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/*
* 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));
}
}
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