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+//===- RegionInfoImpl.h - SESE region detection analysis --------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Detects single entry single exit regions in the control flow graph.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_REGIONINFOIMPL_H
+#define LLVM_ANALYSIS_REGIONINFOIMPL_H
+
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/Analysis/DominanceFrontier.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/PostDominators.h"
+#include "llvm/Analysis/RegionInfo.h"
+#include "llvm/Analysis/RegionIterator.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <algorithm>
+#include <iterator>
+#include <set>
+
+namespace llvm {
+
+#define DEBUG_TYPE "region"
+
+//===----------------------------------------------------------------------===//
+/// RegionBase Implementation
+template <class Tr>
+RegionBase<Tr>::RegionBase(BlockT *Entry, BlockT *Exit,
+ typename Tr::RegionInfoT *RInfo, DomTreeT *dt,
+ RegionT *Parent)
+ : RegionNodeBase<Tr>(Parent, Entry, 1), RI(RInfo), DT(dt), exit(Exit) {}
+
+template <class Tr>
+RegionBase<Tr>::~RegionBase() {
+ // Free the cached nodes.
+ for (typename BBNodeMapT::iterator it = BBNodeMap.begin(),
+ ie = BBNodeMap.end();
+ it != ie; ++it)
+ delete it->second;
+
+ // Only clean the cache for this Region. Caches of child Regions will be
+ // cleaned when the child Regions are deleted.
+ BBNodeMap.clear();
+}
+
+template <class Tr>
+void RegionBase<Tr>::replaceEntry(BlockT *BB) {
+ this->entry.setPointer(BB);
+}
+
+template <class Tr>
+void RegionBase<Tr>::replaceExit(BlockT *BB) {
+ assert(exit && "No exit to replace!");
+ exit = BB;
+}
+
+template <class Tr>
+void RegionBase<Tr>::replaceEntryRecursive(BlockT *NewEntry) {
+ std::vector<RegionT *> RegionQueue;
+ BlockT *OldEntry = getEntry();
+
+ RegionQueue.push_back(static_cast<RegionT *>(this));
+ while (!RegionQueue.empty()) {
+ RegionT *R = RegionQueue.back();
+ RegionQueue.pop_back();
+
+ R->replaceEntry(NewEntry);
+ for (typename RegionT::const_iterator RI = R->begin(), RE = R->end();
+ RI != RE; ++RI) {
+ if ((*RI)->getEntry() == OldEntry)
+ RegionQueue.push_back(RI->get());
+ }
+ }
+}
+
+template <class Tr>
+void RegionBase<Tr>::replaceExitRecursive(BlockT *NewExit) {
+ std::vector<RegionT *> RegionQueue;
+ BlockT *OldExit = getExit();
+
+ RegionQueue.push_back(static_cast<RegionT *>(this));
+ while (!RegionQueue.empty()) {
+ RegionT *R = RegionQueue.back();
+ RegionQueue.pop_back();
+
+ R->replaceExit(NewExit);
+ for (typename RegionT::const_iterator RI = R->begin(), RE = R->end();
+ RI != RE; ++RI) {
+ if ((*RI)->getExit() == OldExit)
+ RegionQueue.push_back(RI->get());
+ }
+ }
+}
+
+template <class Tr>
+bool RegionBase<Tr>::contains(const BlockT *B) const {
+ BlockT *BB = const_cast<BlockT *>(B);
+
+ if (!DT->getNode(BB))
+ return false;
+
+ BlockT *entry = getEntry(), *exit = getExit();
+
+ // Toplevel region.
+ if (!exit)
+ return true;
+
+ return (DT->dominates(entry, BB) &&
+ !(DT->dominates(exit, BB) && DT->dominates(entry, exit)));
+}
+
+template <class Tr>
+bool RegionBase<Tr>::contains(const LoopT *L) const {
+ // BBs that are not part of any loop are element of the Loop
+ // described by the NULL pointer. This loop is not part of any region,
+ // except if the region describes the whole function.
