Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 8390:acc24060b64f
Use implicit null checks for all null checks
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 18 Mar 2013 14:45:36 +0100 |
parents | 3ebe0b86736e |
children | b9a918201d47 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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" | |
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47 #include "runtime/thread.inline.hpp" |
1972 | 48 #include "services/attachListener.hpp" |
6197 | 49 #include "services/memTracker.hpp" |
1972 | 50 #include "services/threadService.hpp" |
51 #include "utilities/defaultStream.hpp" | |
52 #include "utilities/events.hpp" | |
53 #ifdef TARGET_OS_FAMILY_linux | |
54 # include "os_linux.inline.hpp" | |
55 #endif | |
56 #ifdef TARGET_OS_FAMILY_solaris | |
57 # include "os_solaris.inline.hpp" | |
58 #endif | |
59 #ifdef TARGET_OS_FAMILY_windows | |
60 # include "os_windows.inline.hpp" | |
61 #endif | |
3960 | 62 #ifdef TARGET_OS_FAMILY_bsd |
63 # include "os_bsd.inline.hpp" | |
64 #endif | |
0 | 65 |
66 # include <signal.h> | |
67 | |
68 OSThread* os::_starting_thread = NULL; | |
69 address os::_polling_page = NULL; | |
70 volatile int32_t* os::_mem_serialize_page = NULL; | |
71 uintptr_t os::_serialize_page_mask = 0; | |
72 long os::_rand_seed = 1; | |
73 int os::_processor_count = 0; | |
74 size_t os::_page_sizes[os::page_sizes_max]; | |
75 | |
76 #ifndef PRODUCT | |
2250 | 77 julong os::num_mallocs = 0; // # of calls to malloc/realloc |
78 julong os::alloc_bytes = 0; // # of bytes allocated | |
79 julong os::num_frees = 0; // # of calls to free | |
80 julong os::free_bytes = 0; // # of bytes freed | |
0 | 81 #endif |
82 | |
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83 void os_init_globals() { |
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84 // Called from init_globals(). |
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85 // See Threads::create_vm() in thread.cpp, and init.cpp. |
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86 os::init_globals(); |
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87 } |
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88 |
0 | 89 // Fill in buffer with current local time as an ISO-8601 string. |
90 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
91 // Returns buffer, or NULL if it failed. | |
92 // This would mostly be a call to | |
93 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
94 // except that on Windows the %z behaves badly, so we do it ourselves. | |
95 // Also, people wanted milliseconds on there, | |
96 // and strftime doesn't do milliseconds. | |
97 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
98 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
99 // 1 2 | |
100 // 12345678901234567890123456789 | |
101 static const char* iso8601_format = | |
102 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
103 static const size_t needed_buffer = 29; | |
104 | |
105 // Sanity check the arguments | |
106 if (buffer == NULL) { | |
107 assert(false, "NULL buffer"); | |
108 return NULL; | |
109 } | |
110 if (buffer_length < needed_buffer) { | |
111 assert(false, "buffer_length too small"); | |
112 return NULL; | |
113 } | |
114 // Get the current time | |
61 | 115 jlong milliseconds_since_19700101 = javaTimeMillis(); |
0 | 116 const int milliseconds_per_microsecond = 1000; |
117 const time_t seconds_since_19700101 = | |
118 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
119 const int milliseconds_after_second = | |
120 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
121 // Convert the time value to a tm and timezone variable | |
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122 struct tm time_struct; |
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123 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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124 assert(false, "Failed localtime_pd"); |
0 | 125 return NULL; |
126 } | |
3960 | 127 #if defined(_ALLBSD_SOURCE) |
128 const time_t zone = (time_t) time_struct.tm_gmtoff; | |
129 #else | |
0 | 130 const time_t zone = timezone; |
3960 | 131 #endif |
0 | 132 |
133 // If daylight savings time is in effect, | |
134 // we are 1 hour East of our time zone | |
135 const time_t seconds_per_minute = 60; | |
136 const time_t minutes_per_hour = 60; | |
137 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
138 time_t UTC_to_local = zone; | |
139 if (time_struct.tm_isdst > 0) { | |
140 UTC_to_local = UTC_to_local - seconds_per_hour; | |
141 } | |
142 // Compute the time zone offset. | |
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143 // localtime_pd() sets timezone to the difference (in seconds) |
0 | 144 // between UTC and and local time. |
145 // ISO 8601 says we need the difference between local time and UTC, | |
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146 // we change the sign of the localtime_pd() result. |
0 | 147 const time_t local_to_UTC = -(UTC_to_local); |
148 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
149 char sign_local_to_UTC = '+'; | |
150 time_t abs_local_to_UTC = local_to_UTC; | |
151 if (local_to_UTC < 0) { | |
152 sign_local_to_UTC = '-'; | |
153 abs_local_to_UTC = -(abs_local_to_UTC); | |
154 } | |
155 // Convert time zone offset seconds to hours and minutes. | |
156 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
157 const time_t zone_min = | |
158 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
159 | |
160 // Print an ISO 8601 date and time stamp into the buffer | |
161 const int year = 1900 + time_struct.tm_year; | |
162 const int month = 1 + time_struct.tm_mon; | |
163 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
164 year, | |
165 month, | |
166 time_struct.tm_mday, | |
167 time_struct.tm_hour, | |
168 time_struct.tm_min, | |
169 time_struct.tm_sec, | |
170 milliseconds_after_second, | |
171 sign_local_to_UTC, | |
172 zone_hours, | |
173 zone_min); | |
174 if (printed == 0) { | |
175 assert(false, "Failed jio_printf"); | |
176 return NULL; | |
177 } | |
178 return buffer; | |
179 } | |
180 | |
181 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
182 #ifdef ASSERT | |
183 if (!(!thread->is_Java_thread() || | |
184 Thread::current() == thread || | |
185 Threads_lock->owned_by_self() | |
186 || thread->is_Compiler_thread() | |
187 )) { | |
188 assert(false, "possibility of dangling Thread pointer"); | |
189 } | |
190 #endif | |
191 | |
192 if (p >= MinPriority && p <= MaxPriority) { | |
193 int priority = java_to_os_priority[p]; | |
194 return set_native_priority(thread, priority); | |
195 } else { | |
196 assert(false, "Should not happen"); | |
197 return OS_ERR; | |
198 } | |
199 } | |
200 | |
6766 | 201 // The mapping from OS priority back to Java priority may be inexact because |
202 // Java priorities can map M:1 with native priorities. If you want the definite | |
203 // Java priority then use JavaThread::java_priority() | |
0 | 204 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { |
205 int p; | |
206 int os_prio; | |
207 OSReturn ret = get_native_priority(thread, &os_prio); | |
208 if (ret != OS_OK) return ret; | |
209 | |
6766 | 210 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { |
211 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
212 } else { | |
213 // niceness values are in reverse order | |
214 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; | |
215 } | |
0 | 216 priority = (ThreadPriority)p; |
217 return OS_OK; | |
218 } | |
219 | |
220 | |
221 // --------------------- sun.misc.Signal (optional) --------------------- | |
222 | |
223 | |
224 // SIGBREAK is sent by the keyboard to query the VM state | |
225 #ifndef SIGBREAK | |
226 #define SIGBREAK SIGQUIT | |
227 #endif | |
228 | |
229 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
230 | |
231 | |
232 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
233 os::set_priority(thread, NearMaxPriority); | |
234 while (true) { | |
235 int sig; | |
236 { | |
237 // FIXME : Currently we have not decieded what should be the status | |
238 // for this java thread blocked here. Once we decide about | |
239 // that we should fix this. | |
240 sig = os::signal_wait(); | |
241 } | |
242 if (sig == os::sigexitnum_pd()) { | |
243 // Terminate the signal thread | |
244 return; | |
245 } | |
246 | |
247 switch (sig) { | |
248 case SIGBREAK: { | |
249 // Check if the signal is a trigger to start the Attach Listener - in that | |
250 // case don't print stack traces. | |
251 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
252 continue; | |
253 } | |
254 // Print stack traces | |
255 // Any SIGBREAK operations added here should make sure to flush | |
256 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
257 // Each module also prints an extra carriage return after its output. | |
258 VM_PrintThreads op; | |
259 VMThread::execute(&op); | |
260 VM_PrintJNI jni_op; | |
261 VMThread::execute(&jni_op); | |
262 VM_FindDeadlocks op1(tty); | |
263 VMThread::execute(&op1); | |
264 Universe::print_heap_at_SIGBREAK(); | |
265 if (PrintClassHistogram) { | |
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266 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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267 true /* need_prologue */); |
0 | 268 VMThread::execute(&op1); |
269 } | |
270 if (JvmtiExport::should_post_data_dump()) { | |
271 JvmtiExport::post_data_dump(); | |
272 } | |
273 break; | |
274 } | |
275 default: { | |
276 // Dispatch the signal to java | |
277 HandleMark hm(THREAD); | |
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278 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
0 | 279 KlassHandle klass (THREAD, k); |
280 if (klass.not_null()) { | |
281 JavaValue result(T_VOID); | |
282 JavaCallArguments args; | |
283 args.push_int(sig); | |
284 JavaCalls::call_static( | |
285 &result, | |
286 klass, | |
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287 vmSymbols::dispatch_name(), |
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288 vmSymbols::int_void_signature(), |
0 | 289 &args, |
290 THREAD | |
291 ); | |
292 } | |
293 if (HAS_PENDING_EXCEPTION) { | |
294 // tty is initialized early so we don't expect it to be null, but | |
295 // if it is we can't risk doing an initialization that might | |
296 // trigger additional out-of-memory conditions | |
297 if (tty != NULL) { | |
298 char klass_name[256]; | |
299 char tmp_sig_name[16]; | |
300 const char* sig_name = "UNKNOWN"; | |
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301 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> |
0 | 302 name()->as_klass_external_name(klass_name, 256); |
303 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
304 sig_name = tmp_sig_name; | |
305 warning("Exception %s occurred dispatching signal %s to handler" | |
306 "- the VM may need to be forcibly terminated", | |
307 klass_name, sig_name ); | |
308 } | |
309 CLEAR_PENDING_EXCEPTION; | |
310 } | |
311 } | |
312 } | |
313 } | |
314 } | |
315 | |
316 | |
317 void os::signal_init() { | |
318 if (!ReduceSignalUsage) { | |
319 // Setup JavaThread for processing signals | |
320 EXCEPTION_MARK; | |
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321 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 322 instanceKlassHandle klass (THREAD, k); |
323 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
324 | |
325 const char thread_name[] = "Signal Dispatcher"; | |
326 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
327 | |
328 // Initialize thread_oop to put it into the system threadGroup | |
329 Handle thread_group (THREAD, Universe::system_thread_group()); | |
330 JavaValue result(T_VOID); | |
331 JavaCalls::call_special(&result, thread_oop, | |
332 klass, | |
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333 vmSymbols::object_initializer_name(), |
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334 vmSymbols::threadgroup_string_void_signature(), |
0 | 335 thread_group, |
336 string, | |
337 CHECK); | |
338 | |
1142 | 339 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 340 JavaCalls::call_special(&result, |
341 thread_group, | |
342 group, | |
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343 vmSymbols::add_method_name(), |
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344 vmSymbols::thread_void_signature(), |
0 | 345 thread_oop, // ARG 1 |
346 CHECK); | |
347 | |
348 os::signal_init_pd(); | |
349 | |
350 { MutexLocker mu(Threads_lock); | |
351 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
352 | |
353 // At this point it may be possible that no osthread was created for the | |
354 // JavaThread due to lack of memory. We would have to throw an exception | |
355 // in that case. However, since this must work and we do not allow | |
356 // exceptions anyway, check and abort if this fails. | |
357 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
358 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
359 "unable to create new native thread"); | |
360 } | |
361 | |
362 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
363 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
364 java_lang_Thread::set_daemon(thread_oop()); | |
365 | |
366 signal_thread->set_threadObj(thread_oop()); | |
367 Threads::add(signal_thread); | |
368 Thread::start(signal_thread); | |
369 } | |
370 // Handle ^BREAK | |
371 os::signal(SIGBREAK, os::user_handler()); | |
372 } | |
373 } | |
374 | |
375 | |
376 void os::terminate_signal_thread() { | |
377 if (!ReduceSignalUsage) | |
378 signal_notify(sigexitnum_pd()); | |
379 } | |
380 | |
381 | |
382 // --------------------- loading libraries --------------------- | |
383 | |
384 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
385 extern struct JavaVM_ main_vm; | |
386 | |
387 static void* _native_java_library = NULL; | |
388 | |
389 void* os::native_java_library() { | |
390 if (_native_java_library == NULL) { | |
391 char buffer[JVM_MAXPATHLEN]; | |
392 char ebuf[1024]; | |
393 | |
242 | 394 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
395 // always able to find it when the loading executable is outside the JDK. | |
0 | 396 // In order to keep working with 1.2 we ignore any loading errors. |
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397 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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398 "verify")) { |
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399 dll_load(buffer, ebuf, sizeof(ebuf)); |
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400 } |
0 | 401 |
402 // Load java dll | |
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403 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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404 "java")) { |
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405 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); |
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406 } |
0 | 407 if (_native_java_library == NULL) { |
408 vm_exit_during_initialization("Unable to load native library", ebuf); | |
409 } | |
3960 | 410 |
411 #if defined(__OpenBSD__) | |
412 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so | |
413 // ignore errors | |
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414 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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415 "net")) { |
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416 dll_load(buffer, ebuf, sizeof(ebuf)); |
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417 } |
3960 | 418 #endif |
242 | 419 } |
420 static jboolean onLoaded = JNI_FALSE; | |
421 if (onLoaded) { | |
422 // We may have to wait to fire OnLoad until TLS is initialized. | |
423 if (ThreadLocalStorage::is_initialized()) { | |
424 // The JNI_OnLoad handling is normally done by method load in | |
425 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
426 // explicitly so we have to check for JNI_OnLoad as well | |
427 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
428 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
429 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
430 if (JNI_OnLoad != NULL) { | |
431 JavaThread* thread = JavaThread::current(); | |
432 ThreadToNativeFromVM ttn(thread); | |
433 HandleMark hm(thread); | |
434 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
435 onLoaded = JNI_TRUE; | |
436 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
437 vm_exit_during_initialization("Unsupported JNI version"); | |
