7 public class SemanticCheck {
15 public SemanticCheck(State state, TypeUtil tu) {
18 this.loopstack=new Stack();
19 this.toanalyze=new HashSet();
20 this.completed=new HashSet();
23 public ClassDescriptor getClass(String classname) {
24 ClassDescriptor cd=typeutil.getClass(classname, toanalyze);
29 private void checkClass(ClassDescriptor cd) {
30 if (!completed.contains(cd)) {
33 //Set superclass link up
34 if (cd.getSuper()!=null) {
35 cd.setSuper(getClass(cd.getSuper()));
36 // Link together Field, Method, and Flag tables so classes
37 // inherit these from their superclasses
38 cd.getFieldTable().setParent(cd.getSuperDesc().getFieldTable());
39 cd.getMethodTable().setParent(cd.getSuperDesc().getMethodTable());
40 cd.getFlagTable().setParent(cd.getSuperDesc().getFlagTable());
42 // TODO add version for normal Java later
43 // Link together Field, Method tables do classes inherit these from
44 // their ancestor interfaces
45 Vector<String> sifv = cd.getSuperInterface();
46 for(int i = 0; i < sifv.size(); i++) {
47 ClassDescriptor superif = getClass(sifv.elementAt(i));
48 cd.addSuperInterfaces(superif);
49 cd.getFieldTable().addParentIF(superif.getFieldTable());
50 cd.getMethodTable().addParentIF(superif.getMethodTable());
55 /* Check to see that fields are well typed */
56 for(Iterator field_it=cd.getFields(); field_it.hasNext();) {
57 FieldDescriptor fd=(FieldDescriptor)field_it.next();
61 boolean hasConstructor = false;
62 for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
63 MethodDescriptor md=(MethodDescriptor)method_it.next();
65 hasConstructor |= md.isConstructor();
68 // add a default constructor for this class
69 MethodDescriptor md = new MethodDescriptor(new Modifiers(Modifiers.PUBLIC),
70 cd.getSymbol(), false);
71 BlockNode bn=new BlockNode();
72 state.addTreeCode(md,bn);
79 public void semanticCheck() {
80 SymbolTable classtable=state.getClassSymbolTable();
81 toanalyze.addAll(classtable.getValueSet());
82 toanalyze.addAll(state.getTaskSymbolTable().getValueSet());
85 while(!toanalyze.isEmpty()) {
86 Object obj=toanalyze.iterator().next();
87 if (obj instanceof TaskDescriptor) {
88 toanalyze.remove(obj);
89 TaskDescriptor td=(TaskDescriptor)obj;
93 System.out.println( "Error in "+td );
97 ClassDescriptor cd=(ClassDescriptor)obj;
99 //need to initialize typeutil object here...only place we can
100 //get class descriptors without first calling getclass
101 getClass(cd.getSymbol());
102 for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
103 MethodDescriptor md=(MethodDescriptor)method_it.next();
105 checkMethodBody(cd,md);
107 System.out.println( "Error in "+md );
115 public void checkTypeDescriptor(TypeDescriptor td) {
116 if (td.isPrimitive())
118 else if (td.isClass()) {
119 String name=td.toString();
120 ClassDescriptor field_cd=getClass(name);
122 throw new Error("Undefined class "+name);
123 td.setClassDescriptor(field_cd);
125 } else if (td.isTag())
131 public void checkField(ClassDescriptor cd, FieldDescriptor fd) {
132 checkTypeDescriptor(fd.getType());
135 public void checkConstraintCheck(TaskDescriptor td, SymbolTable nametable, Vector ccs) {
137 return; /* No constraint checks to check */
138 for(int i=0; i<ccs.size(); i++) {
139 ConstraintCheck cc=(ConstraintCheck) ccs.get(i);
141 for(int j=0; j<cc.numArgs(); j++) {
142 ExpressionNode en=cc.getArg(j);
143 checkExpressionNode(td,nametable,en,null);
148 public void checkFlagEffects(TaskDescriptor td, Vector vfe, SymbolTable nametable) {
150 return; /* No flag effects to check */
151 for(int i=0; i<vfe.size(); i++) {
152 FlagEffects fe=(FlagEffects) vfe.get(i);
153 String varname=fe.getName();
154 //Make sure the variable is declared as a parameter to the task
155 VarDescriptor vd=(VarDescriptor)td.getParameterTable().get(varname);
157 throw new Error("Parameter "+varname+" in Flag Effects not declared in "+td);
160 //Make sure it correspods to a class
161 TypeDescriptor type_d=vd.getType();
162 if (!type_d.isClass())
163 throw new Error("Cannot have non-object argument for flag_effect");
165 ClassDescriptor cd=type_d.getClassDesc();
166 for(int j=0; j<fe.numEffects(); j++) {
167 FlagEffect flag=fe.getEffect(j);
168 String name=flag.getName();
169 FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
170 //Make sure the flag is declared
172 throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
173 if (flag_d.getExternal())
174 throw new Error("Attempting to modify external flag: "+name);
175 flag.setFlag(flag_d);
177 for(int j=0; j<fe.numTagEffects(); j++) {
178 TagEffect tag=fe.getTagEffect(j);
179 String name=tag.getName();
181 Descriptor d=(Descriptor)nametable.get(name);
183 throw new Error("Tag descriptor "+name+" undeclared");
184 else if (!(d instanceof TagVarDescriptor))
185 throw new Error(name+" is not a tag descriptor");
186 tag.setTag((TagVarDescriptor)d);
191 public void checkTask(TaskDescriptor td) {
192 for(int i=0; i<td.numParameters(); i++) {
193 /* Check that parameter is well typed */
