-//===- llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ----===//
+//=== - llvm/unittest/Support/AlignOfTest.cpp - Alignment utility tests ----===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
+#ifdef _MSC_VER
+// Disable warnings about alignment-based structure padding.
+// This must be above the includes to suppress warnings in included templates.
+#pragma warning(disable:4324)
+#endif
+
#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
+// Suppress direct base '{anonymous}::S1' inaccessible in '{anonymous}::D9'
+// due to ambiguity warning.
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wunknown-pragmas"
+#pragma clang diagnostic ignored "-Winaccessible-base"
+#elif ((__GNUC__ * 100) + __GNUC_MINOR__) >= 402
+// Pragma based warning suppression was introduced in GGC 4.2. Additionally
+// this warning is "enabled by default". The warning still appears if -Wall is
+// suppressed. Apparently GCC suppresses it when -w is specifed, which is odd.
+#pragma GCC diagnostic warning "-w"
+#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)));
+#if __has_feature(cxx_alignas)
+struct alignas(1) A1 { };
+struct alignas(2) A2 { };
+struct alignas(4) A4 { };
+struct alignas(8) A8 { };
+#elif defined(__GNUC__)
+struct A1 { } __attribute__((aligned(1)));
+struct A2 { } __attribute__((aligned(2)));
+struct A4 { } __attribute__((aligned(4)));
+struct 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;
+__declspec(align(1)) struct A1 { };
+__declspec(align(2)) struct A2 { };
+__declspec(align(4)) struct A4 { };
+__declspec(align(8)) struct 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 V7 : virtual V2, virtual V6 { virtual ~V7(); };
struct V8 : V5, virtual V6, V7 { double zz; virtual ~V8(); };
+double S6::f() { return 0.0; }
+float D2::g() { return 0.0f; }
+V1::~V1() {}
+V2::~V2() {}
+V3::~V3() {}
+V4::~V4() {}
+V5::~V5() {}
+V6::~V6() {}
+V7::~V7() {}
+V8::~V8() {}
+
// Ensure alignment is a compile-time constant.
char LLVM_ATTRIBUTE_UNUSED test_arr1
[AlignOf<char>::Alignment > 0]
[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];
+ [AlignOf<A8>::Alignment > 0];
char LLVM_ATTRIBUTE_UNUSED test_arr3
[AlignOf<S1>::Alignment > 0]
[AlignOf<S2>::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_LE(1u, alignOf<A1>());
+ EXPECT_LE(2u, alignOf<A2>());
+ EXPECT_LE(4u, alignOf<A4>());
+ EXPECT_LE(8u, alignOf<A8>());
EXPECT_EQ(1u, alignOf<char>());
EXPECT_LE(alignOf<char>(), alignOf<short>());
}
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, alignOf<AlignedCharArrayUnion<A1> >());
+ EXPECT_LE(2u, alignOf<AlignedCharArrayUnion<A2> >());
+ EXPECT_LE(4u, alignOf<AlignedCharArrayUnion<A4> >());
+ EXPECT_LE(8u, alignOf<AlignedCharArrayUnion<A8> >());
- 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_LE(1u, sizeof(AlignedCharArrayUnion<A1>));
+ EXPECT_LE(2u, sizeof(AlignedCharArrayUnion<A2>));
+ EXPECT_LE(4u, sizeof(AlignedCharArrayUnion<A4>));
+ EXPECT_LE(8u, sizeof(AlignedCharArrayUnion<A8>));
- 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, (alignOf<AlignedCharArrayUnion<A1> >()));
+ EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1, A2> >()));
+ EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1, A2, A4> >()));
+ EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1, A2, A4, A8> >()));
- 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, sizeof(AlignedCharArrayUnion<A1>));
+ EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1, A2>));
+ EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1, A2, A4>));
+ EXPECT_EQ(8u, sizeof(AlignedCharArrayUnion<A1, A2, A4, A8>));
- 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, (alignOf<AlignedCharArrayUnion<A1[1]> >()));
+ EXPECT_EQ(2u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1]> >()));
+ EXPECT_EQ(4u, (alignOf<AlignedCharArrayUnion<A1[42], A2[55],
+ A4[13]> >()));
+ EXPECT_EQ(8u, (alignOf<AlignedCharArrayUnion<A1[2], A2[1],
+ A4, A8> >()));
- 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>));
+ EXPECT_EQ(1u, sizeof(AlignedCharArrayUnion<A1[1]>));
+ EXPECT_EQ(2u, sizeof(AlignedCharArrayUnion<A1[2], A2[1]>));
+ EXPECT_EQ(4u, sizeof(AlignedCharArrayUnion<A1[3], A2[2], A4>));
+ EXPECT_EQ(16u, sizeof(AlignedCharArrayUnion<A1, A2[3],
+ A4[3], A8>));
// 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
#ifndef _MSC_VER
EXPECT_EQ(sizeof(V8), sizeof(AlignedCharArrayUnion<V8>));
#endif
-}
+ EXPECT_EQ(1u, (alignOf<AlignedCharArray<1, 1> >()));
+ EXPECT_EQ(2u, (alignOf<AlignedCharArray<2, 1> >()));
+ EXPECT_EQ(4u, (alignOf<AlignedCharArray<4, 1> >()));
+ EXPECT_EQ(8u, (alignOf<AlignedCharArray<8, 1> >()));
+ EXPECT_EQ(16u, (alignOf<AlignedCharArray<16, 1> >()));
+
+ EXPECT_EQ(1u, sizeof(AlignedCharArray<1, 1>));
+ EXPECT_EQ(7u, sizeof(AlignedCharArray<1, 7>));
+ EXPECT_EQ(2u, sizeof(AlignedCharArray<2, 2>));
+ EXPECT_EQ(16u, sizeof(AlignedCharArray<2, 16>));
+}
}
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