Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/os.cpp @ 2162:ccfcb502af3f
6566340: Restore use of stillborn flag to signify a thread that was stopped before it started
Summary: Restore use of stillborn flag
Reviewed-by: acorn, alanb
author | dholmes |
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date | Tue, 25 Jan 2011 00:14:21 -0500 |
parents | 828eafbd85cc |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
1907 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/icBuffer.hpp" | |
31 #include "code/vtableStubs.hpp" | |
32 #include "gc_implementation/shared/vmGCOperations.hpp" | |
33 #include "interpreter/interpreter.hpp" | |
34 #include "memory/allocation.inline.hpp" | |
35 #include "oops/oop.inline.hpp" | |
36 #include "prims/jvm.h" | |
37 #include "prims/jvm_misc.hpp" | |
38 #include "prims/privilegedStack.hpp" | |
39 #include "runtime/arguments.hpp" | |
40 #include "runtime/frame.inline.hpp" | |
41 #include "runtime/interfaceSupport.hpp" | |
42 #include "runtime/java.hpp" | |
43 #include "runtime/javaCalls.hpp" | |
44 #include "runtime/mutexLocker.hpp" | |
45 #include "runtime/os.hpp" | |
46 #include "runtime/stubRoutines.hpp" | |
47 #include "services/attachListener.hpp" | |
48 #include "services/threadService.hpp" | |
49 #include "utilities/defaultStream.hpp" | |
50 #include "utilities/events.hpp" | |
51 #ifdef TARGET_OS_FAMILY_linux | |
52 # include "os_linux.inline.hpp" | |
53 # include "thread_linux.inline.hpp" | |
54 #endif | |
55 #ifdef TARGET_OS_FAMILY_solaris | |
56 # include "os_solaris.inline.hpp" | |
57 # include "thread_solaris.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_OS_FAMILY_windows | |
60 # include "os_windows.inline.hpp" | |
61 # include "thread_windows.inline.hpp" | |
62 #endif | |
0 | 63 |
64 # include <signal.h> | |
65 | |
66 OSThread* os::_starting_thread = NULL; | |
67 address os::_polling_page = NULL; | |
68 volatile int32_t* os::_mem_serialize_page = NULL; | |
69 uintptr_t os::_serialize_page_mask = 0; | |
70 long os::_rand_seed = 1; | |
71 int os::_processor_count = 0; | |
72 size_t os::_page_sizes[os::page_sizes_max]; | |
73 | |
74 #ifndef PRODUCT | |
75 int os::num_mallocs = 0; // # of calls to malloc/realloc | |
76 size_t os::alloc_bytes = 0; // # of bytes allocated | |
77 int os::num_frees = 0; // # of calls to free | |
78 #endif | |
79 | |
80 // Fill in buffer with current local time as an ISO-8601 string. | |
81 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
82 // Returns buffer, or NULL if it failed. | |
83 // This would mostly be a call to | |
84 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
85 // except that on Windows the %z behaves badly, so we do it ourselves. | |
86 // Also, people wanted milliseconds on there, | |
87 // and strftime doesn't do milliseconds. | |
88 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
89 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
90 // 1 2 | |
91 // 12345678901234567890123456789 | |
92 static const char* iso8601_format = | |
93 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
94 static const size_t needed_buffer = 29; | |
95 | |
96 // Sanity check the arguments | |
97 if (buffer == NULL) { | |
98 assert(false, "NULL buffer"); | |
99 return NULL; | |
100 } | |
101 if (buffer_length < needed_buffer) { | |
102 assert(false, "buffer_length too small"); | |
103 return NULL; | |
104 } | |
105 // Get the current time | |
61 | 106 jlong milliseconds_since_19700101 = javaTimeMillis(); |
0 | 107 const int milliseconds_per_microsecond = 1000; |
108 const time_t seconds_since_19700101 = | |
109 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
110 const int milliseconds_after_second = | |
111 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
112 // Convert the time value to a tm and timezone variable | |
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113 struct tm time_struct; |
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114 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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115 assert(false, "Failed localtime_pd"); |
0 | 116 return NULL; |
117 } | |
118 const time_t zone = timezone; | |
119 | |
120 // If daylight savings time is in effect, | |
121 // we are 1 hour East of our time zone | |
122 const time_t seconds_per_minute = 60; | |
123 const time_t minutes_per_hour = 60; | |
124 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
125 time_t UTC_to_local = zone; | |
126 if (time_struct.tm_isdst > 0) { | |
127 UTC_to_local = UTC_to_local - seconds_per_hour; | |
128 } | |
129 // Compute the time zone offset. | |
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130 // localtime_pd() sets timezone to the difference (in seconds) |
0 | 131 // between UTC and and local time. |
132 // ISO 8601 says we need the difference between local time and UTC, | |
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133 // we change the sign of the localtime_pd() result. |
0 | 134 const time_t local_to_UTC = -(UTC_to_local); |
135 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
136 char sign_local_to_UTC = '+'; | |
137 time_t abs_local_to_UTC = local_to_UTC; | |
138 if (local_to_UTC < 0) { | |
139 sign_local_to_UTC = '-'; | |
140 abs_local_to_UTC = -(abs_local_to_UTC); | |
141 } | |
142 // Convert time zone offset seconds to hours and minutes. | |
143 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
144 const time_t zone_min = | |
145 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
146 | |
147 // Print an ISO 8601 date and time stamp into the buffer | |
148 const int year = 1900 + time_struct.tm_year; | |
149 const int month = 1 + time_struct.tm_mon; | |
150 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
151 year, | |
152 month, | |
153 time_struct.tm_mday, | |
154 time_struct.tm_hour, | |
155 time_struct.tm_min, | |
156 time_struct.tm_sec, | |
157 milliseconds_after_second, | |
158 sign_local_to_UTC, | |
159 zone_hours, | |
160 zone_min); | |
161 if (printed == 0) { | |
162 assert(false, "Failed jio_printf"); | |
163 return NULL; | |
164 } | |
165 return buffer; | |
166 } | |
167 | |
168 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
169 #ifdef ASSERT | |
170 if (!(!thread->is_Java_thread() || | |
171 Thread::current() == thread || | |
172 Threads_lock->owned_by_self() | |
173 || thread->is_Compiler_thread() | |
174 )) { | |
175 assert(false, "possibility of dangling Thread pointer"); | |
176 } | |
177 #endif | |
178 | |
179 if (p >= MinPriority && p <= MaxPriority) { | |
180 int priority = java_to_os_priority[p]; | |
181 return set_native_priority(thread, priority); | |
182 } else { | |
183 assert(false, "Should not happen"); | |
184 return OS_ERR; | |
185 } | |
186 } | |
187 | |
188 | |
189 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { | |
190 int p; | |
191 int os_prio; | |
192 OSReturn ret = get_native_priority(thread, &os_prio); | |
193 if (ret != OS_OK) return ret; | |
194 | |
195 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
