Local.cpp revision 0b8c9a80f20772c3793201ab5b251d3520b9cea3 
1//===- Local.cpp - Unit tests for Local -----------------------------------===//
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#include "llvm/Transforms/Utils/Local.h"
11#include "llvm/IR/BasicBlock.h"
12#include "llvm/IR/IRBuilder.h"
13#include "llvm/IR/Instructions.h"
14#include "llvm/IR/LLVMContext.h"
15#include "gtest/gtest.h"
16
17using namespace llvm;
18
19TEST(Local, RecursivelyDeleteDeadPHINodes) {
20  LLVMContext &C(getGlobalContext());
21
22  IRBuilder<> builder(C);
23
24  // Make blocks
25  BasicBlock *bb0 = BasicBlock::Create(C);
26  BasicBlock *bb1 = BasicBlock::Create(C);
27
28  builder.SetInsertPoint(bb0);
29  PHINode    *phi = builder.CreatePHI(Type::getInt32Ty(C), 2);
30  BranchInst *br0 = builder.CreateCondBr(builder.getTrue(), bb0, bb1);
31
32  builder.SetInsertPoint(bb1);
33  BranchInst *br1 = builder.CreateBr(bb0);
34
35  phi->addIncoming(phi, bb0);
36  phi->addIncoming(phi, bb1);
37
38  // The PHI will be removed
39  EXPECT_TRUE(RecursivelyDeleteDeadPHINode(phi));
40
41  // Make sure the blocks only contain the branches
42  EXPECT_EQ(&bb0->front(), br0);
43  EXPECT_EQ(&bb1->front(), br1);
44
45  builder.SetInsertPoint(bb0);
46  phi = builder.CreatePHI(Type::getInt32Ty(C), 0);
47
48  EXPECT_TRUE(RecursivelyDeleteDeadPHINode(phi));
49
50  builder.SetInsertPoint(bb0);
51  phi = builder.CreatePHI(Type::getInt32Ty(C), 0);
52  builder.CreateAdd(phi, phi);
53
54  EXPECT_TRUE(RecursivelyDeleteDeadPHINode(phi));
55
56  bb0->dropAllReferences();
57  bb1->dropAllReferences();
58  delete bb0;
59  delete bb1;
60}
61