1 //===- InstructionNamer.cpp - Give anonymous instructions names -----------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This is a little utility pass that gives instructions names, this is mostly 11 // useful when diffing the effect of an optimization because deleting an 12 // unnamed instruction can change all other instruction numbering, making the 13 // diff very noisy. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #include "llvm/Transforms/Scalar.h" 18 #include "llvm/IR/Function.h" 19 #include "llvm/IR/Type.h" 20 #include "llvm/Pass.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 (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end(); 36 AI != AE; ++AI) 37 if (!AI->hasName() && !AI->getType()->isVoidTy()) 38 AI->setName("arg"); 39 40 for (BasicBlock &BB : F) { 41 if (!BB.hasName()) 42 BB.setName("bb"); 43 44 for (Instruction &I : BB) 45 if (!I.hasName() && !I.getType()->isVoidTy()) 46 I.setName("tmp"); 47 } 48 return true; 49 } 50 }; 51 52 char InstNamer::ID = 0; 53 } 54 55 INITIALIZE_PASS(InstNamer, "instnamer", 56 "Assign names to anonymous instructions", false, false) 57 char &llvm::InstructionNamerID = InstNamer::ID; 58 //===----------------------------------------------------------------------===// 59 // 60 // InstructionNamer - Give any unnamed non-void instructions "tmp" names. 61 // 62 FunctionPass *llvm::createInstructionNamerPass() { 63 return new InstNamer(); 64 } 65
