Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 8ce625481709 |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "classfile/vmSymbols.hpp" | |
| 28 #include "gc_implementation/shared/markSweep.inline.hpp" | |
| 29 #include "memory/gcLocker.hpp" | |
| 30 #include "memory/resourceArea.hpp" | |
| 31 #include "memory/universe.inline.hpp" | |
| 32 #include "oops/instanceKlass.hpp" | |
| 33 #include "oops/klassVtable.hpp" | |
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34 #include "oops/method.hpp" |
| 1972 | 35 #include "oops/objArrayOop.hpp" |
| 36 #include "oops/oop.inline.hpp" | |
| 37 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 38 #include "runtime/arguments.hpp" | |
| 39 #include "runtime/handles.inline.hpp" | |
| 40 #include "utilities/copy.hpp" | |
| 0 | 41 |
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42 inline InstanceKlass* klassVtable::ik() const { |
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43 Klass* k = _klass(); |
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44 assert(k->oop_is_instance(), "not an InstanceKlass"); |
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45 return (InstanceKlass*)k; |
| 0 | 46 } |
| 47 | |
| 48 | |
| 49 // this function computes the vtable size (including the size needed for miranda | |
| 50 // methods) and the number of miranda methods in this class | |
| 51 // Note on Miranda methods: Let's say there is a class C that implements | |
| 52 // interface I. Let's say there is a method m in I that neither C nor any | |
| 53 // of its super classes implement (i.e there is no method of any access, with | |
| 54 // the same name and signature as m), then m is a Miranda method which is | |
| 55 // entered as a public abstract method in C's vtable. From then on it should | |
| 56 // treated as any other public method in C for method over-ride purposes. | |
| 57 void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length, | |
| 58 int &num_miranda_methods, | |
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59 Klass* super, |
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60 Array<Method*>* methods, |
| 0 | 61 AccessFlags class_flags, |
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62 Handle classloader, |
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63 Symbol* classname, |
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64 Array<Klass*>* local_interfaces, |
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65 TRAPS |
| 0 | 66 ) { |
| 67 | |
| 68 No_Safepoint_Verifier nsv; | |
| 69 | |
| 70 // set up default result values | |
| 71 vtable_length = 0; | |
| 72 num_miranda_methods = 0; | |
| 73 | |
| 74 // start off with super's vtable length | |
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75 InstanceKlass* sk = (InstanceKlass*)super; |
| 0 | 76 vtable_length = super == NULL ? 0 : sk->vtable_length(); |
| 77 | |
| 78 // go thru each method in the methods table to see if it needs a new entry | |
| 79 int len = methods->length(); | |
| 80 for (int i = 0; i < len; i++) { | |
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81 assert(methods->at(i)->is_method(), "must be a Method*"); |
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82 methodHandle mh(THREAD, methods->at(i)); |
| 0 | 83 |
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84 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
| 0 | 85 vtable_length += vtableEntry::size(); // we need a new entry |
| 86 } | |
| 87 } | |
| 88 | |
| 89 // compute the number of mirandas methods that must be added to the end | |
| 90 num_miranda_methods = get_num_mirandas(super, methods, local_interfaces); | |
| 91 vtable_length += (num_miranda_methods * vtableEntry::size()); | |
| 92 | |
| 93 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
| 94 // array classes don't have their superclass set correctly during | |
| 95 // bootstrapping | |
| 96 vtable_length = Universe::base_vtable_size(); | |
| 97 } | |
| 98 | |
| 99 if (super == NULL && !Universe::is_bootstrapping() && | |
| 100 vtable_length != Universe::base_vtable_size()) { | |
| 101 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
| 102 // only way this should happen is from | |
| 103 // SystemDictionary::resolve_from_stream(), which will detect this later | |
| 104 // and throw a security exception. So don't assert here to let | |
| 105 // the exception occur. | |
| 106 vtable_length = Universe::base_vtable_size(); | |
| 107 } | |
| 108 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
| 109 "bad vtable size for class Object"); | |
| 110 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
| 111 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
| 112 } | |
| 113 | |
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114 int klassVtable::index_of(Method* m, int len) const { |
| 0 | 115 assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); |
| 116 return m->vtable_index(); | |
| 117 } | |
| 118 | |
| 119 int klassVtable::initialize_from_super(KlassHandle super) { | |
| 120 if (super.is_null()) { | |
| 121 return 0; | |
| 122 } else { | |
| 123 // copy methods from superKlass | |
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124 // can't inherit from array class, so must be InstanceKlass |
| 0 | 125 assert(super->oop_is_instance(), "must be instance klass"); |
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126 InstanceKlass* sk = (InstanceKlass*)super(); |
| 0 | 127 klassVtable* superVtable = sk->vtable(); |
| 128 assert(superVtable->length() <= _length, "vtable too short"); | |
| 129 #ifdef ASSERT | |
| 130 superVtable->verify(tty, true); | |
| 131 #endif | |
| 132 superVtable->copy_vtable_to(table()); | |
| 133 #ifndef PRODUCT | |
| 134 if (PrintVtables && Verbose) { | |
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135 ResourceMark rm; |
| 0 | 136 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
| 137 } | |
| 138 #endif | |
| 139 return superVtable->length(); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 // Revised lookup semantics introduced 1.3 (Kestral beta) | |
| 144 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { | |
| 145 | |
| 146 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
| 147 KlassHandle super (THREAD, klass()->java_super()); | |
| 148 int nofNewEntries = 0; | |
| 149 | |
| 150 | |
| 151 if (PrintVtables && !klass()->oop_is_array()) { | |
| 152 ResourceMark rm(THREAD); | |
| 153 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
| 154 } | |
| 155 | |
| 156 #ifdef ASSERT | |
| 157 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 158 oop* end_of_vtable = (oop*)&table()[_length]; | |
| 159 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
| 160 #endif | |
| 161 | |
| 162 if (Universe::is_bootstrapping()) { | |
| 163 // just clear everything | |
| 164 for (int i = 0; i < _length; i++) table()[i].clear(); | |
| 165 return; | |
| 166 } | |
| 167 | |
| 168 int super_vtable_len = initialize_from_super(super); | |
| 169 if (klass()->oop_is_array()) { | |
| 170 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
| 171 } else { | |
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172 assert(_klass->oop_is_instance(), "must be InstanceKlass"); |
| 0 | 173 |
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174 Array<Method*>* methods = ik()->methods(); |
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175 int len = methods->length(); |
| 0 | 176 int initialized = super_vtable_len; |
| 177 | |
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178 // update_inherited_vtable can stop for gc - ensure using handles |
| 0 | 179 for (int i = 0; i < len; i++) { |
| 180 HandleMark hm(THREAD); | |
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181 assert(methods->at(i)->is_method(), "must be a Method*"); |
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182 methodHandle mh(THREAD, methods->at(i)); |
| 0 | 183 |
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184 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
| 0 | 185 |
| 186 if (needs_new_entry) { | |
| 187 put_method_at(mh(), initialized); | |
| 188 mh()->set_vtable_index(initialized); // set primary vtable index | |
| 189 initialized++; | |
| 190 } | |
| 191 } | |
| 192 | |
| 193 // add miranda methods; it will also update the value of initialized | |
| 194 fill_in_mirandas(initialized); | |
| 195 | |
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196 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
| 0 | 197 // package_private -> publicprotected), the vtable might actually be smaller than our initial |
| 198 // calculation. | |
| 199 assert(initialized <= _length, "vtable initialization failed"); | |
| 200 for(;initialized < _length; initialized++) { | |
| 201 put_method_at(NULL, initialized); | |
| 202 } | |
| 203 NOT_PRODUCT(verify(tty, true)); | |
| 204 } | |
| 205 } | |
| 206 | |
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207 // Called for cases where a method does not override its superclass' vtable entry |
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208 // For bytecodes not produced by javac together it is possible that a method does not override |
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209 // the superclass's method, but might indirectly override a super-super class's vtable entry |
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210 // If none found, return a null superk, else return the superk of the method this does override |
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211 InstanceKlass* klassVtable::find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, |
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212 int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) { |
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213 InstanceKlass* superk = initialsuper; |
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214 while (superk != NULL && superk->super() != NULL) { |
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215 InstanceKlass* supersuperklass = InstanceKlass::cast(superk->super()); |
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216 klassVtable* ssVtable = supersuperklass->vtable(); |
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217 if (vtable_index < ssVtable->length()) { |
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218 Method* super_method = ssVtable->method_at(vtable_index); |
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219 #ifndef PRODUCT |
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220 Symbol* name= target_method()->name(); |
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221 Symbol* signature = target_method()->signature(); |
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222 assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch"); |
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223 #endif |
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224 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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225 #ifndef PRODUCT |
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226 if (PrintVtables && Verbose) { |
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227 ResourceMark rm(THREAD); |
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228 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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229 supersuperklass->internal_name(), |
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230 _klass->internal_name(), (target_method() != NULL) ? |
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231 target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
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232 super_method->access_flags().print_on(tty); |
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233 tty->print("overriders flags: "); |
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234 target_method->access_flags().print_on(tty); |
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235 tty->cr(); |
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236 } |
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237 #endif /*PRODUCT*/ |
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238 break; // return found superk |
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239 } |
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240 } else { |
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241 // super class has no vtable entry here, stop transitive search |
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242 superk = (InstanceKlass*)NULL; |
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243 break; |
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244 } |
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245 // if no override found yet, continue to search up |
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246 superk = InstanceKlass::cast(superk->super()); |
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247 } |
| 0 | 248 |
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249 return superk; |
| 0 | 250 } |
| 251 | |
| 252 | |
| 253 // Update child's copy of super vtable for overrides | |
| 254 // OR return true if a new vtable entry is required | |
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255 // Only called for InstanceKlass's, i.e. not for arrays |
| 0 | 256 // If that changed, could not use _klass as handle for klass |
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257 bool klassVtable::update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, |
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258 bool checkconstraints, TRAPS) { |
| 0 | 259 ResourceMark rm; |
| 260 bool allocate_new = true; | |
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261 assert(klass->oop_is_instance(), "must be InstanceKlass"); |
| 0 | 262 |
| 263 // Initialize the method's vtable index to "nonvirtual". | |
| 264 // If we allocate a vtable entry, we will update it to a non-negative number. | |
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265 target_method()->set_vtable_index(Method::nonvirtual_vtable_index); |
| 0 | 266 |
| 267 // Static and <init> methods are never in | |
| 268 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
| 269 return false; | |
| 270 } | |
| 271 | |
| 272 if (klass->is_final() || target_method()->is_final()) { | |
| 273 // a final method never needs a new entry; final methods can be statically | |
| 274 // resolved and they have to be present in the vtable only if they override | |
| 275 // a super's method, in which case they re-use its entry | |
| 276 allocate_new = false; | |
| 277 } | |
| 278 | |
| 279 // we need a new entry if there is no superclass | |
| 280 if (klass->super() == NULL) { | |
| 281 return allocate_new; | |
| 282 } | |
| 283 | |
| 284 // private methods always have a new entry in the vtable | |
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285 // specification interpretation since classic has |
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286 // private methods not overriding |
| 0 | 287 if (target_method()->is_private()) { |
| 288 return allocate_new; | |
| 289 } | |
| 290 | |
| 291 // search through the vtable and update overridden entries | |
| 292 // Since check_signature_loaders acquires SystemDictionary_lock | |
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293 // which can block for gc, once we are in this loop, use handles |
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294 // For classfiles built with >= jdk7, we now look for transitive overrides |
| 0 | 295 |
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296 Symbol* name = target_method()->name(); |
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297 Symbol* signature = target_method()->signature(); |
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298 Handle target_loader(THREAD, _klass()->class_loader()); |
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299 Symbol* target_classname = _klass->name(); |
| 0 | 300 for(int i = 0; i < super_vtable_len; i++) { |
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301 Method* super_method = method_at(i); |
| 0 | 302 // Check if method name matches |
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303 if (super_method->name() == name && super_method->signature() == signature) { |
| 0 | 304 |
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305 // get super_klass for method_holder for the found method |
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306 InstanceKlass* super_klass = InstanceKlass::cast(super_method->method_holder()); |
| 0 | 307 |
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308 if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
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309 ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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310 && ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
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311 target_classname, THREAD)) != (InstanceKlass*)NULL))) { |
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312 // overriding, so no new entry |
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313 allocate_new = false; |
| 0 | 314 |
| 315 if (checkconstraints) { | |
| 316 // Override vtable entry if passes loader constraint check | |
| 317 // if loader constraint checking requested | |
| 318 // No need to visit his super, since he and his super | |
| 319 // have already made any needed loader constraints. | |
| 320 // Since loader constraints are transitive, it is enough | |
| 321 // to link to the first super, and we get all the others. | |
| 322 Handle super_loader(THREAD, super_klass->class_loader()); | |
| 323 | |
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324 if (target_loader() != super_loader()) { |
| 0 | 325 ResourceMark rm(THREAD); |
| 326 char* failed_type_name = | |
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327 SystemDictionary::check_signature_loaders(signature, target_loader, |
| 0 | 328 super_loader, true, |
| 329 CHECK_(false)); | |
| 330 if (failed_type_name != NULL) { | |
| 331 const char* msg = "loader constraint violation: when resolving " | |
| 332 "overridden method \"%s\" the class loader (instance" | |
| 333 " of %s) of the current class, %s, and its superclass loader " | |
| 334 "(instance of %s), have different Class objects for the type " | |
| 335 "%s used in the signature"; | |
| 336 char* sig = target_method()->name_and_sig_as_C_string(); | |
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337 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
| 0 | 338 char* current = _klass->name()->as_C_string(); |
| 339 const char* loader2 = SystemDictionary::loader_name(super_loader()); | |
| 340 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
| 341 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
| 342 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 343 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 344 failed_type_name); | |
| 345 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
| 346 } | |
| 347 } | |
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348 } |
| 0 | 349 |
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350 put_method_at(target_method(), i); |
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351 target_method()->set_vtable_index(i); |
| 0 | 352 #ifndef PRODUCT |
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353 if (PrintVtables && Verbose) { |
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354 tty->print("overriding with %s::%s index %d, original flags: ", |
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355 _klass->internal_name(), (target_method() != NULL) ? |
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356 target_method()->name()->as_C_string() : "<NULL>", i); |
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357 super_method->access_flags().print_on(tty); |
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358 tty->print("overriders flags: "); |
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359 target_method->access_flags().print_on(tty); |
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360 tty->cr(); |
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361 } |
| 0 | 362 #endif /*PRODUCT*/ |
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363 } else { |
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364 // allocate_new = true; default. We might override one entry, |
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365 // but not override another. Once we override one, not need new |
| 0 | 366 #ifndef PRODUCT |
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367 if (PrintVtables && Verbose) { |
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368 tty->print("NOT overriding with %s::%s index %d, original flags: ", |
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369 _klass->internal_name(), (target_method() != NULL) ? |
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370 target_method()->name()->as_C_string() : "<NULL>", i); |
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371 super_method->access_flags().print_on(tty); |
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372 tty->print("overriders flags: "); |
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373 target_method->access_flags().print_on(tty); |
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374 tty->cr(); |
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375 } |
| 0 | 376 #endif /*PRODUCT*/ |
| 377 } | |
| 378 } | |
| 379 } | |
| 380 return allocate_new; | |
| 381 } | |
| 382 | |
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383 void klassVtable::put_method_at(Method* m, int index) { |
| 0 | 384 #ifndef PRODUCT |
| 385 if (PrintVtables && Verbose) { | |
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386 ResourceMark rm; |
| 0 | 387 tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
| 388 (m != NULL) ? m->name()->as_C_string() : "<NULL>", index); | |
| 389 } | |
| 390 #endif | |
| 391 table()[index].set(m); | |
| 392 } | |
| 393 | |
| 394 // Find out if a method "m" with superclass "super", loader "classloader" and | |
| 395 // name "classname" needs a new vtable entry. Let P be a class package defined | |
| 396 // by "classloader" and "classname". | |
| 397 // NOTE: The logic used here is very similar to the one used for computing | |
| 398 // the vtables indices for a method. We cannot directly use that function because, | |
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399 // we allocate the InstanceKlass at load time, and that requires that the |
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400 // superclass has been loaded. |
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401 // However, the vtable entries are filled in at link time, and therefore |
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402 // the superclass' vtable may not yet have been filled in. |
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403 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
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404 Klass* super, |
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405 Handle classloader, |
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406 Symbol* classname, |
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407 AccessFlags class_flags, |
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408 TRAPS) { |
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409 if ((class_flags.is_final() || target_method()->is_final()) || |
| 0 | 410 // a final method never needs a new entry; final methods can be statically |
| 411 // resolved and they have to be present in the vtable only if they override | |
| 412 // a super's method, in which case they re-use its entry | |
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413 (target_method()->is_static()) || |
| 0 | 414 // static methods don't need to be in vtable |
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415 (target_method()->name() == vmSymbols::object_initializer_name()) |
| 0 | 416 // <init> is never called dynamically-bound |
| 417 ) { | |
| 418 return false; | |
| 419 } | |
| 420 | |
| 421 // we need a new entry if there is no superclass | |
| 422 if (super == NULL) { | |
| 423 return true; | |
| 424 } | |
| 425 | |
| 426 // private methods always have a new entry in the vtable | |
|
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427 // specification interpretation since classic has |
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428 // private methods not overriding |
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429 if (target_method()->is_private()) { |
| 0 | 430 return true; |
| 431 } | |
| 432 | |
| 433 // search through the super class hierarchy to see if we need | |
| 434 // a new entry | |
|
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435 ResourceMark rm; |
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436 Symbol* name = target_method()->name(); |
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437 Symbol* signature = target_method()->signature(); |
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438 Klass* k = super; |
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439 Method* super_method = NULL; |
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440 InstanceKlass *holder = NULL; |
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441 Method* recheck_method = NULL; |
| 0 | 442 while (k != NULL) { |
| 443 // lookup through the hierarchy for a method with matching name and sign. | |
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444 super_method = InstanceKlass::cast(k)->lookup_method(name, signature); |
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445 if (super_method == NULL) { |
| 0 | 446 break; // we still have to search for a matching miranda method |
| 447 } | |
| 448 // get the class holding the matching method | |
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449 // make sure you use that class for is_override |
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450 InstanceKlass* superk = InstanceKlass::cast(super_method->method_holder()); |
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451 // we want only instance method matches |
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452 // pretend private methods are not in the super vtable |
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453 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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454 // ignore private, c.m pub does override a.m pub |
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455 // For classes that were not javac'd together, we also do transitive overriding around |
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456 // methods that have less accessibility |
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457 if ((!super_method->is_static()) && |
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458 (!super_method->is_private())) { |
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459 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
| 0 | 460 return false; |
|
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461 // else keep looking for transitive overrides |
| 0 | 462 } |
| 463 } | |
| 464 | |
|
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465 // Start with lookup result and continue to search up |
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466 k = superk->super(); // haven't found an override match yet; continue to look |
| 0 | 467 } |
| 468 | |
| 469 // if the target method is public or protected it may have a matching | |
| 470 // miranda method in the super, whose entry it should re-use. | |
|
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471 // Actually, to handle cases that javac would not generate, we need |
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472 // this check for all access permissions. |
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473 InstanceKlass *sk = InstanceKlass::cast(super); |
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474 if (sk->has_miranda_methods()) { |
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475 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
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476 return false; // found a matching miranda; we do not need a new entry |
| 0 | 477 } |
| 478 } | |
| 479 return true; // found no match; we need a new entry | |
| 480 } | |
| 481 | |
| 482 // Support for miranda methods | |
| 483 | |
| 484 // get the vtable index of a miranda method with matching "name" and "signature" | |
|
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485 int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) { |
| 0 | 486 // search from the bottom, might be faster |
| 487 for (int i = (length() - 1); i >= 0; i--) { | |
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488 Method* m = table()[i].method(); |
| 0 | 489 if (is_miranda_entry_at(i) && |
| 490 m->name() == name && m->signature() == signature) { | |
| 491 return i; | |
| 492 } | |
| 493 } | |
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494 return Method::invalid_vtable_index; |
| 0 | 495 } |
| 496 | |
| 497 // check if an entry is miranda | |
| 498 bool klassVtable::is_miranda_entry_at(int i) { | |
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499 Method* m = method_at(i); |
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500 Klass* method_holder = m->method_holder(); |
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501 InstanceKlass *mhk = InstanceKlass::cast(method_holder); |
| 0 | 502 |
| 503 // miranda methods are interface methods in a class's vtable | |
| 504 if (mhk->is_interface()) { | |
| 505 assert(m->is_public() && m->is_abstract(), "should be public and abstract"); | |
| 506 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); | |
| 507 assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); | |
| 508 return true; | |
| 509 } | |
| 510 return false; | |
| 511 } | |
| 512 | |
| 513 // check if a method is a miranda method, given a class's methods table and it's super | |
| 514 // the caller must make sure that the method belongs to an interface implemented by the class | |
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515 bool klassVtable::is_miranda(Method* m, Array<Method*>* class_methods, Klass* super) { |
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516 Symbol* name = m->name(); |
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517 Symbol* signature = m->signature(); |
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518 if (InstanceKlass::find_method(class_methods, name, signature) == NULL) { |
|
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519 // did not find it in the method table of the current class |
| 0 | 520 if (super == NULL) { |
| 521 // super doesn't exist | |
| 522 return true; | |
|
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523 } |
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524 |
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525 Method* mo = InstanceKlass::cast(super)->lookup_method(name, signature); |
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526 if (mo == NULL || mo->access_flags().is_private() ) { |
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527 // super class hierarchy does not implement it or protection is different |
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528 return true; |
| 0 | 529 } |
| 530 } | |
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531 |
| 0 | 532 return false; |
| 533 } | |
| 534 | |
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535 void klassVtable::add_new_mirandas_to_list(GrowableArray<Method*>* list_of_current_mirandas, |
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536 Array<Method*>* current_interface_methods, |
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537 Array<Method*>* class_methods, |
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538 Klass* super) { |
| 0 | 539 // iterate thru the current interface's method to see if it a miranda |
| 540 int num_methods = current_interface_methods->length(); | |
| 541 for (int i = 0; i < num_methods; i++) { | |
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542 Method* im = current_interface_methods->at(i); |
| 0 | 543 bool is_duplicate = false; |
| 544 int num_of_current_mirandas = list_of_current_mirandas->length(); | |
| 545 // check for duplicate mirandas in different interfaces we implement | |
