1//===- InstructionNamer.cpp - Give anonymous instructions names -----------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This is a little utility pass that gives instructions names, this is mostly 10// useful when diffing the effect of an optimization because deleting an 11// unnamed instruction can change all other instruction numbering, making the 12// diff very noisy. 13// 14//===----------------------------------------------------------------------===// 15 16#include "llvm/Transforms/Utils/InstructionNamer.h" 17#include "llvm/IR/Function.h" 18#include "llvm/IR/PassManager.h" 19#include "llvm/IR/Type.h" 20#include "llvm/InitializePasses.h" 21#include "llvm/Pass.h" 22#include "llvm/Transforms/Utils.h" 23 24using namespace llvm; 25 26namespace { 27void nameInstructions(Function &F) { 28 for (auto &Arg : F.args()) { 29 if (!Arg.hasName()) 30 Arg.setName("arg"); 31 } 32 33 for (BasicBlock &BB : F) { 34 if (!BB.hasName()) 35 BB.setName("bb"); 36 37 for (Instruction &I : BB) { 38 if (!I.hasName() && !I.getType()->isVoidTy()) 39 I.setName("i"); 40 } 41 } 42} 43 44struct InstNamer : public FunctionPass { 45 static char ID; // Pass identification, replacement for typeid 46 InstNamer() : FunctionPass(ID) { 47 initializeInstNamerPass(*PassRegistry::getPassRegistry()); 48 } 49 50 void getAnalysisUsage(AnalysisUsage &Info) const override { 51 Info.setPreservesAll(); 52 } 53 54 bool runOnFunction(Function &F) override { 55 nameInstructions(F); 56 return true; 57 } 58}; 59 60 char InstNamer::ID = 0; 61 } // namespace 62 63INITIALIZE_PASS(InstNamer, "instnamer", 64 "Assign names to anonymous instructions", false, false) 65char &llvm::InstructionNamerID = InstNamer::ID; 66//===----------------------------------------------------------------------===// 67// 68// InstructionNamer - Give any unnamed non-void instructions "tmp" names. 69// 70FunctionPass *llvm::createInstructionNamerPass() { 71 return new InstNamer(); 72} 73 74PreservedAnalyses InstructionNamerPass::run(Function &F, 75 FunctionAnalysisManager &FAM) { 76 nameInstructions(F); 77 return PreservedAnalyses::all(); 78} 79