1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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 "logging/logStream.hpp"
40 #include "memory/allocation.inline.hpp"
41 #include "memory/filemap.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "os_share_windows.hpp"
44 #include "os_windows.inline.hpp"
45 #include "prims/jniFastGetField.hpp"
46 #include "prims/jvm_misc.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/atomic.hpp"
49 #include "runtime/extendedPC.hpp"
50 #include "runtime/globals.hpp"
51 #include "runtime/interfaceSupport.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "runtime/objectMonitor.hpp"
56 #include "runtime/orderAccess.hpp"
57 #include "runtime/osThread.hpp"
58 #include "runtime/perfMemory.hpp"
59 #include "runtime/sharedRuntime.hpp"
60 #include "runtime/statSampler.hpp"
61 #include "runtime/stubRoutines.hpp"
62 #include "runtime/thread.inline.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/timer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/memTracker.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/decoder.hpp"
71 #include "utilities/defaultStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/growableArray.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/vmError.hpp"
76 #include "symbolengine.hpp"
77 #include "windbghelp.hpp"
78
79
80 #ifdef _DEBUG
81 #include <crtdbg.h>
82 #endif
83
84
85 #include <windows.h>
86 #include <sys/types.h>
87 #include <sys/stat.h>
88 #include <sys/timeb.h>
89 #include <objidl.h>
90 #include <shlobj.h>
91
92 #include <malloc.h>
93 #include <signal.h>
94 #include <direct.h>
95 #include <errno.h>
96 #include <fcntl.h>
97 #include <io.h>
98 #include <process.h> // For _beginthreadex(), _endthreadex()
99 #include <imagehlp.h> // For os::dll_address_to_function_name
100 // for enumerating dll libraries
101 #include <vdmdbg.h>
102 #include <psapi.h>
103 #include <mmsystem.h>
104 #include <winsock2.h>
105
106 // for timer info max values which include all bits
107 #define ALL_64_BITS CONST64(-1)
108
109 // For DLL loading/load error detection
110 // Values of PE COFF
111 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
112 #define IMAGE_FILE_SIGNATURE_LENGTH 4
113
114 static HANDLE main_process;
115 static HANDLE main_thread;
116 static int main_thread_id;
117
118 static FILETIME process_creation_time;
119 static FILETIME process_exit_time;
120 static FILETIME process_user_time;
121 static FILETIME process_kernel_time;
122
123 #ifdef _M_AMD64
124 #define __CPU__ amd64
125 #else
126 #define __CPU__ i486
127 #endif
128
129 #if INCLUDE_AOT
130 PVOID topLevelVectoredExceptionHandler = NULL;
131 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
132 #endif
133
134 // save DLL module handle, used by GetModuleFileName
135
136 HINSTANCE vm_lib_handle;
137
138 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
139 switch (reason) {
140 case DLL_PROCESS_ATTACH:
141 vm_lib_handle = hinst;
142 if (ForceTimeHighResolution) {
143 timeBeginPeriod(1L);
144 }
145 WindowsDbgHelp::pre_initialize();
146 SymbolEngine::pre_initialize();
147 break;
148 case DLL_PROCESS_DETACH:
149 if (ForceTimeHighResolution) {
150 timeEndPeriod(1L);
151 }
152 #if INCLUDE_AOT
153 if (topLevelVectoredExceptionHandler != NULL) {
154 RemoveVectoredExceptionHandler(topLevelVectoredExceptionHandler);
155 topLevelVectoredExceptionHandler = NULL;
156 }
157 #endif
158 break;
159 default:
160 break;
161 }
162 return true;
163 }
164
165 static inline double fileTimeAsDouble(FILETIME* time) {
166 const double high = (double) ((unsigned int) ~0);
167 const double split = 10000000.0;
168 double result = (time->dwLowDateTime / split) +
169 time->dwHighDateTime * (high/split);
170 return result;
171 }
172
173 // Implementation of os
174
175 bool os::unsetenv(const char* name) {
176 assert(name != NULL, "Null pointer");
177 return (SetEnvironmentVariable(name, NULL) == TRUE);
178 }
179
180 // No setuid programs under Windows.
181 bool os::have_special_privileges() {
182 return false;
183 }
184
185
186 // This method is a periodic task to check for misbehaving JNI applications
187 // under CheckJNI, we can add any periodic checks here.
188 // For Windows at the moment does nothing
189 void os::run_periodic_checks() {
190 return;
191 }
192
193 // previous UnhandledExceptionFilter, if there is one
194 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
195
196 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
197
198 void os::init_system_properties_values() {
199 // sysclasspath, java_home, dll_dir
200 {
201 char *home_path;
202 char *dll_path;
203 char *pslash;
204 char *bin = "\\bin";
205 char home_dir[MAX_PATH + 1];
206 char *alt_home_dir = ::getenv("_ALT_JAVA_HOME_DIR");
207
208 if (alt_home_dir != NULL) {
209 strncpy(home_dir, alt_home_dir, MAX_PATH + 1);
210 home_dir[MAX_PATH] = '\0';
211 } else {
212 os::jvm_path(home_dir, sizeof(home_dir));
213 // Found the full path to jvm.dll.
214 // Now cut the path to <java_home>/jre if we can.
215 *(strrchr(home_dir, '\\')) = '\0'; // get rid of \jvm.dll
216 pslash = strrchr(home_dir, '\\');
217 if (pslash != NULL) {
218 *pslash = '\0'; // get rid of \{client|server}
219 pslash = strrchr(home_dir, '\\');
220 if (pslash != NULL) {
221 *pslash = '\0'; // get rid of \bin
222 }
223 }
224 }
225
226 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
227 if (home_path == NULL) {
228 return;
229 }
230 strcpy(home_path, home_dir);
231 Arguments::set_java_home(home_path);
232 FREE_C_HEAP_ARRAY(char, home_path);
233
234 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1,
235 mtInternal);
236 if (dll_path == NULL) {
237 return;
238 }
239 strcpy(dll_path, home_dir);
240 strcat(dll_path, bin);
241 Arguments::set_dll_dir(dll_path);
242 FREE_C_HEAP_ARRAY(char, dll_path);
243
244 if (!set_boot_path('\\', ';')) {
245 vm_exit_during_initialization("Failed setting boot class path.", NULL);
246 }
247 }
248
249 // library_path
250 #define EXT_DIR "\\lib\\ext"
251 #define BIN_DIR "\\bin"
252 #define PACKAGE_DIR "\\Sun\\Java"
253 {
254 // Win32 library search order (See the documentation for LoadLibrary):
255 //
256 // 1. The directory from which application is loaded.
257 // 2. The system wide Java Extensions directory (Java only)
258 // 3. System directory (GetSystemDirectory)
259 // 4. Windows directory (GetWindowsDirectory)
260 // 5. The PATH environment variable
261 // 6. The current directory
262
263 char *library_path;
264 char tmp[MAX_PATH];
265 char *path_str = ::getenv("PATH");
266
267 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
268 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
269
270 library_path[0] = '\0';
271
272 GetModuleFileName(NULL, tmp, sizeof(tmp));
273 *(strrchr(tmp, '\\')) = '\0';
274 strcat(library_path, tmp);
275
276 GetWindowsDirectory(tmp, sizeof(tmp));
277 strcat(library_path, ";");
278 strcat(library_path, tmp);
279 strcat(library_path, PACKAGE_DIR BIN_DIR);
280
281 GetSystemDirectory(tmp, sizeof(tmp));
282 strcat(library_path, ";");
283 strcat(library_path, tmp);
284
285 GetWindowsDirectory(tmp, sizeof(tmp));
286 strcat(library_path, ";");
287 strcat(library_path, tmp);
288
289 if (path_str) {
290 strcat(library_path, ";");
291 strcat(library_path, path_str);
292 }
293
294 strcat(library_path, ";.");
295
296 Arguments::set_library_path(library_path);
297 FREE_C_HEAP_ARRAY(char, library_path);
298 }
299
300 // Default extensions directory
301 {
302 char path[MAX_PATH];
303 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
304 GetWindowsDirectory(path, MAX_PATH);
305 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
306 path, PACKAGE_DIR, EXT_DIR);
307 Arguments::set_ext_dirs(buf);
308 }
309 #undef EXT_DIR
310 #undef BIN_DIR
311 #undef PACKAGE_DIR
312
313 #ifndef _WIN64
314 // set our UnhandledExceptionFilter and save any previous one
315 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
316 #endif
317
318 // Done
319 return;
320 }
321
322 void os::breakpoint() {
323 DebugBreak();
324 }
325
326 // Invoked from the BREAKPOINT Macro
327 extern "C" void breakpoint() {
328 os::breakpoint();
329 }
330
331 // RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
332 // So far, this method is only used by Native Memory Tracking, which is
333 // only supported on Windows XP or later.
334 //
335 int os::get_native_stack(address* stack, int frames, int toSkip) {
336 int captured = RtlCaptureStackBackTrace(toSkip + 1, frames, (PVOID*)stack, NULL);
337 for (int index = captured; index < frames; index ++) {
338 stack[index] = NULL;
339 }
340 return captured;
341 }
342
343
344 // os::current_stack_base()
345 //
346 // Returns the base of the stack, which is the stack's
347 // starting address. This function must be called
348 // while running on the stack of the thread being queried.
349
350 address os::current_stack_base() {
351 MEMORY_BASIC_INFORMATION minfo;
352 address stack_bottom;
353 size_t stack_size;
354
355 VirtualQuery(&minfo, &minfo, sizeof(minfo));
356 stack_bottom = (address)minfo.AllocationBase;
357 stack_size = minfo.RegionSize;
358
359 // Add up the sizes of all the regions with the same
360 // AllocationBase.
361 while (1) {
362 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
363 if (stack_bottom == (address)minfo.AllocationBase) {
364 stack_size += minfo.RegionSize;
365 } else {
366 break;
367 }
368 }
369 return stack_bottom + stack_size;
370 }
371
372 size_t os::current_stack_size() {
373 size_t sz;
374 MEMORY_BASIC_INFORMATION minfo;
375 VirtualQuery(&minfo, &minfo, sizeof(minfo));
376 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
377 return sz;
378 }
379
380 bool os::committed_in_range(address start, size_t size, address& committed_start, size_t& committed_size) {
381 MEMORY_BASIC_INFORMATION minfo;
382 committed_start = NULL;
383 committed_size = 0;
384 address top = start + size;
385 const address start_addr = start;
386 while (start < top) {
387 VirtualQuery(start, &minfo, sizeof(minfo));
388 if ((minfo.State & MEM_COMMIT) == 0) { // not committed
389 if (committed_start != NULL) {
390 break;
391 }
392 } else { // committed
393 if (committed_start == NULL) {
394 committed_start = start;
395 }
396 size_t offset = start - (address)minfo.BaseAddress;
397 committed_size += minfo.RegionSize - offset;
398 }
399 start = (address)minfo.BaseAddress + minfo.RegionSize;
400 }
401
402 if (committed_start == NULL) {
403 assert(committed_size == 0, "Sanity");
404 return false;
405 } else {
406 assert(committed_start >= start_addr && committed_start < top, "Out of range");
407 // current region may go beyond the limit, trim to the limit
408 committed_size = MIN2(committed_size, size_t(top - committed_start));
409 return true;
410 }
411 }
412
413 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
414 const struct tm* time_struct_ptr = localtime(clock);
415 if (time_struct_ptr != NULL) {
416 *res = *time_struct_ptr;
417 return res;
418 }
419 return NULL;
420 }
421
422 struct tm* os::gmtime_pd(const time_t* clock, struct tm* res) {
423 const struct tm* time_struct_ptr = gmtime(clock);
424 if (time_struct_ptr != NULL) {
425 *res = *time_struct_ptr;
426 return res;
427 }
428 return NULL;
429 }
430
431 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
432
433 // Thread start routine for all newly created threads
434 static unsigned __stdcall thread_native_entry(Thread* thread) {
435
436 thread->record_stack_base_and_size();
437
438 // Try to randomize the cache line index of hot stack frames.
439 // This helps when threads of the same stack traces evict each other's
440 // cache lines. The threads can be either from the same JVM instance, or
441 // from different JVM instances. The benefit is especially true for
442 // processors with hyperthreading technology.
443 static int counter = 0;
444 int pid = os::current_process_id();
445 _alloca(((pid ^ counter++) & 7) * 128);
446
447 thread->initialize_thread_current();
448
449 OSThread* osthr = thread->osthread();
450 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
451
452 if (UseNUMA) {
453 int lgrp_id = os::numa_get_group_id();
454 if (lgrp_id != -1) {
455 thread->set_lgrp_id(lgrp_id);
456 }
457 }
458
459 // Diagnostic code to investigate JDK-6573254
460 int res = 30115; // non-java thread
461 if (thread->is_Java_thread()) {
462 res = 20115; // java thread
463 }
464
465 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", os::current_thread_id());
466
467 // Install a win32 structured exception handler around every thread created
468 // by VM, so VM can generate error dump when an exception occurred in non-
469 // Java thread (e.g. VM thread).
470 __try {
471 thread->call_run();
472 } __except(topLevelExceptionFilter(
473 (_EXCEPTION_POINTERS*)_exception_info())) {
474 // Nothing to do.
475 }
476
477 // Note: at this point the thread object may already have deleted itself.
478 // Do not dereference it from here on out.
479
480 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
481
482 // One less thread is executing
483 // When the VMThread gets here, the main thread may have already exited
484 // which frees the CodeHeap containing the Atomic::add code
485 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
486 Atomic::dec(&os::win32::_os_thread_count);
487 }
488
489 // Thread must not return from exit_process_or_thread(), but if it does,
490 // let it proceed to exit normally
491 return (unsigned)os::win32::exit_process_or_thread(os::win32::EPT_THREAD, res);
492 }
493
494 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle,
495 int thread_id) {
496 // Allocate the OSThread object
497 OSThread* osthread = new OSThread(NULL, NULL);
498 if (osthread == NULL) return NULL;
499
500 // Initialize support for Java interrupts
501 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
502 if (interrupt_event == NULL) {
503 delete osthread;
504 return NULL;
505 }
506 osthread->set_interrupt_event(interrupt_event);
507
508 // Store info on the Win32 thread into the OSThread
509 osthread->set_thread_handle(thread_handle);
510 osthread->set_thread_id(thread_id);
511
512 if (UseNUMA) {
513 int lgrp_id = os::numa_get_group_id();
514 if (lgrp_id != -1) {
515 thread->set_lgrp_id(lgrp_id);
516 }
517 }
518
519 // Initial thread state is INITIALIZED, not SUSPENDED
520 osthread->set_state(INITIALIZED);
521
522 return osthread;
523 }
524
525
526 bool os::create_attached_thread(JavaThread* thread) {
527 #ifdef ASSERT
528 thread->verify_not_published();
529 #endif
530 HANDLE thread_h;
531 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
532 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
533 fatal("DuplicateHandle failed\n");
534 }
535 OSThread* osthread = create_os_thread(thread, thread_h,
536 (int)current_thread_id());
537 if (osthread == NULL) {
538 return false;
539 }
540
541 // Initial thread state is RUNNABLE
542 osthread->set_state(RUNNABLE);
543
544 thread->set_osthread(osthread);
545
546 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
547 os::current_thread_id());
548
549 return true;
550 }
551
552 bool os::create_main_thread(JavaThread* thread) {
553 #ifdef ASSERT
554 thread->verify_not_published();
555 #endif
556 if (_starting_thread == NULL) {
557 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
558 if (_starting_thread == NULL) {
559 return false;
560 }
561 }
562
563 // The primordial thread is runnable from the start)
564 _starting_thread->set_state(RUNNABLE);
565
566 thread->set_osthread(_starting_thread);
567 return true;
568 }
569
570 // Helper function to trace _beginthreadex attributes,
571 // similar to os::Posix::describe_pthread_attr()
572 static char* describe_beginthreadex_attributes(char* buf, size_t buflen,
573 size_t stacksize, unsigned initflag) {
574 stringStream ss(buf, buflen);
575 if (stacksize == 0) {
576 ss.print("stacksize: default, ");
577 } else {
578 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
579 }
580 ss.print("flags: ");
581 #define PRINT_FLAG(f) if (initflag & f) ss.print( #f " ");
582 #define ALL(X) \
583 X(CREATE_SUSPENDED) \
584 X(STACK_SIZE_PARAM_IS_A_RESERVATION)
585 ALL(PRINT_FLAG)
586 #undef ALL
587 #undef PRINT_FLAG
588 return buf;
589 }
590
591 // Allocate and initialize a new OSThread
592 bool os::create_thread(Thread* thread, ThreadType thr_type,
593 size_t stack_size) {
594 unsigned thread_id;
595
596 // Allocate the OSThread object
597 OSThread* osthread = new OSThread(NULL, NULL);
598 if (osthread == NULL) {
599 return false;
600 }
601
602 // Initialize support for Java interrupts
603 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
604 if (interrupt_event == NULL) {
605 delete osthread;
606 return false;
607 }
608 osthread->set_interrupt_event(interrupt_event);
609 osthread->set_interrupted(false);
610
611 thread->set_osthread(osthread);
612
613 if (stack_size == 0) {
614 switch (thr_type) {
615 case os::java_thread:
616 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
617 if (JavaThread::stack_size_at_create() > 0) {
618 stack_size = JavaThread::stack_size_at_create();
619 }
620 break;
621 case os::compiler_thread:
622 if (CompilerThreadStackSize > 0) {
623 stack_size = (size_t)(CompilerThreadStackSize * K);
624 break;
625 } // else fall through:
626 // use VMThreadStackSize if CompilerThreadStackSize is not defined
627 case os::vm_thread:
628 case os::pgc_thread:
629 case os::cgc_thread:
630 case os::watcher_thread:
631 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
632 break;
633 }
634 }
635
636 // Create the Win32 thread
637 //
638 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
639 // does not specify stack size. Instead, it specifies the size of
640 // initially committed space. The stack size is determined by
641 // PE header in the executable. If the committed "stack_size" is larger
642 // than default value in the PE header, the stack is rounded up to the
643 // nearest multiple of 1MB. For example if the launcher has default
644 // stack size of 320k, specifying any size less than 320k does not
645 // affect the actual stack size at all, it only affects the initial
646 // commitment. On the other hand, specifying 'stack_size' larger than
647 // default value may cause significant increase in memory usage, because
648 // not only the stack space will be rounded up to MB, but also the
649 // entire space is committed upfront.
650 //
651 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
652 // for CreateThread() that can treat 'stack_size' as stack size. However we
653 // are not supposed to call CreateThread() directly according to MSDN
654 // document because JVM uses C runtime library. The good news is that the
655 // flag appears to work with _beginthredex() as well.
656
657 const unsigned initflag = CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION;
658 HANDLE thread_handle =
659 (HANDLE)_beginthreadex(NULL,
660 (unsigned)stack_size,
661 (unsigned (__stdcall *)(void*)) thread_native_entry,
662 thread,
663 initflag,
664 &thread_id);
665
666 char buf[64];
667 if (thread_handle != NULL) {
668 log_info(os, thread)("Thread started (tid: %u, attributes: %s)",
669 thread_id, describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
670 } else {
671 log_warning(os, thread)("Failed to start thread - _beginthreadex failed (%s) for attributes: %s.",
672 os::errno_name(errno), describe_beginthreadex_attributes(buf, sizeof(buf), stack_size, initflag));
673 // Log some OS information which might explain why creating the thread failed.
674 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
675 LogStream st(Log(os, thread)::info());
676 os::print_memory_info(&st);
677 }
678
679 if (thread_handle == NULL) {
680 // Need to clean up stuff we've allocated so far
681 CloseHandle(osthread->interrupt_event());
682 thread->set_osthread(NULL);
683 delete osthread;
684 return false;
685 }
686
687 Atomic::inc(&os::win32::_os_thread_count);
688
689 // Store info on the Win32 thread into the OSThread
690 osthread->set_thread_handle(thread_handle);
691 osthread->set_thread_id(thread_id);
692
693 // Initial thread state is INITIALIZED, not SUSPENDED
694 osthread->set_state(INITIALIZED);
695
696 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
697 return true;
698 }
699
700
701 // Free Win32 resources related to the OSThread
702 void os::free_thread(OSThread* osthread) {
703 assert(osthread != NULL, "osthread not set");
704
705 // We are told to free resources of the argument thread,
706 // but we can only really operate on the current thread.
707 assert(Thread::current()->osthread() == osthread,
708 "os::free_thread but not current thread");
709
710 CloseHandle(osthread->thread_handle());
711 CloseHandle(osthread->interrupt_event());
712 delete osthread;
713 }
714
715 static jlong first_filetime;
716 static jlong initial_performance_count;
717 static jlong performance_frequency;
718
719
720 jlong as_long(LARGE_INTEGER x) {
721 jlong result = 0; // initialization to avoid warning
722 set_high(&result, x.HighPart);
723 set_low(&result, x.LowPart);
724 return result;
725 }
726
727
728 jlong os::elapsed_counter() {
729 LARGE_INTEGER count;
730 QueryPerformanceCounter(&count);
731 return as_long(count) - initial_performance_count;
732 }
733
734
735 jlong os::elapsed_frequency() {
736 return performance_frequency;
737 }
738
739
740 julong os::available_memory() {
741 return win32::available_memory();
742 }
743
744 julong os::win32::available_memory() {
745 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
746 // value if total memory is larger than 4GB
747 MEMORYSTATUSEX ms;
748 ms.dwLength = sizeof(ms);
749 GlobalMemoryStatusEx(&ms);
750
751 return (julong)ms.ullAvailPhys;
752 }
753
754 julong os::physical_memory() {
755 return win32::physical_memory();
756 }
757
758 bool os::has_allocatable_memory_limit(julong* limit) {
759 MEMORYSTATUSEX ms;
760 ms.dwLength = sizeof(ms);
761 GlobalMemoryStatusEx(&ms);
762 #ifdef _LP64
763 *limit = (julong)ms.ullAvailVirtual;
764 return true;
765 #else
766 // Limit to 1400m because of the 2gb address space wall
767 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
768 return true;
769 #endif
770 }
771
772 int os::active_processor_count() {
773 // User has overridden the number of active processors
774 if (ActiveProcessorCount > 0) {
775 log_trace(os)("active_processor_count: "
776 "active processor count set by user : %d",
777 ActiveProcessorCount);
778 return ActiveProcessorCount;
779 }
780
781 DWORD_PTR lpProcessAffinityMask = 0;
782 DWORD_PTR lpSystemAffinityMask = 0;
783 int proc_count = processor_count();
784 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
785 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
786 // Nof active processors is number of bits in process affinity mask
787 int bitcount = 0;
788 while (lpProcessAffinityMask != 0) {
789 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
790 bitcount++;
791 }
792 return bitcount;
793 } else {
794 return proc_count;
795 }
796 }
797
798 void os::set_native_thread_name(const char *name) {
799
800 // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
801 //
802 // Note that unfortunately this only works if the process
803 // is already attached to a debugger; debugger must observe
804 // the exception below to show the correct name.
805
806 // If there is no debugger attached skip raising the exception
807 if (!IsDebuggerPresent()) {
808 return;
809 }
810
811 const DWORD MS_VC_EXCEPTION = 0x406D1388;
812 struct {
813 DWORD dwType; // must be 0x1000
814 LPCSTR szName; // pointer to name (in user addr space)
815 DWORD dwThreadID; // thread ID (-1=caller thread)
816 DWORD dwFlags; // reserved for future use, must be zero
817 } info;
818
819 info.dwType = 0x1000;
820 info.szName = name;
821 info.dwThreadID = -1;
822 info.dwFlags = 0;
823
824 __try {
825 RaiseException (MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (const ULONG_PTR*)&info );
826 } __except(EXCEPTION_EXECUTE_HANDLER) {}
827 }
828
829 bool os::distribute_processes(uint length, uint* distribution) {
830 // Not yet implemented.
831 return false;
832 }
833
834 bool os::bind_to_processor(uint processor_id) {
835 // Not yet implemented.
836 return false;
837 }
838
839 void os::win32::initialize_performance_counter() {
840 LARGE_INTEGER count;
841 QueryPerformanceFrequency(&count);
842 performance_frequency = as_long(count);
843 QueryPerformanceCounter(&count);
844 initial_performance_count = as_long(count);
845 }
846
847
848 double os::elapsedTime() {
849 return (double) elapsed_counter() / (double) elapsed_frequency();
850 }
851
852
853 // Windows format:
854 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
855 // Java format:
856 // Java standards require the number of milliseconds since 1/1/1970
857
858 // Constant offset - calculated using offset()
859 static jlong _offset = 116444736000000000;
860 // Fake time counter for reproducible results when debugging
861 static jlong fake_time = 0;
862
863 #ifdef ASSERT
864 // Just to be safe, recalculate the offset in debug mode
865 static jlong _calculated_offset = 0;
866 static int _has_calculated_offset = 0;
867
868 jlong offset() {
869 if (_has_calculated_offset) return _calculated_offset;
870 SYSTEMTIME java_origin;
871 java_origin.wYear = 1970;
872 java_origin.wMonth = 1;
873 java_origin.wDayOfWeek = 0; // ignored
874 java_origin.wDay = 1;
875 java_origin.wHour = 0;
876 java_origin.wMinute = 0;
877 java_origin.wSecond = 0;
878 java_origin.wMilliseconds = 0;
879 FILETIME jot;
880 if (!SystemTimeToFileTime(&java_origin, &jot)) {
881 fatal("Error = %d\nWindows error", GetLastError());
882 }
883 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
884 _has_calculated_offset = 1;
885 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
886 return _calculated_offset;
887 }
888 #else
889 jlong offset() {
890 return _offset;
891 }
892 #endif
893
894 jlong windows_to_java_time(FILETIME wt) {
895 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
896 return (a - offset()) / 10000;
897 }
898
899 // Returns time ticks in (10th of micro seconds)
900 jlong windows_to_time_ticks(FILETIME wt) {
901 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
902 return (a - offset());
903 }
904
905 FILETIME java_to_windows_time(jlong l) {
906 jlong a = (l * 10000) + offset();
907 FILETIME result;
908 result.dwHighDateTime = high(a);
909 result.dwLowDateTime = low(a);
910 return result;
911 }
912
913 bool os::supports_vtime() { return true; }
914 bool os::enable_vtime() { return false; }
915 bool os::vtime_enabled() { return false; }
916
917 double os::elapsedVTime() {
918 FILETIME created;
919 FILETIME exited;
920 FILETIME kernel;
921 FILETIME user;
922 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
923 // the resolution of windows_to_java_time() should be sufficient (ms)
924 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
925 } else {
926 return elapsedTime();
927 }
928 }
929
930 jlong os::javaTimeMillis() {
931 FILETIME wt;
932 GetSystemTimeAsFileTime(&wt);
933 return windows_to_java_time(wt);
934 }
935
936 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
937 FILETIME wt;
938 GetSystemTimeAsFileTime(&wt);
939 jlong ticks = windows_to_time_ticks(wt); // 10th of micros
940 jlong secs = jlong(ticks / 10000000); // 10000 * 1000
941 seconds = secs;
942 nanos = jlong(ticks - (secs*10000000)) * 100;
943 }
944
945 jlong os::javaTimeNanos() {
946 LARGE_INTEGER current_count;
947 QueryPerformanceCounter(¤t_count);
948 double current = as_long(current_count);
949 double freq = performance_frequency;
950 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
951 return time;
952 }
953
954 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
955 jlong freq = performance_frequency;
956 if (freq < NANOSECS_PER_SEC) {
957 // the performance counter is 64 bits and we will
958 // be multiplying it -- so no wrap in 64 bits
959 info_ptr->max_value = ALL_64_BITS;
960 } else if (freq > NANOSECS_PER_SEC) {
961 // use the max value the counter can reach to
962 // determine the max value which could be returned
963 julong max_counter = (julong)ALL_64_BITS;
964 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
965 } else {
966 // the performance counter is 64 bits and we will
967 // be using it directly -- so no wrap in 64 bits
968 info_ptr->max_value = ALL_64_BITS;
969 }
970
971 // using a counter, so no skipping
972 info_ptr->may_skip_backward = false;
973 info_ptr->may_skip_forward = false;
974
975 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
976 }
977
978 char* os::local_time_string(char *buf, size_t buflen) {
979 SYSTEMTIME st;
980 GetLocalTime(&st);
981 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
982 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
983 return buf;
984 }
985
986 bool os::getTimesSecs(double* process_real_time,
987 double* process_user_time,
988 double* process_system_time) {
989 HANDLE h_process = GetCurrentProcess();
990 FILETIME create_time, exit_time, kernel_time, user_time;
991 BOOL result = GetProcessTimes(h_process,
992 &create_time,
993 &exit_time,
994 &kernel_time,
995 &user_time);
996 if (result != 0) {
997 FILETIME wt;
998 GetSystemTimeAsFileTime(&wt);
999 jlong rtc_millis = windows_to_java_time(wt);
1000 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
1001 *process_user_time =
1002 (double) jlong_from(user_time.dwHighDateTime, user_time.dwLowDateTime) / (10 * MICROUNITS);
1003 *process_system_time =
1004 (double) jlong_from(kernel_time.dwHighDateTime, kernel_time.dwLowDateTime) / (10 * MICROUNITS);
1005 return true;
1006 } else {
1007 return false;
1008 }
1009 }
1010
1011 void os::shutdown() {
1012 // allow PerfMemory to attempt cleanup of any persistent resources
1013 perfMemory_exit();
1014
1015 // flush buffered output, finish log files
1016 ostream_abort();
1017
1018 // Check for abort hook
1019 abort_hook_t abort_hook = Arguments::abort_hook();
1020 if (abort_hook != NULL) {
1021 abort_hook();
1022 }
1023 }
1024
1025
1026 static HANDLE dumpFile = NULL;
1027
1028 // Check if dump file can be created.
1029 void os::check_dump_limit(char* buffer, size_t buffsz) {
1030 bool status = true;
1031 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && !CreateCoredumpOnCrash) {
1032 jio_snprintf(buffer, buffsz, "CreateCoredumpOnCrash is disabled from command line");
1033 status = false;
1034 }
1035
1036 #ifndef ASSERT
1037 if (!os::win32::is_windows_server() && FLAG_IS_DEFAULT(CreateCoredumpOnCrash)) {
1038 jio_snprintf(buffer, buffsz, "Minidumps are not enabled by default on client versions of Windows");
1039 status = false;
1040 }
1041 #endif
1042
1043 if (status) {
1044 const char* cwd = get_current_directory(NULL, 0);
1045 int pid = current_process_id();
1046 if (cwd != NULL) {
1047 jio_snprintf(buffer, buffsz, "%s\\hs_err_pid%u.mdmp", cwd, pid);
1048 } else {
1049 jio_snprintf(buffer, buffsz, ".\\hs_err_pid%u.mdmp", pid);
1050 }
1051
1052 if (dumpFile == NULL &&
1053 (dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
1054 == INVALID_HANDLE_VALUE) {
1055 jio_snprintf(buffer, buffsz, "Failed to create minidump file (0x%x).", GetLastError());
1056 status = false;
1057 }
1058 }
1059 VMError::record_coredump_status(buffer, status);
1060 }
1061
1062 void os::abort(bool dump_core, void* siginfo, const void* context) {
1063 EXCEPTION_POINTERS ep;
1064 MINIDUMP_EXCEPTION_INFORMATION mei;
1065 MINIDUMP_EXCEPTION_INFORMATION* pmei;
1066
1067 HANDLE hProcess = GetCurrentProcess();
1068 DWORD processId = GetCurrentProcessId();
1069 MINIDUMP_TYPE dumpType;
1070
1071 shutdown();
1072 if (!dump_core || dumpFile == NULL) {
1073 if (dumpFile != NULL) {
1074 CloseHandle(dumpFile);
1075 }
1076 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1077 }
1078
1079 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData |
1080 MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo | MiniDumpWithUnloadedModules);
1081
1082 if (siginfo != NULL && context != NULL) {
1083 ep.ContextRecord = (PCONTEXT) context;
1084 ep.ExceptionRecord = (PEXCEPTION_RECORD) siginfo;
1085
1086 mei.ThreadId = GetCurrentThreadId();
1087 mei.ExceptionPointers = &ep;
1088 pmei = &mei;
1089 } else {
1090 pmei = NULL;
1091 }
1092
1093 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1094 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1095 if (!WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) &&
1096 !WindowsDbgHelp::miniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL)) {
1097 jio_fprintf(stderr, "Call to MiniDumpWriteDump() failed (Error 0x%x)\n", GetLastError());
1098 }
1099 CloseHandle(dumpFile);
1100 win32::exit_process_or_thread(win32::EPT_PROCESS, 1);
1101 }
1102
1103 // Die immediately, no exit hook, no abort hook, no cleanup.
1104 void os::die() {
1105 win32::exit_process_or_thread(win32::EPT_PROCESS_DIE, -1);
1106 }
1107
1108 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1109 // * dirent_md.c 1.15 00/02/02
1110 //
1111 // The declarations for DIR and struct dirent are in jvm_win32.h.
1112
1113 // Caller must have already run dirname through JVM_NativePath, which removes
1114 // duplicate slashes and converts all instances of '/' into '\\'.
1115
1116 DIR * os::opendir(const char *dirname) {
1117 assert(dirname != NULL, "just checking"); // hotspot change
1118 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1119 DWORD fattr; // hotspot change
1120 char alt_dirname[4] = { 0, 0, 0, 0 };
1121
1122 if (dirp == 0) {
1123 errno = ENOMEM;
1124 return 0;
1125 }
1126
1127 // Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1128 // as a directory in FindFirstFile(). We detect this case here and
1129 // prepend the current drive name.
1130 //
1131 if (dirname[1] == '\0' && dirname[0] == '\\') {
1132 alt_dirname[0] = _getdrive() + 'A' - 1;
1133 alt_dirname[1] = ':';
1134 alt_dirname[2] = '\\';
1135 alt_dirname[3] = '\0';
1136 dirname = alt_dirname;
1137 }
1138
1139 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1140 if (dirp->path == 0) {
1141 free(dirp);
1142 errno = ENOMEM;
1143 return 0;
1144 }
1145 strcpy(dirp->path, dirname);
1146
1147 fattr = GetFileAttributes(dirp->path);
1148 if (fattr == 0xffffffff) {
1149 free(dirp->path);
1150 free(dirp);
1151 errno = ENOENT;
1152 return 0;
1153 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1154 free(dirp->path);
1155 free(dirp);
1156 errno = ENOTDIR;
1157 return 0;
1158 }
1159
1160 // Append "*.*", or possibly "\\*.*", to path
1161 if (dirp->path[1] == ':' &&
1162 (dirp->path[2] == '\0' ||
1163 (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1164 // No '\\' needed for cases like "Z:" or "Z:\"
1165 strcat(dirp->path, "*.*");
1166 } else {
1167 strcat(dirp->path, "\\*.*");
1168 }
1169
1170 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1171 if (dirp->handle == INVALID_HANDLE_VALUE) {
1172 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1173 free(dirp->path);
1174 free(dirp);
1175 errno = EACCES;
1176 return 0;
1177 }
1178 }
1179 return dirp;
1180 }
1181
1182 struct dirent * os::readdir(DIR *dirp) {
1183 assert(dirp != NULL, "just checking"); // hotspot change
1184 if (dirp->handle == INVALID_HANDLE_VALUE) {
1185 return NULL;
1186 }
1187
1188 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1189
1190 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1191 if (GetLastError() == ERROR_INVALID_HANDLE) {
1192 errno = EBADF;
1193 return NULL;
1194 }
1195 FindClose(dirp->handle);
1196 dirp->handle = INVALID_HANDLE_VALUE;
1197 }
1198
1199 return &dirp->dirent;
1200 }
1201
1202 int os::closedir(DIR *dirp) {
1203 assert(dirp != NULL, "just checking"); // hotspot change
1204 if (dirp->handle != INVALID_HANDLE_VALUE) {
1205 if (!FindClose(dirp->handle)) {
1206 errno = EBADF;
1207 return -1;
1208 }
1209 dirp->handle = INVALID_HANDLE_VALUE;
1210 }
1211 free(dirp->path);
1212 free(dirp);
1213 return 0;
1214 }
1215
1216 // This must be hard coded because it's the system's temporary
1217 // directory not the java application's temp directory, ala java.io.tmpdir.
1218 const char* os::get_temp_directory() {
1219 static char path_buf[MAX_PATH];
1220 if (GetTempPath(MAX_PATH, path_buf) > 0) {
1221 return path_buf;
1222 } else {
1223 path_buf[0] = '\0';
1224 return path_buf;
1225 }
1226 }
1227
1228 // Needs to be in os specific directory because windows requires another
1229 // header file <direct.h>
1230 const char* os::get_current_directory(char *buf, size_t buflen) {
1231 int n = static_cast<int>(buflen);
1232 if (buflen > INT_MAX) n = INT_MAX;
1233 return _getcwd(buf, n);
1234 }
1235
1236 //-----------------------------------------------------------
1237 // Helper functions for fatal error handler
1238 #ifdef _WIN64
1239 // Helper routine which returns true if address in
1240 // within the NTDLL address space.
1241 //
1242 static bool _addr_in_ntdll(address addr) {
1243 HMODULE hmod;
1244 MODULEINFO minfo;
1245
1246 hmod = GetModuleHandle("NTDLL.DLL");
1247 if (hmod == NULL) return false;
1248 if (!GetModuleInformation(GetCurrentProcess(), hmod,
1249 &minfo, sizeof(MODULEINFO))) {
1250 return false;
1251 }
1252
1253 if ((addr >= minfo.lpBaseOfDll) &&
1254 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage))) {
1255 return true;
1256 } else {
1257 return false;
1258 }
1259 }
1260 #endif
1261
1262 struct _modinfo {
1263 address addr;
1264 char* full_path; // point to a char buffer
1265 int buflen; // size of the buffer
1266 address base_addr;
1267 };
1268
1269 static int _locate_module_by_addr(const char * mod_fname, address base_addr,
1270 address top_address, void * param) {
1271 struct _modinfo *pmod = (struct _modinfo *)param;
1272 if (!pmod) return -1;
1273
1274 if (base_addr <= pmod->addr &&
1275 top_address > pmod->addr) {
1276 // if a buffer is provided, copy path name to the buffer
1277 if (pmod->full_path) {
1278 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1279 }
1280 pmod->base_addr = base_addr;
1281 return 1;
1282 }
1283 return 0;
1284 }
1285
1286 bool os::dll_address_to_library_name(address addr, char* buf,
1287 int buflen, int* offset) {
1288 // buf is not optional, but offset is optional
1289 assert(buf != NULL, "sanity check");
1290
1291 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1292 // return the full path to the DLL file, sometimes it returns path
1293 // to the corresponding PDB file (debug info); sometimes it only
1294 // returns partial path, which makes life painful.
1295
1296 struct _modinfo mi;
1297 mi.addr = addr;
1298 mi.full_path = buf;
1299 mi.buflen = buflen;
1300 if (get_loaded_modules_info(_locate_module_by_addr, (void *)&mi)) {
1301 // buf already contains path name
1302 if (offset) *offset = addr - mi.base_addr;
1303 return true;
1304 }
1305
1306 buf[0] = '\0';
1307 if (offset) *offset = -1;
1308 return false;
1309 }
1310
1311 bool os::dll_address_to_function_name(address addr, char *buf,
1312 int buflen, int *offset,
1313 bool demangle) {
1314 // buf is not optional, but offset is optional
1315 assert(buf != NULL, "sanity check");
1316
1317 if (Decoder::decode(addr, buf, buflen, offset, demangle)) {
1318 return true;
1319 }
1320 if (offset != NULL) *offset = -1;
1321 buf[0] = '\0';
1322 return false;
1323 }
1324
1325 // save the start and end address of jvm.dll into param[0] and param[1]
1326 static int _locate_jvm_dll(const char* mod_fname, address base_addr,
1327 address top_address, void * param) {
1328 if (!param) return -1;
1329
1330 if (base_addr <= (address)_locate_jvm_dll &&
1331 top_address > (address)_locate_jvm_dll) {
1332 ((address*)param)[0] = base_addr;
1333 ((address*)param)[1] = top_address;
1334 return 1;
1335 }
1336 return 0;
1337 }
1338
1339 address vm_lib_location[2]; // start and end address of jvm.dll
1340
1341 // check if addr is inside jvm.dll
1342 bool os::address_is_in_vm(address addr) {
1343 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1344 if (!get_loaded_modules_info(_locate_jvm_dll, (void *)vm_lib_location)) {
1345 assert(false, "Can't find jvm module.");
1346 return false;
1347 }
1348 }
1349
1350 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1351 }
1352
1353 // print module info; param is outputStream*
1354 static int _print_module(const char* fname, address base_address,
1355 address top_address, void* param) {
1356 if (!param) return -1;
1357
1358 outputStream* st = (outputStream*)param;
1359
1360 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base_address, top_address, fname);
1361 return 0;
1362 }
1363
1364 // Loads .dll/.so and
1365 // in case of error it checks if .dll/.so was built for the
1366 // same architecture as Hotspot is running on
1367 void * os::dll_load(const char *name, char *ebuf, int ebuflen) {
1368 void * result = LoadLibrary(name);
1369 if (result != NULL) {
1370 // Recalculate pdb search path if a DLL was loaded successfully.
1371 SymbolEngine::recalc_search_path();
1372 return result;
1373 }
1374
1375 DWORD errcode = GetLastError();
1376 if (errcode == ERROR_MOD_NOT_FOUND) {
1377 strncpy(ebuf, "Can't find dependent libraries", ebuflen - 1);
1378 ebuf[ebuflen - 1] = '\0';
1379 return NULL;
1380 }
1381
1382 // Parsing dll below
1383 // If we can read dll-info and find that dll was built
1384 // for an architecture other than Hotspot is running in
1385 // - then print to buffer "DLL was built for a different architecture"
1386 // else call os::lasterror to obtain system error message
1387
1388 // Read system error message into ebuf
1389 // It may or may not be overwritten below (in the for loop and just above)
1390 lasterror(ebuf, (size_t) ebuflen);
1391 ebuf[ebuflen - 1] = '\0';
1392 int fd = ::open(name, O_RDONLY | O_BINARY, 0);
1393 if (fd < 0) {
1394 return NULL;
1395 }
1396
1397 uint32_t signature_offset;
1398 uint16_t lib_arch = 0;
1399 bool failed_to_get_lib_arch =
1400 ( // Go to position 3c in the dll
1401 (os::seek_to_file_offset(fd, IMAGE_FILE_PTR_TO_SIGNATURE) < 0)
1402 ||
1403 // Read location of signature
1404 (sizeof(signature_offset) !=
1405 (os::read(fd, (void*)&signature_offset, sizeof(signature_offset))))
1406 ||
1407 // Go to COFF File Header in dll
1408 // that is located after "signature" (4 bytes long)
1409 (os::seek_to_file_offset(fd,
1410 signature_offset + IMAGE_FILE_SIGNATURE_LENGTH) < 0)
1411 ||
1412 // Read field that contains code of architecture
1413 // that dll was built for
1414 (sizeof(lib_arch) != (os::read(fd, (void*)&lib_arch, sizeof(lib_arch))))
1415 );
1416
1417 ::close(fd);
1418 if (failed_to_get_lib_arch) {
1419 // file i/o error - report os::lasterror(...) msg
1420 return NULL;
1421 }
1422
1423 typedef struct {
1424 uint16_t arch_code;
1425 char* arch_name;
1426 } arch_t;
1427
1428 static const arch_t arch_array[] = {
1429 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1430 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"}
1431 };
1432 #if (defined _M_AMD64)
1433 static const uint16_t running_arch = IMAGE_FILE_MACHINE_AMD64;
1434 #elif (defined _M_IX86)
1435 static const uint16_t running_arch = IMAGE_FILE_MACHINE_I386;
1436 #else
1437 #error Method os::dll_load requires that one of following \
1438 is defined :_M_AMD64 or _M_IX86
1439 #endif
1440
1441
1442 // Obtain a string for printf operation
1443 // lib_arch_str shall contain string what platform this .dll was built for
1444 // running_arch_str shall string contain what platform Hotspot was built for
1445 char *running_arch_str = NULL, *lib_arch_str = NULL;
1446 for (unsigned int i = 0; i < ARRAY_SIZE(arch_array); i++) {
1447 if (lib_arch == arch_array[i].arch_code) {
1448 lib_arch_str = arch_array[i].arch_name;
1449 }
1450 if (running_arch == arch_array[i].arch_code) {
1451 running_arch_str = arch_array[i].arch_name;
1452 }
1453 }
1454
1455 assert(running_arch_str,
1456 "Didn't find running architecture code in arch_array");
1457
1458 // If the architecture is right
1459 // but some other error took place - report os::lasterror(...) msg
1460 if (lib_arch == running_arch) {
1461 return NULL;
1462 }
1463
1464 if (lib_arch_str != NULL) {
1465 ::_snprintf(ebuf, ebuflen - 1,
1466 "Can't load %s-bit .dll on a %s-bit platform",
1467 lib_arch_str, running_arch_str);
1468 } else {
1469 // don't know what architecture this dll was build for
1470 ::_snprintf(ebuf, ebuflen - 1,
1471 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1472 lib_arch, running_arch_str);
1473 }
1474
1475 return NULL;
1476 }
1477
1478 void os::print_dll_info(outputStream *st) {
1479 st->print_cr("Dynamic libraries:");
1480 get_loaded_modules_info(_print_module, (void *)st);
1481 }
1482
1483 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1484 HANDLE hProcess;
1485
1486 # define MAX_NUM_MODULES 128
1487 HMODULE modules[MAX_NUM_MODULES];
1488 static char filename[MAX_PATH];
1489 int result = 0;
1490
1491 int pid = os::current_process_id();
1492 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1493 FALSE, pid);
1494 if (hProcess == NULL) return 0;
1495
1496 DWORD size_needed;
1497 if (!EnumProcessModules(hProcess, modules, sizeof(modules), &size_needed)) {
1498 CloseHandle(hProcess);
1499 return 0;
1500 }
1501
1502 // number of modules that are currently loaded
1503 int num_modules = size_needed / sizeof(HMODULE);
1504
1505 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1506 // Get Full pathname:
1507 if (!GetModuleFileNameEx(hProcess, modules[i], filename, sizeof(filename))) {
1508 filename[0] = '\0';
1509 }
1510
1511 MODULEINFO modinfo;
1512 if (!GetModuleInformation(hProcess, modules[i], &modinfo, sizeof(modinfo))) {
1513 modinfo.lpBaseOfDll = NULL;
1514 modinfo.SizeOfImage = 0;
1515 }
1516
1517 // Invoke callback function
1518 result = callback(filename, (address)modinfo.lpBaseOfDll,
1519 (address)((u8)modinfo.lpBaseOfDll + (u8)modinfo.SizeOfImage), param);
1520 if (result) break;
1521 }
1522
1523 CloseHandle(hProcess);
1524 return result;
1525 }
1526
1527 bool os::get_host_name(char* buf, size_t buflen) {
1528 DWORD size = (DWORD)buflen;
1529 return (GetComputerNameEx(ComputerNameDnsHostname, buf, &size) == TRUE);
1530 }
1531
1532 void os::get_summary_os_info(char* buf, size_t buflen) {
1533 stringStream sst(buf, buflen);
1534 os::win32::print_windows_version(&sst);
1535 // chop off newline character
1536 char* nl = strchr(buf, '\n');
1537 if (nl != NULL) *nl = '\0';
1538 }
1539
1540 int os::vsnprintf(char* buf, size_t len, const char* fmt, va_list args) {
1541 #if _MSC_VER >= 1900
1542 // Starting with Visual Studio 2015, vsnprint is C99 compliant.
