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d20c824b20
change is not useful in and of itself, but it lays the groundwork for combining the dominator and postdominator implementations. Also, factor a few methods that are common to DominatorTree and PostDominatorTree into DominatorTreeBase. Again, this will make merging the two calculation methods simpler in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42248 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation-*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file exposes interfaces to post dominance information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_POST_DOMINATORS_H
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#define LLVM_ANALYSIS_POST_DOMINATORS_H
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#include "llvm/Analysis/Dominators.h"
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namespace llvm {
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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 char ID; // Pass identification, replacement for typeid
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PostDominatorTree() :
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DominatorTreeBase((intptr_t)&ID, 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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calculate(F);
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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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}
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private:
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void calculate(Function &F);
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unsigned DFSPass(BasicBlock *V, unsigned N);
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void Compress(BasicBlock *V, InfoRec &VInfo);
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BasicBlock *Eval(BasicBlock *V);
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void Link(BasicBlock *V, BasicBlock *W, InfoRec &WInfo);
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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 char ID;
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PostDominanceFrontier()
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: DominanceFrontierBase((intptr_t) &ID, 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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Roots = DT.getRoots();
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if (const DomTreeNode *Root = DT.getRootNode())
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calculate(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>();
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}
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private:
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const DomSetType &calculate(const PostDominatorTree &DT,
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const DomTreeNode *Node);
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};
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} // End llvm namespace
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// Make sure that any clients of this file link in PostDominators.cpp
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FORCE_DEFINING_FILE_TO_BE_LINKED(PostDominanceFrontier)
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#endif
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