Tue, 11 Nov 2014 11:05:41 +0100
8056071: compiler/whitebox/IsMethodCompilableTest.java fails with 'method() is not compilable after 3 iterations'
Summary: Always use MDO if valid and always compile trivial methods with C1 if available.
Reviewed-by: kvn, iveresov
duke@435 | 1 | /* |
lfoltan@6632 | 2 | * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 27 | #include "classfile/vmSymbols.hpp" |
stefank@2314 | 28 | #include "gc_implementation/shared/markSweep.inline.hpp" |
stefank@2314 | 29 | #include "memory/gcLocker.hpp" |
stefank@2314 | 30 | #include "memory/resourceArea.hpp" |
stefank@2314 | 31 | #include "memory/universe.inline.hpp" |
stefank@2314 | 32 | #include "oops/instanceKlass.hpp" |
stefank@2314 | 33 | #include "oops/klassVtable.hpp" |
coleenp@4037 | 34 | #include "oops/method.hpp" |
stefank@2314 | 35 | #include "oops/objArrayOop.hpp" |
stefank@2314 | 36 | #include "oops/oop.inline.hpp" |
stefank@2314 | 37 | #include "prims/jvmtiRedefineClassesTrace.hpp" |
stefank@2314 | 38 | #include "runtime/arguments.hpp" |
stefank@2314 | 39 | #include "runtime/handles.inline.hpp" |
stefank@2314 | 40 | #include "utilities/copy.hpp" |
duke@435 | 41 | |
drchase@6680 | 42 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
drchase@6680 | 43 | |
coleenp@4037 | 44 | inline InstanceKlass* klassVtable::ik() const { |
coleenp@4037 | 45 | Klass* k = _klass(); |
coleenp@4037 | 46 | assert(k->oop_is_instance(), "not an InstanceKlass"); |
coleenp@4037 | 47 | return (InstanceKlass*)k; |
duke@435 | 48 | } |
duke@435 | 49 | |
duke@435 | 50 | |
duke@435 | 51 | // this function computes the vtable size (including the size needed for miranda |
drchase@5732 | 52 | // methods) and the number of miranda methods in this class. |
duke@435 | 53 | // Note on Miranda methods: Let's say there is a class C that implements |
drchase@5732 | 54 | // interface I, and none of C's superclasses implements I. |
drchase@5732 | 55 | // Let's say there is an abstract method m in I that neither C |
drchase@5732 | 56 | // nor any of its super classes implement (i.e there is no method of any access, |
drchase@5732 | 57 | // with the same name and signature as m), then m is a Miranda method which is |
duke@435 | 58 | // entered as a public abstract method in C's vtable. From then on it should |
duke@435 | 59 | // treated as any other public method in C for method over-ride purposes. |
kamg@4245 | 60 | void klassVtable::compute_vtable_size_and_num_mirandas( |
kamg@4245 | 61 | int* vtable_length_ret, int* num_new_mirandas, |
kamg@4245 | 62 | GrowableArray<Method*>* all_mirandas, Klass* super, |
kamg@4245 | 63 | Array<Method*>* methods, AccessFlags class_flags, |
kamg@4245 | 64 | Handle classloader, Symbol* classname, Array<Klass*>* local_interfaces, |
kamg@4245 | 65 | TRAPS) { |
duke@435 | 66 | No_Safepoint_Verifier nsv; |
duke@435 | 67 | |
duke@435 | 68 | // set up default result values |
kamg@4245 | 69 | int vtable_length = 0; |
duke@435 | 70 | |
duke@435 | 71 | // start off with super's vtable length |
coleenp@4037 | 72 | InstanceKlass* sk = (InstanceKlass*)super; |
duke@435 | 73 | vtable_length = super == NULL ? 0 : sk->vtable_length(); |
duke@435 | 74 | |
duke@435 | 75 | // go thru each method in the methods table to see if it needs a new entry |
duke@435 | 76 | int len = methods->length(); |
duke@435 | 77 | for (int i = 0; i < len; i++) { |
coleenp@4037 | 78 | assert(methods->at(i)->is_method(), "must be a Method*"); |
coleenp@4037 | 79 | methodHandle mh(THREAD, methods->at(i)); |
duke@435 | 80 | |
acorn@1087 | 81 | if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
duke@435 | 82 | vtable_length += vtableEntry::size(); // we need a new entry |
duke@435 | 83 | } |
duke@435 | 84 | } |
duke@435 | 85 | |
kamg@4245 | 86 | GrowableArray<Method*> new_mirandas(20); |
duke@435 | 87 | // compute the number of mirandas methods that must be added to the end |
acorn@5848 | 88 | get_mirandas(&new_mirandas, all_mirandas, super, methods, NULL, local_interfaces); |
kamg@4245 | 89 | *num_new_mirandas = new_mirandas.length(); |
kamg@4245 | 90 | |
acorn@6080 | 91 | // Interfaces do not need interface methods in their vtables |
acorn@6080 | 92 | // This includes miranda methods and during later processing, default methods |
acorn@6080 | 93 | if (!class_flags.is_interface()) { |
acorn@6080 | 94 | vtable_length += *num_new_mirandas * vtableEntry::size(); |
acorn@6080 | 95 | } |
duke@435 | 96 | |
duke@435 | 97 | if (Universe::is_bootstrapping() && vtable_length == 0) { |
duke@435 | 98 | // array classes don't have their superclass set correctly during |
duke@435 | 99 | // bootstrapping |
duke@435 | 100 | vtable_length = Universe::base_vtable_size(); |
duke@435 | 101 | } |
duke@435 | 102 | |
duke@435 | 103 | if (super == NULL && !Universe::is_bootstrapping() && |
duke@435 | 104 | vtable_length != Universe::base_vtable_size()) { |
duke@435 | 105 | // Someone is attempting to redefine java.lang.Object incorrectly. The |
duke@435 | 106 | // only way this should happen is from |
duke@435 | 107 | // SystemDictionary::resolve_from_stream(), which will detect this later |
duke@435 | 108 | // and throw a security exception. So don't assert here to let |
duke@435 | 109 | // the exception occur. |
duke@435 | 110 | vtable_length = Universe::base_vtable_size(); |
duke@435 | 111 | } |
duke@435 | 112 | assert(super != NULL || vtable_length == Universe::base_vtable_size(), |
duke@435 | 113 | "bad vtable size for class Object"); |
duke@435 | 114 | assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); |
duke@435 | 115 | assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); |
kamg@4245 | 116 | |
kamg@4245 | 117 | *vtable_length_ret = vtable_length; |
duke@435 | 118 | } |
duke@435 | 119 | |
coleenp@4037 | 120 | int klassVtable::index_of(Method* m, int len) const { |
drchase@5732 | 121 | assert(m->has_vtable_index(), "do not ask this of non-vtable methods"); |
duke@435 | 122 | return m->vtable_index(); |
duke@435 | 123 | } |
duke@435 | 124 | |
drchase@5732 | 125 | // Copy super class's vtable to the first part (prefix) of this class's vtable, |
drchase@5732 | 126 | // and return the number of entries copied. Expects that 'super' is the Java |
drchase@5732 | 127 | // super class (arrays can have "array" super classes that must be skipped). |
duke@435 | 128 | int klassVtable::initialize_from_super(KlassHandle super) { |
duke@435 | 129 | if (super.is_null()) { |
duke@435 | 130 | return 0; |
duke@435 | 131 | } else { |
duke@435 | 132 | // copy methods from superKlass |
coleenp@4037 | 133 | // can't inherit from array class, so must be InstanceKlass |
duke@435 | 134 | assert(super->oop_is_instance(), "must be instance klass"); |
coleenp@4037 | 135 | InstanceKlass* sk = (InstanceKlass*)super(); |
duke@435 | 136 | klassVtable* superVtable = sk->vtable(); |
duke@435 | 137 | assert(superVtable->length() <= _length, "vtable too short"); |
duke@435 | 138 | #ifdef ASSERT |
duke@435 | 139 | superVtable->verify(tty, true); |
duke@435 | 140 | #endif |
duke@435 | 141 | superVtable->copy_vtable_to(table()); |
duke@435 | 142 | #ifndef PRODUCT |
duke@435 | 143 | if (PrintVtables && Verbose) { |
acorn@1087 | 144 | ResourceMark rm; |
duke@435 | 145 | tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
duke@435 | 146 | } |
duke@435 | 147 | #endif |
duke@435 | 148 | return superVtable->length(); |
duke@435 | 149 | } |
duke@435 | 150 | } |
duke@435 | 151 | |
drchase@5732 | 152 | // |
drchase@5732 | 153 | // Revised lookup semantics introduced 1.3 (Kestrel beta) |
duke@435 | 154 | void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { |
duke@435 | 155 | |
duke@435 | 156 | // Note: Arrays can have intermediate array supers. Use java_super to skip them. |
duke@435 | 157 | KlassHandle super (THREAD, klass()->java_super()); |
duke@435 | 158 | int nofNewEntries = 0; |
duke@435 | 159 | |
duke@435 | 160 | if (PrintVtables && !klass()->oop_is_array()) { |
duke@435 | 161 | ResourceMark rm(THREAD); |
duke@435 | 162 | tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); |
duke@435 | 163 | } |
duke@435 | 164 | |
duke@435 | 165 | #ifdef ASSERT |
duke@435 | 166 | oop* end_of_obj = (oop*)_klass() + _klass()->size(); |
duke@435 | 167 | oop* end_of_vtable = (oop*)&table()[_length]; |
duke@435 | 168 | assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); |
duke@435 | 169 | #endif |
duke@435 | 170 | |
duke@435 | 171 | if (Universe::is_bootstrapping()) { |
duke@435 | 172 | // just clear everything |
duke@435 | 173 | for (int i = 0; i < _length; i++) table()[i].clear(); |
duke@435 | 174 | return; |
duke@435 | 175 | } |
duke@435 | 176 | |
duke@435 | 177 | int super_vtable_len = initialize_from_super(super); |
duke@435 | 178 | if (klass()->oop_is_array()) { |
duke@435 | 179 | assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); |
duke@435 | 180 | } else { |
coleenp@4037 | 181 | assert(_klass->oop_is_instance(), "must be InstanceKlass"); |
duke@435 | 182 | |
coleenp@4037 | 183 | Array<Method*>* methods = ik()->methods(); |
coleenp@4037 | 184 | int len = methods->length(); |
duke@435 | 185 | int initialized = super_vtable_len; |
duke@435 | 186 | |
drchase@5732 | 187 | // Check each of this class's methods against super; |
drchase@5732 | 188 | // if override, replace in copy of super vtable, otherwise append to end |
duke@435 | 189 | for (int i = 0; i < len; i++) { |
drchase@5732 | 190 | // update_inherited_vtable can stop for gc - ensure using handles |
duke@435 | 191 | HandleMark hm(THREAD); |
coleenp@4037 | 192 | assert(methods->at(i)->is_method(), "must be a Method*"); |
coleenp@4037 | 193 | methodHandle mh(THREAD, methods->at(i)); |
duke@435 | 194 | |
acorn@5848 | 195 | bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, -1, checkconstraints, CHECK); |
duke@435 | 196 | |
duke@435 | 197 | if (needs_new_entry) { |
duke@435 | 198 | put_method_at(mh(), initialized); |
duke@435 | 199 | mh()->set_vtable_index(initialized); // set primary vtable index |
duke@435 | 200 | initialized++; |
duke@435 | 201 | } |
duke@435 | 202 | } |
duke@435 | 203 | |
acorn@5848 | 204 | // update vtable with default_methods |
acorn@5848 | 205 | Array<Method*>* default_methods = ik()->default_methods(); |
acorn@5848 | 206 | if (default_methods != NULL) { |
acorn@5848 | 207 | len = default_methods->length(); |
acorn@5848 | 208 | if (len > 0) { |
acorn@5848 | 209 | Array<int>* def_vtable_indices = NULL; |
acorn@5848 | 210 | if ((def_vtable_indices = ik()->default_vtable_indices()) == NULL) { |
