//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "cgscc-passmgr"
#include "llvm/CallGraphSCCPass.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/Function.h"
+#include "llvm/PassManagers.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/ADT/SCCIterator.h"
-#include "llvm/PassManagers.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// CGPassManager
//
-/// CGPassManager manages FPPassManagers and CalLGraphSCCPasses.
+/// CGPassManager manages FPPassManagers and CallGraphSCCPasses.
-class CGPassManager : public ModulePass, public PMDataManager {
+namespace {
+class CGPassManager : public ModulePass, public PMDataManager {
public:
- CGPassManager(int Depth) : PMDataManager(Depth) { }
+ static char ID;
+ explicit CGPassManager(int Depth)
+ : ModulePass(&ID), PMDataManager(Depth) { }
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the module, and if so, return true.
return "CallGraph Pass Manager";
}
+ virtual PMDataManager *getAsPMDataManager() { return this; }
+ virtual Pass *getAsPass() { return this; }
+
// Print passes managed by this manager
void dumpPassStructure(unsigned Offset) {
- llvm::cerr << std::string(Offset*2, ' ') << "Call Graph SCC Pass Manager\n";
+ errs().indent(Offset*2) << "Call Graph SCC Pass Manager\n";
for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
Pass *P = getContainedPass(Index);
P->dumpPassStructure(Offset + 1);
}
Pass *getContainedPass(unsigned N) {
- assert ( N < PassVector.size() && "Pass number out of range!");
- Pass *FP = static_cast<Pass *>(PassVector[N]);
- return FP;
+ assert(N < PassVector.size() && "Pass number out of range!");
+ return static_cast<Pass *>(PassVector[N]);
}
- virtual PassManagerType getPassManagerType() {
+ virtual PassManagerType getPassManagerType() const {
return PMT_CallGraphPassManager;
}
+
+private:
+ bool RunPassOnSCC(Pass *P, std::vector<CallGraphNode*> &CurSCC,
+ CallGraph &CG, bool &CallGraphUpToDate);
+ void RefreshCallGraph(std::vector<CallGraphNode*> &CurSCC, CallGraph &CG,
+ bool IsCheckingMode);
};
+} // end anonymous namespace.
+
+char CGPassManager::ID = 0;
+
+bool CGPassManager::RunPassOnSCC(Pass *P, std::vector<CallGraphNode*> &CurSCC,
+ CallGraph &CG, bool &CallGraphUpToDate) {
+ bool Changed = false;
+ PMDataManager *PM = P->getAsPMDataManager();
+
+ if (PM == 0) {
+ CallGraphSCCPass *CGSP = (CallGraphSCCPass*)P;
+ if (!CallGraphUpToDate) {
+ RefreshCallGraph(CurSCC, CG, false);
+ CallGraphUpToDate = true;
+ }
+
+ {
+ TimeRegion PassTimer(getPassTimer(CGSP));
+ Changed = CGSP->runOnSCC(CurSCC);
+ }
+
+ // After the CGSCCPass is done, when assertions are enabled, use
+ // RefreshCallGraph to verify that the callgraph was correctly updated.
+#ifndef NDEBUG
+ if (Changed)
+ RefreshCallGraph(CurSCC, CG, true);
+#endif
+
+ return Changed;
+ }
+
+
+ assert(PM->getPassManagerType() == PMT_FunctionPassManager &&
+ "Invalid CGPassManager member");
+ FPPassManager *FPP = (FPPassManager*)P;
+
+ // Run pass P on all functions in the current SCC.
+ for (unsigned i = 0, e = CurSCC.size(); i != e; ++i) {
+ if (Function *F = CurSCC[i]->getFunction()) {
+ dumpPassInfo(P, EXECUTION_MSG, ON_FUNCTION_MSG, F->getName());
+ TimeRegion PassTimer(getPassTimer(FPP));
+ Changed |= FPP->runOnFunction(*F);
+ }
+ }
+
+ // The function pass(es) modified the IR, they may have clobbered the
+ // callgraph.
+ if (Changed && CallGraphUpToDate) {
+ DEBUG(dbgs() << "CGSCCPASSMGR: Pass Dirtied SCC: "
+ << P->getPassName() << '\n');
+ CallGraphUpToDate = false;
+ }
+ return Changed;
+}
+
+
+/// RefreshCallGraph - Scan the functions in the specified CFG and resync the
+/// callgraph with the call sites found in it. This is used after
+/// FunctionPasses have potentially munged the callgraph, and can be used after
+/// CallGraphSCC passes to verify that they correctly updated the callgraph.
