[Tarantool-patches] [PATCH luajit] Restore state when recording __concat metamethod throws an error.
Sergey Kaplun
skaplun at tarantool.org
Fri Sep 13 18:48:55 MSK 2024
One more minor update below.
On 13.09.24, Sergey Kaplun via Tarantool-patches wrote:
> Hi, Sergey!
> Thanks for the review!
>
> On 13.09.24, Sergey Bronnikov wrote:
> > Hi, Sergey,
> >
> > thanks for the patch! LGTM with a minor comment. See below.
> >
> > On 21.08.2024 11:23, Sergey Kaplun wrote:
> >
> >
> > <snipped>
> >
> > > +-- Need to use metamethod call in the concat recording.
> > > +debug.setmetatable(nil, {
> > I propose to add a comment that explain why `nil` is used here.
>
> I've removed the nil usage to avoid confusion.
> Branch is rebased on the current master and force-pushed.
> ===================================================================
> diff --git a/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua b/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
> index 9abaeba5..4fe02708 100644
> --- a/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
> +++ b/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
> @@ -12,12 +12,13 @@ test:plan(2)
>
> jit.opt.start('hotloop=1')
>
> -local __concat = function(v1, v2)
> - return tostring(v1) .. tostring(v2)
> +local __concat = function()
> + return ''
> end
>
> -- Need to use metamethod call in the concat recording.
> -debug.setmetatable(nil, {
> +-- Let's use a table with the metamethod.
> +local concatable_t = setmetatable({}, {
> __concat = __concat,
> })
>
> @@ -31,7 +32,7 @@ local function test_concat_p()
> -- `lj_record_ret()` restore the Lua stack (before the patch),
> -- it becomes unbalanced after the instruction recording
> -- attempt.
> - local _ = {} .. (nil .. nil)
> + local _ = {} .. (concatable_t .. concatable_t)
> end
> end
>
> ===================================================================
Added more verbose description:
===================================================================
diff --git a/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua b/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
index 4fe02708..75736e74 100644
--- a/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
+++ b/test/tarantool-tests/lj-1234-err-in-record-concat.test.lua
@@ -17,7 +17,8 @@ local __concat = function()
end
-- Need to use metamethod call in the concat recording.
--- Let's use a table with the metamethod.
+-- We may use any object with a metamethod, but let's use a table
+-- as the most common one.
local concatable_t = setmetatable({}, {
__concat = __concat,
})
===================================================================
>
> > > + __concat = __concat,
> > > +})
> > > +
>
> <snipped>
>
> --
> Best regards,
> Sergey Kaplun
--
Best regards,
Sergey Kaplun
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