subnode.java

来自「一个JAVA编写的简单编译器」· Java 代码 · 共 29 行

package ast.binaryExpr;


public class SubNode extends ast.JSubNode {
  
  public SubNode (ast.IJSubNode n) {
    super (n);
  }
  
  public String toString () {
    return "-";
  }    
  
  public void codegen () {
    int k = getNumChildren ();
    ast.IJSubNode value = (ast.IJSubNode)getChild (0);
    value.codegen ();
    for (int i = 1; i < k; i++) {
      ast.IJSubNode nextvalue = (ast.IJSubNode)getChild (i);
      nextvalue.codegen ();
      codegen.WriteCode.genInstruction ("isub");
    }      
  }  
  
  public String getXMLType () {
    return "sub";
  }
}