+///
+void CGPassManager::RefreshCallGraph(std::vector<CallGraphNode*> &CurSCC,
+ CallGraph &CG, bool CheckingMode) {
+ DenseMap<Value*, CallGraphNode*> CallSites;
+
+ DEBUG(dbgs() << "CGSCCPASSMGR: Refreshing SCC with " << CurSCC.size()
+ << " nodes:\n";
+ for (unsigned i = 0, e = CurSCC.size(); i != e; ++i)
+ CurSCC[i]->dump();
+ );
+
+ bool MadeChange = false;
+
+ // Scan all functions in the SCC.
+ for (unsigned sccidx = 0, e = CurSCC.size(); sccidx != e; ++sccidx) {
+ CallGraphNode *CGN = CurSCC[sccidx];
+ Function *F = CGN->getFunction();
+ if (F == 0 || F->isDeclaration()) continue;
+
+ // Walk the function body looking for call sites. Sync up the call sites in
+ // CGN with those actually in the function.
+
+ // Get the set of call sites currently in the function.
+ for (CallGraphNode::iterator I = CGN->begin(), E = CGN->end(); I != E; ) {
+ // If this call site is null, then the function pass deleted the call
+ // entirely and the WeakVH nulled it out.
+ if (I->first == 0 ||
+ // If we've already seen this call site, then the FunctionPass RAUW'd
+ // one call with another, which resulted in two "uses" in the edge
+ // list of the same call.
+ CallSites.count(I->first) ||
+
+ // If the call edge is not from a call or invoke, then the function
+ // pass RAUW'd a call with another value. This can happen when
+ // constant folding happens of well known functions etc.
+ CallSite::get(I->first).getInstruction() == 0) {
+ assert(!CheckingMode &&
+ "CallGraphSCCPass did not update the CallGraph correctly!");
+
+ // Just remove the edge from the set of callees, keep track of whether
+ // I points to the last element of the vector.
+ bool WasLast = I + 1 == E;
+ CGN->removeCallEdge(I);
+
+ // If I pointed to the last element of the vector, we have to bail out:
+ // iterator checking rejects comparisons of the resultant pointer with
+ // end.
+ if (WasLast)
+ break;
+ E = CGN->end();
+ continue;
+ }
+
+ assert(!CallSites.count(I->first) &&
+ "Call site occurs in node multiple times");
+ CallSites.insert(std::make_pair(I->first, I->second));
+ ++I;
+ }
+
+ // Loop over all of the instructions in the function, getting the callsites.
+ for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
+ for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
+ CallSite CS = CallSite::get(I);
+ if (!CS.getInstruction() || isa<DbgInfoIntrinsic>(I)) continue;
+
+ // If this call site already existed in the callgraph, just verify it
+ // matches up to expectations and remove it from CallSites.
+ DenseMap<Value*, CallGraphNode*>::iterator ExistingIt =
+ CallSites.find(CS.getInstruction());
+ if (ExistingIt != CallSites.end()) {
+ CallGraphNode *ExistingNode = ExistingIt->second;
+
+ // Remove from CallSites since we have now seen it.
+ CallSites.erase(ExistingIt);
+
+ // Verify that the callee is right.
+ if (ExistingNode->getFunction() == CS.getCalledFunction())
+ continue;
+
+ // If we are in checking mode, we are not allowed to actually mutate
+ // the callgraph. If this is a case where we can infer that the
+ // callgraph is less precise than it could be (e.g. an indirect call
+ // site could be turned direct), don't reject it in checking mode, and
+ // don't tweak it to be more precise.
+ if (CheckingMode && CS.getCalledFunction() &&
+ ExistingNode->getFunction() == 0)
+ continue;
+
+ assert(!CheckingMode &&
+ "CallGraphSCCPass did not update the CallGraph correctly!");
+
+ // If not, we either went from a direct call to indirect, indirect to
+ // direct, or direct to different direct.
+ CallGraphNode *CalleeNode;
+ if (Function *Callee = CS.getCalledFunction())
+ CalleeNode = CG.getOrInsertFunction(Callee);
+ else
+ CalleeNode = CG.getCallsExternalNode();
+
+ // Update the edge target in CGN.
