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/Function.h"
  19 #include "llvm/Pass.h"
  20 #include "llvm/Type.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
  28     void getAnalysisUsage(AnalysisUsage &Info) const {
  29       Info.setPreservesAll();
  30     }
  31
  32     bool runOnFunction(Function &F) {
  33       for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end();
  34            AI != AE; ++AI)
  35         if (!AI->hasName() && AI->getType() != Type::getVoidTy(F.getContext()))
  36           AI->setName("tmp");
  37
  38       for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
  39         if (!BB->hasName())
  40           BB->setName("BB");
  41
  42         for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
  43           if (!I->hasName() && I->getType() != Type::getVoidTy(F.getContext()))
  44             I->setName("tmp");
  45       }
  46       return true;
  47     }
  48   };
  49
  50   char InstNamer::ID = 0;
  51   static RegisterPass<InstNamer> X("instnamer",
  52                                    "Assign names to anonymous instructions");
  53 }
  54
  55
  56 const PassInfo *const llvm::InstructionNamerID = &X;
  57 //===----------------------------------------------------------------------===//
  58 //
  59 // InstructionNamer - Give any unnamed non-void instructions "tmp" names.
  60 //
  61 FunctionPass *llvm::createInstructionNamerPass() {
  62   return new InstNamer();
  63 }