/*
 * Copyright (C) 2010 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
 */

#include "smatch.h"

static int my_id;

extern int check_assigned_expr_id;

static int is_kmalloc_call(struct expression *expr)
{
        if (expr->type != EXPR_CALL)
                return 0;
        if (expr->fn->type != EXPR_SYMBOL)
                return 0;
        if (!strcmp(expr->fn->symbol_name->name, "kmalloc"))
                return 1;
        if (!strcmp(expr->fn->symbol_name->name, "kzalloc"))
                return 1;
        return 0;
}

static void match_condition(struct expression *expr)
{
        char *macro;
        struct smatch_state *state;
        struct expression *right;
        char *name;

        macro = get_macro_name(expr->pos);
        if (!macro || strcmp(macro, "BUG_ON") != 0)
                return;
        state = get_state_expr(check_assigned_expr_id, expr);
        if (!state || !state->data)
                return;
        right = (struct expression *)state->data;
        if (!is_kmalloc_call(right))
                return;

        name = expr_to_var(expr);
        sm_warning("bug on allocation failure '%s'", name);
        free_string(name);
}

void check_kmalloc_to_bugon(int id)
{
        if (option_project != PROJ_KERNEL)
                return;
        if (!option_spammy)
                return;
        my_id = id;
        add_hook(&match_condition, CONDITION_HOOK);
}