194 TypeDescriptor param_type=td.getParamType(i);
195 checkTypeDescriptor(param_type);
197 /* Check the parameter's flag expression is well formed */
198 FlagExpressionNode fen=td.getFlag(td.getParameter(i));
199 if (!param_type.isClass())
200 throw new Error("Cannot have non-object argument to a task");
201 ClassDescriptor cd=param_type.getClassDesc();
203 checkFlagExpressionNode(cd, fen);
206 checkFlagEffects(td, td.getFlagEffects(),td.getParameterTable());
207 /* Check that the task code is valid */
208 BlockNode bn=state.getMethodBody(td);
209 checkBlockNode(td, td.getParameterTable(),bn);
212 public void checkFlagExpressionNode(ClassDescriptor cd, FlagExpressionNode fen) {
214 case Kind.FlagOpNode:
216 FlagOpNode fon=(FlagOpNode)fen;
217 checkFlagExpressionNode(cd, fon.getLeft());
218 if (fon.getRight()!=null)
219 checkFlagExpressionNode(cd, fon.getRight());
225 FlagNode fn=(FlagNode)fen;
226 String name=fn.getFlagName();
227 FlagDescriptor fd=(FlagDescriptor)cd.getFlagTable().get(name);
229 throw new Error("Undeclared flag: "+name);
235 throw new Error("Unrecognized FlagExpressionNode");
239 public void checkMethod(ClassDescriptor cd, MethodDescriptor md) {
241 // TODO add version for normal Java later
242 /* Check for abstract methods */
243 if(md.isAbstract()) {
244 if(!cd.isAbstract() && !cd.isInterface()) {
245 throw new Error("Error! The non-abstract Class " + cd.getSymbol() + " contains an abstract method " + md.getSymbol());
249 /* Check return type */
250 if (!md.isConstructor())
251 if (!md.getReturnType().isVoid())
252 checkTypeDescriptor(md.getReturnType());
254 for(int i=0; i<md.numParameters(); i++) {
255 TypeDescriptor param_type=md.getParamType(i);
256 checkTypeDescriptor(param_type);
258 /* Link the naming environments */
259 if (!md.isStatic()) /* Fields aren't accessible directly in a static method, so don't link in this table */
260 md.getParameterTable().setParent(cd.getFieldTable());
262 if (!md.isStatic()) {
263 VarDescriptor thisvd=new VarDescriptor(new TypeDescriptor(cd),"this");
268 public void checkMethodBody(ClassDescriptor cd, MethodDescriptor md) {
269 ClassDescriptor superdesc=cd.getSuperDesc();
270 if (superdesc!=null) {
271 Set possiblematches=superdesc.getMethodTable().getSet(md.getSymbol());
272 for(Iterator methodit=possiblematches.iterator(); methodit.hasNext();) {
273 MethodDescriptor matchmd=(MethodDescriptor)methodit.next();
274 if (md.matches(matchmd)) {
275 if (matchmd.getModifiers().isFinal()) {
276 throw new Error("Try to override final method in method:"+md+" declared in "+cd);
281 BlockNode bn=state.getMethodBody(md);
282 checkBlockNode(md, md.getParameterTable(),bn);
285 public void checkBlockNode(Descriptor md, SymbolTable nametable, BlockNode bn) {
286 /* Link in the naming environment */
287 bn.getVarTable().setParent(nametable);
288 for(int i=0; i<bn.size(); i++) {
289 BlockStatementNode bsn=bn.get(i);
290 checkBlockStatementNode(md, bn.getVarTable(),bsn);
294 public void checkBlockStatementNode(Descriptor md, SymbolTable nametable, BlockStatementNode bsn) {
296 case Kind.BlockExpressionNode:
297 checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
300 case Kind.DeclarationNode:
301 checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
304 case Kind.TagDeclarationNode:
305 checkTagDeclarationNode(md, nametable, (TagDeclarationNode)bsn);
308 case Kind.IfStatementNode:
309 checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
312 case Kind.SwitchStatementNode:
313 checkSwitchStatementNode(md, nametable, (SwitchStatementNode)bsn);
317 checkLoopNode(md, nametable, (LoopNode)bsn);
320 case Kind.ReturnNode:
321 checkReturnNode(md, nametable, (ReturnNode)bsn);
324 case Kind.TaskExitNode:
325 checkTaskExitNode(md, nametable, (TaskExitNode)bsn);
328 case Kind.SubBlockNode:
329 checkSubBlockNode(md, nametable, (SubBlockNode)bsn);
332 case Kind.AtomicNode:
333 checkAtomicNode(md, nametable, (AtomicNode)bsn);
336 case Kind.SynchronizedNode:
337 checkSynchronizedNode(md, nametable, (SynchronizedNode)bsn);
340 case Kind.ContinueBreakNode:
341 checkContinueBreakNode(md, nametable, (ContinueBreakNode) bsn);
345 case Kind.GenReachNode:
346 // do nothing, no semantic check for SESEs
353 void checkBlockExpressionNode(Descriptor md, SymbolTable nametable, BlockExpressionNode ben) {
354 checkExpressionNode(md, nametable, ben.getExpression(), null);
357 void checkDeclarationNode(Descriptor md, SymbolTable nametable, DeclarationNode dn) {
358 VarDescriptor vd=dn.getVarDescriptor();
359 checkTypeDescriptor(vd.getType());
360 Descriptor d=nametable.get(vd.getSymbol());
362 (d instanceof FieldDescriptor)) {
365 throw new Error(vd.getSymbol()+" in "+md+" defined a second time");
366 if (dn.getExpression()!=null)
367 checkExpressionNode(md, nametable, dn.getExpression(), vd.getType());
370 void checkTagDeclarationNode(Descriptor md, SymbolTable nametable, TagDeclarationNode dn) {
371 TagVarDescriptor vd=dn.getTagVarDescriptor();
372 Descriptor d=nametable.get(vd.getSymbol());
