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#include "mempool.h"
#include "test.h"
#define NUM_BLOCKS 10
DEF_MEMPOOL(test_pool, int, NUM_BLOCKS)
static int count(test_pool* pool) {
int count = 0;
mempool_foreach(pool, n, { count++; });
return count;
}
static int sum(test_pool* pool) {
int sum = 0;
mempool_foreach(pool, n, { sum += *n; });
return sum;
}
// Create a statically-backed pool.
TEST_CASE(mempool_create) {
test_pool pool;
mempool_make(&pool);
}
// Create a dynamically-backed pool.
TEST_CASE(mem_create_dyn) {
DEF_MEMPOOL_DYN(dyn_pool, int);
dyn_pool pool;
mempool_make_dyn(&pool, NUM_BLOCKS, sizeof(int));
}
// Allocate all N blocks.
TEST_CASE(mempool_allocate_until_full) {
test_pool pool;
mempool_make(&pool);
for (int i = 0; i < NUM_BLOCKS; ++i) {
const int* block = mempool_alloc(&pool);
TEST_TRUE(block != 0);
}
}
// Allocate all N blocks, then free them.
TEST_CASE(mempool_fill_then_free) {
test_pool pool;
mempool_make(&pool);
int* blocks[NUM_BLOCKS] = {0};
for (int i = 0; i < NUM_BLOCKS; ++i) {
blocks[i] = mempool_alloc(&pool);
TEST_TRUE(blocks[i] != 0);
}
for (int i = 0; i < NUM_BLOCKS; ++i) {
mempool_free(&pool, &blocks[i]);
TEST_EQUAL(blocks[i], 0); // Pointer should be set to 0 on free.
}
TEST_EQUAL(count(&pool), 0);
}
// Attempt to allocate blocks past the maximum pool size.
// The pool should handle the failed allocations gracefully.
TEST_CASE(mempool_allocate_beyond_max_size) {
test_pool pool;
mempool_make(&pool);
mempool_enable_traps(&pool, false);
// Fully allocate the pool.
for (int i = 0; i < NUM_BLOCKS; ++i) {
TEST_TRUE(mempool_alloc(&pool) != 0);
}
// Past the end.
for (int i = 0; i < NUM_BLOCKS; ++i) {
TEST_EQUAL(mempool_alloc(&pool), 0);
}
}
// Free blocks should always remain zeroed out.
// This tests the invariant right after creating the pool.
TEST_CASE(mempool_zero_free_blocks_after_creation) {
test_pool pool;
mempool_make(&pool);
const int zero = 0;
for (int i = 0; i < NUM_BLOCKS; ++i) {
const int* block = (const int*)(pool.blocks) + i;
TEST_EQUAL(memcmp(block, &zero, sizeof(int)), 0);
}
}
// Free blocks should always remain zeroed out.
// This tests the invariant after freeing a block.
TEST_CASE(mempool_zero_free_block_after_free) {
test_pool pool;
mempool_make(&pool);
int* val = mempool_alloc(&pool);
TEST_TRUE(val != 0);
*val = 177;
int* old_val = val;
mempool_free(&pool, &val); // val pointer is set to 0.
TEST_EQUAL(*old_val, 0); // Block is zeroed out after free.
}
// Traverse an empty pool.
TEST_CASE(mempool_traverse_empty) {
test_pool pool;
mempool_make(&pool);
TEST_EQUAL(count(&pool), 0);
}
// Traverse a partially full pool.
TEST_CASE(mempool_traverse_partially_full) {
const int N = NUM_BLOCKS / 2;
test_pool pool;
mempool_make(&pool);
for (int i = 0; i < N; ++i) {
int* val = mempool_alloc(&pool);
TEST_TRUE(val != 0);
*val = i + 1;
}
TEST_EQUAL(sum(&pool), N * (N + 1) / 2);
}
// Traverse a full pool.
TEST_CASE(mempool_traverse_full) {
test_pool pool;
mempool_make(&pool);
for (int i = 0; i < NUM_BLOCKS; ++i) {
int* val = mempool_alloc(&pool);
TEST_TRUE(val != 0);
*val = i + 1;
}
TEST_EQUAL(sum(&pool), NUM_BLOCKS * (NUM_BLOCKS + 1) / 2);
}
// Get the ith (allocated) block.
TEST_CASE(mempool_get_block) {
test_pool pool;
mempool_make(&pool);
for (int i = 0; i < NUM_BLOCKS; ++i) {
int* block = mempool_alloc(&pool);
TEST_TRUE(block != 0);
*block = i;
TEST_EQUAL(mempool_get_block_index(&pool, block), (size_t)i);
}
for (int i = 0; i < NUM_BLOCKS; ++i) {
TEST_EQUAL(*mempool_get_block(&pool, i), i);
}
}
// Clear and re-use an allocator.
TEST_CASE(mem_clear_then_reuse) {
test_pool mem;
mempool_make(&mem);
// Allocate chunks, contents not important.
for (int i = 0; i < NUM_BLOCKS; ++i) {
int* chunk = mempool_alloc(&mem);
TEST_TRUE(chunk != 0);
}
mempool_clear(&mem);
// Allocate chunks and assign values 0..N.
for (int i = 0; i < NUM_BLOCKS; ++i) {
int* chunk = mempool_alloc(&mem);
TEST_TRUE(chunk != 0);
*chunk = i + 1;
}
TEST_EQUAL(sum(&mem), NUM_BLOCKS * (NUM_BLOCKS + 1) / 2);
}
int main() { return 0; }
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