Hi Daniel,
Firstly, I am also not an expert in WOPT and Open64. The following is
just for some of clue that maybe helpful to you.
1. Whirl is AST based IR, while the in/out list used in Data-flow
analysis is based on BB and CFG.
2. According to the Pre_Optimizer() in be/opt/opt_main.cxx. At the
beginning of WOPT, WHIRL IR will be translated into CFG ( a different IR
for SSA-based DFA analysis) after comp_unit->Ssa()->Construct().
3. set a breakpoint after the SSA construction using gdb, and run
comp_unit->Ssa()->Print(), Comp_unit->Cfg()->Print(stderr,1,-1),
Cr->Print_str(true), cr->Print_node(1,stderr), Sr->Print(stderr),
BB_Node->Print(stderr) for object of comp_unit, CODEREP, STMTREP, BB_Node
may help understand what is going on during the OPT, and also help you to
get an idea of how the in/out is generated.
4. If you want to know the actual definition of in/out list of BBs in
CFG of WOPT, looking into the code of opt_bb.cxx/h may be a good start.
Regards,
Kun Ling
On Sat, Oct 12, 2013 at 6:46 AM, daniel tian <xti...@uh.edu> wrote:
> hey guys:
> I have a question about how to get the in/out variables list for a
> block in high level whirl? I checked the def/use chain. But there is no
> such thing in WOPT. I mean there must be a existing module to analysis a
> input block and get the in/out list.
>
> For example:
>
> Block1:
>
> sum = 0;
> for(i=0; i<n; i++)
> {
> A[i] = B[c] + C[c]
> sum+=A[i];
> }
>
> For here, this block require the input list"B, C, n", and the output is
> "A, sum". And "i" is obviously defined in the block. BTW, here the block is
> in IR, but not three address code.
>
> Does anyone have clue?
> Any suggestion is appreciated.
>
> Thank you very much.
> Daniel
>
>
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