Mon, 18 Mar 2013 13:19:06 +0100
8008555: Debugging code in compiled method sometimes leaks memory
Summary: support for strings that have same life-time as code that uses them.
Reviewed-by: kvn, twisti
duke@435 | 1 | /* |
trims@2708 | 2 | * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 27 | #include "classfile/vmSymbols.hpp" |
stefank@2314 | 28 | #include "memory/allocation.inline.hpp" |
stefank@2314 | 29 | #include "memory/resourceArea.hpp" |
stefank@2314 | 30 | #include "oops/oop.inline.hpp" |
stefank@2314 | 31 | #include "runtime/arguments.hpp" |
stefank@2314 | 32 | #include "runtime/java.hpp" |
stefank@2314 | 33 | #include "runtime/javaCalls.hpp" |
stefank@2314 | 34 | #include "runtime/os.hpp" |
stefank@2314 | 35 | #include "runtime/statSampler.hpp" |
stefank@2314 | 36 | #ifdef TARGET_ARCH_x86 |
stefank@2314 | 37 | # include "vm_version_x86.hpp" |
stefank@2314 | 38 | #endif |
stefank@2314 | 39 | #ifdef TARGET_ARCH_sparc |
stefank@2314 | 40 | # include "vm_version_sparc.hpp" |
stefank@2314 | 41 | #endif |
stefank@2314 | 42 | #ifdef TARGET_ARCH_zero |
stefank@2314 | 43 | # include "vm_version_zero.hpp" |
stefank@2314 | 44 | #endif |
bobv@2508 | 45 | #ifdef TARGET_ARCH_arm |
bobv@2508 | 46 | # include "vm_version_arm.hpp" |
bobv@2508 | 47 | #endif |
bobv@2508 | 48 | #ifdef TARGET_ARCH_ppc |
bobv@2508 | 49 | # include "vm_version_ppc.hpp" |
bobv@2508 | 50 | #endif |
duke@435 | 51 | |
duke@435 | 52 | // -------------------------------------------------------- |
duke@435 | 53 | // StatSamplerTask |
duke@435 | 54 | |
duke@435 | 55 | class StatSamplerTask : public PeriodicTask { |
duke@435 | 56 | public: |
duke@435 | 57 | StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {} |
duke@435 | 58 | void task() { StatSampler::collect_sample(); } |
duke@435 | 59 | }; |
duke@435 | 60 | |
duke@435 | 61 | |
duke@435 | 62 | //---------------------------------------------------------- |
duke@435 | 63 | // Implementation of StatSampler |
duke@435 | 64 | |
duke@435 | 65 | StatSamplerTask* StatSampler::_task = NULL; |
duke@435 | 66 | PerfDataList* StatSampler::_sampled = NULL; |
duke@435 | 67 | |
duke@435 | 68 | /* |
duke@435 | 69 | * the initialize method is called from the engage() method |
duke@435 | 70 | * and is responsible for initializing various global variables. |
duke@435 | 71 | */ |
duke@435 | 72 | void StatSampler::initialize() { |
duke@435 | 73 | |
duke@435 | 74 | if (!UsePerfData) return; |
duke@435 | 75 | |
duke@435 | 76 | // create performance data that could not be created prior |
duke@435 | 77 | // to vm_init_globals() or otherwise have no logical home. |
duke@435 | 78 | |
duke@435 | 79 | create_misc_perfdata(); |
duke@435 | 80 | |
duke@435 | 81 | // get copy of the sampled list |
duke@435 | 82 | _sampled = PerfDataManager::sampled(); |
duke@435 | 83 | |
duke@435 | 84 | } |
duke@435 | 85 | |
duke@435 | 86 | /* |
duke@435 | 87 | * The engage() method is called at initialization time via |
duke@435 | 88 | * Thread::create_vm() to initialize the StatSampler and |
duke@435 | 89 | * register it with the WatcherThread as a periodic task. |
duke@435 | 90 | */ |
duke@435 | 91 | void StatSampler::engage() { |
duke@435 | 92 | |
duke@435 | 93 | if (!UsePerfData) return; |
duke@435 | 94 | |
duke@435 | 95 | if (!is_active()) { |
