149 lines
4.7 KiB
C++
149 lines
4.7 KiB
C++
//===- lib/Codegen/MachineRegionInfo.cpp ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineRegionInfo.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Analysis/RegionInfoImpl.h"
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#include "llvm/CodeGen/MachinePostDominators.h"
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#include "llvm/Config/llvm-config.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#define DEBUG_TYPE "machine-region-info"
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using namespace llvm;
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STATISTIC(numMachineRegions, "The # of machine regions");
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STATISTIC(numMachineSimpleRegions, "The # of simple machine regions");
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namespace llvm {
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template class RegionBase<RegionTraits<MachineFunction>>;
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template class RegionNodeBase<RegionTraits<MachineFunction>>;
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template class RegionInfoBase<RegionTraits<MachineFunction>>;
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} // end namespace llvm
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//===----------------------------------------------------------------------===//
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// MachineRegion implementation
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MachineRegion::MachineRegion(MachineBasicBlock *Entry, MachineBasicBlock *Exit,
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MachineRegionInfo* RI,
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MachineDominatorTree *DT, MachineRegion *Parent) :
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RegionBase<RegionTraits<MachineFunction>>(Entry, Exit, RI, DT, Parent) {}
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MachineRegion::~MachineRegion() = default;
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//===----------------------------------------------------------------------===//
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// MachineRegionInfo implementation
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MachineRegionInfo::MachineRegionInfo() = default;
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MachineRegionInfo::~MachineRegionInfo() = default;
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void MachineRegionInfo::updateStatistics(MachineRegion *R) {
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++numMachineRegions;
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// TODO: Slow. Should only be enabled if -stats is used.
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if (R->isSimple())
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++numMachineSimpleRegions;
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}
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void MachineRegionInfo::recalculate(MachineFunction &F,
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MachineDominatorTree *DT_,
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MachinePostDominatorTree *PDT_,
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MachineDominanceFrontier *DF_) {
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DT = DT_;
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PDT = PDT_;
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DF = DF_;
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MachineBasicBlock *Entry = GraphTraits<MachineFunction*>::getEntryNode(&F);
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TopLevelRegion = new MachineRegion(Entry, nullptr, this, DT, nullptr);
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updateStatistics(TopLevelRegion);
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calculate(F);
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}
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//===----------------------------------------------------------------------===//
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// MachineRegionInfoPass implementation
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//
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MachineRegionInfoPass::MachineRegionInfoPass() : MachineFunctionPass(ID) {
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initializeMachineRegionInfoPassPass(*PassRegistry::getPassRegistry());
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}
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MachineRegionInfoPass::~MachineRegionInfoPass() = default;
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bool MachineRegionInfoPass::runOnMachineFunction(MachineFunction &F) {
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releaseMemory();
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auto DT = &getAnalysis<MachineDominatorTree>();
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auto PDT = &getAnalysis<MachinePostDominatorTree>();
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auto DF = &getAnalysis<MachineDominanceFrontier>();
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RI.recalculate(F, DT, PDT, DF);
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LLVM_DEBUG(RI.dump());
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return false;
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}
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void MachineRegionInfoPass::releaseMemory() {
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RI.releaseMemory();
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}
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void MachineRegionInfoPass::verifyAnalysis() const {
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// Only do verification when user wants to, otherwise this expensive check
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// will be invoked by PMDataManager::verifyPreservedAnalysis when
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// a regionpass (marked PreservedAll) finish.
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if (MachineRegionInfo::VerifyRegionInfo)
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RI.verifyAnalysis();
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}
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void MachineRegionInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<MachineDominatorTree>();
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AU.addRequired<MachinePostDominatorTree>();
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AU.addRequired<MachineDominanceFrontier>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void MachineRegionInfoPass::print(raw_ostream &OS, const Module *) const {
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RI.print(OS);
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void MachineRegionInfoPass::dump() const {
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RI.dump();
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}
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#endif
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char MachineRegionInfoPass::ID = 0;
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char &MachineRegionInfoPassID = MachineRegionInfoPass::ID;
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INITIALIZE_PASS_BEGIN(MachineRegionInfoPass, DEBUG_TYPE,
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"Detect single entry single exit regions", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(MachinePostDominatorTree)
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INITIALIZE_PASS_DEPENDENCY(MachineDominanceFrontier)
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INITIALIZE_PASS_END(MachineRegionInfoPass, DEBUG_TYPE,
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"Detect single entry single exit regions", true, true)
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// Create methods available outside of this file, to use them
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// "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
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// the link time optimization.
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namespace llvm {
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FunctionPass *createMachineRegionInfoPass() {
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return new MachineRegionInfoPass();
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}
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} // end namespace llvm
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