diff --git a/src/Pure/Isar/code.ML b/src/Pure/Isar/code.ML --- a/src/Pure/Isar/code.ML +++ b/src/Pure/Isar/code.ML @@ -1,1578 +1,1580 @@ (* Title: Pure/Isar/code.ML Author: Florian Haftmann, TU Muenchen Abstract executable ingredients of theory. Management of data dependent on executable ingredients as synchronized cache; purged on any change of underlying executable ingredients. *) signature CODE = sig (*constants*) val check_const: theory -> term -> string val read_const: theory -> string -> string val string_of_const: theory -> string -> string val args_number: theory -> string -> int (*constructor sets*) val constrset_of_consts: theory -> (string * typ) list -> string * ((string * sort) list * (string * ((string * sort) list * typ list)) list) (*code equations and certificates*) val assert_eqn: theory -> thm * bool -> thm * bool val assert_abs_eqn: theory -> string option -> thm -> thm * (string * string) type cert val constrain_cert: theory -> sort list -> cert -> cert val conclude_cert: cert -> cert val typargs_deps_of_cert: theory -> cert -> (string * sort) list * (string * typ list) list val equations_of_cert: theory -> cert -> ((string * sort) list * typ) * (((string option * term) list * (string option * term)) * (thm option * bool)) list option val pretty_cert: theory -> cert -> Pretty.T list (*executable code*) type constructors type abs_type val type_interpretation: (string -> theory -> theory) -> theory -> theory val datatype_interpretation: (string * constructors -> theory -> theory) -> theory -> theory val abstype_interpretation: (string * abs_type -> theory -> theory) -> theory -> theory val declare_datatype_global: (string * typ) list -> theory -> theory val declare_datatype_cmd: string list -> theory -> theory val declare_abstype: thm -> local_theory -> local_theory val declare_abstype_global: thm -> theory -> theory val declare_default_eqns: (thm * bool) list -> local_theory -> local_theory val declare_default_eqns_global: (thm * bool) list -> theory -> theory val declare_eqns: (thm * bool) list -> local_theory -> local_theory val declare_eqns_global: (thm * bool) list -> theory -> theory val add_eqn_global: thm * bool -> theory -> theory val del_eqn_global: thm -> theory -> theory val declare_abstract_eqn: thm -> local_theory -> local_theory val declare_abstract_eqn_global: thm -> theory -> theory val declare_aborting_global: string -> theory -> theory val declare_unimplemented_global: string -> theory -> theory val declare_case_global: thm -> theory -> theory val declare_undefined_global: string -> theory -> theory val get_type: theory -> string -> constructors * bool val get_type_of_constr_or_abstr: theory -> string -> (string * bool) option val is_constr: theory -> string -> bool val is_abstr: theory -> string -> bool val get_cert: Proof.context -> ((thm * bool) list -> (thm * bool) list option) list -> string -> cert type case_schema val get_case_schema: theory -> string -> case_schema option val get_case_cong: theory -> string -> thm option val is_undefined: theory -> string -> bool val print_codesetup: theory -> unit end; signature CODE_DATA_ARGS = sig type T val empty: T end; signature CODE_DATA = sig type T val change: theory option -> (T -> T) -> T val change_yield: theory option -> (T -> 'a * T) -> 'a * T end; signature PRIVATE_CODE = sig include CODE val declare_data: Any.T -> serial val change_yield_data: serial * ('a -> Any.T) * (Any.T -> 'a) -> theory -> ('a -> 'b * 'a) -> 'b * 'a end; structure Code : PRIVATE_CODE = struct (** auxiliary **) (* printing *) fun string_of_typ thy = Syntax.string_of_typ (Config.put show_sorts true (Syntax.init_pretty_global thy)); fun string_of_const thy c = let val ctxt = Proof_Context.init_global thy in case Axclass.inst_of_param thy c of SOME (c, tyco) => Proof_Context.extern_const ctxt c ^ " " ^ enclose "[" "]" (Proof_Context.extern_type ctxt tyco) | NONE => Proof_Context.extern_const ctxt c end; (* constants *) fun const_typ thy = Type.strip_sorts o Sign.the_const_type thy; fun args_number thy = length o binder_types o const_typ thy; fun devarify ty = let val tys = build (fold_atyps (fn TVar vi_sort => AList.update (op =) vi_sort) ty); val vs = Name.invent Name.context Name.aT (length tys); val mapping = map2 (fn v => fn (vi, sort) => (vi, TFree (v, sort))) vs tys; in Term.typ_subst_TVars mapping ty end; fun typscheme thy (c, ty) = (map dest_TFree (Sign.const_typargs thy (c, ty)), Type.strip_sorts ty); fun typscheme_equiv (ty1, ty2) = Type.raw_instance (devarify ty1, ty2) andalso Type.raw_instance (devarify ty2, ty1); fun check_bare_const thy t = case try dest_Const t of SOME c_ty => c_ty | NONE => error ("Not a constant: " ^ Syntax.string_of_term_global thy t); fun check_unoverload thy (c, ty) = let val c' = Axclass.unoverload_const thy (c, ty); val ty_decl = const_typ thy c'; in if typscheme_equiv (ty_decl, Logic.varifyT_global ty) then c' else error ("Type\n" ^ string_of_typ thy ty ^ "\nof constant " ^ quote c ^ "\nis too specific compared to declared type\n" ^ string_of_typ thy ty_decl) end; fun check_const thy = check_unoverload thy o check_bare_const thy; fun read_bare_const thy = check_bare_const thy o Syntax.read_term_global thy; fun read_const thy = check_unoverload thy o read_bare_const thy; (** executable specifications **) (* types *) datatype type_spec = Constructors of { constructors: (string * ((string * sort) list * typ list)) list, case_combinators: string list} | Abstractor of { abs_rep: thm, abstractor: string * ((string * sort) list * typ), projection: string, more_abstract_functions: string list}; fun concrete_constructors_of (Constructors {constructors, ...}) = constructors | concrete_constructors_of _ = []; fun constructors_of (Constructors {constructors, ...}) = (constructors, false) | constructors_of (Abstractor {abstractor = (co, (vs, ty)), ...}) = ([(co, (vs, [ty]))], true); fun case_combinators_of (Constructors {case_combinators, ...}) = case_combinators | case_combinators_of (Abstractor _) = []; fun add_case_combinator c (vs, Constructors {constructors, case_combinators}) = (vs, Constructors {constructors = constructors, case_combinators = insert (op =) c case_combinators}); fun projection_of (Constructors _) = NONE | projection_of (Abstractor {projection, ...}) = SOME projection; fun abstract_functions_of (Constructors _) = [] | abstract_functions_of (Abstractor {more_abstract_functions, projection, ...}) = projection :: more_abstract_functions; fun add_abstract_function c (vs, Abstractor {abs_rep, abstractor, projection, more_abstract_functions}) = (vs, Abstractor {abs_rep = abs_rep, abstractor = abstractor, projection = projection, more_abstract_functions = insert (op =) c more_abstract_functions}); fun join_same_types' (Constructors {constructors, case_combinators = case_combinators1}, Constructors {case_combinators = case_combinators2, ...