Date: Thu, 06 Sep 2012 12:00:21 +0800 From: Julian Elischer <julian@freebsd.org> To: Jonathan Anderson <jonathan@freebsd.org> Cc: freebsd-arch@freebsd.org Subject: Re: Call graphs with bsd.obj.mk Message-ID: <50481FD5.2090802@freebsd.org> In-Reply-To: <CAMGEAwCNuF-P80XgsMBm1a=vSPBhB_GNw%2Bqw5ZUmPXRC2NrsGQ@mail.gmail.com> References: <CAMGEAwCNuF-P80XgsMBm1a=vSPBhB_GNw%2Bqw5ZUmPXRC2NrsGQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 9/5/12 11:28 PM, Jonathan Anderson wrote:
> Hi all,
>
> While doing some hacking recently, I really wanted a call graph. Clang
> and LLVM make this pretty easy, assuming you have the right CFLAGS, so
> a little build system integration seemed to be in order. I did this,
> it's pretty small and modular, and I find it useful, so I'm sharing
> this work with the list in the hope of putting it into -CURRENT.
>
> I've attached two BSD makefiles that let me produce call graphs from
> any directory that includes bsd.obj.mk (which notably includes
> binaries and libraries in src):
>
> - bsd.analysis.mk contains a 'callgraph' target that produces
> ${.OBJDIR}/_callgraph_.dot
> - bsd.llvm.mk contains a few LLVM helpers (e.g. to generate LLVM IR)
>
> If you have clang, llvm-link and opt installed, this allows you to
> generate a complete call graph for C code; assembler files are ignored
> because we don't currently have assembly -> IR transformations. The
> resulting graph can be pretty large and ugly (e.g. LLVM shows an
> "external node" pseudo-function that calls everything), but it can be
> filtered with scripts like those found at
> https://github.com/trombonehero/dot-tools to produce really useful
> graphs.
>
> llvm-link and opt aren't included in the bootstrap tools, so I'm
> currently doing this by installing the llvm-devel package. Perhaps we
> might copy llvm-link and opt over to /usr/obj/usr/src/tmp, possibly
> governed by a WITH_LLVM_TOOLS flag in src.conf or something?
can you put a sample output file up somewhere? (.png or something?)
>
> Jon
>
>
> _______________________________________________
> freebsd-arch@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-arch
> To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?50481FD5.2090802>