[LLVMdev] Running specific passes

[Chris Lattner]

On Mon, 29 Nov 2004, Vladimir Prus wrote:
> On Friday 26 November 2004 19:56, Chris Lattner wrote:
> > On Fri, 26 Nov 2004, Vladimir Prus wrote:
> > > in the implementation of some analysis, I need to change the program and
> > > then invoke Mem2Reg pass. That pass, in turn, requires other analysis, so
> > > I must
> >
> > Usually you want to do this at a higher level, why not just use 'opt
> > -yourpass -mem2reg'?
>
> Because my pass must first modify the code, then run mem2reg pass and then do
> some more work. There's absolutely no way it could work without mem2reg pass.
> (That's the value analysis path I talked about earlier).

ok

> > Alternatively, if you don't want to do that, you can build mem2reg into
> > your pass if it works better.  To do this, your pass needs to
> > 'addRequired' DominatorTree and DominatorFrontier, then use the
> > interfaces exposed through
> > include/llvm/Transforms/Utils/PromoteMemToReg.h.
>
> This still leaves the question of TargetData parameter -- which is not used by
> the PromoteMemToReg function, AFAICT. Passing *(TargetData*)0 is dirty.

Just addRequired<TargetData>(), and pass in getAnalysis<TargetData>() as
appropriate.

-Chris

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