linux-kernel - Re: [kernel-hardening] [PATCH v8 3/4] Add Cyclomatic complexity GCC plugin

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Message-ID: <573C26DC.6020607@au1.ibm.com>
Date:	Wed, 18 May 2016 18:25:00 +1000
From:	Andrew Donnellan <andrew.donnellan@....ibm.com>
To:	kernel-hardening@...ts.openwall.com, linux-kbuild@...r.kernel.org
Cc:	pageexec@...email.hu, spender@...ecurity.net, mmarek@...e.com,
	keescook@...omium.org, linux@...musvillemoes.dk,
	fengguang.wu@...el.com, dvyukov@...gle.com,
	linux-kernel@...r.kernel.org, david.brown@...aro.org,
	yamada.masahiro@...ionext.com
Subject: Re: [kernel-hardening] [PATCH v8 3/4] Add Cyclomatic complexity GCC
 plugin

On 13/05/16 09:58, Emese Revfy wrote:
> Add a very simple plugin to demonstrate the GCC plugin infrastructure. This GCC
> plugin computes the cyclomatic complexity of each function.

...

> +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).
> +

If this plugin is intended primarily as a demonstration it's probably 
worth mentioning this in the Kconfig description.

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited