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Templatify RegionInfo so it works on MachineBasicBlocks

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-07-19 18:29:29 +00:00
parent fd22980d6b
commit 5e1c96a632
12 changed files with 1739 additions and 1024 deletions
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484
include/llvm/Analysis/RegionInfo.h
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@ -37,21 +37,62 @@
#ifndef LLVM_ANALYSIS_REGIONINFO_H
#define LLVM_ANALYSIS_REGIONINFO_H
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/PostDominators.h"
#include "llvm/Support/Allocator.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Dominators.h"
#include <map>
#include <memory>
#include <set>
namespace llvm {
class Region;
class RegionInfo;
class raw_ostream;
// RegionTraits - Class to be specialized for different users of RegionInfo
// (i.e. BasicBlocks or MachineBasicBlocks). This is only to avoid needing to
// pass around an unreasonable number of template parameters.
template <class FuncT_>
struct RegionTraits {
// FuncT
// BlockT
// RegionT
// RegionNodeT
// RegionInfoT
typedef typename FuncT_::UnknownRegionTypeError BrokenT;
};
class DominatorTree;
class DominanceFrontier;
class Loop;
class LoopInfo;
struct PostDominatorTree;
class raw_ostream;
class Region;
template <class RegionTr>
class RegionBase;
class RegionNode;
class RegionInfo;
template <class RegionTr>
class RegionInfoBase;
template <>
struct RegionTraits<Function> {
typedef Function FuncT;
typedef BasicBlock BlockT;
typedef Region RegionT;
typedef RegionNode RegionNodeT;
typedef RegionInfo RegionInfoT;
typedef DominatorTree DomTreeT;
typedef DomTreeNode DomTreeNodeT;
typedef DominanceFrontier DomFrontierT;
typedef PostDominatorTree PostDomTreeT;
typedef Instruction InstT;
typedef Loop LoopT;
typedef LoopInfo LoopInfoT;
static unsigned getNumSuccessors(BasicBlock *BB) {
return BB->getTerminator()->getNumSuccessors();
}
};
/// @brief Marker class to iterate over the elements of a Region in flat mode.
///
@ -65,11 +106,18 @@ class FlatIt {};
/// @brief A RegionNode represents a subregion or a BasicBlock that is part of a
/// Region.
class RegionNode {
RegionNode(const RegionNode &) LLVM_DELETED_FUNCTION;
const RegionNode &operator=(const RegionNode &) LLVM_DELETED_FUNCTION;
template <class Tr>
class RegionNodeBase {
friend class RegionBase<Tr>;
public:
typedef typename Tr::BlockT BlockT;
typedef typename Tr::RegionT RegionT;
private:
RegionNodeBase(const RegionNodeBase &) LLVM_DELETED_FUNCTION;
const RegionNodeBase &operator=(const RegionNodeBase &) LLVM_DELETED_FUNCTION;
protected:
/// This is the entry basic block that starts this region node. If this is a
/// BasicBlock RegionNode, then entry is just the basic block, that this
/// RegionNode represents. Otherwise it is the entry of this (Sub)RegionNode.
@ -80,13 +128,13 @@ protected:
/// The node can hold either a Region or a BasicBlock.
/// Use one bit to save, if this RegionNode is a subregion or BasicBlock
/// RegionNode.
PointerIntPair<BasicBlock*, 1, bool> entry;
PointerIntPair<BlockT *, 1, bool> entry;
/// @brief The parent Region of this RegionNode.
/// @see getParent()
Region* parent;
RegionT *parent;
public:
protected:
/// @brief Create a RegionNode.
///
/// @param Parent The parent of this RegionNode.
@ -95,9 +143,11 @@ public:
/// BasicBlock itself. If it represents a subregion, this
/// is the entry BasicBlock of the subregion.
/// @param isSubRegion If this RegionNode represents a SubRegion.
inline RegionNode(Region* Parent, BasicBlock* Entry, bool isSubRegion = 0)
: entry(Entry, isSubRegion), parent(Parent) {}
inline RegionNodeBase(RegionT *Parent, BlockT *Entry,
bool isSubRegion = false)
: entry(Entry, isSubRegion), parent(Parent) {}
public:
/// @brief Get the parent Region of this RegionNode.
///
/// The parent Region is the Region this RegionNode belongs to. If for
@ -106,7 +156,7 @@ public:
/// pointing to the Region this RegionNode belongs to.
///
/// @return Get the parent Region of this RegionNode.
inline Region* getParent() const { return parent; }
inline RegionT *getParent() const { return parent; }
/// @brief Get the entry BasicBlock of this RegionNode.
///
@ -114,7 +164,7 @@ public:
/// itself, otherwise we return the entry BasicBlock of the Subregion
///
/// @return The entry BasicBlock of this RegionNode.
inline BasicBlock* getEntry() const { return entry.getPointer(); }
inline BlockT *getEntry() const { return entry.getPointer(); }
/// @brief Get the content of this RegionNode.
///
@ -122,33 +172,15 @@ public:
/// check the type of the content with the isSubRegion() function call.
///
/// @return The content of this RegionNode.
template<class T>
inline T* getNodeAs() const;
template <class T> inline T *getNodeAs() const;
/// @brief Is this RegionNode a subregion?
///
/// @return True if it contains a subregion. False if it contains a
/// BasicBlock.
inline bool isSubRegion() const {
return entry.getInt();
}
inline bool isSubRegion() const { return entry.getInt(); }
};
/// Print a RegionNode.
inline raw_ostream &operator<<(raw_ostream &OS, const RegionNode &Node);
template<>
inline BasicBlock* RegionNode::getNodeAs<BasicBlock>() const {
assert(!isSubRegion() && "This is not a BasicBlock RegionNode!");
return getEntry();
}
template<>
inline Region* RegionNode::getNodeAs<Region>() const {
assert(isSubRegion() && "This is not a subregion RegionNode!");
return reinterpret_cast<Region*>(const_cast<RegionNode*>(this));
}
//===----------------------------------------------------------------------===//
/// @brief A single entry single exit Region.
///
@ -211,37 +243,53 @@ inline Region* RegionNode::getNodeAs<Region>() const {
///
/// The first call returns a textual representation of the program structure
/// tree, the second one creates a graphical representation using graphviz.
class Region : public RegionNode {
friend class RegionInfo;
Region(const Region &) LLVM_DELETED_FUNCTION;
const Region &operator=(const Region &) LLVM_DELETED_FUNCTION;
template <class Tr>
class RegionBase : public RegionNodeBase<Tr> {
typedef typename Tr::FuncT FuncT;
typedef typename Tr::BlockT BlockT;
typedef typename Tr::RegionInfoT RegionInfoT;
typedef typename Tr::RegionT RegionT;
typedef typename Tr::RegionNodeT RegionNodeT;
typedef typename Tr::DomTreeT DomTreeT;
typedef typename Tr::LoopT LoopT;
typedef typename Tr::LoopInfoT LoopInfoT;
typedef typename Tr::InstT InstT;
typedef GraphTraits<BlockT *> BlockTraits;
typedef GraphTraits<Inverse<BlockT *>> InvBlockTraits;
typedef typename BlockTraits::ChildIteratorType SuccIterTy;
typedef typename InvBlockTraits::ChildIteratorType PredIterTy;
friend class RegionInfoBase<Tr>;
RegionBase(const RegionBase &) LLVM_DELETED_FUNCTION;
const RegionBase &operator=(const RegionBase &) LLVM_DELETED_FUNCTION;
// Information necessary to manage this Region.
RegionInfo* RI;
DominatorTree *DT;
RegionInfoT *RI;
DomTreeT *DT;
// The exit BasicBlock of this region.
// (The entry BasicBlock is part of RegionNode)
BasicBlock *exit;
BlockT *exit;
typedef std::vector<std::unique_ptr<Region>> RegionSet;
typedef std::vector<std::unique_ptr<RegionT>> RegionSet;
// The subregions of this region.
RegionSet children;
typedef std::map<BasicBlock*, RegionNode*> BBNodeMapT;
typedef std::map<BlockT *, RegionNodeT *> BBNodeMapT;
// Save the BasicBlock RegionNodes that are element of this Region.
mutable BBNodeMapT BBNodeMap;
/// verifyBBInRegion - Check if a BB is in this Region. This check also works
/// if the region is incorrectly built. (EXPENSIVE!)
void verifyBBInRegion(BasicBlock* BB) const;
void verifyBBInRegion(BlockT *BB) const;
/// verifyWalk - Walk over all the BBs of the region starting from BB and
/// verify that all reachable basic blocks are elements of the region.
/// (EXPENSIVE!)
void verifyWalk(BasicBlock* BB, std::set<BasicBlock*>* visitedBB) const;
void verifyWalk(BlockT *BB, std::set<BlockT *> *visitedBB) const;
/// verifyRegionNest - Verify if the region and its children are valid
/// regions (EXPENSIVE!)
@ -256,27 +304,27 @@ public:
/// @param DT The dominator tree of the current function.
/// @param Parent The surrounding region or NULL if this is a top level
/// region.
Region(BasicBlock *Entry, BasicBlock *Exit, RegionInfo* RI,
DominatorTree *DT, Region *Parent = nullptr);
RegionBase(BlockT *Entry, BlockT *Exit, RegionInfoT *RI, DomTreeT *DT,
RegionT *Parent = nullptr);
/// Delete the Region and all its subregions.
~Region();
~RegionBase();
/// @brief Get the entry BasicBlock of the Region.
/// @return The entry BasicBlock of the region.
BasicBlock *getEntry() const { return RegionNode::getEntry(); }
BlockT *getEntry() const { return RegionNodeT::getEntry(); }
/// @brief Replace the entry basic block of the region with the new basic
/// block.
///
/// @param BB The new entry basic block of the region.
void replaceEntry(BasicBlock *BB);
void replaceEntry(BlockT *BB);
/// @brief Replace the exit basic block of the region with the new basic
/// block.
///
/// @param BB The new exit basic block of the region.
void replaceExit(BasicBlock *BB);
void replaceExit(BlockT *BB);
/// @brief Recursively replace the entry basic block of the region.
///
@ -285,7 +333,7 @@ public:
/// this region.
///
/// @param NewEntry The new entry basic block.
void replaceEntryRecursive(BasicBlock *NewEntry);
void replaceEntryRecursive(BlockT *NewEntry);
/// @brief Recursively replace the exit basic block of the region.
///
@ -294,22 +342,23 @@ public:
/// this region.
///
/// @param NewExit The new exit basic block.
void replaceExitRecursive(BasicBlock *NewExit);
void replaceExitRecursive(BlockT *NewExit);
/// @brief Get the exit BasicBlock of the Region.
/// @return The exit BasicBlock of the Region, NULL if this is the TopLevel
/// Region.
BasicBlock *getExit() const { return exit; }
BlockT *getExit() const { return exit; }
/// @brief Get the parent of the Region.
/// @return The parent of the Region or NULL if this is a top level
/// Region.
Region *getParent() const { return RegionNode::getParent(); }
RegionT *getParent() const { return RegionNodeT::getParent(); }
/// @brief Get the RegionNode representing the current Region.
/// @return The RegionNode representing the current Region.
