1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // Must be at least Windows 2000 or XP to use IsDebuggerPresent
26 #define _WIN32_WINNT 0x500
27
28 // no precompiled headers
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/disassembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "jvm_windows.h"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/filemap.hpp"
40 #include "mutex_windows.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "os_share_windows.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 #ifdef _DEBUG
73 #include <crtdbg.h>
74 #endif
75
76
77 #include <windows.h>
78 #include <sys/types.h>
79 #include <sys/stat.h>
80 #include <sys/timeb.h>
81 #include <objidl.h>
82 #include <shlobj.h>
83
84 #include <malloc.h>
85 #include <signal.h>
86 #include <direct.h>
87 #include <errno.h>
88 #include <fcntl.h>
89 #include <io.h>
90 #include <process.h> // For _beginthreadex(), _endthreadex()
91 #include <imagehlp.h> // For os::dll_address_to_function_name
92 /* for enumerating dll libraries */
93 #include <vdmdbg.h>
94
95 // for timer info max values which include all bits
96 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
97
98 // For DLL loading/load error detection
99 // Values of PE COFF
100 #define IMAGE_FILE_PTR_TO_SIGNATURE 0x3c
101 #define IMAGE_FILE_SIGNATURE_LENGTH 4
102
103 static HANDLE main_process;
104 static HANDLE main_thread;
105 static int main_thread_id;
106
107 static FILETIME process_creation_time;
108 static FILETIME process_exit_time;
109 static FILETIME process_user_time;
110 static FILETIME process_kernel_time;
111
112 #ifdef _M_IA64
113 #define __CPU__ ia64
114 #else
115 #ifdef _M_AMD64
116 #define __CPU__ amd64
117 #else
118 #define __CPU__ i486
119 #endif
120 #endif
121
122 // save DLL module handle, used by GetModuleFileName
123
124 HINSTANCE vm_lib_handle;
125
126 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved) {
127 switch (reason) {
128 case DLL_PROCESS_ATTACH:
129 vm_lib_handle = hinst;
130 if(ForceTimeHighResolution)
131 timeBeginPeriod(1L);
132 break;
133 case DLL_PROCESS_DETACH:
134 if(ForceTimeHighResolution)
135 timeEndPeriod(1L);
136
137 break;
138 default:
139 break;
140 }
141 return true;
142 }
143
144 static inline double fileTimeAsDouble(FILETIME* time) {
145 const double high = (double) ((unsigned int) ~0);
146 const double split = 10000000.0;
147 double result = (time->dwLowDateTime / split) +
148 time->dwHighDateTime * (high/split);
149 return result;
150 }
151
152 // Implementation of os
153
154 bool os::getenv(const char* name, char* buffer, int len) {
155 int result = GetEnvironmentVariable(name, buffer, len);
156 return result > 0 && result < len;
157 }
158
159 bool os::unsetenv(const char* name) {
160 assert(name != NULL, "Null pointer");
161 return (SetEnvironmentVariable(name, NULL) == TRUE);
162 }
163
164 // No setuid programs under Windows.
165 bool os::have_special_privileges() {
166 return false;
167 }
168
169
170 // This method is a periodic task to check for misbehaving JNI applications
171 // under CheckJNI, we can add any periodic checks here.
172 // For Windows at the moment does nothing
173 void os::run_periodic_checks() {
174 return;
175 }
176
177 #ifndef _WIN64
178 // previous UnhandledExceptionFilter, if there is one
179 static LPTOP_LEVEL_EXCEPTION_FILTER prev_uef_handler = NULL;
180
181 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo);
182 #endif
183 void os::init_system_properties_values() {
184 /* sysclasspath, java_home, dll_dir */
185 {
186 char *home_path;
187 char *dll_path;
188 char *pslash;
189 char *bin = "\\bin";
190 char home_dir[MAX_PATH];
191
192 if (!getenv("_ALT_JAVA_HOME_DIR", home_dir, MAX_PATH)) {
193 os::jvm_path(home_dir, sizeof(home_dir));
194 // Found the full path to jvm.dll.
195 // Now cut the path to <java_home>/jre if we can.
196 *(strrchr(home_dir, '\\')) = '\0'; /* get rid of \jvm.dll */
197 pslash = strrchr(home_dir, '\\');
198 if (pslash != NULL) {
199 *pslash = '\0'; /* get rid of \{client|server} */
200 pslash = strrchr(home_dir, '\\');
201 if (pslash != NULL)
202 *pslash = '\0'; /* get rid of \bin */
203 }
204 }
205
206 home_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + 1, mtInternal);
207 if (home_path == NULL)
208 return;
209 strcpy(home_path, home_dir);
210 Arguments::set_java_home(home_path);
211
212 dll_path = NEW_C_HEAP_ARRAY(char, strlen(home_dir) + strlen(bin) + 1, mtInternal);
213 if (dll_path == NULL)
214 return;
215 strcpy(dll_path, home_dir);
216 strcat(dll_path, bin);
217 Arguments::set_dll_dir(dll_path);
218
219 if (!set_boot_path('\\', ';'))
220 return;
221 }
222
223 /* library_path */
224 #define EXT_DIR "\\lib\\ext"
225 #define BIN_DIR "\\bin"
226 #define PACKAGE_DIR "\\Sun\\Java"
227 {
228 /* Win32 library search order (See the documentation for LoadLibrary):
229 *
230 * 1. The directory from which application is loaded.
231 * 2. The system wide Java Extensions directory (Java only)
232 * 3. System directory (GetSystemDirectory)
233 * 4. Windows directory (GetWindowsDirectory)
234 * 5. The PATH environment variable
235 * 6. The current directory
236 */
237
238 char *library_path;
239 char tmp[MAX_PATH];
240 char *path_str = ::getenv("PATH");
241
242 library_path = NEW_C_HEAP_ARRAY(char, MAX_PATH * 5 + sizeof(PACKAGE_DIR) +
243 sizeof(BIN_DIR) + (path_str ? strlen(path_str) : 0) + 10, mtInternal);
244
245 library_path[0] = '\0';
246
247 GetModuleFileName(NULL, tmp, sizeof(tmp));
248 *(strrchr(tmp, '\\')) = '\0';
249 strcat(library_path, tmp);
250
251 GetWindowsDirectory(tmp, sizeof(tmp));
252 strcat(library_path, ";");
253 strcat(library_path, tmp);
254 strcat(library_path, PACKAGE_DIR BIN_DIR);
255
256 GetSystemDirectory(tmp, sizeof(tmp));
257 strcat(library_path, ";");
258 strcat(library_path, tmp);
259
260 GetWindowsDirectory(tmp, sizeof(tmp));
261 strcat(library_path, ";");
262 strcat(library_path, tmp);
263
264 if (path_str) {
265 strcat(library_path, ";");
266 strcat(library_path, path_str);
267 }
268
269 strcat(library_path, ";.");
270
271 Arguments::set_library_path(library_path);
272 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
273 }
274
275 /* Default extensions directory */
276 {
277 char path[MAX_PATH];
278 char buf[2 * MAX_PATH + 2 * sizeof(EXT_DIR) + sizeof(PACKAGE_DIR) + 1];
279 GetWindowsDirectory(path, MAX_PATH);
280 sprintf(buf, "%s%s;%s%s%s", Arguments::get_java_home(), EXT_DIR,
281 path, PACKAGE_DIR, EXT_DIR);
282 Arguments::set_ext_dirs(buf);
283 }
284 #undef EXT_DIR
285 #undef BIN_DIR
286 #undef PACKAGE_DIR
287
288 /* Default endorsed standards directory. */
289 {
290 #define ENDORSED_DIR "\\lib\\endorsed"
291 size_t len = strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR);
292 char * buf = NEW_C_HEAP_ARRAY(char, len, mtInternal);
293 sprintf(buf, "%s%s", Arguments::get_java_home(), ENDORSED_DIR);
294 Arguments::set_endorsed_dirs(buf);
295 #undef ENDORSED_DIR
296 }
297
298 #ifndef _WIN64
299 // set our UnhandledExceptionFilter and save any previous one
300 prev_uef_handler = SetUnhandledExceptionFilter(Handle_FLT_Exception);
301 #endif
302
303 // Done
304 return;
305 }
306
307 void os::breakpoint() {
308 DebugBreak();
309 }
310
311 // Invoked from the BREAKPOINT Macro
312 extern "C" void breakpoint() {
313 os::breakpoint();
314 }
315
316 /*
317 * RtlCaptureStackBackTrace Windows API may not exist prior to Windows XP.
318 * So far, this method is only used by Native Memory Tracking, which is
319 * only supported on Windows XP or later.
320 */
321
322 int os::get_native_stack(address* stack, int frames, int toSkip) {
323 #ifdef _NMT_NOINLINE_
324 toSkip ++;
325 #endif
326 int captured = Kernel32Dll::RtlCaptureStackBackTrace(toSkip + 1, frames,
327 (PVOID*)stack, NULL);
328 for (int index = captured; index < frames; index ++) {
329 stack[index] = NULL;
330 }
331 return captured;
332 }
333
334
335 // os::current_stack_base()
336 //
337 // Returns the base of the stack, which is the stack's
338 // starting address. This function must be called
339 // while running on the stack of the thread being queried.
340
341 address os::current_stack_base() {
342 MEMORY_BASIC_INFORMATION minfo;
343 address stack_bottom;
344 size_t stack_size;
345
346 VirtualQuery(&minfo, &minfo, sizeof(minfo));
347 stack_bottom = (address)minfo.AllocationBase;
348 stack_size = minfo.RegionSize;
349
350 // Add up the sizes of all the regions with the same
351 // AllocationBase.
352 while( 1 )
353 {
354 VirtualQuery(stack_bottom+stack_size, &minfo, sizeof(minfo));
355 if ( stack_bottom == (address)minfo.AllocationBase )
356 stack_size += minfo.RegionSize;
357 else
358 break;
359 }
360
361 #ifdef _M_IA64
362 // IA64 has memory and register stacks
363 //
364 // This is the stack layout you get on NT/IA64 if you specify 1MB stack limit
365 // at thread creation (1MB backing store growing upwards, 1MB memory stack
366 // growing downwards, 2MB summed up)
367 //
368 // ...
369 // ------- top of stack (high address) -----
370 // |
371 // | 1MB
372 // | Backing Store (Register Stack)
373 // |
374 // | / \
375 // | |
376 // | |
377 // | |
378 // ------------------------ stack base -----
379 // | 1MB
380 // | Memory Stack
381 // |
382 // | |
383 // | |
384 // | |
385 // | \ /
386 // |
387 // ----- bottom of stack (low address) -----
388 // ...
389
390 stack_size = stack_size / 2;
391 #endif
392 return stack_bottom + stack_size;
393 }
394
395 size_t os::current_stack_size() {
396 size_t sz;
397 MEMORY_BASIC_INFORMATION minfo;
398 VirtualQuery(&minfo, &minfo, sizeof(minfo));
399 sz = (size_t)os::current_stack_base() - (size_t)minfo.AllocationBase;
400 return sz;
401 }
402
403 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
404 const struct tm* time_struct_ptr = localtime(clock);
405 if (time_struct_ptr != NULL) {
406 *res = *time_struct_ptr;
407 return res;
408 }
409 return NULL;
410 }
411
412 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo);
413
414 // Thread start routine for all new Java threads
415 static unsigned __stdcall java_start(Thread* thread) {
416 // Try to randomize the cache line index of hot stack frames.
417 // This helps when threads of the same stack traces evict each other's
418 // cache lines. The threads can be either from the same JVM instance, or
419 // from different JVM instances. The benefit is especially true for
420 // processors with hyperthreading technology.
421 static int counter = 0;
422 int pid = os::current_process_id();
423 _alloca(((pid ^ counter++) & 7) * 128);
424
425 OSThread* osthr = thread->osthread();
426 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
427
428 if (UseNUMA) {
429 int lgrp_id = os::numa_get_group_id();
430 if (lgrp_id != -1) {
431 thread->set_lgrp_id(lgrp_id);
432 }
433 }
434
435
436 // Install a win32 structured exception handler around every thread created
437 // by VM, so VM can genrate error dump when an exception occurred in non-
438 // Java thread (e.g. VM thread).
439 __try {
440 thread->run();
441 } __except(topLevelExceptionFilter(
442 (_EXCEPTION_POINTERS*)_exception_info())) {
443 // Nothing to do.
444 }
445
446 // One less thread is executing
447 // When the VMThread gets here, the main thread may have already exited
448 // which frees the CodeHeap containing the Atomic::add code
449 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
450 Atomic::dec_ptr((intptr_t*)&os::win32::_os_thread_count);
451 }
452
453 return 0;
454 }
455
456 static OSThread* create_os_thread(Thread* thread, HANDLE thread_handle, int thread_id) {
457 // Allocate the OSThread object
458 OSThread* osthread = new OSThread(NULL, NULL);
459 if (osthread == NULL) return NULL;
460
461 // Initialize support for Java interrupts
462 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
463 if (interrupt_event == NULL) {
464 delete osthread;
465 return NULL;
466 }
467 osthread->set_interrupt_event(interrupt_event);
468
469 // Store info on the Win32 thread into the OSThread
470 osthread->set_thread_handle(thread_handle);
471 osthread->set_thread_id(thread_id);
472
473 if (UseNUMA) {
474 int lgrp_id = os::numa_get_group_id();
475 if (lgrp_id != -1) {
476 thread->set_lgrp_id(lgrp_id);
477 }
478 }
479
480 // Initial thread state is INITIALIZED, not SUSPENDED
481 osthread->set_state(INITIALIZED);
482
483 return osthread;
484 }
485
486
487 bool os::create_attached_thread(JavaThread* thread) {
488 #ifdef ASSERT
489 thread->verify_not_published();
490 #endif
491 HANDLE thread_h;
492 if (!DuplicateHandle(main_process, GetCurrentThread(), GetCurrentProcess(),
493 &thread_h, THREAD_ALL_ACCESS, false, 0)) {
494 fatal("DuplicateHandle failed\n");
495 }
496 OSThread* osthread = create_os_thread(thread, thread_h,
497 (int)current_thread_id());
498 if (osthread == NULL) {
499 return false;
500 }
501
502 // Initial thread state is RUNNABLE
503 osthread->set_state(RUNNABLE);
504
505 thread->set_osthread(osthread);
506 return true;
507 }
508
509 bool os::create_main_thread(JavaThread* thread) {
510 #ifdef ASSERT
511 thread->verify_not_published();
512 #endif
513 if (_starting_thread == NULL) {
514 _starting_thread = create_os_thread(thread, main_thread, main_thread_id);
515 if (_starting_thread == NULL) {
516 return false;
517 }
518 }
519
520 // The primordial thread is runnable from the start)
521 _starting_thread->set_state(RUNNABLE);
522
523 thread->set_osthread(_starting_thread);
524 return true;
525 }
526
527 // Allocate and initialize a new OSThread
528 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
529 unsigned thread_id;
530
531 // Allocate the OSThread object
532 OSThread* osthread = new OSThread(NULL, NULL);
533 if (osthread == NULL) {
534 return false;
535 }
536
537 // Initialize support for Java interrupts
538 HANDLE interrupt_event = CreateEvent(NULL, true, false, NULL);
539 if (interrupt_event == NULL) {
540 delete osthread;
541 return NULL;
542 }
543 osthread->set_interrupt_event(interrupt_event);
544 osthread->set_interrupted(false);
545
546 thread->set_osthread(osthread);
547
548 if (stack_size == 0) {
549 switch (thr_type) {
550 case os::java_thread:
551 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
552 if (JavaThread::stack_size_at_create() > 0)
553 stack_size = JavaThread::stack_size_at_create();
554 break;
555 case os::compiler_thread:
556 if (CompilerThreadStackSize > 0) {
557 stack_size = (size_t)(CompilerThreadStackSize * K);
558 break;
559 } // else fall through:
560 // use VMThreadStackSize if CompilerThreadStackSize is not defined
561 case os::vm_thread:
562 case os::pgc_thread:
563 case os::cgc_thread:
564 case os::watcher_thread:
565 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
566 break;
567 }
568 }
569
570 // Create the Win32 thread
571 //
572 // Contrary to what MSDN document says, "stack_size" in _beginthreadex()
573 // does not specify stack size. Instead, it specifies the size of
574 // initially committed space. The stack size is determined by
575 // PE header in the executable. If the committed "stack_size" is larger
576 // than default value in the PE header, the stack is rounded up to the
577 // nearest multiple of 1MB. For example if the launcher has default
578 // stack size of 320k, specifying any size less than 320k does not
579 // affect the actual stack size at all, it only affects the initial
580 // commitment. On the other hand, specifying 'stack_size' larger than
581 // default value may cause significant increase in memory usage, because
582 // not only the stack space will be rounded up to MB, but also the
583 // entire space is committed upfront.
584 //
585 // Finally Windows XP added a new flag 'STACK_SIZE_PARAM_IS_A_RESERVATION'
586 // for CreateThread() that can treat 'stack_size' as stack size. However we
587 // are not supposed to call CreateThread() directly according to MSDN
588 // document because JVM uses C runtime library. The good news is that the
589 // flag appears to work with _beginthredex() as well.
590
591 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
592 #define STACK_SIZE_PARAM_IS_A_RESERVATION (0x10000)
593 #endif
594
595 HANDLE thread_handle =
596 (HANDLE)_beginthreadex(NULL,
597 (unsigned)stack_size,
598 (unsigned (__stdcall *)(void*)) java_start,
599 thread,
600 CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
601 &thread_id);
602 if (thread_handle == NULL) {
603 // perhaps STACK_SIZE_PARAM_IS_A_RESERVATION is not supported, try again
604 // without the flag.
605 thread_handle =
606 (HANDLE)_beginthreadex(NULL,
607 (unsigned)stack_size,
608 (unsigned (__stdcall *)(void*)) java_start,
609 thread,
610 CREATE_SUSPENDED,
611 &thread_id);
612 }
613 if (thread_handle == NULL) {
614 // Need to clean up stuff we've allocated so far
615 CloseHandle(osthread->interrupt_event());
616 thread->set_osthread(NULL);
617 delete osthread;
618 return NULL;
619 }
620
621 Atomic::inc_ptr((intptr_t*)&os::win32::_os_thread_count);
622
623 // Store info on the Win32 thread into the OSThread
624 osthread->set_thread_handle(thread_handle);
625 osthread->set_thread_id(thread_id);
626
627 // Initial thread state is INITIALIZED, not SUSPENDED
628 osthread->set_state(INITIALIZED);
629
630 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
631 return true;
632 }
633
634
635 // Free Win32 resources related to the OSThread
636 void os::free_thread(OSThread* osthread) {
637 assert(osthread != NULL, "osthread not set");
638 CloseHandle(osthread->thread_handle());
639 CloseHandle(osthread->interrupt_event());
640 delete osthread;
641 }
642
643
644 static int has_performance_count = 0;
645 static jlong first_filetime;
646 static jlong initial_performance_count;
647 static jlong performance_frequency;
648
649
650 jlong as_long(LARGE_INTEGER x) {
651 jlong result = 0; // initialization to avoid warning
652 set_high(&result, x.HighPart);
653 set_low(&result, x.LowPart);
654 return result;
655 }
656
657
658 jlong os::elapsed_counter() {
659 LARGE_INTEGER count;
660 if (has_performance_count) {
661 QueryPerformanceCounter(&count);
662 return as_long(count) - initial_performance_count;
663 } else {
664 FILETIME wt;
665 GetSystemTimeAsFileTime(&wt);
666 return (jlong_from(wt.dwHighDateTime, wt.dwLowDateTime) - first_filetime);
667 }
668 }
669
670
671 jlong os::elapsed_frequency() {
672 if (has_performance_count) {
673 return performance_frequency;
674 } else {
675 // the FILETIME time is the number of 100-nanosecond intervals since January 1,1601.
676 return 10000000;
677 }
678 }
679
680
681 julong os::available_memory() {
682 return win32::available_memory();
683 }
684
685 julong os::win32::available_memory() {
686 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
687 // value if total memory is larger than 4GB
688 MEMORYSTATUSEX ms;
689 ms.dwLength = sizeof(ms);
690 GlobalMemoryStatusEx(&ms);
691
692 return (julong)ms.ullAvailPhys;
693 }
694
695 julong os::physical_memory() {
696 return win32::physical_memory();
697 }
698
699 bool os::has_allocatable_memory_limit(julong* limit) {
700 MEMORYSTATUSEX ms;
701 ms.dwLength = sizeof(ms);
702 GlobalMemoryStatusEx(&ms);
703 #ifdef _LP64
704 *limit = (julong)ms.ullAvailVirtual;
705 return true;
706 #else
707 // Limit to 1400m because of the 2gb address space wall
708 *limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
709 return true;
710 #endif
711 }
712
713 // VC6 lacks DWORD_PTR
714 #if _MSC_VER < 1300
715 typedef UINT_PTR DWORD_PTR;
716 #endif
717
718 int os::active_processor_count() {
719 // User has overridden the number of active processors
720 if (ActiveProcessorCount > 0) {
721 if (PrintActiveCpus) {
722 tty->print_cr("active_processor_count: "
723 "active processor count set by user : %d",
724 ActiveProcessorCount);
725 }
726 return ActiveProcessorCount;
727 }
728
729 DWORD_PTR lpProcessAffinityMask = 0;
730 DWORD_PTR lpSystemAffinityMask = 0;
731 int proc_count = processor_count();
732 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
733 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
734 // Nof active processors is number of bits in process affinity mask
735 int bitcount = 0;
736 while (lpProcessAffinityMask != 0) {
737 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
738 bitcount++;
739 }
740 return bitcount;
741 } else {
742 return proc_count;
743 }
744 }
745
746 void os::set_native_thread_name(const char *name) {
747 // Not yet implemented.
748 return;
749 }
750
751 bool os::distribute_processes(uint length, uint* distribution) {
752 // Not yet implemented.
753 return false;
754 }
755
756 bool os::bind_to_processor(uint processor_id) {
757 // Not yet implemented.
758 return false;
759 }
760
761 static void initialize_performance_counter() {
762 LARGE_INTEGER count;
763 if (QueryPerformanceFrequency(&count)) {
764 has_performance_count = 1;
765 performance_frequency = as_long(count);
766 QueryPerformanceCounter(&count);
767 initial_performance_count = as_long(count);
768 } else {
769 has_performance_count = 0;
770 FILETIME wt;
771 GetSystemTimeAsFileTime(&wt);
772 first_filetime = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
773 }
774 }
775
776
777 double os::elapsedTime() {
778 return (double) elapsed_counter() / (double) elapsed_frequency();
779 }
780
781
782 // Windows format:
783 // The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.
784 // Java format:
785 // Java standards require the number of milliseconds since 1/1/1970
786
787 // Constant offset - calculated using offset()
788 static jlong _offset = 116444736000000000;
789 // Fake time counter for reproducible results when debugging
790 static jlong fake_time = 0;
791
792 #ifdef ASSERT
793 // Just to be safe, recalculate the offset in debug mode
794 static jlong _calculated_offset = 0;
795 static int _has_calculated_offset = 0;
796
797 jlong offset() {
798 if (_has_calculated_offset) return _calculated_offset;
799 SYSTEMTIME java_origin;
800 java_origin.wYear = 1970;
801 java_origin.wMonth = 1;
802 java_origin.wDayOfWeek = 0; // ignored
803 java_origin.wDay = 1;
804 java_origin.wHour = 0;
805 java_origin.wMinute = 0;
806 java_origin.wSecond = 0;
807 java_origin.wMilliseconds = 0;
808 FILETIME jot;
809 if (!SystemTimeToFileTime(&java_origin, &jot)) {
810 fatal(err_msg("Error = %d\nWindows error", GetLastError()));
811 }
812 _calculated_offset = jlong_from(jot.dwHighDateTime, jot.dwLowDateTime);
813 _has_calculated_offset = 1;
814 assert(_calculated_offset == _offset, "Calculated and constant time offsets must be equal");
815 return _calculated_offset;
816 }
817 #else
818 jlong offset() {
819 return _offset;
820 }
821 #endif
822
823 jlong windows_to_java_time(FILETIME wt) {
824 jlong a = jlong_from(wt.dwHighDateTime, wt.dwLowDateTime);
825 return (a - offset()) / 10000;
826 }
827
828 FILETIME java_to_windows_time(jlong l) {
829 jlong a = (l * 10000) + offset();
830 FILETIME result;
831 result.dwHighDateTime = high(a);
832 result.dwLowDateTime = low(a);
833 return result;
834 }
835
836 bool os::supports_vtime() { return true; }
837 bool os::enable_vtime() { return false; }
838 bool os::vtime_enabled() { return false; }
839
840 double os::elapsedVTime() {
841 FILETIME created;
842 FILETIME exited;
843 FILETIME kernel;
844 FILETIME user;
845 if (GetThreadTimes(GetCurrentThread(), &created, &exited, &kernel, &user) != 0) {
846 // the resolution of windows_to_java_time() should be sufficient (ms)
847 return (double) (windows_to_java_time(kernel) + windows_to_java_time(user)) / MILLIUNITS;
848 } else {
849 return elapsedTime();
850 }
851 }
852
853 jlong os::javaTimeMillis() {
854 if (UseFakeTimers) {
855 return fake_time++;
856 } else {
857 FILETIME wt;
858 GetSystemTimeAsFileTime(&wt);
859 return windows_to_java_time(wt);
860 }
861 }
862
863 jlong os::javaTimeNanos() {
864 if (!has_performance_count) {
865 return javaTimeMillis() * NANOSECS_PER_MILLISEC; // the best we can do.
866 } else {
867 LARGE_INTEGER current_count;
868 QueryPerformanceCounter(¤t_count);
869 double current = as_long(current_count);
870 double freq = performance_frequency;
871 jlong time = (jlong)((current/freq) * NANOSECS_PER_SEC);
872 return time;
873 }
874 }
875
876 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
877 if (!has_performance_count) {
878 // javaTimeMillis() doesn't have much percision,
879 // but it is not going to wrap -- so all 64 bits
880 info_ptr->max_value = ALL_64_BITS;
881
882 // this is a wall clock timer, so may skip
883 info_ptr->may_skip_backward = true;
884 info_ptr->may_skip_forward = true;
885 } else {
886 jlong freq = performance_frequency;
887 if (freq < NANOSECS_PER_SEC) {
888 // the performance counter is 64 bits and we will
889 // be multiplying it -- so no wrap in 64 bits
890 info_ptr->max_value = ALL_64_BITS;
891 } else if (freq > NANOSECS_PER_SEC) {
892 // use the max value the counter can reach to
893 // determine the max value which could be returned
894 julong max_counter = (julong)ALL_64_BITS;
895 info_ptr->max_value = (jlong)(max_counter / (freq / NANOSECS_PER_SEC));
896 } else {
897 // the performance counter is 64 bits and we will
898 // be using it directly -- so no wrap in 64 bits
899 info_ptr->max_value = ALL_64_BITS;
900 }
901
902 // using a counter, so no skipping
903 info_ptr->may_skip_backward = false;
904 info_ptr->may_skip_forward = false;
905 }
906 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
907 }
908
909 char* os::local_time_string(char *buf, size_t buflen) {
910 SYSTEMTIME st;
911 GetLocalTime(&st);
912 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
913 st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);
914 return buf;
915 }
916
917 bool os::getTimesSecs(double* process_real_time,
918 double* process_user_time,
919 double* process_system_time) {
920 HANDLE h_process = GetCurrentProcess();
921 FILETIME create_time, exit_time, kernel_time, user_time;
922 BOOL result = GetProcessTimes(h_process,
923 &create_time,
924 &exit_time,
925 &kernel_time,
926 &user_time);
927 if (result != 0) {
928 FILETIME wt;
929 GetSystemTimeAsFileTime(&wt);
930 jlong rtc_millis = windows_to_java_time(wt);
931 jlong user_millis = windows_to_java_time(user_time);
932 jlong system_millis = windows_to_java_time(kernel_time);
933 *process_real_time = ((double) rtc_millis) / ((double) MILLIUNITS);
934 *process_user_time = ((double) user_millis) / ((double) MILLIUNITS);
935 *process_system_time = ((double) system_millis) / ((double) MILLIUNITS);
936 return true;
937 } else {
938 return false;
939 }
940 }
941
942 void os::shutdown() {
943
944 // allow PerfMemory to attempt cleanup of any persistent resources
945 perfMemory_exit();
946
947 // flush buffered output, finish log files
948 ostream_abort();
949
950 // Check for abort hook
951 abort_hook_t abort_hook = Arguments::abort_hook();
952 if (abort_hook != NULL) {
953 abort_hook();
954 }
955 }
956
957
958 static BOOL (WINAPI *_MiniDumpWriteDump) ( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
959 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
960
961 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
962 HINSTANCE dbghelp;
963 EXCEPTION_POINTERS ep;
964 MINIDUMP_EXCEPTION_INFORMATION mei;
965 MINIDUMP_EXCEPTION_INFORMATION* pmei;
966
967 HANDLE hProcess = GetCurrentProcess();
968 DWORD processId = GetCurrentProcessId();
969 HANDLE dumpFile;
970 MINIDUMP_TYPE dumpType;
971 static const char* cwd;
972
973 // Default is to always create dump for debug builds, on product builds only dump on server versions of Windows.
