/* GObject introspection: Invoke functionality * * Copyright (C) 2005 Matthias Clasen * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include #include "girepository.h" #include "girffi.h" #include "gtypelib.h" #include "config.h" GQuark g_invoke_error_quark (void) { static GQuark quark = 0; if (quark == 0) quark = g_quark_from_static_string ("g-invoke-error-quark"); return quark; } #include "ffi.h" static ffi_type * get_ffi_type (GITypeInfo *info) { if (g_type_info_is_pointer (info)) return &ffi_type_pointer; else return g_ir_ffi_get_ffi_type (g_type_info_get_tag (info)); } /** * g_function_info_invoke: * @info: a #GIFunctionInfo describing the function to invoke * @in_args: an array of #GArguments, one for each in * parameter of @info. If there are no in parameter, @in_args * can be %NULL * @n_in_args: the length of the @in_args array * @out_args: an array of #GArguments, one for each out * parameter of @info. If there are no out parameters, @out_args * may be %NULL * @n_out_args: the length of the @out_args array * @return_value: return location for the return value of the * function. If the function returns void, @return_value may be * %NULL * @error: return location for detailed error information, or %NULL * * Invokes the function described in @info with the given * arguments. Note that inout parameters must appear in both * argument lists. This function uses dlsym() to obtain a pointer * to the function, so the library or shared object containing the * described function must either be linked to the caller, or must * have been dlopen()ed before calling this function. * * Returns: %TRUE if the function has been invoked, %FALSE if an * error occurred. */ gboolean g_function_info_invoke (GIFunctionInfo *info, const GArgument *in_args, int n_in_args, const GArgument *out_args, int n_out_args, GArgument *return_value, GError **error) { ffi_cif cif; ffi_type *rtype; ffi_type **atypes; const gchar *symbol; gpointer func; GITypeInfo *tinfo; GIArgInfo *ainfo; gboolean is_method; gboolean throws; gint n_args, n_invoke_args, in_pos, out_pos, i; gpointer *args; gboolean success = FALSE; GError *local_error = NULL; gpointer error_address = &local_error; symbol = g_function_info_get_symbol (info); if (!g_typelib_symbol (g_base_info_get_typelib((GIBaseInfo *) info), symbol, &func)) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_SYMBOL_NOT_FOUND, "Could not locate %s: %s", symbol, g_module_error ()); return FALSE; } is_method = (g_function_info_get_flags (info) & GI_FUNCTION_IS_METHOD) != 0 && (g_function_info_get_flags (info) & GI_FUNCTION_IS_CONSTRUCTOR) == 0; throws = g_function_info_get_flags (info) & GI_FUNCTION_THROWS; tinfo = g_callable_info_get_return_type ((GICallableInfo *)info); rtype = get_ffi_type (tinfo); g_base_info_unref ((GIBaseInfo *)tinfo); in_pos = 0; out_pos = 0; n_args = g_callable_info_get_n_args ((GICallableInfo *)info); if (is_method) { if (n_in_args == 0) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too few \"in\" arguments (handling this)"); goto out; } n_invoke_args = n_args+1; in_pos++; } else n_invoke_args = n_args; if (throws) /* Add an argument for the GError */ n_invoke_args ++; atypes = g_alloca (sizeof (ffi_type*) * n_invoke_args); args = g_alloca (sizeof (gpointer) * n_invoke_args); if (is_method) { atypes[0] = &ffi_type_pointer; args[0] = (gpointer) &in_args[0]; } for (i = 0; i < n_args; i++) { int offset = (is_method ? 1 : 0); ainfo = g_callable_info_get_arg ((GICallableInfo *)info, i); switch (g_arg_info_get_direction (ainfo)) { case GI_DIRECTION_IN: tinfo = g_arg_info_get_type (ainfo); atypes[i+offset] = get_ffi_type (tinfo); g_base_info_unref ((GIBaseInfo *)tinfo); if (in_pos >= n_in_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too few \"in\" arguments (handling in)"); goto out; } args[i+offset] = (gpointer)&in_args[in_pos]; in_pos++; break; case GI_DIRECTION_OUT: atypes[i+offset] = &ffi_type_pointer; if (out_pos >= n_out_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too few \"out\" arguments (handling out)"); goto out; } args[i+offset] = (gpointer)&out_args[out_pos]; out_pos++; break; case GI_DIRECTION_INOUT: atypes[i+offset] = &ffi_type_pointer; if (in_pos >= n_in_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too few \"in\" arguments (handling inout)"); goto out; } if (out_pos >= n_out_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too few \"out\" arguments (handling inout)"); goto out; } args[i+offset] = (gpointer)&in_args[in_pos]; in_pos++; out_pos++; break; default: g_assert_not_reached (); } g_base_info_unref ((GIBaseInfo *)ainfo); } if (throws) { args[n_invoke_args - 1] = &error_address; atypes[n_invoke_args - 1] = &ffi_type_pointer; } if (in_pos < n_in_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too many \"in\" arguments (at end)"); goto out; } if (out_pos < n_out_args) { g_set_error (error, G_INVOKE_ERROR, G_INVOKE_ERROR_ARGUMENT_MISMATCH, "Too many \"out\" arguments (at end)"); goto out; } if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, n_invoke_args, rtype, atypes) != FFI_OK) goto out; ffi_call (&cif, func, return_value, args); if (local_error) { g_propagate_error (error, local_error); success = FALSE; } else { success = TRUE; } out: return success; }