1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package com.sun.tools.sjavac.comp.dependencies;

    26 

    27 import java.util.HashSet;

    28 import java.util.Set;

    29 

    30 import com.sun.tools.javac.code.Symbol;

    31 import com.sun.tools.javac.code.Symbol.ClassSymbol;

    32 import com.sun.tools.javac.code.Symbol.PackageSymbol;

    33 import com.sun.tools.javac.code.Type;

    34 import com.sun.tools.javac.code.TypeTag;

    35 import com.sun.tools.javac.tree.JCTree.JCFieldAccess;

    36 import com.sun.tools.javac.tree.JCTree.JCIdent;

    37 import com.sun.tools.javac.tree.TreeScanner;

    38 

    39 class DependencyScanner extends TreeScanner {

    40 

    41     public final Set<Dependency> dependencies = new HashSet<>();

    42 

    43     private boolean isValidDependency(Type t) {

    44         if (t == null || t.isPrimitiveOrVoid() || t.isErroneous())

    45             return false;

    46         TypeTag tag = t.getTag();

    47         return tag != TypeTag.PACKAGE

    48             && tag != TypeTag.METHOD

    49             && tag != TypeTag.ARRAY

    50             && tag != TypeTag.TYPEVAR;

    51     }

    52 

    53     @Override

    54     public void visitIdent(JCIdent tree) {

    55         if (isValidDependency(tree.type))

    56             dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym));

    57         super.visitIdent(tree);

    58     }

    59 

    60     @Override

    61     public void visitSelect(JCFieldAccess tree) {

    62         if (tree.getIdentifier().contentEquals("*")) {

    63             Symbol sym = tree.selected instanceof JCIdent ? ((JCIdent) tree.selected).sym

    64                                                           : ((JCFieldAccess) tree.selected).sym;

    65             if (sym instanceof ClassSymbol) {

    66                 ClassSymbol clsSym = (ClassSymbol) sym;

    67                 dependencies.add(new TypeAndSupertypesDependency(clsSym.type.tsym));

    68             } else {

    69                 dependencies.add(new PackageDependency((PackageSymbol) sym));

    70             }

    71         } else if (tree.type != null && tree.type.hasTag(TypeTag.METHOD)) {  // Method call? Depend on the result (even though we never access it elsewhere)

    72             Type retType = tree.type.getReturnType();

    73             if (isValidDependency(retType))

    74                 dependencies.add(new TypeAndSupertypesDependency(retType.tsym));

    75         } else if (isValidDependency(tree.type)) {

    76             dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym));

    77         }

    78         super.visitSelect(tree);

    79     }

    80 

    81     public Set<Dependency> getResult() {

    82         return dependencies;

    83     }

    84 }