1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/klassVtable.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,1545 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/systemDictionary.hpp"
1.30 +#include "classfile/vmSymbols.hpp"
1.31 +#include "gc_implementation/shared/markSweep.inline.hpp"
1.32 +#include "memory/gcLocker.hpp"
1.33 +#include "memory/resourceArea.hpp"
1.34 +#include "memory/universe.inline.hpp"
1.35 +#include "oops/instanceKlass.hpp"
1.36 +#include "oops/klassVtable.hpp"
1.37 +#include "oops/method.hpp"
1.38 +#include "oops/objArrayOop.hpp"
1.39 +#include "oops/oop.inline.hpp"
1.40 +#include "prims/jvmtiRedefineClassesTrace.hpp"
1.41 +#include "runtime/arguments.hpp"
1.42 +#include "runtime/handles.inline.hpp"
1.43 +#include "utilities/copy.hpp"
1.44 +
1.45 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.46 +
1.47 +inline InstanceKlass* klassVtable::ik() const {
1.48 + Klass* k = _klass();
1.49 + assert(k->oop_is_instance(), "not an InstanceKlass");
1.50 + return (InstanceKlass*)k;
1.51 +}
1.52 +
1.53 +
1.54 +// this function computes the vtable size (including the size needed for miranda
1.55 +// methods) and the number of miranda methods in this class.
1.56 +// Note on Miranda methods: Let's say there is a class C that implements
1.57 +// interface I, and none of C's superclasses implements I.
1.58 +// Let's say there is an abstract method m in I that neither C
1.59 +// nor any of its super classes implement (i.e there is no method of any access,
1.60 +// with the same name and signature as m), then m is a Miranda method which is
1.61 +// entered as a public abstract method in C's vtable. From then on it should
1.62 +// treated as any other public method in C for method over-ride purposes.
1.63 +void klassVtable::compute_vtable_size_and_num_mirandas(
1.64 + int* vtable_length_ret, int* num_new_mirandas,
1.65 + GrowableArray<Method*>* all_mirandas, Klass* super,
1.66 + Array<Method*>* methods, AccessFlags class_flags,
1.67 + Handle classloader, Symbol* classname, Array<Klass*>* local_interfaces,
1.68 + TRAPS) {
1.69 + No_Safepoint_Verifier nsv;
1.70 +
1.71 + // set up default result values
1.72 + int vtable_length = 0;
1.73 +
1.74 + // start off with super's vtable length
1.75 + InstanceKlass* sk = (InstanceKlass*)super;
1.76 + vtable_length = super == NULL ? 0 : sk->vtable_length();
1.77 +
1.78 + // go thru each method in the methods table to see if it needs a new entry
1.79 + int len = methods->length();
1.80 + for (int i = 0; i < len; i++) {
1.81 + assert(methods->at(i)->is_method(), "must be a Method*");
1.82 + methodHandle mh(THREAD, methods->at(i));
1.83 +
1.84 + if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) {
1.85 + vtable_length += vtableEntry::size(); // we need a new entry
1.86 + }
1.87 + }
1.88 +
1.89 + GrowableArray<Method*> new_mirandas(20);
1.90 + // compute the number of mirandas methods that must be added to the end
1.91 + get_mirandas(&new_mirandas, all_mirandas, super, methods, NULL, local_interfaces);
1.92 + *num_new_mirandas = new_mirandas.length();
1.93 +
1.94 + // Interfaces do not need interface methods in their vtables
1.95 + // This includes miranda methods and during later processing, default methods
1.96 + if (!class_flags.is_interface()) {
1.97 + vtable_length += *num_new_mirandas * vtableEntry::size();
1.98 + }
1.99 +
1.100 + if (Universe::is_bootstrapping() && vtable_length == 0) {
1.101 + // array classes don't have their superclass set correctly during
1.102 + // bootstrapping
1.103 + vtable_length = Universe::base_vtable_size();
1.104 + }
1.105 +
1.106 + if (super == NULL && !Universe::is_bootstrapping() &&
1.107 + vtable_length != Universe::base_vtable_size()) {
1.108 + // Someone is attempting to redefine java.lang.Object incorrectly. The
1.109 + // only way this should happen is from
1.110 + // SystemDictionary::resolve_from_stream(), which will detect this later
1.111 + // and throw a security exception. So don't assert here to let
1.112 + // the exception occur.
1.113 + vtable_length = Universe::base_vtable_size();
1.114 + }
1.115 + assert(super != NULL || vtable_length == Universe::base_vtable_size(),
1.116 + "bad vtable size for class Object");
1.117 + assert(vtable_length % vtableEntry::size() == 0, "bad vtable length");
1.118 + assert(vtable_length >= Universe::base_vtable_size(), "vtable too small");
1.119 +
1.120 + *vtable_length_ret = vtable_length;
1.121 +}
1.122 +
1.123 +int klassVtable::index_of(Method* m, int len) const {
1.124 + assert(m->has_vtable_index(), "do not ask this of non-vtable methods");
1.125 + return m->vtable_index();
1.126 +}
1.127 +
1.128 +// Copy super class's vtable to the first part (prefix) of this class's vtable,
1.129 +// and return the number of entries copied. Expects that 'super' is the Java
1.130 +// super class (arrays can have "array" super classes that must be skipped).
1.131 +int klassVtable::initialize_from_super(KlassHandle super) {
1.132 + if (super.is_null()) {
1.133 + return 0;
1.134 + } else {
1.135 + // copy methods from superKlass
1.136 + // can't inherit from array class, so must be InstanceKlass
1.137 + assert(super->oop_is_instance(), "must be instance klass");
1.138 + InstanceKlass* sk = (InstanceKlass*)super();
1.139 + klassVtable* superVtable = sk->vtable();
1.140 + assert(superVtable->length() <= _length, "vtable too short");
1.141 +#ifdef ASSERT
1.142 + superVtable->verify(tty, true);
1.143 +#endif
1.144 + superVtable->copy_vtable_to(table());
1.145 +#ifndef PRODUCT
1.146 + if (PrintVtables && Verbose) {
1.147 + ResourceMark rm;
1.148 + tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length);
1.149 + }
1.150 +#endif
1.151 + return superVtable->length();
1.152 + }
1.153 +}
1.154 +
1.155 +//
1.156 +// Revised lookup semantics introduced 1.3 (Kestrel beta)
1.157 +void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) {
1.158 +
1.159 + // Note: Arrays can have intermediate array supers. Use java_super to skip them.
1.160 + KlassHandle super (THREAD, klass()->java_super());
1.161 + int nofNewEntries = 0;
1.162 +
1.163 + if (PrintVtables && !klass()->oop_is_array()) {
1.164 + ResourceMark rm(THREAD);
1.165 + tty->print_cr("Initializing: %s", _klass->name()->as_C_string());
1.166 + }
1.167 +
1.168 +#ifdef ASSERT
1.169 + oop* end_of_obj = (oop*)_klass() + _klass()->size();
1.170 + oop* end_of_vtable = (oop*)&table()[_length];
1.171 + assert(end_of_vtable <= end_of_obj, "vtable extends beyond end");
1.172 +#endif
1.173 +
1.174 + if (Universe::is_bootstrapping()) {
1.175 + // just clear everything
1.176 + for (int i = 0; i < _length; i++) table()[i].clear();
1.177 + return;
1.178 + }
1.179 +
1.180 + int super_vtable_len = initialize_from_super(super);
1.181 + if (klass()->oop_is_array()) {
1.182 + assert(super_vtable_len == _length, "arrays shouldn't introduce new methods");
1.183 + } else {
1.184 + assert(_klass->oop_is_instance(), "must be InstanceKlass");
1.185 +
1.186 + Array<Method*>* methods = ik()->methods();
1.187 + int len = methods->length();
1.188 + int initialized = super_vtable_len;
1.189 +
1.190 + // Check each of this class's methods against super;
1.191 + // if override, replace in copy of super vtable, otherwise append to end
1.192 + for (int i = 0; i < len; i++) {
1.193 + // update_inherited_vtable can stop for gc - ensure using handles
1.194 + HandleMark hm(THREAD);
1.195 + assert(methods->at(i)->is_method(), "must be a Method*");
1.196 + methodHandle mh(THREAD, methods->at(i));
1.197 +
1.198 + bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, -1, checkconstraints, CHECK);
1.199 +
1.200 + if (needs_new_entry) {
1.201 + put_method_at(mh(), initialized);
1.202 + mh()->set_vtable_index(initialized); // set primary vtable index
1.203 + initialized++;
1.204 + }
1.205 + }
1.206 +
1.207 + // update vtable with default_methods
1.208 + Array<Method*>* default_methods = ik()->default_methods();
1.209 + if (default_methods != NULL) {
1.210 + len = default_methods->length();
1.211 + if (len > 0) {
1.212 + Array<int>* def_vtable_indices = NULL;
1.213 + if ((def_vtable_indices = ik()->default_vtable_indices()) == NULL) {
1.214 + def_vtable_indices = ik()->create_new_default_vtable_indices(len, CHECK);
1.215 + } else {
1.216 + assert(def_vtable_indices->length() == len, "reinit vtable len?");
1.217 + }
1.218 + for (int i = 0; i < len; i++) {
1.219 + HandleMark hm(THREAD);
1.220 + assert(default_methods->at(i)->is_method(), "must be a Method*");
1.221 + methodHandle mh(THREAD, default_methods->at(i));
1.222 +
1.223 + bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, i, checkconstraints, CHECK);
1.224 +
1.225 + // needs new entry
1.226 + if (needs_new_entry) {
1.227 + put_method_at(mh(), initialized);
1.228 + def_vtable_indices->at_put(i, initialized); //set vtable index
1.229 + initialized++;
1.230 + }
1.231 + }
1.232 + }
1.233 + }
1.234 +
1.235 + // add miranda methods; it will also return the updated initialized
1.236 + // Interfaces do not need interface methods in their vtables
1.237 + // This includes miranda methods and during later processing, default methods
1.238 + if (!ik()->is_interface()) {
1.239 + initialized = fill_in_mirandas(initialized);
1.240 + }
1.241 +
1.242 + // In class hierarchies where the accessibility is not increasing (i.e., going from private ->
1.243 + // package_private -> public/protected), the vtable might actually be smaller than our initial
1.244 + // calculation.
1.245 + assert(initialized <= _length, "vtable initialization failed");
1.246 + for(;initialized < _length; initialized++) {
1.247 + put_method_at(NULL, initialized);
1.248 + }
1.249 + NOT_PRODUCT(verify(tty, true));
1.250 + }
1.251 +}
1.252 +
1.253 +// Called for cases where a method does not override its superclass' vtable entry
1.254 +// For bytecodes not produced by javac together it is possible that a method does not override
1.255 +// the superclass's method, but might indirectly override a super-super class's vtable entry
1.256 +// If none found, return a null superk, else return the superk of the method this does override
1.257 +// For public and protected methods: if they override a superclass, they will
1.258 +// also be overridden themselves appropriately.
1.259 +// Private methods do not override and are not overridden.
1.260 +// Package Private methods are trickier:
1.261 +// e.g. P1.A, pub m
1.262 +// P2.B extends A, package private m
1.263 +// P1.C extends B, public m
1.264 +// P1.C.m needs to override P1.A.m and can not override P2.B.m
1.265 +// Therefore: all package private methods need their own vtable entries for
1.266 +// them to be the root of an inheritance overriding decision
1.267 +// Package private methods may also override other vtable entries
1.268 +InstanceKlass* klassVtable::find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method,
1.269 + int vtable_index, Handle target_loader, Symbol* target_classname, Thread * THREAD) {
1.270 + InstanceKlass* superk = initialsuper;
1.271 + while (superk != NULL && superk->super() != NULL) {
1.272 + InstanceKlass* supersuperklass = InstanceKlass::cast(superk->super());
1.273 + klassVtable* ssVtable = supersuperklass->vtable();
1.274 + if (vtable_index < ssVtable->length()) {
1.275 + Method* super_method = ssVtable->method_at(vtable_index);
1.276 +#ifndef PRODUCT
1.277 + Symbol* name= target_method()->name();
1.278 + Symbol* signature = target_method()->signature();
1.279 + assert(super_method->name() == name && super_method->signature() == signature, "vtable entry name/sig mismatch");
1.280 +#endif
1.281 + if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) {
1.282 +#ifndef PRODUCT
1.283 + if (PrintVtables && Verbose) {
1.284 + ResourceMark rm(THREAD);
1.285 + char* sig = target_method()->name_and_sig_as_C_string();
1.286 + tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ",
1.287 + supersuperklass->internal_name(),
1.288 + _klass->internal_name(), sig, vtable_index);
1.289 + super_method->access_flags().print_on(tty);
1.290 + if (super_method->is_default_method()) {
1.291 + tty->print("default ");
1.292 + }
1.293 + tty->print("overriders flags: ");
1.294 + target_method->access_flags().print_on(tty);
1.295 + if (target_method->is_default_method()) {
1.296 + tty->print("default ");
1.297 + }
1.298 + }
1.299 +#endif /*PRODUCT*/
1.300 + break; // return found superk
1.301 + }
1.302 + } else {
1.303 + // super class has no vtable entry here, stop transitive search
1.304 + superk = (InstanceKlass*)NULL;
1.305 + break;
1.306 + }
1.307 + // if no override found yet, continue to search up
1.308 + superk = InstanceKlass::cast(superk->super());
1.309 + }
1.310 +
1.311 + return superk;
1.312 +}
1.313 +
1.314 +// Update child's copy of super vtable for overrides
1.315 +// OR return true if a new vtable entry is required.
1.316 +// Only called for InstanceKlass's, i.e. not for arrays
1.317 +// If that changed, could not use _klass as handle for klass
1.318 +bool klassVtable::update_inherited_vtable(InstanceKlass* klass, methodHandle target_method,
1.319 + int super_vtable_len, int default_index,
1.320 + bool checkconstraints, TRAPS) {
1.321 + ResourceMark rm;
1.322 + bool allocate_new = true;
1.323 + assert(klass->oop_is_instance(), "must be InstanceKlass");
1.324 +
1.325 + Array<int>* def_vtable_indices = NULL;
1.326 + bool is_default = false;
1.327 + // default methods are concrete methods in superinterfaces which are added to the vtable
1.328 + // with their real method_holder
1.329 + // Since vtable and itable indices share the same storage, don't touch
1.330 + // the default method's real vtable/itable index
1.331 + // default_vtable_indices stores the vtable value relative to this inheritor
1.332 + if (default_index >= 0 ) {
1.333 + is_default = true;
1.334 + def_vtable_indices = klass->default_vtable_indices();
1.335 + assert(def_vtable_indices != NULL, "def vtable alloc?");
1.336 + assert(default_index <= def_vtable_indices->length(), "def vtable len?");
1.337 + } else {
1.338 + assert(klass == target_method()->method_holder(), "caller resp.");
1.339 + // Initialize the method's vtable index to "nonvirtual".
1.340 + // If we allocate a vtable entry, we will update it to a non-negative number.
1.341 + target_method()->set_vtable_index(Method::nonvirtual_vtable_index);
1.342 + }
1.343 +
1.344 + // Static and <init> methods are never in
1.345 + if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) {
1.346 + return false;
1.347 + }
1.348 +
1.349 + if (target_method->is_final_method(klass->access_flags())) {
1.350 + // a final method never needs a new entry; final methods can be statically
1.351 + // resolved and they have to be present in the vtable only if they override
1.352 + // a super's method, in which case they re-use its entry
1.353 + allocate_new = false;
1.354 + } else if (klass->is_interface()) {
1.355 + allocate_new = false; // see note below in needs_new_vtable_entry
1.356 + // An interface never allocates new vtable slots, only inherits old ones.
1.357 + // This method will either be assigned its own itable index later,
1.358 + // or be assigned an inherited vtable index in the loop below.
1.359 + // default methods inherited by classes store their vtable indices
1.360 + // in the inheritor's default_vtable_indices
1.361 + // default methods inherited by interfaces may already have a
1.362 + // valid itable index, if so, don't change it
1.363 + // overpass methods in an interface will be assigned an itable index later
1.364 + // by an inheriting class
1.365 + if (!is_default || !target_method()->has_itable_index()) {
1.366 + target_method()->set_vtable_index(Method::pending_itable_index);
1.367 + }
1.368 + }
1.369 +
1.370 + // we need a new entry if there is no superclass
1.371 + if (klass->super() == NULL) {
1.372 + return allocate_new;
1.373 + }
1.374 +
1.375 + // private methods in classes always have a new entry in the vtable
1.376 + // specification interpretation since classic has
1.377 + // private methods not overriding
1.378 + // JDK8 adds private methods in interfaces which require invokespecial
1.379 + if (target_method()->is_private()) {
1.380 + return allocate_new;
1.381 + }
1.382 +
1.383 + // search through the vtable and update overridden entries
1.384 + // Since check_signature_loaders acquires SystemDictionary_lock
1.385 + // which can block for gc, once we are in this loop, use handles
1.386 + // For classfiles built with >= jdk7, we now look for transitive overrides
1.387 +
1.388 + Symbol* name = target_method()->name();
1.389 + Symbol* signature = target_method()->signature();
1.390 +
1.391 + KlassHandle target_klass(THREAD, target_method()->method_holder());
1.392 + if (target_klass == NULL) {
1.393 + target_klass = _klass;
1.394 + }
1.395 +
1.396 + Handle target_loader(THREAD, target_klass->class_loader());
1.397 +
1.398 + Symbol* target_classname = target_klass->name();
1.399 + for(int i = 0; i < super_vtable_len; i++) {
1.400 + Method* super_method = method_at(i);
1.401 + // Check if method name matches
1.402 + if (super_method->name() == name && super_method->signature() == signature) {
1.403 +
1.404 + // get super_klass for method_holder for the found method
1.405 + InstanceKlass* super_klass = super_method->method_holder();
1.406 +
1.407 + if (is_default
1.408 + || ((super_klass->is_override(super_method, target_loader, target_classname, THREAD))
1.409 + || ((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION)
1.410 + && ((super_klass = find_transitive_override(super_klass,
1.411 + target_method, i, target_loader,
1.412 + target_classname, THREAD))
1.413 + != (InstanceKlass*)NULL))))
1.414 + {
1.415 + // Package private methods always need a new entry to root their own
1.416 + // overriding. They may also override other methods.
1.417 + if (!target_method()->is_package_private()) {
1.418 + allocate_new = false;
1.419 + }
1.420 +
1.421 + if (checkconstraints) {
1.422 + // Override vtable entry if passes loader constraint check
1.423 + // if loader constraint checking requested
1.424 + // No need to visit his super, since he and his super
1.425 + // have already made any needed loader constraints.
1.426 + // Since loader constraints are transitive, it is enough
1.427 + // to link to the first super, and we get all the others.
1.428 + Handle super_loader(THREAD, super_klass->class_loader());
1.429 +
1.430 + if (target_loader() != super_loader()) {
1.431 + ResourceMark rm(THREAD);
1.432 + Symbol* failed_type_symbol =
1.433 + SystemDictionary::check_signature_loaders(signature, target_loader,
1.434 + super_loader, true,
1.435 + CHECK_(false));
1.436 + if (failed_type_symbol != NULL) {
1.437 + const char* msg = "loader constraint violation: when resolving "
1.438 + "overridden method \"%s\" the class loader (instance"
1.439 + " of %s) of the current class, %s, and its superclass loader "
1.440 + "(instance of %s), have different Class objects for the type "
1.441 + "%s used in the signature";
1.442 + char* sig = target_method()->name_and_sig_as_C_string();
1.443 + const char* loader1 = SystemDictionary::loader_name(target_loader());
1.444 + char* current = target_klass->name()->as_C_string();
1.445 + const char* loader2 = SystemDictionary::loader_name(super_loader());
1.446 + char* failed_type_name = failed_type_symbol->as_C_string();
1.447 + size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
1.448 + strlen(current) + strlen(loader2) + strlen(failed_type_name);
1.449 + char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
1.450 + jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
1.451 + failed_type_name);
1.452 + THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false);
1.453 + }
1.454 + }
1.455 + }
1.456 +
1.457 + put_method_at(target_method(), i);
1.458 + if (!is_default) {
1.459 + target_method()->set_vtable_index(i);
1.460 + } else {
1.461 + if (def_vtable_indices != NULL) {
1.462 + def_vtable_indices->at_put(default_index, i);
1.463 + }
1.464 + assert(super_method->is_default_method() || super_method->is_overpass()
1.465 + || super_method->is_abstract(), "default override error");
1.466 + }
1.467 +
1.468 +
1.469 +#ifndef PRODUCT
1.470 + if (PrintVtables && Verbose) {
1.471 + ResourceMark rm(THREAD);
1.472 + char* sig = target_method()->name_and_sig_as_C_string();
1.473 + tty->print("overriding with %s::%s index %d, original flags: ",
1.474 + target_klass->internal_name(), sig, i);
1.475 + super_method->access_flags().print_on(tty);
1.476 + if (super_method->is_default_method()) {
1.477 + tty->print("default ");
1.478 + }
1.479 + if (super_method->is_overpass()) {
1.480 + tty->print("overpass");
1.481 + }
1.482 + tty->print("overriders flags: ");
1.483 + target_method->access_flags().print_on(tty);
1.484 + if (target_method->is_default_method()) {
1.485 + tty->print("default ");
1.486 + }
1.487 + if (target_method->is_overpass()) {
1.488 + tty->print("overpass");
1.489 + }
1.490 + tty->cr();
1.491 + }
1.492 +#endif /*PRODUCT*/
1.493 + } else {
1.494 + // allocate_new = true; default. We might override one entry,
1.495 + // but not override another. Once we override one, not need new
1.496 +#ifndef PRODUCT
1.497 + if (PrintVtables && Verbose) {
1.498 + ResourceMark rm(THREAD);
1.499 + char* sig = target_method()->name_and_sig_as_C_string();
1.500 + tty->print("NOT overriding with %s::%s index %d, original flags: ",
1.501 + target_klass->internal_name(), sig,i);
1.502 + super_method->access_flags().print_on(tty);
1.503 + if (super_method->is_default_method()) {
1.504 + tty->print("default ");
1.505 + }
1.506 + if (super_method->is_overpass()) {
1.507 + tty->print("overpass");
1.508 + }
1.509 + tty->print("overriders flags: ");
1.510 + target_method->access_flags().print_on(tty);
1.511 + if (target_method->is_default_method()) {
1.512 + tty->print("default ");
1.513 + }
1.514 + if (target_method->is_overpass()) {
1.515 + tty->print("overpass");
1.516 + }
1.517 + tty->cr();
1.518 + }
1.519 +#endif /*PRODUCT*/
1.520 + }
1.521 + }
1.522 + }
1.523 + return allocate_new;
1.524 +}
1.525 +
1.526 +void klassVtable::put_method_at(Method* m, int index) {
1.527 +#ifndef PRODUCT
1.528 + if (PrintVtables && Verbose) {
1.529 + ResourceMark rm;
1.530 + const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>";
1.531 + tty->print("adding %s at index %d, flags: ", sig, index);
1.532 + if (m != NULL) {
1.533 + m->access_flags().print_on(tty);
1.534 + if (m->is_default_method()) {
1.535 + tty->print("default ");
1.536 + }
1.537 + if (m->is_overpass()) {
1.538 + tty->print("overpass");
1.539 + }
1.540 + }
1.541 + tty->cr();
1.542 + }
1.543 +#endif
1.544 + table()[index].set(m);
1.545 +}
1.546 +
1.547 +// Find out if a method "m" with superclass "super", loader "classloader" and
1.548 +// name "classname" needs a new vtable entry. Let P be a class package defined
1.549 +// by "classloader" and "classname".
1.550 +// NOTE: The logic used here is very similar to the one used for computing
1.551 +// the vtables indices for a method. We cannot directly use that function because,
1.552 +// we allocate the InstanceKlass at load time, and that requires that the
1.553 +// superclass has been loaded.
1.554 +// However, the vtable entries are filled in at link time, and therefore
1.555 +// the superclass' vtable may not yet have been filled in.
1.556 +bool klassVtable::needs_new_vtable_entry(methodHandle target_method,
1.557 + Klass* super,
1.558 + Handle classloader,
1.559 + Symbol* classname,
1.560 + AccessFlags class_flags,
1.561 + TRAPS) {
1.562 + if (class_flags.is_interface()) {
1.563 + // Interfaces do not use vtables, except for java.lang.Object methods,
1.564 + // so there is no point to assigning
1.565 + // a vtable index to any of their local methods. If we refrain from doing this,
1.566 + // we can use Method::_vtable_index to hold the itable index
1.567 + return false;
1.568 + }
1.569 +
1.570 + if (target_method->is_final_method(class_flags) ||
1.571 + // a final method never needs a new entry; final methods can be statically
1.572 + // resolved and they have to be present in the vtable only if they override
1.573 + // a super's method, in which case they re-use its entry
1.574 + (target_method()->is_static()) ||
1.575 + // static methods don't need to be in vtable
1.576 + (target_method()->name() == vmSymbols::object_initializer_name())
1.577 + // <init> is never called dynamically-bound
1.578 + ) {
1.579 + return false;
1.580 + }
1.581 +
1.582 + // Concrete interface methods do not need new entries, they override
1.583 + // abstract method entries using default inheritance rules
1.584 + if (target_method()->method_holder() != NULL &&
1.585 + target_method()->method_holder()->is_interface() &&
1.586 + !target_method()->is_abstract() ) {
1.587 + return false;
1.588 + }
1.589 +
1.590 + // we need a new entry if there is no superclass
1.591 + if (super == NULL) {
1.592 + return true;
1.593 + }
1.594 +
1.595 + // private methods in classes always have a new entry in the vtable
1.596 + // specification interpretation since classic has
1.597 + // private methods not overriding
1.598 + // JDK8 adds private methods in interfaces which require invokespecial
1.599 + if (target_method()->is_private()) {
1.600 + return true;
1.601 + }
1.602 +
1.603 + // Package private methods always need a new entry to root their own
1.604 + // overriding. This allows transitive overriding to work.
