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::VoidTy)
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::VoidTy)
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 }
64