llvm/llvm/include/llvm/Transforms/IPO/Internalize.h

//====- Internalize.h - Internalization API ---------------------*- 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 pass loops over all of the functions and variables in the input module.
// If the function or variable does not need to be preserved according to the
// client supplied callback, it is marked as internal.
//
// This transformation would not be legal in a regular compilation, but it gets
// extra information from the linker about what is safe.
//
// For example: Internalizing a function with external linkage. Only if we are
// told it is only used from within this module, it is safe to do it.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_IPO_INTERNALIZE_H
#define LLVM_TRANSFORMS_IPO_INTERNALIZE_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/IR/PassManager.h"
#include <functional>

namespace llvm {
class Comdat;
class GlobalValue;
class Module;

/// A pass that internalizes all functions and variables other than those that
/// must be preserved according to \c MustPreserveGV.
class InternalizePass : public PassInfoMixin<InternalizePass> { … };

/// Helper function to internalize functions and variables in a Module.
inline bool
internalizeModule(Module &TheModule,
                  std::function<bool(const GlobalValue &)> MustPreserveGV) { … }
} // end namespace llvm

#endif // LLVM_TRANSFORMS_IPO_INTERNALIZE_H