Tue, 24 Apr 2012 12:15:32 -0700
7157695: Add windows implementation of socket interface
Reviewed-by: kvn, dholmes, twisti
Contributed-by: Nils Eliasson <nils.eliasson@oracle.com>
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 // Must be at least Windows 2000 or XP to use VectoredExceptions and IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "jvm_windows.h"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "mutex_windows.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "os_share_windows.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/runtimeService.hpp"
62 #include "thread_windows.inline.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
68 #ifdef TARGET_ARCH_x86
69 # include "assembler_x86.inline.hpp"
70 # include "nativeInst_x86.hpp"
71 #endif
72 #ifdef COMPILER1
73 #include "c1/c1_Runtime1.hpp"
74 #endif
75 #ifdef COMPILER2
76 #include "opto/runtime.hpp"
77 #endif
79 #ifdef _DEBUG
80 #include <crtdbg.h>
81 #endif
84 #include <windows.h>
85 #include <sys/types.h>
86 #include <sys/stat.h>
87 #include <sys/timeb.h>
88 #include <objidl.h>
89 #include <shlobj.h>
91 #include <malloc.h>
92 #include <signal.h>
93 #include <direct.h>
94 #include <errno.h>
95 #include <fcntl.h>
96 #include <io.h>
97 #include <process.h> // For _beginthreadex(), _endthreadex()
98 #include <imagehlp.h> // For os::dll_address_to_function_name
100 /* for enumerating dll libraries */
101 #include <vdmdbg.h>
103 // for timer info max values which include all bits
104 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
106 // For DLL loading/load error detection
107 // Values of PE COFF
108 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
109 #define IMAGE_FILE_SIGNATURE_LENGTH 4
111 static HANDLE main_process;
112 static HANDLE main_thread;
113 static int main_thread_id;
115 static FILETIME process_creation_time;
116 static FILETIME process_exit_time;
117 static FILETIME process_user_time;
118 static FILETIME process_kernel_time;
120 #ifdef _WIN64
121 PVOID topLevelVectoredExceptionHandler = NULL;
122 #endif
124 #ifdef _M_IA64
125 #define __CPU__ ia64
126 #elif _M_AMD64
127 #define __CPU__ amd64
128 #else
129 #define __CPU__ i486
130 #endif
132 // save DLL module handle, used by GetModuleFileName
134 HINSTANCE vm_lib_handle;
136 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
137 switch (reason) {
138 case DLL_PROCESS_ATTACH:
139 vm_lib_handle = hinst;
140 if(ForceTimeHighResolution)
141 timeBeginPeriod(1L);
142 break;
143 case DLL_PROCESS_DETACH:
144 if(ForceTimeHighResolution)
145 timeEndPeriod(1L);
146 #ifdef _WIN64
147 if (topLevelVectoredExceptionHandler != NULL) {
148 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
149 topLevelVectoredExceptionHandler = NULL;
150 }
151 #endif
152 break;
153 default:
154 break;
155 }
156 return true;
157 }
159 static inline double fileTimeAsDouble(FILETIME* time) {
160 const double high = (double) ((unsigned int) ~0);
161 const double split = 10000000.0;
162 double result = (time->dwLowDateTime / split) +
163 time->dwHighDateTime * (high/split);
164 return result;
165 }
167 // Implementation of os
169 bool os::getenv(const char* name, char* buffer, int len) {
170 int result = GetEnvironmentVariable(name, buffer, len);
171 return result > 0 && result < len;
172 }
175 // No setuid programs under Windows.
176 bool os::have_special_privileges() {
177 return false;
178 }
181 // This method is a periodic task to check for misbehaving JNI applications
182 // under CheckJNI, we can add any periodic checks here.
183 // For Windows at the moment does nothing
184 void os::run_periodic_checks() {
185 return;
186 }
188 #ifndef _WIN64
189 // previous UnhandledExceptionFilter, if there is one
190 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
192 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
193 #endif
194 void os::init_system_properties_values() {
195 /* sysclasspath, java_home, dll_dir */
196 {
197 char *home_path;
198 char *dll_path;
199 char *pslash;
200 char *bin = "\\bin";
201 char home_dir[MAX_PATH];
203 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
204 os::jvm_path(home_dir, sizeof(home_dir));
205 // Found the full path to jvm[_g].dll.
206 // Now cut the path to <java_home>/jre if we can.
207 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
208 pslash = strrchr(home_dir, '\\');
209 if (pslash != NULL) {
210 *pslash = '\0'; /* get rid of \{client|server} */
211 pslash = strrchr(home_dir, '\\');
212 if (pslash != NULL)
213 *pslash = '\0'; /* get rid of \bin */
214 }
215 }
217 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1);
218 if (home_path == NULL)
219 return;
220 strcpy(home_path, home_dir);
221 Arguments::set_java_home(home_path);
223 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1);
224 if (dll_path == NULL)
225 return;
226 strcpy(dll_path, home_dir);
227 strcat(dll_path, bin);
228 Arguments::set_dll_dir(dll_path);
230 if (!set_boot_path('\\', ';'))
231 return;
232 }
234 /* library_path */
235 #define EXT_DIR "\\lib\\ext"
236 #define BIN_DIR "\\bin"
237 #define PACKAGE_DIR "\\Sun\\Java"
238 {
239 /* Win32 library search order (See the documentation for LoadLibrary):
240 *
241 * 1. The directory from which application is loaded.
242 * 2. The system wide Java Extensions directory (Java only)
243 * 3. System directory (GetSystemDirectory)
244 * 4. Windows directory (GetWindowsDirectory)
245 * 5. The PATH environment variable
246 * 6. The current directory
247 */
249 char *library_path;
250 char tmp[MAX_PATH];
251 char *path_str = ::getenv("PATH");
253 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
254 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10);
256 library_path[0] = '\0';
258 GetModuleFileName(NULL, tmp, sizeof(tmp));
259 *(strrchr(tmp, '\\')) = '\0';
260 strcat(library_path, tmp);
262 GetWindowsDirectory(tmp, sizeof(tmp));
263 strcat(library_path, ";");
264 strcat(library_path, tmp);
265 strcat(library_path, PACKAGE_DIR BIN_DIR);
267 GetSystemDirectory(tmp, sizeof(tmp));
268 strcat(library_path, ";");
269 strcat(library_path, tmp);
271 GetWindowsDirectory(tmp, sizeof(tmp));
272 strcat(library_path, ";");
273 strcat(library_path, tmp);
275 if (path_str) {
276 strcat(library_path, ";");
277 strcat(library_path, path_str);
278 }
280 strcat(library_path, ";.");
282 Arguments::set_library_path(library_path);
283 FREE_C_HEAP_ARRAY(char, library_path);
284 }
286 /* Default extensions directory */
287 {
288 char path[MAX_PATH];
289 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
290 GetWindowsDirectory(path, MAX_PATH);
291 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
292 path, PACKAGE_DIR, EXT_DIR);
293 Arguments::set_ext_dirs(buf);
294 }
295 #undef EXT_DIR
296 #undef BIN_DIR
297 #undef PACKAGE_DIR
299 /* Default endorsed standards directory. */
300 {
301 #define ENDORSED_DIR "\\lib\\endorsed"
302 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
303 char * buf = NEW_C_HEAP_ARRAY(char, len);
304 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
305 Arguments::set_endorsed_dirs(buf);
306 #undef ENDORSED_DIR
307 }
309 #ifndef _WIN64
310 // set our UnhandledExceptionFilter and save any previous one
311 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
312 #endif
314 // Done
315 return;
316 }
318 void os::breakpoint() {
319 DebugBreak();
320 }
322 // Invoked from the BREAKPOINT Macro
323 extern "C" void breakpoint() {
324 os::breakpoint();
325 }
327 // os::current_stack_base()
328 //
329 // Returns the base of the stack, which is the stack's
330 // starting address. This function must be called
331 // while running on the stack of the thread being queried.
333 address os::current_stack_base() {
334 MEMORY_BASIC_INFORMATION minfo;
335 address stack_bottom;
336 size_t stack_size;
338 VirtualQuery(&minfo, &minfo, sizeof(minfo));
339 stack_bottom = (address)minfo.AllocationBase;
340 stack_size = minfo.RegionSize;
342 // Add up the sizes of all the regions with the same
343 // AllocationBase.
344 while( 1 )
345 {
346 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
347 if ( stack_bottom == (address)minfo.AllocationBase )
348 stack_size += minfo.RegionSize;
349 else
350 break;
351 }
353 #ifdef _M_IA64
354 // IA64 has memory and register stacks
355 stack_size = stack_size / 2;
356 #endif
357 return stack_bottom + stack_size;
358 }
360 size_t os::current_stack_size() {
361 size_t sz;
362 MEMORY_BASIC_INFORMATION minfo;
363 VirtualQuery(&minfo, &minfo, sizeof(minfo));
364 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
365 return sz;
366 }
368 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
369 const struct tm* time_struct_ptr = localtime(clock);
370 if (time_struct_ptr != NULL) {
371 *res = *time_struct_ptr;
372 return res;
373 }
374 return NULL;
375 }
377 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
379 // Thread start routine for all new Java threads
380 static unsigned __stdcall java_start(Thread* thread) {
381 // Try to randomize the cache line index of hot stack frames.
382 // This helps when threads of the same stack traces evict each other's
383 // cache lines. The threads can be either from the same JVM instance, or
384 // from different JVM instances. The benefit is especially true for
385 // processors with hyperthreading technology.
386 static int counter = 0;
387 int pid = os::current_process_id();
388 _alloca(((pid ^ counter++) & 7) * 128);
390 OSThread* osthr = thread->osthread();
391 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
393 if (UseNUMA) {
394 int lgrp_id = os::numa_get_group_id();
395 if (lgrp_id != -1) {
396 thread->set_lgrp_id(lgrp_id);
397 }
398 }
401 if (UseVectoredExceptions) {
402 // If we are using vectored exception we don't need to set a SEH
403 thread->run();
404 }
405 else {
406 // Install a win32 structured exception handler around every thread created
407 // by VM, so VM can genrate error dump when an exception occurred in non-
408 // Java thread (e.g. VM thread).
409 __try {
410 thread->run();
411 } __except(topLevelExceptionFilter(
412 (_EXCEPTION_POINTERS*)_exception_info())) {
413 // Nothing to do.
414 }
415 }
417 // One less thread is executing
418 // When the VMThread gets here, the main thread may have already exited
419 // which frees the CodeHeap containing the Atomic::add code
420 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
421 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
422 }
424 return 0;
425 }
427 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
428 // Allocate the OSThread object
429 OSThread* osthread = new OSThread(NULL, NULL);
430 if (osthread == NULL) return NULL;
432 // Initialize support for Java interrupts
433 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
434 if (interrupt_event == NULL) {
435 delete osthread;
436 return NULL;
437 }
438 osthread->set_interrupt_event(interrupt_event);
440 // Store info on the Win32 thread into the OSThread
441 osthread->set_thread_handle(thread_handle);
442 osthread->set_thread_id(thread_id);
444 if (UseNUMA) {
445 int lgrp_id = os::numa_get_group_id();
446 if (lgrp_id != -1) {
447 thread->set_lgrp_id(lgrp_id);
448 }
449 }
451 // Initial thread state is INITIALIZED, not SUSPENDED
452 osthread->set_state(INITIALIZED);
454 return osthread;
455 }
458 bool os::create_attached_thread(JavaThread* thread) {
459 #ifdef ASSERT
460 thread->verify_not_published();
461 #endif
462 HANDLE thread_h;
463 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
464 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
465 fatal("DuplicateHandle failed\n");
466 }
467 OSThread* osthread = create_os_thread(thread, thread_h,
468 (int)current_thread_id());
469 if (osthread == NULL) {
470 return false;
471 }
473 // Initial thread state is RUNNABLE
474 osthread->set_state(RUNNABLE);
476 thread->set_osthread(osthread);
477 return true;
478 }
480 bool os::create_main_thread(JavaThread* thread) {
481 #ifdef ASSERT
482 thread->verify_not_published();
483 #endif
484 if (_starting_thread == NULL) {
485 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
486 if (_starting_thread == NULL) {
487 return false;
488 }
489 }
491 // The primordial thread is runnable from the start)
492 _starting_thread->set_state(RUNNABLE);
494 thread->set_osthread(_starting_thread);
495 return true;
496 }
498 // Allocate and initialize a new OSThread
499 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
500 unsigned thread_id;
502 // Allocate the OSThread object
503 OSThread* osthread = new OSThread(NULL, NULL);
504 if (osthread == NULL) {
505 return false;
506 }
508 // Initialize support for Java interrupts
509 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
510 if (interrupt_event == NULL) {
511 delete osthread;
512 return NULL;
513 }
514 osthread->set_interrupt_event(interrupt_event);
515 osthread->set_interrupted(false);
517 thread->set_osthread(osthread);
519 if (stack_size == 0) {
520 switch (thr_type) {
521 case os::java_thread:
522 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
523 if (JavaThread::stack_size_at_create() > 0)
524 stack_size = JavaThread::stack_size_at_create();
525 break;
526 case os::compiler_thread:
527 if (CompilerThreadStackSize > 0) {
528 stack_size = (size_t)(CompilerThreadStackSize * K);
529 break;
530 } // else fall through:
531 // use VMThreadStackSize if CompilerThreadStackSize is not defined
532 case os::vm_thread:
533 case os::pgc_thread:
534 case os::cgc_thread:
535 case os::watcher_thread:
536 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
537 break;
538 }
539 }
541 // Create the Win32 thread
542 //
543 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
544 // does not specify stack size. Instead, it specifies the size of
545 // initially committed space. The stack size is determined by
546 // PE header in the executable. If the committed "stack_size" is larger
547 // than default value in the PE header, the stack is rounded up to the
548 // nearest multiple of 1MB. For example if the launcher has default
549 // stack size of 320k, specifying any size less than 320k does not
550 // affect the actual stack size at all, it only affects the initial
551 // commitment. On the other hand, specifying 'stack_size' larger than
552 // default value may cause significant increase in memory usage, because
553 // not only the stack space will be rounded up to MB, but also the
554 // entire space is committed upfront.
555 //
556 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
557 // for CreateThread() that can treat 'stack_size' as stack size. However we
558 // are not supposed to call CreateThread() directly according to MSDN
559 // document because JVM uses C runtime library. The good news is that the
560 // flag appears to work with _beginthredex() as well.
562 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
563 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
564 #endif
566 HANDLE thread_handle =
567 (HANDLE)_beginthreadex(NULL,
568 (unsigned)stack_size,
569 (unsigned (__stdcall *)(void*)) java_start,
570 thread,
571 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
572 &thread_id);
573 if (thread_handle == NULL) {
574 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
575 // without the flag.
576 thread_handle =
577 (HANDLE)_beginthreadex(NULL,
578 (unsigned)stack_size,
579 (unsigned (__stdcall *)(void*)) java_start,
580 thread,
581 CREATE_SUSPENDED,
582 &thread_id);
583 }
584 if (thread_handle == NULL) {
585 // Need to clean up stuff we've allocated so far
586 CloseHandle(osthread->interrupt_event());
587 thread->set_osthread(NULL);
588 delete osthread;
589 return NULL;
590 }
592 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
594 // Store info on the Win32 thread into the OSThread
595 osthread->set_thread_handle(thread_handle);
596 osthread->set_thread_id(thread_id);
598 // Initial thread state is INITIALIZED, not SUSPENDED
599 osthread->set_state(INITIALIZED);
601 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
602 return true;
603 }
606 // Free Win32 resources related to the OSThread
607 void os::free_thread(OSThread* osthread) {
608 assert(osthread != NULL, "osthread not set");
609 CloseHandle(osthread->thread_handle());
610 CloseHandle(osthread->interrupt_event());
611 delete osthread;
612 }
615 static int has_performance_count = 0;
616 static jlong first_filetime;
617 static jlong initial_performance_count;
618 static jlong performance_frequency;
621 jlong as_long(LARGE_INTEGER x) {
622 jlong result = 0; // initialization to avoid warning
623 set_high(&result, x.HighPart);
624 set_low(&result, x.LowPart);
625 return result;
626 }
629 jlong os::elapsed_counter() {
630 LARGE_INTEGER count;
631 if (has_performance_count) {
632 QueryPerformanceCounter(&count);
633 return as_long(count) - initial_performance_count;
634 } else {
635 FILETIME wt;
636 GetSystemTimeAsFileTime(&wt);
637 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
638 }
639 }
642 jlong os::elapsed_frequency() {
643 if (has_performance_count) {
644 return performance_frequency;
645 } else {
646 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
647 return 10000000;
648 }
649 }
652 julong os::available_memory() {
653 return win32::available_memory();
654 }
656 julong os::win32::available_memory() {
657 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
658 // value if total memory is larger than 4GB
659 MEMORYSTATUSEX ms;
660 ms.dwLength = sizeof(ms);
661 GlobalMemoryStatusEx(&ms);
663 return (julong)ms.ullAvailPhys;
664 }
666 julong os::physical_memory() {
667 return win32::physical_memory();
668 }
670 julong os::allocatable_physical_memory(julong size) {
671 #ifdef _LP64
672 return size;
673 #else
674 // Limit to 1400m because of the 2gb address space wall
675 return MIN2(size, (julong)1400*M);
676 #endif
677 }
679 // VC6 lacks DWORD_PTR
680 #if _MSC_VER < 1300
681 typedef UINT_PTR DWORD_PTR;
682 #endif
684 int os::active_processor_count() {
685 DWORD_PTR lpProcessAffinityMask = 0;
686 DWORD_PTR lpSystemAffinityMask = 0;
687 int proc_count = processor_count();
688 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
689 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
690 // Nof active processors is number of bits in process affinity mask
691 int bitcount = 0;
692 while (lpProcessAffinityMask != 0) {
693 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
694 bitcount++;
695 }
696 return bitcount;
697 } else {
698 return proc_count;
699 }
700 }
702 void os::set_native_thread_name(const char *name) {
703 // Not yet implemented.
704 return;
705 }
707 bool os::distribute_processes(uint length, uint* distribution) {
708 // Not yet implemented.
709 return false;
710 }
712 bool os::bind_to_processor(uint processor_id) {
713 // Not yet implemented.
