// Do descriptors first
while(it.hasNext()) {
ClassDescriptor cd=(ClassDescriptor)it.next();
- System.out.println("Checking class: "+cd);
+ //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
+ // Link together Field, Method, and Flag tables so classes
+ // inherit these from their superclasses
cd.getFieldTable().setParent(cd.getSuperDesc().getFieldTable());
cd.getMethodTable().setParent(cd.getSuperDesc().getMethodTable());
+ cd.getFlagTable().setParent(cd.getSuperDesc().getFlagTable());
}
+ /* Check to see that fields are well typed */
for(Iterator field_it=cd.getFields();field_it.hasNext();) {
FieldDescriptor fd=(FieldDescriptor)field_it.next();
- System.out.println("Checking field: "+fd);
+ //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);
checkMethodBody(cd,md);
}
}
+
+ for(Iterator task_it=state.getTaskSymbolTable().getDescriptorsIterator();task_it.hasNext();) {
+ TaskDescriptor td=(TaskDescriptor)task_it.next();
+ checkTask(td);
+
+ }
+
}
public void checkTypeDescriptor(TypeDescriptor td) {
if (td.isPrimitive())
return; /* Done */
- if (td.isClass()) {
+ else 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();
+ } else if (td.isTag())
+ return;
+ else
+ throw new Error();
}
public void checkField(ClassDescriptor cd, FieldDescriptor fd) {
checkTypeDescriptor(fd.getType());
}
+ public void checkConstraintCheck(TaskDescriptor td, SymbolTable nametable, Vector ccs) {
+ if (ccs==null)
+ return; /* No constraint checks to check */
+ for(int i=0;i<ccs.size();i++) {
+ ConstraintCheck cc=(ConstraintCheck) ccs.get(i);
+
+ for(int j=0;j<cc.numArgs();j++) {
+ ExpressionNode en=cc.getArg(j);
+ checkExpressionNode(td,nametable,en,null);
+ }
+ }
+ }
+
+ public void checkFlagEffects(TaskDescriptor td, Vector vfe, SymbolTable nametable) {
+ if (vfe==null)
+ return; /* No flag effects to check */
+ for(int i=0;i<vfe.size();i++) {
+ FlagEffects fe=(FlagEffects) vfe.get(i);
+ String varname=fe.getName();
+ //Make sure the variable is declared as a parameter to the task
+ VarDescriptor vd=(VarDescriptor)td.getParameterTable().get(varname);
+ if (vd==null)
+ throw new Error("Parameter "+varname+" in Flag Effects not declared");
+ fe.setVar(vd);
+
+ //Make sure it correspods to a class
+ TypeDescriptor type_d=vd.getType();
+ if (!type_d.isClass())
+ throw new Error("Cannot have non-object argument for flag_effect");
+
+ ClassDescriptor cd=type_d.getClassDesc();
+ for(int j=0;j<fe.numEffects();j++) {
+ FlagEffect flag=fe.getEffect(j);
+ String name=flag.getName();
+ FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
+ //Make sure the flag is declared
+ if (flag_d==null)
+ throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
+ if (flag_d.getExternal())
+ throw new Error("Attempting to modify external flag: "+name);
+ flag.setFlag(flag_d);
+ }
+ for(int j=0;j<fe.numTagEffects();j++) {
+ TagEffect tag=fe.getTagEffect(j);
+ String name=tag.getName();
+
+ Descriptor d=(Descriptor)nametable.get(name);
+ if (d==null)
+ throw new Error("Tag descriptor "+name+" undeclared");
+ else if (!(d instanceof TagVarDescriptor))
+ throw new Error(name+" is not a tag descriptor");
+ tag.setTag((TagVarDescriptor)d);
+ }
+ }
+ }
+
+ public void checkTask(TaskDescriptor td) {
+ for(int i=0;i<td.numParameters();i++) {
