Examples with TypeParameter org.eclipse.ceylon.model.typechecker.model.TypeParameter used on opensource projects

Example 1 with TypeParameter

use of org.eclipse.ceylon.model.typechecker.model.TypeParameter in project ceylon by eclipse.

the class AbstractTransformer method canOptimiseReifiedTypeTest.

/**
 * Determine whether we can use a plain {@code instanceof} instead of
 * a full {@code Util.isReified()} for a {@code is} test
 */
private boolean canOptimiseReifiedTypeTest(Type type) {
    if (isJavaArray(type)) {
        if (isJavaObjectArray(type)) {
            MultidimensionalArray multiArray = getMultiDimensionalArrayInfo(type);
            // we can test, even if not fully reified in Java
            return multiArray.type.getDeclaration() instanceof ClassOrInterface;
        } else {
            // primitive array we can test
            return true;
        }
    }
    // we can optimise it if we've got a ClassOrInterface with only Anything type parameters
    TypeDeclaration typeDeclaration = type.getDeclaration();
    if (typeDeclaration instanceof ClassOrInterface == false)
        return false;
    for (Entry<TypeParameter, Type> entry : type.getTypeArguments().entrySet()) {
        TypeParameter tp = entry.getKey();
        // skip type params for qualifying types
        if (!tp.getDeclaration().equals(typeDeclaration))
            continue;
        if (!type.isCovariant(tp)) {
            return false;
        }
        java.util.List<Type> bounds = tp.getSatisfiedTypes();
        Type ta = entry.getValue();
        if ((bounds == null || bounds.isEmpty()) && !isAnything(ta)) {
            return false;
        }
        for (Type bound : bounds) {
            if (!ta.isSupertypeOf(bound)) {
                return false;
            }
        }
    }
    // they're all Anything (or supertypes of their upper bound) we can optimise, unless we have a container with type arguments
    Type qualifyingType = type.getQualifyingType();
    if (qualifyingType == null && // ignore qualifying types of static java declarations
    (ModelUtil.isCeylonDeclaration(type.getDeclaration()) || !type.getDeclaration().isStatic())) {
        Declaration declaration = type.getDeclaration();
        do {
            // it may be contained in a function or value, and we want its type
            Declaration enclosingDeclaration = getDeclarationContainer(declaration);
            if (enclosingDeclaration instanceof TypedDeclaration) {
                // must be in scope
                if (enclosingDeclaration.isParameterized())
                    return false;
                // look up the containers
                declaration = enclosingDeclaration;
            } else if (enclosingDeclaration instanceof TypeDeclaration) {
                // we can't optimise if that container has type arguments as they are not provided
                if (enclosingDeclaration.isParameterized())
                    return false;
                // look up the containers
                declaration = enclosingDeclaration;
            } else {
                // that's fucked up
                break;
            }
        // go up every containing typed declaration
        } while (declaration != null);
        // we can optimise!
        return true;
    } else if (qualifyingType != null) {
        // we can only optimise if the qualifying type can also be optimised
        return canOptimiseReifiedTypeTest(qualifyingType);
    } else {
        // we can optimise!
        return true;
    }
}

Example 2 with TypeParameter

use of org.eclipse.ceylon.model.typechecker.model.TypeParameter in project ceylon by eclipse.

the class AbstractTransformer method makeTypeArgs.

private ListBuffer<JCExpression> makeTypeArgs(boolean isCeylonCallable, int flags, Map<TypeParameter, Type> tas, java.util.List<TypeParameter> tps, Type simpleType) {
    ListBuffer<JCExpression> typeArgs = new ListBuffer<JCExpression>();
    for (TypeParameter tp : tps) {
        Type ta = tas.get(tp);
        // error handling
        if (ta == null)
            continue;
        boolean isDependedOn = hasDependentTypeParameters(tps, tp);
        // record whether we were initially working with Anything, because getNonNullType turns it into Object
        // and we need to treat "in Anything" specially below
        boolean isAnything = isAnything(ta);
        // we want, so we make sure it's not Null
        if (isOptional(ta) && !isNull(ta)) {
            // For an optional type T?:
            // - The Ceylon type Foo<T?> results in the Java type Foo<T>.
            ta = getNonNullType(ta);
        }
        // In a type argument Foo<X&Object> or Foo<X?> transform to just Foo<X>
        ta = simplifyType(ta);
        if (typeFact().isUnion(ta) || typeFact().isIntersection(ta)) {
            // conform with where raw types would be used between expressions and constructors
            if (((flags & (JT_EXTENDS | JT_SATISFIES)) != 0 && tp.getSelfTypedDeclaration() != null)) {
                // A bit ugly, but we need to escape from the loop and create a raw type, no generics
                if ((flags & (JT_EXTENDS | JT_SATISFIES)) != 0)
                    throw new BugException("rawSupertype() should prevent this method going raw when JT_EXTENDS | JT_SATISFIES");
                typeArgs = null;
                break;
            } else if ((flags & (__JT_FULL_TYPE | JT_EXTENDS | JT_SATISFIES)) == 0) {
                if ((flags & (JT_EXTENDS | JT_SATISFIES)) != 0)
                    throw new BugException("rawSupertype() should prevent this method going raw when JT_EXTENDS | JT_SATISFIES");
                typeArgs = null;
                break;
            }
        // otherwise just go on
        }
        if (isCeylonBoolean(ta) && !isTypeParameter(ta)) {
            ta = typeFact.getBooleanType();
        }
        JCExpression jta;
        if (!tp.getSatisfiedTypes().isEmpty()) {
            boolean needsCastForBounds = false;
            for (Type bound : tp.getSatisfiedTypes()) {
                bound = bound.substitute(tas, null);
                needsCastForBounds |= expressionGen().needsCast(ta, bound, false, false, false);
            }
            if (needsCastForBounds) {
                // replace with the first bound
                ta = tp.getSatisfiedTypes().get(0).substitute(tas, null);
                if (tp.getSatisfiedTypes().size() > 1 || isBoundsSelfDependant(tp) || isBoundsRecursive(simpleType, tp) || willEraseToObject(ta) || // we should reject it for all non-covariant types, unless we're in satisfies/extends
                ((flags & (JT_SATISFIES | JT_EXTENDS)) == 0 && !simpleType.isCovariant(tp))) {
                    if ((flags & (JT_EXTENDS | JT_SATISFIES)) != 0)
                        throw new BugException("rawSupertype() should prevent this method going raw when JT_EXTENDS | JT_SATISFIES");
                    // A bit ugly, but we need to escape from the loop and create a raw type, no generics
                    typeArgs = null;
                    break;
                }
            }
        }
        if (ta.isExactlyNothing() || // use the same erasure rules as bottom: prefer wildcards
        ((flags & (__JT_FULL_TYPE | JT_EXTENDS | JT_SATISFIES)) != 0 && (typeFact().isUnion(ta) || typeFact().isIntersection(ta)))) {
            // For the bottom type Bottom:
            if ((flags & (JT_CLASS_NEW)) != 0) {
                // A bit ugly, but we need to escape from the loop and create a raw type, no generics
                if ((flags & (JT_EXTENDS | JT_SATISFIES)) != 0)
                    throw new BugException("rawSupertype() should prevent this method going raw when JT_EXTENDS | JT_SATISFIES");
                typeArgs = null;
                break;
            } else {
                // Foo<Object> (see https://github.com/ceylon/ceylon-compiler/issues/633 for why)
                if ((flags & (JT_SATISFIES | JT_EXTENDS)) != 0) {
                    if (ta.isExactlyNothing()) {
                        jta = make().Type(syms().objectType);
                    } else {
                        if (!tp.getSatisfiedTypes().isEmpty()) {
                            // union or intersection: Use the common upper bound of the types
                            jta = makeJavaType(tp.getSatisfiedTypes().get(0), JT_TYPE_ARGUMENT);
                        } else {
                            jta = make().Type(syms().objectType);
                        }
                    }
                } else if (ta.isExactlyNothing()) {
                    // see https://github.com/ceylon/ceylon-compiler/issues/1003
                    if (simpleType.isContravariant(tp)) {
                        typeArgs = null;
                        break;
                    } else if (tp.isCovariant() && !isDependedOn) {
                        // DO NOT trust use-site covariance for Nothing, because we consider "out Nothing" to be the same
                        // as "Nothing". Only look at declaration-site covariance
                        jta = make().Wildcard(make().TypeBoundKind(BoundKind.EXTENDS), make().Type(syms().objectType));
                    } else {
                        jta = make().Type(syms().objectType);
                    }
                } else {
                    // see https://github.com/ceylon/ceylon/issues/6365
                    if (((flags & JT_CLASS_NEW) == 0) && simpleType.isContravariant(tp)) /* && !isDependedOn*/
                    {
                        jta = make().Wildcard(make().TypeBoundKind(BoundKind.SUPER), makeJavaType(ta, JT_TYPE_ARGUMENT));
                    } else if (((flags & JT_CLASS_NEW) == 0) && simpleType.isCovariant(tp) && !isDependedOn) {
                        jta = make().Wildcard(make().TypeBoundKind(BoundKind.EXTENDS), makeJavaType(ta, JT_TYPE_ARGUMENT));
                    } else {
                        jta = makeJavaType(ta, JT_TYPE_ARGUMENT);
                    }
                }
            }
        } else {
            // For an ordinary class or interface type T:
            if ((flags & (JT_SATISFIES | JT_EXTENDS)) != 0) {
                // - The Ceylon type Foo<T> appearing in an extends or satisfies clause
                // results in the Java type Foo<T>
                jta = makeJavaType(ta, JT_TYPE_ARGUMENT);
            } else {
                // - Foo<? super T> if Foo is contravariant in T
                if (((flags & JT_CLASS_NEW) == 0) && simpleType.isContravariant(tp) && (!isAnything || tp.isContravariant())) // FIXME: it may be necessary to uncomment this in the future,
                // see https://github.com/ceylon/ceylon/issues/6365
                /*&& !isDependedOn*/
                {
                    // DO NOT trust use-site contravariance for Anything, because we consider "in Anything" to be the same
                    // as "Anything". Only look at declaration-site contravariance
                    jta = make().Wildcard(make().TypeBoundKind(BoundKind.SUPER), makeJavaType(ta, JT_TYPE_ARGUMENT));
                } else if (((flags & JT_CLASS_NEW) == 0) && simpleType.isCovariant(tp) && !isDependedOn) {
                    jta = make().Wildcard(make().TypeBoundKind(BoundKind.EXTENDS), makeJavaType(ta, JT_TYPE_ARGUMENT));
                } else {
                    jta = makeJavaType(ta, JT_TYPE_ARGUMENT);
                }
            }
        }
        typeArgs.add(jta);
        if (isCeylonCallable) {
            // In the runtime Callable only has a single type param
            break;
        }
    }
    return typeArgs;
}

Example 3 with TypeParameter

use of org.eclipse.ceylon.model.typechecker.model.TypeParameter in project ceylon by eclipse.

the class AbstractTransformer method getTypeArguments.

private java.util.List<Type> getTypeArguments(Reference producedReference) {
    java.util.List<TypeParameter> typeParameters = getTypeParameters(producedReference);
    java.util.List<Type> typeArguments = new ArrayList<Type>(typeParameters.size());
    for (TypeParameter tp : typeParameters) {
        Type ta;
        Reference ref = producedReference;
        do {
            ta = ref.getTypeArguments().get(tp);
            ref = ref.getQualifyingType();
        } while (ta == null && ref != null);
        typeArguments.add(ta);
    }
    return typeArguments;
}

Example 4 with TypeParameter

use of org.eclipse.ceylon.model.typechecker.model.TypeParameter in project ceylon by eclipse.

the class AbstractTransformer method makeTypeParameter.

JCTypeParameter makeTypeParameter(TypeParameter declarationModel, java.util.List<Type> satisfiedTypesForBounds) {
    TypeParameter typeParameterForBounds = declarationModel;
    if (satisfiedTypesForBounds == null) {
        satisfiedTypesForBounds = declarationModel.getSatisfiedTypes();
    }
    // special case for method refinenement where Java doesn't let us refine the parameter bounds
    if (declarationModel.getContainer() instanceof Function) {
        Function method = (Function) declarationModel.getContainer();
        Function refinedMethod = (Function) method.getRefinedDeclaration();
        if (!Decl.equal(method, refinedMethod)) {
            // find the param index
            int index = method.getTypeParameters().indexOf(declarationModel);
            if (index == -1) {
                log.error("Failed to find type parameter index: " + declarationModel.getName());
            } else if (refinedMethod.getTypeParameters().size() > index) {
                // ignore smaller index than size since the typechecker would have found the error
                TypeParameter refinedTP = refinedMethod.getTypeParameters().get(index);
                if (!haveSameBounds(declarationModel, refinedTP)) {
                    // find the right instantiation of that type parameter
                    TypeDeclaration methodContainer = (TypeDeclaration) method.getContainer();
                    TypeDeclaration refinedMethodContainer = (TypeDeclaration) refinedMethod.getContainer();
                    // find the supertype that gave us that method and its type arguments
                    Type supertype = methodContainer.getType().getSupertype(refinedMethodContainer);
                    satisfiedTypesForBounds = new ArrayList<Type>(refinedTP.getSatisfiedTypes().size());
                    for (Type satisfiedType : refinedTP.getSatisfiedTypes()) {
                        // substitute the refined type parameter bounds with the right type arguments
                        satisfiedTypesForBounds.add(satisfiedType.substitute(supertype));
                    }
                    typeParameterForBounds = refinedTP;
                }
            }
        }
    }
    return makeTypeParameter(declarationModel.getName(), satisfiedTypesForBounds, typeParameterForBounds.isCovariant(), typeParameterForBounds.isContravariant());
}

Example 5 with TypeParameter

use of org.eclipse.ceylon.model.typechecker.model.TypeParameter in project ceylon by eclipse.

the class AbstractTransformer method getRefinedTypedReference.

private TypedReference getRefinedTypedReference(TypedReference typedReference, TypedDeclaration refinedDeclaration) {
    TypeDeclaration refinedContainer = (TypeDeclaration) refinedDeclaration.getContainer();
    Type refinedContainerType = typedReference.getQualifyingType().getSupertype(refinedContainer);
    ArrayList<Type> typeArgs = new ArrayList<Type>();
    for (TypeParameter tp : typedReference.getDeclaration().getTypeParameters()) {
        typeArgs.add(typedReference.getTypeArguments().get(tp));
    }
    return refinedDeclaration.appliedTypedReference(refinedContainerType, typeArgs);
}