245 lines
7.7 KiB
C++
245 lines
7.7 KiB
C++
/*
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* Copyright (c) 1999, 2011, 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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#include "precompiled.hpp"
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#include "ci/ciKlass.hpp"
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#include "ci/ciSymbol.hpp"
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#include "ci/ciUtilities.hpp"
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#include "oops/oop.inline.hpp"
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// ciKlass
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//
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// This class represents a klassOop in the HotSpot virtual
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// machine.
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// ------------------------------------------------------------------
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// ciKlass::ciKlass
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ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
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assert(get_oop()->is_klass(), "wrong type");
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Klass* k = get_Klass();
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_layout_helper = k->layout_helper();
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Symbol* klass_name = k->name();
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assert(klass_name != NULL, "wrong ciKlass constructor");
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_name = CURRENT_ENV->get_symbol(klass_name);
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}
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// ------------------------------------------------------------------
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// ciKlass::ciKlass
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//
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// Nameless klass variant.
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ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
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assert(get_oop()->is_klass(), "wrong type");
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_name = name;
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_layout_helper = Klass::_lh_neutral_value;
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}
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// ------------------------------------------------------------------
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// ciKlass::ciKlass
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//
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// Unloaded klass variant.
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ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) {
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_name = name;
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_layout_helper = Klass::_lh_neutral_value;
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}
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// ------------------------------------------------------------------
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// ciKlass::is_subtype_of
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bool ciKlass::is_subtype_of(ciKlass* that) {
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assert(is_loaded() && that->is_loaded(), "must be loaded");
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assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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// Check to see if the klasses are identical.
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if (this == that) {
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return true;
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}
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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klassOop that_klass = that->get_klassOop();
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bool result = this_klass->is_subtype_of(that_klass);
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return result;
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}
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// ------------------------------------------------------------------
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// ciKlass::is_subclass_of
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bool ciKlass::is_subclass_of(ciKlass* that) {
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assert(is_loaded() && that->is_loaded(), "must be loaded");
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assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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// Check to see if the klasses are identical.
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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klassOop that_klass = that->get_klassOop();
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bool result = this_klass->is_subclass_of(that_klass);
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return result;
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}
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// ------------------------------------------------------------------
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// ciKlass::super_depth
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juint ciKlass::super_depth() {
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assert(is_loaded(), "must be loaded");
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assert(is_java_klass(), "must be java klasses");
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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return this_klass->super_depth();
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}
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// ------------------------------------------------------------------
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// ciKlass::super_check_offset
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juint ciKlass::super_check_offset() {
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assert(is_loaded(), "must be loaded");
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assert(is_java_klass(), "must be java klasses");
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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return this_klass->super_check_offset();
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}
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// ------------------------------------------------------------------
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// ciKlass::super_of_depth
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ciKlass* ciKlass::super_of_depth(juint i) {
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assert(is_loaded(), "must be loaded");
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assert(is_java_klass(), "must be java klasses");
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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klassOop super = this_klass->primary_super_of_depth(i);
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return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL;
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}
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// ------------------------------------------------------------------
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// ciKlass::can_be_primary_super
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bool ciKlass::can_be_primary_super() {
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assert(is_loaded(), "must be loaded");
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assert(is_java_klass(), "must be java klasses");
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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return this_klass->can_be_primary_super();
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}
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// ------------------------------------------------------------------
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// ciKlass::least_common_ancestor
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//
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// Get the shared parent of two klasses.
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//
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// Implementation note: this method currently goes "over the wall"
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// and does all of the work on the VM side. It could be rewritten
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// to use the super() method and do all of the work (aside from the
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// lazy computation of super()) in native mode. This may be
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// worthwhile if the compiler is repeatedly requesting the same lca
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// computation or possibly if most of the superklasses have already
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// been created as ciObjects anyway. Something to think about...
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ciKlass*
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ciKlass::least_common_ancestor(ciKlass* that) {
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assert(is_loaded() && that->is_loaded(), "must be loaded");
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assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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// Check to see if the klasses are identical.
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if (this == that) {
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return this;
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}
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VM_ENTRY_MARK;
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Klass* this_klass = get_Klass();
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Klass* that_klass = that->get_Klass();
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Klass* lca = this_klass->LCA(that_klass);
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// Many times the LCA will be either this_klass or that_klass.
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// Treat these as special cases.
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if (lca == that_klass) {
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return that;
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}
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if (this_klass == lca) {
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return this;
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}
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// Create the ciInstanceKlass for the lca.
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ciKlass* result =
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CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass();
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return result;
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}
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// ------------------------------------------------------------------
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// ciKlass::find_klass
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//
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// Find a klass using this klass's class loader.
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ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
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assert(is_loaded(), "cannot find_klass through an unloaded klass");
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return CURRENT_ENV->get_klass_by_name(this,
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klass_name, false);
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}
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// ------------------------------------------------------------------
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// ciKlass::java_mirror
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//
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// Get the instance of java.lang.Class corresponding to this klass.
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// If it is an unloaded instance or array klass, return an unloaded
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// mirror object of type Class.
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ciInstance* ciKlass::java_mirror() {
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GUARDED_VM_ENTRY(
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if (!is_loaded())
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return ciEnv::current()->get_unloaded_klass_mirror(this);
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oop java_mirror = get_Klass()->java_mirror();
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return CURRENT_ENV->get_object(java_mirror)->as_instance();
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)
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}
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// ------------------------------------------------------------------
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// ciKlass::modifier_flags
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jint ciKlass::modifier_flags() {
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assert(is_loaded(), "not loaded");
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GUARDED_VM_ENTRY(
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return get_Klass()->modifier_flags();
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)
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}
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// ------------------------------------------------------------------
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// ciKlass::access_flags
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jint ciKlass::access_flags() {
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assert(is_loaded(), "not loaded");
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GUARDED_VM_ENTRY(
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return get_Klass()->access_flags().as_int();
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)
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}
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// ------------------------------------------------------------------
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// ciKlass::print_impl
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//
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// Implementation of the print method
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void ciKlass::print_impl(outputStream* st) {
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st->print(" name=");
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print_name_on(st);
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}
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// ------------------------------------------------------------------
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// ciKlass::print_name
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//
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// Print the name of this klass
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void ciKlass::print_name_on(outputStream* st) {
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name()->print_symbol_on(st);
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}
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