438 } | |
0 | 439 } |
440 } | |
441 } | |
442 return _native_java_library; | |
443 } | |
444 | |
445 // --------------------- heap allocation utilities --------------------- | |
446 | |
6197 | 447 char *os::strdup(const char *str, MEMFLAGS flags) { |
0 | 448 size_t size = strlen(str); |
6197 | 449 char *dup_str = (char *)malloc(size + 1, flags); |
0 | 450 if (dup_str == NULL) return NULL; |
451 strcpy(dup_str, str); | |
452 return dup_str; | |
453 } | |
454 | |
455 | |
456 | |
457 #ifdef ASSERT | |
458 #define space_before (MallocCushion + sizeof(double)) | |
459 #define space_after MallocCushion | |
460 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
461 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
462 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
463 // NB: cannot be debug variable, because these aren't set from the command line until | |
464 // *after* the first few allocs already happened | |
465 #define MallocCushion 16 | |
466 #else | |
467 #define space_before 0 | |
468 #define space_after 0 | |
469 #define size_addr_from_base(p) should not use w/o ASSERT | |
470 #define size_addr_from_obj(p) should not use w/o ASSERT | |
471 #define MallocCushion 0 | |
472 #endif | |
473 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
474 | |
475 #ifdef ASSERT | |
476 inline size_t get_size(void* obj) { | |
477 size_t size = *size_addr_from_obj(obj); | |
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478 if (size < 0) { |
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479 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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480 SIZE_FORMAT ")", obj, size)); |
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481 } |
0 | 482 return size; |
483 } | |
484 | |
485 u_char* find_cushion_backwards(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 start | |
490 u_char* q = p - 4; | |
491 while (*q == badResourceValue) q--; | |
492 return q + 1; | |
493 } | |
494 | |
495 u_char* find_cushion_forwards(u_char* start) { | |
496 u_char* p = start; | |
497 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
498 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
499 // ok, we have four consecutive marker bytes; find end of cushion | |
500 u_char* q = p + 4; | |
501 while (*q == badResourceValue) q++; | |
502 return q - MallocCushion; | |
503 } | |
504 | |
505 void print_neighbor_blocks(void* ptr) { | |
506 // find block allocated before ptr (not entirely crash-proof) | |
507 if (MallocCushion < 4) { | |
508 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
509 return; | |
510 } | |
511 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
512 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
513 // look for cushion in front of prev. block | |
514 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
515 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
516 u_char* obj = start_of_prev_block + space_before; | |
517 if (size <= 0 ) { | |
518 // start is bad; mayhave been confused by OS data inbetween objects | |
519 // search one more backwards | |
520 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
521 size = *size_addr_from_base(start_of_prev_block); | |
522 obj = start_of_prev_block + space_before; | |
523 } | |
524 | |
525 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
2250 | 526 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 527 } else { |
2250 | 528 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 529 } |
530 | |
531 // now find successor block | |
532 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
533 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
534 u_char* next_obj = start_of_next_block + space_before; | |
535 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
536 if (start_of_next_block[0] == badResourceValue && | |
537 start_of_next_block[1] == badResourceValue && | |
538 start_of_next_block[2] == badResourceValue && | |
539 start_of_next_block[3] == badResourceValue) { | |
2250 | 540 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 541 } else { |
2250 | 542 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 543 } |
544 } | |
545 | |
546 | |
547 void report_heap_error(void* memblock, void* bad, const char* where) { | |
2250 | 548 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
549 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
0 | 550 print_neighbor_blocks(memblock); |
551 fatal("memory stomping error"); | |
552 } | |
553 | |
554 void verify_block(void* memblock) { | |
555 size_t size = get_size(memblock); | |
556 if (MallocCushion) { | |
557 u_char* ptr = (u_char*)memblock - space_before; | |
558 for (int i = 0; i < MallocCushion; i++) { | |
559 if (ptr[i] != badResourceValue) { | |
560 report_heap_error(memblock, ptr+i, "in front of"); | |
561 } | |
562 } | |
563 u_char* end = (u_char*)memblock + size + space_after; | |
564 for (int j = -MallocCushion; j < 0; j++) { | |
565 if (end[j] != badResourceValue) { | |
566 report_heap_error(memblock, end+j, "after"); | |
567 } | |
568 } | |
569 } | |
570 } | |
571 #endif | |
572 | |
6197 | 573 void* os::malloc(size_t size, MEMFLAGS memflags, address caller) { |
2250 | 574 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
575 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
0 | 576 |
577 if (size == 0) { | |
578 // return a valid pointer if size is zero | |
579 // if NULL is returned the calling functions assume out of memory. | |
580 size = 1; | |
581 } | |
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582 if (size > size + space_before + space_after) { // Check for rollover. |
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583 return NULL; |
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584 } |
0 | 585 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); |
586 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
6197 | 587 |
0 | 588 #ifdef ASSERT |
589 if (ptr == NULL) return NULL; | |
590 if (MallocCushion) { | |
591 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
592 u_char* end = ptr + space_before + size; | |
593 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
594 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
595 } | |
596 // put size just before data | |
597 *size_addr_from_base(ptr) = size; | |
598 #endif | |
599 u_char* memblock = ptr + space_before; | |
600 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 601 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
0 | 602 breakpoint(); |
603 } | |
604 debug_only(if (paranoid) verify_block(memblock)); | |
2250 | 605 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
6197 | 606 |
607 // we do not track MallocCushion memory | |
608 MemTracker::record_malloc((address)memblock, size, memflags, caller == 0 ? CALLER_PC : caller); | |
609 | |
0 | 610 return memblock; |
611 } | |
612 | |
613 | |
6197 | 614 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, address caller) { |
0 | 615 #ifndef ASSERT |
2250 | 616 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
617 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
6197 | 618 void* ptr = ::realloc(memblock, size); |
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619 if (ptr != NULL) { |
6197 | 620 MemTracker::record_realloc((address)memblock, (address)ptr, size, memflags, |
621 caller == 0 ? CALLER_PC : caller); | |
622 } | |
623 return ptr; | |
0 | 624 #else |
625 if (memblock == NULL) { | |
6197 | 626 return malloc(size, memflags, (caller == 0 ? CALLER_PC : caller)); |
0 | 627 } |
628 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 629 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
0 | 630 breakpoint(); |
631 } | |
632 verify_block(memblock); | |
633 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
634 if (size == 0) return NULL; | |
635 // always move the block | |
6197 | 636 void* ptr = malloc(size, memflags, caller == 0 ? CALLER_PC : caller); |
2250 | 637 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
0 | 638 // Copy to new memory if malloc didn't fail |
639 if ( ptr != NULL ) { | |
640 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
641 if (paranoid) verify_block(ptr); | |
642 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
2250 | 643 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
