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