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420a8bf2b2
unify all exit nodes of a function to compute post-dominance information. This does not work with functions that have both unwind and return nodes, because we cannot unify these blocks. The new implementation is better anyway. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8459 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation -*- C++ -*--=//
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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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/// PostDominatorSet Class - Concrete subclass of DominatorSetBase that is used
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/// to compute the post-dominator set. Because there can be multiple exit nodes
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/// in an LLVM function, we calculate post dominators with a special null block
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/// which is the virtual exit node that the real exit nodes all virtually branch
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/// to. Clients should be prepared to see an entry in the dominator sets with a
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/// null BasicBlock*.
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///
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struct PostDominatorSet : public DominatorSetBase {
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PostDominatorSet() : DominatorSetBase(true) {}
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virtual bool runOnFunction(Function &F);
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// getAnalysisUsage - This pass does not modify the function at all.
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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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};
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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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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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Roots = DS.getRoots();
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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>();
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}
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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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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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Roots = DS.getRoots();
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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>();
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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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// 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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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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Roots = DT.getRoots();
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calculate(DT, DT.getRootNode());
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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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// stub - dummy function, just ignore it
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static void stub();
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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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// Make sure that any clients of this file link in PostDominators.cpp
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static IncludeFile
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POST_DOMINATOR_INCLUDE_FILE((void*)&PostDominanceFrontier::stub);
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#endif
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