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1 /* |
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2 * Copyright (c) 2007, 2008, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.classfile; |
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27 |
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28 import java.util.ArrayList; |
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29 import java.util.List; |
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30 import com.sun.tools.classfile.Type.*; |
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31 |
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32 /** |
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33 * See JVMS 4.4.4. |
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34 * |
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35 * <p><b>This is NOT part of any supported API. |
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36 * If you write code that depends on this, you do so at your own risk. |
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37 * This code and its internal interfaces are subject to change or |
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38 * deletion without notice.</b> |
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39 */ |
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40 public class Signature extends Descriptor { |
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41 |
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42 public Signature(int index) { |
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43 super(index); |
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44 } |
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45 |
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46 public Type getType(ConstantPool constant_pool) throws ConstantPoolException { |
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47 if (type == null) |
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48 type = parse(getValue(constant_pool)); |
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49 return type; |
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50 } |
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51 |
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52 @Override |
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53 public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException { |
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54 MethodType m = (MethodType) getType(constant_pool); |
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55 return m.paramTypes.size(); |
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56 } |
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57 |
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58 @Override |
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59 public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException { |
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60 MethodType m = (MethodType) getType(constant_pool); |
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61 StringBuilder sb = new StringBuilder(); |
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62 sb.append("("); |
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63 String sep = ""; |
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64 for (Type paramType: m.paramTypes) { |
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65 sb.append(sep); |
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66 sb.append(paramType); |
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67 sep = ", "; |
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68 } |
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69 sb.append(")"); |
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70 return sb.toString(); |
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71 } |
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72 |
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73 @Override |
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74 public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException { |
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75 MethodType m = (MethodType) getType(constant_pool); |
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76 return m.returnType.toString(); |
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77 } |
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78 |
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79 @Override |
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80 public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException { |
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81 return getType(constant_pool).toString(); |
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82 } |
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83 |
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84 private Type parse(String sig) { |
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85 this.sig = sig; |
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86 sigp = 0; |
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87 |
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88 List<TypeParamType> typeParamTypes = null; |
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89 if (sig.charAt(sigp) == '<') |
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90 typeParamTypes = parseTypeParamTypes(); |
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91 |
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92 if (sig.charAt(sigp) == '(') { |
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93 List<Type> paramTypes = parseTypeSignatures(')'); |
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94 Type returnType = parseTypeSignature(); |
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95 List<Type> throwsTypes = null; |
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96 while (sigp < sig.length() && sig.charAt(sigp) == '^') { |
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97 sigp++; |
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98 if (throwsTypes == null) |
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99 throwsTypes = new ArrayList<>(); |
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100 throwsTypes.add(parseTypeSignature()); |
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101 } |
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102 return new MethodType(typeParamTypes, paramTypes, returnType, throwsTypes); |
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103 } else { |
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104 Type t = parseTypeSignature(); |
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105 if (typeParamTypes == null && sigp == sig.length()) |
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106 return t; |
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107 Type superclass = t; |
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108 List<Type> superinterfaces = null; |
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109 while (sigp < sig.length()) { |
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110 if (superinterfaces == null) |
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111 superinterfaces = new ArrayList<>(); |
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112 superinterfaces.add(parseTypeSignature()); |
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113 } |
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114 return new ClassSigType(typeParamTypes, superclass, superinterfaces); |
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115 |
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116 } |
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117 } |
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118 |
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119 private Type parseTypeSignature() { |
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120 switch (sig.charAt(sigp)) { |
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121 case 'B': |
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122 sigp++; |
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123 return new SimpleType("byte"); |
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124 |
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125 case 'C': |
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126 sigp++; |
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127 return new SimpleType("char"); |
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128 |
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129 case 'D': |
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130 sigp++; |
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131 return new SimpleType("double"); |
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132 |
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133 case 'F': |
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134 sigp++; |
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135 return new SimpleType("float"); |
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136 |
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137 case 'I': |
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138 sigp++; |
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139 return new SimpleType("int"); |
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140 |
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141 case 'J': |
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142 sigp++; |
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143 return new SimpleType("long"); |
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144 |
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145 case 'L': |
