Mercurial > hg > truffle
annotate src/share/vm/oops/klassVtable.cpp @ 676:d3676b4cb78c
Merge
| author | kvn |
|---|---|
| date | Tue, 31 Mar 2009 10:02:01 -0700 |
| parents | 4aaa9f5e02a8 c89f86385056 |
| children | cff162798819 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_klassVtable.cpp.incl" | |
| 27 | |
| 28 inline instanceKlass* klassVtable::ik() const { | |
| 29 Klass* k = _klass()->klass_part(); | |
| 30 assert(k->oop_is_instance(), "not an instanceKlass"); | |
| 31 return (instanceKlass*)k; | |
| 32 } | |
| 33 | |
| 34 | |
| 35 // this function computes the vtable size (including the size needed for miranda | |
| 36 // methods) and the number of miranda methods in this class | |
| 37 // Note on Miranda methods: Let's say there is a class C that implements | |
| 38 // interface I. Let's say there is a method m in I that neither C nor any | |
| 39 // of its super classes implement (i.e there is no method of any access, with | |
| 40 // the same name and signature as m), then m is a Miranda method which is | |
| 41 // entered as a public abstract method in C's vtable. From then on it should | |
| 42 // treated as any other public method in C for method over-ride purposes. | |
| 43 void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length, | |
| 44 int &num_miranda_methods, | |
| 45 klassOop super, | |
| 46 objArrayOop methods, | |
| 47 AccessFlags class_flags, | |
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48 Handle classloader, |
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49 symbolHandle classname, |
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50 objArrayOop local_interfaces, |
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51 TRAPS |
| 0 | 52 ) { |
| 53 | |
| 54 No_Safepoint_Verifier nsv; | |
| 55 | |
| 56 // set up default result values | |
| 57 vtable_length = 0; | |
| 58 num_miranda_methods = 0; | |
| 59 | |
| 60 // start off with super's vtable length | |
| 61 instanceKlass* sk = (instanceKlass*)super->klass_part(); | |
| 62 vtable_length = super == NULL ? 0 : sk->vtable_length(); | |
| 63 | |
| 64 // go thru each method in the methods table to see if it needs a new entry | |
| 65 int len = methods->length(); | |
| 66 for (int i = 0; i < len; i++) { | |
| 67 assert(methods->obj_at(i)->is_method(), "must be a methodOop"); | |
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68 methodHandle mh(THREAD, methodOop(methods->obj_at(i))); |
| 0 | 69 |
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70 if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
| 0 | 71 vtable_length += vtableEntry::size(); // we need a new entry |
| 72 } | |
| 73 } | |
| 74 | |
| 75 // compute the number of mirandas methods that must be added to the end | |
| 76 num_miranda_methods = get_num_mirandas(super, methods, local_interfaces); | |
| 77 vtable_length += (num_miranda_methods * vtableEntry::size()); | |
| 78 | |
| 79 if (Universe::is_bootstrapping() && vtable_length == 0) { | |
| 80 // array classes don't have their superclass set correctly during | |
| 81 // bootstrapping | |
| 82 vtable_length = Universe::base_vtable_size(); | |
| 83 } | |
| 84 | |
| 85 if (super == NULL && !Universe::is_bootstrapping() && | |
| 86 vtable_length != Universe::base_vtable_size()) { | |
| 87 // Someone is attempting to redefine java.lang.Object incorrectly. The | |
| 88 // only way this should happen is from | |
| 89 // SystemDictionary::resolve_from_stream(), which will detect this later | |
| 90 // and throw a security exception. So don't assert here to let | |
| 91 // the exception occur. | |
| 92 vtable_length = Universe::base_vtable_size(); | |
| 93 } | |
| 94 assert(super != NULL || vtable_length == Universe::base_vtable_size(), | |
| 95 "bad vtable size for class Object"); | |
| 96 assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); | |
| 97 assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); | |
| 98 } | |
| 99 | |
| 100 int klassVtable::index_of(methodOop m, int len) const { | |
| 101 assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); | |
| 102 return m->vtable_index(); | |
| 103 } | |
| 104 | |
| 105 int klassVtable::initialize_from_super(KlassHandle super) { | |
| 106 if (super.is_null()) { | |
| 107 return 0; | |
| 108 } else { | |
| 109 // copy methods from superKlass | |
| 110 // can't inherit from array class, so must be instanceKlass | |
| 111 assert(super->oop_is_instance(), "must be instance klass"); | |
| 112 instanceKlass* sk = (instanceKlass*)super()->klass_part(); | |
| 113 klassVtable* superVtable = sk->vtable(); | |
| 114 assert(superVtable->length() <= _length, "vtable too short"); | |
| 115 #ifdef ASSERT | |
| 116 superVtable->verify(tty, true); | |
| 117 #endif | |
| 118 superVtable->copy_vtable_to(table()); | |
| 119 #ifndef PRODUCT | |
| 120 if (PrintVtables && Verbose) { | |
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121 ResourceMark rm; |
| 0 | 122 tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
| 123 } | |
| 124 #endif | |
| 125 return superVtable->length(); | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 // Revised lookup semantics introduced 1.3 (Kestral beta) | |
| 130 void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { | |
| 131 | |
| 132 // Note: Arrays can have intermediate array supers. Use java_super to skip them. | |
| 133 KlassHandle super (THREAD, klass()->java_super()); | |
| 134 int nofNewEntries = 0; | |
| 135 | |
| 136 | |
| 137 if (PrintVtables && !klass()->oop_is_array()) { | |
| 138 ResourceMark rm(THREAD); | |
| 139 tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); | |
| 140 } | |
| 141 | |
| 142 #ifdef ASSERT | |
| 143 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 144 oop* end_of_vtable = (oop*)&table()[_length]; | |
| 145 assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); | |
| 146 #endif | |
| 147 | |
| 148 if (Universe::is_bootstrapping()) { | |
| 149 // just clear everything | |
| 150 for (int i = 0; i < _length; i++) table()[i].clear(); | |
| 151 return; | |
| 152 } | |
| 153 | |
| 154 int super_vtable_len = initialize_from_super(super); | |
| 155 if (klass()->oop_is_array()) { | |
| 156 assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); | |
| 157 } else { | |
| 158 assert(_klass->oop_is_instance(), "must be instanceKlass"); | |
| 159 | |
| 160 objArrayHandle methods(THREAD, ik()->methods()); | |
| 161 int len = methods()->length(); | |
| 162 int initialized = super_vtable_len; | |
| 163 | |
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164 // update_inherited_vtable can stop for gc - ensure using handles |
| 0 | 165 for (int i = 0; i < len; i++) { |
| 166 HandleMark hm(THREAD); | |
| 167 assert(methods()->obj_at(i)->is_method(), "must be a methodOop"); | |
| 168 methodHandle mh(THREAD, (methodOop)methods()->obj_at(i)); | |
| 169 | |
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170 bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
| 0 | 171 |
| 172 if (needs_new_entry) { | |
| 173 put_method_at(mh(), initialized); | |
| 174 mh()->set_vtable_index(initialized); // set primary vtable index | |
| 175 initialized++; | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 // add miranda methods; it will also update the value of initialized | |
| 180 fill_in_mirandas(initialized); | |
| 181 | |
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182 // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
| 0 | 183 // package_private -> publicprotected), the vtable might actually be smaller than our initial |
| 184 // calculation. | |
| 185 assert(initialized <= _length, "vtable initialization failed"); | |
| 186 for(;initialized < _length; initialized++) { | |
| 187 put_method_at(NULL, initialized); | |
| 188 } | |
| 189 NOT_PRODUCT(verify(tty, true)); | |
| 190 } | |
| 191 } | |
| 192 | |
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193 // Called for cases where a method does not override its superclass' vtable entry |
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194 // For bytecodes not produced by javac together it is possible that a method does not override |
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195 // the superclass's method, but might indirectly override a super-super class's vtable entry |
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196 // If none found, return a null superk, else return the superk of the method this does override |
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197 instanceKlass* klassVtable::find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, |
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198 int vtable_index, Handle target_loader, symbolHandle target_classname, Thread * THREAD) { |
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199 instanceKlass* superk = initialsuper; |
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200 while (superk != NULL && superk->super() != NULL) { |
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201 instanceKlass* supersuperklass = instanceKlass::cast(superk->super()); |
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202 klassVtable* ssVtable = supersuperklass->vtable(); |
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203 if (vtable_index < ssVtable->length()) { |
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204 methodOop super_method = ssVtable->method_at(vtable_index); |
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205 #ifndef PRODUCT |
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206 symbolHandle name(THREAD,target_method()->name()); |
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207 symbolHandle signature(THREAD,target_method()->signature()); |
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208 assert(super_method->name() == name() && super_method->signature() == signature(), "vtable entry name/sig mismatch"); |
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209 #endif |
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210 if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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211 #ifndef PRODUCT |
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212 if (PrintVtables && Verbose) { |
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213 ResourceMark rm(THREAD); |
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214 tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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215 supersuperklass->internal_name(), |
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216 _klass->internal_name(), (target_method() != NULL) ? |
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217 target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
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218 super_method->access_flags().print_on(tty); |
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219 tty->print("overriders flags: "); |
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220 target_method->access_flags().print_on(tty); |
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221 tty->cr(); |
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222 } |
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223 #endif /*PRODUCT*/ |
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224 break; // return found superk |
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225 } |
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226 } else { |
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227 // super class has no vtable entry here, stop transitive search |
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228 superk = (instanceKlass*)NULL; |
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229 break; |
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230 } |
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231 // if no override found yet, continue to search up |
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232 superk = instanceKlass::cast(superk->super()); |
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233 } |
| 0 | 234 |
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235 return superk; |
| 0 | 236 } |
| 237 | |
| 238 | |
| 239 // Update child's copy of super vtable for overrides | |
| 240 // OR return true if a new vtable entry is required | |
| 241 // Only called for instanceKlass's, i.e. not for arrays | |
| 242 // If that changed, could not use _klass as handle for klass | |
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243 bool klassVtable::update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, |
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244 bool checkconstraints, TRAPS) { |
| 0 | 245 ResourceMark rm; |
| 246 bool allocate_new = true; | |
| 247 assert(klass->oop_is_instance(), "must be instanceKlass"); | |
| 248 | |
| 249 // Initialize the method's vtable index to "nonvirtual". | |
| 250 // If we allocate a vtable entry, we will update it to a non-negative number. | |
| 251 target_method()->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); | |
| 252 | |
| 253 // Static and <init> methods are never in | |
| 254 if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { | |
| 255 return false; | |
| 256 } | |
| 257 | |
| 258 if (klass->is_final() || target_method()->is_final()) { | |
| 259 // a final method never needs a new entry; final methods can be statically | |
| 260 // resolved and they have to be present in the vtable only if they override | |
| 261 // a super's method, in which case they re-use its entry | |
| 262 allocate_new = false; | |
| 263 } | |
| 264 | |
| 265 // we need a new entry if there is no superclass | |
| 266 if (klass->super() == NULL) { | |
| 267 return allocate_new; | |
| 268 } | |
| 269 | |
| 270 // private methods always have a new entry in the vtable | |
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271 // specification interpretation since classic has |
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272 // private methods not overriding |
| 0 | 273 if (target_method()->is_private()) { |
| 274 return allocate_new; | |
| 275 } | |
| 276 | |
| 277 // search through the vtable and update overridden entries | |
| 278 // Since check_signature_loaders acquires SystemDictionary_lock | |
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279 // which can block for gc, once we are in this loop, use handles |
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280 // For classfiles built with >= jdk7, we now look for transitive overrides |
| 0 | 281 |
| 282 symbolHandle name(THREAD,target_method()->name()); | |
| 283 symbolHandle signature(THREAD,target_method()->signature()); | |
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284 Handle target_loader(THREAD, _klass->class_loader()); |
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285 symbolHandle target_classname(THREAD, _klass->name()); |
| 0 | 286 for(int i = 0; i < super_vtable_len; i++) { |
|
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287 methodOop super_method = method_at(i); |
| 0 | 288 // Check if method name matches |
|
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289 if (super_method->name() == name() && super_method->signature() == signature()) { |
| 0 | 290 |
|
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291 // get super_klass for method_holder for the found method |
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292 instanceKlass* super_klass = instanceKlass::cast(super_method->method_holder()); |
| 0 | 293 |
|
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294 if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
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295 ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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296 && ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
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297 target_classname, THREAD)) != (instanceKlass*)NULL))) { |
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298 // overriding, so no new entry |
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299 allocate_new = false; |
| 0 | 300 |
| 301 if (checkconstraints) { | |
| 302 // Override vtable entry if passes loader constraint check | |
