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Fix a DSA bug that caused DSA to generate incredibly huge graphs and take forever to

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do it on povray.  The problem is that we were not copying globals from callees to
callers unless the existed in both graphs.  We should have copied them in the case
where the global pointed to a node that was copied as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12104 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-03-03 22:01:09 +00:00
parent 66be3c8f72
commit c4ebdcea7a
1 changed files with 34 additions and 1 deletions

35
lib/Analysis/DataStructure/DataStructure.cpp

@ -11,7 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DSGraph.h"
#include "llvm/Analysis/DSGraphTraits.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/iOther.h"
@ -20,6 +20,7 @@
#include "llvm/Assembly/Writer.h"
#include "Support/CommandLine.h"
#include "Support/Debug.h"
#include "Support/DepthFirstIterator.h"
#include "Support/STLExtras.h"
#include "Support/Statistic.h"
#include "Support/Timer.h"
@ -1181,6 +1182,13 @@ void DSGraph::cloneInto(const DSGraph &G, DSScalarMap &OldValMap,
}
}
static bool PathExistsToClonedNode(const DSNode *N, ReachabilityCloner &RC) {
for (df_iterator<const DSNode*> I = df_begin(N), E = df_end(N); I != E; ++I)
if (RC.hasClonedNode(*I))
return true;
return false;
}
/// mergeInGraph - The method is used for merging graphs together. If the
/// argument graph is not *this, it makes a clone of the specified graph, then
@ -1240,11 +1248,36 @@ void DSGraph::mergeInGraph(const DSCallSite &CS, Function &F,
}
// Clone over all globals that appear in the caller and callee graphs.
hash_set<GlobalVariable*> NonCopiedGlobals;
for (DSScalarMap::global_iterator GI = Graph.getScalarMap().global_begin(),
E = Graph.getScalarMap().global_end(); GI != E; ++GI)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(*GI))
if (ScalarMap.count(GV))
RC.merge(ScalarMap[GV], Graph.getNodeForValue(GV));
else
NonCopiedGlobals.insert(GV);
// If the global does not appear in the callers graph we generally don't
// want to copy the node. However, if there is a path from the node global
// node to a node that we did copy in the graph, we *must* copy it to
// maintain the connection information. Every time we decide to include a
// new global, this might make other globals live, so we must iterate
// unfortunately.
bool MadeChange = false;
for (hash_set<GlobalVariable*>::iterator I = NonCopiedGlobals.begin();
I != NonCopiedGlobals.end();) {
DSNode *GlobalNode = Graph.getNodeForValue(*I).getNode();
if (RC.hasClonedNode(GlobalNode)) {
// Already cloned it, remove from set.
NonCopiedGlobals.erase(I++);
} else if (PathExistsToClonedNode(GlobalNode, RC)) {
RC.getClonedNH(Graph.getNodeForValue(*I));
NonCopiedGlobals.erase(I++);
} else {
++I;
}
}
} else {
DSNodeHandle RetVal = getReturnNodeFor(F);