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/* Soot - a J*va Optimization Framework
* Copyright (C) 1997 Clark Verbrugge
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.coffi;
import soot.*;
import java.util.StringTokenizer;
/** Base abstract class for constant pool entries; includes some utility methods.
* @see ClassFile#constant_pool
* @author Clark Verbrugge
*/
abstract class cp_info {
public static final byte CONSTANT_Utf8 = 1;
public static final byte CONSTANT_Integer = 3;
public static final byte CONSTANT_Float = 4;
public static final byte CONSTANT_Long = 5;
public static final byte CONSTANT_Double = 6;
public static final byte CONSTANT_Class = 7;
public static final byte CONSTANT_String = 8;
public static final byte CONSTANT_Fieldref = 9;
public static final byte CONSTANT_Methodref = 10;
public static final byte CONSTANT_InterfaceMethodref = 11;
public static final byte CONSTANT_NameAndType = 12;
/** One of the CONSTANT_* constants. */
public byte tag;
/** Returns the size of this entry.
* @return size (in bytes) of this entry.
*/
public abstract int size();
/** Returns a String representation of this entry.
* @param constant_pool constant pool of ClassFile.
* @return String representation of this entry.
*/
public abstract String toString(cp_info constant_pool[]);
/** Returns a String description of what kind of entry this is.
* @return String representation of this kind of entry.
*/
public abstract String typeName();
/** Compares this entry with another cp_info object (which may reside
* in a different constant pool).
* @param constant_pool constant pool of ClassFile for this.
* @param cp constant pool entry to compare against.
* @param cp_constant_pool constant pool of ClassFile for cp.
* @return a value <0, 0, or >0 indicating whether this is smaller,
* the same or larger than cp.
*/
public abstract int compareTo(cp_info constant_pool[],cp_info cp,
cp_info cp_constant_pool[]);
/** Utility method, converts two integers into a single long.
* @param high upper 32 bits of the long.
* @param low lower 32 bits of the long.
* @return a long value composed from the two ints.
*/
public static long ints2long(long high,long low) {
long h,l;
h = high; l = low;
return ((h<<32) + l);
}
/** Utility method, returns a String binary representation of the
* given integer.
* @param i the integer in question.
* @return a String of 0's and 1's.
* @see cp_info#printBits(long)
*/
public static String printBits(int i) {
String s = "";
int j,k;
k = 1;
for (j=0;j<32; j++) {
if ((i&k)!=0)
s = "1" + s;
else
s = "0" + s;
k = k<<1;
}
return s;
}
/** Utility method, returns a String binary representation of the
* given long.
* @param i the long in question.
* @return a String of 0's and 1's.
* @see cp_info#printBits(int)
*/
public static String printBits(long i) {
String s = "";
long j,k;
k = 1;
for (j=0;j<64; j++) {
if ((i&k)!=0)
s = "1" + s;
else
s = "0" + s;
k = k<<1;
}
return s;
}
/** Locates the name of the corresponding class, given the constant
* pool index of either a CONSTANT_Class, _Fieldref, Methodref or
* InterfaceMethodref.
* @param constant_pool constant pool of ClassFile.
* @param i index of cp_info entry in question.
* @return name of the associated class.
*/
public static String getClassname(cp_info constant_pool[],int i) {
cp_info c = constant_pool[i];
switch (c.tag) {
case cp_info.CONSTANT_Class:
return c.toString(constant_pool);
case cp_info.CONSTANT_Fieldref:
return getClassname(constant_pool,((CONSTANT_Fieldref_info)c).class_index);
case cp_info.CONSTANT_Methodref:
return getClassname(constant_pool,((CONSTANT_Methodref_info)c).class_index);
case cp_info.CONSTANT_InterfaceMethodref:
return getClassname(constant_pool,
((CONSTANT_InterfaceMethodref_info)c).class_index);
}
G.v().out.println("Request for classname for non-class object!");
return "Can't find classname. Sorry.";
}
/** Returns the name of the given constant pool object, assuming it is
* of type CONSTANT_NameAndType, _FieldRef, _Methodref or _InterfaceMethodref.
* @param constant_pool constant pool of ClassFile.
* @param i index of cp_info entry in question.
* @return name of the associated object.
* @see CONSTANT_Utf8_info
*/
public static String getName(cp_info constant_pool[],int i) {
cp_info c = constant_pool[i];
switch (c.tag) {
case cp_info.CONSTANT_Utf8:
return c.toString(constant_pool);
case cp_info.CONSTANT_NameAndType:
return getName(constant_pool,((CONSTANT_NameAndType_info)c).name_index);
case cp_info.CONSTANT_Fieldref:
return getName(constant_pool,((CONSTANT_Fieldref_info)c).name_and_type_index);
case cp_info.CONSTANT_Methodref:
return getName(constant_pool,((CONSTANT_Methodref_info)c).name_and_type_index);
case cp_info.CONSTANT_InterfaceMethodref:
return getName(constant_pool,
((CONSTANT_InterfaceMethodref_info)c).name_and_type_index);
}
G.v().out.println("Request for name for non-named object!");
return "Can't find name of that object. Sorry.";
}
/** Counts the number of parameters of the given method.
* @param constant_pool constant pool of ClassFile.
* @param m a constant pool index as accepted by getTypeDescr.
* @return the number of parameters.
* @see cp_info#getTypeDescr
*/
public static int countParams(cp_info constant_pool[],int m) {
StringTokenizer st;
String s = getTypeDescr(constant_pool,m);
s = ClassFile.parseMethodDesc_params(s);
st = new StringTokenizer(s,",",false);
return st.countTokens();
}
/** Returns the type descriptor for the given constant pool
* object, which must be a CONSTANT_Utf8, CONSTANT_NameAndType,
* CONSTANT_Fieldref, CONSTANT_MethodRef, or CONSTANT_InterfaceMethodRef.
* @param constant_pool constant pool of ClassFile.
* @param i a constant pool index for an entry of type CONSTANT_Utf8,
* CONSTANT_NameAndType, CONSTANT_MethodRef, or CONSTANT_InterfaceMethodRef.
* @return the type descriptor.
* @see CONSTANT_Utf8_info
*/
public static String getTypeDescr(cp_info constant_pool[],int i) {
cp_info c = constant_pool[i];
if (c instanceof CONSTANT_Utf8_info)
return c.toString(constant_pool);
if (c instanceof CONSTANT_NameAndType_info)
return getTypeDescr(constant_pool,
((CONSTANT_NameAndType_info)c).descriptor_index);
if (c instanceof CONSTANT_Methodref_info)
return getTypeDescr(constant_pool,
((CONSTANT_Methodref_info)c).name_and_type_index);
if (c instanceof CONSTANT_InterfaceMethodref_info)
return getTypeDescr(constant_pool,
((CONSTANT_InterfaceMethodref_info)c).name_and_type_index);
if (c instanceof CONSTANT_Fieldref_info)
return getTypeDescr(constant_pool,
((CONSTANT_Fieldref_info)c).name_and_type_index);
G.v().out.println("Invalid request for type descr!");
return "Invalid type descriptor request.";
}
/** Returns the name of the field type of the given constant pool object.
* @param constant_pool constant pool of ClassFile.
* @param i a constant pool index for an entry of type CONSTANT_Utf8,
* CONSTANT_NameAndType, or CONSTANT_FieldRef.
* @return the type of the field.
* @see CONSTANT_Utf8_info
* @see cp_info#getTypeDescr
*/
public static String fieldType(cp_info constant_pool[],int i) {
return ClassFile.parseDesc(getTypeDescr(constant_pool,i),"");
}
}
