Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 17381:40dce17629ac
correct IfNode probabilities in If-Deopt situations
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Wed, 08 Oct 2014 10:49:53 +0200 |
parents | 6adb14d2320c |
children | 89152779163c |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 static juint cur_malloc_words = 0; // current size for MallocMaxTestWords |
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84 |
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85 void os_init_globals() { |
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86 // Called from init_globals(). |
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87 // See Threads::create_vm() in thread.cpp, and init.cpp. |
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88 os::init_globals(); |
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89 } |
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90 |
0 | 91 // Fill in buffer with current local time as an ISO-8601 string. |
92 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
93 // Returns buffer, or NULL if it failed. | |
94 // This would mostly be a call to | |
95 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
96 // except that on Windows the %z behaves badly, so we do it ourselves. | |
97 // Also, people wanted milliseconds on there, | |
98 // and strftime doesn't do milliseconds. | |
99 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
100 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
101 // 1 2 | |
102 // 12345678901234567890123456789 | |
103 static const char* iso8601_format = | |
104 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
105 static const size_t needed_buffer = 29; | |
106 | |
107 // Sanity check the arguments | |
108 if (buffer == NULL) { | |
109 assert(false, "NULL buffer"); | |
110 return NULL; | |
111 } | |
112 if (buffer_length < needed_buffer) { | |
113 assert(false, "buffer_length too small"); | |
114 return NULL; | |
115 } | |
116 // Get the current time | |
61 | 117 jlong milliseconds_since_19700101 = javaTimeMillis(); |
0 | 118 const int milliseconds_per_microsecond = 1000; |
119 const time_t seconds_since_19700101 = | |
120 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
121 const int milliseconds_after_second = | |
122 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
123 // Convert the time value to a tm and timezone variable | |
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124 struct tm time_struct; |
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125 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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126 assert(false, "Failed localtime_pd"); |
0 | 127 return NULL; |
128 } | |
3960 | 129 #if defined(_ALLBSD_SOURCE) |
130 const time_t zone = (time_t) time_struct.tm_gmtoff; | |
131 #else | |
0 | 132 const time_t zone = timezone; |
3960 | 133 #endif |
0 | 134 |
135 // If daylight savings time is in effect, | |
136 // we are 1 hour East of our time zone | |
137 const time_t seconds_per_minute = 60; | |
138 const time_t minutes_per_hour = 60; | |
139 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
140 time_t UTC_to_local = zone; | |
141 if (time_struct.tm_isdst > 0) { | |
142 UTC_to_local = UTC_to_local - seconds_per_hour; | |
143 } | |
144 // Compute the time zone offset. | |
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145 // localtime_pd() sets timezone to the difference (in seconds) |
0 | 146 // between UTC and and local time. |
147 // ISO 8601 says we need the difference between local time and UTC, | |
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148 // we change the sign of the localtime_pd() result. |
0 | 149 const time_t local_to_UTC = -(UTC_to_local); |
150 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
151 char sign_local_to_UTC = '+'; | |
152 time_t abs_local_to_UTC = local_to_UTC; | |
153 if (local_to_UTC < 0) { | |
154 sign_local_to_UTC = '-'; | |
155 abs_local_to_UTC = -(abs_local_to_UTC); | |
156 } | |
157 // Convert time zone offset seconds to hours and minutes. | |
158 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
159 const time_t zone_min = | |
160 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
161 | |
162 // Print an ISO 8601 date and time stamp into the buffer | |
163 const int year = 1900 + time_struct.tm_year; | |
164 const int month = 1 + time_struct.tm_mon; | |
165 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
166 year, | |
167 month, | |
168 time_struct.tm_mday, | |
169 time_struct.tm_hour, | |
170 time_struct.tm_min, | |
171 time_struct.tm_sec, | |
172 milliseconds_after_second, | |
173 sign_local_to_UTC, | |
174 zone_hours, | |
175 zone_min); | |
176 if (printed == 0) { | |
177 assert(false, "Failed jio_printf"); | |
178 return NULL; | |
179 } | |
180 return buffer; | |
181 } | |
182 | |
183 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
184 #ifdef ASSERT | |
185 if (!(!thread->is_Java_thread() || | |
186 Thread::current() == thread || | |
187 Threads_lock->owned_by_self() | |
188 || thread->is_Compiler_thread() | |
189 )) { | |
190 assert(false, "possibility of dangling Thread pointer"); | |
191 } | |
192 #endif | |
193 | |
194 if (p >= MinPriority && p <= MaxPriority) { | |
195 int priority = java_to_os_priority[p]; | |
196 return set_native_priority(thread, priority); | |
197 } else { | |
198 assert(false, "Should not happen"); | |
199 return OS_ERR; | |
200 } | |
201 } | |
202 | |
6766 | 203 // The mapping from OS priority back to Java priority may be inexact because |
204 // Java priorities can map M:1 with native priorities. If you want the definite | |
205 // Java priority then use JavaThread::java_priority() | |
0 | 206 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { |
207 int p; | |
208 int os_prio; | |
209 OSReturn ret = get_native_priority(thread, &os_prio); | |
210 if (ret != OS_OK) return ret; | |
211 | |
6766 | 212 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { |
213 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
214 } else { | |
215 // niceness values are in reverse order | |
216 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; | |
217 } | |
0 | 218 priority = (ThreadPriority)p; |
219 return OS_OK; | |
220 } | |
221 | |
222 | |
223 // --------------------- sun.misc.Signal (optional) --------------------- | |
224 | |
225 | |
226 // SIGBREAK is sent by the keyboard to query the VM state | |
227 #ifndef SIGBREAK | |
228 #define SIGBREAK SIGQUIT | |
229 #endif | |
230 | |
231 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
232 | |
233 | |
234 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
235 os::set_priority(thread, NearMaxPriority); | |
236 while (true) { | |
237 int sig; | |
238 { | |
14909 | 239 // FIXME : Currently we have not decieded what should be the status |
0 | 240 // for this java thread blocked here. Once we decide about |
241 // that we should fix this. | |
242 sig = os::signal_wait(); | |
243 } | |
244 if (sig == os::sigexitnum_pd()) { | |
245 // Terminate the signal thread | |
246 return; | |
247 } | |
248 | |
249 switch (sig) { | |
250 case SIGBREAK: { | |
251 // Check if the signal is a trigger to start the Attach Listener - in that | |
252 // case don't print stack traces. | |
253 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
254 continue; | |
255 } | |
256 // Print stack traces | |
257 // Any SIGBREAK operations added here should make sure to flush | |
258 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
259 // Each module also prints an extra carriage return after its output. | |
260 VM_PrintThreads op; | |
261 VMThread::execute(&op); | |
262 VM_PrintJNI jni_op; | |
263 VMThread::execute(&jni_op); | |
264 VM_FindDeadlocks op1(tty); | |
265 VMThread::execute(&op1); | |
266 Universe::print_heap_at_SIGBREAK(); | |
267 if (PrintClassHistogram) { | |
10405 | 268 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */); |
0 | 269 VMThread::execute(&op1); |
270 } | |
271 if (JvmtiExport::should_post_data_dump()) { | |
272 JvmtiExport::post_data_dump(); | |
273 } | |
274 break; | |
275 } | |
276 default: { | |
277 // Dispatch the signal to java | |
278 HandleMark hm(THREAD); | |
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279 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
0 | 280 KlassHandle klass (THREAD, k); |
281 if (klass.not_null()) { | |
282 JavaValue result(T_VOID); | |
283 JavaCallArguments args; | |
284 args.push_int(sig); | |
285 JavaCalls::call_static( | |
286 &result, | |
287 klass, | |
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288 vmSymbols::dispatch_name(), |
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289 vmSymbols::int_void_signature(), |
0 | 290 &args, |
291 THREAD | |
292 ); | |
293 } | |
294 if (HAS_PENDING_EXCEPTION) { | |
295 // tty is initialized early so we don't expect it to be null, but | |
296 // if it is we can't risk doing an initialization that might | |
297 // trigger additional out-of-memory conditions | |
298 if (tty != NULL) { | |
299 char klass_name[256]; | |
300 char tmp_sig_name[16]; | |
301 const char* sig_name = "UNKNOWN"; | |
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302 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> |
0 | 303 name()->as_klass_external_name(klass_name, 256); |
304 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
305 sig_name = tmp_sig_name; | |
306 warning("Exception %s occurred dispatching signal %s to handler" | |
307 "- the VM may need to be forcibly terminated", | |
308 klass_name, sig_name ); | |
309 } | |
310 CLEAR_PENDING_EXCEPTION; | |
311 } | |
312 } | |
313 } | |
314 } | |
315 } | |
316 | |
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317 void os::init_before_ergo() { |
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318 // We need to initialize large page support here because ergonomics takes some |
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319 // decisions depending on large page support and the calculated large page size. |
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320 large_page_init(); |
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321 } |
0 | 322 |
323 void os::signal_init() { | |
324 if (!ReduceSignalUsage) { | |
325 // Setup JavaThread for processing signals | |
326 EXCEPTION_MARK; | |
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327 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 328 instanceKlassHandle klass (THREAD, k); |
329 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
330 | |
331 const char thread_name[] = "Signal Dispatcher"; | |
332 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
333 | |
334 // Initialize thread_oop to put it into the system threadGroup | |
335 Handle thread_group (THREAD, Universe::system_thread_group()); | |
336 JavaValue result(T_VOID); | |
337 JavaCalls::call_special(&result, thread_oop, | |
338 klass, | |
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339 vmSymbols::object_initializer_name(), |
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340 vmSymbols::threadgroup_string_void_signature(), |
0 | 341 thread_group, |
342 string, | |
343 CHECK); | |
344 | |
1142 | 345 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 346 JavaCalls::call_special(&result, |
347 thread_group, | |
348 group, | |
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349 vmSymbols::add_method_name(), |
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350 vmSymbols::thread_void_signature(), |
0 | 351 thread_oop, // ARG 1 |
352 CHECK); | |
353 | |
354 os::signal_init_pd(); | |
355 | |
356 { MutexLocker mu(Threads_lock); | |
357 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
358 | |
359 // At this point it may be possible that no osthread was created for the | |
360 // JavaThread due to lack of memory. We would have to throw an exception | |
361 // in that case. However, since this must work and we do not allow | |
362 // exceptions anyway, check and abort if this fails. | |
363 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
364 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
14909 | 365 "unable to create new native thread"); |
0 | 366 } |
367 | |
368 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
369 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
370 java_lang_Thread::set_daemon(thread_oop()); | |
371 | |
372 signal_thread->set_threadObj(thread_oop()); | |
373 Threads::add(signal_thread); | |
374 Thread::start(signal_thread); | |
375 } | |
376 // Handle ^BREAK | |
377 os::signal(SIGBREAK, os::user_handler()); | |
378 } | |
379 } | |
380 | |
381 | |
382 void os::terminate_signal_thread() { | |
383 if (!ReduceSignalUsage) | |
384 signal_notify(sigexitnum_pd()); | |
385 } | |
386 | |
387 | |
388 // --------------------- loading libraries --------------------- | |
389 | |
390 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
391 extern struct JavaVM_ main_vm; | |
392 | |
393 static void* _native_java_library = NULL; | |
394 | |
395 void* os::native_java_library() { | |
396 if (_native_java_library == NULL) { | |
397 char buffer[JVM_MAXPATHLEN]; | |
398 char ebuf[1024]; | |
399 | |
242 | 400 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
401 // always able to find it when the loading executable is outside the JDK. | |
0 | 402 // In order to keep working with 1.2 we ignore any loading errors. |
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403 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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404 "verify")) { |
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405 dll_load(buffer, ebuf, sizeof(ebuf)); |
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406 } |
0 | 407 |
408 // Load java dll | |
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409 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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410 "java")) { |
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411 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); |
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412 } |
0 | 413 if (_native_java_library == NULL) { |
414 vm_exit_during_initialization("Unable to load native library", ebuf); | |
415 } | |
3960 | 416 |
417 #if defined(__OpenBSD__) | |
418 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so | |
419 // ignore errors | |
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420 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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421 "net")) { |
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422 dll_load(buffer, ebuf, sizeof(ebuf)); |
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423 } |
3960 | 424 #endif |
242 | 425 } |
426 static jboolean onLoaded = JNI_FALSE; | |
427 if (onLoaded) { | |
428 // We may have to wait to fire OnLoad until TLS is initialized. | |
429 if (ThreadLocalStorage::is_initialized()) { | |
430 // The JNI_OnLoad handling is normally done by method load in | |
431 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
432 // explicitly so we have to check for JNI_OnLoad as well | |
433 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
434 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
435 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
436 if (JNI_OnLoad != NULL) { | |
437 JavaThread* thread = JavaThread::current(); | |
438 ThreadToNativeFromVM ttn(thread); | |
439 HandleMark hm(thread); | |
440 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
441 onLoaded = JNI_TRUE; | |
442 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
443 vm_exit_during_initialization("Unsupported JNI version"); | |
444 } | |
0 | 445 } |
446 } | |
447 } | |
448 return _native_java_library; | |
449 } | |
450 | |
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451 /* |
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452 * Support for finding Agent_On(Un)Load/Attach<_lib_name> if it exists. |
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453 * If check_lib == true then we are looking for an |
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454 * Agent_OnLoad_lib_name or Agent_OnAttach_lib_name function to determine if |
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455 * this library is statically linked into the image. |
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456 * If check_lib == false then we will look for the appropriate symbol in the |
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457 * executable if agent_lib->is_static_lib() == true or in the shared library |
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458 * referenced by 'handle'. |
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459 */ |
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460 void* os::find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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461 const char *syms[], size_t syms_len) { |
12220 | 462 assert(agent_lib != NULL, "sanity check"); |
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463 const char *lib_name; |
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464 void *handle = agent_lib->os_lib(); |
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465 void *entryName = NULL; |
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466 char *agent_function_name; |
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467 size_t i; |
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468 |
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469 // If checking then use the agent name otherwise test is_static_lib() to |
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470 // see how to process this lookup |
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471 lib_name = ((check_lib || agent_lib->is_static_lib()) ? agent_lib->name() : NULL); |
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472 for (i = 0; i < syms_len; i++) { |
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473 agent_function_name = build_agent_function_name(syms[i], lib_name, agent_lib->is_absolute_path()); |
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474 if (agent_function_name == NULL) { |
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475 break; |
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476 } |
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477 entryName = dll_lookup(handle, agent_function_name); |
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478 FREE_C_HEAP_ARRAY(char, agent_function_name, mtThread); |
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479 if (entryName != NULL) { |
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480 break; |
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481 } |
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482 } |
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483 return entryName; |
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484 } |
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485 |
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486 // See if the passed in agent is statically linked into the VM image. |
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487 bool os::find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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488 size_t syms_len) { |
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489 void *ret; |
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490 void *proc_handle; |
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491 void *save_handle; |
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492 |
12220 | 493 assert(agent_lib != NULL, "sanity check"); |
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494 if (agent_lib->name() == NULL) { |
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495 return false; |
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496 } |
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497 proc_handle = get_default_process_handle(); |
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498 // Check for Agent_OnLoad/Attach_lib_name function |
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499 save_handle = agent_lib->os_lib(); |
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500 // We want to look in this process' symbol table. |
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501 agent_lib->set_os_lib(proc_handle); |
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502 ret = find_agent_function(agent_lib, true, syms, syms_len); |
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503 if (ret != NULL) { |
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504 // Found an entry point like Agent_OnLoad_lib_name so we have a static agent |
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505 agent_lib->set_valid(); |
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506 agent_lib->set_static_lib(true); |
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507 return true; |
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508 } |
12220 | 509 agent_lib->set_os_lib(save_handle); |
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510 return false; |
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511 } |
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512 |
0 | 513 // --------------------- heap allocation utilities --------------------- |
514 | |
6197 | 515 char *os::strdup(const char *str, MEMFLAGS flags) { |
0 | 516 size_t size = strlen(str); |
6197 | 517 char *dup_str = (char *)malloc(size + 1, flags); |
0 | 518 if (dup_str == NULL) return NULL; |
519 strcpy(dup_str, str); | |
520 return dup_str; | |
521 } | |
522 | |
523 | |
524 | |
525 #ifdef ASSERT | |
526 #define space_before (MallocCushion + sizeof(double)) | |
527 #define space_after MallocCushion | |
528 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
529 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
530 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
531 // NB: cannot be debug variable, because these aren't set from the command line until | |
532 // *after* the first few allocs already happened | |
533 #define MallocCushion 16 | |
534 #else | |
535 #define space_before 0 | |
536 #define space_after 0 | |
537 #define size_addr_from_base(p) should not use w/o ASSERT | |
538 #define size_addr_from_obj(p) should not use w/o ASSERT | |
539 #define MallocCushion 0 | |
540 #endif | |
541 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
542 | |
543 #ifdef ASSERT | |
544 inline size_t get_size(void* obj) { | |
545 size_t size = *size_addr_from_obj(obj); | |
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546 if (size < 0) { |
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547 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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548 SIZE_FORMAT ")", obj, size)); |
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549 } |
0 | 550 return size; |
551 } | |
552 | |
553 u_char* find_cushion_backwards(u_char* start) { | |
554 u_char* p = start; | |
555 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
556 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
557 // ok, we have four consecutive marker bytes; find start | |
558 u_char* q = p - 4; | |
559 while (*q == badResourceValue) q--; | |
560 return q + 1; | |
561 } | |
562 | |
563 u_char* find_cushion_forwards(u_char* start) { | |
564 u_char* p = start; | |
565 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
566 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
567 // ok, we have four consecutive marker bytes; find end of cushion | |
568 u_char* q = p + 4; | |
569 while (*q == badResourceValue) q++; | |
570 return q - MallocCushion; | |
571 } | |
572 | |
573 void print_neighbor_blocks(void* ptr) { | |
574 // find block allocated before ptr (not entirely crash-proof) | |
575 if (MallocCushion < 4) { | |
576 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
577 return; | |
578 } | |
579 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
580 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
581 // look for cushion in front of prev. block | |
582 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
583 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
584 u_char* obj = start_of_prev_block + space_before; | |
585 if (size <= 0 ) { | |
14909 | 586 // start is bad; mayhave been confused by OS data inbetween objects |
0 | 587 // search one more backwards |
588 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
589 size = *size_addr_from_base(start_of_prev_block); | |
590 obj = start_of_prev_block + space_before; | |
591 } | |
592 | |
593 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
2250 | 594 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 595 } else { |
2250 | 596 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
0 | 597 } |
598 | |
599 // now find successor block | |
600 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
601 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
602 u_char* next_obj = start_of_next_block + space_before; | |
603 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
604 if (start_of_next_block[0] == badResourceValue && | |
605 start_of_next_block[1] == badResourceValue && | |
606 start_of_next_block[2] == badResourceValue && | |
607 start_of_next_block[3] == badResourceValue) { | |
2250 | 608 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 609 } else { |
2250 | 610 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
0 | 611 } |
612 } | |
613 | |
614 | |
615 void report_heap_error(void* memblock, void* bad, const char* where) { | |
2250 | 616 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
617 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
0 | 618 print_neighbor_blocks(memblock); |
619 fatal("memory stomping error"); | |
620 } | |
621 | |
622 void verify_block(void* memblock) { | |
623 size_t size = get_size(memblock); | |
624 if (MallocCushion) { | |
625 u_char* ptr = (u_char*)memblock - space_before; | |
626 for (int i = 0; i < MallocCushion; i++) { | |
627 if (ptr[i] != badResourceValue) { | |
628 report_heap_error(memblock, ptr+i, "in front of"); | |
629 } | |
630 } | |
631 u_char* end = (u_char*)memblock + size + space_after; | |
632 for (int j = -MallocCushion; j < 0; j++) { | |
633 if (end[j] != badResourceValue) { | |
634 report_heap_error(memblock, end+j, "after"); | |
635 } | |
636 } | |
637 } | |
638 } | |
639 #endif | |
640 | |
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641 // |
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642 // This function supports testing of the malloc out of memory |
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643 // condition without really running the system out of memory. |
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644 // |
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645 static u_char* testMalloc(size_t alloc_size) { |
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646 assert(MallocMaxTestWords > 0, "sanity check"); |
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647 |
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648 if ((cur_malloc_words + (alloc_size / BytesPerWord)) > MallocMaxTestWords) { |
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649 return NULL; |
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650 } |
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651 |
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652 u_char* ptr = (u_char*)::malloc(alloc_size); |
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653 |
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654 if (ptr != NULL) { |
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655 Atomic::add(((jint) (alloc_size / BytesPerWord)), |
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656 (volatile jint *) &cur_malloc_words); |
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657 } |
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658 return ptr; |
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659 } |
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660 |
6197 | 661 void* os::malloc(size_t size, MEMFLAGS memflags, address caller) { |
2250 | 662 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
663 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
0 | 664 |
11151 | 665 #ifdef ASSERT |
666 // checking for the WatcherThread and crash_protection first | |
667 // since os::malloc can be called when the libjvm.{dll,so} is | |
668 // first loaded and we don't have a thread yet. | |
669 // try to find the thread after we see that the watcher thread | |
670 // exists and has crash protection. | |
671 WatcherThread *wt = WatcherThread::watcher_thread(); | |
672 if (wt != NULL && wt->has_crash_protection()) { | |
673 Thread* thread = ThreadLocalStorage::get_thread_slow(); | |
674 if (thread == wt) { | |
675 assert(!wt->has_crash_protection(), | |
676 "Can't malloc with crash protection from WatcherThread"); | |
677 } | |
678 } | |
679 #endif | |
680 | |
0 | 681 if (size == 0) { |
682 // return a valid pointer if size is zero | |
683 // if NULL is returned the calling functions assume out of memory. | |
684 size = 1; | |
685 } | |
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686 |
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687 const size_t alloc_size = size + space_before + space_after; |
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688 |
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689 if (size > alloc_size) { // Check for rollover. |
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690 return NULL; |
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691 } |
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692 |
0 | 693 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); |
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694 |
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695 u_char* ptr; |
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696 |
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697 if (MallocMaxTestWords > 0) { |
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698 ptr = testMalloc(alloc_size); |
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699 } else { |
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700 ptr = (u_char*)::malloc(alloc_size); |
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701 } |
6197 | 702 |
0 | 703 #ifdef ASSERT |
704 if (ptr == NULL) return NULL; | |
705 if (MallocCushion) { | |
706 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
707 u_char* end = ptr + space_before + size; | |
708 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
709 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
710 } | |
711 // put size just before data | |
712 *size_addr_from_base(ptr) = size; | |
713 #endif | |
714 u_char* memblock = ptr + space_before; | |
715 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 716 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
0 | 717 breakpoint(); |
718 } | |
719 debug_only(if (paranoid) verify_block(memblock)); | |
2250 | 720 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
6197 | 721 |
722 // we do not track MallocCushion memory | |
723 MemTracker::record_malloc((address)memblock, size, memflags, caller == 0 ? CALLER_PC : caller); | |
724 | |
0 | 725 return memblock; |
726 } | |
727 | |
728 | |
6197 | 729 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, address caller) { |
0 | 730 #ifndef ASSERT |
2250 | 731 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
732 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
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733 MemTracker::Tracker tkr = MemTracker::get_realloc_tracker(); |
6197 | 734 void* ptr = ::realloc(memblock, size); |
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735 if (ptr != NULL) { |
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736 tkr.record((address)memblock, (address)ptr, size, memflags, |
6197 | 737 caller == 0 ? CALLER_PC : caller); |
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738 } else { |
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739 tkr.discard(); |
6197 | 740 } |
741 return ptr; | |
0 | 742 #else |
743 if (memblock == NULL) { | |
6197 | 744 return malloc(size, memflags, (caller == 0 ? CALLER_PC : caller)); |
0 | 745 } |
746 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 747 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
0 | 748 breakpoint(); |
749 } | |
750 verify_block(memblock); | |
751 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
752 if (size == 0) return NULL; | |
753 // always move the block | |
6197 | 754 void* ptr = malloc(size, memflags, caller == 0 ? CALLER_PC : caller); |
2250 | 755 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
0 | 756 // Copy to new memory if malloc didn't fail |
757 if ( ptr != NULL ) { | |
758 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
759 if (paranoid) verify_block(ptr); | |
760 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
2250 | 761 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
0 | 762 breakpoint(); |
763 } | |
764 free(memblock); | |
765 } | |
766 return ptr; | |
767 #endif | |
768 } | |
769 | |
770 | |
6197 | 771 void os::free(void *memblock, MEMFLAGS memflags) { |
2250 | 772 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
0 | 773 #ifdef ASSERT |
774 if (memblock == NULL) return; | |
775 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
2250 | 776 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
0 | 777 breakpoint(); |
778 } | |
779 verify_block(memblock); | |
780 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
781 // Added by detlefs. | |
782 if (MallocCushion) { | |
783 u_char* ptr = (u_char*)memblock - space_before; | |
784 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
785 guarantee(*p == badResourceValue, | |
786 "Thing freed should be malloc result."); | |
787 *p = (u_char)freeBlockPad; | |
788 } | |
789 size_t size = get_size(memblock); | |
2250 | 790 inc_stat_counter(&free_bytes, size); |
0 | 791 u_char* end = ptr + space_before + size; |
792 for (u_char* q = end; q < end + MallocCushion; q++) { | |
793 guarantee(*q == badResourceValue, | |
794 "Thing freed should be malloc result."); | |
795 *q = (u_char)freeBlockPad; | |
796 } | |
2250 | 797 if (PrintMalloc && tty != NULL) |
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798 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
2250 | 799 } else if (PrintMalloc && tty != NULL) { |
800 // tty->print_cr("os::free %p", memblock); | |
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801 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
0 | 802 } |
803 #endif | |
6197 | 804 MemTracker::record_free((address)memblock, memflags); |
805 | |
0 | 806 ::free((char*)memblock - space_before); |
807 } | |
808 | |
809 void os::init_random(long initval) { | |
810 _rand_seed = initval; | |
811 } | |
812 | |
813 | |
814 long os::random() { | |
815 /* standard, well-known linear congruential random generator with | |
816 * next_rand = (16807*seed) mod (2**31-1) | |
817 * see | |
818 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
819 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
820 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
821 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
822 */ | |
823 const long a = 16807; | |
824 const unsigned long m = 2147483647; | |
825 const long q = m / a; assert(q == 127773, "weird math"); | |
826 const long r = m % a; assert(r == 2836, "weird math"); | |
827 | |
828 // compute az=2^31p+q | |
829 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
830 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
831 lo += (hi & 0x7FFF) << 16; | |
832 | |
833 // if q overflowed, ignore the overflow and increment q | |
834 if (lo > m) { | |
835 lo &= m; | |
836 ++lo; | |
837 } | |
838 lo += hi >> 15; | |
839 | |
840 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
841 if (lo > m) { | |
842 lo &= m; | |
843 ++lo; | |
844 } | |
845 return (_rand_seed = lo); | |
846 } | |
847 | |
848 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
849 // conditions in which a thread is first started are different from those in which | |
850 // a suspension is resumed. These differences make it hard for us to apply the | |
851 // tougher checks when starting threads that we want to do when resuming them. | |
852 // However, when start_thread is called as a result of Thread.start, on a Java | |
853 // thread, the operation is synchronized on the Java Thread object. So there | |
854 // cannot be a race to start the thread and hence for the thread to exit while | |
855 // we are working on it. Non-Java threads that start Java threads either have | |
856 // to do so in a context in which races are impossible, or should do appropriate | |
857 // locking. | |
858 | |
859 void os::start_thread(Thread* thread) { | |
860 // guard suspend/resume | |
861 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
862 OSThread* osthread = thread->osthread(); | |
863 osthread->set_state(RUNNABLE); | |
864 pd_start_thread(thread); | |
865 } | |
866 | |
867 //--------------------------------------------------------------------------- | |
868 // Helper functions for fatal error handler | |
869 | |
870 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
871 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
