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 = false;
14 public RelationInclusion(Expr leftelementexpr, Expr rightelementexpr, RelationDescriptor relation) {
15 this.leftelementexpr = leftelementexpr;
16 this.rightelementexpr = rightelementexpr;
17 this.relation = relation;
20 public Expr getLeftExpr() {
21 return leftelementexpr;
24 public Expr getRightExpr() {
25 return rightelementexpr;
28 public RelationDescriptor getRelation() {
32 public Set getTargetDescriptors() {
33 HashSet v = new HashSet();
38 public Set getRequiredDescriptors() {
39 Set v = leftelementexpr.getRequiredDescriptors();
40 v.addAll(rightelementexpr.getRequiredDescriptors());
42 if (!typesafe) { /* if not typesafe then domain and range are needed to make typesafety checks! */
43 v.add(relation.getDomain());
44 v.add(relation.getRange());
50 public void generate(CodeWriter writer) {
51 VarDescriptor ld = VarDescriptor.makeNew("leftele");
52 leftelementexpr.generate(writer, ld);
53 VarDescriptor rd = VarDescriptor.makeNew("rightele");
54 rightelementexpr.generate(writer, rd);
56 /* typesafe checks! */
57 String typesafecheck = (VarDescriptor.makeNew("typesafecheck")).getSafeSymbol();
60 String check = "int " + typesafecheck + " = " ;
62 if (!(relation.getDomain() instanceof ReservedSetDescriptor)) {
63 check += relation.getDomain().getSafeSymbol() + "_hash->contains(" + ld.getSafeSymbol() + ") && ";
66 if (!(relation.getRange() instanceof ReservedSetDescriptor)) {
67 check += relation.getRange().getSafeSymbol() + "_hash->contains(" + rd.getSafeSymbol() + ") && ";
70 check += "1;"; // terminate boolean expression
72 writer.outputline(check);
73 writer.outputline("if (" + typesafecheck + ")");
77 String addeditem = (VarDescriptor.makeNew("addeditem")).getSafeSymbol();
78 writer.outputline("int " + addeditem + ";");
80 if (relation.testUsage(RelationDescriptor.IMAGE)) {
81 writer.outputline(addeditem + " = " + relation.getSafeSymbol() + "_hash->add((int)" + ld.getSafeSymbol() + ", (int)" + rd.getSafeSymbol() + ");");
84 if (relation.testUsage(RelationDescriptor.INVIMAGE)) {
85 writer.outputline(addeditem + " = " + relation.getSafeSymbol() + "_hashinv->add((int)" + rd.getSafeSymbol() + ", (int)" + ld.getSafeSymbol() + ");");
88 if (RelationInclusion.worklist) {
89 writer.outputline("if (" + addeditem + ")");
90 writer.startblock(); {
91 WorkList.generate_dispatch(writer, relation, rd.getSafeSymbol(), ld.getSafeSymbol());
100 //writer.outputline("printf(\"" + relation.getSafeSymbol() + " (add): <%d, %d>\\n\", " + ld.getSafeSymbol() + ", " + rd.getSafeSymbol() + ");");
103 public boolean typecheck(SemanticAnalyzer sa) {
104 TypeDescriptor ld = leftelementexpr.typecheck(sa);
105 TypeDescriptor rd = rightelementexpr.typecheck(sa);
107 if (ld == null || rd == null) {
113 /* #ATTN#: this check makes sure that the types match up,
114 a runtime check needs to made that the set relationships
117 if (ld != relation.getDomain().getType()) {
118 sa.getErrorReporter().report(null, "Type of left element '" + ld.getSymbol() + "' must match domain type '" + relation.getDomain().getType().getSymbol() + "'");
122 if (rd != relation.getRange().getType()) {
123 assert rd.getSymbol() != null;
124 assert relation.getRange().getType() != null : relation.getRange().getSymbol();
125 sa.getErrorReporter().report(null, "Type of right element '" + rd.getSymbol() + "' must match range type '" + relation.getRange().getType().getSymbol() + "'");