Tue, 14 May 2013 11:34:30 +0400
8014448: Purge PrintCompactFieldsSavings
Summary: Remove obsolete debugging code.
Reviewed-by: dholmes, kvn
Contributed-by: Aleksey Shipilev <aleksey.shipilev@oracle.com>
coleenp@4037 | 1 | /* |
acorn@4497 | 2 | * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
coleenp@4037 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
coleenp@4037 | 4 | * |
coleenp@4037 | 5 | * This code is free software; you can redistribute it and/or modify it |
coleenp@4037 | 6 | * under the terms of the GNU General Public License version 2 only, as |
coleenp@4037 | 7 | * published by the Free Software Foundation. |
coleenp@4037 | 8 | * |
coleenp@4037 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
coleenp@4037 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
katleman@4376 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
coleenp@4037 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
coleenp@4037 | 13 | * accompanied this code). |
coleenp@4037 | 14 | * |
coleenp@4037 | 15 | * You should have received a copy of the GNU General Public License version |
coleenp@4037 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
coleenp@4037 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
coleenp@4037 | 18 | * |
coleenp@4037 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
coleenp@4037 | 20 | * or visit www.oracle.com if you need additional information or have any |
coleenp@4037 | 21 | * questions. |
coleenp@4037 | 22 | * |
coleenp@4037 | 23 | */ |
coleenp@4037 | 24 | |
coleenp@4037 | 25 | #ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |
coleenp@4037 | 26 | #define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |
coleenp@4037 | 27 | |
coleenp@4037 | 28 | #include "memory/allocation.hpp" |
coleenp@4037 | 29 | #include "memory/memRegion.hpp" |
coleenp@4037 | 30 | #include "memory/metaspace.hpp" |
coleenp@4037 | 31 | #include "memory/metaspaceCounters.hpp" |
coleenp@4037 | 32 | #include "runtime/mutex.hpp" |
coleenp@4037 | 33 | #include "utilities/growableArray.hpp" |
coleenp@4037 | 34 | |
coleenp@4037 | 35 | // |
coleenp@4037 | 36 | // A class loader represents a linkset. Conceptually, a linkset identifies |
coleenp@4037 | 37 | // the complete transitive closure of resolved links that a dynamic linker can |
coleenp@4037 | 38 | // produce. |
coleenp@4037 | 39 | // |
coleenp@4037 | 40 | // A ClassLoaderData also encapsulates the allocation space, called a metaspace, |
coleenp@4037 | 41 | // used by the dynamic linker to allocate the runtime representation of all |
coleenp@4037 | 42 | // the types it defines. |
coleenp@4037 | 43 | // |
coleenp@4037 | 44 | // ClassLoaderData are stored in the runtime representation of classes and the |
coleenp@4037 | 45 | // system dictionary, are roots of garbage collection, and provides iterators |
coleenp@4037 | 46 | // for root tracing and other GC operations. |
coleenp@4037 | 47 | |
coleenp@4037 | 48 | class ClassLoaderData; |
coleenp@4037 | 49 | class JNIMethodBlock; |
coleenp@4037 | 50 | class JNIHandleBlock; |
coleenp@4037 | 51 | class Metadebug; |
coleenp@4037 | 52 | // GC root for walking class loader data created |
coleenp@4037 | 53 | |
coleenp@4037 | 54 | class ClassLoaderDataGraph : public AllStatic { |
coleenp@4037 | 55 | friend class ClassLoaderData; |
coleenp@4037 | 56 | friend class ClassLoaderDataGraphMetaspaceIterator; |
coleenp@4037 | 57 | friend class VMStructs; |
coleenp@4037 | 58 | private: |
coleenp@4037 | 59 | // All CLDs (except the null CLD) can be reached by walking _head->_next->... |
coleenp@4037 | 60 | static ClassLoaderData* _head; |
coleenp@4037 | 61 | static ClassLoaderData* _unloading; |
coleenp@4037 | 62 | // CMS support. |
coleenp@4037 | 63 | static ClassLoaderData* _saved_head; |
coleenp@4037 | 64 | |
mgerdin@5013 | 65 | static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS); |
coleenp@4037 | 66 | public: |
