llvm/llvm/include/llvm/Transforms/Utils/SSAUpdater.h

//===- SSAUpdater.h - Unstructured SSA Update Tool --------------*- 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 declares the SSAUpdater class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_SSAUPDATER_H
#define LLVM_TRANSFORMS_UTILS_SSAUPDATER_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include <string>

namespace llvm {

class BasicBlock;
class Instruction;
class LoadInst;
class PHINode;
class DbgVariableRecord;
template <typename T> class SmallVectorImpl;
template <typename T> class SSAUpdaterTraits;
class Type;
class Use;
class Value;
class DbgValueInst;

/// Helper class for SSA formation on a set of values defined in
/// multiple blocks.
///
/// This is used when code duplication or another unstructured
/// transformation wants to rewrite a set of uses of one value with uses of a
/// set of values.
class SSAUpdater { … };

/// Helper class for promoting a collection of loads and stores into SSA
/// Form using the SSAUpdater.
///
/// This handles complexities that SSAUpdater doesn't, such as multiple loads
/// and stores in one block.
///
/// Clients of this class are expected to subclass this and implement the
/// virtual methods.
class LoadAndStorePromoter { … };

} // end namespace llvm

#endif // LLVM_TRANSFORMS_UTILS_SSAUPDATER_H