author | haftmann |
Sat, 19 Dec 2015 17:03:17 +0100 | |
changeset 61891 | 76189756ff65 |
parent 58061 | 3d060f43accb |
child 69205 | 8050734eee3e |
permissions | -rw-r--r-- |
58061 | 1 |
(* Title: HOL/Tools/SMT/smtlib_proof.ML |
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Author: Sascha Boehme, TU Muenchen |
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Author: Mathias Fleury, ENS Rennes |
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Author: Jasmin Blanchette, TU Muenchen |
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SMT-LIB-2-style proofs: parsing and abstract syntax tree. |
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*) |
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signature SMTLIB_PROOF = |
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sig |
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datatype 'b shared = Tree of SMTLIB.tree | Term of term | Proof of 'b | None |
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type ('a, 'b) context |
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val mk_context: Proof.context -> int -> 'b shared Symtab.table -> typ Symtab.table -> |
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term Symtab.table -> 'a -> ('a, 'b) context |
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val empty_context: Proof.context -> typ Symtab.table -> term Symtab.table -> ('a list, 'b) context |
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val ctxt_of: ('a, 'b) context -> Proof.context |
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val lookup_binding: ('a, 'b) context -> string -> 'b shared |
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val update_binding: string * 'b shared -> ('a, 'b) context -> ('a, 'b) context |
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val with_bindings: (string * 'b shared) list -> (('a, 'b) context -> 'c * ('d, 'b) context) -> |
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('a, 'b) context -> 'c * ('d, 'b) context |
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val next_id: ('a, 'b) context -> int * ('a, 'b) context |
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val with_fresh_names: (('a list, 'b) context -> |
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term * ((string * (string * typ)) list, 'b) context) -> ('c, 'b) context -> (term * string list) |
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(*type and term parsers*) |
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type type_parser = SMTLIB.tree * typ list -> typ option |
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type term_parser = SMTLIB.tree * term list -> term option |
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val add_type_parser: type_parser -> Context.generic -> Context.generic |
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val add_term_parser: term_parser -> Context.generic -> Context.generic |
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exception SMTLIB_PARSE of string * SMTLIB.tree |
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val declare_fun: string -> typ -> ((string * typ) list, 'a) context -> |
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((string * typ) list, 'a) context |
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val dest_binding: SMTLIB.tree -> string * 'a shared |
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val type_of: ('a, 'b) context -> SMTLIB.tree -> typ |
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val term_of: SMTLIB.tree -> ((string * (string * typ)) list, 'a) context -> |
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term * ((string * (string * typ)) list, 'a) context |
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end; |
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structure SMTLIB_Proof: SMTLIB_PROOF = |
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struct |
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(* proof parser context *) |
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datatype 'b shared = Tree of SMTLIB.tree | Term of term | Proof of 'b | None |
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type ('a, 'b) context = { |
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ctxt: Proof.context, |
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id: int, |
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syms: 'b shared Symtab.table, |
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typs: typ Symtab.table, |
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funs: term Symtab.table, |
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extra: 'a} |
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fun mk_context ctxt id syms typs funs extra: ('a, 'b) context = |
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{ctxt = ctxt, id = id, syms = syms, typs = typs, funs = funs, extra = extra} |
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fun empty_context ctxt typs funs = mk_context ctxt 1 Symtab.empty typs funs [] |
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fun ctxt_of ({ctxt, ...}: ('a, 'b) context) = ctxt |
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fun lookup_binding ({syms, ...}: ('a, 'b) context) = |
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the_default None o Symtab.lookup syms |
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fun map_syms f ({ctxt, id, syms, typs, funs, extra}: ('a, 'b) context) = |
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mk_context ctxt id (f syms) typs funs extra |
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fun update_binding b = map_syms (Symtab.update b) |
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fun with_bindings bs f cx = |
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let val bs' = map (lookup_binding cx o fst) bs |
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in |
