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* First try at implementing TD pass this does not merge global nodes yet,
among other things.
* Significant rewrite of TD pass to avoid potentially N^2 algorithms if
possible. It is still not complete, but at least it's checked in now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4215 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
e25ab83a5f
commit
0e74412cee
@ -8,12 +8,13 @@
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/DataStructure.h"
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#include "llvm/Analysis/DSGraph.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "Support/Statistic.h"
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using std::map;
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using std::vector;
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#if 0
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static RegisterAnalysis<TDDataStructures>
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Y("tddatastructure", "Top-down Data Structure Analysis Closure");
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@ -41,40 +42,12 @@ bool TDDataStructures::run(Module &M) {
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return false;
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}
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// ResolveArguments - Resolve the formal and actual arguments for a function
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// call by merging the nodes for the actual arguments at the call site Call[]
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// (these were copied over from the caller's graph into the callee's graph
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// by cloneInto, and the nodes can be found from OldNodeMap) with the
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// corresponding nodes for the formal arguments in the callee.
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//
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static void ResolveArguments(std::vector<DSNodeHandle> &Call,
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Function &callee,
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std::map<Value*, DSNodeHandle> &CalleeValueMap,
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std::map<const DSNode*, DSNode*> OldNodeMap,
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bool ignoreNodeMap) {
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// Resolve all of the function formal arguments...
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Function::aiterator AI = callee.abegin();
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for (unsigned i = 2, e = Call.size(); i != e; ++i) {
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// Advance the argument iterator to the first pointer argument...
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while (!isa<PointerType>(AI->getType())) ++AI;
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// TD ...Merge the formal arg scalar with the actual arg node
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DSNode* actualArg = Call[i];
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DSNode *nodeForActual = ignoreNodeMap? actualArg : OldNodeMap[actualArg];
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assert(nodeForActual && "No node found for actual arg in callee graph!");
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DSNode *nodeForFormal = CalleeValueMap[AI]->getLink(0);
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if (nodeForFormal)
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nodeForFormal->mergeWith(nodeForActual);
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++AI;
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}
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}
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#if 0
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// MergeGlobalNodes - Merge all existing global nodes with globals
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// inlined from the callee or with globals from the GlobalsGraph.
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//
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static void MergeGlobalNodes(DSGraph& Graph,
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static void MergeGlobalNodes(DSGraph &Graph,
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map<Value*, DSNodeHandle> &OldValMap) {
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map<Value*, DSNodeHandle> &ValMap = Graph.getValueMap();
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for (map<Value*, DSNodeHandle>::iterator I = ValMap.begin(), E = ValMap.end();
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@ -97,63 +70,34 @@ static void MergeGlobalNodes(DSGraph& Graph,
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}
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}
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// Helper function to push a caller's graph into the calleeGraph,
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// once per call between the caller and the callee.
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// Remove each such resolved call from the OrigFunctionCalls vector.
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// NOTE: This may produce O(N^2) behavior because it uses linear search
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// through the vector OrigFunctionCalls to find all calls to this callee.
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//
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void TDDataStructures::pushGraphIntoCallee(DSGraph &callerGraph,
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DSGraph &calleeGraph,
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std::map<Value*, DSNodeHandle> &OldValMap,
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std::map<const DSNode*, DSNode*> &OldNodeMap) {
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#endif
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Function& caller = callerGraph.getFunction();
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/// ResolveCallSite - This method is used to link the actual arguments together
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/// with the formal arguments for a function call in the top-down closure. This
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/// method assumes that the call site arguments have been mapped into nodes
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/// local to the specified graph.
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///
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void TDDataStructures::ResolveCallSite(DSGraph &Graph,
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const BUDataStructures::CallSite &CallSite) {
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// Resolve all of the function formal arguments...
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Function &F = Graph.getFunction();
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Function::aiterator AI = F.abegin();
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// Loop over all function calls in the caller to find those to this callee
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std::vector<std::vector<DSNodeHandle> >& FunctionCalls =
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callerGraph.getOrigFunctionCalls();
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for (unsigned i = 0, ei = FunctionCalls.size(); i != ei; ++i) {
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for (unsigned i = 2, e = CallSite.Context.size(); i != e; ++i, ++AI) {
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// Advance the argument iterator to the first pointer argument...