| 546 for (int j = 0; j < num_of_current_mirandas; j++) { | |
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547 Method* miranda = list_of_current_mirandas->at(j); |
| 0 | 548 if ((im->name() == miranda->name()) && |
| 549 (im->signature() == miranda->signature())) { | |
| 550 is_duplicate = true; | |
| 551 break; | |
| 552 } | |
| 553 } | |
| 554 | |
| 555 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
| 556 if (is_miranda(im, class_methods, super)) { // is it a miranda at all? | |
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557 InstanceKlass *sk = InstanceKlass::cast(super); |
| 0 | 558 // check if it is a duplicate of a super's miranda |
| 559 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { | |
| 560 list_of_current_mirandas->append(im); | |
| 561 } | |
| 562 } | |
| 563 } | |
| 564 } | |
| 565 } | |
| 566 | |
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567 void klassVtable::get_mirandas(GrowableArray<Method*>* mirandas, |
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568 Klass* super, Array<Method*>* class_methods, |
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569 Array<Klass*>* local_interfaces) { |
| 0 | 570 assert((mirandas->length() == 0) , "current mirandas must be 0"); |
| 571 | |
| 572 // iterate thru the local interfaces looking for a miranda | |
| 573 int num_local_ifs = local_interfaces->length(); | |
| 574 for (int i = 0; i < num_local_ifs; i++) { | |
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575 InstanceKlass *ik = InstanceKlass::cast(local_interfaces->at(i)); |
| 0 | 576 add_new_mirandas_to_list(mirandas, ik->methods(), class_methods, super); |
| 577 // iterate thru each local's super interfaces | |
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578 Array<Klass*>* super_ifs = ik->transitive_interfaces(); |
| 0 | 579 int num_super_ifs = super_ifs->length(); |
| 580 for (int j = 0; j < num_super_ifs; j++) { | |
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581 InstanceKlass *sik = InstanceKlass::cast(super_ifs->at(j)); |
| 0 | 582 add_new_mirandas_to_list(mirandas, sik->methods(), class_methods, super); |
| 583 } | |
| 584 } | |
| 585 } | |
| 586 | |
| 587 // get number of mirandas | |
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588 int klassVtable::get_num_mirandas(Klass* super, Array<Method*>* class_methods, Array<Klass*>* local_interfaces) { |
| 0 | 589 ResourceMark rm; |
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590 GrowableArray<Method*>* mirandas = new GrowableArray<Method*>(20); |
| 0 | 591 get_mirandas(mirandas, super, class_methods, local_interfaces); |
| 592 return mirandas->length(); | |
| 593 } | |
| 594 | |
| 595 // fill in mirandas | |
| 596 void klassVtable::fill_in_mirandas(int& initialized) { | |
| 597 ResourceMark rm; | |
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598 GrowableArray<Method*>* mirandas = new GrowableArray<Method*>(20); |
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599 InstanceKlass *this_ik = ik(); |
| 0 | 600 get_mirandas(mirandas, this_ik->super(), this_ik->methods(), this_ik->local_interfaces()); |
| 601 int num_mirandas = mirandas->length(); | |
| 602 for (int i = 0; i < num_mirandas; i++) { | |
| 603 put_method_at(mirandas->at(i), initialized); | |
| 604 initialized++; | |
| 605 } | |
| 606 } | |
| 607 | |
| 608 void klassVtable::copy_vtable_to(vtableEntry* start) { | |
| 609 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
| 610 } | |
| 611 | |
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612 void klassVtable::adjust_method_entries(Method** old_methods, Method** new_methods, |
| 0 | 613 int methods_length, bool * trace_name_printed) { |
| 614 // search the vtable for uses of either obsolete or EMCP methods | |
| 615 for (int j = 0; j < methods_length; j++) { | |
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616 Method* old_method = old_methods[j]; |
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617 Method* new_method = new_methods[j]; |
| 0 | 618 |
| 619 // In the vast majority of cases we could get the vtable index | |
| 620 // by using: old_method->vtable_index() | |
| 621 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
| 622 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
| 623 // vtable, so, alas, we must do an exhaustive search. | |
| 624 for (int index = 0; index < length(); index++) { | |
| 625 if (unchecked_method_at(index) == old_method) { | |
| 626 put_method_at(new_method, index); | |
| 627 | |
| 628 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 629 if (!(*trace_name_printed)) { | |
| 630 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 631 RC_TRACE_MESG(("adjust: name=%s", | |
| 632 Klass::cast(old_method->method_holder())->external_name())); | |
| 633 *trace_name_printed = true; | |
| 634 } | |
| 635 // RC_TRACE macro has an embedded ResourceMark | |
| 636 RC_TRACE(0x00100000, ("vtable method update: %s(%s)", | |
| 637 new_method->name()->as_C_string(), | |
| 638 new_method->signature()->as_C_string())); | |
| 639 } | |
| 640 } | |
| 641 } | |
| 642 } | |
| 643 } | |
| 644 | |
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645 // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
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646 void klassVtable::clear_vtable() { |
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647 for (int i = 0; i < _length; i++) table()[i].clear(); |
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648 } |
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649 |
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650 bool klassVtable::is_initialized() { |
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651 return _length == 0 || table()[0].method() != NULL; |
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652 } |
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653 |
| 0 | 654 //----------------------------------------------------------------------------------------- |
| 655 // Itable code | |
| 656 | |
| 657 // Initialize a itableMethodEntry | |
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658 void itableMethodEntry::initialize(Method* m) { |
| 0 | 659 if (m == NULL) return; |
| 660 | |
| 661 _method = m; | |
| 662 } | |
| 663 | |
| 664 klassItable::klassItable(instanceKlassHandle klass) { | |
| 665 _klass = klass; | |
| 666 | |
| 667 if (klass->itable_length() > 0) { | |
| 668 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
| 669 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
| 670 // First offset entry points to the first method_entry | |
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671 intptr_t* method_entry = (intptr_t *)(((address)klass()) + offset_entry->offset()); |
| 0 | 672 intptr_t* end = klass->end_of_itable(); |
| 673 | |
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674 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass(); |
| 0 | 675 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); |
| 676 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
| 677 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
| 678 return; | |
| 679 } | |
| 680 } | |
| 681 | |
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682 // The length of the itable was either zero, or it has not yet been initialized. |
| 0 | 683 _table_offset = 0; |
| 684 _size_offset_table = 0; | |
| 685 _size_method_table = 0; | |
| 686 } | |
| 687 | |
| 688 static int initialize_count = 0; | |
| 689 | |
| 690 // Initialization | |
| 691 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
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692 // Cannot be setup doing bootstrapping, interfaces don't have |
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693 // itables, and klass with only ones entry have empty itables |
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694 if (Universe::is_bootstrapping() || |
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695 _klass->is_interface() || |
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696 _klass->itable_length() == itableOffsetEntry::size()) return; |
| 0 | 697 |
