Thu, 20 Jun 2013 15:02:05 +0200
8016697: Use stubs to implement safefetch
Summary: Implement Safefetch as stub routines. This reduces compiler and os dependencies.
Reviewed-by: twisti, kvn
1 /*
2 * Copyright (c) 1997, 2013, 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 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 "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/decoder.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/events.hpp"
68 #include "utilities/growableArray.hpp"
69 #include "utilities/vmError.hpp"
71 #ifdef _DEBUG
72 #include <crtdbg.h>
73 #endif
76 #include <windows.h>
77 #include <sys/types.h>
78 #include <sys/stat.h>
79 #include <sys/timeb.h>
80 #include <objidl.h>
81 #include <shlobj.h>
83 #include <malloc.h>
84 #include <signal.h>
85 #include <direct.h>
86 #include <errno.h>
87 #include <fcntl.h>
88 #include <io.h>
89 #include <process.h> // For _beginthreadex(), _endthreadex()
90 #include <imagehlp.h> // For os::dll_address_to_function_name
91 /* for enumerating dll libraries */
92 #include <vdmdbg.h>
94 // for timer info max values which include all bits
95 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97 // For DLL loading/load error detection
98 // Values of PE COFF
99 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
100 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102 static HANDLE main_process;
103 static HANDLE main_thread;
104 static int main_thread_id;
106 static FILETIME process_creation_time;
107 static FILETIME process_exit_time;
108 static FILETIME process_user_time;
109 static FILETIME process_kernel_time;
111 #ifdef _M_IA64
112 #define __CPU__ ia64
113 #elif _M_AMD64
114 #define __CPU__ amd64
115 #else
116 #define __CPU__ i486
117 #endif
119 // save DLL module handle, used by GetModuleFileName
121 HINSTANCE vm_lib_handle;
123 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
124 switch (reason) {
125 case DLL_PROCESS_ATTACH:
126 vm_lib_handle = hinst;
127 if(ForceTimeHighResolution)
128 timeBeginPeriod(1L);
129 break;
130 case DLL_PROCESS_DETACH:
131 if(ForceTimeHighResolution)
132 timeEndPeriod(1L);
133 break;
134 default:
135 break;
136 }
137 return true;
138 }
140 static inline double fileTimeAsDouble(FILETIME* time) {
141 const double high = (double) ((unsigned int) ~0);
142 const double split = 10000000.0;
143 double result = (time->dwLowDateTime / split) +
144 time->dwHighDateTime * (high/split);
145 return result;
146 }
148 // Implementation of os
150 bool os::getenv(const char* name, char* buffer, int len) {
151 int result = GetEnvironmentVariable(name, buffer, len);
152 return result > 0 && result < len;
153 }
156 // No setuid programs under Windows.
157 bool os::have_special_privileges() {
158 return false;
159 }
162 // This method is a periodic task to check for misbehaving JNI applications
163 // under CheckJNI, we can add any periodic checks here.
164 // For Windows at the moment does nothing
165 void os::run_periodic_checks() {
166 return;
167 }
169 #ifndef _WIN64
170 // previous UnhandledExceptionFilter, if there is one
171 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
173 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
174 #endif
175 void os::init_system_properties_values() {
176 /* sysclasspath, java_home, dll_dir */
177 {
178 char *home_path;
179 char *dll_path;
180 char *pslash;
181 char *bin = "\\bin";
182 char home_dir[MAX_PATH];
184 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
185 os::jvm_path(home_dir, sizeof(home_dir));
186 // Found the full path to jvm.dll.
187 // Now cut the path to <java_home>/jre if we can.
188 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
189 pslash = strrchr(home_dir, '\\');
190 if (pslash != NULL) {
191 *pslash = '\0'; /* get rid of \{client|server} */
192 pslash = strrchr(home_dir, '\\');
193 if (pslash != NULL)
194 *pslash = '\0'; /* get rid of \bin */
195 }
196 }
198 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
199 if (home_path == NULL)
200 return;
201 strcpy(home_path, home_dir);
202 Arguments::set_java_home(home_path);
204 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
205 if (dll_path == NULL)
206 return;
207 strcpy(dll_path, home_dir);
208 strcat(dll_path, bin);
209 Arguments::set_dll_dir(dll_path);
211 if (!set_boot_path('\\', ';'))
212 return;
213 }
215 /* library_path */
216 #define EXT_DIR "\\lib\\ext"
217 #define BIN_DIR "\\bin"
218 #define PACKAGE_DIR "\\Sun\\Java"
219 {
220 /* Win32 library search order (See the documentation for LoadLibrary):
221 *
222 * 1. The directory from which application is loaded.
223 * 2. The system wide Java Extensions directory (Java only)
224 * 3. System directory (GetSystemDirectory)
225 * 4. Windows directory (GetWindowsDirectory)
226 * 5. The PATH environment variable
227 * 6. The current directory
228 */
230 char *library_path;
231 char tmp[MAX_PATH];
232 char *path_str = ::getenv("PATH");
234 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
235 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
237 library_path[0] = '\0';
239 GetModuleFileName(NULL, tmp, sizeof(tmp));
240 *(strrchr(tmp, '\\')) = '\0';
241 strcat(library_path, tmp);
243 GetWindowsDirectory(tmp, sizeof(tmp));
244 strcat(library_path, ";");
245 strcat(library_path, tmp);
246 strcat(library_path, PACKAGE_DIR BIN_DIR);
248 GetSystemDirectory(tmp, sizeof(tmp));
249 strcat(library_path, ";");
250 strcat(library_path, tmp);
252 GetWindowsDirectory(tmp, sizeof(tmp));
253 strcat(library_path, ";");
254 strcat(library_path, tmp);
256 if (path_str) {
257 strcat(library_path, ";");
258 strcat(library_path, path_str);
259 }
261 strcat(library_path, ";.");
263 Arguments::set_library_path(library_path);
264 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
265 }
267 /* Default extensions directory */
268 {
269 char path[MAX_PATH];
270 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
271 GetWindowsDirectory(path, MAX_PATH);
272 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
273 path, PACKAGE_DIR, EXT_DIR);
274 Arguments::set_ext_dirs(buf);
275 }
276 #undef EXT_DIR
277 #undef BIN_DIR
278 #undef PACKAGE_DIR
280 /* Default endorsed standards directory. */
281 {
282 #define ENDORSED_DIR "\\lib\\endorsed"
283 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
284 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
285 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
286 Arguments::set_endorsed_dirs(buf);
287 #undef ENDORSED_DIR
288 }
290 #ifndef _WIN64
291 // set our UnhandledExceptionFilter and save any previous one
292 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
293 #endif
295 // Done
296 return;
297 }
299 void os::breakpoint() {
300 DebugBreak();
301 }
303 // Invoked from the BREAKPOINT Macro
304 extern "C" void breakpoint() {
305 os::breakpoint();
306 }
308 /*
309 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
310 * So far, this method is only used by Native Memory Tracking, which is
311 * only supported on Windows XP or later.
312 */
313 address os::get_caller_pc(int n) {
314 #ifdef _NMT_NOINLINE_
315 n ++;
316 #endif
317 address pc;
318 if (os::Kernel32Dll::RtlCaptureStackBackTrace(n + 1, 1, (PVOID*)&pc, NULL) == 1) {
319 return pc;
320 }
321 return NULL;
322 }
325 // os::current_stack_base()
326 //
327 // Returns the base of the stack, which is the stack's
328 // starting address. This function must be called
329 // while running on the stack of the thread being queried.
331 address os::current_stack_base() {
332 MEMORY_BASIC_INFORMATION minfo;
333 address stack_bottom;
334 size_t stack_size;
336 VirtualQuery(&minfo, &minfo, sizeof(minfo));
337 stack_bottom = (address)minfo.AllocationBase;
338 stack_size = minfo.RegionSize;
340 // Add up the sizes of all the regions with the same
341 // AllocationBase.
342 while( 1 )
343 {
344 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
345 if ( stack_bottom == (address)minfo.AllocationBase )
346 stack_size += minfo.RegionSize;
347 else
348 break;
349 }
351 #ifdef _M_IA64
352 // IA64 has memory and register stacks
353 //
354 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
355 // at thread creation (1MB backing store growing upwards, 1MB memory stack
356 // growing downwards, 2MB summed up)
357 //
358 // ...
359 // ------- top of stack (high address) -----
360 // |
361 // | 1MB
362 // | Backing Store (Register Stack)
363 // |
364 // | / \
365 // | |
366 // | |
367 // | |
368 // ------------------------ stack base -----
369 // | 1MB
370 // | Memory Stack
371 // |
372 // | |
373 // | |
374 // | |
375 // | \ /
376 // |
377 // ----- bottom of stack (low address) -----
378 // ...
380 stack_size = stack_size / 2;
381 #endif
382 return stack_bottom + stack_size;
383 }
385 size_t os::current_stack_size() {
386 size_t sz;
387 MEMORY_BASIC_INFORMATION minfo;
388 VirtualQuery(&minfo, &minfo, sizeof(minfo));
389 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
390 return sz;
391 }
393 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
394 const struct tm* time_struct_ptr = localtime(clock);
395 if (time_struct_ptr != NULL) {
396 *res = *time_struct_ptr;
397 return res;
398 }
399 return NULL;
400 }
402 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
404 // Thread start routine for all new Java threads
405 static unsigned __stdcall java_start(Thread* thread) {
406 // Try to randomize the cache line index of hot stack frames.
407 // This helps when threads of the same stack traces evict each other's
408 // cache lines. The threads can be either from the same JVM instance, or
409 // from different JVM instances. The benefit is especially true for
410 // processors with hyperthreading technology.
411 static int counter = 0;
412 int pid = os::current_process_id();
413 _alloca(((pid ^ counter++) & 7) * 128);
415 OSThread* osthr = thread->osthread();
416 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
418 if (UseNUMA) {
419 int lgrp_id = os::numa_get_group_id();
420 if (lgrp_id != -1) {
421 thread->set_lgrp_id(lgrp_id);
422 }
423 }
426 // Install a win32 structured exception handler around every thread created
427 // by VM, so VM can genrate error dump when an exception occurred in non-
428 // Java thread (e.g. VM thread).
429 __try {
430 thread->run();
431 } __except(topLevelExceptionFilter(
432 (_EXCEPTION_POINTERS*)_exception_info())) {
433 // Nothing to do.
434 }
436 // One less thread is executing
437 // When the VMThread gets here, the main thread may have already exited
438 // which frees the CodeHeap containing the Atomic::add code
439 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
440 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
441 }
443 return 0;
444 }
446 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
447 // Allocate the OSThread object
448 OSThread* osthread = new OSThread(NULL, NULL);
449 if (osthread == NULL) return NULL;
451 // Initialize support for Java interrupts
452 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
453 if (interrupt_event == NULL) {
454 delete osthread;
455 return NULL;
456 }
457 osthread->set_interrupt_event(interrupt_event);
459 // Store info on the Win32 thread into the OSThread
460 osthread->set_thread_handle(thread_handle);
461 osthread->set_thread_id(thread_id);
463 if (UseNUMA) {
464 int lgrp_id = os::numa_get_group_id();
465 if (lgrp_id != -1) {
466 thread->set_lgrp_id(lgrp_id);
467 }
468 }
470 // Initial thread state is INITIALIZED, not SUSPENDED
471 osthread->set_state(INITIALIZED);
473 return osthread;
474 }
477 bool os::create_attached_thread(JavaThread* thread) {
478 #ifdef ASSERT
479 thread->verify_not_published();
480 #endif
481 HANDLE thread_h;
482 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
483 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
484 fatal("DuplicateHandle failed\n");
485 }
486 OSThread* osthread = create_os_thread(thread, thread_h,
487 (int)current_thread_id());
488 if (osthread == NULL) {
489 return false;
490 }
492 // Initial thread state is RUNNABLE
493 osthread->set_state(RUNNABLE);
495 thread->set_osthread(osthread);
496 return true;
497 }
499 bool os::create_main_thread(JavaThread* thread) {
500 #ifdef ASSERT
501 thread->verify_not_published();
502 #endif
503 if (_starting_thread == NULL) {
504 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
505 if (_starting_thread == NULL) {
506 return false;
507 }
508 }
510 // The primordial thread is runnable from the start)
511 _starting_thread->set_state(RUNNABLE);
513 thread->set_osthread(_starting_thread);
514 return true;
515 }
517 // Allocate and initialize a new OSThread
518 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
519 unsigned thread_id;
521 // Allocate the OSThread object
522 OSThread* osthread = new OSThread(NULL, NULL);
523 if (osthread == NULL) {
524 return false;
525 }
527 // Initialize support for Java interrupts
528 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
529 if (interrupt_event == NULL) {
530 delete osthread;
531 return NULL;
532 }
533 osthread->set_interrupt_event(interrupt_event);
534 osthread->set_interrupted(false);
536 thread->set_osthread(osthread);
538 if (stack_size == 0) {
539 switch (thr_type) {
540 case os::java_thread:
541 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
542 if (JavaThread::stack_size_at_create() > 0)
543 stack_size = JavaThread::stack_size_at_create();
544 break;
545 case os::compiler_thread:
546 if (CompilerThreadStackSize > 0) {
547 stack_size = (size_t)(CompilerThreadStackSize * K);
548 break;
549 } // else fall through:
550 // use VMThreadStackSize if CompilerThreadStackSize is not defined
551 case os::vm_thread:
552 case os::pgc_thread:
553 case os::cgc_thread:
554 case os::watcher_thread:
555 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
556 break;
557 }
558 }
560 // Create the Win32 thread
561 //
562 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
563 // does not specify stack size. Instead, it specifies the size of
564 // initially committed space. The stack size is determined by
565 // PE header in the executable. If the committed "stack_size" is larger
566 // than default value in the PE header, the stack is rounded up to the
567 // nearest multiple of 1MB. For example if the launcher has default
568 // stack size of 320k, specifying any size less than 320k does not
569 // affect the actual stack size at all, it only affects the initial
570 // commitment. On the other hand, specifying 'stack_size' larger than
571 // default value may cause significant increase in memory usage, because
572 // not only the stack space will be rounded up to MB, but also the
573 // entire space is committed upfront.
574 //
575 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
576 // for CreateThread() that can treat 'stack_size' as stack size. However we
577 // are not supposed to call CreateThread() directly according to MSDN
578 // document because JVM uses C runtime library. The good news is that the
579 // flag appears to work with _beginthredex() as well.
581 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
582 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
583 #endif
585 HANDLE thread_handle =
586 (HANDLE)_beginthreadex(NULL,
587 (unsigned)stack_size,
588 (unsigned (__stdcall *)(void*)) java_start,
589 thread,
590 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
591 &thread_id);
592 if (thread_handle == NULL) {
593 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
594 // without the flag.
595 thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED,
601 &thread_id);
602 }
603 if (thread_handle == NULL) {
604 // Need to clean up stuff we've allocated so far
605 CloseHandle(osthread->interrupt_event());
606 thread->set_osthread(NULL);
607 delete osthread;
608 return NULL;
609 }
611 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
613 // Store info on the Win32 thread into the OSThread
614 osthread->set_thread_handle(thread_handle);
615 osthread->set_thread_id(thread_id);
617 // Initial thread state is INITIALIZED, not SUSPENDED
618 osthread->set_state(INITIALIZED);
620 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
621 return true;
622 }
625 // Free Win32 resources related to the OSThread
626 void os::free_thread(OSThread* osthread) {
627 assert(osthread != NULL, "osthread not set");
628 CloseHandle(osthread->thread_handle());
629 CloseHandle(osthread->interrupt_event());
630 delete osthread;
631 }
634 static int has_performance_count = 0;
635 static jlong first_filetime;
636 static jlong initial_performance_count;
637 static jlong performance_frequency;
640 jlong as_long(LARGE_INTEGER x) {
641 jlong result = 0; // initialization to avoid warning
642 set_high(&result, x.HighPart);
643 set_low(&result, x.LowPart);
644 return result;
645 }
648 jlong os::elapsed_counter() {
649 LARGE_INTEGER count;
650 if (has_performance_count) {
651 QueryPerformanceCounter(&count);
652 return as_long(count) - initial_performance_count;
653 } else {
654 FILETIME wt;
655 GetSystemTimeAsFileTime(&wt);
656 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
657 }
658 }
661 jlong os::elapsed_frequency() {
662 if (has_performance_count) {
663 return performance_frequency;
664 } else {
665 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
666 return 10000000;
667 }
668 }
671 julong os::available_memory() {
672 return win32::available_memory();
673 }
675 julong os::win32::available_memory() {
676 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
677 // value if total memory is larger than 4GB
678 MEMORYSTATUSEX ms;
679 ms.dwLength = sizeof(ms);
680 GlobalMemoryStatusEx(&ms);
682 return (julong)ms.ullAvailPhys;
683 }
685 julong os::physical_memory() {
686 return win32::physical_memory();
687 }
689 bool os::has_allocatable_memory_limit(julong* limit) {
690 MEMORYSTATUSEX ms;
691 ms.dwLength = sizeof(ms);
692 GlobalMemoryStatusEx(&ms);
693 #ifdef _LP64
694 *limit = (julong)ms.ullAvailVirtual;
695 return true;
696 #else
697 // Limit to 1400m because of the 2gb address space wall
698 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
699 return true;
700 #endif
701 }
703 // VC6 lacks DWORD_PTR
704 #if _MSC_VER < 1300
705 typedef UINT_PTR DWORD_PTR;
706 #endif
708 int os::active_processor_count() {
709 DWORD_PTR lpProcessAffinityMask = 0;
710 DWORD_PTR lpSystemAffinityMask = 0;
711 int proc_count = processor_count();
712 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
713 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
714 // Nof active processors is number of bits in process affinity mask
715 int bitcount = 0;
716 while (lpProcessAffinityMask != 0) {
717 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
718 bitcount++;
719 }
720 return bitcount;
721 } else {
722 return proc_count;
723 }
724 }
726 void os::set_native_thread_name(const char *name) {
727 // Not yet implemented.
728 return;
729 }
731 bool os::distribute_processes(uint length, uint* distribution) {
732 // Not yet implemented.
733 return false;
734 }
736 bool os::bind_to_processor(uint processor_id) {
737 // Not yet implemented.
