1 /*
2 * Copyright (c) 1997, 2018, 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 */
24
25 // Must be at least Windows Vista or Server 2008 to use InitOnceExecuteOnce
26 #define _WIN32_WINNT 0x0600
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/disassembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "os_windows.inline.hpp"
44 #include "prims/jniFastGetField.hpp"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/atomic.hpp"
48 #include "runtime/extendedPC.hpp"
49 #include "runtime/globals.hpp"
50 #include "runtime/interfaceSupport.inline.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/mutexLocker.hpp"
54 #include "runtime/objectMonitor.hpp"
55 #include "runtime/orderAccess.inline.hpp"
56 #include "runtime/osThread.hpp"
57 #include "runtime/perfMemory.hpp"
58 #include "runtime/sharedRuntime.hpp"
59 #include "runtime/statSampler.hpp"
60 #include "runtime/stubRoutines.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/threadCritical.hpp"
63 #include "runtime/timer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/memTracker.hpp"
67 #include "services/runtimeService.hpp"
68 #include "utilities/align.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/vmError.hpp"
75 #include "symbolengine.hpp"
76 #include "windbghelp.hpp"
77
78
79 #ifdef _DEBUG
80 #include <crtdbg.h>
81 #endif
82
83
84 #include <windows.h>
85 #include <sys/types.h>
86 #include <sys/stat.h>
87 #include <sys/timeb.h>
88 #include <objidl.h>
89 #include <shlobj.h>
90
91 #include <malloc.h>
92 #include <signal.h>
93 #include <direct.h>
94 #include <errno.h>
95 #include <fcntl.h>
96 #include <io.h>
97 #include <process.h> // For _beginthreadex(), _endthreadex()
98 #include <imagehlp.h> // For os::dll_address_to_function_name
99 // for enumerating dll libraries
100 #include <vdmdbg.h>
101 #include <psapi.h>
102 #include <mmsystem.h>
103 #include <winsock2.h>
104
105 // for timer info max values which include all bits
106 #define ALL_64_BITS CONST64(-1)
107
108 // For DLL loading/load error detection
109 // Values of PE COFF
110 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
111 #define IMAGE_FILE_SIGNATURE_LENGTH 4
112
113 static HANDLE main_process;
114 static HANDLE main_thread;
115 static int main_thread_id;
116
117 static FILETIME process_creation_time;
118 static FILETIME process_exit_time;
119 static FILETIME process_user_time;
120 static FILETIME process_kernel_time;
121
122 #ifdef _M_AMD64
123 #define __CPU__ amd64
124 #else
125 #define __CPU__ i486
126 #endif
127
128 // save DLL module handle, used by GetModuleFileName
129
130 HINSTANCE vm_lib_handle;
131
132 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
133 switch (reason) {
134 case DLL_PROCESS_ATTACH:
135 vm_lib_handle = hinst;
136 if (ForceTimeHighResolution) {
137 timeBeginPeriod(1L);
138 }
139 WindowsDbgHelp::pre_initialize();
140 SymbolEngine::pre_initialize();
141 break;
142 case DLL_PROCESS_DETACH:
143 if (ForceTimeHighResolution) {
144 timeEndPeriod(1L);
145 }
146 break;
147 default:
148 break;
149 }
150 return true;
151 }
152
153 static inline double fileTimeAsDouble(FILETIME* time) {
154 const double high = (double) ((unsigned int) ~0);
155 const double split = 10000000.0;
156 double result = (time->dwLowDateTime / split) +
157 time->dwHighDateTime * (high/split);
158 return result;
159 }
160
161 // Implementation of os
162
163 bool os::unsetenv(const char* name) {
164 assert(name != NULL, "Null pointer");
165 return (SetEnvironmentVariable(name, NULL) == TRUE);
166 }
167
168 // No setuid programs under Windows.
169 bool os::have_special_privileges() {
170 return false;
171 }
172
173
174 // This method is a periodic task to check for misbehaving JNI applications
175 // under CheckJNI, we can add any periodic checks here.
176 // For Windows at the moment does nothing
177 void os::run_periodic_checks() {
178 return;
179 }
180
181 // previous UnhandledExceptionFilter, if there is one
182 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
183
184 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
185
186 void os::init_system_properties_values() {
187 // sysclasspath, java_home, dll_dir
188 {
189 char *home_path;
190 char *dll_path;
191 char *pslash;
192 char *bin = "\\bin";
193 char home_dir[MAX_PATH + 1];
194 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
195
196 if (alt_home_dir != NULL) {
197 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
198 home_dir[MAX_PATH] = '\0';
199 } else {
200 os::jvm_path(home_dir, sizeof(home_dir));
201 // Found the full path to jvm.dll.
202 // Now cut the path to <java_home>/jre if we can.
203 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
204 pslash = strrchr(home_dir, '\\');
205 if (pslash != NULL) {
206 *pslash = '\0'; // get rid of \{client|server}
207 pslash = strrchr(home_dir, '\\');
208 if (pslash != NULL) {
209 *pslash = '\0'; // get rid of \bin
210 }
211 }
212 }
213
214 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
215 if (home_path == NULL) {
216 return;
217 }
218 strcpy(home_path, home_dir);
219 Arguments::set_java_home(home_path);
220 FREE_C_HEAP_ARRAY(char, home_path);
221
222 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
223 mtInternal);
224 if (dll_path == NULL) {
225 return;
226 }
227 strcpy(dll_path, home_dir);
228 strcat(dll_path, bin);
229 Arguments::set_dll_dir(dll_path);
230 FREE_C_HEAP_ARRAY(char, dll_path);
231
232 if (!set_boot_path('\\', ';')) {
233 return;
234 }
235 }
236
237 // library_path
238 #define EXT_DIR "\\lib\\ext"
239 #define BIN_DIR "\\bin"
240 #define PACKAGE_DIR "\\Sun\\Java"
241 {
242 // Win32 library search order (See the documentation for LoadLibrary):
243 //
244 // 1. The directory from which application is loaded.
245 // 2. The system wide Java Extensions directory (Java only)
246 // 3. System directory (GetSystemDirectory)
247 // 4. Windows directory (GetWindowsDirectory)
248 // 5. The PATH environment variable
249 // 6. The current directory
250
251 char *library_path;
252 char tmp[MAX_PATH];
253 char *path_str = ::getenv("PATH");
254
255 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
256 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
257
258 library_path[0] = '\0';
259
260 GetModuleFileName(NULL, tmp, sizeof(tmp));
261 *(strrchr(tmp, '\\')) = '\0';
262 strcat(library_path, tmp);
263
264 GetWindowsDirectory(tmp, sizeof(tmp));
265 strcat(library_path, ";");
266 strcat(library_path, tmp);
267 strcat(library_path, PACKAGE_DIR BIN_DIR);
268
269 GetSystemDirectory(tmp, sizeof(tmp));
270 strcat(library_path, ";");
271 strcat(library_path, tmp);
272
273 GetWindowsDirectory(tmp, sizeof(tmp));
274 strcat(library_path, ";");
275 strcat(library_path, tmp);
276
277 if (path_str) {
278 strcat(library_path, ";");
279 strcat(library_path, path_str);
280 }
281
282 strcat(library_path, ";.");
283
284 Arguments::set_library_path(library_path);
285 FREE_C_HEAP_ARRAY(char, library_path);
286 }
287
288 // Default extensions directory
289 {
290 char path[MAX_PATH];
291 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
292 GetWindowsDirectory(path, MAX_PATH);
293 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
294 path, PACKAGE_DIR, EXT_DIR);
295 Arguments::set_ext_dirs(buf);
296 }
297 #undef EXT_DIR
298 #undef BIN_DIR
299 #undef PACKAGE_DIR
300
301 #ifndef _WIN64
302 // set our UnhandledExceptionFilter and save any previous one
303 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
304 #endif
305
306 // Done
307 return;
308 }
309
310 void os::breakpoint() {
311 DebugBreak();
312 }
313
314 // Invoked from the BREAKPOINT Macro
315 extern "C" void breakpoint() {
316 os::breakpoint();
317 }
318
319 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
320 // So far, this method is only used by Native Memory Tracking, which is
321 // only supported on Windows XP or later.
322 //
323 int os::get_native_stack(address* stack, int frames, int toSkip) {
324 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
325 for (int index = captured; index < frames; index ++) {
326 stack[index] = NULL;
327 }
328 return captured;
329 }
330
331
332 // os::current_stack_base()
333 //
334 // Returns the base of the stack, which is the stack's
335 // starting address. This function must be called
336 // while running on the stack of the thread being queried.
337
338 address os::current_stack_base() {
339 MEMORY_BASIC_INFORMATION minfo;
340 address stack_bottom;
341 size_t stack_size;
342
343 VirtualQuery(&minfo, &minfo, sizeof(minfo));
344 stack_bottom = (address)minfo.AllocationBase;
345 stack_size = minfo.RegionSize;
346
347 // Add up the sizes of all the regions with the same
348 // AllocationBase.
349 while (1) {
350 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
351 if (stack_bottom == (address)minfo.AllocationBase) {
352 stack_size += minfo.RegionSize;
353 } else {
354 break;
355 }
356 }
357 return stack_bottom + stack_size;
358 }
359
360 size_t os::current_stack_size() {
361 size_t sz;
362 MEMORY_BASIC_INFORMATION minfo;
363 VirtualQuery(&minfo, &minfo, sizeof(minfo));
364 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
365 return sz;
366 }
367
368 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
369 MEMORY_BASIC_INFORMATION minfo;
370 committed_start = NULL;
371 committed_size = 0;
372 address top = start + size;
373 const address start_addr = start;
374 while (start < top) {
375 VirtualQuery(start, &minfo, sizeof(minfo));
376 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
377 if (committed_start != NULL) {
378 break;
379 }
380 } else { // committed
381 if (committed_start == NULL) {
382 committed_start = start;
383 }
384 size_t offset = start - (address)minfo.BaseAddress;
385 committed_size += minfo.RegionSize - offset;
386 }
387 start = (address)minfo.BaseAddress + minfo.RegionSize;
388 }
389
390 if (committed_start == NULL) {
391 assert(committed_size == 0, "Sanity");
392 return false;
393 } else {
394 assert(committed_start >= start_addr && committed_start < top, "Out of range");
395 // current region may go beyond the limit, trim to the limit
396 committed_size = MIN2(committed_size, size_t(top - committed_start));
397 return true;
398 }
399 }
400
401 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
402 const struct tm* time_struct_ptr = localtime(clock);
403 if (time_struct_ptr != NULL) {
404 *res = *time_struct_ptr;
405 return res;
406 }
407 return NULL;
408 }
409
410 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
411 const struct tm* time_struct_ptr = gmtime(clock);
412 if (time_struct_ptr != NULL) {
413 *res = *time_struct_ptr;
414 return res;
415 }
416 return NULL;
417 }
418
419 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
420
421 // Thread start routine for all newly created threads
422 static unsigned __stdcall thread_native_entry(Thread* thread) {
423 // Try to randomize the cache line index of hot stack frames.
424 // This helps when threads of the same stack traces evict each other's
425 // cache lines. The threads can be either from the same JVM instance, or
426 // from different JVM instances. The benefit is especially true for
427 // processors with hyperthreading technology.
428 static int counter = 0;
429 int pid = os::current_process_id();
430 _alloca(((pid ^ counter++) & 7) * 128);
431
432 thread->initialize_thread_current();
433
434 OSThread* osthr = thread->osthread();
435 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
436
437 if (UseNUMA) {
438 int lgrp_id = os::numa_get_group_id();
439 if (lgrp_id != -1) {
440 thread->set_lgrp_id(lgrp_id);
441 }
442 }
443
444 // Diagnostic code to investigate JDK-6573254
445 int res = 30115; // non-java thread
446 if (thread->is_Java_thread()) {
447 res = 20115; // java thread
448 }
449
450 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
451
452 // Install a win32 structured exception handler around every thread created
453 // by VM, so VM can generate error dump when an exception occurred in non-
454 // Java thread (e.g. VM thread).
455 __try {
456 thread->run();
457 } __except(topLevelExceptionFilter(
458 (_EXCEPTION_POINTERS*)_exception_info())) {
459 // Nothing to do.
460 }
461
462 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
463
464 // One less thread is executing
465 // When the VMThread gets here, the main thread may have already exited
466 // which frees the CodeHeap containing the Atomic::add code
467 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
468 Atomic::dec(&os::win32::_os_thread_count);
469 }
470
471 // If a thread has not deleted itself ("delete this") as part of its
472 // termination sequence, we have to ensure thread-local-storage is
473 // cleared before we actually terminate. No threads should ever be
474 // deleted asynchronously with respect to their termination.
475 if (Thread::current_or_null_safe() != NULL) {
476 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
477 thread->clear_thread_current();
478 }
479
480 // Thread must not return from exit_process_or_thread(), but if it does,
481 // let it proceed to exit normally
482 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
483 }
484
485 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
486 int thread_id) {
487 // Allocate the OSThread object
488 OSThread* osthread = new OSThread(NULL, NULL);
489 if (osthread == NULL) return NULL;
490
491 // Initialize support for Java interrupts
492 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
493 if (interrupt_event == NULL) {
494 delete osthread;
495 return NULL;
496 }
497 osthread->set_interrupt_event(interrupt_event);
498
499 // Store info on the Win32 thread into the OSThread
500 osthread->set_thread_handle(thread_handle);
501 osthread->set_thread_id(thread_id);
502
503 if (UseNUMA) {
504 int lgrp_id = os::numa_get_group_id();
505 if (lgrp_id != -1) {
506 thread->set_lgrp_id(lgrp_id);
507 }
508 }
509
510 // Initial thread state is INITIALIZED, not SUSPENDED
511 osthread->set_state(INITIALIZED);
512
513 return osthread;
514 }
515
516
517 bool os::create_attached_thread(JavaThread* thread) {
518 #ifdef ASSERT
519 thread->verify_not_published();
520 #endif
521 HANDLE thread_h;
522 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
523 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
524 fatal("DuplicateHandle failed\n");
525 }
526 OSThread* osthread = create_os_thread(thread, thread_h,
527 (int)current_thread_id());
528 if (osthread == NULL) {
529 return false;
530 }
531
532 // Initial thread state is RUNNABLE
533 osthread->set_state(RUNNABLE);
534
535 thread->set_osthread(osthread);
536
537 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
538 os::current_thread_id());
539
540 return true;
541 }
542
543 bool os::create_main_thread(JavaThread* thread) {
544 #ifdef ASSERT
545 thread->verify_not_published();
546 #endif
547 if (_starting_thread == NULL) {
548 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
549 if (_starting_thread == NULL) {
550 return false;
551 }
552 }
553
554 // The primordial thread is runnable from the start)
555 _starting_thread->set_state(RUNNABLE);
556
557 thread->set_osthread(_starting_thread);
558 return true;
559 }
560
561 // Helper function to trace _beginthreadex attributes,
562 // similar to os::Posix::describe_pthread_attr()
563 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
564 size_t stacksize, unsigned initflag) {
565 stringStream ss(buf, buflen);
566 if (stacksize == 0) {
567 ss.print("stacksize: default, ");
568 } else {
569 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
570 }
571 ss.print("flags: ");
572 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
573 #define ALL(X) \
574 X(CREATE_SUSPENDED) \
575 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
576 ALL(PRINT_FLAG)
577 #undef ALL
578 #undef PRINT_FLAG
579 return buf;
580 }
581
582 // Allocate and initialize a new OSThread
583 bool os::create_thread(Thread* thread, ThreadType thr_type,
584 size_t stack_size) {
585 unsigned thread_id;
586
587 // Allocate the OSThread object
588 OSThread* osthread = new OSThread(NULL, NULL);
589 if (osthread == NULL) {
590 return false;
591 }
592
593 // Initialize support for Java interrupts
594 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
595 if (interrupt_event == NULL) {
596 delete osthread;
597 return NULL;
598 }
599 osthread->set_interrupt_event(interrupt_event);
600 osthread->set_interrupted(false);
601
602 thread->set_osthread(osthread);
603
604 if (stack_size == 0) {
605 switch (thr_type) {
606 case os::java_thread:
607 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
608 if (JavaThread::stack_size_at_create() > 0) {
609 stack_size = JavaThread::stack_size_at_create();
610 }
611 break;
612 case os::compiler_thread:
613 if (CompilerThreadStackSize > 0) {
614 stack_size = (size_t)(CompilerThreadStackSize * K);
615 break;
616 } // else fall through:
617 // use VMThreadStackSize if CompilerThreadStackSize is not defined
618 case os::vm_thread:
619 case os::pgc_thread:
620 case os::cgc_thread:
621 case os::watcher_thread:
622 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
623 break;
624 }
625 }
626
627 // Create the Win32 thread
628 //
629 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
630 // does not specify stack size. Instead, it specifies the size of
631 // initially committed space. The stack size is determined by
632 // PE header in the executable. If the committed "stack_size" is larger
633 // than default value in the PE header, the stack is rounded up to the
634 // nearest multiple of 1MB. For example if the launcher has default
635 // stack size of 320k, specifying any size less than 320k does not
636 // affect the actual stack size at all, it only affects the initial
637 // commitment. On the other hand, specifying 'stack_size' larger than
638 // default value may cause significant increase in memory usage, because
639 // not only the stack space will be rounded up to MB, but also the
640 // entire space is committed upfront.
641 //
642 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
643 // for CreateThread() that can treat 'stack_size' as stack size. However we
644 // are not supposed to call CreateThread() directly according to MSDN
645 // document because JVM uses C runtime library. The good news is that the
646 // flag appears to work with _beginthredex() as well.
647
648 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
649 HANDLE thread_handle =
650 (HANDLE)_beginthreadex(NULL,
651 (unsigned)stack_size,
652 (unsigned (__stdcall *)(void*)) thread_native_entry,
653 thread,
654 initflag,
655 &thread_id);
656
657 char buf[64];
658 if (thread_handle != NULL) {
659 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
660 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
661 } else {
662 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
663 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
664 }
665
666 if (thread_handle == NULL) {
667 // Need to clean up stuff we've allocated so far
668 CloseHandle(osthread->interrupt_event());
669 thread->set_osthread(NULL);
670 delete osthread;
671 return NULL;
672 }
673
674 Atomic::inc(&os::win32::_os_thread_count);
675
676 // Store info on the Win32 thread into the OSThread
677 osthread->set_thread_handle(thread_handle);
678 osthread->set_thread_id(thread_id);
679
680 // Initial thread state is INITIALIZED, not SUSPENDED
681 osthread->set_state(INITIALIZED);
682
683 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
684 return true;
685 }
686
687
688 // Free Win32 resources related to the OSThread
689 void os::free_thread(OSThread* osthread) {
690 assert(osthread != NULL, "osthread not set");
691
692 // We are told to free resources of the argument thread,
693 // but we can only really operate on the current thread.
694 assert(Thread::current()->osthread() == osthread,
695 "os::free_thread but not current thread");
696
697 CloseHandle(osthread->thread_handle());
698 CloseHandle(osthread->interrupt_event());
699 delete osthread;
700 }
701
702 static jlong first_filetime;
703 static jlong initial_performance_count;
704 static jlong performance_frequency;
705
706
707 jlong as_long(LARGE_INTEGER x) {
708 jlong result = 0; // initialization to avoid warning
709 set_high(&result, x.HighPart);
710 set_low(&result, x.LowPart);
711 return result;
712 }
713
714
715 jlong os::elapsed_counter() {
716 LARGE_INTEGER count;
717 QueryPerformanceCounter(&count);
718 return as_long(count) - initial_performance_count;
719 }
720
721
722 jlong os::elapsed_frequency() {
723 return performance_frequency;
724 }
725
726
727 julong os::available_memory() {
728 return win32::available_memory();
729 }
730
731 julong os::win32::available_memory() {
732 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
733 // value if total memory is larger than 4GB
734 MEMORYSTATUSEX ms;
735 ms.dwLength = sizeof(ms);
736 GlobalMemoryStatusEx(&ms);
737
738 return (julong)ms.ullAvailPhys;
739 }
740
741 julong os::physical_memory() {
742 return win32::physical_memory();
743 }
744
745 bool os::has_allocatable_memory_limit(julong* limit) {
746 MEMORYSTATUSEX ms;
747 ms.dwLength = sizeof(ms);
748 GlobalMemoryStatusEx(&ms);
749 #ifdef _LP64
750 *limit = (julong)ms.ullAvailVirtual;
751 return true;
752 #else
753 // Limit to 1400m because of the 2gb address space wall
754 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
755 return true;
756 #endif
757 }
758
759 int os::active_processor_count() {
760 // User has overridden the number of active processors
761 if (ActiveProcessorCount > 0) {
762 log_trace(os)("active_processor_count: "
763 "active processor count set by user : %d",
764 ActiveProcessorCount);
765 return ActiveProcessorCount;
766 }
767
768 DWORD_PTR lpProcessAffinityMask = 0;
769 DWORD_PTR lpSystemAffinityMask = 0;
770 int proc_count = processor_count();
771 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
772 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
773 // Nof active processors is number of bits in process affinity mask
774 int bitcount = 0;
775 while (lpProcessAffinityMask != 0) {
776 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
777 bitcount++;
778 }
779 return bitcount;
780 } else {
781 return proc_count;
782 }
783 }
784
785 void os::set_native_thread_name(const char *name) {
786
787 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
788 //
789 // Note that unfortunately this only works if the process
790 // is already attached to a debugger; debugger must observe
791 // the exception below to show the correct name.
792
793 // If there is no debugger attached skip raising the exception
794 if (!IsDebuggerPresent()) {
795 return;
796 }
797
798 const DWORD MS_VC_EXCEPTION = 0x406D1388;
799 struct {
800 DWORD dwType; // must be 0x1000
801 LPCSTR szName; // pointer to name (in user addr space)
802 DWORD dwThreadID; // thread ID (-1=caller thread)
803 DWORD dwFlags; // reserved for future use, must be zero
804 } info;
805
806 info.dwType = 0x1000;
807 info.szName = name;
808 info.dwThreadID = -1;
809 info.dwFlags = 0;
810
811 __try {
812 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
813 } __except(EXCEPTION_EXECUTE_HANDLER) {}
814 }
815
816 bool os::distribute_processes(uint length, uint* distribution) {
817 // Not yet implemented.
818 return false;
819 }
820
821 bool os::bind_to_processor(uint processor_id) {
822 // Not yet implemented.
823 return false;
824 }
825
826 void os::win32::initialize_performance_counter() {
827 LARGE_INTEGER count;
828 QueryPerformanceFrequency(&count);
829 performance_frequency = as_long(count);
830 QueryPerformanceCounter(&count);
831 initial_performance_count = as_long(count);
832 }
833
834
835 double os::elapsedTime() {
836 return (double) elapsed_counter() / (double) elapsed_frequency();
837 }
838
839
840 // Windows format:
841 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
842 // Java format:
843 // Java standards require the number of milliseconds since 1/1/1970
844
845 // Constant offset - calculated using offset()
846 static jlong _offset = 116444736000000000;
847 // Fake time counter for reproducible results when debugging
848 static jlong fake_time = 0;
849
850 #ifdef ASSERT
851 // Just to be safe, recalculate the offset in debug mode
852 static jlong _calculated_offset = 0;
853 static int _has_calculated_offset = 0;
854
855 jlong offset() {
856 if (_has_calculated_offset) return _calculated_offset;
857 SYSTEMTIME java_origin;
858 java_origin.wYear = 1970;
859 java_origin.wMonth = 1;
860 java_origin.wDayOfWeek = 0; // ignored
861 java_origin.wDay = 1;
862 java_origin.wHour = 0;
863 java_origin.wMinute = 0;
864 java_origin.wSecond = 0;
865 java_origin.wMilliseconds = 0;
866 FILETIME jot;
867 if (!SystemTimeToFileTime(&java_origin, &jot)) {
868 fatal("Error = %d\nWindows error", GetLastError());
869 }
870 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
871 _has_calculated_offset = 1;
872 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
873 return _calculated_offset;
874 }
875 #else
876 jlong offset() {
877 return _offset;
878 }
879 #endif
880
881 jlong windows_to_java_time(FILETIME wt) {
882 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
883 return (a - offset()) / 10000;
884 }
885
886 // Returns time ticks in (10th of micro seconds)
887 jlong windows_to_time_ticks(FILETIME wt) {
888 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
889 return (a - offset());
890 }
891
892 FILETIME java_to_windows_time(jlong l) {
893 jlong a = (l * 10000) + offset();
894 FILETIME result;
895 result.dwHighDateTime = high(a);
896 result.dwLowDateTime = low(a);
897 return result;
898 }
899
900 bool os::supports_vtime() { return true; }
901 bool os::enable_vtime() { return false; }
902 bool os::vtime_enabled() { return false; }
903
904 double os::elapsedVTime() {
905 FILETIME created;
906 FILETIME exited;
907 FILETIME kernel;
908 FILETIME user;
909 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
910 // the resolution of windows_to_java_time() should be sufficient (ms)
911 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
912 } else {
913 return elapsedTime();
914 }
915 }
916
917 jlong os::javaTimeMillis() {
918 if (UseFakeTimers) {
919 return fake_time++;
920 } else {
921 FILETIME wt;
922 GetSystemTimeAsFileTime(&wt);
923 return windows_to_java_time(wt);
924 }
925 }
926
927 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
928 FILETIME wt;
929 GetSystemTimeAsFileTime(&wt);
930 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
931 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
932 seconds = secs;
933 nanos = jlong(ticks - (secs*10000000)) * 100;
934 }
935
936 jlong os::javaTimeNanos() {
937 LARGE_INTEGER current_count;
938 QueryPerformanceCounter(¤t_count);
939 double current = as_long(current_count);
940 double freq = performance_frequency;
941 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
942 return time;
943 }
944
945 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
946 jlong freq = performance_frequency;
947 if (freq < NANOSECS_PER_SEC) {
948 // the performance counter is 64 bits and we will
949 // be multiplying it -- so no wrap in 64 bits
950 info_ptr->max_value = ALL_64_BITS;
951 } else if (freq > NANOSECS_PER_SEC) {
952 // use the max value the counter can reach to
953 // determine the max value which could be returned
954 julong max_counter = (julong)ALL_64_BITS;
955 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
956 } else {
957 // the performance counter is 64 bits and we will
958 // be using it directly -- so no wrap in 64 bits
959 info_ptr->max_value = ALL_64_BITS;
960 }
961
962 // using a counter, so no skipping
963 info_ptr->may_skip_backward = false;
964 info_ptr->may_skip_forward = false;
965
966 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
967 }
968
969 char* os::local_time_string(char *buf, size_t buflen) {
970 SYSTEMTIME st;
971 GetLocalTime(&st);
972 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
973 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
974 return buf;
975 }
976
977 bool os::getTimesSecs(double* process_real_time,
978 double* process_user_time,
979 double* process_system_time) {
980 HANDLE h_process = GetCurrentProcess();
981 FILETIME create_time, exit_time, kernel_time, user_time;
982 BOOL result = GetProcessTimes(h_process,
983 &create_time,
984 &exit_time,
985 &kernel_time,
986 &user_time);
987 if (result != 0) {
988 FILETIME wt;
989 GetSystemTimeAsFileTime(&wt);
990 jlong rtc_millis = windows_to_java_time(wt);
991 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
992 *process_user_time =
993 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
994 *process_system_time =
995 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
996 return true;
997 } else {
998 return false;
999 }
1000 }
1001
1002 void os::shutdown() {
1003 // allow PerfMemory to attempt cleanup of any persistent resources
1004 perfMemory_exit();
1005
1006 // flush buffered output, finish log files
1007 ostream_abort();
1008
1009 // Check for abort hook
1010 abort_hook_t abort_hook = Arguments::abort_hook();
1011 if (abort_hook != NULL) {
1012 abort_hook();
1013 }
1014 }
1015
1016
1017 static HANDLE dumpFile = NULL;
1018
1019 // Check if dump file can be created.
1020 void os::check_dump_limit(char* buffer, size_t buffsz) {
1021 bool status = true;
1022 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1023 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1024 status = false;
1025 }
1026
1027 #ifndef ASSERT
1028 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1029 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1030 status = false;
1031 }
1032 #endif
1033
1034 if (status) {
1035 const char* cwd = get_current_directory(NULL, 0);
1036 int pid = current_process_id();
1037 if (cwd != NULL) {
1038 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1039 } else {
1040 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1041 }
1042
1043 if (dumpFile == NULL &&
1044 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1045 == INVALID_HANDLE_VALUE) {
1046 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1047 status = false;
1048 }
1049 }
1050 VMError::record_coredump_status(buffer, status);
1051 }
1052
1053 void os::abort(bool dump_core, void* siginfo, const void* context) {
1054 EXCEPTION_POINTERS ep;
1055 MINIDUMP_EXCEPTION_INFORMATION mei;
1056 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1057
1058 HANDLE hProcess = GetCurrentProcess();
1059 DWORD processId = GetCurrentProcessId();
1060 MINIDUMP_TYPE dumpType;
1061
1062 shutdown();
1063 if (!dump_core || dumpFile == NULL) {
1064 if (dumpFile != NULL) {
1065 CloseHandle(dumpFile);
1066 }
1067 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1068 }
1069
1070 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1071 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1072
1073 if (siginfo != NULL && context != NULL) {
1074 ep.ContextRecord = (PCONTEXT) context;
1075 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1076
1077 mei.ThreadId = GetCurrentThreadId();
1078 mei.ExceptionPointers = &ep;
1079 pmei = &mei;
1080 } else {
1081 pmei = NULL;
1082 }
1083
1084 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1085 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1086 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1087 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1088 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1089 }
1090 CloseHandle(dumpFile);
1091 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1092 }
1093
1094 // Die immediately, no exit hook, no abort hook, no cleanup.
1095 void os::die() {
1096 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1097 }
1098
1099 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1100 // * dirent_md.c 1.15 00/02/02
1101 //
1102 // The declarations for DIR and struct dirent are in jvm_win32.h.
1103
1104 // Caller must have already run dirname through JVM_NativePath, which removes
1105 // duplicate slashes and converts all instances of '/' into '\\'.
1106
1107 DIR * os::opendir(const char *dirname) {
1108 assert(dirname != NULL, "just checking"); // hotspot change
1109 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1110 DWORD fattr; // hotspot change
1111 char alt_dirname[4] = { 0, 0, 0, 0 };
1112
1113 if (dirp == 0) {
1114 errno = ENOMEM;
1115 return 0;
1116 }
1117
1118 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1119 // as a directory in FindFirstFile(). We detect this case here and
1120 // prepend the current drive name.
1121 //
1122 if (dirname[1] == '\0' && dirname[0] == '\\') {
1123 alt_dirname[0] = _getdrive() + 'A' - 1;
1124 alt_dirname[1] = ':';
1125 alt_dirname[2] = '\\';
1126 alt_dirname[3] = '\0';
1127 dirname = alt_dirname;
1128 }
1129
1130 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1131 if (dirp->path == 0) {
1132 free(dirp);
1133 errno = ENOMEM;
1134 return 0;
1135 }
1136 strcpy(dirp->path, dirname);
1137
1138 fattr = GetFileAttributes(dirp->path);
1139 if (fattr == 0xffffffff) {
1140 free(dirp->path);
1141 free(dirp);
1142 errno = ENOENT;
1143 return 0;
1144 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1145 free(dirp->path);
1146 free(dirp);
1147 errno = ENOTDIR;
1148 return 0;
1149 }
1150
1151 // Append "*.*", or possibly "\\*.*", to path
1152 if (dirp->path[1] == ':' &&
1153 (dirp->path[2] == '\0' ||
1154 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1155 // No '\\' needed for cases like "Z:" or "Z:\"
1156 strcat(dirp->path, "*.*");
1157 } else {
1158 strcat(dirp->path, "\\*.*");
1159 }
1160
1161 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1162 if (dirp->handle == INVALID_HANDLE_VALUE) {
1163 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1164 free(dirp->path);
1165 free(dirp);
1166 errno = EACCES;
1167 return 0;
1168 }
1169 }
1170 return dirp;
1171 }
1172
1173 // parameter dbuf unused on Windows
1174 struct dirent * os::readdir(DIR *dirp, dirent *dbuf) {
1175 assert(dirp != NULL, "just checking"); // hotspot change
1176 if (dirp->handle == INVALID_HANDLE_VALUE) {
1177 return 0;
1178 }
1179
1180 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1181
1182 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1183 if (GetLastError() == ERROR_INVALID_HANDLE) {
1184 errno = EBADF;
1185 return 0;
1186 }
1187 FindClose(dirp->handle);
1188 dirp->handle = INVALID_HANDLE_VALUE;
1189 }
1190
1191 return &dirp->dirent;
1192 }
1193
1194 int os::closedir(DIR *dirp) {
1195 assert(dirp != NULL, "just checking"); // hotspot change
1196 if (dirp->handle != INVALID_HANDLE_VALUE) {
1197 if (!FindClose(dirp->handle)) {
1198 errno = EBADF;
1199 return -1;
1200 }
1201 dirp->handle = INVALID_HANDLE_VALUE;
1202 }
1203 free(dirp->path);
1204 free(dirp);
1205 return 0;
1206 }
1207
1208 // This must be hard coded because it's the system's temporary
1209 // directory not the java application's temp directory, ala java.io.tmpdir.
1210 const char* os::get_temp_directory() {
1211 static char path_buf[MAX_PATH];
1212 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1213 return path_buf;
1214 } else {
1215 path_buf[0] = '\0';
1216 return path_buf;
1217 }
1218 }
1219
1220 // Needs to be in os specific directory because windows requires another
1221 // header file <direct.h>
1222 const char* os::get_current_directory(char *buf, size_t buflen) {
1223 int n = static_cast<int>(buflen);
1224 if (buflen > INT_MAX) n = INT_MAX;
1225 return _getcwd(buf, n);
1226 }
1227
1228 //-----------------------------------------------------------
1229 // Helper functions for fatal error handler
1230 #ifdef _WIN64
1231 // Helper routine which returns true if address in
1232 // within the NTDLL address space.
1233 //
1234 static bool _addr_in_ntdll(address addr) {
1235 HMODULE hmod;
1236 MODULEINFO minfo;
1237
1238 hmod = GetModuleHandle("NTDLL.DLL");
1239 if (hmod == NULL) return false;
1240 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1241 &minfo, sizeof(MODULEINFO))) {
1242 return false;
1243 }
1244
1245 if ((addr >= minfo.lpBaseOfDll) &&
1246 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1247 return true;
1248 } else {
1249 return false;
1250 }
1251 }
1252 #endif
1253
1254 struct _modinfo {
1255 address addr;
1256 char* full_path; // point to a char buffer
1257 int buflen; // size of the buffer
1258 address base_addr;
1259 };
1260
1261 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1262 address top_address, void * param) {
1263 struct _modinfo *pmod = (struct _modinfo *)param;
1264 if (!pmod) return -1;
1265
1266 if (base_addr <= pmod->addr &&
1267 top_address > pmod->addr) {
1268 // if a buffer is provided, copy path name to the buffer
1269 if (pmod->full_path) {
1270 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1271 }
1272 pmod->base_addr = base_addr;
1273 return 1;
1274 }
1275 return 0;
1276 }
1277
1278 bool os::dll_address_to_library_name(address addr, char* buf,
1279 int buflen, int* offset) {
1280 // buf is not optional, but offset is optional
1281 assert(buf != NULL, "sanity check");
1282
1283 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1284 // return the full path to the DLL file, sometimes it returns path
1285 // to the corresponding PDB file (debug info); sometimes it only
1286 // returns partial path, which makes life painful.
1287
1288 struct _modinfo mi;
1289 mi.addr = addr;
1290 mi.full_path = buf;
1291 mi.buflen = buflen;
1292 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1293 // buf already contains path name
1294 if (offset) *offset = addr - mi.base_addr;
1295 return true;
1296 }
1297
1298 buf[0] = '\0';
1299 if (offset) *offset = -1;
1300 return false;
1301 }
1302
1303 bool os::dll_address_to_function_name(address addr, char *buf,
1304 int buflen, int *offset,
1305 bool demangle) {
1306 // buf is not optional, but offset is optional
1307 assert(buf != NULL, "sanity check");
1308
1309 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1310 return true;
1311 }
1312 if (offset != NULL) *offset = -1;
1313 buf[0] = '\0';
1314 return false;
1315 }
1316
1317 // save the start and end address of jvm.dll into param[0] and param[1]
1318 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1319 address top_address, void * param) {
1320 if (!param) return -1;
1321
1322 if (base_addr <= (address)_locate_jvm_dll &&
1323 top_address > (address)_locate_jvm_dll) {
1324 ((address*)param)[0] = base_addr;
1325 ((address*)param)[1] = top_address;
1326 return 1;
1327 }
1328 return 0;
1329 }
1330
1331 address vm_lib_location[2]; // start and end address of jvm.dll
1332
1333 // check if addr is inside jvm.dll
1334 bool os::address_is_in_vm(address addr) {
1335 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1336 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1337 assert(false, "Can't find jvm module.");
1338 return false;
1339 }
1340 }
1341
1342 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1343 }
1344
1345 // print module info; param is outputStream*
1346 static int _print_module(const char* fname, address base_address,
1347 address top_address, void* param) {
1348 if (!param) return -1;
1349
1350 outputStream* st = (outputStream*)param;
1351
1352 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1353 return 0;
1354 }
1355
1356 // Loads .dll/.so and
1357 // in case of error it checks if .dll/.so was built for the
1358 // same architecture as Hotspot is running on
1359 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1360 void * result = LoadLibrary(name);
1361 if (result != NULL) {
1362 // Recalculate pdb search path if a DLL was loaded successfully.
1363 SymbolEngine::recalc_search_path();
1364 return result;
1365 }
1366
1367 DWORD errcode = GetLastError();
1368 if (errcode == ERROR_MOD_NOT_FOUND) {
1369 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1370 ebuf[ebuflen - 1] = '\0';
1371 return NULL;
1372 }
1373
1374 // Parsing dll below
1375 // If we can read dll-info and find that dll was built
1376 // for an architecture other than Hotspot is running in
1377 // - then print to buffer "DLL was built for a different architecture"
1378 // else call os::lasterror to obtain system error message
1379
1380 // Read system error message into ebuf
1381 // It may or may not be overwritten below (in the for loop and just above)
1382 lasterror(ebuf, (size_t) ebuflen);
1383 ebuf[ebuflen - 1] = '\0';
1384 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1385 if (fd < 0) {
1386 return NULL;
1387 }
1388
1389 uint32_t signature_offset;
1390 uint16_t lib_arch = 0;
1391 bool failed_to_get_lib_arch =
1392 ( // Go to position 3c in the dll
1393 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1394 ||
1395 // Read location of signature
1396 (sizeof(signature_offset) !=
1397 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1398 ||
1399 // Go to COFF File Header in dll
1400 // that is located after "signature" (4 bytes long)
1401 (os::seek_to_file_offset(fd,
1402 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1403 ||
1404 // Read field that contains code of architecture
1405 // that dll was built for
1406 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1407 );
1408
1409 ::close(fd);
1410 if (failed_to_get_lib_arch) {
1411 // file i/o error - report os::lasterror(...) msg
1412 return NULL;
1413 }
1414
1415 typedef struct {
1416 uint16_t arch_code;
1417 char* arch_name;
1418 } arch_t;
1419
1420 static const arch_t arch_array[] = {
1421 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1422 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1423 };
1424 #if (defined _M_AMD64)
1425 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1426 #elif (defined _M_IX86)
1427 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1428 #else
1429 #error Method os::dll_load requires that one of following \
1430 is defined :_M_AMD64 or _M_IX86
1431 #endif
1432
1433
1434 // Obtain a string for printf operation
1435 // lib_arch_str shall contain string what platform this .dll was built for
1436 // running_arch_str shall string contain what platform Hotspot was built for
1437 char *running_arch_str = NULL, *lib_arch_str = NULL;
1438 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1439 if (lib_arch == arch_array[i].arch_code) {
1440 lib_arch_str = arch_array[i].arch_name;
1441 }
1442 if (running_arch == arch_array[i].arch_code) {
1443 running_arch_str = arch_array[i].arch_name;
1444 }
1445 }
1446
1447 assert(running_arch_str,
1448 "Didn't find running architecture code in arch_array");
1449
1450 // If the architecture is right
1451 // but some other error took place - report os::lasterror(...) msg
1452 if (lib_arch == running_arch) {
1453 return NULL;
1454 }
1455
1456 if (lib_arch_str != NULL) {
1457 ::_snprintf(ebuf, ebuflen - 1,
1458 "Can't load %s-bit .dll on a %s-bit platform",
1459 lib_arch_str, running_arch_str);
1460 } else {
1461 // don't know what architecture this dll was build for
1462 ::_snprintf(ebuf, ebuflen - 1,
1463 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1464 lib_arch, running_arch_str);
1465 }
1466
1467 return NULL;
1468 }
1469
1470 void os::print_dll_info(outputStream *st) {
1471 st->print_cr("Dynamic libraries:");
1472 get_loaded_modules_info(_print_module, (void *)st);
1473 }
1474
1475 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1476 HANDLE hProcess;
1477
1478 # define MAX_NUM_MODULES 128
1479 HMODULE modules[MAX_NUM_MODULES];
1480 static char filename[MAX_PATH];
1481 int result = 0;
1482
1483 int pid = os::current_process_id();
1484 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1485 FALSE, pid);
1486 if (hProcess == NULL) return 0;
1487
1488 DWORD size_needed;
1489 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1490 CloseHandle(hProcess);
1491 return 0;
1492 }
1493
1494 // number of modules that are currently loaded
1495 int num_modules = size_needed / sizeof(HMODULE);
1496
1497 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1498 // Get Full pathname:
1499 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1500 filename[0] = '\0';
1501 }
1502
1503 MODULEINFO modinfo;
1504 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1505 modinfo.lpBaseOfDll = NULL;
1506 modinfo.SizeOfImage = 0;
1507 }
1508
1509 // Invoke callback function
1510 result = callback(filename, (address)modinfo.lpBaseOfDll,
1511 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1512 if (result) break;
1513 }
1514
1515 CloseHandle(hProcess);
1516 return result;
1517 }
1518
1519 bool os::get_host_name(char* buf, size_t buflen) {
1520 DWORD size = (DWORD)buflen;
1521 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1522 }
1523
1524 void os::get_summary_os_info(char* buf, size_t buflen) {
1525 stringStream sst(buf, buflen);
1526 os::win32::print_windows_version(&sst);
1527 // chop off newline character
1528 char* nl = strchr(buf, '\n');
1529 if (nl != NULL) *nl = '\0';
1530 }
1531
1532 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1533 #if _MSC_VER >= 1900
1534 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1535 int result = ::vsnprintf(buf, len, fmt, args);
1536 // If an encoding error occurred (result < 0) then it's not clear
1537 // whether the buffer is NUL terminated, so ensure it is.
1538 if ((result < 0) && (len > 0)) {
1539 buf[len - 1] = '\0';
1540 }
1541 return result;
1542 #else
1543 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1544 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1545 // versions. However, when len == 0, avoid _vsnprintf too, and just
1546 // go straight to _vscprintf. The output is going to be truncated in
1547 // that case, except in the unusual case of empty output. More
1548 // importantly, the documentation for various versions of Visual Studio
1549 // are inconsistent about the behavior of _vsnprintf when len == 0,
1550 // including it possibly being an error.
1551 int result = -1;
1552 if (len > 0) {
1553 result = _vsnprintf(buf, len, fmt, args);
1554 // If output (including NUL terminator) is truncated, the buffer
1555 // won't be NUL terminated. Add the trailing NUL specified by C99.
1556 if ((result < 0) || ((size_t)result >= len)) {
1557 buf[len - 1] = '\0';
1558 }
1559 }
1560 if (result < 0) {
1561 result = _vscprintf(fmt, args);
1562 }
1563 return result;
1564 #endif // _MSC_VER dispatch
1565 }
1566
1567 static inline time_t get_mtime(const char* filename) {
1568 struct stat st;
1569 int ret = os::stat(filename, &st);
1570 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1571 return st.st_mtime;
1572 }
1573
1574 int os::compare_file_modified_times(const char* file1, const char* file2) {
1575 time_t t1 = get_mtime(file1);
1576 time_t t2 = get_mtime(file2);
1577 return t1 - t2;
1578 }
1579
1580 void os::print_os_info_brief(outputStream* st) {
1581 os::print_os_info(st);
1582 }
1583
1584 void os::print_os_info(outputStream* st) {
1585 #ifdef ASSERT
1586 char buffer[1024];
1587 st->print("HostName: ");
1588 if (get_host_name(buffer, sizeof(buffer))) {
1589 st->print("%s ", buffer);
1590 } else {
1591 st->print("N/A ");
1592 }
1593 #endif
1594 st->print("OS:");
1595 os::win32::print_windows_version(st);
1596 }
1597
1598 void os::win32::print_windows_version(outputStream* st) {
1599 OSVERSIONINFOEX osvi;
1600 VS_FIXEDFILEINFO *file_info;
1601 TCHAR kernel32_path[MAX_PATH];
1602 UINT len, ret;
1603
1604 // Use the GetVersionEx information to see if we're on a server or
1605 // workstation edition of Windows. Starting with Windows 8.1 we can't
1606 // trust the OS version information returned by this API.
1607 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1608 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1609 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1610 st->print_cr("Call to GetVersionEx failed");
1611 return;
1612 }
1613 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1614
1615 // Get the full path to \Windows\System32\kernel32.dll and use that for
1616 // determining what version of Windows we're running on.
1617 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1618 ret = GetSystemDirectory(kernel32_path, len);
1619 if (ret == 0 || ret > len) {
1620 st->print_cr("Call to GetSystemDirectory failed");
1621 return;
1622 }
1623 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1624
1625 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1626 if (version_size == 0) {
1627 st->print_cr("Call to GetFileVersionInfoSize failed");
1628 return;
1629 }
1630
1631 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1632 if (version_info == NULL) {
1633 st->print_cr("Failed to allocate version_info");
1634 return;
1635 }
1636
1637 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1638 os::free(version_info);
1639 st->print_cr("Call to GetFileVersionInfo failed");
1640 return;
1641 }
1642
1643 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1644 os::free(version_info);
1645 st->print_cr("Call to VerQueryValue failed");
1646 return;
1647 }
1648
1649 int major_version = HIWORD(file_info->dwProductVersionMS);
1650 int minor_version = LOWORD(file_info->dwProductVersionMS);
1651 int build_number = HIWORD(file_info->dwProductVersionLS);
1652 int build_minor = LOWORD(file_info->dwProductVersionLS);
1653 int os_vers = major_version * 1000 + minor_version;
1654 os::free(version_info);
1655
1656 st->print(" Windows ");
1657 switch (os_vers) {
1658
1659 case 6000:
1660 if (is_workstation) {
1661 st->print("Vista");
1662 } else {
1663 st->print("Server 2008");
1664 }
1665 break;
1666
1667 case 6001:
1668 if (is_workstation) {
1669 st->print("7");
1670 } else {
1671 st->print("Server 2008 R2");
1672 }
1673 break;
1674
1675 case 6002:
1676 if (is_workstation) {
1677 st->print("8");
1678 } else {
1679 st->print("Server 2012");
1680 }
1681 break;
1682
1683 case 6003:
1684 if (is_workstation) {
1685 st->print("8.1");
1686 } else {
1687 st->print("Server 2012 R2");
1688 }
1689 break;
1690
1691 case 10000:
1692 if (is_workstation) {
1693 st->print("10");
1694 } else {
1695 st->print("Server 2016");
1696 }
1697 break;
1698
1699 default:
1700 // Unrecognized windows, print out its major and minor versions
1701 st->print("%d.%d", major_version, minor_version);
1702 break;
1703 }
1704
1705 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1706 // find out whether we are running on 64 bit processor or not
1707 SYSTEM_INFO si;
1708 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1709 GetNativeSystemInfo(&si);
1710 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1711 st->print(" , 64 bit");
1712 }
1713
1714 st->print(" Build %d", build_number);
1715 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1716 st->cr();
1717 }
1718
1719 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1720 // Nothing to do for now.
1721 }
1722
1723 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1724 HKEY key;
1725 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1726 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1727 if (status == ERROR_SUCCESS) {
1728 DWORD size = (DWORD)buflen;
1729 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1730 if (status != ERROR_SUCCESS) {
1731 strncpy(buf, "## __CPU__", buflen);
1732 }
1733 RegCloseKey(key);
1734 } else {
1735 // Put generic cpu info to return
1736 strncpy(buf, "## __CPU__", buflen);
1737 }
1738 }
1739
1740 void os::print_memory_info(outputStream* st) {
1741 st->print("Memory:");
1742 st->print(" %dk page", os::vm_page_size()>>10);
1743
1744 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1745 // value if total memory is larger than 4GB
1746 MEMORYSTATUSEX ms;
1747 ms.dwLength = sizeof(ms);
1748 GlobalMemoryStatusEx(&ms);
1749
1750 st->print(", physical %uk", os::physical_memory() >> 10);
1751 st->print("(%uk free)", os::available_memory() >> 10);
1752
1753 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1754 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1755 st->cr();
1756 }
1757
1758 void os::print_siginfo(outputStream *st, const void* siginfo) {
1759 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1760 st->print("siginfo:");
1761
1762 char tmp[64];
1763 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1764 strcpy(tmp, "EXCEPTION_??");
1765 }
1766 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1767
1768 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1769 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1770 er->NumberParameters >= 2) {
1771 switch (er->ExceptionInformation[0]) {
1772 case 0: st->print(", reading address"); break;
1773 case 1: st->print(", writing address"); break;
1774 case 8: st->print(", data execution prevention violation at address"); break;
1775 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1776 er->ExceptionInformation[0]);
1777 }
1778 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1779 } else {
1780 int num = er->NumberParameters;
1781 if (num > 0) {
1782 st->print(", ExceptionInformation=");
1783 for (int i = 0; i < num; i++) {
1784 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1785 }
1786 }
1787 }
1788 st->cr();
1789 }
1790
1791 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1792 // do nothing
1793 }
1794
1795 static char saved_jvm_path[MAX_PATH] = {0};
1796
1797 // Find the full path to the current module, jvm.dll
1798 void os::jvm_path(char *buf, jint buflen) {
1799 // Error checking.
1800 if (buflen < MAX_PATH) {
1801 assert(false, "must use a large-enough buffer");
1802 buf[0] = '\0';
1803 return;
1804 }
1805 // Lazy resolve the path to current module.
1806 if (saved_jvm_path[0] != 0) {
1807 strcpy(buf, saved_jvm_path);
1808 return;
1809 }
1810
1811 buf[0] = '\0';
1812 if (Arguments::sun_java_launcher_is_altjvm()) {
1813 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1814 // for a JAVA_HOME environment variable and fix up the path so it
1815 // looks like jvm.dll is installed there (append a fake suffix
1816 // hotspot/jvm.dll).
1817 char* java_home_var = ::getenv("JAVA_HOME");
1818 if (java_home_var != NULL && java_home_var[0] != 0 &&
1819 strlen(java_home_var) < (size_t)buflen) {
1820 strncpy(buf, java_home_var, buflen);
1821
1822 // determine if this is a legacy image or modules image
1823 // modules image doesn't have "jre" subdirectory
1824 size_t len = strlen(buf);
1825 char* jrebin_p = buf + len;
1826 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1827 if (0 != _access(buf, 0)) {
1828 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1829 }
1830 len = strlen(buf);
1831 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1832 }
1833 }
1834
1835 if (buf[0] == '\0') {
1836 GetModuleFileName(vm_lib_handle, buf, buflen);
1837 }
1838 strncpy(saved_jvm_path, buf, MAX_PATH);
1839 saved_jvm_path[MAX_PATH - 1] = '\0';
1840 }
1841
1842
1843 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1844 #ifndef _WIN64
1845 st->print("_");
1846 #endif
1847 }
1848
1849
1850 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1851 #ifndef _WIN64
1852 st->print("@%d", args_size * sizeof(int));
1853 #endif
1854 }
1855
1856 // This method is a copy of JDK's sysGetLastErrorString
1857 // from src/windows/hpi/src/system_md.c
1858
1859 size_t os::lasterror(char* buf, size_t len) {
1860 DWORD errval;
1861
1862 if ((errval = GetLastError()) != 0) {
1863 // DOS error
1864 size_t n = (size_t)FormatMessage(
1865 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1866 NULL,
1867 errval,
1868 0,
1869 buf,
1870 (DWORD)len,
1871 NULL);
1872 if (n > 3) {
1873 // Drop final '.', CR, LF
1874 if (buf[n - 1] == '\n') n--;
1875 if (buf[n - 1] == '\r') n--;
1876 if (buf[n - 1] == '.') n--;
1877 buf[n] = '\0';
1878 }
1879 return n;
1880 }
1881
1882 if (errno != 0) {
1883 // C runtime error that has no corresponding DOS error code
1884 const char* s = os::strerror(errno);
1885 size_t n = strlen(s);
1886 if (n >= len) n = len - 1;
1887 strncpy(buf, s, n);
1888 buf[n] = '\0';
1889 return n;
1890 }
1891
1892 return 0;
1893 }
1894
1895 int os::get_last_error() {
1896 DWORD error = GetLastError();
1897 if (error == 0) {
1898 error = errno;
1899 }
1900 return (int)error;
1901 }
1902
1903 // sun.misc.Signal
1904 // NOTE that this is a workaround for an apparent kernel bug where if
1905 // a signal handler for SIGBREAK is installed then that signal handler
1906 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1907 // See bug 4416763.
1908 static void (*sigbreakHandler)(int) = NULL;
1909
1910 static void UserHandler(int sig, void *siginfo, void *context) {
1911 os::signal_notify(sig);
1912 // We need to reinstate the signal handler each time...
1913 os::signal(sig, (void*)UserHandler);
1914 }
1915
1916 void* os::user_handler() {
1917 return (void*) UserHandler;
1918 }
1919
1920 void* os::signal(int signal_number, void* handler) {
1921 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1922 void (*oldHandler)(int) = sigbreakHandler;
1923 sigbreakHandler = (void (*)(int)) handler;
1924 return (void*) oldHandler;
1925 } else {
1926 return (void*)::signal(signal_number, (void (*)(int))handler);
1927 }
1928 }
1929
1930 void os::signal_raise(int signal_number) {
1931 raise(signal_number);
1932 }
1933
1934 // The Win32 C runtime library maps all console control events other than ^C
1935 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1936 // logoff, and shutdown events. We therefore install our own console handler
1937 // that raises SIGTERM for the latter cases.
1938 //
1939 static BOOL WINAPI consoleHandler(DWORD event) {
1940 switch (event) {
1941 case CTRL_C_EVENT:
1942 if (VMError::is_error_reported()) {
1943 // Ctrl-C is pressed during error reporting, likely because the error
1944 // handler fails to abort. Let VM die immediately.
1945 os::die();
1946 }
1947
1948 os::signal_raise(SIGINT);
1949 return TRUE;
1950 break;
1951 case CTRL_BREAK_EVENT:
1952 if (sigbreakHandler != NULL) {
1953 (*sigbreakHandler)(SIGBREAK);
1954 }
1955 return TRUE;
1956 break;
1957 case CTRL_LOGOFF_EVENT: {
1958 // Don't terminate JVM if it is running in a non-interactive session,
1959 // such as a service process.
1960 USEROBJECTFLAGS flags;
1961 HANDLE handle = GetProcessWindowStation();
1962 if (handle != NULL &&
1963 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
1964 sizeof(USEROBJECTFLAGS), NULL)) {
1965 // If it is a non-interactive session, let next handler to deal
1966 // with it.
1967 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
1968 return FALSE;
1969 }
1970 }
1971 }
1972 case CTRL_CLOSE_EVENT:
1973 case CTRL_SHUTDOWN_EVENT:
1974 os::signal_raise(SIGTERM);
1975 return TRUE;
1976 break;
1977 default:
1978 break;
1979 }
1980 return FALSE;
1981 }
1982
1983 // The following code is moved from os.cpp for making this
1984 // code platform specific, which it is by its very nature.
1985
1986 // Return maximum OS signal used + 1 for internal use only
1987 // Used as exit signal for signal_thread
1988 int os::sigexitnum_pd() {
1989 return NSIG;
1990 }
1991
1992 // a counter for each possible signal value, including signal_thread exit signal
1993 static volatile jint pending_signals[NSIG+1] = { 0 };
1994 static Semaphore* sig_sem = NULL;
1995
1996 void os::signal_init_pd() {
1997 // Initialize signal structures
1998 memset((void*)pending_signals, 0, sizeof(pending_signals));
1999
2000 // Initialize signal semaphore
2001 sig_sem = new Semaphore();
2002
2003 // Programs embedding the VM do not want it to attempt to receive
2004 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2005 // shutdown hooks mechanism introduced in 1.3. For example, when
2006 // the VM is run as part of a Windows NT service (i.e., a servlet
2007 // engine in a web server), the correct behavior is for any console
2008 // control handler to return FALSE, not TRUE, because the OS's
2009 // "final" handler for such events allows the process to continue if
2010 // it is a service (while terminating it if it is not a service).
2011 // To make this behavior uniform and the mechanism simpler, we
2012 // completely disable the VM's usage of these console events if -Xrs
2013 // (=ReduceSignalUsage) is specified. This means, for example, that
2014 // the CTRL-BREAK thread dump mechanism is also disabled in this
2015 // case. See bugs 4323062, 4345157, and related bugs.
2016
2017 if (!ReduceSignalUsage) {
2018 // Add a CTRL-C handler
2019 SetConsoleCtrlHandler(consoleHandler, TRUE);
2020 }
2021 }
2022
2023 void os::signal_notify(int sig) {
2024 if (sig_sem != NULL) {
2025 Atomic::inc(&pending_signals[sig]);
2026 sig_sem->signal();
2027 } else {
2028 // Signal thread is not created with ReduceSignalUsage and signal_init_pd
2029 // initialization isn't called.
2030 assert(ReduceSignalUsage, "signal semaphore should be created");
2031 }
2032 }
2033
2034 static int check_pending_signals() {
2035 while (true) {
2036 for (int i = 0; i < NSIG + 1; i++) {
2037 jint n = pending_signals[i];
2038 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2039 return i;
2040 }
2041 }
2042 JavaThread *thread = JavaThread::current();
2043
2044 ThreadBlockInVM tbivm(thread);
2045
2046 bool threadIsSuspended;
2047 do {
2048 thread->set_suspend_equivalent();
2049 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2050 sig_sem->wait();
2051
2052 // were we externally suspended while we were waiting?
2053 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2054 if (threadIsSuspended) {
2055 // The semaphore has been incremented, but while we were waiting
2056 // another thread suspended us. We don't want to continue running
2057 // while suspended because that would surprise the thread that
2058 // suspended us.
2059 sig_sem->signal();
2060
2061 thread->java_suspend_self();
2062 }
2063 } while (threadIsSuspended);
2064 }
2065 }
2066
2067 int os::signal_wait() {
2068 return check_pending_signals();
2069 }
2070
2071 // Implicit OS exception handling
2072
2073 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2074 address handler) {
2075 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2076 // Save pc in thread
2077 #ifdef _M_AMD64
2078 // Do not blow up if no thread info available.
2079 if (thread) {
2080 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2081 }
2082 // Set pc to handler
2083 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2084 #else
2085 // Do not blow up if no thread info available.
2086 if (thread) {
2087 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2088 }
2089 // Set pc to handler
2090 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2091 #endif
2092
2093 // Continue the execution
2094 return EXCEPTION_CONTINUE_EXECUTION;
2095 }
2096
2097
2098 // Used for PostMortemDump
2099 extern "C" void safepoints();
2100 extern "C" void find(int x);
2101 extern "C" void events();
2102
2103 // According to Windows API documentation, an illegal instruction sequence should generate
2104 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2105 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2106 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2107
2108 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2109
2110 // From "Execution Protection in the Windows Operating System" draft 0.35
2111 // Once a system header becomes available, the "real" define should be
2112 // included or copied here.
2113 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2114
2115 // Windows Vista/2008 heap corruption check
2116 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2117
2118 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2119 // C++ compiler contain this error code. Because this is a compiler-generated
2120 // error, the code is not listed in the Win32 API header files.
2121 // The code is actually a cryptic mnemonic device, with the initial "E"
2122 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2123 // ASCII values of "msc".
2124
2125 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2126
2127 #define def_excpt(val) { #val, (val) }
2128
2129 static const struct { char* name; uint number; } exceptlabels[] = {
2130 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2131 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2132 def_excpt(EXCEPTION_BREAKPOINT),
2133 def_excpt(EXCEPTION_SINGLE_STEP),
2134 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2135 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2136 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2137 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2138 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2139 def_excpt(EXCEPTION_FLT_OVERFLOW),
2140 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2141 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2142 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2143 def_excpt(EXCEPTION_INT_OVERFLOW),
2144 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2145 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2146 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2147 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2148 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2149 def_excpt(EXCEPTION_STACK_OVERFLOW),
2150 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2151 def_excpt(EXCEPTION_GUARD_PAGE),
2152 def_excpt(EXCEPTION_INVALID_HANDLE),
2153 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2154 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2155 };
2156
2157 #undef def_excpt
2158
2159 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2160 uint code = static_cast<uint>(exception_code);
2161 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2162 if (exceptlabels[i].number == code) {
2163 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2164 return buf;
2165 }
2166 }
2167
2168 return NULL;
2169 }
2170
2171 //-----------------------------------------------------------------------------
2172 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2173 // handle exception caused by idiv; should only happen for -MinInt/-1
2174 // (division by zero is handled explicitly)
2175 #ifdef _M_AMD64
2176 PCONTEXT ctx = exceptionInfo->ContextRecord;
2177 address pc = (address)ctx->Rip;
2178 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2179 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2180 if (pc[0] == 0xF7) {
2181 // set correct result values and continue after idiv instruction
2182 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2183 } else {
2184 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2185 }
2186 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2187 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2188 // idiv opcode (0xF7).
