unittests/ADT/PointerEmbeddedIntTest.cpp

   1 //===- llvm/unittest/ADT/PointerEmbeddedIntTest.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/PointerEmbeddedInt.h"
  12 using namespace llvm;
  13
  14 namespace {
  15
  16 TEST(PointerEmbeddedIntTest, Basic) {
  17   PointerEmbeddedInt<int, CHAR_BIT> I = 42, J = 43;
  18
  19   EXPECT_EQ(42, I);
  20   EXPECT_EQ(43, I + 1);
  21   EXPECT_EQ(sizeof(uintptr_t) * CHAR_BIT - CHAR_BIT,
  22             PointerLikeTypeTraits<decltype(I)>::NumLowBitsAvailable);
  23
  24   EXPECT_FALSE(I == J);
  25   EXPECT_TRUE(I != J);
  26   EXPECT_TRUE(I < J);
  27   EXPECT_FALSE(I > J);
  28   EXPECT_TRUE(I <= J);
  29   EXPECT_FALSE(I >= J);
  30
  31   EXPECT_FALSE(I == 43);
  32   EXPECT_TRUE(I != 43);
  33   EXPECT_TRUE(I < 43);
  34   EXPECT_FALSE(I > 43);
  35   EXPECT_TRUE(I <= 43);
  36   EXPECT_FALSE(I >= 43);
  37
  38   EXPECT_FALSE(42 == J);
  39   EXPECT_TRUE(42 != J);
  40   EXPECT_TRUE(42 < J);
  41   EXPECT_FALSE(42 > J);
  42   EXPECT_TRUE(42 <= J);
  43   EXPECT_FALSE(42 >= J);
  44 }
  45
  46 TEST(PointerEmbeddedIntTest, intptr_t) {
  47   PointerEmbeddedInt<intptr_t, CHAR_BIT> IPos = 42, INeg = -42;
  48   EXPECT_EQ(42, IPos);
  49   EXPECT_EQ(-42, INeg);
  50
  51   PointerEmbeddedInt<uintptr_t, CHAR_BIT> U = 42, USaturated = 255;
  52   EXPECT_EQ(42U, U);
  53   EXPECT_EQ(255U, USaturated);
  54
  55   PointerEmbeddedInt<intptr_t, std::numeric_limits<intptr_t>::digits>
  56       IMax = std::numeric_limits<intptr_t>::max() >> 1,
  57       IMin = std::numeric_limits<intptr_t>::min() >> 1;
  58   EXPECT_EQ(std::numeric_limits<intptr_t>::max() >> 1, IMax);
  59   EXPECT_EQ(std::numeric_limits<intptr_t>::min() >> 1, IMin);
  60
  61   PointerEmbeddedInt<uintptr_t, std::numeric_limits<uintptr_t>::digits - 1>
  62       UMax = std::numeric_limits<uintptr_t>::max() >> 1,
  63       UMin = std::numeric_limits<uintptr_t>::min() >> 1;
  64   EXPECT_EQ(std::numeric_limits<uintptr_t>::max() >> 1, UMax);
  65   EXPECT_EQ(std::numeric_limits<uintptr_t>::min() >> 1, UMin);
  66 }
  67
  68 TEST(PointerEmbeddedIntTest, PointerLikeTypeTraits) {
  69   PointerEmbeddedInt<int, CHAR_BIT> I = 42;
  70   using ITraits = PointerLikeTypeTraits<decltype(I)>;
  71   EXPECT_EQ(42, ITraits::getFromVoidPointer(ITraits::getAsVoidPointer(I)));
  72
  73   PointerEmbeddedInt<uintptr_t, std::numeric_limits<uintptr_t>::digits - 1>
  74       Max = std::numeric_limits<uintptr_t>::max() >> 1;
  75   using MaxTraits = PointerLikeTypeTraits<decltype(Max)>;
  76   EXPECT_EQ(std::numeric_limits<uintptr_t>::max() >> 1,
  77             MaxTraits::getFromVoidPointer(MaxTraits::getAsVoidPointer(Max)));
  78 }
  79
  80 } // end anonymous namespace