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Add new anaysis routines for building dominator related information
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
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include/llvm/Analysis/Dominators.h
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190
include/llvm/Analysis/Dominators.h
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//===- llvm/Analysis/DominatorSet.h - Dominator Set Calculation --*- C++ -*--=//
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//
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// This file defines the following classes:
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// 1. DominatorSet: Calculates the [reverse] dominator set for a method
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// 2. ImmediateDominators: Calculates and holds the immediate dominator tree
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// for a method.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DOMINATOR_SET_H
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#define LLVM_DOMINATOR_SET_H
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#include <set>
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#include <map>
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#include <vector>
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class Method;
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class BasicBlock;
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namespace cfg {
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//===----------------------------------------------------------------------===//
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//
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// DominatorSet - Maintain a set<const BasicBlock*> for every basic block in a
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// method, that represents the blocks that dominate the block.
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//
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class DominatorSet {
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public:
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typedef set<const BasicBlock*> DomSetType; // Dom set for a bb
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typedef map<const BasicBlock *, DomSetType> DomSetMapType; // Map of dom sets
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private:
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DomSetMapType Doms;
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const BasicBlock *Root;
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public:
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// DominatorSet ctor - Build either the dominator set or the post-dominator
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// set for a method...
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//
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DominatorSet(const Method *M, bool PostDomSet = false);
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// Accessor interface:
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typedef DomSetMapType::const_iterator const_iterator;
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inline const_iterator begin() const { return Doms.begin(); }
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inline const_iterator end() const { return Doms.end(); }
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inline const_iterator find(const BasicBlock* B) const { return Doms.find(B); }
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inline const BasicBlock *getRoot() const { return Root; }
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// getDominators - Return the set of basic blocks that dominate the specified
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// block.
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//
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inline const DomSetType &getDominators(const BasicBlock *BB) const {
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const_iterator I = find(BB);
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assert(I != end() && "BB not in method!");
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return I->second;
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}
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// dominates - Return true if A dominates B.
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//
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inline bool dominates(const BasicBlock *A, const BasicBlock *B) const {
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return getDominators(B).count(A) != 0;
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}
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};
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//===----------------------------------------------------------------------===//
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//
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// ImmediateDominators - Calculate the immediate dominator for each node in a
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// method.
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//
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class ImmediateDominators {
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map<const BasicBlock*, const BasicBlock*> IDoms;
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const BasicBlock *Root;
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void calcIDoms(const DominatorSet &DS);
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public:
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// ImmediateDominators ctor - Calculate the idom mapping, for a method, or
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// from a dominator set calculated for something else...
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//
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inline ImmediateDominators(const DominatorSet &DS) : Root(DS.getRoot()) {
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calcIDoms(DS); // Can be used to make rev-idoms
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}
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// Accessor interface:
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typedef map<const BasicBlock*, const BasicBlock*> IDomMapType;
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typedef IDomMapType::const_iterator const_iterator;
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inline const_iterator begin() const { return IDoms.begin(); }
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inline const_iterator end() const { return IDoms.end(); }
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inline const_iterator find(const BasicBlock* B) const { return IDoms.find(B);}
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inline const BasicBlock *getRoot() const { return Root; }
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// operator[] - Return the idom for the specified basic block. The start
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// node returns null, because it does not have an immediate dominator.
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//
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inline const BasicBlock *operator[](const BasicBlock *BB) const {
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map<const BasicBlock*, const BasicBlock*>::const_iterator I =
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IDoms.find(BB);
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return I != IDoms.end() ? I->second : 0;
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}
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};
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//===----------------------------------------------------------------------===//
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//
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// DominatorTree - Calculate the immediate dominator tree for a method.
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//
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class DominatorTree {
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class Node;
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const BasicBlock *Root;
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map<const BasicBlock*, Node*> Nodes;
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void calculate(const DominatorSet &DS);
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typedef map<const BasicBlock*, Node*> NodeMapType;
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public:
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class Node : public vector<Node*> {
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friend class DominatorTree;
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const BasicBlock *TheNode;
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Node * const IDom;
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public:
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inline const BasicBlock *getNode() const { return TheNode; }
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inline Node *getIDom() const { return IDom; }
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inline const vector<Node*> &getChildren() const { return *this; }
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// dominates - Returns true iff this dominates N. Note that this is not a
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// constant time operation!
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inline bool dominates(const Node *N) const {
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const Node *IDom;
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while ((IDom = N->getIDom()) != 0 && IDom != this)
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N = IDom; // Walk up the tree
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return IDom != 0;
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}
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private:
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inline Node(const BasicBlock *node, Node *iDom)
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: TheNode(node), IDom(iDom) {}
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inline Node *addChild(Node *C) { push_back(C); return C; }
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};
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public:
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// DominatorTree ctors - Compute a dominator tree, given various amounts of
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// previous knowledge...
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//inline DominatorTree(const Method *M) { calculate(DominatorSet(M)); }
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inline DominatorTree(const DominatorSet &DS) : Root(DS.getRoot()) {
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calculate(DS);
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}
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DominatorTree(const ImmediateDominators &IDoms);
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~DominatorTree();
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inline const BasicBlock *getRoot() const { return Root; }
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inline const Node *operator[](const BasicBlock *BB) const {
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NodeMapType::const_iterator i = Nodes.find(BB);
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return (i != Nodes.end()) ? i->second : 0;
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}
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};
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//===----------------------------------------------------------------------===//
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//
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// DominanceFrontier - Calculate the dominance frontiers for a method.
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//
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class DominanceFrontier {
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typedef set<const BasicBlock*> DomSetType; // Dom set for a bb
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typedef map<const BasicBlock *, DomSetType> DomSetMapType; // Map of dom sets
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private:
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DomSetMapType Frontiers;
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const BasicBlock *Root;
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const DomSetType &calcDomFrontier(const DominatorTree &DT,
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const DominatorTree::Node *Node);
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public:
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DominanceFrontier(const DominatorSet &DS) : Root(DS.getRoot()) {
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const DominatorTree DT(DS);
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calcDomFrontier(DT, DT[Root]);
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}
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DominanceFrontier(const ImmediateDominators &ID) : Root(ID.getRoot()) {
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const DominatorTree DT(ID);
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calcDomFrontier(DT, DT[Root]);
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}
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DominanceFrontier(const DominatorTree &DT) : Root(DT.getRoot()) {
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calcDomFrontier(DT, DT[Root]);
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}
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// Accessor interface:
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typedef DomSetMapType::const_iterator const_iterator;
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inline const_iterator begin() const { return Frontiers.begin(); }
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inline const_iterator end() const { return Frontiers.end(); }
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inline const_iterator find(const BasicBlock* B) const { return Frontiers.find(B);}
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inline const BasicBlock *getRoot() const { return Root; }
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};
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} // End namespace cfg
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#endif
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