+++ /dev/null
-package IR.Tree;
-
-import java.util.*;
-import IR.*;
-
-public class SemanticCheck {
- State state;
- TypeUtil typeutil;
-
- public SemanticCheck(State state, TypeUtil tu) {
- this.state=state;
- this.typeutil=tu;
- }
-
- public void semanticCheck() {
- SymbolTable classtable=state.getClassSymbolTable();
- Iterator it=classtable.getDescriptorsIterator();
- // Do descriptors first
- while(it.hasNext()) {
- ClassDescriptor cd=(ClassDescriptor)it.next();
- //System.out.println("Checking class: "+cd);
- //Set superclass link up
- if (cd.getSuper()!=null) {
- cd.setSuper(typeutil.getClass(cd.getSuper()));
- // Link together Field, 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);
- checkField(cd,fd);
- }
-
- for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
- MethodDescriptor md=(MethodDescriptor)method_it.next();
- checkMethod(cd,md);
- }
- }
-
- it=classtable.getDescriptorsIterator();
- // Do descriptors first
- while(it.hasNext()) {
- ClassDescriptor cd=(ClassDescriptor)it.next();
- for(Iterator method_it=cd.getMethods(); method_it.hasNext();) {
- MethodDescriptor md=(MethodDescriptor)method_it.next();
- checkMethodBody(cd,md);
- }
- }
-
- 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 */
- 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;
- } 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 in "+td);
- 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.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 */
- 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) {
- ClassDescriptor superdesc=cd.getSuperDesc();
- if (superdesc!=null) {
- Set possiblematches=superdesc.getMethodTable().getSet(md.getSymbol());
- for(Iterator methodit=possiblematches.iterator(); methodit.hasNext();) {
- MethodDescriptor matchmd=(MethodDescriptor)methodit.next();
- if (md.matches(matchmd)) {
- if (matchmd.getModifiers().isFinal()) {
- throw new Error("Try to override final method in method:"+md+" declared in "+cd);
- }
- }
- }
- }
- BlockNode bn=state.getMethodBody(md);
- checkBlockNode(md, md.getParameterTable(),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++) {
- BlockStatementNode bsn=bn.get(i);
- checkBlockStatementNode(md, bn.getVarTable(),bsn);
- }
- }
-
- public void checkBlockStatementNode(Descriptor md, SymbolTable nametable, BlockStatementNode bsn) {
- switch(bsn.kind()) {
- case Kind.BlockExpressionNode:
- checkBlockExpressionNode(md, nametable,(BlockExpressionNode)bsn);
- return;
-
- case Kind.DeclarationNode:
- checkDeclarationNode(md, nametable, (DeclarationNode)bsn);
- return;
-
- case Kind.TagDeclarationNode:
- checkTagDeclarationNode(md, nametable, (TagDeclarationNode)bsn);
- return;
-
- case Kind.IfStatementNode:
- checkIfStatementNode(md, nametable, (IfStatementNode)bsn);
- return;
-
- case Kind.LoopNode:
- checkLoopNode(md, nametable, (LoopNode)bsn);
- return;
-
- case Kind.ReturnNode:
- checkReturnNode(md, nametable, (ReturnNode)bsn);
- return;
-
- case Kind.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(Descriptor md, SymbolTable nametable, BlockExpressionNode ben) {
- checkExpressionNode(md, nametable, ben.getExpression(), null);
- }
-
- void checkDeclarationNode(Descriptor md, SymbolTable nametable, DeclarationNode dn) {
- VarDescriptor vd=dn.getVarDescriptor();
- checkTypeDescriptor(vd.getType());
- Descriptor d=nametable.get(vd.getSymbol());
- if ((d==null)||
- (d instanceof FieldDescriptor)) {
- nametable.add(vd);
- } else
- throw new Error(vd.getSymbol()+" in "+md+" defined a second time");
- 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(Descriptor md, SymbolTable nametable, SubBlockNode sbn) {
- checkBlockNode(md, nametable, sbn.getBlockNode());
- }
-
- void checkAtomicNode(Descriptor md, SymbolTable nametable, AtomicNode sbn) {
- checkBlockNode(md, nametable, sbn.getBlockNode());
- }
-
- 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());
- if (isn.getFalseBlock()!=null)
- checkBlockNode(md, nametable, isn.getFalseBlock());
- }
-
- void checkExpressionNode(Descriptor md, SymbolTable nametable, ExpressionNode en, TypeDescriptor td) {