374 (d instanceof FieldDescriptor)) {
377 throw new Error(vd.getSymbol()+" defined a second time");
380 void checkSubBlockNode(Descriptor md, SymbolTable nametable, SubBlockNode sbn) {
381 checkBlockNode(md, nametable, sbn.getBlockNode());
384 void checkAtomicNode(Descriptor md, SymbolTable nametable, AtomicNode sbn) {
385 checkBlockNode(md, nametable, sbn.getBlockNode());
388 void checkSynchronizedNode(Descriptor md, SymbolTable nametable, SynchronizedNode sbn) {
389 checkBlockNode(md, nametable, sbn.getBlockNode());
390 //todo this could be Object
391 checkExpressionNode(md, nametable, sbn.getExpr(), null);
394 void checkContinueBreakNode(Descriptor md, SymbolTable nametable, ContinueBreakNode cbn) {
395 if (loopstack.empty())
396 throw new Error("continue/break outside of loop");
397 LoopNode ln=(LoopNode)loopstack.peek();
401 void checkReturnNode(Descriptor d, SymbolTable nametable, ReturnNode rn) {
402 if (d instanceof TaskDescriptor)
403 throw new Error("Illegal return appears in Task: "+d.getSymbol());
404 MethodDescriptor md=(MethodDescriptor)d;
405 if (rn.getReturnExpression()!=null)
406 if (md.getReturnType()==null)
407 throw new Error("Constructor can't return something.");
408 else if (md.getReturnType().isVoid())
409 throw new Error(md+" is void");
411 checkExpressionNode(md, nametable, rn.getReturnExpression(), md.getReturnType());
413 if (md.getReturnType()!=null&&!md.getReturnType().isVoid())
414 throw new Error("Need to return something for "+md);
417 void checkTaskExitNode(Descriptor md, SymbolTable nametable, TaskExitNode ten) {
418 if (md instanceof MethodDescriptor)
419 throw new Error("Illegal taskexit appears in Method: "+md.getSymbol());
420 checkFlagEffects((TaskDescriptor)md, ten.getFlagEffects(),nametable);
421 checkConstraintCheck((TaskDescriptor) md, nametable, ten.getChecks());
424 void checkIfStatementNode(Descriptor md, SymbolTable nametable, IfStatementNode isn) {
425 checkExpressionNode(md, nametable, isn.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
426 checkBlockNode(md, nametable, isn.getTrueBlock());
427 if (isn.getFalseBlock()!=null)
428 checkBlockNode(md, nametable, isn.getFalseBlock());
431 void checkSwitchStatementNode(Descriptor md, SymbolTable nametable, SwitchStatementNode ssn) {
432 checkExpressionNode(md, nametable, ssn.getCondition(), new TypeDescriptor(TypeDescriptor.INT));
434 BlockNode sbn = ssn.getSwitchBody();
435 boolean hasdefault = false;
436 for(int i = 0; i < sbn.size(); i++) {
437 boolean containdefault = checkSwitchBlockNode(md, nametable, (SwitchBlockNode)sbn.get(i));
438 if(hasdefault && containdefault) {
439 throw new Error("Error: duplicate default branch in switch-case statement in Method: " + md.getSymbol());
441 hasdefault = containdefault;
445 boolean checkSwitchBlockNode(Descriptor md, SymbolTable nametable, SwitchBlockNode sbn) {
446 Vector<SwitchLabelNode> slnv = sbn.getSwitchConditions();
448 for(int i = 0; i < slnv.size(); i++) {
449 if(slnv.elementAt(i).isdefault) {
452 checkConstantExpressionNode(md, nametable, slnv.elementAt(i).getCondition(), new TypeDescriptor(TypeDescriptor.INT));
456 throw new Error("Error: duplicate default branch in switch-case statement in Method: " + md.getSymbol());
458 checkBlockNode(md, nametable, sbn.getSwitchBlockStatement());
459 return (defaultb > 0);
463 void checkConstantExpressionNode(Descriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
465 case Kind.FieldAccessNode:
466 checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
469 case Kind.LiteralNode:
470 checkLiteralNode(md,nametable,(LiteralNode)en,td);
476 void checkExpressionNode(Descriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
478 case Kind.AssignmentNode:
479 checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
483 checkCastNode(md,nametable,(CastNode)en,td);
486 case Kind.CreateObjectNode:
487 checkCreateObjectNode(md,nametable,(CreateObjectNode)en,td);
490 case Kind.FieldAccessNode:
491 checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
494 case Kind.ArrayAccessNode:
495 checkArrayAccessNode(md,nametable,(ArrayAccessNode)en,td);
498 case Kind.LiteralNode:
499 checkLiteralNode(md,nametable,(LiteralNode)en,td);
502 case Kind.MethodInvokeNode:
503 checkMethodInvokeNode(md,nametable,(MethodInvokeNode)en,td);
507 checkNameNode(md,nametable,(NameNode)en,td);
511 checkOpNode(md,nametable,(OpNode)en,td);
514 case Kind.OffsetNode:
515 checkOffsetNode(md, nametable, (OffsetNode)en, td);
518 case Kind.TertiaryNode:
519 checkTertiaryNode(md, nametable, (TertiaryNode)en, td);
522 case Kind.InstanceOfNode:
523 checkInstanceOfNode(md, nametable, (InstanceOfNode) en, td);
526 case Kind.ArrayInitializerNode:
527 checkArrayInitializerNode(md, nametable, (ArrayInitializerNode) en, td);
533 void checkCastNode(Descriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
534 /* Get type descriptor */
535 if (cn.getType()==null) {
536 NameDescriptor typenamed=cn.getTypeName().getName();
537 String typename=typenamed.toString();
538 TypeDescriptor ntd=new TypeDescriptor(getClass(typename));
542 /* Check the type descriptor */
543 TypeDescriptor cast_type=cn.getType();
544 checkTypeDescriptor(cast_type);
548 if (!typeutil.isSuperorType(td,cast_type))
549 throw new Error("Cast node returns "+cast_type+", but need "+td);
552 ExpressionNode en=cn.getExpression();
553 checkExpressionNode(md, nametable, en, null);
554 TypeDescriptor etd=en.getType();
555 if (typeutil.isSuperorType(cast_type,etd)) /* Cast trivially succeeds */
558 if (typeutil.isSuperorType(etd,cast_type)) /* Cast may succeed */
560 if (typeutil.isCastable(etd, cast_type))
563 /* Different branches */
564 /* TODO: change if add interfaces */
565 throw new Error("Cast will always fail\n"+cn.printNode(0));
568 void checkFieldAccessNode(Descriptor md, SymbolTable nametable, FieldAccessNode fan, TypeDescriptor td) {
569 ExpressionNode left=fan.getExpression();
570 checkExpressionNode(md,nametable,left,null);
571 TypeDescriptor ltd=left.getType();
572 String fieldname=fan.getFieldName();
574 FieldDescriptor fd=null;
575 if (ltd.isArray()&&fieldname.equals("length"))
576 fd=FieldDescriptor.arrayLength;
578 fd=(FieldDescriptor) ltd.getClassDesc().getFieldTable().get(fieldname);
580 // TODO add version for normal Java later
582 if(ltd.getClassDesc().isEnum()) {
583 int value = ltd.getClassDesc().getEnumConstant(fieldname);
585 // check if this field is an enum constant
586 throw new Error(fieldname + " is not an enum constant in "+fan.printNode(0)+" in "+md);
588 fd = new FieldDescriptor(new Modifiers(Modifiers.PUBLIC|Modifiers.FINAL), new TypeDescriptor(TypeDescriptor.INT), fieldname, null, false);
590 fd.setEnumValue(value);
591 } else if(!fd.isStatic()) {
592 // check if this field is a static field
593 throw new Error("Dereference of the non-static field "+ fieldname + " in "+fan.printNode(0)+" in "+md);
598 throw new Error("Unknown field "+fieldname + " in "+fan.printNode(0)+" in "+md);
600 if (fd.getType().iswrapper()) {
601 FieldAccessNode fan2=new FieldAccessNode(left, fieldname);
604 fan.fieldname="value";
606 ExpressionNode leftwr=fan.getExpression();
607 TypeDescriptor ltdwr=leftwr.getType();
608 String fieldnamewr=fan.getFieldName();
609 FieldDescriptor fdwr=(FieldDescriptor) ltdwr.getClassDesc().getFieldTable().get(fieldnamewr);
612 throw new Error("Unknown field "+fieldnamewr + " in "+fan.printNode(0)+" in "+md);
617 if (!typeutil.isSuperorType(td,fan.getType()))
618 throw new Error("Field node returns "+fan.getType()+", but need "+td);
622 void checkArrayAccessNode(Descriptor md, SymbolTable nametable, ArrayAccessNode aan, TypeDescriptor td) {
623 ExpressionNode left=aan.getExpression();
624 checkExpressionNode(md,nametable,left,null);
626 checkExpressionNode(md,nametable,aan.getIndex(),new TypeDescriptor(TypeDescriptor.INT));
627 TypeDescriptor ltd=left.getType();
628 if (ltd.dereference().iswrapper()) {
629 aan.wrappertype=((FieldDescriptor)ltd.dereference().getClassDesc().getFieldTable().get("value")).getType();
633 if (!typeutil.isSuperorType(td,aan.getType()))
634 throw new Error("Field node returns "+aan.getType()+", but need "+td);
637 void checkLiteralNode(Descriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
638 /* Resolve the type */
639 Object o=ln.getValue();
640 if (ln.getTypeString().equals("null")) {
641 ln.setType(new TypeDescriptor(TypeDescriptor.NULL));
642 } else if (o instanceof Integer) {
643 ln.setType(new TypeDescriptor(TypeDescriptor.INT));
644 } else if (o instanceof Long) {
645 ln.setType(new TypeDescriptor(TypeDescriptor.LONG));
646 } else if (o instanceof Float) {
647 ln.setType(new TypeDescriptor(TypeDescriptor.FLOAT));
648 } else if (o instanceof Boolean) {
649 ln.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
650 } else if (o instanceof Double) {
651 ln.setType(new TypeDescriptor(TypeDescriptor.DOUBLE));
652 } else if (o instanceof Character) {
653 ln.setType(new TypeDescriptor(TypeDescriptor.CHAR));
654 } else if (o instanceof String) {
655 ln.setType(new TypeDescriptor(getClass(TypeUtil.StringClass)));
659 if (!typeutil.isSuperorType(td,ln.getType()))
660 throw new Error("Field node returns "+ln.getType()+", but need "+td+" in "+md);
663 void checkNameNode(Descriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
664 NameDescriptor nd=nn.getName();
665 if (nd.getBase()!=null) {
667 /* Rewrite NameNode */
668 ExpressionNode en=translateNameDescriptorintoExpression(nd);
669 nn.setExpression(en);
670 checkExpressionNode(md,nametable,en,td);
672 String varname=nd.toString();
673 Descriptor d=(Descriptor)nametable.get(varname);
676 // TODO add version for normal Java later
677 ClassDescriptor cd = null;
678 if(((MethodDescriptor)md).isStaticBlock()) {
679 // this is a static block, all the accessed fields should be static field
680 cd = ((MethodDescriptor)md).getClassDesc();
681 SymbolTable fieldtbl = cd.getFieldTable();
682 FieldDescriptor fd=(FieldDescriptor)fieldtbl.get(varname);
683 if((fd == null) || (!fd.isStatic())){
684 // no such field in the class or it is not a static field
685 throw new Error("Name "+varname+" should not be used in static block: "+md);
687 // this is a static field
693 cd=getClass(varname);
695 // this is a class name
699 throw new Error("Name "+varname+" undefined in: "+md);
703 throw new Error("Name "+varname+" undefined in: "+md);
706 if (d instanceof VarDescriptor) {
708 } else if (d instanceof FieldDescriptor) {
709 FieldDescriptor fd=(FieldDescriptor)d;
710 if (fd.getType().iswrapper()) {
711 String id=nd.getIdentifier();
712 NameDescriptor base=nd.getBase();
713 NameNode n=new NameNode(nn.getName());
715 n.setVar((VarDescriptor)nametable.get("this")); /* Need a pointer to this */
716 FieldAccessNode fan=new FieldAccessNode(n,"value");
717 FieldDescriptor fdval=(FieldDescriptor) fd.getType().getClassDesc().getFieldTable().get("value");
719 nn.setExpression(fan);
722 nn.setVar((VarDescriptor)nametable.get("this")); /* Need a pointer to this */
724 } else if (d instanceof TagVarDescriptor) {
726 } else throw new Error("Wrong type of descriptor");
728 if (!typeutil.isSuperorType(td,nn.getType()))
729 throw new Error("Field node returns "+nn.getType()+", but need "+td);
733 void checkOffsetNode(Descriptor md, SymbolTable nameTable, OffsetNode ofn, TypeDescriptor td) {
734 TypeDescriptor ltd=ofn.td;
735 checkTypeDescriptor(ltd);
737 String fieldname = ofn.fieldname;
738 FieldDescriptor fd=null;
739 if (ltd.isArray()&&fieldname.equals("length")) {
740 fd=FieldDescriptor.arrayLength;
742 fd=(FieldDescriptor) ltd.getClassDesc().getFieldTable().get(fieldname);
746 checkField(ltd.getClassDesc(), fd);
749 throw new Error("Unknown field "+fieldname + " in "+ofn.printNode(1)+" in "+md);
752 if (!typeutil.isSuperorType(td, ofn.getType())) {
753 System.out.println(td);
754 System.out.println(ofn.getType());
755 throw new Error("Type of rside not compatible with type of lside"+ofn.printNode(0));
761 void checkTertiaryNode(Descriptor md, SymbolTable nametable, TertiaryNode tn, TypeDescriptor td) {
762 checkExpressionNode(md, nametable, tn.getCond(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
763 checkExpressionNode(md, nametable, tn.getTrueExpr(), td );
764 checkExpressionNode(md, nametable, tn.getFalseExpr(), td );
767 void checkInstanceOfNode(Descriptor md, SymbolTable nametable, InstanceOfNode tn, TypeDescriptor td) {
768 if (td!=null&&!td.isBoolean())
769 throw new Error("Expecting type "+td+"for instanceof expression");
771 checkTypeDescriptor(tn.getExprType());
772 checkExpressionNode(md, nametable, tn.getExpr(), null);
775 void checkArrayInitializerNode(Descriptor md, SymbolTable nametable, ArrayInitializerNode ain, TypeDescriptor td) {
776 Vector<TypeDescriptor> vec_type = new Vector<TypeDescriptor>();
777 for( int i = 0; i < ain.numVarInitializers(); ++i ) {
778 checkExpressionNode(md, nametable, ain.getVarInitializer(i), td==null?td:td.dereference());
779 vec_type.add(ain.getVarInitializer(i).getType());
781 // descide the type of this variableInitializerNode
782 TypeDescriptor out_type = vec_type.elementAt(0);
783 for(int i = 1; i < vec_type.size(); i++) {
784 TypeDescriptor tmp_type = vec_type.elementAt(i);
785 if(out_type == null) {
786 if(tmp_type != null) {
789 } else if(out_type.isNull()) {
790 if(!tmp_type.isNull() ) {
791 if(!tmp_type.isArray()) {
792 throw new Error("Error: mixed type in var initializer list");
797 } else if(out_type.isArray()) {
798 if(tmp_type.isArray()) {
799 if(tmp_type.getArrayCount() > out_type.getArrayCount()) {
802 } else if((tmp_type != null) && (!tmp_type.isNull())) {
803 throw new Error("Error: mixed type in var initializer list");
805 } else if(out_type.isInt()) {
806 if(!tmp_type.isInt()) {
807 throw new Error("Error: mixed type in var initializer list");
809 } else if(out_type.isString()) {
810 if(!tmp_type.isString()) {
811 throw new Error("Error: mixed type in var initializer list");
815 if(out_type != null) {
816 out_type = out_type.makeArray(state);
818 ain.setType(out_type);
821 void checkAssignmentNode(Descriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
822 boolean postinc=true;
823 if (an.getOperation().getBaseOp()==null||
824 (an.getOperation().getBaseOp().getOp()!=Operation.POSTINC&&
825 an.getOperation().getBaseOp().getOp()!=Operation.POSTDEC))
828 checkExpressionNode(md, nametable, an.getSrc(),td);
829 //TODO: Need check on validity of operation here
830 if (!((an.getDest() instanceof FieldAccessNode)||
831 (an.getDest() instanceof ArrayAccessNode)||
832 (an.getDest() instanceof NameNode)))
833 throw new Error("Bad lside in "+an.printNode(0));
834 checkExpressionNode(md, nametable, an.getDest(), null);
836 /* We want parameter variables to tasks to be immutable */
837 if (md instanceof TaskDescriptor) {
838 if (an.getDest() instanceof NameNode) {
839 NameNode nn=(NameNode)an.getDest();
840 if (nn.getVar()!=null) {
841 if (((TaskDescriptor)md).getParameterTable().contains(nn.getVar().getSymbol()))
842 throw new Error("Can't modify parameter "+nn.getVar()+ " to task "+td.getSymbol());
847 if (an.getDest().getType().isString()&&an.getOperation().getOp()==AssignOperation.PLUSEQ) {
849 ClassDescriptor stringcl=getClass(TypeUtil.StringClass);
850 TypeDescriptor stringtd=new TypeDescriptor(stringcl);
851 NameDescriptor nd=new NameDescriptor("String");
852 NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
854 if (!(an.getSrc().getType().isString()&&(an.getSrc() instanceof OpNode))) {
855 MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
856 rightmin.addArgument(an.getSrc());
858 checkExpressionNode(md, nametable, an.getSrc(), null);
862 if (!postinc&&!typeutil.isSuperorType(an.getDest().getType(),an.getSrc().getType())) {
863 throw new Error("Type of rside ("+an.getSrc().getType().toPrettyString()+") not compatible with type of lside ("+an.getDest().getType().toPrettyString()+")"+an.printNode(0));
867 void checkLoopNode(Descriptor md, SymbolTable nametable, LoopNode ln) {
869 if (ln.getType()==LoopNode.WHILELOOP||ln.getType()==LoopNode.DOWHILELOOP) {
870 checkExpressionNode(md, nametable, ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
871 checkBlockNode(md, nametable, ln.getBody());
874 /* Link in the initializer naming environment */
875 BlockNode bn=ln.getInitializer();
876 bn.getVarTable().setParent(nametable);
877 for(int i=0; i<bn.size(); i++) {
878 BlockStatementNode bsn=bn.get(i);
879 checkBlockStatementNode(md, bn.getVarTable(),bsn);
881 //check the condition
882 checkExpressionNode(md, bn.getVarTable(), ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
883 checkBlockNode(md, bn.getVarTable(), ln.getBody());
884 checkBlockNode(md, bn.getVarTable(), ln.getUpdate());
890 void checkCreateObjectNode(Descriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
891 TypeDescriptor[] tdarray=new TypeDescriptor[con.numArgs()];
892 for(int i=0; i<con.numArgs(); i++) {
893 ExpressionNode en=con.getArg(i);
894 checkExpressionNode(md,nametable,en,null);
895 tdarray[i]=en.getType();
898 TypeDescriptor typetolookin=con.getType();
899 checkTypeDescriptor(typetolookin);
901 if (td!=null&&!typeutil.isSuperorType(td, typetolookin))
902 throw new Error(typetolookin + " isn't a "+td);
904 /* Check flag effects */
905 if (con.getFlagEffects()!=null) {
906 FlagEffects fe=con.getFlagEffects();
907 ClassDescriptor cd=typetolookin.getClassDesc();
909 for(int j=0; j<fe.numEffects(); j++) {
910 FlagEffect flag=fe.getEffect(j);
911 String name=flag.getName();
912 FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
913 //Make sure the flag is declared
915 throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
916 if (flag_d.getExternal())
917 throw new Error("Attempting to modify external flag: "+name);
918 flag.setFlag(flag_d);
920 for(int j=0; j<fe.numTagEffects(); j++) {
921 TagEffect tag=fe.getTagEffect(j);
922 String name=tag.getName();
924 Descriptor d=(Descriptor)nametable.get(name);
926 throw new Error("Tag descriptor "+name+" undeclared");
927 else if (!(d instanceof TagVarDescriptor))
928 throw new Error(name+" is not a tag descriptor");
929 tag.setTag((TagVarDescriptor)d);
933 if ((!typetolookin.isClass())&&(!typetolookin.isArray()))
934 throw new Error("Can't allocate primitive type:"+con.printNode(0));
936 if (!typetolookin.isArray()) {
937 //Array's don't need constructor calls
938 ClassDescriptor classtolookin=typetolookin.getClassDesc();
940 Set methoddescriptorset=classtolookin.getMethodTable().getSet(typetolookin.getSymbol());
941 MethodDescriptor bestmd=null;
943 for(Iterator methodit=methoddescriptorset.iterator(); methodit.hasNext();) {
944 MethodDescriptor currmd=(MethodDescriptor)methodit.next();
945 /* Need correct number of parameters */
946 if (con.numArgs()!=currmd.numParameters())
948 for(int i=0; i<con.numArgs(); i++) {
949 if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
952 /* Local allocations can't call global allocator */
953 if (!con.isGlobal()&&currmd.isGlobal())
956 /* Method okay so far */
960 if (typeutil.isMoreSpecific(currmd,bestmd)) {
962 } else if (con.isGlobal()&&match(currmd, bestmd)) {
963 if (currmd.isGlobal()&&!bestmd.isGlobal())
965 else if (currmd.isGlobal()&&bestmd.isGlobal())
967 } else if (!typeutil.isMoreSpecific(bestmd, currmd)) {
968 throw new Error("No method is most specific");
971 /* Is this more specific than bestmd */
975 throw new Error("No method found for "+con.printNode(0)+" in "+md);
976 con.setConstructor(bestmd);
981 /** Check to see if md1 is the same specificity as md2.*/
983 boolean match(MethodDescriptor md1, MethodDescriptor md2) {
984 /* Checks if md1 is more specific than md2 */
985 if (md1.numParameters()!=md2.numParameters())
987 for(int i=0; i<md1.numParameters(); i++) {
988 if (!md2.getParamType(i).equals(md1.getParamType(i)))
991 if (!md2.getReturnType().equals(md1.getReturnType()))
994 if (!md2.getClassDesc().equals(md1.getClassDesc()))
1002 ExpressionNode translateNameDescriptorintoExpression(NameDescriptor nd) {
1003 String id=nd.getIdentifier();
1004 NameDescriptor base=nd.getBase();
1006 return new NameNode(nd);
1008 return new FieldAccessNode(translateNameDescriptorintoExpression(base),id);
1012 void checkMethodInvokeNode(Descriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
1013 /*Typecheck subexpressions
1014 and get types for expressions*/
1016 TypeDescriptor[] tdarray=new TypeDescriptor[min.numArgs()];
1017 for(int i=0; i<min.numArgs(); i++) {
1018 ExpressionNode en=min.getArg(i);
1019 checkExpressionNode(md,nametable,en,null);
1020 tdarray[i]=en.getType();
1021 if(state.MGC && en.getType().isClass() && en.getType().getClassDesc().isEnum()) {
1022 tdarray[i] = new TypeDescriptor(TypeDescriptor.INT);
1025 TypeDescriptor typetolookin=null;
1026 if (min.getExpression()!=null) {
1027 checkExpressionNode(md,nametable,min.getExpression(),null);
1028 typetolookin=min.getExpression().getType();
1029 //if (typetolookin==null)
1030 //throw new Error(md+" has null return type");
1032 } else if (min.getBaseName()!=null) {
1033 String rootname=min.getBaseName().getRoot();
1034 if (rootname.equals("super")) {
1035 ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
1036 typetolookin=new TypeDescriptor(supercd);
1037 } else if (nametable.get(rootname)!=null) {
1038 //we have an expression
1039 min.setExpression(translateNameDescriptorintoExpression(min.getBaseName()));
1040 checkExpressionNode(md, nametable, min.getExpression(), null);
1041 typetolookin=min.getExpression().getType();
1045 if (min.getBaseName().getSymbol().equals("System.out"))
1046 cd=getClass("System");
1048 cd=getClass(min.getBaseName().getSymbol());
1050 throw new Error("md = "+ md.toString()+ " "+min.getBaseName()+" undefined");
1051 typetolookin=new TypeDescriptor(cd);
1053 } else if ((md instanceof MethodDescriptor)&&min.getMethodName().equals("super")) {
1054 ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
1055 min.methodid=supercd.getSymbol();
1056 typetolookin=new TypeDescriptor(supercd);
1057 } else if (md instanceof MethodDescriptor) {
1058 typetolookin=new TypeDescriptor(((MethodDescriptor)md).getClassDesc());
1060 /* If this a task descriptor we throw an error at this point */
1061 throw new Error("Unknown method call to "+min.getMethodName()+"in task"+md.getSymbol());
1063 if (!typetolookin.isClass())
1064 throw new Error("Error with method call to "+min.getMethodName());
1065 ClassDescriptor classtolookin=typetolookin.getClassDesc();
1066 //System.out.println("Method name="+min.getMethodName());
1068 Set methoddescriptorset=classtolookin.getMethodTable().getSet(min.getMethodName());
1069 MethodDescriptor bestmd=null;
1071 for(Iterator methodit=methoddescriptorset.iterator(); methodit.hasNext();) {
1072 MethodDescriptor currmd=(MethodDescriptor)methodit.next();
1073 /* Need correct number of parameters */
1074 if (min.numArgs()!=currmd.numParameters())
1076 for(int i=0; i<min.numArgs(); i++) {
1077 if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
1078 continue NextMethod;
1080 /* Method okay so far */
1084 if (typeutil.isMoreSpecific(currmd,bestmd)) {
1086 } else if (!typeutil.isMoreSpecific(bestmd, currmd))
1087 throw new Error("No method is most specific");
1089 /* Is this more specific than bestmd */
1093 throw new Error("No method found for :"+min.printNode(0)+" in class: " + classtolookin+" in "+md);
1094 min.setMethod(bestmd);
1096 if ((td!=null)&&(min.getType()!=null)&&!typeutil.isSuperorType(td, min.getType()))
1097 throw new Error(min.getType()+ " is not equal to or a subclass of "+td);
1098 /* Check whether we need to set this parameter to implied this */
1099 if (!bestmd.isStatic()) {
1100 if (min.getExpression()==null) {
1101 ExpressionNode en=new NameNode(new NameDescriptor("this"));
1102 min.setExpression(en);
1103 checkExpressionNode(md, nametable, min.getExpression(), null);
1109 void checkOpNode(Descriptor md, SymbolTable nametable, OpNode on, TypeDescriptor td) {
1110 checkExpressionNode(md, nametable, on.getLeft(), null);
1111 if (on.getRight()!=null)
1112 checkExpressionNode(md, nametable, on.getRight(), null);
1113 TypeDescriptor ltd=on.getLeft().getType();
1114 TypeDescriptor rtd=on.getRight()!=null ? on.getRight().getType() : null;
1115 TypeDescriptor lefttype=null;
1116 TypeDescriptor righttype=null;
1117 Operation op=on.getOp();
1119 switch(op.getOp()) {
1120 case Operation.LOGIC_OR:
1121 case Operation.LOGIC_AND:
1122 if (!(rtd.isBoolean()))
1124 on.setRightType(rtd);
1126 case Operation.LOGIC_NOT:
1127 if (!(ltd.isBoolean()))
1130 on.setLeftType(ltd);
1132 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
1135 case Operation.COMP:
1136 // 5.6.2 Binary Numeric Promotion
1137 //TODO unboxing of reference objects
1140 else if (ltd.isFloat())
1142 else if (ltd.isLong())
1143 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
1145 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1146 on.setLeftType(lefttype);
1147 on.setType(lefttype);
1150 case Operation.BIT_OR:
1151 case Operation.BIT_XOR:
1152 case Operation.BIT_AND:
