6 public class SemanticCheck {
10 public SemanticCheck(State state, TypeUtil tu) {
15 public void semanticCheck() {
16 SymbolTable classtable=state.getClassSymbolTable();
17 Iterator it=classtable.getDescriptorsIterator();
19 ClassDescriptor cd=(ClassDescriptor)it.next();
20 System.out.println("Checking class: "+cd);
21 for(Iterator field_it=cd.getFields();field_it.hasNext();) {
22 FieldDescriptor fd=(FieldDescriptor)field_it.next();
23 System.out.println("Checking field: "+fd);
27 for(Iterator method_it=cd.getMethods();method_it.hasNext();) {
28 MethodDescriptor md=(MethodDescriptor)method_it.next();
34 public void checkTypeDescriptor(TypeDescriptor td) {
38 String name=td.toString();
39 ClassDescriptor field_cd=(ClassDescriptor)state.getClassSymbolTable().get(name);
41 throw new Error("Undefined class "+name);
42 td.setClassDescriptor(field_cd);
48 public void checkField(ClassDescriptor cd, FieldDescriptor fd) {
49 checkTypeDescriptor(fd.getType());
52 public void checkMethod(ClassDescriptor cd, MethodDescriptor md) {
53 /* Check return type */
54 if (!md.getReturnType().isVoid())
55 checkTypeDescriptor(md.getReturnType());
56 for(int i=0;i<md.numParameters();i++) {
57 TypeDescriptor param_type=md.getParamType(i);
58 checkTypeDescriptor(param_type);
60 BlockNode bn=state.getMethodBody(md);
61 /* Link the naming environments */
62 md.getParameterTable().setParent(cd.getFieldTable());
63 checkBlockNode(md, md.getParameterTable(),bn);
66 public void checkBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn) {
67 /* Link in the naming environment */
68 bn.getVarTable().setParent(nametable);
69 for(int i=0;i<bn.size();i++) {
70 BlockStatementNode bsn=bn.get(i);
71 checkBlockStatementNode(md, bn.getVarTable(),bsn);
75 public void checkBlockStatementNode(MethodDescriptor md, SymbolTable nametable, BlockStatementNode bsn) {
77 case Kind.BlockExpressionNode:
78 checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
81 case Kind.DeclarationNode:
82 checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
85 case Kind.IfStatementNode:
86 checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
90 checkLoopNode(md, nametable, (LoopNode)bsn);
94 checkReturnNode(md, nametable, (ReturnNode)bsn);
97 case Kind.SubBlockNode:
98 checkSubBlockNode(md, nametable, (SubBlockNode)bsn);
104 void checkBlockExpressionNode(MethodDescriptor md, SymbolTable nametable, BlockExpressionNode ben) {
105 checkExpressionNode(md, nametable, ben.getExpression(), null);
108 void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
109 VarDescriptor vd=dn.getVarDescriptor();
110 checkTypeDescriptor(vd.getType());
111 Descriptor d=nametable.get(vd.getSymbol());
113 (d instanceof FieldDescriptor)) {
116 throw new Error(vd.getSymbol()+" defined a second time");
117 if (dn.getExpression()!=null)
118 checkExpressionNode(md, nametable, dn.getExpression(), vd.getType());
121 void checkSubBlockNode(MethodDescriptor md, SymbolTable nametable, SubBlockNode sbn) {
122 checkBlockNode(md, nametable, sbn.getBlockNode());
125 void checkReturnNode(MethodDescriptor md, SymbolTable nametable, ReturnNode rn) {
126 checkExpressionNode(md, nametable, rn.getReturnExpression(), md.getReturnType());
129 void checkIfStatementNode(MethodDescriptor md, SymbolTable nametable, IfStatementNode isn) {
130 checkExpressionNode(md, nametable, isn.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
131 checkBlockNode(md, nametable, isn.getTrueBlock());
132 checkBlockNode(md, nametable, isn.getFalseBlock());
135 void checkExpressionNode(MethodDescriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
137 case Kind.AssignmentNode:
138 checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
141 checkCastNode(md,nametable,(CastNode)en,td);
143 case Kind.CreateObjectNode:
144 checkCreateObjectNode(md,nametable,(CreateObjectNode)en,td);
146 case Kind.FieldAccessNode:
147 checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
149 case Kind.LiteralNode:
150 checkLiteralNode(md,nametable,(LiteralNode)en,td);
152 case Kind.MethodInvokeNode:
153 checkMethodInvokeNode(md,nametable,(MethodInvokeNode)en,td);
156 checkNameNode(md,nametable,(NameNode)en,td);
159 checkOpNode(md,nametable,(OpNode)en,td);
165 void checkAssignmentNode(MethodDescriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
169 void checkCastNode(MethodDescriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
172 void checkCreateObjectNode(MethodDescriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
175 void checkFieldAccessNode(MethodDescriptor md, SymbolTable nametable, FieldAccessNode fan, TypeDescriptor td) {
178 void checkLiteralNode(MethodDescriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
182 void checkMethodInvokeNode(MethodDescriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
185 void checkNameNode(MethodDescriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
188 void checkOpNode(MethodDescriptor md, SymbolTable nametable, OpNode on,TypeDescriptor td) {
191 void checkLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {