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// Copyright 2019 The Pigweed Authors
//
// 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
//
// https://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 all of the provided headers, even if they aren't tested.
#include <algorithm>
#include <array>
#include <cinttypes>
#include <cmath>
#include <cstdarg>
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <initializer_list>
#include <iterator>
#include <limits>
#include <new>
#include <string_view>
#include <type_traits>
#include <utility>
#include "pw_preprocessor/compiler.h"
namespace {
// In order to test this file without dependencies on the C++ standard library,
// this file needs to be fully isolated from the regular Pigweed testing
// infrastructure. pw_unit_test's dependencies do compile with the C++ standard
// library, which could conflict with pw_minimal_cpp_stdlib.
//
// SimpleTest provides the basic features of pw_unit_test without dependencies.
class SimpleTest {
public:
virtual ~SimpleTest() = default;
static bool RunAllTests() {
for (SimpleTest* test = all_tests; test != nullptr; test = test->next_) {
test->Run();
if (!test->passed_) {
return false;
}
}
return true;
}
protected:
SimpleTest() : next_(all_tests) { all_tests = this; }
void RecordTestFailure() { passed_ = false; }
private:
virtual void Run() = 0;
static SimpleTest* all_tests;
bool passed_ = true;
SimpleTest* next_;
};
SimpleTest* SimpleTest::all_tests = nullptr;
#define EXPECT_EQ(lhs, rhs) \
do { \
if ((lhs) != (rhs)) { \
RecordTestFailure(); \
} \
} while (0)
#define EXPECT_TRUE(expr) EXPECT_EQ(true, expr)
#define EXPECT_FALSE(expr) EXPECT_EQ(false, expr)
#define EXPECT_STREQ(lhs, rhs) EXPECT_EQ(std::strcmp((lhs), (rhs)), 0)
#define TEST(suite, name) \
class SimpleTest_##suite##_##name : public SimpleTest { \
void Run() override; \
} test_##suite##_##name; \
\
void SimpleTest_##suite##_##name::Run()
TEST(Algorithm, Basic) {
static_assert(std::min(1, 2) == 1);
static_assert(std::max(1, 2) == 2);
EXPECT_EQ(std::forward<int>(2), 2);
}
TEST(Algorithm, Copy) {
constexpr size_t kCopyOffset = 1;
std::array<int, 3> foo{3, 2, 1};
std::array<int, 5> bar{0};
// Ensure zero-element iterator doesn't modify the destination object when
// copied.
int temp = foo[0];
std::copy(foo.end(), foo.end(), bar.begin());
EXPECT_EQ(foo[0], temp);
// Copy a single element.
std::array<int, 1> one{-101};
std::copy(one.begin(), one.end(), foo.begin());
EXPECT_EQ(foo[0], -101);
auto copy_end = std::copy(foo.begin(), foo.end(), bar.begin() + kCopyOffset);
// Verify the iterator points to the end of the copied region.
EXPECT_EQ(copy_end, bar.begin() + foo.size() + kCopyOffset);
// Verify all the values were properly copied from foo to bar.
{
size_t i = 0;
for (auto it = bar.begin() + kCopyOffset; it != copy_end; ++it) {
EXPECT_EQ(*it, foo[i++]);
}
}
}
TEST(Algorithm, Find) {
std::array<int, 5> foo{3, 2, 1, 42, 17};
// Ensure a value in the middle of the array is properly found.
EXPECT_EQ(*std::find(std::begin(foo), std::end(foo), 42), 42);
// Ensure the iterator returned by find() matches the expected location of the
// element.
EXPECT_EQ(std::find(std::begin(foo), std::end(foo), 42), std::begin(foo) + 3);
// Ensure an element at the beginning of an array is found.
EXPECT_EQ(*std::find(std::begin(foo), std::end(foo), 3), foo[0]);
// Ensure an element at the end of an array is found.
EXPECT_EQ(*std::find(std::begin(foo), std::end(foo), 17),
foo[foo.size() - 1]);
}
TEST(Algorithm, NotFound) {
std::array<int, 3> foo{3, 2, 1};
// Ensure that if an element is not found, an iterator matching foo.end() is
// returned.
EXPECT_EQ(std::find(std::begin(foo), std::end(foo), -99), std::end(foo));
// Ensure that a zero-element iterator range returns the end iterator passed
// to std::find().
EXPECT_EQ(std::find(std::end(foo), std::end(foo), 3), std::end(foo));
}
TEST(Array, Basic) {
constexpr std::array<int, 4> array{0, 1, 2, 3};
static_assert(array[2] == 2);
for (int i = 0; i < static_cast<int>(array.size()); ++i) {
EXPECT_EQ(i, array[i]);
}
}
TEST(Cmath, Basic) PW_NO_SANITIZE("float-divide-by-zero") {
EXPECT_EQ(std::abs(-1), 1);
EXPECT_EQ(std::abs(1), 1);
// Although Clang/LLVM do not fully support __STDC_IEC_559__, they do have the
// necessary IEEE 754 support for floating point division by zero.
