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//===- RegionInfo.cpp - SESE region detection analysis --------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// Detects single entry single exit regions in the control flow graph.
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/RegionInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/InitializePasses.h"
#ifndef NDEBUG
#include "llvm/Analysis/RegionPrinter.h"
#endif
#include "llvm/Analysis/RegionInfoImpl.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
using namespace llvm;
#define DEBUG_TYPE "region"
namespace llvm {
template class RegionBase<RegionTraits<Function>>;
template class RegionNodeBase<RegionTraits<Function>>;
template class RegionInfoBase<RegionTraits<Function>>;
} // end namespace llvm
STATISTIC(numRegions, "The # of regions");
STATISTIC(numSimpleRegions, "The # of simple regions");
// Always verify if expensive checking is enabled.
static cl::opt<bool,true>
VerifyRegionInfoX(
"verify-region-info",
cl::location(RegionInfoBase<RegionTraits<Function>>::VerifyRegionInfo),
cl::desc("Verify region info (time consuming)"));
static cl::opt<Region::PrintStyle, true> printStyleX("print-region-style",
cl::location(RegionInfo::printStyle),
cl::Hidden,
cl::desc("style of printing regions"),
cl::values(
clEnumValN(Region::PrintNone, "none", "print no details"),
clEnumValN(Region::PrintBB, "bb",
"print regions in detail with block_iterator"),
clEnumValN(Region::PrintRN, "rn",
"print regions in detail with element_iterator")));
//===----------------------------------------------------------------------===//
// Region implementation
//
Region::Region(BasicBlock *Entry, BasicBlock *Exit,
RegionInfo* RI,
DominatorTree *DT, Region *Parent) :
RegionBase<RegionTraits<Function>>(Entry, Exit, RI, DT, Parent) {
}
Region::~Region() = default;
//===----------------------------------------------------------------------===//
// RegionInfo implementation
//
RegionInfo::RegionInfo() = default;
RegionInfo::~RegionInfo() = default;
bool RegionInfo::invalidate(Function &F, const PreservedAnalyses &PA,
FunctionAnalysisManager::Invalidator &) {
// Check whether the analysis, all analyses on functions, or the function's
// CFG has been preserved.
auto PAC = PA.getChecker<RegionInfoAnalysis>();
return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
PAC.preservedSet<CFGAnalyses>());
}
void RegionInfo::updateStatistics(Region *R) {
++numRegions;
// TODO: Slow. Should only be enabled if -stats is used.
if (R->isSimple())
++numSimpleRegions;
}
void RegionInfo::recalculate(Function &F, DominatorTree *DT_,
PostDominatorTree *PDT_, DominanceFrontier *DF_) {
DT = DT_;
PDT = PDT_;
DF = DF_;
TopLevelRegion = new Region(&F.getEntryBlock(), nullptr,
this, DT, nullptr);
updateStatistics(TopLevelRegion);
calculate(F);
}
#ifndef NDEBUG
void RegionInfo::view() { viewRegion(this); }
void RegionInfo::viewOnly() { viewRegionOnly(this); }
#endif
//===----------------------------------------------------------------------===//
// RegionInfoPass implementation
//
RegionInfoPass::RegionInfoPass() : FunctionPass(ID) {
initializeRegionInfoPassPass(*PassRegistry::getPassRegistry());
}
RegionInfoPass::~RegionInfoPass() = default;
bool RegionInfoPass::runOnFunction(Function &F) {
releaseMemory();
auto DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
auto PDT = &getAnalysis<PostDominatorTreeWrapperPass>().getPostDomTree();
auto DF = &getAnalysis<DominanceFrontierWrapperPass>().getDominanceFrontier();
RI.recalculate(F, DT, PDT, DF);
return false;
}
void RegionInfoPass::releaseMemory() {
RI.releaseMemory();
}
void RegionInfoPass::verifyAnalysis() const {
RI.verifyAnalysis();
}
void RegionInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequiredTransitive<DominatorTreeWrapperPass>();
AU.addRequired<PostDominatorTreeWrapperPass>();
AU.addRequired<DominanceFrontierWrapperPass>();
}
void RegionInfoPass::print(raw_ostream &OS, const Module *) const {
RI.print(OS);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void RegionInfoPass::dump() const {
RI.dump();
}
#endif
char RegionInfoPass::ID = 0;
INITIALIZE_PASS_BEGIN(RegionInfoPass, "regions",
"Detect single entry single exit regions", true, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(PostDominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(DominanceFrontierWrapperPass)
INITIALIZE_PASS_END(RegionInfoPass, "regions",
"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 *createRegionInfoPass() {
return new RegionInfoPass();
}
} // end namespace llvm
//===----------------------------------------------------------------------===//
// RegionInfoAnalysis implementation
//
AnalysisKey RegionInfoAnalysis::Key;
RegionInfo RegionInfoAnalysis::run(Function &F, FunctionAnalysisManager &AM) {
RegionInfo RI;
auto *DT = &AM.getResult<DominatorTreeAnalysis>(F);
auto *PDT = &AM.getResult<PostDominatorTreeAnalysis>(F);
auto *DF = &AM.getResult<DominanceFrontierAnalysis>(F);
RI.recalculate(F, DT, PDT, DF);
return RI;
}
RegionInfoPrinterPass::RegionInfoPrinterPass(raw_ostream &OS)
: OS(OS) {}
PreservedAnalyses RegionInfoPrinterPass::run(Function &F,
FunctionAnalysisManager &AM) {
OS << "Region Tree for function: " << F.getName() << "\n";
AM.getResult<RegionInfoAnalysis>(F).print(OS);
return PreservedAnalyses::all();
}
PreservedAnalyses RegionInfoVerifierPass::run(Function &F,
FunctionAnalysisManager &AM) {
AM.getResult<RegionInfoAnalysis>(F).verifyAnalysis();
return PreservedAnalyses::all();
}
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