1*1f5207b7SJohn Levon /* 2*1f5207b7SJohn Levon * Copyright (C) 2010 Dan Carpenter. 3*1f5207b7SJohn Levon * 4*1f5207b7SJohn Levon * This program is free software; you can redistribute it and/or 5*1f5207b7SJohn Levon * modify it under the terms of the GNU General Public License 6*1f5207b7SJohn Levon * as published by the Free Software Foundation; either version 2 7*1f5207b7SJohn Levon * of the License, or (at your option) any later version. 8*1f5207b7SJohn Levon * 9*1f5207b7SJohn Levon * This program is distributed in the hope that it will be useful, 10*1f5207b7SJohn Levon * but WITHOUT ANY WARRANTY; without even the implied warranty of 11*1f5207b7SJohn Levon * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12*1f5207b7SJohn Levon * GNU General Public License for more details. 13*1f5207b7SJohn Levon * 14*1f5207b7SJohn Levon * You should have received a copy of the GNU General Public License 15*1f5207b7SJohn Levon * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt 16*1f5207b7SJohn Levon */ 17*1f5207b7SJohn Levon 18*1f5207b7SJohn Levon #include "smatch.h" 19*1f5207b7SJohn Levon 20*1f5207b7SJohn Levon static int my_id; 21*1f5207b7SJohn Levon static struct symbol *func_sym; 22*1f5207b7SJohn Levon 23*1f5207b7SJohn Levon STATE(argument); 24*1f5207b7SJohn Levon STATE(ok); 25*1f5207b7SJohn Levon 26*1f5207b7SJohn Levon static void set_ok(struct sm_state *sm, struct expression *mod_expr) 27*1f5207b7SJohn Levon { 28*1f5207b7SJohn Levon if (sm->state != &ok) 29*1f5207b7SJohn Levon set_state(my_id, sm->name, sm->sym, &ok); 30*1f5207b7SJohn Levon } 31*1f5207b7SJohn Levon 32*1f5207b7SJohn Levon static void match_function_def(struct symbol *sym) 33*1f5207b7SJohn Levon { 34*1f5207b7SJohn Levon struct symbol *arg; 35*1f5207b7SJohn Levon 36*1f5207b7SJohn Levon func_sym = sym; 37*1f5207b7SJohn Levon FOR_EACH_PTR(func_sym->ctype.base_type->arguments, arg) { 38*1f5207b7SJohn Levon if (!arg->ident) { 39*1f5207b7SJohn Levon continue; 40*1f5207b7SJohn Levon } 41*1f5207b7SJohn Levon set_state(my_id, arg->ident->name, arg, &argument); 42*1f5207b7SJohn Levon } END_FOR_EACH_PTR(arg); 43*1f5207b7SJohn Levon } 44*1f5207b7SJohn Levon 45*1f5207b7SJohn Levon static int get_arg_num(struct expression *expr) 46*1f5207b7SJohn Levon { 47*1f5207b7SJohn Levon struct smatch_state *state; 48*1f5207b7SJohn Levon struct symbol *arg; 49*1f5207b7SJohn Levon struct symbol *this_arg; 50*1f5207b7SJohn Levon int i; 51*1f5207b7SJohn Levon 52*1f5207b7SJohn Levon expr = strip_expr(expr); 53*1f5207b7SJohn Levon if (expr->type != EXPR_SYMBOL) 54*1f5207b7SJohn Levon return -1; 55*1f5207b7SJohn Levon this_arg = expr->symbol; 56*1f5207b7SJohn Levon 57*1f5207b7SJohn Levon state = get_state_expr(my_id, expr); 58*1f5207b7SJohn Levon if (!state || state != &argument) 59*1f5207b7SJohn Levon return -1; 60*1f5207b7SJohn Levon 61*1f5207b7SJohn Levon i = 0; 62*1f5207b7SJohn Levon FOR_EACH_PTR(func_sym->ctype.base_type->arguments, arg) { 63*1f5207b7SJohn Levon if (arg == this_arg) 64*1f5207b7SJohn Levon return i; 65*1f5207b7SJohn Levon i++; 66*1f5207b7SJohn Levon } END_FOR_EACH_PTR(arg); 67*1f5207b7SJohn Levon 68*1f5207b7SJohn Levon return -1; 69*1f5207b7SJohn Levon } 70*1f5207b7SJohn Levon 71*1f5207b7SJohn Levon static void match_is_err(const char *fn, struct expression *expr, void *unused) 72*1f5207b7SJohn Levon { 73*1f5207b7SJohn Levon struct expression *arg; 74*1f5207b7SJohn Levon int arg_num; 75*1f5207b7SJohn Levon 76*1f5207b7SJohn Levon arg = get_argument_from_call_expr(expr->args, 0); 77*1f5207b7SJohn Levon arg_num = get_arg_num(arg); 78*1f5207b7SJohn Levon if (arg_num < 0) 79*1f5207b7SJohn Levon return; 80*1f5207b7SJohn Levon sm_msg("info: expects ERR_PTR %d", arg_num); 81*1f5207b7SJohn Levon } 82*1f5207b7SJohn Levon 83*1f5207b7SJohn Levon void check_expects_err_ptr(int id) 84*1f5207b7SJohn Levon { 85*1f5207b7SJohn Levon if (option_project != PROJ_KERNEL) 86*1f5207b7SJohn Levon return; 87*1f5207b7SJohn Levon if (!option_info) 88*1f5207b7SJohn Levon return; 89*1f5207b7SJohn Levon 90*1f5207b7SJohn Levon my_id = id; 91*1f5207b7SJohn Levon add_hook(&match_function_def, FUNC_DEF_HOOK); 92*1f5207b7SJohn Levon add_modification_hook(my_id, &set_ok); 93*1f5207b7SJohn Levon add_function_hook("IS_ERR", &match_is_err, NULL); 94*1f5207b7SJohn Levon } 95