+ for (CallGraphNode::iterator I = CGN->begin(); ; ++I) {
+ assert(I != CGN->end() && "Didn't find call entry");
+ if (I->first == CS.getInstruction()) {
+ I->second = CalleeNode;
+ break;
+ }
+ }
+ MadeChange = true;
+ continue;
+ }
+
+ assert(!CheckingMode &&
+ "CallGraphSCCPass did not update the CallGraph correctly!");
+
+ // If the call site didn't exist in the CGN yet, add it. We assume that
+ // newly introduced call sites won't be indirect. This could be fixed
+ // in the future.
+ CallGraphNode *CalleeNode;
+ if (Function *Callee = CS.getCalledFunction())
+ CalleeNode = CG.getOrInsertFunction(Callee);
+ else
+ CalleeNode = CG.getCallsExternalNode();
+
+ CGN->addCalledFunction(CS, CalleeNode);
+ MadeChange = true;
+ }
+
+ // After scanning this function, if we still have entries in callsites, then
+ // they are dangling pointers. WeakVH should save us for this, so abort if
+ // this happens.
+ assert(CallSites.empty() && "Dangling pointers found in call sites map");
+
+ // Periodically do an explicit clear to remove tombstones when processing
+ // large scc's.
+ if ((sccidx & 15) == 0)
+ CallSites.clear();
+ }
+
+ DEBUG(if (MadeChange) {
+ dbgs() << "CGSCCPASSMGR: Refreshed SCC is now:\n";
+ for (unsigned i = 0, e = CurSCC.size(); i != e; ++i)
+ CurSCC[i]->dump();
+ } else {
+ dbgs() << "CGSCCPASSMGR: SCC Refresh didn't change call graph.\n";
+ }
+ );
+}
+
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the module, and if so, return true.
bool CGPassManager::runOnModule(Module &M) {
CallGraph &CG = getAnalysis<CallGraph>();
bool Changed = doInitialization(CG);
- std::string Msg1 = "Executing Pass '";
- std::string Msg3 = "' Made Modification '";
-
- // Walk SCC
- for (scc_iterator<CallGraph*> I = scc_begin(&CG), E = scc_end(&CG);
- I != E; ++I) {
-
- // Run all passes on current SCC
- for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
-
- Pass *P = getContainedPass(Index);
- AnalysisUsage AnUsage;
- P->getAnalysisUsage(AnUsage);
-
- std::string Msg2 = "' on Call Graph ...\n'";
- dumpPassInfo(P, Msg1, Msg2);
- dumpAnalysisSetInfo("Required", P, AnUsage.getRequiredSet());
+ std::vector<CallGraphNode*> CurSCC;
+
+ // Walk the callgraph in bottom-up SCC order.
+ for (scc_iterator<CallGraph*> CGI = scc_begin(&CG), E = scc_end(&CG);
+ CGI != E;) {
+ // Copy the current SCC and increment past it so that the pass can hack
+ // on the SCC if it wants to without invalidating our iterator.
+ CurSCC = *CGI;
+ ++CGI;
+
+
+ // CallGraphUpToDate - Keep track of whether the callgraph is known to be
+ // up-to-date or not. The CGSSC pass manager runs two types of passes:
+ // CallGraphSCC Passes and other random function passes. Because other
+ // random function passes are not CallGraph aware, they may clobber the
+ // call graph by introducing new calls or deleting other ones. This flag
+ // is set to false when we run a function pass so that we know to clean up
+ // the callgraph when we need to run a CGSCCPass again.
+ bool CallGraphUpToDate = true;
+
+ // Run all passes on current SCC.
+ for (unsigned PassNo = 0, e = getNumContainedPasses();
+ PassNo != e; ++PassNo) {
+ Pass *P = getContainedPass(PassNo);
+
+ // If we're in -debug-pass=Executions mode, construct the SCC node list,
+ // otherwise avoid constructing this string as it is expensive.
+ if (isPassDebuggingExecutionsOrMore()) {
+ std::string Functions;
+#ifndef NDEBUG
+ raw_string_ostream OS(Functions);
+ for (unsigned i = 0, e = CurSCC.size(); i != e; ++i) {
+ if (i) OS << ", ";
+ CurSCC[i]->print(OS);
+ }
+ OS.flush();
+#endif
+ dumpPassInfo(P, EXECUTION_MSG, ON_CG_MSG, Functions);
+ }
+ dumpRequiredSet(P);
initializeAnalysisImpl(P);
- StartPassTimer(P);
- if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
- Changed |= CGSP->runOnSCC(*I); // TODO : What if CG is changed ?
- else {
- FPPassManager *FPP = dynamic_cast<FPPassManager *>(P);
- assert (FPP && "Invalid CGPassManager member");
-
- // Run pass P on all functions current SCC
- std::vector<CallGraphNode*> &SCC = *I;
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
- if (F)
- Changed |= FPP->runOnFunction(*F);
- }
- }
- StopPassTimer(P);
+ // Actually run this pass on the current SCC.
+ Changed |= RunPassOnSCC(P, CurSCC, CG, CallGraphUpToDate);
if (Changed)
- dumpPassInfo(P, Msg3, Msg2);
- dumpAnalysisSetInfo("Preserved", P, AnUsage.getPreservedSet());
-
+ dumpPassInfo(P, MODIFICATION_MSG, ON_CG_MSG, "");
+ dumpPreservedSet(P);
+
+ verifyPreservedAnalysis(P);
removeNotPreservedAnalysis(P);
recordAvailableAnalysis(P);
- removeDeadPasses(P, Msg2);
+ removeDeadPasses(P, "", ON_CG_MSG);
}
+
+ // If the callgraph was left out of date (because the last pass run was a
+ // functionpass), refresh it before we move on to the next SCC.
+ if (!CallGraphUpToDate)
+ RefreshCallGraph(CurSCC, CG, false);
}
Changed |= doFinalization(CG);
return Changed;
/// Initialize CG
bool CGPassManager::doInitialization(CallGraph &CG) {
bool Changed = false;
- for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
- Pass *P = getContainedPass(Index);
- if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
- Changed |= CGSP->doInitialization(CG);
+ for (unsigned i = 0, e = getNumContainedPasses(); i != e; ++i) {
+ if (PMDataManager *PM = getContainedPass(i)->getAsPMDataManager()) {
+ assert(PM->getPassManagerType() == PMT_FunctionPassManager &&
+ "Invalid CGPassManager member");
+ Changed |= ((FPPassManager*)PM)->doInitialization(CG.getModule());
+ } else {
+ Changed |= ((CallGraphSCCPass*)getContainedPass(i))->doInitialization(CG);
+ }
}
return Changed;
}
/// Finalize CG
bool CGPassManager::doFinalization(CallGraph &CG) {
bool Changed = false;
- for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
- Pass *P = getContainedPass(Index);
- if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
- Changed |= CGSP->doFinalization(CG);
+ for (unsigned i = 0, e = getNumContainedPasses(); i != e; ++i) {
+ if (PMDataManager *PM = getContainedPass(i)->getAsPMDataManager()) {
+ assert(PM->getPassManagerType() == PMT_FunctionPassManager &&
+ "Invalid CGPassManager member");
+ Changed |= ((FPPassManager*)PM)->doFinalization(CG.getModule());
+ } else {
+ Changed |= ((CallGraphSCCPass*)getContainedPass(i))->doFinalization(CG);
+ }
}
return Changed;
}
/// Assign pass manager to manage this pass.
void CallGraphSCCPass::assignPassManager(PMStack &PMS,
- PassManagerType PreferredType) {
+ PassManagerType PreferredType) {
// Find CGPassManager
- while (!PMS.empty()) {
- if (PMS.top()->getPassManagerType() > PMT_CallGraphPassManager)
- PMS.pop();
- else;
- break;
- }
-
- CGPassManager *CGP = dynamic_cast<CGPassManager *>(PMS.top());
-
- // Create new Call Graph SCC Pass Manager if it does not exist.
- if (!CGP) {
-
- assert (!PMS.empty() && "Unable to create Call Graph Pass Manager");
+ while (!PMS.empty() &&
+ PMS.top()->getPassManagerType() > PMT_CallGraphPassManager)
+ PMS.pop();
+
+ assert(!PMS.empty() && "Unable to handle Call Graph Pass");
+ CGPassManager *CGP;
+
+ if (PMS.top()->getPassManagerType() == PMT_CallGraphPassManager)
+ CGP = (CGPassManager*)PMS.top();
+ else {
+ // Create new Call Graph SCC Pass Manager if it does not exist.
+ assert(!PMS.empty() && "Unable to create Call Graph Pass Manager");
PMDataManager *PMD = PMS.top();
// [1] Create new Call Graph Pass Manager
// [3] Assign manager to manage this new manager. This may create
// and push new managers into PMS
- Pass *P = dynamic_cast<Pass *>(CGP);
- P->assignPassManager(PMS);
+ Pass *P = CGP;
+ TPM->schedulePass(P);
// [4] Push new manager into PMS
PMS.push(CGP);
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