8184119: Incorrect return processing for the LF editor of MethodHandles.permuteArguments

Reviewed-by: jrose, redestad, vlivanov

jdk/src/java.base/share/classes/java/lang/invoke/LambdaFormEditor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2017, 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
@@ -879,9 +879,9 @@ class LambdaFormEditor {
         System.arraycopy(lambdaForm.names, skip + outArgs, names2, skip + inTypes, bodyLength);
         int arity2 = names2.length - bodyLength;
         int result2 = lambdaForm.result;
-        if (result2 >= 0) {
+        if (result2 >= skip) {
             if (result2 < skip + outArgs) {
-                result2 = reorder[result2 - skip];
+                result2 = reorder[result2 - skip] + skip;
             } else {
                 result2 = result2 - outArgs + inTypes;
             }

jdk/test/java/lang/invoke/PermuteArgsReturnVoidTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2017, 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 8184119
+ * @summary test permutation when return value is directly derived from an argument
+ * @run testng/othervm test.java.lang.invoke.PermuteArgsReturnVoidTest
+ */
+
+
+package test.java.lang.invoke;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+
+import static java.lang.invoke.MethodHandles.dropArguments;
+import static java.lang.invoke.MethodHandles.identity;
+
+public class PermuteArgsReturnVoidTest {
+
+    static String consumeIdentity(String s, int i1, int i2) {
+        return s;
+    }
+
+    static void consumeVoid(String s, int i1, int i2) {
+    }
+
+    @Test
+    public void testReturnOnStack() throws Throwable {
+        MethodHandles.Lookup l = MethodHandles.lookup();
+
+        MethodHandle consumeIdentity = l.findStatic(
+                PermuteArgsReturnVoidTest.class, "consumeIdentity",
+                MethodType.methodType(String.class, String.class, int.class, int.class));
+        MethodHandle consumeVoid = l.findStatic(
+                PermuteArgsReturnVoidTest.class, "consumeVoid",
+                MethodType.methodType(void.class, String.class, int.class, int.class));
+
+        MethodHandle f = MethodHandles.foldArguments(consumeIdentity, consumeVoid);
+
+        MethodHandle p = MethodHandles.permuteArguments(f, MethodType.methodType(String.class, String.class, int.class, int.class), 0, 2, 1);
+
+        String s = (String) p.invoke("IN", 0, 0);
+        Assert.assertEquals(s.getClass(), String.class);
+        Assert.assertEquals(s, "IN");
+    }
+
+    @Test
+    public void testReturnFromArg() throws Throwable {
+        MethodHandles.Lookup l = MethodHandles.lookup();
+
+        MethodHandle consumeIdentity = dropArguments(
+                identity(String.class), 1, int.class, int.class);
+        MethodHandle consumeVoid = l.findStatic(
+                PermuteArgsReturnVoidTest.class, "consumeVoid",
+                MethodType.methodType(void.class, String.class, int.class, int.class));
+
+        MethodHandle f = MethodHandles.foldArguments(consumeIdentity, consumeVoid);
+
+        MethodHandle p = MethodHandles.permuteArguments(f, MethodType.methodType(String.class, String.class, int.class, int.class), 0, 2, 1);
+
+        String s = (String) p.invoke("IN", 0, 0);
+        Assert.assertEquals(s.getClass(), String.class);
+        Assert.assertEquals(s, "IN");
+    }
+}