[Tarantool-patches] [PATCH luajit 3/4] FFI: Allow ffi.metatype() for typedefs with attributes.
Sergey Kaplun
skaplun at tarantool.org
Mon Jun 3 17:34:01 MSK 2024
From: Mike Pall <mike>
Reported by Eric Gouyer.
(cherry picked from commit 27a6fee82e91319bbed8c3aa443aa2b0f1b0a470)
Before the patch, `ffi.metatype()` raises an error when calling it on
ctype with attributes. This patch fixes the behaviour by using
`ctype_raw()` instead of `ctype_get()` to follow child ctypes unless
there are no attributes on the ctype.
Sergey Kaplun:
* added the description and the test for the problem
Part of tarantool/tarantool#9924
---
src/lib_ffi.c | 2 +-
test/tarantool-tests/lj-861-ctype-attributes.test.lua | 10 +++++++---
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index 2bfca25a..dfb01658 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -770,7 +770,7 @@ LJLIB_CF(ffi_metatype)
CTypeID id = ffi_checkctype(L, cts, NULL);
GCtab *mt = lj_lib_checktab(L, 2);
GCtab *t = cts->miscmap;
- CType *ct = ctype_get(cts, id); /* Only allow raw types. */
+ CType *ct = ctype_raw(cts, id);
TValue *tv;
GCcdata *cd;
if (!(ctype_isstruct(ct->info) || ctype_iscomplex(ct->info) ||
diff --git a/test/tarantool-tests/lj-861-ctype-attributes.test.lua b/test/tarantool-tests/lj-861-ctype-attributes.test.lua
index e8b29d67..a407fae0 100644
--- a/test/tarantool-tests/lj-861-ctype-attributes.test.lua
+++ b/test/tarantool-tests/lj-861-ctype-attributes.test.lua
@@ -7,14 +7,14 @@ local tap = require('tap')
local test = tap.test('lj-861-ctype-attributes')
local ffi = require('ffi')
-test:plan(4)
+test:plan(5)
local EXPECTED_ALIGN = 4
ffi.cdef([[
-struct __attribute__((aligned($))) s_aligned {
+typedef struct __attribute__((aligned($))) s_aligned {
uint8_t a;
-};
+} s_aligned;
struct test_parsing_sizeof {
char a[sizeof(struct s_aligned &)];
@@ -37,4 +37,8 @@ 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', {})
+
+test:ok(ok, 'ffi.metatype is called at the structure with attributes')
+
test:done(true)
--
2.45.1
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