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(**************************************************************************)
(* *)
(* Menhir *)
(* *)
(* Franois Pottier and Yann Rgis-Gianas, INRIA Rocquencourt *)
(* *)
(* Copyright 2005 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0, with the *)
(* change described in file LICENSE. *)
(* *)
(**************************************************************************)
open Syntax
open Stretch
open UnparameterizedSyntax
open IL
open CodeBits
open TokenType
(* ------------------------------------------------------------------------- *)
(* Naming conventions. *)
(* The type variable associated with a nonterminal symbol. Its name
begins with a prefix which ensures that it cannot clash with
Objective Caml keywords. *)
let ntvar symbol =
Printf.sprintf "tv_%s" (Misc.normalize symbol)
(* The name of the temporary file. *)
let base =
Settings.base
let mlname =
base ^ ".ml"
let mliname =
base ^ ".mli"
(* ------------------------------------------------------------------------- *)
(* Code production. *)
(* [nttype nt] is the type of the nonterminal [nt], as currently
known. *)
let nttype grammar nt =
try
TypTextual (StringMap.find nt grammar.types)
with Not_found ->
TypVar (ntvar nt)
(* [is_standard] determines whether a branch derives from a standard
library definition. The method, based on a file name, is somewhat
fragile. *)
let is_standard branch =
List.for_all (fun x -> x = Settings.stdlib_filename) (Action.filenames branch.action)
(* [actiondef] turns a branch into a function definition. *)
let actiondef grammar symbol branch =
(* Construct a list of the semantic action's formal parameters that
depend on the production's right-hand side. *)
let _, formals =
List.fold_left (fun (i, formals) (symbol, ido) ->
let id, startp, endp, starto, endo =
match ido with
| None ->
(* Symbols for which no name was chosen will be represented
by variables named _1, _2, etc. *)
Printf.sprintf "_%d" (i + 1),
Printf.sprintf "_startpos__%d_" (i + 1),
Printf.sprintf "_endpos__%d_" (i + 1),
Printf.sprintf "_startofs__%d_" (i + 1),
Printf.sprintf "_endofs__%d_" (i + 1)
| Some id ->
(* Symbols for which a name was explicitly chosen will be
known by that name in semantic actions. *)
id,
Printf.sprintf "_startpos_%s_" id,
Printf.sprintf "_endpos_%s_" id,
Printf.sprintf "_startofs_%s_" id,
Printf.sprintf "_endofs_%s_" id
in
let t =
try
let props = StringMap.find symbol grammar.tokens in
(* Symbol is a terminal. *)
match props.tk_ocamltype with
| None ->
tunit
| Some ocamltype ->
TypTextual ocamltype
with Not_found ->
(* Symbol is a nonterminal. *)
nttype grammar symbol
in
i + 1,
PAnnot (PVar id, t) ::
PAnnot (PVar startp, tposition) ::
PAnnot (PVar endp, tposition) ::
PAnnot (PVar starto, tint) ::
PAnnot (PVar endo, tint) ::
formals
) (0, []) branch.producers
in
(* Extend the list with parameters that do not depend on the
right-hand side. *)
let formals =
PAnnot (PVar "_previouserror", tint) ::
PAnnot (PVar "_eRR", texn) ::
PAnnot (PVar "_startpos", tposition) ::
PAnnot (PVar "_endpos", tposition) ::
PAnnot (PVar "_startofs", tint) ::
PAnnot (PVar "_endofs", tint) ::
formals
in
(* Construct a function definition out of the above bindings and the
semantic action. *)
let body =
EAnnot (
Action.to_il_expr branch.action,
type2scheme (nttype grammar symbol)
)
in
match formals with
| [] ->
body
| _ ->
EFun (formals, body)
(* [program] turns an entire grammar into a test program. *)
let program grammar =
(* Turn the grammar into a bunch of function definitions. Grammar
productions that derive from the standard library are reflected
first, so that type errors are not reported in them. *)
let bindings1, bindings2 =
StringMap.fold (fun symbol rule (bindings1, bindings2) ->
List.fold_left (fun (bindings1, bindings2) branch ->
if is_standard branch then
(PWildcard, actiondef grammar symbol branch) :: bindings1, bindings2
else
bindings1, (PWildcard, actiondef grammar symbol branch) :: bindings2
) (bindings1, bindings2) rule.branches
) grammar.rules ([], [])
in
(* Create entry points whose types are the unknowns that we are
looking for. *)
let ps, ts =
StringMap.fold (fun symbol _ (ps, ts) ->
PVar (Misc.normalize symbol) :: ps,
nttype grammar symbol :: ts
) grammar.rules ([], [])
in
let def = {
valpublic = true;
valpat = PTuple ps;
valval = ELet (bindings1 @ bindings2, EAnnot (bottom, type2scheme (TypTuple ts)))
}
in
(* Insert markers to delimit the part of the file that we are
interested in. These markers are recognized by [Lexmli]. This
helps skip the values, types, exceptions, etc. that might be
defined by the prologue or postlogue. *)
let begindef = {
valpublic = true;
valpat = PVar "menhir_begin_marker";
valval = EIntConst 0
}
and enddef = {
valpublic = true;
valpat = PVar "menhir_end_marker";
valval = EIntConst 0
} in
(* Issue the test program. We include the definition of the type of
tokens, because, in principle, the semantic actions may refer to
it or to its data constructors. *)
{
paramdefs = PreFront.grammar.parameters;
prologue = PreFront.grammar.preludes;
excdefs = [];
typedefs = tokentypedef;
nonrecvaldefs = [ begindef; def; enddef ];
valdefs = [];
postlogue = PreFront.grammar.postludes
}
(* ------------------------------------------------------------------------- *)
(* Writing the program associated with a grammar to a file. *)
let write grammar () =
let ml = open_out mlname in
let module P = Printer.Make (struct
let f = ml
let locate_stretches = Some mlname
let raw_stretch_action = false
end) in
P.program (program grammar);
close_out ml
let remove filename () =
Sys.remove filename
(* ------------------------------------------------------------------------- *)
(* Moving away and restoring a file. *)
let mover filename =
if Sys.file_exists filename then
let newname =
filename ^ ".moved_by_menhir"
in
let moveaway () =
Sys.rename filename newname
and restore () =
Sys.rename newname filename
in
moveaway, restore
else
let nothing () = () in
nothing, nothing
(* ------------------------------------------------------------------------- *)
(* Running ocamldep on the program. *)
type entry =
string (* basename *) * string (* filename *)
type line =
entry (* target *) * entry list (* dependencies *)
let depend grammar =
(* Create an [.ml] file and an [.mli] file, then invoke ocamldep to
compute dependencies for us. *)
(* If an old [.ml] or [.mli] file exists, we are careful to preserve
it. We temporarily move it out of the way and restore it when we
are done. There is no reason why dependency analysis should
destroy existing files. *)
let moveml, restoreml =
mover mlname
and movemli, restoremli =
mover mliname
in
let output =
IO.winvoke
[ moveml; movemli; write grammar; Interface.write ]
(Printf.sprintf "%s %s %s" Settings.ocamldep (Filename.quote mlname) (Filename.quote mliname))
[ remove mlname; remove mliname; restoreml; restoremli ]
in
(* Echo ocamldep's output. *)
print_string output;
(* If [--raw-depend] was specified on the command line, stop here.
This option is used by omake, which performs its own
postprocessing of [ocamldep]'s output. For normal [make] users,
who use [--depend], some postprocessing is required, which is
performed below. *)
begin match Settings.depend with
| Settings.OMNone ->
assert false (* we wouldn't be here in the first place *)
| Settings.OMRaw ->
()
| Settings.OMPostprocess ->
(* Make sense out of ocamldep's output. *)
let lexbuf = Lexing.from_string output in
let lines : line list = Lexdep.main lexbuf in
(* Look for the line that concerns the [.cmo] target, and echo a
modified version of this line, where the [.cmo] target is
replaced with [.ml] and [.mli] targets, and where the dependency
over the [.cmi] file is dropped.
In doing so, we assume that the user's [Makefile] supports
bytecode compilation, so that it makes sense to request [bar.cmo]
to be built, as opposed to [bar.cmx]. This is not optimal, but
will do. [camldep] exhibits the same behavior. *)
(* TEMPORARY allow ocamldep to be called with flag -native. *)
List.iter (fun ((_, target_filename), dependencies) ->
if Filename.check_suffix target_filename ".cmo" then
let dependencies = List.filter (fun (basename, _) ->
basename <> base
) dependencies in
if List.length dependencies > 0 then begin
Printf.printf "%s.ml %s.mli:" base base;
List.iter (fun (basename, filename) ->
Printf.printf " %s" filename
) dependencies;
Printf.printf "\n%!"
end
) lines
end;
(* Stop. *)
exit 0
(* ------------------------------------------------------------------------- *)
(* Inferring types for a grammar's nonterminals. *)
let infer grammar =
(* Invoke ocamlc to do type inference for us. *)
let output =
IO.winvoke
[ write grammar ]
(Printf.sprintf "%s -c -i %s" Settings.ocamlc (Filename.quote mlname))
[ remove mlname ]
in
(* Make sense out of ocamlc's output. *)
let env : (string * int * int) list =
Lexmli.main (Lexing.from_string output)
in
let env : (string * ocamltype) list =
List.map (fun (id, openingofs, closingofs) ->
id, Inferred (String.sub output openingofs (closingofs - openingofs))
) env
in
(* Augment the grammar with new %type declarations. *)
let types =
StringMap.fold (fun symbol _ types ->
let ocamltype =
try
List.assoc (Misc.normalize symbol) env
with Not_found ->
assert false
in
if StringMap.mem symbol grammar.types then
(* If there was a declared type, keep it. *)
types
else
(* Otherwise, insert the inferred type. *)
StringMap.add symbol ocamltype types
) grammar.rules grammar.types
in
{ grammar with types = types }
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