Mon, 28 Feb 2011 14:19:52 +0100
7022037: Pause when exiting if debugger is attached on windows
Reviewed-by: dsamersoff, kamg, hosterda
1 /*
2 * Copyright (c) 1997, 2011, 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 #ifdef _WIN64
26 // Must be at least Windows 2000 or XP to use VectoredExceptions
27 #define _WIN32_WINNT 0x500
28 #endif
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_windows.h"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "mutex_windows.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm.h"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/extendedPC.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/mutexLocker.hpp"
54 #include "runtime/objectMonitor.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/runtimeService.hpp"
64 #include "thread_windows.inline.hpp"
65 #include "utilities/decoder.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
70 #ifdef TARGET_ARCH_x86
71 # include "assembler_x86.inline.hpp"
72 # include "nativeInst_x86.hpp"
73 #endif
74 #ifdef COMPILER1
75 #include "c1/c1_Runtime1.hpp"
76 #endif
77 #ifdef COMPILER2
78 #include "opto/runtime.hpp"
79 #endif
81 #ifdef _DEBUG
82 #include <crtdbg.h>
83 #endif
86 #include <windows.h>
87 #include <sys/types.h>
88 #include <sys/stat.h>
89 #include <sys/timeb.h>
90 #include <objidl.h>
91 #include <shlobj.h>
93 #include <malloc.h>
94 #include <signal.h>
95 #include <direct.h>
96 #include <errno.h>
97 #include <fcntl.h>
98 #include <io.h>
99 #include <process.h> // For _beginthreadex(), _endthreadex()
100 #include <imagehlp.h> // For os::dll_address_to_function_name
102 /* for enumerating dll libraries */
103 #include <tlhelp32.h>
104 #include <vdmdbg.h>
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
123 #ifdef _WIN64
124 PVOID topLevelVectoredExceptionHandler = NULL;
125 #endif
127 #ifdef _M_IA64
128 #define __CPU__ ia64
129 #elif _M_AMD64
130 #define __CPU__ amd64
131 #else
132 #define __CPU__ i486
133 #endif
135 // save DLL module handle, used by GetModuleFileName
137 HINSTANCE vm_lib_handle;
138 static int getLastErrorString(char *buf, size_t len);
140 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
141 switch (reason) {
142 case DLL_PROCESS_ATTACH:
143 vm_lib_handle = hinst;
144 if(ForceTimeHighResolution)
145 timeBeginPeriod(1L);
146 break;
147 case DLL_PROCESS_DETACH:
148 if(ForceTimeHighResolution)
149 timeEndPeriod(1L);
150 #ifdef _WIN64
151 if (topLevelVectoredExceptionHandler != NULL) {
152 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
153 topLevelVectoredExceptionHandler = NULL;
154 }
155 #endif
156 break;
157 default:
158 break;
159 }
160 return true;
161 }
163 static inline double fileTimeAsDouble(FILETIME* time) {
164 const double high = (double) ((unsigned int) ~0);
165 const double split = 10000000.0;
166 double result = (time->dwLowDateTime / split) +
167 time->dwHighDateTime * (high/split);
168 return result;
169 }
171 // Implementation of os
173 bool os::getenv(const char* name, char* buffer, int len) {
174 int result = GetEnvironmentVariable(name, buffer, len);
175 return result > 0 && result < len;
176 }
179 // No setuid programs under Windows.
180 bool os::have_special_privileges() {
181 return false;
182 }
185 // This method is a periodic task to check for misbehaving JNI applications
186 // under CheckJNI, we can add any periodic checks here.
187 // For Windows at the moment does nothing
188 void os::run_periodic_checks() {
189 return;
190 }
192 #ifndef _WIN64
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197 #endif
198 void os::init_system_properties_values() {
199 /* sysclasspath, java_home, dll_dir */
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 char *bin = "\\bin";
205 char home_dir[MAX_PATH];
207 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
208 os::jvm_path(home_dir, sizeof(home_dir));
209 // Found the full path to jvm[_g].dll.
210 // Now cut the path to <java_home>/jre if we can.
211 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
212 pslash = strrchr(home_dir, '\\');
213 if (pslash != NULL) {
214 *pslash = '\0'; /* get rid of \{client|server} */
215 pslash = strrchr(home_dir, '\\');
216 if (pslash != NULL)
217 *pslash = '\0'; /* get rid of \bin */
218 }
219 }
221 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
222 if (home_path == NULL)
223 return;
224 strcpy(home_path, home_dir);
225 Arguments::set_java_home(home_path);
227 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
228 if (dll_path == NULL)
229 return;
230 strcpy(dll_path, home_dir);
231 strcat(dll_path, bin);
232 Arguments::set_dll_dir(dll_path);
234 if (!set_boot_path('\\', ';'))
235 return;
236 }
238 /* library_path */
239 #define EXT_DIR "\\lib\\ext"
240 #define BIN_DIR "\\bin"
241 #define PACKAGE_DIR "\\Sun\\Java"
242 {
243 /* Win32 library search order (See the documentation for LoadLibrary):
244 *
245 * 1. The directory from which application is loaded.
246 * 2. The current directory
247 * 3. The system wide Java Extensions directory (Java only)
248 * 4. System directory (GetSystemDirectory)
249 * 5. Windows directory (GetWindowsDirectory)
250 * 6. The PATH environment variable
251 */
253 char *library_path;
254 char tmp[MAX_PATH];
255 char *path_str = ::getenv("PATH");
257 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
258 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
260 library_path[0] = '\0';
262 GetModuleFileName(NULL, tmp, sizeof(tmp));
263 *(strrchr(tmp, '\\')) = '\0';
264 strcat(library_path, tmp);
266 strcat(library_path, ";.");
268 GetWindowsDirectory(tmp, sizeof(tmp));
269 strcat(library_path, ";");
270 strcat(library_path, tmp);
271 strcat(library_path, PACKAGE_DIR BIN_DIR);
273 GetSystemDirectory(tmp, sizeof(tmp));
274 strcat(library_path, ";");
275 strcat(library_path, tmp);
277 GetWindowsDirectory(tmp, sizeof(tmp));
278 strcat(library_path, ";");
279 strcat(library_path, tmp);
281 if (path_str) {
282 strcat(library_path, ";");
283 strcat(library_path, path_str);
284 }
286 Arguments::set_library_path(library_path);
287 FREE_C_HEAP_ARRAY(char, library_path);
288 }
290 /* Default extensions directory */
291 {
292 char path[MAX_PATH];
293 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
294 GetWindowsDirectory(path, MAX_PATH);
295 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
296 path, PACKAGE_DIR, EXT_DIR);
297 Arguments::set_ext_dirs(buf);
298 }
299 #undef EXT_DIR
300 #undef BIN_DIR
301 #undef PACKAGE_DIR
303 /* Default endorsed standards directory. */
304 {
305 #define ENDORSED_DIR "\\lib\\endorsed"
306 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
307 char * buf = NEW_C_HEAP_ARRAY(char, len);
308 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
309 Arguments::set_endorsed_dirs(buf);
310 #undef ENDORSED_DIR
311 }
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
318 // Done
319 return;
320 }
322 void os::breakpoint() {
323 DebugBreak();
324 }
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
331 // Returns an estimate of the current stack pointer. Result must be guaranteed
332 // to point into the calling threads stack, and be no lower than the current
333 // stack pointer.
335 address os::current_stack_pointer() {
336 int dummy;
337 address sp = (address)&dummy;
338 return sp;
339 }
341 // os::current_stack_base()
342 //
343 // Returns the base of the stack, which is the stack's
344 // starting address. This function must be called
345 // while running on the stack of the thread being queried.
347 address os::current_stack_base() {
348 MEMORY_BASIC_INFORMATION minfo;
349 address stack_bottom;
350 size_t stack_size;
352 VirtualQuery(&minfo, &minfo, sizeof(minfo));
353 stack_bottom = (address)minfo.AllocationBase;
354 stack_size = minfo.RegionSize;
356 // Add up the sizes of all the regions with the same
357 // AllocationBase.
358 while( 1 )
359 {
360 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
361 if ( stack_bottom == (address)minfo.AllocationBase )
362 stack_size += minfo.RegionSize;
363 else
364 break;
365 }
367 #ifdef _M_IA64
368 // IA64 has memory and register stacks
369 stack_size = stack_size / 2;
370 #endif
371 return stack_bottom + stack_size;
372 }
374 size_t os::current_stack_size() {
375 size_t sz;
376 MEMORY_BASIC_INFORMATION minfo;
377 VirtualQuery(&minfo, &minfo, sizeof(minfo));
378 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
379 return sz;
380 }
382 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
383 const struct tm* time_struct_ptr = localtime(clock);
384 if (time_struct_ptr != NULL) {
385 *res = *time_struct_ptr;
386 return res;
387 }
388 return NULL;
389 }
391 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
393 // Thread start routine for all new Java threads
394 static unsigned __stdcall java_start(Thread* thread) {
395 // Try to randomize the cache line index of hot stack frames.
396 // This helps when threads of the same stack traces evict each other's
397 // cache lines. The threads can be either from the same JVM instance, or
398 // from different JVM instances. The benefit is especially true for
399 // processors with hyperthreading technology.
400 static int counter = 0;
401 int pid = os::current_process_id();
402 _alloca(((pid ^ counter++) & 7) * 128);
404 OSThread* osthr = thread->osthread();
405 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
407 if (UseNUMA) {
408 int lgrp_id = os::numa_get_group_id();
409 if (lgrp_id != -1) {
410 thread->set_lgrp_id(lgrp_id);
411 }
412 }
415 if (UseVectoredExceptions) {
416 // If we are using vectored exception we don't need to set a SEH
417 thread->run();
418 }
419 else {
420 // Install a win32 structured exception handler around every thread created
421 // by VM, so VM can genrate error dump when an exception occurred in non-
422 // Java thread (e.g. VM thread).
423 __try {
424 thread->run();
425 } __except(topLevelExceptionFilter(
426 (_EXCEPTION_POINTERS*)_exception_info())) {
427 // Nothing to do.
428 }
429 }
431 // One less thread is executing
432 // When the VMThread gets here, the main thread may have already exited
433 // which frees the CodeHeap containing the Atomic::add code
434 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
435 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
436 }
438 return 0;
439 }
441 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
442 // Allocate the OSThread object
443 OSThread* osthread = new OSThread(NULL, NULL);
444 if (osthread == NULL) return NULL;
446 // Initialize support for Java interrupts
447 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
448 if (interrupt_event == NULL) {
449 delete osthread;
450 return NULL;
451 }
452 osthread->set_interrupt_event(interrupt_event);
454 // Store info on the Win32 thread into the OSThread
455 osthread->set_thread_handle(thread_handle);
456 osthread->set_thread_id(thread_id);
458 if (UseNUMA) {
459 int lgrp_id = os::numa_get_group_id();
460 if (lgrp_id != -1) {
461 thread->set_lgrp_id(lgrp_id);
462 }
463 }
465 // Initial thread state is INITIALIZED, not SUSPENDED
466 osthread->set_state(INITIALIZED);
468 return osthread;
469 }
472 bool os::create_attached_thread(JavaThread* thread) {
473 #ifdef ASSERT
474 thread->verify_not_published();
475 #endif
476 HANDLE thread_h;
477 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
478 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
479 fatal("DuplicateHandle failed\n");
480 }
481 OSThread* osthread = create_os_thread(thread, thread_h,
482 (int)current_thread_id());
483 if (osthread == NULL) {
484 return false;
485 }
487 // Initial thread state is RUNNABLE
488 osthread->set_state(RUNNABLE);
490 thread->set_osthread(osthread);
491 return true;
492 }
494 bool os::create_main_thread(JavaThread* thread) {
495 #ifdef ASSERT
496 thread->verify_not_published();
497 #endif
498 if (_starting_thread == NULL) {
499 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
500 if (_starting_thread == NULL) {
501 return false;
502 }
503 }
505 // The primordial thread is runnable from the start)
506 _starting_thread->set_state(RUNNABLE);
508 thread->set_osthread(_starting_thread);
509 return true;
510 }
512 // Allocate and initialize a new OSThread
513 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
514 unsigned thread_id;
516 // Allocate the OSThread object
517 OSThread* osthread = new OSThread(NULL, NULL);
518 if (osthread == NULL) {
519 return false;
520 }
522 // Initialize support for Java interrupts
523 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
524 if (interrupt_event == NULL) {
525 delete osthread;
526 return NULL;
527 }
528 osthread->set_interrupt_event(interrupt_event);
529 osthread->set_interrupted(false);
531 thread->set_osthread(osthread);
533 if (stack_size == 0) {
534 switch (thr_type) {
535 case os::java_thread:
536 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
537 if (JavaThread::stack_size_at_create() > 0)
538 stack_size = JavaThread::stack_size_at_create();
539 break;
540 case os::compiler_thread:
541 if (CompilerThreadStackSize > 0) {
542 stack_size = (size_t)(CompilerThreadStackSize * K);
543 break;
544 } // else fall through:
545 // use VMThreadStackSize if CompilerThreadStackSize is not defined
546 case os::vm_thread:
547 case os::pgc_thread:
548 case os::cgc_thread:
549 case os::watcher_thread:
550 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
551 break;
552 }
553 }
555 // Create the Win32 thread
556 //
557 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
558 // does not specify stack size. Instead, it specifies the size of
559 // initially committed space. The stack size is determined by
560 // PE header in the executable. If the committed "stack_size" is larger
561 // than default value in the PE header, the stack is rounded up to the
562 // nearest multiple of 1MB. For example if the launcher has default
563 // stack size of 320k, specifying any size less than 320k does not
564 // affect the actual stack size at all, it only affects the initial
565 // commitment. On the other hand, specifying 'stack_size' larger than
566 // default value may cause significant increase in memory usage, because
567 // not only the stack space will be rounded up to MB, but also the
568 // entire space is committed upfront.
569 //
570 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
571 // for CreateThread() that can treat 'stack_size' as stack size. However we
572 // are not supposed to call CreateThread() directly according to MSDN
573 // document because JVM uses C runtime library. The good news is that the
574 // flag appears to work with _beginthredex() as well.
576 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
577 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
578 #endif
580 HANDLE thread_handle =
581 (HANDLE)_beginthreadex(NULL,
582 (unsigned)stack_size,
583 (unsigned (__stdcall *)(void*)) java_start,
584 thread,
585 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
586 &thread_id);
587 if (thread_handle == NULL) {
588 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
589 // without the flag.
590 thread_handle =
591 (HANDLE)_beginthreadex(NULL,
592 (unsigned)stack_size,
593 (unsigned (__stdcall *)(void*)) java_start,
594 thread,
595 CREATE_SUSPENDED,
596 &thread_id);
597 }
598 if (thread_handle == NULL) {
599 // Need to clean up stuff we've allocated so far
600 CloseHandle(osthread->interrupt_event());
601 thread->set_osthread(NULL);
602 delete osthread;
603 return NULL;
604 }
606 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
608 // Store info on the Win32 thread into the OSThread
609 osthread->set_thread_handle(thread_handle);
610 osthread->set_thread_id(thread_id);
612 // Initial thread state is INITIALIZED, not SUSPENDED
613 osthread->set_state(INITIALIZED);
615 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
616 return true;
617 }
620 // Free Win32 resources related to the OSThread
621 void os::free_thread(OSThread* osthread) {
622 assert(osthread != NULL, "osthread not set");
623 CloseHandle(osthread->thread_handle());
624 CloseHandle(osthread->interrupt_event());
625 delete osthread;
626 }
629 static int has_performance_count = 0;
630 static jlong first_filetime;
631 static jlong initial_performance_count;
632 static jlong performance_frequency;
635 jlong as_long(LARGE_INTEGER x) {
636 jlong result = 0; // initialization to avoid warning
637 set_high(&result, x.HighPart);
638 set_low(&result, x.LowPart);
639 return result;
640 }
643 jlong os::elapsed_counter() {
644 LARGE_INTEGER count;
645 if (has_performance_count) {
646 QueryPerformanceCounter(&count);
647 return as_long(count) - initial_performance_count;
648 } else {
649 FILETIME wt;
650 GetSystemTimeAsFileTime(&wt);
651 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
652 }
653 }
656 jlong os::elapsed_frequency() {
657 if (has_performance_count) {
658 return performance_frequency;
659 } else {
660 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
661 return 10000000;
662 }
663 }
666 julong os::available_memory() {
667 return win32::available_memory();
668 }
670 julong os::win32::available_memory() {
671 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
672 // value if total memory is larger than 4GB
673 MEMORYSTATUSEX ms;
674 ms.dwLength = sizeof(ms);
675 GlobalMemoryStatusEx(&ms);
677 return (julong)ms.ullAvailPhys;
678 }
680 julong os::physical_memory() {
681 return win32::physical_memory();
682 }
684 julong os::allocatable_physical_memory(julong size) {
685 #ifdef _LP64
686 return size;
687 #else
688 // Limit to 1400m because of the 2gb address space wall
689 return MIN2(size, (julong)1400*M);
690 #endif
691 }
693 // VC6 lacks DWORD_PTR
694 #if _MSC_VER < 1300
695 typedef UINT_PTR DWORD_PTR;
696 #endif
698 int os::active_processor_count() {
699 DWORD_PTR lpProcessAffinityMask = 0;
700 DWORD_PTR lpSystemAffinityMask = 0;
701 int proc_count = processor_count();
702 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
703 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
704 // Nof active processors is number of bits in process affinity mask
705 int bitcount = 0;
706 while (lpProcessAffinityMask != 0) {
707 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
708 bitcount++;
709 }
710 return bitcount;
711 } else {
712 return proc_count;
713 }
714 }
716 bool os::distribute_processes(uint length, uint* distribution) {
717 // Not yet implemented.
718 return false;
719 }
721 bool os::bind_to_processor(uint processor_id) {
722 // Not yet implemented.