738 return false;
739 }
741 static void initialize_performance_counter() {
742 LARGE_INTEGER count;
743 if (QueryPerformanceFrequency(&count)) {
744 has_performance_count = 1;
745 performance_frequency = as_long(count);
746 QueryPerformanceCounter(&count);
747 initial_performance_count = as_long(count);
748 } else {
749 has_performance_count = 0;
750 FILETIME wt;
751 GetSystemTimeAsFileTime(&wt);
752 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
753 }
754 }
757 double os::elapsedTime() {
758 return (double) elapsed_counter() / (double) elapsed_frequency();
759 }
762 // Windows format:
763 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
764 // Java format:
765 // Java standards require the number of milliseconds since 1/1/1970
767 // Constant offset - calculated using offset()
768 static jlong _offset = 116444736000000000;
769 // Fake time counter for reproducible results when debugging
770 static jlong fake_time = 0;
772 #ifdef ASSERT
773 // Just to be safe, recalculate the offset in debug mode
774 static jlong _calculated_offset = 0;
775 static int _has_calculated_offset = 0;
777 jlong offset() {
778 if (_has_calculated_offset) return _calculated_offset;
779 SYSTEMTIME java_origin;
780 java_origin.wYear = 1970;
781 java_origin.wMonth = 1;
782 java_origin.wDayOfWeek = 0; // ignored
783 java_origin.wDay = 1;
784 java_origin.wHour = 0;
785 java_origin.wMinute = 0;
786 java_origin.wSecond = 0;
787 java_origin.wMilliseconds = 0;
788 FILETIME jot;
789 if (!SystemTimeToFileTime(&java_origin, &jot)) {
790 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
791 }
792 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
793 _has_calculated_offset = 1;
794 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
795 return _calculated_offset;
796 }
797 #else
798 jlong offset() {
799 return _offset;
800 }
801 #endif
803 jlong windows_to_java_time(FILETIME wt) {
804 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
805 return (a - offset()) / 10000;
806 }
808 FILETIME java_to_windows_time(jlong l) {
809 jlong a = (l * 10000) + offset();
810 FILETIME result;
811 result.dwHighDateTime = high(a);
812 result.dwLowDateTime = low(a);
813 return result;
814 }
816 bool os::supports_vtime() { return true; }
817 bool os::enable_vtime() { return false; }
818 bool os::vtime_enabled() { return false; }
820 double os::elapsedVTime() {
821 FILETIME created;
822 FILETIME exited;
823 FILETIME kernel;
824 FILETIME user;
825 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
826 // the resolution of windows_to_java_time() should be sufficient (ms)
827 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
828 } else {
829 return elapsedTime();
830 }
831 }
833 jlong os::javaTimeMillis() {
834 if (UseFakeTimers) {
835 return fake_time++;
836 } else {
837 FILETIME wt;
838 GetSystemTimeAsFileTime(&wt);
839 return windows_to_java_time(wt);
840 }
841 }
843 jlong os::javaTimeNanos() {
844 if (!has_performance_count) {
845 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
846 } else {
847 LARGE_INTEGER current_count;
848 QueryPerformanceCounter(¤t_count);
849 double current = as_long(current_count);
850 double freq = performance_frequency;
851 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
852 return time;
853 }
854 }
856 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
857 if (!has_performance_count) {
858 // javaTimeMillis() doesn't have much percision,
859 // but it is not going to wrap -- so all 64 bits
860 info_ptr->max_value = ALL_64_BITS;
862 // this is a wall clock timer, so may skip
863 info_ptr->may_skip_backward = true;
864 info_ptr->may_skip_forward = true;
865 } else {
866 jlong freq = performance_frequency;
867 if (freq < NANOSECS_PER_SEC) {
868 // the performance counter is 64 bits and we will
869 // be multiplying it -- so no wrap in 64 bits
870 info_ptr->max_value = ALL_64_BITS;
871 } else if (freq > NANOSECS_PER_SEC) {
872 // use the max value the counter can reach to
873 // determine the max value which could be returned
874 julong max_counter = (julong)ALL_64_BITS;
875 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
876 } else {
877 // the performance counter is 64 bits and we will
878 // be using it directly -- so no wrap in 64 bits
879 info_ptr->max_value = ALL_64_BITS;
880 }
882 // using a counter, so no skipping
883 info_ptr->may_skip_backward = false;
884 info_ptr->may_skip_forward = false;
885 }
886 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
887 }
889 char* os::local_time_string(char *buf, size_t buflen) {
890 SYSTEMTIME st;
891 GetLocalTime(&st);
892 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
893 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
894 return buf;
895 }
897 bool os::getTimesSecs(double* process_real_time,
898 double* process_user_time,
899 double* process_system_time) {
900 HANDLE h_process = GetCurrentProcess();
901 FILETIME create_time, exit_time, kernel_time, user_time;
902 BOOL result = GetProcessTimes(h_process,
903 &create_time,
904 &exit_time,
905 &kernel_time,
906 &user_time);
907 if (result != 0) {
908 FILETIME wt;
909 GetSystemTimeAsFileTime(&wt);
910 jlong rtc_millis = windows_to_java_time(wt);
911 jlong user_millis = windows_to_java_time(user_time);
912 jlong system_millis = windows_to_java_time(kernel_time);
913 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
914 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
915 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
916 return true;
917 } else {
918 return false;
919 }
920 }
922 void os::shutdown() {
924 // allow PerfMemory to attempt cleanup of any persistent resources
925 perfMemory_exit();
927 // flush buffered output, finish log files
928 ostream_abort();
930 // Check for abort hook
931 abort_hook_t abort_hook = Arguments::abort_hook();
932 if (abort_hook != NULL) {
933 abort_hook();
934 }
935 }
938 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
939 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
941 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
942 HINSTANCE dbghelp;
943 EXCEPTION_POINTERS ep;
944 MINIDUMP_EXCEPTION_INFORMATION mei;
945 MINIDUMP_EXCEPTION_INFORMATION* pmei;
947 HANDLE hProcess = GetCurrentProcess();
948 DWORD processId = GetCurrentProcessId();
949 HANDLE dumpFile;
950 MINIDUMP_TYPE dumpType;
951 static const char* cwd;
953 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
954 #ifndef ASSERT
955 // If running on a client version of Windows and user has not explicitly enabled dumping
956 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
957 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
958 return;
959 // If running on a server version of Windows and user has explictly disabled dumping
960 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
961 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
962 return;
963 }
964 #else
965 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
966 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
967 return;
968 }
969 #endif
971 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
973 if (dbghelp == NULL) {
974 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
975 return;
976 }
978 _MiniDumpWriteDump = CAST_TO_FN_PTR(
979 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
980 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
981 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
983 if (_MiniDumpWriteDump == NULL) {
984 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
985 return;
986 }
988 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
990 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
991 // API_VERSION_NUMBER 11 or higher contains the ones we want though
992 #if API_VERSION_NUMBER >= 11
993 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
994 MiniDumpWithUnloadedModules);
995 #endif
997 cwd = get_current_directory(NULL, 0);
998 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
999 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1001 if (dumpFile == INVALID_HANDLE_VALUE) {
1002 VMError::report_coredump_status("Failed to create file for dumping", false);
1003 return;
1004 }
1005 if (exceptionRecord != NULL && contextRecord != NULL) {
1006 ep.ContextRecord = (PCONTEXT) contextRecord;
1007 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1009 mei.ThreadId = GetCurrentThreadId();
1010 mei.ExceptionPointers = &ep;
1011 pmei = &mei;
1012 } else {
1013 pmei = NULL;
1014 }
1017 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1018 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1019 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1020 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1021 DWORD error = GetLastError();
1022 LPTSTR msgbuf = NULL;
1024 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1025 FORMAT_MESSAGE_FROM_SYSTEM |
1026 FORMAT_MESSAGE_IGNORE_INSERTS,
1027 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1029 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1030 LocalFree(msgbuf);
1031 } else {
1032 // Call to FormatMessage failed, just include the result from GetLastError
1033 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1034 }
1035 VMError::report_coredump_status(buffer, false);
1036 } else {
1037 VMError::report_coredump_status(buffer, true);
1038 }
1040 CloseHandle(dumpFile);
1041 }
1045 void os::abort(bool dump_core)
1046 {
1047 os::shutdown();
1048 // no core dump on Windows
1049 ::exit(1);
1050 }
1052 // Die immediately, no exit hook, no abort hook, no cleanup.
1053 void os::die() {
1054 _exit(-1);
1055 }
1057 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1058 // * dirent_md.c 1.15 00/02/02
1059 //
1060 // The declarations for DIR and struct dirent are in jvm_win32.h.
1062 /* Caller must have already run dirname through JVM_NativePath, which removes
1063 duplicate slashes and converts all instances of '/' into '\\'. */
1065 DIR *
1066 os::opendir(const char *dirname)
1067 {
1068 assert(dirname != NULL, "just checking"); // hotspot change
1069 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1070 DWORD fattr; // hotspot change
1071 char alt_dirname[4] = { 0, 0, 0, 0 };
1073 if (dirp == 0) {
1074 errno = ENOMEM;
1075 return 0;
1076 }
1078 /*
1079 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1080 * as a directory in FindFirstFile(). We detect this case here and
1081 * prepend the current drive name.
1082 */
1083 if (dirname[1] == '\0' && dirname[0] == '\\') {
1084 alt_dirname[0] = _getdrive() + 'A' - 1;
1085 alt_dirname[1] = ':';
1086 alt_dirname[2] = '\\';
1087 alt_dirname[3] = '\0';
1088 dirname = alt_dirname;
1089 }
1091 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1092 if (dirp->path == 0) {
1093 free(dirp, mtInternal);
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097 strcpy(dirp->path, dirname);
1099 fattr = GetFileAttributes(dirp->path);
1100 if (fattr == 0xffffffff) {
1101 free(dirp->path, mtInternal);
1102 free(dirp, mtInternal);
1103 errno = ENOENT;
1104 return 0;
1105 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1106 free(dirp->path, mtInternal);
1107 free(dirp, mtInternal);
1108 errno = ENOTDIR;
1109 return 0;
1110 }
1112 /* Append "*.*", or possibly "\\*.*", to path */
1113 if (dirp->path[1] == ':'
1114 && (dirp->path[2] == '\0'
1115 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1116 /* No '\\' needed for cases like "Z:" or "Z:\" */
1117 strcat(dirp->path, "*.*");
1118 } else {
1119 strcat(dirp->path, "\\*.*");
1120 }
1122 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1123 if (dirp->handle == INVALID_HANDLE_VALUE) {
1124 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1125 free(dirp->path, mtInternal);
1126 free(dirp, mtInternal);
1127 errno = EACCES;
1128 return 0;
1129 }
1130 }
1131 return dirp;
1132 }
1134 /* parameter dbuf unused on Windows */
1136 struct dirent *
1137 os::readdir(DIR *dirp, dirent *dbuf)
1138 {
1139 assert(dirp != NULL, "just checking"); // hotspot change
1140 if (dirp->handle == INVALID_HANDLE_VALUE) {
1141 return 0;
1142 }
1144 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1146 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1147 if (GetLastError() == ERROR_INVALID_HANDLE) {
1148 errno = EBADF;
1149 return 0;
1150 }
1151 FindClose(dirp->handle);
1152 dirp->handle = INVALID_HANDLE_VALUE;
1153 }
1155 return &dirp->dirent;
1156 }
1158 int
1159 os::closedir(DIR *dirp)
1160 {
1161 assert(dirp != NULL, "just checking"); // hotspot change
1162 if (dirp->handle != INVALID_HANDLE_VALUE) {
1163 if (!FindClose(dirp->handle)) {
1164 errno = EBADF;
1165 return -1;
1166 }
1167 dirp->handle = INVALID_HANDLE_VALUE;
1168 }
1169 free(dirp->path, mtInternal);
1170 free(dirp, mtInternal);
1171 return 0;
1172 }
1174 // This must be hard coded because it's the system's temporary
1175 // directory not the java application's temp directory, ala java.io.tmpdir.
1176 const char* os::get_temp_directory() {
1177 static char path_buf[MAX_PATH];
1178 if (GetTempPath(MAX_PATH, path_buf)>0)
1179 return path_buf;
1180 else{
1181 path_buf[0]='\0';
1182 return path_buf;
1183 }
1184 }
1186 static bool file_exists(const char* filename) {
1187 if (filename == NULL || strlen(filename) == 0) {
1188 return false;
1189 }
1190 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1191 }
1193 bool os::dll_build_name(char *buffer, size_t buflen,
1194 const char* pname, const char* fname) {
1195 bool retval = false;
1196 const size_t pnamelen = pname ? strlen(pname) : 0;
1197 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1199 // Return error on buffer overflow.
1200 if (pnamelen + strlen(fname) + 10 > buflen) {
1201 return retval;
1202 }
1204 if (pnamelen == 0) {
1205 jio_snprintf(buffer, buflen, "%s.dll", fname);
1206 retval = true;
1207 } else if (c == ':' || c == '\\') {
1208 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1209 retval = true;
1210 } else if (strchr(pname, *os::path_separator()) != NULL) {
1211 int n;
1212 char** pelements = split_path(pname, &n);
1213 if (pelements == NULL) {
1214 return false;
1215 }
1216 for (int i = 0 ; i < n ; i++) {
1217 char* path = pelements[i];
1218 // Really shouldn't be NULL, but check can't hurt
1219 size_t plen = (path == NULL) ? 0 : strlen(path);
1220 if (plen == 0) {
1221 continue; // skip the empty path values
1222 }
1223 const char lastchar = path[plen - 1];
1224 if (lastchar == ':' || lastchar == '\\') {
1225 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1226 } else {
1227 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1228 }
1229 if (file_exists(buffer)) {
1230 retval = true;
1231 break;
1232 }
1233 }
1234 // release the storage
1235 for (int i = 0 ; i < n ; i++) {
1236 if (pelements[i] != NULL) {
1237 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1238 }
1239 }
1240 if (pelements != NULL) {
1241 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1242 }
1243 } else {
1244 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1245 retval = true;
1246 }
1247 return retval;
1248 }
1250 // Needs to be in os specific directory because windows requires another
1251 // header file <direct.h>
1252 const char* os::get_current_directory(char *buf, size_t buflen) {
1253 int n = static_cast<int>(buflen);
1254 if (buflen > INT_MAX) n = INT_MAX;
1255 return _getcwd(buf, n);
1256 }
1258 //-----------------------------------------------------------
1259 // Helper functions for fatal error handler
1260 #ifdef _WIN64
1261 // Helper routine which returns true if address in
1262 // within the NTDLL address space.
1263 //
1264 static bool _addr_in_ntdll( address addr )
1265 {
1266 HMODULE hmod;
1267 MODULEINFO minfo;
1269 hmod = GetModuleHandle("NTDLL.DLL");
1270 if ( hmod == NULL ) return false;
1271 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1272 &minfo, sizeof(MODULEINFO)) )
1273 return false;
1275 if ( (addr >= minfo.lpBaseOfDll) &&
1276 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1277 return true;
1278 else
1279 return false;
1280 }
1281 #endif
1284 // Enumerate all modules for a given process ID
1285 //
1286 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1287 // different API for doing this. We use PSAPI.DLL on NT based
1288 // Windows and ToolHelp on 95/98/Me.
1290 // Callback function that is called by enumerate_modules() on
1291 // every DLL module.
1292 // Input parameters:
1293 // int pid,
1294 // char* module_file_name,
1295 // address module_base_addr,
1296 // unsigned module_size,
1297 // void* param
1298 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1300 // enumerate_modules for Windows NT, using PSAPI
1301 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1302 {
1303 HANDLE hProcess ;
1305 # define MAX_NUM_MODULES 128
1306 HMODULE modules[MAX_NUM_MODULES];
1307 static char filename[ MAX_PATH ];
1308 int result = 0;
1310 if (!os::PSApiDll::PSApiAvailable()) {
1311 return 0;
1312 }
1314 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1315 FALSE, pid ) ;
1316 if (hProcess == NULL) return 0;
1318 DWORD size_needed;
1319 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1320 sizeof(modules), &size_needed)) {
1321 CloseHandle( hProcess );
1322 return 0;
1323 }
1325 // number of modules that are currently loaded
1326 int num_modules = size_needed / sizeof(HMODULE);
1328 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1329 // Get Full pathname:
1330 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1331 filename, sizeof(filename))) {
1332 filename[0] = '\0';
1333 }
1335 MODULEINFO modinfo;
1336 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1337 &modinfo, sizeof(modinfo))) {
1338 modinfo.lpBaseOfDll = NULL;
1339 modinfo.SizeOfImage = 0;
1340 }
1342 // Invoke callback function
1343 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1344 modinfo.SizeOfImage, param);
1345 if (result) break;
1346 }
1348 CloseHandle( hProcess ) ;
1349 return result;
1350 }
1353 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1354 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1355 {
1356 HANDLE hSnapShot ;
1357 static MODULEENTRY32 modentry ;
1358 int result = 0;
1360 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1361 return 0;
1362 }
1364 // Get a handle to a Toolhelp snapshot of the system
1365 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1366 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1367 return FALSE ;
1368 }
1370 // iterate through all modules
1371 modentry.dwSize = sizeof(MODULEENTRY32) ;
1372 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1374 while( not_done ) {
1375 // invoke the callback
1376 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1377 modentry.modBaseSize, param);
1378 if (result) break;
1380 modentry.dwSize = sizeof(MODULEENTRY32) ;
1381 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1382 }
1384 CloseHandle(hSnapShot);
1385 return result;
1386 }
1388 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1389 {
1390 // Get current process ID if caller doesn't provide it.
1391 if (!pid) pid = os::current_process_id();
1393 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1394 else return _enumerate_modules_windows(pid, func, param);
1395 }
1397 struct _modinfo {
1398 address addr;
1399 char* full_path; // point to a char buffer
1400 int buflen; // size of the buffer
1401 address base_addr;
1402 };
1404 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1405 unsigned size, void * param) {
1406 struct _modinfo *pmod = (struct _modinfo *)param;
1407 if (!pmod) return -1;
1409 if (base_addr <= pmod->addr &&
1410 base_addr+size > pmod->addr) {
1411 // if a buffer is provided, copy path name to the buffer
1412 if (pmod->full_path) {
1413 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1414 }
1415 pmod->base_addr = base_addr;
1416 return 1;
1417 }
1418 return 0;
1419 }
1421 bool os::dll_address_to_library_name(address addr, char* buf,
1422 int buflen, int* offset) {
1423 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1424 // return the full path to the DLL file, sometimes it returns path
1425 // to the corresponding PDB file (debug info); sometimes it only
1426 // returns partial path, which makes life painful.
