src/Tools/Code/code_eval.ML

+(*  Title:      Tools/code/code_eval.ML_
+    Author:     Florian Haftmann, TU Muenchen
+
+Runtime services building on code generation into implementation language SML.
+*)
+
+signature CODE_EVAL =
+sig
+  val target: string
+  val eval: string option -> string * (unit -> 'a) option Unsynchronized.ref
+    -> ((term -> term) -> 'a -> 'a) -> theory -> term -> string list -> 'a
+  val evaluation_code: theory -> string list -> string list
+    -> string * ((string * string) list * (string * string) list)
+  val setup: theory -> theory
+end;
+
+structure Code_Eval : CODE_EVAL =
+struct
+
+(** generic **)
+
+val target = "Eval";
+
+val eval_struct_name = "Code"
+
+fun evaluation_code thy tycos consts =
+  let
+    val (consts', (naming, program)) = Code_Thingol.consts_program thy consts;
+    val tycos' = map (the o Code_Thingol.lookup_tyco naming) tycos;
+    val (ml_code, target_names) = Code_ML.evaluation_code_of thy target
+      (SOME eval_struct_name) naming program (consts' @ tycos');
+    val (consts'', tycos'') = chop (length consts') target_names;
+    val consts_map = map2 (fn const => fn NONE =>
+        error ("Constant " ^ (quote o Code.string_of_const thy) const
+          ^ "\nhas a user-defined serialization")
+      | SOME const'' => (const, const'')) consts consts''
+    val tycos_map = map2 (fn tyco => fn NONE =>
+        error ("Type " ^ (quote o Sign.extern_type thy) tyco
+          ^ "\nhas a user-defined serialization")
+      | SOME tyco'' => (tyco, tyco'')) tycos tycos'';
+  in (ml_code, (tycos_map, consts_map)) end;
+
+
+(** evaluation **)
+
+fun eval some_target reff postproc thy t args =
+  let
+    val ctxt = ProofContext.init thy;
+    fun evaluator naming program ((_, (_, ty)), t) deps =
+      let
+        val _ = if Code_Thingol.contains_dictvar t then
+          error "Term to be evaluated contains free dictionaries" else ();
+        val value_name = "Value.VALUE.value"
+        val program' = program
+          |> Graph.new_node (value_name,
+              Code_Thingol.Fun (Term.dummy_patternN, (([], ty), [(([], t), (Drule.dummy_thm, true))])))
+          |> fold (curry Graph.add_edge value_name) deps;
+        val (value_code, [SOME value_name']) = Code_ML.evaluation_code_of thy
+          (the_default target some_target) NONE naming program' [value_name];
+        val sml_code = "let\n" ^ value_code ^ "\nin " ^ value_name'
+          ^ space_implode " " (map (enclose "(" ")") args) ^ " end";
+      in ML_Context.evaluate ctxt false reff sml_code end;
+  in Code_Thingol.eval thy postproc evaluator t end;
+
+
+(** instrumentalization by antiquotation **)
+
+local
+
+structure CodeAntiqData = Proof_Data
+(
+  type T = (string list * string list) * (bool * (string
+    * (string * ((string * string) list * (string * string) list)) lazy));
+  fun init _ = (([], []), (true, ("", Lazy.value ("", ([], [])))));
+);
+
+val is_first_occ = fst o snd o CodeAntiqData.get;
+
+fun register_code new_tycos new_consts ctxt =
+  let
+    val ((tycos, consts), (_, (struct_name, _))) = CodeAntiqData.get ctxt;
+    val tycos' = fold (insert (op =)) new_tycos tycos;
+    val consts' = fold (insert (op =)) new_consts consts;
+    val (struct_name', ctxt') = if struct_name = ""
+      then ML_Antiquote.variant eval_struct_name ctxt
+      else (struct_name, ctxt);
+    val acc_code = Lazy.lazy (fn () => evaluation_code (ProofContext.theory_of ctxt) tycos' consts');
+  in CodeAntiqData.put ((tycos', consts'), (false, (struct_name', acc_code))) ctxt' end;
+
+fun register_const const = register_code [] [const];
+
+fun register_datatype tyco constrs = register_code [tyco] constrs;
+
+fun print_const const all_struct_name tycos_map consts_map =
+  (Long_Name.append all_struct_name o the o AList.lookup (op =) consts_map) const;
+
+fun print_datatype tyco constrs all_struct_name tycos_map consts_map =
+  let
+    val upperize = implode o nth_map 0 Symbol.to_ascii_upper o explode;
+    fun check_base name name'' =
+      if upperize (Long_Name.base_name name) = upperize name''
+      then () else error ("Name as printed " ^ quote name''
+        ^ "\ndiffers from logical base name " ^ quote (Long_Name.base_name name) ^ "; sorry.");
+    val tyco'' = (the o AList.lookup (op =) tycos_map) tyco;
+    val constrs'' = map (the o AList.lookup (op =) consts_map) constrs;
+    val _ = check_base tyco tyco'';
+    val _ = map2 check_base constrs constrs'';
+  in "datatype " ^ tyco'' ^ " = datatype " ^ Long_Name.append all_struct_name tyco'' end;
+
+fun print_code struct_name is_first print_it ctxt =
+  let
+    val (_, (_, (struct_code_name, acc_code))) = CodeAntiqData.get ctxt;
+    val (ml_code, (tycos_map, consts_map)) = Lazy.force acc_code;
+    val ml_code = if is_first then ml_code
+      else "";
+    val all_struct_name = Long_Name.append struct_name struct_code_name;
+  in (ml_code, print_it all_struct_name tycos_map consts_map) end;
+
+in
+
+fun ml_code_antiq raw_const {struct_name, background} =
+  let
+    val const = Code.check_const (ProofContext.theory_of background) raw_const;
+    val is_first = is_first_occ background;
+    val background' = register_const const background;
+  in (print_code struct_name is_first (print_const const), background') end;
+
+fun ml_code_datatype_antiq (raw_tyco, raw_constrs) {struct_name, background} =
+  let
+    val thy = ProofContext.theory_of background;
+    val tyco = Sign.intern_type thy raw_tyco;
+    val constrs = map (Code.check_const thy) raw_constrs;
+    val constrs' = (map fst o snd o Code.get_datatype thy) tyco;
+    val _ = if eq_set (op =) (constrs, constrs') then ()
+      else error ("Type " ^ quote tyco ^ ": given constructors diverge from real constructors")
+    val is_first = is_first_occ background;
+    val background' = register_datatype tyco constrs background;
+  in (print_code struct_name is_first (print_datatype tyco constrs), background') end;
+
+end; (*local*)
+
+
+(** Isar setup **)
+
+val _ = ML_Context.add_antiq "code" (fn _ => Args.term >> ml_code_antiq);
+val _ = ML_Context.add_antiq "code_datatype" (fn _ =>
+  (Args.tyname --| Scan.lift (Args.$$$ "=")
+    -- (Args.term ::: Scan.repeat (Scan.lift (Args.$$$ "|") |-- Args.term)))
+      >> ml_code_datatype_antiq);
+
+val setup = Code_Target.extend_target (target, (Code_ML.target_SML, K I));
+
+end; (*struct*)