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  1. JDK
  2. JDK-8134007

Improve string folding

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      Description

        Javac string folding implemented in the parser could use some improvements. Currently, given a concat of the kind:

        String1 + String2 + String3 ..... + StringN

        This is either left untouched (if there's an X such that StringX is not a literal) or it is all folded into a single StringRes.

        A better implementation would be to generalize this to have folding to return:

        StringRes1 + StringRes2 + .... StringResM

        Where some of the expressions in the result are the concatenation of some of the original input strings, while some other expressions are left alone (i.e. the ones that are not ident). In chronic cases like the one in this bug, this should allow for quite a big boost (as the identifiers are only used once and in close proximity).

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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-8142230 Improve string folding

            • 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-8143815 Improve string folding

            • 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-8149315 Improve string folding

            • 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-8155500 Improve string folding

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

            Enhancement - null JDK-8142440 String folding stops when a non-constant object is reached

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

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                mcimadamore Maurizio Cimadamore
                shadowbug Shadow Bug
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