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  1. JDK
  2. JDK-8300786 JEP 447: Statements before super(...) (Preview)
  3. JDK-8194743

Compiler implementation for Statements before super()

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Details

    • Sub-task
    • Resolution: Fixed
    • P4
    • 22
    • None
    • tools
    • None
    • b26

    Backports

      Description

        Currently it is not permitted to precede the `this()` or `super()` call in a constructor invocation with statements. This often causes distorted control flow and challenges in refactoring.

        We would amend JLS 8.8.7 as follows:

        - Production is amended to:

            ConstructorBody:
                { [ BlockStatements ] [ ExplicitConstructorInvocation ] [ BlockStatements ] }
         
        - Restriction about first statement is relaxed to apply to the explicit ctor invocation, wherever it resides.

        - s/begin with/include/

        - Add note (somewhere) that in the first BlockStatement, `this` is DU, and in the second, `this` is DA.

        - Clarify that a return statement may only be used in the second BlockStatements.


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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-8324795 Compiler implementation for Statements before super()

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            csr for

            CSR - null JDK-8302041 Permit additional statements before this/super in constructors

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            duplicates

            Task - A task that needs to be done. JDK-8302038 compiler implementation for statements before super()

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8193760 allow code in a constructor before the call to the super constructor

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8301649 Compiler allows class type parameters inside super()'s static context

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Sub-task - The sub-task of the issue JDK-8325805 Compiler Implementation for Flexible Constructor Bodies (Second Preview)

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • In Progress

            Bug - A problem which impairs or prevents the functions of the product. JDK-8321207 javac is not accepting correct code

            • P3 - Major loss of function.
            • Resolved

            JEP - Java Enhancement Proposal JDK-8300786 JEP 447: Statements before super(...) (Preview)

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

            Commit Commit openjdk/jdk/12e983a7

            Commit Commit openjdk/valhalla/256f8ad7

            Review Review openjdk/jdk/13656

            Review Review openjdk/valhalla/981

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                acobbs Archie Cobbs
                briangoetz Brian Goetz
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                Dates

                  Created:
                  Updated:
                  Resolved: