1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2011-2016 by Emese Revfy <re.emese@gmail.com>
3*4882a593Smuzhiyun * Licensed under the GPL v2, or (at your option) v3
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Homepage:
6*4882a593Smuzhiyun * https://github.com/ephox-gcc-plugins/cyclomatic_complexity
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * https://en.wikipedia.org/wiki/Cyclomatic_complexity
9*4882a593Smuzhiyun * The complexity M is then defined as:
10*4882a593Smuzhiyun * M = E - N + 2P
11*4882a593Smuzhiyun * where
12*4882a593Smuzhiyun *
13*4882a593Smuzhiyun * E = the number of edges of the graph
14*4882a593Smuzhiyun * N = the number of nodes of the graph
15*4882a593Smuzhiyun * P = the number of connected components (exit nodes).
16*4882a593Smuzhiyun *
17*4882a593Smuzhiyun * Usage (4.5 - 5):
18*4882a593Smuzhiyun * $ make clean; make run
19*4882a593Smuzhiyun */
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include "gcc-common.h"
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun __visible int plugin_is_GPL_compatible;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static struct plugin_info cyc_complexity_plugin_info = {
26*4882a593Smuzhiyun .version = "20160225",
27*4882a593Smuzhiyun .help = "Cyclomatic Complexity\n",
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
cyc_complexity_execute(void)30*4882a593Smuzhiyun static unsigned int cyc_complexity_execute(void)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun int complexity;
33*4882a593Smuzhiyun expanded_location xloc;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun /* M = E - N + 2P */
36*4882a593Smuzhiyun complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl));
39*4882a593Smuzhiyun fprintf(stderr, "Cyclomatic Complexity %d %s:%s\n", complexity,
40*4882a593Smuzhiyun xloc.file, DECL_NAME_POINTER(current_function_decl));
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return 0;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun #define PASS_NAME cyc_complexity
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #define NO_GATE
48*4882a593Smuzhiyun #define TODO_FLAGS_FINISH TODO_dump_func
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun #include "gcc-generate-gimple-pass.h"
51*4882a593Smuzhiyun
plugin_init(struct plugin_name_args * plugin_info,struct plugin_gcc_version * version)52*4882a593Smuzhiyun __visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun const char * const plugin_name = plugin_info->base_name;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun PASS_INFO(cyc_complexity, "ssa", 1, PASS_POS_INSERT_AFTER);
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun if (!plugin_default_version_check(version, &gcc_version)) {
59*4882a593Smuzhiyun error(G_("incompatible gcc/plugin versions"));
60*4882a593Smuzhiyun return 1;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun register_callback(plugin_name, PLUGIN_INFO, NULL,
64*4882a593Smuzhiyun &cyc_complexity_plugin_info);
65*4882a593Smuzhiyun register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
66*4882a593Smuzhiyun &cyc_complexity_pass_info);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun return 0;
69*4882a593Smuzhiyun }
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