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84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===- IteratedDominanceFrontier.h - Calculate IDF --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_ITERATEDDOMINANCEFRONTIER_H
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#define LLVM_ANALYSIS_ITERATEDDOMINANCEFRONTIER_H
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#include "llvm/Support/CFGDiff.h"
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#include "llvm/Support/GenericIteratedDominanceFrontier.h"
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namespace llvm {
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class BasicBlock;
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namespace IDFCalculatorDetail {
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/// Specialization for BasicBlock for the optional use of GraphDiff.
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template <bool IsPostDom> struct ChildrenGetterTy<BasicBlock, IsPostDom> {
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using NodeRef = BasicBlock *;
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using ChildrenTy = SmallVector<BasicBlock *, 8>;
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ChildrenGetterTy() = default;
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ChildrenGetterTy(const GraphDiff<BasicBlock *, IsPostDom> *GD) : GD(GD) {
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assert(GD);
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}
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ChildrenTy get(const NodeRef &N);
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const GraphDiff<BasicBlock *, IsPostDom> *GD = nullptr;
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};
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} // end of namespace IDFCalculatorDetail
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template <bool IsPostDom>
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class IDFCalculator final : public IDFCalculatorBase<BasicBlock, IsPostDom> {
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public:
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using IDFCalculatorBase =
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typename llvm::IDFCalculatorBase<BasicBlock, IsPostDom>;
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using ChildrenGetterTy = typename IDFCalculatorBase::ChildrenGetterTy;
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IDFCalculator(DominatorTreeBase<BasicBlock, IsPostDom> &DT)
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: IDFCalculatorBase(DT) {}
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IDFCalculator(DominatorTreeBase<BasicBlock, IsPostDom> &DT,
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const GraphDiff<BasicBlock *, IsPostDom> *GD)
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: IDFCalculatorBase(DT, ChildrenGetterTy(GD)) {
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assert(GD);
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}
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};
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using ForwardIDFCalculator = IDFCalculator<false>;
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using ReverseIDFCalculator = IDFCalculator<true>;
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//===----------------------------------------------------------------------===//
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// Implementation.
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//===----------------------------------------------------------------------===//
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namespace IDFCalculatorDetail {
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template <bool IsPostDom>
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typename ChildrenGetterTy<BasicBlock, IsPostDom>::ChildrenTy
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ChildrenGetterTy<BasicBlock, IsPostDom>::get(const NodeRef &N) {
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using OrderedNodeTy =
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typename IDFCalculatorBase<BasicBlock, IsPostDom>::OrderedNodeTy;
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if (!GD) {
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auto Children = children<OrderedNodeTy>(N);
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return {Children.begin(), Children.end()};
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}
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return GD->template getChildren<IsPostDom>(N);
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}
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} // end of namespace IDFCalculatorDetail
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} // end of namespace llvm
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#endif
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