Mon, 13 Oct 2014 22:11:39 +0200
7102541: RFE: os::set_native_thread_name() cleanups
Summary: implement os::set_native_thread_name() on windows, linux
Reviewed-by: sla, ctornqvi, simonis
Contributed-by: thomas.stuefe@sap.com
1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #else
115 #ifdef _M_AMD64
116 #define __CPU__ amd64
117 #else
118 #define __CPU__ i486
119 #endif
120 #endif
122 // save DLL module handle, used by GetModuleFileName
124 HINSTANCE vm_lib_handle;
126 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
127 switch (reason) {
128 case DLL_PROCESS_ATTACH:
129 vm_lib_handle = hinst;
130 if(ForceTimeHighResolution)
131 timeBeginPeriod(1L);
132 break;
133 case DLL_PROCESS_DETACH:
134 if(ForceTimeHighResolution)
135 timeEndPeriod(1L);
137 break;
138 default:
139 break;
140 }
141 return true;
142 }
144 static inline double fileTimeAsDouble(FILETIME* time) {
145 const double high = (double) ((unsigned int) ~0);
146 const double split = 10000000.0;
147 double result = (time->dwLowDateTime / split) +
148 time->dwHighDateTime * (high/split);
149 return result;
150 }
152 // Implementation of os
154 bool os::getenv(const char* name, char* buffer, int len) {
155 int result = GetEnvironmentVariable(name, buffer, len);
156 return result > 0 && result < len;
157 }
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
177 #ifndef _WIN64
178 // previous UnhandledExceptionFilter, if there is one
179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
182 #endif
183 void os::init_system_properties_values() {
184 /* sysclasspath, java_home, dll_dir */
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH];
192 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; /* get rid of \{client|server} */
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL)
202 *pslash = '\0'; /* get rid of \bin */
203 }
204 }
206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
207 if (home_path == NULL)
208 return;
209 strcpy(home_path, home_dir);
210 Arguments::set_java_home(home_path);
212 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
213 if (dll_path == NULL)
214 return;
215 strcpy(dll_path, home_dir);
216 strcat(dll_path, bin);
217 Arguments::set_dll_dir(dll_path);
219 if (!set_boot_path('\\', ';'))
220 return;
221 }
223 /* library_path */
224 #define EXT_DIR "\\lib\\ext"
225 #define BIN_DIR "\\bin"
226 #define PACKAGE_DIR "\\Sun\\Java"
227 {
228 /* Win32 library search order (See the documentation for LoadLibrary):
229 *
230 * 1. The directory from which application is loaded.
231 * 2. The system wide Java Extensions directory (Java only)
232 * 3. System directory (GetSystemDirectory)
233 * 4. Windows directory (GetWindowsDirectory)
234 * 5. The PATH environment variable
235 * 6. The current directory
236 */
238 char *library_path;
239 char tmp[MAX_PATH];
240 char *path_str = ::getenv("PATH");
242 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
243 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
245 library_path[0] = '\0';
247 GetModuleFileName(NULL, tmp, sizeof(tmp));
248 *(strrchr(tmp, '\\')) = '\0';
249 strcat(library_path, tmp);
251 GetWindowsDirectory(tmp, sizeof(tmp));
252 strcat(library_path, ";");
253 strcat(library_path, tmp);
254 strcat(library_path, PACKAGE_DIR BIN_DIR);
256 GetSystemDirectory(tmp, sizeof(tmp));
257 strcat(library_path, ";");
258 strcat(library_path, tmp);
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
264 if (path_str) {
265 strcat(library_path, ";");
266 strcat(library_path, path_str);
267 }
269 strcat(library_path, ";.");
271 Arguments::set_library_path(library_path);
272 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
273 }
275 /* Default extensions directory */
276 {
277 char path[MAX_PATH];
278 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
279 GetWindowsDirectory(path, MAX_PATH);
280 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
281 path, PACKAGE_DIR, EXT_DIR);
282 Arguments::set_ext_dirs(buf);
283 }
284 #undef EXT_DIR
285 #undef BIN_DIR
286 #undef PACKAGE_DIR
288 /* Default endorsed standards directory. */
289 {
290 #define ENDORSED_DIR "\\lib\\endorsed"
291 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
292 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
293 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
294 Arguments::set_endorsed_dirs(buf);
295 #undef ENDORSED_DIR
296 }
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
303 // Done
304 return;
305 }
307 void os::breakpoint() {
308 DebugBreak();
309 }
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
316 /*
317 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 * So far, this method is only used by Native Memory Tracking, which is
319 * only supported on Windows XP or later.
320 */
322 int os::get_native_stack(address* stack, int frames, int toSkip) {
323 #ifdef _NMT_NOINLINE_
324 toSkip ++;
325 #endif
326 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
327 (PVOID*)stack, NULL);
328 for (int index = captured; index < frames; index ++) {
329 stack[index] = NULL;
330 }
331 return captured;
332 }
335 // os::current_stack_base()
336 //
337 // Returns the base of the stack, which is the stack's
338 // starting address. This function must be called
339 // while running on the stack of the thread being queried.
341 address os::current_stack_base() {
342 MEMORY_BASIC_INFORMATION minfo;
343 address stack_bottom;
344 size_t stack_size;
346 VirtualQuery(&minfo, &minfo, sizeof(minfo));
347 stack_bottom = (address)minfo.AllocationBase;
348 stack_size = minfo.RegionSize;
350 // Add up the sizes of all the regions with the same
351 // AllocationBase.
352 while( 1 )
353 {
354 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
355 if ( stack_bottom == (address)minfo.AllocationBase )
356 stack_size += minfo.RegionSize;
357 else
358 break;
359 }
361 #ifdef _M_IA64
362 // IA64 has memory and register stacks
363 //
364 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
365 // at thread creation (1MB backing store growing upwards, 1MB memory stack
366 // growing downwards, 2MB summed up)
367 //
368 // ...
369 // ------- top of stack (high address) -----
370 // |
371 // | 1MB
372 // | Backing Store (Register Stack)
373 // |
374 // | / \
375 // | |
376 // | |
377 // | |
378 // ------------------------ stack base -----
379 // | 1MB
380 // | Memory Stack
381 // |
382 // | |
383 // | |
384 // | |
385 // | \ /
386 // |
387 // ----- bottom of stack (low address) -----
388 // ...
390 stack_size = stack_size / 2;
391 #endif
392 return stack_bottom + stack_size;
393 }
395 size_t os::current_stack_size() {
396 size_t sz;
397 MEMORY_BASIC_INFORMATION minfo;
398 VirtualQuery(&minfo, &minfo, sizeof(minfo));
399 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
400 return sz;
401 }
403 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
404 const struct tm* time_struct_ptr = localtime(clock);
405 if (time_struct_ptr != NULL) {
406 *res = *time_struct_ptr;
407 return res;
408 }
409 return NULL;
410 }
412 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
414 // Thread start routine for all new Java threads
415 static unsigned __stdcall java_start(Thread* thread) {
416 // Try to randomize the cache line index of hot stack frames.
417 // This helps when threads of the same stack traces evict each other's
418 // cache lines. The threads can be either from the same JVM instance, or
419 // from different JVM instances. The benefit is especially true for
420 // processors with hyperthreading technology.
421 static int counter = 0;
422 int pid = os::current_process_id();
423 _alloca(((pid ^ counter++) & 7) * 128);
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
436 // Install a win32 structured exception handler around every thread created
437 // by VM, so VM can genrate error dump when an exception occurred in non-
438 // Java thread (e.g. VM thread).
439 __try {
440 thread->run();
441 } __except(topLevelExceptionFilter(
442 (_EXCEPTION_POINTERS*)_exception_info())) {
443 // Nothing to do.
444 }
446 // One less thread is executing
447 // When the VMThread gets here, the main thread may have already exited
448 // which frees the CodeHeap containing the Atomic::add code
449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
451 }
453 return 0;
454 }
456 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
457 // Allocate the OSThread object
458 OSThread* osthread = new OSThread(NULL, NULL);
459 if (osthread == NULL) return NULL;
461 // Initialize support for Java interrupts
462 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
463 if (interrupt_event == NULL) {
464 delete osthread;
465 return NULL;
466 }
467 osthread->set_interrupt_event(interrupt_event);
469 // Store info on the Win32 thread into the OSThread
470 osthread->set_thread_handle(thread_handle);
471 osthread->set_thread_id(thread_id);
473 if (UseNUMA) {
474 int lgrp_id = os::numa_get_group_id();
475 if (lgrp_id != -1) {
476 thread->set_lgrp_id(lgrp_id);
477 }
478 }
480 // Initial thread state is INITIALIZED, not SUSPENDED
481 osthread->set_state(INITIALIZED);
483 return osthread;
484 }
487 bool os::create_attached_thread(JavaThread* thread) {
488 #ifdef ASSERT
489 thread->verify_not_published();
490 #endif
491 HANDLE thread_h;
492 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
493 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
494 fatal("DuplicateHandle failed\n");
495 }
496 OSThread* osthread = create_os_thread(thread, thread_h,
497 (int)current_thread_id());
498 if (osthread == NULL) {
499 return false;
500 }
502 // Initial thread state is RUNNABLE
503 osthread->set_state(RUNNABLE);
505 thread->set_osthread(osthread);
506 return true;
507 }
509 bool os::create_main_thread(JavaThread* thread) {
510 #ifdef ASSERT
511 thread->verify_not_published();
512 #endif
513 if (_starting_thread == NULL) {
514 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
515 if (_starting_thread == NULL) {
516 return false;
517 }
518 }
520 // The primordial thread is runnable from the start)
521 _starting_thread->set_state(RUNNABLE);
523 thread->set_osthread(_starting_thread);
524 return true;
525 }
527 // Allocate and initialize a new OSThread
528 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
529 unsigned thread_id;
531 // Allocate the OSThread object
532 OSThread* osthread = new OSThread(NULL, NULL);
533 if (osthread == NULL) {
534 return false;
535 }
537 // Initialize support for Java interrupts
538 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
539 if (interrupt_event == NULL) {
540 delete osthread;
541 return NULL;
542 }
543 osthread->set_interrupt_event(interrupt_event);
544 osthread->set_interrupted(false);
546 thread->set_osthread(osthread);
548 if (stack_size == 0) {
549 switch (thr_type) {
550 case os::java_thread:
551 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
552 if (JavaThread::stack_size_at_create() > 0)
553 stack_size = JavaThread::stack_size_at_create();
554 break;
555 case os::compiler_thread:
556 if (CompilerThreadStackSize > 0) {
557 stack_size = (size_t)(CompilerThreadStackSize * K);
558 break;
559 } // else fall through:
560 // use VMThreadStackSize if CompilerThreadStackSize is not defined
561 case os::vm_thread:
562 case os::pgc_thread:
563 case os::cgc_thread:
564 case os::watcher_thread:
565 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
566 break;
567 }
568 }
570 // Create the Win32 thread
571 //
572 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
573 // does not specify stack size. Instead, it specifies the size of
574 // initially committed space. The stack size is determined by
575 // PE header in the executable. If the committed "stack_size" is larger
576 // than default value in the PE header, the stack is rounded up to the
577 // nearest multiple of 1MB. For example if the launcher has default
578 // stack size of 320k, specifying any size less than 320k does not
579 // affect the actual stack size at all, it only affects the initial
580 // commitment. On the other hand, specifying 'stack_size' larger than
581 // default value may cause significant increase in memory usage, because
582 // not only the stack space will be rounded up to MB, but also the
583 // entire space is committed upfront.
584 //
585 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
586 // for CreateThread() that can treat 'stack_size' as stack size. However we
587 // are not supposed to call CreateThread() directly according to MSDN
588 // document because JVM uses C runtime library. The good news is that the
589 // flag appears to work with _beginthredex() as well.
591 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
592 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
593 #endif
595 HANDLE thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
601 &thread_id);
602 if (thread_handle == NULL) {
603 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
604 // without the flag.
605 thread_handle =
606 (HANDLE)_beginthreadex(NULL,
607 (unsigned)stack_size,
608 (unsigned (__stdcall *)(void*)) java_start,
609 thread,
610 CREATE_SUSPENDED,
611 &thread_id);
612 }
613 if (thread_handle == NULL) {
614 // Need to clean up stuff we've allocated so far
615 CloseHandle(osthread->interrupt_event());
616 thread->set_osthread(NULL);
617 delete osthread;
618 return NULL;
619 }
621 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
623 // Store info on the Win32 thread into the OSThread
624 osthread->set_thread_handle(thread_handle);
625 osthread->set_thread_id(thread_id);
627 // Initial thread state is INITIALIZED, not SUSPENDED
628 osthread->set_state(INITIALIZED);
630 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
631 return true;
632 }
635 // Free Win32 resources related to the OSThread
636 void os::free_thread(OSThread* osthread) {
637 assert(osthread != NULL, "osthread not set");
638 CloseHandle(osthread->thread_handle());
639 CloseHandle(osthread->interrupt_event());
640 delete osthread;
641 }
644 static int has_performance_count = 0;
645 static jlong first_filetime;
646 static jlong initial_performance_count;
647 static jlong performance_frequency;
650 jlong as_long(LARGE_INTEGER x) {
651 jlong result = 0; // initialization to avoid warning
652 set_high(&result, x.HighPart);
653 set_low(&result, x.LowPart);
654 return result;
655 }
658 jlong os::elapsed_counter() {
659 LARGE_INTEGER count;
660 if (has_performance_count) {
661 QueryPerformanceCounter(&count);
662 return as_long(count) - initial_performance_count;
663 } else {
664 FILETIME wt;
665 GetSystemTimeAsFileTime(&wt);
666 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
667 }
668 }
671 jlong os::elapsed_frequency() {
672 if (has_performance_count) {
673 return performance_frequency;
674 } else {
675 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
676 return 10000000;
677 }
678 }
681 julong os::available_memory() {
682 return win32::available_memory();
683 }
685 julong os::win32::available_memory() {
686 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
687 // value if total memory is larger than 4GB
688 MEMORYSTATUSEX ms;
689 ms.dwLength = sizeof(ms);
690 GlobalMemoryStatusEx(&ms);
692 return (julong)ms.ullAvailPhys;
693 }
695 julong os::physical_memory() {
696 return win32::physical_memory();
697 }
699 bool os::has_allocatable_memory_limit(julong* limit) {
700 MEMORYSTATUSEX ms;
701 ms.dwLength = sizeof(ms);
702 GlobalMemoryStatusEx(&ms);
703 #ifdef _LP64
704 *limit = (julong)ms.ullAvailVirtual;
705 return true;
706 #else
707 // Limit to 1400m because of the 2gb address space wall
708 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
709 return true;
710 #endif
711 }
713 // VC6 lacks DWORD_PTR
714 #if _MSC_VER < 1300
715 typedef UINT_PTR DWORD_PTR;
716 #endif
718 int os::active_processor_count() {
719 // User has overridden the number of active processors
720 if (ActiveProcessorCount > 0) {
721 if (PrintActiveCpus) {
722 tty->print_cr("active_processor_count: "
723 "active processor count set by user : %d",
724 ActiveProcessorCount);
725 }
726 return ActiveProcessorCount;
727 }
729 DWORD_PTR lpProcessAffinityMask = 0;
730 DWORD_PTR lpSystemAffinityMask = 0;
731 int proc_count = processor_count();
732 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
733 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
734 // Nof active processors is number of bits in process affinity mask
735 int bitcount = 0;
736 while (lpProcessAffinityMask != 0) {
737 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
738 bitcount++;
739 }
740 return bitcount;
741 } else {
742 return proc_count;
743 }
744 }
746 void os::set_native_thread_name(const char *name) {
748 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
749 //
750 // Note that unfortunately this only works if the process
751 // is already attached to a debugger; debugger must observe
752 // the exception below to show the correct name.
754 const DWORD MS_VC_EXCEPTION = 0x406D1388;
755 struct {
756 DWORD dwType; // must be 0x1000
757 LPCSTR szName; // pointer to name (in user addr space)
758 DWORD dwThreadID; // thread ID (-1=caller thread)
759 DWORD dwFlags; // reserved for future use, must be zero
760 } info;
762 info.dwType = 0x1000;
763 info.szName = name;
764 info.dwThreadID = -1;
765 info.dwFlags = 0;
767 __try {
768 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
769 } __except(EXCEPTION_CONTINUE_EXECUTION) {}
770 }
772 bool os::distribute_processes(uint length, uint* distribution) {
773 // Not yet implemented.
774 return false;
775 }
777 bool os::bind_to_processor(uint processor_id) {
778 // Not yet implemented.
