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();
18 // Do descriptors first
20 ClassDescriptor cd=(ClassDescriptor)it.next();
21 //System.out.println("Checking class: "+cd);
22 //Set superclass link up
23 if (cd.getSuper()!=null) {
24 cd.setSuper(typeutil.getClass(cd.getSuper()));
25 // Link together Field, Method, and Flag tables so classes
26 // inherit these from their superclasses
27 cd.getFieldTable().setParent(cd.getSuperDesc().getFieldTable());
28 cd.getMethodTable().setParent(cd.getSuperDesc().getMethodTable());
29 cd.getFlagTable().setParent(cd.getSuperDesc().getFlagTable());
32 /* Check to see that fields are well typed */
33 for(Iterator field_it=cd.getFields(); field_it.hasNext();) {
34 FieldDescriptor fd=(FieldDescriptor)field_it.next();
35 //System.out.println("Checking field: "+fd);
39 for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
40 MethodDescriptor md=(MethodDescriptor)method_it.next();
45 it=classtable.getDescriptorsIterator();
46 // Do descriptors first
48 ClassDescriptor cd=(ClassDescriptor)it.next();
49 for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
50 MethodDescriptor md=(MethodDescriptor)method_it.next();
51 checkMethodBody(cd,md);
55 for(Iterator task_it=state.getTaskSymbolTable().getDescriptorsIterator(); task_it.hasNext();) {
56 TaskDescriptor td=(TaskDescriptor)task_it.next();
62 public void checkTypeDescriptor(TypeDescriptor td) {
65 else if (td.isClass()) {
66 String name=td.toString();
67 ClassDescriptor field_cd=(ClassDescriptor)state.getClassSymbolTable().get(name);
69 throw new Error("Undefined class "+name);
70 td.setClassDescriptor(field_cd);
72 } else if (td.isTag())
78 public void checkField(ClassDescriptor cd, FieldDescriptor fd) {
79 checkTypeDescriptor(fd.getType());
82 public void checkConstraintCheck(TaskDescriptor td, SymbolTable nametable, Vector ccs) {
84 return; /* No constraint checks to check */
85 for(int i=0; i<ccs.size(); i++) {
86 ConstraintCheck cc=(ConstraintCheck) ccs.get(i);
88 for(int j=0; j<cc.numArgs(); j++) {
89 ExpressionNode en=cc.getArg(j);
90 checkExpressionNode(td,nametable,en,null);
95 public void checkFlagEffects(TaskDescriptor td, Vector vfe, SymbolTable nametable) {
97 return; /* No flag effects to check */
98 for(int i=0; i<vfe.size(); i++) {
99 FlagEffects fe=(FlagEffects) vfe.get(i);
100 String varname=fe.getName();
101 //Make sure the variable is declared as a parameter to the task
102 VarDescriptor vd=(VarDescriptor)td.getParameterTable().get(varname);
104 throw new Error("Parameter "+varname+" in Flag Effects not declared in "+td);
107 //Make sure it correspods to a class
108 TypeDescriptor type_d=vd.getType();
109 if (!type_d.isClass())
110 throw new Error("Cannot have non-object argument for flag_effect");
112 ClassDescriptor cd=type_d.getClassDesc();
113 for(int j=0; j<fe.numEffects(); j++) {
114 FlagEffect flag=fe.getEffect(j);
115 String name=flag.getName();
116 FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
117 //Make sure the flag is declared
119 throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
120 if (flag_d.getExternal())
121 throw new Error("Attempting to modify external flag: "+name);
122 flag.setFlag(flag_d);
124 for(int j=0; j<fe.numTagEffects(); j++) {
125 TagEffect tag=fe.getTagEffect(j);
126 String name=tag.getName();
128 Descriptor d=(Descriptor)nametable.get(name);
130 throw new Error("Tag descriptor "+name+" undeclared");
131 else if (!(d instanceof TagVarDescriptor))
132 throw new Error(name+" is not a tag descriptor");
133 tag.setTag((TagVarDescriptor)d);
138 public void checkTask(TaskDescriptor td) {
139 for(int i=0; i<td.numParameters(); i++) {
140 /* Check that parameter is well typed */
141 TypeDescriptor param_type=td.getParamType(i);
142 checkTypeDescriptor(param_type);
144 /* Check the parameter's flag expression is well formed */
145 FlagExpressionNode fen=td.getFlag(td.getParameter(i));
146 if (!param_type.isClass())
147 throw new Error("Cannot have non-object argument to a task");
148 ClassDescriptor cd=param_type.getClassDesc();
150 checkFlagExpressionNode(cd, fen);
153 checkFlagEffects(td, td.getFlagEffects(),td.getParameterTable());
154 /* Check that the task code is valid */
155 BlockNode bn=state.getMethodBody(td);
156 checkBlockNode(td, td.getParameterTable(),bn);
159 public void checkFlagExpressionNode(ClassDescriptor cd, FlagExpressionNode fen) {
161 case Kind.FlagOpNode:
163 FlagOpNode fon=(FlagOpNode)fen;
164 checkFlagExpressionNode(cd, fon.getLeft());
165 if (fon.getRight()!=null)
166 checkFlagExpressionNode(cd, fon.getRight());
172 FlagNode fn=(FlagNode)fen;
173 String name=fn.getFlagName();
174 FlagDescriptor fd=(FlagDescriptor)cd.getFlagTable().get(name);
176 throw new Error("Undeclared flag: "+name);
182 throw new Error("Unrecognized FlagExpressionNode");
186 public void checkMethod(ClassDescriptor cd, MethodDescriptor md) {
187 /* Check return type */
188 if (!md.isConstructor())
189 if (!md.getReturnType().isVoid())
190 checkTypeDescriptor(md.getReturnType());
192 for(int i=0; i<md.numParameters(); i++) {
193 TypeDescriptor param_type=md.getParamType(i);
194 checkTypeDescriptor(param_type);
196 /* Link the naming environments */
197 if (!md.isStatic()) /* Fields aren't accessible directly in a static method, so don't link in this table */
198 md.getParameterTable().setParent(cd.getFieldTable());
200 if (!md.isStatic()) {
201 VarDescriptor thisvd=new VarDescriptor(new TypeDescriptor(cd),"this");
206 public void checkMethodBody(ClassDescriptor cd, MethodDescriptor md) {
207 ClassDescriptor superdesc=cd.getSuperDesc();
208 if (superdesc!=null) {
209 Set possiblematches=superdesc.getMethodTable().getSet(md.getSymbol());
210 for(Iterator methodit=possiblematches.iterator(); methodit.hasNext();) {
211 MethodDescriptor matchmd=(MethodDescriptor)methodit.next();
212 if (md.matches(matchmd)) {
213 if (matchmd.getModifiers().isFinal()) {
214 throw new Error("Try to override final method in method:"+md+" declared in "+cd);
219 BlockNode bn=state.getMethodBody(md);
220 checkBlockNode(md, md.getParameterTable(),bn);
223 public void checkBlockNode(Descriptor md, SymbolTable nametable, BlockNode bn) {
224 /* Link in the naming environment */
225 bn.getVarTable().setParent(nametable);
226 for(int i=0; i<bn.size(); i++) {
227 BlockStatementNode bsn=bn.get(i);
228 checkBlockStatementNode(md, bn.getVarTable(),bsn);
232 public void checkBlockStatementNode(Descriptor md, SymbolTable nametable, BlockStatementNode bsn) {
234 case Kind.BlockExpressionNode:
235 checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
238 case Kind.DeclarationNode:
239 checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
242 case Kind.TagDeclarationNode:
243 checkTagDeclarationNode(md, nametable, (TagDeclarationNode)bsn);
246 case Kind.IfStatementNode:
247 checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
251 checkLoopNode(md, nametable, (LoopNode)bsn);
254 case Kind.ReturnNode:
255 checkReturnNode(md, nametable, (ReturnNode)bsn);
258 case Kind.TaskExitNode:
259 checkTaskExitNode(md, nametable, (TaskExitNode)bsn);
262 case Kind.SubBlockNode:
263 checkSubBlockNode(md, nametable, (SubBlockNode)bsn);
266 case Kind.AtomicNode:
267 checkAtomicNode(md, nametable, (AtomicNode)bsn);
273 void checkBlockExpressionNode(Descriptor md, SymbolTable nametable, BlockExpressionNode ben) {
274 checkExpressionNode(md, nametable, ben.getExpression(), null);
277 void checkDeclarationNode(Descriptor md, SymbolTable nametable, DeclarationNode dn) {
278 VarDescriptor vd=dn.getVarDescriptor();
279 checkTypeDescriptor(vd.getType());
280 Descriptor d=nametable.get(vd.getSymbol());
282 (d instanceof FieldDescriptor)) {
285 throw new Error(vd.getSymbol()+" in "+md+" defined a second time");
286 if (dn.getExpression()!=null)
287 checkExpressionNode(md, nametable, dn.getExpression(), vd.getType());
290 void checkTagDeclarationNode(Descriptor md, SymbolTable nametable, TagDeclarationNode dn) {
291 TagVarDescriptor vd=dn.getTagVarDescriptor();
292 Descriptor d=nametable.get(vd.getSymbol());
294 (d instanceof FieldDescriptor)) {
297 throw new Error(vd.getSymbol()+" defined a second time");
300 void checkSubBlockNode(Descriptor md, SymbolTable nametable, SubBlockNode sbn) {
301 checkBlockNode(md, nametable, sbn.getBlockNode());
304 void checkAtomicNode(Descriptor md, SymbolTable nametable, AtomicNode sbn) {
305 checkBlockNode(md, nametable, sbn.getBlockNode());
308 void checkReturnNode(Descriptor d, SymbolTable nametable, ReturnNode rn) {
309 if (d instanceof TaskDescriptor)
310 throw new Error("Illegal return appears in Task: "+d.getSymbol());
311 MethodDescriptor md=(MethodDescriptor)d;
312 if (rn.getReturnExpression()!=null)
313 if (md.getReturnType()==null)
314 throw new Error("Constructor can't return something.");
315 else if (md.getReturnType().isVoid())
316 throw new Error(md+" is void");
318 checkExpressionNode(md, nametable, rn.getReturnExpression(), md.getReturnType());
320 if (md.getReturnType()!=null&&!md.getReturnType().isVoid())
321 throw new Error("Need to return something for "+md);
324 void checkTaskExitNode(Descriptor md, SymbolTable nametable, TaskExitNode ten) {
325 if (md instanceof MethodDescriptor)
326 throw new Error("Illegal taskexit appears in Method: "+md.getSymbol());
327 checkFlagEffects((TaskDescriptor)md, ten.getFlagEffects(),nametable);
328 checkConstraintCheck((TaskDescriptor) md, nametable, ten.getChecks());
331 void checkIfStatementNode(Descriptor md, SymbolTable nametable, IfStatementNode isn) {
332 checkExpressionNode(md, nametable, isn.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
333 checkBlockNode(md, nametable, isn.getTrueBlock());
334 if (isn.getFalseBlock()!=null)
335 checkBlockNode(md, nametable, isn.getFalseBlock());
338 void checkExpressionNode(Descriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
340 case Kind.AssignmentNode:
341 checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
345 checkCastNode(md,nametable,(CastNode)en,td);
348 case Kind.CreateObjectNode:
349 checkCreateObjectNode(md,nametable,(CreateObjectNode)en,td);
352 case Kind.FieldAccessNode:
353 checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
356 case Kind.ArrayAccessNode:
357 checkArrayAccessNode(md,nametable,(ArrayAccessNode)en,td);
360 case Kind.LiteralNode:
361 checkLiteralNode(md,nametable,(LiteralNode)en,td);
364 case Kind.MethodInvokeNode:
365 checkMethodInvokeNode(md,nametable,(MethodInvokeNode)en,td);
369 checkNameNode(md,nametable,(NameNode)en,td);
373 checkOpNode(md,nametable,(OpNode)en,td);
376 case Kind.OffsetNode:
377 checkOffsetNode(md, nametable, (OffsetNode)en, new TypeDescriptor(TypeDescriptor.OFFSET));
383 void checkCastNode(Descriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
384 /* Get type descriptor */
385 if (cn.getType()==null) {
386 NameDescriptor typenamed=cn.getTypeName().getName();
387 String typename=typenamed.toString();
388 TypeDescriptor ntd=new TypeDescriptor(typeutil.getClass(typename));
392 /* Check the type descriptor */
393 TypeDescriptor cast_type=cn.getType();
394 checkTypeDescriptor(cast_type);
398 if (!typeutil.isSuperorType(td,cast_type))
399 throw new Error("Cast node returns "+cast_type+", but need "+td);
402 ExpressionNode en=cn.getExpression();
403 checkExpressionNode(md, nametable, en, null);
404 TypeDescriptor etd=en.getType();
405 if (typeutil.isSuperorType(cast_type,etd)) /* Cast trivially succeeds */
408 if (typeutil.isSuperorType(etd,cast_type)) /* Cast may succeed */
410 if (typeutil.isCastable(etd, cast_type))
413 /* Different branches */
414 /* TODO: change if add interfaces */
415 throw new Error("Cast will always fail\n"+cn.printNode(0));
418 void checkFieldAccessNode(Descriptor md, SymbolTable nametable, FieldAccessNode fan, TypeDescriptor td) {
419 ExpressionNode left=fan.getExpression();
420 checkExpressionNode(md,nametable,left,null);
421 TypeDescriptor ltd=left.getType();
422 String fieldname=fan.getFieldName();
424 FieldDescriptor fd=null;
425 if (ltd.isArray()&&fieldname.equals("length"))
426 fd=FieldDescriptor.arrayLength;
428 fd=(FieldDescriptor) ltd.getClassDesc().getFieldTable().get(fieldname);
430 throw new Error("Unknown field "+fieldname + " in "+fan.printNode(0)+" in "+md);
433 if (!typeutil.isSuperorType(td,fan.getType()))
434 throw new Error("Field node returns "+fan.getType()+", but need "+td);
437 void checkArrayAccessNode(Descriptor md, SymbolTable nametable, ArrayAccessNode aan, TypeDescriptor td) {
438 ExpressionNode left=aan.getExpression();
439 checkExpressionNode(md,nametable,left,null);
441 checkExpressionNode(md,nametable,aan.getIndex(),new TypeDescriptor(TypeDescriptor.INT));
442 TypeDescriptor ltd=left.getType();
445 if (!typeutil.isSuperorType(td,aan.getType()))
446 throw new Error("Field node returns "+aan.getType()+", but need "+td);
449 void checkLiteralNode(Descriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
450 /* Resolve the type */
451 Object o=ln.getValue();
452 if (ln.getTypeString().equals("null")) {
453 ln.setType(new TypeDescriptor(TypeDescriptor.NULL));
454 } else if (o instanceof Integer) {
455 ln.setType(new TypeDescriptor(TypeDescriptor.INT));
456 } else if (o instanceof Long) {
457 ln.setType(new TypeDescriptor(TypeDescriptor.LONG));
458 } else if (o instanceof Float) {
459 ln.setType(new TypeDescriptor(TypeDescriptor.FLOAT));
460 } else if (o instanceof Boolean) {
461 ln.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
462 } else if (o instanceof Double) {
463 ln.setType(new TypeDescriptor(TypeDescriptor.DOUBLE));
464 } else if (o instanceof Character) {
465 ln.setType(new TypeDescriptor(TypeDescriptor.CHAR));
466 } else if (o instanceof String) {
467 ln.setType(new TypeDescriptor(typeutil.getClass(TypeUtil.StringClass)));
471 if (!typeutil.isSuperorType(td,ln.getType()))
472 throw new Error("Field node returns "+ln.getType()+", but need "+td);
475 void checkNameNode(Descriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
476 NameDescriptor nd=nn.getName();
477 if (nd.getBase()!=null) {
479 /* Rewrite NameNode */
480 ExpressionNode en=translateNameDescriptorintoExpression(nd);
481 nn.setExpression(en);
482 checkExpressionNode(md,nametable,en,td);
484 String varname=nd.toString();
485 Descriptor d=(Descriptor)nametable.get(varname);
487 throw new Error("Name "+varname+" undefined in: "+md);
489 if (d instanceof VarDescriptor) {
491 } else if (d instanceof FieldDescriptor) {
492 nn.setField((FieldDescriptor)d);
493 nn.setVar((VarDescriptor)nametable.get("this")); /* Need a pointer to this */
494 } else if (d instanceof TagVarDescriptor) {
496 } else throw new Error("Wrong type of descriptor");
498 if (!typeutil.isSuperorType(td,nn.getType()))
499 throw new Error("Field node returns "+nn.getType()+", but need "+td);
503 void checkOffsetNode(Descriptor md, SymbolTable nameTable, OffsetNode ofn, TypeDescriptor td) {
504 TypeDescriptor ltd = ofn.td;
505 //System.out.println("Testing TypeDescriptor ltd = " + ofn.td);
506 String fieldname = ofn.fieldname;
507 //System.out.println("Testing String fieldname = " + ofn.fieldname);
508 Descriptor d = (Descriptor) nameTable.get(fieldname);
509 //System.out.println("Testing Descriptor d = " + d.toString());
511 ClassDescriptor cd = null;
512 checkTypeDescriptor(ltd);
513 cd = ltd.getClassDesc();
514 ofn.setClassDesc(cd);
515 //System.out.println("Testing for ClassDescriptor cd = " + cd.toString());
517 FieldDescriptor fd=null;
518 if (ltd.isArray()&&fieldname.equals("length")) {
519 fd=FieldDescriptor.arrayLength;
521 fd=(FieldDescriptor) cd.getFieldTable().get(fieldname);
523 //System.out.println("Testing for FieldDescriptor fd = " + fd.toString());
526 throw new Error("Unknown field "+fieldname + " in "+ofn.printNode(1)+" in "+md);
530 void checkAssignmentNode(Descriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
531 boolean postinc=true;
532 if (an.getOperation().getBaseOp()==null||
533 (an.getOperation().getBaseOp().getOp()!=Operation.POSTINC&&
534 an.getOperation().getBaseOp().getOp()!=Operation.POSTDEC))
538 checkExpressionNode(md, nametable, an.getSrc(),td);
539 //TODO: Need check on validity of operation here
540 if (!((an.getDest() instanceof FieldAccessNode)||
541 (an.getDest() instanceof ArrayAccessNode)||
542 (an.getDest() instanceof NameNode)))
543 throw new Error("Bad lside in "+an.printNode(0));
544 checkExpressionNode(md, nametable, an.getDest(), null);
546 /* We want parameter variables to tasks to be immutable */
547 if (md instanceof TaskDescriptor) {
548 if (an.getDest() instanceof NameNode) {
549 NameNode nn=(NameNode)an.getDest();
550 if (nn.getVar()!=null) {
551 if (((TaskDescriptor)md).getParameterTable().contains(nn.getVar().getSymbol()))
552 throw new Error("Can't modify parameter "+nn.getVar()+ " to task "+td.getSymbol());
557 if (an.getDest().getType().isString()&&an.getOperation().getOp()==AssignOperation.PLUSEQ) {
559 ClassDescriptor stringcl=typeutil.getClass(TypeUtil.StringClass);
560 TypeDescriptor stringtd=new TypeDescriptor(stringcl);
561 NameDescriptor nd=new NameDescriptor("String");
562 NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
564 if (!(an.getSrc().getType().isString()&&(an.getSrc() instanceof OpNode))) {
565 MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
566 rightmin.addArgument(an.getSrc());
568 checkExpressionNode(md, nametable, an.getSrc(), null);
572 if (!postinc&&!typeutil.isSuperorType(an.getDest().getType(),an.getSrc().getType())) {
573 throw new Error("Type of rside ("+an.getSrc().getType()+") not compatible with type of lside ("+an.getDest().getType()+")"+an.printNode(0));
577 void checkLoopNode(Descriptor md, SymbolTable nametable, LoopNode ln) {
578 if (ln.getType()==LoopNode.WHILELOOP||ln.getType()==LoopNode.DOWHILELOOP) {
579 checkExpressionNode(md, nametable, ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
580 checkBlockNode(md, nametable, ln.getBody());
583 /* Link in the initializer naming environment */
584 BlockNode bn=ln.getInitializer();
585 bn.getVarTable().setParent(nametable);
586 for(int i=0; i<bn.size(); i++) {
587 BlockStatementNode bsn=bn.get(i);
588 checkBlockStatementNode(md, bn.getVarTable(),bsn);
590 //check the condition
591 checkExpressionNode(md, bn.getVarTable(), ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
592 checkBlockNode(md, bn.getVarTable(), ln.getBody());
593 checkBlockNode(md, bn.getVarTable(), ln.getUpdate());
598 void checkCreateObjectNode(Descriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
599 TypeDescriptor[] tdarray=new TypeDescriptor[con.numArgs()];
600 for(int i=0; i<con.numArgs(); i++) {
601 ExpressionNode en=con.getArg(i);
602 checkExpressionNode(md,nametable,en,null);
603 tdarray[i]=en.getType();
606 TypeDescriptor typetolookin=con.getType();
607 checkTypeDescriptor(typetolookin);
609 if (td!=null&&!typeutil.isSuperorType(td, typetolookin))
610 throw new Error(typetolookin + " isn't a "+td);
612 /* Check flag effects */
613 if (con.getFlagEffects()!=null) {
614 FlagEffects fe=con.getFlagEffects();
615 ClassDescriptor cd=typetolookin.getClassDesc();
617 for(int j=0; j<fe.numEffects(); j++) {
618 FlagEffect flag=fe.getEffect(j);
619 String name=flag.getName();
620 FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
621 //Make sure the flag is declared
623 throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
624 if (flag_d.getExternal())
625 throw new Error("Attempting to modify external flag: "+name);
626 flag.setFlag(flag_d);
628 for(int j=0; j<fe.numTagEffects(); j++) {
629 TagEffect tag=fe.getTagEffect(j);
630 String name=tag.getName();
632 Descriptor d=(Descriptor)nametable.get(name);
634 throw new Error("Tag descriptor "+name+" undeclared");
635 else if (!(d instanceof TagVarDescriptor))
636 throw new Error(name+" is not a tag descriptor");
637 tag.setTag((TagVarDescriptor)d);
641 if ((!typetolookin.isClass())&&(!typetolookin.isArray()))
642 throw new Error("Can't allocate primitive type:"+con.printNode(0));
644 if (!typetolookin.isArray()) {
645 //Array's don't need constructor calls
646 ClassDescriptor classtolookin=typetolookin.getClassDesc();
648 Set methoddescriptorset=classtolookin.getMethodTable().getSet(typetolookin.getSymbol());
649 MethodDescriptor bestmd=null;
651 for(Iterator methodit=methoddescriptorset.iterator(); methodit.hasNext();) {
652 MethodDescriptor currmd=(MethodDescriptor)methodit.next();
653 /* Need correct number of parameters */
654 if (con.numArgs()!=currmd.numParameters())
656 for(int i=0; i<con.numArgs(); i++) {
657 if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
660 /* Local allocations can't call global allocator */
661 if (!con.isGlobal()&&currmd.isGlobal())
664 /* Method okay so far */
668 if (typeutil.isMoreSpecific(currmd,bestmd)) {
670 } else if (con.isGlobal()&&match(currmd, bestmd)) {
671 if (currmd.isGlobal()&&!bestmd.isGlobal())
673 else if (currmd.isGlobal()&&bestmd.isGlobal())
675 } else if (!typeutil.isMoreSpecific(bestmd, currmd)) {
676 throw new Error("No method is most specific");
679 /* Is this more specific than bestmd */
683 throw new Error("No method found for "+con.printNode(0)+" in "+md);
684 con.setConstructor(bestmd);
689 /** Check to see if md1 is the same specificity as md2.*/
691 boolean match(MethodDescriptor md1, MethodDescriptor md2) {
692 /* Checks if md1 is more specific than md2 */
693 if (md1.numParameters()!=md2.numParameters())
695 for(int i=0; i<md1.numParameters(); i++) {
696 if (!md2.getParamType(i).equals(md1.getParamType(i)))
699 if (!md2.getReturnType().equals(md1.getReturnType()))
702 if (!md2.getClassDesc().equals(md1.getClassDesc()))
710 ExpressionNode translateNameDescriptorintoExpression(NameDescriptor nd) {
711 String id=nd.getIdentifier();
712 NameDescriptor base=nd.getBase();
714 return new NameNode(nd);
716 return new FieldAccessNode(translateNameDescriptorintoExpression(base),id);
720 void checkMethodInvokeNode(Descriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
721 /*Typecheck subexpressions
722 and get types for expressions*/
724 TypeDescriptor[] tdarray=new TypeDescriptor[min.numArgs()];
725 for(int i=0; i<min.numArgs(); i++) {
726 ExpressionNode en=min.getArg(i);
727 checkExpressionNode(md,nametable,en,null);
728 tdarray[i]=en.getType();
730 TypeDescriptor typetolookin=null;
731 if (min.getExpression()!=null) {
732 checkExpressionNode(md,nametable,min.getExpression(),null);
733 typetolookin=min.getExpression().getType();
734 } else if (min.getBaseName()!=null) {
735 String rootname=min.getBaseName().getRoot();
736 if (rootname.equals("super")) {
737 ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
738 typetolookin=new TypeDescriptor(supercd);
739 } else if (nametable.get(rootname)!=null) {
740 //we have an expression
741 min.setExpression(translateNameDescriptorintoExpression(min.getBaseName()));
742 checkExpressionNode(md, nametable, min.getExpression(), null);
743 typetolookin=min.getExpression().getType();
746 ClassDescriptor cd=typeutil.getClass(min.getBaseName().getSymbol());
748 throw new Error("md = "+ md.toString()+ " "+min.getBaseName()+" undefined");
749 typetolookin=new TypeDescriptor(cd);
751 } else if ((md instanceof MethodDescriptor)&&min.getMethodName().equals("super")) {
752 ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
753 min.methodid=supercd.getSymbol();
754 typetolookin=new TypeDescriptor(supercd);
755 } else if (md instanceof MethodDescriptor) {
756 typetolookin=new TypeDescriptor(((MethodDescriptor)md).getClassDesc());
758 /* If this a task descriptor we throw an error at this point */
759 throw new Error("Unknown method call to "+min.getMethodName()+"in task"+md.getSymbol());
761 if (!typetolookin.isClass())
762 throw new Error("Error with method call to "+min.getMethodName());
763 ClassDescriptor classtolookin=typetolookin.getClassDesc();
764 //System.out.println("Method name="+min.getMethodName());
766 Set methoddescriptorset=classtolookin.getMethodTable().getSet(min.getMethodName());
767 MethodDescriptor bestmd=null;
769 for(Iterator methodit=methoddescriptorset.iterator(); methodit.hasNext();) {
770 MethodDescriptor currmd=(MethodDescriptor)methodit.next();
771 /* Need correct number of parameters */
772 if (min.numArgs()!=currmd.numParameters())
774 for(int i=0; i<min.numArgs(); i++) {
775 if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
778 /* Method okay so far */
782 if (typeutil.isMoreSpecific(currmd,bestmd)) {
784 } else if (!typeutil.isMoreSpecific(bestmd, currmd))
785 throw new Error("No method is most specific");
787 /* Is this more specific than bestmd */
791 throw new Error("No method found for :"+min.printNode(0)+" in class: " + classtolookin+" in "+md);
792 min.setMethod(bestmd);
794 if ((td!=null)&&(min.getType()!=null)&&!typeutil.isSuperorType(td, min.getType()))
795 throw new Error(min.getType()+ " is not equal to or a subclass of "+td);
796 /* Check whether we need to set this parameter to implied this */
797 if (!bestmd.isStatic()) {
798 if (min.getExpression()==null) {
799 ExpressionNode en=new NameNode(new NameDescriptor("this"));
800 min.setExpression(en);
801 checkExpressionNode(md, nametable, min.getExpression(), null);
807 void checkOpNode(Descriptor md, SymbolTable nametable, OpNode on, TypeDescriptor td) {
808 checkExpressionNode(md, nametable, on.getLeft(), null);
809 if (on.getRight()!=null)
810 checkExpressionNode(md, nametable, on.getRight(), null);
811 TypeDescriptor ltd=on.getLeft().getType();
812 TypeDescriptor rtd=on.getRight()!=null ? on.getRight().getType() : null;
813 TypeDescriptor lefttype=null;
814 TypeDescriptor righttype=null;
815 Operation op=on.getOp();
818 case Operation.LOGIC_OR:
819 case Operation.LOGIC_AND:
820 if (!(rtd.isBoolean()))
822 on.setRightType(rtd);
824 case Operation.LOGIC_NOT:
825 if (!(ltd.isBoolean()))
830 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
834 // 5.6.2 Binary Numeric Promotion
835 //TODO unboxing of reference objects
838 else if (ltd.isFloat())
840 else if (ltd.isLong())
841 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
843 lefttype=new TypeDescriptor(TypeDescriptor.INT);
844 on.setLeftType(lefttype);
845 on.setType(lefttype);
848 case Operation.BIT_OR:
849 case Operation.BIT_XOR:
850 case Operation.BIT_AND:
851 // 5.6.2 Binary Numeric Promotion
852 //TODO unboxing of reference objects
853 if (ltd.isDouble()||rtd.isDouble())
855 else if (ltd.isFloat()||rtd.isFloat())
857 else if (ltd.isLong()||rtd.isLong())
858 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
860 lefttype=new TypeDescriptor(TypeDescriptor.INT);
863 on.setLeftType(lefttype);
864 on.setRightType(righttype);
865 on.setType(lefttype);
868 case Operation.ISAVAILABLE:
869 if (!(ltd.isPtr())) {
870 throw new Error("Can't use isavailable on non-pointers/non-parameters.");
873 on.setLeftType(lefttype);
874 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
877 case Operation.EQUAL:
878 case Operation.NOTEQUAL:
879 // 5.6.2 Binary Numeric Promotion
880 //TODO unboxing of reference objects
881 if (ltd.isBoolean()||rtd.isBoolean()) {
882 if (!(ltd.isBoolean()&&rtd.isBoolean()))
884 righttype=lefttype=new TypeDescriptor(TypeDescriptor.BOOLEAN);
885 } else if (ltd.isPtr()||rtd.isPtr()) {
886 if (!(ltd.isPtr()&&rtd.isPtr()))
890 } else if (ltd.isDouble()||rtd.isDouble())
891 righttype=lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
892 else if (ltd.isFloat()||rtd.isFloat())
893 righttype=lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
894 else if (ltd.isLong()||rtd.isLong())
895 righttype=lefttype=new TypeDescriptor(TypeDescriptor.LONG);
897 righttype=lefttype=new TypeDescriptor(TypeDescriptor.INT);
899 on.setLeftType(lefttype);
900 on.setRightType(righttype);
901 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
910 // 5.6.2 Binary Numeric Promotion
911 //TODO unboxing of reference objects
912 if (!ltd.isNumber()||!rtd.isNumber())
915 if (ltd.isDouble()||rtd.isDouble())
916 lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
917 else if (ltd.isFloat()||rtd.isFloat())
918 lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
919 else if (ltd.isLong()||rtd.isLong())
920 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
922 lefttype=new TypeDescriptor(TypeDescriptor.INT);
924 on.setLeftType(lefttype);
925 on.setRightType(righttype);
926 on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
930 if (ltd.isString()||rtd.isString()) {
931 ClassDescriptor stringcl=typeutil.getClass(TypeUtil.StringClass);
932 TypeDescriptor stringtd=new TypeDescriptor(stringcl);
933 NameDescriptor nd=new NameDescriptor("String");
934 NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
935 if (!(ltd.isString()&&(on.getLeft() instanceof OpNode))) {
936 MethodInvokeNode leftmin=new MethodInvokeNode(valuend);
937 leftmin.addArgument(on.getLeft());
939 checkExpressionNode(md, nametable, on.getLeft(), null);
942 if (!(rtd.isString()&&(on.getRight() instanceof OpNode))) {
943 MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
944 rightmin.addArgument(on.getRight());
946 checkExpressionNode(md, nametable, on.getRight(), null);
949 on.setLeftType(stringtd);
950 on.setRightType(stringtd);
951 on.setType(stringtd);
959 // 5.6.2 Binary Numeric Promotion
960 //TODO unboxing of reference objects
961 if (ltd.isArray()||rtd.isArray()||!ltd.isNumber()||!rtd.isNumber())
962 throw new Error("Error in "+on.printNode(0));
964 if (ltd.isDouble()||rtd.isDouble())
965 lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
966 else if (ltd.isFloat()||rtd.isFloat())
967 lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
968 else if (ltd.isLong()||rtd.isLong())
969 lefttype=new TypeDescriptor(TypeDescriptor.LONG);
971 lefttype=new TypeDescriptor(TypeDescriptor.INT);
973 on.setLeftType(lefttype);
974 on.setRightType(righttype);
975 on.setType(lefttype);
978 case Operation.LEFTSHIFT:
979 case Operation.RIGHTSHIFT:
980 case Operation.URIGHTSHIFT:
981 if (!rtd.isIntegerType())
983 //5.6.1 Unary Numeric Promotion
984 if (rtd.isByte()||rtd.isShort()||rtd.isInt())
985 righttype=new TypeDescriptor(TypeDescriptor.INT);
989 on.setRightType(righttype);
990 if (!ltd.isIntegerType())
993 case Operation.UNARYPLUS:
994 case Operation.UNARYMINUS:
995 /* case Operation.POSTINC:
996 case Operation.POSTDEC:
997 case Operation.PREINC:
998 case Operation.PREDEC:*/
1001 //5.6.1 Unary Numeric Promotion
1002 if (ltd.isByte()||ltd.isShort()||ltd.isInt())
1003 lefttype=new TypeDescriptor(TypeDescriptor.INT);
1006 on.setLeftType(lefttype);
1007 on.setType(lefttype);
1011 throw new Error(op.toString());
1015 if (!typeutil.isSuperorType(td, on.getType())) {
1016 System.out.println(td);
1017 System.out.println(on.getType());
1018 throw new Error("Type of rside not compatible with type of lside"+on.printNode(0));