8327380: Add tests for Shenandoah barrier expansion optimization

Reviewed-by: roland, shade

Author: tabjy

test/hotspot/jtreg/compiler/gcbarriers/TestShenandoahBarrierExpansion.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2024 Red Hat 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.
+ */
+
+package compiler.gcbarriers;
+
+import compiler.lib.ir_framework.CompilePhase;
+import compiler.lib.ir_framework.DontInline;
+import compiler.lib.ir_framework.IR;
+import compiler.lib.ir_framework.IRNode;
+import compiler.lib.ir_framework.Test;
+import compiler.lib.ir_framework.TestFramework;
+
+/**
+ * @test
+ * @bug 8231569
+ * @summary Test that Shenandoah barriers are expanded correctly
+ * @library /test/lib /
+ * @requires vm.gc.Shenandoah
+ * @run main compiler.gcbarriers.TestShenandoahBarrierExpansion
+ */
+public class TestShenandoahBarrierExpansion {
+    public static void main(String[] args) {
+        TestFramework test = new TestFramework(TestShenandoahBarrierExpansion.class);
+        test.addFlags("-XX:+UseShenandoahGC");
+        test.start();
+    }
+
+    private static Object staticField;
+    @Test
+    @IR(failOn = IRNode.IF, phase = CompilePhase.AFTER_PARSING)
+    @IR(counts = { IRNode.IF, "2" }, phase = CompilePhase.BARRIER_EXPANSION)
+    public Object testLoadFieldObject() {
+        return staticField;
+    }
+
+    private static A staticField2 = new A();
+    @Test
+    @IR(counts = { IRNode.IF, "1" }, phase = CompilePhase.AFTER_PARSING)
+    @IR(counts = { IRNode.IF, "3" }, phase = CompilePhase.BARRIER_EXPANSION)
+    private static int testLoadObjectFieldWithNullCheck() {
+        return staticField2.intField;
+    }
+
+    private static A staticField3 = new A();
+    @Test
+    @IR(counts = { IRNode.IF, "2" }, phase = CompilePhase.AFTER_PARSING)
+    @IR(counts = { IRNode.IF, "6" }, phase = CompilePhase.BARRIER_EXPANSION)
+    private static int testLoadTwoObjectFieldsWithNullCheck() {
+        return staticField2.intField + staticField3.intField;
+    }
+
+    @Test
+    @IR(failOn = IRNode.IF, phase = CompilePhase.AFTER_PARSING)
+    @IR(counts = { IRNode.IF, "3" }, phase = CompilePhase.BARRIER_EXPANSION)
+    private static void testLoadTwoFieldObjectAndEscape() {
+        final A field2 = staticField2;
+        final A field3 = staticField3;
+        notInlined(field2, field3);
+    }
+
+    @DontInline
+    private static void notInlined(A field2, A field3) {
+        // noop
+    }
+
+    private static class A {
+        public int intField;
+    }
+}