| 303 // if loader constraint checking requested | |
| 304 // No need to visit his super, since he and his super | |
| 305 // have already made any needed loader constraints. | |
| 306 // Since loader constraints are transitive, it is enough | |
| 307 // to link to the first super, and we get all the others. | |
| 308 Handle super_loader(THREAD, super_klass->class_loader()); | |
| 309 | |
|
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310 if (target_loader() != super_loader()) { |
| 0 | 311 ResourceMark rm(THREAD); |
| 312 char* failed_type_name = | |
|
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313 SystemDictionary::check_signature_loaders(signature, target_loader, |
| 0 | 314 super_loader, true, |
| 315 CHECK_(false)); | |
| 316 if (failed_type_name != NULL) { | |
| 317 const char* msg = "loader constraint violation: when resolving " | |
| 318 "overridden method \"%s\" the class loader (instance" | |
| 319 " of %s) of the current class, %s, and its superclass loader " | |
| 320 "(instance of %s), have different Class objects for the type " | |
| 321 "%s used in the signature"; | |
| 322 char* sig = target_method()->name_and_sig_as_C_string(); | |
|
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323 const char* loader1 = SystemDictionary::loader_name(target_loader()); |
| 0 | 324 char* current = _klass->name()->as_C_string(); |
| 325 const char* loader2 = SystemDictionary::loader_name(super_loader()); | |
| 326 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
| 327 strlen(current) + strlen(loader2) + strlen(failed_type_name); | |
| 328 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 329 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 330 failed_type_name); | |
| 331 THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); | |
| 332 } | |
| 333 } | |
|
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334 } |
| 0 | 335 |
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336 put_method_at(target_method(), i); |
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337 target_method()->set_vtable_index(i); |
| 0 | 338 #ifndef PRODUCT |
|
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339 if (PrintVtables && Verbose) { |
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340 tty->print("overriding with %s::%s index %d, original flags: ", |
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341 _klass->internal_name(), (target_method() != NULL) ? |
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342 target_method()->name()->as_C_string() : "<NULL>", i); |
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343 super_method->access_flags().print_on(tty); |
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344 tty->print("overriders flags: "); |
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345 target_method->access_flags().print_on(tty); |
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346 tty->cr(); |
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347 } |
| 0 | 348 #endif /*PRODUCT*/ |
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349 } else { |
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350 // allocate_new = true; default. We might override one entry, |
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351 // but not override another. Once we override one, not need new |
| 0 | 352 #ifndef PRODUCT |
|
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353 if (PrintVtables && Verbose) { |
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354 tty->print("NOT 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*/ |
| 363 } | |
| 364 } | |
| 365 } | |
| 366 return allocate_new; | |
| 367 } | |
| 368 | |
| 369 void klassVtable::put_method_at(methodOop m, int index) { | |
| 370 assert(m->is_oop_or_null(), "Not an oop or null"); | |
| 371 #ifndef PRODUCT | |
| 372 if (PrintVtables && Verbose) { | |
|
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373 ResourceMark rm; |
| 0 | 374 tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
| 375 (m != NULL) ? m->name()->as_C_string() : "<NULL>", index); | |
| 376 } | |
| 377 assert(unchecked_method_at(index)->is_oop_or_null(), "Not an oop or null"); | |
| 378 #endif | |
| 379 table()[index].set(m); | |
| 380 } | |
| 381 | |
| 382 // Find out if a method "m" with superclass "super", loader "classloader" and | |
| 383 // name "classname" needs a new vtable entry. Let P be a class package defined | |
| 384 // by "classloader" and "classname". | |
| 385 // NOTE: The logic used here is very similar to the one used for computing | |
| 386 // the vtables indices for a method. We cannot directly use that function because, | |
|
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387 // we allocate the instanceKlass at load time, and that requires that the |
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388 // superclass has been loaded. |
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389 // However, the vtable entries are filled in at link time, and therefore |
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390 // the superclass' vtable may not yet have been filled in. |
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391 bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
| 0 | 392 klassOop super, |
|
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393 Handle classloader, |
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394 symbolHandle classname, |
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395 AccessFlags class_flags, |
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396 TRAPS) { |
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397 if ((class_flags.is_final() || target_method()->is_final()) || |
| 0 | 398 // a final method never needs a new entry; final methods can be statically |
| 399 // resolved and they have to be present in the vtable only if they override | |
| 400 // a super's method, in which case they re-use its entry | |
|
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401 (target_method()->is_static()) || |
| 0 | 402 // static methods don't need to be in vtable |
|
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403 (target_method()->name() == vmSymbols::object_initializer_name()) |
| 0 | 404 // <init> is never called dynamically-bound |
| 405 ) { | |
| 406 return false; | |
| 407 } | |
| 408 | |
| 409 // we need a new entry if there is no superclass | |
| 410 if (super == NULL) { | |
| 411 return true; | |
| 412 } | |
| 413 | |
| 414 // private methods always have a new entry in the vtable | |
|
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415 // specification interpretation since classic has |
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416 // private methods not overriding |
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417 if (target_method()->is_private()) { |
| 0 | 418 return true; |
| 419 } | |
| 420 | |
| 421 // search through the super class hierarchy to see if we need | |
| 422 // a new entry | |
|
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423 ResourceMark rm; |
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424 symbolOop name = target_method()->name(); |
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425 symbolOop signature = target_method()->signature(); |
| 0 | 426 klassOop k = super; |
|
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427 methodOop super_method = NULL; |
| 0 | 428 instanceKlass *holder = NULL; |
|
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429 methodOop recheck_method = NULL; |
| 0 | 430 while (k != NULL) { |
| 431 // lookup through the hierarchy for a method with matching name and sign. | |
|
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432 super_method = instanceKlass::cast(k)->lookup_method(name, signature); |
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433 if (super_method == NULL) { |
| 0 | 434 break; // we still have to search for a matching miranda method |
| 435 } | |
| 436 // get the class holding the matching method | |
|
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437 // make sure you use that class for is_override |
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438 instanceKlass* superk = instanceKlass::cast(super_method->method_holder()); |
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439 // we want only instance method matches |
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440 // pretend private methods are not in the super vtable |
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441 // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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442 // ignore private, c.m pub does override a.m pub |
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443 // For classes that were not javac'd together, we also do transitive overriding around |
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444 // methods that have less accessibility |
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445 if ((!super_method->is_static()) && |
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446 (!super_method->is_private())) { |
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447 if (superk->is_override(super_method, classloader, classname, THREAD)) { |
| 0 | 448 return false; |
|
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449 // else keep looking for transitive overrides |
| 0 | 450 } |
| 451 } | |
| 452 | |
|
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453 // Start with lookup result and continue to search up |
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454 k = superk->super(); // haven't found an override match yet; continue to look |
| 0 | 455 } |
| 456 | |
| 457 // if the target method is public or protected it may have a matching | |
| 458 // miranda method in the super, whose entry it should re-use. | |
|
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459 // Actually, to handle cases that javac would not generate, we need |
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460 // this check for all access permissions. |
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461 instanceKlass *sk = instanceKlass::cast(super); |
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462 if (sk->has_miranda_methods()) { |
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463 if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
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464 return false; // found a matching miranda; we do not need a new entry |
| 0 | 465 } |
| 466 } | |
| 467 return true; // found no match; we need a new entry | |
| 468 } | |
| 469 | |
| 470 // Support for miranda methods | |
| 471 | |
| 472 // get the vtable index of a miranda method with matching "name" and "signature" | |
| 473 int klassVtable::index_of_miranda(symbolOop name, symbolOop signature) { | |
| 474 // search from the bottom, might be faster | |
| 475 for (int i = (length() - 1); i >= 0; i--) { | |
| 476 methodOop m = table()[i].method(); | |
| 477 if (is_miranda_entry_at(i) && | |
| 478 m->name() == name && m->signature() == signature) { | |
| 479 return i; | |
| 480 } | |
| 481 } | |
| 482 return methodOopDesc::invalid_vtable_index; | |
| 483 } | |
| 484 | |
| 485 // check if an entry is miranda | |
| 486 bool klassVtable::is_miranda_entry_at(int i) { | |
| 487 methodOop m = method_at(i); | |
| 488 klassOop method_holder = m->method_holder(); | |
| 489 instanceKlass *mhk = instanceKlass::cast(method_holder); | |
| 490 | |
| 491 // miranda methods are interface methods in a class's vtable | |
| 492 if (mhk->is_interface()) { | |
| 493 assert(m->is_public() && m->is_abstract(), "should be public and abstract"); | |
| 494 assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); | |
| 495 assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); | |
| 496 return true; | |
| 497 } | |
| 498 return false; | |
| 499 } | |
| 500 | |
| 501 // check if a method is a miranda method, given a class's methods table and it's super | |
| 502 // the caller must make sure that the method belongs to an interface implemented by the class | |
| 503 bool klassVtable::is_miranda(methodOop m, objArrayOop class_methods, klassOop super) { | |
| 504 symbolOop name = m->name(); | |
| 505 symbolOop signature = m->signature(); | |
| 506 if (instanceKlass::find_method(class_methods, name, signature) == NULL) { | |
| 507 // did not find it in the method table of the current class | |
| 508 if (super == NULL) { | |
| 509 // super doesn't exist | |
| 510 return true; | |
| 511 } else { | |
| 512 if (instanceKlass::cast(super)->lookup_method(name, signature) == NULL) { | |
| 513 // super class hierarchy does not implement it | |
| 514 return true; | |
| 515 } | |
| 516 } | |
| 517 } | |
| 518 return false; | |
| 519 } | |
| 520 | |
| 521 void klassVtable::add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, | |
| 522 objArrayOop current_interface_methods, | |
| 523 objArrayOop class_methods, | |
| 524 klassOop super) { | |
| 525 // iterate thru the current interface's method to see if it a miranda | |
| 526 int num_methods = current_interface_methods->length(); | |
| 527 for (int i = 0; i < num_methods; i++) { | |
| 528 methodOop im = methodOop(current_interface_methods->obj_at(i)); | |
| 529 bool is_duplicate = false; | |
| 530 int num_of_current_mirandas = list_of_current_mirandas->length(); | |
| 531 // check for duplicate mirandas in different interfaces we implement | |
| 532 for (int j = 0; j < num_of_current_mirandas; j++) { | |
| 533 methodOop miranda = list_of_current_mirandas->at(j); | |
| 534 if ((im->name() == miranda->name()) && | |
| 535 (im->signature() == miranda->signature())) { | |
| 536 is_duplicate = true; | |
| 537 break; | |
| 538 } | |
| 539 } | |
| 540 | |
| 541 if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable | |
| 542 if (is_miranda(im, class_methods, super)) { // is it a miranda at all? | |
| 543 instanceKlass *sk = instanceKlass::cast(super); | |
| 544 // check if it is a duplicate of a super's miranda | |
| 545 if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { | |
| 546 list_of_current_mirandas->append(im); | |
| 547 } | |
| 548 } | |
| 549 } | |
| 550 } | |
| 551 } | |
| 552 | |
| 553 void klassVtable::get_mirandas(GrowableArray<methodOop>* mirandas, | |
| 554 klassOop super, objArrayOop class_methods, | |
| 555 objArrayOop local_interfaces) { | |
| 556 assert((mirandas->length() == 0) , "current mirandas must be 0"); | |
| 557 | |
| 558 // iterate thru the local interfaces looking for a miranda | |
| 559 int num_local_ifs = local_interfaces->length(); | |
| 560 for (int i = 0; i < num_local_ifs; i++) { | |
| 561 instanceKlass *ik = instanceKlass::cast(klassOop(local_interfaces->obj_at(i))); | |
| 562 add_new_mirandas_to_list(mirandas, ik->methods(), class_methods, super); | |
| 563 // iterate thru each local's super interfaces | |
| 564 objArrayOop super_ifs = ik->transitive_interfaces(); | |
| 565 int num_super_ifs = super_ifs->length(); | |
| 566 for (int j = 0; j < num_super_ifs; j++) { | |
| 567 instanceKlass *sik = instanceKlass::cast(klassOop(super_ifs->obj_at(j))); | |
| 568 add_new_mirandas_to_list(mirandas, sik->methods(), class_methods, super); | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 // get number of mirandas | |
| 574 int klassVtable::get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces) { | |
| 575 ResourceMark rm; | |
| 576 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
| 577 get_mirandas(mirandas, super, class_methods, local_interfaces); | |
| 578 return mirandas->length(); | |
| 579 } | |
| 580 | |
| 581 // fill in mirandas | |
| 582 void klassVtable::fill_in_mirandas(int& initialized) { | |
| 583 ResourceMark rm; | |
| 584 GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); | |
| 585 instanceKlass *this_ik = ik(); | |
| 586 get_mirandas(mirandas, this_ik->super(), this_ik->methods(), this_ik->local_interfaces()); | |
| 587 int num_mirandas = mirandas->length(); | |
| 588 for (int i = 0; i < num_mirandas; i++) { | |
| 589 put_method_at(mirandas->at(i), initialized); | |
| 590 initialized++; | |
| 591 } | |
| 592 } | |
| 593 | |
| 594 void klassVtable::copy_vtable_to(vtableEntry* start) { | |
| 595 Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); | |
| 596 } | |
| 597 | |
| 598 void klassVtable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 599 int methods_length, bool * trace_name_printed) { | |
| 600 // search the vtable for uses of either obsolete or EMCP methods | |
| 601 for (int j = 0; j < methods_length; j++) { | |
| 602 methodOop old_method = old_methods[j]; | |
| 603 methodOop new_method = new_methods[j]; | |
| 604 | |
| 605 // In the vast majority of cases we could get the vtable index | |
| 606 // by using: old_method->vtable_index() | |
| 607 // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() | |
| 608 // in sun.awt.X11.XFramePeer where methods occur more than once in the | |
| 609 // vtable, so, alas, we must do an exhaustive search. | |
| 610 for (int index = 0; index < length(); index++) { | |
| 611 if (unchecked_method_at(index) == old_method) { | |
| 612 put_method_at(new_method, index); | |
| 613 | |
| 614 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 615 if (!(*trace_name_printed)) { | |
| 616 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 617 RC_TRACE_MESG(("adjust: name=%s", | |
| 618 Klass::cast(old_method->method_holder())->external_name())); | |
| 619 *trace_name_printed = true; | |
| 620 } | |
| 621 // RC_TRACE macro has an embedded ResourceMark | |
| 622 RC_TRACE(0x00100000, ("vtable method update: %s(%s)", | |
| 623 new_method->name()->as_C_string(), | |
| 624 new_method->signature()->as_C_string())); | |
| 625 } | |
| 626 } | |
| 627 } | |
| 628 } | |
| 629 } | |
| 630 | |
| 631 | |
| 632 // Garbage collection | |
| 633 void klassVtable::oop_follow_contents() { | |
| 634 int len = length(); | |
| 635 for (int i = 0; i < len; i++) { | |
| 636 MarkSweep::mark_and_push(adr_method_at(i)); | |
| 637 } | |
| 638 } | |
| 639 | |
| 640 #ifndef SERIALGC | |
| 641 void klassVtable::oop_follow_contents(ParCompactionManager* cm) { | |
| 642 int len = length(); | |
| 643 for (int i = 0; i < len; i++) { | |
| 644 PSParallelCompact::mark_and_push(cm, adr_method_at(i)); | |
| 645 } | |
| 646 } | |
| 647 #endif // SERIALGC | |
| 648 | |
| 649 void klassVtable::oop_adjust_pointers() { | |
| 650 int len = length(); | |
| 651 for (int i = 0; i < len; i++) { | |
| 652 MarkSweep::adjust_pointer(adr_method_at(i)); | |
| 653 } | |
| 654 } | |
| 655 | |
| 656 #ifndef SERIALGC | |
| 657 void klassVtable::oop_update_pointers(ParCompactionManager* cm) { | |
| 658 const int n = length(); | |
| 659 for (int i = 0; i < n; i++) { | |
| 660 PSParallelCompact::adjust_pointer(adr_method_at(i)); | |
| 661 } | |
| 662 } | |
| 663 | |
| 664 void klassVtable::oop_update_pointers(ParCompactionManager* cm, | |
| 665 HeapWord* beg_addr, HeapWord* end_addr) { | |
| 666 const int n = length(); | |
| 667 const int entry_size = vtableEntry::size(); | |
| 668 | |
| 669 int beg_idx = 0; | |
| 670 HeapWord* const method_0 = (HeapWord*)adr_method_at(0); | |
| 671 if (beg_addr > method_0) { | |
| 672 // it's safe to use cast, as we have guarantees on vtable size to be sane | |
| 673 beg_idx = int((pointer_delta(beg_addr, method_0) + entry_size - 1) / entry_size); | |
| 674 } | |
| 675 | |
| 676 oop* const beg_oop = adr_method_at(beg_idx); | |
| 677 oop* const end_oop = MIN2((oop*)end_addr, adr_method_at(n)); | |
| 678 for (oop* cur_oop = beg_oop; cur_oop < end_oop; cur_oop += entry_size) { | |
| 679 PSParallelCompact::adjust_pointer(cur_oop); | |
| 680 } | |
| 681 } | |
| 682 #endif // SERIALGC | |
| 683 | |
| 684 // Iterators | |
| 685 void klassVtable::oop_oop_iterate(OopClosure* blk) { | |
| 686 int len = length(); | |
| 687 for (int i = 0; i < len; i++) { | |
| 688 blk->do_oop(adr_method_at(i)); | |
| 689 } | |
| 690 } | |
| 691 | |
| 692 void klassVtable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 693 int len = length(); | |
| 694 int i; | |
| 695 for (i = 0; i < len; i++) { | |
| 696 if ((HeapWord*)adr_method_at(i) >= mr.start()) break; | |
| 697 } | |
| 698 for (; i < len; i++) { | |
| 699 oop* adr = adr_method_at(i); | |
| 700 if ((HeapWord*)adr < mr.end()) blk->do_oop(adr); | |
| 701 } | |
| 702 } | |
| 703 | |
| 704 //----------------------------------------------------------------------------------------- | |
| 705 // Itable code | |
| 706 | |
| 707 // Initialize a itableMethodEntry | |
| 708 void itableMethodEntry::initialize(methodOop m) { | |
| 709 if (m == NULL) return; | |
| 710 | |
| 711 _method = m; | |
| 712 } | |
| 713 | |
| 714 klassItable::klassItable(instanceKlassHandle klass) { | |
| 715 _klass = klass; | |
| 716 | |
| 717 if (klass->itable_length() > 0) { | |
| 718 itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); | |
| 719 if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized | |
| 720 // First offset entry points to the first method_entry | |
| 721 intptr_t* method_entry = (intptr_t *)(((address)klass->as_klassOop()) + offset_entry->offset()); | |
| 722 intptr_t* end = klass->end_of_itable(); | |
| 723 | |
| 724 _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass->as_klassOop(); | |
| 725 _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); | |
| 726 _size_method_table = (end - method_entry) / itableMethodEntry::size(); | |
| 727 assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); | |
| 728 return; | |
| 729 } | |
| 730 } | |
| 731 | |
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732 // The length of the itable was either zero, or it has not yet been initialized. |
| 0 | 733 _table_offset = 0; |
| 734 _size_offset_table = 0; | |
| 735 _size_method_table = 0; | |
| 736 } | |
| 737 | |
| 738 // Garbage Collection | |
| 739 | |
| 740 void klassItable::oop_follow_contents() { | |
| 741 // offset table | |
| 742 itableOffsetEntry* ioe = offset_entry(0); | |
| 743 for(int i = 0; i < _size_offset_table; i++) { | |
| 744 MarkSweep::mark_and_push((oop*)&ioe->_interface); | |
| 745 ioe++; | |
| 746 } | |
| 747 | |
| 748 // method table | |
| 749 itableMethodEntry* ime = method_entry(0); | |
| 750 for(int j = 0; j < _size_method_table; j++) { | |
| 751 MarkSweep::mark_and_push((oop*)&ime->_method); | |
| 752 ime++; | |
| 753 } | |
| 754 } | |
| 755 | |
| 756 #ifndef SERIALGC | |
| 757 void klassItable::oop_follow_contents(ParCompactionManager* cm) { | |
| 758 // offset table | |
| 759 itableOffsetEntry* ioe = offset_entry(0); | |
| 760 for(int i = 0; i < _size_offset_table; i++) { | |
| 761 PSParallelCompact::mark_and_push(cm, (oop*)&ioe->_interface); | |
| 762 ioe++; | |
| 763 } | |
| 764 | |
| 765 // method table | |
| 766 itableMethodEntry* ime = method_entry(0); | |
| 767 for(int j = 0; j < _size_method_table; j++) { | |
| 768 PSParallelCompact::mark_and_push(cm, (oop*)&ime->_method); | |
| 769 ime++; | |
| 770 } | |
| 771 } | |
| 772 #endif // SERIALGC | |
| 773 | |
| 774 void klassItable::oop_adjust_pointers() { | |
| 775 // offset table | |
| 776 itableOffsetEntry* ioe = offset_entry(0); | |
| 777 for(int i = 0; i < _size_offset_table; i++) { | |
| 778 MarkSweep::adjust_pointer((oop*)&ioe->_interface); | |
| 779 ioe++; | |
| 780 } | |
| 781 | |
| 782 // method table | |
| 783 itableMethodEntry* ime = method_entry(0); | |
| 784 for(int j = 0; j < _size_method_table; j++) { | |
| 785 MarkSweep::adjust_pointer((oop*)&ime->_method); | |
| 786 ime++; | |
| 787 } | |
| 788 } | |
| 789 | |
| 790 #ifndef SERIALGC | |
| 791 void klassItable::oop_update_pointers(ParCompactionManager* cm) { | |
| 792 // offset table | |
| 793 itableOffsetEntry* ioe = offset_entry(0); | |
| 794 for(int i = 0; i < _size_offset_table; i++) { | |
| 795 PSParallelCompact::adjust_pointer((oop*)&ioe->_interface); | |
| 796 ioe++; | |
| 797 } | |
| 798 | |
| 799 // method table | |
| 800 itableMethodEntry* ime = method_entry(0); | |
| 801 for(int j = 0; j < _size_method_table; j++) { | |
| 802 PSParallelCompact::adjust_pointer((oop*)&ime->_method); | |
| 803 ime++; | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 void klassItable::oop_update_pointers(ParCompactionManager* cm, | |
| 808 HeapWord* beg_addr, HeapWord* end_addr) { | |
| 809 // offset table | |
| 810 itableOffsetEntry* ioe = offset_entry(0); | |