779 return false;
780 }
782 static void initialize_performance_counter() {
783 LARGE_INTEGER count;
784 if (QueryPerformanceFrequency(&count)) {
785 has_performance_count = 1;
786 performance_frequency = as_long(count);
787 QueryPerformanceCounter(&count);
788 initial_performance_count = as_long(count);
789 } else {
790 has_performance_count = 0;
791 FILETIME wt;
792 GetSystemTimeAsFileTime(&wt);
793 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
794 }
795 }
798 double os::elapsedTime() {
799 return (double) elapsed_counter() / (double) elapsed_frequency();
800 }
803 // Windows format:
804 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
805 // Java format:
806 // Java standards require the number of milliseconds since 1/1/1970
808 // Constant offset - calculated using offset()
809 static jlong _offset = 116444736000000000;
810 // Fake time counter for reproducible results when debugging
811 static jlong fake_time = 0;
813 #ifdef ASSERT
814 // Just to be safe, recalculate the offset in debug mode
815 static jlong _calculated_offset = 0;
816 static int _has_calculated_offset = 0;
818 jlong offset() {
819 if (_has_calculated_offset) return _calculated_offset;
820 SYSTEMTIME java_origin;
821 java_origin.wYear = 1970;
822 java_origin.wMonth = 1;
823 java_origin.wDayOfWeek = 0; // ignored
824 java_origin.wDay = 1;
825 java_origin.wHour = 0;
826 java_origin.wMinute = 0;
827 java_origin.wSecond = 0;
828 java_origin.wMilliseconds = 0;
829 FILETIME jot;
830 if (!SystemTimeToFileTime(&java_origin, &jot)) {
831 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
832 }
833 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
834 _has_calculated_offset = 1;
835 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
836 return _calculated_offset;
837 }
838 #else
839 jlong offset() {
840 return _offset;
841 }
842 #endif
844 jlong windows_to_java_time(FILETIME wt) {
845 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
846 return (a - offset()) / 10000;
847 }
849 FILETIME java_to_windows_time(jlong l) {
850 jlong a = (l * 10000) + offset();
851 FILETIME result;
852 result.dwHighDateTime = high(a);
853 result.dwLowDateTime = low(a);
854 return result;
855 }
857 bool os::supports_vtime() { return true; }
858 bool os::enable_vtime() { return false; }
859 bool os::vtime_enabled() { return false; }
861 double os::elapsedVTime() {
862 FILETIME created;
863 FILETIME exited;
864 FILETIME kernel;
865 FILETIME user;
866 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
867 // the resolution of windows_to_java_time() should be sufficient (ms)
868 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
869 } else {
870 return elapsedTime();
871 }
872 }
874 jlong os::javaTimeMillis() {
875 if (UseFakeTimers) {
876 return fake_time++;
877 } else {
878 FILETIME wt;
879 GetSystemTimeAsFileTime(&wt);
880 return windows_to_java_time(wt);
881 }
882 }
884 jlong os::javaTimeNanos() {
885 if (!has_performance_count) {
886 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
887 } else {
888 LARGE_INTEGER current_count;
889 QueryPerformanceCounter(¤t_count);
890 double current = as_long(current_count);
891 double freq = performance_frequency;
892 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
893 return time;
894 }
895 }
897 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
898 if (!has_performance_count) {
899 // javaTimeMillis() doesn't have much percision,
900 // but it is not going to wrap -- so all 64 bits
901 info_ptr->max_value = ALL_64_BITS;
903 // this is a wall clock timer, so may skip
904 info_ptr->may_skip_backward = true;
905 info_ptr->may_skip_forward = true;
906 } else {
907 jlong freq = performance_frequency;
908 if (freq < NANOSECS_PER_SEC) {
909 // the performance counter is 64 bits and we will
910 // be multiplying it -- so no wrap in 64 bits
911 info_ptr->max_value = ALL_64_BITS;
912 } else if (freq > NANOSECS_PER_SEC) {
913 // use the max value the counter can reach to
914 // determine the max value which could be returned
915 julong max_counter = (julong)ALL_64_BITS;
916 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
917 } else {
918 // the performance counter is 64 bits and we will
919 // be using it directly -- so no wrap in 64 bits
920 info_ptr->max_value = ALL_64_BITS;
921 }
923 // using a counter, so no skipping
924 info_ptr->may_skip_backward = false;
925 info_ptr->may_skip_forward = false;
926 }
927 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
928 }
930 char* os::local_time_string(char *buf, size_t buflen) {
931 SYSTEMTIME st;
932 GetLocalTime(&st);
933 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
934 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
935 return buf;
936 }
938 bool os::getTimesSecs(double* process_real_time,
939 double* process_user_time,
940 double* process_system_time) {
941 HANDLE h_process = GetCurrentProcess();
942 FILETIME create_time, exit_time, kernel_time, user_time;
943 BOOL result = GetProcessTimes(h_process,
944 &create_time,
945 &exit_time,
946 &kernel_time,
947 &user_time);
948 if (result != 0) {
949 FILETIME wt;
950 GetSystemTimeAsFileTime(&wt);
951 jlong rtc_millis = windows_to_java_time(wt);
952 jlong user_millis = windows_to_java_time(user_time);
953 jlong system_millis = windows_to_java_time(kernel_time);
954 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
955 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
956 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
957 return true;
958 } else {
959 return false;
960 }
961 }
963 void os::shutdown() {
965 // allow PerfMemory to attempt cleanup of any persistent resources
966 perfMemory_exit();
968 // flush buffered output, finish log files
969 ostream_abort();
971 // Check for abort hook
972 abort_hook_t abort_hook = Arguments::abort_hook();
973 if (abort_hook != NULL) {
974 abort_hook();
975 }
976 }
979 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
980 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
982 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
983 HINSTANCE dbghelp;
984 EXCEPTION_POINTERS ep;
985 MINIDUMP_EXCEPTION_INFORMATION mei;
986 MINIDUMP_EXCEPTION_INFORMATION* pmei;
988 HANDLE hProcess = GetCurrentProcess();
989 DWORD processId = GetCurrentProcessId();
990 HANDLE dumpFile;
991 MINIDUMP_TYPE dumpType;
992 static const char* cwd;
994 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
995 #ifndef ASSERT
996 // If running on a client version of Windows and user has not explicitly enabled dumping
997 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
998 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
999 return;
1000 // If running on a server version of Windows and user has explictly disabled dumping
1001 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1002 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1003 return;
1004 }
1005 #else
1006 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
1007 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
1008 return;
1009 }
1010 #endif
1012 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
1014 if (dbghelp == NULL) {
1015 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
1016 return;
1017 }
1019 _MiniDumpWriteDump = CAST_TO_FN_PTR(
1020 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
1021 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
1022 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
1024 if (_MiniDumpWriteDump == NULL) {
1025 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1026 return;
1027 }
1029 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1031 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1032 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1033 #if API_VERSION_NUMBER >= 11
1034 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1035 MiniDumpWithUnloadedModules);
1036 #endif
1038 cwd = get_current_directory(NULL, 0);
1039 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1040 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1042 if (dumpFile == INVALID_HANDLE_VALUE) {
1043 VMError::report_coredump_status("Failed to create file for dumping", false);
1044 return;
1045 }
1046 if (exceptionRecord != NULL && contextRecord != NULL) {
1047 ep.ContextRecord = (PCONTEXT) contextRecord;
1048 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1050 mei.ThreadId = GetCurrentThreadId();
1051 mei.ExceptionPointers = &ep;
1052 pmei = &mei;
1053 } else {
1054 pmei = NULL;
1055 }
1058 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1059 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1060 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1061 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1062 DWORD error = GetLastError();
1063 LPTSTR msgbuf = NULL;
1065 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1066 FORMAT_MESSAGE_FROM_SYSTEM |
1067 FORMAT_MESSAGE_IGNORE_INSERTS,
1068 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1070 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1071 LocalFree(msgbuf);
1072 } else {
1073 // Call to FormatMessage failed, just include the result from GetLastError
1074 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1075 }
1076 VMError::report_coredump_status(buffer, false);
1077 } else {
1078 VMError::report_coredump_status(buffer, true);
1079 }
1081 CloseHandle(dumpFile);
1082 }
1086 void os::abort(bool dump_core)
1087 {
1088 os::shutdown();
1089 // no core dump on Windows
1090 ::exit(1);
1091 }
1093 // Die immediately, no exit hook, no abort hook, no cleanup.
1094 void os::die() {
1095 _exit(-1);
1096 }
1098 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1099 // * dirent_md.c 1.15 00/02/02
1100 //
1101 // The declarations for DIR and struct dirent are in jvm_win32.h.
1103 /* Caller must have already run dirname through JVM_NativePath, which removes
1104 duplicate slashes and converts all instances of '/' into '\\'. */
1106 DIR *
1107 os::opendir(const char *dirname)
1108 {
1109 assert(dirname != NULL, "just checking"); // hotspot change
1110 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1111 DWORD fattr; // hotspot change
1112 char alt_dirname[4] = { 0, 0, 0, 0 };
1114 if (dirp == 0) {
1115 errno = ENOMEM;
1116 return 0;
1117 }
1119 /*
1120 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1121 * as a directory in FindFirstFile(). We detect this case here and
1122 * prepend the current drive name.
1123 */
1124 if (dirname[1] == '\0' && dirname[0] == '\\') {
1125 alt_dirname[0] = _getdrive() + 'A' - 1;
1126 alt_dirname[1] = ':';
1127 alt_dirname[2] = '\\';
1128 alt_dirname[3] = '\0';
1129 dirname = alt_dirname;
1130 }
1132 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1133 if (dirp->path == 0) {
1134 free(dirp, mtInternal);
1135 errno = ENOMEM;
1136 return 0;
1137 }
1138 strcpy(dirp->path, dirname);
1140 fattr = GetFileAttributes(dirp->path);
1141 if (fattr == 0xffffffff) {
1142 free(dirp->path, mtInternal);
1143 free(dirp, mtInternal);
1144 errno = ENOENT;
1145 return 0;
1146 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1147 free(dirp->path, mtInternal);
1148 free(dirp, mtInternal);
1149 errno = ENOTDIR;
1150 return 0;
1151 }
1153 /* Append "*.*", or possibly "\\*.*", to path */
1154 if (dirp->path[1] == ':'
1155 && (dirp->path[2] == '\0'
1156 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1157 /* No '\\' needed for cases like "Z:" or "Z:\" */
1158 strcat(dirp->path, "*.*");
1159 } else {
1160 strcat(dirp->path, "\\*.*");
1161 }
1163 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1164 if (dirp->handle == INVALID_HANDLE_VALUE) {
1165 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1166 free(dirp->path, mtInternal);
1167 free(dirp, mtInternal);
1168 errno = EACCES;
1169 return 0;
1170 }
1171 }
1172 return dirp;
1173 }
1175 /* parameter dbuf unused on Windows */
1177 struct dirent *
1178 os::readdir(DIR *dirp, dirent *dbuf)
1179 {
1180 assert(dirp != NULL, "just checking"); // hotspot change
1181 if (dirp->handle == INVALID_HANDLE_VALUE) {
1182 return 0;
1183 }
1185 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1187 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1188 if (GetLastError() == ERROR_INVALID_HANDLE) {
1189 errno = EBADF;
1190 return 0;
1191 }
1192 FindClose(dirp->handle);
1193 dirp->handle = INVALID_HANDLE_VALUE;
1194 }
1196 return &dirp->dirent;
1197 }
1199 int
1200 os::closedir(DIR *dirp)
1201 {
1202 assert(dirp != NULL, "just checking"); // hotspot change
1203 if (dirp->handle != INVALID_HANDLE_VALUE) {
1204 if (!FindClose(dirp->handle)) {
1205 errno = EBADF;
1206 return -1;
1207 }
1208 dirp->handle = INVALID_HANDLE_VALUE;
1209 }
1210 free(dirp->path, mtInternal);
1211 free(dirp, mtInternal);
1212 return 0;
1213 }
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() {
1218 static char path_buf[MAX_PATH];
1219 if (GetTempPath(MAX_PATH, path_buf)>0)
1220 return path_buf;
1221 else{
1222 path_buf[0]='\0';
1223 return path_buf;
1224 }
1225 }
1227 static bool file_exists(const char* filename) {
1228 if (filename == NULL || strlen(filename) == 0) {
1229 return false;
1230 }
1231 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1232 }
1234 bool os::dll_build_name(char *buffer, size_t buflen,
1235 const char* pname, const char* fname) {
1236 bool retval = false;
1237 const size_t pnamelen = pname ? strlen(pname) : 0;
1238 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1240 // Return error on buffer overflow.
1241 if (pnamelen + strlen(fname) + 10 > buflen) {
1242 return retval;
1243 }
1245 if (pnamelen == 0) {
1246 jio_snprintf(buffer, buflen, "%s.dll", fname);
1247 retval = true;
1248 } else if (c == ':' || c == '\\') {
1249 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1250 retval = true;
1251 } else if (strchr(pname, *os::path_separator()) != NULL) {
1252 int n;
1253 char** pelements = split_path(pname, &n);
1254 if (pelements == NULL) {
1255 return false;
1256 }
1257 for (int i = 0 ; i < n ; i++) {
1258 char* path = pelements[i];
1259 // Really shouldn't be NULL, but check can't hurt
1260 size_t plen = (path == NULL) ? 0 : strlen(path);
1261 if (plen == 0) {
1262 continue; // skip the empty path values
1263 }
1264 const char lastchar = path[plen - 1];
1265 if (lastchar == ':' || lastchar == '\\') {
1266 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1267 } else {
1268 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1269 }
1270 if (file_exists(buffer)) {
1271 retval = true;
1272 break;
1273 }
1274 }
1275 // release the storage
1276 for (int i = 0 ; i < n ; i++) {
1277 if (pelements[i] != NULL) {
1278 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1279 }
1280 }
1281 if (pelements != NULL) {
1282 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1283 }
1284 } else {
1285 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1286 retval = true;
1287 }
1288 return retval;
1289 }
1291 // Needs to be in os specific directory because windows requires another
1292 // header file <direct.h>
1293 const char* os::get_current_directory(char *buf, size_t buflen) {
1294 int n = static_cast<int>(buflen);
1295 if (buflen > INT_MAX) n = INT_MAX;
1296 return _getcwd(buf, n);
1297 }
1299 //-----------------------------------------------------------
1300 // Helper functions for fatal error handler
1301 #ifdef _WIN64
1302 // Helper routine which returns true if address in
1303 // within the NTDLL address space.
1304 //
1305 static bool _addr_in_ntdll( address addr )
1306 {
1307 HMODULE hmod;
1308 MODULEINFO minfo;
1310 hmod = GetModuleHandle("NTDLL.DLL");
1311 if ( hmod == NULL ) return false;
1312 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1313 &minfo, sizeof(MODULEINFO)) )
1314 return false;
1316 if ( (addr >= minfo.lpBaseOfDll) &&
1317 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1318 return true;
1319 else
1320 return false;
1321 }
1322 #endif
1325 // Enumerate all modules for a given process ID
1326 //
1327 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1328 // different API for doing this. We use PSAPI.DLL on NT based
1329 // Windows and ToolHelp on 95/98/Me.
1331 // Callback function that is called by enumerate_modules() on
1332 // every DLL module.
1333 // Input parameters:
1334 // int pid,
1335 // char* module_file_name,
1336 // address module_base_addr,
1337 // unsigned module_size,
1338 // void* param
1339 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1341 // enumerate_modules for Windows NT, using PSAPI
1342 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1343 {
1344 HANDLE hProcess ;
1346 # define MAX_NUM_MODULES 128
1347 HMODULE modules[MAX_NUM_MODULES];
1348 static char filename[ MAX_PATH ];
1349 int result = 0;
1351 if (!os::PSApiDll::PSApiAvailable()) {
1352 return 0;
1353 }
1355 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1356 FALSE, pid ) ;
1357 if (hProcess == NULL) return 0;
1359 DWORD size_needed;
1360 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1361 sizeof(modules), &size_needed)) {
1362 CloseHandle( hProcess );
1363 return 0;
1364 }
1366 // number of modules that are currently loaded
1367 int num_modules = size_needed / sizeof(HMODULE);
1369 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1370 // Get Full pathname:
1371 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1372 filename, sizeof(filename))) {
1373 filename[0] = '\0';
1374 }
1376 MODULEINFO modinfo;
1377 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1378 &modinfo, sizeof(modinfo))) {
1379 modinfo.lpBaseOfDll = NULL;
1380 modinfo.SizeOfImage = 0;
1381 }
1383 // Invoke callback function
1384 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1385 modinfo.SizeOfImage, param);
1386 if (result) break;
1387 }
1389 CloseHandle( hProcess ) ;
1390 return result;
1391 }
1394 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1395 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1396 {
1397 HANDLE hSnapShot ;
1398 static MODULEENTRY32 modentry ;
1399 int result = 0;
1401 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1402 return 0;
1403 }
1405 // Get a handle to a Toolhelp snapshot of the system
1406 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1407 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1408 return FALSE ;
1409 }
1411 // iterate through all modules
1412 modentry.dwSize = sizeof(MODULEENTRY32) ;
1413 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1415 while( not_done ) {
1416 // invoke the callback
1417 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1418 modentry.modBaseSize, param);
1419 if (result) break;
1421 modentry.dwSize = sizeof(MODULEENTRY32) ;
1422 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1423 }
1425 CloseHandle(hSnapShot);
1426 return result;
1427 }
1429 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1430 {
1431 // Get current process ID if caller doesn't provide it.
1432 if (!pid) pid = os::current_process_id();
1434 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1435 else return _enumerate_modules_windows(pid, func, param);
1436 }
1438 struct _modinfo {
1439 address addr;
1440 char* full_path; // point to a char buffer
1441 int buflen; // size of the buffer
1442 address base_addr;
1443 };
1445 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1446 unsigned size, void * param) {
1447 struct _modinfo *pmod = (struct _modinfo *)param;
1448 if (!pmod) return -1;
1450 if (base_addr <= pmod->addr &&
1451 base_addr+size > pmod->addr) {
1452 // if a buffer is provided, copy path name to the buffer
1453 if (pmod->full_path) {
1454 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1455 }
1456 pmod->base_addr = base_addr;
1457 return 1;
1458 }
1459 return 0;
1460 }
1462 bool os::dll_address_to_library_name(address addr, char* buf,
1463 int buflen, int* offset) {
1464 // buf is not optional, but offset is optional
1465 assert(buf != NULL, "sanity check");
1467 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1468 // return the full path to the DLL file, sometimes it returns path
1469 // to the corresponding PDB file (debug info); sometimes it only
1470 // returns partial path, which makes life painful.
1472 struct _modinfo mi;
1473 mi.addr = addr;
1474 mi.full_path = buf;
1475 mi.buflen = buflen;
1476 int pid = os::current_process_id();
1477 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1478 // buf already contains path name
1479 if (offset) *offset = addr - mi.base_addr;
1480 return true;
1481 }
1483 buf[0] = '\0';
1484 if (offset) *offset = -1;
1485 return false;
1486 }
1488 bool os::dll_address_to_function_name(address addr, char *buf,
1489 int buflen, int *offset) {
1490 // buf is not optional, but offset is optional
1491 assert(buf != NULL, "sanity check");
1493 if (Decoder::decode(addr, buf, buflen, offset)) {
1494 return true;
1495 }
1496 if (offset != NULL) *offset = -1;
1497 buf[0] = '\0';
1498 return false;
1499 }
1501 // save the start and end address of jvm.dll into param[0] and param[1]
1502 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1503 unsigned size, void * param) {
1504 if (!param) return -1;
1506 if (base_addr <= (address)_locate_jvm_dll &&
1507 base_addr+size > (address)_locate_jvm_dll) {
1508 ((address*)param)[0] = base_addr;
1509 ((address*)param)[1] = base_addr + size;
1510 return 1;
1511 }
1512 return 0;
1513 }
1515 address vm_lib_location[2]; // start and end address of jvm.dll
1517 // check if addr is inside jvm.dll
1518 bool os::address_is_in_vm(address addr) {
1519 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1520 int pid = os::current_process_id();
1521 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1522 assert(false, "Can't find jvm module.");
1523 return false;
1524 }
1525 }
1527 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1528 }
1530 // print module info; param is outputStream*
1531 static int _print_module(int pid, char* fname, address base,
1532 unsigned size, void* param) {
1533 if (!param) return -1;
1535 outputStream* st = (outputStream*)param;
1537 address end_addr = base + size;
1538 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1539 return 0;
1540 }
1542 // Loads .dll/.so and
1543 // in case of error it checks if .dll/.so was built for the
1544 // same architecture as Hotspot is running on
1545 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1546 {
1547 void * result = LoadLibrary(name);
1548 if (result != NULL)
1549 {
1550 return result;
1551 }
1553 DWORD errcode = GetLastError();
1554 if (errcode == ERROR_MOD_NOT_FOUND) {
1555 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1556 ebuf[ebuflen-1]='\0';
1557 return NULL;
1558 }
1560 // Parsing dll below
1561 // If we can read dll-info and find that dll was built
1562 // for an architecture other than Hotspot is running in
1563 // - then print to buffer "DLL was built for a different architecture"
1564 // else call os::lasterror to obtain system error message
1566 // Read system error message into ebuf
1567 // It may or may not be overwritten below (in the for loop and just above)
1568 lasterror(ebuf, (size_t) ebuflen);
1569 ebuf[ebuflen-1]='\0';
1570 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1571 if (file_descriptor<0)
1572 {
1573 return NULL;
1574 }
1576 uint32_t signature_offset;
1577 uint16_t lib_arch=0;
1578 bool failed_to_get_lib_arch=
1579 (
1580 //Go to position 3c in the dll
1581 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1582 ||
1583 // Read loacation of signature
1584 (sizeof(signature_offset)!=
1585 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1586 ||
1587 //Go to COFF File Header in dll
1588 //that is located after"signature" (4 bytes long)
1589 (os::seek_to_file_offset(file_descriptor,
1590 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1591 ||
1592 //Read field that contains code of architecture
1593 // that dll was build for
1594 (sizeof(lib_arch)!=
1595 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1596 );
1598 ::close(file_descriptor);
1599 if (failed_to_get_lib_arch)
1600 {
1601 // file i/o error - report os::lasterror(...) msg
1602 return NULL;
1603 }
1605 typedef struct
1606 {
1607 uint16_t arch_code;
1608 char* arch_name;
1609 } arch_t;
1611 static const arch_t arch_array[]={
1612 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1613 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1614 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1615 };
1616 #if (defined _M_IA64)
1617 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1618 #elif (defined _M_AMD64)
1619 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1620 #elif (defined _M_IX86)
1621 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1622 #else
1623 #error Method os::dll_load requires that one of following \
1624 is defined :_M_IA64,_M_AMD64 or _M_IX86
1625 #endif
1628 // Obtain a string for printf operation
1629 // lib_arch_str shall contain string what platform this .dll was built for
1630 // running_arch_str shall string contain what platform Hotspot was built for
1631 char *running_arch_str=NULL,*lib_arch_str=NULL;
1632 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1633 {
1634 if (lib_arch==arch_array[i].arch_code)
1635 lib_arch_str=arch_array[i].arch_name;
1636 if (running_arch==arch_array[i].arch_code)
1637 running_arch_str=arch_array[i].arch_name;
1638 }
1640 assert(running_arch_str,
1641 "Didn't find runing architecture code in arch_array");
1643 // If the architure is right
1644 // but some other error took place - report os::lasterror(...) msg
1645 if (lib_arch == running_arch)
1646 {
1647 return NULL;
1648 }
1650 if (lib_arch_str!=NULL)
1651 {
1652 ::_snprintf(ebuf, ebuflen-1,
1653 "Can't load %s-bit .dll on a %s-bit platform",
1654 lib_arch_str,running_arch_str);
1655 }
1656 else
1657 {
1658 // don't know what architecture this dll was build for
1659 ::_snprintf(ebuf, ebuflen-1,
1660 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1661 lib_arch,running_arch_str);
1662 }
1664 return NULL;
1665 }
1668 void os::print_dll_info(outputStream *st) {
1669 int pid = os::current_process_id();
1670 st->print_cr("Dynamic libraries:");
1671 enumerate_modules(pid, _print_module, (void *)st);
1672 }
1674 void os::print_os_info_brief(outputStream* st) {
1675 os::print_os_info(st);
1676 }
1678 void os::print_os_info(outputStream* st) {
1679 st->print("OS:");
1681 os::win32::print_windows_version(st);
1682 }
1684 void os::win32::print_windows_version(outputStream* st) {
1685 OSVERSIONINFOEX osvi;
1686 VS_FIXEDFILEINFO *file_info;
1687 TCHAR kernel32_path[MAX_PATH];
1688 UINT len, ret;
1690 // Use the GetVersionEx information to see if we're on a server or
1691 // workstation edition of Windows. Starting with Windows 8.1 we can't
1692 // trust the OS version information returned by this API.
