(* Title: HOL/SPARK/Tools/spark_vcs.ML
Author: Stefan Berghofer
Copyright: secunet Security Networks AG
Store for verification conditions generated by SPARK/Ada.
*)
signature SPARK_VCS =
sig
val set_vcs: Fdl_Parser.decls -> Fdl_Parser.rules ->
(string * string) * Fdl_Parser.vcs -> Path.T -> string -> theory -> theory
val add_proof_fun: (typ option -> 'a -> term) ->
string * ((string list * string) option * 'a) ->
theory -> theory
val add_type: string * typ -> theory -> theory
val lookup_vc: theory -> string -> (Element.context_i list *
(string * thm list option * Element.context_i * Element.statement_i)) option
val get_vcs: theory ->
Element.context_i list * (binding * thm) list * (string *
(string * thm list option * Element.context_i * Element.statement_i)) list
val mark_proved: string -> thm list -> theory -> theory
val close: theory -> theory
val is_closed: theory -> bool
end;
structure SPARK_VCs: SPARK_VCS =
struct
open Fdl_Parser;
(** theory data **)
fun err_unfinished () = error "An unfinished SPARK environment is still open."
val strip_number = pairself implode o take_suffix Fdl_Lexer.is_digit o raw_explode;
val name_ord = prod_ord string_ord (option_ord int_ord) o
pairself (strip_number ##> Int.fromString);
structure VCtab = Table(type key = string val ord = name_ord);
structure VCs = Theory_Data
(
type T =
{pfuns: ((string list * string) option * term) Symtab.table,
type_map: typ Symtab.table,
env:
{ctxt: Element.context_i list,
defs: (binding * thm) list,
types: fdl_type tab,
funs: (string list * string) tab,
ids: (term * string) Symtab.table * Name.context,
proving: bool,
vcs: (string * thm list option *
(string * expr) list * (string * expr) list) VCtab.table,
path: Path.T,
prefix: string} option}
val empty : T = {pfuns = Symtab.empty, type_map = Symtab.empty, env = NONE}
val extend = I
fun merge ({pfuns = pfuns1, type_map = type_map1, env = NONE},
{pfuns = pfuns2, type_map = type_map2, env = NONE}) =
{pfuns = Symtab.merge (eq_pair (op =) (op aconv)) (pfuns1, pfuns2),
type_map = Symtab.merge (op =) (type_map1, type_map2),
env = NONE}
| merge _ = err_unfinished ()
)
(** utilities **)
val to_lower = raw_explode #> map Symbol.to_ascii_lower #> implode;
val lcase_eq = (op =) o pairself (to_lower o Long_Name.base_name);
fun lookup_prfx "" tab s = Symtab.lookup tab s
| lookup_prfx prfx tab s = (case Symtab.lookup tab s of
NONE => Symtab.lookup tab (prfx ^ "__" ^ s)
| x => x);
fun strip_prfx s =
let
fun strip ys [] = ("", implode ys)
| strip ys ("_" :: "_" :: xs) = (implode (rev xs), implode ys)
| strip ys (x :: xs) = strip (x :: ys) xs
in strip [] (rev (raw_explode s)) end;
fun mk_unop s t =
let val T = fastype_of t
in Const (s, T --> T) $ t end;
fun mk_times (t, u) =
let
val setT = fastype_of t;
val T = HOLogic.dest_setT setT;
val U = HOLogic.dest_setT (fastype_of u)
in
Const (@{const_name Sigma}, setT --> (T --> HOLogic.mk_setT U) -->
HOLogic.mk_setT (HOLogic.mk_prodT (T, U))) $ t $ Abs ("", T, u)
end;
fun get_type thy prfx ty =
let val {type_map, ...} = VCs.get thy
in lookup_prfx prfx type_map ty end;
fun mk_type _ _ "integer" = HOLogic.intT
| mk_type _ _ "boolean" = HOLogic.boolT
| mk_type thy prfx ty =
(case get_type thy prfx ty of
NONE =>
Syntax.check_typ (Proof_Context.init_global thy)
(Type (Sign.full_name thy (Binding.name ty), []))
| SOME T => T);
val booleanN = "boolean";
val integerN = "integer";
fun define_overloaded (def_name, eq) lthy =
let
val ((c, _), rhs) = eq |> Syntax.check_term lthy |>
Logic.dest_equals |>> dest_Free;
val ((_, (_, thm)), lthy') = Local_Theory.define
((Binding.name c, NoSyn), ((Binding.name def_name, []), rhs)) lthy
val ctxt_thy = Proof_Context.init_global (Proof_Context.theory_of lthy');
val thm' = singleton (Proof_Context.export lthy' ctxt_thy) thm
in (thm', lthy') end;
fun strip_underscores s =
strip_underscores (unsuffix "_" s) handle Fail _ => s;
fun strip_tilde s =
unsuffix "~" s ^ "_init" handle Fail _ => s;
val mangle_name = strip_underscores #> strip_tilde;
fun mk_variables thy prfx xs ty (tab, ctxt) =
let
val T = mk_type thy prfx ty;
val (ys, ctxt') = fold_map Name.variant (map mangle_name xs) ctxt;
val zs = map (Free o rpair T) ys;
in (zs, (fold (Symtab.update o apsnd (rpair ty)) (xs ~~ zs) tab, ctxt')) end;
fun get_record_info thy T = (case Record.dest_recTs T of
[(tyname, [@{typ unit}])] =>
Record.get_info thy (Long_Name.qualifier tyname)
| _ => NONE);
fun find_field fname = find_first (curry lcase_eq fname o fst);
fun find_field' fname = get_first (fn (flds, fldty) =>
if member (op =) flds fname then SOME fldty else NONE);
fun assoc_ty_err thy T s msg =
error ("Type " ^ Syntax.string_of_typ_global thy T ^
" associated with SPARK type " ^ s ^ "\n" ^ msg);
(** generate properties of enumeration types **)
fun add_enum_type tyname tyname' thy =
let
val {case_name, ...} = the (Datatype_Data.get_info thy tyname');
val cs = map Const (the (Datatype_Data.get_constrs thy tyname'));
val k = length cs;
val T = Type (tyname', []);
val p = Const (@{const_name pos}, T --> HOLogic.intT);
val v = Const (@{const_name val}, HOLogic.intT --> T);
val card = Const (@{const_name card},
HOLogic.mk_setT T --> HOLogic.natT) $ HOLogic.mk_UNIV T;
fun mk_binrel_def s f = Logic.mk_equals
(Const (s, T --> T --> HOLogic.boolT),
Abs ("x", T, Abs ("y", T,
Const (s, HOLogic.intT --> HOLogic.intT --> HOLogic.boolT) $
(f $ Bound 1) $ (f $ Bound 0))));
val (((def1, def2), def3), lthy) = thy |>
Class.instantiation ([tyname'], [], @{sort spark_enum}) |>
define_overloaded ("pos_" ^ tyname ^ "_def", Logic.mk_equals
(p,
list_comb (Const (case_name, replicate k HOLogic.intT @
[T] ---> HOLogic.intT),
map (HOLogic.mk_number HOLogic.intT) (0 upto k - 1)))) ||>>
define_overloaded ("less_eq_" ^ tyname ^ "_def",
mk_binrel_def @{const_name less_eq} p) ||>>
define_overloaded ("less_" ^ tyname ^ "_def",
mk_binrel_def @{const_name less} p);
val UNIV_eq = Goal.prove lthy [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq
(HOLogic.mk_UNIV T, HOLogic.mk_set T cs)))
(fn _ =>
rtac @{thm subset_antisym} 1 THEN
rtac @{thm subsetI} 1 THEN
Datatype_Aux.exh_tac (K (#exhaust (Datatype_Data.the_info
(Proof_Context.theory_of lthy) tyname'))) 1 THEN
ALLGOALS (asm_full_simp_tac (simpset_of lthy)));
val finite_UNIV = Goal.prove lthy [] []
(HOLogic.mk_Trueprop (Const (@{const_name finite},
HOLogic.mk_setT T --> HOLogic.boolT) $ HOLogic.mk_UNIV T))
(fn _ => simp_tac (simpset_of lthy addsimps [UNIV_eq]) 1);
val card_UNIV = Goal.prove lthy [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq
(card, HOLogic.mk_number HOLogic.natT k)))
(fn _ => simp_tac (simpset_of lthy addsimps [UNIV_eq]) 1);
val range_pos = Goal.prove lthy [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq
(Const (@{const_name image}, (T --> HOLogic.intT) -->
HOLogic.mk_setT T --> HOLogic.mk_setT HOLogic.intT) $
p $ HOLogic.mk_UNIV T,
Const (@{const_name atLeastLessThan}, HOLogic.intT -->
HOLogic.intT --> HOLogic.mk_setT HOLogic.intT) $
HOLogic.mk_number HOLogic.intT 0 $
(@{term int} $ card))))
(fn _ =>
simp_tac (simpset_of lthy addsimps [card_UNIV]) 1 THEN
simp_tac (simpset_of lthy addsimps [UNIV_eq, def1]) 1 THEN
rtac @{thm subset_antisym} 1 THEN
simp_tac (simpset_of lthy) 1 THEN
rtac @{thm subsetI} 1 THEN
asm_full_simp_tac (simpset_of lthy addsimps @{thms interval_expand}
delsimps @{thms atLeastLessThan_iff}) 1);
val lthy' =
Class.prove_instantiation_instance (fn _ =>
Class.intro_classes_tac [] THEN
rtac finite_UNIV 1 THEN
rtac range_pos 1 THEN
simp_tac (HOL_basic_ss addsimps [def3]) 1 THEN
simp_tac (HOL_basic_ss addsimps [def2]) 1) lthy;
val (pos_eqs, val_eqs) = split_list (map_index (fn (i, c) =>
let
val n = HOLogic.mk_number HOLogic.intT i;
val th = Goal.prove lthy' [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq (p $ c, n)))
(fn _ => simp_tac (simpset_of lthy' addsimps [def1]) 1);
val th' = Goal.prove lthy' [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq (v $ n, c)))
(fn _ =>
rtac (@{thm inj_pos} RS @{thm injD}) 1 THEN
simp_tac (simpset_of lthy' addsimps