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698 // There's alway an extra itable entry so we can null-terminate it. |
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699 guarantee(size_offset_table() >= 1, "too small"); |
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700 int num_interfaces = size_offset_table() - 1; |
| 0 | 701 if (num_interfaces > 0) { |
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702 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
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703 _klass->name()->as_C_string()); |
| 0 | 704 |
| 705 | |
|
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706 // Iterate through all interfaces |
| 0 | 707 int i; |
| 708 for(i = 0; i < num_interfaces; i++) { | |
| 709 itableOffsetEntry* ioe = offset_entry(i); | |
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710 HandleMark hm(THREAD); |
| 0 | 711 KlassHandle interf_h (THREAD, ioe->interface_klass()); |
| 712 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
| 713 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
| 714 } | |
| 715 | |
| 716 } | |
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717 // Check that the last entry is empty |
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718 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
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719 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
| 0 | 720 } |
| 721 | |
| 722 | |
| 723 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { | |
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724 Array<Method*>* methods = InstanceKlass::cast(interf_h())->methods(); |
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725 int nof_methods = methods->length(); |
| 0 | 726 HandleMark hm; |
| 727 KlassHandle klass = _klass; | |
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728 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
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729 Handle interface_loader (THREAD, InstanceKlass::cast(interf_h())->class_loader()); |
| 0 | 730 int ime_num = 0; |
| 731 | |
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732 // Skip first Method* if it is a class initializer |
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733 int i = methods->at(0)->is_static_initializer() ? 1 : 0; |
| 0 | 734 |
| 735 // m, method_name, method_signature, klass reset each loop so they | |
| 736 // don't need preserving across check_signature_loaders call | |
| 737 // methods needs a handle in case of gc from check_signature_loaders | |
| 738 for(; i < nof_methods; i++) { | |
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739 Method* m = methods->at(i); |
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740 Symbol* method_name = m->name(); |
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741 Symbol* method_signature = m->signature(); |
| 0 | 742 |
| 743 // This is same code as in Linkresolver::lookup_instance_method_in_klasses | |
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744 Method* target = klass->uncached_lookup_method(method_name, method_signature); |
| 0 | 745 while (target != NULL && target->is_static()) { |
| 746 // continue with recursive lookup through the superclass | |
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747 Klass* super = Klass::cast(target->method_holder())->super(); |
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748 target = (super == NULL) ? (Method*)NULL : Klass::cast(super)->uncached_lookup_method(method_name, method_signature); |
| 0 | 749 } |
| 750 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
| 751 // Entry do not resolve. Leave it empty | |
| 752 } else { | |
| 753 // Entry did resolve, check loader constraints before initializing | |
| 754 // if checkconstraints requested | |
| 755 methodHandle target_h (THREAD, target); // preserve across gc | |
| 756 if (checkconstraints) { | |
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757 Handle method_holder_loader (THREAD, InstanceKlass::cast(target->method_holder())->class_loader()); |
| 0 | 758 if (method_holder_loader() != interface_loader()) { |
| 759 ResourceMark rm(THREAD); | |
| 760 char* failed_type_name = | |
| 761 SystemDictionary::check_signature_loaders(method_signature, | |
| 762 method_holder_loader, | |
| 763 interface_loader, | |
| 764 true, CHECK); | |
| 765 if (failed_type_name != NULL) { | |
| 766 const char* msg = "loader constraint violation in interface " | |
| 767 "itable initialization: when resolving method \"%s\" the class" | |
| 768 " loader (instance of %s) of the current class, %s, " | |
| 769 "and the class loader (instance of %s) for interface " | |
| 770 "%s have different Class objects for the type %s " | |
| 771 "used in the signature"; | |
| 772 char* sig = target_h()->name_and_sig_as_C_string(); | |
| 773 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); | |
| 774 char* current = klass->name()->as_C_string(); | |
| 775 const char* loader2 = SystemDictionary::loader_name(interface_loader()); | |
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776 char* iface = InstanceKlass::cast(interf_h())->name()->as_C_string(); |
| 0 | 777 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
| 778 strlen(current) + strlen(loader2) + strlen(iface) + | |
| 779 strlen(failed_type_name); | |
| 780 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 781 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 782 iface, failed_type_name); | |
| 783 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 784 } | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 // ime may have moved during GC so recalculate address | |
| 789 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); | |
| 790 } | |
| 791 // Progress to next entry | |
| 792 ime_num++; | |
| 793 } | |
| 794 } | |
| 795 | |
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796 // Update entry for specific Method* |
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797 void klassItable::initialize_with_method(Method* m) { |
| 0 | 798 itableMethodEntry* ime = method_entry(0); |
| 799 for(int i = 0; i < _size_method_table; i++) { | |
| 800 if (ime->method() == m) { | |
| 801 ime->initialize(m); | |
| 802 } | |
| 803 ime++; | |
| 804 } | |
| 805 } | |
| 806 | |
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807 void klassItable::adjust_method_entries(Method** old_methods, Method** new_methods, |
| 0 | 808 int methods_length, bool * trace_name_printed) { |
| 809 // search the itable for uses of either obsolete or EMCP methods | |
| 810 for (int j = 0; j < methods_length; j++) { | |
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811 Method* old_method = old_methods[j]; |
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812 Method* new_method = new_methods[j]; |
| 0 | 813 itableMethodEntry* ime = method_entry(0); |
| 814 | |
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815 // The itable can describe more than one interface and the same |
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816 // method signature can be specified by more than one interface. |
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817 // This means we have to do an exhaustive search to find all the |
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818 // old_method references. |
| 0 | 819 for (int i = 0; i < _size_method_table; i++) { |
| 820 if (ime->method() == old_method) { | |
| 821 ime->initialize(new_method); | |
| 822 | |
| 823 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 824 if (!(*trace_name_printed)) { | |
| 825 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 826 RC_TRACE_MESG(("adjust: name=%s", | |
| 827 Klass::cast(old_method->method_holder())->external_name())); | |
| 828 *trace_name_printed = true; | |
| 829 } | |
| 830 // RC_TRACE macro has an embedded ResourceMark | |
| 831 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
| 832 new_method->name()->as_C_string(), | |
| 833 new_method->signature()->as_C_string())); | |
| 834 } | |
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835 // Cannot break because there might be another entry for this method |
| 0 | 836 } |
| 837 ime++; | |
| 838 } | |