2189 ctx->Rdx = (DWORD)0; // remainder
2190 // Continue the execution
2191 #else
2192 PCONTEXT ctx = exceptionInfo->ContextRecord;
2193 address pc = (address)ctx->Eip;
2194 assert(pc[0] == 0xF7, "not an idiv opcode");
2195 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2196 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2197 // set correct result values and continue after idiv instruction
2198 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2199 ctx->Eax = (DWORD)min_jint; // result
2200 ctx->Edx = (DWORD)0; // remainder
2201 // Continue the execution
2202 #endif
2203 return EXCEPTION_CONTINUE_EXECUTION;
2204 }
2205
2206 //-----------------------------------------------------------------------------
2207 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2208 PCONTEXT ctx = exceptionInfo->ContextRecord;
2209 #ifndef _WIN64
2210 // handle exception caused by native method modifying control word
2211 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2212
2213 switch (exception_code) {
2214 case EXCEPTION_FLT_DENORMAL_OPERAND:
2215 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2216 case EXCEPTION_FLT_INEXACT_RESULT:
2217 case EXCEPTION_FLT_INVALID_OPERATION:
2218 case EXCEPTION_FLT_OVERFLOW:
2219 case EXCEPTION_FLT_STACK_CHECK:
2220 case EXCEPTION_FLT_UNDERFLOW:
2221 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2222 if (fp_control_word != ctx->FloatSave.ControlWord) {
2223 // Restore FPCW and mask out FLT exceptions
2224 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2225 // Mask out pending FLT exceptions
2226 ctx->FloatSave.StatusWord &= 0xffffff00;
2227 return EXCEPTION_CONTINUE_EXECUTION;
2228 }
2229 }
2230
2231 if (prev_uef_handler != NULL) {
2232 // We didn't handle this exception so pass it to the previous
2233 // UnhandledExceptionFilter.
2234 return (prev_uef_handler)(exceptionInfo);
2235 }
2236 #else // !_WIN64
2237 // On Windows, the mxcsr control bits are non-volatile across calls
2238 // See also CR 6192333
2239 //
2240 jint MxCsr = INITIAL_MXCSR;
2241 // we can't use StubRoutines::addr_mxcsr_std()
2242 // because in Win64 mxcsr is not saved there
2243 if (MxCsr != ctx->MxCsr) {
2244 ctx->MxCsr = MxCsr;
2245 return EXCEPTION_CONTINUE_EXECUTION;
2246 }
2247 #endif // !_WIN64
2248
2249 return EXCEPTION_CONTINUE_SEARCH;
2250 }
2251
2252 static inline void report_error(Thread* t, DWORD exception_code,
2253 address addr, void* siginfo, void* context) {
2254 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2255
2256 // If UseOsErrorReporting, this will return here and save the error file
2257 // somewhere where we can find it in the minidump.
2258 }
2259
2260 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2261 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2262 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2263 address addr = (address) exceptionRecord->ExceptionInformation[1];
2264 if (Interpreter::contains(pc)) {
2265 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2266 if (!fr->is_first_java_frame()) {
2267 // get_frame_at_stack_banging_point() is only called when we
2268 // have well defined stacks so java_sender() calls do not need
2269 // to assert safe_for_sender() first.
2270 *fr = fr->java_sender();
2271 }
2272 } else {
2273 // more complex code with compiled code
2274 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2275 CodeBlob* cb = CodeCache::find_blob(pc);
2276 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2277 // Not sure where the pc points to, fallback to default
2278 // stack overflow handling
2279 return false;
2280 } else {
2281 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2282 // in compiled code, the stack banging is performed just after the return pc
2283 // has been pushed on the stack
2284 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2285 if (!fr->is_java_frame()) {
2286 // See java_sender() comment above.
2287 *fr = fr->java_sender();
2288 }
2289 }
2290 }
2291 assert(fr->is_java_frame(), "Safety check");
2292 return true;
2293 }
2294
2295 //-----------------------------------------------------------------------------
2296 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2297 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2298 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2299 #ifdef _M_AMD64
2300 address pc = (address) exceptionInfo->ContextRecord->Rip;
2301 #else
2302 address pc = (address) exceptionInfo->ContextRecord->Eip;
2303 #endif
2304 Thread* t = Thread::current_or_null_safe();
2305
2306 // Handle SafeFetch32 and SafeFetchN exceptions.
2307 if (StubRoutines::is_safefetch_fault(pc)) {
2308 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2309 }
2310
2311 #ifndef _WIN64
2312 // Execution protection violation - win32 running on AMD64 only
2313 // Handled first to avoid misdiagnosis as a "normal" access violation;
2314 // This is safe to do because we have a new/unique ExceptionInformation
2315 // code for this condition.
2316 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2317 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2318 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2319 address addr = (address) exceptionRecord->ExceptionInformation[1];
2320
2321 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2322 int page_size = os::vm_page_size();
2323
2324 // Make sure the pc and the faulting address are sane.
2325 //
2326 // If an instruction spans a page boundary, and the page containing
2327 // the beginning of the instruction is executable but the following
2328 // page is not, the pc and the faulting address might be slightly
2329 // different - we still want to unguard the 2nd page in this case.
2330 //
2331 // 15 bytes seems to be a (very) safe value for max instruction size.
2332 bool pc_is_near_addr =
2333 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2334 bool instr_spans_page_boundary =
2335 (align_down((intptr_t) pc ^ (intptr_t) addr,
2336 (intptr_t) page_size) > 0);
2337
2338 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2339 static volatile address last_addr =
2340 (address) os::non_memory_address_word();
2341
2342 // In conservative mode, don't unguard unless the address is in the VM
2343 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2344 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2345
2346 // Set memory to RWX and retry
2347 address page_start = align_down(addr, page_size);
2348 bool res = os::protect_memory((char*) page_start, page_size,
2349 os::MEM_PROT_RWX);
2350
2351 log_debug(os)("Execution protection violation "
2352 "at " INTPTR_FORMAT
2353 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2354 p2i(page_start), (res ? "success" : os::strerror(errno)));
2355
2356 // Set last_addr so if we fault again at the same address, we don't
2357 // end up in an endless loop.
2358 //
2359 // There are two potential complications here. Two threads trapping
2360 // at the same address at the same time could cause one of the
2361 // threads to think it already unguarded, and abort the VM. Likely
2362 // very rare.
2363 //
2364 // The other race involves two threads alternately trapping at
2365 // different addresses and failing to unguard the page, resulting in
2366 // an endless loop. This condition is probably even more unlikely
2367 // than the first.
2368 //
2369 // Although both cases could be avoided by using locks or thread
2370 // local last_addr, these solutions are unnecessary complication:
2371 // this handler is a best-effort safety net, not a complete solution.
2372 // It is disabled by default and should only be used as a workaround
2373 // in case we missed any no-execute-unsafe VM code.
2374
2375 last_addr = addr;
2376
2377 return EXCEPTION_CONTINUE_EXECUTION;
2378 }
2379 }
2380
2381 // Last unguard failed or not unguarding
2382 tty->print_raw_cr("Execution protection violation");
2383 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2384 exceptionInfo->ContextRecord);
2385 return EXCEPTION_CONTINUE_SEARCH;
2386 }
2387 }
2388 #endif // _WIN64
2389
2390 // Check to see if we caught the safepoint code in the
2391 // process of write protecting the memory serialization page.
2392 // It write enables the page immediately after protecting it
2393 // so just return.
2394 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2395 if (t != NULL && t->is_Java_thread()) {
2396 JavaThread* thread = (JavaThread*) t;
2397 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2398 address addr = (address) exceptionRecord->ExceptionInformation[1];
2399 if (os::is_memory_serialize_page(thread, addr)) {
2400 // Block current thread until the memory serialize page permission restored.
2401 os::block_on_serialize_page_trap();
2402 return EXCEPTION_CONTINUE_EXECUTION;
2403 }
2404 }
2405 }
2406
2407 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2408 VM_Version::is_cpuinfo_segv_addr(pc)) {
2409 // Verify that OS save/restore AVX registers.
2410 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2411 }
2412
2413 if (t != NULL && t->is_Java_thread()) {
2414 JavaThread* thread = (JavaThread*) t;
2415 bool in_java = thread->thread_state() == _thread_in_Java;
2416
2417 // Handle potential stack overflows up front.
2418 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2419 if (thread->stack_guards_enabled()) {
2420 if (in_java) {
2421 frame fr;
2422 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2423 address addr = (address) exceptionRecord->ExceptionInformation[1];
2424 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2425 assert(fr.is_java_frame(), "Must be a Java frame");
2426 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2427 }
2428 }
2429 // Yellow zone violation. The o/s has unprotected the first yellow
2430 // zone page for us. Note: must call disable_stack_yellow_zone to
2431 // update the enabled status, even if the zone contains only one page.
2432 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2433 thread->disable_stack_yellow_reserved_zone();
2434 // If not in java code, return and hope for the best.
2435 return in_java
2436 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2437 : EXCEPTION_CONTINUE_EXECUTION;
2438 } else {
2439 // Fatal red zone violation.
2440 thread->disable_stack_red_zone();
2441 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2442 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2443 exceptionInfo->ContextRecord);
2444 return EXCEPTION_CONTINUE_SEARCH;
2445 }
2446 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2447 // Either stack overflow or null pointer exception.
2448 if (in_java) {
2449 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2450 address addr = (address) exceptionRecord->ExceptionInformation[1];
2451 address stack_end = thread->stack_end();
2452 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2453 // Stack overflow.
2454 assert(!os::uses_stack_guard_pages(),
2455 "should be caught by red zone code above.");
2456 return Handle_Exception(exceptionInfo,
2457 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2458 }
2459 // Check for safepoint polling and implicit null
2460 // We only expect null pointers in the stubs (vtable)
2461 // the rest are checked explicitly now.
2462 CodeBlob* cb = CodeCache::find_blob(pc);
2463 if (cb != NULL) {
2464 if (os::is_poll_address(addr)) {
2465 address stub = SharedRuntime::get_poll_stub(pc);
2466 return Handle_Exception(exceptionInfo, stub);
2467 }
2468 }
2469 {
2470 #ifdef _WIN64
2471 // If it's a legal stack address map the entire region in
2472 //
2473 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2474 address addr = (address) exceptionRecord->ExceptionInformation[1];
2475 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2476 addr = (address)((uintptr_t)addr &
2477 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2478 os::commit_memory((char *)addr, thread->stack_base() - addr,
2479 !ExecMem);
2480 return EXCEPTION_CONTINUE_EXECUTION;
2481 } else
2482 #endif
2483 {
2484 // Null pointer exception.
2485 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr)) {
2486 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2487 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2488 }
2489 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2490 exceptionInfo->ContextRecord);
2491 return EXCEPTION_CONTINUE_SEARCH;
2492 }
2493 }
2494 }
2495
2496 #ifdef _WIN64
2497 // Special care for fast JNI field accessors.
2498 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2499 // in and the heap gets shrunk before the field access.
2500 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2501 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2502 if (addr != (address)-1) {
2503 return Handle_Exception(exceptionInfo, addr);
2504 }
2505 }
2506 #endif
2507
2508 // Stack overflow or null pointer exception in native code.
2509 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2510 exceptionInfo->ContextRecord);
2511 return EXCEPTION_CONTINUE_SEARCH;
2512 } // /EXCEPTION_ACCESS_VIOLATION
2513 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2514
2515 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2516 CompiledMethod* nm = NULL;
2517 JavaThread* thread = (JavaThread*)t;
2518 if (in_java) {
2519 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2520 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2521 }
2522 if ((thread->thread_state() == _thread_in_vm &&
2523 thread->doing_unsafe_access()) ||
2524 (nm != NULL && nm->has_unsafe_access())) {
2525 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, (address)Assembler::locate_next_instruction(pc)));
2526 }
2527 }
2528
2529 if (in_java) {
2530 switch (exception_code) {
2531 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2532 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2533
2534 case EXCEPTION_INT_OVERFLOW:
2535 return Handle_IDiv_Exception(exceptionInfo);
2536
2537 } // switch
2538 }
2539 if (((thread->thread_state() == _thread_in_Java) ||
2540 (thread->thread_state() == _thread_in_native)) &&
2541 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2542 LONG result=Handle_FLT_Exception(exceptionInfo);
2543 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2544 }
2545 }
2546
2547 if (exception_code != EXCEPTION_BREAKPOINT) {
2548 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2549 exceptionInfo->ContextRecord);
2550 }
2551 return EXCEPTION_CONTINUE_SEARCH;
2552 }
2553
2554 #ifndef _WIN64
2555 // Special care for fast JNI accessors.
2556 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2557 // the heap gets shrunk before the field access.
2558 // Need to install our own structured exception handler since native code may
2559 // install its own.
2560 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2561 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2562 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2563 address pc = (address) exceptionInfo->ContextRecord->Eip;
2564 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2565 if (addr != (address)-1) {
2566 return Handle_Exception(exceptionInfo, addr);
2567 }
2568 }
2569 return EXCEPTION_CONTINUE_SEARCH;
2570 }
2571
2572 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2573 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2574 jobject obj, \
2575 jfieldID fieldID) { \
2576 __try { \
2577 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2578 obj, \
2579 fieldID); \
2580 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2581 _exception_info())) { \
2582 } \
2583 return 0; \
2584 }
2585
2586 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2587 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2588 DEFINE_FAST_GETFIELD(jchar, char, Char)
2589 DEFINE_FAST_GETFIELD(jshort, short, Short)
2590 DEFINE_FAST_GETFIELD(jint, int, Int)
2591 DEFINE_FAST_GETFIELD(jlong, long, Long)
2592 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2593 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2594
2595 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2596 switch (type) {
2597 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2598 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2599 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2600 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2601 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2602 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2603 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2604 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2605 default: ShouldNotReachHere();
2606 }
2607 return (address)-1;
2608 }
2609 #endif
2610
2611 // Virtual Memory
2612
2613 int os::vm_page_size() { return os::win32::vm_page_size(); }
2614 int os::vm_allocation_granularity() {
2615 return os::win32::vm_allocation_granularity();
2616 }
2617
2618 // Windows large page support is available on Windows 2003. In order to use
2619 // large page memory, the administrator must first assign additional privilege
2620 // to the user:
2621 // + select Control Panel -> Administrative Tools -> Local Security Policy
2622 // + select Local Policies -> User Rights Assignment
2623 // + double click "Lock pages in memory", add users and/or groups
2624 // + reboot
2625 // Note the above steps are needed for administrator as well, as administrators
2626 // by default do not have the privilege to lock pages in memory.
2627 //
2628 // Note about Windows 2003: although the API supports committing large page
2629 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2630 // scenario, I found through experiment it only uses large page if the entire
2631 // memory region is reserved and committed in a single VirtualAlloc() call.
2632 // This makes Windows large page support more or less like Solaris ISM, in
2633 // that the entire heap must be committed upfront. This probably will change
2634 // in the future, if so the code below needs to be revisited.
2635
2636 #ifndef MEM_LARGE_PAGES
2637 #define MEM_LARGE_PAGES 0x20000000
2638 #endif
2639
2640 static HANDLE _hProcess;
2641 static HANDLE _hToken;
2642
2643 // Container for NUMA node list info
2644 class NUMANodeListHolder {
2645 private:
2646 int *_numa_used_node_list; // allocated below
2647 int _numa_used_node_count;
2648
2649 void free_node_list() {
2650 if (_numa_used_node_list != NULL) {
2651 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2652 }
2653 }
2654
2655 public:
2656 NUMANodeListHolder() {
2657 _numa_used_node_count = 0;
2658 _numa_used_node_list = NULL;
2659 // do rest of initialization in build routine (after function pointers are set up)
2660 }
2661
2662 ~NUMANodeListHolder() {
2663 free_node_list();
2664 }
2665
2666 bool build() {
2667 DWORD_PTR proc_aff_mask;
2668 DWORD_PTR sys_aff_mask;
2669 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2670 ULONG highest_node_number;
2671 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2672 free_node_list();
2673 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2674 for (unsigned int i = 0; i <= highest_node_number; i++) {
2675 ULONGLONG proc_mask_numa_node;
2676 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2677 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2678 _numa_used_node_list[_numa_used_node_count++] = i;
2679 }
2680 }
2681 return (_numa_used_node_count > 1);
2682 }
2683
2684 int get_count() { return _numa_used_node_count; }
2685 int get_node_list_entry(int n) {
2686 // for indexes out of range, returns -1
2687 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2688 }
2689
2690 } numa_node_list_holder;
2691
2692
2693
2694 static size_t _large_page_size = 0;
2695
2696 static bool request_lock_memory_privilege() {
2697 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2698 os::current_process_id());
2699
2700 LUID luid;
2701 if (_hProcess != NULL &&
2702 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2703 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2704
2705 TOKEN_PRIVILEGES tp;
2706 tp.PrivilegeCount = 1;
2707 tp.Privileges[0].Luid = luid;
2708 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2709
2710 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2711 // privilege. Check GetLastError() too. See MSDN document.
2712 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2713 (GetLastError() == ERROR_SUCCESS)) {
2714 return true;
2715 }
2716 }
2717
2718 return false;
2719 }
2720
2721 static void cleanup_after_large_page_init() {
2722 if (_hProcess) CloseHandle(_hProcess);
2723 _hProcess = NULL;
2724 if (_hToken) CloseHandle(_hToken);
2725 _hToken = NULL;
2726 }
2727
2728 static bool numa_interleaving_init() {
2729 bool success = false;
2730 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2731
2732 // print a warning if UseNUMAInterleaving flag is specified on command line
2733 bool warn_on_failure = use_numa_interleaving_specified;
2734 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2735
2736 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2737 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2738 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2739
2740 if (numa_node_list_holder.build()) {
2741 if (log_is_enabled(Debug, os, cpu)) {
2742 Log(os, cpu) log;
2743 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2744 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2745 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2746 }
2747 }
2748 success = true;
2749 } else {
2750 WARN("Process does not cover multiple NUMA nodes.");
2751 }
2752 if (!success) {
2753 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2754 }
2755 return success;
2756 #undef WARN
2757 }
2758
2759 // this routine is used whenever we need to reserve a contiguous VA range
2760 // but we need to make separate VirtualAlloc calls for each piece of the range
2761 // Reasons for doing this:
2762 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2763 // * UseNUMAInterleaving requires a separate node for each piece
2764 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2765 DWORD prot,
2766 bool should_inject_error = false) {
2767 char * p_buf;
2768 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2769 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2770 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2771
2772 // first reserve enough address space in advance since we want to be
2773 // able to break a single contiguous virtual address range into multiple
2774 // large page commits but WS2003 does not allow reserving large page space
2775 // so we just use 4K pages for reserve, this gives us a legal contiguous
2776 // address space. then we will deallocate that reservation, and re alloc
2777 // using large pages
2778 const size_t size_of_reserve = bytes + chunk_size;
2779 if (bytes > size_of_reserve) {
2780 // Overflowed.
2781 return NULL;
2782 }
2783 p_buf = (char *) VirtualAlloc(addr,
2784 size_of_reserve, // size of Reserve
2785 MEM_RESERVE,
2786 PAGE_READWRITE);
2787 // If reservation failed, return NULL
2788 if (p_buf == NULL) return NULL;
2789 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2790 os::release_memory(p_buf, bytes + chunk_size);
2791
2792 // we still need to round up to a page boundary (in case we are using large pages)
2793 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2794 // instead we handle this in the bytes_to_rq computation below
2795 p_buf = align_up(p_buf, page_size);
2796
2797 // now go through and allocate one chunk at a time until all bytes are
2798 // allocated
2799 size_t bytes_remaining = bytes;
2800 // An overflow of align_up() would have been caught above
2801 // in the calculation of size_of_reserve.
2802 char * next_alloc_addr = p_buf;
2803 HANDLE hProc = GetCurrentProcess();
2804
2805 #ifdef ASSERT
2806 // Variable for the failure injection
2807 int ran_num = os::random();
2808 size_t fail_after = ran_num % bytes;
2809 #endif
2810
2811 int count=0;
2812 while (bytes_remaining) {
2813 // select bytes_to_rq to get to the next chunk_size boundary
2814
2815 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2816 // Note allocate and commit
2817 char * p_new;
2818
2819 #ifdef ASSERT
2820 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2821 #else
2822 const bool inject_error_now = false;
2823 #endif
2824
2825 if (inject_error_now) {
2826 p_new = NULL;
2827 } else {
2828 if (!UseNUMAInterleaving) {
2829 p_new = (char *) VirtualAlloc(next_alloc_addr,
2830 bytes_to_rq,
2831 flags,
2832 prot);
2833 } else {
2834 // get the next node to use from the used_node_list
2835 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2836 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2837 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2838 }
2839 }
2840
2841 if (p_new == NULL) {
2842 // Free any allocated pages
2843 if (next_alloc_addr > p_buf) {
2844 // Some memory was committed so release it.