974 #ifndef ASSERT
975 // If running on a client version of Windows and user has not explicitly enabled dumping
976 if (!os::win32::is_windows_server() && !CreateMinidumpOnCrash) {
977 VMError::report_coredump_status("Minidumps are not enabled by default on client versions of Windows", false);
978 return;
979 // If running on a server version of Windows and user has explictly disabled dumping
980 } else if (os::win32::is_windows_server() && !FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
981 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
982 return;
983 }
984 #else
985 if (!FLAG_IS_DEFAULT(CreateMinidumpOnCrash) && !CreateMinidumpOnCrash) {
986 VMError::report_coredump_status("Minidump has been disabled from the command line", false);
987 return;
988 }
989 #endif
990
991 dbghelp = os::win32::load_Windows_dll("DBGHELP.DLL", NULL, 0);
992
993 if (dbghelp == NULL) {
994 VMError::report_coredump_status("Failed to load dbghelp.dll", false);
995 return;
996 }
997
998 _MiniDumpWriteDump = CAST_TO_FN_PTR(
999 BOOL(WINAPI *)( HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
1000 PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION),
1001 GetProcAddress(dbghelp, "MiniDumpWriteDump"));
1002
1003 if (_MiniDumpWriteDump == NULL) {
1004 VMError::report_coredump_status("Failed to find MiniDumpWriteDump() in module dbghelp.dll", false);
1005 return;
1006 }
1007
1008 dumpType = (MINIDUMP_TYPE)(MiniDumpWithFullMemory | MiniDumpWithHandleData);
1009
1010 // Older versions of dbghelp.h doesn't contain all the dumptypes we want, dbghelp.h with
1011 // API_VERSION_NUMBER 11 or higher contains the ones we want though
1012 #if API_VERSION_NUMBER >= 11
1013 dumpType = (MINIDUMP_TYPE)(dumpType | MiniDumpWithFullMemoryInfo | MiniDumpWithThreadInfo |
1014 MiniDumpWithUnloadedModules);
1015 #endif
1016
1017 cwd = get_current_directory(NULL, 0);
1018 jio_snprintf(buffer, bufferSize, "%s\\hs_err_pid%u.mdmp",cwd, current_process_id());
1019 dumpFile = CreateFile(buffer, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
1020
1021 if (dumpFile == INVALID_HANDLE_VALUE) {
1022 VMError::report_coredump_status("Failed to create file for dumping", false);
1023 return;
1024 }
1025 if (exceptionRecord != NULL && contextRecord != NULL) {
1026 ep.ContextRecord = (PCONTEXT) contextRecord;
1027 ep.ExceptionRecord = (PEXCEPTION_RECORD) exceptionRecord;
1028
1029 mei.ThreadId = GetCurrentThreadId();
1030 mei.ExceptionPointers = &ep;
1031 pmei = &mei;
1032 } else {
1033 pmei = NULL;
1034 }
1035
1036
1037 // Older versions of dbghelp.dll (the one shipped with Win2003 for example) may not support all
1038 // the dump types we really want. If first call fails, lets fall back to just use MiniDumpWithFullMemory then.
1039 if (_MiniDumpWriteDump(hProcess, processId, dumpFile, dumpType, pmei, NULL, NULL) == false &&
1040 _MiniDumpWriteDump(hProcess, processId, dumpFile, (MINIDUMP_TYPE)MiniDumpWithFullMemory, pmei, NULL, NULL) == false) {
1041 DWORD error = GetLastError();
1042 LPTSTR msgbuf = NULL;
1043
1044 if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
1045 FORMAT_MESSAGE_FROM_SYSTEM |
1046 FORMAT_MESSAGE_IGNORE_INSERTS,
1047 NULL, error, 0, (LPTSTR)&msgbuf, 0, NULL) != 0) {
1048
1049 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x: %s)", error, msgbuf);
1050 LocalFree(msgbuf);
1051 } else {
1052 // Call to FormatMessage failed, just include the result from GetLastError
1053 jio_snprintf(buffer, bufferSize, "Call to MiniDumpWriteDump() failed (Error 0x%x)", error);
1054 }
1055 VMError::report_coredump_status(buffer, false);
1056 } else {
1057 VMError::report_coredump_status(buffer, true);
1058 }
1059
1060 CloseHandle(dumpFile);
1061 }
1062
1063
1064
1065 void os::abort(bool dump_core)
1066 {
1067 os::shutdown();
1068 // no core dump on Windows
1069 ::exit(1);
1070 }
1071
1072 // Die immediately, no exit hook, no abort hook, no cleanup.
1073 void os::die() {
1074 _exit(-1);
1075 }
1076
1077 // Directory routines copied from src/win32/native/java/io/dirent_md.c
1078 // * dirent_md.c 1.15 00/02/02
1079 //
1080 // The declarations for DIR and struct dirent are in jvm_win32.h.
1081
1082 /* Caller must have already run dirname through JVM_NativePath, which removes
1083 duplicate slashes and converts all instances of '/' into '\\'. */
1084
1085 DIR *
1086 os::opendir(const char *dirname)
1087 {
1088 assert(dirname != NULL, "just checking"); // hotspot change
1089 DIR *dirp = (DIR *)malloc(sizeof(DIR), mtInternal);
1090 DWORD fattr; // hotspot change
1091 char alt_dirname[4] = { 0, 0, 0, 0 };
1092
1093 if (dirp == 0) {
1094 errno = ENOMEM;
1095 return 0;
1096 }
1097
1098 /*
1099 * Win32 accepts "\" in its POSIX stat(), but refuses to treat it
1100 * as a directory in FindFirstFile(). We detect this case here and
1101 * prepend the current drive name.
1102 */
1103 if (dirname[1] == '\0' && dirname[0] == '\\') {
1104 alt_dirname[0] = _getdrive() + 'A' - 1;
1105 alt_dirname[1] = ':';
1106 alt_dirname[2] = '\\';
1107 alt_dirname[3] = '\0';
1108 dirname = alt_dirname;
1109 }
1110
1111 dirp->path = (char *)malloc(strlen(dirname) + 5, mtInternal);
1112 if (dirp->path == 0) {
1113 free(dirp, mtInternal);
1114 errno = ENOMEM;
1115 return 0;
1116 }
1117 strcpy(dirp->path, dirname);
1118
1119 fattr = GetFileAttributes(dirp->path);
1120 if (fattr == 0xffffffff) {
1121 free(dirp->path, mtInternal);
1122 free(dirp, mtInternal);
1123 errno = ENOENT;
1124 return 0;
1125 } else if ((fattr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
1126 free(dirp->path, mtInternal);
1127 free(dirp, mtInternal);
1128 errno = ENOTDIR;
1129 return 0;
1130 }
1131
1132 /* Append "*.*", or possibly "\\*.*", to path */
1133 if (dirp->path[1] == ':'
1134 && (dirp->path[2] == '\0'
1135 || (dirp->path[2] == '\\' && dirp->path[3] == '\0'))) {
1136 /* No '\\' needed for cases like "Z:" or "Z:\" */
1137 strcat(dirp->path, "*.*");
1138 } else {
1139 strcat(dirp->path, "\\*.*");
1140 }
1141
1142 dirp->handle = FindFirstFile(dirp->path, &dirp->find_data);
1143 if (dirp->handle == INVALID_HANDLE_VALUE) {
1144 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
1145 free(dirp->path, mtInternal);
1146 free(dirp, mtInternal);
1147 errno = EACCES;
1148 return 0;
1149 }
1150 }
1151 return dirp;
1152 }
1153
1154 /* parameter dbuf unused on Windows */
1155
1156 struct dirent *
1157 os::readdir(DIR *dirp, dirent *dbuf)
1158 {
1159 assert(dirp != NULL, "just checking"); // hotspot change
1160 if (dirp->handle == INVALID_HANDLE_VALUE) {
1161 return 0;
1162 }
1163
1164 strcpy(dirp->dirent.d_name, dirp->find_data.cFileName);
1165
1166 if (!FindNextFile(dirp->handle, &dirp->find_data)) {
1167 if (GetLastError() == ERROR_INVALID_HANDLE) {
1168 errno = EBADF;
1169 return 0;
1170 }
1171 FindClose(dirp->handle);
1172 dirp->handle = INVALID_HANDLE_VALUE;
1173 }
1174
1175 return &dirp->dirent;
1176 }
1177
1178 int
1179 os::closedir(DIR *dirp)
1180 {
1181 assert(dirp != NULL, "just checking"); // hotspot change
1182 if (dirp->handle != INVALID_HANDLE_VALUE) {
1183 if (!FindClose(dirp->handle)) {
1184 errno = EBADF;
1185 return -1;
1186 }
1187 dirp->handle = INVALID_HANDLE_VALUE;
1188 }
1189 free(dirp->path, mtInternal);
1190 free(dirp, mtInternal);
1191 return 0;
1192 }
1193
1194 // This must be hard coded because it's the system's temporary
1195 // directory not the java application's temp directory, ala java.io.tmpdir.
1196 const char* os::get_temp_directory() {
1197 static char path_buf[MAX_PATH];
1198 if (GetTempPath(MAX_PATH, path_buf)>0)
1199 return path_buf;
1200 else{
1201 path_buf[0]='\0';
1202 return path_buf;
1203 }
1204 }
1205
1206 static bool file_exists(const char* filename) {
1207 if (filename == NULL || strlen(filename) == 0) {
1208 return false;
1209 }
1210 return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;
1211 }
1212
1213 bool os::dll_build_name(char *buffer, size_t buflen,
1214 const char* pname, const char* fname) {
1215 bool retval = false;
1216 const size_t pnamelen = pname ? strlen(pname) : 0;
1217 const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;
1218
1219 // Return error on buffer overflow.
1220 if (pnamelen + strlen(fname) + 10 > buflen) {
1221 return retval;
1222 }
1223
1224 if (pnamelen == 0) {
1225 jio_snprintf(buffer, buflen, "%s.dll", fname);
1226 retval = true;
1227 } else if (c == ':' || c == '\\') {
1228 jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);
1229 retval = true;
1230 } else if (strchr(pname, *os::path_separator()) != NULL) {
1231 int n;
1232 char** pelements = split_path(pname, &n);
1233 if (pelements == NULL) {
1234 return false;
1235 }
1236 for (int i = 0 ; i < n ; i++) {
1237 char* path = pelements[i];
1238 // Really shouldn't be NULL, but check can't hurt
1239 size_t plen = (path == NULL) ? 0 : strlen(path);
1240 if (plen == 0) {
1241 continue; // skip the empty path values
1242 }
1243 const char lastchar = path[plen - 1];
1244 if (lastchar == ':' || lastchar == '\\') {
1245 jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);
1246 } else {
1247 jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);
1248 }
1249 if (file_exists(buffer)) {
1250 retval = true;
1251 break;
1252 }
1253 }
1254 // release the storage
1255 for (int i = 0 ; i < n ; i++) {
1256 if (pelements[i] != NULL) {
1257 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1258 }
1259 }
1260 if (pelements != NULL) {
1261 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1262 }
1263 } else {
1264 jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);
1265 retval = true;
1266 }
1267 return retval;
1268 }
1269
1270 // Needs to be in os specific directory because windows requires another
1271 // header file <direct.h>
1272 const char* os::get_current_directory(char *buf, size_t buflen) {
1273 int n = static_cast<int>(buflen);
1274 if (buflen > INT_MAX) n = INT_MAX;
1275 return _getcwd(buf, n);
1276 }
1277
1278 //-----------------------------------------------------------
1279 // Helper functions for fatal error handler
1280 #ifdef _WIN64
1281 // Helper routine which returns true if address in
1282 // within the NTDLL address space.
1283 //
1284 static bool _addr_in_ntdll( address addr )
1285 {
1286 HMODULE hmod;
1287 MODULEINFO minfo;
1288
1289 hmod = GetModuleHandle("NTDLL.DLL");
1290 if ( hmod == NULL ) return false;
1291 if ( !os::PSApiDll::GetModuleInformation( GetCurrentProcess(), hmod,
1292 &minfo, sizeof(MODULEINFO)) )
1293 return false;
1294
1295 if ( (addr >= minfo.lpBaseOfDll) &&
1296 (addr < (address)((uintptr_t)minfo.lpBaseOfDll + (uintptr_t)minfo.SizeOfImage)))
1297 return true;
1298 else
1299 return false;
1300 }
1301 #endif
1302
1303
1304 // Enumerate all modules for a given process ID
1305 //
1306 // Notice that Windows 95/98/Me and Windows NT/2000/XP have
1307 // different API for doing this. We use PSAPI.DLL on NT based
1308 // Windows and ToolHelp on 95/98/Me.
1309
1310 // Callback function that is called by enumerate_modules() on
1311 // every DLL module.
1312 // Input parameters:
1313 // int pid,
1314 // char* module_file_name,
1315 // address module_base_addr,
1316 // unsigned module_size,
1317 // void* param
1318 typedef int (*EnumModulesCallbackFunc)(int, char *, address, unsigned, void *);
1319
1320 // enumerate_modules for Windows NT, using PSAPI
1321 static int _enumerate_modules_winnt( int pid, EnumModulesCallbackFunc func, void * param)
1322 {
1323 HANDLE hProcess ;
1324
1325 # define MAX_NUM_MODULES 128
1326 HMODULE modules[MAX_NUM_MODULES];
1327 static char filename[ MAX_PATH ];
1328 int result = 0;
1329
1330 if (!os::PSApiDll::PSApiAvailable()) {
1331 return 0;
1332 }
1333
1334 hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ,
1335 FALSE, pid ) ;
1336 if (hProcess == NULL) return 0;
1337
1338 DWORD size_needed;
1339 if (!os::PSApiDll::EnumProcessModules(hProcess, modules,
1340 sizeof(modules), &size_needed)) {
1341 CloseHandle( hProcess );
1342 return 0;
1343 }
1344
1345 // number of modules that are currently loaded
1346 int num_modules = size_needed / sizeof(HMODULE);
1347
1348 for (int i = 0; i < MIN2(num_modules, MAX_NUM_MODULES); i++) {
1349 // Get Full pathname:
1350 if(!os::PSApiDll::GetModuleFileNameEx(hProcess, modules[i],
1351 filename, sizeof(filename))) {
1352 filename[0] = '\0';
1353 }
1354
1355 MODULEINFO modinfo;
1356 if (!os::PSApiDll::GetModuleInformation(hProcess, modules[i],
1357 &modinfo, sizeof(modinfo))) {
1358 modinfo.lpBaseOfDll = NULL;
1359 modinfo.SizeOfImage = 0;
1360 }
1361
1362 // Invoke callback function
1363 result = func(pid, filename, (address)modinfo.lpBaseOfDll,
1364 modinfo.SizeOfImage, param);
1365 if (result) break;
1366 }
1367
1368 CloseHandle( hProcess ) ;
1369 return result;
1370 }
1371
1372
1373 // enumerate_modules for Windows 95/98/ME, using TOOLHELP
1374 static int _enumerate_modules_windows( int pid, EnumModulesCallbackFunc func, void *param)
1375 {
1376 HANDLE hSnapShot ;
1377 static MODULEENTRY32 modentry ;
1378 int result = 0;
1379
1380 if (!os::Kernel32Dll::HelpToolsAvailable()) {
1381 return 0;
1382 }
1383
1384 // Get a handle to a Toolhelp snapshot of the system
1385 hSnapShot = os::Kernel32Dll::CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pid ) ;
1386 if( hSnapShot == INVALID_HANDLE_VALUE ) {
1387 return FALSE ;
1388 }
1389
1390 // iterate through all modules
1391 modentry.dwSize = sizeof(MODULEENTRY32) ;
1392 bool not_done = os::Kernel32Dll::Module32First( hSnapShot, &modentry ) != 0;
1393
1394 while( not_done ) {
1395 // invoke the callback
1396 result=func(pid, modentry.szExePath, (address)modentry.modBaseAddr,
1397 modentry.modBaseSize, param);
1398 if (result) break;
1399
1400 modentry.dwSize = sizeof(MODULEENTRY32) ;
1401 not_done = os::Kernel32Dll::Module32Next( hSnapShot, &modentry ) != 0;
1402 }
1403
1404 CloseHandle(hSnapShot);
1405 return result;
1406 }
1407
1408 int enumerate_modules( int pid, EnumModulesCallbackFunc func, void * param )
1409 {
1410 // Get current process ID if caller doesn't provide it.
1411 if (!pid) pid = os::current_process_id();
1412
1413 if (os::win32::is_nt()) return _enumerate_modules_winnt (pid, func, param);
1414 else return _enumerate_modules_windows(pid, func, param);
1415 }
1416
1417 struct _modinfo {
1418 address addr;
1419 char* full_path; // point to a char buffer
1420 int buflen; // size of the buffer
1421 address base_addr;
1422 };
1423
1424 static int _locate_module_by_addr(int pid, char * mod_fname, address base_addr,
1425 unsigned size, void * param) {
1426 struct _modinfo *pmod = (struct _modinfo *)param;
1427 if (!pmod) return -1;
1428
1429 if (base_addr <= pmod->addr &&
1430 base_addr+size > pmod->addr) {
1431 // if a buffer is provided, copy path name to the buffer
1432 if (pmod->full_path) {
1433 jio_snprintf(pmod->full_path, pmod->buflen, "%s", mod_fname);
1434 }
1435 pmod->base_addr = base_addr;
1436 return 1;
1437 }
1438 return 0;
1439 }
1440
1441 bool os::dll_address_to_library_name(address addr, char* buf,
1442 int buflen, int* offset) {
1443 // buf is not optional, but offset is optional
1444 assert(buf != NULL, "sanity check");
1445
1446 // NOTE: the reason we don't use SymGetModuleInfo() is it doesn't always
1447 // return the full path to the DLL file, sometimes it returns path
1448 // to the corresponding PDB file (debug info); sometimes it only
1449 // returns partial path, which makes life painful.
1450
1451 struct _modinfo mi;
1452 mi.addr = addr;
1453 mi.full_path = buf;
1454 mi.buflen = buflen;
1455 int pid = os::current_process_id();
1456 if (enumerate_modules(pid, _locate_module_by_addr, (void *)&mi)) {
1457 // buf already contains path name
1458 if (offset) *offset = addr - mi.base_addr;
1459 return true;
1460 }
1461
1462 buf[0] = '\0';
1463 if (offset) *offset = -1;
1464 return false;
1465 }
1466
1467 bool os::dll_address_to_function_name(address addr, char *buf,
1468 int buflen, int *offset) {
1469 // buf is not optional, but offset is optional
1470 assert(buf != NULL, "sanity check");
1471
1472 if (Decoder::decode(addr, buf, buflen, offset)) {
1473 return true;
1474 }
1475 if (offset != NULL) *offset = -1;
1476 buf[0] = '\0';
1477 return false;
1478 }
1479
1480 // save the start and end address of jvm.dll into param[0] and param[1]
1481 static int _locate_jvm_dll(int pid, char* mod_fname, address base_addr,
1482 unsigned size, void * param) {
1483 if (!param) return -1;
1484
1485 if (base_addr <= (address)_locate_jvm_dll &&
1486 base_addr+size > (address)_locate_jvm_dll) {
1487 ((address*)param)[0] = base_addr;
1488 ((address*)param)[1] = base_addr + size;
1489 return 1;
1490 }
1491 return 0;
1492 }
1493
1494 address vm_lib_location[2]; // start and end address of jvm.dll
1495
1496 // check if addr is inside jvm.dll
1497 bool os::address_is_in_vm(address addr) {
1498 if (!vm_lib_location[0] || !vm_lib_location[1]) {
1499 int pid = os::current_process_id();
1500 if (!enumerate_modules(pid, _locate_jvm_dll, (void *)vm_lib_location)) {
1501 assert(false, "Can't find jvm module.");
1502 return false;
1503 }
1504 }
1505
1506 return (vm_lib_location[0] <= addr) && (addr < vm_lib_location[1]);
1507 }
1508
1509 // print module info; param is outputStream*
1510 static int _print_module(int pid, char* fname, address base,
1511 unsigned size, void* param) {
1512 if (!param) return -1;
1513
1514 outputStream* st = (outputStream*)param;
1515
1516 address end_addr = base + size;
1517 st->print(PTR_FORMAT " - " PTR_FORMAT " \t%s\n", base, end_addr, fname);
1518 return 0;
1519 }
1520
1521 // Loads .dll/.so and
1522 // in case of error it checks if .dll/.so was built for the
1523 // same architecture as Hotspot is running on
1524 void * os::dll_load(const char *name, char *ebuf, int ebuflen)
1525 {
1526 void * result = LoadLibrary(name);
1527 if (result != NULL)
1528 {
1529 return result;
1530 }
1531
1532 DWORD errcode = GetLastError();
1533 if (errcode == ERROR_MOD_NOT_FOUND) {
1534 strncpy(ebuf, "Can't find dependent libraries", ebuflen-1);
1535 ebuf[ebuflen-1]='\0';
1536 return NULL;
1537 }
1538
1539 // Parsing dll below
1540 // If we can read dll-info and find that dll was built
1541 // for an architecture other than Hotspot is running in
1542 // - then print to buffer "DLL was built for a different architecture"
1543 // else call os::lasterror to obtain system error message
1544
1545 // Read system error message into ebuf
1546 // It may or may not be overwritten below (in the for loop and just above)
1547 lasterror(ebuf, (size_t) ebuflen);
1548 ebuf[ebuflen-1]='\0';
1549 int file_descriptor=::open(name, O_RDONLY | O_BINARY, 0);
1550 if (file_descriptor<0)
1551 {
1552 return NULL;
1553 }
1554
1555 uint32_t signature_offset;
1556 uint16_t lib_arch=0;
1557 bool failed_to_get_lib_arch=
1558 (
1559 //Go to position 3c in the dll
1560 (os::seek_to_file_offset(file_descriptor,IMAGE_FILE_PTR_TO_SIGNATURE)<0)
1561 ||
1562 // Read loacation of signature
1563 (sizeof(signature_offset)!=
1564 (os::read(file_descriptor, (void*)&signature_offset,sizeof(signature_offset))))
1565 ||
1566 //Go to COFF File Header in dll
1567 //that is located after"signature" (4 bytes long)
1568 (os::seek_to_file_offset(file_descriptor,
1569 signature_offset+IMAGE_FILE_SIGNATURE_LENGTH)<0)
1570 ||
1571 //Read field that contains code of architecture
1572 // that dll was build for
1573 (sizeof(lib_arch)!=
1574 (os::read(file_descriptor, (void*)&lib_arch,sizeof(lib_arch))))
1575 );
1576
1577 ::close(file_descriptor);
1578 if (failed_to_get_lib_arch)
1579 {
1580 // file i/o error - report os::lasterror(...) msg
1581 return NULL;
1582 }
1583
1584 typedef struct
1585 {
1586 uint16_t arch_code;
1587 char* arch_name;
1588 } arch_t;
1589
1590 static const arch_t arch_array[]={
1591 {IMAGE_FILE_MACHINE_I386, (char*)"IA 32"},
1592 {IMAGE_FILE_MACHINE_AMD64, (char*)"AMD 64"},
1593 {IMAGE_FILE_MACHINE_IA64, (char*)"IA 64"}
1594 };
1595 #if (defined _M_IA64)
1596 static const uint16_t running_arch=IMAGE_FILE_MACHINE_IA64;
1597 #elif (defined _M_AMD64)
1598 static const uint16_t running_arch=IMAGE_FILE_MACHINE_AMD64;
1599 #elif (defined _M_IX86)
1600 static const uint16_t running_arch=IMAGE_FILE_MACHINE_I386;
1601 #else
1602 #error Method os::dll_load requires that one of following \
1603 is defined :_M_IA64,_M_AMD64 or _M_IX86
1604 #endif
1605
1606
1607 // Obtain a string for printf operation
1608 // lib_arch_str shall contain string what platform this .dll was built for
1609 // running_arch_str shall string contain what platform Hotspot was built for
1610 char *running_arch_str=NULL,*lib_arch_str=NULL;
1611 for (unsigned int i=0;i<ARRAY_SIZE(arch_array);i++)
1612 {
1613 if (lib_arch==arch_array[i].arch_code)
1614 lib_arch_str=arch_array[i].arch_name;
1615 if (running_arch==arch_array[i].arch_code)
1616 running_arch_str=arch_array[i].arch_name;
1617 }
1618
1619 assert(running_arch_str,
1620 "Didn't find runing architecture code in arch_array");
1621
1622 // If the architure is right
1623 // but some other error took place - report os::lasterror(...) msg
1624 if (lib_arch == running_arch)
1625 {
1626 return NULL;
1627 }
1628
1629 if (lib_arch_str!=NULL)
1630 {
1631 ::_snprintf(ebuf, ebuflen-1,
1632 "Can't load %s-bit .dll on a %s-bit platform",
1633 lib_arch_str,running_arch_str);
1634 }
1635 else
1636 {
1637 // don't know what architecture this dll was build for
1638 ::_snprintf(ebuf, ebuflen-1,
1639 "Can't load this .dll (machine code=0x%x) on a %s-bit platform",
1640 lib_arch,running_arch_str);
1641 }
1642
1643 return NULL;
1644 }
1645
1646
1647 void os::print_dll_info(outputStream *st) {
1648 int pid = os::current_process_id();
1649 st->print_cr("Dynamic libraries:");
1650 enumerate_modules(pid, _print_module, (void *)st);
1651 }
1652
1653 void os::print_os_info_brief(outputStream* st) {
1654 os::print_os_info(st);
1655 }
1656
1657 void os::print_os_info(outputStream* st) {
1658 st->print("OS:");
1659
1660 os::win32::print_windows_version(st);
1661 }
1662
1663 void os::win32::print_windows_version(outputStream* st) {
1664 OSVERSIONINFOEX osvi;
1665 VS_FIXEDFILEINFO *file_info;
1666 TCHAR kernel32_path[MAX_PATH];
1667 UINT len, ret;
1668
1669 // Use the GetVersionEx information to see if we're on a server or
1670 // workstation edition of Windows. Starting with Windows 8.1 we can't
1671 // trust the OS version information returned by this API.