}) = Constructors {constructors = constructors, case_combinators = merge (op =) (case_combinators1, case_combinators2)} | join_same_types' (Abstractor {abs_rep, abstractor, projection, more_abstract_functions = more_abstract_functions1}, Abstractor {more_abstract_functions = more_abstract_functions2, ...}) = Abstractor {abs_rep = abs_rep, abstractor = abstractor, projection = projection, more_abstract_functions = merge (op =) (more_abstract_functions1, more_abstract_functions2)}; fun join_same_types ((vs, spec1), (_, spec2)) = (vs, join_same_types' (spec1, spec2)); (* functions *) datatype fun_spec = Eqns of bool * (thm * bool) list | Proj of term * (string * string) | Abstr of thm * (string * string); val unimplemented = Eqns (true, []); fun is_unimplemented (Eqns (true, [])) = true | is_unimplemented _ = false; fun is_default (Eqns (true, _)) = true | is_default _ = false; val aborting = Eqns (false, []); fun associated_abstype (Proj (_, tyco_abs)) = SOME tyco_abs | associated_abstype (Abstr (_, tyco_abs)) = SOME tyco_abs | associated_abstype _ = NONE; (* cases *) type case_schema = int * (int * (string * int) option list); datatype case_spec = No_Case | Case of {schema: case_schema, tycos: string list, cong: thm} | Undefined; fun associated_datatypes (Case {tycos, schema = (_, (_, raw_cos)), ...}) = (tycos, map fst (map_filter I raw_cos)) | associated_datatypes _ = ([], []); (** background theory data store **) (* historized declaration data *) structure History = struct type 'a T = { entry: 'a, suppressed: bool, (*incompatible entries are merely suppressed after theory merge but sustain*) history: serial list (*explicit trace of declaration history supports non-monotonic declarations*) } Symtab.table; fun some_entry (SOME {suppressed = false, entry, ...}) = SOME entry | some_entry _ = NONE; fun lookup table = Symtab.lookup table #> some_entry; fun register key entry table = if is_some (Symtab.lookup table key) then Symtab.map_entry key (fn {history, ...} => {entry = entry, suppressed = false, history = serial () :: history}) table else Symtab.update (key, {entry = entry, suppressed = false, history = [serial ()]}) table; fun modify_entry key f = Symtab.map_entry key (fn {entry, suppressed, history} => {entry = f entry, suppressed = suppressed, history = history}); fun all table = Symtab.dest table |> map_filter (fn (key, {entry, suppressed = false, ...}) => SOME (key, entry) | _ => NONE); local fun merge_history join_same ({entry = entry1, history = history1, ...}, {entry = entry2, history = history2, ...}) = let val history = merge (op =) (history1, history2); val entry = if hd history1 = hd history2 then join_same (entry1, entry2) else if hd history = hd history1 then entry1 else entry2; in {entry = entry, suppressed = false, history = history} end; in fun join join_same tables = Symtab.join (K (merge_history join_same)) tables; fun suppress key = Symtab.map_entry key (fn {entry, history, ...} => {entry = entry, suppressed = true, history = history}); fun suppress_except f = Symtab.map (fn key => fn {entry, suppressed, history} => {entry = entry, suppressed = suppressed orelse (not o f) (key, entry), history = history}); end; end; datatype specs = Specs of { types: ((string * sort) list * type_spec) History.T, pending_eqns: (thm * bool) list Symtab.table, functions: fun_spec History.T, cases: case_spec History.T }; fun types_of (Specs {types, ...}) = types; fun pending_eqns_of (Specs {pending_eqns, ...}) = pending_eqns; fun functions_of (Specs {functions, ...}) = functions; fun cases_of (Specs {cases, ...}) = cases; fun make_specs (types, ((pending_eqns, functions), cases)) = Specs {types = types, pending_eqns = pending_eqns, functions = functions, cases = cases}; val empty_specs = make_specs (Symtab.empty, ((Symtab.empty, Symtab.empty), Symtab.empty)); fun map_specs f (Specs {types = types, pending_eqns = pending_eqns, functions = functions, cases = cases}) = make_specs (f (types, ((pending_eqns, functions), cases))); fun merge_specs (Specs {types = types1, pending_eqns = _, functions = functions1, cases = cases1}, Specs {types = types2, pending_eqns = _, functions = functions2, cases = cases2}) = let val types = History.join join_same_types (types1, types2); val all_types = map (snd o snd) (History.all types); fun check_abstype (c, fun_spec) = case associated_abstype fun_spec of NONE => true | SOME (tyco, abs) => (case History.lookup types tyco of NONE => false | SOME (_, Constructors _) => false | SOME (_, Abstractor {abstractor = (abs', _), projection, more_abstract_functions, ...}) => abs = abs' andalso (c = projection orelse member (op =) more_abstract_functions c)); fun check_datatypes (_, case_spec) = let val (tycos, required_constructors) = associated_datatypes case_spec; val allowed_constructors = tycos |> maps (these o Option.map (concrete_constructors_of o snd) o History.lookup types) |> map fst; in subset (op =) (required_constructors, allowed_constructors) end; val all_constructors = maps (fst o constructors_of) all_types; val functions = History.join fst (functions1, functions2) |> fold (History.suppress o fst) all_constructors |> History.suppress_except check_abstype; val cases = History.join fst (cases1, cases2) |> History.suppress_except check_datatypes; in make_specs (types, ((Symtab.empty, functions), cases)) end; val map_types = map_specs o apfst; val map_pending_eqns = map_specs o apsnd o apfst o apfst; val map_functions = map_specs o apsnd o apfst o apsnd; val map_cases = map_specs o apsnd o apsnd; (* data slots dependent on executable code *) (*private copy avoids potential conflict of table exceptions*) structure Datatab = Table(type key = int val ord = int_ord); local type kind = {empty: Any.T}; val kinds = Synchronized.var "Code_Data" (Datatab.empty: kind Datatab.table); fun invoke f k = (case Datatab.lookup (Synchronized.value kinds) k of SOME kind => f kind | NONE => raise Fail "Invalid code data identifier"); in fun declare_data empty = let val k = serial (); val kind = {empty = empty}; val _ = Synchronized.change kinds (Datatab.update (k, kind)); in k end; fun invoke_init k = invoke (fn kind => #empty kind) k; end; (*local*) (* global theory store *) local type data = Any.T Datatab.table; fun make_dataref () = Synchronized.var "code data" (NONE : (data * Context.theory_id) option); structure Code_Data = Theory_Data ( type T = specs * (string * (data * Context.theory_id) option Synchronized.var); val empty = (empty_specs, (Context.theory_long_name (Context.the_global_context ()), make_dataref ())); fun merge ((specs1, dataref), (specs2, _)) = (merge_specs (specs1, specs2), dataref); ); fun init_dataref