872 | |
873 int cols = 0; | |
874 int cols_per_line = 0; | |
875 switch (unitsize) { | |
876 case 1: cols_per_line = 16; break; | |
877 case 2: cols_per_line = 8; break; | |
878 case 4: cols_per_line = 4; break; | |
879 case 8: cols_per_line = 2; break; | |
880 default: return; | |
881 } | |
882 | |
883 address p = start; | |
884 st->print(PTR_FORMAT ": ", start); | |
885 while (p < end) { | |
886 switch (unitsize) { | |
887 case 1: st->print("%02x", *(u1*)p); break; | |
888 case 2: st->print("%04x", *(u2*)p); break; | |
889 case 4: st->print("%08x", *(u4*)p); break; | |
890 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
891 } | |
892 p += unitsize; | |
893 cols++; | |
894 if (cols >= cols_per_line && p < end) { | |
895 cols = 0; | |
896 st->cr(); | |
897 st->print(PTR_FORMAT ": ", p); | |
898 } else { | |
899 st->print(" "); | |
900 } | |
901 } | |
902 st->cr(); | |
903 } | |
904 | |
905 void os::print_environment_variables(outputStream* st, const char** env_list, | |
906 char* buffer, int len) { | |
907 if (env_list) { | |
908 st->print_cr("Environment Variables:"); | |
909 | |
910 for (int i = 0; env_list[i] != NULL; i++) { | |
911 if (getenv(env_list[i], buffer, len)) { | |
912 st->print(env_list[i]); | |
913 st->print("="); | |
914 st->print_cr(buffer); | |
915 } | |
916 } | |
917 } | |
918 } | |
919 | |
920 void os::print_cpu_info(outputStream* st) { | |
921 // cpu | |
922 st->print("CPU:"); | |
923 st->print("total %d", os::processor_count()); | |
924 // It's not safe to query number of active processors after crash | |
925 // st->print("(active %d)", os::active_processor_count()); | |
926 st->print(" %s", VM_Version::cpu_features()); | |
927 st->cr(); | |
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928 pd_print_cpu_info(st); |
0 | 929 } |
930 | |
931 void os::print_date_and_time(outputStream *st) { | |
932 time_t tloc; | |
933 (void)time(&tloc); | |
934 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
935 | |
936 double t = os::elapsedTime(); | |
937 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
938 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
939 // before printf. We lost some precision, but who cares? | |
940 st->print_cr("elapsed time: %d seconds", (int)t); | |
941 } | |
942 | |
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943 // moved from debug.cpp (used to be find()) but still called from there |
1907 | 944 // The verbose parameter is only set by the debug code in one case |
945 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
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946 address addr = (address)x; |
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947 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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948 if (b != NULL) { |
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949 if (b->is_buffer_blob()) { |
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950 // the interpreter is generated into a buffer blob |
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951 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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952 if (i != NULL) { |
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953 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); |
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954 i->print_on(st); |
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955 return; |
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956 } |
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957 if (Interpreter::contains(addr)) { |
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958 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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959 " (not bytecode specific)", addr); |
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960 return; |
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961 } |
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962 // |
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963 if (AdapterHandlerLibrary::contains(b)) { |
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964 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); |
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965 AdapterHandlerLibrary::print_handler_on(st, b); |
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966 } |
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967 // the stubroutines are generated into a buffer blob |
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968 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
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969 if (d != NULL) { |
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970 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); |
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971 d->print_on(st); |
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972 st->cr(); |
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973 return; |
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974 } |
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6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
975 if (StubRoutines::contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
976 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
977 "stub routine", addr); |
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 // the InlineCacheBuffer is using stubs generated into a buffer blob |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
981 if (InlineCacheBuffer::contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
982 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
983 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
984 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
985 VtableStub* v = VtableStubs::stub_containing(addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
986 if (v != NULL) { |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
987 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
|
988 v->print_on(st); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
989 st->cr(); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
990 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
991 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
992 } |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
993 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
|
994 if (nm != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
995 ResourceMark rm; |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
996 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
|
997 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
|
998 if (verbose) { |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
999 st->print(" for "); |
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
1000 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
|
1001 } |
6816
87ac5c0a404d
8000228: Missing call to cr() when printing entry_point in nmethod, in os::print_location
stefank
parents:
6814
diff
changeset
|
1002 st->cr(); |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
1003 nm->print_nmethod(verbose); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1004 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1005 } |
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
1006 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
|
1007 b->print_on(st); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1008 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1009 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1010 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1011 if (Universe::heap()->is_in(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1012 HeapWord* p = Universe::heap()->block_start(addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1013 bool print = false; |
14909 | 1014 // If we couldn't find it it just may mean that heap wasn't parseable |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1015 // See if we were just given an oop directly |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1016 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1017 print = true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1018 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1019 p = (HeapWord*) addr; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1020 print = true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1021 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1022 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
|
1023 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
|
1024 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
|
1025 } else { |
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
1026 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
|
1027 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1028 oop(p)->print_on(st); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1029 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1030 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1031 } else { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1032 if (Universe::heap()->is_in_reserved(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1033 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1034 "in the heap", addr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1035 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1036 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1037 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1038 if (JNIHandles::is_global_handle((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1039 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
