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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/_ciObjArrayKlass.cpp.incl"
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27
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28 // ciObjArrayKlass
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29 //
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30 // This class represents a klassOop in the HotSpot virtual machine
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31 // whose Klass part is an objArrayKlass.
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32
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33 // ------------------------------------------------------------------
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34 // ciObjArrayKlass::ciObjArrayKlass
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35 //
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36 // Constructor for loaded object array klasses.
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37 ciObjArrayKlass::ciObjArrayKlass(KlassHandle h_k) : ciArrayKlass(h_k) {
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38 assert(get_Klass()->oop_is_objArray(), "wrong type");
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39 klassOop element_klassOop = get_objArrayKlass()->bottom_klass();
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40 _base_element_klass = CURRENT_ENV->get_object(element_klassOop)->as_klass();
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41 assert(_base_element_klass->is_instance_klass() ||
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42 _base_element_klass->is_type_array_klass(), "bad base klass");
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43 if (dimension() == 1) {
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44 _element_klass = _base_element_klass;
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45 } else {
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46 _element_klass = NULL;
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47 }
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48 if (!ciObjectFactory::is_initialized()) {
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49 assert(_element_klass->is_java_lang_Object(), "only arrays of object are shared");
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50 }
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51 }
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52
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53 // ------------------------------------------------------------------
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54 // ciObjArrayKlass::ciObjArrayKlass
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55 //
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56 // Constructor for unloaded object array klasses.
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57 ciObjArrayKlass::ciObjArrayKlass(ciSymbol* array_name,
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58 ciKlass* base_element_klass,
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59 int dimension)
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60 : ciArrayKlass(array_name,
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61 dimension,
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62 ciObjArrayKlassKlass::make()) {
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63 _base_element_klass = base_element_klass;
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64 assert(_base_element_klass->is_instance_klass() ||
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65 _base_element_klass->is_type_array_klass(), "bad base klass");
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66 if (dimension == 1) {
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67 _element_klass = base_element_klass;
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68 } else {
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69 _element_klass = NULL;
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70 }
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71 }
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72
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73 // ------------------------------------------------------------------
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74 // ciObjArrayKlass::element_klass
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75 //
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76 // What is the one-level element type of this array?
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77 ciKlass* ciObjArrayKlass::element_klass() {
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78 if (_element_klass == NULL) {
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79 assert(dimension() > 1, "_element_klass should not be NULL");
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80 // Produce the element klass.
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81 if (is_loaded()) {
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82 VM_ENTRY_MARK;
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83 klassOop element_klassOop = get_objArrayKlass()->element_klass();
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84 _element_klass = CURRENT_THREAD_ENV->get_object(element_klassOop)->as_klass();
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85 } else {
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86 VM_ENTRY_MARK;
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87 // We are an unloaded array klass. Attempt to fetch our
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88 // element klass by name.
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89 _element_klass = CURRENT_THREAD_ENV->get_klass_by_name_impl(
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90 this,
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91 construct_array_name(base_element_klass()->name(),
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92 dimension() - 1),
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93 false);
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94 }
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95 }
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96 return _element_klass;
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97 }
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98
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99 // ------------------------------------------------------------------
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100 // ciObjArrayKlass::construct_array_name
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101 //
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102 // Build an array name from an element name and a dimension.
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103 ciSymbol* ciObjArrayKlass::construct_array_name(ciSymbol* element_name,
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104 int dimension) {
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105 EXCEPTION_CONTEXT;
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106 int element_len = element_name->utf8_length();
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107
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108 symbolOop base_name_sym = element_name->get_symbolOop();
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109 char* name;
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110
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111 if (base_name_sym->byte_at(0) == '[' ||
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112 (base_name_sym->byte_at(0) == 'L' && // watch package name 'Lxx'
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113 base_name_sym->byte_at(element_len-1) == ';')) {
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114
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115 int new_len = element_len + dimension + 1; // for the ['s and '\0'
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116 name = CURRENT_THREAD_ENV->name_buffer(new_len);
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117
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118 int pos = 0;
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119 for ( ; pos < dimension; pos++) {
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120 name[pos] = '[';
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121 }
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122 strncpy(name+pos, (char*)element_name->base(), element_len);
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123 name[new_len-1] = '\0';
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124 } else {
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125 int new_len = 3 // for L, ;, and '\0'
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126 + dimension // for ['s
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127 + element_len;
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128
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129 name = CURRENT_THREAD_ENV->name_buffer(new_len);
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130 int pos = 0;
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131 for ( ; pos < dimension; pos++) {
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132 name[pos] = '[';
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133 }
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134 name[pos++] = 'L';
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135 strncpy(name+pos, (char*)element_name->base(), element_len);
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136 name[new_len-2] = ';';
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137 name[new_len-1] = '\0';
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138 }
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139 return ciSymbol::make(name);
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140 }
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141
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142 // ------------------------------------------------------------------
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143 // ciObjArrayKlass::make_impl
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144 //
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145 // Implementation of make.
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146 ciObjArrayKlass* ciObjArrayKlass::make_impl(ciKlass* element_klass) {
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147
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148 if (element_klass->is_loaded()) {
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149 EXCEPTION_CONTEXT;
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150 // The element klass is loaded
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151 klassOop array = element_klass->get_Klass()->array_klass(THREAD);
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152 if (HAS_PENDING_EXCEPTION) {
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153 CLEAR_PENDING_EXCEPTION;
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154 CURRENT_THREAD_ENV->record_out_of_memory_failure();
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155 return ciEnv::unloaded_ciobjarrayklass();
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156 }
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157 return CURRENT_THREAD_ENV->get_object(array)->as_obj_array_klass();
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158 }
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159
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160 // The array klass was unable to be made or the element klass was
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161 // not loaded.
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162 ciSymbol* array_name = construct_array_name(element_klass->name(), 1);
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163 if (array_name == ciEnv::unloaded_cisymbol()) {
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164 return ciEnv::unloaded_ciobjarrayklass();
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165 }
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166 return
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167 CURRENT_ENV->get_unloaded_klass(element_klass, array_name)
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168 ->as_obj_array_klass();
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169 }
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170
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171 // ------------------------------------------------------------------
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172 // ciObjArrayKlass::make
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173 //
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174 // Make an array klass corresponding to the specified primitive type.
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175 ciObjArrayKlass* ciObjArrayKlass::make(ciKlass* element_klass) {
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176 assert(element_klass->is_java_klass(), "wrong kind of klass");
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177 GUARDED_VM_ENTRY(return make_impl(element_klass);)
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178 }
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