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"
21using namespace llvm;
22
23namespace {
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 (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
41        if (!BB->hasName())
42          BB->setName("bb");
43
44        for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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
55INITIALIZE_PASS(InstNamer, "instnamer",
56                "Assign names to anonymous instructions", false, false)
57char &llvm::InstructionNamerID = InstNamer::ID;
58//===----------------------------------------------------------------------===//
59//
60// InstructionNamer - Give any unnamed non-void instructions "tmp" names.
61//
62FunctionPass *llvm::createInstructionNamerPass() {
63  return new InstNamer();
64}
65