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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_klass.cpp.incl"
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bool Klass::is_subclass_of(klassOop k) const {
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// Run up the super chain and check
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klassOop t = as_klassOop();
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if (t == k) return true;
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t = Klass::cast(t)->super();
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while (t != NULL) {
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if (t == k) return true;
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t = Klass::cast(t)->super();
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}
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return false;
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}
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bool Klass::search_secondary_supers(klassOop k) const {
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// Put some extra logic here out-of-line, before the search proper.
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// This cuts down the size of the inline method.
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// This is necessary, since I am never in my own secondary_super list.
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if (this->as_klassOop() == k)
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return true;
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// Scan the array-of-objects for a match
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int cnt = secondary_supers()->length();
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for (int i = 0; i < cnt; i++) {
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if (secondary_supers()->obj_at(i) == k) {
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((Klass*)this)->set_secondary_super_cache(k);
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return true;
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}
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}
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return false;
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}
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// Return self, except for abstract classes with exactly 1
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// implementor. Then return the 1 concrete implementation.
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Klass *Klass::up_cast_abstract() {
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Klass *r = this;
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while( r->is_abstract() ) { // Receiver is abstract?
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Klass *s = r->subklass(); // Check for exactly 1 subklass
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if( !s || s->next_sibling() ) // Oops; wrong count; give up
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return this; // Return 'this' as a no-progress flag
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r = s; // Loop till find concrete class
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}
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return r; // Return the 1 concrete class
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}
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// Find LCA in class heirarchy
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Klass *Klass::LCA( Klass *k2 ) {
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Klass *k1 = this;
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while( 1 ) {
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if( k1->is_subtype_of(k2->as_klassOop()) ) return k2;
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if( k2->is_subtype_of(k1->as_klassOop()) ) return k1;
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k1 = k1->super()->klass_part();
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k2 = k2->super()->klass_part();
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}
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}
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void Klass::check_valid_for_instantiation(bool throwError, TRAPS) {
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ResourceMark rm(THREAD);
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THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
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: vmSymbols::java_lang_InstantiationException(), external_name());
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}
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void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
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THROW(vmSymbols::java_lang_ArrayStoreException());
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}
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void Klass::initialize(TRAPS) {
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ShouldNotReachHere();
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}
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bool Klass::compute_is_subtype_of(klassOop k) {
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assert(k->is_klass(), "argument must be a class");
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return is_subclass_of(k);
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}
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methodOop Klass::uncached_lookup_method(symbolOop name, symbolOop signature) const {
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#ifdef ASSERT
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tty->print_cr("Error: uncached_lookup_method called on a klass oop."
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" Likely error: reflection method does not correctly"
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" wrap return value in a mirror object.");
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#endif
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ShouldNotReachHere();
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return NULL;
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}
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klassOop Klass::base_create_klass_oop(KlassHandle& klass, int size,
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const Klass_vtbl& vtbl, TRAPS) {
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size = align_object_size(size);
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// allocate and initialize vtable
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Klass* kl = (Klass*) vtbl.allocate_permanent(klass, size, CHECK_NULL);
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klassOop k = kl->as_klassOop();
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{ // Preinitialize supertype information.
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// A later call to initialize_supers() may update these settings:
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kl->set_super(NULL);
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for (juint i = 0; i < Klass::primary_super_limit(); i++) {
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kl->_primary_supers[i] = NULL;
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}
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kl->set_secondary_supers(NULL);
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oop_store_without_check((oop*) &kl->_primary_supers[0], k);
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kl->set_super_check_offset(primary_supers_offset_in_bytes() + sizeof(oopDesc));
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}
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kl->set_java_mirror(NULL);
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kl->set_modifier_flags(0);
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kl->set_layout_helper(Klass::_lh_neutral_value);
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kl->set_name(NULL);
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AccessFlags af;
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af.set_flags(0);
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kl->set_access_flags(af);
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kl->set_subklass(NULL);
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kl->set_next_sibling(NULL);
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kl->set_alloc_count(0);
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kl->set_alloc_size(0);
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kl->set_prototype_header(markOopDesc::prototype());
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kl->set_biased_lock_revocation_count(0);
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kl->set_last_biased_lock_bulk_revocation_time(0);
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return k;
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}
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KlassHandle Klass::base_create_klass(KlassHandle& klass, int size,
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const Klass_vtbl& vtbl, TRAPS) {
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klassOop ek = base_create_klass_oop(klass, size, vtbl, THREAD);
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return KlassHandle(THREAD, ek);
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}
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void Klass_vtbl::post_new_init_klass(KlassHandle& klass,
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klassOop new_klass,
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int size) const {
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assert(!new_klass->klass_part()->null_vtbl(), "Not a complete klass");
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CollectedHeap::post_allocation_install_obj_klass(klass, new_klass, size);
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}
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void* Klass_vtbl::operator new(size_t ignored, KlassHandle& klass,
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int size, TRAPS) {
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// The vtable pointer is installed during the execution of
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// constructors in the call to permanent_obj_allocate(). Delay
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// the installation of the klass pointer into the new klass "k"
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// until after the vtable pointer has been installed (i.e., until
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// after the return of permanent_obj_allocate().
