Richard W.M. Jones
2019-Aug-09 12:59 UTC
[Libguestfs] [PATCH libnbd 0/2] generator: Preparatory changes to the generator.
These are some simplifications to the generator. They don't probably make much sense on their own, but they are preparatory to better handling of enums, and or'd lists of flags. Rich.
Richard W.M. Jones
2019-Aug-09 12:59 UTC
[Libguestfs] [PATCH libnbd 1/2] generator: Handle closure args (cbargs) specially.
If we accept that callbacks will never handle the full range of
parameters then we can simplify the generator quite a bit by using a
special type for closure args vs normal method args.
This removes many asserts and quite a bit of unreachable code
(eg. Python code for handling ArrayAndLen in normal methods that was
never used).
The output of the generator after this commit should be identical.
It's possible to go a little further if we wanted: CBArrayAndLen is
only ever used for ‘uint32_t’ arrays. CBMutable is only ever used for
‘int*’. We could make CB* types which only handle those cases.
---
generator/generator | 428 +++++++++++++++++++-------------------------
1 file changed, 186 insertions(+), 242 deletions(-)
diff --git a/generator/generator b/generator/generator
index 51f2a47..88c8fef 100755
--- a/generator/generator
+++ b/generator/generator
@@ -847,7 +847,6 @@ type call = {
first_version : int * int;
}
and arg -| ArrayAndLen of arg * string (* array + number of entries *)
| Bool of string (* bool *)
| BytesIn of string * string (* byte array + size passed in to the function *)
| BytesOut of string * string(* byte array + size specified by caller,
@@ -858,7 +857,6 @@ and arg | Flags of string (* NBD_CMD_FLAG_* flags
*)
| Int of string (* small int *)
| Int64 of string (* 64 bit signed int *)
-| Mutable of arg (* mutable argument, eg. int* *)
| Path of string (* filename or path *)
| SockAddrAndLen of string * string (* struct sockaddr * + socklen_t *)
| String of string (* string, cannot be NULL *)
@@ -866,10 +864,6 @@ and arg | UInt of string (* small unsigned int
*)
| UInt32 of string (* 32 bit unsigned int *)
| UInt64 of string (* 64 bit unsigned int *)
-and closure = {
- cbname : string; (* name of callback function *)
- cbargs : arg list; (* all closures return int for now *)
-}
and ret | RBool (* return a boolean, or error *)
| RStaticString (* return a static string (must be located in
@@ -881,6 +875,19 @@ and ret | RString (* return a newly
allocated string,
caller frees, NULL for error *)
| RUInt (* return a bitmask, no error possible *)
+and closure = {
+ cbname : string; (* name of callback function *)
+ cbargs : cbarg list; (* all closures return int for now *)
+}
+and cbarg +| CBArrayAndLen of arg * string (* array + number of entries *)
+| CBBytesIn of string * string (* like BytesIn *)
+| CBInt of string (* like Int *)
+| CBInt64 of string (* like Int64 *)
+| CBMutable of arg (* mutable argument, eg. int* *)
+| CBString of string (* like String *)
+| CBUInt of string (* like UInt *)
+| CBUInt64 of string (* like UInt64 *)
and permitted_state | Created (* can be called in the START
state *)
| Connecting (* can be called when connecting/handshaking *)
@@ -932,7 +939,7 @@ Return the state of the debug flag on this handle.";
"set_debug_callback", {
default_call with
args = [ Closure { cbname="debug";
- cbargs=[String "context"; String
"msg"] } ];
+ cbargs=[CBString "context"; CBString
"msg"] } ];
ret = RErr;
shortdesc = "set the debug callback";
longdesc = "\
@@ -1398,9 +1405,9 @@ protocol extensions).";
default_call with
args = [ BytesOut ("buf", "count"); UInt64
"offset";
Closure { cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset"; UInt
"status";
- Mutable (Int "error")] };
+ cbargs=[CBBytesIn ("subbuf",
"count");
+ CBUInt64 "offset"; CBUInt
"status";
+ CBMutable (Int "error")] };
Flags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
@@ -1591,11 +1598,11 @@ punching a hole.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="extent";
- cbargs=[String "metacontext";
- UInt64 "offset";
- ArrayAndLen (UInt32 "entries",
- "nr_entries");
- Mutable (Int "error")] };
+ cbargs=[CBString "metacontext";
+ CBUInt64 "offset";
+ CBArrayAndLen (UInt32 "entries",
+ "nr_entries");
+ CBMutable (Int "error")] };
Flags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
@@ -1774,7 +1781,7 @@ C<nbd_pread>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64
"offset";
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1795,10 +1802,10 @@ completed. Other parameters behave as documented in
C<nbd_pread>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64
"offset";
Closure { cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset";
- UInt "status";
- Mutable (Int "error")] };
+ cbargs=[CBBytesIn ("subbuf",
"count");
+ CBUInt64 "offset";
+ CBUInt "status";
+ CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1816,12 +1823,12 @@ documented in C<nbd_pread_structured>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64
"offset";
Closure { cbname="chunk";
- cbargs=[BytesIn ("subbuf", "count");
- UInt64 "offset";
- UInt "status";
- Mutable (Int "error")] };
+ cbargs=[CBBytesIn ("subbuf",
"count");
+ CBUInt64 "offset";
+ CBUInt "status";
+ CBMutable (Int "error")] };
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1857,7 +1864,7 @@ C<nbd_pwrite>.";
default_call with
args = [ BytesPersistIn ("buf", "count"); UInt64
"offset";
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1913,7 +1920,7 @@ Parameters behave as documented in
C<nbd_flush>.";
"aio_flush_callback", {
default_call with
args = [ Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1947,7 +1954,7 @@ Parameters behave as documented in
C<nbd_trim>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -1981,7 +1988,7 @@ Parameters behave as documented in
C<nbd_cache>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2015,7 +2022,7 @@ Parameters behave as documented in
C<nbd_zero>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2035,10 +2042,10 @@ Other parameters behave as documented in
C<nbd_zero>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="extent";
- cbargs=[String "metacontext"; UInt64
"offset";
- ArrayAndLen (UInt32 "entries",
+ cbargs=[CBString "metacontext"; CBUInt64
"offset";
+ CBArrayAndLen (UInt32 "entries",
"nr_entries");
- Mutable (Int "error")] };
+ CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -2055,12 +2062,12 @@ Parameters behave as documented in
C<nbd_block_status>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="extent";
- cbargs=[String "metacontext"; UInt64
"offset";
- ArrayAndLen (UInt32 "entries",
- "nr_entries");
- Mutable (Int "error")] };
+ cbargs=[CBString "metacontext"; CBUInt64
"offset";
+ CBArrayAndLen (UInt32 "entries",
+ "nr_entries");
+ CBMutable (Int "error")] };
Closure { cbname="completion";
- cbargs=[Mutable (Int "error")] };
+ cbargs=[CBMutable (Int "error")] };
Flags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
@@ -3142,8 +3149,8 @@ module C : sig
val generate_lib_unlocked_h : unit -> unit
val generate_lib_api_c : unit -> unit
val generate_docs_libnbd_api_pod : unit -> unit
- val print_arg_list : ?handle:bool -> ?valid_flag:bool ->
?user_data:bool ->
- ?types:bool -> arg list -> unit
+ val print_arg_list : ?handle:bool -> ?types:bool -> arg list -> unit
+ val print_cbarg_list : ?valid_flag:bool -> ?types:bool -> cbarg list
-> unit
val errcode_of_ret : ret -> string option
val type_of_ret : ret -> string
end = struct
@@ -3278,7 +3285,6 @@ let type_of_ret | RUInt -> "unsigned"
let rec name_of_arg = function
-| ArrayAndLen (arg, n) -> name_of_arg arg @ [n]
| Bool n -> [n]
| BytesIn (n, len) -> [n; len]
| BytesOut (n, len) -> [n; len]
@@ -3289,7 +3295,6 @@ let rec name_of_arg = function
| Flags n -> [n]
| Int n -> [n]
| Int64 n -> [n]
-| Mutable arg -> name_of_arg arg
| Path n -> [n]
| SockAddrAndLen (n, len) -> [n; len]
| String n -> [n]
@@ -3298,9 +3303,7 @@ let rec name_of_arg = function
| UInt32 n -> [n]
| UInt64 n -> [n]
-let rec print_arg_list ?(handle = false) ?(valid_flag = false)
- ?(user_data = false)
- ?(types = true) args +let rec print_arg_list ?(handle =
false) ?(types = true) args pr "(";
let comma = ref false in
if handle then (
@@ -3308,29 +3311,11 @@ let rec print_arg_list ?(handle = false) ?(valid_flag =
false)
if types then pr "struct nbd_handle *";
pr "h"
);
- if valid_flag then (
- if !comma then pr ", ";
- comma := true;
- if types then pr "unsigned ";
- pr "valid_flag";
- );
- if user_data then (
- if !comma then pr ", ";
- comma := true;
- if types then pr "void *";
- pr "user_data";
- );
List.iter (
fun arg ->
if !comma then pr ", ";
comma := true;
match arg with
- | ArrayAndLen (UInt32 n, len) ->
- if types then pr "uint32_t *";
- pr "%s, " n;
- if types then pr "size_t ";
- pr "%s" len
- | ArrayAndLen _ -> assert false
| Bool n ->
if types then pr "bool ";
pr "%s" n
@@ -3361,10 +3346,6 @@ let rec print_arg_list ?(handle = false) ?(valid_flag =
false)
| Int64 n ->
if types then pr "int64_t ";
pr "%s" n
- | Mutable (Int n) ->
- if types then pr "int *";
- pr "%s" n
- | Mutable arg -> assert false
| Path n
| String n ->
if types then pr "const char *";
@@ -3398,6 +3379,53 @@ let print_extern name args ret print_call name args
ret;
pr ";\n"
+let print_cbarg_list ?(valid_flag = true) ?(types = true) cbargs + pr
"(";
+ if valid_flag then (
+ if types then pr "unsigned ";
+ pr "valid_flag";
+ pr ", ";
+ );
+ if types then pr "void *";
+ pr "user_data";
+
+ List.iter (
+ fun cbarg ->
+ pr ", ";
+ match cbarg with
+ | CBArrayAndLen (UInt32 n, len) ->
+ if types then pr "uint32_t *";
+ pr "%s, " n;
+ if types then pr "size_t ";
+ pr "%s" len
+ | CBArrayAndLen _ -> assert false
+ | CBBytesIn (n, len) ->
+ if types then pr "const void *";
+ pr "%s, " n;
+ if types then pr "size_t ";
+ pr "%s" len
+ | CBInt n ->
+ if types then pr "int ";
+ pr "%s" n
+ | CBInt64 n ->
+ if types then pr "int64_t ";
+ pr "%s" n
+ | CBMutable (Int n) ->
+ if types then pr "int *";
+ pr "%s" n
+ | CBMutable arg -> assert false
+ | CBString n ->
+ if types then pr "const char *";
+ pr "%s" n
+ | CBUInt n ->
+ if types then pr "unsigned ";
+ pr "%s" n
+ | CBUInt64 n ->
+ if types then pr "uint64_t ";
+ pr "%s" n
+ ) cbargs;
+ pr ")"
+
(* Callback typedefs in <libnbd.h> *)
let print_closure_typedefs () let all_cls @@ -3411,7 +3439,7 @@ let
print_closure_typedefs () List.iter (
fun { cbname; cbargs } ->
pr "typedef int (*nbd_%s_callback) " cbname;
- print_arg_list ~valid_flag:true ~user_data:true cbargs;
+ print_cbarg_list cbargs;
pr ";\n";
) unique_cls;
pr "\n"
@@ -3625,7 +3653,6 @@ let generate_lib_api_c () pr " debug (h,
\"enter:";
List.iter (
function
- | ArrayAndLen _ -> assert false
| Bool n -> pr " %s=%%s" n
| BytesIn (n, count)
| BytesPersistIn (n, count)
@@ -3635,7 +3662,6 @@ let generate_lib_api_c () | Flags n -> pr "
%s=0x%%x" n
| Int n -> pr " %s=%%d" n
| Int64 n -> pr " %s=%%\" PRIi64 \"" n
- | Mutable arg -> assert false
| SockAddrAndLen (n, len) -> pr " %s=<sockaddr>
%s=%%d" n len
| Path n
| String n -> pr " %s=\\\"%%s\\\"" n
@@ -3647,7 +3673,6 @@ let generate_lib_api_c () pr "\"";
List.iter (
function
- | ArrayAndLen _ -> assert false
| Bool n -> pr ", %s ? \"true\" :
\"false\"" n
| BytesIn (_, count)
| BytesPersistIn (_, count)
@@ -3657,7 +3682,6 @@ let generate_lib_api_c () | Flags n -> pr
", %s" n
| Int n -> pr ", %s" n
| Int64 n -> pr ", %s" n
- | Mutable arg -> assert false
| SockAddrAndLen (_, len) -> pr ", (int) %s" len
| Path n | String n -> pr ", %s ? %s : \"NULL\"" n
n
| StringList n -> ()
@@ -4007,7 +4031,7 @@ let print_python_binding name { args; ret; may_set_error }
pr "/* Wrapper for %s callback of %s. */\n" cbname name;
pr "static int\n";
pr "%s_%s_wrapper " name cbname;
- C.print_arg_list ~valid_flag:true ~user_data:true cbargs;
+ C.print_cbarg_list cbargs;
pr "\n";
pr "{\n";
pr " int ret = 0;\n";
@@ -4017,14 +4041,14 @@ let print_python_binding name { args; ret; may_set_error
} pr " PyObject *py_args, *py_ret;\n";
List.iter (
function
- | ArrayAndLen (UInt32 n, len) ->
+ | CBArrayAndLen (UInt32 n, len) ->
pr " PyObject *py_%s = PyList_New (%s);\n" n len;
pr " for (size_t i = 0; i < %s; ++i)\n" len;
pr " PyList_SET_ITEM (py_%s, i, PyLong_FromUnsignedLong
(%s[i]));\n" n n
- | BytesIn _
- | Int _
- | Int64 _ -> ()
- | Mutable (Int n) ->
+ | CBBytesIn _
+ | CBInt _
+ | CBInt64 _ -> ()
+ | CBMutable (Int n) ->
pr " PyObject *py_%s_modname = PyUnicode_FromString
(\"ctypes\");\n" n;
pr " if (!py_%s_modname) { PyErr_PrintEx (0); return -1;
}\n" n;
pr " PyObject *py_%s_mod = PyImport_Import
(py_%s_modname);\n" n n;
@@ -4032,54 +4056,36 @@ let print_python_binding name { args; ret; may_set_error
} pr " if (!py_%s_mod) { PyErr_PrintEx (0); return -1;
}\n" n;
pr " PyObject *py_%s = PyObject_CallMethod (py_%s_mod,
\"c_int\", \"i\", *%s);\n" n n n;
pr " if (!py_%s) { PyErr_PrintEx (0); return -1; }\n"
n;
- | String _
- | UInt _
- | UInt64 _ -> ()
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBString _
+ | CBUInt _
+ | CBUInt64 _ -> ()
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
pr "\n";
pr " py_args = Py_BuildValue (\"(\"";
List.iter (
function
- | ArrayAndLen (UInt32 n, len) -> pr " \"O\""
- | BytesIn (n, len) -> pr " \"y#\""
- | Int n -> pr " \"i\""
- | Int64 n -> pr " \"L\""
- | Mutable (Int n) -> pr " \"O\""
- | String n -> pr " \"s\""
- | UInt n -> pr " \"I\""
- | UInt64 n -> pr " \"K\""
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBArrayAndLen (UInt32 n, len) -> pr " \"O\""
+ | CBBytesIn (n, len) -> pr " \"y#\""
+ | CBInt n -> pr " \"i\""
+ | CBInt64 n -> pr " \"L\""
+ | CBMutable (Int n) -> pr " \"O\""
+ | CBString n -> pr " \"s\""
+ | CBUInt n -> pr " \"I\""
+ | CBUInt64 n -> pr " \"K\""
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
pr " \")\"";
List.iter (
function
- | ArrayAndLen (UInt32 n, _) -> pr ", py_%s" n
- | BytesIn (n, len) -> pr ", %s, (int) %s" n len
- | Mutable (Int n) -> pr ", py_%s" n
- | Int n | Int64 n
- | String n
- | UInt n | UInt64 n -> pr ", %s" n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBArrayAndLen (UInt32 n, _) -> pr ", py_%s" n
+ | CBBytesIn (n, len) -> pr ", %s, (int) %s" n len
+ | CBMutable (Int n) -> pr ", py_%s" n
+ | CBInt n | CBInt64 n
+ | CBString n
+ | CBUInt n | CBUInt64 n -> pr ", %s" n
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
pr ");\n";
pr " Py_INCREF (py_args);\n";
@@ -4104,24 +4110,18 @@ let print_python_binding name { args; ret; may_set_error
} pr "\n";
List.iter (
function
- | ArrayAndLen (UInt32 n, _) ->
+ | CBArrayAndLen (UInt32 n, _) ->
pr " Py_DECREF (py_%s);\n" n
- | Mutable (Int n) ->
+ | CBMutable (Int n) ->
pr " PyObject *py_%s_ret = PyObject_GetAttrString (py_%s,
\"value\");\n" n n;
pr " *%s = PyLong_AsLong (py_%s_ret);\n" n n;
pr " Py_DECREF (py_%s_ret);\n" n;
pr " Py_DECREF (py_%s);\n" n
- | BytesIn _
- | Int _ | Int64 _
- | String _
- | UInt _ | UInt64 _ -> ()
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBBytesIn _
+ | CBInt _ | CBInt64 _
+ | CBString _
+ | CBUInt _ | CBUInt64 _ -> ()
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
pr " }\n";
pr "\n";
@@ -4144,11 +4144,6 @@ let print_python_binding name { args; ret; may_set_error
} pr " PyObject *py_ret;\n";
List.iter (
function
- | ArrayAndLen (UInt32 n, len) ->
- pr " PyObject *py_%s;\n" n;
- pr " uint32_t *%s;\n" n;
- pr " size_t %s;\n" len;
- | ArrayAndLen _ -> assert false
| Bool n -> pr " int %s;\n" n
| BytesIn (n, _) ->
pr " Py_buffer %s;\n" n
@@ -4169,7 +4164,6 @@ let print_python_binding name { args; ret; may_set_error }
| Int64 n ->
pr " int64_t %s_i64;\n" n;
pr " long long %s; /* really int64_t */\n" n
- | Mutable arg -> assert false
| Path n ->
pr " PyObject *py_%s = NULL;\n" n;
pr " char *%s = NULL;\n" n
@@ -4196,7 +4190,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " if (!PyArg_ParseTuple (args, (char *) \"O\"";
List.iter (
function
- | ArrayAndLen _ -> pr " \"O\""
| Bool n -> pr " \"b\""
| BytesIn (n, _) -> pr " \"y*\""
| BytesPersistIn (n, _) -> pr " \"O\""
@@ -4206,7 +4199,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags n -> pr " \"I\""
| Int n -> pr " \"i\""
| Int64 n -> pr " \"L\""
- | Mutable _ -> pr " \"O\""
| Path n -> pr " \"O&\""
| SockAddrAndLen (n, _) -> pr " \"O\""
| String n -> pr " \"s\""
@@ -4220,8 +4212,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " &py_h";
List.iter (
function
- | ArrayAndLen (UInt32 n, _) -> pr ", &py_%s" n
- | ArrayAndLen _ -> assert false
| Bool n -> pr ", &%s" n
| BytesIn (n, _) | BytesPersistIn (n, _)
| BytesPersistOut (n, _) -> pr ", &%s" n
@@ -4230,7 +4220,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags n -> pr ", &%s" n
| Int n -> pr ", &%s" n
| Int64 n -> pr ", &%s" n
- | Mutable arg -> assert false
| Path n -> pr ", PyUnicode_FSConverter, &py_%s" n
| SockAddrAndLen (n, _) -> pr ", &%s" n
| String n -> pr ", &%s" n
@@ -4245,24 +4234,6 @@ let print_python_binding name { args; ret; may_set_error
} pr " h = get_handle (py_h);\n";
List.iter (
function
- | ArrayAndLen (UInt32 n, len) ->
- pr " if (!PyList_Check (py_%s)) {\n" n;
- pr " PyErr_SetString (PyExc_TypeError, \"expecting a
list\");\n";
- pr " return NULL;\n";
- pr " }\n";
- pr " %s = PyList_Size (py_%s);\n" len n;
- pr " if (%s == -1) {\n" len;
- pr " PyErr_SetString (PyExc_RuntimeError, \"PyList_Size
failed\");\n";
- pr " return NULL;\n";
- pr " }\n";
- pr " %s = malloc (sizeof (uint32_t) * %s);\n" n len;
- pr " if (%s == NULL) {\n" n;
- pr " PyErr_NoMemory ();\n";
- pr " return NULL;\n";
- pr " }\n";
- pr " for (size_t _i = 0; _i < %s; ++_i)\n" len;
- pr " %s[_i] = PyLong_AsUnsignedLong (PyList_GetItem (%s,
_i));\n" n n
- | ArrayAndLen _ -> assert false
| Bool _ -> ()
| BytesIn _ -> ()
| BytesOut (n, count) ->
@@ -4280,8 +4251,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags n -> pr " %s_u32 = %s;\n" n n
| Int _ -> ()
| Int64 n -> pr " %s_i64 = %s;\n" n n
- | Mutable _ ->
- pr " abort (); /* Mutable for normal Python parameters not impl
*/\n"
| Path n ->
pr " %s = PyBytes_AS_STRING (py_%s);\n" n n;
pr " assert (%s != NULL);\n" n
@@ -4300,8 +4269,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " ret = nbd_%s (h" name;
List.iter (
function
- | ArrayAndLen (UInt32 n, len) -> pr ", %s, %s" n len
- | ArrayAndLen _ -> assert false
| Bool n -> pr ", %s" n
| BytesIn (n, _) -> pr ", %s.buf, %s.len" n n
| BytesOut (n, count) -> pr ", %s, %s" n count
@@ -4313,7 +4280,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags n -> pr ", %s_u32" n
| Int n -> pr ", %s" n
| Int64 n -> pr ", %s_i64" n
- | Mutable arg -> assert false
| Path n -> pr ", %s" n
| SockAddrAndLen (n, _) -> pr ", /* XXX */ (void *) %s, 0" n
| String n -> pr ", %s" n
@@ -4339,7 +4305,6 @@ let print_python_binding name { args; ret; may_set_error }
| BytesOut (n, count) ->
pr " py_ret = PyBytes_FromStringAndSize (%s, %s);\n" n count;
use_ret := false
- | ArrayAndLen _
| Bool _
| BytesIn _
| BytesPersistIn _ | BytesPersistOut _
@@ -4347,7 +4312,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags _
| Int _
| Int64 _
- | Mutable _
| Path _
| SockAddrAndLen _
| String _
@@ -4382,8 +4346,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " out:\n";
List.iter (
function
- | ArrayAndLen (UInt32 n, len) -> pr " free (%s);\n" n
- | ArrayAndLen _ -> assert false
| Bool _ -> ()
| BytesIn (n, _) -> pr " PyBuffer_Release (&%s);\n" n
| BytesPersistIn _ | BytesOut _ | BytesPersistOut _ -> ()
@@ -4391,7 +4353,6 @@ let print_python_binding name { args; ret; may_set_error }
| Flags _ -> ()
| Int _ -> ()
| Int64 _ -> ()
- | Mutable _ -> ()
| Path n ->
pr " Py_XDECREF (py_%s);\n" n
| SockAddrAndLen _ -> ()
@@ -4527,27 +4488,23 @@ class NBD (object):
fun (name, { args; shortdesc; longdesc }) ->
let args List.map (
- function
- | ArrayAndLen (UInt32 n, _) -> [n, None]
- | ArrayAndLen _ -> assert false
- | Bool n -> [n, None]
- | BytesIn (n, _) | BytesPersistIn (n, _) -> [n, None]
- | BytesPersistOut (n, _) -> [n, None]
- | BytesOut (_, count) -> [count, None]
- | Closure { cbname } -> [cbname, None]
- | Flags n -> [n, Some "0"]
- | Int n -> [n, None]
- | Int64 n -> [n, None]
- | Mutable arg -> assert false
- | Path n -> [n, None]
- | SockAddrAndLen (n, _) -> [n, None]
- | String n -> [n, None]
- | StringList n -> [n, None]
- | UInt n -> [n, None]
- | UInt32 n -> [n, None]
- | UInt64 n -> [n, None]
+ function
+ | Bool n -> n, None
+ | BytesIn (n, _) | BytesPersistIn (n, _) -> n, None
+ | BytesPersistOut (n, _) -> n, None
+ | BytesOut (_, count) -> count, None
+ | Closure { cbname } -> cbname, None
+ | Flags n -> n, Some "0"
+ | Int n -> n, None
+ | Int64 n -> n, None
+ | Path n -> n, None
+ | SockAddrAndLen (n, _) -> n, None
+ | String n -> n, None
+ | StringList n -> n, None
+ | UInt n -> n, None
+ | UInt32 n -> n, None
+ | UInt64 n -> n, None
) args in
- let args = List.flatten args in
let () let args = List.map (
function
@@ -4622,21 +4579,16 @@ let rec ocaml_fundecl_to_string args ret and
ocaml_arg_to_string = function
| OCamlHandle -> "t"
| OCamlFlags n -> sprintf "?%s:int32 list" n
- | OCamlArg (ArrayAndLen (t, _)) ->
- sprintf "%s array" (ocaml_arg_to_string (OCamlArg t))
| OCamlArg (Bool _) -> "bool"
| OCamlArg (BytesIn _) -> "bytes"
| OCamlArg (BytesPersistIn _) -> "Buffer.t"
| OCamlArg (BytesOut _) -> "bytes"
| OCamlArg (BytesPersistOut _) -> "Buffer.t"
| OCamlArg (Closure { cbargs }) ->
- sprintf "(%s)"
- (ocaml_fundecl_to_string (List.map (fun a -> OCamlArg a)
cbargs)
- RInt)
+ sprintf "(%s)" (ocaml_closuredecl_to_string cbargs)
| OCamlArg (Flags _) -> assert false (* see above *)
| OCamlArg (Int _) -> "int"
| OCamlArg (Int64 _) -> "int64"
- | OCamlArg (Mutable arg) -> ocaml_arg_to_string (OCamlArg arg) ^ "
ref"
| OCamlArg (Path _) -> "string"
| OCamlArg (SockAddrAndLen _) -> "string" (* XXX not impl *)
| OCamlArg (String _) -> "string"
@@ -4655,12 +4607,27 @@ and ocaml_ret_to_string = function
| RString -> "string"
| RUInt -> "int"
+and ocaml_closuredecl_to_string cbargs + let cbargs = List.map
ocaml_cbarg_to_string cbargs in
+ String.concat " -> " (cbargs @ ["int"])
+
+and ocaml_cbarg_to_string = function
+ | CBArrayAndLen (arg, _) ->
+ sprintf "%s array" (ocaml_arg_to_string (OCamlArg arg))
+ | CBBytesIn _ -> "bytes"
+ | CBInt _ -> "int"
+ | CBInt64 _ -> "int64"
+ | CBMutable arg ->
+ sprintf "%s ref" (ocaml_arg_to_string (OCamlArg arg))
+ | CBString _ -> "string"
+ | CBUInt _ -> "int"
+ | CBUInt64 _ -> "int64"
+
let rec name_of_ocaml_arg = function
| OCamlHandle -> "h"
| OCamlFlags n -> n
| OCamlArg a ->
match a with
- | ArrayAndLen (arg, n) -> name_of_ocaml_arg (OCamlArg arg)
| Bool n -> n
| BytesIn (n, len) -> n
| BytesOut (n, len) -> n
@@ -4670,7 +4637,6 @@ let rec name_of_ocaml_arg = function
| Flags n -> n
| Int n -> n
| Int64 n -> n
- | Mutable arg -> name_of_ocaml_arg (OCamlArg arg)
| Path n -> n
| SockAddrAndLen (n, len) -> n
| String n -> n
@@ -4839,23 +4805,17 @@ let print_ocaml_binding (name, { args; ret })
let argnames List.map (
function
- | ArrayAndLen (UInt32 n, _) | BytesIn (n, _)
- | Int n | Int64 n
- | Mutable (Int n) | String n | UInt n | UInt64 n ->
+ | CBArrayAndLen (UInt32 n, _) | CBBytesIn (n, _)
+ | CBInt n | CBInt64 n
+ | CBMutable (Int n) | CBString n | CBUInt n | CBUInt64 n ->
n ^ "v"
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Path _ | Mutable _
- | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs in
pr "/* Wrapper for %s callback of %s. */\n" cbname name;
pr "static int\n";
pr "%s_%s_wrapper_locked " name cbname;
- C.print_arg_list ~user_data:true cbargs;
+ C.print_cbarg_list ~valid_flag:false cbargs;
pr "\n";
pr "{\n";
pr " CAMLparam0 ();\n";
@@ -4869,30 +4829,24 @@ let print_ocaml_binding (name, { args; ret })
List.iter (
function
- | ArrayAndLen (UInt32 n, count) ->
+ | CBArrayAndLen (UInt32 n, count) ->
pr " %sv = nbd_internal_ocaml_alloc_int32_array (%s,
%s);\n"
n n count;
- | BytesIn (n, len) ->
+ | CBBytesIn (n, len) ->
pr " %sv = caml_alloc_string (%s);\n" n len;
pr " memcpy (String_val (%sv), %s, %s);\n" n n len
- | Int n | UInt n ->
+ | CBInt n | CBUInt n ->
pr " %sv = Val_int (%s);\n" n n
- | Int64 n ->
+ | CBInt64 n ->
pr " %sv = caml_copy_int64 (%s);\n" n n
- | String n ->
+ | CBString n ->
pr " %sv = caml_copy_string (%s);\n" n n
- | UInt64 n ->
+ | CBUInt64 n ->
pr " %sv = caml_copy_int64 (%s);\n" n n
- | Mutable (Int n) ->
+ | CBMutable (Int n) ->
pr " %sv = caml_alloc_tuple (1);\n" n;
pr " Store_field (%sv, 0, Val_int (*%s));\n" n n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
List.iteri (fun i n -> pr " args[%d] = %s;\n" i n)
argnames;
@@ -4904,22 +4858,16 @@ let print_ocaml_binding (name, { args; ret })
List.iter (
function
- | ArrayAndLen (UInt32 _, _)
- | BytesIn _
- | Int _
- | Int64 _
- | String _
- | UInt _
- | UInt64 _ -> ()
- | Mutable (Int n) ->
+ | CBArrayAndLen (UInt32 _, _)
+ | CBBytesIn _
+ | CBInt _
+ | CBInt64 _
+ | CBString _
+ | CBUInt _
+ | CBUInt64 _ -> ()
+ | CBMutable (Int n) ->
pr " *%s = Int_val (Field (%sv, 0));\n" n n
- (* The following not yet implemented for callbacks XXX *)
- | ArrayAndLen _ | Bool _ | BytesOut _
- | BytesPersistIn _ | BytesPersistOut _
- | Closure _
- | Flags _ | Mutable _
- | Path _ | SockAddrAndLen _ | StringList _
- | UInt32 _ -> assert false
+ | CBArrayAndLen _ | CBMutable _ -> assert false
) cbargs;
pr " if (Is_exception_result (rv)) {\n";
@@ -4942,7 +4890,7 @@ let print_ocaml_binding (name, { args; ret }) pr
"\n";
pr "static int\n";
pr "%s_%s_wrapper " name cbname;
- C.print_arg_list ~valid_flag:true ~user_data:true cbargs;
+ C.print_cbarg_list cbargs;
pr "\n";
pr "{\n";
pr " int ret = 0;\n";
@@ -4950,7 +4898,7 @@ let print_ocaml_binding (name, { args; ret }) pr
" if (valid_flag & LIBNBD_CALLBACK_VALID) {\n";
pr " caml_leave_blocking_section ();\n";
pr " ret = %s_%s_wrapper_locked " name cbname;
- C.print_arg_list ~user_data:true ~types:false cbargs;
+ C.print_cbarg_list ~valid_flag:false ~types:false cbargs;
pr ";\n";
pr " caml_enter_blocking_section ();\n";
pr " }\n";
@@ -5017,7 +4965,6 @@ let print_ocaml_binding (name, { args; ret }) pr
" %s = Flags_val (Field (%sv, 0));\n" n n;
pr " else /* None */\n";
pr " %s = 0;\n" n
- | OCamlArg (ArrayAndLen (t, _)) -> (* XXX *) ()
| OCamlArg (Bool n) ->
pr " bool %s = Bool_val (%sv);\n" n n
| OCamlArg (BytesIn (n, count)) ->
@@ -5049,7 +4996,6 @@ let print_ocaml_binding (name, { args; ret }) pr
" int %s = Int_val (%sv);\n" n n
| OCamlArg (Int64 n) ->
pr " int64_t %s = Int64_val (%sv);\n" n n
- | OCamlArg (Mutable _) -> assert false
| OCamlArg (Path n) | OCamlArg (String n) ->
pr " const char *%s = String_val (%sv);\n" n n
| OCamlArg (SockAddrAndLen (n, len)) ->
@@ -5099,7 +5045,6 @@ let print_ocaml_binding (name, { args; ret }) |
OCamlArg (StringList n) -> pr " free (%s);\n" n
| OCamlHandle
| OCamlFlags _
- | OCamlArg (ArrayAndLen _)
| OCamlArg (Bool _)
| OCamlArg (BytesIn _)
| OCamlArg (BytesPersistIn _)
@@ -5109,7 +5054,6 @@ let print_ocaml_binding (name, { args; ret }) |
OCamlArg (Flags _)
| OCamlArg (Int _)
| OCamlArg (Int64 _)
- | OCamlArg (Mutable _)
| OCamlArg (Path _)
| OCamlArg (String _)
| OCamlArg (SockAddrAndLen _)
--
2.22.0
Richard W.M. Jones
2019-Aug-09 12:59 UTC
[Libguestfs] [PATCH libnbd 2/2] generator: Change handling of Flags to be a true optional argument.
In libguestfs generator we have the concept of optargs which is
different from plain arguments. These are mapped to optional
arguments in languages that support them such as Python.
This commit adds a new concept of optargs. At the moment it is simply
limited to handling the optional (in some bindings) flags parameter
which is used to handle the NBD_CMD_FLAG_* flags.
If present, the old Flags parameter becomes OFlags and is moved into
the optargs list.
For the OCaml generation this change simplifies things considerably as
we no longer need the mapping from C arg to ocaml_arg (they are now
the same).
In the libguestfs C bindings the handling of optargs is rather
complex, and I don't intend to replicate that here. Instead they are
just handled as non-optional arguments appearing after the normal
arguments.
Note this commit does not change the API in any language.
---
generator/generator | 505 +++++++++++++++++++++++---------------------
1 file changed, 259 insertions(+), 246 deletions(-)
diff --git a/generator/generator b/generator/generator
index 88c8fef..44e861b 100755
--- a/generator/generator
+++ b/generator/generator
@@ -824,6 +824,7 @@ and structured_reply_state_machine = [
type call = {
args : arg list; (* parameters (except handle) *)
+ optargs : optarg list; (* optional parameters (not optional in C) *)
ret : ret; (* return value *)
shortdesc : string; (* short description *)
longdesc : string; (* long description *)
@@ -854,7 +855,6 @@ and arg | BytesPersistIn of string * string (* same as
above, but buffer persists *)
| BytesPersistOut of string * string
| Closure of closure (* function pointer + void *opaque *)
-| Flags of string (* NBD_CMD_FLAG_* flags *)
| Int of string (* small int *)
| Int64 of string (* 64 bit signed int *)
| Path of string (* filename or path *)
@@ -864,6 +864,8 @@ and arg | UInt of string (* small unsigned int *)
| UInt32 of string (* 32 bit unsigned int *)
| UInt64 of string (* 64 bit unsigned int *)
+and optarg +| OFlags of string (* NBD_CMD_FLAG_* flags *)
and ret | RBool (* return a boolean, or error *)
| RStaticString (* return a static string (must be located in
@@ -895,7 +897,7 @@ and permitted_state not
including CLOSED or DEAD *)
| Closed | Dead (* can be called when the handle is CLOSED or DEAD
*)
-let default_call = { args = []; ret = RErr;
+let default_call = { args = []; optargs = []; ret = RErr;
shortdesc = ""; longdesc = "";
permitted_states = [];
is_locked = true; may_set_error = true;
@@ -1384,7 +1386,8 @@ Returns the size in bytes of the NBD export."
"pread", {
default_call with
- args = [ BytesOut ("buf", "count"); UInt64
"offset"; Flags "flags" ];
+ args = [ BytesOut ("buf", "count"); UInt64
"offset" ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server";
@@ -1407,8 +1410,8 @@ protocol extensions).";
Closure { cbname="chunk";
cbargs=[CBBytesIn ("subbuf",
"count");
CBUInt64 "offset"; CBUInt
"status";
- CBMutable (Int "error")] };
- Flags "flags" ];
+ CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server";
@@ -1481,7 +1484,8 @@ actually obeys the flag.";
"pwrite", {
default_call with
- args = [ BytesIn ("buf", "count"); UInt64
"offset"; Flags "flags" ];
+ args = [ BytesIn ("buf", "count"); UInt64
"offset" ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "write to the NBD server";
@@ -1501,7 +1505,7 @@ C<nbd_can_fua>).";
"shutdown", {
default_call with
- args = [ Flags "flags" ]; ret = RErr;
+ args = []; optargs = [ OFlags "flags" ]; ret = RErr;
permitted_states = [ Connected ];
shortdesc = "disconnect from the NBD server";
longdesc = "\
@@ -1521,7 +1525,7 @@ protocol extensions).";
"flush", {
default_call with
- args = [ Flags "flags" ]; ret = RErr;
+ args = []; optargs = [ OFlags "flags" ]; ret = RErr;
permitted_states = [ Connected ];
shortdesc = "send flush command to the NBD server";
longdesc = "\
@@ -1536,7 +1540,8 @@ protocol extensions).";
"trim", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "send trim command to the NBD server";
@@ -1556,7 +1561,8 @@ C<nbd_can_fua>).";
"cache", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "send cache (prefetch) command to the NBD server";
@@ -1574,7 +1580,8 @@ protocol extensions).";
"zero", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "send write zeroes command to the NBD server";
@@ -1602,8 +1609,8 @@ punching a hole.";
CBUInt64 "offset";
CBArrayAndLen (UInt32 "entries",
"nr_entries");
- CBMutable (Int "error")] };
- Flags "flags" ];
+ CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RErr;
permitted_states = [ Connected ];
shortdesc = "send block status command to the NBD server";
@@ -1762,8 +1769,8 @@ on the connection.";
"aio_pread", {
default_call with
- args = [ BytesPersistOut ("buf", "count"); UInt64
"offset";
- Flags "flags" ];
+ args = [ BytesPersistOut ("buf", "count"); UInt64
"offset" ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server";
@@ -1781,8 +1788,8 @@ C<nbd_pread>.";
default_call with
args = [ BytesPersistOut ("buf", "count"); UInt64
"offset";
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server, with callback on
completion";
@@ -1805,8 +1812,8 @@ completed. Other parameters behave as documented in
C<nbd_pread>.";
cbargs=[CBBytesIn ("subbuf",
"count");
CBUInt64 "offset";
CBUInt "status";
- CBMutable (Int "error")] };
- Flags "flags" ];
+ CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server";
@@ -1828,8 +1835,8 @@ documented in C<nbd_pread_structured>.";
CBUInt "status";
CBMutable (Int "error")] };
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "read from the NBD server, with callback on
completion";
@@ -1846,7 +1853,8 @@ Other parameters behave as documented in
C<nbd_pread_structured>.";
"aio_pwrite", {
default_call with
- args = [ BytesPersistIn ("buf", "count"); UInt64
"offset"; Flags "flags" ];
+ args = [ BytesPersistIn ("buf", "count"); UInt64
"offset" ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "write to the NBD server";
@@ -1864,8 +1872,8 @@ C<nbd_pwrite>.";
default_call with
args = [ BytesPersistIn ("buf", "count"); UInt64
"offset";
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "write to the NBD server, with callback on
completion";
@@ -1883,7 +1891,7 @@ completed. Other parameters behave as documented in
C<nbd_pwrite>.";
"aio_disconnect", {
default_call with
- args = [ Flags "flags" ]; ret = RErr;
+ args = []; optargs = [ OFlags "flags" ]; ret = RErr;
permitted_states = [ Connected ];
shortdesc = "disconnect from the NBD server";
longdesc = "\
@@ -1906,7 +1914,7 @@ however, C<nbd_shutdown> will call this function if
appropriate.";
"aio_flush", {
default_call with
- args = [ Flags "flags" ]; ret = RInt64;
+ args = []; optargs = [ OFlags "flags" ]; ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send flush command to the NBD server";
longdesc = "\
@@ -1920,8 +1928,8 @@ Parameters behave as documented in
C<nbd_flush>.";
"aio_flush_callback", {
default_call with
args = [ Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send flush command to the NBD server, with callback on
completion";
@@ -1938,7 +1946,8 @@ Other parameters behave as documented in
C<nbd_flush>.";
"aio_trim", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send trim command to the NBD server";
@@ -1954,8 +1963,8 @@ Parameters behave as documented in
C<nbd_trim>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send trim command to the NBD server, with callback on
completion";
@@ -1972,7 +1981,8 @@ Other parameters behave as documented in
C<nbd_trim>.";
"aio_cache", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send cache (prefetch) command to the NBD server";
@@ -1988,8 +1998,8 @@ Parameters behave as documented in
C<nbd_cache>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send cache (prefetch) command to the NBD server, with
callback on completion";
@@ -2006,7 +2016,8 @@ Other parameters behave as documented in
C<nbd_cache>.";
"aio_zero", {
default_call with
- args = [ UInt64 "count"; UInt64 "offset"; Flags
"flags" ];
+ args = [ UInt64 "count"; UInt64 "offset" ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send write zeroes command to the NBD server";
@@ -2022,8 +2033,8 @@ Parameters behave as documented in
C<nbd_zero>.";
default_call with
args = [ UInt64 "count"; UInt64 "offset";
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send write zeroes command to the NBD server, with
callback on completion";
@@ -2045,8 +2056,8 @@ Other parameters behave as documented in
C<nbd_zero>.";
cbargs=[CBString "metacontext"; CBUInt64
"offset";
CBArrayAndLen (UInt32 "entries",
"nr_entries");
- CBMutable (Int "error")] };
- Flags "flags" ];
+ CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send block status command to the NBD server";
@@ -2067,8 +2078,8 @@ Parameters behave as documented in
C<nbd_block_status>.";
"nr_entries");
CBMutable (Int "error")] };
Closure { cbname="completion";
- cbargs=[CBMutable (Int "error")] };
- Flags "flags" ];
+ cbargs=[CBMutable (Int "error")] } ];
+ optargs = [ OFlags "flags" ];
ret = RInt64;
permitted_states = [ Connected ];
shortdesc = "send block status command to the NBD server, with
callback on completion";
@@ -3149,7 +3160,8 @@ module C : sig
val generate_lib_unlocked_h : unit -> unit
val generate_lib_api_c : unit -> unit
val generate_docs_libnbd_api_pod : unit -> unit
- val print_arg_list : ?handle:bool -> ?types:bool -> arg list -> unit
+ val print_arg_list : ?handle:bool -> ?types:bool ->
+ arg list -> optarg list -> unit
val print_cbarg_list : ?valid_flag:bool -> ?types:bool -> cbarg list
-> unit
val errcode_of_ret : ret -> string option
val type_of_ret : ret -> string
@@ -3157,17 +3169,14 @@ end = struct
(* Check the API definition. *)
let () - (* Flags must only appear once in the final argument position. *)
+ (* Currently optargs can only be [] or [OFlags]. This condition
+ * will be relaxed later when we support more optional arguments.
+ *)
List.iter (
- fun (name, { args }) ->
- let args = List.rev args in
- match args with
- | [] -> ()
- | Flags _ :: xs
- | xs ->
- if List.exists (function Flags _ -> true | _ -> false) xs then
- failwithf "%s: Flags must appear in final argument position
only"
- name
+ function
+ | _, { optargs = [] } | _, { optargs = [OFlags _] } -> ()
+ | (name, _) ->
+ failwithf "%s: optargs can only be empty list of [OFlags]"
name
) handle_calls;
(* Closures must be uniquely named across all calls. *)
@@ -3292,7 +3301,6 @@ let rec name_of_arg = function
| BytesPersistOut (n, len) -> [n; len]
| Closure { cbname } ->
[ sprintf "%s_callback" cbname; sprintf "%s_user_data"
cbname ]
-| Flags n -> [n]
| Int n -> [n]
| Int64 n -> [n]
| Path n -> [n]
@@ -3303,7 +3311,7 @@ let rec name_of_arg = function
| UInt32 n -> [n]
| UInt64 n -> [n]
-let rec print_arg_list ?(handle = false) ?(types = true) args +let rec
print_arg_list ?(handle = false) ?(types = true) args optargs pr
"(";
let comma = ref false in
if handle then (
@@ -3337,9 +3345,6 @@ let rec print_arg_list ?(handle = false) ?(types = true)
args pr ", ";
if types then pr "void *";
pr "%s_user_data" cbname
- | Flags n ->
- if types then pr "uint32_t ";
- pr "%s" n
| Int n ->
if types then pr "int ";
pr "%s" n
@@ -3368,15 +3373,24 @@ let rec print_arg_list ?(handle = false) ?(types = true)
args if types then pr "uint64_t ";
pr "%s" n
) args;
+ List.iter (
+ fun optarg ->
+ if !comma then pr ", ";
+ comma := true;
+ match optarg with
+ | OFlags n ->
+ if types then pr "uint32_t ";
+ pr "%s" n
+ ) optargs;
pr ")"
-let print_call name args ret +let print_call name args optargs ret pr
"%s nbd_%s " (type_of_ret ret) name;
- print_arg_list ~handle:true args
+ print_arg_list ~handle:true args optargs
-let print_extern name args ret +let print_extern name args optargs ret pr
"extern ";
- print_call name args ret;
+ print_call name args optargs ret;
pr ";\n"
let print_cbarg_list ?(valid_flag = true) ?(types = true) cbargs @@ -3444,9
+3458,9 @@ let print_closure_typedefs () ) unique_cls;
pr "\n"
-let print_extern_and_define name args ret +let print_extern_and_define name
args optargs ret let name_upper = String.uppercase_ascii name in
- print_extern name args ret;
+ print_extern name args optargs ret;
pr "#define LIBNBD_HAVE_NBD_%s 1\n" name_upper;
pr "\n"
@@ -3511,7 +3525,8 @@ let generate_include_libnbd_h () pr "\n";
print_closure_typedefs ();
List.iter (
- fun (name, { args; ret }) -> print_extern_and_define name args ret
+ fun (name, { args; optargs; ret }) ->
+ print_extern_and_define name args optargs ret
) handle_calls;
List.iter (
fun (ns, ctxts) -> print_ns ns ctxts
@@ -3529,8 +3544,8 @@ let generate_lib_unlocked_h () pr "#define
LIBNBD_UNLOCKED_H\n";
pr "\n";
List.iter (
- fun (name, { args; ret }) ->
- print_extern ("unlocked_" ^ name) args ret
+ fun (name, { args; optargs; ret }) ->
+ print_extern ("unlocked_" ^ name) args optargs ret
) handle_calls;
pr "\n";
pr "#endif /* LIBNBD_UNLOCKED_H */\n"
@@ -3554,7 +3569,7 @@ let permitted_state_text permitted_states *)
let generate_lib_api_c () (* Print the wrapper added around all API calls.