coleenp@4304 | 67 | static ClassLoaderData* find_or_create(Handle class_loader, TRAPS); |
coleenp@4037 | 68 | static void purge(); |
coleenp@4037 | 69 | static void clear_claimed_marks(); |
coleenp@4037 | 70 | static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
coleenp@4037 | 71 | static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
coleenp@4304 | 72 | static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
coleenp@4037 | 73 | static void classes_do(KlassClosure* klass_closure); |
coleenp@4037 | 74 | static bool do_unloading(BoolObjectClosure* is_alive); |
coleenp@4037 | 75 | |
coleenp@4037 | 76 | // CMS support. |
coleenp@4037 | 77 | static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); } |
coleenp@4037 | 78 | static GrowableArray<ClassLoaderData*>* new_clds(); |
coleenp@4037 | 79 | |
coleenp@4037 | 80 | static void dump_on(outputStream * const out) PRODUCT_RETURN; |
coleenp@4037 | 81 | static void dump() { dump_on(tty); } |
coleenp@4037 | 82 | static void verify(); |
coleenp@4037 | 83 | |
coleenp@4037 | 84 | #ifndef PRODUCT |
coleenp@4037 | 85 | // expensive test for pointer in metaspace for debugging |
coleenp@4037 | 86 | static bool contains(address x); |
coleenp@4037 | 87 | static bool contains_loader_data(ClassLoaderData* loader_data); |
coleenp@4037 | 88 | #endif |
coleenp@4037 | 89 | }; |
coleenp@4037 | 90 | |
coleenp@4037 | 91 | // ClassLoaderData class |
coleenp@4037 | 92 | |
coleenp@4037 | 93 | class ClassLoaderData : public CHeapObj<mtClass> { |
coleenp@4037 | 94 | friend class VMStructs; |
coleenp@4037 | 95 | private: |
mgerdin@4903 | 96 | class Dependencies VALUE_OBJ_CLASS_SPEC { |
mgerdin@4903 | 97 | objArrayOop _list_head; |
mgerdin@4903 | 98 | void locked_add(objArrayHandle last, |
mgerdin@4903 | 99 | objArrayHandle new_dependency, |
mgerdin@4903 | 100 | Thread* THREAD); |
mgerdin@4903 | 101 | public: |
mgerdin@4903 | 102 | Dependencies() : _list_head(NULL) {} |
mgerdin@5016 | 103 | Dependencies(TRAPS) : _list_head(NULL) { |
mgerdin@5016 | 104 | init(CHECK); |
mgerdin@5016 | 105 | } |
mgerdin@4903 | 106 | void add(Handle dependency, TRAPS); |
mgerdin@4903 | 107 | void init(TRAPS); |
mgerdin@4903 | 108 | void oops_do(OopClosure* f); |
mgerdin@4903 | 109 | }; |
mgerdin@4903 | 110 | |
coleenp@4037 | 111 | friend class ClassLoaderDataGraph; |
coleenp@4037 | 112 | friend class ClassLoaderDataGraphMetaspaceIterator; |
coleenp@4037 | 113 | friend class MetaDataFactory; |
coleenp@4037 | 114 | friend class Method; |
coleenp@4037 | 115 | |
coleenp@4037 | 116 | static ClassLoaderData * _the_null_class_loader_data; |
coleenp@4037 | 117 | |
mgerdin@4903 | 118 | oop _class_loader; // oop used to uniquely identify a class loader |
mgerdin@4903 | 119 | // class loader or a canonical class path |
mgerdin@4903 | 120 | Dependencies _dependencies; // holds dependencies from this class loader |
mgerdin@4903 | 121 | // data to others. |
mgerdin@4903 | 122 | |
coleenp@4037 | 123 | Metaspace * _metaspace; // Meta-space where meta-data defined by the |
coleenp@4037 | 124 | // classes in the class loader are allocated. |
coleenp@4037 | 125 | Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup. |
coleenp@4037 | 126 | bool _unloading; // true if this class loader goes away |
coleenp@4304 | 127 | bool _keep_alive; // if this CLD can be unloaded for anonymous loaders |
coleenp@4345 | 128 | bool _is_anonymous; // if this CLD is for an anonymous class |
coleenp@4037 | 129 | volatile int _claimed; // true if claimed, for example during GC traces. |
coleenp@4037 | 130 | // To avoid applying oop closure more than once. |
coleenp@4037 | 131 | // Has to be an int because we cas it. |
coleenp@4037 | 132 | Klass* _klasses; // The classes defined by the class loader. |
coleenp@4037 | 133 | |
coleenp@4037 | 134 | JNIHandleBlock* _handles; // Handles to constant pool arrays |
coleenp@4037 | 135 | |
coleenp@4037 | 136 | // These method IDs are created for the class loader and set to NULL when the |
