Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/os.cpp @ 6231:7e5976e66c62
7182543: NMT ON: Aggregate a few NMT related bugs
Summary: 1) Fixed MemTrackWorker::generations_in_used() calculation 2) Ensured NMT not to leak memory recorders after shutdown 3) Used ThreadCritical to block safepoint safe threads
Reviewed-by: acorn, coleenp, dholmes, kvn
author | zgu |
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date | Thu, 19 Jul 2012 09:05:42 -0400 |
parents | d2a62e0f25eb |
children | 1d7922586cf6 |
rev | line source |
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0 | 1 /* |
2250 | 2 * Copyright (c) 1997, 2011, 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 * | |
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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" | |
6197 | 48 #include "services/memTracker.hpp" |
1972 | 49 #include "services/threadService.hpp" |
50 #include "utilities/defaultStream.hpp" | |
51 #include "utilities/events.hpp" | |
52 #ifdef TARGET_OS_FAMILY_linux | |
53 # include "os_linux.inline.hpp" | |
54 # include "thread_linux.inline.hpp" | |
55 #endif | |
56 #ifdef TARGET_OS_FAMILY_solaris | |
57 # include "os_solaris.inline.hpp" | |
58 # include "thread_solaris.inline.hpp" | |
59 #endif | |
60 #ifdef TARGET_OS_FAMILY_windows | |
61 # include "os_windows.inline.hpp" | |
62 # include "thread_windows.inline.hpp" | |
63 #endif | |
3960 | 64 #ifdef TARGET_OS_FAMILY_bsd |
65 # include "os_bsd.inline.hpp" | |
66 # include "thread_bsd.inline.hpp" | |
67 #endif | |
0 | 68 |
69 # include <signal.h> | |
70 | |
71 OSThread* os::_starting_thread = NULL; | |
72 address os::_polling_page = NULL; | |
73 volatile int32_t* os::_mem_serialize_page = NULL; | |
74 uintptr_t os::_serialize_page_mask = 0; | |
75 long os::_rand_seed = 1; | |
76 int os::_processor_count = 0; | |
77 size_t os::_page_sizes[os::page_sizes_max]; | |
78 | |
79 #ifndef PRODUCT | |
2250 | 80 julong os::num_mallocs = 0; // # of calls to malloc/realloc |
81 julong os::alloc_bytes = 0; // # of bytes allocated | |
82 julong os::num_frees = 0; // # of calls to free | |
83 julong os::free_bytes = 0; // # of bytes freed | |
0 | 84 #endif |
85 | |
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86 void os_init_globals() { |
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87 // Called from init_globals(). |
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88 // See Threads::create_vm() in thread.cpp, and init.cpp. |
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89 os::init_globals(); |
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90 } |
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91 |
0 | 92 // Fill in buffer with current local time as an ISO-8601 string. |
93 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
94 // Returns buffer, or NULL if it failed. | |
95 // This would mostly be a call to | |
96 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
97 // except that on Windows the %z behaves badly, so we do it ourselves. | |
98 // Also, people wanted milliseconds on there, | |
99 // and strftime doesn't do milliseconds. | |
100 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
101 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
102 // 1 2 | |
103 // 12345678901234567890123456789 | |
104 static const char* iso8601_format = | |
105 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
106 static const size_t needed_buffer = 29; | |
107 | |
108 // Sanity check the arguments | |
109 if (buffer == NULL) { | |
110 assert(false, "NULL buffer"); | |
111 return NULL; | |
112 } | |
113 if (buffer_length < needed_buffer) { | |
114 assert(false, "buffer_length too small"); | |
115 return NULL; | |
116 } | |
117 // Get the current time | |
61 | 118 jlong milliseconds_since_19700101 = javaTimeMillis(); |
0 | 119 const int milliseconds_per_microsecond = 1000; |
120 const time_t seconds_since_19700101 = | |
121 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
122 const int milliseconds_after_second = | |
123 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
124 // Convert the time value to a tm and timezone variable | |
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125 struct tm time_struct; |
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126 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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127 assert(false, "Failed localtime_pd"); |
0 | 128 return NULL; |
129 } | |
3960 | 130 #if defined(_ALLBSD_SOURCE) |
131 const time_t zone = (time_t) time_struct.tm_gmtoff; | |
132 #else | |
0 | 133 const time_t zone = timezone; |
3960 | 134 #endif |
0 | 135 |
136 // If daylight savings time is in effect, | |
137 // we are 1 hour East of our time zone | |
138 const time_t seconds_per_minute = 60; | |
139 const time_t minutes_per_hour = 60; | |
140 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
141 time_t UTC_to_local = zone; | |
142 if (time_struct.tm_isdst > 0) { | |
143 UTC_to_local = UTC_to_local - seconds_per_hour; | |
144 } | |
145 // Compute the time zone offset. | |
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146 // localtime_pd() sets timezone to the difference (in seconds) |
0 | 147 // between UTC and and local time. |
148 // ISO 8601 says we need the difference between local time and UTC, | |
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149 // we change the sign of the localtime_pd() result. |
0 | 150 const time_t local_to_UTC = -(UTC_to_local); |
151 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
152 char sign_local_to_UTC = '+'; | |
153 time_t abs_local_to_UTC = local_to_UTC; | |
154 if (local_to_UTC < 0) { | |
155 sign_local_to_UTC = '-'; | |
156 abs_local_to_UTC = -(abs_local_to_UTC); | |
157 } | |
158 // Convert time zone offset seconds to hours and minutes. | |
159 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
160 const time_t zone_min = | |
161 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
162 | |
163 // Print an ISO 8601 date and time stamp into the buffer | |
164 const int year = 1900 + time_struct.tm_year; | |
165 const int month = 1 + time_struct.tm_mon; | |
166 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
167 year, | |
168 month, | |
169 time_struct.tm_mday, | |
170 time_struct.tm_hour, | |
171 time_struct.tm_min, | |
172 time_struct.tm_sec, | |
173 milliseconds_after_second, | |
174 sign_local_to_UTC, | |
175 zone_hours, | |
176 zone_min); | |
177 if (printed == 0) { | |
178 assert(false, "Failed jio_printf"); | |
179 return NULL; | |
180 } | |
181 return buffer; | |
182 } | |
183 | |
184 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
185 #ifdef ASSERT | |
186 if (!(!thread->is_Java_thread() || | |
187 Thread::current() == thread || | |
188 Threads_lock->owned_by_self() | |
189 || thread->is_Compiler_thread() | |
190 )) { | |
191 assert(false, "possibility of dangling Thread pointer"); | |
192 } | |
193 #endif | |
194 | |
195 if (p >= MinPriority && p <= MaxPriority) { | |
196 int priority = java_to_os_priority[p]; | |
197 return set_native_priority(thread, priority); | |
198 } else { | |
199 assert(false, "Should not happen"); | |
200 return OS_ERR; | |
201 } | |
202 } | |
203 | |
204 | |
205 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { | |
206 int p; | |
207 int os_prio; | |
208 OSReturn ret = get_native_priority(thread, &os_prio); | |
209 if (ret != OS_OK) return ret; | |
210 | |
211 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
212 priority = (ThreadPriority)p; | |
213 return OS_OK; | |
214 } | |
215 | |
216 | |
217 // --------------------- sun.misc.Signal (optional) --------------------- | |
218 | |
219 | |
220 // SIGBREAK is sent by the keyboard to query the VM state | |
221 #ifndef SIGBREAK | |
222 #define SIGBREAK SIGQUIT | |
223 #endif | |
224 | |
225 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
226 | |
227 | |
228 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
229 os::set_priority(thread, NearMaxPriority); | |
230 while (true) { | |
231 int sig; | |
232 { | |
233 // FIXME : Currently we have not decieded what should be the status | |
234 // for this java thread blocked here. Once we decide about | |
235 // that we should fix this. | |
236 sig = os::signal_wait(); | |
237 } | |
238 if (sig == os::sigexitnum_pd()) { | |
239 // Terminate the signal thread | |
240 return; | |
241 } | |
242 | |
243 switch (sig) { | |
244 case SIGBREAK: { | |
245 // Check if the signal is a trigger to start the Attach Listener - in that | |
246 // case don't print stack traces. | |
247 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
248 continue; | |
249 } | |
250 // Print stack traces | |
251 // Any SIGBREAK operations added here should make sure to flush | |
252 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
253 // Each module also prints an extra carriage return after its output. | |
254 VM_PrintThreads op; | |
255 VMThread::execute(&op); | |
256 VM_PrintJNI jni_op; | |
257 VMThread::execute(&jni_op); | |
258 VM_FindDeadlocks op1(tty); | |
259 VMThread::execute(&op1); | |
260 Universe::print_heap_at_SIGBREAK(); | |
261 if (PrintClassHistogram) { | |
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262 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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263 true /* need_prologue */); |
0 | 264 VMThread::execute(&op1); |
265 } | |
266 if (JvmtiExport::should_post_data_dump()) { | |
267 JvmtiExport::post_data_dump(); | |
268 } | |
269 break; | |
270 } | |
271 default: { | |
272 // Dispatch the signal to java | |
273 HandleMark hm(THREAD); | |
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274 klassOop k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
0 | 275 KlassHandle klass (THREAD, k); |
276 if (klass.not_null()) { | |
277 JavaValue result(T_VOID); | |
278 JavaCallArguments args; | |
279 args.push_int(sig); | |
280 JavaCalls::call_static( | |
281 &result, | |
282 klass, | |
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283 vmSymbols::dispatch_name(), |
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284 vmSymbols::int_void_signature(), |
0 | 285 &args, |
286 THREAD | |
287 ); | |
288 } | |
289 if (HAS_PENDING_EXCEPTION) { | |
290 // tty is initialized early so we don't expect it to be null, but | |
291 // if it is we can't risk doing an initialization that might | |
292 // trigger additional out-of-memory conditions | |
293 if (tty != NULL) { | |
294 char klass_name[256]; | |
295 char tmp_sig_name[16]; | |
296 const char* sig_name = "UNKNOWN"; | |
297 instanceKlass::cast(PENDING_EXCEPTION->klass())-> | |
298 name()->as_klass_external_name(klass_name, 256); | |
299 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
300 sig_name = tmp_sig_name; | |
301 warning("Exception %s occurred dispatching signal %s to handler" | |
302 "- the VM may need to be forcibly terminated", | |
303 klass_name, sig_name ); | |
304 } | |
305 CLEAR_PENDING_EXCEPTION; | |
306 } | |
307 } | |
308 } | |
309 } | |
310 } | |
311 | |
312 | |
313 void os::signal_init() { | |
314 if (!ReduceSignalUsage) { | |
315 // Setup JavaThread for processing signals | |
316 EXCEPTION_MARK; | |
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317 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 318 instanceKlassHandle klass (THREAD, k); |
319 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
320 | |
321 const char thread_name[] = "Signal Dispatcher"; | |
322 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
323 | |
324 // Initialize thread_oop to put it into the system threadGroup | |
325 Handle thread_group (THREAD, Universe::system_thread_group()); | |
326 JavaValue result(T_VOID); | |
327 JavaCalls::call_special(&result, thread_oop, | |
328 klass, | |
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329 vmSymbols::object_initializer_name(), |
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330 vmSymbols::threadgroup_string_void_signature(), |
0 | 331 thread_group, |
332 string, | |
333 CHECK); | |
334 | |
1142 | 335 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 336 JavaCalls::call_special(&result, |
337 thread_group, | |
338 group, | |
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339 vmSymbols::add_method_name(), |
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340 vmSymbols::thread_void_signature(), |
0 | 341 thread_oop, // ARG 1 |
342 CHECK); | |
343 | |
344 os::signal_init_pd(); | |
345 | |
346 { MutexLocker mu(Threads_lock); | |
347 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
348 | |
349 // At this point it may be possible that no osthread was created for the | |
350 // JavaThread due to lack of memory. We would have to throw an exception | |
351 // in that case. However, since this must work and we do not allow | |
352 // exceptions anyway, check and abort if this fails. | |
353 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
354 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
355 "unable to create new native thread"); | |
356 } | |
357 | |
358 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
359 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
360 java_lang_Thread::set_daemon(thread_oop()); | |
361 | |
362 signal_thread->set_threadObj(thread_oop()); | |
363 Threads::add(signal_thread); | |
364 Thread::start(signal_thread); | |
365 } | |
366 // Handle ^BREAK | |
367 os::signal(SIGBREAK, os::user_handler()); | |
368 } | |
369 } | |
370 | |
371 | |
372 void os::terminate_signal_thread() { | |
373 if (!ReduceSignalUsage) | |
374 signal_notify(sigexitnum_pd()); | |
375 } | |
376 | |
377 | |
378 // --------------------- loading libraries --------------------- | |
379 | |
380 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
381 extern struct JavaVM_ main_vm; | |
382 | |
383 static void* _native_java_library = NULL; | |
384 | |
385 void* os::native_java_library() { | |
386 if (_native_java_library == NULL) { | |
387 char buffer[JVM_MAXPATHLEN]; | |
388 char ebuf[1024]; | |
389 | |
242 | 390 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
391 // always able to find it when the loading executable is outside the JDK. | |
0 | 392 // In order to keep working with 1.2 we ignore any loading errors. |
242 | 393 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"); |
394 dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 395 |
396 // Load java dll | |
242 | 397 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java"); |
398 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); | |
0 | 399 if (_native_java_library == NULL) { |
400 vm_exit_during_initialization("Unable to load native library", ebuf); | |
401 } | |
3960 | 402 |
403 #if defined(__OpenBSD__) | |
404 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so | |
405 // ignore errors | |
406 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "net"); | |
407 dll_load(buffer, ebuf, sizeof(ebuf)); | |
408 #endif | |
242 | 409 } |
410 static jboolean onLoaded = JNI_FALSE; | |
411 if (onLoaded) { | |
412 // We may have to wait to fire OnLoad until TLS is initialized. | |
413 if (ThreadLocalStorage::is_initialized()) { | |
414 // The JNI_OnLoad handling is normally done by method load in | |
415 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
416 // explicitly so we have to check for JNI_OnLoad as well | |
417 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
418 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
419 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
420 if (JNI_OnLoad != NULL) { | |
421 JavaThread* thread = JavaThread::current(); | |
422 ThreadToNativeFromVM ttn(thread); | |
423 HandleMark hm(thread); | |
424 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
425 onLoaded = JNI_TRUE; | |
426 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
427 vm_exit_during_initialization("Unsupported JNI version"); | |
428 } | |
0 | 429 } |
430 } | |
431 } | |
432 return _native_java_library; | |
433 } | |
434 | |
435 // --------------------- heap allocation utilities --------------------- | |
436 | |
6197 | 437 char *os::strdup(const char *str, MEMFLAGS flags) { |
0 | 438 size_t size = strlen(str); |
6197 | 439 char *dup_str = (char *)malloc(size + 1, flags); |
0 | 440 if (dup_str == NULL) return NULL; |
441 strcpy(dup_str, str); | |
442 return dup_str; | |
443 } | |
444 | |
445 | |
446 | |
447 #ifdef ASSERT | |
448 #define space_before (MallocCushion + sizeof(double)) | |
449 #define space_after MallocCushion | |
450 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
451 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
452 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
453 // NB: cannot be debug variable, because these aren't set from the command line until | |
454 // *after* the first few allocs already happened | |
455 #define MallocCushion 16 | |
456 #else | |
457 #define space_before 0 | |
458 #define space_after 0 | |
459 #define size_addr_from_base(p) should not use w/o ASSERT | |
460 #define size_addr_from_obj(p) should not use w/o ASSERT | |
461 #define MallocCushion 0 | |
462 #endif | |
463 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
464 | |
465 #ifdef ASSERT | |
466 inline size_t get_size(void* obj) { | |
467 size_t size = *size_addr_from_obj(obj); | |
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468 if (size < 0) { |
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469 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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470 SIZE_FORMAT ")", obj, size)); |
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471 } |
0 | 472 return size; |
473 } | |
474 | |
475 u_char* find_cushion_backwards(u_char* start) { | |
476 u_char* p = start; | |
477 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
478 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
479 // ok, we have four consecutive marker bytes; find start | |
480 u_char* q = p - 4; | |
481 while (*q == badResourceValue) q--; | |
482 return q + 1; | |
483 } | |
484 | |
485 u_char* find_cushion_forwards(u_char* start) { | |
486 u_char* p = start; | |
487 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
488 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
489 // ok, we have four consecutive marker bytes; find end of cushion | |
490 u_char* q = p + 4; | |
491 while (*q == badResourceValue) q++; | |
492 return q - MallocCushion; | |
493 } | |
494 | |
495 void print_neighbor_blocks(void* ptr) { | |
496 // find block allocated before ptr (not entirely crash-proof) | |
497 if (MallocCushion < 4) { | |
498 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
499 return; | |
500 } | |
501 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
502 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
503 // look for cushion in front of prev. block | |
504 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
505 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
506 u_char* obj = start_of_prev_block + space_before; | |
507 if (size <= 0 ) { | |
508 // start is bad; mayhave been confused by OS data inbetween objects | |
509 // search one more backwards | |
510 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
511 size = *size_addr_from_base(start_of_prev_block); | |
512 obj = start_of_prev_block + space_before; | |
513 } | |
514 | |
515 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
2250 | 516 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 517 } else { |
2250 | 518 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 519 } |
520 | |
521 // now find successor block | |
522 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
523 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
524 u_char* next_obj = start_of_next_block + space_before; | |
525 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
526 if (start_of_next_block[0] == badResourceValue && | |
527 start_of_next_block[1] == badResourceValue && | |
528 start_of_next_block[2] == badResourceValue && | |
529 start_of_next_block[3] == badResourceValue) { | |
2250 | 530 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 531 } else { |
2250 | 532 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 533 } |
534 } | |
535 | |
536 | |
537 void report_heap_error(void* memblock, void* bad, const char* where) { | |
2250 | 538 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
539 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
0 | 540 print_neighbor_blocks(memblock); |
541 fatal("memory stomping error"); | |
542 } | |
543 | |
544 void verify_block(void* memblock) { | |
545 size_t size = get_size(memblock); | |
546 if (MallocCushion) { | |
547 u_char* ptr = (u_char*)memblock - space_before; | |
548 for (int i = 0; i < MallocCushion; i++) { | |
549 if (ptr[i] != badResourceValue) { | |
550 report_heap_error(memblock, ptr+i, "in front of"); | |
551 } | |
552 } | |
553 u_char* end = (u_char*)memblock + size + space_after; | |
554 for (int j = -MallocCushion; j < 0; j++) { | |
555 if (end[j] != badResourceValue) { | |
556 report_heap_error(memblock, end+j, "after"); | |
557 } | |
558 } | |
559 } | |
560 } | |
561 #endif | |
562 | |
6197 | 563 void* os::malloc(size_t size, MEMFLAGS memflags, address caller) { |
2250 | 564 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
565 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
0 | 566 |
567 if (size == 0) { | |
568 // return a valid pointer if size is zero | |
569 // if NULL is returned the calling functions assume out of memory. | |
570 size = 1; | |
571 } | |
572 | |
573 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
574 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
6197 | 575 |
0 | 576 #ifdef ASSERT |
577 if (ptr == NULL) return NULL; | |
578 if (MallocCushion) { | |
579 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
580 u_char* end = ptr + space_before + size; | |
581 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
582 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
583 } | |
584 // put size just before data | |
585 *size_addr_from_base(ptr) = size; | |
586 #endif | |
587 u_char* memblock = ptr + space_before; | |
588 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 589 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
0 | 590 breakpoint(); |
591 } | |
592 debug_only(if (paranoid) verify_block(memblock)); | |
2250 | 593 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
6197 | 594 |
595 // we do not track MallocCushion memory | |
596 if (MemTracker::is_on()) { | |
597 MemTracker::record_malloc((address)memblock, size, memflags, caller == 0 ? CALLER_PC : caller); | |
598 } | |
599 | |
0 | 600 return memblock; |
601 } | |
602 | |
603 | |
6197 | 604 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, address caller) { |
0 | 605 #ifndef ASSERT |
2250 | 606 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
607 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
6197 | 608 void* ptr = ::realloc(memblock, size); |
609 if (ptr != NULL && MemTracker::is_on()) { | |
610 MemTracker::record_realloc((address)memblock, (address)ptr, size, memflags, | |
611 caller == 0 ? CALLER_PC : caller); | |
612 } | |
613 return ptr; | |
0 | 614 #else |
615 if (memblock == NULL) { | |
6197 | 616 return malloc(size, memflags, (caller == 0 ? CALLER_PC : caller)); |
0 | 617 } |
618 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 619 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
0 | 620 breakpoint(); |
621 } | |
622 verify_block(memblock); | |
623 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
624 if (size == 0) return NULL; | |
625 // always move the block | |
6197 | 626 void* ptr = malloc(size, memflags, caller == 0 ? CALLER_PC : caller); |
2250 | 627 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
0 | 628 // Copy to new memory if malloc didn't fail |
629 if ( ptr != NULL ) { | |
630 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
631 if (paranoid) verify_block(ptr); | |
632 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
2250 | 633 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
0 | 634 breakpoint(); |
635 } | |
636 free(memblock); | |
637 } | |
638 return ptr; | |
639 #endif | |
640 } | |
641 | |
642 | |
6197 | 643 void os::free(void *memblock, MEMFLAGS memflags) { |
2250 | 644 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
0 | 645 #ifdef ASSERT |
646 if (memblock == NULL) return; | |
647 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 648 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
0 | 649 breakpoint(); |
650 } | |
651 verify_block(memblock); | |
652 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
653 // Added by detlefs. | |
654 if (MallocCushion) { | |
655 u_char* ptr = (u_char*)memblock - space_before; | |
656 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
657 guarantee(*p == badResourceValue, | |
658 "Thing freed should be malloc result."); | |
659 *p = (u_char)freeBlockPad; | |
660 } | |
661 size_t size = get_size(memblock); | |
2250 | 662 inc_stat_counter(&free_bytes, size); |
0 | 663 u_char* end = ptr + space_before + size; |
664 for (u_char* q = end; q < end + MallocCushion; q++) { | |
665 guarantee(*q == badResourceValue, | |
666 "Thing freed should be malloc result."); | |
667 *q = (u_char)freeBlockPad; | |
668 } | |
2250 | 669 if (PrintMalloc && tty != NULL) |
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670 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
2250 | 671 } else if (PrintMalloc && tty != NULL) { |
672 // tty->print_cr("os::free %p", memblock); | |
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673 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
0 | 674 } |
675 #endif | |
6197 | 676 MemTracker::record_free((address)memblock, memflags); |
677 | |
0 | 678 ::free((char*)memblock - space_before); |
679 } | |
680 | |
681 void os::init_random(long initval) { | |
682 _rand_seed = initval; | |
683 } | |
684 | |
685 | |
686 long os::random() { | |
687 /* standard, well-known linear congruential random generator with | |
688 * next_rand = (16807*seed) mod (2**31-1) | |
689 * see | |
690 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
691 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
692 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
693 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
694 */ | |
695 const long a = 16807; | |
696 const unsigned long m = 2147483647; | |
697 const long q = m / a; assert(q == 127773, "weird math"); | |
698 const long r = m % a; assert(r == 2836, "weird math"); | |
699 | |
700 // compute az=2^31p+q | |
701 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
702 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
703 lo += (hi & 0x7FFF) << 16; | |
704 | |
705 // if q overflowed, ignore the overflow and increment q | |
706 if (lo > m) { | |
707 lo &= m; | |
708 ++lo; | |
709 } | |
710 lo += hi >> 15; | |
711 | |
712 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
713 if (lo > m) { | |
714 lo &= m; | |
715 ++lo; | |
716 } | |
717 return (_rand_seed = lo); | |
718 } | |
719 | |
720 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
721 // conditions in which a thread is first started are different from those in which | |
722 // a suspension is resumed. These differences make it hard for us to apply the | |
723 // tougher checks when starting threads that we want to do when resuming them. | |
724 // However, when start_thread is called as a result of Thread.start, on a Java | |
725 // thread, the operation is synchronized on the Java Thread object. So there | |
726 // cannot be a race to start the thread and hence for the thread to exit while | |
727 // we are working on it. Non-Java threads that start Java threads either have | |
728 // to do so in a context in which races are impossible, or should do appropriate | |
729 // locking. | |
730 | |
731 void os::start_thread(Thread* thread) { | |
732 // guard suspend/resume | |
733 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
734 OSThread* osthread = thread->osthread(); | |
735 osthread->set_state(RUNNABLE); | |
736 pd_start_thread(thread); | |
737 } | |
738 | |
739 //--------------------------------------------------------------------------- | |
740 // Helper functions for fatal error handler | |
741 | |
742 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
743 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
744 | |
745 int cols = 0; | |
746 int cols_per_line = 0; | |
747 switch (unitsize) { | |
748 case 1: cols_per_line = 16; break; | |
749 case 2: cols_per_line = 8; break; | |
750 case 4: cols_per_line = 4; break; | |
751 case 8: cols_per_line = 2; break; | |
752 default: return; | |
753 } | |
754 | |
755 address p = start; | |
756 st->print(PTR_FORMAT ": ", start); | |
757 while (p < end) { | |
758 switch (unitsize) { | |
759 case 1: st->print("%02x", *(u1*)p); break; | |
760 case 2: st->print("%04x", *(u2*)p); break; | |
761 case 4: st->print("%08x", *(u4*)p); break; | |
762 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
763 } | |
764 p += unitsize; | |
765 cols++; | |
766 if (cols >= cols_per_line && p < end) { | |
767 cols = 0; | |
768 st->cr(); | |
769 st->print(PTR_FORMAT ": ", p); | |
770 } else { | |
771 st->print(" "); | |
772 } | |
773 } | |
774 st->cr(); | |
775 } | |
776 | |
777 void os::print_environment_variables(outputStream* st, const char** env_list, | |
778 char* buffer, int len) { | |
779 if (env_list) { | |
780 st->print_cr("Environment Variables:"); | |
781 | |
782 for (int i = 0; env_list[i] != NULL; i++) { | |
783 if (getenv(env_list[i], buffer, len)) { | |
784 st->print(env_list[i]); | |
785 st->print("="); | |
786 st->print_cr(buffer); | |
787 } | |
788 } | |
789 } | |
790 } | |
791 | |
792 void os::print_cpu_info(outputStream* st) { | |
793 // cpu | |
794 st->print("CPU:"); | |
795 st->print("total %d", os::processor_count()); | |
796 // It's not safe to query number of active processors after crash | |
797 // st->print("(active %d)", os::active_processor_count()); | |
798 st->print(" %s", VM_Version::cpu_features()); | |
799 st->cr(); | |
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800 pd_print_cpu_info(st); |
0 | 801 } |
802 | |
803 void os::print_date_and_time(outputStream *st) { | |
804 time_t tloc; | |
805 (void)time(&tloc); | |
806 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
807 | |
808 double t = os::elapsedTime(); | |
809 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
810 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
811 // before printf. We lost some precision, but who cares? | |
812 st->print_cr("elapsed time: %d seconds", (int)t); | |
813 } | |
814 | |
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815 // moved from debug.cpp (used to be find()) but still called from there |
1907 | 816 // The verbose parameter is only set by the debug code in one case |
817 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
1681
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818 address addr = (address)x; |
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819 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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820 if (b != NULL) { |
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821 if (b->is_buffer_blob()) { |
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822 // the interpreter is generated into a buffer blob |
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823 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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824 if (i != NULL) { |
1907 | 825 st->print_cr(INTPTR_FORMAT " is an Interpreter codelet", addr); |
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826 i->print_on(st); |
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827 return; |
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828 } |
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829 if (Interpreter::contains(addr)) { |
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830 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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831 " (not bytecode specific)", addr); |
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832 return; |
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833 } |
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834 // |
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835 if (AdapterHandlerLibrary::contains(b)) { |
1907 | 836 st->print_cr(INTPTR_FORMAT " is an AdapterHandler", addr); |
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837 AdapterHandlerLibrary::print_handler_on(st, b); |
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838 } |
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839 // the stubroutines are generated into a buffer blob |
