Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.cpp @ 2376:c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
Reviewed-by: kvn, coleenp, twisti, stefank
| author | never |
|---|---|
| date | Fri, 18 Mar 2011 16:00:34 -0700 |
| parents | dbad0519a1c4 |
| children | 8ce625481709 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2227 | 2 * Copyright (c) 1997, 2011, 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/klassOop.hpp" | |
| 34 #include "oops/klassVtable.hpp" | |
| 35 #include "oops/methodOop.hpp" | |
| 36 #include "oops/objArrayOop.hpp" | |
| 37 #include "oops/oop.inline.hpp" | |
| 38 #include "prims/jvmtiRedefineClassesTrace.hpp" | |
| 39 #include "runtime/arguments.hpp" | |
| 40 #include "runtime/handles.inline.hpp" | |
| 41 #include "utilities/copy.hpp" | |
| 0 | 42 |
| 43 inline instanceKlass* klassVtable::ik() const { | |
| 44 Klass* k = _klass()->klass_part(); | |
| 45 assert(k->oop_is_instance(), "not an instanceKlass"); | |
| 46 return (instanceKlass*)k; | |
| 47 } | |
| 48 | |
| 49 | |
| 50 // this function computes the vtable size (including the size needed for miranda | |
| 51 // methods) and the number of miranda methods in this class | |
| 52 // Note on Miranda methods: Let's say there is a class C that implements | |
| 53 // interface I. Let's say there is a method m in I that neither C nor any | |
| 54 // of its super classes implement (i.e there is no method of any access, with | |
| 55 // the same name and signature as m), then m is a Miranda method which is | |
| 56 // entered as a public abstract method in C's vtable. From then on it should | |
| 57 // treated as any other public method in C for method over-ride purposes. | |
| 58 void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length, | |
| 59 int &num_miranda_methods, | |
| 60 klassOop super, | |
| 61 objArrayOop methods, | |
| 62 AccessFlags class_flags, | |
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63 Handle classloader, |
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64 Symbol* classname, |
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65 objArrayOop local_interfaces, |
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66 TRAPS |
| 0 | 67 ) { |
| 68 | |
| 69 No_Safepoint_Verifier nsv; | |
| 70 | |
| 71 // set up default result values | |
| 72 vtable_length = 0; | |
| 73 num_miranda_methods = 0; | |
| 74 | |
| 75 // start off with super's vtable length | |
| 76 instanceKlass* sk = (instanceKlass*)super->klass_part(); | |
| 77 vtable_length = super == NULL ? 0 : sk->vtable_length(); | |
| 78 | |
| 79 // go thru each method in the methods table to see if it needs a new entry | |
| 80 int len = methods->length(); | |
| 81 for (int i = 0; i < len; i++) { | |
| 82 assert(methods->obj_at(i)->is_method(), "must be a methodOop"); | |
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83 methodHandle mh(THREAD, methodOop(methods->obj_at(i))); |
| 0 | 84 |
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85 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
| 0 | 86 vtable_length += vtableEntry::size(); // we need a new entry |
| 87 } | |
| 88 } | |
| 89 | |
| 90 // compute the number of mirandas methods that must be added to the end | |
| 91 num_miranda_methods = get_num_mirandas(super, methods, local_interfaces); | |
| 92 vtable_length += (num_miranda_methods * vtableEntry::size()); | |
| 93 | |
| 94 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
| 95 // array classes don't have their superclass set correctly during | |
| 96 // bootstrapping | |
| 97 vtable_length = Universe::base_vtable_size(); | |
| 98 } | |
| 99 | |
| 100 if (super == NULL && !Universe::is_bootstrapping() && | |
| 101 vtable_length != Universe::base_vtable_size()) { | |
| 102 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
| 103 // only way this should happen is from | |
| 104 // SystemDictionary::resolve_from_stream(), which will detect this later | |
| 105 // and throw a security exception. So don't assert here to let | |
| 106 // the exception occur. | |
| 107 vtable_length = Universe::base_vtable_size(); | |
| 108 } | |
| 109 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
| 110 "bad vtable size for class Object"); | |
| 111 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
| 112 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
| 113 } | |
| 114 | |
| 115 int klassVtable::index_of(methodOop m, int len) const { | |
| 116 assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); | |
| 117 return m->vtable_index(); | |
| 118 } | |
| 119 | |
| 120 int klassVtable::initialize_from_super(KlassHandle super) { | |
| 121 if (super.is_null()) { | |
| 122 return 0; | |
| 123 } else { | |
| 124 // copy methods from superKlass | |
| 125 // can't inherit from array class, so must be instanceKlass | |
| 126 assert(super->oop_is_instance(), "must be instance klass"); | |
| 127 instanceKlass* sk = (instanceKlass*)super()->klass_part(); | |
| 128 klassVtable* superVtable = sk->vtable(); | |
| 129 assert(superVtable->length() <= _length, "vtable too short"); | |
| 130 #ifdef ASSERT | |
| 131 superVtable->verify(tty, true); | |
| 132 #endif | |
| 133 superVtable->copy_vtable_to(table()); | |
| 134 #ifndef PRODUCT | |
| 135 if (PrintVtables && Verbose) { | |
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136 ResourceMark rm; |
| 0 | 137 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
| 138 } | |
| 139 #endif | |
| 140 return superVtable->length(); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // Revised lookup semantics introduced 1.3 (Kestral beta) | |
| 145 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { | |
| 146 | |
| 147 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
| 148 KlassHandle super (THREAD, klass()->java_super()); | |
| 149 int nofNewEntries = 0; | |
| 150 | |
| 151 | |
| 152 if (PrintVtables && !klass()->oop_is_array()) { | |
| 153 ResourceMark rm(THREAD); | |
| 154 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
| 155 } | |
| 156 | |
| 157 #ifdef ASSERT | |
| 158 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 159 oop* end_of_vtable = (oop*)&table()[_length]; | |
| 160 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
| 161 #endif | |
| 162 | |
| 163 if (Universe::is_bootstrapping()) { | |
| 164 // just clear everything | |
| 165 for (int i = 0; i < _length; i++) table()[i].clear(); | |
| 166 return; | |
| 167 } | |
| 168 | |
| 169 int super_vtable_len = initialize_from_super(super); | |
| 170 if (klass()->oop_is_array()) { | |
| 171 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
| 172 } else { | |
| 173 assert(_klass->oop_is_instance(), "must be instanceKlass"); | |
| 174 | |
| 175 objArrayHandle methods(THREAD, ik()->methods()); | |
| 176 int len = methods()->length(); | |
| 177 int initialized = super_vtable_len; | |
| 178 | |
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179 // update_inherited_vtable can stop for gc - ensure using handles |
| 0 | 180 for (int i = 0; i < len; i++) { |
| 181 HandleMark hm(THREAD); | |
| 182 assert(methods()->obj_at(i)->is_method(), "must be a methodOop"); | |
| 183 methodHandle mh(THREAD, (methodOop)methods()->obj_at(i)); | |
| 184 | |
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185 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
| 0 | 186 |
| 187 if (needs_new_entry) { | |
| 188 put_method_at(mh(), initialized); | |
| 189 mh()->set_vtable_index(initialized); // set primary vtable index | |
| 190 initialized++; | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 // add miranda methods; it will also update the value of initialized | |
| 195 fill_in_mirandas(initialized); | |
| 196 | |
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197 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
| 0 | 198 // package_private -> publicprotected), the vtable might actually be smaller than our initial |
| 199 // calculation. | |
| 200 assert(initialized <= _length, "vtable initialization failed"); | |
| 201 for(;initialized < _length; initialized++) { | |
| 202 put_method_at(NULL, initialized); | |
| 203 } | |
