4 * StructureTypeDescriptor
6 * represents structure types
11 public class StructureTypeDescriptor extends TypeDescriptor {
13 TypeDescriptor subtype;
15 Hashtable fields = new Hashtable(); /* fast lookups */
16 Vector fieldlist = new Vector(); /* ordering information */
17 Hashtable labels = new Hashtable();
20 public StructureTypeDescriptor(String name) {
24 public TypeDescriptor getGenerateType() {
25 return ReservedTypeDescriptor.INT;
28 public Enumeration getFieldKeys() {
33 public Expr getSizeExpr() {
34 return getOffsetExpr(null);
37 public Expr getOffsetExpr(FieldDescriptor field) {
38 /* Fix sizeof calculations */
39 if ((field==null)&&(subtype!=null))
40 return subtype.getSizeExpr();
43 Expr size = new IntegerLiteralExpr(0);
45 for (int i = 0; i < fieldlist.size(); i++) {
46 FieldDescriptor fd = (FieldDescriptor)fieldlist.elementAt(i);
48 TypeDescriptor td = fd.getType();
49 boolean ptr = fd.getPtr();
51 if (ptr) { /* ptrs are 32bits */
53 basesize = new IntegerLiteralExpr(32);
55 basesize = td.getSizeExpr();
58 if (fd instanceof ArrayDescriptor) {
59 Expr totalsize = new OpExpr(Opcode.MULT, basesize, ((ArrayDescriptor) fd).getIndexBound());
64 if (td instanceof ReservedTypeDescriptor) {
65 ReservedTypeDescriptor rtd=(ReservedTypeDescriptor) td;
66 if (rtd==ReservedTypeDescriptor.BIT) {
70 size=new OpExpr(Opcode.RND, size,null);
76 size=new OpExpr(Opcode.RND, size,null);
81 if (fd == field) { /* stop, reached target field */
85 size = new OpExpr(Opcode.ADD, fieldsize, size);
88 if ((field==null)&&(!aligned))
89 return new OpExpr(Opcode.RND, size, null);
93 public Iterator getFields() {
94 return fields.values().iterator();
97 public Iterator getLabels() {
98 return labels.values().iterator();
101 public FieldDescriptor getField(String name) {
102 return (FieldDescriptor) fields.get(name);
105 public LabelDescriptor getLabel(String name) {
106 return (LabelDescriptor) labels.get(name);
109 public void addField(FieldDescriptor fd) {
110 if (getField(fd.getSymbol()) != null) {
111 throw new IRException("Can not overwrite a field once it has been added.");
113 fields.put(fd.getSymbol(), fd);
114 fieldlist.addElement(fd);
117 public void addLabel(LabelDescriptor ld) {
118 if (getLabel(ld.getSymbol()) != null) {
119 throw new IRException("Can not overwrite a label once it has been added.");
121 labels.put(ld.getSymbol(), ld);
124 public TypeDescriptor getSuperType() {
128 public void setSuperType(TypeDescriptor td) {
132 public boolean isSubtypeOf(TypeDescriptor td) {
138 return subtype.isSubtypeOf(td);