diff options
Diffstat (limited to '')
| -rw-r--r-- | compiler/ExtractTypes.ml | 71 | ||||
| -rw-r--r-- | compiler/SymbolicToPure.ml | 5 |
2 files changed, 55 insertions, 21 deletions
diff --git a/compiler/ExtractTypes.ml b/compiler/ExtractTypes.ml index a2d4758b..cc0c351d 100644 --- a/compiler/ExtractTypes.ml +++ b/compiler/ExtractTypes.ml @@ -1666,14 +1666,15 @@ let extract_type_decl_coq_arguments (ctx : extraction_ctx) (fmt : F.formatter) (** Auxiliary function. - Generate field projectors in Coq. + Generate field projectors for Lean and Coq. - Sometimes we extract records as inductives in Coq: when this happens we - have to define the field projectors afterwards. + Recursive structs are defined as inductives in Lean and Coq. + Field projectors allow to retrieve the facilities provided by + Lean structures. *) let extract_type_decl_record_field_projectors (ctx : extraction_ctx) (fmt : F.formatter) (kind : decl_kind) (decl : type_decl) : unit = - sanity_check __FILE__ __LINE__ (!backend = Coq) decl.span; + sanity_check __FILE__ __LINE__ (!backend = Coq || !backend = Lean) decl.span; match decl.kind with | Opaque | Enum _ -> () | Struct fields -> @@ -1685,29 +1686,60 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx) ctx_add_generic_params decl.span 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.span "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.span "x" (VarId.of_int 1) ctx in + (* Name of the ADT *) let def_name = ctx_get_local_type decl.span 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.span (TAdtId decl.def_id) ctx in + let extract_field_proj (field_id : FieldId.id) (_ : field) : unit = F.pp_print_space fmt (); (* Outer box for the projector definition *) F.pp_open_hvbox fmt 0; (* Inner box for the projector definition *) F.pp_open_hvbox fmt ctx.indent_incr; - (* Open a box for the [Definition PROJ ... :=] *) + + (* For Lean: add some attributes *) + if !backend = Lean then ( + (* Box for the attributes *) + F.pp_open_vbox fmt 0; + (* Annotate the projectors with both simp and reducible. + The first one allows to automatically unfold when calling simp in proofs. + The second ensures that projectors will interact well with the unifier *) + F.pp_print_string fmt "@[simp, reducible]"; + F.pp_print_break fmt 0 0; + (* Close box for the attributes *) + F.pp_close_box fmt ()); + + (* Box for the [def ADT.proj ... :=] *) F.pp_open_hovbox fmt ctx.indent_incr; - F.pp_print_string fmt "Definition"; + (match !backend with + | Lean -> F.pp_print_string fmt "def" + | Coq -> F.pp_print_string fmt "Definition" + | _ -> internal_error __FILE__ __LINE__ decl.span); 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. In Coq, + we will have to introduce a notation for the projector. *) let field_name = ctx_get_field decl.span (TAdtId decl.def_id) field_id ctx in + if !backend = Lean then ( + 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.span ctx fmt TypeDeclId.Set.empty ~as_implicits decl.generics type_params cg_params trait_clauses; - (* Print the record parameter *) + + (* Print the record parameter as "(x : ADT)" *) F.pp_print_space fmt (); F.pp_print_string fmt "("; F.pp_print_string fmt record_var; @@ -1721,14 +1753,17 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx) 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 [Definition PROJ ... :=] *) + + (* 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"; @@ -1758,9 +1793,12 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx) F.pp_print_string fmt field_var; (* Close the box for the branch *) F.pp_close_box fmt (); + (* Print the [end] *) - F.pp_print_space fmt (); - F.pp_print_string fmt "end"; + if !backend = Coq then ( + F.pp_print_space fmt (); + F.pp_print_string fmt "end"); + (* Close the box for the whole match *) F.pp_close_box fmt (); (* Close the inner box projector *) @@ -1769,12 +1807,13 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx) if !backend = Coq then ( F.pp_print_cut fmt (); F.pp_print_string fmt "."); - (* Close the outer box projector *) + (* Close the outer 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 + (* Only for Coq: we need to define a notation for the projector *) let extract_proj_notation (field_id : FieldId.id) (_ : field) : unit = F.pp_print_space fmt (); (* Outer box for the projector definition *) @@ -1815,7 +1854,7 @@ let extract_type_decl_record_field_projectors (ctx : extraction_ctx) let extract_field_proj_and_notation (field_id : FieldId.id) (field : field) : unit = extract_field_proj field_id field; - extract_proj_notation field_id field + if !backend = Coq then extract_proj_notation field_id field in FieldId.iteri extract_field_proj_and_notation fields @@ -1828,14 +1867,14 @@ 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 -> () - | Coq -> + | FStar | HOL4 -> () + | Lean | Coq -> 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_coq_arguments ctx fmt kind decl; + if !backend = Coq then extract_type_decl_coq_arguments ctx fmt kind decl; extract_type_decl_record_field_projectors ctx fmt kind decl) (** Extract the state type declaration. *) diff --git a/compiler/SymbolicToPure.ml b/compiler/SymbolicToPure.ml index 8dfe0abe..d6d2e018 100644 --- a/compiler/SymbolicToPure.ml +++ b/compiler/SymbolicToPure.ml @@ -2903,14 +2903,9 @@ and translate_ExpandAdt_one_branch (sv : V.symbolic_value) - if the ADT is an enumeration (which must have exactly one branch) - if we forbid using field projectors. *) - let is_rec_def = - T.TypeDeclId.Set.mem adt_id ctx.type_ctx.recursive_decls - in let use_let_with_cons = is_enum || !Config.dont_use_field_projectors - (* TODO: for now, we don't have field projectors over recursive ADTs in Lean. *) - || (!Config.backend = Lean && is_rec_def) (* Also, there is a special case when the ADT is to be extracted as a tuple, because it is a structure with unnamed fields. Some backends like Lean have projectors for tuples (like so: `x.3`), but others |