acorn@5848 | 211 | def_vtable_indices = ik()->create_new_default_vtable_indices(len, CHECK); |
acorn@5848 | 212 | } else { |
acorn@5848 | 213 | assert(def_vtable_indices->length() == len, "reinit vtable len?"); |
acorn@5848 | 214 | } |
acorn@5848 | 215 | for (int i = 0; i < len; i++) { |
acorn@5848 | 216 | HandleMark hm(THREAD); |
acorn@5848 | 217 | assert(default_methods->at(i)->is_method(), "must be a Method*"); |
acorn@5848 | 218 | methodHandle mh(THREAD, default_methods->at(i)); |
acorn@5848 | 219 | |
acorn@5848 | 220 | bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, i, checkconstraints, CHECK); |
acorn@5848 | 221 | |
acorn@5848 | 222 | // needs new entry |
acorn@5848 | 223 | if (needs_new_entry) { |
acorn@5848 | 224 | put_method_at(mh(), initialized); |
acorn@5848 | 225 | def_vtable_indices->at_put(i, initialized); //set vtable index |
acorn@5848 | 226 | initialized++; |
acorn@5848 | 227 | } |
acorn@5848 | 228 | } |
acorn@5848 | 229 | } |
acorn@5848 | 230 | } |
acorn@5848 | 231 | |
acorn@5848 | 232 | // add miranda methods; it will also return the updated initialized |
acorn@6080 | 233 | // Interfaces do not need interface methods in their vtables |
acorn@6080 | 234 | // This includes miranda methods and during later processing, default methods |
acorn@6080 | 235 | if (!ik()->is_interface()) { |
acorn@6080 | 236 | initialized = fill_in_mirandas(initialized); |
acorn@6080 | 237 | } |
duke@435 | 238 | |
acorn@1087 | 239 | // In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
drchase@5732 | 240 | // package_private -> public/protected), the vtable might actually be smaller than our initial |
duke@435 | 241 | // calculation. |
duke@435 | 242 | assert(initialized <= _length, "vtable initialization failed"); |
duke@435 | 243 | for(;initialized < _length; initialized++) { |
duke@435 | 244 | put_method_at(NULL, initialized); |
duke@435 | 245 | } |
duke@435 | 246 | NOT_PRODUCT(verify(tty, true)); |
duke@435 | 247 | } |
duke@435 | 248 | } |
duke@435 | 249 | |
acorn@1087 | 250 | // Called for cases where a method does not override its superclass' vtable entry |
acorn@1087 | 251 | // For bytecodes not produced by javac together it is possible that a method does not override |
acorn@1087 | 252 | // the superclass's method, but might indirectly override a super-super class's vtable entry |
acorn@1087 | 253 | // If none found, return a null superk, else return the superk of the method this does override |
hseigel@6759 | 254 | // For public and protected methods: if they override a superclass, they will |
hseigel@6759 | 255 | // also be overridden themselves appropriately. |
hseigel@6759 | 256 | // Private methods do not override and are not overridden. |
hseigel@6759 | 257 | // Package Private methods are trickier: |
hseigel@6759 | 258 | // e.g. P1.A, pub m |
hseigel@6759 | 259 | // P2.B extends A, package private m |
hseigel@6759 | 260 | // P1.C extends B, public m |
hseigel@6759 | 261 | // P1.C.m needs to override P1.A.m and can not override P2.B.m |
hseigel@6759 | 262 | // Therefore: all package private methods need their own vtable entries for |
hseigel@6759 | 263 | // them to be the root of an inheritance overriding decision |
hseigel@6759 | 264 | // Package private methods may also override other vtable entries |
coleenp@4037 | 265 | InstanceKlass* klassVtable::find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, |
coleenp@2497 | 266 | int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) { |
coleenp@4037 | 267 | InstanceKlass* superk = initialsuper; |
acorn@1087 | 268 | while (superk != NULL && superk->super() != NULL) { |
coleenp@4037 | 269 | InstanceKlass* supersuperklass = InstanceKlass::cast(superk->super()); |
acorn@1087 | 270 | klassVtable* ssVtable = supersuperklass->vtable(); |
acorn@1087 | 271 | if (vtable_index < ssVtable->length()) { |
coleenp@4037 | 272 | Method* super_method = ssVtable->method_at(vtable_index); |
acorn@1087 | 273 | #ifndef PRODUCT |
coleenp@2497 | 274 | Symbol* name= target_method()->name(); |
coleenp@2497 | 275 | Symbol* signature = target_method()->signature(); |
coleenp@2497 | 276 | assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch"); |
acorn@1087 | 277 | #endif |
acorn@1087 | 278 | if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
acorn@1087 | 279 | #ifndef PRODUCT |
acorn@1087 | 280 | if (PrintVtables && Verbose) { |
acorn@1087 | 281 | ResourceMark rm(THREAD); |
acorn@5848 | 282 | char* sig = target_method()->name_and_sig_as_C_string(); |
acorn@1087 | 283 | tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
acorn@1087 | 284 | supersuperklass->internal_name(), |
acorn@5848 | 285 | _klass->internal_name(), sig, vtable_index); |
acorn@1087 | 286 | super_method->access_flags().print_on(tty); |
acorn@5848 | 287 | if (super_method->is_default_method()) { |
acorn@6080 | 288 | tty->print("default "); |
acorn@5848 | 289 | } |
acorn@1087 | 290 | tty->print("overriders flags: "); |
acorn@1087 | 291 | target_method->access_flags().print_on(tty); |
acorn@5848 | 292 | if (target_method->is_default_method()) { |
acorn@6080 | 293 | tty->print("default "); |
acorn@5848 | 294 | } |
acorn@1087 | 295 | } |
acorn@1087 | 296 | #endif /*PRODUCT*/ |
acorn@1087 | 297 | break; // return found superk |
acorn@1087 | 298 | } |
acorn@1087 | 299 | } else { |
acorn@1087 | 300 | // super class has no vtable entry here, stop transitive search |
coleenp@4037 | 301 | superk = (InstanceKlass*)NULL; |
acorn@1087 | 302 | break; |
acorn@1087 | 303 | } |
acorn@1087 | 304 | // if no override found yet, continue to search up |
coleenp@4037 | 305 | superk = InstanceKlass::cast(superk->super()); |
acorn@1087 | 306 | } |
duke@435 | 307 | |
acorn@1087 | 308 | return superk; |
duke@435 | 309 | } |
duke@435 | 310 | |
duke@435 | 311 | // Update child's copy of super vtable for overrides |
drchase@5732 | 312 | // OR return true if a new vtable entry is required. |
coleenp@4037 | 313 | // Only called for InstanceKlass's, i.e. not for arrays |
duke@435 | 314 | // If that changed, could not use _klass as handle for klass |
acorn@5848 | 315 | bool klassVtable::update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, |
acorn@5848 | 316 | int super_vtable_len, int default_index, |
acorn@5848 | 317 | bool checkconstraints, TRAPS) { |
duke@435 | 318 | ResourceMark rm; |
duke@435 | 319 | bool allocate_new = true; |
coleenp@4037 | 320 | assert(klass->oop_is_instance(), "must be InstanceKlass"); |
duke@435 | 321 | |
acorn@5848 | 322 | Array<int>* def_vtable_indices = NULL; |
acorn@5848 | 323 | bool is_default = false; |
acorn@5848 | 324 | // default methods are concrete methods in superinterfaces which are added to the vtable |
acorn@5848 | 325 | // with their real method_holder |
acorn@5848 | 326 | // Since vtable and itable indices share the same storage, don't touch |
acorn@5848 | 327 | // the default method's real vtable/itable index |
acorn@5848 | 328 | // default_vtable_indices stores the vtable value relative to this inheritor |
acorn@5848 | 329 | if (default_index >= 0 ) { |
acorn@5848 | 330 | is_default = true; |
acorn@5848 | 331 | def_vtable_indices = klass->default_vtable_indices(); |
acorn@5848 | 332 | assert(def_vtable_indices != NULL, "def vtable alloc?"); |
acorn@5848 | 333 | assert(default_index <= def_vtable_indices->length(), "def vtable len?"); |
acorn@5848 | 334 | } else { |
acorn@5848 | 335 | assert(klass == target_method()->method_holder(), "caller resp."); |
acorn@5848 | 336 | // Initialize the method's vtable index to "nonvirtual". |
acorn@5848 | 337 | // If we allocate a vtable entry, we will update it to a non-negative number. |
acorn@5848 | 338 | target_method()->set_vtable_index(Method::nonvirtual_vtable_index); |
acorn@5848 | 339 | } |
duke@435 | 340 | |
duke@435 | 341 | // Static and <init> methods are never in |
duke@435 | 342 | if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { |
duke@435 | 343 | return false; |
duke@435 | 344 | } |
duke@435 | 345 | |
drchase@5732 | 346 | if (target_method->is_final_method(klass->access_flags())) { |
duke@435 | 347 | // a final method never needs a new entry; final methods can be statically |
duke@435 | 348 | // resolved and they have to be present in the vtable only if they override |
duke@435 | 349 | // a super's method, in which case they re-use its entry |
duke@435 | 350 | allocate_new = false; |
drchase@5732 | 351 | } else if (klass->is_interface()) { |
drchase@5732 | 352 | allocate_new = false; // see note below in needs_new_vtable_entry |
drchase@5732 | 353 | // An interface never allocates new vtable slots, only inherits old ones. |
drchase@5732 | 354 | // This method will either be assigned its own itable index later, |
drchase@5732 | 355 | // or be assigned an inherited vtable index in the loop below. |
acorn@6080 | 356 | // default methods inherited by classes store their vtable indices |
acorn@6080 | 357 | // in the inheritor's default_vtable_indices |
acorn@6080 | 358 | // default methods inherited by interfaces may already have a |
acorn@6080 | 359 | // valid itable index, if so, don't change it |
acorn@6080 | 360 | // overpass methods in an interface will be assigned an itable index later |
acorn@6080 | 361 | // by an inheriting class |
acorn@6080 | 362 | if (!is_default || !target_method()->has_itable_index()) { |
acorn@6080 | 363 | target_method()->set_vtable_index(Method::pending_itable_index); |
acorn@6080 | 364 | } |
duke@435 | 365 | } |
duke@435 | 366 | |
duke@435 | 367 | // we need a new entry if there is no superclass |
duke@435 | 368 | if (klass->super() == NULL) { |
duke@435 | 369 | return allocate_new; |
duke@435 | 370 | } |
duke@435 | 371 | |
acorn@5786 | 372 | // private methods in classes always have a new entry in the vtable |
acorn@1087 | 373 | // specification interpretation since classic has |
acorn@1087 | 374 | // private methods not overriding |
acorn@5786 | 375 | // JDK8 adds private methods in interfaces which require invokespecial |
duke@435 | 376 | if (target_method()->is_private()) { |
duke@435 | 377 | return allocate_new; |
duke@435 | 378 | } |
duke@435 | 379 | |
duke@435 | 380 | // search through the vtable and update overridden entries |
duke@435 | 381 | // Since check_signature_loaders acquires SystemDictionary_lock |
acorn@1087 | 382 | // which can block for gc, once we are in this loop, use handles |
acorn@1087 | 383 | // For classfiles built with >= jdk7, we now look for transitive overrides |
duke@435 | 384 | |
coleenp@2497 | 385 | Symbol* name = target_method()->name(); |
coleenp@2497 | 386 | Symbol* signature = target_method()->signature(); |
acorn@5848 | 387 | |
acorn@5848 | 388 | KlassHandle target_klass(THREAD, target_method()->method_holder()); |
acorn@5848 | 389 | if (target_klass == NULL) { |
acorn@5848 | 390 | target_klass = _klass; |
acorn@5848 | 391 | } |
acorn@5848 | 392 | |
acorn@5848 | 393 | Handle target_loader(THREAD, target_klass->class_loader()); |
acorn@5848 | 394 | |
acorn@5848 | 395 | Symbol* target_classname = target_klass->name(); |
duke@435 | 396 | for(int i = 0; i < super_vtable_len; i++) { |
coleenp@4037 | 397 | Method* super_method = method_at(i); |
duke@435 | 398 | // Check if method name matches |
coleenp@2497 | 399 | if (super_method->name() == name && super_method->signature() == signature) { |
duke@435 | 400 | |
acorn@1087 | 401 | // get super_klass for method_holder for the found method |
coleenp@4251 | 402 | InstanceKlass* super_klass = super_method->method_holder(); |
duke@435 | 403 | |
acorn@5848 | 404 | if (is_default |
acorn@5848 | 405 | || ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) |
acorn@5848 | 406 | || ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
acorn@5848 | 407 | && ((super_klass = find_transitive_override(super_klass, |
acorn@5848 | 408 | target_method, i, target_loader, |
acorn@5848 | 409 | target_classname, THREAD)) |
acorn@5848 | 410 | != (InstanceKlass*)NULL)))) |
acorn@5848 | 411 | { |
hseigel@6759 | 412 | // Package private methods always need a new entry to root their own |
hseigel@6759 | 413 | // overriding. They may also override other methods. |
hseigel@6759 | 414 | if (!target_method()->is_package_private()) { |
hseigel@6759 | 415 | allocate_new = false; |
hseigel@6759 | 416 | } |
duke@435 | 417 | |
duke@435 | 418 | if (checkconstraints) { |
duke@435 | 419 | // Override vtable entry if passes loader constraint check |
duke@435 | 420 | // if loader constraint checking requested |
duke@435 | 421 | // No need to visit his super, since he and his super |
duke@435 | 422 | // have already made any needed loader constraints. |
duke@435 | 423 | // Since loader constraints are transitive, it is enough |
duke@435 | 424 | // to link to the first super, and we get all the others. |
duke@435 | 425 | Handle super_loader(THREAD, super_klass->class_loader()); |
duke@435 | 426 | |
acorn@1087 | 427 | if (target_loader() != super_loader()) { |
duke@435 | 428 | ResourceMark rm(THREAD); |
acorn@4840 | 429 | Symbol* failed_type_symbol = |
acorn@1087 | 430 | SystemDictionary::check_signature_loaders(signature, target_loader, |
duke@435 | 431 | super_loader, true, |
duke@435 | 432 | CHECK_(false)); |
acorn@4840 | 433 | if (failed_type_symbol != NULL) { |
duke@435 | 434 | const char* msg = "loader constraint violation: when resolving " |
duke@435 | 435 | "overridden method \"%s\" the class loader (instance" |
duke@435 | 436 | " of %s) of the current class, %s, and its superclass loader " |
duke@435 | 437 | "(instance of %s), have different Class objects for the type " |
duke@435 | 438 | "%s used in the signature"; |
duke@435 | 439 | char* sig = target_method()->name_and_sig_as_C_string(); |
acorn@1087 | 440 | const char* loader1 = SystemDictionary::loader_name(target_loader()); |
acorn@5848 | 441 | char* current = target_klass->name()->as_C_string(); |
duke@435 | 442 | const char* loader2 = SystemDictionary::loader_name(super_loader()); |
acorn@4840 | 443 | char* failed_type_name = failed_type_symbol->as_C_string(); |
duke@435 | 444 | size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
duke@435 | 445 | strlen(current) + strlen(loader2) + strlen(failed_type_name); |
duke@435 | 446 | char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); |
duke@435 | 447 | jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, |
duke@435 | 448 | failed_type_name); |
duke@435 | 449 | THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); |
duke@435 | 450 | } |
duke@435 | 451 | } |
acorn@1087 | 452 | } |
acorn@1087 | 453 | |
acorn@5848 | 454 | put_method_at(target_method(), i); |
acorn@5848 | 455 | if (!is_default) { |
acorn@5848 | 456 | target_method()->set_vtable_index(i); |
acorn@5848 | 457 | } else { |
acorn@5848 | 458 | if (def_vtable_indices != NULL) { |
acorn@5848 | 459 | def_vtable_indices->at_put(default_index, i); |
acorn@5848 | 460 | } |
acorn@5848 | 461 | assert(super_method->is_default_method() || super_method->is_overpass() |
acorn@5848 | 462 | || super_method->is_abstract(), "default override error"); |
acorn@5848 | 463 | } |
acorn@5848 | 464 | |
acorn@5848 | 465 | |
acorn@1087 | 466 | #ifndef PRODUCT |
acorn@1087 | 467 | if (PrintVtables && Verbose) { |
acorn@5848 | 468 | ResourceMark rm(THREAD); |
acorn@5848 | 469 | char* sig = target_method()->name_and_sig_as_C_string(); |
acorn@1087 | 470 | tty->print("overriding with %s::%s index %d, original flags: ", |
acorn@5848 | 471 | target_klass->internal_name(), sig, i); |
acorn@1087 | 472 | super_method->access_flags().print_on(tty); |
acorn@5848 | 473 | if (super_method->is_default_method()) { |
acorn@6080 | 474 | tty->print("default "); |
acorn@5848 | 475 | } |
acorn@5848 | 476 | if (super_method->is_overpass()) { |
acorn@5848 | 477 | tty->print("overpass"); |
acorn@5848 | 478 | } |
acorn@1087 | 479 | tty->print("overriders flags: "); |
acorn@1087 | 480 | target_method->access_flags().print_on(tty); |
acorn@5848 | 481 | if (target_method->is_default_method()) { |
acorn@6080 | 482 | tty->print("default "); |
acorn@5848 | 483 | } |
acorn@5848 | 484 | if (target_method->is_overpass()) { |
acorn@5848 | 485 | tty->print("overpass"); |
acorn@5848 | 486 | } |
acorn@1087 | 487 | tty->cr(); |
duke@435 | 488 | } |
acorn@1087 | 489 | #endif /*PRODUCT*/ |
acorn@1087 | 490 | } else { |
acorn@1087 | 491 | // allocate_new = true; default. We might override one entry, |
acorn@1087 | 492 | // but not override another. Once we override one, not need new |
duke@435 | 493 | #ifndef PRODUCT |
acorn@1087 | 494 | if (PrintVtables && Verbose) { |
acorn@5848 | 495 | ResourceMark rm(THREAD); |
acorn@5848 | 496 | char* sig = target_method()->name_and_sig_as_C_string(); |
acorn@1087 | 497 | tty->print("NOT overriding with %s::%s index %d, original flags: ", |
acorn@5848 | 498 | target_klass->internal_name(), sig,i); |
acorn@1087 | 499 | super_method->access_flags().print_on(tty); |
acorn@5848 | 500 | if (super_method->is_default_method()) { |
acorn@6080 | 501 | tty->print("default "); |
acorn@5848 | 502 | } |
acorn@5848 | 503 | if (super_method->is_overpass()) { |
acorn@5848 | 504 | tty->print("overpass"); |
acorn@5848 | 505 | } |
acorn@1087 | 506 | tty->print("overriders flags: "); |
acorn@1087 | 507 | target_method->access_flags().print_on(tty); |
acorn@5848 | 508 | if (target_method->is_default_method()) { |
acorn@6080 | 509 | tty->print("default "); |
acorn@5848 | 510 | } |
acorn@5848 | 511 | if (target_method->is_overpass()) { |
acorn@5848 | 512 | tty->print("overpass"); |
acorn@5848 | 513 | } |
acorn@1087 | 514 | tty->cr(); |
acorn@1087 | 515 | } |
duke@435 | 516 | #endif /*PRODUCT*/ |
duke@435 | 517 | } |
duke@435 | 518 | } |
duke@435 | 519 | } |
duke@435 | 520 | return allocate_new; |
duke@435 | 521 | } |
duke@435 | 522 | |
coleenp@4037 | 523 | void klassVtable::put_method_at(Method* m, int index) { |
duke@435 | 524 | #ifndef PRODUCT |
duke@435 | 525 | if (PrintVtables && Verbose) { |
acorn@1087 | 526 | ResourceMark rm; |
acorn@6080 | 527 | const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>"; |
acorn@6080 | 528 | tty->print("adding %s at index %d, flags: ", sig, index); |
acorn@6080 | 529 | if (m != NULL) { |
acorn@6080 | 530 | m->access_flags().print_on(tty); |
acorn@6080 | 531 | if (m->is_default_method()) { |
acorn@6080 | 532 | tty->print("default "); |
acorn@6080 | 533 | } |
acorn@6080 | 534 | if (m->is_overpass()) { |
acorn@6080 | 535 | tty->print("overpass"); |
acorn@6080 | 536 | } |
acorn@6080 | 537 | } |
acorn@6080 | 538 | tty->cr(); |
duke@435 | 539 | } |
duke@435 | 540 | #endif |
duke@435 | 541 | table()[index].set(m); |
duke@435 | 542 | } |
duke@435 | 543 | |
duke@435 | 544 | // Find out if a method "m" with superclass "super", loader "classloader" and |
duke@435 | 545 | // name "classname" needs a new vtable entry. Let P be a class package defined |
duke@435 | 546 | // by "classloader" and "classname". |
duke@435 | 547 | // NOTE: The logic used here is very similar to the one used for computing |
duke@435 | 548 | // the vtables indices for a method. We cannot directly use that function because, |
coleenp@4037 | 549 | // we allocate the InstanceKlass at load time, and that requires that the |
acorn@1087 | 550 | // superclass has been loaded. |
acorn@1087 | 551 | // However, the vtable entries are filled in at link time, and therefore |
acorn@1087 | 552 | // the superclass' vtable may not yet have been filled in. |
acorn@1087 | 553 | bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
coleenp@4037 | 554 | Klass* super, |
acorn@1087 | 555 | Handle classloader, |
coleenp@2497 | 556 | Symbol* classname, |
acorn@1087 | 557 | AccessFlags class_flags, |
acorn@1087 | 558 | TRAPS) { |
drchase@5732 | 559 | if (class_flags.is_interface()) { |
hseigel@6759 | 560 | // Interfaces do not use vtables, except for java.lang.Object methods, |
hseigel@6759 | 561 | // so there is no point to assigning |
hseigel@6759 | 562 | // a vtable index to any of their local methods. If we refrain from doing this, |
drchase@5732 | 563 | // we can use Method::_vtable_index to hold the itable index |
drchase@5732 | 564 | return false; |
drchase@5732 | 565 | } |
kamg@4245 | 566 | |
drchase@5732 | 567 | if (target_method->is_final_method(class_flags) || |
duke@435 | 568 | // a final method never needs a new entry; final methods can be statically |
duke@435 | 569 | // resolved and they have to be present in the vtable only if they override |
duke@435 | 570 | // a super's method, in which case they re-use its entry |
acorn@1087 | 571 | (target_method()->is_static()) || |
duke@435 | 572 | // static methods don't need to be in vtable |
acorn@1087 | 573 | (target_method()->name() == vmSymbols::object_initializer_name()) |
duke@435 | 574 | // <init> is never called dynamically-bound |
duke@435 | 575 | ) { |
duke@435 | 576 | return false; |
duke@435 | 577 | } |
duke@435 | 578 | |