coleenp@4037 | 137 | // class loader is unloaded. They are rarely freed, only for redefine classes |
coleenp@4037 | 138 | // and if they lose a data race in InstanceKlass. |
coleenp@4037 | 139 | JNIMethodBlock* _jmethod_ids; |
coleenp@4037 | 140 | |
coleenp@4037 | 141 | // Metadata to be deallocated when it's safe at class unloading, when |
coleenp@4037 | 142 | // this class loader isn't unloaded itself. |
coleenp@4037 | 143 | GrowableArray<Metadata*>* _deallocate_list; |
coleenp@4037 | 144 | |
coleenp@4037 | 145 | // Support for walking class loader data objects |
coleenp@4037 | 146 | ClassLoaderData* _next; /// Next loader_datas created |
coleenp@4037 | 147 | |
coleenp@4037 | 148 | // ReadOnly and ReadWrite metaspaces (static because only on the null |
coleenp@4037 | 149 | // class loader for now). |
coleenp@4037 | 150 | static Metaspace* _ro_metaspace; |
coleenp@4037 | 151 | static Metaspace* _rw_metaspace; |
coleenp@4037 | 152 | |
coleenp@4037 | 153 | void set_next(ClassLoaderData* next) { _next = next; } |
coleenp@4037 | 154 | ClassLoaderData* next() const { return _next; } |
coleenp@4037 | 155 | |
mgerdin@5016 | 156 | ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies); |
coleenp@4037 | 157 | ~ClassLoaderData(); |
coleenp@4037 | 158 | |
coleenp@4037 | 159 | void set_metaspace(Metaspace* m) { _metaspace = m; } |
coleenp@4037 | 160 | |
coleenp@4037 | 161 | JNIHandleBlock* handles() const; |
coleenp@4037 | 162 | void set_handles(JNIHandleBlock* handles); |
coleenp@4037 | 163 | |
coleenp@4037 | 164 | Mutex* metaspace_lock() const { return _metaspace_lock; } |
coleenp@4037 | 165 | |
coleenp@4037 | 166 | // GC interface. |
coleenp@4037 | 167 | void clear_claimed() { _claimed = 0; } |
coleenp@4037 | 168 | bool claimed() const { return _claimed == 1; } |
coleenp@4037 | 169 | bool claim(); |
coleenp@4037 | 170 | |
coleenp@4304 | 171 | void unload(); |
coleenp@4304 | 172 | bool keep_alive() const { return _keep_alive; } |
coleenp@4304 | 173 | bool is_alive(BoolObjectClosure* is_alive_closure) const; |
coleenp@4037 | 174 | |
coleenp@4037 | 175 | void classes_do(void f(InstanceKlass*)); |
coleenp@4037 | 176 | |
coleenp@4037 | 177 | // Deallocate free list during class unloading. |
coleenp@4037 | 178 | void free_deallocate_list(); |
coleenp@4037 | 179 | |
coleenp@4037 | 180 | // Allocate out of this class loader data |
coleenp@4037 | 181 | MetaWord* allocate(size_t size); |
coleenp@4037 | 182 | |
coleenp@4037 | 183 | public: |
coleenp@4037 | 184 | // Accessors |
coleenp@4037 | 185 | Metaspace* metaspace_or_null() const { return _metaspace; } |
coleenp@4037 | 186 | |
coleenp@4037 | 187 | static ClassLoaderData* the_null_class_loader_data() { |
coleenp@4037 | 188 | return _the_null_class_loader_data; |
coleenp@4037 | 189 | } |
coleenp@4037 | 190 | |
coleenp@4345 | 191 | bool is_anonymous() const { return _is_anonymous; } |
coleenp@4304 | 192 | |
coleenp@4037 | 193 | static void init_null_class_loader_data() { |
coleenp@4037 | 194 | assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
coleenp@4037 | 195 | assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
mgerdin@5016 | 196 | |
mgerdin@5016 | 197 | // We explicitly initialize the Dependencies object at a later phase in the initialization |
mgerdin@5016 | 198 | _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies()); |
coleenp@4037 | 199 | ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
coleenp@4037 | 200 | assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
coleenp@4037 | 201 | if (DumpSharedSpaces) { |
coleenp@4037 | 202 | _the_null_class_loader_data->initialize_shared_metaspaces(); |
coleenp@4037 | 203 | } |
coleenp@4037 | 204 | } |
coleenp@4037 | 205 | |
coleenp@4037 | 206 | bool is_the_null_class_loader_data() const { |
coleenp@4037 | 207 | return this == _the_null_class_loader_data; |
coleenp@4037 | 208 | } |
twisti@4866 | 209 | bool is_ext_class_loader_data() const; |
coleenp@4037 | 210 | |