1543 int result = ::vsnprintf(buf, len, fmt, args);
1544 // If an encoding error occurred (result < 0) then it's not clear
1545 // whether the buffer is NUL terminated, so ensure it is.
1546 if ((result < 0) && (len > 0)) {
1547 buf[len - 1] = '\0';
1548 }
1549 return result;
1550 #else
1551 // Before Visual Studio 2015, vsnprintf is not C99 compliant, so use
1552 // _vsnprintf, whose behavior seems to be *mostly* consistent across
1553 // versions. However, when len == 0, avoid _vsnprintf too, and just
1554 // go straight to _vscprintf. The output is going to be truncated in
1555 // that case, except in the unusual case of empty output. More
1556 // importantly, the documentation for various versions of Visual Studio
1557 // are inconsistent about the behavior of _vsnprintf when len == 0,
1558 // including it possibly being an error.
1559 int result = -1;
1560 if (len > 0) {
1561 result = _vsnprintf(buf, len, fmt, args);
1562 // If output (including NUL terminator) is truncated, the buffer
1563 // won't be NUL terminated. Add the trailing NUL specified by C99.
1564 if ((result < 0) || ((size_t)result >= len)) {
1565 buf[len - 1] = '\0';
1566 }
1567 }
1568 if (result < 0) {
1569 result = _vscprintf(fmt, args);
1570 }
1571 return result;
1572 #endif // _MSC_VER dispatch
1573 }
1574
1575 static inline time_t get_mtime(const char* filename) {
1576 struct stat st;
1577 int ret = os::stat(filename, &st);
1578 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1579 return st.st_mtime;
1580 }
1581
1582 int os::compare_file_modified_times(const char* file1, const char* file2) {
1583 time_t t1 = get_mtime(file1);
1584 time_t t2 = get_mtime(file2);
1585 return t1 - t2;
1586 }
1587
1588 void os::print_os_info_brief(outputStream* st) {
1589 os::print_os_info(st);
1590 }
1591
1592 void os::print_os_info(outputStream* st) {
1593 #ifdef ASSERT
1594 char buffer[1024];
1595 st->print("HostName: ");
1596 if (get_host_name(buffer, sizeof(buffer))) {
1597 st->print("%s ", buffer);
1598 } else {
1599 st->print("N/A ");
1600 }
1601 #endif
1602 st->print("OS:");
1603 os::win32::print_windows_version(st);
1604
1605 #ifdef _LP64
1606 VM_Version::print_platform_virtualization_info(st);
1607 #endif
1608 }
1609
1610 void os::win32::print_windows_version(outputStream* st) {
1611 OSVERSIONINFOEX osvi;
1612 VS_FIXEDFILEINFO *file_info;
1613 TCHAR kernel32_path[MAX_PATH];
1614 UINT len, ret;
1615
1616 // Use the GetVersionEx information to see if we're on a server or
1617 // workstation edition of Windows. Starting with Windows 8.1 we can't
1618 // trust the OS version information returned by this API.
1619 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1620 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1621 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1622 st->print_cr("Call to GetVersionEx failed");
1623 return;
1624 }
1625 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1626
1627 // Get the full path to \Windows\System32\kernel32.dll and use that for
1628 // determining what version of Windows we're running on.
1629 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1630 ret = GetSystemDirectory(kernel32_path, len);
1631 if (ret == 0 || ret > len) {
1632 st->print_cr("Call to GetSystemDirectory failed");
1633 return;
1634 }
1635 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1636
1637 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1638 if (version_size == 0) {
1639 st->print_cr("Call to GetFileVersionInfoSize failed");
1640 return;
1641 }
1642
1643 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1644 if (version_info == NULL) {
1645 st->print_cr("Failed to allocate version_info");
1646 return;
1647 }
1648
1649 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1650 os::free(version_info);
1651 st->print_cr("Call to GetFileVersionInfo failed");
1652 return;
1653 }
1654
1655 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1656 os::free(version_info);
1657 st->print_cr("Call to VerQueryValue failed");
1658 return;
1659 }
1660
1661 int major_version = HIWORD(file_info->dwProductVersionMS);
1662 int minor_version = LOWORD(file_info->dwProductVersionMS);
1663 int build_number = HIWORD(file_info->dwProductVersionLS);
1664 int build_minor = LOWORD(file_info->dwProductVersionLS);
1665 int os_vers = major_version * 1000 + minor_version;
1666 os::free(version_info);
1667
1668 st->print(" Windows ");
1669 switch (os_vers) {
1670
1671 case 6000:
1672 if (is_workstation) {
1673 st->print("Vista");
1674 } else {
1675 st->print("Server 2008");
1676 }
1677 break;
1678
1679 case 6001:
1680 if (is_workstation) {
1681 st->print("7");
1682 } else {
1683 st->print("Server 2008 R2");
1684 }
1685 break;
1686
1687 case 6002:
1688 if (is_workstation) {
1689 st->print("8");
1690 } else {
1691 st->print("Server 2012");
1692 }
1693 break;
1694
1695 case 6003:
1696 if (is_workstation) {
1697 st->print("8.1");
1698 } else {
1699 st->print("Server 2012 R2");
1700 }
1701 break;
1702
1703 case 10000:
1704 if (is_workstation) {
1705 st->print("10");
1706 } else {
1707 // distinguish Windows Server 2016 and 2019 by build number
1708 // Windows server 2019 GA 10/2018 build number is 17763
1709 if (build_number > 17762) {
1710 st->print("Server 2019");
1711 } else {
1712 st->print("Server 2016");
1713 }
1714 }
1715 break;
1716
1717 default:
1718 // Unrecognized windows, print out its major and minor versions
1719 st->print("%d.%d", major_version, minor_version);
1720 break;
1721 }
1722
1723 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1724 // find out whether we are running on 64 bit processor or not
1725 SYSTEM_INFO si;
1726 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1727 GetNativeSystemInfo(&si);
1728 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1729 st->print(" , 64 bit");
1730 }
1731
1732 st->print(" Build %d", build_number);
1733 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1734 st->cr();
1735 }
1736
1737 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1738 // Nothing to do for now.
1739 }
1740
1741 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1742 HKEY key;
1743 DWORD status = RegOpenKey(HKEY_LOCAL_MACHINE,
1744 "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0", &key);
1745 if (status == ERROR_SUCCESS) {
1746 DWORD size = (DWORD)buflen;
1747 status = RegQueryValueEx(key, "ProcessorNameString", NULL, NULL, (byte*)buf, &size);
1748 if (status != ERROR_SUCCESS) {
1749 strncpy(buf, "## __CPU__", buflen);
1750 }
1751 RegCloseKey(key);
1752 } else {
1753 // Put generic cpu info to return
1754 strncpy(buf, "## __CPU__", buflen);
1755 }
1756 }
1757
1758 void os::print_memory_info(outputStream* st) {
1759 st->print("Memory:");
1760 st->print(" %dk page", os::vm_page_size()>>10);
1761
1762 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1763 // value if total memory is larger than 4GB
1764 MEMORYSTATUSEX ms;
1765 ms.dwLength = sizeof(ms);
1766 int r1 = GlobalMemoryStatusEx(&ms);
1767
1768 if (r1 != 0) {
1769 st->print(", system-wide physical " INT64_FORMAT "M ",
1770 (int64_t) ms.ullTotalPhys >> 20);
1771 st->print("(" INT64_FORMAT "M free)\n", (int64_t) ms.ullAvailPhys >> 20);
1772
1773 st->print("TotalPageFile size " INT64_FORMAT "M ",
1774 (int64_t) ms.ullTotalPageFile >> 20);
1775 st->print("(AvailPageFile size " INT64_FORMAT "M)",
1776 (int64_t) ms.ullAvailPageFile >> 20);
1777
1778 // on 32bit Total/AvailVirtual are interesting (show us how close we get to 2-4 GB per process borders)
1779 #if defined(_M_IX86)
1780 st->print(", user-mode portion of virtual address-space " INT64_FORMAT "M ",
1781 (int64_t) ms.ullTotalVirtual >> 20);
1782 st->print("(" INT64_FORMAT "M free)", (int64_t) ms.ullAvailVirtual >> 20);
1783 #endif
1784 } else {
1785 st->print(", GlobalMemoryStatusEx did not succeed so we miss some memory values.");
1786 }
1787
1788 // extended memory statistics for a process
1789 PROCESS_MEMORY_COUNTERS_EX pmex;
1790 ZeroMemory(&pmex, sizeof(PROCESS_MEMORY_COUNTERS_EX));
1791 pmex.cb = sizeof(pmex);
1792 int r2 = GetProcessMemoryInfo(GetCurrentProcess(), (PROCESS_MEMORY_COUNTERS*) &pmex, sizeof(pmex));
1793
1794 if (r2 != 0) {
1795 st->print("\ncurrent process WorkingSet (physical memory assigned to process): " INT64_FORMAT "M, ",
1796 (int64_t) pmex.WorkingSetSize >> 20);
1797 st->print("peak: " INT64_FORMAT "M\n", (int64_t) pmex.PeakWorkingSetSize >> 20);
1798
1799 st->print("current process commit charge (\"private bytes\"): " INT64_FORMAT "M, ",
1800 (int64_t) pmex.PrivateUsage >> 20);
1801 st->print("peak: " INT64_FORMAT "M", (int64_t) pmex.PeakPagefileUsage >> 20);
1802 } else {
1803 st->print("\nGetProcessMemoryInfo did not succeed so we miss some memory values.");
1804 }
1805
1806 st->cr();
1807 }
1808
1809 bool os::signal_sent_by_kill(const void* siginfo) {
1810 // TODO: Is this possible?
1811 return false;
1812 }
1813
1814 void os::print_siginfo(outputStream *st, const void* siginfo) {
1815 const EXCEPTION_RECORD* const er = (EXCEPTION_RECORD*)siginfo;
1816 st->print("siginfo:");
1817
1818 char tmp[64];
1819 if (os::exception_name(er->ExceptionCode, tmp, sizeof(tmp)) == NULL) {
1820 strcpy(tmp, "EXCEPTION_??");
1821 }
1822 st->print(" %s (0x%x)", tmp, er->ExceptionCode);
1823
1824 if ((er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
1825 er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR) &&
1826 er->NumberParameters >= 2) {
1827 switch (er->ExceptionInformation[0]) {
1828 case 0: st->print(", reading address"); break;
1829 case 1: st->print(", writing address"); break;
1830 case 8: st->print(", data execution prevention violation at address"); break;
1831 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1832 er->ExceptionInformation[0]);
1833 }
1834 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1835 } else {
1836 int num = er->NumberParameters;
1837 if (num > 0) {
1838 st->print(", ExceptionInformation=");
1839 for (int i = 0; i < num; i++) {
1840 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1841 }
1842 }
1843 }
1844 st->cr();
1845 }
1846
1847 bool os::signal_thread(Thread* thread, int sig, const char* reason) {
1848 // TODO: Can we kill thread?
1849 return false;
1850 }
1851
1852 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1853 // do nothing
1854 }
1855
1856 static char saved_jvm_path[MAX_PATH] = {0};
1857
1858 // Find the full path to the current module, jvm.dll
1859 void os::jvm_path(char *buf, jint buflen) {
1860 // Error checking.
1861 if (buflen < MAX_PATH) {
1862 assert(false, "must use a large-enough buffer");
1863 buf[0] = '\0';
1864 return;
1865 }
1866 // Lazy resolve the path to current module.
1867 if (saved_jvm_path[0] != 0) {
1868 strcpy(buf, saved_jvm_path);
1869 return;
1870 }
1871
1872 buf[0] = '\0';
1873 if (Arguments::sun_java_launcher_is_altjvm()) {
1874 // Support for the java launcher's '-XXaltjvm=<path>' option. Check
1875 // for a JAVA_HOME environment variable and fix up the path so it
1876 // looks like jvm.dll is installed there (append a fake suffix
1877 // hotspot/jvm.dll).
1878 char* java_home_var = ::getenv("JAVA_HOME");
1879 if (java_home_var != NULL && java_home_var[0] != 0 &&
1880 strlen(java_home_var) < (size_t)buflen) {
1881 strncpy(buf, java_home_var, buflen);
1882
1883 // determine if this is a legacy image or modules image
1884 // modules image doesn't have "jre" subdirectory
1885 size_t len = strlen(buf);
1886 char* jrebin_p = buf + len;
1887 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1888 if (0 != _access(buf, 0)) {
1889 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1890 }
1891 len = strlen(buf);
1892 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1893 }
1894 }
1895
1896 if (buf[0] == '\0') {
1897 GetModuleFileName(vm_lib_handle, buf, buflen);
1898 }
1899 strncpy(saved_jvm_path, buf, MAX_PATH);
1900 saved_jvm_path[MAX_PATH - 1] = '\0';
1901 }
1902
1903
1904 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1905 #ifndef _WIN64
1906 st->print("_");
1907 #endif
1908 }
1909
1910
1911 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1912 #ifndef _WIN64
1913 st->print("@%d", args_size * sizeof(int));
1914 #endif
1915 }
1916
1917 // This method is a copy of JDK's sysGetLastErrorString
1918 // from src/windows/hpi/src/system_md.c
1919
1920 size_t os::lasterror(char* buf, size_t len) {
1921 DWORD errval;
1922
1923 if ((errval = GetLastError()) != 0) {
1924 // DOS error
1925 size_t n = (size_t)FormatMessage(
1926 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1927 NULL,
1928 errval,
1929 0,
1930 buf,
1931 (DWORD)len,
1932 NULL);
1933 if (n > 3) {
1934 // Drop final '.', CR, LF
1935 if (buf[n - 1] == '\n') n--;
1936 if (buf[n - 1] == '\r') n--;
1937 if (buf[n - 1] == '.') n--;
1938 buf[n] = '\0';
1939 }
1940 return n;
1941 }
1942
1943 if (errno != 0) {
1944 // C runtime error that has no corresponding DOS error code
1945 const char* s = os::strerror(errno);
1946 size_t n = strlen(s);
1947 if (n >= len) n = len - 1;
1948 strncpy(buf, s, n);
1949 buf[n] = '\0';
1950 return n;
1951 }
1952
1953 return 0;
1954 }
1955
1956 int os::get_last_error() {
1957 DWORD error = GetLastError();
1958 if (error == 0) {
1959 error = errno;
1960 }
1961 return (int)error;
1962 }
1963
1964 // sun.misc.Signal
1965 // NOTE that this is a workaround for an apparent kernel bug where if
1966 // a signal handler for SIGBREAK is installed then that signal handler
1967 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1968 // See bug 4416763.
1969 static void (*sigbreakHandler)(int) = NULL;
1970
1971 static void UserHandler(int sig, void *siginfo, void *context) {
1972 os::signal_notify(sig);
1973 // We need to reinstate the signal handler each time...
1974 os::signal(sig, (void*)UserHandler);
1975 }
1976
1977 void* os::user_handler() {
1978 return (void*) UserHandler;
1979 }
1980
1981 void* os::signal(int signal_number, void* handler) {
1982 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1983 void (*oldHandler)(int) = sigbreakHandler;
1984 sigbreakHandler = (void (*)(int)) handler;
1985 return (void*) oldHandler;
1986 } else {
1987 return (void*)::signal(signal_number, (void (*)(int))handler);
1988 }
1989 }
1990
1991 void os::signal_raise(int signal_number) {
1992 raise(signal_number);
1993 }
1994
1995 // The Win32 C runtime library maps all console control events other than ^C
1996 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1997 // logoff, and shutdown events. We therefore install our own console handler
1998 // that raises SIGTERM for the latter cases.
1999 //
2000 static BOOL WINAPI consoleHandler(DWORD event) {
2001 switch (event) {
2002 case CTRL_C_EVENT:
2003 if (VMError::is_error_reported()) {
2004 // Ctrl-C is pressed during error reporting, likely because the error
2005 // handler fails to abort. Let VM die immediately.
2006 os::die();
2007 }
2008
2009 os::signal_raise(SIGINT);
2010 return TRUE;
2011 break;
2012 case CTRL_BREAK_EVENT:
2013 if (sigbreakHandler != NULL) {
2014 (*sigbreakHandler)(SIGBREAK);
2015 }
2016 return TRUE;
2017 break;
2018 case CTRL_LOGOFF_EVENT: {
2019 // Don't terminate JVM if it is running in a non-interactive session,
2020 // such as a service process.
2021 USEROBJECTFLAGS flags;
2022 HANDLE handle = GetProcessWindowStation();
2023 if (handle != NULL &&
2024 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2025 sizeof(USEROBJECTFLAGS), NULL)) {
2026 // If it is a non-interactive session, let next handler to deal
2027 // with it.
2028 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2029 return FALSE;
2030 }
2031 }
2032 }
2033 case CTRL_CLOSE_EVENT:
2034 case CTRL_SHUTDOWN_EVENT:
2035 os::signal_raise(SIGTERM);
2036 return TRUE;
2037 break;
2038 default:
2039 break;
2040 }
2041 return FALSE;
2042 }
2043
2044 // The following code is moved from os.cpp for making this
2045 // code platform specific, which it is by its very nature.
2046
2047 // Return maximum OS signal used + 1 for internal use only
2048 // Used as exit signal for signal_thread
2049 int os::sigexitnum_pd() {
2050 return NSIG;
2051 }
2052
2053 // a counter for each possible signal value, including signal_thread exit signal
2054 static volatile jint pending_signals[NSIG+1] = { 0 };
2055 static Semaphore* sig_sem = NULL;
2056
2057 static void jdk_misc_signal_init() {
2058 // Initialize signal structures
2059 memset((void*)pending_signals, 0, sizeof(pending_signals));
2060
2061 // Initialize signal semaphore
2062 sig_sem = new Semaphore();
2063
2064 // Programs embedding the VM do not want it to attempt to receive
2065 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2066 // shutdown hooks mechanism introduced in 1.3. For example, when
2067 // the VM is run as part of a Windows NT service (i.e., a servlet
2068 // engine in a web server), the correct behavior is for any console
2069 // control handler to return FALSE, not TRUE, because the OS's
2070 // "final" handler for such events allows the process to continue if
2071 // it is a service (while terminating it if it is not a service).
2072 // To make this behavior uniform and the mechanism simpler, we
2073 // completely disable the VM's usage of these console events if -Xrs
2074 // (=ReduceSignalUsage) is specified. This means, for example, that
2075 // the CTRL-BREAK thread dump mechanism is also disabled in this
2076 // case. See bugs 4323062, 4345157, and related bugs.
2077
2078 // Add a CTRL-C handler
2079 SetConsoleCtrlHandler(consoleHandler, TRUE);
2080 }
2081
2082 void os::signal_notify(int sig) {
2083 if (sig_sem != NULL) {
2084 Atomic::inc(&pending_signals[sig]);
2085 sig_sem->signal();
2086 } else {
2087 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2088 // initialization isn't called.
2089 assert(ReduceSignalUsage, "signal semaphore should be created");
2090 }
2091 }
2092
2093 static int check_pending_signals() {
2094 while (true) {
2095 for (int i = 0; i < NSIG + 1; i++) {
2096 jint n = pending_signals[i];
2097 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2098 return i;
2099 }
2100 }
2101 JavaThread *thread = JavaThread::current();
2102
2103 ThreadBlockInVM tbivm(thread);
2104
2105 bool threadIsSuspended;
2106 do {
2107 thread->set_suspend_equivalent();
2108 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2109 sig_sem->wait();
2110
2111 // were we externally suspended while we were waiting?
2112 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2113 if (threadIsSuspended) {
2114 // The semaphore has been incremented, but while we were waiting
2115 // another thread suspended us. We don't want to continue running
2116 // while suspended because that would surprise the thread that
2117 // suspended us.
2118 sig_sem->signal();
2119
2120 thread->java_suspend_self();
2121 }
2122 } while (threadIsSuspended);
2123 }
2124 }
2125
2126 int os::signal_wait() {
2127 return check_pending_signals();
2128 }
2129
2130 // Implicit OS exception handling
2131
2132 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo,
2133 address handler) {
2134 JavaThread* thread = (JavaThread*) Thread::current_or_null();
2135 // Save pc in thread
2136 #ifdef _M_AMD64
2137 // Do not blow up if no thread info available.
2138 if (thread) {
2139 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2140 }
2141 // Set pc to handler
2142 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2143 #else
2144 // Do not blow up if no thread info available.
2145 if (thread) {
2146 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2147 }
2148 // Set pc to handler
2149 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2150 #endif
2151
2152 // Continue the execution
2153 return EXCEPTION_CONTINUE_EXECUTION;
2154 }
2155
2156
2157 // Used for PostMortemDump
2158 extern "C" void safepoints();
2159 extern "C" void find(int x);
2160 extern "C" void events();
2161
2162 // According to Windows API documentation, an illegal instruction sequence should generate
2163 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2164 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2165 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2166
2167 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2168
2169 // From "Execution Protection in the Windows Operating System" draft 0.35
2170 // Once a system header becomes available, the "real" define should be
2171 // included or copied here.
2172 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2173
2174 // Windows Vista/2008 heap corruption check
2175 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2176
2177 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2178 // C++ compiler contain this error code. Because this is a compiler-generated
2179 // error, the code is not listed in the Win32 API header files.
2180 // The code is actually a cryptic mnemonic device, with the initial "E"
2181 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2182 // ASCII values of "msc".
2183
2184 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2185
2186 #define def_excpt(val) { #val, (val) }
2187
2188 static const struct { char* name; uint number; } exceptlabels[] = {
2189 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2190 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2191 def_excpt(EXCEPTION_BREAKPOINT),
2192 def_excpt(EXCEPTION_SINGLE_STEP),
2193 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2194 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2195 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2196 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2197 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2198 def_excpt(EXCEPTION_FLT_OVERFLOW),
2199 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2200 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2201 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2202 def_excpt(EXCEPTION_INT_OVERFLOW),
2203 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2204 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2205 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2206 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2207 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2208 def_excpt(EXCEPTION_STACK_OVERFLOW),
2209 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2210 def_excpt(EXCEPTION_GUARD_PAGE),
2211 def_excpt(EXCEPTION_INVALID_HANDLE),
2212 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2213 def_excpt(EXCEPTION_HEAP_CORRUPTION)
2214 };
2215
2216 #undef def_excpt
2217
2218 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2219 uint code = static_cast<uint>(exception_code);
2220 for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
2221 if (exceptlabels[i].number == code) {
2222 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2223 return buf;
2224 }
2225 }
2226
2227 return NULL;
2228 }
2229
2230 //-----------------------------------------------------------------------------
2231 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2232 // handle exception caused by idiv; should only happen for -MinInt/-1
2233 // (division by zero is handled explicitly)
2234 #ifdef _M_AMD64
2235 PCONTEXT ctx = exceptionInfo->ContextRecord;
2236 address pc = (address)ctx->Rip;
2237 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && pc[1] == 0xF7 || pc[0] == 0xF7, "not an idiv opcode");
2238 assert(pc[0] >= Assembler::REX && pc[0] <= Assembler::REX_WRXB && (pc[2] & ~0x7) == 0xF8 || (pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2239 if (pc[0] == 0xF7) {
2240 // set correct result values and continue after idiv instruction
2241 ctx->Rip = (DWORD64)pc + 2; // idiv reg, reg is 2 bytes
2242 } else {
2243 ctx->Rip = (DWORD64)pc + 3; // REX idiv reg, reg is 3 bytes
2244 }
2245 // Do not set ctx->Rax as it already contains the correct value (either 32 or 64 bit, depending on the operation)
2246 // this is the case because the exception only happens for -MinValue/-1 and -MinValue is always in rax because of the
2247 // idiv opcode (0xF7).
