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