8295322: Tests for JDK-8271459 were not backported to 11u

Co-authored-by: Christian Hagedorn <chagedorn@openjdk.org>
Reviewed-by: phh

test/hotspot/jtreg/compiler/c2/TestNegativeStringBuilderCapacity.java

@@ -0,0 +1,187 @@
+/*
+ * Copyright (c) 2022, 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.
+ */
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+/*
+ * @test
+ * @bug 8271459
+ * @requires vm.compiler2.enabled
+ * @summary C2 applies string opts to StringBuilder object created with a negative size and misses the NegativeArraySizeException.
+ * @run testng TestNegativeStringBuilderCapacity
+ */
+class TestNegativeStringBuilderCapacity {
+
+    static final int pass_count = 10000;
+
+    static final String doIdenticalPositiveConst() throws Throwable {
+        // C2 knows that argument is 5 and applies string opts without runtime check.
+        StringBuilder sb = new StringBuilder(5); // StringBuilder object optimized away by string opts.
+        return sb.toString(); // Call optimized away by string opts.
+    }
+
+    @Test
+    static final void testIdenticalPositiveConst() {
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doIdenticalPositiveConst();
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, 0, String.format("%d exception were thrown, 0 expected", throw_count));
+    }
+
+    static final String doIdenticalNegativeConst() throws Throwable {
+        // C2 knows that we always have a negative int -> bail out of string opts
+        StringBuilder sb = new StringBuilder(-5);
+        return sb.toString(); // Call stays due to bailout.
+    }
+
+    @Test
+    static final void testIdenticalNegativeConst() {
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doIdenticalNegativeConst();
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, pass_count, String.format("%d exception were thrown, %d expected", throw_count, pass_count));
+    }
+
+    static int aField;
+
+    static final String doField() throws Throwable {
+        // C2 does not know if iFld is positive or negative. It applies string opts but inserts a runtime check to
+        // bail out to interpreter
+        StringBuilder sb = new StringBuilder(aField);
+        return sb.toString();
+    }
+
+    @Test
+    static final void testPositiveField() {
+        aField = 4;
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doField();
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, 0, String.format("%d exception were thrown, 0 expected", throw_count));
+    }
+
+    @Test
+    static final void testNegativeField() {
+        aField = -4;
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doField();
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, pass_count, String.format("%d exception were thrown, %d expected", throw_count, pass_count));
+    }
+
+    static final String doPossiblyNegativeConst(boolean flag) throws Throwable {
+        // C2 knows that cap is between -5 and 5. It applies string opts but inserts a runtime check to
+        // bail out to interpreter. This path is sometimes taken and sometimes not.
+        final int capacity = flag ? 5 : -5;
+        StringBuilder sb = new StringBuilder(capacity);
+        return sb.toString();
+    }
+
+    @Test
+    static final void testPossiblyNegativeConst() {
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doPossiblyNegativeConst((pass % 2) == 0);
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, pass_count/2, String.format("%d exception were thrown, %d expected", throw_count, pass_count/2));
+    }
+
+    static final String doPositiveConst(boolean flag) throws Throwable {
+        // C2 knows that cap is between 1 and 100 and applies string opts without runtime check.
+        final int capacity = flag ? 1 : 100;
+        StringBuilder sb = new StringBuilder(capacity);
+        return sb.toString();
+    }
+
+    @Test
+    static final void testPositiveConst() {
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doPositiveConst((pass % 2) == 0);
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, 0, String.format("%d exception were thrown, 0 expected", throw_count));
+    }
+
+    static final String doArg(int capacity) throws Throwable {
+        // C2 does not know if cap is positive or negative. It applies string opts but inserts a runtime check to
+        // bail out to interpreter. This path is always taken because cap is always negative.
+        StringBuilder sb = new StringBuilder(capacity);
+        return sb.toString();
+    }
+
+    @Test
+    static final void testArg() {
+        int throw_count = 0;
+        for ( int pass = 0; pass < pass_count; pass++ ) {
+            try {
+                String s = doArg((pass % 2) == 0 ? 3 : -3 );
+            } catch (NegativeArraySizeException e) {
+                throw_count++;
+            } catch (Throwable e) {
+                Assert.fail("Unexpected exception thrown");
+            }
+        }
+        Assert.assertEquals( throw_count, pass_count/2, String.format("%d exception were thrown, %d expected", throw_count, pass_count/2));
+    }
+}