Examples with ClassSymbol com.sun.tools.javac.code.Symbol.ClassSymbol used on opensource projects

Example 6 with ClassSymbol

use of com.sun.tools.javac.code.Symbol.ClassSymbol in project error-prone by google.

the class ImmutableEnumChecker method matchClass.

@Override
public Description matchClass(ClassTree tree, VisitorState state) {
    ClassSymbol symbol = getSymbol(tree);
    if (symbol == null || !symbol.isEnum()) {
        return NO_MATCH;
    }
    if (ASTHelpers.hasAnnotation(symbol, Immutable.class, state) && !implementsImmutableInterface(symbol)) {
        AnnotationTree annotation = ASTHelpers.getAnnotationWithSimpleName(tree.getModifiers().getAnnotations(), "Immutable");
        if (annotation != null) {
            state.reportMatch(buildDescription(annotation).setMessage(ANNOTATED_ENUM_MESSAGE).addFix(SuggestedFix.delete(annotation)).build());
        } else {
            state.reportMatch(buildDescription(tree).setMessage(ANNOTATED_ENUM_MESSAGE).build());
        }
    }
    Violation info = new ImmutableAnalysis(this, state, "enums should be immutable, and cannot have non-final fields", "enums should only have immutable fields").checkForImmutability(Optional.of(tree), ImmutableSet.of(), getType(tree));
    if (!info.isPresent()) {
        return NO_MATCH;
    }
    String message = "enums should be immutable: " + info.message();
    return buildDescription(tree).setMessage(message).build();
}

Example 7 with ClassSymbol

use of com.sun.tools.javac.code.Symbol.ClassSymbol in project error-prone by google.

the class WrongParameterPackage method matchMethod.

@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
    MethodSymbol method = ASTHelpers.getSymbol(tree);
    if (method == null) {
        return Description.NO_MATCH;
    }
    ClassSymbol classSym = method.enclClass();
    if (classSym == null) {
        return Description.NO_MATCH;
    }
    TypeSymbol superClass = classSym.getSuperclass().tsym;
    if (superClass == null) {
        return Description.NO_MATCH;
    }
    for (Symbol s : superClass.members().getSymbols()) {
        if (s.name.contentEquals(method.name) && s.getKind() == ElementKind.METHOD) {
            MethodSymbol supermethod = (MethodSymbol) s;
            // if this method actually overrides the supermethod, then it's correct and not a match.
            if (method.overrides(supermethod, superClass, state.getTypes(), true)) {
                return Description.NO_MATCH;
            }
            // if this doesn't have the right number of parameters, look at other ones.
            if (supermethod.params().size() != method.params().size()) {
                continue;
            }
            for (int x = 0; x < method.params().size(); x++) {
                Type methodParamType = method.params().get(x).type;
                Type supermethodParamType = supermethod.params().get(x).type;
                if (methodParamType.tsym.name.contentEquals(supermethodParamType.tsym.name) && !state.getTypes().isSameType(methodParamType, supermethodParamType)) {
                    this.supermethod = supermethod;
                    return describe(tree, state);
                }
            }
        }
    }
    return Description.NO_MATCH;
}

Example 8 with ClassSymbol

use of com.sun.tools.javac.code.Symbol.ClassSymbol in project error-prone by google.

the class EqualsIncompatibleType method matchMethodInvocation.

@Override
public Description matchMethodInvocation(MethodInvocationTree invocationTree, final VisitorState state) {
    if (!STATIC_EQUALS_INVOCATION_MATCHER.matches(invocationTree, state) && !INSTANCE_EQUALS_INVOCATION_MATCHER.matches(invocationTree, state)) {
        return Description.NO_MATCH;
    }
    // This is the type of the object on which the java.lang.Object.equals() method
    // is called, either directly or indirectly via a static utility method. In the latter,
    // it is the type of the first argument to the static method.
    Type receiverType;
    // This is the type of the argument to the java.lang.Object.equals() method.
    // In case a static utility method is used, it is the type of the second argument
    // to this method.
    Type argumentType;
    if (STATIC_EQUALS_INVOCATION_MATCHER.matches(invocationTree, state)) {
        receiverType = ASTHelpers.getType(invocationTree.getArguments().get(0));
        argumentType = ASTHelpers.getType(invocationTree.getArguments().get(1));
    } else {
        receiverType = ASTHelpers.getReceiverType(invocationTree);
        argumentType = ASTHelpers.getType(invocationTree.getArguments().get(0));
    }
    if (receiverType == null || argumentType == null) {
        return Description.NO_MATCH;
    }
    // 1.7: java.lang.Object can be cast to primitives (implicitly through the boxed primitive type)
    if (ASTHelpers.isCastable(argumentType, receiverType, state)) {
        return Description.NO_MATCH;
    }
    // Otherwise, we explore the superclasses of the receiver type as well as the interfaces it
    // implements and we collect all overrides of java.lang.Object.equals(). If one of those
    // overrides is inherited by the argument, then we don't flag the equality test.
    final Types types = state.getTypes();
    Predicate<MethodSymbol> equalsPredicate = new Predicate<MethodSymbol>() {

        @Override
        public boolean apply(MethodSymbol methodSymbol) {
            return !methodSymbol.isStatic() && ((methodSymbol.flags() & Flags.SYNTHETIC) == 0) && types.isSameType(methodSymbol.getReturnType(), state.getSymtab().booleanType) && methodSymbol.getParameters().size() == 1 && types.isSameType(methodSymbol.getParameters().get(0).type, state.getSymtab().objectType);
        }
    };
    Name equalsName = state.getName("equals");
    Set<MethodSymbol> overridesOfEquals = ASTHelpers.findMatchingMethods(equalsName, equalsPredicate, receiverType, types);
    ClassSymbol argumentClass = (ClassSymbol) argumentType.tsym;
    for (MethodSymbol method : overridesOfEquals) {
        ClassSymbol methodClass = method.enclClass();
        if (argumentClass.isSubClass(methodClass, types) && !methodClass.equals(state.getSymtab().objectType.tsym) && !methodClass.equals(state.getSymtab().enumSym)) {
            // with the receiver that implements an override of java.lang.Object.equals().
            return Description.NO_MATCH;
        }
    }
    // assertFalse(objOfReceiverType.equals(objOfArgumentType))
    if (ASSERT_FALSE_MATCHER.matches(state.getPath().getParentPath().getLeaf(), state)) {
        return Description.NO_MATCH;
    }
    // When we reach this point, we know that the two following facts hold:
    // (1) The types of the receiver and the argument to the eventual invocation of
    //     java.lang.Object.equals() are incompatible.
    // (2) No common superclass (other than java.lang.Object) or interface of the receiver and the
    //     argument defines an override of java.lang.Object.equals().
    // This equality test almost certainly evaluates to false, which is very unlikely to be the
    // programmer's intent. Hence, this is reported as an error. There is no sensible fix to suggest
    // in this situation.
    Description.Builder description = buildDescription(invocationTree);
    description.setMessage("Calling " + ASTHelpers.getSymbol(invocationTree).getSimpleName() + " on incompatible types " + receiverType + " and " + argumentType);
    return description.build();
}

Example 9 with ClassSymbol

use of com.sun.tools.javac.code.Symbol.ClassSymbol in project error-prone by google.

the class AmbiguousMethodReference method matchClass.

@Override
public Description matchClass(ClassTree tree, VisitorState state) {
    ClassSymbol origin = getSymbol(tree);
    Types types = state.getTypes();
    Iterable<Symbol> members = types.membersClosure(getType(tree), /*skipInterface=*/
    false).getSymbols();
    // collect declared and inherited methods, grouped by reference descriptor
    Map<String, List<MethodSymbol>> methods = stream(members.spliterator(), false).filter(MethodSymbol.class::isInstance).map(MethodSymbol.class::cast).filter(m -> m.isConstructor() || m.owner.equals(origin)).collect(groupingBy(m -> methodReferenceDescriptor(types, m), toCollection(ArrayList::new)));
    // look for groups of ambiguous method references
    for (Tree member : tree.getMembers()) {
        if (!(member instanceof MethodTree)) {
            continue;
        }
        MethodSymbol msym = getSymbol((MethodTree) member);
        if (isSuppressed(msym)) {
            continue;
        }
        List<MethodSymbol> clash = methods.remove(methodReferenceDescriptor(types, msym));
        if (clash == null) {
            continue;
        }
        clash.remove(msym);
        // ignore overridden inherited methods and hidden interface methods
        clash.removeIf(m -> types.isSubSignature(msym.type, m.type));
        if (clash.isEmpty()) {
            continue;
        }
        String message = String.format("This method's reference is ambiguous, its name and functional interface type" + " are the same as: %s", clash.stream().map(m -> Signatures.prettyMethodSignature(origin, m)).collect(joining(", ")));
        state.reportMatch(buildDescription(member).setMessage(message).build());
    }
    return NO_MATCH;
}

Example 10 with ClassSymbol

use of com.sun.tools.javac.code.Symbol.ClassSymbol in project error-prone by google.

the class FindIdentifiers method isVisible.

private static boolean isVisible(VarSymbol var, final TreePath path) {
    switch(var.getKind()) {
        case ENUM_CONSTANT:
        case FIELD:
            // TODO(eaftan): Switch collector to ImmutableList.toImmutableList() when released
            List<ClassSymbol> enclosingClasses = StreamSupport.stream(path.spliterator(), false).filter(tree -> tree instanceof ClassTree).map(ClassTree.class::cast).map(ASTHelpers::getSymbol).collect(Collectors.toCollection(ArrayList::new));
            if (!var.isStatic()) {
                // Instance fields are not visible if we are in a static context...
                if (inStaticContext(path)) {
                    return false;
                }
                // the enclosing static nested class (JLS 8.5.1).
                if (lowerThan(path, (curr, unused) -> curr instanceof ClassTree && ASTHelpers.getSymbol((ClassTree) curr).isStatic(), (curr, unused) -> curr instanceof ClassTree && ASTHelpers.getSymbol((ClassTree) curr).equals(var.owner))) {
                    return false;
                }
            }
            // fields (JLS 6.6.1).
            if (enclosingClasses.contains(ASTHelpers.enclosingClass(var))) {
                return true;
            }
            PackageSymbol enclosingPackage = ((JCCompilationUnit) path.getCompilationUnit()).packge;
            Set<Modifier> modifiers = var.getModifiers();
            // (JLS 6.6.1).
            if (Objects.equals(enclosingPackage, ASTHelpers.enclosingPackage(var))) {
                return !modifiers.contains(Modifier.PRIVATE);
            }
            // in the enclosing class or a superclass).
            return modifiers.contains(Modifier.PUBLIC) || modifiers.contains(Modifier.PROTECTED);
        case PARAMETER:
        case LOCAL_VARIABLE:
            // final or effectively final (JLS 8.1.3).
            if (lowerThan(path, (curr, parent) -> curr.getKind() == Kind.LAMBDA_EXPRESSION || (curr.getKind() == Kind.NEW_CLASS && ((NewClassTree) curr).getClassBody() != null) || (curr.getKind() == Kind.CLASS && parent.getKind() == Kind.BLOCK), (curr, unused) -> Objects.equals(var.owner, ASTHelpers.getSymbol(curr)))) {
                if ((var.flags() & (Flags.FINAL | Flags.EFFECTIVELY_FINAL)) == 0) {
                    return false;
                }
            }
            return true;
        case EXCEPTION_PARAMETER:
        case RESOURCE_VARIABLE:
            return true;
        default:
            throw new IllegalArgumentException("Unexpected variable type: " + var.getKind());
    }
}