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/InitializePasses.h" 19 #include "llvm/Pass.h" 20 #include "llvm/Transforms/Utils.h" 21 using namespace llvm; 22 23 namespace { 24 struct InstNamer : public FunctionPass { 25 static char ID; // Pass identification, replacement for typeid 26 InstNamer() : FunctionPass(ID) { 27 initializeInstNamerPass(*PassRegistry::getPassRegistry()); 28 } 29 30 void getAnalysisUsage(AnalysisUsage &Info) const override { 31 Info.setPreservesAll(); 32 } 33 34 bool runOnFunction(Function &F) override { 35 for (auto &Arg : F.args()) 36 if (!Arg.hasName()) 37 Arg.setName("arg"); 38 39 for (BasicBlock &BB : F) { 40 if (!BB.hasName()) 41 BB.setName("bb"); 42 43 for (Instruction &I : BB) 44 if (!I.hasName() && !I.getType()->isVoidTy()) 45 I.setName("i"); 46 } 47 return true; 48 } 49 }; 50 51 char InstNamer::ID = 0; 52 } 53 54 INITIALIZE_PASS(InstNamer, "instnamer", 55 "Assign names to anonymous instructions", false, false) 56 char &llvm::InstructionNamerID = InstNamer::ID; 57 //===----------------------------------------------------------------------===// 58 // 59 // InstructionNamer - Give any unnamed non-void instructions "tmp" names. 60 // 61 FunctionPass *llvm::createInstructionNamerPass() { 62 return new InstNamer(); 63 } 64