ciKlass.cpp revision 2273:1d1603768966
1/* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "ci/ciKlass.hpp" 27#include "ci/ciSymbol.hpp" 28#include "ci/ciUtilities.hpp" 29#include "oops/oop.inline.hpp" 30 31// ciKlass 32// 33// This class represents a klassOop in the HotSpot virtual 34// machine. 35 36// ------------------------------------------------------------------ 37// ciKlass::ciKlass 38ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) { 39 assert(get_oop()->is_klass(), "wrong type"); 40 Klass* k = get_Klass(); 41 _layout_helper = k->layout_helper(); 42 Symbol* klass_name = k->name(); 43 assert(klass_name != NULL, "wrong ciKlass constructor"); 44 _name = CURRENT_ENV->get_symbol(klass_name); 45} 46 47// ------------------------------------------------------------------ 48// ciKlass::ciKlass 49// 50// Nameless klass variant. 51ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) { 52 assert(get_oop()->is_klass(), "wrong type"); 53 _name = name; 54 _layout_helper = Klass::_lh_neutral_value; 55} 56 57// ------------------------------------------------------------------ 58// ciKlass::ciKlass 59// 60// Unloaded klass variant. 61ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) { 62 _name = name; 63 _layout_helper = Klass::_lh_neutral_value; 64} 65 66// ------------------------------------------------------------------ 67// ciKlass::is_subtype_of 68bool ciKlass::is_subtype_of(ciKlass* that) { 69 assert(is_loaded() && that->is_loaded(), "must be loaded"); 70 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 71 // Check to see if the klasses are identical. 72 if (this == that) { 73 return true; 74 } 75 76 VM_ENTRY_MARK; 77 Klass* this_klass = get_Klass(); 78 klassOop that_klass = that->get_klassOop(); 79 bool result = this_klass->is_subtype_of(that_klass); 80 81 return result; 82} 83 84// ------------------------------------------------------------------ 85// ciKlass::is_subclass_of 86bool ciKlass::is_subclass_of(ciKlass* that) { 87 assert(is_loaded() && that->is_loaded(), "must be loaded"); 88 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 89 // Check to see if the klasses are identical. 90 91 VM_ENTRY_MARK; 92 Klass* this_klass = get_Klass(); 93 klassOop that_klass = that->get_klassOop(); 94 bool result = this_klass->is_subclass_of(that_klass); 95 96 return result; 97} 98 99// ------------------------------------------------------------------ 100// ciKlass::super_depth 101juint ciKlass::super_depth() { 102 assert(is_loaded(), "must be loaded"); 103 assert(is_java_klass(), "must be java klasses"); 104 105 VM_ENTRY_MARK; 106 Klass* this_klass = get_Klass(); 107 return this_klass->super_depth(); 108} 109 110// ------------------------------------------------------------------ 111// ciKlass::super_check_offset 112juint ciKlass::super_check_offset() { 113 assert(is_loaded(), "must be loaded"); 114 assert(is_java_klass(), "must be java klasses"); 115 116 VM_ENTRY_MARK; 117 Klass* this_klass = get_Klass(); 118 return this_klass->super_check_offset(); 119} 120 121// ------------------------------------------------------------------ 122// ciKlass::super_of_depth 123ciKlass* ciKlass::super_of_depth(juint i) { 124 assert(is_loaded(), "must be loaded"); 125 assert(is_java_klass(), "must be java klasses"); 126 127 VM_ENTRY_MARK; 128 Klass* this_klass = get_Klass(); 129 klassOop super = this_klass->primary_super_of_depth(i); 130 return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL; 131} 132 133// ------------------------------------------------------------------ 134// ciKlass::can_be_primary_super 135bool ciKlass::can_be_primary_super() { 136 assert(is_loaded(), "must be loaded"); 137 assert(is_java_klass(), "must be java klasses"); 138 139 VM_ENTRY_MARK; 140 Klass* this_klass = get_Klass(); 141 return this_klass->can_be_primary_super(); 142} 143 144// ------------------------------------------------------------------ 145// ciKlass::least_common_ancestor 146// 147// Get the shared parent of two klasses. 148// 149// Implementation note: this method currently goes "over the wall" 150// and does all of the work on the VM side. It could be rewritten 151// to use the super() method and do all of the work (aside from the 152// lazy computation of super()) in native mode. This may be 153// worthwhile if the compiler is repeatedly requesting the same lca 154// computation or possibly if most of the superklasses have already 155// been created as ciObjects anyway. Something to think about... 156ciKlass* 157ciKlass::least_common_ancestor(ciKlass* that) { 158 assert(is_loaded() && that->is_loaded(), "must be loaded"); 159 assert(is_java_klass() && that->is_java_klass(), "must be java klasses"); 160 // Check to see if the klasses are identical. 161 if (this == that) { 162 return this; 163 } 164 165 VM_ENTRY_MARK; 166 Klass* this_klass = get_Klass(); 167 Klass* that_klass = that->get_Klass(); 168 Klass* lca = this_klass->LCA(that_klass); 169 170 // Many times the LCA will be either this_klass or that_klass. 171 // Treat these as special cases. 172 if (lca == that_klass) { 173 return that; 174 } 175 if (this_klass == lca) { 176 return this; 177 } 178 179 // Create the ciInstanceKlass for the lca. 180 ciKlass* result = 181 CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass(); 182 183 return result; 184} 185 186// ------------------------------------------------------------------ 187// ciKlass::find_klass 188// 189// Find a klass using this klass's class loader. 190ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { 191 assert(is_loaded(), "cannot find_klass through an unloaded klass"); 192 return CURRENT_ENV->get_klass_by_name(this, 193 klass_name, false); 194} 195 196// ------------------------------------------------------------------ 197// ciKlass::java_mirror 198// 199// Get the instance of java.lang.Class corresponding to this klass. 200// If it is an unloaded instance or array klass, return an unloaded 201// mirror object of type Class. 202ciInstance* ciKlass::java_mirror() { 203 GUARDED_VM_ENTRY( 204 if (!is_loaded()) 205 return ciEnv::current()->get_unloaded_klass_mirror(this); 206 oop java_mirror = get_Klass()->java_mirror(); 207 return CURRENT_ENV->get_object(java_mirror)->as_instance(); 208 ) 209} 210 211// ------------------------------------------------------------------ 212// ciKlass::modifier_flags 213jint ciKlass::modifier_flags() { 214 assert(is_loaded(), "not loaded"); 215 GUARDED_VM_ENTRY( 216 return get_Klass()->modifier_flags(); 217 ) 218} 219 220// ------------------------------------------------------------------ 221// ciKlass::access_flags 222jint ciKlass::access_flags() { 223 assert(is_loaded(), "not loaded"); 224 GUARDED_VM_ENTRY( 225 return get_Klass()->access_flags().as_int(); 226 ) 227} 228 229// ------------------------------------------------------------------ 230// ciKlass::print_impl 231// 232// Implementation of the print method 233void ciKlass::print_impl(outputStream* st) { 234 st->print(" name="); 235 print_name_on(st); 236} 237 238// ------------------------------------------------------------------ 239// ciKlass::print_name 240// 241// Print the name of this klass 242void ciKlass::print_name_on(outputStream* st) { 243 name()->print_symbol_on(st); 244} 245