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|
(* libguestfs
* Copyright (C) 2009-2012 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 Types
open Utils
open Pr
open Docstrings
open Optgroups
open Actions
open Structs
let rec generate_haskell_hs () =
generate_header HaskellStyle LGPLv2plus;
(* XXX We only know how to generate partial FFI for Haskell
* at the moment. Please help out!
*)
let can_generate style =
match style with
| _, _, (_::_) -> false (* no optional args yet *)
| RErr, _, []
| RInt _, _, []
| RInt64 _, _, [] -> true
| RBool _, _, []
| RConstString _, _, []
| RConstOptString _, _, []
| RString _, _, []
| RStringList _, _, []
| RStruct _, _, []
| RStructList _, _, []
| RHashtable _, _, []
| RBufferOut _, _, [] -> false in
pr "\
{-# INCLUDE <guestfs.h> #-}
{-# LANGUAGE ForeignFunctionInterface #-}
module Guestfs (
create";
(* List out the names of the actions we want to export. *)
List.iter (
fun { name = name; style = style } ->
if can_generate style then pr ",\n %s" name
) all_functions;
pr "
) where
-- Unfortunately some symbols duplicate ones already present
-- in Prelude. We don't know which, so we hard-code a list
-- here.
import Prelude hiding (truncate)
import Foreign
import Foreign.C
import Foreign.C.Types
import System.IO
import Control.Exception
import Data.Typeable
data GuestfsS = GuestfsS -- represents the opaque C struct
type GuestfsP = Ptr GuestfsS -- guestfs_h *
type GuestfsH = ForeignPtr GuestfsS -- guestfs_h * with attached finalizer
-- XXX define properly later XXX
data PV = PV
data VG = VG
data LV = LV
data IntBool = IntBool
data Stat = Stat
data StatVFS = StatVFS
data Hashtable = Hashtable
foreign import ccall unsafe \"guestfs_create\" c_create
:: IO GuestfsP
foreign import ccall unsafe \"&guestfs_close\" c_close
:: FunPtr (GuestfsP -> IO ())
foreign import ccall unsafe \"guestfs_set_error_handler\" c_set_error_handler
:: GuestfsP -> Ptr CInt -> Ptr CInt -> IO ()
create :: IO GuestfsH
create = do
p <- c_create
c_set_error_handler p nullPtr nullPtr
h <- newForeignPtr c_close p
return h
foreign import ccall unsafe \"guestfs_last_error\" c_last_error
:: GuestfsP -> IO CString
-- last_error :: GuestfsH -> IO (Maybe String)
-- last_error h = do
-- str <- withForeignPtr h (\\p -> c_last_error p)
-- maybePeek peekCString str
last_error :: GuestfsH -> IO (String)
last_error h = do
str <- withForeignPtr h (\\p -> c_last_error p)
if (str == nullPtr)
then return \"no error\"
else peekCString str
";
(* Generate wrappers for each foreign function. *)
List.iter (
fun { name = name; style = (ret, args, optargs as style);
c_function = c_function } ->
if can_generate style then (
pr "foreign import ccall unsafe \"%s\" c_%s\n" c_function name;
pr " :: ";
generate_haskell_prototype ~handle:"GuestfsP" style;
pr "\n";
pr "\n";
pr "%s :: " name;
generate_haskell_prototype ~handle:"GuestfsH" ~hs:true style;
pr "\n";
pr "%s %s = do\n" name
(String.concat " " ("h" :: List.map name_of_argt args));
pr " r <- ";
(* Convert pointer arguments using with* functions. *)
List.iter (
function
| FileIn n
| FileOut n
| Pathname n | Device n | Dev_or_Path n | String n | Key n ->
pr "withCString %s $ \\%s -> " n n
| BufferIn n ->
pr "withCStringLen %s $ \\(%s, %s_size) -> " n n n
| OptString n -> pr "maybeWith withCString %s $ \\%s -> " n n
| StringList n | DeviceList n -> pr "withMany withCString %s $ \\%s -> withArray0 nullPtr %s $ \\%s -> " n n n n
| Bool _ | Int _ | Int64 _ | Pointer _ -> ()
) args;
(* Convert integer arguments. *)
let args =
List.map (
function
| Bool n -> sprintf "(fromBool %s)" n
| Int n -> sprintf "(fromIntegral %s)" n
| Int64 n | Pointer (_, n) -> sprintf "(fromIntegral %s)" n
| FileIn n | FileOut n
| Pathname n | Device n | Dev_or_Path n
| String n | OptString n
| StringList n | DeviceList n
| Key n -> n
| BufferIn n -> sprintf "%s (fromIntegral %s_size)" n n
) args in
pr "withForeignPtr h (\\p -> c_%s %s)\n" name
(String.concat " " ("p" :: args));
(match ret with
| RErr | RInt _ | RInt64 _ | RBool _ ->
pr " if (r == -1)\n";
pr " then do\n";
pr " err <- last_error h\n";
pr " fail err\n";
| RConstString _ | RConstOptString _ | RString _
| RStringList _ | RStruct _
| RStructList _ | RHashtable _ | RBufferOut _ ->
pr " if (r == nullPtr)\n";
pr " then do\n";
pr " err <- last_error h\n";
pr " fail err\n";
);
(match ret with
| RErr ->
pr " else return ()\n"
| RInt _ ->
pr " else return (fromIntegral r)\n"
| RInt64 _ ->
pr " else return (fromIntegral r)\n"
| RBool _ ->
pr " else return (toBool r)\n"
| RConstString _
| RConstOptString _
| RString _
| RStringList _
| RStruct _
| RStructList _
| RHashtable _
| RBufferOut _ ->
pr " else return ()\n" (* XXXXXXXXXXXXXXXXXXXX *)
);
pr "\n";
)
) all_functions
and generate_haskell_prototype ~handle ?(hs = false) (ret, args, optargs) =
pr "%s -> " handle;
let string = if hs then "String" else "CString" in
let int = if hs then "Int" else "CInt" in
let bool = if hs then "Bool" else "CInt" in
let int64 = if hs then "Integer" else "Int64" in
List.iter (
fun arg ->
(match arg with
| Pathname _ | Device _ | Dev_or_Path _ | String _ | Key _ ->
pr "%s" string
| BufferIn _ ->
if hs then pr "String"
else pr "CString -> CInt"
| OptString _ -> if hs then pr "Maybe String" else pr "CString"
| StringList _ | DeviceList _ -> if hs then pr "[String]" else pr "Ptr CString"
| Bool _ -> pr "%s" bool
| Int _ -> pr "%s" int
| Int64 _ -> pr "%s" int
| Pointer _ -> pr "%s" int
| FileIn _ -> pr "%s" string
| FileOut _ -> pr "%s" string
);
pr " -> ";
) args;
pr "IO (";
(match ret with
| RErr -> if not hs then pr "CInt"
| RInt _ -> pr "%s" int
| RInt64 _ -> pr "%s" int64
| RBool _ -> pr "%s" bool
| RConstString _ -> pr "%s" string
| RConstOptString _ -> pr "Maybe %s" string
| RString _ -> pr "%s" string
| RStringList _ -> pr "[%s]" string
| RStruct (_, typ) ->
let name = camel_name_of_struct typ in
pr "%s" name
| RStructList (_, typ) ->
let name = camel_name_of_struct typ in
pr "[%s]" name
| RHashtable _ -> pr "Hashtable"
| RBufferOut _ -> pr "%s" string
);
pr ")"
|
