aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "ci/ciKlass.hpp"
aoqi@0: #include "ci/ciSymbol.hpp"
aoqi@0: #include "ci/ciUtilities.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: 
aoqi@0: // ciKlass
aoqi@0: //
aoqi@0: // This class represents a Klass* in the HotSpot virtual
aoqi@0: // machine.
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::ciKlass
aoqi@0: ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
aoqi@0:   assert(get_Klass()->is_klass(), "wrong type");
aoqi@0:   Klass* k = get_Klass();
aoqi@0:   _layout_helper = k->layout_helper();
aoqi@0:   Symbol* klass_name = k->name();
aoqi@0:   assert(klass_name != NULL, "wrong ciKlass constructor");
aoqi@0:   _name = CURRENT_ENV->get_symbol(klass_name);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::ciKlass
aoqi@0: //
aoqi@0: // Nameless klass variant.
aoqi@0: ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
aoqi@0:   assert(get_Klass()->is_klass(), "wrong type");
aoqi@0:   _name = name;
aoqi@0:   _layout_helper = Klass::_lh_neutral_value;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::ciKlass
aoqi@0: //
aoqi@0: // Unloaded klass variant.
aoqi@0: ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) {
aoqi@0:   _name = name;
aoqi@0:   _layout_helper = Klass::_lh_neutral_value;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::is_subtype_of
aoqi@0: bool ciKlass::is_subtype_of(ciKlass* that) {
aoqi@0:   assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
aoqi@0:   assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
aoqi@0: 
aoqi@0:   // Check to see if the klasses are identical.
aoqi@0:   if (this == that) {
aoqi@0:     return true;
aoqi@0:   }
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   Klass* that_klass = that->get_Klass();
aoqi@0:   bool result = this_klass->is_subtype_of(that_klass);
aoqi@0: 
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::is_subclass_of
aoqi@0: bool ciKlass::is_subclass_of(ciKlass* that) {
aoqi@0:   assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii()));
aoqi@0:   assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii()));
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   Klass* that_klass = that->get_Klass();
aoqi@0:   bool result = this_klass->is_subclass_of(that_klass);
aoqi@0: 
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::super_depth
aoqi@0: juint ciKlass::super_depth() {
aoqi@0:   assert(is_loaded(), "must be loaded");
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   return this_klass->super_depth();
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::super_check_offset
aoqi@0: juint ciKlass::super_check_offset() {
aoqi@0:   assert(is_loaded(), "must be loaded");
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   return this_klass->super_check_offset();
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::super_of_depth
aoqi@0: ciKlass* ciKlass::super_of_depth(juint i) {
aoqi@0:   assert(is_loaded(), "must be loaded");
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   Klass* super = this_klass->primary_super_of_depth(i);
aoqi@0:   return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::can_be_primary_super
aoqi@0: bool ciKlass::can_be_primary_super() {
aoqi@0:   assert(is_loaded(), "must be loaded");
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   return this_klass->can_be_primary_super();
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::least_common_ancestor
aoqi@0: //
aoqi@0: // Get the shared parent of two klasses.
aoqi@0: //
aoqi@0: // Implementation note: this method currently goes "over the wall"
aoqi@0: // and does all of the work on the VM side.  It could be rewritten
aoqi@0: // to use the super() method and do all of the work (aside from the
aoqi@0: // lazy computation of super()) in native mode.  This may be
aoqi@0: // worthwhile if the compiler is repeatedly requesting the same lca
aoqi@0: // computation or possibly if most of the superklasses have already
aoqi@0: // been created as ciObjects anyway.  Something to think about...
aoqi@0: ciKlass*
aoqi@0: ciKlass::least_common_ancestor(ciKlass* that) {
aoqi@0:   assert(is_loaded() && that->is_loaded(), "must be loaded");
aoqi@0:   // Check to see if the klasses are identical.
aoqi@0:   if (this == that) {
aoqi@0:     return this;
aoqi@0:   }
aoqi@0: 
aoqi@0:   VM_ENTRY_MARK;
aoqi@0:   Klass* this_klass = get_Klass();
aoqi@0:   Klass* that_klass = that->get_Klass();
aoqi@0:   Klass* lca        = this_klass->LCA(that_klass);
aoqi@0: 
aoqi@0:   // Many times the LCA will be either this_klass or that_klass.
aoqi@0:   // Treat these as special cases.
aoqi@0:   if (lca == that_klass) {
aoqi@0:     return that;
aoqi@0:   }
aoqi@0:   if (this_klass == lca) {
aoqi@0:     return this;
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Create the ciInstanceKlass for the lca.
aoqi@0:   ciKlass* result =
aoqi@0:     CURRENT_THREAD_ENV->get_klass(lca);
aoqi@0: 
aoqi@0:   return result;
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::find_klass
aoqi@0: //
aoqi@0: // Find a klass using this klass's class loader.
aoqi@0: ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
aoqi@0:   assert(is_loaded(), "cannot find_klass through an unloaded klass");
aoqi@0:   return CURRENT_ENV->get_klass_by_name(this,
aoqi@0:                                         klass_name, false);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::java_mirror
aoqi@0: //
aoqi@0: // Get the instance of java.lang.Class corresponding to this klass.
aoqi@0: // If it is an unloaded instance or array klass, return an unloaded
aoqi@0: // mirror object of type Class.
aoqi@0: ciInstance* ciKlass::java_mirror() {
aoqi@0:   GUARDED_VM_ENTRY(
aoqi@0:     if (!is_loaded())
aoqi@0:       return ciEnv::current()->get_unloaded_klass_mirror(this);
aoqi@0:     oop java_mirror = get_Klass()->java_mirror();
aoqi@0:     return CURRENT_ENV->get_instance(java_mirror);
aoqi@0:   )
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::modifier_flags
aoqi@0: jint ciKlass::modifier_flags() {
aoqi@0:   assert(is_loaded(), "not loaded");
aoqi@0:   GUARDED_VM_ENTRY(
aoqi@0:     return get_Klass()->modifier_flags();
aoqi@0:   )
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::access_flags
aoqi@0: jint ciKlass::access_flags() {
aoqi@0:   assert(is_loaded(), "not loaded");
aoqi@0:   GUARDED_VM_ENTRY(
aoqi@0:     return get_Klass()->access_flags().as_int();
aoqi@0:   )
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::print_impl
aoqi@0: //
aoqi@0: // Implementation of the print method
aoqi@0: void ciKlass::print_impl(outputStream* st) {
aoqi@0:   st->print(" name=");
aoqi@0:   print_name_on(st);
aoqi@0: }
aoqi@0: 
aoqi@0: // ------------------------------------------------------------------
aoqi@0: // ciKlass::print_name
aoqi@0: //
aoqi@0: // Print the name of this klass
aoqi@0: void ciKlass::print_name_on(outputStream* st) {
aoqi@0:   name()->print_symbol_on(st);
aoqi@0: }