714 return false;
715 }
717 static void initialize_performance_counter() {
718 LARGE_INTEGER count;
719 if (QueryPerformanceFrequency(&count)) {
720 has_performance_count = 1;
721 performance_frequency = as_long(count);
722 QueryPerformanceCounter(&count);
723 initial_performance_count = as_long(count);
724 } else {
725 has_performance_count = 0;
726 FILETIME wt;
727 GetSystemTimeAsFileTime(&wt);
728 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
729 }
730 }
733 double os::elapsedTime() {
734 return (double) elapsed_counter() / (double) elapsed_frequency();
735 }
738 // Windows format:
739 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
740 // Java format:
741 // Java standards require the number of milliseconds since 1/1/1970
743 // Constant offset - calculated using offset()
744 static jlong _offset = 116444736000000000;
745 // Fake time counter for reproducible results when debugging
746 static jlong fake_time = 0;
748 #ifdef ASSERT
749 // Just to be safe, recalculate the offset in debug mode
750 static jlong _calculated_offset = 0;
751 static int _has_calculated_offset = 0;
753 jlong offset() {
754 if (_has_calculated_offset) return _calculated_offset;
755 SYSTEMTIME java_origin;
756 java_origin.wYear = 1970;
757 java_origin.wMonth = 1;
758 java_origin.wDayOfWeek = 0; // ignored
759 java_origin.wDay = 1;
760 java_origin.wHour = 0;
761 java_origin.wMinute = 0;
762 java_origin.wSecond = 0;
763 java_origin.wMilliseconds = 0;
764 FILETIME jot;
765 if (!SystemTimeToFileTime(&java_origin, &jot)) {
766 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
767 }
768 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
769 _has_calculated_offset = 1;
770 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
771 return _calculated_offset;
772 }
773 #else
774 jlong offset() {
775 return _offset;
776 }
777 #endif
779 jlong windows_to_java_time(FILETIME wt) {
780 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
781 return (a - offset()) / 10000;
782 }
784 FILETIME java_to_windows_time(jlong l) {
785 jlong a = (l * 10000) + offset();
786 FILETIME result;
787 result.dwHighDateTime = high(a);
788 result.dwLowDateTime = low(a);
789 return result;
790 }
792 // For now, we say that Windows does not support vtime. I have no idea
793 // whether it can actually be made to (DLD, 9/13/05).
795 bool os::supports_vtime() { return false; }
796 bool os::enable_vtime() { return false; }
797 bool os::vtime_enabled() { return false; }
798 double os::elapsedVTime() {
799 // better than nothing, but not much
800 return elapsedTime();
801 }
803 jlong os::javaTimeMillis() {
804 if (UseFakeTimers) {
805 return fake_time++;
806 } else {
807 FILETIME wt;
808 GetSystemTimeAsFileTime(&wt);
809 return windows_to_java_time(wt);
810 }
811 }
813 jlong os::javaTimeNanos() {
814 if (!has_performance_count) {
815 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
816 } else {
817 LARGE_INTEGER current_count;
818 QueryPerformanceCounter(¤t_count);
819 double current = as_long(current_count);
820 double freq = performance_frequency;
821 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
822 return time;
823 }
824 }
826 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
827 if (!has_performance_count) {
828 // javaTimeMillis() doesn't have much percision,
829 // but it is not going to wrap -- so all 64 bits
830 info_ptr->max_value = ALL_64_BITS;
832 // this is a wall clock timer, so may skip
833 info_ptr->may_skip_backward = true;
834 info_ptr->may_skip_forward = true;
835 } else {
836 jlong freq = performance_frequency;
837 if (freq < NANOSECS_PER_SEC) {
838 // the performance counter is 64 bits and we will
839 // be multiplying it -- so no wrap in 64 bits
840 info_ptr->max_value = ALL_64_BITS;
841 } else if (freq > NANOSECS_PER_SEC) {
842 // use the max value the counter can reach to
843 // determine the max value which could be returned
844 julong max_counter = (julong)ALL_64_BITS;
845 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
846 } else {
847 // the performance counter is 64 bits and we will
848 // be using it directly -- so no wrap in 64 bits
849 info_ptr->max_value = ALL_64_BITS;
850 }
852 // using a counter, so no skipping
853 info_ptr->may_skip_backward = false;
854 info_ptr->may_skip_forward = false;
855 }
856 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
857 }
859 char* os::local_time_string(char *buf, size_t buflen) {
860 SYSTEMTIME st;
861 GetLocalTime(&st);
862 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
863 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
864 return buf;
865 }
867 bool os::getTimesSecs(double* process_real_time,
868 double* process_user_time,
869 double* process_system_time) {
870 HANDLE h_process = GetCurrentProcess();
871 FILETIME create_time, exit_time, kernel_time, user_time;
872 BOOL result = GetProcessTimes(h_process,
873 &create_time,
874 &exit_time,
875 &kernel_time,
876 &user_time);
877 if (result != 0) {
878 FILETIME wt;
879 GetSystemTimeAsFileTime(&wt);
880 jlong rtc_millis = windows_to_java_time(wt);
881 jlong user_millis = windows_to_java_time(user_time);
882 jlong system_millis = windows_to_java_time(kernel_time);
883 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
884 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
885 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
886 return true;
887 } else {
888 return false;
889 }
890 }
892 void os::shutdown() {
894 // allow PerfMemory to attempt cleanup of any persistent resources
895 perfMemory_exit();
897 // flush buffered output, finish log files
898 ostream_abort();
900 // Check for abort hook
901 abort_hook_t abort_hook = Arguments::abort_hook();
902 if (abort_hook != NULL) {
903 abort_hook();
904 }
905 }
908 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
909 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
911 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
912 HINSTANCE dbghelp;
913 EXCEPTION_POINTERS ep;
914 MINIDUMP_EXCEPTION_INFORMATION mei;
915 MINIDUMP_EXCEPTION_INFORMATION* pmei;
917 HANDLE hProcess = GetCurrentProcess();
918 DWORD processId = GetCurrentProcessId();
919 HANDLE dumpFile;
920 MINIDUMP_TYPE dumpType;
921 static const char* cwd;
923 // If running on a client version of Windows and user has not explicitly enabled dumping
924 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
925 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
926 return;
927 // If running on a server version of Windows and user has explictly disabled dumping
928 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
929 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
930 return;
931 }
933 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
935 if (dbghelp == NULL) {
936 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
937 return;
938 }
940 _MiniDumpWriteDump = CAST_TO_FN_PTR(
941 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
942 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
943 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
945 if (_MiniDumpWriteDump == NULL) {
946 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
947 return;
948 }
950 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
952 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
953 // API_VERSION_NUMBER 11 or higher contains the ones we want though
954 #if API_VERSION_NUMBER >= 11
955 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
956 MiniDumpWithUnloadedModules);
957 #endif
959 cwd = get_current_directory(NULL, 0);
960 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
961 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
963 if (dumpFile == INVALID_HANDLE_VALUE) {
964 VMError::report_coredump_status("Failed to create file for dumping", false);
965 return;
966 }
967 if (exceptionRecord != NULL && contextRecord != NULL) {
968 ep.ContextRecord = (PCONTEXT) contextRecord;
969 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
971 mei.ThreadId = GetCurrentThreadId();
972 mei.ExceptionPointers = &ep;
973 pmei = &mei;
974 } else {
975 pmei = NULL;
976 }
979 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
980 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
981 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
982 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
983 VMError::report_coredump_status("Call to MiniDumpWriteDump() failed", false);
984 } else {
985 VMError::report_coredump_status(buffer, true);
986 }
988 CloseHandle(dumpFile);
989 }
993 void os::abort(bool dump_core)
994 {
995 os::shutdown();
996 // no core dump on Windows
997 ::exit(1);
998 }
1000 // Die immediately, no exit hook, no abort hook, no cleanup.
1001 void os::die() {
1002 _exit(-1);
1003 }
1005 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1006 // * dirent_md.c 1.15 00/02/02
1007 //
1008 // The declarations for DIR and struct dirent are in jvm_win32.h.
1010 /* Caller must have already run dirname through JVM_NativePath, which removes
1011 duplicate slashes and converts all instances of '/' into '\\'. */
1013 DIR *
1014 os::opendir(const char *dirname)
1015 {
1016 assert(dirname != NULL, "just checking"); // hotspot change
1017 DIR *dirp = (DIR *)malloc(sizeof(DIR));
1018 DWORD fattr; // hotspot change
1019 char alt_dirname[4] = { 0, 0, 0, 0 };
1021 if (dirp == 0) {
1022 errno = ENOMEM;
1023 return 0;
1024 }
1026 /*
1027 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1028 * as a directory in FindFirstFile(). We detect this case here and
1029 * prepend the current drive name.
1030 */
1031 if (dirname[1] == '\0' && dirname[0] == '\\') {
1032 alt_dirname[0] = _getdrive() + 'A' - 1;
1033 alt_dirname[1] = ':';
1034 alt_dirname[2] = '\\';
1035 alt_dirname[3] = '\0';
1036 dirname = alt_dirname;
1037 }
1039 dirp->path = (char *)malloc(strlen(dirname) + 5);
1040 if (dirp->path == 0) {
1041 free(dirp);
1042 errno = ENOMEM;
1043 return 0;
1044 }
1045 strcpy(dirp->path, dirname);
1047 fattr = GetFileAttributes(dirp->path);
1048 if (fattr == 0xffffffff) {
1049 free(dirp->path);
1050 free(dirp);
1051 errno = ENOENT;
1052 return 0;
1053 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1054 free(dirp->path);
1055 free(dirp);
1056 errno = ENOTDIR;
1057 return 0;
1058 }
1060 /* Append "*.*", or possibly "\\*.*", to path */
1061 if (dirp->path[1] == ':'
1062 && (dirp->path[2] == '\0'
1063 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1064 /* No '\\' needed for cases like "Z:" or "Z:\" */
1065 strcat(dirp->path, "*.*");
1066 } else {
1067 strcat(dirp->path, "\\*.*");
1068 }
1070 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1071 if (dirp->handle == INVALID_HANDLE_VALUE) {
1072 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1073 free(dirp->path);
1074 free(dirp);
1075 errno = EACCES;
1076 return 0;
1077 }
1078 }
1079 return dirp;
1080 }
1082 /* parameter dbuf unused on Windows */
1084 struct dirent *
1085 os::readdir(DIR *dirp, dirent *dbuf)
1086 {
1087 assert(dirp != NULL, "just checking"); // hotspot change
1088 if (dirp->handle == INVALID_HANDLE_VALUE) {
1089 return 0;
1090 }
1092 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1094 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1095 if (GetLastError() == ERROR_INVALID_HANDLE) {
1096 errno = EBADF;
1097 return 0;
1098 }
1099 FindClose(dirp->handle);
1100 dirp->handle = INVALID_HANDLE_VALUE;
1101 }
1103 return &dirp->dirent;
1104 }
1106 int
1107 os::closedir(DIR *dirp)
1108 {
1109 assert(dirp != NULL, "just checking"); // hotspot change
1110 if (dirp->handle != INVALID_HANDLE_VALUE) {
1111 if (!FindClose(dirp->handle)) {
1112 errno = EBADF;
1113 return -1;
1114 }
1115 dirp->handle = INVALID_HANDLE_VALUE;
1116 }
1117 free(dirp->path);
1118 free(dirp);
1119 return 0;
1120 }
1122 // This must be hard coded because it's the system's temporary
1123 // directory not the java application's temp directory, ala java.io.tmpdir.
1124 const char* os::get_temp_directory() {
1125 static char path_buf[MAX_PATH];
1126 if (GetTempPath(MAX_PATH, path_buf)>0)
1127 return path_buf;
1128 else{
1129 path_buf[0]='\0';
1130 return path_buf;
1131 }
1132 }
1134 static bool file_exists(const char* filename) {
1135 if (filename == NULL || strlen(filename) == 0) {
1136 return false;
1137 }
1138 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1139 }
1141 void os::dll_build_name(char *buffer, size_t buflen,
1142 const char* pname, const char* fname) {
1143 const size_t pnamelen = pname ? strlen(pname) : 0;
1144 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1146 // Quietly truncates on buffer overflow. Should be an error.
1147 if (pnamelen + strlen(fname) + 10 > buflen) {
1148 *buffer = '\0';
1149 return;
1150 }
1152 if (pnamelen == 0) {
1153 jio_snprintf(buffer, buflen, "%s.dll", fname);
1154 } else if (c == ':' || c == '\\') {
1155 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1156 } else if (strchr(pname, *os::path_separator()) != NULL) {
1157 int n;
1158 char** pelements = split_path(pname, &n);
1159 for (int i = 0 ; i < n ; i++) {
1160 char* path = pelements[i];
1161 // Really shouldn't be NULL, but check can't hurt
1162 size_t plen = (path == NULL) ? 0 : strlen(path);
1163 if (plen == 0) {
1164 continue; // skip the empty path values
1165 }
1166 const char lastchar = path[plen - 1];
1167 if (lastchar == ':' || lastchar == '\\') {
1168 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1169 } else {
1170 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1171 }
1172 if (file_exists(buffer)) {
1173 break;
1174 }
1175 }
1176 // release the storage
1177 for (int i = 0 ; i < n ; i++) {
1178 if (pelements[i] != NULL) {
1179 FREE_C_HEAP_ARRAY(char, pelements[i]);
1180 }
1181 }
1182 if (pelements != NULL) {
1183 FREE_C_HEAP_ARRAY(char*, pelements);
1184 }
1185 } else {
1186 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1187 }
1188 }
1190 // Needs to be in os specific directory because windows requires another
1191 // header file <direct.h>
1192 const char* os::get_current_directory(char *buf, int buflen) {
1193 return _getcwd(buf, buflen);
1194 }
1196 //-----------------------------------------------------------
1197 // Helper functions for fatal error handler
1198 #ifdef _WIN64
1199 // Helper routine which returns true if address in
1200 // within the NTDLL address space.
1201 //
1202 static bool _addr_in_ntdll( address addr )
1203 {
1204 HMODULE hmod;
1205 MODULEINFO minfo;
1207 hmod = GetModuleHandle("NTDLL.DLL");
1208 if ( hmod == NULL ) return false;
1209 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1210 &minfo, sizeof(MODULEINFO)) )
1211 return false;
1213 if ( (addr >= minfo.lpBaseOfDll) &&
1214 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1215 return true;
1216 else
1217 return false;
1218 }
1219 #endif
1222 // Enumerate all modules for a given process ID
1223 //
1224 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1225 // different API for doing this. We use PSAPI.DLL on NT based
1226 // Windows and ToolHelp on 95/98/Me.
1228 // Callback function that is called by enumerate_modules() on
1229 // every DLL module.
1230 // Input parameters:
1231 // int pid,
1232 // char* module_file_name,
1233 // address module_base_addr,
1234 // unsigned module_size,
1235 // void* param
1236 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1238 // enumerate_modules for Windows NT, using PSAPI
1239 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1240 {
1241 HANDLE hProcess ;
1243 # define MAX_NUM_MODULES 128
1244 HMODULE modules[MAX_NUM_MODULES];
1245 static char filename[ MAX_PATH ];
1246 int result = 0;
1248 if (!os::PSApiDll::PSApiAvailable()) {
1249 return 0;
1250 }
1252 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1253 FALSE, pid ) ;
1254 if (hProcess == NULL) return 0;
1256 DWORD size_needed;
1257 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1258 sizeof(modules), &size_needed)) {
1259 CloseHandle( hProcess );
1260 return 0;
1261 }
1263 // number of modules that are currently loaded
1264 int num_modules = size_needed / sizeof(HMODULE);
1266 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1267 // Get Full pathname:
1268 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1269 filename, sizeof(filename))) {
1270 filename[0] = '\0';
1271 }
1273 MODULEINFO modinfo;
1274 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1275 &modinfo, sizeof(modinfo))) {
1276 modinfo.lpBaseOfDll = NULL;
1277 modinfo.SizeOfImage = 0;
1278 }
1280 // Invoke callback function
1281 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1282 modinfo.SizeOfImage, param);
1283 if (result) break;
1284 }
1286 CloseHandle( hProcess ) ;
1287 return result;
1288 }
1291 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1292 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1293 {
1294 HANDLE hSnapShot ;
1295 static MODULEENTRY32 modentry ;
1296 int result = 0;
1298 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1299 return 0;
1300 }
1302 // Get a handle to a Toolhelp snapshot of the system
1303 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1304 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1305 return FALSE ;
1306 }
1308 // iterate through all modules
1309 modentry.dwSize = sizeof(MODULEENTRY32) ;
1310 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1312 while( not_done ) {
1313 // invoke the callback
1314 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1315 modentry.modBaseSize, param);
1316 if (result) break;
1318 modentry.dwSize = sizeof(MODULEENTRY32) ;
1319 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1320 }
1322 CloseHandle(hSnapShot);
1323 return result;
1324 }
1326 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1327 {
1328 // Get current process ID if caller doesn't provide it.
1329 if (!pid) pid = os::current_process_id();
1331 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1332 else return _enumerate_modules_windows(pid, func, param);
1333 }
1335 struct _modinfo {
1336 address addr;
1337 char* full_path; // point to a char buffer
1338 int buflen; // size of the buffer
1339 address base_addr;
1340 };
1342 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1343 unsigned size, void * param) {
1344 struct _modinfo *pmod = (struct _modinfo *)param;
1345 if (!pmod) return -1;
1347 if (base_addr <= pmod->addr &&
1348 base_addr+size > pmod->addr) {
1349 // if a buffer is provided, copy path name to the buffer
1350 if (pmod->full_path) {
1351 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1352 }
1353 pmod->base_addr = base_addr;
1354 return 1;
1355 }
1356 return 0;
1357 }
1359 bool os::dll_address_to_library_name(address addr, char* buf,
1360 int buflen, int* offset) {
1361 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1362 // return the full path to the DLL file, sometimes it returns path
1363 // to the corresponding PDB file (debug info); sometimes it only
1364 // returns partial path, which makes life painful.
1366 struct _modinfo mi;
1367 mi.addr = addr;
1368 mi.full_path = buf;
1369 mi.buflen = buflen;
1370 int pid = os::current_process_id();
1371 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1372 // buf already contains path name
1373 if (offset) *offset = addr - mi.base_addr;
1374 return true;
1375 } else {
1376 if (buf) buf[0] = '\0';
1377 if (offset) *offset = -1;
1378 return false;
1379 }
1380 }
1382 bool os::dll_address_to_function_name(address addr, char *buf,
1383 int buflen, int *offset) {
1384 if (Decoder::decode(addr, buf, buflen, offset)) {
1385 return true;
1386 }
1387 if (offset != NULL) *offset = -1;
1388 if (buf != NULL) buf[0] = '\0';
1389 return false;
1390 }
1392 // save the start and end address of jvm.dll into param[0] and param[1]
1393 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1394 unsigned size, void * param) {
1395 if (!param) return -1;
1397 if (base_addr <= (address)_locate_jvm_dll &&
1398 base_addr+size > (address)_locate_jvm_dll) {
1399 ((address*)param)[0] = base_addr;
1400 ((address*)param)[1] = base_addr + size;
1401 return 1;
1402 }
1403 return 0;
1404 }
1406 address vm_lib_location[2]; // start and end address of jvm.dll
1408 // check if addr is inside jvm.dll
1409 bool os::address_is_in_vm(address addr) {
1410 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1411 int pid = os::current_process_id();
1412 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1413 assert(false, "Can't find jvm module.");
1414 return false;
1415 }
1416 }
1418 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1419 }
1421 // print module info; param is outputStream*
1422 static int _print_module(int pid, char* fname, address base,
1423 unsigned size, void* param) {
1424 if (!param) return -1;
1426 outputStream* st = (outputStream*)param;
1428 address end_addr = base + size;
1429 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1430 return 0;
1431 }
1433 // Loads .dll/.so and
1434 // in case of error it checks if .dll/.so was built for the
1435 // same architecture as Hotspot is running on
1436 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1437 {
1438 void * result = LoadLibrary(name);
1439 if (result != NULL)
1440 {
1441 return result;
1442 }
1444 DWORD errcode = GetLastError();
1445 if (errcode == ERROR_MOD_NOT_FOUND) {
1446 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1447 ebuf[ebuflen-1]='\0';
1448 return NULL;
1449 }
1451 // Parsing dll below
1452 // If we can read dll-info and find that dll was built
1453 // for an architecture other than Hotspot is running in
1454 // - then print to buffer "DLL was built for a different architecture"
1455 // else call os::lasterror to obtain system error message
1457 // Read system error message into ebuf
1458 // It may or may not be overwritten below (in the for loop and just above)
1459 lasterror(ebuf, (size_t) ebuflen);
1460 ebuf[ebuflen-1]='\0';
1461 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1462 if (file_descriptor<0)
1463 {
1464 return NULL;
1465 }
1467 uint32_t signature_offset;
1468 uint16_t lib_arch=0;
1469 bool failed_to_get_lib_arch=
1470 (
1471 //Go to position 3c in the dll
1472 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1473 ||
1474 // Read loacation of signature
1475 (sizeof(signature_offset)!=
1476 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1477 ||
1478 //Go to COFF File Header in dll
1479 //that is located after"signature" (4 bytes long)
1480 (os::seek_to_file_offset(file_descriptor,
1481 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1482 ||
1483 //Read field that contains code of architecture
1484 // that dll was build for
1485 (sizeof(lib_arch)!=
1486 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1487 );
1489 ::close(file_descriptor);
1490 if (failed_to_get_lib_arch)
1491 {
1492 // file i/o error - report os::lasterror(...) msg
1493 return NULL;
1494 }
1496 typedef struct
1497 {
1498 uint16_t arch_code;
1499 char* arch_name;
1500 } arch_t;
1502 static const arch_t arch_array[]={
1503 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1504 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1505 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1506 };
1507 #if (defined _M_IA64)
1508 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1509 #elif (defined _M_AMD64)
1510 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1511 #elif (defined _M_IX86)
1512 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1513 #else
1514 #error Method os::dll_load requires that one of following \
1515 is defined :_M_IA64,_M_AMD64 or _M_IX86
1516 #endif
1519 // Obtain a string for printf operation
1520 // lib_arch_str shall contain string what platform this .dll was built for
1521 // running_arch_str shall string contain what platform Hotspot was built for
1522 char *running_arch_str=NULL,*lib_arch_str=NULL;
1523 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1524 {
1525 if (lib_arch==arch_array[i].arch_code)
1526 lib_arch_str=arch_array[i].arch_name;
1527 if (running_arch==arch_array[i].arch_code)
1528 running_arch_str=arch_array[i].arch_name;
1529 }
1531 assert(running_arch_str,
1532 "Didn't find runing architecture code in arch_array");
1534 // If the architure is right
1535 // but some other error took place - report os::lasterror(...) msg
1536 if (lib_arch == running_arch)
1537 {
1538 return NULL;
1539 }
1541 if (lib_arch_str!=NULL)
1542 {
1543 ::_snprintf(ebuf, ebuflen-1,
1544 "Can't load %s-bit .dll on a %s-bit platform",
1545 lib_arch_str,running_arch_str);
1546 }
1547 else
1548 {
1549 // don't know what architecture this dll was build for
1550 ::_snprintf(ebuf, ebuflen-1,
1551 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1552 lib_arch,running_arch_str);
1553 }
1555 return NULL;
1556 }
1559 void os::print_dll_info(outputStream *st) {
1560 int pid = os::current_process_id();
1561 st->print_cr("Dynamic libraries:");
1562 enumerate_modules(pid, _print_module, (void *)st);
1563 }
1565 void os::print_os_info(outputStream* st) {
1566 st->print("OS:");
1568 OSVERSIONINFOEX osvi;
1569 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1570 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1572 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1573 st->print_cr("N/A");
1574 return;
1575 }
1577 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1578 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1579 switch (os_vers) {
1580 case 3051: st->print(" Windows NT 3.51"); break;
1581 case 4000: st->print(" Windows NT 4.0"); break;
1582 case 5000: st->print(" Windows 2000"); break;
1583 case 5001: st->print(" Windows XP"); break;
1584 case 5002:
1585 case 6000:
1586 case 6001: {
1587 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1588 // find out whether we are running on 64 bit processor or not.
1589 SYSTEM_INFO si;
1590 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1591 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1592 GetSystemInfo(&si);
1593 } else {
1594 os::Kernel32Dll::GetNativeSystemInfo(&si);
1595 }
1596 if (os_vers == 5002) {
1597 if (osvi.wProductType == VER_NT_WORKSTATION &&
1598 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1599 st->print(" Windows XP x64 Edition");
1600 else
1601 st->print(" Windows Server 2003 family");
1602 } else if (os_vers == 6000) {
1603 if (osvi.wProductType == VER_NT_WORKSTATION)
1604 st->print(" Windows Vista");
1605 else
1606 st->print(" Windows Server 2008");
1607 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1608 st->print(" , 64 bit");
1609 } else if (os_vers == 6001) {
1610 if (osvi.wProductType == VER_NT_WORKSTATION) {
1611 st->print(" Windows 7");
1612 } else {
1613 // Unrecognized windows, print out its major and minor versions
1614 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1615 }
1616 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1617 st->print(" , 64 bit");
1618 } else { // future os
1619 // Unrecognized windows, print out its major and minor versions
1620 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1621 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1622 st->print(" , 64 bit");
1623 }
1624 break;
1625 }
1626 default: // future windows, print out its major and minor versions
1627 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1628 }
1629 } else {
1630 switch (os_vers) {
1631 case 4000: st->print(" Windows 95"); break;
1632 case 4010: st->print(" Windows 98"); break;
1633 case 4090: st->print(" Windows Me"); break;
1634 default: // future windows, print out its major and minor versions
1635 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1636 }
1637 }
1638 st->print(" Build %d", osvi.dwBuildNumber);
1639 st->print(" %s", osvi.szCSDVersion); // service pack
1640 st->cr();
1641 }
1643 void os::pd_print_cpu_info(outputStream* st) {
1644 // Nothing to do for now.
1645 }
1647 void os::print_memory_info(outputStream* st) {
1648 st->print("Memory:");
1649 st->print(" %dk page", os::vm_page_size()>>10);
1651 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1652 // value if total memory is larger than 4GB
1653 MEMORYSTATUSEX ms;
1654 ms.dwLength = sizeof(ms);
1655 GlobalMemoryStatusEx(&ms);
1657 st->print(", physical %uk", os::physical_memory() >> 10);
1658 st->print("(%uk free)", os::available_memory() >> 10);
1660 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1661 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1662 st->cr();
1663 }
1665 void os::print_siginfo(outputStream *st, void *siginfo) {
1666 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1667 st->print("siginfo:");
1668 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1670 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1671 er->NumberParameters >= 2) {
1672 switch (er->ExceptionInformation[0]) {
1673 case 0: st->print(", reading address"); break;
1674 case 1: st->print(", writing address"); break;
1675 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1676 er->ExceptionInformation[0]);
1677 }
1678 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1679 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1680 er->NumberParameters >= 2 && UseSharedSpaces) {
1681 FileMapInfo* mapinfo = FileMapInfo::current_info();
1682 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1683 st->print("\n\nError accessing class data sharing archive." \
1684 " Mapped file inaccessible during execution, " \
1685 " possible disk/network problem.");
1686 }
1687 } else {
1688 int num = er->NumberParameters;
1689 if (num > 0) {
1690 st->print(", ExceptionInformation=");
1691 for (int i = 0; i < num; i++) {
1692 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1693 }
1694 }
1695 }
1696 st->cr();
1697 }
1699 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1700 // do nothing
1701 }
1703 static char saved_jvm_path[MAX_PATH] = {0};
1705 // Find the full path to the current module, jvm.dll or jvm_g.dll
1706 void os::jvm_path(char *buf, jint buflen) {
1707 // Error checking.
1708 if (buflen < MAX_PATH) {
1709 assert(false, "must use a large-enough buffer");
1710 buf[0] = '\0';
1711 return;
1712 }
1713 // Lazy resolve the path to current module.
1714 if (saved_jvm_path[0] != 0) {
1715 strcpy(buf, saved_jvm_path);
1716 return;
1717 }
1719 buf[0] = '\0';
1720 if (Arguments::created_by_gamma_launcher()) {
1721 // Support for the gamma launcher. Check for an
1722 // JAVA_HOME environment variable
1723 // and fix up the path so it looks like
1724 // libjvm.so is installed there (append a fake suffix
1725 // hotspot/libjvm.so).
1726 char* java_home_var = ::getenv("JAVA_HOME");
1727 if (java_home_var != NULL && java_home_var[0] != 0) {
1729 strncpy(buf, java_home_var, buflen);
1731 // determine if this is a legacy image or modules image
1732 // modules image doesn't have "jre" subdirectory
1733 size_t len = strlen(buf);
1734 char* jrebin_p = buf + len;
1735 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1736 if (0 != _access(buf, 0)) {
1737 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1738 }
1739 len = strlen(buf);
1740 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1741 }
1742 }
1744 if(buf[0] == '\0') {
1745 GetModuleFileName(vm_lib_handle, buf, buflen);
1746 }
1747 strcpy(saved_jvm_path, buf);
1748 }
1751 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1752 #ifndef _WIN64
1753 st->print("_");
1754 #endif
1755 }
1758 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1759 #ifndef _WIN64
1760 st->print("@%d", args_size * sizeof(int));
1761 #endif
1762 }
1764 // This method is a copy of JDK's sysGetLastErrorString
1765 // from src/windows/hpi/src/system_md.c
1767 size_t os::lasterror(char* buf, size_t len) {
1768 DWORD errval;
1770 if ((errval = GetLastError()) != 0) {
1771 // DOS error
1772 size_t n = (size_t)FormatMessage(
1773 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1774 NULL,
1775 errval,
1776 0,
1777 buf,
1778 (DWORD)len,
1779 NULL);
1780 if (n > 3) {
1781 // Drop final '.', CR, LF
1782 if (buf[n - 1] == '\n') n--;
1783 if (buf[n - 1] == '\r') n--;
1784 if (buf[n - 1] == '.') n--;
1785 buf[n] = '\0';
1786 }
1787 return n;
1788 }
1790 if (errno != 0) {
1791 // C runtime error that has no corresponding DOS error code
1792 const char* s = strerror(errno);
1793 size_t n = strlen(s);
1794 if (n >= len) n = len - 1;
1795 strncpy(buf, s, n);
1796 buf[n] = '\0';
1797 return n;
1798 }
1800 return 0;
1801 }
1803 int os::get_last_error() {
1804 DWORD error = GetLastError();
1805 if (error == 0)
1806 error = errno;
1807 return (int)error;
1808 }
1810 // sun.misc.Signal
1811 // NOTE that this is a workaround for an apparent kernel bug where if
1812 // a signal handler for SIGBREAK is installed then that signal handler
1813 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1814 // See bug 4416763.
1815 static void (*sigbreakHandler)(int) = NULL;
1817 static void UserHandler(int sig, void *siginfo, void *context) {
1818 os::signal_notify(sig);
1819 // We need to reinstate the signal handler each time...
1820 os::signal(sig, (void*)UserHandler);
1821 }
1823 void* os::user_handler() {
1824 return (void*) UserHandler;
1825 }
1827 void* os::signal(int signal_number, void* handler) {
1828 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1829 void (*oldHandler)(int) = sigbreakHandler;
1830 sigbreakHandler = (void (*)(int)) handler;
1831 return (void*) oldHandler;
1832 } else {
1833 return (void*)::signal(signal_number, (void (*)(int))handler);
1834 }
1835 }
1837 void os::signal_raise(int signal_number) {
1838 raise(signal_number);
1839 }
1841 // The Win32 C runtime library maps all console control events other than ^C
1842 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1843 // logoff, and shutdown events. We therefore install our own console handler
1844 // that raises SIGTERM for the latter cases.
1845 //
1846 static BOOL WINAPI consoleHandler(DWORD event) {
1847 switch(event) {
1848 case CTRL_C_EVENT:
1849 if (is_error_reported()) {
1850 // Ctrl-C is pressed during error reporting, likely because the error
1851 // handler fails to abort. Let VM die immediately.
1852 os::die();
1853 }
1855 os::signal_raise(SIGINT);
1856 return TRUE;
1857 break;
1858 case CTRL_BREAK_EVENT:
1859 if (sigbreakHandler != NULL) {
1860 (*sigbreakHandler)(SIGBREAK);
1861 }
1862 return TRUE;
1863 break;
1864 case CTRL_CLOSE_EVENT:
1865 case CTRL_LOGOFF_EVENT:
1866 case CTRL_SHUTDOWN_EVENT:
1867 os::signal_raise(SIGTERM);
1868 return TRUE;
1869 break;
1870 default:
1871 break;
1872 }
1873 return FALSE;
1874 }
1876 /*
1877 * The following code is moved from os.cpp for making this
1878 * code platform specific, which it is by its very nature.
1879 */
1881 // Return maximum OS signal used + 1 for internal use only
1882 // Used as exit signal for signal_thread
1883 int os::sigexitnum_pd(){
1884 return NSIG;
1885 }
1887 // a counter for each possible signal value, including signal_thread exit signal
1888 static volatile jint pending_signals[NSIG+1] = { 0 };
1889 static HANDLE sig_sem;
1891 void os::signal_init_pd() {
1892 // Initialize signal structures
1893 memset((void*)pending_signals, 0, sizeof(pending_signals));
1895 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1897 // Programs embedding the VM do not want it to attempt to receive
1898 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1899 // shutdown hooks mechanism introduced in 1.3. For example, when
1900 // the VM is run as part of a Windows NT service (i.e., a servlet
1901 // engine in a web server), the correct behavior is for any console
1902 // control handler to return FALSE, not TRUE, because the OS's
1903 // "final" handler for such events allows the process to continue if
1904 // it is a service (while terminating it if it is not a service).
1905 // To make this behavior uniform and the mechanism simpler, we
1906 // completely disable the VM's usage of these console events if -Xrs
1907 // (=ReduceSignalUsage) is specified. This means, for example, that
1908 // the CTRL-BREAK thread dump mechanism is also disabled in this
1909 // case. See bugs 4323062, 4345157, and related bugs.
1911 if (!ReduceSignalUsage) {
1912 // Add a CTRL-C handler
1913 SetConsoleCtrlHandler(consoleHandler, TRUE);
1914 }
1915 }
1917 void os::signal_notify(int signal_number) {
1918 BOOL ret;
1920 Atomic::inc(&pending_signals[signal_number]);
1921 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1922 assert(ret != 0, "ReleaseSemaphore() failed");
1923 }
1925 static int check_pending_signals(bool wait_for_signal) {
1926 DWORD ret;
1927 while (true) {
1928 for (int i = 0; i < NSIG + 1; i++) {
1929 jint n = pending_signals[i];
1930 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1931 return i;
1932 }
1933 }
1934 if (!wait_for_signal) {
1935 return -1;
1936 }
1938 JavaThread *thread = JavaThread::current();
1940 ThreadBlockInVM tbivm(thread);
1942 bool threadIsSuspended;
1943 do {
1944 thread->set_suspend_equivalent();
1945 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1946 ret = ::WaitForSingleObject(sig_sem, INFINITE);
1947 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
1949 // were we externally suspended while we were waiting?
1950 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1951 if (threadIsSuspended) {
1952 //
1953 // The semaphore has been incremented, but while we were waiting
1954 // another thread suspended us. We don't want to continue running
1955 // while suspended because that would surprise the thread that
1956 // suspended us.
1957 //
1958 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
1959 assert(ret != 0, "ReleaseSemaphore() failed");
1961 thread->java_suspend_self();
1962 }
1963 } while (threadIsSuspended);
1964 }
1965 }
1967 int os::signal_lookup() {
1968 return check_pending_signals(false);
1969 }
1971 int os::signal_wait() {
1972 return check_pending_signals(true);
1973 }
1975 // Implicit OS exception handling
1977 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
1978 JavaThread* thread = JavaThread::current();
1979 // Save pc in thread
1980 #ifdef _M_IA64
1981 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->StIIP);
1982 // Set pc to handler
1983 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
1984 #elif _M_AMD64
1985 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Rip);
1986 // Set pc to handler
1987 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
1988 #else
1989 thread->set_saved_exception_pc((address)exceptionInfo->ContextRecord->Eip);
1990 // Set pc to handler
1991 exceptionInfo->ContextRecord->Eip = (LONG)handler;
1992 #endif
1994 // Continue the execution
1995 return EXCEPTION_CONTINUE_EXECUTION;
1996 }
1999 // Used for PostMortemDump
2000 extern "C" void safepoints();
2001 extern "C" void find(int x);
2002 extern "C" void events();
2004 // According to Windows API documentation, an illegal instruction sequence should generate
2005 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2006 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2007 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2009 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2011 // From "Execution Protection in the Windows Operating System" draft 0.35
2012 // Once a system header becomes available, the "real" define should be
2013 // included or copied here.
2014 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2016 #define def_excpt(val) #val, val
2018 struct siglabel {
2019 char *name;
2020 int number;
2021 };
2023 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2024 // C++ compiler contain this error code. Because this is a compiler-generated
2025 // error, the code is not listed in the Win32 API header files.
2026 // The code is actually a cryptic mnemonic device, with the initial "E"
2027 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2028 // ASCII values of "msc".