| 839 } | |
| 840 } | |
| 841 | |
| 842 | |
| 843 // Setup | |
| 844 class InterfaceVisiterClosure : public StackObj { | |
| 845 public: | |
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846 virtual void doit(Klass* intf, int method_count) = 0; |
| 0 | 847 }; |
| 848 | |
| 849 // Visit all interfaces with at-least one method (excluding <clinit>) | |
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850 void visit_all_interfaces(Array<Klass*>* transitive_intf, InterfaceVisiterClosure *blk) { |
| 0 | 851 // Handle array argument |
| 852 for(int i = 0; i < transitive_intf->length(); i++) { | |
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853 Klass* intf = transitive_intf->at(i); |
| 0 | 854 assert(Klass::cast(intf)->is_interface(), "sanity check"); |
| 855 | |
| 856 // Find no. of methods excluding a <clinit> | |
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857 int method_count = InstanceKlass::cast(intf)->methods()->length(); |
| 0 | 858 if (method_count > 0) { |
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859 Method* m = InstanceKlass::cast(intf)->methods()->at(0); |
| 0 | 860 assert(m != NULL && m->is_method(), "sanity check"); |
| 861 if (m->name() == vmSymbols::object_initializer_name()) { | |
| 862 method_count--; | |
| 863 } | |
| 864 } | |
| 865 | |
| 866 // Only count interfaces with at least one method | |
| 867 if (method_count > 0) { | |
| 868 blk->doit(intf, method_count); | |
| 869 } | |
| 870 } | |
| 871 } | |
| 872 | |
| 873 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
| 874 private: | |
| 875 int _nof_methods; | |
| 876 int _nof_interfaces; | |
| 877 public: | |
| 878 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
| 879 | |
| 880 int nof_methods() const { return _nof_methods; } | |
| 881 int nof_interfaces() const { return _nof_interfaces; } | |
| 882 | |
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883 void doit(Klass* intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } |
| 0 | 884 }; |
| 885 | |
| 886 class SetupItableClosure : public InterfaceVisiterClosure { | |
| 887 private: | |
| 888 itableOffsetEntry* _offset_entry; | |
| 889 itableMethodEntry* _method_entry; | |
| 890 address _klass_begin; | |
| 891 public: | |
| 892 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
| 893 _klass_begin = klass_begin; | |
| 894 _offset_entry = offset_entry; | |
| 895 _method_entry = method_entry; | |
| 896 } | |
| 897 | |
| 898 itableMethodEntry* method_entry() const { return _method_entry; } | |
| 899 | |
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900 void doit(Klass* intf, int method_count) { |
| 0 | 901 int offset = ((address)_method_entry) - _klass_begin; |
| 902 _offset_entry->initialize(intf, offset); | |
| 903 _offset_entry++; | |
| 904 _method_entry += method_count; | |
| 905 } | |
| 906 }; | |
| 907 | |
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908 int klassItable::compute_itable_size(Array<Klass*>* transitive_interfaces) { |
| 0 | 909 // Count no of interfaces and total number of interface methods |
| 910 CountInterfacesClosure cic; | |
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911 visit_all_interfaces(transitive_interfaces, &cic); |
| 0 | 912 |
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913 // There's alway an extra itable entry so we can null-terminate it. |
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914 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
| 0 | 915 |
| 916 // Statistics | |
| 917 update_stats(itable_size * HeapWordSize); | |
| 918 | |
| 919 return itable_size; | |
| 920 } | |
| 921 | |
| 922 | |
| 923 // Fill out offset table and interface klasses into the itable space | |
| 924 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
| 925 if (klass->itable_length() == 0) return; | |
| 926 assert(!klass->is_interface(), "Should have zero length itable"); | |
| 927 | |
| 928 // Count no of interfaces and total number of interface methods | |
| 929 CountInterfacesClosure cic; | |
| 930 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
| 931 int nof_methods = cic.nof_methods(); | |
| 932 int nof_interfaces = cic.nof_interfaces(); | |
| 933 | |
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934 // Add one extra entry so we can null-terminate the table |
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935 nof_interfaces++; |
| 0 | 936 |
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937 assert(compute_itable_size(klass->transitive_interfaces()) == |
| 0 | 938 calc_itable_size(nof_interfaces, nof_methods), |
| 939 "mismatch calculation of itable size"); | |
| 940 | |
| 941 // Fill-out offset table | |
| 942 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
| 943 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
| 944 intptr_t* end = klass->end_of_itable(); | |
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945 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)"); |
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946 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
| 0 | 947 |
| 948 // Visit all interfaces and initialize itable offset table | |
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949 SetupItableClosure sic((address)klass(), ioe, ime); |
| 0 | 950 visit_all_interfaces(klass->transitive_interfaces(), &sic); |
| 951 | |
| 952 #ifdef ASSERT | |
| 953 ime = sic.method_entry(); | |
| 954 oop* v = (oop*) klass->end_of_itable(); | |
| 955 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
| 956 #endif | |
| 957 } | |
| 958 | |
| 959 | |
| 960 // m must be a method in an interface | |
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961 int klassItable::compute_itable_index(Method* m) { |
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962 Klass* intf = m->method_holder(); |
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963 assert(InstanceKlass::cast(intf)->is_interface(), "sanity check"); |
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964 Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
| 0 | 965 int index = 0; |
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966 while(methods->at(index) != m) { |
| 0 | 967 index++; |
| 968 assert(index < methods->length(), "should find index for resolve_invoke"); | |
| 969 } | |
| 970 // Adjust for <clinit>, which is left out of table if first method | |
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971 if (methods->length() > 0 && methods->at(0)->is_static_initializer()) { |
| 0 | 972 index--; |
| 973 } | |
| 974 return index; | |
| 975 } | |
| 976 | |
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977 |
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978 // inverse to compute_itable_index |
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979 Method* klassItable::method_for_itable_index(Klass* intf, int itable_index) { |
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980 assert(InstanceKlass::cast(intf)->is_interface(), "sanity check"); |
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981 Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
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982 |
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983 int index = itable_index; |
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984 // Adjust for <clinit>, which is left out of table if first method |
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985 if (methods->length() > 0 && methods->at(0)->is_static_initializer()) { |
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986 index++; |
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987 } |
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988 |
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989 if (itable_index < 0 || index >= methods->length()) |
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990 return NULL; // help caller defend against bad indexes |
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991 |
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992 Method* m = methods->at(index); |
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993 assert(compute_itable_index(m) == itable_index, "correct inverse"); |
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994 |
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995 return m; |
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996 } |
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997 |
| 0 | 998 void klassVtable::verify(outputStream* st, bool forced) { |
| 999 // make sure table is initialized | |
| 1000 if (!Universe::is_fully_initialized()) return; | |
| 1001 #ifndef PRODUCT | |
| 1002 // avoid redundant verifies | |
| 1003 if (!forced && _verify_count == Universe::verify_count()) return; | |
| 1004 _verify_count = Universe::verify_count(); | |
| 1005 #endif | |
| 1006 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 1007 oop* end_of_vtable = (oop *)&table()[_length]; | |
| 1008 if (end_of_vtable > end_of_obj) { | |
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1009 fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
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1010 "end)", _klass->internal_name())); |
| 0 | 1011 } |
| 1012 | |
| 1013 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
| 1014 // verify consistency with superKlass vtable | |
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1015 Klass* super = _klass->super(); |
| 0 | 1016 if (super != NULL) { |
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1017 InstanceKlass* sk = InstanceKlass::cast(super); |
| 0 | 1018 klassVtable* vt = sk->vtable(); |
| 1019 for (int i = 0; i < vt->length(); i++) { | |
| 1020 verify_against(st, vt, i); | |
| 1021 } | |
| 1022 } | |
| 1023 } | |
| 1024 | |
| 1025 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
| 1026 vtableEntry* vte = &vt->table()[index]; | |
| 1027 if (vte->method()->name() != table()[index].method()->name() || | |
| 1028 vte->method()->signature() != table()[index].method()->signature()) { | |
| 1029 fatal("mismatched name/signature of vtable entries"); | |
| 1030 } | |
| 1031 } | |
| 1032 | |
| 1033 #ifndef PRODUCT | |
| 1034 void klassVtable::print() { | |
| 1035 ResourceMark rm; | |
| 1036 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
| 1037 for (int i = 0; i < length(); i++) { | |
| 1038 table()[i].print(); | |
| 1039 tty->cr(); | |
| 1040 } | |
| 1041 } | |
| 1042 #endif | |
| 1043 | |
| 1044 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
| 1045 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
| 1046 assert(method() != NULL, "must have set method"); | |
| 1047 method()->verify(); | |
| 1048 // we sub_type, because it could be a miranda method | |
| 1049 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
| 1050 #ifndef PRODUCT | |
| 1051 print(); | |
| 1052 #endif | |
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1053 fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
| 0 | 1054 } |
| 1055 } | |
| 1056 | |
| 1057 #ifndef PRODUCT | |
| 1058 | |
| 1059 void vtableEntry::print() { | |
| 1060 ResourceMark rm; | |
| 1061 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
| 1062 if (Verbose) { | |
| 1063 tty->print("m %#lx ", (address)method()); | |
| 1064 } | |
| 1065 } | |
| 1066 | |
| 1067 class VtableStats : AllStatic { | |
| 1068 public: | |
| 1069 static int no_klasses; // # classes with vtables | |
| 1070 static int no_array_klasses; // # array classes | |
| 1071 static int no_instance_klasses; // # instanceKlasses | |
| 1072 static int sum_of_vtable_len; // total # of vtable entries | |
| 1073 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
| 1074 static int fixed; // total fixed overhead in bytes | |
| 1075 static int filler; // overhead caused by filler bytes | |
| 1076 static int entries; // total bytes consumed by vtable entries | |
| 1077 static int array_entries; // total bytes consumed by array vtable entries | |
| 1078 | |
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1079 static void do_class(Klass* k) { |
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1080 Klass* kl = k; |
| 0 | 1081 klassVtable* vt = kl->vtable(); |
| 1082 if (vt == NULL) return; | |
| 1083 no_klasses++; | |
| 1084 if (kl->oop_is_instance()) { | |
| 1085 no_instance_klasses++; | |
| 1086 kl->array_klasses_do(do_class); | |
| 1087 } | |
| 1088 if (kl->oop_is_array()) { | |
| 1089 no_array_klasses++; | |
| 1090 sum_of_array_vtable_len += vt->length(); | |
| 1091 } | |
| 1092 sum_of_vtable_len += vt->length(); | |
| 1093 } | |
| 1094 | |
| 1095 static void compute() { | |
| 1096 SystemDictionary::classes_do(do_class); | |
| 1097 fixed = no_klasses * oopSize; // vtable length | |
| 1098 // filler size is a conservative approximation | |
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1099 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(InstanceKlass) - sizeof(arrayKlass) - 1); |
| 0 | 1100 entries = sizeof(vtableEntry) * sum_of_vtable_len; |
| 1101 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
| 1102 } | |
| 1103 }; | |
| 1104 | |
| 1105 int VtableStats::no_klasses = 0; | |
| 1106 int VtableStats::no_array_klasses = 0; | |
| 1107 int VtableStats::no_instance_klasses = 0; | |
| 1108 int VtableStats::sum_of_vtable_len = 0; | |
| 1109 int VtableStats::sum_of_array_vtable_len = 0; | |
| 1110 int VtableStats::fixed = 0; | |
| 1111 int VtableStats::filler = 0; | |
| 1112 int VtableStats::entries = 0; | |
| 1113 int VtableStats::array_entries = 0; | |
| 1114 | |
| 1115 void klassVtable::print_statistics() { | |
| 1116 ResourceMark rm; | |
| 1117 HandleMark hm; | |
| 1118 VtableStats::compute(); | |
| 1119 tty->print_cr("vtable statistics:"); | |
| 1120 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
| 1121 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
| 1122 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
| 1123 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
| 1124 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
| 1125 tty->print_cr("%6d bytes total", total); | |
| 1126 } | |
| 1127 | |
| 1128 bool klassVtable::check_no_old_entries() { | |
| 1129 // Check that there really is no entry | |
| 1130 for (int i = 0; i < length(); i++) { | |
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1131 Method* m = unchecked_method_at(i); |
| 0 | 1132 if (m != NULL) { |
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1133 if (!m->is_valid() || m->is_old()) { |
| 0 | 1134 return false; |
| 1135 } | |
| 1136 } | |
| 1137 } | |
| 1138 return true; | |
| 1139 } | |
| 1140 | |
| 1141 void klassVtable::dump_vtable() { | |
| 1142 tty->print_cr("vtable dump --"); | |
| 1143 for (int i = 0; i < length(); i++) { | |
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1144 Method* m = unchecked_method_at(i); |
| 0 | 1145 if (m != NULL) { |
| 1146 tty->print(" (%5d) ", i); | |
| 1147 m->access_flags().print_on(tty); | |
| 1148 tty->print(" -- "); | |
| 1149 m->print_name(tty); | |
| 1150 tty->cr(); | |
| 1151 } | |
| 1152 } | |
| 1153 } | |
| 1154 | |
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1155 bool klassItable::check_no_old_entries() { |
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1156 itableMethodEntry* ime = method_entry(0); |
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1157 for(int i = 0; i < _size_method_table; i++) { |
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1158 Method* m = ime->method(); |
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1159 if (m != NULL && (!m->is_valid() || m->is_old())) return false; |
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1160 ime++; |
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1161 } |
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1162 return true; |
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1163 } |
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1164 |
| 0 | 1165 int klassItable::_total_classes; // Total no. of classes with itables |
| 1166 long klassItable::_total_size; // Total no. of bytes used for itables | |
| 1167 | |
| 1168 void klassItable::print_statistics() { | |
| 1169 tty->print_cr("itable statistics:"); | |
| 1170 tty->print_cr("%6d classes with itables", _total_classes); | |
| 1171 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
| 1172 } | |
| 1173 | |
| 1174 #endif // PRODUCT |