//===- BottomUpClosure.cpp - Compute bottom-up interprocedural closure ----===//
//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
// This file implements the BUDataStructures class, which represents the
// Bottom-Up Interprocedural closure of the data structure graph over the
// program. This is useful for applications like pool allocation, but **not**
//
//===----------------------------------------------------------------------===//
-#include "llvm/Analysis/DataStructure.h"
-#include "llvm/Analysis/DSGraph.h"
+#include "llvm/Analysis/DataStructure/DataStructure.h"
+#include "llvm/Analysis/DataStructure/DSGraph.h"
#include "llvm/Module.h"
-#include "Support/Statistic.h"
-#include "Support/hash_map"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Timer.h"
+using namespace llvm;
namespace {
Statistic<> MaxSCC("budatastructure", "Maximum SCC Size in Call Graph");
-
+ Statistic<> NumBUInlines("budatastructures", "Number of graphs inlined");
+ Statistic<> NumCallEdges("budatastructures", "Number of 'actual' call edges");
+
RegisterAnalysis<BUDataStructures>
X("budatastructure", "Bottom-up Data Structure Analysis");
}
-using namespace DS;
-
-static bool isVAHackFn(const Function *F) {
- return F->getName() == "printf" || F->getName() == "sscanf" ||
- F->getName() == "fprintf" || F->getName() == "open" ||
- F->getName() == "sprintf" || F->getName() == "fputs" ||
- F->getName() == "fscanf";
-}
-
-// isCompleteNode - Return true if we know all of the targets of this node, and
-// if the call sites are not external.
-//
-static inline bool isCompleteNode(DSNode *N) {
- if (N->isIncomplete()) return false;
- const std::vector<GlobalValue*> &Callees = N->getGlobals();
- for (unsigned i = 0, e = Callees.size(); i != e; ++i)
- if (Callees[i]->isExternal())
- if (!isVAHackFn(cast<Function>(Callees[i])))
- return false; // External function found...
- return true; // otherwise ok
-}
-
-struct CallSiteIterator {
- // FCs are the edges out of the current node are the call site targets...
- std::vector<DSCallSite> *FCs;
- unsigned CallSite;
- unsigned CallSiteEntry;
-
- CallSiteIterator(std::vector<DSCallSite> &CS) : FCs(&CS) {
- CallSite = 0; CallSiteEntry = 0;
- advanceToValidCallee();
- }
-
- // End iterator ctor...
- CallSiteIterator(std::vector<DSCallSite> &CS, bool) : FCs(&CS) {
- CallSite = FCs->size(); CallSiteEntry = 0;
- }
-
- void advanceToValidCallee() {
- while (CallSite < FCs->size()) {
- if ((*FCs)[CallSite].isDirectCall()) {
- if (CallSiteEntry == 0 && // direct call only has one target...
- (!(*FCs)[CallSite].getCalleeFunc()->isExternal() ||
- isVAHackFn((*FCs)[CallSite].getCalleeFunc()))) // If not external
- return;
- } else {
- DSNode *CalleeNode = (*FCs)[CallSite].getCalleeNode();
- if (CallSiteEntry || isCompleteNode(CalleeNode)) {
- const std::vector<GlobalValue*> &Callees = CalleeNode->getGlobals();
-
- if (CallSiteEntry < Callees.size())
- return;
- }
- }
- CallSiteEntry = 0;
- ++CallSite;
+/// BuildGlobalECs - Look at all of the nodes in the globals graph. If any node
+/// contains multiple globals, DSA will never, ever, be able to tell the globals
+/// apart. Instead of maintaining this information in all of the graphs
+/// throughout the entire program, store only a single global (the "leader") in
+/// the graphs, and build equivalence classes for the rest of the globals.
+static void BuildGlobalECs(DSGraph &GG, std::set<GlobalValue*> &ECGlobals) {
+ DSScalarMap &SM = GG.getScalarMap();
+ EquivalenceClasses<GlobalValue*> &GlobalECs = SM.getGlobalECs();
+ for (DSGraph::node_iterator I = GG.node_begin(), E = GG.node_end();
+ I != E; ++I) {
+ if (I->getGlobalsList().size() <= 1) continue;
+
+ // First, build up the equivalence set for this block of globals.
+ const std::vector<GlobalValue*> &GVs = I->getGlobalsList();
+ GlobalValue *First = GVs[0];
+ for (unsigned i = 1, e = GVs.size(); i != e; ++i)
+ GlobalECs.unionSets(First, GVs[i]);
+
+ // Next, get the leader element.
+ assert(First == GlobalECs.getLeaderValue(First) &&
+ "First did not end up being the leader?");
+
+ // Next, remove all globals from the scalar map that are not the leader.
+ assert(GVs[0] == First && "First had to be at the front!");
+ for (unsigned i = 1, e = GVs.size(); i != e; ++i) {
+ ECGlobals.insert(GVs[i]);
+ SM.erase(SM.find(GVs[i]));
}
+
+ // Finally, change the global node to only contain the leader.
