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1 /* |
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2 * Copyright (c) 1999, 2013, 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 #ifndef SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP |
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26 #define SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 #include "oops/instanceKlass.hpp" |
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30 #include "oops/objArrayOop.hpp" |
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31 #include "oops/oopsHierarchy.hpp" |
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32 #include "runtime/handles.inline.hpp" |
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33 #include "runtime/reflection.hpp" |
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34 #include "utilities/accessFlags.hpp" |
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35 #include "utilities/globalDefinitions.hpp" |
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36 |
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37 // A KlassStream is an abstract stream for streaming over self, superclasses |
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38 // and (super)interfaces. Streaming is done in reverse order (subclasses first, |
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39 // interfaces last). |
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40 // |
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41 // for (KlassStream st(k, false, false, false); !st.eos(); st.next()) { |
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42 // Klass* k = st.klass(); |
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43 // ... |
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44 // } |
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45 |
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46 class KlassStream VALUE_OBJ_CLASS_SPEC { |
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47 protected: |
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48 instanceKlassHandle _klass; // current klass/interface iterated over |
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49 instanceKlassHandle _base_klass; // initial klass/interface to iterate over |
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50 Array<Klass*>* _interfaces; // transitive interfaces for initial class |
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51 int _interface_index; // current interface being processed |
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52 bool _local_only; // process initial class/interface only |
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53 bool _classes_only; // process classes only (no interfaces) |
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54 bool _walk_defaults; // process default methods |
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55 bool _base_class_search_defaults; // time to process default methods |
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56 bool _defaults_checked; // already checked for default methods |
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57 int _index; |
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58 |
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59 virtual int length() = 0; |
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60 |
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61 public: |
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62 // constructor |
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63 KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only, bool walk_defaults); |
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64 |
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65 // testing |
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66 bool eos(); |
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67 |
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68 // iterating |
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69 virtual void next() = 0; |
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70 |
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71 // accessors |
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72 instanceKlassHandle klass() const { return _klass; } |
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73 int index() const { return _index; } |
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74 bool base_class_search_defaults() const { return _base_class_search_defaults; } |
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75 void base_class_search_defaults(bool b) { _base_class_search_defaults = b; } |
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76 }; |
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77 |
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78 |
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79 // A MethodStream streams over all methods in a class, superclasses and (super)interfaces. |
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80 // Streaming is done in reverse order (subclasses first, methods in reverse order) |
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81 // Usage: |
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82 // |
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83 // for (MethodStream st(k, false, false); !st.eos(); st.next()) { |
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84 // Method* m = st.method(); |
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85 // ... |
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86 // } |
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87 |
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88 class MethodStream : public KlassStream { |
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89 private: |
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90 int length() { return methods()->length(); } |
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91 Array<Method*>* methods() { |
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92 if (base_class_search_defaults()) { |
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93 base_class_search_defaults(false); |
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94 return _klass->default_methods(); |
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95 } else { |
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96 return _klass->methods(); |
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97 } |
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98 } |
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99 public: |
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100 MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
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101 : KlassStream(klass, local_only, classes_only, true) { |
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102 _index = length(); |
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103 next(); |
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104 } |
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105 |
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106 void next() { _index--; } |
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107 Method* method() { return methods()->at(index()); } |
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108 }; |
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109 |
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110 |
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111 // A FieldStream streams over all fields in a class, superclasses and (super)interfaces. |
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112 // Streaming is done in reverse order (subclasses first, fields in reverse order) |
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113 // Usage: |
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114 // |
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115 // for (FieldStream st(k, false, false); !st.eos(); st.next()) { |
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116 // Symbol* field_name = st.name(); |
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117 // ... |
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118 // } |
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119 |
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120 |
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121 class FieldStream : public KlassStream { |
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122 private: |
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123 int length() { return _klass->java_fields_count(); } |
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124 |
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125 fieldDescriptor _fd_buf; |
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126 |
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127 public: |
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128 FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
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129 : KlassStream(klass, local_only, classes_only, false) { |
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130 _index = length(); |
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131 next(); |
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132 } |
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133 |
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134 void next() { _index -= 1; } |
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135 |
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136 // Accessors for current field |
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137 AccessFlags access_flags() const { |
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138 AccessFlags flags; |
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139 flags.set_flags(_klass->field_access_flags(_index)); |
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140 return flags; |
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141 } |
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142 Symbol* name() const { |
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143 return _klass->field_name(_index); |
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144 } |
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145 Symbol* signature() const { |
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146 return _klass->field_signature(_index); |
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147 } |
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148 // missing: initval() |
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149 int offset() const { |
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150 return _klass->field_offset( index() ); |
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151 } |
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152 // bridge to a heavier API: |
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153 fieldDescriptor& field_descriptor() const { |
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154 fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf); |
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155 field.reinitialize(_klass(), _index); |
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156 return field; |
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157 } |
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158 }; |
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159 |
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160 class FilteredField : public CHeapObj<mtInternal> { |
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161 private: |
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162 Klass* _klass; |
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163 int _field_offset; |
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164 |
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165 public: |
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166 FilteredField(Klass* klass, int field_offset) { |
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167 _klass = klass; |
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168 _field_offset = field_offset; |
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169 } |
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170 Klass* klass() { return _klass; } |
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171 int field_offset() { return _field_offset; } |
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172 }; |
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173 |
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174 class FilteredFieldsMap : AllStatic { |
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175 private: |
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176 static GrowableArray<FilteredField *> *_filtered_fields; |
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177 public: |
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178 static void initialize(); |
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179 static bool is_filtered_field(Klass* klass, int field_offset) { |
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180 for (int i=0; i < _filtered_fields->length(); i++) { |
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181 if (klass == _filtered_fields->at(i)->klass() && |
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182 field_offset == _filtered_fields->at(i)->field_offset()) { |
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183 return true; |
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184 } |
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185 } |
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186 return false; |
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187 } |
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188 static int filtered_fields_count(Klass* klass, bool local_only) { |
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189 int nflds = 0; |
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190 for (int i=0; i < _filtered_fields->length(); i++) { |
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191 if (local_only && klass == _filtered_fields->at(i)->klass()) { |
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192 nflds++; |
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193 } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) { |
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194 nflds++; |
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195 } |
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196 } |
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197 return nflds; |
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198 } |
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199 // Enhance Class Redefinition Support |
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200 static void classes_do(KlassClosure* f) { |
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201 for (int i = 0; i < _filtered_fields->length(); i++) { |
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202 f->do_klass(_filtered_fields->at(i)->klass()); |
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203 } |
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204 } |
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205 }; |
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206 |
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207 |
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208 // A FilteredFieldStream streams over all fields in a class, superclasses and |
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209 // (super)interfaces. Streaming is done in reverse order (subclasses first, |
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210 // fields in reverse order) |
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211 // |
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212 // Usage: |
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213 // |
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214 // for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) { |
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215 // Symbol* field_name = st.name(); |
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216 // ... |
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217 // } |
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218 |
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219 class FilteredFieldStream : public FieldStream { |
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220 private: |
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221 int _filtered_fields_count; |
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222 bool has_filtered_field() { return (_filtered_fields_count > 0); } |
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223 |
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224 public: |
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225 FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
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226 : FieldStream(klass, local_only, classes_only) { |
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227 _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((Klass*)klass(), local_only); |
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228 } |
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229 int field_count(); |
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230 void next() { |
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231 _index -= 1; |
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232 if (has_filtered_field()) { |
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233 while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass(), offset())) { |
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234 _index -= 1; |
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235 } |
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236 } |
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237 } |
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238 }; |
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239 |
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240 #endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP |