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b04f462e22
Summary: The problem here is that an enum class can not be implicitly converted to an integer. That assumption snuck back into PointerIntPair. This commit fixes the issue and more importantly adds some unittests to make sure that we do not break this again. rdar://23594806 Reviewers: gribozavr Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D16131 llvm-svn: 257574
103 lines
3.0 KiB
C++
103 lines
3.0 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(PointerIntPairTest, GetSet) {
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struct S {
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int i;
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};
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S s;
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PointerIntPair<S *, 2> Pair(&s, 1U);
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EXPECT_EQ(&s, Pair.getPointer());
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EXPECT_EQ(1U, Pair.getInt());
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Pair.setInt(2);
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EXPECT_EQ(&s, 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(&s, 3U);
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EXPECT_EQ(&s, Pair.getPointer());
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EXPECT_EQ(3U, Pair.getInt());
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// Make sure that we can perform all of our operations on enum classes.
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//
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// The concern is that enum classes are only explicitly convertible to
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// integers. This means that if we assume in PointerIntPair this, a
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// compilation error will result. This group of tests exercises the enum class
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// code to make sure that we do not run into such issues in the future.
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enum class E : unsigned {
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Case1,
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Case2,
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Case3,
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};
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PointerIntPair<S *, 2, E> Pair2(&s, E::Case1);
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EXPECT_EQ(&s, Pair2.getPointer());
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EXPECT_EQ(E::Case1, Pair2.getInt());
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Pair2.setInt(E::Case2);
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EXPECT_EQ(&s, Pair2.getPointer());
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EXPECT_EQ(E::Case2, Pair2.getInt());
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Pair2.setPointer(nullptr);
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EXPECT_EQ(nullptr, Pair2.getPointer());
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EXPECT_EQ(E::Case2, Pair2.getInt());
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Pair2.setPointerAndInt(&s, E::Case3);
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EXPECT_EQ(&s, Pair2.getPointer());
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EXPECT_EQ(E::Case3, Pair2.getInt());
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}
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TEST(PointerIntPairTest, DefaultInitialize) {
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PointerIntPair<float *, 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(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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