author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 5403 | 6b0dd9c75dde |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "incls/_precompiled.incl" |
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#include "incls/_klassVtable.cpp.incl" |
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||
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inline instanceKlass* klassVtable::ik() const { |
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Klass* k = _klass()->klass_part(); |
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assert(k->oop_is_instance(), "not an instanceKlass"); |
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return (instanceKlass*)k; |
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} |
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||
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||
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// this function computes the vtable size (including the size needed for miranda |
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// methods) and the number of miranda methods in this class |
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// Note on Miranda methods: Let's say there is a class C that implements |
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// interface I. Let's say there is a method m in I that neither C nor any |
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// of its super classes implement (i.e there is no method of any access, with |
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// the same name and signature as m), then m is a Miranda method which is |
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// entered as a public abstract method in C's vtable. From then on it should |
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// treated as any other public method in C for method over-ride purposes. |
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void klassVtable::compute_vtable_size_and_num_mirandas(int &vtable_length, |
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int &num_miranda_methods, |
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klassOop super, |
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objArrayOop methods, |
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AccessFlags class_flags, |
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Handle classloader, |
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symbolHandle classname, |
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objArrayOop local_interfaces, |
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TRAPS |
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) { |
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No_Safepoint_Verifier nsv; |
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// set up default result values |
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vtable_length = 0; |
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num_miranda_methods = 0; |
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// start off with super's vtable length |
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instanceKlass* sk = (instanceKlass*)super->klass_part(); |
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vtable_length = super == NULL ? 0 : sk->vtable_length(); |
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// go thru each method in the methods table to see if it needs a new entry |
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int len = methods->length(); |
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for (int i = 0; i < len; i++) { |
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assert(methods->obj_at(i)->is_method(), "must be a methodOop"); |
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methodHandle mh(THREAD, methodOop(methods->obj_at(i))); |
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if (needs_new_vtable_entry(mh, super, classloader, classname, class_flags, THREAD)) { |
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vtable_length += vtableEntry::size(); // we need a new entry |
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} |
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} |
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// compute the number of mirandas methods that must be added to the end |
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num_miranda_methods = get_num_mirandas(super, methods, local_interfaces); |
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vtable_length += (num_miranda_methods * vtableEntry::size()); |
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if (Universe::is_bootstrapping() && vtable_length == 0) { |
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// array classes don't have their superclass set correctly during |
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// bootstrapping |
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vtable_length = Universe::base_vtable_size(); |
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} |
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if (super == NULL && !Universe::is_bootstrapping() && |
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vtable_length != Universe::base_vtable_size()) { |
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// Someone is attempting to redefine java.lang.Object incorrectly. The |
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// only way this should happen is from |
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// SystemDictionary::resolve_from_stream(), which will detect this later |
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// and throw a security exception. So don't assert here to let |
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// the exception occur. |
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vtable_length = Universe::base_vtable_size(); |
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} |
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assert(super != NULL || vtable_length == Universe::base_vtable_size(), |
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"bad vtable size for class Object"); |
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assert(vtable_length % vtableEntry::size() == 0, "bad vtable length"); |
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assert(vtable_length >= Universe::base_vtable_size(), "vtable too small"); |
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} |
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int klassVtable::index_of(methodOop m, int len) const { |
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assert(m->vtable_index() >= 0, "do not ask this of non-vtable methods"); |
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return m->vtable_index(); |
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} |
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int klassVtable::initialize_from_super(KlassHandle super) { |
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if (super.is_null()) { |
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return 0; |
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} else { |
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// copy methods from superKlass |
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// can't inherit from array class, so must be instanceKlass |
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assert(super->oop_is_instance(), "must be instance klass"); |
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instanceKlass* sk = (instanceKlass*)super()->klass_part(); |
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klassVtable* superVtable = sk->vtable(); |
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assert(superVtable->length() <= _length, "vtable too short"); |
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#ifdef ASSERT |
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superVtable->verify(tty, true); |
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#endif |
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superVtable->copy_vtable_to(table()); |
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#ifndef PRODUCT |
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120 |
if (PrintVtables && Verbose) { |
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ResourceMark rm; |
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tty->print_cr("copy vtable from %s to %s size %d", sk->internal_name(), klass()->internal_name(), _length); |
123 |
} |
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#endif |
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return superVtable->length(); |
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} |
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} |
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128 |
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// Revised lookup semantics introduced 1.3 (Kestral beta) |
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void klassVtable::initialize_vtable(bool checkconstraints, TRAPS) { |
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// Note: Arrays can have intermediate array supers. Use java_super to skip them. |
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KlassHandle super (THREAD, klass()->java_super()); |
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int nofNewEntries = 0; |
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135 |
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137 |
if (PrintVtables && !klass()->oop_is_array()) { |
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ResourceMark rm(THREAD); |
|
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tty->print_cr("Initializing: %s", _klass->name()->as_C_string()); |
|
140 |
} |
