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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_ciKlass.cpp.incl"
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27
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28 // ciKlass
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29 //
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30 // This class represents a klassOop in the HotSpot virtual
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31 // machine.
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32
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33 // ------------------------------------------------------------------
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34 // ciKlass::ciKlass
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35 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {
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36 assert(get_oop()->is_klass(), "wrong type");
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37 Klass* k = get_Klass();
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38 _layout_helper = k->layout_helper();
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39 symbolOop klass_name = k->name();
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40 assert(klass_name != NULL, "wrong ciKlass constructor");
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41 _name = CURRENT_ENV->get_object(klass_name)->as_symbol();
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42 }
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43
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44 // ------------------------------------------------------------------
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45 // ciKlass::ciKlass
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46 //
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47 // Nameless klass variant.
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48 ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {
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49 assert(get_oop()->is_klass(), "wrong type");
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50 _name = name;
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51 _layout_helper = Klass::_lh_neutral_value;
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52 }
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53
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54 // ------------------------------------------------------------------
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55 // ciKlass::ciKlass
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56 //
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57 // Unloaded klass variant.
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58 ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) {
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59 _name = name;
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60 _layout_helper = Klass::_lh_neutral_value;
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61 }
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62
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63 // ------------------------------------------------------------------
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64 // ciKlass::is_subtype_of
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65 bool ciKlass::is_subtype_of(ciKlass* that) {
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66 assert(is_loaded() && that->is_loaded(), "must be loaded");
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67 assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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68 // Check to see if the klasses are identical.
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69 if (this == that) {
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70 return true;
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71 }
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72
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73 VM_ENTRY_MARK;
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74 Klass* this_klass = get_Klass();
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75 klassOop that_klass = that->get_klassOop();
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76 bool result = this_klass->is_subtype_of(that_klass);
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77
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78 return result;
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79 }
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80
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81 // ------------------------------------------------------------------
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82 // ciKlass::is_subclass_of
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83 bool ciKlass::is_subclass_of(ciKlass* that) {
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84 assert(is_loaded() && that->is_loaded(), "must be loaded");
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85 assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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86 // Check to see if the klasses are identical.
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87
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88 VM_ENTRY_MARK;
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89 Klass* this_klass = get_Klass();
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90 klassOop that_klass = that->get_klassOop();
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91 bool result = this_klass->is_subclass_of(that_klass);
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92
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93 return result;
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94 }
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95
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96 // ------------------------------------------------------------------
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97 // ciKlass::super_depth
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98 juint ciKlass::super_depth() {
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99 assert(is_loaded(), "must be loaded");
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100 assert(is_java_klass(), "must be java klasses");
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101
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102 VM_ENTRY_MARK;
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103 Klass* this_klass = get_Klass();
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104 return this_klass->super_depth();
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105 }
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106
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107 // ------------------------------------------------------------------
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108 // ciKlass::super_check_offset
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109 juint ciKlass::super_check_offset() {
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110 assert(is_loaded(), "must be loaded");
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111 assert(is_java_klass(), "must be java klasses");
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112
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113 VM_ENTRY_MARK;
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114 Klass* this_klass = get_Klass();
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115 return this_klass->super_check_offset();
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116 }
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117
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118 // ------------------------------------------------------------------
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119 // ciKlass::super_of_depth
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120 ciKlass* ciKlass::super_of_depth(juint i) {
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121 assert(is_loaded(), "must be loaded");
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122 assert(is_java_klass(), "must be java klasses");
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123
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124 VM_ENTRY_MARK;
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125 Klass* this_klass = get_Klass();
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126 klassOop super = this_klass->primary_super_of_depth(i);
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127 return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL;
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128 }
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129
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130 // ------------------------------------------------------------------
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131 // ciKlass::can_be_primary_super
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132 bool ciKlass::can_be_primary_super() {
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133 assert(is_loaded(), "must be loaded");
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134 assert(is_java_klass(), "must be java klasses");
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135
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136 VM_ENTRY_MARK;
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137 Klass* this_klass = get_Klass();
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138 return this_klass->can_be_primary_super();
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139 }
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140
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141 // ------------------------------------------------------------------
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142 // ciKlass::least_common_ancestor
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143 //
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144 // Get the shared parent of two klasses.
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145 //
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146 // Implementation note: this method currently goes "over the wall"
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147 // and does all of the work on the VM side. It could be rewritten
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148 // to use the super() method and do all of the work (aside from the
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149 // lazy computation of super()) in native mode. This may be
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150 // worthwhile if the compiler is repeatedly requesting the same lca
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151 // computation or possibly if most of the superklasses have already
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152 // been created as ciObjects anyway. Something to think about...
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153 ciKlass*
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154 ciKlass::least_common_ancestor(ciKlass* that) {
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155 assert(is_loaded() && that->is_loaded(), "must be loaded");
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156 assert(is_java_klass() && that->is_java_klass(), "must be java klasses");
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157 // Check to see if the klasses are identical.
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158 if (this == that) {
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159 return this;
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160 }
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161
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162 VM_ENTRY_MARK;
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163 Klass* this_klass = get_Klass();
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164 Klass* that_klass = that->get_Klass();
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165 Klass* lca = this_klass->LCA(that_klass);
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166
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167 // Many times the LCA will be either this_klass or that_klass.
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168 // Treat these as special cases.
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169 if (lca == that_klass) {
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170 return that;
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171 }
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172 if (this_klass == lca) {
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173 return this;
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174 }
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175
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176 // Create the ciInstanceKlass for the lca.
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177 ciKlass* result =
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178 CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass();
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179
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180 return result;
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181 }
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182
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183 // ------------------------------------------------------------------
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184 // ciKlass::find_klass
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185 //
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186 // Find a klass using this klass's class loader.
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187 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {
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188 assert(is_loaded(), "cannot find_klass through an unloaded klass");
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189 return CURRENT_ENV->get_klass_by_name(this,
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190 klass_name, false);
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191 }
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192
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193 // ------------------------------------------------------------------
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194 // ciKlass::java_mirror
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195 ciInstance* ciKlass::java_mirror() {
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196 GUARDED_VM_ENTRY(
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197 oop java_mirror = get_Klass()->java_mirror();
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198 return CURRENT_ENV->get_object(java_mirror)->as_instance();
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199 )
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200 }
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201
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202 // ------------------------------------------------------------------
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203 // ciKlass::modifier_flags
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204 jint ciKlass::modifier_flags() {
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205 assert(is_loaded(), "not loaded");
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206 GUARDED_VM_ENTRY(
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207 return get_Klass()->modifier_flags();
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208 )
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209 }
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210
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211 // ------------------------------------------------------------------
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212 // ciKlass::access_flags
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213 jint ciKlass::access_flags() {
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214 assert(is_loaded(), "not loaded");
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215 GUARDED_VM_ENTRY(
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216 return get_Klass()->access_flags().as_int();
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217 )
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218 }
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219
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220 // ------------------------------------------------------------------
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221 // ciKlass::print_impl
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222 //
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223 // Implementation of the print method
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224 void ciKlass::print_impl(outputStream* st) {
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225 st->print(" name=");
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226 print_name_on(st);
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227 }
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228
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229 // ------------------------------------------------------------------
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230 // ciKlass::print_name
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231 //
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232 // Print the name of this klass
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233 void ciKlass::print_name_on(outputStream* st) {
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234 name()->print_symbol_on(st);
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235 }
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