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/*
* Copyright (c) 2013, 2024, 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 8231827
* @summary Ensure the LV table entries are generated for bindings
* @compile -g LocalVariableTable.java
* @run main LocalVariableTable
*/
import java.lang.classfile.*;
import java.lang.classfile.attribute.*;
import java.io.*;
import java.lang.annotation.*;
import java.util.*;
/*
* The test checks that a LocalVariableTable attribute is generated for the
* method bodies containing patterns, and checks that the expected
* set of entries is found in the attribute.
*
* The test looks for test cases represented by nested classes whose
* name begins with "Pattern". Each such class contains a method
* with patterns, and because the test is compiled
* with -g, these methods should have a LocalVariableTable. The set of
* expected names in the LVT is provided in an annotation on the class for
* the test case.
*/
//Copied from: test/langtools/tools/javac/lambda/LocalVariableTable.java
public class LocalVariableTable {
public static void main(String... args) throws Exception {
new LocalVariableTable().run();
}
void run() throws Exception {
// the declared classes are returned in an unspecified order,
// so for neatness, sort them by name before processing them
Class<?>[] classes = getClass().getDeclaredClasses();
Arrays.sort(classes, (c1, c2) -> c1.getName().compareTo(c2.getName()));
for (Class<?> c : classes) {
if (c.getSimpleName().startsWith("Pattern"))
check(c);
}
if (errors > 0)
throw new Exception(errors + " errors found");
}
/** Check an individual test case. */
void check(Class<?> c) throws Exception {
System.err.println("Checking " + c.getSimpleName());
Expect expect = c.getAnnotation(Expect.class);
if (expect == null) {
error("@Expect not found for class " + c.getSimpleName());
return;
}
ClassModel cf = ClassFile.of().parse(Objects.requireNonNull(getClass().getResource(c.getName() + ".class"))
.openStream().readAllBytes());
MethodModel m = getMethodByName(cf, c.getSimpleName().contains("Lambda") ? "lambda$" : "test");
if (m == null) {
error("test method not found");
return;
}
CodeAttribute code = m.findAttribute(Attributes.code()).orElse(null);
if (code == null) {
error("Code attribute not found");
return;
}
LocalVariableTableAttribute lvt = code.findAttribute(Attributes.localVariableTable()).orElse(null);
if (lvt == null) {
error("LocalVariableTable attribute not found");
return;
}
Set<String> foundNames = new LinkedHashSet<>();
for (LocalVariableInfo e: lvt.localVariables()) {
foundNames.add(e.name().stringValue());
}
Set<String> expectNames = new LinkedHashSet<>(Arrays.asList(expect.value()));
if (!foundNames.equals(expectNames)) {
Set<String> foundOnly = new LinkedHashSet<>(foundNames);
foundOnly.removeAll(expectNames);
for (String s: foundOnly)
error("Unexpected name found: " + s);
Set<String> expectOnly = new LinkedHashSet<>(expectNames);
expectOnly.removeAll(foundNames);
for (String s: expectOnly)
error("Expected name not found: " + s);
}
}
MethodModel getMethodByName(ClassModel cf, String name) {
for (MethodModel m: cf.methods()) {
if (m.methodName().stringValue().startsWith(name))
return m;
}
return null;
}
/** Report an error. */
void error(String msg) {
System.err.println("Error: " + msg);
errors++;
}
int errors;
/**
* Annotation used to provide the set of names expected in the LVT attribute.
*/
@Retention(RetentionPolicy.RUNTIME)
@interface Expect {
String[] value();
}
/*
* ---------- Test cases ---------------------------------------------------
*/
@Expect({ "o", "s" })
static class Pattern_Simple {
public static void test(Object o) {
if (o instanceof String s) {
s.length();
}
}
}
@Expect({ "s" })
static class Pattern_Lambda {
public static void test(Object o) {
if (o instanceof String s) {
Runnable r = () -> {
s.length();
};
}
}
}
}
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