hotspot/test/runtime/BoolReturn/NativeSmallIntCallsTest.java

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/* @test
 * @bug 8149170
 * @summary Test native functions return booleans as 0/1 but differently than java functions
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @compile BoolConstructor.java
 * @run main/native NativeSmallIntCallsTest
 */

// This test shows that returns from native calls for boolean truncate to JNI_TRUE if value != 0
// and JNI_FALSE if value returned is 0.

import jdk.test.lib.Asserts;

public class NativeSmallIntCallsTest {
    static native boolean nativeCastToBoolCallTrue();
    static native boolean nativeCastToBoolCallFalse();
    static native boolean nativeCallBoolConstructor(int visible, boolean expected);
    static {
        System.loadLibrary("NativeSmallIntCalls");
    }

    public static void main(java.lang.String[] unused) throws Exception {
        // Call through jni
        // JNI makes all results != 0 true for compatibility
        boolean nativeTrueVal = nativeCastToBoolCallTrue();
        Asserts.assertTrue(nativeTrueVal, "trueval is false!");

        boolean nativeFalseVal = nativeCastToBoolCallFalse();
        Asserts.assertTrue(nativeFalseVal, "falseval is false in native!");

        // Call a constructor or method that passes jboolean values into Java from native
        nativeCallBoolConstructor(1, true);
        nativeCallBoolConstructor(0x10, true);
        nativeCallBoolConstructor(0x100, false);
        nativeCallBoolConstructor(0x1000, false);
    }
}