1428 struct _modinfo mi;
1429 mi.addr = addr;
1430 mi.full_path = buf;
1431 mi.buflen = buflen;
1432 int pid = os::current_process_id();
1433 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1434 // buf already contains path name
1435 if (offset) *offset = addr - mi.base_addr;
1436 return true;
1437 } else {
1438 if (buf) buf[0] = '\0';
1439 if (offset) *offset = -1;
1440 return false;
1441 }
1442 }
1444 bool os::dll_address_to_function_name(address addr, char *buf,
1445 int buflen, int *offset) {
1446 if (Decoder::decode(addr, buf, buflen, offset)) {
1447 return true;
1448 }
1449 if (offset != NULL) *offset = -1;
1450 if (buf != NULL) buf[0] = '\0';
1451 return false;
1452 }
1454 // save the start and end address of jvm.dll into param[0] and param[1]
1455 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1456 unsigned size, void * param) {
1457 if (!param) return -1;
1459 if (base_addr <= (address)_locate_jvm_dll &&
1460 base_addr+size > (address)_locate_jvm_dll) {
1461 ((address*)param)[0] = base_addr;
1462 ((address*)param)[1] = base_addr + size;
1463 return 1;
1464 }
1465 return 0;
1466 }
1468 address vm_lib_location[2]; // start and end address of jvm.dll
1470 // check if addr is inside jvm.dll
1471 bool os::address_is_in_vm(address addr) {
1472 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1473 int pid = os::current_process_id();
1474 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1475 assert(false, "Can't find jvm module.");
1476 return false;
1477 }
1478 }
1480 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1481 }
1483 // print module info; param is outputStream*
1484 static int _print_module(int pid, char* fname, address base,
1485 unsigned size, void* param) {
1486 if (!param) return -1;
1488 outputStream* st = (outputStream*)param;
1490 address end_addr = base + size;
1491 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1492 return 0;
1493 }
1495 // Loads .dll/.so and
1496 // in case of error it checks if .dll/.so was built for the
1497 // same architecture as Hotspot is running on
1498 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1499 {
1500 void * result = LoadLibrary(name);
1501 if (result != NULL)
1502 {
1503 return result;
1504 }
1506 DWORD errcode = GetLastError();
1507 if (errcode == ERROR_MOD_NOT_FOUND) {
1508 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1509 ebuf[ebuflen-1]='\0';
1510 return NULL;
1511 }
1513 // Parsing dll below
1514 // If we can read dll-info and find that dll was built
1515 // for an architecture other than Hotspot is running in
1516 // - then print to buffer "DLL was built for a different architecture"
1517 // else call os::lasterror to obtain system error message
1519 // Read system error message into ebuf
1520 // It may or may not be overwritten below (in the for loop and just above)
1521 lasterror(ebuf, (size_t) ebuflen);
1522 ebuf[ebuflen-1]='\0';
1523 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1524 if (file_descriptor<0)
1525 {
1526 return NULL;
1527 }
1529 uint32_t signature_offset;
1530 uint16_t lib_arch=0;
1531 bool failed_to_get_lib_arch=
1532 (
1533 //Go to position 3c in the dll
1534 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1535 ||
1536 // Read loacation of signature
1537 (sizeof(signature_offset)!=
1538 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1539 ||
1540 //Go to COFF File Header in dll
1541 //that is located after"signature" (4 bytes long)
1542 (os::seek_to_file_offset(file_descriptor,
1543 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1544 ||
1545 //Read field that contains code of architecture
1546 // that dll was build for
1547 (sizeof(lib_arch)!=
1548 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1549 );
1551 ::close(file_descriptor);
1552 if (failed_to_get_lib_arch)
1553 {
1554 // file i/o error - report os::lasterror(...) msg
1555 return NULL;
1556 }
1558 typedef struct
1559 {
1560 uint16_t arch_code;
1561 char* arch_name;
1562 } arch_t;
1564 static const arch_t arch_array[]={
1565 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1566 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1567 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1568 };
1569 #if (defined _M_IA64)
1570 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1571 #elif (defined _M_AMD64)
1572 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1573 #elif (defined _M_IX86)
1574 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1575 #else
1576 #error Method os::dll_load requires that one of following \
1577 is defined :_M_IA64,_M_AMD64 or _M_IX86
1578 #endif
1581 // Obtain a string for printf operation
1582 // lib_arch_str shall contain string what platform this .dll was built for
1583 // running_arch_str shall string contain what platform Hotspot was built for
1584 char *running_arch_str=NULL,*lib_arch_str=NULL;
1585 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1586 {
1587 if (lib_arch==arch_array[i].arch_code)
1588 lib_arch_str=arch_array[i].arch_name;
1589 if (running_arch==arch_array[i].arch_code)
1590 running_arch_str=arch_array[i].arch_name;
1591 }
1593 assert(running_arch_str,
1594 "Didn't find runing architecture code in arch_array");
1596 // If the architure is right
1597 // but some other error took place - report os::lasterror(...) msg
1598 if (lib_arch == running_arch)
1599 {
1600 return NULL;
1601 }
1603 if (lib_arch_str!=NULL)
1604 {
1605 ::_snprintf(ebuf, ebuflen-1,
1606 "Can't load %s-bit .dll on a %s-bit platform",
1607 lib_arch_str,running_arch_str);
1608 }
1609 else
1610 {
1611 // don't know what architecture this dll was build for
1612 ::_snprintf(ebuf, ebuflen-1,
1613 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1614 lib_arch,running_arch_str);
1615 }
1617 return NULL;
1618 }
1621 void os::print_dll_info(outputStream *st) {
1622 int pid = os::current_process_id();
1623 st->print_cr("Dynamic libraries:");
1624 enumerate_modules(pid, _print_module, (void *)st);
1625 }
1627 void os::print_os_info_brief(outputStream* st) {
1628 os::print_os_info(st);
1629 }
1631 void os::print_os_info(outputStream* st) {
1632 st->print("OS:");
1634 os::win32::print_windows_version(st);
1635 }
1637 void os::win32::print_windows_version(outputStream* st) {
1638 OSVERSIONINFOEX osvi;
1639 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1640 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1642 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1643 st->print_cr("N/A");
1644 return;
1645 }
1647 int os_vers = osvi.dwMajorVersion * 1000 + osvi.dwMinorVersion;
1648 if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
1649 switch (os_vers) {
1650 case 3051: st->print(" Windows NT 3.51"); break;
1651 case 4000: st->print(" Windows NT 4.0"); break;
1652 case 5000: st->print(" Windows 2000"); break;
1653 case 5001: st->print(" Windows XP"); break;
1654 case 5002:
1655 case 6000:
1656 case 6001:
1657 case 6002: {
1658 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1659 // find out whether we are running on 64 bit processor or not.
1660 SYSTEM_INFO si;
1661 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1662 if (!os::Kernel32Dll::GetNativeSystemInfoAvailable()){
1663 GetSystemInfo(&si);
1664 } else {
1665 os::Kernel32Dll::GetNativeSystemInfo(&si);
1666 }
1667 if (os_vers == 5002) {
1668 if (osvi.wProductType == VER_NT_WORKSTATION &&
1669 si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1670 st->print(" Windows XP x64 Edition");
1671 else
1672 st->print(" Windows Server 2003 family");
1673 } else if (os_vers == 6000) {
1674 if (osvi.wProductType == VER_NT_WORKSTATION)
1675 st->print(" Windows Vista");
1676 else
1677 st->print(" Windows Server 2008");
1678 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1679 st->print(" , 64 bit");
1680 } else if (os_vers == 6001) {
1681 if (osvi.wProductType == VER_NT_WORKSTATION) {
1682 st->print(" Windows 7");
1683 } else {
1684 // Unrecognized windows, print out its major and minor versions
1685 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1686 }
1687 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1688 st->print(" , 64 bit");
1689 } else if (os_vers == 6002) {
1690 if (osvi.wProductType == VER_NT_WORKSTATION) {
1691 st->print(" Windows 8");
1692 } else {
1693 st->print(" Windows Server 2012");
1694 }
1695 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1696 st->print(" , 64 bit");
1697 } else { // future os
1698 // Unrecognized windows, print out its major and minor versions
1699 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1700 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
1701 st->print(" , 64 bit");
1702 }
1703 break;
1704 }
1705 default: // future windows, print out its major and minor versions
1706 st->print(" Windows NT %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1707 }
1708 } else {
1709 switch (os_vers) {
1710 case 4000: st->print(" Windows 95"); break;
1711 case 4010: st->print(" Windows 98"); break;
1712 case 4090: st->print(" Windows Me"); break;
1713 default: // future windows, print out its major and minor versions
1714 st->print(" Windows %d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
1715 }
1716 }
1717 st->print(" Build %d", osvi.dwBuildNumber);
1718 st->print(" %s", osvi.szCSDVersion); // service pack
1719 st->cr();
1720 }
1722 void os::pd_print_cpu_info(outputStream* st) {
1723 // Nothing to do for now.
1724 }
1726 void os::print_memory_info(outputStream* st) {
1727 st->print("Memory:");
1728 st->print(" %dk page", os::vm_page_size()>>10);
1730 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1731 // value if total memory is larger than 4GB
1732 MEMORYSTATUSEX ms;
1733 ms.dwLength = sizeof(ms);
1734 GlobalMemoryStatusEx(&ms);
1736 st->print(", physical %uk", os::physical_memory() >> 10);
1737 st->print("(%uk free)", os::available_memory() >> 10);
1739 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1740 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1741 st->cr();
1742 }
1744 void os::print_siginfo(outputStream *st, void *siginfo) {
1745 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1746 st->print("siginfo:");
1747 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1749 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1750 er->NumberParameters >= 2) {
1751 switch (er->ExceptionInformation[0]) {
1752 case 0: st->print(", reading address"); break;
1753 case 1: st->print(", writing address"); break;
1754 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1755 er->ExceptionInformation[0]);
1756 }
1757 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1758 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1759 er->NumberParameters >= 2 && UseSharedSpaces) {
1760 FileMapInfo* mapinfo = FileMapInfo::current_info();
1761 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1762 st->print("\n\nError accessing class data sharing archive." \
1763 " Mapped file inaccessible during execution, " \
1764 " possible disk/network problem.");
1765 }
1766 } else {
1767 int num = er->NumberParameters;
1768 if (num > 0) {
1769 st->print(", ExceptionInformation=");
1770 for (int i = 0; i < num; i++) {
1771 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1772 }
1773 }
1774 }
1775 st->cr();
1776 }
1778 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1779 // do nothing
1780 }
1782 static char saved_jvm_path[MAX_PATH] = {0};
1784 // Find the full path to the current module, jvm.dll
1785 void os::jvm_path(char *buf, jint buflen) {
1786 // Error checking.
1787 if (buflen < MAX_PATH) {
1788 assert(false, "must use a large-enough buffer");
1789 buf[0] = '\0';
1790 return;
1791 }
1792 // Lazy resolve the path to current module.
1793 if (saved_jvm_path[0] != 0) {
1794 strcpy(buf, saved_jvm_path);
1795 return;
1796 }
1798 buf[0] = '\0';
1799 if (Arguments::created_by_gamma_launcher()) {
1800 // Support for the gamma launcher. Check for an
1801 // JAVA_HOME environment variable
1802 // and fix up the path so it looks like
1803 // libjvm.so is installed there (append a fake suffix
1804 // hotspot/libjvm.so).
1805 char* java_home_var = ::getenv("JAVA_HOME");
1806 if (java_home_var != NULL && java_home_var[0] != 0) {
1808 strncpy(buf, java_home_var, buflen);
1810 // determine if this is a legacy image or modules image
1811 // modules image doesn't have "jre" subdirectory
1812 size_t len = strlen(buf);
1813 char* jrebin_p = buf + len;
1814 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1815 if (0 != _access(buf, 0)) {
1816 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1817 }
1818 len = strlen(buf);
1819 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1820 }
1821 }
1823 if(buf[0] == '\0') {
1824 GetModuleFileName(vm_lib_handle, buf, buflen);
1825 }
1826 strcpy(saved_jvm_path, buf);
1827 }
1830 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1831 #ifndef _WIN64
1832 st->print("_");
1833 #endif
1834 }
1837 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1838 #ifndef _WIN64
1839 st->print("@%d", args_size * sizeof(int));
1840 #endif
1841 }
1843 // This method is a copy of JDK's sysGetLastErrorString
1844 // from src/windows/hpi/src/system_md.c
1846 size_t os::lasterror(char* buf, size_t len) {
1847 DWORD errval;
1849 if ((errval = GetLastError()) != 0) {
1850 // DOS error
1851 size_t n = (size_t)FormatMessage(
1852 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1853 NULL,
1854 errval,
1855 0,
1856 buf,
1857 (DWORD)len,
1858 NULL);
1859 if (n > 3) {
1860 // Drop final '.', CR, LF
1861 if (buf[n - 1] == '\n') n--;
1862 if (buf[n - 1] == '\r') n--;
1863 if (buf[n - 1] == '.') n--;
1864 buf[n] = '\0';
1865 }
1866 return n;
1867 }
1869 if (errno != 0) {
1870 // C runtime error that has no corresponding DOS error code
1871 const char* s = strerror(errno);
1872 size_t n = strlen(s);
1873 if (n >= len) n = len - 1;
1874 strncpy(buf, s, n);
1875 buf[n] = '\0';
1876 return n;
1877 }
1879 return 0;
1880 }
1882 int os::get_last_error() {
1883 DWORD error = GetLastError();
1884 if (error == 0)
1885 error = errno;
1886 return (int)error;
1887 }
1889 // sun.misc.Signal
1890 // NOTE that this is a workaround for an apparent kernel bug where if
1891 // a signal handler for SIGBREAK is installed then that signal handler
1892 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1893 // See bug 4416763.
1894 static void (*sigbreakHandler)(int) = NULL;
1896 static void UserHandler(int sig, void *siginfo, void *context) {
1897 os::signal_notify(sig);
1898 // We need to reinstate the signal handler each time...
1899 os::signal(sig, (void*)UserHandler);
1900 }
1902 void* os::user_handler() {
1903 return (void*) UserHandler;
1904 }
1906 void* os::signal(int signal_number, void* handler) {
1907 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1908 void (*oldHandler)(int) = sigbreakHandler;
1909 sigbreakHandler = (void (*)(int)) handler;
1910 return (void*) oldHandler;
1911 } else {
1912 return (void*)::signal(signal_number, (void (*)(int))handler);
1913 }
1914 }
1916 void os::signal_raise(int signal_number) {
1917 raise(signal_number);
1918 }
1920 // The Win32 C runtime library maps all console control events other than ^C
1921 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1922 // logoff, and shutdown events. We therefore install our own console handler
1923 // that raises SIGTERM for the latter cases.
1924 //
1925 static BOOL WINAPI consoleHandler(DWORD event) {
1926 switch(event) {
1927 case CTRL_C_EVENT:
1928 if (is_error_reported()) {
1929 // Ctrl-C is pressed during error reporting, likely because the error
1930 // handler fails to abort. Let VM die immediately.
1931 os::die();
1932 }
1934 os::signal_raise(SIGINT);
1935 return TRUE;
1936 break;
1937 case CTRL_BREAK_EVENT:
1938 if (sigbreakHandler != NULL) {
1939 (*sigbreakHandler)(SIGBREAK);
1940 }
1941 return TRUE;
1942 break;
1943 case CTRL_LOGOFF_EVENT: {
1944 // Don't terminate JVM if it is running in a non-interactive session,
1945 // such as a service process.
1946 USEROBJECTFLAGS flags;
1947 HANDLE handle = GetProcessWindowStation();
1948 if (handle != NULL &&
1949 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1950 sizeof( USEROBJECTFLAGS), NULL)) {
1951 // If it is a non-interactive session, let next handler to deal
1952 // with it.
1953 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1954 return FALSE;
1955 }
1956 }
1957 }
1958 case CTRL_CLOSE_EVENT:
1959 case CTRL_SHUTDOWN_EVENT:
1960 os::signal_raise(SIGTERM);
1961 return TRUE;
1962 break;
1963 default:
1964 break;
1965 }
1966 return FALSE;
1967 }
1969 /*
1970 * The following code is moved from os.cpp for making this
1971 * code platform specific, which it is by its very nature.
1972 */
1974 // Return maximum OS signal used + 1 for internal use only
1975 // Used as exit signal for signal_thread
1976 int os::sigexitnum_pd(){
1977 return NSIG;
1978 }
1980 // a counter for each possible signal value, including signal_thread exit signal
1981 static volatile jint pending_signals[NSIG+1] = { 0 };
1982 static HANDLE sig_sem = NULL;
1984 void os::signal_init_pd() {
1985 // Initialize signal structures
1986 memset((void*)pending_signals, 0, sizeof(pending_signals));
1988 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
1990 // Programs embedding the VM do not want it to attempt to receive
1991 // events like CTRL_LOGOFF_EVENT, which are used to implement the
1992 // shutdown hooks mechanism introduced in 1.3. For example, when
1993 // the VM is run as part of a Windows NT service (i.e., a servlet
1994 // engine in a web server), the correct behavior is for any console
1995 // control handler to return FALSE, not TRUE, because the OS's
1996 // "final" handler for such events allows the process to continue if
1997 // it is a service (while terminating it if it is not a service).
1998 // To make this behavior uniform and the mechanism simpler, we
1999 // completely disable the VM's usage of these console events if -Xrs
2000 // (=ReduceSignalUsage) is specified. This means, for example, that
2001 // the CTRL-BREAK thread dump mechanism is also disabled in this
2002 // case. See bugs 4323062, 4345157, and related bugs.
2004 if (!ReduceSignalUsage) {
2005 // Add a CTRL-C handler
2006 SetConsoleCtrlHandler(consoleHandler, TRUE);
2007 }
2008 }
2010 void os::signal_notify(int signal_number) {
2011 BOOL ret;
2012 if (sig_sem != NULL) {
2013 Atomic::inc(&pending_signals[signal_number]);
2014 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2015 assert(ret != 0, "ReleaseSemaphore() failed");
2016 }
2017 }
2019 static int check_pending_signals(bool wait_for_signal) {
2020 DWORD ret;
2021 while (true) {
2022 for (int i = 0; i < NSIG + 1; i++) {
2023 jint n = pending_signals[i];
2024 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2025 return i;
2026 }
2027 }
2028 if (!wait_for_signal) {
2029 return -1;
2030 }
2032 JavaThread *thread = JavaThread::current();
2034 ThreadBlockInVM tbivm(thread);
2036 bool threadIsSuspended;
2037 do {
2038 thread->set_suspend_equivalent();
2039 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2040 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2041 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2043 // were we externally suspended while we were waiting?
2044 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2045 if (threadIsSuspended) {
2046 //
2047 // The semaphore has been incremented, but while we were waiting
2048 // another thread suspended us. We don't want to continue running
2049 // while suspended because that would surprise the thread that
2050 // suspended us.
2051 //
2052 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2053 assert(ret != 0, "ReleaseSemaphore() failed");
2055 thread->java_suspend_self();
2056 }
2057 } while (threadIsSuspended);
2058 }
2059 }
2061 int os::signal_lookup() {
2062 return check_pending_signals(false);
2063 }
2065 int os::signal_wait() {
2066 return check_pending_signals(true);
2067 }
2069 // Implicit OS exception handling
2071 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2072 JavaThread* thread = JavaThread::current();
2073 // Save pc in thread
2074 #ifdef _M_IA64
2075 // Do not blow up if no thread info available.
2076 if (thread) {
2077 // Saving PRECISE pc (with slot information) in thread.
2078 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2079 // Convert precise PC into "Unix" format
2080 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2081 thread->set_saved_exception_pc((address)precise_pc);
2082 }
2083 // Set pc to handler
2084 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2085 // Clear out psr.ri (= Restart Instruction) in order to continue
2086 // at the beginning of the target bundle.
2087 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2088 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2089 #elif _M_AMD64
2090 // Do not blow up if no thread info available.
2091 if (thread) {
2092 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2093 }
2094 // Set pc to handler
2095 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2096 #else
2097 // Do not blow up if no thread info available.
2098 if (thread) {
2099 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2100 }
2101 // Set pc to handler
2102 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2103 #endif
2105 // Continue the execution
2106 return EXCEPTION_CONTINUE_EXECUTION;
2107 }
2110 // Used for PostMortemDump
2111 extern "C" void safepoints();
2112 extern "C" void find(int x);
2113 extern "C" void events();
2115 // According to Windows API documentation, an illegal instruction sequence should generate
2116 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2117 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2118 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2120 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2122 // From "Execution Protection in the Windows Operating System" draft 0.35
2123 // Once a system header becomes available, the "real" define should be
2124 // included or copied here.
2125 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2127 // Handle NAT Bit consumption on IA64.
2128 #ifdef _M_IA64
2129 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2130 #endif
2132 // Windows Vista/2008 heap corruption check
2133 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2135 #define def_excpt(val) #val, val
2137 struct siglabel {
2138 char *name;
2139 int number;
2140 };
2142 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2143 // C++ compiler contain this error code. Because this is a compiler-generated
2144 // error, the code is not listed in the Win32 API header files.
2145 // The code is actually a cryptic mnemonic device, with the initial "E"
2146 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2147 // ASCII values of "msc".
2149 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2152 struct siglabel exceptlabels[] = {
2153 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2154 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2155 def_excpt(EXCEPTION_BREAKPOINT),
2156 def_excpt(EXCEPTION_SINGLE_STEP),
2157 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2158 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2159 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2160 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2161 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2162 def_excpt(EXCEPTION_FLT_OVERFLOW),
2163 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2164 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2165 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2166 def_excpt(EXCEPTION_INT_OVERFLOW),
2167 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2168 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2169 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2170 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2171 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2172 def_excpt(EXCEPTION_STACK_OVERFLOW),
2173 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2174 def_excpt(EXCEPTION_GUARD_PAGE),
2175 def_excpt(EXCEPTION_INVALID_HANDLE),
2176 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2177 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2178 #ifdef _M_IA64
2179 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2180 #endif
2181 NULL, 0
2182 };
2184 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2185 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2186 if (exceptlabels[i].number == exception_code) {
2187 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2188 return buf;
2189 }
2190 }
2192 return NULL;
2193 }
2195 //-----------------------------------------------------------------------------
2196 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2197 // handle exception caused by idiv; should only happen for -MinInt/-1
2198 // (division by zero is handled explicitly)
2199 #ifdef _M_IA64
2200 assert(0, "Fix Handle_IDiv_Exception");
2201 #elif _M_AMD64
2202 PCONTEXT ctx = exceptionInfo->ContextRecord;
2203 address pc = (address)ctx->Rip;
2204 assert(pc[0] == 0xF7, "not an idiv opcode");
2205 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2206 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2207 // set correct result values and continue after idiv instruction
2208 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2209 ctx->Rax = (DWORD)min_jint; // result
2210 ctx->Rdx = (DWORD)0; // remainder
2211 // Continue the execution
2212 #else
2213 PCONTEXT ctx = exceptionInfo->ContextRecord;
2214 address pc = (address)ctx->Eip;
2215 assert(pc[0] == 0xF7, "not an idiv opcode");
2216 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2217 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2218 // set correct result values and continue after idiv instruction
2219 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2220 ctx->Eax = (DWORD)min_jint; // result
2221 ctx->Edx = (DWORD)0; // remainder
2222 // Continue the execution
2223 #endif
2224 return EXCEPTION_CONTINUE_EXECUTION;
2225 }
2227 #ifndef _WIN64
2228 //-----------------------------------------------------------------------------
2229 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2230 // handle exception caused by native method modifying control word
2231 PCONTEXT ctx = exceptionInfo->ContextRecord;
2232 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2234 switch (exception_code) {
2235 case EXCEPTION_FLT_DENORMAL_OPERAND:
2236 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2237 case EXCEPTION_FLT_INEXACT_RESULT:
2238 case EXCEPTION_FLT_INVALID_OPERATION:
2239 case EXCEPTION_FLT_OVERFLOW:
2240 case EXCEPTION_FLT_STACK_CHECK:
2241 case EXCEPTION_FLT_UNDERFLOW:
2242 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2243 if (fp_control_word != ctx->FloatSave.ControlWord) {
2244 // Restore FPCW and mask out FLT exceptions
2245 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2246 // Mask out pending FLT exceptions
2247 ctx->FloatSave.StatusWord &= 0xffffff00;
2248 return EXCEPTION_CONTINUE_EXECUTION;
2249 }
2250 }
2252 if (prev_uef_handler != NULL) {
2253 // We didn't handle this exception so pass it to the previous
2254 // UnhandledExceptionFilter.
2255 return (prev_uef_handler)(exceptionInfo);
2256 }
2258 return EXCEPTION_CONTINUE_SEARCH;
2259 }
2260 #else //_WIN64
2261 /*
2262 On Windows, the mxcsr control bits are non-volatile across calls
2263 See also CR 6192333
2264 If EXCEPTION_FLT_* happened after some native method modified
2265 mxcsr - it is not a jvm fault.
2266 However should we decide to restore of mxcsr after a faulty
2267 native method we can uncomment following code
2268 jint MxCsr = INITIAL_MXCSR;
2269 // we can't use StubRoutines::addr_mxcsr_std()
2270 // because in Win64 mxcsr is not saved there
2271 if (MxCsr != ctx->MxCsr) {
2272 ctx->MxCsr = MxCsr;
2273 return EXCEPTION_CONTINUE_EXECUTION;
2274 }
2276 */
2277 #endif //_WIN64
2280 // Fatal error reporting is single threaded so we can make this a
2281 // static and preallocated. If it's more than MAX_PATH silently ignore
2282 // it.
2283 static char saved_error_file[MAX_PATH] = {0};
2285 void os::set_error_file(const char *logfile) {
2286 if (strlen(logfile) <= MAX_PATH) {
2287 strncpy(saved_error_file, logfile, MAX_PATH);
2288 }
2289 }
2291 static inline void report_error(Thread* t, DWORD exception_code,
2292 address addr, void* siginfo, void* context) {
2293 VMError err(t, exception_code, addr, siginfo, context);
2294 err.report_and_die();
2296 // If UseOsErrorReporting, this will return here and save the error file
2297 // somewhere where we can find it in the minidump.
2298 }
2300 //-----------------------------------------------------------------------------
2301 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2302 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2303 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2304 #ifdef _M_IA64
2305 // On Itanium, we need the "precise pc", which has the slot number coded
2306 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2307 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2308 // Convert the pc to "Unix format", which has the slot number coded
2309 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2310 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2311 // information is saved in the Unix format.
2312 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2313 #elif _M_AMD64
2314 address pc = (address) exceptionInfo->ContextRecord->Rip;
2315 #else
2316 address pc = (address) exceptionInfo->ContextRecord->Eip;
2317 #endif
2318 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2320 // Handle SafeFetch32 and SafeFetchN exceptions.
2321 if (StubRoutines::is_safefetch_fault(pc)) {
2322 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2323 }
2325 #ifndef _WIN64
2326 // Execution protection violation - win32 running on AMD64 only
2327 // Handled first to avoid misdiagnosis as a "normal" access violation;
2328 // This is safe to do because we have a new/unique ExceptionInformation
2329 // code for this condition.
2330 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2331 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2332 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2333 address addr = (address) exceptionRecord->ExceptionInformation[1];
2335 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2336 int page_size = os::vm_page_size();
2338 // Make sure the pc and the faulting address are sane.
2339 //
2340 // If an instruction spans a page boundary, and the page containing
2341 // the beginning of the instruction is executable but the following
2342 // page is not, the pc and the faulting address might be slightly
2343 // different - we still want to unguard the 2nd page in this case.
2344 //
2345 // 15 bytes seems to be a (very) safe value for max instruction size.
2346 bool pc_is_near_addr =
2347 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2348 bool instr_spans_page_boundary =
2349 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2350 (intptr_t) page_size) > 0);
2352 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2353 static volatile address last_addr =
2354 (address) os::non_memory_address_word();
2356 // In conservative mode, don't unguard unless the address is in the VM
2357 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2358 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2360 // Set memory to RWX and retry
2361 address page_start =
2362 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2363 bool res = os::protect_memory((char*) page_start, page_size,
2364 os::MEM_PROT_RWX);
2366 if (PrintMiscellaneous && Verbose) {
2367 char buf[256];
2368 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2369 "at " INTPTR_FORMAT
2370 ", unguarding " INTPTR_FORMAT ": %s", addr,
2371 page_start, (res ? "success" : strerror(errno)));
2372 tty->print_raw_cr(buf);
2373 }
2375 // Set last_addr so if we fault again at the same address, we don't
2376 // end up in an endless loop.
2377 //
2378 // There are two potential complications here. Two threads trapping
2379 // at the same address at the same time could cause one of the
2380 // threads to think it already unguarded, and abort the VM. Likely
2381 // very rare.
2382 //
2383 // The other race involves two threads alternately trapping at
2384 // different addresses and failing to unguard the page, resulting in
2385 // an endless loop. This condition is probably even more unlikely
2386 // than the first.
2387 //
2388 // Although both cases could be avoided by using locks or thread
2389 // local last_addr, these solutions are unnecessary complication:
2390 // this handler is a best-effort safety net, not a complete solution.
2391 // It is disabled by default and should only be used as a workaround
2392 // in case we missed any no-execute-unsafe VM code.
2394 last_addr = addr;
2396 return EXCEPTION_CONTINUE_EXECUTION;
2397 }
2398 }
2400 // Last unguard failed or not unguarding
2401 tty->print_raw_cr("Execution protection violation");
2402 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2403 exceptionInfo->ContextRecord);
2404 return EXCEPTION_CONTINUE_SEARCH;
2405 }
2406 }
2407 #endif // _WIN64
2409 // Check to see if we caught the safepoint code in the
2410 // process of write protecting the memory serialization page.
2411 // It write enables the page immediately after protecting it
2412 // so just return.
2413 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2414 JavaThread* thread = (JavaThread*) t;
2415 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2416 address addr = (address) exceptionRecord->ExceptionInformation[1];
2417 if ( os::is_memory_serialize_page(thread, addr) ) {
2418 // Block current thread until the memory serialize page permission restored.
2419 os::block_on_serialize_page_trap();
2420 return EXCEPTION_CONTINUE_EXECUTION;
2421 }
2422 }
2424 if (t != NULL && t->is_Java_thread()) {
2425 JavaThread* thread = (JavaThread*) t;
2426 bool in_java = thread->thread_state() == _thread_in_Java;
2428 // Handle potential stack overflows up front.
2429 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2430 if (os::uses_stack_guard_pages()) {
2431 #ifdef _M_IA64
2432 // Use guard page for register stack.
2433 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2434 address addr = (address) exceptionRecord->ExceptionInformation[1];
2435 // Check for a register stack overflow on Itanium
2436 if (thread->addr_inside_register_stack_red_zone(addr)) {
2437 // Fatal red zone violation happens if the Java program
2438 // catches a StackOverflow error and does so much processing
2439 // that it runs beyond the unprotected yellow guard zone. As
2440 // a result, we are out of here.
2441 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2442 } else if(thread->addr_inside_register_stack(addr)) {
2443 // Disable the yellow zone which sets the state that
2444 // we've got a stack overflow problem.
2445 if (thread->stack_yellow_zone_enabled()) {
2446 thread->disable_stack_yellow_zone();
2447 }
2448 // Give us some room to process the exception.
2449 thread->disable_register_stack_guard();
2450 // Tracing with +Verbose.
2451 if (Verbose) {
2452 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2453 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2454 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2455 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2456 thread->register_stack_base(),
2457 thread->register_stack_base() + thread->stack_size());
2458 }
2460 // Reguard the permanent register stack red zone just to be sure.
2461 // We saw Windows silently disabling this without telling us.
2462 thread->enable_register_stack_red_zone();
2464 return Handle_Exception(exceptionInfo,
2465 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2466 }
2467 #endif
2468 if (thread->stack_yellow_zone_enabled()) {
2469 // Yellow zone violation. The o/s has unprotected the first yellow
2470 // zone page for us. Note: must call disable_stack_yellow_zone to
2471 // update the enabled status, even if the zone contains only one page.
2472 thread->disable_stack_yellow_zone();
2473 // If not in java code, return and hope for the best.
2474 return in_java ? Handle_Exception(exceptionInfo,
2475 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2476 : EXCEPTION_CONTINUE_EXECUTION;
2477 } else {
2478 // Fatal red zone violation.
2479 thread->disable_stack_red_zone();
2480 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2481 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2482 exceptionInfo->ContextRecord);
2483 return EXCEPTION_CONTINUE_SEARCH;
2484 }
2485 } else if (in_java) {
2486 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2487 // a one-time-only guard page, which it has released to us. The next
2488 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2489 return Handle_Exception(exceptionInfo,
2490 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2491 } else {
2492 // Can only return and hope for the best. Further stack growth will
2493 // result in an ACCESS_VIOLATION.
2494 return EXCEPTION_CONTINUE_EXECUTION;
2495 }
2496 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2497 // Either stack overflow or null pointer exception.
2498 if (in_java) {
2499 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2500 address addr = (address) exceptionRecord->ExceptionInformation[1];
2501 address stack_end = thread->stack_base() - thread->stack_size();
2502 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2503 // Stack overflow.
2504 assert(!os::uses_stack_guard_pages(),
2505 "should be caught by red zone code above.");
2506 return Handle_Exception(exceptionInfo,
2507 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2508 }
2509 //
2510 // Check for safepoint polling and implicit null
2511 // We only expect null pointers in the stubs (vtable)
2512 // the rest are checked explicitly now.
2513 //
2514 CodeBlob* cb = CodeCache::find_blob(pc);
2515 if (cb != NULL) {
2516 if (os::is_poll_address(addr)) {
2517 address stub = SharedRuntime::get_poll_stub(pc);
2518 return Handle_Exception(exceptionInfo, stub);
2519 }
2520 }
2521 {
2522 #ifdef _WIN64
2523 //
2524 // If it's a legal stack address map the entire region in
2525 //
2526 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2527 address addr = (address) exceptionRecord->ExceptionInformation[1];
2528 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2529 addr = (address)((uintptr_t)addr &
2530 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2531 os::commit_memory((char *)addr, thread->stack_base() - addr,
2532 !ExecMem);
2533 return EXCEPTION_CONTINUE_EXECUTION;
2534 }
2535 else
2536 #endif
2537 {
2538 // Null pointer exception.
2539 #ifdef _M_IA64
2540 // Process implicit null checks in compiled code. Note: Implicit null checks
2541 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2542 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2543 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2544 // Handle implicit null check in UEP method entry
2545 if (cb && (cb->is_frame_complete_at(pc) ||
2546 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2547 if (Verbose) {
2548 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2549 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2550 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2551 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2552 *(bundle_start + 1), *bundle_start);
2553 }
2554 return Handle_Exception(exceptionInfo,
2555 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2556 }
2557 }
2559 // Implicit null checks were processed above. Hence, we should not reach
2560 // here in the usual case => die!
2561 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2562 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2563 exceptionInfo->ContextRecord);
2564 return EXCEPTION_CONTINUE_SEARCH;
2566 #else // !IA64
2568 // Windows 98 reports faulting addresses incorrectly
2569 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2570 !os::win32::is_nt()) {
2571 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2572 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2573 }
2574 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2575 exceptionInfo->ContextRecord);
2576 return EXCEPTION_CONTINUE_SEARCH;
2577 #endif
2578 }
2579 }
2580 }
2582 #ifdef _WIN64
2583 // Special care for fast JNI field accessors.
2584 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2585 // in and the heap gets shrunk before the field access.
2586 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2587 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2588 if (addr != (address)-1) {
2589 return Handle_Exception(exceptionInfo, addr);
2590 }
2591 }
2592 #endif
2594 // Stack overflow or null pointer exception in native code.
2595 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2596 exceptionInfo->ContextRecord);
2597 return EXCEPTION_CONTINUE_SEARCH;
2598 } // /EXCEPTION_ACCESS_VIOLATION
2599 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2600 #if defined _M_IA64
2601 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2602 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2603 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2605 // Compiled method patched to be non entrant? Following conditions must apply:
2606 // 1. must be first instruction in bundle
2607 // 2. must be a break instruction with appropriate code
2608 if((((uint64_t) pc & 0x0F) == 0) &&
2609 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2610 return Handle_Exception(exceptionInfo,
2611 (address)SharedRuntime::get_handle_wrong_method_stub());
2612 }
2613 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2614 #endif
2617 if (in_java) {
2618 switch (exception_code) {
2619 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2620 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2622 case EXCEPTION_INT_OVERFLOW:
2623 return Handle_IDiv_Exception(exceptionInfo);
2625 } // switch
2626 }
2627 #ifndef _WIN64
2628 if (((thread->thread_state() == _thread_in_Java) ||
2629 (thread->thread_state() == _thread_in_native)) &&
2630 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2631 {
2632 LONG result=Handle_FLT_Exception(exceptionInfo);
2633 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2634 }
2635 #endif //_WIN64
2636 }
2638 if (exception_code != EXCEPTION_BREAKPOINT) {
2639 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2640 exceptionInfo->ContextRecord);
2641 }
2642 return EXCEPTION_CONTINUE_SEARCH;
2643 }
2645 #ifndef _WIN64
2646 // Special care for fast JNI accessors.
2647 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2648 // the heap gets shrunk before the field access.
2649 // Need to install our own structured exception handler since native code may
2650 // install its own.
2651 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2652 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2653 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2654 address pc = (address) exceptionInfo->ContextRecord->Eip;
2655 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2656 if (addr != (address)-1) {
2657 return Handle_Exception(exceptionInfo, addr);
2658 }
2659 }
2660 return EXCEPTION_CONTINUE_SEARCH;
2661 }
2663 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2664 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2665 __try { \
2666 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2667 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2668 } \
2669 return 0; \
2670 }
2672 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2673 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2674 DEFINE_FAST_GETFIELD(jchar, char, Char)
2675 DEFINE_FAST_GETFIELD(jshort, short, Short)
2676 DEFINE_FAST_GETFIELD(jint, int, Int)
2677 DEFINE_FAST_GETFIELD(jlong, long, Long)
2678 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2679 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2681 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2682 switch (type) {
2683 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2684 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2685 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2686 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2687 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2688 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2689 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2690 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2691 default: ShouldNotReachHere();
2692 }
2693 return (address)-1;
2694 }
2695 #endif
2697 // Virtual Memory
2699 int os::vm_page_size() { return os::win32::vm_page_size(); }
2700 int os::vm_allocation_granularity() {
2701 return os::win32::vm_allocation_granularity();
2702 }
2704 // Windows large page support is available on Windows 2003. In order to use
2705 // large page memory, the administrator must first assign additional privilege
2706 // to the user:
2707 // + select Control Panel -> Administrative Tools -> Local Security Policy
2708 // + select Local Policies -> User Rights Assignment
2709 // + double click "Lock pages in memory", add users and/or groups
2710 // + reboot
2711 // Note the above steps are needed for administrator as well, as administrators
2712 // by default do not have the privilege to lock pages in memory.
2713 //
2714 // Note about Windows 2003: although the API supports committing large page
2715 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2716 // scenario, I found through experiment it only uses large page if the entire
2717 // memory region is reserved and committed in a single VirtualAlloc() call.
2718 // This makes Windows large page support more or less like Solaris ISM, in
2719 // that the entire heap must be committed upfront. This probably will change
2720 // in the future, if so the code below needs to be revisited.
2722 #ifndef MEM_LARGE_PAGES
2723 #define MEM_LARGE_PAGES 0x20000000
2724 #endif
2726 static HANDLE _hProcess;
2727 static HANDLE _hToken;
2729 // Container for NUMA node list info
2730 class NUMANodeListHolder {
2731 private:
2732 int *_numa_used_node_list; // allocated below
2733 int _numa_used_node_count;
2735 void free_node_list() {
2736 if (_numa_used_node_list != NULL) {
2737 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2738 }
2739 }
2741 public:
2742 NUMANodeListHolder() {
2743 _numa_used_node_count = 0;
2744 _numa_used_node_list = NULL;
2745 // do rest of initialization in build routine (after function pointers are set up)
2746 }
2748 ~NUMANodeListHolder() {
2749 free_node_list();
2750 }
2752 bool build() {
2753 DWORD_PTR proc_aff_mask;
2754 DWORD_PTR sys_aff_mask;
2755 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2756 ULONG highest_node_number;
2757 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2758 free_node_list();
2759 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2760 for (unsigned int i = 0; i <= highest_node_number; i++) {
2761 ULONGLONG proc_mask_numa_node;
2762 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2763 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2764 _numa_used_node_list[_numa_used_node_count++] = i;
2765 }
2766 }
2767 return (_numa_used_node_count > 1);
2768 }
2770 int get_count() {return _numa_used_node_count;}
2771 int get_node_list_entry(int n) {
2772 // for indexes out of range, returns -1
2773 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2774 }
2776 } numa_node_list_holder;
2780 static size_t _large_page_size = 0;
2782 static bool resolve_functions_for_large_page_init() {
2783 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2784 os::Advapi32Dll::AdvapiAvailable();
2785 }
2787 static bool request_lock_memory_privilege() {
2788 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2789 os::current_process_id());
2791 LUID luid;
2792 if (_hProcess != NULL &&
2793 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2794 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2796 TOKEN_PRIVILEGES tp;
2797 tp.PrivilegeCount = 1;
2798 tp.Privileges[0].Luid = luid;
2799 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2801 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2802 // privilege. Check GetLastError() too. See MSDN document.
2803 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2804 (GetLastError() == ERROR_SUCCESS)) {
2805 return true;
2806 }
2807 }
2809 return false;
2810 }
2812 static void cleanup_after_large_page_init() {
2813 if (_hProcess) CloseHandle(_hProcess);
2814 _hProcess = NULL;
2815 if (_hToken) CloseHandle(_hToken);
2816 _hToken = NULL;
2817 }
2819 static bool numa_interleaving_init() {
2820 bool success = false;
2821 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2823 // print a warning if UseNUMAInterleaving flag is specified on command line
2824 bool warn_on_failure = use_numa_interleaving_specified;
2825 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2827 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2828 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2829 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2831 if (os::Kernel32Dll::NumaCallsAvailable()) {
2832 if (numa_node_list_holder.build()) {
2833 if (PrintMiscellaneous && Verbose) {
2834 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2835 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2836 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2837 }
2838 tty->print("\n");
2839 }
2840 success = true;
2841 } else {
2842 WARN("Process does not cover multiple NUMA nodes.");
2843 }
2844 } else {
2845 WARN("NUMA Interleaving is not supported by the operating system.");
2846 }
2847 if (!success) {
2848 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2849 }
2850 return success;
2851 #undef WARN
2852 }
2854 // this routine is used whenever we need to reserve a contiguous VA range
2855 // but we need to make separate VirtualAlloc calls for each piece of the range
2856 // Reasons for doing this:
2857 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2858 // * UseNUMAInterleaving requires a separate node for each piece
2859 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2860 bool should_inject_error=false) {
2861 char * p_buf;
2862 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2863 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2864 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2866 // first reserve enough address space in advance since we want to be
2867 // able to break a single contiguous virtual address range into multiple
2868 // large page commits but WS2003 does not allow reserving large page space
2869 // so we just use 4K pages for reserve, this gives us a legal contiguous
2870 // address space. then we will deallocate that reservation, and re alloc
2871 // using large pages
2872 const size_t size_of_reserve = bytes + chunk_size;
2873 if (bytes > size_of_reserve) {
2874 // Overflowed.
2875 return NULL;
2876 }
2877 p_buf = (char *) VirtualAlloc(addr,
2878 size_of_reserve, // size of Reserve
2879 MEM_RESERVE,
2880 PAGE_READWRITE);
2881 // If reservation failed, return NULL
2882 if (p_buf == NULL) return NULL;
2883 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, mtNone, CALLER_PC);
2884 os::release_memory(p_buf, bytes + chunk_size);
2886 // we still need to round up to a page boundary (in case we are using large pages)
2887 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2888 // instead we handle this in the bytes_to_rq computation below
2889 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2891 // now go through and allocate one chunk at a time until all bytes are
2892 // allocated
2893 size_t bytes_remaining = bytes;
2894 // An overflow of align_size_up() would have been caught above
2895 // in the calculation of size_of_reserve.
2896 char * next_alloc_addr = p_buf;
2897 HANDLE hProc = GetCurrentProcess();
2899 #ifdef ASSERT
2900 // Variable for the failure injection
2901 long ran_num = os::random();
2902 size_t fail_after = ran_num % bytes;
2903 #endif
2905 int count=0;
2906 while (bytes_remaining) {
2907 // select bytes_to_rq to get to the next chunk_size boundary
2909 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2910 // Note allocate and commit
2911 char * p_new;
2913 #ifdef ASSERT
2914 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2915 #else
2916 const bool inject_error_now = false;
2917 #endif
2919 if (inject_error_now) {
2920 p_new = NULL;
2921 } else {
2922 if (!UseNUMAInterleaving) {
2923 p_new = (char *) VirtualAlloc(next_alloc_addr,
2924 bytes_to_rq,
2925 flags,
2926 prot);
2927 } else {
2928 // get the next node to use from the used_node_list
2929 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2930 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2931 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
2932 next_alloc_addr,
2933 bytes_to_rq,
2934 flags,
2935 prot,
2936 node);
2937 }
2938 }
2940 if (p_new == NULL) {
2941 // Free any allocated pages
2942 if (next_alloc_addr > p_buf) {
2943 // Some memory was committed so release it.
2944 size_t bytes_to_release = bytes - bytes_remaining;
2945 // NMT has yet to record any individual blocks, so it
2946 // need to create a dummy 'reserve' record to match
2947 // the release.
2948 MemTracker::record_virtual_memory_reserve((address)p_buf,
2949 bytes_to_release, mtNone, CALLER_PC);
2950 os::release_memory(p_buf, bytes_to_release);
2951 }
2952 #ifdef ASSERT
2953 if (should_inject_error) {
2954 if (TracePageSizes && Verbose) {
2955 tty->print_cr("Reserving pages individually failed.");
2956 }
2957 }
2958 #endif
2959 return NULL;
2960 }
2962 bytes_remaining -= bytes_to_rq;
2963 next_alloc_addr += bytes_to_rq;
2964 count++;
2965 }
2966 // Although the memory is allocated individually, it is returned as one.
2967 // NMT records it as one block.
2968 address pc = CALLER_PC;
2969 if ((flags & MEM_COMMIT) != 0) {
2970 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, mtNone, pc);
2971 } else {
2972 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, mtNone, pc);
2973 }
2975 // made it this far, success
2976 return p_buf;
2977 }
2981 void os::large_page_init() {
2982 if (!UseLargePages) return;
2984 // print a warning if any large page related flag is specified on command line
2985 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2986 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2987 bool success = false;
2989 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2990 if (resolve_functions_for_large_page_init()) {
2991 if (request_lock_memory_privilege()) {
2992 size_t s = os::Kernel32Dll::GetLargePageMinimum();
2993 if (s) {
2994 #if defined(IA32) || defined(AMD64)
2995 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2996 WARN("JVM cannot use large pages bigger than 4mb.");
2997 } else {
2998 #endif
2999 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3000 _large_page_size = LargePageSizeInBytes;
3001 } else {
3002 _large_page_size = s;
3003 }
3004 success = true;
3005 #if defined(IA32) || defined(AMD64)
3006 }
3007 #endif
3008 } else {
3009 WARN("Large page is not supported by the processor.");
3010 }
3011 } else {
3012 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3013 }
3014 } else {
3015 WARN("Large page is not supported by the operating system.");
3016 }
3017 #undef WARN
3019 const size_t default_page_size = (size_t) vm_page_size();
3020 if (success && _large_page_size > default_page_size) {
3021 _page_sizes[0] = _large_page_size;
3022 _page_sizes[1] = default_page_size;
3023 _page_sizes[2] = 0;
3024 }
3026 cleanup_after_large_page_init();
3027 UseLargePages = success;
3028 }
3030 // On win32, one cannot release just a part of reserved memory, it's an
3031 // all or nothing deal. When we split a reservation, we must break the
3032 // reservation into two reservations.
3033 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3034 bool realloc) {
3035 if (size > 0) {
3036 release_memory(base, size);
3037 if (realloc) {
3038 reserve_memory(split, base);
3039 }
3040 if (size != split) {
3041 reserve_memory(size - split, base + split);
3042 }
3043 }
3044 }
3046 // Multiple threads can race in this code but it's not possible to unmap small sections of
3047 // virtual space to get requested alignment, like posix-like os's.
3048 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3049 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3050 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3051 "Alignment must be a multiple of allocation granularity (page size)");
3052 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3054 size_t extra_size = size + alignment;
3055 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3057 char* aligned_base = NULL;
3059 do {
3060 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3061 if (extra_base == NULL) {
3062 return NULL;
3063 }
3064 // Do manual alignment
3065 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3067 os::release_memory(extra_base, extra_size);
3069 aligned_base = os::reserve_memory(size, aligned_base);
3071 } while (aligned_base == NULL);
3073 return aligned_base;
3074 }
3076 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3077 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3078 "reserve alignment");
3079 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3080 char* res;
3081 // note that if UseLargePages is on, all the areas that require interleaving
3082 // will go thru reserve_memory_special rather than thru here.
3083 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3084 if (!use_individual) {
3085 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3086 } else {
3087 elapsedTimer reserveTimer;
3088 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3089 // in numa interleaving, we have to allocate pages individually
3090 // (well really chunks of NUMAInterleaveGranularity size)
3091 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3092 if (res == NULL) {
3093 warning("NUMA page allocation failed");
3094 }
3095 if( Verbose && PrintMiscellaneous ) {
3096 reserveTimer.stop();
3097 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3098 reserveTimer.milliseconds(), reserveTimer.ticks());
3099 }
3100 }
3101 assert(res == NULL || addr == NULL || addr == res,
3102 "Unexpected address from reserve.");
3104 return res;
3105 }
3107 // Reserve memory at an arbitrary address, only if that area is
3108 // available (and not reserved for something else).
3109 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3110 // Windows os::reserve_memory() fails of the requested address range is
3111 // not avilable.
3112 return reserve_memory(bytes, requested_addr);
3113 }
3115 size_t os::large_page_size() {
3116 return _large_page_size;
3117 }
3119 bool os::can_commit_large_page_memory() {
3120 // Windows only uses large page memory when the entire region is reserved
3121 // and committed in a single VirtualAlloc() call. This may change in the
3122 // future, but with Windows 2003 it's not possible to commit on demand.
3123 return false;
3124 }
3126 bool os::can_execute_large_page_memory() {
3127 return true;
3128 }
3130 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3132 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3133 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3135 // with large pages, there are two cases where we need to use Individual Allocation
3136 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3137 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3138 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3139 if (TracePageSizes && Verbose) {
3140 tty->print_cr("Reserving large pages individually.");
3141 }
3142 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3143 if (p_buf == NULL) {
3144 // give an appropriate warning message
3145 if (UseNUMAInterleaving) {
3146 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3147 }
3148 if (UseLargePagesIndividualAllocation) {
3149 warning("Individually allocated large pages failed, "
3150 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3151 }
3152 return NULL;
3153 }
3155 return p_buf;
3157 } else {
3158 // normal policy just allocate it all at once
3159 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3160 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot);
3161 if (res != NULL) {
3162 address pc = CALLER_PC;
3163 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc);
3164 }
3166 return res;
3167 }
3168 }
3170 bool os::release_memory_special(char* base, size_t bytes) {
3171 assert(base != NULL, "Sanity check");
3172 return release_memory(base, bytes);
3173 }
3175 void os::print_statistics() {
3176 }
3178 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3179 int err = os::get_last_error();
3180 char buf[256];
3181 size_t buf_len = os::lasterror(buf, sizeof(buf));
3182 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3183 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3184 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3185 }
3187 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3188 if (bytes == 0) {
3189 // Don't bother the OS with noops.
3190 return true;
3191 }
3192 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3193 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3194 // Don't attempt to print anything if the OS call fails. We're
3195 // probably low on resources, so the print itself may cause crashes.
3197 // unless we have NUMAInterleaving enabled, the range of a commit
3198 // is always within a reserve covered by a single VirtualAlloc
3199 // in that case we can just do a single commit for the requested size
3200 if (!UseNUMAInterleaving) {
3201 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3202 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3203 return false;
3204 }
3205 if (exec) {
3206 DWORD oldprot;
3207 // Windows doc says to use VirtualProtect to get execute permissions
3208 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3209 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3210 return false;
3211 }
3212 }
3213 return true;
3214 } else {
3216 // when NUMAInterleaving is enabled, the commit might cover a range that
3217 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3218 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3219 // returns represents the number of bytes that can be committed in one step.
3220 size_t bytes_remaining = bytes;
3221 char * next_alloc_addr = addr;
3222 while (bytes_remaining > 0) {
3223 MEMORY_BASIC_INFORMATION alloc_info;
3224 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3225 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3226 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3227 PAGE_READWRITE) == NULL) {
3228 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3229 exec);)
3230 return false;
3231 }
3232 if (exec) {
3233 DWORD oldprot;
3234 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3235 PAGE_EXECUTE_READWRITE, &oldprot)) {
3236 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3237 exec);)
3238 return false;
3239 }
3240 }
3241 bytes_remaining -= bytes_to_rq;
3242 next_alloc_addr += bytes_to_rq;
3243 }
3244 }
3245 // if we made it this far, return true
3246 return true;
3247 }
3249 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3250 bool exec) {
3251 // alignment_hint is ignored on this OS
3252 return pd_commit_memory(addr, size, exec);
3253 }
3255 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3256 const char* mesg) {
3257 assert(mesg != NULL, "mesg must be specified");
3258 if (!pd_commit_memory(addr, size, exec)) {
3259 warn_fail_commit_memory(addr, size, exec);
3260 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3261 }
3262 }
3264 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3265 size_t alignment_hint, bool exec,
3266 const char* mesg) {
3267 // alignment_hint is ignored on this OS
3268 pd_commit_memory_or_exit(addr, size, exec, mesg);
3269 }
3271 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3272 if (bytes == 0) {
3273 // Don't bother the OS with noops.
3274 return true;
3275 }
3276 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3277 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3278 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3279 }
3281 bool os::pd_release_memory(char* addr, size_t bytes) {
3282 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3283 }
3285 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3286 return os::commit_memory(addr, size, !ExecMem);
3287 }
3289 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3290 return os::uncommit_memory(addr, size);
3291 }
3293 // Set protections specified
3294 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3295 bool is_committed) {
3296 unsigned int p = 0;
3297 switch (prot) {
3298 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3299 case MEM_PROT_READ: p = PAGE_READONLY; break;
3300 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3301 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3302 default:
3303 ShouldNotReachHere();
3304 }
3306 DWORD old_status;
3308 // Strange enough, but on Win32 one can change protection only for committed
3309 // memory, not a big deal anyway, as bytes less or equal than 64K
3310 if (!is_committed) {
3311 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3312 "cannot commit protection page");
3313 }
3314 // One cannot use os::guard_memory() here, as on Win32 guard page
3315 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3316 //
3317 // Pages in the region become guard pages. Any attempt to access a guard page
3318 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3319 // the guard page status. Guard pages thus act as a one-time access alarm.
3320 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3321 }
3323 bool os::guard_memory(char* addr, size_t bytes) {
3324 DWORD old_status;
3325 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3326 }
3328 bool os::unguard_memory(char* addr, size_t bytes) {
3329 DWORD old_status;
3330 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3331 }
3333 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3334 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3335 void os::numa_make_global(char *addr, size_t bytes) { }
3336 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3337 bool os::numa_topology_changed() { return false; }
3338 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3339 int os::numa_get_group_id() { return 0; }
3340 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3341 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3342 // Provide an answer for UMA systems
3343 ids[0] = 0;
3344 return 1;
3345 } else {
3346 // check for size bigger than actual groups_num
3347 size = MIN2(size, numa_get_groups_num());
3348 for (int i = 0; i < (int)size; i++) {
3349 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3350 }
3351 return size;
3352 }
3353 }
3355 bool os::get_page_info(char *start, page_info* info) {
3356 return false;
3357 }
3359 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3360 return end;
3361 }
3363 char* os::non_memory_address_word() {
3364 // Must never look like an address returned by reserve_memory,
3365 // even in its subfields (as defined by the CPU immediate fields,
3366 // if the CPU splits constants across multiple instructions).
3367 return (char*)-1;
3368 }
3370 #define MAX_ERROR_COUNT 100
3371 #define SYS_THREAD_ERROR 0xffffffffUL
3373 void os::pd_start_thread(Thread* thread) {
3374 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3375 // Returns previous suspend state:
3376 // 0: Thread was not suspended
3377 // 1: Thread is running now
3378 // >1: Thread is still suspended.
3379 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3380 }
3382 class HighResolutionInterval : public CHeapObj<mtThread> {
3383 // The default timer resolution seems to be 10 milliseconds.
3384 // (Where is this written down?)
3385 // If someone wants to sleep for only a fraction of the default,
3386 // then we set the timer resolution down to 1 millisecond for
3387 // the duration of their interval.
3388 // We carefully set the resolution back, since otherwise we
3389 // seem to incur an overhead (3%?) that we don't need.
3390 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3391 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3392 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3393 // timeBeginPeriod() if the relative error exceeded some threshold.
3394 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3395 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3396 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3397 // resolution timers running.
3398 private:
3399 jlong resolution;
3400 public:
3401 HighResolutionInterval(jlong ms) {
3402 resolution = ms % 10L;
3403 if (resolution != 0) {
3404 MMRESULT result = timeBeginPeriod(1L);
3405 }
3406 }
3407 ~HighResolutionInterval() {
3408 if (resolution != 0) {
3409 MMRESULT result = timeEndPeriod(1L);
3410 }
3411 resolution = 0L;
3412 }
3413 };
3415 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3416 jlong limit = (jlong) MAXDWORD;
3418 while(ms > limit) {
3419 int res;
3420 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3421 return res;
3422 ms -= limit;
3423 }
3425 assert(thread == Thread::current(), "thread consistency check");
3426 OSThread* osthread = thread->osthread();
3427 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3428 int result;
3429 if (interruptable) {
3430 assert(thread->is_Java_thread(), "must be java thread");
3431 JavaThread *jt = (JavaThread *) thread;
3432 ThreadBlockInVM tbivm(jt);
3434 jt->set_suspend_equivalent();
3435 // cleared by handle_special_suspend_equivalent_condition() or
3436 // java_suspend_self() via check_and_wait_while_suspended()
3438 HANDLE events[1];
3439 events[0] = osthread->interrupt_event();
3440 HighResolutionInterval *phri=NULL;
3441 if(!ForceTimeHighResolution)
3442 phri = new HighResolutionInterval( ms );
3443 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3444 result = OS_TIMEOUT;
3445 } else {
3446 ResetEvent(osthread->interrupt_event());
3447 osthread->set_interrupted(false);
3448 result = OS_INTRPT;
3449 }
3450 delete phri; //if it is NULL, harmless
3452 // were we externally suspended while we were waiting?
3453 jt->check_and_wait_while_suspended();
3454 } else {
3455 assert(!thread->is_Java_thread(), "must not be java thread");
3456 Sleep((long) ms);
3457 result = OS_TIMEOUT;
3458 }
3459 return result;
3460 }
3462 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3463 void os::infinite_sleep() {
3464 while (true) { // sleep forever ...
3465 Sleep(100000); // ... 100 seconds at a time
3466 }
3467 }
3469 typedef BOOL (WINAPI * STTSignature)(void) ;
3471 os::YieldResult os::NakedYield() {
3472 // Use either SwitchToThread() or Sleep(0)
3473 // Consider passing back the return value from SwitchToThread().
3474 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3475 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3476 } else {
3477 Sleep(0);
3478 }
3479 return os::YIELD_UNKNOWN ;
3480 }
3482 void os::yield() { os::NakedYield(); }
3484 void os::yield_all(int attempts) {
3485 // Yields to all threads, including threads with lower priorities
3486 Sleep(1);
3487 }
3489 // Win32 only gives you access to seven real priorities at a time,
3490 // so we compress Java's ten down to seven. It would be better
3491 // if we dynamically adjusted relative priorities.
3493 int os::java_to_os_priority[CriticalPriority + 1] = {
3494 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3495 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3496 THREAD_PRIORITY_LOWEST, // 2
3497 THREAD_PRIORITY_BELOW_NORMAL, // 3
3498 THREAD_PRIORITY_BELOW_NORMAL, // 4
3499 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3500 THREAD_PRIORITY_NORMAL, // 6
3501 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3502 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3503 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3504 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3505 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3506 };
3508 int prio_policy1[CriticalPriority + 1] = {
3509 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3510 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3511 THREAD_PRIORITY_LOWEST, // 2
3512 THREAD_PRIORITY_BELOW_NORMAL, // 3
3513 THREAD_PRIORITY_BELOW_NORMAL, // 4
3514 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3515 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3516 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3517 THREAD_PRIORITY_HIGHEST, // 8
3518 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3519 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3520 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3521 };
3523 static int prio_init() {
3524 // If ThreadPriorityPolicy is 1, switch tables
3525 if (ThreadPriorityPolicy == 1) {
3526 int i;
3527 for (i = 0; i < CriticalPriority + 1; i++) {
3528 os::java_to_os_priority[i] = prio_policy1[i];
3529 }
3530 }
3531 if (UseCriticalJavaThreadPriority) {
3532 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3533 }
3534 return 0;
3535 }
3537 OSReturn os::set_native_priority(Thread* thread, int priority) {
3538 if (!UseThreadPriorities) return OS_OK;
3539 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3540 return ret ? OS_OK : OS_ERR;
3541 }
3543 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3544 if ( !UseThreadPriorities ) {
3545 *priority_ptr = java_to_os_priority[NormPriority];
3546 return OS_OK;
3547 }
3548 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3549 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3550 assert(false, "GetThreadPriority failed");
3551 return OS_ERR;
3552 }
3553 *priority_ptr = os_prio;
3554 return OS_OK;
3555 }
3558 // Hint to the underlying OS that a task switch would not be good.
3559 // Void return because it's a hint and can fail.
3560 void os::hint_no_preempt() {}
3562 void os::interrupt(Thread* thread) {
3563 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3564 "possibility of dangling Thread pointer");
3566 OSThread* osthread = thread->osthread();
3567 osthread->set_interrupted(true);
3568 // More than one thread can get here with the same value of osthread,
3569 // resulting in multiple notifications. We do, however, want the store
3570 // to interrupted() to be visible to other threads before we post
3571 // the interrupt event.
3572 OrderAccess::release();
3573 SetEvent(osthread->interrupt_event());
3574 // For JSR166: unpark after setting status
3575 if (thread->is_Java_thread())
3576 ((JavaThread*)thread)->parker()->unpark();
3578 ParkEvent * ev = thread->_ParkEvent ;
3579 if (ev != NULL) ev->unpark() ;
3581 }
3584 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3585 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3586 "possibility of dangling Thread pointer");
3588 OSThread* osthread = thread->osthread();
3589 bool interrupted = osthread->interrupted();
3590 // There is no synchronization between the setting of the interrupt
3591 // and it being cleared here. It is critical - see 6535709 - that
3592 // we only clear the interrupt state, and reset the interrupt event,
3593 // if we are going to report that we were indeed interrupted - else
3594 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3595 // depending on the timing
3596 if (interrupted && clear_interrupted) {
3597 osthread->set_interrupted(false);
3598 ResetEvent(osthread->interrupt_event());
3599 } // Otherwise leave the interrupted state alone
3601 return interrupted;
3602 }
3604 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3605 ExtendedPC os::get_thread_pc(Thread* thread) {
3606 CONTEXT context;
3607 context.ContextFlags = CONTEXT_CONTROL;
3608 HANDLE handle = thread->osthread()->thread_handle();
3609 #ifdef _M_IA64
3610 assert(0, "Fix get_thread_pc");
3611 return ExtendedPC(NULL);
3612 #else
3613 if (GetThreadContext(handle, &context)) {
3614 #ifdef _M_AMD64
3615 return ExtendedPC((address) context.Rip);
3616 #else
3617 return ExtendedPC((address) context.Eip);
3618 #endif
3619 } else {
3620 return ExtendedPC(NULL);
3621 }
3622 #endif
3623 }
3625 // GetCurrentThreadId() returns DWORD
3626 intx os::current_thread_id() { return GetCurrentThreadId(); }
3628 static int _initial_pid = 0;
3630 int os::current_process_id()
3631 {
3632 return (_initial_pid ? _initial_pid : _getpid());
3633 }
3635 int os::win32::_vm_page_size = 0;
3636 int os::win32::_vm_allocation_granularity = 0;
3637 int os::win32::_processor_type = 0;
3638 // Processor level is not available on non-NT systems, use vm_version instead
3639 int os::win32::_processor_level = 0;
3640 julong os::win32::_physical_memory = 0;
3641 size_t os::win32::_default_stack_size = 0;
3643 intx os::win32::_os_thread_limit = 0;
3644 volatile intx os::win32::_os_thread_count = 0;
3646 bool os::win32::_is_nt = false;
3647 bool os::win32::_is_windows_2003 = false;
3648 bool os::win32::_is_windows_server = false;
3650 void os::win32::initialize_system_info() {
3651 SYSTEM_INFO si;
3652 GetSystemInfo(&si);
3653 _vm_page_size = si.dwPageSize;
3654 _vm_allocation_granularity = si.dwAllocationGranularity;
3655 _processor_type = si.dwProcessorType;
3656 _processor_level = si.wProcessorLevel;
3657 set_processor_count(si.dwNumberOfProcessors);
3659 MEMORYSTATUSEX ms;
3660 ms.dwLength = sizeof(ms);
3662 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3663 // dwMemoryLoad (% of memory in use)
3664 GlobalMemoryStatusEx(&ms);
3665 _physical_memory = ms.ullTotalPhys;
3667 OSVERSIONINFOEX oi;
3668 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3669 GetVersionEx((OSVERSIONINFO*)&oi);
3670 switch(oi.dwPlatformId) {
3671 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3672 case VER_PLATFORM_WIN32_NT:
3673 _is_nt = true;
3674 {
3675 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3676 if (os_vers == 5002) {
3677 _is_windows_2003 = true;
3678 }
3679 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3680 oi.wProductType == VER_NT_SERVER) {
3681 _is_windows_server = true;
3682 }
3683 }
3684 break;
3685 default: fatal("Unknown platform");
3686 }
3688 _default_stack_size = os::current_stack_size();
3689 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3690 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3691 "stack size not a multiple of page size");
3693 initialize_performance_counter();
3695 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3696 // known to deadlock the system, if the VM issues to thread operations with
3697 // a too high frequency, e.g., such as changing the priorities.
3698 // The 6000 seems to work well - no deadlocks has been notices on the test
3699 // programs that we have seen experience this problem.
3700 if (!os::win32::is_nt()) {
3701 StarvationMonitorInterval = 6000;
3702 }
3703 }
3706 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3707 char path[MAX_PATH];
3708 DWORD size;
3709 DWORD pathLen = (DWORD)sizeof(path);
3710 HINSTANCE result = NULL;
3712 // only allow library name without path component
3713 assert(strchr(name, '\\') == NULL, "path not allowed");
3714 assert(strchr(name, ':') == NULL, "path not allowed");
3715 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3716 jio_snprintf(ebuf, ebuflen,
3717 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3718 return NULL;
3719 }
3721 // search system directory
3722 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3723 strcat(path, "\\");
3724 strcat(path, name);
3725 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3726 return result;
3727 }
3728 }
3730 // try Windows directory
3731 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3732 strcat(path, "\\");
3733 strcat(path, name);
3734 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3735 return result;
3736 }
3737 }
3739 jio_snprintf(ebuf, ebuflen,
3740 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3741 return NULL;
3742 }
3744 void os::win32::setmode_streams() {
3745 _setmode(_fileno(stdin), _O_BINARY);
3746 _setmode(_fileno(stdout), _O_BINARY);
3747 _setmode(_fileno(stderr), _O_BINARY);
3748 }
3751 bool os::is_debugger_attached() {
3752 return IsDebuggerPresent() ? true : false;
3753 }
3756 void os::wait_for_keypress_at_exit(void) {
3757 if (PauseAtExit) {
3758 fprintf(stderr, "Press any key to continue...\n");
3759 fgetc(stdin);
3760 }
3761 }
3764 int os::message_box(const char* title, const char* message) {
3765 int result = MessageBox(NULL, message, title,
3766 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3767 return result == IDYES;
3768 }
3770 int os::allocate_thread_local_storage() {
3771 return TlsAlloc();
3772 }
3775 void os::free_thread_local_storage(int index) {
3776 TlsFree(index);
3777 }
3780 void os::thread_local_storage_at_put(int index, void* value) {
3781 TlsSetValue(index, value);
3782 assert(thread_local_storage_at(index) == value, "Just checking");
3783 }
3786 void* os::thread_local_storage_at(int index) {
3787 return TlsGetValue(index);
3788 }
3791 #ifndef PRODUCT
3792 #ifndef _WIN64
3793 // Helpers to check whether NX protection is enabled
3794 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3795 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3796 pex->ExceptionRecord->NumberParameters > 0 &&
3797 pex->ExceptionRecord->ExceptionInformation[0] ==
3798 EXCEPTION_INFO_EXEC_VIOLATION) {
3799 return EXCEPTION_EXECUTE_HANDLER;
3800 }
3801 return EXCEPTION_CONTINUE_SEARCH;
3802 }
3804 void nx_check_protection() {
3805 // If NX is enabled we'll get an exception calling into code on the stack
3806 char code[] = { (char)0xC3 }; // ret
3807 void *code_ptr = (void *)code;
3808 __try {
3809 __asm call code_ptr
3810 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3811 tty->print_raw_cr("NX protection detected.");
3812 }
3813 }
3814 #endif // _WIN64
3815 #endif // PRODUCT
3817 // this is called _before_ the global arguments have been parsed
3818 void os::init(void) {
3819 _initial_pid = _getpid();
3821 init_random(1234567);
3823 win32::initialize_system_info();
3824 win32::setmode_streams();
3825 init_page_sizes((size_t) win32::vm_page_size());
3827 // For better scalability on MP systems (must be called after initialize_system_info)
3828 #ifndef PRODUCT
3829 if (is_MP()) {
3830 NoYieldsInMicrolock = true;
3831 }
3832 #endif
3833 // This may be overridden later when argument processing is done.
3834 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3835 os::win32::is_windows_2003());
3837 // Initialize main_process and main_thread
3838 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3839 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3840 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3841 fatal("DuplicateHandle failed\n");
3842 }
3843 main_thread_id = (int) GetCurrentThreadId();
3844 }
3846 // To install functions for atexit processing
3847 extern "C" {
3848 static void perfMemory_exit_helper() {
3849 perfMemory_exit();
3850 }
3851 }
3853 static jint initSock();
3855 // this is called _after_ the global arguments have been parsed
3856 jint os::init_2(void) {
3857 // Allocate a single page and mark it as readable for safepoint polling
3858 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3859 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3861 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3862 guarantee( return_page != NULL, "Commit Failed for polling page");
3864 os::set_polling_page( polling_page );
3866 #ifndef PRODUCT
3867 if( Verbose && PrintMiscellaneous )
3868 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3869 #endif
3871 if (!UseMembar) {
3872 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3873 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3875 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3876 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3878 os::set_memory_serialize_page( mem_serialize_page );
3880 #ifndef PRODUCT
3881 if(Verbose && PrintMiscellaneous)
3882 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3883 #endif
3884 }
3886 os::large_page_init();
3888 // Setup Windows Exceptions
3890 // for debugging float code generation bugs
3891 if (ForceFloatExceptions) {
3892 #ifndef _WIN64
3893 static long fp_control_word = 0;
3894 __asm { fstcw fp_control_word }
3895 // see Intel PPro Manual, Vol. 2, p 7-16
3896 const long precision = 0x20;
3897 const long underflow = 0x10;
3898 const long overflow = 0x08;
3899 const long zero_div = 0x04;
3900 const long denorm = 0x02;
3901 const long invalid = 0x01;
3902 fp_control_word |= invalid;
3903 __asm { fldcw fp_control_word }
3904 #endif
3905 }
3907 // If stack_commit_size is 0, windows will reserve the default size,
3908 // but only commit a small portion of it.
3909 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
3910 size_t default_reserve_size = os::win32::default_stack_size();
3911 size_t actual_reserve_size = stack_commit_size;
3912 if (stack_commit_size < default_reserve_size) {
3913 // If stack_commit_size == 0, we want this too
3914 actual_reserve_size = default_reserve_size;
3915 }
3917 // Check minimum allowable stack size for thread creation and to initialize
3918 // the java system classes, including StackOverflowError - depends on page
3919 // size. Add a page for compiler2 recursion in main thread.
3920 // Add in 2*BytesPerWord times page size to account for VM stack during
3921 // class initialization depending on 32 or 64 bit VM.
3922 size_t min_stack_allowed =
3923 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
3924 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
3925 if (actual_reserve_size < min_stack_allowed) {
3926 tty->print_cr("\nThe stack size specified is too small, "
3927 "Specify at least %dk",
3928 min_stack_allowed / K);
3929 return JNI_ERR;
3930 }
3932 JavaThread::set_stack_size_at_create(stack_commit_size);
3934 // Calculate theoretical max. size of Threads to guard gainst artifical
3935 // out-of-memory situations, where all available address-space has been
3936 // reserved by thread stacks.
3937 assert(actual_reserve_size != 0, "Must have a stack");
3939 // Calculate the thread limit when we should start doing Virtual Memory
3940 // banging. Currently when the threads will have used all but 200Mb of space.
3941 //
3942 // TODO: consider performing a similar calculation for commit size instead
3943 // as reserve size, since on a 64-bit platform we'll run into that more
3944 // often than running out of virtual memory space. We can use the
3945 // lower value of the two calculations as the os_thread_limit.
3946 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
3947 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
3949 // at exit methods are called in the reverse order of their registration.
3950 // there is no limit to the number of functions registered. atexit does
3951 // not set errno.
3953 if (PerfAllowAtExitRegistration) {
3954 // only register atexit functions if PerfAllowAtExitRegistration is set.
3955 // atexit functions can be delayed until process exit time, which
3956 // can be problematic for embedded VM situations. Embedded VMs should
3957 // call DestroyJavaVM() to assure that VM resources are released.
3959 // note: perfMemory_exit_helper atexit function may be removed in
3960 // the future if the appropriate cleanup code can be added to the
3961 // VM_Exit VMOperation's doit method.
3962 if (atexit(perfMemory_exit_helper) != 0) {
3963 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3964 }
3965 }
3967 #ifndef _WIN64
3968 // Print something if NX is enabled (win32 on AMD64)
3969 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
3970 #endif
3972 // initialize thread priority policy
3973 prio_init();
3975 if (UseNUMA && !ForceNUMA) {
3976 UseNUMA = false; // We don't fully support this yet
3977 }
3979 if (UseNUMAInterleaving) {
3980 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
3981 bool success = numa_interleaving_init();
3982 if (!success) UseNUMAInterleaving = false;
3983 }
3985 if (initSock() != JNI_OK) {
3986 return JNI_ERR;
3987 }
3989 return JNI_OK;
3990 }
3992 void os::init_3(void) {
3993 return;
3994 }
3996 // Mark the polling page as unreadable
3997 void os::make_polling_page_unreadable(void) {
3998 DWORD old_status;
3999 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4000 fatal("Could not disable polling page");
4001 };
4003 // Mark the polling page as readable
4004 void os::make_polling_page_readable(void) {
4005 DWORD old_status;
4006 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4007 fatal("Could not enable polling page");
4008 };
4011 int os::stat(const char *path, struct stat *sbuf) {
4012 char pathbuf[MAX_PATH];
4013 if (strlen(path) > MAX_PATH - 1) {
4014 errno = ENAMETOOLONG;
4015 return -1;
4016 }
4017 os::native_path(strcpy(pathbuf, path));
4018 int ret = ::stat(pathbuf, sbuf);
4019 if (sbuf != NULL && UseUTCFileTimestamp) {
4020 // Fix for 6539723. st_mtime returned from stat() is dependent on
4021 // the system timezone and so can return different values for the
4022 // same file if/when daylight savings time changes. This adjustment
4023 // makes sure the same timestamp is returned regardless of the TZ.
4024 //
4025 // See:
4026 // http://msdn.microsoft.com/library/
4027 // default.asp?url=/library/en-us/sysinfo/base/
4028 // time_zone_information_str.asp
4029 // and
4030 // http://msdn.microsoft.com/library/default.asp?url=
4031 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4032 //
4033 // NOTE: there is a insidious bug here: If the timezone is changed
4034 // after the call to stat() but before 'GetTimeZoneInformation()', then
4035 // the adjustment we do here will be wrong and we'll return the wrong
4036 // value (which will likely end up creating an invalid class data
4037 // archive). Absent a better API for this, or some time zone locking
4038 // mechanism, we'll have to live with this risk.
4039 TIME_ZONE_INFORMATION tz;
4040 DWORD tzid = GetTimeZoneInformation(&tz);
4041 int daylightBias =
4042 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4043 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4044 }
4045 return ret;
4046 }
4049 #define FT2INT64(ft) \
4050 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4053 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4054 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4055 // of a thread.
4056 //
4057 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4058 // the fast estimate available on the platform.
4060 // current_thread_cpu_time() is not optimized for Windows yet
4061 jlong os::current_thread_cpu_time() {
4062 // return user + sys since the cost is the same
4063 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4064 }
4066 jlong os::thread_cpu_time(Thread* thread) {
4067 // consistent with what current_thread_cpu_time() returns.
4068 return os::thread_cpu_time(thread, true /* user+sys */);
4069 }
4071 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4072 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4073 }
4075 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4076 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4077 // If this function changes, os::is_thread_cpu_time_supported() should too
4078 if (os::win32::is_nt()) {
4079 FILETIME CreationTime;
4080 FILETIME ExitTime;
4081 FILETIME KernelTime;
4082 FILETIME UserTime;
4084 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4085 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4086 return -1;
4087 else
4088 if (user_sys_cpu_time) {
4089 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4090 } else {
4091 return FT2INT64(UserTime) * 100;
4092 }
4093 } else {
4094 return (jlong) timeGetTime() * 1000000;
4095 }
4096 }
4098 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4099 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4100 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4101 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4102 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4103 }
4105 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4106 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4107 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4108 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4109 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4110 }
4112 bool os::is_thread_cpu_time_supported() {
4113 // see os::thread_cpu_time
4114 if (os::win32::is_nt()) {
4115 FILETIME CreationTime;
4116 FILETIME ExitTime;
4117 FILETIME KernelTime;
4118 FILETIME UserTime;
4120 if ( GetThreadTimes(GetCurrentThread(),
4121 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4122 return false;
4123 else
4124 return true;
4125 } else {
4126 return false;
4127 }
4128 }
4130 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4131 // It does have primitives (PDH API) to get CPU usage and run queue length.
