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;
  
  import cck.text.StringUtil;
  import java.util.List;
  
  /**
   * The <code>IfStmt</code> class represents a simple branch within the IR. Since loops and switch statements
   * are not allowed, if statements (and subroutine calls) are the only form of control flow.
   *
   * @author Ben L. Titzer
   */
  public class IfStmt extends Stmt {
      /**
       * The <code>cond</code> field stores a reference to the expression that is evaluated as the condition
       * determining which branch is executed.
       */
      public final Expr cond;
  
      /**
       * The <code>trueBranch</code> field stores a reference to the list of statements to be executed if the
       * condition is true.
       */
      public final List<Stmt> trueBranch;
  
      /**
       * The <code>falseBranch</code> field stores a reference to the list of statements to be executed if the
       * condition is false.
       */
      public final List<Stmt> falseBranch;
  
      /**
       * The constructor of the <code>IfStmt</code> class simply initializes the internal fields based on the
       * parameters.
       *
       * @param c a reference to the expression representing the condition
       * @param t a reference to the list of statements to execute if the condition evaluates to true
       * @param f a reference to the list of statements to execute if the condition evaluates to false
       */
      public IfStmt(Expr c, List<Stmt> t, List<Stmt> f) {
          cond = c;
          trueBranch = t;
          falseBranch = f;
      }
  
      /**
       * 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>toString()</code> method recursively converts this statement to a string.
       *
       * @return a string representation of this statement
       */
      public String toString() {
          StringBuffer buf = new StringBuffer();
          buf.append("if ( ");
          buf.append(cond);
          buf.append(" ) {\n");
          StringUtil.linelist(buf, trueBranch);
          buf.append("} else {\n");
          StringUtil.linelist(buf, falseBranch);
          buf.append('}');
          return buf.toString();
      }
  
      /**
       * 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 r 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> r, Env env) {
          return r.visit(this, env);
      }
  
  }
  