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//=- llvm/Analysis/PostDominators.h - Post Dominator Calculation --*- C++ -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file exposes interfaces to post dominance information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_POSTDOMINATORS_H
#define LLVM_ANALYSIS_POSTDOMINATORS_H
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Pass.h"
namespace llvm {
class Function;
class raw_ostream;
/// PostDominatorTree Class - Concrete subclass of DominatorTree that is used to
/// compute the post-dominator tree.
class PostDominatorTree : public PostDomTreeBase<BasicBlock> {
public:
using Base = PostDomTreeBase<BasicBlock>;
PostDominatorTree() = default;
explicit PostDominatorTree(Function &F) { recalculate(F); }
/// Handle invalidation explicitly.
bool invalidate(Function &F, const PreservedAnalyses &PA,
FunctionAnalysisManager::Invalidator &);
// Ensure base-class overloads are visible.
using Base::dominates;
/// Return true if \p I1 dominates \p I2. This checks if \p I2 comes before
/// \p I1 if they belongs to the same basic block.
bool dominates(const Instruction *I1, const Instruction *I2) const;
};
/// Analysis pass which computes a \c PostDominatorTree.
class PostDominatorTreeAnalysis
: public AnalysisInfoMixin<PostDominatorTreeAnalysis> {
friend AnalysisInfoMixin<PostDominatorTreeAnalysis>;
static AnalysisKey Key;
public:
/// Provide the result type for this analysis pass.
using Result = PostDominatorTree;
/// Run the analysis pass over a function and produce a post dominator
/// tree.
PostDominatorTree run(Function &F, FunctionAnalysisManager &);
};
/// Printer pass for the \c PostDominatorTree.
class PostDominatorTreePrinterPass
: public PassInfoMixin<PostDominatorTreePrinterPass> {
raw_ostream &OS;
public:
explicit PostDominatorTreePrinterPass(raw_ostream &OS);
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
static bool isRequired() { return true; }
};
struct PostDominatorTreeWrapperPass : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
PostDominatorTree DT;
PostDominatorTreeWrapperPass();
PostDominatorTree &getPostDomTree() { return DT; }
const PostDominatorTree &getPostDomTree() const { return DT; }
bool runOnFunction(Function &F) override;
void verifyAnalysis() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
void releaseMemory() override { DT.reset(); }
void print(raw_ostream &OS, const Module*) const override;
};
FunctionPass* createPostDomTree();
template <> struct GraphTraits<PostDominatorTree*>
: public GraphTraits<DomTreeNode*> {
static NodeRef getEntryNode(PostDominatorTree *DT) {
return DT->getRootNode();
}
static nodes_iterator nodes_begin(PostDominatorTree *N) {
return df_begin(getEntryNode(N));
}
static nodes_iterator nodes_end(PostDominatorTree *N) {
return df_end(getEntryNode(N));
}
};
} // end namespace llvm
#endif // LLVM_ANALYSIS_POSTDOMINATORS_H
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