*)
- let rec print_wrapper (name, {args; ret; permitted_states;
+ let rec print_wrapper (name, {args; optargs; ret; permitted_states;
is_locked; may_set_error}) if permitted_states
<> [] then (
pr "static inline bool\n";
@@ -3588,7 +3603,7 @@ let generate_lib_api_c () let ret_c_type =
type_of_ret ret and errcode = errcode_of_ret ret in
pr "%s\n" ret_c_type;
pr "nbd_%s " name;
- print_arg_list ~handle:true args;
+ print_arg_list ~handle:true args optargs;
pr "\n";
pr "{\n";
pr " %s ret;\n" ret_c_type;
@@ -3602,7 +3617,7 @@ let generate_lib_api_c () if is_locked then
pr " pthread_mutex_lock (&h->lock);\n";
if may_set_error then (
- print_trace_enter args;
+ print_trace_enter args optargs;
pr "\n"
);
if permitted_states <> [] then (
@@ -3630,7 +3645,7 @@ let generate_lib_api_c () | _ -> ()
) args;
pr " ret = nbd_unlocked_%s " name;
- print_arg_list ~types:false ~handle:true args;
+ print_arg_list ~types:false ~handle:true args optargs;
pr ";\n";
if may_set_error then (
pr "\n";
@@ -3649,7 +3664,7 @@ let generate_lib_api_c () pr "\n"
(* Print the trace when we enter a call with debugging enabled. *)
- and print_trace_enter args + and print_trace_enter args optargs pr
" debug (h, \"enter:";
List.iter (
function
@@ -3659,7 +3674,6 @@ let generate_lib_api_c () | BytesOut (n, count)
| BytesPersistOut (n, count) -> pr " %s=<buf> %s=%%zu"
n count
| Closure { cbname } -> pr " %s=<fun>" cbname
- | Flags n -> pr " %s=0x%%x" n
| Int n -> pr " %s=%%d" n
| Int64 n -> pr " %s=%%\" PRIi64 \"" n
| SockAddrAndLen (n, len) -> pr " %s=<sockaddr>
%s=%%d" n len
@@ -3670,6 +3684,10 @@ let generate_lib_api_c () | UInt32 n -> pr
" %s=%%\" PRIu32 \"" n
| UInt64 n -> pr " %s=%%\" PRIu64 \"" n
) args;
+ List.iter (
+ function
+ | OFlags n -> pr " %s=0x%%x" n
+ ) optargs;
pr "\"";
List.iter (
function
@@ -3679,7 +3697,6 @@ let generate_lib_api_c () | BytesOut (_, count)
| BytesPersistOut (_, count) -> pr ", %s" count
| Closure { cbname } -> ()
- | Flags n -> pr ", %s" n
| Int n -> pr ", %s" n
| Int64 n -> pr ", %s" n
| SockAddrAndLen (_, len) -> pr ", (int) %s" len
@@ -3687,6 +3704,10 @@ let generate_lib_api_c () | StringList n -> ()
| UInt n | UInt32 n | UInt64 n -> pr ", %s" n
) args;
+ List.iter (
+ function
+ | OFlags n -> pr ", %s" n
+ ) optargs;
pr ");\n"
(* Print the trace when we leave a call with debugging enabled. *)
and print_trace_leave ret @@ -3728,13 +3749,14 @@ let generate_lib_api_c ()
pr "\n";
List.iter print_wrapper handle_calls
-let print_api (name, { args; ret; permitted_states; shortdesc; longdesc;
+let print_api (name, { args; optargs; ret; permitted_states;
+ shortdesc; longdesc;
may_set_error }) pr "=head2 %s —\n" name;
pr "%s\n" shortdesc;
pr "\n";
pr " ";
- print_call name args ret; pr ";";
+ print_call name args optargs ret; pr ";";
pr "\n";
pr "\n";
pr "%s\n" longdesc;
@@ -4020,7 +4042,7 @@ PyInit_libnbdmod (void)
}
"
-let print_python_binding name { args; ret; may_set_error } +let
print_python_binding name { args; optargs; ret; may_set_error } (* Functions
with a Closure parameter are special because we
* have to generate wrapper functions which translate the
* callbacks back to Python.
@@ -4157,9 +4179,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " struct py_aio_buffer *%s_buf;\n" n
| Closure { cbname } ->
pr " PyObject *%s_user_data;\n" cbname
- | Flags n ->
- pr " uint32_t %s_u32;\n" n;
- pr " unsigned int %s; /* really uint32_t */\n" n
| Int n -> pr " int %s;\n" n
| Int64 n ->
pr " int64_t %s_i64;\n" n;
@@ -4184,6 +4203,12 @@ let print_python_binding name { args; ret; may_set_error
} pr " uint64_t %s_u64;\n" n;
pr " unsigned long long %s; /* really uint64_t */\n" n
) args;
+ List.iter (
+ function
+ | OFlags n ->
+ pr " uint32_t %s_u32;\n" n;
+ pr " unsigned int %s; /* really uint32_t */\n" n
+ ) optargs;
pr "\n";
(* Parse the Python parameters. *)
@@ -4196,7 +4221,6 @@ let print_python_binding name { args; ret; may_set_error }
| BytesOut (_, count) -> pr " \"n\""
| BytesPersistOut (_, count) -> pr " \"O\""
| Closure _ -> pr " \"O\""
- | Flags n -> pr " \"I\""
| Int n -> pr " \"i\""
| Int64 n -> pr " \"L\""
| Path n -> pr " \"O&\""
@@ -4207,6 +4231,10 @@ let print_python_binding name { args; ret; may_set_error
} | UInt32 n -> pr " \"I\""
| UInt64 n -> pr " \"K\""
) args;
+ List.iter (
+ function
+ | OFlags n -> pr " \"I\""
+ ) optargs;
pr "\n";
pr " \":nbd_%s\",\n" name;
pr " &py_h";
@@ -4217,7 +4245,6 @@ let print_python_binding name { args; ret; may_set_error }
| BytesPersistOut (n, _) -> pr ", &%s" n
| BytesOut (_, count) -> pr ", &%s" count
| Closure { cbname } -> pr ", &%s_user_data" cbname
- | Flags n -> pr ", &%s" n
| Int n -> pr ", &%s" n
| Int64 n -> pr ", &%s" n
| Path n -> pr ", PyUnicode_FSConverter, &py_%s" n
@@ -4228,6 +4255,10 @@ let print_python_binding name { args; ret; may_set_error
} | UInt32 n -> pr ", &%s" n
| UInt64 n -> pr ", &%s" n
) args;
+ List.iter (
+ function
+ | OFlags n -> pr ", &%s" n
+ ) optargs;
pr "))\n";
pr " return NULL;\n";
@@ -4248,7 +4279,6 @@ let print_python_binding name { args; ret; may_set_error }
pr " \"callback parameter %s is not
callable\");\n" cbname;
pr " return NULL;\n";
pr " }\n"
- | Flags n -> pr " %s_u32 = %s;\n" n n
| Int _ -> ()
| Int64 n -> pr " %s_i64 = %s;\n" n n
| Path n ->
@@ -4264,6 +4294,10 @@ let print_python_binding name { args; ret; may_set_error
} | UInt32 n -> pr " %s_u32 = %s;\n" n n
| UInt64 n -> pr " %s_u64 = %s;\n" n n
) args;
+ List.iter (
+ function
+ | OFlags n -> pr " %s_u32 = %s;\n" n n
+ ) optargs;
(* Call the underlying C function. *)
pr " ret = nbd_%s (h" name;
@@ -4277,7 +4311,6 @@ let print_python_binding name { args; ret; may_set_error }
| Closure { cbname } ->
pr ", %s_%s_wrapper" name cbname;
pr ", %s_user_data" cbname
- | Flags n -> pr ", %s_u32" n
| Int n -> pr ", %s" n
| Int64 n -> pr ", %s_i64" n
| Path n -> pr ", %s" n
@@ -4288,6 +4321,10 @@ let print_python_binding name { args; ret; may_set_error
} | UInt32 n -> pr ", %s_u32" n
| UInt64 n -> pr ", %s_u64" n
) args;
+ List.iter (
+ function
+ | OFlags n -> pr ", %s_u32" n
+ ) optargs;
pr ");\n";
if may_set_error then (
pr " if (ret == %s) {\n"
@@ -4309,7 +4346,6 @@ let print_python_binding name { args; ret; may_set_error }
| BytesIn _
| BytesPersistIn _ | BytesPersistOut _
| Closure _
- | Flags _
| Int _
| Int64 _
| Path _
@@ -4350,7 +4386,6 @@ let print_python_binding name { args; ret; may_set_error }
| BytesIn (n, _) -> pr " PyBuffer_Release (&%s);\n" n
| BytesPersistIn _ | BytesOut _ | BytesPersistOut _ -> ()
| Closure _ -> ()
- | Flags _ -> ()
| Int _ -> ()
| Int64 _ -> ()
| Path n ->
@@ -4485,34 +4520,35 @@ class NBD (object):
";
List.iter (
- fun (name, { args; shortdesc; longdesc }) ->
+ fun (name, { args; optargs; shortdesc; longdesc }) ->
let args List.map (
function
- | Bool n -> n, None
- | BytesIn (n, _) | BytesPersistIn (n, _) -> n, None
- | BytesPersistOut (n, _) -> n, None
- | BytesOut (_, count) -> count, None
- | Closure { cbname } -> cbname, None
- | Flags n -> n, Some "0"
- | Int n -> n, None
- | Int64 n -> n, None
- | Path n -> n, None
- | SockAddrAndLen (n, _) -> n, None
- | String n -> n, None
- | StringList n -> n, None
- | UInt n -> n, None
- | UInt32 n -> n, None
- | UInt64 n -> n, None
+ | Bool n -> n
+ | BytesIn (n, _) | BytesPersistIn (n, _) -> n
+ | BytesPersistOut (n, _) -> n
+ | BytesOut (_, count) -> count
+ | Closure { cbname } -> cbname
+ | Int n -> n
+ | Int64 n -> n
+ | Path n -> n
+ | SockAddrAndLen (n, _) -> n
+ | String n -> n
+ | StringList n -> n
+ | UInt n -> n
+ | UInt32 n -> n
+ | UInt64 n -> n
) args in
- let () - let args = List.map (
+ let optargs + List.map (
function
- | n, None -> sprintf ", %s" n
- | n, Some def -> sprintf ", %s=%s" n def
- ) args in
- let args = String.concat "" args in
- pr " def %s (self%s):\n" name args in
+ | OFlags n -> n, "0"
+ ) optargs in
+ let () + let params = args @ List.map (fun (n, def) -> n ^
"=" ^ def) optargs in
+ let params = List.map ((^) ", ") params in
+ let params = String.concat "" params in
+ pr " def %s (self%s):\n" name params in
let () let longdesc = Str.global_replace py_fn_rex
"C<nbd." longdesc in
let longdesc = Str.global_replace py_const_rex "C<"
longdesc in
@@ -4520,10 +4556,10 @@ class NBD (object):
pr " '''▶ %s\n\n%s'''\n"
shortdesc (String.concat "\n" longdesc) in
let () - let args = List.map fst args in
- let args = List.map ((^) ", ") args in
- let args = String.concat "" args in
- pr " return libnbdmod.%s (self._o%s)\n" name args in
+ let vars = args @ List.map fst optargs in
+ let vars = List.map ((^) ", ") vars in
+ let vars = String.concat "" vars in
+ pr " return libnbdmod.%s (self._o%s)\n" name vars in
pr "\n"
) handle_calls;
@@ -4541,7 +4577,10 @@ end
(*----------------------------------------------------------------------*)
-(* OCaml bindings. *)
+(* OCaml bindings.
+ *
+ * Note we always pass the parameters as: optargs, handle, args.
+ *)
module OCaml : sig
val generate_ocaml_nbd_mli : unit -> unit
@@ -4549,53 +4588,31 @@ module OCaml : sig
val generate_ocaml_nbd_c : unit -> unit
end = struct
-(* We convert the list of generic args to an OCaml-specific list
- * because the mapping between them is complicated.