thy = let val thy_name = Context.theory_long_name thy in if #1 (#2 (Code_Data.get thy)) = thy_name then NONE else SOME ((Code_Data.map o apsnd) (K (thy_name, make_dataref ())) thy) end; in val _ = Theory.setup (Theory.at_begin init_dataref); (* access to executable specifications *) val specs_of : theory -> specs = fst o Code_Data.get; fun modify_specs f thy = let val thy_name = Context.theory_long_name thy in Code_Data.map (fn (specs, _) => (f specs, (thy_name, make_dataref ()))) thy end; (* access to data dependent on executable specifications *) fun change_yield_data (kind, mk, dest) theory f = let val dataref = #2 (#2 (Code_Data.get theory)); val (datatab, thy_id) = case Synchronized.value dataref of SOME (datatab, thy_id) => if Context.eq_thy_id (Context.theory_id theory, thy_id) then (datatab, thy_id) else (Datatab.empty, Context.theory_id theory) | NONE => (Datatab.empty, Context.theory_id theory) val data = case Datatab.lookup datatab kind of SOME data => data | NONE => invoke_init kind; val result as (_, data') = f (dest data); val _ = Synchronized.change dataref ((K o SOME) (Datatab.update (kind, mk data') datatab, thy_id)); in result end; end; (*local*) (* pending function equations *) (* Ideally, *all* equations implementing a functions would be treated as *one* atomic declaration; unfortunately, we cannot implement this: the too-well-established declaration interface are Isar attributes which operate on *one* single theorem. Hence we treat such Isar declarations as "pending" and historize them as proper declarations at the end of each theory. *) fun modify_pending_eqns c f specs = let val existing_eqns = case History.lookup (functions_of specs) c of SOME (Eqns (false, eqns)) => eqns | _ => []; in specs |> map_pending_eqns (Symtab.map_default (c, existing_eqns) f) end; fun register_fun_spec c spec = map_pending_eqns (Symtab.delete_safe c) #> map_functions (History.register c spec); fun lookup_fun_spec specs c = case Symtab.lookup (pending_eqns_of specs) c of SOME eqns => Eqns (false, eqns) | NONE => (case History.lookup (functions_of specs) c of SOME spec => spec | NONE => unimplemented); fun lookup_proper_fun_spec specs c = let val spec = lookup_fun_spec specs c in if is_unimplemented spec then NONE else SOME spec end; fun all_fun_specs specs = map_filter (fn c => Option.map (pair c) (lookup_proper_fun_spec specs c)) (union (op =) ((Symtab.keys o pending_eqns_of) specs) ((Symtab.keys o functions_of) specs)); fun historize_pending_fun_specs thy = let val pending_eqns = (pending_eqns_of o specs_of) thy; in if Symtab.is_empty pending_eqns then NONE else thy |> modify_specs (map_functions (Symtab.fold (fn (c, eqs) => History.register c (Eqns (false, eqs))) pending_eqns) #> map_pending_eqns (K Symtab.empty)) |> SOME end; val _ = Theory.setup (Theory.at_end historize_pending_fun_specs); (** foundation **) (* types *) fun no_constr thy s (c, ty) = error ("Not a datatype constructor:\n" ^ string_of_const thy c ^ " :: " ^ string_of_typ thy ty ^ "\n" ^ enclose "(" ")" s); fun analyze_constructor thy (c, ty) = let val _ = Thm.global_cterm_of thy (Const (c, ty)); val ty_decl = devarify (const_typ thy c); fun last_typ c_ty ty = let val tfrees = Term.add_tfreesT ty []; val (tyco, vs) = (apsnd o map) dest_TFree (dest_Type (body_type ty)) handle TYPE _ => no_constr thy "bad type" c_ty val _ = if tyco = "fun" then no_constr thy "bad type" c_ty else (); val _ = if has_duplicates (eq_fst (op =)) vs then no_constr thy "duplicate type variables in datatype" c_ty else (); val _ = if length tfrees <> length vs then no_constr thy "type variables missing in datatype" c_ty else (); in (tyco, vs) end; val (tyco, _) = last_typ (c, ty) ty_decl; val (_, vs) = last_typ (c, ty) ty; in ((tyco, map snd vs), (c, (map fst vs, ty))) end; fun constrset_of_consts thy consts = let val _ = map (fn (c, _) => if (is_some o Axclass.class_of_param thy) c then error ("Is a class parameter: " ^ string_of_const thy c) else ()) consts; val raw_constructors = map (analyze_constructor thy) consts; val tyco = case distinct (op =) (map (fst o fst) raw_constructors) of [tyco] => tyco | [] => error "Empty constructor set" | tycos => error ("Different type constructors in constructor set: " ^ commas_quote tycos) val vs = Name.invent Name.context Name.aT (Sign.arity_number thy tyco); fun inst vs' (c, (vs, ty)) = let val the_v = the o AList.lookup (op =) (vs ~~ vs'); val ty' = map_type_tfree (fn (v, _) => TFree (the_v v, [])) ty; val (vs'', ty'') = typscheme thy (c, ty'); in (c, (vs'', binder_types ty'')) end; val constructors = map (inst vs o snd) raw_constructors; in (tyco, (map (rpair []) vs, constructors)) end; fun lookup_vs_type_spec thy = History.lookup ((types_of o specs_of) thy); type constructors = (string * sort) list * (string * ((string * sort) list * typ list)) list; fun get_type thy tyco = case lookup_vs_type_spec thy tyco of SOME (vs, type_spec) => apfst (pair vs) (constructors_of type_spec) | NONE => Sign.arity_number thy tyco |> Name.invent Name.context Name.aT |> map (rpair []) |> rpair [] |> rpair false; type abs_type = (string * sort) list * {abs_rep: thm, abstractor: string * ((string * sort) list * typ), projection: string}; fun get_abstype_spec thy tyco = case lookup_vs_type_spec thy tyco of SOME (vs, Abstractor {abs_rep, abstractor, projection, ...}) => - (vs, {abs_rep = abs_rep, abstractor = abstractor, projection = projection}) + (vs, {abs_rep = Thm.transfer thy abs_rep, abstractor = abstractor, projection = projection}) | _ => error ("Not an abstract type: " ^ tyco); fun get_type_of_constr_or_abstr thy c = case (body_type o const_typ thy) c of Type (tyco, _) => let val ((_, cos), abstract) = get_type thy tyco in if member (op =) (map fst cos) c then SOME (tyco, abstract) else NONE end | _ => NONE; fun is_constr thy c = case get_type_of_constr_or_abstr thy c of SOME (_, false) => true | _ => false; fun is_abstr thy c = case get_type_of_constr_or_abstr thy c of SOME (_, true) => true | _ => false; (* bare code equations *) (* convention for variables: ?x ?'a for free-floating theorems (e.g. in the data store) ?x 'a for certificates x 'a for final representation of equations *) exception BAD_THM of string; fun bad_thm msg = raise BAD_THM msg; datatype strictness = Silent | Liberal | Strict fun handle_strictness thm_of f strictness thy x = SOME (f x) handle BAD_THM msg => case strictness of Silent => NONE | Liberal => (warning (msg ^ ", in theorem:\n" ^ Thm.string_of_thm_global thy (thm_of x)); NONE) | Strict => error (msg ^ ", in theorem:\n" ^ Thm.string_of_thm_global thy (thm_of x)); fun is_linear thm = let val (_, args) = (strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of) thm in not (has_duplicates (op =) ((fold o fold_aterms) (fn Var (v, _) => cons v | _ => I) args [])) end; fun check_decl_ty thy (c, ty) = let val ty_decl = const_typ thy c; in if typscheme_equiv (ty_decl, ty) then () else bad_thm ("Type\n" ^ string_of_typ thy ty ^ "\nof constant " ^ quote c ^ "\nis too specific compared to declared type\n" ^ string_of_typ thy ty_decl) end; fun check_eqn thy {allow_nonlinear, allow_consts, allow_pats} thm (lhs, rhs) = let fun vars_of t = fold_aterms (fn Var (v, _) => insert (op =) v | Free _ => bad_thm "Illegal free variable" | _ => I) t []; fun tvars_of t = fold_term_types (fn _ => fold_atyps (fn TVar (v, _) => insert (op =) v | TFree _ => bad_thm "Illegal free type variable")) t []; val lhs_vs = vars_of lhs; val rhs_vs = vars_of rhs; val lhs_tvs = tvars_of lhs; val rhs_tvs = tvars_of rhs; val _ = if null (subtract (op =) lhs_vs rhs_vs) then () else bad_thm "Free variables on right hand side of equation"; val _ = if null (subtract (op =) lhs_tvs rhs_tvs) then () else bad_thm "Free type variables on right hand side of equation"; val (head, args) = strip_comb lhs; val (c, ty) = case head of Const (c_ty as (_, ty)) => (Axclass.unoverload_const thy c_ty, ty) | _ => bad_thm "Equation not headed by constant"; fun check _ (Abs _) = bad_thm "Abstraction on left hand side of equation" | check 0 (Var _) = () | check _ (Var _) = bad_thm "Variable with application on left hand side of equation" | check n (t1 $ t2) = (check (n+1) t1; check 0 t2) | check n (Const (c_ty as (c, ty))) = if allow_pats then let val c' = Axclass.unoverload_const thy c_ty in if n = (length o binder_types) ty then if allow_consts orelse is_constr thy c' then () else bad_thm (quote c ^ " is not a constructor, on left hand side of equation") else bad_thm ("Partially applied constant " ^ quote c ^ " on left hand side of equation") end else bad_thm ("Pattern not allowed here, but constant " ^ quote c ^ " encountered on left hand side of equation") val _ = map (check 0) args; val _ = if allow_nonlinear orelse is_linear thm then () else bad_thm "Duplicate variables on left hand side of equation"; val _ = if (is_none o Axclass.class_of_param thy) c then () else bad_thm "Overloaded constant as head in equation"; val _ = if not (is_constr thy c) then () else bad_thm "Constructor as head in equation"; val _ = if not (is_abstr thy c) then () else bad_thm "Abstractor as head in equation"; val _ = check_decl_ty thy (c, ty); val _ = case strip_type ty of (Type (tyco, _) :: _, _) => (case lookup_vs_type_spec thy tyco of SOME (_, type_spec) => (case projection_of type_spec of SOME proj => if c = proj then bad_thm "Projection as head in equation" else () | _ => ()) | _ => ()) | _ => (); in () end; local fun raw_assert_eqn thy check_patterns (thm, proper) = let val (lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm handle TERM _ => bad_thm "Not an equation" | THM _ => bad_thm "Not a proper equation"; val _ = check_eqn thy {allow_nonlinear = not proper, allow_consts = not (proper andalso check_patterns), allow_pats = true} thm (lhs, rhs); in (thm, proper) end; fun raw_assert_abs_eqn thy some_tyco thm = let val (full_lhs, rhs) = (Logic.dest_equals o Thm.plain_prop_of) thm handle TERM _ => bad_thm "Not an equation" | THM _ => bad_thm "Not a proper equation"; val (proj_t, lhs) = dest_comb full_lhs handle TERM _ => bad_thm "Not an abstract equation"; val (proj, ty) = dest_Const proj_t handle TERM _ => bad_thm "Not an abstract equation"; val (tyco, Ts) = (dest_Type o domain_type) ty handle TERM _ => bad_thm "Not an abstract equation" | TYPE _ => bad_thm "Not an abstract equation"; val _ = case some_tyco of SOME tyco' => if tyco = tyco' then () else bad_thm ("Abstract type mismatch:" ^ quote tyco ^ " vs. " ^ quote tyco') | NONE => (); val (vs, proj', (abs', _)) = case lookup_vs_type_spec thy tyco of SOME (vs, Abstractor spec) => (vs, #projection spec, #abstractor spec) | _ => bad_thm ("Not an abstract type: " ^ tyco); val _ = if proj = proj' then () else bad_thm ("Projection mismatch: " ^ quote proj ^ " vs. " ^ quote proj'); val _ = check_eqn thy {allow_nonlinear = false, allow_consts = false, allow_pats = false} thm (lhs, rhs); val _ = if ListPair.all (fn (T, (_, sort)) => Sign.of_sort thy (T, sort)) (Ts, vs) then () else error ("Type arguments do not satisfy sort constraints of abstype certificate."); in (thm, (tyco, abs')) end; in fun generic_assert_eqn strictness thy check_patterns eqn = handle_strictness fst (raw_assert_eqn thy check_patterns) strictness thy eqn; fun generic_assert_abs_eqn strictness thy check_patterns thm = handle_strictness I (raw_assert_abs_eqn thy check_patterns) strictness thy thm; end; fun assert_eqn thy = the o generic_assert_eqn Strict thy true; fun assert_abs_eqn thy some_tyco = the o generic_assert_abs_eqn Strict thy some_tyco; val head_eqn = dest_Const o fst o strip_comb o fst o Logic.dest_equals o Thm.plain_prop_of; fun const_typ_eqn thy thm = let val (c, ty) = head_eqn thm; val c' = Axclass.unoverload_const thy (c, ty); (*permissive wrt. to overloaded constants!*) in (c', ty) end; fun const_eqn thy = fst o const_typ_eqn thy; fun const_abs_eqn thy = Axclass.unoverload_const thy o dest_Const o fst o strip_comb o snd o dest_comb o fst o Logic.dest_equals o Thm.plain_prop_of; fun mk_proj tyco vs ty abs rep = let val ty_abs = Type (tyco, map TFree vs); val xarg = Var (("x", 0), ty); in Logic.mk_equals (Const (rep, ty_abs --> ty) $ (Const (abs, ty --> ty_abs) $ xarg), xarg) end; (* technical transformations of code equations *) fun meta_rewrite thy = Local_Defs.meta_rewrite_rule (Proof_Context.init_global thy); fun same_arity thy thms = let val lhs_rhss = map (Logic.dest_equals o Thm.plain_prop_of) thms; val k = fold (Integer.max o length o snd o strip_comb o fst) lhs_rhss 0; fun expand_eta (lhs, rhs) thm = let val l = k - length (snd (strip_comb lhs)); val (raw_vars, _) = Term.strip_abs_eta l rhs; val vars = burrow_fst (Name.variant_list (map (fst o fst) (Term.add_vars lhs []))) raw_vars; fun expand (v, ty) thm = Drule.fun_cong_rule thm (Thm.global_cterm_of thy (Var ((v, 0), ty))); in thm |> fold expand vars |> Conv.fconv_rule Drule.beta_eta_conversion end; in map2 expand_eta lhs_rhss thms end; fun mk_desymbolization pre post mk vs = let val names = map (pre o fst o fst) vs |> map (Name.desymbolize (SOME false)) |> Name.variant_list [] |> map post; in map_filter (fn (((v, i), x), v') => if v = v' andalso i = 0 then NONE else SOME (((v, i), x), mk ((v', 0), x))) (vs ~~ names) end; fun desymbolize_tvars thy thms = let val tvs = build (fold (Term.add_tvars o Thm.prop_of) thms); val instT = mk_desymbolization (unprefix "'") (prefix "'") (Thm.global_ctyp_of thy o TVar) tvs; in map (Thm.instantiate (TVars.make instT, Vars.empty)) thms end; fun desymbolize_vars thy thm = let val vs = Term.add_vars (Thm.prop_of