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modified: src/de/dhbwstuttgart/typeinference/unify/RuleSet.java

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modified:   src/de/dhbwstuttgart/typeinference/unify/distributeVariance.java
greaterFUNN und smallFUNN fuer generierte TPHs Variance gesetzt
	modified:   test/javFiles/Lambda.jav
vom bytecode ruebergeholt
This commit is contained in:
Martin Plümicke 2018-05-18 09:55:45 +02:00
parent d81c06cdd9
commit 6b1896f58c
3 changed files with 50 additions and 30 deletions
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35
src/de/dhbwstuttgart/typeinference/unify/RuleSet.java
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@ -24,6 +24,7 @@ import de.dhbwstuttgart.typeinference.unify.model.Unifier;
import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
import de.dhbwstuttgart.typeinference.unify.model.WildcardType;
import de.dhbwstuttgart.typeinference.unify.distributeVariance;
import java.io.FileWriter;
import java.io.IOException;
@ -778,7 +779,8 @@ public class RuleSet implements IRuleSet{
} );
return Optional.of(result);
}
@Override
public Optional<Set<UnifyPair>> greaterFunN(UnifyPair pair) {
if(pair.getPairOp() != PairOperator.SMALLERDOT)
@ -794,13 +796,22 @@ public class RuleSet implements IRuleSet{
Set<UnifyPair> result = new HashSet<UnifyPair>();
UnifyType[] freshPlaceholders = new UnifyType[funNLhsType.getTypeParams().size()];
for(int i = 0; i < freshPlaceholders.length; i++)
freshPlaceholders[i] = PlaceholderType.freshPlaceholder();
Integer variance = ((PlaceholderType)rhsType).getVariance();
Integer inversVariance = distributeVariance.inverseVariance(variance);
UnifyType[] freshPlaceholders = new UnifyType[funNLhsType.getTypeParams().size()];
for(int i = 0; i < freshPlaceholders.length-1; i++) {
freshPlaceholders[i] = PlaceholderType.freshPlaceholder();
((PlaceholderType)freshPlaceholders[i]).setVariance(inversVariance);
}
freshPlaceholders[freshPlaceholders.length-1] = PlaceholderType.freshPlaceholder();
((PlaceholderType)freshPlaceholders[freshPlaceholders.length-1]).setVariance(variance);
result.add(new UnifyPair(funNLhsType.getTypeParams().get(funNLhsType.getTypeParams().size()-1), freshPlaceholders[funNLhsType.getTypeParams().size()-1], PairOperator.SMALLERDOT, pair.getSubstitution(), pair.getBasePair()));
for(int i = 0; i < funNLhsType.getTypeParams().size()-1; i++)
for(int i = 0; i < funNLhsType.getTypeParams().size()-1; i++) {
result.add(new UnifyPair(freshPlaceholders[i], funNLhsType.getTypeParams().get(i), PairOperator.SMALLERDOT, pair.getSubstitution(), pair.getBasePair()));
}
result.add(new UnifyPair(rhsType, funNLhsType.setTypeParams(new TypeParams(freshPlaceholders)), PairOperator.EQUALSDOT, pair.getSubstitution(), pair.getBasePair()));
result.stream().forEach(x -> { UnifyType l = x.getLhsType();
@ -826,13 +837,23 @@ public class RuleSet implements IRuleSet{
Set<UnifyPair> result = new HashSet<UnifyPair>();
Integer variance = ((PlaceholderType)lhsType).getVariance();
Integer inversVariance = distributeVariance.inverseVariance(variance);
UnifyType[] freshPlaceholders = new UnifyType[funNRhsType.getTypeParams().size()];
for(int i = 0; i < freshPlaceholders.length; i++)
for(int i = 0; i < freshPlaceholders.length-1; i++) {
freshPlaceholders[i] = PlaceholderType.freshPlaceholder();
((PlaceholderType)freshPlaceholders[i]).setVariance(inversVariance);
}
freshPlaceholders[freshPlaceholders.length-1] = PlaceholderType.freshPlaceholder();
((PlaceholderType)freshPlaceholders[freshPlaceholders.length-1]).setVariance(variance);
result.add(new UnifyPair(freshPlaceholders[funNRhsType.getTypeParams().size()-1], funNRhsType.getTypeParams().get(funNRhsType.getTypeParams().size()-1), PairOperator.SMALLERDOT, pair.getSubstitution(), pair.getBasePair()));
for(int i = 0; i < funNRhsType.getTypeParams().size()-1; i++)
for(int i = 0; i < funNRhsType.getTypeParams().size()-1; i++) {
result.add(new UnifyPair(funNRhsType.getTypeParams().get(i), freshPlaceholders[i], PairOperator.SMALLERDOT, pair.getSubstitution(), pair.getBasePair()));
}
result.add(new UnifyPair(lhsType, funNRhsType.setTypeParams(new TypeParams(freshPlaceholders)), PairOperator.EQUALSDOT, pair.getSubstitution(), pair.getBasePair()));
result.stream().forEach(x -> { UnifyType l = x.getLhsType();

23
src/de/dhbwstuttgart/typeinference/unify/distributeVariance.java
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@ -11,6 +11,18 @@ import de.dhbwstuttgart.typeinference.unify.model.TypeParams;
import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
public class distributeVariance extends visitUnifyTypeVisitor<Integer> {
public static int inverseVariance(int variance) {
Integer ret = 0;
if (variance == 1) {
ret = -1;
}
if (variance == -1) {
ret = 1;
}
return ret;
}
@Override
public PlaceholderType visit(PlaceholderType phty, Integer ht) {
@ -30,16 +42,9 @@ public class distributeVariance extends visitUnifyTypeVisitor<Integer> {
List<UnifyType> param = new ArrayList<>(funnty.getTypeParams().get().length);
param.addAll(Arrays.asList(funnty.getTypeParams().get()));
UnifyType resultType = param.remove(param.size()-1);
Integer htInverse = 0;
if (ht == 1) {
htInverse = -1;
}
if (ht == -1) {
htInverse = 1;
}
Integer htInverse1 = htInverse;
Integer htInverse = inverseVariance(ht);
param = param.stream()
.map(x -> x.accept(this, htInverse1))
.map(x -> x.accept(this, htInverse))
.collect(Collectors.toCollection(ArrayList::new));
param.add(resultType.accept(this, ht));
return FunNType.getFunNType(new TypeParams(param));

22
test/javFiles/Lambda.jav
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@ -1,18 +1,12 @@
class Lambda {
import java.lang.Integer;
method(){
return ((f) -> f);
public class Lambda {
m () {
var lam1 = (Integer x) -> {
return x;
};
return lam1;
}
}
/*
interface Fun0<A>{
A apply();
}
interface Fun1<A,B>{
A apply(B b);
}
interface Fun2<A,B,C>{
A apply(B b, C c);
}
*/