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llvm-project/llvm/unittests/Support/AlignOfTest.cpp

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//===- llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/AlignOf.h"
#include "llvm/Support/Compiler.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// Disable warnings about questionable type definitions.
// We're testing that even questionable types work with the alignment utilities.
#ifdef _MSC_VER
#pragma warning(disable:4584)
#endif
// Define some fixed alignment types to use in these tests.
#if __cplusplus == 201103L || __has_feature(cxx_alignas)
typedef char alignas(1) A1;
typedef char alignas(2) A2;
typedef char alignas(4) A4;
typedef char alignas(8) A8;
#elif defined(__clang__) || defined(__GNUC__)
typedef char A1 __attribute__((aligned(1)));
typedef char A2 __attribute__((aligned(2)));
typedef char A4 __attribute__((aligned(4)));
typedef char A8 __attribute__((aligned(8)));
#elif defined(_MSC_VER)
typedef __declspec(align(1)) char A1;
typedef __declspec(align(2)) char A2;
typedef __declspec(align(4)) char A4;
typedef __declspec(align(8)) char A8;
#else
# error No supported align as directive.
#endif
// Wrap the forced aligned types in structs to hack around compiler bugs.
struct SA1 { A1 a; };
struct SA2 { A2 a; };
struct SA4 { A4 a; };
struct SA8 { A8 a; };
struct S1 {};
struct S2 { char a; };
struct S3 { int x; };
struct S4 { double y; };
struct S5 { A1 a1; A2 a2; A4 a4; A8 a8; };
struct S6 { double f(); };
struct D1 : S1 {};
struct D2 : S6 { float g(); };
struct D3 : S2 {};
struct D4 : S2 { int x; };
struct D5 : S3 { char c; };
struct D6 : S2, S3 {};
struct D7 : S1, S3 {};
struct D8 : S1, D4, D5 { double x[2]; };
struct D9 : S1, D1 { S1 s1; };
struct V1 { virtual ~V1(); };
struct V2 { int x; virtual ~V2(); };
struct V3 : V1 { virtual ~V3(); };
struct V4 : virtual V2 { int y; virtual ~V4(); };
struct V5 : V4, V3 { double z; virtual ~V5(); };
struct V6 : S1 { virtual ~V6(); };
struct V7 : virtual V2, virtual V6 { virtual ~V7(); };
struct V8 : V5, virtual V6, V7 { double zz; virtual ~V8(); };
// Ensure alignment is a compile-time constant.
char LLVM_ATTRIBUTE_UNUSED test_arr1
[AlignOf<char>::Alignment > 0]
[AlignOf<short>::Alignment > 0]
[AlignOf<int>::Alignment > 0]
[AlignOf<long>::Alignment > 0]
[AlignOf<long long>::Alignment > 0]
[AlignOf<float>::Alignment > 0]
[AlignOf<double>::Alignment > 0]
[AlignOf<long double>::Alignment > 0]
[AlignOf<void *>::Alignment > 0]
[AlignOf<int *>::Alignment > 0]
[AlignOf<double (*)(double)>::Alignment > 0]
[AlignOf<double (S6::*)()>::Alignment > 0];
char LLVM_ATTRIBUTE_UNUSED test_arr2
[AlignOf<A1>::Alignment > 0]
[AlignOf<A2>::Alignment > 0]
[AlignOf<A4>::Alignment > 0]
[AlignOf<A8>::Alignment > 0]
[AlignOf<SA1>::Alignment > 0]
[AlignOf<SA2>::Alignment > 0]
[AlignOf<SA4>::Alignment > 0]
[AlignOf<SA8>::Alignment > 0];
char LLVM_ATTRIBUTE_UNUSED test_arr3
[AlignOf<S1>::Alignment > 0]
[AlignOf<S2>::Alignment > 0]
[AlignOf<S3>::Alignment > 0]
[AlignOf<S4>::Alignment > 0]
[AlignOf<S5>::Alignment > 0]
[AlignOf<S6>::Alignment > 0];
char LLVM_ATTRIBUTE_UNUSED test_arr4
[AlignOf<D1>::Alignment > 0]
[AlignOf<D2>::Alignment > 0]
[AlignOf<D3>::Alignment > 0]
[AlignOf<D4>::Alignment > 0]
[AlignOf<D5>::Alignment > 0]
[AlignOf<D6>::Alignment > 0]
[AlignOf<D7>::Alignment > 0]
[AlignOf<D8>::Alignment > 0]
[AlignOf<D9>::Alignment > 0];
char LLVM_ATTRIBUTE_UNUSED test_arr5
[AlignOf<V1>::Alignment > 0]
[AlignOf<V2>::Alignment > 0]
[AlignOf<V3>::Alignment > 0]
[AlignOf<V4>::Alignment > 0]
[AlignOf<V5>::Alignment > 0]
[AlignOf<V6>::Alignment > 0]
[AlignOf<V7>::Alignment > 0]
[AlignOf<V8>::Alignment > 0];
TEST(AlignOfTest, BasicAlignmentInvariants) {
// For a very strange reason, many compilers do not support this. Both Clang
// and GCC fail to align these properly.