RegionNode* getNode() const {
return const_cast<RegionNode*>(reinterpret_cast<const RegionNode*>(this));
RegionNodeT *getNode() const {
return const_cast<RegionNodeT *>(
reinterpret_cast<const RegionNodeT *>(this));
}
/// @brief Get the nesting level of this Region.
@ -330,21 +379,21 @@ public:
/// @return A region also starting at getEntry(), but reaching to the next
/// basic block that forms with getEntry() a (non-canonical) region.
/// NULL if such a basic block does not exist.
Region *getExpandedRegion() const;
RegionT *getExpandedRegion() const;
/// @brief Return the first block of this region's single entry edge,
/// if existing.
///
/// @return The BasicBlock starting this region's single entry edge,
/// else NULL.
BasicBlock *getEnteringBlock() const;
BlockT *getEnteringBlock() const;
/// @brief Return the first block of this region's single exit edge,
/// if existing.
///
/// @return The BasicBlock starting this region's single exit edge,
/// else NULL.
BasicBlock *getExitingBlock() const;
BlockT *getExitingBlock() const;
/// @brief Is this a simple region?
///
@ -358,20 +407,18 @@ public:
std::string getNameStr() const;
/// @brief Return the RegionInfo object, that belongs to this Region.
RegionInfo *getRegionInfo() const {
return RI;
}
RegionInfoT *getRegionInfo() const { return RI; }
/// PrintStyle - Print region in difference ways.
enum PrintStyle { PrintNone, PrintBB, PrintRN };
enum PrintStyle { PrintNone, PrintBB, PrintRN };
/// @brief Print the region.
///
/// @param OS The output stream the Region is printed to.
/// @param printTree Print also the tree of subregions.
/// @param level The indentation level used for printing.
void print(raw_ostream& OS, bool printTree = true, unsigned level = 0,
enum PrintStyle Style = PrintNone) const;
void print(raw_ostream &OS, bool printTree = true, unsigned level = 0,
PrintStyle Style = PrintNone) const;
/// @brief Print the region to stderr.
void dump() const;
@ -380,28 +427,28 @@ public:
///
/// @param BB The BasicBlock that might be contained in this Region.
/// @return True if the block is contained in the region otherwise false.
bool contains(const BasicBlock *BB) const;
bool contains(const BlockT *BB) const;
/// @brief Check if the region contains another region.
///
/// @param SubRegion The region that might be contained in this Region.
/// @return True if SubRegion is contained in the region otherwise false.
bool contains(const Region *SubRegion) const {
bool contains(const RegionT *SubRegion) const {
// Toplevel Region.
if (!getExit())
return true;
return contains(SubRegion->getEntry())
&& (contains(SubRegion->getExit()) || SubRegion->getExit() == getExit());
return contains(SubRegion->getEntry()) &&
(contains(SubRegion->getExit()) ||
SubRegion->getExit() == getExit());
}
/// @brief Check if the region contains an Instruction.
///
/// @param Inst The Instruction that might be contained in this region.
/// @return True if the Instruction is contained in the region otherwise false.
bool contains(const Instruction *Inst) const {
return contains(Inst->getParent());
}
/// @return True if the Instruction is contained in the region otherwise
/// false.
bool contains(const InstT *Inst) const { return contains(Inst->getParent()); }
/// @brief Check if the region contains a loop.
///
@ -410,7 +457,7 @@ public:
/// In case a NULL pointer is passed to this function the result
/// is false, except for the region that describes the whole function.
/// In that case true is returned.
bool contains(const Loop *L) const;
bool contains(const LoopT *L) const;
/// @brief Get the outermost loop in the region that contains a loop.
///
@ -420,7 +467,7 @@ public:
/// @param L The loop the lookup is started.
/// @return The outermost loop in the region, NULL if such a loop does not
/// exist or if the region describes the whole function.
Loop *outermostLoopInRegion(Loop *L) const;
LoopT *outermostLoopInRegion(LoopT *L) const;
/// @brief Get the outermost loop in the region that contains a basic block.
///
@ -431,13 +478,13 @@ public:
/// @param BB The basic block surrounded by the loop.
/// @return The outermost loop in the region, NULL if such a loop does not
/// exist or if the region describes the whole function.
Loop *outermostLoopInRegion(LoopInfo *LI, BasicBlock* BB) const;
LoopT *outermostLoopInRegion(LoopInfoT *LI, BlockT *BB) const;
/// @brief Get the subregion that starts at a BasicBlock
///
/// @param BB The BasicBlock the subregion should start.
/// @return The Subregion if available, otherwise NULL.
Region* getSubRegionNode(BasicBlock *BB) const;
RegionT *getSubRegionNode(BlockT *BB) const;
/// @brief Get the RegionNode for a BasicBlock
///
@ -445,32 +492,32 @@ public:
/// @return If available, the RegionNode that represents the subregion
/// starting at BB. If no subregion starts at BB, the RegionNode
/// representing BB.
RegionNode* getNode(BasicBlock *BB) const;
RegionNodeT *getNode(BlockT *BB) const;
/// @brief Get the BasicBlock RegionNode for a BasicBlock
///
/// @param BB The BasicBlock for which the RegionNode is requested.
/// @return The RegionNode representing the BB.
RegionNode* getBBNode(BasicBlock *BB) const;
RegionNodeT *getBBNode(BlockT *BB) const;
/// @brief Add a new subregion to this Region.
///
/// @param SubRegion The new subregion that will be added.
/// @param moveChildren Move the children of this region, that are also
/// contained in SubRegion into SubRegion.
void addSubRegion(Region *SubRegion, bool moveChildren = false);
void addSubRegion(RegionT *SubRegion, bool moveChildren = false);
/// @brief Remove a subregion from this Region.
///
/// The subregion is not deleted, as it will probably be inserted into another
/// region.
/// @param SubRegion The SubRegion that will be removed.
Region *removeSubRegion(Region *SubRegion);
RegionT *removeSubRegion(RegionT *SubRegion);
/// @brief Move all direct child nodes of this Region to another Region.
///
/// @param To The Region the child nodes will be transferred to.
void transferChildrenTo(Region *To);
void transferChildrenTo(RegionT *To);
/// @brief Verify if the region is a correct region.
///
@ -489,8 +536,8 @@ public:
///
/// These iterators iterator over all subregions of this Region.
//@{
typedef RegionSet::iterator iterator;
typedef RegionSet::const_iterator const_iterator;
typedef typename RegionSet::iterator iterator;
typedef typename RegionSet::const_iterator const_iterator;
iterator begin() { return children.begin(); }
iterator end() { return children.end(); }
@ -507,18 +554,18 @@ public:
//@{
template <bool IsConst>
class block_iterator_wrapper
: public df_iterator<typename std::conditional<IsConst, const BasicBlock,
BasicBlock>::type *> {
typedef df_iterator<typename std::conditional<IsConst, const BasicBlock,
BasicBlock>::type *> super;
: public df_iterator<
typename std::conditional<IsConst, const BlockT, BlockT>::type *> {
typedef df_iterator<
typename std::conditional<IsConst, const BlockT, BlockT>::type *> super;
public:
typedef block_iterator_wrapper<IsConst> Self;
typedef typename super::pointer pointer;
// Construct the begin iterator.
block_iterator_wrapper(pointer Entry, pointer Exit) : super(df_begin(Entry))
{
block_iterator_wrapper(pointer Entry, pointer Exit)
: super(df_begin(Entry)) {
// Mark the exit of the region as visited, so that the children of the
// exit and the exit itself, i.e. the block outside the region will never
// be visited.
@ -526,35 +573,29 @@ public:
}
// Construct the end iterator.
block_iterator_wrapper() : super(df_end<pointer>((BasicBlock *)nullptr)) {}
block_iterator_wrapper() : super(df_end<pointer>((BlockT *)nullptr)) {}
/*implicit*/ block_iterator_wrapper(super I) : super(I) {}
// FIXME: Even a const_iterator returns a non-const BasicBlock pointer.
// This was introduced for backwards compatibility, but should
// be removed as soon as all users are fixed.
BasicBlock *operator*() const {
return const_cast<BasicBlock*>(super::operator*());
BlockT *operator*() const {
return const_cast<BlockT *>(super::operator*());
}
};
typedef block_iterator_wrapper<false> block_iterator;
typedef block_iterator_wrapper<true> const_block_iterator;
typedef block_iterator_wrapper<true> const_block_iterator;
block_iterator block_begin() {
return block_iterator(getEntry(), getExit());
}
block_iterator block_begin() { return block_iterator(getEntry(), getExit()); }
block_iterator block_end() {
return block_iterator();
}
block_iterator block_end() { return block_iterator(); }
const_block_iterator block_begin() const {
return const_block_iterator(getEntry(), getExit());
}
const_block_iterator block_end() const {
return const_block_iterator();
}
const_block_iterator block_end() const { return const_block_iterator(); }
typedef iterator_range<block_iterator> block_range;
typedef iterator_range<const_block_iterator> const_block_range;
@ -578,12 +619,12 @@ public:
/// are direct children of this Region. It does not iterate over any
/// RegionNodes that are also element of a subregion of this Region.
//@{
typedef df_iterator<RegionNode*, SmallPtrSet<RegionNode*, 8>, false,
GraphTraits<RegionNode*> > element_iterator;
typedef df_iterator<RegionNodeT *, SmallPtrSet<RegionNodeT *, 8>, false,
GraphTraits<RegionNodeT *>> element_iterator;
typedef df_iterator<const RegionNode*, SmallPtrSet<const RegionNode*, 8>,
false, GraphTraits<const RegionNode*> >
const_element_iterator;
typedef df_iterator<const RegionNodeT *, SmallPtrSet<const RegionNodeT *, 8>,
false,
GraphTraits<const RegionNodeT *>> const_element_iterator;
element_iterator element_begin();
element_iterator element_end();
@ -593,132 +634,147 @@ public:
//@}
};
/// Print a RegionNode.
template <class Tr>
inline raw_ostream &operator<<(raw_ostream &OS, const RegionNodeBase<Tr> &Node);
//===----------------------------------------------------------------------===//
/// @brief Analysis that detects all canonical Regions.
///
/// The RegionInfo pass detects all canonical regions in a function. The Regions
/// are connected using the parent relation. This builds a Program Structure
/// Tree.
class RegionInfo : public FunctionPass {
typedef DenseMap<BasicBlock*,BasicBlock*> BBtoBBMap;
typedef DenseMap<BasicBlock*, Region*> BBtoRegionMap;
typedef SmallPtrSet<Region*, 4> RegionSet;
template <class Tr>
class RegionInfoBase {
typedef typename Tr::BlockT BlockT;
typedef typename Tr::FuncT FuncT;
typedef typename Tr::RegionT RegionT;
typedef typename Tr::RegionInfoT RegionInfoT;
typedef typename Tr::DomTreeT DomTreeT;
typedef typename Tr::DomTreeNodeT DomTreeNodeT;
typedef typename Tr::PostDomTreeT PostDomTreeT;
typedef typename Tr::DomFrontierT DomFrontierT;
typedef GraphTraits<BlockT *> BlockTraits;
typedef GraphTraits<Inverse<BlockT *>> InvBlockTraits;
typedef typename BlockTraits::ChildIteratorType SuccIterTy;
typedef typename InvBlockTraits::ChildIteratorType PredIterTy;
RegionInfo(const RegionInfo &) LLVM_DELETED_FUNCTION;
const RegionInfo &operator=(const RegionInfo &) LLVM_DELETED_FUNCTION;
friend class RegionInfo;
friend class MachineRegionInfo;
typedef DenseMap<BlockT *, BlockT *> BBtoBBMap;
typedef DenseMap<BlockT *, RegionT *> BBtoRegionMap;
typedef SmallPtrSet<RegionT *, 4> RegionSet;
DominatorTree *DT;
PostDominatorTree *PDT;
DominanceFrontier *DF;
RegionInfoBase();
~RegionInfoBase();
RegionInfoBase(const RegionInfoBase &) LLVM_DELETED_FUNCTION;
const RegionInfoBase &operator=(const RegionInfoBase &) LLVM_DELETED_FUNCTION;
DomTreeT *DT;
PostDomTreeT *PDT;
DomFrontierT *DF;
/// The top level region.
Region *TopLevelRegion;
RegionT *TopLevelRegion;
private:
/// Map every BB to the smallest region, that contains BB.
BBtoRegionMap BBtoRegion;
// isCommonDomFrontier - Returns true if BB is in the dominance frontier of
// entry, because it was inherited from exit. In the other case there is an
// edge going from entry to BB without passing exit.
bool isCommonDomFrontier(BasicBlock* BB, BasicBlock* entry,
BasicBlock* exit) const;
bool isCommonDomFrontier(BlockT *BB, BlockT *entry, BlockT *exit) const;
// isRegion - Check if entry and exit surround a valid region, based on
// dominance tree and dominance frontier.
bool isRegion(BasicBlock* entry, BasicBlock* exit) const;
bool isRegion(BlockT *entry, BlockT *exit) const;
// insertShortCut - Saves a shortcut pointing from entry to exit.
// This function may extend this shortcut if possible.
void insertShortCut(BasicBlock* entry, BasicBlock* exit,
BBtoBBMap* ShortCut) const;
void insertShortCut(BlockT *entry, BlockT *exit, BBtoBBMap *ShortCut) const;
// getNextPostDom - Returns the next BB that postdominates N, while skipping
// all post dominators that cannot finish a canonical region.
DomTreeNode *getNextPostDom(DomTreeNode* N, BBtoBBMap *ShortCut) const;
DomTreeNodeT *getNextPostDom(DomTreeNodeT *N, BBtoBBMap *ShortCut) const;
// isTrivialRegion - A region is trivial, if it contains only one BB.
bool isTrivialRegion(BasicBlock *entry, BasicBlock *exit) const;
bool isTrivialRegion(BlockT *entry, BlockT *exit) const;
// createRegion - Creates a single entry single exit region.
Region *createRegion(BasicBlock *entry, BasicBlock *exit);
RegionT *createRegion(BlockT *entry, BlockT *exit);
// findRegionsWithEntry - Detect all regions starting with bb 'entry'.
void findRegionsWithEntry(BasicBlock *entry, BBtoBBMap *ShortCut);
void findRegionsWithEntry(BlockT *entry, BBtoBBMap *ShortCut);
// scanForRegions - Detects regions in F.
void scanForRegions(Function &F, BBtoBBMap *ShortCut);
void scanForRegions(FuncT &F, BBtoBBMap *ShortCut);
// getTopMostParent - Get the top most parent with the same entry block.
Region *getTopMostParent(Region *region);
RegionT *getTopMostParent(RegionT *region);
// buildRegionsTree - build the region hierarchy after all region detected.
void buildRegionsTree(DomTreeNode *N, Region *region);
// Calculate - detecte all regions in function and build the region tree.
void Calculate(Function& F);
void releaseMemory() override;
void buildRegionsTree(DomTreeNodeT *N, RegionT *region);
// updateStatistics - Update statistic about created regions.
void updateStatistics(Region *R);
virtual void updateStatistics(RegionT *R) = 0;
// isSimple - Check if a region is a simple region with exactly one entry
// edge and exactly one exit edge.
bool isSimple(Region* R) const;
bool isSimple(RegionT *R) const;
// calculate - detect all regions in function and build the region tree.
void calculate(FuncT &F);
public:
static char ID;
explicit RegionInfo();
static bool VerifyRegionInfo;
static typename RegionT::PrintStyle printStyle;
~RegionInfo();
void print(raw_ostream &OS) const;
void dump() const;
/// @name FunctionPass interface
//@{
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
void print(raw_ostream &OS, const Module *) const override;
void verifyAnalysis() const override;
//@}
void releaseMemory();
/// @brief Get the smallest region that contains a BasicBlock.
///
/// @param BB The basic block.
/// @return The smallest region, that contains BB or NULL, if there is no
/// region containing BB.
Region *getRegionFor(BasicBlock *BB) const;
RegionT *getRegionFor(BlockT *BB) const;
/// @brief Set the smallest region that surrounds a basic block.
///
/// @param BB The basic block surrounded by a region.
/// @param R The smallest region that surrounds BB.
void setRegionFor(BasicBlock *BB, Region *R);
void setRegionFor(BlockT *BB, RegionT *R);
/// @brief A shortcut for getRegionFor().
///
/// @param BB The basic block.
/// @return The smallest region, that contains BB or NULL, if there is no
/// region containing BB.
Region *operator[](BasicBlock *BB) const;
RegionT *operator[](BlockT *BB) const;
/// @brief Return the exit of the maximal refined region, that starts at a
/// BasicBlock.
///
/// @param BB The BasicBlock the refined region starts.
BasicBlock *getMaxRegionExit(BasicBlock *BB) const;
BlockT *getMaxRegionExit(BlockT *BB) const;
/// @brief Find the smallest region that contains two regions.
///
/// @param A The first region.
/// @param B The second region.
/// @return The smallest region containing A and B.
Region *getCommonRegion(Region* A, Region *B) const;
RegionT *getCommonRegion(RegionT *A, RegionT *B) const;
/// @brief Find the smallest region that contains two basic blocks.
///
/// @param A The first basic block.
/// @param B The second basic block.
/// @return The smallest region that contains A and B.
Region* getCommonRegion(BasicBlock* A, BasicBlock *B) const {
RegionT *getCommonRegion(BlockT *A, BlockT *B) const {
return getCommonRegion(getRegionFor(A), getRegionFor(B));
}
@ -726,23 +782,21 @@ public:
///
/// @param Regions A vector of regions.
/// @return The smallest region that contains all regions in Regions.
Region* getCommonRegion(SmallVectorImpl<Region*> &Regions) const;
RegionT *getCommonRegion(SmallVectorImpl<RegionT *> &Regions) const;
/// @brief Find the smallest region that contains a set of basic blocks.
///
/// @param BBs A vector of basic blocks.
/// @return The smallest region that contains all basic blocks in BBS.
Region* getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const;
RegionT *getCommonRegion(SmallVectorImpl<BlockT *> &BBs) const;
Region *getTopLevelRegion() const {
return TopLevelRegion;
}
RegionT *getTopLevelRegion() const { return TopLevelRegion; }
/// @brief Update RegionInfo after a basic block was split.
///
/// @param NewBB The basic block that was created before OldBB.
/// @param OldBB The old basic block.
void splitBlock(BasicBlock* NewBB, BasicBlock *OldBB);
void splitBlock(BlockT *NewBB, BlockT *OldBB);
/// @brief Clear the Node Cache for all Regions.
///
@ -751,14 +805,104 @@ public:
if (TopLevelRegion)
TopLevelRegion->clearNodeCache();
}
void verifyAnalysis() const;
};
inline raw_ostream &operator<<(raw_ostream &OS, const RegionNode &Node) {
if (Node.isSubRegion())
return OS << Node.getNodeAs<Region>()->getNameStr();
else
return OS << Node.getNodeAs<BasicBlock>()->getName();
class Region;
class RegionNode : public RegionNodeBase<RegionTraits<Function>> {
public:
inline RegionNode(Region *Parent, BasicBlock *Entry, bool isSubRegion = false)
: RegionNodeBase<RegionTraits<Function>>(Parent, Entry, isSubRegion) {}
~RegionNode() {}
bool operator==(const Region &RN) const {
return this == reinterpret_cast<const RegionNode *>(&RN);
}
};
class Region : public RegionBase<RegionTraits<Function>> {
public:
Region(BasicBlock *Entry, BasicBlock *Exit, RegionInfo *RI, DominatorTree *DT,
Region *Parent = nullptr);
~Region();
bool operator==(const RegionNode &RN) const {
return &RN == reinterpret_cast<const RegionNode *>(this);
}
};
class RegionInfo : public RegionInfoBase<RegionTraits<Function>> {
public:
explicit RegionInfo();
virtual ~RegionInfo();
// updateStatistics - Update statistic about created regions.
void updateStatistics(Region *R) final;
void recalculate(Function &F, DominatorTree *DT, PostDominatorTree *PDT,
DominanceFrontier *DF);
};
class RegionInfoPass : public FunctionPass {
RegionInfo RI;
public:
static char ID;
explicit RegionInfoPass();
~RegionInfoPass();
RegionInfo &getRegionInfo() { return RI; }
const RegionInfo &getRegionInfo() const { return RI; }
/// @name FunctionPass interface
//@{
bool runOnFunction(Function &F) override;
void releaseMemory() override;
void verifyAnalysis() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
void print(raw_ostream &OS, const Module *) const override;
void dump() const;
//@}
};
template <>
template <>
inline BasicBlock *
RegionNodeBase<RegionTraits<Function>>::getNodeAs<BasicBlock>() const {
assert(!isSubRegion() && "This is not a BasicBlock RegionNode!");
return getEntry();
}
template <>
template <>
inline Region *
RegionNodeBase<RegionTraits<Function>>::getNodeAs<Region>() const {
assert(isSubRegion() && "This is not a subregion RegionNode!");
auto Unconst = const_cast<RegionNodeBase<RegionTraits<Function>> *>(this);
return reinterpret_cast<Region *>(Unconst);
}
template <class Tr>
inline raw_ostream &operator<<(raw_ostream &OS,
const RegionNodeBase<Tr> &Node) {
typedef typename Tr::BlockT BlockT;
typedef typename Tr::RegionT RegionT;
if (Node.isSubRegion())
return OS << Node.template getNodeAs<RegionT>()->getNameStr();
else
return OS << Node.template getNodeAs<BlockT>()->getName();
}
EXTERN_TEMPLATE_INSTANTIATION(class RegionBase<RegionTraits<Function>>);
EXTERN_TEMPLATE_INSTANTIATION(class RegionNodeBase<RegionTraits<Function>>);
EXTERN_TEMPLATE_INSTANTIATION(class RegionInfoBase<RegionTraits<Function>>);
} // End llvm namespace
#endif

919
include/llvm/Analysis/RegionInfoImpl.h Normal file
View File

@ -0,0 +1,919 @@
//===- 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/Analysis/RegionInfo.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/PostDominators.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>
using 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);
}
#endif

119
include/llvm/Analysis/RegionIterator.h
View File

@ -30,13 +30,16 @@ namespace llvm {
///
/// For a subregion RegionNode there is just one successor. The RegionNode
/// representing the exit of the subregion.
template<class NodeType>
template<class NodeType, class BlockT, class RegionT>
class RNSuccIterator : public std::iterator<std::forward_iterator_tag,
NodeType, ptrdiff_t>
{
NodeType, ptrdiff_t> {
typedef std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> super;
typedef GraphTraits<BlockT*> BlockTraits;
typedef typename BlockTraits::ChildIteratorType SuccIterTy;
// The iterator works in two modes, bb mode or region mode.
enum ItMode{
enum ItMode {
// In BB mode it returns all successors of this BasicBlock as its
// successors.
ItBB,
@ -47,10 +50,10 @@ class RNSuccIterator : public std::iterator<std::forward_iterator_tag,
};
// Use two bit to represent the mode iterator.
PointerIntPair<NodeType*, 2, enum ItMode> Node;
PointerIntPair<NodeType*, 2, ItMode> Node;
// The block successor iterator.
succ_iterator BItor;
SuccIterTy BItor;
// advanceRegionSucc - A region node has only one successor. It reaches end
// once we advance it.
@ -66,37 +69,36 @@ class RNSuccIterator : public std::iterator<std::forward_iterator_tag,
// Get the immediate successor. This function may return a Basic Block
// RegionNode or a subregion RegionNode.
RegionNode* getISucc(BasicBlock* BB) const {
RegionNode *succ;
NodeType* getISucc(BlockT* BB) const {
NodeType *succ;
succ = getNode()->getParent()->getNode(BB);
assert(succ && "BB not in Region or entered subregion!");
return succ;
}
// getRegionSucc - Return the successor basic block of a SubRegion RegionNode.
inline BasicBlock* getRegionSucc() const {
inline BlockT* getRegionSucc() const {
assert(Node.getInt() == ItRgBegin && "Cannot get the region successor!");
return getNode()->template getNodeAs<Region>()->getExit();
return getNode()->template getNodeAs<RegionT>()->getExit();
}
// isExit - Is this the exit BB of the Region?
inline bool isExit(BasicBlock* BB) const {
inline bool isExit(BlockT* BB) const {
return getNode()->getParent()->getExit() == BB;
}
public:
typedef RNSuccIterator<NodeType> Self;
typedef RNSuccIterator<NodeType, BlockT, RegionT> Self;
typedef typename super::pointer pointer;
/// @brief Create begin iterator of a RegionNode.
inline RNSuccIterator(NodeType* node)
: Node(node, node->isSubRegion() ? ItRgBegin : ItBB),
BItor(succ_begin(node->getEntry())) {
BItor(BlockTraits::child_begin(node->getEntry())) {
// Skip the exit block
if (!isRegionMode())
while (succ_end(node->getEntry()) != BItor && isExit(*BItor))
while (BlockTraits::child_end(node->getEntry()) != BItor && isExit(*BItor))
++BItor;
if (isRegionMode() && isExit(getRegionSucc()))
@ -106,7 +108,7 @@ public:
/// @brief Create an end iterator.
inline RNSuccIterator(NodeType* node, bool)
: Node(node, node->isSubRegion() ? ItRgEnd : ItBB),
BItor(succ_end(node->getEntry())) {}
BItor(BlockTraits::child_end(node->getEntry())) {}
inline bool operator==(const Self& x) const {
assert(isRegionMode() == x.isRegionMode() && "Broken iterator!");
@ -119,7 +121,7 @@ public:
inline bool operator!=(const Self& x) const { return !operator==(x); }
inline pointer operator*() const {
BasicBlock* BB = isRegionMode() ? getRegionSucc() : *BItor;
BlockT *BB = isRegionMode() ? getRegionSucc() : *BItor;
assert(!isExit(BB) && "Iterator out of range!");
return getISucc(BB);
}
@ -132,7 +134,7 @@ public:
// Skip the exit.
do
++BItor;
while (BItor != succ_end(getNode()->getEntry())
while (BItor != BlockTraits::child_end(getNode()->getEntry())
&& isExit(*BItor));
}
return *this;
@ -162,36 +164,41 @@ public:
/// The Flat Region iterator will iterate over all BasicBlock RegionNodes that
/// are contained in the Region and its subregions. This is close to a virtual
/// control flow graph of the Region.
template<class NodeType>
class RNSuccIterator<FlatIt<NodeType> >
: public std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t>
{
template<class NodeType, class BlockT, class RegionT>
class RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>
: public std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> {
typedef std::iterator<std::forward_iterator_tag, NodeType, ptrdiff_t> super;
typedef GraphTraits<BlockT*> BlockTraits;
typedef typename BlockTraits::ChildIteratorType SuccIterTy;
NodeType* Node;
succ_iterator Itor;
SuccIterTy Itor;
public:
typedef RNSuccIterator<FlatIt<NodeType> > Self;
typedef RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT> Self;
typedef typename super::pointer pointer;
/// @brief Create the iterator from a RegionNode.
///
/// Note that the incoming node must be a bb node, otherwise it will trigger
/// an assertion when we try to get a BasicBlock.
inline RNSuccIterator(NodeType* node) : Node(node),
Itor(succ_begin(node->getEntry())) {
inline RNSuccIterator(NodeType* node) :
Node(node),
Itor(BlockTraits::child_begin(node->getEntry())) {
assert(!Node->isSubRegion()
&& "Subregion node not allowed in flat iterating mode!");
assert(Node->getParent() && "A BB node must have a parent!");
// Skip the exit block of the iterating region.
while (succ_end(Node->getEntry()) != Itor
while (BlockTraits::child_end(Node->getEntry()) != Itor
&& Node->getParent()->getExit() == *Itor)
++Itor;
}
/// @brief Create an end iterator
inline RNSuccIterator(NodeType* node, bool) : Node(node),
Itor(succ_end(node->getEntry())) {
inline RNSuccIterator(NodeType* node, bool) :
Node(node),
Itor(BlockTraits::child_end(node->getEntry())) {
assert(!Node->isSubRegion()
&& "Subregion node not allowed in flat iterating mode!");
}
@ -206,10 +213,10 @@ public:
inline bool operator!=(const Self& x) const { return !operator==(x); }
inline pointer operator*() const {
BasicBlock* BB = *Itor;
BlockT *BB = *Itor;
// Get the iterating region.
Region* Parent = Node->getParent();
RegionT *Parent = Node->getParent();
// The only case that the successor reaches out of the region is it reaches
// the exit of the region.
@ -245,14 +252,14 @@ public:
}
};
template<class NodeType>
inline RNSuccIterator<NodeType> succ_begin(NodeType* Node) {
return RNSuccIterator<NodeType>(Node);
template<class NodeType, class BlockT, class RegionT>
inline RNSuccIterator<NodeType, BlockT, RegionT> succ_begin(NodeType* Node) {
return RNSuccIterator<NodeType, BlockT, RegionT>(Node);
}
template<class NodeType>
inline RNSuccIterator<NodeType> succ_end(NodeType* Node) {
return RNSuccIterator<NodeType>(Node, true);
template<class NodeType, class BlockT, class RegionT>
inline RNSuccIterator<NodeType, BlockT, RegionT> succ_end(NodeType* Node) {
return RNSuccIterator<NodeType, BlockT, RegionT>(Node, true);
}
//===--------------------------------------------------------------------===//
@ -262,27 +269,27 @@ inline RNSuccIterator<NodeType> succ_end(NodeType* Node) {
// NodeT can either be region node or const region node, otherwise child_begin
// and child_end fail.
#define RegionNodeGraphTraits(NodeT) \
template<> struct GraphTraits<NodeT*> { \
#define RegionNodeGraphTraits(NodeT, BlockT, RegionT) \
template<> struct GraphTraits<NodeT*> { \
typedef NodeT NodeType; \
typedef RNSuccIterator<NodeType> ChildIteratorType; \
typedef RNSuccIterator<NodeType, BlockT, RegionT> ChildIteratorType; \
static NodeType *getEntryNode(NodeType* N) { return N; } \
static inline ChildIteratorType child_begin(NodeType *N) { \
return RNSuccIterator<NodeType>(N); \
return RNSuccIterator<NodeType, BlockT, RegionT>(N); \
} \
static inline ChildIteratorType child_end(NodeType *N) { \
return RNSuccIterator<NodeType>(N, true); \
return RNSuccIterator<NodeType, BlockT, RegionT>(N, true); \
} \
}; \
template<> struct GraphTraits<FlatIt<NodeT*> > { \
template<> struct GraphTraits<FlatIt<NodeT*>> { \
typedef NodeT NodeType; \
typedef RNSuccIterator<FlatIt<NodeT> > ChildIteratorType; \
typedef RNSuccIterator<FlatIt<NodeT>, BlockT, RegionT > ChildIteratorType; \
static NodeType *getEntryNode(NodeType* N) { return N; } \
static inline ChildIteratorType child_begin(NodeType *N) { \
return RNSuccIterator<FlatIt<NodeType> >(N); \
return RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>(N); \
} \
static inline ChildIteratorType child_end(NodeType *N) { \
return RNSuccIterator<FlatIt<NodeType> >(N, true); \
return RNSuccIterator<FlatIt<NodeType>, BlockT, RegionT>(N, true); \
} \
}
@ -315,8 +322,8 @@ template<> struct GraphTraits<FlatIt<RegionT*> > \
} \
}
RegionNodeGraphTraits(RegionNode);
RegionNodeGraphTraits(const RegionNode);
RegionNodeGraphTraits(RegionNode, BasicBlock, Region);
RegionNodeGraphTraits(const RegionNode, BasicBlock, Region);
RegionGraphTraits(Region, RegionNode);
RegionGraphTraits(const Region, const RegionNode);
@ -337,6 +344,22 @@ template <> struct GraphTraits<RegionInfo*>
}
};
template <> struct GraphTraits<RegionInfoPass*>
: public GraphTraits<RegionInfo *> {
typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false,
GraphTraits<FlatIt<NodeType*> > > nodes_iterator;
static NodeType *getEntryNode(RegionInfoPass *RI) {
return GraphTraits<RegionInfo*>::getEntryNode(&RI->getRegionInfo());
}
static nodes_iterator nodes_begin(RegionInfoPass* RI) {
return GraphTraits<RegionInfo*>::nodes_begin(&RI->getRegionInfo());
}
static nodes_iterator nodes_end(RegionInfoPass *RI) {
return GraphTraits<RegionInfo*>::nodes_end(&RI->getRegionInfo());
}
};
} // End namespace llvm
#endif

183
include/llvm/CodeGen/MachineRegionInfo.h Normal file
View File

@ -0,0 +1,183 @@
//===- llvm/CodeGen/MachineRegionInfo.h -------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEREGIONINFO_H
#define LLVM_CODEGEN_MACHINEREGIONINFO_H
#include "llvm/Analysis/RegionInfo.h"
#include "llvm/Analysis/RegionIterator.h"
#include "llvm/CodeGen/MachineDominanceFrontier.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
namespace llvm {
class MachineDominatorTree;
struct MachinePostDominatorTree;
class MachineRegion;
class MachineRegionNode;
class MachineRegionInfo;
template<>
struct RegionTraits<MachineFunction> {
typedef MachineFunction FuncT;
typedef MachineBasicBlock BlockT;
typedef MachineRegion RegionT;
typedef MachineRegionNode RegionNodeT;
typedef MachineRegionInfo RegionInfoT;
typedef MachineDominatorTree DomTreeT;
typedef MachineDomTreeNode DomTreeNodeT;
typedef MachinePostDominatorTree PostDomTreeT;
typedef MachineDominanceFrontier DomFrontierT;
typedef MachineInstr InstT;
typedef MachineLoop LoopT;
typedef MachineLoopInfo LoopInfoT;
static unsigned getNumSuccessors(MachineBasicBlock *BB) {
return BB->succ_size();
}
};
class MachineRegionNode : public RegionNodeBase<RegionTraits<MachineFunction>> {
public:
inline MachineRegionNode(MachineRegion *Parent,
MachineBasicBlock *Entry,
bool isSubRegion = false)
: RegionNodeBase<RegionTraits<MachineFunction>>(Parent, Entry, isSubRegion) {
}
~MachineRegionNode() { }
bool operator==(const MachineRegion &RN) const {
return this == reinterpret_cast<const MachineRegionNode*>(&RN);
}
};
class MachineRegion : public RegionBase<RegionTraits<MachineFunction>> {
public:
MachineRegion(MachineBasicBlock *Entry, MachineBasicBlock *Exit,
MachineRegionInfo* RI,
MachineDominatorTree *DT, MachineRegion *Parent = nullptr);
~MachineRegion();
bool operator==(const MachineRegionNode &RN) const {
return &RN == reinterpret_cast<const MachineRegionNode*>(this);
}
};
class MachineRegionInfo : public RegionInfoBase<RegionTraits<MachineFunction>> {
public:
explicit MachineRegionInfo();
virtual ~MachineRegionInfo();
// updateStatistics - Update statistic about created regions.
void updateStatistics(MachineRegion *R) final;
void recalculate(MachineFunction &F,
MachineDominatorTree *DT,
MachinePostDominatorTree *PDT,
MachineDominanceFrontier *DF);
};
class MachineRegionInfoPass : public MachineFunctionPass {
MachineRegionInfo RI;
public:
static char ID;
explicit MachineRegionInfoPass();
~MachineRegionInfoPass();
MachineRegionInfo &getRegionInfo() {
return RI;
}
const MachineRegionInfo &getRegionInfo() const {
return RI;
}
/// @name MachineFunctionPass interface
//@{
bool runOnMachineFunction(MachineFunction &F) override;
void releaseMemory() override;
void verifyAnalysis() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
void print(raw_ostream &OS, const Module *) const override;
void dump() const;
//@}
};
template <>
template <>
inline MachineBasicBlock* RegionNodeBase<RegionTraits<MachineFunction>>::getNodeAs<MachineBasicBlock>() const {
assert(!isSubRegion() && "This is not a MachineBasicBlock RegionNode!");
return getEntry();
}
template<>
template<>
inline MachineRegion* RegionNodeBase<RegionTraits<MachineFunction>>::getNodeAs<MachineRegion>() const {
assert(isSubRegion() && "This is not a subregion RegionNode!");
auto Unconst = const_cast<RegionNodeBase<RegionTraits<MachineFunction>>*>(this);
return reinterpret_cast<MachineRegion*>(Unconst);
}
RegionNodeGraphTraits(MachineRegionNode, MachineBasicBlock, MachineRegion);
RegionNodeGraphTraits(const MachineRegionNode, MachineBasicBlock, MachineRegion);
RegionGraphTraits(MachineRegion, MachineRegionNode);
RegionGraphTraits(const MachineRegion, const MachineRegionNode);
template <> struct GraphTraits<MachineRegionInfo*>
: public GraphTraits<FlatIt<MachineRegionNode*> > {
typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false,
GraphTraits<FlatIt<NodeType*> > > nodes_iterator;
static NodeType *getEntryNode(MachineRegionInfo *RI) {
return GraphTraits<FlatIt<MachineRegion*> >::getEntryNode(RI->getTopLevelRegion());
}
static nodes_iterator nodes_begin(MachineRegionInfo* RI) {
return nodes_iterator::begin(getEntryNode(RI));
}
static nodes_iterator nodes_end(MachineRegionInfo *RI) {
return nodes_iterator::end(getEntryNode(RI));
}
};
template <> struct GraphTraits<MachineRegionInfoPass*>
: public GraphTraits<MachineRegionInfo *> {
typedef df_iterator<NodeType*, SmallPtrSet<NodeType*, 8>, false,
GraphTraits<FlatIt<NodeType*> > > nodes_iterator;
static NodeType *getEntryNode(MachineRegionInfoPass *RI) {
return GraphTraits<MachineRegionInfo*>::getEntryNode(&RI->getRegionInfo());
}
static nodes_iterator nodes_begin(MachineRegionInfoPass* RI) {
return GraphTraits<MachineRegionInfo*>::nodes_begin(&RI->getRegionInfo());
}
static nodes_iterator nodes_end(MachineRegionInfoPass *RI) {
return GraphTraits<MachineRegionInfo*>::nodes_end(&RI->getRegionInfo());
}
};
EXTERN_TEMPLATE_INSTANTIATION(class RegionBase<RegionTraits<MachineFunction>>);
EXTERN_TEMPLATE_INSTANTIATION(class RegionNodeBase<RegionTraits<MachineFunction>>);
EXTERN_TEMPLATE_INSTANTIATION(class RegionInfoBase<RegionTraits<MachineFunction>>);
}
#endif

3
include/llvm/InitializePasses.h
View File

@ -189,6 +189,7 @@ void initializeMachinePostDominatorTreePass(PassRegistry&);
void initializeMachineLICMPass(PassRegistry&);
void initializeMachineLoopInfoPass(PassRegistry&);
void initializeMachineModuleInfoPass(PassRegistry&);
void initializeMachineRegionInfoPassPass(PassRegistry&);
void initializeMachineSchedulerPass(PassRegistry&);
void initializeMachineSinkingPass(PassRegistry&);
void initializeMachineTraceMetricsPass(PassRegistry&);
@ -227,7 +228,7 @@ void initializePromotePassPass(PassRegistry&);
void initializePruneEHPass(PassRegistry&);
void initializeReassociatePass(PassRegistry&);
void initializeRegToMemPass(PassRegistry&);
void initializeRegionInfoPass(PassRegistry&);
void initializeRegionInfoPassPass(PassRegistry&);
void initializeRegionOnlyPrinterPass(PassRegistry&);
void initializeRegionOnlyViewerPass(PassRegistry&);
void initializeRegionPrinterPass(PassRegistry&);

2
lib/Analysis/Analysis.cpp
View File

@ -57,7 +57,7 @@ void llvm::initializeAnalysis(PassRegistry &Registry) {
initializeMemoryDependenceAnalysisPass(Registry);
initializeModuleDebugInfoPrinterPass(Registry);
initializePostDominatorTreePass(Registry);
initializeRegionInfoPass(Registry);
initializeRegionInfoPassPass(Registry);
initializeRegionViewerPass(Registry);
initializeRegionPrinterPass(Registry);
initializeRegionOnlyViewerPass(Registry);