1693 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1694 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1695 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1696 st->print_cr("Call to GetVersionEx failed");
1697 return;
1698 }
1699 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1701 // Get the full path to \Windows\System32\kernel32.dll and use that for
1702 // determining what version of Windows we're running on.
1703 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1704 ret = GetSystemDirectory(kernel32_path, len);
1705 if (ret == 0 || ret > len) {
1706 st->print_cr("Call to GetSystemDirectory failed");
1707 return;
1708 }
1709 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1711 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1712 if (version_size == 0) {
1713 st->print_cr("Call to GetFileVersionInfoSize failed");
1714 return;
1715 }
1717 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1718 if (version_info == NULL) {
1719 st->print_cr("Failed to allocate version_info");
1720 return;
1721 }
1723 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1724 os::free(version_info);
1725 st->print_cr("Call to GetFileVersionInfo failed");
1726 return;
1727 }
1729 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1730 os::free(version_info);
1731 st->print_cr("Call to VerQueryValue failed");
1732 return;
1733 }
1735 int major_version = HIWORD(file_info->dwProductVersionMS);
1736 int minor_version = LOWORD(file_info->dwProductVersionMS);
1737 int build_number = HIWORD(file_info->dwProductVersionLS);
1738 int build_minor = LOWORD(file_info->dwProductVersionLS);
1739 int os_vers = major_version * 1000 + minor_version;
1740 os::free(version_info);
1742 st->print(" Windows ");
1743 switch (os_vers) {
1745 case 6000:
1746 if (is_workstation) {
1747 st->print("Vista");
1748 } else {
1749 st->print("Server 2008");
1750 }
1751 break;
1753 case 6001:
1754 if (is_workstation) {
1755 st->print("7");
1756 } else {
1757 st->print("Server 2008 R2");
1758 }
1759 break;
1761 case 6002:
1762 if (is_workstation) {
1763 st->print("8");
1764 } else {
1765 st->print("Server 2012");
1766 }
1767 break;
1769 case 6003:
1770 if (is_workstation) {
1771 st->print("8.1");
1772 } else {
1773 st->print("Server 2012 R2");
1774 }
1775 break;
1777 case 6004:
1778 if (is_workstation) {
1779 st->print("10");
1780 } else {
1781 // distinguish Windows Server 2016 and 2019 by build number
1782 // Windows server 2019 GA 10/2018 build number is 17763
1783 if (build_number > 17762) {
1784 st->print("Server 2019");
1785 } else {
1786 st->print("Server 2016");
1787 }
1788 }
1789 break;
1791 default:
1792 // Unrecognized windows, print out its major and minor versions
1793 st->print("%d.%d", major_version, minor_version);
1794 break;
1795 }
1797 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1798 // find out whether we are running on 64 bit processor or not
1799 SYSTEM_INFO si;
1800 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1801 os::Kernel32Dll::GetNativeSystemInfo(&si);
1802 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1803 st->print(" , 64 bit");
1804 }
1806 st->print(" Build %d", build_number);
1807 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1808 st->cr();
1809 }
1811 void os::pd_print_cpu_info(outputStream* st) {
1812 // Nothing to do for now.
1813 }
1815 void os::print_memory_info(outputStream* st) {
1816 st->print("Memory:");
1817 st->print(" %dk page", os::vm_page_size()>>10);
1819 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1820 // value if total memory is larger than 4GB
1821 MEMORYSTATUSEX ms;
1822 ms.dwLength = sizeof(ms);
1823 GlobalMemoryStatusEx(&ms);
1825 st->print(", physical %uk", os::physical_memory() >> 10);
1826 st->print("(%uk free)", os::available_memory() >> 10);
1828 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1829 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1830 st->cr();
1831 }
1833 void os::print_siginfo(outputStream *st, void *siginfo) {
1834 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1835 st->print("siginfo:");
1836 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1838 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1839 er->NumberParameters >= 2) {
1840 switch (er->ExceptionInformation[0]) {
1841 case 0: st->print(", reading address"); break;
1842 case 1: st->print(", writing address"); break;
1843 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1844 er->ExceptionInformation[0]);
1845 }
1846 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1847 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1848 er->NumberParameters >= 2 && UseSharedSpaces) {
1849 FileMapInfo* mapinfo = FileMapInfo::current_info();
1850 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1851 st->print("\n\nError accessing class data sharing archive." \
1852 " Mapped file inaccessible during execution, " \
1853 " possible disk/network problem.");
1854 }
1855 } else {
1856 int num = er->NumberParameters;
1857 if (num > 0) {
1858 st->print(", ExceptionInformation=");
1859 for (int i = 0; i < num; i++) {
1860 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1861 }
1862 }
1863 }
1864 st->cr();
1865 }
1868 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1869 #if _MSC_VER >= 1900
1870 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1871 int result = ::vsnprintf(buf, len, fmt, args);
1872 // If an encoding error occurred (result < 0) then it's not clear
1873 // whether the buffer is NUL terminated, so ensure it is.
1874 if ((result < 0) && (len > 0)) {
1875 buf[len - 1] = '\0';
1876 }
1877 return result;
1878 #else
1879 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1880 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1881 // versions. However, when len == 0, avoid _vsnprintf too, and just
1882 // go straight to _vscprintf. The output is going to be truncated in
1883 // that case, except in the unusual case of empty output. More
1884 // importantly, the documentation for various versions of Visual Studio
1885 // are inconsistent about the behavior of _vsnprintf when len == 0,
1886 // including it possibly being an error.
1887 int result = -1;
1888 if (len > 0) {
1889 result = _vsnprintf(buf, len, fmt, args);
1890 // If output (including NUL terminator) is truncated, the buffer
1891 // won't be NUL terminated. Add the trailing NUL specified by C99.
1892 if ((result < 0) || (result >= (int) len)) {
1893 buf[len - 1] = '\0';
1894 }
1895 }
1896 if (result < 0) {
1897 result = _vscprintf(fmt, args);
1898 }
1899 return result;
1900 #endif // _MSC_VER dispatch
1901 }
1903 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1904 // do nothing
1905 }
1907 static char saved_jvm_path[MAX_PATH] = {0};
1909 // Find the full path to the current module, jvm.dll
1910 void os::jvm_path(char *buf, jint buflen) {
1911 // Error checking.
1912 if (buflen < MAX_PATH) {
1913 assert(false, "must use a large-enough buffer");
1914 buf[0] = '\0';
1915 return;
1916 }
1917 // Lazy resolve the path to current module.
1918 if (saved_jvm_path[0] != 0) {
1919 strcpy(buf, saved_jvm_path);
1920 return;
1921 }
1923 buf[0] = '\0';
1924 if (Arguments::created_by_gamma_launcher()) {
1925 // Support for the gamma launcher. Check for an
1926 // JAVA_HOME environment variable
1927 // and fix up the path so it looks like
1928 // libjvm.so is installed there (append a fake suffix
1929 // hotspot/libjvm.so).
1930 char* java_home_var = ::getenv("JAVA_HOME");
1931 if (java_home_var != NULL && java_home_var[0] != 0 &&
1932 strlen(java_home_var) < (size_t)buflen) {
1934 strncpy(buf, java_home_var, buflen);
1936 // determine if this is a legacy image or modules image
1937 // modules image doesn't have "jre" subdirectory
1938 size_t len = strlen(buf);
1939 char* jrebin_p = buf + len;
1940 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1941 if (0 != _access(buf, 0)) {
1942 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1943 }
1944 len = strlen(buf);
1945 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1946 }
1947 }
1949 if(buf[0] == '\0') {
1950 GetModuleFileName(vm_lib_handle, buf, buflen);
1951 }
1952 strncpy(saved_jvm_path, buf, MAX_PATH);
1953 }
1956 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1957 #ifndef _WIN64
1958 st->print("_");
1959 #endif
1960 }
1963 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1964 #ifndef _WIN64
1965 st->print("@%d", args_size * sizeof(int));
1966 #endif
1967 }
1969 // This method is a copy of JDK's sysGetLastErrorString
1970 // from src/windows/hpi/src/system_md.c
1972 size_t os::lasterror(char* buf, size_t len) {
1973 DWORD errval;
1975 if ((errval = GetLastError()) != 0) {
1976 // DOS error
1977 size_t n = (size_t)FormatMessage(
1978 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1979 NULL,
1980 errval,
1981 0,
1982 buf,
1983 (DWORD)len,
1984 NULL);
1985 if (n > 3) {
1986 // Drop final '.', CR, LF
1987 if (buf[n - 1] == '\n') n--;
1988 if (buf[n - 1] == '\r') n--;
1989 if (buf[n - 1] == '.') n--;
1990 buf[n] = '\0';
1991 }
1992 return n;
1993 }
1995 if (errno != 0) {
1996 // C runtime error that has no corresponding DOS error code
1997 const char* s = strerror(errno);
1998 size_t n = strlen(s);
1999 if (n >= len) n = len - 1;
2000 strncpy(buf, s, n);
2001 buf[n] = '\0';
2002 return n;
2003 }
2005 return 0;
2006 }
2008 int os::get_last_error() {
2009 DWORD error = GetLastError();
2010 if (error == 0)
2011 error = errno;
2012 return (int)error;
2013 }
2015 // sun.misc.Signal
2016 // NOTE that this is a workaround for an apparent kernel bug where if
2017 // a signal handler for SIGBREAK is installed then that signal handler
2018 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
2019 // See bug 4416763.
2020 static void (*sigbreakHandler)(int) = NULL;
2022 static void UserHandler(int sig, void *siginfo, void *context) {
2023 os::signal_notify(sig);
2024 // We need to reinstate the signal handler each time...
2025 os::signal(sig, (void*)UserHandler);
2026 }
2028 void* os::user_handler() {
2029 return (void*) UserHandler;
2030 }
2032 void* os::signal(int signal_number, void* handler) {
2033 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
2034 void (*oldHandler)(int) = sigbreakHandler;
2035 sigbreakHandler = (void (*)(int)) handler;
2036 return (void*) oldHandler;
2037 } else {
2038 return (void*)::signal(signal_number, (void (*)(int))handler);
2039 }
2040 }
2042 void os::signal_raise(int signal_number) {
2043 raise(signal_number);
2044 }
2046 // The Win32 C runtime library maps all console control events other than ^C
2047 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
2048 // logoff, and shutdown events. We therefore install our own console handler
2049 // that raises SIGTERM for the latter cases.
2050 //
2051 static BOOL WINAPI consoleHandler(DWORD event) {
2052 switch(event) {
2053 case CTRL_C_EVENT:
2054 if (is_error_reported()) {
2055 // Ctrl-C is pressed during error reporting, likely because the error
2056 // handler fails to abort. Let VM die immediately.
2057 os::die();
2058 }
2060 os::signal_raise(SIGINT);
2061 return TRUE;
2062 break;
2063 case CTRL_BREAK_EVENT:
2064 if (sigbreakHandler != NULL) {
2065 (*sigbreakHandler)(SIGBREAK);
2066 }
2067 return TRUE;
2068 break;
2069 case CTRL_LOGOFF_EVENT: {
2070 // Don't terminate JVM if it is running in a non-interactive session,
2071 // such as a service process.
2072 USEROBJECTFLAGS flags;
2073 HANDLE handle = GetProcessWindowStation();
2074 if (handle != NULL &&
2075 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2076 sizeof( USEROBJECTFLAGS), NULL)) {
2077 // If it is a non-interactive session, let next handler to deal
2078 // with it.
2079 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2080 return FALSE;
2081 }
2082 }
2083 }
2084 case CTRL_CLOSE_EVENT:
2085 case CTRL_SHUTDOWN_EVENT:
2086 os::signal_raise(SIGTERM);
2087 return TRUE;
2088 break;
2089 default:
2090 break;
2091 }
2092 return FALSE;
2093 }
2095 /*
2096 * The following code is moved from os.cpp for making this
2097 * code platform specific, which it is by its very nature.
2098 */
2100 // Return maximum OS signal used + 1 for internal use only
2101 // Used as exit signal for signal_thread
2102 int os::sigexitnum_pd(){
2103 return NSIG;
2104 }
2106 // a counter for each possible signal value, including signal_thread exit signal
2107 static volatile jint pending_signals[NSIG+1] = { 0 };
2108 static HANDLE sig_sem = NULL;
2110 void os::signal_init_pd() {
2111 // Initialize signal structures
2112 memset((void*)pending_signals, 0, sizeof(pending_signals));
2114 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2116 // Programs embedding the VM do not want it to attempt to receive
2117 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2118 // shutdown hooks mechanism introduced in 1.3. For example, when
2119 // the VM is run as part of a Windows NT service (i.e., a servlet
2120 // engine in a web server), the correct behavior is for any console
2121 // control handler to return FALSE, not TRUE, because the OS's
2122 // "final" handler for such events allows the process to continue if
2123 // it is a service (while terminating it if it is not a service).
2124 // To make this behavior uniform and the mechanism simpler, we
2125 // completely disable the VM's usage of these console events if -Xrs
2126 // (=ReduceSignalUsage) is specified. This means, for example, that
2127 // the CTRL-BREAK thread dump mechanism is also disabled in this
2128 // case. See bugs 4323062, 4345157, and related bugs.
2130 if (!ReduceSignalUsage) {
2131 // Add a CTRL-C handler
2132 SetConsoleCtrlHandler(consoleHandler, TRUE);
2133 }
2134 }
2136 void os::signal_notify(int signal_number) {
2137 BOOL ret;
2138 if (sig_sem != NULL) {
2139 Atomic::inc(&pending_signals[signal_number]);
2140 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2141 assert(ret != 0, "ReleaseSemaphore() failed");
2142 }
2143 }
2145 static int check_pending_signals(bool wait_for_signal) {
2146 DWORD ret;
2147 while (true) {
2148 for (int i = 0; i < NSIG + 1; i++) {
2149 jint n = pending_signals[i];
2150 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2151 return i;
2152 }
2153 }
2154 if (!wait_for_signal) {
2155 return -1;
2156 }
2158 JavaThread *thread = JavaThread::current();
2160 ThreadBlockInVM tbivm(thread);
2162 bool threadIsSuspended;
2163 do {
2164 thread->set_suspend_equivalent();
2165 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2166 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2167 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2169 // were we externally suspended while we were waiting?
2170 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2171 if (threadIsSuspended) {
2172 //
2173 // The semaphore has been incremented, but while we were waiting
2174 // another thread suspended us. We don't want to continue running
2175 // while suspended because that would surprise the thread that
2176 // suspended us.
2177 //
2178 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2179 assert(ret != 0, "ReleaseSemaphore() failed");
2181 thread->java_suspend_self();
2182 }
2183 } while (threadIsSuspended);
2184 }
2185 }
2187 int os::signal_lookup() {
2188 return check_pending_signals(false);
2189 }
2191 int os::signal_wait() {
2192 return check_pending_signals(true);
2193 }
2195 // Implicit OS exception handling
2197 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2198 JavaThread* thread = JavaThread::current();
2199 // Save pc in thread
2200 #ifdef _M_IA64
2201 // Do not blow up if no thread info available.
2202 if (thread) {
2203 // Saving PRECISE pc (with slot information) in thread.
2204 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2205 // Convert precise PC into "Unix" format
2206 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2207 thread->set_saved_exception_pc((address)precise_pc);
2208 }
2209 // Set pc to handler
2210 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2211 // Clear out psr.ri (= Restart Instruction) in order to continue
2212 // at the beginning of the target bundle.
2213 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2214 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2215 #else
2216 #ifdef _M_AMD64
2217 // Do not blow up if no thread info available.
2218 if (thread) {
2219 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2220 }
2221 // Set pc to handler
2222 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2223 #else
2224 // Do not blow up if no thread info available.
2225 if (thread) {
2226 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2227 }
2228 // Set pc to handler
2229 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2230 #endif
2231 #endif
2233 // Continue the execution
2234 return EXCEPTION_CONTINUE_EXECUTION;
2235 }
2238 // Used for PostMortemDump
2239 extern "C" void safepoints();
2240 extern "C" void find(int x);
2241 extern "C" void events();
2243 // According to Windows API documentation, an illegal instruction sequence should generate
2244 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2245 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2246 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2248 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2250 // From "Execution Protection in the Windows Operating System" draft 0.35
2251 // Once a system header becomes available, the "real" define should be
2252 // included or copied here.
2253 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2255 // Handle NAT Bit consumption on IA64.
2256 #ifdef _M_IA64
2257 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2258 #endif
2260 // Windows Vista/2008 heap corruption check
2261 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2263 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2264 // C++ compiler contain this error code. Because this is a compiler-generated
2265 // error, the code is not listed in the Win32 API header files.
2266 // The code is actually a cryptic mnemonic device, with the initial "E"
2267 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2268 // ASCII values of "msc".
2270 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2272 #define def_excpt(val) { #val, (val) }
2274 static const struct { char* name; uint number; } exceptlabels[] = {
2275 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2276 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2277 def_excpt(EXCEPTION_BREAKPOINT),
2278 def_excpt(EXCEPTION_SINGLE_STEP),
2279 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2280 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2281 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2282 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2283 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2284 def_excpt(EXCEPTION_FLT_OVERFLOW),
2285 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2286 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2287 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2288 def_excpt(EXCEPTION_INT_OVERFLOW),
2289 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2290 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2291 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2292 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2293 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2294 def_excpt(EXCEPTION_STACK_OVERFLOW),
2295 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2296 def_excpt(EXCEPTION_GUARD_PAGE),
2297 def_excpt(EXCEPTION_INVALID_HANDLE),
2298 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2299 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2300 #ifdef _M_IA64
2301 , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION)
2302 #endif
2303 };
2305 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2306 uint code = static_cast<uint>(exception_code);
2307 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2308 if (exceptlabels[i].number == code) {
2309 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2310 return buf;
2311 }
2312 }
2314 return NULL;
2315 }
2317 //-----------------------------------------------------------------------------
2318 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2319 // handle exception caused by idiv; should only happen for -MinInt/-1
2320 // (division by zero is handled explicitly)
2321 #ifdef _M_IA64
2322 assert(0, "Fix Handle_IDiv_Exception");
2323 #else
2324 #ifdef _M_AMD64
2325 PCONTEXT ctx = exceptionInfo->ContextRecord;
2326 address pc = (address)ctx->Rip;
2327 assert(pc[0] == 0xF7, "not an idiv opcode");
2328 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2329 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2330 // set correct result values and continue after idiv instruction
2331 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2332 ctx->Rax = (DWORD64)min_jint; // result
2333 ctx->Rdx = (DWORD64)0; // remainder
2334 // Continue the execution
2335 #else
2336 PCONTEXT ctx = exceptionInfo->ContextRecord;
2337 address pc = (address)ctx->Eip;
2338 assert(pc[0] == 0xF7, "not an idiv opcode");
2339 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2340 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2341 // set correct result values and continue after idiv instruction
2342 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2343 ctx->Eax = (DWORD)min_jint; // result
2344 ctx->Edx = (DWORD)0; // remainder
2345 // Continue the execution
2346 #endif
2347 #endif
2348 return EXCEPTION_CONTINUE_EXECUTION;
2349 }
2351 #ifndef _WIN64
2352 //-----------------------------------------------------------------------------
2353 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2354 // handle exception caused by native method modifying control word
2355 PCONTEXT ctx = exceptionInfo->ContextRecord;
2356 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2358 switch (exception_code) {
2359 case EXCEPTION_FLT_DENORMAL_OPERAND:
2360 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2361 case EXCEPTION_FLT_INEXACT_RESULT:
2362 case EXCEPTION_FLT_INVALID_OPERATION:
2363 case EXCEPTION_FLT_OVERFLOW:
2364 case EXCEPTION_FLT_STACK_CHECK:
2365 case EXCEPTION_FLT_UNDERFLOW:
2366 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2367 if (fp_control_word != ctx->FloatSave.ControlWord) {
2368 // Restore FPCW and mask out FLT exceptions
2369 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2370 // Mask out pending FLT exceptions
2371 ctx->FloatSave.StatusWord &= 0xffffff00;
2372 return EXCEPTION_CONTINUE_EXECUTION;
2373 }
2374 }
2376 if (prev_uef_handler != NULL) {
2377 // We didn't handle this exception so pass it to the previous
2378 // UnhandledExceptionFilter.
2379 return (prev_uef_handler)(exceptionInfo);
2380 }
2382 return EXCEPTION_CONTINUE_SEARCH;
2383 }
2384 #else //_WIN64
2385 /*
2386 On Windows, the mxcsr control bits are non-volatile across calls
2387 See also CR 6192333
2388 If EXCEPTION_FLT_* happened after some native method modified
2389 mxcsr - it is not a jvm fault.
2390 However should we decide to restore of mxcsr after a faulty
2391 native method we can uncomment following code
2392 jint MxCsr = INITIAL_MXCSR;
2393 // we can't use StubRoutines::addr_mxcsr_std()
2394 // because in Win64 mxcsr is not saved there
2395 if (MxCsr != ctx->MxCsr) {
2396 ctx->MxCsr = MxCsr;
2397 return EXCEPTION_CONTINUE_EXECUTION;
2398 }
2400 */
2401 #endif // _WIN64
2404 static inline void report_error(Thread* t, DWORD exception_code,
2405 address addr, void* siginfo, void* context) {
2406 VMError err(t, exception_code, addr, siginfo, context);
2407 err.report_and_die();
2409 // If UseOsErrorReporting, this will return here and save the error file
2410 // somewhere where we can find it in the minidump.
2411 }
2413 //-----------------------------------------------------------------------------
2414 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2415 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2416 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2417 #ifdef _M_IA64
2418 // On Itanium, we need the "precise pc", which has the slot number coded
2419 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2420 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2421 // Convert the pc to "Unix format", which has the slot number coded
2422 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2423 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2424 // information is saved in the Unix format.
2425 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2426 #else
2427 #ifdef _M_AMD64
2428 address pc = (address) exceptionInfo->ContextRecord->Rip;
2429 #else
2430 address pc = (address) exceptionInfo->ContextRecord->Eip;
2431 #endif
2432 #endif
2433 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2435 // Handle SafeFetch32 and SafeFetchN exceptions.
2436 if (StubRoutines::is_safefetch_fault(pc)) {
2437 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2438 }
2440 #ifndef _WIN64
2441 // Execution protection violation - win32 running on AMD64 only
2442 // Handled first to avoid misdiagnosis as a "normal" access violation;
2443 // This is safe to do because we have a new/unique ExceptionInformation
2444 // code for this condition.
2445 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2446 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2447 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2448 address addr = (address) exceptionRecord->ExceptionInformation[1];
2450 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2451 int page_size = os::vm_page_size();
2453 // Make sure the pc and the faulting address are sane.
2454 //
2455 // If an instruction spans a page boundary, and the page containing
2456 // the beginning of the instruction is executable but the following
2457 // page is not, the pc and the faulting address might be slightly
2458 // different - we still want to unguard the 2nd page in this case.
2459 //
2460 // 15 bytes seems to be a (very) safe value for max instruction size.
2461 bool pc_is_near_addr =
2462 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2463 bool instr_spans_page_boundary =
2464 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2465 (intptr_t) page_size) > 0);
2467 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2468 static volatile address last_addr =
2469 (address) os::non_memory_address_word();
2471 // In conservative mode, don't unguard unless the address is in the VM
2472 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2473 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2475 // Set memory to RWX and retry
2476 address page_start =
2477 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2478 bool res = os::protect_memory((char*) page_start, page_size,
2479 os::MEM_PROT_RWX);
2481 if (PrintMiscellaneous && Verbose) {
2482 char buf[256];
2483 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2484 "at " INTPTR_FORMAT
2485 ", unguarding " INTPTR_FORMAT ": %s", addr,
2486 page_start, (res ? "success" : strerror(errno)));
2487 tty->print_raw_cr(buf);
2488 }
2490 // Set last_addr so if we fault again at the same address, we don't
2491 // end up in an endless loop.
2492 //
2493 // There are two potential complications here. Two threads trapping
2494 // at the same address at the same time could cause one of the
2495 // threads to think it already unguarded, and abort the VM. Likely
2496 // very rare.
2497 //
2498 // The other race involves two threads alternately trapping at
2499 // different addresses and failing to unguard the page, resulting in
2500 // an endless loop. This condition is probably even more unlikely
2501 // than the first.
2502 //
2503 // Although both cases could be avoided by using locks or thread
2504 // local last_addr, these solutions are unnecessary complication:
2505 // this handler is a best-effort safety net, not a complete solution.
2506 // It is disabled by default and should only be used as a workaround
2507 // in case we missed any no-execute-unsafe VM code.
2509 last_addr = addr;
2511 return EXCEPTION_CONTINUE_EXECUTION;
2512 }
2513 }
2515 // Last unguard failed or not unguarding
2516 tty->print_raw_cr("Execution protection violation");
2517 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2518 exceptionInfo->ContextRecord);
2519 return EXCEPTION_CONTINUE_SEARCH;
2520 }
2521 }
2522 #endif // _WIN64
2524 // Check to see if we caught the safepoint code in the
2525 // process of write protecting the memory serialization page.
2526 // It write enables the page immediately after protecting it
2527 // so just return.
2528 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2529 JavaThread* thread = (JavaThread*) t;
2530 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2531 address addr = (address) exceptionRecord->ExceptionInformation[1];
2532 if ( os::is_memory_serialize_page(thread, addr) ) {
2533 // Block current thread until the memory serialize page permission restored.
2534 os::block_on_serialize_page_trap();
2535 return EXCEPTION_CONTINUE_EXECUTION;
2536 }
2537 }
2539 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2540 VM_Version::is_cpuinfo_segv_addr(pc)) {
2541 // Verify that OS save/restore AVX registers.
2542 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2543 }
2545 if (t != NULL && t->is_Java_thread()) {
2546 JavaThread* thread = (JavaThread*) t;
2547 bool in_java = thread->thread_state() == _thread_in_Java;
2549 // Handle potential stack overflows up front.
2550 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2551 if (os::uses_stack_guard_pages()) {
2552 #ifdef _M_IA64
2553 // Use guard page for register stack.
2554 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2555 address addr = (address) exceptionRecord->ExceptionInformation[1];
2556 // Check for a register stack overflow on Itanium
2557 if (thread->addr_inside_register_stack_red_zone(addr)) {
2558 // Fatal red zone violation happens if the Java program
2559 // catches a StackOverflow error and does so much processing
2560 // that it runs beyond the unprotected yellow guard zone. As
2561 // a result, we are out of here.
2562 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2563 } else if(thread->addr_inside_register_stack(addr)) {
2564 // Disable the yellow zone which sets the state that
2565 // we've got a stack overflow problem.
2566 if (thread->stack_yellow_zone_enabled()) {
2567 thread->disable_stack_yellow_zone();
2568 }
2569 // Give us some room to process the exception.
2570 thread->disable_register_stack_guard();
2571 // Tracing with +Verbose.
2572 if (Verbose) {
2573 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2574 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2575 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2576 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2577 thread->register_stack_base(),
2578 thread->register_stack_base() + thread->stack_size());
2579 }
2581 // Reguard the permanent register stack red zone just to be sure.
2582 // We saw Windows silently disabling this without telling us.
2583 thread->enable_register_stack_red_zone();
2585 return Handle_Exception(exceptionInfo,
2586 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2587 }
2588 #endif
2589 if (thread->stack_yellow_zone_enabled()) {
2590 // Yellow zone violation. The o/s has unprotected the first yellow
2591 // zone page for us. Note: must call disable_stack_yellow_zone to
2592 // update the enabled status, even if the zone contains only one page.
2593 thread->disable_stack_yellow_zone();
2594 // If not in java code, return and hope for the best.
2595 return in_java ? Handle_Exception(exceptionInfo,
2596 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2597 : EXCEPTION_CONTINUE_EXECUTION;
2598 } else {
2599 // Fatal red zone violation.
2600 thread->disable_stack_red_zone();
2601 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2602 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2603 exceptionInfo->ContextRecord);
2604 return EXCEPTION_CONTINUE_SEARCH;
2605 }
2606 } else if (in_java) {
2607 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2608 // a one-time-only guard page, which it has released to us. The next
2609 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2610 return Handle_Exception(exceptionInfo,
2611 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2612 } else {
2613 // Can only return and hope for the best. Further stack growth will
2614 // result in an ACCESS_VIOLATION.
2615 return EXCEPTION_CONTINUE_EXECUTION;
2616 }
2617 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2618 // Either stack overflow or null pointer exception.
2619 if (in_java) {
2620 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2621 address addr = (address) exceptionRecord->ExceptionInformation[1];
2622 address stack_end = thread->stack_base() - thread->stack_size();
2623 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2624 // Stack overflow.
2625 assert(!os::uses_stack_guard_pages(),
2626 "should be caught by red zone code above.");
2627 return Handle_Exception(exceptionInfo,
2628 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2629 }
2630 //
2631 // Check for safepoint polling and implicit null
2632 // We only expect null pointers in the stubs (vtable)
2633 // the rest are checked explicitly now.
2634 //
2635 CodeBlob* cb = CodeCache::find_blob(pc);
2636 if (cb != NULL) {
2637 if (os::is_poll_address(addr)) {
2638 address stub = SharedRuntime::get_poll_stub(pc);
2639 return Handle_Exception(exceptionInfo, stub);
2640 }
2641 }
2642 {
2643 #ifdef _WIN64
2644 //
2645 // If it's a legal stack address map the entire region in
2646 //
2647 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2648 address addr = (address) exceptionRecord->ExceptionInformation[1];
2649 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2650 addr = (address)((uintptr_t)addr &
2651 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2652 os::commit_memory((char *)addr, thread->stack_base() - addr,
2653 !ExecMem);
2654 return EXCEPTION_CONTINUE_EXECUTION;
2655 }
2656 else
2657 #endif
2658 {
2659 // Null pointer exception.
2660 #ifdef _M_IA64
2661 // Process implicit null checks in compiled code. Note: Implicit null checks
2662 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2663 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2664 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2665 // Handle implicit null check in UEP method entry
2666 if (cb && (cb->is_frame_complete_at(pc) ||
2667 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2668 if (Verbose) {
2669 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2670 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2671 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2672 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2673 *(bundle_start + 1), *bundle_start);
2674 }
2675 return Handle_Exception(exceptionInfo,
2676 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2677 }
2678 }
2680 // Implicit null checks were processed above. Hence, we should not reach
2681 // here in the usual case => die!
2682 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2683 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2684 exceptionInfo->ContextRecord);
2685 return EXCEPTION_CONTINUE_SEARCH;
2687 #else // !IA64
2689 // Windows 98 reports faulting addresses incorrectly
2690 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2691 !os::win32::is_nt()) {
2692 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2693 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2694 }
2695 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2696 exceptionInfo->ContextRecord);
2697 return EXCEPTION_CONTINUE_SEARCH;
2698 #endif
2699 }
2700 }
2701 }
2703 #ifdef _WIN64
2704 // Special care for fast JNI field accessors.
2705 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2706 // in and the heap gets shrunk before the field access.
2707 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2708 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2709 if (addr != (address)-1) {
2710 return Handle_Exception(exceptionInfo, addr);
2711 }
2712 }
2713 #endif
2715 // Stack overflow or null pointer exception in native code.
2716 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2717 exceptionInfo->ContextRecord);
2718 return EXCEPTION_CONTINUE_SEARCH;
2719 } // /EXCEPTION_ACCESS_VIOLATION
2720 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2721 #if defined _M_IA64
2722 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2723 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2724 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2726 // Compiled method patched to be non entrant? Following conditions must apply:
2727 // 1. must be first instruction in bundle
2728 // 2. must be a break instruction with appropriate code
2729 if((((uint64_t) pc & 0x0F) == 0) &&
2730 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2731 return Handle_Exception(exceptionInfo,
2732 (address)SharedRuntime::get_handle_wrong_method_stub());
2733 }
2734 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2735 #endif
2738 if (in_java) {
2739 switch (exception_code) {
2740 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2741 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2743 case EXCEPTION_INT_OVERFLOW:
2744 return Handle_IDiv_Exception(exceptionInfo);
2746 } // switch
2747 }
2748 #ifndef _WIN64
2749 if (((thread->thread_state() == _thread_in_Java) ||
2750 (thread->thread_state() == _thread_in_native)) &&
2751 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2752 {
2753 LONG result=Handle_FLT_Exception(exceptionInfo);
2754 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2755 }
2756 #endif //_WIN64
2757 }
2759 if (exception_code != EXCEPTION_BREAKPOINT) {
2760 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2761 exceptionInfo->ContextRecord);
2762 }
2763 return EXCEPTION_CONTINUE_SEARCH;
2764 }
2766 #ifndef _WIN64
2767 // Special care for fast JNI accessors.
2768 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2769 // the heap gets shrunk before the field access.
2770 // Need to install our own structured exception handler since native code may
2771 // install its own.
2772 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2773 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2774 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2775 address pc = (address) exceptionInfo->ContextRecord->Eip;
2776 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2777 if (addr != (address)-1) {
2778 return Handle_Exception(exceptionInfo, addr);
2779 }
2780 }
2781 return EXCEPTION_CONTINUE_SEARCH;
2782 }
2784 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2785 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2786 __try { \
2787 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2788 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2789 } \
2790 return 0; \
2791 }
2793 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2794 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2795 DEFINE_FAST_GETFIELD(jchar, char, Char)
2796 DEFINE_FAST_GETFIELD(jshort, short, Short)
2797 DEFINE_FAST_GETFIELD(jint, int, Int)
2798 DEFINE_FAST_GETFIELD(jlong, long, Long)
2799 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2800 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2802 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2803 switch (type) {
2804 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2805 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2806 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2807 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2808 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2809 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2810 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2811 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2812 default: ShouldNotReachHere();
2813 }
2814 return (address)-1;
2815 }
2816 #endif
2818 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2819 // Install a win32 structured exception handler around the test
2820 // function call so the VM can generate an error dump if needed.
2821 __try {
2822 (*funcPtr)();
2823 } __except(topLevelExceptionFilter(
2824 (_EXCEPTION_POINTERS*)_exception_info())) {
2825 // Nothing to do.
2826 }
2827 }
2829 // Virtual Memory
2831 int os::vm_page_size() { return os::win32::vm_page_size(); }
2832 int os::vm_allocation_granularity() {
2833 return os::win32::vm_allocation_granularity();
2834 }
2836 // Windows large page support is available on Windows 2003. In order to use
2837 // large page memory, the administrator must first assign additional privilege
2838 // to the user:
2839 // + select Control Panel -> Administrative Tools -> Local Security Policy
2840 // + select Local Policies -> User Rights Assignment
2841 // + double click "Lock pages in memory", add users and/or groups
2842 // + reboot
2843 // Note the above steps are needed for administrator as well, as administrators
2844 // by default do not have the privilege to lock pages in memory.
2845 //
2846 // Note about Windows 2003: although the API supports committing large page
2847 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2848 // scenario, I found through experiment it only uses large page if the entire
2849 // memory region is reserved and committed in a single VirtualAlloc() call.
2850 // This makes Windows large page support more or less like Solaris ISM, in
2851 // that the entire heap must be committed upfront. This probably will change
2852 // in the future, if so the code below needs to be revisited.
2854 #ifndef MEM_LARGE_PAGES
2855 #define MEM_LARGE_PAGES 0x20000000
2856 #endif
2858 static HANDLE _hProcess;
2859 static HANDLE _hToken;
2861 // Container for NUMA node list info
2862 class NUMANodeListHolder {
2863 private:
2864 int *_numa_used_node_list; // allocated below
2865 int _numa_used_node_count;
2867 void free_node_list() {
2868 if (_numa_used_node_list != NULL) {
2869 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2870 }
2871 }
2873 public:
2874 NUMANodeListHolder() {
2875 _numa_used_node_count = 0;
2876 _numa_used_node_list = NULL;
2877 // do rest of initialization in build routine (after function pointers are set up)
2878 }
2880 ~NUMANodeListHolder() {
2881 free_node_list();
2882 }
2884 bool build() {
2885 DWORD_PTR proc_aff_mask;
2886 DWORD_PTR sys_aff_mask;
2887 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2888 ULONG highest_node_number;
2889 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2890 free_node_list();
2891 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2892 for (unsigned int i = 0; i <= highest_node_number; i++) {
2893 ULONGLONG proc_mask_numa_node;
2894 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2895 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2896 _numa_used_node_list[_numa_used_node_count++] = i;
2897 }
2898 }
2899 return (_numa_used_node_count > 1);
2900 }
2902 int get_count() {return _numa_used_node_count;}
2903 int get_node_list_entry(int n) {
2904 // for indexes out of range, returns -1
2905 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2906 }
2908 } numa_node_list_holder;
2912 static size_t _large_page_size = 0;
2914 static bool resolve_functions_for_large_page_init() {
2915 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2916 os::Advapi32Dll::AdvapiAvailable();
2917 }
2919 static bool request_lock_memory_privilege() {
2920 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2921 os::current_process_id());
2923 LUID luid;
2924 if (_hProcess != NULL &&
2925 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2926 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2928 TOKEN_PRIVILEGES tp;
2929 tp.PrivilegeCount = 1;
2930 tp.Privileges[0].Luid = luid;
2931 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2933 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2934 // privilege. Check GetLastError() too. See MSDN document.
