[LLVMdev] DSGraph questions

[Xiaodong Li]

Dear Prof. Adve,

I recently checked out the llvm using
cvs update
command under the llvm directory. But when I went to see the DSNode.h,
there is no getPointerSize function. I checked the doxygen tree, it's
there. So that means I didn't update my cvs tree correctly. Could you let
me know how to update my CVS tree? Or there is a problem at somewhere
else?

Thanks,
xiaodong

On Sun, 10 Nov 2002, Vikram Adve wrote:

> I'll try to answer these because Chris is really busy this week.
>
>
> > From: Xiaodong Li <xli3 at santoor.cs.uiuc.edu>
> > Subject: [LLVMdev] DSGraph questions
> > Sender: llvmdev-admin at cs.uiuc.edu
> > Date: Sun, 10 Nov 2002 11:25:53 -0600 (CST)
> >
> > 1. What is the difference between DSNodeHandle and DSNode? What do the
> > functions getLink() and getSize() do?
>
>
> DSNodeHandle is essentially like an edge in the DSGraph.
> It serves two main purposes:
> (1) It keeps track of which byte offset is being pointed to within
>     the target node.
> (2) It keeps track of how many objects have pointers to a DSNode,
>     so that it can check if the number is zero and free a node
>     (reference counting)
>
> getLink(Offset) returns the outgoing edge at byte offset "Offset"
> from the current node.  (think of each node as a struct, so there
> can be pointers at different byte offsets within the struct.)
>
> getSize() returns the max #bytes for any object folded into this node.
>
>
> > 2. In the previous email, you mentioned that we can use
> > DSNode::getPointerSize() to get the number of links, But I checked the
> > doxygen documentation, there is no such member for DSNode.
>
>
> Check the header file.  The doxygen docs were a little out of date
> (but Chris has updated them now).
>
>
>
> > 3. Previously I use the following code:
> > for( df_iterator<DSNode*> I = df_begin(pnode), E=df_end(pnode); I!=E; ++i)
> > {
> >   ...           ;
> > }
> > and got lots of error messages when I compile. And the reply was:
> > >What is the type of pnode?  Guessing from the error message, I would think
> > >it's a 'const DSNode*'.  You need to use either df_iterator<const DSNode*>
> > >or a DSNode* argument, you can't mix them.
> >
> > I checked and found out that I was using
> > DSNode *pnode = dsg->getNodeforValue(fi).getNode() to get pnode.
> > So I think it's a DSNode.
>
>
> I would have to see the error messages.  In generally, if you have any
> const variables or functions, you will get lots of error messages unless
> you use them very carefully.
>
> --Vikram
> http://www.cs.uiuc.edu/~vadve
>