1672 ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
1673 osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
1674 if (!GetVersionEx((OSVERSIONINFO *)&osvi)) {
1675 st->print_cr("Call to GetVersionEx failed");
1676 return;
1677 }
1678 bool is_workstation = (osvi.wProductType == VER_NT_WORKSTATION);
1679
1680 // Get the full path to \Windows\System32\kernel32.dll and use that for
1681 // determining what version of Windows we're running on.
1682 len = MAX_PATH - (UINT)strlen("\\kernel32.dll") - 1;
1683 ret = GetSystemDirectory(kernel32_path, len);
1684 if (ret == 0 || ret > len) {
1685 st->print_cr("Call to GetSystemDirectory failed");
1686 return;
1687 }
1688 strncat(kernel32_path, "\\kernel32.dll", MAX_PATH - ret);
1689
1690 DWORD version_size = GetFileVersionInfoSize(kernel32_path, NULL);
1691 if (version_size == 0) {
1692 st->print_cr("Call to GetFileVersionInfoSize failed");
1693 return;
1694 }
1695
1696 LPTSTR version_info = (LPTSTR)os::malloc(version_size, mtInternal);
1697 if (version_info == NULL) {
1698 st->print_cr("Failed to allocate version_info");
1699 return;
1700 }
1701
1702 if (!GetFileVersionInfo(kernel32_path, NULL, version_size, version_info)) {
1703 os::free(version_info);
1704 st->print_cr("Call to GetFileVersionInfo failed");
1705 return;
1706 }
1707
1708 if (!VerQueryValue(version_info, TEXT("\\"), (LPVOID*)&file_info, &len)) {
1709 os::free(version_info);
1710 st->print_cr("Call to VerQueryValue failed");
1711 return;
1712 }
1713
1714 int major_version = HIWORD(file_info->dwProductVersionMS);
1715 int minor_version = LOWORD(file_info->dwProductVersionMS);
1716 int build_number = HIWORD(file_info->dwProductVersionLS);
1717 int build_minor = LOWORD(file_info->dwProductVersionLS);
1718 int os_vers = major_version * 1000 + minor_version;
1719 os::free(version_info);
1720
1721 st->print(" Windows ");
1722 switch (os_vers) {
1723
1724 case 6000:
1725 if (is_workstation) {
1726 st->print("Vista");
1727 } else {
1728 st->print("Server 2008");
1729 }
1730 break;
1731
1732 case 6001:
1733 if (is_workstation) {
1734 st->print("7");
1735 } else {
1736 st->print("Server 2008 R2");
1737 }
1738 break;
1739
1740 case 6002:
1741 if (is_workstation) {
1742 st->print("8");
1743 } else {
1744 st->print("Server 2012");
1745 }
1746 break;
1747
1748 case 6003:
1749 if (is_workstation) {
1750 st->print("8.1");
1751 } else {
1752 st->print("Server 2012 R2");
1753 }
1754 break;
1755
1756 case 6004:
1757 if (is_workstation) {
1758 st->print("10");
1759 } else {
1760 st->print("Server 2016");
1761 }
1762 break;
1763
1764 default:
1765 // Unrecognized windows, print out its major and minor versions
1766 st->print("%d.%d", major_version, minor_version);
1767 break;
1768 }
1769
1770 // Retrieve SYSTEM_INFO from GetNativeSystemInfo call so that we could
1771 // find out whether we are running on 64 bit processor or not
1772 SYSTEM_INFO si;
1773 ZeroMemory(&si, sizeof(SYSTEM_INFO));
1774 os::Kernel32Dll::GetNativeSystemInfo(&si);
1775 if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) {
1776 st->print(" , 64 bit");
1777 }
1778
1779 st->print(" Build %d", build_number);
1780 st->print(" (%d.%d.%d.%d)", major_version, minor_version, build_number, build_minor);
1781 st->cr();
1782 }
1783
1784 void os::pd_print_cpu_info(outputStream* st) {
1785 // Nothing to do for now.
1786 }
1787
1788 void os::print_memory_info(outputStream* st) {
1789 st->print("Memory:");
1790 st->print(" %dk page", os::vm_page_size()>>10);
1791
1792 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
1793 // value if total memory is larger than 4GB
1794 MEMORYSTATUSEX ms;
1795 ms.dwLength = sizeof(ms);
1796 GlobalMemoryStatusEx(&ms);
1797
1798 st->print(", physical %uk", os::physical_memory() >> 10);
1799 st->print("(%uk free)", os::available_memory() >> 10);
1800
1801 st->print(", swap %uk", ms.ullTotalPageFile >> 10);
1802 st->print("(%uk free)", ms.ullAvailPageFile >> 10);
1803 st->cr();
1804 }
1805
1806 void os::print_siginfo(outputStream *st, void *siginfo) {
1807 EXCEPTION_RECORD* er = (EXCEPTION_RECORD*)siginfo;
1808 st->print("siginfo:");
1809 st->print(" ExceptionCode=0x%x", er->ExceptionCode);
1810
1811 if (er->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
1812 er->NumberParameters >= 2) {
1813 switch (er->ExceptionInformation[0]) {
1814 case 0: st->print(", reading address"); break;
1815 case 1: st->print(", writing address"); break;
1816 default: st->print(", ExceptionInformation=" INTPTR_FORMAT,
1817 er->ExceptionInformation[0]);
1818 }
1819 st->print(" " INTPTR_FORMAT, er->ExceptionInformation[1]);
1820 } else if (er->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
1821 er->NumberParameters >= 2 && UseSharedSpaces) {
1822 FileMapInfo* mapinfo = FileMapInfo::current_info();
1823 if (mapinfo->is_in_shared_space((void*)er->ExceptionInformation[1])) {
1824 st->print("\n\nError accessing class data sharing archive." \
1825 " Mapped file inaccessible during execution, " \
1826 " possible disk/network problem.");
1827 }
1828 } else {
1829 int num = er->NumberParameters;
1830 if (num > 0) {
1831 st->print(", ExceptionInformation=");
1832 for (int i = 0; i < num; i++) {
1833 st->print(INTPTR_FORMAT " ", er->ExceptionInformation[i]);
1834 }
1835 }
1836 }
1837 st->cr();
1838 }
1839
1840 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1841 // do nothing
1842 }
1843
1844 static char saved_jvm_path[MAX_PATH] = {0};
1845
1846 // Find the full path to the current module, jvm.dll
1847 void os::jvm_path(char *buf, jint buflen) {
1848 // Error checking.
1849 if (buflen < MAX_PATH) {
1850 assert(false, "must use a large-enough buffer");
1851 buf[0] = '\0';
1852 return;
1853 }
1854 // Lazy resolve the path to current module.
1855 if (saved_jvm_path[0] != 0) {
1856 strcpy(buf, saved_jvm_path);
1857 return;
1858 }
1859
1860 buf[0] = '\0';
1861 if (Arguments::created_by_gamma_launcher()) {
1862 // Support for the gamma launcher. Check for an
1863 // JAVA_HOME environment variable
1864 // and fix up the path so it looks like
1865 // libjvm.so is installed there (append a fake suffix
1866 // hotspot/libjvm.so).
1867 char* java_home_var = ::getenv("JAVA_HOME");
1868 if (java_home_var != NULL && java_home_var[0] != 0 &&
1869 strlen(java_home_var) < (size_t)buflen) {
1870
1871 strncpy(buf, java_home_var, buflen);
1872
1873 // determine if this is a legacy image or modules image
1874 // modules image doesn't have "jre" subdirectory
1875 size_t len = strlen(buf);
1876 char* jrebin_p = buf + len;
1877 jio_snprintf(jrebin_p, buflen-len, "\\jre\\bin\\");
1878 if (0 != _access(buf, 0)) {
1879 jio_snprintf(jrebin_p, buflen-len, "\\bin\\");
1880 }
1881 len = strlen(buf);
1882 jio_snprintf(buf + len, buflen-len, "hotspot\\jvm.dll");
1883 }
1884 }
1885
1886 if(buf[0] == '\0') {
1887 GetModuleFileName(vm_lib_handle, buf, buflen);
1888 }
1889 strncpy(saved_jvm_path, buf, MAX_PATH);
1890 }
1891
1892
1893 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1894 #ifndef _WIN64
1895 st->print("_");
1896 #endif
1897 }
1898
1899
1900 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1901 #ifndef _WIN64
1902 st->print("@%d", args_size * sizeof(int));
1903 #endif
1904 }
1905
1906 // This method is a copy of JDK's sysGetLastErrorString
1907 // from src/windows/hpi/src/system_md.c
1908
1909 size_t os::lasterror(char* buf, size_t len) {
1910 DWORD errval;
1911
1912 if ((errval = GetLastError()) != 0) {
1913 // DOS error
1914 size_t n = (size_t)FormatMessage(
1915 FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
1916 NULL,
1917 errval,
1918 0,
1919 buf,
1920 (DWORD)len,
1921 NULL);
1922 if (n > 3) {
1923 // Drop final '.', CR, LF
1924 if (buf[n - 1] == '\n') n--;
1925 if (buf[n - 1] == '\r') n--;
1926 if (buf[n - 1] == '.') n--;
1927 buf[n] = '\0';
1928 }
1929 return n;
1930 }
1931
1932 if (errno != 0) {
1933 // C runtime error that has no corresponding DOS error code
1934 const char* s = strerror(errno);
1935 size_t n = strlen(s);
1936 if (n >= len) n = len - 1;
1937 strncpy(buf, s, n);
1938 buf[n] = '\0';
1939 return n;
1940 }
1941
1942 return 0;
1943 }
1944
1945 int os::get_last_error() {
1946 DWORD error = GetLastError();
1947 if (error == 0)
1948 error = errno;
1949 return (int)error;
1950 }
1951
1952 // sun.misc.Signal
1953 // NOTE that this is a workaround for an apparent kernel bug where if
1954 // a signal handler for SIGBREAK is installed then that signal handler
1955 // takes priority over the console control handler for CTRL_CLOSE_EVENT.
1956 // See bug 4416763.
1957 static void (*sigbreakHandler)(int) = NULL;
1958
1959 static void UserHandler(int sig, void *siginfo, void *context) {
1960 os::signal_notify(sig);
1961 // We need to reinstate the signal handler each time...
1962 os::signal(sig, (void*)UserHandler);
1963 }
1964
1965 void* os::user_handler() {
1966 return (void*) UserHandler;
1967 }
1968
1969 void* os::signal(int signal_number, void* handler) {
1970 if ((signal_number == SIGBREAK) && (!ReduceSignalUsage)) {
1971 void (*oldHandler)(int) = sigbreakHandler;
1972 sigbreakHandler = (void (*)(int)) handler;
1973 return (void*) oldHandler;
1974 } else {
1975 return (void*)::signal(signal_number, (void (*)(int))handler);
1976 }
1977 }
1978
1979 void os::signal_raise(int signal_number) {
1980 raise(signal_number);
1981 }
1982
1983 // The Win32 C runtime library maps all console control events other than ^C
1984 // into SIGBREAK, which makes it impossible to distinguish ^BREAK from close,
1985 // logoff, and shutdown events. We therefore install our own console handler
1986 // that raises SIGTERM for the latter cases.
1987 //
1988 static BOOL WINAPI consoleHandler(DWORD event) {
1989 switch(event) {
1990 case CTRL_C_EVENT:
1991 if (is_error_reported()) {
1992 // Ctrl-C is pressed during error reporting, likely because the error
1993 // handler fails to abort. Let VM die immediately.
1994 os::die();
1995 }
1996
1997 os::signal_raise(SIGINT);
1998 return TRUE;
1999 break;
2000 case CTRL_BREAK_EVENT:
2001 if (sigbreakHandler != NULL) {
2002 (*sigbreakHandler)(SIGBREAK);
2003 }
2004 return TRUE;
2005 break;
2006 case CTRL_LOGOFF_EVENT: {
2007 // Don't terminate JVM if it is running in a non-interactive session,
2008 // such as a service process.
2009 USEROBJECTFLAGS flags;
2010 HANDLE handle = GetProcessWindowStation();
2011 if (handle != NULL &&
2012 GetUserObjectInformation(handle, UOI_FLAGS, &flags,
2013 sizeof( USEROBJECTFLAGS), NULL)) {
2014 // If it is a non-interactive session, let next handler to deal
2015 // with it.
2016 if ((flags.dwFlags & WSF_VISIBLE) == 0) {
2017 return FALSE;
2018 }
2019 }
2020 }
2021 case CTRL_CLOSE_EVENT:
2022 case CTRL_SHUTDOWN_EVENT:
2023 os::signal_raise(SIGTERM);
2024 return TRUE;
2025 break;
2026 default:
2027 break;
2028 }
2029 return FALSE;
2030 }
2031
2032 /*
2033 * The following code is moved from os.cpp for making this
2034 * code platform specific, which it is by its very nature.
2035 */
2036
2037 // Return maximum OS signal used + 1 for internal use only
2038 // Used as exit signal for signal_thread
2039 int os::sigexitnum_pd(){
2040 return NSIG;
2041 }
2042
2043 // a counter for each possible signal value, including signal_thread exit signal
2044 static volatile jint pending_signals[NSIG+1] = { 0 };
2045 static HANDLE sig_sem = NULL;
2046
2047 void os::signal_init_pd() {
2048 // Initialize signal structures
2049 memset((void*)pending_signals, 0, sizeof(pending_signals));
2050
2051 sig_sem = ::CreateSemaphore(NULL, 0, NSIG+1, NULL);
2052
2053 // Programs embedding the VM do not want it to attempt to receive
2054 // events like CTRL_LOGOFF_EVENT, which are used to implement the
2055 // shutdown hooks mechanism introduced in 1.3. For example, when
2056 // the VM is run as part of a Windows NT service (i.e., a servlet
2057 // engine in a web server), the correct behavior is for any console
2058 // control handler to return FALSE, not TRUE, because the OS's
2059 // "final" handler for such events allows the process to continue if
2060 // it is a service (while terminating it if it is not a service).
2061 // To make this behavior uniform and the mechanism simpler, we
2062 // completely disable the VM's usage of these console events if -Xrs
2063 // (=ReduceSignalUsage) is specified. This means, for example, that
2064 // the CTRL-BREAK thread dump mechanism is also disabled in this
2065 // case. See bugs 4323062, 4345157, and related bugs.
2066
2067 if (!ReduceSignalUsage) {
2068 // Add a CTRL-C handler
2069 SetConsoleCtrlHandler(consoleHandler, TRUE);
2070 }
2071 }
2072
2073 void os::signal_notify(int signal_number) {
2074 BOOL ret;
2075 if (sig_sem != NULL) {
2076 Atomic::inc(&pending_signals[signal_number]);
2077 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2078 assert(ret != 0, "ReleaseSemaphore() failed");
2079 }
2080 }
2081
2082 static int check_pending_signals(bool wait_for_signal) {
2083 DWORD ret;
2084 while (true) {
2085 for (int i = 0; i < NSIG + 1; i++) {
2086 jint n = pending_signals[i];
2087 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2088 return i;
2089 }
2090 }
2091 if (!wait_for_signal) {
2092 return -1;
2093 }
2094
2095 JavaThread *thread = JavaThread::current();
2096
2097 ThreadBlockInVM tbivm(thread);
2098
2099 bool threadIsSuspended;
2100 do {
2101 thread->set_suspend_equivalent();
2102 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2103 ret = ::WaitForSingleObject(sig_sem, INFINITE);
2104 assert(ret == WAIT_OBJECT_0, "WaitForSingleObject() failed");
2105
2106 // were we externally suspended while we were waiting?
2107 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2108 if (threadIsSuspended) {
2109 //
2110 // The semaphore has been incremented, but while we were waiting
2111 // another thread suspended us. We don't want to continue running
2112 // while suspended because that would surprise the thread that
2113 // suspended us.
2114 //
2115 ret = ::ReleaseSemaphore(sig_sem, 1, NULL);
2116 assert(ret != 0, "ReleaseSemaphore() failed");
2117
2118 thread->java_suspend_self();
2119 }
2120 } while (threadIsSuspended);
2121 }
2122 }
2123
2124 int os::signal_lookup() {
2125 return check_pending_signals(false);
2126 }
2127
2128 int os::signal_wait() {
2129 return check_pending_signals(true);
2130 }
2131
2132 // Implicit OS exception handling
2133
2134 LONG Handle_Exception(struct _EXCEPTION_POINTERS* exceptionInfo, address handler) {
2135 JavaThread* thread = JavaThread::current();
2136 // Save pc in thread
2137 #ifdef _M_IA64
2138 // Do not blow up if no thread info available.
2139 if (thread) {
2140 // Saving PRECISE pc (with slot information) in thread.
2141 uint64_t precise_pc = (uint64_t) exceptionInfo->ExceptionRecord->ExceptionAddress;
2142 // Convert precise PC into "Unix" format
2143 precise_pc = (precise_pc & 0xFFFFFFFFFFFFFFF0) | ((precise_pc & 0xF) >> 2);
2144 thread->set_saved_exception_pc((address)precise_pc);
2145 }
2146 // Set pc to handler
2147 exceptionInfo->ContextRecord->StIIP = (DWORD64)handler;
2148 // Clear out psr.ri (= Restart Instruction) in order to continue
2149 // at the beginning of the target bundle.
2150 exceptionInfo->ContextRecord->StIPSR &= 0xFFFFF9FFFFFFFFFF;
2151 assert(((DWORD64)handler & 0xF) == 0, "Target address must point to the beginning of a bundle!");
2152 #else
2153 #ifdef _M_AMD64
2154 // Do not blow up if no thread info available.
2155 if (thread) {
2156 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Rip);
2157 }
2158 // Set pc to handler
2159 exceptionInfo->ContextRecord->Rip = (DWORD64)handler;
2160 #else
2161 // Do not blow up if no thread info available.
2162 if (thread) {
2163 thread->set_saved_exception_pc((address)(DWORD_PTR)exceptionInfo->ContextRecord->Eip);
2164 }
2165 // Set pc to handler
2166 exceptionInfo->ContextRecord->Eip = (DWORD)(DWORD_PTR)handler;
2167 #endif
2168 #endif
2169
2170 // Continue the execution
2171 return EXCEPTION_CONTINUE_EXECUTION;
2172 }
2173
2174
2175 // Used for PostMortemDump
2176 extern "C" void safepoints();
2177 extern "C" void find(int x);
2178 extern "C" void events();
2179
2180 // According to Windows API documentation, an illegal instruction sequence should generate
2181 // the 0xC000001C exception code. However, real world experience shows that occasionnaly
2182 // the execution of an illegal instruction can generate the exception code 0xC000001E. This
2183 // seems to be an undocumented feature of Win NT 4.0 (and probably other Windows systems).
2184
2185 #define EXCEPTION_ILLEGAL_INSTRUCTION_2 0xC000001E
2186
2187 // From "Execution Protection in the Windows Operating System" draft 0.35
2188 // Once a system header becomes available, the "real" define should be
2189 // included or copied here.
2190 #define EXCEPTION_INFO_EXEC_VIOLATION 0x08
2191
2192 // Handle NAT Bit consumption on IA64.
2193 #ifdef _M_IA64
2194 #define EXCEPTION_REG_NAT_CONSUMPTION STATUS_REG_NAT_CONSUMPTION
2195 #endif
2196
2197 // Windows Vista/2008 heap corruption check
2198 #define EXCEPTION_HEAP_CORRUPTION 0xC0000374
2199
2200 #define def_excpt(val) #val, val
2201
2202 struct siglabel {
2203 char *name;
2204 int number;
2205 };
2206
2207 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
2208 // C++ compiler contain this error code. Because this is a compiler-generated
2209 // error, the code is not listed in the Win32 API header files.
2210 // The code is actually a cryptic mnemonic device, with the initial "E"
2211 // standing for "exception" and the final 3 bytes (0x6D7363) representing the
2212 // ASCII values of "msc".
2213
2214 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION 0xE06D7363
2215
2216
2217 struct siglabel exceptlabels[] = {
2218 def_excpt(EXCEPTION_ACCESS_VIOLATION),
2219 def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
2220 def_excpt(EXCEPTION_BREAKPOINT),
2221 def_excpt(EXCEPTION_SINGLE_STEP),
2222 def_excpt(EXCEPTION_ARRAY_BOUNDS_EXCEEDED),
2223 def_excpt(EXCEPTION_FLT_DENORMAL_OPERAND),
2224 def_excpt(EXCEPTION_FLT_DIVIDE_BY_ZERO),
2225 def_excpt(EXCEPTION_FLT_INEXACT_RESULT),
2226 def_excpt(EXCEPTION_FLT_INVALID_OPERATION),
2227 def_excpt(EXCEPTION_FLT_OVERFLOW),
2228 def_excpt(EXCEPTION_FLT_STACK_CHECK),
2229 def_excpt(EXCEPTION_FLT_UNDERFLOW),
2230 def_excpt(EXCEPTION_INT_DIVIDE_BY_ZERO),
2231 def_excpt(EXCEPTION_INT_OVERFLOW),
2232 def_excpt(EXCEPTION_PRIV_INSTRUCTION),
2233 def_excpt(EXCEPTION_IN_PAGE_ERROR),
2234 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION),
2235 def_excpt(EXCEPTION_ILLEGAL_INSTRUCTION_2),
2236 def_excpt(EXCEPTION_NONCONTINUABLE_EXCEPTION),
2237 def_excpt(EXCEPTION_STACK_OVERFLOW),
2238 def_excpt(EXCEPTION_INVALID_DISPOSITION),
2239 def_excpt(EXCEPTION_GUARD_PAGE),
2240 def_excpt(EXCEPTION_INVALID_HANDLE),
2241 def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
2242 def_excpt(EXCEPTION_HEAP_CORRUPTION),
2243 #ifdef _M_IA64
2244 def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
2245 #endif
2246 NULL, 0
2247 };
2248
2249 const char* os::exception_name(int exception_code, char *buf, size_t size) {
2250 for (int i = 0; exceptlabels[i].name != NULL; i++) {
2251 if (exceptlabels[i].number == exception_code) {
2252 jio_snprintf(buf, size, "%s", exceptlabels[i].name);
2253 return buf;
2254 }
2255 }
2256
2257 return NULL;
2258 }
2259
2260 //-----------------------------------------------------------------------------
2261 LONG Handle_IDiv_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2262 // handle exception caused by idiv; should only happen for -MinInt/-1
2263 // (division by zero is handled explicitly)
2264 #ifdef _M_IA64
2265 assert(0, "Fix Handle_IDiv_Exception");
2266 #else
2267 #ifdef _M_AMD64
2268 PCONTEXT ctx = exceptionInfo->ContextRecord;
2269 address pc = (address)ctx->Rip;
2270 assert(pc[0] == 0xF7, "not an idiv opcode");
2271 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2272 assert(ctx->Rax == min_jint, "unexpected idiv exception");
2273 // set correct result values and continue after idiv instruction
2274 ctx->Rip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2275 ctx->Rax = (DWORD)min_jint; // result
2276 ctx->Rdx = (DWORD)0; // remainder
2277 // Continue the execution
2278 #else
2279 PCONTEXT ctx = exceptionInfo->ContextRecord;
2280 address pc = (address)ctx->Eip;
2281 assert(pc[0] == 0xF7, "not an idiv opcode");
2282 assert((pc[1] & ~0x7) == 0xF8, "cannot handle non-register operands");
2283 assert(ctx->Eax == min_jint, "unexpected idiv exception");
2284 // set correct result values and continue after idiv instruction
2285 ctx->Eip = (DWORD)pc + 2; // idiv reg, reg is 2 bytes
2286 ctx->Eax = (DWORD)min_jint; // result
2287 ctx->Edx = (DWORD)0; // remainder
2288 // Continue the execution
2289 #endif
2290 #endif
2291 return EXCEPTION_CONTINUE_EXECUTION;
2292 }
2293
2294 #ifndef _WIN64
2295 //-----------------------------------------------------------------------------
2296 LONG WINAPI Handle_FLT_Exception(struct _EXCEPTION_POINTERS* exceptionInfo) {
2297 // handle exception caused by native method modifying control word
2298 PCONTEXT ctx = exceptionInfo->ContextRecord;
2299 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2300
2301 switch (exception_code) {
2302 case EXCEPTION_FLT_DENORMAL_OPERAND:
2303 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
2304 case EXCEPTION_FLT_INEXACT_RESULT:
2305 case EXCEPTION_FLT_INVALID_OPERATION:
2306 case EXCEPTION_FLT_OVERFLOW:
2307 case EXCEPTION_FLT_STACK_CHECK:
2308 case EXCEPTION_FLT_UNDERFLOW:
2309 jint fp_control_word = (* (jint*) StubRoutines::addr_fpu_cntrl_wrd_std());
2310 if (fp_control_word != ctx->FloatSave.ControlWord) {
2311 // Restore FPCW and mask out FLT exceptions
2312 ctx->FloatSave.ControlWord = fp_control_word | 0xffffffc0;
2313 // Mask out pending FLT exceptions
2314 ctx->FloatSave.StatusWord &= 0xffffff00;
2315 return EXCEPTION_CONTINUE_EXECUTION;
2316 }
2317 }
2318
2319 if (prev_uef_handler != NULL) {
2320 // We didn't handle this exception so pass it to the previous
2321 // UnhandledExceptionFilter.
2322 return (prev_uef_handler)(exceptionInfo);
2323 }
2324
2325 return EXCEPTION_CONTINUE_SEARCH;
2326 }
2327 #else //_WIN64
2328 /*
2329 On Windows, the mxcsr control bits are non-volatile across calls
2330 See also CR 6192333
2331 If EXCEPTION_FLT_* happened after some native method modified
2332 mxcsr - it is not a jvm fault.
2333 However should we decide to restore of mxcsr after a faulty
2334 native method we can uncomment following code
2335 jint MxCsr = INITIAL_MXCSR;
2336 // we can't use StubRoutines::addr_mxcsr_std()
2337 // because in Win64 mxcsr is not saved there
2338 if (MxCsr != ctx->MxCsr) {
2339 ctx->MxCsr = MxCsr;
2340 return EXCEPTION_CONTINUE_EXECUTION;
2341 }
2342
2343 */
2344 #endif // _WIN64
2345
2346
2347 static inline void report_error(Thread* t, DWORD exception_code,
2348 address addr, void* siginfo, void* context) {
2349 VMError err(t, exception_code, addr, siginfo, context);
2350 err.report_and_die();
2351
2352 // If UseOsErrorReporting, this will return here and save the error file
2353 // somewhere where we can find it in the minidump.
2354 }
2355
2356 //-----------------------------------------------------------------------------
2357 LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2358 if (InterceptOSException) return EXCEPTION_CONTINUE_SEARCH;
2359 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2360 #ifdef _M_IA64
2361 // On Itanium, we need the "precise pc", which has the slot number coded
2362 // into the least 4 bits: 0000=slot0, 0100=slot1, 1000=slot2 (Windows format).
2363 address pc = (address) exceptionInfo->ExceptionRecord->ExceptionAddress;
2364 // Convert the pc to "Unix format", which has the slot number coded
2365 // into the least 2 bits: 0000=slot0, 0001=slot1, 0010=slot2
2366 // This is needed for IA64 because "relocation" / "implicit null check" / "poll instruction"
2367 // information is saved in the Unix format.
2368 address pc_unix_format = (address) ((((uint64_t)pc) & 0xFFFFFFFFFFFFFFF0) | ((((uint64_t)pc) & 0xF) >> 2));
2369 #else
2370 #ifdef _M_AMD64
2371 address pc = (address) exceptionInfo->ContextRecord->Rip;
2372 #else
2373 address pc = (address) exceptionInfo->ContextRecord->Eip;
2374 #endif
2375 #endif
2376 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
2377
2378 // Handle SafeFetch32 and SafeFetchN exceptions.
