diff options
| -rw-r--r-- | src/mimalloc_arena.zig | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/mimalloc_arena.zig b/src/mimalloc_arena.zig index e2df152fb..e2f7aac60 100644 --- a/src/mimalloc_arena.zig +++ b/src/mimalloc_arena.zig @@ -3,7 +3,7 @@ const builtin = @import("std").builtin; const std = @import("std"); const mimalloc = @import("./allocators/mimalloc.zig"); - +const Environment = @import("./env.zig"); const Allocator = mem.Allocator; const assert = std.debug.assert; @@ -74,7 +74,16 @@ pub const Arena = struct { if (len_align == 0) { return ptr[0..len]; } - return ptr[0..mem.alignBackwardAnyAlign(mimalloc.mi_usable_size(ptr), len_align)]; + + // std.mem.Allocator asserts this, we do it here so we can see the metadata + if (comptime Environment.allow_assert) { + const size = mem.alignBackwardAnyAlign(mimalloc.mi_usable_size(ptr), len_align); + + assert(size >= len); + return ptr[0..size]; + } else { + return ptr[0..mem.alignBackwardAnyAlign(mimalloc.mi_usable_size(ptr), len_align)]; + } } fn resize( |