jdk8-mips64-public/langtools: test/tools/javac/lambda/LocalVariableTable.java@ba758e1ffa69 (annotated)

test/tools/javac/lambda/LocalVariableTable.java@ba758e1ffa69 (annotated)

test/tools/javac/lambda/LocalVariableTable.java

Thu, 26 Mar 2015 11:34:50 +0100

author: jlahoda
date: Thu, 26 Mar 2015 11:34:50 +0100
changeset 2734: ba758e1ffa69
parent 0: 959103a6100f
permissions: -rw-r--r--

8054220: Debugger doesn't show variables *outside* lambda
8058227: Debugger has no access to outer variables inside Lambda
Summary: Put local variables captured by lambda into the lambda method's LocalVariableTable.
Reviewed-by: mcimadamore, rfield

 /*
  * 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);
                 }
             };
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javac/lambda/LocalVariableTable.java@ba758e1ffa69 (annotated)

test/tools/javac/lambda/LocalVariableTable.java