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methods * Eliminate AnalysisID: Now it is just a typedef for const PassInfo* * Simplify how AnalysisID's are initialized * Eliminate Analysis/Writer.cpp/.h: incorporate printing functionality into the analyses themselves. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3115 91177308-0d34-0410-b5e6-96231b3b80d8
411 lines
13 KiB
C++
411 lines
13 KiB
C++
//===- llvm/Analysis/Dominators.h - Dominator Info 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 function
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// 2. ImmediateDominators: Calculates and holds a mapping between BasicBlocks
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// and their immediate dominator.
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// 3. DominatorTree: Represent the ImmediateDominator as an explicit tree
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// structure.
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// 4. DominanceFrontier: Calculate and hold the dominance frontier for a
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// function.
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//
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// These data structures are listed in increasing order of complexity. It
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// takes longer to calculate the dominator frontier, for example, than the
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// ImmediateDominator mapping.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DOMINATORS_H
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#define LLVM_DOMINATORS_H
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#include "llvm/Pass.h"
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#include <set>
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class Instruction;
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//===----------------------------------------------------------------------===//
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//
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// DominatorBase - Base class that other, more interesting dominator analyses
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// inherit from.
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//
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class DominatorBase : public FunctionPass {
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protected:
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BasicBlock *Root;
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const bool IsPostDominators;
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inline DominatorBase(bool isPostDom) : Root(0), IsPostDominators(isPostDom) {}
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public:
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inline BasicBlock *getRoot() const { return Root; }
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// Returns true if analysis based of postdoms
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bool isPostDominator() const { return IsPostDominators; }
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};
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//===----------------------------------------------------------------------===//
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//
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// DominatorSet - Maintain a set<BasicBlock*> for every basic block in a
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// function, that represents the blocks that dominate the block.
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//
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class DominatorSetBase : public DominatorBase {
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public:
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typedef std::set<BasicBlock*> DomSetType; // Dom set for a bb
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// Map of dom sets
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typedef std::map<BasicBlock*, DomSetType> DomSetMapType;
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protected:
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DomSetMapType Doms;
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public:
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DominatorSetBase(bool isPostDom) : DominatorBase(isPostDom) {}
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virtual void releaseMemory() { Doms.clear(); }
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// Accessor interface:
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typedef DomSetMapType::const_iterator const_iterator;
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typedef DomSetMapType::iterator iterator;
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inline const_iterator begin() const { return Doms.begin(); }
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inline iterator begin() { return Doms.begin(); }
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inline const_iterator end() const { return Doms.end(); }
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inline iterator end() { return Doms.end(); }
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inline const_iterator find(BasicBlock* B) const { return Doms.find(B); }
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inline iterator find(BasicBlock* B) { return Doms.find(B); }
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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(BasicBlock *BB) const {
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const_iterator I = find(BB);
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assert(I != end() && "BB not in function!");
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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(BasicBlock *A, BasicBlock *B) const {
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return getDominators(B).count(A) != 0;
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}
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// print - Convert to human readable form
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virtual void print(std::ostream &OS) const;
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// dominates - Return true if A dominates B. This performs the special checks
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// neccesary if A and B are in the same basic block.
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//
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bool dominates(Instruction *A, Instruction *B) const;
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};
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//===-------------------------------------
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// DominatorSet Class - Concrete subclass of DominatorSetBase that is used to
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// compute a normal dominator set.
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//
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struct DominatorSet : public DominatorSetBase {
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static AnalysisID ID; // Build dominator set
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DominatorSet() : DominatorSetBase(false) {}
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virtual bool runOnFunction(Function &F);
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// getAnalysisUsage - This simply provides a dominator set
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addProvided(ID);
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}
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};
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//===-------------------------------------
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// DominatorSet Class - Concrete subclass of DominatorSetBase that is used to
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// compute the post-dominator set.
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//
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struct PostDominatorSet : public DominatorSetBase {
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static AnalysisID ID; // Build post-dominator set
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PostDominatorSet() : DominatorSetBase(true) {}
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virtual bool runOnFunction(Function &F);
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// getAnalysisUsage - This obviously provides a dominator set, but it also
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// uses the UnifyFunctionExitNode pass if building post-dominators
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//
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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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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// function.
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//
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class ImmediateDominatorsBase : public DominatorBase {
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protected:
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std::map<BasicBlock*, BasicBlock*> IDoms;
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void calcIDoms(const DominatorSetBase &DS);
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public:
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ImmediateDominatorsBase(bool isPostDom) : DominatorBase(isPostDom) {}
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virtual void releaseMemory() { IDoms.clear(); }
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// Accessor interface:
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typedef std::map<BasicBlock*, 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(BasicBlock* B) const { return IDoms.find(B);}
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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 BasicBlock *operator[](BasicBlock *BB) const {
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std::map<BasicBlock*, BasicBlock*>::const_iterator I = IDoms.find(BB);
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return I != IDoms.end() ? I->second : 0;
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}
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// print - Convert to human readable form
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virtual void print(std::ostream &OS) const;
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};
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//===-------------------------------------
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// ImmediateDominators Class - Concrete subclass of ImmediateDominatorsBase that
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// is used to compute a normal immediate dominator set.
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//
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struct ImmediateDominators : public ImmediateDominatorsBase {
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static AnalysisID ID; // Build immediate dominators
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ImmediateDominators() : ImmediateDominatorsBase(false) {}
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virtual bool runOnFunction(Function &F) {
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IDoms.clear(); // Reset from the last time we were run...
