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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
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