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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $OldId: ErasurePhase.java,v 1.13 2002/11/14 15:58:22 schinz Exp $
// $Id$
package scalac.transformer;
import scalac.Global;
import scalac.*;
import scalac.backend.Primitive;
import scalac.backend.Primitives;
import scalac.checkers.Checker;
import scalac.checkers.CheckOwners;
import scalac.checkers.CheckSymbols;
import scalac.checkers.CheckTypes;
import scalac.checkers.CheckNames;
import scalac.symtab.Definitions;
import scalac.symtab.Symbol;
import scalac.symtab.Type;
import scalac.util.Debug;
public class ErasurePhase extends PhaseDescriptor {
public Definitions definitions;
public Primitives primitives;
public String name () {
return "erasure";
}
public String description () {
return "type eraser";
}
public String taskDescription() {
return "erased types";
}
public void apply(Global global) {
this.definitions = global.definitions;
this.primitives = global.primitives;
new Erasure(global).apply();
}
public void apply(Unit unit) {
this.definitions = unit.global.definitions;
this.primitives = unit.global.primitives;
new Erasure(unit.global).apply(unit);
}
private Type eraseParams(Type tp) {
switch (tp) {
case PolyType(_, Type result):
return eraseParams(result);
case MethodType(Symbol[] params, Type result):
Symbol[] params1 = Type.erasureMap.map(params);
if (params1 == params) return tp;
else return Type.MethodType(params1, result);
default:
return tp;
}
}
public Type transformInfo(Symbol sym, Type tp) {
if (sym.isClass()) return Type.erasureMap.map(tp);
if (sym.isType()) return tp;
if (sym == definitions.NULL) return tp.resultType().erasure();
switch (primitives.getPrimitive(sym)) {
case Primitive.IS : return tp;
case Primitive.AS : return tp;
case Primitive.BOX: return eraseParams(tp);
default : return tp.erasure();
}
}
public Checker[] postCheckers(Global global) {
return new Checker[] {
new CheckSymbols(global),
new CheckTypes(global),
new CheckOwners(global),
new CheckNames(global)
};
}
}
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