mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
fd9ac7f47d
This implements Pointer arguments properly, at least for certain
limited definitions of "implements" and "properly".
'Pointer' as an argument type is meant to indicate a pointer passed to
an API. The canonical example is the following proposed API:
int guestfs_add_libvirt_dom (guestfs_h *g, virDomainPtr dom, ...);
where 'dom' is described in the generator as:
Pointer ("virDomainPtr", "dom")
Pointer existed already in the generator, but the implementation was
broken. It is not used by any existing API.
There are two basic difficulties of implementing Pointer:
(1) In language bindings there is no portable way to turn (eg.) a Perl
Sys::Virt 'dom' object into a C virDomainPtr.
(2) We can't rely on <libvirt/libvirt.h> being included (since it's an
optional dependency).
In this commit, we solve (2) by using a 'void *'.
We don't solve (1), really. Instead we have a macro
POINTER_NOT_IMPLEMENTED which is used by currently all the non-C
language bindings. It complains loudly and passes a NULL to the
underlying function. The underlying function detects the NULL and
safely returns an error. It is to be hoped that people will
contribute patches to make each language binding work, although in
some bindings it will always remain impossible to implement.
582 lines
18 KiB
OCaml
582 lines
18 KiB
OCaml
(* libguestfs
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* Copyright (C) 2009-2014 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*)
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(* Please read generator/README first. *)
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open Printf
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open Types
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open Utils
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open Pr
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open Docstrings
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open Optgroups
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open Actions
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open Structs
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open C
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let rec generate_php_h () =
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generate_header CStyle LGPLv2plus;
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pr "\
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#ifndef PHP_GUESTFS_PHP_H
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#define PHP_GUESTFS_PHP_H 1
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#ifdef ZTS
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#include \"TSRM.h\"
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#endif
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#define PHP_GUESTFS_PHP_EXTNAME \"guestfs_php\"
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#define PHP_GUESTFS_PHP_VERSION \"1.0\"
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PHP_MINIT_FUNCTION (guestfs_php);
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#define PHP_GUESTFS_HANDLE_RES_NAME \"guestfs_h\"
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PHP_FUNCTION (guestfs_create);
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PHP_FUNCTION (guestfs_last_error);
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";
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List.iter (
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fun { name = name } -> pr "PHP_FUNCTION (guestfs_%s);\n" name
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) external_functions_sorted;
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pr "\
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extern zend_module_entry guestfs_php_module_entry;
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#define phpext_guestfs_php_ptr &guestfs_php_module_entry
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#endif /* PHP_GUESTFS_PHP_H */
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"
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and generate_php_c () =
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generate_header CStyle LGPLv2plus;
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pr "\
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/* NOTE: Be very careful with all macros in PHP header files. The
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* morons who wrote them aren't good at making them safe for inclusion
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* in arbitrary places in C code, eg. not using 'do ... while(0)'
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* or parenthesizing any of the arguments.
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*/
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/* NOTE (2): Some parts of the API can't be used on 32 bit platforms.
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* Any 64 bit numbers will be truncated. There's no easy way around
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* this in PHP.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <php.h>
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#include <php_guestfs_php.h>
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#include \"guestfs.h\"
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#include \"guestfs-internal-frontend.h\"
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static int res_guestfs_h;
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static void
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guestfs_php_handle_dtor (zend_rsrc_list_entry *rsrc TSRMLS_DC)
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{
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guestfs_h *g = (guestfs_h *) rsrc->ptr;
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if (g != NULL)
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guestfs_close (g);
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}
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PHP_MINIT_FUNCTION (guestfs_php)
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{
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res_guestfs_h =
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zend_register_list_destructors_ex (guestfs_php_handle_dtor,
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NULL, PHP_GUESTFS_HANDLE_RES_NAME, module_number);
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return SUCCESS;
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}
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static zend_function_entry guestfs_php_functions[] = {
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PHP_FE (guestfs_create, NULL)
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PHP_FE (guestfs_last_error, NULL)
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";
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List.iter (
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fun { name = name } -> pr " PHP_FE (guestfs_%s, NULL)\n" name
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) external_functions_sorted;
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pr " { NULL, NULL, NULL }
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};
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zend_module_entry guestfs_php_module_entry = {
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#if ZEND_MODULE_API_NO >= 20010901
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STANDARD_MODULE_HEADER,
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#endif
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PHP_GUESTFS_PHP_EXTNAME,
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guestfs_php_functions,
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PHP_MINIT (guestfs_php),
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NULL,
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NULL,
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NULL,
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NULL,
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#if ZEND_MODULE_API_NO >= 20010901
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PHP_GUESTFS_PHP_VERSION,
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#endif
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STANDARD_MODULE_PROPERTIES
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};
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#ifdef COMPILE_DL_GUESTFS_PHP
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ZEND_GET_MODULE (guestfs_php)
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#endif
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PHP_FUNCTION (guestfs_create)
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{
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guestfs_h *g = guestfs_create ();
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if (g == NULL) {
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RETURN_FALSE;
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}
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guestfs_set_error_handler (g, NULL, NULL);
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ZEND_REGISTER_RESOURCE (return_value, g, res_guestfs_h);
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}
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PHP_FUNCTION (guestfs_last_error)
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{
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zval *z_g;
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guestfs_h *g;
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if (zend_parse_parameters (ZEND_NUM_ARGS() TSRMLS_CC, \"r\",
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&z_g) == FAILURE) {
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RETURN_FALSE;
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}
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ZEND_FETCH_RESOURCE (g, guestfs_h *, &z_g, -1, PHP_GUESTFS_HANDLE_RES_NAME,
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res_guestfs_h);
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if (g == NULL) {
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RETURN_FALSE;
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}
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const char *err = guestfs_last_error (g);
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if (err) {
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RETURN_STRING (err, 1);
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} else {
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RETURN_NULL ();
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}
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}
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";
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(* Now generate the PHP bindings for each action. *)
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List.iter (
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fun { name = shortname; style = ret, args, optargs as style;
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c_function = c_function; c_optarg_prefix = c_optarg_prefix } ->
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pr "PHP_FUNCTION (guestfs_%s)\n" shortname;
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pr "{\n";
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pr " zval *z_g;\n";
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pr " guestfs_h *g;\n";
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List.iter (
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function
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| String n | Device n | Mountable n | Pathname n
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| Dev_or_Path n | Mountable_or_Path n
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| FileIn n | FileOut n | Key n
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| OptString n
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| BufferIn n
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| GUID n ->
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pr " char *%s;\n" n;
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pr " int %s_size;\n" n
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| StringList n
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| DeviceList n ->
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pr " zval *z_%s;\n" n;
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pr " char **%s;\n" n;
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| Bool n ->
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pr " zend_bool %s;\n" n
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| Int n | Int64 n ->
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pr " long %s;\n" n
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| Pointer (t, n) ->
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pr " void * /* %s */ %s;\n" t n
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) args;
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if optargs <> [] then (
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pr " struct %s optargs_s = { .bitmask = 0 };\n" c_function;
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pr " struct %s *optargs = &optargs_s;\n" c_function;
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(* XXX Ugh PHP doesn't have proper optional arguments, so we
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* have to use sentinel values.
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*)
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(* Since we don't know if PHP types will exactly match structure
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* types, declare some local variables here.
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*)
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List.iter (
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function
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| OBool n -> pr " zend_bool optargs_t_%s = -1;\n" n
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| OInt n | OInt64 n -> pr " long optargs_t_%s = -1;\n" n
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| OString n ->
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pr " char *optargs_t_%s = NULL;\n" n;
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pr " int optargs_t_%s_size = -1;\n" n
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| OStringList n ->
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pr " zval *optargs_t_%s = NULL;\n" n
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) optargs
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);
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pr "\n";
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(* Parse the parameters. *)
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let param_string = String.concat "" (
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List.map (
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function
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| String n | Device n | Mountable n | Pathname n
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| Dev_or_Path n | Mountable_or_Path n
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| FileIn n | FileOut n | BufferIn n | Key n
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| GUID n -> "s"
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| OptString n -> "s!"
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| StringList n | DeviceList n -> "a"
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| Bool n -> "b"
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| Int n | Int64 n -> "l"
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| Pointer _ -> ""
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) args
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) in
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let param_string =
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if optargs <> [] then
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param_string ^ "|" ^
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String.concat "" (
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List.map (
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function
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| OBool _ -> "b"
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| OInt _ | OInt64 _ -> "l"
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| OString _ -> "s"
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| OStringList _ ->
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(* Because this is an optarg, it can be passed as
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* NULL, so we must add '!' afterwards.
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*)
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"a!"
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) optargs
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)
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else param_string in
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pr " if (zend_parse_parameters (ZEND_NUM_ARGS() TSRMLS_CC, \"r%s\",\n"
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param_string;
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pr " &z_g";
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List.iter (
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function
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| String n | Device n | Mountable n | Pathname n
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| Dev_or_Path n | Mountable_or_Path n
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| FileIn n | FileOut n | BufferIn n | Key n
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| OptString n | GUID n ->
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pr ", &%s, &%s_size" n n
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| StringList n | DeviceList n ->
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pr ", &z_%s" n
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| Bool n ->
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pr ", &%s" n
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| Int n | Int64 n ->
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pr ", &%s" n
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| Pointer (_, n) -> ()
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) args;
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List.iter (
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function
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| OBool n | OInt n | OInt64 n ->
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pr ", &optargs_t_%s" n
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| OString n ->
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pr ", &optargs_t_%s, &optargs_t_%s_size" n n
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| OStringList n ->
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pr ", &optargs_t_%s" n
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) optargs;
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pr ") == FAILURE) {\n";
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pr " RETURN_FALSE;\n";
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pr " }\n";
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pr "\n";
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pr " ZEND_FETCH_RESOURCE (g, guestfs_h *, &z_g, -1, PHP_GUESTFS_HANDLE_RES_NAME,\n";
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pr " res_guestfs_h);\n";
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pr " if (g == NULL) {\n";
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pr " RETURN_FALSE;\n";
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pr " }\n";
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pr "\n";
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List.iter (
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function
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| String n | Device n | Mountable n | Pathname n
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| Dev_or_Path n | Mountable_or_Path n
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| FileIn n | FileOut n | Key n
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| OptString n | GUID n ->
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(* Just need to check the string doesn't contain any ASCII
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* NUL characters, which won't be supported by the C API.
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*)
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pr " if (strlen (%s) != %s_size) {\n" n n;
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pr " fprintf (stderr, \"libguestfs: %s: parameter '%s' contains embedded ASCII NUL.\\n\");\n" shortname n;
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pr " RETURN_FALSE;\n";
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pr " }\n";
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pr "\n"
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| BufferIn n -> ()
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| StringList n
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| DeviceList n ->
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(* Convert array to list of strings.
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* http://marc.info/?l=pecl-dev&m=112205192100631&w=2
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*)
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pr " {\n";
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pr " HashTable *a;\n";
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pr " int n;\n";
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pr " HashPosition p;\n";
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pr " zval **d;\n";
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pr " size_t c = 0;\n";
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pr "\n";
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pr " a = Z_ARRVAL_P (z_%s);\n" n;
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pr " n = zend_hash_num_elements (a);\n";
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pr " %s = safe_emalloc (n + 1, sizeof (char *), 0);\n" n;
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pr " for (zend_hash_internal_pointer_reset_ex (a, &p);\n";
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pr " zend_hash_get_current_data_ex (a, (void **) &d, &p) == SUCCESS;\n";
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pr " zend_hash_move_forward_ex (a, &p)) {\n";
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pr " zval t = **d;\n";
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pr " zval_copy_ctor (&t);\n";
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pr " convert_to_string (&t);\n";
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pr " %s[c] = Z_STRVAL (t);\n" n;
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pr " c++;\n";
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pr " }\n";
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pr " %s[c] = NULL;\n" n;
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pr " }\n";
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pr "\n"
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| Bool _ | Int _ | Int64 _ -> ()
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| Pointer (t, n) ->
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pr " %s = POINTER_NOT_IMPLEMENTED (\"%s\");\n" n t
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) args;
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(* Optional arguments. *)
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if optargs <> [] then (
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List.iter (
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function
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| OBool n ->
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let uc_n = String.uppercase n in
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pr " if (optargs_t_%s != (zend_bool)-1) {\n" n;
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pr " optargs_s.%s = optargs_t_%s;\n" n n;
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pr " optargs_s.bitmask |= %s_%s_BITMASK;\n" c_optarg_prefix uc_n;
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pr " }\n"
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| OInt n | OInt64 n ->
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let uc_n = String.uppercase n in
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pr " if (optargs_t_%s != -1) {\n" n;
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pr " optargs_s.%s = optargs_t_%s;\n" n n;
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pr " optargs_s.bitmask |= %s_%s_BITMASK;\n" c_optarg_prefix uc_n;
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pr " }\n"
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| OString n ->
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let uc_n = String.uppercase n in
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pr " if (optargs_t_%s != NULL) {\n" n;
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pr " optargs_s.%s = optargs_t_%s;\n" n n;
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pr " optargs_s.bitmask |= %s_%s_BITMASK;\n" c_optarg_prefix uc_n;
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pr " }\n"
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| OStringList n ->
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let uc_n = String.uppercase n in
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pr " /* We've seen PHP give us a *long* here when we asked for an array, so\n";
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pr " * positively check that it gave us an array, otherwise ignore it.\n";
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pr " */\n";
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pr " if (optargs_t_%s != NULL && Z_TYPE_P (optargs_t_%s) == IS_ARRAY) {\n" n n;
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pr " char **r;\n";
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pr " HashTable *a;\n";
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pr " int n;\n";
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pr " HashPosition p;\n";
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pr " zval **d;\n";
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pr " size_t c = 0;\n";
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pr "\n";
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pr " a = Z_ARRVAL_P (optargs_t_%s);\n" n;
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pr " n = zend_hash_num_elements (a);\n";
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pr " r = safe_emalloc (n + 1, sizeof (char *), 0);\n";
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pr " for (zend_hash_internal_pointer_reset_ex (a, &p);\n";
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pr " zend_hash_get_current_data_ex (a, (void **) &d, &p) == SUCCESS;\n";
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pr " zend_hash_move_forward_ex (a, &p)) {\n";
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pr " zval t = **d;\n";
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pr " zval_copy_ctor (&t);\n";
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pr " convert_to_string (&t);\n";
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pr " r[c] = Z_STRVAL (t);\n";
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pr " c++;\n";
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pr " }\n";
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pr " r[c] = NULL;\n";
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pr "\n";
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pr " optargs_s.%s = r;\n" n;
|
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pr " optargs_s.bitmask |= %s_%s_BITMASK;\n" c_optarg_prefix uc_n;
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pr " }\n";