- switch(en.kind()) {
- case Kind.AssignmentNode:
- checkAssignmentNode(md,nametable,(AssignmentNode)en,td);
- return;
-
- case Kind.CastNode:
- checkCastNode(md,nametable,(CastNode)en,td);
- return;
-
- case Kind.CreateObjectNode:
- checkCreateObjectNode(md,nametable,(CreateObjectNode)en,td);
- return;
-
- case Kind.FieldAccessNode:
- checkFieldAccessNode(md,nametable,(FieldAccessNode)en,td);
- return;
-
- case Kind.ArrayAccessNode:
- checkArrayAccessNode(md,nametable,(ArrayAccessNode)en,td);
- return;
-
- case Kind.LiteralNode:
- checkLiteralNode(md,nametable,(LiteralNode)en,td);
- return;
-
- case Kind.MethodInvokeNode:
- checkMethodInvokeNode(md,nametable,(MethodInvokeNode)en,td);
- return;
-
- case Kind.NameNode:
- checkNameNode(md,nametable,(NameNode)en,td);
- return;
-
- case Kind.OpNode:
- checkOpNode(md,nametable,(OpNode)en,td);
- return;
- }
- throw new Error();
- }
-
- void checkCastNode(Descriptor md, SymbolTable nametable, CastNode cn, TypeDescriptor td) {
- /* Get type descriptor */
- if (cn.getType()==null) {
- NameDescriptor typenamed=cn.getTypeName().getName();
- String typename=typenamed.toString();
- TypeDescriptor ntd=new TypeDescriptor(typeutil.getClass(typename));
- cn.setType(ntd);
- }
-
- /* Check the type descriptor */
- TypeDescriptor cast_type=cn.getType();
- checkTypeDescriptor(cast_type);
-
- /* Type check */
- if (td!=null) {
- if (!typeutil.isSuperorType(td,cast_type))
- throw new Error("Cast node returns "+cast_type+", but need "+td);
- }
-
- ExpressionNode en=cn.getExpression();
- checkExpressionNode(md, nametable, en, null);
- TypeDescriptor etd=en.getType();
- if (typeutil.isSuperorType(cast_type,etd)) /* Cast trivially succeeds */
- return;
-
- if (typeutil.isSuperorType(etd,cast_type)) /* Cast may succeed */
- return;
- 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(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=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 + " in "+fan.printNode(0)+" in "+md);
- fan.setField(fd);
- if (td!=null)
- if (!typeutil.isSuperorType(td,fan.getType()))
- throw new Error("Field node returns "+fan.getType()+", but need "+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.NULL));
- } else if (o instanceof Integer) {
- ln.setType(new TypeDescriptor(TypeDescriptor.INT));
- } else if (o instanceof Long) {
- ln.setType(new TypeDescriptor(TypeDescriptor.LONG));
- } else if (o instanceof Float) {
- ln.setType(new TypeDescriptor(TypeDescriptor.FLOAT));
- } else if (o instanceof 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(Descriptor md, SymbolTable nametable, NameNode nn, TypeDescriptor td) {
- NameDescriptor nd=nn.getName();
- 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 in: "+md);
- }
- 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);
- }
- }
-
- 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);
-
-
- /* 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 (an.getDest().getType().isString()&&an.getOperation().getOp()==AssignOperation.PLUSEQ) {
- //String add
- ClassDescriptor stringcl=typeutil.getClass(TypeUtil.StringClass);
- TypeDescriptor stringtd=new TypeDescriptor(stringcl);
- NameDescriptor nd=new NameDescriptor("String");
- NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
-
- if (!(an.getSrc().getType().isString()&&(an.getSrc() instanceof OpNode))) {
- MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
- rightmin.addArgument(an.getSrc());
- an.right=rightmin;
- checkExpressionNode(md, nametable, an.getSrc(), null);
- }
- }
-
-
- 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(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());
- } else {
- //For loop case
- /* Link in the initializer naming environment */
- BlockNode bn=ln.getInitializer();
- bn.getVarTable().setParent(nametable);
- for(int i=0; i<bn.size(); i++) {
- BlockStatementNode bsn=bn.get(i);
- checkBlockStatementNode(md, bn.getVarTable(),bsn);
- }
- //check the condition
- checkExpressionNode(md, bn.getVarTable(), ln.getCondition(), new TypeDescriptor(TypeDescriptor.BOOLEAN));
- checkBlockNode(md, bn.getVarTable(), ln.getBody());
- checkBlockNode(md, bn.getVarTable(), ln.getUpdate());
- }
- }
-
-
- void checkCreateObjectNode(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();
-
- 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 */
- if (con.numArgs()!=currmd.numParameters())
- continue;
- for(int i=0; i<con.numArgs(); i++) {
- if (!typeutil.isSuperorType(currmd.getParamType(i),tdarray[i]))
- continue NextMethod;
- }
- /* Local allocations can't call global allocator */
- if (!con.isGlobal()&&currmd.isGlobal())
- continue;
-
- /* Method okay so far */
- if (bestmd==null)
- bestmd=currmd;
- else {
- if (typeutil.isMoreSpecific(currmd,bestmd)) {
- bestmd=currmd;
- } else if (con.isGlobal()&&match(currmd, bestmd)) {
- if (currmd.isGlobal()&&!bestmd.isGlobal())
- bestmd=currmd;
- else if (currmd.isGlobal()&&bestmd.isGlobal())
- throw new Error();
- } else if (!typeutil.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)+" in "+md);
- con.setConstructor(bestmd);
- }
- }
-
-
- /** Check to see if md1 is the same specificity as md2.*/
-
- boolean match(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 (!md2.getParamType(i).equals(md1.getParamType(i)))
- return false;
- }
- if (!md2.getReturnType().equals(md1.getReturnType()))
- return false;
-
- if (!md2.getClassDesc().equals(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 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 (rootname.equals("super")) {
- ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
- typetolookin=new TypeDescriptor(supercd);
- } else 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("md = "+ md.toString()+ " "+min.getBaseName()+" undefined");
- typetolookin=new TypeDescriptor(cd);
- }
- } else if ((md instanceof MethodDescriptor)&&min.getMethodName().equals("super")) {
- ClassDescriptor supercd=((MethodDescriptor)md).getClassDesc().getSuperDesc();
- min.methodid=supercd.getSymbol();
- typetolookin=new TypeDescriptor(supercd);
- } 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 (typeutil.isMoreSpecific(currmd,bestmd)) {
- bestmd=currmd;
- } else if (!typeutil.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)+" in class: " + classtolookin+" in "+md);
- 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.COMP:
- // 5.6.2 Binary Numeric Promotion
- //TODO unboxing of reference objects
- if (ltd.isDouble())
- throw new Error();
- else if (ltd.isFloat())
- throw new Error();
- else if (ltd.isLong())
- lefttype=new TypeDescriptor(TypeDescriptor.LONG);
- else
- lefttype=new TypeDescriptor(TypeDescriptor.INT);
- on.setLeftType(lefttype);
- on.setType(lefttype);
- 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.ISAVAILABLE:
- if (!(ltd.isPtr())) {
- throw new Error("Can't use isavailable on non-pointers/non-parameters.");
- }
- lefttype=ltd;
- on.setLeftType(lefttype);
- on.setType(new TypeDescriptor(TypeDescriptor.BOOLEAN));
- 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()||rtd.isPtr()) {
- if (!(ltd.isPtr()&&rtd.isPtr()))
- 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:
- if (ltd.isString()||rtd.isString()) {
- ClassDescriptor stringcl=typeutil.getClass(TypeUtil.StringClass);
- TypeDescriptor stringtd=new TypeDescriptor(stringcl);
- NameDescriptor nd=new NameDescriptor("String");
- NameDescriptor valuend=new NameDescriptor(nd, "valueOf");
- if (!(ltd.isString()&&(on.getLeft() instanceof OpNode))) {
- MethodInvokeNode leftmin=new MethodInvokeNode(valuend);
- leftmin.addArgument(on.getLeft());
- on.left=leftmin;
- checkExpressionNode(md, nametable, on.getLeft(), null);
- }
-
- if (!(rtd.isString()&&(on.getRight() instanceof OpNode))) {
- MethodInvokeNode rightmin=new MethodInvokeNode(valuend);
- rightmin.addArgument(on.getRight());
- on.right=rightmin;
- checkExpressionNode(md, nametable, on.getRight(), null);
- }
-
- on.setLeftType(stringtd);
- on.setRightType(stringtd);
- on.setType(stringtd);
- break;
- }
-
- 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:
- case Operation.URIGHTSHIFT:
- 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