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//===- ValueProfileCollector.cpp - determine what to value profile --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// The implementation of the ValueProfileCollector via ValueProfileCollectorImpl
//
//===----------------------------------------------------------------------===//
#include "ValueProfilePlugins.inc"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/InitializePasses.h"
#include <cassert>
using namespace llvm;
namespace {
/// A plugin-based class that takes an arbitrary number of Plugin types.
/// Each plugin type must satisfy the following API:
/// 1) the constructor must take a `Function &f`. Typically, the plugin would
/// scan the function looking for candidates.
/// 2) contain a member function with the following signature and name:
/// void run(std::vector<CandidateInfo> &Candidates);
/// such that the plugin would append its result into the vector parameter.
///
/// Plugins are defined in ValueProfilePlugins.inc
template <class... Ts> class PluginChain;
/// The type PluginChainFinal is the final chain of plugins that will be used by
/// ValueProfileCollectorImpl.
using PluginChainFinal = PluginChain<VP_PLUGIN_LIST>;
template <> class PluginChain<> {
public:
PluginChain(Function &F, TargetLibraryInfo &TLI) {}
void get(InstrProfValueKind K, std::vector<CandidateInfo> &Candidates) {}
};
template <class PluginT, class... Ts>
class PluginChain<PluginT, Ts...> : public PluginChain<Ts...> {
PluginT Plugin;
using Base = PluginChain<Ts...>;
public:
PluginChain(Function &F, TargetLibraryInfo &TLI)
: PluginChain<Ts...>(F, TLI), Plugin(F, TLI) {}
void get(InstrProfValueKind K, std::vector<CandidateInfo> &Candidates) {
if (K == PluginT::Kind)
Plugin.run(Candidates);
Base::get(K, Candidates);
}
};
} // end anonymous namespace
/// ValueProfileCollectorImpl inherits the API of PluginChainFinal.
class ValueProfileCollector::ValueProfileCollectorImpl : public PluginChainFinal {
public:
using PluginChainFinal::PluginChainFinal;
};
ValueProfileCollector::ValueProfileCollector(Function &F,
TargetLibraryInfo &TLI)
: PImpl(new ValueProfileCollectorImpl(F, TLI)) {}
ValueProfileCollector::~ValueProfileCollector() = default;
std::vector<CandidateInfo>
ValueProfileCollector::get(InstrProfValueKind Kind) const {
std::vector<CandidateInfo> Result;
PImpl->get(Kind, Result);
return Result;
}
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