AssignGUID.h

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//===-- AssignGUID.h - Unique identifier assignment pass --------*- 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 provides a pass which assigns a a GUID (globally unique identifier)
// to every GlobalValue in the module, according to its current name, linkage,
// and originating file. This way we have a consistent identifier even when
// these inputs to the GUID change (for instance, after externalising a global
// in ThinLTO).
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_TRANSFORMS_UTILS_ASSIGNGUID_H
#define LLVM_TRANSFORMS_UTILS_ASSIGNGUID_H
 
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Support/Debug.h"
 
namespace llvm {
 
class AssignGUIDPass : public PassInfoMixin<AssignGUIDPass> {
public:
  AssignGUIDPass() = default;
 
  static void runOnModule(Module &M);
 
  PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM) {
    AssignGUIDPass::runOnModule(M);
    return PreservedAnalyses::all();
  }
 
  static bool isRequired() { return true; }
 
  // Let GlobalMerge assign a GUID for merged GVs, instead of needing to
  // traverse all the module; or instead of making GlobalValue::assignGUID
  // public.
  static void assignGUIDForMergedGV(GlobalVariable &GV);
};
 
} // end namespace llvm
 
#endif // LLVM_TRANSFORMS_UTILS_ASSIGNGUID_H