1 //===- InstructionNamer.cpp - Give anonymous instructions names -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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
15 //===----------------------------------------------------------------------===//
17 #include "llvm/IR/Function.h"
18 #include "llvm/IR/Type.h"
19 #include "llvm/Pass.h"
20 #include "llvm/Transforms/Scalar.h"
24 struct InstNamer : public FunctionPass {
25 static char ID; // Pass identification, replacement for typeid
26 InstNamer() : FunctionPass(ID) {
27 initializeInstNamerPass(*PassRegistry::getPassRegistry());
30 void getAnalysisUsage(AnalysisUsage &Info) const override {
31 Info.setPreservesAll();
34 bool runOnFunction(Function &F) override {
35 for (auto &Arg : F.args())
39 for (BasicBlock &BB : F) {
43 for (Instruction &I : BB)
44 if (!I.hasName() && !I.getType()->isVoidTy())
51 char InstNamer::ID = 0;
54 INITIALIZE_PASS(InstNamer, "instnamer",
55 "Assign names to anonymous instructions", false, false)
56 char &llvm::InstructionNamerID = InstNamer::ID;
57 //===----------------------------------------------------------------------===//
59 // InstructionNamer - Give any unnamed non-void instructions "tmp" names.
61 FunctionPass *llvm::createInstructionNamerPass() {
62 return new InstNamer();