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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 } |