FunctionEnvironment.java

import java.util.Vector;

public class FunctionEnvironment {

    static final int TABLESIZE = 503;

    public FunctionEnvironment() {
	htable = new HashTable(TABLESIZE);
    }

    public FunctionEntry find(String key) {
	return (FunctionEntry) htable.find(key);
    }

    public int size() {
	return htable.numelements();
    }


    public void addBuiltinFunctions() {
	Vector formals;
	formals = new Vector(0);
	htable.insert("Read", new FunctionEntry(IntegerType.instance(), formals, 
						   Label.AbsLabel("Read"), Label.AbsLabel("Readend")));
	htable.insert("Println", new FunctionEntry(VoidType.instance(), formals, 
						   Label.AbsLabel("Println"), Label.AbsLabel("Printlnend")));

	formals = new Vector(1);
	formals.addElement(IntegerType.instance());
	htable.insert("Print", new FunctionEntry(VoidType.instance(),formals,
						   Label.AbsLabel("Print"), Label.AbsLabel("Printend")));
    }

    public void insert(String key, FunctionEntry entry) {
	htable.insert(key,entry);
    }

    public void beginScope() {
	htable.beginScope();
    }
    
    public void endScope() {
	htable.endScope();
    }

    private HashTable htable;

}