2379 if (StubRoutines::is_safefetch_fault(pc)) {
2380 return Handle_Exception(exceptionInfo, StubRoutines::continuation_for_safefetch_fault(pc));
2381 }
2382
2383 #ifndef _WIN64
2384 // Execution protection violation - win32 running on AMD64 only
2385 // Handled first to avoid misdiagnosis as a "normal" access violation;
2386 // This is safe to do because we have a new/unique ExceptionInformation
2387 // code for this condition.
2388 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2389 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2390 int exception_subcode = (int) exceptionRecord->ExceptionInformation[0];
2391 address addr = (address) exceptionRecord->ExceptionInformation[1];
2392
2393 if (exception_subcode == EXCEPTION_INFO_EXEC_VIOLATION) {
2394 int page_size = os::vm_page_size();
2395
2396 // Make sure the pc and the faulting address are sane.
2397 //
2398 // If an instruction spans a page boundary, and the page containing
2399 // the beginning of the instruction is executable but the following
2400 // page is not, the pc and the faulting address might be slightly
2401 // different - we still want to unguard the 2nd page in this case.
2402 //
2403 // 15 bytes seems to be a (very) safe value for max instruction size.
2404 bool pc_is_near_addr =
2405 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
2406 bool instr_spans_page_boundary =
2407 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
2408 (intptr_t) page_size) > 0);
2409
2410 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
2411 static volatile address last_addr =
2412 (address) os::non_memory_address_word();
2413
2414 // In conservative mode, don't unguard unless the address is in the VM
2415 if (UnguardOnExecutionViolation > 0 && addr != last_addr &&
2416 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
2417
2418 // Set memory to RWX and retry
2419 address page_start =
2420 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
2421 bool res = os::protect_memory((char*) page_start, page_size,
2422 os::MEM_PROT_RWX);
2423
2424 if (PrintMiscellaneous && Verbose) {
2425 char buf[256];
2426 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
2427 "at " INTPTR_FORMAT
2428 ", unguarding " INTPTR_FORMAT ": %s", addr,
2429 page_start, (res ? "success" : strerror(errno)));
2430 tty->print_raw_cr(buf);
2431 }
2432
2433 // Set last_addr so if we fault again at the same address, we don't
2434 // end up in an endless loop.
2435 //
2436 // There are two potential complications here. Two threads trapping
2437 // at the same address at the same time could cause one of the
2438 // threads to think it already unguarded, and abort the VM. Likely
2439 // very rare.
2440 //
2441 // The other race involves two threads alternately trapping at
2442 // different addresses and failing to unguard the page, resulting in
2443 // an endless loop. This condition is probably even more unlikely
2444 // than the first.
2445 //
2446 // Although both cases could be avoided by using locks or thread
2447 // local last_addr, these solutions are unnecessary complication:
2448 // this handler is a best-effort safety net, not a complete solution.
2449 // It is disabled by default and should only be used as a workaround
2450 // in case we missed any no-execute-unsafe VM code.
2451
2452 last_addr = addr;
2453
2454 return EXCEPTION_CONTINUE_EXECUTION;
2455 }
2456 }
2457
2458 // Last unguard failed or not unguarding
2459 tty->print_raw_cr("Execution protection violation");
2460 report_error(t, exception_code, addr, exceptionInfo->ExceptionRecord,
2461 exceptionInfo->ContextRecord);
2462 return EXCEPTION_CONTINUE_SEARCH;
2463 }
2464 }
2465 #endif // _WIN64
2466
2467 // Check to see if we caught the safepoint code in the
2468 // process of write protecting the memory serialization page.
2469 // It write enables the page immediately after protecting it
2470 // so just return.
2471 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
2472 JavaThread* thread = (JavaThread*) t;
2473 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2474 address addr = (address) exceptionRecord->ExceptionInformation[1];
2475 if ( os::is_memory_serialize_page(thread, addr) ) {
2476 // Block current thread until the memory serialize page permission restored.
2477 os::block_on_serialize_page_trap();
2478 return EXCEPTION_CONTINUE_EXECUTION;
2479 }
2480 }
2481
2482 if ((exception_code == EXCEPTION_ACCESS_VIOLATION) &&
2483 VM_Version::is_cpuinfo_segv_addr(pc)) {
2484 // Verify that OS save/restore AVX registers.
2485 return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
2486 }
2487
2488 if (t != NULL && t->is_Java_thread()) {
2489 JavaThread* thread = (JavaThread*) t;
2490 bool in_java = thread->thread_state() == _thread_in_Java;
2491
2492 // Handle potential stack overflows up front.
2493 if (exception_code == EXCEPTION_STACK_OVERFLOW) {
2494 if (os::uses_stack_guard_pages()) {
2495 #ifdef _M_IA64
2496 // Use guard page for register stack.
2497 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2498 address addr = (address) exceptionRecord->ExceptionInformation[1];
2499 // Check for a register stack overflow on Itanium
2500 if (thread->addr_inside_register_stack_red_zone(addr)) {
2501 // Fatal red zone violation happens if the Java program
2502 // catches a StackOverflow error and does so much processing
2503 // that it runs beyond the unprotected yellow guard zone. As
2504 // a result, we are out of here.
2505 fatal("ERROR: Unrecoverable stack overflow happened. JVM will exit.");
2506 } else if(thread->addr_inside_register_stack(addr)) {
2507 // Disable the yellow zone which sets the state that
2508 // we've got a stack overflow problem.
2509 if (thread->stack_yellow_zone_enabled()) {
2510 thread->disable_stack_yellow_zone();
2511 }
2512 // Give us some room to process the exception.
2513 thread->disable_register_stack_guard();
2514 // Tracing with +Verbose.
2515 if (Verbose) {
2516 tty->print_cr("SOF Compiled Register Stack overflow at " INTPTR_FORMAT " (SIGSEGV)", pc);
2517 tty->print_cr("Register Stack access at " INTPTR_FORMAT, addr);
2518 tty->print_cr("Register Stack base " INTPTR_FORMAT, thread->register_stack_base());
2519 tty->print_cr("Register Stack [" INTPTR_FORMAT "," INTPTR_FORMAT "]",
2520 thread->register_stack_base(),
2521 thread->register_stack_base() + thread->stack_size());
2522 }
2523
2524 // Reguard the permanent register stack red zone just to be sure.
2525 // We saw Windows silently disabling this without telling us.
2526 thread->enable_register_stack_red_zone();
2527
2528 return Handle_Exception(exceptionInfo,
2529 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2530 }
2531 #endif
2532 if (thread->stack_yellow_zone_enabled()) {
2533 // Yellow zone violation. The o/s has unprotected the first yellow
2534 // zone page for us. Note: must call disable_stack_yellow_zone to
2535 // update the enabled status, even if the zone contains only one page.
2536 thread->disable_stack_yellow_zone();
2537 // If not in java code, return and hope for the best.
2538 return in_java ? Handle_Exception(exceptionInfo,
2539 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW))
2540 : EXCEPTION_CONTINUE_EXECUTION;
2541 } else {
2542 // Fatal red zone violation.
2543 thread->disable_stack_red_zone();
2544 tty->print_raw_cr("An unrecoverable stack overflow has occurred.");
2545 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2546 exceptionInfo->ContextRecord);
2547 return EXCEPTION_CONTINUE_SEARCH;
2548 }
2549 } else if (in_java) {
2550 // JVM-managed guard pages cannot be used on win95/98. The o/s provides
2551 // a one-time-only guard page, which it has released to us. The next
2552 // stack overflow on this thread will result in an ACCESS_VIOLATION.
2553 return Handle_Exception(exceptionInfo,
2554 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2555 } else {
2556 // Can only return and hope for the best. Further stack growth will
2557 // result in an ACCESS_VIOLATION.
2558 return EXCEPTION_CONTINUE_EXECUTION;
2559 }
2560 } else if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2561 // Either stack overflow or null pointer exception.
2562 if (in_java) {
2563 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2564 address addr = (address) exceptionRecord->ExceptionInformation[1];
2565 address stack_end = thread->stack_base() - thread->stack_size();
2566 if (addr < stack_end && addr >= stack_end - os::vm_page_size()) {
2567 // Stack overflow.
2568 assert(!os::uses_stack_guard_pages(),
2569 "should be caught by red zone code above.");
2570 return Handle_Exception(exceptionInfo,
2571 SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW));
2572 }
2573 //
2574 // Check for safepoint polling and implicit null
2575 // We only expect null pointers in the stubs (vtable)
2576 // the rest are checked explicitly now.
2577 //
2578 CodeBlob* cb = CodeCache::find_blob(pc);
2579 if (cb != NULL) {
2580 if (os::is_poll_address(addr)) {
2581 address stub = SharedRuntime::get_poll_stub(pc);
2582 return Handle_Exception(exceptionInfo, stub);
2583 }
2584 }
2585 {
2586 #ifdef _WIN64
2587 //
2588 // If it's a legal stack address map the entire region in
2589 //
2590 PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;
2591 address addr = (address) exceptionRecord->ExceptionInformation[1];
2592 if (addr > thread->stack_yellow_zone_base() && addr < thread->stack_base() ) {
2593 addr = (address)((uintptr_t)addr &
2594 (~((uintptr_t)os::vm_page_size() - (uintptr_t)1)));
2595 os::commit_memory((char *)addr, thread->stack_base() - addr,
2596 !ExecMem);
2597 return EXCEPTION_CONTINUE_EXECUTION;
2598 }
2599 else
2600 #endif
2601 {
2602 // Null pointer exception.
2603 #ifdef _M_IA64
2604 // Process implicit null checks in compiled code. Note: Implicit null checks
2605 // can happen even if "ImplicitNullChecks" is disabled, e.g. in vtable stubs.
2606 if (CodeCache::contains((void*) pc_unix_format) && !MacroAssembler::needs_explicit_null_check((intptr_t) addr)) {
2607 CodeBlob *cb = CodeCache::find_blob_unsafe(pc_unix_format);
2608 // Handle implicit null check in UEP method entry
2609 if (cb && (cb->is_frame_complete_at(pc) ||
2610 (cb->is_nmethod() && ((nmethod *)cb)->inlinecache_check_contains(pc)))) {
2611 if (Verbose) {
2612 intptr_t *bundle_start = (intptr_t*) ((intptr_t) pc_unix_format & 0xFFFFFFFFFFFFFFF0);
2613 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc_unix_format);
2614 tty->print_cr(" to addr " INTPTR_FORMAT, addr);
2615 tty->print_cr(" bundle is " INTPTR_FORMAT " (high), " INTPTR_FORMAT " (low)",
2616 *(bundle_start + 1), *bundle_start);
2617 }
2618 return Handle_Exception(exceptionInfo,
2619 SharedRuntime::continuation_for_implicit_exception(thread, pc_unix_format, SharedRuntime::IMPLICIT_NULL));
2620 }
2621 }
2622
2623 // Implicit null checks were processed above. Hence, we should not reach
2624 // here in the usual case => die!
2625 if (Verbose) tty->print_raw_cr("Access violation, possible null pointer exception");
2626 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2627 exceptionInfo->ContextRecord);
2628 return EXCEPTION_CONTINUE_SEARCH;
2629
2630 #else // !IA64
2631
2632 // Windows 98 reports faulting addresses incorrectly
2633 if (!MacroAssembler::needs_explicit_null_check((intptr_t)addr) ||
2634 !os::win32::is_nt()) {
2635 address stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
2636 if (stub != NULL) return Handle_Exception(exceptionInfo, stub);
2637 }
2638 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2639 exceptionInfo->ContextRecord);
2640 return EXCEPTION_CONTINUE_SEARCH;
2641 #endif
2642 }
2643 }
2644 }
2645
2646 #ifdef _WIN64
2647 // Special care for fast JNI field accessors.
2648 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks
2649 // in and the heap gets shrunk before the field access.
2650 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2651 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2652 if (addr != (address)-1) {
2653 return Handle_Exception(exceptionInfo, addr);
2654 }
2655 }
2656 #endif
2657
2658 // Stack overflow or null pointer exception in native code.
2659 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2660 exceptionInfo->ContextRecord);
2661 return EXCEPTION_CONTINUE_SEARCH;
2662 } // /EXCEPTION_ACCESS_VIOLATION
2663 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2664 #if defined _M_IA64
2665 else if ((exception_code == EXCEPTION_ILLEGAL_INSTRUCTION ||
2666 exception_code == EXCEPTION_ILLEGAL_INSTRUCTION_2)) {
2667 M37 handle_wrong_method_break(0, NativeJump::HANDLE_WRONG_METHOD, PR0);
2668
2669 // Compiled method patched to be non entrant? Following conditions must apply:
2670 // 1. must be first instruction in bundle
2671 // 2. must be a break instruction with appropriate code
2672 if((((uint64_t) pc & 0x0F) == 0) &&
2673 (((IPF_Bundle*) pc)->get_slot0() == handle_wrong_method_break.bits())) {
2674 return Handle_Exception(exceptionInfo,
2675 (address)SharedRuntime::get_handle_wrong_method_stub());
2676 }
2677 } // /EXCEPTION_ILLEGAL_INSTRUCTION
2678 #endif
2679
2680
2681 if (in_java) {
2682 switch (exception_code) {
2683 case EXCEPTION_INT_DIVIDE_BY_ZERO:
2684 return Handle_Exception(exceptionInfo, SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO));
2685
2686 case EXCEPTION_INT_OVERFLOW:
2687 return Handle_IDiv_Exception(exceptionInfo);
2688
2689 } // switch
2690 }
2691 #ifndef _WIN64
2692 if (((thread->thread_state() == _thread_in_Java) ||
2693 (thread->thread_state() == _thread_in_native)) &&
2694 exception_code != EXCEPTION_UNCAUGHT_CXX_EXCEPTION)
2695 {
2696 LONG result=Handle_FLT_Exception(exceptionInfo);
2697 if (result==EXCEPTION_CONTINUE_EXECUTION) return result;
2698 }
2699 #endif //_WIN64
2700 }
2701
2702 if (exception_code != EXCEPTION_BREAKPOINT) {
2703 report_error(t, exception_code, pc, exceptionInfo->ExceptionRecord,
2704 exceptionInfo->ContextRecord);
2705 }
2706 return EXCEPTION_CONTINUE_SEARCH;
2707 }
2708
2709 #ifndef _WIN64
2710 // Special care for fast JNI accessors.
2711 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in and
2712 // the heap gets shrunk before the field access.
2713 // Need to install our own structured exception handler since native code may
2714 // install its own.
2715 LONG WINAPI fastJNIAccessorExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
2716 DWORD exception_code = exceptionInfo->ExceptionRecord->ExceptionCode;
2717 if (exception_code == EXCEPTION_ACCESS_VIOLATION) {
2718 address pc = (address) exceptionInfo->ContextRecord->Eip;
2719 address addr = JNI_FastGetField::find_slowcase_pc(pc);
2720 if (addr != (address)-1) {
2721 return Handle_Exception(exceptionInfo, addr);
2722 }
2723 }
2724 return EXCEPTION_CONTINUE_SEARCH;
2725 }
2726
2727 #define DEFINE_FAST_GETFIELD(Return,Fieldname,Result) \
2728 Return JNICALL jni_fast_Get##Result##Field_wrapper(JNIEnv *env, jobject obj, jfieldID fieldID) { \
2729 __try { \
2730 return (*JNI_FastGetField::jni_fast_Get##Result##Field_fp)(env, obj, fieldID); \
2731 } __except(fastJNIAccessorExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { \
2732 } \
2733 return 0; \
2734 }
2735
2736 DEFINE_FAST_GETFIELD(jboolean, bool, Boolean)
2737 DEFINE_FAST_GETFIELD(jbyte, byte, Byte)
2738 DEFINE_FAST_GETFIELD(jchar, char, Char)
2739 DEFINE_FAST_GETFIELD(jshort, short, Short)
2740 DEFINE_FAST_GETFIELD(jint, int, Int)
2741 DEFINE_FAST_GETFIELD(jlong, long, Long)
2742 DEFINE_FAST_GETFIELD(jfloat, float, Float)
2743 DEFINE_FAST_GETFIELD(jdouble, double, Double)
2744
2745 address os::win32::fast_jni_accessor_wrapper(BasicType type) {
2746 switch (type) {
2747 case T_BOOLEAN: return (address)jni_fast_GetBooleanField_wrapper;
2748 case T_BYTE: return (address)jni_fast_GetByteField_wrapper;
2749 case T_CHAR: return (address)jni_fast_GetCharField_wrapper;
2750 case T_SHORT: return (address)jni_fast_GetShortField_wrapper;
2751 case T_INT: return (address)jni_fast_GetIntField_wrapper;
2752 case T_LONG: return (address)jni_fast_GetLongField_wrapper;
2753 case T_FLOAT: return (address)jni_fast_GetFloatField_wrapper;
2754 case T_DOUBLE: return (address)jni_fast_GetDoubleField_wrapper;
2755 default: ShouldNotReachHere();
2756 }
2757 return (address)-1;
2758 }
2759 #endif
2760
2761 void os::win32::call_test_func_with_wrapper(void (*funcPtr)(void)) {
2762 // Install a win32 structured exception handler around the test
2763 // function call so the VM can generate an error dump if needed.
2764 __try {
2765 (*funcPtr)();
2766 } __except(topLevelExceptionFilter(
2767 (_EXCEPTION_POINTERS*)_exception_info())) {
2768 // Nothing to do.
2769 }
2770 }
2771
2772 // Virtual Memory
2773
2774 int os::vm_page_size() { return os::win32::vm_page_size(); }
2775 int os::vm_allocation_granularity() {
2776 return os::win32::vm_allocation_granularity();
2777 }
2778
2779 // Windows large page support is available on Windows 2003. In order to use
2780 // large page memory, the administrator must first assign additional privilege
2781 // to the user:
2782 // + select Control Panel -> Administrative Tools -> Local Security Policy
2783 // + select Local Policies -> User Rights Assignment
2784 // + double click "Lock pages in memory", add users and/or groups
2785 // + reboot
2786 // Note the above steps are needed for administrator as well, as administrators
2787 // by default do not have the privilege to lock pages in memory.
2788 //
2789 // Note about Windows 2003: although the API supports committing large page
2790 // memory on a page-by-page basis and VirtualAlloc() returns success under this
2791 // scenario, I found through experiment it only uses large page if the entire
2792 // memory region is reserved and committed in a single VirtualAlloc() call.
2793 // This makes Windows large page support more or less like Solaris ISM, in
2794 // that the entire heap must be committed upfront. This probably will change
2795 // in the future, if so the code below needs to be revisited.
2796
2797 #ifndef MEM_LARGE_PAGES
2798 #define MEM_LARGE_PAGES 0x20000000
2799 #endif
2800
2801 static HANDLE _hProcess;
2802 static HANDLE _hToken;
2803
2804 // Container for NUMA node list info
2805 class NUMANodeListHolder {
2806 private:
2807 int *_numa_used_node_list; // allocated below
2808 int _numa_used_node_count;
2809
2810 void free_node_list() {
2811 if (_numa_used_node_list != NULL) {
2812 FREE_C_HEAP_ARRAY(int, _numa_used_node_list, mtInternal);
2813 }
2814 }
2815
2816 public:
2817 NUMANodeListHolder() {
2818 _numa_used_node_count = 0;
2819 _numa_used_node_list = NULL;
2820 // do rest of initialization in build routine (after function pointers are set up)
2821 }
2822
2823 ~NUMANodeListHolder() {
2824 free_node_list();
2825 }
2826
2827 bool build() {
2828 DWORD_PTR proc_aff_mask;
2829 DWORD_PTR sys_aff_mask;
2830 if (!GetProcessAffinityMask(GetCurrentProcess(), &proc_aff_mask, &sys_aff_mask)) return false;
2831 ULONG highest_node_number;
2832 if (!os::Kernel32Dll::GetNumaHighestNodeNumber(&highest_node_number)) return false;
2833 free_node_list();
2834 _numa_used_node_list = NEW_C_HEAP_ARRAY(int, highest_node_number + 1, mtInternal);
2835 for (unsigned int i = 0; i <= highest_node_number; i++) {
2836 ULONGLONG proc_mask_numa_node;
2837 if (!os::Kernel32Dll::GetNumaNodeProcessorMask(i, &proc_mask_numa_node)) return false;
2838 if ((proc_aff_mask & proc_mask_numa_node)!=0) {
2839 _numa_used_node_list[_numa_used_node_count++] = i;
2840 }
2841 }
2842 return (_numa_used_node_count > 1);
2843 }
2844
2845 int get_count() {return _numa_used_node_count;}
2846 int get_node_list_entry(int n) {
2847 // for indexes out of range, returns -1
2848 return (n < _numa_used_node_count ? _numa_used_node_list[n] : -1);
2849 }
2850
2851 } numa_node_list_holder;
2852
2853
2854
2855 static size_t _large_page_size = 0;
2856
2857 static bool resolve_functions_for_large_page_init() {
2858 return os::Kernel32Dll::GetLargePageMinimumAvailable() &&
2859 os::Advapi32Dll::AdvapiAvailable();
2860 }
2861
2862 static bool request_lock_memory_privilege() {
2863 _hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE,
2864 os::current_process_id());
2865
2866 LUID luid;
2867 if (_hProcess != NULL &&
2868 os::Advapi32Dll::OpenProcessToken(_hProcess, TOKEN_ADJUST_PRIVILEGES, &_hToken) &&
2869 os::Advapi32Dll::LookupPrivilegeValue(NULL, "SeLockMemoryPrivilege", &luid)) {
2870
2871 TOKEN_PRIVILEGES tp;
2872 tp.PrivilegeCount = 1;
2873 tp.Privileges[0].Luid = luid;
2874 tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
2875
2876 // AdjustTokenPrivileges() may return TRUE even when it couldn't change the
2877 // privilege. Check GetLastError() too. See MSDN document.
2878 if (os::Advapi32Dll::AdjustTokenPrivileges(_hToken, false, &tp, sizeof(tp), NULL, NULL) &&
2879 (GetLastError() == ERROR_SUCCESS)) {
2880 return true;
2881 }
2882 }
2883
2884 return false;
2885 }
2886
2887 static void cleanup_after_large_page_init() {
2888 if (_hProcess) CloseHandle(_hProcess);
2889 _hProcess = NULL;
2890 if (_hToken) CloseHandle(_hToken);
2891 _hToken = NULL;
2892 }
2893
2894 static bool numa_interleaving_init() {
2895 bool success = false;
2896 bool use_numa_interleaving_specified = !FLAG_IS_DEFAULT(UseNUMAInterleaving);
2897
2898 // print a warning if UseNUMAInterleaving flag is specified on command line
2899 bool warn_on_failure = use_numa_interleaving_specified;
2900 # define WARN(msg) if (warn_on_failure) { warning(msg); }
2901
2902 // NUMAInterleaveGranularity cannot be less than vm_allocation_granularity (or _large_page_size if using large pages)
2903 size_t min_interleave_granularity = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2904 NUMAInterleaveGranularity = align_size_up(NUMAInterleaveGranularity, min_interleave_granularity);
2905
2906 if (os::Kernel32Dll::NumaCallsAvailable()) {
2907 if (numa_node_list_holder.build()) {
2908 if (PrintMiscellaneous && Verbose) {
2909 tty->print("NUMA UsedNodeCount=%d, namely ", numa_node_list_holder.get_count());
2910 for (int i = 0; i < numa_node_list_holder.get_count(); i++) {
2911 tty->print("%d ", numa_node_list_holder.get_node_list_entry(i));
2912 }
2913 tty->print("\n");
2914 }
2915 success = true;
2916 } else {
2917 WARN("Process does not cover multiple NUMA nodes.");
2918 }
2919 } else {
2920 WARN("NUMA Interleaving is not supported by the operating system.");
2921 }
2922 if (!success) {
2923 if (use_numa_interleaving_specified) WARN("...Ignoring UseNUMAInterleaving flag.");
2924 }
2925 return success;
2926 #undef WARN
2927 }
2928
2929 // this routine is used whenever we need to reserve a contiguous VA range
2930 // but we need to make separate VirtualAlloc calls for each piece of the range
2931 // Reasons for doing this:
2932 // * UseLargePagesIndividualAllocation was set (normally only needed on WS2003 but possible to be set otherwise)
2933 // * UseNUMAInterleaving requires a separate node for each piece
2934 static char* allocate_pages_individually(size_t bytes, char* addr, DWORD flags, DWORD prot,
2935 bool should_inject_error=false) {
2936 char * p_buf;
2937 // note: at setup time we guaranteed that NUMAInterleaveGranularity was aligned up to a page size
2938 size_t page_size = UseLargePages ? _large_page_size : os::vm_allocation_granularity();
2939 size_t chunk_size = UseNUMAInterleaving ? NUMAInterleaveGranularity : page_size;
2940
2941 // first reserve enough address space in advance since we want to be
2942 // able to break a single contiguous virtual address range into multiple
2943 // large page commits but WS2003 does not allow reserving large page space
2944 // so we just use 4K pages for reserve, this gives us a legal contiguous
2945 // address space. then we will deallocate that reservation, and re alloc
2946 // using large pages
2947 const size_t size_of_reserve = bytes + chunk_size;
2948 if (bytes > size_of_reserve) {
2949 // Overflowed.
2950 return NULL;
2951 }
2952 p_buf = (char *) VirtualAlloc(addr,
2953 size_of_reserve, // size of Reserve
2954 MEM_RESERVE,
2955 PAGE_READWRITE);
2956 // If reservation failed, return NULL
2957 if (p_buf == NULL) return NULL;
2958 MemTracker::record_virtual_memory_reserve((address)p_buf, size_of_reserve, CALLER_PC);
2959 os::release_memory(p_buf, bytes + chunk_size);
2960
2961 // we still need to round up to a page boundary (in case we are using large pages)
2962 // but not to a chunk boundary (in case InterleavingGranularity doesn't align with page size)
2963 // instead we handle this in the bytes_to_rq computation below
2964 p_buf = (char *) align_size_up((size_t)p_buf, page_size);
2965
2966 // now go through and allocate one chunk at a time until all bytes are
2967 // allocated
2968 size_t bytes_remaining = bytes;
2969 // An overflow of align_size_up() would have been caught above
2970 // in the calculation of size_of_reserve.
2971 char * next_alloc_addr = p_buf;
2972 HANDLE hProc = GetCurrentProcess();
2973
2974 #ifdef ASSERT
2975 // Variable for the failure injection
2976 long ran_num = os::random();
2977 size_t fail_after = ran_num % bytes;
2978 #endif
2979
2980 int count=0;
2981 while (bytes_remaining) {
2982 // select bytes_to_rq to get to the next chunk_size boundary
2983
2984 size_t bytes_to_rq = MIN2(bytes_remaining, chunk_size - ((size_t)next_alloc_addr % chunk_size));
2985 // Note allocate and commit
2986 char * p_new;
2987
2988 #ifdef ASSERT
2989 bool inject_error_now = should_inject_error && (bytes_remaining <= fail_after);
2990 #else
2991 const bool inject_error_now = false;
2992 #endif
2993
2994 if (inject_error_now) {
2995 p_new = NULL;
2996 } else {
2997 if (!UseNUMAInterleaving) {
2998 p_new = (char *) VirtualAlloc(next_alloc_addr,
2999 bytes_to_rq,
3000 flags,
3001 prot);
3002 } else {
3003 // get the next node to use from the used_node_list
3004 assert(numa_node_list_holder.get_count() > 0, "Multiple NUMA nodes expected");
3005 DWORD node = numa_node_list_holder.get_node_list_entry(count % numa_node_list_holder.get_count());
3006 p_new = (char *)os::Kernel32Dll::VirtualAllocExNuma(hProc,
3007 next_alloc_addr,
3008 bytes_to_rq,
3009 flags,
3010 prot,
3011 node);
3012 }
3013 }
3014
3015 if (p_new == NULL) {
3016 // Free any allocated pages
3017 if (next_alloc_addr > p_buf) {
3018 // Some memory was committed so release it.
