143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include "param.h"
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#include "type.h"
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#include "value.h"
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#include "expr.h"
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void
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param_init_type(struct param *param, struct arg_type_info *type, int own)
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{
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param->flavor = PARAM_FLAVOR_TYPE;
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param->u.type.type = type;
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param->u.type.own_type = own;
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}
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void
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param_init_stop(struct param *param)
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{
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param->flavor = PARAM_FLAVOR_STOP;
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}
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void
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param_init_pack(struct param *param, enum param_pack_flavor ppflavor,
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struct expr_node *args, size_t nargs, int own_args,
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struct param_enum *(*init)(struct value *cb_args,
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size_t nargs,
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struct value_dict *arguments),
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int (*next)(struct param_enum *context,
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struct arg_type_info *infop,
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int *insert_stop),
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enum param_status (*stop)(struct param_enum *ctx,
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struct value *value),
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void (*done)(struct param_enum *))
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{
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param->flavor = PARAM_FLAVOR_PACK;
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param->u.pack.args = args;
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param->u.pack.nargs = nargs;
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param->u.pack.own_args = own_args;
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param->u.pack.ppflavor = ppflavor;
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param->u.pack.init = init;
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param->u.pack.next = next;
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param->u.pack.stop = stop;
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param->u.pack.done = done;
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}
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struct param_enum *
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param_pack_init(struct param *param, struct value_dict *fargs)
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{
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struct value cb_args[param->u.pack.nargs];
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size_t i;
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/* For evaluation of argument expressions, we pass in this as
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* a "current" value. */
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struct arg_type_info *void_type = type_get_simple(ARGTYPE_VOID);
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struct value void_val;
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value_init_detached(&void_val, NULL, void_type, 0);
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struct param_enum *ret = NULL;
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for (i = 0; i < param->u.pack.nargs; ++i) {
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if (expr_eval(¶m->u.pack.args[i], &void_val,
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fargs, &cb_args[i]) < 0)
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goto release;
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}
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ret = param->u.pack.init(cb_args, param->u.pack.nargs, fargs);
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release:
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while (i-- > 0)
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value_destroy(&cb_args[i]);
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return ret;
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}
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int
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param_pack_next(struct param *param, struct param_enum *context,
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struct arg_type_info *infop, int *insert_stop)
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{
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return param->u.pack.next(context, infop, insert_stop);
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}
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enum param_status
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param_pack_stop(struct param *param,
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struct param_enum *context, struct value *value)
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{
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return param->u.pack.stop(context, value);
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}
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void
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param_pack_done(struct param *param, struct param_enum *context)
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{
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return param->u.pack.done(context);
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}
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void
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param_destroy(struct param *param)
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{
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if (param == NULL)
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return;
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switch (param->flavor) {
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case PARAM_FLAVOR_TYPE:
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if (param->u.type.own_type) {
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type_destroy(param->u.type.type);
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free(param->u.type.type);
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}
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return;
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case PARAM_FLAVOR_PACK:
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if (param->u.pack.own_args) {
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size_t i;
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for (i = 0; i < param->u.pack.nargs; ++i)
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expr_destroy(¶m->u.pack.args[i]);
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free(param->u.pack.args);
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}
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return;
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case PARAM_FLAVOR_STOP:
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return;
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}
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assert(!"Unknown value of param flavor!");
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abort();
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}
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