[@{thm pos_val}, range_pos, card_UNIV, th]) 1)
in (th, th') end) cs);
val first_el = Goal.prove lthy' [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq
(Const (@{const_name first_el}, T), hd cs)))
(fn _ => simp_tac (simpset_of lthy' addsimps
[@{thm first_el_def}, hd val_eqs]) 1);
val last_el = Goal.prove lthy' [] []
(HOLogic.mk_Trueprop (HOLogic.mk_eq
(Const (@{const_name last_el}, T), List.last cs)))
(fn _ => simp_tac (simpset_of lthy' addsimps
[@{thm last_el_def}, List.last val_eqs, card_UNIV]) 1);
in
lthy' |>
Local_Theory.note
((Binding.name (tyname ^ "_card"), @{attributes [simp]}), [card_UNIV]) ||>>
Local_Theory.note
((Binding.name (tyname ^ "_pos"), @{attributes [simp]}), pos_eqs) ||>>
Local_Theory.note
((Binding.name (tyname ^ "_val"), @{attributes [simp]}), val_eqs) ||>>
Local_Theory.note
((Binding.name (tyname ^ "_first_el"), @{attributes [simp]}), [first_el]) ||>>
Local_Theory.note
((Binding.name (tyname ^ "_last_el"), @{attributes [simp]}), [last_el]) |> snd |>
Local_Theory.exit_global
end;
fun check_no_assoc thy prfx s = case get_type thy prfx s of
NONE => ()
| SOME _ => error ("Cannot associate a type with " ^ s ^
"\nsince it is no record or enumeration type");
fun check_enum [] [] = NONE
| check_enum els [] = SOME ("has no element(s) " ^ commas els)
| check_enum [] cs = SOME ("has extra element(s) " ^
commas (map (Long_Name.base_name o fst) cs))
| check_enum (el :: els) ((cname, _) :: cs) =
if lcase_eq (el, cname) then check_enum els cs
else SOME ("either has no element " ^ el ^
" or it is at the wrong position");
fun add_type_def prfx (s, Basic_Type ty) (ids, thy) =
(check_no_assoc thy prfx s;
(ids,
Typedecl.abbrev_global (Binding.name s, [], NoSyn)
(mk_type thy prfx ty) thy |> snd))
| add_type_def prfx (s, Enum_Type els) ((tab, ctxt), thy) =
let
val (thy', tyname) = (case get_type thy prfx s of
NONE =>
let
val tyb = Binding.name s;
val tyname = Sign.full_name thy tyb
in
(thy |>
Datatype.add_datatype {strict = true, quiet = true} [s]
[([], tyb, NoSyn,
map (fn s => (Binding.name s, [], NoSyn)) els)] |> snd |>
add_enum_type s tyname,
tyname)
end
| SOME (T as Type (tyname, [])) =>
(case Datatype_Data.get_constrs thy tyname of
NONE => assoc_ty_err thy T s "is not a datatype"
| SOME cs =>
let
val (prfx', _) = strip_prfx s;
val els' =
if prfx' = "" then els
else map (unprefix (prfx' ^ "__")) els
handle Fail _ => error ("Bad enumeration type " ^ s)
in
case check_enum els' cs of
NONE => (thy, tyname)
| SOME msg => assoc_ty_err thy T s msg
end));
val cs = map Const (the (Datatype_Data.get_constrs thy' tyname))
in
((fold (Symtab.update_new o apsnd (rpair s)) (els ~~ cs) tab,
fold Name.declare els ctxt),
thy')
end
| add_type_def prfx (s, Array_Type (argtys, resty)) (ids, thy) =
(check_no_assoc thy prfx s;
(ids,
Typedecl.abbrev_global (Binding.name s, [], NoSyn)
(foldr1 HOLogic.mk_prodT (map (mk_type thy prfx) argtys) -->
mk_type thy prfx resty) thy |> snd))
| add_type_def prfx (s, Record_Type fldtys) (ids, thy) =
(ids,
let val fldTs = maps (fn (flds, ty) =>
map (rpair (mk_type thy prfx ty)) flds) fldtys
in case get_type thy prfx s of
NONE =>
Record.add_record ([], Binding.name s) NONE
(map (fn (fld, T) => (Binding.name fld, T, NoSyn)) fldTs) thy
| SOME rT =>
(case get_record_info thy rT of
NONE => assoc_ty_err thy rT s "is not a record type"
| SOME {fields, ...} =>
(case subtract (lcase_eq o pairself fst) fldTs fields of
[] => ()
| flds => assoc_ty_err thy rT s ("has extra field(s) " ^
commas (map (Long_Name.base_name o fst) flds));
map (fn (fld, T) =>
case AList.lookup lcase_eq fields fld of
NONE => assoc_ty_err thy rT s ("has no field " ^ fld)
| SOME U => T = U orelse assoc_ty_err thy rT s
("has field " ^
fld ^ " whose type\n" ^
Syntax.string_of_typ_global thy U ^
"\ndoes not match declared type\n" ^
Syntax.string_of_typ_global thy T)) fldTs;
thy))
end)
| add_type_def prfx (s, Pending_Type) (ids, thy) =
(ids,
case get_type thy prfx s of
SOME _ => thy
| NONE => Typedecl.typedecl_global
(Binding.name s, [], NoSyn) thy |> snd);
fun term_of_expr thy prfx types pfuns =
let
fun tm_of vs (Funct ("->", [e, e'])) =
(HOLogic.mk_imp (fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct ("<->", [e, e'])) =
(HOLogic.mk_eq (fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct ("or", [e, e'])) =
(HOLogic.mk_disj (fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct ("and", [e, e'])) =
(HOLogic.mk_conj (fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct ("not", [e])) =
(HOLogic.mk_not (fst (tm_of vs e)), booleanN)
| tm_of vs (Funct ("=", [e, e'])) =
(HOLogic.mk_eq (fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct ("<>", [e, e'])) = (HOLogic.mk_not
(HOLogic.mk_eq (fst (tm_of vs e), fst (tm_of vs e'))), booleanN)
| tm_of vs (Funct ("<", [e, e'])) = (HOLogic.mk_binrel @{const_name less}
(fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct (">", [e, e'])) = (HOLogic.mk_binrel @{const_name less}
(fst (tm_of vs e'), fst (tm_of vs e)), booleanN)
| tm_of vs (Funct ("<=", [e, e'])) = (HOLogic.mk_binrel @{const_name less_eq}
(fst (tm_of vs e), fst (tm_of vs e')), booleanN)
| tm_of vs (Funct (">=", [e, e'])) = (HOLogic.mk_binrel @{const_name less_eq}
(fst (tm_of vs e'), fst (tm_of vs e)), booleanN)
| tm_of vs (Funct ("+", [e, e'])) = (HOLogic.mk_binop @{const_name plus}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("-", [e, e'])) = (HOLogic.mk_binop @{const_name minus}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("*", [e, e'])) = (HOLogic.mk_binop @{const_name times}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("/", [e, e'])) = (HOLogic.mk_binop @{const_name divide}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("div", [e, e'])) = (HOLogic.mk_binop @{const_name sdiv}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("mod", [e, e'])) = (HOLogic.mk_binop @{const_name mod}
(fst (tm_of vs e), fst (tm_of vs e')), integerN)
| tm_of vs (Funct ("-", [e])) =
(mk_unop @{const_name uminus} (fst (tm_of vs e)), integerN)
| tm_of vs (Funct ("**", [e, e'])) =
(Const (@{const_name power}, HOLogic.intT --> HOLogic.natT -->
HOLogic.intT) $ fst (tm_of vs e) $
(@{const nat} $ fst (tm_of vs e')), integerN)
| tm_of (tab, _) (Ident s) =
(case Symtab.lookup tab s of
SOME t_ty => t_ty
| NONE => (case lookup_prfx prfx pfuns s of
SOME (SOME ([], resty), t) => (t, resty)
| _ => error ("Undeclared identifier " ^ s)))
| tm_of _ (Number i) = (HOLogic.mk_number HOLogic.intT i, integerN)
| tm_of vs (Quantifier (s, xs, ty, e)) =
let
val (ys, vs') = mk_variables thy prfx xs ty vs;
val q = (case s of
"for_all" => HOLogic.mk_all
| "for_some" => HOLogic.mk_exists)
in
(fold_rev (fn Free (x, T) => fn t => q (x, T, t))
ys (fst (tm_of vs' e)),
booleanN)
end
| tm_of vs (Funct (s, es)) =
(* record field selection *)
(case try (unprefix "fld_") s of
SOME fname => (case es of
[e] =>
let
val (t, rcdty) = tm_of vs e;
val rT = mk_type thy prfx rcdty
in case (get_record_info thy rT, lookup types rcdty) of
(SOME {fields, ...}, SOME (Record_Type fldtys)) =>
(case (find_field fname fields,
find_field' fname fldtys) of
(SOME (fname', fT), SOME fldty) =>
(Const (fname', rT --> fT) $ t, fldty)
| _ => error ("Record " ^ rcdty ^
" has no field named " ^ fname))
| _ => error (rcdty ^ " is not a record type")
end
| _ => error ("Function " ^ s ^ " expects one argument"))
| NONE =>
(* record field update *)
(case try (unprefix "upf_") s of
SOME fname => (case es of
[e, e'] =>
let
val (t, rcdty) = tm_of vs e;
val rT = mk_type thy prfx rcdty;
val (u, fldty) = tm_of vs e';
val fT = mk_type thy prfx fldty
in case get_record_info thy rT of
SOME {fields, ...} =>
(case find_field fname fields of
SOME (fname', fU) =>
if fT = fU then
(Const (fname' ^ "_update",
(fT --> fT) --> rT --> rT) $
Abs ("x", fT, u) $ t,
rcdty)
else error ("Type\n" ^
Syntax.string_of_typ_global thy fT ^
"\ndoes not match type\n" ^
Syntax.string_of_typ_global thy fU ^
"\nof field " ^ fname)
| NONE => error ("Record " ^ rcdty ^
" has no field named " ^ fname))
| _ => error (rcdty ^ " is not a record type")
end
| _ => error ("Function " ^ s ^ " expects two arguments"))
| NONE =>
(* enumeration type to integer *)
(case try (unsuffix "__pos") s of
SOME tyname => (case es of
[e] => (Const (@{const_name pos},
mk_type thy prfx tyname --> HOLogic.intT) $ fst (tm_of vs e),
integerN)
| _ => error ("Function " ^ s ^ " expects one argument"))
| NONE =>
(* integer to enumeration type *)
(case try (unsuffix "__val") s of
SOME tyname => (case es of
[e] => (Const (@{const_name val},
HOLogic.intT --> mk_type thy prfx tyname) $ fst (tm_of vs e),
tyname)
| _ => error ("Function " ^ s ^ " expects one argument"))
| NONE =>
(* successor / predecessor of enumeration type element *)
if s = "succ" orelse s = "pred" then (case es of
[e] =>
let
val (t, tyname) = tm_of vs e;
val T = mk_type thy prfx tyname
in (Const
(if s = "succ" then @{const_name succ}
else @{const_name pred}, T --> T) $ t, tyname)
end
| _ => error ("Function " ^ s ^ " expects one argument"))
(* user-defined proof function *)
else
(case lookup_prfx prfx pfuns s of
SOME (SOME (_, resty), t) =>
(list_comb (t, map (fst o tm_of vs) es), resty)
| _ => error ("Undeclared proof function " ^ s))))))
| tm_of vs (Element (e, es)) =
let val (t, ty) = tm_of vs e
in case lookup types ty of
SOME (Array_Type (_, elty)) =>
(t $ foldr1 HOLogic.mk_prod (map (fst o tm_of vs) es), elty)
| _ => error (ty ^ " is not an array type")
end
| tm_of vs (Update (e, es, e')) =
let val (t, ty) = tm_of vs e
in case lookup types ty of
SOME (Array_Type (idxtys, elty)) =>
let
val T = foldr1 HOLogic.mk_prodT
(map (mk_type thy prfx) idxtys);
val U = mk_type thy prfx elty;
val fT = T --> U
in
(Const (@{const_name fun_upd}, fT --> T --> U --> fT) $
t $ foldr1 HOLogic.mk_prod (map (fst o tm_of vs) es) $
fst (tm_of vs e'),
ty)
end
| _ => error (ty ^ " is not an array type")
end
| tm_of vs (Record (s, flds)) =
let
val T = mk_type thy prfx s;
val {extension = (ext_name, _), fields, ...} =
(case get_record_info thy T of
NONE => error (s ^ " is not a record type")
| SOME info => info);
val flds' = map (apsnd (tm_of vs)) flds;
val fnames = map (Long_Name.base_name o fst) fields;
val fnames' = map fst flds;
val (fvals, ftys) = split_list (map (fn s' =>
case AList.lookup lcase_eq flds' s' of
SOME fval_ty => fval_ty
| NONE => error ("Field " ^ s' ^ " missing in record " ^ s))
fnames);
val _ = (case subtract lcase_eq fnames fnames' of
[] => ()
| xs => error ("Extra field(s) " ^ commas xs ^
" in record " ^ s));
val _ = (case duplicates (op =) fnames' of
[] => ()
| xs => error ("Duplicate field(s) " ^ commas xs ^
" in record " ^ s))
in
(list_comb
(Const (ext_name,
map (mk_type thy prfx) ftys @ [HOLogic.unitT] ---> T),
fvals @ [HOLogic.unit]),
s)
end
| tm_of vs (Array (s, default, assocs)) =
(case lookup types s of
SOME (Array_Type (idxtys, elty)) =>
let
val Ts = map (mk_type thy prfx) idxtys;
val T = foldr1 HOLogic.mk_prodT Ts;
val U = mk_type thy prfx elty;
fun mk_idx' T (e, NONE) = HOLogic.mk_set T [fst (tm_of vs e)]
| mk_idx' T (e, SOME e') = Const (@{const_name atLeastAtMost},
T --> T --> HOLogic.mk_setT T) $
fst (tm_of vs e) $ fst (tm_of vs e');
fun mk_idx idx =
if length Ts <> length idx then
error ("Arity mismatch in construction of array " ^ s)
else foldr1 mk_times (map2 mk_idx' Ts idx);
fun mk_upd (idxs, e) t =
if length idxs = 1 andalso forall (is_none o snd) (hd idxs)
then
Const (@{const_name fun_upd}, (T --> U) -->
T --> U --> T --> U) $ t $
foldl1 HOLogic.mk_prod
(map (fst o tm_of vs o fst) (hd idxs)) $
fst (tm_of vs e)
else
Const (@{const_name fun_upds}, (T --> U) -->
HOLogic.mk_setT T --> U --> T --> U) $ t $
foldl1 (HOLogic.mk_binop @{const_name sup})
(map mk_idx idxs) $
fst (tm_of vs e)
in
(fold mk_upd assocs
(case default of
SOME e => Abs ("x", T, fst (tm_of vs e))
| NONE => Const (@{const_name undefined}, T --> U)),
s)
end
| _ => error (s ^ " is not an array type"))
in tm_of end;
fun term_of_rule thy prfx types pfuns ids rule =
let val tm_of = fst o term_of_expr thy prfx types pfuns ids
in case rule of
Inference_Rule (es, e) => Logic.list_implies
(map (HOLogic.mk_Trueprop o tm_of) es, HOLogic.mk_Trueprop (tm_of e))
| Substitution_Rule (es, e, e') => Logic.list_implies
(map (HOLogic.mk_Trueprop o tm_of) es,
HOLogic.mk_Trueprop (HOLogic.mk_eq (tm_of e, tm_of e')))
end;
val builtin = Symtab.make (map (rpair ())
["->", "<->", "or", "and", "not", "=", "<>", "<", ">", "<=", ">=",
"+", "-", "*", "/", "div", "mod", "**"]);
fun complex_expr (Number _) = false
| complex_expr (Ident _) = false
| complex_expr (Funct (s, es)) =
not (Symtab.defined builtin s) orelse exists complex_expr es
| complex_expr (Quantifier (_, _, _, e)) = complex_expr e
| complex_expr _ = true;
fun complex_rule (Inference_Rule (es, e)) =
complex_expr e orelse exists complex_expr es
| complex_rule (Substitution_Rule (es, e, e')) =
complex_expr e orelse complex_expr e' orelse
exists complex_expr es;
val is_pfun =
Symtab.defined builtin orf
can (unprefix "fld_") orf can (unprefix "upf_") orf
can (unsuffix "__pos") orf can (unsuffix "__val") orf
equal "succ" orf equal "pred";
fun fold_opt f = the_default I o Option.map f;
fun fold_pair f g (x, y) = f x #> g y;
fun fold_expr f g (Funct (s, es)) = f s #> fold (fold_expr f g) es
| fold_expr f g (Ident s) = g s
| fold_expr f g (Number _) = I
| fold_expr f g (Quantifier (_, _, _, e)) = fold_expr f g e
| fold_expr f g (Element (e, es)) =
fold_expr f g e #> fold (fold_expr f g) es
| fold_expr f g (Update (e, es, e')) =
fold_expr f g e #> fold (fold_expr f g) es #> fold_expr f g e'
| fold_expr f g (Record (_, flds)) = fold (fold_expr f g o snd) flds
| fold_expr f g (Array (_, default, assocs)) =
fold_opt (fold_expr f g) default #>
fold (fold_pair
(fold (fold (fold_pair
(fold_expr f g) (fold_opt (fold_expr f g)))))
(fold_expr f g)) assocs;
fun add_expr_pfuns funs = fold_expr
(fn s => if is_pfun s then I else insert (op =) s)
(fn s => if is_none (lookup funs s) then I else insert (op =) s);
val add_expr_idents = fold_expr (K I) (insert (op =));
fun pfun_type thy prfx (argtys, resty) =
map (mk_type thy prfx) argtys ---> mk_type thy prfx resty;
fun check_pfun_type thy prfx s t optty1 optty2 =
let
val T = fastype_of t;
fun check ty =
let val U = pfun_type thy prfx ty
in
T = U orelse
error ("Type\n" ^
Syntax.string_of_typ_global thy T ^
"\nof function " ^
Syntax.string_of_term_global thy t ^
" associated with proof function " ^ s ^
"\ndoes not match declared type\n" ^
Syntax.string_of_typ_global thy U)
end
in (Option.map check optty1; Option.map check optty2; ()) end;
fun upd_option x y = if is_some x then x else y;
fun check_pfuns_types thy prfx funs =
Symtab.map (fn s => fn (optty, t) =>
let val optty' = lookup funs
(if prfx = "" then s
else unprefix (prfx ^ "__") s handle Fail _ => s)
in
(check_pfun_type thy prfx s t optty optty';
(NONE |> upd_option optty |> upd_option optty', t))
end);
(** the VC store **)
fun err_vcs names = error (Pretty.string_of
(Pretty.big_list "The following verification conditions have not been proved:"
(map Pretty.str names)))
fun set_env (env as {funs, prefix, ...}) thy = VCs.map (fn
{pfuns, type_map, env = NONE} =>
{pfuns = check_pfuns_types thy prefix funs pfuns,
type_map = type_map,
env = SOME env}
| _ => err_unfinished ()) thy;
fun mk_pat s = (case Int.fromString s of
SOME i => [HOLogic.mk_Trueprop (Var (("C", i), HOLogic.boolT))]
| NONE => error ("Bad conclusion identifier: C" ^ s));
fun mk_vc thy prfx types pfuns ids (tr, proved, ps, cs) =
let val prop_of =
HOLogic.mk_Trueprop o fst o term_of_expr thy prfx types pfuns ids
in
(tr, proved,
Element.Assumes (map (fn (s', e) =>
((Binding.name ("H" ^ s'), []), [(prop_of e, [])])) ps),
Element.Shows (map (fn (s', e) =>
(Attrib.empty_binding, [(prop_of e, mk_pat s')])) cs))
end;
fun fold_vcs f vcs =
VCtab.fold (fn (_, (_, _, ps, cs)) => fold f ps #> fold f cs) vcs;
fun pfuns_of_vcs prfx funs pfuns vcs =
fold_vcs (add_expr_pfuns funs o snd) vcs [] |>
filter (is_none o lookup_prfx prfx pfuns);
fun declare_missing_pfuns thy prfx funs pfuns vcs (tab, ctxt) =
let
val (fs, (tys, Ts)) =
pfuns_of_vcs prfx funs pfuns vcs |>
map_filter (fn s => lookup funs s |>
Option.map (fn ty => (s, (SOME ty, pfun_type thy prfx ty)))) |>
split_list ||> split_list;
val (fs', ctxt') = fold_map Name.variant fs ctxt
in
(fold Symtab.update_new (fs ~~ (tys ~~ map Free (fs' ~~ Ts))) pfuns,
Element.Fixes (map2 (fn s => fn T =>
(Binding.name s, SOME T, NoSyn)) fs' Ts),
(tab, ctxt'))
end;
fun add_proof_fun prep (s, (optty, raw_t)) thy =
VCs.map (fn
{env = SOME {proving = true, ...}, ...} => err_unfinished ()
| {pfuns, type_map, env} =>
let
val (optty', prfx) = (case env of
SOME {funs, prefix, ...} => (lookup funs s, prefix)
| NONE => (NONE, ""));
val optty'' = NONE |> upd_option optty |> upd_option optty';
val t = prep (Option.map (pfun_type thy prfx) optty'') raw_t;
val _ = (case fold_aterms (fn u =>
if is_Var u orelse is_Free u then insert (op =) u else I) t [] of
[] => ()
| ts => error ("Term\n" ^ Syntax.string_of_term_global thy t ^
"\nto be associated with proof function " ^ s ^
" contains free variable(s) " ^
commas (map (Syntax.string_of_term_global thy) ts)));
in
(check_pfun_type thy prfx s t optty optty';
if is_some optty'' orelse is_none env then
{pfuns = Symtab.update_new (s, (optty'', t)) pfuns,
type_map = type_map,
env = env}
handle Symtab.DUP _ => error ("Proof function " ^ s ^
" already associated with function")
else error ("Undeclared proof function " ^ s))
end) thy;
fun add_type (s, T as Type (tyname, Ts)) thy =
thy |>
VCs.map (fn
{env = SOME _, ...} => err_unfinished ()
| {pfuns, type_map, env} =>
{pfuns = pfuns,
type_map = Symtab.update_new (s, T) type_map,
env = env}
handle Symtab.DUP _ => error ("SPARK type " ^ s ^
" already associated with type")) |>
(fn thy' =>
case Datatype_Data.get_constrs thy' tyname of
NONE => thy'
| SOME cs =>
if null Ts then
(map
(fn (_, Type (_, [])) => ()
| (cname, _) => assoc_ty_err thy T s
("has illegal constructor " ^
Long_Name.base_name cname)) cs;
add_enum_type s tyname thy')
else assoc_ty_err thy T s "is illegal")
| add_type (s, T) thy = assoc_ty_err thy T s "is illegal";
val is_closed = is_none o #env o VCs.get;
fun lookup_vc thy name =
(case VCs.get thy of
{env = SOME {vcs, types, funs, ids, ctxt, prefix, ...}, pfuns, ...} =>
(case VCtab.lookup vcs name of
SOME vc =>
let val (pfuns', ctxt', ids') =
declare_missing_pfuns thy prefix funs pfuns vcs ids
in SOME (ctxt @ [ctxt'], mk_vc thy prefix types pfuns' ids' vc) end
| NONE => NONE)
| _ => NONE);
fun get_vcs thy = (case VCs.get thy of
{env = SOME {vcs, types, funs, ids, ctxt, defs, prefix, ...}, pfuns, ...} =>
let val (pfuns', ctxt', ids') =
declare_missing_pfuns thy prefix funs pfuns vcs ids
in
(ctxt @ [ctxt'], defs,
VCtab.dest vcs |>
map (apsnd (mk_vc thy prefix types pfuns' ids')))
end
| _ => ([], [], []));
fun mark_proved name thms = VCs.map (fn
{pfuns, type_map,
env = SOME {ctxt, defs, types, funs, ids, vcs, path, prefix, ...}} =>
{pfuns = pfuns,
type_map = type_map,
env = SOME {ctxt = ctxt, defs = defs,
types = types, funs = funs, ids = ids,
proving = true,
vcs = VCtab.map_entry name (fn (trace, _, ps, cs) =>
(trace, SOME thms, ps, cs)) vcs,
path = path,
prefix = prefix}}
| x => x);
fun close thy =
thy |>
VCs.map (fn
{pfuns, type_map, env = SOME {vcs, path, ...}} =>
(case VCtab.fold_rev (fn vc as (_, (_, p, _, _)) =>
(if is_some p then apfst else apsnd) (cons vc)) vcs ([], []) of
(proved, []) =>
(Thm.join_proofs (maps (the o #2 o snd) proved);
File.write (Path.ext "prv" path)
(implode (map (fn (s, _) => snd (strip_number s) ^
" -- proved by " ^ Distribution.version ^ "\n") proved));
{pfuns = pfuns, type_map = type_map, env = NONE})
| (_, unproved) => err_vcs (map fst unproved))
| _ => error "No SPARK environment is currently open") |>
Sign.parent_path;
(** set up verification conditions **)
fun partition_opt f =
let
fun part ys zs [] = (rev ys, rev zs)
| part ys zs (x :: xs) = (case f x of
SOME y => part (y :: ys) zs xs
| NONE => part ys (x :: zs) xs)
in part [] [] end;
fun dest_def (id, (Substitution_Rule ([], Ident s, rhs))) = SOME (id, (s, rhs))
| dest_def _ = NONE;
fun mk_rulename (s, i) = Binding.name (s ^ string_of_int i);
fun add_const prfx (s, ty) ((tab, ctxt), thy) =
let
val T = mk_type thy prfx ty;
val b = Binding.name s;
val c = Const (Sign.full_name thy b, T)
in
(c,
((Symtab.update (s, (c, ty)) tab, Name.declare s ctxt),
Sign.add_consts_i [(b, T, NoSyn)] thy))
end;
fun add_def prfx types pfuns consts (id, (s, e)) (ids as (tab, ctxt), thy) =
(case lookup consts s of
SOME ty =>
let
val (t, ty') = term_of_expr thy prfx types pfuns ids e;
val T = mk_type thy prfx ty;
val T' = mk_type thy prfx ty';
val _ = T = T' orelse
error ("Declared type " ^ ty ^ " of " ^ s ^
"\ndoes not match type " ^ ty' ^ " in definition");
val id' = mk_rulename id;
val lthy = Named_Target.theory_init thy;
val ((t', (_, th)), lthy') = Specification.definition
(NONE, ((id', []), HOLogic.mk_Trueprop (HOLogic.mk_eq
(Free (s, T), t)))) lthy;
val phi = Proof_Context.export_morphism lthy' lthy
in
((id', Morphism.thm phi th),
((Symtab.update (s, (Morphism.term phi t', ty)) tab,
Name.declare s ctxt),
Local_Theory.exit_global lthy'))
end
| NONE => error ("Undeclared constant " ^ s));
fun add_var prfx (s, ty) (ids, thy) =
let val ([Free p], ids') = mk_variables thy prfx [s] ty ids
in (p, (ids', thy)) end;
fun add_init_vars prfx vcs (ids_thy as ((tab, _), _)) =
fold_map (add_var prfx)
(map_filter
(fn s => case try (unsuffix "~") s of
SOME s' => (case Symtab.lookup tab s' of
SOME (_, ty) => SOME (s, ty)
| NONE => error ("Undeclared identifier " ^ s'))
| NONE => NONE)
(fold_vcs (add_expr_idents o snd) vcs []))
ids_thy;
fun is_trivial_vc ([], [(_, Ident "true")]) = true
| is_trivial_vc _ = false;
fun rulenames rules = commas
(map (fn ((s, i), _) => s ^ "(" ^ string_of_int i ^ ")") rules);
(* sort definitions according to their dependency *)
fun sort_defs _ _ _ _ [] sdefs = rev sdefs
| sort_defs prfx funs pfuns consts defs sdefs =
(case find_first (fn (_, (_, e)) =>
forall (is_some o lookup_prfx prfx pfuns)
(add_expr_pfuns funs e []) andalso
forall (fn id =>
member (fn (s, (_, (s', _))) => s = s') sdefs id orelse
consts id)
(add_expr_idents e [])) defs of
SOME d => sort_defs prfx funs pfuns consts
(remove (op =) d defs) (d :: sdefs)
| NONE => error ("Bad definitions: " ^ rulenames defs));
fun set_vcs ({types, vars, consts, funs} : decls)
(rules, _) ((_, ident), vcs) path prfx thy =
let
val {pfuns, ...} = VCs.get thy;
val (defs, rules') = partition_opt dest_def rules;
val consts' =
subtract (fn ((_, (s, _)), (s', _)) => s = s') defs (items consts);
(* ignore all complex rules in rls files *)
val (rules'', other_rules) =
List.partition (complex_rule o snd) rules';
val _ = if null rules'' then ()
else warning ("Ignoring rules: " ^ rulenames rules'');
val vcs' = VCtab.make (maps (fn (tr, vcs) =>
map (fn (s, (ps, cs)) => (s, (tr, NONE, ps, cs)))
(filter_out (is_trivial_vc o snd) vcs)) vcs);
val _ = (case filter_out (is_some o lookup funs)
(pfuns_of_vcs prfx funs pfuns vcs') of
[] => ()
| fs => error ("Undeclared proof function(s) " ^ commas fs));
val (((defs', vars''), ivars), (ids, thy')) =
((Symtab.empty |>
Symtab.update ("false", (HOLogic.false_const, booleanN)) |>
Symtab.update ("true", (HOLogic.true_const, booleanN)),
Name.context),
thy |> Sign.add_path (Long_Name.base_name ident)) |>
fold (add_type_def prfx) (items types) |>
fold (snd oo add_const prfx) consts' |> (fn ids_thy as ((tab, _), _) =>
ids_thy |>
fold_map (add_def prfx types pfuns consts)
(sort_defs prfx funs pfuns (Symtab.defined tab) defs []) ||>>
fold_map (add_var prfx) (items vars) ||>>
add_init_vars prfx vcs');
val ctxt =
[Element.Fixes (map (fn (s, T) =>
(Binding.name s, SOME T, NoSyn)) (vars'' @ ivars)),
Element.Assumes (map (fn (id, rl) =>
((mk_rulename id, []),
[(term_of_rule thy' prfx types pfuns ids rl, [])]))
other_rules),
Element.Notes ("", [((Binding.name "defns", []), map (rpair [] o single o snd) defs')])]
in
set_env {ctxt = ctxt, defs = defs', types = types, funs = funs,
ids = ids, proving = false, vcs = vcs', path = path, prefix = prfx} thy'
end;
end;