4132 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4133 // If we wanted to implement loadavg on Windows, we have a few options:
4134 //
4135 // a) Query CPU usage and run queue length and "fake" an answer by
4136 // returning the CPU usage if it's under 100%, and the run queue
4137 // length otherwise. It turns out that querying is pretty slow
4138 // on Windows, on the order of 200 microseconds on a fast machine.
4139 // Note that on the Windows the CPU usage value is the % usage
4140 // since the last time the API was called (and the first call
4141 // returns 100%), so we'd have to deal with that as well.
4142 //
4143 // b) Sample the "fake" answer using a sampling thread and store
4144 // the answer in a global variable. The call to loadavg would
4145 // just return the value of the global, avoiding the slow query.
4146 //
4147 // c) Sample a better answer using exponential decay to smooth the
4148 // value. This is basically the algorithm used by UNIX kernels.
4149 //
4150 // Note that sampling thread starvation could affect both (b) and (c).
4151 int os::loadavg(double loadavg[], int nelem) {
4152 return -1;
4153 }
4156 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4157 bool os::dont_yield() {
4158 return DontYieldALot;
4159 }
4161 // This method is a slightly reworked copy of JDK's sysOpen
4162 // from src/windows/hpi/src/sys_api_md.c
4164 int os::open(const char *path, int oflag, int mode) {
4165 char pathbuf[MAX_PATH];
4167 if (strlen(path) > MAX_PATH - 1) {
4168 errno = ENAMETOOLONG;
4169 return -1;
4170 }
4171 os::native_path(strcpy(pathbuf, path));
4172 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4173 }
4175 FILE* os::open(int fd, const char* mode) {
4176 return ::_fdopen(fd, mode);
4177 }
4179 // Is a (classpath) directory empty?
4180 bool os::dir_is_empty(const char* path) {
4181 WIN32_FIND_DATA fd;
4182 HANDLE f = FindFirstFile(path, &fd);
4183 if (f == INVALID_HANDLE_VALUE) {
4184 return true;
4185 }
4186 FindClose(f);
4187 return false;
4188 }
4190 // create binary file, rewriting existing file if required
4191 int os::create_binary_file(const char* path, bool rewrite_existing) {
4192 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4193 if (!rewrite_existing) {
4194 oflags |= _O_EXCL;
4195 }
4196 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4197 }
4199 // return current position of file pointer
4200 jlong os::current_file_offset(int fd) {
4201 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4202 }
4204 // move file pointer to the specified offset
4205 jlong os::seek_to_file_offset(int fd, jlong offset) {
4206 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4207 }
4210 jlong os::lseek(int fd, jlong offset, int whence) {
4211 return (jlong) ::_lseeki64(fd, offset, whence);
4212 }
4214 // This method is a slightly reworked copy of JDK's sysNativePath
4215 // from src/windows/hpi/src/path_md.c
4217 /* Convert a pathname to native format. On win32, this involves forcing all
4218 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4219 sometimes rejects '/') and removing redundant separators. The input path is
4220 assumed to have been converted into the character encoding used by the local
4221 system. Because this might be a double-byte encoding, care is taken to
4222 treat double-byte lead characters correctly.
4224 This procedure modifies the given path in place, as the result is never
4225 longer than the original. There is no error return; this operation always
4226 succeeds. */
4227 char * os::native_path(char *path) {
4228 char *src = path, *dst = path, *end = path;
4229 char *colon = NULL; /* If a drive specifier is found, this will
4230 point to the colon following the drive
4231 letter */
4233 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4234 assert(((!::IsDBCSLeadByte('/'))
4235 && (!::IsDBCSLeadByte('\\'))
4236 && (!::IsDBCSLeadByte(':'))),
4237 "Illegal lead byte");
4239 /* Check for leading separators */
4240 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4241 while (isfilesep(*src)) {
4242 src++;
4243 }
4245 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4246 /* Remove leading separators if followed by drive specifier. This
4247 hack is necessary to support file URLs containing drive
4248 specifiers (e.g., "file://c:/path"). As a side effect,
4249 "/c:/path" can be used as an alternative to "c:/path". */
4250 *dst++ = *src++;
4251 colon = dst;
4252 *dst++ = ':';
4253 src++;
4254 } else {
4255 src = path;
4256 if (isfilesep(src[0]) && isfilesep(src[1])) {
4257 /* UNC pathname: Retain first separator; leave src pointed at
4258 second separator so that further separators will be collapsed
4259 into the second separator. The result will be a pathname
4260 beginning with "\\\\" followed (most likely) by a host name. */
4261 src = dst = path + 1;
4262 path[0] = '\\'; /* Force first separator to '\\' */
4263 }
4264 }
4266 end = dst;
4268 /* Remove redundant separators from remainder of path, forcing all
4269 separators to be '\\' rather than '/'. Also, single byte space
4270 characters are removed from the end of the path because those
4271 are not legal ending characters on this operating system.
4272 */
4273 while (*src != '\0') {
4274 if (isfilesep(*src)) {
4275 *dst++ = '\\'; src++;
4276 while (isfilesep(*src)) src++;
4277 if (*src == '\0') {
4278 /* Check for trailing separator */
4279 end = dst;
4280 if (colon == dst - 2) break; /* "z:\\" */
4281 if (dst == path + 1) break; /* "\\" */
4282 if (dst == path + 2 && isfilesep(path[0])) {
4283 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4284 beginning of a UNC pathname. Even though it is not, by
4285 itself, a valid UNC pathname, we leave it as is in order
4286 to be consistent with the path canonicalizer as well
4287 as the win32 APIs, which treat this case as an invalid
4288 UNC pathname rather than as an alias for the root
4289 directory of the current drive. */
4290 break;
4291 }
4292 end = --dst; /* Path does not denote a root directory, so
4293 remove trailing separator */
4294 break;
4295 }
4296 end = dst;
4297 } else {
4298 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4299 *dst++ = *src++;
4300 if (*src) *dst++ = *src++;
4301 end = dst;
4302 } else { /* Copy a single-byte character */
4303 char c = *src++;
4304 *dst++ = c;
4305 /* Space is not a legal ending character */
4306 if (c != ' ') end = dst;
4307 }
4308 }
4309 }
4311 *end = '\0';
4313 /* For "z:", add "." to work around a bug in the C runtime library */
4314 if (colon == dst - 1) {
4315 path[2] = '.';
4316 path[3] = '\0';
4317 }
4319 return path;
4320 }
4322 // This code is a copy of JDK's sysSetLength
4323 // from src/windows/hpi/src/sys_api_md.c
4325 int os::ftruncate(int fd, jlong length) {
4326 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4327 long high = (long)(length >> 32);
4328 DWORD ret;
4330 if (h == (HANDLE)(-1)) {
4331 return -1;
4332 }
4334 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4335 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4336 return -1;
4337 }
4339 if (::SetEndOfFile(h) == FALSE) {
4340 return -1;
4341 }
4343 return 0;
4344 }
4347 // This code is a copy of JDK's sysSync
4348 // from src/windows/hpi/src/sys_api_md.c
4349 // except for the legacy workaround for a bug in Win 98
4351 int os::fsync(int fd) {
4352 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4354 if ( (!::FlushFileBuffers(handle)) &&
4355 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4356 /* from winerror.h */
4357 return -1;
4358 }
4359 return 0;
4360 }
4362 static int nonSeekAvailable(int, long *);
4363 static int stdinAvailable(int, long *);
4365 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4366 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4368 // This code is a copy of JDK's sysAvailable
4369 // from src/windows/hpi/src/sys_api_md.c
4371 int os::available(int fd, jlong *bytes) {
4372 jlong cur, end;
4373 struct _stati64 stbuf64;
4375 if (::_fstati64(fd, &stbuf64) >= 0) {
4376 int mode = stbuf64.st_mode;
4377 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4378 int ret;
4379 long lpbytes;
4380 if (fd == 0) {
4381 ret = stdinAvailable(fd, &lpbytes);
4382 } else {
4383 ret = nonSeekAvailable(fd, &lpbytes);
4384 }
4385 (*bytes) = (jlong)(lpbytes);
4386 return ret;
4387 }
4388 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4389 return FALSE;
4390 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4391 return FALSE;
4392 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4393 return FALSE;
4394 }
4395 *bytes = end - cur;
4396 return TRUE;
4397 } else {
4398 return FALSE;
4399 }
4400 }
4402 // This code is a copy of JDK's nonSeekAvailable
4403 // from src/windows/hpi/src/sys_api_md.c
4405 static int nonSeekAvailable(int fd, long *pbytes) {
4406 /* This is used for available on non-seekable devices
4407 * (like both named and anonymous pipes, such as pipes
4408 * connected to an exec'd process).
4409 * Standard Input is a special case.
4410 *
4411 */
4412 HANDLE han;
4414 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4415 return FALSE;
4416 }
4418 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4419 /* PeekNamedPipe fails when at EOF. In that case we
4420 * simply make *pbytes = 0 which is consistent with the
4421 * behavior we get on Solaris when an fd is at EOF.
4422 * The only alternative is to raise an Exception,
4423 * which isn't really warranted.
4424 */
4425 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4426 return FALSE;
4427 }
4428 *pbytes = 0;
4429 }
4430 return TRUE;
4431 }
4433 #define MAX_INPUT_EVENTS 2000
4435 // This code is a copy of JDK's stdinAvailable
4436 // from src/windows/hpi/src/sys_api_md.c
4438 static int stdinAvailable(int fd, long *pbytes) {
4439 HANDLE han;
4440 DWORD numEventsRead = 0; /* Number of events read from buffer */
4441 DWORD numEvents = 0; /* Number of events in buffer */
4442 DWORD i = 0; /* Loop index */
4443 DWORD curLength = 0; /* Position marker */
4444 DWORD actualLength = 0; /* Number of bytes readable */
4445 BOOL error = FALSE; /* Error holder */
4446 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4448 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4449 return FALSE;
4450 }
4452 /* Construct an array of input records in the console buffer */
4453 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4454 if (error == 0) {
4455 return nonSeekAvailable(fd, pbytes);
4456 }
4458 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4459 if (numEvents > MAX_INPUT_EVENTS) {
4460 numEvents = MAX_INPUT_EVENTS;
4461 }
4463 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4464 if (lpBuffer == NULL) {
4465 return FALSE;
4466 }
4468 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4469 if (error == 0) {
4470 os::free(lpBuffer, mtInternal);
4471 return FALSE;
4472 }
4474 /* Examine input records for the number of bytes available */
4475 for(i=0; i<numEvents; i++) {
4476 if (lpBuffer[i].EventType == KEY_EVENT) {
4478 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4479 &(lpBuffer[i].Event);
4480 if (keyRecord->bKeyDown == TRUE) {
4481 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4482 curLength++;
4483 if (*keyPressed == '\r') {
4484 actualLength = curLength;
4485 }
4486 }
4487 }
4488 }
4490 if(lpBuffer != NULL) {
4491 os::free(lpBuffer, mtInternal);
4492 }
4494 *pbytes = (long) actualLength;
4495 return TRUE;
4496 }
4498 // Map a block of memory.
4499 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4500 char *addr, size_t bytes, bool read_only,
4501 bool allow_exec) {
4502 HANDLE hFile;
4503 char* base;
4505 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4506 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4507 if (hFile == NULL) {
4508 if (PrintMiscellaneous && Verbose) {
4509 DWORD err = GetLastError();
4510 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4511 }
4512 return NULL;
4513 }
4515 if (allow_exec) {
4516 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4517 // unless it comes from a PE image (which the shared archive is not.)
4518 // Even VirtualProtect refuses to give execute access to mapped memory
4519 // that was not previously executable.
4520 //
4521 // Instead, stick the executable region in anonymous memory. Yuck.
4522 // Penalty is that ~4 pages will not be shareable - in the future
4523 // we might consider DLLizing the shared archive with a proper PE
4524 // header so that mapping executable + sharing is possible.
4526 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4527 PAGE_READWRITE);
4528 if (base == NULL) {
4529 if (PrintMiscellaneous && Verbose) {
4530 DWORD err = GetLastError();
4531 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4532 }
4533 CloseHandle(hFile);
4534 return NULL;
4535 }
4537 DWORD bytes_read;
4538 OVERLAPPED overlapped;
4539 overlapped.Offset = (DWORD)file_offset;
4540 overlapped.OffsetHigh = 0;
4541 overlapped.hEvent = NULL;
4542 // ReadFile guarantees that if the return value is true, the requested
4543 // number of bytes were read before returning.
4544 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4545 if (!res) {
4546 if (PrintMiscellaneous && Verbose) {
4547 DWORD err = GetLastError();
4548 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4549 }
4550 release_memory(base, bytes);
4551 CloseHandle(hFile);
4552 return NULL;
4553 }
4554 } else {
4555 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4556 NULL /*file_name*/);
4557 if (hMap == NULL) {
4558 if (PrintMiscellaneous && Verbose) {
4559 DWORD err = GetLastError();
4560 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4561 }
4562 CloseHandle(hFile);
4563 return NULL;
4564 }
4566 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4567 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4568 (DWORD)bytes, addr);
4569 if (base == NULL) {
4570 if (PrintMiscellaneous && Verbose) {
4571 DWORD err = GetLastError();
4572 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4573 }
4574 CloseHandle(hMap);
4575 CloseHandle(hFile);
4576 return NULL;
4577 }
4579 if (CloseHandle(hMap) == 0) {
4580 if (PrintMiscellaneous && Verbose) {
4581 DWORD err = GetLastError();
4582 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4583 }
4584 CloseHandle(hFile);
4585 return base;
4586 }
4587 }
4589 if (allow_exec) {
4590 DWORD old_protect;
4591 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4592 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4594 if (!res) {
4595 if (PrintMiscellaneous && Verbose) {
4596 DWORD err = GetLastError();
4597 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4598 }
4599 // Don't consider this a hard error, on IA32 even if the
4600 // VirtualProtect fails, we should still be able to execute
4601 CloseHandle(hFile);
4602 return base;
4603 }
4604 }
4606 if (CloseHandle(hFile) == 0) {
4607 if (PrintMiscellaneous && Verbose) {
4608 DWORD err = GetLastError();
4609 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4610 }
4611 return base;
4612 }
4614 return base;
4615 }
4618 // Remap a block of memory.
4619 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4620 char *addr, size_t bytes, bool read_only,
4621 bool allow_exec) {
4622 // This OS does not allow existing memory maps to be remapped so we
4623 // have to unmap the memory before we remap it.
4624 if (!os::unmap_memory(addr, bytes)) {
4625 return NULL;
4626 }
4628 // There is a very small theoretical window between the unmap_memory()
4629 // call above and the map_memory() call below where a thread in native
4630 // code may be able to access an address that is no longer mapped.
4632 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4633 read_only, allow_exec);
4634 }
4637 // Unmap a block of memory.
4638 // Returns true=success, otherwise false.
4640 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4641 BOOL result = UnmapViewOfFile(addr);
4642 if (result == 0) {
4643 if (PrintMiscellaneous && Verbose) {
4644 DWORD err = GetLastError();
4645 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4646 }
4647 return false;
4648 }
4649 return true;
4650 }
4652 void os::pause() {
4653 char filename[MAX_PATH];
4654 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4655 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4656 } else {
4657 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4658 }
4660 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4661 if (fd != -1) {
4662 struct stat buf;
4663 ::close(fd);
4664 while (::stat(filename, &buf) == 0) {
4665 Sleep(100);
4666 }
4667 } else {
4668 jio_fprintf(stderr,
4669 "Could not open pause file '%s', continuing immediately.\n", filename);
4670 }
4671 }
4673 // An Event wraps a win32 "CreateEvent" kernel handle.
4674 //
4675 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4676 //
4677 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4678 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4679 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4680 // In addition, an unpark() operation might fetch the handle field, but the
4681 // event could recycle between the fetch and the SetEvent() operation.
4682 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4683 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4684 // on an stale but recycled handle would be harmless, but in practice this might
4685 // confuse other non-Sun code, so it's not a viable approach.
4686 //
4687 // 2: Once a win32 event handle is associated with an Event, it remains associated
4688 // with the Event. The event handle is never closed. This could be construed
4689 // as handle leakage, but only up to the maximum # of threads that have been extant
4690 // at any one time. This shouldn't be an issue, as windows platforms typically
4691 // permit a process to have hundreds of thousands of open handles.
4692 //
4693 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4694 // and release unused handles.
4695 //
4696 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4697 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4698 //
4699 // 5. Use an RCU-like mechanism (Read-Copy Update).
4700 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4701 //
4702 // We use (2).
4703 //
4704 // TODO-FIXME:
4705 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4706 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4707 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4708 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4709 // into a single win32 CreateEvent() handle.
4710 //
4711 // _Event transitions in park()
4712 // -1 => -1 : illegal
4713 // 1 => 0 : pass - return immediately
4714 // 0 => -1 : block
4715 //
4716 // _Event serves as a restricted-range semaphore :
4717 // -1 : thread is blocked
4718 // 0 : neutral - thread is running or ready
4719 // 1 : signaled - thread is running or ready
4720 //
4721 // Another possible encoding of _Event would be
4722 // with explicit "PARKED" and "SIGNALED" bits.
4724 int os::PlatformEvent::park (jlong Millis) {
4725 guarantee (_ParkHandle != NULL , "Invariant") ;
4726 guarantee (Millis > 0 , "Invariant") ;
4727 int v ;
4729 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4730 // the initial park() operation.
4732 for (;;) {
4733 v = _Event ;
4734 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4735 }
4736 guarantee ((v == 0) || (v == 1), "invariant") ;
4737 if (v != 0) return OS_OK ;
4739 // Do this the hard way by blocking ...
4740 // TODO: consider a brief spin here, gated on the success of recent
4741 // spin attempts by this thread.
4742 //
4743 // We decompose long timeouts into series of shorter timed waits.
4744 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4745 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4746 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4747 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4748 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4749 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4750 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4751 // for the already waited time. This policy does not admit any new outcomes.
4752 // In the future, however, we might want to track the accumulated wait time and
4753 // adjust Millis accordingly if we encounter a spurious wakeup.
4755 const int MAXTIMEOUT = 0x10000000 ;
4756 DWORD rv = WAIT_TIMEOUT ;
4757 while (_Event < 0 && Millis > 0) {
4758 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4759 if (Millis > MAXTIMEOUT) {
4760 prd = MAXTIMEOUT ;
4761 }
4762 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4763 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4764 if (rv == WAIT_TIMEOUT) {
4765 Millis -= prd ;
4766 }
4767 }
4768 v = _Event ;
4769 _Event = 0 ;
4770 // see comment at end of os::PlatformEvent::park() below:
4771 OrderAccess::fence() ;
4772 // If we encounter a nearly simultanous timeout expiry and unpark()
4773 // we return OS_OK indicating we awoke via unpark().
4774 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4775 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4776 }
4778 void os::PlatformEvent::park () {
4779 guarantee (_ParkHandle != NULL, "Invariant") ;
4780 // Invariant: Only the thread associated with the Event/PlatformEvent
4781 // may call park().
4782 int v ;
4783 for (;;) {
4784 v = _Event ;
4785 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4786 }
4787 guarantee ((v == 0) || (v == 1), "invariant") ;
4788 if (v != 0) return ;
4790 // Do this the hard way by blocking ...
4791 // TODO: consider a brief spin here, gated on the success of recent
4792 // spin attempts by this thread.
4793 while (_Event < 0) {
4794 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4795 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4796 }
4798 // Usually we'll find _Event == 0 at this point, but as
4799 // an optional optimization we clear it, just in case can
4800 // multiple unpark() operations drove _Event up to 1.
4801 _Event = 0 ;
4802 OrderAccess::fence() ;
4803 guarantee (_Event >= 0, "invariant") ;
4804 }
4806 void os::PlatformEvent::unpark() {
4807 guarantee (_ParkHandle != NULL, "Invariant") ;
4809 // Transitions for _Event:
4810 // 0 :=> 1
4811 // 1 :=> 1
4812 // -1 :=> either 0 or 1; must signal target thread
4813 // That is, we can safely transition _Event from -1 to either
4814 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4815 // unpark() calls.
4816 // See also: "Semaphores in Plan 9" by Mullender & Cox
4817 //
4818 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4819 // that it will take two back-to-back park() calls for the owning
4820 // thread to block. This has the benefit of forcing a spurious return
4821 // from the first park() call after an unpark() call which will help
4822 // shake out uses of park() and unpark() without condition variables.
4824 if (Atomic::xchg(1, &_Event) >= 0) return;
4826 ::SetEvent(_ParkHandle);
4827 }
4830 // JSR166
4831 // -------------------------------------------------------
4833 /*
4834 * The Windows implementation of Park is very straightforward: Basic
4835 * operations on Win32 Events turn out to have the right semantics to
4836 * use them directly. We opportunistically resuse the event inherited
4837 * from Monitor.
4838 */
4841 void Parker::park(bool isAbsolute, jlong time) {
4842 guarantee (_ParkEvent != NULL, "invariant") ;
4843 // First, demultiplex/decode time arguments
4844 if (time < 0) { // don't wait
4845 return;
4846 }
4847 else if (time == 0 && !isAbsolute) {
4848 time = INFINITE;
4849 }
4850 else if (isAbsolute) {
4851 time -= os::javaTimeMillis(); // convert to relative time
4852 if (time <= 0) // already elapsed
4853 return;
4854 }
4855 else { // relative
4856 time /= 1000000; // Must coarsen from nanos to millis
4857 if (time == 0) // Wait for the minimal time unit if zero
4858 time = 1;
4859 }
4861 JavaThread* thread = (JavaThread*)(Thread::current());
4862 assert(thread->is_Java_thread(), "Must be JavaThread");
4863 JavaThread *jt = (JavaThread *)thread;
4865 // Don't wait if interrupted or already triggered
4866 if (Thread::is_interrupted(thread, false) ||
4867 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4868 ResetEvent(_ParkEvent);
4869 return;
4870 }
4871 else {
4872 ThreadBlockInVM tbivm(jt);
4873 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4874 jt->set_suspend_equivalent();
4876 WaitForSingleObject(_ParkEvent, time);
4877 ResetEvent(_ParkEvent);
4879 // If externally suspended while waiting, re-suspend
4880 if (jt->handle_special_suspend_equivalent_condition()) {
4881 jt->java_suspend_self();
4882 }
4883 }
4884 }
4886 void Parker::unpark() {
4887 guarantee (_ParkEvent != NULL, "invariant") ;
4888 SetEvent(_ParkEvent);
4889 }
4891 // Run the specified command in a separate process. Return its exit value,
4892 // or -1 on failure (e.g. can't create a new process).
4893 int os::fork_and_exec(char* cmd) {
4894 STARTUPINFO si;
4895 PROCESS_INFORMATION pi;
4897 memset(&si, 0, sizeof(si));
4898 si.cb = sizeof(si);
4899 memset(&pi, 0, sizeof(pi));
4900 BOOL rslt = CreateProcess(NULL, // executable name - use command line
4901 cmd, // command line
4902 NULL, // process security attribute
4903 NULL, // thread security attribute
4904 TRUE, // inherits system handles
4905 0, // no creation flags
4906 NULL, // use parent's environment block
4907 NULL, // use parent's starting directory
4908 &si, // (in) startup information
4909 &pi); // (out) process information
4911 if (rslt) {
4912 // Wait until child process exits.
4913 WaitForSingleObject(pi.hProcess, INFINITE);
4915 DWORD exit_code;
4916 GetExitCodeProcess(pi.hProcess, &exit_code);
4918 // Close process and thread handles.
4919 CloseHandle(pi.hProcess);
4920 CloseHandle(pi.hThread);
4922 return (int)exit_code;
4923 } else {
4924 return -1;
4925 }
4926 }
4928 //--------------------------------------------------------------------------------------------------
4929 // Non-product code
4931 static int mallocDebugIntervalCounter = 0;
4932 static int mallocDebugCounter = 0;
4933 bool os::check_heap(bool force) {
4934 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
4935 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
4936 // Note: HeapValidate executes two hardware breakpoints when it finds something
4937 // wrong; at these points, eax contains the address of the offending block (I think).
4938 // To get to the exlicit error message(s) below, just continue twice.
4939 HANDLE heap = GetProcessHeap();
4940 { HeapLock(heap);
4941 PROCESS_HEAP_ENTRY phe;
4942 phe.lpData = NULL;
4943 while (HeapWalk(heap, &phe) != 0) {
4944 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
4945 !HeapValidate(heap, 0, phe.lpData)) {
4946 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
4947 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
4948 fatal("corrupted C heap");
4949 }
4950 }
4951 DWORD err = GetLastError();
4952 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
4953 fatal(err_msg("heap walk aborted with error %d", err));
4954 }
4955 HeapUnlock(heap);
4956 }
4957 mallocDebugIntervalCounter = 0;
4958 }
4959 return true;
4960 }
4963 bool os::find(address addr, outputStream* st) {
4964 // Nothing yet
4965 return false;
4966 }
4968 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
4969 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
4971 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
4972 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
4973 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
4974 address addr = (address) exceptionRecord->ExceptionInformation[1];
4976 if (os::is_memory_serialize_page(thread, addr))
4977 return EXCEPTION_CONTINUE_EXECUTION;
4978 }
4980 return EXCEPTION_CONTINUE_SEARCH;
4981 }
4983 // We don't build a headless jre for Windows
4984 bool os::is_headless_jre() { return false; }
4986 static jint initSock() {
4987 WSADATA wsadata;
4989 if (!os::WinSock2Dll::WinSock2Available()) {
4990 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
4991 ::GetLastError());
4992 return JNI_ERR;
4993 }
4995 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
4996 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
4997 ::GetLastError());
4998 return JNI_ERR;
4999 }
5000 return JNI_OK;
5001 }
5003 struct hostent* os::get_host_by_name(char* name) {
5004 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5005 }
5007 int os::socket_close(int fd) {
5008 return ::closesocket(fd);
5009 }
5011 int os::socket_available(int fd, jint *pbytes) {
5012 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5013 return (ret < 0) ? 0 : 1;
5014 }
5016 int os::socket(int domain, int type, int protocol) {
5017 return ::socket(domain, type, protocol);
5018 }
5020 int os::listen(int fd, int count) {
5021 return ::listen(fd, count);
5022 }
5024 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5025 return ::connect(fd, him, len);
5026 }
5028 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5029 return ::accept(fd, him, len);
5030 }
5032 int os::sendto(int fd, char* buf, size_t len, uint flags,
5033 struct sockaddr* to, socklen_t tolen) {
5035 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5036 }
5038 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5039 sockaddr* from, socklen_t* fromlen) {
5041 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5042 }
5044 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5045 return ::recv(fd, buf, (int)nBytes, flags);
5046 }
5048 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5049 return ::send(fd, buf, (int)nBytes, flags);
5050 }
5052 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5053 return ::send(fd, buf, (int)nBytes, flags);
5054 }
5056 int os::timeout(int fd, long timeout) {
5057 fd_set tbl;
5058 struct timeval t;
5060 t.tv_sec = timeout / 1000;
5061 t.tv_usec = (timeout % 1000) * 1000;
5063 tbl.fd_count = 1;
5064 tbl.fd_array[0] = fd;
5066 return ::select(1, &tbl, 0, 0, &t);
5067 }
5069 int os::get_host_name(char* name, int namelen) {
5070 return ::gethostname(name, namelen);
5071 }
5073 int os::socket_shutdown(int fd, int howto) {
5074 return ::shutdown(fd, howto);
5075 }
5077 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5078 return ::bind(fd, him, len);
5079 }
5081 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5082 return ::getsockname(fd, him, len);
5083 }
5085 int os::get_sock_opt(int fd, int level, int optname,
5086 char* optval, socklen_t* optlen) {
5087 return ::getsockopt(fd, level, optname, optval, optlen);
5088 }
5090 int os::set_sock_opt(int fd, int level, int optname,
5091 const char* optval, socklen_t optlen) {
5092 return ::setsockopt(fd, level, optname, optval, optlen);
5093 }
5095 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5096 #if defined(IA32)
5097 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5098 #elif defined (AMD64)
5099 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5100 #endif
5102 // returns true if thread could be suspended,
5103 // false otherwise
5104 static bool do_suspend(HANDLE* h) {
5105 if (h != NULL) {
5106 if (SuspendThread(*h) != ~0) {
5107 return true;
5108 }
5109 }
5110 return false;
5111 }
5113 // resume the thread
5114 // calling resume on an active thread is a no-op
5115 static void do_resume(HANDLE* h) {
5116 if (h != NULL) {
5117 ResumeThread(*h);
5118 }
5119 }
5121 // retrieve a suspend/resume context capable handle
5122 // from the tid. Caller validates handle return value.
5123 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5124 if (h != NULL) {
5125 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5126 }
5127 }
5129 //
5130 // Thread sampling implementation
5131 //
5132 void os::SuspendedThreadTask::internal_do_task() {
5133 CONTEXT ctxt;
5134 HANDLE h = NULL;
5136 // get context capable handle for thread
5137 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5139 // sanity
5140 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5141 return;
5142 }
5144 // suspend the thread
5145 if (do_suspend(&h)) {
5146 ctxt.ContextFlags = sampling_context_flags;
5147 // get thread context
5148 GetThreadContext(h, &ctxt);
5149 SuspendedThreadTaskContext context(_thread, &ctxt);
5150 // pass context to Thread Sampling impl
5151 do_task(context);
5152 // resume thread
5153 do_resume(&h);
5154 }
5156 // close handle
5157 CloseHandle(h);
5158 }
5161 // Kernel32 API
5162 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5163 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5164 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5165 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5166 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5168 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5169 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5170 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5171 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5172 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5175 BOOL os::Kernel32Dll::initialized = FALSE;
5176 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5177 assert(initialized && _GetLargePageMinimum != NULL,
5178 "GetLargePageMinimumAvailable() not yet called");
5179 return _GetLargePageMinimum();
5180 }
5182 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5183 if (!initialized) {
5184 initialize();
5185 }
5186 return _GetLargePageMinimum != NULL;
5187 }
5189 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5190 if (!initialized) {
5191 initialize();
5192 }
5193 return _VirtualAllocExNuma != NULL;
5194 }
5196 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5197 assert(initialized && _VirtualAllocExNuma != NULL,
5198 "NUMACallsAvailable() not yet called");
5200 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5201 }
5203 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5204 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5205 "NUMACallsAvailable() not yet called");
5207 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5208 }
5210 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5211 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5212 "NUMACallsAvailable() not yet called");
5214 return _GetNumaNodeProcessorMask(node, proc_mask);
5215 }
5217 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5218 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5219 if (!initialized) {
5220 initialize();
5221 }
5223 if (_RtlCaptureStackBackTrace != NULL) {
5224 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5225 BackTrace, BackTraceHash);
5226 } else {
5227 return 0;
5228 }
5229 }
5231 void os::Kernel32Dll::initializeCommon() {
5232 if (!initialized) {
5233 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5234 assert(handle != NULL, "Just check");
5235 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5236 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5237 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5238 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5239 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5240 initialized = TRUE;
5241 }
5242 }
5246 #ifndef JDK6_OR_EARLIER
5248 void os::Kernel32Dll::initialize() {
5249 initializeCommon();
5250 }
5253 // Kernel32 API
5254 inline BOOL os::Kernel32Dll::SwitchToThread() {
5255 return ::SwitchToThread();
5256 }
5258 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5259 return true;
5260 }
5262 // Help tools
5263 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5264 return true;
5265 }
5267 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5268 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5269 }
5271 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5272 return ::Module32First(hSnapshot, lpme);
5273 }
5275 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5276 return ::Module32Next(hSnapshot, lpme);
5277 }
5280 inline BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5281 return true;
5282 }
5284 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5285 ::GetNativeSystemInfo(lpSystemInfo);
5286 }
5288 // PSAPI API
5289 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5290 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5291 }
5293 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5294 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5295 }
5297 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5298 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5299 }
5301 inline BOOL os::PSApiDll::PSApiAvailable() {
5302 return true;
5303 }
5306 // WinSock2 API
5307 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5308 return ::WSAStartup(wVersionRequested, lpWSAData);
5309 }
5311 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5312 return ::gethostbyname(name);
5313 }
5315 inline BOOL os::WinSock2Dll::WinSock2Available() {
5316 return true;
5317 }
5319 // Advapi API
5320 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5321 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5322 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5323 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5324 BufferLength, PreviousState, ReturnLength);
5325 }
5327 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5328 PHANDLE TokenHandle) {
5329 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5330 }
5332 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5333 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5334 }
5336 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5337 return true;
5338 }
5340 #else
5341 // Kernel32 API
5342 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5343 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5344 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5345 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5346 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5348 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5349 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5350 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5351 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5352 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5354 void os::Kernel32Dll::initialize() {
5355 if (!initialized) {
5356 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5357 assert(handle != NULL, "Just check");
5359 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5360 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5361 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5362 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5363 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5364 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5365 initializeCommon(); // resolve the functions that always need resolving
5367 initialized = TRUE;
5368 }
5369 }
5371 BOOL os::Kernel32Dll::SwitchToThread() {
5372 assert(initialized && _SwitchToThread != NULL,
5373 "SwitchToThreadAvailable() not yet called");
5374 return _SwitchToThread();
5375 }
5378 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5379 if (!initialized) {
5380 initialize();
5381 }
5382 return _SwitchToThread != NULL;
5383 }
5385 // Help tools
5386 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5387 if (!initialized) {
5388 initialize();
5389 }
5390 return _CreateToolhelp32Snapshot != NULL &&
5391 _Module32First != NULL &&
5392 _Module32Next != NULL;
5393 }
5395 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5396 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5397 "HelpToolsAvailable() not yet called");
5399 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5400 }
5402 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5403 assert(initialized && _Module32First != NULL,
5404 "HelpToolsAvailable() not yet called");
5406 return _Module32First(hSnapshot, lpme);
5407 }
5409 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5410 assert(initialized && _Module32Next != NULL,
5411 "HelpToolsAvailable() not yet called");
5413 return _Module32Next(hSnapshot, lpme);
5414 }
5417 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5418 if (!initialized) {
5419 initialize();
5420 }
5421 return _GetNativeSystemInfo != NULL;
5422 }
5424 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5425 assert(initialized && _GetNativeSystemInfo != NULL,
5426 "GetNativeSystemInfoAvailable() not yet called");
5428 _GetNativeSystemInfo(lpSystemInfo);
5429 }
5431 // PSAPI API
5434 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5435 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5436 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5438 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5439 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5440 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5441 BOOL os::PSApiDll::initialized = FALSE;
5443 void os::PSApiDll::initialize() {
5444 if (!initialized) {
5445 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5446 if (handle != NULL) {
5447 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5448 "EnumProcessModules");
5449 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5450 "GetModuleFileNameExA");
5451 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5452 "GetModuleInformation");
5453 }
5454 initialized = TRUE;
5455 }
5456 }
5460 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5461 assert(initialized && _EnumProcessModules != NULL,
5462 "PSApiAvailable() not yet called");
5463 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5464 }
5466 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5467 assert(initialized && _GetModuleFileNameEx != NULL,
5468 "PSApiAvailable() not yet called");
5469 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5470 }
5472 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5473 assert(initialized && _GetModuleInformation != NULL,
5474 "PSApiAvailable() not yet called");
5475 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5476 }
5478 BOOL os::PSApiDll::PSApiAvailable() {
5479 if (!initialized) {
5480 initialize();
5481 }
5482 return _EnumProcessModules != NULL &&
5483 _GetModuleFileNameEx != NULL &&
5484 _GetModuleInformation != NULL;
5485 }
5488 // WinSock2 API
5489 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5490 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5492 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5493 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5494 BOOL os::WinSock2Dll::initialized = FALSE;
5496 void os::WinSock2Dll::initialize() {
5497 if (!initialized) {
5498 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5499 if (handle != NULL) {
5500 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5501 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5502 }
5503 initialized = TRUE;
5504 }
5505 }
5508 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5509 assert(initialized && _WSAStartup != NULL,
5510 "WinSock2Available() not yet called");
5511 return _WSAStartup(wVersionRequested, lpWSAData);
5512 }
5514 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5515 assert(initialized && _gethostbyname != NULL,
5516 "WinSock2Available() not yet called");
5517 return _gethostbyname(name);
5518 }
5520 BOOL os::WinSock2Dll::WinSock2Available() {
5521 if (!initialized) {
5522 initialize();
5523 }
5524 return _WSAStartup != NULL &&
5525 _gethostbyname != NULL;
5526 }
5528 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5529 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5530 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5532 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5533 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5534 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5535 BOOL os::Advapi32Dll::initialized = FALSE;
5537 void os::Advapi32Dll::initialize() {
5538 if (!initialized) {
5539 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5540 if (handle != NULL) {
5541 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5542 "AdjustTokenPrivileges");
5543 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5544 "OpenProcessToken");
5545 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5546 "LookupPrivilegeValueA");
5547 }
5548 initialized = TRUE;
5549 }
5550 }
5552 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5553 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5554 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5555 assert(initialized && _AdjustTokenPrivileges != NULL,
5556 "AdvapiAvailable() not yet called");
5557 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5558 BufferLength, PreviousState, ReturnLength);
5559 }
5561 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5562 PHANDLE TokenHandle) {
5563 assert(initialized && _OpenProcessToken != NULL,
5564 "AdvapiAvailable() not yet called");
5565 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5566 }
5568 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5569 assert(initialized && _LookupPrivilegeValue != NULL,
5570 "AdvapiAvailable() not yet called");
5571 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5572 }
5574 BOOL os::Advapi32Dll::AdvapiAvailable() {
5575 if (!initialized) {
5576 initialize();
5577 }
5578 return _AdjustTokenPrivileges != NULL &&
5579 _OpenProcessToken != NULL &&
5580 _LookupPrivilegeValue != NULL;
5581 }
5583 #endif