1.605 + if (target_method()->is_package_private()) {
1.606 + return true;
1.607 + }
1.608 +
1.609 + // search through the super class hierarchy to see if we need
1.610 + // a new entry
1.611 + ResourceMark rm;
1.612 + Symbol* name = target_method()->name();
1.613 + Symbol* signature = target_method()->signature();
1.614 + Klass* k = super;
1.615 + Method* super_method = NULL;
1.616 + InstanceKlass *holder = NULL;
1.617 + Method* recheck_method = NULL;
1.618 + while (k != NULL) {
1.619 + // lookup through the hierarchy for a method with matching name and sign.
1.620 + super_method = InstanceKlass::cast(k)->lookup_method(name, signature);
1.621 + if (super_method == NULL) {
1.622 + break; // we still have to search for a matching miranda method
1.623 + }
1.624 + // get the class holding the matching method
1.625 + // make sure you use that class for is_override
1.626 + InstanceKlass* superk = super_method->method_holder();
1.627 + // we want only instance method matches
1.628 + // pretend private methods are not in the super vtable
1.629 + // since we do override around them: e.g. a.m pub/b.m private/c.m pub,
1.630 + // ignore private, c.m pub does override a.m pub
1.631 + // For classes that were not javac'd together, we also do transitive overriding around
1.632 + // methods that have less accessibility
1.633 + if ((!super_method->is_static()) &&
1.634 + (!super_method->is_private())) {
1.635 + if (superk->is_override(super_method, classloader, classname, THREAD)) {
1.636 + return false;
1.637 + // else keep looking for transitive overrides
1.638 + }
1.639 + }
1.640 +
1.641 + // Start with lookup result and continue to search up
1.642 + k = superk->super(); // haven't found an override match yet; continue to look
1.643 + }
1.644 +
1.645 + // if the target method is public or protected it may have a matching
1.646 + // miranda method in the super, whose entry it should re-use.
1.647 + // Actually, to handle cases that javac would not generate, we need
1.648 + // this check for all access permissions.
1.649 + InstanceKlass *sk = InstanceKlass::cast(super);
1.650 + if (sk->has_miranda_methods()) {
1.651 + if (sk->lookup_method_in_all_interfaces(name, signature, Klass::normal) != NULL) {
1.652 + return false; // found a matching miranda; we do not need a new entry
1.653 + }
1.654 + }
1.655 + return true; // found no match; we need a new entry
1.656 +}
1.657 +
1.658 +// Support for miranda methods
1.659 +
1.660 +// get the vtable index of a miranda method with matching "name" and "signature"
1.661 +int klassVtable::index_of_miranda(Symbol* name, Symbol* signature) {
1.662 + // search from the bottom, might be faster
1.663 + for (int i = (length() - 1); i >= 0; i--) {
1.664 + Method* m = table()[i].method();
1.665 + if (is_miranda_entry_at(i) &&
1.666 + m->name() == name && m->signature() == signature) {
1.667 + return i;
1.668 + }
1.669 + }
1.670 + return Method::invalid_vtable_index;
1.671 +}
1.672 +
1.673 +// check if an entry at an index is miranda
1.674 +// requires that method m at entry be declared ("held") by an interface.
1.675 +bool klassVtable::is_miranda_entry_at(int i) {
1.676 + Method* m = method_at(i);
1.677 + Klass* method_holder = m->method_holder();
1.678 + InstanceKlass *mhk = InstanceKlass::cast(method_holder);
1.679 +
1.680 + // miranda methods are public abstract instance interface methods in a class's vtable
1.681 + if (mhk->is_interface()) {
1.682 + assert(m->is_public(), "should be public");
1.683 + assert(ik()->implements_interface(method_holder) , "this class should implement the interface");
1.684 + // the search could find a miranda or a default method
1.685 + if (is_miranda(m, ik()->methods(), ik()->default_methods(), ik()->super())) {
1.686 + return true;
1.687 + }
1.688 + }
1.689 + return false;
1.690 +}
1.691 +
1.692 +// check if a method is a miranda method, given a class's methods table,
1.693 +// its default_method table and its super
1.694 +// Miranda methods are calculated twice:
1.695 +// first: before vtable size calculation: including abstract and default
1.696 +// This is seen by default method creation
1.697 +// Second: recalculated during vtable initialization: only abstract
1.698 +// This is seen by link resolution and selection.
1.699 +// "miranda" means not static, not defined by this class.
1.700 +// private methods in interfaces do not belong in the miranda list.
1.701 +// the caller must make sure that the method belongs to an interface implemented by the class
1.702 +// Miranda methods only include public interface instance methods
1.703 +// Not private methods, not static methods, not default == concrete abstract
1.704 +// Miranda methods also do not include overpass methods in interfaces
1.705 +bool klassVtable::is_miranda(Method* m, Array<Method*>* class_methods,
1.706 + Array<Method*>* default_methods, Klass* super) {
1.707 + if (m->is_static() || m->is_private() || m->is_overpass()) {
1.708 + return false;
1.709 + }
1.710 + Symbol* name = m->name();
1.711 + Symbol* signature = m->signature();
1.712 +
1.713 + if (InstanceKlass::find_instance_method(class_methods, name, signature) == NULL) {
1.714 + // did not find it in the method table of the current class
1.715 + if ((default_methods == NULL) ||
1.716 + InstanceKlass::find_method(default_methods, name, signature) == NULL) {
1.717 + if (super == NULL) {
1.718 + // super doesn't exist
1.719 + return true;
1.720 + }
1.721 +
1.722 + Method* mo = InstanceKlass::cast(super)->lookup_method(name, signature);
1.723 + while (mo != NULL && mo->access_flags().is_static()
1.724 + && mo->method_holder() != NULL
1.725 + && mo->method_holder()->super() != NULL)
1.726 + {
1.727 + mo = mo->method_holder()->super()->uncached_lookup_method(name, signature, Klass::normal);
1.728 + }
1.729 + if (mo == NULL || mo->access_flags().is_private() ) {
1.730 + // super class hierarchy does not implement it or protection is different
1.731 + return true;
1.732 + }
1.733 + }
1.734 + }
1.735 +
1.736 + return false;
1.737 +}
1.738 +
1.739 +// Scans current_interface_methods for miranda methods that do not
1.740 +// already appear in new_mirandas, or default methods, and are also not defined-and-non-private
1.741 +// in super (superclass). These mirandas are added to all_mirandas if it is
1.742 +// not null; in addition, those that are not duplicates of miranda methods
1.743 +// inherited by super from its interfaces are added to new_mirandas.
1.744 +// Thus, new_mirandas will be the set of mirandas that this class introduces,
1.745 +// all_mirandas will be the set of all mirandas applicable to this class
1.746 +// including all defined in superclasses.
1.747 +void klassVtable::add_new_mirandas_to_lists(
1.748 + GrowableArray<Method*>* new_mirandas, GrowableArray<Method*>* all_mirandas,
1.749 + Array<Method*>* current_interface_methods, Array<Method*>* class_methods,
1.750 + Array<Method*>* default_methods, Klass* super) {
1.751 +
1.752 + // iterate thru the current interface's method to see if it a miranda
1.753 + int num_methods = current_interface_methods->length();
1.754 + for (int i = 0; i < num_methods; i++) {
1.755 + Method* im = current_interface_methods->at(i);
1.756 + bool is_duplicate = false;
1.757 + int num_of_current_mirandas = new_mirandas->length();
1.758 + // check for duplicate mirandas in different interfaces we implement
1.759 + for (int j = 0; j < num_of_current_mirandas; j++) {
1.760 + Method* miranda = new_mirandas->at(j);
1.761 + if ((im->name() == miranda->name()) &&
1.762 + (im->signature() == miranda->signature())) {
1.763 + is_duplicate = true;
1.764 + break;
1.765 + }
1.766 + }
1.767 +
1.768 + if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable
1.769 + if (is_miranda(im, class_methods, default_methods, super)) { // is it a miranda at all?
1.770 + InstanceKlass *sk = InstanceKlass::cast(super);
1.771 + // check if it is a duplicate of a super's miranda
1.772 + if (sk->lookup_method_in_all_interfaces(im->name(), im->signature(), Klass::normal) == NULL) {
1.773 + new_mirandas->append(im);
1.774 + }
1.775 + if (all_mirandas != NULL) {
1.776 + all_mirandas->append(im);
1.777 + }
1.778 + }
1.779 + }
1.780 + }
1.781 +}
1.782 +
1.783 +void klassVtable::get_mirandas(GrowableArray<Method*>* new_mirandas,
1.784 + GrowableArray<Method*>* all_mirandas,
1.785 + Klass* super, Array<Method*>* class_methods,
1.786 + Array<Method*>* default_methods,
1.787 + Array<Klass*>* local_interfaces) {
1.788 + assert((new_mirandas->length() == 0) , "current mirandas must be 0");
1.789 +
1.790 + // iterate thru the local interfaces looking for a miranda
1.791 + int num_local_ifs = local_interfaces->length();
1.792 + for (int i = 0; i < num_local_ifs; i++) {
1.793 + InstanceKlass *ik = InstanceKlass::cast(local_interfaces->at(i));
1.794 + add_new_mirandas_to_lists(new_mirandas, all_mirandas,
1.795 + ik->methods(), class_methods,
1.796 + default_methods, super);
1.797 + // iterate thru each local's super interfaces
1.798 + Array<Klass*>* super_ifs = ik->transitive_interfaces();
1.799 + int num_super_ifs = super_ifs->length();
1.800 + for (int j = 0; j < num_super_ifs; j++) {
1.801 + InstanceKlass *sik = InstanceKlass::cast(super_ifs->at(j));
1.802 + add_new_mirandas_to_lists(new_mirandas, all_mirandas,
1.803 + sik->methods(), class_methods,
1.804 + default_methods, super);
1.805 + }
1.806 + }
1.807 +}
1.808 +
1.809 +// Discover miranda methods ("miranda" = "interface abstract, no binding"),
1.810 +// and append them into the vtable starting at index initialized,
1.811 +// return the new value of initialized.
1.812 +// Miranda methods use vtable entries, but do not get assigned a vtable_index
1.813 +// The vtable_index is discovered by searching from the end of the vtable
1.814 +int klassVtable::fill_in_mirandas(int initialized) {
1.815 + GrowableArray<Method*> mirandas(20);
1.816 + get_mirandas(&mirandas, NULL, ik()->super(), ik()->methods(),
1.817 + ik()->default_methods(), ik()->local_interfaces());
1.818 + for (int i = 0; i < mirandas.length(); i++) {
1.819 + if (PrintVtables && Verbose) {
1.820 + Method* meth = mirandas.at(i);
1.821 + ResourceMark rm(Thread::current());
1.822 + if (meth != NULL) {
1.823 + char* sig = meth->name_and_sig_as_C_string();
1.824 + tty->print("fill in mirandas with %s index %d, flags: ",
1.825 + sig, initialized);
1.826 + meth->access_flags().print_on(tty);
1.827 + if (meth->is_default_method()) {
1.828 + tty->print("default ");
1.829 + }
1.830 + tty->cr();
1.831 + }
1.832 + }
1.833 + put_method_at(mirandas.at(i), initialized);
1.834 + ++initialized;
1.835 + }
1.836 + return initialized;
1.837 +}
1.838 +
1.839 +// Copy this class's vtable to the vtable beginning at start.
1.840 +// Used to copy superclass vtable to prefix of subclass's vtable.
1.841 +void klassVtable::copy_vtable_to(vtableEntry* start) {
1.842 + Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size());
1.843 +}
1.844 +
1.845 +#if INCLUDE_JVMTI
1.846 +bool klassVtable::adjust_default_method(int vtable_index, Method* old_method, Method* new_method) {
1.847 + // If old_method is default, find this vtable index in default_vtable_indices
1.848 + // and replace that method in the _default_methods list
1.849 + bool updated = false;
1.850 +
1.851 + Array<Method*>* default_methods = ik()->default_methods();
1.852 + if (default_methods != NULL) {
1.853 + int len = default_methods->length();
1.854 + for (int idx = 0; idx < len; idx++) {
1.855 + if (vtable_index == ik()->default_vtable_indices()->at(idx)) {
1.856 + if (default_methods->at(idx) == old_method) {
1.857 + default_methods->at_put(idx, new_method);
1.858 + updated = true;
1.859 + }
1.860 + break;
1.861 + }
1.862 + }
1.863 + }
1.864 + return updated;
1.865 +}
1.866 +void klassVtable::adjust_method_entries(Method** old_methods, Method** new_methods,
1.867 + int methods_length, bool * trace_name_printed) {
1.868 + // search the vtable for uses of either obsolete or EMCP methods
1.869 + for (int j = 0; j < methods_length; j++) {
1.870 + Method* old_method = old_methods[j];
1.871 + Method* new_method = new_methods[j];
1.872 +
1.873 + // In the vast majority of cases we could get the vtable index
1.874 + // by using: old_method->vtable_index()
1.875 + // However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX()
1.876 + // in sun.awt.X11.XFramePeer where methods occur more than once in the
1.877 + // vtable, so, alas, we must do an exhaustive search.
1.878 + for (int index = 0; index < length(); index++) {
1.879 + if (unchecked_method_at(index) == old_method) {
1.880 + put_method_at(new_method, index);
1.881 + // For default methods, need to update the _default_methods array
1.882 + // which can only have one method entry for a given signature
1.883 + bool updated_default = false;
1.884 + if (old_method->is_default_method()) {
1.885 + updated_default = adjust_default_method(index, old_method, new_method);
1.886 + }
1.887 +
1.888 + if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1.889 + if (!(*trace_name_printed)) {
1.890 + // RC_TRACE_MESG macro has an embedded ResourceMark
1.891 + RC_TRACE_MESG(("adjust: klassname=%s for methods from name=%s",
1.892 + klass()->external_name(),
1.893 + old_method->method_holder()->external_name()));
1.894 + *trace_name_printed = true;
1.895 + }
1.896 + // RC_TRACE macro has an embedded ResourceMark
1.897 + RC_TRACE(0x00100000, ("vtable method update: %s(%s), updated default = %s",
1.898 + new_method->name()->as_C_string(),
1.899 + new_method->signature()->as_C_string(),
1.900 + updated_default ? "true" : "false"));
1.901 + }
1.902 + // cannot 'break' here; see for-loop comment above.
1.903 + }
1.904 + }
1.905 + }
1.906 +}
1.907 +
1.908 +// a vtable should never contain old or obsolete methods
1.909 +bool klassVtable::check_no_old_or_obsolete_entries() {
1.910 + for (int i = 0; i < length(); i++) {
1.911 + Method* m = unchecked_method_at(i);
1.912 + if (m != NULL &&
1.913 + (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) {
1.914 + return false;
1.915 + }
1.916 + }
1.917 + return true;
1.918 +}
1.919 +
1.920 +void klassVtable::dump_vtable() {
1.921 + tty->print_cr("vtable dump --");
1.922 + for (int i = 0; i < length(); i++) {
1.923 + Method* m = unchecked_method_at(i);
1.924 + if (m != NULL) {
1.925 + tty->print(" (%5d) ", i);
1.926 + m->access_flags().print_on(tty);
1.927 + if (m->is_default_method()) {
1.928 + tty->print("default ");
1.929 + }
1.930 + if (m->is_overpass()) {
1.931 + tty->print("overpass");
1.932 + }
1.933 + tty->print(" -- ");
1.934 + m->print_name(tty);
1.935 + tty->cr();
1.936 + }
1.937 + }
1.938 +}
1.939 +#endif // INCLUDE_JVMTI
1.940 +
1.941 +// CDS/RedefineClasses support - clear vtables so they can be reinitialized
1.942 +void klassVtable::clear_vtable() {
1.943 + for (int i = 0; i < _length; i++) table()[i].clear();
1.944 +}
1.945 +
1.946 +bool klassVtable::is_initialized() {
1.947 + return _length == 0 || table()[0].method() != NULL;
1.948 +}
1.949 +
1.950 +//-----------------------------------------------------------------------------------------
1.951 +// Itable code
1.952 +
1.953 +// Initialize a itableMethodEntry
1.954 +void itableMethodEntry::initialize(Method* m) {
1.955 + if (m == NULL) return;
1.956 +
1.957 + _method = m;
1.958 +}
1.959 +
1.960 +klassItable::klassItable(instanceKlassHandle klass) {
1.961 + _klass = klass;
1.962 +
1.963 + if (klass->itable_length() > 0) {
1.964 + itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable();
1.965 + if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized
1.966 + // First offset entry points to the first method_entry
1.967 + intptr_t* method_entry = (intptr_t *)(((address)klass()) + offset_entry->offset());
1.968 + intptr_t* end = klass->end_of_itable();
1.969 +
1.970 + _table_offset = (intptr_t*)offset_entry - (intptr_t*)klass();
1.971 + _size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size();
1.972 + _size_method_table = (end - method_entry) / itableMethodEntry::size();
1.973 + assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation");
1.974 + return;
1.975 + }
1.976 + }
1.977 +
1.978 + // The length of the itable was either zero, or it has not yet been initialized.
