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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.Phase;
import scalac.PhaseDescriptor;
import scalac.Unit;
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 Phase {
//########################################################################
// Private Fields
private final Definitions definitions;
private final Primitives primitives;
private final Erasure erasure;
//########################################################################
// Public Constructors
public ErasurePhase(Global global, PhaseDescriptor descriptor) {
super(global, descriptor);
this.definitions = global.definitions;
this.primitives = global.primitives;
this.erasure = new Erasure(global);
}
//########################################################################
// Public Methods
public void apply(Unit[] units) {
erasure.apply(units);
}
public Type transformInfo(Symbol sym, Type tp) {
if (sym.isClass() && sym.isSubClass(definitions.DOUBLE_CLASS)) return tp;
if (sym.isConstructor() && sym.constructorClass().isSubClass(definitions.ANYVAL_CLASS)) return 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 Type.PolyType(tp.typeParams(), Type.MethodType(tp.valueParams(), tp.resultType().erasure()));
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)
};
}
//########################################################################
// Private Methods
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;
}
}
//########################################################################
}
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