001    /* Copyright (c) 2005-2008, Torbjorn Ekman
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    import java.util.*;
032    
033    aspect DeclareBeforeUse {
034      inh lazy int VariableDeclaration.blockIndex();
035      eq Program.getChild().blockIndex() = -1;// default value
036      eq Block.getStmt(int index).blockIndex() = index;// index in stmt list of block
037    
038      syn boolean Block.declaredBeforeUse(VariableDeclaration decl, int indexUse) =
039          decl.blockIndex() < indexUse;
040    
041      // TODO use inherited attr?
042      public int ASTNode.varChildIndex(TypeDecl t) {
043        ASTNode node = this;
044        while (node != null && node.getParent() != null && node.getParent().getParent() != t) {
045          node = node.getParent();
046        }
047        if (node == null) {
048          return -1;
049        }
050        return t.getBodyDeclListNoTransform().getIndexOfChild(node);
051      }
052    
053      public boolean TypeDecl.declaredBeforeUse(Variable decl, ASTNode use) {
054        int indexDecl = ((ASTNode) decl).varChildIndex(this);
055        int indexUse = use.varChildIndex(this);
056        return indexDecl < indexUse;
057      }
058    
059      public boolean TypeDecl.declaredBeforeUse(Variable decl, int indexUse) {
060        int indexDecl = ((ASTNode) decl).varChildIndex(this);
061        return indexDecl < indexUse;
062      }
063    }