acorn@5848 | 579 | // Concrete interface methods do not need new entries, they override |
acorn@5848 | 580 | // abstract method entries using default inheritance rules |
acorn@5848 | 581 | if (target_method()->method_holder() != NULL && |
acorn@5848 | 582 | target_method()->method_holder()->is_interface() && |
acorn@5848 | 583 | !target_method()->is_abstract() ) { |
acorn@5848 | 584 | return false; |
acorn@5848 | 585 | } |
acorn@5848 | 586 | |
duke@435 | 587 | // we need a new entry if there is no superclass |
duke@435 | 588 | if (super == NULL) { |
duke@435 | 589 | return true; |
duke@435 | 590 | } |
duke@435 | 591 | |
acorn@5786 | 592 | // private methods in classes always have a new entry in the vtable |
acorn@1087 | 593 | // specification interpretation since classic has |
acorn@1087 | 594 | // private methods not overriding |
acorn@5848 | 595 | // JDK8 adds private methods in interfaces which require invokespecial |
acorn@1087 | 596 | if (target_method()->is_private()) { |
duke@435 | 597 | return true; |
duke@435 | 598 | } |
duke@435 | 599 | |
hseigel@6759 | 600 | // Package private methods always need a new entry to root their own |
hseigel@6759 | 601 | // overriding. This allows transitive overriding to work. |
hseigel@6759 | 602 | if (target_method()->is_package_private()) { |
hseigel@6759 | 603 | return true; |
hseigel@6759 | 604 | } |
hseigel@6759 | 605 | |
duke@435 | 606 | // search through the super class hierarchy to see if we need |
duke@435 | 607 | // a new entry |
acorn@1087 | 608 | ResourceMark rm; |
coleenp@2497 | 609 | Symbol* name = target_method()->name(); |
coleenp@2497 | 610 | Symbol* signature = target_method()->signature(); |
coleenp@4037 | 611 | Klass* k = super; |
coleenp@4037 | 612 | Method* super_method = NULL; |
coleenp@4037 | 613 | InstanceKlass *holder = NULL; |
coleenp@4037 | 614 | Method* recheck_method = NULL; |
duke@435 | 615 | while (k != NULL) { |
duke@435 | 616 | // lookup through the hierarchy for a method with matching name and sign. |
coleenp@4037 | 617 | super_method = InstanceKlass::cast(k)->lookup_method(name, signature); |
acorn@1087 | 618 | if (super_method == NULL) { |
duke@435 | 619 | break; // we still have to search for a matching miranda method |
duke@435 | 620 | } |
duke@435 | 621 | // get the class holding the matching method |
acorn@1087 | 622 | // make sure you use that class for is_override |
coleenp@4251 | 623 | InstanceKlass* superk = super_method->method_holder(); |
acorn@1087 | 624 | // we want only instance method matches |
acorn@1087 | 625 | // pretend private methods are not in the super vtable |
acorn@1087 | 626 | // since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
acorn@1087 | 627 | // ignore private, c.m pub does override a.m pub |
acorn@1087 | 628 | // For classes that were not javac'd together, we also do transitive overriding around |
acorn@1087 | 629 | // methods that have less accessibility |
acorn@1087 | 630 | if ((!super_method->is_static()) && |
acorn@1087 | 631 | (!super_method->is_private())) { |
acorn@1087 | 632 | if (superk->is_override(super_method, classloader, classname, THREAD)) { |
duke@435 | 633 | return false; |
acorn@1087 | 634 | // else keep looking for transitive overrides |
duke@435 | 635 | } |
duke@435 | 636 | } |
duke@435 | 637 | |
acorn@1087 | 638 | // Start with lookup result and continue to search up |
acorn@1087 | 639 | k = superk->super(); // haven't found an override match yet; continue to look |
duke@435 | 640 | } |
duke@435 | 641 | |
duke@435 | 642 | // if the target method is public or protected it may have a matching |
duke@435 | 643 | // miranda method in the super, whose entry it should re-use. |
acorn@1087 | 644 | // Actually, to handle cases that javac would not generate, we need |
acorn@1087 | 645 | // this check for all access permissions. |
coleenp@4037 | 646 | InstanceKlass *sk = InstanceKlass::cast(super); |
acorn@1087 | 647 | if (sk->has_miranda_methods()) { |
lfoltan@6632 | 648 | if (sk->lookup_method_in_all_interfaces(name, signature, Klass::normal) != NULL) { |
acorn@1087 | 649 | return false; // found a matching miranda; we do not need a new entry |
duke@435 | 650 | } |
duke@435 | 651 | } |
duke@435 | 652 | return true; // found no match; we need a new entry |
duke@435 | 653 | } |
duke@435 | 654 | |
duke@435 | 655 | // Support for miranda methods |
duke@435 | 656 | |
duke@435 | 657 | // get the vtable index of a miranda method with matching "name" and "signature" |
coleenp@2497 | 658 | int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) { |
duke@435 | 659 | // search from the bottom, might be faster |
duke@435 | 660 | for (int i = (length() - 1); i >= 0; i--) { |
coleenp@4037 | 661 | Method* m = table()[i].method(); |
duke@435 | 662 | if (is_miranda_entry_at(i) && |
duke@435 | 663 | m->name() == name && m->signature() == signature) { |
duke@435 | 664 | return i; |
duke@435 | 665 | } |
duke@435 | 666 | } |
coleenp@4037 | 667 | return Method::invalid_vtable_index; |
duke@435 | 668 | } |
duke@435 | 669 | |
drchase@5732 | 670 | // check if an entry at an index is miranda |
drchase@5732 | 671 | // requires that method m at entry be declared ("held") by an interface. |
duke@435 | 672 | bool klassVtable::is_miranda_entry_at(int i) { |
coleenp@4037 | 673 | Method* m = method_at(i); |
coleenp@4037 | 674 | Klass* method_holder = m->method_holder(); |
coleenp@4037 | 675 | InstanceKlass *mhk = InstanceKlass::cast(method_holder); |
duke@435 | 676 | |
acorn@5786 | 677 | // miranda methods are public abstract instance interface methods in a class's vtable |
duke@435 | 678 | if (mhk->is_interface()) { |
kamg@4245 | 679 | assert(m->is_public(), "should be public"); |
duke@435 | 680 | assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); |
acorn@6080 | 681 | // the search could find a miranda or a default method |
acorn@6080 | 682 | if (is_miranda(m, ik()->methods(), ik()->default_methods(), ik()->super())) { |
acorn@6080 | 683 | return true; |
acorn@6080 | 684 | } |
duke@435 | 685 | } |
duke@435 | 686 | return false; |
duke@435 | 687 | } |
duke@435 | 688 | |
acorn@5848 | 689 | // check if a method is a miranda method, given a class's methods table, |
acorn@5848 | 690 | // its default_method table and its super |
acorn@6145 | 691 | // Miranda methods are calculated twice: |
acorn@6145 | 692 | // first: before vtable size calculation: including abstract and default |
acorn@6145 | 693 | // This is seen by default method creation |
acorn@6145 | 694 | // Second: recalculated during vtable initialization: only abstract |
acorn@6145 | 695 | // This is seen by link resolution and selection. |
acorn@5848 | 696 | // "miranda" means not static, not defined by this class. |
acorn@5848 | 697 | // private methods in interfaces do not belong in the miranda list. |
duke@435 | 698 | // the caller must make sure that the method belongs to an interface implemented by the class |
acorn@5786 | 699 | // Miranda methods only include public interface instance methods |
acorn@5848 | 700 | // Not private methods, not static methods, not default == concrete abstract |
acorn@6080 | 701 | // Miranda methods also do not include overpass methods in interfaces |
acorn@5848 | 702 | bool klassVtable::is_miranda(Method* m, Array<Method*>* class_methods, |
acorn@5848 | 703 | Array<Method*>* default_methods, Klass* super) { |
acorn@6080 | 704 | if (m->is_static() || m->is_private() || m->is_overpass()) { |
bharadwaj@4998 | 705 | return false; |
bharadwaj@4998 | 706 | } |
coleenp@2497 | 707 | Symbol* name = m->name(); |
coleenp@2497 | 708 | Symbol* signature = m->signature(); |
acorn@6145 | 709 | |
acorn@6145 | 710 | if (InstanceKlass::find_instance_method(class_methods, name, signature) == NULL) { |
dsamersoff@2360 | 711 | // did not find it in the method table of the current class |
acorn@5848 | 712 | if ((default_methods == NULL) || |
acorn@5848 | 713 | InstanceKlass::find_method(default_methods, name, signature) == NULL) { |
acorn@5848 | 714 | if (super == NULL) { |
acorn@5848 | 715 | // super doesn't exist |
acorn@5848 | 716 | return true; |
acorn@5848 | 717 | } |
dsamersoff@2360 | 718 | |
acorn@5848 | 719 | Method* mo = InstanceKlass::cast(super)->lookup_method(name, signature); |
acorn@6145 | 720 | while (mo != NULL && mo->access_flags().is_static() |
acorn@6145 | 721 | && mo->method_holder() != NULL |
acorn@6145 | 722 | && mo->method_holder()->super() != NULL) |
acorn@6145 | 723 | { |
lfoltan@6632 | 724 | mo = mo->method_holder()->super()->uncached_lookup_method(name, signature, Klass::normal); |
acorn@6145 | 725 | } |
acorn@5848 | 726 | if (mo == NULL || mo->access_flags().is_private() ) { |
acorn@5848 | 727 | // super class hierarchy does not implement it or protection is different |
acorn@5848 | 728 | return true; |
acorn@5848 | 729 | } |
duke@435 | 730 | } |
duke@435 | 731 | } |
dsamersoff@2360 | 732 | |
duke@435 | 733 | return false; |
duke@435 | 734 | } |
duke@435 | 735 | |
drchase@5732 | 736 | // Scans current_interface_methods for miranda methods that do not |
acorn@5848 | 737 | // already appear in new_mirandas, or default methods, and are also not defined-and-non-private |
drchase@5732 | 738 | // in super (superclass). These mirandas are added to all_mirandas if it is |
drchase@5732 | 739 | // not null; in addition, those that are not duplicates of miranda methods |
drchase@5732 | 740 | // inherited by super from its interfaces are added to new_mirandas. |
drchase@5732 | 741 | // Thus, new_mirandas will be the set of mirandas that this class introduces, |
drchase@5732 | 742 | // all_mirandas will be the set of all mirandas applicable to this class |
drchase@5732 | 743 | // including all defined in superclasses. |
kamg@4245 | 744 | void klassVtable::add_new_mirandas_to_lists( |
kamg@4245 | 745 | GrowableArray<Method*>* new_mirandas, GrowableArray<Method*>* all_mirandas, |
kamg@4245 | 746 | Array<Method*>* current_interface_methods, Array<Method*>* class_methods, |
acorn@5848 | 747 | Array<Method*>* default_methods, Klass* super) { |
acorn@5848 | 748 | |
duke@435 | 749 | // iterate thru the current interface's method to see if it a miranda |
duke@435 | 750 | int num_methods = current_interface_methods->length(); |
duke@435 | 751 | for (int i = 0; i < num_methods; i++) { |
coleenp@4037 | 752 | Method* im = current_interface_methods->at(i); |
duke@435 | 753 | bool is_duplicate = false; |
kamg@4245 | 754 | int num_of_current_mirandas = new_mirandas->length(); |