2030 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2033 struct siglabel exceptlabels[] = {
2034 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2035 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2036 def_excpt(EXCEPTION_BREAKPOINT),
2037 def_excpt(EXCEPTION_SINGLE_STEP),
2038 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2039 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2040 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2041 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2042 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2043 def_excpt(EXCEPTION_FLT_OVERFLOW),
2044 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2045 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2046 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2047 def_excpt(EXCEPTION_INT_OVERFLOW),
2048 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2049 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2050 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2051 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2052 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2053 def_excpt(EXCEPTION_STACK_OVERFLOW),
2054 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2055 def_excpt(EXCEPTION_GUARD_PAGE),
2056 def_excpt(EXCEPTION_INVALID_HANDLE),
2057 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2058 NULL, 0
2059 };
2061 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2062 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2063 if (exceptlabels[i].number == exception_code) {
2064 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2065 return buf;
2066 }
2067 }
2069 return NULL;
2070 }
2072 //-----------------------------------------------------------------------------
2073 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2074 // handle exception caused by idiv; should only happen for -MinInt/-1
2075 // (division by zero is handled explicitly)
2076 #ifdef _M_IA64
2077 assert(0, "Fix Handle_IDiv_Exception");
2078 #elif _M_AMD64
2079 PCONTEXT ctx = exceptionInfo->ContextRecord;
2080 address pc = (address)ctx->Rip;
2081 assert(pc[0] == 0xF7, "not an idiv opcode");
2082 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2083 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2084 // set correct result values and continue after idiv instruction
2085 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2086 ctx->Rax = (DWORD)min_jint; // result
2087 ctx->Rdx = (DWORD)0; // remainder
2088 // Continue the execution
2089 #else
2090 PCONTEXT ctx = exceptionInfo->ContextRecord;
2091 address pc = (address)ctx->Eip;
2092 assert(pc[0] == 0xF7, "not an idiv opcode");
2093 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2094 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2095 // set correct result values and continue after idiv instruction
2096 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2097 ctx->Eax = (DWORD)min_jint; // result
2098 ctx->Edx = (DWORD)0; // remainder
2099 // Continue the execution
2100 #endif
2101 return EXCEPTION_CONTINUE_EXECUTION;
2102 }
2104 #ifndef _WIN64
2105 //-----------------------------------------------------------------------------
2106 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2107 // handle exception caused by native method modifying control word
2108 PCONTEXT ctx = exceptionInfo->ContextRecord;
2109 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2111 switch (exception_code) {
2112 case EXCEPTION_FLT_DENORMAL_OPERAND:
2113 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2114 case EXCEPTION_FLT_INEXACT_RESULT:
2115 case EXCEPTION_FLT_INVALID_OPERATION:
2116 case EXCEPTION_FLT_OVERFLOW:
2117 case EXCEPTION_FLT_STACK_CHECK:
2118 case EXCEPTION_FLT_UNDERFLOW:
2119 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2120 if (fp_control_word != ctx->FloatSave.ControlWord) {
2121 // Restore FPCW and mask out FLT exceptions
2122 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2123 // Mask out pending FLT exceptions
2124 ctx->FloatSave.StatusWord &= 0xffffff00;
2125 return EXCEPTION_CONTINUE_EXECUTION;
2126 }
2127 }
2129 if (prev_uef_handler != NULL) {
2130 // We didn't handle this exception so pass it to the previous
2131 // UnhandledExceptionFilter.
2132 return (prev_uef_handler)(exceptionInfo);
2133 }
2135 return EXCEPTION_CONTINUE_SEARCH;
2136 }
2137 #else //_WIN64
2138 /*
2139 On Windows, the mxcsr control bits are non-volatile across calls
2140 See also CR 6192333
2141 If EXCEPTION_FLT_* happened after some native method modified
2142 mxcsr - it is not a jvm fault.
2143 However should we decide to restore of mxcsr after a faulty
2144 native method we can uncomment following code
2145 jint MxCsr = INITIAL_MXCSR;
2146 // we can't use StubRoutines::addr_mxcsr_std()
2147 // because in Win64 mxcsr is not saved there
2148 if (MxCsr != ctx->MxCsr) {
2149 ctx->MxCsr = MxCsr;
2150 return EXCEPTION_CONTINUE_EXECUTION;
2151 }
2153 */
2154 #endif //_WIN64
2157 // Fatal error reporting is single threaded so we can make this a
2158 // static and preallocated. If it's more than MAX_PATH silently ignore
2159 // it.
2160 static char saved_error_file[MAX_PATH] = {0};
2162 void os::set_error_file(const char *logfile) {
2163 if (strlen(logfile) <= MAX_PATH) {
2164 strncpy(saved_error_file, logfile, MAX_PATH);
2165 }
2166 }
2168 static inline void report_error(Thread* t, DWORD exception_code,
2169 address addr, void* siginfo, void* context) {
2170 VMError err(t, exception_code, addr, siginfo, context);
2171 err.report_and_die();
2173 // If UseOsErrorReporting, this will return here and save the error file
2174 // somewhere where we can find it in the minidump.
2175 }
2177 //-----------------------------------------------------------------------------
2178 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2179 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2180 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2181 #ifdef _M_IA64
2182 address pc = (address) exceptionInfo->ContextRecord->StIIP;
2183 #elif _M_AMD64
2184 address pc = (address) exceptionInfo->ContextRecord->Rip;
2185 #else
2186 address pc = (address) exceptionInfo->ContextRecord->Eip;
2187 #endif
2188 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2190 #ifndef _WIN64
2191 // Execution protection violation - win32 running on AMD64 only
2192 // Handled first to avoid misdiagnosis as a "normal" access violation;
2193 // This is safe to do because we have a new/unique ExceptionInformation
2194 // code for this condition.
2195 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2196 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2197 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2198 address addr = (address) exceptionRecord->ExceptionInformation[1];
2200 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2201 int page_size = os::vm_page_size();
2203 // Make sure the pc and the faulting address are sane.
2204 //
2205 // If an instruction spans a page boundary, and the page containing
2206 // the beginning of the instruction is executable but the following
2207 // page is not, the pc and the faulting address might be slightly
2208 // different - we still want to unguard the 2nd page in this case.
2209 //
2210 // 15 bytes seems to be a (very) safe value for max instruction size.
2211 bool pc_is_near_addr =
2212 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2213 bool instr_spans_page_boundary =
2214 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2215 (intptr_t) page_size) > 0);
2217 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2218 static volatile address last_addr =
2219 (address) os::non_memory_address_word();
2221 // In conservative mode, don't unguard unless the address is in the VM
2222 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2223 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2225 // Set memory to RWX and retry
2226 address page_start =
2227 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2228 bool res = os::protect_memory((char*) page_start, page_size,
2229 os::MEM_PROT_RWX);
2231 if (PrintMiscellaneous && Verbose) {
2232 char buf[256];
2233 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2234 "at " INTPTR_FORMAT
2235 ", unguarding " INTPTR_FORMAT ": %s", addr,
2236 page_start, (res ? "success" : strerror(errno)));
2237 tty->print_raw_cr(buf);
2238 }
2240 // Set last_addr so if we fault again at the same address, we don't
2241 // end up in an endless loop.
2242 //
2243 // There are two potential complications here. Two threads trapping
2244 // at the same address at the same time could cause one of the
2245 // threads to think it already unguarded, and abort the VM. Likely
2246 // very rare.
2247 //
2248 // The other race involves two threads alternately trapping at
2249 // different addresses and failing to unguard the page, resulting in
2250 // an endless loop. This condition is probably even more unlikely
2251 // than the first.
2252 //
2253 // Although both cases could be avoided by using locks or thread
2254 // local last_addr, these solutions are unnecessary complication:
2255 // this handler is a best-effort safety net, not a complete solution.
2256 // It is disabled by default and should only be used as a workaround
2257 // in case we missed any no-execute-unsafe VM code.
2259 last_addr = addr;
2261 return EXCEPTION_CONTINUE_EXECUTION;
2262 }
2263 }
2265 // Last unguard failed or not unguarding
2266 tty->print_raw_cr("Execution protection violation");
2267 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2268 exceptionInfo->ContextRecord);
2269 return EXCEPTION_CONTINUE_SEARCH;
2270 }
2271 }
2272 #endif // _WIN64
2274 // Check to see if we caught the safepoint code in the
2275 // process of write protecting the memory serialization page.
2276 // It write enables the page immediately after protecting it
2277 // so just return.
2278 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2279 JavaThread* thread = (JavaThread*) t;
2280 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2281 address addr = (address) exceptionRecord->ExceptionInformation[1];
2282 if ( os::is_memory_serialize_page(thread, addr) ) {
2283 // Block current thread until the memory serialize page permission restored.
2284 os::block_on_serialize_page_trap();
2285 return EXCEPTION_CONTINUE_EXECUTION;
2286 }
2287 }
2289 if (t != NULL && t->is_Java_thread()) {
2290 JavaThread* thread = (JavaThread*) t;
2291 bool in_java = thread->thread_state() == _thread_in_Java;
2293 // Handle potential stack overflows up front.
2294 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2295 if (os::uses_stack_guard_pages()) {
2296 #ifdef _M_IA64
2297 //
2298 // If it's a legal stack address continue, Windows will map it in.
2299 //
2300 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2301 address addr = (address) exceptionRecord->ExceptionInformation[1];
2302 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() )
2303 return EXCEPTION_CONTINUE_EXECUTION;
2305 // The register save area is the same size as the memory stack
2306 // and starts at the page just above the start of the memory stack.
2307 // If we get a fault in this area, we've run out of register
2308 // stack. If we are in java, try throwing a stack overflow exception.
2309 if (addr > thread->stack_base() &&
2310 addr <= (thread->stack_base()+thread->stack_size()) ) {
2311 char buf[256];
2312 jio_snprintf(buf, sizeof(buf),
2313 "Register stack overflow, addr:%p, stack_base:%p\n",
2314 addr, thread->stack_base() );
2315 tty->print_raw_cr(buf);
2316 // If not in java code, return and hope for the best.
2317 return in_java ? Handle_Exception(exceptionInfo,
2318 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2319 : EXCEPTION_CONTINUE_EXECUTION;
2320 }
2321 #endif
2322 if (thread->stack_yellow_zone_enabled()) {
2323 // Yellow zone violation. The o/s has unprotected the first yellow
2324 // zone page for us. Note: must call disable_stack_yellow_zone to
2325 // update the enabled status, even if the zone contains only one page.
2326 thread->disable_stack_yellow_zone();
2327 // If not in java code, return and hope for the best.
2328 return in_java ? Handle_Exception(exceptionInfo,
2329 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2330 : EXCEPTION_CONTINUE_EXECUTION;
2331 } else {
2332 // Fatal red zone violation.
2333 thread->disable_stack_red_zone();
2334 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2335 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2336 exceptionInfo->ContextRecord);
2337 return EXCEPTION_CONTINUE_SEARCH;
2338 }
2339 } else if (in_java) {
2340 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2341 // a one-time-only guard page, which it has released to us. The next
2342 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2343 return Handle_Exception(exceptionInfo,
2344 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2345 } else {
2346 // Can only return and hope for the best. Further stack growth will
2347 // result in an ACCESS_VIOLATION.
2348 return EXCEPTION_CONTINUE_EXECUTION;
2349 }
2350 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2351 // Either stack overflow or null pointer exception.
2352 if (in_java) {
2353 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2354 address addr = (address) exceptionRecord->ExceptionInformation[1];
2355 address stack_end = thread->stack_base() - thread->stack_size();
2356 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2357 // Stack overflow.
2358 assert(!os::uses_stack_guard_pages(),
2359 "should be caught by red zone code above.");
2360 return Handle_Exception(exceptionInfo,
2361 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2362 }
2363 //
2364 // Check for safepoint polling and implicit null
2365 // We only expect null pointers in the stubs (vtable)
2366 // the rest are checked explicitly now.
2367 //
2368 CodeBlob* cb = CodeCache::find_blob(pc);
2369 if (cb != NULL) {
2370 if (os::is_poll_address(addr)) {
2371 address stub = SharedRuntime::get_poll_stub(pc);
2372 return Handle_Exception(exceptionInfo, stub);
2373 }
2374 }
2375 {
2376 #ifdef _WIN64
2377 //
2378 // If it's a legal stack address map the entire region in
2379 //
2380 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2381 address addr = (address) exceptionRecord->ExceptionInformation[1];
2382 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2383 addr = (address)((uintptr_t)addr &
2384 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2385 os::commit_memory((char *)addr, thread->stack_base() - addr,
2386 false );
2387 return EXCEPTION_CONTINUE_EXECUTION;
2388 }
2389 else
2390 #endif
2391 {
2392 // Null pointer exception.
2393 #ifdef _M_IA64
2394 // We catch register stack overflows in compiled code by doing
2395 // an explicit compare and executing a st8(G0, G0) if the
2396 // BSP enters into our guard area. We test for the overflow
2397 // condition and fall into the normal null pointer exception
2398 // code if BSP hasn't overflowed.
2399 if ( in_java ) {
2400 if(thread->register_stack_overflow()) {
2401 assert((address)exceptionInfo->ContextRecord->IntS3 ==
2402 thread->register_stack_limit(),
2403 "GR7 doesn't contain register_stack_limit");
2404 // Disable the yellow zone which sets the state that
2405 // we've got a stack overflow problem.
2406 if (thread->stack_yellow_zone_enabled()) {
2407 thread->disable_stack_yellow_zone();
2408 }
2409 // Give us some room to process the exception
2410 thread->disable_register_stack_guard();
2411 // Update GR7 with the new limit so we can continue running
2412 // compiled code.
2413 exceptionInfo->ContextRecord->IntS3 =
2414 (ULONGLONG)thread->register_stack_limit();
2415 return Handle_Exception(exceptionInfo,
2416 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2417 } else {
2418 //
2419 // Check for implicit null
2420 // We only expect null pointers in the stubs (vtable)
2421 // the rest are checked explicitly now.
2422 //
2423 if (((uintptr_t)addr) < os::vm_page_size() ) {
2424 // an access to the first page of VM--assume it is a null pointer
2425 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2426 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2427 }
2428 }
2429 } // in_java
2431 // IA64 doesn't use implicit null checking yet. So we shouldn't
2432 // get here.
2433 tty->print_raw_cr("Access violation, possible null pointer exception");
2434 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2435 exceptionInfo->ContextRecord);
2436 return EXCEPTION_CONTINUE_SEARCH;
2437 #else /* !IA64 */
2439 // Windows 98 reports faulting addresses incorrectly
2440 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2441 !os::win32::is_nt()) {
2442 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2443 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2444 }
2445 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2446 exceptionInfo->ContextRecord);
2447 return EXCEPTION_CONTINUE_SEARCH;
2448 #endif
2449 }
2450 }
2451 }
2453 #ifdef _WIN64
2454 // Special care for fast JNI field accessors.
2455 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2456 // in and the heap gets shrunk before the field access.
2457 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2458 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2459 if (addr != (address)-1) {
2460 return Handle_Exception(exceptionInfo, addr);
2461 }
2462 }
2463 #endif
2465 #ifdef _WIN64
2466 // Windows will sometimes generate an access violation
2467 // when we call malloc. Since we use VectoredExceptions
2468 // on 64 bit platforms, we see this exception. We must
2469 // pass this exception on so Windows can recover.
2470 // We check to see if the pc of the fault is in NTDLL.DLL
2471 // if so, we pass control on to Windows for handling.
2472 if (UseVectoredExceptions && _addr_in_ntdll(pc)) return EXCEPTION_CONTINUE_SEARCH;
2473 #endif
2475 // Stack overflow or null pointer exception in native code.
2476 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2477 exceptionInfo->ContextRecord);
2478 return EXCEPTION_CONTINUE_SEARCH;
2479 }
2481 if (in_java) {
2482 switch (exception_code) {
2483 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2484 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2486 case EXCEPTION_INT_OVERFLOW:
2487 return Handle_IDiv_Exception(exceptionInfo);
2489 } // switch
2490 }
2491 #ifndef _WIN64
2492 if (((thread->thread_state() == _thread_in_Java) ||
2493 (thread->thread_state() == _thread_in_native)) &&
2494 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2495 {
2496 LONG result=Handle_FLT_Exception(exceptionInfo);
2497 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2498 }
2499 #endif //_WIN64
2500 }
2502 if (exception_code != EXCEPTION_BREAKPOINT) {
2503 #ifndef _WIN64
2504 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2505 exceptionInfo->ContextRecord);
2506 #else
2507 // Itanium Windows uses a VectoredExceptionHandler
2508 // Which means that C++ programatic exception handlers (try/except)
2509 // will get here. Continue the search for the right except block if
2510 // the exception code is not a fatal code.
2511 switch ( exception_code ) {
2512 case EXCEPTION_ACCESS_VIOLATION:
2513 case EXCEPTION_STACK_OVERFLOW:
2514 case EXCEPTION_ILLEGAL_INSTRUCTION:
2515 case EXCEPTION_ILLEGAL_INSTRUCTION_2:
2516 case EXCEPTION_INT_OVERFLOW:
2517 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2518 case EXCEPTION_UNCAUGHT_CXX_EXCEPTION:
2519 { report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2520 exceptionInfo->ContextRecord);
2521 }
2522 break;
2523 default:
2524 break;
2525 }
2526 #endif
2527 }
2528 return EXCEPTION_CONTINUE_SEARCH;
2529 }
2531 #ifndef _WIN64
2532 // Special care for fast JNI accessors.
2533 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2534 // the heap gets shrunk before the field access.
2535 // Need to install our own structured exception handler since native code may
2536 // install its own.
2537 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2538 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2539 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2540 address pc = (address) exceptionInfo->ContextRecord->Eip;
2541 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2542 if (addr != (address)-1) {
2543 return Handle_Exception(exceptionInfo, addr);
2544 }
2545 }
2546 return EXCEPTION_CONTINUE_SEARCH;
2547 }
2549 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2550 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2551 __try { \
2552 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2553 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2554 } \
2555 return 0; \
2556 }
2558 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2559 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2560 DEFINE_FAST_GETFIELD(jchar, char, Char)
2561 DEFINE_FAST_GETFIELD(jshort, short, Short)
2562 DEFINE_FAST_GETFIELD(jint, int, Int)
2563 DEFINE_FAST_GETFIELD(jlong, long, Long)
2564 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2565 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2567 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2568 switch (type) {
2569 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2570 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2571 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2572 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2573 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2574 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2575 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2576 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2577 default: ShouldNotReachHere();
2578 }
2579 return (address)-1;
2580 }
2581 #endif
2583 // Virtual Memory
2585 int os::vm_page_size() { return os::win32::vm_page_size(); }
2586 int os::vm_allocation_granularity() {
2587 return os::win32::vm_allocation_granularity();
2588 }
2590 // Windows large page support is available on Windows 2003. In order to use
2591 // large page memory, the administrator must first assign additional privilege
2592 // to the user:
2593 // + select Control Panel -> Administrative Tools -> Local Security Policy
2594 // + select Local Policies -> User Rights Assignment
2595 // + double click "Lock pages in memory", add users and/or groups
2596 // + reboot
2597 // Note the above steps are needed for administrator as well, as administrators
2598 // by default do not have the privilege to lock pages in memory.
2599 //
2600 // Note about Windows 2003: although the API supports committing large page
2601 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2602 // scenario, I found through experiment it only uses large page if the entire
2603 // memory region is reserved and committed in a single VirtualAlloc() call.
2604 // This makes Windows large page support more or less like Solaris ISM, in
2605 // that the entire heap must be committed upfront. This probably will change
2606 // in the future, if so the code below needs to be revisited.
2608 #ifndef MEM_LARGE_PAGES
2609 #define MEM_LARGE_PAGES 0x20000000
2610 #endif
2612 static HANDLE _hProcess;
2613 static HANDLE _hToken;
2615 // Container for NUMA node list info
2616 class NUMANodeListHolder {
2617 private:
2618 int *_numa_used_node_list; // allocated below
2619 int _numa_used_node_count;
2621 void free_node_list() {
2622 if (_numa_used_node_list != NULL) {
2623 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2624 }
2625 }
2627 public:
2628 NUMANodeListHolder() {
2629 _numa_used_node_count = 0;
2630 _numa_used_node_list = NULL;
2631 // do rest of initialization in build routine (after function pointers are set up)
2632 }
2634 ~NUMANodeListHolder() {
2635 free_node_list();
2636 }
2638 bool build() {
2639 DWORD_PTR proc_aff_mask;
2640 DWORD_PTR sys_aff_mask;
2641 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2642 ULONG highest_node_number;
2643 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2644 free_node_list();
2645 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1);
2646 for (unsigned int i = 0; i <= highest_node_number; i++) {
2647 ULONGLONG proc_mask_numa_node;
2648 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2649 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2650 _numa_used_node_list[_numa_used_node_count++] = i;
2651 }
2652 }
2653 return (_numa_used_node_count > 1);
2654 }
2656 int get_count() {return _numa_used_node_count;}
2657 int get_node_list_entry(int n) {
2658 // for indexes out of range, returns -1
2659 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2660 }
2662 } numa_node_list_holder;
2666 static size_t _large_page_size = 0;
2668 static bool resolve_functions_for_large_page_init() {
2669 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2670 os::Advapi32Dll::AdvapiAvailable();
2671 }
2673 static bool request_lock_memory_privilege() {
2674 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2675 os::current_process_id());
2677 LUID luid;
2678 if (_hProcess != NULL &&
2679 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2680 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2682 TOKEN_PRIVILEGES tp;
2683 tp.PrivilegeCount = 1;
2684 tp.Privileges[0].Luid = luid;
2685 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2687 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2688 // privilege. Check GetLastError() too. See MSDN document.
2689 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2690 (GetLastError() == ERROR_SUCCESS)) {
2691 return true;
2692 }
2693 }
2695 return false;
2696 }
2698 static void cleanup_after_large_page_init() {
2699 if (_hProcess) CloseHandle(_hProcess);
2700 _hProcess = NULL;
2701 if (_hToken) CloseHandle(_hToken);
2702 _hToken = NULL;
2703 }
2705 static bool numa_interleaving_init() {
2706 bool success = false;
2707 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2709 // print a warning if UseNUMAInterleaving flag is specified on command line
2710 bool warn_on_failure = use_numa_interleaving_specified;
2711 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2713 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2714 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2715 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2717 if (os::Kernel32Dll::NumaCallsAvailable()) {
2718 if (numa_node_list_holder.build()) {
2719 if (PrintMiscellaneous && Verbose) {
2720 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2721 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2722 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2723 }
2724 tty->print("\n");
2725 }
2726 success = true;
2727 } else {
2728 WARN("Process does not cover multiple NUMA nodes.");
2729 }
2730 } else {
2731 WARN("NUMA Interleaving is not supported by the operating system.");
2732 }
2733 if (!success) {
2734 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2735 }
2736 return success;
2737 #undef WARN
2738 }
2740 // this routine is used whenever we need to reserve a contiguous VA range
2741 // but we need to make separate VirtualAlloc calls for each piece of the range
2742 // Reasons for doing this:
2743 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2744 // * UseNUMAInterleaving requires a separate node for each piece
2745 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2746 bool should_inject_error=false) {
2747 char * p_buf;
2748 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2749 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2750 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2752 // first reserve enough address space in advance since we want to be
2753 // able to break a single contiguous virtual address range into multiple
2754 // large page commits but WS2003 does not allow reserving large page space
2755 // so we just use 4K pages for reserve, this gives us a legal contiguous
2756 // address space. then we will deallocate that reservation, and re alloc
2757 // using large pages
2758 const size_t size_of_reserve = bytes + chunk_size;
2759 if (bytes > size_of_reserve) {
2760 // Overflowed.
2761 return NULL;
2762 }
2763 p_buf = (char *) VirtualAlloc(addr,
2764 size_of_reserve, // size of Reserve
2765 MEM_RESERVE,
2766 PAGE_READWRITE);
2767 // If reservation failed, return NULL
2768 if (p_buf == NULL) return NULL;
2770 os::release_memory(p_buf, bytes + chunk_size);
2772 // we still need to round up to a page boundary (in case we are using large pages)
2773 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2774 // instead we handle this in the bytes_to_rq computation below
2775 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2777 // now go through and allocate one chunk at a time until all bytes are
2778 // allocated
2779 size_t bytes_remaining = bytes;
2780 // An overflow of align_size_up() would have been caught above
2781 // in the calculation of size_of_reserve.
2782 char * next_alloc_addr = p_buf;
2783 HANDLE hProc = GetCurrentProcess();
2785 #ifdef ASSERT
2786 // Variable for the failure injection
2787 long ran_num = os::random();
2788 size_t fail_after = ran_num % bytes;
2789 #endif
2791 int count=0;
2792 while (bytes_remaining) {
2793 // select bytes_to_rq to get to the next chunk_size boundary
2795 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2796 // Note allocate and commit
2797 char * p_new;
2799 #ifdef ASSERT
2800 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2801 #else
2802 const bool inject_error_now = false;
2803 #endif
2805 if (inject_error_now) {
2806 p_new = NULL;
2807 } else {
2808 if (!UseNUMAInterleaving) {
2809 p_new = (char *) VirtualAlloc(next_alloc_addr,
2810 bytes_to_rq,
2811 flags,
2812 prot);
2813 } else {
2814 // get the next node to use from the used_node_list
2815 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2816 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2817 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2818 next_alloc_addr,
2819 bytes_to_rq,
2820 flags,
2821 prot,
2822 node);
2823 }
2824 }
2826 if (p_new == NULL) {
2827 // Free any allocated pages
2828 if (next_alloc_addr > p_buf) {
2829 // Some memory was committed so release it.
2830 size_t bytes_to_release = bytes - bytes_remaining;
2831 os::release_memory(p_buf, bytes_to_release);
2832 }
2833 #ifdef ASSERT
2834 if (should_inject_error) {
2835 if (TracePageSizes && Verbose) {
2836 tty->print_cr("Reserving pages individually failed.");
2837 }
2838 }
2839 #endif
2840 return NULL;
2841 }
2842 bytes_remaining -= bytes_to_rq;
2843 next_alloc_addr += bytes_to_rq;
2844 count++;
2845 }
2846 // made it this far, success
2847 return p_buf;
2848 }
2852 void os::large_page_init() {
2853 if (!UseLargePages) return;
2855 // print a warning if any large page related flag is specified on command line
2856 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2857 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2858 bool success = false;
2860 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2861 if (resolve_functions_for_large_page_init()) {
2862 if (request_lock_memory_privilege()) {
2863 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2864 if (s) {
2865 #if defined(IA32) || defined(AMD64)
2866 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2867 WARN("JVM cannot use large pages bigger than 4mb.");
2868 } else {
2869 #endif
2870 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2871 _large_page_size = LargePageSizeInBytes;
2872 } else {
2873 _large_page_size = s;
2874 }
2875 success = true;
2876 #if defined(IA32) || defined(AMD64)
2877 }
2878 #endif
2879 } else {
2880 WARN("Large page is not supported by the processor.");
2881 }
2882 } else {
2883 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2884 }
2885 } else {
2886 WARN("Large page is not supported by the operating system.");
2887 }
2888 #undef WARN
2890 const size_t default_page_size = (size_t) vm_page_size();
2891 if (success && _large_page_size > default_page_size) {
2892 _page_sizes[0] = _large_page_size;
2893 _page_sizes[1] = default_page_size;
2894 _page_sizes[2] = 0;
2895 }
2897 cleanup_after_large_page_init();
2898 UseLargePages = success;
2899 }
2901 // On win32, one cannot release just a part of reserved memory, it's an
2902 // all or nothing deal. When we split a reservation, we must break the
2903 // reservation into two reservations.
2904 void os::split_reserved_memory(char *base, size_t size, size_t split,
2905 bool realloc) {
2906 if (size > 0) {
2907 release_memory(base, size);
2908 if (realloc) {
2909 reserve_memory(split, base);
2910 }
2911 if (size != split) {
2912 reserve_memory(size - split, base + split);
2913 }
2914 }
2915 }
2917 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
2918 assert((size_t)addr % os::vm_allocation_granularity() == 0,
2919 "reserve alignment");
2920 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
2921 char* res;
2922 // note that if UseLargePages is on, all the areas that require interleaving
2923 // will go thru reserve_memory_special rather than thru here.
2924 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
2925 if (!use_individual) {
2926 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
2927 } else {
2928 elapsedTimer reserveTimer;
2929 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
2930 // in numa interleaving, we have to allocate pages individually
2931 // (well really chunks of NUMAInterleaveGranularity size)
2932 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
2933 if (res == NULL) {
2934 warning("NUMA page allocation failed");
2935 }
2936 if( Verbose && PrintMiscellaneous ) {
2937 reserveTimer.stop();
2938 tty->print_cr("reserve_memory of %Ix bytes took %ld ms (%ld ticks)", bytes,
2939 reserveTimer.milliseconds(), reserveTimer.ticks());
2940 }
2941 }
2942 assert(res == NULL || addr == NULL || addr == res,
2943 "Unexpected address from reserve.");
2945 return res;
2946 }
2948 // Reserve memory at an arbitrary address, only if that area is
2949 // available (and not reserved for something else).
2950 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2951 // Windows os::reserve_memory() fails of the requested address range is
2952 // not avilable.
2953 return reserve_memory(bytes, requested_addr);
2954 }
2956 size_t os::large_page_size() {
2957 return _large_page_size;
2958 }
2960 bool os::can_commit_large_page_memory() {
2961 // Windows only uses large page memory when the entire region is reserved
2962 // and committed in a single VirtualAlloc() call. This may change in the
2963 // future, but with Windows 2003 it's not possible to commit on demand.
2964 return false;
2965 }
2967 bool os::can_execute_large_page_memory() {
2968 return true;
2969 }
2971 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
2973 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
2974 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
2976 // with large pages, there are two cases where we need to use Individual Allocation
2977 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
2978 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
2979 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
2980 if (TracePageSizes && Verbose) {
2981 tty->print_cr("Reserving large pages individually.");
2982 }
2983 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
2984 if (p_buf == NULL) {
2985 // give an appropriate warning message
2986 if (UseNUMAInterleaving) {
2987 warning("NUMA large page allocation failed, UseLargePages flag ignored");
2988 }
2989 if (UseLargePagesIndividualAllocation) {
2990 warning("Individually allocated large pages failed, "
2991 "use -XX:-UseLargePagesIndividualAllocation to turn off");
2992 }
2993 return NULL;
2994 }
2996 return p_buf;
2998 } else {
2999 // normal policy just allocate it all at once
3000 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3001 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3002 return res;
3003 }
3004 }
3006 bool os::release_memory_special(char* base, size_t bytes) {
3007 return release_memory(base, bytes);
3008 }
3010 void os::print_statistics() {
3011 }
3013 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
3014 if (bytes == 0) {
3015 // Don't bother the OS with noops.
3016 return true;
3017 }
3018 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3019 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3020 // Don't attempt to print anything if the OS call fails. We're
3021 // probably low on resources, so the print itself may cause crashes.
3023 // unless we have NUMAInterleaving enabled, the range of a commit
3024 // is always within a reserve covered by a single VirtualAlloc
3025 // in that case we can just do a single commit for the requested size
3026 if (!UseNUMAInterleaving) {
3027 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) return false;
3028 if (exec) {
3029 DWORD oldprot;
3030 // Windows doc says to use VirtualProtect to get execute permissions
3031 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) return false;
3032 }
3033 return true;
3034 } else {
3036 // when NUMAInterleaving is enabled, the commit might cover a range that
3037 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3038 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3039 // returns represents the number of bytes that can be committed in one step.
3040 size_t bytes_remaining = bytes;
3041 char * next_alloc_addr = addr;
3042 while (bytes_remaining > 0) {
3043 MEMORY_BASIC_INFORMATION alloc_info;
3044 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3045 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3046 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT, PAGE_READWRITE) == NULL)
3047 return false;
3048 if (exec) {
3049 DWORD oldprot;
3050 if (!VirtualProtect(next_alloc_addr, bytes_to_rq, PAGE_EXECUTE_READWRITE, &oldprot))
3051 return false;
3052 }
3053 bytes_remaining -= bytes_to_rq;
3054 next_alloc_addr += bytes_to_rq;
3055 }
3056 }
3057 // if we made it this far, return true
3058 return true;
3059 }
3061 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint,
3062 bool exec) {
3063 return commit_memory(addr, size, exec);
3064 }
3066 bool os::uncommit_memory(char* addr, size_t bytes) {
3067 if (bytes == 0) {
3068 // Don't bother the OS with noops.
3069 return true;
3070 }
3071 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3072 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3073 return VirtualFree(addr, bytes, MEM_DECOMMIT) != 0;
3074 }
3076 bool os::release_memory(char* addr, size_t bytes) {
3077 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3078 }
3080 bool os::create_stack_guard_pages(char* addr, size_t size) {
3081 return os::commit_memory(addr, size);
3082 }
3084 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3085 return os::uncommit_memory(addr, size);
3086 }
3088 // Set protections specified
3089 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3090 bool is_committed) {
3091 unsigned int p = 0;
3092 switch (prot) {
3093 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3094 case MEM_PROT_READ: p = PAGE_READONLY; break;
3095 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3096 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3097 default:
3098 ShouldNotReachHere();
3099 }
3101 DWORD old_status;
3103 // Strange enough, but on Win32 one can change protection only for committed
3104 // memory, not a big deal anyway, as bytes less or equal than 64K
3105 if (!is_committed && !commit_memory(addr, bytes, prot == MEM_PROT_RWX)) {
3106 fatal("cannot commit protection page");
3107 }
3108 // One cannot use os::guard_memory() here, as on Win32 guard page
3109 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3110 //
3111 // Pages in the region become guard pages. Any attempt to access a guard page
3112 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3113 // the guard page status. Guard pages thus act as a one-time access alarm.
3114 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3115 }
3117 bool os::guard_memory(char* addr, size_t bytes) {
3118 DWORD old_status;
3119 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3120 }
3122 bool os::unguard_memory(char* addr, size_t bytes) {
3123 DWORD old_status;
3124 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3125 }
3127 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3128 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3129 void os::numa_make_global(char *addr, size_t bytes) { }
3130 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3131 bool os::numa_topology_changed() { return false; }
3132 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3133 int os::numa_get_group_id() { return 0; }
3134 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3135 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3136 // Provide an answer for UMA systems
3137 ids[0] = 0;
3138 return 1;
3139 } else {
3140 // check for size bigger than actual groups_num
3141 size = MIN2(size, numa_get_groups_num());
3142 for (int i = 0; i < (int)size; i++) {
3143 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3144 }
3145 return size;
3146 }
3147 }
3149 bool os::get_page_info(char *start, page_info* info) {
3150 return false;
3151 }
3153 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3154 return end;
3155 }
3157 char* os::non_memory_address_word() {
3158 // Must never look like an address returned by reserve_memory,
3159 // even in its subfields (as defined by the CPU immediate fields,
3160 // if the CPU splits constants across multiple instructions).
3161 return (char*)-1;
3162 }
3164 #define MAX_ERROR_COUNT 100
3165 #define SYS_THREAD_ERROR 0xffffffffUL
3167 void os::pd_start_thread(Thread* thread) {
3168 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3169 // Returns previous suspend state:
3170 // 0: Thread was not suspended
3171 // 1: Thread is running now
3172 // >1: Thread is still suspended.
3173 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3174 }
3176 class HighResolutionInterval {
3177 // The default timer resolution seems to be 10 milliseconds.
3178 // (Where is this written down?)
3179 // If someone wants to sleep for only a fraction of the default,
3180 // then we set the timer resolution down to 1 millisecond for
3181 // the duration of their interval.
3182 // We carefully set the resolution back, since otherwise we
3183 // seem to incur an overhead (3%?) that we don't need.
3184 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3185 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3186 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3187 // timeBeginPeriod() if the relative error exceeded some threshold.
3188 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3189 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3190 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3191 // resolution timers running.
3192 private:
3193 jlong resolution;
3194 public:
3195 HighResolutionInterval(jlong ms) {
3196 resolution = ms % 10L;
3197 if (resolution != 0) {
3198 MMRESULT result = timeBeginPeriod(1L);
3199 }
3200 }
3201 ~HighResolutionInterval() {
3202 if (resolution != 0) {
3203 MMRESULT result = timeEndPeriod(1L);
3204 }
3205 resolution = 0L;
3206 }
3207 };
3209 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3210 jlong limit = (jlong) MAXDWORD;
3212 while(ms > limit) {
3213 int res;
3214 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3215 return res;
3216 ms -= limit;
3217 }
3219 assert(thread == Thread::current(), "thread consistency check");
3220 OSThread* osthread = thread->osthread();
3221 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3222 int result;
3223 if (interruptable) {
3224 assert(thread->is_Java_thread(), "must be java thread");
3225 JavaThread *jt = (JavaThread *) thread;
3226 ThreadBlockInVM tbivm(jt);
3228 jt->set_suspend_equivalent();
3229 // cleared by handle_special_suspend_equivalent_condition() or
3230 // java_suspend_self() via check_and_wait_while_suspended()
3232 HANDLE events[1];
3233 events[0] = osthread->interrupt_event();
3234 HighResolutionInterval *phri=NULL;
3235 if(!ForceTimeHighResolution)
3236 phri = new HighResolutionInterval( ms );
3237 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3238 result = OS_TIMEOUT;
3239 } else {
3240 ResetEvent(osthread->interrupt_event());
3241 osthread->set_interrupted(false);
3242 result = OS_INTRPT;
3243 }
3244 delete phri; //if it is NULL, harmless
3246 // were we externally suspended while we were waiting?
3247 jt->check_and_wait_while_suspended();
3248 } else {
3249 assert(!thread->is_Java_thread(), "must not be java thread");
3250 Sleep((long) ms);
3251 result = OS_TIMEOUT;
3252 }
3253 return result;
3254 }
3256 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3257 void os::infinite_sleep() {
3258 while (true) { // sleep forever ...
3259 Sleep(100000); // ... 100 seconds at a time
3260 }
3261 }
3263 typedef BOOL (WINAPI * STTSignature)(void) ;
3265 os::YieldResult os::NakedYield() {
3266 // Use either SwitchToThread() or Sleep(0)
3267 // Consider passing back the return value from SwitchToThread().
3268 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3269 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3270 } else {
3271 Sleep(0);
3272 }
3273 return os::YIELD_UNKNOWN ;
3274 }
3276 void os::yield() { os::NakedYield(); }
3278 void os::yield_all(int attempts) {
3279 // Yields to all threads, including threads with lower priorities
3280 Sleep(1);
3281 }
3283 // Win32 only gives you access to seven real priorities at a time,
3284 // so we compress Java's ten down to seven. It would be better
3285 // if we dynamically adjusted relative priorities.
3287 int os::java_to_os_priority[CriticalPriority + 1] = {
3288 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3289 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3290 THREAD_PRIORITY_LOWEST, // 2
3291 THREAD_PRIORITY_BELOW_NORMAL, // 3
3292 THREAD_PRIORITY_BELOW_NORMAL, // 4
3293 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3294 THREAD_PRIORITY_NORMAL, // 6
3295 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3296 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3297 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3298 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3299 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3300 };
3302 int prio_policy1[CriticalPriority + 1] = {
3303 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3304 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3305 THREAD_PRIORITY_LOWEST, // 2
3306 THREAD_PRIORITY_BELOW_NORMAL, // 3
3307 THREAD_PRIORITY_BELOW_NORMAL, // 4
3308 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3309 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3310 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3311 THREAD_PRIORITY_HIGHEST, // 8
3312 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3313 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3314 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3315 };
3317 static int prio_init() {
3318 // If ThreadPriorityPolicy is 1, switch tables
3319 if (ThreadPriorityPolicy == 1) {
3320 int i;
3321 for (i = 0; i < CriticalPriority + 1; i++) {
3322 os::java_to_os_priority[i] = prio_policy1[i];
3323 }
3324 }
3325 if (UseCriticalJavaThreadPriority) {
3326 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3327 }
3328 return 0;
3329 }
3331 OSReturn os::set_native_priority(Thread* thread, int priority) {
3332 if (!UseThreadPriorities) return OS_OK;
3333 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3334 return ret ? OS_OK : OS_ERR;
3335 }
3337 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3338 if ( !UseThreadPriorities ) {
3339 *priority_ptr = java_to_os_priority[NormPriority];
3340 return OS_OK;
3341 }
3342 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3343 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3344 assert(false, "GetThreadPriority failed");
3345 return OS_ERR;
3346 }
3347 *priority_ptr = os_prio;
3348 return OS_OK;
3349 }
3352 // Hint to the underlying OS that a task switch would not be good.
3353 // Void return because it's a hint and can fail.
3354 void os::hint_no_preempt() {}
3356 void os::interrupt(Thread* thread) {
3357 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3358 "possibility of dangling Thread pointer");
3360 OSThread* osthread = thread->osthread();
3361 osthread->set_interrupted(true);
3362 // More than one thread can get here with the same value of osthread,
3363 // resulting in multiple notifications. We do, however, want the store
3364 // to interrupted() to be visible to other threads before we post
3365 // the interrupt event.
3366 OrderAccess::release();
3367 SetEvent(osthread->interrupt_event());
3368 // For JSR166: unpark after setting status
3369 if (thread->is_Java_thread())
3370 ((JavaThread*)thread)->parker()->unpark();
3372 ParkEvent * ev = thread->_ParkEvent ;
3373 if (ev != NULL) ev->unpark() ;
3375 }
3378 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3379 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3380 "possibility of dangling Thread pointer");
3382 OSThread* osthread = thread->osthread();
3383 bool interrupted = osthread->interrupted();
3384 // There is no synchronization between the setting of the interrupt
3385 // and it being cleared here. It is critical - see 6535709 - that
3386 // we only clear the interrupt state, and reset the interrupt event,
3387 // if we are going to report that we were indeed interrupted - else
3388 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3389 // depending on the timing
3390 if (interrupted && clear_interrupted) {
3391 osthread->set_interrupted(false);
3392 ResetEvent(osthread->interrupt_event());
3393 } // Otherwise leave the interrupted state alone
3395 return interrupted;
3396 }
3398 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3399 ExtendedPC os::get_thread_pc(Thread* thread) {
3400 CONTEXT context;
3401 context.ContextFlags = CONTEXT_CONTROL;
3402 HANDLE handle = thread->osthread()->thread_handle();
3403 #ifdef _M_IA64
3404 assert(0, "Fix get_thread_pc");
3405 return ExtendedPC(NULL);
3406 #else
3407 if (GetThreadContext(handle, &context)) {
3408 #ifdef _M_AMD64
3409 return ExtendedPC((address) context.Rip);
3410 #else
3411 return ExtendedPC((address) context.Eip);
3412 #endif
3413 } else {
3414 return ExtendedPC(NULL);
3415 }
3416 #endif
3417 }
3419 // GetCurrentThreadId() returns DWORD
3420 intx os::current_thread_id() { return GetCurrentThreadId(); }
3422 static int _initial_pid = 0;
3424 int os::current_process_id()
3425 {
3426 return (_initial_pid ? _initial_pid : _getpid());
3427 }
3429 int os::win32::_vm_page_size = 0;
3430 int os::win32::_vm_allocation_granularity = 0;
3431 int os::win32::_processor_type = 0;
3432 // Processor level is not available on non-NT systems, use vm_version instead
3433 int os::win32::_processor_level = 0;
3434 julong os::win32::_physical_memory = 0;
3435 size_t os::win32::_default_stack_size = 0;
3437 intx os::win32::_os_thread_limit = 0;
3438 volatile intx os::win32::_os_thread_count = 0;
3440 bool os::win32::_is_nt = false;
3441 bool os::win32::_is_windows_2003 = false;
3442 bool os::win32::_is_windows_server = false;
3444 void os::win32::initialize_system_info() {
3445 SYSTEM_INFO si;
3446 GetSystemInfo(&si);
3447 _vm_page_size = si.dwPageSize;
3448 _vm_allocation_granularity = si.dwAllocationGranularity;
3449 _processor_type = si.dwProcessorType;
3450 _processor_level = si.wProcessorLevel;
3451 set_processor_count(si.dwNumberOfProcessors);
3453 MEMORYSTATUSEX ms;
3454 ms.dwLength = sizeof(ms);
3456 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3457 // dwMemoryLoad (% of memory in use)
3458 GlobalMemoryStatusEx(&ms);
3459 _physical_memory = ms.ullTotalPhys;
3461 OSVERSIONINFOEX oi;
3462 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3463 GetVersionEx((OSVERSIONINFO*)&oi);
3464 switch(oi.dwPlatformId) {
3465 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3466 case VER_PLATFORM_WIN32_NT:
3467 _is_nt = true;
3468 {
3469 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3470 if (os_vers == 5002) {
3471 _is_windows_2003 = true;
3472 }
3473 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3474 oi.wProductType == VER_NT_SERVER) {
3475 _is_windows_server = true;
3476 }
3477 }
3478 break;
3479 default: fatal("Unknown platform");
3480 }
3482 _default_stack_size = os::current_stack_size();
3483 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3484 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3485 "stack size not a multiple of page size");
3487 initialize_performance_counter();
3489 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3490 // known to deadlock the system, if the VM issues to thread operations with
3491 // a too high frequency, e.g., such as changing the priorities.
3492 // The 6000 seems to work well - no deadlocks has been notices on the test
3493 // programs that we have seen experience this problem.
3494 if (!os::win32::is_nt()) {
3495 StarvationMonitorInterval = 6000;
3496 }
3497 }
3500 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3501 char path[MAX_PATH];
3502 DWORD size;
3503 DWORD pathLen = (DWORD)sizeof(path);
3504 HINSTANCE result = NULL;
3506 // only allow library name without path component
3507 assert(strchr(name, '\\') == NULL, "path not allowed");
3508 assert(strchr(name, ':') == NULL, "path not allowed");
3509 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3510 jio_snprintf(ebuf, ebuflen,
3511 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3512 return NULL;
3513 }
3515 // search system directory
3516 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3517 strcat(path, "\\");
3518 strcat(path, name);
3519 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3520 return result;
3521 }
3522 }
3524 // try Windows directory
3525 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3526 strcat(path, "\\");
3527 strcat(path, name);
3528 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3529 return result;
3530 }
3531 }
3533 jio_snprintf(ebuf, ebuflen,
3534 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3535 return NULL;
3536 }
3538 void os::win32::setmode_streams() {
3539 _setmode(_fileno(stdin), _O_BINARY);
3540 _setmode(_fileno(stdout), _O_BINARY);
3541 _setmode(_fileno(stderr), _O_BINARY);
3542 }
3545 bool os::is_debugger_attached() {
3546 return IsDebuggerPresent() ? true : false;
3547 }
3550 void os::wait_for_keypress_at_exit(void) {
3551 if (PauseAtExit) {
3552 fprintf(stderr, "Press any key to continue...\n");
3553 fgetc(stdin);
3554 }
3555 }
3558 int os::message_box(const char* title, const char* message) {
3559 int result = MessageBox(NULL, message, title,
3560 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3561 return result == IDYES;
3562 }
3564 int os::allocate_thread_local_storage() {
3565 return TlsAlloc();
3566 }
3569 void os::free_thread_local_storage(int index) {
3570 TlsFree(index);
3571 }
3574 void os::thread_local_storage_at_put(int index, void* value) {
3575 TlsSetValue(index, value);
3576 assert(thread_local_storage_at(index) == value, "Just checking");
3577 }
3580 void* os::thread_local_storage_at(int index) {
3581 return TlsGetValue(index);
3582 }
3585 #ifndef PRODUCT
3586 #ifndef _WIN64
3587 // Helpers to check whether NX protection is enabled
3588 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3589 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3590 pex->ExceptionRecord->NumberParameters > 0 &&
3591 pex->ExceptionRecord->ExceptionInformation[0] ==
3592 EXCEPTION_INFO_EXEC_VIOLATION) {
3593 return EXCEPTION_EXECUTE_HANDLER;
3594 }
3595 return EXCEPTION_CONTINUE_SEARCH;
3596 }
3598 void nx_check_protection() {
3599 // If NX is enabled we'll get an exception calling into code on the stack
3600 char code[] = { (char)0xC3 }; // ret
3601 void *code_ptr = (void *)code;
3602 __try {
3603 __asm call code_ptr
3604 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3605 tty->print_raw_cr("NX protection detected.");
3606 }
3607 }
3608 #endif // _WIN64
3609 #endif // PRODUCT
3611 // this is called _before_ the global arguments have been parsed
3612 void os::init(void) {
3613 _initial_pid = _getpid();
3615 init_random(1234567);
3617 win32::initialize_system_info();
3618 win32::setmode_streams();
3619 init_page_sizes((size_t) win32::vm_page_size());
3621 // For better scalability on MP systems (must be called after initialize_system_info)
3622 #ifndef PRODUCT
3623 if (is_MP()) {
3624 NoYieldsInMicrolock = true;
3625 }
3626 #endif
3627 // This may be overridden later when argument processing is done.
3628 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3629 os::win32::is_windows_2003());
3631 // Initialize main_process and main_thread
3632 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3633 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3634 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3635 fatal("DuplicateHandle failed\n");
3636 }
3637 main_thread_id = (int) GetCurrentThreadId();
3638 }
3640 // To install functions for atexit processing
3641 extern "C" {
3642 static void perfMemory_exit_helper() {
3643 perfMemory_exit();
3644 }
3645 }
3647 // this is called _after_ the global arguments have been parsed
3648 jint os::init_2(void) {
3649 // Allocate a single page and mark it as readable for safepoint polling
3650 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3651 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3653 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3654 guarantee( return_page != NULL, "Commit Failed for polling page");
3656 os::set_polling_page( polling_page );
3658 #ifndef PRODUCT
3659 if( Verbose && PrintMiscellaneous )
3660 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3661 #endif
3663 if (!UseMembar) {
3664 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3665 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3667 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3668 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3670 os::set_memory_serialize_page( mem_serialize_page );
3672 #ifndef PRODUCT
3673 if(Verbose && PrintMiscellaneous)
3674 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3675 #endif
3676 }
3678 os::large_page_init();
3680 // Setup Windows Exceptions
3682 // On Itanium systems, Structured Exception Handling does not
3683 // work since stack frames must be walkable by the OS. Since
3684 // much of our code is dynamically generated, and we do not have
3685 // proper unwind .xdata sections, the system simply exits
3686 // rather than delivering the exception. To work around
3687 // this we use VectorExceptions instead.
3688 #ifdef _WIN64
3689 if (UseVectoredExceptions) {
3690 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelExceptionFilter);
3691 }
3692 #endif
3694 // for debugging float code generation bugs
3695 if (ForceFloatExceptions) {
3696 #ifndef _WIN64
3697 static long fp_control_word = 0;
3698 __asm { fstcw fp_control_word }
3699 // see Intel PPro Manual, Vol. 2, p 7-16
3700 const long precision = 0x20;
3701 const long underflow = 0x10;
3702 const long overflow = 0x08;
3703 const long zero_div = 0x04;
3704 const long denorm = 0x02;
3705 const long invalid = 0x01;
3706 fp_control_word |= invalid;
3707 __asm { fldcw fp_control_word }
3708 #endif
3709 }
3711 // If stack_commit_size is 0, windows will reserve the default size,
3712 // but only commit a small portion of it.
3713 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3714 size_t default_reserve_size = os::win32::default_stack_size();
3715 size_t actual_reserve_size = stack_commit_size;
3716 if (stack_commit_size < default_reserve_size) {
3717 // If stack_commit_size == 0, we want this too
3718 actual_reserve_size = default_reserve_size;
3719 }
3721 // Check minimum allowable stack size for thread creation and to initialize
3722 // the java system classes, including StackOverflowError - depends on page
3723 // size. Add a page for compiler2 recursion in main thread.
3724 // Add in 2*BytesPerWord times page size to account for VM stack during
3725 // class initialization depending on 32 or 64 bit VM.
3726 size_t min_stack_allowed =
3727 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3728 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3729 if (actual_reserve_size < min_stack_allowed) {
3730 tty->print_cr("\nThe stack size specified is too small, "
3731 "Specify at least %dk",
3732 min_stack_allowed / K);
3733 return JNI_ERR;
3734 }
3736 JavaThread::set_stack_size_at_create(stack_commit_size);
3738 // Calculate theoretical max. size of Threads to guard gainst artifical
3739 // out-of-memory situations, where all available address-space has been
3740 // reserved by thread stacks.
3741 assert(actual_reserve_size != 0, "Must have a stack");
3743 // Calculate the thread limit when we should start doing Virtual Memory
3744 // banging. Currently when the threads will have used all but 200Mb of space.
3745 //
3746 // TODO: consider performing a similar calculation for commit size instead
3747 // as reserve size, since on a 64-bit platform we'll run into that more
3748 // often than running out of virtual memory space. We can use the
3749 // lower value of the two calculations as the os_thread_limit.
3750 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3751 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3753 // at exit methods are called in the reverse order of their registration.
3754 // there is no limit to the number of functions registered. atexit does
3755 // not set errno.
3757 if (PerfAllowAtExitRegistration) {
3758 // only register atexit functions if PerfAllowAtExitRegistration is set.
3759 // atexit functions can be delayed until process exit time, which
3760 // can be problematic for embedded VM situations. Embedded VMs should
3761 // call DestroyJavaVM() to assure that VM resources are released.
3763 // note: perfMemory_exit_helper atexit function may be removed in
3764 // the future if the appropriate cleanup code can be added to the
3765 // VM_Exit VMOperation's doit method.
3766 if (atexit(perfMemory_exit_helper) != 0) {
3767 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3768 }
3769 }
3771 #ifndef _WIN64
3772 // Print something if NX is enabled (win32 on AMD64)
3773 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3774 #endif
3776 // initialize thread priority policy
3777 prio_init();
3779 if (UseNUMA && !ForceNUMA) {
3780 UseNUMA = false; // We don't fully support this yet
3781 }
3783 if (UseNUMAInterleaving) {
3784 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3785 bool success = numa_interleaving_init();
3786 if (!success) UseNUMAInterleaving = false;
3787 }
3789 return JNI_OK;
3790 }
3792 void os::init_3(void) {
3793 return;
3794 }
3796 // Mark the polling page as unreadable
3797 void os::make_polling_page_unreadable(void) {
3798 DWORD old_status;
3799 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
3800 fatal("Could not disable polling page");
3801 };
3803 // Mark the polling page as readable
3804 void os::make_polling_page_readable(void) {
3805 DWORD old_status;
3806 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
3807 fatal("Could not enable polling page");
3808 };
3811 int os::stat(const char *path, struct stat *sbuf) {
3812 char pathbuf[MAX_PATH];
3813 if (strlen(path) > MAX_PATH - 1) {
3814 errno = ENAMETOOLONG;
3815 return -1;
3816 }
3817 os::native_path(strcpy(pathbuf, path));
3818 int ret = ::stat(pathbuf, sbuf);
3819 if (sbuf != NULL && UseUTCFileTimestamp) {
3820 // Fix for 6539723. st_mtime returned from stat() is dependent on
3821 // the system timezone and so can return different values for the
3822 // same file if/when daylight savings time changes. This adjustment
3823 // makes sure the same timestamp is returned regardless of the TZ.
3824 //
3825 // See:
3826 // http://msdn.microsoft.com/library/
3827 // default.asp?url=/library/en-us/sysinfo/base/
3828 // time_zone_information_str.asp
3829 // and
3830 // http://msdn.microsoft.com/library/default.asp?url=
3831 // /library/en-us/sysinfo/base/settimezoneinformation.asp
3832 //
3833 // NOTE: there is a insidious bug here: If the timezone is changed
3834 // after the call to stat() but before 'GetTimeZoneInformation()', then
3835 // the adjustment we do here will be wrong and we'll return the wrong
3836 // value (which will likely end up creating an invalid class data
3837 // archive). Absent a better API for this, or some time zone locking
3838 // mechanism, we'll have to live with this risk.
3839 TIME_ZONE_INFORMATION tz;
3840 DWORD tzid = GetTimeZoneInformation(&tz);
3841 int daylightBias =
3842 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
3843 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
3844 }
3845 return ret;
3846 }
3849 #define FT2INT64(ft) \
3850 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
3853 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3854 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3855 // of a thread.
3856 //
3857 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3858 // the fast estimate available on the platform.
3860 // current_thread_cpu_time() is not optimized for Windows yet
3861 jlong os::current_thread_cpu_time() {
3862 // return user + sys since the cost is the same
3863 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
3864 }
3866 jlong os::thread_cpu_time(Thread* thread) {
3867 // consistent with what current_thread_cpu_time() returns.
3868 return os::thread_cpu_time(thread, true /* user+sys */);
3869 }
3871 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3872 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3873 }
3875 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
3876 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
3877 // If this function changes, os::is_thread_cpu_time_supported() should too
3878 if (os::win32::is_nt()) {
3879 FILETIME CreationTime;
3880 FILETIME ExitTime;
3881 FILETIME KernelTime;
3882 FILETIME UserTime;
3884 if ( GetThreadTimes(thread->osthread()->thread_handle(),
3885 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3886 return -1;
3887 else
3888 if (user_sys_cpu_time) {
3889 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
3890 } else {
3891 return FT2INT64(UserTime) * 100;
3892 }
3893 } else {
3894 return (jlong) timeGetTime() * 1000000;
3895 }
3896 }
3898 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3899 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3900 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3901 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3902 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3903 }
3905 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3906 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
3907 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
3908 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
3909 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3910 }
3912 bool os::is_thread_cpu_time_supported() {
3913 // see os::thread_cpu_time
3914 if (os::win32::is_nt()) {
3915 FILETIME CreationTime;
3916 FILETIME ExitTime;
3917 FILETIME KernelTime;
3918 FILETIME UserTime;
3920 if ( GetThreadTimes(GetCurrentThread(),
3921 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
3922 return false;
3923 else
3924 return true;
3925 } else {
3926 return false;
3927 }
3928 }
3930 // Windows does't provide a loadavg primitive so this is stubbed out for now.