723 return false;
724 }
726 static void initialize_performance_counter() {
727 LARGE_INTEGER count;
728 if (QueryPerformanceFrequency(&count)) {
729 has_performance_count = 1;
730 performance_frequency = as_long(count);
731 QueryPerformanceCounter(&count);
732 initial_performance_count = as_long(count);
733 } else {
734 has_performance_count = 0;
735 FILETIME wt;
736 GetSystemTimeAsFileTime(&wt);
737 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
738 }
739 }
742 double os::elapsedTime() {
743 return (double) elapsed_counter() / (double) elapsed_frequency();
744 }
747 // Windows format:
748 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
749 // Java format:
750 // Java standards require the number of milliseconds since 1/1/1970
752 // Constant offset - calculated using offset()
753 static jlong _offset = 116444736000000000;
754 // Fake time counter for reproducible results when debugging
755 static jlong fake_time = 0;
757 #ifdef ASSERT
758 // Just to be safe, recalculate the offset in debug mode
759 static jlong _calculated_offset = 0;
760 static int _has_calculated_offset = 0;
762 jlong offset() {
763 if (_has_calculated_offset) return _calculated_offset;
764 SYSTEMTIME java_origin;
765 java_origin.wYear = 1970;
766 java_origin.wMonth = 1;
767 java_origin.wDayOfWeek = 0; // ignored
768 java_origin.wDay = 1;
769 java_origin.wHour = 0;
770 java_origin.wMinute = 0;
771 java_origin.wSecond = 0;
772 java_origin.wMilliseconds = 0;
773 FILETIME jot;
774 if (!SystemTimeToFileTime(&java_origin, &jot)) {
775 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
776 }
777 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
778 _has_calculated_offset = 1;
779 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
780 return _calculated_offset;
781 }
782 #else
783 jlong offset() {
784 return _offset;
785 }
786 #endif
788 jlong windows_to_java_time(FILETIME wt) {
789 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
790 return (a - offset()) / 10000;
791 }
793 FILETIME java_to_windows_time(jlong l) {
794 jlong a = (l * 10000) + offset();
795 FILETIME result;
796 result.dwHighDateTime = high(a);
797 result.dwLowDateTime = low(a);
798 return result;
799 }
801 // For now, we say that Windows does not support vtime. I have no idea
802 // whether it can actually be made to (DLD, 9/13/05).
804 bool os::supports_vtime() { return false; }
805 bool os::enable_vtime() { return false; }
806 bool os::vtime_enabled() { return false; }
807 double os::elapsedVTime() {
808 // better than nothing, but not much
809 return elapsedTime();
810 }
812 jlong os::javaTimeMillis() {
813 if (UseFakeTimers) {
814 return fake_time++;
815 } else {
816 FILETIME wt;
817 GetSystemTimeAsFileTime(&wt);
818 return windows_to_java_time(wt);
819 }
820 }
822 #define NANOS_PER_SEC CONST64(1000000000)
823 #define NANOS_PER_MILLISEC 1000000
824 jlong os::javaTimeNanos() {
825 if (!has_performance_count) {
826 return javaTimeMillis() * NANOS_PER_MILLISEC; // the best we can do.
827 } else {
828 LARGE_INTEGER current_count;
829 QueryPerformanceCounter(¤t_count);
830 double current = as_long(current_count);
831 double freq = performance_frequency;
832 jlong time = (jlong)((current/freq) * NANOS_PER_SEC);
833 return time;
834 }
835 }
837 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
838 if (!has_performance_count) {
839 // javaTimeMillis() doesn't have much percision,
840 // but it is not going to wrap -- so all 64 bits
841 info_ptr->max_value = ALL_64_BITS;
843 // this is a wall clock timer, so may skip
844 info_ptr->may_skip_backward = true;
845 info_ptr->may_skip_forward = true;
846 } else {
847 jlong freq = performance_frequency;
848 if (freq < NANOS_PER_SEC) {
849 // the performance counter is 64 bits and we will
850 // be multiplying it -- so no wrap in 64 bits
851 info_ptr->max_value = ALL_64_BITS;
852 } else if (freq > NANOS_PER_SEC) {
853 // use the max value the counter can reach to
854 // determine the max value which could be returned
855 julong max_counter = (julong)ALL_64_BITS;
856 info_ptr->max_value = (jlong)(max_counter / (freq / NANOS_PER_SEC));
857 } else {
858 // the performance counter is 64 bits and we will
859 // be using it directly -- so no wrap in 64 bits
860 info_ptr->max_value = ALL_64_BITS;
861 }
863 // using a counter, so no skipping
864 info_ptr->may_skip_backward = false;
865 info_ptr->may_skip_forward = false;
866 }
867 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
868 }
870 char* os::local_time_string(char *buf, size_t buflen) {
871 SYSTEMTIME st;
872 GetLocalTime(&st);
873 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
874 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
875 return buf;
876 }
878 bool os::getTimesSecs(double* process_real_time,
879 double* process_user_time,
880 double* process_system_time) {
881 HANDLE h_process = GetCurrentProcess();
882 FILETIME create_time, exit_time, kernel_time, user_time;
883 BOOL result = GetProcessTimes(h_process,
884 &create_time,
885 &exit_time,
886 &kernel_time,
887 &user_time);
888 if (result != 0) {
889 FILETIME wt;
890 GetSystemTimeAsFileTime(&wt);
891 jlong rtc_millis = windows_to_java_time(wt);
892 jlong user_millis = windows_to_java_time(user_time);
893 jlong system_millis = windows_to_java_time(kernel_time);
894 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
895 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
896 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
897 return true;
898 } else {
899 return false;
900 }
901 }
903 void os::shutdown() {
905 // allow PerfMemory to attempt cleanup of any persistent resources
906 perfMemory_exit();
908 // flush buffered output, finish log files
909 ostream_abort();
911 // Check for abort hook
912 abort_hook_t abort_hook = Arguments::abort_hook();
913 if (abort_hook != NULL) {
914 abort_hook();
915 }
916 }
919 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
920 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
922 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
923 HINSTANCE dbghelp;
924 EXCEPTION_POINTERS ep;
925 MINIDUMP_EXCEPTION_INFORMATION mei;
926 HANDLE hProcess = GetCurrentProcess();
927 DWORD processId = GetCurrentProcessId();
928 HANDLE dumpFile;
929 MINIDUMP_TYPE dumpType;
930 static const char* cwd;
932 // If running on a client version of Windows and user has not explicitly enabled dumping
933 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
934 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
935 return;
936 // If running on a server version of Windows and user has explictly disabled dumping
937 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
938 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
939 return;
940 }
942 dbghelp = LoadLibrary("DBGHELP.DLL");
944 if (dbghelp == NULL) {
945 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
946 return;
947 }
949 _MiniDumpWriteDump = CAST_TO_FN_PTR(
950 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
951 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
952 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
954 if (_MiniDumpWriteDump == NULL) {
955 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
956 return;
957 }
959 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
961 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
962 // API_VERSION_NUMBER 11 or higher contains the ones we want though
963 #if API_VERSION_NUMBER >= 11
964 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
965 MiniDumpWithUnloadedModules);
966 #endif
968 cwd = get_current_directory(NULL, 0);
969 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
970 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
972 if (dumpFile == INVALID_HANDLE_VALUE) {
973 VMError::report_coredump_status("Failed to create file for dumping", false);
974 return;
975 }
977 ep.ContextRecord = (PCONTEXT) contextRecord;
978 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
980 mei.ThreadId = GetCurrentThreadId();
981 mei.ExceptionPointers = &ep;
983 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
984 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
985 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, &mei, NULL, NULL) == false &&
986 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, &mei, NULL, NULL) == false) {
987 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
988 } else {
989 VMError::report_coredump_status(buffer, true);
990 }
992 CloseHandle(dumpFile);
993 }
997 void os::abort(bool dump_core)
998 {
999 os::shutdown();
1000 // no core dump on Windows
1001 ::exit(1);
1002 }
1004 // Die immediately, no exit hook, no abort hook, no cleanup.
1005 void os::die() {
1006 _exit(-1);
1007 }
1009 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1010 // * dirent_md.c 1.15 00/02/02
1011 //
1012 // The declarations for DIR and struct dirent are in jvm_win32.h.
1014 /* Caller must have already run dirname through JVM_NativePath, which removes
1015 duplicate slashes and converts all instances of '/' into '\\'. */
1017 DIR *
1018 os::opendir(const char *dirname)
1019 {
1020 assert(dirname != NULL, "just checking"); // hotspot change
1021 DIR *dirp = (DIR *)malloc(sizeof(DIR));
1022 DWORD fattr; // hotspot change
1023 char alt_dirname[4] = { 0, 0, 0, 0 };
1025 if (dirp == 0) {
1026 errno = ENOMEM;
1027 return 0;
1028 }
1030 /*
1031 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1032 * as a directory in FindFirstFile(). We detect this case here and
1033 * prepend the current drive name.
1034 */
1035 if (dirname[1] == '\0' && dirname[0] == '\\') {
1036 alt_dirname[0] = _getdrive() + 'A' - 1;
1037 alt_dirname[1] = ':';
1038 alt_dirname[2] = '\\';
1039 alt_dirname[3] = '\0';
1040 dirname = alt_dirname;
1041 }
1043 dirp->path = (char *)malloc(strlen(dirname) + 5);
1044 if (dirp->path == 0) {
1045 free(dirp);
1046 errno = ENOMEM;
1047 return 0;
1048 }
1049 strcpy(dirp->path, dirname);
1051 fattr = GetFileAttributes(dirp->path);
1052 if (fattr == 0xffffffff) {
1053 free(dirp->path);
1054 free(dirp);
1055 errno = ENOENT;
1056 return 0;
1057 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1058 free(dirp->path);
1059 free(dirp);
1060 errno = ENOTDIR;
1061 return 0;
1062 }
1064 /* Append "*.*", or possibly "\\*.*", to path */
1065 if (dirp->path[1] == ':'
1066 && (dirp->path[2] == '\0'
1067 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1068 /* No '\\' needed for cases like "Z:" or "Z:\" */
1069 strcat(dirp->path, "*.*");
1070 } else {
1071 strcat(dirp->path, "\\*.*");
1072 }
1074 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1075 if (dirp->handle == INVALID_HANDLE_VALUE) {
1076 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1077 free(dirp->path);
1078 free(dirp);
1079 errno = EACCES;
1080 return 0;
1081 }
1082 }
1083 return dirp;
1084 }
1086 /* parameter dbuf unused on Windows */
1088 struct dirent *
1089 os::readdir(DIR *dirp, dirent *dbuf)
1090 {
1091 assert(dirp != NULL, "just checking"); // hotspot change
1092 if (dirp->handle == INVALID_HANDLE_VALUE) {
1093 return 0;
1094 }
1096 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1098 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1099 if (GetLastError() == ERROR_INVALID_HANDLE) {
1100 errno = EBADF;
1101 return 0;
1102 }
1103 FindClose(dirp->handle);
1104 dirp->handle = INVALID_HANDLE_VALUE;
1105 }
1107 return &dirp->dirent;
1108 }
1110 int
1111 os::closedir(DIR *dirp)
1112 {
1113 assert(dirp != NULL, "just checking"); // hotspot change
1114 if (dirp->handle != INVALID_HANDLE_VALUE) {
1115 if (!FindClose(dirp->handle)) {
1116 errno = EBADF;
1117 return -1;
1118 }
1119 dirp->handle = INVALID_HANDLE_VALUE;
1120 }
1121 free(dirp->path);
1122 free(dirp);
1123 return 0;
1124 }
1126 // This must be hard coded because it's the system's temporary
1127 // directory not the java application's temp directory, ala java.io.tmpdir.
1128 const char* os::get_temp_directory() {
1129 static char path_buf[MAX_PATH];
1130 if (GetTempPath(MAX_PATH, path_buf)>0)
1131 return path_buf;
1132 else{
1133 path_buf[0]='\0';
1134 return path_buf;
1135 }
1136 }
1138 static bool file_exists(const char* filename) {
1139 if (filename == NULL || strlen(filename) == 0) {
1140 return false;
1141 }
1142 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1143 }
1145 void os::dll_build_name(char *buffer, size_t buflen,
1146 const char* pname, const char* fname) {
1147 const size_t pnamelen = pname ? strlen(pname) : 0;
1148 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1150 // Quietly truncates on buffer overflow. Should be an error.
1151 if (pnamelen + strlen(fname) + 10 > buflen) {
1152 *buffer = '\0';
1153 return;
1154 }
1156 if (pnamelen == 0) {
1157 jio_snprintf(buffer, buflen, "%s.dll", fname);
1158 } else if (c == ':' || c == '\\') {
1159 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1160 } else if (strchr(pname, *os::path_separator()) != NULL) {
1161 int n;
1162 char** pelements = split_path(pname, &n);
1163 for (int i = 0 ; i < n ; i++) {
1164 char* path = pelements[i];
1165 // Really shouldn't be NULL, but check can't hurt
1166 size_t plen = (path == NULL) ? 0 : strlen(path);
1167 if (plen == 0) {
1168 continue; // skip the empty path values
1169 }
1170 const char lastchar = path[plen - 1];
1171 if (lastchar == ':' || lastchar == '\\') {
1172 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1173 } else {
1174 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1175 }
1176 if (file_exists(buffer)) {
1177 break;
1178 }
1179 }
1180 // release the storage
1181 for (int i = 0 ; i < n ; i++) {
1182 if (pelements[i] != NULL) {
1183 FREE_C_HEAP_ARRAY(char, pelements[i]);
1184 }
1185 }
1186 if (pelements != NULL) {
1187 FREE_C_HEAP_ARRAY(char*, pelements);
1188 }
1189 } else {
1190 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1191 }
1192 }
1194 // Needs to be in os specific directory because windows requires another
1195 // header file <direct.h>
1196 const char* os::get_current_directory(char *buf, int buflen) {
1197 return _getcwd(buf, buflen);
1198 }
1200 //-----------------------------------------------------------
1201 // Helper functions for fatal error handler
1203 // The following library functions are resolved dynamically at runtime:
1205 // PSAPI functions, for Windows NT, 2000, XP
1207 // psapi.h doesn't come with Visual Studio 6; it can be downloaded as Platform
1208 // SDK from Microsoft. Here are the definitions copied from psapi.h
1209 typedef struct _MODULEINFO {
1210 LPVOID lpBaseOfDll;
1211 DWORD SizeOfImage;
1212 LPVOID EntryPoint;
1213 } MODULEINFO, *LPMODULEINFO;
1215 static BOOL (WINAPI *_EnumProcessModules) ( HANDLE, HMODULE *, DWORD, LPDWORD );
1216 static DWORD (WINAPI *_GetModuleFileNameEx) ( HANDLE, HMODULE, LPTSTR, DWORD );
1217 static BOOL (WINAPI *_GetModuleInformation)( HANDLE, HMODULE, LPMODULEINFO, DWORD );
1219 // ToolHelp Functions, for Windows 95, 98 and ME
1221 static HANDLE(WINAPI *_CreateToolhelp32Snapshot)(DWORD,DWORD) ;
1222 static BOOL (WINAPI *_Module32First) (HANDLE,LPMODULEENTRY32) ;
1223 static BOOL (WINAPI *_Module32Next) (HANDLE,LPMODULEENTRY32) ;
1225 bool _has_psapi;
1226 bool _psapi_init = false;
1227 bool _has_toolhelp;
1229 static bool _init_psapi() {
1230 HINSTANCE psapi = LoadLibrary( "PSAPI.DLL" ) ;
1231 if( psapi == NULL ) return false ;
1233 _EnumProcessModules = CAST_TO_FN_PTR(
1234 BOOL(WINAPI *)(HANDLE, HMODULE *, DWORD, LPDWORD),
1235 GetProcAddress(psapi, "EnumProcessModules")) ;
1236 _GetModuleFileNameEx = CAST_TO_FN_PTR(
1237 DWORD (WINAPI *)(HANDLE, HMODULE, LPTSTR, DWORD),
1238 GetProcAddress(psapi, "GetModuleFileNameExA"));
1239 _GetModuleInformation = CAST_TO_FN_PTR(
1240 BOOL (WINAPI *)(HANDLE, HMODULE, LPMODULEINFO, DWORD),
1241 GetProcAddress(psapi, "GetModuleInformation"));
1243 _has_psapi = (_EnumProcessModules && _GetModuleFileNameEx && _GetModuleInformation);
1244 _psapi_init = true;
1245 return _has_psapi;
1246 }
1248 static bool _init_toolhelp() {
1249 HINSTANCE kernel32 = LoadLibrary("Kernel32.DLL") ;
1250 if (kernel32 == NULL) return false ;
1252 _CreateToolhelp32Snapshot = CAST_TO_FN_PTR(
1253 HANDLE(WINAPI *)(DWORD,DWORD),
1254 GetProcAddress(kernel32, "CreateToolhelp32Snapshot"));
1255 _Module32First = CAST_TO_FN_PTR(
1256 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1257 GetProcAddress(kernel32, "Module32First" ));
1258 _Module32Next = CAST_TO_FN_PTR(
1259 BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32),
1260 GetProcAddress(kernel32, "Module32Next" ));
1262 _has_toolhelp = (_CreateToolhelp32Snapshot && _Module32First && _Module32Next);
1263 return _has_toolhelp;
1264 }
1266 #ifdef _WIN64
1267 // Helper routine which returns true if address in
1268 // within the NTDLL address space.
1269 //
1270 static bool _addr_in_ntdll( address addr )
1271 {
1272 HMODULE hmod;
1273 MODULEINFO minfo;
1275 hmod = GetModuleHandle("NTDLL.DLL");
1276 if ( hmod == NULL ) return false;
1277 if ( !_GetModuleInformation( GetCurrentProcess(), hmod,
1278 &minfo, sizeof(MODULEINFO)) )
1279 return false;
1281 if ( (addr >= minfo.lpBaseOfDll) &&
1282 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1283 return true;
1284 else
1285 return false;
1286 }
1287 #endif
1290 // Enumerate all modules for a given process ID
1291 //
1292 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1293 // different API for doing this. We use PSAPI.DLL on NT based
1294 // Windows and ToolHelp on 95/98/Me.
1296 // Callback function that is called by enumerate_modules() on
1297 // every DLL module.
