Split ConstraintSystem into a builder type and a verifying key type
#781
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This is an initial refactor performed during Halo 2 Office Hours, to explore the effects of this split on the wider codebase. At the end, we discussed the result, and noted that the verifying key type still contains data in sub-types that is irrelevant to the actual verifying key. The verifying key type is also never exposed in the public API of the verifying key; `ConstraintSystem` was only public for its use in `Circuit::configure`. The likely next steps are: - Rework `PinnedConstraintSystem` to be the verifying key type, only storing the data needed for the transcript, but being an owned type that exposes immutable references via methods instead of its fields being `pub(crate)`. - Undo the `ConstraintSystemBuilder` rename, so we are just removing parts of the `ConstraintSystem` API. - Rework `ConstraintSystem::pinned` and `VerifyingKey::from_parts` to instead become the builder method for the verifying key type along with the data that is cached alongside it inside `VerifyingKey`. - Refactor the very few methods that we identified as only relevant to the verifying key type, as they are only used redundantly.
This was referenced Jun 6, 2023
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This is an initial refactor performed during Halo 2 Office Hours, to explore the effects of this split on the wider codebase.
At the end, we discussed the result, and noted that the verifying key type still contains data in sub-types that is irrelevant to the actual verifying key. The verifying key type is also never exposed in the public API of the verifying key;
ConstraintSystemwas only public for its use inCircuit::configure.The likely next steps are:
PinnedConstraintSystemto be the verifying key type, only storing the data needed for the transcript, but being an owned type that exposes immutable references via methods instead of its fields beingpub(crate).ConstraintSystemBuilderrename, so we are just removing parts of theConstraintSystemAPI.ConstraintSystem::pinnedandVerifyingKey::from_partsto instead become the builder method for the verifying key type along with the data that is cached alongside it insideVerifyingKey.