LLVM  4.0.0
InstructionNamer.cpp
Go to the documentation of this file.
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) {
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 (BasicBlock &BB : F) {
41  if (!BB.hasName())
42  BB.setName("bb");
43 
44  for (Instruction &I : BB)
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 //
63  return new InstNamer();
64 }
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
arg_iterator arg_end()
Definition: Function.h:559
#define F(x, y, z)
Definition: MD5.cpp:51
LLVM Basic Block Representation.
Definition: BasicBlock.h:51
Represent the analysis usage information of a pass.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:298
arg_iterator arg_begin()
Definition: Function.h:550
#define INITIALIZE_PASS(passName, arg, name, cfg, analysis)
Definition: PassSupport.h:36
Iterator for intrusive lists based on ilist_node.
void setPreservesAll()
Set by analyses that do not transform their input at all.
void initializeInstNamerPass(PassRegistry &)
#define I(x, y, z)
Definition: MD5.cpp:54
char & InstructionNamerID
FunctionPass * createInstructionNamerPass()