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840 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
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841 if (d != NULL) { |
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842 d->print_on(st); |
1907 | 843 if (verbose) st->cr(); |
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844 return; |
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845 } |
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846 if (StubRoutines::contains(addr)) { |
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847 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
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848 "stub routine", addr); |
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849 return; |
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850 } |
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851 // the InlineCacheBuffer is using stubs generated into a buffer blob |
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852 if (InlineCacheBuffer::contains(addr)) { |
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853 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
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854 return; |
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|
855 } |
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856 VtableStub* v = VtableStubs::stub_containing(addr); |
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857 if (v != NULL) { |
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|
858 v->print_on(st); |
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|
859 return; |
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|
860 } |
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|
861 } |
1907 | 862 if (verbose && b->is_nmethod()) { |
1681
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|
863 ResourceMark rm; |
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|
864 st->print("%#p: Compiled ", addr); |
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|
865 ((nmethod*)b)->method()->print_value_on(st); |
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866 st->print(" = (CodeBlob*)" INTPTR_FORMAT, b); |
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|
867 st->cr(); |
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|
868 return; |
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|
869 } |
1907 | 870 st->print(INTPTR_FORMAT " ", b); |
1681
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|
871 if ( b->is_nmethod()) { |
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|
872 if (b->is_zombie()) { |
1907 | 873 st->print_cr("is zombie nmethod"); |
1681
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874 } else if (b->is_not_entrant()) { |
1907 | 875 st->print_cr("is non-entrant nmethod"); |
1681
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|
876 } |
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|
877 } |
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|
878 b->print_on(st); |
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|
879 return; |
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|
880 } |
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|
881 |
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diff
changeset
|
882 if (Universe::heap()->is_in(addr)) { |
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|
883 HeapWord* p = Universe::heap()->block_start(addr); |
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|
884 bool print = false; |
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|
885 // If we couldn't find it it just may mean that heap wasn't parseable |
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|
886 // See if we were just given an oop directly |
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|
887 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
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|
888 print = true; |
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|
889 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
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|
890 p = (HeapWord*) addr; |
126ea7725993
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diff
changeset
|
891 print = true; |
126ea7725993
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diff
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|
892 } |
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|
893 if (print) { |
1907 | 894 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
1681
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|
895 oop(p)->print_on(st); |
126ea7725993
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|
896 if (p != (HeapWord*)x && oop(p)->is_constMethod() && |
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|
897 constMethodOop(p)->contains(addr)) { |
126ea7725993
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diff
changeset
|
898 Thread *thread = Thread::current(); |
126ea7725993
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diff
changeset
|
899 HandleMark hm(thread); |
126ea7725993
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diff
changeset
|
900 methodHandle mh (thread, constMethodOop(p)->method()); |
126ea7725993
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diff
changeset
|
901 if (!mh->is_native()) { |
126ea7725993
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diff
changeset
|
902 st->print_cr("bci_from(%p) = %d; print_codes():", |
126ea7725993
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changeset
|
903 addr, mh->bci_from(address(x))); |
126ea7725993
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changeset
|
904 mh->print_codes_on(st); |
126ea7725993
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parents:
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diff
changeset
|
905 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
906 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
907 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
908 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
909 } else { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
910 if (Universe::heap()->is_in_reserved(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
911 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
126ea7725993
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diff
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|
912 "in the heap", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
913 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
914 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
915 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
916 if (JNIHandles::is_global_handle((jobject) addr)) { |
126ea7725993
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diff
changeset
|
917 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
918 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
919 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
920 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
126ea7725993
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|
921 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
922 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
923 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
924 #ifndef PRODUCT |
126ea7725993
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bobv
parents:
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diff
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|
925 // we don't keep the block list in product mode |
126ea7725993
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diff
changeset
|
926 if (JNIHandleBlock::any_contains((jobject) addr)) { |
126ea7725993
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|
927 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
928 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
929 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
930 #endif |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
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|
931 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
932 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
933 // Check for privilege stack |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
934 if (thread->privileged_stack_top() != NULL && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
935 thread->privileged_stack_top()->contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
936 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
126ea7725993
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bobv
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diff
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|
937 "for thread: " INTPTR_FORMAT, addr, thread); |
1907 | 938 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
939 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
940 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
941 // If the addr is a java thread print information about that. |
126ea7725993
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diff
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|
942 if (addr == (address)thread) { |
1907 | 943 if (verbose) { |
944 thread->print_on(st); | |
945 } else { | |
946 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
947 } | |
1681
126ea7725993
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bobv
parents:
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diff
changeset
|
948 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
949 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
950 // If the addr is in the stack region for this thread then report that |
126ea7725993
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bobv
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diff
changeset
|
951 // and print thread info |
126ea7725993
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diff
changeset
|
952 if (thread->stack_base() >= addr && |
126ea7725993
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changeset
|
953 addr > (thread->stack_base() - thread->stack_size())) { |
126ea7725993
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|
954 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
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|
955 INTPTR_FORMAT, addr, thread); |
1907 | 956 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
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|
957 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
958 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
959 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
960 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
961 // Try an OS specific find |
126ea7725993
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diff
changeset
|
962 if (os::find(addr, st)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
963 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
964 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
965 |
1907 | 966 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
1681
126ea7725993
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|
967 } |
0 | 968 |
969 // Looks like all platforms except IA64 can use the same function to check | |
970 // if C stack is walkable beyond current frame. The check for fp() is not | |
971 // necessary on Sparc, but it's harmless. | |
972 bool os::is_first_C_frame(frame* fr) { | |
973 #ifdef IA64 | |
974 // In order to walk native frames on Itanium, we need to access the unwind | |
975 // table, which is inside ELF. We don't want to parse ELF after fatal error, | |
976 // so return true for IA64. If we need to support C stack walking on IA64, | |
977 // this function needs to be moved to CPU specific files, as fp() on IA64 | |
978 // is register stack, which grows towards higher memory address. | |
979 return true; | |
980 #endif | |
981 | |
982 // Load up sp, fp, sender sp and sender fp, check for reasonable values. | |
983 // Check usp first, because if that's bad the other accessors may fault | |
984 // on some architectures. Ditto ufp second, etc. | |
985 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
986 // sp on amd can be 32 bit aligned. | |
987 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
988 | |
989 uintptr_t usp = (uintptr_t)fr->sp(); | |
990 if ((usp & sp_align_mask) != 0) return true; | |
991 | |
992 uintptr_t ufp = (uintptr_t)fr->fp(); | |
993 if ((ufp & fp_align_mask) != 0) return true; | |
994 | |
995 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
996 if ((old_sp & sp_align_mask) != 0) return true; | |
997 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
998 | |
999 uintptr_t old_fp = (uintptr_t)fr->link(); | |
1000 if ((old_fp & fp_align_mask) != 0) return true; | |
1001 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
1002 | |
1003 // stack grows downwards; if old_fp is below current fp or if the stack | |
1004 // frame is too large, either the stack is corrupted or fp is not saved | |
1005 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
1006 // is not walkable beyond current frame. | |
1007 if (old_fp < ufp) return true; | |
1008 if (old_fp - ufp > 64 * K) return true; | |
1009 | |
1010 return false; | |
1011 } | |
1012 | |
1013 #ifdef ASSERT | |
1014 extern "C" void test_random() { | |
1015 const double m = 2147483647; | |
1016 double mean = 0.0, variance = 0.0, t; | |
1017 long reps = 10000; | |
1018 unsigned long seed = 1; | |
1019 | |
1020 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
1021 os::init_random(seed); | |
1022 long num; | |
1023 for (int k = 0; k < reps; k++) { | |
1024 num = os::random(); | |
1025 double u = (double)num / m; | |
1026 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
1027 | |
1028 // calculate mean and variance of the random sequence | |
1029 mean += u; | |
1030 variance += (u*u); | |
1031 } | |
1032 mean /= reps; | |
1033 variance /= (reps - 1); | |
1034 | |
1035 assert(num == 1043618065, "bad seed"); | |
1036 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
1037 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
1038 const double eps = 0.0001; | |
1039 t = fabsd(mean - 0.5018); | |
1040 assert(t < eps, "bad mean"); | |
1041 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
1042 assert(t < eps, "bad variance"); | |
1043 } | |
1044 #endif | |
1045 | |
1046 | |
1047 // Set up the boot classpath. | |
1048 | |
1049 char* os::format_boot_path(const char* format_string, | |
1050 const char* home, | |
1051 int home_len, | |
1052 char fileSep, | |
1053 char pathSep) { | |
1054 assert((fileSep == '/' && pathSep == ':') || | |
1055 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
1056 | |
1057 // Scan the format string to determine the length of the actual | |
1058 // boot classpath, and handle platform dependencies as well. | |
1059 int formatted_path_len = 0; | |
1060 const char* p; | |
1061 for (p = format_string; *p != 0; ++p) { | |
1062 if (*p == '%') formatted_path_len += home_len - 1; | |
1063 ++formatted_path_len; | |
1064 } | |
1065 | |
6197 | 1066 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); |
0 | 1067 if (formatted_path == NULL) { |
1068 return NULL; | |
1069 } | |
1070 | |
1071 // Create boot classpath from format, substituting separator chars and | |
1072 // java home directory. | |
1073 char* q = formatted_path; | |
1074 for (p = format_string; *p != 0; ++p) { | |
1075 switch (*p) { | |
1076 case '%': | |
1077 strcpy(q, home); | |
1078 q += home_len; | |
1079 break; | |
1080 case '/': | |
1081 *q++ = fileSep; | |
1082 break; | |
1083 case ':': | |
1084 *q++ = pathSep; | |
1085 break; | |
1086 default: | |
1087 *q++ = *p; | |
1088 } | |
1089 } | |
1090 *q = '\0'; | |
1091 | |
1092 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
1093 return formatted_path; | |
1094 } | |
1095 | |
1096 | |
1097 bool os::set_boot_path(char fileSep, char pathSep) { | |
1098 const char* home = Arguments::get_java_home(); | |
1099 int home_len = (int)strlen(home); | |
1100 | |
1101 static const char* meta_index_dir_format = "%/lib/"; | |
1102 static const char* meta_index_format = "%/lib/meta-index"; | |
1103 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
1104 if (meta_index == NULL) return false; | |
1105 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
1106 if (meta_index_dir == NULL) return false; | |
