jlahoda@2413: /*
jlahoda@2413:  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
jlahoda@2413:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jlahoda@2413:  *
jlahoda@2413:  * This code is free software; you can redistribute it and/or modify it
jlahoda@2413:  * under the terms of the GNU General Public License version 2 only, as
jlahoda@2413:  * published by the Free Software Foundation.
jlahoda@2413:  *
jlahoda@2413:  * This code is distributed in the hope that it will be useful, but WITHOUT
jlahoda@2413:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jlahoda@2413:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jlahoda@2413:  * version 2 for more details (a copy is included in the LICENSE file that
jlahoda@2413:  * accompanied this code).
jlahoda@2413:  *
jlahoda@2413:  * You should have received a copy of the GNU General Public License version
jlahoda@2413:  * 2 along with this work; if not, write to the Free Software Foundation,
jlahoda@2413:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jlahoda@2413:  *
jlahoda@2413:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jlahoda@2413:  * or visit www.oracle.com if you need additional information or have any
jlahoda@2413:  * questions.
jlahoda@2413:  */
jlahoda@2413: 
jlahoda@2413: /*
jlahoda@2413:  * @test
jlahoda@2413:  * @bug 8029800
jlahoda@2413:  * @summary String.toLowerCase()/toUpperCase is generally dangerous, check it is not used in langtools
jlahoda@2413:  */
jlahoda@2413: 
jlahoda@2413: import java.io.*;
jlahoda@2413: import java.util.*;
jlahoda@2413: import javax.tools.*;
jlahoda@2413: import com.sun.tools.classfile.*;
jlahoda@2413: import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
jlahoda@2413: 
jlahoda@2413: public class NoStringToLower {
jlahoda@2413:     public static void main(String... args) throws Exception {
jlahoda@2413:         NoStringToLower c = new NoStringToLower();
jlahoda@2413:         if (c.run(args))
jlahoda@2413:             return;
jlahoda@2413: 
jlahoda@2413:         if (is_jtreg())
jlahoda@2413:             throw new Exception(c.errors + " errors occurred");
jlahoda@2413:         else
jlahoda@2413:             System.exit(1);
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     static boolean is_jtreg() {
jlahoda@2413:         return (System.getProperty("test.src") != null);
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     /**
jlahoda@2413:      * Main entry point.
jlahoda@2413:      */
jlahoda@2413:     boolean run(String... args) throws Exception {
jlahoda@2413:         JavaCompiler c = ToolProvider.getSystemJavaCompiler();
jlahoda@2413:         JavaFileManager fm = c.getStandardFileManager(null, null, null);
jlahoda@2413:         JavaFileManager.Location javacLoc = findJavacLocation(fm);
jlahoda@2413:         String[] pkgs = {
jlahoda@2413:             "javax.annotation.processing",
jlahoda@2413:             "javax.lang.model",
jlahoda@2413:             "javax.tools",
jlahoda@2413:             "com.sun.source",
emc@2414:             "com.sun.tools.classfile",
emc@2414:             "com.sun.tools.doclet",
emc@2414:             "com.sun.tools.doclint",
emc@2414:             "com.sun.tools.javac",
emc@2414:             "com.sun.tools.javadoc",
emc@2414:             "com.sun.tools.javah",
emc@2414:             "com.sun.tools.javap",
emc@2414:             "com.sun.tools.jdeps",
emc@2414:             "com.sun.tools.sjavac"
jlahoda@2413:         };
jlahoda@2413:         for (String pkg: pkgs) {
jlahoda@2413:             for (JavaFileObject fo: fm.list(javacLoc,
jlahoda@2413:                     pkg, EnumSet.of(JavaFileObject.Kind.CLASS), true)) {
jlahoda@2413:                 scan(fo);
jlahoda@2413:             }
jlahoda@2413:         }
jlahoda@2413: 
jlahoda@2413:         return (errors == 0);
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     // depending on how the test is run, javac may be on bootclasspath or classpath
jlahoda@2413:     JavaFileManager.Location findJavacLocation(JavaFileManager fm) {
jlahoda@2413:         JavaFileManager.Location[] locns =
jlahoda@2413:             { StandardLocation.PLATFORM_CLASS_PATH, StandardLocation.CLASS_PATH };
jlahoda@2413:         try {
jlahoda@2413:             for (JavaFileManager.Location l: locns) {
jlahoda@2413:                 JavaFileObject fo = fm.getJavaFileForInput(l,
jlahoda@2413:                     "com.sun.tools.javac.Main", JavaFileObject.Kind.CLASS);
jlahoda@2413:                 if (fo != null)
jlahoda@2413:                     return l;
jlahoda@2413:             }
jlahoda@2413:         } catch (IOException e) {
jlahoda@2413:             throw new Error(e);
jlahoda@2413:         }
jlahoda@2413:         throw new IllegalStateException("Cannot find javac");
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     /**
jlahoda@2413:      * Verify there are no references to String.toLowerCase() in a class file.
jlahoda@2413:      */
jlahoda@2413:     void scan(JavaFileObject fo) throws IOException {
jlahoda@2413:         InputStream in = fo.openInputStream();
jlahoda@2413:         try {
jlahoda@2413:             ClassFile cf = ClassFile.read(in);
jlahoda@2413:             for (ConstantPool.CPInfo cpinfo: cf.constant_pool.entries()) {
jlahoda@2413:                 if (cpinfo.getTag() == ConstantPool.CONSTANT_Methodref) {
jlahoda@2413:                     CONSTANT_Methodref_info ref = (CONSTANT_Methodref_info) cpinfo;
jlahoda@2413:                     String methodDesc = ref.getClassInfo().getName() + "." + ref.getNameAndTypeInfo().getName() + ":" + ref.getNameAndTypeInfo().getType();
jlahoda@2413: 
jlahoda@2413:                     if ("java/lang/String.toLowerCase:()Ljava/lang/String;".equals(methodDesc)) {
jlahoda@2413:                         error("found reference to String.toLowerCase() in: " + fo.getName());
jlahoda@2413:                     }
jlahoda@2413:                     if ("java/lang/String.toUpperCase:()Ljava/lang/String;".equals(methodDesc)) {
jlahoda@2413:                         error("found reference to String.toLowerCase() in: " + fo.getName());
jlahoda@2413:                     }
jlahoda@2413:                 }
jlahoda@2413:             }
jlahoda@2413:         } catch (ConstantPoolException ignore) {
jlahoda@2413:         } finally {
jlahoda@2413:             in.close();
jlahoda@2413:         }
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     /**
jlahoda@2413:      * Report an error.
jlahoda@2413:      */
jlahoda@2413:     void error(String msg) {
jlahoda@2413:         System.err.println("Error: " + msg);
jlahoda@2413:         errors++;
jlahoda@2413:     }
jlahoda@2413: 
jlahoda@2413:     int errors;
jlahoda@2413: }