6911256: Project Coin: Support Automatic Resource Management (ARM) blocks in the compiler

6964740: Project Coin: More tests for ARM compiler changes
6965277: Project Coin: Correctness issues in ARM implementation
6967065: add -Xlint warning category for Automatic Resource Management (ARM)

Reviewed-by: jjb, darcy, mcimadamore, jjg, briangoetz

langtools/test/tools/javac/TryWithResources/DuplicateResource.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2010, 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 6911256 6964740 6965277
+ * @author Maurizio Cimadamore
+ * @summary Check that lowered arm block does not end up creating resource twice
+ */
+
+import java.util.ArrayList;
+
+public class DuplicateResource {
+
+    static class TestResource implements AutoCloseable {
+        TestResource() {
+            resources.add(this);
+        }
+        boolean isClosed = false;
+        public void close() throws Exception {
+            isClosed = true;
+        }
+    }
+
+    static ArrayList<TestResource> resources = new ArrayList<TestResource>();
+
+    public static void main(String[] args) {
+        try(new TestResource()) {
+           //do something
+        } catch (Exception e) {
+            throw new AssertionError("Shouldn't reach here", e);
+        }
+        check();
+    }
+
+    public static void check() {
+       if (resources.size() != 1) {
+           throw new AssertionError("Expected one resource, found: " + resources.size());
+       }
+       TestResource resource = resources.get(0);
+       if (!resource.isClosed) {
+           throw new AssertionError("Resource used in ARM block has not been automatically closed");
+       }
+    }
+}