langtools/test/tools/javac/8074306/TestSyntheticNullChecks.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * accompanied this code).
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/*
 * @test
 * @bug 8074306 8073432 8074501
 * @summary NULLCHK is emitted as Object.getClass
 * @compile -source 6 -target 6 TestSyntheticNullChecks.java
 * @run main TestSyntheticNullChecks 6
 * @clean TestSyntheticNullChecks*
 * @compile -source 7 -target 7 TestSyntheticNullChecks.java
 * @run main TestSyntheticNullChecks 7
 * @clean TestSyntheticNullChecks*
 * @compile TestSyntheticNullChecks.java
 * @run main TestSyntheticNullChecks 9
 */
public class TestSyntheticNullChecks {

    class Inner { }

    static void generateSyntheticNPE(TestSyntheticNullChecks outer) {
        outer.new Inner(); //javac will generate a synthetic NPE check for 'outer'
    }

    public static void main(String[] args) {
        int version = Integer.valueOf(args[0]);
        boolean useObjects = version >= 7;
        try {
            generateSyntheticNPE(null);
        } catch (NullPointerException npe) {
            boolean hasRequireNotNull = false;
            for (StackTraceElement e : npe.getStackTrace()) {
                if (e.getClassName().equals("java.util.Objects") &&
                        e.getMethodName().equals("requireNonNull")) {
                    hasRequireNotNull = true;
                    break;
                }
            }
            if (hasRequireNotNull != useObjects) {
                throw new AssertionError();
            }
        }
    }
}