EXPECT_EQ(1u, alignOf<A1>());
#if 0
EXPECT_EQ(2u, alignOf<A2>());
EXPECT_EQ(4u, alignOf<A4>());
EXPECT_EQ(8u, alignOf<A8>());
#endif
// But once wrapped in structs, the alignment is correctly managed.
EXPECT_LE(1u, alignOf<SA1>());
EXPECT_LE(2u, alignOf<SA2>());
EXPECT_LE(4u, alignOf<SA4>());
EXPECT_LE(8u, alignOf<SA8>());
EXPECT_EQ(1u, alignOf<char>());
EXPECT_LE(alignOf<char>(), alignOf<short>());
EXPECT_LE(alignOf<short>(), alignOf<int>());
EXPECT_LE(alignOf<int>(), alignOf<long>());
EXPECT_LE(alignOf<long>(), alignOf<long long>());
EXPECT_LE(alignOf<char>(), alignOf<float>());
EXPECT_LE(alignOf<float>(), alignOf<double>());
EXPECT_LE(alignOf<char>(), alignOf<long double>());
EXPECT_LE(alignOf<char>(), alignOf<void *>());
EXPECT_EQ(alignOf<void *>(), alignOf<int *>());
EXPECT_LE(alignOf<char>(), alignOf<S1>());
EXPECT_LE(alignOf<S1>(), alignOf<S2>());
EXPECT_LE(alignOf<S1>(), alignOf<S3>());
EXPECT_LE(alignOf<S1>(), alignOf<S4>());
EXPECT_LE(alignOf<S1>(), alignOf<S5>());
EXPECT_LE(alignOf<S1>(), alignOf<S6>());
EXPECT_LE(alignOf<S1>(), alignOf<D1>());
EXPECT_LE(alignOf<S1>(), alignOf<D2>());
EXPECT_LE(alignOf<S1>(), alignOf<D3>());
EXPECT_LE(alignOf<S1>(), alignOf<D4>());
EXPECT_LE(alignOf<S1>(), alignOf<D5>());
EXPECT_LE(alignOf<S1>(), alignOf<D6>());
EXPECT_LE(alignOf<S1>(), alignOf<D7>());
EXPECT_LE(alignOf<S1>(), alignOf<D8>());
EXPECT_LE(alignOf<S1>(), alignOf<D9>());
EXPECT_LE(alignOf<S1>(), alignOf<V1>());
EXPECT_LE(alignOf<V1>(), alignOf<V2>());
EXPECT_LE(alignOf<V1>(), alignOf<V3>());
EXPECT_LE(alignOf<V1>(), alignOf<V4>());
EXPECT_LE(alignOf<V1>(), alignOf<V5>());
EXPECT_LE(alignOf<V1>(), alignOf<V6>());
EXPECT_LE(alignOf<V1>(), alignOf<V7>());
EXPECT_LE(alignOf<V1>(), alignOf<V8>());
}
TEST(AlignOfTest, BasicAlignedArray) {
// Note: this code exclusively uses the struct-wrapped arbitrarily aligned
// types because of the bugs mentioned above where GCC and Clang both
// disregard the arbitrary alignment specifier until the type is used to
// declare a member of a struct.
EXPECT_LE(1u, alignOf<AlignedCharArrayUnion<SA1> >());
EXPECT_LE(2u, alignOf<AlignedCharArrayUnion<SA2> >());
EXPECT_LE(4u, alignOf<AlignedCharArrayUnion<SA4> >());
EXPECT_LE(8u, alignOf<AlignedCharArrayUnion<SA8> >());
EXPECT_LE(1u, sizeof(AlignedCharArrayUnion<SA1>));
EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<SA2>));
EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<SA4>));
EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<SA8>));
EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<SA1> >()));
EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<SA1, SA2> >()));
EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<SA1, SA2, SA4> >()));
EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<SA1, SA2, SA4, SA8> >()));
EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<SA1>));
EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<SA1, SA2>));
EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<SA1, SA2, SA4>));
EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<SA1, SA2, SA4, SA8>));
EXPECT_EQ(1u, (alignOf<AlignedCharArrayUnion<SA1[1]> >()));
EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<SA1[2], SA2[1]> >()));
EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<SA1[42], SA2[55],
SA4[13]> >()));
EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<SA1[2], SA2[1],
SA4, SA8> >()));
EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<SA1[1]>));
EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<SA1[2], SA2[1]>));
EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<SA1[3], SA2[2], SA4>));
EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<SA1, SA2[3],
SA4[3], SA8>));
// For other tests we simply assert that the alignment of the union mathes
// that of the fundamental type and hope that we have any weird type
// productions that would trigger bugs.
EXPECT_EQ(alignOf<char>(), alignOf<AlignedCharArrayUnion<char> >());
EXPECT_EQ(alignOf<short>(), alignOf<AlignedCharArrayUnion<short> >());
EXPECT_EQ(alignOf<int>(), alignOf<AlignedCharArrayUnion<int> >());
EXPECT_EQ(alignOf<long>(), alignOf<AlignedCharArrayUnion<long> >());
EXPECT_EQ(alignOf<long long>(),
alignOf<AlignedCharArrayUnion<long long> >());
EXPECT_EQ(alignOf<float>(), alignOf<AlignedCharArrayUnion<float> >());
EXPECT_EQ(alignOf<double>(), alignOf<AlignedCharArrayUnion<double> >());
EXPECT_EQ(alignOf<long double>(),
alignOf<AlignedCharArrayUnion<long double> >());
EXPECT_EQ(alignOf<void *>(), alignOf<AlignedCharArrayUnion<void *> >());
EXPECT_EQ(alignOf<int *>(), alignOf<AlignedCharArrayUnion<int *> >());
EXPECT_EQ(alignOf<double (*)(double)>(),
alignOf<AlignedCharArrayUnion<double (*)(double)> >());
EXPECT_EQ(alignOf<double (S6::*)()>(),
alignOf<AlignedCharArrayUnion<double (S6::*)()> >());
EXPECT_EQ(alignOf<S1>(), alignOf<AlignedCharArrayUnion<S1> >());
EXPECT_EQ(alignOf<S2>(), alignOf<AlignedCharArrayUnion<S2> >());
EXPECT_EQ(alignOf<S3>(), alignOf<AlignedCharArrayUnion<S3> >());
EXPECT_EQ(alignOf<S4>(), alignOf<AlignedCharArrayUnion<S4> >());
EXPECT_EQ(alignOf<S5>(), alignOf<AlignedCharArrayUnion<S5> >());
EXPECT_EQ(alignOf<S6>(), alignOf<AlignedCharArrayUnion<S6> >());
EXPECT_EQ(alignOf<D1>(), alignOf<AlignedCharArrayUnion<D1> >());
EXPECT_EQ(alignOf<D2>(), alignOf<AlignedCharArrayUnion<D2> >());
EXPECT_EQ(alignOf<D3>(), alignOf<AlignedCharArrayUnion<D3> >());
EXPECT_EQ(alignOf<D4>(), alignOf<AlignedCharArrayUnion<D4> >());
EXPECT_EQ(alignOf<D5>(), alignOf<AlignedCharArrayUnion<D5> >());
EXPECT_EQ(alignOf<D6>(), alignOf<AlignedCharArrayUnion<D6> >());
EXPECT_EQ(alignOf<D7>(), alignOf<AlignedCharArrayUnion<D7> >());
EXPECT_EQ(alignOf<D8>(), alignOf<AlignedCharArrayUnion<D8> >());
EXPECT_EQ(alignOf<D9>(), alignOf<AlignedCharArrayUnion<D9> >());
EXPECT_EQ(alignOf<V1>(), alignOf<AlignedCharArrayUnion<V1> >());
EXPECT_EQ(alignOf<V2>(), alignOf<AlignedCharArrayUnion<V2> >());
EXPECT_EQ(alignOf<V3>(), alignOf<AlignedCharArrayUnion<V3> >());
EXPECT_EQ(alignOf<V4>(), alignOf<AlignedCharArrayUnion<V4> >());
EXPECT_EQ(alignOf<V5>(), alignOf<AlignedCharArrayUnion<V5> >());
EXPECT_EQ(alignOf<V6>(), alignOf<AlignedCharArrayUnion<V6> >());
EXPECT_EQ(alignOf<V7>(), alignOf<AlignedCharArrayUnion<V7> >());
// Some versions of MSVC get this wrong somewhat disturbingly. The failure
// appears to be benign: alignOf<V8>() produces a preposterous value: 12
#ifndef _MSC_VER
EXPECT_EQ(alignOf<V8>(), alignOf<AlignedCharArrayUnion<V8> >());
#endif
EXPECT_EQ(sizeof(char), sizeof(AlignedCharArrayUnion<char>));
EXPECT_EQ(sizeof(char[1]), sizeof(AlignedCharArrayUnion<char[1]>));
EXPECT_EQ(sizeof(char[2]), sizeof(AlignedCharArrayUnion<char[2]>));
EXPECT_EQ(sizeof(char[3]), sizeof(AlignedCharArrayUnion<char[3]>));
EXPECT_EQ(sizeof(char[4]), sizeof(AlignedCharArrayUnion<char[4]>));
EXPECT_EQ(sizeof(char[5]), sizeof(AlignedCharArrayUnion<char[5]>));
EXPECT_EQ(sizeof(char[8]), sizeof(AlignedCharArrayUnion<char[8]>));
EXPECT_EQ(sizeof(char[13]), sizeof(AlignedCharArrayUnion<char[13]>));
EXPECT_EQ(sizeof(char[16]), sizeof(AlignedCharArrayUnion<char[16]>));
EXPECT_EQ(sizeof(char[21]), sizeof(AlignedCharArrayUnion<char[21]>));
EXPECT_EQ(sizeof(char[32]), sizeof(AlignedCharArrayUnion<char[32]>));
EXPECT_EQ(sizeof(short), sizeof(AlignedCharArrayUnion<short>));
EXPECT_EQ(sizeof(int), sizeof(AlignedCharArrayUnion<int>));
EXPECT_EQ(sizeof(long), sizeof(AlignedCharArrayUnion<long>));
EXPECT_EQ(sizeof(long long),
sizeof(AlignedCharArrayUnion<long long>));
EXPECT_EQ(sizeof(float), sizeof(AlignedCharArrayUnion<float>));
EXPECT_EQ(sizeof(double), sizeof(AlignedCharArrayUnion<double>));
EXPECT_EQ(sizeof(long double),
sizeof(AlignedCharArrayUnion<long double>));
EXPECT_EQ(sizeof(void *), sizeof(AlignedCharArrayUnion<void *>));
EXPECT_EQ(sizeof(int *), sizeof(AlignedCharArrayUnion<int *>));
EXPECT_EQ(sizeof(double (*)(double)),
sizeof(AlignedCharArrayUnion<double (*)(double)>));
EXPECT_EQ(sizeof(double (S6::*)()),
sizeof(AlignedCharArrayUnion<double (S6::*)()>));
EXPECT_EQ(sizeof(S1), sizeof(AlignedCharArrayUnion<S1>));
EXPECT_EQ(sizeof(S2), sizeof(AlignedCharArrayUnion<S2>));
EXPECT_EQ(sizeof(S3), sizeof(AlignedCharArrayUnion<S3>));
EXPECT_EQ(sizeof(S4), sizeof(AlignedCharArrayUnion<S4>));
EXPECT_EQ(sizeof(S5), sizeof(AlignedCharArrayUnion<S5>));
EXPECT_EQ(sizeof(S6), sizeof(AlignedCharArrayUnion<S6>));
EXPECT_EQ(sizeof(D1), sizeof(AlignedCharArrayUnion<D1>));
EXPECT_EQ(sizeof(D2), sizeof(AlignedCharArrayUnion<D2>));
EXPECT_EQ(sizeof(D3), sizeof(AlignedCharArrayUnion<D3>));
EXPECT_EQ(sizeof(D4), sizeof(AlignedCharArrayUnion<D4>));
EXPECT_EQ(sizeof(D5), sizeof(AlignedCharArrayUnion<D5>));
EXPECT_EQ(sizeof(D6), sizeof(AlignedCharArrayUnion<D6>));
EXPECT_EQ(sizeof(D7), sizeof(AlignedCharArrayUnion<D7>));
EXPECT_EQ(sizeof(D8), sizeof(AlignedCharArrayUnion<D8>));
EXPECT_EQ(sizeof(D9), sizeof(AlignedCharArrayUnion<D9>));
EXPECT_EQ(sizeof(D9[1]), sizeof(AlignedCharArrayUnion<D9[1]>));
EXPECT_EQ(sizeof(D9[2]), sizeof(AlignedCharArrayUnion<D9[2]>));
EXPECT_EQ(sizeof(D9[3]), sizeof(AlignedCharArrayUnion<D9[3]>));
EXPECT_EQ(sizeof(D9[4]), sizeof(AlignedCharArrayUnion<D9[4]>));
EXPECT_EQ(sizeof(D9[5]), sizeof(AlignedCharArrayUnion<D9[5]>));
EXPECT_EQ(sizeof(D9[8]), sizeof(AlignedCharArrayUnion<D9[8]>));
EXPECT_EQ(sizeof(D9[13]), sizeof(AlignedCharArrayUnion<D9[13]>));
EXPECT_EQ(sizeof(D9[16]), sizeof(AlignedCharArrayUnion<D9[16]>));
EXPECT_EQ(sizeof(D9[21]), sizeof(AlignedCharArrayUnion<D9[21]>));
EXPECT_EQ(sizeof(D9[32]), sizeof(AlignedCharArrayUnion<D9[32]>));
EXPECT_EQ(sizeof(V1), sizeof(AlignedCharArrayUnion<V1>));
EXPECT_EQ(sizeof(V2), sizeof(AlignedCharArrayUnion<V2>));
EXPECT_EQ(sizeof(V3), sizeof(AlignedCharArrayUnion<V3>));
EXPECT_EQ(sizeof(V4), sizeof(AlignedCharArrayUnion<V4>));
EXPECT_EQ(sizeof(V5), sizeof(AlignedCharArrayUnion<V5>));
EXPECT_EQ(sizeof(V6), sizeof(AlignedCharArrayUnion<V6>));
EXPECT_EQ(sizeof(V7), sizeof(AlignedCharArrayUnion<V7>));
// Some versions of MSVC also get this wrong. The failure again appears to be
// benign: sizeof(V8) is only 52 bytes, but our array reserves 56.
#ifndef _MSC_VER
EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>));
#endif
}
}
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