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cx |
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|> fold update_binding bs |
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|> f |
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||> fold2 (fn (name, _) => update_binding o pair name) bs bs' |
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end |
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fun next_id ({ctxt, id, syms, typs, funs, extra}: ('a, 'b) context) = |
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(id, mk_context ctxt (id + 1) syms typs funs extra) |
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fun with_fresh_names f ({ctxt, id, syms, typs, funs, ...}: ('a, 'b) context) = |
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let |
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fun bind (_, v as (_, T)) t = Logic.all_const T $ Term.absfree v t |
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val needs_inferT = equal Term.dummyT orf Term.is_TVar |
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val needs_infer = Term.exists_type (Term.exists_subtype needs_inferT) |
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fun infer_types ctxt = |
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singleton (Type_Infer_Context.infer_types ctxt) #> |
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singleton (Proof_Context.standard_term_check_finish ctxt) |
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fun infer ctxt t = if needs_infer t then infer_types ctxt t else t |
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val (t, {ctxt = ctxt', extra = names, ...}: ((string * (string * typ)) list, 'b) context) = |
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f (mk_context ctxt id syms typs funs []) |
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val t' = infer ctxt' (fold_rev bind names (HOLogic.mk_Trueprop t)) |
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in |
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(t', map fst names) |
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end |
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fun lookup_typ ({typs, ...}: ('a, 'b) context) = Symtab.lookup typs |
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fun lookup_fun ({funs, ...}: ('a, 'b) context) = Symtab.lookup funs |
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(* core type and term parser *) |
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fun core_type_parser (SMTLIB.Sym "Bool", []) = SOME @{typ HOL.bool} |
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| core_type_parser (SMTLIB.Sym "Int", []) = SOME @{typ Int.int} |
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| core_type_parser _ = NONE |
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fun mk_unary n t = |
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let val T = fastype_of t |
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in Const (n, T --> T) $ t end |
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fun mk_binary' n T U t1 t2 = Const (n, [T, T] ---> U) $ t1 $ t2 |
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fun mk_binary n t1 t2 = |
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let val T = fastype_of t1 |
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in mk_binary' n T T t1 t2 end |
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fun mk_rassoc f t ts = |
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let val us = rev (t :: ts) |
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in fold f (tl us) (hd us) end |
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fun mk_lassoc f t ts = fold (fn u1 => fn u2 => f u2 u1) ts t |
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fun mk_lassoc' n = mk_lassoc (mk_binary n) |
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fun mk_binary_pred n S t1 t2 = |
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let |
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val T1 = fastype_of t1 |
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val T2 = fastype_of t2 |
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val T = |
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if T1 <> Term.dummyT then T1 |
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else if T2 <> Term.dummyT then T2 |
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else TVar (("?a", serial ()), S) |
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in mk_binary' n T @{typ HOL.bool} t1 t2 end |
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fun mk_less t1 t2 = mk_binary_pred @{const_name ord_class.less} @{sort linorder} t1 t2 |
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fun mk_less_eq t1 t2 = mk_binary_pred @{const_name ord_class.less_eq} @{sort linorder} t1 t2 |
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|
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fun core_term_parser (SMTLIB.Sym "true", _) = SOME @{const HOL.True} |
144 |
| core_term_parser (SMTLIB.Sym "false", _) = SOME @{const HOL.False} |
|
145 |
| core_term_parser (SMTLIB.Sym "not", [t]) = SOME (HOLogic.mk_not t) |
|
146 |
| core_term_parser (SMTLIB.Sym "and", t :: ts) = SOME (mk_rassoc (curry HOLogic.mk_conj) t ts) |
|
147 |
| core_term_parser (SMTLIB.Sym "or", t :: ts) = SOME (mk_rassoc (curry HOLogic.mk_disj) t ts) |
|
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| core_term_parser (SMTLIB.Sym "=>", [t1, t2]) = SOME (HOLogic.mk_imp (t1, t2)) |
|
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| core_term_parser (SMTLIB.Sym "implies", [t1, t2]) = SOME (HOLogic.mk_imp (t1, t2)) |
|
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| core_term_parser (SMTLIB.Sym "=", [t1, t2]) = SOME (HOLogic.mk_eq (t1, t2)) |
|
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| core_term_parser (SMTLIB.Sym "~", [t1, t2]) = SOME (HOLogic.mk_eq (t1, t2)) |
