+package IR.Tree;
+
+import java.util.*;
+import IR.*;
+
+public class SemanticCheck {
+ State state;
+
+ public SemanticCheck(State state) {
+ this.state=state;
+ }
+
+ public void semanticCheck() {
+ SymbolTable classtable=state.getClassSymbolTable();
+ Iterator it=classtable.getDescriptorsIterator();
+ while(it.hasNext()) {
+ ClassDescriptor cd=(ClassDescriptor)it.next();
+ System.out.println("Checking class: "+cd);
+ for(Iterator field_it=cd.getFields();field_it.hasNext();) {
+ FieldDescriptor fd=(FieldDescriptor)field_it.next();
+ System.out.println("Checking field: "+fd);
+ checkField(cd,fd);
+ }
+
+ for(Iterator method_it=cd.getMethods();method_it.hasNext();) {
+ MethodDescriptor md=(MethodDescriptor)method_it.next();
+ checkMethod(cd,md);
+ }
+ }
+ }
+
+ public void checkTypeDescriptor(TypeDescriptor td) {
+ if (td.isPrimitive())
+ return; /* Done */
+ if (td.isClass()) {
+ String name=td.toString();
+ ClassDescriptor field_cd=(ClassDescriptor)state.getClassSymbolTable().get(name);
+ if (field_cd==null)
+ throw new Error("Undefined class "+name);
+ td.setClassDescriptor(field_cd);
+ return;
+ }
+ throw new Error();
+ }
+
+ public void checkField(ClassDescriptor cd, FieldDescriptor fd) {
+ checkTypeDescriptor(fd.getType());
+ }
+
+ public void checkMethod(ClassDescriptor cd, MethodDescriptor md) {
+ /* Check return type */
+ if (!md.getReturnType().isVoid())
+ checkTypeDescriptor(md.getReturnType());
+ for(int i=0;i<md.numParameters();i++) {
+ TypeDescriptor param_type=md.getParamType(i);
+ checkTypeDescriptor(param_type);
+ }
+ BlockNode bn=state.getMethodBody(md);
+ /* Link the naming environments */
+ md.getParameterTable().setParent(cd.getFieldTable());
+ checkBlockNode(md, md.getParameterTable(),bn);
+ }
+
+ public void checkBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn) {
+ /* Link in the naming environment */
+ bn.getVarTable().setParent(nametable);
+ for(int i=0;i<bn.size();i++) {
+ BlockStatementNode bsn=bn.get(i);
+ checkBlockStatementNode(md, bn.getVarTable(),bsn);
+ }
+ }
+
+ public void checkBlockStatementNode(MethodDescriptor md, SymbolTable nametable, BlockStatementNode bsn) {
+ switch(bsn.kind()) {
+ case Kind.BlockExpressionNode:
+ checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
+ return;
+
+ case Kind.DeclarationNode:
+ checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
+ return;
+
+ case Kind.IfStatementNode:
+ checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
+ return;
+
+ case Kind.LoopNode:
+ checkLoopNode(md, nametable, (LoopNode)bsn);
+ return;
+
+ case Kind.ReturnNode:
+ checkReturnNode(md, nametable, (ReturnNode)bsn);
+ return;
+
+ case Kind.SubBlockNode:
+ checkSubBlockNode(md, nametable, (SubBlockNode)bsn);
+ return;
+ }
+ throw new Error();
+ }
+
+ void checkBlockExpressionNode(MethodDescriptor md, SymbolTable nametable, BlockExpressionNode ben) {
+ checkExpressionNode(md, nametable, ben.getExpression(), null);
+ }
+
+ void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
+ VarDescriptor vd=dn.getVarDescriptor();
+ checkTypeDescriptor(vd.getType());
+ Descriptor d=nametable.get(vd.getSymbol());
+ if ((d==null)||
+ (d instanceof FieldDescriptor)) {
+ nametable.add(vd);
+ } else
+ throw new Error(vd.getSymbol()+" defined a second time");
+ checkExpressionNode(md, nametable, dn.getExpression(), vd.getType());
+ }
+
+ void checkSubBlockNode(MethodDescriptor md, SymbolTable nametable, SubBlockNode sbn) {
+ checkBlockNode(md, nametable, sbn.getBlockNode());
+ }
+
+ void checkReturnNode(MethodDescriptor md, SymbolTable nametable, ReturnNode rn) {
+ checkExpressionNode(md, nametable, rn.getReturnExpression(), md.getReturnType());
+ }
+
+ void checkIfStatementNode(MethodDescriptor md, SymbolTable nametable, IfStatementNode isn) {
+ checkExpressionNode(md, nametable, isn.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
+ checkBlockNode(md, nametable, isn.getTrueBlock());
+ checkBlockNode(md, nametable, isn.getFalseBlock());
+ }
+
+ void checkExpressionNode(MethodDescriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
+ switch(en.kind()) {
+ case Kind.AssignmentNode:
+ checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
+ return;
+ case Kind.CastNode:
+ checkCastNode(md,nametable,(CastNode)en,td);
+ return;
+ case Kind.CreateObjectNode:
+ checkCreateObjectNode(md,nametable,(CreateObjectNode)en,td);
+ return;
+ case Kind.FieldAccessNode:
+ checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
+ return;
+ case Kind.LiteralNode:
+ checkLiteralNode(md,nametable,(LiteralNode)en,td);
+ return;
+ case Kind.MethodInvokeNode:
+ checkMethodInvokeNode(md,nametable,(MethodInvokeNode)en,td);
+ return;
+ case Kind.NameNode:
+ checkNameNode(md,nametable,(NameNode)en,td);
+ return;
+ case Kind.OpNode:
+ checkOpNode(md,nametable,(OpNode)en,td);
+ return;
+ }
+ throw new Error();
+ }
+
+ void checkAssignmentNode(MethodDescriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
+
+ }
+
+ void checkCastNode(MethodDescriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
+ }
+
+ void checkCreateObjectNode(MethodDescriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
+ }
+
+ void checkFieldAccessNode(MethodDescriptor md, SymbolTable nametable, FieldAccessNode fan, TypeDescriptor td) {
+ }
+
+ void checkLiteralNode(MethodDescriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
+ }
+
+ void checkMethodInvokeNode(MethodDescriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
+ }
+
+ void checkNameNode(MethodDescriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
+ }
+
+ void checkOpNode(MethodDescriptor md, SymbolTable nametable, OpNode on,TypeDescriptor td) {
+ }
+
+ void checkLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {
+ }
+}
projects / IRC.git / commitdiff