package com.sun.org.apache.bcel.internal.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import com.sun.org.apache.bcel.internal.Constants;
import com.sun.org.apache.bcel.internal.classfile.*;
import java.io.*;
import java.util.ArrayList;
/**
* Abstract super class for all possible java types, namely basic types
* such as int, object types like String and array types, e.g. int[]
*
* @version $Id: Type.java,v 1.1.1.1 2001/10/29 20:00:28 jvanzyl Exp $
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public abstract class Type {
protected byte type;
protected String signature; // signature for the type
/** Predefined constants
*/
public static final BasicType VOID = new BasicType(Constants.T_VOID);
public static final BasicType BOOLEAN = new BasicType(Constants.T_BOOLEAN);
public static final BasicType INT = new BasicType(Constants.T_INT);
public static final BasicType SHORT = new BasicType(Constants.T_SHORT);
public static final BasicType BYTE = new BasicType(Constants.T_BYTE);
public static final BasicType LONG = new BasicType(Constants.T_LONG);
public static final BasicType DOUBLE = new BasicType(Constants.T_DOUBLE);
public static final BasicType FLOAT = new BasicType(Constants.T_FLOAT);
public static final BasicType CHAR = new BasicType(Constants.T_CHAR);
public static final ObjectType OBJECT = new ObjectType("java.lang.Object");
public static final ObjectType STRING = new ObjectType("java.lang.String");
public static final ObjectType STRINGBUFFER = new ObjectType("java.lang.StringBuffer");
public static final ObjectType THROWABLE = new ObjectType("java.lang.Throwable");
public static final Type[] NO_ARGS = new Type[0];
public static final ReferenceType NULL = new ReferenceType();
public static final Type UNKNOWN = new Type(Constants.T_UNKNOWN,
"<unknown object>"){};
protected Type(byte t, String s) {
type = t;
signature = s;
}
/**
* @return signature for given type.
*/
public String getSignature() { return signature; }
/**
* @return type as defined in Constants
*/
public byte getType() { return type; }
/**
* @return stack size of this type (2 for long and double, 0 for void, 1 otherwise)
*/
public int getSize() {
switch(type) {
case Constants.T_DOUBLE:
case Constants.T_LONG: return 2;
case Constants.T_VOID: return 0;
default: return 1;
}
}
/**
* @return Type string, e.g. `int[]'
*/
public String toString() {
return ((this.equals(Type.NULL) || (type >= Constants.T_UNKNOWN)))? signature :
Utility.signatureToString(signature, false);
}
/**
* Convert type to Java method signature, e.g. int[] f(java.lang.String x)
* becomes (Ljava/lang/String;)[I
*
* @param return_type what the method returns
* @param arg_types what are the argument types
* @return method signature for given type(s).
*/
public static String getMethodSignature(Type return_type, Type[] arg_types) {
StringBuffer buf = new StringBuffer("(");
int length = (arg_types == null)? 0 : arg_types.length;
for(int i=0; i < length; i++)
buf.append(arg_types[i].getSignature());
buf.append(')');
buf.append(return_type.getSignature());
return buf.toString();
}
private static int consumed_chars=0; // Remember position in string, see getArgumentTypes
/**
* Convert signature to a Type object.
* @param signature signature string such as Ljava/lang/String;
* @return type object
*/
public static final Type getType(String signature)
throws StringIndexOutOfBoundsException
{
byte type = Utility.typeOfSignature(signature);
if(type <= Constants.T_VOID) {
consumed_chars = 1;
return BasicType.getType(type);
} else if(type == Constants.T_ARRAY) {
int dim=0;
do { // Count dimensions
dim++;
} while(signature.charAt(dim) == '[');
// Recurse, but just once, if the signature is ok
Type t = getType(signature.substring(dim));
consumed_chars += dim; // update counter
return new ArrayType(t, dim);
} else { // type == T_REFERENCE
int index = signature.indexOf(';'); // Look for closing `;'
if(index < 0)
throw new ClassFormatError("Invalid signature: " + signature);
consumed_chars = index + 1; // "Lblabla;" `L' and `;' are removed
return new ObjectType(signature.substring(1, index).replace('/', '.'));
}
}
/**
* Convert return value of a method (signature) to a Type object.
*
* @param signature signature string such as (Ljava/lang/String;)V
* @return return type
*/
public static Type getReturnType(String signature) {
try {
// Read return type after `)'
int index = signature.lastIndexOf(')') + 1;
return getType(signature.substring(index));
} catch(StringIndexOutOfBoundsException e) { // Should never occur
throw new ClassFormatError("Invalid method signature: " + signature);
}
}
/**
* Convert arguments of a method (signature) to an array of Type objects.
* @param signature signature string such as (Ljava/lang/String;)V
* @return array of argument types
*/
public static Type[] getArgumentTypes(String signature) {
ArrayList vec = new ArrayList();
int index;
Type[] types;
try { // Read all declarations between for `(' and `)'
if(signature.charAt(0) != '(')
throw new ClassFormatError("Invalid method signature: " + signature);
index = 1; // current string position
while(signature.charAt(index) != ')') {
vec.add(getType(signature.substring(index)));
index += consumed_chars; // update position
}
} catch(StringIndexOutOfBoundsException e) { // Should never occur
throw new ClassFormatError("Invalid method signature: " + signature);
}
types = new Type[vec.size()];
vec.toArray(types);
return types;
}
}
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