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 /*
19*1f5207b7SJohn Levon * I found a bug where someone released the wrong resource and wanted to
20*1f5207b7SJohn Levon * prevent that from happening again.
21*1f5207b7SJohn Levon *
22*1f5207b7SJohn Levon */
23*1f5207b7SJohn Levon
24*1f5207b7SJohn Levon #include "smatch.h"
25*1f5207b7SJohn Levon
26*1f5207b7SJohn Levon static int my_id;
27*1f5207b7SJohn Levon
28*1f5207b7SJohn Levon static struct tracker_list *resource_list;
29*1f5207b7SJohn Levon
match_request(const char * fn,struct expression * expr,void * _arg_no)30*1f5207b7SJohn Levon static void match_request(const char *fn, struct expression *expr, void *_arg_no)
31*1f5207b7SJohn Levon {
32*1f5207b7SJohn Levon struct expression *arg_expr;
33*1f5207b7SJohn Levon int arg_no = PTR_INT(_arg_no);
34*1f5207b7SJohn Levon char *name;
35*1f5207b7SJohn Levon struct symbol *sym;
36*1f5207b7SJohn Levon
37*1f5207b7SJohn Levon arg_expr = get_argument_from_call_expr(expr->args, arg_no);
38*1f5207b7SJohn Levon arg_expr = strip_expr(arg_expr);
39*1f5207b7SJohn Levon
40*1f5207b7SJohn Levon name = expr_to_var_sym(arg_expr, &sym);
41*1f5207b7SJohn Levon if (!name || !sym)
42*1f5207b7SJohn Levon goto free;
43*1f5207b7SJohn Levon add_tracker(&resource_list, my_id, name, sym);
44*1f5207b7SJohn Levon free:
45*1f5207b7SJohn Levon free_string(name);
46*1f5207b7SJohn Levon }
47*1f5207b7SJohn Levon
match_release(const char * fn,struct expression * expr,void * _arg_no)48*1f5207b7SJohn Levon static void match_release(const char *fn, struct expression *expr, void *_arg_no)
49*1f5207b7SJohn Levon {
50*1f5207b7SJohn Levon struct expression *arg_expr;
51*1f5207b7SJohn Levon int arg_no = PTR_INT(_arg_no);
52*1f5207b7SJohn Levon char *name;
53*1f5207b7SJohn Levon struct symbol *sym;
54*1f5207b7SJohn Levon
55*1f5207b7SJohn Levon arg_expr = get_argument_from_call_expr(expr->args, arg_no);
56*1f5207b7SJohn Levon arg_expr = strip_expr(arg_expr);
57*1f5207b7SJohn Levon
58*1f5207b7SJohn Levon if (!resource_list)
59*1f5207b7SJohn Levon return;
60*1f5207b7SJohn Levon
61*1f5207b7SJohn Levon name = expr_to_var_sym(arg_expr, &sym);
62*1f5207b7SJohn Levon if (!name || !sym)
63*1f5207b7SJohn Levon goto free;
64*1f5207b7SJohn Levon if (in_tracker_list(resource_list, my_id, name, sym))
65*1f5207b7SJohn Levon goto free;
66*1f5207b7SJohn Levon sm_warning("'%s' was not one of the resources you requested", name);
67*1f5207b7SJohn Levon free:
68*1f5207b7SJohn Levon free_string(name);
69*1f5207b7SJohn Levon }
70*1f5207b7SJohn Levon
match_end_func(struct symbol * sym)71*1f5207b7SJohn Levon static void match_end_func(struct symbol *sym)
72*1f5207b7SJohn Levon {
73*1f5207b7SJohn Levon if (__inline_fn)
74*1f5207b7SJohn Levon return;
75*1f5207b7SJohn Levon free_trackers_and_list(&resource_list);
76*1f5207b7SJohn Levon }
77*1f5207b7SJohn Levon
check_release_resource(int id)78*1f5207b7SJohn Levon void check_release_resource(int id)
79*1f5207b7SJohn Levon {
80*1f5207b7SJohn Levon my_id = id;
81*1f5207b7SJohn Levon
82*1f5207b7SJohn Levon if (option_project != PROJ_KERNEL)
83*1f5207b7SJohn Levon return;
84*1f5207b7SJohn Levon
85*1f5207b7SJohn Levon add_function_hook("request_resource", &match_request, (void *)1);
86*1f5207b7SJohn Levon add_function_hook("release_resource", &match_release, (void *)0);
87*1f5207b7SJohn Levon add_function_hook("request_mem_resource", &match_request, (void *)0);
88*1f5207b7SJohn Levon add_function_hook("release_mem_resource", &match_release, (void *)0);
89*1f5207b7SJohn Levon add_hook(&match_end_func, END_FUNC_HOOK);
90*1f5207b7SJohn Levon }
91