8013576: Add stat support to LambdaToMethod

LambdaToMethod should emit info to help diagnose/test lambda metafactory problems

Reviewed-by: jjg, vromero

langtools/test/tools/javac/lambda/TestLambdaToMethodStats.java

@@ -0,0 +1,192 @@
+/*
+ * 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 8013576
+ * @summary Add stat support to LambdaToMethod
+ * @library ../lib
+ * @build JavacTestingAbstractThreadedTest
+ * @run main/othervm TestLambdaToMethodStats
+ */
+
+// use /othervm to avoid jtreg timeout issues (CODETOOLS-7900047)
+// see JDK-8006746
+
+import java.net.URI;
+import java.util.Arrays;
+
+import javax.tools.Diagnostic;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+
+import com.sun.source.util.JavacTask;
+import com.sun.tools.javac.api.ClientCodeWrapper;
+import com.sun.tools.javac.util.JCDiagnostic;
+
+public class TestLambdaToMethodStats
+    extends JavacTestingAbstractThreadedTest
+    implements Runnable {
+
+    enum ExprKind {
+        LAMBDA("()->null"),
+        MREF1("this::g"),
+        MREF2("this::h");
+
+        String exprStr;
+
+        ExprKind(String exprStr) {
+            this.exprStr = exprStr;
+        }
+    }
+
+    enum TargetKind {
+        IMPLICIT(""),
+        SERIALIZABLE("(A & java.io.Serializable)");
+
+        String targetStr;
+
+        TargetKind(String targetStr) {
+            this.targetStr = targetStr;
+        }
+    }
+
+    public static void main(String... args) throws Exception {
+        for (ExprKind ek : ExprKind.values()) {
+            for (TargetKind tk : TargetKind.values()) {
+                pool.execute(new TestLambdaToMethodStats(ek, tk));
+            }
+        }
+
+        checkAfterExec(true);
+    }
+
+    ExprKind ek;
+    TargetKind tk;
+    JavaSource source;
+    DiagnosticChecker diagChecker;
+
+
+    TestLambdaToMethodStats(ExprKind ek, TargetKind tk) {
+        this.ek = ek;
+        this.tk = tk;
+        this.source = new JavaSource();
+        this.diagChecker = new DiagnosticChecker();
+    }
+
+    class JavaSource extends SimpleJavaFileObject {
+
+        String template = "interface A {\n" +
+                          "   Object o();\n" +
+                          "}\n" +
+                          "class Test {\n" +
+                          "   A a = #C#E;\n" +
+                          "   Object g() { return null; }\n" +
+                          "   Object h(Object... o) { return null; }\n" +
+                          "}";
+
+        String source;
+
+        public JavaSource() {
+            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
+            source = template.replaceAll("#E", ek.exprStr)
+                    .replaceAll("#C", tk.targetStr);
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return source;
+        }
+    }
+
+    public void run() {
+        JavacTask ct = (JavacTask)comp.getTask(null, fm.get(), diagChecker,
+                Arrays.asList("-XDdumpLambdaToMethodStats"),
+                null, Arrays.asList(source));
+        try {
+            ct.generate();
+        } catch (Throwable ex) {
+            throw new
+                AssertionError("Error thron when analyzing the following source:\n" +
+                    source.getCharContent(true));
+        }
+        check();
+    }
+
+    void check() {
+        checkCount.incrementAndGet();
+
+        boolean error = diagChecker.lambda !=
+                (ek == ExprKind.LAMBDA);
+
+        error |= diagChecker.bridge !=
+                (ek == ExprKind.MREF2);
+
+        error |= diagChecker.altMetafactory !=
+                (tk == TargetKind.SERIALIZABLE);
+
+        if (error) {
+            throw new AssertionError("Bad stat diagnostic found for source\n" +
+                    "lambda = " + diagChecker.lambda + "\n" +
+                    "bridge = " + diagChecker.bridge + "\n" +
+                    "altMF = " + diagChecker.altMetafactory + "\n" +
+                    source.source);
+        }
+    }
+
+    static class DiagnosticChecker
+        implements javax.tools.DiagnosticListener<JavaFileObject> {
+
+        boolean altMetafactory;
+        boolean bridge;
+        boolean lambda;
+
+        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
+            try {
+                if (diagnostic.getKind() == Diagnostic.Kind.NOTE) {
+                    switch (diagnostic.getCode()) {
+                        case "compiler.note.lambda.stat":
+                            lambda = true;
+                            break;
+                        case "compiler.note.mref.stat":
+                            lambda = false;
+                            bridge = false;
+                            break;
+                        case "compiler.note.mref.stat.1":
+                            lambda = false;
+                            bridge = true;
+                            break;
+                        default:
+                            throw new AssertionError("unexpected note: " + diagnostic.getCode());
+                    }
+                    ClientCodeWrapper.DiagnosticSourceUnwrapper dsu =
+                        (ClientCodeWrapper.DiagnosticSourceUnwrapper)diagnostic;
+                    altMetafactory = (Boolean)dsu.d.getArgs()[0];
+                }
+            } catch (RuntimeException t) {
+                t.printStackTrace();
+                throw t;
+            }
+        }
+    }
+}