diff options
author | letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-04-03 11:23:31 +0000 |
---|---|---|
committer | letouzey <letouzey@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-04-03 11:23:31 +0000 |
commit | 5681594c83c2ba9a2c0e21983cac0f161ff95f02 (patch) | |
tree | ea458a8321f71b3e2fba5d67cfc3f79866241d48 /checker/declarations.mli | |
parent | da1e32cbdc78050ea2e89eee896ba2b40db1b5dd (diff) |
Lazy loading of opaque proofs: fast as -dont-load-proofs without its drawbacks
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.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13952 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'checker/declarations.mli')
-rw-r--r-- | checker/declarations.mli | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/checker/declarations.mli b/checker/declarations.mli index b5038996c..90beb326b 100644 --- a/checker/declarations.mli +++ b/checker/declarations.mli @@ -29,16 +29,40 @@ type constr_substituted val force_constr : constr_substituted -> constr val from_val : constr -> constr_substituted -type inline = int option (* inlining level, None for no inlining *) +(** Beware! In .vo files, lazy_constr are stored as integers + used as indexes for a separate table. The actual lazy_constr is restored + later, by [Safe_typing.LightenLibrary.load]. This allows us + to use here a different definition of lazy_constr than coqtop: + since the checker will inspect all proofs parts, even opaque + ones, no need to use Lazy.t here *) + +type lazy_constr +val force_lazy_constr : lazy_constr -> constr +val lazy_constr_from_val : constr_substituted -> lazy_constr + +(** Inlining level of parameters at functor applications. + This is ignored by the checker. *) + +type inline = int option + +(** A constant can have no body (axiom/parameter), or a + transparent body, or an opaque one *) + +type constant_def = + | Undef of inline + | Def of constr_substituted + | OpaqueDef of lazy_constr type constant_body = { const_hyps : section_context; (* New: younger hyp at top *) - const_body : constr_substituted option; + const_body : constant_def; const_type : constant_type; const_body_code : to_patch_substituted; - const_constraints : Univ.constraints; - const_opaque : bool; - const_inline : inline } + const_constraints : Univ.constraints } + +val body_of_constant : constant_body -> constr_substituted option +val constant_has_body : constant_body -> bool +val is_opaque : constant_body -> bool (* Mutual inductives *) |