1/*
 2 * Copyright 2011-2016 by Emese Revfy <re.emese@gmail.com>
 3 * Licensed under the GPL v2, or (at your option) v3
 4 *
 5 * Homepage:
 6 * https://github.com/ephox-gcc-plugins/cyclomatic_complexity
 7 *
 8 * https://en.wikipedia.org/wiki/Cyclomatic_complexity
 9 * The complexity M is then defined as:
10 * M = E - N + 2P
11 * where
12 *
13 *  E = the number of edges of the graph
14 *  N = the number of nodes of the graph
15 *  P = the number of connected components (exit nodes).
16 *
17 * Usage (4.5 - 5):
18 * $ make clean; make run
19 */
20
21#include "gcc-common.h"
22
23__visible int plugin_is_GPL_compatible;
24
25static struct plugin_info cyc_complexity_plugin_info = {
26	.version	= "20160225",
27	.help		= "Cyclomatic Complexity\n",
28};
29
30static unsigned int cyc_complexity_execute(void)
31{
32	int complexity;
33	expanded_location xloc;
34
35	/* M = E - N + 2P */
36	complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2;
37
38	xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl));
39	fprintf(stderr, "Cyclomatic Complexity %d %s:%s\n", complexity,
40		xloc.file, DECL_NAME_POINTER(current_function_decl));
41
42	return 0;
43}
44
45#define PASS_NAME cyc_complexity
46
47#define NO_GATE
48#define TODO_FLAGS_FINISH TODO_dump_func
49
50#include "gcc-generate-gimple-pass.h"
51
52__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
53{
54	const char * const plugin_name = plugin_info->base_name;
55
56	PASS_INFO(cyc_complexity, "ssa", 1, PASS_POS_INSERT_AFTER);
57
58	if (!plugin_default_version_check(version, &gcc_version)) {
59		error(G_("incompatible gcc/plugin versions"));
60		return 1;
61	}
62
63	register_callback(plugin_name, PLUGIN_INFO, NULL,
64				&cyc_complexity_plugin_info);
65	register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
66				&cyc_complexity_pass_info);
67
68	return 0;
69}