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142 |
#ifdef ASSERT |
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oop* end_of_obj = (oop*)_klass() + _klass()->size(); |
|
144 |
oop* end_of_vtable = (oop*)&table()[_length]; |
|
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assert(end_of_vtable <= end_of_obj, "vtable extends beyond end"); |
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#endif |
|
147 |
||
148 |
if (Universe::is_bootstrapping()) { |
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// just clear everything |
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for (int i = 0; i < _length; i++) table()[i].clear(); |
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return; |
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152 |
} |
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int super_vtable_len = initialize_from_super(super); |
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if (klass()->oop_is_array()) { |
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assert(super_vtable_len == _length, "arrays shouldn't introduce new methods"); |
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157 |
} else { |
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158 |
assert(_klass->oop_is_instance(), "must be instanceKlass"); |
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objArrayHandle methods(THREAD, ik()->methods()); |
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int len = methods()->length(); |
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int initialized = super_vtable_len; |
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// update_inherited_vtable can stop for gc - ensure using handles |
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for (int i = 0; i < len; i++) { |
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HandleMark hm(THREAD); |
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assert(methods()->obj_at(i)->is_method(), "must be a methodOop"); |
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methodHandle mh(THREAD, (methodOop)methods()->obj_at(i)); |
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bool needs_new_entry = update_inherited_vtable(ik(), mh, super_vtable_len, checkconstraints, CHECK); |
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if (needs_new_entry) { |
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put_method_at(mh(), initialized); |
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mh()->set_vtable_index(initialized); // set primary vtable index |
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initialized++; |
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} |
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} |
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// add miranda methods; it will also update the value of initialized |
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fill_in_mirandas(initialized); |
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// In class hierarchies where the accessibility is not increasing (i.e., going from private -> |
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// package_private -> publicprotected), the vtable might actually be smaller than our initial |
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// calculation. |
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assert(initialized <= _length, "vtable initialization failed"); |
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for(;initialized < _length; initialized++) { |
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put_method_at(NULL, initialized); |
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} |
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NOT_PRODUCT(verify(tty, true)); |
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} |
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} |
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// Called for cases where a method does not override its superclass' vtable entry |
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// For bytecodes not produced by javac together it is possible that a method does not override |
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// the superclass's method, but might indirectly override a super-super class's vtable entry |
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// If none found, return a null superk, else return the superk of the method this does override |
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instanceKlass* klassVtable::find_transitive_override(instanceKlass* initialsuper, methodHandle target_method, |
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int vtable_index, Handle target_loader, symbolHandle target_classname, Thread * THREAD) { |
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instanceKlass* superk = initialsuper; |
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while (superk != NULL && superk->super() != NULL) { |
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instanceKlass* supersuperklass = instanceKlass::cast(superk->super()); |
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klassVtable* ssVtable = supersuperklass->vtable(); |
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if (vtable_index < ssVtable->length()) { |
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methodOop super_method = ssVtable->method_at(vtable_index); |
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#ifndef PRODUCT |
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symbolHandle name(THREAD,target_method()->name()); |
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symbolHandle signature(THREAD,target_method()->signature()); |
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assert(super_method->name() == name() && super_method->signature() == signature(), "vtable entry name/sig mismatch"); |
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#endif |
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if (supersuperklass->is_override(super_method, target_loader, target_classname, THREAD)) { |
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#ifndef PRODUCT |
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if (PrintVtables && Verbose) { |
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ResourceMark rm(THREAD); |
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tty->print("transitive overriding superclass %s with %s::%s index %d, original flags: ", |
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supersuperklass->internal_name(), |
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_klass->internal_name(), (target_method() != NULL) ? |
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target_method()->name()->as_C_string() : "<NULL>", vtable_index); |
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super_method->access_flags().print_on(tty); |
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tty->print("overriders flags: "); |
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target_method->access_flags().print_on(tty); |
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tty->cr(); |
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} |
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#endif /*PRODUCT*/ |
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224 |
break; // return found superk |
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225 |
} |
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226 |
} else { |
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// super class has no vtable entry here, stop transitive search |
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superk = (instanceKlass*)NULL; |
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break; |
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230 |
} |
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231 |
// if no override found yet, continue to search up |
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superk = instanceKlass::cast(superk->super()); |
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} |
1 | 234 |
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return superk; |
1 | 236 |
} |
237 |
||
238 |
||
239 |
// Update child's copy of super vtable for overrides |
|
240 |
// OR return true if a new vtable entry is required |
|
241 |
// Only called for instanceKlass's, i.e. not for arrays |
|
242 |
// If that changed, could not use _klass as handle for klass |
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bool klassVtable::update_inherited_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, |
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bool checkconstraints, TRAPS) { |
1 | 245 |
ResourceMark rm; |
246 |
bool allocate_new = true; |
|
247 |
assert(klass->oop_is_instance(), "must be instanceKlass"); |
|
248 |
||
249 |
// Initialize the method's vtable index to "nonvirtual". |
|
250 |
// If we allocate a vtable entry, we will update it to a non-negative number. |
|
251 |
target_method()->set_vtable_index(methodOopDesc::nonvirtual_vtable_index); |
|
252 |
||
253 |
// Static and <init> methods are never in |
|
254 |
if (target_method()->is_static() || target_method()->name() == vmSymbols::object_initializer_name()) { |
|
255 |
return false; |
|
256 |
} |
|
257 |
||
258 |
if (klass->is_final() || target_method()->is_final()) { |
|
259 |
// a final method never needs a new entry; final methods can be statically |
|
260 |
// resolved and they have to be present in the vtable only if they override |
|
261 |
// a super's method, in which case they re-use its entry |
|
262 |
allocate_new = false; |
|
263 |
} |
|
264 |
||
265 |
// we need a new entry if there is no superclass |
|
266 |
if (klass->super() == NULL) { |
|
267 |
return allocate_new; |
|
268 |
} |
|
269 |
||
270 |
// private methods always have a new entry in the vtable |
