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  1. JDK
  2. JDK-8237514

Spec Clarification - ByteBuffer::alignmentOffset Spec

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Details

    • Enhancement
    • Status: Resolved
    • P3
    • Resolution: Fixed
    • 14
    • 14
    • core-libs
    • b32
    • b35

    Backports

      Description

        As per the updated spec:
        https://download.java.net/java/early_access/jdk14/docs/api/java.base/java/nio/ByteBuffer.html#alignmentOffset(int,int)

        "Specifically, the index should either be decremented by the return value, or incremented by the unit size minus the return value. Therefore given

         int value = alignmentOffset(index, unitSize)
        then the identities
         alignmentOffset(index - value, unitSize) == 0
        and
         alignmentOffset(index + (unitSize - value), unitSize) == 0
        must hold."

        I see it' s a normative spec.

        But the mentioned statement is not valid for some values of index and unitSize.

        Please see the attached code snippet.
        It will pass some times and throws IllegalArgumentException sometimes.

        Can you please clarify this.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8238482 Spec Clarification - ByteBuffer::alignmentOffset Spec

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8238490 Spec Clarification - ByteBuffer::alignmentOffset Spec

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8238519 Spec Clarification - ByteBuffer::alignmentOffset Spec

            • P3 - Major loss of function.
            • Resolved
            csr for

            CSR - null JDK-8238368 Spec Clarification - ByteBuffer::alignmentOffset Spec

            • P3 - Major loss of function.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8230665 (bf spec) ByteBuffer::alignmentOffset spec misleading when address is misaligned

            • P3 - Major loss of function.
            • Resolved

            CSR - null JDK-8236826 (bf spec) ByteBuffer::alignmentOffset spec misleading when address is misaligned

            • P3 - Major loss of function.
            • Closed
            links to

            Commit Commit openjdk/panama-foreign/7db8a176

            Web Link nio-dev review

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              People

                bpb Brian Burkhalter
                kganapureddy Krushnareddy Ganapureddy
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                Dates

                  Created:
                  Updated:
                  Resolved: