private ProverFun procedure2ProverExpr(BoogieProcedure proc) {
HashMap<Variable, ProverExpr> localbound = new HashMap<Variable, ProverExpr>();
if (!usedFunctions.containsKey(proc)) {
LinkedList<ProverType> args = new LinkedList<ProverType>();
int idx = 0;
for (Variable v : proc.getParameterList()) {
ProverExpr arg = theoremProver.mkBoundVariable(idx++, type2ProverSort(v.getType()));
args.add(arg.getType());
localbound.put(v, arg);
}
ProverFun vcf = null;
ProverType[] arr = args.toArray(new ProverType[args.size()]);
if (proc.isPure()
&& proc.getRootBlock() != null
&& proc.getRootBlock().getStatements().size() == 1) {
// TODO: this is a hack:
// we assume that this case only occurs for prelude functions
// which have only one statement
// this will not work in any other case
Statement stmt = proc.getRootBlock().getStatements().get(0);
ProverExpr b = null;
if (stmt instanceof ExpressionStatement) {
ExpressionStatement es = (ExpressionStatement) stmt;
b = expression2ProverExpr(es.getExpression(), localbound);
} else {
throw new RuntimeException("procedure2ProverExpr failed");
}
vcf = theoremProver.mkDefinedFunction(getProverFriendlyName(proc.getName()), arr, b);
} else {
vcf =
theoremProver.mkUnintFunction(
getProverFriendlyName(proc.getName()),
arr,
type2ProverSort(proc.getReturnVariable().getType()));
// TODO: uninterpreted functions?
}
usedFunctions.put(proc, vcf);
}
return usedFunctions.get(proc);
}
