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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 2001 Gerwin Klein <lsf@jflex.de> *
* Copyright (C) 2001 Bernhard Rumpe <rumpe@in.tum.de> *
* All rights reserved. *
* *
* License: BSD *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/**
* AST node for function application.
*
* Also contains pointer to declaration location of the function.
*/
class Tfun extends Texp implements AST {
Tident ident; // name of the function
Texplist explist; // parameter list
public Tfun(Tident i, Texplist e) {
ident=i;
explist=e;
}
public String toString() {
return ident+"("+explist+")";
}
public void checkcontext(SymTab st) { // CoCo (DefFun,Arity)
explist.checkcontext(st);
SymtabEntry ste = st.lookup(ident.toString());
if (ste==null)
Main.error("function not defined: "+ident);
else if (ste.kind() != SymtabEntry.FUN)
Main.error("variable used as funktion: "+ident);
else if (((STEfun)ste).arity() != explist.length())
Main.error("wrong arity at function call: "+ident);
}
Tdekl fundekl; // pointer to location of function declaration
// set pointers and indices
public void prepInterp(SymTab st) {
fundekl = ((STEfun)st.lookup(ident.toString())).getDekl();
explist.prepInterp(st);
}
public int interpret(int[] in, int[] par) {
int[] newparams = new int[fundekl.arity()];
explist.interpret(in,par,newparams,0);
return fundekl.interpret(in,newparams);
}
}
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