+ I->clearGlobals();
+ I->addGlobal(First);
}
-public:
- static CallSiteIterator begin(DSGraph &G) { return G.getAuxFunctionCalls(); }
- static CallSiteIterator end(DSGraph &G) {
- return CallSiteIterator(G.getAuxFunctionCalls(), true);
- }
- static CallSiteIterator begin(std::vector<DSCallSite> &CSs) { return CSs; }
- static CallSiteIterator end(std::vector<DSCallSite> &CSs) {
- return CallSiteIterator(CSs, true);
- }
- bool operator==(const CallSiteIterator &CSI) const {
- return CallSite == CSI.CallSite && CallSiteEntry == CSI.CallSiteEntry;
- }
- bool operator!=(const CallSiteIterator &CSI) const { return !operator==(CSI);}
- unsigned getCallSiteIdx() const { return CallSite; }
- DSCallSite &getCallSite() const { return (*FCs)[CallSite]; }
+ DEBUG(GG.AssertGraphOK());
+}
- Function *operator*() const {
- if ((*FCs)[CallSite].isDirectCall()) {
- return (*FCs)[CallSite].getCalleeFunc();
+/// EliminateUsesOfECGlobals - Once we have determined that some globals are in
+/// really just equivalent to some other globals, remove the globals from the
+/// specified DSGraph (if present), and merge any nodes with their leader nodes.
+static void EliminateUsesOfECGlobals(DSGraph &G,
+ const std::set<GlobalValue*> &ECGlobals) {
+ DSScalarMap &SM = G.getScalarMap();
+ EquivalenceClasses<GlobalValue*> &GlobalECs = SM.getGlobalECs();
+
+ bool MadeChange = false;
+ for (DSScalarMap::global_iterator GI = SM.global_begin(), E = SM.global_end();
+ GI != E; ) {
+ GlobalValue *GV = *GI++;
+ if (!ECGlobals.count(GV)) continue;
+
+ const DSNodeHandle &GVNH = SM[GV];
+ assert(!GVNH.isNull() && "Global has null NH!?");
+
+ // Okay, this global is in some equivalence class. Start by finding the
+ // leader of the class.
+ GlobalValue *Leader = GlobalECs.getLeaderValue(GV);
+
+ // If the leader isn't already in the graph, insert it into the node
+ // corresponding to GV.
+ if (!SM.global_count(Leader)) {
+ GVNH.getNode()->addGlobal(Leader);
+ SM[Leader] = GVNH;
} else {
- DSNode *Node = (*FCs)[CallSite].getCalleeNode();
- return cast<Function>(Node->getGlobals()[CallSiteEntry]);
+ // Otherwise, the leader is in the graph, make sure the nodes are the
+ // merged in the specified graph.
+ const DSNodeHandle &LNH = SM[Leader];
+ if (LNH.getNode() != GVNH.getNode())
+ LNH.mergeWith(GVNH);
}
- }
- CallSiteIterator& operator++() { // Preincrement
- ++CallSiteEntry;
- advanceToValidCallee();
- return *this;
- }
- CallSiteIterator operator++(int) { // Postincrement
- CallSiteIterator tmp = *this; ++*this; return tmp;
- }
-};
+ // Next step, remove the global from the DSNode.
+ GVNH.getNode()->removeGlobal(GV);
+ // Finally, remove the global from the ScalarMap.
+ SM.erase(GV);
+ MadeChange = true;
+ }
+ DEBUG(if(MadeChange) G.AssertGraphOK());
+}
// run - Calculate the bottom up data structure graphs for each function in the
// program.
//
-bool BUDataStructures::run(Module &M) {
+bool BUDataStructures::runOnModule(Module &M) {
LocalDataStructures &LocalDSA = getAnalysis<LocalDataStructures>();
- GlobalsGraph = new DSGraph(LocalDSA.getGlobalsGraph());
+ GlobalECs = LocalDSA.getGlobalECs();
+
+ GlobalsGraph = new DSGraph(LocalDSA.getGlobalsGraph(), GlobalECs);
GlobalsGraph->setPrintAuxCalls();
+ IndCallGraphMap = new std::map<std::vector<Function*>,
+ std::pair<DSGraph*, std::vector<DSNodeHandle> > >();
+
+ std::vector<Function*> Stack;
+ hash_map<Function*, unsigned> ValMap;
+ unsigned NextID = 1;
+
Function *MainFunc = M.getMainFunction();
if (MainFunc)
- calculateReachableGraphs(MainFunc);
+ calculateGraphs(MainFunc, Stack, NextID, ValMap);
// Calculate the graphs for any functions that are unreachable from main...
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (!I->isExternal() && DSInfo.find(I) == DSInfo.end()) {
+ if (!I->isExternal() && !DSInfo.count(I)) {
#ifndef NDEBUG
if (MainFunc)
std::cerr << "*** Function unreachable from main: "
<< I->getName() << "\n";
#endif
- calculateReachableGraphs(I); // Calculate all graphs...
+ calculateGraphs(I, Stack, NextID, ValMap); // Calculate all graphs.
}
- return false;
-}
-void BUDataStructures::calculateReachableGraphs(Function *F) {
- std::vector<Function*> Stack;
- hash_map<Function*, unsigned> ValMap;
- unsigned NextID = 1;
- calculateGraphs(F, Stack, NextID, ValMap);
+ NumCallEdges += ActualCallees.size();
+
+ // If we computed any temporary indcallgraphs, free them now.
+ for (std::map<std::vector<Function*>,
+ std::pair<DSGraph*, std::vector<DSNodeHandle> > >::iterator I =
+ IndCallGraphMap->begin(), E = IndCallGraphMap->end(); I != E; ++I) {
+ I->second.second.clear(); // Drop arg refs into the graph.
+ delete I->second.first;
+ }
+ delete IndCallGraphMap;
+
+ // At the end of the bottom-up pass, the globals graph becomes complete.
+ // FIXME: This is not the right way to do this, but it is sorta better than
+ // nothing! In particular, externally visible globals and unresolvable call
+ // nodes at the end of the BU phase should make things that they point to
+ // incomplete in the globals graph.
