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Rename the Region::block_iterator to Region::block_node_iterator, and

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add a new Region::block_iterator which actually iterates over the basic
blocks of the region.

The old iterator, now call 'block_node_iterator' iterates over
RegionNodes which contain a single basic block. This works well with the
GraphTraits-based iterator design, however most users actually want an
iterator over the BasicBlocks inside these RegionNodes. Now the
'block_iterator' is a wrapper which exposes exactly this interface.
Internally it uses the block_node_iterator to walk all nodes which are
single basic blocks, but transparently unwraps the basic block to make
user code simpler.

While this patch is a bit of a wash, most of the updates are to internal
users, not external users of the RegionInfo. I have an accompanying
patch to Polly that is a strict simplification of every user of this
interface, and I'm working on a pass that also wants the same simplified
interface.

This patch alone should have no functional impact.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156202 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2012-05-04 20:55:23 +00:00
parent 49683f3c96
commit 7c52c97a22
4 changed files with 87 additions and 18 deletions
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8
lib/Analysis/RegionPrinter.cpp
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@ -122,13 +122,11 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
RegionInfo *RI = R->getRegionInfo();
for (Region::const_block_iterator BI = R->block_begin(),
BE = R->block_end(); BI != BE; ++BI) {
BasicBlock *BB = (*BI)->getNodeAs<BasicBlock>();
if (RI->getRegionFor(BB) == R)
BE = R->block_end(); BI != BE; ++BI)
if (RI->getRegionFor(*BI) == R)
O.indent(2 * (depth + 1)) << "Node"
<< static_cast<const void*>(RI->getTopLevelRegion()->getBBNode(BB))
<< static_cast<const void*>(RI->getTopLevelRegion()->getBBNode(*BI))
<< ";\n";
}
O.indent(2 * depth) << "}\n";
}