-//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation -*- C++ -*--=//
+//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation-*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file exposes interfaces to post dominance information.
//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_ANALYSIS_POST_DOMINATORS_H
-#define LLVM_ANALYSIS_POST_DOMINATORS_H
+#ifndef LLVM_ANALYSIS_POSTDOMINATORS_H
+#define LLVM_ANALYSIS_POSTDOMINATORS_H
-#include "llvm/Analysis/Dominators.h"
+#include "llvm/IR/Dominators.h"
+namespace llvm {
-/// PostDominatorSet Class - Concrete subclass of DominatorSetBase that is used
-/// to compute the post-dominator set. Because there can be multiple exit nodes
-/// in an LLVM function, we calculate post dominators with a special null block
-/// which is the virtual exit node that the real exit nodes all virtually branch
-/// to. Clients should be prepared to see an entry in the dominator sets with a
-/// null BasicBlock*.
+/// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
+/// compute the post-dominator tree.
///
-struct PostDominatorSet : public DominatorSetBase {
- PostDominatorSet() : DominatorSetBase(true) {}
+struct PostDominatorTree : public FunctionPass {
+ static char ID; // Pass identification, replacement for typeid
+ DominatorTreeBase<BasicBlock>* DT;
+
+ PostDominatorTree() : FunctionPass(ID) {
+ initializePostDominatorTreePass(*PassRegistry::getPassRegistry());
+ DT = new DominatorTreeBase<BasicBlock>(true);
+ }
+
+ ~PostDominatorTree() override;
- virtual bool runOnFunction(Function &F);
+ bool runOnFunction(Function &F) override;
- // getAnalysisUsage - This pass does not modify the function at all.
- //
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
-};
+ inline const std::vector<BasicBlock*> &getRoots() const {
+ return DT->getRoots();
+ }
+ inline DomTreeNode *getRootNode() const {
+ return DT->getRootNode();
+ }
-//===-------------------------------------
-// ImmediatePostDominators Class - Concrete subclass of ImmediateDominatorsBase
-// that is used to compute the immediate post-dominators.
-//
-struct ImmediatePostDominators : public ImmediateDominatorsBase {
- ImmediatePostDominators() : ImmediateDominatorsBase(true) {}
+ inline DomTreeNode *operator[](BasicBlock *BB) const {
+ return DT->getNode(BB);
+ }
- virtual bool runOnFunction(Function &F) {
- IDoms.clear(); // Reset from the last time we were run...
- PostDominatorSet &DS = getAnalysis<PostDominatorSet>();
- Roots = DS.getRoots();
- calcIDoms(DS);
- return false;
+ inline DomTreeNode *getNode(BasicBlock *BB) const {
+ return DT->getNode(BB);
}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AU.addRequired<PostDominatorSet>();
+ inline bool dominates(DomTreeNode* A, DomTreeNode* B) const {
+ return DT->dominates(A, B);
}
-};
+ inline bool dominates(const BasicBlock* A, const BasicBlock* B) const {
+ return DT->dominates(A, B);
+ }
-//===-------------------------------------
-// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
-// compute the a post-dominator tree.
-//
-struct PostDominatorTree : public DominatorTreeBase {
- PostDominatorTree() : DominatorTreeBase(true) {}
+ inline bool properlyDominates(const DomTreeNode* A, DomTreeNode* B) const {
+ return DT->properlyDominates(A, B);
+ }
- virtual bool runOnFunction(Function &F) {
- reset(); // Reset from the last time we were run...
- PostDominatorSet &DS = getAnalysis<PostDominatorSet>();
- Roots = DS.getRoots();
- calculate(DS);
- return false;
+ inline bool properlyDominates(BasicBlock* A, BasicBlock* B) const {
+ return DT->properlyDominates(A, B);
}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AU.addRequired<PostDominatorSet>();
+ inline BasicBlock *findNearestCommonDominator(BasicBlock *A, BasicBlock *B) {
+ return DT->findNearestCommonDominator(A, B);
}
-private:
- void calculate(const PostDominatorSet &DS);
-};
+ inline const BasicBlock *findNearestCommonDominator(const BasicBlock *A,
+ const BasicBlock *B) {
+ return DT->findNearestCommonDominator(A, B);
+ }
-//===-------------------------------------
-// PostDominanceFrontier Class - Concrete subclass of DominanceFrontier that is
-// used to compute the a post-dominance frontier.
-//
-struct PostDominanceFrontier : public DominanceFrontierBase {
- PostDominanceFrontier() : DominanceFrontierBase(true) {}
+ /// Get all nodes post-dominated by R, including R itself.
+ void getDescendants(BasicBlock *R,
+ SmallVectorImpl<BasicBlock *> &Result) const {
+ DT->getDescendants(R, Result);
+ }
- virtual bool runOnFunction(Function &) {
- Frontiers.clear();
- PostDominatorTree &DT = getAnalysis<PostDominatorTree>();
- Roots = DT.getRoots();
- calculate(DT, DT.getRootNode());
- return false;
+ void releaseMemory() override {
+ DT->releaseMemory();
}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AU.addRequired<PostDominatorTree>();
+ void print(raw_ostream &OS, const Module*) const override;
+};
+
+FunctionPass* createPostDomTree();
+
+template <> struct GraphTraits<PostDominatorTree*>
+ : public GraphTraits<DomTreeNode*> {
+ static NodeType *getEntryNode(PostDominatorTree *DT) {
+ return DT->getRootNode();
}
- // stub - dummy function, just ignore it
- static void stub();
+ static nodes_iterator nodes_begin(PostDominatorTree *N) {
+ if (getEntryNode(N))
+ return df_begin(getEntryNode(N));
+ else
+ return df_end(getEntryNode(N));
+ }
-private:
- const DomSetType &calculate(const PostDominatorTree &DT,
- const DominatorTree::Node *Node);
+ static nodes_iterator nodes_end(PostDominatorTree *N) {
+ return df_end(getEntryNode(N));
+ }
};
-// Make sure that any clients of this file link in PostDominators.cpp
-static IncludeFile
-POST_DOMINATOR_INCLUDE_FILE((void*)&PostDominanceFrontier::stub);
+} // End llvm namespace
#endif
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