3019 size_t bytes_to_release = bytes - bytes_remaining;
3020 // NMT has yet to record any individual blocks, so it
3021 // need to create a dummy 'reserve' record to match
3022 // the release.
3023 MemTracker::record_virtual_memory_reserve((address)p_buf,
3024 bytes_to_release, CALLER_PC);
3025 os::release_memory(p_buf, bytes_to_release);
3026 }
3027 #ifdef ASSERT
3028 if (should_inject_error) {
3029 if (TracePageSizes && Verbose) {
3030 tty->print_cr("Reserving pages individually failed.");
3031 }
3032 }
3033 #endif
3034 return NULL;
3035 }
3036
3037 bytes_remaining -= bytes_to_rq;
3038 next_alloc_addr += bytes_to_rq;
3039 count++;
3040 }
3041 // Although the memory is allocated individually, it is returned as one.
3042 // NMT records it as one block.
3043 if ((flags & MEM_COMMIT) != 0) {
3044 MemTracker::record_virtual_memory_reserve_and_commit((address)p_buf, bytes, CALLER_PC);
3045 } else {
3046 MemTracker::record_virtual_memory_reserve((address)p_buf, bytes, CALLER_PC);
3047 }
3048
3049 // made it this far, success
3050 return p_buf;
3051 }
3052
3053
3054
3055 void os::large_page_init() {
3056 if (!UseLargePages) return;
3057
3058 // print a warning if any large page related flag is specified on command line
3059 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3060 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3061 bool success = false;
3062
3063 # define WARN(msg) if (warn_on_failure) { warning(msg); }
3064 if (resolve_functions_for_large_page_init()) {
3065 if (request_lock_memory_privilege()) {
3066 size_t s = os::Kernel32Dll::GetLargePageMinimum();
3067 if (s) {
3068 #if defined(IA32) || defined(AMD64)
3069 if (s > 4*M || LargePageSizeInBytes > 4*M) {
3070 WARN("JVM cannot use large pages bigger than 4mb.");
3071 } else {
3072 #endif
3073 if (LargePageSizeInBytes && LargePageSizeInBytes % s == 0) {
3074 _large_page_size = LargePageSizeInBytes;
3075 } else {
3076 _large_page_size = s;
3077 }
3078 success = true;
3079 #if defined(IA32) || defined(AMD64)
3080 }
3081 #endif
3082 } else {
3083 WARN("Large page is not supported by the processor.");
3084 }
3085 } else {
3086 WARN("JVM cannot use large page memory because it does not have enough privilege to lock pages in memory.");
3087 }
3088 } else {
3089 WARN("Large page is not supported by the operating system.");
3090 }
3091 #undef WARN
3092
3093 const size_t default_page_size = (size_t) vm_page_size();
3094 if (success && _large_page_size > default_page_size) {
3095 _page_sizes[0] = _large_page_size;
3096 _page_sizes[1] = default_page_size;
3097 _page_sizes[2] = 0;
3098 }
3099
3100 cleanup_after_large_page_init();
3101 UseLargePages = success;
3102 }
3103
3104 // On win32, one cannot release just a part of reserved memory, it's an
3105 // all or nothing deal. When we split a reservation, we must break the
3106 // reservation into two reservations.
3107 void os::pd_split_reserved_memory(char *base, size_t size, size_t split,
3108 bool realloc) {
3109 if (size > 0) {
3110 release_memory(base, size);
3111 if (realloc) {
3112 reserve_memory(split, base);
3113 }
3114 if (size != split) {
3115 reserve_memory(size - split, base + split);
3116 }
3117 }
3118 }
3119
3120 // Multiple threads can race in this code but it's not possible to unmap small sections of
3121 // virtual space to get requested alignment, like posix-like os's.
3122 // Windows prevents multiple thread from remapping over each other so this loop is thread-safe.
3123 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
3124 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
3125 "Alignment must be a multiple of allocation granularity (page size)");
3126 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
3127
3128 size_t extra_size = size + alignment;
3129 assert(extra_size >= size, "overflow, size is too large to allow alignment");
3130
3131 char* aligned_base = NULL;
3132
3133 do {
3134 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
3135 if (extra_base == NULL) {
3136 return NULL;
3137 }
3138 // Do manual alignment
3139 aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
3140
3141 os::release_memory(extra_base, extra_size);
3142
3143 aligned_base = os::reserve_memory(size, aligned_base);
3144
3145 } while (aligned_base == NULL);
3146
3147 return aligned_base;
3148 }
3149
3150 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
3151 assert((size_t)addr % os::vm_allocation_granularity() == 0,
3152 "reserve alignment");
3153 assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
3154 char* res;
3155 // note that if UseLargePages is on, all the areas that require interleaving
3156 // will go thru reserve_memory_special rather than thru here.
3157 bool use_individual = (UseNUMAInterleaving && !UseLargePages);
3158 if (!use_individual) {
3159 res = (char*)VirtualAlloc(addr, bytes, MEM_RESERVE, PAGE_READWRITE);
3160 } else {
3161 elapsedTimer reserveTimer;
3162 if( Verbose && PrintMiscellaneous ) reserveTimer.start();
3163 // in numa interleaving, we have to allocate pages individually
3164 // (well really chunks of NUMAInterleaveGranularity size)
3165 res = allocate_pages_individually(bytes, addr, MEM_RESERVE, PAGE_READWRITE);
3166 if (res == NULL) {
3167 warning("NUMA page allocation failed");
3168 }
3169 if( Verbose && PrintMiscellaneous ) {
3170 reserveTimer.stop();
3171 tty->print_cr("reserve_memory of %Ix bytes took " JLONG_FORMAT " ms (" JLONG_FORMAT " ticks)", bytes,
3172 reserveTimer.milliseconds(), reserveTimer.ticks());
3173 }
3174 }
3175 assert(res == NULL || addr == NULL || addr == res,
3176 "Unexpected address from reserve.");
3177
3178 return res;
3179 }
3180
3181 // Reserve memory at an arbitrary address, only if that area is
3182 // available (and not reserved for something else).
3183 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3184 // Windows os::reserve_memory() fails of the requested address range is
3185 // not avilable.
3186 return reserve_memory(bytes, requested_addr);
3187 }
3188
3189 size_t os::large_page_size() {
3190 return _large_page_size;
3191 }
3192
3193 bool os::can_commit_large_page_memory() {
3194 // Windows only uses large page memory when the entire region is reserved
3195 // and committed in a single VirtualAlloc() call. This may change in the
3196 // future, but with Windows 2003 it's not possible to commit on demand.
3197 return false;
3198 }
3199
3200 bool os::can_execute_large_page_memory() {
3201 return true;
3202 }
3203
3204 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* addr, bool exec) {
3205 assert(UseLargePages, "only for large pages");
3206
3207 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) {
3208 return NULL; // Fallback to small pages.
3209 }
3210
3211 const DWORD prot = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
3212 const DWORD flags = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3213
3214 // with large pages, there are two cases where we need to use Individual Allocation
3215 // 1) the UseLargePagesIndividualAllocation flag is set (set by default on WS2003)
3216 // 2) NUMA Interleaving is enabled, in which case we use a different node for each page
3217 if (UseLargePagesIndividualAllocation || UseNUMAInterleaving) {
3218 if (TracePageSizes && Verbose) {
3219 tty->print_cr("Reserving large pages individually.");
3220 }
3221 char * p_buf = allocate_pages_individually(bytes, addr, flags, prot, LargePagesIndividualAllocationInjectError);
3222 if (p_buf == NULL) {
3223 // give an appropriate warning message
3224 if (UseNUMAInterleaving) {
3225 warning("NUMA large page allocation failed, UseLargePages flag ignored");
3226 }
3227 if (UseLargePagesIndividualAllocation) {
3228 warning("Individually allocated large pages failed, "
3229 "use -XX:-UseLargePagesIndividualAllocation to turn off");
3230 }
3231 return NULL;
3232 }
3233
3234 return p_buf;
3235
3236 } else {
3237 if (TracePageSizes && Verbose) {
3238 tty->print_cr("Reserving large pages in a single large chunk.");
3239 }
3240 // normal policy just allocate it all at once
3241 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES;
3242 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot);
3243 if (res != NULL) {
3244 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, CALLER_PC);
3245 }
3246
3247 return res;
3248 }
3249 }
3250
3251 bool os::release_memory_special(char* base, size_t bytes) {
3252 assert(base != NULL, "Sanity check");
3253 return release_memory(base, bytes);
3254 }
3255
3256 void os::print_statistics() {
3257 }
3258
3259 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec) {
3260 int err = os::get_last_error();
3261 char buf[256];
3262 size_t buf_len = os::lasterror(buf, sizeof(buf));
3263 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
3264 ", %d) failed; error='%s' (DOS error/errno=%d)", addr, bytes,
3265 exec, buf_len != 0 ? buf : "<no_error_string>", err);
3266 }
3267
3268 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
3269 if (bytes == 0) {
3270 // Don't bother the OS with noops.
3271 return true;
3272 }
3273 assert((size_t) addr % os::vm_page_size() == 0, "commit on page boundaries");
3274 assert(bytes % os::vm_page_size() == 0, "commit in page-sized chunks");
3275 // Don't attempt to print anything if the OS call fails. We're
3276 // probably low on resources, so the print itself may cause crashes.
3277
3278 // unless we have NUMAInterleaving enabled, the range of a commit
3279 // is always within a reserve covered by a single VirtualAlloc
3280 // in that case we can just do a single commit for the requested size
3281 if (!UseNUMAInterleaving) {
3282 if (VirtualAlloc(addr, bytes, MEM_COMMIT, PAGE_READWRITE) == NULL) {
3283 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3284 return false;
3285 }
3286 if (exec) {
3287 DWORD oldprot;
3288 // Windows doc says to use VirtualProtect to get execute permissions
3289 if (!VirtualProtect(addr, bytes, PAGE_EXECUTE_READWRITE, &oldprot)) {
3290 NOT_PRODUCT(warn_fail_commit_memory(addr, bytes, exec);)
3291 return false;
3292 }
3293 }
3294 return true;
3295 } else {
3296
3297 // when NUMAInterleaving is enabled, the commit might cover a range that
3298 // came from multiple VirtualAlloc reserves (using allocate_pages_individually).
3299 // VirtualQuery can help us determine that. The RegionSize that VirtualQuery
3300 // returns represents the number of bytes that can be committed in one step.
3301 size_t bytes_remaining = bytes;
3302 char * next_alloc_addr = addr;
3303 while (bytes_remaining > 0) {
3304 MEMORY_BASIC_INFORMATION alloc_info;
3305 VirtualQuery(next_alloc_addr, &alloc_info, sizeof(alloc_info));
3306 size_t bytes_to_rq = MIN2(bytes_remaining, (size_t)alloc_info.RegionSize);
3307 if (VirtualAlloc(next_alloc_addr, bytes_to_rq, MEM_COMMIT,
3308 PAGE_READWRITE) == NULL) {
3309 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3310 exec);)
3311 return false;
3312 }
3313 if (exec) {
3314 DWORD oldprot;
3315 if (!VirtualProtect(next_alloc_addr, bytes_to_rq,
3316 PAGE_EXECUTE_READWRITE, &oldprot)) {
3317 NOT_PRODUCT(warn_fail_commit_memory(next_alloc_addr, bytes_to_rq,
3318 exec);)
3319 return false;
3320 }
3321 }
3322 bytes_remaining -= bytes_to_rq;
3323 next_alloc_addr += bytes_to_rq;
3324 }
3325 }
3326 // if we made it this far, return true
3327 return true;
3328 }
3329
3330 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
3331 bool exec) {
3332 // alignment_hint is ignored on this OS
3333 return pd_commit_memory(addr, size, exec);
3334 }
3335
3336 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
3337 const char* mesg) {
3338 assert(mesg != NULL, "mesg must be specified");
3339 if (!pd_commit_memory(addr, size, exec)) {
3340 warn_fail_commit_memory(addr, size, exec);
3341 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
3342 }
3343 }
3344
3345 void os::pd_commit_memory_or_exit(char* addr, size_t size,
3346 size_t alignment_hint, bool exec,
3347 const char* mesg) {
3348 // alignment_hint is ignored on this OS
3349 pd_commit_memory_or_exit(addr, size, exec, mesg);
3350 }
3351
3352 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
3353 if (bytes == 0) {
3354 // Don't bother the OS with noops.
3355 return true;
3356 }
3357 assert((size_t) addr % os::vm_page_size() == 0, "uncommit on page boundaries");
3358 assert(bytes % os::vm_page_size() == 0, "uncommit in page-sized chunks");
3359 return (VirtualFree(addr, bytes, MEM_DECOMMIT) != 0);
3360 }
3361
3362 bool os::pd_release_memory(char* addr, size_t bytes) {
3363 return VirtualFree(addr, 0, MEM_RELEASE) != 0;
3364 }
3365
3366 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
3367 return os::commit_memory(addr, size, !ExecMem);
3368 }
3369
3370 bool os::remove_stack_guard_pages(char* addr, size_t size) {
3371 return os::uncommit_memory(addr, size);
3372 }
3373
3374 // Set protections specified
3375 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3376 bool is_committed) {
3377 unsigned int p = 0;
3378 switch (prot) {
3379 case MEM_PROT_NONE: p = PAGE_NOACCESS; break;
3380 case MEM_PROT_READ: p = PAGE_READONLY; break;
3381 case MEM_PROT_RW: p = PAGE_READWRITE; break;
3382 case MEM_PROT_RWX: p = PAGE_EXECUTE_READWRITE; break;
3383 default:
3384 ShouldNotReachHere();
3385 }
3386
3387 DWORD old_status;
3388
3389 // Strange enough, but on Win32 one can change protection only for committed
3390 // memory, not a big deal anyway, as bytes less or equal than 64K
3391 if (!is_committed) {
3392 commit_memory_or_exit(addr, bytes, prot == MEM_PROT_RWX,
3393 "cannot commit protection page");
3394 }
3395 // One cannot use os::guard_memory() here, as on Win32 guard page
3396 // have different (one-shot) semantics, from MSDN on PAGE_GUARD:
3397 //
3398 // Pages in the region become guard pages. Any attempt to access a guard page
3399 // causes the system to raise a STATUS_GUARD_PAGE exception and turn off
3400 // the guard page status. Guard pages thus act as a one-time access alarm.
3401 return VirtualProtect(addr, bytes, p, &old_status) != 0;
3402 }
3403
3404 bool os::guard_memory(char* addr, size_t bytes) {
3405 DWORD old_status;
3406 return VirtualProtect(addr, bytes, PAGE_READWRITE | PAGE_GUARD, &old_status) != 0;
3407 }
3408
3409 bool os::unguard_memory(char* addr, size_t bytes) {
3410 DWORD old_status;
3411 return VirtualProtect(addr, bytes, PAGE_READWRITE, &old_status) != 0;
3412 }
3413
3414 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3415 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { }
3416 void os::numa_make_global(char *addr, size_t bytes) { }
3417 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { }
3418 bool os::numa_topology_changed() { return false; }
3419 size_t os::numa_get_groups_num() { return MAX2(numa_node_list_holder.get_count(), 1); }
3420 int os::numa_get_group_id() { return 0; }
3421 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
3422 if (numa_node_list_holder.get_count() == 0 && size > 0) {
3423 // Provide an answer for UMA systems
3424 ids[0] = 0;
3425 return 1;
3426 } else {
3427 // check for size bigger than actual groups_num
3428 size = MIN2(size, numa_get_groups_num());
3429 for (int i = 0; i < (int)size; i++) {
3430 ids[i] = numa_node_list_holder.get_node_list_entry(i);
3431 }
3432 return size;
3433 }
3434 }
3435
3436 bool os::get_page_info(char *start, page_info* info) {
3437 return false;
3438 }
3439
3440 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
3441 return end;
3442 }
3443
3444 char* os::non_memory_address_word() {
3445 // Must never look like an address returned by reserve_memory,
3446 // even in its subfields (as defined by the CPU immediate fields,
3447 // if the CPU splits constants across multiple instructions).
3448 return (char*)-1;
3449 }
3450
3451 #define MAX_ERROR_COUNT 100
3452 #define SYS_THREAD_ERROR 0xffffffffUL
3453
3454 void os::pd_start_thread(Thread* thread) {
3455 DWORD ret = ResumeThread(thread->osthread()->thread_handle());
3456 // Returns previous suspend state:
3457 // 0: Thread was not suspended
3458 // 1: Thread is running now
3459 // >1: Thread is still suspended.
3460 assert(ret != SYS_THREAD_ERROR, "StartThread failed"); // should propagate back
3461 }
3462
3463 class HighResolutionInterval : public CHeapObj<mtThread> {
3464 // The default timer resolution seems to be 10 milliseconds.
3465 // (Where is this written down?)
3466 // If someone wants to sleep for only a fraction of the default,
3467 // then we set the timer resolution down to 1 millisecond for
3468 // the duration of their interval.
3469 // We carefully set the resolution back, since otherwise we
3470 // seem to incur an overhead (3%?) that we don't need.
3471 // CONSIDER: if ms is small, say 3, then we should run with a high resolution time.
3472 // Buf if ms is large, say 500, or 503, we should avoid the call to timeBeginPeriod().
3473 // Alternatively, we could compute the relative error (503/500 = .6%) and only use
3474 // timeBeginPeriod() if the relative error exceeded some threshold.
3475 // timeBeginPeriod() has been linked to problems with clock drift on win32 systems and
3476 // to decreased efficiency related to increased timer "tick" rates. We want to minimize
3477 // (a) calls to timeBeginPeriod() and timeEndPeriod() and (b) time spent with high
3478 // resolution timers running.
3479 private:
3480 jlong resolution;
3481 public:
3482 HighResolutionInterval(jlong ms) {
3483 resolution = ms % 10L;
3484 if (resolution != 0) {
3485 MMRESULT result = timeBeginPeriod(1L);
3486 }
3487 }
3488 ~HighResolutionInterval() {
3489 if (resolution != 0) {
3490 MMRESULT result = timeEndPeriod(1L);
3491 }
3492 resolution = 0L;
3493 }
3494 };
3495
3496 int os::sleep(Thread* thread, jlong ms, bool interruptable) {
3497 jlong limit = (jlong) MAXDWORD;
3498
3499 while(ms > limit) {
3500 int res;
3501 if ((res = sleep(thread, limit, interruptable)) != OS_TIMEOUT)
3502 return res;
3503 ms -= limit;
3504 }
3505
3506 assert(thread == Thread::current(), "thread consistency check");
3507 OSThread* osthread = thread->osthread();
3508 OSThreadWaitState osts(osthread, false /* not Object.wait() */);
3509 int result;
3510 if (interruptable) {
3511 assert(thread->is_Java_thread(), "must be java thread");
3512 JavaThread *jt = (JavaThread *) thread;
3513 ThreadBlockInVM tbivm(jt);
3514
3515 jt->set_suspend_equivalent();
3516 // cleared by handle_special_suspend_equivalent_condition() or
3517 // java_suspend_self() via check_and_wait_while_suspended()
3518
3519 HANDLE events[1];
3520 events[0] = osthread->interrupt_event();
3521 HighResolutionInterval *phri=NULL;
3522 if(!ForceTimeHighResolution)
3523 phri = new HighResolutionInterval( ms );
3524 if (WaitForMultipleObjects(1, events, FALSE, (DWORD)ms) == WAIT_TIMEOUT) {
3525 result = OS_TIMEOUT;
3526 } else {
3527 ResetEvent(osthread->interrupt_event());
3528 osthread->set_interrupted(false);
3529 result = OS_INTRPT;
3530 }
3531 delete phri; //if it is NULL, harmless
3532
3533 // were we externally suspended while we were waiting?
3534 jt->check_and_wait_while_suspended();
3535 } else {
3536 assert(!thread->is_Java_thread(), "must not be java thread");
3537 Sleep((long) ms);
3538 result = OS_TIMEOUT;
3539 }
3540 return result;
3541 }
3542
3543 //
3544 // Short sleep, direct OS call.
3545 //
3546 // ms = 0, means allow others (if any) to run.
3547 //
3548 void os::naked_short_sleep(jlong ms) {
3549 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3550 Sleep(ms);
3551 }
3552
3553 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3554 void os::infinite_sleep() {
3555 while (true) { // sleep forever ...
3556 Sleep(100000); // ... 100 seconds at a time
3557 }
3558 }
3559
3560 typedef BOOL (WINAPI * STTSignature)(void) ;
3561
3562 os::YieldResult os::NakedYield() {
3563 // Use either SwitchToThread() or Sleep(0)
3564 // Consider passing back the return value from SwitchToThread().
3565 if (os::Kernel32Dll::SwitchToThreadAvailable()) {
3566 return SwitchToThread() ? os::YIELD_SWITCHED : os::YIELD_NONEREADY ;
3567 } else {
3568 Sleep(0);
3569 }
3570 return os::YIELD_UNKNOWN ;
3571 }
3572
3573 void os::yield() { os::NakedYield(); }
3574
3575 void os::yield_all(int attempts) {
3576 // Yields to all threads, including threads with lower priorities
3577 Sleep(1);
3578 }
3579
3580 // Win32 only gives you access to seven real priorities at a time,
3581 // so we compress Java's ten down to seven. It would be better
3582 // if we dynamically adjusted relative priorities.
3583
3584 int os::java_to_os_priority[CriticalPriority + 1] = {
3585 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3586 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3587 THREAD_PRIORITY_LOWEST, // 2
3588 THREAD_PRIORITY_BELOW_NORMAL, // 3
3589 THREAD_PRIORITY_BELOW_NORMAL, // 4
3590 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3591 THREAD_PRIORITY_NORMAL, // 6
3592 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3593 THREAD_PRIORITY_ABOVE_NORMAL, // 8
3594 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3595 THREAD_PRIORITY_HIGHEST, // 10 MaxPriority
3596 THREAD_PRIORITY_HIGHEST // 11 CriticalPriority
3597 };
3598
3599 int prio_policy1[CriticalPriority + 1] = {
3600 THREAD_PRIORITY_IDLE, // 0 Entry should never be used
3601 THREAD_PRIORITY_LOWEST, // 1 MinPriority
3602 THREAD_PRIORITY_LOWEST, // 2
3603 THREAD_PRIORITY_BELOW_NORMAL, // 3
3604 THREAD_PRIORITY_BELOW_NORMAL, // 4
3605 THREAD_PRIORITY_NORMAL, // 5 NormPriority
3606 THREAD_PRIORITY_ABOVE_NORMAL, // 6
3607 THREAD_PRIORITY_ABOVE_NORMAL, // 7
3608 THREAD_PRIORITY_HIGHEST, // 8
3609 THREAD_PRIORITY_HIGHEST, // 9 NearMaxPriority
3610 THREAD_PRIORITY_TIME_CRITICAL, // 10 MaxPriority
3611 THREAD_PRIORITY_TIME_CRITICAL // 11 CriticalPriority
3612 };
3613
3614 static int prio_init() {
3615 // If ThreadPriorityPolicy is 1, switch tables
3616 if (ThreadPriorityPolicy == 1) {
3617 int i;
3618 for (i = 0; i < CriticalPriority + 1; i++) {
3619 os::java_to_os_priority[i] = prio_policy1[i];
3620 }
3621 }
3622 if (UseCriticalJavaThreadPriority) {
3623 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority] ;
3624 }
3625 return 0;
3626 }
3627
3628 OSReturn os::set_native_priority(Thread* thread, int priority) {
3629 if (!UseThreadPriorities) return OS_OK;
3630 bool ret = SetThreadPriority(thread->osthread()->thread_handle(), priority) != 0;
3631 return ret ? OS_OK : OS_ERR;
3632 }
3633
3634 OSReturn os::get_native_priority(const Thread* const thread, int* priority_ptr) {
3635 if ( !UseThreadPriorities ) {
3636 *priority_ptr = java_to_os_priority[NormPriority];
3637 return OS_OK;
3638 }
3639 int os_prio = GetThreadPriority(thread->osthread()->thread_handle());
3640 if (os_prio == THREAD_PRIORITY_ERROR_RETURN) {
3641 assert(false, "GetThreadPriority failed");
3642 return OS_ERR;
3643 }
3644 *priority_ptr = os_prio;
3645 return OS_OK;
3646 }
3647
3648
3649 // Hint to the underlying OS that a task switch would not be good.
3650 // Void return because it's a hint and can fail.
3651 void os::hint_no_preempt() {}
3652
3653 void os::interrupt(Thread* thread) {
3654 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3655 "possibility of dangling Thread pointer");
3656
3657 OSThread* osthread = thread->osthread();
3658 osthread->set_interrupted(true);
3659 // More than one thread can get here with the same value of osthread,
3660 // resulting in multiple notifications. We do, however, want the store
3661 // to interrupted() to be visible to other threads before we post
3662 // the interrupt event.
3663 OrderAccess::release();
3664 SetEvent(osthread->interrupt_event());
3665 // For JSR166: unpark after setting status
3666 if (thread->is_Java_thread())
3667 ((JavaThread*)thread)->parker()->unpark();
3668
3669 ParkEvent * ev = thread->_ParkEvent ;
3670 if (ev != NULL) ev->unpark() ;
3671
3672 }
3673
3674
3675 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3676 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
3677 "possibility of dangling Thread pointer");
3678
3679 OSThread* osthread = thread->osthread();
3680 // There is no synchronization between the setting of the interrupt
3681 // and it being cleared here. It is critical - see 6535709 - that
3682 // we only clear the interrupt state, and reset the interrupt event,
3683 // if we are going to report that we were indeed interrupted - else
3684 // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
3685 // depending on the timing. By checking thread interrupt event to see
3686 // if the thread gets real interrupt thus prevent spurious wakeup.
3687 bool interrupted = osthread->interrupted() && (WaitForSingleObject(osthread->interrupt_event(), 0) == WAIT_OBJECT_0);
3688 if (interrupted && clear_interrupted) {
3689 osthread->set_interrupted(false);
3690 ResetEvent(osthread->interrupt_event());
3691 } // Otherwise leave the interrupted state alone
3692
3693 return interrupted;
3694 }
3695
3696 // Get's a pc (hint) for a running thread. Currently used only for profiling.
3697 ExtendedPC os::get_thread_pc(Thread* thread) {
3698 CONTEXT context;
3699 context.ContextFlags = CONTEXT_CONTROL;
3700 HANDLE handle = thread->osthread()->thread_handle();
3701 #ifdef _M_IA64
3702 assert(0, "Fix get_thread_pc");
3703 return ExtendedPC(NULL);
3704 #else
3705 if (GetThreadContext(handle, &context)) {
3706 #ifdef _M_AMD64
3707 return ExtendedPC((address) context.Rip);
3708 #else
3709 return ExtendedPC((address) context.Eip);
3710 #endif
3711 } else {
3712 return ExtendedPC(NULL);
3713 }
3714 #endif
3715 }
3716
3717 // GetCurrentThreadId() returns DWORD
3718 intx os::current_thread_id() { return GetCurrentThreadId(); }
3719
3720 static int _initial_pid = 0;
3721
3722 int os::current_process_id()
3723 {
3724 return (_initial_pid ? _initial_pid : _getpid());
3725 }
3726
3727 int os::win32::_vm_page_size = 0;
3728 int os::win32::_vm_allocation_granularity = 0;
3729 int os::win32::_processor_type = 0;
3730 // Processor level is not available on non-NT systems, use vm_version instead
3731 int os::win32::_processor_level = 0;
3732 julong os::win32::_physical_memory = 0;
3733 size_t os::win32::_default_stack_size = 0;
3734
3735 intx os::win32::_os_thread_limit = 0;
3736 volatile intx os::win32::_os_thread_count = 0;
3737
3738 bool os::win32::_is_nt = false;
3739 bool os::win32::_is_windows_2003 = false;
3740 bool os::win32::_is_windows_server = false;
3741
3742 void os::win32::initialize_system_info() {
3743 SYSTEM_INFO si;
3744 GetSystemInfo(&si);
3745 _vm_page_size = si.dwPageSize;
3746 _vm_allocation_granularity = si.dwAllocationGranularity;
3747 _processor_type = si.dwProcessorType;
3748 _processor_level = si.wProcessorLevel;
3749 set_processor_count(si.dwNumberOfProcessors);
3750
3751 MEMORYSTATUSEX ms;
3752 ms.dwLength = sizeof(ms);
3753
3754 // also returns dwAvailPhys (free physical memory bytes), dwTotalVirtual, dwAvailVirtual,
3755 // dwMemoryLoad (% of memory in use)
3756 GlobalMemoryStatusEx(&ms);
3757 _physical_memory = ms.ullTotalPhys;
3758
3759 OSVERSIONINFOEX oi;
3760 oi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
3761 GetVersionEx((OSVERSIONINFO*)&oi);
3762 switch(oi.dwPlatformId) {
3763 case VER_PLATFORM_WIN32_WINDOWS: _is_nt = false; break;
3764 case VER_PLATFORM_WIN32_NT:
3765 _is_nt = true;
3766 {
3767 int os_vers = oi.dwMajorVersion * 1000 + oi.dwMinorVersion;
3768 if (os_vers == 5002) {
3769 _is_windows_2003 = true;
3770 }
3771 if (oi.wProductType == VER_NT_DOMAIN_CONTROLLER ||
3772 oi.wProductType == VER_NT_SERVER) {
3773 _is_windows_server = true;
3774 }
3775 }
3776 break;
3777 default: fatal("Unknown platform");
3778 }
3779
3780 _default_stack_size = os::current_stack_size();
3781 assert(_default_stack_size > (size_t) _vm_page_size, "invalid stack size");
3782 assert((_default_stack_size & (_vm_page_size - 1)) == 0,
3783 "stack size not a multiple of page size");
3784
3785 initialize_performance_counter();
3786
3787 // Win95/Win98 scheduler bug work-around. The Win95/98 scheduler is
3788 // known to deadlock the system, if the VM issues to thread operations with
3789 // a too high frequency, e.g., such as changing the priorities.
3790 // The 6000 seems to work well - no deadlocks has been notices on the test
3791 // programs that we have seen experience this problem.
3792 if (!os::win32::is_nt()) {
3793 StarvationMonitorInterval = 6000;
3794 }
3795 }
3796
3797
3798 HINSTANCE os::win32::load_Windows_dll(const char* name, char *ebuf, int ebuflen) {
3799 char path[MAX_PATH];
3800 DWORD size;
3801 DWORD pathLen = (DWORD)sizeof(path);
3802 HINSTANCE result = NULL;
3803
3804 // only allow library name without path component
3805 assert(strchr(name, '\\') == NULL, "path not allowed");
3806 assert(strchr(name, ':') == NULL, "path not allowed");
3807 if (strchr(name, '\\') != NULL || strchr(name, ':') != NULL) {
3808 jio_snprintf(ebuf, ebuflen,
3809 "Invalid parameter while calling os::win32::load_windows_dll(): cannot take path: %s", name);
3810 return NULL;
3811 }
3812
3813 // search system directory
3814 if ((size = GetSystemDirectory(path, pathLen)) > 0) {
3815 strcat(path, "\\");
3816 strcat(path, name);
3817 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3818 return result;
3819 }
3820 }
3821
3822 // try Windows directory
3823 if ((size = GetWindowsDirectory(path, pathLen)) > 0) {
3824 strcat(path, "\\");
3825 strcat(path, name);
3826 if ((result = (HINSTANCE)os::dll_load(path, ebuf, ebuflen)) != NULL) {
3827 return result;
3828 }
3829 }
3830
3831 jio_snprintf(ebuf, ebuflen,
3832 "os::win32::load_windows_dll() cannot load %s from system directories.", name);
3833 return NULL;
3834 }
3835
3836 void os::win32::setmode_streams() {
3837 _setmode(_fileno(stdin), _O_BINARY);
3838 _setmode(_fileno(stdout), _O_BINARY);
3839 _setmode(_fileno(stderr), _O_BINARY);
3840 }
3841
3842
3843 bool os::is_debugger_attached() {
3844 return IsDebuggerPresent() ? true : false;
3845 }
3846
3847
3848 void os::wait_for_keypress_at_exit(void) {
3849 if (PauseAtExit) {
3850 fprintf(stderr, "Press any key to continue...\n");
3851 fgetc(stdin);
3852 }
3853 }
3854
3855
3856 int os::message_box(const char* title, const char* message) {
3857 int result = MessageBox(NULL, message, title,
3858 MB_YESNO | MB_ICONERROR | MB_SYSTEMMODAL | MB_DEFAULT_DESKTOP_ONLY);
3859 return result == IDYES;
3860 }
3861
3862 int os::allocate_thread_local_storage() {
3863 return TlsAlloc();
3864 }
3865
3866
3867 void os::free_thread_local_storage(int index) {
3868 TlsFree(index);
3869 }
3870
3871
3872 void os::thread_local_storage_at_put(int index, void* value) {
3873 TlsSetValue(index, value);
3874 assert(thread_local_storage_at(index) == value, "Just checking");
3875 }
3876
3877
3878 void* os::thread_local_storage_at(int index) {
3879 return TlsGetValue(index);
3880 }
3881
3882
3883 #ifndef PRODUCT
3884 #ifndef _WIN64
3885 // Helpers to check whether NX protection is enabled
3886 int nx_exception_filter(_EXCEPTION_POINTERS *pex) {
3887 if (pex->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
3888 pex->ExceptionRecord->NumberParameters > 0 &&
3889 pex->ExceptionRecord->ExceptionInformation[0] ==
3890 EXCEPTION_INFO_EXEC_VIOLATION) {
3891 return EXCEPTION_EXECUTE_HANDLER;
3892 }
3893 return EXCEPTION_CONTINUE_SEARCH;
3894 }
3895
3896 void nx_check_protection() {
3897 // If NX is enabled we'll get an exception calling into code on the stack
3898 char code[] = { (char)0xC3 }; // ret
3899 void *code_ptr = (void *)code;
3900 __try {
3901 __asm call code_ptr
3902 } __except(nx_exception_filter((_EXCEPTION_POINTERS*)_exception_info())) {
3903 tty->print_raw_cr("NX protection detected.");
3904 }
3905 }
3906 #endif // _WIN64
3907 #endif // PRODUCT
3908
3909 // this is called _before_ the global arguments have been parsed
3910 void os::init(void) {
3911 _initial_pid = _getpid();
3912
3913 init_random(1234567);
3914
3915 win32::initialize_system_info();
3916 win32::setmode_streams();
3917 init_page_sizes((size_t) win32::vm_page_size());
3918
3919 // For better scalability on MP systems (must be called after initialize_system_info)
3920 #ifndef PRODUCT
3921 if (is_MP()) {
3922 NoYieldsInMicrolock = true;
3923 }
3924 #endif
3925 // This may be overridden later when argument processing is done.
3926 FLAG_SET_ERGO(bool, UseLargePagesIndividualAllocation,
3927 os::win32::is_windows_2003());
3928
3929 // Initialize main_process and main_thread
3930 main_process = GetCurrentProcess(); // Remember main_process is a pseudo handle
3931 if (!DuplicateHandle(main_process, GetCurrentThread(), main_process,
3932 &main_thread, THREAD_ALL_ACCESS, false, 0)) {
3933 fatal("DuplicateHandle failed\n");
3934 }
3935 main_thread_id = (int) GetCurrentThreadId();
3936 }
3937
3938 // To install functions for atexit processing
3939 extern "C" {
3940 static void perfMemory_exit_helper() {
3941 perfMemory_exit();
3942 }
3943 }
3944
3945 static jint initSock();
3946
3947 // this is called _after_ the global arguments have been parsed
3948 jint os::init_2(void) {
3949 // Allocate a single page and mark it as readable for safepoint polling
3950 address polling_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READONLY);
3951 guarantee( polling_page != NULL, "Reserve Failed for polling page");
3952
3953 address return_page = (address)VirtualAlloc(polling_page, os::vm_page_size(), MEM_COMMIT, PAGE_READONLY);
3954 guarantee( return_page != NULL, "Commit Failed for polling page");
3955
3956 os::set_polling_page( polling_page );
3957
3958 #ifndef PRODUCT
3959 if( Verbose && PrintMiscellaneous )
3960 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
3961 #endif
3962
3963 if (!UseMembar) {
3964 address mem_serialize_page = (address)VirtualAlloc(NULL, os::vm_page_size(), MEM_RESERVE, PAGE_READWRITE);
3965 guarantee( mem_serialize_page != NULL, "Reserve Failed for memory serialize page");
3966
3967 return_page = (address)VirtualAlloc(mem_serialize_page, os::vm_page_size(), MEM_COMMIT, PAGE_READWRITE);
3968 guarantee( return_page != NULL, "Commit Failed for memory serialize page");
3969
3970 os::set_memory_serialize_page( mem_serialize_page );
3971
3972 #ifndef PRODUCT
3973 if(Verbose && PrintMiscellaneous)
3974 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3975 #endif
3976 }
3977
3978 // Setup Windows Exceptions
3979
3980 // for debugging float code generation bugs
3981 if (ForceFloatExceptions) {
3982 #ifndef _WIN64
3983 static long fp_control_word = 0;
3984 __asm { fstcw fp_control_word }
3985 // see Intel PPro Manual, Vol. 2, p 7-16
3986 const long precision = 0x20;
3987 const long underflow = 0x10;
3988 const long overflow = 0x08;
3989 const long zero_div = 0x04;
3990 const long denorm = 0x02;
3991 const long invalid = 0x01;
3992 fp_control_word |= invalid;
3993 __asm { fldcw fp_control_word }
3994 #endif
3995 }
3996
3997 // If stack_commit_size is 0, windows will reserve the default size,
3998 // but only commit a small portion of it.
3999 size_t stack_commit_size = round_to(ThreadStackSize*K, os::vm_page_size());
4000 size_t default_reserve_size = os::win32::default_stack_size();
4001 size_t actual_reserve_size = stack_commit_size;
4002 if (stack_commit_size < default_reserve_size) {
4003 // If stack_commit_size == 0, we want this too
4004 actual_reserve_size = default_reserve_size;
4005 }
4006
4007 // Check minimum allowable stack size for thread creation and to initialize
4008 // the java system classes, including StackOverflowError - depends on page
4009 // size. Add a page for compiler2 recursion in main thread.
4010 // Add in 2*BytesPerWord times page size to account for VM stack during
4011 // class initialization depending on 32 or 64 bit VM.
4012 size_t min_stack_allowed =
4013 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4014 2*BytesPerWord COMPILER2_PRESENT(+1)) * os::vm_page_size();
4015 if (actual_reserve_size < min_stack_allowed) {
4016 tty->print_cr("\nThe stack size specified is too small, "
4017 "Specify at least %dk",
4018 min_stack_allowed / K);
4019 return JNI_ERR;
4020 }
4021
4022 JavaThread::set_stack_size_at_create(stack_commit_size);
4023
4024 // Calculate theoretical max. size of Threads to guard gainst artifical
4025 // out-of-memory situations, where all available address-space has been
4026 // reserved by thread stacks.
4027 assert(actual_reserve_size != 0, "Must have a stack");
4028
4029 // Calculate the thread limit when we should start doing Virtual Memory
4030 // banging. Currently when the threads will have used all but 200Mb of space.
4031 //
4032 // TODO: consider performing a similar calculation for commit size instead
4033 // as reserve size, since on a 64-bit platform we'll run into that more
4034 // often than running out of virtual memory space. We can use the
4035 // lower value of the two calculations as the os_thread_limit.
4036 size_t max_address_space = ((size_t)1 << (BitsPerWord - 1)) - (200 * K * K);
4037 win32::_os_thread_limit = (intx)(max_address_space / actual_reserve_size);
4038
4039 // at exit methods are called in the reverse order of their registration.
4040 // there is no limit to the number of functions registered. atexit does
4041 // not set errno.
4042
4043 if (PerfAllowAtExitRegistration) {
4044 // only register atexit functions if PerfAllowAtExitRegistration is set.
4045 // atexit functions can be delayed until process exit time, which
4046 // can be problematic for embedded VM situations. Embedded VMs should
4047 // call DestroyJavaVM() to assure that VM resources are released.
4048
4049 // note: perfMemory_exit_helper atexit function may be removed in
4050 // the future if the appropriate cleanup code can be added to the
4051 // VM_Exit VMOperation's doit method.
4052 if (atexit(perfMemory_exit_helper) != 0) {
4053 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
4054 }
4055 }
4056
4057 #ifndef _WIN64
4058 // Print something if NX is enabled (win32 on AMD64)
4059 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) nx_check_protection());
4060 #endif
4061
4062 // initialize thread priority policy
4063 prio_init();
4064
4065 if (UseNUMA && !ForceNUMA) {
4066 UseNUMA = false; // We don't fully support this yet
4067 }
4068
4069 if (UseNUMAInterleaving) {
4070 // first check whether this Windows OS supports VirtualAllocExNuma, if not ignore this flag
4071 bool success = numa_interleaving_init();
4072 if (!success) UseNUMAInterleaving = false;
4073 }
4074
4075 if (initSock() != JNI_OK) {
4076 return JNI_ERR;
4077 }
4078
4079 return JNI_OK;
4080 }
4081
4082 // Mark the polling page as unreadable
4083 void os::make_polling_page_unreadable(void) {
4084 DWORD old_status;
4085 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_NOACCESS, &old_status) )
4086 fatal("Could not disable polling page");
4087 };
4088
4089 // Mark the polling page as readable
4090 void os::make_polling_page_readable(void) {
4091 DWORD old_status;
4092 if( !VirtualProtect((char *)_polling_page, os::vm_page_size(), PAGE_READONLY, &old_status) )
4093 fatal("Could not enable polling page");
4094 };
4095
4096
4097 int os::stat(const char *path, struct stat *sbuf) {
4098 char pathbuf[MAX_PATH];
4099 if (strlen(path) > MAX_PATH - 1) {
4100 errno = ENAMETOOLONG;
4101 return -1;
4102 }
4103 os::native_path(strcpy(pathbuf, path));
4104 int ret = ::stat(pathbuf, sbuf);
4105 if (sbuf != NULL && UseUTCFileTimestamp) {
4106 // Fix for 6539723. st_mtime returned from stat() is dependent on
4107 // the system timezone and so can return different values for the
4108 // same file if/when daylight savings time changes. This adjustment
4109 // makes sure the same timestamp is returned regardless of the TZ.
4110 //
4111 // See:
4112 // http://msdn.microsoft.com/library/
4113 // default.asp?url=/library/en-us/sysinfo/base/
4114 // time_zone_information_str.asp
4115 // and
4116 // http://msdn.microsoft.com/library/default.asp?url=
4117 // /library/en-us/sysinfo/base/settimezoneinformation.asp
4118 //
4119 // NOTE: there is a insidious bug here: If the timezone is changed
4120 // after the call to stat() but before 'GetTimeZoneInformation()', then
4121 // the adjustment we do here will be wrong and we'll return the wrong
4122 // value (which will likely end up creating an invalid class data
4123 // archive). Absent a better API for this, or some time zone locking
4124 // mechanism, we'll have to live with this risk.
4125 TIME_ZONE_INFORMATION tz;
4126 DWORD tzid = GetTimeZoneInformation(&tz);
4127 int daylightBias =
4128 (tzid == TIME_ZONE_ID_DAYLIGHT) ? tz.DaylightBias : tz.StandardBias;
4129 sbuf->st_mtime += (tz.Bias + daylightBias) * 60;
4130 }
4131 return ret;
4132 }
4133
4134
4135 #define FT2INT64(ft) \
4136 ((jlong)((jlong)(ft).dwHighDateTime << 32 | (julong)(ft).dwLowDateTime))
4137
4138
4139 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4140 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4141 // of a thread.
4142 //
4143 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4144 // the fast estimate available on the platform.
4145
4146 // current_thread_cpu_time() is not optimized for Windows yet
4147 jlong os::current_thread_cpu_time() {
4148 // return user + sys since the cost is the same
4149 return os::thread_cpu_time(Thread::current(), true /* user+sys */);
4150 }
4151
4152 jlong os::thread_cpu_time(Thread* thread) {
4153 // consistent with what current_thread_cpu_time() returns.
4154 return os::thread_cpu_time(thread, true /* user+sys */);
4155 }
4156
4157 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4158 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4159 }
4160
4161 jlong os::thread_cpu_time(Thread* thread, bool user_sys_cpu_time) {
4162 // This code is copy from clasic VM -> hpi::sysThreadCPUTime
4163 // If this function changes, os::is_thread_cpu_time_supported() should too
4164 if (os::win32::is_nt()) {
4165 FILETIME CreationTime;
4166 FILETIME ExitTime;
4167 FILETIME KernelTime;
4168 FILETIME UserTime;
4169
4170 if ( GetThreadTimes(thread->osthread()->thread_handle(),
4171 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4172 return -1;
4173 else
4174 if (user_sys_cpu_time) {
4175 return (FT2INT64(UserTime) + FT2INT64(KernelTime)) * 100;
4176 } else {
4177 return FT2INT64(UserTime) * 100;
4178 }
4179 } else {
4180 return (jlong) timeGetTime() * 1000000;
4181 }
4182 }
4183
4184 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4185 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4186 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4187 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4188 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4189 }
4190
4191 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4192 info_ptr->max_value = ALL_64_BITS; // the max value -- all 64 bits
4193 info_ptr->may_skip_backward = false; // GetThreadTimes returns absolute time
4194 info_ptr->may_skip_forward = false; // GetThreadTimes returns absolute time
4195 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4196 }
4197
4198 bool os::is_thread_cpu_time_supported() {
4199 // see os::thread_cpu_time
4200 if (os::win32::is_nt()) {
4201 FILETIME CreationTime;
4202 FILETIME ExitTime;
4203 FILETIME KernelTime;
4204 FILETIME UserTime;
4205
4206 if ( GetThreadTimes(GetCurrentThread(),
4207 &CreationTime, &ExitTime, &KernelTime, &UserTime) == 0)
4208 return false;
4209 else
4210 return true;
4211 } else {
4212 return false;
4213 }
4214 }
4215
4216 // Windows does't provide a loadavg primitive so this is stubbed out for now.
4217 // It does have primitives (PDH API) to get CPU usage and run queue length.
4218 // "\\Processor(_Total)\\% Processor Time", "\\System\\Processor Queue Length"
4219 // If we wanted to implement loadavg on Windows, we have a few options:
4220 //
4221 // a) Query CPU usage and run queue length and "fake" an answer by
4222 // returning the CPU usage if it's under 100%, and the run queue
4223 // length otherwise. It turns out that querying is pretty slow
4224 // on Windows, on the order of 200 microseconds on a fast machine.
4225 // Note that on the Windows the CPU usage value is the % usage
4226 // since the last time the API was called (and the first call
4227 // returns 100%), so we'd have to deal with that as well.
4228 //
4229 // b) Sample the "fake" answer using a sampling thread and store
4230 // the answer in a global variable. The call to loadavg would
4231 // just return the value of the global, avoiding the slow query.
4232 //
4233 // c) Sample a better answer using exponential decay to smooth the
4234 // value. This is basically the algorithm used by UNIX kernels.
4235 //
4236 // Note that sampling thread starvation could affect both (b) and (c).
4237 int os::loadavg(double loadavg[], int nelem) {
4238 return -1;
4239 }
4240
4241
4242 // DontYieldALot=false by default: dutifully perform all yields as requested by JVM_Yield()
4243 bool os::dont_yield() {
4244 return DontYieldALot;
4245 }
4246
4247 // This method is a slightly reworked copy of JDK's sysOpen
4248 // from src/windows/hpi/src/sys_api_md.c
4249
4250 int os::open(const char *path, int oflag, int mode) {
4251 char pathbuf[MAX_PATH];
4252
4253 if (strlen(path) > MAX_PATH - 1) {
4254 errno = ENAMETOOLONG;
4255 return -1;
4256 }
4257 os::native_path(strcpy(pathbuf, path));
4258 return ::open(pathbuf, oflag | O_BINARY | O_NOINHERIT, mode);
4259 }
4260
4261 FILE* os::open(int fd, const char* mode) {
4262 return ::_fdopen(fd, mode);
4263 }
4264
4265 // Is a (classpath) directory empty?
4266 bool os::dir_is_empty(const char* path) {
4267 WIN32_FIND_DATA fd;
4268 HANDLE f = FindFirstFile(path, &fd);
4269 if (f == INVALID_HANDLE_VALUE) {
4270 return true;
4271 }
4272 FindClose(f);
4273 return false;
4274 }
4275
4276 // create binary file, rewriting existing file if required
4277 int os::create_binary_file(const char* path, bool rewrite_existing) {
4278 int oflags = _O_CREAT | _O_WRONLY | _O_BINARY;
4279 if (!rewrite_existing) {
4280 oflags |= _O_EXCL;
4281 }
4282 return ::open(path, oflags, _S_IREAD | _S_IWRITE);
4283 }
4284
4285 // return current position of file pointer
4286 jlong os::current_file_offset(int fd) {
4287 return (jlong)::_lseeki64(fd, (__int64)0L, SEEK_CUR);
4288 }
4289
4290 // move file pointer to the specified offset
4291 jlong os::seek_to_file_offset(int fd, jlong offset) {
4292 return (jlong)::_lseeki64(fd, (__int64)offset, SEEK_SET);
4293 }
4294
4295
4296 jlong os::lseek(int fd, jlong offset, int whence) {
4297 return (jlong) ::_lseeki64(fd, offset, whence);
4298 }
4299
4300 // This method is a slightly reworked copy of JDK's sysNativePath
4301 // from src/windows/hpi/src/path_md.c
4302
4303 /* Convert a pathname to native format. On win32, this involves forcing all
4304 separators to be '\\' rather than '/' (both are legal inputs, but Win95
4305 sometimes rejects '/') and removing redundant separators. The input path is
4306 assumed to have been converted into the character encoding used by the local
4307 system. Because this might be a double-byte encoding, care is taken to
4308 treat double-byte lead characters correctly.
4309
4310 This procedure modifies the given path in place, as the result is never
4311 longer than the original. There is no error return; this operation always
4312 succeeds. */
4313 char * os::native_path(char *path) {
4314 char *src = path, *dst = path, *end = path;
4315 char *colon = NULL; /* If a drive specifier is found, this will
4316 point to the colon following the drive
4317 letter */
4318
4319 /* Assumption: '/', '\\', ':', and drive letters are never lead bytes */
4320 assert(((!::IsDBCSLeadByte('/'))
4321 && (!::IsDBCSLeadByte('\\'))
4322 && (!::IsDBCSLeadByte(':'))),
4323 "Illegal lead byte");
4324
4325 /* Check for leading separators */
4326 #define isfilesep(c) ((c) == '/' || (c) == '\\')
4327 while (isfilesep(*src)) {
4328 src++;
4329 }
4330
4331 if (::isalpha(*src) && !::IsDBCSLeadByte(*src) && src[1] == ':') {
4332 /* Remove leading separators if followed by drive specifier. This
4333 hack is necessary to support file URLs containing drive
4334 specifiers (e.g., "file://c:/path"). As a side effect,
4335 "/c:/path" can be used as an alternative to "c:/path". */
4336 *dst++ = *src++;
4337 colon = dst;
4338 *dst++ = ':';
4339 src++;
4340 } else {
4341 src = path;
4342 if (isfilesep(src[0]) && isfilesep(src[1])) {
4343 /* UNC pathname: Retain first separator; leave src pointed at
4344 second separator so that further separators will be collapsed
4345 into the second separator. The result will be a pathname
4346 beginning with "\\\\" followed (most likely) by a host name. */
4347 src = dst = path + 1;
4348 path[0] = '\\'; /* Force first separator to '\\' */
4349 }
4350 }
4351
4352 end = dst;
4353
4354 /* Remove redundant separators from remainder of path, forcing all
4355 separators to be '\\' rather than '/'. Also, single byte space
4356 characters are removed from the end of the path because those
4357 are not legal ending characters on this operating system.
4358 */
4359 while (*src != '\0') {
4360 if (isfilesep(*src)) {
4361 *dst++ = '\\'; src++;
4362 while (isfilesep(*src)) src++;
4363 if (*src == '\0') {
4364 /* Check for trailing separator */
4365 end = dst;
4366 if (colon == dst - 2) break; /* "z:\\" */
4367 if (dst == path + 1) break; /* "\\" */
4368 if (dst == path + 2 && isfilesep(path[0])) {
4369 /* "\\\\" is not collapsed to "\\" because "\\\\" marks the
4370 beginning of a UNC pathname. Even though it is not, by
4371 itself, a valid UNC pathname, we leave it as is in order
4372 to be consistent with the path canonicalizer as well
4373 as the win32 APIs, which treat this case as an invalid
4374 UNC pathname rather than as an alias for the root
4375 directory of the current drive. */
4376 break;
4377 }
4378 end = --dst; /* Path does not denote a root directory, so
4379 remove trailing separator */
4380 break;
4381 }
4382 end = dst;
4383 } else {
4384 if (::IsDBCSLeadByte(*src)) { /* Copy a double-byte character */
4385 *dst++ = *src++;
4386 if (*src) *dst++ = *src++;
4387 end = dst;
4388 } else { /* Copy a single-byte character */
4389 char c = *src++;
4390 *dst++ = c;
4391 /* Space is not a legal ending character */
4392 if (c != ' ') end = dst;
4393 }
4394 }
4395 }
4396
4397 *end = '\0';
4398
4399 /* For "z:", add "." to work around a bug in the C runtime library */
4400 if (colon == dst - 1) {
4401 path[2] = '.';
4402 path[3] = '\0';
4403 }
4404
4405 return path;
4406 }
4407
4408 // This code is a copy of JDK's sysSetLength
4409 // from src/windows/hpi/src/sys_api_md.c
4410
4411 int os::ftruncate(int fd, jlong length) {
4412 HANDLE h = (HANDLE)::_get_osfhandle(fd);
4413 long high = (long)(length >> 32);
4414 DWORD ret;
4415
4416 if (h == (HANDLE)(-1)) {
4417 return -1;
4418 }
4419
4420 ret = ::SetFilePointer(h, (long)(length), &high, FILE_BEGIN);
4421 if ((ret == 0xFFFFFFFF) && (::GetLastError() != NO_ERROR)) {
4422 return -1;
4423 }
4424
4425 if (::SetEndOfFile(h) == FALSE) {
4426 return -1;
4427 }
4428
4429 return 0;
4430 }
4431
4432
4433 // This code is a copy of JDK's sysSync
4434 // from src/windows/hpi/src/sys_api_md.c
4435 // except for the legacy workaround for a bug in Win 98
4436
4437 int os::fsync(int fd) {
4438 HANDLE handle = (HANDLE)::_get_osfhandle(fd);
4439
4440 if ( (!::FlushFileBuffers(handle)) &&
4441 (GetLastError() != ERROR_ACCESS_DENIED) ) {
4442 /* from winerror.h */
4443 return -1;
4444 }
4445 return 0;
4446 }
4447
4448 static int nonSeekAvailable(int, long *);
4449 static int stdinAvailable(int, long *);
4450
4451 #define S_ISCHR(mode) (((mode) & _S_IFCHR) == _S_IFCHR)
4452 #define S_ISFIFO(mode) (((mode) & _S_IFIFO) == _S_IFIFO)
4453
4454 // This code is a copy of JDK's sysAvailable
4455 // from src/windows/hpi/src/sys_api_md.c
4456
4457 int os::available(int fd, jlong *bytes) {
4458 jlong cur, end;
4459 struct _stati64 stbuf64;
4460
4461 if (::_fstati64(fd, &stbuf64) >= 0) {
4462 int mode = stbuf64.st_mode;
4463 if (S_ISCHR(mode) || S_ISFIFO(mode)) {
4464 int ret;
4465 long lpbytes;
4466 if (fd == 0) {
4467 ret = stdinAvailable(fd, &lpbytes);
4468 } else {
4469 ret = nonSeekAvailable(fd, &lpbytes);
4470 }
4471 (*bytes) = (jlong)(lpbytes);
4472 return ret;
4473 }
4474 if ((cur = ::_lseeki64(fd, 0L, SEEK_CUR)) == -1) {
4475 return FALSE;
4476 } else if ((end = ::_lseeki64(fd, 0L, SEEK_END)) == -1) {
4477 return FALSE;
4478 } else if (::_lseeki64(fd, cur, SEEK_SET) == -1) {
4479 return FALSE;
4480 }
4481 *bytes = end - cur;
4482 return TRUE;
4483 } else {
4484 return FALSE;
4485 }
4486 }
4487
4488 // This code is a copy of JDK's nonSeekAvailable
4489 // from src/windows/hpi/src/sys_api_md.c
4490
4491 static int nonSeekAvailable(int fd, long *pbytes) {
4492 /* This is used for available on non-seekable devices
4493 * (like both named and anonymous pipes, such as pipes
4494 * connected to an exec'd process).
4495 * Standard Input is a special case.
4496 *
4497 */
4498 HANDLE han;
4499
4500 if ((han = (HANDLE) ::_get_osfhandle(fd)) == (HANDLE)(-1)) {
4501 return FALSE;
4502 }
4503
4504 if (! ::PeekNamedPipe(han, NULL, 0, NULL, (LPDWORD)pbytes, NULL)) {
4505 /* PeekNamedPipe fails when at EOF. In that case we
4506 * simply make *pbytes = 0 which is consistent with the
4507 * behavior we get on Solaris when an fd is at EOF.
4508 * The only alternative is to raise an Exception,
4509 * which isn't really warranted.
4510 */
4511 if (::GetLastError() != ERROR_BROKEN_PIPE) {
4512 return FALSE;
4513 }
4514 *pbytes = 0;
4515 }
4516 return TRUE;
4517 }
4518
4519 #define MAX_INPUT_EVENTS 2000
4520
4521 // This code is a copy of JDK's stdinAvailable
4522 // from src/windows/hpi/src/sys_api_md.c
4523
4524 static int stdinAvailable(int fd, long *pbytes) {
4525 HANDLE han;
4526 DWORD numEventsRead = 0; /* Number of events read from buffer */
4527 DWORD numEvents = 0; /* Number of events in buffer */
4528 DWORD i = 0; /* Loop index */
4529 DWORD curLength = 0; /* Position marker */
4530 DWORD actualLength = 0; /* Number of bytes readable */
4531 BOOL error = FALSE; /* Error holder */
4532 INPUT_RECORD *lpBuffer; /* Pointer to records of input events */
4533
4534 if ((han = ::GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE) {
4535 return FALSE;
4536 }
4537
4538 /* Construct an array of input records in the console buffer */
4539 error = ::GetNumberOfConsoleInputEvents(han, &numEvents);
4540 if (error == 0) {
4541 return nonSeekAvailable(fd, pbytes);
4542 }
4543
4544 /* lpBuffer must fit into 64K or else PeekConsoleInput fails */
4545 if (numEvents > MAX_INPUT_EVENTS) {
4546 numEvents = MAX_INPUT_EVENTS;
4547 }
4548
4549 lpBuffer = (INPUT_RECORD *)os::malloc(numEvents * sizeof(INPUT_RECORD), mtInternal);
4550 if (lpBuffer == NULL) {
4551 return FALSE;
4552 }
4553
4554 error = ::PeekConsoleInput(han, lpBuffer, numEvents, &numEventsRead);
4555 if (error == 0) {
4556 os::free(lpBuffer, mtInternal);
4557 return FALSE;
4558 }
4559
4560 /* Examine input records for the number of bytes available */
4561 for(i=0; i<numEvents; i++) {
4562 if (lpBuffer[i].EventType == KEY_EVENT) {
4563
4564 KEY_EVENT_RECORD *keyRecord = (KEY_EVENT_RECORD *)
4565 &(lpBuffer[i].Event);
4566 if (keyRecord->bKeyDown == TRUE) {
4567 CHAR *keyPressed = (CHAR *) &(keyRecord->uChar);
4568 curLength++;
4569 if (*keyPressed == '\r') {
4570 actualLength = curLength;
4571 }
4572 }
4573 }
4574 }
4575
4576 if(lpBuffer != NULL) {
4577 os::free(lpBuffer, mtInternal);
4578 }
4579
4580 *pbytes = (long) actualLength;
4581 return TRUE;
4582 }
4583
4584 // Map a block of memory.
4585 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4586 char *addr, size_t bytes, bool read_only,
4587 bool allow_exec) {
4588 HANDLE hFile;
4589 char* base;
4590
4591 hFile = CreateFile(file_name, GENERIC_READ, FILE_SHARE_READ, NULL,
4592 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
4593 if (hFile == NULL) {
4594 if (PrintMiscellaneous && Verbose) {
4595 DWORD err = GetLastError();
4596 tty->print_cr("CreateFile() failed: GetLastError->%ld.", err);
4597 }
4598 return NULL;
4599 }
4600
4601 if (allow_exec) {
4602 // CreateFileMapping/MapViewOfFileEx can't map executable memory
4603 // unless it comes from a PE image (which the shared archive is not.)
4604 // Even VirtualProtect refuses to give execute access to mapped memory
4605 // that was not previously executable.
4606 //
4607 // Instead, stick the executable region in anonymous memory. Yuck.
4608 // Penalty is that ~4 pages will not be shareable - in the future
4609 // we might consider DLLizing the shared archive with a proper PE
4610 // header so that mapping executable + sharing is possible.
4611
4612 base = (char*) VirtualAlloc(addr, bytes, MEM_COMMIT | MEM_RESERVE,
4613 PAGE_READWRITE);
4614 if (base == NULL) {
4615 if (PrintMiscellaneous && Verbose) {
4616 DWORD err = GetLastError();
4617 tty->print_cr("VirtualAlloc() failed: GetLastError->%ld.", err);
4618 }
4619 CloseHandle(hFile);
4620 return NULL;
4621 }
4622
4623 DWORD bytes_read;
4624 OVERLAPPED overlapped;
4625 overlapped.Offset = (DWORD)file_offset;
4626 overlapped.OffsetHigh = 0;
4627 overlapped.hEvent = NULL;
4628 // ReadFile guarantees that if the return value is true, the requested
4629 // number of bytes were read before returning.
4630 bool res = ReadFile(hFile, base, (DWORD)bytes, &bytes_read, &overlapped) != 0;
4631 if (!res) {
4632 if (PrintMiscellaneous && Verbose) {
4633 DWORD err = GetLastError();
4634 tty->print_cr("ReadFile() failed: GetLastError->%ld.", err);
4635 }
4636 release_memory(base, bytes);
4637 CloseHandle(hFile);
4638 return NULL;
4639 }
4640 } else {
4641 HANDLE hMap = CreateFileMapping(hFile, NULL, PAGE_WRITECOPY, 0, 0,
4642 NULL /*file_name*/);
4643 if (hMap == NULL) {
4644 if (PrintMiscellaneous && Verbose) {
4645 DWORD err = GetLastError();
4646 tty->print_cr("CreateFileMapping() failed: GetLastError->%ld.", err);
4647 }
4648 CloseHandle(hFile);
4649 return NULL;
4650 }
4651
4652 DWORD access = read_only ? FILE_MAP_READ : FILE_MAP_COPY;
4653 base = (char*)MapViewOfFileEx(hMap, access, 0, (DWORD)file_offset,
4654 (DWORD)bytes, addr);
4655 if (base == NULL) {
4656 if (PrintMiscellaneous && Verbose) {
4657 DWORD err = GetLastError();
4658 tty->print_cr("MapViewOfFileEx() failed: GetLastError->%ld.", err);
4659 }
4660 CloseHandle(hMap);
4661 CloseHandle(hFile);
4662 return NULL;
4663 }
4664
4665 if (CloseHandle(hMap) == 0) {
4666 if (PrintMiscellaneous && Verbose) {
4667 DWORD err = GetLastError();
4668 tty->print_cr("CloseHandle(hMap) failed: GetLastError->%ld.", err);
4669 }
4670 CloseHandle(hFile);
4671 return base;
4672 }
4673 }
4674
4675 if (allow_exec) {
4676 DWORD old_protect;
4677 DWORD exec_access = read_only ? PAGE_EXECUTE_READ : PAGE_EXECUTE_READWRITE;
4678 bool res = VirtualProtect(base, bytes, exec_access, &old_protect) != 0;
4679
4680 if (!res) {
4681 if (PrintMiscellaneous && Verbose) {
4682 DWORD err = GetLastError();
4683 tty->print_cr("VirtualProtect() failed: GetLastError->%ld.", err);
4684 }
4685 // Don't consider this a hard error, on IA32 even if the
4686 // VirtualProtect fails, we should still be able to execute
4687 CloseHandle(hFile);
4688 return base;
4689 }
4690 }
4691
4692 if (CloseHandle(hFile) == 0) {
4693 if (PrintMiscellaneous && Verbose) {
4694 DWORD err = GetLastError();
4695 tty->print_cr("CloseHandle(hFile) failed: GetLastError->%ld.", err);
4696 }
4697 return base;
4698 }
4699
4700 return base;
4701 }
4702
4703
4704 // Remap a block of memory.
4705 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4706 char *addr, size_t bytes, bool read_only,
4707 bool allow_exec) {
4708 // This OS does not allow existing memory maps to be remapped so we
4709 // have to unmap the memory before we remap it.
4710 if (!os::unmap_memory(addr, bytes)) {
4711 return NULL;
4712 }
4713
4714 // There is a very small theoretical window between the unmap_memory()
4715 // call above and the map_memory() call below where a thread in native
4716 // code may be able to access an address that is no longer mapped.
4717
4718 return os::map_memory(fd, file_name, file_offset, addr, bytes,
4719 read_only, allow_exec);
4720 }
4721
4722
4723 // Unmap a block of memory.
4724 // Returns true=success, otherwise false.
4725
4726 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4727 BOOL result = UnmapViewOfFile(addr);
4728 if (result == 0) {
4729 if (PrintMiscellaneous && Verbose) {
4730 DWORD err = GetLastError();
4731 tty->print_cr("UnmapViewOfFile() failed: GetLastError->%ld.", err);
4732 }
4733 return false;
4734 }
4735 return true;
4736 }
4737
4738 void os::pause() {
4739 char filename[MAX_PATH];
4740 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4741 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4742 } else {
4743 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4744 }
4745
4746 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4747 if (fd != -1) {
4748 struct stat buf;
4749 ::close(fd);
4750 while (::stat(filename, &buf) == 0) {
4751 Sleep(100);
4752 }
4753 } else {
4754 jio_fprintf(stderr,
4755 "Could not open pause file '%s', continuing immediately.\n", filename);
4756 }
4757 }
4758
4759 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
4760 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
4761 }
4762
4763 /*
4764 * See the caveats for this class in os_windows.hpp
4765 * Protects the callback call so that raised OS EXCEPTIONS causes a jump back
4766 * into this method and returns false. If no OS EXCEPTION was raised, returns
4767 * true.
4768 * The callback is supposed to provide the method that should be protected.
4769 */
4770 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
4771 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
4772 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
4773 "crash_protection already set?");
4774
4775 bool success = true;
4776 __try {
4777 WatcherThread::watcher_thread()->set_crash_protection(this);
4778 cb.call();
4779 } __except(EXCEPTION_EXECUTE_HANDLER) {
4780 // only for protection, nothing to do
4781 success = false;
4782 }
4783 WatcherThread::watcher_thread()->set_crash_protection(NULL);
4784 return success;
4785 }
4786
4787 // An Event wraps a win32 "CreateEvent" kernel handle.
4788 //
4789 // We have a number of choices regarding "CreateEvent" win32 handle leakage:
4790 //
4791 // 1: When a thread dies return the Event to the EventFreeList, clear the ParkHandle
4792 // field, and call CloseHandle() on the win32 event handle. Unpark() would
4793 // need to be modified to tolerate finding a NULL (invalid) win32 event handle.
4794 // In addition, an unpark() operation might fetch the handle field, but the
4795 // event could recycle between the fetch and the SetEvent() operation.
4796 // SetEvent() would either fail because the handle was invalid, or inadvertently work,
4797 // as the win32 handle value had been recycled. In an ideal world calling SetEvent()
4798 // on an stale but recycled handle would be harmless, but in practice this might
4799 // confuse other non-Sun code, so it's not a viable approach.
4800 //
4801 // 2: Once a win32 event handle is associated with an Event, it remains associated
4802 // with the Event. The event handle is never closed. This could be construed
4803 // as handle leakage, but only up to the maximum # of threads that have been extant
4804 // at any one time. This shouldn't be an issue, as windows platforms typically
4805 // permit a process to have hundreds of thousands of open handles.
4806 //
4807 // 3: Same as (1), but periodically, at stop-the-world time, rundown the EventFreeList
4808 // and release unused handles.
4809 //
4810 // 4: Add a CRITICAL_SECTION to the Event to protect LD+SetEvent from LD;ST(null);CloseHandle.
4811 // It's not clear, however, that we wouldn't be trading one type of leak for another.
4812 //
4813 // 5. Use an RCU-like mechanism (Read-Copy Update).
4814 // Or perhaps something similar to Maged Michael's "Hazard pointers".
4815 //
4816 // We use (2).
4817 //
4818 // TODO-FIXME:
4819 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the objectmonitor implementation.
4820 // 2. Consider wrapping the WaitForSingleObject(Ex) calls in SEH try/finally blocks
4821 // to recover from (or at least detect) the dreaded Windows 841176 bug.
4822 // 3. Collapse the interrupt_event, the JSR166 parker event, and the objectmonitor ParkEvent
4823 // into a single win32 CreateEvent() handle.
4824 //
4825 // _Event transitions in park()
4826 // -1 => -1 : illegal
4827 // 1 => 0 : pass - return immediately
4828 // 0 => -1 : block
4829 //
4830 // _Event serves as a restricted-range semaphore :
4831 // -1 : thread is blocked
4832 // 0 : neutral - thread is running or ready
4833 // 1 : signaled - thread is running or ready
4834 //
4835 // Another possible encoding of _Event would be
4836 // with explicit "PARKED" and "SIGNALED" bits.
4837
4838 int os::PlatformEvent::park (jlong Millis) {
4839 guarantee (_ParkHandle != NULL , "Invariant") ;
4840 guarantee (Millis > 0 , "Invariant") ;
4841 int v ;
4842
4843 // CONSIDER: defer assigning a CreateEvent() handle to the Event until
4844 // the initial park() operation.
4845
4846 for (;;) {
4847 v = _Event ;
4848 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4849 }
4850 guarantee ((v == 0) || (v == 1), "invariant") ;
4851 if (v != 0) return OS_OK ;
4852
4853 // Do this the hard way by blocking ...
4854 // TODO: consider a brief spin here, gated on the success of recent
4855 // spin attempts by this thread.
4856 //
4857 // We decompose long timeouts into series of shorter timed waits.
4858 // Evidently large timo values passed in WaitForSingleObject() are problematic on some
4859 // versions of Windows. See EventWait() for details. This may be superstition. Or not.
4860 // We trust the WAIT_TIMEOUT indication and don't track the elapsed wait time
4861 // with os::javaTimeNanos(). Furthermore, we assume that spurious returns from
4862 // ::WaitForSingleObject() caused by latent ::setEvent() operations will tend
4863 // to happen early in the wait interval. Specifically, after a spurious wakeup (rv ==
4864 // WAIT_OBJECT_0 but _Event is still < 0) we don't bother to recompute Millis to compensate
4865 // for the already waited time. This policy does not admit any new outcomes.
4866 // In the future, however, we might want to track the accumulated wait time and
4867 // adjust Millis accordingly if we encounter a spurious wakeup.
4868
4869 const int MAXTIMEOUT = 0x10000000 ;
4870 DWORD rv = WAIT_TIMEOUT ;
4871 while (_Event < 0 && Millis > 0) {
4872 DWORD prd = Millis ; // set prd = MAX (Millis, MAXTIMEOUT)
4873 if (Millis > MAXTIMEOUT) {
4874 prd = MAXTIMEOUT ;
4875 }
4876 rv = ::WaitForSingleObject (_ParkHandle, prd) ;
4877 assert (rv == WAIT_OBJECT_0 || rv == WAIT_TIMEOUT, "WaitForSingleObject failed") ;
4878 if (rv == WAIT_TIMEOUT) {
4879 Millis -= prd ;
4880 }
4881 }
4882 v = _Event ;
4883 _Event = 0 ;
4884 // see comment at end of os::PlatformEvent::park() below:
4885 OrderAccess::fence() ;
4886 // If we encounter a nearly simultanous timeout expiry and unpark()
4887 // we return OS_OK indicating we awoke via unpark().
4888 // Implementor's license -- returning OS_TIMEOUT would be equally valid, however.
4889 return (v >= 0) ? OS_OK : OS_TIMEOUT ;
4890 }
4891
4892 void os::PlatformEvent::park () {
4893 guarantee (_ParkHandle != NULL, "Invariant") ;
4894 // Invariant: Only the thread associated with the Event/PlatformEvent
4895 // may call park().
4896 int v ;
4897 for (;;) {
4898 v = _Event ;
4899 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
4900 }
4901 guarantee ((v == 0) || (v == 1), "invariant") ;
4902 if (v != 0) return ;
4903
4904 // Do this the hard way by blocking ...
4905 // TODO: consider a brief spin here, gated on the success of recent
4906 // spin attempts by this thread.
4907 while (_Event < 0) {
4908 DWORD rv = ::WaitForSingleObject (_ParkHandle, INFINITE) ;
4909 assert (rv == WAIT_OBJECT_0, "WaitForSingleObject failed") ;
4910 }
4911
4912 // Usually we'll find _Event == 0 at this point, but as
4913 // an optional optimization we clear it, just in case can
4914 // multiple unpark() operations drove _Event up to 1.
4915 _Event = 0 ;
4916 OrderAccess::fence() ;
4917 guarantee (_Event >= 0, "invariant") ;
4918 }
4919
4920 void os::PlatformEvent::unpark() {
4921 guarantee (_ParkHandle != NULL, "Invariant") ;
4922
4923 // Transitions for _Event:
4924 // 0 :=> 1
4925 // 1 :=> 1
4926 // -1 :=> either 0 or 1; must signal target thread
4927 // That is, we can safely transition _Event from -1 to either
4928 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
4929 // unpark() calls.
4930 // See also: "Semaphores in Plan 9" by Mullender & Cox
4931 //
4932 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4933 // that it will take two back-to-back park() calls for the owning
4934 // thread to block. This has the benefit of forcing a spurious return
4935 // from the first park() call after an unpark() call which will help
4936 // shake out uses of park() and unpark() without condition variables.
4937
4938 if (Atomic::xchg(1, &_Event) >= 0) return;
4939
4940 ::SetEvent(_ParkHandle);
4941 }
4942
4943
4944 // JSR166
4945 // -------------------------------------------------------
4946
4947 /*
4948 * The Windows implementation of Park is very straightforward: Basic
4949 * operations on Win32 Events turn out to have the right semantics to
4950 * use them directly. We opportunistically resuse the event inherited
4951 * from Monitor.
4952 */
4953
4954
4955 void Parker::park(bool isAbsolute, jlong time) {
4956 guarantee (_ParkEvent != NULL, "invariant") ;
4957 // First, demultiplex/decode time arguments
4958 if (time < 0) { // don't wait
4959 return;
4960 }
4961 else if (time == 0 && !isAbsolute) {
4962 time = INFINITE;
4963 }
4964 else if (isAbsolute) {
4965 time -= os::javaTimeMillis(); // convert to relative time
4966 if (time <= 0) // already elapsed
4967 return;
4968 }
4969 else { // relative
4970 time /= 1000000; // Must coarsen from nanos to millis
4971 if (time == 0) // Wait for the minimal time unit if zero
4972 time = 1;
4973 }
4974
4975 JavaThread* thread = (JavaThread*)(Thread::current());
4976 assert(thread->is_Java_thread(), "Must be JavaThread");
4977 JavaThread *jt = (JavaThread *)thread;
4978
4979 // Don't wait if interrupted or already triggered
4980 if (Thread::is_interrupted(thread, false) ||
4981 WaitForSingleObject(_ParkEvent, 0) == WAIT_OBJECT_0) {
4982 ResetEvent(_ParkEvent);
4983 return;
4984 }
4985 else {
4986 ThreadBlockInVM tbivm(jt);
4987 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4988 jt->set_suspend_equivalent();
4989
4990 WaitForSingleObject(_ParkEvent, time);
4991 ResetEvent(_ParkEvent);
4992
4993 // If externally suspended while waiting, re-suspend
4994 if (jt->handle_special_suspend_equivalent_condition()) {
4995 jt->java_suspend_self();
4996 }
4997 }
4998 }
4999
5000 void Parker::unpark() {
5001 guarantee (_ParkEvent != NULL, "invariant") ;
5002 SetEvent(_ParkEvent);
5003 }
5004
5005 // Run the specified command in a separate process. Return its exit value,
5006 // or -1 on failure (e.g. can't create a new process).
5007 int os::fork_and_exec(char* cmd) {
5008 STARTUPINFO si;
5009 PROCESS_INFORMATION pi;
5010
5011 memset(&si, 0, sizeof(si));
5012 si.cb = sizeof(si);
5013 memset(&pi, 0, sizeof(pi));
5014 BOOL rslt = CreateProcess(NULL, // executable name - use command line
5015 cmd, // command line
5016 NULL, // process security attribute
5017 NULL, // thread security attribute
5018 TRUE, // inherits system handles
5019 0, // no creation flags
5020 NULL, // use parent's environment block
5021 NULL, // use parent's starting directory
5022 &si, // (in) startup information
5023 &pi); // (out) process information
5024
5025 if (rslt) {
5026 // Wait until child process exits.
5027 WaitForSingleObject(pi.hProcess, INFINITE);
5028
5029 DWORD exit_code;
5030 GetExitCodeProcess(pi.hProcess, &exit_code);
5031
5032 // Close process and thread handles.
5033 CloseHandle(pi.hProcess);
5034 CloseHandle(pi.hThread);
5035
5036 return (int)exit_code;
5037 } else {
5038 return -1;
5039 }
5040 }
5041
5042 //--------------------------------------------------------------------------------------------------
5043 // Non-product code
5044
5045 static int mallocDebugIntervalCounter = 0;
5046 static int mallocDebugCounter = 0;
5047 bool os::check_heap(bool force) {
5048 if (++mallocDebugCounter < MallocVerifyStart && !force) return true;
5049 if (++mallocDebugIntervalCounter >= MallocVerifyInterval || force) {
5050 // Note: HeapValidate executes two hardware breakpoints when it finds something
5051 // wrong; at these points, eax contains the address of the offending block (I think).
5052 // To get to the exlicit error message(s) below, just continue twice.
5053 HANDLE heap = GetProcessHeap();
5054 { HeapLock(heap);
5055 PROCESS_HEAP_ENTRY phe;
5056 phe.lpData = NULL;
5057 while (HeapWalk(heap, &phe) != 0) {
5058 if ((phe.wFlags & PROCESS_HEAP_ENTRY_BUSY) &&
5059 !HeapValidate(heap, 0, phe.lpData)) {
5060 tty->print_cr("C heap has been corrupted (time: %d allocations)", mallocDebugCounter);
5061 tty->print_cr("corrupted block near address %#x, length %d", phe.lpData, phe.cbData);
5062 fatal("corrupted C heap");
5063 }
5064 }
5065 DWORD err = GetLastError();
5066 if (err != ERROR_NO_MORE_ITEMS && err != ERROR_CALL_NOT_IMPLEMENTED) {
5067 fatal(err_msg("heap walk aborted with error %d", err));
5068 }
5069 HeapUnlock(heap);
5070 }
5071 mallocDebugIntervalCounter = 0;
5072 }
5073 return true;
5074 }
5075
5076
5077 bool os::find(address addr, outputStream* st) {
5078 // Nothing yet
5079 return false;
5080 }
5081
5082 LONG WINAPI os::win32::serialize_fault_filter(struct _EXCEPTION_POINTERS* e) {
5083 DWORD exception_code = e->ExceptionRecord->ExceptionCode;
5084
5085 if ( exception_code == EXCEPTION_ACCESS_VIOLATION ) {
5086 JavaThread* thread = (JavaThread*)ThreadLocalStorage::get_thread_slow();
5087 PEXCEPTION_RECORD exceptionRecord = e->ExceptionRecord;
5088 address addr = (address) exceptionRecord->ExceptionInformation[1];
5089
5090 if (os::is_memory_serialize_page(thread, addr))
5091 return EXCEPTION_CONTINUE_EXECUTION;
5092 }
5093
5094 return EXCEPTION_CONTINUE_SEARCH;
5095 }
5096
5097 // We don't build a headless jre for Windows
5098 bool os::is_headless_jre() { return false; }
5099
5100 static jint initSock() {
5101 WSADATA wsadata;
5102
5103 if (!os::WinSock2Dll::WinSock2Available()) {
5104 jio_fprintf(stderr, "Could not load Winsock (error: %d)\n",
5105 ::GetLastError());
5106 return JNI_ERR;
5107 }
5108
5109 if (os::WinSock2Dll::WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
5110 jio_fprintf(stderr, "Could not initialize Winsock (error: %d)\n",
5111 ::GetLastError());
5112 return JNI_ERR;
5113 }
5114 return JNI_OK;
5115 }
5116
5117 struct hostent* os::get_host_by_name(char* name) {
5118 return (struct hostent*)os::WinSock2Dll::gethostbyname(name);
5119 }
5120
5121 int os::socket_close(int fd) {
5122 return ::closesocket(fd);
5123 }
5124
5125 int os::socket_available(int fd, jint *pbytes) {
5126 int ret = ::ioctlsocket(fd, FIONREAD, (u_long*)pbytes);
5127 return (ret < 0) ? 0 : 1;
5128 }
5129
5130 int os::socket(int domain, int type, int protocol) {
5131 return ::socket(domain, type, protocol);
5132 }
5133
5134 int os::listen(int fd, int count) {
5135 return ::listen(fd, count);
5136 }
5137
5138 int os::connect(int fd, struct sockaddr* him, socklen_t len) {
5139 return ::connect(fd, him, len);
5140 }
5141
5142 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5143 return ::accept(fd, him, len);
5144 }
5145
5146 int os::sendto(int fd, char* buf, size_t len, uint flags,
5147 struct sockaddr* to, socklen_t tolen) {
5148
5149 return ::sendto(fd, buf, (int)len, flags, to, tolen);
5150 }
5151
5152 int os::recvfrom(int fd, char *buf, size_t nBytes, uint flags,
5153 sockaddr* from, socklen_t* fromlen) {
5154
5155 return ::recvfrom(fd, buf, (int)nBytes, flags, from, fromlen);
5156 }
5157
5158 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5159 return ::recv(fd, buf, (int)nBytes, flags);
5160 }
5161
5162 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5163 return ::send(fd, buf, (int)nBytes, flags);
5164 }
5165
5166 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5167 return ::send(fd, buf, (int)nBytes, flags);
5168 }
5169
5170 int os::timeout(int fd, long timeout) {
5171 fd_set tbl;
5172 struct timeval t;
5173
5174 t.tv_sec = timeout / 1000;
5175 t.tv_usec = (timeout % 1000) * 1000;
5176
5177 tbl.fd_count = 1;
5178 tbl.fd_array[0] = fd;
5179
5180 return ::select(1, &tbl, 0, 0, &t);
5181 }
5182
5183 int os::get_host_name(char* name, int namelen) {
5184 return ::gethostname(name, namelen);
5185 }
5186
5187 int os::socket_shutdown(int fd, int howto) {
5188 return ::shutdown(fd, howto);
5189 }
5190
5191 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
5192 return ::bind(fd, him, len);
5193 }
5194
5195 int os::get_sock_name(int fd, struct sockaddr* him, socklen_t* len) {
5196 return ::getsockname(fd, him, len);
5197 }
5198
5199 int os::get_sock_opt(int fd, int level, int optname,
5200 char* optval, socklen_t* optlen) {
5201 return ::getsockopt(fd, level, optname, optval, optlen);
5202 }
5203
5204 int os::set_sock_opt(int fd, int level, int optname,
5205 const char* optval, socklen_t optlen) {
5206 return ::setsockopt(fd, level, optname, optval, optlen);
5207 }
5208
5209 // WINDOWS CONTEXT Flags for THREAD_SAMPLING
5210 #if defined(IA32)
5211 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS)
5212 #elif defined (AMD64)
5213 # define sampling_context_flags (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
5214 #endif
5215
5216 // returns true if thread could be suspended,
5217 // false otherwise
5218 static bool do_suspend(HANDLE* h) {
5219 if (h != NULL) {
5220 if (SuspendThread(*h) != ~0) {
5221 return true;
5222 }
5223 }
5224 return false;
5225 }
5226
5227 // resume the thread
5228 // calling resume on an active thread is a no-op
5229 static void do_resume(HANDLE* h) {
5230 if (h != NULL) {
5231 ResumeThread(*h);
5232 }
5233 }
5234
5235 // retrieve a suspend/resume context capable handle
5236 // from the tid. Caller validates handle return value.
