1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciKlass.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,235 @@
1.4 +/*
1.5 + * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_ciKlass.cpp.incl"
1.30 +
1.31 +// ciKlass
1.32 +//
1.33 +// This class represents a klassOop in the HotSpot virtual
1.34 +// machine.
1.35 +
1.36 +// ------------------------------------------------------------------
1.37 +// ciKlass::ciKlass
1.38 +ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
1.39 + assert(get_oop()->is_klass(), "wrong type");
1.40 + Klass* k = get_Klass();
1.41 + _layout_helper = k->layout_helper();
1.42 + symbolOop klass_name = k->name();
1.43 + assert(klass_name != NULL, "wrong ciKlass constructor");
1.44 + _name = CURRENT_ENV->get_object(klass_name)->as_symbol();
1.45 +}
1.46 +
1.47 +// ------------------------------------------------------------------
1.48 +// ciKlass::ciKlass
1.49 +//
1.50 +// Nameless klass variant.
1.51 +ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
1.52 + assert(get_oop()->is_klass(), "wrong type");
1.53 + _name = name;
1.54 + _layout_helper = Klass::_lh_neutral_value;
1.55 +}
1.56 +
1.57 +// ------------------------------------------------------------------
1.58 +// ciKlass::ciKlass
1.59 +//
1.60 +// Unloaded klass variant.
1.61 +ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) {
1.62 + _name = name;
1.63 + _layout_helper = Klass::_lh_neutral_value;
1.64 +}
1.65 +
1.66 +// ------------------------------------------------------------------
1.67 +// ciKlass::is_subtype_of
1.68 +bool ciKlass::is_subtype_of(ciKlass* that) {
1.69 + assert(is_loaded() && that->is_loaded(), "must be loaded");
1.70 + assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
1.71 + // Check to see if the klasses are identical.
1.72 + if (this == that) {
1.73 + return true;
1.74 + }
1.75 +
1.76 + VM_ENTRY_MARK;
1.77 + Klass* this_klass = get_Klass();
1.78 + klassOop that_klass = that->get_klassOop();
1.79 + bool result = this_klass->is_subtype_of(that_klass);
1.80 +
1.81 + return result;
1.82 +}
1.83 +
1.84 +// ------------------------------------------------------------------
1.85 +// ciKlass::is_subclass_of
1.86 +bool ciKlass::is_subclass_of(ciKlass* that) {
1.87 + assert(is_loaded() && that->is_loaded(), "must be loaded");
1.88 + assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
1.89 + // Check to see if the klasses are identical.
1.90 +
1.91 + VM_ENTRY_MARK;
1.92 + Klass* this_klass = get_Klass();
1.93 + klassOop that_klass = that->get_klassOop();
1.94 + bool result = this_klass->is_subclass_of(that_klass);
1.95 +
1.96 + return result;
1.97 +}
1.98 +
1.99 +// ------------------------------------------------------------------
1.100 +// ciKlass::super_depth
1.101 +juint ciKlass::super_depth() {
1.102 + assert(is_loaded(), "must be loaded");
1.103 + assert(is_java_klass(), "must be java klasses");
1.104 +
1.105 + VM_ENTRY_MARK;
1.106 + Klass* this_klass = get_Klass();
1.107 + return this_klass->super_depth();
1.108 +}
1.109 +
1.110 +// ------------------------------------------------------------------
1.111 +// ciKlass::super_check_offset
1.112 +juint ciKlass::super_check_offset() {
1.113 + assert(is_loaded(), "must be loaded");
1.114 + assert(is_java_klass(), "must be java klasses");
1.115 +
1.116 + VM_ENTRY_MARK;
1.117 + Klass* this_klass = get_Klass();
1.118 + return this_klass->super_check_offset();
1.119 +}
1.120 +
1.121 +// ------------------------------------------------------------------
1.122 +// ciKlass::super_of_depth
1.123 +ciKlass* ciKlass::super_of_depth(juint i) {
1.124 + assert(is_loaded(), "must be loaded");
1.125 + assert(is_java_klass(), "must be java klasses");
1.126 +
1.127 + VM_ENTRY_MARK;
1.128 + Klass* this_klass = get_Klass();
1.129 + klassOop super = this_klass->primary_super_of_depth(i);
1.130 + return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL;
1.131 +}
1.132 +
1.133 +// ------------------------------------------------------------------
1.134 +// ciKlass::can_be_primary_super
1.135 +bool ciKlass::can_be_primary_super() {
1.136 + assert(is_loaded(), "must be loaded");
1.137 + assert(is_java_klass(), "must be java klasses");
1.138 +
1.139 + VM_ENTRY_MARK;
1.140 + Klass* this_klass = get_Klass();
1.141 + return this_klass->can_be_primary_super();
1.142 +}
1.143 +
1.144 +// ------------------------------------------------------------------
1.145 +// ciKlass::least_common_ancestor
1.146 +//
1.147 +// Get the shared parent of two klasses.