duke@435 | 96 | |
duke@435 | 97 | initialize(); |
duke@435 | 98 | |
duke@435 | 99 | // start up the periodic task |
duke@435 | 100 | _task = new StatSamplerTask(PerfDataSamplingInterval); |
duke@435 | 101 | _task->enroll(); |
duke@435 | 102 | } |
duke@435 | 103 | } |
duke@435 | 104 | |
duke@435 | 105 | |
duke@435 | 106 | /* |
duke@435 | 107 | * the disengage() method is responsible for deactivating the periodic |
duke@435 | 108 | * task and, if logging was enabled, for logging the final sample. This |
duke@435 | 109 | * method is called from before_exit() in java.cpp and is only called |
duke@435 | 110 | * after the WatcherThread has been stopped. |
duke@435 | 111 | */ |
duke@435 | 112 | void StatSampler::disengage() { |
duke@435 | 113 | |
duke@435 | 114 | if (!UsePerfData) return; |
duke@435 | 115 | |
duke@435 | 116 | if (!is_active()) |
duke@435 | 117 | return; |
duke@435 | 118 | |
duke@435 | 119 | // remove StatSamplerTask |
duke@435 | 120 | _task->disenroll(); |
duke@435 | 121 | delete _task; |
duke@435 | 122 | _task = NULL; |
duke@435 | 123 | |
duke@435 | 124 | // force a final sample |
duke@435 | 125 | sample_data(_sampled); |
duke@435 | 126 | } |
duke@435 | 127 | |
duke@435 | 128 | /* |
duke@435 | 129 | * the destroy method is responsible for releasing any resources used by |
duke@435 | 130 | * the StatSampler prior to shutdown of the VM. this method is called from |
duke@435 | 131 | * before_exit() in java.cpp and is only called after the WatcherThread |
duke@435 | 132 | * has stopped. |
duke@435 | 133 | */ |
duke@435 | 134 | void StatSampler::destroy() { |
duke@435 | 135 | |
duke@435 | 136 | if (!UsePerfData) return; |
duke@435 | 137 | |
duke@435 | 138 | if (_sampled != NULL) { |
duke@435 | 139 | delete(_sampled); |
duke@435 | 140 | _sampled = NULL; |
duke@435 | 141 | } |
duke@435 | 142 | } |
duke@435 | 143 | |
duke@435 | 144 | /* |
duke@435 | 145 | * The sample_data() method is responsible for sampling the |
duke@435 | 146 | * the data value for each PerfData instance in the given list. |
duke@435 | 147 | */ |
duke@435 | 148 | void StatSampler::sample_data(PerfDataList* list) { |
duke@435 | 149 | |
duke@435 | 150 | assert(list != NULL, "null list unexpected"); |
duke@435 | 151 | |
duke@435 | 152 | for (int index = 0; index < list->length(); index++) { |
duke@435 | 153 | PerfData* item = list->at(index); |
duke@435 | 154 | item->sample(); |
duke@435 | 155 | } |
duke@435 | 156 | } |
duke@435 | 157 | |
duke@435 | 158 | /* |
duke@435 | 159 | * the collect_sample() method is the method invoked by the |
duke@435 | 160 | * WatcherThread via the PeriodicTask::task() method. This method |
duke@435 | 161 | * is responsible for collecting data samples from sampled |
duke@435 | 162 | * PerfData instances every PerfDataSamplingInterval milliseconds. |
duke@435 | 163 | * It is also responsible for logging the requested set of |
duke@435 | 164 | * PerfData instances every _sample_count milliseconds. While |
duke@435 | 165 | * logging data, it will output a column header after every _print_header |
duke@435 | 166 | * rows of data have been logged. |
duke@435 | 167 | */ |
duke@435 | 168 | void StatSampler::collect_sample() { |
duke@435 | 169 | |
duke@435 | 170 | // future - check for new PerfData objects. PerfData objects might |
duke@435 | 171 | // get added to the PerfDataManager lists after we have already |
duke@435 | 172 | // built our local copies. |
duke@435 | 173 | // |
duke@435 | 174 | // if (PerfDataManager::count() > previous) { |
duke@435 | 175 | // // get a new copy of the sampled list |
duke@435 | 176 | // if (_sampled != NULL) { |
duke@435 | 177 | // delete(_sampled); |
duke@435 | 178 | // _sampled = NULL; |
duke@435 | 179 | // } |
duke@435 | 180 | // _sampled = PerfDataManager::sampled(); |
duke@435 | 181 | // } |
duke@435 | 182 | |
duke@435 | 183 | assert(_sampled != NULL, "list not initialized"); |
duke@435 | 184 | |
duke@435 | 185 | sample_data(_sampled); |
duke@435 | 186 | } |
duke@435 | 187 | |
duke@435 | 188 | /* |
duke@435 | 189 | * method to upcall into Java to return the value of the specified |
duke@435 | 190 | * property as a utf8 string, or NULL if does not exist. The caller |
duke@435 | 191 | * is responsible for setting a ResourceMark for proper cleanup of |
duke@435 | 192 | * the utf8 strings. |
duke@435 | 193 | */ |
duke@435 | 194 | const char* StatSampler::get_system_property(const char* name, TRAPS) { |
duke@435 | 195 | |
duke@435 | 196 | // setup the arguments to getProperty |
duke@435 | 197 | Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL); |
duke@435 | 198 | |
duke@435 | 199 | // return value |
duke@435 | 200 | JavaValue result(T_OBJECT); |
duke@435 | 201 | |
duke@435 | 202 | // public static String getProperty(String key, String def); |
duke@435 | 203 | JavaCalls::call_static(&result, |
never@1577 | 204 | KlassHandle(THREAD, SystemDictionary::System_klass()), |
coleenp@2497 | 205 | vmSymbols::getProperty_name(), |
coleenp@2497 | 206 | vmSymbols::string_string_signature(), |
duke@435 | 207 | key_str, |
duke@435 | 208 | CHECK_NULL); |
duke@435 | 209 | |
duke@435 | 210 | oop value_oop = (oop)result.get_jobject(); |
duke@435 | 211 | if (value_oop == NULL) { |
duke@435 | 212 | return NULL; |
duke@435 | 213 | } |
duke@435 | 214 | |
duke@435 | 215 | // convert Java String to utf8 string |
duke@435 | 216 | char* value = java_lang_String::as_utf8_string(value_oop); |
duke@435 | 217 | |
duke@435 | 218 | return value; |
duke@435 | 219 | } |
duke@435 | 220 | |
duke@435 | 221 | /* |
duke@435 | 222 | * The list of System Properties that have corresponding PerfData |
duke@435 | 223 | * string instrumentation created by retrieving the named property's |
duke@435 | 224 | * value from System.getProperty() and unconditionally creating a |
duke@435 | 225 | * PerfStringConstant object initialized to the retreived value. This |
duke@435 | 226 | * is not an exhustive list of Java properties with corresponding string |
duke@435 | 227 | * instrumentation as the create_system_property_instrumentation() method |
duke@435 | 228 | * creates other property based instrumentation conditionally. |
duke@435 | 229 | */ |
duke@435 | 230 | |
duke@435 | 231 | // stable interface, supported counters |
duke@435 | 232 | static const char* property_counters_ss[] = { |
duke@435 | 233 | "java.vm.specification.version", |
duke@435 | 234 | "java.vm.specification.name", |
duke@435 | 235 | "java.vm.specification.vendor", |
duke@435 | 236 | "java.vm.version", |
duke@435 | 237 | "java.vm.name", |
duke@435 | 238 | "java.vm.vendor", |
duke@435 | 239 | "java.vm.info", |
