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RegionPrinter: Ignore back edges when layouting the graph

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126564 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tobias Grosser 2011-02-27 04:11:07 +00:00
parent f3a83d6d0b
commit 3091c92eed
1 changed files with 26 additions and 0 deletions
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26
lib/Analysis/RegionPrinter.cpp
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@ -70,6 +70,32 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
G->getTopLevelRegion());
}
std::string getEdgeAttributes(RegionNode *srcNode,
GraphTraits<RegionInfo*>::ChildIteratorType CI, RegionInfo *RI) {
RegionNode *destNode = *CI;
if (srcNode->isSubRegion() || destNode->isSubRegion())
return "";
// In case of a backedge, do not use it to define the layout of the nodes.
BasicBlock *srcBB = srcNode->getNodeAs<BasicBlock>();
BasicBlock *destBB = destNode->getNodeAs<BasicBlock>();
Region *R = RI->getRegionFor(destBB);
while (R && R->getParent())
if (R->getParent()->getEntry() == destBB)
R = R->getParent();
else
break;
if (R->getEntry() == destBB && R->contains(srcBB))
return "constraint=false";
return "";
}
// Print the cluster of the subregions. This groups the single basic blocks
// and adds a different background color for each group.
static void printRegionCluster(const Region *R, GraphWriter<RegionInfo*> &GW,