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1 /*
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2 * Copyright 1999-2005 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/_ciInstance.cpp.incl"
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27
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28 // ciInstance
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29 //
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30 // This class represents an instanceOop 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 // ciObject::java_mirror_type
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35 ciType* ciInstance::java_mirror_type() {
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36 VM_ENTRY_MARK;
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37 oop m = get_oop();
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38 // Return NULL if it is not java.lang.Class.
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39 if (m == NULL || m->klass() != SystemDictionary::class_klass()) {
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40 return NULL;
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41 }
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42 // Return either a primitive type or a klass.
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43 if (java_lang_Class::is_primitive(m)) {
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44 return ciType::make(java_lang_Class::primitive_type(m));
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45 } else {
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46 klassOop k = java_lang_Class::as_klassOop(m);
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47 assert(k != NULL, "");
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48 return CURRENT_THREAD_ENV->get_object(k)->as_klass();
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49 }
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50 }
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51
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52 // ------------------------------------------------------------------
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53 // ciInstance::field_value
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54 //
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55 // Constant value of a field.
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56 ciConstant ciInstance::field_value(ciField* field) {
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57 assert(is_loaded() &&
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58 field->holder()->is_loaded() &&
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59 klass()->is_subclass_of(field->holder()),
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60 "invalid access");
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61 VM_ENTRY_MARK;
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62 ciConstant result;
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63 oop obj = get_oop();
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64 assert(obj != NULL, "bad oop");
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65 BasicType field_btype = field->type()->basic_type();
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66 int offset = field->offset();
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67
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68 switch(field_btype) {
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69 case T_BYTE:
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70 return ciConstant(field_btype, obj->byte_field(offset));
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71 break;
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72 case T_CHAR:
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73 return ciConstant(field_btype, obj->char_field(offset));
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74 break;
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75 case T_SHORT:
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76 return ciConstant(field_btype, obj->short_field(offset));
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77 break;
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78 case T_BOOLEAN:
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79 return ciConstant(field_btype, obj->bool_field(offset));
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80 break;
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81 case T_INT:
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82 return ciConstant(field_btype, obj->int_field(offset));
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83 break;
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84 case T_FLOAT:
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85 return ciConstant(obj->float_field(offset));
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86 break;
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87 case T_DOUBLE:
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88 return ciConstant(obj->double_field(offset));
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89 break;
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90 case T_LONG:
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91 return ciConstant(obj->long_field(offset));
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92 break;
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93 case T_OBJECT:
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94 case T_ARRAY:
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95 {
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96 oop o = obj->obj_field(offset);
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97
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98 // A field will be "constant" if it is known always to be
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99 // a non-null reference to an instance of a particular class,
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100 // or to a particular array. This can happen even if the instance
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101 // or array is not perm. In such a case, an "unloaded" ciArray
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102 // or ciInstance is created. The compiler may be able to use
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103 // information about the object's class (which is exact) or length.
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104
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105 if (o == NULL) {
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106 return ciConstant(field_btype, ciNullObject::make());
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107 } else {
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108 return ciConstant(field_btype, CURRENT_ENV->get_object(o));
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109 }
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110 }
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111 }
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112 ShouldNotReachHere();
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113 // to shut up the compiler
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114 return ciConstant();
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115 }
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116
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117 // ------------------------------------------------------------------
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118 // ciInstance::field_value_by_offset
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119 //
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120 // Constant value of a field at the specified offset.
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121 ciConstant ciInstance::field_value_by_offset(int field_offset) {
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122 ciInstanceKlass* ik = klass()->as_instance_klass();
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123 ciField* field = ik->get_field_by_offset(field_offset, false);
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124 return field_value(field);
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125 }
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126
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127 // ------------------------------------------------------------------
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128 // ciInstance::print_impl
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129 //
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130 // Implementation of the print method.
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131 void ciInstance::print_impl(outputStream* st) {
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132 st->print(" type=");
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133 klass()->print(st);
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134 }
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