2935 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2936 (GetLastError() == ERROR_SUCCESS)) {
2937 return true;
2938 }
2939 }
2941 return false;
2942 }
2944 static void cleanup_after_large_page_init() {
2945 if (_hProcess) CloseHandle(_hProcess);
2946 _hProcess = NULL;
2947 if (_hToken) CloseHandle(_hToken);
2948 _hToken = NULL;
2949 }
2951 static bool numa_interleaving_init() {
2952 bool success = false;
2953 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2955 // print a warning if UseNUMAInterleaving flag is specified on command line
2956 bool warn_on_failure = use_numa_interleaving_specified;
2957 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2959 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2960 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2961 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2963 if (os::Kernel32Dll::NumaCallsAvailable()) {
2964 if (numa_node_list_holder.build()) {
2965 if (PrintMiscellaneous && Verbose) {
2966 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2967 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2968 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2969 }
2970 tty->print("\n");
2971 }
2972 success = true;
2973 } else {
2974 WARN("Process does not cover multiple NUMA nodes.");
2975 }
2976 } else {
2977 WARN("NUMA Interleaving is not supported by the operating system.");
2978 }
2979 if (!success) {
2980 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2981 }
2982 return success;
2983 #undef WARN
2984 }
2986 // this routine is used whenever we need to reserve a contiguous VA range
2987 // but we need to make separate VirtualAlloc calls for each piece of the range
2988 // Reasons for doing this:
2989 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2990 // * UseNUMAInterleaving requires a separate node for each piece
2991 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2992 bool should_inject_error=false) {
2993 char * p_buf;
2994 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2995 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2996 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2998 // first reserve enough address space in advance since we want to be
2999 // able to break a single contiguous virtual address range into multiple
3000 // large page commits but WS2003 does not allow reserving large page space
3001 // so we just use 4K pages for reserve, this gives us a legal contiguous
3002 // address space. then we will deallocate that reservation, and re alloc
3003 // using large pages
3004 const size_t size_of_reserve = bytes + chunk_size;
3005 if (bytes > size_of_reserve) {
3006 // Overflowed.
3007 return NULL;
3008 }
3009 p_buf = (char *) VirtualAlloc(addr,
3010 size_of_reserve, // size of Reserve
3011 MEM_RESERVE,
3012 PAGE_READWRITE);
3013 // If reservation failed, return NULL
3014 if (p_buf == NULL) return NULL;
3015 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
3016 os::release_memory(p_buf, bytes + chunk_size);
3018 // we still need to round up to a page boundary (in case we are using large pages)
3019 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
3020 // instead we handle this in the bytes_to_rq computation below
3021 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
3023 // now go through and allocate one chunk at a time until all bytes are
3024 // allocated
3025 size_t bytes_remaining = bytes;
3026 // An overflow of align_size_up() would have been caught above
3027 // in the calculation of size_of_reserve.
3028 char * next_alloc_addr = p_buf;
3029 HANDLE hProc = GetCurrentProcess();
3031 #ifdef ASSERT
3032 // Variable for the failure injection
3033 long ran_num = os::random();
3034 size_t fail_after = ran_num % bytes;
3035 #endif
3037 int count=0;
3038 while (bytes_remaining) {
3039 // select bytes_to_rq to get to the next chunk_size boundary
3041 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
3042 // Note allocate and commit
3043 char * p_new;
3045 #ifdef ASSERT
3046 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
3047 #else
3048 const bool inject_error_now = false;
3049 #endif
3051 if (inject_error_now) {
3052 p_new = NULL;
3053 } else {
3054 if (!UseNUMAInterleaving) {
3055 p_new = (char *) VirtualAlloc(next_alloc_addr,
3056 bytes_to_rq,
3057 flags,
3058 prot);
3059 } else {
3060 // get the next node to use from the used_node_list
3061 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3062 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3063 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3064 next_alloc_addr,
3065 bytes_to_rq,
3066 flags,
3067 prot,
3068 node);
3069 }
3070 }
3072 if (p_new == NULL) {
3073 // Free any allocated pages
3074 if (next_alloc_addr > p_buf) {
3075 // Some memory was committed so release it.
3076 size_t bytes_to_release = bytes - bytes_remaining;
3077 // NMT has yet to record any individual blocks, so it
3078 // need to create a dummy 'reserve' record to match
3079 // the release.
3080 MemTracker::record_virtual_memory_reserve((address)p_buf,
3081 bytes_to_release, CALLER_PC);
3082 os::release_memory(p_buf, bytes_to_release);
3083 }
3084 #ifdef ASSERT
3085 if (should_inject_error) {
3086 if (TracePageSizes && Verbose) {
3087 tty->print_cr("Reserving pages individually failed.");
3088 }
3089 }
3090 #endif
3091 return NULL;
3092 }
3094 bytes_remaining -= bytes_to_rq;
3095 next_alloc_addr += bytes_to_rq;
3096 count++;
3097 }
3098 // Although the memory is allocated individually, it is returned as one.
3099 // NMT records it as one block.
3100 if ((flags & MEM_COMMIT) != 0) {
3101 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3102 } else {
3103 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3104 }
3106 // made it this far, success
3107 return p_buf;
3108 }
3112 void os::large_page_init() {
3113 if (!UseLargePages) return;
3115 // print a warning if any large page related flag is specified on command line
3116 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3117 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3118 bool success = false;
3120 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3121 if (resolve_functions_for_large_page_init()) {
3122 if (request_lock_memory_privilege()) {
3123 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3124 if (s) {
3125 #if defined(IA32) || defined(AMD64)
3126 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3127 WARN("JVM cannot use large pages bigger than 4mb.");
3128 } else {
3129 #endif
3130 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3131 _large_page_size = LargePageSizeInBytes;
3132 } else {
3133 _large_page_size = s;
3134 }
3135 success = true;
3136 #if defined(IA32) || defined(AMD64)
3137 }
3138 #endif
3139 } else {
3140 WARN("Large page is not supported by the processor.");
3141 }
3142 } else {
3143 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3144 }
3145 } else {
3146 WARN("Large page is not supported by the operating system.");
3147 }
3148 #undef WARN
3150 const size_t default_page_size = (size_t) vm_page_size();
3151 if (success && _large_page_size > default_page_size) {
3152 _page_sizes[0] = _large_page_size;
3153 _page_sizes[1] = default_page_size;
3154 _page_sizes[2] = 0;
3155 }
3157 cleanup_after_large_page_init();
3158 UseLargePages = success;
3159 }
3161 // On win32, one cannot release just a part of reserved memory, it's an
3162 // all or nothing deal. When we split a reservation, we must break the
3163 // reservation into two reservations.
3164 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3165 bool realloc) {
3166 if (size > 0) {
3167 release_memory(base, size);
3168 if (realloc) {
3169 reserve_memory(split, base);
3170 }
3171 if (size != split) {
3172 reserve_memory(size - split, base + split);
3173 }
3174 }
3175 }
3177 // Multiple threads can race in this code but it's not possible to unmap small sections of
3178 // virtual space to get requested alignment, like posix-like os's.
3179 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3180 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3181 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3182 "Alignment must be a multiple of allocation granularity (page size)");
3183 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3185 size_t extra_size = size + alignment;
3186 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3188 char* aligned_base = NULL;
3190 do {
3191 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3192 if (extra_base == NULL) {
3193 return NULL;
3194 }
3195 // Do manual alignment
3196 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3198 os::release_memory(extra_base, extra_size);
3200 aligned_base = os::reserve_memory(size, aligned_base);
3202 } while (aligned_base == NULL);
3204 return aligned_base;
3205 }
3207 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3208 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3209 "reserve alignment");
3210 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3211 char* res;
3212 // note that if UseLargePages is on, all the areas that require interleaving
3213 // will go thru reserve_memory_special rather than thru here.
3214 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3215 if (!use_individual) {
3216 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3217 } else {
3218 elapsedTimer reserveTimer;
3219 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3220 // in numa interleaving, we have to allocate pages individually
3221 // (well really chunks of NUMAInterleaveGranularity size)
3222 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3223 if (res == NULL) {
3224 warning("NUMA page allocation failed");
3225 }
3226 if( Verbose && PrintMiscellaneous ) {
3227 reserveTimer.stop();
3228 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3229 reserveTimer.milliseconds(), reserveTimer.ticks());
3230 }
3231 }
3232 assert(res == NULL || addr == NULL || addr == res,
3233 "Unexpected address from reserve.");
3235 return res;
3236 }
3238 // Reserve memory at an arbitrary address, only if that area is
3239 // available (and not reserved for something else).
3240 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3241 // Windows os::reserve_memory() fails of the requested address range is
3242 // not avilable.
3243 return reserve_memory(bytes, requested_addr);
3244 }
3246 size_t os::large_page_size() {
3247 return _large_page_size;
3248 }
3250 bool os::can_commit_large_page_memory() {
3251 // Windows only uses large page memory when the entire region is reserved
3252 // and committed in a single VirtualAlloc() call. This may change in the
3253 // future, but with Windows 2003 it's not possible to commit on demand.
3254 return false;
3255 }
3257 bool os::can_execute_large_page_memory() {
3258 return true;
3259 }
3261 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3262 assert(UseLargePages, "only for large pages");
3264 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3265 return NULL; // Fallback to small pages.
3266 }
3268 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3269 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3271 // with large pages, there are two cases where we need to use Individual Allocation
3272 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3273 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3274 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3275 if (TracePageSizes && Verbose) {
3276 tty->print_cr("Reserving large pages individually.");
3277 }
3278 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3279 if (p_buf == NULL) {
3280 // give an appropriate warning message
3281 if (UseNUMAInterleaving) {
3282 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3283 }
3284 if (UseLargePagesIndividualAllocation) {
3285 warning("Individually allocated large pages failed, "
3286 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3287 }
3288 return NULL;
3289 }
3291 return p_buf;
3293 } else {
3294 if (TracePageSizes && Verbose) {
3295 tty->print_cr("Reserving large pages in a single large chunk.");
3296 }
3297 // normal policy just allocate it all at once
3298 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3299 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3300 if (res != NULL) {
3301 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3302 }
3304 return res;
3305 }
3306 }
3308 bool os::release_memory_special(char* base, size_t bytes) {
3309 assert(base != NULL, "Sanity check");
3310 return release_memory(base, bytes);
3311 }
3313 void os::print_statistics() {
3314 }
3316 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3317 int err = os::get_last_error();
3318 char buf[256];
3319 size_t buf_len = os::lasterror(buf, sizeof(buf));
3320 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3321 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3322 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3323 }
3325 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3326 if (bytes == 0) {
3327 // Don't bother the OS with noops.
3328 return true;
3329 }
3330 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3331 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3332 // Don't attempt to print anything if the OS call fails. We're
3333 // probably low on resources, so the print itself may cause crashes.
3335 // unless we have NUMAInterleaving enabled, the range of a commit
3336 // is always within a reserve covered by a single VirtualAlloc
3337 // in that case we can just do a single commit for the requested size
3338 if (!UseNUMAInterleaving) {
3339 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3340 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3341 return false;
3342 }
3343 if (exec) {
3344 DWORD oldprot;
3345 // Windows doc says to use VirtualProtect to get execute permissions
3346 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3347 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3348 return false;
3349 }
3350 }
3351 return true;
3352 } else {
3354 // when NUMAInterleaving is enabled, the commit might cover a range that
3355 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3356 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3357 // returns represents the number of bytes that can be committed in one step.
3358 size_t bytes_remaining = bytes;
3359 char * next_alloc_addr = addr;
3360 while (bytes_remaining > 0) {
3361 MEMORY_BASIC_INFORMATION alloc_info;
3362 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3363 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3364 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3365 PAGE_READWRITE) == NULL) {
3366 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3367 exec);)
3368 return false;
3369 }
3370 if (exec) {
3371 DWORD oldprot;
3372 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3373 PAGE_EXECUTE_READWRITE, &oldprot)) {
3374 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3375 exec);)
3376 return false;
3377 }
3378 }
3379 bytes_remaining -= bytes_to_rq;
3380 next_alloc_addr += bytes_to_rq;
3381 }
3382 }
3383 // if we made it this far, return true
3384 return true;
3385 }
3387 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3388 bool exec) {
3389 // alignment_hint is ignored on this OS
3390 return pd_commit_memory(addr, size, exec);
3391 }
3393 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3394 const char* mesg) {
3395 assert(mesg != NULL, "mesg must be specified");
3396 if (!pd_commit_memory(addr, size, exec)) {
3397 warn_fail_commit_memory(addr, size, exec);
3398 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3399 }
3400 }
3402 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3403 size_t alignment_hint, bool exec,
3404 const char* mesg) {
3405 // alignment_hint is ignored on this OS
3406 pd_commit_memory_or_exit(addr, size, exec, mesg);
3407 }
3409 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3410 if (bytes == 0) {
3411 // Don't bother the OS with noops.
3412 return true;
3413 }
3414 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3415 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3416 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3417 }
3419 bool os::pd_release_memory(char* addr, size_t bytes) {
3420 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3421 }
3423 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3424 return os::commit_memory(addr, size, !ExecMem);
3425 }
3427 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3428 return os::uncommit_memory(addr, size);
3429 }
3431 // Set protections specified
3432 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3433 bool is_committed) {
3434 unsigned int p = 0;
3435 switch (prot) {
3436 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3437 case MEM_PROT_READ: p = PAGE_READONLY; break;
3438 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3439 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3440 default:
3441 ShouldNotReachHere();
3442 }
3444 DWORD old_status;
3446 // Strange enough, but on Win32 one can change protection only for committed
3447 // memory, not a big deal anyway, as bytes less or equal than 64K
3448 if (!is_committed) {
3449 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3450 "cannot commit protection page");
3451 }
3452 // One cannot use os::guard_memory() here, as on Win32 guard page
3453 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3454 //
3455 // Pages in the region become guard pages. Any attempt to access a guard page
3456 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3457 // the guard page status. Guard pages thus act as a one-time access alarm.
3458 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3459 }
3461 bool os::guard_memory(char* addr, size_t bytes) {
3462 DWORD old_status;
3463 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3464 }
3466 bool os::unguard_memory(char* addr, size_t bytes) {
3467 DWORD old_status;
3468 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3469 }
3471 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3472 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3473 void os::numa_make_global(char *addr, size_t bytes) { }
3474 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3475 bool os::numa_topology_changed() { return false; }
3476 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3477 int os::numa_get_group_id() { return 0; }
3478 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3479 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3480 // Provide an answer for UMA systems
3481 ids[0] = 0;
3482 return 1;
3483 } else {
3484 // check for size bigger than actual groups_num
3485 size = MIN2(size, numa_get_groups_num());
3486 for (int i = 0; i < (int)size; i++) {
3487 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3488 }
3489 return size;
3490 }
3491 }
3493 bool os::get_page_info(char *start, page_info* info) {
3494 return false;
3495 }
3497 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3498 return end;
3499 }
3501 char* os::non_memory_address_word() {
3502 // Must never look like an address returned by reserve_memory,
3503 // even in its subfields (as defined by the CPU immediate fields,
3504 // if the CPU splits constants across multiple instructions).
3505 return (char*)-1;
3506 }
3508 #define MAX_ERROR_COUNT 100
3509 #define SYS_THREAD_ERROR 0xffffffffUL
3511 void os::pd_start_thread(Thread* thread) {
3512 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3513 // Returns previous suspend state:
3514 // 0: Thread was not suspended
3515 // 1: Thread is running now
3516 // >1: Thread is still suspended.
3517 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3518 }
3520 class HighResolutionInterval : public CHeapObj<mtThread> {
3521 // The default timer resolution seems to be 10 milliseconds.
3522 // (Where is this written down?)
3523 // If someone wants to sleep for only a fraction of the default,
3524 // then we set the timer resolution down to 1 millisecond for
3525 // the duration of their interval.
3526 // We carefully set the resolution back, since otherwise we
3527 // seem to incur an overhead (3%?) that we don't need.
3528 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3529 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3530 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3531 // timeBeginPeriod() if the relative error exceeded some threshold.
3532 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3533 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3534 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3535 // resolution timers running.
3536 private:
3537 jlong resolution;
3538 public:
3539 HighResolutionInterval(jlong ms) {
3540 resolution = ms % 10L;
3541 if (resolution != 0) {
3542 MMRESULT result = timeBeginPeriod(1L);
3543 }
3544 }
3545 ~HighResolutionInterval() {
3546 if (resolution != 0) {
3547 MMRESULT result = timeEndPeriod(1L);
3548 }
3549 resolution = 0L;
3550 }
3551 };
3553 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3554 jlong limit = (jlong) MAXDWORD;
3556 while(ms > limit) {
3557 int res;
3558 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3559 return res;
3560 ms -= limit;
3561 }
3563 assert(thread == Thread::current(), "thread consistency check");
3564 OSThread* osthread = thread->osthread();
3565 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3566 int result;
3567 if (interruptable) {
3568 assert(thread->is_Java_thread(), "must be java thread");
3569 JavaThread *jt = (JavaThread *) thread;
3570 ThreadBlockInVM tbivm(jt);
3572 jt->set_suspend_equivalent();
3573 // cleared by handle_special_suspend_equivalent_condition() or
3574 // java_suspend_self() via check_and_wait_while_suspended()
3576 HANDLE events[1];
3577 events[0] = osthread->interrupt_event();
3578 HighResolutionInterval *phri=NULL;
3579 if(!ForceTimeHighResolution)
3580 phri = new HighResolutionInterval( ms );
3581 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3582 result = OS_TIMEOUT;
3583 } else {
3584 ResetEvent(osthread->interrupt_event());
3585 osthread->set_interrupted(false);
3586 result = OS_INTRPT;
3587 }
3588 delete phri; //if it is NULL, harmless
3590 // were we externally suspended while we were waiting?
3591 jt->check_and_wait_while_suspended();
3592 } else {
3593 assert(!thread->is_Java_thread(), "must not be java thread");
3594 Sleep((long) ms);
3595 result = OS_TIMEOUT;
3596 }
3597 return result;
3598 }
3600 //
3601 // Short sleep, direct OS call.
3602 //
3603 // ms = 0, means allow others (if any) to run.
3604 //
3605 void os::naked_short_sleep(jlong ms) {
3606 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3607 Sleep(ms);
3608 }
3610 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3611 void os::infinite_sleep() {
3612 while (true) { // sleep forever ...
3613 Sleep(100000); // ... 100 seconds at a time
3614 }
3615 }
3617 typedef BOOL (WINAPI * STTSignature)(void) ;
3619 os::YieldResult os::NakedYield() {
3620 // Use either SwitchToThread() or Sleep(0)
3621 // Consider passing back the return value from SwitchToThread().
3622 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3623 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3624 } else {
3625 Sleep(0);
3626 }
3627 return os::YIELD_UNKNOWN ;
3628 }
3630 void os::yield() { os::NakedYield(); }
3632 void os::yield_all(int attempts) {
3633 // Yields to all threads, including threads with lower priorities
3634 Sleep(1);
3635 }
3637 // Win32 only gives you access to seven real priorities at a time,
3638 // so we compress Java's ten down to seven. It would be better
3639 // if we dynamically adjusted relative priorities.
3641 int os::java_to_os_priority[CriticalPriority + 1] = {
3642 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3643 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3644 THREAD_PRIORITY_LOWEST, // 2
3645 THREAD_PRIORITY_BELOW_NORMAL, // 3
3646 THREAD_PRIORITY_BELOW_NORMAL, // 4
3647 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3648 THREAD_PRIORITY_NORMAL, // 6
3649 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3650 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3651 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3652 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3653 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3654 };
3656 int prio_policy1[CriticalPriority + 1] = {
3657 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3658 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3659 THREAD_PRIORITY_LOWEST, // 2
3660 THREAD_PRIORITY_BELOW_NORMAL, // 3
3661 THREAD_PRIORITY_BELOW_NORMAL, // 4
3662 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3663 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3664 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3665 THREAD_PRIORITY_HIGHEST, // 8
3666 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3667 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3668 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3669 };
3671 static int prio_init() {
3672 // If ThreadPriorityPolicy is 1, switch tables
3673 if (ThreadPriorityPolicy == 1) {
3674 int i;
3675 for (i = 0; i < CriticalPriority + 1; i++) {
3676 os::java_to_os_priority[i] = prio_policy1[i];
3677 }
3678 }
3679 if (UseCriticalJavaThreadPriority) {
3680 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3681 }
3682 return 0;
3683 }
3685 OSReturn os::set_native_priority(Thread* thread, int priority) {
3686 if (!UseThreadPriorities) return OS_OK;
3687 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3688 return ret ? OS_OK : OS_ERR;
3689 }
3691 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3692 if ( !UseThreadPriorities ) {
3693 *priority_ptr = java_to_os_priority[NormPriority];
3694 return OS_OK;
3695 }
3696 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3697 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3698 assert(false, "GetThreadPriority failed");
3699 return OS_ERR;
3700 }
3701 *priority_ptr = os_prio;
3702 return OS_OK;
3703 }
3706 // Hint to the underlying OS that a task switch would not be good.
3707 // Void return because it's a hint and can fail.
3708 void os::hint_no_preempt() {}
3710 void os::interrupt(Thread* thread) {
3711 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3712 "possibility of dangling Thread pointer");
3714 OSThread* osthread = thread->osthread();
3715 osthread->set_interrupted(true);
3716 // More than one thread can get here with the same value of osthread,
3717 // resulting in multiple notifications. We do, however, want the store
3718 // to interrupted() to be visible to other threads before we post
3719 // the interrupt event.
3720 OrderAccess::release();
3721 SetEvent(osthread->interrupt_event());
3722 // For JSR166: unpark after setting status
3723 if (thread->is_Java_thread())
3724 ((JavaThread*)thread)->parker()->unpark();
3726 ParkEvent * ev = thread->_ParkEvent ;
3727 if (ev != NULL) ev->unpark() ;
3729 }
3732 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3733 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3734 "possibility of dangling Thread pointer");
3736 OSThread* osthread = thread->osthread();
3737 // There is no synchronization between the setting of the interrupt
3738 // and it being cleared here. It is critical - see 6535709 - that
3739 // we only clear the interrupt state, and reset the interrupt event,
3740 // if we are going to report that we were indeed interrupted - else
3741 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3742 // depending on the timing. By checking thread interrupt event to see
3743 // if the thread gets real interrupt thus prevent spurious wakeup.
3744 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3745 if (interrupted && clear_interrupted) {
3746 osthread->set_interrupted(false);
3747 ResetEvent(osthread->interrupt_event());
3748 } // Otherwise leave the interrupted state alone
3750 return interrupted;
3751 }
3753 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3754 ExtendedPC os::get_thread_pc(Thread* thread) {
3755 CONTEXT context;
3756 context.ContextFlags = CONTEXT_CONTROL;
3757 HANDLE handle = thread->osthread()->thread_handle();
3758 #ifdef _M_IA64
3759 assert(0, "Fix get_thread_pc");
3760 return ExtendedPC(NULL);
3761 #else
3762 if (GetThreadContext(handle, &context)) {
3763 #ifdef _M_AMD64
3764 return ExtendedPC((address) context.Rip);
3765 #else
3766 return ExtendedPC((address) context.Eip);
3767 #endif
3768 } else {
3769 return ExtendedPC(NULL);
3770 }
3771 #endif
3772 }
3774 // GetCurrentThreadId() returns DWORD
3775 intx os::current_thread_id() { return GetCurrentThreadId(); }
3777 static int _initial_pid = 0;
3779 int os::current_process_id()
3780 {
3781 return (_initial_pid ? _initial_pid : _getpid());
3782 }
3784 int os::win32::_vm_page_size = 0;
3785 int os::win32::_vm_allocation_granularity = 0;
3786 int os::win32::_processor_type = 0;
3787 // Processor level is not available on non-NT systems, use vm_version instead
3788 int os::win32::_processor_level = 0;
3789 julong os::win32::_physical_memory = 0;
3790 size_t os::win32::_default_stack_size = 0;
3792 intx os::win32::_os_thread_limit = 0;
3793 volatile intx os::win32::_os_thread_count = 0;
3795 bool os::win32::_is_nt = false;
3796 bool os::win32::_is_windows_2003 = false;
3797 bool os::win32::_is_windows_server = false;
3799 void os::win32::initialize_system_info() {
3800 SYSTEM_INFO si;
3801 GetSystemInfo(&si);
3802 _vm_page_size = si.dwPageSize;
3803 _vm_allocation_granularity = si.dwAllocationGranularity;
3804 _processor_type = si.dwProcessorType;
3805 _processor_level = si.wProcessorLevel;
3806 set_processor_count(si.dwNumberOfProcessors);
3808 MEMORYSTATUSEX ms;
3809 ms.dwLength = sizeof(ms);
3811 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3812 // dwMemoryLoad (% of memory in use)
3813 GlobalMemoryStatusEx(&ms);
3814 _physical_memory = ms.ullTotalPhys;
3816 OSVERSIONINFOEX oi;
3817 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3818 GetVersionEx((OSVERSIONINFO*)&oi);
3819 switch(oi.dwPlatformId) {
3820 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3821 case VER_PLATFORM_WIN32_NT:
3822 _is_nt = true;
3823 {
3824 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3825 if (os_vers == 5002) {
3826 _is_windows_2003 = true;
3827 }
3828 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3829 oi.wProductType == VER_NT_SERVER) {
3830 _is_windows_server = true;
3831 }
3832 }
3833 break;
3834 default: fatal("Unknown platform");
3835 }
3837 _default_stack_size = os::current_stack_size();
3838 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3839 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3840 "stack size not a multiple of page size");
3842 initialize_performance_counter();
3844 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3845 // known to deadlock the system, if the VM issues to thread operations with
3846 // a too high frequency, e.g., such as changing the priorities.
3847 // The 6000 seems to work well - no deadlocks has been notices on the test
3848 // programs that we have seen experience this problem.
3849 if (!os::win32::is_nt()) {
3850 StarvationMonitorInterval = 6000;
3851 }
3852 }
3855 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3856 char path[MAX_PATH];
3857 DWORD size;
3858 DWORD pathLen = (DWORD)sizeof(path);
3859 HINSTANCE result = NULL;
3861 // only allow library name without path component
3862 assert(strchr(name, '\\') == NULL, "path not allowed");
3863 assert(strchr(name, ':') == NULL, "path not allowed");
3864 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3865 jio_snprintf(ebuf, ebuflen,
3866 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3867 return NULL;
3868 }
3870 // search system directory
3871 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3872 strcat(path, "\\");
3873 strcat(path, name);
3874 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3875 return result;
3876 }
3877 }
3879 // try Windows directory
3880 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3881 strcat(path, "\\");
3882 strcat(path, name);
3883 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3884 return result;
3885 }
3886 }
3888 jio_snprintf(ebuf, ebuflen,
3889 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3890 return NULL;
3891 }
3893 void os::win32::setmode_streams() {
3894 _setmode(_fileno(stdin), _O_BINARY);
3895 _setmode(_fileno(stdout), _O_BINARY);
3896 _setmode(_fileno(stderr), _O_BINARY);
3897 }
3900 bool os::is_debugger_attached() {
3901 return IsDebuggerPresent() ? true : false;
3902 }
3905 void os::wait_for_keypress_at_exit(void) {
3906 if (PauseAtExit) {
3907 fprintf(stderr, "Press any key to continue...\n");
3908 fgetc(stdin);
3909 }
3910 }
3913 int os::message_box(const char* title, const char* message) {
3914 int result = MessageBox(NULL, message, title,
3915 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3916 return result == IDYES;
3917 }
3919 int os::allocate_thread_local_storage() {
3920 return TlsAlloc();
3921 }
3924 void os::free_thread_local_storage(int index) {
3925 TlsFree(index);
3926 }
3929 void os::thread_local_storage_at_put(int index, void* value) {
3930 TlsSetValue(index, value);
3931 assert(thread_local_storage_at(index) == value, "Just checking");
3932 }
3935 void* os::thread_local_storage_at(int index) {
3936 return TlsGetValue(index);
3937 }
3940 #ifndef PRODUCT
3941 #ifndef _WIN64
3942 // Helpers to check whether NX protection is enabled
3943 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3944 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3945 pex->ExceptionRecord->NumberParameters > 0 &&
3946 pex->ExceptionRecord->ExceptionInformation[0] ==
3947 EXCEPTION_INFO_EXEC_VIOLATION) {
3948 return EXCEPTION_EXECUTE_HANDLER;
3949 }
3950 return EXCEPTION_CONTINUE_SEARCH;
3951 }
3953 void nx_check_protection() {
3954 // If NX is enabled we'll get an exception calling into code on the stack
3955 char code[] = { (char)0xC3 }; // ret
3956 void *code_ptr = (void *)code;
3957 __try {
3958 __asm call code_ptr
3959 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3960 tty->print_raw_cr("NX protection detected.");
3961 }
3962 }
3963 #endif // _WIN64
3964 #endif // PRODUCT
3966 // this is called _before_ the global arguments have been parsed
3967 void os::init(void) {
3968 _initial_pid = _getpid();
3970 init_random(1234567);
3972 win32::initialize_system_info();
3973 win32::setmode_streams();
3974 init_page_sizes((size_t) win32::vm_page_size());
3976 // For better scalability on MP systems (must be called after initialize_system_info)
3977 #ifndef PRODUCT
3978 if (is_MP()) {
3979 NoYieldsInMicrolock = true;
3980 }
3981 #endif
3982 // This may be overridden later when argument processing is done.
3983 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3984 os::win32::is_windows_2003());
3986 // Initialize main_process and main_thread
3987 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3988 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3989 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3990 fatal("DuplicateHandle failed\n");
3991 }
3992 main_thread_id = (int) GetCurrentThreadId();
3993 }
3995 // To install functions for atexit processing
3996 extern "C" {
3997 static void perfMemory_exit_helper() {
3998 perfMemory_exit();
3999 }
4000 }
4002 static jint initSock();
4004 // this is called _after_ the global arguments have been parsed
4005 jint os::init_2(void) {
4006 // Allocate a single page and mark it as readable for safepoint polling
4007 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
4008 guarantee( polling_page != NULL, "Reserve Failed for polling page");
4010 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
4011 guarantee( return_page != NULL, "Commit Failed for polling page");
4013 os::set_polling_page( polling_page );
4015 #ifndef PRODUCT
4016 if( Verbose && PrintMiscellaneous )
4017 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4018 #endif
4020 if (!UseMembar) {
4021 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
4022 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
4024 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
4025 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
4027 os::set_memory_serialize_page( mem_serialize_page );
4029 #ifndef PRODUCT
4030 if(Verbose && PrintMiscellaneous)
4031 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4032 #endif
4033 }
4035 // Setup Windows Exceptions
4037 // for debugging float code generation bugs
4038 if (ForceFloatExceptions) {
4039 #ifndef _WIN64
4040 static long fp_control_word = 0;
4041 __asm { fstcw fp_control_word }
4042 // see Intel PPro Manual, Vol. 2, p 7-16
4043 const long precision = 0x20;
4044 const long underflow = 0x10;
4045 const long overflow = 0x08;
4046 const long zero_div = 0x04;
4047 const long denorm = 0x02;
4048 const long invalid = 0x01;
4049 fp_control_word |= invalid;
4050 __asm { fldcw fp_control_word }
4051 #endif
4052 }
4054 // If stack_commit_size is 0, windows will reserve the default size,
4055 // but only commit a small portion of it.
4056 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4057 size_t default_reserve_size = os::win32::default_stack_size();
4058 size_t actual_reserve_size = stack_commit_size;
4059 if (stack_commit_size < default_reserve_size) {
4060 // If stack_commit_size == 0, we want this too
4061 actual_reserve_size = default_reserve_size;
4062 }
4064 // Check minimum allowable stack size for thread creation and to initialize
4065 // the java system classes, including StackOverflowError - depends on page
4066 // size. Add a page for compiler2 recursion in main thread.
4067 // Add in 2*BytesPerWord times page size to account for VM stack during
4068 // class initialization depending on 32 or 64 bit VM.
4069 size_t min_stack_allowed =
4070 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4071 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4072 if (actual_reserve_size < min_stack_allowed) {
4073 tty->print_cr("\nThe stack size specified is too small, "
4074 "Specify at least %dk",
4075 min_stack_allowed / K);
4076 return JNI_ERR;
4077 }
4079 JavaThread::set_stack_size_at_create(stack_commit_size);
4081 // Calculate theoretical max. size of Threads to guard gainst artifical
4082 // out-of-memory situations, where all available address-space has been
4083 // reserved by thread stacks.
4084 assert(actual_reserve_size != 0, "Must have a stack");
4086 // Calculate the thread limit when we should start doing Virtual Memory
4087 // banging. Currently when the threads will have used all but 200Mb of space.
4088 //
4089 // TODO: consider performing a similar calculation for commit size instead
4090 // as reserve size, since on a 64-bit platform we'll run into that more
4091 // often than running out of virtual memory space. We can use the
4092 // lower value of the two calculations as the os_thread_limit.
4093 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4094 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4096 // at exit methods are called in the reverse order of their registration.
4097 // there is no limit to the number of functions registered. atexit does
4098 // not set errno.
4100 if (PerfAllowAtExitRegistration) {
4101 // only register atexit functions if PerfAllowAtExitRegistration is set.
4102 // atexit functions can be delayed until process exit time, which
4103 // can be problematic for embedded VM situations. Embedded VMs should
4104 // call DestroyJavaVM() to assure that VM resources are released.
4106 // note: perfMemory_exit_helper atexit function may be removed in
4107 // the future if the appropriate cleanup code can be added to the
4108 // VM_Exit VMOperation's doit method.
4109 if (atexit(perfMemory_exit_helper) != 0) {
4110 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4111 }
4112 }
4114 #ifndef _WIN64
4115 // Print something if NX is enabled (win32 on AMD64)
4116 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4117 #endif
4119 // initialize thread priority policy
4120 prio_init();
4122 if (UseNUMA && !ForceNUMA) {
4123 UseNUMA = false; // We don't fully support this yet
4124 }
4126 if (UseNUMAInterleaving) {
4127 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4128 bool success = numa_interleaving_init();
4129 if (!success) UseNUMAInterleaving = false;
4130 }
4132 if (initSock() != JNI_OK) {
4133 return JNI_ERR;
4134 }
4136 return JNI_OK;
4137 }
4139 // Mark the polling page as unreadable
4140 void os::make_polling_page_unreadable(void) {
4141 DWORD old_status;
4142 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4143 fatal("Could not disable polling page");
4144 };
4146 // Mark the polling page as readable
4147 void os::make_polling_page_readable(void) {
4148 DWORD old_status;
4149 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4150 fatal("Could not enable polling page");
4151 };
4154 int os::stat(const char *path, struct stat *sbuf) {
4155 char pathbuf[MAX_PATH];
4156 if (strlen(path) > MAX_PATH - 1) {
4157 errno = ENAMETOOLONG;
4158 return -1;
4159 }
4160 os::native_path(strcpy(pathbuf, path));
4161 int ret = ::stat(pathbuf, sbuf);
4162 if (sbuf != NULL && UseUTCFileTimestamp) {
4163 // Fix for 6539723. st_mtime returned from stat() is dependent on
4164 // the system timezone and so can return different values for the
4165 // same file if/when daylight savings time changes. This adjustment
4166 // makes sure the same timestamp is returned regardless of the TZ.
4167 //
4168 // See:
4169 // http://msdn.microsoft.com/library/
4170 // default.asp?url=/library/en-us/sysinfo/base/
4171 // time_zone_information_str.asp
4172 // and
4173 // http://msdn.microsoft.com/library/default.asp?url=
4174 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4175 //
4176 // NOTE: there is a insidious bug here: If the timezone is changed
4177 // after the call to stat() but before 'GetTimeZoneInformation()', then
4178 // the adjustment we do here will be wrong and we'll return the wrong
4179 // value (which will likely end up creating an invalid class data
4180 // archive). Absent a better API for this, or some time zone locking
4181 // mechanism, we'll have to live with this risk.
4182 TIME_ZONE_INFORMATION tz;
4183 DWORD tzid = GetTimeZoneInformation(&tz);
4184 int daylightBias =
4185 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4186 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4187 }
4188 return ret;
4189 }
4192 #define FT2INT64(ft) \
4193 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4196 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4197 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4198 // of a thread.
4199 //
4200 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4201 // the fast estimate available on the platform.
4203 // current_thread_cpu_time() is not optimized for Windows yet
4204 jlong os::current_thread_cpu_time() {
4205 // return user + sys since the cost is the same
4206 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4207 }
4209 jlong os::thread_cpu_time(Thread* thread) {
4210 // consistent with what current_thread_cpu_time() returns.
4211 return os::thread_cpu_time(thread, true /* user+sys */);
4212 }
4214 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4215 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4216 }
4218 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4219 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4220 // If this function changes, os::is_thread_cpu_time_supported() should too
4221 if (os::win32::is_nt()) {
4222 FILETIME CreationTime;
4223 FILETIME ExitTime;
4224 FILETIME KernelTime;
4225 FILETIME UserTime;
4227 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4228 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4229 return -1;
4230 else
4231 if (user_sys_cpu_time) {
4232 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4233 } else {
4234 return FT2INT64(UserTime) * 100;
4235 }
4236 } else {
4237 return (jlong) timeGetTime() * 1000000;
4238 }
4239 }
4241 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4242 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4243 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4244 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4245 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4246 }
4248 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4249 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4250 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4251 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4252 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4253 }
4255 bool os::is_thread_cpu_time_supported() {
4256 // see os::thread_cpu_time
4257 if (os::win32::is_nt()) {
4258 FILETIME CreationTime;
4259 FILETIME ExitTime;
4260 FILETIME KernelTime;
4261 FILETIME UserTime;
4263 if ( GetThreadTimes(GetCurrentThread(),
4264 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4265 return false;
4266 else
4267 return true;
4268 } else {
4269 return false;
4270 }
4271 }
4273 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4274 // It does have primitives (PDH API) to get CPU usage and run queue length.
4275 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4276 // If we wanted to implement loadavg on Windows, we have a few options:
4277 //
4278 // a) Query CPU usage and run queue length and "fake" an answer by
4279 // returning the CPU usage if it's under 100%, and the run queue
4280 // length otherwise. It turns out that querying is pretty slow
4281 // on Windows, on the order of 200 microseconds on a fast machine.
4282 // Note that on the Windows the CPU usage value is the % usage
4283 // since the last time the API was called (and the first call
4284 // returns 100%), so we'd have to deal with that as well.
4285 //
4286 // b) Sample the "fake" answer using a sampling thread and store
4287 // the answer in a global variable. The call to loadavg would
4288 // just return the value of the global, avoiding the slow query.
4289 //
4290 // c) Sample a better answer using exponential decay to smooth the
4291 // value. This is basically the algorithm used by UNIX kernels.
4292 //
4293 // Note that sampling thread starvation could affect both (b) and (c).
4294 int os::loadavg(double loadavg[], int nelem) {
4295 return -1;
4296 }
4299 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4300 bool os::dont_yield() {
4301 return DontYieldALot;
4302 }
4304 // This method is a slightly reworked copy of JDK's sysOpen
4305 // from src/windows/hpi/src/sys_api_md.c
4307 int os::open(const char *path, int oflag, int mode) {
4308 char pathbuf[MAX_PATH];
4310 if (strlen(path) > MAX_PATH - 1) {
4311 errno = ENAMETOOLONG;
4312 return -1;
4313 }
4314 os::native_path(strcpy(pathbuf, path));
4315 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4316 }
4318 FILE* os::open(int fd, const char* mode) {
4319 return ::_fdopen(fd, mode);
4320 }
4322 // Is a (classpath) directory empty?
4323 bool os::dir_is_empty(const char* path) {
4324 WIN32_FIND_DATA fd;
4325 HANDLE f = FindFirstFile(path, &fd);
4326 if (f == INVALID_HANDLE_VALUE) {
4327 return true;
4328 }
4329 FindClose(f);
4330 return false;
4331 }
4333 // create binary file, rewriting existing file if required
4334 int os::create_binary_file(const char* path, bool rewrite_existing) {
4335 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4336 if (!rewrite_existing) {
4337 oflags |= _O_EXCL;
4338 }
4339 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4340 }
4342 // return current position of file pointer
4343 jlong os::current_file_offset(int fd) {
4344 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4345 }
4347 // move file pointer to the specified offset
4348 jlong os::seek_to_file_offset(int fd, jlong offset) {
4349 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4350 }
4353 jlong os::lseek(int fd, jlong offset, int whence) {
4354 return (jlong) ::_lseeki64(fd, offset, whence);
4355 }
4357 // This method is a slightly reworked copy of JDK's sysNativePath
4358 // from src/windows/hpi/src/path_md.c
4360 /* Convert a pathname to native format. On win32, this involves forcing all
4361 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4362 sometimes rejects '/') and removing redundant separators. The input path is
4363 assumed to have been converted into the character encoding used by the local
4364 system. Because this might be a double-byte encoding, care is taken to
4365 treat double-byte lead characters correctly.