2248 ctx->Rdx = (DWORD)0; // remainder
2249 // Continue the execution
2250 #else
2251 PCONTEXT ctx = exceptionInfo->ContextRecord;
2252 address pc = (address)ctx->Eip;
2253 assert(pc[0] == 0xF7, "not an idiv opcode");
2254 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2255 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2256 // set correct result values and continue after idiv instruction
2257 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2258 ctx->Eax = (DWORD)min_jint; // result
2259 ctx->Edx = (DWORD)0; // remainder
2260 // Continue the execution
2261 #endif
2262 return EXCEPTION_CONTINUE_EXECUTION;
2263 }
2264
2265 //-----------------------------------------------------------------------------
2266 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2267 PCONTEXT ctx = exceptionInfo->ContextRecord;
2268 #ifndef _WIN64
2269 // handle exception caused by native method modifying control word
2270 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2271
2272 switch (exception_code) {
2273 case EXCEPTION_FLT_DENORMAL_OPERAND:
2274 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2275 case EXCEPTION_FLT_INEXACT_RESULT:
2276 case EXCEPTION_FLT_INVALID_OPERATION:
2277 case EXCEPTION_FLT_OVERFLOW:
2278 case EXCEPTION_FLT_STACK_CHECK:
2279 case EXCEPTION_FLT_UNDERFLOW:
2280 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2281 if (fp_control_word != ctx->FloatSave.ControlWord) {
2282 // Restore FPCW and mask out FLT exceptions
2283 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2284 // Mask out pending FLT exceptions
2285 ctx->FloatSave.StatusWord &= 0xffffff00;
2286 return EXCEPTION_CONTINUE_EXECUTION;
2287 }
2288 }
2289
2290 if (prev_uef_handler != NULL) {
2291 // We didn't handle this exception so pass it to the previous
2292 // UnhandledExceptionFilter.
2293 return (prev_uef_handler)(exceptionInfo);
2294 }
2295 #else // !_WIN64
2296 // On Windows, the mxcsr control bits are non-volatile across calls
2297 // See also CR 6192333
2298 //
2299 jint MxCsr = INITIAL_MXCSR;
2300 // we can't use StubRoutines::addr_mxcsr_std()
2301 // because in Win64 mxcsr is not saved there
2302 if (MxCsr != ctx->MxCsr) {
2303 ctx->MxCsr = MxCsr;
2304 return EXCEPTION_CONTINUE_EXECUTION;
2305 }
2306 #endif // !_WIN64
2307
2308 return EXCEPTION_CONTINUE_SEARCH;
2309 }
2310
2311 static inline void report_error(Thread* t, DWORD exception_code,
2312 address addr, void* siginfo, void* context) {
2313 VMError::report_and_die(t, exception_code, addr, siginfo, context);
2314
2315 // If UseOsErrorReporting, this will return here and save the error file
2316 // somewhere where we can find it in the minidump.
2317 }
2318
2319 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
2320 struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
2321 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2322 address addr = (address) exceptionRecord->ExceptionInformation[1];
2323 if (Interpreter::contains(pc)) {
2324 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2325 if (!fr->is_first_java_frame()) {
2326 // get_frame_at_stack_banging_point() is only called when we
2327 // have well defined stacks so java_sender() calls do not need
2328 // to assert safe_for_sender() first.
2329 *fr = fr->java_sender();
2330 }
2331 } else {
2332 // more complex code with compiled code
2333 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
2334 CodeBlob* cb = CodeCache::find_blob(pc);
2335 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
2336 // Not sure where the pc points to, fallback to default
2337 // stack overflow handling
2338 return false;
2339 } else {
2340 *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
2341 // in compiled code, the stack banging is performed just after the return pc
2342 // has been pushed on the stack
2343 *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
2344 if (!fr->is_java_frame()) {
2345 // See java_sender() comment above.
2346 *fr = fr->java_sender();
2347 }
2348 }
2349 }
2350 assert(fr->is_java_frame(), "Safety check");
2351 return true;
2352 }
2353
2354 #if INCLUDE_AOT
2355 LONG WINAPI topLevelVectoredExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2356 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2357 address addr = (address) exceptionRecord->ExceptionInformation[1];
2358 address pc = (address) exceptionInfo->ContextRecord->Rip;
2359
2360 // Handle the case where we get an implicit exception in AOT generated
2361 // code. AOT DLL's loaded are not registered for structured exceptions.
2362 // If the exception occurred in the codeCache or AOT code, pass control
2363 // to our normal exception handler.
2364 CodeBlob* cb = CodeCache::find_blob(pc);
2365 if (cb != NULL) {
2366 return topLevelExceptionFilter(exceptionInfo);
2367 }
2368
2369 return EXCEPTION_CONTINUE_SEARCH;
2370 }
2371 #endif
2372
2373 //-----------------------------------------------------------------------------
2374 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2375 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2376 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2377 #ifdef _M_AMD64
2378 address pc = (address) exceptionInfo->ContextRecord->Rip;
2379 #else
2380 address pc = (address) exceptionInfo->ContextRecord->Eip;
2381 #endif
2382 Thread* t = Thread::current_or_null_safe();
2383
2384 // Handle SafeFetch32 and SafeFetchN exceptions.
2385 if (StubRoutines::is_safefetch_fault(pc)) {
2386 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2387 }
2388
2389 #ifndef _WIN64
2390 // Execution protection violation - win32 running on AMD64 only
2391 // Handled first to avoid misdiagnosis as a "normal" access violation;
2392 // This is safe to do because we have a new/unique ExceptionInformation
2393 // code for this condition.
2394 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2395 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2396 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2397 address addr = (address) exceptionRecord->ExceptionInformation[1];
2398
2399 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2400 int page_size = os::vm_page_size();
2401
2402 // Make sure the pc and the faulting address are sane.
2403 //
2404 // If an instruction spans a page boundary, and the page containing
2405 // the beginning of the instruction is executable but the following
2406 // page is not, the pc and the faulting address might be slightly
2407 // different - we still want to unguard the 2nd page in this case.
2408 //
2409 // 15 bytes seems to be a (very) safe value for max instruction size.
2410 bool pc_is_near_addr =
2411 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2412 bool instr_spans_page_boundary =
2413 (align_down((intptr_t) pc ^ (intptr_t) addr,
2414 (intptr_t) page_size) > 0);
2415
2416 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2417 static volatile address last_addr =
2418 (address) os::non_memory_address_word();
2419
2420 // In conservative mode, don't unguard unless the address is in the VM
2421 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2422 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2423
2424 // Set memory to RWX and retry
2425 address page_start = align_down(addr, page_size);
2426 bool res = os::protect_memory((char*) page_start, page_size,
2427 os::MEM_PROT_RWX);
2428
2429 log_debug(os)("Execution protection violation "
2430 "at " INTPTR_FORMAT
2431 ", unguarding " INTPTR_FORMAT ": %s", p2i(addr),
2432 p2i(page_start), (res ? "success" : os::strerror(errno)));
2433
2434 // Set last_addr so if we fault again at the same address, we don't
2435 // end up in an endless loop.
2436 //
2437 // There are two potential complications here. Two threads trapping
2438 // at the same address at the same time could cause one of the
2439 // threads to think it already unguarded, and abort the VM. Likely
2440 // very rare.
2441 //
2442 // The other race involves two threads alternately trapping at
2443 // different addresses and failing to unguard the page, resulting in
2444 // an endless loop. This condition is probably even more unlikely
2445 // than the first.
2446 //
2447 // Although both cases could be avoided by using locks or thread
2448 // local last_addr, these solutions are unnecessary complication:
2449 // this handler is a best-effort safety net, not a complete solution.
2450 // It is disabled by default and should only be used as a workaround
2451 // in case we missed any no-execute-unsafe VM code.
2452
2453 last_addr = addr;
2454
2455 return EXCEPTION_CONTINUE_EXECUTION;
2456 }
2457 }
2458
2459 // Last unguard failed or not unguarding
2460 tty->print_raw_cr("Execution protection violation");
2461 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2462 exceptionInfo->ContextRecord);
2463 return EXCEPTION_CONTINUE_SEARCH;
2464 }
2465 }
2466 #endif // _WIN64
2467
2468 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2469 VM_Version::is_cpuinfo_segv_addr(pc)) {
2470 // Verify that OS save/restore AVX registers.
2471 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2472 }
2473
2474 if (t != NULL && t->is_Java_thread()) {
2475 JavaThread* thread = (JavaThread*) t;
2476 bool in_java = thread->thread_state() == _thread_in_Java;
2477
2478 // Handle potential stack overflows up front.
2479 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2480 if (thread->stack_guards_enabled()) {
2481 if (in_java) {
2482 frame fr;
2483 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2484 address addr = (address) exceptionRecord->ExceptionInformation[1];
2485 if (os::win32::get_frame_at_stack_banging_point(thread, exceptionInfo, pc, &fr)) {
2486 assert(fr.is_java_frame(), "Must be a Java frame");
2487 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
2488 }
2489 }
2490 // Yellow zone violation. The o/s has unprotected the first yellow
2491 // zone page for us. Note: must call disable_stack_yellow_zone to
2492 // update the enabled status, even if the zone contains only one page.
2493 assert(thread->thread_state() != _thread_in_vm, "Undersized StackShadowPages");
2494 thread->disable_stack_yellow_reserved_zone();
2495 // If not in java code, return and hope for the best.
2496 return in_java
2497 ? Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2498 : EXCEPTION_CONTINUE_EXECUTION;
2499 } else {
2500 // Fatal red zone violation.
2501 thread->disable_stack_red_zone();
2502 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2503 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2504 exceptionInfo->ContextRecord);
2505 return EXCEPTION_CONTINUE_SEARCH;
2506 }
2507 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2508 // Either stack overflow or null pointer exception.
2509 if (in_java) {
2510 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2511 address addr = (address) exceptionRecord->ExceptionInformation[1];
2512 address stack_end = thread->stack_end();
2513 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2514 // Stack overflow.
2515 assert(!os::uses_stack_guard_pages(),
2516 "should be caught by red zone code above.");
2517 return Handle_Exception(exceptionInfo,
2518 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2519 }
2520 // Check for safepoint polling and implicit null
2521 // We only expect null pointers in the stubs (vtable)
2522 // the rest are checked explicitly now.
2523 CodeBlob* cb = CodeCache::find_blob(pc);
2524 if (cb != NULL) {
2525 if (os::is_poll_address(addr)) {
2526 address stub = SharedRuntime::get_poll_stub(pc);
2527 return Handle_Exception(exceptionInfo, stub);
2528 }
2529 }
2530 {
2531 #ifdef _WIN64
2532 // If it's a legal stack address map the entire region in
2533 //
2534 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2535 address addr = (address) exceptionRecord->ExceptionInformation[1];
2536 if (addr > thread->stack_reserved_zone_base() && addr < thread->stack_base()) {
2537 addr = (address)((uintptr_t)addr &
2538 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2539 os::commit_memory((char *)addr, thread->stack_base() - addr,
2540 !ExecMem);
2541 return EXCEPTION_CONTINUE_EXECUTION;
2542 } else
2543 #endif
2544 {
2545 // Null pointer exception.
2546 if (MacroAssembler::uses_implicit_null_check((void*)addr)) {
2547 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2548 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2549 }
2550 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2551 exceptionInfo->ContextRecord);
2552 return EXCEPTION_CONTINUE_SEARCH;
2553 }
2554 }
2555 }
2556
2557 #ifdef _WIN64
2558 // Special care for fast JNI field accessors.
2559 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2560 // in and the heap gets shrunk before the field access.
2561 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2562 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2563 if (addr != (address)-1) {
2564 return Handle_Exception(exceptionInfo, addr);
2565 }
2566 }
2567 #endif
2568
2569 // Stack overflow or null pointer exception in native code.
2570 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2571 exceptionInfo->ContextRecord);
2572 return EXCEPTION_CONTINUE_SEARCH;
2573 } // /EXCEPTION_ACCESS_VIOLATION
2574 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2575
2576 if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
2577 CompiledMethod* nm = NULL;
2578 JavaThread* thread = (JavaThread*)t;
2579 if (in_java) {
2580 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
2581 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
2582 }
2583 if ((thread->thread_state() == _thread_in_vm &&
2584 thread->doing_unsafe_access()) ||
2585 (nm != NULL && nm->has_unsafe_access())) {
2586 return Handle_Exception(exceptionInfo, SharedRuntime::handle_unsafe_access(thread, (address)Assembler::locate_next_instruction(pc)));
2587 }
2588 }
2589
2590 if (in_java) {
2591 switch (exception_code) {
2592 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2593 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2594
2595 case EXCEPTION_INT_OVERFLOW:
2596 return Handle_IDiv_Exception(exceptionInfo);
2597
2598 } // switch
2599 }
2600 if (((thread->thread_state() == _thread_in_Java) ||
2601 (thread->thread_state() == _thread_in_native)) &&
2602 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION) {
2603 LONG result=Handle_FLT_Exception(exceptionInfo);
2604 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2605 }
2606 }
2607
2608 if (exception_code != EXCEPTION_BREAKPOINT) {
2609 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2610 exceptionInfo->ContextRecord);
2611 }
2612 return EXCEPTION_CONTINUE_SEARCH;
2613 }
2614
2615 #ifndef _WIN64
2616 // Special care for fast JNI accessors.
2617 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2618 // the heap gets shrunk before the field access.
2619 // Need to install our own structured exception handler since native code may
2620 // install its own.
2621 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2622 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2623 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2624 address pc = (address) exceptionInfo->ContextRecord->Eip;
2625 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2626 if (addr != (address)-1) {
2627 return Handle_Exception(exceptionInfo, addr);
2628 }
2629 }
2630 return EXCEPTION_CONTINUE_SEARCH;
2631 }
2632
2633 #define DEFINE_FAST_GETFIELD(Return, Fieldname, Result) \
2634 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, \
2635 jobject obj, \
2636 jfieldID fieldID) { \
2637 __try { \
2638 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, \
2639 obj, \
2640 fieldID); \
2641 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*) \
2642 _exception_info())) { \
2643 } \
2644 return 0; \
2645 }
2646
2647 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2648 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2649 DEFINE_FAST_GETFIELD(jchar, char, Char)
2650 DEFINE_FAST_GETFIELD(jshort, short, Short)
2651 DEFINE_FAST_GETFIELD(jint, int, Int)
2652 DEFINE_FAST_GETFIELD(jlong, long, Long)
2653 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2654 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2655
2656 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2657 switch (type) {
2658 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2659 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2660 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2661 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2662 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2663 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2664 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2665 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2666 default: ShouldNotReachHere();
2667 }
2668 return (address)-1;
2669 }
2670 #endif
2671
2672 // Virtual Memory
2673
2674 int os::vm_page_size() { return os::win32::vm_page_size(); }
2675 int os::vm_allocation_granularity() {
2676 return os::win32::vm_allocation_granularity();
2677 }
2678
2679 // Windows large page support is available on Windows 2003. In order to use
2680 // large page memory, the administrator must first assign additional privilege
2681 // to the user:
2682 // + select Control Panel -> Administrative Tools -> Local Security Policy
2683 // + select Local Policies -> User Rights Assignment
2684 // + double click "Lock pages in memory", add users and/or groups
2685 // + reboot
2686 // Note the above steps are needed for administrator as well, as administrators
2687 // by default do not have the privilege to lock pages in memory.
2688 //
2689 // Note about Windows 2003: although the API supports committing large page
2690 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2691 // scenario, I found through experiment it only uses large page if the entire
2692 // memory region is reserved and committed in a single VirtualAlloc() call.
2693 // This makes Windows large page support more or less like Solaris ISM, in
2694 // that the entire heap must be committed upfront. This probably will change
2695 // in the future, if so the code below needs to be revisited.
2696
2697 #ifndef MEM_LARGE_PAGES
2698 #define MEM_LARGE_PAGES 0x20000000
2699 #endif
2700
2701 static HANDLE _hProcess;
2702 static HANDLE _hToken;
2703
2704 // Container for NUMA node list info
2705 class NUMANodeListHolder {
2706 private:
2707 int *_numa_used_node_list; // allocated below
2708 int _numa_used_node_count;
2709
2710 void free_node_list() {
2711 if (_numa_used_node_list != NULL) {
2712 FREE_C_HEAP_ARRAY(int, _numa_used_node_list);
2713 }
2714 }
2715
2716 public:
2717 NUMANodeListHolder() {
2718 _numa_used_node_count = 0;
2719 _numa_used_node_list = NULL;
2720 // do rest of initialization in build routine (after function pointers are set up)
2721 }
2722
2723 ~NUMANodeListHolder() {
2724 free_node_list();
2725 }
2726
2727 bool build() {
2728 DWORD_PTR proc_aff_mask;
2729 DWORD_PTR sys_aff_mask;
2730 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2731 ULONG highest_node_number;
2732 if (!GetNumaHighestNodeNumber(&highest_node_number)) return false;
2733 free_node_list();
2734 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2735 for (unsigned int i = 0; i <= highest_node_number; i++) {
2736 ULONGLONG proc_mask_numa_node;
2737 if (!GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2738 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2739 _numa_used_node_list[_numa_used_node_count++] = i;
2740 }
2741 }
2742 return (_numa_used_node_count > 1);
2743 }
2744
2745 int get_count() { return _numa_used_node_count; }
2746 int get_node_list_entry(int n) {
2747 // for indexes out of range, returns -1
2748 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2749 }
2750
2751 } numa_node_list_holder;
2752
2753
2754
2755 static size_t _large_page_size = 0;
2756
2757 static bool request_lock_memory_privilege() {
2758 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2759 os::current_process_id());
2760
2761 LUID luid;
2762 if (_hProcess != NULL &&
2763 OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2764 LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2765
2766 TOKEN_PRIVILEGES tp;
2767 tp.PrivilegeCount = 1;
2768 tp.Privileges[0].Luid = luid;
2769 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2770
2771 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2772 // privilege. Check GetLastError() too. See MSDN document.
2773 if (AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2774 (GetLastError() == ERROR_SUCCESS)) {
2775 return true;
2776 }
2777 }
2778
2779 return false;
2780 }
2781
2782 static void cleanup_after_large_page_init() {
2783 if (_hProcess) CloseHandle(_hProcess);
2784 _hProcess = NULL;
2785 if (_hToken) CloseHandle(_hToken);
2786 _hToken = NULL;
2787 }
2788
2789 static bool numa_interleaving_init() {
2790 bool success = false;
2791 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2792
2793 // print a warning if UseNUMAInterleaving flag is specified on command line
2794 bool warn_on_failure = use_numa_interleaving_specified;
2795 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2796
2797 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2798 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2799 NUMAInterleaveGranularity = align_up(NUMAInterleaveGranularity, min_interleave_granularity);
2800
2801 if (numa_node_list_holder.build()) {
2802 if (log_is_enabled(Debug, os, cpu)) {
2803 Log(os, cpu) log;
2804 log.debug("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2805 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2806 log.debug(" %d ", numa_node_list_holder.get_node_list_entry(i));
2807 }
2808 }
2809 success = true;
2810 } else {
2811 WARN("Process does not cover multiple NUMA nodes.");
2812 }
2813 if (!success) {
2814 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2815 }
2816 return success;
2817 #undef WARN
2818 }
2819
2820 // this routine is used whenever we need to reserve a contiguous VA range
2821 // but we need to make separate VirtualAlloc calls for each piece of the range
2822 // Reasons for doing this:
2823 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2824 // * UseNUMAInterleaving requires a separate node for each piece
2825 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags,
2826 DWORD prot,
2827 bool should_inject_error = false) {
2828 char * p_buf;
2829 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2830 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2831 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2832
2833 // first reserve enough address space in advance since we want to be
2834 // able to break a single contiguous virtual address range into multiple
2835 // large page commits but WS2003 does not allow reserving large page space
2836 // so we just use 4K pages for reserve, this gives us a legal contiguous
2837 // address space. then we will deallocate that reservation, and re alloc
2838 // using large pages
2839 const size_t size_of_reserve = bytes + chunk_size;
2840 if (bytes > size_of_reserve) {
2841 // Overflowed.
2842 return NULL;
2843 }
2844 p_buf = (char *) VirtualAlloc(addr,
2845 size_of_reserve, // size of Reserve
2846 MEM_RESERVE,
2847 PAGE_READWRITE);
2848 // If reservation failed, return NULL
2849 if (p_buf == NULL) return NULL;
2850 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2851 os::release_memory(p_buf, bytes + chunk_size);
2852
2853 // we still need to round up to a page boundary (in case we are using large pages)
2854 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2855 // instead we handle this in the bytes_to_rq computation below
2856 p_buf = align_up(p_buf, page_size);
2857
2858 // now go through and allocate one chunk at a time until all bytes are
2859 // allocated
2860 size_t bytes_remaining = bytes;
2861 // An overflow of align_up() would have been caught above
2862 // in the calculation of size_of_reserve.
2863 char * next_alloc_addr = p_buf;
2864 HANDLE hProc = GetCurrentProcess();
2865
2866 #ifdef ASSERT
2867 // Variable for the failure injection
2868 int ran_num = os::random();
2869 size_t fail_after = ran_num % bytes;
2870 #endif
2871
2872 int count=0;
2873 while (bytes_remaining) {
2874 // select bytes_to_rq to get to the next chunk_size boundary
2875
2876 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2877 // Note allocate and commit
2878 char * p_new;
2879
2880 #ifdef ASSERT
2881 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2882 #else
2883 const bool inject_error_now = false;
2884 #endif
2885
2886 if (inject_error_now) {
2887 p_new = NULL;
2888 } else {
2889 if (!UseNUMAInterleaving) {
2890 p_new = (char *) VirtualAlloc(next_alloc_addr,
2891 bytes_to_rq,
2892 flags,
2893 prot);
2894 } else {
2895 // get the next node to use from the used_node_list
2896 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
2897 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
2898 p_new = (char *)VirtualAllocExNuma(hProc, next_alloc_addr, bytes_to_rq, flags, prot, node);
2899 }
2900 }
2901
2902 if (p_new == NULL) {
2903 // Free any allocated pages
2904 if (next_alloc_addr > p_buf) {
2905 // Some memory was committed so release it.
2906 size_t bytes_to_release = bytes - bytes_remaining;
2907 // NMT has yet to record any individual blocks, so it
2908 // need to create a dummy 'reserve' record to match
2909 // the release.
2910 MemTracker::record_virtual_memory_reserve((address)p_buf,
2911 bytes_to_release, CALLER_PC);
2912 os::release_memory(p_buf, bytes_to_release);
2913 }
2914 #ifdef ASSERT
2915 if (should_inject_error) {
2916 log_develop_debug(pagesize)("Reserving pages individually failed.");
2917 }
2918 #endif
2919 return NULL;
2920 }
2921
2922 bytes_remaining -= bytes_to_rq;
2923 next_alloc_addr += bytes_to_rq;
2924 count++;
2925 }
2926 // Although the memory is allocated individually, it is returned as one.
2927 // NMT records it as one block.
2928 if ((flags & MEM_COMMIT) != 0) {
2929 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
2930 } else {
2931 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
2932 }
2933
2934 // made it this far, success
2935 return p_buf;
2936 }
2937
2938
2939
2940 void os::large_page_init() {
2941 if (!UseLargePages) return;
2942
2943 // print a warning if any large page related flag is specified on command line
2944 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2945 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2946 bool success = false;
2947
2948 #define WARN(msg) if (warn_on_failure) { warning(msg); }
2949 if (request_lock_memory_privilege()) {
2950 size_t s = GetLargePageMinimum();
2951 if (s) {
2952 #if defined(IA32) || defined(AMD64)
2953 if (s > 4*M || LargePageSizeInBytes > 4*M) {
2954 WARN("JVM cannot use large pages bigger than 4mb.");
2955 } else {
2956 #endif
2957 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
2958 _large_page_size = LargePageSizeInBytes;
2959 } else {
2960 _large_page_size = s;
2961 }
2962 success = true;
2963 #if defined(IA32) || defined(AMD64)
2964 }
2965 #endif
2966 } else {
2967 WARN("Large page is not supported by the processor.");
2968 }
2969 } else {
2970 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
2971 }
2972 #undef WARN
2973
2974 const size_t default_page_size = (size_t) vm_page_size();
2975 if (success && _large_page_size > default_page_size) {
2976 _page_sizes[0] = _large_page_size;
2977 _page_sizes[1] = default_page_size;
2978 _page_sizes[2] = 0;
2979 }
2980
2981 cleanup_after_large_page_init();
2982 UseLargePages = success;
2983 }
2984
2985 int os::create_file_for_heap(const char* dir) {
2986
2987 const char name_template[] = "/jvmheap.XXXXXX";
2988
2989 size_t fullname_len = strlen(dir) + strlen(name_template);
2990 char *fullname = (char*)os::malloc(fullname_len + 1, mtInternal);
2991 if (fullname == NULL) {
2992 vm_exit_during_initialization(err_msg("Malloc failed during creation of backing file for heap (%s)", os::strerror(errno)));
2993 return -1;
2994 }
2995 int n = snprintf(fullname, fullname_len + 1, "%s%s", dir, name_template);
2996 assert((size_t)n == fullname_len, "Unexpected number of characters in string");
2997
2998 os::native_path(fullname);
2999
3000 char *path = _mktemp(fullname);
3001 if (path == NULL) {
3002 warning("_mktemp could not create file name from template %s (%s)", fullname, os::strerror(errno));
3003 os::free(fullname);
3004 return -1;
3005 }
3006
3007 int fd = _open(path, O_RDWR | O_CREAT | O_TEMPORARY | O_EXCL, S_IWRITE | S_IREAD);
3008
3009 os::free(fullname);
3010 if (fd < 0) {
3011 warning("Problem opening file for heap (%s)", os::strerror(errno));
3012 return -1;
3013 }
3014 return fd;
3015 }
3016
3017 // If 'base' is not NULL, function will return NULL if it cannot get 'base'
3018 char* os::map_memory_to_file(char* base, size_t size, int fd) {
3019 assert(fd != -1, "File descriptor is not valid");
3020
3021 HANDLE fh = (HANDLE)_get_osfhandle(fd);
3022 #ifdef _LP64
3023 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3024 (DWORD)(size >> 32), (DWORD)(size & 0xFFFFFFFF), NULL);
3025 #else
3026 HANDLE fileMapping = CreateFileMapping(fh, NULL, PAGE_READWRITE,
3027 0, (DWORD)size, NULL);
3028 #endif
3029 if (fileMapping == NULL) {
3030 if (GetLastError() == ERROR_DISK_FULL) {
3031 vm_exit_during_initialization(err_msg("Could not allocate sufficient disk space for Java heap"));
3032 }
3033 else {
3034 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
3035 }
3036
3037 return NULL;
3038 }
3039
3040 LPVOID addr = MapViewOfFileEx(fileMapping, FILE_MAP_WRITE, 0, 0, size, base);
3041
3042 CloseHandle(fileMapping);
3043
3044 return (char*)addr;
3045 }
3046
3047 char* os::replace_existing_mapping_with_file_mapping(char* base, size_t size, int fd) {
3048 assert(fd != -1, "File descriptor is not valid");
3049 assert(base != NULL, "Base address cannot be NULL");
3050
3051 release_memory(base, size);
3052 return map_memory_to_file(base, size, fd);
3053 }
3054
3055 // On win32, one cannot release just a part of reserved memory, it's an
3056 // all or nothing deal. When we split a reservation, we must break the
3057 // reservation into two reservations.
3058 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3059 bool realloc) {
3060 if (size > 0) {
3061 release_memory(base, size);
3062 if (realloc) {
3063 reserve_memory(split, base);
3064 }
3065 if (size != split) {
3066 reserve_memory(size - split, base + split);
3067 }
3068 }
3069 }
3070
3071 // Multiple threads can race in this code but it's not possible to unmap small sections of
3072 // virtual space to get requested alignment, like posix-like os's.
3073 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3074 char* os::reserve_memory_aligned(size_t size, size_t alignment, int file_desc) {
3075 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3076 "Alignment must be a multiple of allocation granularity (page size)");
3077 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3078
3079 size_t extra_size = size + alignment;
3080 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3081
3082 char* aligned_base = NULL;
3083
3084 do {
3085 char* extra_base = os::reserve_memory(extra_size, NULL, alignment, file_desc);
3086 if (extra_base == NULL) {
3087 return NULL;
3088 }
3089 // Do manual alignment
3090 aligned_base = align_up(extra_base, alignment);
3091
3092 if (file_desc != -1) {
3093 os::unmap_memory(extra_base, extra_size);
3094 } else {
3095 os::release_memory(extra_base, extra_size);
3096 }
3097
3098 aligned_base = os::reserve_memory(size, aligned_base, 0, file_desc);
3099
3100 } while (aligned_base == NULL);
3101
3102 return aligned_base;
3103 }
3104
3105 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3106 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3107 "reserve alignment");
3108 assert(bytes % os::vm_page_size() == 0, "reserve page size");
3109 char* res;
3110 // note that if UseLargePages is on, all the areas that require interleaving
3111 // will go thru reserve_memory_special rather than thru here.
3112 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3113 if (!use_individual) {
3114 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3115 } else {
3116 elapsedTimer reserveTimer;
3117 if (Verbose && PrintMiscellaneous) reserveTimer.start();
3118 // in numa interleaving, we have to allocate pages individually
3119 // (well really chunks of NUMAInterleaveGranularity size)
3120 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3121 if (res == NULL) {
3122 warning("NUMA page allocation failed");
3123 }
3124 if (Verbose && PrintMiscellaneous) {
3125 reserveTimer.stop();
3126 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3127 reserveTimer.milliseconds(), reserveTimer.ticks());
3128 }
3129 }
3130 assert(res == NULL || addr == NULL || addr == res,
3131 "Unexpected address from reserve.");
3132
3133 return res;
3134 }
3135
3136 // Reserve memory at an arbitrary address, only if that area is
3137 // available (and not reserved for something else).
3138 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3139 // Windows os::reserve_memory() fails of the requested address range is
3140 // not avilable.
3141 return reserve_memory(bytes, requested_addr);
3142 }
3143
3144 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
3145 assert(file_desc >= 0, "file_desc is not valid");
3146 return map_memory_to_file(requested_addr, bytes, file_desc);
3147 }
3148
3149 size_t os::large_page_size() {
3150 return _large_page_size;
3151 }
3152
3153 bool os::can_commit_large_page_memory() {
3154 // Windows only uses large page memory when the entire region is reserved
3155 // and committed in a single VirtualAlloc() call. This may change in the
3156 // future, but with Windows 2003 it's not possible to commit on demand.
3157 return false;
3158 }
3159
3160 bool os::can_execute_large_page_memory() {
3161 return true;
3162 }
3163
3164 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr,
3165 bool exec) {
3166 assert(UseLargePages, "only for large pages");
3167
3168 if (!is_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3169 return NULL; // Fallback to small pages.
3170 }
3171
3172 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3173 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3174
3175 // with large pages, there are two cases where we need to use Individual Allocation
3176 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3177 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3178 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3179 log_debug(pagesize)("Reserving large pages individually.");
3180
3181 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3182 if (p_buf == NULL) {
3183 // give an appropriate warning message
3184 if (UseNUMAInterleaving) {
3185 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3186 }
3187 if (UseLargePagesIndividualAllocation) {
3188 warning("Individually allocated large pages failed, "
3189 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3190 }
3191 return NULL;
3192 }
3193
3194 return p_buf;
3195
3196 } else {
3197 log_debug(pagesize)("Reserving large pages in a single large chunk.");
3198
3199 // normal policy just allocate it all at once
3200 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3201 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3202 if (res != NULL) {
3203 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3204 }
3205
3206 return res;
3207 }
3208 }
3209
3210 bool os::release_memory_special(char* base, size_t bytes) {
3211 assert(base != NULL, "Sanity check");
3212 return release_memory(base, bytes);
3213 }
3214
3215 void os::print_statistics() {
3216 }
3217
3218 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3219 int err = os::get_last_error();
3220 char buf[256];
3221 size_t buf_len = os::lasterror(buf, sizeof(buf));
3222 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3223 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3224 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3225 }
3226
3227 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3228 if (bytes == 0) {
3229 // Don't bother the OS with noops.
3230 return true;
3231 }
3232 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3233 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3234 // Don't attempt to print anything if the OS call fails. We're
3235 // probably low on resources, so the print itself may cause crashes.
3236
3237 // unless we have NUMAInterleaving enabled, the range of a commit
3238 // is always within a reserve covered by a single VirtualAlloc
3239 // in that case we can just do a single commit for the requested size
3240 if (!UseNUMAInterleaving) {
3241 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3242 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3243 return false;
3244 }
3245 if (exec) {
3246 DWORD oldprot;
3247 // Windows doc says to use VirtualProtect to get execute permissions
3248 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3249 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3250 return false;
3251 }
3252 }
3253 return true;
3254 } else {
3255
3256 // when NUMAInterleaving is enabled, the commit might cover a range that
3257 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3258 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3259 // returns represents the number of bytes that can be committed in one step.
3260 size_t bytes_remaining = bytes;
3261 char * next_alloc_addr = addr;
3262 while (bytes_remaining > 0) {
3263 MEMORY_BASIC_INFORMATION alloc_info;
3264 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3265 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3266 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3267 PAGE_READWRITE) == NULL) {
3268 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3269 exec);)
3270 return false;
3271 }
3272 if (exec) {
3273 DWORD oldprot;
3274 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3275 PAGE_EXECUTE_READWRITE, &oldprot)) {
3276 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3277 exec);)
3278 return false;
3279 }
3280 }
3281 bytes_remaining -= bytes_to_rq;
3282 next_alloc_addr += bytes_to_rq;
3283 }
3284 }
3285 // if we made it this far, return true
3286 return true;
3287 }
3288
3289 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3290 bool exec) {
3291 // alignment_hint is ignored on this OS
3292 return pd_commit_memory(addr, size, exec);
3293 }
3294
3295 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3296 const char* mesg) {
3297 assert(mesg != NULL, "mesg must be specified");
3298 if (!pd_commit_memory(addr, size, exec)) {
3299 warn_fail_commit_memory(addr, size, exec);
3300 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
3301 }
3302 }
3303
3304 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3305 size_t alignment_hint, bool exec,
3306 const char* mesg) {
3307 // alignment_hint is ignored on this OS
3308 pd_commit_memory_or_exit(addr, size, exec, mesg);
3309 }
3310
3311 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3312 if (bytes == 0) {
3313 // Don't bother the OS with noops.
3314 return true;
3315 }
3316 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3317 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3318 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3319 }
3320
3321 bool os::pd_release_memory(char* addr, size_t bytes) {
3322 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3323 }
3324
3325 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3326 return os::commit_memory(addr, size, !ExecMem);
3327 }
3328
3329 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3330 return os::uncommit_memory(addr, size);
3331 }
3332
3333 static bool protect_pages_individually(char* addr, size_t bytes, unsigned int p, DWORD *old_status) {
3334 uint count = 0;
3335 bool ret = false;
3336 size_t bytes_remaining = bytes;
3337 char * next_protect_addr = addr;
3338
3339 // Use VirtualQuery() to get the chunk size.
3340 while (bytes_remaining) {
3341 MEMORY_BASIC_INFORMATION alloc_info;
3342 if (VirtualQuery(next_protect_addr, &alloc_info, sizeof(alloc_info)) == 0) {
3343 return false;
3344 }
3345
3346 size_t bytes_to_protect = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3347 // We used different API at allocate_pages_individually() based on UseNUMAInterleaving,
3348 // but we don't distinguish here as both cases are protected by same API.
3349 ret = VirtualProtect(next_protect_addr, bytes_to_protect, p, old_status) != 0;
3350 warning("Failed protecting pages individually for chunk #%u", count);
3351 if (!ret) {
3352 return false;
3353 }
3354
3355 bytes_remaining -= bytes_to_protect;
3356 next_protect_addr += bytes_to_protect;
3357 count++;
3358 }
3359 return ret;
3360 }
3361
3362 // Set protections specified
3363 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3364 bool is_committed) {
3365 unsigned int p = 0;
3366 switch (prot) {
3367 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3368 case MEM_PROT_READ: p = PAGE_READONLY; break;
3369 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3370 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3371 default:
3372 ShouldNotReachHere();
3373 }
3374
3375 DWORD old_status;
3376
3377 // Strange enough, but on Win32 one can change protection only for committed
3378 // memory, not a big deal anyway, as bytes less or equal than 64K
3379 if (!is_committed) {
3380 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3381 "cannot commit protection page");
3382 }
3383 // One cannot use os::guard_memory() here, as on Win32 guard page
3384 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3385 //
3386 // Pages in the region become guard pages. Any attempt to access a guard page
3387 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3388 // the guard page status. Guard pages thus act as a one-time access alarm.
3389 bool ret;
3390 if (UseNUMAInterleaving) {
3391 // If UseNUMAInterleaving is enabled, the pages may have been allocated a chunk at a time,
3392 // so we must protect the chunks individually.
3393 ret = protect_pages_individually(addr, bytes, p, &old_status);
3394 } else {
3395 ret = VirtualProtect(addr, bytes, p, &old_status) != 0;
3396 }
3397 #ifdef ASSERT
3398 if (!ret) {
3399 int err = os::get_last_error();
3400 char buf[256];
3401 size_t buf_len = os::lasterror(buf, sizeof(buf));
3402 warning("INFO: os::protect_memory(" PTR_FORMAT ", " SIZE_FORMAT
3403 ") failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3404 buf_len != 0 ? buf : "<no_error_string>", err);
3405 }
3406 #endif
3407 return ret;
3408 }
3409
3410 bool os::guard_memory(char* addr, size_t bytes) {
3411 DWORD old_status;
3412 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3413 }
3414
3415 bool os::unguard_memory(char* addr, size_t bytes) {
3416 DWORD old_status;
3417 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3418 }
3419
3420 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3421 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3422 void os::numa_make_global(char *addr, size_t bytes) { }
3423 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3424 bool os::numa_topology_changed() { return false; }
3425 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3426 int os::numa_get_group_id() { return 0; }
3427 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3428 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3429 // Provide an answer for UMA systems
3430 ids[0] = 0;
3431 return 1;
3432 } else {
3433 // check for size bigger than actual groups_num
3434 size = MIN2(size, numa_get_groups_num());
3435 for (int i = 0; i < (int)size; i++) {
3436 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3437 }
3438 return size;
3439 }
3440 }
3441
3442 bool os::get_page_info(char *start, page_info* info) {
3443 return false;
3444 }
3445
3446 char *os::scan_pages(char *start, char* end, page_info* page_expected,
3447 page_info* page_found) {
3448 return end;
3449 }
3450
3451 char* os::non_memory_address_word() {
3452 // Must never look like an address returned by reserve_memory,
3453 // even in its subfields (as defined by the CPU immediate fields,
3454 // if the CPU splits constants across multiple instructions).
3455 return (char*)-1;
3456 }
3457
3458 #define MAX_ERROR_COUNT 100
3459 #define SYS_THREAD_ERROR 0xffffffffUL
3460
3461 void os::pd_start_thread(Thread* thread) {
3462 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3463 // Returns previous suspend state:
3464 // 0: Thread was not suspended
3465 // 1: Thread is running now
3466 // >1: Thread is still suspended.
3467 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3468 }
3469
3470 class HighResolutionInterval : public CHeapObj<mtThread> {
3471 // The default timer resolution seems to be 10 milliseconds.
3472 // (Where is this written down?)
3473 // If someone wants to sleep for only a fraction of the default,
3474 // then we set the timer resolution down to 1 millisecond for
3475 // the duration of their interval.
3476 // We carefully set the resolution back, since otherwise we
3477 // seem to incur an overhead (3%?) that we don't need.
3478 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3479 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3480 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3481 // timeBeginPeriod() if the relative error exceeded some threshold.
3482 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3483 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3484 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3485 // resolution timers running.
3486 private:
3487 jlong resolution;
3488 public:
3489 HighResolutionInterval(jlong ms) {
3490 resolution = ms % 10L;
3491 if (resolution != 0) {
3492 MMRESULT result = timeBeginPeriod(1L);
3493 }
3494 }
3495 ~HighResolutionInterval() {
3496 if (resolution != 0) {
3497 MMRESULT result = timeEndPeriod(1L);
3498 }
3499 resolution = 0L;
3500 }
3501 };
3502
3503 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3504 jlong limit = (jlong) MAXDWORD;
3505
3506 while (ms > limit) {
3507 int res;
3508 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT) {
3509 return res;
3510 }
3511 ms -= limit;
3512 }
3513
3514 assert(thread == Thread::current(), "thread consistency check");
3515 OSThread* osthread = thread->osthread();
3516 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3517 int result;
3518 if (interruptable) {
3519 assert(thread->is_Java_thread(), "must be java thread");
3520 JavaThread *jt = (JavaThread *) thread;
3521 ThreadBlockInVM tbivm(jt);
3522
3523 jt->set_suspend_equivalent();
3524 // cleared by handle_special_suspend_equivalent_condition() or
3525 // java_suspend_self() via check_and_wait_while_suspended()
3526
3527 HANDLE events[1];
3528 events[0] = osthread->interrupt_event();
3529 HighResolutionInterval *phri=NULL;
3530 if (!ForceTimeHighResolution) {
3531 phri = new HighResolutionInterval(ms);
3532 }
3533 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3534 result = OS_TIMEOUT;
3535 } else {
3536 ResetEvent(osthread->interrupt_event());
3537 osthread->set_interrupted(false);
3538 result = OS_INTRPT;
3539 }
3540 delete phri; //if it is NULL, harmless
3541
3542 // were we externally suspended while we were waiting?
3543 jt->check_and_wait_while_suspended();
3544 } else {
3545 assert(!thread->is_Java_thread(), "must not be java thread");
3546 Sleep((long) ms);
3547 result = OS_TIMEOUT;
3548 }
3549 return result;
3550 }
3551
3552 // Short sleep, direct OS call.
3553 //
3554 // ms = 0, means allow others (if any) to run.
3555 //
3556 void os::naked_short_sleep(jlong ms) {
3557 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3558 Sleep(ms);
3559 }
3560
3561 void os::naked_short_nanosleep(jlong ns) {
3562 assert(ns > -1 && ns < NANOUNITS, "Un-interruptable sleep, short time use only");
3563 LARGE_INTEGER hundreds_nanos = { 0 };
3564 HANDLE wait_timer = ::CreateWaitableTimer(NULL /* attributes*/,
3565 true /* manual reset */,
3566 NULL /* name */ );
3567 if (wait_timer == NULL) {
3568 log_warning(os)("Failed to CreateWaitableTimer: %u", GetLastError());
3569 return;
3570 }
3571
3572 // We need a minimum of one hundred nanos.
3573 ns = ns > 100 ? ns : 100;
3574
3575 // Round ns to the nearst hundred of nanos.
3576 // Negative values indicate relative time.
3577 hundreds_nanos.QuadPart = -((ns + 50) / 100);
3578
3579 if (::SetWaitableTimer(wait_timer /* handle */,
3580 &hundreds_nanos /* due time */,
3581 0 /* period */,
3582 NULL /* comp func */,
3583 NULL /* comp func args */,
3584 FALSE /* resume */)) {
3585 DWORD res = ::WaitForSingleObject(wait_timer /* handle */, INFINITE /* timeout */);
3586 if (res != WAIT_OBJECT_0) {
3587 if (res == WAIT_FAILED) {
3588 log_warning(os)("Failed to WaitForSingleObject: %u", GetLastError());
3589 } else {
3590 log_warning(os)("Unexpected return from WaitForSingleObject: %s",
3591 res == WAIT_ABANDONED ? "WAIT_ABANDONED" : "WAIT_TIMEOUT");
3592 }
3593 }
3594 }
3595 ::CloseHandle(wait_timer /* handle */);
3596 }
3597
3598 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3599 void os::infinite_sleep() {
3600 while (true) { // sleep forever ...
3601 Sleep(100000); // ... 100 seconds at a time
3602 }
3603 }
3604
3605 typedef BOOL (WINAPI * STTSignature)(void);
3606
3607 void os::naked_yield() {
3608 // Consider passing back the return value from SwitchToThread().
3609 SwitchToThread();
3610 }
3611
3612 // Win32 only gives you access to seven real priorities at a time,
3613 // so we compress Java's ten down to seven. It would be better
3614 // if we dynamically adjusted relative priorities.
3615
3616 int os::java_to_os_priority[CriticalPriority + 1] = {
3617 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3618 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3619 THREAD_PRIORITY_LOWEST, // 2
3620 THREAD_PRIORITY_BELOW_NORMAL, // 3
3621 THREAD_PRIORITY_BELOW_NORMAL, // 4
3622 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3623 THREAD_PRIORITY_NORMAL, // 6
3624 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3625 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3626 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3627 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3628 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3629 };
3630
3631 int prio_policy1[CriticalPriority + 1] = {
3632 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3633 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3634 THREAD_PRIORITY_LOWEST, // 2
3635 THREAD_PRIORITY_BELOW_NORMAL, // 3
3636 THREAD_PRIORITY_BELOW_NORMAL, // 4
3637 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3638 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3639 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3640 THREAD_PRIORITY_HIGHEST, // 8
3641 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3642 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3643 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3644 };
3645
3646 static int prio_init() {
3647 // If ThreadPriorityPolicy is 1, switch tables
3648 if (ThreadPriorityPolicy == 1) {
3649 int i;
3650 for (i = 0; i < CriticalPriority + 1; i++) {
3651 os::java_to_os_priority[i] = prio_policy1[i];
3652 }
3653 }
3654 if (UseCriticalJavaThreadPriority) {
3655 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
3656 }
3657 return 0;
3658 }
3659
3660 OSReturn os::set_native_priority(Thread* thread, int priority) {
3661 if (!UseThreadPriorities) return OS_OK;
3662 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3663 return ret ? OS_OK : OS_ERR;
3664 }
3665
3666 OSReturn os::get_native_priority(const Thread* const thread,
3667 int* priority_ptr) {
3668 if (!UseThreadPriorities) {
3669 *priority_ptr = java_to_os_priority[NormPriority];
3670 return OS_OK;
3671 }
3672 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3673 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3674 assert(false, "GetThreadPriority failed");
3675 return OS_ERR;
3676 }
3677 *priority_ptr = os_prio;
3678 return OS_OK;
3679 }
3680
3681 void os::interrupt(Thread* thread) {
3682 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3683
3684 OSThread* osthread = thread->osthread();
3685 osthread->set_interrupted(true);
3686 // More than one thread can get here with the same value of osthread,
3687 // resulting in multiple notifications. We do, however, want the store
3688 // to interrupted() to be visible to other threads before we post
3689 // the interrupt event.
3690 OrderAccess::release();
3691 SetEvent(osthread->interrupt_event());
3692 // For JSR166: unpark after setting status
3693 if (thread->is_Java_thread()) {
3694 ((JavaThread*)thread)->parker()->unpark();
3695 }
3696
3697 ParkEvent * ev = thread->_ParkEvent;
3698 if (ev != NULL) ev->unpark();
3699 }
3700
3701
3702 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3703 debug_only(Thread::check_for_dangling_thread_pointer(thread);)
3704
3705 OSThread* osthread = thread->osthread();
3706 // There is no synchronization between the setting of the interrupt
3707 // and it being cleared here. It is critical - see 6535709 - that
3708 // we only clear the interrupt state, and reset the interrupt event,
3709 // if we are going to report that we were indeed interrupted - else
3710 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3711 // depending on the timing. By checking thread interrupt event to see
3712 // if the thread gets real interrupt thus prevent spurious wakeup.
3713 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3714 if (interrupted && clear_interrupted) {
3715 osthread->set_interrupted(false);
3716 ResetEvent(osthread->interrupt_event());
3717 } // Otherwise leave the interrupted state alone
3718
3719 return interrupted;
3720 }
3721
3722 // GetCurrentThreadId() returns DWORD
3723 intx os::current_thread_id() { return GetCurrentThreadId(); }
3724
3725 static int _initial_pid = 0;
3726
3727 int os::current_process_id() {
3728 return (_initial_pid ? _initial_pid : _getpid());
3729 }
3730
3731 int os::win32::_vm_page_size = 0;
3732 int os::win32::_vm_allocation_granularity = 0;
3733 int os::win32::_processor_type = 0;
3734 // Processor level is not available on non-NT systems, use vm_version instead
3735 int os::win32::_processor_level = 0;
3736 julong os::win32::_physical_memory = 0;
3737 size_t os::win32::_default_stack_size = 0;
3738
3739 intx os::win32::_os_thread_limit = 0;
3740 volatile intx os::win32::_os_thread_count = 0;
3741
3742 bool os::win32::_is_windows_server = false;
3743
3744 // 6573254
3745 // Currently, the bug is observed across all the supported Windows releases,
3746 // including the latest one (as of this writing - Windows Server 2012 R2)
3747 bool os::win32::_has_exit_bug = true;
3748
3749 void os::win32::initialize_system_info() {
3750 SYSTEM_INFO si;
3751 GetSystemInfo(&si);
3752 _vm_page_size = si.dwPageSize;
3753 _vm_allocation_granularity = si.dwAllocationGranularity;
3754 _processor_type = si.dwProcessorType;
3755 _processor_level = si.wProcessorLevel;
3756 set_processor_count(si.dwNumberOfProcessors);
3757
3758 MEMORYSTATUSEX ms;
3759 ms.dwLength = sizeof(ms);
3760
3761 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3762 // dwMemoryLoad (% of memory in use)
3763 GlobalMemoryStatusEx(&ms);
3764 _physical_memory = ms.ullTotalPhys;
3765
3766 if (FLAG_IS_DEFAULT(MaxRAM)) {
3767 // Adjust MaxRAM according to the maximum virtual address space available.
3768 FLAG_SET_DEFAULT(MaxRAM, MIN2(MaxRAM, (uint64_t) ms.ullTotalVirtual));
3769 }
3770
3771 OSVERSIONINFOEX oi;
3772 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3773 GetVersionEx((OSVERSIONINFO*)&oi);
3774 switch (oi.dwPlatformId) {
3775 case VER_PLATFORM_WIN32_NT:
3776 {
3777 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3778 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3779 oi.wProductType == VER_NT_SERVER) {
3780 _is_windows_server = true;
3781 }
3782 }
3783 break;
3784 default: fatal("Unknown platform");
3785 }
3786
3787 _default_stack_size = os::current_stack_size();
3788 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3789 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3790 "stack size not a multiple of page size");
3791
3792 initialize_performance_counter();
3793 }
3794
3795
3796 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf,
3797 int ebuflen) {
3798 char path[MAX_PATH];
3799 DWORD size;
3800 DWORD pathLen = (DWORD)sizeof(path);
3801 HINSTANCE result = NULL;
3802
3803 // only allow library name without path component
3804 assert(strchr(name, '\\') == NULL, "path not allowed");
3805 assert(strchr(name, ':') == NULL, "path not allowed");
3806 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3807 jio_snprintf(ebuf, ebuflen,
3808 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3809 return NULL;
3810 }
3811
3812 // search system directory
3813 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3814 if (size >= pathLen) {
3815 return NULL; // truncated
3816 }
3817 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3818 return NULL; // truncated
3819 }
3820 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3821 return result;
3822 }
3823 }
3824
3825 // try Windows directory
3826 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3827 if (size >= pathLen) {
3828 return NULL; // truncated
3829 }
3830 if (jio_snprintf(path + size, pathLen - size, "\\%s", name) == -1) {
3831 return NULL; // truncated
3832 }
3833 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3834 return result;
3835 }
3836 }
3837
3838 jio_snprintf(ebuf, ebuflen,
3839 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3840 return NULL;
3841 }
3842
3843 #define MAXIMUM_THREADS_TO_KEEP (16 * MAXIMUM_WAIT_OBJECTS)
3844 #define EXIT_TIMEOUT 300000 /* 5 minutes */
3845
3846 static BOOL CALLBACK init_crit_sect_call(PINIT_ONCE, PVOID pcrit_sect, PVOID*) {
3847 InitializeCriticalSection((CRITICAL_SECTION*)pcrit_sect);
3848 return TRUE;
3849 }
3850
3851 int os::win32::exit_process_or_thread(Ept what, int exit_code) {
3852 // Basic approach:
3853 // - Each exiting thread registers its intent to exit and then does so.
3854 // - A thread trying to terminate the process must wait for all
3855 // threads currently exiting to complete their exit.
3856
3857 if (os::win32::has_exit_bug()) {
3858 // The array holds handles of the threads that have started exiting by calling
3859 // _endthreadex().
3860 // Should be large enough to avoid blocking the exiting thread due to lack of
3861 // a free slot.
3862 static HANDLE handles[MAXIMUM_THREADS_TO_KEEP];
3863 static int handle_count = 0;
3864
3865 static INIT_ONCE init_once_crit_sect = INIT_ONCE_STATIC_INIT;
3866 static CRITICAL_SECTION crit_sect;
3867 static volatile DWORD process_exiting = 0;
3868 int i, j;
3869 DWORD res;
3870 HANDLE hproc, hthr;
3871
3872 // We only attempt to register threads until a process exiting
3873 // thread manages to set the process_exiting flag. Any threads
3874 // that come through here after the process_exiting flag is set
3875 // are unregistered and will be caught in the SuspendThread()
3876 // infinite loop below.
3877 bool registered = false;
3878
3879 // The first thread that reached this point, initializes the critical section.
3880 if (!InitOnceExecuteOnce(&init_once_crit_sect, init_crit_sect_call, &crit_sect, NULL)) {
3881 warning("crit_sect initialization failed in %s: %d\n", __FILE__, __LINE__);
3882 } else if (OrderAccess::load_acquire(&process_exiting) == 0) {
3883 if (what != EPT_THREAD) {
3884 // Atomically set process_exiting before the critical section
3885 // to increase the visibility between racing threads.
3886 Atomic::cmpxchg(GetCurrentThreadId(), &process_exiting, (DWORD)0);
3887 }
3888 EnterCriticalSection(&crit_sect);
3889
3890 if (what == EPT_THREAD && OrderAccess::load_acquire(&process_exiting) == 0) {
3891 // Remove from the array those handles of the threads that have completed exiting.
3892 for (i = 0, j = 0; i < handle_count; ++i) {
3893 res = WaitForSingleObject(handles[i], 0 /* don't wait */);
3894 if (res == WAIT_TIMEOUT) {
3895 handles[j++] = handles[i];
3896 } else {
3897 if (res == WAIT_FAILED) {
3898 warning("WaitForSingleObject failed (%u) in %s: %d\n",
3899 GetLastError(), __FILE__, __LINE__);
3900 }
3901 // Don't keep the handle, if we failed waiting for it.
3902 CloseHandle(handles[i]);
3903 }
3904 }
3905
3906 // If there's no free slot in the array of the kept handles, we'll have to
3907 // wait until at least one thread completes exiting.
3908 if ((handle_count = j) == MAXIMUM_THREADS_TO_KEEP) {
3909 // Raise the priority of the oldest exiting thread to increase its chances
3910 // to complete sooner.
3911 SetThreadPriority(handles[0], THREAD_PRIORITY_ABOVE_NORMAL);
3912 res = WaitForMultipleObjects(MAXIMUM_WAIT_OBJECTS, handles, FALSE, EXIT_TIMEOUT);
3913 if (res >= WAIT_OBJECT_0 && res < (WAIT_OBJECT_0 + MAXIMUM_WAIT_OBJECTS)) {
3914 i = (res - WAIT_OBJECT_0);
3915 handle_count = MAXIMUM_THREADS_TO_KEEP - 1;
3916 for (; i < handle_count; ++i) {
3917 handles[i] = handles[i + 1];
3918 }
3919 } else {
3920 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3921 (res == WAIT_FAILED ? "failed" : "timed out"),
3922 GetLastError(), __FILE__, __LINE__);
3923 // Don't keep handles, if we failed waiting for them.
3924 for (i = 0; i < MAXIMUM_THREADS_TO_KEEP; ++i) {
3925 CloseHandle(handles[i]);
3926 }
3927 handle_count = 0;
3928 }
3929 }
3930
3931 // Store a duplicate of the current thread handle in the array of handles.
3932 hproc = GetCurrentProcess();
3933 hthr = GetCurrentThread();
3934 if (!DuplicateHandle(hproc, hthr, hproc, &handles[handle_count],
3935 0, FALSE, DUPLICATE_SAME_ACCESS)) {
3936 warning("DuplicateHandle failed (%u) in %s: %d\n",
3937 GetLastError(), __FILE__, __LINE__);
3938
3939 // We can't register this thread (no more handles) so this thread
3940 // may be racing with a thread that is calling exit(). If the thread
3941 // that is calling exit() has managed to set the process_exiting
3942 // flag, then this thread will be caught in the SuspendThread()
3943 // infinite loop below which closes that race. A small timing
3944 // window remains before the process_exiting flag is set, but it
3945 // is only exposed when we are out of handles.
3946 } else {
3947 ++handle_count;
3948 registered = true;
3949
3950 // The current exiting thread has stored its handle in the array, and now
3951 // should leave the critical section before calling _endthreadex().
3952 }
3953
3954 } else if (what != EPT_THREAD && handle_count > 0) {
3955 jlong start_time, finish_time, timeout_left;
3956 // Before ending the process, make sure all the threads that had called
3957 // _endthreadex() completed.
3958
3959 // Set the priority level of the current thread to the same value as
3960 // the priority level of exiting threads.
3961 // This is to ensure it will be given a fair chance to execute if
3962 // the timeout expires.
3963 hthr = GetCurrentThread();
3964 SetThreadPriority(hthr, THREAD_PRIORITY_ABOVE_NORMAL);
3965 start_time = os::javaTimeNanos();
3966 finish_time = start_time + ((jlong)EXIT_TIMEOUT * 1000000L);
3967 for (i = 0; ; ) {
3968 int portion_count = handle_count - i;
3969 if (portion_count > MAXIMUM_WAIT_OBJECTS) {
3970 portion_count = MAXIMUM_WAIT_OBJECTS;
3971 }
3972 for (j = 0; j < portion_count; ++j) {
3973 SetThreadPriority(handles[i + j], THREAD_PRIORITY_ABOVE_NORMAL);
3974 }
3975 timeout_left = (finish_time - start_time) / 1000000L;
3976 if (timeout_left < 0) {
3977 timeout_left = 0;
3978 }
3979 res = WaitForMultipleObjects(portion_count, handles + i, TRUE, timeout_left);
3980 if (res == WAIT_FAILED || res == WAIT_TIMEOUT) {
3981 warning("WaitForMultipleObjects %s (%u) in %s: %d\n",
3982 (res == WAIT_FAILED ? "failed" : "timed out"),
3983 GetLastError(), __FILE__, __LINE__);
3984 // Reset portion_count so we close the remaining
3985 // handles due to this error.
3986 portion_count = handle_count - i;
3987 }
3988 for (j = 0; j < portion_count; ++j) {
3989 CloseHandle(handles[i + j]);
3990 }
3991 if ((i += portion_count) >= handle_count) {
3992 break;
3993 }
3994 start_time = os::javaTimeNanos();
3995 }
3996 handle_count = 0;
3997 }
3998
3999 LeaveCriticalSection(&crit_sect);
4000 }
4001
4002 if (!registered &&
4003 OrderAccess::load_acquire(&process_exiting) != 0 &&
4004 process_exiting != GetCurrentThreadId()) {
4005 // Some other thread is about to call exit(), so we don't let
4006 // the current unregistered thread proceed to exit() or _endthreadex()
4007 while (true) {
4008 SuspendThread(GetCurrentThread());
4009 // Avoid busy-wait loop, if SuspendThread() failed.
4010 Sleep(EXIT_TIMEOUT);
4011 }
4012 }
4013 }
4014
4015 // We are here if either
4016 // - there's no 'race at exit' bug on this OS release;
4017 // - initialization of the critical section failed (unlikely);
4018 // - the current thread has registered itself and left the critical section;
4019 // - the process-exiting thread has raised the flag and left the critical section.
4020 if (what == EPT_THREAD) {
4021 _endthreadex((unsigned)exit_code);
4022 } else if (what == EPT_PROCESS) {
4023 ::exit(exit_code);
4024 } else {
4025 _exit(exit_code);
4026 }
4027
4028 // Should not reach here
4029 return exit_code;
4030 }
4031
4032 #undef EXIT_TIMEOUT
4033
4034 void os::win32::setmode_streams() {
4035 _setmode(_fileno(stdin), _O_BINARY);
4036 _setmode(_fileno(stdout), _O_BINARY);
4037 _setmode(_fileno(stderr), _O_BINARY);
4038 }
4039
4040
4041 bool os::is_debugger_attached() {
4042 return IsDebuggerPresent() ? true : false;
4043 }
4044
4045
4046 void os::wait_for_keypress_at_exit(void) {
4047 if (PauseAtExit) {
4048 fprintf(stderr, "Press any key to continue...\n");
4049 fgetc(stdin);
4050 }
4051 }
4052
4053
4054 bool os::message_box(const char* title, const char* message) {
4055 int result = MessageBox(NULL, message, title,
4056 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
4057 return result == IDYES;
4058 }
4059
4060 #ifndef PRODUCT
4061 #ifndef _WIN64
4062 // Helpers to check whether NX protection is enabled
4063 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
4064 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
4065 pex->ExceptionRecord->NumberParameters > 0 &&
4066 pex->ExceptionRecord->ExceptionInformation[0] ==
4067 EXCEPTION_INFO_EXEC_VIOLATION) {
4068 return EXCEPTION_EXECUTE_HANDLER;
4069 }
4070 return EXCEPTION_CONTINUE_SEARCH;
4071 }
4072
4073 void nx_check_protection() {
4074 // If NX is enabled we'll get an exception calling into code on the stack
4075 char code[] = { (char)0xC3 }; // ret
4076 void *code_ptr = (void *)code;
4077 __try {
4078 __asm call code_ptr
4079 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
4080 tty->print_raw_cr("NX protection detected.");
4081 }
4082 }
4083 #endif // _WIN64
4084 #endif // PRODUCT
4085
4086 // This is called _before_ the global arguments have been parsed
4087 void os::init(void) {
4088 _initial_pid = _getpid();
4089
4090 init_random(1234567);
4091
4092 win32::initialize_system_info();
4093 win32::setmode_streams();
4094 init_page_sizes((size_t) win32::vm_page_size());
4095
4096 // This may be overridden later when argument processing is done.
4097 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation, false);
4098
4099 // Initialize main_process and main_thread
4100 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
4101 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
4102 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
4103 fatal("DuplicateHandle failed\n");
4104 }
4105 main_thread_id = (int) GetCurrentThreadId();
4106
4107 // initialize fast thread access - only used for 32-bit
4108 win32::initialize_thread_ptr_offset();
4109 }
4110
4111 // To install functions for atexit processing
4112 extern "C" {
4113 static void perfMemory_exit_helper() {
4114 perfMemory_exit();
4115 }
4116 }
4117
4118 static jint initSock();
4119
4120 // this is called _after_ the global arguments have been parsed
4121 jint os::init_2(void) {
4122
4123 // This could be set any time but all platforms
4124 // have to set it the same so we have to mirror Solaris.
4125 DEBUG_ONLY(os::set_mutex_init_done();)
4126
4127 // Setup Windows Exceptions
4128
4129 #if INCLUDE_AOT
4130 // If AOT is enabled we need to install a vectored exception handler
4131 // in order to forward implicit exceptions from code in AOT
4132 // generated DLLs. This is necessary since these DLLs are not
4133 // registered for structured exceptions like codecache methods are.
4134 if (UseAOT) {
4135 topLevelVectoredExceptionHandler = AddVectoredExceptionHandler( 1, topLevelVectoredExceptionFilter);
4136 }
4137 #endif
4138
4139 // for debugging float code generation bugs
4140 if (ForceFloatExceptions) {
4141 #ifndef _WIN64
4142 static long fp_control_word = 0;
4143 __asm { fstcw fp_control_word }
4144 // see Intel PPro Manual, Vol. 2, p 7-16
4145 const long precision = 0x20;
4146 const long underflow = 0x10;
4147 const long overflow = 0x08;
4148 const long zero_div = 0x04;
4149 const long denorm = 0x02;
4150 const long invalid = 0x01;
4151 fp_control_word |= invalid;
4152 __asm { fldcw fp_control_word }
4153 #endif
4154 }
4155
4156 // If stack_commit_size is 0, windows will reserve the default size,
4157 // but only commit a small portion of it.
4158 size_t stack_commit_size = align_up(ThreadStackSize*K, os::vm_page_size());
4159 size_t default_reserve_size = os::win32::default_stack_size();
4160 size_t actual_reserve_size = stack_commit_size;
4161 if (stack_commit_size < default_reserve_size) {
4162 // If stack_commit_size == 0, we want this too
4163 actual_reserve_size = default_reserve_size;
4164 }
4165
4166 // Check minimum allowable stack size for thread creation and to initialize
4167 // the java system classes, including StackOverflowError - depends on page
4168 // size. Add two 4K pages for compiler2 recursion in main thread.
4169 // Add in 4*BytesPerWord 4K pages to account for VM stack during
4170 // class initialization depending on 32 or 64 bit VM.
4171 size_t min_stack_allowed =
4172 (size_t)(JavaThread::stack_guard_zone_size() +
4173 JavaThread::stack_shadow_zone_size() +
4174 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
4175
4176 min_stack_allowed = align_up(min_stack_allowed, os::vm_page_size());
4177
4178 if (actual_reserve_size < min_stack_allowed) {
4179 tty->print_cr("\nThe Java thread stack size specified is too small. "
4180 "Specify at least %dk",
4181 min_stack_allowed / K);
4182 return JNI_ERR;
4183 }
4184
4185 JavaThread::set_stack_size_at_create(stack_commit_size);
4186
4187 // Calculate theoretical max. size of Threads to guard gainst artifical
4188 // out-of-memory situations, where all available address-space has been
4189 // reserved by thread stacks.
4190 assert(actual_reserve_size != 0, "Must have a stack");
4191
4192 // Calculate the thread limit when we should start doing Virtual Memory
4193 // banging. Currently when the threads will have used all but 200Mb of space.
4194 //
4195 // TODO: consider performing a similar calculation for commit size instead
4196 // as reserve size, since on a 64-bit platform we'll run into that more
4197 // often than running out of virtual memory space. We can use the
4198 // lower value of the two calculations as the os_thread_limit.
4199 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4200 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4201
4202 // at exit methods are called in the reverse order of their registration.
4203 // there is no limit to the number of functions registered. atexit does
4204 // not set errno.
4205
4206 if (PerfAllowAtExitRegistration) {
4207 // only register atexit functions if PerfAllowAtExitRegistration is set.
4208 // atexit functions can be delayed until process exit time, which
4209 // can be problematic for embedded VM situations. Embedded VMs should
4210 // call DestroyJavaVM() to assure that VM resources are released.
4211
4212 // note: perfMemory_exit_helper atexit function may be removed in
4213 // the future if the appropriate cleanup code can be added to the
4214 // VM_Exit VMOperation's doit method.
4215 if (atexit(perfMemory_exit_helper) != 0) {
4216 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4217 }
4218 }
4219
4220 #ifndef _WIN64
4221 // Print something if NX is enabled (win32 on AMD64)
4222 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4223 #endif
4224
4225 // initialize thread priority policy
4226 prio_init();
4227
4228 if (UseNUMA && !ForceNUMA) {
4229 UseNUMA = false; // We don't fully support this yet
4230 }
4231
4232 if (UseNUMAInterleaving) {
4233 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4234 bool success = numa_interleaving_init();
4235 if (!success) UseNUMAInterleaving = false;
4236 }
4237
4238 if (initSock() != JNI_OK) {
4239 return JNI_ERR;
4240 }
4241
4242 SymbolEngine::recalc_search_path();
4243
4244 // Initialize data for jdk.internal.misc.Signal
4245 if (!ReduceSignalUsage) {
4246 jdk_misc_signal_init();
4247 }
4248
4249 return JNI_OK;
4250 }
4251
4252 // Mark the polling page as unreadable
4253 void os::make_polling_page_unreadable(void) {
4254 DWORD old_status;
4255 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4256 PAGE_NOACCESS, &old_status)) {
4257 fatal("Could not disable polling page");
4258 }
4259 }
4260
4261 // Mark the polling page as readable
4262 void os::make_polling_page_readable(void) {
4263 DWORD old_status;
4264 if (!VirtualProtect((char *)_polling_page, os::vm_page_size(),
4265 PAGE_READONLY, &old_status)) {
4266 fatal("Could not enable polling page");
4267 }
4268 }
4269
4270 // combine the high and low DWORD into a ULONGLONG
4271 static ULONGLONG make_double_word(DWORD high_word, DWORD low_word) {
4272 ULONGLONG value = high_word;
4273 value <<= sizeof(high_word) * 8;
4274 value |= low_word;
4275 return value;
4276 }
4277
4278 // Transfers data from WIN32_FILE_ATTRIBUTE_DATA structure to struct stat
4279 static void file_attribute_data_to_stat(struct stat* sbuf, WIN32_FILE_ATTRIBUTE_DATA file_data) {
4280 ::memset((void*)sbuf, 0, sizeof(struct stat));
4281 sbuf->st_size = (_off_t)make_double_word(file_data.nFileSizeHigh, file_data.nFileSizeLow);
4282 sbuf->st_mtime = make_double_word(file_data.ftLastWriteTime.dwHighDateTime,
4283 file_data.ftLastWriteTime.dwLowDateTime);
4284 sbuf->st_ctime = make_double_word(file_data.ftCreationTime.dwHighDateTime,
4285 file_data.ftCreationTime.dwLowDateTime);
4286 sbuf->st_atime = make_double_word(file_data.ftLastAccessTime.dwHighDateTime,
4287 file_data.ftLastAccessTime.dwLowDateTime);
4288 if ((file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
4289 sbuf->st_mode |= S_IFDIR;
4290 } else {
4291 sbuf->st_mode |= S_IFREG;
4292 }
4293 }
4294
4295 // The following function is adapted from java.base/windows/native/libjava/canonicalize_md.c
4296 // Creates an UNC path from a single byte path. Return buffer is
4297 // allocated in C heap and needs to be freed by the caller.
4298 // Returns NULL on error.
