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libguestfs/generator/erlang.ml
Richard W.M. Jones 02b64d5cec generator: Use quoted string literals in many places 
This change was done almost entirely automatically using the script
below.  This uses the OCaml lexer to read the source files and extract
the strings and locations.  Strings which are "candidates" (in this
case, longer than 3 lines) are replaced in the output with quoted
string literals.

Since the OCaml lexer is used, it already substitutes all escape
sequences correctly.  I diffed the output of the generator and it is
identical after this change, except for UUIDs, which change because of
how Utils.stable_uuid is implemented.

Thanks: Nicolas Ojeda Bar

$ ocamlfind opt -package unix,compiler-libs.common find_strings.ml \
                -o find_strings.opt -linkpkg
$ for f in $( git ls-files -- \*.ml ) ; do ./find_strings.opt $f ; done

open Printf

let read_whole_file path =
  let buf = Buffer.create 16384 in
  let chan = open_in path in
  let maxlen = 16384 in
  let b = Bytes.create maxlen in
  let rec loop () =
    let r = input chan b 0 maxlen in
    if r > 0 then (
      Buffer.add_substring buf (Bytes.to_string b) 0 r;
      loop ()
    )
  in
  loop ();
  close_in chan;
  Buffer.contents buf

let count_chars c str =
  let count = ref 0 in
  for i = 0 to String.length str - 1 do
    if c = String.unsafe_get str i then incr count
  done;
  !count

let subs = ref []

let consider_string str loc =
  let nr_lines = count_chars '\n' str in
  if nr_lines > 3 then
    subs := (str, loc) :: !subs

let () =
  Lexer.init ();
  let filename = Sys.argv.(1) in
  let content = read_whole_file filename in
  let lexbuf = Lexing.from_string content in
  let rec loop () =
    let token = Lexer.token lexbuf in
    (match token with
     | Parser.EOF -> ();
     | STRING (s, loc, sopt) ->
        consider_string s loc; (* sopt? *)
        loop ();
     | token ->
        loop ();
    )
  in
  loop ();

  (* The list of subs is already reversed, which is convenient
   * because we must the file substitutions in reverse order.
   *)
  let subs = !subs in
  let new_content = ref content in
  List.iter (
    fun (str, loc) ->
      let { Location.loc_start = { pos_cnum = p1 };
            loc_end = { pos_cnum = p2 } } = loc in
      let len = String.length !new_content in
      let before = String.sub !new_content 0 (p1-1) in
      let after = String.sub !new_content (p2+1) (len - p2 - 1) in
      new_content := before ^ "{|" ^ str ^ "|}" ^ after
  ) subs;

  let new_content = !new_content in

  if content <> new_content then (
    (* Update the file in place. *)
    let new_filename = filename ^ ".new"
    and backup_filename = filename ^ ".bak" in
    let chan = open_out new_filename in
    fprintf chan "%s" new_content;
    close_out chan;
    Unix.rename filename backup_filename;
    Unix.rename new_filename filename
  )
2025-09-01 17:08:52 +01:00

