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check_param_mapper.c
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check_param_mapper.c
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/*
* Copyright (C) 2009 Dan Carpenter.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
*/
/*
* The idea behind this test is that if we have:
* void foo(int bar)
* {
* baz(1, bar);
* }
*
* Passing "bar" to foo() really means passing "bar" to baz();
*
* In this case it would print:
* info: param_mapper 0 => bar 1
*
*/
#include "smatch.h"
static int my_id;
STATE(argument);
static struct symbol *func_sym;
static void delete(struct sm_state *sm, struct expression *mod_expr)
{
set_state(my_id, sm->name, sm->sym, &undefined);
}
static void match_function_def(struct symbol *sym)
{
struct symbol *arg;
func_sym = sym;
FOR_EACH_PTR(func_sym->ctype.base_type->arguments, arg) {
if (!arg->ident) {
continue;
}
set_state(my_id, arg->ident->name, arg, &argument);
} END_FOR_EACH_PTR(arg);
}
static int get_arg_num(struct expression *expr)
{
struct smatch_state *state;
struct symbol *arg;
struct symbol *this_arg;
int i;
expr = strip_expr(expr);
if (expr->type != EXPR_SYMBOL)
return -1;
this_arg = expr->symbol;
state = get_state_expr(my_id, expr);
if (!state || state != &argument)
return -1;
i = 0;
FOR_EACH_PTR(func_sym->ctype.base_type->arguments, arg) {
if (arg == this_arg)
return i;
i++;
} END_FOR_EACH_PTR(arg);
return -1;
}
static void match_call(struct expression *expr)
{
struct expression *tmp;
char *func;
int arg_num;
int i;
if (expr->fn->type != EXPR_SYMBOL)
return;
func = expr->fn->symbol_name->name;
i = 0;
FOR_EACH_PTR(expr->args, tmp) {
tmp = strip_expr(tmp);
arg_num = get_arg_num(tmp);
if (arg_num >= 0)
sm_msg("info: param_mapper %d => %s %d", arg_num, func, i);
i++;
} END_FOR_EACH_PTR(tmp);
}
void check_param_mapper(int id)
{
if (!option_param_mapper)
return;
my_id = id;
add_modification_hook(my_id, &delete);
add_hook(&match_function_def, FUNC_DEF_HOOK);
add_hook(&match_call, FUNCTION_CALL_HOOK);
}