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Make this module deal only with opaque proofs.
Make discharging/substitution invariant more explicit via a third constructor.
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When you resume the compilation of a .vi file, you want to
avoid collisions on fresh names.
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To obtain a.vo one can now:
1) coqtop -quick -compile a
2) coqtop -vi2vo a.vi
To make that possible the .vo structure has been complicated. It is now
made of 5 segments.
| vo | vi | vi2vo | contents
--------------+------+-----+-------+------------------------------------
lib | Yes | Yes | Yes | libstack (modules, notations,...)
opauqe_univs | No | Yes | Yes | constraints coming from opaque proofs
discharge | No | Yes | No | data needed to close sections
tasks | No | Yes | No | STM tasks to produce proof terms
opaque_proofs | Yes | Yes | Yes | proof terms
--------------+------+-----+-------+------------------------------------
This means one can load only the strictly necessay parts. Usually one
does not load the tasks segment of a .vi nor the opaque_proof segment of
a .vo, unless one is turning a .vi into a .vo, in which case he load
all the segments.
Optional segments are marshalled as None. But for lib, all segments
are Array.t of:
| type
--------------+---------------------------------------------------------
lib | a list of Libobject.obj (n'importe quoi)
opauqe_univs | Univ.consraints Future.computation
discharge | what Cooking.cook_constr needs
tasks | Stm.tasks (a task is system_state * vernacexpr list)
opaque_proofs | Term.constr Future.computation
--------------+------+-----+-------+------------------------------------
Invariant: all Future.computation in a vo file (obtained by a vi2vo
compilation or not) have been terminated with Future.join (or
Future.sink). This means they are values (inside a box).
This invariant does not hold for vi files. E.g. opauqe_proofs can be
dangling Future.computation (i.e. NotHere exception). The vi2vo
compilation step will replace them by true values.
Rationale for opaque_univs: in the vi2vo transformation we want to reuse
the lib segment. Hence the missing pieces have to be put on the side,
not inside. Opaque proof terms are already in a separte segment.
Universe constraints are not, hence the new opauqe_univs segment. Such
segment, if present in a .vo file, is always loaded, and
Declare.open_constant will add to the environment the constraints stored
there. For regular constants this is not necessay since the constraints
are already in their enclosing module (and also in the constant_body).
With vi2vo the constraints coming from the proof are not in the
constant_body (hence not in the enclosing module) but there and are
added to the environment explicitly by Declare.open_constant.
Rationale for discharge: vi2vo produces a proof term in its original
context (in the middle of a section). Then it has to discharge the
object. This segment contains the data that is needed in order to do
so. It is morally the input that Lib.close_section passes to Cooking
(via the insane rewinding of libstack, GlobalRecipe, etc chain).
Checksums: the checksum of .vi and a .vo obtain from it is the same.
This means that if if b.vo has been compiled using a.vi, and then
a.vi is compiled into a.vo, Require Import b works (and recursively
loads a.vo).
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discrepancy introduced in commit d3eac3d5fc8e5af499eb8750ca08ead8562dac6f
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discrepancy introduced in commit 400327165edcba667ebb70ebb89052455656b719
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It fixes micromega. It is frankly a mystery to me why psatz ever work. The semantics of Ltac's match is still fishy.
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I'm trying to avoid unecessary construction of intermediate lists. Interpretation function don't modify the goals, they just need a goal in their
context.
Some care has to be given to the evar maps, though, as we can extract an outdated evar map from a goal (this is probably an undesirable feature, but significantly simplified the compatibility API).
Also, Proofview.Goal.enter{,l} catch exceptions (and transfer the non-critical ones into errors of the tactics monad). So I had to do just that for every "enter" removed (I probably have been overprotective but it's better that way).
Not as trivial a modification as it should, but it will hopefully go over well. It was much needed anyway.
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Two changes:
- 'a Lazy.t becomes unit -> 'a
- 'a t becomes 'a u (the view type)
This spares two Lazy.force, and leverages Lazy.lazy_from_fun. Considering Lazy.force is fairly slow, in particular because of the write-barrier, this should be beneficial.
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Lazy.lazy_from_val does almost the same thing as this Obj.magic. It makes some extra dynamic check, but it's frankly unlikely that it could be observed.
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View types are better practice than option types for pattern-matching. (Plus, they save a minute amount of allocations)
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(excepts list of args that must be constructors
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syntax mentionning simpl remains
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to dump states that Evarconv.eq_appr_x tries to unify.
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subst1 case.
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containing opaque grammar objects, it now contains a string representing
the entry. In order to recover the entry from the string, the former must
have been created with [Pcoq.create_generic_entry] or similar. This is
guaranteed for entries generated by ARGUMENT EXTEND, and must be done by
hand otherwise.
Some plugins were fixed accordingly.
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The coercion code was not seeing such flag and always trying
to resolve type classes. In particular open_contr is pretyped
without type classes.
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