1.148 +//
1.149 +// Implementation note: this method currently goes "over the wall"
1.150 +// and does all of the work on the VM side. It could be rewritten
1.151 +// to use the super() method and do all of the work (aside from the
1.152 +// lazy computation of super()) in native mode. This may be
1.153 +// worthwhile if the compiler is repeatedly requesting the same lca
1.154 +// computation or possibly if most of the superklasses have already
1.155 +// been created as ciObjects anyway. Something to think about...
1.156 +ciKlass*
1.157 +ciKlass::least_common_ancestor(ciKlass* that) {
1.158 + assert(is_loaded() && that->is_loaded(), "must be loaded");
1.159 + assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
1.160 + // Check to see if the klasses are identical.
1.161 + if (this == that) {
1.162 + return this;
1.163 + }
1.164 +
1.165 + VM_ENTRY_MARK;
1.166 + Klass* this_klass = get_Klass();
1.167 + Klass* that_klass = that->get_Klass();
1.168 + Klass* lca = this_klass->LCA(that_klass);
1.169 +
1.170 + // Many times the LCA will be either this_klass or that_klass.
1.171 + // Treat these as special cases.
1.172 + if (lca == that_klass) {
1.173 + return that;
1.174 + }
1.175 + if (this_klass == lca) {
1.176 + return this;
1.177 + }
1.178 +
1.179 + // Create the ciInstanceKlass for the lca.
1.180 + ciKlass* result =
1.181 + CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass();
1.182 +
1.183 + return result;
1.184 +}
1.185 +
1.186 +// ------------------------------------------------------------------
1.187 +// ciKlass::find_klass
1.188 +//
1.189 +// Find a klass using this klass's class loader.
1.190 +ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
1.191 + assert(is_loaded(), "cannot find_klass through an unloaded klass");
1.192 + return CURRENT_ENV->get_klass_by_name(this,
1.193 + klass_name, false);
1.194 +}
1.195 +
1.196 +// ------------------------------------------------------------------
1.197 +// ciKlass::java_mirror
1.198 +ciInstance* ciKlass::java_mirror() {
1.199 + GUARDED_VM_ENTRY(
1.200 + oop java_mirror = get_Klass()->java_mirror();
1.201 + return CURRENT_ENV->get_object(java_mirror)->as_instance();
1.202 + )
1.203 +}
1.204 +
1.205 +// ------------------------------------------------------------------
1.206 +// ciKlass::modifier_flags
1.207 +jint ciKlass::modifier_flags() {
1.208 + assert(is_loaded(), "not loaded");
1.209 + GUARDED_VM_ENTRY(
1.210 + return get_Klass()->modifier_flags();
1.211 + )
1.212 +}
1.213 +
1.214 +// ------------------------------------------------------------------
1.215 +// ciKlass::access_flags
1.216 +jint ciKlass::access_flags() {
1.217 + assert(is_loaded(), "not loaded");
1.218 + GUARDED_VM_ENTRY(
1.219 + return get_Klass()->access_flags().as_int();
1.220 + )
1.221 +}
1.222 +
1.223 +// ------------------------------------------------------------------
1.224 +// ciKlass::print_impl
1.225 +//
1.226 +// Implementation of the print method
1.227 +void ciKlass::print_impl(outputStream* st) {
1.228 + st->print(" name=");
1.229 + print_name_on(st);
1.230 +}
1.231 +
1.232 +// ------------------------------------------------------------------
1.233 +// ciKlass::print_name
1.234 +//
1.235 +// Print the name of this klass
1.236 +void ciKlass::print_name_on(outputStream* st) {
1.237 + name()->print_symbol_on(st);
1.238 +}