|
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271 |
// specification interpretation since classic has |
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272 |
// private methods not overriding |
1 | 273 |
if (target_method()->is_private()) { |
274 |
return allocate_new; |
|
275 |
} |
|
276 |
||
277 |
// search through the vtable and update overridden entries |
|
278 |
// Since check_signature_loaders acquires SystemDictionary_lock |
|
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279 |
// which can block for gc, once we are in this loop, use handles |
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280 |
// For classfiles built with >= jdk7, we now look for transitive overrides |
1 | 281 |
|
282 |
symbolHandle name(THREAD,target_method()->name()); |
|
283 |
symbolHandle signature(THREAD,target_method()->signature()); |
|
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284 |
Handle target_loader(THREAD, _klass->class_loader()); |
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|
285 |
symbolHandle target_classname(THREAD, _klass->name()); |
1 | 286 |
for(int i = 0; i < super_vtable_len; i++) { |
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287 |
methodOop super_method = method_at(i); |
1 | 288 |
// Check if method name matches |
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|
289 |
if (super_method->name() == name() && super_method->signature() == signature()) { |
1 | 290 |
|
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|
291 |
// get super_klass for method_holder for the found method |
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292 |
instanceKlass* super_klass = instanceKlass::cast(super_method->method_holder()); |
1 | 293 |
|
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294 |
if ((super_klass->is_override(super_method, target_loader, target_classname, THREAD)) || |
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295 |
((klass->major_version() >= VTABLE_TRANSITIVE_OVERRIDE_VERSION) |
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|
296 |
&& ((super_klass = find_transitive_override(super_klass, target_method, i, target_loader, |
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|
297 |
target_classname, THREAD)) != (instanceKlass*)NULL))) { |
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|
298 |
// overriding, so no new entry |
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|
299 |
allocate_new = false; |
1 | 300 |
|
301 |
if (checkconstraints) { |
|
302 |
// Override vtable entry if passes loader constraint check |
|
303 |
// if loader constraint checking requested |
|
304 |
// No need to visit his super, since he and his super |
|
305 |
// have already made any needed loader constraints. |
|
306 |
// Since loader constraints are transitive, it is enough |
|
307 |
// to link to the first super, and we get all the others. |
|
308 |
Handle super_loader(THREAD, super_klass->class_loader()); |
|
309 |
||
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|
310 |
if (target_loader() != super_loader()) { |
1 | 311 |
ResourceMark rm(THREAD); |
312 |
char* failed_type_name = |
|
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|
313 |
SystemDictionary::check_signature_loaders(signature, target_loader, |
1 | 314 |
super_loader, true, |
315 |
CHECK_(false)); |
|
316 |
if (failed_type_name != NULL) { |
|
317 |
const char* msg = "loader constraint violation: when resolving " |
|
318 |
"overridden method \"%s\" the class loader (instance" |
|
319 |
" of %s) of the current class, %s, and its superclass loader " |
|
320 |
"(instance of %s), have different Class objects for the type " |
|
321 |
"%s used in the signature"; |
|
322 |
char* sig = target_method()->name_and_sig_as_C_string(); |
|
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|
323 |
const char* loader1 = SystemDictionary::loader_name(target_loader()); |
1 | 324 |
char* current = _klass->name()->as_C_string(); |
325 |
const char* loader2 = SystemDictionary::loader_name(super_loader()); |
|
326 |
size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
|
327 |
strlen(current) + strlen(loader2) + strlen(failed_type_name); |
|
328 |
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); |
|
329 |
jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, |
|
330 |
failed_type_name); |
|
331 |
THROW_MSG_(vmSymbols::java_lang_LinkageError(), buf, false); |
|
332 |
} |
|
333 |
} |
|
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334 |
} |
1 | 335 |
|
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|
336 |
put_method_at(target_method(), i); |
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|
337 |
target_method()->set_vtable_index(i); |
1 | 338 |
#ifndef PRODUCT |
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|
339 |
if (PrintVtables && Verbose) { |
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|
340 |
tty->print("overriding with %s::%s index %d, original flags: ", |
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|
341 |
_klass->internal_name(), (target_method() != NULL) ? |
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|
342 |
target_method()->name()->as_C_string() : "<NULL>", i); |
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|
343 |
super_method->access_flags().print_on(tty); |
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|
344 |
tty->print("overriders flags: "); |
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|
345 |
target_method->access_flags().print_on(tty); |
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|
346 |
tty->cr(); |
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|
347 |
} |
1 | 348 |
#endif /*PRODUCT*/ |
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|
349 |
} else { |
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|
350 |
// allocate_new = true; default. We might override one entry, |
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|
351 |
// but not override another. Once we override one, not need new |
1 | 352 |
#ifndef PRODUCT |
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|
353 |
if (PrintVtables && Verbose) { |
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|
354 |
tty->print("NOT overriding with %s::%s index %d, original flags: ", |
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|
355 |
_klass->internal_name(), (target_method() != NULL) ? |
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|
356 |
target_method()->name()->as_C_string() : "<NULL>", i); |
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|
357 |
super_method->access_flags().print_on(tty); |
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|
358 |
tty->print("overriders flags: "); |
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|
359 |
target_method->access_flags().print_on(tty); |
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|
360 |
tty->cr(); |
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|
361 |
} |
1 | 362 |
#endif /*PRODUCT*/ |
363 |
} |
|
364 |
} |
|
365 |
} |
|
366 |
return allocate_new; |
|
367 |
} |
|
368 |
||
369 |
void klassVtable::put_method_at(methodOop m, int index) { |
|
370 |
assert(m->is_oop_or_null(), "Not an oop or null"); |
|
371 |
#ifndef PRODUCT |
|
372 |
if (PrintVtables && Verbose) { |
|
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|
373 |
ResourceMark rm; |
1 | 374 |
tty->print_cr("adding %s::%s at index %d", _klass->internal_name(), |
375 |
(m != NULL) ? m->name()->as_C_string() : "<NULL>", index); |
|
376 |
} |
|
377 |
assert(unchecked_method_at(index)->is_oop_or_null(), "Not an oop or null"); |
|
378 |
#endif |
|
379 |
table()[index].set(m); |
|
380 |
} |
|
381 |
||
382 |
// Find out if a method "m" with superclass "super", loader "classloader" and |
|
383 |
// name "classname" needs a new vtable entry. Let P be a class package defined |
|
384 |
// by "classloader" and "classname". |
|
385 |
// NOTE: The logic used here is very similar to the one used for computing |
|
386 |
// the vtables indices for a method. We cannot directly use that function because, |
|
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|
387 |
// we allocate the instanceKlass at load time, and that requires that the |
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|
388 |
// superclass has been loaded. |
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|
389 |
// However, the vtable entries are filled in at link time, and therefore |
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|
390 |
// the superclass' vtable may not yet have been filled in. |
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|
391 |
bool klassVtable::needs_new_vtable_entry(methodHandle target_method, |
1 | 392 |
klassOop super, |
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|
393 |
Handle classloader, |
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|
394 |
symbolHandle classname, |
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|
395 |
AccessFlags class_flags, |
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|
396 |
TRAPS) { |
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|
397 |
if ((class_flags.is_final() || target_method()->is_final()) || |
1 | 398 |
// a final method never needs a new entry; final methods can be statically |
399 |
// resolved and they have to be present in the vtable only if they override |
|
400 |
// a super's method, in which case they re-use its entry |
|
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|
401 |
(target_method()->is_static()) || |
1 | 402 |
// static methods don't need to be in vtable |
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|
403 |
(target_method()->name() == vmSymbols::object_initializer_name()) |
1 | 404 |
// <init> is never called dynamically-bound |
405 |
) { |
|
406 |
return false; |
|
407 |
} |
|
408 |
||
409 |
// we need a new entry if there is no superclass |
|
