[Tarantool-patches] [PATCH luajit 4/4] FFI: Fix ffi.metatype() for non-raw types.

[Sergey Bronnikov]

Hi, Sergey


thanks for the patch! LGTM

On 03.06.2024 17:34, Sergey Kaplun wrote:
> From: Mike Pall <mike>
>
> Reported by 999pingGG.
>
> (cherry picked from commit 4c35a42d9cd3b8be98fa419c68e4724ccdf4f2cf)
>
> This patch is a follow-up to the previous commit. Since the child id is
> used for the index in the lookup table, it has no effect, and metatype
> methods are not overloaded. This patch fixes the behaviour by using the
> correct index.
>
> Sergey Kaplun:
> * added the description and the test for the problem
>
> Part of tarantool/tarantool#9924
> ---
>   src/lib_ffi.c                                     |  2 +-
>   .../lj-861-ctype-attributes.test.lua              | 15 ++++++++++++---
>   2 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/src/lib_ffi.c b/src/lib_ffi.c
> index dfb01658..7ed6fc78 100644
> --- a/src/lib_ffi.c
> +++ b/src/lib_ffi.c
> @@ -776,7 +776,7 @@ LJLIB_CF(ffi_metatype)
>     if (!(ctype_isstruct(ct->info) || ctype_iscomplex(ct->info) ||
>   	ctype_isvector(ct->info)))
>       lj_err_arg(L, 1, LJ_ERR_FFI_INVTYPE);
> -  tv = lj_tab_setinth(L, t, -(int32_t)id);
> +  tv = lj_tab_setinth(L, t, -(int32_t)ctype_typeid(cts, ct));
>     if (!tvisnil(tv))
>       lj_err_caller(L, LJ_ERR_PROTMT);
>     settabV(L, tv, mt);
> diff --git a/test/tarantool-tests/lj-861-ctype-attributes.test.lua b/test/tarantool-tests/lj-861-ctype-attributes.test.lua
> index a407fae0..79121cdb 100644
> --- a/test/tarantool-tests/lj-861-ctype-attributes.test.lua
> +++ b/test/tarantool-tests/lj-861-ctype-attributes.test.lua
> @@ -2,12 +2,14 @@ local tap = require('tap')
>   
>   -- Test file to demonstrate LuaJIT incorrect behaviour during
>   -- parsing and working with ctypes with attributes.
> --- See also:https://github.com/LuaJIT/LuaJIT/issues/861.
> +-- See also:
> +-- *https://github.com/LuaJIT/LuaJIT/issues/861,
> +-- *https://github.com/LuaJIT/LuaJIT/issues/1005.
>   
>   local test = tap.test('lj-861-ctype-attributes')
>   local ffi = require('ffi')
>   
> -test:plan(5)
> +test:plan(6)
>   
>   local EXPECTED_ALIGN = 4
>   
> @@ -37,8 +39,15 @@ test:is(ffi.sizeof('struct test_parsing_sizeof'), EXPECTED_ALIGN,
>   test:is(ffi.sizeof('struct test_parsing_alignof'), EXPECTED_ALIGN,
>           'correct alignof during C parsing')
>   
> -local ok, _ = pcall(ffi.metatype, 's_aligned', {})
> +local EXPECTED_TOSTR = '__tostring overloaded'
> +local ok, obj = pcall(ffi.metatype, 's_aligned', {
> +  __tostring = function()
> +    return EXPECTED_TOSTR
> +  end,
> +})
>   
>   test:ok(ok, 'ffi.metatype is called at the structure with attributes')
> +test:is(tostring(obj()), EXPECTED_TOSTR,
> +        '__tostring is overloaded for the structure with attributes')
>   
>   test:done(true)
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