jdk-24/test/langtools/tools/javac/T8022186/DeadCodeGeneratedForEmptyTryTest.java
2024-05-24 15:58:34 +00:00

177 lines
5.6 KiB
Java

/*
* Copyright (c) 2013, 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 8022186 8271254
* @summary javac generates dead code if a try with an empty body has a finalizer
* @enablePreview
* @modules java.base/jdk.internal.classfile.impl
* jdk.compiler/com.sun.tools.javac.util
*/
import java.lang.classfile.*;
import java.lang.classfile.attribute.CodeAttribute;
import java.lang.classfile.constantpool.*;
import java.lang.classfile.instruction.InvokeInstruction;
import com.sun.tools.javac.util.Assert;
import java.io.BufferedInputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class DeadCodeGeneratedForEmptyTryTest {
public static void main(String[] args) throws Exception {
new DeadCodeGeneratedForEmptyTryTest().run();
}
void run() throws Exception {
for (int i = 1; i <= 8; i++) {
checkClassFile(Paths.get(System.getProperty("test.classes"),
this.getClass().getName() + "$Test" + i + ".class"));
}
}
int utf8Index;
int numberOfRefToStr = 0;
ConstantPool constantPool;
void checkClassFile(final Path path) throws Exception {
numberOfRefToStr = 0;
ClassModel classFile = ClassFile.of().parse(
new BufferedInputStream(Files.newInputStream(path)).readAllBytes());
constantPool = classFile.constantPool();
for (MethodModel method: classFile.methods()) {
if (method.methodName().equalsString("methodToLookFor")) {
CodeAttribute codeAtt = method.findAttribute(Attributes.code()).orElseThrow();
codeAtt.elementList().stream()
.filter(ce -> ce instanceof Instruction)
.forEach(ins -> checkIndirectRefToString((Instruction) ins));
}
}
Assert.check(numberOfRefToStr == 1,
"There should only be one reference to a CONSTANT_String_info structure in the generated code");
}
void checkIndirectRefToString(Instruction instruction) {
if (instruction instanceof InvokeInstruction invokeInstruction) {
MemberRefEntry refEntry = invokeInstruction.method();
if (constantPool.entryByIndex(refEntry.type().index()) instanceof Utf8Entry) {
numberOfRefToStr++;
}
}
}
public class Test1 {
void methodToLookFor() {
try {
// empty intentionally
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test2 {
void methodToLookFor() {
try {
// empty intentionally
} catch (Exception e) {
System.out.println("EXCEPTION");
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test3 {
void methodToLookFor() {
try {
; // skip statement intentionally
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test4 {
void methodToLookFor() {
try {
; // skip statement intentionally
} catch (Exception e) {
System.out.println("EXCEPTION");
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test5 {
void methodToLookFor() {
try {
// empty try statement
try { } finally { }
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test6 {
void methodToLookFor() {
try {
// empty try statement
try { } catch (Exception e) { } finally { }
} catch (Exception e) {
System.out.println("EXCEPTION");
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test7 {
void methodToLookFor() {
try {
// empty try statement with skip statement
try { ; } finally { }
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
public class Test8 {
void methodToLookFor() {
try {
// empty try statement with skip statement
try { ; } catch (Exception e) { } finally { }
} catch (Exception e) {
System.out.println("EXCEPTION");
} finally {
System.out.println("STR_TO_LOOK_FOR");
}
}
}
}