8335817: javac AssertionError addLocalVar checkNull

Reviewed-by: vromero, mcimadamore

src/jdk.compiler/share/classes/com/sun/tools/javac/comp/TransPatterns.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2024, 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
@@ -78,6 +78,7 @@ import com.sun.tools.javac.code.Symbol.MethodSymbol;
 import com.sun.tools.javac.code.Symbol.RecordComponent;
 import com.sun.tools.javac.code.Type;
 import static com.sun.tools.javac.code.TypeTag.BOT;
+import static com.sun.tools.javac.code.TypeTag.VOID;
 import com.sun.tools.javac.jvm.PoolConstant.LoadableConstant;
 import com.sun.tools.javac.jvm.Target;
 import com.sun.tools.javac.tree.JCTree;
@@ -1260,7 +1261,11 @@ public class TransPatterns extends TreeTranslator {
                 tree.body = translate(tree.body);
                 if (deconstructorCalls != null) {
                     if (tree.body instanceof JCExpression value) {
-                        tree.body = make.Block(0, List.of(make.Return(value)));
+                        if (value.type.hasTag(VOID)) {
+                            tree.body = make.Block(0, List.of(make.Exec(value)));
+                        } else {
+                            tree.body = make.Block(0, List.of(make.Return(value)));
+                        }
                     }
                     if (tree.body instanceof JCBlock block) {
                         preparePatternMatchingCatchIfNeeded(block);

test/langtools/tools/javac/patterns/MatchExceptionLambdaExpression.java

@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2024, 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 8335817
+ * @summary Verify synthetic catches for deconstruction patterns work properly in expression lambdas
+ * @compile MatchExceptionLambdaExpression.java
+ * @run main MatchExceptionLambdaExpression
+ */
+public class MatchExceptionLambdaExpression {
+
+    public static void main(String[] args) {
+        try {
+            doRunPrimitiveVoid(new A("", true), o -> checkPrimitiveVoid(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+        try {
+            doRunPrimitiveVoid(new A("", true), o -> checkVoidBox(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+        try {
+            doRunPrimitiveVoid(new A("", true), o -> checkNonVoid(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+        try {
+            doRunVoidBox(new A("", true), o -> checkVoidBox(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+        try {
+            doRunNonVoid(new A("", true), o -> checkVoidBox(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+        try {
+            doRunNonVoid(new A("", true), o -> checkNonVoid(o instanceof A(String s, _), true));
+            throw new AssertionError("Didn't gete the expected exception!");
+        } catch (MatchException ex) {
+            if (ex.getCause() instanceof RequestedException) {
+                //correct
+            } else {
+                throw ex;
+            }
+        }
+    }
+
+    static void doRunPrimitiveVoid(Object inp, PrimitiveVoidFI toRun) {
+       toRun.run(inp);
+    }
+
+    static void doRunVoidBox(Object inp, VoidBoxFI toRun) {
+       toRun.run(inp);
+    }
+
+    static void doRunNonVoid(Object inp, NonVoidFI toRun) {
+       toRun.run(inp);
+    }
+
+    static void checkPrimitiveVoid(boolean a, boolean shouldNotBeCalled) {
+        if (shouldNotBeCalled) {
+            throw new AssertionError("Should not be called.");
+        }
+    }
+
+    static Void checkVoidBox(boolean a, boolean shouldNotBeCalled) {
+        if (shouldNotBeCalled) {
+            throw new AssertionError("Should not be called.");
+        }
+        return null;
+    }
+
+    static Object checkNonVoid(boolean a, boolean shouldNotBeCalled) {
+        if (shouldNotBeCalled) {
+            throw new AssertionError("Should not be called.");
+        }
+        return null;
+    }
+
+    interface PrimitiveVoidFI {
+        public void run(Object o);
+    }
+
+    interface VoidBoxFI {
+        public Void run(Object o);
+    }
+
+    interface NonVoidFI {
+        public Object run(Object o);
+    }
+
+    record A(String s, boolean fail) {
+        public String s() {
+            if (fail) {
+                throw new RequestedException();
+            }
+            return s;
+        }
+    }
+
+    static class RequestedException extends RuntimeException {}
+}