EXPECT_TRUE(std::isfinite(1.0));
EXPECT_FALSE(std::isfinite(1.0 / 0.0));
EXPECT_FALSE(std::isnan(1.0));
EXPECT_TRUE(std::isnan(0.0 / 0.0));
EXPECT_FALSE(std::signbit(1.0));
EXPECT_TRUE(std::signbit(-1.0));
}
TEST(Cstddef, Basic) {
using std::byte;
byte foo = byte{12};
EXPECT_EQ(foo, byte{12});
}
TEST(Iterator, Basic) {
std::array<int, 3> foo{3, 2, 1};
EXPECT_EQ(std::data(foo), foo.data());
EXPECT_EQ(std::size(foo), foo.size());
EXPECT_EQ(*std::begin(foo), foo[0]);
EXPECT_EQ(std::end(foo), std::begin(foo) + foo.size());
foo.fill(99);
EXPECT_EQ(foo[0], 99);
EXPECT_EQ(foo[1], 99);
EXPECT_EQ(foo[2], 99);
}
template <typename T>
int SumFromInitializerList(std::initializer_list<T> values) {
int sum = 0;
for (auto value : values) {
sum += value;
}
return sum;
}
TEST(InitializerList, Empty) {
std::initializer_list<int> mt;
EXPECT_EQ(0, SumFromInitializerList(mt));
EXPECT_EQ(0, SumFromInitializerList<float>({}));
}
TEST(InitializerList, Declared) {
std::initializer_list<char> list{'\3', '\3', '\4'};
EXPECT_EQ(10, SumFromInitializerList(list));
}
TEST(InitializerList, Inline) {
EXPECT_EQ(42, SumFromInitializerList<long>({42}));
EXPECT_EQ(2, SumFromInitializerList<bool>({true, false, true}));
EXPECT_EQ(15, SumFromInitializerList({1, 2, 3, 4, 5}));
}
TEST(Limits, Basic) {
static_assert(std::numeric_limits<unsigned char>::is_specialized);
static_assert(std::numeric_limits<unsigned char>::is_integer);
static_assert(std::numeric_limits<unsigned char>::min() == 0u);
static_assert(std::numeric_limits<unsigned char>::max() == 255u);
static_assert(std::numeric_limits<signed char>::is_specialized);
static_assert(std::numeric_limits<signed char>::is_integer);
static_assert(std::numeric_limits<signed char>::min() == -128);
static_assert(std::numeric_limits<signed char>::max() == 127);
// Assume 64-bit long long
static_assert(std::numeric_limits<long long>::is_specialized);
static_assert(std::numeric_limits<long long>::is_integer);
static_assert(std::numeric_limits<long long>::min() ==
(-9223372036854775807ll - 1));
static_assert(std::numeric_limits<long long>::max() == 9223372036854775807ll);
static_assert(std::numeric_limits<unsigned long long>::is_specialized);
static_assert(std::numeric_limits<unsigned long long>::is_integer);
static_assert(std::numeric_limits<unsigned long long>::min() == 0u);
static_assert(std::numeric_limits<unsigned long long>::max() ==
18446744073709551615ull);
}
TEST(New, PlacementNew) {
unsigned char value[4];
new (value) int(1234);
int int_value;
std::memcpy(&int_value, value, sizeof(int_value));
EXPECT_EQ(1234, int_value);
}
TEST(New, Launder) {
unsigned char value[4];
int* int_ptr = std::launder(reinterpret_cast<int*>(value));
EXPECT_EQ(static_cast<void*>(int_ptr), static_cast<void*>(value));
}
TEST(StringView, Basic) {
constexpr std::string_view value("1234567890");
static_assert(value.size() == 10);
static_assert(value[1] == '2');
char buffer[] = "!!!!!";
constexpr size_t buffer_size = sizeof(buffer) - 1; // always keep the \0
value.copy(buffer, buffer_size, 10);
EXPECT_STREQ(buffer, "!!!!!");
value.copy(buffer, buffer_size, 9);
EXPECT_STREQ(buffer, "0!!!!");
value.copy(buffer, buffer_size, 2);
EXPECT_STREQ(buffer, "34567");
value.copy(buffer, buffer_size);
EXPECT_STREQ(buffer, "12345");
}
TEST(TypeTraits, Basic) {
static_assert(std::is_integral_v<bool>);
static_assert(!std::is_integral_v<float>);
static_assert(std::is_floating_point_v<float>);
static_assert(!std::is_floating_point_v<bool>);
static_assert(std::is_same_v<float, float>);
static_assert(!std::is_same_v<char, unsigned char>);
}
struct MoveTester {
MoveTester(int value) : magic_value(value), moved(false) {}
MoveTester(const MoveTester&) = default;
MoveTester(MoveTester&& other) : magic_value(other.magic_value), moved(true) {
other.magic_value = 0xffff;
}
int magic_value;
bool moved;
};
TEST(Utility, Move) {
MoveTester test(123);
MoveTester copied(test);
EXPECT_EQ(copied.magic_value, 123);
EXPECT_FALSE(copied.moved);
MoveTester moved(std::move(copied));
EXPECT_EQ(123, moved.magic_value);
EXPECT_EQ(0xffff, copied.magic_value);
EXPECT_TRUE(moved.moved);
}
} // namespace
namespace pw::minimal_cpp_stdlib {
bool RunAllTests() { return SimpleTest::RunAllTests(); }
} // namespace pw::minimal_cpp_stdlib