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unit-tests.cpp
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#include "allocator.hpp"
#include <gtest/gtest.h>
#include <list>
#include <vector>
using namespace extalloc;
namespace {
class Allocator : public ::testing::Test {
public:
Allocator ();
static constexpr std::size_t buffer_size = 256;
std::list<std::vector<std::uint8_t>> buffers_;
allocator alloc_;
};
constexpr std::size_t Allocator::buffer_size;
Allocator::Allocator ()
: alloc_{[this](std::size_t size) {
buffers_.emplace_back (std::max (size, buffer_size));
auto & buffer = buffers_.back ();
return std::pair<uint8_t *, size_t>{buffer.data (), buffer.size ()};
},
std::make_pair (nullptr, std::size_t{0})} {}
} // end anonymous namespace
TEST_F (Allocator, InitialState) {
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 0U);
}
TEST_F (Allocator, BadFree) {
auto v = std::uint8_t{0};
EXPECT_THROW (alloc_.free (&v), std::runtime_error);
}
TEST_F (Allocator, SimpleAllocateThenFree) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, AllocFreeAlloc) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p2);
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, AllocFreeAllocLarger) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (32);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p2);
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, SplitFreeSpace) {
auto p1 = alloc_.allocate (32);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
auto p3 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p3, p1);
EXPECT_EQ (alloc_.num_allocs (), 2U);
EXPECT_EQ (alloc_.num_frees (), 2U);
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p3);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, Free2) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p3 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 3U);
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p3);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, FreeInReverseOrder) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p3 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p3);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 2U);
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 1U);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, FreeInForwardOrder) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 2U);
EXPECT_EQ (alloc_.num_frees (), 1U);
auto p3 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 3U);
EXPECT_EQ (alloc_.num_frees (), 1U);
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 2U);
EXPECT_EQ (alloc_.num_frees (), 2U);
alloc_.free (p3);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 2U);
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (alloc_.num_allocs (), 0U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, GrowStorageTwice) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (buffer_size);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (buffers_.size (), 2U);
alloc_.free (p1);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
}
TEST_F (Allocator, ReallocSameSize) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.realloc (p1, 16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p2);
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, ReallocSmallerNoFollowingFreeSpace) {
auto p1 = alloc_.allocate (buffer_size);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.realloc (p1, 8);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p2);
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, ReallocSmallerWithFollowingFreeSpace) {
auto p1 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.allocate (16);
ASSERT_TRUE (alloc_.check ());
alloc_.free (p2);
ASSERT_TRUE (alloc_.check ());
auto p3 = alloc_.realloc (p1, 8);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p3);
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, ReallocLargerWithFollowingFreeSpace) {
auto p1 = alloc_.allocate (8);
ASSERT_TRUE (alloc_.check ());
auto p2 = alloc_.realloc (p1, 16);
ASSERT_TRUE (alloc_.check ());
EXPECT_EQ (p1, p2);
EXPECT_EQ (alloc_.num_allocs (), 1U);
EXPECT_EQ (alloc_.num_frees (), 1U);
}
TEST_F (Allocator, ReallocLargerWithoutFollowingFreeSpace) {
auto p1 = alloc_.allocate (8);
auto p2 = alloc_.allocate (8);
ASSERT_TRUE (alloc_.check ());
auto p3 = alloc_.realloc (p1, 16);
ASSERT_TRUE (alloc_.check ());
EXPECT_NE (p1, p2);
EXPECT_NE (p1, p3);
EXPECT_EQ (alloc_.num_allocs (), 2U);
EXPECT_EQ (alloc_.num_frees (), 2U);
}