|
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| core_term_parser (SMTLIB.Sym "ite", [t1, t2, t3]) = |
|
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let |
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val T = fastype_of t2 |
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val c = Const (@{const_name HOL.If}, [@{typ HOL.bool}, T, T] ---> T) |
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in SOME (c $ t1 $ t2 $ t3) end |
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| core_term_parser (SMTLIB.Num i, []) = SOME (HOLogic.mk_number @{typ Int.int} i) |
158 |
| core_term_parser (SMTLIB.Sym "-", [t]) = SOME (mk_unary @{const_name uminus_class.uminus} t) |
|
159 |
| core_term_parser (SMTLIB.Sym "~", [t]) = SOME (mk_unary @{const_name uminus_class.uminus} t) |
|
160 |
| core_term_parser (SMTLIB.Sym "+", t :: ts) = |
|
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SOME (mk_lassoc' @{const_name plus_class.plus} t ts) |
58061 | 162 |
| core_term_parser (SMTLIB.Sym "-", t :: ts) = |
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SOME (mk_lassoc' @{const_name minus_class.minus} t ts) |
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| core_term_parser (SMTLIB.Sym "*", t :: ts) = |
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SOME (mk_lassoc' @{const_name times_class.times} t ts) |
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| core_term_parser (SMTLIB.Sym "div", [t1, t2]) = SOME (mk_binary @{const_name z3div} t1 t2) |
167 |
| core_term_parser (SMTLIB.Sym "mod", [t1, t2]) = SOME (mk_binary @{const_name z3mod} t1 t2) |
|
168 |
| core_term_parser (SMTLIB.Sym "<", [t1, t2]) = SOME (mk_less t1 t2) |
|
169 |
| core_term_parser (SMTLIB.Sym ">", [t1, t2]) = SOME (mk_less t2 t1) |
|
170 |
| core_term_parser (SMTLIB.Sym "<=", [t1, t2]) = SOME (mk_less_eq t1 t2) |
|
171 |
| core_term_parser (SMTLIB.Sym ">=", [t1, t2]) = SOME (mk_less_eq t2 t1) |
|
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| core_term_parser _ = NONE |
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|
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(* custom type and term parsers *) |
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|
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type type_parser = SMTLIB.tree * typ list -> typ option |
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|
58061 | 179 |
type term_parser = SMTLIB.tree * term list -> term option |
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|
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fun id_ord ((id1, _), (id2, _)) = int_ord (id1, id2) |
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|
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structure Parsers = Generic_Data |
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( |
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type T = (int * type_parser) list * (int * term_parser) list |
56122 | 186 |
val empty : T = ([(serial (), core_type_parser)], [(serial (), core_term_parser)]) |
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val extend = I |
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fun merge ((tys1, ts1), (tys2, ts2)) = |
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(Ord_List.merge id_ord (tys1, tys2), Ord_List.merge id_ord (ts1, ts2)) |
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) |
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|
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fun add_type_parser type_parser = |
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Parsers.map (apfst (Ord_List.insert id_ord (serial (), type_parser))) |
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|
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fun add_term_parser term_parser = |
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Parsers.map (apsnd (Ord_List.insert id_ord (serial (), term_parser))) |
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|
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fun get_type_parsers ctxt = map snd (fst (Parsers.get (Context.Proof ctxt))) |
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fun get_term_parsers ctxt = map snd (snd (Parsers.get (Context.Proof ctxt))) |
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|
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fun apply_parsers parsers x = |
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let |
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fun apply [] = NONE |
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| apply (parser :: parsers) = |
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(case parser x of |
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SOME y => SOME y |
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| NONE => apply parsers) |
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in apply parsers end |
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|
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210 |
|
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(* type and term parsing *) |
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|
58061 | 213 |
exception SMTLIB_PARSE of string * SMTLIB.tree |
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|
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val desymbolize = Name.desymbolize (SOME false) o perhaps (try (unprefix "?")) |
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|
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fun fresh_fun add name n T ({ctxt, id, syms, typs, funs, extra}: ('a, 'b) context) = |
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let |
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val (n', ctxt') = yield_singleton Variable.variant_fixes n ctxt |
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val t = Free (n', T) |
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val funs' = Symtab.update (name, t) funs |
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in (t, mk_context ctxt' id syms typs funs' (add (n', T) extra)) end |
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|
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fun declare_fun name = snd oo fresh_fun cons name (desymbolize name) |
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fun declare_free name = fresh_fun (cons o pair name) name (desymbolize name) |
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|
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fun parse_type cx ty Ts = |
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(case apply_parsers (get_type_parsers (ctxt_of cx)) (ty, Ts) of |
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SOME T => T |
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| NONE => |
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(case ty of |
58061 | 232 |
SMTLIB.Sym name => |
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(case lookup_typ cx name of |
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SOME T => T |
58061 | 235 |
| NONE => raise SMTLIB_PARSE ("unknown SMT type", ty)) |
236 |
| _ => raise SMTLIB_PARSE ("bad SMT type format", ty))) |
|
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|
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fun parse_term t ts cx = |
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(case apply_parsers (get_term_parsers (ctxt_of cx)) (t, ts) of |
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SOME u => (u, cx) |
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| NONE => |
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(case t of |
58061 | 243 |
SMTLIB.Sym name => |
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(case lookup_fun cx name of |
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SOME u => (Term.list_comb (u, ts), cx) |
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| NONE => |
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if null ts then declare_free name Term.dummyT cx |
58061 | 248 |
else raise SMTLIB_PARSE ("bad SMT term", t)) |
249 |
| _ => raise SMTLIB_PARSE ("bad SMT term format", t))) |
|
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|
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fun type_of cx ty = |
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(case try (parse_type cx ty) [] of |
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SOME T => T |
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| NONE => |
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255 |
(case ty of |
58061 | 256 |
SMTLIB.S (ty' :: tys) => parse_type cx ty' (map (type_of cx) tys) |
257 |
| _ => raise SMTLIB_PARSE ("bad SMT type", ty))) |
|
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258 |
|
58061 | 259 |
fun dest_var cx (SMTLIB.S [SMTLIB.Sym name, ty]) = (name, (desymbolize name, type_of cx ty)) |
260 |
| dest_var _ v = raise SMTLIB_PARSE ("bad SMT quantifier variable format", v) |
|
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|
58061 | 262 |
fun dest_body (SMTLIB.S (SMTLIB.Sym "!" :: body :: _)) = dest_body body |
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| dest_body body = body |
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264 |
|
58061 | 265 |
fun dest_binding (SMTLIB.S [SMTLIB.Sym name, t]) = (name, Tree t) |
266 |
| dest_binding b = raise SMTLIB_PARSE ("bad SMT let binding format", b) |
|
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267 |
|
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fun term_of t cx = |
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(case t of |
58061 | 270 |
SMTLIB.S [SMTLIB.Sym "forall", SMTLIB.S vars, body] => quant HOLogic.mk_all vars body cx |
271 |
| SMTLIB.S [SMTLIB.Sym "exists", SMTLIB.S vars, body] => quant HOLogic.mk_exists vars body cx |
|
272 |
| SMTLIB.S [SMTLIB.Sym "let", SMTLIB.S bindings, body] => |
|
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273 |
with_bindings (map dest_binding bindings) (term_of body) cx |
58061 | 274 |
| SMTLIB.S (SMTLIB.Sym "!" :: t :: _) => term_of t cx |
275 |
| SMTLIB.S (f :: args) => |
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cx |
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|> fold_map term_of args |
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|-> parse_term f |
58061 | 279 |
| SMTLIB.Sym name => |
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(case lookup_binding cx name of |
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Tree u => |
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cx |
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|> term_of u |
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|-> (fn u' => pair u' o update_binding (name, Term u')) |
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| Term u => (u, cx) |
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| None => parse_term t [] cx |
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| _ => raise SMTLIB_PARSE ("bad SMT term format", t)) |
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| _ => parse_term t [] cx) |
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|
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and quant q vars body cx = |
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let val vs = map (dest_var cx) vars |
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in |
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cx |
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|> with_bindings (map (apsnd (Term o Free)) vs) (term_of (dest_body body)) |
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|>> fold_rev (fn (_, (n, T)) => fn t => q (n, T, t)) vs |
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end |
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|
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end; |