duke@435 | 755 | // check for duplicate mirandas in different interfaces we implement |
duke@435 | 756 | for (int j = 0; j < num_of_current_mirandas; j++) { |
kamg@4245 | 757 | Method* miranda = new_mirandas->at(j); |
duke@435 | 758 | if ((im->name() == miranda->name()) && |
duke@435 | 759 | (im->signature() == miranda->signature())) { |
duke@435 | 760 | is_duplicate = true; |
duke@435 | 761 | break; |
duke@435 | 762 | } |
duke@435 | 763 | } |
duke@435 | 764 | |
duke@435 | 765 | if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable |
acorn@5848 | 766 | if (is_miranda(im, class_methods, default_methods, super)) { // is it a miranda at all? |
coleenp@4037 | 767 | InstanceKlass *sk = InstanceKlass::cast(super); |
duke@435 | 768 | // check if it is a duplicate of a super's miranda |
lfoltan@6632 | 769 | if (sk->lookup_method_in_all_interfaces(im->name(), im->signature(), Klass::normal) == NULL) { |
kamg@4245 | 770 | new_mirandas->append(im); |
kamg@4245 | 771 | } |
kamg@4245 | 772 | if (all_mirandas != NULL) { |
kamg@4245 | 773 | all_mirandas->append(im); |
duke@435 | 774 | } |
duke@435 | 775 | } |
duke@435 | 776 | } |
duke@435 | 777 | } |
duke@435 | 778 | } |
duke@435 | 779 | |
kamg@4245 | 780 | void klassVtable::get_mirandas(GrowableArray<Method*>* new_mirandas, |
kamg@4245 | 781 | GrowableArray<Method*>* all_mirandas, |
coleenp@4037 | 782 | Klass* super, Array<Method*>* class_methods, |
acorn@5848 | 783 | Array<Method*>* default_methods, |
coleenp@4037 | 784 | Array<Klass*>* local_interfaces) { |
kamg@4245 | 785 | assert((new_mirandas->length() == 0) , "current mirandas must be 0"); |
duke@435 | 786 | |
duke@435 | 787 | // iterate thru the local interfaces looking for a miranda |
duke@435 | 788 | int num_local_ifs = local_interfaces->length(); |
duke@435 | 789 | for (int i = 0; i < num_local_ifs; i++) { |
coleenp@4037 | 790 | InstanceKlass *ik = InstanceKlass::cast(local_interfaces->at(i)); |
kamg@4245 | 791 | add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
acorn@5848 | 792 | ik->methods(), class_methods, |
acorn@5848 | 793 | default_methods, super); |
duke@435 | 794 | // iterate thru each local's super interfaces |
coleenp@4037 | 795 | Array<Klass*>* super_ifs = ik->transitive_interfaces(); |
duke@435 | 796 | int num_super_ifs = super_ifs->length(); |
duke@435 | 797 | for (int j = 0; j < num_super_ifs; j++) { |
coleenp@4037 | 798 | InstanceKlass *sik = InstanceKlass::cast(super_ifs->at(j)); |
kamg@4245 | 799 | add_new_mirandas_to_lists(new_mirandas, all_mirandas, |
acorn@5848 | 800 | sik->methods(), class_methods, |
acorn@5848 | 801 | default_methods, super); |
duke@435 | 802 | } |
duke@435 | 803 | } |
duke@435 | 804 | } |
duke@435 | 805 | |
drchase@5732 | 806 | // Discover miranda methods ("miranda" = "interface abstract, no binding"), |
drchase@5732 | 807 | // and append them into the vtable starting at index initialized, |
drchase@5732 | 808 | // return the new value of initialized. |
acorn@6080 | 809 | // Miranda methods use vtable entries, but do not get assigned a vtable_index |
acorn@6080 | 810 | // The vtable_index is discovered by searching from the end of the vtable |
drchase@5732 | 811 | int klassVtable::fill_in_mirandas(int initialized) { |
kamg@4245 | 812 | GrowableArray<Method*> mirandas(20); |
kamg@4245 | 813 | get_mirandas(&mirandas, NULL, ik()->super(), ik()->methods(), |
acorn@5848 | 814 | ik()->default_methods(), ik()->local_interfaces()); |
kamg@4245 | 815 | for (int i = 0; i < mirandas.length(); i++) { |
acorn@5848 | 816 | if (PrintVtables && Verbose) { |
acorn@5848 | 817 | Method* meth = mirandas.at(i); |
acorn@5848 | 818 | ResourceMark rm(Thread::current()); |
acorn@5848 | 819 | if (meth != NULL) { |
acorn@5848 | 820 | char* sig = meth->name_and_sig_as_C_string(); |
acorn@5848 | 821 | tty->print("fill in mirandas with %s index %d, flags: ", |
acorn@5848 | 822 | sig, initialized); |
acorn@5848 | 823 | meth->access_flags().print_on(tty); |
acorn@5848 | 824 | if (meth->is_default_method()) { |
acorn@6080 | 825 | tty->print("default "); |
acorn@5848 | 826 | } |
acorn@5848 | 827 | tty->cr(); |
acorn@5848 | 828 | } |
acorn@5848 | 829 | } |
drchase@5732 | 830 | put_method_at(mirandas.at(i), initialized); |
drchase@5732 | 831 | ++initialized; |
duke@435 | 832 | } |
drchase@5732 | 833 | return initialized; |
duke@435 | 834 | } |
duke@435 | 835 | |
drchase@5732 | 836 | // Copy this class's vtable to the vtable beginning at start. |
drchase@5732 | 837 | // Used to copy superclass vtable to prefix of subclass's vtable. |
duke@435 | 838 | void klassVtable::copy_vtable_to(vtableEntry* start) { |
duke@435 | 839 | Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); |
duke@435 | 840 | } |
duke@435 | 841 | |
dcubed@4562 | 842 | #if INCLUDE_JVMTI |
acorn@5848 | 843 | bool klassVtable::adjust_default_method(int vtable_index, Method* old_method, Method* new_method) { |
acorn@5848 | 844 | // If old_method is default, find this vtable index in default_vtable_indices |
acorn@5848 | 845 | // and replace that method in the _default_methods list |
acorn@5848 | 846 | bool updated = false; |
acorn@5848 | 847 | |
acorn@5848 | 848 | Array<Method*>* default_methods = ik()->default_methods(); |
acorn@5848 | 849 | if (default_methods != NULL) { |
acorn@5848 | 850 | int len = default_methods->length(); |
acorn@5848 | 851 | for (int idx = 0; idx < len; idx++) { |
acorn@5848 | 852 | if (vtable_index == ik()->default_vtable_indices()->at(idx)) { |
acorn@5848 | 853 | if (default_methods->at(idx) == old_method) { |
acorn@5848 | 854 | default_methods->at_put(idx, new_method); |
acorn@5848 | 855 | updated = true; |
acorn@5848 | 856 | } |
acorn@5848 | 857 | break; |
acorn@5848 | 858 | } |
acorn@5848 | 859 | } |
acorn@5848 | 860 | } |
acorn@5848 | 861 | return updated; |
acorn@5848 | 862 | } |
coleenp@4037 | 863 | void klassVtable::adjust_method_entries(Method** old_methods, Method** new_methods, |
duke@435 | 864 | int methods_length, bool * trace_name_printed) { |
duke@435 | 865 | // search the vtable for uses of either obsolete or EMCP methods |
duke@435 | 866 | for (int j = 0; j < methods_length; j++) { |
coleenp@4037 | 867 | Method* old_method = old_methods[j]; |
coleenp@4037 | 868 | Method* new_method = new_methods[j]; |
duke@435 | 869 | |
duke@435 | 870 | // In the vast majority of cases we could get the vtable index |
duke@435 | 871 | // by using: old_method->vtable_index() |
duke@435 | 872 | // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() |
duke@435 | 873 | // in sun.awt.X11.XFramePeer where methods occur more than once in the |
duke@435 | 874 | // vtable, so, alas, we must do an exhaustive search. |
duke@435 | 875 | for (int index = 0; index < length(); index++) { |
duke@435 | 876 | if (unchecked_method_at(index) == old_method) { |
duke@435 | 877 | put_method_at(new_method, index); |
acorn@5848 | 878 | // For default methods, need to update the _default_methods array |
acorn@5848 | 879 | // which can only have one method entry for a given signature |
acorn@5848 | 880 | bool updated_default = false; |
acorn@5848 | 881 | if (old_method->is_default_method()) { |
acorn@5848 | 882 | updated_default = adjust_default_method(index, old_method, new_method); |
acorn@5848 | 883 | } |
duke@435 | 884 | |
duke@435 | 885 | if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
duke@435 | 886 | if (!(*trace_name_printed)) { |
duke@435 | 887 | // RC_TRACE_MESG macro has an embedded ResourceMark |
acorn@5848 | 888 | RC_TRACE_MESG(("adjust: klassname=%s for methods from name=%s", |
acorn@5848 | 889 | klass()->external_name(), |
coleenp@4251 | 890 | old_method->method_holder()->external_name())); |
duke@435 | 891 | *trace_name_printed = true; |
duke@435 | 892 | } |
duke@435 | 893 | // RC_TRACE macro has an embedded ResourceMark |
acorn@5848 | 894 | RC_TRACE(0x00100000, ("vtable method update: %s(%s), updated default = %s", |
duke@435 | 895 | new_method->name()->as_C_string(), |
acorn@5848 | 896 | new_method->signature()->as_C_string(), |
acorn@5848 | 897 | updated_default ? "true" : "false")); |
duke@435 | 898 | } |
dcubed@4562 | 899 | // cannot 'break' here; see for-loop comment above. |
duke@435 | 900 | } |
duke@435 | 901 | } |
duke@435 | 902 | } |
duke@435 | 903 | } |
duke@435 | 904 | |
dcubed@4562 | 905 | // a vtable should never contain old or obsolete methods |
dcubed@4562 | 906 | bool klassVtable::check_no_old_or_obsolete_entries() { |
dcubed@4562 | 907 | for (int i = 0; i < length(); i++) { |
dcubed@4562 | 908 | Method* m = unchecked_method_at(i); |
dcubed@4562 | 909 | if (m != NULL && |
dcubed@4562 | 910 | (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
dcubed@4562 | 911 | return false; |
dcubed@4562 | 912 | } |
dcubed@4562 | 913 | } |
dcubed@4562 | 914 | return true; |
dcubed@4562 | 915 | } |
dcubed@4562 | 916 | |
dcubed@4562 | 917 | void klassVtable::dump_vtable() { |
dcubed@4562 | 918 | tty->print_cr("vtable dump --"); |
dcubed@4562 | 919 | for (int i = 0; i < length(); i++) { |
dcubed@4562 | 920 | Method* m = unchecked_method_at(i); |
dcubed@4562 | 921 | if (m != NULL) { |
dcubed@4562 | 922 | tty->print(" (%5d) ", i); |
dcubed@4562 | 923 | m->access_flags().print_on(tty); |
acorn@5848 | 924 | if (m->is_default_method()) { |
acorn@6080 | 925 | tty->print("default "); |
acorn@5848 | 926 | } |
acorn@5848 | 927 | if (m->is_overpass()) { |
acorn@5848 | 928 | tty->print("overpass"); |
acorn@5848 | 929 | } |
dcubed@4562 | 930 | tty->print(" -- "); |
dcubed@4562 | 931 | m->print_name(tty); |
dcubed@4562 | 932 | tty->cr(); |
dcubed@4562 | 933 | } |
dcubed@4562 | 934 | } |
dcubed@4562 | 935 | } |
dcubed@4562 | 936 | #endif // INCLUDE_JVMTI |
dcubed@4562 | 937 | |
coleenp@2777 | 938 | // CDS/RedefineClasses support - clear vtables so they can be reinitialized |
coleenp@2777 | 939 | void klassVtable::clear_vtable() { |
coleenp@2777 | 940 | for (int i = 0; i < _length; i++) table()[i].clear(); |
coleenp@2777 | 941 | } |
coleenp@2777 | 942 | |
coleenp@2777 | 943 | bool klassVtable::is_initialized() { |
coleenp@2777 | 944 | return _length == 0 || table()[0].method() != NULL; |
coleenp@2777 | 945 | } |
coleenp@2777 | 946 | |
duke@435 | 947 | //----------------------------------------------------------------------------------------- |
duke@435 | 948 | // Itable code |
duke@435 | 949 | |
duke@435 | 950 | // Initialize a itableMethodEntry |
coleenp@4037 | 951 | void itableMethodEntry::initialize(Method* m) { |
duke@435 | 952 | if (m == NULL) return; |