coleenp@4037 | 211 | // The Metaspace is created lazily so may be NULL. This |
coleenp@4037 | 212 | // method will allocate a Metaspace if needed. |
coleenp@4037 | 213 | Metaspace* metaspace_non_null(); |
coleenp@4037 | 214 | |
coleenp@4037 | 215 | oop class_loader() const { return _class_loader; } |
coleenp@4037 | 216 | |
coleenp@4037 | 217 | // Returns true if this class loader data is for a loader going away. |
coleenp@4037 | 218 | bool is_unloading() const { |
coleenp@4037 | 219 | assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
coleenp@4037 | 220 | return _unloading; |
coleenp@4037 | 221 | } |
coleenp@4304 | 222 | // Anonymous class loader data doesn't have anything to keep them from |
coleenp@4304 | 223 | // being unloaded during parsing the anonymous class. |
coleenp@4304 | 224 | void set_keep_alive(bool value) { _keep_alive = value; } |
coleenp@4037 | 225 | |
coleenp@4037 | 226 | unsigned int identity_hash() { |
coleenp@4037 | 227 | return _class_loader == NULL ? 0 : _class_loader->identity_hash(); |
coleenp@4037 | 228 | } |
coleenp@4037 | 229 | |
coleenp@4037 | 230 | // Used when tracing from klasses. |
coleenp@4037 | 231 | void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
coleenp@4037 | 232 | |
coleenp@4037 | 233 | void classes_do(KlassClosure* klass_closure); |
coleenp@4037 | 234 | |
coleenp@4037 | 235 | JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
coleenp@4037 | 236 | void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
coleenp@4037 | 237 | |
coleenp@4037 | 238 | void print_value() { print_value_on(tty); } |
acorn@4497 | 239 | void print_value_on(outputStream* out) const; |
coleenp@4037 | 240 | void dump(outputStream * const out) PRODUCT_RETURN; |
coleenp@4037 | 241 | void verify(); |
coleenp@4304 | 242 | const char* loader_name(); |
coleenp@4037 | 243 | |
coleenp@4037 | 244 | jobject add_handle(Handle h); |
coleenp@4037 | 245 | void add_class(Klass* k); |
coleenp@4037 | 246 | void remove_class(Klass* k); |
coleenp@4037 | 247 | void record_dependency(Klass* to, TRAPS); |
coleenp@4304 | 248 | void init_dependencies(TRAPS); |
coleenp@4037 | 249 | |
coleenp@4037 | 250 | void add_to_deallocate_list(Metadata* m); |
coleenp@4037 | 251 | |
coleenp@4037 | 252 | static ClassLoaderData* class_loader_data(oop loader); |
stefank@4667 | 253 | static ClassLoaderData* class_loader_data_or_null(oop loader); |
coleenp@4304 | 254 | static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS); |
coleenp@4037 | 255 | static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
coleenp@4037 | 256 | |
coleenp@4037 | 257 | // CDS support |
coleenp@4037 | 258 | Metaspace* ro_metaspace(); |
coleenp@4037 | 259 | Metaspace* rw_metaspace(); |
coleenp@4037 | 260 | void initialize_shared_metaspaces(); |
coleenp@4037 | 261 | }; |
coleenp@4037 | 262 | |
coleenp@4037 | 263 | class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
coleenp@4037 | 264 | ClassLoaderData* _data; |
coleenp@4037 | 265 | public: |
coleenp@4037 | 266 | ClassLoaderDataGraphMetaspaceIterator(); |
coleenp@4037 | 267 | ~ClassLoaderDataGraphMetaspaceIterator(); |
coleenp@4037 | 268 | bool repeat() { return _data != NULL; } |
coleenp@4037 | 269 | Metaspace* get_next() { |
coleenp@4037 | 270 | assert(_data != NULL, "Should not be NULL in call to the iterator"); |
coleenp@4037 | 271 | Metaspace* result = _data->metaspace_or_null(); |
coleenp@4037 | 272 | _data = _data->next(); |
coleenp@4037 | 273 | // This result might be NULL for class loaders without metaspace |
coleenp@4037 | 274 | // yet. It would be nice to return only non-null results but |
coleenp@4037 | 275 | // there is no guarantee that there will be a non-null result |
coleenp@4037 | 276 | // down the list so the caller is going to have to check. |
coleenp@4037 | 277 | return result; |
coleenp@4037 | 278 | } |
coleenp@4037 | 279 | }; |
coleenp@4037 | 280 | #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |