llvm/llvm/include/llvm/Analysis/PhiValues.h

//===- PhiValues.h - Phi Value Analysis -------------------------*- 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 the PhiValues class, and associated passes, which can be
// used to find the underlying values of the phis in a function, i.e. the
// non-phi values that can be found by traversing the phi graph.
//
// This information is computed lazily and cached. If new phis are added to the
// function they are handled correctly, but if an existing phi has its operands
// modified PhiValues has to be notified by calling invalidateValue.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_PHIVALUES_H
#define LLVM_ANALYSIS_PHIVALUES_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"

namespace llvm {

class Value;
class PHINode;
class Function;

/// Class for calculating and caching the underlying values of phis in a
/// function.
///
/// Initially the PhiValues is empty, and gets incrementally populated whenever
/// it is queried.
class PhiValues { … };

/// The analysis pass which yields a PhiValues
///
/// The analysis does nothing by itself, and just returns an empty PhiValues
/// which will get filled in as it's used.
class PhiValuesAnalysis : public AnalysisInfoMixin<PhiValuesAnalysis> { … };

/// A pass for printing the PhiValues for a function.
///
/// This pass doesn't print whatever information the PhiValues happens to hold,
/// but instead first uses the PhiValues to analyze all the phis in the function
/// so the complete information is printed.
class PhiValuesPrinterPass : public PassInfoMixin<PhiValuesPrinterPass> { … };

/// Wrapper pass for the legacy pass manager
class PhiValuesWrapperPass : public FunctionPass { … };

} // namespace llvm

#endif