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/IR/Function.h" 17 #include "llvm/IR/Type.h" 18 #include "llvm/Pass.h" 19 #include "llvm/Transforms/Utils.h" 20 using namespace llvm; 21 22 namespace { 23 struct InstNamer : public FunctionPass { 24 static char ID; // Pass identification, replacement for typeid 25 InstNamer() : FunctionPass(ID) { 26 initializeInstNamerPass(*PassRegistry::getPassRegistry()); 27 } 28 29 void getAnalysisUsage(AnalysisUsage &Info) const override { 30 Info.setPreservesAll(); 31 } 32 33 bool runOnFunction(Function &F) override { 34 for (auto &Arg : F.args()) 35 if (!Arg.hasName()) 36 Arg.setName("arg"); 37 38 for (BasicBlock &BB : F) { 39 if (!BB.hasName()) 40 BB.setName("bb"); 41 42 for (Instruction &I : BB) 43 if (!I.hasName() && !I.getType()->isVoidTy()) 44 I.setName("tmp"); 45 } 46 return true; 47 } 48 }; 49 50 char InstNamer::ID = 0; 51 } 52 53 INITIALIZE_PASS(InstNamer, "instnamer", 54 "Assign names to anonymous instructions", false, false) 55 char &llvm::InstructionNamerID = InstNamer::ID; 56 //===----------------------------------------------------------------------===// 57 // 58 // InstructionNamer - Give any unnamed non-void instructions "tmp" names. 59 // 60 FunctionPass *llvm::createInstructionNamerPass() { 61 return new InstNamer(); 62 } 63