0 | 644 breakpoint(); |
645 } | |
646 free(memblock); | |
647 } | |
648 return ptr; | |
649 #endif | |
650 } | |
651 | |
652 | |
6197 | 653 void os::free(void *memblock, MEMFLAGS memflags) { |
2250 | 654 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
0 | 655 #ifdef ASSERT |
656 if (memblock == NULL) return; | |
657 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 658 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
0 | 659 breakpoint(); |
660 } | |
661 verify_block(memblock); | |
662 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
663 // Added by detlefs. | |
664 if (MallocCushion) { | |
665 u_char* ptr = (u_char*)memblock - space_before; | |
666 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
667 guarantee(*p == badResourceValue, | |
668 "Thing freed should be malloc result."); | |
669 *p = (u_char)freeBlockPad; | |
670 } | |
671 size_t size = get_size(memblock); | |
2250 | 672 inc_stat_counter(&free_bytes, size); |
0 | 673 u_char* end = ptr + space_before + size; |
674 for (u_char* q = end; q < end + MallocCushion; q++) { | |
675 guarantee(*q == badResourceValue, | |
676 "Thing freed should be malloc result."); | |
677 *q = (u_char)freeBlockPad; | |
678 } | |
2250 | 679 if (PrintMalloc && tty != NULL) |
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680 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
2250 | 681 } else if (PrintMalloc && tty != NULL) { |
682 // tty->print_cr("os::free %p", memblock); | |
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683 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
0 | 684 } |
685 #endif | |
6197 | 686 MemTracker::record_free((address)memblock, memflags); |
687 | |
0 | 688 ::free((char*)memblock - space_before); |
689 } | |
690 | |
691 void os::init_random(long initval) { | |
692 _rand_seed = initval; | |
693 } | |
694 | |
695 | |
696 long os::random() { | |
697 /* standard, well-known linear congruential random generator with | |
698 * next_rand = (16807*seed) mod (2**31-1) | |
699 * see | |
700 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
701 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
702 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
703 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
704 */ | |
705 const long a = 16807; | |
706 const unsigned long m = 2147483647; | |
707 const long q = m / a; assert(q == 127773, "weird math"); | |
708 const long r = m % a; assert(r == 2836, "weird math"); | |
709 | |
710 // compute az=2^31p+q | |
711 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
712 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
713 lo += (hi & 0x7FFF) << 16; | |
714 | |
715 // if q overflowed, ignore the overflow and increment q | |
716 if (lo > m) { | |
717 lo &= m; | |
718 ++lo; | |
719 } | |
720 lo += hi >> 15; | |
721 | |
722 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
723 if (lo > m) { | |
724 lo &= m; | |
725 ++lo; | |
726 } | |
727 return (_rand_seed = lo); | |
728 } | |
729 | |
730 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
731 // conditions in which a thread is first started are different from those in which | |
732 // a suspension is resumed. These differences make it hard for us to apply the | |
733 // tougher checks when starting threads that we want to do when resuming them. | |
734 // However, when start_thread is called as a result of Thread.start, on a Java | |
735 // thread, the operation is synchronized on the Java Thread object. So there | |
736 // cannot be a race to start the thread and hence for the thread to exit while | |
737 // we are working on it. Non-Java threads that start Java threads either have | |
738 // to do so in a context in which races are impossible, or should do appropriate | |
739 // locking. | |
740 | |
741 void os::start_thread(Thread* thread) { | |
742 // guard suspend/resume | |
743 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
744 OSThread* osthread = thread->osthread(); | |
745 osthread->set_state(RUNNABLE); | |
746 pd_start_thread(thread); | |
747 } | |
748 | |
749 //--------------------------------------------------------------------------- | |
750 // Helper functions for fatal error handler | |
751 | |
752 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
753 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
754 | |
755 int cols = 0; | |
756 int cols_per_line = 0; | |
757 switch (unitsize) { | |
758 case 1: cols_per_line = 16; break; | |
759 case 2: cols_per_line = 8; break; | |
760 case 4: cols_per_line = 4; break; | |
761 case 8: cols_per_line = 2; break; | |
762 default: return; | |
763 } | |
764 | |
765 address p = start; | |
766 st->print(PTR_FORMAT ": ", start); | |
767 while (p < end) { | |
768 switch (unitsize) { | |
769 case 1: st->print("%02x", *(u1*)p); break; | |
770 case 2: st->print("%04x", *(u2*)p); break; | |
771 case 4: st->print("%08x", *(u4*)p); break; | |
772 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
773 } | |
774 p += unitsize; | |
775 cols++; | |
776 if (cols >= cols_per_line && p < end) { | |
777 cols = 0; | |
778 st->cr(); | |
779 st->print(PTR_FORMAT ": ", p); | |
780 } else { | |
781 st->print(" "); | |
782 } | |
783 } | |
784 st->cr(); | |
785 } | |
786 | |
787 void os::print_environment_variables(outputStream* st, const char** env_list, | |
788 char* buffer, int len) { | |
789 if (env_list) { | |
790 st->print_cr("Environment Variables:"); | |
791 | |
792 for (int i = 0; env_list[i] != NULL; i++) { | |
793 if (getenv(env_list[i], buffer, len)) { | |
794 st->print(env_list[i]); | |
795 st->print("="); | |
796 st->print_cr(buffer); | |
797 } | |
798 } | |
799 } | |
800 } | |
801 | |
802 void os::print_cpu_info(outputStream* st) { | |
803 // cpu | |
804 st->print("CPU:"); | |
805 st->print("total %d", os::processor_count()); | |
806 // It's not safe to query number of active processors after crash | |
807 // st->print("(active %d)", os::active_processor_count()); | |
808 st->print(" %s", VM_Version::cpu_features()); | |
809 st->cr(); | |
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810 pd_print_cpu_info(st); |
0 | 811 } |
812 | |
813 void os::print_date_and_time(outputStream *st) { | |
814 time_t tloc; | |
815 (void)time(&tloc); | |
816 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
817 | |
818 double t = os::elapsedTime(); | |
819 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
820 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
821 // before printf. We lost some precision, but who cares? | |
822 st->print_cr("elapsed time: %d seconds", (int)t); | |
823 } | |
824 | |
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825 // moved from debug.cpp (used to be find()) but still called from there |
1907 | 826 // The verbose parameter is only set by the debug code in one case |
827 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
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828 address addr = (address)x; |
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829 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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830 if (b != NULL) { |
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831 if (b->is_buffer_blob()) { |
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832 // the interpreter is generated into a buffer blob |
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833 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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834 if (i != NULL) { |
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835 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); |
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836 i->print_on(st); |
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837 return; |
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838 } |
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839 if (Interpreter::contains(addr)) { |
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840 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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841 " (not bytecode specific)", addr); |
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|
842 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
843 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
844 // |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
845 if (AdapterHandlerLibrary::contains(b)) { |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
846 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
847 AdapterHandlerLibrary::print_handler_on(st, b); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
848 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
849 // the stubroutines are generated into a buffer blob |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
850 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
851 if (d != NULL) { |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
852 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
853 d->print_on(st); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
854 st->cr(); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
855 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
856 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
857 if (StubRoutines::contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
858 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
859 "stub routine", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
860 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
861 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
862 // the InlineCacheBuffer is using stubs generated into a buffer blob |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
863 if (InlineCacheBuffer::contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
864 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
865 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
866 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
867 VtableStub* v = VtableStubs::stub_containing(addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
868 if (v != NULL) { |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
869 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", addr, (int)(addr - v->entry_point())); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
870 v->print_on(st); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
871 st->cr(); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
872 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
873 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
874 } |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
875 nmethod* nm = b->as_nmethod_or_null(); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
876 if (nm != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
877 ResourceMark rm; |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
878 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT, |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
879 addr, (int)(addr - nm->entry_point()), nm); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
880 if (verbose) { |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
881 st->print(" for "); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
882 nm->method()->print_value_on(st); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
883 } |
6816
87ac5c0a404d
8000228: Missing call to cr() when printing entry_point in nmethod, in os::print_location
stefank
parents:
6814
diff
changeset
|
884 st->cr(); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
885 nm->print_nmethod(verbose); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
886 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
887 } |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
888 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", addr, (int)(addr - b->code_begin())); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
889 b->print_on(st); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
890 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
891 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
892 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
893 if (Universe::heap()->is_in(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
894 HeapWord* p = Universe::heap()->block_start(addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
895 bool print = false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
896 // If we couldn't find it it just may mean that heap wasn't parseable |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
897 // See if we were just given an oop directly |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
898 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
899 print = true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
900 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
901 p = (HeapWord*) addr; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
902 print = true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
903 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
904 if (print) { |
6814
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
905 if (p == (HeapWord*) addr) { |
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
906 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
907 } else { |
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
908 st->print_cr(INTPTR_FORMAT " is pointing into object: " INTPTR_FORMAT, addr, p); |
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
909 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
910 oop(p)->print_on(st); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
911 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
912 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
913 } else { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
914 if (Universe::heap()->is_in_reserved(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
915 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
916 "in the heap", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
917 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
918 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
919 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
920 if (JNIHandles::is_global_handle((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
921 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
922 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
923 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
924 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
925 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
926 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
927 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
928 #ifndef PRODUCT |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
929 // we don't keep the block list in product mode |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
930 if (JNIHandleBlock::any_contains((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
931 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
932 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
933 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
934 #endif |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
935 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
936 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
937 // Check for privilege stack |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
938 if (thread->privileged_stack_top() != NULL && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
939 thread->privileged_stack_top()->contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
940 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
941 "for thread: " INTPTR_FORMAT, addr, thread); |
1907 | 942 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
943 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
944 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
945 // If the addr is a java thread print information about that. |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
946 if (addr == (address)thread) { |
1907 | 947 if (verbose) { |
948 thread->print_on(st); | |
949 } else { | |
950 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
951 } | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
952 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
953 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
954 // If the addr is in the stack region for this thread then report that |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
955 // and print thread info |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
956 if (thread->stack_base() >= addr && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
957 addr > (thread->stack_base() - thread->stack_size())) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
958 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
959 INTPTR_FORMAT, addr, thread); |
1907 | 960 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
961 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
962 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
963 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
964 } |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
965 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
966 #ifndef PRODUCT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
967 // Check if in metaspace. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
968 if (ClassLoaderDataGraph::contains((address)addr)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
969 // Use addr->print() from the debugger instead (not here) |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
970 st->print_cr(INTPTR_FORMAT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
971 " is pointing into metadata", addr); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
972 return; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
973 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
974 #endif |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
975 |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
976 // Try an OS specific find |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
977 if (os::find(addr, st)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
978 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
979 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
980 |
1907 | 981 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
982 } |
0 | 983 |
984 // Looks like all platforms except IA64 can use the same function to check | |
985 // if C stack is walkable beyond current frame. The check for fp() is not | |
986 // necessary on Sparc, but it's harmless. | |
987 bool os::is_first_C_frame(frame* fr) { | |
7994 | 988 #if defined(IA64) && !defined(_WIN32) |
989 // On IA64 we have to check if the callers bsp is still valid | |
990 // (i.e. within the register stack bounds). | |
991 // Notice: this only works for threads created by the VM and only if | |
992 // we walk the current stack!!! If we want to be able to walk | |
993 // arbitrary other threads, we'll have to somehow store the thread | |
994 // object in the frame. | |
995 Thread *thread = Thread::current(); | |
996 if ((address)fr->fp() <= | |
997 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { | |
998 // This check is a little hacky, because on Linux the first C | |
999 // frame's ('start_thread') register stack frame starts at | |
1000 // "register_stack_base + 0x48" while on HPUX, the first C frame's | |
1001 // ('__pthread_bound_body') register stack frame seems to really | |
1002 // start at "register_stack_base". | |
1003 return true; | |
1004 } else { | |
1005 return false; | |
1006 } | |
1007 #elif defined(IA64) && defined(_WIN32) | |
0 | 1008 return true; |
7994 | 1009 #else |
0 | 1010 // Load up sp, fp, sender sp and sender fp, check for reasonable values. |
1011 // Check usp first, because if that's bad the other accessors may fault | |
1012 // on some architectures. Ditto ufp second, etc. | |
1013 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
1014 // sp on amd can be 32 bit aligned. | |
1015 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
1016 | |
1017 uintptr_t usp = (uintptr_t)fr->sp(); | |
1018 if ((usp & sp_align_mask) != 0) return true; | |
1019 | |
1020 uintptr_t ufp = (uintptr_t)fr->fp(); | |
1021 if ((ufp & fp_align_mask) != 0) return true; | |
1022 | |
1023 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
1024 if ((old_sp & sp_align_mask) != 0) return true; | |
1025 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
1026 | |
1027 uintptr_t old_fp = (uintptr_t)fr->link(); | |
1028 if ((old_fp & fp_align_mask) != 0) return true; | |
1029 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
1030 | |
1031 // stack grows downwards; if old_fp is below current fp or if the stack | |
1032 // frame is too large, either the stack is corrupted or fp is not saved | |
1033 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
1034 // is not walkable beyond current frame. | |
1035 if (old_fp < ufp) return true; | |
1036 if (old_fp - ufp > 64 * K) return true; | |
1037 | |
1038 return false; | |
7994 | 1039 #endif |
0 | 1040 } |
1041 | |
1042 #ifdef ASSERT | |
1043 extern "C" void test_random() { | |
1044 const double m = 2147483647; | |
1045 double mean = 0.0, variance = 0.0, t; | |
1046 long reps = 10000; | |
1047 unsigned long seed = 1; | |
1048 | |
1049 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
1050 os::init_random(seed); | |
1051 long num; | |
1052 for (int k = 0; k < reps; k++) { | |
1053 num = os::random(); | |
1054 double u = (double)num / m; | |
1055 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
1056 | |
1057 // calculate mean and variance of the random sequence | |
1058 mean += u; | |
1059 variance += (u*u); | |
1060 } | |
1061 mean /= reps; | |
1062 variance /= (reps - 1); | |
1063 | |
1064 assert(num == 1043618065, "bad seed"); | |
1065 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
1066 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
1067 const double eps = 0.0001; | |
1068 t = fabsd(mean - 0.5018); | |
1069 assert(t < eps, "bad mean"); | |
1070 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
1071 assert(t < eps, "bad variance"); | |
1072 } | |
1073 #endif | |
1074 | |
1075 | |
1076 // Set up the boot classpath. | |
1077 | |
1078 char* os::format_boot_path(const char* format_string, | |
1079 const char* home, | |
1080 int home_len, | |
1081 char fileSep, | |
1082 char pathSep) { | |
1083 assert((fileSep == '/' && pathSep == ':') || | |
1084 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
1085 | |
1086 // Scan the format string to determine the length of the actual | |
1087 // boot classpath, and handle platform dependencies as well. | |
1088 int formatted_path_len = 0; | |
1089 const char* p; | |
1090 for (p = format_string; *p != 0; ++p) { | |
1091 if (*p == '%') formatted_path_len += home_len - 1; | |
1092 ++formatted_path_len; | |
1093 } | |
1094 | |
6197 | 1095 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); |
0 | 1096 if (formatted_path == NULL) { |
1097 return NULL; | |
1098 } | |
1099 | |
1100 // Create boot classpath from format, substituting separator chars and | |
1101 // java home directory. | |
1102 char* q = formatted_path; | |
1103 for (p = format_string; *p != 0; ++p) { | |
1104 switch (*p) { | |
1105 case '%': | |
1106 strcpy(q, home); | |
1107 q += home_len; | |
1108 break; | |
1109 case '/': | |
1110 *q++ = fileSep; | |
1111 break; | |
1112 case ':': | |
1113 *q++ = pathSep; | |
1114 break; | |
1115 default: | |
1116 *q++ = *p; | |
1117 } | |
1118 } | |
1119 *q = '\0'; | |
1120 | |
1121 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
1122 return formatted_path; | |
1123 } | |
1124 | |
1125 | |
1126 bool os::set_boot_path(char fileSep, char pathSep) { | |
1127 const char* home = Arguments::get_java_home(); | |
1128 int home_len = (int)strlen(home); | |
1129 | |
1130 static const char* meta_index_dir_format = "%/lib/"; | |
1131 static const char* meta_index_format = "%/lib/meta-index"; | |
1132 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
1133 if (meta_index == NULL) return false; | |
1134 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
1135 if (meta_index_dir == NULL) return false; | |
1136 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
1137 | |
1138 // Any modification to the JAR-file list, for the boot classpath must be | |
1139 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
1140 // path class JARs, are stripped for StackMapTable to reduce download size. | |
1141 static const char classpath_format[] = | |
1142 "%/lib/resources.jar:" | |
1143 "%/lib/rt.jar:" | |
1144 "%/lib/sunrsasign.jar:" | |
1145 "%/lib/jsse.jar:" | |
1146 "%/lib/jce.jar:" | |
1147 "%/lib/charsets.jar:" | |
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1148 "%/lib/jfr.jar:" |
4006 | 1149 #ifdef __APPLE__ |
1150 "%/lib/JObjC.jar:" | |
1151 #endif | |
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1152 #ifdef GRAAL |
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1153 "%/lib/graal.jar:" |
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1154 #endif |
0 | 1155 "%/classes"; |
1156 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
1157 if (sysclasspath == NULL) return false; | |
1158 Arguments::set_sysclasspath(sysclasspath); | |
1159 | |
1160 return true; | |
1161 } | |
1162 | |
691 | 1163 /* |
1164 * Splits a path, based on its separator, the number of | |
1165 * elements is returned back in n. | |
1166 * It is the callers responsibility to: | |
1167 * a> check the value of n, and n may be 0. | |
1168 * b> ignore any empty path elements | |
1169 * c> free up the data. | |
1170 */ | |
1171 char** os::split_path(const char* path, int* n) { | |
1172 *n = 0; | |
1173 if (path == NULL || strlen(path) == 0) { | |
1174 return NULL; | |
1175 } | |
1176 const char psepchar = *os::path_separator(); | |
6197 | 1177 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); |
691 | 1178 if (inpath == NULL) { |
1179 return NULL; | |
1180 } | |
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1181 strcpy(inpath, path); |
691 | 1182 int count = 1; |
1183 char* p = strchr(inpath, psepchar); | |
1184 // Get a count of elements to allocate memory | |
1185 while (p != NULL) { | |
1186 count++; | |
1187 p++; | |
1188 p = strchr(p, psepchar); | |
1189 } | |
6197 | 1190 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); |
691 | 1191 if (opath == NULL) { |
1192 return NULL; | |
1193 } | |
1194 | |
1195 // do the actual splitting | |
1196 p = inpath; | |
1197 for (int i = 0 ; i < count ; i++) { | |
1198 size_t len = strcspn(p, os::path_separator()); | |
1199 if (len > JVM_MAXPATHLEN) { | |
1200 return NULL; | |
1201 } | |
1202 // allocate the string and add terminator storage | |
6197 | 1203 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); |
691 | 1204 if (s == NULL) { |
1205 return NULL; | |
1206 } | |
1207 strncpy(s, p, len); | |
1208 s[len] = '\0'; | |
1209 opath[i] = s; | |
1210 p += len + 1; | |
1211 } | |
6197 | 1212 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); |
691 | 1213 *n = count; |
1214 return opath; | |
1215 } | |
1216 | |
0 | 1217 void os::set_memory_serialize_page(address page) { |
1218 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
1219 _mem_serialize_page = (volatile int32_t *)page; | |
1220 // We initialize the serialization page shift count here | |
1221 // We assume a cache line size of 64 bytes | |
1222 assert(SerializePageShiftCount == count, | |
1223 "thread size changed, fix SerializePageShiftCount constant"); | |
1224 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
1225 } | |
1226 | |
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1227 static volatile intptr_t SerializePageLock = 0; |
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1228 |
0 | 1229 // This method is called from signal handler when SIGSEGV occurs while the current |
1230 // thread tries to store to the "read-only" memory serialize page during state | |
1231 // transition. | |
1232 void os::block_on_serialize_page_trap() { | |
1233 if (TraceSafepoint) { | |
1234 tty->print_cr("Block until the serialize page permission restored"); | |
1235 } | |
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1236 // When VMThread is holding the SerializePageLock during modifying the |
0 | 1237 // access permission of the memory serialize page, the following call |
1238 // will block until the permission of that page is restored to rw. | |
1239 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
1240 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1241 // it can occur. |
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1242 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1243 Thread::muxRelease(&SerializePageLock); |
0 | 1244 } |
1245 | |
1246 // Serialize all thread state variables | |
1247 void os::serialize_thread_states() { | |
1248 // On some platforms such as Solaris & Linux, the time duration of the page | |
1249 // permission restoration is observed to be much longer than expected due to | |
1250 // scheduler starvation problem etc. To avoid the long synchronization | |
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1251 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1252 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1253 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1254 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1255 os::vm_page_size(), MEM_PROT_READ); |
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1256 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1257 os::vm_page_size(), MEM_PROT_RW); |
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1258 Thread::muxRelease(&SerializePageLock); |
0 | 1259 } |
1260 | |
1261 // Returns true if the current stack pointer is above the stack shadow | |
1262 // pages, false otherwise. | |
1263 | |
1264 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
1265 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
1266 address sp = current_stack_pointer(); | |
1267 // Check if we have StackShadowPages above the yellow zone. This parameter | |
605 | 1268 // is dependent on the depth of the maximum VM call stack possible from |
0 | 1269 // the handler for stack overflow. 'instanceof' in the stack overflow |
1270 // handler or a println uses at least 8k stack of VM and native code | |
1271 // respectively. | |
1272 const int framesize_in_bytes = | |
1273 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
1274 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
1275 * vm_page_size()) + framesize_in_bytes; | |
1276 // The very lower end of the stack | |
1277 address stack_limit = thread->stack_base() - thread->stack_size(); | |
1278 return (sp > (stack_limit + reserved_area)); | |
1279 } | |
1280 | |
1281 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
1282 uint min_pages) | |
1283 { | |
1284 assert(min_pages > 0, "sanity"); | |
1285 if (UseLargePages) { | |
1286 const size_t max_page_size = region_max_size / min_pages; | |
1287 | |
1288 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
1289 const size_t sz = _page_sizes[i]; | |
1290 const size_t mask = sz - 1; | |
1291 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
1292 // The largest page size with no fragmentation. | |
1293 return sz; | |
1294 } | |
1295 | |
1296 if (sz <= max_page_size) { | |
1297 // The largest page size that satisfies the min_pages requirement. | |
1298 return sz; | |
1299 } | |
1300 } | |
1301 } | |
1302 | |
1303 return vm_page_size(); | |
1304 } | |
1305 | |
1306 #ifndef PRODUCT | |
3859 | 1307 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) |
1308 { | |
1309 if (TracePageSizes) { | |
1310 tty->print("%s: ", str); | |
1311 for (int i = 0; i < count; ++i) { | |
1312 tty->print(" " SIZE_FORMAT, page_sizes[i]); | |
1313 } | |
1314 tty->cr(); | |
1315 } | |
1316 } | |
1317 | |
0 | 1318 void os::trace_page_sizes(const char* str, const size_t region_min_size, |
1319 const size_t region_max_size, const size_t page_size, | |
1320 const char* base, const size_t size) | |
1321 { | |
1322 if (TracePageSizes) { | |
1323 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
1324 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
1325 " size=" SIZE_FORMAT, | |
1326 str, region_min_size, region_max_size, | |
1327 page_size, base, size); | |
1328 } | |
1329 } | |
1330 #endif // #ifndef PRODUCT | |
1331 | |
1332 // This is the working definition of a server class machine: | |
1333 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
1334 // because the graphics memory (?) sometimes masks physical memory. | |
1335 // If you want to change the definition of a server class machine | |
1336 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
1337 // then you'll have to parameterize this method based on that state, | |
1338 // as was done for logical processors here, or replicate and | |
1339 // specialize this method for each platform. (Or fix os to have | |
1340 // some inheritance structure and use subclassing. Sigh.) | |
1341 // If you want some platform to always or never behave as a server | |
1342 // class machine, change the setting of AlwaysActAsServerClassMachine | |
1343 // and NeverActAsServerClassMachine in globals*.hpp. | |
1344 bool os::is_server_class_machine() { | |
1345 // First check for the early returns | |
1346 if (NeverActAsServerClassMachine) { | |
1347 return false; | |
1348 } | |
1349 if (AlwaysActAsServerClassMachine) { | |
1350 return true; | |
1351 } | |
1352 // Then actually look at the machine | |
1353 bool result = false; | |
1354 const unsigned int server_processors = 2; | |
1355 const julong server_memory = 2UL * G; | |
1356 // We seem not to get our full complement of memory. | |
1357 // We allow some part (1/8?) of the memory to be "missing", | |
1358 // based on the sizes of DIMMs, and maybe graphics cards. | |
1359 const julong missing_memory = 256UL * M; | |
1360 | |
1361 /* Is this a server class machine? */ | |
1362 if ((os::active_processor_count() >= (int)server_processors) && | |
1363 (os::physical_memory() >= (server_memory - missing_memory))) { | |
1364 const unsigned int logical_processors = | |
1365 VM_Version::logical_processors_per_package(); | |
1366 if (logical_processors > 1) { | |
1367 const unsigned int physical_packages = | |
1368 os::active_processor_count() / logical_processors; | |
1369 if (physical_packages > server_processors) { | |
1370 result = true; | |
1371 } | |
1372 } else { | |
1373 result = true; | |
1374 } | |
1375 } | |
1376 return result; | |
1377 } | |
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1378 |
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1379 // Read file line by line, if line is longer than bsize, |
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1380 // skip rest of line. |
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1381 int os::get_line_chars(int fd, char* buf, const size_t bsize){ |
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1382 size_t sz, i = 0; |
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1383 |
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1384 // read until EOF, EOL or buf is full |
3832 | 1385 while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-2) && buf[i] != '\n') { |
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1386 ++i; |
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1387 } |
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1388 |
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1389 if (buf[i] == '\n') { |
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1390 // EOL reached so ignore EOL character and return |
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1391 |
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1392 buf[i] = 0; |
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1393 return (int) i; |
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1394 } |
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1395 |
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1396 buf[i+1] = 0; |
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1397 |
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1398 if (sz != 1) { |
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1399 // EOF reached. if we read chars before EOF return them and |
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1400 // return EOF on next call otherwise return EOF |
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1401 |
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1402 return (i == 0) ? -1 : (int) i; |
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1403 } |
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1404 |
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1405 // line is longer than size of buf, skip to EOL |
3832 | 1406 char ch; |
2469
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1407 while (read(fd, &ch, 1) == 1 && ch != '\n') { |
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1408 // Do nothing |
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1409 } |
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1410 |
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1411 // return initial part of line that fits in buf. |
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1412 // If we reached EOF, it will be returned on next call. |
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1413 |
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1414 return (int) i; |
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1415 } |
6197 | 1416 |
1417 bool os::create_stack_guard_pages(char* addr, size_t bytes) { | |
1418 return os::pd_create_stack_guard_pages(addr, bytes); | |
1419 } | |
1420 | |
1421 | |
1422 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { | |
1423 char* result = pd_reserve_memory(bytes, addr, alignment_hint); | |
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1424 if (result != NULL) { |
6197 | 1425 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); |
1426 } | |
1427 | |
1428 return result; | |
1429 } | |
1430 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { | |
1431 char* result = pd_attempt_reserve_memory_at(bytes, addr); | |
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1432 if (result != NULL) { |
6197 | 1433 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); |
1434 } | |
1435 return result; | |
1436 } | |
1437 | |
1438 void os::split_reserved_memory(char *base, size_t size, | |
1439 size_t split, bool realloc) { | |
1440 pd_split_reserved_memory(base, size, split, realloc); | |
1441 } | |
1442 | |
1443 bool os::commit_memory(char* addr, size_t bytes, bool executable) { | |
1444 bool res = pd_commit_memory(addr, bytes, executable); | |
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1445 if (res) { |
6197 | 1446 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); |
1447 } | |
1448 return res; | |
1449 } | |
1450 | |
1451 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, | |
1452 bool executable) { | |
1453 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); | |
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1454 if (res) { |
6197 | 1455 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); |
1456 } | |
1457 return res; | |
1458 } | |
1459 | |
1460 bool os::uncommit_memory(char* addr, size_t bytes) { | |
1461 bool res = pd_uncommit_memory(addr, bytes); | |
1462 if (res) { | |
1463 MemTracker::record_virtual_memory_uncommit((address)addr, bytes); | |
1464 } | |
1465 return res; | |
1466 } | |
1467 | |
1468 bool os::release_memory(char* addr, size_t bytes) { | |
1469 bool res = pd_release_memory(addr, bytes); | |
1470 if (res) { | |
1471 MemTracker::record_virtual_memory_release((address)addr, bytes); | |
1472 } | |
1473 return res; | |
1474 } | |
1475 | |
1476 | |
1477 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
1478 char *addr, size_t bytes, bool read_only, | |
1479 bool allow_exec) { | |
1480 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); | |
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1481 if (result != NULL) { |
6197 | 1482 MemTracker::record_virtual_memory_reserve((address)result, bytes, CALLER_PC); |
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1483 MemTracker::record_virtual_memory_commit((address)result, bytes, CALLER_PC); |
6197 | 1484 } |
1485 return result; | |
1486 } | |
1487 | |
1488 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
1489 char *addr, size_t bytes, bool read_only, | |
1490 bool allow_exec) { | |
1491 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, | |
1492 read_only, allow_exec); | |
1493 } | |
1494 | |
1495 bool os::unmap_memory(char *addr, size_t bytes) { | |
1496 bool result = pd_unmap_memory(addr, bytes); | |
1497 if (result) { | |
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1498 MemTracker::record_virtual_memory_uncommit((address)addr, bytes); |
6197 | 1499 MemTracker::record_virtual_memory_release((address)addr, bytes); |
1500 } | |
1501 return result; | |
1502 } | |
1503 | |
1504 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1505 pd_free_memory(addr, bytes, alignment_hint); | |
1506 } | |
1507 | |
1508 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1509 pd_realign_memory(addr, bytes, alignment_hint); | |
1510 } | |
1511 |