84 lines
2.7 KiB
Java
84 lines
2.7 KiB
Java
/*
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* @test /nodynamiccopyright/
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* @bug 8172880
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* @summary Wrong LineNumberTable for synthetic null checks
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* @enablePreview
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*/
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.*;
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import java.io.IOException;
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import java.util.AbstractMap.SimpleEntry;
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import java.util.Arrays;
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import java.util.List;
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import java.util.Map.Entry;
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import java.util.Objects;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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public class NullCheckLineNumberTest {
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//test data:
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static class Test {
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public Test() {
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String a = "", b = null;
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Stream.of("x")
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.filter(a::equals)
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.filter(b::equals)
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.count();
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}
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}
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public static void main(String[] args) throws Exception {
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List<Entry> actualEntries = findEntries();
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List<Entry> expectedEntries = List.of(
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new SimpleEntry<>(25, 0),
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new SimpleEntry<>(26, 4),
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new SimpleEntry<>(28, 9),
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new SimpleEntry<>(29, 16),
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new SimpleEntry<>(30, 32),
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new SimpleEntry<>(31, 46),
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new SimpleEntry<>(32, 52)
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);
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if (!Objects.equals(actualEntries, expectedEntries)) {
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error(String.format("Unexpected LineNumberTable: %s", actualEntries.toString()));
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}
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try {
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new Test();
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} catch (NullPointerException npe) {
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if (Arrays.stream(npe.getStackTrace())
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.noneMatch(se -> se.getFileName().contains("NullCheckLineNumberTest") &&
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se.getLineNumber() == 30)) {
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throw new AssertionError("Should go through line 30!");
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}
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}
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}
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static List<Entry> findEntries() throws IOException {
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ClassModel self = ClassFile.of().parse(Objects.requireNonNull(Test.class.getResourceAsStream("NullCheckLineNumberTest$Test.class")).readAllBytes());
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for (MethodModel m : self.methods()) {
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if ("<init>".equals(m.methodName().stringValue())) {
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CodeAttribute code_attribute = m.findAttribute(Attributes.code()).orElseThrow();
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for (Attribute<?> at : code_attribute.attributes()) {
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if (at instanceof LineNumberTableAttribute lineAt) {
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return lineAt.lineNumbers().stream()
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.map(e -> new SimpleEntry<> (e.lineNumber(), e.startPc()))
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.collect(Collectors.toList());
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}
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}
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}
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}
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return null;
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}
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static void error(String msg) {
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throw new AssertionError(msg);
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}
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}
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