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75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
//===- llvm/unittest/ADT/PointerIntPairTest.cpp - Unit tests --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include <limits>
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using namespace llvm;
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namespace {
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// Test fixture
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class PointerIntPairTest : public testing::Test {
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};
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TEST_F(PointerIntPairTest, GetSet) {
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PointerIntPair<PointerIntPairTest *, 2> Pair(this, 1U);
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EXPECT_EQ(this, Pair.getPointer());
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EXPECT_EQ(1U, Pair.getInt());
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Pair.setInt(2);
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EXPECT_EQ(this, Pair.getPointer());
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EXPECT_EQ(2U, Pair.getInt());
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Pair.setPointer(nullptr);
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EXPECT_EQ(nullptr, Pair.getPointer());
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EXPECT_EQ(2U, Pair.getInt());
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Pair.setPointerAndInt(this, 3U);
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EXPECT_EQ(this, Pair.getPointer());
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EXPECT_EQ(3U, Pair.getInt());
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}
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TEST_F(PointerIntPairTest, DefaultInitialize) {
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PointerIntPair<PointerIntPairTest *, 2> Pair;
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EXPECT_EQ(nullptr, Pair.getPointer());
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EXPECT_EQ(0U, Pair.getInt());
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}
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TEST_F(PointerIntPairTest, ManyUnusedBits) {
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// In real code this would be a word-sized integer limited to 31 bits.
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struct Fixnum31 {
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uintptr_t Value;
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};
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class FixnumPointerTraits {
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public:
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static inline void *getAsVoidPointer(Fixnum31 Num) {
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return reinterpret_cast<void *>(Num.Value << NumLowBitsAvailable);
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}
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static inline Fixnum31 getFromVoidPointer(void *P) {
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// In real code this would assert that the value is in range.
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return { reinterpret_cast<uintptr_t>(P) >> NumLowBitsAvailable };
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}
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enum { NumLowBitsAvailable = std::numeric_limits<uintptr_t>::digits - 31 };
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};
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PointerIntPair<Fixnum31, 1, bool, FixnumPointerTraits> pair;
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EXPECT_EQ((uintptr_t)0, pair.getPointer().Value);
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EXPECT_FALSE(pair.getInt());
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pair.setPointerAndInt({ 0x7FFFFFFF }, true );
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EXPECT_EQ((uintptr_t)0x7FFFFFFF, pair.getPointer().Value);
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EXPECT_TRUE(pair.getInt());
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EXPECT_EQ(FixnumPointerTraits::NumLowBitsAvailable - 1,
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PointerLikeTypeTraits<decltype(pair)>::NumLowBitsAvailable);
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}
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} // end anonymous namespace
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