(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Information attached to global variables. *)

Record globvar (V: Type) : Type := mkglobvar {
  gvar_info: V;                    (**r language-dependent info, e.g. a type *)
  gvar_init: list init_data;       (**r initialization data *)
  gvar_readonly: bool;             (**r read-only variable? (const) *)
  gvar_volatile: bool              (**r volatile variable? *)
}.(** Whole programs consist of:
- a collection of global definitions (name and description);
- a set of public names (the names that are visible outside
  this compilation unit);
- the name of the ``main'' function that serves as entry point in the program.

A global definition is either a global function or a global variable.
The type of function descriptions and that of additional information
for variables vary among the various intermediate languages and are
taken as parameters to the [program] type.  The other parts of whole
programs are common to all languages. *)

Inductive globdef (F V: Type) : Type :=
  | Gfun (f: F)
  | Gvar (v: globvar V).(** Whole programs consist of:
- a collection of global definitions (name and description);
- a set of public names (the names that are visible outside
  this compilation unit);
- the name of the ``main'' function that serves as entry point in the program.

A global definition is either a global function or a global variable.
The type of function descriptions and that of additional information
for variables vary among the various intermediate languages and are
taken as parameters to the [program] type.  The other parts of whole
programs are common to all languages. *)

Inductive globdef (F V: Type) : Type :=
  | Gfun (f: F)
  | Gvar (v: globvar V).(** Whole programs consist of:
- a collection of global definitions (name and description);
- a set of public names (the names that are visible outside
  this compilation unit);
- the name of the ``main'' function that serves as entry point in the program.

A global definition is either a global function or a global variable.
The type of function descriptions and that of additional information
for variables vary among the various intermediate languages and are
taken as parameters to the [program] type.  The other parts of whole
programs are common to all languages. *)

Inductive globdef (F V: Type) : Type :=
  | Gfun (f: F)
  | Gvar (v: globvar V).Record program (F V: Type) : Type := mkprogram {
  prog_defs: list (ident * globdef F V);
  prog_public: list ident;
  prog_main: ident
}.Record program (F V: Type) : Type := mkprogram {
  prog_defs: list (ident * globdef F V);
  prog_public: list ident;
  prog_main: ident
}.Record program (F V: Type) : Type := mkprogram {
  prog_defs: list (ident * globdef F V);
  prog_public: list ident;
  prog_main: ident
}.Record program (F V: Type) : Type := mkprogram {
  prog_defs: list (ident * globdef F V);
  prog_public: list ident;
  prog_main: ident
}.Record program (F V: Type) : Type := mkprogram {
  prog_defs: list (ident * globdef F V);
  prog_public: list ident;
  prog_main: ident
}.Definition prog_defs_names (F V: Type) (p: program F V) : list ident :=
  List.map fst p.(prog_defs).(** The "definition map" of a program maps names of globals to their definitions.
  If several definitions have the same name, the one appearing last in [p.(prog_defs)] wins. *)

Definition prog_defmap (F V: Type) (p: program F V) : PTree.t (globdef F V) :=
  PTree_Properties.of_list p.(prog_defs).Definition transform_program_globdef (idg: ident * globdef A V) : ident * globdef B V :=
  match idg with
  | (id, Gfun f) => (id, Gfun (transf f))
  | (id, Gvar v) => (id, Gvar v)
  end.Definition transform_program (p: program A V) : program B V :=
  mkprogram
    (List.map transform_program_globdef p.(prog_defs))
    p.(prog_public)
    p.(prog_main).Definition transform_partial_program (p: program A V) : res (program B V) :=
  transform_partial_program2 (fun i f => transf_fun f) (fun i v => OK v) p.

Lemma transform_program_partial_program: forall (A B V: Type) (transf_fun: A -> B) (p: program A V), transform_partial_program (fun f => OK (transf_fun f)) p = OK (transform_program transf_fun p).