2845 size_t bytes_to_release = bytes - bytes_remaining;
2846 // NMT has yet to record any individual blocks, so it
2847 // need to create a dummy 'reserve' record to match
2848 // the release.
2849 MemTracker::record_virtual_memory_reserve((address)p_buf,
2850 bytes_to_release, CALLER_PC);
2851 os::release_memory(p_buf, bytes_to_release);
2852 }
2853 #ifdef ASSERT
2854 if (should_inject_error) {
2855 log_develop_debug(pagesize)("Reserving pages individually failed.");
2856 }
2857 #endif
2858 return NULL;
2859 }
2860
2861 bytes_remaining -= bytes_to_rq;
2862 next_alloc_addr += bytes_to_rq;
2863 count++;
2864 }
2865 // Although the memory is allocated individually, it is returned as one.
2866 // NMT records it as one block.
2867 if ((flags & MEM_COMMIT) != 0) {
2868 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2869 } else {
2870 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2871 }
2872
2873 // made it this far, success
2874 return p_buf;
2875 }
2876
2877
2878
2879 void os::large_page_init() {
2880 if (!UseLargePages) return;
2881
2882 // print a warning if any large page related flag is specified on command line
2883 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2884 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2885 bool success = false;
2886
2887 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2888 if (request_lock_memory_privilege()) {
2889 size_t s = GetLargePageMinimum();
2890 if (s) {
2891 #if defined(IA32) || defined(AMD64)
2892 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2893 WARN("JVM cannot use large pages bigger than 4mb.");
2894 } else {
2895 #endif
2896 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2897 _large_page_size = LargePageSizeInBytes;
2898 } else {
2899 _large_page_size = s;
2900 }
2901 success = true;
2902 #if defined(IA32) || defined(AMD64)
2903 }
2904 #endif
2905 } else {
2906 WARN("Large page is not supported by the processor.");
2907 }
2908 } else {
2909 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2910 }
2911 #undef WARN
2912
2913 const size_t default_page_size = (size_t) vm_page_size();
2914 if (success && _large_page_size > default_page_size) {
2915 _page_sizes[0] = _large_page_size;
2916 _page_sizes[1] = default_page_size;
2917 _page_sizes[2] = 0;
2918 }
2919
2920 cleanup_after_large_page_init();
2921 UseLargePages = success;
2922 }
2923
2924 int os::create_file_for_heap(const char* dir) {
2925
2926 const char name_template[] = "/jvmheap.XXXXXX";
2927 char *fullname = (char*)os::malloc((strlen(dir) + strlen(name_template) + 1), mtInternal);
2928 if (fullname == NULL) {
2929 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
2930 return -1;
2931 }
2932
2933 (void)strncpy(fullname, dir, strlen(dir)+1);
2934 (void)strncat(fullname, name_template, strlen(name_template));
2935
2936 os::native_path(fullname);
2937
2938 char *path = _mktemp(fullname);
2939 if (path == NULL) {
2940 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
2941 os::free(fullname);
2942 return -1;
2943 }
2944
2945 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
2946
2947 os::free(fullname);
2948 if (fd < 0) {
2949 warning("Problem opening file for heap (%s)", os::strerror(errno));
2950 return -1;
2951 }
2952 return fd;
2953 }
2954
2955 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
2956 char* os::map_memory_to_file(char* base, size_t size, int fd) {
2957 assert(fd != -1, "File descriptor is not valid");
2958
2959 HANDLE fh = (HANDLE)_get_osfhandle(fd);
2960 #ifdef _LP64
2961 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
2962 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
2963 #else
2964 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
2965 0, (DWORD)size, NULL);
2966 #endif
2967 if (fileMapping == NULL) {
2968 if (GetLastError() == ERROR_DISK_FULL) {
2969 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
2970 }
2971 else {
2972 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2973 }
2974
2975 return NULL;
2976 }
2977
2978 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
2979
2980 CloseHandle(fileMapping);
2981
2982 return (char*)addr;
2983 }
2984
2985 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
2986 assert(fd != -1, "File descriptor is not valid");
2987 assert(base != NULL, "Base address cannot be NULL");
2988
2989 release_memory(base, size);
2990 return map_memory_to_file(base, size, fd);
2991 }
2992
2993 // On win32, one cannot release just a part of reserved memory, it's an
2994 // all or nothing deal. When we split a reservation, we must break the
2995 // reservation into two reservations.
2996 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
2997 bool realloc) {
2998 if (size > 0) {
2999 release_memory(base, size);
3000 if (realloc) {
3001 reserve_memory(split, base);
3002 }
3003 if (size != split) {
3004 reserve_memory(size - split, base + split);
3005 }
3006 }
3007 }
3008
3009 // Multiple threads can race in this code but it's not possible to unmap small sections of
3010 // virtual space to get requested alignment, like posix-like os's.
3011 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3012 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3013 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3014 "Alignment must be a multiple of allocation granularity (page size)");
3015 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3016
3017 size_t extra_size = size + alignment;
3018 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3019
3020 char* aligned_base = NULL;
3021
3022 do {
3023 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3024 if (extra_base == NULL) {
3025 return NULL;
3026 }
3027 // Do manual alignment
3028 aligned_base = align_up(extra_base, alignment);
3029
3030 if (file_desc != -1) {
3031 os::unmap_memory(extra_base, extra_size);
3032 } else {
3033 os::release_memory(extra_base, extra_size);
3034 }
3035
3036 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3037
3038 } while (aligned_base == NULL);
3039
3040 return aligned_base;
3041 }
3042
3043 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3044 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3045 "reserve alignment");
3046 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3047 char* res;
3048 // note that if UseLargePages is on, all the areas that require interleaving
3049 // will go thru reserve_memory_special rather than thru here.
3050 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3051 if (!use_individual) {
3052 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3053 } else {
3054 elapsedTimer reserveTimer;
3055 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3056 // in numa interleaving, we have to allocate pages individually
3057 // (well really chunks of NUMAInterleaveGranularity size)
3058 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3059 if (res == NULL) {
3060 warning("NUMA page allocation failed");
3061 }
3062 if (Verbose && PrintMiscellaneous) {
3063 reserveTimer.stop();
3064 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3065 reserveTimer.milliseconds(), reserveTimer.ticks());
3066 }
3067 }
3068 assert(res == NULL || addr == NULL || addr == res,
3069 "Unexpected address from reserve.");
3070
3071 return res;
3072 }
3073
3074 // Reserve memory at an arbitrary address, only if that area is
3075 // available (and not reserved for something else).
3076 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3077 // Windows os::reserve_memory() fails of the requested address range is
3078 // not avilable.
3079 return reserve_memory(bytes, requested_addr);
3080 }
3081
3082 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3083 assert(file_desc >= 0, "file_desc is not valid");
3084 return map_memory_to_file(requested_addr, bytes, file_desc);
3085 }
3086
3087 size_t os::large_page_size() {
3088 return _large_page_size;
3089 }
3090
3091 bool os::can_commit_large_page_memory() {
3092 // Windows only uses large page memory when the entire region is reserved
3093 // and committed in a single VirtualAlloc() call. This may change in the
3094 // future, but with Windows 2003 it's not possible to commit on demand.
3095 return false;
3096 }
3097
3098 bool os::can_execute_large_page_memory() {
3099 return true;
3100 }
3101
3102 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3103 bool exec) {
3104 assert(UseLargePages, "only for large pages");
3105
3106 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3107 return NULL; // Fallback to small pages.
3108 }
3109
3110 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3111 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3112
3113 // with large pages, there are two cases where we need to use Individual Allocation
3114 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3115 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3116 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3117 log_debug(pagesize)("Reserving large pages individually.");
3118
3119 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3120 if (p_buf == NULL) {
3121 // give an appropriate warning message
3122 if (UseNUMAInterleaving) {
3123 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3124 }
3125 if (UseLargePagesIndividualAllocation) {
3126 warning("Individually allocated large pages failed, "
3127 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3128 }
3129 return NULL;
3130 }
3131
3132 return p_buf;
3133
3134 } else {
3135 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3136
3137 // normal policy just allocate it all at once
3138 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3139 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3140 if (res != NULL) {
3141 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3142 }
3143
3144 return res;
3145 }
3146 }
3147
3148 bool os::release_memory_special(char* base, size_t bytes) {
3149 assert(base != NULL, "Sanity check");
3150 return release_memory(base, bytes);
3151 }
3152
3153 void os::print_statistics() {
3154 }
3155
3156 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3157 int err = os::get_last_error();
3158 char buf[256];
3159 size_t buf_len = os::lasterror(buf, sizeof(buf));
3160 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3161 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3162 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3163 }
3164
3165 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3166 if (bytes == 0) {
3167 // Don't bother the OS with noops.
3168 return true;
3169 }
3170 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3171 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3172 // Don't attempt to print anything if the OS call fails. We're
3173 // probably low on resources, so the print itself may cause crashes.
3174
3175 // unless we have NUMAInterleaving enabled, the range of a commit
3176 // is always within a reserve covered by a single VirtualAlloc
3177 // in that case we can just do a single commit for the requested size
3178 if (!UseNUMAInterleaving) {
3179 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3180 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3181 return false;
3182 }
3183 if (exec) {
3184 DWORD oldprot;
3185 // Windows doc says to use VirtualProtect to get execute permissions
3186 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3187 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3188 return false;
3189 }
3190 }
3191 return true;
3192 } else {
3193
3194 // when NUMAInterleaving is enabled, the commit might cover a range that
3195 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3196 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3197 // returns represents the number of bytes that can be committed in one step.
3198 size_t bytes_remaining = bytes;
3199 char * next_alloc_addr = addr;
3200 while (bytes_remaining > 0) {
3201 MEMORY_BASIC_INFORMATION alloc_info;
3202 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3203 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3204 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3205 PAGE_READWRITE) == NULL) {
3206 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3207 exec);)
3208 return false;
3209 }
3210 if (exec) {
3211 DWORD oldprot;
3212 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3213 PAGE_EXECUTE_READWRITE, &oldprot)) {
3214 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3215 exec);)
3216 return false;
3217 }
3218 }
3219 bytes_remaining -= bytes_to_rq;
3220 next_alloc_addr += bytes_to_rq;
3221 }
3222 }
3223 // if we made it this far, return true
3224 return true;
3225 }
3226
3227 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3228 bool exec) {
3229 // alignment_hint is ignored on this OS
3230 return pd_commit_memory(addr, size, exec);
3231 }
3232
3233 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3234 const char* mesg) {
3235 assert(mesg != NULL, "mesg must be specified");
3236 if (!pd_commit_memory(addr, size, exec)) {
3237 warn_fail_commit_memory(addr, size, exec);
3238 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3239 }
3240 }
3241
3242 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3243 size_t alignment_hint, bool exec,
3244 const char* mesg) {
3245 // alignment_hint is ignored on this OS
3246 pd_commit_memory_or_exit(addr, size, exec, mesg);
3247 }
3248
3249 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3250 if (bytes == 0) {
3251 // Don't bother the OS with noops.
3252 return true;
3253 }
3254 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3255 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3256 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3257 }
3258
3259 bool os::pd_release_memory(char* addr, size_t bytes) {
3260 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3261 }
3262
3263 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3264 return os::commit_memory(addr, size, !ExecMem);
3265 }
3266
3267 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3268 return os::uncommit_memory(addr, size);
3269 }
3270
3271 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3272 uint count = 0;
3273 bool ret = false;
3274 size_t bytes_remaining = bytes;
3275 char * next_protect_addr = addr;
3276
3277 // Use VirtualQuery() to get the chunk size.
3278 while (bytes_remaining) {
3279 MEMORY_BASIC_INFORMATION alloc_info;
3280 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3281 return false;
3282 }
3283
3284 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3285 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3286 // but we don't distinguish here as both cases are protected by same API.
3287 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3288 warning("Failed protecting pages individually for chunk #%u", count);
3289 if (!ret) {
3290 return false;
3291 }
3292
3293 bytes_remaining -= bytes_to_protect;
3294 next_protect_addr += bytes_to_protect;
3295 count++;
3296 }
3297 return ret;
3298 }
3299
3300 // Set protections specified
3301 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3302 bool is_committed) {
3303 unsigned int p = 0;
3304 switch (prot) {
3305 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3306 case MEM_PROT_READ: p = PAGE_READONLY; break;
3307 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3308 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3309 default:
3310 ShouldNotReachHere();
3311 }
3312
3313 DWORD old_status;
3314
3315 // Strange enough, but on Win32 one can change protection only for committed
3316 // memory, not a big deal anyway, as bytes less or equal than 64K
3317 if (!is_committed) {
3318 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3319 "cannot commit protection page");
3320 }
3321 // One cannot use os::guard_memory() here, as on Win32 guard page
3322 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3323 //
3324 // Pages in the region become guard pages. Any attempt to access a guard page
3325 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3326 // the guard page status. Guard pages thus act as a one-time access alarm.
3327 bool ret;
3328 if (UseNUMAInterleaving) {
3329 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3330 // so we must protect the chunks individually.
3331 ret = protect_pages_individually(addr, bytes, p, &old_status);
3332 } else {
3333 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3334 }
3335 #ifdef ASSERT
3336 if (!ret) {
3337 int err = os::get_last_error();
3338 char buf[256];
3339 size_t buf_len = os::lasterror(buf, sizeof(buf));
3340 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3341 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3342 buf_len != 0 ? buf : "<no_error_string>", err);
3343 }
3344 #endif
3345 return ret;
3346 }
3347
3348 bool os::guard_memory(char* addr, size_t bytes) {
3349 DWORD old_status;
3350 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3351 }
3352
3353 bool os::unguard_memory(char* addr, size_t bytes) {
3354 DWORD old_status;
3355 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3356 }
3357
3358 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3359 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3360 void os::numa_make_global(char *addr, size_t bytes) { }
3361 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3362 bool os::numa_topology_changed() { return false; }
3363 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3364 int os::numa_get_group_id() { return 0; }
3365 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3366 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3367 // Provide an answer for UMA systems
3368 ids[0] = 0;
3369 return 1;
3370 } else {
3371 // check for size bigger than actual groups_num
3372 size = MIN2(size, numa_get_groups_num());
3373 for (int i = 0; i < (int)size; i++) {
3374 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3375 }
3376 return size;
3377 }
3378 }
3379
3380 bool os::get_page_info(char *start, page_info* info) {
3381 return false;
3382 }
3383
3384 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3385 page_info* page_found) {
3386 return end;
3387 }
3388
3389 char* os::non_memory_address_word() {
3390 // Must never look like an address returned by reserve_memory,
3391 // even in its subfields (as defined by the CPU immediate fields,
3392 // if the CPU splits constants across multiple instructions).
3393 return (char*)-1;
3394 }
3395
3396 #define MAX_ERROR_COUNT 100
3397 #define SYS_THREAD_ERROR 0xffffffffUL
3398
3399 void os::pd_start_thread(Thread* thread) {
3400 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3401 // Returns previous suspend state:
3402 // 0: Thread was not suspended
3403 // 1: Thread is running now
3404 // >1: Thread is still suspended.
3405 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3406 }
3407
3408 class HighResolutionInterval : public CHeapObj<mtThread> {
3409 // The default timer resolution seems to be 10 milliseconds.
3410 // (Where is this written down?)
3411 // If someone wants to sleep for only a fraction of the default,
3412 // then we set the timer resolution down to 1 millisecond for
3413 // the duration of their interval.
3414 // We carefully set the resolution back, since otherwise we
3415 // seem to incur an overhead (3%?) that we don't need.
3416 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3417 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3418 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3419 // timeBeginPeriod() if the relative error exceeded some threshold.
3420 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3421 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3422 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3423 // resolution timers running.
3424 private:
3425 jlong resolution;
3426 public:
3427 HighResolutionInterval(jlong ms) {
3428 resolution = ms % 10L;
3429 if (resolution != 0) {
3430 MMRESULT result = timeBeginPeriod(1L);
3431 }
3432 }
3433 ~HighResolutionInterval() {
3434 if (resolution != 0) {
3435 MMRESULT result = timeEndPeriod(1L);
3436 }
3437 resolution = 0L;
3438 }
3439 };
3440
3441 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3442 jlong limit = (jlong) MAXDWORD;
3443
3444 while (ms > limit) {
3445 int res;
3446 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3447 return res;
3448 }
3449 ms -= limit;
3450 }
3451
3452 assert(thread == Thread::current(), "thread consistency check");
3453 OSThread* osthread = thread->osthread();
3454 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3455 int result;
3456 if (interruptable) {
3457 assert(thread->is_Java_thread(), "must be java thread");
3458 JavaThread *jt = (JavaThread *) thread;
3459 ThreadBlockInVM tbivm(jt);
3460
3461 jt->set_suspend_equivalent();
3462 // cleared by handle_special_suspend_equivalent_condition() or
3463 // java_suspend_self() via check_and_wait_while_suspended()
3464
3465 HANDLE events[1];
3466 events[0] = osthread->interrupt_event();
3467 HighResolutionInterval *phri=NULL;
3468 if (!ForceTimeHighResolution) {
3469 phri = new HighResolutionInterval(ms);
3470 }
3471 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3472 result = OS_TIMEOUT;
3473 } else {
3474 ResetEvent(osthread->interrupt_event());
3475 osthread->set_interrupted(false);
3476 result = OS_INTRPT;
3477 }
3478 delete phri; //if it is NULL, harmless
3479
3480 // were we externally suspended while we were waiting?
3481 jt->check_and_wait_while_suspended();
3482 } else {
3483 assert(!thread->is_Java_thread(), "must not be java thread");
3484 Sleep((long) ms);
3485 result = OS_TIMEOUT;
3486 }
3487 return result;
3488 }
3489
3490 // Short sleep, direct OS call.
3491 //
3492 // ms = 0, means allow others (if any) to run.
3493 //
3494 void os::naked_short_sleep(jlong ms) {
3495 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3496 Sleep(ms);
3497 }
3498
3499 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3500 void os::infinite_sleep() {
3501 while (true) { // sleep forever ...
3502 Sleep(100000); // ... 100 seconds at a time
3503 }
3504 }
3505
3506 typedef BOOL (WINAPI * STTSignature)(void);
3507
3508 void os::naked_yield() {
3509 // Consider passing back the return value from SwitchToThread().
3510 SwitchToThread();
3511 }
3512
3513 // Win32 only gives you access to seven real priorities at a time,
3514 // so we compress Java's ten down to seven. It would be better
3515 // if we dynamically adjusted relative priorities.
3516
3517 int os::java_to_os_priority[CriticalPriority + 1] = {
3518 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3519 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3520 THREAD_PRIORITY_LOWEST, // 2
3521 THREAD_PRIORITY_BELOW_NORMAL, // 3
3522 THREAD_PRIORITY_BELOW_NORMAL, // 4
3523 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3524 THREAD_PRIORITY_NORMAL, // 6
3525 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3526 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3527 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3528 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3529 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3530 };
3531
3532 int prio_policy1[CriticalPriority + 1] = {
3533 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3534 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3535 THREAD_PRIORITY_LOWEST, // 2
3536 THREAD_PRIORITY_BELOW_NORMAL, // 3
3537 THREAD_PRIORITY_BELOW_NORMAL, // 4
3538 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3539 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3540 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3541 THREAD_PRIORITY_HIGHEST, // 8
3542 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3543 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3544 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3545 };
3546
3547 static int prio_init() {
3548 // If ThreadPriorityPolicy is 1, switch tables
3549 if (ThreadPriorityPolicy == 1) {
3550 int i;
3551 for (i = 0; i < CriticalPriority + 1; i++) {
3552 os::java_to_os_priority[i] = prio_policy1[i];
3553 }
3554 }
3555 if (UseCriticalJavaThreadPriority) {
3556 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3557 }
3558 return 0;
3559 }
3560
3561 OSReturn os::set_native_priority(Thread* thread, int priority) {
3562 if (!UseThreadPriorities) return OS_OK;
3563 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3564 return ret ? OS_OK : OS_ERR;
3565 }
3566
3567 OSReturn os::get_native_priority(const Thread* const thread,
3568 int* priority_ptr) {
3569 if (!UseThreadPriorities) {
3570 *priority_ptr = java_to_os_priority[NormPriority];
3571 return OS_OK;
3572 }
3573 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3574 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3575 assert(false, "GetThreadPriority failed");
3576 return OS_ERR;
3577 }
3578 *priority_ptr = os_prio;
3579 return OS_OK;
3580 }
3581
3582
3583 // Hint to the underlying OS that a task switch would not be good.
3584 // Void return because it's a hint and can fail.
3585 void os::hint_no_preempt() {}
3586
3587 void os::interrupt(Thread* thread) {
3588 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3589
3590 OSThread* osthread = thread->osthread();
3591 osthread->set_interrupted(true);
3592 // More than one thread can get here with the same value of osthread,
3593 // resulting in multiple notifications. We do, however, want the store
3594 // to interrupted() to be visible to other threads before we post
3595 // the interrupt event.
3596 OrderAccess::release();
3597 SetEvent(osthread->interrupt_event());
3598 // For JSR166: unpark after setting status
3599 if (thread->is_Java_thread()) {
3600 ((JavaThread*)thread)->parker()->unpark();
3601 }
3602
3603 ParkEvent * ev = thread->_ParkEvent;
3604 if (ev != NULL) ev->unpark();
3605 }
3606
3607
3608 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3609 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3610
3611 OSThread* osthread = thread->osthread();
3612 // There is no synchronization between the setting of the interrupt
3613 // and it being cleared here. It is critical - see 6535709 - that
3614 // we only clear the interrupt state, and reset the interrupt event,
3615 // if we are going to report that we were indeed interrupted - else
3616 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3617 // depending on the timing. By checking thread interrupt event to see
3618 // if the thread gets real interrupt thus prevent spurious wakeup.
3619 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3620 if (interrupted && clear_interrupted) {
3621 osthread->set_interrupted(false);
3622 ResetEvent(osthread->interrupt_event());
3623 } // Otherwise leave the interrupted state alone
3624
3625 return interrupted;
3626 }
3627
3628 // GetCurrentThreadId() returns DWORD
3629 intx os::current_thread_id() { return GetCurrentThreadId(); }
3630
3631 static int _initial_pid = 0;
3632
3633 int os::current_process_id() {
3634 return (_initial_pid ? _initial_pid : _getpid());
3635 }
3636
3637 int os::win32::_vm_page_size = 0;
3638 int os::win32::_vm_allocation_granularity = 0;
3639 int os::win32::_processor_type = 0;
3640 // Processor level is not available on non-NT systems, use vm_version instead
3641 int os::win32::_processor_level = 0;
3642 julong os::win32::_physical_memory = 0;
3643 size_t os::win32::_default_stack_size = 0;
3644
3645 intx os::win32::_os_thread_limit = 0;
3646 volatile intx os::win32::_os_thread_count = 0;
3647
3648 bool os::win32::_is_windows_server = false;
3649
3650 // 6573254
3651 // Currently, the bug is observed across all the supported Windows releases,
3652 // including the latest one (as of this writing - Windows Server 2012 R2)
3653 bool os::win32::_has_exit_bug = true;
3654
3655 void os::win32::initialize_system_info() {
3656 SYSTEM_INFO si;
3657 GetSystemInfo(&si);
3658 _vm_page_size = si.dwPageSize;
3659 _vm_allocation_granularity = si.dwAllocationGranularity;
3660 _processor_type = si.dwProcessorType;
3661 _processor_level = si.wProcessorLevel;
3662 set_processor_count(si.dwNumberOfProcessors);
3663
3664 MEMORYSTATUSEX ms;
3665 ms.dwLength = sizeof(ms);
3666
3667 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3668 // dwMemoryLoad (% of memory in use)
3669 GlobalMemoryStatusEx(&ms);
3670 _physical_memory = ms.ullTotalPhys;
3671
3672 if (FLAG_IS_DEFAULT(MaxRAM)) {
3673 // Adjust MaxRAM according to the maximum virtual address space available.
3674 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3675 }
3676
3677 OSVERSIONINFOEX oi;
3678 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3679 GetVersionEx((OSVERSIONINFO*)&oi);
3680 switch (oi.dwPlatformId) {
3681 case VER_PLATFORM_WIN32_NT:
3682 {
3683 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3684 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3685 oi.wProductType == VER_NT_SERVER) {
3686 _is_windows_server = true;
3687 }
3688 }
3689 break;
3690 default: fatal("Unknown platform");
3691 }
3692
3693 _default_stack_size = os::current_stack_size();
3694 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3695 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3696 "stack size not a multiple of page size");
3697
3698 initialize_performance_counter();
3699 }
3700
3701
3702 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3703 int ebuflen) {
3704 char path[MAX_PATH];
3705 DWORD size;
3706 DWORD pathLen = (DWORD)sizeof(path);
3707 HINSTANCE result = NULL;
3708
3709 // only allow library name without path component
3710 assert(strchr(name, '\\') == NULL, "path not allowed");
3711 assert(strchr(name, ':') == NULL, "path not allowed");
3712 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3713 jio_snprintf(ebuf, ebuflen,
3714 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3715 return NULL;
3716 }
3717
3718 // search system directory
3719 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3720 if (size >= pathLen) {
3721 return NULL; // truncated
3722 }
3723 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3724 return NULL; // truncated
3725 }
3726 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3727 return result;
3728 }
3729 }
3730
3731 // try Windows directory
3732 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3733 if (size >= pathLen) {
3734 return NULL; // truncated
3735 }
3736 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3737 return NULL; // truncated
3738 }
3739 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3740 return result;
3741 }
3742 }
3743
3744 jio_snprintf(ebuf, ebuflen,
3745 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3746 return NULL;
3747 }
3748
3749 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3750 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3751
3752 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3753 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3754 return TRUE;
3755 }
3756
3757 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3758 // Basic approach:
3759 // - Each exiting thread registers its intent to exit and then does so.
3760 // - A thread trying to terminate the process must wait for all
3761 // threads currently exiting to complete their exit.
3762
3763 if (os::win32::has_exit_bug()) {
3764 // The array holds handles of the threads that have started exiting by calling
3765 // _endthreadex().
3766 // Should be large enough to avoid blocking the exiting thread due to lack of
3767 // a free slot.
3768 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3769 static int handle_count = 0;
3770
3771 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3772 static CRITICAL_SECTION crit_sect;
3773 static volatile DWORD process_exiting = 0;
3774 int i, j;
3775 DWORD res;
3776 HANDLE hproc, hthr;
3777
3778 // We only attempt to register threads until a process exiting
3779 // thread manages to set the process_exiting flag. Any threads
3780 // that come through here after the process_exiting flag is set
3781 // are unregistered and will be caught in the SuspendThread()
3782 // infinite loop below.
3783 bool registered = false;
3784
3785 // The first thread that reached this point, initializes the critical section.
3786 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3787 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3788 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3789 if (what != EPT_THREAD) {
3790 // Atomically set process_exiting before the critical section
3791 // to increase the visibility between racing threads.
3792 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3793 }
3794 EnterCriticalSection(&crit_sect);
3795
3796 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3797 // Remove from the array those handles of the threads that have completed exiting.
3798 for (i = 0, j = 0; i < handle_count; ++i) {
3799 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3800 if (res == WAIT_TIMEOUT) {
3801 handles[j++] = handles[i];
3802 } else {
3803 if (res == WAIT_FAILED) {
3804 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3805 GetLastError(), __FILE__, __LINE__);
3806 }
3807 // Don't keep the handle, if we failed waiting for it.
3808 CloseHandle(handles[i]);
3809 }
3810 }
3811
3812 // If there's no free slot in the array of the kept handles, we'll have to
3813 // wait until at least one thread completes exiting.
3814 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3815 // Raise the priority of the oldest exiting thread to increase its chances
3816 // to complete sooner.
3817 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3818 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3819 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3820 i = (res - WAIT_OBJECT_0);
3821 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3822 for (; i < handle_count; ++i) {
3823 handles[i] = handles[i + 1];
3824 }
3825 } else {
3826 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3827 (res == WAIT_FAILED ? "failed" : "timed out"),
3828 GetLastError(), __FILE__, __LINE__);
3829 // Don't keep handles, if we failed waiting for them.
3830 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3831 CloseHandle(handles[i]);
3832 }
3833 handle_count = 0;
3834 }
3835 }
3836
3837 // Store a duplicate of the current thread handle in the array of handles.
3838 hproc = GetCurrentProcess();
3839 hthr = GetCurrentThread();
3840 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3841 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3842 warning("DuplicateHandle failed (%u) in %s: %d\n",
3843 GetLastError(), __FILE__, __LINE__);
3844
3845 // We can't register this thread (no more handles) so this thread
3846 // may be racing with a thread that is calling exit(). If the thread
3847 // that is calling exit() has managed to set the process_exiting
3848 // flag, then this thread will be caught in the SuspendThread()
3849 // infinite loop below which closes that race. A small timing
3850 // window remains before the process_exiting flag is set, but it
3851 // is only exposed when we are out of handles.
3852 } else {
3853 ++handle_count;
3854 registered = true;
3855
3856 // The current exiting thread has stored its handle in the array, and now
3857 // should leave the critical section before calling _endthreadex().
3858 }
3859
3860 } else if (what != EPT_THREAD && handle_count > 0) {
3861 jlong start_time, finish_time, timeout_left;
3862 // Before ending the process, make sure all the threads that had called
3863 // _endthreadex() completed.
3864
3865 // Set the priority level of the current thread to the same value as
3866 // the priority level of exiting threads.
3867 // This is to ensure it will be given a fair chance to execute if
3868 // the timeout expires.
3869 hthr = GetCurrentThread();
3870 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3871 start_time = os::javaTimeNanos();
3872 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3873 for (i = 0; ; ) {
3874 int portion_count = handle_count - i;
3875 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3876 portion_count = MAXIMUM_WAIT_OBJECTS;
3877 }
3878 for (j = 0; j < portion_count; ++j) {
3879 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3880 }
3881 timeout_left = (finish_time - start_time) / 1000000L;
3882 if (timeout_left < 0) {
3883 timeout_left = 0;
3884 }
3885 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3886 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3887 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3888 (res == WAIT_FAILED ? "failed" : "timed out"),
3889 GetLastError(), __FILE__, __LINE__);
3890 // Reset portion_count so we close the remaining
3891 // handles due to this error.
3892 portion_count = handle_count - i;
3893 }
3894 for (j = 0; j < portion_count; ++j) {
3895 CloseHandle(handles[i + j]);
3896 }
3897 if ((i += portion_count) >= handle_count) {
3898 break;
3899 }
3900 start_time = os::javaTimeNanos();
3901 }
3902 handle_count = 0;
3903 }
3904
3905 LeaveCriticalSection(&crit_sect);
3906 }
3907
3908 if (!registered &&
3909 OrderAccess::load_acquire(&process_exiting) != 0 &&
3910 process_exiting != GetCurrentThreadId()) {
3911 // Some other thread is about to call exit(), so we don't let
3912 // the current unregistered thread proceed to exit() or _endthreadex()
3913 while (true) {
3914 SuspendThread(GetCurrentThread());
3915 // Avoid busy-wait loop, if SuspendThread() failed.
3916 Sleep(EXIT_TIMEOUT);
3917 }
3918 }
3919 }
3920
3921 // We are here if either
3922 // - there's no 'race at exit' bug on this OS release;
3923 // - initialization of the critical section failed (unlikely);
3924 // - the current thread has registered itself and left the critical section;
3925 // - the process-exiting thread has raised the flag and left the critical section.
3926 if (what == EPT_THREAD) {
3927 _endthreadex((unsigned)exit_code);
3928 } else if (what == EPT_PROCESS) {
3929 ::exit(exit_code);
3930 } else {
3931 _exit(exit_code);
3932 }
3933
3934 // Should not reach here
3935 return exit_code;
3936 }
3937
3938 #undef EXIT_TIMEOUT
3939
3940 void os::win32::setmode_streams() {
3941 _setmode(_fileno(stdin), _O_BINARY);
3942 _setmode(_fileno(stdout), _O_BINARY);
3943 _setmode(_fileno(stderr), _O_BINARY);
3944 }
3945
3946
3947 bool os::is_debugger_attached() {
3948 return IsDebuggerPresent() ? true : false;
3949 }
3950
3951
3952 void os::wait_for_keypress_at_exit(void) {
3953 if (PauseAtExit) {
3954 fprintf(stderr, "Press any key to continue...\n");
3955 fgetc(stdin);
3956 }
3957 }
3958
3959
3960 bool os::message_box(const char* title, const char* message) {
3961 int result = MessageBox(NULL, message, title,
3962 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3963 return result == IDYES;
3964 }
3965
3966 #ifndef PRODUCT
3967 #ifndef _WIN64
3968 // Helpers to check whether NX protection is enabled
3969 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3970 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3971 pex->ExceptionRecord->NumberParameters > 0 &&
3972 pex->ExceptionRecord->ExceptionInformation[0] ==
3973 EXCEPTION_INFO_EXEC_VIOLATION) {
3974 return EXCEPTION_EXECUTE_HANDLER;
3975 }
3976 return EXCEPTION_CONTINUE_SEARCH;
3977 }
3978
3979 void nx_check_protection() {
3980 // If NX is enabled we'll get an exception calling into code on the stack
3981 char code[] = { (char)0xC3 }; // ret
3982 void *code_ptr = (void *)code;
3983 __try {
3984 __asm call code_ptr
3985 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3986 tty->print_raw_cr("NX protection detected.");
3987 }
3988 }
3989 #endif // _WIN64
3990 #endif // PRODUCT
3991
3992 // This is called _before_ the global arguments have been parsed
3993 void os::init(void) {
3994 _initial_pid = _getpid();
3995
3996 init_random(1234567);
3997
3998 win32::initialize_system_info();
3999 win32::setmode_streams();
4000 init_page_sizes((size_t) win32::vm_page_size());
4001
4002 // This may be overridden later when argument processing is done.
4003 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4004
4005 // Initialize main_process and main_thread
4006 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4007 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4008 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4009 fatal("DuplicateHandle failed\n");
4010 }
4011 main_thread_id = (int) GetCurrentThreadId();
4012
4013 // initialize fast thread access - only used for 32-bit
4014 win32::initialize_thread_ptr_offset();
4015 }
4016
4017 // To install functions for atexit processing
4018 extern "C" {
4019 static void perfMemory_exit_helper() {
4020 perfMemory_exit();
4021 }
4022 }
4023
4024 static jint initSock();
4025
4026 // this is called _after_ the global arguments have been parsed
4027 jint os::init_2(void) {
4028 // Setup Windows Exceptions
4029
4030 // for debugging float code generation bugs
4031 if (ForceFloatExceptions) {
4032 #ifndef _WIN64
4033 static long fp_control_word = 0;
4034 __asm { fstcw fp_control_word }
4035 // see Intel PPro Manual, Vol. 2, p 7-16
4036 const long precision = 0x20;
4037 const long underflow = 0x10;
4038 const long overflow = 0x08;
4039 const long zero_div = 0x04;
4040 const long denorm = 0x02;
4041 const long invalid = 0x01;
4042 fp_control_word |= invalid;
4043 __asm { fldcw fp_control_word }
4044 #endif
4045 }
4046
4047 // If stack_commit_size is 0, windows will reserve the default size,
4048 // but only commit a small portion of it.
4049 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4050 size_t default_reserve_size = os::win32::default_stack_size();
4051 size_t actual_reserve_size = stack_commit_size;
4052 if (stack_commit_size < default_reserve_size) {
4053 // If stack_commit_size == 0, we want this too
4054 actual_reserve_size = default_reserve_size;
4055 }
4056
4057 // Check minimum allowable stack size for thread creation and to initialize
4058 // the java system classes, including StackOverflowError - depends on page
4059 // size. Add two 4K pages for compiler2 recursion in main thread.
4060 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4061 // class initialization depending on 32 or 64 bit VM.
4062 size_t min_stack_allowed =
4063 (size_t)(JavaThread::stack_guard_zone_size() +
4064 JavaThread::stack_shadow_zone_size() +
4065 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4066
4067 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4068
4069 if (actual_reserve_size < min_stack_allowed) {
4070 tty->print_cr("\nThe Java thread stack size specified is too small. "
4071 "Specify at least %dk",
4072 min_stack_allowed / K);
4073 return JNI_ERR;
4074 }
4075
4076 JavaThread::set_stack_size_at_create(stack_commit_size);
4077
4078 // Calculate theoretical max. size of Threads to guard gainst artifical
4079 // out-of-memory situations, where all available address-space has been
4080 // reserved by thread stacks.
4081 assert(actual_reserve_size != 0, "Must have a stack");
4082
4083 // Calculate the thread limit when we should start doing Virtual Memory
4084 // banging. Currently when the threads will have used all but 200Mb of space.
4085 //
4086 // TODO: consider performing a similar calculation for commit size instead
4087 // as reserve size, since on a 64-bit platform we'll run into that more
4088 // often than running out of virtual memory space. We can use the
4089 // lower value of the two calculations as the os_thread_limit.
4090 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4091 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4092
4093 // at exit methods are called in the reverse order of their registration.
4094 // there is no limit to the number of functions registered. atexit does
4095 // not set errno.
4096
4097 if (PerfAllowAtExitRegistration) {
4098 // only register atexit functions if PerfAllowAtExitRegistration is set.
4099 // atexit functions can be delayed until process exit time, which
4100 // can be problematic for embedded VM situations. Embedded VMs should
4101 // call DestroyJavaVM() to assure that VM resources are released.
4102
4103 // note: perfMemory_exit_helper atexit function may be removed in
4104 // the future if the appropriate cleanup code can be added to the
4105 // VM_Exit VMOperation's doit method.
4106 if (atexit(perfMemory_exit_helper) != 0) {
4107 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4108 }
4109 }
4110
4111 #ifndef _WIN64
4112 // Print something if NX is enabled (win32 on AMD64)
4113 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4114 #endif
4115
4116 // initialize thread priority policy
4117 prio_init();
4118
4119 if (UseNUMA && !ForceNUMA) {
4120 UseNUMA = false; // We don't fully support this yet
4121 }
4122
4123 if (UseNUMAInterleaving) {
4124 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4125 bool success = numa_interleaving_init();
4126 if (!success) UseNUMAInterleaving = false;
4127 }
4128
4129 if (initSock() != JNI_OK) {
4130 return JNI_ERR;
4131 }
4132
4133 SymbolEngine::recalc_search_path();
4134
4135 return JNI_OK;
4136 }
4137
4138 // Mark the polling page as unreadable
4139 void os::make_polling_page_unreadable(void) {
4140 DWORD old_status;
4141 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4142 PAGE_NOACCESS, &old_status)) {
4143 fatal("Could not disable polling page");
4144 }
4145 }
4146
4147 // Mark the polling page as readable
4148 void os::make_polling_page_readable(void) {
4149 DWORD old_status;
4150 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4151 PAGE_READONLY, &old_status)) {
4152 fatal("Could not enable polling page");
4153 }
4154 }
4155
4156 // combine the high and low DWORD into a ULONGLONG
4157 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4158 ULONGLONG value = high_word;
4159 value <<= sizeof(high_word) * 8;
4160 value |= low_word;
4161 return value;
4162 }
4163
4164 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4165 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4166 ::memset((void*)sbuf, 0, sizeof(struct stat));
4167 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4168 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4169 file_data.ftLastWriteTime.dwLowDateTime);
4170 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4171 file_data.ftCreationTime.dwLowDateTime);
4172 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4173 file_data.ftLastAccessTime.dwLowDateTime);
4174 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4175 sbuf->st_mode |= S_IFDIR;
4176 } else {
4177 sbuf->st_mode |= S_IFREG;
4178 }
4179 }
4180
4181 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4182 // Creates an UNC path from a single byte path. Return buffer is
4183 // allocated in C heap and needs to be freed by the caller.
4184 // Returns NULL on error.
4185 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4186 wchar_t* wpath = NULL;
4187 size_t converted_chars = 0;
4188 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4189 if (path[0] == '\\' && path[1] == '\\') {
4190 if (path[2] == '?' && path[3] == '\\'){
4191 // if it already has a \\?\ don't do the prefix
4192 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4193 if (wpath != NULL) {
4194 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4195 } else {
4196 err = ENOMEM;
4197 }
4198 } else {
4199 // only UNC pathname includes double slashes here
4200 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4201 if (wpath != NULL) {
4202 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4203 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4204 } else {
4205 err = ENOMEM;
4206 }
4207 }
4208 } else {
4209 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4210 if (wpath != NULL) {
4211 ::wcscpy(wpath, L"\\\\?\\\0");
4212 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4213 } else {
4214 err = ENOMEM;
4215 }
4216 }
4217 return wpath;
4218 }
4219
4220 static void destroy_unc_path(wchar_t* wpath) {
4221 os::free(wpath);
4222 }
4223
4224 int os::stat(const char *path, struct stat *sbuf) {
4225 char* pathbuf = (char*)os::strdup(path, mtInternal);
4226 if (pathbuf == NULL) {
4227 errno = ENOMEM;
4228 return -1;
4229 }
4230 os::native_path(pathbuf);
4231 int ret;
4232 WIN32_FILE_ATTRIBUTE_DATA file_data;
4233 // Not using stat() to avoid the problem described in JDK-6539723
4234 if (strlen(path) < MAX_PATH) {
4235 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4236 if (!bret) {
4237 errno = ::GetLastError();
4238 ret = -1;
4239 }
4240 else {
4241 file_attribute_data_to_stat(sbuf, file_data);
4242 ret = 0;
4243 }
4244 } else {
4245 errno_t err = ERROR_SUCCESS;
4246 wchar_t* wpath = create_unc_path(pathbuf, err);
4247 if (err != ERROR_SUCCESS) {
4248 if (wpath != NULL) {
4249 destroy_unc_path(wpath);
4250 }
4251 os::free(pathbuf);
4252 errno = err;
4253 return -1;
4254 }
4255 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4256 if (!bret) {
4257 errno = ::GetLastError();
4258 ret = -1;
4259 } else {
4260 file_attribute_data_to_stat(sbuf, file_data);
4261 ret = 0;
4262 }
4263 destroy_unc_path(wpath);
4264 }
4265 os::free(pathbuf);
4266 return ret;
4267 }
4268
4269
4270 #define FT2INT64(ft) \
4271 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4272
4273
4274 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4275 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4276 // of a thread.
