src/llvm/lib/Transforms/Utils/InstructionNamer.cpp

   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 (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
  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 }