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);
}
private String z3_printSMT2Declarations() {
StringBuilder sb = new StringBuilder();
sb.append("(set-logic AUFLIA)\n\n");
for (String s : z3_helperVars) {
sb.append("(declare-fun ");
sb.append(getProverFriendlyName(s));
sb.append(" () Bool");
sb.append(")\n");
}
for (Entry<Variable, ProverExpr> entry : usedVariable.entrySet()) {
sb.append("(declare-fun ");
sb.append(getProverFriendlyName(entry.getKey().getName()));
sb.append(" () ");
sb.append(z3_type2SMT2(entry.getKey().getType()));
sb.append(")\n");
}
for (Entry<BoogieProcedure, ProverFun> entry : usedFunctions.entrySet()) {
// distinguish between prelude functions that have exactly one
// statement and are pure
// and all the rest.
if (proc.isPure()
&& proc.getRootBlock() != null
&& proc.getRootBlock().getStatements().size() == 1) {
// TODO: for some reason this does not happen,
// as princess already inlines those functions and they
// are not added to the list of used functions.
throw new RuntimeException("SMT2 Printer, unexpected prelude function");
} else {
sb.append("(declare-fun ");
sb.append(getProverFriendlyName(entry.getKey().getName()));
sb.append("( "); // now the params
for (Variable param : entry.getKey().getParameterList()) {
sb.append("(");
sb.append(z3_type2SMT2(param.getType()));
sb.append(") ");
}
sb.append(") "); // done with params
// not the regular return value:
if (entry.getKey().getReturnVariable() != null) {
sb.append(z3_type2SMT2(entry.getKey().getReturnVariable().getType()));
sb.append(" ");
}
// TODO: at this point, the SSA should have removed all
// calls to non-pure functions already, so no need to
// worry about exception handling
sb.append(")\n");
}
}
return sb.toString();
}