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//===- SyntheticCountsUtils.h - utilities for count propagation--*- 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 defines utilities for synthetic counts propagation.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SYNTHETICCOUNTSUTILS_H
#define LLVM_ANALYSIS_SYNTHETICCOUNTSUTILS_H
#include "llvm/ADT/STLFunctionalExtras.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Support/ScaledNumber.h"
namespace llvm {
/// Class with methods to propagate synthetic entry counts.
///
/// This class is templated on the type of the call graph and designed to work
/// with the traditional per-module callgraph and the summary callgraphs used in
/// ThinLTO. This contains only static methods and alias templates.
template <typename CallGraphType> class SyntheticCountsUtils {
public:
using Scaled64 = ScaledNumber<uint64_t>;
using CGT = GraphTraits<CallGraphType>;
using NodeRef = typename CGT::NodeRef;
using EdgeRef = typename CGT::EdgeRef;
using SccTy = std::vector<NodeRef>;
// Not all EdgeRef have information about the source of the edge. Hence
// NodeRef corresponding to the source of the EdgeRef is explicitly passed.
using GetProfCountTy =
function_ref<std::optional<Scaled64>(NodeRef, EdgeRef)>;
using AddCountTy = function_ref<void(NodeRef, Scaled64)>;
static void propagate(const CallGraphType &CG, GetProfCountTy GetProfCount,
AddCountTy AddCount);
private:
static void propagateFromSCC(const SccTy &SCC, GetProfCountTy GetProfCount,
AddCountTy AddCount);
};
} // namespace llvm
#endif
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