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1 | //===- llvm/unittest/ADT/PointerIntPairTest.cpp - Unit tests --------------===// |
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/PointerIntPair.h" | |
12 | #include <limits> | |
13 | using namespace llvm; | |
14 | ||
15 | namespace { | |
16 | ||
17 | // Test fixture | |
18 | class PointerIntPairTest : public testing::Test { | |
19 | }; | |
20 | ||
21 | TEST_F(PointerIntPairTest, GetSet) { | |
22 | PointerIntPair<PointerIntPairTest *, 2> Pair(this, 1U); | |
23 | EXPECT_EQ(this, Pair.getPointer()); | |
24 | EXPECT_EQ(1U, Pair.getInt()); | |
25 | ||
26 | Pair.setInt(2); | |
27 | EXPECT_EQ(this, Pair.getPointer()); | |
28 | EXPECT_EQ(2U, Pair.getInt()); | |
29 | ||
30 | Pair.setPointer(nullptr); | |
31 | EXPECT_EQ(nullptr, Pair.getPointer()); | |
32 | EXPECT_EQ(2U, Pair.getInt()); | |
33 | ||
34 | Pair.setPointerAndInt(this, 3U); | |
35 | EXPECT_EQ(this, Pair.getPointer()); | |
36 | EXPECT_EQ(3U, Pair.getInt()); | |
37 | } | |
38 | ||
39 | TEST_F(PointerIntPairTest, DefaultInitialize) { | |
40 | PointerIntPair<PointerIntPairTest *, 2> Pair; | |
41 | EXPECT_EQ(nullptr, Pair.getPointer()); | |
42 | EXPECT_EQ(0U, Pair.getInt()); | |
43 | } | |
44 | ||
45 | #if !(defined(_MSC_VER) && _MSC_VER==1700) | |
46 | TEST_F(PointerIntPairTest, ManyUnusedBits) { | |
47 | // In real code this would be a word-sized integer limited to 31 bits. | |
48 | struct Fixnum31 { | |
49 | uintptr_t Value; | |
50 | }; | |
51 | class FixnumPointerTraits { | |
52 | public: | |
53 | static inline void *getAsVoidPointer(Fixnum31 Num) { | |
54 | return reinterpret_cast<void *>(Num.Value << NumLowBitsAvailable); | |
55 | } | |
56 | static inline Fixnum31 getFromVoidPointer(void *P) { | |
57 | // In real code this would assert that the value is in range. | |
58 | return { reinterpret_cast<uintptr_t>(P) >> NumLowBitsAvailable }; | |
59 | } | |
60 | enum { NumLowBitsAvailable = std::numeric_limits<uintptr_t>::digits - 31 }; | |
61 | }; | |
62 | ||
63 | PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits> pair; | |
64 | EXPECT_EQ((uintptr_t)0, pair.getPointer().Value); | |
65 | EXPECT_FALSE(pair.getInt()); | |
66 | ||
67 | pair.setPointerAndInt({ 0x7FFFFFFF }, true ); | |
68 | EXPECT_EQ((uintptr_t)0x7FFFFFFF, pair.getPointer().Value); | |
69 | EXPECT_TRUE(pair.getInt()); | |
70 | ||
71 | EXPECT_EQ(FixnumPointerTraits::NumLowBitsAvailable - 1, | |
72 | PointerLikeTypeTraits<decltype(pair)>::NumLowBitsAvailable); | |
73 | } | |
74 | #endif | |
75 | ||
76 | } // end anonymous namespace |