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() {
32 public Expr getSizeExpr() {
33 return getOffsetExpr(null);
37 Hashtable oexpr=new Hashtable();
39 public Expr getOffsetExpr(FieldDescriptor field) {
42 sizeexpr=internalgetOffsetExpr(field);
45 } else if (oexpr.containsKey(field)) {
46 return (Expr)oexpr.get(field);
48 Expr tmp=internalgetOffsetExpr(field);
55 private Expr internalgetOffsetExpr(FieldDescriptor field) {
56 /* Fix sizeof calculations */
57 if ((field==null)&&(subtype!=null))
58 return subtype.getSizeExpr();
61 Expr size = new IntegerLiteralExpr(0);
63 for (int i = 0; i < fieldlist.size(); i++) {
64 FieldDescriptor fd = (FieldDescriptor)fieldlist.elementAt(i);
66 TypeDescriptor td = fd.getType();
67 boolean ptr = fd.getPtr();
69 if (ptr) { /* ptrs are 32bits */
70 basesize = new IntegerLiteralExpr(32);
72 basesize = td.getSizeExpr();
75 if (fd instanceof ArrayDescriptor) {
76 Expr totalsize = new OpExpr(Opcode.MULT, basesize, ((ArrayDescriptor) fd).getIndexBound());
81 if (td instanceof ReservedTypeDescriptor) {
82 ReservedTypeDescriptor rtd=(ReservedTypeDescriptor) td;
83 if (rtd==ReservedTypeDescriptor.BIT) {
87 size=new OpExpr(Opcode.RND, size,null);
93 size=new OpExpr(Opcode.RND, size,null);
98 if (fd == field) { /* stop, reached target field */
102 size = new OpExpr(Opcode.ADD, fieldsize, size);
105 if ((field==null)&&(!aligned))
106 return new OpExpr(Opcode.RND, size, null);
110 public Iterator getFields() {
111 return fields.values().iterator();
114 public Iterator getLabels() {
115 return labels.values().iterator();
118 public FieldDescriptor getField(String name) {
119 return (FieldDescriptor) fields.get(name);
122 public LabelDescriptor getLabel(String name) {
123 return (LabelDescriptor) labels.get(name);
126 public void addField(FieldDescriptor fd) {
127 if (getField(fd.getSymbol()) != null) {
128 throw new IRException("Can not overwrite a field once it has been added.");
130 fields.put(fd.getSymbol(), fd);
131 fieldlist.addElement(fd);
134 public void addLabel(LabelDescriptor ld) {
135 if (getLabel(ld.getSymbol()) != null) {
136 throw new IRException("Can not overwrite a label once it has been added.");
138 labels.put(ld.getSymbol(), ld);
141 public TypeDescriptor getSuperType() {
145 public void setSuperType(TypeDescriptor td) {
149 public boolean isSubtypeOf(TypeDescriptor td) {
155 return subtype.isSubtypeOf(td);
159 public void generate_printout(CodeWriter cr, VarDescriptor vd) {
160 // #TBD#: does not support printing out fields that have variable size, substructures, etc
162 cr.outputline("printf(\"" + getSymbol() + " %p: \", " + vd.getSafeSymbol() + ");");
163 for (int i = 0; i < fieldlist.size(); i++) {
164 FieldDescriptor fd = (FieldDescriptor) fieldlist.elementAt(i);
165 cr.outputline("printf(\"\\n\\t" + fd.getSymbol() + " = \");");
167 cr.outputline("printf(\"(" + fd.getType().getSymbol() + ") %p \", ((int *)" + vd.getSafeSymbol() + ")[" + i + "]);");
168 } else if ( fd.getType() instanceof ReservedTypeDescriptor) {
169 cr.outputline("printf(\"%d \", ((int *)" + vd.getSafeSymbol() + ")[" + i + "]);");
171 cr.outputline("printf(\"unsupported, breaking\");");
176 cr.outputline("printf(\"\\n\");");