410 |
if (super == NULL) { |
|
411 |
return true; |
|
412 |
} |
|
413 |
||
414 |
// private methods always have a new entry in the vtable |
|
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|
415 |
// specification interpretation since classic has |
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|
416 |
// private methods not overriding |
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|
417 |
if (target_method()->is_private()) { |
1 | 418 |
return true; |
419 |
} |
|
420 |
||
421 |
// search through the super class hierarchy to see if we need |
|
422 |
// a new entry |
|
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|
423 |
ResourceMark rm; |
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|
424 |
symbolOop name = target_method()->name(); |
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|
425 |
symbolOop signature = target_method()->signature(); |
1 | 426 |
klassOop k = super; |
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|
427 |
methodOop super_method = NULL; |
1 | 428 |
instanceKlass *holder = NULL; |
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|
429 |
methodOop recheck_method = NULL; |
1 | 430 |
while (k != NULL) { |
431 |
// lookup through the hierarchy for a method with matching name and sign. |
|
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|
432 |
super_method = instanceKlass::cast(k)->lookup_method(name, signature); |
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|
433 |
if (super_method == NULL) { |
1 | 434 |
break; // we still have to search for a matching miranda method |
435 |
} |
|
436 |
// get the class holding the matching method |
|
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|
437 |
// make sure you use that class for is_override |
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|
438 |
instanceKlass* superk = instanceKlass::cast(super_method->method_holder()); |
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|
439 |
// we want only instance method matches |
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|
440 |
// pretend private methods are not in the super vtable |
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|
441 |
// since we do override around them: e.g. a.m pub/b.m private/c.m pub, |
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|
442 |
// ignore private, c.m pub does override a.m pub |
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|
443 |
// For classes that were not javac'd together, we also do transitive overriding around |
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|
444 |
// methods that have less accessibility |
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|
445 |
if ((!super_method->is_static()) && |
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|
446 |
(!super_method->is_private())) { |
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|
447 |
if (superk->is_override(super_method, classloader, classname, THREAD)) { |
1 | 448 |
return false; |
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|
449 |
// else keep looking for transitive overrides |
1 | 450 |
} |
451 |
} |
|
452 |
||
2264
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|
453 |
// Start with lookup result and continue to search up |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
454 |
k = superk->super(); // haven't found an override match yet; continue to look |
1 | 455 |
} |
456 |
||
457 |
// if the target method is public or protected it may have a matching |
|
458 |
// miranda method in the super, whose entry it should re-use. |
|
2264
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
459 |
// Actually, to handle cases that javac would not generate, we need |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
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parents:
2136
diff
changeset
|
460 |
// this check for all access permissions. |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
461 |
instanceKlass *sk = instanceKlass::cast(super); |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
462 |
if (sk->has_miranda_methods()) { |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
463 |
if (sk->lookup_method_in_all_interfaces(name, signature) != NULL) { |
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
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diff
changeset
|
464 |
return false; // found a matching miranda; we do not need a new entry |
1 | 465 |
} |
466 |
} |
|
467 |
return true; // found no match; we need a new entry |
|
468 |
} |
|
469 |
||
470 |
// Support for miranda methods |
|
471 |
||
472 |
// get the vtable index of a miranda method with matching "name" and "signature" |
|
473 |
int klassVtable::index_of_miranda(symbolOop name, symbolOop signature) { |
|
474 |
// search from the bottom, might be faster |
|
475 |
for (int i = (length() - 1); i >= 0; i--) { |
|
476 |
methodOop m = table()[i].method(); |
|
477 |
if (is_miranda_entry_at(i) && |
|
478 |
m->name() == name && m->signature() == signature) { |
|
479 |
return i; |
|
480 |
} |
|
481 |
} |
|
482 |
return methodOopDesc::invalid_vtable_index; |
|
483 |
} |
|
484 |
||
485 |
// check if an entry is miranda |
|
486 |
bool klassVtable::is_miranda_entry_at(int i) { |
|
487 |
methodOop m = method_at(i); |
|
488 |
klassOop method_holder = m->method_holder(); |
|
489 |
instanceKlass *mhk = instanceKlass::cast(method_holder); |
|
490 |
||
491 |
// miranda methods are interface methods in a class's vtable |
|
492 |
if (mhk->is_interface()) { |
|
493 |
assert(m->is_public() && m->is_abstract(), "should be public and abstract"); |
|
494 |
assert(ik()->implements_interface(method_holder) , "this class should implement the interface"); |
|
495 |
assert(is_miranda(m, ik()->methods(), ik()->super()), "should be a miranda_method"); |
|
496 |
return true; |
|
497 |
} |
|
498 |
return false; |
|
499 |
} |
|
500 |
||
501 |
// check if a method is a miranda method, given a class's methods table and it's super |
|
502 |
// the caller must make sure that the method belongs to an interface implemented by the class |
|
503 |
bool klassVtable::is_miranda(methodOop m, objArrayOop class_methods, klassOop super) { |
|
504 |
symbolOop name = m->name(); |
|
505 |
symbolOop signature = m->signature(); |
|
506 |
if (instanceKlass::find_method(class_methods, name, signature) == NULL) { |
|
507 |
// did not find it in the method table of the current class |
|
508 |
if (super == NULL) { |
|
509 |
// super doesn't exist |
|
510 |
return true; |
|
511 |
} else { |
|
512 |
if (instanceKlass::cast(super)->lookup_method(name, signature) == NULL) { |
|
513 |
// super class hierarchy does not implement it |
|
514 |
return true; |
|
515 |
} |
|
516 |
} |
|
517 |
} |
|
518 |
return false; |
|
519 |
} |
|
520 |
||
521 |
void klassVtable::add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, |
|
522 |
objArrayOop current_interface_methods, |
|
523 |
objArrayOop class_methods, |
|
524 |
klassOop super) { |
|
525 |
// iterate thru the current interface's method to see if it a miranda |
|
526 |
int num_methods = current_interface_methods->length(); |
|
527 |
for (int i = 0; i < num_methods; i++) { |
|
528 |
methodOop im = methodOop(current_interface_methods->obj_at(i)); |
|
529 |
bool is_duplicate = false; |
|
530 |
int num_of_current_mirandas = list_of_current_mirandas->length(); |
|
531 |
// check for duplicate mirandas in different interfaces we implement |
|
532 |
for (int j = 0; j < num_of_current_mirandas; j++) { |
|
533 |
methodOop miranda = list_of_current_mirandas->at(j); |
|
534 |
if ((im->name() == miranda->name()) && |
|
535 |
(im->signature() == miranda->signature())) { |
|
536 |
is_duplicate = true; |
|
537 |
break; |
|
538 |
} |
|
539 |
} |
|
540 |
||
541 |
if (!is_duplicate) { // we don't want duplicate miranda entries in the vtable |
|
542 |
if (is_miranda(im, class_methods, super)) { // is it a miranda at all? |
|
543 |
instanceKlass *sk = instanceKlass::cast(super); |
|
544 |
// check if it is a duplicate of a super's miranda |
|
545 |
if (sk->lookup_method_in_all_interfaces(im->name(), im->signature()) == NULL) { |
|
546 |
list_of_current_mirandas->append(im); |
|
547 |
} |
|
548 |
} |
|
549 |
} |
|
550 |
} |
|
551 |
} |
|
552 |
||
553 |
void klassVtable::get_mirandas(GrowableArray<methodOop>* mirandas, |
|
554 |
klassOop super, objArrayOop class_methods, |
|
555 |
objArrayOop local_interfaces) { |
|
556 |
assert((mirandas->length() == 0) , "current mirandas must be 0"); |
|
557 |
||
558 |
// iterate thru the local interfaces looking for a miranda |
|
559 |
int num_local_ifs = local_interfaces->length(); |
|
560 |
for (int i = 0; i < num_local_ifs; i++) { |
|
561 |
instanceKlass *ik = instanceKlass::cast(klassOop(local_interfaces->obj_at(i))); |
|
562 |
add_new_mirandas_to_list(mirandas, ik->methods(), class_methods, super); |
|
563 |
// iterate thru each local's super interfaces |
|
564 |
objArrayOop super_ifs = ik->transitive_interfaces(); |
|
565 |
int num_super_ifs = super_ifs->length(); |
|
566 |
for (int j = 0; j < num_super_ifs; j++) { |
|
567 |
instanceKlass *sik = instanceKlass::cast(klassOop(super_ifs->obj_at(j))); |
|
568 |
add_new_mirandas_to_list(mirandas, sik->methods(), class_methods, super); |
|
569 |
} |
|
570 |
} |
|
571 |
} |
|
572 |
||
573 |
// get number of mirandas |
|
574 |
int klassVtable::get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces) { |
|
575 |
ResourceMark rm; |
|
576 |
GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); |
|
577 |
get_mirandas(mirandas, super, class_methods, local_interfaces); |
|
578 |
return mirandas->length(); |
|
579 |
} |
|
580 |
||
581 |
// fill in mirandas |
|
582 |
void klassVtable::fill_in_mirandas(int& initialized) { |
|
583 |
ResourceMark rm; |
|
584 |
GrowableArray<methodOop>* mirandas = new GrowableArray<methodOop>(20); |
|
585 |
instanceKlass *this_ik = ik(); |
|
586 |
get_mirandas(mirandas, this_ik->super(), this_ik->methods(), this_ik->local_interfaces()); |
|
587 |
int num_mirandas = mirandas->length(); |
|
588 |
for (int i = 0; i < num_mirandas; i++) { |
|
589 |
put_method_at(mirandas->at(i), initialized); |
|
590 |
initialized++; |
|
591 |
} |
|
592 |
} |
|
593 |
||
594 |
void klassVtable::copy_vtable_to(vtableEntry* start) { |
|
595 |
Copy::disjoint_words((HeapWord*)table(), (HeapWord*)start, _length * vtableEntry::size()); |
|
596 |
} |
|
597 |
||
598 |
void klassVtable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, |
|
599 |
int methods_length, bool * trace_name_printed) { |
|
600 |
// search the vtable for uses of either obsolete or EMCP methods |
|
601 |
for (int j = 0; j < methods_length; j++) { |
|
602 |
methodOop old_method = old_methods[j]; |
|
603 |
methodOop new_method = new_methods[j]; |
|
604 |
||
605 |
// In the vast majority of cases we could get the vtable index |
|
606 |
// by using: old_method->vtable_index() |
|
607 |
// However, there are rare cases, eg. sun.awt.X11.XDecoratedPeer.getX() |
|
608 |
// in sun.awt.X11.XFramePeer where methods occur more than once in the |
|
609 |
// vtable, so, alas, we must do an exhaustive search. |
|
610 |
for (int index = 0; index < length(); index++) { |
|
611 |
if (unchecked_method_at(index) == old_method) { |
|
612 |
put_method_at(new_method, index); |
|
613 |
||
614 |
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
|
615 |
if (!(*trace_name_printed)) { |
|
616 |
// RC_TRACE_MESG macro has an embedded ResourceMark |
|
617 |
RC_TRACE_MESG(("adjust: name=%s", |
|
618 |
Klass::cast(old_method->method_holder())->external_name())); |
|
619 |
*trace_name_printed = true; |
|
620 |
} |
|
621 |
// RC_TRACE macro has an embedded ResourceMark |
|
622 |
RC_TRACE(0x00100000, ("vtable method update: %s(%s)", |
|
623 |
new_method->name()->as_C_string(), |
|
624 |
new_method->signature()->as_C_string())); |
|
625 |
} |
|
626 |
} |
|
627 |
} |
|
628 |
} |
|
629 |
} |
|
630 |
||
631 |
||
632 |
// Garbage collection |
|
633 |
void klassVtable::oop_follow_contents() { |
|
634 |
int len = length(); |
|
635 |
for (int i = 0; i < len; i++) { |
|
636 |
MarkSweep::mark_and_push(adr_method_at(i)); |
|
637 |
} |
|
638 |
} |
|
639 |
||
640 |
#ifndef SERIALGC |
|
641 |
void klassVtable::oop_follow_contents(ParCompactionManager* cm) { |
|
642 |
int len = length(); |
|
643 |
for (int i = 0; i < len; i++) { |
|
644 |
PSParallelCompact::mark_and_push(cm, adr_method_at(i)); |
|
645 |
} |
|
646 |
} |
|
647 |
#endif // SERIALGC |
|
648 |
||
649 |
void klassVtable::oop_adjust_pointers() { |
|
650 |
int len = length(); |
|
651 |
for (int i = 0; i < len; i++) { |
|
652 |
MarkSweep::adjust_pointer(adr_method_at(i)); |
|
653 |
} |
|
654 |
} |
|
655 |
||
656 |
#ifndef SERIALGC |
|
657 |
void klassVtable::oop_update_pointers(ParCompactionManager* cm) { |
|
658 |
const int n = length(); |
|
659 |
for (int i = 0; i < n; i++) { |
|
660 |
PSParallelCompact::adjust_pointer(adr_method_at(i)); |
|
661 |
} |
|
662 |
} |
|
663 |
||
664 |
void klassVtable::oop_update_pointers(ParCompactionManager* cm, |
|
665 |
HeapWord* beg_addr, HeapWord* end_addr) { |
|
666 |
const int n = length(); |
|
667 |
const int entry_size = vtableEntry::size(); |
|
668 |
||
669 |
int beg_idx = 0; |
|
670 |
HeapWord* const method_0 = (HeapWord*)adr_method_at(0); |
|
671 |
if (beg_addr > method_0) { |
|
672 |
// it's safe to use cast, as we have guarantees on vtable size to be sane |
|
673 |
beg_idx = int((pointer_delta(beg_addr, method_0) + entry_size - 1) / entry_size); |
|
674 |
} |
|
675 |
||
676 |
oop* const beg_oop = adr_method_at(beg_idx); |
|
677 |
oop* const end_oop = MIN2((oop*)end_addr, adr_method_at(n)); |
|
678 |
for (oop* cur_oop = beg_oop; cur_oop < end_oop; cur_oop += entry_size) { |
|
679 |
PSParallelCompact::adjust_pointer(cur_oop); |
|
680 |
} |
|
681 |
} |
|
682 |
#endif // SERIALGC |
|
683 |
||
684 |
// Iterators |
|
685 |
void klassVtable::oop_oop_iterate(OopClosure* blk) { |
|
686 |
int len = length(); |
|
687 |
for (int i = 0; i < len; i++) { |
|
688 |
blk->do_oop(adr_method_at(i)); |
|
689 |
} |
|
690 |
} |
|
691 |
||
692 |
void klassVtable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { |
|
693 |
int len = length(); |
|
694 |
int i; |
|
695 |
for (i = 0; i < len; i++) { |
|
696 |
if ((HeapWord*)adr_method_at(i) >= mr.start()) break; |
|
697 |
} |
|
698 |
for (; i < len; i++) { |
|
699 |
oop* adr = adr_method_at(i); |
|
700 |
if ((HeapWord*)adr < mr.end()) blk->do_oop(adr); |
|
701 |
} |
|
702 |
} |
|
703 |
||
704 |
//----------------------------------------------------------------------------------------- |
|
705 |
// Itable code |
|
706 |
||
707 |
// Initialize a itableMethodEntry |
|
708 |
void itableMethodEntry::initialize(methodOop m) { |
|
709 |
if (m == NULL) return; |
|
710 |
||
711 |
_method = m; |
|
712 |
} |
|
713 |
||
714 |
klassItable::klassItable(instanceKlassHandle klass) { |
|
715 |
_klass = klass; |
|
716 |
||
717 |
if (klass->itable_length() > 0) { |
|
718 |
itableOffsetEntry* offset_entry = (itableOffsetEntry*)klass->start_of_itable(); |
|
719 |
if (offset_entry != NULL && offset_entry->interface_klass() != NULL) { // Check that itable is initialized |
|
720 |
// First offset entry points to the first method_entry |
|
721 |
intptr_t* method_entry = (intptr_t *)(((address)klass->as_klassOop()) + offset_entry->offset()); |
|
722 |
intptr_t* end = klass->end_of_itable(); |
|
723 |
||
724 |
_table_offset = (intptr_t*)offset_entry - (intptr_t*)klass->as_klassOop(); |
|
725 |
_size_offset_table = (method_entry - ((intptr_t*)offset_entry)) / itableOffsetEntry::size(); |
|
726 |
_size_method_table = (end - method_entry) / itableMethodEntry::size(); |
|
727 |
assert(_table_offset >= 0 && _size_offset_table >= 0 && _size_method_table >= 0, "wrong computation"); |
|
728 |
return; |
|
729 |
} |
|
730 |
} |
|
731 |
||
189
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
732 |
// The length of the itable was either zero, or it has not yet been initialized. |
1 | 733 |
_table_offset = 0; |
734 |
_size_offset_table = 0; |
|
735 |
_size_method_table = 0; |
|
736 |
} |
|
737 |
||
738 |
// Garbage Collection |
|
739 |
||
740 |
void klassItable::oop_follow_contents() { |
|
741 |
// offset table |
|
742 |
itableOffsetEntry* ioe = offset_entry(0); |
|
743 |
for(int i = 0; i < _size_offset_table; i++) { |
|
744 |
MarkSweep::mark_and_push((oop*)&ioe->_interface); |
|
745 |
ioe++; |
|
746 |
} |
|
747 |
||
748 |
// method table |
|
749 |
itableMethodEntry* ime = method_entry(0); |
|
750 |
for(int j = 0; j < _size_method_table; j++) { |
|
751 |
MarkSweep::mark_and_push((oop*)&ime->_method); |
|
752 |
ime++; |
|
753 |
} |
|
754 |
} |
|
755 |
||
756 |
#ifndef SERIALGC |
|
757 |
void klassItable::oop_follow_contents(ParCompactionManager* cm) { |
|
758 |
// offset table |
|
759 |
itableOffsetEntry* ioe = offset_entry(0); |
|
760 |
for(int i = 0; i < _size_offset_table; i++) { |
|
761 |
PSParallelCompact::mark_and_push(cm, (oop*)&ioe->_interface); |
|
762 |
ioe++; |
|
763 |
} |
|
764 |
||
765 |
// method table |
|
766 |
itableMethodEntry* ime = method_entry(0); |
|
767 |
for(int j = 0; j < _size_method_table; j++) { |
|
768 |
PSParallelCompact::mark_and_push(cm, (oop*)&ime->_method); |
|
769 |
ime++; |
|
770 |
} |
|
771 |
} |
|
772 |
#endif // SERIALGC |
|
773 |
||
774 |
void klassItable::oop_adjust_pointers() { |
|
775 |
// offset table |
|
776 |
itableOffsetEntry* ioe = offset_entry(0); |
|
777 |
for(int i = 0; i < _size_offset_table; i++) { |
|
778 |
MarkSweep::adjust_pointer((oop*)&ioe->_interface); |
|
779 |
ioe++; |
|
780 |
} |
|
781 |
||
782 |
// method table |
|
783 |
itableMethodEntry* ime = method_entry(0); |
|
784 |
for(int j = 0; j < _size_method_table; j++) { |
|
785 |
MarkSweep::adjust_pointer((oop*)&ime->_method); |
|
786 |
ime++; |
|
787 |
} |
|
788 |
} |
|
789 |
||
790 |
#ifndef SERIALGC |
|
791 |
void klassItable::oop_update_pointers(ParCompactionManager* cm) { |
|
792 |
// offset table |
|
793 |
itableOffsetEntry* ioe = offset_entry(0); |
|
794 |
for(int i = 0; i < _size_offset_table; i++) { |
|
795 |
PSParallelCompact::adjust_pointer((oop*)&ioe->_interface); |
|
796 |
ioe++; |
|
797 |
} |
|
798 |
||
799 |
// method table |
|
800 |
itableMethodEntry* ime = method_entry(0); |
|
801 |
for(int j = 0; j < _size_method_table; j++) { |
|
802 |
PSParallelCompact::adjust_pointer((oop*)&ime->_method); |
|
803 |
ime++; |
|
804 |
} |
|
805 |
} |
|
806 |
||
807 |
void klassItable::oop_update_pointers(ParCompactionManager* cm, |
|
808 |
HeapWord* beg_addr, HeapWord* end_addr) { |
|
809 |
// offset table |
|
810 |
itableOffsetEntry* ioe = offset_entry(0); |
|
811 |
for(int i = 0; i < _size_offset_table; i++) { |
|
812 |
oop* p = (oop*)&ioe->_interface; |
|
813 |
PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
|
814 |
ioe++; |
|
815 |
} |
|
816 |
||
817 |
// method table |
|
818 |
itableMethodEntry* ime = method_entry(0); |
|
819 |
for(int j = 0; j < _size_method_table; j++) { |
|
820 |
oop* p = (oop*)&ime->_method; |
|
821 |
PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
|
822 |
ime++; |
|
823 |
} |
|
824 |
} |
|
825 |
#endif // SERIALGC |
|
826 |
||
827 |
// Iterators |
|
828 |
void klassItable::oop_oop_iterate(OopClosure* blk) { |
|
829 |
// offset table |
|
830 |
itableOffsetEntry* ioe = offset_entry(0); |
|
831 |
for(int i = 0; i < _size_offset_table; i++) { |
|
832 |
blk->do_oop((oop*)&ioe->_interface); |
|
833 |
ioe++; |
|
834 |
} |
|
835 |
||
836 |
// method table |
|
837 |
itableMethodEntry* ime = method_entry(0); |
|
838 |
for(int j = 0; j < _size_method_table; j++) { |
|
839 |
blk->do_oop((oop*)&ime->_method); |
|
840 |
ime++; |
|
841 |
} |
|
842 |
} |
|
843 |
||
844 |
void klassItable::oop_oop_iterate_m(OopClosure* blk, MemRegion mr) { |
|
845 |
// offset table |
|
846 |
itableOffsetEntry* ioe = offset_entry(0); |
|
847 |
for(int i = 0; i < _size_offset_table; i++) { |
|
848 |
oop* adr = (oop*)&ioe->_interface; |
|
849 |
if (mr.contains(adr)) blk->do_oop(adr); |
|
850 |
ioe++; |
|
851 |
} |
|
852 |
||
853 |
// method table |
|
854 |
itableMethodEntry* ime = method_entry(0); |
|
855 |
for(int j = 0; j < _size_method_table; j++) { |
|
856 |
oop* adr = (oop*)&ime->_method; |
|
857 |
if (mr.contains(adr)) blk->do_oop(adr); |
|
858 |
ime++; |
|
859 |
} |
|
860 |
} |
|
861 |
||
862 |
||
863 |
static int initialize_count = 0; |
|
864 |
||
865 |
// Initialization |
|
866 |
void klassItable::initialize_itable(bool checkconstraints, TRAPS) { |
|
189
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|
867 |
// Cannot be setup doing bootstrapping, interfaces don't have |
4248c8e21063
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dcubed
parents:
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diff
changeset
|
868 |
// itables, and klass with only ones entry have empty itables |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
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diff
changeset
|
869 |
if (Universe::is_bootstrapping() || |
4248c8e21063
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dcubed
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diff
changeset
|
870 |
_klass->is_interface() || |
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changeset
|
871 |
_klass->itable_length() == itableOffsetEntry::size()) return; |
1 | 872 |
|
189
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changeset
|
873 |
// There's alway an extra itable entry so we can null-terminate it. |
4248c8e21063
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dcubed
parents:
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diff
changeset
|
874 |
guarantee(size_offset_table() >= 1, "too small"); |
4248c8e21063
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dcubed
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changeset
|
875 |
int num_interfaces = size_offset_table() - 1; |
1 | 876 |
if (num_interfaces > 0) { |
189
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changeset
|
877 |
if (TraceItables) tty->print_cr("%3d: Initializing itables for %s", ++initialize_count, |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
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parents:
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diff
changeset
|
878 |
_klass->name()->as_C_string()); |
1 | 879 |
|
880 |
||
2264
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
881 |
// Iterate through all interfaces |
1 | 882 |
int i; |
883 |
for(i = 0; i < num_interfaces; i++) { |
|
884 |
itableOffsetEntry* ioe = offset_entry(i); |
|
885 |
KlassHandle interf_h (THREAD, ioe->interface_klass()); |
|
886 |
assert(interf_h() != NULL && ioe->offset() != 0, "bad offset entry in itable"); |
|
887 |
initialize_itable_for_interface(ioe->offset(), interf_h, checkconstraints, CHECK); |
|
888 |
} |
|
889 |
||
890 |
} |
|
189
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|
891 |
// Check that the last entry is empty |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
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parents:
1
diff
changeset
|
892 |
itableOffsetEntry* ioe = offset_entry(size_offset_table() - 1); |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
893 |
guarantee(ioe->interface_klass() == NULL && ioe->offset() == 0, "terminator entry missing"); |
1 | 894 |
} |
895 |
||
896 |
||
897 |
void klassItable::initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS) { |
|
898 |
objArrayHandle methods(THREAD, instanceKlass::cast(interf_h())->methods()); |
|
899 |
int nof_methods = methods()->length(); |
|
900 |
HandleMark hm; |
|
901 |
KlassHandle klass = _klass; |
|
5402
c51fd0c1d005
6888953: some calls to function-like macros are missing semicolons
jcoomes
parents:
2343
diff
changeset
|
902 |
assert(nof_methods > 0, "at least one method must exist for interface to be in vtable"); |
1 | 903 |
Handle interface_loader (THREAD, instanceKlass::cast(interf_h())->class_loader()); |
904 |
int ime_num = 0; |
|
905 |
||
906 |
// Skip first methodOop if it is a class initializer |
|
907 |
int i = ((methodOop)methods()->obj_at(0))->name() != vmSymbols::class_initializer_name() ? 0 : 1; |
|
908 |
||
909 |
// m, method_name, method_signature, klass reset each loop so they |
|
910 |
// don't need preserving across check_signature_loaders call |
|
911 |
// methods needs a handle in case of gc from check_signature_loaders |
|
912 |
for(; i < nof_methods; i++) { |
|
913 |
methodOop m = (methodOop)methods()->obj_at(i); |
|
914 |
symbolOop method_name = m->name(); |
|
915 |
symbolOop method_signature = m->signature(); |
|
916 |
||
917 |
// This is same code as in Linkresolver::lookup_instance_method_in_klasses |
|
918 |
methodOop target = klass->uncached_lookup_method(method_name, method_signature); |
|
919 |
while (target != NULL && target->is_static()) { |
|
920 |
// continue with recursive lookup through the superclass |
|
921 |
klassOop super = Klass::cast(target->method_holder())->super(); |
|
922 |
target = (super == NULL) ? methodOop(NULL) : Klass::cast(super)->uncached_lookup_method(method_name, method_signature); |
|
923 |
} |
|
924 |
if (target == NULL || !target->is_public() || target->is_abstract()) { |
|
925 |
// Entry do not resolve. Leave it empty |
|
926 |
} else { |
|
927 |
// Entry did resolve, check loader constraints before initializing |
|
928 |
// if checkconstraints requested |
|
929 |
methodHandle target_h (THREAD, target); // preserve across gc |
|
930 |
if (checkconstraints) { |
|
931 |
Handle method_holder_loader (THREAD, instanceKlass::cast(target->method_holder())->class_loader()); |
|
932 |
if (method_holder_loader() != interface_loader()) { |
|
933 |
ResourceMark rm(THREAD); |
|
934 |
char* failed_type_name = |
|
935 |
SystemDictionary::check_signature_loaders(method_signature, |
|
936 |
method_holder_loader, |
|
937 |
interface_loader, |
|
938 |
true, CHECK); |
|
939 |
if (failed_type_name != NULL) { |
|
940 |
const char* msg = "loader constraint violation in interface " |
|
941 |
"itable initialization: when resolving method \"%s\" the class" |
|
942 |
" loader (instance of %s) of the current class, %s, " |
|
943 |
"and the class loader (instance of %s) for interface " |
|
944 |
"%s have different Class objects for the type %s " |
|
945 |
"used in the signature"; |
|
946 |
char* sig = target_h()->name_and_sig_as_C_string(); |
|
947 |
const char* loader1 = SystemDictionary::loader_name(method_holder_loader()); |
|
948 |
char* current = klass->name()->as_C_string(); |
|
949 |
const char* loader2 = SystemDictionary::loader_name(interface_loader()); |
|
950 |
char* iface = instanceKlass::cast(interf_h())->name()->as_C_string(); |
|
951 |
size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) + |
|
952 |
strlen(current) + strlen(loader2) + strlen(iface) + |
|
953 |
strlen(failed_type_name); |
|
954 |
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen); |
|
955 |
jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2, |
|
956 |
iface, failed_type_name); |
|
957 |
THROW_MSG(vmSymbols::java_lang_LinkageError(), buf); |
|
958 |
} |
|
959 |
} |
|
960 |
} |
|
961 |
||
962 |
// ime may have moved during GC so recalculate address |
|
963 |
itableOffsetEntry::method_entry(_klass(), method_table_offset)[ime_num].initialize(target_h()); |
|
964 |
} |
|
965 |
// Progress to next entry |
|
966 |
ime_num++; |
|
967 |
} |
|
968 |
} |
|
969 |
||
189
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|
970 |
// Update entry for specific methodOop |
1 | 971 |
void klassItable::initialize_with_method(methodOop m) { |
972 |
itableMethodEntry* ime = method_entry(0); |
|
973 |
for(int i = 0; i < _size_method_table; i++) { |
|
974 |
if (ime->method() == m) { |
|
975 |
ime->initialize(m); |
|
976 |
} |
|
977 |
ime++; |
|
978 |
} |
|
979 |
} |
|
980 |
||
981 |
void klassItable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, |
|
982 |
int methods_length, bool * trace_name_printed) { |
|
983 |
// search the itable for uses of either obsolete or EMCP methods |
|
984 |
for (int j = 0; j < methods_length; j++) { |
|
985 |
methodOop old_method = old_methods[j]; |
|
986 |
methodOop new_method = new_methods[j]; |
|
987 |
itableMethodEntry* ime = method_entry(0); |
|
988 |
||
2136
c55428da3cec
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
670
diff
changeset
|
989 |
// The itable can describe more than one interface and the same |
c55428da3cec
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
670
diff
changeset
|
990 |
// method signature can be specified by more than one interface. |
c55428da3cec
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
670
diff
changeset
|
991 |
// This means we have to do an exhaustive search to find all the |
c55428da3cec
6805864: 4/3 Problem with jvmti->redefineClasses: some methods don't get redefined
dcubed
parents:
670
diff
changeset
|
992 |
// old_method references. |
1 | 993 |
for (int i = 0; i < _size_method_table; i++) { |
994 |
if (ime->method() == old_method) { |
|
995 |
ime->initialize(new_method); |
|
996 |
||
997 |
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { |
|
998 |
if (!(*trace_name_printed)) { |
|
999 |
// RC_TRACE_MESG macro has an embedded ResourceMark |
|
1000 |
RC_TRACE_MESG(("adjust: name=%s", |
|
1001 |
Klass::cast(old_method->method_holder())->external_name())); |
|
1002 |
*trace_name_printed = true; |
|
1003 |
} |
|
1004 |
// RC_TRACE macro has an embedded ResourceMark |
|
1005 |
RC_TRACE(0x00200000, ("itable method update: %s(%s)", |
|
1006 |
new_method->name()->as_C_string(), |
|
1007 |
new_method->signature()->as_C_string())); |
|
1008 |
} |
|
2264
55d0115a54fe
4766230: Hotspot vtable inconsistencies cause core dumps. 6579515. 6582242.