+ //
+ GlobalsGraph->removeTriviallyDeadNodes();
+ GlobalsGraph->maskIncompleteMarkers();
+
+ // Mark external globals incomplete.
+ GlobalsGraph->markIncompleteNodes(DSGraph::IgnoreGlobals);
+
+ // Grow the equivalence classes for the globals to include anything that we
+ // now know to be aliased.
+ std::set<GlobalValue*> ECGlobals;
+ BuildGlobalECs(*GlobalsGraph, ECGlobals);
+ if (!ECGlobals.empty()) {
+ NamedRegionTimer X("Bottom-UP EC Cleanup");
+ std::cerr << "Eliminating " << ECGlobals.size() << " EC Globals!\n";
+ for (hash_map<Function*, DSGraph*>::iterator I = DSInfo.begin(),
+ E = DSInfo.end(); I != E; ++I)
+ EliminateUsesOfECGlobals(*I->second, ECGlobals);
+ }
+
+ // Merge the globals variables (not the calls) from the globals graph back
+ // into the main function's graph so that the main function contains all of
+ // the information about global pools and GV usage in the program.
+ if (MainFunc && !MainFunc->isExternal()) {
+ DSGraph &MainGraph = getOrCreateGraph(MainFunc);
+ const DSGraph &GG = *MainGraph.getGlobalsGraph();
+ ReachabilityCloner RC(MainGraph, GG,
+ DSGraph::DontCloneCallNodes |
+ DSGraph::DontCloneAuxCallNodes);
+
+ // Clone the global nodes into this graph.
+ for (DSScalarMap::global_iterator I = GG.getScalarMap().global_begin(),
+ E = GG.getScalarMap().global_end(); I != E; ++I)
+ if (isa<GlobalVariable>(*I))
+ RC.getClonedNH(GG.getNodeForValue(*I));
+
+ MainGraph.maskIncompleteMarkers();
+ MainGraph.markIncompleteNodes(DSGraph::MarkFormalArgs |
+ DSGraph::IgnoreGlobals);
+ }
+
+ return false;
}
DSGraph &BUDataStructures::getOrCreateGraph(Function *F) {
DSGraph *&Graph = DSInfo[F];
if (Graph) return *Graph;
- // Copy the local version into DSInfo...
- Graph = new DSGraph(getAnalysis<LocalDataStructures>().getDSGraph(*F));
+ DSGraph &LocGraph = getAnalysis<LocalDataStructures>().getDSGraph(*F);
+
+ // Steal the local graph.
+ Graph = new DSGraph(GlobalECs, LocGraph.getTargetData());
+ Graph->spliceFrom(LocGraph);
Graph->setGlobalsGraph(GlobalsGraph);
Graph->setPrintAuxCalls();
return *Graph;
}
+static bool isVAHackFn(const Function *F) {
+ return F->getName() == "printf" || F->getName() == "sscanf" ||
+ F->getName() == "fprintf" || F->getName() == "open" ||
+ F->getName() == "sprintf" || F->getName() == "fputs" ||
+ F->getName() == "fscanf" || F->getName() == "malloc" ||
+ F->getName() == "free";
+}
+
+static bool isResolvableFunc(const Function* callee) {
+ return !callee->isExternal() || isVAHackFn(callee);
+}
+
+static void GetAllCallees(const DSCallSite &CS,
+ std::vector<Function*> &Callees) {
+ if (CS.isDirectCall()) {
+ if (isResolvableFunc(CS.getCalleeFunc()))
+ Callees.push_back(CS.getCalleeFunc());
+ } else if (!CS.getCalleeNode()->isIncomplete()) {
+ // Get all callees.
+ unsigned OldSize = Callees.size();
+ CS.getCalleeNode()->addFullFunctionList(Callees);
+
+ // If any of the callees are unresolvable, remove the whole batch!
+ for (unsigned i = OldSize, e = Callees.size(); i != e; ++i)
+ if (!isResolvableFunc(Callees[i])) {
+ Callees.erase(Callees.begin()+OldSize, Callees.end());
+ return;
+ }
+ }
+}
+
+
+/// GetAllAuxCallees - Return a list containing all of the resolvable callees in
+/// the aux list for the specified graph in the Callees vector.
+static void GetAllAuxCallees(DSGraph &G, std::vector<Function*> &Callees) {
+ Callees.clear();
+ for (DSGraph::afc_iterator I = G.afc_begin(), E = G.afc_end(); I != E; ++I)
+ GetAllCallees(*I, Callees);
+}
+
unsigned BUDataStructures::calculateGraphs(Function *F,
std::vector<Function*> &Stack,
- unsigned &NextID,
+ unsigned &NextID,
hash_map<Function*, unsigned> &ValMap) {
- assert(ValMap.find(F) == ValMap.end() && "Shouldn't revisit functions!");
+ assert(!ValMap.count(F) && "Shouldn't revisit functions!");
unsigned Min = NextID++, MyID = Min;
ValMap[F] = Min;
Stack.push_back(F);
+ // FIXME! This test should be generalized to be any function that we have
+ // already processed, in the case when there isn't a main or there are
+ // unreachable functions!
if (F->isExternal()) { // sprintf, fprintf, sscanf, etc...
// No callees!
Stack.pop_back();
DSGraph &Graph = getOrCreateGraph(F);
+ // Find all callee functions.
+ std::vector<Function*> CalleeFunctions;
+ GetAllAuxCallees(Graph, CalleeFunctions);
+
// The edges out of the current node are the call site targets...
- for (CallSiteIterator I = CallSiteIterator::begin(Graph),
- E = CallSiteIterator::end(Graph); I != E; ++I) {
- Function *Callee = *I;
+ for (unsigned i = 0, e = CalleeFunctions.size(); i != e; ++i) {
+ Function *Callee = CalleeFunctions[i];
unsigned M;
// Have we visited the destination function yet?
hash_map<Function*, unsigned>::iterator It = ValMap.find(Callee);
DEBUG(std::cerr << "Visiting single node SCC #: " << MyID << " fn: "
<< F->getName() << "\n");
Stack.pop_back();
- DSGraph &G = calculateGraph(*F);
+ DSGraph &G = getDSGraph(*F);
+ DEBUG(std::cerr << " [BU] Calculating graph for: " << F->getName()<< "\n");
+ calculateGraph(G);
+ DEBUG(std::cerr << " [BU] Done inlining: " << F->getName() << " ["
+ << G.getGraphSize() << "+" << G.getAuxFunctionCalls().size()
+ << "]\n");
if (MaxSCC < 1) MaxSCC = 1;
- // Should we revisit the graph?
- if (CallSiteIterator::begin(G) != CallSiteIterator::end(G)) {
+ // Should we revisit the graph? Only do it if there are now new resolvable
+ // callees.
+ GetAllAuxCallees(Graph, CalleeFunctions);
+ if (!CalleeFunctions.empty()) {
ValMap.erase(F);
return calculateGraphs(F, Stack, NextID, ValMap);
} else {
} else {
// SCCFunctions - Keep track of the functions in the current SCC
//
- hash_set<Function*> SCCFunctions;
+ std::vector<DSGraph*> SCCGraphs;
- Function *NF;
- std::vector<Function*>::iterator FirstInSCC = Stack.end();
- do {
- NF = *--FirstInSCC;
+ unsigned SCCSize = 1;
+ Function *NF = Stack.back();
+ ValMap[NF] = ~0U;
+ DSGraph &SCCGraph = getDSGraph(*NF);
+
+ // First thing first, collapse all of the DSGraphs into a single graph for
+ // the entire SCC. Splice all of the graphs into one and discard all of the
+ // old graphs.
+ //
+ while (NF != F) {
+ Stack.pop_back();
+ NF = Stack.back();
ValMap[NF] = ~0U;
- SCCFunctions.insert(NF);
- } while (NF != F);
- std::cerr << "Identified SCC #: " << MyID << " of size: "
- << (Stack.end()-FirstInSCC) << "\n";
+ DSGraph &NFG = getDSGraph(*NF);
- // Compute the Max SCC Size...
- if (MaxSCC < unsigned(Stack.end()-FirstInSCC))
- MaxSCC = Stack.end()-FirstInSCC;
+ // Update the Function -> DSG map.
+ for (DSGraph::retnodes_iterator I = NFG.retnodes_begin(),
+ E = NFG.retnodes_end(); I != E; ++I)
+ DSInfo[I->first] = &SCCGraph;
- std::vector<Function*>::iterator I = Stack.end();
- do {
- --I;
-#ifndef NDEBUG
- /*DEBUG*/(std::cerr << " Fn #" << (Stack.end()-I) << "/"
- << (Stack.end()-FirstInSCC) << " in SCC: "
- << (*I)->getName());
- DSGraph &G = getDSGraph(**I);
- std::cerr << " [" << G.getGraphSize() << "+"
- << G.getAuxFunctionCalls().size() << "] ";
-#endif
+ SCCGraph.spliceFrom(NFG);
+ delete &NFG;
- // Eliminate all call sites in the SCC that are not to functions that are
- // in the SCC.
- inlineNonSCCGraphs(**I, SCCFunctions);
+ ++SCCSize;
+ }
+ Stack.pop_back();
-#ifndef NDEBUG
- std::cerr << "after Non-SCC's [" << G.getGraphSize() << "+"
- << G.getAuxFunctionCalls().size() << "]\n";
-#endif
- } while (I != FirstInSCC);
+ std::cerr << "Calculating graph for SCC #: " << MyID << " of size: "
+ << SCCSize << "\n";
- I = Stack.end();
- do {
- --I;
-#ifndef NDEBUG
- /*DEBUG*/(std::cerr << " Fn #" << (Stack.end()-I) << "/"
- << (Stack.end()-FirstInSCC) << " in SCC: "
- << (*I)->getName());
- DSGraph &G = getDSGraph(**I);
- std::cerr << " [" << G.getGraphSize() << "+"
- << G.getAuxFunctionCalls().size() << "] ";
-#endif
- // Inline all graphs into the SCC nodes...
- calculateSCCGraph(**I, SCCFunctions);
+ // Compute the Max SCC Size.
+ if (MaxSCC < SCCSize)
+ MaxSCC = SCCSize;
-#ifndef NDEBUG
- std::cerr << "after [" << G.getGraphSize() << "+"
- << G.getAuxFunctionCalls().size() << "]\n";
-#endif
- } while (I != FirstInSCC);
+ // Clean up the graph before we start inlining a bunch again...
+ SCCGraph.removeDeadNodes(DSGraph::KeepUnreachableGlobals);
+ // Now that we have one big happy family, resolve all of the call sites in
+ // the graph...
+ calculateGraph(SCCGraph);
+ DEBUG(std::cerr << " [BU] Done inlining SCC [" << SCCGraph.getGraphSize()
+ << "+" << SCCGraph.getAuxFunctionCalls().size() << "]\n");
std::cerr << "DONE with SCC #: " << MyID << "\n";
// We never have to revisit "SCC" processed functions...
-
- // Drop the stuff we don't need from the end of the stack
- Stack.erase(FirstInSCC, Stack.end());
return MyID;
}
// releaseMemory - If the pass pipeline is done with this pass, we can release
// our memory... here...