5237 void get_thread_handle_for_extended_context(HANDLE* h, OSThread::thread_id_t tid) {
5238 if (h != NULL) {
5239 *h = OpenThread(THREAD_SUSPEND_RESUME | THREAD_GET_CONTEXT | THREAD_QUERY_INFORMATION, FALSE, tid);
5240 }
5241 }
5242
5243 //
5244 // Thread sampling implementation
5245 //
5246 void os::SuspendedThreadTask::internal_do_task() {
5247 CONTEXT ctxt;
5248 HANDLE h = NULL;
5249
5250 // get context capable handle for thread
5251 get_thread_handle_for_extended_context(&h, _thread->osthread()->thread_id());
5252
5253 // sanity
5254 if (h == NULL || h == INVALID_HANDLE_VALUE) {
5255 return;
5256 }
5257
5258 // suspend the thread
5259 if (do_suspend(&h)) {
5260 ctxt.ContextFlags = sampling_context_flags;
5261 // get thread context
5262 GetThreadContext(h, &ctxt);
5263 SuspendedThreadTaskContext context(_thread, &ctxt);
5264 // pass context to Thread Sampling impl
5265 do_task(context);
5266 // resume thread
5267 do_resume(&h);
5268 }
5269
5270 // close handle
5271 CloseHandle(h);
5272 }
5273
5274
5275 // Kernel32 API
5276 typedef SIZE_T (WINAPI* GetLargePageMinimum_Fn)(void);
5277 typedef LPVOID (WINAPI *VirtualAllocExNuma_Fn) (HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
5278 typedef BOOL (WINAPI *GetNumaHighestNodeNumber_Fn) (PULONG);
5279 typedef BOOL (WINAPI *GetNumaNodeProcessorMask_Fn) (UCHAR, PULONGLONG);
5280 typedef USHORT (WINAPI* RtlCaptureStackBackTrace_Fn)(ULONG, ULONG, PVOID*, PULONG);
5281
5282 GetLargePageMinimum_Fn os::Kernel32Dll::_GetLargePageMinimum = NULL;
5283 VirtualAllocExNuma_Fn os::Kernel32Dll::_VirtualAllocExNuma = NULL;
5284 GetNumaHighestNodeNumber_Fn os::Kernel32Dll::_GetNumaHighestNodeNumber = NULL;
5285 GetNumaNodeProcessorMask_Fn os::Kernel32Dll::_GetNumaNodeProcessorMask = NULL;
5286 RtlCaptureStackBackTrace_Fn os::Kernel32Dll::_RtlCaptureStackBackTrace = NULL;
5287
5288
5289 BOOL os::Kernel32Dll::initialized = FALSE;
5290 SIZE_T os::Kernel32Dll::GetLargePageMinimum() {
5291 assert(initialized && _GetLargePageMinimum != NULL,
5292 "GetLargePageMinimumAvailable() not yet called");
5293 return _GetLargePageMinimum();
5294 }
5295
5296 BOOL os::Kernel32Dll::GetLargePageMinimumAvailable() {
5297 if (!initialized) {
5298 initialize();
5299 }
5300 return _GetLargePageMinimum != NULL;
5301 }
5302
5303 BOOL os::Kernel32Dll::NumaCallsAvailable() {
5304 if (!initialized) {
5305 initialize();
5306 }
5307 return _VirtualAllocExNuma != NULL;
5308 }
5309
5310 LPVOID os::Kernel32Dll::VirtualAllocExNuma(HANDLE hProc, LPVOID addr, SIZE_T bytes, DWORD flags, DWORD prot, DWORD node) {
5311 assert(initialized && _VirtualAllocExNuma != NULL,
5312 "NUMACallsAvailable() not yet called");
5313
5314 return _VirtualAllocExNuma(hProc, addr, bytes, flags, prot, node);
5315 }
5316
5317 BOOL os::Kernel32Dll::GetNumaHighestNodeNumber(PULONG ptr_highest_node_number) {
5318 assert(initialized && _GetNumaHighestNodeNumber != NULL,
5319 "NUMACallsAvailable() not yet called");
5320
5321 return _GetNumaHighestNodeNumber(ptr_highest_node_number);
5322 }
5323
5324 BOOL os::Kernel32Dll::GetNumaNodeProcessorMask(UCHAR node, PULONGLONG proc_mask) {
5325 assert(initialized && _GetNumaNodeProcessorMask != NULL,
5326 "NUMACallsAvailable() not yet called");
5327
5328 return _GetNumaNodeProcessorMask(node, proc_mask);
5329 }
5330
5331 USHORT os::Kernel32Dll::RtlCaptureStackBackTrace(ULONG FrameToSkip,
5332 ULONG FrameToCapture, PVOID* BackTrace, PULONG BackTraceHash) {
5333 if (!initialized) {
5334 initialize();
5335 }
5336
5337 if (_RtlCaptureStackBackTrace != NULL) {
5338 return _RtlCaptureStackBackTrace(FrameToSkip, FrameToCapture,
5339 BackTrace, BackTraceHash);
5340 } else {
5341 return 0;
5342 }
5343 }
5344
5345 void os::Kernel32Dll::initializeCommon() {
5346 if (!initialized) {
5347 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5348 assert(handle != NULL, "Just check");
5349 _GetLargePageMinimum = (GetLargePageMinimum_Fn)::GetProcAddress(handle, "GetLargePageMinimum");
5350 _VirtualAllocExNuma = (VirtualAllocExNuma_Fn)::GetProcAddress(handle, "VirtualAllocExNuma");
5351 _GetNumaHighestNodeNumber = (GetNumaHighestNodeNumber_Fn)::GetProcAddress(handle, "GetNumaHighestNodeNumber");
5352 _GetNumaNodeProcessorMask = (GetNumaNodeProcessorMask_Fn)::GetProcAddress(handle, "GetNumaNodeProcessorMask");
5353 _RtlCaptureStackBackTrace = (RtlCaptureStackBackTrace_Fn)::GetProcAddress(handle, "RtlCaptureStackBackTrace");
5354 initialized = TRUE;
5355 }
5356 }
5357
5358
5359
5360 #ifndef JDK6_OR_EARLIER
5361
5362 void os::Kernel32Dll::initialize() {
5363 initializeCommon();
5364 }
5365
5366
5367 // Kernel32 API
5368 inline BOOL os::Kernel32Dll::SwitchToThread() {
5369 return ::SwitchToThread();
5370 }
5371
5372 inline BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5373 return true;
5374 }
5375
5376 // Help tools
5377 inline BOOL os::Kernel32Dll::HelpToolsAvailable() {
5378 return true;
5379 }
5380
5381 inline HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5382 return ::CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5383 }
5384
5385 inline BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5386 return ::Module32First(hSnapshot, lpme);
5387 }
5388
5389 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5390 return ::Module32Next(hSnapshot, lpme);
5391 }
5392
5393 inline void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5394 ::GetNativeSystemInfo(lpSystemInfo);
5395 }
5396
5397 // PSAPI API
5398 inline BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5399 return ::EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5400 }
5401
5402 inline DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5403 return ::GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5404 }
5405
5406 inline BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5407 return ::GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5408 }
5409
5410 inline BOOL os::PSApiDll::PSApiAvailable() {
5411 return true;
5412 }
5413
5414
5415 // WinSock2 API
5416 inline BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5417 return ::WSAStartup(wVersionRequested, lpWSAData);
5418 }
5419
5420 inline struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5421 return ::gethostbyname(name);
5422 }
5423
5424 inline BOOL os::WinSock2Dll::WinSock2Available() {
5425 return true;
5426 }
5427
5428 // Advapi API
5429 inline BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5430 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5431 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5432 return ::AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5433 BufferLength, PreviousState, ReturnLength);
5434 }
5435
5436 inline BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5437 PHANDLE TokenHandle) {
5438 return ::OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5439 }
5440
5441 inline BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5442 return ::LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5443 }
5444
5445 inline BOOL os::Advapi32Dll::AdvapiAvailable() {
5446 return true;
5447 }
5448
5449 void* os::get_default_process_handle() {
5450 return (void*)GetModuleHandle(NULL);
5451 }
5452
5453 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
5454 // which is used to find statically linked in agents.
5455 // Additionally for windows, takes into account __stdcall names.
5456 // Parameters:
5457 // sym_name: Symbol in library we are looking for
5458 // lib_name: Name of library to look in, NULL for shared libs.
5459 // is_absolute_path == true if lib_name is absolute path to agent
5460 // such as "C:/a/b/L.dll"
5461 // == false if only the base name of the library is passed in
5462 // such as "L"
5463 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
5464 bool is_absolute_path) {
5465 char *agent_entry_name;
5466 size_t len;
5467 size_t name_len;
5468 size_t prefix_len = strlen(JNI_LIB_PREFIX);
5469 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
5470 const char *start;
5471
5472 if (lib_name != NULL) {
5473 len = name_len = strlen(lib_name);
5474 if (is_absolute_path) {
5475 // Need to strip path, prefix and suffix
5476 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
5477 lib_name = ++start;
5478 } else {
5479 // Need to check for drive prefix
5480 if ((start = strchr(lib_name, ':')) != NULL) {
5481 lib_name = ++start;
5482 }
5483 }
5484 if (len <= (prefix_len + suffix_len)) {
5485 return NULL;
5486 }
5487 lib_name += prefix_len;
5488 name_len = strlen(lib_name) - suffix_len;
5489 }
5490 }
5491 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
5492 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
5493 if (agent_entry_name == NULL) {
5494 return NULL;
5495 }
5496 if (lib_name != NULL) {
5497 const char *p = strrchr(sym_name, '@');
5498 if (p != NULL && p != sym_name) {
5499 // sym_name == _Agent_OnLoad@XX
5500 strncpy(agent_entry_name, sym_name, (p - sym_name));
5501 agent_entry_name[(p-sym_name)] = '\0';
5502 // agent_entry_name == _Agent_OnLoad
5503 strcat(agent_entry_name, "_");
5504 strncat(agent_entry_name, lib_name, name_len);
5505 strcat(agent_entry_name, p);
5506 // agent_entry_name == _Agent_OnLoad_lib_name@XX
5507 } else {
5508 strcpy(agent_entry_name, sym_name);
5509 strcat(agent_entry_name, "_");
5510 strncat(agent_entry_name, lib_name, name_len);
5511 }
5512 } else {
5513 strcpy(agent_entry_name, sym_name);
5514 }
5515 return agent_entry_name;
5516 }
5517
5518 #else
5519 // Kernel32 API
5520 typedef BOOL (WINAPI* SwitchToThread_Fn)(void);
5521 typedef HANDLE (WINAPI* CreateToolhelp32Snapshot_Fn)(DWORD,DWORD);
5522 typedef BOOL (WINAPI* Module32First_Fn)(HANDLE,LPMODULEENTRY32);
5523 typedef BOOL (WINAPI* Module32Next_Fn)(HANDLE,LPMODULEENTRY32);
5524 typedef void (WINAPI* GetNativeSystemInfo_Fn)(LPSYSTEM_INFO);
5525
5526 SwitchToThread_Fn os::Kernel32Dll::_SwitchToThread = NULL;
5527 CreateToolhelp32Snapshot_Fn os::Kernel32Dll::_CreateToolhelp32Snapshot = NULL;
5528 Module32First_Fn os::Kernel32Dll::_Module32First = NULL;
5529 Module32Next_Fn os::Kernel32Dll::_Module32Next = NULL;
5530 GetNativeSystemInfo_Fn os::Kernel32Dll::_GetNativeSystemInfo = NULL;
5531
5532 void os::Kernel32Dll::initialize() {
5533 if (!initialized) {
5534 HMODULE handle = ::GetModuleHandle("Kernel32.dll");
5535 assert(handle != NULL, "Just check");
5536
5537 _SwitchToThread = (SwitchToThread_Fn)::GetProcAddress(handle, "SwitchToThread");
5538 _CreateToolhelp32Snapshot = (CreateToolhelp32Snapshot_Fn)
5539 ::GetProcAddress(handle, "CreateToolhelp32Snapshot");
5540 _Module32First = (Module32First_Fn)::GetProcAddress(handle, "Module32First");
5541 _Module32Next = (Module32Next_Fn)::GetProcAddress(handle, "Module32Next");
5542 _GetNativeSystemInfo = (GetNativeSystemInfo_Fn)::GetProcAddress(handle, "GetNativeSystemInfo");
5543 initializeCommon(); // resolve the functions that always need resolving
5544
5545 initialized = TRUE;
5546 }
5547 }
5548
5549 BOOL os::Kernel32Dll::SwitchToThread() {
5550 assert(initialized && _SwitchToThread != NULL,
5551 "SwitchToThreadAvailable() not yet called");
5552 return _SwitchToThread();
5553 }
5554
5555
5556 BOOL os::Kernel32Dll::SwitchToThreadAvailable() {
5557 if (!initialized) {
5558 initialize();
5559 }
5560 return _SwitchToThread != NULL;
5561 }
5562
5563 // Help tools
5564 BOOL os::Kernel32Dll::HelpToolsAvailable() {
5565 if (!initialized) {
5566 initialize();
5567 }
5568 return _CreateToolhelp32Snapshot != NULL &&
5569 _Module32First != NULL &&
5570 _Module32Next != NULL;
5571 }
5572
5573 HANDLE os::Kernel32Dll::CreateToolhelp32Snapshot(DWORD dwFlags,DWORD th32ProcessId) {
5574 assert(initialized && _CreateToolhelp32Snapshot != NULL,
5575 "HelpToolsAvailable() not yet called");
5576
5577 return _CreateToolhelp32Snapshot(dwFlags, th32ProcessId);
5578 }
5579
5580 BOOL os::Kernel32Dll::Module32First(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5581 assert(initialized && _Module32First != NULL,
5582 "HelpToolsAvailable() not yet called");
5583
5584 return _Module32First(hSnapshot, lpme);
5585 }
5586
5587 inline BOOL os::Kernel32Dll::Module32Next(HANDLE hSnapshot,LPMODULEENTRY32 lpme) {
5588 assert(initialized && _Module32Next != NULL,
5589 "HelpToolsAvailable() not yet called");
5590
5591 return _Module32Next(hSnapshot, lpme);
5592 }
5593
5594
5595 BOOL os::Kernel32Dll::GetNativeSystemInfoAvailable() {
5596 if (!initialized) {
5597 initialize();
5598 }
5599 return _GetNativeSystemInfo != NULL;
5600 }
5601
5602 void os::Kernel32Dll::GetNativeSystemInfo(LPSYSTEM_INFO lpSystemInfo) {
5603 assert(initialized && _GetNativeSystemInfo != NULL,
5604 "GetNativeSystemInfoAvailable() not yet called");
5605
5606 _GetNativeSystemInfo(lpSystemInfo);
5607 }
5608
5609 // PSAPI API
5610
5611
5612 typedef BOOL (WINAPI *EnumProcessModules_Fn)(HANDLE, HMODULE *, DWORD, LPDWORD);
5613 typedef BOOL (WINAPI *GetModuleFileNameEx_Fn)(HANDLE, HMODULE, LPTSTR, DWORD);;
5614 typedef BOOL (WINAPI *GetModuleInformation_Fn)(HANDLE, HMODULE, LPMODULEINFO, DWORD);
5615
5616 EnumProcessModules_Fn os::PSApiDll::_EnumProcessModules = NULL;
5617 GetModuleFileNameEx_Fn os::PSApiDll::_GetModuleFileNameEx = NULL;
5618 GetModuleInformation_Fn os::PSApiDll::_GetModuleInformation = NULL;
5619 BOOL os::PSApiDll::initialized = FALSE;
5620
5621 void os::PSApiDll::initialize() {
5622 if (!initialized) {
5623 HMODULE handle = os::win32::load_Windows_dll("PSAPI.DLL", NULL, 0);
5624 if (handle != NULL) {
5625 _EnumProcessModules = (EnumProcessModules_Fn)::GetProcAddress(handle,
5626 "EnumProcessModules");
5627 _GetModuleFileNameEx = (GetModuleFileNameEx_Fn)::GetProcAddress(handle,
5628 "GetModuleFileNameExA");
5629 _GetModuleInformation = (GetModuleInformation_Fn)::GetProcAddress(handle,
5630 "GetModuleInformation");
5631 }
5632 initialized = TRUE;
5633 }
5634 }
5635
5636
5637
5638 BOOL os::PSApiDll::EnumProcessModules(HANDLE hProcess, HMODULE *lpModule, DWORD cb, LPDWORD lpcbNeeded) {
5639 assert(initialized && _EnumProcessModules != NULL,
5640 "PSApiAvailable() not yet called");
5641 return _EnumProcessModules(hProcess, lpModule, cb, lpcbNeeded);
5642 }
5643
5644 DWORD os::PSApiDll::GetModuleFileNameEx(HANDLE hProcess, HMODULE hModule, LPTSTR lpFilename, DWORD nSize) {
5645 assert(initialized && _GetModuleFileNameEx != NULL,
5646 "PSApiAvailable() not yet called");
5647 return _GetModuleFileNameEx(hProcess, hModule, lpFilename, nSize);
5648 }
5649
5650 BOOL os::PSApiDll::GetModuleInformation(HANDLE hProcess, HMODULE hModule, LPMODULEINFO lpmodinfo, DWORD cb) {
5651 assert(initialized && _GetModuleInformation != NULL,
5652 "PSApiAvailable() not yet called");
5653 return _GetModuleInformation(hProcess, hModule, lpmodinfo, cb);
5654 }
5655
5656 BOOL os::PSApiDll::PSApiAvailable() {
5657 if (!initialized) {
5658 initialize();
5659 }
5660 return _EnumProcessModules != NULL &&
5661 _GetModuleFileNameEx != NULL &&
5662 _GetModuleInformation != NULL;
5663 }
5664
5665
5666 // WinSock2 API
5667 typedef int (PASCAL FAR* WSAStartup_Fn)(WORD, LPWSADATA);
5668 typedef struct hostent *(PASCAL FAR *gethostbyname_Fn)(...);
5669
5670 WSAStartup_Fn os::WinSock2Dll::_WSAStartup = NULL;
5671 gethostbyname_Fn os::WinSock2Dll::_gethostbyname = NULL;
5672 BOOL os::WinSock2Dll::initialized = FALSE;
5673
5674 void os::WinSock2Dll::initialize() {
5675 if (!initialized) {
5676 HMODULE handle = os::win32::load_Windows_dll("ws2_32.dll", NULL, 0);
5677 if (handle != NULL) {
5678 _WSAStartup = (WSAStartup_Fn)::GetProcAddress(handle, "WSAStartup");
5679 _gethostbyname = (gethostbyname_Fn)::GetProcAddress(handle, "gethostbyname");
5680 }
5681 initialized = TRUE;
5682 }
5683 }
5684
5685
5686 BOOL os::WinSock2Dll::WSAStartup(WORD wVersionRequested, LPWSADATA lpWSAData) {
5687 assert(initialized && _WSAStartup != NULL,
5688 "WinSock2Available() not yet called");
5689 return _WSAStartup(wVersionRequested, lpWSAData);
5690 }
5691
5692 struct hostent* os::WinSock2Dll::gethostbyname(const char *name) {
5693 assert(initialized && _gethostbyname != NULL,
5694 "WinSock2Available() not yet called");
5695 return _gethostbyname(name);
5696 }
5697
5698 BOOL os::WinSock2Dll::WinSock2Available() {
5699 if (!initialized) {
5700 initialize();
5701 }
5702 return _WSAStartup != NULL &&
5703 _gethostbyname != NULL;
5704 }
5705
5706 typedef BOOL (WINAPI *AdjustTokenPrivileges_Fn)(HANDLE, BOOL, PTOKEN_PRIVILEGES, DWORD, PTOKEN_PRIVILEGES, PDWORD);
5707 typedef BOOL (WINAPI *OpenProcessToken_Fn)(HANDLE, DWORD, PHANDLE);
5708 typedef BOOL (WINAPI *LookupPrivilegeValue_Fn)(LPCTSTR, LPCTSTR, PLUID);
5709
5710 AdjustTokenPrivileges_Fn os::Advapi32Dll::_AdjustTokenPrivileges = NULL;
5711 OpenProcessToken_Fn os::Advapi32Dll::_OpenProcessToken = NULL;
5712 LookupPrivilegeValue_Fn os::Advapi32Dll::_LookupPrivilegeValue = NULL;
5713 BOOL os::Advapi32Dll::initialized = FALSE;
5714
5715 void os::Advapi32Dll::initialize() {
5716 if (!initialized) {
5717 HMODULE handle = os::win32::load_Windows_dll("advapi32.dll", NULL, 0);
5718 if (handle != NULL) {
5719 _AdjustTokenPrivileges = (AdjustTokenPrivileges_Fn)::GetProcAddress(handle,
5720 "AdjustTokenPrivileges");
5721 _OpenProcessToken = (OpenProcessToken_Fn)::GetProcAddress(handle,
5722 "OpenProcessToken");
5723 _LookupPrivilegeValue = (LookupPrivilegeValue_Fn)::GetProcAddress(handle,
5724 "LookupPrivilegeValueA");
5725 }
5726 initialized = TRUE;
5727 }
5728 }
5729
5730 BOOL os::Advapi32Dll::AdjustTokenPrivileges(HANDLE TokenHandle,
5731 BOOL DisableAllPrivileges, PTOKEN_PRIVILEGES NewState, DWORD BufferLength,
5732 PTOKEN_PRIVILEGES PreviousState, PDWORD ReturnLength) {
5733 assert(initialized && _AdjustTokenPrivileges != NULL,
5734 "AdvapiAvailable() not yet called");
5735 return _AdjustTokenPrivileges(TokenHandle, DisableAllPrivileges, NewState,
5736 BufferLength, PreviousState, ReturnLength);
5737 }
5738
5739 BOOL os::Advapi32Dll::OpenProcessToken(HANDLE ProcessHandle, DWORD DesiredAccess,
5740 PHANDLE TokenHandle) {
5741 assert(initialized && _OpenProcessToken != NULL,
5742 "AdvapiAvailable() not yet called");
5743 return _OpenProcessToken(ProcessHandle, DesiredAccess, TokenHandle);
5744 }
5745
5746 BOOL os::Advapi32Dll::LookupPrivilegeValue(LPCTSTR lpSystemName, LPCTSTR lpName, PLUID lpLuid) {
5747 assert(initialized && _LookupPrivilegeValue != NULL,
5748 "AdvapiAvailable() not yet called");
5749 return _LookupPrivilegeValue(lpSystemName, lpName, lpLuid);
5750 }
5751
5752 BOOL os::Advapi32Dll::AdvapiAvailable() {
5753 if (!initialized) {
5754 initialize();
5755 }
5756 return _AdjustTokenPrivileges != NULL &&
5757 _OpenProcessToken != NULL &&
5758 _LookupPrivilegeValue != NULL;
5759 }
5760
5761 #endif
5762
5763 #ifndef PRODUCT
5764
5765 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5766 // contiguous memory block at a particular address.
5767 // The test first tries to find a good approximate address to allocate at by using the same
5768 // method to allocate some memory at any address. The test then tries to allocate memory in
5769 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5770 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5771 // the previously allocated memory is available for allocation. The only actual failure
5772 // that is reported is when the test tries to allocate at a particular location but gets a
5773 // different valid one. A NULL return value at this point is not considered an error but may
5774 // be legitimate.
5775 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5776 void TestReserveMemorySpecial_test() {
5777 if (!UseLargePages) {
5778 if (VerboseInternalVMTests) {
5779 gclog_or_tty->print("Skipping test because large pages are disabled");
5780 }
5781 return;
5782 }
5783 // save current value of globals
5784 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5785 bool old_use_numa_interleaving = UseNUMAInterleaving;
5786
5787 // set globals to make sure we hit the correct code path
5788 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5789
5790 // do an allocation at an address selected by the OS to get a good one.
5791 const size_t large_allocation_size = os::large_page_size() * 4;
5792 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5793 if (result == NULL) {
5794 if (VerboseInternalVMTests) {
5795 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.",
5796 large_allocation_size);
5797 }
5798 } else {
5799 os::release_memory_special(result, large_allocation_size);
5800
5801 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5802 // we managed to get it once.
5803 const size_t expected_allocation_size = os::large_page_size();
5804 char* expected_location = result + os::large_page_size();
5805 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5806 if (actual_location == NULL) {
5807 if (VerboseInternalVMTests) {
5808 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.",
5809 expected_location, large_allocation_size);
5810 }
5811 } else {
5812 // release memory
5813 os::release_memory_special(actual_location, expected_allocation_size);
5814 // only now check, after releasing any memory to avoid any leaks.
5815 assert(actual_location == expected_location,
5816 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead",
5817 expected_location, expected_allocation_size, actual_location));
5818 }
5819 }
5820
5821 // restore globals
5822 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5823 UseNUMAInterleaving = old_use_numa_interleaving;
5824 }
5825 #endif // PRODUCT
5826