| 811 for(int i = 0; i < _size_offset_table; i++) { | |
| 812 oop* p = (oop*)&ioe->_interface; | |
| 813 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); | |
| 814 ioe++; | |
| 815 } | |
| 816 | |
| 817 // method table | |
| 818 itableMethodEntry* ime = method_entry(0); | |
| 819 for(int j = 0; j < _size_method_table; j++) { | |
| 820 oop* p = (oop*)&ime->_method; | |
| 821 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); | |
| 822 ime++; | |
| 823 } | |
| 824 } | |
| 825 #endif // SERIALGC | |
| 826 | |
| 827 // Iterators | |
| 828 void klassItable::oop_oop_iterate(OopClosure* blk) { | |
| 829 // offset table | |
| 830 itableOffsetEntry* ioe = offset_entry(0); | |
| 831 for(int i = 0; i < _size_offset_table; i++) { | |
| 832 blk->do_oop((oop*)&ioe->_interface); | |
| 833 ioe++; | |
| 834 } | |
| 835 | |
| 836 // method table | |
| 837 itableMethodEntry* ime = method_entry(0); | |
| 838 for(int j = 0; j < _size_method_table; j++) { | |
| 839 blk->do_oop((oop*)&ime->_method); | |
| 840 ime++; | |
| 841 } | |
| 842 } | |
| 843 | |
| 844 void klassItable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { | |
| 845 // offset table | |
| 846 itableOffsetEntry* ioe = offset_entry(0); | |
| 847 for(int i = 0; i < _size_offset_table; i++) { | |
| 848 oop* adr = (oop*)&ioe->_interface; | |
| 849 if (mr.contains(adr)) blk->do_oop(adr); | |
| 850 ioe++; | |
| 851 } | |
| 852 | |
| 853 // method table | |
| 854 itableMethodEntry* ime = method_entry(0); | |
| 855 for(int j = 0; j < _size_method_table; j++) { | |
| 856 oop* adr = (oop*)&ime->_method; | |
| 857 if (mr.contains(adr)) blk->do_oop(adr); | |
| 858 ime++; | |
| 859 } | |
| 860 } | |
| 861 | |
| 862 | |
| 863 static int initialize_count = 0; | |
| 864 | |
| 865 // Initialization | |
| 866 void klassItable::initialize_itable(bool checkconstraints, TRAPS) { | |
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867 // Cannot be setup doing bootstrapping, interfaces don't have |
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868 // itables, and klass with only ones entry have empty itables |
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869 if (Universe::is_bootstrapping() || |
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870 _klass->is_interface() || |
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871 _klass->itable_length() == itableOffsetEntry::size()) return; |
| 0 | 872 |
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873 // There's alway an extra itable entry so we can null-terminate it. |
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874 guarantee(size_offset_table() >= 1, "too small"); |
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875 int num_interfaces = size_offset_table() - 1; |
| 0 | 876 if (num_interfaces > 0) { |
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877 if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
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878 _klass->name()->as_C_string()); |
| 0 | 879 |
| 880 | |
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881 // Iterate through all interfaces |
| 0 | 882 int i; |
| 883 for(i = 0; i < num_interfaces; i++) { | |
| 884 itableOffsetEntry* ioe = offset_entry(i); | |
| 885 KlassHandle interf_h (THREAD, ioe->interface_klass()); | |
| 886 assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); | |
| 887 initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); | |
| 888 } | |
| 889 | |
| 890 } | |
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891 // Check that the last entry is empty |
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892 itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
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893 guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
| 0 | 894 } |
| 895 | |
| 896 | |
| 897 void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { | |
| 898 objArrayHandle methods(THREAD, instanceKlass::cast(interf_h())->methods()); | |
| 899 int nof_methods = methods()->length(); | |
| 900 HandleMark hm; | |
| 901 KlassHandle klass = _klass; | |
| 902 assert(nof_methods > 0, "at least one method must exist for interface to be in vtable") | |
| 903 Handle interface_loader (THREAD, instanceKlass::cast(interf_h())->class_loader()); | |
| 904 int ime_num = 0; | |
| 905 | |
| 906 // Skip first methodOop if it is a class initializer | |
| 907 int i = ((methodOop)methods()->obj_at(0))->name() != vmSymbols::class_initializer_name() ? 0 : 1; | |
| 908 | |
| 909 // m, method_name, method_signature, klass reset each loop so they | |
| 910 // don't need preserving across check_signature_loaders call | |
| 911 // methods needs a handle in case of gc from check_signature_loaders | |
| 912 for(; i < nof_methods; i++) { | |
| 913 methodOop m = (methodOop)methods()->obj_at(i); | |
| 914 symbolOop method_name = m->name(); | |
| 915 symbolOop method_signature = m->signature(); | |
| 916 | |
| 917 // This is same code as in Linkresolver::lookup_instance_method_in_klasses | |
| 918 methodOop target = klass->uncached_lookup_method(method_name, method_signature); | |
| 919 while (target != NULL && target->is_static()) { | |
| 920 // continue with recursive lookup through the superclass | |
| 921 klassOop super = Klass::cast(target->method_holder())->super(); | |
| 922 target = (super == NULL) ? methodOop(NULL) : Klass::cast(super)->uncached_lookup_method(method_name, method_signature); | |
| 923 } | |
| 924 if (target == NULL || !target->is_public() || target->is_abstract()) { | |
| 925 // Entry do not resolve. Leave it empty | |
| 926 } else { | |
| 927 // Entry did resolve, check loader constraints before initializing | |
| 928 // if checkconstraints requested | |
| 929 methodHandle target_h (THREAD, target); // preserve across gc | |
| 930 if (checkconstraints) { | |
| 931 Handle method_holder_loader (THREAD, instanceKlass::cast(target->method_holder())->class_loader()); | |
| 932 if (method_holder_loader() != interface_loader()) { | |
| 933 ResourceMark rm(THREAD); | |
| 934 char* failed_type_name = | |
| 935 SystemDictionary::check_signature_loaders(method_signature, | |
| 936 method_holder_loader, | |
| 937 interface_loader, | |
| 938 true, CHECK); | |
| 939 if (failed_type_name != NULL) { | |
| 940 const char* msg = "loader constraint violation in interface " | |
| 941 "itable initialization: when resolving method \"%s\" the class" | |
| 942 " loader (instance of %s) of the current class, %s, " | |
| 943 "and the class loader (instance of %s) for interface " | |
| 944 "%s have different Class objects for the type %s " | |
| 945 "used in the signature"; | |
| 946 char* sig = target_h()->name_and_sig_as_C_string(); | |
| 947 const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); | |
| 948 char* current = klass->name()->as_C_string(); | |
| 949 const char* loader2 = SystemDictionary::loader_name(interface_loader()); | |
| 950 char* iface = instanceKlass::cast(interf_h())->name()->as_C_string(); | |
| 951 size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + | |
| 952 strlen(current) + strlen(loader2) + strlen(iface) + | |
| 953 strlen(failed_type_name); | |
| 954 char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); | |
| 955 jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, | |
| 956 iface, failed_type_name); | |
| 957 THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); | |
| 958 } | |
| 959 } | |
| 960 } | |
| 961 | |
| 962 // ime may have moved during GC so recalculate address | |
| 963 itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); | |
| 964 } | |
| 965 // Progress to next entry | |
| 966 ime_num++; | |
| 967 } | |
| 968 } | |
| 969 | |
|
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970 // Update entry for specific methodOop |
| 0 | 971 void klassItable::initialize_with_method(methodOop m) { |
| 972 itableMethodEntry* ime = method_entry(0); | |
| 973 for(int i = 0; i < _size_method_table; i++) { | |
| 974 if (ime->method() == m) { | |
| 975 ime->initialize(m); | |
| 976 } | |
| 977 ime++; | |
| 978 } | |
| 979 } | |
| 980 | |
