Add Cyclomatic complexity GCC plugin (0dae776c) · Commits · 戴 / test

arch/Kconfig

+12 −0

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		@@ -372,6 +372,18 @@ menuconfig GCC_PLUGINS

		See Documentation/gcc-plugins.txt for details.

		config GCC_PLUGIN_CYC_COMPLEXITY
		bool "Compute the cyclomatic complexity of a function"
		depends on GCC_PLUGINS
		help
		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).

		config HAVE_CC_STACKPROTECTOR
		bool
		help

scripts/Makefile.gcc-plugins

+1 −0

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		@@ -2,6 +2,7 @@ ifdef CONFIG_GCC_PLUGINS
		__PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
		PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")

		gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so
		GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))

		export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN

scripts/gcc-plugins/Makefile

+1 −0

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		@@ -17,4 +17,5 @@ export GCCPLUGINS_DIR HOSTLIBS
		$(HOSTLIBS)-y := $(GCC_PLUGIN)
		always := $($(HOSTLIBS)-y)

		cyc_complexity_plugin-objs := cyc_complexity_plugin.o
		clean-files += *.so

scripts/gcc-plugins/cyc_complexity_plugin.c

0 → 100644

+73 −0

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		/*
		* 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;
		}

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