Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * questions.

  */

 /*

  * @test

  * @bug 7023233

  * @summary False positive for -Xlint:try with nested try with resources blocks

  */

 import com.sun.source.util.JavacTask;

 import com.sun.tools.javac.api.ClientCodeWrapper;

 import com.sun.tools.javac.api.JavacTool;

 import com.sun.tools.javac.util.JCDiagnostic;

 import java.net.URI;

 import java.util.Arrays;

 import javax.tools.Diagnostic;

 import javax.tools.JavaCompiler;

 import javax.tools.JavaFileObject;

 import javax.tools.SimpleJavaFileObject;

 import javax.tools.StandardJavaFileManager;

 import javax.tools.ToolProvider;

 public class UnusedResourcesTest {

     enum XlintOption {

         NONE("none"),

         TRY("try");

         String opt;

         XlintOption(String opt) {

             this.opt = opt;

         }

         String getXlintOption() {

             return "-Xlint:" + opt;

         }

     }

     enum TwrStmt {

         TWR1("res1"),

         TWR2("res2"),

         TWR3("res3");

         final String resourceName;

         private TwrStmt(String resourceName) {

             this.resourceName = resourceName;

         }

     }

     enum SuppressLevel {

         NONE,

         SUPPRESS;

         String getSuppressAnno() {

             return this == SUPPRESS ?

                 "@SuppressWarnings(\"try\")" :

                 "";

         }

     }

     enum ResourceUsage {

         NONE(null),

         USE_R1(TwrStmt.TWR1),

         USE_R2(TwrStmt.TWR2),

         USE_R3(TwrStmt.TWR3);

         TwrStmt stmt;

         private ResourceUsage(TwrStmt stmt) {

             this.stmt = stmt;

         }

         String usedResourceName() {

             return stmt != null ? stmt.resourceName : null;

         }

         boolean isUsedIn(TwrStmt res, TwrStmt stmt) {

             return this.stmt == res &&

                     stmt.ordinal() >= this.stmt.ordinal();

         }

         String getUsage(TwrStmt stmt) {

             return this != NONE && stmt.ordinal() >= this.stmt.ordinal() ?

                 "use(" + usedResourceName() + ");" :

                 "";

         }

     }

     static class JavaSource extends SimpleJavaFileObject {

         String template = "class Resource implements AutoCloseable {\n" +

                               "public void close() {}\n" +

                           "}\n" +

                           "class Test {\n" +

                               "void use(Resource r) {}\n" +

                               "#S void test() {\n" +

                                  "try (Resource #R1 = new Resource()) {\n" +

                                     "#U1_R1\n" +

                                     "#U1_R2\n" +

                                     "#U1_R3\n" +

                                     "try (Resource #R2 = new Resource()) {\n" +

                                        "#U2_R1\n" +

                                        "#U2_R2\n" +

                                        "#U2_R3\n" +

                                        "try (Resource #R3 = new Resource()) {\n" +

                                            "#U3_R1\n" +

                                            "#U3_R2\n" +

                                            "#U3_R3\n" +

                                        "}\n" +

                                     "}\n" +

                                  "}\n" +

                               "}\n" +

                           "}\n";

         String source;

         public JavaSource(SuppressLevel suppressLevel, ResourceUsage usage1,

                 ResourceUsage usage2, ResourceUsage usage3) {

             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

             source = template.replace("#S", suppressLevel.getSuppressAnno()).

                     replace("#R1", TwrStmt.TWR1.resourceName).

                     replace("#R2", TwrStmt.TWR2.resourceName).

                     replace("#R3", TwrStmt.TWR3.resourceName).

                     replace("#U1_R1", usage1.getUsage(TwrStmt.TWR1)).

                     replace("#U1_R2", usage2.getUsage(TwrStmt.TWR1)).

                     replace("#U1_R3", usage3.getUsage(TwrStmt.TWR1)).

                     replace("#U2_R1", usage1.getUsage(TwrStmt.TWR2)).

                     replace("#U2_R2", usage2.getUsage(TwrStmt.TWR2)).

                     replace("#U2_R3", usage3.getUsage(TwrStmt.TWR2)).

                     replace("#U3_R1", usage1.getUsage(TwrStmt.TWR3)).

                     replace("#U3_R2", usage2.getUsage(TwrStmt.TWR3)).