1153 // 5.6.2 Binary Numeric Promotion
1154 //TODO unboxing of reference objects
1155 if (ltd.isDouble()||rtd.isDouble())
1157 else if (ltd.isFloat()||rtd.isFloat())
1159 else if (ltd.isLong()||rtd.isLong())
1160 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
1161 // 090205 hack for boolean
1162 else if (ltd.isBoolean()||rtd.isBoolean())
1163 lefttype=new TypeDescriptor(TypeDescriptor.BOOLEAN);
1165 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1168 on.setLeftType(lefttype);
1169 on.setRightType(righttype);
1170 on.setType(lefttype);
1173 case Operation.ISAVAILABLE:
1174 if (!(ltd.isPtr())) {
1175 throw new Error("Can't use isavailable on non-pointers/non-parameters.");
1178 on.setLeftType(lefttype);
1179 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
1182 case Operation.EQUAL:
1183 case Operation.NOTEQUAL:
1184 // 5.6.2 Binary Numeric Promotion
1185 //TODO unboxing of reference objects
1186 if (ltd.isBoolean()||rtd.isBoolean()) {
1187 if (!(ltd.isBoolean()&&rtd.isBoolean()))
1189 righttype=lefttype=new TypeDescriptor(TypeDescriptor.BOOLEAN);
1190 } else if (ltd.isPtr()||rtd.isPtr()) {
1191 if (!(ltd.isPtr()&&rtd.isPtr()))
1195 } else if (ltd.isDouble()||rtd.isDouble())
1196 righttype=lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
1197 else if (ltd.isFloat()||rtd.isFloat())
1198 righttype=lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
1199 else if (ltd.isLong()||rtd.isLong())
1200 righttype=lefttype=new TypeDescriptor(TypeDescriptor.LONG);
1202 righttype=lefttype=new TypeDescriptor(TypeDescriptor.INT);
1204 on.setLeftType(lefttype);
1205 on.setRightType(righttype);
1206 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
1215 // 5.6.2 Binary Numeric Promotion
1216 //TODO unboxing of reference objects
1217 if (!ltd.isNumber()||!rtd.isNumber()) {
1218 if (!ltd.isNumber())
1219 throw new Error("Leftside is not number"+on.printNode(0)+"type="+ltd.toPrettyString());
1220 if (!rtd.isNumber())
1221 throw new Error("Rightside is not number"+on.printNode(0));
1224 if (ltd.isDouble()||rtd.isDouble())
1225 lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
1226 else if (ltd.isFloat()||rtd.isFloat())
1227 lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
1228 else if (ltd.isLong()||rtd.isLong())
1229 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
1231 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1233 on.setLeftType(lefttype);
1234 on.setRightType(righttype);
1235 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
1239 if (ltd.isString()||rtd.isString()) {
1240 ClassDescriptor stringcl=getClass(TypeUtil.StringClass);
1241 TypeDescriptor stringtd=new TypeDescriptor(stringcl);
1242 NameDescriptor nd=new NameDescriptor("String");
1243 NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
1244 if (!(ltd.isString()&&(on.getLeft() instanceof OpNode))) {
1245 MethodInvokeNode leftmin=new MethodInvokeNode(valuend);
1246 leftmin.addArgument(on.getLeft());
1248 checkExpressionNode(md, nametable, on.getLeft(), null);
1251 if (!(rtd.isString()&&(on.getRight() instanceof OpNode))) {
1252 MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
1253 rightmin.addArgument(on.getRight());
1255 checkExpressionNode(md, nametable, on.getRight(), null);
1258 on.setLeftType(stringtd);
1259 on.setRightType(stringtd);
1260 on.setType(stringtd);
1265 case Operation.MULT:
1268 // 5.6.2 Binary Numeric Promotion
1269 //TODO unboxing of reference objects
1270 if (ltd.isArray()||rtd.isArray()||!ltd.isNumber()||!rtd.isNumber())
1271 throw new Error("Error in "+on.printNode(0));
1273 if (ltd.isDouble()||rtd.isDouble())
1274 lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
1275 else if (ltd.isFloat()||rtd.isFloat())
1276 lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
1277 else if (ltd.isLong()||rtd.isLong())
1278 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
1280 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1282 on.setLeftType(lefttype);
1283 on.setRightType(righttype);
1284 on.setType(lefttype);
1287 case Operation.LEFTSHIFT:
1288 case Operation.RIGHTSHIFT:
1289 case Operation.URIGHTSHIFT:
1290 if (!rtd.isIntegerType())
1292 //5.6.1 Unary Numeric Promotion
1293 if (rtd.isByte()||rtd.isShort()||rtd.isInt())
1294 righttype=new TypeDescriptor(TypeDescriptor.INT);
1298 on.setRightType(righttype);
1299 if (!ltd.isIntegerType())
1302 case Operation.UNARYPLUS:
1303 case Operation.UNARYMINUS:
1304 /* case Operation.POSTINC:
1305 case Operation.POSTDEC:
1306 case Operation.PREINC:
1307 case Operation.PREDEC:*/
1308 if (!ltd.isNumber())
1310 //5.6.1 Unary Numeric Promotion
1311 if (ltd.isByte()||ltd.isShort()||ltd.isInt())
1312 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1315 on.setLeftType(lefttype);
1316 on.setType(lefttype);
1320 throw new Error(op.toString());
1324 if (!typeutil.isSuperorType(td, on.getType())) {
1325 System.out.println(td);
1326 System.out.println(on.getType());
1327 throw new Error("Type of rside not compatible with type of lside"+on.printNode(0));