On Sat, 23 Sep 2023 09:47:42 GMT, 温绍锦 <d...@openjdk.org> wrote:
>> 1. Reduce duplicate stringSize code
>> 2. Move java.lang.StringLatin1.getChars to
>> jdk.internal.util.DecimalDigits::getCharLatin1，not only java.lang, other
>> packages also need to use this method
>
> 温绍锦 has updated the pull request incrementally with one additional commit
> since the last revision:
>
> refactor HexDigits & OctalDigits & FormatItem, FormatItem#prepend provides
> two implementations: prependLatin1 and prependUTF16 [v2]
> Since the current `MethodHandle`-based char putter can only put 1-byte at
> once, have you considered something like this:
>
> ```java
> // A replacement for setter MethodHandle, or VarHandle, to accept multiple
> value types
> public interface DigitConsumer {
> void putChar(byte[] array, int index, byte value);
> // put 2 byte-sized chars at once, encoded little endian
> void putChar2(byte[] array, int index, short value);
> // you can add putChar4, putChar8, etc. if you need
> }
> ```
>
> and `StringConcatHelper.selectPutChar` will return a `DigitConsumer` instead
> of a `MethodHandle`.
>
> Currently, you are allocating a new byte array for every number in the
> format, which I deem very inefficient.
Code based on MethodHandler is difficult to maintain and debug. We should
remove the use of MethodHandle in FormatItem.
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PR Comment: https://git.openjdk.org/jdk/pull/15699#issuecomment-1732271564