196 priority = (ThreadPriority)p; | |
197 return OS_OK; | |
198 } | |
199 | |
200 | |
201 // --------------------- sun.misc.Signal (optional) --------------------- | |
202 | |
203 | |
204 // SIGBREAK is sent by the keyboard to query the VM state | |
205 #ifndef SIGBREAK | |
206 #define SIGBREAK SIGQUIT | |
207 #endif | |
208 | |
209 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
210 | |
211 | |
212 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
213 os::set_priority(thread, NearMaxPriority); | |
214 while (true) { | |
215 int sig; | |
216 { | |
217 // FIXME : Currently we have not decieded what should be the status | |
218 // for this java thread blocked here. Once we decide about | |
219 // that we should fix this. | |
220 sig = os::signal_wait(); | |
221 } | |
222 if (sig == os::sigexitnum_pd()) { | |
223 // Terminate the signal thread | |
224 return; | |
225 } | |
226 | |
227 switch (sig) { | |
228 case SIGBREAK: { | |
229 // Check if the signal is a trigger to start the Attach Listener - in that | |
230 // case don't print stack traces. | |
231 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
232 continue; | |
233 } | |
234 // Print stack traces | |
235 // Any SIGBREAK operations added here should make sure to flush | |
236 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
237 // Each module also prints an extra carriage return after its output. | |
238 VM_PrintThreads op; | |
239 VMThread::execute(&op); | |
240 VM_PrintJNI jni_op; | |
241 VMThread::execute(&jni_op); | |
242 VM_FindDeadlocks op1(tty); | |
243 VMThread::execute(&op1); | |
244 Universe::print_heap_at_SIGBREAK(); | |
245 if (PrintClassHistogram) { | |
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246 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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247 true /* need_prologue */); |
0 | 248 VMThread::execute(&op1); |
249 } | |
250 if (JvmtiExport::should_post_data_dump()) { | |
251 JvmtiExport::post_data_dump(); | |
252 } | |
253 break; | |
254 } | |
255 default: { | |
256 // Dispatch the signal to java | |
257 HandleMark hm(THREAD); | |
258 klassOop k = SystemDictionary::resolve_or_null(vmSymbolHandles::sun_misc_Signal(), THREAD); | |
259 KlassHandle klass (THREAD, k); | |
260 if (klass.not_null()) { | |
261 JavaValue result(T_VOID); | |
262 JavaCallArguments args; | |
263 args.push_int(sig); | |
264 JavaCalls::call_static( | |
265 &result, | |
266 klass, | |
267 vmSymbolHandles::dispatch_name(), | |
268 vmSymbolHandles::int_void_signature(), | |
269 &args, | |
270 THREAD | |
271 ); | |
272 } | |
273 if (HAS_PENDING_EXCEPTION) { | |
274 // tty is initialized early so we don't expect it to be null, but | |
275 // if it is we can't risk doing an initialization that might | |
276 // trigger additional out-of-memory conditions | |
277 if (tty != NULL) { | |
278 char klass_name[256]; | |
279 char tmp_sig_name[16]; | |
280 const char* sig_name = "UNKNOWN"; | |
281 instanceKlass::cast(PENDING_EXCEPTION->klass())-> | |
282 name()->as_klass_external_name(klass_name, 256); | |
283 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
284 sig_name = tmp_sig_name; | |
285 warning("Exception %s occurred dispatching signal %s to handler" | |
286 "- the VM may need to be forcibly terminated", | |
287 klass_name, sig_name ); | |
288 } | |
289 CLEAR_PENDING_EXCEPTION; | |
290 } | |
291 } | |
292 } | |
293 } | |
294 } | |
295 | |
296 | |
297 void os::signal_init() { | |
298 if (!ReduceSignalUsage) { | |
299 // Setup JavaThread for processing signals | |
300 EXCEPTION_MARK; | |
301 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
302 instanceKlassHandle klass (THREAD, k); | |
303 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
304 | |
305 const char thread_name[] = "Signal Dispatcher"; | |
306 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
307 | |
308 // Initialize thread_oop to put it into the system threadGroup | |
309 Handle thread_group (THREAD, Universe::system_thread_group()); | |
310 JavaValue result(T_VOID); | |
311 JavaCalls::call_special(&result, thread_oop, | |
312 klass, | |
313 vmSymbolHandles::object_initializer_name(), | |
314 vmSymbolHandles::threadgroup_string_void_signature(), | |
315 thread_group, | |
316 string, | |
317 CHECK); | |
318 | |
1142 | 319 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 320 JavaCalls::call_special(&result, |
321 thread_group, | |
322 group, | |
323 vmSymbolHandles::add_method_name(), | |
324 vmSymbolHandles::thread_void_signature(), | |
325 thread_oop, // ARG 1 | |
326 CHECK); | |
327 | |
328 os::signal_init_pd(); | |
329 | |
330 { MutexLocker mu(Threads_lock); | |
331 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
332 | |
333 // At this point it may be possible that no osthread was created for the | |
334 // JavaThread due to lack of memory. We would have to throw an exception | |
335 // in that case. However, since this must work and we do not allow | |
336 // exceptions anyway, check and abort if this fails. | |
337 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
338 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
339 "unable to create new native thread"); | |
340 } | |
341 | |
342 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
343 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
344 java_lang_Thread::set_daemon(thread_oop()); | |
345 | |
346 signal_thread->set_threadObj(thread_oop()); | |
347 Threads::add(signal_thread); | |
348 Thread::start(signal_thread); | |
349 } | |
350 // Handle ^BREAK | |
351 os::signal(SIGBREAK, os::user_handler()); | |
352 } | |
353 } | |
354 | |
355 | |
356 void os::terminate_signal_thread() { | |
357 if (!ReduceSignalUsage) | |
358 signal_notify(sigexitnum_pd()); | |
359 } | |
360 | |
361 | |
362 // --------------------- loading libraries --------------------- | |
363 | |
364 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
365 extern struct JavaVM_ main_vm; | |
366 | |
367 static void* _native_java_library = NULL; | |
368 | |
369 void* os::native_java_library() { | |
370 if (_native_java_library == NULL) { | |
371 char buffer[JVM_MAXPATHLEN]; | |
372 char ebuf[1024]; | |
373 | |
242 | 374 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
375 // always able to find it when the loading executable is outside the JDK. | |
0 | 376 // In order to keep working with 1.2 we ignore any loading errors. |
242 | 377 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"); |
378 dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 379 |
380 // Load java dll | |
242 | 381 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java"); |
382 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 383 if (_native_java_library == NULL) { |
384 vm_exit_during_initialization("Unable to load native library", ebuf); | |
385 } | |
242 | 386 } |
387 static jboolean onLoaded = JNI_FALSE; | |
388 if (onLoaded) { | |
389 // We may have to wait to fire OnLoad until TLS is initialized. | |
390 if (ThreadLocalStorage::is_initialized()) { | |
391 // The JNI_OnLoad handling is normally done by method load in | |
392 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
393 // explicitly so we have to check for JNI_OnLoad as well | |
394 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
395 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
396 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
397 if (JNI_OnLoad != NULL) { | |
398 JavaThread* thread = JavaThread::current(); | |
399 ThreadToNativeFromVM ttn(thread); | |
400 HandleMark hm(thread); | |
401 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
402 onLoaded = JNI_TRUE; | |
403 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
404 vm_exit_during_initialization("Unsupported JNI version"); | |
405 } | |
0 | 406 } |
407 } | |
408 } | |
409 return _native_java_library; | |
410 } | |
411 | |
412 // --------------------- heap allocation utilities --------------------- | |
413 | |
414 char *os::strdup(const char *str) { | |
415 size_t size = strlen(str); | |
416 char *dup_str = (char *)malloc(size + 1); | |
417 if (dup_str == NULL) return NULL; | |
418 strcpy(dup_str, str); | |
419 return dup_str; | |
420 } | |
421 | |
422 | |
423 | |
424 #ifdef ASSERT | |
425 #define space_before (MallocCushion + sizeof(double)) | |
426 #define space_after MallocCushion | |
427 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
428 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
429 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
430 // NB: cannot be debug variable, because these aren't set from the command line until | |
431 // *after* the first few allocs already happened | |
432 #define MallocCushion 16 | |
433 #else | |
434 #define space_before 0 | |
435 #define space_after 0 | |
436 #define size_addr_from_base(p) should not use w/o ASSERT | |
437 #define size_addr_from_obj(p) should not use w/o ASSERT | |
438 #define MallocCushion 0 | |
439 #endif | |
440 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
441 | |
442 #ifdef ASSERT | |
443 inline size_t get_size(void* obj) { | |
444 size_t size = *size_addr_from_obj(obj); | |
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445 if (size < 0) { |
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446 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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447 SIZE_FORMAT ")", obj, size)); |
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448 } |
0 | 449 return size; |
450 } | |
451 | |
452 u_char* find_cushion_backwards(u_char* start) { | |
453 u_char* p = start; | |
454 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
455 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
456 // ok, we have four consecutive marker bytes; find start | |
457 u_char* q = p - 4; | |
458 while (*q == badResourceValue) q--; | |
459 return q + 1; | |
460 } | |
461 | |
462 u_char* find_cushion_forwards(u_char* start) { | |
463 u_char* p = start; | |
464 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
465 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
466 // ok, we have four consecutive marker bytes; find end of cushion | |
467 u_char* q = p + 4; | |
468 while (*q == badResourceValue) q++; | |
469 return q - MallocCushion; | |
470 } | |
471 | |
472 void print_neighbor_blocks(void* ptr) { | |
473 // find block allocated before ptr (not entirely crash-proof) | |
474 if (MallocCushion < 4) { | |
475 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
476 return; | |
477 } | |
478 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
479 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
480 // look for cushion in front of prev. block | |
481 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
482 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
483 u_char* obj = start_of_prev_block + space_before; | |
484 if (size <= 0 ) { | |
485 // start is bad; mayhave been confused by OS data inbetween objects | |
486 // search one more backwards | |
487 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
488 size = *size_addr_from_base(start_of_prev_block); | |
489 obj = start_of_prev_block + space_before; | |
490 } | |
491 | |
492 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
493 tty->print_cr("### previous object: %p (%ld bytes)", obj, size); | |
494 } else { | |
495 tty->print_cr("### previous object (not sure if correct): %p (%ld bytes)", obj, size); | |
496 } | |
497 | |
498 // now find successor block | |
499 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
500 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
501 u_char* next_obj = start_of_next_block + space_before; | |
502 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
503 if (start_of_next_block[0] == badResourceValue && | |
504 start_of_next_block[1] == badResourceValue && | |
505 start_of_next_block[2] == badResourceValue && | |
506 start_of_next_block[3] == badResourceValue) { | |
507 tty->print_cr("### next object: %p (%ld bytes)", next_obj, next_size); | |
508 } else { | |
509 tty->print_cr("### next object (not sure if correct): %p (%ld bytes)", next_obj, next_size); | |
510 } | |
511 } | |
512 | |
513 | |
514 void report_heap_error(void* memblock, void* bad, const char* where) { | |
515 tty->print_cr("## nof_mallocs = %d, nof_frees = %d", os::num_mallocs, os::num_frees); | |
516 tty->print_cr("## memory stomp: byte at %p %s object %p", bad, where, memblock); | |
517 print_neighbor_blocks(memblock); | |
518 fatal("memory stomping error"); | |
519 } | |
520 | |
521 void verify_block(void* memblock) { | |
522 size_t size = get_size(memblock); | |
523 if (MallocCushion) { | |
524 u_char* ptr = (u_char*)memblock - space_before; | |
525 for (int i = 0; i < MallocCushion; i++) { | |
526 if (ptr[i] != badResourceValue) { | |
527 report_heap_error(memblock, ptr+i, "in front of"); | |
528 } | |
529 } | |
530 u_char* end = (u_char*)memblock + size + space_after; | |
531 for (int j = -MallocCushion; j < 0; j++) { | |
532 if (end[j] != badResourceValue) { | |
533 report_heap_error(memblock, end+j, "after"); | |
534 } | |
535 } | |
536 } | |
537 } | |
538 #endif | |
539 | |
540 void* os::malloc(size_t size) { | |
541 NOT_PRODUCT(num_mallocs++); | |
542 NOT_PRODUCT(alloc_bytes += size); | |
543 | |
544 if (size == 0) { | |
545 // return a valid pointer if size is zero | |
546 // if NULL is returned the calling functions assume out of memory. | |
547 size = 1; | |
548 } | |
549 | |
550 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
551 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
552 #ifdef ASSERT | |
553 if (ptr == NULL) return NULL; | |
554 if (MallocCushion) { | |
555 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
556 u_char* end = ptr + space_before + size; | |
557 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
558 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
559 } | |
560 // put size just before data | |
561 *size_addr_from_base(ptr) = size; | |
562 #endif | |
563 u_char* memblock = ptr + space_before; | |
564 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
565 tty->print_cr("os::malloc caught, %lu bytes --> %p", size, memblock); | |
566 breakpoint(); | |
567 } | |
568 debug_only(if (paranoid) verify_block(memblock)); | |
569 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc %lu bytes --> %p", size, memblock); | |
570 return memblock; | |
571 } | |
572 | |
573 | |
574 void* os::realloc(void *memblock, size_t size) { | |
575 NOT_PRODUCT(num_mallocs++); | |
576 NOT_PRODUCT(alloc_bytes += size); | |
577 #ifndef ASSERT | |
578 return ::realloc(memblock, size); | |
579 #else | |
580 if (memblock == NULL) { | |
581 return os::malloc(size); | |
582 } | |
583 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
584 tty->print_cr("os::realloc caught %p", memblock); | |
585 breakpoint(); | |
586 } | |
587 verify_block(memblock); | |
588 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
589 if (size == 0) return NULL; | |
590 // always move the block | |
591 void* ptr = malloc(size); | |
592 if (PrintMalloc) tty->print_cr("os::remalloc %lu bytes, %p --> %p", size, memblock, ptr); | |
593 // Copy to new memory if malloc didn't fail | |
594 if ( ptr != NULL ) { | |
595 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
596 if (paranoid) verify_block(ptr); | |
597 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
598 tty->print_cr("os::realloc caught, %lu bytes --> %p", size, ptr); | |
599 breakpoint(); | |
600 } | |
601 free(memblock); | |
602 } | |
603 return ptr; | |
604 #endif | |
605 } | |
606 | |
607 | |
608 void os::free(void *memblock) { | |
609 NOT_PRODUCT(num_frees++); | |
610 #ifdef ASSERT | |
611 if (memblock == NULL) return; | |
612 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
613 if (tty != NULL) tty->print_cr("os::free caught %p", memblock); | |
614 breakpoint(); | |
615 } | |
616 verify_block(memblock); | |
617 if (PrintMalloc && tty != NULL) | |
618 // tty->print_cr("os::free %p", memblock); | |
619 fprintf(stderr, "os::free %p\n", memblock); | |
620 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
621 // Added by detlefs. | |
622 if (MallocCushion) { | |
623 u_char* ptr = (u_char*)memblock - space_before; | |
624 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
625 guarantee(*p == badResourceValue, | |
626 "Thing freed should be malloc result."); | |
627 *p = (u_char)freeBlockPad; | |
628 } | |
629 size_t size = get_size(memblock); | |
630 u_char* end = ptr + space_before + size; | |
631 for (u_char* q = end; q < end + MallocCushion; q++) { | |
632 guarantee(*q == badResourceValue, | |
633 "Thing freed should be malloc result."); | |
634 *q = (u_char)freeBlockPad; | |
635 } | |
636 } | |
637 #endif | |
638 ::free((char*)memblock - space_before); | |
639 } | |
640 | |
641 void os::init_random(long initval) { | |
642 _rand_seed = initval; | |
643 } | |
644 | |
645 | |
646 long os::random() { | |
647 /* standard, well-known linear congruential random generator with | |
648 * next_rand = (16807*seed) mod (2**31-1) | |
649 * see | |
650 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
651 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
652 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
653 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
654 */ | |
655 const long a = 16807; | |
656 const unsigned long m = 2147483647; | |
657 const long q = m / a; assert(q == 127773, "weird math"); | |
658 const long r = m % a; assert(r == 2836, "weird math"); | |
659 | |
660 // compute az=2^31p+q | |
661 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
662 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
663 lo += (hi & 0x7FFF) << 16; | |
664 | |
665 // if q overflowed, ignore the overflow and increment q | |
666 if (lo > m) { | |
667 lo &= m; | |
668 ++lo; | |
669 } | |
670 lo += hi >> 15; | |
671 | |
672 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
673 if (lo > m) { | |
674 lo &= m; | |
675 ++lo; | |
676 } | |
677 return (_rand_seed = lo); | |
678 } | |
679 | |
680 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
681 // conditions in which a thread is first started are different from those in which | |
682 // a suspension is resumed. These differences make it hard for us to apply the | |
683 // tougher checks when starting threads that we want to do when resuming them. | |
684 // However, when start_thread is called as a result of Thread.start, on a Java | |
685 // thread, the operation is synchronized on the Java Thread object. So there | |
686 // cannot be a race to start the thread and hence for the thread to exit while | |
687 // we are working on it. Non-Java threads that start Java threads either have | |
688 // to do so in a context in which races are impossible, or should do appropriate | |
689 // locking. | |
690 | |
691 void os::start_thread(Thread* thread) { | |
692 // guard suspend/resume | |
693 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
694 OSThread* osthread = thread->osthread(); | |
695 osthread->set_state(RUNNABLE); | |
696 pd_start_thread(thread); | |
697 } | |
698 | |
699 //--------------------------------------------------------------------------- | |
700 // Helper functions for fatal error handler | |
701 | |
702 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
703 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
704 | |
705 int cols = 0; | |
706 int cols_per_line = 0; | |
707 switch (unitsize) { | |
708 case 1: cols_per_line = 16; break; | |
709 case 2: cols_per_line = 8; break; | |
710 case 4: cols_per_line = 4; break; | |
711 case 8: cols_per_line = 2; break; | |
712 default: return; | |
713 } | |
714 | |
715 address p = start; | |
716 st->print(PTR_FORMAT ": ", start); | |
717 while (p < end) { | |
718 switch (unitsize) { | |
719 case 1: st->print("%02x", *(u1*)p); break; | |
720 case 2: st->print("%04x", *(u2*)p); break; | |
721 case 4: st->print("%08x", *(u4*)p); break; | |
722 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
723 } | |
724 p += unitsize; | |
725 cols++; | |
726 if (cols >= cols_per_line && p < end) { | |
727 cols = 0; | |
728 st->cr(); | |
729 st->print(PTR_FORMAT ": ", p); | |
730 } else { | |
731 st->print(" "); | |
732 } | |
733 } | |
734 st->cr(); | |
735 } | |
736 | |
737 void os::print_environment_variables(outputStream* st, const char** env_list, | |
738 char* buffer, int len) { | |
739 if (env_list) { | |
740 st->print_cr("Environment Variables:"); | |
741 | |
742 for (int i = 0; env_list[i] != NULL; i++) { | |
743 if (getenv(env_list[i], buffer, len)) { | |
744 st->print(env_list[i]); | |
745 st->print("="); | |
746 st->print_cr(buffer); | |
747 } | |
748 } | |
749 } | |
750 } | |
751 | |
752 void os::print_cpu_info(outputStream* st) { | |
753 // cpu | |
754 st->print("CPU:"); | |
755 st->print("total %d", os::processor_count()); | |
756 // It's not safe to query number of active processors after crash | |
757 // st->print("(active %d)", os::active_processor_count()); | |
758 st->print(" %s", VM_Version::cpu_features()); | |
759 st->cr(); | |
760 } | |
761 | |
762 void os::print_date_and_time(outputStream *st) { | |
763 time_t tloc; | |
764 (void)time(&tloc); | |
765 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
766 | |
767 double t = os::elapsedTime(); | |
768 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
769 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
770 // before printf. We lost some precision, but who cares? | |
771 st->print_cr("elapsed time: %d seconds", (int)t); | |
772 } | |
773 | |
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774 // moved from debug.cpp (used to be find()) but still called from there |
1907 | 775 // The verbose parameter is only set by the debug code in one case |
776 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
1681
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777 address addr = (address)x; |
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778 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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779 if (b != NULL) { |
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780 if (b->is_buffer_blob()) { |
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781 // the interpreter is generated into a buffer blob |
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782 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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783 if (i != NULL) { |
1907 | 784 st->print_cr(INTPTR_FORMAT " is an Interpreter codelet", addr); |
1681
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785 i->print_on(st); |
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786 return; |
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787 } |
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788 if (Interpreter::contains(addr)) { |
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789 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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790 " (not bytecode specific)", addr); |
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791 return; |
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792 } |
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793 // |
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794 if (AdapterHandlerLibrary::contains(b)) { |
1907 | 795 st->print_cr(INTPTR_FORMAT " is an AdapterHandler", addr); |
1681
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796 AdapterHandlerLibrary::print_handler_on(st, b); |
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797 } |
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798 // the stubroutines are generated into a buffer blob |
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799 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
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800 if (d != NULL) { |
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801 d->print_on(st); |
1907 | 802 if (verbose) st->cr(); |
1681
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803 return; |
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804 } |
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805 if (StubRoutines::contains(addr)) { |
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806 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
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807 "stub routine", addr); |
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808 return; |
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809 } |
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810 // the InlineCacheBuffer is using stubs generated into a buffer blob |
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811 if (InlineCacheBuffer::contains(addr)) { |
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812 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
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813 return; |
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814 } |
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815 VtableStub* v = VtableStubs::stub_containing(addr); |
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816 if (v != NULL) { |
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817 v->print_on(st); |
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818 return; |
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819 } |
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820 } |
1907 | 821 if (verbose && b->is_nmethod()) { |
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822 ResourceMark rm; |
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823 st->print("%#p: Compiled ", addr); |
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824 ((nmethod*)b)->method()->print_value_on(st); |
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825 st->print(" = (CodeBlob*)" INTPTR_FORMAT, b); |
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826 st->cr(); |
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827 return; |
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828 } |
1907 | 829 st->print(INTPTR_FORMAT " ", b); |
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830 if ( b->is_nmethod()) { |
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831 if (b->is_zombie()) { |
1907 | 832 st->print_cr("is zombie nmethod"); |
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833 } else if (b->is_not_entrant()) { |
1907 | 834 st->print_cr("is non-entrant nmethod"); |
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835 } |
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836 } |
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837 b->print_on(st); |
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838 return; |
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839 } |
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840 |
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841 if (Universe::heap()->is_in(addr)) { |
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842 HeapWord* p = Universe::heap()->block_start(addr); |
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843 bool print = false; |
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844 // If we couldn't find it it just may mean that heap wasn't parseable |
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845 // See if we were just given an oop directly |
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846 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
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847 print = true; |
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848 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
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849 p = (HeapWord*) addr; |
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850 print = true; |
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851 } |
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852 if (print) { |
1907 | 853 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
1681
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854 oop(p)->print_on(st); |
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855 if (p != (HeapWord*)x && oop(p)->is_constMethod() && |
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856 constMethodOop(p)->contains(addr)) { |
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857 Thread *thread = Thread::current(); |
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858 HandleMark hm(thread); |
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859 methodHandle mh (thread, constMethodOop(p)->method()); |
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860 if (!mh->is_native()) { |
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861 st->print_cr("bci_from(%p) = %d; print_codes():", |
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862 addr, mh->bci_from(address(x))); |
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863 mh->print_codes_on(st); |
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864 } |
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865 } |
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866 return; |
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867 } |
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868 } else { |
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869 if (Universe::heap()->is_in_reserved(addr)) { |
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870 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
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871 "in the heap", addr); |
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872 return; |
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|
873 } |
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874 } |
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875 if (JNIHandles::is_global_handle((jobject) addr)) { |
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876 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
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877 return; |
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878 } |
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879 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
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880 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
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881 return; |
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882 } |
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883 #ifndef PRODUCT |
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884 // we don't keep the block list in product mode |
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885 if (JNIHandleBlock::any_contains((jobject) addr)) { |
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886 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
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887 return; |
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|
888 } |
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889 #endif |
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|
890 |
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891 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
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892 // Check for privilege stack |
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893 if (thread->privileged_stack_top() != NULL && |
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894 thread->privileged_stack_top()->contains(addr)) { |
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895 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
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896 "for thread: " INTPTR_FORMAT, addr, thread); |
1907 | 897 if (verbose) thread->print_on(st); |
1681
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898 return; |
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|
899 } |
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900 // If the addr is a java thread print information about that. |
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901 if (addr == (address)thread) { |
1907 | 902 if (verbose) { |
903 thread->print_on(st); | |
904 } else { | |
905 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
906 } | |
1681
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907 return; |
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|
908 } |
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909 // If the addr is in the stack region for this thread then report that |
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910 // and print thread info |
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911 if (thread->stack_base() >= addr && |
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912 addr > (thread->stack_base() - thread->stack_size())) { |
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913 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
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914 INTPTR_FORMAT, addr, thread); |
1907 | 915 if (verbose) thread->print_on(st); |
1681
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916 return; |
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|
917 } |
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918 |
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|
919 } |
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920 // Try an OS specific find |
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921 if (os::find(addr, st)) { |
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922 return; |
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|
923 } |
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924 |
1907 | 925 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
1681
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926 } |
0 | 927 |
928 // Looks like all platforms except IA64 can use the same function to check | |
929 // if C stack is walkable beyond current frame. The check for fp() is not | |
930 // necessary on Sparc, but it's harmless. | |
931 bool os::is_first_C_frame(frame* fr) { | |
932 #ifdef IA64 | |
933 // In order to walk native frames on Itanium, we need to access the unwind | |
934 // table, which is inside ELF. We don't want to parse ELF after fatal error, | |
935 // so return true for IA64. If we need to support C stack walking on IA64, | |
936 // this function needs to be moved to CPU specific files, as fp() on IA64 | |
937 // is register stack, which grows towards higher memory address. | |
938 return true; | |
939 #endif | |
940 | |
941 // Load up sp, fp, sender sp and sender fp, check for reasonable values. | |
942 // Check usp first, because if that's bad the other accessors may fault | |
943 // on some architectures. Ditto ufp second, etc. | |
944 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
945 // sp on amd can be 32 bit aligned. | |
946 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
947 | |
948 uintptr_t usp = (uintptr_t)fr->sp(); | |
949 if ((usp & sp_align_mask) != 0) return true; | |
950 | |
951 uintptr_t ufp = (uintptr_t)fr->fp(); | |
952 if ((ufp & fp_align_mask) != 0) return true; | |
953 | |
954 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
955 if ((old_sp & sp_align_mask) != 0) return true; | |
956 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
957 | |
958 uintptr_t old_fp = (uintptr_t)fr->link(); | |
959 if ((old_fp & fp_align_mask) != 0) return true; | |
960 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
961 | |
962 // stack grows downwards; if old_fp is below current fp or if the stack | |
963 // frame is too large, either the stack is corrupted or fp is not saved | |
964 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
965 // is not walkable beyond current frame. | |
966 if (old_fp < ufp) return true; | |
967 if (old_fp - ufp > 64 * K) return true; | |
968 | |
969 return false; | |
970 } | |
971 | |
972 #ifdef ASSERT | |
973 extern "C" void test_random() { | |
974 const double m = 2147483647; | |
975 double mean = 0.0, variance = 0.0, t; | |
976 long reps = 10000; | |
977 unsigned long seed = 1; | |
978 | |
979 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
980 os::init_random(seed); | |
981 long num; | |
982 for (int k = 0; k < reps; k++) { | |
983 num = os::random(); | |
984 double u = (double)num / m; | |
985 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
986 | |
987 // calculate mean and variance of the random sequence | |
988 mean += u; | |
989 variance += (u*u); | |
990 } | |
991 mean /= reps; | |
992 variance /= (reps - 1); | |
993 | |
994 assert(num == 1043618065, "bad seed"); | |
995 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
996 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
997 const double eps = 0.0001; | |
998 t = fabsd(mean - 0.5018); | |
999 assert(t < eps, "bad mean"); | |
1000 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
1001 assert(t < eps, "bad variance"); | |
1002 } | |
1003 #endif | |
1004 | |
1005 | |
1006 // Set up the boot classpath. | |
1007 | |
1008 char* os::format_boot_path(const char* format_string, | |
1009 const char* home, | |
1010 int home_len, | |
1011 char fileSep, | |
1012 char pathSep) { | |
1013 assert((fileSep == '/' && pathSep == ':') || | |
1014 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
1015 | |
1016 // Scan the format string to determine the length of the actual | |
1017 // boot classpath, and handle platform dependencies as well. | |
1018 int formatted_path_len = 0; | |
1019 const char* p; | |
1020 for (p = format_string; *p != 0; ++p) { | |
1021 if (*p == '%') formatted_path_len += home_len - 1; | |
1022 ++formatted_path_len; | |
1023 } | |
1024 | |
1025 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1); | |
1026 if (formatted_path == NULL) { | |
1027 return NULL; | |
1028 } | |
1029 | |
1030 // Create boot classpath from format, substituting separator chars and | |
1031 // java home directory. | |
1032 char* q = formatted_path; | |
1033 for (p = format_string; *p != 0; ++p) { | |
1034 switch (*p) { | |
1035 case '%': | |
1036 strcpy(q, home); | |
1037 q += home_len; | |
1038 break; | |
1039 case '/': | |
1040 *q++ = fileSep; | |
1041 break; | |
1042 case ':': | |
1043 *q++ = pathSep; | |
1044 break; | |
1045 default: | |
1046 *q++ = *p; | |
1047 } | |
1048 } | |
1049 *q = '\0'; | |
1050 | |
1051 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
1052 return formatted_path; | |
1053 } | |
1054 | |
1055 | |
1056 bool os::set_boot_path(char fileSep, char pathSep) { | |
1057 const char* home = Arguments::get_java_home(); | |
1058 int home_len = (int)strlen(home); | |
1059 | |
1060 static const char* meta_index_dir_format = "%/lib/"; | |
1061 static const char* meta_index_format = "%/lib/meta-index"; | |
1062 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
1063 if (meta_index == NULL) return false; | |
1064 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
1065 if (meta_index_dir == NULL) return false; | |
1066 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
1067 | |
1068 // Any modification to the JAR-file list, for the boot classpath must be | |
1069 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
1070 // path class JARs, are stripped for StackMapTable to reduce download size. | |
1071 static const char classpath_format[] = | |
1072 "%/lib/resources.jar:" | |
1073 "%/lib/rt.jar:" | |
1074 "%/lib/sunrsasign.jar:" | |
1075 "%/lib/jsse.jar:" | |
1076 "%/lib/jce.jar:" | |
1077 "%/lib/charsets.jar:" | |
1642 | 1078 |
1079 // ## TEMPORARY hack to keep the legacy launcher working when | |
1080 // ## only the boot module is installed (cf. j.l.ClassLoader) | |
1081 "%/lib/modules/jdk.boot.jar:" | |
1082 | |
0 | 1083 "%/classes"; |
1084 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
1085 if (sysclasspath == NULL) return false; | |
1086 Arguments::set_sysclasspath(sysclasspath); | |
1087 | |
1088 return true; | |
1089 } | |
1090 | |
691 | 1091 /* |
1092 * Splits a path, based on its separator, the number of | |
1093 * elements is returned back in n. | |
1094 * It is the callers responsibility to: | |
1095 * a> check the value of n, and n may be 0. | |
1096 * b> ignore any empty path elements | |
1097 * c> free up the data. | |
1098 */ | |
1099 char** os::split_path(const char* path, int* n) { | |
1100 *n = 0; | |
1101 if (path == NULL || strlen(path) == 0) { | |
1102 return NULL; | |
1103 } | |
1104 const char psepchar = *os::path_separator(); | |
1105 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1); | |
1106 if (inpath == NULL) { | |
1107 return NULL; | |
1108 } | |
1109 strncpy(inpath, path, strlen(path)); | |
1110 int count = 1; | |
1111 char* p = strchr(inpath, psepchar); | |
1112 // Get a count of elements to allocate memory | |
1113 while (p != NULL) { | |
1114 count++; | |
1115 p++; | |
1116 p = strchr(p, psepchar); | |
1117 } | |
1118 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count); | |
1119 if (opath == NULL) { | |
1120 return NULL; | |
1121 } | |
1122 | |
1123 // do the actual splitting | |
1124 p = inpath; | |
1125 for (int i = 0 ; i < count ; i++) { | |
1126 size_t len = strcspn(p, os::path_separator()); | |
1127 if (len > JVM_MAXPATHLEN) { | |
1128 return NULL; | |
1129 } | |
1130 // allocate the string and add terminator storage | |
1131 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1); | |
1132 if (s == NULL) { | |
1133 return NULL; | |
1134 } | |
1135 strncpy(s, p, len); | |
1136 s[len] = '\0'; | |
1137 opath[i] = s; | |
1138 p += len + 1; | |
1139 } | |
1140 FREE_C_HEAP_ARRAY(char, inpath); | |
1141 *n = count; | |
1142 return opath; | |
1143 } | |
1144 | |
0 | 1145 void os::set_memory_serialize_page(address page) { |
1146 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
1147 _mem_serialize_page = (volatile int32_t *)page; | |
1148 // We initialize the serialization page shift count here | |
1149 // We assume a cache line size of 64 bytes | |
1150 assert(SerializePageShiftCount == count, | |
1151 "thread size changed, fix SerializePageShiftCount constant"); | |
1152 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
1153 } | |
1154 | |
55
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1155 static volatile intptr_t SerializePageLock = 0; |
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1156 |
0 | 1157 // This method is called from signal handler when SIGSEGV occurs while the current |
1158 // thread tries to store to the "read-only" memory serialize page during state | |
1159 // transition. | |
1160 void os::block_on_serialize_page_trap() { | |
1161 if (TraceSafepoint) { | |
1162 tty->print_cr("Block until the serialize page permission restored"); | |
1163 } | |
55
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1164 // When VMThread is holding the SerializePageLock during modifying the |
0 | 1165 // access permission of the memory serialize page, the following call |
1166 // will block until the permission of that page is restored to rw. | |
1167 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
1168 // this case, it's OK as the signal is synchronous and we know precisely when | |
55
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1169 // it can occur. |
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1170 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1171 Thread::muxRelease(&SerializePageLock); |
0 | 1172 } |
1173 | |
1174 // Serialize all thread state variables | |
1175 void os::serialize_thread_states() { | |
1176 // On some platforms such as Solaris & Linux, the time duration of the page | |
1177 // permission restoration is observed to be much longer than expected due to | |
1178 // scheduler starvation problem etc. To avoid the long synchronization | |
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1179 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1180 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1181 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1182 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1183 os::vm_page_size(), MEM_PROT_READ); |
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1184 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1185 os::vm_page_size(), MEM_PROT_RW); |
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1186 Thread::muxRelease(&SerializePageLock); |
0 | 1187 } |
1188 | |
1189 // Returns true if the current stack pointer is above the stack shadow | |
1190 // pages, false otherwise. | |
1191 | |
1192 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
1193 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
1194 address sp = current_stack_pointer(); | |
1195 // Check if we have StackShadowPages above the yellow zone. This parameter | |
605 | 1196 // is dependent on the depth of the maximum VM call stack possible from |
0 | 1197 // the handler for stack overflow. 'instanceof' in the stack overflow |
1198 // handler or a println uses at least 8k stack of VM and native code | |
1199 // respectively. | |
1200 const int framesize_in_bytes = | |
1201 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
1202 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
1203 * vm_page_size()) + framesize_in_bytes; | |
1204 // The very lower end of the stack | |
1205 address stack_limit = thread->stack_base() - thread->stack_size(); | |
1206 return (sp > (stack_limit + reserved_area)); | |
1207 } | |
1208 | |
1209 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
1210 uint min_pages) | |
1211 { | |
1212 assert(min_pages > 0, "sanity"); | |
1213 if (UseLargePages) { | |
1214 const size_t max_page_size = region_max_size / min_pages; | |
1215 | |
1216 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
1217 const size_t sz = _page_sizes[i]; | |
1218 const size_t mask = sz - 1; | |
1219 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
1220 // The largest page size with no fragmentation. | |
1221 return sz; | |
1222 } | |
1223 | |
1224 if (sz <= max_page_size) { | |
1225 // The largest page size that satisfies the min_pages requirement. | |
1226 return sz; | |
1227 } | |
1228 } | |
1229 } | |
1230 | |
1231 return vm_page_size(); | |
1232 } | |
1233 | |
1234 #ifndef PRODUCT | |
1235 void os::trace_page_sizes(const char* str, const size_t region_min_size, | |
1236 const size_t region_max_size, const size_t page_size, | |
1237 const char* base, const size_t size) | |
1238 { | |
1239 if (TracePageSizes) { | |
1240 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
1241 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
1242 " size=" SIZE_FORMAT, | |
1243 str, region_min_size, region_max_size, | |
1244 page_size, base, size); | |
1245 } | |
1246 } | |
1247 #endif // #ifndef PRODUCT | |
1248 | |
1249 // This is the working definition of a server class machine: | |
1250 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
1251 // because the graphics memory (?) sometimes masks physical memory. | |
1252 // If you want to change the definition of a server class machine | |
1253 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
1254 // then you'll have to parameterize this method based on that state, | |
1255 // as was done for logical processors here, or replicate and | |
1256 // specialize this method for each platform. (Or fix os to have | |
1257 // some inheritance structure and use subclassing. Sigh.) | |
1258 // If you want some platform to always or never behave as a server | |
1259 // class machine, change the setting of AlwaysActAsServerClassMachine | |
1260 // and NeverActAsServerClassMachine in globals*.hpp. | |
1261 bool os::is_server_class_machine() { | |
1262 // First check for the early returns | |
1263 if (NeverActAsServerClassMachine) { | |
1264 return false; | |
1265 } | |
1266 if (AlwaysActAsServerClassMachine) { | |
1267 return true; | |
1268 } | |
1269 // Then actually look at the machine | |
1270 bool result = false; | |
1271 const unsigned int server_processors = 2; | |
1272 const julong server_memory = 2UL * G; | |
1273 // We seem not to get our full complement of memory. | |
1274 // We allow some part (1/8?) of the memory to be "missing", | |
1275 // based on the sizes of DIMMs, and maybe graphics cards. | |
1276 const julong missing_memory = 256UL * M; | |
1277 | |
1278 /* Is this a server class machine? */ | |
1279 if ((os::active_processor_count() >= (int)server_processors) && | |
1280 (os::physical_memory() >= (server_memory - missing_memory))) { | |
1281 const unsigned int logical_processors = | |
1282 VM_Version::logical_processors_per_package(); | |
1283 if (logical_processors > 1) { | |
1284 const unsigned int physical_packages = | |
1285 os::active_processor_count() / logical_processors; | |
1286 if (physical_packages > server_processors) { | |
1287 result = true; | |
1288 } | |
1289 } else { | |
1290 result = true; | |
1291 } | |
1292 } | |
1293 return result; | |
1294 } |