1 /*
   2  * Copyright (c) 2013, 2015, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8029800
  27  * @summary String.toLowerCase()/toUpperCase is generally dangerous, check it is not used in langtools
  28  * @modules jdk.compiler/com.sun.tools.classfile
  29  */
  30 
  31 import java.io.*;
  32 import java.util.*;
  33 import javax.tools.*;
  34 import com.sun.tools.classfile.*;
  35 import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
  36 
  37 public class NoStringToLower {
  38     public static void main(String... args) throws Exception {
  39         NoStringToLower c = new NoStringToLower();
  40         if (c.run(args))
  41             return;
  42 
  43         if (is_jtreg())
  44             throw new Exception(c.errors + " errors occurred");
  45         else
  46             System.exit(1);
  47     }
  48 
  49     static boolean is_jtreg() {
  50         return (System.getProperty("test.src") != null);
  51     }
  52 
  53     /**
  54      * Main entry point.
  55      */
  56     boolean run(String... args) throws Exception {
  57         JavaCompiler c = ToolProvider.getSystemJavaCompiler();
  58         try (JavaFileManager fm = c.getStandardFileManager(null, null, null)) {
  59             JavaFileManager.Location javacLoc = findJavacLocation(fm);
  60             String[] pkgs = {
  61                 "javax.annotation.processing",
  62                 "javax.lang.model",
  63                 "javax.tools",
  64                 "com.sun.source",
  65                 "com.sun.tools.classfile",
  66                 "com.sun.tools.doclet",
  67                 "com.sun.tools.doclint",
  68                 "com.sun.tools.javac",
  69                 "com.sun.tools.javadoc",
  70                 "com.sun.tools.javah",
  71                 "com.sun.tools.javap",
  72                 "com.sun.tools.jdeps",
  73                 "com.sun.tools.sjavac"
  74             };
  75             for (String pkg: pkgs) {
  76                 for (JavaFileObject fo: fm.list(javacLoc,
  77                         pkg, EnumSet.of(JavaFileObject.Kind.CLASS), true)) {
  78                     scan(fo);
  79                 }
  80             }
  81 
  82             return (errors == 0);
  83         }
  84     }
  85 
  86     // depending on how the test is run, javac may be on bootclasspath or classpath
  87     JavaFileManager.Location findJavacLocation(JavaFileManager fm) {
  88         JavaFileManager.Location[] locns =
  89             { StandardLocation.PLATFORM_CLASS_PATH, StandardLocation.CLASS_PATH };
  90         try {
  91             for (JavaFileManager.Location l: locns) {
  92                 JavaFileObject fo = fm.getJavaFileForInput(l,
  93                     "com.sun.tools.javac.Main", JavaFileObject.Kind.CLASS);
  94                 if (fo != null)
  95                     return l;
  96             }
  97         } catch (IOException e) {
  98             throw new Error(e);
  99         }
 100         throw new IllegalStateException("Cannot find javac");
 101     }
 102 
 103     /**
 104      * Verify there are no references to String.toLowerCase() in a class file.
 105      */
 106     void scan(JavaFileObject fo) throws IOException {
 107         InputStream in = fo.openInputStream();
 108         try {
 109             ClassFile cf = ClassFile.read(in);
 110             for (ConstantPool.CPInfo cpinfo: cf.constant_pool.entries()) {
 111                 if (cpinfo.getTag() == ConstantPool.CONSTANT_Methodref) {
 112                     CONSTANT_Methodref_info ref = (CONSTANT_Methodref_info) cpinfo;
 113                     String methodDesc = ref.getClassInfo().getName() + "." + ref.getNameAndTypeInfo().getName() + ":" + ref.getNameAndTypeInfo().getType();
 114 
 115                     if ("java/lang/String.toLowerCase:()Ljava/lang/String;".equals(methodDesc)) {
 116                         error("found reference to String.toLowerCase() in: " + fo.getName());
 117                     }
 118                     if ("java/lang/String.toUpperCase:()Ljava/lang/String;".equals(methodDesc)) {
 119                         error("found reference to String.toLowerCase() in: " + fo.getName());
 120                     }
 121                 }
 122             }
 123         } catch (ConstantPoolException ignore) {
 124         } finally {
 125             in.close();
 126         }
 127     }
 128 
 129     /**
 130      * Report an error.
 131      */
 132     void error(String msg) {
 133         System.err.println("Error: " + msg);
 134         errors++;
 135     }
 136 
 137     int errors;
 138 }