1298 // Input parameters:
1299 // int pid,
1300 // char* module_file_name,
1301 // address module_base_addr,
1302 // unsigned module_size,
1303 // void* param
1304 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1306 // enumerate_modules for Windows NT, using PSAPI
1307 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1308 {
1309 HANDLE hProcess ;
1311 # define MAX_NUM_MODULES 128
1312 HMODULE modules[MAX_NUM_MODULES];
1313 static char filename[ MAX_PATH ];
1314 int result = 0;
1316 if (!_has_psapi && (_psapi_init || !_init_psapi())) return 0;
1318 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1319 FALSE, pid ) ;
1320 if (hProcess == NULL) return 0;
1322 DWORD size_needed;
1323 if (!_EnumProcessModules(hProcess, modules,
1324 sizeof(modules), &size_needed)) {
1325 CloseHandle( hProcess );
1326 return 0;
1327 }
1329 // number of modules that are currently loaded
1330 int num_modules = size_needed / sizeof(HMODULE);
1332 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1333 // Get Full pathname:
1334 if(!_GetModuleFileNameEx(hProcess, modules[i],
1335 filename, sizeof(filename))) {
1336 filename[0] = '\0';
1337 }
1339 MODULEINFO modinfo;
1340 if (!_GetModuleInformation(hProcess, modules[i],
1341 &modinfo, sizeof(modinfo))) {
1342 modinfo.lpBaseOfDll = NULL;
1343 modinfo.SizeOfImage = 0;
1344 }
1346 // Invoke callback function
1347 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1348 modinfo.SizeOfImage, param);
1349 if (result) break;
1350 }
1352 CloseHandle( hProcess ) ;
1353 return result;
1354 }
1357 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1358 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1359 {
1360 HANDLE hSnapShot ;
1361 static MODULEENTRY32 modentry ;
1362 int result = 0;
1364 if (!_has_toolhelp) return 0;
1366 // Get a handle to a Toolhelp snapshot of the system
1367 hSnapShot = _CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1368 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1369 return FALSE ;
1370 }
1372 // iterate through all modules
1373 modentry.dwSize = sizeof(MODULEENTRY32) ;
1374 bool not_done = _Module32First( hSnapShot, &modentry ) != 0;
1376 while( not_done ) {
1377 // invoke the callback
1378 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1379 modentry.modBaseSize, param);
1380 if (result) break;
1382 modentry.dwSize = sizeof(MODULEENTRY32) ;
1383 not_done = _Module32Next( hSnapShot, &modentry ) != 0;
1384 }
1386 CloseHandle(hSnapShot);
1387 return result;
1388 }
1390 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1391 {
1392 // Get current process ID if caller doesn't provide it.
1393 if (!pid) pid = os::current_process_id();
1395 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1396 else return _enumerate_modules_windows(pid, func, param);
1397 }
1399 struct _modinfo {
1400 address addr;
1401 char* full_path; // point to a char buffer
1402 int buflen; // size of the buffer
1403 address base_addr;
1404 };
1406 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1407 unsigned size, void * param) {
1408 struct _modinfo *pmod = (struct _modinfo *)param;
1409 if (!pmod) return -1;
1411 if (base_addr <= pmod->addr &&
1412 base_addr+size > pmod->addr) {
1413 // if a buffer is provided, copy path name to the buffer
1414 if (pmod->full_path) {
1415 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1416 }
1417 pmod->base_addr = base_addr;
1418 return 1;
1419 }
1420 return 0;
1421 }
1423 bool os::dll_address_to_library_name(address addr, char* buf,
1424 int buflen, int* offset) {
1425 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1426 // return the full path to the DLL file, sometimes it returns path
1427 // to the corresponding PDB file (debug info); sometimes it only
1428 // returns partial path, which makes life painful.
1430 struct _modinfo mi;
1431 mi.addr = addr;
1432 mi.full_path = buf;
1433 mi.buflen = buflen;
1434 int pid = os::current_process_id();
1435 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1436 // buf already contains path name
1437 if (offset) *offset = addr - mi.base_addr;
1438 return true;
1439 } else {
1440 if (buf) buf[0] = '\0';
1441 if (offset) *offset = -1;
1442 return false;
1443 }
1444 }
1446 bool os::dll_address_to_function_name(address addr, char *buf,
1447 int buflen, int *offset) {
1448 if (Decoder::decode(addr, buf, buflen, offset) == Decoder::no_error) {
1449 return true;
1450 }
1451 if (offset != NULL) *offset = -1;
1452 if (buf != NULL) buf[0] = '\0';
1453 return false;
1454 }
1456 // save the start and end address of jvm.dll into param[0] and param[1]
1457 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1458 unsigned size, void * param) {
1459 if (!param) return -1;
1461 if (base_addr <= (address)_locate_jvm_dll &&
1462 base_addr+size > (address)_locate_jvm_dll) {
1463 ((address*)param)[0] = base_addr;
1464 ((address*)param)[1] = base_addr + size;
1465 return 1;
1466 }
1467 return 0;
1468 }
1470 address vm_lib_location[2]; // start and end address of jvm.dll
1472 // check if addr is inside jvm.dll
1473 bool os::address_is_in_vm(address addr) {
1474 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1475 int pid = os::current_process_id();
1476 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1477 assert(false, "Can't find jvm module.");
1478 return false;
1479 }
1480 }
1482 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1483 }
1485 // print module info; param is outputStream*
1486 static int _print_module(int pid, char* fname, address base,
1487 unsigned size, void* param) {
1488 if (!param) return -1;
1490 outputStream* st = (outputStream*)param;
1492 address end_addr = base + size;
1493 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1494 return 0;
1495 }
1497 // Loads .dll/.so and
1498 // in case of error it checks if .dll/.so was built for the
1499 // same architecture as Hotspot is running on
1500 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1501 {
1502 void * result = LoadLibrary(name);
1503 if (result != NULL)
1504 {
1505 return result;
1506 }
1508 long errcode = GetLastError();
1509 if (errcode == ERROR_MOD_NOT_FOUND) {
1510 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1511 ebuf[ebuflen-1]='\0';
1512 return NULL;
1513 }
1515 // Parsing dll below
1516 // If we can read dll-info and find that dll was built
1517 // for an architecture other than Hotspot is running in
1518 // - then print to buffer "DLL was built for a different architecture"
1519 // else call getLastErrorString to obtain system error message
1521 // Read system error message into ebuf
1522 // It may or may not be overwritten below (in the for loop and just above)
1523 getLastErrorString(ebuf, (size_t) ebuflen);
1524 ebuf[ebuflen-1]='\0';
1525 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1526 if (file_descriptor<0)
1527 {
1528 return NULL;
1529 }
1531 uint32_t signature_offset;
1532 uint16_t lib_arch=0;
1533 bool failed_to_get_lib_arch=
1534 (
1535 //Go to position 3c in the dll
1536 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1537 ||
1538 // Read loacation of signature
1539 (sizeof(signature_offset)!=
1540 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1541 ||
1542 //Go to COFF File Header in dll
1543 //that is located after"signature" (4 bytes long)
1544 (os::seek_to_file_offset(file_descriptor,
1545 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1546 ||
1547 //Read field that contains code of architecture
1548 // that dll was build for
1549 (sizeof(lib_arch)!=
1550 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1551 );
1553 ::close(file_descriptor);
1554 if (failed_to_get_lib_arch)
1555 {
1556 // file i/o error - report getLastErrorString(...) msg
1557 return NULL;
1558 }
1560 typedef struct
1561 {
1562 uint16_t arch_code;
1563 char* arch_name;
1564 } arch_t;
1566 static const arch_t arch_array[]={
1567 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1568 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1569 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1570 };
1571 #if (defined _M_IA64)
1572 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1573 #elif (defined _M_AMD64)
1574 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1575 #elif (defined _M_IX86)
1576 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1577 #else
1578 #error Method os::dll_load requires that one of following \
1579 is defined :_M_IA64,_M_AMD64 or _M_IX86
1580 #endif
1583 // Obtain a string for printf operation
1584 // lib_arch_str shall contain string what platform this .dll was built for
1585 // running_arch_str shall string contain what platform Hotspot was built for
1586 char *running_arch_str=NULL,*lib_arch_str=NULL;
1587 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1588 {
1589 if (lib_arch==arch_array[i].arch_code)
1590 lib_arch_str=arch_array[i].arch_name;
1591 if (running_arch==arch_array[i].arch_code)
1592 running_arch_str=arch_array[i].arch_name;
1593 }
1595 assert(running_arch_str,
1596 "Didn't find runing architecture code in arch_array");
1598 // If the architure is right
1599 // but some other error took place - report getLastErrorString(...) msg
1600 if (lib_arch == running_arch)
1601 {
1602 return NULL;
1603 }
1605 if (lib_arch_str!=NULL)
1606 {
1607 ::_snprintf(ebuf, ebuflen-1,
1608 "Can't load %s-bit .dll on a %s-bit platform",
1609 lib_arch_str,running_arch_str);
1610 }
1611 else
1612 {
1613 // don't know what architecture this dll was build for
1614 ::_snprintf(ebuf, ebuflen-1,
1615 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1616 lib_arch,running_arch_str);
1617 }
1619 return NULL;
1620 }
1623 void os::print_dll_info(outputStream *st) {
1624 int pid = os::current_process_id();
1625 st->print_cr("Dynamic libraries:");
1626 enumerate_modules(pid, _print_module, (void *)st);
1627 }
1629 // function pointer to Windows API "GetNativeSystemInfo".
1630 typedef void (WINAPI *GetNativeSystemInfo_func_type)(LPSYSTEM_INFO);
1631 static GetNativeSystemInfo_func_type _GetNativeSystemInfo;
1633 void os::print_os_info(outputStream* st) {
1634 st->print("OS:");
1636 OSVERSIONINFOEX osvi;
1637 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1638 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1640 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1641 st->print_cr("N/A");
1642 return;
1643 }
1645 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1646 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1647 switch (os_vers) {
1648 case 3051: st->print(" Windows NT 3.51"); break;
1649 case 4000: st->print(" Windows NT 4.0"); break;
1650 case 5000: st->print(" Windows 2000"); break;
1651 case 5001: st->print(" Windows XP"); break;
1652 case 5002:
1653 case 6000:
1654 case 6001: {
1655 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1656 // find out whether we are running on 64 bit processor or not.
1657 SYSTEM_INFO si;
1658 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1659 // Check to see if _GetNativeSystemInfo has been initialized.
1660 if (_GetNativeSystemInfo == NULL) {
1661 HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32.dll"));
1662 _GetNativeSystemInfo =
1663 CAST_TO_FN_PTR(GetNativeSystemInfo_func_type,
1664 GetProcAddress(hKernel32,
1665 "GetNativeSystemInfo"));
1666 if (_GetNativeSystemInfo == NULL)
1667 GetSystemInfo(&si);
1668 } else {
1669 _GetNativeSystemInfo(&si);
1670 }
1671 if (os_vers == 5002) {
1672 if (osvi.wProductType == VER_NT_WORKSTATION &&
1673 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1674 st->print(" Windows XP x64 Edition");
1675 else
1676 st->print(" Windows Server 2003 family");
1677 } else if (os_vers == 6000) {
1678 if (osvi.wProductType == VER_NT_WORKSTATION)
1679 st->print(" Windows Vista");
1680 else
1681 st->print(" Windows Server 2008");
1682 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1683 st->print(" , 64 bit");
1684 } else if (os_vers == 6001) {
1685 if (osvi.wProductType == VER_NT_WORKSTATION) {
1686 st->print(" Windows 7");
1687 } else {
1688 // Unrecognized windows, print out its major and minor versions
1689 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1690 }
1691 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1692 st->print(" , 64 bit");
1693 } else { // future os
1694 // Unrecognized windows, print out its major and minor versions
1695 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1696 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1697 st->print(" , 64 bit");
1698 }
1699 break;
1700 }
1701 default: // future windows, print out its major and minor versions
1702 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1703 }
1704 } else {
1705 switch (os_vers) {
1706 case 4000: st->print(" Windows 95"); break;
1707 case 4010: st->print(" Windows 98"); break;
1708 case 4090: st->print(" Windows Me"); break;
1709 default: // future windows, print out its major and minor versions
1710 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1711 }
1712 }
1713 st->print(" Build %d", osvi.dwBuildNumber);
1714 st->print(" %s", osvi.szCSDVersion); // service pack
1715 st->cr();
1716 }
1718 void os::print_memory_info(outputStream* st) {
1719 st->print("Memory:");
1720 st->print(" %dk page", os::vm_page_size()>>10);
1722 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1723 // value if total memory is larger than 4GB
1724 MEMORYSTATUSEX ms;
1725 ms.dwLength = sizeof(ms);
1726 GlobalMemoryStatusEx(&ms);
1728 st->print(", physical %uk", os::physical_memory() >> 10);
1729 st->print("(%uk free)", os::available_memory() >> 10);
1731 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1732 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1733 st->cr();
1734 }
1736 void os::print_siginfo(outputStream *st, void *siginfo) {
1737 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1738 st->print("siginfo:");
1739 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1741 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1742 er->NumberParameters >= 2) {
1743 switch (er->ExceptionInformation[0]) {
1744 case 0: st->print(", reading address"); break;
1745 case 1: st->print(", writing address"); break;
1746 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1747 er->ExceptionInformation[0]);
1748 }
1749 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1750 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1751 er->NumberParameters >= 2 && UseSharedSpaces) {
1752 FileMapInfo* mapinfo = FileMapInfo::current_info();
1753 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1754 st->print("\n\nError accessing class data sharing archive." \
1755 " Mapped file inaccessible during execution, " \
1756 " possible disk/network problem.");
1757 }
1758 } else {
1759 int num = er->NumberParameters;
1760 if (num > 0) {
1761 st->print(", ExceptionInformation=");
1762 for (int i = 0; i < num; i++) {
1763 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1764 }
1765 }
1766 }
1767 st->cr();
1768 }
1770 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1771 // do nothing
1772 }
1774 static char saved_jvm_path[MAX_PATH] = {0};
1776 // Find the full path to the current module, jvm.dll or jvm_g.dll
1777 void os::jvm_path(char *buf, jint buflen) {
1778 // Error checking.
1779 if (buflen < MAX_PATH) {
1780 assert(false, "must use a large-enough buffer");
1781 buf[0] = '\0';
1782 return;
1783 }
1784 // Lazy resolve the path to current module.
1785 if (saved_jvm_path[0] != 0) {
1786 strcpy(buf, saved_jvm_path);
1787 return;
1788 }
1790 buf[0] = '\0';
1791 if (Arguments::created_by_gamma_launcher()) {
1792 // Support for the gamma launcher. Check for an
1793 // JAVA_HOME environment variable
1794 // and fix up the path so it looks like
1795 // libjvm.so is installed there (append a fake suffix
1796 // hotspot/libjvm.so).
1797 char* java_home_var = ::getenv("JAVA_HOME");
1798 if (java_home_var != NULL && java_home_var[0] != 0) {
1800 strncpy(buf, java_home_var, buflen);
1802 // determine if this is a legacy image or modules image
1803 // modules image doesn't have "jre" subdirectory
1804 size_t len = strlen(buf);
1805 char* jrebin_p = buf + len;
1806 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1807 if (0 != _access(buf, 0)) {
1808 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1809 }
1810 len = strlen(buf);
1811 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1812 }
1813 }
1815 if(buf[0] == '\0') {
1816 GetModuleFileName(vm_lib_handle, buf, buflen);
1817 }
1818 strcpy(saved_jvm_path, buf);
1819 }
1822 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1823 #ifndef _WIN64
1824 st->print("_");
1825 #endif
1826 }
1829 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1830 #ifndef _WIN64
1831 st->print("@%d", args_size * sizeof(int));
1832 #endif
1833 }
1835 // This method is a copy of JDK's sysGetLastErrorString
1836 // from src/windows/hpi/src/system_md.c
1838 size_t os::lasterror(char *buf, size_t len) {
1839 long errval;
1841 if ((errval = GetLastError()) != 0) {
1842 /* DOS error */
1843 int n = (int)FormatMessage(
1844 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1845 NULL,
1846 errval,
1847 0,
1848 buf,
1849 (DWORD)len,
1850 NULL);
1851 if (n > 3) {
1852 /* Drop final '.', CR, LF */
1853 if (buf[n - 1] == '\n') n--;
1854 if (buf[n - 1] == '\r') n--;
1855 if (buf[n - 1] == '.') n--;
1856 buf[n] = '\0';
1857 }
1858 return n;
1859 }
1861 if (errno != 0) {
1862 /* C runtime error that has no corresponding DOS error code */
1863 const char *s = strerror(errno);
1864 size_t n = strlen(s);
1865 if (n >= len) n = len - 1;
1866 strncpy(buf, s, n);
1867 buf[n] = '\0';
1868 return n;
1869 }
1870 return 0;
1871 }
1873 // sun.misc.Signal
1874 // NOTE that this is a workaround for an apparent kernel bug where if
1875 // a signal handler for SIGBREAK is installed then that signal handler
1876 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1877 // See bug 4416763.
1878 static void (*sigbreakHandler)(int) = NULL;
1880 static void UserHandler(int sig, void *siginfo, void *context) {
1881 os::signal_notify(sig);
1882 // We need to reinstate the signal handler each time...
1883 os::signal(sig, (void*)UserHandler);
1884 }
1886 void* os::user_handler() {
1887 return (void*) UserHandler;
1888 }
1890 void* os::signal(int signal_number, void* handler) {
1891 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1892 void (*oldHandler)(int) = sigbreakHandler;
1893 sigbreakHandler = (void (*)(int)) handler;
1894 return (void*) oldHandler;
1895 } else {
1896 return (void*)::signal(signal_number, (void (*)(int))handler);
1897 }
1898 }
1900 void os::signal_raise(int signal_number) {
1901 raise(signal_number);
1902 }
1904 // The Win32 C runtime library maps all console control events other than ^C
1905 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1906 // logoff, and shutdown events. We therefore install our own console handler
1907 // that raises SIGTERM for the latter cases.
1908 //
1909 static BOOL WINAPI consoleHandler(DWORD event) {
1910 switch(event) {
1911 case CTRL_C_EVENT:
1912 if (is_error_reported()) {
1913 // Ctrl-C is pressed during error reporting, likely because the error
1914 // handler fails to abort. Let VM die immediately.