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klassOop k =
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(klassOop) CollectedHeap::permanent_obj_allocate_no_klass_install(klass,
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size, CHECK_NULL);
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return k->klass_part();
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}
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jint Klass::array_layout_helper(BasicType etype) {
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assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
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// Note that T_ARRAY is not allowed here.
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int hsize = arrayOopDesc::base_offset_in_bytes(etype);
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int esize = type2aelembytes[etype];
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bool isobj = (etype == T_OBJECT);
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int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
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int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
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assert(lh < (int)_lh_neutral_value, "must look like an array layout");
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assert(layout_helper_is_javaArray(lh), "correct kind");
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assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
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assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
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assert(layout_helper_header_size(lh) == hsize, "correct decode");
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assert(layout_helper_element_type(lh) == etype, "correct decode");
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assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
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return lh;
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}
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bool Klass::can_be_primary_super_slow() const {
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if (super() == NULL)
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return true;
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else if (super()->klass_part()->super_depth() >= primary_super_limit()-1)
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return false;
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else
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return true;
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}
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void Klass::initialize_supers(klassOop k, TRAPS) {
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if (FastSuperclassLimit == 0) {
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// None of the other machinery matters.
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set_super(k);
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return;
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}
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if (k == NULL) {
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set_super(NULL);
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oop_store_without_check((oop*) &_primary_supers[0], (oop) this->as_klassOop());
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assert(super_depth() == 0, "Object must already be initialized properly");
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} else if (k != super() || k == SystemDictionary::object_klass()) {
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assert(super() == NULL || super() == SystemDictionary::object_klass(),
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"initialize this only once to a non-trivial value");
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set_super(k);
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Klass* sup = k->klass_part();
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int sup_depth = sup->super_depth();
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juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit());
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if (!can_be_primary_super_slow())
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my_depth = primary_super_limit();
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for (juint i = 0; i < my_depth; i++) {
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oop_store_without_check((oop*) &_primary_supers[i], (oop) sup->_primary_supers[i]);
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}
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klassOop *super_check_cell;
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if (my_depth < primary_super_limit()) {
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oop_store_without_check((oop*) &_primary_supers[my_depth], (oop) this->as_klassOop());
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super_check_cell = &_primary_supers[my_depth];
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} else {
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// Overflow of the primary_supers array forces me to be secondary.
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super_check_cell = &_secondary_super_cache;
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}
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set_super_check_offset((address)super_check_cell - (address) this->as_klassOop());
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#ifdef ASSERT
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{
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juint j = super_depth();
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assert(j == my_depth, "computed accessor gets right answer");
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klassOop t = as_klassOop();
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while (!Klass::cast(t)->can_be_primary_super()) {
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t = Klass::cast(t)->super();
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j = Klass::cast(t)->super_depth();
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}
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for (juint j1 = j+1; j1 < primary_super_limit(); j1++) {
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assert(primary_super_of_depth(j1) == NULL, "super list padding");
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}
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while (t != NULL) {
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assert(primary_super_of_depth(j) == t, "super list initialization");
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t = Klass::cast(t)->super();
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--j;
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}
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assert(j == (juint)-1, "correct depth count");
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}
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#endif
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}
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if (secondary_supers() == NULL) {
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KlassHandle this_kh (THREAD, this);
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// Now compute the list of secondary supertypes.
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// Secondaries can occasionally be on the super chain,
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// if the inline "_primary_supers" array overflows.
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int extras = 0;
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klassOop p;
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for (p = super(); !(p == NULL || p->klass_part()->can_be_primary_super()); p = p->klass_part()->super()) {
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++extras;
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}
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// Compute the "real" non-extra secondaries.
