jdk8-mips64-public/langtools: test/tools/javac/lambda/BadLambdaExpr.java@c09b7234cded (annotated)

test/tools/javac/lambda/BadLambdaExpr.java@c09b7234cded (annotated)

test/tools/javac/lambda/BadLambdaExpr.java

Tue, 14 May 2013 11:11:09 -0700

author: rfield
date: Tue, 14 May 2013 11:11:09 -0700
changeset 1752: c09b7234cded
parent 0: 959103a6100f
permissions: -rw-r--r--

8012556: Implement lambda methods on interfaces as static
8006140: Javac NPE compiling Lambda expression on initialization expression of static field in interface
Summary: Lambdas occurring in static contexts or those not needing instance information should be generated into static methods. This has long been the case for classes. However, as a work-around to the lack of support for statics on interfaces, interface lambda methods have been generated into default methods. For lambdas in interface static contexts (fields and static methods) this causes an NPE in javac because there is no 'this'. MethodHandles now support static methods on interfaces. This changeset allows lambda methods to be generated as static interface methods. An existing bug in Hotspot (8013875) is exposed in a test when the "-esa" flag is used. This test and another test that already exposed this bug have been marked with @ignore.
Reviewed-by: mcimadamore

 /*
  * Copyright (c) 2012, 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 8003280
  * @summary Add lambda tests
  *  compile crashes on partial lambda expressions
  */
 import com.sun.source.util.JavacTask;
 import java.net.URI;
 import java.util.Arrays;
 import javax.tools.Diagnostic;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaFileObject;
 import javax.tools.SimpleJavaFileObject;
 import javax.tools.StandardJavaFileManager;
 import javax.tools.ToolProvider;
 public class BadLambdaExpr {
     static int checkCount = 0;
     enum ParameterListKind {
         ZERO_ARY("()"),
         UNARY("(#P)"),
         TWO_ARY("(#P, #P)"),
         THREE_ARY("(#P, #P, #P)");
         String parametersTemplateStr;
         ParameterListKind(String parametersTemplateStr) {
             this.parametersTemplateStr = parametersTemplateStr;
         }
         String getParameterString(ParameterKind pk) {
             return parametersTemplateStr.replaceAll("#P", pk.parameterStr);
         }
     }
     enum ParameterKind {
         IMPLICIT("a"),
         EXPLIICT("A a");
         String parameterStr;
         ParameterKind(String parameterStr) {
             this.parameterStr = parameterStr;
         }
     }
     enum ArrowKind {
         NONE(""),
         SEMI("-"),
         FULL("->");
         String arrowStr;
         ArrowKind(String arrowStr) {
             this.arrowStr = arrowStr;
         }
     }
     enum ExprKind {
         NONE("#P#A"),
         METHOD_CALL("m(#P#A)"),
         CONSTR_CALL("new Foo(#P#A)");
         String expressionTemplate;
         ExprKind(String expressionTemplate) {
             this.expressionTemplate = expressionTemplate;
         }
         String expressionString(ParameterListKind plk, ParameterKind pk,
                 ArrowKind ak) {
             return expressionTemplate.replaceAll("#P", plk.getParameterString(pk))
                     .replaceAll("#A", ak.arrowStr);
         }
     }
     public static void main(String... args) throws Exception {
         //create default shared JavaCompiler - reused across multiple compilations
         JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
         StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);
         for (ParameterListKind plk : ParameterListKind.values()) {
             for (ParameterKind pk : ParameterKind.values()) {
                 for (ArrowKind ak : ArrowKind.values()) {
                     for (ExprKind ek : ExprKind.values()) {
                         new BadLambdaExpr(plk, pk, ak, ek).run(comp, fm);
                     }
                 }
             }
         }
         System.out.println("Total check executed: " + checkCount);
     }
     ParameterListKind plk;
     ParameterKind pk;
     ArrowKind ak;
     ExprKind ek;
     JavaSource source;
     DiagnosticChecker diagChecker;
     BadLambdaExpr(ParameterListKind plk, ParameterKind pk, ArrowKind ak, ExprKind ek) {
         this.plk = plk;
         this.pk = pk;
         this.ak = ak;
         this.ek = ek;
         this.source = new JavaSource();
         this.diagChecker = new DiagnosticChecker();
     }
     class JavaSource extends SimpleJavaFileObject {
         String template = "class Test {\n" +
                           "   SAM s = #E;\n" +
                           "}";
         String source;
         public JavaSource() {
             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
             source = template.replaceAll("#E", ek.expressionString(plk, pk, ak));
         }
         @Override
         public CharSequence getCharContent(boolean ignoreEncodingErrors) {
             return source;
         }
     }
     void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {
         JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,
                 null, null, Arrays.asList(source));
         try {
             ct.parse();
         } catch (Throwable ex) {
             throw new AssertionError("Error thron when parsing the following source:\n" + source.getCharContent(true));
         }
         check();
     }
     void check() {
         boolean errorExpected =
                 ak != ArrowKind.NONE ||
                 plk != ParameterListKind.UNARY ||
                 pk != ParameterKind.IMPLICIT;
         if (errorExpected != diagChecker.errorFound) {
             throw new Error("bad diag for source:\n" +
                 source.getCharContent(true));
         }
         checkCount++;
     }
     static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {
         boolean errorFound;
         @Override
         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
             if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
                 errorFound = true;
             }
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javac/lambda/BadLambdaExpr.java@c09b7234cded (annotated)

test/tools/javac/lambda/BadLambdaExpr.java