IteratedDominanceFrontier.h

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//===- IteratedDominanceFrontier.h - Calculate IDF --------------*- 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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_ANALYSIS_ITERATEDDOMINANCEFRONTIER_H
#define LLVM_ANALYSIS_ITERATEDDOMINANCEFRONTIER_H
 
#include "llvm/Support/CFGDiff.h"
#include "llvm/Support/GenericIteratedDominanceFrontier.h"
 
namespace llvm {
 
class BasicBlock;
 
namespace IDFCalculatorDetail {
 
/// Specialization for BasicBlock for the optional use of GraphDiff.
template <bool IsPostDom> struct ChildrenGetterTy<BasicBlock, IsPostDom> {
  using NodeRef = BasicBlock *;
  using ChildrenTy = SmallVector<BasicBlock *, 8>;
 
  ChildrenGetterTy() = default;
  ChildrenGetterTy(const GraphDiff<BasicBlock *, IsPostDom> *GD) : GD(GD) {
    assert(GD);
  }
 
  ChildrenTy get(const NodeRef &N);
 
  const GraphDiff<BasicBlock *, IsPostDom> *GD = nullptr;
};
 
} // end of namespace IDFCalculatorDetail
 
template <bool IsPostDom>
class IDFCalculator final : public IDFCalculatorBase<BasicBlock, IsPostDom> {
public:
  using IDFCalculatorBase =
      typename llvm::IDFCalculatorBase<BasicBlock, IsPostDom>;
  using ChildrenGetterTy = typename IDFCalculatorBase::ChildrenGetterTy;
 
  IDFCalculator(DominatorTreeBase<BasicBlock, IsPostDom> &DT)
      : IDFCalculatorBase(DT) {}
 
  IDFCalculator(DominatorTreeBase<BasicBlock, IsPostDom> &DT,
                const GraphDiff<BasicBlock *, IsPostDom> *GD)
      : IDFCalculatorBase(DT, ChildrenGetterTy(GD)) {
    assert(GD);
  }
};
 
using ForwardIDFCalculator = IDFCalculator<false>;
using ReverseIDFCalculator = IDFCalculator<true>;
 
//===----------------------------------------------------------------------===//
// Implementation.
//===----------------------------------------------------------------------===//
 
namespace IDFCalculatorDetail {
 
template <bool IsPostDom>
typename ChildrenGetterTy<BasicBlock, IsPostDom>::ChildrenTy
ChildrenGetterTy<BasicBlock, IsPostDom>::get(const NodeRef &N) {
 
  using OrderedNodeTy =
      typename IDFCalculatorBase<BasicBlock, IsPostDom>::OrderedNodeTy;
 
  if (!GD) {
    auto Children = children<OrderedNodeTy>(N);
    return {Children.begin(), Children.end()};
  }
 
  return GD->template getChildren<IsPostDom>(N);
}
 
} // end of namespace IDFCalculatorDetail
 
} // end of namespace llvm
 
#endif