Hi, Sergey!

thanks for the patch!

see comments below

This patch names all subtests and includes the test in <index>.
The test with calls with 10 arguments with sizes less than 8 bits are
dummy for M1. This suite lacks a mechanism to skip subtests satisfying
complicated conditions, so it is done manually by the corresponding `if`
check.

Part of tarantool/tarantool#9398
---
 test/LuaJIT-tests/lib/ffi/ffi_callback.lua | 33 +++++++++++-----------
 test/LuaJIT-tests/lib/ffi/index            |  1 +
 2 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/test/LuaJIT-tests/lib/ffi/ffi_callback.lua b/test/LuaJIT-tests/lib/ffi/ffi_callback.lua
index 1fd14bd0..253bf1d9 100644
--- a/test/LuaJIT-tests/lib/ffi/ffi_callback.lua
+++ b/test/LuaJIT-tests/lib/ffi/ffi_callback.lua
@@ -6,7 +6,7 @@ void qsort(void *base, size_t nmemb, size_t size,
 	   int (*compar)(const uint8_t *, const uint8_t *));
 ]]
 
-do
+do --- blacklisted callback

first letter should be uppercase and dot is missed in a comment, right?

here and below

   local cb = ffi.cast("int (*)(int, int, int)", function(a, b, c)
     return a+b+c
   end)
@@ -19,7 +19,7 @@ do
   end
 end
 
-do
+do --- cast to function
   assert(ffi.cast("int64_t (*)(int64_t, int64_t, int64_t)", function(a, b, c)
       return a+b+c
     end)(12345678901234567LL, 70000000000000001LL, 10000000909090904LL) ==
@@ -37,11 +37,13 @@ do
       return a+b+c
     end)(7.125, -123.25, 9999.33) == 9883.205078125)
 
-  assert(ffi.cast("int (*)(int, int, int, int, int, int, int, int, int, int)",
-    function(a, b, c, d, e, f, g, h, i, j)
-      return a+b+c+d+e+f+g+h+i+j
-    end)(-42, 17, 12345, 9987, -100, 11, 51, 0x12345678, 338, -78901234) ==
-    -42+17+12345+9987-100+11+51+0x12345678+338-78901234)
+  if not (jit.os == "OSX" and jit.arch == "arm64") then -- NYI
+    assert(ffi.cast("int (*)(int, int, int, int, int, int, int, int, int, int)",
+      function(a, b, c, d, e, f, g, h, i, j)
+        return a+b+c+d+e+f+g+h+i+j
+      end)(-42, 17, 12345, 9987, -100, 11, 51, 0x12345678, 338, -78901234) ==
+      -42+17+12345+9987-100+11+51+0x12345678+338-78901234)

My eyes are bleeding I can't read anymore...

Why you cannot add more whitespaces to expressions?

+  end
 
   assert(ffi.cast("double (*)(double, double, double, double, double, double, double, double, double, double)",
     function(a, b, c, d, e, f, g, h, i, j)
@@ -51,7 +53,7 @@ do
 end
 
 -- Target-specific tests.
-if jit.arch == "x86" then
+do --- cast with fastcall attribute +x86
   assert(ffi.cast("__fastcall int (*)(int, int, int)", function(a, b, c)
       return a+b+c
     end)(10, 99, 13) == 122)
@@ -67,8 +69,7 @@ if jit.arch == "x86" then
     12345678901234567LL+12345+989797123)
 end
 
--- Error handling.
-do
+do --- error handling
   local function f()
     return
   end -- Error for result conversion triggered here.
@@ -84,7 +85,7 @@ do
   assert(pcall(ffi.cast("int (*)(int,int,int,int, int,int,int,int, int)", function() error("test") end), 1,1,1,1, 1,1,1,1, 1) == false)
 end
 
-do
+do --- qsort
   local function cmp(pa, pb)
     local a, b = pa[0], pb[0]
     if a < b then
@@ -102,7 +103,7 @@ do
   for i=0,254 do assert(arr[i] <= arr[i+1]) end
 end
 
-if ffi.abi"win" then
+do --- EnumWindows +windows
   ffi.cdef[[
   typedef int (__stdcall *WNDENUMPROC)(void *hwnd, intptr_t l);
   int EnumWindows(WNDENUMPROC func, intptr_t l);
@@ -123,7 +124,7 @@ if ffi.abi"win" then
   assert(count > 10)
 end
 
-do
+do --- cb.free cb.set
   local cb = ffi.cast("int(*)(void)", function() return 1 end)
   assert(cb() == 1)
   cb:free()
@@ -136,7 +137,7 @@ do
   assert(cb() == 3)
 end
 
-do
+do --- compiled free of function
   local ft = ffi.typeof("void(*)(void)")
   local function f() end
   local t = {}
@@ -146,11 +147,11 @@ do
   end
 end
 
-do
+do --- string.byte
   assert(ffi.cast("int (*)()", function() return string.byte"A" end)() == 65)
 end
 
-do
+do --- debug.traceback debug.sethook
   local f = ffi.cast("void (*)(void)", function() debug.traceback() end)
   debug.sethook(function() debug.sethook(nil, "", 0); f() end, "", 1)
   local x
diff --git a/test/LuaJIT-tests/lib/ffi/index b/test/LuaJIT-tests/lib/ffi/index
index 599a0182..9a22104a 100644
--- a/test/LuaJIT-tests/lib/ffi/index
+++ b/test/LuaJIT-tests/lib/ffi/index
@@ -5,6 +5,7 @@ err.lua
 ffi_arith_ptr.lua
 ffi_bitfield.lua
 ffi_call.lua
+ffi_callback.lua
 istype.lua
 jit_array.lua
 jit_complex.lua