+++ /dev/null
-package IR.Tree;
-
-import java.util.*;
-import IR.*;
-
-public class SemanticCheck {
- State state;
- TypeUtil typeutil;
-
- public SemanticCheck(State state, TypeUtil tu) {
- this.state=state;
- this.typeutil=tu;
- }
-
- public void semanticCheck() {
- SymbolTable classtable=state.getClassSymbolTable();
- Iterator it=classtable.getDescriptorsIterator();
- // Do descriptors first
- while(it.hasNext()) {
- ClassDescriptor cd=(ClassDescriptor)it.next();
- System.out.println("Checking class: "+cd);
- //Set superclass link up
- if (cd.getSuper()!=null) {
- cd.setSuper(typeutil.getClass(cd.getSuper()));
- // Link together Field and Method tables
- cd.getFieldTable().setParent(cd.getSuperDesc().getFieldTable());
- cd.getMethodTable().setParent(cd.getSuperDesc().getMethodTable());
- }
-
- 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);
- }
- }
-
- it=classtable.getDescriptorsIterator();
- // Do descriptors first
- while(it.hasNext()) {
- ClassDescriptor cd=(ClassDescriptor)it.next();
- for(Iterator method_it=cd.getMethods();method_it.hasNext();) {
- MethodDescriptor md=(MethodDescriptor)method_it.next();
- checkMethodBody(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);
- }
- /* Link the naming environments */
- md.getParameterTable().setParent(cd.getFieldTable());
- }
-
- public void checkMethodBody(ClassDescriptor cd, MethodDescriptor md) {
- BlockNode bn=state.getMethodBody(md);
- 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");
- if (dn.getExpression()!=null)
- 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 checkCastNode(MethodDescriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
- /* Get type descriptor */
- if (cn.getType()==null) {
- NameDescriptor typenamed=cn.getTypeName().getName();
- String typename=typenamed.toString();
- TypeDescriptor ntd=new TypeDescriptor(typeutil.getClass(typename));
- cn.setType(ntd);
- }
-
- /* Check the type descriptor */
- TypeDescriptor cast_type=cn.getType();
- checkTypeDescriptor(cast_type);
-
- /* Type check */
- if (td!=null) {
- if (!typeutil.isSuperorType(td,cast_type))
- throw new Error("Cast node returns "+cast_type+", but need "+td);
- }
-
- ExpressionNode en=cn.getExpression();
- checkExpressionNode(md, nametable, en, null);
- TypeDescriptor etd=en.getType();
- if (typeutil.isSuperorType(cast_type,etd)) /* Cast trivially succeeds */
- return;
-
- if (typeutil.isSuperorType(etd,cast_type)) /* Cast may succeed */
- return;
-
- /* Different branches */
- /* TODO: change if add interfaces */
- throw new Error("Cast will always fail\n"+cn.printNode(0));
- }
-
- void checkFieldAccessNode(MethodDescriptor md, SymbolTable nametable, FieldAccessNode fan, TypeDescriptor td) {
- ExpressionNode left=fan.getExpression();
- checkExpressionNode(md,nametable,left,null);
- TypeDescriptor ltd=left.getType();
- String fieldname=fan.getFieldName();
- FieldDescriptor fd=(FieldDescriptor) ltd.getClassDesc().getFieldTable().get(fieldname);
- if (fd==null)
- throw new Error("Unknown field "+fieldname);
- fan.setField(fd);
- if (td!=null)
- if (!typeutil.isSuperorType(td,fan.getType()))
- throw new Error("Field node returns "+fan.getType()+", but need "+td);
- }
-
- void checkLiteralNode(MethodDescriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
- /* Resolve the type */
- Object o=ln.getValue();
- if (ln.getTypeString().equals("null")) {
- ln.setType(new TypeDescriptor(TypeDescriptor.NULL));
- } else if (o instanceof Integer) {
- ln.setType(new TypeDescriptor(TypeDescriptor.INT));
- } else if (o instanceof Long) {
- ln.setType(new TypeDescriptor(TypeDescriptor.LONG));
- } else if (o instanceof Float) {
- ln.setType(new TypeDescriptor(TypeDescriptor.FLOAT));
- } else if (o instanceof Double) {
- ln.setType(new TypeDescriptor(TypeDescriptor.DOUBLE));
- } else if (o instanceof Character) {
- ln.setType(new TypeDescriptor(TypeDescriptor.CHAR));
- } else if (o instanceof String) {
- ln.setType(new TypeDescriptor(typeutil.getClass(TypeUtil.StringClass)));
- }
-
- if (td!=null)
- if (!typeutil.isSuperorType(td,ln.getType()))
- throw new Error("Field node returns "+ln.getType()+", but need "+td);
- }
-
- void checkNameNode(MethodDescriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
- NameDescriptor nd=nn.getName();
- String varname=nd.toString();
- VarDescriptor vd=(VarDescriptor)nametable.get(varname);
- if (vd==null) {
- throw new Error("Variable "+varname+" undefined");
- }
- nn.setVar(vd);
- if (td!=null)
- if (!typeutil.isSuperorType(td,nn.getType()))
- throw new Error("Field node returns "+nn.getType()+", but need "+td);
- }
-
- void checkAssignmentNode(MethodDescriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
- checkExpressionNode(md, nametable, an.getSrc() ,td);
- //TODO: Need check on validity of operation here
- if (!((an.getDest() instanceof FieldAccessNode)||
- (an.getDest() instanceof NameNode)))
- throw new Error("Bad lside in "+an.printNode(0));
- checkExpressionNode(md, nametable, an.getDest(), null);
- if (!typeutil.isSuperorType(an.getDest().getType(),an.getSrc().getType()))
- throw new Error("Type of rside not compatible with type of lside"+an.printNode(0));
- }
-
- void checkLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {
- if (ln.getType()==LoopNode.WHILELOOP||ln.getType()==LoopNode.DOWHILELOOP) {
- checkExpressionNode(md, nametable, ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
- checkBlockNode(md, nametable, ln.getBody());
- } else {
- //For loop case
- /* Link in the initializer naming environment */
- BlockNode bn=ln.getInitializer();
- bn.getVarTable().setParent(nametable);
- for(int i=0;i<bn.size();i++) {
- BlockStatementNode bsn=bn.get(i);
- checkBlockStatementNode(md, bn.getVarTable(),bsn);
- }
- //check the condition
- checkExpressionNode(md, bn.getVarTable(), ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
- checkBlockNode(md, bn.getVarTable(), ln.getBody());
- checkBlockNode(md, bn.getVarTable(), ln.getUpdate());
- }
- }
-
-
- void checkCreateObjectNode(MethodDescriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
-
- }
-
-
- void checkMethodInvokeNode(MethodDescriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
-
- }
-
-
- void checkOpNode(MethodDescriptor md, SymbolTable nametable, OpNode on,TypeDescriptor td) {
- }
-
-
-}