562 lines
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(* libguestfs
* Copyright (C) 2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*)
(* Please read generator/README first. *)
open Printf
open Std_utils
open Types
open Utils
open Pr
open Docstrings
open Optgroups
open Actions
open Structs
open C
open Events
let generate_header = generate_header ~inputs:["generator/erlang.ml"]
let rec generate_erlang_erl () =
generate_header ErlangStyle LGPLv2plus;
pr "-module(guestfs).\n";
pr "\n";
pr "-export([create/0, create/1, close/1, init/1]).\n";
pr "\n";
(* Export the public actions. *)
List.iter (
fun { name; style = _, args, optargs; non_c_aliases = aliases } ->
let nr_args = List.length args in
let export name =
if optargs = [] then
pr "-export([%s/%d]).\n" name (nr_args+1)
else
pr "-export([%s/%d, %s/%d]).\n" name (nr_args+1) name (nr_args+2)
in
export name;
List.iter export aliases
) (actions |> external_functions |> sort);
pr "\n";
pr {|create() ->
create("erl-guestfs").
create(ExtProg) ->
G = spawn(?MODULE, init, [ExtProg]),
{ok, G}.
close(G) ->
G ! close,
ok.
call_port(G, Args) ->
G ! {call, self(), Args},
receive
{guestfs, Result} ->
Result
end.
init(ExtProg) ->
process_flag(trap_exit, true),
Port = open_port({spawn, ExtProg}, [{packet, 4}, binary]),
loop(Port).
loop(Port) ->
receive
{call, Caller, Args} ->
Port ! { self(), {command, term_to_binary(Args)}},
receive
{Port, {data, Result}} ->
Caller ! { guestfs, binary_to_term(Result)}
end,
loop(Port);
close ->
port_close(Port),
exit(normal);
{ 'EXIT', Port, _ } ->
exit(port_terminated)
end.
|};
(* These bindings just marshal the parameters and call the back-end
* process which dispatches them to the port.
*)
List.iter (
fun { name; style = _, args, optargs; non_c_aliases = aliases } ->
pr "%s(G" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
if optargs <> [] then
pr ", Optargs";
pr ") ->\n";
pr " call_port(G, {%s" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
if optargs <> [] then
pr ", Optargs";
pr "}).\n";
(* For functions with optional arguments, make a variant that
* has no optarg array, which just calls the function above with
* an empty list as the final arg.
*)
if optargs <> [] then (
pr "%s(G" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
pr ") ->\n";
pr " %s(G" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
pr ", []";
pr ").\n"
);
(* Aliases. *)
List.iter (
fun alias ->
pr "%s(G" alias;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
if optargs <> [] then
pr ", Optargs";
pr ") ->\n";
pr " %s(G" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
if optargs <> [] then
pr ", Optargs";
pr ").\n";
if optargs <> [] then (
pr "%s(G" alias;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
pr ") ->\n";
pr " %s(G" name;
List.iter (
fun arg ->
pr ", %s" (String.capitalize_ascii (name_of_argt arg))
) args;
pr ").\n"
)
) aliases;
pr "\n"
) (actions |> external_functions |> sort)
and generate_erlang_actions_h () =
generate_header CStyle GPLv2plus;
pr {|#ifndef GUESTFS_ERLANG_ACTIONS_H_
#define GUESTFS_ERLANG_ACTIONS_H_
extern guestfs_h *g;
extern int dispatch (ei_x_buff *retbuff, const char *buff, int *index);
extern int make_error (ei_x_buff *retbuff, const char *funname);
extern int unknown_optarg (ei_x_buff *retbuff, const char *funname, const char *optargname);
extern int unknown_function (ei_x_buff *retbuff, const char *fun);
extern int make_string_list (ei_x_buff *buff, char **r);
extern int make_table (ei_x_buff *buff, char **r);
extern int make_bool (ei_x_buff *buff, int r);
extern int atom_equals (const char *atom, const char *name);
extern int decode_string_list (const char *buff, int *index, char ***res);
extern int decode_string (const char *buff, int *index, char **res);
extern int decode_binary (const char *buff, int *index, char **res, size_t *size);
extern int decode_bool (const char *buff, int *index, int *res);
extern int decode_int (const char *buff, int *index, int *res);
extern int decode_int64 (const char *buff, int *index, int64_t *res);
|};
let emit_copy_list_decl typ =
pr "int make_%s_list (ei_x_buff *buff, const struct guestfs_%s_list *%ss);\n"
typ typ typ;
in
List.iter (
fun { s_name = typ; s_cols = cols } ->
pr "int make_%s (ei_x_buff *buff, const struct guestfs_%s *%s);\n" typ typ typ;
) external_structs;
List.iter (
function
| typ, (RStructListOnly | RStructAndList) ->
emit_copy_list_decl typ
| typ, _ -> () (* empty *)
) (rstructs_used_by (actions |> external_functions));
pr "\n";
List.iter (
fun { name } ->
pr "int run_%s (ei_x_buff *retbuff, const char *buff, int *index);\n" name
) (actions |> external_functions |> sort);
pr "\n";
pr "#endif /* GUESTFS_ERLANG_ACTIONS_H_ */\n"
and generate_erlang_structs () =
generate_header CStyle GPLv2plus;
pr {|#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <ei.h>
#include "guestfs.h"
#include "guestfs-utils.h"
#include "actions.h"
|};
(* Struct copy functions. *)
let emit_copy_list_function typ =
pr "\n";
pr "int\n";
pr "make_%s_list (ei_x_buff *buff, const struct guestfs_%s_list *%ss)\n" typ typ typ;
pr "{\n";
pr " size_t len = %ss->len;\n" typ;
pr " size_t i;\n";
pr "\n";
pr " if (ei_x_encode_list_header (buff, len) != 0) return -1;\n";
pr " for (i = 0; i < len; ++i) {\n";
pr " if (make_%s (buff, &%ss->val[i]) != 0) return -1;\n" typ typ;
pr " }\n";
pr " if (len > 0)\n";
pr " if (ei_x_encode_empty_list (buff) != 0) return -1;\n";
pr "\n";
pr " return 0;\n";
pr "}\n";
in
List.iter (
fun { s_name = typ; s_cols = cols } ->
pr "\n";
pr "int\n";
pr "make_%s (ei_x_buff *buff, const struct guestfs_%s *%s)\n" typ typ typ;
pr "{\n";
pr " if (ei_x_encode_list_header (buff, %d) !=0) return -1;\n" (List.length cols);
pr "\n";
List.iteri (
fun i col ->
(match col with
| name, (FString|FDevice) ->
pr " if (ei_x_encode_string (buff, %s->%s) != 0) return -1;\n" typ name
| name, FBuffer ->
pr " if (ei_x_encode_string_len (buff, %s->%s, %s->%s_len) != 0) return -1;\n"
typ name typ name
| name, FUUID ->
pr " if (ei_x_encode_string_len (buff, %s->%s, 32) != 0) return -1;\n" typ name
| name, (FBytes|FInt64|FUInt64) ->
pr " if (ei_x_encode_longlong (buff, %s->%s) != 0) return -1;\n" typ name
| name, (FInt32|FUInt32) ->
pr " if (ei_x_encode_long (buff, %s->%s) != 0) return -1;\n" typ name
| name, FOptPercent ->
pr " if (%s->%s >= 0) {\n" typ name;
pr " if (ei_x_encode_double (buff, %s->%s) != 0) return -1;\n" typ name;
pr " } else {\n";
pr " if (ei_x_encode_atom (buff, \"undefined\") != 0) return -1;\n";
pr " }\n"
| name, FChar ->
pr " if (ei_x_encode_char (buff, %s->%s) != 0) return -1;\n" typ name
);
) cols;
if cols <> [] then (
pr "\n";
pr " if (ei_x_encode_empty_list (buff) != 0) return -1;\n"
);
pr "\n";
pr " return 0;\n";
pr "}\n";
) external_structs;
(* Emit a copy_TYPE_list function definition only if that function is used. *)
List.iter (
function
| typ, (RStructListOnly | RStructAndList) ->
(* generate the function for typ *)
emit_copy_list_function typ
| typ, _ -> () (* empty *)
) (rstructs_used_by (actions |> external_functions));
and generate_erlang_actions actions () =
generate_header CStyle GPLv2plus;
pr {|#include <config.h>
/* It is safe to call deprecated functions from this file. */
#define GUESTFS_NO_WARN_DEPRECATED
#undef GUESTFS_NO_DEPRECATED
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <ei.h>
#include "guestfs.h"
#include "guestfs-utils.h"
#include "actions.h"
|};
(* The wrapper functions. *)
List.iter (
fun { name; style = (ret, args, optargs as style);
c_function; c_optarg_prefix } ->
pr "\n";
pr "int\n";
pr "run_%s (ei_x_buff *retbuff, const char *buff, int *idx)\n" name;
pr "{\n";
List.iteri (
fun i ->
function
| String (_, n) ->
pr " CLEANUP_FREE char *%s;\n" n;
pr " if (decode_string (buff, idx, &%s) != 0) return -1;\n" n
| OptString n ->
pr " CLEANUP_FREE char *%s;\n" n;
pr " char %s_opt[MAXATOMLEN];\n" n;
pr " if (ei_decode_atom(buff, idx, %s_opt) == 0) {\n" n;
pr " if (atom_equals (%s_opt, \"undefined\"))\n" n;
pr " %s = NULL;\n" n;
pr " else\n";
pr " %s = %s_opt;\n" n n;
pr " } else {\n";
pr " if (decode_string (buff, idx, &%s) != 0) return -1;\n" n;
pr " }\n"
| BufferIn n ->
pr " CLEANUP_FREE char *%s;\n" n;
pr " size_t %s_size;\n" n;
pr " if (decode_binary (buff, idx, &%s, &%s_size) != 0) return -1;\n" n n
| StringList (_, n) ->
pr " CLEANUP_FREE_STRING_LIST char **%s;\n" n;
pr " if (decode_string_list (buff, idx, &%s) != 0) return -1;\n" n
| Bool n ->
pr " int %s;\n" n;
pr " if (decode_bool (buff, idx, &%s) != 0) return -1;\n" n
| Int n ->
pr " int %s;\n" n;
pr " if (decode_int (buff, idx, &%s) != 0) return -1;\n" n
| Int64 n ->
pr " int64_t %s;\n" n;
pr " if (decode_int64 (buff, idx, &%s) != 0) return -1;\n" n
| Pointer (t, n) ->
pr " void * /* %s */ %s = POINTER_NOT_IMPLEMENTED (\"%s\");\n" t n t
) args;
(* Optional arguments. *)
if optargs <> [] then (
pr "\n";
pr " struct %s optargs_s = { .bitmask = 0 };\n" c_function;
pr " struct %s *optargs = &optargs_s;\n" c_function;
pr " int optargsize;\n";
pr " if (ei_decode_list_header (buff, idx, &optargsize) != 0) return -1;\n";
pr " for (int i = 0; i < optargsize; i++) {\n";
pr " int hd;\n";
pr " if (ei_decode_tuple_header (buff, idx, &hd) != 0) return -1;\n";
pr " char hd_name[MAXATOMLEN];\n";
pr " if (ei_decode_atom (buff, idx, hd_name) != 0) return -1;\n";
pr "\n";
List.iter (
fun argt ->
let n = name_of_optargt argt in
let uc_n = String.uppercase_ascii n in
pr " if (atom_equals (hd_name, \"%s\")) {\n" n;
pr " optargs_s.bitmask |= %s_%s_BITMASK;\n"
c_optarg_prefix uc_n;
pr " ";
(match argt with
| OBool _ -> pr "if (decode_bool (buff, idx, &optargs_s.%s) != 0) return -1;" n
| OInt _ -> pr "if (decode_int (buff, idx, &optargs_s.%s) != 0) return -1" n
| OInt64 _ -> pr "if (decode_int64 (buff, idx, &optargs_s.%s) != 0) return -1" n
| OString _ -> pr "if (decode_string (buff, idx, (char **) &optargs_s.%s) != 0) return -1" n
| OStringList n -> pr "if (decode_string_list (buff, idx, (char ***) &optargs_s.%s) != 0) return -1" n
);
pr ";\n";
pr " }\n";
pr " else\n";
) optargs;
pr " return unknown_optarg (retbuff, \"%s\", hd_name);\n" name;
pr " }\n";
pr " if (optargsize > 0 && buff[*idx] == ERL_NIL_EXT)\n";
pr " (*idx)++;\n";
pr "\n";
);
