On Wed, 30 Apr 2025 14:12:36 GMT, Roger Riggs <rri...@openjdk.org> wrote:
> Refactor AbstractStringBuilder to maintain consistency among count, coder,
> and value buffers while the buffer capacity is being expanded and/or inflated
> from Latin1 to UTF16 representations.
> The refactoring pattern is to read and write AbstractStringBuilder fields
> once using locals for all intermediate values.
> Support methods are static, designed to pass all values as arguments and
> return a value.
>
> The value byte array is reallocated under 3 conditions:
> - Increasing the capacity with the same encoder
> - Increasing the capacity and inflation to change the coder from LATIN1 to
> UTF16
> - Inflation with the same capacity
>
> Added StressSBTest to exercise public instance methods of StringBuilder.
src/java.base/share/classes/java/lang/AbstractStringBuilder.java line 732:
> 730: byte[] value = ensureCapacitySameCoder(this.value, coder, count
> + 4);
> 731: if (isLatin1(coder)) {
> 732: value[count++] = 'n';
Can we benefit from MergeStores if we use fixed `count` offsets and then bump
up `count` by four after the stores?
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PR Review Comment: https://git.openjdk.org/jdk/pull/24967#discussion_r2068778082
