returnnode.java

一个JAVA编写的简单编译器

package ast.statement;

public class ReturnNode extends StatementNode {
  private ast.IJSubNode expr = null;
  private ast.declaration.StaticMethod method = null;
  public ReturnNode (ast.IJSubNode expr, ast.declaration.StaticMethod method) {
    this.expr = expr;
    this.method = method;
  }
  public String toString (String prefix) {
    return prefix + "return";
  }
  public void dump(String prefix) {
    System.out.println(toString(prefix));
    System.out.println (method.getName ());
    if (expr != null)
      expr.dump (prefix + "  ");
  }
  public void codegen () {
    if (expr != null)
      expr.codegen ();
    String type = "";
    if (method.getType ().equals ("I"))
      type = "i";
    codegen.WriteCode.genInstruction (type + "return");
  }  
  public int getDepth () {
    if (expr == null)
      return 0;
    else
      return expr.getDepth ();
  }
  public String getXMLType () {
    return "return";
  }
  public void genXML (java.io.PrintStream p, String prefix) {
    p.println (prefix + "<return>");
   if (expr != null)
      expr.genXML (p, prefix);
   p.println (prefix + "</return>");
 }   
}