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Add Assert_mixed_block_layout_v1 macro #2647

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merged 3 commits into from
Jun 4, 2024
Merged

Add Assert_mixed_block_layout_v1 macro #2647

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649b35a
Add Assert_mixed_block_layout_v1 macro
ncik-roberts Jun 3, 2024
1ad3773
Add note about hack
ncik-roberts Jun 3, 2024
e03890b
add macro for runtime 4 as well
ncik-roberts Jun 4, 2024
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16 changes: 16 additions & 0 deletions ocaml/runtime/caml/mlvalues.h
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Original file line number Diff line number Diff line change
Expand Up @@ -540,6 +540,22 @@ CAMLextern value caml_atom(tag_t);

CAMLextern value caml_set_oo_id(value obj);

/* Users write this to assert that the ensuing C code is sensitive
to the current layout of mixed blocks in a way that's subject
to change in future compiler releases. We'll bump the version
number when we make a breaking change. For example, we currently
don't pack int32's efficiently, and we will want to someday.

Users can write:

Assert_mixed_block_layout_v1;

(Hack: we define using _Static_assert rather than just an empty
definition so that users can write a semicolon, which is treated
better by C formatters.)
*/
#define Assert_mixed_block_layout_v1 _Static_assert(1, "")

/* Header for out-of-heap blocks. */

#define Caml_out_of_heap_header_with_reserved(wosize, tag, reserved) \
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