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align_test.cc
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align_test.cc
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// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "starboard/configuration.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace starboard {
namespace nplb {
namespace {
bool IsAligned(void* pointer, size_t alignment) {
return (reinterpret_cast<uintptr_t>(pointer) % alignment) == 0;
}
size_t GetAlignment(void* pointer) {
for (size_t alignment = static_cast<size_t>(1) << ((sizeof(size_t) * 8) - 1);
alignment != 0; alignment /= 2) {
if (IsAligned(pointer, alignment)) {
return alignment;
}
}
return 1;
}
struct AlignedFields {
char unaligned1;
SB_ALIGNAS(2) char by_2;
char unaligned2;
SB_ALIGNAS(4) char by_4;
char unaligned3;
SB_ALIGNAS(8) char by_8;
char unaligned4;
SB_ALIGNAS(16) char by_16;
char unaligned5;
SB_ALIGNAS(32) char by_32;
char unaligned6;
SB_ALIGNAS(64) char by_64;
char unaligned7;
SB_ALIGNAS(128) char by_128;
char unaligned8;
SB_ALIGNAS(256) char by_256;
char unaligned9;
};
struct AlignedFieldsOf {
char unaligned1;
SB_ALIGNAS(SB_ALIGNOF(void*)) char by_void_star;
char unaligned2;
SB_ALIGNAS(SB_ALIGNOF(int)) char by_int;
char unaligned3;
SB_ALIGNAS(SB_ALIGNOF(uint64_t)) char by_uint64_t;
char unaligned4;
};
TEST(SbAlignTest, AlignAsStructFieldOnStack) {
char unaligned = 0;
EXPECT_NE(1, unaligned);
AlignedFields aligned;
EXPECT_LE(2, GetAlignment(&(aligned.by_2)));
EXPECT_LE(4, GetAlignment(&(aligned.by_4)));
EXPECT_LE(8, GetAlignment(&(aligned.by_8)));
EXPECT_LE(16, GetAlignment(&(aligned.by_16)));
EXPECT_LE(32, GetAlignment(&(aligned.by_32)));
EXPECT_LE(64, GetAlignment(&(aligned.by_64)));
EXPECT_LE(128, GetAlignment(&(aligned.by_128)));
EXPECT_LE(256, GetAlignment(&(aligned.by_256)));
}
TEST(SbAlignTest, AlignAsStackVariable) {
char unaligned1 = 1;
SB_ALIGNAS(2) char by_2;
char unaligned2 = 2;
EXPECT_NE(unaligned2, unaligned1); // These are to try to keep the stack
// variables around.
SB_ALIGNAS(4) char by_4;
char unaligned3 = 3;
EXPECT_NE(unaligned3, unaligned1);
SB_ALIGNAS(8) char by_8;
char unaligned4 = 4;
EXPECT_NE(unaligned4, unaligned1);
SB_ALIGNAS(16) char by_16;
char unaligned5 = 5;
EXPECT_NE(unaligned5, unaligned1);
EXPECT_LE(2, GetAlignment(&by_2));
EXPECT_LE(4, GetAlignment(&by_4));
EXPECT_LE(8, GetAlignment(&by_8));
EXPECT_LE(16, GetAlignment(&by_16));
SB_ALIGNAS(32) char by_32;
char unaligned6 = 6;
EXPECT_NE(unaligned6, unaligned1);
SB_ALIGNAS(64) char by_64;
char unaligned7 = 7;
EXPECT_NE(unaligned7, unaligned1);
SB_ALIGNAS(128) char by_128;
char unaligned8 = 8;
EXPECT_NE(unaligned8, unaligned1);
SB_ALIGNAS(256) char by_256;
char unaligned9 = 9;
EXPECT_NE(unaligned9, unaligned1);
EXPECT_LE(32, GetAlignment(&by_32));
EXPECT_LE(64, GetAlignment(&by_64));
EXPECT_LE(128, GetAlignment(&by_128));
EXPECT_LE(256, GetAlignment(&by_256));
}
TEST(SbAlignTest, AlignOf) {
EXPECT_LE(sizeof(uint8_t), SB_ALIGNOF(uint8_t));
EXPECT_LE(sizeof(uint16_t), SB_ALIGNOF(uint16_t));
EXPECT_LE(sizeof(uint32_t), SB_ALIGNOF(uint32_t));
EXPECT_LE(sizeof(uint64_t), SB_ALIGNOF(uint64_t));
EXPECT_LE(sizeof(uintptr_t), SB_ALIGNOF(uintptr_t));
EXPECT_LE(sizeof(void*), SB_ALIGNOF(void*));
}
TEST(SbAlignTest, AlignAsAlignOfStructFieldOnStack) {
char unaligned = 0;
EXPECT_NE(1, unaligned);
AlignedFieldsOf aligned;
EXPECT_LE(SB_ALIGNOF(void*), GetAlignment(&(aligned.by_void_star)));
EXPECT_LE(SB_ALIGNOF(int), GetAlignment(&(aligned.by_int)));
EXPECT_LE(SB_ALIGNOF(uint64_t), GetAlignment(&(aligned.by_uint64_t)));
}
TEST(SbAlignTest, AlignAsAlignOfStackVariable) {
char unaligned = 0;
EXPECT_NE(1, unaligned);
SB_ALIGNAS(SB_ALIGNOF(void*)) char by_void_star;
SB_ALIGNAS(SB_ALIGNOF(int)) char by_int;
SB_ALIGNAS(SB_ALIGNOF(uint64_t)) char by_uint64_t;
EXPECT_LE(SB_ALIGNOF(void*), GetAlignment(&by_void_star));
EXPECT_LE(SB_ALIGNOF(int), GetAlignment(&by_int));
EXPECT_LE(SB_ALIGNOF(uint64_t), GetAlignment(&by_uint64_t));
}
} // namespace
} // namespace nplb
} // namespace starboard