1915 os::die();
1916 }
1918 os::signal_raise(SIGINT);
1919 return TRUE;
1920 break;
1921 case CTRL_BREAK_EVENT:
1922 if (sigbreakHandler != NULL) {
1923 (*sigbreakHandler)(SIGBREAK);
1924 }
1925 return TRUE;
1926 break;
1927 case CTRL_CLOSE_EVENT:
1928 case CTRL_LOGOFF_EVENT:
1929 case CTRL_SHUTDOWN_EVENT:
1930 os::signal_raise(SIGTERM);
1931 return TRUE;
1932 break;
1933 default:
1934 break;
1935 }
1936 return FALSE;
1937 }
1939 /*
1940 * The following code is moved from os.cpp for making this
1941 * code platform specific, which it is by its very nature.
1942 */
1944 // Return maximum OS signal used + 1 for internal use only
1945 // Used as exit signal for signal_thread
1946 int os::sigexitnum_pd(){
1947 return NSIG;
1948 }
1950 // a counter for each possible signal value, including signal_thread exit signal
1951 static volatile jint pending_signals[NSIG+1] = { 0 };
1952 static HANDLE sig_sem;
1954 void os::signal_init_pd() {
1955 // Initialize signal structures
1956 memset((void*)pending_signals, 0, sizeof(pending_signals));
1958 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1960 // Programs embedding the VM do not want it to attempt to receive
1961 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1962 // shutdown hooks mechanism introduced in 1.3. For example, when
1963 // the VM is run as part of a Windows NT service (i.e., a servlet
1964 // engine in a web server), the correct behavior is for any console
1965 // control handler to return FALSE, not TRUE, because the OS's
1966 // "final" handler for such events allows the process to continue if
1967 // it is a service (while terminating it if it is not a service).
1968 // To make this behavior uniform and the mechanism simpler, we
1969 // completely disable the VM's usage of these console events if -Xrs
1970 // (=ReduceSignalUsage) is specified. This means, for example, that
1971 // the CTRL-BREAK thread dump mechanism is also disabled in this
1972 // case. See bugs 4323062, 4345157, and related bugs.
1974 if (!ReduceSignalUsage) {
1975 // Add a CTRL-C handler
1976 SetConsoleCtrlHandler(consoleHandler, TRUE);
1977 }
1978 }
1980 void os::signal_notify(int signal_number) {
1981 BOOL ret;
1983 Atomic::inc(&pending_signals[signal_number]);
1984 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1985 assert(ret != 0, "ReleaseSemaphore() failed");
1986 }
1988 static int check_pending_signals(bool wait_for_signal) {
1989 DWORD ret;
1990 while (true) {
1991 for (int i = 0; i < NSIG + 1; i++) {
1992 jint n = pending_signals[i];
1993 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1994 return i;
1995 }
1996 }
1997 if (!wait_for_signal) {
1998 return -1;
1999 }
2001 JavaThread *thread = JavaThread::current();
2003 ThreadBlockInVM tbivm(thread);
2005 bool threadIsSuspended;
2006 do {
2007 thread->set_suspend_equivalent();
2008 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2009 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2010 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2012 // were we externally suspended while we were waiting?
2013 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2014 if (threadIsSuspended) {
2015 //
2016 // The semaphore has been incremented, but while we were waiting
2017 // another thread suspended us. We don't want to continue running
2018 // while suspended because that would surprise the thread that
2019 // suspended us.
2020 //
2021 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2022 assert(ret != 0, "ReleaseSemaphore() failed");
2024 thread->java_suspend_self();
2025 }
2026 } while (threadIsSuspended);
2027 }
2028 }
2030 int os::signal_lookup() {
2031 return check_pending_signals(false);
2032 }
2034 int os::signal_wait() {
2035 return check_pending_signals(true);
2036 }
2038 // Implicit OS exception handling
2040 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2041 JavaThread* thread = JavaThread::current();
2042 // Save pc in thread
2043 #ifdef _M_IA64
2044 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
2045 // Set pc to handler
2046 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2047 #elif _M_AMD64
2048 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
2049 // Set pc to handler
2050 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2051 #else
2052 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
2053 // Set pc to handler
2054 exceptionInfo->ContextRecord->Eip = (LONG)handler;
2055 #endif
2057 // Continue the execution
2058 return EXCEPTION_CONTINUE_EXECUTION;
2059 }
2062 // Used for PostMortemDump
2063 extern "C" void safepoints();
2064 extern "C" void find(int x);
2065 extern "C" void events();
2067 // According to Windows API documentation, an illegal instruction sequence should generate
2068 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2069 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2070 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2072 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2074 // From "Execution Protection in the Windows Operating System" draft 0.35
2075 // Once a system header becomes available, the "real" define should be
2076 // included or copied here.
2077 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2079 #define def_excpt(val) #val, val
2081 struct siglabel {
2082 char *name;
2083 int number;
2084 };
2086 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2087 // C++ compiler contain this error code. Because this is a compiler-generated
2088 // error, the code is not listed in the Win32 API header files.
2089 // The code is actually a cryptic mnemonic device, with the initial "E"
2090 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2091 // ASCII values of "msc".
2093 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2096 struct siglabel exceptlabels[] = {
2097 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2098 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2099 def_excpt(EXCEPTION_BREAKPOINT),
2100 def_excpt(EXCEPTION_SINGLE_STEP),
2101 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2102 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2103 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2104 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2105 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2106 def_excpt(EXCEPTION_FLT_OVERFLOW),
2107 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2108 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2109 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2110 def_excpt(EXCEPTION_INT_OVERFLOW),
2111 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2112 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2113 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2114 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2115 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2116 def_excpt(EXCEPTION_STACK_OVERFLOW),
2117 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2118 def_excpt(EXCEPTION_GUARD_PAGE),
2119 def_excpt(EXCEPTION_INVALID_HANDLE),
2120 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2121 NULL, 0
2122 };
2124 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2125 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2126 if (exceptlabels[i].number == exception_code) {
2127 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2128 return buf;
2129 }
2130 }
2132 return NULL;
2133 }
2135 //-----------------------------------------------------------------------------
2136 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2137 // handle exception caused by idiv; should only happen for -MinInt/-1
2138 // (division by zero is handled explicitly)
2139 #ifdef _M_IA64
2140 assert(0, "Fix Handle_IDiv_Exception");
2141 #elif _M_AMD64
2142 PCONTEXT ctx = exceptionInfo->ContextRecord;
2143 address pc = (address)ctx->Rip;
2144 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
2145 assert(pc[0] == 0xF7, "not an idiv opcode");
2146 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2147 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2148 // set correct result values and continue after idiv instruction
2149 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2150 ctx->Rax = (DWORD)min_jint; // result
2151 ctx->Rdx = (DWORD)0; // remainder
2152 // Continue the execution
2153 #else
2154 PCONTEXT ctx = exceptionInfo->ContextRecord;
2155 address pc = (address)ctx->Eip;
2156 NOT_PRODUCT(Events::log("idiv overflow exception at " INTPTR_FORMAT , pc));
2157 assert(pc[0] == 0xF7, "not an idiv opcode");
2158 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2159 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2160 // set correct result values and continue after idiv instruction
2161 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2162 ctx->Eax = (DWORD)min_jint; // result
2163 ctx->Edx = (DWORD)0; // remainder
2164 // Continue the execution
2165 #endif
2166 return EXCEPTION_CONTINUE_EXECUTION;
2167 }
2169 #ifndef _WIN64
2170 //-----------------------------------------------------------------------------
2171 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2172 // handle exception caused by native method modifying control word
2173 PCONTEXT ctx = exceptionInfo->ContextRecord;
2174 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2176 switch (exception_code) {
2177 case EXCEPTION_FLT_DENORMAL_OPERAND:
2178 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2179 case EXCEPTION_FLT_INEXACT_RESULT:
2180 case EXCEPTION_FLT_INVALID_OPERATION:
2181 case EXCEPTION_FLT_OVERFLOW:
2182 case EXCEPTION_FLT_STACK_CHECK:
2183 case EXCEPTION_FLT_UNDERFLOW:
2184 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2185 if (fp_control_word != ctx->FloatSave.ControlWord) {
2186 // Restore FPCW and mask out FLT exceptions
2187 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2188 // Mask out pending FLT exceptions
2189 ctx->FloatSave.StatusWord &= 0xffffff00;
2190 return EXCEPTION_CONTINUE_EXECUTION;
2191 }
2192 }
2194 if (prev_uef_handler != NULL) {
2195 // We didn't handle this exception so pass it to the previous
2196 // UnhandledExceptionFilter.
2197 return (prev_uef_handler)(exceptionInfo);
2198 }
2200 return EXCEPTION_CONTINUE_SEARCH;
2201 }
2202 #else //_WIN64
2203 /*
2204 On Windows, the mxcsr control bits are non-volatile across calls
2205 See also CR 6192333
2206 If EXCEPTION_FLT_* happened after some native method modified
2207 mxcsr - it is not a jvm fault.
2208 However should we decide to restore of mxcsr after a faulty
2209 native method we can uncomment following code
2210 jint MxCsr = INITIAL_MXCSR;
2211 // we can't use StubRoutines::addr_mxcsr_std()
2212 // because in Win64 mxcsr is not saved there
2213 if (MxCsr != ctx->MxCsr) {
2214 ctx->MxCsr = MxCsr;
2215 return EXCEPTION_CONTINUE_EXECUTION;
2216 }
2218 */
2219 #endif //_WIN64
2222 // Fatal error reporting is single threaded so we can make this a
2223 // static and preallocated. If it's more than MAX_PATH silently ignore
2224 // it.
2225 static char saved_error_file[MAX_PATH] = {0};
2227 void os::set_error_file(const char *logfile) {
2228 if (strlen(logfile) <= MAX_PATH) {
2229 strncpy(saved_error_file, logfile, MAX_PATH);
2230 }
2231 }
2233 static inline void report_error(Thread* t, DWORD exception_code,
2234 address addr, void* siginfo, void* context) {
2235 VMError err(t, exception_code, addr, siginfo, context);
2236 err.report_and_die();
2238 // If UseOsErrorReporting, this will return here and save the error file
2239 // somewhere where we can find it in the minidump.
2240 }
2242 //-----------------------------------------------------------------------------
2243 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2244 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2245 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2246 #ifdef _M_IA64
2247 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2248 #elif _M_AMD64
2249 address pc = (address) exceptionInfo->ContextRecord->Rip;
2250 #else
2251 address pc = (address) exceptionInfo->ContextRecord->Eip;
2252 #endif
2253 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2255 #ifndef _WIN64
2256 // Execution protection violation - win32 running on AMD64 only
2257 // Handled first to avoid misdiagnosis as a "normal" access violation;
2258 // This is safe to do because we have a new/unique ExceptionInformation
2259 // code for this condition.
2260 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2261 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2262 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2263 address addr = (address) exceptionRecord->ExceptionInformation[1];
2265 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2266 int page_size = os::vm_page_size();
2268 // Make sure the pc and the faulting address are sane.
2269 //
2270 // If an instruction spans a page boundary, and the page containing
2271 // the beginning of the instruction is executable but the following
2272 // page is not, the pc and the faulting address might be slightly
2273 // different - we still want to unguard the 2nd page in this case.
2274 //
2275 // 15 bytes seems to be a (very) safe value for max instruction size.
2276 bool pc_is_near_addr =
2277 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2278 bool instr_spans_page_boundary =
2279 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2280 (intptr_t) page_size) > 0);
2282 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2283 static volatile address last_addr =
2284 (address) os::non_memory_address_word();
2286 // In conservative mode, don't unguard unless the address is in the VM
2287 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2288 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2290 // Set memory to RWX and retry
2291 address page_start =
2292 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2293 bool res = os::protect_memory((char*) page_start, page_size,
2294 os::MEM_PROT_RWX);
2296 if (PrintMiscellaneous && Verbose) {
2297 char buf[256];
2298 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2299 "at " INTPTR_FORMAT
2300 ", unguarding " INTPTR_FORMAT ": %s", addr,
2301 page_start, (res ? "success" : strerror(errno)));
2302 tty->print_raw_cr(buf);
2303 }
2305 // Set last_addr so if we fault again at the same address, we don't
2306 // end up in an endless loop.
2307 //
2308 // There are two potential complications here. Two threads trapping
2309 // at the same address at the same time could cause one of the
2310 // threads to think it already unguarded, and abort the VM. Likely
2311 // very rare.
2312 //
2313 // The other race involves two threads alternately trapping at
2314 // different addresses and failing to unguard the page, resulting in
2315 // an endless loop. This condition is probably even more unlikely
2316 // than the first.
2317 //
2318 // Although both cases could be avoided by using locks or thread
2319 // local last_addr, these solutions are unnecessary complication:
2320 // this handler is a best-effort safety net, not a complete solution.
2321 // It is disabled by default and should only be used as a workaround
2322 // in case we missed any no-execute-unsafe VM code.
2324 last_addr = addr;
2326 return EXCEPTION_CONTINUE_EXECUTION;
2327 }
2328 }
2330 // Last unguard failed or not unguarding
2331 tty->print_raw_cr("Execution protection violation");
2332 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2333 exceptionInfo->ContextRecord);
2334 return EXCEPTION_CONTINUE_SEARCH;
2335 }
2336 }
2337 #endif // _WIN64
2339 // Check to see if we caught the safepoint code in the
2340 // process of write protecting the memory serialization page.
2341 // It write enables the page immediately after protecting it
2342 // so just return.
2343 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2344 JavaThread* thread = (JavaThread*) t;
2345 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2346 address addr = (address) exceptionRecord->ExceptionInformation[1];
2347 if ( os::is_memory_serialize_page(thread, addr) ) {
2348 // Block current thread until the memory serialize page permission restored.
2349 os::block_on_serialize_page_trap();
2350 return EXCEPTION_CONTINUE_EXECUTION;
2351 }
2352 }
2354 if (t != NULL && t->is_Java_thread()) {
2355 JavaThread* thread = (JavaThread*) t;
2356 bool in_java = thread->thread_state() == _thread_in_Java;
2358 // Handle potential stack overflows up front.
2359 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2360 if (os::uses_stack_guard_pages()) {
2361 #ifdef _M_IA64
2362 //
2363 // If it's a legal stack address continue, Windows will map it in.
2364 //
2365 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2366 address addr = (address) exceptionRecord->ExceptionInformation[1];
2367 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2368 return EXCEPTION_CONTINUE_EXECUTION;
2370 // The register save area is the same size as the memory stack
2371 // and starts at the page just above the start of the memory stack.
2372 // If we get a fault in this area, we've run out of register
2373 // stack. If we are in java, try throwing a stack overflow exception.
2374 if (addr > thread->stack_base() &&
2375 addr <= (thread->stack_base()+thread->stack_size()) ) {
2376 char buf[256];
2377 jio_snprintf(buf, sizeof(buf),
2378 "Register stack overflow, addr:%p, stack_base:%p\n",
2379 addr, thread->stack_base() );
2380 tty->print_raw_cr(buf);
2381 // If not in java code, return and hope for the best.
2382 return in_java ? Handle_Exception(exceptionInfo,
2383 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2384 : EXCEPTION_CONTINUE_EXECUTION;
2385 }
2386 #endif
2387 if (thread->stack_yellow_zone_enabled()) {
2388 // Yellow zone violation. The o/s has unprotected the first yellow
2389 // zone page for us. Note: must call disable_stack_yellow_zone to
2390 // update the enabled status, even if the zone contains only one page.
2391 thread->disable_stack_yellow_zone();
2392 // If not in java code, return and hope for the best.
2393 return in_java ? Handle_Exception(exceptionInfo,
2394 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2395 : EXCEPTION_CONTINUE_EXECUTION;
2396 } else {
2397 // Fatal red zone violation.
2398 thread->disable_stack_red_zone();
2399 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2400 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2401 exceptionInfo->ContextRecord);
2402 return EXCEPTION_CONTINUE_SEARCH;
2403 }
2404 } else if (in_java) {
2405 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2406 // a one-time-only guard page, which it has released to us. The next
2407 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2408 return Handle_Exception(exceptionInfo,
2409 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2410 } else {
2411 // Can only return and hope for the best. Further stack growth will
2412 // result in an ACCESS_VIOLATION.
2413 return EXCEPTION_CONTINUE_EXECUTION;
2414 }
2415 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2416 // Either stack overflow or null pointer exception.
2417 if (in_java) {
2418 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2419 address addr = (address) exceptionRecord->ExceptionInformation[1];
2420 address stack_end = thread->stack_base() - thread->stack_size();
2421 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2422 // Stack overflow.
2423 assert(!os::uses_stack_guard_pages(),
2424 "should be caught by red zone code above.");
2425 return Handle_Exception(exceptionInfo,
2426 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2427 }
2428 //
2429 // Check for safepoint polling and implicit null
2430 // We only expect null pointers in the stubs (vtable)
2431 // the rest are checked explicitly now.
2432 //
2433 CodeBlob* cb = CodeCache::find_blob(pc);
2434 if (cb != NULL) {
2435 if (os::is_poll_address(addr)) {
2436 address stub = SharedRuntime::get_poll_stub(pc);
2437 return Handle_Exception(exceptionInfo, stub);
2438 }
2439 }
2440 {
2441 #ifdef _WIN64
2442 //
2443 // If it's a legal stack address map the entire region in
2444 //
2445 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2446 address addr = (address) exceptionRecord->ExceptionInformation[1];
2447 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2448 addr = (address)((uintptr_t)addr &
2449 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2450 os::commit_memory((char *)addr, thread->stack_base() - addr,
2451 false );
2452 return EXCEPTION_CONTINUE_EXECUTION;
2453 }
2454 else
2455 #endif
2456 {
2457 // Null pointer exception.
2458 #ifdef _M_IA64
2459 // We catch register stack overflows in compiled code by doing
2460 // an explicit compare and executing a st8(G0, G0) if the
2461 // BSP enters into our guard area. We test for the overflow
2462 // condition and fall into the normal null pointer exception
2463 // code if BSP hasn't overflowed.
2464 if ( in_java ) {
2465 if(thread->register_stack_overflow()) {
2466 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2467 thread->register_stack_limit(),
2468 "GR7 doesn't contain register_stack_limit");
2469 // Disable the yellow zone which sets the state that
2470 // we've got a stack overflow problem.
2471 if (thread->stack_yellow_zone_enabled()) {
2472 thread->disable_stack_yellow_zone();
2473 }
2474 // Give us some room to process the exception
2475 thread->disable_register_stack_guard();
2476 // Update GR7 with the new limit so we can continue running
2477 // compiled code.
2478 exceptionInfo->ContextRecord->IntS3 =
2479 (ULONGLONG)thread->register_stack_limit();
2480 return Handle_Exception(exceptionInfo,
2481 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2482 } else {
2483 //
2484 // Check for implicit null
2485 // We only expect null pointers in the stubs (vtable)
2486 // the rest are checked explicitly now.
2487 //
2488 if (((uintptr_t)addr) < os::vm_page_size() ) {
2489 // an access to the first page of VM--assume it is a null pointer
2490 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2491 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2492 }
2493 }
2494 } // in_java
2496 // IA64 doesn't use implicit null checking yet. So we shouldn't
2497 // get here.
2498 tty->print_raw_cr("Access violation, possible null pointer exception");
2499 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2500 exceptionInfo->ContextRecord);
2501 return EXCEPTION_CONTINUE_SEARCH;
2502 #else /* !IA64 */
2504 // Windows 98 reports faulting addresses incorrectly
2505 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2506 !os::win32::is_nt()) {
2507 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2508 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2509 }
2510 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2511 exceptionInfo->ContextRecord);
2512 return EXCEPTION_CONTINUE_SEARCH;
2513 #endif
2514 }
2515 }
2516 }
2518 #ifdef _WIN64
2519 // Special care for fast JNI field accessors.
2520 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2521 // in and the heap gets shrunk before the field access.
2522 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2523 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2524 if (addr != (address)-1) {
2525 return Handle_Exception(exceptionInfo, addr);
2526 }
2527 }
2528 #endif
2530 #ifdef _WIN64
2531 // Windows will sometimes generate an access violation
2532 // when we call malloc. Since we use VectoredExceptions
2533 // on 64 bit platforms, we see this exception. We must
2534 // pass this exception on so Windows can recover.
2535 // We check to see if the pc of the fault is in NTDLL.DLL
2536 // if so, we pass control on to Windows for handling.
2537 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2538 #endif
2540 // Stack overflow or null pointer exception in native code.
2541 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2542 exceptionInfo->ContextRecord);
2543 return EXCEPTION_CONTINUE_SEARCH;
2544 }
2546 if (in_java) {
2547 switch (exception_code) {
2548 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2549 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2551 case EXCEPTION_INT_OVERFLOW:
2552 return Handle_IDiv_Exception(exceptionInfo);
2554 } // switch
2555 }
2556 #ifndef _WIN64
2557 if (((thread->thread_state() == _thread_in_Java) ||
2558 (thread->thread_state() == _thread_in_native)) &&
2559 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2560 {
2561 LONG result=Handle_FLT_Exception(exceptionInfo);
2562 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2563 }
2564 #endif //_WIN64
2565 }
2567 if (exception_code != EXCEPTION_BREAKPOINT) {
2568 #ifndef _WIN64
2569 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2570 exceptionInfo->ContextRecord);
2571 #else
2572 // Itanium Windows uses a VectoredExceptionHandler
2573 // Which means that C++ programatic exception handlers (try/except)
2574 // will get here. Continue the search for the right except block if
2575 // the exception code is not a fatal code.
2576 switch ( exception_code ) {
2577 case EXCEPTION_ACCESS_VIOLATION:
2578 case EXCEPTION_STACK_OVERFLOW:
2579 case EXCEPTION_ILLEGAL_INSTRUCTION:
2580 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2581 case EXCEPTION_INT_OVERFLOW:
2582 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2583 case EXCEPTION_UNCAUGHT_CXX_EXCEPTION:
2584 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2585 exceptionInfo->ContextRecord);
2586 }
2587 break;
2588 default:
2589 break;
2590 }
2591 #endif
2592 }
2593 return EXCEPTION_CONTINUE_SEARCH;
2594 }
2596 #ifndef _WIN64
2597 // Special care for fast JNI accessors.
2598 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2599 // the heap gets shrunk before the field access.
2600 // Need to install our own structured exception handler since native code may
2601 // install its own.
2602 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2603 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2604 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2605 address pc = (address) exceptionInfo->ContextRecord->Eip;
2606 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2607 if (addr != (address)-1) {
2608 return Handle_Exception(exceptionInfo, addr);
2609 }
2610 }
2611 return EXCEPTION_CONTINUE_SEARCH;
2612 }
2614 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2615 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2616 __try { \
2617 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2618 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2619 } \
2620 return 0; \
2621 }
2623 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2624 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2625 DEFINE_FAST_GETFIELD(jchar, char, Char)
2626 DEFINE_FAST_GETFIELD(jshort, short, Short)
2627 DEFINE_FAST_GETFIELD(jint, int, Int)
2628 DEFINE_FAST_GETFIELD(jlong, long, Long)
2629 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2630 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2632 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2633 switch (type) {
2634 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2635 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2636 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2637 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2638 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2639 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2640 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2641 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2642 default: ShouldNotReachHere();
2643 }
2644 return (address)-1;
2645 }
2646 #endif
2648 // Virtual Memory
2650 int os::vm_page_size() { return os::win32::vm_page_size(); }
2651 int os::vm_allocation_granularity() {
2652 return os::win32::vm_allocation_granularity();
2653 }
2655 // Windows large page support is available on Windows 2003. In order to use
2656 // large page memory, the administrator must first assign additional privilege
2657 // to the user:
2658 // + select Control Panel -> Administrative Tools -> Local Security Policy
2659 // + select Local Policies -> User Rights Assignment
2660 // + double click "Lock pages in memory", add users and/or groups
2661 // + reboot
2662 // Note the above steps are needed for administrator as well, as administrators
2663 // by default do not have the privilege to lock pages in memory.
2664 //
2665 // Note about Windows 2003: although the API supports committing large page
2666 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2667 // scenario, I found through experiment it only uses large page if the entire
2668 // memory region is reserved and committed in a single VirtualAlloc() call.
2669 // This makes Windows large page support more or less like Solaris ISM, in
2670 // that the entire heap must be committed upfront. This probably will change
2671 // in the future, if so the code below needs to be revisited.
2673 #ifndef MEM_LARGE_PAGES
2674 #define MEM_LARGE_PAGES 0x20000000
2675 #endif
2677 // GetLargePageMinimum is only available on Windows 2003. The other functions
2678 // are available on NT but not on Windows 98/Me. We have to resolve them at
2679 // runtime.
2680 typedef SIZE_T (WINAPI *GetLargePageMinimum_func_type) (void);
2681 typedef BOOL (WINAPI *AdjustTokenPrivileges_func_type)
2682 (HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
2683 typedef BOOL (WINAPI *OpenProcessToken_func_type) (HANDLE, DWORD, PHANDLE);
2684 typedef BOOL (WINAPI *LookupPrivilegeValue_func_type) (LPCTSTR, LPCTSTR, PLUID);
2686 static GetLargePageMinimum_func_type _GetLargePageMinimum;
2687 static AdjustTokenPrivileges_func_type _AdjustTokenPrivileges;
2688 static OpenProcessToken_func_type _OpenProcessToken;
2689 static LookupPrivilegeValue_func_type _LookupPrivilegeValue;
2691 static HINSTANCE _kernel32;
2692 static HINSTANCE _advapi32;
2693 static HANDLE _hProcess;
2694 static HANDLE _hToken;
2696 static size_t _large_page_size = 0;
2698 static bool resolve_functions_for_large_page_init() {
2699 _kernel32 = LoadLibrary("kernel32.dll");
2700 if (_kernel32 == NULL) return false;
2702 _GetLargePageMinimum = CAST_TO_FN_PTR(GetLargePageMinimum_func_type,
2703 GetProcAddress(_kernel32, "GetLargePageMinimum"));
2704 if (_GetLargePageMinimum == NULL) return false;
2706 _advapi32 = LoadLibrary("advapi32.dll");
2707 if (_advapi32 == NULL) return false;
2709 _AdjustTokenPrivileges = CAST_TO_FN_PTR(AdjustTokenPrivileges_func_type,
2710 GetProcAddress(_advapi32, "AdjustTokenPrivileges"));
2711 _OpenProcessToken = CAST_TO_FN_PTR(OpenProcessToken_func_type,
2712 GetProcAddress(_advapi32, "OpenProcessToken"));
2713 _LookupPrivilegeValue = CAST_TO_FN_PTR(LookupPrivilegeValue_func_type,
2714 GetProcAddress(_advapi32, "LookupPrivilegeValueA"));
2715 return _AdjustTokenPrivileges != NULL &&
2716 _OpenProcessToken != NULL &&
2717 _LookupPrivilegeValue != NULL;
2718 }
2720 static bool request_lock_memory_privilege() {
2721 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2722 os::current_process_id());
2724 LUID luid;
2725 if (_hProcess != NULL &&
2726 _OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2727 _LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2729 TOKEN_PRIVILEGES tp;
2730 tp.PrivilegeCount = 1;
2731 tp.Privileges[0].Luid = luid;
2732 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2734 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2735 // privilege. Check GetLastError() too. See MSDN document.
2736 if (_AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2737 (GetLastError() == ERROR_SUCCESS)) {
2738 return true;
2739 }
2740 }
2742 return false;
2743 }
2745 static void cleanup_after_large_page_init() {
2746 _GetLargePageMinimum = NULL;
2747 _AdjustTokenPrivileges = NULL;
2748 _OpenProcessToken = NULL;
2749 _LookupPrivilegeValue = NULL;
2750 if (_kernel32) FreeLibrary(_kernel32);
2751 _kernel32 = NULL;
2752 if (_advapi32) FreeLibrary(_advapi32);
2753 _advapi32 = NULL;
2754 if (_hProcess) CloseHandle(_hProcess);
2755 _hProcess = NULL;
2756 if (_hToken) CloseHandle(_hToken);
2757 _hToken = NULL;
2758 }
2760 bool os::large_page_init() {
2761 if (!UseLargePages) return false;
2763 // print a warning if any large page related flag is specified on command line
2764 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2765 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2766 bool success = false;
2768 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2769 if (resolve_functions_for_large_page_init()) {
2770 if (request_lock_memory_privilege()) {
2771 size_t s = _GetLargePageMinimum();
2772 if (s) {
2773 #if defined(IA32) || defined(AMD64)
2774 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2775 WARN("JVM cannot use large pages bigger than 4mb.");
2776 } else {
2777 #endif
2778 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2779 _large_page_size = LargePageSizeInBytes;
2780 } else {
2781 _large_page_size = s;
2782 }
2783 success = true;
2784 #if defined(IA32) || defined(AMD64)
2785 }
2786 #endif
2787 } else {
2788 WARN("Large page is not supported by the processor.");
2789 }
2790 } else {
2791 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2792 }
2793 } else {
2794 WARN("Large page is not supported by the operating system.");
2795 }
2796 #undef WARN
2798 const size_t default_page_size = (size_t) vm_page_size();
2799 if (success && _large_page_size > default_page_size) {
2800 _page_sizes[0] = _large_page_size;
2801 _page_sizes[1] = default_page_size;
2802 _page_sizes[2] = 0;
2803 }
2805 cleanup_after_large_page_init();
2806 return success;
2807 }
2809 // On win32, one cannot release just a part of reserved memory, it's an
2810 // all or nothing deal. When we split a reservation, we must break the
2811 // reservation into two reservations.
2812 void os::split_reserved_memory(char *base, size_t size, size_t split,
2813 bool realloc) {
2814 if (size > 0) {
2815 release_memory(base, size);
2816 if (realloc) {
2817 reserve_memory(split, base);
2818 }
2819 if (size != split) {
2820 reserve_memory(size - split, base + split);
2821 }
2822 }
2823 }
2825 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2826 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2827 "reserve alignment");
2828 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2829 char* res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2830 assert(res == NULL || addr == NULL || addr == res,
2831 "Unexpected address from reserve.");
2832 return res;
2833 }
2835 // Reserve memory at an arbitrary address, only if that area is
2836 // available (and not reserved for something else).
2837 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2838 // Windows os::reserve_memory() fails of the requested address range is
2839 // not avilable.
2840 return reserve_memory(bytes, requested_addr);
2841 }
2843 size_t os::large_page_size() {
2844 return _large_page_size;
2845 }
2847 bool os::can_commit_large_page_memory() {
2848 // Windows only uses large page memory when the entire region is reserved
2849 // and committed in a single VirtualAlloc() call. This may change in the
2850 // future, but with Windows 2003 it's not possible to commit on demand.
2851 return false;
2852 }
2854 bool os::can_execute_large_page_memory() {
2855 return true;
2856 }
2858 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2860 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2862 if (UseLargePagesIndividualAllocation) {
2863 if (TracePageSizes && Verbose) {
2864 tty->print_cr("Reserving large pages individually.");
2865 }
2866 char * p_buf;
2867 // first reserve enough address space in advance since we want to be
2868 // able to break a single contiguous virtual address range into multiple
2869 // large page commits but WS2003 does not allow reserving large page space
2870 // so we just use 4K pages for reserve, this gives us a legal contiguous
2871 // address space. then we will deallocate that reservation, and re alloc
2872 // using large pages
2873 const size_t size_of_reserve = bytes + _large_page_size;
2874 if (bytes > size_of_reserve) {
2875 // Overflowed.
2876 warning("Individually allocated large pages failed, "
2877 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2878 return NULL;
2879 }
2880 p_buf = (char *) VirtualAlloc(addr,
2881 size_of_reserve, // size of Reserve
2882 MEM_RESERVE,
2883 PAGE_READWRITE);
2884 // If reservation failed, return NULL
2885 if (p_buf == NULL) return NULL;
2887 release_memory(p_buf, bytes + _large_page_size);
2888 // round up to page boundary. If the size_of_reserve did not
2889 // overflow and the reservation did not fail, this align up
2890 // should not overflow.
2891 p_buf = (char *) align_size_up((size_t)p_buf, _large_page_size);
2893 // now go through and allocate one page at a time until all bytes are
2894 // allocated
2895 size_t bytes_remaining = align_size_up(bytes, _large_page_size);
2896 // An overflow of align_size_up() would have been caught above
2897 // in the calculation of size_of_reserve.
2898 char * next_alloc_addr = p_buf;
2900 #ifdef ASSERT
2901 // Variable for the failure injection
2902 long ran_num = os::random();
2903 size_t fail_after = ran_num % bytes;
2904 #endif
2906 while (bytes_remaining) {
2907 size_t bytes_to_rq = MIN2(bytes_remaining, _large_page_size);
2908 // Note allocate and commit
2909 char * p_new;
2911 #ifdef ASSERT
2912 bool inject_error = LargePagesIndividualAllocationInjectError &&
2913 (bytes_remaining <= fail_after);
2914 #else
2915 const bool inject_error = false;
2916 #endif
2918 if (inject_error) {
2919 p_new = NULL;
2920 } else {
2921 p_new = (char *) VirtualAlloc(next_alloc_addr,
2922 bytes_to_rq,
2923 MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES,
2924 prot);
2925 }
2927 if (p_new == NULL) {
2928 // Free any allocated pages
2929 if (next_alloc_addr > p_buf) {
2930 // Some memory was committed so release it.
2931 size_t bytes_to_release = bytes - bytes_remaining;
2932 release_memory(p_buf, bytes_to_release);
2933 }
2934 #ifdef ASSERT
2935 if (UseLargePagesIndividualAllocation &&
2936 LargePagesIndividualAllocationInjectError) {
2937 if (TracePageSizes && Verbose) {
2938 tty->print_cr("Reserving large pages individually failed.");
2939 }
2940 }
2941 #endif
2942 return NULL;
2943 }
2944 bytes_remaining -= bytes_to_rq;
2945 next_alloc_addr += bytes_to_rq;
2946 }
2948 return p_buf;
2950 } else {
2951 // normal policy just allocate it all at once
2952 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2953 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
2954 return res;
2955 }
2956 }
2958 bool os::release_memory_special(char* base, size_t bytes) {
2959 return release_memory(base, bytes);
2960 }
2962 void os::print_statistics() {
2963 }
2965 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2966 if (bytes == 0) {
2967 // Don't bother the OS with noops.
2968 return true;
2969 }
2970 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
2971 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
2972 // Don't attempt to print anything if the OS call fails. We're
2973 // probably low on resources, so the print itself may cause crashes.
2974 bool result = VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) != 0;
2975 if (result != NULL && exec) {
2976 DWORD oldprot;
2977 // Windows doc says to use VirtualProtect to get execute permissions
2978 return VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot) != 0;
2979 } else {
2980 return result;
2981 }
2982 }
2984 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
2985 bool exec) {
2986 return commit_memory(addr, size, exec);
2987 }
2989 bool os::uncommit_memory(char* addr, size_t bytes) {
2990 if (bytes == 0) {
2991 // Don't bother the OS with noops.
2992 return true;
2993 }
2994 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
2995 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
2996 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
2997 }
2999 bool os::release_memory(char* addr, size_t bytes) {
3000 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3001 }
3003 bool os::create_stack_guard_pages(char* addr, size_t size) {
3004 return os::commit_memory(addr, size);
3005 }
3007 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3008 return os::uncommit_memory(addr, size);
3009 }
3011 // Set protections specified
3012 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3013 bool is_committed) {
3014 unsigned int p = 0;
3015 switch (prot) {
3016 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3017 case MEM_PROT_READ: p = PAGE_READONLY; break;
3018 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3019 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3020 default:
3021 ShouldNotReachHere();
3022 }
3024 DWORD old_status;
3026 // Strange enough, but on Win32 one can change protection only for committed
3027 // memory, not a big deal anyway, as bytes less or equal than 64K
3028 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3029 fatal("cannot commit protection page");
3030 }
3031 // One cannot use os::guard_memory() here, as on Win32 guard page
3032 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3033 //
3034 // Pages in the region become guard pages. Any attempt to access a guard page
3035 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3036 // the guard page status. Guard pages thus act as a one-time access alarm.
3037 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3038 }
3040 bool os::guard_memory(char* addr, size_t bytes) {
3041 DWORD old_status;
3042 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3043 }
3045 bool os::unguard_memory(char* addr, size_t bytes) {
3046 DWORD old_status;
3047 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3048 }
3050 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3051 void os::free_memory(char *addr, size_t bytes) { }
3052 void os::numa_make_global(char *addr, size_t bytes) { }
3053 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3054 bool os::numa_topology_changed() { return false; }
3055 size_t os::numa_get_groups_num() { return 1; }
3056 int os::numa_get_group_id() { return 0; }
3057 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3058 if (size > 0) {
3059 ids[0] = 0;
3060 return 1;
3061 }
3062 return 0;
3063 }
3065 bool os::get_page_info(char *start, page_info* info) {
3066 return false;
3067 }
3069 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3070 return end;
3071 }
3073 char* os::non_memory_address_word() {
3074 // Must never look like an address returned by reserve_memory,
3075 // even in its subfields (as defined by the CPU immediate fields,
3076 // if the CPU splits constants across multiple instructions).
3077 return (char*)-1;
3078 }
3080 #define MAX_ERROR_COUNT 100
3081 #define SYS_THREAD_ERROR 0xffffffffUL
3083 void os::pd_start_thread(Thread* thread) {
3084 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3085 // Returns previous suspend state:
3086 // 0: Thread was not suspended
3087 // 1: Thread is running now
3088 // >1: Thread is still suspended.
3089 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3090 }
3092 class HighResolutionInterval {
3093 // The default timer resolution seems to be 10 milliseconds.
3094 // (Where is this written down?)
3095 // If someone wants to sleep for only a fraction of the default,
3096 // then we set the timer resolution down to 1 millisecond for
3097 // the duration of their interval.
3098 // We carefully set the resolution back, since otherwise we
3099 // seem to incur an overhead (3%?) that we don't need.
3100 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3101 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3102 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3103 // timeBeginPeriod() if the relative error exceeded some threshold.
3104 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3105 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3106 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3107 // resolution timers running.
3108 private:
3109 jlong resolution;
3110 public:
3111 HighResolutionInterval(jlong ms) {
3112 resolution = ms % 10L;
3113 if (resolution != 0) {
3114 MMRESULT result = timeBeginPeriod(1L);
3115 }
3116 }
3117 ~HighResolutionInterval() {
3118 if (resolution != 0) {
3119 MMRESULT result = timeEndPeriod(1L);
3120 }
3121 resolution = 0L;
3122 }
3123 };
3125 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3126 jlong limit = (jlong) MAXDWORD;
3128 while(ms > limit) {
3129 int res;
3130 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3131 return res;
3132 ms -= limit;
3133 }
3135 assert(thread == Thread::current(), "thread consistency check");
3136 OSThread* osthread = thread->osthread();
3137 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3138 int result;
3139 if (interruptable) {
3140 assert(thread->is_Java_thread(), "must be java thread");
3141 JavaThread *jt = (JavaThread *) thread;
3142 ThreadBlockInVM tbivm(jt);
3144 jt->set_suspend_equivalent();
3145 // cleared by handle_special_suspend_equivalent_condition() or
3146 // java_suspend_self() via check_and_wait_while_suspended()
3148 HANDLE events[1];
3149 events[0] = osthread->interrupt_event();
3150 HighResolutionInterval *phri=NULL;
3151 if(!ForceTimeHighResolution)
3152 phri = new HighResolutionInterval( ms );
3153 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3154 result = OS_TIMEOUT;
3155 } else {
3156 ResetEvent(osthread->interrupt_event());
3157 osthread->set_interrupted(false);
3158 result = OS_INTRPT;
3159 }
3160 delete phri; //if it is NULL, harmless
3162 // were we externally suspended while we were waiting?
3163 jt->check_and_wait_while_suspended();
3164 } else {
3165 assert(!thread->is_Java_thread(), "must not be java thread");
3166 Sleep((long) ms);
3167 result = OS_TIMEOUT;
3168 }
3169 return result;
3170 }
3172 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3173 void os::infinite_sleep() {
3174 while (true) { // sleep forever ...
3175 Sleep(100000); // ... 100 seconds at a time
3176 }
3177 }
3179 typedef BOOL (WINAPI * STTSignature)(void) ;
3181 os::YieldResult os::NakedYield() {
3182 // Use either SwitchToThread() or Sleep(0)
3183 // Consider passing back the return value from SwitchToThread().
3184 // We use GetProcAddress() as ancient Win9X versions of windows doen't support SwitchToThread.
3185 // In that case we revert to Sleep(0).
3186 static volatile STTSignature stt = (STTSignature) 1 ;
3188 if (stt == ((STTSignature) 1)) {
3189 stt = (STTSignature) ::GetProcAddress (LoadLibrary ("Kernel32.dll"), "SwitchToThread") ;
3190 // It's OK if threads race during initialization as the operation above is idempotent.
3191 }
3192 if (stt != NULL) {
3193 return (*stt)() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3194 } else {
3195 Sleep (0) ;
3196 }
3197 return os::YIELD_UNKNOWN ;
3198 }
3200 void os::yield() { os::NakedYield(); }
3202 void os::yield_all(int attempts) {
3203 // Yields to all threads, including threads with lower priorities
3204 Sleep(1);
3205 }
3207 // Win32 only gives you access to seven real priorities at a time,
3208 // so we compress Java's ten down to seven. It would be better
3209 // if we dynamically adjusted relative priorities.
3211 int os::java_to_os_priority[MaxPriority + 1] = {
3212 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3213 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3214 THREAD_PRIORITY_LOWEST, // 2
3215 THREAD_PRIORITY_BELOW_NORMAL, // 3
3216 THREAD_PRIORITY_BELOW_NORMAL, // 4
3217 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3218 THREAD_PRIORITY_NORMAL, // 6
3219 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3220 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3221 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3222 THREAD_PRIORITY_HIGHEST // 10 MaxPriority
3223 };
3225 int prio_policy1[MaxPriority + 1] = {
3226 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3227 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3228 THREAD_PRIORITY_LOWEST, // 2
3229 THREAD_PRIORITY_BELOW_NORMAL, // 3
3230 THREAD_PRIORITY_BELOW_NORMAL, // 4
3231 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3232 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3233 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3234 THREAD_PRIORITY_HIGHEST, // 8
3235 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3236 THREAD_PRIORITY_TIME_CRITICAL // 10 MaxPriority
3237 };
3239 static int prio_init() {
3240 // If ThreadPriorityPolicy is 1, switch tables
3241 if (ThreadPriorityPolicy == 1) {
3242 int i;
3243 for (i = 0; i < MaxPriority + 1; i++) {
3244 os::java_to_os_priority[i] = prio_policy1[i];
3245 }
3246 }
3247 return 0;
3248 }
3250 OSReturn os::set_native_priority(Thread* thread, int priority) {
3251 if (!UseThreadPriorities) return OS_OK;
3252 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3253 return ret ? OS_OK : OS_ERR;
3254 }
3256 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3257 if ( !UseThreadPriorities ) {
3258 *priority_ptr = java_to_os_priority[NormPriority];
3259 return OS_OK;
3260 }
3261 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3262 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3263 assert(false, "GetThreadPriority failed");
3264 return OS_ERR;
3265 }
3266 *priority_ptr = os_prio;
3267 return OS_OK;
3268 }
3271 // Hint to the underlying OS that a task switch would not be good.
3272 // Void return because it's a hint and can fail.
3273 void os::hint_no_preempt() {}
3275 void os::interrupt(Thread* thread) {
3276 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3277 "possibility of dangling Thread pointer");
3279 OSThread* osthread = thread->osthread();
3280 osthread->set_interrupted(true);
3281 // More than one thread can get here with the same value of osthread,
3282 // resulting in multiple notifications. We do, however, want the store
3283 // to interrupted() to be visible to other threads before we post
3284 // the interrupt event.
3285 OrderAccess::release();
3286 SetEvent(osthread->interrupt_event());
3287 // For JSR166: unpark after setting status
3288 if (thread->is_Java_thread())
3289 ((JavaThread*)thread)->parker()->unpark();
3291 ParkEvent * ev = thread->_ParkEvent ;
3292 if (ev != NULL) ev->unpark() ;
3294 }
3297 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3298 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3299 "possibility of dangling Thread pointer");
3301 OSThread* osthread = thread->osthread();
3302 bool interrupted;
3303 interrupted = osthread->interrupted();
3304 if (clear_interrupted == true) {
3305 osthread->set_interrupted(false);
3306 ResetEvent(osthread->interrupt_event());
3307 } // Otherwise leave the interrupted state alone
3309 return interrupted;
3310 }
3312 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3313 ExtendedPC os::get_thread_pc(Thread* thread) {
3314 CONTEXT context;
3315 context.ContextFlags = CONTEXT_CONTROL;
3316 HANDLE handle = thread->osthread()->thread_handle();
3317 #ifdef _M_IA64
3318 assert(0, "Fix get_thread_pc");
3319 return ExtendedPC(NULL);
3320 #else
3321 if (GetThreadContext(handle, &context)) {
3322 #ifdef _M_AMD64
3323 return ExtendedPC((address) context.Rip);
3324 #else
3325 return ExtendedPC((address) context.Eip);
3326 #endif
3327 } else {
3328 return ExtendedPC(NULL);
3329 }
3330 #endif
3331 }
3333 // GetCurrentThreadId() returns DWORD
3334 intx os::current_thread_id() { return GetCurrentThreadId(); }
3336 static int _initial_pid = 0;
3338 int os::current_process_id()
3339 {
3340 return (_initial_pid ? _initial_pid : _getpid());
3341 }
3343 int os::win32::_vm_page_size = 0;
3344 int os::win32::_vm_allocation_granularity = 0;
3345 int os::win32::_processor_type = 0;
3346 // Processor level is not available on non-NT systems, use vm_version instead
3347 int os::win32::_processor_level = 0;
3348 julong os::win32::_physical_memory = 0;
3349 size_t os::win32::_default_stack_size = 0;
3351 intx os::win32::_os_thread_limit = 0;
3352 volatile intx os::win32::_os_thread_count = 0;
3354 bool os::win32::_is_nt = false;
3355 bool os::win32::_is_windows_2003 = false;
3356 bool os::win32::_is_windows_server = false;
3358 void os::win32::initialize_system_info() {
3359 SYSTEM_INFO si;
3360 GetSystemInfo(&si);
3361 _vm_page_size = si.dwPageSize;
3362 _vm_allocation_granularity = si.dwAllocationGranularity;
3363 _processor_type = si.dwProcessorType;
3364 _processor_level = si.wProcessorLevel;
3365 set_processor_count(si.dwNumberOfProcessors);
3367 MEMORYSTATUSEX ms;
3368 ms.dwLength = sizeof(ms);
3370 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3371 // dwMemoryLoad (% of memory in use)
3372 GlobalMemoryStatusEx(&ms);
3373 _physical_memory = ms.ullTotalPhys;
3375 OSVERSIONINFOEX oi;
3376 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3377 GetVersionEx((OSVERSIONINFO*)&oi);
3378 switch(oi.dwPlatformId) {
3379 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3380 case VER_PLATFORM_WIN32_NT:
3381 _is_nt = true;
3382 {
3383 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3384 if (os_vers == 5002) {
3385 _is_windows_2003 = true;
3386 }
3387 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3388 oi.wProductType == VER_NT_SERVER) {
3389 _is_windows_server = true;
3390 }
3391 }
3392 break;
3393 default: fatal("Unknown platform");
3394 }
3396 _default_stack_size = os::current_stack_size();
3397 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3398 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3399 "stack size not a multiple of page size");
3401 initialize_performance_counter();
3403 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3404 // known to deadlock the system, if the VM issues to thread operations with
3405 // a too high frequency, e.g., such as changing the priorities.
3406 // The 6000 seems to work well - no deadlocks has been notices on the test
3407 // programs that we have seen experience this problem.
3408 if (!os::win32::is_nt()) {
3409 StarvationMonitorInterval = 6000;
3410 }
3411 }
3414 void os::win32::setmode_streams() {
3415 _setmode(_fileno(stdin), _O_BINARY);
3416 _setmode(_fileno(stdout), _O_BINARY);
3417 _setmode(_fileno(stderr), _O_BINARY);
3418 }
3421 bool os::is_debugger_attached() {
3422 return IsDebuggerPresent() ? true : false;
3423 }
3426 void os::wait_for_keypress_at_exit(void) {
3427 if (PauseAtExit) {
3428 fprintf(stderr, "Press any key to continue...\n");
3429 fgetc(stdin);
3430 }
3431 }
3434 int os::message_box(const char* title, const char* message) {
3435 int result = MessageBox(NULL, message, title,
3436 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3437 return result == IDYES;
3438 }
3440 int os::allocate_thread_local_storage() {
3441 return TlsAlloc();
3442 }
3445 void os::free_thread_local_storage(int index) {
3446 TlsFree(index);
3447 }
3450 void os::thread_local_storage_at_put(int index, void* value) {
3451 TlsSetValue(index, value);
3452 assert(thread_local_storage_at(index) == value, "Just checking");
3453 }
3456 void* os::thread_local_storage_at(int index) {
3457 return TlsGetValue(index);
3458 }
3461 #ifndef PRODUCT
3462 #ifndef _WIN64
3463 // Helpers to check whether NX protection is enabled
3464 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3465 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3466 pex->ExceptionRecord->NumberParameters > 0 &&
3467 pex->ExceptionRecord->ExceptionInformation[0] ==
3468 EXCEPTION_INFO_EXEC_VIOLATION) {
3469 return EXCEPTION_EXECUTE_HANDLER;
3470 }
3471 return EXCEPTION_CONTINUE_SEARCH;
3472 }
3474 void nx_check_protection() {
3475 // If NX is enabled we'll get an exception calling into code on the stack
3476 char code[] = { (char)0xC3 }; // ret
3477 void *code_ptr = (void *)code;
3478 __try {
3479 __asm call code_ptr
3480 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3481 tty->print_raw_cr("NX protection detected.");
3482 }
3483 }
3484 #endif // _WIN64
3485 #endif // PRODUCT
3487 // this is called _before_ the global arguments have been parsed
3488 void os::init(void) {
3489 _initial_pid = _getpid();
3491 init_random(1234567);
3493 win32::initialize_system_info();
3494 win32::setmode_streams();
3495 init_page_sizes((size_t) win32::vm_page_size());
3497 // For better scalability on MP systems (must be called after initialize_system_info)
3498 #ifndef PRODUCT
3499 if (is_MP()) {
3500 NoYieldsInMicrolock = true;
3501 }
3502 #endif
3503 // This may be overridden later when argument processing is done.
3504 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3505 os::win32::is_windows_2003());
3507 // Initialize main_process and main_thread
3508 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3509 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3510 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3511 fatal("DuplicateHandle failed\n");
3512 }
3513 main_thread_id = (int) GetCurrentThreadId();
3514 }
3516 // To install functions for atexit processing
3517 extern "C" {
3518 static void perfMemory_exit_helper() {
3519 perfMemory_exit();
3520 }
3521 }
3523 // this is called _after_ the global arguments have been parsed
3524 jint os::init_2(void) {
3525 // Allocate a single page and mark it as readable for safepoint polling
3526 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3527 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3529 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3530 guarantee( return_page != NULL, "Commit Failed for polling page");
3532 os::set_polling_page( polling_page );
3534 #ifndef PRODUCT
3535 if( Verbose && PrintMiscellaneous )
3536 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3537 #endif
3539 if (!UseMembar) {
3540 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3541 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3543 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3544 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3546 os::set_memory_serialize_page( mem_serialize_page );
3548 #ifndef PRODUCT
3549 if(Verbose && PrintMiscellaneous)
3550 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3551 #endif
3552 }
3554 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
3556 // Setup Windows Exceptions
3558 // On Itanium systems, Structured Exception Handling does not
3559 // work since stack frames must be walkable by the OS. Since
3560 // much of our code is dynamically generated, and we do not have
3561 // proper unwind .xdata sections, the system simply exits
3562 // rather than delivering the exception. To work around
3563 // this we use VectorExceptions instead.
3564 #ifdef _WIN64
3565 if (UseVectoredExceptions) {
3566 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3567 }
3568 #endif
3570 // for debugging float code generation bugs
3571 if (ForceFloatExceptions) {
3572 #ifndef _WIN64
3573 static long fp_control_word = 0;
3574 __asm { fstcw fp_control_word }
3575 // see Intel PPro Manual, Vol. 2, p 7-16
3576 const long precision = 0x20;
3577 const long underflow = 0x10;
3578 const long overflow = 0x08;
3579 const long zero_div = 0x04;
3580 const long denorm = 0x02;
3581 const long invalid = 0x01;
3582 fp_control_word |= invalid;
3583 __asm { fldcw fp_control_word }
3584 #endif
3585 }
3587 // If stack_commit_size is 0, windows will reserve the default size,
3588 // but only commit a small portion of it.
3589 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3590 size_t default_reserve_size = os::win32::default_stack_size();
3591 size_t actual_reserve_size = stack_commit_size;
3592 if (stack_commit_size < default_reserve_size) {
3593 // If stack_commit_size == 0, we want this too
3594 actual_reserve_size = default_reserve_size;
3595 }
3597 // Check minimum allowable stack size for thread creation and to initialize
3598 // the java system classes, including StackOverflowError - depends on page
3599 // size. Add a page for compiler2 recursion in main thread.
3600 // Add in 2*BytesPerWord times page size to account for VM stack during
3601 // class initialization depending on 32 or 64 bit VM.
3602 size_t min_stack_allowed =
3603 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3604 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3605 if (actual_reserve_size < min_stack_allowed) {
3606 tty->print_cr("\nThe stack size specified is too small, "
3607 "Specify at least %dk",
3608 min_stack_allowed / K);
3609 return JNI_ERR;
3610 }
3612 JavaThread::set_stack_size_at_create(stack_commit_size);
3614 // Calculate theoretical max. size of Threads to guard gainst artifical
3615 // out-of-memory situations, where all available address-space has been
3616 // reserved by thread stacks.
3617 assert(actual_reserve_size != 0, "Must have a stack");
3619 // Calculate the thread limit when we should start doing Virtual Memory
3620 // banging. Currently when the threads will have used all but 200Mb of space.
3621 //
3622 // TODO: consider performing a similar calculation for commit size instead
3623 // as reserve size, since on a 64-bit platform we'll run into that more
3624 // often than running out of virtual memory space. We can use the
3625 // lower value of the two calculations as the os_thread_limit.
3626 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3627 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3629 // at exit methods are called in the reverse order of their registration.
3630 // there is no limit to the number of functions registered. atexit does
3631 // not set errno.
3633 if (PerfAllowAtExitRegistration) {
3634 // only register atexit functions if PerfAllowAtExitRegistration is set.
3635 // atexit functions can be delayed until process exit time, which
3636 // can be problematic for embedded VM situations. Embedded VMs should
3637 // call DestroyJavaVM() to assure that VM resources are released.
3639 // note: perfMemory_exit_helper atexit function may be removed in
3640 // the future if the appropriate cleanup code can be added to the
3641 // VM_Exit VMOperation's doit method.
3642 if (atexit(perfMemory_exit_helper) != 0) {
3643 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3644 }
3645 }
3647 // initialize PSAPI or ToolHelp for fatal error handler
3648 if (win32::is_nt()) _init_psapi();
3649 else _init_toolhelp();
3651 #ifndef _WIN64
3652 // Print something if NX is enabled (win32 on AMD64)
3653 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3654 #endif
3656 // initialize thread priority policy
3657 prio_init();
3659 if (UseNUMA && !ForceNUMA) {
3660 UseNUMA = false; // Currently unsupported.
3661 }
3663 return JNI_OK;
3664 }
3666 void os::init_3(void) {
3667 return;
3668 }
3670 // Mark the polling page as unreadable
3671 void os::make_polling_page_unreadable(void) {
3672 DWORD old_status;
3673 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3674 fatal("Could not disable polling page");
3675 };
3677 // Mark the polling page as readable
3678 void os::make_polling_page_readable(void) {
3679 DWORD old_status;
3680 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3681 fatal("Could not enable polling page");
3682 };
3685 int os::stat(const char *path, struct stat *sbuf) {
3686 char pathbuf[MAX_PATH];
3687 if (strlen(path) > MAX_PATH - 1) {
3688 errno = ENAMETOOLONG;
3689 return -1;
3690 }
3691 os::native_path(strcpy(pathbuf, path));
3692 int ret = ::stat(pathbuf, sbuf);
3693 if (sbuf != NULL && UseUTCFileTimestamp) {
3694 // Fix for 6539723. st_mtime returned from stat() is dependent on
3695 // the system timezone and so can return different values for the
3696 // same file if/when daylight savings time changes. This adjustment
3697 // makes sure the same timestamp is returned regardless of the TZ.
3698 //
3699 // See:
3700 // http://msdn.microsoft.com/library/
3701 // default.asp?url=/library/en-us/sysinfo/base/
3702 // time_zone_information_str.asp
3703 // and
3704 // http://msdn.microsoft.com/library/default.asp?url=
3705 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3706 //
3707 // NOTE: there is a insidious bug here: If the timezone is changed
3708 // after the call to stat() but before 'GetTimeZoneInformation()', then
3709 // the adjustment we do here will be wrong and we'll return the wrong
3710 // value (which will likely end up creating an invalid class data
3711 // archive). Absent a better API for this, or some time zone locking
3712 // mechanism, we'll have to live with this risk.
3713 TIME_ZONE_INFORMATION tz;
3714 DWORD tzid = GetTimeZoneInformation(&tz);
3715 int daylightBias =
3716 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3717 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3718 }
3719 return ret;
3720 }
3723 #define FT2INT64(ft) \
3724 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3727 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3728 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3729 // of a thread.
3730 //
3731 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3732 // the fast estimate available on the platform.
3734 // current_thread_cpu_time() is not optimized for Windows yet
3735 jlong os::current_thread_cpu_time() {
3736 // return user + sys since the cost is the same
3737 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3738 }
3740 jlong os::thread_cpu_time(Thread* thread) {
3741 // consistent with what current_thread_cpu_time() returns.
3742 return os::thread_cpu_time(thread, true /* user+sys */);
3743 }
3745 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3746 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3747 }
3749 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3750 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3751 // If this function changes, os::is_thread_cpu_time_supported() should too
3752 if (os::win32::is_nt()) {
3753 FILETIME CreationTime;
3754 FILETIME ExitTime;
3755 FILETIME KernelTime;
3756 FILETIME UserTime;
3758 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3759 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3760 return -1;
3761 else
3762 if (user_sys_cpu_time) {
3763 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3764 } else {
3765 return FT2INT64(UserTime) * 100;
3766 }
3767 } else {
3768 return (jlong) timeGetTime() * 1000000;
3769 }
3770 }
3772 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3773 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3774 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3775 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3776 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3777 }
3779 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3780 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3781 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3782 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3783 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3784 }
3786 bool os::is_thread_cpu_time_supported() {
3787 // see os::thread_cpu_time
3788 if (os::win32::is_nt()) {
3789 FILETIME CreationTime;
3790 FILETIME ExitTime;
3791 FILETIME KernelTime;
3792 FILETIME UserTime;
3794 if ( GetThreadTimes(GetCurrentThread(),
3795 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3796 return false;
3797 else
3798 return true;
3799 } else {
3800 return false;
3801 }
3802 }
3804 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3805 // It does have primitives (PDH API) to get CPU usage and run queue length.
3806 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3807 // If we wanted to implement loadavg on Windows, we have a few options:
3808 //
3809 // a) Query CPU usage and run queue length and "fake" an answer by
3810 // returning the CPU usage if it's under 100%, and the run queue
3811 // length otherwise. It turns out that querying is pretty slow
3812 // on Windows, on the order of 200 microseconds on a fast machine.
3813 // Note that on the Windows the CPU usage value is the % usage
3814 // since the last time the API was called (and the first call
3815 // returns 100%), so we'd have to deal with that as well.
3816 //
3817 // b) Sample the "fake" answer using a sampling thread and store
3818 // the answer in a global variable. The call to loadavg would
3819 // just return the value of the global, avoiding the slow query.
3820 //
3821 // c) Sample a better answer using exponential decay to smooth the
3822 // value. This is basically the algorithm used by UNIX kernels.
3823 //
3824 // Note that sampling thread starvation could affect both (b) and (c).
3825 int os::loadavg(double loadavg[], int nelem) {
3826 return -1;
3827 }
3830 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3831 bool os::dont_yield() {
3832 return DontYieldALot;
3833 }
3835 // This method is a slightly reworked copy of JDK's sysOpen
3836 // from src/windows/hpi/src/sys_api_md.c
3838 int os::open(const char *path, int oflag, int mode) {
3839 char pathbuf[MAX_PATH];
3841 if (strlen(path) > MAX_PATH - 1) {
3842 errno = ENAMETOOLONG;
3843 return -1;
3844 }
3845 os::native_path(strcpy(pathbuf, path));
3846 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
3847 }
3849 // Is a (classpath) directory empty?
3850 bool os::dir_is_empty(const char* path) {
3851 WIN32_FIND_DATA fd;
3852 HANDLE f = FindFirstFile(path, &fd);
3853 if (f == INVALID_HANDLE_VALUE) {
3854 return true;
3855 }
3856 FindClose(f);
3857 return false;
3858 }
3860 // create binary file, rewriting existing file if required
3861 int os::create_binary_file(const char* path, bool rewrite_existing) {
3862 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3863 if (!rewrite_existing) {
3864 oflags |= _O_EXCL;
3865 }
3866 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3867 }
3869 // return current position of file pointer
3870 jlong os::current_file_offset(int fd) {
3871 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3872 }
3874 // move file pointer to the specified offset
3875 jlong os::seek_to_file_offset(int fd, jlong offset) {
3876 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
3877 }
3880 jlong os::lseek(int fd, jlong offset, int whence) {
3881 return (jlong) ::_lseeki64(fd, offset, whence);
3882 }
3884 // This method is a slightly reworked copy of JDK's sysNativePath
3885 // from src/windows/hpi/src/path_md.c
3887 /* Convert a pathname to native format. On win32, this involves forcing all
3888 separators to be '\\' rather than '/' (both are legal inputs, but Win95
3889 sometimes rejects '/') and removing redundant separators. The input path is
3890 assumed to have been converted into the character encoding used by the local
3891 system. Because this might be a double-byte encoding, care is taken to
3892 treat double-byte lead characters correctly.
3894 This procedure modifies the given path in place, as the result is never
3895 longer than the original. There is no error return; this operation always
3896 succeeds. */
3897 char * os::native_path(char *path) {
3898 char *src = path, *dst = path, *end = path;
3899 char *colon = NULL; /* If a drive specifier is found, this will
3900 point to the colon following the drive
3901 letter */
3903 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
3904 assert(((!::IsDBCSLeadByte('/'))
3905 && (!::IsDBCSLeadByte('\\'))
3906 && (!::IsDBCSLeadByte(':'))),
3907 "Illegal lead byte");
3909 /* Check for leading separators */
3910 #define isfilesep(c) ((c) == '/' || (c) == '\\')
3911 while (isfilesep(*src)) {
3912 src++;
3913 }
3915 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
3916 /* Remove leading separators if followed by drive specifier. This
3917 hack is necessary to support file URLs containing drive
3918 specifiers (e.g., "file://c:/path"). As a side effect,
3919 "/c:/path" can be used as an alternative to "c:/path". */
3920 *dst++ = *src++;
3921 colon = dst;
3922 *dst++ = ':';
3923 src++;
3924 } else {
3925 src = path;
3926 if (isfilesep(src[0]) && isfilesep(src[1])) {
3927 /* UNC pathname: Retain first separator; leave src pointed at
3928 second separator so that further separators will be collapsed
3929 into the second separator. The result will be a pathname
3930 beginning with "\\\\" followed (most likely) by a host name. */
3931 src = dst = path + 1;
3932 path[0] = '\\'; /* Force first separator to '\\' */
3933 }
3934 }
3936 end = dst;
3938 /* Remove redundant separators from remainder of path, forcing all
3939 separators to be '\\' rather than '/'. Also, single byte space
3940 characters are removed from the end of the path because those
3941 are not legal ending characters on this operating system.
3942 */
3943 while (*src != '\0') {
3944 if (isfilesep(*src)) {
3945 *dst++ = '\\'; src++;
3946 while (isfilesep(*src)) src++;
3947 if (*src == '\0') {
3948 /* Check for trailing separator */
3949 end = dst;
3950 if (colon == dst - 2) break; /* "z:\\" */
3951 if (dst == path + 1) break; /* "\\" */
3952 if (dst == path + 2 && isfilesep(path[0])) {
3953 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
3954 beginning of a UNC pathname. Even though it is not, by
3955 itself, a valid UNC pathname, we leave it as is in order
3956 to be consistent with the path canonicalizer as well
3957 as the win32 APIs, which treat this case as an invalid
3958 UNC pathname rather than as an alias for the root
3959 directory of the current drive. */
3960 break;
3961 }
3962 end = --dst; /* Path does not denote a root directory, so
3963 remove trailing separator */
3964 break;
3965 }
3966 end = dst;
3967 } else {
3968 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
3969 *dst++ = *src++;
3970 if (*src) *dst++ = *src++;
3971 end = dst;
3972 } else { /* Copy a single-byte character */
3973 char c = *src++;
3974 *dst++ = c;
3975 /* Space is not a legal ending character */
3976 if (c != ' ') end = dst;
3977 }
3978 }
3979 }
3981 *end = '\0';
3983 /* For "z:", add "." to work around a bug in the C runtime library */
3984 if (colon == dst - 1) {
3985 path[2] = '.';
3986 path[3] = '\0';
3987 }
3989 #ifdef DEBUG
3990 jio_fprintf(stderr, "sysNativePath: %s\n", path);
3991 #endif DEBUG
3992 return path;
3993 }
3995 // This code is a copy of JDK's sysSetLength
3996 // from src/windows/hpi/src/sys_api_md.c
3998 int os::ftruncate(int fd, jlong length) {
3999 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4000 long high = (long)(length >> 32);
4001 DWORD ret;
4003 if (h == (HANDLE)(-1)) {
4004 return -1;
4005 }
4007 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4008 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4009 return -1;
4010 }
4012 if (::SetEndOfFile(h) == FALSE) {
4013 return -1;
4014 }
4016 return 0;
4017 }
4020 // This code is a copy of JDK's sysSync
4021 // from src/windows/hpi/src/sys_api_md.c
4022 // except for the legacy workaround for a bug in Win 98
4024 int os::fsync(int fd) {
4025 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4027 if ( (!::FlushFileBuffers(handle)) &&
4028 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4029 /* from winerror.h */
4030 return -1;
4031 }
4032 return 0;
4033 }
4035 static int nonSeekAvailable(int, long *);
4036 static int stdinAvailable(int, long *);
4038 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4039 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4041 // This code is a copy of JDK's sysAvailable
4042 // from src/windows/hpi/src/sys_api_md.c
4044 int os::available(int fd, jlong *bytes) {
4045 jlong cur, end;
4046 struct _stati64 stbuf64;
4048 if (::_fstati64(fd, &stbuf64) >= 0) {
4049 int mode = stbuf64.st_mode;
4050 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4051 int ret;
4052 long lpbytes;
4053 if (fd == 0) {
4054 ret = stdinAvailable(fd, &lpbytes);
4055 } else {
4056 ret = nonSeekAvailable(fd, &lpbytes);
4057 }
4058 (*bytes) = (jlong)(lpbytes);
4059 return ret;
4060 }
4061 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4062 return FALSE;
4063 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4064 return FALSE;
4065 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4066 return FALSE;
4067 }
4068 *bytes = end - cur;
4069 return TRUE;
4070 } else {
4071 return FALSE;
4072 }
4073 }
4075 // This code is a copy of JDK's nonSeekAvailable
4076 // from src/windows/hpi/src/sys_api_md.c
4078 static int nonSeekAvailable(int fd, long *pbytes) {
4079 /* This is used for available on non-seekable devices
4080 * (like both named and anonymous pipes, such as pipes
4081 * connected to an exec'd process).
4082 * Standard Input is a special case.
4083 *
4084 */
4085 HANDLE han;
4087 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4088 return FALSE;
4089 }
4091 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4092 /* PeekNamedPipe fails when at EOF. In that case we
4093 * simply make *pbytes = 0 which is consistent with the
4094 * behavior we get on Solaris when an fd is at EOF.
4095 * The only alternative is to raise an Exception,
4096 * which isn't really warranted.
4097 */
4098 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4099 return FALSE;
4100 }
4101 *pbytes = 0;
4102 }
4103 return TRUE;
4104 }
4106 #define MAX_INPUT_EVENTS 2000
4108 // This code is a copy of JDK's stdinAvailable
4109 // from src/windows/hpi/src/sys_api_md.c
4111 static int stdinAvailable(int fd, long *pbytes) {
4112 HANDLE han;
4113 DWORD numEventsRead = 0; /* Number of events read from buffer */
4114 DWORD numEvents = 0; /* Number of events in buffer */
4115 DWORD i = 0; /* Loop index */
4116 DWORD curLength = 0; /* Position marker */
4117 DWORD actualLength = 0; /* Number of bytes readable */
4118 BOOL error = FALSE; /* Error holder */
4119 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4121 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4122 return FALSE;
4123 }
4125 /* Construct an array of input records in the console buffer */
4126 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4127 if (error == 0) {
4128 return nonSeekAvailable(fd, pbytes);
4129 }
4131 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4132 if (numEvents > MAX_INPUT_EVENTS) {
4133 numEvents = MAX_INPUT_EVENTS;
4134 }
4136 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD));
4137 if (lpBuffer == NULL) {
4138 return FALSE;
4139 }
4141 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4142 if (error == 0) {
4143 os::free(lpBuffer);
4144 return FALSE;
4145 }
4147 /* Examine input records for the number of bytes available */
4148 for(i=0; i<numEvents; i++) {
4149 if (lpBuffer[i].EventType == KEY_EVENT) {
4151 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4152 &(lpBuffer[i].Event);
4153 if (keyRecord->bKeyDown == TRUE) {
4154 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4155 curLength++;
4156 if (*keyPressed == '\r') {
4157 actualLength = curLength;
4158 }
4159 }
4160 }
4161 }
4163 if(lpBuffer != NULL) {
4164 os::free(lpBuffer);
4165 }
4167 *pbytes = (long) actualLength;
4168 return TRUE;
4169 }
4171 // Map a block of memory.
4172 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
4173 char *addr, size_t bytes, bool read_only,
4174 bool allow_exec) {
4175 HANDLE hFile;
4176 char* base;
4178 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4179 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4180 if (hFile == NULL) {
4181 if (PrintMiscellaneous && Verbose) {
4182 DWORD err = GetLastError();
4183 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4184 }
4185 return NULL;
4186 }
4188 if (allow_exec) {
4189 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4190 // unless it comes from a PE image (which the shared archive is not.)
4191 // Even VirtualProtect refuses to give execute access to mapped memory
4192 // that was not previously executable.
4193 //
4194 // Instead, stick the executable region in anonymous memory. Yuck.
4195 // Penalty is that ~4 pages will not be shareable - in the future
4196 // we might consider DLLizing the shared archive with a proper PE
4197 // header so that mapping executable + sharing is possible.
4199 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4200 PAGE_READWRITE);
4201 if (base == NULL) {
4202 if (PrintMiscellaneous && Verbose) {
4203 DWORD err = GetLastError();
4204 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4205 }
4206 CloseHandle(hFile);
4207 return NULL;
4208 }
4210 DWORD bytes_read;
4211 OVERLAPPED overlapped;
4212 overlapped.Offset = (DWORD)file_offset;
4213 overlapped.OffsetHigh = 0;
4214 overlapped.hEvent = NULL;
4215 // ReadFile guarantees that if the return value is true, the requested
4216 // number of bytes were read before returning.
