Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / scripts / gcc-plugins / cyc_complexity_plugin.c
blob73124c2b3eddabd88a2e83f93442d0855da72d2e
1 /*
2 * Copyright 2011-2016 by Emese Revfy <re.emese@gmail.com>
3 * Licensed under the GPL v2, or (at your option) v3
5 * Homepage:
6 * https://github.com/ephox-gcc-plugins/cyclomatic_complexity
8 * https://en.wikipedia.org/wiki/Cyclomatic_complexity
9 * The complexity M is then defined as:
10 * M = E - N + 2P
11 * where
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).
17 * Usage (4.5 - 5):
18 * $ make clean; make run
21 #include "gcc-common.h"
23 __visible int plugin_is_GPL_compatible;
25 static struct plugin_info cyc_complexity_plugin_info = {
26 .version = "20160225",
27 .help = "Cyclomatic Complexity\n",
30 static unsigned int cyc_complexity_execute(void)
32 int complexity;
33 expanded_location xloc;
35 /* M = E - N + 2P */
36 complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2;
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));
42 return 0;
45 #define PASS_NAME cyc_complexity
47 #define NO_GATE
48 #define TODO_FLAGS_FINISH TODO_dump_func
50 #include "gcc-generate-gimple-pass.h"
52 __visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
54 const char * const plugin_name = plugin_info->base_name;
56 PASS_INFO(cyc_complexity, "ssa", 1, PASS_POS_INSERT_AFTER);
58 if (!plugin_default_version_check(version, &gcc_version)) {
59 error(G_("incompatible gcc/plugin versions"));
60 return 1;
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);
68 return 0;