001    /* Copyright (c) 2011, Jesper Öqvist <jesper.oqvist@cs.lth.se>
002     * All rights reserved.
003     *
004     * Redistribution and use in source and binary forms, with or without
005     * modification, are permitted provided that the following conditions are met:
006     *
007     * 1. Redistributions of source code must retain the above copyright notice,
008     * this list of conditions and the following disclaimer.
009     *
010     * 2. Redistributions in binary form must reproduce the above copyright notice,
011     * this list of conditions and the following disclaimer in the documentation
012     * and/or other materials provided with the distribution.
013     *
014     * 3. Neither the name of the copyright holder nor the names of its
015     * contributors may be used to endorse or promote products derived from this
016     * software without specific prior written permission.
017     *
018     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
022     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
028     * POSSIBILITY OF SUCH DAMAGE.
029     */
030    
031    /**
032     * JLS $5.1.9
033     *
034     * Add unchecked conversion warnings to the type checking
035     * of assignments, declaration initializers and cast expressions.
036     *
037     * TODO: The unchecked conversion warning can be suppressed with
038     * the SuppressWarnings annotation.
039     */
040    aspect UncheckedConversion {
041      public void VariableDeclaration.checkWarnings() {
042        if (hasInit() && !suppressWarnings("unchecked")) {
043          checkUncheckedConversion(getInit().type(), type());
044        }
045      }
046    
047      public void FieldDeclaration.checkWarnings() {
048        if (hasInit() && !suppressWarnings("unchecked")) {
049          checkUncheckedConversion(getInit().type(), type());
050        }
051      }
052    
053      public void AssignSimpleExpr.checkWarnings() {
054        if (!withinSuppressWarnings("unchecked")) {
055          checkUncheckedConversion(getSource().type(), getDest().type());
056        }
057      }
058    
059      public void CastExpr.checkWarnings() {
060        if (!withinSuppressWarnings("unchecked")) {
061          checkUncheckedConversion(getExpr().type(), getTypeAccess().type());
062        }
063      }
064    
065      public void ASTNode.checkUncheckedConversion(TypeDecl source, TypeDecl dest) {
066        if (source.isUncheckedConversionTo(dest)) {
067          warning("unchecked conversion from raw type " + source.typeName()
068              + " to generic type " + dest.typeName());
069        }
070      }
071    
072      /**
073       * An unchecked conversion occurs when converting from a
074       * raw type G to a generic type G<T1, ..., Tn>.
075       */
076      syn boolean TypeDecl.isUncheckedConversionTo(TypeDecl dest) =
077          (!dest.isRawType()) && this.isRawType();
078    }