| 204 NOT_PRODUCT(verify(tty, true)); | |
| 205 } | |
| 206 } | |
| 207 | |
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208 // Called for cases where a method does not override its superclass' vtable entry |
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209 // For bytecodes not produced by javac together it is possible that a method does not override |
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210 // the superclass's method, but might indirectly override a super-super class's vtable entry |
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211 // If none found, return a null superk, else return the superk of the method this does override |
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212 instanceKlass* klassVtable::find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, |
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213 int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) { |
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214 instanceKlass* superk = initialsuper; |
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215 while (superk != NULL && superk->super() != NULL) { |
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216 instanceKlass* supersuperklass = instanceKlass::cast(superk->super()); |
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217 klassVtable* ssVtable = supersuperklass->vtable(); |
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218 if (vtable_index < ssVtable->length()) { |
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219 methodOop super_method = ssVtable->method_at(vtable_index); |
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220 #ifndef PRODUCT |
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221 Symbol* name= target_method()->name(); |
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222 Symbol* signature = target_method()->signature(); |
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223 assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch"); |
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224 #endif |
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225 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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226 #ifndef PRODUCT |
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227 if (PrintVtables && Verbose) { |
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228 ResourceMark rm(THREAD); |
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229 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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230 supersuperklass->internal_name(), |
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231 _klass->internal_name(), (target_method() != NULL) ? |
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232 target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
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233 super_method->access_flags().print_on(tty); |
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234 tty->print("overriders flags: "); |
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235 target_method->access_flags().print_on(tty); |
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236 tty->cr(); |
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237 } |
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238 #endif /*PRODUCT*/ |
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239 break; // return found superk |
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240 } |
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241 } else { |
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242 // super class has no vtable entry here, stop transitive search |
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243 superk = (instanceKlass*)NULL; |
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244 break; |
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245 } |
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246 // if no override found yet, continue to search up |
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247 superk = instanceKlass::cast(superk->super()); |
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248 } |
| 0 | 249 |
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250 return superk; |
| 0 | 251 } |
| 252 | |
| 253 | |
| 254 // Update child's copy of super vtable for overrides | |
| 255 // OR return true if a new vtable entry is required | |
| 256 // Only called for instanceKlass's, i.e. not for arrays | |
| 257 // If that changed, could not use _klass as handle for klass | |
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258 bool klassVtable::update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, |
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259 bool checkconstraints, TRAPS) { |
| 0 | 260 ResourceMark rm; |
| 261 bool allocate_new = true; | |
| 262 assert(klass->oop_is_instance(), "must be instanceKlass"); | |
| 263 | |
| 264 // Initialize the method's vtable index to "nonvirtual". | |
| 265 // If we allocate a vtable entry, we will update it to a non-negative number. | |
| 266 target_method()->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); | |
| 267 | |
| 268 // Static and <init> methods are never in | |
| 269 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
| 270 return false; | |
| 271 } | |
| 272 | |
| 273 if (klass->is_final() || target_method()->is_final()) { | |
| 274 // a final method never needs a new entry; final methods can be statically | |
| 275 // resolved and they have to be present in the vtable only if they override | |
| 276 // a super's method, in which case they re-use its entry | |
| 277 allocate_new = false; | |
| 278 } | |
| 279 | |
| 280 // we need a new entry if there is no superclass | |
| 281 if (klass->super() == NULL) { | |
| 282 return allocate_new; | |
| 283 } | |
| 284 | |
| 285 // private methods always have a new entry in the vtable | |
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286 // specification interpretation since classic has |
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287 // private methods not overriding |
| 0 | 288 if (target_method()->is_private()) { |
| 289 return allocate_new; | |
| 290 } | |
| 291 | |
| 292 // search through the vtable and update overridden entries | |
| 293 // Since check_signature_loaders acquires SystemDictionary_lock | |
|
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294 // which can block for gc, once we are in this loop, use handles |
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295 // For classfiles built with >= jdk7, we now look for transitive overrides |
| 0 | 296 |
|
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297 Symbol* name = target_method()->name(); |
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298 Symbol* signature = target_method()->signature(); |
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299 Handle target_loader(THREAD, _klass->class_loader()); |
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300 Symbol* target_classname = _klass->name(); |
| 0 | 301 for(int i = 0; i < super_vtable_len; i++) { |
|
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302 methodOop super_method = method_at(i); |
| 0 | 303 // Check if method name matches |
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304 if (super_method->name() == name && super_method->signature() == signature) { |
| 0 | 305 |
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306 // get super_klass for method_holder for the found method |
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307 instanceKlass* super_klass = instanceKlass::cast(super_method->method_holder()); |
| 0 | 308 |
|
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309 if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
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310 ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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311 && ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
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312 target_classname, THREAD)) != (instanceKlass*)NULL))) { |
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313 // overriding, so no new entry |
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314 allocate_new = false; |
| 0 | 315 |
| 316 if (checkconstraints) { | |
| 317 // Override vtable entry if passes loader constraint check | |
| 318 // if loader constraint checking requested | |
| 319 // No need to visit his super, since he and his super | |
| 320 // have already made any needed loader constraints. | |
| 321 // Since loader constraints are transitive, it is enough | |
| 322 // to link to the first super, and we get all the others. | |
| 323 Handle super_loader(THREAD, super_klass->class_loader()); | |
| 324 | |
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325 if (target_loader() != super_loader()) { |
| 0 | 326 ResourceMark rm(THREAD); |
| 327 char* failed_type_name = | |
|
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328 SystemDictionary::check_signature_loaders(signature, target_loader, |
| 0 | 329 super_loader, true, |
| 330 CHECK_(false)); | |
| 331 if (failed_type_name != NULL) { | |
| 332 const char* msg = "loader constraint violation: when resolving " | |
| 333 "overridden method \"%s\" the class loader (instance" | |
| 334 " of %s) of the current class, %s, and its superclass loader " | |
| 335 "(instance of %s), have different Class objects for the type " | |
| 336 "%s used in the signature"; | |
| 337 char* sig = target_method()->name_and_sig_as_C_string(); | |
|
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338 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
| 0 | 339 char* current = _klass->name()->as_C_string(); |
| 340 const char* loader2 = SystemDictionary::loader_name(super_loader()); | |
| 341 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
| 342 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
| 343 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 344 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 345 failed_type_name); | |
| 346 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
| 347 } | |
| 348 } | |
|
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349 } |
| 0 | 350 |
|
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351 put_method_at(target_method(), i); |
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352 target_method()->set_vtable_index(i); |
| 0 | 353 #ifndef PRODUCT |
|
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354 if (PrintVtables && Verbose) { |
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355 tty->print("overriding with %s::%s index %d, original flags: ", |
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356 _klass->internal_name(), (target_method() != NULL) ? |
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357 target_method()->name()->as_C_string() : "<NULL>", i); |
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358 super_method->access_flags().print_on(tty); |
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359 tty->print("overriders flags: "); |
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360 target_method->access_flags().print_on(tty); |
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361 tty->cr(); |
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362 } |
| 0 | 363 #endif /*PRODUCT*/ |
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364 } else { |
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365 // allocate_new = true; default. We might override one entry, |
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366 // but not override another. Once we override one, not need new |
| 0 | 367 #ifndef PRODUCT |
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368 if (PrintVtables && Verbose) { |
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369 tty->print("NOT overriding with %s::%s index %d, original flags: ", |
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370 _klass->internal_name(), (target_method() != NULL) ? |
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371 target_method()->name()->as_C_string() : "<NULL>", i); |
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372 super_method->access_flags().print_on(tty); |
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373 tty->print("overriders flags: "); |
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374 target_method->access_flags().print_on(tty); |
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375 tty->cr(); |
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376 } |
| 0 | 377 #endif /*PRODUCT*/ |
| 378 } | |
| 379 } | |
| 380 } | |
| 381 return allocate_new; | |
| 382 } | |
| 383 | |
| 384 void klassVtable::put_method_at(methodOop m, int index) { | |
| 385 assert(m->is_oop_or_null(), "Not an oop or null"); | |
| 386 #ifndef PRODUCT | |
| 387 if (PrintVtables && Verbose) { | |
|
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388 ResourceMark rm; |
| 0 | 389 tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
| 390 (m != NULL) ? m->name()->as_C_string() : "<NULL>", index); | |
| 391 } | |
| 392 assert(unchecked_method_at(index)->is_oop_or_null(), "Not an oop or null"); | |
| 393 #endif | |
| 394 table()[index].set(m); | |
| 395 } | |
| 396 | |
| 397 // Find out if a method "m" with superclass "super", loader "classloader" and | |
| 398 // name "classname" needs a new vtable entry. Let P be a class package defined | |
| 399 // by "classloader" and "classname". | |
| 400 // NOTE: The logic used here is very similar to the one used for computing | |
| 401 // the vtables indices for a method. We cannot directly use that function because, | |
|
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402 // we allocate the instanceKlass at load time, and that requires that the |
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403 // superclass has been loaded. |
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404 // However, the vtable entries are filled in at link time, and therefore |
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405 // the superclass' vtable may not yet have been filled in. |
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406 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
| 0 | 407 klassOop super, |
|
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408 Handle classloader, |
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409 Symbol* classname, |
|
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410 AccessFlags class_flags, |
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411 TRAPS) { |
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412 if ((class_flags.is_final() || target_method()->is_final()) || |
| 0 | 413 // a final method never needs a new entry; final methods can be statically |
| 414 // resolved and they have to be present in the vtable only if they override | |
| 415 // a super's method, in which case they re-use its entry | |
|
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416 (target_method()->is_static()) || |
| 0 | 417 // static methods don't need to be in vtable |
|
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418 (target_method()->name() == vmSymbols::object_initializer_name()) |
| 0 | 419 // <init> is never called dynamically-bound |
| 420 ) { | |
| 421 return false; | |
| 422 } | |
| 423 | |
| 424 // we need a new entry if there is no superclass | |
| 425 if (super == NULL) { | |
| 426 return true; | |
| 427 } | |
| 428 | |
| 429 // private methods always have a new entry in the vtable | |
|
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430 // specification interpretation since classic has |
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431 // private methods not overriding |
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432 if (target_method()->is_private()) { |
| 0 | 433 return true; |
| 434 } | |
| 435 | |
| 436 // search through the super class hierarchy to see if we need | |
| 437 // a new entry | |
|
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438 ResourceMark rm; |
|
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439 Symbol* name = target_method()->name(); |
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440 Symbol* signature = target_method()->signature(); |
| 0 | 441 klassOop k = super; |
|
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442 methodOop super_method = NULL; |
| 0 | 443 instanceKlass *holder = NULL; |
|
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444 methodOop recheck_method = NULL; |
| 0 | 445 while (k != NULL) { |
| 446 // lookup through the hierarchy for a method with matching name and sign. | |
|
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447 super_method = instanceKlass::cast(k)->lookup_method(name, signature); |
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448 if (super_method == NULL) { |
| 0 | 449 break; // we still have to search for a matching miranda method |
| 450 } | |
| 451 // get the class holding the matching method | |
|
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452 // make sure you use that class for is_override |
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453 instanceKlass* superk = instanceKlass::cast(super_method->method_holder()); |
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454 // we want only instance method matches |
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455 // pretend private methods are not in the super vtable |
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456 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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457 // ignore private, c.m pub does override a.m pub |
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458 // For classes that were not javac'd together, we also do transitive overriding around |
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459 // methods that have less accessibility |
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460 if ((!super_method->is_static()) && |
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461 (!super_method->is_private())) { |
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462 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
| 0 | 463 return false; |
|
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464 // else keep looking for transitive overrides |
| 0 | 465 } |
| 466 } | |
| 467 | |
|
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468 // Start with lookup result and continue to search up |
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469 k = superk->super(); // haven't found an override match yet; continue to look |
| 0 | 470 } |
| 471 | |
| 472 // if the target method is public or protected it may have a matching | |
| 473 // miranda method in the super, whose entry it should re-use. | |
|
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474 // Actually, to handle cases that javac would not generate, we need |
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475 // this check for all access permissions. |
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476 instanceKlass *sk = instanceKlass::cast(super); |
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477 if (sk->has_miranda_methods()) { |
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478 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
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479 return false; // found a matching miranda; we do not need a new entry |
| 0 | 480 } |
| 481 } | |
| 482 return true; // found no match; we need a new entry | |
| 483 } | |
| 484 | |
| 485 // Support for miranda methods | |
| 486 | |
| 487 // get the vtable index of a miranda method with matching "name" and "signature" | |
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488 int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) { |
| 0 | 489 // search from the bottom, might be faster |
| 490 for (int i = (length() - 1); i >= 0; i--) { | |
| 491 methodOop m = table()[i].method(); | |
| 492 if (is_miranda_entry_at(i) && | |
| 493 m->name() == name && m->signature() == signature) { | |
| 494 return i; | |
| 495 } | |
| 496 } | |
| 497 return methodOopDesc::invalid_vtable_index; | |
| 498 } | |
| 499 | |
| 500 // check if an entry is miranda | |
| 501 bool klassVtable::is_miranda_entry_at(int i) { | |
| 502 methodOop m = method_at(i); | |
| 503 klassOop method_holder = m->method_holder(); | |
| 504 instanceKlass *mhk = instanceKlass::cast(method_holder); | |
| 505 | |
| 506 // miranda methods are interface methods in a class's vtable | |
| 507 if (mhk->is_interface()) { | |
| 508 assert(m->is_public() && m->is_abstract(), "should be public and abstract"); | |
| 509 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); | |
| 510 assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); | |
| 511 return true; | |
| 512 } | |
| 513 return false; | |
| 514 } | |
| 515 | |
| 516 // check if a method is a miranda method, given a class's methods table and it's super | |
| 517 // the caller must make sure that the method belongs to an interface implemented by the class | |
| 518 bool klassVtable::is_miranda(methodOop m, objArrayOop class_methods, klassOop super) { | |
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519 Symbol* name = m->name(); |
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520 Symbol* signature = m->signature(); |
| 0 | 521 if (instanceKlass::find_method(class_methods, name, signature) == NULL) { |
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522 // did not find it in the method table of the current class |
| 0 | 523 if (super == NULL) { |
| 524 // super doesn't exist | |
| 525 return true; | |
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526 } |
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527 |
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528 methodOop mo = instanceKlass::cast(super)->lookup_method(name, signature); |
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529 if (mo == NULL || mo->access_flags().is_private() ) { |
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530 // super class hierarchy does not implement it or protection is different |
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531 return true; |
| 0 | 532 } |
| 533 } | |
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534 |
| 0 | 535 return false; |
| 536 } | |
| 537 | |
| 538 void klassVtable::add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, | |
| 539 objArrayOop current_interface_methods, | |
| 540 objArrayOop class_methods, | |
| 541 klassOop super) { | |
| 542 // iterate thru the current interface's method to see if it a miranda | |
| 543 int num_methods = current_interface_methods->length(); | |
| 544 for (int i = 0; i < num_methods; i++) { | |
| 545 methodOop im = methodOop(current_interface_methods->obj_at(i)); | |
| 546 bool is_duplicate = false; | |
| 547 int num_of_current_mirandas = list_of_current_mirandas->length(); | |
| 548 // check for duplicate mirandas in different interfaces we implement | |
| 549 for (int j = 0; j < num_of_current_mirandas; j++) { | |
| 550 methodOop miranda = list_of_current_mirandas->at(j); | |
| 551 if ((im->name() == miranda->name()) && | |
| 552 (im->signature() == miranda->signature())) { | |
| 553 is_duplicate = true; | |
| 554 break; | |
| 555 } | |
| 556 } | |
| 557 | |
| 558 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
| 559 if (is_miranda(im, class_methods, super)) { // is it a miranda at all? | |
| 560 instanceKlass *sk = instanceKlass::cast(super); | |
| 561 // check if it is a duplicate of a super's miranda | |
| 562 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { | |
| 563 list_of_current_mirandas->append(im); | |
| 564 } | |
| 565 } | |
| 566 } | |
| 567 } | |
| 568 } | |
| 569 | |
| 570 void klassVtable::get_mirandas(GrowableArray<methodOop>* mirandas, | |
| 571 klassOop super, objArrayOop class_methods, | |
| 572 objArrayOop local_interfaces) { | |
| 573 assert((mirandas->length() == 0) , "current mirandas must be 0"); | |
| 574 | |
| 575 // iterate thru the local interfaces looking for a miranda | |
| 576 int num_local_ifs = local_interfaces->length(); | |
| 577 for (int i = 0; i < num_local_ifs; i++) { | |
| 578 instanceKlass *ik = instanceKlass::cast(klassOop(local_interfaces->obj_at(i))); | |
| 579 add_new_mirandas_to_list(mirandas, ik->methods(), class_methods, super); | |
| 580 // iterate thru each local's super interfaces | |
| 581 objArrayOop super_ifs = ik->transitive_interfaces(); | |
| 582 int num_super_ifs = super_ifs->length(); | |
| 583 for (int j = 0; j < num_super_ifs; j++) { | |
| 584 instanceKlass *sik = instanceKlass::cast(klassOop(super_ifs->obj_at(j))); | |
| 585 add_new_mirandas_to_list(mirandas, sik->methods(), class_methods, super); | |
| 586 } | |
| 587 } | |
| 588 } | |
| 589 | |
| 590 // get number of mirandas | |
| 591 int klassVtable::get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces) { | |
| 592 ResourceMark rm; | |
| 593 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
| 594 get_mirandas(mirandas, super, class_methods, local_interfaces); | |
| 595 return mirandas->length(); | |
| 596 } | |
| 597 | |
| 598 // fill in mirandas | |
| 599 void klassVtable::fill_in_mirandas(int& initialized) { | |
| 600 ResourceMark rm; | |
| 601 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
| 602 instanceKlass *this_ik = ik(); | |
| 603 get_mirandas(mirandas, this_ik->super(), this_ik->methods(), this_ik->local_interfaces()); | |
| 604 int num_mirandas = mirandas->length(); | |
| 605 for (int i = 0; i < num_mirandas; i++) { | |
| 606 put_method_at(mirandas->at(i), initialized); | |
| 607 initialized++; | |
| 608 } | |
| 609 } | |
| 610 | |
| 611 void klassVtable::copy_vtable_to(vtableEntry* start) { | |
| 612 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
| 613 } | |
| 614 | |
| 615 void klassVtable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 616 int methods_length, bool * trace_name_printed) { | |
| 617 // search the vtable for uses of either obsolete or EMCP methods | |
| 618 for (int j = 0; j < methods_length; j++) { | |
| 619 methodOop old_method = old_methods[j]; | |
| 620 methodOop new_method = new_methods[j]; | |
| 621 | |
| 622 // In the vast majority of cases we could get the vtable index | |
| 623 // by using: old_method->vtable_index() | |
| 624 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
| 625 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
| 626 // vtable, so, alas, we must do an exhaustive search. | |
| 627 for (int index = 0; index < length(); index++) { | |
| 628 if (unchecked_method_at(index) == old_method) { | |
| 629 put_method_at(new_method, index); | |
| 630 | |
| 631 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 632 if (!(*trace_name_printed)) { | |
| 633 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 634 RC_TRACE_MESG(("adjust: name=%s", | |
| 635 Klass::cast(old_method->method_holder())->external_name())); | |
| 636 *trace_name_printed = true; | |
| 637 } | |
| 638 // RC_TRACE macro has an embedded ResourceMark | |
| 639 RC_TRACE(0x00100000, ("vtable method update: %s(%s)", | |
| 640 new_method->name()->as_C_string(), | |
| 641 new_method->signature()->as_C_string())); | |
| 642 } | |
| 643 } | |
| 644 } | |
| 645 } | |
| 646 } | |
| 647 | |
| 648 | |
| 649 // Garbage collection | |
| 650 void klassVtable::oop_follow_contents() { | |
| 651 int len = length(); | |
| 652 for (int i = 0; i < len; i++) { | |
| 653 MarkSweep::mark_and_push(adr_method_at(i)); | |
| 654 } | |
| 655 } | |
| 656 | |
| 657 #ifndef SERIALGC | |
| 658 void klassVtable::oop_follow_contents(ParCompactionManager* cm) { | |
| 659 int len = length(); | |
| 660 for (int i = 0; i < len; i++) { | |
| 661 PSParallelCompact::mark_and_push(cm, adr_method_at(i)); | |
| 662 } | |
| 663 } | |
| 664 #endif // SERIALGC | |
| 665 | |
| 666 void klassVtable::oop_adjust_pointers() { | |
| 667 int len = length(); | |
| 668 for (int i = 0; i < len; i++) { | |
| 669 MarkSweep::adjust_pointer(adr_method_at(i)); | |
| 670 } | |
| 671 } | |
| 672 | |
| 673 #ifndef SERIALGC | |
| 674 void klassVtable::oop_update_pointers(ParCompactionManager* cm) { | |
| 675 const int n = length(); | |
| 676 for (int i = 0; i < n; i++) { | |
| 677 PSParallelCompact::adjust_pointer(adr_method_at(i)); | |
| 678 } | |
| 679 } | |
| 680 #endif // SERIALGC | |
| 681 | |
| 682 // Iterators | |
| 683 void klassVtable::oop_oop_iterate(OopClosure* blk) { | |
| 684 int len = length(); | |
| 685 for (int i = 0; i < len; i++) { | |
| 686 blk->do_oop(adr_method_at(i)); | |
| 687 } | |
| 688 } | |
| 689 | |
| 690 void klassVtable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 691 int len = length(); | |
| 692 int i; | |
| 693 for (i = 0; i < len; i++) { | |
| 694 if ((HeapWord*)adr_method_at(i) >= mr.start()) break; | |
| 695 } | |
| 696 for (; i < len; i++) { | |
| 697 oop* adr = adr_method_at(i); | |
| 698 if ((HeapWord*)adr < mr.end()) blk->do_oop(adr); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 //----------------------------------------------------------------------------------------- | |
| 703 // Itable code | |
| 704 | |
| 705 // Initialize a itableMethodEntry | |
| 706 void itableMethodEntry::initialize(methodOop m) { | |
| 707 if (m == NULL) return; | |
| 708 | |
| 709 _method = m; | |
| 710 } | |
| 711 | |
| 712 klassItable::klassItable(instanceKlassHandle klass) { | |
| 713 _klass = klass; | |
| 714 | |
| 715 if (klass->itable_length() > 0) { | |
| 716 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
| 717 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
| 718 // First offset entry points to the first method_entry | |
| 719 intptr_t* method_entry = (intptr_t *)(((address)klass->as_klassOop()) + offset_entry->offset()); | |
| 720 intptr_t* end = klass->end_of_itable(); | |
| 721 | |
| 722 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass->as_klassOop(); | |
| 723 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); | |
| 724 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
| 725 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
| 726 return; | |
| 727 } | |
| 728 } | |
| 729 | |
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730 // The length of the itable was either zero, or it has not yet been initialized. |
| 0 | 731 _table_offset = 0; |
| 732 _size_offset_table = 0; | |
| 733 _size_method_table = 0; | |
| 734 } | |
| 735 | |
| 736 // Garbage Collection | |
| 737 | |
| 738 void klassItable::oop_follow_contents() { | |
| 739 // offset table | |
| 740 itableOffsetEntry* ioe = offset_entry(0); | |
| 741 for(int i = 0; i < _size_offset_table; i++) { | |
| 742 MarkSweep::mark_and_push((oop*)&ioe->_interface); | |
| 743 ioe++; | |
| 744 } | |
| 745 | |
| 746 // method table | |
| 747 itableMethodEntry* ime = method_entry(0); | |
| 748 for(int j = 0; j < _size_method_table; j++) { | |
| 749 MarkSweep::mark_and_push((oop*)&ime->_method); | |
| 750 ime++; | |
| 751 } | |
| 752 } | |
| 753 | |
| 754 #ifndef SERIALGC | |
| 755 void klassItable::oop_follow_contents(ParCompactionManager* cm) { | |
| 756 // offset table | |
| 757 itableOffsetEntry* ioe = offset_entry(0); | |
| 758 for(int i = 0; i < _size_offset_table; i++) { | |
| 759 PSParallelCompact::mark_and_push(cm, (oop*)&ioe->_interface); | |
| 760 ioe++; | |
| 761 } | |
| 762 | |
| 763 // method table | |
| 764 itableMethodEntry* ime = method_entry(0); | |
| 765 for(int j = 0; j < _size_method_table; j++) { | |
| 766 PSParallelCompact::mark_and_push(cm, (oop*)&ime->_method); | |
| 767 ime++; | |
| 768 } | |
| 769 } | |
| 770 #endif // SERIALGC | |
| 771 | |
| 772 void klassItable::oop_adjust_pointers() { | |
| 773 // offset table | |
| 774 itableOffsetEntry* ioe = offset_entry(0); | |
| 775 for(int i = 0; i < _size_offset_table; i++) { | |
| 776 MarkSweep::adjust_pointer((oop*)&ioe->_interface); | |
| 777 ioe++; | |
| 778 } | |
| 779 | |
| 780 // method table | |
| 781 itableMethodEntry* ime = method_entry(0); | |
| 782 for(int j = 0; j < _size_method_table; j++) { | |
| 783 MarkSweep::adjust_pointer((oop*)&ime->_method); | |
| 784 ime++; | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 #ifndef SERIALGC | |
| 789 void klassItable::oop_update_pointers(ParCompactionManager* cm) { | |
