From 5681594c83c2ba9a2c0e21983cac0f161ff95f02 Mon Sep 17 00:00:00 2001 From: letouzey Date: Sun, 3 Apr 2011 11:23:31 +0000 Subject: 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 --- library/states.ml | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'library/states.ml') diff --git a/library/states.ml b/library/states.ml index 4619b3b53..c88858f7e 100644 --- a/library/states.ml +++ b/library/states.ml @@ -20,7 +20,10 @@ let unfreeze (fl,fs) = let (extern_state,intern_state) = let (raw_extern, raw_intern) = extern_intern Coq_config.state_magic_number ".coq" in - (fun s -> raw_extern s (freeze())), + (fun s -> + if !Flags.load_proofs <> Flags.Force then + Util.error "Write State only works with option -force-load-proofs"; + raw_extern s (freeze())), (fun s -> unfreeze (with_magic_number_check (raw_intern (Library.get_load_paths ())) s); -- cgit v1.2.3