saturate instances on structure declaration #334
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gares
commented
Feb 16, 2023
gares
commented
Feb 16, 2023
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don't forget to undup the list of types. |
gares
commented
Mar 1, 2023
gares
commented
Mar 31, 2023
gares
commented
May 22, 2023
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I'm reviving this since we really need it in the contest of coreact. |
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I'll rebase on top of master and then force push. |
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@ThomasPortet do you mind if I squash the history? There are so many changes on the same lines that rebasing other work on this PR is quite tedious. As I was saying this PR is really needed for the Coreact project, and we need to rebase our work there on this one. Then I think I can merge and maybe open a few issues for some of the TODOs so that we don't forget about them. |
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@CohenCyril I need you help, I'd like to run CI on math-comp and co, but here it succeeds super fast. I've the impression it is not using this branch of HB. |
gares
commented
Oct 8, 2023
gares
commented
Oct 8, 2023
gares
commented
Oct 8, 2023
gares
commented
Oct 8, 2023
This was referenced Oct 8, 2023
When a new structure `S` is created it may be the case that some type which is already equipped with some mixins is an instance of `S`, but was not declared as such since `S` was not declared yet. Similarly, mixin instances which have parameters may not be available on a single type until there is a structure for the parameter which is rich enough. We store in the predicate `has-mixin-instance` the list of types which have mixin instances, so that we can reconsider them later. Out of these we craft `mixin-src` clauses (used by `HB/common/inference.elpi`) which have premises using Coq's unifyer (which in turn can compute the smallest structure having all requirements thanks to the hints we declare on joins). Example: When such an instance is declared: ```coq HB.instance Definition I1 (X:t1) : mixin1 (list X) := ... . ``` a clause of this form is generated: ```coq has-mixin-instance (cs-gref (indt «list»)) (indt «mixin1.axioms_») (const «I1») ``` When `HB.saturate` is called, we generate conditional `mixin-src` clauses with conditions on parameters (via the function `has-mixin-instance->mixin-src`). Then for each type constructor mentioned in a `has-mixin-src` clause we try to declare new instances with the new clauses via `declare-all-on-type-constructor`. Unresolved parameters are abstracted out. Their type is the smallest structure which can satisfy all the constraints coming from single mixins.
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Fix #197