| /* |
| * Copyright (c) 2013, 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 8025998 8026749 8054220 8058227 |
| * @summary Missing LV table in lambda bodies |
| * @compile -g LocalVariableTable.java |
| * @run main LocalVariableTable |
| */ |
| |
| import java.io.*; |
| import java.lang.annotation.*; |
| import java.util.*; |
| import com.sun.tools.classfile.*; |
| |
| /* |
| * The test checks that a LocalVariableTable attribute is generated for the |
| * method bodies representing lambda expressions, and checks that the expected |
| * set of entries is found in the attribute. |
| * |
| * Since the bug was about missing entries in the LVT, not malformed entries, |
| * the test is not intended to be a detailed test of the contents of each |
| * LocalVariableTable entry: it is assumed that if a entry is present, it |
| * will have the correct contents. |
| * |
| * The test looks for test cases represented by nested classes whose |
| * name begins with "Lambda". Each such class contains a lambda expression |
| * that will mapped into a lambda method, and because the test is compiled |
| * with -g, these methods should have a LocalVariableTable. The set of |
| * expected names in the LVT is provided in an annotation on the class for |
| * the test case. |
| */ |
| public class LocalVariableTable { |
| public static void main(String... args) throws Exception { |
| new LocalVariableTable().run(); |
| } |
| |
| void run() throws Exception { |
| // the declared classes are returned in an unspecified order, |
| // so for neatness, sort them by name before processing them |
| Class<?>[] classes = getClass().getDeclaredClasses(); |
| Arrays.sort(classes, (c1, c2) -> c1.getName().compareTo(c2.getName())); |
| |
| for (Class<?> c : classes) { |
| if (c.getSimpleName().startsWith("Lambda")) |
| check(c); |
| } |
| if (errors > 0) |
| throw new Exception(errors + " errors found"); |
| } |
| |
| /** Check an individual test case. */ |
| void check(Class<?> c) throws Exception { |
| System.err.println("Checking " + c.getSimpleName()); |
| |
| Expect expect = c.getAnnotation(Expect.class); |
| if (expect == null) { |
| error("@Expect not found for class " + c.getSimpleName()); |
| return; |
| } |
| |
| ClassFile cf = ClassFile.read(getClass().getResource(c.getName() + ".class").openStream()); |
| Method m = getLambdaMethod(cf); |
| if (m == null) { |
| error("lambda method not found"); |
| return; |
| } |
| |
| Code_attribute code = (Code_attribute) m.attributes.get(Attribute.Code); |
| if (code == null) { |
| error("Code attribute not found"); |
| return; |
| } |
| |
| LocalVariableTable_attribute lvt = |
| (LocalVariableTable_attribute) code.attributes.get(Attribute.LocalVariableTable); |
| if (lvt == null) { |
| error("LocalVariableTable attribute not found"); |
| return; |
| } |
| |
| Set<String> foundNames = new LinkedHashSet<>(); |
| for (LocalVariableTable_attribute.Entry e: lvt.local_variable_table) { |
| foundNames.add(cf.constant_pool.getUTF8Value(e.name_index)); |
| } |
| |
| Set<String> expectNames = new LinkedHashSet<>(Arrays.asList(expect.value())); |
| if (!foundNames.equals(expectNames)) { |
| Set<String> foundOnly = new LinkedHashSet<>(foundNames); |
| foundOnly.removeAll(expectNames); |
| for (String s: foundOnly) |
| error("Unexpected name found: " + s); |
| Set<String> expectOnly = new LinkedHashSet<>(expectNames); |
| expectOnly.removeAll(foundNames); |
| for (String s: expectOnly) |
| error("Expected name not found: " + s); |
| } |
| } |
| |
| /** Get a method whose name begins "lambda$...". */ |
| Method getLambdaMethod(ClassFile cf) throws ConstantPoolException { |
| for (Method m: cf.methods) { |
| if (m.getName(cf.constant_pool).startsWith("lambda$")) |
| return m; |
| } |
| return null; |
| } |
| |
| /** Report an error. */ |
| void error(String msg) { |
| System.err.println("Error: " + msg); |
| errors++; |
| } |
| |
| int errors; |
| |
| /** |
| * Annotation used to provide the set of names expected in the LVT attribute. |
| */ |
| @Retention(RetentionPolicy.RUNTIME) |
| @interface Expect { |
| String[] value(); |
| } |
| |
| /** Functional interface with nullary method. */ |
| interface Run0 { |
| public void run(); |
| } |
| |
| /** Functional interface with 1-ary method. */ |
| interface Run1 { |
| public void run(int a0); |
| } |
| |
| /** Functional interface with 2-ary method. */ |
| interface Run2 { |
| public void run(int a0, int a1); |
| } |
| |
| /* |
| * ---------- Test cases --------------------------------------------------- |
| */ |
| |
| @Expect({ "x" }) |
| static class Lambda_Args0_Local1 { |
| Run0 r = () -> { int x = 0; }; |
| } |
| |
| @Expect({ "x", "this" }) |
| static class Lambda_Args0_Local1_this { |
| int v; |
| Run0 r = () -> { int x = v; }; |
| } |
| |
| @Expect({ "a" }) |
| static class Lambda_Args1_Local0 { |
| Run1 r = (a) -> { }; |
| } |
| |
| @Expect({ "a", "x" }) |
| static class Lambda_Args1_Local1 { |
| Run1 r = (a) -> { int x = a; }; |
| } |
| |
| @Expect({ "a", "x", "v" }) |
| static class Lambda_Args1_Local1_Captured1 { |
| void m() { |
| int v = 0; |
| Run1 r = (a) -> { int x = a + v; }; |
| } |
| } |
| |
| @Expect({ "a1", "a2", "x1", "x2", "this", "v1", "v2" }) |
| static class Lambda_Args2_Local2_Captured2_this { |
| int v; |
| void m() { |
| int v1 = 0; |
| int v2 = 0; |
| Run2 r = (a1, a2) -> { |
| int x1 = a1 + v1 + v; |
| int x2 = a2 + v2 + v; |
| }; |
| } |
| } |
| |
| @Expect({ "e", "c" }) |
| static class Lambda_Try_Catch { |
| private static Runnable asUncheckedRunnable(Closeable c) { |
| return () -> { |
| try { |
| c.close(); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| }; |
| } |
| } |
| } |
| |