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DominatorSet &DS = getAnalysis<DominatorSet>();
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Root = DS.getRoot();
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calcIDoms(DS);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addProvided(ID);
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AU.addRequired(DominatorSet::ID);
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}
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};
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//===-------------------------------------
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// ImmediatePostDominators Class - Concrete subclass of ImmediateDominatorsBase
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// that is used to compute the immediate post-dominators.
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//
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struct ImmediatePostDominators : public ImmediateDominatorsBase {
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static AnalysisID ID; // Build immediate postdominators
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ImmediatePostDominators() : ImmediateDominatorsBase(true) {}
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virtual bool runOnFunction(Function &F) {
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IDoms.clear(); // Reset from the last time we were run...
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PostDominatorSet &DS = getAnalysis<PostDominatorSet>();
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Root = DS.getRoot();
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calcIDoms(DS);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired(PostDominatorSet::ID);
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AU.addProvided(ID);
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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 function.
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//
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class DominatorTreeBase : public DominatorBase {
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protected:
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class Node2;
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public:
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typedef Node2 Node;
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protected:
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std::map<BasicBlock*, Node*> Nodes;
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void reset();
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typedef std::map<BasicBlock*, Node*> NodeMapType;
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public:
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class Node2 : public std::vector<Node*> {
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friend class DominatorTree;
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friend class PostDominatorTree;
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BasicBlock *TheNode;
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Node2 *IDom;
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public:
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inline BasicBlock *getNode() const { return TheNode; }
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inline Node2 *getIDom() const { return IDom; }
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inline const std::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 Node2 *N) const {
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const Node2 *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 Node2(BasicBlock *node, Node *iDom)
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: TheNode(node), IDom(iDom) {}
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inline Node2 *addChild(Node *C) { push_back(C); return C; }
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};
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public:
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DominatorTreeBase(bool isPostDom) : DominatorBase(isPostDom) {}
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~DominatorTreeBase() { reset(); }
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virtual void releaseMemory() { reset(); }
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inline Node *operator[](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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// print - Convert to human readable form
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virtual void print(std::ostream &OS) const;
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};
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//===-------------------------------------
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// DominatorTree Class - Concrete subclass of DominatorTreeBase that is used to
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// compute a normal dominator tree.
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//
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struct DominatorTree : public DominatorTreeBase {
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static AnalysisID ID; // Build dominator tree
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DominatorTree() : DominatorTreeBase(false) {}
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virtual bool runOnFunction(Function &F) {
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reset(); // Reset from the last time we were run...
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DominatorSet &DS = getAnalysis<DominatorSet>();
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Root = DS.getRoot();
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calculate(DS);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addProvided(ID);
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AU.addRequired(DominatorSet::ID);
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}
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private:
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void calculate(const DominatorSet &DS);
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};
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//===-------------------------------------
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// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
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// compute the a post-dominator tree.
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//
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struct PostDominatorTree : public DominatorTreeBase {
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static AnalysisID ID; // Build immediate postdominators
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PostDominatorTree() : DominatorTreeBase(true) {}
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virtual bool runOnFunction(Function &F) {
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reset(); // Reset from the last time we were run...
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PostDominatorSet &DS = getAnalysis<PostDominatorSet>();
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Root = DS.getRoot();
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calculate(DS);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired(PostDominatorSet::ID);
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AU.addProvided(ID);
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}
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private:
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void calculate(const PostDominatorSet &DS);
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};
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//===----------------------------------------------------------------------===//
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//
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// DominanceFrontier - Calculate the dominance frontiers for a function.
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//
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class DominanceFrontierBase : public DominatorBase {
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public:
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typedef std::set<BasicBlock*> DomSetType; // Dom set for a bb
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typedef std::map<BasicBlock*, DomSetType> DomSetMapType; // Dom set map
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protected:
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DomSetMapType Frontiers;
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public:
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DominanceFrontierBase(bool isPostDom) : DominatorBase(isPostDom) {}
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virtual void releaseMemory() { Frontiers.clear(); }
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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(BasicBlock* B) const { return Frontiers.find(B); }
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// print - Convert to human readable form
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virtual void print(std::ostream &OS) const;
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};
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//===-------------------------------------
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// DominatorTree Class - Concrete subclass of DominatorTreeBase that is used to
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// compute a normal dominator tree.
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//
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struct DominanceFrontier : public DominanceFrontierBase {
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static AnalysisID ID; // Build dominance frontier
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DominanceFrontier() : DominanceFrontierBase(false) {}
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virtual bool runOnFunction(Function &) {
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Frontiers.clear();
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DominatorTree &DT = getAnalysis<DominatorTree>();
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Root = DT.getRoot();
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calculate(DT, DT[Root]);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addProvided(ID);
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AU.addRequired(DominatorTree::ID);
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}
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private:
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const DomSetType &calculate(const DominatorTree &DT,
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const DominatorTree::Node *Node);
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};
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//===-------------------------------------
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// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
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// used to compute the a post-dominance frontier.
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//
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struct PostDominanceFrontier : public DominanceFrontierBase {
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static AnalysisID ID; // Build post dominance frontier
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PostDominanceFrontier() : DominanceFrontierBase(true) {}
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virtual bool runOnFunction(Function &) {
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Frontiers.clear();
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PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
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Root = DT.getRoot();
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calculate(DT, DT[Root]);
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired(PostDominatorTree::ID);
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AU.addProvided(ID);
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}
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private:
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const DomSetType &calculate(const PostDominatorTree &DT,
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const DominatorTree::Node *Node);
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};
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#endif
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