1.979 + _table_offset = 0;
1.980 + _size_offset_table = 0;
1.981 + _size_method_table = 0;
1.982 +}
1.983 +
1.984 +static int initialize_count = 0;
1.985 +
1.986 +// Initialization
1.987 +void klassItable::initialize_itable(bool checkconstraints, TRAPS) {
1.988 + if (_klass->is_interface()) {
1.989 + // This needs to go after vtable indices are assigned but
1.990 + // before implementors need to know the number of itable indices.
1.991 + assign_itable_indices_for_interface(_klass());
1.992 + }
1.993 +
1.994 + // Cannot be setup doing bootstrapping, interfaces don't have
1.995 + // itables, and klass with only ones entry have empty itables
1.996 + if (Universe::is_bootstrapping() ||
1.997 + _klass->is_interface() ||
1.998 + _klass->itable_length() == itableOffsetEntry::size()) return;
1.999 +
1.1000 + // There's alway an extra itable entry so we can null-terminate it.
1.1001 + guarantee(size_offset_table() >= 1, "too small");
1.1002 + int num_interfaces = size_offset_table() - 1;
1.1003 + if (num_interfaces > 0) {
1.1004 + if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count,
1.1005 + _klass->name()->as_C_string());
1.1006 +
1.1007 +
1.1008 + // Iterate through all interfaces
1.1009 + int i;
1.1010 + for(i = 0; i < num_interfaces; i++) {
1.1011 + itableOffsetEntry* ioe = offset_entry(i);
1.1012 + HandleMark hm(THREAD);
1.1013 + KlassHandle interf_h (THREAD, ioe->interface_klass());
1.1014 + assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable");
1.1015 + initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK);
1.1016 + }
1.1017 +
1.1018 + }
1.1019 + // Check that the last entry is empty
1.1020 + itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1);
1.1021 + guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing");
1.1022 +}
1.1023 +
1.1024 +
1.1025 +inline bool interface_method_needs_itable_index(Method* m) {
1.1026 + if (m->is_static()) return false; // e.g., Stream.empty
1.1027 + if (m->is_initializer()) return false; // <init> or <clinit>
1.1028 + // If an interface redeclares a method from java.lang.Object,
1.1029 + // it should already have a vtable index, don't touch it.
1.1030 + // e.g., CharSequence.toString (from initialize_vtable)
1.1031 + // if (m->has_vtable_index()) return false; // NO!
1.1032 + return true;
1.1033 +}
1.1034 +
1.1035 +int klassItable::assign_itable_indices_for_interface(Klass* klass) {
1.1036 + // an interface does not have an itable, but its methods need to be numbered
1.1037 + if (TraceItables) tty->print_cr("%3d: Initializing itable for interface %s", ++initialize_count,
1.1038 + klass->name()->as_C_string());
1.1039 + Array<Method*>* methods = InstanceKlass::cast(klass)->methods();
1.1040 + int nof_methods = methods->length();
1.1041 + int ime_num = 0;
1.1042 + for (int i = 0; i < nof_methods; i++) {
1.1043 + Method* m = methods->at(i);
1.1044 + if (interface_method_needs_itable_index(m)) {
1.1045 + assert(!m->is_final_method(), "no final interface methods");
1.1046 + // If m is already assigned a vtable index, do not disturb it.
1.1047 + if (TraceItables && Verbose) {
1.1048 + ResourceMark rm;
1.1049 + const char* sig = (m != NULL) ? m->name_and_sig_as_C_string() : "<NULL>";
1.1050 + if (m->has_vtable_index()) {
1.1051 + tty->print("itable index %d for method: %s, flags: ", m->vtable_index(), sig);
1.1052 + } else {
1.1053 + tty->print("itable index %d for method: %s, flags: ", ime_num, sig);
1.1054 + }
1.1055 + if (m != NULL) {
1.1056 + m->access_flags().print_on(tty);
1.1057 + if (m->is_default_method()) {
1.1058 + tty->print("default ");
1.1059 + }
1.1060 + if (m->is_overpass()) {
1.1061 + tty->print("overpass");
1.1062 + }
1.1063 + }
1.1064 + tty->cr();
1.1065 + }
1.1066 + if (!m->has_vtable_index()) {
1.1067 + assert(m->vtable_index() == Method::pending_itable_index, "set by initialize_vtable");
1.1068 + m->set_itable_index(ime_num);
1.1069 + // Progress to next itable entry
1.1070 + ime_num++;
1.1071 + }
1.1072 + }
1.1073 + }
1.1074 + assert(ime_num == method_count_for_interface(klass), "proper sizing");
1.1075 + return ime_num;
1.1076 +}
1.1077 +
1.1078 +int klassItable::method_count_for_interface(Klass* interf) {
1.1079 + assert(interf->oop_is_instance(), "must be");
1.1080 + assert(interf->is_interface(), "must be");
1.1081 + Array<Method*>* methods = InstanceKlass::cast(interf)->methods();
1.1082 + int nof_methods = methods->length();
1.1083 + while (nof_methods > 0) {
1.1084 + Method* m = methods->at(nof_methods-1);
1.1085 + if (m->has_itable_index()) {
1.1086 + int length = m->itable_index() + 1;
1.1087 +#ifdef ASSERT
1.1088 + while (nof_methods = 0) {
1.1089 + m = methods->at(--nof_methods);
1.1090 + assert(!m->has_itable_index() || m->itable_index() < length, "");
1.1091 + }
1.1092 +#endif //ASSERT
1.1093 + return length; // return the rightmost itable index, plus one
1.1094 + }
1.1095 + nof_methods -= 1;
1.1096 + }
1.1097 + // no methods have itable indices
1.1098 + return 0;
1.1099 +}
1.1100 +
1.1101 +
1.1102 +void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) {
1.1103 + Array<Method*>* methods = InstanceKlass::cast(interf_h())->methods();
1.1104 + int nof_methods = methods->length();
1.1105 + HandleMark hm;
1.1106 + assert(nof_methods > 0, "at least one method must exist for interface to be in vtable");
1.1107 + Handle interface_loader (THREAD, InstanceKlass::cast(interf_h())->class_loader());
1.1108 +
1.1109 + int ime_count = method_count_for_interface(interf_h());
1.1110 + for (int i = 0; i < nof_methods; i++) {
1.1111 + Method* m = methods->at(i);
1.1112 + methodHandle target;
1.1113 + if (m->has_itable_index()) {
1.1114 + // This search must match the runtime resolution, i.e. selection search for invokeinterface
1.1115 + // to correctly enforce loader constraints for interface method inheritance
1.1116 + LinkResolver::lookup_instance_method_in_klasses(target, _klass, m->name(), m->signature(), CHECK);
1.1117 + }
1.1118 + if (target == NULL || !target->is_public() || target->is_abstract()) {
1.1119 + // Entry does not resolve. Leave it empty for AbstractMethodError.
1.1120 + if (!(target == NULL) && !target->is_public()) {
1.1121 + // Stuff an IllegalAccessError throwing method in there instead.
1.1122 + itableOffsetEntry::method_entry(_klass(), method_table_offset)[m->itable_index()].
