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// Copyright 2023 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 "pw_allocator/allocator.h"
#include <cstddef>
#include "gtest/gtest.h"
#include "pw_allocator/allocator_testing.h"
#include "pw_bytes/alignment.h"
namespace pw::allocator {
namespace {
// Test fixtures.
class AllocatorTest : public ::testing::Test {
protected:
void SetUp() override { EXPECT_EQ(allocator.Init(buffer), OkStatus()); }
void TearDown() override { allocator.DeallocateAll(); }
test::AllocatorForTest allocator;
private:
std::array<std::byte, 256> buffer = {};
};
// Unit tests
TEST_F(AllocatorTest, ReallocateNull) {
constexpr Layout old_layout = Layout::Of<uint32_t>();
size_t new_size = old_layout.size();
void* new_ptr = allocator.Reallocate(nullptr, old_layout, new_size);
// Resize should fail and Reallocate should call Allocate.
EXPECT_EQ(allocator.allocate_size(), new_size);
// Deallocate should not be called.
EXPECT_EQ(allocator.deallocate_ptr(), nullptr);
EXPECT_EQ(allocator.deallocate_size(), 0U);
// Overall, Reallocate should succeed.
EXPECT_NE(new_ptr, nullptr);
}
TEST_F(AllocatorTest, ReallocateZeroNewSize) {
constexpr Layout old_layout = Layout::Of<uint32_t[3]>();
void* ptr = allocator.Allocate(old_layout);
ASSERT_EQ(allocator.allocate_size(), old_layout.size());
ASSERT_NE(ptr, nullptr);
allocator.ResetParameters();
size_t new_size = 0;
void* new_ptr = allocator.Reallocate(ptr, old_layout, new_size);
// Reallocate does not call Resize, Allocate, or Deallocate.
EXPECT_EQ(allocator.resize_ptr(), nullptr);
EXPECT_EQ(allocator.resize_old_size(), 0U);
EXPECT_EQ(allocator.resize_new_size(), 0U);
EXPECT_EQ(allocator.allocate_size(), 0U);
EXPECT_EQ(allocator.deallocate_ptr(), nullptr);
EXPECT_EQ(allocator.deallocate_size(), 0U);
// Overall, Reallocate should fail.
EXPECT_EQ(new_ptr, nullptr);
}
TEST_F(AllocatorTest, ReallocateSame) {
constexpr Layout layout = Layout::Of<uint32_t[3]>();
void* ptr = allocator.Allocate(layout);
ASSERT_EQ(allocator.allocate_size(), layout.size());
ASSERT_NE(ptr, nullptr);
allocator.ResetParameters();
void* new_ptr = allocator.Reallocate(ptr, layout, layout.size());
// Reallocate should call Resize.
EXPECT_EQ(allocator.resize_ptr(), ptr);
EXPECT_EQ(allocator.resize_old_size(), layout.size());
EXPECT_EQ(allocator.resize_new_size(), layout.size());
// Allocate should not be called.
EXPECT_EQ(allocator.allocate_size(), 0U);
// Deallocate should not be called.
EXPECT_EQ(allocator.deallocate_ptr(), nullptr);
EXPECT_EQ(allocator.deallocate_size(), 0U);
// Overall, Reallocate should succeed.
EXPECT_EQ(new_ptr, ptr);
}
TEST_F(AllocatorTest, ReallocateSmaller) {
constexpr Layout old_layout = Layout::Of<uint32_t[3]>();
void* ptr = allocator.Allocate(old_layout);
ASSERT_EQ(allocator.allocate_size(), old_layout.size());
ASSERT_NE(ptr, nullptr);
allocator.ResetParameters();
size_t new_size = sizeof(uint32_t);
void* new_ptr = allocator.Reallocate(ptr, old_layout, new_size);
// Reallocate should call Resize.
EXPECT_EQ(allocator.resize_ptr(), ptr);
EXPECT_EQ(allocator.resize_old_size(), old_layout.size());
EXPECT_EQ(allocator.resize_new_size(), new_size);
// Allocate should not be called.
EXPECT_EQ(allocator.allocate_size(), 0U);
// Deallocate should not be called.
EXPECT_EQ(allocator.deallocate_ptr(), nullptr);
EXPECT_EQ(allocator.deallocate_size(), 0U);
// Overall, Reallocate should succeed.
EXPECT_EQ(new_ptr, ptr);
}
TEST_F(AllocatorTest, ReallocateLarger) {
constexpr Layout old_layout = Layout::Of<uint32_t>();
void* ptr = allocator.Allocate(old_layout);
ASSERT_EQ(allocator.allocate_size(), old_layout.size());
ASSERT_NE(ptr, nullptr);
// The abstraction is a bit leaky here: This tests relies on the details of
// `Resize` in order to get it to fail and fallback to
// allocate/copy/deallocate. Allocate a second block, which should prevent the
// first one from being able to grow.
void* next = allocator.Allocate(old_layout);
ASSERT_EQ(allocator.allocate_size(), old_layout.size());
ASSERT_NE(next, nullptr);
allocator.ResetParameters();
size_t new_size = sizeof(uint32_t[3]);
void* new_ptr = allocator.Reallocate(ptr, old_layout, new_size);
// Reallocate should call Resize.
EXPECT_EQ(allocator.resize_ptr(), ptr);
EXPECT_EQ(allocator.resize_old_size(), old_layout.size());
EXPECT_EQ(allocator.resize_new_size(), new_size);
// Resize should fail and Reallocate should call Allocate.
EXPECT_EQ(allocator.allocate_size(), new_size);
// Deallocate should also be called.
EXPECT_EQ(allocator.deallocate_ptr(), ptr);
EXPECT_EQ(allocator.deallocate_size(), old_layout.size());
// Overall, Reallocate should succeed.
EXPECT_NE(new_ptr, nullptr);
EXPECT_NE(new_ptr, ptr);
}
} // namespace
} // namespace pw::allocator
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