4277 //
4278 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4279 // the fast estimate available on the platform.
4280
4281 // current_thread_cpu_time() is not optimized for Windows yet
4282 jlong os::current_thread_cpu_time() {
4283 // return user + sys since the cost is the same
4284 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4285 }
4286
4287 jlong os::thread_cpu_time(Thread* thread) {
4288 // consistent with what current_thread_cpu_time() returns.
4289 return os::thread_cpu_time(thread, true /* user+sys */);
4290 }
4291
4292 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4293 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4294 }
4295
4296 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4297 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4298 // If this function changes, os::is_thread_cpu_time_supported() should too
4299 FILETIME CreationTime;
4300 FILETIME ExitTime;
4301 FILETIME KernelTime;
4302 FILETIME UserTime;
4303
4304 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4305 &ExitTime, &KernelTime, &UserTime) == 0) {
4306 return -1;
4307 } else if (user_sys_cpu_time) {
4308 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4309 } else {
4310 return FT2INT64(UserTime) * 100;
4311 }
4312 }
4313
4314 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4315 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4316 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4317 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4318 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4319 }
4320
4321 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4322 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4323 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4324 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4325 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4326 }
4327
4328 bool os::is_thread_cpu_time_supported() {
4329 // see os::thread_cpu_time
4330 FILETIME CreationTime;
4331 FILETIME ExitTime;
4332 FILETIME KernelTime;
4333 FILETIME UserTime;
4334
4335 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4336 &KernelTime, &UserTime) == 0) {
4337 return false;
4338 } else {
4339 return true;
4340 }
4341 }
4342
4343 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4344 // It does have primitives (PDH API) to get CPU usage and run queue length.
4345 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4346 // If we wanted to implement loadavg on Windows, we have a few options:
4347 //
4348 // a) Query CPU usage and run queue length and "fake" an answer by
4349 // returning the CPU usage if it's under 100%, and the run queue
4350 // length otherwise. It turns out that querying is pretty slow
4351 // on Windows, on the order of 200 microseconds on a fast machine.
4352 // Note that on the Windows the CPU usage value is the % usage
4353 // since the last time the API was called (and the first call
4354 // returns 100%), so we'd have to deal with that as well.
4355 //
4356 // b) Sample the "fake" answer using a sampling thread and store
4357 // the answer in a global variable. The call to loadavg would
4358 // just return the value of the global, avoiding the slow query.
4359 //
4360 // c) Sample a better answer using exponential decay to smooth the
4361 // value. This is basically the algorithm used by UNIX kernels.
4362 //
4363 // Note that sampling thread starvation could affect both (b) and (c).
4364 int os::loadavg(double loadavg[], int nelem) {
4365 return -1;
4366 }
4367
4368
4369 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4370 bool os::dont_yield() {
4371 return DontYieldALot;
4372 }
4373
4374 // This method is a slightly reworked copy of JDK's sysOpen
4375 // from src/windows/hpi/src/sys_api_md.c
4376
4377 int os::open(const char *path, int oflag, int mode) {
4378 char* pathbuf = (char*)os::strdup(path, mtInternal);
4379 if (pathbuf == NULL) {
4380 errno = ENOMEM;
4381 return -1;
4382 }
4383 os::native_path(pathbuf);
4384 int ret;
4385 if (strlen(path) < MAX_PATH) {
4386 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4387 } else {
4388 errno_t err = ERROR_SUCCESS;
4389 wchar_t* wpath = create_unc_path(pathbuf, err);
4390 if (err != ERROR_SUCCESS) {
4391 if (wpath != NULL) {
4392 destroy_unc_path(wpath);
4393 }
4394 os::free(pathbuf);
4395 errno = err;
4396 return -1;
4397 }
4398 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4399 if (ret == -1) {
4400 errno = ::GetLastError();
4401 }
4402 destroy_unc_path(wpath);
4403 }
4404 os::free(pathbuf);
4405 return ret;
4406 }
4407
4408 FILE* os::open(int fd, const char* mode) {
4409 return ::_fdopen(fd, mode);
4410 }
4411
4412 // Is a (classpath) directory empty?
4413 bool os::dir_is_empty(const char* path) {
4414 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4415 if (search_path == NULL) {
4416 errno = ENOMEM;
4417 return false;
4418 }
4419 strcpy(search_path, path);
4420 // Append "*", or possibly "\\*", to path
4421 if (path[1] == ':' &&
4422 (path[2] == '\0' ||
4423 (path[2] == '\\' && path[3] == '\0'))) {
4424 // No '\\' needed for cases like "Z:" or "Z:\"
4425 strcat(search_path, "*");
4426 }
4427 else {
4428 strcat(search_path, "\\*");
4429 }
4430 errno_t err = ERROR_SUCCESS;
4431 wchar_t* wpath = create_unc_path(search_path, err);
4432 if (err != ERROR_SUCCESS) {
4433 if (wpath != NULL) {
4434 destroy_unc_path(wpath);
4435 }
4436 os::free(search_path);
4437 errno = err;
4438 return false;
4439 }
4440 WIN32_FIND_DATAW fd;
4441 HANDLE f = ::FindFirstFileW(wpath, &fd);
4442 destroy_unc_path(wpath);
4443 bool is_empty = true;
4444 if (f != INVALID_HANDLE_VALUE) {
4445 while (is_empty && ::FindNextFileW(f, &fd)) {
4446 // An empty directory contains only the current directory file
4447 // and the previous directory file.
4448 if ((wcscmp(fd.cFileName, L".") != 0) &&
4449 (wcscmp(fd.cFileName, L"..") != 0)) {
4450 is_empty = false;
4451 }
4452 }
4453 FindClose(f);
4454 }
4455 os::free(search_path);
4456 return is_empty;
4457 }
4458
4459 // create binary file, rewriting existing file if required
4460 int os::create_binary_file(const char* path, bool rewrite_existing) {
4461 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4462 if (!rewrite_existing) {
4463 oflags |= _O_EXCL;
4464 }
4465 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4466 }
4467
4468 // return current position of file pointer
4469 jlong os::current_file_offset(int fd) {
4470 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4471 }
4472
4473 // move file pointer to the specified offset
4474 jlong os::seek_to_file_offset(int fd, jlong offset) {
4475 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4476 }
4477
4478
4479 jlong os::lseek(int fd, jlong offset, int whence) {
4480 return (jlong) ::_lseeki64(fd, offset, whence);
4481 }
4482
4483 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4484 OVERLAPPED ov;
4485 DWORD nread;
4486 BOOL result;
4487
4488 ZeroMemory(&ov, sizeof(ov));
4489 ov.Offset = (DWORD)offset;
4490 ov.OffsetHigh = (DWORD)(offset >> 32);
4491
4492 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4493
4494 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4495
4496 return result ? nread : 0;
4497 }
4498
4499
4500 // This method is a slightly reworked copy of JDK's sysNativePath
4501 // from src/windows/hpi/src/path_md.c
4502
4503 // Convert a pathname to native format. On win32, this involves forcing all
4504 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4505 // sometimes rejects '/') and removing redundant separators. The input path is
4506 // assumed to have been converted into the character encoding used by the local
4507 // system. Because this might be a double-byte encoding, care is taken to
4508 // treat double-byte lead characters correctly.
4509 //
4510 // This procedure modifies the given path in place, as the result is never
4511 // longer than the original. There is no error return; this operation always
4512 // succeeds.
4513 char * os::native_path(char *path) {
4514 char *src = path, *dst = path, *end = path;
4515 char *colon = NULL; // If a drive specifier is found, this will
4516 // point to the colon following the drive letter
4517
4518 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4519 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4520 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4521
4522 // Check for leading separators
4523 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4524 while (isfilesep(*src)) {
4525 src++;
4526 }
4527
4528 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4529 // Remove leading separators if followed by drive specifier. This
4530 // hack is necessary to support file URLs containing drive
4531 // specifiers (e.g., "file://c:/path"). As a side effect,
4532 // "/c:/path" can be used as an alternative to "c:/path".
4533 *dst++ = *src++;
4534 colon = dst;
4535 *dst++ = ':';
4536 src++;
4537 } else {
4538 src = path;
4539 if (isfilesep(src[0]) && isfilesep(src[1])) {
4540 // UNC pathname: Retain first separator; leave src pointed at
4541 // second separator so that further separators will be collapsed
4542 // into the second separator. The result will be a pathname
4543 // beginning with "\\\\" followed (most likely) by a host name.
4544 src = dst = path + 1;
4545 path[0] = '\\'; // Force first separator to '\\'
4546 }
4547 }
4548
4549 end = dst;
4550
4551 // Remove redundant separators from remainder of path, forcing all
4552 // separators to be '\\' rather than '/'. Also, single byte space
4553 // characters are removed from the end of the path because those
4554 // are not legal ending characters on this operating system.
4555 //
4556 while (*src != '\0') {
4557 if (isfilesep(*src)) {
4558 *dst++ = '\\'; src++;
4559 while (isfilesep(*src)) src++;
4560 if (*src == '\0') {
4561 // Check for trailing separator
4562 end = dst;
4563 if (colon == dst - 2) break; // "z:\\"
4564 if (dst == path + 1) break; // "\\"
4565 if (dst == path + 2 && isfilesep(path[0])) {
4566 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4567 // beginning of a UNC pathname. Even though it is not, by
4568 // itself, a valid UNC pathname, we leave it as is in order
4569 // to be consistent with the path canonicalizer as well
4570 // as the win32 APIs, which treat this case as an invalid
4571 // UNC pathname rather than as an alias for the root
4572 // directory of the current drive.
4573 break;
4574 }
4575 end = --dst; // Path does not denote a root directory, so
4576 // remove trailing separator
4577 break;
4578 }
4579 end = dst;
4580 } else {
4581 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4582 *dst++ = *src++;
4583 if (*src) *dst++ = *src++;
4584 end = dst;
4585 } else { // Copy a single-byte character
4586 char c = *src++;
4587 *dst++ = c;
4588 // Space is not a legal ending character
4589 if (c != ' ') end = dst;
4590 }
4591 }
4592 }
4593
4594 *end = '\0';
4595
4596 // For "z:", add "." to work around a bug in the C runtime library
4597 if (colon == dst - 1) {
4598 path[2] = '.';
4599 path[3] = '\0';
4600 }
4601
4602 return path;
4603 }
4604
4605 // This code is a copy of JDK's sysSetLength
4606 // from src/windows/hpi/src/sys_api_md.c
4607
4608 int os::ftruncate(int fd, jlong length) {
4609 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4610 long high = (long)(length >> 32);
4611 DWORD ret;
4612
4613 if (h == (HANDLE)(-1)) {
4614 return -1;
4615 }
4616
4617 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4618 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4619 return -1;
4620 }
4621
4622 if (::SetEndOfFile(h) == FALSE) {
4623 return -1;
4624 }
4625
4626 return 0;
4627 }
4628
4629 int os::get_fileno(FILE* fp) {
4630 return _fileno(fp);
4631 }
4632
4633 // This code is a copy of JDK's sysSync
4634 // from src/windows/hpi/src/sys_api_md.c
4635 // except for the legacy workaround for a bug in Win 98
4636
4637 int os::fsync(int fd) {
4638 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4639
4640 if ((!::FlushFileBuffers(handle)) &&
4641 (GetLastError() != ERROR_ACCESS_DENIED)) {
4642 // from winerror.h
4643 return -1;
4644 }
4645 return 0;
4646 }
4647
4648 static int nonSeekAvailable(int, long *);
4649 static int stdinAvailable(int, long *);
4650
4651 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4652 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4653
4654 // This code is a copy of JDK's sysAvailable
4655 // from src/windows/hpi/src/sys_api_md.c
4656
4657 int os::available(int fd, jlong *bytes) {
4658 jlong cur, end;
4659 struct _stati64 stbuf64;
4660
4661 if (::_fstati64(fd, &stbuf64) >= 0) {
4662 int mode = stbuf64.st_mode;
4663 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4664 int ret;
4665 long lpbytes;
4666 if (fd == 0) {
4667 ret = stdinAvailable(fd, &lpbytes);
4668 } else {
4669 ret = nonSeekAvailable(fd, &lpbytes);
4670 }
4671 (*bytes) = (jlong)(lpbytes);
4672 return ret;
4673 }
4674 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4675 return FALSE;
4676 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4677 return FALSE;
4678 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4679 return FALSE;
4680 }
4681 *bytes = end - cur;
4682 return TRUE;
4683 } else {
4684 return FALSE;
4685 }
4686 }
4687
4688 void os::flockfile(FILE* fp) {
4689 _lock_file(fp);
4690 }
4691
4692 void os::funlockfile(FILE* fp) {
4693 _unlock_file(fp);
4694 }
4695
4696 // This code is a copy of JDK's nonSeekAvailable
4697 // from src/windows/hpi/src/sys_api_md.c
4698
4699 static int nonSeekAvailable(int fd, long *pbytes) {
4700 // This is used for available on non-seekable devices
4701 // (like both named and anonymous pipes, such as pipes
4702 // connected to an exec'd process).
4703 // Standard Input is a special case.
4704 HANDLE han;
4705
4706 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4707 return FALSE;
4708 }
4709
4710 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4711 // PeekNamedPipe fails when at EOF. In that case we
4712 // simply make *pbytes = 0 which is consistent with the
4713 // behavior we get on Solaris when an fd is at EOF.
4714 // The only alternative is to raise an Exception,
4715 // which isn't really warranted.
4716 //
4717 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4718 return FALSE;
4719 }
4720 *pbytes = 0;
4721 }
4722 return TRUE;
4723 }
4724
4725 #define MAX_INPUT_EVENTS 2000
4726
4727 // This code is a copy of JDK's stdinAvailable
4728 // from src/windows/hpi/src/sys_api_md.c
4729
4730 static int stdinAvailable(int fd, long *pbytes) {
4731 HANDLE han;
4732 DWORD numEventsRead = 0; // Number of events read from buffer
4733 DWORD numEvents = 0; // Number of events in buffer
4734 DWORD i = 0; // Loop index
4735 DWORD curLength = 0; // Position marker
4736 DWORD actualLength = 0; // Number of bytes readable
4737 BOOL error = FALSE; // Error holder
4738 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4739
4740 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4741 return FALSE;
4742 }
4743
4744 // Construct an array of input records in the console buffer
4745 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4746 if (error == 0) {
4747 return nonSeekAvailable(fd, pbytes);
4748 }
4749
4750 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4751 if (numEvents > MAX_INPUT_EVENTS) {
4752 numEvents = MAX_INPUT_EVENTS;
4753 }
4754
4755 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4756 if (lpBuffer == NULL) {
4757 return FALSE;
4758 }
4759
4760 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4761 if (error == 0) {
4762 os::free(lpBuffer);
4763 return FALSE;
4764 }
4765
4766 // Examine input records for the number of bytes available
4767 for (i=0; i<numEvents; i++) {
4768 if (lpBuffer[i].EventType == KEY_EVENT) {
4769
4770 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4771 &(lpBuffer[i].Event);
4772 if (keyRecord->bKeyDown == TRUE) {
4773 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4774 curLength++;
4775 if (*keyPressed == '\r') {
4776 actualLength = curLength;
4777 }
4778 }
4779 }
4780 }
4781
4782 if (lpBuffer != NULL) {
4783 os::free(lpBuffer);
4784 }
4785
4786 *pbytes = (long) actualLength;
4787 return TRUE;
4788 }
4789
4790 // Map a block of memory.
4791 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4792 char *addr, size_t bytes, bool read_only,
4793 bool allow_exec) {
4794 HANDLE hFile;
4795 char* base;
4796
4797 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4798 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4799 if (hFile == NULL) {
4800 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4801 return NULL;
4802 }
4803
4804 if (allow_exec) {
4805 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4806 // unless it comes from a PE image (which the shared archive is not.)
4807 // Even VirtualProtect refuses to give execute access to mapped memory
4808 // that was not previously executable.
4809 //
4810 // Instead, stick the executable region in anonymous memory. Yuck.
4811 // Penalty is that ~4 pages will not be shareable - in the future
4812 // we might consider DLLizing the shared archive with a proper PE
4813 // header so that mapping executable + sharing is possible.
4814
4815 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4816 PAGE_READWRITE);
4817 if (base == NULL) {
4818 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4819 CloseHandle(hFile);
4820 return NULL;
4821 }
4822
4823 DWORD bytes_read;
4824 OVERLAPPED overlapped;
4825 overlapped.Offset = (DWORD)file_offset;
4826 overlapped.OffsetHigh = 0;
4827 overlapped.hEvent = NULL;
4828 // ReadFile guarantees that if the return value is true, the requested
4829 // number of bytes were read before returning.
4830 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4831 if (!res) {
4832 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4833 release_memory(base, bytes);
4834 CloseHandle(hFile);
4835 return NULL;
4836 }
4837 } else {
4838 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4839 NULL /* file_name */);
4840 if (hMap == NULL) {
4841 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4842 CloseHandle(hFile);
4843 return NULL;
4844 }
4845
4846 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4847 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4848 (DWORD)bytes, addr);
4849 if (base == NULL) {
4850 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4851 CloseHandle(hMap);
4852 CloseHandle(hFile);
4853 return NULL;
4854 }
4855
4856 if (CloseHandle(hMap) == 0) {
4857 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4858 CloseHandle(hFile);
4859 return base;
4860 }
4861 }
4862
4863 if (allow_exec) {
4864 DWORD old_protect;
4865 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4866 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4867
4868 if (!res) {
4869 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4870 // Don't consider this a hard error, on IA32 even if the
4871 // VirtualProtect fails, we should still be able to execute
4872 CloseHandle(hFile);
4873 return base;
4874 }
4875 }
4876
4877 if (CloseHandle(hFile) == 0) {
4878 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4879 return base;
4880 }
4881
4882 return base;
4883 }
4884
4885
4886 // Remap a block of memory.
4887 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4888 char *addr, size_t bytes, bool read_only,
4889 bool allow_exec) {
4890 // This OS does not allow existing memory maps to be remapped so we
4891 // have to unmap the memory before we remap it.
4892 if (!os::unmap_memory(addr, bytes)) {
4893 return NULL;
4894 }
4895
4896 // There is a very small theoretical window between the unmap_memory()
4897 // call above and the map_memory() call below where a thread in native
4898 // code may be able to access an address that is no longer mapped.
4899
4900 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4901 read_only, allow_exec);
4902 }
4903
4904
4905 // Unmap a block of memory.
4906 // Returns true=success, otherwise false.
4907
4908 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4909 MEMORY_BASIC_INFORMATION mem_info;
4910 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
4911 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
4912 return false;
4913 }
4914
4915 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
4916 // Instead, executable region was allocated using VirtualAlloc(). See
4917 // pd_map_memory() above.
4918 //
4919 // The following flags should match the 'exec_access' flages used for
4920 // VirtualProtect() in pd_map_memory().
4921 if (mem_info.Protect == PAGE_EXECUTE_READ ||
4922 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
4923 return pd_release_memory(addr, bytes);
4924 }
4925
4926 BOOL result = UnmapViewOfFile(addr);
4927 if (result == 0) {
4928 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
4929 return false;
4930 }
4931 return true;
4932 }
4933
4934 void os::pause() {
4935 char filename[MAX_PATH];
4936 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4937 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4938 } else {
4939 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4940 }
4941
4942 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4943 if (fd != -1) {
4944 struct stat buf;
4945 ::close(fd);
4946 while (::stat(filename, &buf) == 0) {
4947 Sleep(100);
4948 }
4949 } else {
4950 jio_fprintf(stderr,
4951 "Could not open pause file '%s', continuing immediately.\n", filename);
4952 }
4953 }
4954
4955 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
4956 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
4957 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
4958
4959 os::ThreadCrashProtection::ThreadCrashProtection() {
4960 }
4961
4962 // See the caveats for this class in os_windows.hpp
4963 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4964 // into this method and returns false. If no OS EXCEPTION was raised, returns
4965 // true.
4966 // The callback is supposed to provide the method that should be protected.
4967 //
4968 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4969
4970 Thread::muxAcquire(&_crash_mux, "CrashProtection");
4971
4972 _protected_thread = Thread::current_or_null();
4973 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
4974
4975 bool success = true;
4976 __try {
4977 _crash_protection = this;
4978 cb.call();
4979 } __except(EXCEPTION_EXECUTE_HANDLER) {
4980 // only for protection, nothing to do
4981 success = false;
4982 }
4983 _crash_protection = NULL;
4984 _protected_thread = NULL;
4985 Thread::muxRelease(&_crash_mux);
4986 return success;
4987 }
4988
4989 // An Event wraps a win32 "CreateEvent" kernel handle.
4990 //
4991 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4992 //
4993 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4994 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4995 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4996 // In addition, an unpark() operation might fetch the handle field, but the
4997 // event could recycle between the fetch and the SetEvent() operation.
4998 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4999 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5000 // on an stale but recycled handle would be harmless, but in practice this might
5001 // confuse other non-Sun code, so it's not a viable approach.
5002 //
5003 // 2: Once a win32 event handle is associated with an Event, it remains associated
5004 // with the Event. The event handle is never closed. This could be construed
5005 // as handle leakage, but only up to the maximum # of threads that have been extant
5006 // at any one time. This shouldn't be an issue, as windows platforms typically
5007 // permit a process to have hundreds of thousands of open handles.
5008 //
5009 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5010 // and release unused handles.
5011 //
5012 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5013 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5014 //
5015 // 5. Use an RCU-like mechanism (Read-Copy Update).
5016 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5017 //
5018 // We use (2).
5019 //
5020 // TODO-FIXME:
5021 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5022 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5023 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5024 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5025 // into a single win32 CreateEvent() handle.
5026 //
5027 // Assumption:
5028 // Only one parker can exist on an event, which is why we allocate
5029 // them per-thread. Multiple unparkers can coexist.
5030 //
5031 // _Event transitions in park()
5032 // -1 => -1 : illegal
5033 // 1 => 0 : pass - return immediately
5034 // 0 => -1 : block; then set _Event to 0 before returning
5035 //
5036 // _Event transitions in unpark()
5037 // 0 => 1 : just return
5038 // 1 => 1 : just return
5039 // -1 => either 0 or 1; must signal target thread
5040 // That is, we can safely transition _Event from -1 to either
5041 // 0 or 1.
5042 //
5043 // _Event serves as a restricted-range semaphore.
5044 // -1 : thread is blocked, i.e. there is a waiter
5045 // 0 : neutral: thread is running or ready,
5046 // could have been signaled after a wait started
5047 // 1 : signaled - thread is running or ready
5048 //
5049 // Another possible encoding of _Event would be with
5050 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5051 //
5052
5053 int os::PlatformEvent::park(jlong Millis) {
5054 // Transitions for _Event:
5055 // -1 => -1 : illegal
5056 // 1 => 0 : pass - return immediately
5057 // 0 => -1 : block; then set _Event to 0 before returning
5058
5059 guarantee(_ParkHandle != NULL , "Invariant");
5060 guarantee(Millis > 0 , "Invariant");
5061
5062 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5063 // the initial park() operation.
5064 // Consider: use atomic decrement instead of CAS-loop
5065
5066 int v;
5067 for (;;) {
5068 v = _Event;
5069 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5070 }
5071 guarantee((v == 0) || (v == 1), "invariant");
5072 if (v != 0) return OS_OK;
5073
5074 // Do this the hard way by blocking ...
5075 // TODO: consider a brief spin here, gated on the success of recent
5076 // spin attempts by this thread.
5077 //
5078 // We decompose long timeouts into series of shorter timed waits.
5079 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5080 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5081 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5082 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5083 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5084 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5085 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5086 // for the already waited time. This policy does not admit any new outcomes.
5087 // In the future, however, we might want to track the accumulated wait time and
5088 // adjust Millis accordingly if we encounter a spurious wakeup.
5089
5090 const int MAXTIMEOUT = 0x10000000;
5091 DWORD rv = WAIT_TIMEOUT;
5092 while (_Event < 0 && Millis > 0) {
5093 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5094 if (Millis > MAXTIMEOUT) {
5095 prd = MAXTIMEOUT;
5096 }
5097 rv = ::WaitForSingleObject(_ParkHandle, prd);
5098 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5099 if (rv == WAIT_TIMEOUT) {
5100 Millis -= prd;
5101 }
5102 }
5103 v = _Event;
5104 _Event = 0;
5105 // see comment at end of os::PlatformEvent::park() below:
5106 OrderAccess::fence();
5107 // If we encounter a nearly simultanous timeout expiry and unpark()
5108 // we return OS_OK indicating we awoke via unpark().
5109 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5110 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5111 }
5112
5113 void os::PlatformEvent::park() {
5114 // Transitions for _Event:
5115 // -1 => -1 : illegal
5116 // 1 => 0 : pass - return immediately
5117 // 0 => -1 : block; then set _Event to 0 before returning
5118
5119 guarantee(_ParkHandle != NULL, "Invariant");
5120 // Invariant: Only the thread associated with the Event/PlatformEvent
5121 // may call park().
5122 // Consider: use atomic decrement instead of CAS-loop
5123 int v;
5124 for (;;) {
5125 v = _Event;
5126 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5127 }
5128 guarantee((v == 0) || (v == 1), "invariant");
5129 if (v != 0) return;
5130
5131 // Do this the hard way by blocking ...
5132 // TODO: consider a brief spin here, gated on the success of recent
5133 // spin attempts by this thread.
5134 while (_Event < 0) {
5135 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5136 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5137 }
5138
5139 // Usually we'll find _Event == 0 at this point, but as
5140 // an optional optimization we clear it, just in case can
5141 // multiple unpark() operations drove _Event up to 1.
5142 _Event = 0;
5143 OrderAccess::fence();
5144 guarantee(_Event >= 0, "invariant");
5145 }
5146
5147 void os::PlatformEvent::unpark() {
5148 guarantee(_ParkHandle != NULL, "Invariant");
5149
5150 // Transitions for _Event:
5151 // 0 => 1 : just return
5152 // 1 => 1 : just return
5153 // -1 => either 0 or 1; must signal target thread
5154 // That is, we can safely transition _Event from -1 to either
5155 // 0 or 1.
5156 // See also: "Semaphores in Plan 9" by Mullender & Cox
5157 //
5158 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5159 // that it will take two back-to-back park() calls for the owning
5160 // thread to block. This has the benefit of forcing a spurious return
5161 // from the first park() call after an unpark() call which will help
5162 // shake out uses of park() and unpark() without condition variables.
5163
5164 if (Atomic::xchg(1, &_Event) >= 0) return;
5165
5166 ::SetEvent(_ParkHandle);
5167 }
5168
5169
5170 // JSR166
5171 // -------------------------------------------------------
5172
5173 // The Windows implementation of Park is very straightforward: Basic
5174 // operations on Win32 Events turn out to have the right semantics to
5175 // use them directly. We opportunistically resuse the event inherited
5176 // from Monitor.
5177
5178 void Parker::park(bool isAbsolute, jlong time) {
5179 guarantee(_ParkEvent != NULL, "invariant");
5180 // First, demultiplex/decode time arguments
5181 if (time < 0) { // don't wait
5182 return;
5183 } else if (time == 0 && !isAbsolute) {
5184 time = INFINITE;
5185 } else if (isAbsolute) {
5186 time -= os::javaTimeMillis(); // convert to relative time
5187 if (time <= 0) { // already elapsed
5188 return;
5189 }
5190 } else { // relative
5191 time /= 1000000; // Must coarsen from nanos to millis
5192 if (time == 0) { // Wait for the minimal time unit if zero
5193 time = 1;
5194 }
5195 }
5196
5197 JavaThread* thread = JavaThread::current();
5198
5199 // Don't wait if interrupted or already triggered
5200 if (Thread::is_interrupted(thread, false) ||
5201 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5202 ResetEvent(_ParkEvent);
5203 return;
5204 } else {
5205 ThreadBlockInVM tbivm(thread);
5206 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5207 thread->set_suspend_equivalent();
5208
5209 WaitForSingleObject(_ParkEvent, time);
5210 ResetEvent(_ParkEvent);
5211
5212 // If externally suspended while waiting, re-suspend
5213 if (thread->handle_special_suspend_equivalent_condition()) {
5214 thread->java_suspend_self();
5215 }
5216 }
5217 }
5218
5219 void Parker::unpark() {
5220 guarantee(_ParkEvent != NULL, "invariant");
5221 SetEvent(_ParkEvent);
5222 }
5223
5224 // Run the specified command in a separate process. Return its exit value,
5225 // or -1 on failure (e.g. can't create a new process).
5226 int os::fork_and_exec(char* cmd) {
5227 STARTUPINFO si;
5228 PROCESS_INFORMATION pi;
5229 DWORD exit_code;
5230
5231 char * cmd_string;
5232 char * cmd_prefix = "cmd /C ";
5233 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5234 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5235 if (cmd_string == NULL) {
5236 return -1;
5237 }
5238 cmd_string[0] = '\0';
5239 strcat(cmd_string, cmd_prefix);
5240 strcat(cmd_string, cmd);
5241
5242 // now replace all '\n' with '&'
5243 char * substring = cmd_string;
5244 while ((substring = strchr(substring, '\n')) != NULL) {
5245 substring[0] = '&';
5246 substring++;
5247 }
5248 memset(&si, 0, sizeof(si));
5249 si.cb = sizeof(si);
5250 memset(&pi, 0, sizeof(pi));
5251 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5252 cmd_string, // command line
5253 NULL, // process security attribute
5254 NULL, // thread security attribute
5255 TRUE, // inherits system handles
5256 0, // no creation flags
5257 NULL, // use parent's environment block
5258 NULL, // use parent's starting directory
5259 &si, // (in) startup information
5260 &pi); // (out) process information
5261
5262 if (rslt) {
5263 // Wait until child process exits.
5264 WaitForSingleObject(pi.hProcess, INFINITE);
5265
5266 GetExitCodeProcess(pi.hProcess, &exit_code);
5267
5268 // Close process and thread handles.
5269 CloseHandle(pi.hProcess);
5270 CloseHandle(pi.hThread);
5271 } else {
5272 exit_code = -1;
5273 }
5274
5275 FREE_C_HEAP_ARRAY(char, cmd_string);
5276 return (int)exit_code;
5277 }
5278
5279 bool os::find(address addr, outputStream* st) {
5280 int offset = -1;
5281 bool result = false;
5282 char buf[256];
5283 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5284 st->print(PTR_FORMAT " ", addr);
5285 if (strlen(buf) < sizeof(buf) - 1) {
5286 char* p = strrchr(buf, '\\');
5287 if (p) {
5288 st->print("%s", p + 1);
5289 } else {
5290 st->print("%s", buf);
5291 }
5292 } else {
5293 // The library name is probably truncated. Let's omit the library name.
5294 // See also JDK-8147512.
5295 }
5296 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5297 st->print("::%s + 0x%x", buf, offset);
5298 }
5299 st->cr();
5300 result = true;
5301 }
5302 return result;
5303 }
5304
5305 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5306 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5307
5308 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
5309 JavaThread* thread = JavaThread::current();
5310 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5311 address addr = (address) exceptionRecord->ExceptionInformation[1];
5312
5313 if (os::is_memory_serialize_page(thread, addr)) {
5314 return EXCEPTION_CONTINUE_EXECUTION;
5315 }
5316 }
5317
5318 return EXCEPTION_CONTINUE_SEARCH;
5319 }
5320
5321 static jint initSock() {
5322 WSADATA wsadata;
5323
5324 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5325 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5326 ::GetLastError());
5327 return JNI_ERR;
5328 }
5329 return JNI_OK;
5330 }
5331
5332 struct hostent* os::get_host_by_name(char* name) {
5333 return (struct hostent*)gethostbyname(name);
5334 }
5335
5336 int os::socket_close(int fd) {
5337 return ::closesocket(fd);
5338 }
5339
5340 int os::socket(int domain, int type, int protocol) {
5341 return ::socket(domain, type, protocol);
5342 }
5343
5344 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5345 return ::connect(fd, him, len);
5346 }
5347
5348 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5349 return ::recv(fd, buf, (int)nBytes, flags);
5350 }
5351
5352 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5353 return ::send(fd, buf, (int)nBytes, flags);
5354 }
5355
5356 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5357 return ::send(fd, buf, (int)nBytes, flags);
5358 }
5359
5360 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5361 #if defined(IA32)
5362 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5363 #elif defined (AMD64)
5364 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5365 #endif
5366
5367 // returns true if thread could be suspended,
5368 // false otherwise
5369 static bool do_suspend(HANDLE* h) {
5370 if (h != NULL) {
5371 if (SuspendThread(*h) != ~0) {
5372 return true;
5373 }
5374 }
5375 return false;
5376 }
5377
5378 // resume the thread
5379 // calling resume on an active thread is a no-op
5380 static void do_resume(HANDLE* h) {
5381 if (h != NULL) {
5382 ResumeThread(*h);
5383 }
5384 }
5385
5386 // retrieve a suspend/resume context capable handle
5387 // from the tid. Caller validates handle return value.
5388 void get_thread_handle_for_extended_context(HANDLE* h,
5389 OSThread::thread_id_t tid) {
5390 if (h != NULL) {
5391 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5392 }
5393 }
5394
5395 // Thread sampling implementation
5396 //
5397 void os::SuspendedThreadTask::internal_do_task() {
5398 CONTEXT ctxt;
5399 HANDLE h = NULL;
5400
5401 // get context capable handle for thread
5402 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5403
5404 // sanity
5405 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5406 return;
5407 }
5408
5409 // suspend the thread
5410 if (do_suspend(&h)) {
5411 ctxt.ContextFlags = sampling_context_flags;
5412 // get thread context
5413 GetThreadContext(h, &ctxt);
5414 SuspendedThreadTaskContext context(_thread, &ctxt);
5415 // pass context to Thread Sampling impl
5416 do_task(context);
5417 // resume thread
5418 do_resume(&h);
5419 }
5420
5421 // close handle
5422 CloseHandle(h);
5423 }
5424
5425 bool os::start_debugging(char *buf, int buflen) {
5426 int len = (int)strlen(buf);
5427 char *p = &buf[len];
5428
5429 jio_snprintf(p, buflen-len,
5430 "\n\n"
5431 "Do you want to debug the problem?\n\n"
5432 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5433 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5434 "Otherwise, select 'No' to abort...",
5435 os::current_process_id(), os::current_thread_id());
5436
5437 bool yes = os::message_box("Unexpected Error", buf);
5438
5439 if (yes) {
5440 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5441 // exception. If VM is running inside a debugger, the debugger will
5442 // catch the exception. Otherwise, the breakpoint exception will reach
5443 // the default windows exception handler, which can spawn a debugger and
5444 // automatically attach to the dying VM.
5445 os::breakpoint();
5446 yes = false;
5447 }
5448 return yes;
5449 }
5450
5451 void* os::get_default_process_handle() {
5452 return (void*)GetModuleHandle(NULL);
5453 }
5454
5455 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5456 // which is used to find statically linked in agents.
5457 // Additionally for windows, takes into account __stdcall names.
5458 // Parameters:
5459 // sym_name: Symbol in library we are looking for
5460 // lib_name: Name of library to look in, NULL for shared libs.
5461 // is_absolute_path == true if lib_name is absolute path to agent
5462 // such as "C:/a/b/L.dll"
5463 // == false if only the base name of the library is passed in
5464 // such as "L"
5465 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5466 bool is_absolute_path) {
5467 char *agent_entry_name;
5468 size_t len;
5469 size_t name_len;
5470 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5471 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5472 const char *start;
5473
5474 if (lib_name != NULL) {
5475 len = name_len = strlen(lib_name);
5476 if (is_absolute_path) {
5477 // Need to strip path, prefix and suffix
5478 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5479 lib_name = ++start;
5480 } else {
5481 // Need to check for drive prefix
5482 if ((start = strchr(lib_name, ':')) != NULL) {
5483 lib_name = ++start;
5484 }
5485 }
5486 if (len <= (prefix_len + suffix_len)) {
5487 return NULL;
5488 }
5489 lib_name += prefix_len;
5490 name_len = strlen(lib_name) - suffix_len;
5491 }
5492 }
5493 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5494 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5495 if (agent_entry_name == NULL) {
5496 return NULL;
5497 }
5498 if (lib_name != NULL) {
5499 const char *p = strrchr(sym_name, '@');
5500 if (p != NULL && p != sym_name) {
5501 // sym_name == _Agent_OnLoad@XX
5502 strncpy(agent_entry_name, sym_name, (p - sym_name));
5503 agent_entry_name[(p-sym_name)] = '\0';
5504 // agent_entry_name == _Agent_OnLoad
5505 strcat(agent_entry_name, "_");
5506 strncat(agent_entry_name, lib_name, name_len);
5507 strcat(agent_entry_name, p);
5508 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5509 } else {
5510 strcpy(agent_entry_name, sym_name);
5511 strcat(agent_entry_name, "_");
5512 strncat(agent_entry_name, lib_name, name_len);
5513 }
5514 } else {
5515 strcpy(agent_entry_name, sym_name);
5516 }
5517 return agent_entry_name;
5518 }
5519
5520 #ifndef PRODUCT
5521
5522 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5523 // contiguous memory block at a particular address.
5524 // The test first tries to find a good approximate address to allocate at by using the same
5525 // method to allocate some memory at any address. The test then tries to allocate memory in
5526 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5527 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5528 // the previously allocated memory is available for allocation. The only actual failure
5529 // that is reported is when the test tries to allocate at a particular location but gets a
5530 // different valid one. A NULL return value at this point is not considered an error but may
5531 // be legitimate.
5532 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5533 void TestReserveMemorySpecial_test() {
5534 if (!UseLargePages) {
5535 if (VerboseInternalVMTests) {
5536 tty->print("Skipping test because large pages are disabled");
5537 }
5538 return;
5539 }
5540 // save current value of globals
5541 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5542 bool old_use_numa_interleaving = UseNUMAInterleaving;
5543
5544 // set globals to make sure we hit the correct code path
5545 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5546
5547 // do an allocation at an address selected by the OS to get a good one.
5548 const size_t large_allocation_size = os::large_page_size() * 4;
5549 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5550 if (result == NULL) {
5551 if (VerboseInternalVMTests) {
5552 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5553 large_allocation_size);
5554 }
5555 } else {
5556 os::release_memory_special(result, large_allocation_size);
5557
5558 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5559 // we managed to get it once.
5560 const size_t expected_allocation_size = os::large_page_size();
5561 char* expected_location = result + os::large_page_size();
5562 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5563 if (actual_location == NULL) {
5564 if (VerboseInternalVMTests) {
5565 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5566 expected_location, large_allocation_size);
5567 }
5568 } else {
5569 // release memory
5570 os::release_memory_special(actual_location, expected_allocation_size);
5571 // only now check, after releasing any memory to avoid any leaks.
5572 assert(actual_location == expected_location,
5573 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5574 expected_location, expected_allocation_size, actual_location);
5575 }
5576 }
5577
5578 // restore globals
5579 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5580 UseNUMAInterleaving = old_use_numa_interleaving;
5581 }
5582 #endif // PRODUCT
5583
5584 /*
5585 All the defined signal names for Windows.
5586
5587 NOTE that not all of these names are accepted by FindSignal!
5588
5589 For various reasons some of these may be rejected at runtime.
5590
5591 Here are the names currently accepted by a user of sun.misc.Signal with
5592 1.4.1 (ignoring potential interaction with use of chaining, etc):
5593
5594 (LIST TBD)
5595
5596 */
5597 int os::get_signal_number(const char* name) {
5598 static const struct {
5599 char* name;
5600 int number;
5601 } siglabels [] =
5602 // derived from version 6.0 VC98/include/signal.h
5603 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5604 "FPE", SIGFPE, // floating point exception
5605 "SEGV", SIGSEGV, // segment violation
5606 "INT", SIGINT, // interrupt
5607 "TERM", SIGTERM, // software term signal from kill
5608 "BREAK", SIGBREAK, // Ctrl-Break sequence
5609 "ILL", SIGILL}; // illegal instruction
5610 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5611 if (strcmp(name, siglabels[i].name) == 0) {
5612 return siglabels[i].number;
5613 }
5614 }
5615 return -1;
5616 }
5617
5618 // Fast current thread access
5619
5620 int os::win32::_thread_ptr_offset = 0;
5621
5622 static void call_wrapper_dummy() {}
5623
5624 // We need to call the os_exception_wrapper once so that it sets
5625 // up the offset from FS of the thread pointer.
5626 void os::win32::initialize_thread_ptr_offset() {
5627 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5628 NULL, NULL, NULL, NULL);
5629 }