1.1123 + initialize(Universe::throw_illegal_access_error());
1.1124 + }
1.1125 + } else {
1.1126 + // Entry did resolve, check loader constraints before initializing
1.1127 + // if checkconstraints requested
1.1128 + if (checkconstraints) {
1.1129 + Handle method_holder_loader (THREAD, target->method_holder()->class_loader());
1.1130 + if (method_holder_loader() != interface_loader()) {
1.1131 + ResourceMark rm(THREAD);
1.1132 + Symbol* failed_type_symbol =
1.1133 + SystemDictionary::check_signature_loaders(m->signature(),
1.1134 + method_holder_loader,
1.1135 + interface_loader,
1.1136 + true, CHECK);
1.1137 + if (failed_type_symbol != NULL) {
1.1138 + const char* msg = "loader constraint violation in interface "
1.1139 + "itable initialization: when resolving method \"%s\" the class"
1.1140 + " loader (instance of %s) of the current class, %s, "
1.1141 + "and the class loader (instance of %s) for interface "
1.1142 + "%s have different Class objects for the type %s "
1.1143 + "used in the signature";
1.1144 + char* sig = target()->name_and_sig_as_C_string();
1.1145 + const char* loader1 = SystemDictionary::loader_name(method_holder_loader());
1.1146 + char* current = _klass->name()->as_C_string();
1.1147 + const char* loader2 = SystemDictionary::loader_name(interface_loader());
1.1148 + char* iface = InstanceKlass::cast(interf_h())->name()->as_C_string();
1.1149 + char* failed_type_name = failed_type_symbol->as_C_string();
1.1150 + size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
1.1151 + strlen(current) + strlen(loader2) + strlen(iface) +
1.1152 + strlen(failed_type_name);
1.1153 + char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
1.1154 + jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
1.1155 + iface, failed_type_name);
1.1156 + THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
1.1157 + }
1.1158 + }
1.1159 + }
1.1160 +
1.1161 + // ime may have moved during GC so recalculate address
1.1162 + int ime_num = m->itable_index();
1.1163 + assert(ime_num < ime_count, "oob");
1.1164 + itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target());
1.1165 + if (TraceItables && Verbose) {
1.1166 + ResourceMark rm(THREAD);
1.1167 + if (target() != NULL) {
1.1168 + char* sig = target()->name_and_sig_as_C_string();
1.1169 + tty->print("interface: %s, ime_num: %d, target: %s, method_holder: %s ",
1.1170 + interf_h()->internal_name(), ime_num, sig,
1.1171 + target()->method_holder()->internal_name());
1.1172 + tty->print("target_method flags: ");
1.1173 + target()->access_flags().print_on(tty);
1.1174 + if (target()->is_default_method()) {
1.1175 + tty->print("default ");
1.1176 + }
1.1177 + tty->cr();
1.1178 + }
1.1179 + }
1.1180 + }
1.1181 + }
1.1182 +}
1.1183 +
1.1184 +// Update entry for specific Method*
1.1185 +void klassItable::initialize_with_method(Method* m) {
1.1186 + itableMethodEntry* ime = method_entry(0);
1.1187 + for(int i = 0; i < _size_method_table; i++) {
1.1188 + if (ime->method() == m) {
1.1189 + ime->initialize(m);
1.1190 + }
1.1191 + ime++;
1.1192 + }
1.1193 +}
1.1194 +
1.1195 +#if INCLUDE_JVMTI
1.1196 +void klassItable::adjust_method_entries(Method** old_methods, Method** new_methods,
1.1197 + int methods_length, bool * trace_name_printed) {
1.1198 + // search the itable for uses of either obsolete or EMCP methods
1.1199 + for (int j = 0; j < methods_length; j++) {
1.1200 + Method* old_method = old_methods[j];
1.1201 + Method* new_method = new_methods[j];
1.1202 + itableMethodEntry* ime = method_entry(0);
1.1203 +
1.1204 + // The itable can describe more than one interface and the same
1.1205 + // method signature can be specified by more than one interface.
1.1206 + // This means we have to do an exhaustive search to find all the
1.1207 + // old_method references.
1.1208 + for (int i = 0; i < _size_method_table; i++) {
1.1209 + if (ime->method() == old_method) {
1.1210 + ime->initialize(new_method);
1.1211 +
1.1212 + if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
1.1213 + if (!(*trace_name_printed)) {
1.1214 + // RC_TRACE_MESG macro has an embedded ResourceMark
1.1215 + RC_TRACE_MESG(("adjust: name=%s",
1.1216 + old_method->method_holder()->external_name()));
1.1217 + *trace_name_printed = true;
1.1218 + }
1.1219 + // RC_TRACE macro has an embedded ResourceMark
1.1220 + RC_TRACE(0x00200000, ("itable method update: %s(%s)",
1.1221 + new_method->name()->as_C_string(),
1.1222 + new_method->signature()->as_C_string()));
1.1223 + }
1.1224 + // cannot 'break' here; see for-loop comment above.
1.1225 + }
1.1226 + ime++;
1.1227 + }
1.1228 + }
1.1229 +}
1.1230 +
1.1231 +// an itable should never contain old or obsolete methods
1.1232 +bool klassItable::check_no_old_or_obsolete_entries() {
1.1233 + itableMethodEntry* ime = method_entry(0);
1.1234 + for (int i = 0; i < _size_method_table; i++) {
1.1235 + Method* m = ime->method();
1.1236 + if (m != NULL &&
1.1237 + (NOT_PRODUCT(!m->is_valid() ||) m->is_old() || m->is_obsolete())) {
1.1238 + return false;
1.1239 + }
1.1240 + ime++;
1.1241 + }
1.1242 + return true;
1.1243 +}
1.1244 +
1.1245 +void klassItable::dump_itable() {
1.1246 + itableMethodEntry* ime = method_entry(0);
1.1247 + tty->print_cr("itable dump --");
1.1248 + for (int i = 0; i < _size_method_table; i++) {
1.1249 + Method* m = ime->method();
1.1250 + if (m != NULL) {
1.1251 + tty->print(" (%5d) ", i);
1.1252 + m->access_flags().print_on(tty);
1.1253 + if (m->is_default_method()) {
1.1254 + tty->print("default ");
1.1255 + }
1.1256 + tty->print(" -- ");
1.1257 + m->print_name(tty);
1.1258 + tty->cr();
1.1259 + }
1.1260 + ime++;
1.1261 + }
1.1262 +}
1.1263 +#endif // INCLUDE_JVMTI
1.1264 +
1.1265 +
1.1266 +// Setup
1.1267 +class InterfaceVisiterClosure : public StackObj {
1.1268 + public:
1.1269 + virtual void doit(Klass* intf, int method_count) = 0;
1.1270 +};
1.1271 +
1.1272 +// Visit all interfaces with at least one itable method
1.1273 +void visit_all_interfaces(Array<Klass*>* transitive_intf, InterfaceVisiterClosure *blk) {
1.1274 + // Handle array argument
1.1275 + for(int i = 0; i < transitive_intf->length(); i++) {
1.1276 + Klass* intf = transitive_intf->at(i);
1.1277 + assert(intf->is_interface(), "sanity check");
1.1278 +
1.1279 + // Find no. of itable methods
1.1280 + int method_count = 0;
1.1281 + // method_count = klassItable::method_count_for_interface(intf);
1.1282 + Array<Method*>* methods = InstanceKlass::cast(intf)->methods();
1.1283 + if (methods->length() > 0) {
1.1284 + for (int i = methods->length(); --i >= 0; ) {
1.1285 + if (interface_method_needs_itable_index(methods->at(i))) {
1.1286 + method_count++;
1.1287 + }
1.1288 + }
1.1289 + }
1.1290 +
1.1291 + // Only count interfaces with at least one method
1.1292 + if (method_count > 0) {
1.1293 + blk->doit(intf, method_count);
1.1294 + }
1.1295 + }
1.1296 +}
1.1297 +
1.1298 +class CountInterfacesClosure : public InterfaceVisiterClosure {
1.1299 + private:
1.1300 + int _nof_methods;
1.1301 + int _nof_interfaces;
1.1302 + public:
1.1303 + CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; }
1.1304 +
1.1305 + int nof_methods() const { return _nof_methods; }
1.1306 + int nof_interfaces() const { return _nof_interfaces; }
1.1307 +
1.1308 + void doit(Klass* intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; }
1.1309 +};
1.1310 +
1.1311 +class SetupItableClosure : public InterfaceVisiterClosure {
1.1312 + private:
1.1313 + itableOffsetEntry* _offset_entry;
1.1314 + itableMethodEntry* _method_entry;
1.1315 + address _klass_begin;
1.1316 + public:
1.1317 + SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) {
1.1318 + _klass_begin = klass_begin;
1.1319 + _offset_entry = offset_entry;
1.1320 + _method_entry = method_entry;
1.1321 + }
1.1322 +
1.1323 + itableMethodEntry* method_entry() const { return _method_entry; }
1.1324 +
1.1325 + void doit(Klass* intf, int method_count) {
1.1326 + int offset = ((address)_method_entry) - _klass_begin;
1.1327 + _offset_entry->initialize(intf, offset);
1.1328 + _offset_entry++;
1.1329 + _method_entry += method_count;
1.1330 + }
1.1331 +};
1.1332 +
1.1333 +int klassItable::compute_itable_size(Array<Klass*>* transitive_interfaces) {
1.1334 + // Count no of interfaces and total number of interface methods
1.1335 + CountInterfacesClosure cic;
1.1336 + visit_all_interfaces(transitive_interfaces, &cic);
1.1337 +
1.1338 + // There's alway an extra itable entry so we can null-terminate it.
1.1339 + int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods());
1.1340 +
1.1341 + // Statistics
1.1342 + update_stats(itable_size * HeapWordSize);
1.1343 +
1.1344 + return itable_size;
1.1345 +}
1.1346 +
1.1347 +
1.1348 +// Fill out offset table and interface klasses into the itable space
1.1349 +void klassItable::setup_itable_offset_table(instanceKlassHandle klass) {
1.1350 + if (klass->itable_length() == 0) return;
1.1351 + assert(!klass->is_interface(), "Should have zero length itable");
1.1352 +
1.1353 + // Count no of interfaces and total number of interface methods
1.1354 + CountInterfacesClosure cic;
1.1355 + visit_all_interfaces(klass->transitive_interfaces(), &cic);
1.1356 + int nof_methods = cic.nof_methods();
1.1357 + int nof_interfaces = cic.nof_interfaces();
1.1358 +
1.1359 + // Add one extra entry so we can null-terminate the table
1.1360 + nof_interfaces++;
1.1361 +
1.1362 + assert(compute_itable_size(klass->transitive_interfaces()) ==
1.1363 + calc_itable_size(nof_interfaces, nof_methods),
1.1364 + "mismatch calculation of itable size");
1.1365 +
1.1366 + // Fill-out offset table
1.1367 + itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable();
1.1368 + itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces);
1.1369 + intptr_t* end = klass->end_of_itable();
1.1370 + assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_nonstatic_oop_maps(), "wrong offset calculation (1)");
1.1371 + assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)");
1.1372 +
1.1373 + // Visit all interfaces and initialize itable offset table
1.1374 + SetupItableClosure sic((address)klass(), ioe, ime);
1.1375 + visit_all_interfaces(klass->transitive_interfaces(), &sic);
1.1376 +
1.1377 +#ifdef ASSERT
1.1378 + ime = sic.method_entry();
1.1379 + oop* v = (oop*) klass->end_of_itable();
1.1380 + assert( (oop*)(ime) == v, "wrong offset calculation (2)");
1.1381 +#endif
1.1382 +}
1.1383 +
1.1384 +
1.1385 +// inverse to itable_index
1.1386 +Method* klassItable::method_for_itable_index(Klass* intf, int itable_index) {
1.1387 + assert(InstanceKlass::cast(intf)->is_interface(), "sanity check");
1.1388 + assert(intf->verify_itable_index(itable_index), "");
1.1389 + Array<Method*>* methods = InstanceKlass::cast(intf)->methods();
1.1390 +
1.1391 + if (itable_index < 0 || itable_index >= method_count_for_interface(intf))
1.1392 + return NULL; // help caller defend against bad indices
1.1393 +
1.1394 + int index = itable_index;
1.1395 + Method* m = methods->at(index);
1.1396 + int index2 = -1;
1.1397 + while (!m->has_itable_index() ||
1.1398 + (index2 = m->itable_index()) != itable_index) {
1.1399 + assert(index2 < itable_index, "monotonic");
1.1400 + if (++index == methods->length())
1.1401 + return NULL;
1.1402 + m = methods->at(index);
1.1403 + }
1.1404 + assert(m->itable_index() == itable_index, "correct inverse");
1.1405 +
1.1406 + return m;
1.1407 +}
1.1408 +
1.1409 +void klassVtable::verify(outputStream* st, bool forced) {
1.1410 + // make sure table is initialized
1.1411 + if (!Universe::is_fully_initialized()) return;
1.1412 +#ifndef PRODUCT
1.1413 + // avoid redundant verifies
1.1414 + if (!forced && _verify_count == Universe::verify_count()) return;
1.1415 + _verify_count = Universe::verify_count();
1.1416 +#endif
1.1417 + oop* end_of_obj = (oop*)_klass() + _klass()->size();
1.1418 + oop* end_of_vtable = (oop *)&table()[_length];
1.1419 + if (end_of_vtable > end_of_obj) {
1.1420 + fatal(err_msg("klass %s: klass object too short (vtable extends beyond "
1.1421 + "end)", _klass->internal_name()));
1.1422 + }
1.1423 +
1.1424 + for (int i = 0; i < _length; i++) table()[i].verify(this, st);
1.1425 + // verify consistency with superKlass vtable
1.1426 + Klass* super = _klass->super();
1.1427 + if (super != NULL) {
1.1428 + InstanceKlass* sk = InstanceKlass::cast(super);
1.1429 + klassVtable* vt = sk->vtable();
1.1430 + for (int i = 0; i < vt->length(); i++) {
1.1431 + verify_against(st, vt, i);
1.1432 + }
1.1433 + }
1.1434 +}
1.1435 +
1.1436 +void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) {
1.1437 + vtableEntry* vte = &vt->table()[index];
1.1438 + if (vte->method()->name() != table()[index].method()->name() ||
1.1439 + vte->method()->signature() != table()[index].method()->signature()) {
1.1440 + fatal("mismatched name/signature of vtable entries");
1.1441 + }
1.1442 +}
1.1443 +
1.1444 +#ifndef PRODUCT
1.1445 +void klassVtable::print() {
1.1446 + ResourceMark rm;
1.1447 + tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length());
1.1448 + for (int i = 0; i < length(); i++) {
1.1449 + table()[i].print();
1.1450 + tty->cr();
1.1451 + }
1.1452 +}
1.1453 +#endif
1.1454 +
1.1455 +void vtableEntry::verify(klassVtable* vt, outputStream* st) {
1.1456 + NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true));
1.1457 + assert(method() != NULL, "must have set method");
1.1458 + method()->verify();
1.1459 + // we sub_type, because it could be a miranda method
1.1460 + if (!vt->klass()->is_subtype_of(method()->method_holder())) {
1.1461 +#ifndef PRODUCT
1.1462 + print();
1.1463 +#endif
1.1464 + fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this));
1.1465 + }
1.1466 +}
1.1467 +
1.1468 +#ifndef PRODUCT
1.1469 +
1.1470 +void vtableEntry::print() {
1.1471 + ResourceMark rm;
1.1472 + tty->print("vtableEntry %s: ", method()->name()->as_C_string());
1.1473 + if (Verbose) {
1.1474 + tty->print("m %#lx ", (address)method());
1.1475 + }
1.1476 +}
1.1477 +
1.1478 +class VtableStats : AllStatic {
1.1479 + public:
1.1480 + static int no_klasses; // # classes with vtables
1.1481 + static int no_array_klasses; // # array classes
1.1482 + static int no_instance_klasses; // # instanceKlasses
1.1483 + static int sum_of_vtable_len; // total # of vtable entries
1.1484 + static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only
1.1485 + static int fixed; // total fixed overhead in bytes
1.1486 + static int filler; // overhead caused by filler bytes
1.1487 + static int entries; // total bytes consumed by vtable entries
1.1488 + static int array_entries; // total bytes consumed by array vtable entries
1.1489 +
1.1490 + static void do_class(Klass* k) {
1.1491 + Klass* kl = k;
1.1492 + klassVtable* vt = kl->vtable();
1.1493 + if (vt == NULL) return;
1.1494 + no_klasses++;
1.1495 + if (kl->oop_is_instance()) {
1.1496 + no_instance_klasses++;
1.1497 + kl->array_klasses_do(do_class);
1.1498 + }
1.1499 + if (kl->oop_is_array()) {
1.1500 + no_array_klasses++;
1.1501 + sum_of_array_vtable_len += vt->length();
1.1502 + }
1.1503 + sum_of_vtable_len += vt->length();
1.1504 + }
1.1505 +
1.1506 + static void compute() {
1.1507 + SystemDictionary::classes_do(do_class);
1.1508 + fixed = no_klasses * oopSize; // vtable length
1.1509 + // filler size is a conservative approximation
1.1510 + filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(InstanceKlass) - sizeof(ArrayKlass) - 1);
1.1511 + entries = sizeof(vtableEntry) * sum_of_vtable_len;
1.1512 + array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len;
1.1513 + }
1.1514 +};
1.1515 +
1.1516 +int VtableStats::no_klasses = 0;
1.1517 +int VtableStats::no_array_klasses = 0;
1.1518 +int VtableStats::no_instance_klasses = 0;
1.1519 +int VtableStats::sum_of_vtable_len = 0;
1.1520 +int VtableStats::sum_of_array_vtable_len = 0;
1.1521 +int VtableStats::fixed = 0;
1.1522 +int VtableStats::filler = 0;
1.1523 +int VtableStats::entries = 0;
1.1524 +int VtableStats::array_entries = 0;
1.1525 +
1.1526 +void klassVtable::print_statistics() {
1.1527 + ResourceMark rm;
1.1528 + HandleMark hm;
1.1529 + VtableStats::compute();
1.1530 + tty->print_cr("vtable statistics:");
1.1531 + tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses);
1.1532 + int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries;
1.1533 + tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed);
1.1534 + tty->print_cr("%6d bytes filler overhead", VtableStats::filler);
1.1535 + tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries);
1.1536 + tty->print_cr("%6d bytes total", total);
1.1537 +}
1.1538 +
1.1539 +int klassItable::_total_classes; // Total no. of classes with itables
1.1540 +long klassItable::_total_size; // Total no. of bytes used for itables
1.1541 +
1.1542 +void klassItable::print_statistics() {
1.1543 + tty->print_cr("itable statistics:");
1.1544 + tty->print_cr("%6d classes with itables", _total_classes);
1.1545 + tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes);
1.1546 +}
1.1547 +
1.1548 +#endif // PRODUCT
