8271583: [lworld] primitive records can't be reference favoring

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

@@ -2526,7 +2526,8 @@ JCTree generateRecordMethod(JCClassDecl tree, Name name, List<VarSymbol> vars, M
                             syms.typeDescriptorType).appendList(staticArgTypes),
                     staticArgsValues, bootstrapName, name, false);
 
-            VarSymbol _this = new VarSymbol(SYNTHETIC, names._this, tree.sym.type, tree.sym);
+            Type receiverType = tree.sym.type.isPrimitiveReferenceType() ? tree.sym.type.asValueType() : tree.sym.type;
+            VarSymbol _this = new VarSymbol(SYNTHETIC, names._this, receiverType, tree.sym);
 
             JCMethodInvocation proxyCall;
             if (!isEquals) {
@@ -2610,8 +2611,9 @@ JCFieldAccess makeIndyQualifier(
                 bootstrapName, staticArgTypes, List.nil());
 
         MethodType indyType = msym.type.asMethodType();
+        Type receiverType = tree.sym.type.isPrimitiveReferenceType() ? tree.sym.type.asValueType() : tree.sym.type;
         indyType = new MethodType(
-                isStatic ? List.nil() : indyType.argtypes.prepend(tree.sym.type),
+                isStatic ? List.nil() : indyType.argtypes.prepend(receiverType),
                 indyType.restype,
                 indyType.thrown,
                 syms.methodClass

src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java

@@ -4062,6 +4062,15 @@ protected JCClassDecl recordDeclaration(JCModifiers mods, Comment dc) {
         nextToken();
         mods.flags |= Flags.RECORD;
         Name name = typeName();
+        if ((mods.flags & Flags.PRIMITIVE_CLASS) != 0) {
+            if (token.kind == DOT) {
+                final Token pastDot = S.token(1);
+                if (pastDot.kind == IDENTIFIER && pastDot.name() == names.val) {
+                    nextToken(); nextToken(); // discard .val
+                    mods.flags |= Flags.REFERENCE_FAVORING;
+                }
+            }
+        }
 
         List<JCTypeParameter> typarams = typeParametersOpt();
 
@@ -4497,6 +4506,7 @@ protected boolean isRecordStart() {
         if (token.kind == IDENTIFIER && token.name() == names.record &&
             (peekToken(TokenKind.IDENTIFIER, TokenKind.LPAREN) ||
              peekToken(TokenKind.IDENTIFIER, TokenKind.EOF) ||
+             peekToken(TokenKind.IDENTIFIER, TokenKind.DOT) ||
              peekToken(TokenKind.IDENTIFIER, TokenKind.LT))) {
             checkSourceLevel(Feature.RECORDS);
             return true;

test/langtools/tools/javac/valhalla/lworld-values/records/RefFlavoredRecord.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2021, 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 8271583
+ * @summary [lworld] primitive records can't be reference favoring
+ * @compile -XDallowWithFieldOperator RefFlavoredRecord.java
+ * @run main/othervm RefFlavoredRecord
+ */
+
+public primitive record RefFlavoredRecord.val(int theInteger, String theString) {
+    public static void main(String[] args) {
+        RefFlavoredRecord rec = RefFlavoredRecord.default;
+        if (rec != null) {
+            throw new AssertionError("Ref-favoring record .default should be null?");
+        }
+
+        if (! new RefFlavoredRecord(42, "Fortytwo").equals(new RefFlavoredRecord(42, "Fortytwo"))) {
+            throw new AssertionError("Records should be equal");
+        }
+    }
+}