/* 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;
/** A debugging attribute, this gives the names of local variables
* within blocks of bytecode.
* @see attribute_info
* @author Clark Verbrugge
*/
class LocalVariableTable_attribute extends attribute_info {
/** Length of the local variable table. */
public int local_variable_table_length;
/** Actual table of local variables. */
public local_variable_table_entry local_variable_table[];
/** Locates the first name found for a given local variable.
* @param constant_pool constant pool for the associated class.
* @param idx local variable index.
* @return name of the local variable, or <i>null</i> if not found.
* @see LocalVariableTable_attribute#getLocalVariableName(cp_info[], int, int)
*/
public String getLocalVariableName(cp_info constant_pool[],int idx) {
return getLocalVariableName(constant_pool,idx,-1);
}
/** Locates the name of the given local variable for the specified code offset.
* @param constant_pool constant pool for the associated class.
* @param idx local variable index.
* @param code code offset for variable name; use -1 to return the first name found
* for that local variable.
* @return name of the local variable, or <i>null</i> if not found.
* @see LocalVariableTable_attribute#getLocalVariableName(cp_info[], int)
*/
public String getLocalVariableName(cp_info constant_pool[],int idx,int code) {
local_variable_table_entry e;
int i;
// G.v().out.println("searching for name of local: " + idx + "at: " + code);
// now to find that variable
for (i=0;i<local_variable_table_length;i++) {
e = local_variable_table[i];
if (e.index==idx &&
(code==-1 ||
(code>=e.start_pc && code<=e.start_pc+e.length))){
// (code>=e.start_pc && code<e.start_pc+e.length))) {
// found the variable, now find its name.
//G.v().out.println("found entry: " + i);
if (constant_pool[e.name_index] instanceof CONSTANT_Utf8_info)
{
String n = ((CONSTANT_Utf8_info)(constant_pool[e.name_index])).convert();
if (Util.v().isValidJimpleName(n))
return n;
else
return null;
}
else {
throw new RuntimeException( "What? A local variable table "
+"name_index isn't a UTF8 entry?");
}
}
}
return null;
}
public String toString()
{
StringBuffer buffer = new StringBuffer();
for(int i = 0; i < local_variable_table_length; i++)
{
buffer.append(local_variable_table[i].toString() + "\n");
}
return buffer.toString();
}
}