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-rw-r--r--compiler/ExtractTypes.ml133
1 files changed, 130 insertions, 3 deletions
diff --git a/compiler/ExtractTypes.ml b/compiler/ExtractTypes.ml
index 6a6067de..4272e7a9 100644
--- a/compiler/ExtractTypes.ml
+++ b/compiler/ExtractTypes.ml
@@ -1664,12 +1664,133 @@ let extract_type_decl_coq_arguments (ctx : extraction_ctx) (fmt : F.formatter)
(** Auxiliary function.
+ Generate field projectors in Lean.
+
+ Recursive structs are defined as inductives in Lean.
+ Field projectors allow to retrieve the facilities provided by
+ Lean structures.
+ *)
+let extract_type_decl_lean_record_field_projectors (ctx : extraction_ctx)
+ (fmt : F.formatter) (kind : decl_kind) (decl : type_decl) : unit =
+ sanity_check __FILE__ __LINE__ (!backend = Lean) decl.meta;
+ match decl.kind with
+ | Opaque | Enum _ -> ()
+ | Struct fields ->
+ (* Records are extracted as inductives only if they are recursive *)
+ let is_rec = decl_is_from_rec_group kind in
+ if is_rec then
+ (* Add the type params *)
+ let ctx, type_params, cg_params, trait_clauses =
+ ctx_add_generic_params decl.meta decl.llbc_name decl.llbc_generics
+ decl.generics ctx
+ in
+ (* Record_var will be the ADT argument to the projector *)
+ let ctx, record_var = ctx_add_var decl.meta "x" (VarId.of_int 0) ctx in
+ (* Field_var will be the variable in the constructor that is returned by the projector *)
+ let ctx, field_var = ctx_add_var decl.meta "x" (VarId.of_int 1) ctx in
+ (* Name of the ADT *)
+ let def_name = ctx_get_local_type decl.meta decl.def_id ctx in
+ (* Name of the ADT constructor. As we are in the struct case, we only have
+ one constructor *)
+ let cons_name = ctx_get_struct decl.meta (TAdtId decl.def_id) ctx in
+
+ let extract_field_proj (field_id : FieldId.id) (_ : field) : unit =
+ F.pp_print_space fmt ();
+ (* Box for the projector definition *)
+ F.pp_open_hvbox fmt 0;
+ (* Box for the [def ADT.proj ... :=] *)
+ F.pp_open_hovbox fmt ctx.indent_incr;
+ F.pp_print_string fmt "def";
+ F.pp_print_space fmt ();
+
+ (* Print the function name. In Lean, the syntax ADT.proj will
+ allow us to call x.proj for any x of type ADT *)
+ let field_name =
+ ctx_get_field decl.meta (TAdtId decl.def_id) field_id ctx
+ in
+ F.pp_print_string fmt def_name;
+ F.pp_print_string fmt ".";
+ F.pp_print_string fmt field_name;
+
+ (* Print the generics *)
+ let as_implicits = true in
+ extract_generic_params decl.meta ctx fmt TypeDeclId.Set.empty
+ ~as_implicits decl.generics type_params cg_params trait_clauses;
+
+ (* Print the record parameter as "(x : ADT)" *)
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt "(";
+ F.pp_print_string fmt record_var;
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt ":";
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt def_name;
+ List.iter
+ (fun p ->
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt p)
+ type_params;
+ F.pp_print_string fmt ")";
+
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt ":=";
+
+ (* Close the box for the [def ADT.proj ... :=] *)
+ F.pp_close_box fmt ();
+ F.pp_print_space fmt ();
+
+ (* Open a box for the whole match *)
+ F.pp_open_hvbox fmt 0;
+
+ (* Open a box for the [match ... with] *)
+ F.pp_open_hovbox fmt ctx.indent_incr;
+ F.pp_print_string fmt "match";
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt record_var;
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt "with";
+ (* Close the box for the [match ... with] *)
+ F.pp_close_box fmt ();
+
+ (* Open a box for the branch *)
+ F.pp_open_hovbox fmt ctx.indent_incr;
+ (* Print the match branch *)
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt "|";
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt cons_name;
+ FieldId.iteri
+ (fun id _ ->
+ F.pp_print_space fmt ();
+ if field_id = id then F.pp_print_string fmt field_var
+ else F.pp_print_string fmt "_")
+ fields;
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt "=>";
+ F.pp_print_space fmt ();
+ F.pp_print_string fmt field_var;
+ (* Close the box for the branch *)
+ F.pp_close_box fmt ();
+
+ (* Close the box for the whole match *)
+ F.pp_close_box fmt ();
+
+ (* Close the box for projector definition *)
+ F.pp_close_box fmt ();
+ (* Add breaks to insert new lines between definitions *)
+ F.pp_print_break fmt 0 0
+ in
+
+ FieldId.iteri extract_field_proj fields
+
+(** Auxiliary function.
+
Generate field projectors in Coq.
Sometimes we extract records as inductives in Coq: when this happens we
have to define the field projectors afterwards.
*)
-let extract_type_decl_record_field_projectors (ctx : extraction_ctx)
+let extract_type_decl_coq_record_field_projectors (ctx : extraction_ctx)
(fmt : F.formatter) (kind : decl_kind) (decl : type_decl) : unit =
sanity_check __FILE__ __LINE__ (!backend = Coq) decl.meta;
match decl.kind with
@@ -1826,7 +1947,13 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx)
let extract_type_decl_extra_info (ctx : extraction_ctx) (fmt : F.formatter)
(kind : decl_kind) (decl : type_decl) : unit =
match !backend with
- | FStar | Lean | HOL4 -> ()
+ | FStar | HOL4 -> ()
+ | Lean ->
+ if
+ not
+ (TypesUtils.type_decl_from_decl_id_is_tuple_struct
+ ctx.trans_ctx.type_ctx.type_infos decl.def_id)
+ then extract_type_decl_lean_record_field_projectors ctx fmt kind decl
| Coq ->
if
not
@@ -1834,7 +1961,7 @@ let extract_type_decl_extra_info (ctx : extraction_ctx) (fmt : F.formatter)
ctx.trans_ctx.type_ctx.type_infos decl.def_id)
then (
extract_type_decl_coq_arguments ctx fmt kind decl;
- extract_type_decl_record_field_projectors ctx fmt kind decl)
+ extract_type_decl_coq_record_field_projectors ctx fmt kind decl)
(** Extract the state type declaration. *)
let extract_state_type (fmt : F.formatter) (ctx : extraction_ctx)