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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.javaToJimple.jj.ast;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2004 Jennifer Lhotak
 * %%
 * This program 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 program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import polyglot.ast.Binary;
import polyglot.ast.Expr;
import polyglot.ext.jl.ast.Binary_c;
import polyglot.types.Type;
import polyglot.types.TypeSystem;
import polyglot.util.Position;
import polyglot.visit.AscriptionVisitor;

public class JjBinary_c extends Binary_c {

  public JjBinary_c(Position pos, Expr left, Binary.Operator op, Expr right) {
    super(pos, left, op, right);
  }

  public Type childExpectedType(Expr child, AscriptionVisitor av) {
    Expr other;

    // System.out.println("child: "+child+" op: "+op);
    if (child == left) {
      other = right;
    } else if (child == right) {
      other = left;
    } else {
      return child.type();
    }

    TypeSystem ts = av.typeSystem();

    if (op == EQ || op == NE) {
      // Coercion to compatible types.
      if (other.type().isReference() || other.type().isNull()) {
        return ts.Object();
      }

      if (other.type().isBoolean()) {
        return ts.Boolean();
      }

      if (other.type().isNumeric()) {
        if (other.type().isDouble() || child.type().isDouble()) {
          return ts.Double();
        } else if (other.type().isFloat() || child.type().isFloat()) {
          return ts.Float();
        } else if (other.type().isLong() || child.type().isLong()) {
          return ts.Long();
        } else {
          return ts.Int();
        }
      }
    }

    if (op == ADD && ts.equals(type, ts.String())) {
      // Implicit coercion to String.
      return ts.String();
    }

    if (op == GT || op == LT || op == GE || op == LE) {
      if (other.type().isBoolean()) {
        return ts.Boolean();
      }
      if (other.type().isNumeric()) {
        if (other.type().isDouble() || child.type().isDouble()) {
          return ts.Double();
        } else if (other.type().isFloat() || child.type().isFloat()) {
          return ts.Float();
        } else if (other.type().isLong() || child.type().isLong()) {
          return ts.Long();
        } else {
          return ts.Int();
        }
      }
    }

    if (op == COND_OR || op == COND_AND) {
      return ts.Boolean();
    }

    if (op == BIT_AND || op == BIT_OR || op == BIT_XOR) {
      if (other.type().isBoolean()) {
        return ts.Boolean();
      }
      if (other.type().isNumeric()) {
        if (other.type().isLong() || child.type().isLong()) {
          return ts.Long();
        } else {
          return ts.Int();
        }
      }
    }

    if (op == ADD || op == SUB || op == MUL || op == DIV || op == MOD) {
      // System.out.println("other: "+other+" type: "+other.type());
      // System.out.println("child: "+child+" child: "+child.type());

      if (other.type().isNumeric()) {
        if (other.type().isDouble() || child.type().isDouble()) {
          return ts.Double();
        } else if (other.type().isFloat() || child.type().isFloat()) {
          return ts.Float();
        } else if (other.type().isLong() || child.type().isLong()) {
          return ts.Long();
        } else {
          return ts.Int();
        }
      }
    }

    if (op == SHL || op == SHR || op == USHR) {
      if (child == right || !child.type().isLong()) {
        return ts.Int();
      } else {
        return child.type();
      }
    }

    return child.type();

  }

  /*
   * public Node foldConstants(ConstantFolder cf) { if (left instanceof Binary || left instanceof Field){ left =
   * left.del.foldConstants(cf); } if (right instanceof Binary || right instanceof Field){ right =
   * right.del.foldConstants(cf); } if (left instanceof StringLit && right instanceof StringLit) { String l = ((StringLit)
   * left).value(); String r = ((StringLit) right).value(); if (op == ADD) return nf.StringLit(position(), l + r); } else if
   * (left instanceof }
   */
}