1 /* 2 * Copyright 2002-2008 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Sun designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Sun in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 22 * CA 95054 USA or visit www.sun.com if you need additional information or 23 * have any questions. 24 */ 25 26 27 package com.sun.tools.javah; 28 29 import java.util.*; 30 import javax.lang.model.element.Name; 31 import javax.lang.model.element.TypeElement; 32 import javax.lang.model.type.ArrayType; 33 import javax.lang.model.type.DeclaredType; 34 import javax.lang.model.type.NoType; 35 import javax.lang.model.type.PrimitiveType; 36 import javax.lang.model.type.TypeKind; 37 import javax.lang.model.type.TypeMirror; 38 import javax.lang.model.type.TypeVariable; 39 import javax.lang.model.type.TypeVisitor; 40 import javax.lang.model.util.Elements; 41 import javax.lang.model.util.SimpleTypeVisitor6; 42 43 /** 44 * Returns internal type signature. 45 * 46 * <p><b>This is NOT part of any API supported by Sun Microsystems. 47 * If you write code that depends on this, you do so at your own 48 * risk. This code and its internal interfaces are subject to change 49 * or deletion without notice.</b></p> 50 * 51 * @author Sucheta Dambalkar 52 */ 53 54 public class TypeSignature{ 55 56 Elements elems; 57 58 /* Signature Characters */ 59 60 private static final String SIG_VOID = "V"; 61 private static final String SIG_BOOLEAN = "Z"; 62 private static final String SIG_BYTE = "B"; 63 private static final String SIG_CHAR = "C"; 64 private static final String SIG_SHORT = "S"; 65 private static final String SIG_INT = "I"; 66 private static final String SIG_LONG = "J"; 67 private static final String SIG_FLOAT = "F"; 68 private static final String SIG_DOUBLE = "D"; 69 private static final String SIG_ARRAY = "["; 70 private static final String SIG_CLASS = "L"; 71 72 73 74 public TypeSignature(Elements elems){ 75 this.elems = elems; 76 } 77 78 /* 79 * Returns the type signature of a field according to JVM specs 80 */ 81 public String getTypeSignature(String javasignature){ 82 return getParamJVMSignature(javasignature); 83 } 84 85 /* 86 * Returns the type signature of a method according to JVM specs 87 */ 88 public String getTypeSignature(String javasignature, TypeMirror returnType){ 89 String signature = null; //Java type signature. 90 String typeSignature = null; //Internal type signature. 91 List<String> params = new ArrayList<String>(); //List of parameters. 92 String paramsig = null; //Java parameter signature. 93 String paramJVMSig = null; //Internal parameter signature. 94 String returnSig = null; //Java return type signature. 95 String returnJVMType = null; //Internal return type signature. 96 int dimensions = 0; //Array dimension. 97 98 int startIndex = -1; 99 int endIndex = -1; 100 StringTokenizer st = null; 101 int i = 0; 102 103 // Gets the actual java signature without parentheses. 104 if (javasignature != null) { 105 startIndex = javasignature.indexOf("("); 106 endIndex = javasignature.indexOf(")"); 107 } 108 109 if (((startIndex != -1) && (endIndex != -1)) 110 &&(startIndex+1 < javasignature.length()) 111 &&(endIndex < javasignature.length())) { 112 signature = javasignature.substring(startIndex+1, endIndex); 113 } 114 115 // Separates parameters. 116 if (signature != null) { 117 if (signature.indexOf(",") != -1) { 118 st = new StringTokenizer(signature, ","); 119 if (st != null) { 120 while (st.hasMoreTokens()) { 121 params.add(st.nextToken()); 122 } 123 } 124 } else { 125 params.add(signature); 126 } 127 } 128 129 /* JVM type signature. */ 130 typeSignature = "("; 131 132 // Gets indivisual internal parameter signature. 133 while (params.isEmpty() != true) { 134 paramsig = params.remove(i).trim(); 135 paramJVMSig = getParamJVMSignature(paramsig); 136 if (paramJVMSig != null) { 137 typeSignature += paramJVMSig; 138 } 139 } 140 141 typeSignature += ")"; 142 143 // Get internal return type signature. 144 145 returnJVMType = ""; 146 if (returnType != null) { 147 dimensions = dimensions(returnType); 148 } 149 150 //Gets array dimension of return type. 151 while (dimensions-- > 0) { 152 returnJVMType += "["; 153 } 154 if (returnType != null) { 155 returnSig = qualifiedTypeName(returnType); 156 returnJVMType += getComponentType(returnSig); 157 } else { 158 System.out.println("Invalid return type."); 159 } 160 161 typeSignature += returnJVMType; 162 163 return typeSignature; 164 } 165 166 /* 167 * Returns internal signature of a parameter. 168 */ 169 private String getParamJVMSignature(String paramsig) { 170 String paramJVMSig = ""; 171 String componentType =""; 172 173 if(paramsig != null){ 174 175 if(paramsig.indexOf("[]") != -1) { 176 // Gets array dimension. 177 int endindex = paramsig.indexOf("[]"); 178 componentType = paramsig.substring(0, endindex); 179 String dimensionString = paramsig.substring(endindex); 180 if(dimensionString != null){ 181 while(dimensionString.indexOf("[]") != -1){ 182 paramJVMSig += "["; 183 int beginindex = dimensionString.indexOf("]") + 1; 184 if(beginindex < dimensionString.length()){ 185 dimensionString = dimensionString.substring(beginindex); 186 }else 187 dimensionString = ""; 188 } 189 } 190 } else componentType = paramsig; 191 192 paramJVMSig += getComponentType(componentType); 193 } 194 return paramJVMSig; 195 } 196 197 /* 198 * Returns internal signature of a component. 199 */ 200 private String getComponentType(String componentType){ 201 202 String JVMSig = ""; 203 204 if(componentType != null){ 205 if(componentType.equals("void")) JVMSig += SIG_VOID ; 206 else if(componentType.equals("boolean")) JVMSig += SIG_BOOLEAN ; 207 else if(componentType.equals("byte")) JVMSig += SIG_BYTE ; 208 else if(componentType.equals("char")) JVMSig += SIG_CHAR ; 209 else if(componentType.equals("short")) JVMSig += SIG_SHORT ; 210 else if(componentType.equals("int")) JVMSig += SIG_INT ; 211 else if(componentType.equals("long")) JVMSig += SIG_LONG ; 212 else if(componentType.equals("float")) JVMSig += SIG_FLOAT ; 213 else if(componentType.equals("double")) JVMSig += SIG_DOUBLE ; 214 else { 215 if(!componentType.equals("")){ 216 TypeElement classNameDoc = elems.getTypeElement(componentType); 217 218 if(classNameDoc == null){ 219 System.out.println("Invalid class type for " + componentType); 220 new Exception().printStackTrace(); 221 }else { 222 String classname = classNameDoc.getQualifiedName().toString(); 223 String newclassname = classname.replace('.', '/'); 224 JVMSig += "L"; 225 JVMSig += newclassname; 226 JVMSig += ";"; 227 } 228 } 229 } 230 } 231 return JVMSig; 232 } 233 234 int dimensions(TypeMirror t) { 235 if (t.getKind() != TypeKind.ARRAY) 236 return 0; 237 return 1 + dimensions(((ArrayType) t).getComponentType()); 238 } 239 240 241 String qualifiedTypeName(TypeMirror type) { 242 TypeVisitor<Name, Void> v = new SimpleTypeVisitor6<Name, Void>() { 243 @Override 244 public Name visitArray(ArrayType t, Void p) { 245 return t.getComponentType().accept(this, p); 246 } 247 248 @Override 249 public Name visitDeclared(DeclaredType t, Void p) { 250 return ((TypeElement) t.asElement()).getQualifiedName(); 251 } 252 253 @Override 254 public Name visitPrimitive(PrimitiveType t, Void p) { 255 return elems.getName(t.toString()); 256 } 257 258 @Override 259 public Name visitNoType(NoType t, Void p) { 260 if (t.getKind() == TypeKind.VOID) 261 return elems.getName("void"); 262 return defaultAction(t, p); 263 } 264 265 @Override 266 public Name visitTypeVariable(TypeVariable t, Void p) { 267 return t.getUpperBound().accept(this, p); 268 } 269 }; 270 return v.visit(type).toString(); 271 } 272 }