//
-void BUDataStructures::releaseMemory() {
- for (hash_map<const Function*, DSGraph*>::iterator I = DSInfo.begin(),
- E = DSInfo.end(); I != E; ++I)
- delete I->second;
+void BUDataStructures::releaseMyMemory() {
+ for (hash_map<Function*, DSGraph*>::iterator I = DSInfo.begin(),
+ E = DSInfo.end(); I != E; ++I) {
+ I->second->getReturnNodes().erase(I->first);
+ if (I->second->getReturnNodes().empty())
+ delete I->second;
+ }
// Empty map so next time memory is released, data structures are not
// re-deleted.
GlobalsGraph = 0;
}
-DSGraph &BUDataStructures::calculateGraph(Function &F) {
- DSGraph &Graph = getDSGraph(F);
- DEBUG(std::cerr << " [BU] Calculating graph for: " << F.getName() << "\n");
+DSGraph &BUDataStructures::CreateGraphForExternalFunction(const Function &Fn) {
+ Function *F = const_cast<Function*>(&Fn);
+ DSGraph *DSG = new DSGraph(GlobalECs, GlobalsGraph->getTargetData());
+ DSInfo[F] = DSG;
+ DSG->setGlobalsGraph(GlobalsGraph);
+ DSG->setPrintAuxCalls();
+
+ // Add function to the graph.
+ DSG->getReturnNodes().insert(std::make_pair(F, DSNodeHandle()));
+
+ if (F->getName() == "free") { // Taking the address of free.
+
+ // Free should take a single pointer argument, mark it as heap memory.
+ DSNode *N = new DSNode(0, DSG);
+ N->setHeapNodeMarker();
+ DSG->getNodeForValue(F->arg_begin()).mergeWith(N);
+
+ } else {
+ std::cerr << "Unrecognized external function: " << F->getName() << "\n";
+ abort();
+ }
+
+ return *DSG;
+}
+
+void BUDataStructures::calculateGraph(DSGraph &Graph) {
// Move our call site list into TempFCs so that inline call sites go into the
// new call site list and doesn't invalidate our iterators!
- std::vector<DSCallSite> TempFCs;
- std::vector<DSCallSite> &AuxCallsList = Graph.getAuxFunctionCalls();
+ std::list<DSCallSite> TempFCs;
+ std::list<DSCallSite> &AuxCallsList = Graph.getAuxFunctionCalls();
TempFCs.swap(AuxCallsList);
- // Loop over all of the resolvable call sites
- unsigned LastCallSiteIdx = ~0U;
- for (CallSiteIterator I = CallSiteIterator::begin(TempFCs),
- E = CallSiteIterator::end(TempFCs); I != E; ++I) {
- // If we skipped over any call sites, they must be unresolvable, copy them
- // to the real call site list.
- LastCallSiteIdx++;
- for (; LastCallSiteIdx < I.getCallSiteIdx(); ++LastCallSiteIdx)
- AuxCallsList.push_back(TempFCs[LastCallSiteIdx]);
- LastCallSiteIdx = I.getCallSiteIdx();
-
- // Resolve the current call...
- Function *Callee = *I;
- DSCallSite &CS = I.getCallSite();
+ DSGraph::ReturnNodesTy &ReturnNodes = Graph.getReturnNodes();
- if (Callee->isExternal()) {
- // Ignore this case, simple varargs functions we cannot stub out!
- } else if (Callee == &F) {
- // Self recursion... simply link up the formal arguments with the
- // actual arguments...
- DEBUG(std::cerr << " Self Inlining: " << F.getName() << "\n");
+ bool Printed = false;
+ std::vector<Function*> CalledFuncs;
+ while (!TempFCs.empty()) {
+ DSCallSite &CS = *TempFCs.begin();
- // Handle self recursion by resolving the arguments and return value
- Graph.mergeInGraph(CS, F, Graph, 0);
+ CalledFuncs.clear();
- } else {
- // Get the data structure graph for the called function.
- //
- DSGraph &GI = getDSGraph(*Callee); // Graph to inline
-
- DEBUG(std::cerr << " Inlining graph for " << Callee->getName()
- << "[" << GI.getGraphSize() << "+"
- << GI.getAuxFunctionCalls().size() << "] into: " << F.getName()
- << "[" << Graph.getGraphSize() << "+"
- << Graph.getAuxFunctionCalls().size() << "]\n");
-#if 0
- Graph.writeGraphToFile(std::cerr, "bu_" + F.getName() + "_before_" +
- Callee->getName());
-#endif
-
- // Handle self recursion by resolving the arguments and return value
- Graph.mergeInGraph(CS, *Callee, GI,
- DSGraph::KeepModRefBits |
- DSGraph::StripAllocaBit | DSGraph::DontCloneCallNodes);
-
-#if 0
- Graph.writeGraphToFile(std::cerr, "bu_" + F.getName() + "_after_" +
- Callee->getName());
-#endif
+ // Fast path for noop calls. Note that we don't care about merging globals
+ // in the callee with nodes in the caller here.
+ if (CS.getRetVal().isNull() && CS.getNumPtrArgs() == 0) {
+ TempFCs.erase(TempFCs.begin());
+ continue;
+ } else if (CS.isDirectCall() && isVAHackFn(CS.getCalleeFunc())) {
+ TempFCs.erase(TempFCs.begin());
+ continue;
}
- }
-
- // Make sure to catch any leftover unresolvable calls...