854
lib/Analysis/RegionInfo.cpp
View File

@ -10,6 +10,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/RegionInfo.h"
#include "llvm/Analysis/RegionInfoImpl.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/LoopInfo.h"
@ -25,21 +26,26 @@ using namespace llvm;
#define DEBUG_TYPE "region"
// Always verify if expensive checking is enabled.
#ifdef XDEBUG
static bool VerifyRegionInfo = true;
#else
static bool VerifyRegionInfo = false;
#endif
static cl::opt<bool,true>
VerifyRegionInfoX("verify-region-info", cl::location(VerifyRegionInfo),
cl::desc("Verify region info (time consuming)"));
namespace llvm {
template class RegionBase<RegionTraits<Function>>;
template class RegionNodeBase<RegionTraits<Function>>;
template class RegionInfoBase<RegionTraits<Function>>;
}
STATISTIC(numRegions, "The # of regions");
STATISTIC(numSimpleRegions, "The # of simple regions");
static cl::opt<enum Region::PrintStyle> printStyle("print-region-style",
// 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(
@ -49,812 +55,110 @@ static cl::opt<enum Region::PrintStyle> printStyle("print-region-style",
clEnumValN(Region::PrintRN, "rn",
"print regions in detail with element_iterator"),
clEnumValEnd));
//===----------------------------------------------------------------------===//
/// Region Implementation
Region::Region(BasicBlock *Entry, BasicBlock *Exit, RegionInfo* RInfo,
DominatorTree *dt, Region *Parent)
: RegionNode(Parent, Entry, 1), RI(RInfo), DT(dt), exit(Exit) {}
// Region implementation
//
Region::~Region() {
// Free the cached nodes.
for (BBNodeMapT::iterator it = BBNodeMap.begin(),
ie = BBNodeMap.end(); it != ie; ++it)
delete it->second;
Region::Region(BasicBlock *Entry, BasicBlock *Exit,
RegionInfo* RI,
DominatorTree *DT, Region *Parent) :
RegionBase<RegionTraits<Function>>(Entry, Exit, RI, DT, Parent) {
// Only clean the cache for this Region. Caches of child Regions will be
// cleaned when the child Regions are deleted.
BBNodeMap.clear();
}
void Region::replaceEntry(BasicBlock *BB) {
entry.setPointer(BB);
}
void Region::replaceExit(BasicBlock *BB) {
assert(exit && "No exit to replace!");
exit = BB;
}
void Region::replaceEntryRecursive(BasicBlock *NewEntry) {
std::vector<Region *> RegionQueue;
BasicBlock *OldEntry = getEntry();
RegionQueue.push_back(this);
while (!RegionQueue.empty()) {
Region *R = RegionQueue.back();
RegionQueue.pop_back();
R->replaceEntry(NewEntry);
for (Region::const_iterator RI = R->begin(), RE = R->end(); RI != RE; ++RI)
if ((*RI)->getEntry() == OldEntry)
RegionQueue.push_back(RI->get());
}
}
void Region::replaceExitRecursive(BasicBlock *NewExit) {
std::vector<Region *> RegionQueue;
BasicBlock *OldExit = getExit();
RegionQueue.push_back(this);
while (!RegionQueue.empty()) {
Region *R = RegionQueue.back();
RegionQueue.pop_back();
R->replaceExit(NewExit);
for (Region::const_iterator RI = R->begin(), RE = R->end(); RI != RE; ++RI)
if ((*RI)->getExit() == OldExit)
RegionQueue.push_back(RI->get());
}
}
bool Region::contains(const BasicBlock *B) const {
BasicBlock *BB = const_cast<BasicBlock*>(B);
if (!DT->getNode(BB))
return false;
BasicBlock *entry = getEntry(), *exit = getExit();
// Toplevel region.
if (!exit)
return true;
return (DT->dominates(entry, BB)
&& !(DT->dominates(exit, BB) && DT->dominates(entry, exit)));
}
bool Region::contains(const Loop *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<BasicBlock *, 8> ExitingBlocks;
L->getExitingBlocks(ExitingBlocks);
for (SmallVectorImpl<BasicBlock*>::iterator BI = ExitingBlocks.begin(),
BE = ExitingBlocks.end(); BI != BE; ++BI)
if (!contains(*BI))
return false;
return true;
}
Loop *Region::outermostLoopInRegion(Loop *L) const {
if (!contains(L))
return nullptr;
while (L && contains(L->getParentLoop())) {
L = L->getParentLoop();
}
return L;
}
Loop *Region::outermostLoopInRegion(LoopInfo *LI, BasicBlock* BB) const {
assert(LI && BB && "LI and BB cannot be null!");
Loop *L = LI->getLoopFor(BB);
return outermostLoopInRegion(L);
}
BasicBlock *Region::getEnteringBlock() const {
BasicBlock *entry = getEntry();
BasicBlock *Pred;
BasicBlock *enteringBlock = nullptr;
for (pred_iterator PI = pred_begin(entry), PE = pred_end(entry); PI != PE;
++PI) {
Pred = *PI;
if (DT->getNode(Pred) && !contains(Pred)) {
if (enteringBlock)
return nullptr;
enteringBlock = Pred;
}
}
return enteringBlock;
}
BasicBlock *Region::getExitingBlock() const {
BasicBlock *exit = getExit();
BasicBlock *Pred;
BasicBlock *exitingBlock = nullptr;
if (!exit)
return nullptr;
for (pred_iterator PI = pred_begin(exit), PE = pred_end(exit); PI != PE;
++PI) {
Pred = *PI;
if (contains(Pred)) {
if (exitingBlock)
return nullptr;
exitingBlock = Pred;
}
}
return exitingBlock;
}
bool Region::isSimple() const {
return !isTopLevelRegion() && getEnteringBlock() && getExitingBlock();
}
std::string Region::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;
}
void Region::verifyBBInRegion(BasicBlock *BB) const {
if (!contains(BB))
llvm_unreachable("Broken region found!");
BasicBlock *entry = getEntry(), *exit = getExit();
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI)
if (!contains(*SI) && exit != *SI)
llvm_unreachable("Broken region found!");
if (entry != BB)
for (pred_iterator SI = pred_begin(BB), SE = pred_end(BB); SI != SE; ++SI)
if (!contains(*SI))
llvm_unreachable("Broken region found!");
}
void Region::verifyWalk(BasicBlock *BB, std::set<BasicBlock*> *visited) const {
BasicBlock *exit = getExit();
visited->insert(BB);
verifyBBInRegion(BB);
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI)
if (*SI != exit && visited->find(*SI) == visited->end())
verifyWalk(*SI, visited);
}
void Region::verifyRegion() const {
// Only do verification when user wants to, otherwise this expensive
// check will be invoked by PassManager.
if (!VerifyRegionInfo) return;
std::set<BasicBlock*> visited;
verifyWalk(getEntry(), &visited);
}
void Region::verifyRegionNest() const {
for (Region::const_iterator RI = begin(), RE = end(); RI != RE; ++RI)
(*RI)->verifyRegionNest();
verifyRegion();
}
Region::element_iterator Region::element_begin() {
return GraphTraits<Region*>::nodes_begin(this);
}
Region::element_iterator Region::element_end() {
return GraphTraits<Region*>::nodes_end(this);
}
Region::const_element_iterator Region::element_begin() const {
return GraphTraits<const Region*>::nodes_begin(this);
}
Region::const_element_iterator Region::element_end() const {
return GraphTraits<const Region*>::nodes_end(this);
}
Region* Region::getSubRegionNode(BasicBlock *BB) const {
Region *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;
}
RegionNode* Region::getBBNode(BasicBlock *BB) const {
assert(contains(BB) && "Can get BB node out of this region!");
BBNodeMapT::const_iterator at = BBNodeMap.find(BB);
if (at != BBNodeMap.end())
return at->second;
RegionNode *NewNode = new RegionNode(const_cast<Region*>(this), BB);
BBNodeMap.insert(std::make_pair(BB, NewNode));
return NewNode;
}
RegionNode* Region::getNode(BasicBlock *BB) const {
assert(contains(BB) && "Can get BB node out of this region!");
if (Region* Child = getSubRegionNode(BB))
return Child->getNode();
return getBBNode(BB);
}
void Region::transferChildrenTo(Region *To) {
for (iterator I = begin(), E = end(); I != E; ++I) {
(*I)->parent = To;
To->children.push_back(std::move(*I));
}
children.clear();
}
void Region::addSubRegion(Region *SubRegion, bool moveChildren) {
assert(!SubRegion->parent && "SubRegion already has a parent!");
assert(std::find_if(begin(), end(), [&](const std::unique_ptr<Region> &R) {
return R.get() == SubRegion;
}) == children.end() &&
"Subregion already exists!");
SubRegion->parent = this;
children.push_back(std::unique_ptr<Region>(SubRegion));
if (!moveChildren)
return;
assert(SubRegion->children.size() == 0
&& "SubRegions that contain children are not supported");
for (element_iterator I = element_begin(), E = element_end(); I != E; ++I)
if (!(*I)->isSubRegion()) {
BasicBlock *BB = (*I)->getNodeAs<BasicBlock>();
if (SubRegion->contains(BB))
RI->setRegionFor(BB, SubRegion);
}
std::vector<std::unique_ptr<Region>> 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<RegionSet::iterator>(Keep.begin()),
std::move_iterator<RegionSet::iterator>(Keep.end()));
}
Region *Region::removeSubRegion(Region *Child) {
assert(Child->parent == this && "Child is not a child of this region!");
Child->parent = nullptr;
RegionSet::iterator I = std::find_if(
children.begin(), children.end(),
[&](const std::unique_ptr<Region> &R) { return R.get() == Child; });
assert(I != children.end() && "Region does not exit. Unable to remove.");
children.erase(children.begin()+(I-begin()));
return Child;
}
unsigned Region::getDepth() const {
unsigned Depth = 0;
for (Region *R = parent; R != nullptr; R = R->parent)
++Depth;
return Depth;
}
Region *Region::getExpandedRegion() const {
unsigned NumSuccessors = exit->getTerminator()->getNumSuccessors();
if (NumSuccessors == 0)
return nullptr;
for (pred_iterator PI = pred_begin(getExit()), PE = pred_end(getExit());
PI != PE; ++PI)
if (!DT->dominates(getEntry(), *PI))
return nullptr;
Region *R = RI->getRegionFor(exit);
if (R->getEntry() != exit) {
if (exit->getTerminator()->getNumSuccessors() == 1)
return new Region(getEntry(), *succ_begin(exit), RI, DT);
else
return nullptr;
}
while (R->getParent() && R->getParent()->getEntry() == exit)
R = R->getParent();
if (!DT->dominates(getEntry(), R->getExit()))
for (pred_iterator PI = pred_begin(getExit()), PE = pred_end(getExit());
PI != PE; ++PI)
if (!DT->dominates(R->getExit(), *PI))
return nullptr;
return new Region(getEntry(), R->getExit(), RI, DT);
}
void Region::print(raw_ostream &OS, bool print_tree, unsigned level,
enum 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)
void Region::dump() const {
print(dbgs(), true, getDepth(), printStyle.getValue());
}
#endif
void Region::clearNodeCache() {
// Free the cached nodes.
for (BBNodeMapT::iterator I = BBNodeMap.begin(),
IE = BBNodeMap.end(); I != IE; ++I)
delete I->second;
BBNodeMap.clear();
for (Region::iterator RI = begin(), RE = end(); RI != RE; ++RI)
(*RI)->clearNodeCache();
}
Region::~Region() { }
//===----------------------------------------------------------------------===//
// RegionInfo implementation
//
bool RegionInfo::isCommonDomFrontier(BasicBlock *BB, BasicBlock *entry,
BasicBlock *exit) const {
for (pred_iterator PI = pred_begin(BB), PE = pred_end(BB); PI != PE; ++PI) {
BasicBlock *P = *PI;
if (DT->dominates(entry, P) && !DT->dominates(exit, P))
return false;
}
return true;
RegionInfo::RegionInfo() :
RegionInfoBase<RegionTraits<Function>>() {
}
bool RegionInfo::isRegion(BasicBlock *entry, BasicBlock *exit) const {
assert(entry && exit && "entry and exit must not be null!");
typedef DominanceFrontier::DomSetType DST;
RegionInfo::~RegionInfo() {
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 (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 (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 (DST::iterator SI = exitSuccs->begin(), SE = exitSuccs->end();
SI != SE; ++SI)
if (DT->properlyDominates(entry, *SI) && *SI != exit)
return false;
return true;
}
void RegionInfo::insertShortCut(BasicBlock *entry, BasicBlock *exit,
BBtoBBMap *ShortCut) const {
assert(entry && exit && "entry and exit must not be null!");
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.
BasicBlock *BB = e->second;
(*ShortCut)[entry] = BB;
}
}
DomTreeNode* RegionInfo::getNextPostDom(DomTreeNode* N,
BBtoBBMap *ShortCut) const {
BBtoBBMap::iterator e = ShortCut->find(N->getBlock());
if (e == ShortCut->end())
return N->getIDom();
return PDT->getNode(e->second)->getIDom();
}
bool RegionInfo::isTrivialRegion(BasicBlock *entry, BasicBlock *exit) const {
assert(entry && exit && "entry and exit must not be null!");
unsigned num_successors = succ_end(entry) - succ_begin(entry);
if (num_successors <= 1 && exit == *(succ_begin(entry)))
return true;
return false;
}
void RegionInfo::updateStatistics(Region *R) {
++numRegions;
// TODO: Slow. Should only be enabled if -stats is used.
if (R->isSimple()) ++numSimpleRegions;
if (R->isSimple())
++numSimpleRegions;
}
Region *RegionInfo::createRegion(BasicBlock *entry, BasicBlock *exit) {
assert(entry && exit && "entry and exit must not be null!");
void RegionInfo::RegionInfo::recalculate(Function &F,
DominatorTree *DT_,
PostDominatorTree *PDT_,
DominanceFrontier *DF_) {
DT = DT_;
PDT = PDT_;
DF = DF_;
if (isTrivialRegion(entry, exit))
return nullptr;
Region *region = new Region(entry, exit, this, DT);
BBtoRegion.insert(std::make_pair(entry, region));
#ifdef XDEBUG
region->verifyRegion();
#else
DEBUG(region->verifyRegion());
#endif
updateStatistics(region);
return region;
}
void RegionInfo::findRegionsWithEntry(BasicBlock *entry, BBtoBBMap *ShortCut) {
assert(entry);
DomTreeNode *N = PDT->getNode(entry);
if (!N)
return;
Region *lastRegion= nullptr;
BasicBlock *lastExit = entry;
// As only a BasicBlock that postdominates entry can finish a region, walk the
// post dominance tree upwards.
while ((N = getNextPostDom(N, ShortCut))) {
BasicBlock *exit = N->getBlock();
if (!exit)
break;
if (isRegion(entry, exit)) {
Region *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);
}
void RegionInfo::scanForRegions(Function &F, BBtoBBMap *ShortCut) {
BasicBlock *entry = &(F.getEntryBlock());
DomTreeNode *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<DomTreeNode*> FI = po_begin(N), FE = po_end(N); FI != FE;
++FI) {
findRegionsWithEntry(FI->getBlock(), ShortCut);
}
}
Region *RegionInfo::getTopMostParent(Region *region) {
while (region->parent)
region = region->getParent();
return region;
}
void RegionInfo::buildRegionsTree(DomTreeNode *N, Region *region) {
BasicBlock *BB = N->getBlock();
// Passed region exit
while (BB == region->getExit())
region = region->getParent();
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()) {
Region *newRegion = it->second;
region->addSubRegion(getTopMostParent(newRegion));
region = newRegion;
} else {
BBtoRegion[BB] = region;
}
for (DomTreeNode::iterator CI = N->begin(), CE = N->end(); CI != CE; ++CI)
buildRegionsTree(*CI, region);
}
void RegionInfo::releaseMemory() {
BBtoRegion.clear();
if (TopLevelRegion)
delete TopLevelRegion;
TopLevelRegion = nullptr;
}
RegionInfo::RegionInfo() : FunctionPass(ID) {
initializeRegionInfoPass(*PassRegistry::getPassRegistry());
TopLevelRegion = nullptr;
}
RegionInfo::~RegionInfo() {
releaseMemory();
}
void RegionInfo::Calculate(Function &F) {
// 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);
BasicBlock *BB = &F.getEntryBlock();
buildRegionsTree(DT->getNode(BB), TopLevelRegion);
}
bool RegionInfo::runOnFunction(Function &F) {
releaseMemory();
DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
PDT = &getAnalysis<PostDominatorTree>();
DF = &getAnalysis<DominanceFrontier>();
TopLevelRegion = new Region(&F.getEntryBlock(), nullptr, this, DT, nullptr);
TopLevelRegion = new Region(&F.getEntryBlock(), nullptr,
this, DT, nullptr);
updateStatistics(TopLevelRegion);
calculate(F);
}
Calculate(F);
//===----------------------------------------------------------------------===//
// RegionInfoPass implementation
//
RegionInfoPass::RegionInfoPass() : FunctionPass(ID) {
initializeRegionInfoPassPass(*PassRegistry::getPassRegistry());
}
RegionInfoPass::~RegionInfoPass() {
}
bool RegionInfoPass::runOnFunction(Function &F) {
releaseMemory();
auto DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
auto PDT = &getAnalysis<PostDominatorTree>();
auto DF = &getAnalysis<DominanceFrontier>();
RI.recalculate(F, DT, PDT, DF);
return false;
}
void RegionInfo::getAnalysisUsage(AnalysisUsage &AU) const {
void RegionInfoPass::releaseMemory() {
RI.releaseMemory();
}
void RegionInfoPass::verifyAnalysis() const {
RI.verifyAnalysis();
}
void RegionInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequiredTransitive<DominatorTreeWrapperPass>();
AU.addRequired<PostDominatorTree>();
AU.addRequired<DominanceFrontier>();
}
void RegionInfo::print(raw_ostream &OS, const Module *) const {
OS << "Region tree:\n";
TopLevelRegion->print(OS, true, 0, printStyle.getValue());
OS << "End region tree\n";
void RegionInfoPass::print(raw_ostream &OS, const Module *) const {
RI.print(OS);
}
void RegionInfo::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 (!VerifyRegionInfo) return;
TopLevelRegion->verifyRegionNest();
void RegionInfoPass::dump() const {
RI.dump();
}
// Region pass manager support.
Region *RegionInfo::getRegionFor(BasicBlock *BB) const {
BBtoRegionMap::const_iterator I=
BBtoRegion.find(BB);
return I != BBtoRegion.end() ? I->second : nullptr;
}
char RegionInfoPass::ID = 0;
void RegionInfo::setRegionFor(BasicBlock *BB, Region *R) {
BBtoRegion[BB] = R;
}
Region *RegionInfo::operator[](BasicBlock *BB) const {
return getRegionFor(BB);
}
BasicBlock *RegionInfo::getMaxRegionExit(BasicBlock *BB) const {
BasicBlock *Exit = nullptr;
while (true) {
// Get largest region that starts at BB.
Region *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 (++succ_begin(BB) == succ_end(BB))
Exit = *succ_begin(BB);
else // No single exit exists.
return Exit;
// Get largest region that starts at Exit.
Region *ExitR = getRegionFor(Exit);
while (ExitR && ExitR->getParent()
&& ExitR->getParent()->getEntry() == Exit)
ExitR = ExitR->getParent();
for (pred_iterator PI = pred_begin(Exit), PE = pred_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;
}
Region*
RegionInfo::getCommonRegion(Region *A, Region *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;
}
Region*
RegionInfo::getCommonRegion(SmallVectorImpl<Region*> &Regions) const {
Region* ret = Regions.back();
Regions.pop_back();
for (SmallVectorImpl<Region*>::const_iterator I = Regions.begin(),
E = Regions.end(); I != E; ++I)
ret = getCommonRegion(ret, *I);
return ret;
}
Region*
RegionInfo::getCommonRegion(SmallVectorImpl<BasicBlock*> &BBs) const {
Region* ret = getRegionFor(BBs.back());
BBs.pop_back();
for (SmallVectorImpl<BasicBlock*>::const_iterator I = BBs.begin(),
E = BBs.end(); I != E; ++I)
ret = getCommonRegion(ret, getRegionFor(*I));
return ret;
}
void RegionInfo::splitBlock(BasicBlock* NewBB, BasicBlock *OldBB)
{
Region *R = getRegionFor(OldBB);
setRegionFor(NewBB, R);
while (R->getEntry() == OldBB && !R->isTopLevelRegion()) {
R->replaceEntry(NewBB);
R = R->getParent();
}
setRegionFor(OldBB, R);
}
char RegionInfo::ID = 0;
INITIALIZE_PASS_BEGIN(RegionInfo, "regions",
INITIALIZE_PASS_BEGIN(RegionInfoPass, "regions",
"Detect single entry single exit regions", true, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(PostDominatorTree)
INITIALIZE_PASS_DEPENDENCY(DominanceFrontier)
INITIALIZE_PASS_END(RegionInfo, "regions",
INITIALIZE_PASS_END(RegionInfoPass, "regions",
"Detect single entry single exit regions", true, true)
// Create methods available outside of this file, to use them
@ -863,7 +167,7 @@ INITIALIZE_PASS_END(RegionInfo, "regions",
namespace llvm {
FunctionPass *createRegionInfoPass() {
return new RegionInfo();
return new RegionInfoPass();
}
}

4
lib/Analysis/RegionPass.cpp
View File

@ -45,14 +45,14 @@ static void addRegionIntoQueue(Region &R, std::deque<Region *> &RQ) {
/// Pass Manager itself does not invalidate any analysis info.
void RGPassManager::getAnalysisUsage(AnalysisUsage &Info) const {
Info.addRequired<RegionInfo>();
Info.addRequired<RegionInfoPass>();
Info.setPreservesAll();
}
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the function, and if so, return true.
bool RGPassManager::runOnFunction(Function &F) {
RI = &getAnalysis<RegionInfo>();
RI = &getAnalysis<RegionInfoPass>().getRegionInfo();
bool Changed = false;
// Collect inherited analysis from Module level pass manager.

51
lib/Analysis/RegionPrinter.cpp
View File

@ -56,23 +56,24 @@ struct DOTGraphTraits<RegionNode*> : public DefaultDOTGraphTraits {
};
template<>
struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
struct DOTGraphTraits<RegionInfoPass*> : public DOTGraphTraits<RegionNode*> {
DOTGraphTraits (bool isSimple=false)
DOTGraphTraits (bool isSimple = false)
: DOTGraphTraits<RegionNode*>(isSimple) {}
static std::string getGraphName(RegionInfo *DT) {
static std::string getGraphName(RegionInfoPass *DT) {
return "Region Graph";
}
std::string getNodeLabel(RegionNode *Node, RegionInfo *G) {
std::string getNodeLabel(RegionNode *Node, RegionInfoPass *G) {
RegionInfo &RI = G->getRegionInfo();
return DOTGraphTraits<RegionNode*>::getNodeLabel(Node,
G->getTopLevelRegion());
reinterpret_cast<RegionNode*>(RI.getTopLevelRegion()));
}
std::string getEdgeAttributes(RegionNode *srcNode,
GraphTraits<RegionInfo*>::ChildIteratorType CI, RegionInfo *RI) {
GraphTraits<RegionInfo*>::ChildIteratorType CI, RegionInfoPass *G) {
RegionInfo &RI = G->getRegionInfo();
RegionNode *destNode = *CI;
if (srcNode->isSubRegion() || destNode->isSubRegion())
@ -82,7 +83,7 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
BasicBlock *srcBB = srcNode->getNodeAs<BasicBlock>();
BasicBlock *destBB = destNode->getNodeAs<BasicBlock>();
Region *R = RI->getRegionFor(destBB);
Region *R = RI.getRegionFor(destBB);
while (R && R->getParent())
if (R->getParent()->getEntry() == destBB)
@ -98,7 +99,8 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
// Print the cluster of the subregions. This groups the single basic blocks
// and adds a different background color for each group.
static void printRegionCluster(const Region &R, GraphWriter<RegionInfo*> &GW,
static void printRegionCluster(const Region &R,
GraphWriter<RegionInfoPass*> &GW,
unsigned depth = 0) {
raw_ostream &O = GW.getOStream();
O.indent(2 * depth) << "subgraph cluster_" << static_cast<const void*>(&R)
@ -119,22 +121,23 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
for (Region::const_iterator RI = R.begin(), RE = R.end(); RI != RE; ++RI)
printRegionCluster(**RI, GW, depth + 1);
RegionInfo *RI = R.getRegionInfo();
const RegionInfo &RI = *static_cast<const RegionInfo*>(R.getRegionInfo());
for (const auto &BB : R.blocks())
if (RI->getRegionFor(BB) == &R)
if (RI.getRegionFor(BB) == &R)
O.indent(2 * (depth + 1)) << "Node"
<< static_cast<const void*>(RI->getTopLevelRegion()->getBBNode(BB))
<< static_cast<const void*>(RI.getTopLevelRegion()->getBBNode(BB))
<< ";\n";
O.indent(2 * depth) << "}\n";
}
static void addCustomGraphFeatures(const RegionInfo* RI,
GraphWriter<RegionInfo*> &GW) {
static void addCustomGraphFeatures(const RegionInfoPass* RIP,
GraphWriter<RegionInfoPass*> &GW) {
const RegionInfo &RI = RIP->getRegionInfo();
raw_ostream &O = GW.getOStream();
O << "\tcolorscheme = \"paired12\"\n";
printRegionCluster(*RI->getTopLevelRegion(), GW, 4);
printRegionCluster(*RI.getTopLevelRegion(), GW, 4);
}
};
} //end namespace llvm
@ -142,28 +145,28 @@ struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
namespace {
struct RegionViewer
: public DOTGraphTraitsViewer<RegionInfo, false> {
: public DOTGraphTraitsViewer<RegionInfoPass, false> {
static char ID;
RegionViewer() : DOTGraphTraitsViewer<RegionInfo, false>("reg", ID){
RegionViewer() : DOTGraphTraitsViewer<RegionInfoPass, false>("reg", ID){
initializeRegionViewerPass(*PassRegistry::getPassRegistry());
}
};
char RegionViewer::ID = 0;
struct RegionOnlyViewer
: public DOTGraphTraitsViewer<RegionInfo, true> {
: public DOTGraphTraitsViewer<RegionInfoPass, true> {
static char ID;
RegionOnlyViewer() : DOTGraphTraitsViewer<RegionInfo, true>("regonly", ID) {
RegionOnlyViewer() : DOTGraphTraitsViewer<RegionInfoPass, true>("regonly", ID) {
initializeRegionOnlyViewerPass(*PassRegistry::getPassRegistry());
}
};
char RegionOnlyViewer::ID = 0;
struct RegionPrinter
: public DOTGraphTraitsPrinter<RegionInfo, false> {
: public DOTGraphTraitsPrinter<RegionInfoPass, false> {
static char ID;
RegionPrinter() :
DOTGraphTraitsPrinter<RegionInfo, false>("reg", ID) {
DOTGraphTraitsPrinter<RegionInfoPass, false>("reg", ID) {
initializeRegionPrinterPass(*PassRegistry::getPassRegistry());
}
};
@ -175,7 +178,7 @@ INITIALIZE_PASS(RegionPrinter, "dot-regions",
INITIALIZE_PASS(RegionViewer, "view-regions", "View regions of function",
true, true)
INITIALIZE_PASS(RegionOnlyViewer, "view-regions-only",
"View regions of function (with no function bodies)",
true, true)
@ -183,10 +186,10 @@ INITIALIZE_PASS(RegionOnlyViewer, "view-regions-only",
namespace {
struct RegionOnlyPrinter
: public DOTGraphTraitsPrinter<RegionInfo, true> {
: public DOTGraphTraitsPrinter<RegionInfoPass, true> {
static char ID;
RegionOnlyPrinter() :
DOTGraphTraitsPrinter<RegionInfo, true>("reg", ID) {
DOTGraphTraitsPrinter<RegionInfoPass, true>("reg", ID) {
initializeRegionOnlyPrinterPass(*PassRegistry::getPassRegistry());
}
};

1
lib/CodeGen/CMakeLists.txt
View File

@ -65,6 +65,7 @@ add_llvm_library(LLVMCodeGen
MachinePassRegistry.cpp
MachinePostDominators.cpp
MachineRegisterInfo.cpp
MachineRegionInfo.cpp
MachineSSAUpdater.cpp
MachineScheduler.cpp
MachineSink.cpp

137
lib/CodeGen/MachineRegionInfo.cpp Normal file
View File

@ -0,0 +1,137 @@
#include "llvm/CodeGen/MachineRegionInfo.h"
#include "llvm/CodeGen/MachinePostDominators.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/RegionInfoImpl.h"
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>>;
}
//===----------------------------------------------------------------------===//
// MachineRegion implementation
//
MachineRegion::MachineRegion(MachineBasicBlock *Entry, MachineBasicBlock *Exit,
MachineRegionInfo* RI,
MachineDominatorTree *DT, MachineRegion *Parent) :
RegionBase<RegionTraits<MachineFunction>>(Entry, Exit, RI, DT, Parent) {
}
MachineRegion::~MachineRegion() { }
//===----------------------------------------------------------------------===//
// MachineRegionInfo implementation
//
MachineRegionInfo::MachineRegionInfo() :
RegionInfoBase<RegionTraits<MachineFunction>>() {
}
MachineRegionInfo::~MachineRegionInfo() {
}
void MachineRegionInfo::updateStatistics(MachineRegion *R) {
++numMachineRegions;
// TODO: Slow. Should only be enabled if -stats is used.
if (R->isSimple())
++numMachineSimpleRegions;
}
void MachineRegionInfo::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() {
}
bool MachineRegionInfoPass::runOnMachineFunction(MachineFunction &F) {
releaseMemory();
auto DT = &getAnalysis<MachineDominatorTree>();
auto PDT = &getAnalysis<MachinePostDominatorTree>();
auto DF = &getAnalysis<MachineDominanceFrontier>();
RI.recalculate(F, DT, PDT, DF);
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.addRequiredTransitive<DominatorTreeWrapperPass>();
AU.addRequired<PostDominatorTree>();
AU.addRequired<DominanceFrontier>();
}
void MachineRegionInfoPass::print(raw_ostream &OS, const Module *) const {
RI.print(OS);
}
void MachineRegionInfoPass::dump() const {
RI.dump();
}
char MachineRegionInfoPass::ID = 0;
INITIALIZE_PASS_BEGIN(MachineRegionInfoPass, "regions",
"Detect single entry single exit regions", true, true)
INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)
INITIALIZE_PASS_DEPENDENCY(MachinePostDominatorTree)
INITIALIZE_PASS_DEPENDENCY(MachineDominanceFrontier)
INITIALIZE_PASS_END(MachineRegionInfoPass, "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 *createMachineRegionInfoPass() {
return new MachineRegionInfoPass();
}
}

6
lib/Transforms/Scalar/StructurizeCFG.cpp
View File

@ -260,7 +260,7 @@ INITIALIZE_PASS_BEGIN(StructurizeCFG, "structurizecfg", "Structurize the CFG",
false, false)
INITIALIZE_PASS_DEPENDENCY(LowerSwitch)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(RegionInfo)
INITIALIZE_PASS_DEPENDENCY(RegionInfoPass)
INITIALIZE_PASS_END(StructurizeCFG, "structurizecfg", "Structurize the CFG",
false, false)
@ -406,11 +406,11 @@ void StructurizeCFG::gatherPredicates(RegionNode *N) {
} else {
// It's an exit from a sub region
while(R->getParent() != ParentRegion)
while (R->getParent() != ParentRegion)
R = R->getParent();
// Edge from inside a subregion to its entry, ignore it
if (R == N)
if (*R == *N)
continue;
BasicBlock *Entry = R->getEntry();