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The earlier type [struct_expr_body] was far too broad,
leading to code with unclear invariants, many "assert false", etc etc.
Its replacement [module_alg_expr] has only three constructors:
* MEident
* MEapply : note the module_path as 2nd arg, no more constraints here
* MEwith : no more constant_body inside, constr is just fine
But no more SEBfunctor or SEBstruct constructor here (see below).
This way, this datatype corresponds to algebraic expressions,
i.e. anything that can appear in non-interactive modules.
In fact, it even coincides now with [Entries.module_struct_entry].
- Functor constructors are now necessarily on top of other
structures thanks to a generic [functorize] datatype.
- Structures are now separated from algebraic expressions by design :
the [mod_type] and [typ_expr] fields now only contain structures
(or functorized structures), while [mod_type_alg] and [typ_expr_alg]
are restricted to algebraic expressions only.
- Only the implementation field [mod_expr] could be either algebraic
or structural. We handle this via a specialized datatype
[module_implementation] with four constructors:
* Abstract : no implementation (cf. for instance Declare Module)
* Algebraic(_) : for non-interactive modules, e.g. Module M := N.
* Struct(_) : for interactive module, e.g. Module M : T. ... End M.
* FullStruct : for interactive module with no type restriction.
The [FullStruct] is a particular case of [Struct] where the implementation
need not be stored at all, since it is exactly equal to its expanded
type present in [mod_type]. This is less fragile than hoping as earlier
that pointer equality between [mod_type] and [mod_expr] will be
preserved...
- We clearly emphasize that only [mod_type] and [typ_expr] are
relevant for the kernel, while [mod_type_alg] and [typ_expr_alg]
are there only for a nicer extraction and shorter module printing.
[mod_expr] is also not accessed by the kernel, but it is important
for Print Assumptions later.
- A few implicit invariants remain, for instance "no MEwith in mod_expr",
see the final comment in Declarations
- Heavy refactoring of module-related files : modops, mod_typing,
safe_typing, declaremods, extraction/extract_env.ml ...
- Coqchk has been adapted accordingly. The code concerning MEwith
in Mod_checking is now gone, since we cannot have any in mod_expr.
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Since the nametab isn't aware of everything needed to print mismatched
types (cf the bug test-cases), we create a robust term printer that
known how to print a fully-qualified name when [shortest_qualid_of_global]
has failed. These Printer.safe_pr_constr and alii are meant to never fail
(at worse they display "??", for instance when the env isn't rich enough).
Moreover, the environnement may have changed between the raise
of NotConvertibleTypeField and its display, so we store the original
env in the exception.
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- constr_substituted and lazy_constr are now in a dedicated kernel/lazyconstr.ml
- the functions that were in declarations.ml (mostly substitution utilities
and hashcons) are now in kernel/declareops.ml
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* Remove the mind_of_delta and constant_of_delta functions,
prefer instead the {mind,constant}_of_delta_kn functions.
* Attempt to make subst_ind and subst_con0 more self-contained
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Ok, this is merely a matter of taste, but up to now the usage
in Coq is rather to use capital letters instead of _ in the
names of inner modules.
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the new Int module. Only the most obvious were removed, so there
are a lot more in the wild.
This may sound heavyweight, but it has two advantages:
1. Monomorphization is explicit, hence we do not miss particular
optimizations of equality when doing it carelessly with the generic
equality.
2. When we have removed all the generic equalities on integers, we
will be able to write something like "let (=) = ()" to retrieve all
its other uses (mostly faulty) spread throughout the code, statically.
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List module. That way, an "open Util" in the header permits using
any function of CList in the List namespace (and in particular, this
permits optimized reimplementations of the List functions, as, for
example, tail-rec implementations.
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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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We now accept the following code: Definition E := 0. Module E. End E.
Techically, we simply allow the same label to occur at most twice in
a structure_body, which is a (label * structure_field_body) list).
These two label occurences should not be at the same level of fields
(e.g. a SFBmodule and a SFBmind are ok, but not two SFBmodule's or
a SFBmodule and a SFBmodtype). Gain : a minimal amount of code change.
Drawback : no more simple List.assoc or equivalent should be performed
on a structure_body ...
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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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Most of the time, a constant name is built from:
- a kernel_name for its user part
- a delta_resolver applied to this kernel_name for its canonical part
With this patch we avoid building unnecessary constants for immediately
amending them (cf in particular the awkward code removed in safe_typing).
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The env was used for a particular case of Cbytegen.compile_constant_body,
but we can actually guess that it will answer a particular BCallias con.
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After discussion with Bruno and Hugo, coqtop now accepts that an opaque
constant in a module type could be implemented by anything of
the right type, even if bodies differ. Said otherwise, with respect
to subtyping, an opaque constant behaves just as a parameter.
This was already the case in coqchk, and a footnote in documentation
is advertising for quite some time that:
"Opaque definitions are processed as assumptions."
Truly, it might seem awkward that "Definition x:=3" can implement
"Lemma x:nat. Proof 2. Qed." but the opacity ensures that nothing
can go wrong afterwards, since Coq is forced to ignore that the x
in signature has body "2".
Similarly, "T with Definition x := c" is now legal when T contains
an opaque x, even when this x isn't convertible with c.
