Many issues:
- heapmem[] is of type uint64_t meaning that it contains HEAP_SZ * 16
bytes but the heap is initialized with only 1/16 of that, making
this test's memory footprint way too large.
- The test to ensure the heap is empty uses an allocation size of
(heap_end - heap_start - 8) which is wrong as heap_end and heap_start
are uint64_t pointer types and therefore their difference will be 8x
smaller than intended. Furthermore, the 8 here is unnessary as the
chunk header size is already included in the location of heap_start.
- The heap start address misalignment bare no purpose as the misaligned
start of the free heap is already controlled by the variable prefix
allocation size.
- Alignment and sizes should rather be expressed in terms of size_t
rather than uintptr_t.
Fix those issues, and add a few more test angles:
- Make the prefix allocation itterate across the entire alignment range
to exercize all possible misalignments.
- Vary the aligned allocation size to better exercize the pre-alignment
allocation and suffix handling.
- Double the aligned allocation to add more variability in the heap
structure.
- Test the testing of emptiness by making sure that no more allocations
are possible when we think we allocated it all.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
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