code: /**
   * Copyright (c) 2004-2005, Regents of the University of California
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * 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.
   *
   * Neither the name of the University of California, Los Angeles nor the
   * names of its contributors may be used to endorse or promote products
   * derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS 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 COPYRIGHT
   * OWNER OR 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.
   */
  
  package jintgen.jigir;
  
  /**
   * The <code>AssignStmt</code> class represents an assignment statement in the IR. This is an abstract class
   * whose subclasses represent the different cases of assignments: assignments to locals, to maps, and to
   * ranges of bits, individual bits, etc.
   *
   * @author Ben L. Titzer
   */
  public class AssignStmt extends Stmt {
  
      /**
       * The <code>dest</code> field stores a reference to the expression (which must be an Lvalue)
       * that specifies the location to store the value to.
       */
      public final Expr dest;
  
      /**
       * The <code>expr</code> field stores a reference to the expression whose result is assigned to the left
       * hand side.
       */
      public final Expr expr;
  
      /**
       * The constructor of the <code>AssignStmt</code> class simply stores a reference to the right hand side
       * expression internally.
       *
       * @param r the expression representing the right hand side of the assignment
       */
      public AssignStmt(Expr d, Expr r) {
          dest = d;
          expr = r;
      }
  
      /**
       * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
       * syntax trees representing the code of a particular instruction or subroutine.
       *
       * @param v the visitor to accept
       */
      public void accept(StmtVisitor v) {
          v.visit(this);
      }
  
      /**
       * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
       * syntax trees representing the code of a particular instruction or subroutine. The
       * <code>StmtRebuilder</code> interface allows visitors to rearrange and rebuild the statements.
       *
       * @param v the visitor to accept
       * @return the result of calling the appropriate <code>visit()</code> of the rebuilder passed
       */
      public <Res, Env> Res accept(StmtAccumulator<Res,Env> v, Env env) {
          return v.visit(this, env);
      }
  
      public static class Var extends Stmt {
          public final VarExpr dest;
          public final Expr expr;
  
          public Var(VarExpr d, Expr e) {
              dest = d;
              expr = e;
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine.
           *
           * @param v the visitor to accept
           */
          public void accept(StmtVisitor v) {
              v.visit(this);
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine. The
           * <code>StmtRebuilder</code> interface allows visitors to rearrange and rebuild the statements.
           *
           * @param v the visitor to accept
           * @return the result of calling the appropriate <code>visit()</code> of the rebuilder passed
           */
          public <Res, Env> Res accept(StmtAccumulator<Res,Env> v, Env env) {
              return v.visit(this, env);
          }
      }
  
      public static class Map extends Stmt {
          public final Expr map;
          public final Expr index;
          public final Expr expr;
  
          public Map(Expr m, Expr i, Expr e) {
              map = m;
              index = i;
              expr = e;
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine.
           *
           * @param v the visitor to accept
           */
          public void accept(StmtVisitor v) {
              v.visit(this);
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine. The
           * <code>StmtRebuilder</code> interface allows visitors to rearrange and rebuild the statements.
           *
           * @param v the visitor to accept
           * @return the result of calling the appropriate <code>visit()</code> of the rebuilder passed
           */
          public <Res, Env> Res accept(StmtAccumulator<Res,Env> v, Env env) {
              return v.visit(this, env);
          }
      }
  
      public static class Bit extends Stmt {
          public final VarExpr dest;
          public final Expr bit;
          public final Expr expr;
  
          public Bit(VarExpr d, Expr b, Expr e) {
              dest = d;
              bit = b;
              expr = e;
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine.
           *
           * @param v the visitor to accept
           */
          public void accept(StmtVisitor v) {
              v.visit(this);
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine. The
           * <code>StmtRebuilder</code> interface allows visitors to rearrange and rebuild the statements.
           *
           * @param v the visitor to accept
           * @return the result of calling the appropriate <code>visit()</code> of the rebuilder passed
           */
          public <Res, Env> Res accept(StmtAccumulator<Res,Env> v, Env env) {
              return v.visit(this, env);
          }
      }
  
      public static class FixedRange extends Stmt {
          public final VarExpr dest;
          public final int low_bit;
          public final int high_bit;
          public final Expr expr;
  
          public FixedRange(VarExpr d, int l, int h, Expr e) {
              dest = d;
              low_bit = l;
              high_bit = h;
              expr = e;
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine.
           *
           * @param v the visitor to accept
           */
          public void accept(StmtVisitor v) {
              v.visit(this);
          }
  
          /**
           * The <code>accept()</code> method implements one half of the visitor pattern for visiting the abstract
           * syntax trees representing the code of a particular instruction or subroutine. The
           * <code>StmtRebuilder</code> interface allows visitors to rearrange and rebuild the statements.
           *
           * @param v the visitor to accept
           * @return the result of calling the appropriate <code>visit()</code> of the rebuilder passed
           */
          public <Res, Env> Res accept(StmtAccumulator<Res,Env> v, Env env) {
              return v.visit(this, env);
          }
      }
  }
  