1 /*

     2  * Copyright (c) 2007, 2008, Oracle and/or its affiliates. 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package com.sun.tools.classfile;

    27 

    28 import java.util.ArrayList;

    29 import java.util.List;

    30 import com.sun.tools.classfile.Type.*;

    31 

    32 /**

    33  * See JVMS 4.4.4.

    34  *

    35  *  <p><b>This is NOT part of any supported API.

    36  *  If you write code that depends on this, you do so at your own risk.

    37  *  This code and its internal interfaces are subject to change or

    38  *  deletion without notice.</b>

    39  */

    40 public class Signature extends Descriptor {

    41 

    42     public Signature(int index) {

    43         super(index);

    44     }

    45 

    46     public Type getType(ConstantPool constant_pool) throws ConstantPoolException {

    47         if (type == null)

    48             type = parse(getValue(constant_pool));

    49         return type;

    50     }

    51 

    52     @Override

    53     public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException {

    54         MethodType m = (MethodType) getType(constant_pool);

    55         return m.paramTypes.size();

    56     }

    57 

    58     @Override

    59     public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException {

    60         MethodType m = (MethodType) getType(constant_pool);

    61         StringBuilder sb = new StringBuilder();

    62         sb.append("(");

    63         String sep = "";

    64         for (Type paramType: m.paramTypes) {

    65             sb.append(sep);

    66             sb.append(paramType);

    67             sep = ", ";

    68         }

    69         sb.append(")");

    70         return sb.toString();

    71     }

    72 

    73     @Override

    74     public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException {

    75         MethodType m = (MethodType) getType(constant_pool);

    76         return m.returnType.toString();

    77     }

    78 

    79     @Override

    80     public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException {

    81         return getType(constant_pool).toString();

    82     }

    83 

    84     private Type parse(String sig) {

    85         this.sig = sig;

    86         sigp = 0;

    87 

    88         List<TypeParamType> typeParamTypes = null;

    89         if (sig.charAt(sigp) == '<')

    90             typeParamTypes = parseTypeParamTypes();

    91 

    92         if (sig.charAt(sigp) == '(') {

    93             List<Type> paramTypes = parseTypeSignatures(')');

    94             Type returnType = parseTypeSignature();

    95             List<Type> throwsTypes = null;

    96             while (sigp < sig.length() && sig.charAt(sigp) == '^') {

    97                 sigp++;

    98                 if (throwsTypes == null)

    99                     throwsTypes = new ArrayList<>();

   100                 throwsTypes.add(parseTypeSignature());

   101             }

   102             return new MethodType(typeParamTypes, paramTypes, returnType, throwsTypes);

   103         } else {

   104             Type t = parseTypeSignature();

   105             if (typeParamTypes == null && sigp == sig.length())

   106                 return t;

   107             Type superclass = t;

   108             List<Type> superinterfaces = null;

   109             while (sigp < sig.length()) {

   110                 if (superinterfaces == null)

   111                     superinterfaces = new ArrayList<>();

   112                 superinterfaces.add(parseTypeSignature());

   113             }

   114             return new ClassSigType(typeParamTypes, superclass, superinterfaces);

   115 

   116         }

   117     }

   118 

   119     private Type parseTypeSignature() {

   120         switch (sig.charAt(sigp)) {

   121             case 'B':

   122                 sigp++;

   123                 return new SimpleType("byte");

   124 

   125             case 'C':

   126                 sigp++;

   127                 return new SimpleType("char");

   128 

   129             case 'D':

   130                 sigp++;

   131                 return new SimpleType("double");

   132 

   133             case 'F':

   134                 sigp++;

   135                 return new SimpleType("float");

   136 

   137             case 'I':

   138                 sigp++;

   139                 return new SimpleType("int");

   140 

   141             case 'J':

   142                 sigp++;

   143                 return new SimpleType("long");

   144 

   145             case 'L':

   146                 return parseClassTypeSignature();

   147 

   148             case 'S':

   149                 sigp++;

   150                 return new SimpleType("short");

   151 

   152             case 'T':

   153                 return parseTypeVariableSignature();

   154 

   155             case 'V':

   156                 sigp++;

   157                 return new SimpleType("void");

   158 

   159             case 'Z':

   160                 sigp++;

   161                 return new SimpleType("boolean");

   162 

   163             case '[':

   164                 sigp++;

   165                 return new ArrayType(parseTypeSignature());

   166 

   167             case '*':

   168                 sigp++;

   169                 return new WildcardType();

   170 

   171             case '+':

   172                 sigp++;

   173                 return new WildcardType(WildcardType.Kind.EXTENDS, parseTypeSignature());

   174 

   175             case '-':

   176                 sigp++;

   177                 return new WildcardType(WildcardType.Kind.SUPER, parseTypeSignature());

   178 

   179             default:

   180                 throw new IllegalStateException(debugInfo());

   181         }

   182     }

   183 

   184     private List<Type> parseTypeSignatures(char term) {

   185         sigp++;

   186         List<Type> types = new ArrayList<>();

   187         while (sig.charAt(sigp) != term)

   188             types.add(parseTypeSignature());

   189         sigp++;

   190         return types;

   191     }

   192 

   193     private Type parseClassTypeSignature() {

   194         assert sig.charAt(sigp) == 'L';

   195         sigp++;

   196         return parseClassTypeSignatureRest();

   197     }

   198 

   199     private Type parseClassTypeSignatureRest() {

   200         StringBuilder sb = new StringBuilder();

   201         List<Type> argTypes = null;

   202         ClassType t = null;

   203         char sigch ;

   204 

   205         do {

   206             switch  (sigch = sig.charAt(sigp)) {

   207                 case '<':

   208                     argTypes = parseTypeSignatures('>');

   209                     break;

   210 

   211                 case '.':

   212                 case ';':

   213                     sigp++;

   214                     t = new ClassType(t, sb.toString(), argTypes);

   215                     sb.setLength(0);

   216                     argTypes = null;

   217                     break;

   218 

   219                 default:

   220                     sigp++;

   221                     sb.append(sigch);

   222                     break;

   223             }

   224         } while (sigch != ';');

   225 

   226         return t;

   227     }

   228 

   229     private List<TypeParamType> parseTypeParamTypes() {

   230         assert sig.charAt(sigp) == '<';

   231         sigp++;

   232         List<TypeParamType> types = new ArrayList<>();

   233         while (sig.charAt(sigp) != '>')

   234             types.add(parseTypeParamType());

   235         sigp++;

   236         return types;

   237     }

   238 

   239     private TypeParamType parseTypeParamType() {

   240         int sep = sig.indexOf(":", sigp);

   241         String name = sig.substring(sigp, sep);

   242         Type classBound = null;

   243         List<Type> interfaceBounds = null;

   244         sigp = sep + 1;

   245         if (sig.charAt(sigp) != ':')

   246             classBound = parseTypeSignature();

   247         while (sig.charAt(sigp) == ':') {

   248             sigp++;

   249             if (interfaceBounds == null)

   250                 interfaceBounds = new ArrayList<>();

   251             interfaceBounds.add(parseTypeSignature());

   252         }

   253         return new TypeParamType(name, classBound, interfaceBounds);

   254     }

   255 

   256     private Type parseTypeVariableSignature() {

   257         sigp++;

   258         int sep = sig.indexOf(';', sigp);

   259         Type t = new SimpleType(sig.substring(sigp, sep));

   260         sigp = sep + 1;

   261         return t;

   262     }

   263 

   264     private String debugInfo() {

   265         return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1);

   266     }

   267 

   268     private String sig;

   269     private int sigp;

   270 

   271     private Type type;

   272 }