|
1040 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1041 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1042 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1043 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
|
1044 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1045 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1046 #ifndef PRODUCT |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1047 // we don't keep the block list in product mode |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1048 if (JNIHandleBlock::any_contains((jobject) addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1049 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
|
1050 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1051 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1052 #endif |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1053 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1054 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1055 // Check for privilege stack |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1056 if (thread->privileged_stack_top() != NULL && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1057 thread->privileged_stack_top()->contains(addr)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1058 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
|
1059 "for thread: " INTPTR_FORMAT, addr, thread); |
1907 | 1060 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1061 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1062 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1063 // 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
|
1064 if (addr == (address)thread) { |
1907 | 1065 if (verbose) { |
1066 thread->print_on(st); | |
1067 } else { | |
1068 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
1069 } | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1070 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1071 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1072 // 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
|
1073 // and print thread info |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1074 if (thread->stack_base() >= addr && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1075 addr > (thread->stack_base() - thread->stack_size())) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1076 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
|
1077 INTPTR_FORMAT, addr, thread); |
1907 | 1078 if (verbose) thread->print_on(st); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1079 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1080 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1081 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1082 } |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1083 |
14909 | 1084 #ifndef PRODUCT |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1085 // Check if in metaspace. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1086 if (ClassLoaderDataGraph::contains((address)addr)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1087 // 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
|
1088 st->print_cr(INTPTR_FORMAT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1089 " is pointing into metadata", addr); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1090 return; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1091 } |
14909 | 1092 #endif |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6266
diff
changeset
|
1093 |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1094 // Try an OS specific find |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1095 if (os::find(addr, st)) { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1096 return; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1097 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
1098 |
1907 | 1099 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
|
1100 } |
0 | 1101 |
1102 // Looks like all platforms except IA64 can use the same function to check | |
1103 // if C stack is walkable beyond current frame. The check for fp() is not | |
1104 // necessary on Sparc, but it's harmless. | |
1105 bool os::is_first_C_frame(frame* fr) { | |
14909 | 1106 #if defined(IA64) && !defined(_WIN32) |
7994 | 1107 // On IA64 we have to check if the callers bsp is still valid |
1108 // (i.e. within the register stack bounds). | |
1109 // Notice: this only works for threads created by the VM and only if | |
1110 // we walk the current stack!!! If we want to be able to walk | |
1111 // arbitrary other threads, we'll have to somehow store the thread | |
1112 // object in the frame. | |
1113 Thread *thread = Thread::current(); | |
1114 if ((address)fr->fp() <= | |
1115 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { | |
1116 // This check is a little hacky, because on Linux the first C | |
1117 // frame's ('start_thread') register stack frame starts at | |
1118 // "register_stack_base + 0x48" while on HPUX, the first C frame's | |
1119 // ('__pthread_bound_body') register stack frame seems to really | |
1120 // start at "register_stack_base". | |
1121 return true; | |
1122 } else { | |
1123 return false; | |
1124 } | |
1125 #elif defined(IA64) && defined(_WIN32) | |
0 | 1126 return true; |
7994 | 1127 #else |
0 | 1128 // Load up sp, fp, sender sp and sender fp, check for reasonable values. |
1129 // Check usp first, because if that's bad the other accessors may fault | |
1130 // on some architectures. Ditto ufp second, etc. | |
1131 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
1132 // sp on amd can be 32 bit aligned. | |
1133 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
1134 | |
1135 uintptr_t usp = (uintptr_t)fr->sp(); | |
1136 if ((usp & sp_align_mask) != 0) return true; | |
1137 | |
1138 uintptr_t ufp = (uintptr_t)fr->fp(); | |
1139 if ((ufp & fp_align_mask) != 0) return true; | |
1140 | |
1141 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
1142 if ((old_sp & sp_align_mask) != 0) return true; | |
1143 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
1144 | |
1145 uintptr_t old_fp = (uintptr_t)fr->link(); | |
1146 if ((old_fp & fp_align_mask) != 0) return true; | |
1147 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
1148 | |
1149 // stack grows downwards; if old_fp is below current fp or if the stack | |
1150 // frame is too large, either the stack is corrupted or fp is not saved | |
1151 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
1152 // is not walkable beyond current frame. | |
1153 if (old_fp < ufp) return true; | |
1154 if (old_fp - ufp > 64 * K) return true; | |
1155 | |
1156 return false; | |
7994 | 1157 #endif |
0 | 1158 } |
1159 | |
1160 #ifdef ASSERT | |
1161 extern "C" void test_random() { | |
1162 const double m = 2147483647; | |
1163 double mean = 0.0, variance = 0.0, t; | |
1164 long reps = 10000; | |
1165 unsigned long seed = 1; | |
1166 | |
1167 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
1168 os::init_random(seed); | |
1169 long num; | |
1170 for (int k = 0; k < reps; k++) { | |
1171 num = os::random(); | |
1172 double u = (double)num / m; | |
1173 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
1174 | |
1175 // calculate mean and variance of the random sequence | |
1176 mean += u; | |
1177 variance += (u*u); | |
1178 } | |
1179 mean /= reps; | |
1180 variance /= (reps - 1); | |
1181 | |
1182 assert(num == 1043618065, "bad seed"); | |
1183 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
1184 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
1185 const double eps = 0.0001; | |
1186 t = fabsd(mean - 0.5018); | |
1187 assert(t < eps, "bad mean"); | |
1188 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
1189 assert(t < eps, "bad variance"); | |
1190 } | |
1191 #endif | |
1192 | |
1193 | |
1194 // Set up the boot classpath. | |
1195 | |
1196 char* os::format_boot_path(const char* format_string, | |
1197 const char* home, | |
1198 int home_len, | |
1199 char fileSep, | |
1200 char pathSep) { | |
1201 assert((fileSep == '/' && pathSep == ':') || | |
14909 | 1202 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); |
0 | 1203 |
1204 // Scan the format string to determine the length of the actual | |
1205 // boot classpath, and handle platform dependencies as well. | |
1206 int formatted_path_len = 0; | |
1207 const char* p; | |
1208 for (p = format_string; *p != 0; ++p) { | |
1209 if (*p == '%') formatted_path_len += home_len - 1; | |
1210 ++formatted_path_len; | |
1211 } | |
1212 | |
6197 | 1213 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); |
0 | 1214 if (formatted_path == NULL) { |
1215 return NULL; | |
1216 } | |
1217 | |
1218 // Create boot classpath from format, substituting separator chars and | |
1219 // java home directory. | |
1220 char* q = formatted_path; | |
1221 for (p = format_string; *p != 0; ++p) { | |
1222 switch (*p) { | |
1223 case '%': | |
1224 strcpy(q, home); | |
1225 q += home_len; | |
1226 break; | |
1227 case '/': | |
1228 *q++ = fileSep; | |
1229 break; | |
1230 case ':': | |
1231 *q++ = pathSep; | |
1232 break; | |
1233 default: | |
1234 *q++ = *p; | |
1235 } | |
1236 } | |
1237 *q = '\0'; | |
1238 | |
1239 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
1240 return formatted_path; | |
1241 } | |
1242 | |
1243 | |
1244 bool os::set_boot_path(char fileSep, char pathSep) { | |
1245 const char* home = Arguments::get_java_home(); | |
1246 int home_len = (int)strlen(home); | |
1247 | |
1248 static const char* meta_index_dir_format = "%/lib/"; | |
1249 static const char* meta_index_format = "%/lib/meta-index"; | |
1250 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
1251 if (meta_index == NULL) return false; | |
1252 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
1253 if (meta_index_dir == NULL) return false; | |
1254 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
1255 | |
1256 // Any modification to the JAR-file list, for the boot classpath must be | |
1257 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
1258 // path class JARs, are stripped for StackMapTable to reduce download size. | |
1259 static const char classpath_format[] = | |
1260 "%/lib/resources.jar:" | |
1261 "%/lib/rt.jar:" | |
1262 "%/lib/sunrsasign.jar:" | |
1263 "%/lib/jsse.jar:" | |
1264 "%/lib/jce.jar:" | |
1265 "%/lib/charsets.jar:" | |
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1266 "%/lib/jfr.jar:" |
14909 | 1267 #ifdef __APPLE__ |
1268 "%/lib/JObjC.jar:" | |
1269 #endif | |
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1270 #ifdef GRAAL |
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1271 "%/lib/graal-loader.jar:" |
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1272 #endif |
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1273 #ifndef NO_TRUFFLE_JAR |
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1274 "%/lib/truffle.jar:" |
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1275 #endif |
0 | 1276 "%/classes"; |
1277 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
1278 if (sysclasspath == NULL) return false; | |
1279 Arguments::set_sysclasspath(sysclasspath); | |
1280 | |
1281 return true; | |
1282 } | |
1283 | |
691 | 1284 /* |
1285 * Splits a path, based on its separator, the number of | |
1286 * elements is returned back in n. | |
1287 * It is the callers responsibility to: | |
1288 * a> check the value of n, and n may be 0. | |
1289 * b> ignore any empty path elements | |
1290 * c> free up the data. | |
1291 */ | |
1292 char** os::split_path(const char* path, int* n) { | |
1293 *n = 0; | |
1294 if (path == NULL || strlen(path) == 0) { | |
1295 return NULL; | |
1296 } | |
1297 const char psepchar = *os::path_separator(); | |
6197 | 1298 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); |
691 | 1299 if (inpath == NULL) { |
1300 return NULL; | |
1301 } | |
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1302 strcpy(inpath, path); |
691 | 1303 int count = 1; |
1304 char* p = strchr(inpath, psepchar); | |
1305 // Get a count of elements to allocate memory | |
1306 while (p != NULL) { | |
1307 count++; | |
1308 p++; | |
1309 p = strchr(p, psepchar); | |
1310 } | |
6197 | 1311 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); |
691 | 1312 if (opath == NULL) { |
1313 return NULL; | |
1314 } | |
1315 | |
1316 // do the actual splitting | |
1317 p = inpath; | |
1318 for (int i = 0 ; i < count ; i++) { | |
1319 size_t len = strcspn(p, os::path_separator()); | |
1320 if (len > JVM_MAXPATHLEN) { | |
1321 return NULL; | |
1322 } | |
1323 // allocate the string and add terminator storage | |
6197 | 1324 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); |
691 | 1325 if (s == NULL) { |
1326 return NULL; | |
1327 } | |
1328 strncpy(s, p, len); | |
1329 s[len] = '\0'; | |
1330 opath[i] = s; | |
1331 p += len + 1; | |
1332 } | |
6197 | 1333 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); |
691 | 1334 *n = count; |
1335 return opath; | |
1336 } | |
1337 | |
0 | 1338 void os::set_memory_serialize_page(address page) { |
1339 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
1340 _mem_serialize_page = (volatile int32_t *)page; | |
1341 // We initialize the serialization page shift count here | |
1342 // We assume a cache line size of 64 bytes | |
1343 assert(SerializePageShiftCount == count, | |
1344 "thread size changed, fix SerializePageShiftCount constant"); | |
1345 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
1346 } | |
1347 | |
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1348 static volatile intptr_t SerializePageLock = 0; |
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1349 |
0 | 1350 // This method is called from signal handler when SIGSEGV occurs while the current |
1351 // thread tries to store to the "read-only" memory serialize page during state | |
1352 // transition. | |
1353 void os::block_on_serialize_page_trap() { | |
1354 if (TraceSafepoint) { | |
1355 tty->print_cr("Block until the serialize page permission restored"); | |
1356 } | |
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1357 // When VMThread is holding the SerializePageLock during modifying the |
0 | 1358 // access permission of the memory serialize page, the following call |
1359 // will block until the permission of that page is restored to rw. | |
1360 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
1361 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1362 // it can occur. |
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1363 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1364 Thread::muxRelease(&SerializePageLock); |
0 | 1365 } |
1366 | |
1367 // Serialize all thread state variables | |
1368 void os::serialize_thread_states() { | |
1369 // On some platforms such as Solaris & Linux, the time duration of the page | |
1370 // permission restoration is observed to be much longer than expected due to | |
1371 // scheduler starvation problem etc. To avoid the long synchronization | |
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1372 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1373 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1374 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1375 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1376 os::vm_page_size(), MEM_PROT_READ); |
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1377 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1378 os::vm_page_size(), MEM_PROT_RW); |
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1379 Thread::muxRelease(&SerializePageLock); |
0 | 1380 } |
1381 | |
1382 // Returns true if the current stack pointer is above the stack shadow | |
1383 // pages, false otherwise. | |
1384 | |
1385 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
1386 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
1387 address sp = current_stack_pointer(); | |
1388 // Check if we have StackShadowPages above the yellow zone. This parameter | |
605 | 1389 // is dependent on the depth of the maximum VM call stack possible from |
0 | 1390 // the handler for stack overflow. 'instanceof' in the stack overflow |
1391 // handler or a println uses at least 8k stack of VM and native code | |
1392 // respectively. | |
1393 const int framesize_in_bytes = | |
1394 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
1395 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
1396 * vm_page_size()) + framesize_in_bytes; | |
1397 // The very lower end of the stack | |
1398 address stack_limit = thread->stack_base() - thread->stack_size(); | |
1399 return (sp > (stack_limit + reserved_area)); | |
1400 } | |
1401 | |
1402 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
1403 uint min_pages) | |
1404 { | |
1405 assert(min_pages > 0, "sanity"); | |
1406 if (UseLargePages) { | |
1407 const size_t max_page_size = region_max_size / min_pages; | |
1408 | |
1409 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
1410 const size_t sz = _page_sizes[i]; | |
1411 const size_t mask = sz - 1; | |
1412 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
1413 // The largest page size with no fragmentation. | |
1414 return sz; | |
1415 } | |
1416 | |
1417 if (sz <= max_page_size) { | |
1418 // The largest page size that satisfies the min_pages requirement. | |
1419 return sz; | |
1420 } | |
1421 } | |
1422 } | |
1423 | |
1424 return vm_page_size(); | |
1425 } | |
1426 | |
1427 #ifndef PRODUCT | |
3859 | 1428 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) |
1429 { | |
1430 if (TracePageSizes) { | |
1431 tty->print("%s: ", str); | |
1432 for (int i = 0; i < count; ++i) { | |
1433 tty->print(" " SIZE_FORMAT, page_sizes[i]); | |
1434 } | |
1435 tty->cr(); | |
1436 } | |
1437 } | |
1438 | |
0 | 1439 void os::trace_page_sizes(const char* str, const size_t region_min_size, |
1440 const size_t region_max_size, const size_t page_size, | |
1441 const char* base, const size_t size) | |
1442 { | |
1443 if (TracePageSizes) { | |
1444 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
1445 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
1446 " size=" SIZE_FORMAT, | |
1447 str, region_min_size, region_max_size, | |
1448 page_size, base, size); | |
1449 } | |
1450 } | |
1451 #endif // #ifndef PRODUCT | |
1452 | |
1453 // This is the working definition of a server class machine: | |
1454 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
1455 // because the graphics memory (?) sometimes masks physical memory. | |
