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1 /* |
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2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "ci/ciConstant.hpp" |
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27 #include "ci/ciField.hpp" |
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28 #include "ci/ciInstance.hpp" |
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29 #include "ci/ciInstanceKlass.hpp" |
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30 #include "ci/ciUtilities.hpp" |
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31 #include "classfile/systemDictionary.hpp" |
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32 #include "oops/oop.inline.hpp" |
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33 |
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34 // ciInstance |
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35 // |
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36 // This class represents an instanceOop in the HotSpot virtual |
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37 // machine. |
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38 |
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39 // ------------------------------------------------------------------ |
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40 // ciObject::java_mirror_type |
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41 ciType* ciInstance::java_mirror_type() { |
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42 VM_ENTRY_MARK; |
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43 oop m = get_oop(); |
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44 // Return NULL if it is not java.lang.Class. |
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45 if (m == NULL || m->klass() != SystemDictionary::Class_klass()) { |
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46 return NULL; |
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47 } |
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48 // Return either a primitive type or a klass. |
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49 if (java_lang_Class::is_primitive(m)) { |
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50 return ciType::make(java_lang_Class::primitive_type(m)); |
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51 } else { |
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52 Klass* k = java_lang_Class::as_Klass(m); |
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53 assert(k != NULL, ""); |
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54 return CURRENT_THREAD_ENV->get_klass(k); |
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55 } |
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56 } |
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57 |
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58 // ------------------------------------------------------------------ |
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59 // ciInstance::field_value_impl |
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60 ciConstant ciInstance::field_value_impl(BasicType field_btype, int offset) { |
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61 oop obj = get_oop(); |
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62 assert(obj != NULL, "bad oop"); |
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63 switch(field_btype) { |
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64 case T_BYTE: return ciConstant(field_btype, obj->byte_field(offset)); |
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65 case T_CHAR: return ciConstant(field_btype, obj->char_field(offset)); |
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66 case T_SHORT: return ciConstant(field_btype, obj->short_field(offset)); |
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67 case T_BOOLEAN: return ciConstant(field_btype, obj->bool_field(offset)); |
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68 case T_INT: return ciConstant(field_btype, obj->int_field(offset)); |
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69 case T_FLOAT: return ciConstant(obj->float_field(offset)); |
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70 case T_DOUBLE: return ciConstant(obj->double_field(offset)); |
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71 case T_LONG: return ciConstant(obj->long_field(offset)); |
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72 case T_OBJECT: // fall through |
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73 case T_ARRAY: { |
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74 oop o = obj->obj_field(offset); |
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75 |
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76 // A field will be "constant" if it is known always to be |
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77 // a non-null reference to an instance of a particular class, |
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78 // or to a particular array. This can happen even if the instance |
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79 // or array is not perm. In such a case, an "unloaded" ciArray |
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80 // or ciInstance is created. The compiler may be able to use |
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81 // information about the object's class (which is exact) or length. |
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82 |
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83 if (o == NULL) { |
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84 return ciConstant(field_btype, ciNullObject::make()); |
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85 } else { |
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86 return ciConstant(field_btype, CURRENT_ENV->get_object(o)); |
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87 } |
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88 } |
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89 default: |
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90 fatal("no field value: %s", type2name(field_btype)); |
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91 return ciConstant(); |
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92 } |
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93 } |
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94 |
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95 // ------------------------------------------------------------------ |
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96 // ciInstance::field_value |
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97 // |
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98 // Constant value of a field. |
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99 ciConstant ciInstance::field_value(ciField* field) { |
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100 assert(is_loaded(), "invalid access - must be loaded"); |
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101 assert(field->holder()->is_loaded(), "invalid access - holder must be loaded"); |
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102 assert(field->is_static() || klass()->is_subclass_of(field->holder()), "invalid access - must be subclass"); |
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103 |
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104 GUARDED_VM_ENTRY(return field_value_impl(field->type()->basic_type(), field->offset());) |
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105 } |
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106 |
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107 // ------------------------------------------------------------------ |
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108 // ciInstance::field_value_by_offset |
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109 // |
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110 // Constant value of a field at the specified offset. |
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111 ciConstant ciInstance::field_value_by_offset(int field_offset) { |
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112 ciInstanceKlass* ik = klass()->as_instance_klass(); |
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113 ciField* field = ik->get_field_by_offset(field_offset, false); |
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114 if (field == NULL) |
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115 return ciConstant(); // T_ILLEGAL |
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116 return field_value(field); |
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117 } |
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118 |
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119 // ------------------------------------------------------------------ |
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120 // ciInstance::print_impl |
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121 // |
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122 // Implementation of the print method. |
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123 void ciInstance::print_impl(outputStream* st) { |
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124 st->print(" type="); |
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125 klass()->print(st); |
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126 } |
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127 |
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128 |
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129 ciKlass* ciInstance::java_lang_Class_klass() { |
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130 VM_ENTRY_MARK; |
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131 return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass(); |
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132 } |