[GR-64732] Provide fallback VectorAPIFeature for user-friendly error message.

PullRequest: graal/20765

Author: olpaw

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/VectorAPIEnabled.java

@@ -29,9 +29,14 @@
 
 import com.oracle.svm.core.SubstrateOptions;
 
-public class VectorAPIEnabled implements BooleanSupplier {
+public final class VectorAPIEnabled implements BooleanSupplier {
+
+    public static boolean getValue() {
+        return SubstrateOptions.VectorAPISupport.getValue();
+    }
+
     @Override
     public boolean getAsBoolean() {
-        return SubstrateOptions.VectorAPISupport.getValue();
+        return getValue();
     }
 }

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/VectorAPIFeature.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2025, 2025, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package com.oracle.svm.hosted;
+
+import com.oracle.svm.core.SubstrateOptions;
+import com.oracle.svm.core.feature.AutomaticallyRegisteredFeature;
+import com.oracle.svm.core.feature.InternalFeature;
+import com.oracle.svm.core.jdk.VectorAPIEnabled;
+import com.oracle.svm.core.option.SubstrateOptionsParser;
+import com.oracle.svm.core.util.UserError;
+
+@AutomaticallyRegisteredFeature
+public class VectorAPIFeature implements InternalFeature {
+
+    @Override
+    public void afterRegistration(AfterRegistrationAccess access) {
+        if (VectorAPIEnabled.getValue()) {
+            throw UserError.abort("Option '%s' is still experimental and currently only works with Oracle GraalVM. Please use Oracle GraalVM to use it.",
+                            SubstrateOptionsParser.commandArgument(SubstrateOptions.VectorAPISupport, "+"));
+        }
+    }
+}