4367 This procedure modifies the given path in place, as the result is never
4368 longer than the original. There is no error return; this operation always
4369 succeeds. */
4370 char * os::native_path(char *path) {
4371 char *src = path, *dst = path, *end = path;
4372 char *colon = NULL; /* If a drive specifier is found, this will
4373 point to the colon following the drive
4374 letter */
4376 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4377 assert(((!::IsDBCSLeadByte('/'))
4378 && (!::IsDBCSLeadByte('\\'))
4379 && (!::IsDBCSLeadByte(':'))),
4380 "Illegal lead byte");
4382 /* Check for leading separators */
4383 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4384 while (isfilesep(*src)) {
4385 src++;
4386 }
4388 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4389 /* Remove leading separators if followed by drive specifier. This
4390 hack is necessary to support file URLs containing drive
4391 specifiers (e.g., "file://c:/path"). As a side effect,
4392 "/c:/path" can be used as an alternative to "c:/path". */
4393 *dst++ = *src++;
4394 colon = dst;
4395 *dst++ = ':';
4396 src++;
4397 } else {
4398 src = path;
4399 if (isfilesep(src[0]) && isfilesep(src[1])) {
4400 /* UNC pathname: Retain first separator; leave src pointed at
4401 second separator so that further separators will be collapsed
4402 into the second separator. The result will be a pathname
4403 beginning with "\\\\" followed (most likely) by a host name. */
4404 src = dst = path + 1;
4405 path[0] = '\\'; /* Force first separator to '\\' */
4406 }
4407 }
4409 end = dst;
4411 /* Remove redundant separators from remainder of path, forcing all
4412 separators to be '\\' rather than '/'. Also, single byte space
4413 characters are removed from the end of the path because those
4414 are not legal ending characters on this operating system.
4415 */
4416 while (*src != '\0') {
4417 if (isfilesep(*src)) {
4418 *dst++ = '\\'; src++;
4419 while (isfilesep(*src)) src++;
4420 if (*src == '\0') {
4421 /* Check for trailing separator */
4422 end = dst;
4423 if (colon == dst - 2) break; /* "z:\\" */
4424 if (dst == path + 1) break; /* "\\" */
4425 if (dst == path + 2 && isfilesep(path[0])) {
4426 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4427 beginning of a UNC pathname. Even though it is not, by
4428 itself, a valid UNC pathname, we leave it as is in order
4429 to be consistent with the path canonicalizer as well
4430 as the win32 APIs, which treat this case as an invalid
4431 UNC pathname rather than as an alias for the root
4432 directory of the current drive. */
4433 break;
4434 }
4435 end = --dst; /* Path does not denote a root directory, so
4436 remove trailing separator */
4437 break;
4438 }
4439 end = dst;
4440 } else {
4441 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4442 *dst++ = *src++;
4443 if (*src) *dst++ = *src++;
4444 end = dst;
4445 } else { /* Copy a single-byte character */
4446 char c = *src++;
4447 *dst++ = c;
4448 /* Space is not a legal ending character */
4449 if (c != ' ') end = dst;
4450 }
4451 }
4452 }
4454 *end = '\0';
4456 /* For "z:", add "." to work around a bug in the C runtime library */
4457 if (colon == dst - 1) {
4458 path[2] = '.';
4459 path[3] = '\0';
4460 }
4462 return path;
4463 }
4465 // This code is a copy of JDK's sysSetLength
4466 // from src/windows/hpi/src/sys_api_md.c
4468 int os::ftruncate(int fd, jlong length) {
4469 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4470 long high = (long)(length >> 32);
4471 DWORD ret;
4473 if (h == (HANDLE)(-1)) {
4474 return -1;
4475 }
4477 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4478 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4479 return -1;
4480 }
4482 if (::SetEndOfFile(h) == FALSE) {
4483 return -1;
4484 }
4486 return 0;
4487 }
4490 // This code is a copy of JDK's sysSync
4491 // from src/windows/hpi/src/sys_api_md.c
4492 // except for the legacy workaround for a bug in Win 98
4494 int os::fsync(int fd) {
4495 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4497 if ( (!::FlushFileBuffers(handle)) &&
4498 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4499 /* from winerror.h */
4500 return -1;
4501 }
4502 return 0;
4503 }
4505 static int nonSeekAvailable(int, long *);
4506 static int stdinAvailable(int, long *);
4508 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4509 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4511 // This code is a copy of JDK's sysAvailable
4512 // from src/windows/hpi/src/sys_api_md.c
4514 int os::available(int fd, jlong *bytes) {
4515 jlong cur, end;
4516 struct _stati64 stbuf64;
4518 if (::_fstati64(fd, &stbuf64) >= 0) {
4519 int mode = stbuf64.st_mode;
4520 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4521 int ret;
4522 long lpbytes;
4523 if (fd == 0) {
4524 ret = stdinAvailable(fd, &lpbytes);
4525 } else {
4526 ret = nonSeekAvailable(fd, &lpbytes);
4527 }
4528 (*bytes) = (jlong)(lpbytes);
4529 return ret;
4530 }
4531 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4532 return FALSE;
4533 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4534 return FALSE;
4535 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4536 return FALSE;
4537 }
4538 *bytes = end - cur;
4539 return TRUE;
4540 } else {
4541 return FALSE;
4542 }
4543 }
4545 // This code is a copy of JDK's nonSeekAvailable
4546 // from src/windows/hpi/src/sys_api_md.c
4548 static int nonSeekAvailable(int fd, long *pbytes) {
4549 /* This is used for available on non-seekable devices
4550 * (like both named and anonymous pipes, such as pipes
4551 * connected to an exec'd process).
4552 * Standard Input is a special case.
4553 *
4554 */
4555 HANDLE han;
4557 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4558 return FALSE;
4559 }
4561 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4562 /* PeekNamedPipe fails when at EOF. In that case we
4563 * simply make *pbytes = 0 which is consistent with the
4564 * behavior we get on Solaris when an fd is at EOF.
4565 * The only alternative is to raise an Exception,
4566 * which isn't really warranted.
4567 */
4568 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4569 return FALSE;
4570 }
4571 *pbytes = 0;
4572 }
4573 return TRUE;
4574 }
4576 #define MAX_INPUT_EVENTS 2000
4578 // This code is a copy of JDK's stdinAvailable
4579 // from src/windows/hpi/src/sys_api_md.c
4581 static int stdinAvailable(int fd, long *pbytes) {
4582 HANDLE han;
4583 DWORD numEventsRead = 0; /* Number of events read from buffer */
4584 DWORD numEvents = 0; /* Number of events in buffer */
4585 DWORD i = 0; /* Loop index */
4586 DWORD curLength = 0; /* Position marker */
4587 DWORD actualLength = 0; /* Number of bytes readable */
4588 BOOL error = FALSE; /* Error holder */
4589 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4591 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4592 return FALSE;
4593 }
4595 /* Construct an array of input records in the console buffer */
4596 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4597 if (error == 0) {
4598 return nonSeekAvailable(fd, pbytes);
4599 }
4601 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4602 if (numEvents > MAX_INPUT_EVENTS) {
4603 numEvents = MAX_INPUT_EVENTS;
4604 }
4606 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4607 if (lpBuffer == NULL) {
4608 return FALSE;
4609 }
4611 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4612 if (error == 0) {
4613 os::free(lpBuffer, mtInternal);
4614 return FALSE;
4615 }
4617 /* Examine input records for the number of bytes available */
4618 for(i=0; i<numEvents; i++) {
4619 if (lpBuffer[i].EventType == KEY_EVENT) {
4621 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4622 &(lpBuffer[i].Event);
4623 if (keyRecord->bKeyDown == TRUE) {
4624 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4625 curLength++;
4626 if (*keyPressed == '\r') {
4627 actualLength = curLength;
4628 }
4629 }
4630 }
4631 }
4633 if(lpBuffer != NULL) {
4634 os::free(lpBuffer, mtInternal);
4635 }
4637 *pbytes = (long) actualLength;
4638 return TRUE;
4639 }
4641 // Map a block of memory.
4642 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4643 char *addr, size_t bytes, bool read_only,
4644 bool allow_exec) {
4645 HANDLE hFile;
4646 char* base;
4648 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4649 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4650 if (hFile == NULL) {
4651 if (PrintMiscellaneous && Verbose) {
4652 DWORD err = GetLastError();
4653 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4654 }
4655 return NULL;
4656 }
4658 if (allow_exec) {
4659 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4660 // unless it comes from a PE image (which the shared archive is not.)
4661 // Even VirtualProtect refuses to give execute access to mapped memory
4662 // that was not previously executable.
4663 //
4664 // Instead, stick the executable region in anonymous memory. Yuck.
4665 // Penalty is that ~4 pages will not be shareable - in the future
4666 // we might consider DLLizing the shared archive with a proper PE
4667 // header so that mapping executable + sharing is possible.
4669 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4670 PAGE_READWRITE);
4671 if (base == NULL) {
4672 if (PrintMiscellaneous && Verbose) {
4673 DWORD err = GetLastError();
4674 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4675 }
4676 CloseHandle(hFile);
4677 return NULL;
4678 }
4680 DWORD bytes_read;
4681 OVERLAPPED overlapped;
4682 overlapped.Offset = (DWORD)file_offset;
4683 overlapped.OffsetHigh = 0;
4684 overlapped.hEvent = NULL;
4685 // ReadFile guarantees that if the return value is true, the requested
4686 // number of bytes were read before returning.
4687 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4688 if (!res) {
4689 if (PrintMiscellaneous && Verbose) {
4690 DWORD err = GetLastError();
4691 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4692 }
4693 release_memory(base, bytes);
4694 CloseHandle(hFile);
4695 return NULL;
4696 }
4697 } else {
4698 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4699 NULL /*file_name*/);
4700 if (hMap == NULL) {
4701 if (PrintMiscellaneous && Verbose) {
4702 DWORD err = GetLastError();
4703 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4704 }
4705 CloseHandle(hFile);
4706 return NULL;
4707 }
4709 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4710 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4711 (DWORD)bytes, addr);
4712 if (base == NULL) {
4713 if (PrintMiscellaneous && Verbose) {
4714 DWORD err = GetLastError();
4715 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4716 }
4717 CloseHandle(hMap);
4718 CloseHandle(hFile);
4719 return NULL;
4720 }
4722 if (CloseHandle(hMap) == 0) {
4723 if (PrintMiscellaneous && Verbose) {
4724 DWORD err = GetLastError();
4725 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4726 }
4727 CloseHandle(hFile);
4728 return base;
4729 }
4730 }
4732 if (allow_exec) {
4733 DWORD old_protect;
4734 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4735 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4737 if (!res) {
4738 if (PrintMiscellaneous && Verbose) {
4739 DWORD err = GetLastError();
4740 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4741 }
4742 // Don't consider this a hard error, on IA32 even if the
4743 // VirtualProtect fails, we should still be able to execute
4744 CloseHandle(hFile);
4745 return base;
4746 }
4747 }
4749 if (CloseHandle(hFile) == 0) {
4750 if (PrintMiscellaneous && Verbose) {
4751 DWORD err = GetLastError();
4752 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4753 }
4754 return base;
4755 }
4757 return base;
4758 }
4761 // Remap a block of memory.
4762 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4763 char *addr, size_t bytes, bool read_only,
4764 bool allow_exec) {
4765 // This OS does not allow existing memory maps to be remapped so we
4766 // have to unmap the memory before we remap it.
4767 if (!os::unmap_memory(addr, bytes)) {
4768 return NULL;
4769 }
4771 // There is a very small theoretical window between the unmap_memory()
4772 // call above and the map_memory() call below where a thread in native
4773 // code may be able to access an address that is no longer mapped.
4775 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4776 read_only, allow_exec);
4777 }
4780 // Unmap a block of memory.
4781 // Returns true=success, otherwise false.
4783 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4784 BOOL result = UnmapViewOfFile(addr);
4785 if (result == 0) {
4786 if (PrintMiscellaneous && Verbose) {
4787 DWORD err = GetLastError();
4788 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4789 }
4790 return false;
4791 }
4792 return true;
4793 }
4795 void os::pause() {
4796 char filename[MAX_PATH];
4797 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4798 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4799 } else {
4800 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4801 }
4803 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4804 if (fd != -1) {
4805 struct stat buf;
4806 ::close(fd);
4807 while (::stat(filename, &buf) == 0) {
4808 Sleep(100);
4809 }
4810 } else {
4811 jio_fprintf(stderr,
4812 "Could not open pause file '%s', continuing immediately.\n", filename);
4813 }
4814 }
4816 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4817 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4818 }
4820 /*
4821 * See the caveats for this class in os_windows.hpp
4822 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4823 * into this method and returns false. If no OS EXCEPTION was raised, returns
4824 * true.
4825 * The callback is supposed to provide the method that should be protected.
4826 */
4827 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4828 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4829 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4830 "crash_protection already set?");
4832 bool success = true;
4833 __try {
4834 WatcherThread::watcher_thread()->set_crash_protection(this);
4835 cb.call();
4836 } __except(EXCEPTION_EXECUTE_HANDLER) {
4837 // only for protection, nothing to do
4838 success = false;
4839 }
4840 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4841 return success;
4842 }
4844 // An Event wraps a win32 "CreateEvent" kernel handle.
4845 //
4846 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4847 //
4848 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4849 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4850 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4851 // In addition, an unpark() operation might fetch the handle field, but the
4852 // event could recycle between the fetch and the SetEvent() operation.
4853 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4854 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4855 // on an stale but recycled handle would be harmless, but in practice this might
4856 // confuse other non-Sun code, so it's not a viable approach.
4857 //
4858 // 2: Once a win32 event handle is associated with an Event, it remains associated
4859 // with the Event. The event handle is never closed. This could be construed
4860 // as handle leakage, but only up to the maximum # of threads that have been extant
4861 // at any one time. This shouldn't be an issue, as windows platforms typically
4862 // permit a process to have hundreds of thousands of open handles.
4863 //
4864 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4865 // and release unused handles.
4866 //
4867 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4868 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4869 //
4870 // 5. Use an RCU-like mechanism (Read-Copy Update).
4871 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4872 //
4873 // We use (2).
4874 //
4875 // TODO-FIXME:
4876 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4877 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4878 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4879 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4880 // into a single win32 CreateEvent() handle.
4881 //
4882 // _Event transitions in park()
4883 // -1 => -1 : illegal
4884 // 1 => 0 : pass - return immediately
4885 // 0 => -1 : block
4886 //
4887 // _Event serves as a restricted-range semaphore :
4888 // -1 : thread is blocked
4889 // 0 : neutral - thread is running or ready
4890 // 1 : signaled - thread is running or ready
4891 //
4892 // Another possible encoding of _Event would be
4893 // with explicit "PARKED" and "SIGNALED" bits.
4895 int os::PlatformEvent::park (jlong Millis) {
4896 guarantee (_ParkHandle != NULL , "Invariant") ;
4897 guarantee (Millis > 0 , "Invariant") ;
4898 int v ;
4900 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4901 // the initial park() operation.
4903 for (;;) {
4904 v = _Event ;
4905 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4906 }
4907 guarantee ((v == 0) || (v == 1), "invariant") ;
4908 if (v != 0) return OS_OK ;
4910 // Do this the hard way by blocking ...
4911 // TODO: consider a brief spin here, gated on the success of recent
4912 // spin attempts by this thread.
4913 //
4914 // We decompose long timeouts into series of shorter timed waits.
4915 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4916 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4917 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4918 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4919 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4920 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4921 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4922 // for the already waited time. This policy does not admit any new outcomes.
4923 // In the future, however, we might want to track the accumulated wait time and
4924 // adjust Millis accordingly if we encounter a spurious wakeup.
4926 const int MAXTIMEOUT = 0x10000000 ;
4927 DWORD rv = WAIT_TIMEOUT ;
4928 while (_Event < 0 && Millis > 0) {
4929 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4930 if (Millis > MAXTIMEOUT) {
4931 prd = MAXTIMEOUT ;
4932 }
4933 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4934 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4935 if (rv == WAIT_TIMEOUT) {
4936 Millis -= prd ;
4937 }
4938 }
4939 v = _Event ;
4940 _Event = 0 ;
4941 // see comment at end of os::PlatformEvent::park() below:
4942 OrderAccess::fence() ;
4943 // If we encounter a nearly simultanous timeout expiry and unpark()
4944 // we return OS_OK indicating we awoke via unpark().
4945 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4946 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4947 }
4949 void os::PlatformEvent::park () {
4950 guarantee (_ParkHandle != NULL, "Invariant") ;
4951 // Invariant: Only the thread associated with the Event/PlatformEvent
4952 // may call park().
4953 int v ;
4954 for (;;) {
4955 v = _Event ;
4956 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4957 }
4958 guarantee ((v == 0) || (v == 1), "invariant") ;
4959 if (v != 0) return ;
4961 // Do this the hard way by blocking ...
4962 // TODO: consider a brief spin here, gated on the success of recent
4963 // spin attempts by this thread.
4964 while (_Event < 0) {
4965 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4966 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4967 }
4969 // Usually we'll find _Event == 0 at this point, but as
4970 // an optional optimization we clear it, just in case can
4971 // multiple unpark() operations drove _Event up to 1.
4972 _Event = 0 ;
4973 OrderAccess::fence() ;
4974 guarantee (_Event >= 0, "invariant") ;
4975 }
4977 void os::PlatformEvent::unpark() {
4978 guarantee (_ParkHandle != NULL, "Invariant") ;
4980 // Transitions for _Event:
4981 // 0 :=> 1
4982 // 1 :=> 1
4983 // -1 :=> either 0 or 1; must signal target thread
4984 // That is, we can safely transition _Event from -1 to either
4985 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4986 // unpark() calls.
4987 // See also: "Semaphores in Plan 9" by Mullender & Cox
4988 //
4989 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4990 // that it will take two back-to-back park() calls for the owning
4991 // thread to block. This has the benefit of forcing a spurious return
4992 // from the first park() call after an unpark() call which will help
4993 // shake out uses of park() and unpark() without condition variables.
4995 if (Atomic::xchg(1, &_Event) >= 0) return;
4997 ::SetEvent(_ParkHandle);
4998 }
5001 // JSR166
5002 // -------------------------------------------------------
5004 /*
5005 * The Windows implementation of Park is very straightforward: Basic
5006 * operations on Win32 Events turn out to have the right semantics to
5007 * use them directly. We opportunistically resuse the event inherited
5008 * from Monitor.
5009 */
5012 void Parker::park(bool isAbsolute, jlong time) {
5013 guarantee (_ParkEvent != NULL, "invariant") ;
5014 // First, demultiplex/decode time arguments
5015 if (time < 0) { // don't wait
5016 return;
5017 }
5018 else if (time == 0 && !isAbsolute) {
5019 time = INFINITE;
5020 }
5021 else if (isAbsolute) {
5022 time -= os::javaTimeMillis(); // convert to relative time
5023 if (time <= 0) // already elapsed
5024 return;
5025 }
5026 else { // relative
5027 time /= 1000000; // Must coarsen from nanos to millis
5028 if (time == 0) // Wait for the minimal time unit if zero
5029 time = 1;
5030 }
5032 JavaThread* thread = (JavaThread*)(Thread::current());
5033 assert(thread->is_Java_thread(), "Must be JavaThread");
5034 JavaThread *jt = (JavaThread *)thread;
5036 // Don't wait if interrupted or already triggered
5037 if (Thread::is_interrupted(thread, false) ||
5038 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5039 ResetEvent(_ParkEvent);
5040 return;
5041 }
5042 else {
5043 ThreadBlockInVM tbivm(jt);
5044 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5045 jt->set_suspend_equivalent();
5047 WaitForSingleObject(_ParkEvent, time);
5048 ResetEvent(_ParkEvent);
5050 // If externally suspended while waiting, re-suspend
5051 if (jt->handle_special_suspend_equivalent_condition()) {
5052 jt->java_suspend_self();
5053 }
5054 }
5055 }
5057 void Parker::unpark() {
5058 guarantee (_ParkEvent != NULL, "invariant") ;
5059 SetEvent(_ParkEvent);
5060 }
5062 // Run the specified command in a separate process. Return its exit value,
5063 // or -1 on failure (e.g. can't create a new process).