- *)
-type ocaml_arg - | OCamlHandle (* The NBD handle (NBD.t) *)
- | OCamlFlags of string (* Optional ?flags parameter *)
- | OCamlArg of arg (* Other arg (string = name). *)
-
-let args_to_ocaml_args args - (* Flags argument, if present, is always placed
first. *)
- let flags, args - match List.rev args with
- | Flags n :: rest -> Some (OCamlFlags n), List.rev rest
- | _ -> None, args in
- let args - List.map (fun a -> OCamlArg a) args in
- match flags with
- | Some f -> f :: OCamlHandle :: args
- | None -> OCamlHandle :: args
-
(* String representation of args and return value. *)
-let rec ocaml_fundecl_to_string args ret +let rec ocaml_fundecl_to_string args
optargs ret + let optargs = List.map ocaml_optarg_to_string optargs in
let args = List.map ocaml_arg_to_string args in
let ret = ocaml_ret_to_string ret in
- String.concat " -> " (args @ [ret])
+ String.concat " -> " (optargs @ ["t"] @ args @ [ret])
(* String representation of a single OCaml arg. *)
and ocaml_arg_to_string = function
- | OCamlHandle -> "t"
- | OCamlFlags n -> sprintf "?%s:int32 list" n
- | OCamlArg (Bool _) -> "bool"
- | OCamlArg (BytesIn _) -> "bytes"
- | OCamlArg (BytesPersistIn _) -> "Buffer.t"
- | OCamlArg (BytesOut _) -> "bytes"
- | OCamlArg (BytesPersistOut _) -> "Buffer.t"
- | OCamlArg (Closure { cbargs }) ->
+ | Bool _ -> "bool"
+ | BytesIn _ -> "bytes"
+ | BytesPersistIn _ -> "Buffer.t"
+ | BytesOut _ -> "bytes"
+ | BytesPersistOut _ -> "Buffer.t"
+ | Closure { cbargs } ->
sprintf "(%s)" (ocaml_closuredecl_to_string cbargs)
- | OCamlArg (Flags _) -> assert false (* see above *)
- | OCamlArg (Int _) -> "int"
- | OCamlArg (Int64 _) -> "int64"
- | OCamlArg (Path _) -> "string"
- | OCamlArg (SockAddrAndLen _) -> "string" (* XXX not impl *)
- | OCamlArg (String _) -> "string"
- | OCamlArg (StringList _) -> "string list"
- | OCamlArg (UInt _) -> "int"
- | OCamlArg (UInt32 _) -> "int32"
- | OCamlArg (UInt64 _) -> "int64"
+ | Int _ -> "int"
+ | Int64 _ -> "int64"
+ | Path _ -> "string"
+ | SockAddrAndLen _ -> "string" (* XXX not impl *)
+ | String _ -> "string"
+ | StringList _ -> "string list"
+ | UInt _ -> "int"
+ | UInt32 _ -> "int32"
+ | UInt64 _ -> "int64"
and ocaml_ret_to_string = function
| RBool -> "bool"
@@ -4607,43 +4624,47 @@ and ocaml_ret_to_string = function
| RString -> "string"
| RUInt -> "int"
+and ocaml_optarg_to_string = function
+ | OFlags n -> sprintf "?%s:int32 list" n
+
and ocaml_closuredecl_to_string cbargs let cbargs = List.map
ocaml_cbarg_to_string cbargs in
String.concat " -> " (cbargs @ ["int"])
and ocaml_cbarg_to_string = function
| CBArrayAndLen (arg, _) ->
- sprintf "%s array" (ocaml_arg_to_string (OCamlArg arg))
+ sprintf "%s array" (ocaml_arg_to_string arg)
| CBBytesIn _ -> "bytes"
| CBInt _ -> "int"
| CBInt64 _ -> "int64"
| CBMutable arg ->
- sprintf "%s ref" (ocaml_arg_to_string (OCamlArg arg))
+ sprintf "%s ref" (ocaml_arg_to_string arg)
| CBString _ -> "string"
| CBUInt _ -> "int"
| CBUInt64 _ -> "int64"
-let rec name_of_ocaml_arg = function
- | OCamlHandle -> "h"
- | OCamlFlags n -> n
- | OCamlArg a ->
- match a with
- | Bool n -> n
- | BytesIn (n, len) -> n
- | BytesOut (n, len) -> n
- | BytesPersistIn (n, len) -> n
- | BytesPersistOut (n, len) -> n
- | Closure { cbname } -> cbname
- | Flags n -> n
- | Int n -> n
- | Int64 n -> n
- | Path n -> n
- | SockAddrAndLen (n, len) -> n
- | String n -> n
- | StringList n -> n
- | UInt n -> n
- | UInt32 n -> n
- | UInt64 n -> n
+let ocaml_name_of_arg = function
+ | Bool n -> n
+ | BytesIn (n, len) -> n
+ | BytesOut (n, len) -> n
+ | BytesPersistIn (n, len) -> n
+ | BytesPersistOut (n, len) -> n
+ | Closure { cbname } -> cbname
+ | Int n -> n
+ | Int64 n -> n
+ | Path n -> n
+ | SockAddrAndLen (n, len) -> n
+ | String n -> n
+ | StringList n -> n
+ | UInt n -> n
+ | UInt32 n -> n
+ | UInt64 n -> n
+
+let ocaml_name_of_optarg = function
+ | OFlags n -> n
+
+let num_params args optargs + List.length optargs + 1 (* handle *) +
List.length args
let generate_ocaml_nbd_mli () generate_header OCamlStyle;
@@ -4726,9 +4747,8 @@ val close : t -> unit
";
List.iter (
- fun (name, { args; ret; shortdesc; longdesc }) ->
- pr "val %s : %s\n" name
- (ocaml_fundecl_to_string (args_to_ocaml_args args) ret);
+ fun (name, { args; optargs; ret; shortdesc; longdesc }) ->
+ pr "val %s : %s\n" name (ocaml_fundecl_to_string args optargs
ret);
pr "(** %s\n" shortdesc;
pr "\n";
@@ -4785,19 +4805,18 @@ external close : t -> unit =
\"nbd_internal_ocaml_nbd_close\"
";
List.iter (
- fun (name, { args; ret }) ->
- let oargs = args_to_ocaml_args args in
- pr "external %s : %s\n" name (ocaml_fundecl_to_string oargs
ret);
+ fun (name, { args; optargs; ret }) ->
+ pr "external %s : %s\n" name (ocaml_fundecl_to_string args
optargs ret);
pr " = ";
(* In OCaml, argument lists longer than 5 elements require
* special handling in the C bindings.
*)
- if List.length oargs > 5 then
+ if num_params args optargs > 5 then
pr "\"nbd_internal_ocaml_nbd_%s_byte\" " name;
pr "\"nbd_internal_ocaml_nbd_%s\"\n" name
) handle_calls
-let print_ocaml_binding (name, { args; ret }) +let print_ocaml_binding (name, {
args; optargs; ret }) (* Functions with a callback parameter require special
handling. *)
List.iter (
function
@@ -4914,26 +4933,22 @@ let print_ocaml_binding (name, { args; ret }) | _
-> ()
) args;
- (* Convert the generic args to OCaml args. *)
- let oargs = args_to_ocaml_args args in
+ (* Get the names of all the value arguments including the handle. *)
+ let values + List.map ocaml_name_of_optarg optargs @ ["h"] @
+ List.map ocaml_name_of_arg args in
+ let values = List.map (fun v -> v ^ "v") values in
(* Create the binding. *)
pr "value\n";
- pr "nbd_internal_ocaml_nbd_%s (" name;
- let comma = ref false in
- List.iter (
- fun oarg ->
- if !comma then pr ", ";
- comma := true;
- pr "value %sv" (name_of_ocaml_arg oarg)
- ) oargs;
- pr ")";
- pr "\n";
+ let params = List.map (sprintf "value %s") values in
+ let params = String.concat ", " params in
+ pr "nbd_internal_ocaml_nbd_%s (%s)\n" name params;
pr "{\n";
(* CAMLparam<N> can only take up to 5 parameters. Further parameters
* have to be passed in groups of 5 to CAMLxparam<N> calls.