+ /* Check that parameter is well typed */
+ TypeDescriptor param_type=td.getParamType(i);
+ checkTypeDescriptor(param_type);
+
+ /* Check the parameter's flag expression is well formed */
+ FlagExpressionNode fen=td.getFlag(td.getParameter(i));
+ if (!param_type.isClass())
+ throw new Error("Cannot have non-object argument to a task");
+ ClassDescriptor cd=param_type.getClassDesc();
+ if (fen!=null)
+ checkFlagExpressionNode(cd, fen);
+ }
+
+ checkFlagEffects(td, td.getFlagEffects(),td.getParameterTable());
+ /* Check that the task code is valid */
+ BlockNode bn=state.getMethodBody(td);
+ checkBlockNode(td, td.getParameterTable(),bn);
+ }
+
+ public void checkFlagExpressionNode(ClassDescriptor cd, FlagExpressionNode fen) {
+ switch(fen.kind()) {
+ case Kind.FlagOpNode:
+ {
+ FlagOpNode fon=(FlagOpNode)fen;
+ checkFlagExpressionNode(cd, fon.getLeft());
+ if (fon.getRight()!=null)
+ checkFlagExpressionNode(cd, fon.getRight());
+ break;
+ }
+ case Kind.FlagNode:
+ {
+ FlagNode fn=(FlagNode)fen;
+ String name=fn.getFlagName();
+ FlagDescriptor fd=(FlagDescriptor)cd.getFlagTable().get(name);
+ if (fd==null)
+ throw new Error("Undeclared flag: "+name);
+ fn.setFlag(fd);
+ break;
+ }
+ default:
+ throw new Error("Unrecognized FlagExpressionNode");
+ }
+ }
+
public void checkMethod(ClassDescriptor cd, MethodDescriptor md) {
/* Check return type */
- if (!md.getReturnType().isVoid())
- checkTypeDescriptor(md.getReturnType());
+ if (!md.isConstructor())
+ 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());
+ if (!md.isStatic()) /* Fields aren't accessible directly in a static method, so don't link in this table */
+ md.getParameterTable().setParent(cd.getFieldTable());
+ md.setClassDesc(cd);
+ if (!md.isStatic()) {
+ VarDescriptor thisvd=new VarDescriptor(new TypeDescriptor(cd),"this");
+ md.setThis(thisvd);
+ }
}
public void checkMethodBody(ClassDescriptor cd, MethodDescriptor md) {
+ //System.out.println("Processing method:"+md);
BlockNode bn=state.getMethodBody(md);
checkBlockNode(md, md.getParameterTable(),bn);
}
- public void checkBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn) {
+ public void checkBlockNode(Descriptor md, SymbolTable nametable, BlockNode bn) {
/* Link in the naming environment */
bn.getVarTable().setParent(nametable);
for(int i=0;i<bn.size();i++) {
}
}
- public void checkBlockStatementNode(MethodDescriptor md, SymbolTable nametable, BlockStatementNode bsn) {
+ public void checkBlockStatementNode(Descriptor md, SymbolTable nametable, BlockStatementNode bsn) {
switch(bsn.kind()) {
case Kind.BlockExpressionNode:
checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
case Kind.DeclarationNode:
checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
return;
+
+ case Kind.TagDeclarationNode:
+ checkTagDeclarationNode(md, nametable, (TagDeclarationNode)bsn);
+ return;
case Kind.IfStatementNode:
checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
checkReturnNode(md, nametable, (ReturnNode)bsn);
return;
+ case Kind.TaskExitNode:
+ checkTaskExitNode(md, nametable, (TaskExitNode)bsn);
+ return;
+
case Kind.SubBlockNode:
checkSubBlockNode(md, nametable, (SubBlockNode)bsn);
return;
+
+ case Kind.AtomicNode:
+ checkAtomicNode(md, nametable, (AtomicNode)bsn);
+ return;
}
throw new Error();
}
- void checkBlockExpressionNode(MethodDescriptor md, SymbolTable nametable, BlockExpressionNode ben) {
+ void checkBlockExpressionNode(Descriptor md, SymbolTable nametable, BlockExpressionNode ben) {
checkExpressionNode(md, nametable, ben.getExpression(), null);
}
- void checkDeclarationNode(MethodDescriptor md, SymbolTable nametable, DeclarationNode dn) {
+ void checkDeclarationNode(Descriptor md, SymbolTable nametable, DeclarationNode dn) {
VarDescriptor vd=dn.getVarDescriptor();
checkTypeDescriptor(vd.getType());
Descriptor d=nametable.get(vd.getSymbol());
if (dn.getExpression()!=null)
checkExpressionNode(md, nametable, dn.getExpression(), vd.getType());
}
+
+ void checkTagDeclarationNode(Descriptor md, SymbolTable nametable, TagDeclarationNode dn) {
+ TagVarDescriptor vd=dn.getTagVarDescriptor();
+ 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");
+ }
- void checkSubBlockNode(MethodDescriptor md, SymbolTable nametable, SubBlockNode sbn) {
+ void checkSubBlockNode(Descriptor 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 checkAtomicNode(Descriptor md, SymbolTable nametable, AtomicNode sbn) {
+ checkBlockNode(md, nametable, sbn.getBlockNode());
}
- void checkIfStatementNode(MethodDescriptor md, SymbolTable nametable, IfStatementNode isn) {
+ void checkReturnNode(Descriptor d, SymbolTable nametable, ReturnNode rn) {
+ if (d instanceof TaskDescriptor)
+ throw new Error("Illegal return appears in Task: "+d.getSymbol());
+ MethodDescriptor md=(MethodDescriptor)d;
+ if (rn.getReturnExpression()!=null)
+ if (md.getReturnType()==null)
+ throw new Error("Constructor can't return something.");
+ else if (md.getReturnType().isVoid())
+ throw new Error(md+" is void");
+ else
+ checkExpressionNode(md, nametable, rn.getReturnExpression(), md.getReturnType());
+ else
+ if (md.getReturnType()!=null&&!md.getReturnType().isVoid())
+ throw new Error("Need to return something for "+md);
+ }
+
+ void checkTaskExitNode(Descriptor md, SymbolTable nametable, TaskExitNode ten) {
+ if (md instanceof MethodDescriptor)
+ throw new Error("Illegal taskexit appears in Method: "+md.getSymbol());
+ checkFlagEffects((TaskDescriptor)md, ten.getFlagEffects(),nametable);
+ checkConstraintCheck((TaskDescriptor) md, nametable, ten.getChecks());
+ }
+
+ void checkIfStatementNode(Descriptor md, SymbolTable nametable, IfStatementNode isn) {
checkExpressionNode(md, nametable, isn.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
checkBlockNode(md, nametable, isn.getTrueBlock());
- checkBlockNode(md, nametable, isn.getFalseBlock());
+ if (isn.getFalseBlock()!=null)
+ checkBlockNode(md, nametable, isn.getFalseBlock());
}
- void checkExpressionNode(MethodDescriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
+ void checkExpressionNode(Descriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
switch(en.kind()) {
case Kind.AssignmentNode:
checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
case Kind.FieldAccessNode:
checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
return;
+ case Kind.ArrayAccessNode:
+ checkArrayAccessNode(md,nametable,(ArrayAccessNode)en,td);
+ return;
case Kind.LiteralNode:
checkLiteralNode(md,nametable,(LiteralNode)en,td);
return;
throw new Error();
}
- void checkCastNode(MethodDescriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
+ void checkCastNode(Descriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
/* Get type descriptor */
if (cn.getType()==null) {
NameDescriptor typenamed=cn.getTypeName().getName();
if (typeutil.isSuperorType(etd,cast_type)) /* Cast may succeed */
return;
-
+ if (typeutil.isCastable(etd, cast_type))
+ 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) {
+ void checkFieldAccessNode(Descriptor 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);
+
+ FieldDescriptor fd=null;
+ if (ltd.isArray()&&fieldname.equals("length"))
+ fd=FieldDescriptor.arrayLength;
+ else
+ fd=(FieldDescriptor) ltd.getClassDesc().getFieldTable().get(fieldname);
if (fd==null)
- throw new Error("Unknown field "+fieldname);
+ throw new Error("Unknown field "+fieldname + " in "+fan.printNode(0));
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) {
+ void checkArrayAccessNode(Descriptor md, SymbolTable nametable, ArrayAccessNode aan, TypeDescriptor td) {
+ ExpressionNode left=aan.getExpression();
+ checkExpressionNode(md,nametable,left,null);
+
+ checkExpressionNode(md,nametable,aan.getIndex(),new TypeDescriptor(TypeDescriptor.INT));
+ TypeDescriptor ltd=left.getType();
+
+ if (td!=null)
+ if (!typeutil.isSuperorType(td,aan.getType()))
+ throw new Error("Field node returns "+aan.getType()+", but need "+td);
+ }
+
+ void checkLiteralNode(Descriptor md, SymbolTable nametable, LiteralNode ln, TypeDescriptor td) {
/* Resolve the type */
Object o=ln.getValue();
if (ln.getTypeString().equals("null")) {
ln.setType(new TypeDescriptor(TypeDescriptor.LONG));
} else if (o instanceof Float) {
ln.setType(new TypeDescriptor(TypeDescriptor.FLOAT));
+ } else if (o instanceof Boolean) {
+ ln.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
} 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) {
+ void checkNameNode(Descriptor 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");
+ if (nd.getBase()!=null) {
+ /* Big hack */
+ /* Rewrite NameNode */
+ ExpressionNode en=translateNameDescriptorintoExpression(nd);
+ nn.setExpression(en);
+ checkExpressionNode(md,nametable,en,td);
+ } else {
+ String varname=nd.toString();
+ Descriptor d=(Descriptor)nametable.get(varname);
+ if (d==null) {
+ throw new Error("Name "+varname+" undefined");
+ }
+ if (d instanceof VarDescriptor) {
+ nn.setVar(d);
+ } else if (d instanceof FieldDescriptor) {
+ nn.setField((FieldDescriptor)d);
+ nn.setVar((VarDescriptor)nametable.get("this")); /* Need a pointer to this */
+ } else if (d instanceof TagVarDescriptor) {
+ nn.setVar(d);
+ } else throw new Error("Wrong type of descriptor");
+ if (td!=null)
+ if (!typeutil.isSuperorType(td,nn.getType()))
+ throw new Error("Field node returns "+nn.getType()+", but need "+td);
}
- 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);
+ void checkAssignmentNode(Descriptor md, SymbolTable nametable, AssignmentNode an, TypeDescriptor td) {
+ boolean postinc=true;
+ if (an.getOperation().getBaseOp()==null||
+ (an.getOperation().getBaseOp().getOp()!=Operation.POSTINC&&
+ an.getOperation().getBaseOp().getOp()!=Operation.POSTDEC))
+ postinc=false;
+
+ if (!postinc)
+ checkExpressionNode(md, nametable, an.getSrc() ,td);
//TODO: Need check on validity of operation here
if (!((an.getDest() instanceof FieldAccessNode)||
+ (an.getDest() instanceof ArrayAccessNode)||
(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));
+
+ /* We want parameter variables to tasks to be immutable */
+ if (md instanceof TaskDescriptor) {
+ if (an.getDest() instanceof NameNode) {
+ NameNode nn=(NameNode)an.getDest();
+ if (nn.getVar()!=null) {
+ if (((TaskDescriptor)md).getParameterTable().contains(nn.getVar().getSymbol()))
+ throw new Error("Can't modify parameter "+nn.getVar()+ " to task "+td.getSymbol());
+ }
+ }
+ }
+
+ if (!postinc&&!typeutil.isSuperorType(an.getDest().getType(),an.getSrc().getType())) {
+ throw new Error("Type of rside ("+an.getSrc().getType()+") not compatible with type of lside ("+an.getDest().getType()+")"+an.printNode(0));
+ }
}
- void checkLoopNode(MethodDescriptor md, SymbolTable nametable, LoopNode ln) {
+ void checkLoopNode(Descriptor 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());
}
- void checkCreateObjectNode(MethodDescriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
-
+ void checkCreateObjectNode(Descriptor md, SymbolTable nametable, CreateObjectNode con, TypeDescriptor td) {
+ TypeDescriptor[] tdarray=new TypeDescriptor[con.numArgs()];
+ for(int i=0;i<con.numArgs();i++) {
+ ExpressionNode en=con.getArg(i);
+ checkExpressionNode(md,nametable,en,null);
+ tdarray[i]=en.getType();
+ }
+
+ TypeDescriptor typetolookin=con.getType();
+ checkTypeDescriptor(typetolookin);
+
+ if (td!=null&&!typeutil.isSuperorType(td, typetolookin))
+ throw new Error(typetolookin + " isn't a "+td);
+
+
+
+ /* Check flag effects */
+ if (con.getFlagEffects()!=null) {
+ FlagEffects fe=con.getFlagEffects();
+ ClassDescriptor cd=typetolookin.getClassDesc();
+
+ for(int j=0;j<fe.numEffects();j++) {
+ FlagEffect flag=fe.getEffect(j);
+ String name=flag.getName();
+ FlagDescriptor flag_d=(FlagDescriptor)cd.getFlagTable().get(name);
+ //Make sure the flag is declared
+ if (flag_d==null)
+ throw new Error("Flag descriptor "+name+" undefined in class: "+cd.getSymbol());
+ if (flag_d.getExternal())
+ throw new Error("Attempting to modify external flag: "+name);
+ flag.setFlag(flag_d);
+ }
+ for(int j=0;j<fe.numTagEffects();j++) {
+ TagEffect tag=fe.getTagEffect(j);
+ String name=tag.getName();
+
+ Descriptor d=(Descriptor)nametable.get(name);
+ if (d==null)
+ throw new Error("Tag descriptor "+name+" undeclared");
+ else if (!(d instanceof TagVarDescriptor))
+ throw new Error(name+" is not a tag descriptor");
+ tag.setTag((TagVarDescriptor)d);
+ }
+ }
+
+
+ if ((!typetolookin.isClass())&&(!typetolookin.isArray()))
+ throw new Error("Can't allocate primitive type:"+con.printNode(0));
+
+ if (!typetolookin.isArray()) {
+ //Array's don't need constructor calls
+ ClassDescriptor classtolookin=typetolookin.getClassDesc();
+ //System.out.println("Looking for "+typetolookin.getSymbol());
+ //System.out.println(classtolookin.getMethodTable());
+
+ Set methoddescriptorset=classtolookin.getMethodTable().getSet(typetolookin.getSymbol());
+ MethodDescriptor bestmd=null;
+ NextMethod:
+ for(Iterator methodit=methoddescriptorset.iterator();methodit.hasNext();) {
+ MethodDescriptor currmd=(MethodDescriptor)methodit.next();
+ /* Need correct number of parameters */
+ //System.out.println("Examining: "+currmd);
+ if (con.numArgs()!=currmd.numParameters())
+ continue;
+ for(int i=0;i<con.numArgs();i++) {
+ if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
+ continue NextMethod;
+ }
+ /* Method okay so far */
+ if (bestmd==null)
+ bestmd=currmd;
+ else {
+ if (isMoreSpecific(currmd,bestmd)) {
+ bestmd=currmd;
+ } else if (!isMoreSpecific(bestmd, currmd))
+ throw new Error("No method is most specific");
+
+ /* Is this more specific than bestmd */
+ }
+ }
+ if (bestmd==null)
+ throw new Error("No method found for "+con.printNode(0));
+ con.setConstructor(bestmd);
+ }
}
- void checkMethodInvokeNode(MethodDescriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
+ /** Check to see if md1 is more specific than md2... Informally
+ if md2 could always be called given the arguments passed into
+ md1 */
+
+ boolean isMoreSpecific(MethodDescriptor md1, MethodDescriptor md2) {
+ /* Checks if md1 is more specific than md2 */
+ if (md1.numParameters()!=md2.numParameters())
+ throw new Error();
+ for(int i=0;i<md1.numParameters();i++) {
+ if (!typeutil.isSuperorType(md2.getParamType(i), md1.getParamType(i)))
+ return false;
+ }
+ if (!typeutil.isSuperorType(md2.getReturnType(), md1.getReturnType()))
+ return false;
+
+ if (!typeutil.isSuperorType(md2.getClassDesc(), md1.getClassDesc()))
+ return false;
+
+ return true;
+ }
+ ExpressionNode translateNameDescriptorintoExpression(NameDescriptor nd) {
+ String id=nd.getIdentifier();
+ NameDescriptor base=nd.getBase();
+ if (base==null)
+ return new NameNode(nd);
+ else
+ return new FieldAccessNode(translateNameDescriptorintoExpression(base),id);
}
- void checkOpNode(MethodDescriptor md, SymbolTable nametable, OpNode on,TypeDescriptor td) {
+ void checkMethodInvokeNode(Descriptor md, SymbolTable nametable, MethodInvokeNode min, TypeDescriptor td) {
+ /*Typecheck subexpressions
+ and get types for expressions*/
+
+ TypeDescriptor[] tdarray=new TypeDescriptor[min.numArgs()];
+ for(int i=0;i<min.numArgs();i++) {
+ ExpressionNode en=min.getArg(i);
+ checkExpressionNode(md,nametable,en,null);
+ tdarray[i]=en.getType();
+ }
+ TypeDescriptor typetolookin=null;
+ if (min.getExpression()!=null) {
+ checkExpressionNode(md,nametable,min.getExpression(),null);
+ typetolookin=min.getExpression().getType();
+ } else if (min.getBaseName()!=null) {
+ String rootname=min.getBaseName().getRoot();
+ if (nametable.get(rootname)!=null) {
+ //we have an expression
+ min.setExpression(translateNameDescriptorintoExpression(min.getBaseName()));
+ checkExpressionNode(md, nametable, min.getExpression(), null);
+ typetolookin=min.getExpression().getType();
+ } else {
+ //we have a type
+ ClassDescriptor cd=typeutil.getClass(min.getBaseName().getSymbol());
+ if (cd==null)
+ throw new Error(min.getBaseName()+" undefined");
+ typetolookin=new TypeDescriptor(cd);
+ }
+ } else if (md instanceof MethodDescriptor) {
+ typetolookin=new TypeDescriptor(((MethodDescriptor)md).getClassDesc());
+ } else {
+ /* If this a task descriptor we throw an error at this point */
+ throw new Error("Unknown method call to "+min.getMethodName()+"in task"+md.getSymbol());
+ }
