5 public class RelationInclusion extends Inclusion {
7 Expr leftelementexpr, rightelementexpr;
8 RelationDescriptor relation;
10 // #TBD#: this flag needs to be set by some static analysis
11 boolean typesafe = true;
12 static boolean worklist = true;
14 public RelationInclusion(Expr leftelementexpr, Expr rightelementexpr, RelationDescriptor relation) {
15 this.leftelementexpr = leftelementexpr;
16 this.rightelementexpr = rightelementexpr;
17 this.relation = relation;
20 public Set getTargetDescriptors() {
21 HashSet v = new HashSet();
26 public Set getRequiredDescriptors() {
27 Set v = leftelementexpr.getRequiredDescriptors();
28 v.addAll(rightelementexpr.getRequiredDescriptors());
30 if (!typesafe) { /* if not typesafe then domain and range are needed to make typesafety checks! */
31 v.add(relation.getDomain());
32 v.add(relation.getRange());
38 public void generate(CodeWriter writer) {
39 VarDescriptor ld = VarDescriptor.makeNew("leftele");
40 leftelementexpr.generate(writer, ld);
41 VarDescriptor rd = VarDescriptor.makeNew("rightele");
42 rightelementexpr.generate(writer, rd);
44 /* typesafe checks! */
45 String typesafecheck = (VarDescriptor.makeNew("typesafecheck")).getSafeSymbol();
48 String check = "int " + typesafecheck + " = " ;
50 if (!(relation.getDomain() instanceof ReservedSetDescriptor)) {
51 check += relation.getDomain().getSafeSymbol() + "_hash->contains(" + ld.getSafeSymbol() + ") && ";
54 if (!(relation.getRange() instanceof ReservedSetDescriptor)) {
55 check += relation.getRange().getSafeSymbol() + "_hash->contains(" + rd.getSafeSymbol() + ") && ";
58 check += "1;"; // terminate boolean expression
60 writer.outputline(check);
61 writer.outputline("if (" + typesafecheck + ")");
65 String addeditem = (VarDescriptor.makeNew("addeditem")).getSafeSymbol();
66 writer.outputline("int " + addeditem + ";");
68 if (relation.testUsage(RelationDescriptor.IMAGE)) {
69 writer.outputline(addeditem + " = " + relation.getSafeSymbol() + "_hash->add((int)" + ld.getSafeSymbol() + ", (int)" + rd.getSafeSymbol() + ");");
72 if (relation.testUsage(RelationDescriptor.INVIMAGE)) {
73 writer.outputline(addeditem + " = " + relation.getSafeSymbol() + "_hashinv->add((int)" + rd.getSafeSymbol() + ", (int)" + ld.getSafeSymbol() + ");");
76 if (RelationInclusion.worklist) {
77 writer.outputline("if (" + addeditem + ")");
78 writer.startblock(); {
79 WorkList.generate_dispatch(writer, relation, rd.getSafeSymbol(), ld.getSafeSymbol());
88 //writer.outputline("printf(\"" + relation.getSafeSymbol() + " (add): <%d, %d>\\n\", " + ld.getSafeSymbol() + ", " + rd.getSafeSymbol() + ");");
91 public boolean typecheck(SemanticAnalyzer sa) {
92 TypeDescriptor ld = leftelementexpr.typecheck(sa);
93 TypeDescriptor rd = rightelementexpr.typecheck(sa);
95 if (ld == null || rd == null) {
101 /* #ATTN#: this check makes sure that the types match up,
102 a runtime check needs to made that the set relationships
105 if (ld != relation.getDomain().getType()) {
106 sa.getErrorReporter().report(null, "Type of left element '" + ld.getSymbol() + "' must match domain type '" + relation.getDomain().getType().getSymbol() + "'");
110 if (rd != relation.getRange().getType()) {
111 assert rd.getSymbol() != null;
112 assert relation.getRange().getType() != null : relation.getRange().getSymbol();
113 sa.getErrorReporter().report(null, "Type of right element '" + rd.getSymbol() + "' must match range type '" + relation.getRange().getType().getSymbol() + "'");