thm) []; val inst = mk_desymbolization I I (Thm.global_cterm_of thy o Var) vs; in Thm.instantiate (TVars.empty, Vars.make inst) thm end; fun canonize_thms thy = desymbolize_tvars thy #> same_arity thy #> map (desymbolize_vars thy); (* preparation and classification of code equations *) fun prep_eqn strictness thy = apfst (meta_rewrite thy) #> generic_assert_eqn strictness thy false #> Option.map (fn eqn => (const_eqn thy (fst eqn), eqn)); fun prep_eqns strictness thy = map_filter (prep_eqn strictness thy) #> AList.group (op =); fun prep_abs_eqn strictness thy = meta_rewrite thy #> generic_assert_abs_eqn strictness thy NONE #> Option.map (fn abs_eqn => (const_abs_eqn thy (fst abs_eqn), abs_eqn)); fun prep_maybe_abs_eqn thy raw_thm = let val thm = meta_rewrite thy raw_thm; val some_abs_thm = generic_assert_abs_eqn Silent thy NONE thm; in case some_abs_thm of SOME (thm, tyco) => SOME (const_abs_eqn thy thm, ((thm, true), SOME tyco)) | NONE => generic_assert_eqn Liberal thy false (thm, false) |> Option.map (fn (thm, _) => (const_eqn thy thm, ((thm, is_linear thm), NONE))) end; (* abstype certificates *) local fun raw_abstype_cert thy proto_thm = let val thm = (Axclass.unoverload (Proof_Context.init_global thy) o meta_rewrite thy) proto_thm; val (lhs, rhs) = Logic.dest_equals (Thm.plain_prop_of thm) handle TERM _ => bad_thm "Not an equation" | THM _ => bad_thm "Not a proper equation"; val ((abs, raw_ty), ((rep, rep_ty), param)) = (apsnd (apfst dest_Const o dest_comb) o apfst dest_Const o dest_comb) lhs handle TERM _ => bad_thm "Not an abstype certificate"; val _ = apply2 (fn c => if (is_some o Axclass.class_of_param thy) c then error ("Is a class parameter: " ^ string_of_const thy c) else ()) (abs, rep); val _ = check_decl_ty thy (abs, raw_ty); val _ = check_decl_ty thy (rep, rep_ty); val _ = if length (binder_types raw_ty) = 1 then () else bad_thm "Bad type for abstract constructor"; val _ = (fst o dest_Var) param handle TERM _ => bad_thm "Not an abstype certificate"; val _ = if param = rhs then () else bad_thm "Not an abstype certificate"; val ((tyco, sorts), (abs, (vs, ty'))) = analyze_constructor thy (abs, devarify raw_ty); val ty = domain_type ty'; val (vs', _) = typscheme thy (abs, ty'); in (tyco, (vs ~~ sorts, ((abs, (vs', ty)), (rep, thm)))) end; in fun check_abstype_cert strictness thy proto_thm = handle_strictness I (raw_abstype_cert thy) strictness thy proto_thm; end; (* code equation certificates *) fun build_head thy (c, ty) = Thm.global_cterm_of thy (Logic.mk_equals (Free ("HEAD", ty), Const (c, ty))); fun get_head thy cert_thm = let val [head] = Thm.chyps_of cert_thm; val (_, Const (c, ty)) = (Logic.dest_equals o Thm.term_of) head; in (typscheme thy (c, ty), head) end; fun typscheme_projection thy = typscheme thy o dest_Const o fst o dest_comb o fst o Logic.dest_equals; fun typscheme_abs thy = typscheme thy o dest_Const o fst o strip_comb o snd o dest_comb o fst o Logic.dest_equals o Thm.prop_of; fun constrain_thm thy vs sorts thm = let val mapping = map2 (fn (v, sort) => fn sort' => (v, Sorts.inter_sort (Sign.classes_of thy) (sort, sort'))) vs sorts; val instT = TVars.build (fold2 (fn (v, sort) => fn (_, sort') => TVars.add (((v, 0), sort), Thm.global_ctyp_of thy (TFree (v, sort')))) vs mapping); val subst = (Term.map_types o map_type_tfree) (fn (v, _) => TFree (v, the (AList.lookup (op =) mapping v))); in thm |> Thm.varifyT_global |> Thm.instantiate (instT, Vars.empty) |> pair subst end; fun concretify_abs thy tyco abs_thm = let val (_, {abstractor = (c_abs, _), abs_rep, ...}) = get_abstype_spec thy tyco; val lhs = (fst o Logic.dest_equals o Thm.prop_of) abs_thm val ty = fastype_of lhs; val ty_abs = (fastype_of o snd o dest_comb) lhs; val abs = Thm.global_cterm_of thy (Const (c_abs, ty --> ty_abs)); val raw_concrete_thm = Drule.transitive_thm OF [Thm.symmetric abs_rep, Thm.combination (Thm.reflexive abs) abs_thm]; in (c_abs, (Thm.varifyT_global o zero_var_indexes) raw_concrete_thm) end; fun add_rhss_of_eqn thy t = let val (args, rhs) = (apfst (snd o strip_comb) o Logic.dest_equals) t; fun add_const (Const (c, ty)) = insert (op =) (c, Sign.const_typargs thy (c, ty)) | add_const _ = I val add_consts = fold_aterms add_const in add_consts rhs o fold add_consts args end; val dest_eqn = apfst (snd o strip_comb) o Logic.dest_equals o Logic.unvarify_global; abstype cert = Nothing of thm | Equations of thm * bool list | Projection of term * string | Abstract of thm * string with fun dummy_thm ctxt c = let val thy = Proof_Context.theory_of ctxt; val raw_ty = devarify (const_typ thy c); val (vs, _) = typscheme thy (c, raw_ty); val sortargs = case Axclass.class_of_param thy c of SOME class => [[class]] | NONE => (case get_type_of_constr_or_abstr thy c of SOME (tyco, _) => (map snd o fst o the) (AList.lookup (op =) ((snd o fst o get_type thy) tyco) c) | NONE => replicate (length vs) []); val the_sort = the o AList.lookup (op =) (map fst vs ~~ sortargs); val ty = map_type_tfree (fn (v, _) => TFree (v, the_sort v)) raw_ty val chead = build_head thy (c, ty); in Thm.weaken chead Drule.dummy_thm end; fun nothing_cert ctxt c = Nothing (dummy_thm ctxt c); fun cert_of_eqns ctxt c [] = Equations (dummy_thm ctxt c, []) | cert_of_eqns ctxt c raw_eqns = let val thy = Proof_Context.theory_of ctxt; val eqns = burrow_fst (canonize_thms thy) raw_eqns; val _ = map (assert_eqn thy) eqns; val (thms, propers) = split_list eqns; val _ = map (fn thm => if c = const_eqn thy thm then () else error ("Wrong head of code equation,\nexpected constant " ^ string_of_const thy c ^ "\n" ^ Thm.string_of_thm_global thy thm)) thms; val tvars_of = build_rev o Term.add_tvarsT; val vss = map (tvars_of o snd o head_eqn) thms; val inter_sorts = build o fold (curry (Sorts.inter_sort (Sign.classes_of thy)) o snd); val sorts = map_transpose inter_sorts vss; val vts = Name.invent_names Name.context Name.aT sorts; fun instantiate vs = Thm.instantiate (TVars.make (vs ~~ map (Thm.ctyp_of ctxt o TFree) vts), Vars.empty); val thms' = map2 instantiate vss thms; val head_thm = Thm.symmetric (Thm.assume (build_head thy (head_eqn (hd thms')))); fun head_conv ct = if can Thm.dest_comb ct then Conv.fun_conv head_conv ct else Conv.rewr_conv head_thm ct; val rewrite_head = Conv.fconv_rule (Conv.arg1_conv head_conv); val cert_thm = Conjunction.intr_balanced (map rewrite_head thms'); in Equations (cert_thm, propers) end; fun cert_of_proj ctxt proj tyco = let val thy = Proof_Context.theory_of ctxt val (vs, {abstractor = (abs, (_, ty)), projection = proj', ...}) = get_abstype_spec thy tyco; val _ = if proj = proj' then () else error ("Wrong head of projection,\nexpected constant " ^ string_of_const thy proj); in Projection (mk_proj tyco vs ty abs proj, tyco) end; fun cert_of_abs ctxt tyco c raw_abs_thm = let val thy = Proof_Context.theory_of ctxt; val abs_thm = singleton (canonize_thms thy) raw_abs_thm; val _ = assert_abs_eqn thy (SOME tyco) abs_thm; val _ = if c = const_abs_eqn thy abs_thm then () else error ("Wrong head of abstract code equation,\nexpected constant " ^ string_of_const thy c ^ "\n" ^ Thm.string_of_thm_global thy abs_thm); in Abstract (Thm.legacy_freezeT abs_thm, tyco) end; fun constrain_cert_thm thy sorts cert_thm = let val ((vs, _), head) = get_head thy cert_thm; val (subst, cert_thm') = cert_thm |> Thm.implies_intr head |> constrain_thm thy vs sorts; val head' = Thm.term_of head |> subst |> Thm.global_cterm_of thy; val cert_thm'' = cert_thm' |> Thm.elim_implies (Thm.assume head'); in cert_thm'' end; fun constrain_cert thy sorts (Nothing cert_thm) = Nothing (constrain_cert_thm thy sorts cert_thm) | constrain_cert thy sorts (Equations (cert_thm, propers)) = Equations (constrain_cert_thm thy sorts cert_thm, propers) | constrain_cert _ _ (cert as Projection _) = cert | constrain_cert thy sorts (Abstract (abs_thm, tyco)) = Abstract (snd (constrain_thm thy (fst (typscheme_abs thy abs_thm)) sorts abs_thm), tyco); fun conclude_cert (Nothing cert_thm) = - Nothing (Thm.close_derivation \<^here> cert_thm) + Nothing (Thm.close_derivation \<^here> cert_thm |> Thm.trim_context) | conclude_cert (Equations (cert_thm, propers)) = - Equations (Thm.close_derivation \<^here> cert_thm, propers) + Equations (Thm.close_derivation \<^here> cert_thm |> Thm.trim_context, propers) | conclude_cert (cert as Projection _) = cert | conclude_cert (Abstract (abs_thm, tyco)) = - Abstract (Thm.close_derivation \<^here> abs_thm, tyco); + Abstract (Thm.close_derivation \<^here> abs_thm |> Thm.trim_context, tyco); fun typscheme_of_cert thy (Nothing cert_thm) = fst (get_head thy cert_thm) | typscheme_of_cert thy (Equations (cert_thm, _)) = fst (get_head thy cert_thm) | typscheme_of_cert thy (Projection (proj, _)) = typscheme_projection thy proj | typscheme_of_cert thy (Abstract (abs_thm, _)) = typscheme_abs thy abs_thm; fun typargs_deps_of_cert thy (Nothing cert_thm) = let val vs = (fst o fst) (get_head thy cert_thm); in (vs, []) end | typargs_deps_of_cert thy (Equations (cert_thm, propers)) = let val vs = (fst o fst) (get_head thy cert_thm); val equations = if null propers then [] else Thm.prop_of cert_thm |> Logic.dest_conjunction_balanced (length propers); in (vs, build (fold (add_rhss_of_eqn thy) equations)) end | typargs_deps_of_cert thy (Projection (t, _)) = (fst (typscheme_projection thy t), add_rhss_of_eqn thy t []) | typargs_deps_of_cert thy (Abstract (abs_thm, tyco)) = let val vs = fst (typscheme_abs thy abs_thm); val (_, concrete_thm) = concretify_abs thy tyco abs_thm; in (vs, add_rhss_of_eqn thy (Logic.unvarify_types_global (Thm.prop_of concrete_thm)) []) end; fun equations_of_cert thy (cert as Nothing _) = (typscheme_of_cert thy cert, NONE) | equations_of_cert thy (cert as Equations (cert_thm, propers)) = let val tyscm = typscheme_of_cert thy cert; val thms = if null propers then [] else cert_thm + |> Thm.transfer thy |> Local_Defs.expand [snd (get_head thy cert_thm)] |> Thm.varifyT_global |> Conjunction.elim_balanced (length propers); fun abstractions (args, rhs) = (map (pair NONE) args, (NONE, rhs)); in (tyscm, SOME (map (abstractions o dest_eqn o Thm.prop_of) thms ~~ (map SOME thms ~~ propers))) end | equations_of_cert thy (Projection (t, tyco)) = let val (_, {abstractor = (abs, _), ...}) = get_abstype_spec thy tyco; val tyscm = typscheme_projection thy t; val t' = Logic.varify_types_global t; fun abstractions (args, rhs) = (map (pair (SOME abs)) args, (NONE, rhs)); in (tyscm, SOME [((abstractions o dest_eqn) t', (NONE, true))]) end | equations_of_cert thy (Abstract (abs_thm, tyco)) = let val tyscm = typscheme_abs thy abs_thm; - val (abs, concrete_thm) = concretify_abs thy tyco abs_thm; + val (abs, concrete_thm) = concretify_abs thy tyco (Thm.transfer thy abs_thm); fun abstractions (args, rhs) = (map (pair NONE) args, (SOME abs, rhs)); in (tyscm, SOME [((abstractions o dest_eqn o Thm.prop_of) concrete_thm, (SOME (Thm.varifyT_global abs_thm), true))]) end; fun pretty_cert _ (Nothing _) = [] | pretty_cert thy (cert as Equations _) = (map_filter (Option.map (Thm.pretty_thm_global thy o Axclass.overload (Proof_Context.init_global thy)) o fst o snd) o these o snd o equations_of_cert thy) cert | pretty_cert thy (Projection (t, _)) = [Syntax.pretty_term_global thy (Logic.varify_types_global t)] | pretty_cert thy (Abstract (abs_thm, _)) = [(Thm.pretty_thm_global thy o Axclass.overload (Proof_Context.init_global thy) o Thm.varifyT_global) abs_thm]; end; (* code certificate access with preprocessing *) fun eqn_conv conv ct = let fun lhs_conv ct = if can Thm.dest_comb ct then Conv.combination_conv lhs_conv conv ct else Conv.all_conv ct; in Conv.combination_conv (Conv.arg_conv lhs_conv) conv ct end; fun rewrite_eqn conv ctxt = singleton (Variable.trade (K (map (Conv.fconv_rule (conv (Simplifier.rewrite ctxt))))) ctxt) fun apply_functrans ctxt functrans = let fun trace_eqns s eqns = (Pretty.writeln o Pretty.chunks) (Pretty.str s :: map (Thm.pretty_thm ctxt o fst) eqns); val tracing = if Config.get ctxt simp_trace then trace_eqns else (K o K) (); in tap (tracing "before function transformation") #> (perhaps o perhaps_loop o perhaps_apply) functrans #> tap (tracing "after function transformation") end; fun preprocess conv ctxt = rewrite_eqn conv ctxt #> Axclass.unoverload ctxt; fun get_cert ctxt functrans c = case lookup_proper_fun_spec (specs_of (Proof_Context.theory_of ctxt)) c of NONE => nothing_cert ctxt c | SOME (Eqns (_, eqns)) => eqns |> (map o apfst) (Thm.transfer' ctxt) |> apply_functrans ctxt functrans |> (map o apfst) (preprocess eqn_conv ctxt) |> cert_of_eqns ctxt c | SOME (Proj (_, (tyco, _))) => cert_of_proj ctxt c tyco | SOME (Abstr (abs_thm, (tyco, _))) => abs_thm |> Thm.transfer' ctxt |> preprocess Conv.arg_conv ctxt |> cert_of_abs ctxt tyco c; (* case certificates *) local fun raw_case_cert thm = let val ((head, raw_case_expr), cases) = (apfst Logic.dest_equals o apsnd Logic.dest_conjunctions o Logic.dest_implies o Thm.plain_prop_of) thm; val _ = case head of Free _ => () | Var _ => () | _ => raise TERM ("case_cert", []); val ([(case_var, _)], case_expr) = Term.strip_abs_eta 1 raw_case_expr; val (Const (case_const, _), raw_params) = strip_comb case_expr; val n = find_index (fn Free (v, _) => v = case_var | _ => false) raw_params; val _ = if n = ~1 then raise TERM ("case_cert", []) else (); val params = map (fst o dest_Var) (nth_drop n raw_params); fun dest_case t = let val (head' $ t_co, rhs) = Logic.dest_equals t; val _ = if head' = head then () else raise TERM ("case_cert", []); val (Const (co, _), args) = strip_comb t_co; val (Var (param, _), args') = strip_comb rhs; val _ = if args' = args then () else raise TERM ("case_cert", []); in (param, co) end; fun analyze_cases cases = let val co_list = build (fold (AList.update (op =) o dest_case) cases); in map (AList.lookup (op =) co_list) params end; fun analyze_let t = let val (head' $ arg, Var (param', _) $ arg') = Logic.dest_equals t; val _ = if head' = head then () else raise TERM ("case_cert", []); val _ = if arg' = arg then () else raise TERM ("case_cert", []); val _ = if [param'] = params then () else raise TERM ("case_cert", []); in [] end; fun analyze (cases as [let_case]) = (analyze_cases cases handle Bind => analyze_let let_case) | analyze cases = analyze_cases cases; in (case_const, (n, analyze cases)) end; in fun case_cert thm = raw_case_cert thm handle Bind => error "bad case certificate" | TERM _ => error "bad case certificate"; end; fun lookup_case_spec thy = History.lookup ((cases_of o specs_of) thy); fun get_case_schema thy c = case lookup_case_spec thy c of SOME (Case {schema, ...}) => SOME schema | _ => NONE; fun get_case_cong thy c = case lookup_case_spec thy c of SOME (Case {cong, ...}) => SOME cong | _ => NONE; fun is_undefined thy c = case lookup_case_spec thy c of SOME Undefined => true | _ => false; (* diagnostic *) fun print_codesetup thy = let val ctxt = Proof_Context.init_global thy; val specs = specs_of thy; fun pretty_equations const thms = (Pretty.block o Pretty.fbreaks) (Pretty.str (string_of_const thy const) :: map (Thm.pretty_thm_item ctxt) thms); fun pretty_function (const, Eqns (_, eqns)) = pretty_equations const (map fst eqns) | pretty_function (const, Proj (proj, _)) = Pretty.block [Pretty.str (string_of_const thy const), Pretty.fbrk, Syntax.pretty_term ctxt proj] | pretty_function (const, Abstr (thm, _)) = pretty_equations const [thm]; fun pretty_typ (tyco, vs) = Pretty.str (string_of_typ thy (Type (tyco, map TFree vs))); fun pretty_type_spec (typ, (cos, abstract)) = if null cos then pretty_typ typ else (Pretty.block o Pretty.breaks) ( pretty_typ typ :: Pretty.str "=" :: (if abstract then [Pretty.str "(abstract)"] else []) @ separate (Pretty.str "|") (map (fn (c, (_, [])) => Pretty.str (string_of_const thy c) | (c, (_, tys)) => (Pretty.block o Pretty.breaks) (Pretty.str (string_of_const thy c) :: Pretty.str "of" :: map (Pretty.quote o Syntax.pretty_typ_global thy) tys)) cos) ); fun pretty_case_param NONE = "" | pretty_case_param (SOME (c, _)) = string_of_const thy c fun pretty_case (const, Case {schema = (_, (_, [])), ...}) = Pretty.str (string_of_const thy const) | pretty_case (const, Case {schema = (_, (_, cos)), ...}) = (Pretty.block o Pretty.breaks) [ Pretty.str (string_of_const thy const), Pretty.str "with", (Pretty.block o Pretty.commas o map (Pretty.str o pretty_case_param)) cos] | pretty_case (const, Undefined) = (Pretty.block o Pretty.breaks) [ Pretty.str (string_of_const thy const), Pretty.str ""]; val functions = all_fun_specs specs |> sort (string_ord o apply2 fst); val types = History.all (types_of specs) |> map (fn (tyco, (vs, spec)) => ((tyco, vs), constructors_of spec)) |> sort (string_ord o apply2 (fst o fst)); val cases = History.all (cases_of specs) |> filter (fn (_, No_Case) => false | _ => true) |> sort (string_ord o apply2 fst); in Pretty.writeln_chunks [ Pretty.block ( Pretty.str "types:" :: Pretty.fbrk :: (Pretty.fbreaks o map pretty_type_spec) types ), Pretty.block ( Pretty.str "functions:" :: Pretty.fbrk :: (Pretty.fbreaks o map pretty_function) functions ), Pretty.block ( Pretty.str "cases:" :: Pretty.fbrk :: (Pretty.fbreaks o map pretty_case) cases ) ] end; (** declaration of executable ingredients **) (* plugins for dependent applications *) structure Codetype_Plugin = Plugin(type T = string); val codetype_plugin = Plugin_Name.declare_setup \<^binding>\codetype\; fun type_interpretation f = Codetype_Plugin.interpretation codetype_plugin (fn tyco => Local_Theory.background_theory (fn thy => thy |> Sign.root_path |> Sign.add_path (Long_Name.qualifier tyco) |> f tyco |> Sign.restore_naming thy)); fun datatype_interpretation f = type_interpretation (fn tyco => fn thy => case get_type thy tyco of (spec, false) => f (tyco, spec) thy | (_, true) => thy ); fun abstype_interpretation f = type_interpretation (fn tyco => fn thy => case try (get_abstype_spec thy) tyco of SOME spec => f (tyco, spec) thy | NONE => thy ); fun register_tyco_for_plugin tyco = Named_Target.theory_map (Codetype_Plugin.data_default tyco); (* abstract code declarations *) local fun generic_code_declaration strictness lift_phi f x = Local_Theory.declaration {syntax = false, pervasive = false} (fn phi => Context.mapping (f strictness (lift_phi phi x)) I); in fun silent_code_declaration lift_phi = generic_code_declaration Silent lift_phi; fun code_declaration lift_phi = generic_code_declaration Liberal lift_phi; end; (* types *) fun invalidate_constructors_of (_, type_spec) = fold (fn (c, _) => History.register c unimplemented) (fst (constructors_of type_spec)); fun invalidate_abstract_functions_of (_, type_spec) = fold (fn c => History.register c unimplemented) (abstract_functions_of type_spec); fun invalidate_case_combinators_of (_, type_spec) = fold (fn c => History.register c No_Case) (case_combinators_of type_spec); fun register_type (tyco, vs_typ_spec) specs = let val olds = the_list (History.lookup (types_of specs) tyco); in specs |> map_functions (fold invalidate_abstract_functions_of olds #> invalidate_constructors_of vs_typ_spec) |> map_cases (fold invalidate_case_combinators_of olds) |> map_types (History.register tyco vs_typ_spec) end; fun declare_datatype_global proto_constrs thy = let fun unoverload_const_typ (c, ty) = (Axclass.unoverload_const thy (c, ty), ty); val constrs = map unoverload_const_typ proto_constrs; val (tyco, (vs, cos)) = constrset_of_consts thy constrs; in thy |> modify_specs (register_type (tyco, (vs, Constructors {constructors = cos, case_combinators = []}))) |> register_tyco_for_plugin tyco end; fun declare_datatype_cmd raw_constrs thy = declare_datatype_global (map (read_bare_const thy) raw_constrs) thy; fun generic_declare_abstype strictness proto_thm thy = case check_abstype_cert strictness thy proto_thm of SOME (tyco, (vs, (abstractor as (abs, (_, ty)), (proj, abs_rep)))) => thy |> modify_specs (register_type - (tyco, (vs, Abstractor {abstractor = abstractor, projection = proj, abs_rep = abs_rep, more_abstract_functions = []})) + (tyco, (vs, Abstractor {abstractor = abstractor, projection = proj, + abs_rep = Thm.trim_context abs_rep, more_abstract_functions = []})) #> register_fun_spec proj (Proj (Logic.varify_types_global (mk_proj tyco vs ty abs proj), (tyco, abs)))) |> register_tyco_for_plugin tyco | NONE => thy; val declare_abstype_global = generic_declare_abstype Strict; val declare_abstype = code_declaration Morphism.thm generic_declare_abstype; (* functions *) (* strictness wrt. shape of theorem propositions: * default equations: silent * using declarations and attributes: warnings (after morphism application!) * using global declarations (... -> thy -> thy): strict * internal processing after storage: strict *) local fun subsumptive_add thy verbose (thm, proper) eqns = let val args_of = drop_prefix is_Var o rev o snd o strip_comb o Term.map_types Type.strip_sorts o fst o Logic.dest_equals o Thm.plain_prop_of o Thm.transfer thy; val args = args_of thm; val incr_idx = Logic.incr_indexes ([], [], Thm.maxidx_of thm + 1); fun matches_args args' = let val k = length args' - length args in if k >= 0 then Pattern.matchess thy (args, (map incr_idx o drop k) args') else false end; fun drop (thm', proper') = if (proper orelse not proper') andalso matches_args (args_of thm') then (if verbose then warning ("Code generator: dropping subsumed code equation\n" ^ Thm.string_of_thm_global thy thm') else (); true) else false; in (thm |> Thm.close_derivation \<^here> |> Thm.trim_context, proper) :: filter_out drop eqns end; fun add_eqn_for (c, eqn) thy = thy |> modify_specs (modify_pending_eqns c (subsumptive_add thy true eqn)); fun add_eqns_for default (c, proto_eqns) thy = thy |> modify_specs (fn specs => if is_default (lookup_fun_spec specs c) orelse not default then let val eqns = [] |> fold_rev (subsumptive_add thy (not default)) proto_eqns; in specs |> register_fun_spec c (Eqns (default, eqns)) end else specs); fun add_abstract_for (c, (thm, tyco_abs as (tyco, _))) = - modify_specs (register_fun_spec c (Abstr (Thm.close_derivation \<^here> thm, tyco_abs)) + modify_specs (register_fun_spec c (Abstr (Thm.close_derivation \<^here> thm |> Thm.trim_context, tyco_abs)) #> map_types (History.modify_entry tyco (add_abstract_function c))) in fun generic_declare_eqns default strictness raw_eqns thy = fold (add_eqns_for default) (prep_eqns strictness thy raw_eqns) thy; fun generic_add_eqn strictness raw_eqn thy = fold add_eqn_for (the_list (prep_eqn strictness thy raw_eqn)) thy; fun generic_declare_abstract_eqn strictness raw_abs_eqn thy = fold add_abstract_for (the_list (prep_abs_eqn strictness thy raw_abs_eqn)) thy; fun add_maybe_abs_eqn_liberal thm thy = case prep_maybe_abs_eqn thy thm of SOME (c, (eqn, NONE)) => add_eqn_for (c, eqn) thy | SOME (c, ((thm, _), SOME tyco)) => add_abstract_for (c, (thm, tyco)) thy | NONE => thy; end; val declare_default_eqns_global = generic_declare_eqns true Silent; val declare_default_eqns = silent_code_declaration (map o apfst o Morphism.thm) (generic_declare_eqns true); val declare_eqns_global = generic_declare_eqns false Strict; val declare_eqns = code_declaration (map o apfst o Morphism.thm) (generic_declare_eqns false); val add_eqn_global = generic_add_eqn Strict; fun del_eqn_global thm thy = case prep_eqn Liberal thy (thm, false) of SOME (c, (thm, _)) => modify_specs (modify_pending_eqns c (filter_out (fn (thm', _) => Thm.eq_thm_prop (thm, thm')))) thy | NONE => thy; val declare_abstract_eqn_global = generic_declare_abstract_eqn Strict; val declare_abstract_eqn = code_declaration Morphism.thm generic_declare_abstract_eqn; fun declare_aborting_global c = modify_specs (register_fun_spec c aborting); fun declare_unimplemented_global c = modify_specs (register_fun_spec c unimplemented); (* cases *) fun case_cong thy case_const (num_args, (pos, _)) = let val ([x, y], ctxt) = fold_map Name.variant ["A", "A'"] Name.context; val (zs, _) = fold_map Name.variant (replicate (num_args - 1) "") ctxt; val (ws, vs) = chop pos zs; val T = devarify (const_typ thy case_const); val Ts = binder_types T; val T_cong = nth Ts pos; fun mk_prem z = Free (z, T_cong); fun mk_concl z = list_comb (Const (case_const, T), map2 (curry Free) (ws @ z :: vs) Ts); val (prem, concl) = apply2 Logic.mk_equals (apply2 mk_prem (x, y), apply2 mk_concl (x, y)); in Goal.prove_sorry_global thy (x :: y :: zs) [prem] concl (fn {context = ctxt', prems} => Simplifier.rewrite_goals_tac ctxt' prems THEN ALLGOALS (Proof_Context.fact_tac ctxt' [Drule.reflexive_thm])) end; fun declare_case_global thm thy = let val (case_const, (k, cos)) = case_cert thm; fun get_type_of_constr c = case get_type_of_constr_or_abstr thy c of SOME (c, false) => SOME c | _ => NONE; val cos_with_tycos = (map_filter o Option.map) (fn c => (c, get_type_of_constr c)) cos; val _ = case map_filter (fn (c, NONE) => SOME c | _ => NONE) cos_with_tycos of [] => () | cs => error ("Non-constructor(s) in case certificate: " ^ commas_quote cs); val tycos = distinct (op =) (map_filter snd cos_with_tycos); val schema = (1 + Int.max (1, length cos), (k, (map o Option.map) (fn c => (c, args_number thy c)) cos)); val cong = case_cong thy case_const schema; in thy |> modify_specs (map_cases (History.register case_const (Case {schema = schema, tycos = tycos, cong = cong})) #> map_types (fold (fn tyco => History.modify_entry tyco (add_case_combinator case_const)) tycos)) end; fun declare_undefined_global c = (modify_specs o map_cases) (History.register c Undefined); (* attributes *) fun code_attribute f = Thm.declaration_attribute (fn thm => Context.mapping (f thm) I); fun code_thm_attribute g f = Scan.lift (g |-- Scan.succeed (code_attribute f)); fun code_const_attribute g f = Scan.lift (g -- Args.colon) |-- Scan.repeat1 Args.term >> (fn ts => code_attribute (K (fold (fn t => fn thy => f ((check_const thy o Logic.unvarify_types_global) t) thy) ts))); val _ = Theory.setup (let val code_attribute_parser = code_thm_attribute (Args.$$$ "equation") (fn thm => generic_add_eqn Liberal (thm, true)) || code_thm_attribute (Args.$$$ "nbe") (fn thm => generic_add_eqn Liberal (thm, false)) || code_thm_attribute (Args.$$$ "abstract") (generic_declare_abstract_eqn Liberal) || code_thm_attribute (Args.$$$ "abstype") (generic_declare_abstype Liberal) || code_thm_attribute Args.del del_eqn_global || code_const_attribute (Args.$$$ "abort") declare_aborting_global || code_const_attribute (Args.$$$ "drop") declare_unimplemented_global || Scan.succeed (code_attribute add_maybe_abs_eqn_liberal); in Attrib.setup \<^binding>\code\ code_attribute_parser "declare theorems for code generation" end); end; (*struct*) (* type-safe interfaces for data dependent on executable code *) functor Code_Data(Data: CODE_DATA_ARGS): CODE_DATA = struct type T = Data.T; exception Data of T; fun dest (Data x) = x val kind = Code.declare_data (Data Data.empty); val data_op = (kind, Data, dest); fun change_yield (SOME thy) f = Code.change_yield_data data_op thy f | change_yield NONE f = f Data.empty fun change some_thy f = snd (change_yield some_thy (pair () o f)); end; structure Code : CODE = struct open Code; end;