*)
- (match List.map (fun oarg -> name_of_ocaml_arg oarg ^ "v") oargs
with
+ (match values with
| p1 :: p2 :: p3 :: p4 :: p5 :: rest ->
pr " CAMLparam5 (%s);\n" (String.concat ", " [p1;
p2; p3; p4; p5]);
let rec loop = function
@@ -4953,35 +4968,40 @@ let print_ocaml_binding (name, { args; ret }) pr
" CAMLlocal1 (rv);\n";
pr "\n";
+ pr " struct nbd_handle *h = NBD_val (hv);\n";
+ pr " if (h == NULL)\n";
+ pr " nbd_internal_ocaml_raise_closed (\"NBD.%s\");\n"
name;
+ pr "\n";
+
List.iter (
function
- | OCamlHandle ->
- pr " struct nbd_handle *h = NBD_val (hv);\n";
- pr " if (h == NULL)\n";
- pr " nbd_internal_ocaml_raise_closed
(\"NBD.%s\");\n" name
- | OCamlFlags n ->
+ | OFlags n ->
pr " uint32_t %s;\n" n;
pr " if (%sv != Val_int (0)) /* Some flags */\n" n;
pr " %s = Flags_val (Field (%sv, 0));\n" n n;
pr " else /* None */\n";
pr " %s = 0;\n" n
- | OCamlArg (Bool n) ->
+ ) optargs;
+
+ List.iter (
+ function
+ | Bool n ->
pr " bool %s = Bool_val (%sv);\n" n n
- | OCamlArg (BytesIn (n, count)) ->
+ | BytesIn (n, count) ->
pr " const void *%s = Bytes_val (%sv);\n" n n;
pr " size_t %s = caml_string_length (%sv);\n" count n
- | OCamlArg (BytesPersistIn (n, count)) ->
+ | BytesPersistIn (n, count) ->
pr " struct nbd_buffer *%s_buf = NBD_buffer_val (%sv);\n" n
n;
pr " const void *%s = %s_buf->data;\n" n n;
pr " size_t %s = %s_buf->len;\n" count n
- | OCamlArg (BytesOut (n, count)) ->
+ | BytesOut (n, count) ->
pr " void *%s = Bytes_val (%sv);\n" n n;
pr " size_t %s = caml_string_length (%sv);\n" count n
- | OCamlArg (BytesPersistOut (n, count)) ->
+ | BytesPersistOut (n, count) ->
pr " struct nbd_buffer *%s_buf = NBD_buffer_val (%sv);\n" n
n;
pr " void *%s = %s_buf->data;\n" n n;
pr " size_t %s = %s_buf->len;\n" count n
- | OCamlArg (Closure { cbname }) ->
+ | Closure { cbname } ->
pr " /* The function may save a reference to the closure, so
we\n";
pr " * must treat it as a possible GC root.\n";
pr " */\n";
@@ -4991,33 +5011,32 @@ let print_ocaml_binding (name, { args; ret }) pr
" *%s_user_data = %sv;\n" cbname cbname;
pr " caml_register_generational_global_root
(%s_user_data);\n" cbname;
pr " const void *%s_callback = %s_%s_wrapper;\n" cbname name
cbname
- | OCamlArg (Flags _) -> assert false (* see above *)
- | OCamlArg (Int n) ->
+ | Int n ->
pr " int %s = Int_val (%sv);\n" n n
- | OCamlArg (Int64 n) ->
+ | Int64 n ->
pr " int64_t %s = Int64_val (%sv);\n" n n
- | OCamlArg (Path n) | OCamlArg (String n) ->
+ | Path n | String n ->
pr " const char *%s = String_val (%sv);\n" n n
- | OCamlArg (SockAddrAndLen (n, len)) ->
+ | SockAddrAndLen (n, len) ->
pr " const struct sockaddr *%s;\n" n;
pr " socklen_t %s;\n" len;
pr " abort ();\n" (* XXX *)
- | OCamlArg (StringList n) ->
+ | StringList n ->
pr " char **%s = nbd_internal_ocaml_string_list (%sv);\n" n n
- | OCamlArg (UInt n) ->
+ | UInt n ->
pr " unsigned %s = Int_val (%sv);\n" n n
- | OCamlArg (UInt32 n) ->
+ | UInt32 n ->
pr " uint32_t %s = Int32_val (%sv);\n" n n
- | OCamlArg (UInt64 n) ->
+ | UInt64 n ->
pr " uint64_t %s = Int64_val (%sv);\n" n n
- ) oargs;
+ ) args;
let ret_c_type = C.type_of_ret ret and errcode = C.errcode_of_ret ret in
pr " %s r;\n" ret_c_type;
pr "\n";
pr " caml_enter_blocking_section ();\n";
pr " r = nbd_%s " name;
- C.print_arg_list ~handle:true ~types:false args;
+ C.print_arg_list ~handle:true ~types:false args optargs;
pr ";\n";
pr " caml_leave_blocking_section ();\n";
pr "\n";
@@ -5042,44 +5061,38 @@ let print_ocaml_binding (name, { args; ret }) (* Any
parameters which need to be freed. *)
List.iter (
function
- | OCamlArg (StringList n) -> pr " free (%s);\n" n
- | OCamlHandle
- | OCamlFlags _
- | OCamlArg (Bool _)
- | OCamlArg (BytesIn _)
- | OCamlArg (BytesPersistIn _)
- | OCamlArg (BytesOut _)
- | OCamlArg (BytesPersistOut _)
- | OCamlArg (Closure _)
- | OCamlArg (Flags _)
- | OCamlArg (Int _)
- | OCamlArg (Int64 _)
- | OCamlArg (Path _)
- | OCamlArg (String _)
- | OCamlArg (SockAddrAndLen _)
- | OCamlArg (UInt _)
- | OCamlArg (UInt32 _)
- | OCamlArg (UInt64 _) -> ()
- ) oargs;
+ | StringList n -> pr " free (%s);\n" n
+ | Bool _
+ | BytesIn _
+ | BytesPersistIn _
+ | BytesOut _
+ | BytesPersistOut _
+ | Closure _
+ | Int _
+ | Int64 _
+ | Path _
+ | String _
+ | SockAddrAndLen _
+ | UInt _
+ | UInt32 _
+ | UInt64 _ -> ()
+ ) args;
pr " CAMLreturn (rv);\n";
pr "}\n";
pr "\n";
- if List.length oargs > 5 then (
+ if num_params args optargs > 5 then (
pr "/* Byte-code compat function because this method has > 5
parameters.\n";
pr " */\n";
pr "value\n";
pr "nbd_internal_ocaml_nbd_%s_byte (value *argv, int argn)\n"
name;
pr "{\n";
pr " return nbd_internal_ocaml_nbd_%s (" name;
- let comma = ref false in
- List.iteri (
- fun i _ ->
- if !comma then pr ", ";
- comma := true;
- pr "argv[%d]" i
- ) oargs;
+ for i = 0 to num_params args optargs - 1 do
+ if i > 0 then pr ", ";
+ pr "argv[%d]" i
+ done;
pr ");\n";
pr "}\n";
pr "\n"
--
2.22.0
Eric Blake
2019-Aug-09 13:13 UTC
Re: [Libguestfs] [PATCH libnbd 1/2] generator: Handle closure args (cbargs) specially.
On 8/9/19 7:59 AM, Richard W.M. Jones wrote:> If we accept that callbacks will never handle the full range of > parameters then we can simplify the generator quite a bit by using a > special type for closure args vs normal method args.Nice.> > This removes many asserts and quite a bit of unreachable code > (eg. Python code for handling ArrayAndLen in normal methods that was > never used).Or having a closure arg within a callback.> > The output of the generator after this commit should be identical. > > It's possible to go a little further if we wanted: CBArrayAndLen is > only ever used for ‘uint32_t’ arrays. CBMutable is only ever used for > ‘int*’. We could make CB* types which only handle those cases. > --- > generator/generator | 428 +++++++++++++++++++------------------------- > 1 file changed, 186 insertions(+), 242 deletions(-) >Relatively large, but does look like a simplification.> +and cbarg > +| CBArrayAndLen of arg * string (* array + number of entries *) > +| CBBytesIn of string * string (* like BytesIn *) > +| CBInt of string (* like Int *) > +| CBInt64 of string (* like Int64 *) > +| CBMutable of arg (* mutable argument, eg. int* *)Should we use 'of cbarg' instead of 'of arg' for CBArrayAndLen and CBMutable? Or, as you said above, we could make it a specific type instead of trying to keep a generic wrapper, with the cost that if we add new callbacks down the road we may want to reintroduce the generic wrapper at that time instead of continuing to add one type per use. Looks good to me. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
Eric Blake
2019-Aug-09 13:31 UTC
Re: [Libguestfs] [PATCH libnbd 2/2] generator: Change handling of Flags to be a true optional argument.
On 8/9/19 7:59 AM, Richard W.M. Jones wrote:> In libguestfs generator we have the concept of optargs which is > different from plain arguments. These are mapped to optional > arguments in languages that support them such as Python. > > This commit adds a new concept of optargs. At the moment it is simply > limited to handling the optional (in some bindings) flags parameter > which is used to handle the NBD_CMD_FLAG_* flags. > > If present, the old Flags parameter becomes OFlags and is moved into > the optargs list. > > For the OCaml generation this change simplifies things considerably as > we no longer need the mapping from C arg to ocaml_arg (they are now > the same). > > In the libguestfs C bindings the handling of optargs is rather > complex, and I don't intend to replicate that here. Instead they are > just handled as non-optional arguments appearing after the normal > arguments.C can emulate optional arguments via va_args, but with the drawback that you have to provide some way at the callsite for the implementation to know which varargs to expect; it gets hairy fast. Keeping things as non-optional in libnbd C bindings seems reasonable enough. Another possibility is to generate n different function names (each adding one additional optarg) or even 2^n function names (one for each combination of which optional args are being provided); in that light, our existing nbd_aio_pread vs. nbd_aio_pread_callback could be viewed as two expansions with an optional completion Closure argument, where we generate 2 C bindings, but where other languages could have just a single entry point with an optional Closure argument. But that's obviously ideas for a future patch...> > Note this commit does not change the API in any language. > --- > generator/generator | 505 +++++++++++++++++++++++--------------------- > 1 file changed, 259 insertions(+), 246 deletions(-) >> @@ -3157,17 +3169,14 @@ end = struct > > (* Check the API definition. *) > let () > - (* Flags must only appear once in the final argument position. *) > + (* Currently optargs can only be [] or [OFlags]. This condition > + * will be relaxed later when we support more optional arguments. > + *)...and you even mention that we might have more optional arguments in the future.> List.iter ( > - fun (name, { args }) -> > - let args = List.rev args in > - match args with > - | [] -> () > - | Flags _ :: xs > - | xs -> > - if List.exists (function Flags _ -> true | _ -> false) xs then > - failwithf "%s: Flags must appear in final argument position only" > - name > + function > + | _, { optargs = [] } | _, { optargs = [OFlags _] } -> () > + | (name, _) -> > + failwithf "%s: optargs can only be empty list of [OFlags]" names/of/or/> @@ -3554,7 +3569,7 @@ let permitted_state_text permitted_states > *) > let generate_lib_api_c () > (* Print the wrapper added around all API calls. *) > - let rec print_wrapper (name, {args; ret; permitted_states; > + let rec print_wrapper (name, {args; optargs; ret; permitted_states; > is_locked; may_set_error})Indentation looks odd to me, but that may be because I'm not familiar enough with OCaml indentation conventions. ACK with the typo fix. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
Reasonably Related Threads
- [PATCH libnbd 2/2] generator: Change handling of Flags to be a true optional argument.
- [PATCH libnbd 2/6] generator: Create only one Python wrapper per closure.
- [PATCH libnbd 1/6] generator: Share single list of all Closures.
- [PATCH libnbd 1/3] generator: Change Closure so it describes single callbacks.
- [libnbd PATCH 2/2] RFC: generator: Handle shared callbacks in Python