duke@435 | 953 | |
duke@435 | 954 | _method = m; |
duke@435 | 955 | } |
duke@435 | 956 | |
duke@435 | 957 | klassItable::klassItable(instanceKlassHandle klass) { |
duke@435 | 958 | _klass = klass; |
duke@435 | 959 | |
duke@435 | 960 | if (klass->itable_length() > 0) { |
duke@435 | 961 | itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); |
duke@435 | 962 | if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized |
duke@435 | 963 | // First offset entry points to the first method_entry |
coleenp@4037 | 964 | intptr_t* method_entry = (intptr_t *)(((address)klass()) + offset_entry->offset()); |
duke@435 | 965 | intptr_t* end = klass->end_of_itable(); |
duke@435 | 966 | |
coleenp@4037 | 967 | _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass(); |
duke@435 | 968 | _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); |
duke@435 | 969 | _size_method_table = (end - method_entry) / itableMethodEntry::size(); |
duke@435 | 970 | assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); |
duke@435 | 971 | return; |
duke@435 | 972 | } |
duke@435 | 973 | } |
duke@435 | 974 | |
dcubed@451 | 975 | // The length of the itable was either zero, or it has not yet been initialized. |
duke@435 | 976 | _table_offset = 0; |
duke@435 | 977 | _size_offset_table = 0; |
duke@435 | 978 | _size_method_table = 0; |
duke@435 | 979 | } |
duke@435 | 980 | |
duke@435 | 981 | static int initialize_count = 0; |
duke@435 | 982 | |
duke@435 | 983 | // Initialization |
duke@435 | 984 | void klassItable::initialize_itable(bool checkconstraints, TRAPS) { |
drchase@5732 | 985 | if (_klass->is_interface()) { |
acorn@5848 | 986 | // This needs to go after vtable indices are assigned but |
acorn@5848 | 987 | // before implementors need to know the number of itable indices. |
acorn@5848 | 988 | assign_itable_indices_for_interface(_klass()); |
drchase@5732 | 989 | } |
drchase@5732 | 990 | |
dcubed@451 | 991 | // Cannot be setup doing bootstrapping, interfaces don't have |
dcubed@451 | 992 | // itables, and klass with only ones entry have empty itables |
dcubed@451 | 993 | if (Universe::is_bootstrapping() || |
dcubed@451 | 994 | _klass->is_interface() || |
dcubed@451 | 995 | _klass->itable_length() == itableOffsetEntry::size()) return; |
duke@435 | 996 | |
dcubed@451 | 997 | // There's alway an extra itable entry so we can null-terminate it. |
dcubed@451 | 998 | guarantee(size_offset_table() >= 1, "too small"); |
dcubed@451 | 999 | int num_interfaces = size_offset_table() - 1; |
duke@435 | 1000 | if (num_interfaces > 0) { |
dcubed@451 | 1001 | if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
dcubed@451 | 1002 | _klass->name()->as_C_string()); |
duke@435 | 1003 | |
duke@435 | 1004 | |
acorn@1087 | 1005 | // Iterate through all interfaces |
duke@435 | 1006 | int i; |
duke@435 | 1007 | for(i = 0; i < num_interfaces; i++) { |
duke@435 | 1008 | itableOffsetEntry* ioe = offset_entry(i); |
coleenp@4037 | 1009 | HandleMark hm(THREAD); |
duke@435 | 1010 | KlassHandle interf_h (THREAD, ioe->interface_klass()); |
duke@435 | 1011 | assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); |
duke@435 | 1012 | initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); |
duke@435 | 1013 | } |
duke@435 | 1014 | |
duke@435 | 1015 | } |
dcubed@451 | 1016 | // Check that the last entry is empty |
dcubed@451 | 1017 | itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
dcubed@451 | 1018 | guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
duke@435 | 1019 | } |
duke@435 | 1020 | |
duke@435 | 1021 | |
drchase@5732 | 1022 | inline bool interface_method_needs_itable_index(Method* m) { |
drchase@5732 | 1023 | if (m->is_static()) return false; // e.g., Stream.empty |
drchase@5732 | 1024 | if (m->is_initializer()) return false; // <init> or <clinit> |
drchase@5732 | 1025 | // If an interface redeclares a method from java.lang.Object, |
drchase@5732 | 1026 | // it should already have a vtable index, don't touch it. |
drchase@5732 | 1027 | // e.g., CharSequence.toString (from initialize_vtable) |
drchase@5732 | 1028 | // if (m->has_vtable_index()) return false; // NO! |
drchase@5732 | 1029 | return true; |
drchase@5732 | 1030 | } |
drchase@5732 | 1031 | |
acorn@5848 | 1032 | int klassItable::assign_itable_indices_for_interface(Klass* klass) { |
drchase@5732 | 1033 | // an interface does not have an itable, but its methods need to be numbered |
drchase@5732 | 1034 | if (TraceItables) tty->print_cr("%3d: Initializing itable for interface %s", ++initialize_count, |
drchase@5732 | 1035 | klass->name()->as_C_string()); |
drchase@5732 | 1036 | Array<Method*>* methods = InstanceKlass::cast(klass)->methods(); |
drchase@5732 | 1037 | int nof_methods = methods->length(); |
drchase@5732 | 1038 | int ime_num = 0; |
drchase@5732 | 1039 | for (int i = 0; i < nof_methods; i++) { |
drchase@5732 | 1040 | Method* m = methods->at(i); |
drchase@5732 | 1041 | if (interface_method_needs_itable_index(m)) { |
drchase@5732 | 1042 | assert(!m->is_final_method(), "no final interface methods"); |
drchase@5732 | 1043 | // If m is already assigned a vtable index, do not disturb it. |
acorn@6080 | 1044 | if (TraceItables && Verbose) { |
acorn@6080 | 1045 | ResourceMark rm; |
acorn@6080 | 1046 | const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>"; |
acorn@6080 | 1047 | if (m->has_vtable_index()) { |
acorn@6080 | 1048 | tty->print("itable index %d for method: %s, flags: ", m->vtable_index(), sig); |
acorn@6080 | 1049 | } else { |
acorn@6080 | 1050 | tty->print("itable index %d for method: %s, flags: ", ime_num, sig); |
acorn@6080 | 1051 | } |
acorn@6080 | 1052 | if (m != NULL) { |
acorn@6080 | 1053 | m->access_flags().print_on(tty); |
acorn@6080 | 1054 | if (m->is_default_method()) { |
acorn@6080 | 1055 | tty->print("default "); |
acorn@6080 | 1056 | } |
acorn@6080 | 1057 | if (m->is_overpass()) { |
acorn@6080 | 1058 | tty->print("overpass"); |
acorn@6080 | 1059 | } |
acorn@6080 | 1060 | } |
acorn@6080 | 1061 | tty->cr(); |
acorn@6080 | 1062 | } |
drchase@5732 | 1063 | if (!m->has_vtable_index()) { |
drchase@5732 | 1064 | assert(m->vtable_index() == Method::pending_itable_index, "set by initialize_vtable"); |
drchase@5732 | 1065 | m->set_itable_index(ime_num); |
drchase@5732 | 1066 | // Progress to next itable entry |
drchase@5732 | 1067 | ime_num++; |
drchase@5732 | 1068 | } |
drchase@5732 | 1069 | } |
drchase@5732 | 1070 | } |
drchase@5732 | 1071 | assert(ime_num == method_count_for_interface(klass), "proper sizing"); |
drchase@5732 | 1072 | return ime_num; |
drchase@5732 | 1073 | } |
drchase@5732 | 1074 | |
drchase@5732 | 1075 | int klassItable::method_count_for_interface(Klass* interf) { |
drchase@5732 | 1076 | assert(interf->oop_is_instance(), "must be"); |
drchase@5732 | 1077 | assert(interf->is_interface(), "must be"); |
drchase@5732 | 1078 | Array<Method*>* methods = InstanceKlass::cast(interf)->methods(); |
drchase@5732 | 1079 | int nof_methods = methods->length(); |
drchase@5732 | 1080 | while (nof_methods > 0) { |
drchase@5732 | 1081 | Method* m = methods->at(nof_methods-1); |
drchase@5732 | 1082 | if (m->has_itable_index()) { |
drchase@5732 | 1083 | int length = m->itable_index() + 1; |
drchase@5732 | 1084 | #ifdef ASSERT |
drchase@5732 | 1085 | while (nof_methods = 0) { |
drchase@5732 | 1086 | m = methods->at(--nof_methods); |
drchase@5732 | 1087 | assert(!m->has_itable_index() || m->itable_index() < length, ""); |
drchase@5732 | 1088 | } |
drchase@5732 | 1089 | #endif //ASSERT |
drchase@5732 | 1090 | return length; // return the rightmost itable index, plus one |
drchase@5732 | 1091 | } |
drchase@5732 | 1092 | nof_methods -= 1; |
drchase@5732 | 1093 | } |
acorn@5848 | 1094 | // no methods have itable indices |
drchase@5732 | 1095 | return 0; |
drchase@5732 | 1096 | } |
drchase@5732 | 1097 | |
drchase@5732 | 1098 | |
duke@435 | 1099 | void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { |
coleenp@4037 | 1100 | Array<Method*>* methods = InstanceKlass::cast(interf_h())->methods(); |
coleenp@4037 | 1101 | int nof_methods = methods->length(); |
duke@435 | 1102 | HandleMark hm; |
jcoomes@1844 | 1103 | assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
coleenp@4037 | 1104 | Handle interface_loader (THREAD, InstanceKlass::cast(interf_h())->class_loader()); |
duke@435 | 1105 | |
drchase@5732 | 1106 | int ime_count = method_count_for_interface(interf_h()); |
drchase@5732 | 1107 | for (int i = 0; i < nof_methods; i++) { |
coleenp@4037 | 1108 | Method* m = methods->at(i); |
drchase@5732 | 1109 | methodHandle target; |
drchase@5732 | 1110 | if (m->has_itable_index()) { |
hseigel@6195 | 1111 | // This search must match the runtime resolution, i.e. selection search for invokeinterface |
hseigel@6195 | 1112 | // to correctly enforce loader constraints for interface method inheritance |
drchase@5732 | 1113 | LinkResolver::lookup_instance_method_in_klasses(target, _klass, m->name(), m->signature(), CHECK); |
duke@435 | 1114 | } |
duke@435 | 1115 | if (target == NULL || !target->is_public() || target->is_abstract()) { |
drchase@6134 | 1116 | // Entry does not resolve. Leave it empty for AbstractMethodError. |
drchase@6134 | 1117 | if (!(target == NULL) && !target->is_public()) { |
drchase@6134 | 1118 | // Stuff an IllegalAccessError throwing method in there instead. |
drchase@6134 | 1119 | itableOffsetEntry::method_entry(_klass(), method_table_offset)[m->itable_index()]. |
drchase@6134 | 1120 | initialize(Universe::throw_illegal_access_error()); |
drchase@6134 | 1121 | } |
duke@435 | 1122 | } else { |
duke@435 | 1123 | // Entry did resolve, check loader constraints before initializing |
duke@435 | 1124 | // if checkconstraints requested |
duke@435 | 1125 | if (checkconstraints) { |
coleenp@4251 | 1126 | Handle method_holder_loader (THREAD, target->method_holder()->class_loader()); |
duke@435 | 1127 | if (method_holder_loader() != interface_loader()) { |
duke@435 | 1128 | ResourceMark rm(THREAD); |
acorn@4840 | 1129 | Symbol* failed_type_symbol = |
drchase@5732 | 1130 | SystemDictionary::check_signature_loaders(m->signature(), |
duke@435 | 1131 | method_holder_loader, |
duke@435 | 1132 | interface_loader, |
duke@435 | 1133 | true, CHECK); |
acorn@4840 | 1134 | if (failed_type_symbol != NULL) { |
duke@435 | 1135 | const char* msg = "loader constraint violation in interface " |
duke@435 | 1136 | "itable initialization: when resolving method \"%s\" the class" |
