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Experimental. Turned out to be much harder to implement than I thought. The main
issue is that the reification in the native compiler and the VM is not quite
untyped. Indeed, type annotations for lambdas have to be reconstructed. Hence,
when reifying an application u = t a1 ... an, the type of t has to be known or
reconstructed. It is always possible to do so in plain CIC, when u is in normal
form and its type is known. However, with partial terms this may no longer be
the case, as in: ?1 a1 ... an. So we also compile and evaluate the type of
evars and metas.
This still has to be tested more extensively, but the correction of the kernel
native conversion (on terms without evars or metas) should not be impacted.
Much of this could be reused for the VM.
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inductive types. This saves some computation, but also allows
incidentally to retype terms with evars without failing if an
inductive type as an argument whose type is an evar.
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1. sorts.ml: A small file utility for sorts;
2. constr.ml: Really low-level terms, essentially kind_of_constr, smart
constructor and basic operators;
3. vars.ml: Everything related to term variables, that is, occurences
and substitution;
4. context.ml: Rel/Named context and all that;
5. term.ml: derived utility operations on terms; also includes constr.ml
up to some renaming, and acts as a compatibility layer, to be deprecated.
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local variables which is a different from the one of its definition. E.g.:
Section A.
Variable n:nat.
Definition c:=n.
Goal True.
clear n.
Check c.
[I'm however unsure that "n" should not continue to be accessible via
some global (qualified) name, even after the "clear n".]
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native OCaml code.
Warning: the "retroknowledge" mechanism has not been ported to the native
compiler, because integers and persistent arrays will ultimately be defined as
primitive constructions. Until then, computation on numbers may be faster using
the VM, since it takes advantage of machine integers.
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compiler warnings).
I was afraid that such a brutal refactoring breaks some obscure
invariant about linking order and side-effects but the standard
library still compiles.
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especially about unused definitions, unused opens and unused rec
flags.
The following patch uses information gathered using these warnings to
clean Coq source tree. In this patch, I focused on warnings whose fix
are very unlikely to introduce bugs.
(a) "unused rec flags". They cannot change the semantics of the program
but only allow the inliner to do a better job.
(b) "unused type definitions". I only removed type definitions that were
given to functors that do not require them. Some type definitions were
used as documentation to obtain better error messages, but were not
ascribed to any definition. I superficially mentioned them in one
arbitrary chosen definition to remove the warning. This is unaesthetic
but I did not find a better way.
(c) "unused for loop index". The following idiom of imperative
programming is used at several places: "for i = 1 to n do
that_side_effect () done". I replaced "i" with "_i" to remove the
warning... but, there is a combinator named "Util.repeat" that
would only cost us a function call while improving readibility.
Should'nt we use it?
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Util only depends on Ocaml stdlib and Utf8 tables.
Generic pretty printing and loc functions are in Pp.
Generic errors are in Errors.
+ Training white-spaces, useless open, prlist copies random erasure.
Too many "open Errors" on the contrary.
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information coming from tactics on how to solve cst/cst critical pairs
in the kernel conversion machine).
In r14448, extra Cast's were removed from kernel type-checker but
(erroneously) not from the terms actually registered in the
environment.
The current commit completes the work by registering the term output
by the type-checker and not the original term. Note that this needs to
move hconsing from before to after typing.
On the Coq library, propagating Cast (without keeping them on disk)
induces a stable 1% speedup (Xeon w3540). Having hcons before or after
type-checking makes no difference. It remains to test on user contribs
whether the current commit compensates the slow down and vo size
increasing coming with the improvement made to Qed in r14407.
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tactic steps (r14407) increased the size of proof-terms, leading in
some cases (e.g. in Nijmegen/Algebra) to calls to simpl becoming
extremely costly on such terms built with tactics.
We try as a workaround to remove the newly introduced Cast after it
has been used by the type-checking algorithm.
We incidentally fixed eq_constr which was not fully transparent wrt
casts. We also removed useless code in judge_of_apply (has_revert).
Note: checker still to be updated to reflect a possible use of this
new kind of cast.
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that the kernel conversion solves the delta/delta critical pair the
same way the tactics did. This allows to improve Qed time when slow
down is due to conversion having (arbitrarily) made the wrong choice.
Propagation is done thanks to a new kind of cast called REVERTcast.
Notes:
- Vm conversion not modified
- size of vo generally grows because of additional casts
- this remains a heuristic... for the record, when a reduction tactic
is applied on the goal t leading to new goal t', this is translated
in the kernel in a conversion t' <= t where, hence, reducing in t'
must be preferred; what the propagation of reduction cast to the
kernel does not do is whether it is preferable to first unfold c or
to first compare u' and u in "c u' = c u"; in particular,
intermediate casts are sometimes useful to solve this kind of issues
(this is the case e.g. in Nijmegen/LinAlg/subspace_dim.v where the
combination "simpl;red" needs the intermediate cast to ensure Qed
answers quickly); henceforth the merge of nested casts in mkCast is
deactivated
- for tactic "change", REVERTcast should be used when conversion is in
the hypotheses, but convert_hyp does not (yet) support this (would
require e.g. that convert_hyp overwrite some given hyp id with a
body-cleared let-binding new_id := Cast(old_id,REVERTCast,t))
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This reverts commit 33434695615806a85cec88452c93ea69ffc0e719.
Conflicts:
kernel/term_typing.ml
test-suite/success/polymorphism.v
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when a "match" is kernel-ill-typed (probably rarely visible from end
user anyway but useful for debugging) + dead code.
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No need to tell the world about the fact that constraints are
implemented via caml's Set. Other modules just need to know about
the empty and union functions (and addition functions "enforce_geq"
and "enforce_eq" that were already there).
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In particular, the unused lib/tlm.ml and lib/gset.ml are removed
In addition, to simplify code, Libobject.record_object returning only the
('a->obj) function, which is enough almost all the time.
Use Libobject.record_object_full if you really need also the (obj->'a).
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- Many of them were broken, some of them after Pierre B's rework
of mli for ocamldoc, but not only (many bad annotation, many files
with no svn property about Id, etc)
- Useless for those of us that work with git-svn (and a fortiori
in a forthcoming git-only setting)
- Even in svn, they seem to be of little interest
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constantes qui avait été mise en place pour la 8.1gamma puis abandonné
pour cause entre autres d'inefficacité. Cette fois, on restreind le
polymorphisme au seul cas d'alias vers un inductif.
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(i.e. "Inductive unit := tt." conduisait à "t:Prop" alors que le
principe de la hiérarchie d'univers est d'être cumulative -- et que
Set en soit le niveau 0).
Une solution aurait été de poser Prop <= Set mais on adopte une autre
solution. Pour éviter le côté contre-intuitif d'avoir unit dans Type
et Prop <= Set, on garde la représentation de Prop au sein de la
hiérarchie prédicative sous la forme "Type (max ([],[])" (le niveau
sans aucune contrainte inférieure, appelons Type -1) et on adapte les
fonctions de sous-typage et de typage pour qu'elle prenne en compte la
règle Type -1 <= Prop (cf reduction.ml, reductionops.ml, et effets
incidents dans Termops.refresh_universes et Univ.super).
Petite uniformisation des noms d'univers et de sortes au passage
(univ.ml, univ.mli, term.ml, term.mli et les autres fichiers).
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Amélioration affichage des univers. Réparation de petits oublis du premier
commit. Essai d'une nouvelle stratégie : si le type d'une constante
est mentionné explicitement, la constante est monomorphe dans Type.
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(suppression au passage d'un cast dans constant_entry_of_com - ce
n'est pas normal qu'on force le type s'il n'est pas déjà présent mais
en même temps il semble que ce cast serve pour rafraîchir les univers
algébriques...)
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(i.e. cachées sous un nom de constante) sont considérées comme
monomorphes.
- Divers: renommage type_of_applied_inductive, un peu de documentation.
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- prise en compte du niveau à la déclaration du type comme une fonction
des sortes des conclusions des paramètres uniformes
- suppression du retypage de chaque instance de type inductif (trop coûteux)
et donc abandon de l'idée de calculer une sorte minimale même dans
des cas comme Inductive t (b:bool) := c : (if b then Prop else Type) -> t.
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Ajout de cast indiquant au kernel la strategie a suivre
Resolution du bug sur les coinductifs
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to accept a mind_specif (a couple mutual_inductive_body * one_inductive_body)
instead of looking it up in the environment. A version of the same functions
with the old type is put in Inductiveops (outside the kernel).
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concretement ImpredicativeSet
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possibilité de partage)
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commandes vernaculaires (cf dev/changements.txt pour plus de précisions)
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