assert(initialized && _GetModuleFileNameEx != NULL,
5216 "PSApiAvailable() not yet called");
5217 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5218 }
5220 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5221 assert(initialized && _GetModuleInformation != NULL,
5222 "PSApiAvailable() not yet called");
5223 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5224 }
5226 BOOL os::PSApiDll::PSApiAvailable() {
5227 if (!initialized) {
5228 initialize();
5229 }
5230 return _EnumProcessModules != NULL &&
5231 _GetModuleFileNameEx != NULL &&
5232 _GetModuleInformation != NULL;
5233 }
5236 // WinSock2 API
5237 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5238 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5240 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5241 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5242 BOOL os::WinSock2Dll::initialized = FALSE;
5244 void os::WinSock2Dll::initialize() {
5245 if (!initialized) {
5246 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5247 if (handle != NULL) {
5248 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5249 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5250 }
5251 initialized = TRUE;
5252 }
5253 }
5256 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5257 assert(initialized && _WSAStartup != NULL,
5258 "WinSock2Available() not yet called");
5259 return _WSAStartup(wVersionRequested, lpWSAData);
5260 }
5262 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5263 assert(initialized && _gethostbyname != NULL,
5264 "WinSock2Available() not yet called");
5265 return _gethostbyname(name);
5266 }
5268 BOOL os::WinSock2Dll::WinSock2Available() {
5269 if (!initialized) {
5270 initialize();
5271 }
5272 return _WSAStartup != NULL &&
5273 _gethostbyname != NULL;
5274 }
5276 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5277 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5278 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5280 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5281 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5282 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5283 BOOL os::Advapi32Dll::initialized = FALSE;
5285 void os::Advapi32Dll::initialize() {
5286 if (!initialized) {
5287 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5288 if (handle != NULL) {
5289 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5290 "AdjustTokenPrivileges");
5291 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5292 "OpenProcessToken");
5293 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5294 "LookupPrivilegeValueA");
5295 }
5296 initialized = TRUE;
5297 }
5298 }
5300 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5301 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5302 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5303 assert(initialized && _AdjustTokenPrivileges != NULL,
5304 "AdvapiAvailable() not yet called");
5305 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5306 BufferLength, PreviousState, ReturnLength);
5307 }
5309 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5310 PHANDLE TokenHandle) {
5311 assert(initialized && _OpenProcessToken != NULL,
5312 "AdvapiAvailable() not yet called");
5313 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5314 }
5316 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5317 assert(initialized && _LookupPrivilegeValue != NULL,
5318 "AdvapiAvailable() not yet called");
5319 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5320 }
5322 BOOL os::Advapi32Dll::AdvapiAvailable() {
5323 if (!initialized) {
5324 initialize();
5325 }
5326 return _AdjustTokenPrivileges != NULL &&
5327 _OpenProcessToken != NULL &&
5328 _LookupPrivilegeValue != NULL;
5329 }
5331 #endif