+ if (!typetolookin.isClass())
+ throw new Error("Error with method call to "+min.getMethodName());
+ ClassDescriptor classtolookin=typetolookin.getClassDesc();
+ //System.out.println("Method name="+min.getMethodName());
+
+ Set methoddescriptorset=classtolookin.getMethodTable().getSet(min.getMethodName());
+ MethodDescriptor bestmd=null;
+ NextMethod:
+ for(Iterator methodit=methoddescriptorset.iterator();methodit.hasNext();) {
+ MethodDescriptor currmd=(MethodDescriptor)methodit.next();
+ /* Need correct number of parameters */
+ if (min.numArgs()!=currmd.numParameters())
+ continue;
+ for(int i=0;i<min.numArgs();i++) {
+ if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
+ continue NextMethod;
+ }
+ /* Method okay so far */
+ if (bestmd==null)
+ bestmd=currmd;
+ else {
+ if (isMoreSpecific(currmd,bestmd)) {
+ bestmd=currmd;
+ } else if (!isMoreSpecific(bestmd, currmd))
+ throw new Error("No method is most specific");
+
+ /* Is this more specific than bestmd */
+ }
+ }
+ if (bestmd==null)
+ throw new Error("No method found for :"+min.printNode(0));
+ min.setMethod(bestmd);
+
+ if ((td!=null)&&(min.getType()!=null)&&!typeutil.isSuperorType(td, min.getType()))
+ throw new Error(min.getType()+ " is not equal to or a subclass of "+td);
+ /* Check whether we need to set this parameter to implied this */
+ if (!bestmd.isStatic()) {
+ if (min.getExpression()==null) {
+ ExpressionNode en=new NameNode(new NameDescriptor("this"));
+ min.setExpression(en);
+ checkExpressionNode(md, nametable, min.getExpression(), null);
+ }
+ }
}
+ void checkOpNode(Descriptor md, SymbolTable nametable, OpNode on, TypeDescriptor td) {
+ checkExpressionNode(md, nametable, on.getLeft(), null);
+ if (on.getRight()!=null)
+ checkExpressionNode(md, nametable, on.getRight(), null);
+ TypeDescriptor ltd=on.getLeft().getType();
+ TypeDescriptor rtd=on.getRight()!=null?on.getRight().getType():null;
+ TypeDescriptor lefttype=null;
+ TypeDescriptor righttype=null;
+ Operation op=on.getOp();
+
+ switch(op.getOp()) {
+ case Operation.LOGIC_OR:
+ case Operation.LOGIC_AND:
+ if (!(rtd.isBoolean()))
+ throw new Error();
+ on.setRightType(rtd);
+ case Operation.LOGIC_NOT:
+ if (!(ltd.isBoolean()))
+ throw new Error();
+ //no promotion
+ on.setLeftType(ltd);
+
+ on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
+ break;
+
+ case Operation.BIT_OR:
+ case Operation.BIT_XOR:
+ case Operation.BIT_AND:
+ // 5.6.2 Binary Numeric Promotion
+ //TODO unboxing of reference objects
+ if (ltd.isDouble()||rtd.isDouble())
+ throw new Error();
+ else if (ltd.isFloat()||rtd.isFloat())
+ throw new Error();
+ else if (ltd.isLong()||rtd.isLong())
+ lefttype=new TypeDescriptor(TypeDescriptor.LONG);
+ else
+ lefttype=new TypeDescriptor(TypeDescriptor.INT);
+ righttype=lefttype;
+
+ on.setLeftType(lefttype);
+ on.setRightType(righttype);
+ on.setType(lefttype);
+ break;
+
+ case Operation.EQUAL:
+ case Operation.NOTEQUAL:
+ // 5.6.2 Binary Numeric Promotion
+ //TODO unboxing of reference objects
+ if (ltd.isBoolean()||rtd.isBoolean()) {
+ if (!(ltd.isBoolean()&&rtd.isBoolean()))
+ throw new Error();
+ righttype=lefttype=new TypeDescriptor(TypeDescriptor.BOOLEAN);
+ } else if (ltd.isPtr()||ltd.isArray()||rtd.isPtr()||rtd.isArray()) {
+ if (!((ltd.isPtr()||ltd.isArray())&&(rtd.isPtr()||rtd.isArray())))
+ throw new Error();
+ righttype=rtd;
+ lefttype=ltd;
+ } else if (ltd.isDouble()||rtd.isDouble())
+ righttype=lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
+ else if (ltd.isFloat()||rtd.isFloat())
+ righttype=lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
+ else if (ltd.isLong()||rtd.isLong())
+ righttype=lefttype=new TypeDescriptor(TypeDescriptor.LONG);
+ else
+ righttype=lefttype=new TypeDescriptor(TypeDescriptor.INT);
+
+ on.setLeftType(lefttype);
+ on.setRightType(righttype);
+ on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
+ break;
+
+
+
+ case Operation.LT:
+ case Operation.GT:
+ case Operation.LTE:
+ case Operation.GTE:
+ // 5.6.2 Binary Numeric Promotion
+ //TODO unboxing of reference objects
+ if (!ltd.isNumber()||!rtd.isNumber())
+ throw new Error();
+
+ if (ltd.isDouble()||rtd.isDouble())
+ lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
+ else if (ltd.isFloat()||rtd.isFloat())
+ lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
+ else if (ltd.isLong()||rtd.isLong())
+ lefttype=new TypeDescriptor(TypeDescriptor.LONG);
+ else
+ lefttype=new TypeDescriptor(TypeDescriptor.INT);
+ righttype=lefttype;
+ on.setLeftType(lefttype);
+ on.setRightType(righttype);
+ on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
+ break;
+
+ case Operation.ADD:
+ //TODO: Need special case for strings eventually
+
+
+ case Operation.SUB:
+ case Operation.MULT:
+ case Operation.DIV:
+ case Operation.MOD:
+ // 5.6.2 Binary Numeric Promotion
+ //TODO unboxing of reference objects
+ if (ltd.isArray()||rtd.isArray()||!ltd.isNumber()||!rtd.isNumber())
+ throw new Error("Error in "+on.printNode(0));
+
+ if (ltd.isDouble()||rtd.isDouble())
+ lefttype=new TypeDescriptor(TypeDescriptor.DOUBLE);
+ else if (ltd.isFloat()||rtd.isFloat())
+ lefttype=new TypeDescriptor(TypeDescriptor.FLOAT);
+ else if (ltd.isLong()||rtd.isLong())
+ lefttype=new TypeDescriptor(TypeDescriptor.LONG);
+ else
+ lefttype=new TypeDescriptor(TypeDescriptor.INT);
+ righttype=lefttype;
+ on.setLeftType(lefttype);
+ on.setRightType(righttype);
+ on.setType(lefttype);
+ break;
+
+ case Operation.LEFTSHIFT:
+ case Operation.RIGHTSHIFT:
+ if (!rtd.isIntegerType())
+ throw new Error();
+ //5.6.1 Unary Numeric Promotion
+ if (rtd.isByte()||rtd.isShort()||rtd.isInt())
+ righttype=new TypeDescriptor(TypeDescriptor.INT);
+ else
+ righttype=rtd;
+
+ on.setRightType(righttype);
+ if (!ltd.isIntegerType())
+ throw new Error();
+ case Operation.UNARYPLUS:
+ case Operation.UNARYMINUS:
+ /* case Operation.POSTINC:
+ case Operation.POSTDEC:
+ case Operation.PREINC:
+ case Operation.PREDEC:*/
+ if (!ltd.isNumber())
+ throw new Error();
+ //5.6.1 Unary Numeric Promotion
+ if (ltd.isByte()||ltd.isShort()||ltd.isInt())
+ lefttype=new TypeDescriptor(TypeDescriptor.INT);
+ else
+ lefttype=ltd;
+ on.setLeftType(lefttype);
+ on.setType(lefttype);
+ break;
+ default:
+ throw new Error(op.toString());
+ }
+
+ if (td!=null)
+ if (!typeutil.isSuperorType(td, on.getType())) {
+ System.out.println(td);
+ System.out.println(on.getType());
+ throw new Error("Type of rside not compatible with type of lside"+on.printNode(0));
+ }
+ }
}
projects / IRC.git / blobdiff