duke@435 | 240 | "java.library.path", |
duke@435 | 241 | "java.class.path", |
duke@435 | 242 | "java.endorsed.dirs", |
duke@435 | 243 | "java.ext.dirs", |
thurka@714 | 244 | "java.version", |
duke@435 | 245 | "java.home", |
duke@435 | 246 | NULL |
duke@435 | 247 | }; |
duke@435 | 248 | |
duke@435 | 249 | // unstable interface, supported counters |
duke@435 | 250 | static const char* property_counters_us[] = { |
duke@435 | 251 | NULL |
duke@435 | 252 | }; |
duke@435 | 253 | |
duke@435 | 254 | // unstable interface, unsupported counters |
duke@435 | 255 | static const char* property_counters_uu[] = { |
duke@435 | 256 | "sun.boot.class.path", |
duke@435 | 257 | "sun.boot.library.path", |
duke@435 | 258 | NULL |
duke@435 | 259 | }; |
duke@435 | 260 | |
duke@435 | 261 | typedef struct { |
duke@435 | 262 | const char** property_list; |
duke@435 | 263 | CounterNS name_space; |
duke@435 | 264 | } PropertyCounters; |
duke@435 | 265 | |
duke@435 | 266 | static PropertyCounters property_counters[] = { |
duke@435 | 267 | { property_counters_ss, JAVA_PROPERTY }, |
duke@435 | 268 | { property_counters_us, COM_PROPERTY }, |
duke@435 | 269 | { property_counters_uu, SUN_PROPERTY }, |
duke@435 | 270 | { NULL, SUN_PROPERTY } |
duke@435 | 271 | }; |
duke@435 | 272 | |
duke@435 | 273 | |
duke@435 | 274 | /* |
duke@435 | 275 | * Method to create PerfData string instruments that contain the values |
duke@435 | 276 | * of various system properties. String instruments are created for each |
duke@435 | 277 | * property specified in the property lists provided in property_counters[]. |
duke@435 | 278 | * Property counters have a counter name space prefix prepended to the |
duke@435 | 279 | * property name as indicated in property_counters[]. |
duke@435 | 280 | */ |
duke@435 | 281 | void StatSampler::create_system_property_instrumentation(TRAPS) { |
duke@435 | 282 | |
duke@435 | 283 | ResourceMark rm; |
duke@435 | 284 | |
duke@435 | 285 | for (int i = 0; property_counters[i].property_list != NULL; i++) { |
duke@435 | 286 | |
duke@435 | 287 | for (int j = 0; property_counters[i].property_list[j] != NULL; j++) { |
duke@435 | 288 | |
duke@435 | 289 | const char* property_name = property_counters[i].property_list[j]; |
duke@435 | 290 | assert(property_name != NULL, "property name should not be NULL"); |
duke@435 | 291 | |
duke@435 | 292 | const char* value = get_system_property(property_name, CHECK); |
duke@435 | 293 | |
duke@435 | 294 | // the property must exist |
duke@435 | 295 | assert(value != NULL, "property name should be valid"); |
duke@435 | 296 | |
duke@435 | 297 | if (value != NULL) { |
duke@435 | 298 | // create the property counter |
duke@435 | 299 | PerfDataManager::create_string_constant(property_counters[i].name_space, |
duke@435 | 300 | property_name, value, CHECK); |
duke@435 | 301 | } |
duke@435 | 302 | } |
duke@435 | 303 | } |
duke@435 | 304 | } |
duke@435 | 305 | |
duke@435 | 306 | /* |
duke@435 | 307 | * The create_misc_perfdata() method provides a place to create |
duke@435 | 308 | * PerfData instances that would otherwise have no better place |
duke@435 | 309 | * to exist. |
duke@435 | 310 | */ |
duke@435 | 311 | void StatSampler::create_misc_perfdata() { |
duke@435 | 312 | |
duke@435 | 313 | ResourceMark rm; |
duke@435 | 314 | EXCEPTION_MARK; |
duke@435 | 315 | |
duke@435 | 316 | // numeric constants |
duke@435 | 317 | |
duke@435 | 318 | // frequency of the native high resolution timer |
duke@435 | 319 | PerfDataManager::create_constant(SUN_OS, "hrt.frequency", |
duke@435 | 320 | PerfData::U_Hertz, os::elapsed_frequency(), |
duke@435 | 321 | CHECK); |
duke@435 | 322 | |
duke@435 | 323 | // string constants |
duke@435 | 324 | |
duke@435 | 325 | // create string instrumentation for various Java properties. |
duke@435 | 326 | create_system_property_instrumentation(CHECK); |
duke@435 | 327 | |
duke@435 | 328 | // hotspot flags (from .hotspotrc) and args (from command line) |
duke@435 | 329 | // |
duke@435 | 330 | PerfDataManager::create_string_constant(JAVA_RT, "vmFlags", |
duke@435 | 331 | Arguments::jvm_flags(), CHECK); |
duke@435 | 332 | PerfDataManager::create_string_constant(JAVA_RT, "vmArgs", |
duke@435 | 333 | Arguments::jvm_args(), CHECK); |
duke@435 | 334 | |
duke@435 | 335 | // java class name/jar file and arguments to main class |
duke@435 | 336 | // note: name is cooridnated with launcher and Arguments.cpp |
duke@435 | 337 | PerfDataManager::create_string_constant(SUN_RT, "javaCommand", |
duke@435 | 338 | Arguments::java_command(), CHECK); |
duke@435 | 339 | |
duke@435 | 340 | // the Java VM Internal version string |
duke@435 | 341 | PerfDataManager::create_string_constant(SUN_RT, "internalVersion", |
duke@435 | 342 | VM_Version::internal_vm_info_string(), |
duke@435 | 343 | CHECK); |
duke@435 | 344 | |
duke@435 | 345 | // create sampled instrumentation objects |
duke@435 | 346 | create_sampled_perfdata(); |
duke@435 | 347 | } |
duke@435 | 348 | |
duke@435 | 349 | /* |
duke@435 | 350 | * helper class to provide for sampling of the elapsed_counter value |
duke@435 | 351 | * maintained in the OS class. |
duke@435 | 352 | */ |
duke@435 | 353 | class HighResTimeSampler : public PerfSampleHelper { |
duke@435 | 354 | public: |
duke@435 | 355 | jlong take_sample() { return os::elapsed_counter(); } |
duke@435 | 356 | }; |
duke@435 | 357 | |
duke@435 | 358 | /* |
duke@435 | 359 | * the create_sampled_perdata() method provides a place to instantiate |
duke@435 | 360 | * sampled PerfData instances that would otherwise have no better place |
duke@435 | 361 | * to exist. |
duke@435 | 362 | */ |
duke@435 | 363 | void StatSampler::create_sampled_perfdata() { |
duke@435 | 364 | |
duke@435 | 365 | EXCEPTION_MARK; |
duke@435 | 366 | |
duke@435 | 367 | // setup sampling of the elapsed time counter maintained in the |
duke@435 | 368 | // the os class. This counter can be used as either a time stamp |
duke@435 | 369 | // for each logged entry or as a liveness indicator for the VM. |
duke@435 | 370 | PerfSampleHelper* psh = new HighResTimeSampler(); |
duke@435 | 371 | PerfDataManager::create_counter(SUN_OS, "hrt.ticks", |
duke@435 | 372 | PerfData::U_Ticks, psh, CHECK); |
duke@435 | 373 | } |
duke@435 | 374 | |
duke@435 | 375 | /* |
duke@435 | 376 | * the statSampler_exit() function is called from os_init.cpp on |
duke@435 | 377 | * exit of the vm. |
duke@435 | 378 | */ |
duke@435 | 379 | void statSampler_exit() { |
duke@435 | 380 | |
duke@435 | 381 | if (!UsePerfData) return; |
duke@435 | 382 | |
duke@435 | 383 | StatSampler::destroy(); |
duke@435 | 384 | } |