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
InstNamer__anonc90c1c250111::InstNamer26 InstNamer() : FunctionPass(ID) {
27 initializeInstNamerPass(*PassRegistry::getPassRegistry());
28 }
29
getAnalysisUsage__anonc90c1c250111::InstNamer30 void getAnalysisUsage(AnalysisUsage &Info) const override {
31 Info.setPreservesAll();
32 }
33
runOnFunction__anonc90c1c250111::InstNamer34 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 //
createInstructionNamerPass()62 FunctionPass *llvm::createInstructionNamerPass() {
63 return new InstNamer();
64 }
65