| 790 // offset table | |
| 791 itableOffsetEntry* ioe = offset_entry(0); | |
| 792 for(int i = 0; i < _size_offset_table; i++) { | |
| 793 PSParallelCompact::adjust_pointer((oop*)&ioe->_interface); | |
| 794 ioe++; | |
| 795 } | |
| 796 | |
| 797 // method table | |
| 798 itableMethodEntry* ime = method_entry(0); | |
| 799 for(int j = 0; j < _size_method_table; j++) { | |
| 800 PSParallelCompact::adjust_pointer((oop*)&ime->_method); | |
| 801 ime++; | |
| 802 } | |
| 803 } | |
| 804 #endif // SERIALGC | |
| 805 | |
| 806 // Iterators | |
| 807 void klassItable::oop_oop_iterate(OopClosure* blk) { | |
| 808 // offset table | |
| 809 itableOffsetEntry* ioe = offset_entry(0); | |
| 810 for(int i = 0; i < _size_offset_table; i++) { | |
| 811 blk->do_oop((oop*)&ioe->_interface); | |
| 812 ioe++; | |
| 813 } | |
| 814 | |
| 815 // method table | |
| 816 itableMethodEntry* ime = method_entry(0); | |
| 817 for(int j = 0; j < _size_method_table; j++) { | |
| 818 blk->do_oop((oop*)&ime->_method); | |
| 819 ime++; | |
| 820 } | |
| 821 } | |
| 822 | |
| 823 void klassItable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 824 // offset table | |
| 825 itableOffsetEntry* ioe = offset_entry(0); | |
| 826 for(int i = 0; i < _size_offset_table; i++) { | |
| 827 oop* adr = (oop*)&ioe->_interface; | |
| 828 if (mr.contains(adr)) blk->do_oop(adr); | |
| 829 ioe++; | |
| 830 } | |
| 831 | |
| 832 // method table | |
| 833 itableMethodEntry* ime = method_entry(0); | |
| 834 for(int j = 0; j < _size_method_table; j++) { | |
| 835 oop* adr = (oop*)&ime->_method; | |
| 836 if (mr.contains(adr)) blk->do_oop(adr); | |
| 837 ime++; | |
| 838 } | |
| 839 } | |
| 840 | |
| 841 | |
| 842 static int initialize_count = 0; | |
| 843 | |
| 844 // Initialization | |
| 845 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
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846 // Cannot be setup doing bootstrapping, interfaces don't have |
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847 // itables, and klass with only ones entry have empty itables |
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848 if (Universe::is_bootstrapping() || |
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849 _klass->is_interface() || |
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850 _klass->itable_length() == itableOffsetEntry::size()) return; |
| 0 | 851 |
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852 // There's alway an extra itable entry so we can null-terminate it. |
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853 guarantee(size_offset_table() >= 1, "too small"); |
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854 int num_interfaces = size_offset_table() - 1; |
| 0 | 855 if (num_interfaces > 0) { |
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856 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
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857 _klass->name()->as_C_string()); |
| 0 | 858 |
| 859 | |
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860 // Iterate through all interfaces |
| 0 | 861 int i; |
| 862 for(i = 0; i < num_interfaces; i++) { | |
| 863 itableOffsetEntry* ioe = offset_entry(i); | |
| 864 KlassHandle interf_h (THREAD, ioe->interface_klass()); | |
| 865 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
| 866 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
| 867 } | |
| 868 | |
| 869 } | |
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870 // Check that the last entry is empty |
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871 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
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872 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
| 0 | 873 } |
| 874 | |
| 875 | |
| 876 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { | |
| 877 objArrayHandle methods(THREAD, instanceKlass::cast(interf_h())->methods()); | |
| 878 int nof_methods = methods()->length(); | |
| 879 HandleMark hm; | |
| 880 KlassHandle klass = _klass; | |
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881 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
| 0 | 882 Handle interface_loader (THREAD, instanceKlass::cast(interf_h())->class_loader()); |
| 883 int ime_num = 0; | |
| 884 | |
| 885 // Skip first methodOop if it is a class initializer | |
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886 int i = ((methodOop)methods()->obj_at(0))->is_static_initializer() ? 1 : 0; |
| 0 | 887 |
| 888 // m, method_name, method_signature, klass reset each loop so they | |
| 889 // don't need preserving across check_signature_loaders call | |
| 890 // methods needs a handle in case of gc from check_signature_loaders | |
| 891 for(; i < nof_methods; i++) { | |
| 892 methodOop m = (methodOop)methods()->obj_at(i); | |
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893 Symbol* method_name = m->name(); |
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894 Symbol* method_signature = m->signature(); |
| 0 | 895 |
| 896 // This is same code as in Linkresolver::lookup_instance_method_in_klasses | |
| 897 methodOop target = klass->uncached_lookup_method(method_name, method_signature); | |
| 898 while (target != NULL && target->is_static()) { | |
| 899 // continue with recursive lookup through the superclass | |
| 900 klassOop super = Klass::cast(target->method_holder())->super(); | |
| 901 target = (super == NULL) ? methodOop(NULL) : Klass::cast(super)->uncached_lookup_method(method_name, method_signature); | |
| 902 } | |
| 903 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
| 904 // Entry do not resolve. Leave it empty | |
| 905 } else { | |
| 906 // Entry did resolve, check loader constraints before initializing | |
| 907 // if checkconstraints requested | |
| 908 methodHandle target_h (THREAD, target); // preserve across gc | |
| 909 if (checkconstraints) { | |
| 910 Handle method_holder_loader (THREAD, instanceKlass::cast(target->method_holder())->class_loader()); | |
| 911 if (method_holder_loader() != interface_loader()) { | |
| 912 ResourceMark rm(THREAD); | |
| 913 char* failed_type_name = | |
| 914 SystemDictionary::check_signature_loaders(method_signature, | |
| 915 method_holder_loader, | |
| 916 interface_loader, | |
| 917 true, CHECK); | |
| 918 if (failed_type_name != NULL) { | |
| 919 const char* msg = "loader constraint violation in interface " | |
| 920 "itable initialization: when resolving method \"%s\" the class" | |
| 921 " loader (instance of %s) of the current class, %s, " | |
| 922 "and the class loader (instance of %s) for interface " | |
| 923 "%s have different Class objects for the type %s " | |
| 924 "used in the signature"; | |
| 925 char* sig = target_h()->name_and_sig_as_C_string(); | |
| 926 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); | |
| 927 char* current = klass->name()->as_C_string(); | |
| 928 const char* loader2 = SystemDictionary::loader_name(interface_loader()); | |
| 929 char* iface = instanceKlass::cast(interf_h())->name()->as_C_string(); | |
| 930 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
| 931 strlen(current) + strlen(loader2) + strlen(iface) + | |
| 932 strlen(failed_type_name); | |
| 933 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 934 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 935 iface, failed_type_name); | |
| 936 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 937 } | |
| 938 } | |
| 939 } | |
| 940 | |
| 941 // ime may have moved during GC so recalculate address | |
| 942 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); | |
| 943 } | |
| 944 // Progress to next entry | |
| 945 ime_num++; | |
| 946 } | |
| 947 } | |
| 948 | |
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949 // Update entry for specific methodOop |
| 0 | 950 void klassItable::initialize_with_method(methodOop m) { |
| 951 itableMethodEntry* ime = method_entry(0); | |
| 952 for(int i = 0; i < _size_method_table; i++) { | |
| 953 if (ime->method() == m) { | |
| 954 ime->initialize(m); | |
| 955 } | |
| 956 ime++; | |
| 957 } | |
| 958 } | |
| 959 | |
