From: Sergey Bronnikov via Tarantool-patches <tarantool-patches@dev.tarantool.org> To: Sergey Kaplun <skaplun@tarantool.org>, Maxim Kokryashkin <m.kokryashkin@tarantool.org> Cc: tarantool-patches@dev.tarantool.org Subject: Re: [Tarantool-patches] [PATCH luajit] Add missing coercion when recording select(string, ...) Date: Tue, 24 Sep 2024 13:28:38 +0300 [thread overview] Message-ID: <d50a0254-d8d9-4544-b99e-b3cc46e3942a@tarantool.org> (raw) In-Reply-To: <20240923112852.26851-1-skaplun@tarantool.org> [-- Attachment #1: Type: text/plain, Size: 3677 bytes --] Hi, Sergey, thanks for the patch! See minor comment below. LGTM On 23.09.2024 14:28, Sergey Kaplun wrote: > From: Mike Pall <mike> > > Thanks to Peter Cawley. > > (cherry picked from commit 92b89d005ab721a61bce6d471b052bcb236b81d7) > > Before the patch, the recording of `select()` with a string argument > leads to the following IR: > | rcx > int CONV "1" int.num index > Where the operand has string type instead of number type. > This leads to the corresponding mcode: > | cvttsd2si ecx, xmm1 > Where xmm1 has an undefined value. Thus leads to the undefined behaviour > for the recording trace. > > This patch adds the missing coercion. > > Sergey Kaplun: > * added the description and the test for the problem > > Part of tarantool/tarantool#10199 > --- > > Branch:https://github.com/tarantool/luajit/tree/skaplun/lj-1083-missing-tostring-coercion-in-select > Related issues: > *https://github.com/tarantool/tarantool/issues/10199 > *https://github.com/LuaJIT/LuaJIT/issues/1083 > > src/lj_record.c | 5 ++- > ...ssing-tostring-coercion-in-select.test.lua | 39 +++++++++++++++++++ > 2 files changed, 43 insertions(+), 1 deletion(-) > create mode 100644 test/tarantool-tests/lj-1083-missing-tostring-coercion-in-select.test.lua > > diff --git a/src/lj_record.c b/src/lj_record.c > index 96fe26d8..311d9fe7 100644 > --- a/src/lj_record.c > +++ b/src/lj_record.c > @@ -1871,8 +1871,11 @@ static void rec_varg(jit_State *J, BCReg dst, ptrdiff_t nresults) > TRef tr = TREF_NIL; > ptrdiff_t idx = lj_ffrecord_select_mode(J, tridx, &J->L->base[dst-1]); > if (idx < 0) goto nyivarg; > - if (idx != 0 && !tref_isinteger(tridx)) > + if (idx != 0 && !tref_isinteger(tridx)) { > + if (tref_isstr(tridx)) > + tridx = emitir(IRTG(IR_STRTO, IRT_NUM), tridx, 0); > tridx = emitir(IRTGI(IR_CONV), tridx, IRCONV_INT_NUM|IRCONV_INDEX); > + } > if (idx != 0 && tref_isk(tridx)) { > emitir(IRTGI(idx <= nvararg ? IR_GE : IR_LT), > fr, lj_ir_kint(J, frofs+8*(int32_t)idx)); > diff --git a/test/tarantool-tests/lj-1083-missing-tostring-coercion-in-select.test.lua b/test/tarantool-tests/lj-1083-missing-tostring-coercion-in-select.test.lua > new file mode 100644 > index 00000000..8089247f > --- /dev/null > +++ b/test/tarantool-tests/lj-1083-missing-tostring-coercion-in-select.test.lua > @@ -0,0 +1,39 @@ > +local tap = require('tap') > + > +-- Test file to demonstrate LuaJIT incorrect recording of > +-- `select()` fast function. > +-- See also:https://github.com/LuaJIT/LuaJIT/issues/1083. > + > +local test = tap.test('lj-1083-missing-tostring-coercion-in-select'):skipcond({ > + ['Test requires JIT enabled'] = not jit.status(), > +}) > + > +test:plan(1) > + > +-- Simplify the `jit.dump()` output. > +local select = select > + > +local function test_select(...) > + local result > + for _ = 1, 4 do > + -- Before the patch, with the missed coercion to string, the > + -- recording of `select()` below leads to the following IR: > + -- | rcx > int CONV "1" int.num index > + -- Where the operand has string type instead of number type. > + -- This leads to the corresponding mcode: > + -- | cvttsd2si ecx, xmm1 > + -- Where xmm1 has an undefined value. Thus leads to the > + -- incorrect result for the call below. > + result = select('1', ...) > + end > + return result > +end > + > +jit.opt.start('hotloop=1') > + > +-- XXX: amount of arguments is empirical, see the comment above. > +local result = test_select(1, 2, 3, 4) > + > +test:is(result, 1, 'corect select result after recording') s/corect/correct/ > + > +test:done(true) [-- Attachment #2: Type: text/html, Size: 4803 bytes --]
next prev parent reply other threads:[~2024-09-24 10:28 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-09-23 11:28 Sergey Kaplun via Tarantool-patches 2024-09-24 10:28 ` Sergey Bronnikov via Tarantool-patches [this message] 2024-09-24 10:33 ` Sergey Kaplun via Tarantool-patches 2024-10-11 19:04 ` Maxim Kokryashkin via Tarantool-patches 2024-10-18 15:17 ` Sergey Kaplun via Tarantool-patches
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