duke@435 | 1137 | " loader (instance of %s) of the current class, %s, " |
duke@435 | 1138 | "and the class loader (instance of %s) for interface " |
duke@435 | 1139 | "%s have different Class objects for the type %s " |
duke@435 | 1140 | "used in the signature"; |
drchase@5732 | 1141 | char* sig = target()->name_and_sig_as_C_string(); |
duke@435 | 1142 | const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); |
drchase@5732 | 1143 | char* current = _klass->name()->as_C_string(); |
duke@435 | 1144 | const char* loader2 = SystemDictionary::loader_name(interface_loader()); |
coleenp@4037 | 1145 | char* iface = InstanceKlass::cast(interf_h())->name()->as_C_string(); |
acorn@4840 | 1146 | char* failed_type_name = failed_type_symbol->as_C_string(); |
duke@435 | 1147 | size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
duke@435 | 1148 | strlen(current) + strlen(loader2) + strlen(iface) + |
duke@435 | 1149 | strlen(failed_type_name); |
duke@435 | 1150 | char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); |
duke@435 | 1151 | jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, |
duke@435 | 1152 | iface, failed_type_name); |
duke@435 | 1153 | THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); |
duke@435 | 1154 | } |
duke@435 | 1155 | } |
duke@435 | 1156 | } |
duke@435 | 1157 | |
duke@435 | 1158 | // ime may have moved during GC so recalculate address |
drchase@5732 | 1159 | int ime_num = m->itable_index(); |
drchase@5732 | 1160 | assert(ime_num < ime_count, "oob"); |
drchase@5732 | 1161 | itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target()); |
acorn@5848 | 1162 | if (TraceItables && Verbose) { |
acorn@5848 | 1163 | ResourceMark rm(THREAD); |
acorn@5848 | 1164 | if (target() != NULL) { |
acorn@5848 | 1165 | char* sig = target()->name_and_sig_as_C_string(); |
acorn@5848 | 1166 | tty->print("interface: %s, ime_num: %d, target: %s, method_holder: %s ", |
acorn@5848 | 1167 | interf_h()->internal_name(), ime_num, sig, |
acorn@5848 | 1168 | target()->method_holder()->internal_name()); |
acorn@5848 | 1169 | tty->print("target_method flags: "); |
acorn@5848 | 1170 | target()->access_flags().print_on(tty); |
acorn@5848 | 1171 | if (target()->is_default_method()) { |
acorn@6080 | 1172 | tty->print("default "); |
acorn@5848 | 1173 | } |
acorn@5848 | 1174 | tty->cr(); |
acorn@5848 | 1175 | } |
acorn@5848 | 1176 | } |
duke@435 | 1177 | } |
duke@435 | 1178 | } |
duke@435 | 1179 | } |
duke@435 | 1180 | |
coleenp@4037 | 1181 | // Update entry for specific Method* |
coleenp@4037 | 1182 | void klassItable::initialize_with_method(Method* m) { |
duke@435 | 1183 | itableMethodEntry* ime = method_entry(0); |
duke@435 | 1184 | for(int i = 0; i < _size_method_table; i++) { |
duke@435 | 1185 | if (ime->method() == m) { |
duke@435 | 1186 | ime->initialize(m); |
duke@435 | 1187 | } |
duke@435 | 1188 | ime++; |
duke@435 | 1189 | } |
duke@435 | 1190 | } |
duke@435 | 1191 | |
dcubed@4562 | 1192 | #if INCLUDE_JVMTI |
coleenp@4037 | 1193 | void klassItable::adjust_method_entries(Method** old_methods, Method** new_methods, |
duke@435 | 1194 | int methods_length, bool * trace_name_printed) { |
duke@435 | 1195 | // search the itable for uses of either obsolete or EMCP methods |
duke@435 | 1196 | for (int j = 0; j < methods_length; j++) { |
coleenp@4037 | 1197 | Method* old_method = old_methods[j]; |
coleenp@4037 | 1198 | Method* new_method = new_methods[j]; |
duke@435 | 1199 | itableMethodEntry* ime = method_entry(0); |
duke@435 | 1200 | |
dcubed@1045 | 1201 | // The itable can describe more than one interface and the same |
dcubed@1045 | 1202 | // method signature can be specified by more than one interface. |
dcubed@1045 | 1203 | // This means we have to do an exhaustive search to find all the |
dcubed@1045 | 1204 | // old_method references. |
duke@435 | 1205 | for (int i = 0; i < _size_method_table; i++) { |
duke@435 | 1206 | if (ime->method() == old_method) { |
duke@435 | 1207 | ime->initialize(new_method); |
duke@435 | 1208 | |
duke@435 | 1209 | if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
duke@435 | 1210 | if (!(*trace_name_printed)) { |
duke@435 | 1211 | // RC_TRACE_MESG macro has an embedded ResourceMark |
duke@435 | 1212 | RC_TRACE_MESG(("adjust: name=%s", |
coleenp@4251 | 1213 | old_method->method_holder()->external_name())); |
duke@435 | 1214 | *trace_name_printed = true; |
duke@435 | 1215 | } |
duke@435 | 1216 | // RC_TRACE macro has an embedded ResourceMark |
duke@435 | 1217 | RC_TRACE(0x00200000, ("itable method update: %s(%s)", |
duke@435 | 1218 | new_method->name()->as_C_string(), |
duke@435 | 1219 | new_method->signature()->as_C_string())); |
duke@435 | 1220 | } |
dcubed@4562 | 1221 | // cannot 'break' here; see for-loop comment above. |
duke@435 | 1222 | } |
duke@435 | 1223 | ime++; |
duke@435 | 1224 | } |
duke@435 | 1225 | } |
duke@435 | 1226 | } |
duke@435 | 1227 | |
dcubed@4562 | 1228 | // an itable should never contain old or obsolete methods |
dcubed@4562 | 1229 | bool klassItable::check_no_old_or_obsolete_entries() { |
dcubed@4562 | 1230 | itableMethodEntry* ime = method_entry(0); |
dcubed@4562 | 1231 | for (int i = 0; i < _size_method_table; i++) { |
dcubed@4562 | 1232 | Method* m = ime->method(); |
dcubed@4562 | 1233 | if (m != NULL && |
dcubed@4562 | 1234 | (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) { |
dcubed@4562 | 1235 | return false; |
dcubed@4562 | 1236 | } |
dcubed@4562 | 1237 | ime++; |
dcubed@4562 | 1238 | } |
dcubed@4562 | 1239 | return true; |
dcubed@4562 | 1240 | } |
dcubed@4562 | 1241 | |
dcubed@4562 | 1242 | void klassItable::dump_itable() { |
dcubed@4562 | 1243 | itableMethodEntry* ime = method_entry(0); |
dcubed@4562 | 1244 | tty->print_cr("itable dump --"); |
dcubed@4562 | 1245 | for (int i = 0; i < _size_method_table; i++) { |
dcubed@4562 | 1246 | Method* m = ime->method(); |
dcubed@4562 | 1247 | if (m != NULL) { |
dcubed@4562 | 1248 | tty->print(" (%5d) ", i); |
dcubed@4562 | 1249 | m->access_flags().print_on(tty); |
acorn@5848 | 1250 | if (m->is_default_method()) { |
acorn@6080 | 1251 | tty->print("default "); |
acorn@5848 | 1252 | } |
dcubed@4562 | 1253 | tty->print(" -- "); |
dcubed@4562 | 1254 | m->print_name(tty); |
dcubed@4562 | 1255 | tty->cr(); |
dcubed@4562 | 1256 | } |
dcubed@4562 | 1257 | ime++; |
dcubed@4562 | 1258 | } |
dcubed@4562 | 1259 | } |
dcubed@4562 | 1260 | #endif // INCLUDE_JVMTI |
dcubed@4562 | 1261 | |
duke@435 | 1262 | |
duke@435 | 1263 | // Setup |
duke@435 | 1264 | class InterfaceVisiterClosure : public StackObj { |
duke@435 | 1265 | public: |
coleenp@4037 | 1266 | virtual void doit(Klass* intf, int method_count) = 0; |
duke@435 | 1267 | }; |
duke@435 | 1268 | |
drchase@5732 | 1269 | // Visit all interfaces with at least one itable method |
coleenp@4037 | 1270 | void visit_all_interfaces(Array<Klass*>* transitive_intf, InterfaceVisiterClosure *blk) { |
duke@435 | 1271 | // Handle array argument |
duke@435 | 1272 | for(int i = 0; i < transitive_intf->length(); i++) { |
coleenp@4037 | 1273 | Klass* intf = transitive_intf->at(i); |
hseigel@4278 | 1274 | assert(intf->is_interface(), "sanity check"); |
duke@435 | 1275 | |
drchase@5732 | 1276 | // Find no. of itable methods |
drchase@5732 | 1277 | int method_count = 0; |
drchase@5732 | 1278 | // method_count = klassItable::method_count_for_interface(intf); |
drchase@5732 | 1279 | Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
drchase@5732 | 1280 | if (methods->length() > 0) { |
drchase@5732 | 1281 | for (int i = methods->length(); --i >= 0; ) { |
drchase@5732 | 1282 | if (interface_method_needs_itable_index(methods->at(i))) { |
drchase@5732 | 1283 | method_count++; |
drchase@5732 | 1284 | } |
duke@435 | 1285 | } |
duke@435 | 1286 | } |
duke@435 | 1287 | |
duke@435 | 1288 | // Only count interfaces with at least one method |
duke@435 | 1289 | if (method_count > 0) { |
duke@435 | 1290 | blk->doit(intf, method_count); |
duke@435 | 1291 | } |
duke@435 | 1292 | } |
duke@435 | 1293 | } |
duke@435 | 1294 | |
duke@435 | 1295 | class CountInterfacesClosure : public InterfaceVisiterClosure { |
duke@435 | 1296 | private: |
duke@435 | 1297 | int _nof_methods; |
duke@435 | 1298 | int _nof_interfaces; |
duke@435 | 1299 | public: |
duke@435 | 1300 | CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } |
duke@435 | 1301 | |
duke@435 | 1302 | int nof_methods() const { return _nof_methods; } |
duke@435 | 1303 | int nof_interfaces() const { return _nof_interfaces; } |
duke@435 | 1304 | |
coleenp@4037 | 1305 | void doit(Klass* intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } |
duke@435 | 1306 | }; |
duke@435 | 1307 | |
duke@435 | 1308 | class SetupItableClosure : public InterfaceVisiterClosure { |
duke@435 | 1309 | private: |
duke@435 | 1310 | itableOffsetEntry* _offset_entry; |
duke@435 | 1311 | itableMethodEntry* _method_entry; |
duke@435 | 1312 | address _klass_begin; |
duke@435 | 1313 | public: |
duke@435 | 1314 | SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { |
duke@435 | 1315 | _klass_begin = klass_begin; |
duke@435 | 1316 | _offset_entry = offset_entry; |
duke@435 | 1317 | _method_entry = method_entry; |
duke@435 | 1318 | } |
duke@435 | 1319 | |
duke@435 | 1320 | itableMethodEntry* method_entry() const { return _method_entry; } |
duke@435 | 1321 | |
coleenp@4037 | 1322 | void doit(Klass* intf, int method_count) { |
duke@435 | 1323 | int offset = ((address)_method_entry) - _klass_begin; |
duke@435 | 1324 | _offset_entry->initialize(intf, offset); |
duke@435 | 1325 | _offset_entry++; |
duke@435 | 1326 | _method_entry += method_count; |
duke@435 | 1327 | } |
duke@435 | 1328 | }; |
duke@435 | 1329 | |
coleenp@4037 | 1330 | int klassItable::compute_itable_size(Array<Klass*>* transitive_interfaces) { |
duke@435 | 1331 | // Count no of interfaces and total number of interface methods |
duke@435 | 1332 | CountInterfacesClosure cic; |
coleenp@4037 | 1333 | visit_all_interfaces(transitive_interfaces, &cic); |
duke@435 | 1334 | |
dcubed@451 | 1335 | // There's alway an extra itable entry so we can null-terminate it. |
dcubed@451 | 1336 | int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
duke@435 | 1337 | |
duke@435 | 1338 | // Statistics |
duke@435 | 1339 | update_stats(itable_size * HeapWordSize); |
duke@435 | 1340 | |
duke@435 | 1341 | return itable_size; |
duke@435 | 1342 | } |
duke@435 | 1343 | |
duke@435 | 1344 | |
duke@435 | 1345 | // Fill out offset table and interface klasses into the itable space |