| 981 void klassItable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 982 int methods_length, bool * trace_name_printed) { | |
| 983 // search the itable for uses of either obsolete or EMCP methods | |
| 984 for (int j = 0; j < methods_length; j++) { | |
| 985 methodOop old_method = old_methods[j]; | |
| 986 methodOop new_method = new_methods[j]; | |
| 987 itableMethodEntry* ime = method_entry(0); | |
| 988 | |
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989 // The itable can describe more than one interface and the same |
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990 // method signature can be specified by more than one interface. |
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991 // This means we have to do an exhaustive search to find all the |
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992 // old_method references. |
| 0 | 993 for (int i = 0; i < _size_method_table; i++) { |
| 994 if (ime->method() == old_method) { | |
| 995 ime->initialize(new_method); | |
| 996 | |
| 997 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { | |
| 998 if (!(*trace_name_printed)) { | |
| 999 // RC_TRACE_MESG macro has an embedded ResourceMark | |
| 1000 RC_TRACE_MESG(("adjust: name=%s", | |
| 1001 Klass::cast(old_method->method_holder())->external_name())); | |
| 1002 *trace_name_printed = true; | |
| 1003 } | |
| 1004 // RC_TRACE macro has an embedded ResourceMark | |
| 1005 RC_TRACE(0x00200000, ("itable method update: %s(%s)", | |
| 1006 new_method->name()->as_C_string(), | |
| 1007 new_method->signature()->as_C_string())); | |
| 1008 } | |
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1009 break; |
| 0 | 1010 } |
| 1011 ime++; | |
| 1012 } | |
| 1013 } | |
| 1014 } | |
| 1015 | |
| 1016 | |
| 1017 // Setup | |
| 1018 class InterfaceVisiterClosure : public StackObj { | |
| 1019 public: | |
| 1020 virtual void doit(klassOop intf, int method_count) = 0; | |
| 1021 }; | |
| 1022 | |
| 1023 // Visit all interfaces with at-least one method (excluding <clinit>) | |
| 1024 void visit_all_interfaces(objArrayOop transitive_intf, InterfaceVisiterClosure *blk) { | |
| 1025 // Handle array argument | |
| 1026 for(int i = 0; i < transitive_intf->length(); i++) { | |
| 1027 klassOop intf = (klassOop)transitive_intf->obj_at(i); | |
| 1028 assert(Klass::cast(intf)->is_interface(), "sanity check"); | |
| 1029 | |
| 1030 // Find no. of methods excluding a <clinit> | |
| 1031 int method_count = instanceKlass::cast(intf)->methods()->length(); | |
| 1032 if (method_count > 0) { | |
| 1033 methodOop m = (methodOop)instanceKlass::cast(intf)->methods()->obj_at(0); | |
| 1034 assert(m != NULL && m->is_method(), "sanity check"); | |
| 1035 if (m->name() == vmSymbols::object_initializer_name()) { | |
| 1036 method_count--; | |
| 1037 } | |
| 1038 } | |
| 1039 | |
| 1040 // Only count interfaces with at least one method | |
| 1041 if (method_count > 0) { | |
| 1042 blk->doit(intf, method_count); | |
| 1043 } | |
| 1044 } | |
| 1045 } | |
| 1046 | |
| 1047 class CountInterfacesClosure : public InterfaceVisiterClosure { | |
| 1048 private: | |
| 1049 int _nof_methods; | |
| 1050 int _nof_interfaces; | |
| 1051 public: | |
| 1052 CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } | |
| 1053 | |
| 1054 int nof_methods() const { return _nof_methods; } | |
| 1055 int nof_interfaces() const { return _nof_interfaces; } | |
| 1056 | |
| 1057 void doit(klassOop intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } | |
| 1058 }; | |
| 1059 | |
| 1060 class SetupItableClosure : public InterfaceVisiterClosure { | |
| 1061 private: | |
| 1062 itableOffsetEntry* _offset_entry; | |
| 1063 itableMethodEntry* _method_entry; | |
| 1064 address _klass_begin; | |
| 1065 public: | |
| 1066 SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { | |
| 1067 _klass_begin = klass_begin; | |
| 1068 _offset_entry = offset_entry; | |
| 1069 _method_entry = method_entry; | |
| 1070 } | |
| 1071 | |
| 1072 itableMethodEntry* method_entry() const { return _method_entry; } | |
| 1073 | |
| 1074 void doit(klassOop intf, int method_count) { | |
| 1075 int offset = ((address)_method_entry) - _klass_begin; | |
| 1076 _offset_entry->initialize(intf, offset); | |
| 1077 _offset_entry++; | |
| 1078 _method_entry += method_count; | |
| 1079 } | |
| 1080 }; | |
| 1081 | |
| 1082 int klassItable::compute_itable_size(objArrayHandle transitive_interfaces) { | |
| 1083 // Count no of interfaces and total number of interface methods | |
| 1084 CountInterfacesClosure cic; | |
| 1085 visit_all_interfaces(transitive_interfaces(), &cic); | |
| 1086 | |
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1087 // There's alway an extra itable entry so we can null-terminate it. |
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1088 int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
| 0 | 1089 |
| 1090 // Statistics | |
| 1091 update_stats(itable_size * HeapWordSize); | |
| 1092 | |
| 1093 return itable_size; | |
| 1094 } | |
| 1095 | |
| 1096 | |
| 1097 // Fill out offset table and interface klasses into the itable space | |
| 1098 void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { | |
| 1099 if (klass->itable_length() == 0) return; | |
| 1100 assert(!klass->is_interface(), "Should have zero length itable"); | |
| 1101 | |
| 1102 // Count no of interfaces and total number of interface methods | |
| 1103 CountInterfacesClosure cic; | |
| 1104 visit_all_interfaces(klass->transitive_interfaces(), &cic); | |
| 1105 int nof_methods = cic.nof_methods(); | |
| 1106 int nof_interfaces = cic.nof_interfaces(); | |
| 1107 | |
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1108 // Add one extra entry so we can null-terminate the table |
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1109 nof_interfaces++; |
| 0 | 1110 |
| 1111 assert(compute_itable_size(objArrayHandle(klass->transitive_interfaces())) == | |
| 1112 calc_itable_size(nof_interfaces, nof_methods), | |
| 1113 "mismatch calculation of itable size"); | |
| 1114 | |
| 1115 // Fill-out offset table | |
| 1116 itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); | |
| 1117 itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); | |
| 1118 intptr_t* end = klass->end_of_itable(); | |
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1119 assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_static_fields(), "wrong offset calculation (1)"); |
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1120 assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
| 0 | 1121 |
| 1122 // Visit all interfaces and initialize itable offset table | |
| 1123 SetupItableClosure sic((address)klass->as_klassOop(), ioe, ime); | |
| 1124 visit_all_interfaces(klass->transitive_interfaces(), &sic); | |
| 1125 | |
| 1126 #ifdef ASSERT | |
| 1127 ime = sic.method_entry(); | |
| 1128 oop* v = (oop*) klass->end_of_itable(); | |
| 1129 assert( (oop*)(ime) == v, "wrong offset calculation (2)"); | |
| 1130 #endif | |
| 1131 } | |
| 1132 | |
| 1133 | |
| 1134 // m must be a method in an interface | |
| 1135 int klassItable::compute_itable_index(methodOop m) { | |
| 1136 klassOop intf = m->method_holder(); | |
| 1137 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); | |
| 1138 objArrayOop methods = instanceKlass::cast(intf)->methods(); | |
| 1139 int index = 0; | |
| 1140 while(methods->obj_at(index) != m) { | |
| 1141 index++; | |
| 1142 assert(index < methods->length(), "should find index for resolve_invoke"); | |
| 1143 } | |
| 1144 // Adjust for <clinit>, which is left out of table if first method | |
| 1145 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { | |
| 1146 index--; | |
| 1147 } | |
| 1148 return index; | |
| 1149 } | |
| 1150 | |
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1151 |
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1152 // inverse to compute_itable_index |
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1153 methodOop klassItable::method_for_itable_index(klassOop intf, int itable_index) { |
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1154 assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); |
