/** @see jaskell.compiler.JaskellVisitor#visit(ConstructorPattern) */
public Object visit(ConstructorPattern a) {
String cname = a.getConstructor().getName();
/* retrieve parameter types of constructor */
ConstructorDefinition ctor = (ConstructorDefinition) a.getConstructor().lookup(cname);
if (ctor == null) throw new TypeError("Undefined constructor pattern " + a);
/* type of data constructed by constructor */
TypeInstantiator ti = new TypeInstantiator(ctor.getDataType());
Type rtype = ti.instance();
Map map = ti.getMap();
TypeSubstitution ts = new TypeSubstitution(map);
Iterator ittypes = ctor.getParameters().iterator();
/* retrieve type of patterns */
Iterator it = a.getSubPatterns();
while (it.hasNext()) {
try {
Pattern p = (Pattern) it.next();
Type actual = TypeFactory.freshBinding();
Type formal = ts.substitute((Type) ittypes.next());
/* unify both types */
p.setType(tu.unify(formal, actual, typeVariablesMap));
} catch (NoSuchElementException nex) {
throw new TypeError("Wrong number of arguments to pattern " + a);
}
}
a.setType(rtype);
return a.getType();
}
@Test
public void parametrizedTypeType_methods_tests() {
JavaSymbol.PackageJavaSymbol packageSymbol =
new JavaSymbol.PackageJavaSymbol("org.foo.bar", null);
JavaSymbol.TypeJavaSymbol typeSymbol =
new JavaSymbol.TypeJavaSymbol(Flags.PUBLIC, "MyType", packageSymbol);
JavaSymbol.TypeVariableJavaSymbol typeVariableSymbol =
new JavaSymbol.TypeVariableJavaSymbol("E", typeSymbol);
ClassJavaType classType = (ClassJavaType) typeSymbol.type;
TypeVariableJavaType typeVariableType = (TypeVariableJavaType) typeVariableSymbol.type;
TypeSubstitution typeSubstitution = new TypeSubstitution();
typeSubstitution.add(typeVariableType, classType);
ParametrizedTypeJavaType ptt = new ParametrizedTypeJavaType(typeSymbol, typeSubstitution);
assertThat(ptt.substitution(typeVariableType)).isEqualTo(classType);
assertThat(
ptt.substitution(
new TypeVariableJavaType(new JavaSymbol.TypeVariableJavaSymbol("F", typeSymbol))))
.isNull();
assertThat(ptt.typeParameters()).hasSize(1);
assertThat(ptt.typeParameters()).contains(typeVariableType);
ptt = new ParametrizedTypeJavaType(typeSymbol, null);
assertThat(ptt.substitution(typeVariableType)).isNull();
assertThat(ptt.typeParameters()).isEmpty();
assertThat(ptt.isClass()).isTrue();
assertThat(ptt.isParameterized()).isTrue();
assertThat(ptt.rawType.isClass()).isTrue();
assertThat(ptt.rawType.isParameterized()).isFalse();
}
private JavaType handleTypeArguments(
List<JavaType> typeParams, JavaType type, JavaSymbol.MethodJavaSymbol methodSymbol) {
if (!typeParams.isEmpty() && methodSymbol.typeVariableTypes.size() == typeParams.size()) {
TypeSubstitution typeSubstitution = new TypeSubstitution();
int i = 0;
for (JavaType.TypeVariableJavaType typeVariableType : methodSymbol.typeVariableTypes) {
typeSubstitution.add(typeVariableType, typeParams.get(i));
i++;
}
return substituteTypeParameter(type, typeSubstitution);
}
return type;
}
/** @see jaskell.compiler.JaskellVisitor#visit(Application) */
public Object visit(Application a) {
try {
/* get type of function */
Expression fun = a.getFunction();
/* get type deduced from arguments */
LinkedList l = new LinkedList();
Iterator it = a.getArgs().iterator();
while (it.hasNext()) {
Expression e = (Expression) it.next();
l.add((Type) e.visit(this));
}
Type vt = TypeFactory.freshBinding();
Type ft = Types.fun(l, vt);
log.finer("TypeChecker => In application " + a + ", type is " + ft);
/* apply substitution on both types */
ft = subst.substitute(ft);
/* try to unify function type and constructed types */
Type t = (Type) fun.visit(this);
log.finer("In application, function " + fun + " :: " + t);
t = subst.substitute(t);
log.finer("In application, trying to unify function type " + t + " with body " + ft);
/*
* TODO : problem with unification of constrained types
*/
TypeApplication uni = (TypeApplication) tu.unify(t, ft, typeVariablesMap);
/* sets type of functional expression - this allows
* polymorphic functions to receive several types
* in the same code */
// fun.setType(uni);
/* apply arguments type to compute return type */
log.finer("Done unify application :" + uni);
it = PrimitiveType.functionIterator(uni);
Iterator it2 = l.iterator();
TypeApplication ut = uni;
while (it2.hasNext()) {
/* type of argument */
Type at = (Type) it2.next();
ut = (TypeApplication) it.next();
/* try unification */
tu.unify(((TypeApplication) ut.getDomain()).getRange(), at, new HashMap(typeVariablesMap));
}