By avoiding accesses to opaque bodies, we also achieve some speedup
(less delayed load of .vo final sections containing opaque terms).
Nota: the extraction will have to be adapted, since for the moment it
might access the body of opaque constants: the warning emitted when
doing that should become an error.
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The recent experiment with -dont-load-proofs in the stdlib showed that
this options isn't fully safe: some axioms were generated (Include ?
functor application ? This is still to be fully understood).
Instead, I've implemented an idea of Yann: only load opaque proofs when
we need them. This is almost as fast as -dont-load-proofs (on the stdlib,
we're now 15% faster than before instead of 20% faster with -dont-load-proofs),
but fully compatible with Coq standard behavior.
Technically, the const_body field of Declarations.constant_body now regroup
const_body + const_opaque + const_inline in a ternary type. It is now either:
- Undef : an axiom or parameter, with an inline info
- Def : a transparent definition, with a constr_substituted
- OpaqueDef : an opaque definition, with a lazy constr_substitued
Accessing the lazy constr of an OpaqueDef might trigger the read on disk of
the final section of a .vo, where opaque proofs are located.
Some functions (body_of_constant, is_opaque, constant_has_body) emulate
the behavior of the old fields. The rest of Coq (including the checker)
has been adapted accordingly, either via direct access to the new const_body
or via these new functions. Many places look nicer now (ok, subjective notion).
There are now three options: -lazy-load-proofs (default), -force-load-proofs
(earlier semantics), -dont-load-proofs. Note that -outputstate now implies
-force-load-proofs (otherwise the marshaling fails on some delayed lazy).
On the way, I fixed what looked like a bug : a module type
(T with Definition x := c) was accepted even when x in T was opaque.
I also tried to clarify Subtyping.check_constant.
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be able to call term printers.
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Note: I'm unsure about some subtyping error case apparently involving
aliases of inductive types (middle of Subtyping.check_inductive); I
bound it to some NotEqualInductiveAliases error, but this has to be
checked.
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that the fields had the same names but that the parameters of the
record had exactly the same names too.
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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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- 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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1- Management of the name-space in a modular development / sharing of non-logical objects.
2- Performance of atomic module operations (adding a module to the environment, subtyping ...).
1-
There are 3 module constructions which derive equalities on fields from a module to another:
Let P be a module path and foo a field of P
Module M := P.
Module M.
Include P.
...
End M.
Declare Module K : S with Module M := P.
In this 3 cases we don't want to be bothered by the duplication of names.
Of course, M.foo delta reduce to P.foo but many non-logical features of coq
do not work modulo conversion (they use eq_constr or constr_pat object).
To engender a transparent name-space (ie using P.foo or M.foo is the same thing)
we quotient the name-space by the equivalence relation on names induced by the
3 constructions above.
To implement this, the types constant and mutual_inductive are now couples of
kernel_names. The first projection correspond to the name used by the user and the second
projection to the canonical name, for example the internal name of M.foo is
(M.foo,P.foo).
So:
*************************************************************************************
* Use the eq_(con,mind,constructor,gr,egr...) function and not = on names values *
*************************************************************************************
Map and Set indexed on names are ordered on user name for the kernel side
and on canonical name outside. Thus we have sharing of notation, hints... for free
(also for a posteriori declaration of them, ex: a notation on M.foo will be
avaible on P.foo). If you want to use this, use the appropriate compare function
defined in name.ml or libnames.ml.
2-
No more time explosion (i hoppe) when using modules i have re-implemented atomic
module operations so that they are all linear in the size of the module. We also
have no more unique identifier (internal module names) for modules, it is now based
on a section_path like mechanism => we have less substitutions to perform at require,
module closing and subtyping but we pre-compute more information hence if we instanciate
several functors then we have bigger vo.
Last thing, the checker will not work well on vo(s) that contains one of the 3 constructions
above, i will work on it soon...
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splay_prod_n, lam_it -> it_mkLambda, splay_lambda -> splay_lam). Added
shortcuts for "fst (decompose_prod t)" and co.
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correction d'un bug sur Import/Export module.
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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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is line, and those below, will be ignored--
M kernel/mod_subst.mli
M kernel/mod_typing.ml
M kernel/mod_subst.ml
M kernel/subtyping.ml
M kernel/modops.ml
M library/declaremods.ml
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-is line, and those below, will be ignored--
M kernel/mod_typing.ml
M kernel/subtyping.ml
M kernel/modops.ml
M library/declaremods.ml
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kernel:
-declaration.ml
unification des representations pour les modules et modules types.
(type struct_expr_body)
-mod_typing.ml
le typage des modules est separe de l'evaluation des modules
-modops.ml
nouvelle fonction qui pour toutes expressions de structure calcule
sa forme evaluee.(eval_struct)
-safe_typing.ml
ajout du support du nouvel operateur Include.(add_include).
library:
-declaremods.ml
nouveaux objets Include et Module-alias et gestion de la resolution de noms pour
les alias via la nametab.
parsing:
-g_vernac.ml4:
nouvelles regles pour le support des Includes et pour l'application des signatures
fonctorielles.
extraction:
Adaptation a la nouvelle representation des modules et support de l'operateur with.
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de deux signatures de modules.
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les interfaces de module (bug similaire à #1302 mais pour les
définitions -- au lieu des inductifs)
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