- for (++LastCallSiteIdx; LastCallSiteIdx < TempFCs.size(); ++LastCallSiteIdx)
- AuxCallsList.push_back(TempFCs[LastCallSiteIdx]);
- TempFCs.clear();
+ GetAllCallees(CS, CalledFuncs);
- // Recompute the Incomplete markers. If there are any function calls left
- // now that are complete, we must loop!
- Graph.maskIncompleteMarkers();
- Graph.markIncompleteNodes(DSGraph::MarkFormalArgs);
- // FIXME: materialize nodes from the globals graph as neccesary...
- Graph.removeDeadNodes(DSGraph::KeepUnreachableGlobals);
+ if (CalledFuncs.empty()) {
+ // Remember that we could not resolve this yet!
+ AuxCallsList.splice(AuxCallsList.end(), TempFCs, TempFCs.begin());
+ continue;
+ } else {
+ DSGraph *GI;
+ Instruction *TheCall = CS.getCallSite().getInstruction();
- DEBUG(std::cerr << " [BU] Done inlining: " << F.getName() << " ["
- << Graph.getGraphSize() << "+" << Graph.getAuxFunctionCalls().size()
- << "]\n");
+ if (CalledFuncs.size() == 1) {
+ Function *Callee = CalledFuncs[0];
+ ActualCallees.insert(std::make_pair(TheCall, Callee));
- //Graph.writeGraphToFile(std::cerr, "bu_" + F.getName());
+ // Get the data structure graph for the called function.
+ GI = &getDSGraph(*Callee); // Graph to inline
+ DEBUG(std::cerr << " Inlining graph for " << Callee->getName());
- return Graph;
-}
+ DEBUG(std::cerr << "[" << GI->getGraphSize() << "+"
+ << GI->getAuxFunctionCalls().size() << "] into '"
+ << Graph.getFunctionNames() << "' [" << Graph.getGraphSize() <<"+"
+ << Graph.getAuxFunctionCalls().size() << "]\n");
+ Graph.mergeInGraph(CS, *Callee, *GI,
+ DSGraph::StripAllocaBit|DSGraph::DontCloneCallNodes);
+ ++NumBUInlines;
+ } else {
+ if (!Printed)
+ std::cerr << "In Fns: " << Graph.getFunctionNames() << "\n";
+ std::cerr << " calls " << CalledFuncs.size()
+ << " fns from site: " << CS.getCallSite().getInstruction()
+ << " " << *CS.getCallSite().getInstruction();
+ std::cerr << " Fns =";
+ unsigned NumPrinted = 0;
+
+ for (std::vector<Function*>::iterator I = CalledFuncs.begin(),
+ E = CalledFuncs.end(); I != E; ++I) {
+ if (NumPrinted++ < 8) std::cerr << " " << (*I)->getName();
+
+ // Add the call edges to the call graph.
+ ActualCallees.insert(std::make_pair(TheCall, *I));
+ }
+ std::cerr << "\n";
+
+ // See if we already computed a graph for this set of callees.
+ std::sort(CalledFuncs.begin(), CalledFuncs.end());
+ std::pair<DSGraph*, std::vector<DSNodeHandle> > &IndCallGraph =
+ (*IndCallGraphMap)[CalledFuncs];
+
+ if (IndCallGraph.first == 0) {
+ std::vector<Function*>::iterator I = CalledFuncs.begin(),
+ E = CalledFuncs.end();
+
+ // Start with a copy of the first graph.
+ GI = IndCallGraph.first = new DSGraph(getDSGraph(**I), GlobalECs);
+ GI->setGlobalsGraph(Graph.getGlobalsGraph());
+ std::vector<DSNodeHandle> &Args = IndCallGraph.second;
+
+ // Get the argument nodes for the first callee. The return value is
+ // the 0th index in the vector.
+ GI->getFunctionArgumentsForCall(*I, Args);
+
+ // Merge all of the other callees into this graph.
+ for (++I; I != E; ++I) {
+ // If the graph already contains the nodes for the function, don't
+ // bother merging it in again.
+ if (!GI->containsFunction(*I)) {
+ GI->cloneInto(getDSGraph(**I));
+ ++NumBUInlines;
+ }
+
+ std::vector<DSNodeHandle> NextArgs;
+ GI->getFunctionArgumentsForCall(*I, NextArgs);
+ unsigned i = 0, e = Args.size();
+ for (; i != e; ++i) {
+ if (i == NextArgs.size()) break;
+ Args[i].mergeWith(NextArgs[i]);
+ }
+ for (e = NextArgs.size(); i != e; ++i)
+ Args.push_back(NextArgs[i]);
+ }
+
+ // Clean up the final graph!
+ GI->removeDeadNodes(DSGraph::KeepUnreachableGlobals);
+ } else {
+ std::cerr << "***\n*** RECYCLED GRAPH ***\n***\n";
+ }
+ GI = IndCallGraph.first;
-// inlineNonSCCGraphs - This method is almost like the other two calculate graph
-// methods. This one is used to inline function graphs (from functions outside
-// of the SCC) into functions in the SCC. It is not supposed to touch functions
-// IN the SCC at all.
-//
-DSGraph &BUDataStructures::inlineNonSCCGraphs(Function &F,
- hash_set<Function*> &SCCFunctions){
- DSGraph &Graph = getDSGraph(F);
- DEBUG(std::cerr << " [BU] Inlining Non-SCC graphs for: "
- << F.getName() << "\n");
-
- // Move our call site list into TempFCs so that inline call sites go into the
- // new call site list and doesn't invalidate our iterators!
- std::vector<DSCallSite> TempFCs;
- std::vector<DSCallSite> &AuxCallsList = Graph.getAuxFunctionCalls();
- TempFCs.swap(AuxCallsList);
+ // Merge the unified graph into this graph now.
+ DEBUG(std::cerr << " Inlining multi callee graph "
+ << "[" << GI->getGraphSize() << "+"
+ << GI->getAuxFunctionCalls().size() << "] into '"
+ << Graph.getFunctionNames() << "' [" << Graph.getGraphSize() <<"+"
+ << Graph.getAuxFunctionCalls().size() << "]\n");
- // Loop over all of the resolvable call sites
- unsigned LastCallSiteIdx = ~0U;
- for (CallSiteIterator I = CallSiteIterator::begin(TempFCs),
- E = CallSiteIterator::end(TempFCs); I != E; ++I) {
- // If we skipped over any call sites, they must be unresolvable, copy them
- // to the real call site list.
- LastCallSiteIdx++;
- for (; LastCallSiteIdx < I.getCallSiteIdx(); ++LastCallSiteIdx)
- AuxCallsList.push_back(TempFCs[LastCallSiteIdx]);
- LastCallSiteIdx = I.getCallSiteIdx();
-
- // Resolve the current call...
- Function &Callee = **I;
- DSCallSite &CS = I.getCallSite();
-
- if (Callee.isExternal()) {
- // Ignore this case, simple varargs functions we cannot stub out!
- } else if (SCCFunctions.count(&Callee)) {
- // Calling a function in the SCC, ignore it for now!
- DEBUG(std::cerr << " SCC CallSite for: " << Callee.getName() << "\n");
- AuxCallsList.push_back(CS);
- } else {
- // Get the data structure graph for the called function.
- //
- DSGraph &GI = getDSGraph(Callee); // Graph to inline
-
- DEBUG(std::cerr << " Inlining graph for " << Callee.getName()
- << "[" << GI.getGraphSize() << "+"
- << GI.getAuxFunctionCalls().size() << "] into: " << F.getName()
- << "[" << Graph.getGraphSize() << "+"
- << Graph.getAuxFunctionCalls().size() << "]\n");
-
- // Handle self recursion by resolving the arguments and return value
- Graph.mergeInGraph(CS, Callee, GI,
- DSGraph::KeepModRefBits | DSGraph::StripAllocaBit |
- DSGraph::DontCloneCallNodes);
+ Graph.mergeInGraph(CS, IndCallGraph.second, *GI,
+ DSGraph::StripAllocaBit |
+ DSGraph::DontCloneCallNodes);
+ ++NumBUInlines;
+ }
}
+ TempFCs.erase(TempFCs.begin());
}
- // Make sure to catch any leftover unresolvable calls...
- for (++LastCallSiteIdx; LastCallSiteIdx < TempFCs.size(); ++LastCallSiteIdx)
- AuxCallsList.push_back(TempFCs[LastCallSiteIdx]);
-
- TempFCs.clear();
-
- // Recompute the Incomplete markers. If there are any function calls left
- // now that are complete, we must loop!
+ // Recompute the Incomplete markers
Graph.maskIncompleteMarkers();
Graph.markIncompleteNodes(DSGraph::MarkFormalArgs);
+
+ // Delete dead nodes. Treat globals that are unreachable but that can
+ // reach live nodes as live.
Graph.removeDeadNodes(DSGraph::KeepUnreachableGlobals);
- DEBUG(std::cerr << " [BU] Done Non-SCC inlining: " << F.getName() << " ["
- << Graph.getGraphSize() << "+" << Graph.getAuxFunctionCalls().size()
- << "]\n");
- //Graph.writeGraphToFile(std::cerr, "nscc_" + F.getName());
- return Graph;
-}
+ // When this graph is finalized, clone the globals in the graph into the
+ // globals graph to make sure it has everything, from all graphs.
+ DSScalarMap &MainSM = Graph.getScalarMap();
+ ReachabilityCloner RC(*GlobalsGraph, Graph, DSGraph::StripAllocaBit);
+ // Clone everything reachable from globals in the function graph into the
+ // globals graph.
+ for (DSScalarMap::global_iterator I = MainSM.global_begin(),
+ E = MainSM.global_end(); I != E; ++I)
+ RC.getClonedNH(MainSM[*I]);
-DSGraph &BUDataStructures::calculateSCCGraph(Function &F,
- hash_set<Function*> &SCCFunctions){
- DSGraph &Graph = getDSGraph(F);
- DEBUG(std::cerr << " [BU] Calculating SCC graph for: " << F.getName()<<"\n");
-
- std::vector<DSCallSite> UnresolvableCalls;
- hash_map<Function*, DSCallSite> SCCCallSiteMap;
- std::vector<DSCallSite> &AuxCallsList = Graph.getAuxFunctionCalls();
-
- while (1) { // Loop until we run out of resolvable call sites!
- // Move our call site list into TempFCs so that inline call sites go into
- // the new call site list and doesn't invalidate our iterators!
- std::vector<DSCallSite> TempFCs;
- TempFCs.swap(AuxCallsList);
-
- // Loop over all of the resolvable call sites
- unsigned LastCallSiteIdx = ~0U;
- CallSiteIterator I = CallSiteIterator::begin(TempFCs),
- E = CallSiteIterator::end(TempFCs);
- if (I == E) {
- TempFCs.swap(AuxCallsList);
- break; // Done when no resolvable call sites exist
- }
+ //Graph.writeGraphToFile(std::cerr, "bu_" + F.getName());
+}
- for (; I != E; ++I) {
- // If we skipped over any call sites, they must be unresolvable, copy them
- // to the unresolvable site list.
- LastCallSiteIdx++;
- for (; LastCallSiteIdx < I.getCallSiteIdx(); ++LastCallSiteIdx)
- UnresolvableCalls.push_back(TempFCs[LastCallSiteIdx]);
- LastCallSiteIdx = I.getCallSiteIdx();
-
- // Resolve the current call...
- Function *Callee = *I;
- DSCallSite &CS = I.getCallSite();
-
- if (Callee->isExternal()) {
- // Ignore this case, simple varargs functions we cannot stub out!
- } else if (Callee == &F) {
- // Self recursion... simply link up the formal arguments with the
- // actual arguments...
- DEBUG(std::cerr << " Self Inlining: " << F.getName() << "\n");
-
- // Handle self recursion by resolving the arguments and return value
- Graph.mergeInGraph(CS, *Callee, Graph, 0);
- } else if (SCCCallSiteMap.count(Callee)) {
- // We have already seen a call site in the SCC for this function, just
- // merge the two call sites together and we are done.
- SCCCallSiteMap.find(Callee)->second.mergeWith(CS);
- } else {
- // Get the data structure graph for the called function.
- //
- DSGraph &GI = getDSGraph(*Callee); // Graph to inline
- DEBUG(std::cerr << " Inlining graph for " << Callee->getName()
- << "[" << GI.getGraphSize() << "+"
- << GI.getAuxFunctionCalls().size() << "] into: " << F.getName()
- << "[" << Graph.getGraphSize() << "+"
- << Graph.getAuxFunctionCalls().size() << "]\n");
-
- // Handle self recursion by resolving the arguments and return value
- Graph.mergeInGraph(CS, *Callee, GI,
- DSGraph::KeepModRefBits | DSGraph::StripAllocaBit |
- DSGraph::DontCloneCallNodes);
+static const Function *getFnForValue(const Value *V) {
+ if (const Instruction *I = dyn_cast<Instruction>(V))
+ return I->getParent()->getParent();
+ else if (const Argument *A = dyn_cast<Argument>(V))
+ return A->getParent();
+ else if (const BasicBlock *BB = dyn_cast<BasicBlock>(V))
+ return BB->getParent();
+ return 0;
+}
- if (SCCFunctions.count(Callee))
- SCCCallSiteMap.insert(std::make_pair(Callee, CS));
- }
- }
-
- // Make sure to catch any leftover unresolvable calls...
- for (++LastCallSiteIdx; LastCallSiteIdx < TempFCs.size(); ++LastCallSiteIdx)
- UnresolvableCalls.push_back(TempFCs[LastCallSiteIdx]);
+/// deleteValue/copyValue - Interfaces to update the DSGraphs in the program.
+/// These correspond to the interfaces defined in the AliasAnalysis class.
+void BUDataStructures::deleteValue(Value *V) {
+ if (const Function *F = getFnForValue(V)) { // Function local value?
+ // If this is a function local value, just delete it from the scalar map!
+ getDSGraph(*F).getScalarMap().eraseIfExists(V);
+ return;
}
- // Reset the SCCCallSiteMap...
- SCCCallSiteMap.clear();
-
- AuxCallsList.insert(AuxCallsList.end(), UnresolvableCalls.begin(),
- UnresolvableCalls.end());
- UnresolvableCalls.clear();
+ if (Function *F = dyn_cast<Function>(V)) {
+ assert(getDSGraph(*F).getReturnNodes().size() == 1 &&
+ "cannot handle scc's");
+ delete DSInfo[F];
+ DSInfo.erase(F);
+ return;
+ }
+ assert(!isa<GlobalVariable>(V) && "Do not know how to delete GV's yet!");
+}
- // Recompute the Incomplete markers. If there are any function calls left
- // now that are complete, we must loop!
- Graph.maskIncompleteMarkers();
- Graph.markIncompleteNodes(DSGraph::MarkFormalArgs);
+void BUDataStructures::copyValue(Value *From, Value *To) {
+ if (From == To) return;
+ if (const Function *F = getFnForValue(From)) { // Function local value?
+ // If this is a function local value, just delete it from the scalar map!
+ getDSGraph(*F).getScalarMap().copyScalarIfExists(From, To);
+ return;
+ }
- // FIXME: materialize nodes from the globals graph as neccesary...
+ if (Function *FromF = dyn_cast<Function>(From)) {
+ Function *ToF = cast<Function>(To);
+ assert(!DSInfo.count(ToF) && "New Function already exists!");
+ DSGraph *NG = new DSGraph(getDSGraph(*FromF), GlobalECs);
+ DSInfo[ToF] = NG;
+ assert(NG->getReturnNodes().size() == 1 && "Cannot copy SCC's yet!");
+
+ // Change the Function* is the returnnodes map to the ToF.
+ DSNodeHandle Ret = NG->retnodes_begin()->second;
+ NG->getReturnNodes().clear();
+ NG->getReturnNodes()[ToF] = Ret;
+ return;
+ }
- Graph.removeDeadNodes(DSGraph::KeepUnreachableGlobals);
+ if (const Function *F = getFnForValue(To)) {
+ DSGraph &G = getDSGraph(*F);
+ G.getScalarMap().copyScalarIfExists(From, To);
+ return;
+ }
- DEBUG(std::cerr << " [BU] Done inlining: " << F.getName() << " ["
- << Graph.getGraphSize() << "+" << Graph.getAuxFunctionCalls().size()
- << "]\n");
- //Graph.writeGraphToFile(std::cerr, "bu_" + F.getName());
- return Graph;
+ std::cerr << *From;
+ std::cerr << *To;
+ assert(0 && "Do not know how to copy this yet!");
+ abort();
}
projects / oota-llvm.git / blobdiff