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Add new method for computing node mappings. This is used by the pool allocator

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9880 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-11-11 05:08:59 +00:00
parent 3b120be94f
commit 400433dfea
1 changed files with 31 additions and 0 deletions
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31
lib/Analysis/DataStructure/DataStructure.cpp
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@@ -1638,3 +1638,34 @@ void DSGraph::mergeInGlobalsGraph() {
OldRetNodes.clear(); OldRetNodes.clear();
removeTriviallyDeadNodes(); removeTriviallyDeadNodes();
} }
/// computeNodeMapping - Given roots in two different DSGraphs, traverse the
/// nodes reachable from the two graphs, computing the mapping of nodes from
/// the first to the second graph.
///
void DSGraph::computeNodeMapping(const DSNodeHandle &NH1,
const DSNodeHandle &NH2, NodeMapTy &NodeMap) {
DSNode *N1 = NH1.getNode(), *N2 = NH2.getNode();
if (N1 == 0 || N2 == 0) return;
DSNodeHandle &Entry = NodeMap[N1];
if (Entry.getNode()) {
// Termination of recursion!
assert(Entry.getNode() == N2 &&
Entry.getOffset() == (NH1.getOffset()+NH2.getOffset()) &&
"Inconsistent mapping detected!");
return;
}
Entry.setNode(N2);
Entry.setOffset(NH1.getOffset()+NH2.getOffset());
// Loop over all of the fields that N1 and N2 have in common, recursively
// mapping the edges together now.
int N2Idx = NH2.getOffset()-NH1.getOffset();
unsigned N2Size = N2->getSize();
for (unsigned i = 0, e = N1->getSize(); i < e; i += DS::PointerSize)
if (unsigned(N2Idx)+i < N2Size)
computeNodeMapping(N1->getLink(i), N2->getLink(N2Idx+i), NodeMap);
}