1456 // If you want to change the definition of a server class machine | |
14909 | 1457 // on some OS or platform, e.g., >=4GB on Windohs platforms, |
0 | 1458 // then you'll have to parameterize this method based on that state, |
1459 // as was done for logical processors here, or replicate and | |
1460 // specialize this method for each platform. (Or fix os to have | |
1461 // some inheritance structure and use subclassing. Sigh.) | |
1462 // If you want some platform to always or never behave as a server | |
1463 // class machine, change the setting of AlwaysActAsServerClassMachine | |
1464 // and NeverActAsServerClassMachine in globals*.hpp. | |
1465 bool os::is_server_class_machine() { | |
1466 // First check for the early returns | |
1467 if (NeverActAsServerClassMachine) { | |
1468 return false; | |
1469 } | |
1470 if (AlwaysActAsServerClassMachine) { | |
1471 return true; | |
1472 } | |
1473 // Then actually look at the machine | |
1474 bool result = false; | |
1475 const unsigned int server_processors = 2; | |
1476 const julong server_memory = 2UL * G; | |
1477 // We seem not to get our full complement of memory. | |
1478 // We allow some part (1/8?) of the memory to be "missing", | |
1479 // based on the sizes of DIMMs, and maybe graphics cards. | |
1480 const julong missing_memory = 256UL * M; | |
1481 | |
1482 /* Is this a server class machine? */ | |
1483 if ((os::active_processor_count() >= (int)server_processors) && | |
1484 (os::physical_memory() >= (server_memory - missing_memory))) { | |
1485 const unsigned int logical_processors = | |
1486 VM_Version::logical_processors_per_package(); | |
1487 if (logical_processors > 1) { | |
1488 const unsigned int physical_packages = | |
1489 os::active_processor_count() / logical_processors; | |
1490 if (physical_packages > server_processors) { | |
1491 result = true; | |
1492 } | |
1493 } else { | |
1494 result = true; | |
1495 } | |
1496 } | |
1497 return result; | |
1498 } | |
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1499 |
10405 | 1500 void os::SuspendedThreadTask::run() { |
1501 assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this"); | |
1502 internal_do_task(); | |
1503 _done = true; | |
1504 } | |
1505 | |
6197 | 1506 bool os::create_stack_guard_pages(char* addr, size_t bytes) { |
1507 return os::pd_create_stack_guard_pages(addr, bytes); | |
1508 } | |
1509 | |
1510 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { | |
1511 char* result = pd_reserve_memory(bytes, addr, alignment_hint); | |
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1512 if (result != NULL) { |
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1513 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
6197 | 1514 } |
1515 | |
1516 return result; | |
1517 } | |
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1518 |
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1519 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, |
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1520 MEMFLAGS flags) { |
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1521 char* result = pd_reserve_memory(bytes, addr, alignment_hint); |
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1522 if (result != NULL) { |
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1523 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
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1524 MemTracker::record_virtual_memory_type((address)result, flags); |
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1525 } |
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1526 |
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1527 return result; |
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1528 } |
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1529 |
6197 | 1530 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { |
1531 char* result = pd_attempt_reserve_memory_at(bytes, addr); | |
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1532 if (result != NULL) { |
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1533 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
6197 | 1534 } |
1535 return result; | |
1536 } | |
1537 | |
1538 void os::split_reserved_memory(char *base, size_t size, | |
1539 size_t split, bool realloc) { | |
1540 pd_split_reserved_memory(base, size, split, realloc); | |
1541 } | |
1542 | |
1543 bool os::commit_memory(char* addr, size_t bytes, bool executable) { | |
1544 bool res = pd_commit_memory(addr, bytes, executable); | |
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1545 if (res) { |
6197 | 1546 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); |
1547 } | |
1548 return res; | |
1549 } | |
1550 | |
1551 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, | |
1552 bool executable) { | |
1553 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); | |
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1554 if (res) { |
6197 | 1555 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); |
1556 } | |
1557 return res; | |
1558 } | |
1559 | |
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1560 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, |
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1561 const char* mesg) { |
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1562 pd_commit_memory_or_exit(addr, bytes, executable, mesg); |
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1563 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); |
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1564 } |
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1565 |
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1566 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, |
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1567 bool executable, const char* mesg) { |
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1568 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); |
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1569 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); |
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1570 } |
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1571 |
6197 | 1572 bool os::uncommit_memory(char* addr, size_t bytes) { |
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1573 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); |
6197 | 1574 bool res = pd_uncommit_memory(addr, bytes); |
1575 if (res) { | |
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1576 tkr.record((address)addr, bytes); |
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1577 } else { |
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1578 tkr.discard(); |
6197 | 1579 } |
1580 return res; | |
1581 } | |
1582 | |
1583 bool os::release_memory(char* addr, size_t bytes) { | |
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1584 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
6197 | 1585 bool res = pd_release_memory(addr, bytes); |
1586 if (res) { | |
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1587 tkr.record((address)addr, bytes); |
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1588 } else { |
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1589 tkr.discard(); |
6197 | 1590 } |
1591 return res; | |
1592 } | |
1593 | |
1594 | |
1595 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
1596 char *addr, size_t bytes, bool read_only, | |
1597 bool allow_exec) { | |
1598 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); | |
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1599 if (result != NULL) { |
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1600 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, mtNone, CALLER_PC); |
6197 | 1601 } |
1602 return result; | |
1603 } | |
1604 | |
1605 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
1606 char *addr, size_t bytes, bool read_only, | |
1607 bool allow_exec) { | |
1608 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, | |
1609 read_only, allow_exec); | |
1610 } | |
1611 | |
1612 bool os::unmap_memory(char *addr, size_t bytes) { | |
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1613 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
6197 | 1614 bool result = pd_unmap_memory(addr, bytes); |
1615 if (result) { | |
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1616 tkr.record((address)addr, bytes); |
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1617 } else { |
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1618 tkr.discard(); |
6197 | 1619 } |
1620 return result; | |
1621 } | |
1622 | |
1623 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1624 pd_free_memory(addr, bytes, alignment_hint); | |
1625 } | |
1626 | |
1627 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
1628 pd_realign_memory(addr, bytes, alignment_hint); | |
1629 } | |
1630 | |
10405 | 1631 #ifndef TARGET_OS_FAMILY_windows |
1632 /* try to switch state from state "from" to state "to" | |
1633 * returns the state set after the method is complete | |
1634 */ | |
1635 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, | |
1636 os::SuspendResume::State to) | |
1637 { | |
1638 os::SuspendResume::State result = | |
1639 (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from); | |
1640 if (result == from) { | |
1641 // success | |
1642 return to; | |
1643 } | |
1644 return result; | |
1645 } | |
1646 #endif |