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cyc_complexity_plugin.c
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cyc_complexity_plugin.c
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/*
* Copyright 2011-2017 by Emese Revfy <re.emese@gmail.com>
* Licensed under the GPL v2, or (at your option) v3
*
* Homepage:
* https://github.com/ephox-gcc-plugins/cyclomatic_complexity
*
* http://en.wikipedia.org/wiki/Cyclomatic_complexity
* The complexity M is then defined as:
* M = E - N + 2P
* where
*
* E = the number of edges of the graph
* N = the number of nodes of the graph
* P = the number of connected components (exit nodes).
*
* Options:
* -fplugin-arg-cyc_complexity_plugin-log_file
*
* Usage (4.5 - 6):
* $ make clean; make run
*/
#include "gcc-common.h"
__visible int plugin_is_GPL_compatible;
bool has_log_file;
FILE *log_file;
static struct plugin_info cyc_complexity_plugin_info = {
.version = "20170221",
.help = "Cyclomatic Complexity\n",
};
static unsigned int cyc_complexity_execute(void)
{
int complexity;
expanded_location xloc;
/* M = E - N + 2P */
complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2;
xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl));
fprintf(log_file, "%s%s:%d:%d:%s\t%d\n", has_log_file ? "" : "Cyclomatic Complexity ",
xloc.file, xloc.line, xloc.column, DECL_NAME_POINTER(current_function_decl), complexity);
return 0;
}
static void cyc_complexity_start_unit(void __unused *gcc_data, void __unused *user_data)
{
char *filename;
if (!has_log_file) {
log_file = stderr;
return;
}
filename = concat(aux_base_name, ".", "cyc_complexity", NULL);
log_file = fopen(filename, "w");
if (!log_file)
error("Can't open %s for writing.", filename);
free(filename);
}
static void cyc_complexity_finish_unit(void __unused *gcc_data, void __unused *user_data)
{
if (has_log_file)
fclose(log_file);
}
#define PASS_NAME cyc_complexity
#define NO_GATE
#define TODO_FLAGS_FINISH TODO_dump_func
#include "gcc-generate-gimple-pass.h"
__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
{
int i;
const char * const plugin_name = plugin_info->base_name;
const int argc = plugin_info->argc;
const struct plugin_argument * const argv = plugin_info->argv;
PASS_INFO(cyc_complexity, "ssa", 1, PASS_POS_INSERT_AFTER);
if (!plugin_default_version_check(version, &gcc_version)) {
error_gcc_version(version);
return 1;
}
for (i = 0; i < argc; ++i) {
if (!strcmp(argv[i].key, "log_file")) {
has_log_file = true;
continue;
}
error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
}
register_callback(plugin_name, PLUGIN_START_UNIT,
&cyc_complexity_start_unit, NULL);
register_callback (plugin_name, PLUGIN_FINISH_UNIT,
&cyc_complexity_finish_unit, NULL);
register_callback(plugin_name, PLUGIN_INFO, NULL,
&cyc_complexity_plugin_info);
register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
&cyc_complexity_pass_info);
return 0;
}