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) optargs;
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pr "\n"
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);
|
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|
|
(* Return value. *)
|
|
(match ret with
|
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| RErr -> pr " int r;\n"
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| RBool _
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| RInt _ -> pr " int r;\n"
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| RInt64 _ -> pr " int64_t r;\n"
|
|
| RConstString _ -> pr " const char *r;\n"
|
|
| RConstOptString _ -> pr " const char *r;\n"
|
|
| RString _ ->
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|
pr " char *r;\n"
|
|
| RStringList _ ->
|
|
pr " char **r;\n"
|
|
| RStruct (_, typ) ->
|
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pr " struct guestfs_%s *r;\n" typ
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|
| 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"
|
|
);
|
|
|
|
(* Call the function. *)
|
|
pr " r = %s " c_function;
|
|
generate_c_call_args ~handle:"g" style;
|
|
pr ";\n";
|
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pr "\n";
|
|
|
|
(* Free up parameters. *)
|
|
List.iter (
|
|
function
|
|
| String n | Device n | Mountable n | Pathname n
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| Dev_or_Path n | Mountable_or_Path n
|
|
| FileIn n | FileOut n | Key n
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|
| OptString n | GUID n -> ()
|
|
| BufferIn n -> ()
|
|
| StringList n
|
|
| DeviceList n ->
|
|
pr " {\n";
|
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pr " size_t c = 0;\n";
|
|
pr "\n";
|
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pr " for (c = 0; %s[c] != NULL; ++c)\n" n;
|
|
pr " efree (%s[c]);\n" n;
|
|
pr " efree (%s);\n" n;
|
|
pr " }\n";
|
|
pr "\n"
|
|
| Bool _ | Int _ | Int64 _ | Pointer _ -> ()
|
|
) args;
|
|
|
|
(* Check for errors. *)
|
|
(match errcode_of_ret ret with
|
|
| `CannotReturnError -> ()
|
|
| `ErrorIsMinusOne ->
|
|
pr " if (r == -1) {\n";
|
|
pr " RETURN_FALSE;\n";
|
|
pr " }\n"
|
|
| `ErrorIsNULL ->
|
|
pr " if (r == NULL) {\n";
|
|
pr " RETURN_FALSE;\n";
|
|
pr " }\n"
|
|
);
|
|
pr "\n";
|
|
|
|
(* Convert the return value. *)
|
|
(match ret with
|
|
| RErr ->
|
|
pr " RETURN_TRUE;\n"
|
|
| RBool _ ->
|
|
pr " RETURN_BOOL (r);\n"
|
|
| RInt _ ->
|
|
pr " RETURN_LONG (r);\n"
|
|
| RInt64 _ ->
|
|
pr " RETURN_LONG (r);\n"
|
|
| RConstString _ ->
|
|
pr " RETURN_STRING (r, 1);\n"
|
|
| RConstOptString _ ->
|
|
pr " if (r) { RETURN_STRING (r, 1); }\n";
|
|
pr " else { RETURN_NULL (); }\n"
|
|
| RString _ ->
|
|
pr " char *r_copy = estrdup (r);\n";
|
|
pr " free (r);\n";
|
|
pr " RETURN_STRING (r_copy, 0);\n"
|
|
| RBufferOut _ ->
|
|
pr " char *r_copy = estrndup (r, size);\n";
|
|
pr " free (r);\n";
|
|
pr " RETURN_STRING (r_copy, 0);\n"
|
|
| RStringList _ ->
|
|
pr " size_t c = 0;\n";
|
|
pr " array_init (return_value);\n";
|
|
pr " for (c = 0; r[c] != NULL; ++c) {\n";
|
|
pr " add_next_index_string (return_value, r[c], 1);\n";
|
|
pr " free (r[c]);\n";
|
|
pr " }\n";
|
|
pr " free (r);\n";
|
|
| RHashtable _ ->
|
|
pr " size_t c = 0;\n";
|
|
pr " array_init (return_value);\n";
|
|
pr " for (c = 0; r[c] != NULL; c += 2) {\n";
|
|
pr " add_assoc_string (return_value, r[c], r[c+1], 1);\n";
|
|
pr " free (r[c]);\n";
|
|
pr " free (r[c+1]);\n";
|
|
pr " }\n";
|
|
pr " free (r);\n";
|
|
| RStruct (_, typ) ->
|
|
let cols = cols_of_struct typ in
|
|
generate_php_struct_code typ cols
|
|
| RStructList (_, typ) ->
|
|
let cols = cols_of_struct typ in
|
|
generate_php_struct_list_code typ cols
|
|
);
|
|
|
|
pr "}\n";
|
|
pr "\n"
|
|
) external_functions_sorted
|
|
|
|
and generate_php_struct_code typ cols =
|
|
pr " array_init (return_value);\n";
|
|
List.iter (
|
|
function
|
|
| name, FString ->
|
|
pr " add_assoc_string (return_value, \"%s\", r->%s, 1);\n" name name
|
|
| name, FBuffer ->
|
|
pr " add_assoc_stringl (return_value, \"%s\", r->%s, r->%s_len, 1);\n"
|
|
name name name
|
|
| name, FUUID ->
|
|
pr " add_assoc_stringl (return_value, \"%s\", r->%s, 32, 1);\n"
|
|
name name
|
|
| name, (FBytes|FUInt64|FInt64|FInt32|FUInt32) ->
|
|
pr " add_assoc_long (return_value, \"%s\", r->%s);\n"
|
|
name name
|
|
| name, FChar ->
|
|
pr " add_assoc_stringl (return_value, \"%s\", &r->%s, 1, 1);\n"
|
|
name name
|
|
| name, FOptPercent ->
|
|
pr " add_assoc_double (return_value, \"%s\", r->%s);\n"
|
|
name name
|
|
) cols;
|
|
pr " guestfs_free_%s (r);\n" typ
|
|
|
|
and generate_php_struct_list_code typ cols =
|
|
pr " array_init (return_value);\n";
|
|
pr " size_t c = 0;\n";
|
|
pr " for (c = 0; c < r->len; ++c) {\n";
|
|
pr " zval *z_elem;\n";
|
|
pr " ALLOC_INIT_ZVAL (z_elem);\n";
|
|
pr " array_init (z_elem);\n";
|
|
List.iter (
|
|
function
|
|
| name, FString ->
|
|
pr " add_assoc_string (z_elem, \"%s\", r->val[c].%s, 1);\n"
|
|
name name
|
|
| name, FBuffer ->
|
|
pr " add_assoc_stringl (z_elem, \"%s\", r->val[c].%s, r->val[c].%s_len, 1);\n"
|
|
name name name
|
|
| name, FUUID ->
|
|
pr " add_assoc_stringl (z_elem, \"%s\", r->val[c].%s, 32, 1);\n"
|
|
name name
|
|
| name, (FBytes|FUInt64|FInt64|FInt32|FUInt32) ->
|
|
pr " add_assoc_long (z_elem, \"%s\", r->val[c].%s);\n"
|
|
name name
|
|
| name, FChar ->
|
|
pr " add_assoc_stringl (z_elem, \"%s\", &r->val[c].%s, 1, 1);\n"
|
|
name name
|
|
| name, FOptPercent ->
|
|
pr " add_assoc_double (z_elem, \"%s\", r->val[c].%s);\n"
|
|
name name
|
|
) cols;
|
|
pr " add_next_index_zval (return_value, z_elem);\n";
|
|
pr " }\n";
|
|
pr " guestfs_free_%s_list (r);\n" typ
|