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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 declarations.
*
* Also contains a reference to the symbol table of
* the parameters and their arity.
*/
class Tdekl implements AST {
Tident ident; // identifier
Tparlist parlist; // liste of parameter
Texp exp; // function body
public Tdekl(Tident i, Tparlist p, Texp e) {
parlist=p;
ident=i;
exp=e;
}
public String toString() {
return(ident+"("+parlist+") = \n "+exp);
}
SymTab params; // symbol table of the parameters
int arity;
public void setSymtab(SymTab st) {
params = new SymTab(st);
parlist.setSymtab(params,false,0);
arity = params.size();
boolean isNew = st.enter(ident.toString(),
new STEfun(ident.toString(),this,arity));
// CoCo (Fun)
if(!isNew) Main.error("funktion "+ident+" defined twice!");
}
public void printSymtabs() {
System.out.print("funktion "+ident.toString()+"\n"+params);
}
public void checkcontext() {
exp.checkcontext(params); // CoCo (DefFun,DefVar,Arity)
}
public void prepInterp(SymTab st) { // set pointers and indices
exp.prepInterp(params);
}
public int interpret(int[] in, int[] par) {
return(exp.interpret(in,par));
}
public int arity() { return(arity); }
}
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