1 /* |
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2 * Copyright (c) 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 import java.util.*; |
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25 import com.sun.tools.classfile.*; |
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26 import static com.sun.tools.classfile.ConstantPool.*; |
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27 import com.sun.tools.classfile.Instruction.TypeKind; |
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28 |
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29 /** |
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30 * MethodFinder utility class to find references to the given methods. |
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31 */ |
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32 public abstract class MethodFinder { |
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33 final List<String> methods; |
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34 public MethodFinder(String... methods) { |
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35 this.methods = Arrays.asList(methods); |
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36 } |
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37 |
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38 /** |
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39 * A callback method will be invoked when a method referencing |
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40 * any of the lookup methods. |
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41 * |
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42 * @param cf ClassFile |
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43 * @param m Method |
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44 * @param refs Set of constant pool indices that reference the methods |
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45 * matching the given lookup method names |
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46 */ |
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47 public abstract void referenceFound(ClassFile cf, Method m, Set<Integer> refs) |
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48 throws ConstantPoolException; |
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49 |
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50 public String parse(ClassFile cf) throws ConstantPoolException { |
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51 List<Integer> cprefs = new ArrayList<Integer>(); |
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52 int index = 1; |
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53 for (ConstantPool.CPInfo cpInfo : cf.constant_pool.entries()) { |
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54 if (cpInfo.accept(cpVisitor, null)) { |
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55 cprefs.add(index); |
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56 } |
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57 index += cpInfo.size(); |
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58 } |
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59 |
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60 if (!cprefs.isEmpty()) { |
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61 for (Method m : cf.methods) { |
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62 Set<Integer> refs = new HashSet<Integer>(); |
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63 Code_attribute c_attr = (Code_attribute) m.attributes.get(Attribute.Code); |
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64 if (c_attr != null) { |
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65 for (Instruction instr : c_attr.getInstructions()) { |
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66 int idx = instr.accept(codeVisitor, cprefs); |
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67 if (idx > 0) { |
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68 refs.add(idx); |
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69 } |
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70 } |
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71 } |
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72 if (refs.size() > 0) { |
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73 referenceFound(cf, m, refs); |
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74 } |
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75 } |
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76 } |
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77 return cprefs.isEmpty() ? "" : cf.getName(); |
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78 } |
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79 |
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80 private ConstantPool.Visitor<Boolean,Void> cpVisitor = |
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81 new ConstantPool.Visitor<Boolean,Void>() |
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82 { |
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83 private boolean matches(CPRefInfo info) { |
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84 try { |
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85 CONSTANT_NameAndType_info nat = info.getNameAndTypeInfo(); |
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86 return matches(info.getClassName(), nat.getName(), nat.getType()); |
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87 } catch (ConstantPoolException ex) { |
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88 return false; |
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89 } |
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90 } |
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91 |
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92 private boolean matches(String cn, String name, String type) { |
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93 return methods.contains(cn + "." + name); |
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94 } |
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95 |
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96 public Boolean visitClass(CONSTANT_Class_info info, Void p) { |
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97 return false; |
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98 } |
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99 |
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100 public Boolean visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) { |
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101 return matches(info); |
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102 } |
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103 |
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104 public Boolean visitMethodref(CONSTANT_Methodref_info info, Void p) { |
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105 return matches(info); |
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106 } |
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107 |
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108 public Boolean visitDouble(CONSTANT_Double_info info, Void p) { |
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109 return false; |
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110 } |
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111 |
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112 public Boolean visitFieldref(CONSTANT_Fieldref_info info, Void p) { |
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113 return false; |
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114 } |
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115 |
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116 public Boolean visitFloat(CONSTANT_Float_info info, Void p) { |
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117 return false; |
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118 } |
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119 |
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120 public Boolean visitInteger(CONSTANT_Integer_info info, Void p) { |
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121 return false; |
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122 } |
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123 |
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124 public Boolean visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) { |
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125 return false; |
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126 } |
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127 |
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128 public Boolean visitLong(CONSTANT_Long_info info, Void p) { |
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129 return false; |
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130 } |
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131 |
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132 public Boolean visitNameAndType(CONSTANT_NameAndType_info info, Void p) { |
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133 return false; |
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134 } |
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135 |
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136 public Boolean visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) { |
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137 return false; |
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138 } |
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139 |
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140 public Boolean visitMethodType(CONSTANT_MethodType_info info, Void p) { |
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141 return false; |
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142 } |
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143 |
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144 public Boolean visitString(CONSTANT_String_info info, Void p) { |
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145 return false; |
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146 } |
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147 |
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148 public Boolean visitUtf8(CONSTANT_Utf8_info info, Void p) { |
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149 return false; |
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150 } |
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151 }; |
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152 |
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153 private Instruction.KindVisitor<Integer, List<Integer>> codeVisitor = |
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154 new Instruction.KindVisitor<Integer, List<Integer>>() |
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155 { |
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156 public Integer visitNoOperands(Instruction instr, List<Integer> p) { |
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157 return 0; |
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158 } |
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159 |
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160 public Integer visitArrayType(Instruction instr, TypeKind kind, List<Integer> p) { |
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161 return 0; |
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162 } |
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163 |
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164 public Integer visitBranch(Instruction instr, int offset, List<Integer> p) { |
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165 return 0; |
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166 } |
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167 |
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168 public Integer visitConstantPoolRef(Instruction instr, int index, List<Integer> p) { |
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169 return p.contains(index) ? index : 0; |
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170 } |
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171 |
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172 public Integer visitConstantPoolRefAndValue(Instruction instr, int index, int value, List<Integer> p) { |
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173 return p.contains(index) ? index : 0; |
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174 } |
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175 |
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176 public Integer visitLocal(Instruction instr, int index, List<Integer> p) { |
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177 return 0; |
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178 } |
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179 |
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180 public Integer visitLocalAndValue(Instruction instr, int index, int value, List<Integer> p) { |
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181 return 0; |
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182 } |
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183 |
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184 public Integer visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, List<Integer> p) { |
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185 return 0; |
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186 } |
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187 |
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188 public Integer visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, List<Integer> p) { |
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189 return 0; |
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190 } |
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191 |
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192 public Integer visitValue(Instruction instr, int value, List<Integer> p) { |
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193 return 0; |
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194 } |
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195 |
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196 public Integer visitUnknown(Instruction instr, List<Integer> p) { |
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197 return 0; |
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198 } |
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199 }; |
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200 } |
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201 |
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