I investigated the MachineFunctionPass (that is runOnMachineFunction, I believe). In my experimentation it didn't seem that the MachineFrameInfo was populated (it consistently said that the stack depth was 0, for example). I might have been doing something wrong? <br>
<br><div class="gmail_quote">On Fri, Jul 8, 2011 at 5:21 PM, John Criswell <span dir="ltr"><<a href="mailto:criswell@illinois.edu">criswell@illinois.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#FFFFFF" text="#000000"><div><div></div><div class="h5">
On 7/8/11 4:09 PM, Andrew Ruef wrote:
<blockquote type="cite">
Hi list,
<div><br>
</div>
<div>I am trying to implement the technique outlined in the
following paper: <a href="http://www.cs.umd.edu/%7Emwh/papers/martin10ownership.html" target="_blank">http://www.cs.umd.edu/~mwh/papers/martin10ownership.html</a> in
LLVM. My approach so far involves the use of an IR level
transform (via runOnFunction) to identify memory loads and
stores. One thing I need to do (I am pretty sure I need to do it
at least) is automatically mark each stack frame as "owned" by
the current thread. </div>
<div><br>
</div>
<div>I'm not sure where the best place in the LLVM architecture to
do this is. As I currently understand it, the concept of a stack
frame appears pretty late in target code generation. I've hacked
in a hook for this in X86FrameLowering.cpp in the emitPrologue
and emitEpilogue methods. </div>
<div><br>
</div>
<div>Is there a cleaner way I can do this? Is there a way I can
subclass the X86 code generator to "hook" those two methods and
insert my instrumentation? Is there something I'm missing with
runOnMachineFunction? <br>
</div>
</blockquote>
<br></div></div>
I'm stepping beyond what I know a little bit, but have you looked at
writing a MachineFunctionPass? A student here at Illinois wrote a
MachineFunctionPass to insert additional epilogue code into
functions. Assuming that it's possible, putting your functionality
into a MachineFunctionPass should be cleaner than modifying the code
generator directly (MachineFunctionPass'es may even be load-able
into llc).<br>
<br>
Check out the doxygen docs for MachineFunctionPass
(<a href="http://llvm.org/doxygen/classllvm_1_1MachineFunctionPass.html" target="_blank">http://llvm.org/doxygen/classllvm_1_1MachineFunctionPass.html</a>),
MachineFunction
(<a href="http://llvm.org/doxygen/classllvm_1_1MachineFunction.html" target="_blank">http://llvm.org/doxygen/classllvm_1_1MachineFunction.html</a>), and
MachineFrameInfo
(<a href="http://llvm.org/doxygen/classllvm_1_1MachineFrameInfo.html" target="_blank">http://llvm.org/doxygen/classllvm_1_1MachineFrameInfo.html</a>).<br>
<br>
-- John T.<br>
<br>
<blockquote type="cite">
<div><br>
</div>
<div>Thank you, <br>
<div><br>
</div>
<div>Andrew</div>
</div>
<br>
<fieldset></fieldset>
<br>
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</pre>
</blockquote>
<br>
</div>
</blockquote></div><br>