3931 // It does have primitives (PDH API) to get CPU usage and run queue length.
3932 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
3933 // If we wanted to implement loadavg on Windows, we have a few options:
3934 //
3935 // a) Query CPU usage and run queue length and "fake" an answer by
3936 // returning the CPU usage if it's under 100%, and the run queue
3937 // length otherwise. It turns out that querying is pretty slow
3938 // on Windows, on the order of 200 microseconds on a fast machine.
3939 // Note that on the Windows the CPU usage value is the % usage
3940 // since the last time the API was called (and the first call
3941 // returns 100%), so we'd have to deal with that as well.
3942 //
3943 // b) Sample the "fake" answer using a sampling thread and store
3944 // the answer in a global variable. The call to loadavg would
3945 // just return the value of the global, avoiding the slow query.
3946 //
3947 // c) Sample a better answer using exponential decay to smooth the
3948 // value. This is basically the algorithm used by UNIX kernels.
3949 //
3950 // Note that sampling thread starvation could affect both (b) and (c).
3951 int os::loadavg(double loadavg[], int nelem) {
3952 return -1;
3953 }
3956 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
3957 bool os::dont_yield() {
3958 return DontYieldALot;
3959 }
3961 // This method is a slightly reworked copy of JDK's sysOpen
3962 // from src/windows/hpi/src/sys_api_md.c
3964 int os::open(const char *path, int oflag, int mode) {
3965 char pathbuf[MAX_PATH];
3967 if (strlen(path) > MAX_PATH - 1) {
3968 errno = ENAMETOOLONG;
3969 return -1;
3970 }
3971 os::native_path(strcpy(pathbuf, path));
3972 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
3973 }
3975 // Is a (classpath) directory empty?
3976 bool os::dir_is_empty(const char* path) {
3977 WIN32_FIND_DATA fd;
3978 HANDLE f = FindFirstFile(path, &fd);
3979 if (f == INVALID_HANDLE_VALUE) {
3980 return true;
3981 }
3982 FindClose(f);
3983 return false;
3984 }
3986 // create binary file, rewriting existing file if required
3987 int os::create_binary_file(const char* path, bool rewrite_existing) {
3988 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
3989 if (!rewrite_existing) {
3990 oflags |= _O_EXCL;
3991 }
3992 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
3993 }
3995 // return current position of file pointer
3996 jlong os::current_file_offset(int fd) {
3997 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
3998 }
4000 // move file pointer to the specified offset
4001 jlong os::seek_to_file_offset(int fd, jlong offset) {
4002 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4003 }
4006 jlong os::lseek(int fd, jlong offset, int whence) {
4007 return (jlong) ::_lseeki64(fd, offset, whence);
4008 }
4010 // This method is a slightly reworked copy of JDK's sysNativePath
4011 // from src/windows/hpi/src/path_md.c
4013 /* Convert a pathname to native format. On win32, this involves forcing all
4014 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4015 sometimes rejects '/') and removing redundant separators. The input path is
4016 assumed to have been converted into the character encoding used by the local
4017 system. Because this might be a double-byte encoding, care is taken to
4018 treat double-byte lead characters correctly.
4020 This procedure modifies the given path in place, as the result is never
4021 longer than the original. There is no error return; this operation always
4022 succeeds. */
4023 char * os::native_path(char *path) {
4024 char *src = path, *dst = path, *end = path;
4025 char *colon = NULL; /* If a drive specifier is found, this will
4026 point to the colon following the drive
4027 letter */
4029 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4030 assert(((!::IsDBCSLeadByte('/'))
4031 && (!::IsDBCSLeadByte('\\'))
4032 && (!::IsDBCSLeadByte(':'))),
4033 "Illegal lead byte");
4035 /* Check for leading separators */
4036 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4037 while (isfilesep(*src)) {
4038 src++;
4039 }
4041 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4042 /* Remove leading separators if followed by drive specifier. This
4043 hack is necessary to support file URLs containing drive
4044 specifiers (e.g., "file://c:/path"). As a side effect,
4045 "/c:/path" can be used as an alternative to "c:/path". */
4046 *dst++ = *src++;
4047 colon = dst;
4048 *dst++ = ':';
4049 src++;
4050 } else {
4051 src = path;
4052 if (isfilesep(src[0]) && isfilesep(src[1])) {
4053 /* UNC pathname: Retain first separator; leave src pointed at
4054 second separator so that further separators will be collapsed
4055 into the second separator. The result will be a pathname
4056 beginning with "\\\\" followed (most likely) by a host name. */
4057 src = dst = path + 1;
4058 path[0] = '\\'; /* Force first separator to '\\' */
4059 }
4060 }
4062 end = dst;
4064 /* Remove redundant separators from remainder of path, forcing all
4065 separators to be '\\' rather than '/'. Also, single byte space
4066 characters are removed from the end of the path because those
4067 are not legal ending characters on this operating system.
4068 */
4069 while (*src != '\0') {
4070 if (isfilesep(*src)) {
4071 *dst++ = '\\'; src++;
4072 while (isfilesep(*src)) src++;
4073 if (*src == '\0') {
4074 /* Check for trailing separator */
4075 end = dst;
4076 if (colon == dst - 2) break; /* "z:\\" */
4077 if (dst == path + 1) break; /* "\\" */
4078 if (dst == path + 2 && isfilesep(path[0])) {
4079 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4080 beginning of a UNC pathname. Even though it is not, by
4081 itself, a valid UNC pathname, we leave it as is in order
4082 to be consistent with the path canonicalizer as well
4083 as the win32 APIs, which treat this case as an invalid
4084 UNC pathname rather than as an alias for the root
4085 directory of the current drive. */
4086 break;
4087 }
4088 end = --dst; /* Path does not denote a root directory, so
4089 remove trailing separator */
4090 break;
4091 }
4092 end = dst;
4093 } else {
4094 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4095 *dst++ = *src++;
4096 if (*src) *dst++ = *src++;
4097 end = dst;
4098 } else { /* Copy a single-byte character */
4099 char c = *src++;
4100 *dst++ = c;
4101 /* Space is not a legal ending character */
4102 if (c != ' ') end = dst;
4103 }
4104 }
4105 }
4107 *end = '\0';
4109 /* For "z:", add "." to work around a bug in the C runtime library */
4110 if (colon == dst - 1) {
4111 path[2] = '.';
4112 path[3] = '\0';
4113 }
4115 #ifdef DEBUG
4116 jio_fprintf(stderr, "sysNativePath: %s\n", path);
4117 #endif DEBUG
4118 return path;
4119 }
4121 // This code is a copy of JDK's sysSetLength
4122 // from src/windows/hpi/src/sys_api_md.c
4124 int os::ftruncate(int fd, jlong length) {
4125 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4126 long high = (long)(length >> 32);
4127 DWORD ret;
4129 if (h == (HANDLE)(-1)) {
4130 return -1;
4131 }
4133 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4134 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4135 return -1;
4136 }
4138 if (::SetEndOfFile(h) == FALSE) {
4139 return -1;
4140 }
4142 return 0;
4143 }
4146 // This code is a copy of JDK's sysSync
4147 // from src/windows/hpi/src/sys_api_md.c
4148 // except for the legacy workaround for a bug in Win 98
4150 int os::fsync(int fd) {
4151 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4153 if ( (!::FlushFileBuffers(handle)) &&
4154 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4155 /* from winerror.h */
4156 return -1;
4157 }
4158 return 0;
4159 }
4161 static int nonSeekAvailable(int, long *);
4162 static int stdinAvailable(int, long *);
4164 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4165 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4167 // This code is a copy of JDK's sysAvailable
4168 // from src/windows/hpi/src/sys_api_md.c
4170 int os::available(int fd, jlong *bytes) {
4171 jlong cur, end;
4172 struct _stati64 stbuf64;
4174 if (::_fstati64(fd, &stbuf64) >= 0) {
4175 int mode = stbuf64.st_mode;
4176 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4177 int ret;
4178 long lpbytes;
4179 if (fd == 0) {
4180 ret = stdinAvailable(fd, &lpbytes);
4181 } else {
4182 ret = nonSeekAvailable(fd, &lpbytes);
4183 }
4184 (*bytes) = (jlong)(lpbytes);
4185 return ret;
4186 }
4187 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4188 return FALSE;
4189 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4190 return FALSE;
4191 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4192 return FALSE;
4193 }
4194 *bytes = end - cur;
4195 return TRUE;
4196 } else {
4197 return FALSE;
4198 }
4199 }
4201 // This code is a copy of JDK's nonSeekAvailable
4202 // from src/windows/hpi/src/sys_api_md.c
4204 static int nonSeekAvailable(int fd, long *pbytes) {
4205 /* This is used for available on non-seekable devices
4206 * (like both named and anonymous pipes, such as pipes
4207 * connected to an exec'd process).
4208 * Standard Input is a special case.
4209 *
4210 */
4211 HANDLE han;
4213 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4214 return FALSE;
4215 }
4217 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4218 /* PeekNamedPipe fails when at EOF. In that case we
4219 * simply make *pbytes = 0 which is consistent with the
4220 * behavior we get on Solaris when an fd is at EOF.
4221 * The only alternative is to raise an Exception,
4222 * which isn't really warranted.
4223 */
4224 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4225 return FALSE;
4226 }
4227 *pbytes = 0;
4228 }
4229 return TRUE;
4230 }
4232 #define MAX_INPUT_EVENTS 2000
4234 // This code is a copy of JDK's stdinAvailable
4235 // from src/windows/hpi/src/sys_api_md.c
4237 static int stdinAvailable(int fd, long *pbytes) {
4238 HANDLE han;
4239 DWORD numEventsRead = 0; /* Number of events read from buffer */
4240 DWORD numEvents = 0; /* Number of events in buffer */
4241 DWORD i = 0; /* Loop index */
4242 DWORD curLength = 0; /* Position marker */
4243 DWORD actualLength = 0; /* Number of bytes readable */
4244 BOOL error = FALSE; /* Error holder */
4245 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4247 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4248 return FALSE;
4249 }
4251 /* Construct an array of input records in the console buffer */
4252 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4253 if (error == 0) {
4254 return nonSeekAvailable(fd, pbytes);
4255 }
4257 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4258 if (numEvents > MAX_INPUT_EVENTS) {
4259 numEvents = MAX_INPUT_EVENTS;
4260 }
4262 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD));
4263 if (lpBuffer == NULL) {
4264 return FALSE;
4265 }
4267 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4268 if (error == 0) {
4269 os::free(lpBuffer);
4270 return FALSE;
4271 }
4273 /* Examine input records for the number of bytes available */
4274 for(i=0; i<numEvents; i++) {
4275 if (lpBuffer[i].EventType == KEY_EVENT) {
4277 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4278 &(lpBuffer[i].Event);
4279 if (keyRecord->bKeyDown == TRUE) {
4280 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4281 curLength++;
4282 if (*keyPressed == '\r') {
4283 actualLength = curLength;
4284 }
4285 }
4286 }
4287 }
4289 if(lpBuffer != NULL) {
4290 os::free(lpBuffer);
4291 }
4293 *pbytes = (long) actualLength;
4294 return TRUE;
4295 }
4297 // Map a block of memory.
4298 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
4299 char *addr, size_t bytes, bool read_only,
4300 bool allow_exec) {
4301 HANDLE hFile;
4302 char* base;
4304 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4305 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4306 if (hFile == NULL) {
4307 if (PrintMiscellaneous && Verbose) {
4308 DWORD err = GetLastError();
4309 tty->print_cr("CreateFile() failed: GetLastError->%ld.");
4310 }
4311 return NULL;
4312 }
4314 if (allow_exec) {
4315 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4316 // unless it comes from a PE image (which the shared archive is not.)
4317 // Even VirtualProtect refuses to give execute access to mapped memory
4318 // that was not previously executable.
4319 //
4320 // Instead, stick the executable region in anonymous memory. Yuck.
4321 // Penalty is that ~4 pages will not be shareable - in the future
4322 // we might consider DLLizing the shared archive with a proper PE
4323 // header so that mapping executable + sharing is possible.
4325 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4326 PAGE_READWRITE);
4327 if (base == NULL) {
4328 if (PrintMiscellaneous && Verbose) {
4329 DWORD err = GetLastError();
4330 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4331 }
4332 CloseHandle(hFile);
4333 return NULL;
4334 }
4336 DWORD bytes_read;
4337 OVERLAPPED overlapped;
4338 overlapped.Offset = (DWORD)file_offset;
4339 overlapped.OffsetHigh = 0;
4340 overlapped.hEvent = NULL;
4341 // ReadFile guarantees that if the return value is true, the requested
4342 // number of bytes were read before returning.
4343 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4344 if (!res) {
4345 if (PrintMiscellaneous && Verbose) {
4346 DWORD err = GetLastError();
4347 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4348 }
4349 release_memory(base, bytes);
4350 CloseHandle(hFile);
4351 return NULL;
4352 }
4353 } else {
4354 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4355 NULL /*file_name*/);
4356 if (hMap == NULL) {
4357 if (PrintMiscellaneous && Verbose) {
4358 DWORD err = GetLastError();
4359 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.");
4360 }
4361 CloseHandle(hFile);
4362 return NULL;
4363 }
4365 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4366 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4367 (DWORD)bytes, addr);
4368 if (base == NULL) {
4369 if (PrintMiscellaneous && Verbose) {
4370 DWORD err = GetLastError();
4371 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4372 }
4373 CloseHandle(hMap);
4374 CloseHandle(hFile);
4375 return NULL;
4376 }
4378 if (CloseHandle(hMap) == 0) {
4379 if (PrintMiscellaneous && Verbose) {
4380 DWORD err = GetLastError();
4381 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4382 }
4383 CloseHandle(hFile);
4384 return base;
4385 }
4386 }
4388 if (allow_exec) {
4389 DWORD old_protect;
4390 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4391 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4393 if (!res) {
4394 if (PrintMiscellaneous && Verbose) {
4395 DWORD err = GetLastError();
4396 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4397 }
4398 // Don't consider this a hard error, on IA32 even if the
4399 // VirtualProtect fails, we should still be able to execute
4400 CloseHandle(hFile);
4401 return base;
4402 }
4403 }
4405 if (CloseHandle(hFile) == 0) {
4406 if (PrintMiscellaneous && Verbose) {
4407 DWORD err = GetLastError();
4408 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4409 }
4410 return base;
4411 }
4413 return base;
4414 }
4417 // Remap a block of memory.
4418 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
4419 char *addr, size_t bytes, bool read_only,
4420 bool allow_exec) {
4421 // This OS does not allow existing memory maps to be remapped so we
4422 // have to unmap the memory before we remap it.
4423 if (!os::unmap_memory(addr, bytes)) {
4424 return NULL;
4425 }
4427 // There is a very small theoretical window between the unmap_memory()
4428 // call above and the map_memory() call below where a thread in native
4429 // code may be able to access an address that is no longer mapped.
4431 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4432 allow_exec);
4433 }
4436 // Unmap a block of memory.
4437 // Returns true=success, otherwise false.
4439 bool os::unmap_memory(char* addr, size_t bytes) {
4440 BOOL result = UnmapViewOfFile(addr);
4441 if (result == 0) {
4442 if (PrintMiscellaneous && Verbose) {
4443 DWORD err = GetLastError();
4444 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4445 }
4446 return false;
4447 }
4448 return true;
4449 }
4451 void os::pause() {
4452 char filename[MAX_PATH];
4453 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4454 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4455 } else {
4456 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4457 }
4459 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4460 if (fd != -1) {
4461 struct stat buf;
4462 ::close(fd);
4463 while (::stat(filename, &buf) == 0) {
4464 Sleep(100);
4465 }
4466 } else {
4467 jio_fprintf(stderr,
4468 "Could not open pause file '%s', continuing immediately.\n", filename);
4469 }
4470 }
4472 // An Event wraps a win32 "CreateEvent" kernel handle.
4473 //
4474 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4475 //
4476 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4477 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4478 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4479 // In addition, an unpark() operation might fetch the handle field, but the
4480 // event could recycle between the fetch and the SetEvent() operation.
4481 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4482 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4483 // on an stale but recycled handle would be harmless, but in practice this might
4484 // confuse other non-Sun code, so it's not a viable approach.
4485 //
4486 // 2: Once a win32 event handle is associated with an Event, it remains associated
4487 // with the Event. The event handle is never closed. This could be construed
4488 // as handle leakage, but only up to the maximum # of threads that have been extant
4489 // at any one time. This shouldn't be an issue, as windows platforms typically
4490 // permit a process to have hundreds of thousands of open handles.
4491 //
4492 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4493 // and release unused handles.
4494 //
4495 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4496 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4497 //
4498 // 5. Use an RCU-like mechanism (Read-Copy Update).
4499 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4500 //
4501 // We use (2).
4502 //
4503 // TODO-FIXME:
4504 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4505 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4506 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4507 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4508 // into a single win32 CreateEvent() handle.
4509 //
4510 // _Event transitions in park()
4511 // -1 => -1 : illegal
4512 // 1 => 0 : pass - return immediately
4513 // 0 => -1 : block
4514 //
4515 // _Event serves as a restricted-range semaphore :
4516 // -1 : thread is blocked
4517 // 0 : neutral - thread is running or ready
4518 // 1 : signaled - thread is running or ready
4519 //
4520 // Another possible encoding of _Event would be
4521 // with explicit "PARKED" and "SIGNALED" bits.
4523 int os::PlatformEvent::park (jlong Millis) {
4524 guarantee (_ParkHandle != NULL , "Invariant") ;
4525 guarantee (Millis > 0 , "Invariant") ;
4526 int v ;
4528 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4529 // the initial park() operation.
4531 for (;;) {
4532 v = _Event ;
4533 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4534 }
4535 guarantee ((v == 0) || (v == 1), "invariant") ;
4536 if (v != 0) return OS_OK ;
4538 // Do this the hard way by blocking ...
4539 // TODO: consider a brief spin here, gated on the success of recent
4540 // spin attempts by this thread.
4541 //
4542 // We decompose long timeouts into series of shorter timed waits.
4543 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4544 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4545 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4546 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4547 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4548 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4549 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4550 // for the already waited time. This policy does not admit any new outcomes.
4551 // In the future, however, we might want to track the accumulated wait time and
4552 // adjust Millis accordingly if we encounter a spurious wakeup.
4554 const int MAXTIMEOUT = 0x10000000 ;
4555 DWORD rv = WAIT_TIMEOUT ;
4556 while (_Event < 0 && Millis > 0) {
4557 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4558 if (Millis > MAXTIMEOUT) {
4559 prd = MAXTIMEOUT ;
4560 }
4561 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4562 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4563 if (rv == WAIT_TIMEOUT) {
4564 Millis -= prd ;
4565 }
4566 }
4567 v = _Event ;
4568 _Event = 0 ;
4569 OrderAccess::fence() ;
4570 // If we encounter a nearly simultanous timeout expiry and unpark()
4571 // we return OS_OK indicating we awoke via unpark().
4572 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4573 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4574 }
4576 void os::PlatformEvent::park () {
4577 guarantee (_ParkHandle != NULL, "Invariant") ;
4578 // Invariant: Only the thread associated with the Event/PlatformEvent
4579 // may call park().
4580 int v ;
4581 for (;;) {
4582 v = _Event ;
4583 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4584 }
4585 guarantee ((v == 0) || (v == 1), "invariant") ;
4586 if (v != 0) return ;
4588 // Do this the hard way by blocking ...
4589 // TODO: consider a brief spin here, gated on the success of recent
4590 // spin attempts by this thread.
4591 while (_Event < 0) {
4592 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4593 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4594 }
4596 // Usually we'll find _Event == 0 at this point, but as
4597 // an optional optimization we clear it, just in case can
4598 // multiple unpark() operations drove _Event up to 1.
4599 _Event = 0 ;
4600 OrderAccess::fence() ;
4601 guarantee (_Event >= 0, "invariant") ;
4602 }
4604 void os::PlatformEvent::unpark() {
4605 guarantee (_ParkHandle != NULL, "Invariant") ;
4606 int v ;
4607 for (;;) {
4608 v = _Event ; // Increment _Event if it's < 1.
4609 if (v > 0) {
4610 // If it's already signaled just return.
4611 // The LD of _Event could have reordered or be satisfied
4612 // by a read-aside from this processor's write buffer.
4613 // To avoid problems execute a barrier and then
4614 // ratify the value. A degenerate CAS() would also work.
4615 // Viz., CAS (v+0, &_Event, v) == v).
4616 OrderAccess::fence() ;
4617 if (_Event == v) return ;
4618 continue ;
4619 }
4620 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
4621 }
4622 if (v < 0) {
4623 ::SetEvent (_ParkHandle) ;
4624 }
4625 }
4628 // JSR166
4629 // -------------------------------------------------------
4631 /*
4632 * The Windows implementation of Park is very straightforward: Basic
4633 * operations on Win32 Events turn out to have the right semantics to
4634 * use them directly. We opportunistically resuse the event inherited
4635 * from Monitor.
4636 */
4639 void Parker::park(bool isAbsolute, jlong time) {
4640 guarantee (_ParkEvent != NULL, "invariant") ;
4641 // First, demultiplex/decode time arguments
4642 if (time < 0) { // don't wait
4643 return;
4644 }
4645 else if (time == 0 && !isAbsolute) {
4646 time = INFINITE;
4647 }
4648 else if (isAbsolute) {
4649 time -= os::javaTimeMillis(); // convert to relative time
4650 if (time <= 0) // already elapsed
4651 return;
4652 }
4653 else { // relative
4654 time /= 1000000; // Must coarsen from nanos to millis
4655 if (time == 0) // Wait for the minimal time unit if zero
4656 time = 1;
4657 }
4659 JavaThread* thread = (JavaThread*)(Thread::current());
4660 assert(thread->is_Java_thread(), "Must be JavaThread");
4661 JavaThread *jt = (JavaThread *)thread;
4663 // Don't wait if interrupted or already triggered
4664 if (Thread::is_interrupted(thread, false) ||
4665 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4666 ResetEvent(_ParkEvent);
4667 return;
4668 }
4669 else {
4670 ThreadBlockInVM tbivm(jt);
4671 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4672 jt->set_suspend_equivalent();
4674 WaitForSingleObject(_ParkEvent, time);
4675 ResetEvent(_ParkEvent);
4677 // If externally suspended while waiting, re-suspend
4678 if (jt->handle_special_suspend_equivalent_condition()) {
4679 jt->java_suspend_self();
4680 }
4681 }
4682 }
4684 void Parker::unpark() {
4685 guarantee (_ParkEvent != NULL, "invariant") ;
4686 SetEvent(_ParkEvent);
4687 }
4689 // Run the specified command in a separate process. Return its exit value,
4690 // or -1 on failure (e.g. can't create a new process).
4691 int os::fork_and_exec(char* cmd) {
4692 STARTUPINFO si;
4693 PROCESS_INFORMATION pi;
4695 memset(&si, 0, sizeof(si));
4696 si.cb = sizeof(si);
4697 memset(&pi, 0, sizeof(pi));
4698 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4699 cmd, // command line
4700 NULL, // process security attribute
4701 NULL, // thread security attribute
4702 TRUE, // inherits system handles
4703 0, // no creation flags
4704 NULL, // use parent's environment block
4705 NULL, // use parent's starting directory
4706 &si, // (in) startup information
4707 &pi); // (out) process information
4709 if (rslt) {
4710 // Wait until child process exits.
4711 WaitForSingleObject(pi.hProcess, INFINITE);
4713 DWORD exit_code;
4714 GetExitCodeProcess(pi.hProcess, &exit_code);
4716 // Close process and thread handles.
4717 CloseHandle(pi.hProcess);
4718 CloseHandle(pi.hThread);
4720 return (int)exit_code;
4721 } else {
4722 return -1;
4723 }
4724 }
4726 //--------------------------------------------------------------------------------------------------
4727 // Non-product code
4729 static int mallocDebugIntervalCounter = 0;
4730 static int mallocDebugCounter = 0;
4731 bool os::check_heap(bool force) {
4732 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4733 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4734 // Note: HeapValidate executes two hardware breakpoints when it finds something
4735 // wrong; at these points, eax contains the address of the offending block (I think).
4736 // To get to the exlicit error message(s) below, just continue twice.
4737 HANDLE heap = GetProcessHeap();
4738 { HeapLock(heap);
4739 PROCESS_HEAP_ENTRY phe;
4740 phe.lpData = NULL;
4741 while (HeapWalk(heap, &phe) != 0) {
4742 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4743 !HeapValidate(heap, 0, phe.lpData)) {
4744 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4745 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4746 fatal("corrupted C heap");
4747 }
4748 }
4749 DWORD err = GetLastError();
4750 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4751 fatal(err_msg("heap walk aborted with error %d", err));
4752 }
4753 HeapUnlock(heap);
4754 }
4755 mallocDebugIntervalCounter = 0;
4756 }
4757 return true;
4758 }
4761 bool os::find(address addr, outputStream* st) {
4762 // Nothing yet
4763 return false;
4764 }
4766 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4767 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4769 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4770 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4771 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4772 address addr = (address) exceptionRecord->ExceptionInformation[1];
4774 if (os::is_memory_serialize_page(thread, addr))
4775 return EXCEPTION_CONTINUE_EXECUTION;
4776 }
4778 return EXCEPTION_CONTINUE_SEARCH;
4779 }
4781 // We don't build a headless jre for Windows
4782 bool os::is_headless_jre() { return false; }
4785 typedef CRITICAL_SECTION mutex_t;
4786 #define mutexInit(m) InitializeCriticalSection(m)
4787 #define mutexDestroy(m) DeleteCriticalSection(m)
4788 #define mutexLock(m) EnterCriticalSection(m)
4789 #define mutexUnlock(m) LeaveCriticalSection(m)
4791 static bool sock_initialized = FALSE;
4792 static mutex_t sockFnTableMutex;
4794 static void initSock() {
4795 WSADATA wsadata;
4797 if (!os::WinSock2Dll::WinSock2Available()) {
4798 jio_fprintf(stderr, "Could not load Winsock 2 (error: %d)\n",
4799 ::GetLastError());
4800 return;
4801 }
4802 if (sock_initialized == TRUE) return;
4804 ::mutexInit(&sockFnTableMutex);
4805 ::mutexLock(&sockFnTableMutex);
4806 if (os::WinSock2Dll::WSAStartup(MAKEWORD(1,1), &wsadata) != 0) {
4807 jio_fprintf(stderr, "Could not initialize Winsock\n");
4808 }
4809 sock_initialized = TRUE;
4810 ::mutexUnlock(&sockFnTableMutex);
4811 }
4813 struct hostent* os::get_host_by_name(char* name) {
4814 if (!sock_initialized) {
4815 initSock();
4816 }
4817 if (!os::WinSock2Dll::WinSock2Available()) {
4818 return NULL;
4819 }
4820 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
4821 }
4823 int os::socket_close(int fd) {
4824 return ::closesocket(fd);
4825 }
4827 int os::socket_available(int fd, jint *pbytes) {
4828 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
4829 return (ret < 0) ? 0 : 1;
4830 }
4832 int os::socket(int domain, int type, int protocol) {
4833 return ::socket(domain, type, protocol);
4834 }
4836 int os::listen(int fd, int count) {
4837 return ::listen(fd, count);
4838 }
4840 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
4841 return ::connect(fd, him, len);
4842 }
4844 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
4845 return ::accept(fd, him, len);
4846 }
4848 int os::sendto(int fd, char* buf, size_t len, uint flags,
4849 struct sockaddr* to, socklen_t tolen) {
4851 return ::sendto(fd, buf, (int)len, flags, to, tolen);
4852 }
4854 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
4855 sockaddr* from, socklen_t* fromlen) {
4857 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
4858 }
4860 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
4861 return ::recv(fd, buf, (int)nBytes, flags);
4862 }
4864 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
4865 return ::send(fd, buf, (int)nBytes, flags);
4866 }
4868 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
4869 return ::send(fd, buf, (int)nBytes, flags);
4870 }
4872 int os::timeout(int fd, long timeout) {
4873 fd_set tbl;
4874 struct timeval t;
4876 t.tv_sec = timeout / 1000;
4877 t.tv_usec = (timeout % 1000) * 1000;
4879 tbl.fd_count = 1;
4880 tbl.fd_array[0] = fd;
4882 return ::select(1, &tbl, 0, 0, &t);
4883 }
4885 int os::get_host_name(char* name, int namelen) {
4886 return ::gethostname(name, namelen);
4887 }
4889 int os::socket_shutdown(int fd, int howto) {
4890 return ::shutdown(fd, howto);
4891 }
4893 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
4894 return ::bind(fd, him, len);
4895 }
4897 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
4898 return ::getsockname(fd, him, len);
4899 }
4901 int os::get_sock_opt(int fd, int level, int optname,
4902 char* optval, socklen_t* optlen) {
4903 return ::getsockopt(fd, level, optname, optval, optlen);
4904 }
4906 int os::set_sock_opt(int fd, int level, int optname,
4907 const char* optval, socklen_t optlen) {
4908 return ::setsockopt(fd, level, optname, optval, optlen);
4909 }
4912 // Kernel32 API
4913 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
4914 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
4915 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
4916 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
4918 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
4919 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
4920 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
4921 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
4922 BOOL os::Kernel32Dll::initialized = FALSE;
4923 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
4924 assert(initialized && _GetLargePageMinimum != NULL,
4925 "GetLargePageMinimumAvailable() not yet called");
4926 return _GetLargePageMinimum();
4927 }
4929 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
4930 if (!initialized) {
4931 initialize();
4932 }
4933 return _GetLargePageMinimum != NULL;
4934 }
4936 BOOL os::Kernel32Dll::NumaCallsAvailable() {
4937 if (!initialized) {
4938 initialize();
4939 }
4940 return _VirtualAllocExNuma != NULL;
4941 }
4943 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
4944 assert(initialized && _VirtualAllocExNuma != NULL,
4945 "NUMACallsAvailable() not yet called");
4947 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
4948 }
4950 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
4951 assert(initialized && _GetNumaHighestNodeNumber != NULL,
4952 "NUMACallsAvailable() not yet called");
4954 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
4955 }
4957 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
4958 assert(initialized && _GetNumaNodeProcessorMask != NULL,
4959 "NUMACallsAvailable() not yet called");
4961 return _GetNumaNodeProcessorMask(node, proc_mask);
4962 }
4965 void os::Kernel32Dll::initializeCommon() {
4966 if (!initialized) {
4967 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
4968 assert(handle != NULL, "Just check");
4969 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
4970 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
4971 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
4972 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
4973 initialized = TRUE;
4974 }
4975 }
4979 #ifndef JDK6_OR_EARLIER
4981 void os::Kernel32Dll::initialize() {
4982 initializeCommon();
4983 }
4986 // Kernel32 API
4987 inline BOOL os::Kernel32Dll::SwitchToThread() {
4988 return ::SwitchToThread();
4989 }
4991 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
4992 return true;
4993 }
4995 // Help tools
4996 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
4997 return true;
4998 }
5000 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5001 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5002 }
5004 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5005 return ::Module32First(hSnapshot, lpme);
5006 }
5008 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5009 return ::Module32Next(hSnapshot, lpme);
5010 }
5013 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5014 return true;
5015 }
5017 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5018 ::GetNativeSystemInfo(lpSystemInfo);
5019 }
5021 // PSAPI API
5022 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5023 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5024 }
5026 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5027 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5028 }
5030 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5031 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5032 }
5034 inline BOOL os::PSApiDll::PSApiAvailable() {
5035 return true;
5036 }
5039 // WinSock2 API
5040 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5041 return ::WSAStartup(wVersionRequested, lpWSAData);
5042 }
5044 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5045 return ::gethostbyname(name);
5046 }
5048 inline BOOL os::WinSock2Dll::WinSock2Available() {
5049 return true;
5050 }
5052 // Advapi API
5053 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5054 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5055 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5056 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5057 BufferLength, PreviousState, ReturnLength);
5058 }
5060 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5061 PHANDLE TokenHandle) {
5062 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5063 }
5065 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5066 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5067 }
5069 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5070 return true;
5071 }
5073 #else
5074 // Kernel32 API
5075 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5076 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5077 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5078 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5079 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5081 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5082 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5083 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5084 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5085 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5088 void os::Kernel32Dll::initialize() {
5089 if (!initialized) {
5090 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5091 assert(handle != NULL, "Just check");
5093 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5094 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5095 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5096 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5097 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5098 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5099 initializeCommon(); // resolve the functions that always need resolving
5101 initialized = TRUE;
5102 }
5103 }
5105 BOOL os::Kernel32Dll::SwitchToThread() {
5106 assert(initialized && _SwitchToThread != NULL,
5107 "SwitchToThreadAvailable() not yet called");
5108 return _SwitchToThread();
5109 }
5112 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5113 if (!initialized) {
5114 initialize();
5115 }
5116 return _SwitchToThread != NULL;
5117 }
5119 // Help tools
5120 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5121 if (!initialized) {
5122 initialize();
5123 }
5124 return _CreateToolhelp32Snapshot != NULL &&
5125 _Module32First != NULL &&
5126 _Module32Next != NULL;
5127 }
5129 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5130 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5131 "HelpToolsAvailable() not yet called");
5133 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5134 }
5136 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5137 assert(initialized && _Module32First != NULL,
5138 "HelpToolsAvailable() not yet called");
5140 return _Module32First(hSnapshot, lpme);
5141 }
5143 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5144 assert(initialized && _Module32Next != NULL,
5145 "HelpToolsAvailable() not yet called");
5147 return _Module32Next(hSnapshot, lpme);
5148 }
5151 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5152 if (!initialized) {
5153 initialize();
5154 }
5155 return _GetNativeSystemInfo != NULL;
5156 }
5158 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5159 assert(initialized && _GetNativeSystemInfo != NULL,
5160 "GetNativeSystemInfoAvailable() not yet called");
5162 _GetNativeSystemInfo(lpSystemInfo);
5163 }
5167 // PSAPI API
5170 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5171 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5172 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5174 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5175 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5176 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5177 BOOL os::PSApiDll::initialized = FALSE;
5179 void os::PSApiDll::initialize() {
5180 if (!initialized) {
5181 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5182 if (handle != NULL) {
5183 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5184 "EnumProcessModules");
5185 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5186 "GetModuleFileNameExA");
5187 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5188 "GetModuleInformation");
5189 }
5190 initialized = TRUE;
5191 }
5192 }
5196 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5197 assert(initialized && _EnumProcessModules != NULL,
5198 "PSApiAvailable() not yet called");
5199 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5200 }
5202 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5203 assert(initialized && _GetModuleFileNameEx != NULL,
5204 "PSApiAvailable() not yet called");
5205 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5206 }
5208 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5209 assert(initialized && _GetModuleInformation != NULL,
5210 "PSApiAvailable() not yet called");
5211 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5212 }
5214 BOOL os::PSApiDll::PSApiAvailable() {
5215 if (!initialized) {
5216 initialize();
5217 }
5218 return _EnumProcessModules != NULL &&
5219 _GetModuleFileNameEx != NULL &&
5220 _GetModuleInformation != NULL;
5221 }
5224 // WinSock2 API
5225 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5226 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5228 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5229 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5230 BOOL os::WinSock2Dll::initialized = FALSE;
5232 void os::WinSock2Dll::initialize() {
5233 if (!initialized) {
5234 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5235 if (handle != NULL) {
5236 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5237 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5238 }
5239 initialized = TRUE;
5240 }
5241 }
5244 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5245 assert(initialized && _WSAStartup != NULL,
5246 "WinSock2Available() not yet called");
5247 return _WSAStartup(wVersionRequested, lpWSAData);
5248 }
5250 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5251 assert(initialized && _gethostbyname != NULL,
5252 "WinSock2Available() not yet called");
5253 return _gethostbyname(name);
5254 }
5256 BOOL os::WinSock2Dll::WinSock2Available() {
5257 if (!initialized) {
5258 initialize();
5259 }
5260 return _WSAStartup != NULL &&
5261 _gethostbyname != NULL;
5262 }
5264 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5265 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5266 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5268 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5269 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5270 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5271 BOOL os::Advapi32Dll::initialized = FALSE;
5273 void os::Advapi32Dll::initialize() {
5274 if (!initialized) {
5275 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5276 if (handle != NULL) {
5277 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5278 "AdjustTokenPrivileges");
5279 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5280 "OpenProcessToken");
5281 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5282 "LookupPrivilegeValueA");
5283 }
5284 initialized = TRUE;
5285 }
5286 }
5288 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5289 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5290 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5291 assert(initialized && _AdjustTokenPrivileges != NULL,
5292 "AdvapiAvailable() not yet called");
5293 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5294 BufferLength, PreviousState, ReturnLength);
5295 }
5297 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5298 PHANDLE TokenHandle) {
5299 assert(initialized && _OpenProcessToken != NULL,
5300 "AdvapiAvailable() not yet called");
5301 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5302 }
5304 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5305 assert(initialized && _LookupPrivilegeValue != NULL,
5306 "AdvapiAvailable() not yet called");
5307 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5308 }
5310 BOOL os::Advapi32Dll::AdvapiAvailable() {
5311 if (!initialized) {
5312 initialize();
5313 }
5314 return _AdjustTokenPrivileges != NULL &&
5315 _OpenProcessToken != NULL &&
5316 _LookupPrivilegeValue != NULL;
5317 }
5319 #endif