--- /dev/null
+//===- 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 {
+
+// 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_arr
+ [AlignOf<char>::Alignment]
+ [AlignOf<short>::Alignment]
+ [AlignOf<int>::Alignment]
+ [AlignOf<long>::Alignment]
+ [AlignOf<long long>::Alignment]
+ [AlignOf<float>::Alignment]
+ [AlignOf<double>::Alignment]
+ [AlignOf<long double>::Alignment]
+ [AlignOf<void *>::Alignment]
+ [AlignOf<int *>::Alignment]
+ [AlignOf<double (*)(double)>::Alignment]
+ [AlignOf<double (S6::*)()>::Alignment]
+ [AlignOf<A1>::Alignment]
+ [AlignOf<A2>::Alignment]
+ [AlignOf<A4>::Alignment]
+ [AlignOf<A8>::Alignment]
+ [AlignOf<SA1>::Alignment]
+ [AlignOf<SA2>::Alignment]
+ [AlignOf<SA4>::Alignment]
+ [AlignOf<SA8>::Alignment]
+ [AlignOf<S1>::Alignment]
+ [AlignOf<S2>::Alignment]
+ [AlignOf<S3>::Alignment]
+ [AlignOf<S4>::Alignment]
+ [AlignOf<S5>::Alignment]
+ [AlignOf<S6>::Alignment]
+ [AlignOf<D1>::Alignment]
+ [AlignOf<D2>::Alignment]
+ [AlignOf<D3>::Alignment]
+ [AlignOf<D4>::Alignment]
+ [AlignOf<D5>::Alignment]
+ [AlignOf<D6>::Alignment]
+ [AlignOf<D7>::Alignment]
+ [AlignOf<D8>::Alignment]
+ [AlignOf<D9>::Alignment]
+ [AlignOf<V1>::Alignment]
+ [AlignOf<V2>::Alignment]
+ [AlignOf<V3>::Alignment]
+ [AlignOf<V4>::Alignment]
+ [AlignOf<V5>::Alignment]
+ [AlignOf<V6>::Alignment]
+ [AlignOf<V7>::Alignment]
+ [AlignOf<V8>::Alignment];
+
+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<double>(), 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<AlignedCharArray<SA1>::union_type>());
+ EXPECT_LE(2u, alignOf<AlignedCharArray<SA2>::union_type>());
+ EXPECT_LE(4u, alignOf<AlignedCharArray<SA4>::union_type>());
+ EXPECT_LE(8u, alignOf<AlignedCharArray<SA8>::union_type>());
+
+ EXPECT_LE(1u, sizeof(AlignedCharArray<SA1>::union_type));
+ EXPECT_LE(2u, sizeof(AlignedCharArray<SA2>::union_type));
+ EXPECT_LE(4u, sizeof(AlignedCharArray<SA4>::union_type));
+ EXPECT_LE(8u, sizeof(AlignedCharArray<SA8>::union_type));
+
+ EXPECT_EQ(1u, (alignOf<AlignedCharArray<SA1>::union_type>()));
+ EXPECT_EQ(2u, (alignOf<AlignedCharArray<SA1, SA2>::union_type>()));
+ EXPECT_EQ(4u, (alignOf<AlignedCharArray<SA1, SA2, SA4>::union_type>()));
+ EXPECT_EQ(8u, (alignOf<AlignedCharArray<SA1, SA2, SA4, SA8>::union_type>()));
+
+ EXPECT_EQ(1u, sizeof(AlignedCharArray<SA1>::union_type));
+ EXPECT_EQ(2u, sizeof(AlignedCharArray<SA1, SA2>::union_type));
+ EXPECT_EQ(4u, sizeof(AlignedCharArray<SA1, SA2, SA4>::union_type));
+ EXPECT_EQ(8u, sizeof(AlignedCharArray<SA1, SA2, SA4, SA8>::union_type));
+
+ EXPECT_EQ(1u, (alignOf<AlignedCharArray<SA1[1]>::union_type>()));
+ EXPECT_EQ(2u, (alignOf<AlignedCharArray<SA1[2], SA2[1]>::union_type>()));
+ EXPECT_EQ(4u, (alignOf<AlignedCharArray<SA1[42], SA2[55],
+ SA4[13]>::union_type>()));
+ EXPECT_EQ(8u, (alignOf<AlignedCharArray<SA1[2], SA2[1],
+ SA4, SA8>::union_type>()));
+
+ EXPECT_EQ(1u, sizeof(AlignedCharArray<SA1[1]>::union_type));
+ EXPECT_EQ(2u, sizeof(AlignedCharArray<SA1[2], SA2[1]>::union_type));
