(* Title: Pure/Tools/codegen_funcgr.ML
ID: $Id$
Author: Florian Haftmann, TU Muenchen
Retrieving, normalizing and structuring defining equations
in graph with explicit dependencies.
*)
signature CODEGEN_FUNCGR =
sig
type T
val timing: bool ref
val funcs: T -> CodegenConsts.const -> thm list
val typ: T -> CodegenConsts.const -> typ
val deps: T -> CodegenConsts.const list -> CodegenConsts.const list list
val all: T -> CodegenConsts.const list
val pretty: theory -> T -> Pretty.T
structure Constgraph : GRAPH
end
signature CODEGEN_FUNCGR_RETRIEVAL =
sig
type T (* = CODEGEN_FUNCGR.T *)
val make: theory -> CodegenConsts.const list -> T
val make_consts: theory -> CodegenConsts.const list -> CodegenConsts.const list * T
val make_term: theory -> (T -> (thm -> thm) -> cterm -> thm -> 'a) -> cterm -> 'a * T
val init: theory -> theory
end;
structure CodegenFuncgr = (*signature is added later*)
struct
(** the graph type **)
structure Constgraph = GraphFun (
type key = CodegenConsts.const;
val ord = CodegenConsts.const_ord;
);
type T = (typ * thm list) Constgraph.T;
fun funcs funcgr =
these o Option.map snd o try (Constgraph.get_node funcgr);
fun typ funcgr =
fst o Constgraph.get_node funcgr;
fun deps funcgr cs =
let
val conn = Constgraph.strong_conn funcgr;
val order = rev conn;
in
(map o filter) (member (op =) (Constgraph.all_succs funcgr cs)) order
|> filter_out null
end;
fun all funcgr = Constgraph.keys funcgr;
fun pretty thy funcgr =
AList.make (snd o Constgraph.get_node funcgr) (Constgraph.keys funcgr)
|> (map o apfst) (CodegenConsts.string_of_const thy)
|> sort (string_ord o pairself fst)
|> map (fn (s, thms) =>
(Pretty.block o Pretty.fbreaks) (
Pretty.str s
:: map Display.pretty_thm thms
))
|> Pretty.chunks;
(** generic combinators **)
fun fold_consts f thms =
thms
|> maps (op :: o swap o apfst (snd o strip_comb) o Logic.dest_equals o Drule.plain_prop_of)
|> (fold o fold_aterms) (fn Const c => f c | _ => I);
fun consts_of (const, []) = []
| consts_of (const, thms as thm :: _) =
let
val thy = Thm.theory_of_thm thm;
val is_refl = curry CodegenConsts.eq_const const;
fun the_const c = case try (CodegenConsts.const_of_cexpr thy) c
of SOME const => if is_refl const then I else insert CodegenConsts.eq_const const
| NONE => I
in fold_consts the_const thms [] end;
fun insts_of thy algebra c ty_decl ty =
let
val tys_decl = Sign.const_typargs thy (c, ty_decl);
val tys = Sign.const_typargs thy (c, ty);
fun class_relation (x, _) _ = x;
fun type_constructor tyco xs class =
(tyco, class) :: maps (maps fst) xs;
fun type_variable (TVar (_, sort)) = map (pair []) sort
| type_variable (TFree (_, sort)) = map (pair []) sort;
fun mk_inst ty (TVar (_, sort)) = cons (ty, sort)
| mk_inst ty (TFree (_, sort)) = cons (ty, sort)
| mk_inst (Type (_, tys1)) (Type (_, tys2)) = fold2 mk_inst tys1 tys2;
fun of_sort_deriv (ty, sort) =
Sorts.of_sort_derivation (Sign.pp thy) algebra
{ class_relation = class_relation, type_constructor = type_constructor,
type_variable = type_variable }
(ty, sort)
in
flat (maps of_sort_deriv (fold2 mk_inst tys tys_decl []))
end;
fun drop_classes thy tfrees thm =
let
val (_, thm') = Thm.varifyT' [] thm;
val tvars = Term.add_tvars (Thm.prop_of thm') [];
val unconstr = map (Thm.ctyp_of thy o TVar) tvars;
val instmap = map2 (fn (v_i, _) => fn (v, sort) => pairself (Thm.ctyp_of thy)
(TVar (v_i, []), TFree (v, sort))) tvars tfrees;
in
thm'
|> fold Thm.unconstrainT unconstr
|> Thm.instantiate (instmap, [])
|> Tactic.rule_by_tactic ((REPEAT o CHANGED o ALLGOALS o Tactic.resolve_tac) (AxClass.class_intros thy))
end;
(** graph algorithm **)
val timing = ref false;
local
exception INVALID of CodegenConsts.const list * string;
fun resort_thms algebra tap_typ [] = []
| resort_thms algebra tap_typ (thms as thm :: _) =
let
val thy = Thm.theory_of_thm thm;
val cs = fold_consts (insert (op =)) thms [];
fun match_const c (ty, ty_decl) =
let
val tys = CodegenConsts.typargs thy (c, ty);
val sorts = map (snd o dest_TVar) (CodegenConsts.typargs thy (c, ty_decl));
in fold2 (curry (CodegenConsts.typ_sort_inst algebra)) tys sorts end;
fun match (c_ty as (c, ty)) =
case tap_typ c_ty
of SOME ty_decl => match_const c (ty, ty_decl)
| NONE => I;
val tvars = fold match cs Vartab.empty;
in map (CodegenFunc.inst_thm tvars) thms end;
fun resort_funcss thy algebra funcgr =
let
val typ_funcgr = try (fst o Constgraph.get_node funcgr o CodegenConsts.const_of_cexpr thy);
fun resort_dep (const, thms) = (const, resort_thms algebra typ_funcgr thms)
handle Sorts.CLASS_ERROR e => raise INVALID ([const], Sorts.msg_class_error (Sign.pp thy) e
^ ",\nfor constant " ^ CodegenConsts.string_of_const thy const
^ "\nin defining equations\n"
^ (cat_lines o map string_of_thm) thms)
fun resort_rec tap_typ (const, []) = (true, (const, []))
| resort_rec tap_typ (const, thms as thm :: _) =
let
val ty = CodegenFunc.typ_func thm;
val thms' as thm' :: _ = resort_thms algebra tap_typ thms
val ty' = CodegenFunc.typ_func thm';
in (Sign.typ_equiv thy (ty, ty'), (const, thms')) end;
fun resort_recs funcss =
let
fun tap_typ c_ty = case try (CodegenConsts.const_of_cexpr thy) c_ty
of SOME const => AList.lookup (CodegenConsts.eq_const) funcss const
|> these
|> try hd
|> Option.map CodegenFunc.typ_func
| NONE => NONE;
val (unchangeds, funcss') = split_list (map (resort_rec tap_typ) funcss);
val unchanged = fold (fn x => fn y => x andalso y) unchangeds true;
in (unchanged, funcss') end;
fun resort_rec_until funcss =
let
val (unchanged, funcss') = resort_recs funcss;
in if unchanged then funcss' else resort_rec_until funcss' end;
in map resort_dep #> resort_rec_until end;
fun instances_of thy algebra insts =
let
val thy_classes = (#classes o Sorts.rep_algebra o Sign.classes_of) thy;
fun all_classops tyco class =
try (AxClass.params_of_class thy) class
|> Option.map snd
|> these
|> map (fn (c, _) => (c, SOME tyco))
in
Symtab.empty
|> fold (fn (tyco, class) =>
Symtab.map_default (tyco, []) (insert (op =) class)) insts
|> (fn tab => Symtab.fold (fn (tyco, classes) => append (maps (all_classops tyco)
(Graph.all_succs thy_classes classes))) tab [])
end;
fun instances_of_consts thy algebra funcgr consts =
let
fun inst (cexpr as (c, ty)) = insts_of thy algebra c
((fst o Constgraph.get_node funcgr o CodegenConsts.const_of_cexpr thy) cexpr)
ty handle CLASS_ERROR => [];
in
[]
|> fold (fold (insert (op =)) o inst) consts
|> instances_of thy algebra
end;
fun ensure_const' rewrites thy algebra funcgr const auxgr =
if can (Constgraph.get_node funcgr) const
then (NONE, auxgr)
else if can (Constgraph.get_node auxgr) const
then (SOME const, auxgr)
else if is_some (CodegenData.get_datatype_of_constr thy const) then
auxgr
|> Constgraph.new_node (const, [])
|> pair (SOME const)
else let
val thms = CodegenData.these_funcs thy const
|> map (CodegenFunc.rewrite_func (rewrites thy))
|> CodegenFunc.norm_args
|> CodegenFunc.norm_varnames CodegenNames.purify_tvar CodegenNames.purify_var;
val rhs = consts_of (const, thms);
in
auxgr
|> Constgraph.new_node (const, thms)
|> fold_map (ensure_const rewrites thy algebra funcgr) rhs
|-> (fn rhs' => fold (fn SOME const' => Constgraph.add_edge (const, const')
| NONE => I) rhs')
|> pair (SOME const)
end
and ensure_const rewrites thy algebra funcgr const =
let
val timeap = if !timing
then Output.timeap_msg ("time for " ^ CodegenConsts.string_of_const thy const)
else I;
in timeap (ensure_const' rewrites thy algebra funcgr const) end;
fun merge_funcss rewrites thy algebra raw_funcss funcgr =
let
val funcss = raw_funcss
|> resort_funcss thy algebra funcgr
|> filter_out (can (Constgraph.get_node funcgr) o fst);
fun typ_func const [] = CodegenData.default_typ thy const
| typ_func (_, NONE) (thm :: _) = CodegenFunc.typ_func thm
| typ_func (const as (c, SOME tyco)) (thms as (thm :: _)) =
let
val ty = CodegenFunc.typ_func thm;
val SOME class = AxClass.class_of_param thy c;
val sorts_decl = Sorts.mg_domain algebra tyco [class];
val tys = CodegenConsts.typargs thy (c, ty);
val sorts = map (snd o dest_TVar) tys;
in if sorts = sorts_decl then ty
else raise INVALID ([const], "Illegal instantation for class operation "
^ CodegenConsts.string_of_const thy const
^ "\nin defining equations\n"
^ (cat_lines o map string_of_thm) thms)
end;
fun add_funcs (const, thms) =
Constgraph.new_node (const, (typ_func const thms, thms));
fun add_deps (funcs as (const, thms)) funcgr =
let
val deps = consts_of funcs;
val insts = instances_of_consts thy algebra funcgr
(fold_consts (insert (op =)) thms []);
in
funcgr
|> ensure_consts' rewrites thy algebra insts
|> fold (curry Constgraph.add_edge const) deps
|> fold (curry Constgraph.add_edge const) insts
end;
in
funcgr
|> fold add_funcs funcss
|> fold add_deps funcss
end
and ensure_consts' rewrites thy algebra cs funcgr =
let
val auxgr = Constgraph.empty
|> fold (snd oo ensure_const rewrites thy algebra funcgr) cs;
in
funcgr
|> fold (merge_funcss rewrites thy algebra)
(map (AList.make (Constgraph.get_node auxgr))
(rev (Constgraph.strong_conn auxgr)))
end handle INVALID (cs', msg)
=> raise INVALID (fold (insert CodegenConsts.eq_const) cs' cs, msg);
fun ensure_consts rewrites thy consts funcgr =
let
val algebra = CodegenData.coregular_algebra thy
in ensure_consts' rewrites thy algebra consts funcgr
handle INVALID (cs', msg) => error (msg ^ ",\nwhile preprocessing equations for constant(s) "
^ commas (map (CodegenConsts.string_of_const thy) cs'))
end;
in
(** retrieval interfaces **)
val ensure_consts = ensure_consts;
fun check_consts rewrites thy consts funcgr =
let
val algebra = CodegenData.coregular_algebra thy;
fun try_const const funcgr =
(SOME const, ensure_consts' rewrites thy algebra [const] funcgr)
handle INVALID (cs', msg) => (NONE, funcgr);
val (consts', funcgr') = fold_map try_const consts funcgr;
in (map_filter I consts', funcgr') end;
fun ensure_consts_term rewrites thy f ct funcgr =
let
fun consts_of thy t =
fold_aterms (fn Const c => cons (CodegenConsts.const_of_cexpr thy c) | _ => I) t []
fun rhs_conv conv thm =
let
val thm' = (conv o snd o Drule.dest_equals o Thm.cprop_of) thm;
in Thm.transitive thm thm' end
val _ = Sign.no_vars (Sign.pp thy) (Thm.term_of ct);
val _ = Term.fold_types (Type.no_tvars #> K I) (Thm.term_of ct) ();
val thm1 = CodegenData.preprocess_cterm ct
|> fold (rhs_conv o MetaSimplifier.rewrite false o single) (rewrites thy);
val ct' = Drule.dest_equals_rhs (Thm.cprop_of thm1);
val consts = consts_of thy (Thm.term_of ct');
val funcgr' = ensure_consts rewrites thy consts funcgr;
val algebra = CodegenData.coregular_algebra thy;
val (_, thm2) = Thm.varifyT' [] thm1;
val thm3 = Thm.reflexive (Drule.dest_equals_rhs (Thm.cprop_of thm2));
val typ_funcgr = try (fst o Constgraph.get_node funcgr' o CodegenConsts.const_of_cexpr thy);
val [thm4] = resort_thms algebra typ_funcgr [thm3];
val tfrees = Term.add_tfrees (Thm.prop_of thm1) [];
fun inst thm =
let
val tvars = Term.add_tvars (Thm.prop_of thm) [];
val instmap = map2 (fn (v_i, sort) => fn (v, _) => pairself (Thm.ctyp_of thy)
(TVar (v_i, sort), TFree (v, sort))) tvars tfrees;
in Thm.instantiate (instmap, []) thm end;
val thm5 = inst thm2;
val thm6 = inst thm4;
val ct'' = Drule.dest_equals_rhs (Thm.cprop_of thm6);
val cs = fold_aterms (fn Const c => cons c | _ => I) (Thm.term_of ct'') [];
val drop = drop_classes thy tfrees;
val instdefs = instances_of_consts thy algebra funcgr' cs;
val funcgr'' = ensure_consts rewrites thy instdefs funcgr';
in (f funcgr'' drop ct'' thm5, funcgr'') end;
end; (*local*)
end; (*struct*)
functor CodegenFuncgrRetrieval (val name: string; val rewrites: theory -> thm list) : CODEGEN_FUNCGR_RETRIEVAL =
struct
(** code data **)
type T = CodegenFuncgr.T;
structure Funcgr = CodeDataFun
(struct
val name = name;
type T = T;
val empty = CodegenFuncgr.Constgraph.empty;
fun merge _ _ = CodegenFuncgr.Constgraph.empty;
fun purge _ NONE _ = CodegenFuncgr.Constgraph.empty
| purge _ (SOME cs) funcgr =
CodegenFuncgr.Constgraph.del_nodes ((CodegenFuncgr.Constgraph.all_preds funcgr
o filter (can (CodegenFuncgr.Constgraph.get_node funcgr))) cs) funcgr;
end);
fun make thy =
Funcgr.change thy o CodegenFuncgr.ensure_consts rewrites thy;
fun make_consts thy =
Funcgr.change_yield thy o CodegenFuncgr.check_consts rewrites thy;
fun make_term thy f =
Funcgr.change_yield thy o CodegenFuncgr.ensure_consts_term rewrites thy f;
val init = Funcgr.init;
end; (*functor*)
structure CodegenFuncgr : CODEGEN_FUNCGR =
struct
open CodegenFuncgr;
end; (*struct*)