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Fix Arena realloc bug

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This commit is contained in:
Andrew Noyes
2025-08-28 13:27:53 -04:00
parent a32356e298
commit a73a463936
1 changed files with 20 additions and 23 deletions
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7
src/arena_allocator.cpp
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@@ -77,11 +77,7 @@ void *ArenaAllocator::realloc_raw(void *ptr, uint32_t old_size,
assert(current_block_ && assert(current_block_ &&
"realloc called with non-null ptr but no current block exists"); "realloc called with non-null ptr but no current block exists");
// Assert that offset is large enough (should always be true for if (current_block_->offset >= old_size) {
// valid callers)
assert(current_block_->offset >= old_size &&
"offset must be >= old_size for valid last allocation");
// Check if this was the last allocation by comparing with expected location // Check if this was the last allocation by comparing with expected location
char *expected_last_alloc_start = char *expected_last_alloc_start =
current_block_->data() + current_block_->offset - old_size; current_block_->data() + current_block_->offset - old_size;
@@ -105,6 +101,7 @@ void *ArenaAllocator::realloc_raw(void *ptr, uint32_t old_size,
return new_size == 0 ? nullptr : ptr; return new_size == 0 ? nullptr : ptr;
} }
} }
}
// Can't extend in place // Can't extend in place
if (new_size == 0) { if (new_size == 0) {