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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41001 91177308-0d34-0410-b5e6-96231b3b80d8
195 lines
6.4 KiB
C++
195 lines
6.4 KiB
C++
//===- CallGraphSCCPass.cpp - Pass that operates BU on call graph ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CallGraphSCCPass class, which is used for passes
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// which are implemented as bottom-up traversals on the call graph. Because
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// there may be cycles in the call graph, passes of this type operate on the
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// call-graph in SCC order: that is, they process function bottom-up, except for
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// recursive functions, which they process all at once.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CallGraphSCCPass.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/ADT/SCCIterator.h"
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#include "llvm/PassManagers.h"
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#include "llvm/Function.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// CGPassManager
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//
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/// CGPassManager manages FPPassManagers and CalLGraphSCCPasses.
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class CGPassManager : public ModulePass, public PMDataManager {
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public:
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static char ID;
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explicit CGPassManager(int Depth)
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: ModulePass((intptr_t)&ID), PMDataManager(Depth) { }
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/// run - Execute all of the passes scheduled for execution. Keep track of
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/// whether any of the passes modifies the module, and if so, return true.
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bool runOnModule(Module &M);
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bool doInitialization(CallGraph &CG);
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bool doFinalization(CallGraph &CG);
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/// Pass Manager itself does not invalidate any analysis info.
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void getAnalysisUsage(AnalysisUsage &Info) const {
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// CGPassManager walks SCC and it needs CallGraph.
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Info.addRequired<CallGraph>();
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Info.setPreservesAll();
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}
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virtual const char *getPassName() const {
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return "CallGraph Pass Manager";
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}
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// Print passes managed by this manager
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void dumpPassStructure(unsigned Offset) {
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llvm::cerr << std::string(Offset*2, ' ') << "Call Graph SCC Pass Manager\n";
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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Pass *P = getContainedPass(Index);
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P->dumpPassStructure(Offset + 1);
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dumpLastUses(P, Offset+1);
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}
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}
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Pass *getContainedPass(unsigned N) {
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assert ( N < PassVector.size() && "Pass number out of range!");
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Pass *FP = static_cast<Pass *>(PassVector[N]);
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return FP;
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}
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virtual PassManagerType getPassManagerType() const {
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return PMT_CallGraphPassManager;
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}
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};
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char CGPassManager::ID = 0;
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/// run - Execute all of the passes scheduled for execution. Keep track of
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/// whether any of the passes modifies the module, and if so, return true.
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bool CGPassManager::runOnModule(Module &M) {
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CallGraph &CG = getAnalysis<CallGraph>();
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bool Changed = doInitialization(CG);
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// Walk SCC
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for (scc_iterator<CallGraph*> I = scc_begin(&CG), E = scc_end(&CG);
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I != E; ++I) {
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// Run all passes on current SCC
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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Pass *P = getContainedPass(Index);
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AnalysisUsage AnUsage;
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P->getAnalysisUsage(AnUsage);
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dumpPassInfo(P, EXECUTION_MSG, ON_CG_MSG, "");
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dumpAnalysisSetInfo("Required", P, AnUsage.getRequiredSet());
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initializeAnalysisImpl(P);
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StartPassTimer(P);
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if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
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Changed |= CGSP->runOnSCC(*I); // TODO : What if CG is changed ?
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else {
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FPPassManager *FPP = dynamic_cast<FPPassManager *>(P);
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assert (FPP && "Invalid CGPassManager member");
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// Run pass P on all functions current SCC
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std::vector<CallGraphNode*> &SCC = *I;
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for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
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Function *F = SCC[i]->getFunction();
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if (F) {
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dumpPassInfo(P, EXECUTION_MSG, ON_FUNCTION_MSG, F->getNameStart());
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Changed |= FPP->runOnFunction(*F);
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}
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}
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}
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StopPassTimer(P);
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if (Changed)
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dumpPassInfo(P, MODIFICATION_MSG, ON_CG_MSG, "");
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dumpAnalysisSetInfo("Preserved", P, AnUsage.getPreservedSet());
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verifyPreservedAnalysis(P);
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removeNotPreservedAnalysis(P);
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recordAvailableAnalysis(P);
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removeDeadPasses(P, "", ON_CG_MSG);
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}
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}
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Changed |= doFinalization(CG);
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return Changed;
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}
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/// Initialize CG
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bool CGPassManager::doInitialization(CallGraph &CG) {
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bool Changed = false;
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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Pass *P = getContainedPass(Index);
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if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
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Changed |= CGSP->doInitialization(CG);
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}
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return Changed;
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}
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/// Finalize CG
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bool CGPassManager::doFinalization(CallGraph &CG) {
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bool Changed = false;
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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Pass *P = getContainedPass(Index);
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if (CallGraphSCCPass *CGSP = dynamic_cast<CallGraphSCCPass *>(P))
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Changed |= CGSP->doFinalization(CG);
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}
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return Changed;
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}
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/// Assign pass manager to manage this pass.
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void CallGraphSCCPass::assignPassManager(PMStack &PMS,
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PassManagerType PreferredType) {
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// Find CGPassManager
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while (!PMS.empty() &&
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PMS.top()->getPassManagerType() > PMT_CallGraphPassManager)
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PMS.pop();
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CGPassManager *CGP = dynamic_cast<CGPassManager *>(PMS.top());
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// Create new Call Graph SCC Pass Manager if it does not exist.
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if (!CGP) {
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assert (!PMS.empty() && "Unable to create Call Graph Pass Manager");
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PMDataManager *PMD = PMS.top();
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// [1] Create new Call Graph Pass Manager
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CGP = new CGPassManager(PMD->getDepth() + 1);
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// [2] Set up new manager's top level manager
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PMTopLevelManager *TPM = PMD->getTopLevelManager();
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TPM->addIndirectPassManager(CGP);
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// [3] Assign manager to manage this new manager. This may create
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// and push new managers into PMS
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Pass *P = dynamic_cast<Pass *>(CGP);
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TPM->schedulePass(P);
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// [4] Push new manager into PMS
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PMS.push(CGP);
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}
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CGP->add(this);
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}
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/// getAnalysisUsage - For this class, we declare that we require and preserve
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/// the call graph. If the derived class implements this method, it should
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/// always explicitly call the implementation here.
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void CallGraphSCCPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<CallGraph>();
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AU.addPreserved<CallGraph>();
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}
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