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146 return parseClassTypeSignature(); |
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147 |
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148 case 'S': |
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149 sigp++; |
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150 return new SimpleType("short"); |
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151 |
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152 case 'T': |
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153 return parseTypeVariableSignature(); |
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154 |
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155 case 'V': |
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156 sigp++; |
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157 return new SimpleType("void"); |
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158 |
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159 case 'Z': |
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160 sigp++; |
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161 return new SimpleType("boolean"); |
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162 |
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163 case '[': |
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164 sigp++; |
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165 return new ArrayType(parseTypeSignature()); |
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166 |
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167 case '*': |
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168 sigp++; |
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169 return new WildcardType(); |
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170 |
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171 case '+': |
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172 sigp++; |
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173 return new WildcardType(WildcardType.Kind.EXTENDS, parseTypeSignature()); |
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174 |
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175 case '-': |
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176 sigp++; |
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177 return new WildcardType(WildcardType.Kind.SUPER, parseTypeSignature()); |
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178 |
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179 default: |
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180 throw new IllegalStateException(debugInfo()); |
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181 } |
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182 } |
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183 |
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184 private List<Type> parseTypeSignatures(char term) { |
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185 sigp++; |
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186 List<Type> types = new ArrayList<>(); |
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187 while (sig.charAt(sigp) != term) |
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188 types.add(parseTypeSignature()); |
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189 sigp++; |
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190 return types; |
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191 } |
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192 |
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193 private Type parseClassTypeSignature() { |
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194 assert sig.charAt(sigp) == 'L'; |
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195 sigp++; |
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196 return parseClassTypeSignatureRest(); |
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197 } |
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198 |
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199 private Type parseClassTypeSignatureRest() { |
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200 StringBuilder sb = new StringBuilder(); |
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201 List<Type> argTypes = null; |
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202 ClassType t = null; |
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203 char sigch ; |
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204 |
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205 do { |
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206 switch (sigch = sig.charAt(sigp)) { |
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207 case '<': |
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208 argTypes = parseTypeSignatures('>'); |
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209 break; |
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210 |
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211 case '.': |
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212 case ';': |
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213 sigp++; |
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214 t = new ClassType(t, sb.toString(), argTypes); |
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215 sb.setLength(0); |
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216 argTypes = null; |
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217 break; |
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218 |
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219 default: |
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220 sigp++; |
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221 sb.append(sigch); |
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222 break; |
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223 } |
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224 } while (sigch != ';'); |
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225 |
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226 return t; |
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227 } |
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228 |
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229 private List<TypeParamType> parseTypeParamTypes() { |
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230 assert sig.charAt(sigp) == '<'; |
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231 sigp++; |
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232 List<TypeParamType> types = new ArrayList<>(); |
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233 while (sig.charAt(sigp) != '>') |
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234 types.add(parseTypeParamType()); |
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235 sigp++; |
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236 return types; |
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237 } |
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238 |
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239 private TypeParamType parseTypeParamType() { |
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240 int sep = sig.indexOf(":", sigp); |
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241 String name = sig.substring(sigp, sep); |
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242 Type classBound = null; |
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243 List<Type> interfaceBounds = null; |
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244 sigp = sep + 1; |
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245 if (sig.charAt(sigp) != ':') |
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246 classBound = parseTypeSignature(); |
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247 while (sig.charAt(sigp) == ':') { |
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248 sigp++; |
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249 if (interfaceBounds == null) |
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250 interfaceBounds = new ArrayList<>(); |
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251 interfaceBounds.add(parseTypeSignature()); |
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252 } |
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253 return new TypeParamType(name, classBound, interfaceBounds); |
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254 } |
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255 |
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256 private Type parseTypeVariableSignature() { |
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257 sigp++; |
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258 int sep = sig.indexOf(';', sigp); |
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259 Type t = new SimpleType(sig.substring(sigp, sep)); |
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260 sigp = sep + 1; |
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261 return t; |
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262 } |
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263 |
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264 private String debugInfo() { |
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265 return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1); |
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266 } |
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267 |
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268 private String sig; |
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269 private int sigp; |
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270 |
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271 private Type type; |
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272 } |