1107 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
1108 | |
1109 // Any modification to the JAR-file list, for the boot classpath must be | |
1110 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
1111 // path class JARs, are stripped for StackMapTable to reduce download size. | |
1112 static const char classpath_format[] = | |
1113 "%/lib/resources.jar:" | |
1114 "%/lib/rt.jar:" | |
1115 "%/lib/sunrsasign.jar:" | |
1116 "%/lib/jsse.jar:" | |
1117 "%/lib/jce.jar:" | |
1118 "%/lib/charsets.jar:" | |
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1119 "%/lib/jfr.jar:" |
4006 | 1120 #ifdef __APPLE__ |
1121 "%/lib/JObjC.jar:" | |
1122 #endif | |
0 | 1123 "%/classes"; |
1124 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
1125 if (sysclasspath == NULL) return false; | |
1126 Arguments::set_sysclasspath(sysclasspath); | |
1127 | |
1128 return true; | |
1129 } | |
1130 | |
691 | 1131 /* |
1132 * Splits a path, based on its separator, the number of | |
1133 * elements is returned back in n. | |
1134 * It is the callers responsibility to: | |
1135 * a> check the value of n, and n may be 0. | |
1136 * b> ignore any empty path elements | |
1137 * c> free up the data. | |
1138 */ | |
1139 char** os::split_path(const char* path, int* n) { | |
1140 *n = 0; | |
1141 if (path == NULL || strlen(path) == 0) { | |
1142 return NULL; | |
1143 } | |
1144 const char psepchar = *os::path_separator(); | |
6197 | 1145 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); |
691 | 1146 if (inpath == NULL) { |
1147 return NULL; | |
1148 } | |
1149 strncpy(inpath, path, strlen(path)); | |
1150 int count = 1; | |
1151 char* p = strchr(inpath, psepchar); | |
1152 // Get a count of elements to allocate memory | |
1153 while (p != NULL) { | |
1154 count++; | |
1155 p++; | |
1156 p = strchr(p, psepchar); | |
1157 } | |
6197 | 1158 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); |
691 | 1159 if (opath == NULL) { |
1160 return NULL; | |
1161 } | |
1162 | |
1163 // do the actual splitting | |
1164 p = inpath; | |
1165 for (int i = 0 ; i < count ; i++) { | |
1166 size_t len = strcspn(p, os::path_separator()); | |
1167 if (len > JVM_MAXPATHLEN) { | |
1168 return NULL; | |
1169 } | |
1170 // allocate the string and add terminator storage | |
6197 | 1171 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); |
691 | 1172 if (s == NULL) { |
1173 return NULL; | |
1174 } | |
1175 strncpy(s, p, len); | |
1176 s[len] = '\0'; | |
1177 opath[i] = s; | |
1178 p += len + 1; | |
1179 } | |
6197 | 1180 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); |
691 | 1181 *n = count; |
1182 return opath; | |
1183 } | |
1184 | |
0 | 1185 void os::set_memory_serialize_page(address page) { |
1186 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
1187 _mem_serialize_page = (volatile int32_t *)page; | |
1188 // We initialize the serialization page shift count here | |
1189 // We assume a cache line size of 64 bytes | |
1190 assert(SerializePageShiftCount == count, | |
1191 "thread size changed, fix SerializePageShiftCount constant"); | |
1192 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
1193 } | |
1194 | |
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1195 static volatile intptr_t SerializePageLock = 0; |
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1196 |
0 | 1197 // This method is called from signal handler when SIGSEGV occurs while the current |
1198 // thread tries to store to the "read-only" memory serialize page during state | |
1199 // transition. | |
1200 void os::block_on_serialize_page_trap() { | |
1201 if (TraceSafepoint) { | |
1202 tty->print_cr("Block until the serialize page permission restored"); | |
1203 } | |
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1204 // When VMThread is holding the SerializePageLock during modifying the |
0 | 1205 // access permission of the memory serialize page, the following call |
1206 // will block until the permission of that page is restored to rw. | |
1207 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
1208 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1209 // it can occur. |
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1210 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1211 Thread::muxRelease(&SerializePageLock); |
0 | 1212 } |
1213 | |
1214 // Serialize all thread state variables | |
1215 void os::serialize_thread_states() { | |
1216 // On some platforms such as Solaris & Linux, the time duration of the page | |
1217 // permission restoration is observed to be much longer than expected due to | |
1218 // scheduler starvation problem etc. To avoid the long synchronization | |
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1219 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1220 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1221 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1222 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1223 os::vm_page_size(), MEM_PROT_READ); |
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1224 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1225 os::vm_page_size(), MEM_PROT_RW); |
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1226 Thread::muxRelease(&SerializePageLock); |
0 | 1227 } |
1228 | |
1229 // Returns true if the current stack pointer is above the stack shadow | |
1230 // pages, false otherwise. | |
1231 | |
1232 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
1233 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
1234 address sp = current_stack_pointer(); | |
1235 // Check if we have StackShadowPages above the yellow zone. This parameter | |
605 | 1236 // is dependent on the depth of the maximum VM call stack possible from |
0 | 1237 // the handler for stack overflow. 'instanceof' in the stack overflow |
1238 // handler or a println uses at least 8k stack of VM and native code | |
1239 // respectively. | |
1240 const int framesize_in_bytes = | |
1241 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
1242 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
1243 * vm_page_size()) + framesize_in_bytes; | |
1244 // The very lower end of the stack | |
1245 address stack_limit = thread->stack_base() - thread->stack_size(); | |
1246 return (sp > (stack_limit + reserved_area)); | |
1247 } | |
1248 | |
1249 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
1250 uint min_pages) | |
1251 { | |
1252 assert(min_pages > 0, "sanity"); | |
1253 if (UseLargePages) { | |
1254 const size_t max_page_size = region_max_size / min_pages; | |
1255 | |
1256 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
1257 const size_t sz = _page_sizes[i]; | |
1258 const size_t mask = sz - 1; | |
1259 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
1260 // The largest page size with no fragmentation. | |
1261 return sz; | |
1262 } | |
1263 | |
1264 if (sz <= max_page_size) { | |
1265 // The largest page size that satisfies the min_pages requirement. | |
1266 return sz; | |
1267 } | |
1268 } | |
1269 } | |
1270 | |
1271 return vm_page_size(); | |
1272 } | |
1273 | |
1274 #ifndef PRODUCT | |
3859 | 1275 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) |
1276 { | |
1277 if (TracePageSizes) { | |
1278 tty->print("%s: ", str); | |
1279 for (int i = 0; i < count; ++i) { | |
1280 tty->print(" " SIZE_FORMAT, page_sizes[i]); | |
1281 } | |
1282 tty->cr(); | |
1283 } | |
1284 } | |
1285 | |
0 | 1286 void os::trace_page_sizes(const char* str, const size_t region_min_size, |
1287 const size_t region_max_size, const size_t page_size, | |
1288 const char* base, const size_t size) | |
1289 { | |
1290 if (TracePageSizes) { | |
1291 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
1292 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
1293 " size=" SIZE_FORMAT, | |
1294 str, region_min_size, region_max_size, | |
1295 page_size, base, size); | |
1296 } | |
1297 } | |
1298 #endif // #ifndef PRODUCT | |
1299 | |
1300 // This is the working definition of a server class machine: | |
1301 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
1302 // because the graphics memory (?) sometimes masks physical memory. | |
1303 // If you want to change the definition of a server class machine | |
1304 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
1305 // then you'll have to parameterize this method based on that state, | |
1306 // as was done for logical processors here, or replicate and | |
1307 // specialize this method for each platform. (Or fix os to have | |
1308 // some inheritance structure and use subclassing. Sigh.) | |
1309 // If you want some platform to always or never behave as a server | |
1310 // class machine, change the setting of AlwaysActAsServerClassMachine | |
1311 // and NeverActAsServerClassMachine in globals*.hpp. | |
1312 bool os::is_server_class_machine() { | |
1313 // First check for the early returns | |
1314 if (NeverActAsServerClassMachine) { | |
1315 return false; | |
1316 } | |
1317 if (AlwaysActAsServerClassMachine) { | |
1318 return true; | |
1319 } | |
1320 // Then actually look at the machine | |
1321 bool result = false; | |
1322 const unsigned int server_processors = 2; | |
1323 const julong server_memory = 2UL * G; | |
1324 // We seem not to get our full complement of memory. | |
1325 // We allow some part (1/8?) of the memory to be "missing", | |
1326 // based on the sizes of DIMMs, and maybe graphics cards. | |
1327 const julong missing_memory = 256UL * M; | |
1328 | |
1329 /* Is this a server class machine? */ | |
1330 if ((os::active_processor_count() >= (int)server_processors) && | |
1331 (os::physical_memory() >= (server_memory - missing_memory))) { | |
1332 const unsigned int logical_processors = | |
1333 VM_Version::logical_processors_per_package(); | |
1334 if (logical_processors > 1) { | |
1335 const unsigned int physical_packages = | |
1336 os::active_processor_count() / logical_processors; | |
1337 if (physical_packages > server_processors) { | |
1338 result = true; | |
1339 } | |
1340 } else { | |
1341 result = true; | |
1342 } | |
1343 } | |
1344 return result; | |
1345 } | |
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1346 |
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1347 // Read file line by line, if line is longer than bsize, |
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1348 // skip rest of line. |
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1349 int os::get_line_chars(int fd, char* buf, const size_t bsize){ |
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1350 size_t sz, i = 0; |
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1351 |
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1352 // read until EOF, EOL or buf is full |
3832 | 1353 while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-2) && buf[i] != '\n') { |
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1354 ++i; |
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1355 } |
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1356 |
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1357 if (buf[i] == '\n') { |
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1358 // EOL reached so ignore EOL character and return |
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1359 |
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1360 buf[i] = 0; |
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1361 return (int) i; |
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1362 } |
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1363 |
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1364 buf[i+1] = 0; |
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1365 |
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1366 if (sz != 1) { |
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1367 // EOF reached. if we read chars before EOF return them and |
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1368 // return EOF on next call otherwise return EOF |
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1369 |
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1370 return (i == 0) ? -1 : (int) i; |
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1371 } |
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1372 |
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1373 // line is longer than size of buf, skip to EOL |
3832 | 1374 char ch; |
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1375 while (read(fd, &ch, 1) == 1 && ch != '\n') { |
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1376 // Do nothing |
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1377 } |
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1378 |
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1379 // return initial part of line that fits in buf. |
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1380 // If we reached EOF, it will be returned on next call. |
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1381 |
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1382 return (int) i; |
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1383 } |
6197 | 1384 |
1385 bool os::create_stack_guard_pages(char* addr, size_t bytes) { | |
1386 return os::pd_create_stack_guard_pages(addr, bytes); | |
1387 } | |
1388 | |
1389 | |
1390 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { | |
1391 char* result = pd_reserve_memory(bytes, addr, alignment_hint); | |
1392 if (result != NULL && MemTracker::is_on()) { | |
1393 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); | |
1394 } | |
1395 | |
1396 return result; | |
1397 } | |
1398 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { | |
1399 char* result = pd_attempt_reserve_memory_at(bytes, addr); | |
1400 if (result != NULL && MemTracker::is_on()) { | |
1401 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); | |
1402 } | |
1403 return result; | |
1404 } | |
1405 | |
1406 void os::split_reserved_memory(char *base, size_t size, | |
1407 size_t split, bool realloc) { | |
1408 pd_split_reserved_memory(base, size, split, realloc); | |
1409 } | |
1410 | |
1411 bool os::commit_memory(char* addr, size_t bytes, bool executable) { | |
1412 bool res = pd_commit_memory(addr, bytes, executable); | |
1413 if (res && MemTracker::is_on()) { | |
1414 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); | |
1415 } | |
1416 return res; | |
1417 } | |
1418 | |
1419 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, | |
1420 bool executable) { | |
1421 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); | |
1422 if (res && MemTracker::is_on()) { | |
1423 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); | |
1424 } | |
1425 return res; | |
1426 } | |
1427 | |
1428 bool os::uncommit_memory(char* addr, size_t bytes) { | |
1429 bool res = pd_uncommit_memory(addr, bytes); | |
1430 if (res) { | |
1431 MemTracker::record_virtual_memory_uncommit((address)addr, bytes); | |
1432 } | |
1433 return res; | |
1434 } | |
1435 | |
1436 bool os::release_memory(char* addr, size_t bytes) { | |
1437 bool res = pd_release_memory(addr, bytes); | |
1438 if (res) { | |
1439 MemTracker::record_virtual_memory_release((address)addr, bytes); | |
1440 } | |
1441 return res; | |
1442 } | |
1443 | |
1444 | |
1445 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
1446 char *addr, size_t bytes, bool read_only, | |
1447 bool allow_exec) { | |
1448 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); | |
1449 if (result != NULL && MemTracker::is_on()) { | |
1450 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); | |
1451 } | |
1452 return result; | |
1453 } | |
1454 | |
1455 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
1456 char *addr, size_t bytes, bool read_only, | |
1457 bool allow_exec) { | |
1458 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, | |
1459 read_only, allow_exec); | |
1460 } | |
1461 | |
1462 bool os::unmap_memory(char *addr, size_t bytes) { | |
1463 bool result = pd_unmap_memory(addr, bytes); | |
1464 if (result) { | |
1465 MemTracker::record_virtual_memory_release((address)addr, bytes); | |
1466 } | |
1467 return result; | |
1468 } | |
1469 | |
1470 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1471 pd_free_memory(addr, bytes, alignment_hint); | |
1472 } | |
1473 | |
1474 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1475 pd_realign_memory(addr, bytes, alignment_hint); | |
1476 } | |
1477 |