acorn
parents:
2136
diff
changeset
|
1009 |
break; |
1 | 1010 |
} |
1011 |
ime++; |
|
1012 |
} |
|
1013 |
} |
|
1014 |
} |
|
1015 |
||
1016 |
||
1017 |
// Setup |
|
1018 |
class InterfaceVisiterClosure : public StackObj { |
|
1019 |
public: |
|
1020 |
virtual void doit(klassOop intf, int method_count) = 0; |
|
1021 |
}; |
|
1022 |
||
1023 |
// Visit all interfaces with at-least one method (excluding <clinit>) |
|
1024 |
void visit_all_interfaces(objArrayOop transitive_intf, InterfaceVisiterClosure *blk) { |
|
1025 |
// Handle array argument |
|
1026 |
for(int i = 0; i < transitive_intf->length(); i++) { |
|
1027 |
klassOop intf = (klassOop)transitive_intf->obj_at(i); |
|
1028 |
assert(Klass::cast(intf)->is_interface(), "sanity check"); |
|
1029 |
||
1030 |
// Find no. of methods excluding a <clinit> |
|
1031 |
int method_count = instanceKlass::cast(intf)->methods()->length(); |
|
1032 |
if (method_count > 0) { |
|
1033 |
methodOop m = (methodOop)instanceKlass::cast(intf)->methods()->obj_at(0); |
|
1034 |
assert(m != NULL && m->is_method(), "sanity check"); |
|
1035 |
if (m->name() == vmSymbols::object_initializer_name()) { |
|
1036 |
method_count--; |
|
1037 |
} |
|
1038 |
} |
|
1039 |
||
1040 |
// Only count interfaces with at least one method |
|
1041 |
if (method_count > 0) { |
|
1042 |
blk->doit(intf, method_count); |
|
1043 |
} |
|
1044 |
} |
|
1045 |
} |
|
1046 |
||
1047 |
class CountInterfacesClosure : public InterfaceVisiterClosure { |
|
1048 |
private: |
|
1049 |
int _nof_methods; |
|
1050 |
int _nof_interfaces; |
|
1051 |
public: |
|
1052 |
CountInterfacesClosure() { _nof_methods = 0; _nof_interfaces = 0; } |
|
1053 |
||
1054 |
int nof_methods() const { return _nof_methods; } |
|
1055 |
int nof_interfaces() const { return _nof_interfaces; } |
|
1056 |
||
1057 |
void doit(klassOop intf, int method_count) { _nof_methods += method_count; _nof_interfaces++; } |
|
1058 |
}; |
|
1059 |
||
1060 |
class SetupItableClosure : public InterfaceVisiterClosure { |
|
1061 |
private: |
|
1062 |
itableOffsetEntry* _offset_entry; |
|
1063 |
itableMethodEntry* _method_entry; |
|
1064 |
address _klass_begin; |
|
1065 |
public: |
|
1066 |
SetupItableClosure(address klass_begin, itableOffsetEntry* offset_entry, itableMethodEntry* method_entry) { |
|
1067 |
_klass_begin = klass_begin; |
|
1068 |
_offset_entry = offset_entry; |
|
1069 |
_method_entry = method_entry; |
|
1070 |
} |
|
1071 |
||
1072 |
itableMethodEntry* method_entry() const { return _method_entry; } |
|
1073 |
||
1074 |
void doit(klassOop intf, int method_count) { |
|
1075 |
int offset = ((address)_method_entry) - _klass_begin; |
|
1076 |
_offset_entry->initialize(intf, offset); |
|
1077 |
_offset_entry++; |
|
1078 |
_method_entry += method_count; |
|
1079 |
} |
|
1080 |
}; |
|
1081 |
||
1082 |
int klassItable::compute_itable_size(objArrayHandle transitive_interfaces) { |
|
1083 |
// Count no of interfaces and total number of interface methods |
|
1084 |
CountInterfacesClosure cic; |
|
1085 |
visit_all_interfaces(transitive_interfaces(), &cic); |
|
1086 |
||
189
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
1087 |
// There's alway an extra itable entry so we can null-terminate it. |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
1088 |
int itable_size = calc_itable_size(cic.nof_interfaces() + 1, cic.nof_methods()); |
1 | 1089 |
|
1090 |
// Statistics |
|
1091 |
update_stats(itable_size * HeapWordSize); |
|
1092 |
||
1093 |
return itable_size; |
|
1094 |
} |
|
1095 |
||
1096 |
||
1097 |
// Fill out offset table and interface klasses into the itable space |
|
1098 |
void klassItable::setup_itable_offset_table(instanceKlassHandle klass) { |
|
1099 |
if (klass->itable_length() == 0) return; |
|
1100 |
assert(!klass->is_interface(), "Should have zero length itable"); |
|
1101 |
||
1102 |
// Count no of interfaces and total number of interface methods |
|
1103 |
CountInterfacesClosure cic; |
|
1104 |
visit_all_interfaces(klass->transitive_interfaces(), &cic); |
|
1105 |
int nof_methods = cic.nof_methods(); |
|
1106 |
int nof_interfaces = cic.nof_interfaces(); |
|
1107 |
||
189
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
1108 |
// Add one extra entry so we can null-terminate the table |
4248c8e21063
6664627: Merge changes made only in hotspot 11 forward to jdk 7
dcubed
parents:
1
diff
changeset
|
1109 |
nof_interfaces++; |
1 | 1110 |
|
1111 |
assert(compute_itable_size(objArrayHandle(klass->transitive_interfaces())) == |
|
1112 |
calc_itable_size(nof_interfaces, nof_methods), |
|
1113 |
"mismatch calculation of itable size"); |
|
1114 |
||
1115 |
// Fill-out offset table |
|
1116 |
itableOffsetEntry* ioe = (itableOffsetEntry*)klass->start_of_itable(); |
|
1117 |
itableMethodEntry* ime = (itableMethodEntry*)(ioe + nof_interfaces); |
|
1118 |
intptr_t* end = klass->end_of_itable(); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
189
diff
changeset
|
1119 |
assert((oop*)(ime + nof_methods) <= (oop*)klass->start_of_static_fields(), "wrong offset calculation (1)"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
189
diff
changeset
|
1120 |
assert((oop*)(end) == (oop*)(ime + nof_methods), "wrong offset calculation (2)"); |
1 | 1121 |
|
1122 |
// Visit all interfaces and initialize itable offset table |
|
1123 |
SetupItableClosure sic((address)klass->as_klassOop(), ioe, ime); |
|
1124 |
visit_all_interfaces(klass->transitive_interfaces(), &sic); |
|
1125 |
||
1126 |
#ifdef ASSERT |
|
1127 |
ime = sic.method_entry(); |
|
1128 |
oop* v = (oop*) klass->end_of_itable(); |
|
1129 |
assert( (oop*)(ime) == v, "wrong offset calculation (2)"); |
|
1130 |
#endif |
|
1131 |
} |
|
1132 |
||
1133 |
||
1134 |
// m must be a method in an interface |
|
1135 |
int klassItable::compute_itable_index(methodOop m) { |
|
1136 |
klassOop intf = m->method_holder(); |
|
1137 |
assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); |
|
1138 |
objArrayOop methods = instanceKlass::cast(intf)->methods(); |
|
1139 |
int index = 0; |
|
1140 |
while(methods->obj_at(index) != m) { |
|
1141 |
index++; |
|
1142 |
assert(index < methods->length(), "should find index for resolve_invoke"); |
|
1143 |
} |
|
1144 |
// Adjust for <clinit>, which is left out of table if first method |
|
1145 |
if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { |
|
1146 |
index--; |
|
1147 |
} |
|
1148 |
return index; |
|
1149 |
} |
|
1150 |
||
2332
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1151 |
|
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1152 |
// inverse to compute_itable_index |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1153 |
methodOop klassItable::method_for_itable_index(klassOop intf, int itable_index) { |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1154 |
assert(instanceKlass::cast(intf)->is_interface(), "sanity check"); |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1155 |
objArrayOop methods = instanceKlass::cast(intf)->methods(); |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1156 |
|
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1157 |
int index = itable_index; |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1158 |
// Adjust for <clinit>, which is left out of table if first method |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1159 |
if (methods->length() > 0 && ((methodOop)methods->obj_at(0))->name() == vmSymbols::class_initializer_name()) { |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1160 |
index++; |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1161 |
} |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1162 |
|
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1163 |
if (itable_index < 0 || index >= methods->length()) |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1164 |
return NULL; // help caller defend against bad indexes |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1165 |
|
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1166 |
methodOop m = (methodOop)methods->obj_at(index); |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1167 |
assert(compute_itable_index(m) == itable_index, "correct inverse"); |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1168 |
|
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1169 |
return m; |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1170 |
} |
5c7b6f4ce0a1
6814659: separable cleanups and subroutines for 6655638
jrose
parents:
2136
diff
changeset
|
1171 |
|
1 | 1172 |
void klassVtable::verify(outputStream* st, bool forced) { |
1173 |
// make sure table is initialized |
|
1174 |
if (!Universe::is_fully_initialized()) return; |
|
1175 |
#ifndef PRODUCT |
|
1176 |
// avoid redundant verifies |
|
1177 |
if (!forced && _verify_count == Universe::verify_count()) return; |
|
1178 |
_verify_count = Universe::verify_count(); |
|
1179 |
#endif |
|
1180 |
oop* end_of_obj = (oop*)_klass() + _klass()->size(); |
|
1181 |
oop* end_of_vtable = (oop *)&table()[_length]; |
|
1182 |
if (end_of_vtable > end_of_obj) { |
|
5403
6b0dd9c75dde
6888954: argument formatting for assert() and friends
jcoomes
parents:
5402
diff
changeset
|
1183 |
fatal(err_msg("klass %s: klass object too short (vtable extends beyond " |
6b0dd9c75dde
6888954: argument formatting for assert() and friends
jcoomes
parents:
5402
diff
changeset
|
1184 |
"end)", _klass->internal_name())); |
1 | 1185 |
} |
1186 |
||
1187 |
for (int i = 0; i < _length; i++) table()[i].verify(this, st); |
|
1188 |
// verify consistency with superKlass vtable |
|
1189 |
klassOop super = _klass->super(); |
|
1190 |
if (super != NULL) { |
|
1191 |
instanceKlass* sk = instanceKlass::cast(super); |
|
1192 |
klassVtable* vt = sk->vtable(); |
|
1193 |
for (int i = 0; i < vt->length(); i++) { |
|
1194 |
verify_against(st, vt, i); |
|
1195 |
} |
|
1196 |
} |
|
1197 |
} |
|
1198 |
||
1199 |
void klassVtable::verify_against(outputStream* st, klassVtable* vt, int index) { |
|
1200 |
vtableEntry* vte = &vt->table()[index]; |
|
1201 |
if (vte->method()->name() != table()[index].method()->name() || |
|
1202 |
vte->method()->signature() != table()[index].method()->signature()) { |
|
1203 |
fatal("mismatched name/signature of vtable entries"); |
|
1204 |
} |
|
1205 |
} |
|
1206 |
||
1207 |
#ifndef PRODUCT |
|
1208 |
void klassVtable::print() { |
|
1209 |
ResourceMark rm; |
|
1210 |
tty->print("klassVtable for klass %s (length %d):\n", _klass->internal_name(), length()); |
|
1211 |
for (int i = 0; i < length(); i++) { |
|
1212 |
table()[i].print(); |
|
1213 |
tty->cr(); |
|
1214 |
} |
|
1215 |
} |
|
1216 |
#endif |
|
1217 |
||
1218 |
void vtableEntry::verify(klassVtable* vt, outputStream* st) { |
|
1219 |
NOT_PRODUCT(FlagSetting fs(IgnoreLockingAssertions, true)); |
|
1220 |
assert(method() != NULL, "must have set method"); |
|
1221 |
method()->verify(); |
|
1222 |
// we sub_type, because it could be a miranda method |
|
1223 |
if (!vt->klass()->is_subtype_of(method()->method_holder())) { |
|
1224 |
#ifndef PRODUCT |
|
1225 |
print(); |
|
1226 |
#endif |
|
5403
6b0dd9c75dde
6888954: argument formatting for assert() and friends
jcoomes
parents:
5402
diff
changeset
|
1227 |
fatal(err_msg("vtableEntry " PTR_FORMAT ": method is from subclass", this)); |
1 | 1228 |
} |
1229 |
} |
|
1230 |
||
1231 |
#ifndef PRODUCT |
|
1232 |
||
1233 |
void vtableEntry::print() { |
|
1234 |
ResourceMark rm; |
|
1235 |
tty->print("vtableEntry %s: ", method()->name()->as_C_string()); |
|
1236 |
if (Verbose) { |
|
1237 |
tty->print("m %#lx ", (address)method()); |
|
1238 |
} |
|
1239 |
} |
|
1240 |
||
1241 |
class VtableStats : AllStatic { |
|
1242 |
public: |
|
1243 |
static int no_klasses; // # classes with vtables |
|
1244 |
static int no_array_klasses; // # array classes |
|
1245 |
static int no_instance_klasses; // # instanceKlasses |
|
1246 |
static int sum_of_vtable_len; // total # of vtable entries |
|
1247 |
static int sum_of_array_vtable_len; // total # of vtable entries in array klasses only |
|
1248 |
static int fixed; // total fixed overhead in bytes |
|
1249 |
static int filler; // overhead caused by filler bytes |
|
1250 |
static int entries; // total bytes consumed by vtable entries |
|
1251 |
static int array_entries; // total bytes consumed by array vtable entries |
|
1252 |
||
1253 |
static void do_class(klassOop k) { |
|
1254 |
Klass* kl = k->klass_part(); |
|
1255 |
klassVtable* vt = kl->vtable(); |
|
1256 |
if (vt == NULL) return; |
|
1257 |
no_klasses++; |
|
1258 |
if (kl->oop_is_instance()) { |
|
1259 |
no_instance_klasses++; |
|
1260 |
kl->array_klasses_do(do_class); |
|
1261 |
} |
|
1262 |
if (kl->oop_is_array()) { |
|
1263 |
no_array_klasses++; |
|
1264 |
sum_of_array_vtable_len += vt->length(); |
|
1265 |
} |
|
1266 |
sum_of_vtable_len += vt->length(); |
|
1267 |
} |
|
1268 |
||
1269 |
static void compute() { |
|
1270 |
SystemDictionary::classes_do(do_class); |
|
1271 |
fixed = no_klasses * oopSize; // vtable length |
|
1272 |
// filler size is a conservative approximation |
|
1273 |
filler = oopSize * (no_klasses - no_instance_klasses) * (sizeof(instanceKlass) - sizeof(arrayKlass) - 1); |
|
1274 |
entries = sizeof(vtableEntry) * sum_of_vtable_len; |
|
1275 |
array_entries = sizeof(vtableEntry) * sum_of_array_vtable_len; |
|
1276 |
} |
|
1277 |
}; |
|
1278 |
||
1279 |
int VtableStats::no_klasses = 0; |
|
1280 |
int VtableStats::no_array_klasses = 0; |
|
1281 |
int VtableStats::no_instance_klasses = 0; |
|
1282 |
int VtableStats::sum_of_vtable_len = 0; |
|
1283 |
int VtableStats::sum_of_array_vtable_len = 0; |
|
1284 |
int VtableStats::fixed = 0; |
|
1285 |
int VtableStats::filler = 0; |
|
1286 |
int VtableStats::entries = 0; |
|
1287 |
int VtableStats::array_entries = 0; |
|
1288 |
||
1289 |
void klassVtable::print_statistics() { |
|
1290 |
ResourceMark rm; |
|
1291 |
HandleMark hm; |
|
1292 |
VtableStats::compute(); |
|
1293 |
tty->print_cr("vtable statistics:"); |
|
1294 |
tty->print_cr("%6d classes (%d instance, %d array)", VtableStats::no_klasses, VtableStats::no_instance_klasses, VtableStats::no_array_klasses); |
|
1295 |
int total = VtableStats::fixed + VtableStats::filler + VtableStats::entries; |
|
1296 |
tty->print_cr("%6d bytes fixed overhead (refs + vtable object header)", VtableStats::fixed); |
|
1297 |
tty->print_cr("%6d bytes filler overhead", VtableStats::filler); |
|
1298 |
tty->print_cr("%6d bytes for vtable entries (%d for arrays)", VtableStats::entries, VtableStats::array_entries); |
|
1299 |
tty->print_cr("%6d bytes total", total); |
|
1300 |
} |
|
1301 |
||
1302 |
bool klassVtable::check_no_old_entries() { |
|
1303 |
// Check that there really is no entry |
|
1304 |
for (int i = 0; i < length(); i++) { |
|
1305 |
methodOop m = unchecked_method_at(i); |
|
1306 |
if (m != NULL) { |
|
1307 |
if (m->is_old()) { |
|
1308 |
return false; |
|
1309 |
} |
|
1310 |
} |
|
1311 |
} |
|
1312 |
return true; |
|
1313 |
} |
|
1314 |
||
1315 |
void klassVtable::dump_vtable() { |
|
1316 |
tty->print_cr("vtable dump --"); |
|
1317 |
for (int i = 0; i < length(); i++) { |
|
1318 |
methodOop m = unchecked_method_at(i); |
|
1319 |
if (m != NULL) { |
|
1320 |
tty->print(" (%5d) ", i); |
|
1321 |
m->access_flags().print_on(tty); |
|
1322 |
tty->print(" -- "); |
|
1323 |
m->print_name(tty); |
|
1324 |
tty->cr(); |
|
1325 |
} |
|
1326 |
} |
|
1327 |
} |
|
1328 |
||
1329 |
int klassItable::_total_classes; // Total no. of classes with itables |
|
1330 |
long klassItable::_total_size; // Total no. of bytes used for itables |
|
1331 |
||
1332 |
void klassItable::print_statistics() { |
|
1333 |
tty->print_cr("itable statistics:"); |
|
1334 |
tty->print_cr("%6d classes with itables", _total_classes); |
|
1335 |
tty->print_cr("%6d K uses for itables (average by class: %d bytes)", _total_size / K, _total_size / _total_classes); |
|
1336 |
} |
|
1337 |
||
1338 |
#endif // PRODUCT |