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1155 objArrayOop methods = instanceKlass::cast(intf)->methods(); |
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1156 |
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1157 int index = itable_index; |
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1158 // Adjust for <clinit>, which is left out of table if first method |
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1159 if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { |
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1160 index++; |
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1161 } |
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1162 |
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1163 if (itable_index < 0 || index >= methods->length()) |
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1164 return NULL; // help caller defend against bad indexes |
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1165 |
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1166 methodOop m = (methodOop)methods->obj_at(index); |
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1167 assert(compute_itable_index(m) == itable_index, "correct inverse"); |
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1168 |
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1169 return m; |
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1170 } |
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1171 |
| 0 | 1172 void klassVtable::verify(outputStream* st, bool forced) { |
| 1173 // make sure table is initialized | |
| 1174 if (!Universe::is_fully_initialized()) return; | |
| 1175 #ifndef PRODUCT | |
| 1176 // avoid redundant verifies | |
| 1177 if (!forced && _verify_count == Universe::verify_count()) return; | |
| 1178 _verify_count = Universe::verify_count(); | |
| 1179 #endif | |
| 1180 oop* end_of_obj = (oop*)_klass() + _klass()->size(); | |
| 1181 oop* end_of_vtable = (oop *)&table()[_length]; | |
| 1182 if (end_of_vtable > end_of_obj) { | |
| 1183 fatal1("klass %s: klass object too short (vtable extends beyond end)", | |
| 1184 _klass->internal_name()); | |
| 1185 } | |
| 1186 | |
| 1187 for (int i = 0; i < _length; i++) table()[i].verify(this, st); | |
| 1188 // verify consistency with superKlass vtable | |
| 1189 klassOop super = _klass->super(); | |
| 1190 if (super != NULL) { | |
| 1191 instanceKlass* sk = instanceKlass::cast(super); | |
| 1192 klassVtable* vt = sk->vtable(); | |
| 1193 for (int i = 0; i < vt->length(); i++) { | |
| 1194 verify_against(st, vt, i); | |
| 1195 } | |
| 1196 } | |
| 1197 } | |
| 1198 | |
| 1199 void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { | |
| 1200 vtableEntry* vte = &vt->table()[index]; | |
| 1201 if (vte->method()->name() != table()[index].method()->name() || | |
| 1202 vte->method()->signature() != table()[index].method()->signature()) { | |
| 1203 fatal("mismatched name/signature of vtable entries"); | |
| 1204 } | |
| 1205 } | |
| 1206 | |
| 1207 #ifndef PRODUCT | |
| 1208 void klassVtable::print() { | |
| 1209 ResourceMark rm; | |
| 1210 tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); | |
| 1211 for (int i = 0; i < length(); i++) { | |
| 1212 table()[i].print(); | |
| 1213 tty->cr(); | |
| 1214 } | |
| 1215 } | |
| 1216 #endif | |
| 1217 | |
| 1218 void vtableEntry::verify(klassVtable* vt, outputStream* st) { | |
| 1219 NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); | |
| 1220 assert(method() != NULL, "must have set method"); | |
| 1221 method()->verify(); | |
| 1222 // we sub_type, because it could be a miranda method | |
| 1223 if (!vt->klass()->is_subtype_of(method()->method_holder())) { | |
| 1224 #ifndef PRODUCT | |
| 1225 print(); | |
| 1226 #endif | |
| 1227 fatal1("vtableEntry %#lx: method is from subclass", this); | |
| 1228 } | |
| 1229 } | |
| 1230 | |
| 1231 #ifndef PRODUCT | |
| 1232 | |
| 1233 void vtableEntry::print() { | |
| 1234 ResourceMark rm; | |
| 1235 tty->print("vtableEntry %s: ", method()->name()->as_C_string()); | |
| 1236 if (Verbose) { | |
| 1237 tty->print("m %#lx ", (address)method()); | |
| 1238 } | |
| 1239 } | |
| 1240 | |
| 1241 class VtableStats : AllStatic { | |
| 1242 public: | |
| 1243 static int no_klasses; // # classes with vtables | |
| 1244 static int no_array_klasses; // # array classes | |
| 1245 static int no_instance_klasses; // # instanceKlasses | |
| 1246 static int sum_of_vtable_len; // total # of vtable entries | |
| 1247 static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only | |
| 1248 static int fixed; // total fixed overhead in bytes | |
| 1249 static int filler; // overhead caused by filler bytes | |
| 1250 static int entries; // total bytes consumed by vtable entries | |
| 1251 static int array_entries; // total bytes consumed by array vtable entries | |
| 1252 | |
| 1253 static void do_class(klassOop k) { | |
| 1254 Klass* kl = k->klass_part(); | |
| 1255 klassVtable* vt = kl->vtable(); | |
| 1256 if (vt == NULL) return; | |
| 1257 no_klasses++; | |
| 1258 if (kl->oop_is_instance()) { | |
| 1259 no_instance_klasses++; | |
| 1260 kl->array_klasses_do(do_class); | |
| 1261 } | |
| 1262 if (kl->oop_is_array()) { | |
| 1263 no_array_klasses++; | |
| 1264 sum_of_array_vtable_len += vt->length(); | |
| 1265 } | |
| 1266 sum_of_vtable_len += vt->length(); | |
| 1267 } | |
| 1268 | |
| 1269 static void compute() { | |
| 1270 SystemDictionary::classes_do(do_class); | |
| 1271 fixed = no_klasses * oopSize; // vtable length | |
| 1272 // filler size is a conservative approximation | |
| 1273 filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(instanceKlass) - sizeof(arrayKlass) - 1); | |
| 1274 entries = sizeof(vtableEntry) * sum_of_vtable_len; | |
| 1275 array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; | |
| 1276 } | |
| 1277 }; | |
| 1278 | |
| 1279 int VtableStats::no_klasses = 0; | |
| 1280 int VtableStats::no_array_klasses = 0; | |
| 1281 int VtableStats::no_instance_klasses = 0; | |
| 1282 int VtableStats::sum_of_vtable_len = 0; | |
| 1283 int VtableStats::sum_of_array_vtable_len = 0; | |
| 1284 int VtableStats::fixed = 0; | |
| 1285 int VtableStats::filler = 0; | |
| 1286 int VtableStats::entries = 0; | |
| 1287 int VtableStats::array_entries = 0; | |
| 1288 | |
| 1289 void klassVtable::print_statistics() { | |
| 1290 ResourceMark rm; | |
| 1291 HandleMark hm; | |
| 1292 VtableStats::compute(); | |
| 1293 tty->print_cr("vtable statistics:"); | |
| 1294 tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); | |
| 1295 int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; | |
| 1296 tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); | |
| 1297 tty->print_cr("%6d bytes filler overhead", VtableStats::filler); | |
| 1298 tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); | |
| 1299 tty->print_cr("%6d bytes total", total); | |
| 1300 } | |
| 1301 | |
| 1302 bool klassVtable::check_no_old_entries() { | |
| 1303 // Check that there really is no entry | |
| 1304 for (int i = 0; i < length(); i++) { | |
| 1305 methodOop m = unchecked_method_at(i); | |
| 1306 if (m != NULL) { | |
| 1307 if (m->is_old()) { | |
| 1308 return false; | |
| 1309 } | |
| 1310 } | |
| 1311 } | |
| 1312 return true; | |
| 1313 } | |
| 1314 | |
| 1315 void klassVtable::dump_vtable() { | |
| 1316 tty->print_cr("vtable dump --"); | |
| 1317 for (int i = 0; i < length(); i++) { | |
| 1318 methodOop m = unchecked_method_at(i); | |
| 1319 if (m != NULL) { | |
| 1320 tty->print(" (%5d) ", i); | |
| 1321 m->access_flags().print_on(tty); | |
| 1322 tty->print(" -- "); | |
| 1323 m->print_name(tty); | |
| 1324 tty->cr(); | |
| 1325 } | |
| 1326 } | |
| 1327 } | |
| 1328 | |
| 1329 int klassItable::_total_classes; // Total no. of classes with itables | |
| 1330 long klassItable::_total_size; // Total no. of bytes used for itables | |
| 1331 | |
| 1332 void klassItable::print_statistics() { | |
| 1333 tty->print_cr("itable statistics:"); | |
| 1334 tty->print_cr("%6d classes with itables", _total_classes); | |
| 1335 tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); | |
| 1336 } | |
| 1337 | |
| 1338 #endif // PRODUCT |