[LLVMdev] DOTGraphTraits and GraphWriter

[Dan Gohman]

Hi Prakash,

I don't know of an easy way to do this, other than to use random-access
iterators so you can compute the distance between the edge and the
beginning of the list of edges.

Dan

On Sep 16, 2008, at 2:58 PM, Prakash Prabhu wrote:

> Hi Dan,
>
> Thanks for the reply. I got the labels for each outgoing edge (at the
> source node's 'structure' field) working. Is there a way to find out
> the outgoing edge number from EdgeIter. (Basically the Node in my
> graph has a a bunch of outgoing edges, so that I can just index into
> that collection within the node to get the appropriate edges'
> attributes).
>
> regards,
> Prakash
>
> On Tue, Sep 16, 2008 at 3:59 PM, Dan Gohman <gohman at apple.com> wrote:
>> Hello Prakash,
>>
>> The SelectionDAG viewers (llc -view-isel-dags etc.) support
>> both multiple edges between the same pair of nodes, and labels
>> at least for each incoming edge. See
>> lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp for code you
>> might use as an example, though it is a bit tricky.
>>
>> Dan
>>
>> On Sep 15, 2008, at 3:15 PM, Prakash Prabhu wrote:
>>
>>> Hi all,
>>>
>>> I have two questions related to .dot graph output. Basically, I  
>>> have a
>>> graph representing a program dependence graph like structure with
>>> (a) multiple edges between the same pair of nodes
>>> (b) each edge having a special (different) text/label
>>>
>>> I implemented a template-specialized version of DotGraphTraits for  
>>> the
>>> my graph structure which given a node, uses a map_iterator  
>>> (similar to
>>> the one used in CallGraph) to get the destination node of an  
>>> outgoing
>>> edge. This works fine except that I have no clue how to support (a)
>>> and (b) since once the destination node is returned I lose access to
>>> the edge and cannot do any text annotation onto an edge of the  
>>> graph.
>>>
>>> Is there some other way to achieve (a) and (b) without having to
>>> implement my own special version of GraphWriter ?
>>>
>>> thanks,
>>> Prakash
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