4299 static wchar_t* create_unc_path(const char* path, errno_t &err) {
4300 wchar_t* wpath = NULL;
4301 size_t converted_chars = 0;
4302 size_t path_len = strlen(path) + 1; // includes the terminating NULL
4303 if (path[0] == '\\' && path[1] == '\\') {
4304 if (path[2] == '?' && path[3] == '\\'){
4305 // if it already has a \\?\ don't do the prefix
4306 wpath = (wchar_t*)os::malloc(path_len * sizeof(wchar_t), mtInternal);
4307 if (wpath != NULL) {
4308 err = ::mbstowcs_s(&converted_chars, wpath, path_len, path, path_len);
4309 } else {
4310 err = ENOMEM;
4311 }
4312 } else {
4313 // only UNC pathname includes double slashes here
4314 wpath = (wchar_t*)os::malloc((path_len + 7) * sizeof(wchar_t), mtInternal);
4315 if (wpath != NULL) {
4316 ::wcscpy(wpath, L"\\\\?\\UNC\0");
4317 err = ::mbstowcs_s(&converted_chars, &wpath[7], path_len, path, path_len);
4318 } else {
4319 err = ENOMEM;
4320 }
4321 }
4322 } else {
4323 wpath = (wchar_t*)os::malloc((path_len + 4) * sizeof(wchar_t), mtInternal);
4324 if (wpath != NULL) {
4325 ::wcscpy(wpath, L"\\\\?\\\0");
4326 err = ::mbstowcs_s(&converted_chars, &wpath[4], path_len, path, path_len);
4327 } else {
4328 err = ENOMEM;
4329 }
4330 }
4331 return wpath;
4332 }
4333
4334 static void destroy_unc_path(wchar_t* wpath) {
4335 os::free(wpath);
4336 }
4337
4338 int os::stat(const char *path, struct stat *sbuf) {
4339 char* pathbuf = (char*)os::strdup(path, mtInternal);
4340 if (pathbuf == NULL) {
4341 errno = ENOMEM;
4342 return -1;
4343 }
4344 os::native_path(pathbuf);
4345 int ret;
4346 WIN32_FILE_ATTRIBUTE_DATA file_data;
4347 // Not using stat() to avoid the problem described in JDK-6539723
4348 if (strlen(path) < MAX_PATH) {
4349 BOOL bret = ::GetFileAttributesExA(pathbuf, GetFileExInfoStandard, &file_data);
4350 if (!bret) {
4351 errno = ::GetLastError();
4352 ret = -1;
4353 }
4354 else {
4355 file_attribute_data_to_stat(sbuf, file_data);
4356 ret = 0;
4357 }
4358 } else {
4359 errno_t err = ERROR_SUCCESS;
4360 wchar_t* wpath = create_unc_path(pathbuf, err);
4361 if (err != ERROR_SUCCESS) {
4362 if (wpath != NULL) {
4363 destroy_unc_path(wpath);
4364 }
4365 os::free(pathbuf);
4366 errno = err;
4367 return -1;
4368 }
4369 BOOL bret = ::GetFileAttributesExW(wpath, GetFileExInfoStandard, &file_data);
4370 if (!bret) {
4371 errno = ::GetLastError();
4372 ret = -1;
4373 } else {
4374 file_attribute_data_to_stat(sbuf, file_data);
4375 ret = 0;
4376 }
4377 destroy_unc_path(wpath);
4378 }
4379 os::free(pathbuf);
4380 return ret;
4381 }
4382
4383
4384 #define FT2INT64(ft) \
4385 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4386
4387
4388 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4389 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4390 // of a thread.
4391 //
4392 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4393 // the fast estimate available on the platform.
4394
4395 // current_thread_cpu_time() is not optimized for Windows yet
4396 jlong os::current_thread_cpu_time() {
4397 // return user + sys since the cost is the same
4398 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4399 }
4400
4401 jlong os::thread_cpu_time(Thread* thread) {
4402 // consistent with what current_thread_cpu_time() returns.
4403 return os::thread_cpu_time(thread, true /* user+sys */);
4404 }
4405
4406 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4407 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4408 }
4409
4410 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4411 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4412 // If this function changes, os::is_thread_cpu_time_supported() should too
4413 FILETIME CreationTime;
4414 FILETIME ExitTime;
4415 FILETIME KernelTime;
4416 FILETIME UserTime;
4417
4418 if (GetThreadTimes(thread->osthread()->thread_handle(), &CreationTime,
4419 &ExitTime, &KernelTime, &UserTime) == 0) {
4420 return -1;
4421 } else if (user_sys_cpu_time) {
4422 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4423 } else {
4424 return FT2INT64(UserTime) * 100;
4425 }
4426 }
4427
4428 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4429 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4430 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4431 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4432 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4433 }
4434
4435 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4436 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4437 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4438 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4439 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4440 }
4441
4442 bool os::is_thread_cpu_time_supported() {
4443 // see os::thread_cpu_time
4444 FILETIME CreationTime;
4445 FILETIME ExitTime;
4446 FILETIME KernelTime;
4447 FILETIME UserTime;
4448
4449 if (GetThreadTimes(GetCurrentThread(), &CreationTime, &ExitTime,
4450 &KernelTime, &UserTime) == 0) {
4451 return false;
4452 } else {
4453 return true;
4454 }
4455 }
4456
4457 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4458 // It does have primitives (PDH API) to get CPU usage and run queue length.
4459 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4460 // If we wanted to implement loadavg on Windows, we have a few options:
4461 //
4462 // a) Query CPU usage and run queue length and "fake" an answer by
4463 // returning the CPU usage if it's under 100%, and the run queue
4464 // length otherwise. It turns out that querying is pretty slow
4465 // on Windows, on the order of 200 microseconds on a fast machine.
4466 // Note that on the Windows the CPU usage value is the % usage
4467 // since the last time the API was called (and the first call
4468 // returns 100%), so we'd have to deal with that as well.
4469 //
4470 // b) Sample the "fake" answer using a sampling thread and store
4471 // the answer in a global variable. The call to loadavg would
4472 // just return the value of the global, avoiding the slow query.
4473 //
4474 // c) Sample a better answer using exponential decay to smooth the
4475 // value. This is basically the algorithm used by UNIX kernels.
4476 //
4477 // Note that sampling thread starvation could affect both (b) and (c).
4478 int os::loadavg(double loadavg[], int nelem) {
4479 return -1;
4480 }
4481
4482
4483 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4484 bool os::dont_yield() {
4485 return DontYieldALot;
4486 }
4487
4488 // This method is a slightly reworked copy of JDK's sysOpen
4489 // from src/windows/hpi/src/sys_api_md.c
4490
4491 int os::open(const char *path, int oflag, int mode) {
4492 char* pathbuf = (char*)os::strdup(path, mtInternal);
4493 if (pathbuf == NULL) {
4494 errno = ENOMEM;
4495 return -1;
4496 }
4497 os::native_path(pathbuf);
4498 int ret;
4499 if (strlen(path) < MAX_PATH) {
4500 ret = ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4501 } else {
4502 errno_t err = ERROR_SUCCESS;
4503 wchar_t* wpath = create_unc_path(pathbuf, err);
4504 if (err != ERROR_SUCCESS) {
4505 if (wpath != NULL) {
4506 destroy_unc_path(wpath);
4507 }
4508 os::free(pathbuf);
4509 errno = err;
4510 return -1;
4511 }
4512 ret = ::_wopen(wpath, oflag | O_BINARY | O_NOINHERIT, mode);
4513 if (ret == -1) {
4514 errno = ::GetLastError();
4515 }
4516 destroy_unc_path(wpath);
4517 }
4518 os::free(pathbuf);
4519 return ret;
4520 }
4521
4522 FILE* os::open(int fd, const char* mode) {
4523 return ::_fdopen(fd, mode);
4524 }
4525
4526 // Is a (classpath) directory empty?
4527 bool os::dir_is_empty(const char* path) {
4528 char* search_path = (char*)os::malloc(strlen(path) + 3, mtInternal);
4529 if (search_path == NULL) {
4530 errno = ENOMEM;
4531 return false;
4532 }
4533 strcpy(search_path, path);
4534 os::native_path(search_path);
4535 // Append "*", or possibly "\\*", to path
4536 if (search_path[1] == ':' &&
4537 (search_path[2] == '\0' ||
4538 (search_path[2] == '\\' && search_path[3] == '\0'))) {
4539 // No '\\' needed for cases like "Z:" or "Z:\"
4540 strcat(search_path, "*");
4541 }
4542 else {
4543 strcat(search_path, "\\*");
4544 }
4545 errno_t err = ERROR_SUCCESS;
4546 wchar_t* wpath = create_unc_path(search_path, err);
4547 if (err != ERROR_SUCCESS) {
4548 if (wpath != NULL) {
4549 destroy_unc_path(wpath);
4550 }
4551 os::free(search_path);
4552 errno = err;
4553 return false;
4554 }
4555 WIN32_FIND_DATAW fd;
4556 HANDLE f = ::FindFirstFileW(wpath, &fd);
4557 destroy_unc_path(wpath);
4558 bool is_empty = true;
4559 if (f != INVALID_HANDLE_VALUE) {
4560 while (is_empty && ::FindNextFileW(f, &fd)) {
4561 // An empty directory contains only the current directory file
4562 // and the previous directory file.
4563 if ((wcscmp(fd.cFileName, L".") != 0) &&
4564 (wcscmp(fd.cFileName, L"..") != 0)) {
4565 is_empty = false;
4566 }
4567 }
4568 FindClose(f);
4569 }
4570 os::free(search_path);
4571 return is_empty;
4572 }
4573
4574 // create binary file, rewriting existing file if required
4575 int os::create_binary_file(const char* path, bool rewrite_existing) {
4576 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4577 if (!rewrite_existing) {
4578 oflags |= _O_EXCL;
4579 }
4580 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4581 }
4582
4583 // return current position of file pointer
4584 jlong os::current_file_offset(int fd) {
4585 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4586 }
4587
4588 // move file pointer to the specified offset
4589 jlong os::seek_to_file_offset(int fd, jlong offset) {
4590 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4591 }
4592
4593
4594 jlong os::lseek(int fd, jlong offset, int whence) {
4595 return (jlong) ::_lseeki64(fd, offset, whence);
4596 }
4597
4598 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
4599 OVERLAPPED ov;
4600 DWORD nread;
4601 BOOL result;
4602
4603 ZeroMemory(&ov, sizeof(ov));
4604 ov.Offset = (DWORD)offset;
4605 ov.OffsetHigh = (DWORD)(offset >> 32);
4606
4607 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4608
4609 result = ReadFile(h, (LPVOID)buf, nBytes, &nread, &ov);
4610
4611 return result ? nread : 0;
4612 }
4613
4614
4615 // This method is a slightly reworked copy of JDK's sysNativePath
4616 // from src/windows/hpi/src/path_md.c
4617
4618 // Convert a pathname to native format. On win32, this involves forcing all
4619 // separators to be '\\' rather than '/' (both are legal inputs, but Win95
4620 // sometimes rejects '/') and removing redundant separators. The input path is
4621 // assumed to have been converted into the character encoding used by the local
4622 // system. Because this might be a double-byte encoding, care is taken to
4623 // treat double-byte lead characters correctly.
4624 //
4625 // This procedure modifies the given path in place, as the result is never
4626 // longer than the original. There is no error return; this operation always
4627 // succeeds.
4628 char * os::native_path(char *path) {
4629 char *src = path, *dst = path, *end = path;
4630 char *colon = NULL; // If a drive specifier is found, this will
4631 // point to the colon following the drive letter
4632
4633 // Assumption: '/', '\\', ':', and drive letters are never lead bytes
4634 assert(((!::IsDBCSLeadByte('/')) && (!::IsDBCSLeadByte('\\'))
4635 && (!::IsDBCSLeadByte(':'))), "Illegal lead byte");
4636
4637 // Check for leading separators
4638 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4639 while (isfilesep(*src)) {
4640 src++;
4641 }
4642
4643 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4644 // Remove leading separators if followed by drive specifier. This
4645 // hack is necessary to support file URLs containing drive
4646 // specifiers (e.g., "file://c:/path"). As a side effect,
4647 // "/c:/path" can be used as an alternative to "c:/path".
4648 *dst++ = *src++;
4649 colon = dst;
4650 *dst++ = ':';
4651 src++;
4652 } else {
4653 src = path;
4654 if (isfilesep(src[0]) && isfilesep(src[1])) {
4655 // UNC pathname: Retain first separator; leave src pointed at
4656 // second separator so that further separators will be collapsed
4657 // into the second separator. The result will be a pathname
4658 // beginning with "\\\\" followed (most likely) by a host name.
4659 src = dst = path + 1;
4660 path[0] = '\\'; // Force first separator to '\\'
4661 }
4662 }
4663
4664 end = dst;
4665
4666 // Remove redundant separators from remainder of path, forcing all
4667 // separators to be '\\' rather than '/'. Also, single byte space
4668 // characters are removed from the end of the path because those
4669 // are not legal ending characters on this operating system.
4670 //
4671 while (*src != '\0') {
4672 if (isfilesep(*src)) {
4673 *dst++ = '\\'; src++;
4674 while (isfilesep(*src)) src++;
4675 if (*src == '\0') {
4676 // Check for trailing separator
4677 end = dst;
4678 if (colon == dst - 2) break; // "z:\\"
4679 if (dst == path + 1) break; // "\\"
4680 if (dst == path + 2 && isfilesep(path[0])) {
4681 // "\\\\" is not collapsed to "\\" because "\\\\" marks the
4682 // beginning of a UNC pathname. Even though it is not, by
4683 // itself, a valid UNC pathname, we leave it as is in order
4684 // to be consistent with the path canonicalizer as well
4685 // as the win32 APIs, which treat this case as an invalid
4686 // UNC pathname rather than as an alias for the root
4687 // directory of the current drive.
4688 break;
4689 }
4690 end = --dst; // Path does not denote a root directory, so
4691 // remove trailing separator
4692 break;
4693 }
4694 end = dst;
4695 } else {
4696 if (::IsDBCSLeadByte(*src)) { // Copy a double-byte character
4697 *dst++ = *src++;
4698 if (*src) *dst++ = *src++;
4699 end = dst;
4700 } else { // Copy a single-byte character
4701 char c = *src++;
4702 *dst++ = c;
4703 // Space is not a legal ending character
4704 if (c != ' ') end = dst;
4705 }
4706 }
4707 }
4708
4709 *end = '\0';
4710
4711 // For "z:", add "." to work around a bug in the C runtime library
4712 if (colon == dst - 1) {
4713 path[2] = '.';
4714 path[3] = '\0';
4715 }
4716
4717 return path;
4718 }
4719
4720 // This code is a copy of JDK's sysSetLength
4721 // from src/windows/hpi/src/sys_api_md.c
4722
4723 int os::ftruncate(int fd, jlong length) {
4724 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4725 long high = (long)(length >> 32);
4726 DWORD ret;
4727
4728 if (h == (HANDLE)(-1)) {
4729 return -1;
4730 }
4731
4732 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4733 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4734 return -1;
4735 }
4736
4737 if (::SetEndOfFile(h) == FALSE) {
4738 return -1;
4739 }
4740
4741 return 0;
4742 }
4743
4744 int os::get_fileno(FILE* fp) {
4745 return _fileno(fp);
4746 }
4747
4748 // This code is a copy of JDK's sysSync
4749 // from src/windows/hpi/src/sys_api_md.c
4750 // except for the legacy workaround for a bug in Win 98
4751
4752 int os::fsync(int fd) {
4753 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4754
4755 if ((!::FlushFileBuffers(handle)) &&
4756 (GetLastError() != ERROR_ACCESS_DENIED)) {
4757 // from winerror.h
4758 return -1;
4759 }
4760 return 0;
4761 }
4762
4763 static int nonSeekAvailable(int, long *);
4764 static int stdinAvailable(int, long *);
4765
4766 // This code is a copy of JDK's sysAvailable
4767 // from src/windows/hpi/src/sys_api_md.c
4768
4769 int os::available(int fd, jlong *bytes) {
4770 jlong cur, end;
4771 struct _stati64 stbuf64;
4772
4773 if (::_fstati64(fd, &stbuf64) >= 0) {
4774 int mode = stbuf64.st_mode;
4775 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4776 int ret;
4777 long lpbytes;
4778 if (fd == 0) {
4779 ret = stdinAvailable(fd, &lpbytes);
4780 } else {
4781 ret = nonSeekAvailable(fd, &lpbytes);
4782 }
4783 (*bytes) = (jlong)(lpbytes);
4784 return ret;
4785 }
4786 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4787 return FALSE;
4788 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4789 return FALSE;
4790 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4791 return FALSE;
4792 }
4793 *bytes = end - cur;
4794 return TRUE;
4795 } else {
4796 return FALSE;
4797 }
4798 }
4799
4800 void os::flockfile(FILE* fp) {
4801 _lock_file(fp);
4802 }
4803
4804 void os::funlockfile(FILE* fp) {
4805 _unlock_file(fp);
4806 }
4807
4808 // This code is a copy of JDK's nonSeekAvailable
4809 // from src/windows/hpi/src/sys_api_md.c
4810
4811 static int nonSeekAvailable(int fd, long *pbytes) {
4812 // This is used for available on non-seekable devices
4813 // (like both named and anonymous pipes, such as pipes
4814 // connected to an exec'd process).
4815 // Standard Input is a special case.
4816 HANDLE han;
4817
4818 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4819 return FALSE;
4820 }
4821
4822 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4823 // PeekNamedPipe fails when at EOF. In that case we
4824 // simply make *pbytes = 0 which is consistent with the
4825 // behavior we get on Solaris when an fd is at EOF.
4826 // The only alternative is to raise an Exception,
4827 // which isn't really warranted.
4828 //
4829 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4830 return FALSE;
4831 }
4832 *pbytes = 0;
4833 }
4834 return TRUE;
4835 }
4836
4837 #define MAX_INPUT_EVENTS 2000
4838
4839 // This code is a copy of JDK's stdinAvailable
4840 // from src/windows/hpi/src/sys_api_md.c
4841
4842 static int stdinAvailable(int fd, long *pbytes) {
4843 HANDLE han;
4844 DWORD numEventsRead = 0; // Number of events read from buffer
4845 DWORD numEvents = 0; // Number of events in buffer
4846 DWORD i = 0; // Loop index
4847 DWORD curLength = 0; // Position marker
4848 DWORD actualLength = 0; // Number of bytes readable
4849 BOOL error = FALSE; // Error holder
4850 INPUT_RECORD *lpBuffer; // Pointer to records of input events
4851
4852 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4853 return FALSE;
4854 }
4855
4856 // Construct an array of input records in the console buffer
4857 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4858 if (error == 0) {
4859 return nonSeekAvailable(fd, pbytes);
4860 }
4861
4862 // lpBuffer must fit into 64K or else PeekConsoleInput fails
4863 if (numEvents > MAX_INPUT_EVENTS) {
4864 numEvents = MAX_INPUT_EVENTS;
4865 }
4866
4867 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4868 if (lpBuffer == NULL) {
4869 return FALSE;
4870 }
4871
4872 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4873 if (error == 0) {
4874 os::free(lpBuffer);
4875 return FALSE;
4876 }
4877
4878 // Examine input records for the number of bytes available
4879 for (i=0; i<numEvents; i++) {
4880 if (lpBuffer[i].EventType == KEY_EVENT) {
4881
4882 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4883 &(lpBuffer[i].Event);
4884 if (keyRecord->bKeyDown == TRUE) {
4885 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4886 curLength++;
4887 if (*keyPressed == '\r') {
4888 actualLength = curLength;
4889 }
4890 }
4891 }
4892 }
4893
4894 if (lpBuffer != NULL) {
4895 os::free(lpBuffer);
4896 }
4897
4898 *pbytes = (long) actualLength;
4899 return TRUE;
4900 }
4901
4902 // Map a block of memory.
4903 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4904 char *addr, size_t bytes, bool read_only,
4905 bool allow_exec) {
4906 HANDLE hFile;
4907 char* base;
4908
4909 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4910 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4911 if (hFile == NULL) {
4912 log_info(os)("CreateFile() failed: GetLastError->%ld.", GetLastError());
4913 return NULL;
4914 }
4915
4916 if (allow_exec) {
4917 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4918 // unless it comes from a PE image (which the shared archive is not.)
4919 // Even VirtualProtect refuses to give execute access to mapped memory
4920 // that was not previously executable.
4921 //
4922 // Instead, stick the executable region in anonymous memory. Yuck.
4923 // Penalty is that ~4 pages will not be shareable - in the future
4924 // we might consider DLLizing the shared archive with a proper PE
4925 // header so that mapping executable + sharing is possible.
4926
4927 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4928 PAGE_READWRITE);
4929 if (base == NULL) {
4930 log_info(os)("VirtualAlloc() failed: GetLastError->%ld.", GetLastError());
4931 CloseHandle(hFile);
4932 return NULL;
4933 }
4934
4935 DWORD bytes_read;
4936 OVERLAPPED overlapped;
4937 overlapped.Offset = (DWORD)file_offset;
4938 overlapped.OffsetHigh = 0;
4939 overlapped.hEvent = NULL;
4940 // ReadFile guarantees that if the return value is true, the requested
4941 // number of bytes were read before returning.
4942 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4943 if (!res) {
4944 log_info(os)("ReadFile() failed: GetLastError->%ld.", GetLastError());
4945 release_memory(base, bytes);
4946 CloseHandle(hFile);
4947 return NULL;
4948 }
4949 } else {
4950 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4951 NULL /* file_name */);
4952 if (hMap == NULL) {
4953 log_info(os)("CreateFileMapping() failed: GetLastError->%ld.", GetLastError());
4954 CloseHandle(hFile);
4955 return NULL;
4956 }
4957
4958 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4959 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4960 (DWORD)bytes, addr);
4961 if (base == NULL) {
4962 log_info(os)("MapViewOfFileEx() failed: GetLastError->%ld.", GetLastError());
4963 CloseHandle(hMap);
4964 CloseHandle(hFile);
4965 return NULL;
4966 }
4967
4968 if (CloseHandle(hMap) == 0) {
4969 log_info(os)("CloseHandle(hMap) failed: GetLastError->%ld.", GetLastError());
4970 CloseHandle(hFile);
4971 return base;
4972 }
4973 }
4974
4975 if (allow_exec) {
4976 DWORD old_protect;
4977 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4978 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4979
4980 if (!res) {
4981 log_info(os)("VirtualProtect() failed: GetLastError->%ld.", GetLastError());
4982 // Don't consider this a hard error, on IA32 even if the
4983 // VirtualProtect fails, we should still be able to execute
4984 CloseHandle(hFile);
4985 return base;
4986 }
4987 }
4988
4989 if (CloseHandle(hFile) == 0) {
4990 log_info(os)("CloseHandle(hFile) failed: GetLastError->%ld.", GetLastError());
4991 return base;
4992 }
4993
4994 return base;
4995 }
4996
4997
4998 // Remap a block of memory.
4999 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5000 char *addr, size_t bytes, bool read_only,
5001 bool allow_exec) {
5002 // This OS does not allow existing memory maps to be remapped so we
5003 // have to unmap the memory before we remap it.
5004 if (!os::unmap_memory(addr, bytes)) {
5005 return NULL;
5006 }
5007
5008 // There is a very small theoretical window between the unmap_memory()
5009 // call above and the map_memory() call below where a thread in native
5010 // code may be able to access an address that is no longer mapped.
5011
5012 return os::map_memory(fd, file_name, file_offset, addr, bytes,
5013 read_only, allow_exec);
5014 }
5015
5016
5017 // Unmap a block of memory.
5018 // Returns true=success, otherwise false.
5019
5020 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5021 MEMORY_BASIC_INFORMATION mem_info;
5022 if (VirtualQuery(addr, &mem_info, sizeof(mem_info)) == 0) {
5023 log_info(os)("VirtualQuery() failed: GetLastError->%ld.", GetLastError());
5024 return false;
5025 }
5026
5027 // Executable memory was not mapped using CreateFileMapping/MapViewOfFileEx.
5028 // Instead, executable region was allocated using VirtualAlloc(). See
5029 // pd_map_memory() above.
5030 //
5031 // The following flags should match the 'exec_access' flages used for
5032 // VirtualProtect() in pd_map_memory().
5033 if (mem_info.Protect == PAGE_EXECUTE_READ ||
5034 mem_info.Protect == PAGE_EXECUTE_READWRITE) {
5035 return pd_release_memory(addr, bytes);
5036 }
5037
5038 BOOL result = UnmapViewOfFile(addr);
5039 if (result == 0) {
5040 log_info(os)("UnmapViewOfFile() failed: GetLastError->%ld.", GetLastError());
5041 return false;
5042 }
5043 return true;
5044 }
5045
5046 void os::pause() {
5047 char filename[MAX_PATH];
5048 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5049 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5050 } else {
5051 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5052 }
5053
5054 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5055 if (fd != -1) {
5056 struct stat buf;
5057 ::close(fd);
5058 while (::stat(filename, &buf) == 0) {
5059 Sleep(100);
5060 }
5061 } else {
5062 jio_fprintf(stderr,
5063 "Could not open pause file '%s', continuing immediately.\n", filename);
5064 }
5065 }
5066
5067 Thread* os::ThreadCrashProtection::_protected_thread = NULL;
5068 os::ThreadCrashProtection* os::ThreadCrashProtection::_crash_protection = NULL;
5069 volatile intptr_t os::ThreadCrashProtection::_crash_mux = 0;
5070
5071 os::ThreadCrashProtection::ThreadCrashProtection() {
5072 }
5073
5074 // See the caveats for this class in os_windows.hpp
5075 // Protects the callback call so that raised OS EXCEPTIONS causes a jump back
5076 // into this method and returns false. If no OS EXCEPTION was raised, returns
5077 // true.
5078 // The callback is supposed to provide the method that should be protected.
5079 //
5080 bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
5081
5082 Thread::muxAcquire(&_crash_mux, "CrashProtection");
5083
5084 _protected_thread = Thread::current_or_null();
5085 assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
5086
5087 bool success = true;
5088 __try {
5089 _crash_protection = this;
5090 cb.call();
5091 } __except(EXCEPTION_EXECUTE_HANDLER) {
5092 // only for protection, nothing to do
5093 success = false;
5094 }
5095 _crash_protection = NULL;
5096 _protected_thread = NULL;
5097 Thread::muxRelease(&_crash_mux);
5098 return success;
5099 }
5100
5101 // An Event wraps a win32 "CreateEvent" kernel handle.
5102 //
5103 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
5104 //
5105 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
5106 // field, and call CloseHandle() on the win32 event handle. Unpark() would
5107 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
5108 // In addition, an unpark() operation might fetch the handle field, but the
5109 // event could recycle between the fetch and the SetEvent() operation.
5110 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
5111 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
5112 // on an stale but recycled handle would be harmless, but in practice this might
5113 // confuse other non-Sun code, so it's not a viable approach.
5114 //
5115 // 2: Once a win32 event handle is associated with an Event, it remains associated
5116 // with the Event. The event handle is never closed. This could be construed
5117 // as handle leakage, but only up to the maximum # of threads that have been extant
5118 // at any one time. This shouldn't be an issue, as windows platforms typically
5119 // permit a process to have hundreds of thousands of open handles.
5120 //
5121 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
5122 // and release unused handles.
5123 //
5124 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
5125 // It's not clear, however, that we wouldn't be trading one type of leak for another.
5126 //
5127 // 5. Use an RCU-like mechanism (Read-Copy Update).
5128 // Or perhaps something similar to Maged Michael's "Hazard pointers".
5129 //
5130 // We use (2).
5131 //
5132 // TODO-FIXME:
5133 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
5134 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
5135 // to recover from (or at least detect) the dreaded Windows 841176 bug.
5136 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
5137 // into a single win32 CreateEvent() handle.
5138 //
5139 // Assumption:
5140 // Only one parker can exist on an event, which is why we allocate
5141 // them per-thread. Multiple unparkers can coexist.
5142 //
5143 // _Event transitions in park()
5144 // -1 => -1 : illegal
5145 // 1 => 0 : pass - return immediately
5146 // 0 => -1 : block; then set _Event to 0 before returning
5147 //
5148 // _Event transitions in unpark()
5149 // 0 => 1 : just return
5150 // 1 => 1 : just return
5151 // -1 => either 0 or 1; must signal target thread
5152 // That is, we can safely transition _Event from -1 to either
5153 // 0 or 1.
5154 //
5155 // _Event serves as a restricted-range semaphore.
5156 // -1 : thread is blocked, i.e. there is a waiter
5157 // 0 : neutral: thread is running or ready,
5158 // could have been signaled after a wait started
5159 // 1 : signaled - thread is running or ready
5160 //
5161 // Another possible encoding of _Event would be with
5162 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5163 //
5164
5165 int os::PlatformEvent::park(jlong Millis) {
5166 // Transitions for _Event:
5167 // -1 => -1 : illegal
5168 // 1 => 0 : pass - return immediately
5169 // 0 => -1 : block; then set _Event to 0 before returning
5170
5171 guarantee(_ParkHandle != NULL , "Invariant");
5172 guarantee(Millis > 0 , "Invariant");
5173
5174 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
5175 // the initial park() operation.
5176 // Consider: use atomic decrement instead of CAS-loop
5177
5178 int v;
5179 for (;;) {
5180 v = _Event;
5181 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5182 }
5183 guarantee((v == 0) || (v == 1), "invariant");
5184 if (v != 0) return OS_OK;
5185
5186 // Do this the hard way by blocking ...
5187 // TODO: consider a brief spin here, gated on the success of recent
5188 // spin attempts by this thread.
5189 //
5190 // We decompose long timeouts into series of shorter timed waits.
5191 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
5192 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
5193 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
5194 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
5195 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
5196 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
5197 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
5198 // for the already waited time. This policy does not admit any new outcomes.
5199 // In the future, however, we might want to track the accumulated wait time and
5200 // adjust Millis accordingly if we encounter a spurious wakeup.
5201
5202 const int MAXTIMEOUT = 0x10000000;
5203 DWORD rv = WAIT_TIMEOUT;
5204 while (_Event < 0 && Millis > 0) {
5205 DWORD prd = Millis; // set prd = MAX (Millis, MAXTIMEOUT)
5206 if (Millis > MAXTIMEOUT) {
5207 prd = MAXTIMEOUT;
5208 }
5209 rv = ::WaitForSingleObject(_ParkHandle, prd);
5210 assert(rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed");
5211 if (rv == WAIT_TIMEOUT) {
5212 Millis -= prd;
5213 }
5214 }
5215 v = _Event;
5216 _Event = 0;
5217 // see comment at end of os::PlatformEvent::park() below:
5218 OrderAccess::fence();
5219 // If we encounter a nearly simultanous timeout expiry and unpark()
5220 // we return OS_OK indicating we awoke via unpark().
5221 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
5222 return (v >= 0) ? OS_OK : OS_TIMEOUT;
5223 }
5224
5225 void os::PlatformEvent::park() {
5226 // Transitions for _Event:
5227 // -1 => -1 : illegal
5228 // 1 => 0 : pass - return immediately
5229 // 0 => -1 : block; then set _Event to 0 before returning
5230
5231 guarantee(_ParkHandle != NULL, "Invariant");
5232 // Invariant: Only the thread associated with the Event/PlatformEvent
5233 // may call park().
5234 // Consider: use atomic decrement instead of CAS-loop
5235 int v;
5236 for (;;) {
5237 v = _Event;
5238 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5239 }
5240 guarantee((v == 0) || (v == 1), "invariant");
5241 if (v != 0) return;
5242
5243 // Do this the hard way by blocking ...
5244 // TODO: consider a brief spin here, gated on the success of recent
5245 // spin attempts by this thread.
5246 while (_Event < 0) {
5247 DWORD rv = ::WaitForSingleObject(_ParkHandle, INFINITE);
5248 assert(rv == WAIT_OBJECT_0, "WaitForSingleObject failed");
5249 }
5250
5251 // Usually we'll find _Event == 0 at this point, but as
5252 // an optional optimization we clear it, just in case can
5253 // multiple unpark() operations drove _Event up to 1.
5254 _Event = 0;
5255 OrderAccess::fence();
5256 guarantee(_Event >= 0, "invariant");
5257 }
5258
5259 void os::PlatformEvent::unpark() {
5260 guarantee(_ParkHandle != NULL, "Invariant");
5261
5262 // Transitions for _Event:
5263 // 0 => 1 : just return
5264 // 1 => 1 : just return
5265 // -1 => either 0 or 1; must signal target thread
5266 // That is, we can safely transition _Event from -1 to either
5267 // 0 or 1.
5268 // See also: "Semaphores in Plan 9" by Mullender & Cox
5269 //
5270 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5271 // that it will take two back-to-back park() calls for the owning
5272 // thread to block. This has the benefit of forcing a spurious return
5273 // from the first park() call after an unpark() call which will help
5274 // shake out uses of park() and unpark() without condition variables.
5275
5276 if (Atomic::xchg(1, &_Event) >= 0) return;
5277
5278 ::SetEvent(_ParkHandle);
5279 }
5280
5281
5282 // JSR166
5283 // -------------------------------------------------------
5284
5285 // The Windows implementation of Park is very straightforward: Basic
5286 // operations on Win32 Events turn out to have the right semantics to
5287 // use them directly. We opportunistically resuse the event inherited
5288 // from Monitor.
5289
5290 void Parker::park(bool isAbsolute, jlong time) {
5291 guarantee(_ParkEvent != NULL, "invariant");
5292 // First, demultiplex/decode time arguments
5293 if (time < 0) { // don't wait
5294 return;
5295 } else if (time == 0 && !isAbsolute) {
5296 time = INFINITE;
5297 } else if (isAbsolute) {
5298 time -= os::javaTimeMillis(); // convert to relative time
5299 if (time <= 0) { // already elapsed
5300 return;
5301 }
5302 } else { // relative
5303 time /= 1000000; // Must coarsen from nanos to millis
5304 if (time == 0) { // Wait for the minimal time unit if zero
5305 time = 1;
5306 }
5307 }
5308
5309 JavaThread* thread = JavaThread::current();
5310
5311 // Don't wait if interrupted or already triggered
5312 if (Thread::is_interrupted(thread, false) ||
5313 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
5314 ResetEvent(_ParkEvent);
5315 return;
5316 } else {
5317 ThreadBlockInVM tbivm(thread);
5318 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5319 thread->set_suspend_equivalent();
5320
5321 WaitForSingleObject(_ParkEvent, time);
5322 ResetEvent(_ParkEvent);
5323
5324 // If externally suspended while waiting, re-suspend
5325 if (thread->handle_special_suspend_equivalent_condition()) {
5326 thread->java_suspend_self();
5327 }
5328 }
5329 }
5330
5331 void Parker::unpark() {
5332 guarantee(_ParkEvent != NULL, "invariant");
5333 SetEvent(_ParkEvent);
5334 }
5335
5336 // Platform Monitor implementation
5337
5338 // Must already be locked
5339 int os::PlatformMonitor::wait(jlong millis) {
5340 assert(millis >= 0, "negative timeout");
5341 int ret = OS_TIMEOUT;
5342 int status = SleepConditionVariableCS(&_cond, &_mutex,
5343 millis == 0 ? INFINITE : millis);
5344 if (status != 0) {
5345 ret = OS_OK;
5346 }
5347 #ifndef PRODUCT
5348 else {
5349 DWORD err = GetLastError();
5350 assert(err == ERROR_TIMEOUT, "SleepConditionVariableCS: %ld:", err);
5351 }
5352 #endif
5353 return ret;
5354 }
5355
5356 // Run the specified command in a separate process. Return its exit value,
5357 // or -1 on failure (e.g. can't create a new process).
5358 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5359 STARTUPINFO si;
5360 PROCESS_INFORMATION pi;
5361 DWORD exit_code;
5362
5363 char * cmd_string;
5364 char * cmd_prefix = "cmd /C ";
5365 size_t len = strlen(cmd) + strlen(cmd_prefix) + 1;
5366 cmd_string = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtInternal);
5367 if (cmd_string == NULL) {
5368 return -1;
5369 }
5370 cmd_string[0] = '\0';
5371 strcat(cmd_string, cmd_prefix);
5372 strcat(cmd_string, cmd);
5373
5374 // now replace all '\n' with '&'
5375 char * substring = cmd_string;
5376 while ((substring = strchr(substring, '\n')) != NULL) {
5377 substring[0] = '&';
5378 substring++;
5379 }
5380 memset(&si, 0, sizeof(si));
5381 si.cb = sizeof(si);
5382 memset(&pi, 0, sizeof(pi));
5383 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5384 cmd_string, // command line
5385 NULL, // process security attribute
5386 NULL, // thread security attribute
5387 TRUE, // inherits system handles
5388 0, // no creation flags
5389 NULL, // use parent's environment block
5390 NULL, // use parent's starting directory
5391 &si, // (in) startup information
5392 &pi); // (out) process information
5393
5394 if (rslt) {
5395 // Wait until child process exits.
5396 WaitForSingleObject(pi.hProcess, INFINITE);
5397
5398 GetExitCodeProcess(pi.hProcess, &exit_code);
5399
5400 // Close process and thread handles.
5401 CloseHandle(pi.hProcess);
5402 CloseHandle(pi.hThread);
5403 } else {
5404 exit_code = -1;
5405 }
5406
5407 FREE_C_HEAP_ARRAY(char, cmd_string);
5408 return (int)exit_code;
5409 }
5410
5411 bool os::find(address addr, outputStream* st) {
5412 int offset = -1;
5413 bool result = false;
5414 char buf[256];
5415 if (os::dll_address_to_library_name(addr, buf, sizeof(buf), &offset)) {
5416 st->print(PTR_FORMAT " ", addr);
5417 if (strlen(buf) < sizeof(buf) - 1) {
5418 char* p = strrchr(buf, '\\');
5419 if (p) {
5420 st->print("%s", p + 1);
5421 } else {
5422 st->print("%s", buf);
5423 }
5424 } else {
5425 // The library name is probably truncated. Let's omit the library name.
5426 // See also JDK-8147512.
5427 }
5428 if (os::dll_address_to_function_name(addr, buf, sizeof(buf), &offset)) {
5429 st->print("::%s + 0x%x", buf, offset);
5430 }
5431 st->cr();
5432 result = true;
5433 }
5434 return result;
5435 }
5436
5437 static jint initSock() {
5438 WSADATA wsadata;
5439
5440 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5441 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5442 ::GetLastError());
5443 return JNI_ERR;
5444 }
5445 return JNI_OK;
5446 }
5447
5448 struct hostent* os::get_host_by_name(char* name) {
5449 return (struct hostent*)gethostbyname(name);
5450 }
5451
5452 int os::socket_close(int fd) {
5453 return ::closesocket(fd);
5454 }
5455
5456 int os::socket(int domain, int type, int protocol) {
5457 return ::socket(domain, type, protocol);
5458 }
5459
5460 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5461 return ::connect(fd, him, len);
5462 }
5463
5464 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5465 return ::recv(fd, buf, (int)nBytes, flags);
5466 }
5467
5468 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5469 return ::send(fd, buf, (int)nBytes, flags);
5470 }
5471
5472 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5473 return ::send(fd, buf, (int)nBytes, flags);
5474 }
5475
5476 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5477 #if defined(IA32)
5478 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5479 #elif defined (AMD64)
5480 #define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5481 #endif
5482
5483 // returns true if thread could be suspended,
5484 // false otherwise
5485 static bool do_suspend(HANDLE* h) {
5486 if (h != NULL) {
5487 if (SuspendThread(*h) != ~0) {
5488 return true;
5489 }
5490 }
5491 return false;
5492 }
5493
5494 // resume the thread
5495 // calling resume on an active thread is a no-op
5496 static void do_resume(HANDLE* h) {
5497 if (h != NULL) {
5498 ResumeThread(*h);
5499 }
5500 }
5501
5502 // retrieve a suspend/resume context capable handle
5503 // from the tid. Caller validates handle return value.
5504 void get_thread_handle_for_extended_context(HANDLE* h,
5505 OSThread::thread_id_t tid) {
5506 if (h != NULL) {
5507 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5508 }
5509 }
5510
5511 // Thread sampling implementation
5512 //
5513 void os::SuspendedThreadTask::internal_do_task() {
5514 CONTEXT ctxt;
5515 HANDLE h = NULL;
5516
5517 // get context capable handle for thread
5518 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5519
5520 // sanity
5521 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5522 return;
5523 }
5524
5525 // suspend the thread
5526 if (do_suspend(&h)) {
5527 ctxt.ContextFlags = sampling_context_flags;
5528 // get thread context
5529 GetThreadContext(h, &ctxt);
5530 SuspendedThreadTaskContext context(_thread, &ctxt);
5531 // pass context to Thread Sampling impl
5532 do_task(context);
5533 // resume thread
5534 do_resume(&h);
5535 }
5536
5537 // close handle
5538 CloseHandle(h);
5539 }
5540
5541 bool os::start_debugging(char *buf, int buflen) {
5542 int len = (int)strlen(buf);
5543 char *p = &buf[len];
5544
5545 jio_snprintf(p, buflen-len,
5546 "\n\n"
5547 "Do you want to debug the problem?\n\n"
5548 "To debug, attach Visual Studio to process %d; then switch to thread 0x%x\n"
5549 "Select 'Yes' to launch Visual Studio automatically (PATH must include msdev)\n"
5550 "Otherwise, select 'No' to abort...",
5551 os::current_process_id(), os::current_thread_id());
5552
5553 bool yes = os::message_box("Unexpected Error", buf);
5554
5555 if (yes) {
5556 // os::breakpoint() calls DebugBreak(), which causes a breakpoint
5557 // exception. If VM is running inside a debugger, the debugger will
5558 // catch the exception. Otherwise, the breakpoint exception will reach
5559 // the default windows exception handler, which can spawn a debugger and
5560 // automatically attach to the dying VM.
5561 os::breakpoint();
5562 yes = false;
5563 }
5564 return yes;
5565 }
5566
5567 void* os::get_default_process_handle() {
5568 return (void*)GetModuleHandle(NULL);
5569 }
5570
5571 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5572 // which is used to find statically linked in agents.
5573 // Additionally for windows, takes into account __stdcall names.
5574 // Parameters:
5575 // sym_name: Symbol in library we are looking for
5576 // lib_name: Name of library to look in, NULL for shared libs.
5577 // is_absolute_path == true if lib_name is absolute path to agent
5578 // such as "C:/a/b/L.dll"
5579 // == false if only the base name of the library is passed in
5580 // such as "L"
5581 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5582 bool is_absolute_path) {
5583 char *agent_entry_name;
5584 size_t len;
5585 size_t name_len;
5586 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5587 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5588 const char *start;
5589
5590 if (lib_name != NULL) {
5591 len = name_len = strlen(lib_name);
5592 if (is_absolute_path) {
5593 // Need to strip path, prefix and suffix
5594 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5595 lib_name = ++start;
5596 } else {
5597 // Need to check for drive prefix
5598 if ((start = strchr(lib_name, ':')) != NULL) {
5599 lib_name = ++start;
5600 }
5601 }
5602 if (len <= (prefix_len + suffix_len)) {
5603 return NULL;
5604 }
5605 lib_name += prefix_len;
5606 name_len = strlen(lib_name) - suffix_len;
5607 }
5608 }
5609 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5610 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5611 if (agent_entry_name == NULL) {
5612 return NULL;
5613 }
5614 if (lib_name != NULL) {
5615 const char *p = strrchr(sym_name, '@');
5616 if (p != NULL && p != sym_name) {
5617 // sym_name == _Agent_OnLoad@XX
5618 strncpy(agent_entry_name, sym_name, (p - sym_name));
5619 agent_entry_name[(p-sym_name)] = '\0';
5620 // agent_entry_name == _Agent_OnLoad
5621 strcat(agent_entry_name, "_");
5622 strncat(agent_entry_name, lib_name, name_len);
5623 strcat(agent_entry_name, p);
5624 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5625 } else {
5626 strcpy(agent_entry_name, sym_name);
5627 strcat(agent_entry_name, "_");
5628 strncat(agent_entry_name, lib_name, name_len);
5629 }
5630 } else {
5631 strcpy(agent_entry_name, sym_name);
5632 }
5633 return agent_entry_name;
5634 }
5635
5636 #ifndef PRODUCT
5637
5638 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5639 // contiguous memory block at a particular address.
5640 // The test first tries to find a good approximate address to allocate at by using the same
5641 // method to allocate some memory at any address. The test then tries to allocate memory in
5642 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5643 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5644 // the previously allocated memory is available for allocation. The only actual failure
5645 // that is reported is when the test tries to allocate at a particular location but gets a
5646 // different valid one. A NULL return value at this point is not considered an error but may
5647 // be legitimate.
5648 void TestReserveMemorySpecial_test() {
5649 if (!UseLargePages) {
5650 return;
5651 }
5652 // save current value of globals
5653 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5654 bool old_use_numa_interleaving = UseNUMAInterleaving;
5655
5656 // set globals to make sure we hit the correct code path
5657 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5658
5659 // do an allocation at an address selected by the OS to get a good one.
5660 const size_t large_allocation_size = os::large_page_size() * 4;
5661 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5662 if (result == NULL) {
5663 } else {
5664 os::release_memory_special(result, large_allocation_size);
5665
5666 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5667 // we managed to get it once.
5668 const size_t expected_allocation_size = os::large_page_size();
5669 char* expected_location = result + os::large_page_size();
5670 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5671 if (actual_location == NULL) {
5672 } else {
5673 // release memory
5674 os::release_memory_special(actual_location, expected_allocation_size);
5675 // only now check, after releasing any memory to avoid any leaks.
5676 assert(actual_location == expected_location,
5677 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5678 expected_location, expected_allocation_size, actual_location);
5679 }
5680 }
5681
5682 // restore globals
5683 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5684 UseNUMAInterleaving = old_use_numa_interleaving;
5685 }
5686 #endif // PRODUCT
5687
5688 /*
5689 All the defined signal names for Windows.
5690
5691 NOTE that not all of these names are accepted by FindSignal!
5692
5693 For various reasons some of these may be rejected at runtime.
5694
5695 Here are the names currently accepted by a user of sun.misc.Signal with
5696 1.4.1 (ignoring potential interaction with use of chaining, etc):
5697
5698 (LIST TBD)
5699
5700 */
5701 int os::get_signal_number(const char* name) {
5702 static const struct {
5703 char* name;
5704 int number;
5705 } siglabels [] =
5706 // derived from version 6.0 VC98/include/signal.h
5707 {"ABRT", SIGABRT, // abnormal termination triggered by abort cl
5708 "FPE", SIGFPE, // floating point exception
5709 "SEGV", SIGSEGV, // segment violation
5710 "INT", SIGINT, // interrupt
5711 "TERM", SIGTERM, // software term signal from kill
5712 "BREAK", SIGBREAK, // Ctrl-Break sequence
5713 "ILL", SIGILL}; // illegal instruction
5714 for (unsigned i = 0; i < ARRAY_SIZE(siglabels); ++i) {
5715 if (strcmp(name, siglabels[i].name) == 0) {
5716 return siglabels[i].number;
5717 }
5718 }
5719 return -1;
5720 }
5721
5722 // Fast current thread access
5723
5724 int os::win32::_thread_ptr_offset = 0;
5725
5726 static void call_wrapper_dummy() {}
5727
5728 // We need to call the os_exception_wrapper once so that it sets
5729 // up the offset from FS of the thread pointer.
5730 void os::win32::initialize_thread_ptr_offset() {
5731 os::os_exception_wrapper((java_call_t)call_wrapper_dummy,
5732 NULL, NULL, NULL, NULL);
5733 }