4217 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4218 if (!res) {
4219 if (PrintMiscellaneous && Verbose) {
4220 DWORD err = GetLastError();
4221 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4222 }
4223 release_memory(base, bytes);
4224 CloseHandle(hFile);
4225 return NULL;
4226 }
4227 } else {
4228 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4229 NULL /*file_name*/);
4230 if (hMap == NULL) {
4231 if (PrintMiscellaneous && Verbose) {
4232 DWORD err = GetLastError();
4233 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4234 }
4235 CloseHandle(hFile);
4236 return NULL;
4237 }
4239 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4240 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4241 (DWORD)bytes, addr);
4242 if (base == NULL) {
4243 if (PrintMiscellaneous && Verbose) {
4244 DWORD err = GetLastError();
4245 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4246 }
4247 CloseHandle(hMap);
4248 CloseHandle(hFile);
4249 return NULL;
4250 }
4252 if (CloseHandle(hMap) == 0) {
4253 if (PrintMiscellaneous && Verbose) {
4254 DWORD err = GetLastError();
4255 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4256 }
4257 CloseHandle(hFile);
4258 return base;
4259 }
4260 }
4262 if (allow_exec) {
4263 DWORD old_protect;
4264 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4265 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4267 if (!res) {
4268 if (PrintMiscellaneous && Verbose) {
4269 DWORD err = GetLastError();
4270 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4271 }
4272 // Don't consider this a hard error, on IA32 even if the
4273 // VirtualProtect fails, we should still be able to execute
4274 CloseHandle(hFile);
4275 return base;
4276 }
4277 }
4279 if (CloseHandle(hFile) == 0) {
4280 if (PrintMiscellaneous && Verbose) {
4281 DWORD err = GetLastError();
4282 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4283 }
4284 return base;
4285 }
4287 return base;
4288 }
4291 // Remap a block of memory.
4292 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
4293 char *addr, size_t bytes, bool read_only,
4294 bool allow_exec) {
4295 // This OS does not allow existing memory maps to be remapped so we
4296 // have to unmap the memory before we remap it.
4297 if (!os::unmap_memory(addr, bytes)) {
4298 return NULL;
4299 }
4301 // There is a very small theoretical window between the unmap_memory()
4302 // call above and the map_memory() call below where a thread in native
4303 // code may be able to access an address that is no longer mapped.
4305 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4306 allow_exec);
4307 }
4310 // Unmap a block of memory.
4311 // Returns true=success, otherwise false.
4313 bool os::unmap_memory(char* addr, size_t bytes) {
4314 BOOL result = UnmapViewOfFile(addr);
4315 if (result == 0) {
4316 if (PrintMiscellaneous && Verbose) {
4317 DWORD err = GetLastError();
4318 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4319 }
4320 return false;
4321 }
4322 return true;
4323 }
4325 void os::pause() {
4326 char filename[MAX_PATH];
4327 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4328 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4329 } else {
4330 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4331 }
4333 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4334 if (fd != -1) {
4335 struct stat buf;
4336 ::close(fd);
4337 while (::stat(filename, &buf) == 0) {
4338 Sleep(100);
4339 }
4340 } else {
4341 jio_fprintf(stderr,
4342 "Could not open pause file '%s', continuing immediately.\n", filename);
4343 }
4344 }
4346 // An Event wraps a win32 "CreateEvent" kernel handle.
4347 //
4348 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4349 //
4350 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4351 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4352 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4353 // In addition, an unpark() operation might fetch the handle field, but the
4354 // event could recycle between the fetch and the SetEvent() operation.
4355 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4356 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4357 // on an stale but recycled handle would be harmless, but in practice this might
4358 // confuse other non-Sun code, so it's not a viable approach.
4359 //
4360 // 2: Once a win32 event handle is associated with an Event, it remains associated
4361 // with the Event. The event handle is never closed. This could be construed
4362 // as handle leakage, but only up to the maximum # of threads that have been extant
4363 // at any one time. This shouldn't be an issue, as windows platforms typically
4364 // permit a process to have hundreds of thousands of open handles.
4365 //
4366 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4367 // and release unused handles.
4368 //
4369 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4370 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4371 //
4372 // 5. Use an RCU-like mechanism (Read-Copy Update).
4373 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4374 //
4375 // We use (2).
4376 //
4377 // TODO-FIXME:
4378 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4379 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4380 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4381 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4382 // into a single win32 CreateEvent() handle.
4383 //
4384 // _Event transitions in park()
4385 // -1 => -1 : illegal
4386 // 1 => 0 : pass - return immediately
4387 // 0 => -1 : block
4388 //
4389 // _Event serves as a restricted-range semaphore :
4390 // -1 : thread is blocked
4391 // 0 : neutral - thread is running or ready
4392 // 1 : signaled - thread is running or ready
4393 //
4394 // Another possible encoding of _Event would be
4395 // with explicit "PARKED" and "SIGNALED" bits.
4397 int os::PlatformEvent::park (jlong Millis) {
4398 guarantee (_ParkHandle != NULL , "Invariant") ;
4399 guarantee (Millis > 0 , "Invariant") ;
4400 int v ;
4402 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4403 // the initial park() operation.
4405 for (;;) {
4406 v = _Event ;
4407 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4408 }
4409 guarantee ((v == 0) || (v == 1), "invariant") ;
4410 if (v != 0) return OS_OK ;
4412 // Do this the hard way by blocking ...
4413 // TODO: consider a brief spin here, gated on the success of recent
4414 // spin attempts by this thread.
4415 //
4416 // We decompose long timeouts into series of shorter timed waits.
4417 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4418 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4419 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4420 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4421 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4422 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4423 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4424 // for the already waited time. This policy does not admit any new outcomes.
4425 // In the future, however, we might want to track the accumulated wait time and
4426 // adjust Millis accordingly if we encounter a spurious wakeup.
4428 const int MAXTIMEOUT = 0x10000000 ;
4429 DWORD rv = WAIT_TIMEOUT ;
4430 while (_Event < 0 && Millis > 0) {
4431 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4432 if (Millis > MAXTIMEOUT) {
4433 prd = MAXTIMEOUT ;
4434 }
4435 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4436 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4437 if (rv == WAIT_TIMEOUT) {
4438 Millis -= prd ;
4439 }
4440 }
4441 v = _Event ;
4442 _Event = 0 ;
4443 OrderAccess::fence() ;
4444 // If we encounter a nearly simultanous timeout expiry and unpark()
4445 // we return OS_OK indicating we awoke via unpark().
4446 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4447 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4448 }
4450 void os::PlatformEvent::park () {
4451 guarantee (_ParkHandle != NULL, "Invariant") ;
4452 // Invariant: Only the thread associated with the Event/PlatformEvent
4453 // may call park().
4454 int v ;
4455 for (;;) {
4456 v = _Event ;
4457 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4458 }
4459 guarantee ((v == 0) || (v == 1), "invariant") ;
4460 if (v != 0) return ;
4462 // Do this the hard way by blocking ...
4463 // TODO: consider a brief spin here, gated on the success of recent
4464 // spin attempts by this thread.
4465 while (_Event < 0) {
4466 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4467 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4468 }
4470 // Usually we'll find _Event == 0 at this point, but as
4471 // an optional optimization we clear it, just in case can
4472 // multiple unpark() operations drove _Event up to 1.
4473 _Event = 0 ;
4474 OrderAccess::fence() ;
4475 guarantee (_Event >= 0, "invariant") ;
4476 }
4478 void os::PlatformEvent::unpark() {
4479 guarantee (_ParkHandle != NULL, "Invariant") ;
4480 int v ;
4481 for (;;) {
4482 v = _Event ; // Increment _Event if it's < 1.
4483 if (v > 0) {
4484 // If it's already signaled just return.
4485 // The LD of _Event could have reordered or be satisfied
4486 // by a read-aside from this processor's write buffer.
4487 // To avoid problems execute a barrier and then
4488 // ratify the value. A degenerate CAS() would also work.
4489 // Viz., CAS (v+0, &_Event, v) == v).
4490 OrderAccess::fence() ;
4491 if (_Event == v) return ;
4492 continue ;
4493 }
4494 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4495 }
4496 if (v < 0) {
4497 ::SetEvent (_ParkHandle) ;
4498 }
4499 }
4502 // JSR166
4503 // -------------------------------------------------------
4505 /*
4506 * The Windows implementation of Park is very straightforward: Basic
4507 * operations on Win32 Events turn out to have the right semantics to
4508 * use them directly. We opportunistically resuse the event inherited
4509 * from Monitor.
4510 */
4513 void Parker::park(bool isAbsolute, jlong time) {
4514 guarantee (_ParkEvent != NULL, "invariant") ;
4515 // First, demultiplex/decode time arguments
4516 if (time < 0) { // don't wait
4517 return;
4518 }
4519 else if (time == 0 && !isAbsolute) {
4520 time = INFINITE;
4521 }
4522 else if (isAbsolute) {
4523 time -= os::javaTimeMillis(); // convert to relative time
4524 if (time <= 0) // already elapsed
4525 return;
4526 }
4527 else { // relative
4528 time /= 1000000; // Must coarsen from nanos to millis
4529 if (time == 0) // Wait for the minimal time unit if zero
4530 time = 1;
4531 }
4533 JavaThread* thread = (JavaThread*)(Thread::current());
4534 assert(thread->is_Java_thread(), "Must be JavaThread");
4535 JavaThread *jt = (JavaThread *)thread;
4537 // Don't wait if interrupted or already triggered
4538 if (Thread::is_interrupted(thread, false) ||
4539 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4540 ResetEvent(_ParkEvent);
4541 return;
4542 }
4543 else {
4544 ThreadBlockInVM tbivm(jt);
4545 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4546 jt->set_suspend_equivalent();
4548 WaitForSingleObject(_ParkEvent, time);
4549 ResetEvent(_ParkEvent);
4551 // If externally suspended while waiting, re-suspend
4552 if (jt->handle_special_suspend_equivalent_condition()) {
4553 jt->java_suspend_self();
4554 }
4555 }
4556 }
4558 void Parker::unpark() {
4559 guarantee (_ParkEvent != NULL, "invariant") ;
4560 SetEvent(_ParkEvent);
4561 }
4563 // Run the specified command in a separate process. Return its exit value,
4564 // or -1 on failure (e.g. can't create a new process).
4565 int os::fork_and_exec(char* cmd) {
4566 STARTUPINFO si;
4567 PROCESS_INFORMATION pi;
4569 memset(&si, 0, sizeof(si));
4570 si.cb = sizeof(si);
4571 memset(&pi, 0, sizeof(pi));
4572 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4573 cmd, // command line
4574 NULL, // process security attribute
4575 NULL, // thread security attribute
4576 TRUE, // inherits system handles
4577 0, // no creation flags
4578 NULL, // use parent's environment block
4579 NULL, // use parent's starting directory
4580 &si, // (in) startup information
4581 &pi); // (out) process information
4583 if (rslt) {
4584 // Wait until child process exits.
4585 WaitForSingleObject(pi.hProcess, INFINITE);
4587 DWORD exit_code;
4588 GetExitCodeProcess(pi.hProcess, &exit_code);
4590 // Close process and thread handles.
4591 CloseHandle(pi.hProcess);
4592 CloseHandle(pi.hThread);
4594 return (int)exit_code;
4595 } else {
4596 return -1;
4597 }
4598 }
4600 //--------------------------------------------------------------------------------------------------
4601 // Non-product code
4603 static int mallocDebugIntervalCounter = 0;
4604 static int mallocDebugCounter = 0;
4605 bool os::check_heap(bool force) {
4606 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4607 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4608 // Note: HeapValidate executes two hardware breakpoints when it finds something
4609 // wrong; at these points, eax contains the address of the offending block (I think).
4610 // To get to the exlicit error message(s) below, just continue twice.
4611 HANDLE heap = GetProcessHeap();
4612 { HeapLock(heap);
4613 PROCESS_HEAP_ENTRY phe;
4614 phe.lpData = NULL;
4615 while (HeapWalk(heap, &phe) != 0) {
4616 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4617 !HeapValidate(heap, 0, phe.lpData)) {
4618 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4619 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4620 fatal("corrupted C heap");
4621 }
4622 }
4623 int err = GetLastError();
4624 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4625 fatal(err_msg("heap walk aborted with error %d", err));
4626 }
4627 HeapUnlock(heap);
4628 }
4629 mallocDebugIntervalCounter = 0;
4630 }
4631 return true;
4632 }
4635 bool os::find(address addr, outputStream* st) {
4636 // Nothing yet
4637 return false;
4638 }
4640 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4641 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4643 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4644 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4645 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4646 address addr = (address) exceptionRecord->ExceptionInformation[1];
4648 if (os::is_memory_serialize_page(thread, addr))
4649 return EXCEPTION_CONTINUE_EXECUTION;
4650 }
4652 return EXCEPTION_CONTINUE_SEARCH;
4653 }
4655 static int getLastErrorString(char *buf, size_t len)
4656 {
4657 long errval;
4659 if ((errval = GetLastError()) != 0)
4660 {
4661 /* DOS error */
4662 size_t n = (size_t)FormatMessage(
4663 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
4664 NULL,
4665 errval,
4666 0,
4667 buf,
4668 (DWORD)len,
4669 NULL);
4670 if (n > 3) {
4671 /* Drop final '.', CR, LF */
4672 if (buf[n - 1] == '\n') n--;
4673 if (buf[n - 1] == '\r') n--;
4674 if (buf[n - 1] == '.') n--;
4675 buf[n] = '\0';
4676 }
4677 return (int)n;
4678 }
4680 if (errno != 0)
4681 {
4682 /* C runtime error that has no corresponding DOS error code */
4683 const char *s = strerror(errno);
4684 size_t n = strlen(s);
4685 if (n >= len) n = len - 1;
4686 strncpy(buf, s, n);
4687 buf[n] = '\0';
4688 return (int)n;
4689 }
4690 return 0;
4691 }
4694 // We don't build a headless jre for Windows
4695 bool os::is_headless_jre() { return false; }
4697 // OS_SocketInterface
4698 // Not used on Windows
4700 // OS_SocketInterface
4701 typedef struct hostent * (PASCAL FAR *ws2_ifn_ptr_t)(...);
4702 ws2_ifn_ptr_t *get_host_by_name_fn = NULL;
4704 typedef CRITICAL_SECTION mutex_t;
4705 #define mutexInit(m) InitializeCriticalSection(m)
4706 #define mutexDestroy(m) DeleteCriticalSection(m)
4707 #define mutexLock(m) EnterCriticalSection(m)
4708 #define mutexUnlock(m) LeaveCriticalSection(m)
4710 static bool sockfnptrs_initialized = FALSE;
4711 static mutex_t sockFnTableMutex;
4713 /* is Winsock2 loaded? better to be explicit than to rely on sockfnptrs */
4714 static bool winsock2Available = FALSE;
4717 static void initSockFnTable() {
4718 int (PASCAL FAR* WSAStartupPtr)(WORD, LPWSADATA);
4719 WSADATA wsadata;
4721 ::mutexInit(&sockFnTableMutex);
4722 ::mutexLock(&sockFnTableMutex);
4724 if (sockfnptrs_initialized == FALSE) {
4725 HMODULE hWinsock;
4727 /* try to load Winsock2, and if that fails, load Winsock */
4728 hWinsock = ::LoadLibrary("ws2_32.dll");
4730 if (hWinsock == NULL) {
4731 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4732 ::GetLastError());
4733 return;
4734 }
4736 /* If we loaded a DLL, then we might as well initialize it. */
4737 WSAStartupPtr = (int (PASCAL FAR *)(WORD, LPWSADATA))
4738 ::GetProcAddress(hWinsock, "WSAStartup");
4740 if (WSAStartupPtr(MAKEWORD(1,1), &wsadata) != 0) {
4741 jio_fprintf(stderr, "Could not initialize Winsock\n");
4742 }
4744 get_host_by_name_fn
4745 = (ws2_ifn_ptr_t*) GetProcAddress(hWinsock, "gethostbyname");
4746 }
4748 assert(get_host_by_name_fn != NULL,
4749 "gethostbyname function not found");
4750 sockfnptrs_initialized = TRUE;
4751 ::mutexUnlock(&sockFnTableMutex);
4752 }
4754 struct hostent* os::get_host_by_name(char* name) {
4755 if (!sockfnptrs_initialized) {
4756 initSockFnTable();
4757 }
4759 assert(sockfnptrs_initialized == TRUE && get_host_by_name_fn != NULL,
4760 "sockfnptrs is not initialized or pointer to gethostbyname function is NULL");
4761 return (*get_host_by_name_fn)(name);
4762 }
4765 int os::socket_close(int fd) {
4766 ShouldNotReachHere();
4767 return 0;
4768 }
4770 int os::socket_available(int fd, jint *pbytes) {
4771 ShouldNotReachHere();
4772 return 0;
4773 }
4775 int os::socket(int domain, int type, int protocol) {
4776 ShouldNotReachHere();
4777 return 0;
4778 }
4780 int os::listen(int fd, int count) {
4781 ShouldNotReachHere();
4782 return 0;
4783 }
4785 int os::connect(int fd, struct sockaddr *him, int len) {
4786 ShouldNotReachHere();
4787 return 0;
4788 }
4790 int os::accept(int fd, struct sockaddr *him, int *len) {
4791 ShouldNotReachHere();
4792 return 0;
4793 }
4795 int os::sendto(int fd, char *buf, int len, int flags,
4796 struct sockaddr *to, int tolen) {
4797 ShouldNotReachHere();
4798 return 0;
4799 }
4801 int os::recvfrom(int fd, char *buf, int nBytes, int flags,
4802 sockaddr *from, int *fromlen) {
4803 ShouldNotReachHere();
4804 return 0;
4805 }
4807 int os::recv(int fd, char *buf, int nBytes, int flags) {
4808 ShouldNotReachHere();
4809 return 0;
4810 }
4812 int os::send(int fd, char *buf, int nBytes, int flags) {
4813 ShouldNotReachHere();
4814 return 0;
4815 }
4817 int os::raw_send(int fd, char *buf, int nBytes, int flags) {
4818 ShouldNotReachHere();
4819 return 0;
4820 }
4822 int os::timeout(int fd, long timeout) {
4823 ShouldNotReachHere();
4824 return 0;
4825 }
4827 int os::get_host_name(char* name, int namelen) {
4828 ShouldNotReachHere();
4829 return 0;
4830 }
4832 int os::socket_shutdown(int fd, int howto) {
4833 ShouldNotReachHere();
4834 return 0;
4835 }
4837 int os::bind(int fd, struct sockaddr *him, int len) {
4838 ShouldNotReachHere();
4839 return 0;
4840 }
4842 int os::get_sock_name(int fd, struct sockaddr *him, int *len) {
4843 ShouldNotReachHere();
4844 return 0;
4845 }
4847 int os::get_sock_opt(int fd, int level, int optname,
4848 char *optval, int* optlen) {
4849 ShouldNotReachHere();
4850 return 0;
4851 }
4853 int os::set_sock_opt(int fd, int level, int optname,
4854 const char *optval, int optlen) {
4855 ShouldNotReachHere();
4856 return 0;
4857 }