duke@435 | 1346 | void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { |
duke@435 | 1347 | if (klass->itable_length() == 0) return; |
duke@435 | 1348 | assert(!klass->is_interface(), "Should have zero length itable"); |
duke@435 | 1349 | |
duke@435 | 1350 | // Count no of interfaces and total number of interface methods |
duke@435 | 1351 | CountInterfacesClosure cic; |
duke@435 | 1352 | visit_all_interfaces(klass->transitive_interfaces(), &cic); |
duke@435 | 1353 | int nof_methods = cic.nof_methods(); |
duke@435 | 1354 | int nof_interfaces = cic.nof_interfaces(); |
duke@435 | 1355 | |
dcubed@451 | 1356 | // Add one extra entry so we can null-terminate the table |
dcubed@451 | 1357 | nof_interfaces++; |
duke@435 | 1358 | |
coleenp@4037 | 1359 | assert(compute_itable_size(klass->transitive_interfaces()) == |
duke@435 | 1360 | calc_itable_size(nof_interfaces, nof_methods), |
duke@435 | 1361 | "mismatch calculation of itable size"); |
duke@435 | 1362 | |
duke@435 | 1363 | // Fill-out offset table |
duke@435 | 1364 | itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); |
duke@435 | 1365 | itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); |
duke@435 | 1366 | intptr_t* end = klass->end_of_itable(); |
never@2658 | 1367 | assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)"); |
coleenp@548 | 1368 | assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
duke@435 | 1369 | |
duke@435 | 1370 | // Visit all interfaces and initialize itable offset table |
coleenp@4037 | 1371 | SetupItableClosure sic((address)klass(), ioe, ime); |
duke@435 | 1372 | visit_all_interfaces(klass->transitive_interfaces(), &sic); |
duke@435 | 1373 | |
duke@435 | 1374 | #ifdef ASSERT |
duke@435 | 1375 | ime = sic.method_entry(); |
duke@435 | 1376 | oop* v = (oop*) klass->end_of_itable(); |
duke@435 | 1377 | assert( (oop*)(ime) == v, "wrong offset calculation (2)"); |
duke@435 | 1378 | #endif |
duke@435 | 1379 | } |
duke@435 | 1380 | |
duke@435 | 1381 | |
drchase@5732 | 1382 | // inverse to itable_index |
coleenp@4037 | 1383 | Method* klassItable::method_for_itable_index(Klass* intf, int itable_index) { |
coleenp@4037 | 1384 | assert(InstanceKlass::cast(intf)->is_interface(), "sanity check"); |
drchase@5732 | 1385 | assert(intf->verify_itable_index(itable_index), ""); |
coleenp@4037 | 1386 | Array<Method*>* methods = InstanceKlass::cast(intf)->methods(); |
jrose@1100 | 1387 | |
drchase@5732 | 1388 | if (itable_index < 0 || itable_index >= method_count_for_interface(intf)) |
acorn@5848 | 1389 | return NULL; // help caller defend against bad indices |
jrose@1100 | 1390 | |
drchase@5732 | 1391 | int index = itable_index; |
coleenp@4037 | 1392 | Method* m = methods->at(index); |
drchase@5732 | 1393 | int index2 = -1; |
drchase@5732 | 1394 | while (!m->has_itable_index() || |
drchase@5732 | 1395 | (index2 = m->itable_index()) != itable_index) { |
drchase@5732 | 1396 | assert(index2 < itable_index, "monotonic"); |
drchase@5732 | 1397 | if (++index == methods->length()) |
drchase@5732 | 1398 | return NULL; |
drchase@5732 | 1399 | m = methods->at(index); |
drchase@5732 | 1400 | } |
drchase@5732 | 1401 | assert(m->itable_index() == itable_index, "correct inverse"); |
jrose@1100 | 1402 | |
jrose@1100 | 1403 | return m; |
jrose@1100 | 1404 | } |
jrose@1100 | 1405 | |
duke@435 | 1406 | void klassVtable::verify(outputStream* st, bool forced) { |
duke@435 | 1407 | // make sure table is initialized |
duke@435 | 1408 | if (!Universe::is_fully_initialized()) return; |
duke@435 | 1409 | #ifndef PRODUCT |
duke@435 | 1410 | // avoid redundant verifies |
duke@435 | 1411 | if (!forced && _verify_count == Universe::verify_count()) return; |
duke@435 | 1412 | _verify_count = Universe::verify_count(); |
duke@435 | 1413 | #endif |
duke@435 | 1414 | oop* end_of_obj = (oop*)_klass() + _klass()->size(); |
duke@435 | 1415 | oop* end_of_vtable = (oop *)&table()[_length]; |
duke@435 | 1416 | if (end_of_vtable > end_of_obj) { |
jcoomes@1845 | 1417 | fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
jcoomes@1845 | 1418 | "end)", _klass->internal_name())); |
duke@435 | 1419 | } |
duke@435 | 1420 | |
duke@435 | 1421 | for (int i = 0; i < _length; i++) table()[i].verify(this, st); |
duke@435 | 1422 | // verify consistency with superKlass vtable |
coleenp@4037 | 1423 | Klass* super = _klass->super(); |
duke@435 | 1424 | if (super != NULL) { |
coleenp@4037 | 1425 | InstanceKlass* sk = InstanceKlass::cast(super); |
duke@435 | 1426 | klassVtable* vt = sk->vtable(); |
duke@435 | 1427 | for (int i = 0; i < vt->length(); i++) { |
duke@435 | 1428 | verify_against(st, vt, i); |
duke@435 | 1429 | } |
duke@435 | 1430 | } |
duke@435 | 1431 | } |
duke@435 | 1432 | |
duke@435 | 1433 | void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { |
duke@435 | 1434 | vtableEntry* vte = &vt->table()[index]; |
duke@435 | 1435 | if (vte->method()->name() != table()[index].method()->name() || |
duke@435 | 1436 | vte->method()->signature() != table()[index].method()->signature()) { |
duke@435 | 1437 | fatal("mismatched name/signature of vtable entries"); |
duke@435 | 1438 | } |
duke@435 | 1439 | } |
duke@435 | 1440 | |
duke@435 | 1441 | #ifndef PRODUCT |
duke@435 | 1442 | void klassVtable::print() { |
duke@435 | 1443 | ResourceMark rm; |
duke@435 | 1444 | tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); |
duke@435 | 1445 | for (int i = 0; i < length(); i++) { |
duke@435 | 1446 | table()[i].print(); |
duke@435 | 1447 | tty->cr(); |
duke@435 | 1448 | } |
duke@435 | 1449 | } |
duke@435 | 1450 | #endif |
duke@435 | 1451 | |
duke@435 | 1452 | void vtableEntry::verify(klassVtable* vt, outputStream* st) { |
duke@435 | 1453 | NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); |
duke@435 | 1454 | assert(method() != NULL, "must have set method"); |
duke@435 | 1455 | method()->verify(); |
duke@435 | 1456 | // we sub_type, because it could be a miranda method |
duke@435 | 1457 | if (!vt->klass()->is_subtype_of(method()->method_holder())) { |
duke@435 | 1458 | #ifndef PRODUCT |
duke@435 | 1459 | print(); |
duke@435 | 1460 | #endif |
jcoomes@1845 | 1461 | fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
duke@435 | 1462 | } |
duke@435 | 1463 | } |
duke@435 | 1464 | |
duke@435 | 1465 | #ifndef PRODUCT |
duke@435 | 1466 | |
duke@435 | 1467 | void vtableEntry::print() { |
duke@435 | 1468 | ResourceMark rm; |
duke@435 | 1469 | tty->print("vtableEntry %s: ", method()->name()->as_C_string()); |
duke@435 | 1470 | if (Verbose) { |
duke@435 | 1471 | tty->print("m %#lx ", (address)method()); |
duke@435 | 1472 | } |
duke@435 | 1473 | } |
duke@435 | 1474 | |
duke@435 | 1475 | class VtableStats : AllStatic { |
duke@435 | 1476 | public: |
duke@435 | 1477 | static int no_klasses; // # classes with vtables |
duke@435 | 1478 | static int no_array_klasses; // # array classes |
duke@435 | 1479 | static int no_instance_klasses; // # instanceKlasses |
duke@435 | 1480 | static int sum_of_vtable_len; // total # of vtable entries |
duke@435 | 1481 | static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only |
duke@435 | 1482 | static int fixed; // total fixed overhead in bytes |
duke@435 | 1483 | static int filler; // overhead caused by filler bytes |
duke@435 | 1484 | static int entries; // total bytes consumed by vtable entries |
duke@435 | 1485 | static int array_entries; // total bytes consumed by array vtable entries |
duke@435 | 1486 | |
coleenp@4037 | 1487 | static void do_class(Klass* k) { |
coleenp@4037 | 1488 | Klass* kl = k; |
duke@435 | 1489 | klassVtable* vt = kl->vtable(); |
duke@435 | 1490 | if (vt == NULL) return; |
duke@435 | 1491 | no_klasses++; |
duke@435 | 1492 | if (kl->oop_is_instance()) { |
duke@435 | 1493 | no_instance_klasses++; |
duke@435 | 1494 | kl->array_klasses_do(do_class); |
duke@435 | 1495 | } |
duke@435 | 1496 | if (kl->oop_is_array()) { |
duke@435 | 1497 | no_array_klasses++; |
duke@435 | 1498 | sum_of_array_vtable_len += vt->length(); |
duke@435 | 1499 | } |
duke@435 | 1500 | sum_of_vtable_len += vt->length(); |
duke@435 | 1501 | } |
duke@435 | 1502 | |
duke@435 | 1503 | static void compute() { |
duke@435 | 1504 | SystemDictionary::classes_do(do_class); |
duke@435 | 1505 | fixed = no_klasses * oopSize; // vtable length |
duke@435 | 1506 | // filler size is a conservative approximation |
coleenp@4142 | 1507 | filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(InstanceKlass) - sizeof(ArrayKlass) - 1); |
duke@435 | 1508 | entries = sizeof(vtableEntry) * sum_of_vtable_len; |
duke@435 | 1509 | array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; |
duke@435 | 1510 | } |
duke@435 | 1511 | }; |
duke@435 | 1512 | |
duke@435 | 1513 | int VtableStats::no_klasses = 0; |
duke@435 | 1514 | int VtableStats::no_array_klasses = 0; |
duke@435 | 1515 | int VtableStats::no_instance_klasses = 0; |
duke@435 | 1516 | int VtableStats::sum_of_vtable_len = 0; |
duke@435 | 1517 | int VtableStats::sum_of_array_vtable_len = 0; |
duke@435 | 1518 | int VtableStats::fixed = 0; |
duke@435 | 1519 | int VtableStats::filler = 0; |
duke@435 | 1520 | int VtableStats::entries = 0; |
duke@435 | 1521 | int VtableStats::array_entries = 0; |
duke@435 | 1522 | |
duke@435 | 1523 | void klassVtable::print_statistics() { |
duke@435 | 1524 | ResourceMark rm; |
duke@435 | 1525 | HandleMark hm; |
duke@435 | 1526 | VtableStats::compute(); |
duke@435 | 1527 | tty->print_cr("vtable statistics:"); |
duke@435 | 1528 | tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); |
duke@435 | 1529 | int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; |
duke@435 | 1530 | tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); |
duke@435 | 1531 | tty->print_cr("%6d bytes filler overhead", VtableStats::filler); |
duke@435 | 1532 | tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); |
duke@435 | 1533 | tty->print_cr("%6d bytes total", total); |
duke@435 | 1534 | } |
duke@435 | 1535 | |
duke@435 | 1536 | int klassItable::_total_classes; // Total no. of classes with itables |
duke@435 | 1537 | long klassItable::_total_size; // Total no. of bytes used for itables |
duke@435 | 1538 | |
duke@435 | 1539 | void klassItable::print_statistics() { |
duke@435 | 1540 | tty->print_cr("itable statistics:"); |
duke@435 | 1541 | tty->print_cr("%6d classes with itables", _total_classes); |
duke@435 | 1542 | tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); |
duke@435 | 1543 | } |
duke@435 | 1544 | |
duke@435 | 1545 | #endif // PRODUCT |