                     replace("#U3_R3", usage3.getUsage(TwrStmt.TWR3));

         }

         @Override

         public CharSequence getCharContent(boolean ignoreEncodingErrors) {

             return source;

         }

     }

     public static void main(String... args) throws Exception {

         for (XlintOption xlint : XlintOption.values()) {

             for (SuppressLevel suppressLevel : SuppressLevel.values()) {

                 for (ResourceUsage usage1 : ResourceUsage.values()) {

                     for (ResourceUsage usage2 : ResourceUsage.values()) {

                         for (ResourceUsage usage3 : ResourceUsage.values()) {

                                 test(xlint,

                                         suppressLevel,

                                         usage1,

                                         usage2,

                                         usage3);

                         }

                     }

                 }

             }

         }

     }

     // Create a single file manager and reuse it for each compile to save time.

     static StandardJavaFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);

     static void test(XlintOption xlint, SuppressLevel suppressLevel, ResourceUsage usage1,

                 ResourceUsage usage2, ResourceUsage usage3) throws Exception {

         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

         JavaSource source = new JavaSource(suppressLevel, usage1, usage2, usage3);

         DiagnosticChecker dc = new DiagnosticChecker();

         JavacTask ct = (JavacTask)tool.getTask(null, fm, dc,

                 Arrays.asList(xlint.getXlintOption()), null, Arrays.asList(source));

         ct.analyze();

         check(source, xlint, suppressLevel, usage1, usage2, usage3, dc);

     }

     static void check(JavaSource source, XlintOption xlint, SuppressLevel suppressLevel,

                 ResourceUsage usage1, ResourceUsage usage2, ResourceUsage usage3, DiagnosticChecker dc) {

         ResourceUsage[] usages = { usage1, usage2, usage3 };

         boolean[] unusedFound = { dc.unused_r1, dc.unused_r2, dc.unused_r3 };

         boolean[] usedResources = { false, false, false };

         for (TwrStmt res : TwrStmt.values()) {

             outer: for (TwrStmt stmt : TwrStmt.values()) {

                 for (ResourceUsage usage : usages) {

                     if (usage.isUsedIn(res, stmt)) {

                         usedResources[res.ordinal()] = true;

                         break outer;

                     }

                 }

             }

         }

         for (TwrStmt stmt : TwrStmt.values()) {

             boolean unused = !usedResources[stmt.ordinal()] &&

                     xlint == XlintOption.TRY &&

                     suppressLevel != SuppressLevel.SUPPRESS;

             if (unused != unusedFound[stmt.ordinal()]) {

                 throw new Error("invalid diagnostics for source:\n" +

                     source.getCharContent(true) +

                     "\nOptions: " + xlint.getXlintOption() +

                     "\nFound unused res1: " + unusedFound[0] +

                     "\nFound unused res2: " + unusedFound[1] +

                     "\nFound unused res3: " + unusedFound[2] +

                     "\nExpected unused res1: " + !usedResources[0] +

                     "\nExpected unused res2: " + !usedResources[1] +

                     "\nExpected unused res3: " + !usedResources[2]);

             }

         }

     }

     static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

         boolean unused_r1 = false;

         boolean unused_r2 = false;

         boolean unused_r3 = false;

         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

             if (diagnostic.getKind() == Diagnostic.Kind.WARNING &&

                     diagnostic.getCode().contains("try.resource.not.referenced")) {

                 String varName = unwrap(diagnostic).getArgs()[0].toString();

                 if (varName.equals(TwrStmt.TWR1.resourceName)) {

                     unused_r1 = true;

                 } else if (varName.equals(TwrStmt.TWR2.resourceName)) {

                     unused_r2 = true;

                 } else if (varName.equals(TwrStmt.TWR3.resourceName)) {

                     unused_r3 = true;

                 }

             }

         }

         private JCDiagnostic unwrap(Diagnostic<? extends JavaFileObject> diagnostic) {

             if (diagnostic instanceof JCDiagnostic)

                 return (JCDiagnostic) diagnostic;

             if (diagnostic instanceof ClientCodeWrapper.DiagnosticSourceUnwrapper)

                 return ((ClientCodeWrapper.DiagnosticSourceUnwrapper)diagnostic).d;

             throw new IllegalArgumentException();

         }

     }

 }