5064 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5065 STARTUPINFO si;
5066 PROCESS_INFORMATION pi;
5068 memset(&si, 0, sizeof(si));
5069 si.cb = sizeof(si);
5070 memset(&pi, 0, sizeof(pi));
5071 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5072 cmd, // command line
5073 NULL, // process security attribute
5074 NULL, // thread security attribute
5075 TRUE, // inherits system handles
5076 0, // no creation flags
5077 NULL, // use parent's environment block
5078 NULL, // use parent's starting directory
5079 &si, // (in) startup information
5080 &pi); // (out) process information
5082 if (rslt) {
5083 // Wait until child process exits.
5084 WaitForSingleObject(pi.hProcess, INFINITE);
5086 DWORD exit_code;
5087 GetExitCodeProcess(pi.hProcess, &exit_code);
5089 // Close process and thread handles.
5090 CloseHandle(pi.hProcess);
5091 CloseHandle(pi.hThread);
5093 return (int)exit_code;
5094 } else {
5095 return -1;
5096 }
5097 }
5099 //--------------------------------------------------------------------------------------------------
5100 // Non-product code
5102 static int mallocDebugIntervalCounter = 0;
5103 static int mallocDebugCounter = 0;
5104 bool os::check_heap(bool force) {
5105 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5106 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5107 // Note: HeapValidate executes two hardware breakpoints when it finds something
5108 // wrong; at these points, eax contains the address of the offending block (I think).
5109 // To get to the exlicit error message(s) below, just continue twice.
5110 HANDLE heap = GetProcessHeap();
5111 { HeapLock(heap);
5112 PROCESS_HEAP_ENTRY phe;
5113 phe.lpData = NULL;
5114 while (HeapWalk(heap, &phe) != 0) {
5115 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5116 !HeapValidate(heap, 0, phe.lpData)) {
5117 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5118 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5119 fatal("corrupted C heap");
5120 }
5121 }
5122 DWORD err = GetLastError();
5123 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5124 fatal(err_msg("heap walk aborted with error %d", err));
5125 }
5126 HeapUnlock(heap);
5127 }
5128 mallocDebugIntervalCounter = 0;
5129 }
5130 return true;
5131 }
5134 bool os::find(address addr, outputStream* st) {
5135 // Nothing yet
5136 return false;
5137 }
5139 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5140 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5142 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5143 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5144 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5145 address addr = (address) exceptionRecord->ExceptionInformation[1];
5147 if (os::is_memory_serialize_page(thread, addr))
5148 return EXCEPTION_CONTINUE_EXECUTION;
5149 }
5151 return EXCEPTION_CONTINUE_SEARCH;
5152 }
5154 // We don't build a headless jre for Windows
5155 bool os::is_headless_jre() { return false; }
5157 static jint initSock() {
5158 WSADATA wsadata;
5160 if (!os::WinSock2Dll::WinSock2Available()) {
5161 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5162 ::GetLastError());
5163 return JNI_ERR;
5164 }
5166 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5167 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5168 ::GetLastError());
5169 return JNI_ERR;
5170 }
5171 return JNI_OK;
5172 }
5174 struct hostent* os::get_host_by_name(char* name) {
5175 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5176 }
5178 int os::socket_close(int fd) {
5179 return ::closesocket(fd);
5180 }
5182 int os::socket_available(int fd, jint *pbytes) {
5183 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5184 return (ret < 0) ? 0 : 1;
5185 }
5187 int os::socket(int domain, int type, int protocol) {
5188 return ::socket(domain, type, protocol);
5189 }
5191 int os::listen(int fd, int count) {
5192 return ::listen(fd, count);
5193 }
5195 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5196 return ::connect(fd, him, len);
5197 }
5199 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5200 return ::accept(fd, him, len);
5201 }
5203 int os::sendto(int fd, char* buf, size_t len, uint flags,
5204 struct sockaddr* to, socklen_t tolen) {
5206 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5207 }
5209 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5210 sockaddr* from, socklen_t* fromlen) {
5212 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5213 }
5215 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5216 return ::recv(fd, buf, (int)nBytes, flags);
5217 }
5219 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5220 return ::send(fd, buf, (int)nBytes, flags);
5221 }
5223 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5224 return ::send(fd, buf, (int)nBytes, flags);
5225 }
5227 int os::timeout(int fd, long timeout) {
5228 fd_set tbl;
5229 struct timeval t;
5231 t.tv_sec = timeout / 1000;
5232 t.tv_usec = (timeout % 1000) * 1000;
5234 tbl.fd_count = 1;
5235 tbl.fd_array[0] = fd;
5237 return ::select(1, &tbl, 0, 0, &t);
5238 }
5240 int os::get_host_name(char* name, int namelen) {
5241 return ::gethostname(name, namelen);
5242 }
5244 int os::socket_shutdown(int fd, int howto) {
5245 return ::shutdown(fd, howto);
5246 }
5248 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5249 return ::bind(fd, him, len);
5250 }
5252 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5253 return ::getsockname(fd, him, len);
5254 }
5256 int os::get_sock_opt(int fd, int level, int optname,
5257 char* optval, socklen_t* optlen) {
5258 return ::getsockopt(fd, level, optname, optval, optlen);
5259 }
5261 int os::set_sock_opt(int fd, int level, int optname,
5262 const char* optval, socklen_t optlen) {
5263 return ::setsockopt(fd, level, optname, optval, optlen);
5264 }
5266 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5267 #if defined(IA32)
5268 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5269 #elif defined (AMD64)
5270 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5271 #endif
5273 // returns true if thread could be suspended,
5274 // false otherwise
5275 static bool do_suspend(HANDLE* h) {
5276 if (h != NULL) {
5277 if (SuspendThread(*h) != ~0) {
5278 return true;
5279 }
5280 }
5281 return false;
5282 }
5284 // resume the thread
5285 // calling resume on an active thread is a no-op
5286 static void do_resume(HANDLE* h) {
5287 if (h != NULL) {
5288 ResumeThread(*h);
5289 }
5290 }
5292 // retrieve a suspend/resume context capable handle
5293 // from the tid. Caller validates handle return value.
5294 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5295 if (h != NULL) {
5296 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5297 }
5298 }
5300 //
5301 // Thread sampling implementation
5302 //
5303 void os::SuspendedThreadTask::internal_do_task() {
5304 CONTEXT ctxt;
5305 HANDLE h = NULL;
5307 // get context capable handle for thread
5308 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5310 // sanity
5311 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5312 return;
5313 }
5315 // suspend the thread
5316 if (do_suspend(&h)) {
5317 ctxt.ContextFlags = sampling_context_flags;
5318 // get thread context
5319 GetThreadContext(h, &ctxt);
5320 SuspendedThreadTaskContext context(_thread, &ctxt);
5321 // pass context to Thread Sampling impl
5322 do_task(context);
5323 // resume thread
5324 do_resume(&h);
5325 }
5327 // close handle
5328 CloseHandle(h);
5329 }
5332 // Kernel32 API
5333 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5334 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5335 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5336 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5337 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5339 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5340 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5341 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5342 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5343 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5346 BOOL os::Kernel32Dll::initialized = FALSE;
5347 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5348 assert(initialized && _GetLargePageMinimum != NULL,
5349 "GetLargePageMinimumAvailable() not yet called");
5350 return _GetLargePageMinimum();
5351 }
5353 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5354 if (!initialized) {
5355 initialize();
5356 }
5357 return _GetLargePageMinimum != NULL;
5358 }
5360 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5361 if (!initialized) {
5362 initialize();
5363 }
5364 return _VirtualAllocExNuma != NULL;
5365 }
5367 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5368 assert(initialized && _VirtualAllocExNuma != NULL,
5369 "NUMACallsAvailable() not yet called");
5371 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5372 }
5374 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5375 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5376 "NUMACallsAvailable() not yet called");
5378 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5379 }
5381 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5382 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5383 "NUMACallsAvailable() not yet called");
5385 return _GetNumaNodeProcessorMask(node, proc_mask);
5386 }
5388 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5389 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5390 if (!initialized) {
5391 initialize();
5392 }
5394 if (_RtlCaptureStackBackTrace != NULL) {
5395 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5396 BackTrace, BackTraceHash);
5397 } else {
5398 return 0;
5399 }
5400 }
5402 void os::Kernel32Dll::initializeCommon() {
5403 if (!initialized) {
5404 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5405 assert(handle != NULL, "Just check");
5406 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5407 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5408 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5409 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5410 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5411 initialized = TRUE;
5412 }
5413 }
5417 #ifndef JDK6_OR_EARLIER
5419 void os::Kernel32Dll::initialize() {
5420 initializeCommon();
5421 }
5424 // Kernel32 API
5425 inline BOOL os::Kernel32Dll::SwitchToThread() {
5426 return ::SwitchToThread();
5427 }
5429 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5430 return true;
5431 }
5433 // Help tools
5434 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5435 return true;
5436 }
5438 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5439 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5440 }
5442 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5443 return ::Module32First(hSnapshot, lpme);
5444 }
5446 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5447 return ::Module32Next(hSnapshot, lpme);
5448 }
5450 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5451 ::GetNativeSystemInfo(lpSystemInfo);
5452 }
5454 // PSAPI API
5455 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5456 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5457 }
5459 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5460 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5461 }
5463 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5464 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5465 }
5467 inline BOOL os::PSApiDll::PSApiAvailable() {
5468 return true;
5469 }
5472 // WinSock2 API
5473 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5474 return ::WSAStartup(wVersionRequested, lpWSAData);
5475 }
5477 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5478 return ::gethostbyname(name);
5479 }
5481 inline BOOL os::WinSock2Dll::WinSock2Available() {
5482 return true;
5483 }
5485 // Advapi API
5486 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5487 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5488 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5489 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5490 BufferLength, PreviousState, ReturnLength);
5491 }
5493 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5494 PHANDLE TokenHandle) {
5495 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5496 }
5498 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5499 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5500 }
5502 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5503 return true;
5504 }
5506 void* os::get_default_process_handle() {
5507 return (void*)GetModuleHandle(NULL);
5508 }
5510 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5511 // which is used to find statically linked in agents.
5512 // Additionally for windows, takes into account __stdcall names.
5513 // Parameters:
5514 // sym_name: Symbol in library we are looking for
5515 // lib_name: Name of library to look in, NULL for shared libs.
5516 // is_absolute_path == true if lib_name is absolute path to agent
5517 // such as "C:/a/b/L.dll"
5518 // == false if only the base name of the library is passed in
5519 // such as "L"
5520 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5521 bool is_absolute_path) {
5522 char *agent_entry_name;
5523 size_t len;
5524 size_t name_len;
5525 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5526 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5527 const char *start;
5529 if (lib_name != NULL) {
5530 len = name_len = strlen(lib_name);
5531 if (is_absolute_path) {
5532 // Need to strip path, prefix and suffix
5533 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5534 lib_name = ++start;
5535 } else {
5536 // Need to check for drive prefix
5537 if ((start = strchr(lib_name, ':')) != NULL) {
5538 lib_name = ++start;
5539 }
5540 }
5541 if (len <= (prefix_len + suffix_len)) {
5542 return NULL;
5543 }
5544 lib_name += prefix_len;
5545 name_len = strlen(lib_name) - suffix_len;
5546 }
5547 }
5548 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5549 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5550 if (agent_entry_name == NULL) {
5551 return NULL;
5552 }
5553 if (lib_name != NULL) {
5554 const char *p = strrchr(sym_name, '@');
5555 if (p != NULL && p != sym_name) {
5556 // sym_name == _Agent_OnLoad@XX
5557 strncpy(agent_entry_name, sym_name, (p - sym_name));
5558 agent_entry_name[(p-sym_name)] = '\0';
5559 // agent_entry_name == _Agent_OnLoad
5560 strcat(agent_entry_name, "_");
5561 strncat(agent_entry_name, lib_name, name_len);
5562 strcat(agent_entry_name, p);
5563 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5564 } else {
5565 strcpy(agent_entry_name, sym_name);
5566 strcat(agent_entry_name, "_");
5567 strncat(agent_entry_name, lib_name, name_len);
5568 }
5569 } else {
5570 strcpy(agent_entry_name, sym_name);
5571 }
5572 return agent_entry_name;
5573 }
5575 #else
5576 // Kernel32 API
5577 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5578 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5579 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5580 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5581 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5583 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5584 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5585 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5586 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5587 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5589 void os::Kernel32Dll::initialize() {
5590 if (!initialized) {
5591 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5592 assert(handle != NULL, "Just check");
5594 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5595 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5596 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5597 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5598 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5599 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5600 initializeCommon(); // resolve the functions that always need resolving
5602 initialized = TRUE;
5603 }
5604 }
5606 BOOL os::Kernel32Dll::SwitchToThread() {
5607 assert(initialized && _SwitchToThread != NULL,
5608 "SwitchToThreadAvailable() not yet called");
5609 return _SwitchToThread();
5610 }
5613 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5614 if (!initialized) {
5615 initialize();
5616 }
5617 return _SwitchToThread != NULL;
5618 }
5620 // Help tools
5621 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5622 if (!initialized) {
5623 initialize();
5624 }
5625 return _CreateToolhelp32Snapshot != NULL &&
5626 _Module32First != NULL &&
5627 _Module32Next != NULL;
5628 }
5630 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5631 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5632 "HelpToolsAvailable() not yet called");
5634 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5635 }
5637 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5638 assert(initialized && _Module32First != NULL,
5639 "HelpToolsAvailable() not yet called");
5641 return _Module32First(hSnapshot, lpme);
5642 }
5644 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5645 assert(initialized && _Module32Next != NULL,
5646 "HelpToolsAvailable() not yet called");
5648 return _Module32Next(hSnapshot, lpme);
5649 }
5652 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5653 if (!initialized) {
5654 initialize();
5655 }
5656 return _GetNativeSystemInfo != NULL;
5657 }
5659 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5660 assert(initialized && _GetNativeSystemInfo != NULL,
5661 "GetNativeSystemInfoAvailable() not yet called");
5663 _GetNativeSystemInfo(lpSystemInfo);
5664 }
5666 // PSAPI API
5669 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5670 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5671 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5673 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5674 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5675 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5676 BOOL os::PSApiDll::initialized = FALSE;
5678 void os::PSApiDll::initialize() {
5679 if (!initialized) {
5680 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5681 if (handle != NULL) {
5682 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5683 "EnumProcessModules");
5684 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5685 "GetModuleFileNameExA");
5686 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5687 "GetModuleInformation");
5688 }
5689 initialized = TRUE;
5690 }
5691 }
5695 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5696 assert(initialized && _EnumProcessModules != NULL,
5697 "PSApiAvailable() not yet called");
5698 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5699 }
5701 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5702 assert(initialized && _GetModuleFileNameEx != NULL,
5703 "PSApiAvailable() not yet called");
5704 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5705 }
5707 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5708 assert(initialized && _GetModuleInformation != NULL,
5709 "PSApiAvailable() not yet called");
5710 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5711 }
5713 BOOL os::PSApiDll::PSApiAvailable() {
5714 if (!initialized) {
5715 initialize();
5716 }
5717 return _EnumProcessModules != NULL &&
5718 _GetModuleFileNameEx != NULL &&
5719 _GetModuleInformation != NULL;
5720 }
5723 // WinSock2 API
5724 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5725 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5727 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5728 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5729 BOOL os::WinSock2Dll::initialized = FALSE;
5731 void os::WinSock2Dll::initialize() {
5732 if (!initialized) {
5733 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5734 if (handle != NULL) {
5735 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5736 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5737 }
5738 initialized = TRUE;
5739 }
5740 }
5743 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5744 assert(initialized && _WSAStartup != NULL,
5745 "WinSock2Available() not yet called");
5746 return _WSAStartup(wVersionRequested, lpWSAData);
5747 }
5749 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5750 assert(initialized && _gethostbyname != NULL,
5751 "WinSock2Available() not yet called");
5752 return _gethostbyname(name);
5753 }
5755 BOOL os::WinSock2Dll::WinSock2Available() {
5756 if (!initialized) {
5757 initialize();
5758 }
5759 return _WSAStartup != NULL &&
5760 _gethostbyname != NULL;
5761 }
5763 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5764 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5765 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5767 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5768 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5769 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5770 BOOL os::Advapi32Dll::initialized = FALSE;
5772 void os::Advapi32Dll::initialize() {
5773 if (!initialized) {
5774 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5775 if (handle != NULL) {
5776 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5777 "AdjustTokenPrivileges");
5778 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5779 "OpenProcessToken");
5780 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5781 "LookupPrivilegeValueA");
5782 }
5783 initialized = TRUE;
5784 }
5785 }
5787 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5788 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5789 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5790 assert(initialized && _AdjustTokenPrivileges != NULL,
5791 "AdvapiAvailable() not yet called");
5792 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5793 BufferLength, PreviousState, ReturnLength);
5794 }
5796 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5797 PHANDLE TokenHandle) {
5798 assert(initialized && _OpenProcessToken != NULL,
5799 "AdvapiAvailable() not yet called");
5800 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5801 }
5803 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5804 assert(initialized && _LookupPrivilegeValue != NULL,
5805 "AdvapiAvailable() not yet called");
5806 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5807 }
5809 BOOL os::Advapi32Dll::AdvapiAvailable() {
5810 if (!initialized) {
5811 initialize();
5812 }
5813 return _AdjustTokenPrivileges != NULL &&
5814 _OpenProcessToken != NULL &&
5815 _LookupPrivilegeValue != NULL;
5816 }
5818 #endif
5820 #ifndef PRODUCT
5822 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5823 // contiguous memory block at a particular address.
5824 // The test first tries to find a good approximate address to allocate at by using the same
5825 // method to allocate some memory at any address. The test then tries to allocate memory in
5826 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5827 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5828 // the previously allocated memory is available for allocation. The only actual failure
5829 // that is reported is when the test tries to allocate at a particular location but gets a
5830 // different valid one. A NULL return value at this point is not considered an error but may
5831 // be legitimate.
5832 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5833 void TestReserveMemorySpecial_test() {
5834 if (!UseLargePages) {
5835 if (VerboseInternalVMTests) {
5836 gclog_or_tty->print("Skipping test because large pages are disabled");
5837 }
5838 return;
5839 }
5840 // save current value of globals
5841 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5842 bool old_use_numa_interleaving = UseNUMAInterleaving;
5844 // set globals to make sure we hit the correct code path
5845 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5847 // do an allocation at an address selected by the OS to get a good one.
5848 const size_t large_allocation_size = os::large_page_size() * 4;
5849 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5850 if (result == NULL) {
5851 if (VerboseInternalVMTests) {
5852 gclog_or_tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5853 large_allocation_size);
5854 }
5855 } else {
5856 os::release_memory_special(result, large_allocation_size);
5858 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5859 // we managed to get it once.
5860 const size_t expected_allocation_size = os::large_page_size();
5861 char* expected_location = result + os::large_page_size();
5862 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5863 if (actual_location == NULL) {
5864 if (VerboseInternalVMTests) {
5865 gclog_or_tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5866 expected_location, large_allocation_size);
5867 }
5868 } else {
5869 // release memory
5870 os::release_memory_special(actual_location, expected_allocation_size);
5871 // only now check, after releasing any memory to avoid any leaks.
5872 assert(actual_location == expected_location,
5873 err_msg("Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5874 expected_location, expected_allocation_size, actual_location));
5875 }
5876 }
5878 // restore globals
5879 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5880 UseNUMAInterleaving = old_use_numa_interleaving;
5881 }
5882 #endif // PRODUCT