+ if (!L)
+ return getExit() == nullptr;
+
+ if (!contains(L->getHeader()))
+ return false;
+
+ SmallVector<BlockT *, 8> ExitingBlocks;
+ L->getExitingBlocks(ExitingBlocks);
+
+ for (BlockT *BB : ExitingBlocks) {
+ if (!contains(BB))
+ return false;
+ }
+
+ return true;
+}
+
+template <class Tr>
+typename Tr::LoopT *RegionBase<Tr>::outermostLoopInRegion(LoopT *L) const {
+ if (!contains(L))
+ return nullptr;
+
+ while (L && contains(L->getParentLoop())) {
+ L = L->getParentLoop();
+ }
+
+ return L;
+}
+
+template <class Tr>
+typename Tr::LoopT *RegionBase<Tr>::outermostLoopInRegion(LoopInfoT *LI,
+ BlockT *BB) const {
+ assert(LI && BB && "LI and BB cannot be null!");
+ LoopT *L = LI->getLoopFor(BB);
+ return outermostLoopInRegion(L);
+}
+
+template <class Tr>
+typename RegionBase<Tr>::BlockT *RegionBase<Tr>::getEnteringBlock() const {
+ BlockT *entry = getEntry();
+ BlockT *Pred;
+ BlockT *enteringBlock = nullptr;
+
+ for (PredIterTy PI = InvBlockTraits::child_begin(entry),
+ PE = InvBlockTraits::child_end(entry);
+ PI != PE; ++PI) {
+ Pred = *PI;
+ if (DT->getNode(Pred) && !contains(Pred)) {
+ if (enteringBlock)
+ return nullptr;
+
+ enteringBlock = Pred;
+ }
+ }
+
+ return enteringBlock;
+}
+
+template <class Tr>
+typename RegionBase<Tr>::BlockT *RegionBase<Tr>::getExitingBlock() const {
+ BlockT *exit = getExit();
+ BlockT *Pred;
+ BlockT *exitingBlock = nullptr;
+
+ if (!exit)
+ return nullptr;
+
+ for (PredIterTy PI = InvBlockTraits::child_begin(exit),
+ PE = InvBlockTraits::child_end(exit);
+ PI != PE; ++PI) {
+ Pred = *PI;
+ if (contains(Pred)) {
+ if (exitingBlock)
+ return nullptr;
+
+ exitingBlock = Pred;
+ }
+ }
+
+ return exitingBlock;
+}
+
+template <class Tr>
+bool RegionBase<Tr>::isSimple() const {
+ return !isTopLevelRegion() && getEnteringBlock() && getExitingBlock();
+}
+
+template <class Tr>
+std::string RegionBase<Tr>::getNameStr() const {
+ std::string exitName;
+ std::string entryName;
+
+ if (getEntry()->getName().empty()) {
+ raw_string_ostream OS(entryName);
+
+ getEntry()->printAsOperand(OS, false);
+ } else
+ entryName = getEntry()->getName();
+
+ if (getExit()) {
+ if (getExit()->getName().empty()) {
+ raw_string_ostream OS(exitName);
+
+ getExit()->printAsOperand(OS, false);
+ } else
+ exitName = getExit()->getName();
+ } else
+ exitName = "<Function Return>";
+
+ return entryName + " => " + exitName;
+}
+
+template <class Tr>
+void RegionBase<Tr>::verifyBBInRegion(BlockT *BB) const {
+ if (!contains(BB))
+ llvm_unreachable("Broken region found!");
+
+ BlockT *entry = getEntry(), *exit = getExit();
+
+ for (SuccIterTy SI = BlockTraits::child_begin(BB),
+ SE = BlockTraits::child_end(BB);
+ SI != SE; ++SI) {
+ if (!contains(*SI) && exit != *SI)
+ llvm_unreachable("Broken region found!");
+ }
+
+ if (entry != BB) {
+ for (PredIterTy SI = InvBlockTraits::child_begin(BB),
+ SE = InvBlockTraits::child_end(BB);
+ SI != SE; ++SI) {
+ if (!contains(*SI))
+ llvm_unreachable("Broken region found!");
+ }
+ }
+}
+
+template <class Tr>
+void RegionBase<Tr>::verifyWalk(BlockT *BB, std::set<BlockT *> *visited) const {
+ BlockT *exit = getExit();
+
+ visited->insert(BB);
+
+ verifyBBInRegion(BB);
+
+ for (SuccIterTy SI = BlockTraits::child_begin(BB),
+ SE = BlockTraits::child_end(BB);
+ SI != SE; ++SI) {
+ if (*SI != exit && visited->find(*SI) == visited->end())
+ verifyWalk(*SI, visited);
+ }
+}
+
+template <class Tr>
+void RegionBase<Tr>::verifyRegion() 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 (!RegionInfoBase<Tr>::VerifyRegionInfo)
+ return;
+
+ std::set<BlockT *> visited;
+ verifyWalk(getEntry(), &visited);
+}
+
+template <class Tr>
+void RegionBase<Tr>::verifyRegionNest() const {
+ for (typename RegionT::const_iterator RI = begin(), RE = end(); RI != RE;
+ ++RI)
+ (*RI)->verifyRegionNest();
+
+ verifyRegion();
+}
+
+template <class Tr>
+typename RegionBase<Tr>::element_iterator RegionBase<Tr>::element_begin() {
+ return GraphTraits<RegionT *>::nodes_begin(static_cast<RegionT *>(this));
+}
+
+template <class Tr>
+typename RegionBase<Tr>::element_iterator RegionBase<Tr>::element_end() {
+ return GraphTraits<RegionT *>::nodes_end(static_cast<RegionT *>(this));
+}
+
+template <class Tr>
+typename RegionBase<Tr>::const_element_iterator
+RegionBase<Tr>::element_begin() const {
+ return GraphTraits<const RegionT *>::nodes_begin(
+ static_cast<const RegionT *>(this));
+}
+
+template <class Tr>
+typename RegionBase<Tr>::const_element_iterator
+RegionBase<Tr>::element_end() const {
+ return GraphTraits<const RegionT *>::nodes_end(
+ static_cast<const RegionT *>(this));
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionBase<Tr>::getSubRegionNode(BlockT *BB) const {
+ typedef typename Tr::RegionT RegionT;
+ RegionT *R = RI->getRegionFor(BB);
+
+ if (!R || R == this)
+ return nullptr;
+
+ // If we pass the BB out of this region, that means our code is broken.
+ assert(contains(R) && "BB not in current region!");
+
+ while (contains(R->getParent()) && R->getParent() != this)
+ R = R->getParent();
+
+ if (R->getEntry() != BB)
+ return nullptr;
+
+ return R;
+}
+
+template <class Tr>
+typename Tr::RegionNodeT *RegionBase<Tr>::getBBNode(BlockT *BB) const {
+ assert(contains(BB) && "Can get BB node out of this region!");
+
+ typename BBNodeMapT::const_iterator at = BBNodeMap.find(BB);
+
+ if (at != BBNodeMap.end())
+ return at->second;
+
+ auto Deconst = const_cast<RegionBase<Tr> *>(this);
+ RegionNodeT *NewNode = new RegionNodeT(static_cast<RegionT *>(Deconst), BB);
+ BBNodeMap.insert(std::make_pair(BB, NewNode));
+ return NewNode;
+}
+
+template <class Tr>
+typename Tr::RegionNodeT *RegionBase<Tr>::getNode(BlockT *BB) const {
+ assert(contains(BB) && "Can get BB node out of this region!");
+ if (RegionT *Child = getSubRegionNode(BB))
+ return Child->getNode();
+
+ return getBBNode(BB);
+}
+
+template <class Tr>
+void RegionBase<Tr>::transferChildrenTo(RegionT *To) {
+ for (iterator I = begin(), E = end(); I != E; ++I) {
+ (*I)->parent = To;
+ To->children.push_back(std::move(*I));
+ }
+ children.clear();
+}
+
+template <class Tr>
+void RegionBase<Tr>::addSubRegion(RegionT *SubRegion, bool moveChildren) {
+ assert(!SubRegion->parent && "SubRegion already has a parent!");
+ assert(std::find_if(begin(), end(), [&](const std::unique_ptr<RegionT> &R) {
+ return R.get() == SubRegion;
+ }) == children.end() &&
+ "Subregion already exists!");
+
+ SubRegion->parent = static_cast<RegionT *>(this);
+ children.push_back(std::unique_ptr<RegionT>(SubRegion));
+
+ if (!moveChildren)
+ return;
+
+ assert(SubRegion->children.empty() &&
+ "SubRegions that contain children are not supported");
+
+ for (element_iterator I = element_begin(), E = element_end(); I != E; ++I) {
+ if (!(*I)->isSubRegion()) {
+ BlockT *BB = (*I)->template getNodeAs<BlockT>();
+
+ if (SubRegion->contains(BB))
+ RI->setRegionFor(BB, SubRegion);
+ }
+ }
+
+ std::vector<std::unique_ptr<RegionT>> Keep;
+ for (iterator I = begin(), E = end(); I != E; ++I) {
+ if (SubRegion->contains(I->get()) && I->get() != SubRegion) {
+ (*I)->parent = SubRegion;
+ SubRegion->children.push_back(std::move(*I));
+ } else
+ Keep.push_back(std::move(*I));
+ }
+
+ children.clear();
+ children.insert(
+ children.begin(),
+ std::move_iterator<typename RegionSet::iterator>(Keep.begin()),
+ std::move_iterator<typename RegionSet::iterator>(Keep.end()));
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionBase<Tr>::removeSubRegion(RegionT *Child) {
+ assert(Child->parent == this && "Child is not a child of this region!");
+ Child->parent = nullptr;
+ typename RegionSet::iterator I = std::find_if(
+ children.begin(), children.end(),
+ [&](const std::unique_ptr<RegionT> &R) { return R.get() == Child; });
+ assert(I != children.end() && "Region does not exit. Unable to remove.");
+ children.erase(children.begin() + (I - begin()));
+ return Child;
+}
+
+template <class Tr>
+unsigned RegionBase<Tr>::getDepth() const {
+ unsigned Depth = 0;
+
+ for (RegionT *R = getParent(); R != nullptr; R = R->getParent())
+ ++Depth;
+
+ return Depth;
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionBase<Tr>::getExpandedRegion() const {
+ unsigned NumSuccessors = Tr::getNumSuccessors(exit);
+
+ if (NumSuccessors == 0)
+ return nullptr;
+
+ for (PredIterTy PI = InvBlockTraits::child_begin(getExit()),
+ PE = InvBlockTraits::child_end(getExit());
+ PI != PE; ++PI) {
+ if (!DT->dominates(getEntry(), *PI))
+ return nullptr;
+ }
+
+ RegionT *R = RI->getRegionFor(exit);
+
+ if (R->getEntry() != exit) {
+ if (Tr::getNumSuccessors(exit) == 1)
+ return new RegionT(getEntry(), *BlockTraits::child_begin(exit), RI, DT);
+ return nullptr;
+ }
+
+ while (R->getParent() && R->getParent()->getEntry() == exit)
+ R = R->getParent();
+
+ if (!DT->dominates(getEntry(), R->getExit())) {
+ for (PredIterTy PI = InvBlockTraits::child_begin(getExit()),
+ PE = InvBlockTraits::child_end(getExit());
+ PI != PE; ++PI) {
+ if (!DT->dominates(R->getExit(), *PI))
+ return nullptr;
+ }
+ }
+
+ return new RegionT(getEntry(), R->getExit(), RI, DT);
+}
+
+template <class Tr>
+void RegionBase<Tr>::print(raw_ostream &OS, bool print_tree, unsigned level,
+ PrintStyle Style) const {
+ if (print_tree)
+ OS.indent(level * 2) << '[' << level << "] " << getNameStr();
+ else
+ OS.indent(level * 2) << getNameStr();
+
+ OS << '\n';
+
+ if (Style != PrintNone) {
+ OS.indent(level * 2) << "{\n";
+ OS.indent(level * 2 + 2);
+
+ if (Style == PrintBB) {
+ for (const auto &BB : blocks())
+ OS << BB->getName() << ", "; // TODO: remove the last ","
+ } else if (Style == PrintRN) {
+ for (const_element_iterator I = element_begin(), E = element_end();
+ I != E; ++I) {
+ OS << **I << ", "; // TODO: remove the last ",
+ }
+ }
+
+ OS << '\n';
+ }
+
+ if (print_tree) {
+ for (const_iterator RI = begin(), RE = end(); RI != RE; ++RI)
+ (*RI)->print(OS, print_tree, level + 1, Style);
+ }
+
+ if (Style != PrintNone)
+ OS.indent(level * 2) << "} \n";
+}
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+template <class Tr>
+void RegionBase<Tr>::dump() const {
+ print(dbgs(), true, getDepth(), RegionInfoBase<Tr>::printStyle);
+}
+#endif
+
+template <class Tr>
+void RegionBase<Tr>::clearNodeCache() {
+ // Free the cached nodes.
