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Finegrainify namespacification 

Move method out of generic dominators construction code

llvm-svn: 10299
This commit is contained in:
Chris Lattner 2003-12-07 00:35:42 +00:00
parent d48220fabe
commit f9f7c2d302
1 changed files with 38 additions and 3 deletions
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41
llvm/lib/Analysis/PostDominators.cpp
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@ -16,8 +16,7 @@
#include "llvm/Support/CFG.h"
#include "Support/DepthFirstIterator.h"
#include "Support/SetOperations.h"
namespace llvm {
using namespace llvm;
//===----------------------------------------------------------------------===//
// PostDominatorSet Implementation
@ -110,6 +109,43 @@ bool PostDominatorSet::runOnFunction(Function &F) {
static RegisterAnalysis<ImmediatePostDominators>
D("postidom", "Immediate Post-Dominators Construction", true);
// calcIDoms - Calculate the immediate dominator mapping, given a set of
// dominators for every basic block.
void ImmediatePostDominators::calcIDoms(const DominatorSetBase &DS) {
// Loop over all of the nodes that have dominators... figuring out the IDOM
// for each node...
//
for (DominatorSet::const_iterator DI = DS.begin(), DEnd = DS.end();
DI != DEnd; ++DI) {
BasicBlock *BB = DI->first;
const DominatorSet::DomSetType &Dominators = DI->second;
unsigned DomSetSize = Dominators.size();
if (DomSetSize == 1) continue; // Root node... IDom = null
// Loop over all dominators of this node. This corresponds to looping over
// nodes in the dominator chain, looking for a node whose dominator set is
// equal to the current nodes, except that the current node does not exist
// in it. This means that it is one level higher in the dom chain than the
// current node, and it is our idom!
//
DominatorSet::DomSetType::const_iterator I = Dominators.begin();
DominatorSet::DomSetType::const_iterator End = Dominators.end();
for (; I != End; ++I) { // Iterate over dominators...
// All of our dominators should form a chain, where the number of elements
// in the dominator set indicates what level the node is at in the chain.
// We want the node immediately above us, so it will have an identical
// dominator set, except that BB will not dominate it... therefore it's
// dominator set size will be one less than BB's...
//
if (DS.getDominators(*I).size() == DomSetSize - 1) {
IDoms[BB] = *I;
break;
}
}
}
}
//===----------------------------------------------------------------------===//
// PostDominatorTree Implementation
//===----------------------------------------------------------------------===//
@ -217,4 +253,3 @@ PostDominanceFrontier::calculate(const PostDominatorTree &DT,
void PostDominanceFrontier::stub() {
}
} // End llvm namespace