+ EXPECT_EQ(4u, sizeof(AlignedCharArray<SA1[3], SA2[2], SA4>::union_type));
+ EXPECT_EQ(16u, sizeof(AlignedCharArray<SA1, SA2[3],
+ SA4[3], SA8>::union_type));
+
+ // 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<AlignedCharArray<char>::union_type>());
+ EXPECT_EQ(alignOf<short>(), alignOf<AlignedCharArray<short>::union_type>());
+ EXPECT_EQ(alignOf<int>(), alignOf<AlignedCharArray<int>::union_type>());
+ EXPECT_EQ(alignOf<long>(), alignOf<AlignedCharArray<long>::union_type>());
+ EXPECT_EQ(alignOf<long long>(),
+ alignOf<AlignedCharArray<long long>::union_type>());
+ EXPECT_EQ(alignOf<float>(), alignOf<AlignedCharArray<float>::union_type>());
+ EXPECT_EQ(alignOf<double>(), alignOf<AlignedCharArray<double>::union_type>());
+ EXPECT_EQ(alignOf<long double>(),
+ alignOf<AlignedCharArray<long double>::union_type>());
+ EXPECT_EQ(alignOf<void *>(), alignOf<AlignedCharArray<void *>::union_type>());
+ EXPECT_EQ(alignOf<int *>(), alignOf<AlignedCharArray<int *>::union_type>());
+ EXPECT_EQ(alignOf<double (*)(double)>(),
+ alignOf<AlignedCharArray<double (*)(double)>::union_type>());
+ EXPECT_EQ(alignOf<double (S6::*)()>(),
+ alignOf<AlignedCharArray<double (S6::*)()>::union_type>());
+ EXPECT_EQ(alignOf<S1>(), alignOf<AlignedCharArray<S1>::union_type>());
+ EXPECT_EQ(alignOf<S2>(), alignOf<AlignedCharArray<S2>::union_type>());
+ EXPECT_EQ(alignOf<S3>(), alignOf<AlignedCharArray<S3>::union_type>());
+ EXPECT_EQ(alignOf<S4>(), alignOf<AlignedCharArray<S4>::union_type>());
+ EXPECT_EQ(alignOf<S5>(), alignOf<AlignedCharArray<S5>::union_type>());
+ EXPECT_EQ(alignOf<S6>(), alignOf<AlignedCharArray<S6>::union_type>());
+ EXPECT_EQ(alignOf<D1>(), alignOf<AlignedCharArray<D1>::union_type>());
+ EXPECT_EQ(alignOf<D2>(), alignOf<AlignedCharArray<D2>::union_type>());
+ EXPECT_EQ(alignOf<D3>(), alignOf<AlignedCharArray<D3>::union_type>());
+ EXPECT_EQ(alignOf<D4>(), alignOf<AlignedCharArray<D4>::union_type>());
+ EXPECT_EQ(alignOf<D5>(), alignOf<AlignedCharArray<D5>::union_type>());
+ EXPECT_EQ(alignOf<D6>(), alignOf<AlignedCharArray<D6>::union_type>());
+ EXPECT_EQ(alignOf<D7>(), alignOf<AlignedCharArray<D7>::union_type>());
+ EXPECT_EQ(alignOf<D8>(), alignOf<AlignedCharArray<D8>::union_type>());
+ EXPECT_EQ(alignOf<D9>(), alignOf<AlignedCharArray<D9>::union_type>());
+ EXPECT_EQ(alignOf<V1>(), alignOf<AlignedCharArray<V1>::union_type>());
+ EXPECT_EQ(alignOf<V2>(), alignOf<AlignedCharArray<V2>::union_type>());
+ EXPECT_EQ(alignOf<V3>(), alignOf<AlignedCharArray<V3>::union_type>());
+ EXPECT_EQ(alignOf<V4>(), alignOf<AlignedCharArray<V4>::union_type>());
+ EXPECT_EQ(alignOf<V5>(), alignOf<AlignedCharArray<V5>::union_type>());
+ EXPECT_EQ(alignOf<V6>(), alignOf<AlignedCharArray<V6>::union_type>());
+ EXPECT_EQ(alignOf<V7>(), alignOf<AlignedCharArray<V7>::union_type>());
+ EXPECT_EQ(alignOf<V8>(), alignOf<AlignedCharArray<V8>::union_type>());
+}
+
+}
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