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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
// $OldId: ExplicitOuterClassesPhase.java,v 1.8 2002/08/21 14:08:18 paltherr Exp $
package scalac.transformer;
import scalac.*;
import scalac.checkers.*;
import scalac.symtab.*;
import scalac.util.*;
import java.util.HashMap;
public class ExplicitOuterClassesPhase extends PhaseDescriptor {
// Mapping from class constructor symbols to owner field symbols.
protected HashMap/*<Symbol,Symbol>*/ outerMap = new HashMap();
public String name () {
return "explicitouterclasses";
}
public String description () {
return "make links from inner classes to enclosing one explicit";
}
public String taskDescription() {
return "made outer links explicit";
}
public void apply(Global global) {
new ExplicitOuterClasses(global).apply();
}
public void apply(Unit unit) {
new ExplicitOuterClasses(unit.global).apply(unit);
}
public Checker[] postCheckers(Global global) {
return new Checker[] {
new CheckSymbols(global),
new CheckTypes(global),
new CheckOwners(global),
new CheckNames(global)
};
}
public Type transformInfo(Symbol sym, Type tp) {
if (sym != Symbol.NONE
&& sym.isConstructor()
&& sym.owner().isClass()
&& !(sym.isJava() || sym.owner().isRoot())) {
return addValueParam(tp, outerSym(sym));
} else
return tp;
}
/**
* Return the symbol for the outer parameter corresponding to the
* given constructor.
*/
protected Symbol outerSym(Symbol constSym) {
if (! outerMap.containsKey(constSym)) {
Symbol ownerSym = constSym.enclClass();
Name outerName =
Global.instance.freshNameCreator.newName(Names.OUTER_PREFIX);
Symbol outerSym =
new TermSymbol(constSym.pos, outerName, constSym, 0);
outerSym.setInfo(ownerSym.type());
outerMap.put(constSym, outerSym);
}
return (Symbol)outerMap.get(constSym);
}
/**
* Add the given value parameter to the type, which must be the
* type of a method, as the first argument.
*/
protected Type addValueParam(Type oldType, Symbol newValueParam) {
switch (oldType) {
case MethodType(Symbol[] vparams, Type result): {
Symbol[] newVParams = new Symbol[vparams.length + 1];
newVParams[0] = newValueParam;
System.arraycopy(vparams, 0, newVParams, 1, vparams.length);
return new Type.MethodType(newVParams, result);
}
case PolyType(Symbol[] tparams, Type result):
return new Type.PolyType(tparams, addValueParam(result, newValueParam));
default:
throw Global.instance.fail("invalid type", oldType);
}
}
}
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