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objArrayOop secondary_oops = compute_secondary_supers(extras, CHECK);
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objArrayHandle secondaries (THREAD, secondary_oops);
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// Store the extra secondaries in the first array positions:
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int fillp = extras;
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for (p = this_kh->super(); !(p == NULL || p->klass_part()->can_be_primary_super()); p = p->klass_part()->super()) {
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int i; // Scan for overflow primaries being duplicates of 2nd'arys
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// This happens frequently for very deeply nested arrays: the
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// primary superclass chain overflows into the secondary. The
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// secondary list contains the element_klass's secondaries with
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// an extra array dimension added. If the element_klass's
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// secondary list already contains some primary overflows, they
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// (with the extra level of array-ness) will collide with the
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// normal primary superclass overflows.
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for( i = extras; i < secondaries->length(); i++ )
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if( secondaries->obj_at(i) == p )
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break;
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if( i < secondaries->length() )
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continue; // It's a dup, don't put it in
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secondaries->obj_at_put(--fillp, p);
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}
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// See if we had some dup's, so the array has holes in it.
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if( fillp > 0 ) {
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// Pack the array. Drop the old secondaries array on the floor
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// and let GC reclaim it.
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objArrayOop s2 = oopFactory::new_system_objArray(secondaries->length() - fillp, CHECK);
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for( int i = 0; i < s2->length(); i++ )
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s2->obj_at_put( i, secondaries->obj_at(i+fillp) );
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secondaries = objArrayHandle(THREAD, s2);
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}
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#ifdef ASSERT
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if (secondaries() != Universe::the_array_interfaces_array()) {
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// We must not copy any NULL placeholders left over from bootstrap.
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for (int j = 0; j < secondaries->length(); j++) {
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assert(secondaries->obj_at(j) != NULL, "correct bootstrapping order");
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}
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}
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#endif
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this_kh->set_secondary_supers(secondaries());
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}
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}
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objArrayOop Klass::compute_secondary_supers(int num_extra_slots, TRAPS) {
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assert(num_extra_slots == 0, "override for complex klasses");
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return Universe::the_empty_system_obj_array();
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}
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Klass* Klass::subklass() const {
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return _subklass == NULL ? NULL : Klass::cast(_subklass);
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}
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instanceKlass* Klass::superklass() const {
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assert(super() == NULL || super()->klass_part()->oop_is_instance(), "must be instance klass");
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return _super == NULL ? NULL : instanceKlass::cast(_super);
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}
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Klass* Klass::next_sibling() const {
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return _next_sibling == NULL ? NULL : Klass::cast(_next_sibling);
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}
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void Klass::set_subklass(klassOop s) {
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assert(s != as_klassOop(), "sanity check");
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oop_store_without_check((oop*)&_subklass, s);
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}
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void Klass::set_next_sibling(klassOop s) {
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assert(s != as_klassOop(), "sanity check");
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oop_store_without_check((oop*)&_next_sibling, s);
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}
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void Klass::append_to_sibling_list() {
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debug_only(if (!SharedSkipVerify) as_klassOop()->verify();)
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// add ourselves to superklass' subklass list
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instanceKlass* super = superklass();
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if (super == NULL) return; // special case: class Object
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assert(SharedSkipVerify ||
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(!super->is_interface() // interfaces cannot be supers
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&& (super->superklass() == NULL || !is_interface())),
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"an interface can only be a subklass of Object");
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klassOop prev_first_subklass = super->subklass_oop();
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if (prev_first_subklass != NULL) {
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// set our sibling to be the superklass' previous first subklass
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set_next_sibling(prev_first_subklass);
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}
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// make ourselves the superklass' first subklass
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super->set_subklass(as_klassOop());
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debug_only(if (!SharedSkipVerify) as_klassOop()->verify();)
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}
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void Klass::remove_from_sibling_list() {
|
|
371 |
// remove receiver from sibling list
|
|
372 |
instanceKlass* super = superklass();
|
|
373 |
assert(super != NULL || as_klassOop() == SystemDictionary::object_klass(), "should have super");
|
|
374 |
if (super == NULL) return; // special case: class Object
|
|
375 |
if (super->subklass() == this) {
|
|
376 |
// first subklass
|
|
377 |
super->set_subklass(_next_sibling);
|
|
378 |
} else {
|
|
379 |
Klass* sib = super->subklass();
|
|
380 |
while (sib->next_sibling() != this) {
|
|
381 |
sib = sib->next_sibling();
|
|
382 |
};
|
|
383 |
sib->set_next_sibling(_next_sibling);
|
|
384 |
}
|
|
385 |
}
|
|
386 |
|
|
387 |
void Klass::follow_weak_klass_links( BoolObjectClosure* is_alive, OopClosure* keep_alive) {
|
|
388 |
// This klass is alive but the subklass and siblings are not followed/updated.
|
|
389 |
// We update the subklass link and the subklass' sibling links here.
|
|
390 |
// Our own sibling link will be updated by our superclass (which must be alive
|
|
391 |
// since we are).
|
|
392 |
assert(is_alive->do_object_b(as_klassOop()), "just checking, this should be live");
|
|
393 |
if (ClassUnloading) {
|
|
394 |
klassOop sub = subklass_oop();
|
|
395 |
if (sub != NULL && !is_alive->do_object_b(sub)) {
|
|
396 |
// first subklass not alive, find first one alive
|
|
397 |
do {
|
|
398 |
#ifndef PRODUCT
|
|
399 |
if (TraceClassUnloading && WizardMode) {
|
|
400 |
ResourceMark rm;
|
|
401 |
tty->print_cr("[Unlinking class (subclass) %s]", sub->klass_part()->external_name());
|
|
402 |
}
|
|
403 |
#endif
|
|
404 |
sub = sub->klass_part()->next_sibling_oop();
|
|
405 |
} while (sub != NULL && !is_alive->do_object_b(sub));
|
|
406 |
set_subklass(sub);
|
|
407 |
}
|
|
408 |
// now update the subklass' sibling list
|
|
409 |
while (sub != NULL) {
|
|
410 |
klassOop next = sub->klass_part()->next_sibling_oop();
|
|
411 |
if (next != NULL && !is_alive->do_object_b(next)) {
|
|
412 |
// first sibling not alive, find first one alive
|
|
413 |
do {
|
|
414 |
#ifndef PRODUCT
|
|
415 |
if (TraceClassUnloading && WizardMode) {
|
|
416 |
ResourceMark rm;
|
|
417 |
tty->print_cr("[Unlinking class (sibling) %s]", next->klass_part()->external_name());
|
|
418 |
}
|
|
419 |
#endif
|
|
420 |
next = next->klass_part()->next_sibling_oop();
|
|
421 |
} while (next != NULL && !is_alive->do_object_b(next));
|
|
422 |
sub->klass_part()->set_next_sibling(next);
|
|
423 |
}
|
|
424 |
sub = next;
|
|
425 |
}
|
|
426 |
} else {
|
|
427 |
// Always follow subklass and sibling link. This will prevent any klasses from
|
|
428 |
// being unloaded (all classes are transitively linked from java.lang.Object).
|
|
429 |
keep_alive->do_oop(adr_subklass());
|
|
430 |
keep_alive->do_oop(adr_next_sibling());
|
|
431 |
}
|
|
432 |
}
|
|
433 |
|
|
434 |
|
|
435 |
void Klass::remove_unshareable_info() {
|
|
436 |
if (oop_is_instance()) {
|
|
437 |
instanceKlass* ik = (instanceKlass*)this;
|
|
438 |
if (ik->is_linked()) {
|
|
439 |
ik->unlink_class();
|
|
440 |
}
|
|
441 |
}
|
|
442 |
set_subklass(NULL);
|
|
443 |
set_next_sibling(NULL);
|
|
444 |
}
|
|
445 |
|
|
446 |
|
|
447 |
klassOop Klass::array_klass_or_null(int rank) {
|
|
448 |
EXCEPTION_MARK;
|
|
449 |
// No exception can be thrown by array_klass_impl when called with or_null == true.
|
|
450 |
// (In anycase, the execption mark will fail if it do so)
|
|
451 |
return array_klass_impl(true, rank, THREAD);
|
|
452 |
}
|
|
453 |
|
|
454 |
|
|
455 |
klassOop Klass::array_klass_or_null() {
|
|
456 |
EXCEPTION_MARK;
|
|
457 |
// No exception can be thrown by array_klass_impl when called with or_null == true.
|
|
458 |
// (In anycase, the execption mark will fail if it do so)
|
|
459 |
return array_klass_impl(true, THREAD);
|
|
460 |
}
|
|
461 |
|
|
462 |
|
|
463 |
klassOop Klass::array_klass_impl(bool or_null, int rank, TRAPS) {
|
|
464 |
fatal("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass");
|
|
465 |
return NULL;
|
|
466 |
}
|
|
467 |
|
|
468 |
|
|
469 |
klassOop Klass::array_klass_impl(bool or_null, TRAPS) {
|
|
470 |
fatal("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass");
|
|
471 |
return NULL;
|
|
472 |
}
|
|
473 |
|
|
474 |
|
|
475 |
void Klass::with_array_klasses_do(void f(klassOop k)) {
|
|
476 |
f(as_klassOop());
|
|
477 |
}
|
|
478 |
|
|
479 |
|
|
480 |
const char* Klass::external_name() const {
|
|
481 |
return name()->as_klass_external_name();
|
|
482 |
}
|
|
483 |
|
|
484 |
|
|
485 |
char* Klass::signature_name() const {
|
|
486 |
return name()->as_C_string();
|
|
487 |
}
|
|
488 |
|
|
489 |
// Unless overridden, modifier_flags is 0.
|
|
490 |
jint Klass::compute_modifier_flags(TRAPS) const {
|
|
491 |
return 0;
|
|
492 |
}
|
|
493 |
|
|
494 |
int Klass::atomic_incr_biased_lock_revocation_count() {
|
|
495 |
return (int) Atomic::add(1, &_biased_lock_revocation_count);
|
|
496 |
}
|
|
497 |
|
|
498 |
// Unless overridden, jvmti_class_status has no flags set.
|
|
499 |
jint Klass::jvmti_class_status() const {
|
|
500 |
return 0;
|
|
501 |
}
|
|
502 |
|
|
503 |
#ifndef PRODUCT
|
|
504 |
|
|
505 |
// Printing
|
|
506 |
|
|
507 |
void Klass::oop_print_on(oop obj, outputStream* st) {
|
|
508 |
ResourceMark rm;
|
|
509 |
// print title
|
|
510 |
st->print_cr("%s ", internal_name());
|
|
511 |
obj->print_address_on(st);
|
|
512 |
|
|
513 |
if (WizardMode) {
|
|
514 |
// print header
|
|
515 |
obj->mark()->print_on(st);
|
|
516 |
}
|
|
517 |
|
|
518 |
// print class
|
|
519 |
st->print(" - klass: ");
|
|
520 |
obj->klass()->print_value_on(st);
|
|
521 |
st->cr();
|
|
522 |
}
|
|
523 |
|
|
524 |
|
|
525 |
void Klass::oop_print_value_on(oop obj, outputStream* st) {
|
|
526 |
// print title
|
|
527 |
ResourceMark rm; // Cannot print in debug mode without this
|
|
528 |
st->print("%s", internal_name());
|
|
529 |
obj->print_address_on(st);
|
|
530 |
}
|
|
531 |
|
|
532 |
#endif
|
|
533 |
|
|
534 |
// Verification
|
|
535 |
|
|
536 |
void Klass::oop_verify_on(oop obj, outputStream* st) {
|
|
537 |
guarantee(obj->is_oop(), "should be oop");
|
|
538 |
guarantee(obj->klass()->is_perm(), "should be in permspace");
|
|
539 |
guarantee(obj->klass()->is_klass(), "klass field is not a klass");
|
|
540 |
}
|
|
541 |
|
|
542 |
|
|
543 |
void Klass::oop_verify_old_oop(oop obj, oop* p, bool allow_dirty) {
|
|
544 |
/* $$$ I think this functionality should be handled by verification of
|
|
545 |
|
|
546 |
RememberedSet::verify_old_oop(obj, p, allow_dirty, false);
|
|
547 |
|
|
548 |
the card table. */
|
|
549 |
}
|
|
550 |
|
|
551 |
#ifndef PRODUCT
|
|
552 |
|
|
553 |
void Klass::verify_vtable_index(int i) {
|
|
554 |
assert(oop_is_instance() || oop_is_array(), "only instanceKlass and arrayKlass have vtables");
|
|
555 |
if (oop_is_instance()) {
|
|
556 |
assert(i>=0 && i<((instanceKlass*)this)->vtable_length()/vtableEntry::size(), "index out of bounds");
|
|
557 |
} else {
|
|
558 |
assert(i>=0 && i<((arrayKlass*)this)->vtable_length()/vtableEntry::size(), "index out of bounds");
|
|
559 |
}
|
|
560 |
}
|
|
561 |
|
|
562 |
#endif
|