(match ret with
| RErr -> pr " int r;\n"
| RInt _ -> pr " int r;\n"
| RInt64 _ -> pr " int64_t r;\n"
| RBool _ -> pr " int r;\n"
| RConstString _ | RConstOptString _ ->
pr " const char *r;\n"
| RString _ -> pr " char *r;\n"
| RStringList _ ->
pr " char **r;\n"
| RStruct (_, typ) ->
pr " struct guestfs_%s *r;\n" typ
| RStructList (_, typ) ->
pr " struct guestfs_%s_list *r;\n" typ
| RHashtable _ ->
pr " char **r;\n"
| RBufferOut _ ->
pr " char *r;\n";
pr " size_t size;\n"
);
pr "\n";
pr " r = %s " c_function;
generate_c_call_args ~handle:"g" style;
pr ";\n";
(* Free strings if we copied them above. *)
List.iter (
function
| OBool _ | OInt _ | OInt64 _ -> ()
| OString n ->
let uc_n = String.uppercase_ascii n in
pr " if ((optargs_s.bitmask & %s_%s_BITMASK))\n"
c_optarg_prefix uc_n;
pr " free ((char *) optargs_s.%s);\n" n
| OStringList n ->
let uc_n = String.uppercase_ascii n in
pr " if ((optargs_s.bitmask & %s_%s_BITMASK))\n"
c_optarg_prefix uc_n;
pr " guestfs_int_free_string_list ((char **) optargs_s.%s);\n" n
) optargs;
(match errcode_of_ret ret with
| `CannotReturnError -> ()
| `ErrorIsMinusOne ->
pr " if (r == -1)\n";
pr " return make_error (retbuff, \"%s\");\n" name;
| `ErrorIsNULL ->
pr " if (r == NULL)\n";
pr " return make_error (retbuff, \"%s\");\n" name;
);
pr "\n";
(match ret with
| RErr -> pr " if (ei_x_encode_atom (retbuff, \"ok\") != 0) return -1;\n"
| RInt _ -> pr " if (ei_x_encode_long (retbuff, r) != 0) return -1;\n"
| RInt64 _ -> pr " if (ei_x_encode_longlong (retbuff, r) != 0) return -1;\n"
| RBool _ -> pr " if (make_bool (retbuff, r) != 0) return -1;\n"
| RConstString _ -> pr " if (ei_x_encode_string (retbuff, r) != 0) return -1;\n"
| RConstOptString _ ->
pr " if (r) {\n";
pr " if (ei_x_encode_string (retbuff, r) != 0) return -1;\n";
pr " } else {\n";
pr " if (ei_x_encode_atom (retbuff, \"undefined\") != 0) return -1;\n";
pr " }\n"
| RString _ ->
pr " if (ei_x_encode_string (retbuff, r) != 0) return -1;\n";
pr " free (r);\n";
| RStringList _ ->
pr " if (make_string_list (retbuff, r) != 0) return -1;\n";
pr " guestfs_int_free_string_list (r);\n"
| RStruct (_, typ) ->
pr " if (make_%s (retbuff, r) != 0) return -1;\n" typ;
pr " guestfs_free_%s (r);\n" typ
| RStructList (_, typ) ->
pr " if (make_%s_list (retbuff, r) != 0) return -1;\n" typ;
pr " guestfs_free_%s_list (r);\n" typ
| RHashtable _ ->
pr " if (make_table (retbuff, r) != 0) return -1;\n";
pr " guestfs_int_free_string_list (r);\n"
| RBufferOut _ ->
pr " if (ei_x_encode_binary (retbuff, r, size) != 0) return -1;\n";
pr " free (r);\n";
);
pr " return 0;\n";
pr "}\n";
) (actions |> external_functions |> sort);
and generate_erlang_dispatch () =
generate_header CStyle GPLv2plus;
pr {|#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <ei.h>
#include "guestfs.h"
#include "guestfs-utils.h"
#include "actions.h"
int
dispatch (ei_x_buff *retbuff, const char *buff, int *index)
{
int arity;
char fun[MAXATOMLEN];
if (ei_decode_tuple_header (buff, index, &arity) != 0) return -1;
if (ei_decode_atom (buff, index, fun) != 0) return -1;
/* XXX We should use gperf here. */
|};
List.iter (
fun { name; style = ret, args, optargs } ->
pr "if (atom_equals (fun, \"%s\"))\n" name;
pr " return run_%s (retbuff, buff, index);\n" name;
pr " else ";
) (actions |> external_functions |> sort);
pr "return unknown_function (retbuff, fun);
}
";
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