[code-reflection] RFR: [hat] Enable padding in the codegen as an option for the iFace types and Schemas

[duke]

On Wed, 27 Aug 2025 13:10:25 GMT, Juan Fumero <jfumero at openjdk.org> wrote:

> This PR extends the C99 code generator to allow the generation of padding if this option is specified in the Hat Data Type Schema. 
> 
> For instance: 
> 
> 
> Schema<F32Array> schema = Schema.of(F32Array.class, f32Array->f32Array
>             .arrayLen("length").pad(12).array("array"));
> 
> 
> Generates this C99 struct:
> 
> 
> typedef struct F32Array_s{
>     int length;
>     char pad$ZArmN[12];   // pad$ + 5 random letter to avoid accidental collision with other members of the buffer type
>     float array[1];
> }F32Array_t;
> 
> 
> This change is required to enable efficient local memory: See https://github.com/openjdk/babylon/pull/531

@jjfumero 
Your change (at version a1fc95af12d2c5a75640f068395a57ea76ff555f) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/babylon/pull/534#issuecomment-3228161833