ft = subst.substitute(ft);
fun.setType(ft);
log.finer("Setting type of functional element [" + fun + "] to :" + ft);
a.setType(ut.getRange());
return ut.getRange();
} catch (TypeError te) {
if (te.getLineCol() == null) te.setLineCol(a.getTag("source"));
throw te;
}
}
@Nullable
public TypeProjection substitute(@NotNull TypeProjection typeProjection) {
TypeProjection substitutedTypeProjection = substituteWithoutApproximation(typeProjection);
if (!substitution.approximateCapturedTypes()) {
return substitutedTypeProjection;
}
return CapturedTypeApproximationKt.approximateCapturedTypesIfNecessary(
substitutedTypeProjection);
}
@Override
public void visitEnd() {
if (!typeArguments.isEmpty()) {
JavaSymbol.TypeJavaSymbol readSymbol = typeRead.symbol;
readSymbol.complete();
// Mismatch between type variable and type arguments means we are lacking some pieces of
// bytecode to resolve substitution properly.
if (typeArguments.size() == readSymbol.typeVariableTypes.size()) {
TypeSubstitution substitution = new TypeSubstitution();
int i = 0;
for (JavaType typeArgument : typeArguments) {
substitution.add(readSymbol.typeVariableTypes.get(i), typeArgument);
i++;
}
typeRead = parametrizedTypeCache.getParametrizedTypeType(readSymbol, substitution);
}
}
}
private JavaType substituteTypeParameter(JavaType type, TypeSubstitution substitution) {
JavaType substitutedType = substitution.substitutedType(type);
if (substitutedType != null) {
return substitutedType;
}
if (type instanceof JavaType.ParametrizedTypeJavaType) {
JavaType.ParametrizedTypeJavaType ptt = (JavaType.ParametrizedTypeJavaType) type;
TypeSubstitution newSubstitution = new TypeSubstitution();
for (Map.Entry<JavaType.TypeVariableJavaType, JavaType> entry :
ptt.typeSubstitution.substitutionEntries()) {
newSubstitution.add(
entry.getKey(), substituteTypeParameter(entry.getValue(), substitution));
}
return parametrizedTypeCache.getParametrizedTypeType(
ptt.rawType.getSymbol(), newSubstitution);
}
return type;
}
@Test
public void erasure_of_type_variable() {
JavaSymbol.TypeJavaSymbol typeSymbol =
new JavaSymbol.TypeJavaSymbol(
Flags.PUBLIC, "MyType", new JavaSymbol.PackageJavaSymbol("org.foo.bar", null));
TypeSubstitution typeSubstitution = new TypeSubstitution();
typeSubstitution.add(
(TypeVariableJavaType) new JavaSymbol.TypeVariableJavaSymbol("T", typeSymbol).type,
typeSymbol.type);
ParametrizedTypeJavaType parametrizedType =
new ParametrizedTypeJavaType(typeSymbol, typeSubstitution);
TypeVariableJavaType typeVariableType =
(TypeVariableJavaType) new JavaSymbol.TypeVariableJavaSymbol("X", typeSymbol).type;
typeVariableType.bounds = ImmutableList.<JavaType>of(parametrizedType);
assertThat(typeVariableType.erasure()).isNotEqualTo(parametrizedType);
assertThat(typeVariableType.erasure()).isEqualTo(parametrizedType.erasure());
}
/** @see jaskell.compiler.JaskellVisitor#visit(Abstraction) */
public Object visit(Abstraction a) {
try {
Type t = a.getType();
if (t != null) return subst.substitute(t);
log.finest("Visiting abstraction : " + a);
Expression body = a.getBody();
/* duplicate bindings map to assign types to variables */
pushContext(a.getBindings());
/* create fresh type variables as type for each bound
* variable */
Iterator it = namesMap.values().iterator();
LinkedList tl = new LinkedList();
while (it.hasNext()) {
LocalBinding name = (LocalBinding) it.next();
Type vt = TypeFactory.freshBinding();
name.setType(vt);
tl.add(vt);
}
Type tv = TypeFactory.freshBinding();
/* create type with all variables for function */
Type ft = Types.fun(tl, tv);
log.finer("In abstraction, setting type to " + ft);
a.setType(ft);
/* analyze body */
Type bt = (Type) body.visit(this);
/* unify return type of function with type of body */
Type ret = tu.unify(PrimitiveType.getReturnType(ft), bt, typeVariablesMap);
TyvarSubstitution tys = new TyvarSubstitution(typeVariablesMap);
tys.visit(a);
log.finer("Done abstraction, setting type from " + ft + " to " + a.getType());
popContext();
return a.getType();
} catch (TypeError te) {
if (te.getLineCol() == null) te.setLineCol(a.getTag("source"));
throw te;
}
}
public boolean isEmpty() {
return substitution.isEmpty();
}
@NotNull
private TypeProjection unsafeSubstitute(
@NotNull TypeProjection originalProjection, int recursionDepth) throws SubstitutionException {
assertRecursionDepth(recursionDepth, originalProjection, substitution);
if (originalProjection.isStarProjection()) return originalProjection;
// The type is within the substitution range, i.e. T or T?
JetType type = originalProjection.getType();
TypeProjection replacement = substitution.get(type);
Variance originalProjectionKind = originalProjection.getProjectionKind();
if (replacement == null
&& FlexibleTypesKt.isFlexible(type)
&& !TypeCapabilitiesKt.isCustomTypeVariable(type)) {
Flexibility flexibility = FlexibleTypesKt.flexibility(type);
TypeProjection substitutedLower =
unsafeSubstitute(
new TypeProjectionImpl(originalProjectionKind, flexibility.getLowerBound()),
recursionDepth + 1);
TypeProjection substitutedUpper =
unsafeSubstitute(
new TypeProjectionImpl(originalProjectionKind, flexibility.getUpperBound()),
recursionDepth + 1);
Variance substitutedProjectionKind = substitutedLower.getProjectionKind();
assert (substitutedProjectionKind == substitutedUpper.getProjectionKind())
&& originalProjectionKind == Variance.INVARIANT
|| originalProjectionKind == substitutedProjectionKind
: "Unexpected substituted projection kind: "
+ substitutedProjectionKind
+ "; original: "
+ originalProjectionKind;
JetType substitutedFlexibleType =
DelegatingFlexibleType.create(
substitutedLower.getType(),
substitutedUpper.getType(),
flexibility.getExtraCapabilities());
return new TypeProjectionImpl(substitutedProjectionKind, substitutedFlexibleType);
}
if (KotlinBuiltIns.isNothing(type) || type.isError()) return originalProjection;
if (replacement != null) {
VarianceConflictType varianceConflict =
conflictType(originalProjectionKind, replacement.getProjectionKind());
// Captured type might be substituted in an opposite projection:
// out 'Captured (in Int)' = out Int
// in 'Captured (out Int)' = in Int
boolean allowVarianceConflict = CapturedTypeConstructorKt.isCaptured(type);
if (!allowVarianceConflict) {
//noinspection EnumSwitchStatementWhichMissesCases
switch (varianceConflict) {
case OUT_IN_IN_POSITION:
throw new SubstitutionException("Out-projection in in-position");
case IN_IN_OUT_POSITION:
// todo use the right type parameter variance and upper bound
return new TypeProjectionImpl(
Variance.OUT_VARIANCE, type.getConstructor().getBuiltIns().getNullableAnyType());
}
}
JetType substitutedType;
CustomTypeVariable typeVariable = TypeCapabilitiesKt.getCustomTypeVariable(type);
if (replacement.isStarProjection()) {
return replacement;
} else if (typeVariable != null) {
substitutedType = typeVariable.substitutionResult(replacement.getType());
} else {
// this is a simple type T or T?: if it's T, we should just take replacement, if T? - we
// make replacement nullable
substitutedType =
TypeUtils.makeNullableIfNeeded(replacement.getType(), type.isMarkedNullable());
}
// substitutionType.annotations = replacement.annotations ++ type.annotations
if (!type.getAnnotations().isEmpty()) {
Annotations typeAnnotations = filterOutUnsafeVariance(type.getAnnotations());
substitutedType =
TypeUtilsKt.replaceAnnotations(
substitutedType,
new CompositeAnnotations(substitutedType.getAnnotations(), typeAnnotations));
}
Variance resultingProjectionKind =
varianceConflict == VarianceConflictType.NO_CONFLICT
? combine(originalProjectionKind, replacement.getProjectionKind())
: originalProjectionKind;
return new TypeProjectionImpl(resultingProjectionKind, substitutedType);
}
// The type is not within the substitution range, i.e. Foo, Bar<T> etc.
return substituteCompoundType(originalProjection, recursionDepth);
}