mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
0dae776c6b
Add a very simple plugin to demonstrate the GCC plugin infrastructure. This GCC plugin computes the cyclomatic complexity of each function. The complexity M of a function's control flow graph is defined as: M = E - N + 2P where E = the number of edges N = the number of nodes P = the number of connected components (exit nodes). Signed-off-by: Emese Revfy <re.emese@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Michal Marek <mmarek@suse.com>
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
|
|
* Copyright 2011-2016 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).
|
|
*
|
|
* Usage (4.5 - 5):
|
|
* $ make clean; make run
|
|
*/
|
|
|
|
#include "gcc-common.h"
|
|
|
|
int plugin_is_GPL_compatible;
|
|
|
|
static struct plugin_info cyc_complexity_plugin_info = {
|
|
.version = "20160225",
|
|
.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(stderr, "Cyclomatic Complexity %d %s:%s\n", complexity,
|
|
xloc.file, DECL_NAME_POINTER(current_function_decl));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define PASS_NAME cyc_complexity
|
|
|
|
#define NO_GATE
|
|
#define TODO_FLAGS_FINISH TODO_dump_func
|
|
|
|
#include "gcc-generate-gimple-pass.h"
|
|
|
|
int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
|
|
{
|
|
const char * const plugin_name = plugin_info->base_name;
|
|
struct register_pass_info cyc_complexity_pass_info;
|
|
|
|
cyc_complexity_pass_info.pass = make_cyc_complexity_pass();
|
|
cyc_complexity_pass_info.reference_pass_name = "ssa";
|
|
cyc_complexity_pass_info.ref_pass_instance_number = 1;
|
|
cyc_complexity_pass_info.pos_op = PASS_POS_INSERT_AFTER;
|
|
|
|
if (!plugin_default_version_check(version, &gcc_version)) {
|
|
error(G_("incompatible gcc/plugin versions"));
|
|
return 1;
|
|
}
|
|
|
|
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;
|
|
}
|