| 960 void klassItable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 961 int methods_length, bool * trace_name_printed) { | |
| 962 // search the itable for uses of either obsolete or EMCP methods | |
| 963 for (int j = 0; j < methods_length; j++) { | |
| 964 methodOop old_method = old_methods[j]; | |
| 965 methodOop new_method = new_methods[j]; | |
| 966 itableMethodEntry* ime = method_entry(0); | |
| 967 | |
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968 // The itable can describe more than one interface and the same |
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969 // method signature can be specified by more than one interface. |
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970 // This means we have to do an exhaustive search to find all the |
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971 // old_method references. |
| 0 | 972 for (int i = 0; i < _size_method_table; i++) { |
| 973 if (ime->method() == old_method) { | |
| 974 ime->initialize(new_method); | |
| 975 | |
| 976 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 977 if (!(*trace_name_printed)) { | |
| 978 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 979 RC_TRACE_MESG(("adjust: name=%s", | |
| 980 Klass::cast(old_method->method_holder())->external_name())); | |
| 981 *trace_name_printed = true; | |
| 982 } | |
| 983 // RC_TRACE macro has an embedded ResourceMark | |
| 984 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
| 985 new_method->name()->as_C_string(), | |
| 986 new_method->signature()->as_C_string())); | |
| 987 } | |
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988 break; |
| 0 | 989 } |
| 990 ime++; | |
| 991 } | |
| 992 } | |
| 993 } | |
| 994 | |
| 995 | |
| 996 // Setup | |
| 997 class InterfaceVisiterClosure : public StackObj { | |
| 998 public: | |
| 999 virtual void doit(klassOop intf, int method_count) = 0; | |
| 1000 }; | |
| 1001 | |
| 1002 // Visit all interfaces with at-least one method (excluding <clinit>) | |
| 1003 void visit_all_interfaces(objArrayOop transitive_intf, InterfaceVisiterClosure *blk) { | |
| 1004 // Handle array argument | |
| 1005 for(int i = 0; i < transitive_intf->length(); i++) { | |
| 1006 klassOop intf = (klassOop)transitive_intf->obj_at(i); | |
| 1007 assert(Klass::cast(intf)->is_interface(), "sanity check"); | |
| 1008 | |
| 1009 // Find no. of methods excluding a <clinit> | |
| 1010 int method_count = instanceKlass::cast(intf)->methods()->length(); | |
| 1011 if (method_count > 0) { | |
| 1012 methodOop m = (methodOop)instanceKlass::cast(intf)->methods()->obj_at(0); | |
| 1013 assert(m != NULL && m->is_method(), "sanity check"); | |
| 1014 if (m->name() == vmSymbols::object_initializer_name()) { | |
| 1015 method_count--; | |
| 1016 } | |
| 1017 } | |
| 1018 | |
| 1019 // Only count interfaces with at least one method | |
| 1020 if (method_count > 0) { | |
| 1021 blk->doit(intf, method_count); | |
| 1022 } | |
| 1023 } | |
| 1024 } | |
| 1025 | |
| 1026 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
| 1027 private: | |
| 1028 int _nof_methods; | |
| 1029 int _nof_interfaces; | |
| 1030 public: | |
| 1031 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
| 1032 | |
| 1033 int nof_methods() const { return _nof_methods; } | |
| 1034 int nof_interfaces() const { return _nof_interfaces; } | |
| 1035 | |
| 1036 void doit(klassOop intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } | |
| 1037 }; | |
| 1038 | |
| 1039 class SetupItableClosure : public InterfaceVisiterClosure { | |
| 1040 private: | |
| 1041 itableOffsetEntry* _offset_entry; | |
| 1042 itableMethodEntry* _method_entry; | |
| 1043 address _klass_begin; | |
| 1044 public: | |
| 1045 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
| 1046 _klass_begin = klass_begin; | |
| 1047 _offset_entry = offset_entry; | |
| 1048 _method_entry = method_entry; | |
| 1049 } | |
| 1050 | |
| 1051 itableMethodEntry* method_entry() const { return _method_entry; } | |
| 1052 | |
| 1053 void doit(klassOop intf, int method_count) { | |
| 1054 int offset = ((address)_method_entry) - _klass_begin; | |
| 1055 _offset_entry->initialize(intf, offset); | |
| 1056 _offset_entry++; | |
| 1057 _method_entry += method_count; | |
| 1058 } | |
| 1059 }; | |
| 1060 | |
| 1061 int klassItable::compute_itable_size(objArrayHandle transitive_interfaces) { | |
| 1062 // Count no of interfaces and total number of interface methods | |
| 1063 CountInterfacesClosure cic; | |
| 1064 visit_all_interfaces(transitive_interfaces(), &cic); | |
| 1065 | |
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1066 // There's alway an extra itable entry so we can null-terminate it. |
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1067 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
| 0 | 1068 |
| 1069 // Statistics | |
| 1070 update_stats(itable_size * HeapWordSize); | |
| 1071 | |
| 1072 return itable_size; | |
| 1073 } | |
| 1074 | |
| 1075 | |
| 1076 // Fill out offset table and interface klasses into the itable space | |
| 1077 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
| 1078 if (klass->itable_length() == 0) return; | |
| 1079 assert(!klass->is_interface(), "Should have zero length itable"); | |
| 1080 | |
| 1081 // Count no of interfaces and total number of interface methods | |
| 1082 CountInterfacesClosure cic; | |
| 1083 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
| 1084 int nof_methods = cic.nof_methods(); | |
| 1085 int nof_interfaces = cic.nof_interfaces(); | |
| 1086 | |
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1087 // Add one extra entry so we can null-terminate the table |
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1088 nof_interfaces++; |
| 0 | 1089 |
| 1090 assert(compute_itable_size(objArrayHandle(klass->transitive_interfaces())) == | |
| 1091 calc_itable_size(nof_interfaces, nof_methods), | |
| 1092 "mismatch calculation of itable size"); | |
| 1093 | |
| 1094 // Fill-out offset table | |
| 1095 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
| 1096 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
| 1097 intptr_t* end = klass->end_of_itable(); | |
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1098 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)"); |
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1099 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
| 0 | 1100 |
| 1101 // Visit all interfaces and initialize itable offset table | |
| 1102 SetupItableClosure sic((address)klass->as_klassOop(), ioe, ime); | |
| 1103 visit_all_interfaces(klass->transitive_interfaces(), &sic); | |
| 1104 | |
| 1105 #ifdef ASSERT | |
| 1106 ime = sic.method_entry(); | |
| 1107 oop* v = (oop*) klass->end_of_itable(); | |
| 1108 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
| 1109 #endif | |
| 1110 } | |
| 1111 | |
| 1112 | |
| 1113 // m must be a method in an interface | |
| 1114 int klassItable::compute_itable_index(methodOop m) { | |
| 1115 klassOop intf = m->method_holder(); | |
| 1116 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); | |
| 1117 objArrayOop methods = instanceKlass::cast(intf)->methods(); | |
| 1118 int index = 0; | |
| 1119 while(methods->obj_at(index) != m) { | |
| 1120 index++; | |
| 1121 assert(index < methods->length(), "should find index for resolve_invoke"); | |
| 1122 } | |
| 1123 // Adjust for <clinit>, which is left out of table if first method | |
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1124 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->is_static_initializer()) { |
| 0 | 1125 index--; |
| 1126 } | |
| 1127 return index; | |
| 1128 } | |
| 1129 | |
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1130 |
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1131 // inverse to compute_itable_index |
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1132 methodOop klassItable::method_for_itable_index(klassOop intf, int itable_index) { |
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1133 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); |
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1134 objArrayOop methods = instanceKlass::cast(intf)->methods(); |
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1135 |
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1136 int index = itable_index; |
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1137 // Adjust for <clinit>, which is left out of table if first method |
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1138 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->is_static_initializer()) { |
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1139 index++; |
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1140 } |
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1141 |
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1142 if (itable_index < 0 || index >= methods->length()) |
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1143 return NULL; // help caller defend against bad indexes |
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1144 |
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1145 methodOop m = (methodOop)methods->obj_at(index); |
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1146 assert(compute_itable_index(m) == itable_index, "correct inverse"); |
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1147 |
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1148 return m; |
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1149 } |
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1150 |
| 0 | 1151 void klassVtable::verify(outputStream* st, bool forced) { |
| 1152 // make sure table is initialized | |
| 1153 if (!Universe::is_fully_initialized()) return; | |
| 1154 #ifndef PRODUCT | |
| 1155 // avoid redundant verifies | |
| 1156 if (!forced && _verify_count == Universe::verify_count()) return; | |
| 1157 _verify_count = Universe::verify_count(); | |
| 1158 #endif | |
| 1159 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 1160 oop* end_of_vtable = (oop *)&table()[_length]; | |
| 1161 if (end_of_vtable > end_of_obj) { | |
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1162 fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
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1163 "end)", _klass->internal_name())); |
| 0 | 1164 } |
| 1165 | |
| 1166 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
| 1167 // verify consistency with superKlass vtable | |
| 1168 klassOop super = _klass->super(); | |
| 1169 if (super != NULL) { | |
| 1170 instanceKlass* sk = instanceKlass::cast(super); | |
| 1171 klassVtable* vt = sk->vtable(); | |
| 1172 for (int i = 0; i < vt->length(); i++) { | |
| 1173 verify_against(st, vt, i); | |
| 1174 } | |
| 1175 } | |
| 1176 } | |
| 1177 | |
| 1178 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
| 1179 vtableEntry* vte = &vt->table()[index]; | |
| 1180 if (vte->method()->name() != table()[index].method()->name() || | |
| 1181 vte->method()->signature() != table()[index].method()->signature()) { | |
| 1182 fatal("mismatched name/signature of vtable entries"); | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 #ifndef PRODUCT | |
| 1187 void klassVtable::print() { | |
| 1188 ResourceMark rm; | |
| 1189 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
| 1190 for (int i = 0; i < length(); i++) { | |
| 1191 table()[i].print(); | |
| 1192 tty->cr(); | |
| 1193 } | |
| 1194 } | |
| 1195 #endif | |
| 1196 | |
| 1197 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
| 1198 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
| 1199 assert(method() != NULL, "must have set method"); | |
| 1200 method()->verify(); | |
| 1201 // we sub_type, because it could be a miranda method | |
| 1202 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
| 1203 #ifndef PRODUCT | |
| 1204 print(); | |
| 1205 #endif | |
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1206 fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
| 0 | 1207 } |
| 1208 } | |
| 1209 | |
| 1210 #ifndef PRODUCT | |
| 1211 | |
| 1212 void vtableEntry::print() { | |
| 1213 ResourceMark rm; | |
| 1214 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
| 1215 if (Verbose) { | |
| 1216 tty->print("m %#lx ", (address)method()); | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 class VtableStats : AllStatic { | |
| 1221 public: | |
| 1222 static int no_klasses; // # classes with vtables | |
| 1223 static int no_array_klasses; // # array classes | |
| 1224 static int no_instance_klasses; // # instanceKlasses | |
| 1225 static int sum_of_vtable_len; // total # of vtable entries | |
| 1226 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
| 1227 static int fixed; // total fixed overhead in bytes | |
| 1228 static int filler; // overhead caused by filler bytes | |
| 1229 static int entries; // total bytes consumed by vtable entries | |
| 1230 static int array_entries; // total bytes consumed by array vtable entries | |
| 1231 | |
| 1232 static void do_class(klassOop k) { | |
| 1233 Klass* kl = k->klass_part(); | |
| 1234 klassVtable* vt = kl->vtable(); | |
| 1235 if (vt == NULL) return; | |
| 1236 no_klasses++; | |
| 1237 if (kl->oop_is_instance()) { | |
| 1238 no_instance_klasses++; | |
| 1239 kl->array_klasses_do(do_class); | |
| 1240 } | |
| 1241 if (kl->oop_is_array()) { | |
| 1242 no_array_klasses++; | |
| 1243 sum_of_array_vtable_len += vt->length(); | |
| 1244 } | |
| 1245 sum_of_vtable_len += vt->length(); | |
| 1246 } | |
| 1247 | |
| 1248 static void compute() { | |
| 1249 SystemDictionary::classes_do(do_class); | |
| 1250 fixed = no_klasses * oopSize; // vtable length | |
| 1251 // filler size is a conservative approximation | |
| 1252 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(instanceKlass) - sizeof(arrayKlass) - 1); | |
| 1253 entries = sizeof(vtableEntry) * sum_of_vtable_len; | |
| 1254 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
| 1255 } | |
| 1256 }; | |
| 1257 | |
| 1258 int VtableStats::no_klasses = 0; | |
| 1259 int VtableStats::no_array_klasses = 0; | |
| 1260 int VtableStats::no_instance_klasses = 0; | |
| 1261 int VtableStats::sum_of_vtable_len = 0; | |
| 1262 int VtableStats::sum_of_array_vtable_len = 0; | |
| 1263 int VtableStats::fixed = 0; | |
| 1264 int VtableStats::filler = 0; | |
| 1265 int VtableStats::entries = 0; | |
| 1266 int VtableStats::array_entries = 0; | |
| 1267 | |
| 1268 void klassVtable::print_statistics() { | |
| 1269 ResourceMark rm; | |
| 1270 HandleMark hm; | |
| 1271 VtableStats::compute(); | |
| 1272 tty->print_cr("vtable statistics:"); | |
| 1273 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
| 1274 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
| 1275 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
| 1276 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
| 1277 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
| 1278 tty->print_cr("%6d bytes total", total); | |
| 1279 } | |
| 1280 | |
| 1281 bool klassVtable::check_no_old_entries() { | |
| 1282 // Check that there really is no entry | |
| 1283 for (int i = 0; i < length(); i++) { | |
| 1284 methodOop m = unchecked_method_at(i); | |
| 1285 if (m != NULL) { | |
| 1286 if (m->is_old()) { | |
| 1287 return false; | |
| 1288 } | |
| 1289 } | |
| 1290 } | |
| 1291 return true; | |
| 1292 } | |
| 1293 | |
| 1294 void klassVtable::dump_vtable() { | |
| 1295 tty->print_cr("vtable dump --"); | |
| 1296 for (int i = 0; i < length(); i++) { | |
| 1297 methodOop m = unchecked_method_at(i); | |
| 1298 if (m != NULL) { | |
| 1299 tty->print(" (%5d) ", i); | |
| 1300 m->access_flags().print_on(tty); | |
| 1301 tty->print(" -- "); | |
| 1302 m->print_name(tty); | |
| 1303 tty->cr(); | |
| 1304 } | |
| 1305 } | |
| 1306 } | |
| 1307 | |
| 1308 int klassItable::_total_classes; // Total no. of classes with itables | |
| 1309 long klassItable::_total_size; // Total no. of bytes used for itables | |
| 1310 | |
| 1311 void klassItable::print_statistics() { | |
| 1312 tty->print_cr("itable statistics:"); | |
| 1313 tty->print_cr("%6d classes with itables", _total_classes); | |
| 1314 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
| 1315 } | |
| 1316 | |
| 1317 #endif // PRODUCT |