llvm dev - Nov 2002 - [LLVMdev] get TopDown DSGraph

Dear LLVM,

I was wondering if this is the right way to get TopDown DSGraph?

TDDataStructures &TD = getAnalysis<TDDataStructures>();
F is some function
DSGraph &dsg = TD.getDSGraph(F);

I found out the DSGraph I got using this method is actually bottom up
DSGraph, can you let me know why?

Thanks,
xiaodong

> I was wondering if this is the right way to get TopDown DSGraph?
> TDDataStructures &TD = getAnalysis<TDDataStructures>();
> F is some function
> DSGraph &dsg = TD.getDSGraph(F);
Yes, that's the right way.
> I found out the DSGraph I got using this method is actually bottom up
> DSGraph, can you let me know why?
Why do you think it's a BU graph?

-Chris

-- 
http://llvm.cs.uiuc.edu/
http://www.nondot.org/~sabre/Projects/

Thanks, Chris. Actually I got the following graph from my program:

digraph DataStructures {
  label="Function fini";
  edge [arrowtail="dot"];
  size="10,7.5";
  rotate="90";

  Node0x100ae1c40 [shape=record,shape=Mrecord,label="{ %struct.a:
HIMR\n|{<g0>|<g1>|<g2>}}"];
  Node0x100ae1c40:g1 -> Node0x100ae1e00;
  Node0x100ae1c40:g2 -> Node0x100ae1fc0;
  Node0x100ae1e00 [shape=record,shape=Mrecord,label="{ %struct.a:
HIMR\n|{<g0>|<g1>|<g2>}}"];
  Node0x100ae1e00:g1 -> Node0x100ae0b30;
  Node0x100ae1e00:g2 -> Node0x100ae1d20;
  Node0x100ae0b30 [shape=record,shape=Mrecord,label="{ void: HI\n}"];
  Node0x100ae1d20 [shape=record,shape=Mrecord,label="{ void: HI\n}"];
  Node0x100ae1fc0 [shape=record,shape=Mrecord,label="{ void: HI\n}"];
  Node0x100aebf90[ plaintext=circle, label =" %my"];
  Node0x100aebf90 -> Node0x100ae1c40[arrowtail=tee,color=gray63];

If you look at it, you'll see each node has the InComplete Bit on.
But when I use 'analyze -tddatastructure file.bc' I got the graph in
which
all the nodes don't have the bit on. So they are different. Could you tell
me why the results from the analyze tool and from the dsg.dump() are
different?

Besides, each time I call the getAnaysis<TDDataStructure>(), it writes out
some bu_funname.dot files to the disk. Why is that?

Thanks,
xiaodong

On Thu, 21 Nov 2002, Chris Lattner wrote:
> > I was wondering if this is the right way to get TopDown DSGraph?
> > TDDataStructures &TD = getAnalysis<TDDataStructures>();
> > F is some function
> > DSGraph &dsg = TD.getDSGraph(F);
>
> Yes, that's the right way.
>
> > I found out the DSGraph I got using this method is actually bottom up
> > DSGraph, can you let me know why?
>
> Why do you think it's a BU graph?
>
> -Chris
>
> --
> http://llvm.cs.uiuc.edu/
> http://www.nondot.org/~sabre/Projects/
>
>