8193277: SimpleFileObject inconsistency between getName and getShortName

Backport-of: 0720686

Author: cushon

src/jdk.compiler/share/classes/com/sun/tools/javac/file/PathFileObject.java

@@ -288,6 +288,11 @@ public String getName() {
             return userPath.toString();
         }
 
+        @Override @DefinedBy(Api.COMPILER)
+        public String getShortName() {
+            return userPath.getFileName().toString();
+        }
+
         @Override
         public String inferBinaryName(Iterable<? extends Path> paths) {
             Path absPath = path.toAbsolutePath();

test/langtools/tools/javac/file/SymLinkShortNameTest.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2019, Google LLC. 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 8193277
+ * @summary SimpleFileObject inconsistency between getName and getShortName
+ * @library /tools/lib
+ * @modules jdk.compiler/com.sun.tools.javac.api
+ *          jdk.compiler/com.sun.tools.javac.main
+ *          jdk.jdeps/com.sun.tools.classfile
+ * @build toolbox.JavacTask toolbox.TestRunner toolbox.ToolBox
+ * @run main SymLinkShortNameTest
+ */
+
+import java.nio.file.FileSystemException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import toolbox.JavacTask;
+import toolbox.Task.Expect;
+import toolbox.Task.OutputKind;
+import toolbox.Task.Result;
+import toolbox.TestRunner;
+import toolbox.TestRunner.Test;
+import toolbox.ToolBox;
+
+public class SymLinkShortNameTest extends TestRunner {
+    public static void main(String... args) throws Exception {
+        new SymLinkShortNameTest().runTests(m -> new Object[] {Paths.get(m.getName())});
+    }
+
+    private final ToolBox tb = new ToolBox();
+
+    public SymLinkShortNameTest() {
+        super(System.err);
+    }
+
+    @Test
+    public void testJarSymlink(Path base) throws Exception {
+        Files.createDirectories(base);
+        Path b = base.resolve("B.java");
+        tb.writeFile(b, "class B { int f() {} }");
+
+        Path a = base.resolve("A.java");
+        try {
+            Files.createSymbolicLink(a, b.getFileName());
+        } catch (FileSystemException fse) {
+            System.err.println("warning: test passes vacuously, sym-link could not be created");
+            System.err.println(fse.getMessage());
+            return;
+        }
+
+        {
+            Result result =
+                    new JavacTask(tb).options("-XDrawDiagnostics").files(a).run(Expect.FAIL);
+            String output = result.getOutput(OutputKind.DIRECT);
+
+            String expected = "A.java:1:20: compiler.err.missing.ret.stmt";
+            if (!output.contains(expected)) {
+                throw new AssertionError(
+                        "expected output to contain: " + expected + "\nwas:\n" + output);
+            }
+        }
+        {
+            Result result = new JavacTask(tb).files(a).run(Expect.FAIL);
+            String output = result.getOutput(OutputKind.DIRECT);
+
+            String expected = "A.java:1: error: missing return statement";
+            if (!output.contains(expected)) {
+                throw new AssertionError(
+                        "expected output to contain: " + expected + "\nwas:\n" + output);
+            }
+        }
+    }
+}