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while (!DataStructureAnalysis::isPointerType(AI->getType())) ++AI;
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std::vector<DSNodeHandle>& Call = FunctionCalls[i];
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assert(Call.size() >= 2 && "No function pointer in Call?");
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DSNodeHandle& callee = Call[1];
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std::vector<GlobalValue*> funcPtrs(callee->getGlobals());
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// Loop over the function pointers in the call, looking for the callee
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for (unsigned f = 0; f != funcPtrs.size(); ++f) {
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// Must be a function type, so this cast MUST succeed.
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Function &callee = cast<Function>(*funcPtrs[f]);
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if (&callee != &calleeGraph.getFunction())
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continue;
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// Found a call to the callee. Inline its graph
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// copy caller pointer because inlining may modify the callers vector
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// Merge actual arguments from the caller with formals in the callee.
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// Don't use the old->new node map if this is a self-recursive call.
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ResolveArguments(Call, callee, calleeGraph.getValueMap(), OldNodeMap,
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/*ignoreNodeMap*/ &caller == &callee);
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// If its not a self-recursive call, merge global nodes in the inlined
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// graph with the corresponding global nodes in the current graph
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if (&caller != &callee)
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MergeGlobalNodes(calleeGraph, OldValMap);
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// Merge returned node in the caller with the "return" node in callee
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if (Call[0])
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calleeGraph.getRetNode()->mergeWith(OldNodeMap[Call[0]]);
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// Erase the entry in the globals vector
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funcPtrs.erase(funcPtrs.begin()+f--);
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} // for each function pointer in the call node
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} // for each original call node
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// TD ...Merge the formal arg scalar with the actual arg node
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DSNodeHandle &NodeForFormal = Graph.getNodeForValue(AI);
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if (NodeForFormal.getNode())
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NodeForFormal.mergeWith(CallSite.Context[i]);
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}
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// Merge returned node in the caller with the "return" node in callee
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if (CallSite.Context[0].getNode() && Graph.getRetNode().getNode())
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Graph.getRetNode().mergeWith(CallSite.Context[0]);
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}
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DSGraph &TDDataStructures::calculateGraph(Function &F) {
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// Make sure this graph has not already been calculated, or that we don't get
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// into an infinite loop with mutually recursive functions.
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@ -161,62 +105,84 @@ DSGraph &TDDataStructures::calculateGraph(Function &F) {
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DSGraph *&Graph = DSInfo[&F];
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if (Graph) return *Graph;
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// Copy the local version into DSInfo...
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DSGraph& BUGraph = getAnalysis<BUDataStructures>().getDSGraph(F);
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BUDataStructures &BU = getAnalysis<BUDataStructures>();
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DSGraph &BUGraph = BU.getDSGraph(F);
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Graph = new DSGraph(BUGraph);
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// Find the callers of this function recorded during the BU pass
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std::set<Function*> &PendingCallers = BUGraph.getPendingCallers();
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DEBUG(std::cerr << " [TD] Inlining callers for: " << F.getName() << "\n");
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for (std::set<Function*>::iterator I=PendingCallers.begin(),
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E=PendingCallers.end(); I != E; ++I) {
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Function& caller = **I;
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assert(! caller.isExternal() && "Externals unexpected in callers list");
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DEBUG(std::cerr << "\t [TD] Inlining " << caller.getName()
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<< " into callee: " << F.getName() << "\n");
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// These two maps keep track of where scalars in the old graph _used_
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// to point to, and of new nodes matching nodes of the old graph.
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// These remain empty if no other graph is inlined (i.e., self-recursive).
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std::map<const DSNode*, DSNode*> OldNodeMap;
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std::map<Value*, DSNodeHandle> OldValMap;
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if (&caller == &F) {
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// Self-recursive call: this can happen after a cycle of calls is inlined.
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pushGraphIntoCallee(*Graph, *Graph, OldValMap, OldNodeMap);
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}
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else {
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// Recursively compute the graph for the caller. That should
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// be fully resolved except if there is mutual recursion...
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//
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DSGraph &callerGraph = calculateGraph(caller); // Graph to inline
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DEBUG(std::cerr << "\t\t[TD] Got graph for " << caller.getName()
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<< " in: " << F.getName() << "\n");
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// Clone the caller's graph into the current graph, keeping
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// track of where scalars in the old graph _used_ to point...
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// Do this here because it only needs to happens once for each caller!
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// Strip scalars but not allocas since they are visible in callee.
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//
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DSNode *RetVal = Graph->cloneInto(callerGraph, OldValMap, OldNodeMap,
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/*StripScalars*/ true,
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/*StripAllocas*/ false,
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/*CopyCallers*/ true,
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/*CopyOrigCalls*/ false);
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pushGraphIntoCallee(callerGraph, *Graph, OldValMap, OldNodeMap);
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}
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const vector<BUDataStructures::CallSite> *CallSitesP = BU.getCallSites(F);
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if (CallSitesP == 0) {
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DEBUG(std::cerr << " [TD] No callers for: " << F.getName() << "\n");
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return *Graph; // If no call sites, the graph is the same as the BU graph!
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}
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// Loop over all call sites of this function, merging each one into this
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// graph.
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//
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DEBUG(std::cerr << " [TD] Inlining callers for: " << F.getName() << "\n");
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const vector<BUDataStructures::CallSite> &CallSites = *CallSitesP;
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for (unsigned c = 0, ce = CallSites.size(); c != ce; ++c) {
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const BUDataStructures::CallSite &CallSite = CallSites[c]; // Copy
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Function &Caller = *CallSite.Caller;
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assert(!Caller.isExternal() && "Externals function cannot 'call'!");
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DEBUG(std::cerr << "\t [TD] Inlining caller #" << c << " '"
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<< Caller.getName() << "' into callee: " << F.getName() << "\n");
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if (&Caller == &F) {
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// Self-recursive call: this can happen after a cycle of calls is inlined.
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ResolveCallSite(*Graph, CallSite);
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} else {
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// Recursively compute the graph for the Caller. That should
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// be fully resolved except if there is mutual recursion...
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//
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DSGraph &CG = calculateGraph(Caller); // Graph to inline
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DEBUG(std::cerr << "\t\t[TD] Got graph for " << Caller.getName()
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<< " in: " << F.getName() << "\n");
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// These two maps keep track of where scalars in the old graph _used_
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// to point to, and of new nodes matching nodes of the old graph.
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std::map<Value*, DSNodeHandle> OldValMap;
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std::map<const DSNode*, DSNode*> OldNodeMap;
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// Clone the Caller's graph into the current graph, keeping
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// track of where scalars in the old graph _used_ to point...
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// Do this here because it only needs to happens once for each Caller!
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// Strip scalars but not allocas since they are alive in callee.
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//
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DSNodeHandle RetVal = Graph->cloneInto(CG, OldValMap, OldNodeMap,
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/*StripScalars*/ true,
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/*StripAllocas*/ false,
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/*CopyCallers*/ true,
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/*CopyOrigCalls*/false);
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// Make a temporary copy of the call site, and transform the argument node
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// pointers.
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BUDataStructures::CallSite TmpCallSite = CallSite;
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for (unsigned i = 0, e = CallSite.Context.size(); i != e; ++i) {
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const DSNode *OldNode = TmpCallSite.Context[i].getNode();
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TmpCallSite.Context[i].setNode(OldNodeMap[OldNode]);
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}
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ResolveCallSite(*Graph, CallSite);
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#if 0
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// If its not a self-recursive call, merge global nodes in the inlined
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// graph with the corresponding global nodes in the current graph
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if (&caller != &callee)
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MergeGlobalNodes(calleeGraph, OldValMap);
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#endif
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}
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}
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#if 0
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// Recompute the Incomplete markers and eliminate unreachable nodes.
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Graph->maskIncompleteMarkers();
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Graph->markIncompleteNodes(/*markFormals*/ ! F.hasInternalLinkage()
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/*&& FIXME: NEED TO CHECK IF ALL CALLERS FOUND!*/);
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Graph->removeDeadNodes(/*KeepAllGlobals*/ false, /*KeepCalls*/ false);
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#endif
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DEBUG(std::cerr << " [TD] Done inlining callers for: " << F.getName() << " ["
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<< Graph->getGraphSize() << "+" << Graph->getFunctionCalls().size()
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@ -224,4 +190,3 @@ DSGraph &TDDataStructures::calculateGraph(Function &F) {
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return *Graph;
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}
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#endif
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