+ for (typename BBNodeMapT::iterator I = BBNodeMap.begin(),
+ IE = BBNodeMap.end();
+ I != IE; ++I)
+ delete I->second;
+
+ BBNodeMap.clear();
+ for (typename RegionT::iterator RI = begin(), RE = end(); RI != RE; ++RI)
+ (*RI)->clearNodeCache();
+}
+
+//===----------------------------------------------------------------------===//
+// RegionInfoBase implementation
+//
+
+template <class Tr>
+RegionInfoBase<Tr>::RegionInfoBase()
+ : TopLevelRegion(nullptr) {}
+
+template <class Tr>
+RegionInfoBase<Tr>::~RegionInfoBase() {
+ releaseMemory();
+}
+
+template <class Tr>
+bool RegionInfoBase<Tr>::isCommonDomFrontier(BlockT *BB, BlockT *entry,
+ BlockT *exit) const {
+ for (PredIterTy PI = InvBlockTraits::child_begin(BB),
+ PE = InvBlockTraits::child_end(BB);
+ PI != PE; ++PI) {
+ BlockT *P = *PI;
+ if (DT->dominates(entry, P) && !DT->dominates(exit, P))
+ return false;
+ }
+
+ return true;
+}
+
+template <class Tr>
+bool RegionInfoBase<Tr>::isRegion(BlockT *entry, BlockT *exit) const {
+ assert(entry && exit && "entry and exit must not be null!");
+ typedef typename DomFrontierT::DomSetType DST;
+
+ DST *entrySuccs = &DF->find(entry)->second;
+
+ // Exit is the header of a loop that contains the entry. In this case,
+ // the dominance frontier must only contain the exit.
+ if (!DT->dominates(entry, exit)) {
+ for (typename DST::iterator SI = entrySuccs->begin(),
+ SE = entrySuccs->end();
+ SI != SE; ++SI) {
+ if (*SI != exit && *SI != entry)
+ return false;
+ }
+
+ return true;
+ }
+
+ DST *exitSuccs = &DF->find(exit)->second;
+
+ // Do not allow edges leaving the region.
+ for (typename DST::iterator SI = entrySuccs->begin(), SE = entrySuccs->end();
+ SI != SE; ++SI) {
+ if (*SI == exit || *SI == entry)
+ continue;
+ if (exitSuccs->find(*SI) == exitSuccs->end())
+ return false;
+ if (!isCommonDomFrontier(*SI, entry, exit))
+ return false;
+ }
+
+ // Do not allow edges pointing into the region.
+ for (typename DST::iterator SI = exitSuccs->begin(), SE = exitSuccs->end();
+ SI != SE; ++SI) {
+ if (DT->properlyDominates(entry, *SI) && *SI != exit)
+ return false;
+ }
+
+ return true;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::insertShortCut(BlockT *entry, BlockT *exit,
+ BBtoBBMap *ShortCut) const {
+ assert(entry && exit && "entry and exit must not be null!");
+
+ typename BBtoBBMap::iterator e = ShortCut->find(exit);
+
+ if (e == ShortCut->end())
+ // No further region at exit available.
+ (*ShortCut)[entry] = exit;
+ else {
+ // We found a region e that starts at exit. Therefore (entry, e->second)
+ // is also a region, that is larger than (entry, exit). Insert the
+ // larger one.
+ BlockT *BB = e->second;
+ (*ShortCut)[entry] = BB;
+ }
+}
+
+template <class Tr>
+typename Tr::DomTreeNodeT *
+RegionInfoBase<Tr>::getNextPostDom(DomTreeNodeT *N, BBtoBBMap *ShortCut) const {
+ typename BBtoBBMap::iterator e = ShortCut->find(N->getBlock());
+
+ if (e == ShortCut->end())
+ return N->getIDom();
+
+ return PDT->getNode(e->second)->getIDom();
+}
+
+template <class Tr>
+bool RegionInfoBase<Tr>::isTrivialRegion(BlockT *entry, BlockT *exit) const {
+ assert(entry && exit && "entry and exit must not be null!");
+
+ unsigned num_successors =
+ BlockTraits::child_end(entry) - BlockTraits::child_begin(entry);
+
+ if (num_successors <= 1 && exit == *(BlockTraits::child_begin(entry)))
+ return true;
+
+ return false;
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionInfoBase<Tr>::createRegion(BlockT *entry,
+ BlockT *exit) {
+ assert(entry && exit && "entry and exit must not be null!");
+
+ if (isTrivialRegion(entry, exit))
+ return nullptr;
+
+ RegionT *region =
+ new RegionT(entry, exit, static_cast<RegionInfoT *>(this), DT);
+ BBtoRegion.insert(std::make_pair(entry, region));
+
+#ifdef XDEBUG
+ region->verifyRegion();
+#else
+ DEBUG(region->verifyRegion());
+#endif
+
+ updateStatistics(region);
+ return region;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::findRegionsWithEntry(BlockT *entry,
+ BBtoBBMap *ShortCut) {
+ assert(entry);
+
+ DomTreeNodeT *N = PDT->getNode(entry);
+ if (!N)
+ return;
+
+ RegionT *lastRegion = nullptr;
+ BlockT *lastExit = entry;
+
+ // As only a BasicBlock that postdominates entry can finish a region, walk the
+ // post dominance tree upwards.
+ while ((N = getNextPostDom(N, ShortCut))) {
+ BlockT *exit = N->getBlock();
+
+ if (!exit)
+ break;
+
+ if (isRegion(entry, exit)) {
+ RegionT *newRegion = createRegion(entry, exit);
+
+ if (lastRegion)
+ newRegion->addSubRegion(lastRegion);
+
+ lastRegion = newRegion;
+ lastExit = exit;
+ }
+
+ // This can never be a region, so stop the search.
+ if (!DT->dominates(entry, exit))
+ break;
+ }
+
+ // Tried to create regions from entry to lastExit. Next time take a
+ // shortcut from entry to lastExit.
+ if (lastExit != entry)
+ insertShortCut(entry, lastExit, ShortCut);
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::scanForRegions(FuncT &F, BBtoBBMap *ShortCut) {
+ typedef typename std::add_pointer<FuncT>::type FuncPtrT;
+ BlockT *entry = GraphTraits<FuncPtrT>::getEntryNode(&F);
+ DomTreeNodeT *N = DT->getNode(entry);
+
+ // Iterate over the dominance tree in post order to start with the small
+ // regions from the bottom of the dominance tree. If the small regions are
+ // detected first, detection of bigger regions is faster, as we can jump
+ // over the small regions.
+ for (po_iterator<DomTreeNodeT *> FI = po_begin(N), FE = po_end(N); FI != FE;
+ ++FI) {
+ findRegionsWithEntry(FI->getBlock(), ShortCut);
+ }
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionInfoBase<Tr>::getTopMostParent(RegionT *region) {
+ while (region->getParent())
+ region = region->getParent();
+
+ return region;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::buildRegionsTree(DomTreeNodeT *N, RegionT *region) {
+ BlockT *BB = N->getBlock();
+
+ // Passed region exit
+ while (BB == region->getExit())
+ region = region->getParent();
+
+ typename BBtoRegionMap::iterator it = BBtoRegion.find(BB);
+
+ // This basic block is a start block of a region. It is already in the
+ // BBtoRegion relation. Only the child basic blocks have to be updated.
+ if (it != BBtoRegion.end()) {
+ RegionT *newRegion = it->second;
+ region->addSubRegion(getTopMostParent(newRegion));
+ region = newRegion;
+ } else {
+ BBtoRegion[BB] = region;
+ }
+
+ for (typename DomTreeNodeT::iterator CI = N->begin(), CE = N->end(); CI != CE;
+ ++CI) {
+ buildRegionsTree(*CI, region);
+ }
+}
+
+#ifdef XDEBUG
+template <class Tr>
+bool RegionInfoBase<Tr>::VerifyRegionInfo = true;
+#else
+template <class Tr>
+bool RegionInfoBase<Tr>::VerifyRegionInfo = false;
+#endif
+
+template <class Tr>
+typename Tr::RegionT::PrintStyle RegionInfoBase<Tr>::printStyle =
+ RegionBase<Tr>::PrintNone;
+
+template <class Tr>
+void RegionInfoBase<Tr>::print(raw_ostream &OS) const {
+ OS << "Region tree:\n";
+ TopLevelRegion->print(OS, true, 0, printStyle);
+ OS << "End region tree\n";
+}
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+template <class Tr>
+void RegionInfoBase<Tr>::dump() const { print(dbgs()); }
+#endif
+
+template <class Tr>
+void RegionInfoBase<Tr>::releaseMemory() {
+ BBtoRegion.clear();
+ if (TopLevelRegion)
+ delete TopLevelRegion;
+ TopLevelRegion = nullptr;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::verifyAnalysis() const {
+ TopLevelRegion->verifyRegionNest();
+}
+
+// Region pass manager support.
+template <class Tr>
+typename Tr::RegionT *RegionInfoBase<Tr>::getRegionFor(BlockT *BB) const {
+ typename BBtoRegionMap::const_iterator I = BBtoRegion.find(BB);
+ return I != BBtoRegion.end() ? I->second : nullptr;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::setRegionFor(BlockT *BB, RegionT *R) {
+ BBtoRegion[BB] = R;
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionInfoBase<Tr>::operator[](BlockT *BB) const {
+ return getRegionFor(BB);
+}
+
+template <class Tr>
+typename RegionInfoBase<Tr>::BlockT *
+RegionInfoBase<Tr>::getMaxRegionExit(BlockT *BB) const {
+ BlockT *Exit = nullptr;
+
+ while (true) {
+ // Get largest region that starts at BB.
+ RegionT *R = getRegionFor(BB);
+ while (R && R->getParent() && R->getParent()->getEntry() == BB)
+ R = R->getParent();
+
+ // Get the single exit of BB.
+ if (R && R->getEntry() == BB)
+ Exit = R->getExit();
+ else if (++BlockTraits::child_begin(BB) == BlockTraits::child_end(BB))
+ Exit = *BlockTraits::child_begin(BB);
+ else // No single exit exists.
+ return Exit;
+
+ // Get largest region that starts at Exit.
+ RegionT *ExitR = getRegionFor(Exit);
+ while (ExitR && ExitR->getParent() &&
+ ExitR->getParent()->getEntry() == Exit)
+ ExitR = ExitR->getParent();
+
+ for (PredIterTy PI = InvBlockTraits::child_begin(Exit),
+ PE = InvBlockTraits::child_end(Exit);
+ PI != PE; ++PI) {
+ if (!R->contains(*PI) && !ExitR->contains(*PI))
+ break;
+ }
+
+ // This stops infinite cycles.
+ if (DT->dominates(Exit, BB))
+ break;
+
+ BB = Exit;
+ }
+
+ return Exit;
+}
+
+template <class Tr>
+typename Tr::RegionT *RegionInfoBase<Tr>::getCommonRegion(RegionT *A,
+ RegionT *B) const {
+ assert(A && B && "One of the Regions is NULL");
+
+ if (A->contains(B))
+ return A;
+
+ while (!B->contains(A))
+ B = B->getParent();
+
+ return B;
+}
+
+template <class Tr>
+typename Tr::RegionT *
+RegionInfoBase<Tr>::getCommonRegion(SmallVectorImpl<RegionT *> &Regions) const {
+ RegionT *ret = Regions.back();
+ Regions.pop_back();
+
+ for (RegionT *R : Regions)
+ ret = getCommonRegion(ret, R);
+
+ return ret;
+}
+
+template <class Tr>
+typename Tr::RegionT *
+RegionInfoBase<Tr>::getCommonRegion(SmallVectorImpl<BlockT *> &BBs) const {
+ RegionT *ret = getRegionFor(BBs.back());
+ BBs.pop_back();
+
+ for (BlockT *BB : BBs)
+ ret = getCommonRegion(ret, getRegionFor(BB));
+
+ return ret;
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::splitBlock(BlockT *NewBB, BlockT *OldBB) {
+ RegionT *R = getRegionFor(OldBB);
+
+ setRegionFor(NewBB, R);
+
+ while (R->getEntry() == OldBB && !R->isTopLevelRegion()) {
+ R->replaceEntry(NewBB);
+ R = R->getParent();
+ }
+
+ setRegionFor(OldBB, R);
+}
+
+template <class Tr>
+void RegionInfoBase<Tr>::calculate(FuncT &F) {
+ typedef typename std::add_pointer<FuncT>::type FuncPtrT;
+
+ // ShortCut a function where for every BB the exit of the largest region
+ // starting with BB is stored. These regions can be threated as single BBS.
+ // This improves performance on linear CFGs.
+ BBtoBBMap ShortCut;
+
+ scanForRegions(F, &ShortCut);
+ BlockT *BB = GraphTraits<FuncPtrT>::getEntryNode(&F);
+ buildRegionsTree(DT->getNode(BB), TopLevelRegion);
+}
+
+#undef DEBUG_TYPE
+
+} // end namespace llvm
+
+#endif
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