unittests/ADT/PointerSumTypeTest.cpp

   1 //===- llvm/unittest/ADT/PointerSumTypeTest.cpp ---------------------------===//
   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 "gtest/gtest.h"
  11 #include "llvm/ADT/PointerSumType.h"
  12 using namespace llvm;
  13
  14 namespace {
  15
  16 struct PointerSumTypeTest : public testing::Test {
  17   enum Kinds { Float, Int1, Int2 };
  18   float f;
  19   int i1, i2;
  20
  21   typedef PointerSumType<Kinds, PointerSumTypeMember<Float, float *>,
  22                          PointerSumTypeMember<Int1, int *>,
  23                          PointerSumTypeMember<Int2, int *>>
  24       SumType;
  25   SumType a, b, c, n;
  26
  27   PointerSumTypeTest()
  28       : f(3.14f), i1(42), i2(-1), a(SumType::create<Float>(&f)),
  29         b(SumType::create<Int1>(&i1)), c(SumType::create<Int2>(&i2)), n() {}
  30 };
  31
  32 TEST_F(PointerSumTypeTest, NullTest) {
  33   EXPECT_TRUE(a);
  34   EXPECT_TRUE(b);
  35   EXPECT_TRUE(c);
  36   EXPECT_FALSE(n);
  37 }
  38
  39 TEST_F(PointerSumTypeTest, GetTag) {
  40   EXPECT_EQ(Float, a.getTag());
  41   EXPECT_EQ(Int1, b.getTag());
  42   EXPECT_EQ(Int2, c.getTag());
  43   EXPECT_EQ((Kinds)0, n.getTag());
  44 }
  45
  46 TEST_F(PointerSumTypeTest, Is) {
  47   EXPECT_TRUE(a.is<Float>());
  48   EXPECT_FALSE(a.is<Int1>());
  49   EXPECT_FALSE(a.is<Int2>());
  50   EXPECT_FALSE(b.is<Float>());
  51   EXPECT_TRUE(b.is<Int1>());
  52   EXPECT_FALSE(b.is<Int2>());
  53   EXPECT_FALSE(c.is<Float>());
  54   EXPECT_FALSE(c.is<Int1>());
  55   EXPECT_TRUE(c.is<Int2>());
  56 }
  57
  58 TEST_F(PointerSumTypeTest, Get) {
  59   EXPECT_EQ(&f, a.get<Float>());
  60   EXPECT_EQ(nullptr, a.get<Int1>());
  61   EXPECT_EQ(nullptr, a.get<Int2>());
  62   EXPECT_EQ(nullptr, b.get<Float>());
  63   EXPECT_EQ(&i1, b.get<Int1>());
  64   EXPECT_EQ(nullptr, b.get<Int2>());
  65   EXPECT_EQ(nullptr, c.get<Float>());
  66   EXPECT_EQ(nullptr, c.get<Int1>());
  67   EXPECT_EQ(&i2, c.get<Int2>());
  68
  69   // Note that we can use .get even on a null sum type. It just always produces
  70   // a null pointer, even if one of the discriminants is null.
  71   EXPECT_EQ(nullptr, n.get<Float>());
  72   EXPECT_EQ(nullptr, n.get<Int1>());
  73   EXPECT_EQ(nullptr, n.get<Int2>());
  74 }
  75
  76 TEST_F(PointerSumTypeTest, Cast) {
  77   EXPECT_EQ(&f, a.cast<Float>());
  78   EXPECT_EQ(&i1, b.cast<Int1>());
  79   EXPECT_EQ(&i2, c.cast<Int2>());
  80 }
  81
  82 TEST_F(PointerSumTypeTest, Assignment) {
  83   b = SumType::create<Int2>(&i2);
  84   EXPECT_EQ(nullptr, b.get<Float>());
  85   EXPECT_EQ(nullptr, b.get<Int1>());
  86   EXPECT_EQ(&i2, b.get<Int2>());
  87
  88   b = SumType::create<Int2>(&i1);
  89   EXPECT_EQ(nullptr, b.get<Float>());
  90   EXPECT_EQ(nullptr, b.get<Int1>());
  91   EXPECT_EQ(&i1, b.get<Int2>());
  92
  93   float Local = 1.616f;
  94   b = SumType::create<Float>(&Local);
  95   EXPECT_EQ(&Local, b.get<Float>());
  96   EXPECT_EQ(nullptr, b.get<Int1>());
  97   EXPECT_EQ(nullptr, b.get<Int2>());
  98
  99   n = SumType::create<Int1>(&i2);
 100   EXPECT_TRUE(n);
 101   EXPECT_EQ(nullptr, n.get<Float>());
 102   EXPECT_EQ(&i2, n.get<Int1>());
 103   EXPECT_EQ(nullptr, n.get<Int2>());
 104
 105   n = SumType::create<Float>(nullptr);
 106   EXPECT_FALSE(n);
 107   EXPECT_EQ(nullptr, n.get<Float>());
 108   EXPECT_EQ(nullptr, n.get<Int1>());
 109   EXPECT_EQ(nullptr, n.get<Int2>());
 110 }
 111
 112
 113 } // end anonymous namespace