[Tarantool-patches] [PATCH luajit] x64/LJ_GC64: Fix type-check-only variant of SLOAD.
sergos
sergos at tarantool.org
Thu Dec 15 18:49:47 MSK 2022
Hi!
Thanks for the patch!
LGTM with fixes after Max’s review.
Although, as we discussed earlier I would prefer the test has
`skipcond(not ffi.abi('gc64’), 'test is GC64 only')`
regards,
Sergos
> On 6 Dec 2022, at 11:49, Sergey Kaplun <skaplun at tarantool.org> wrote:
>
> Hi, Maxim!
>
> Thanks for the review!
>
> Fixed you comments.
>
> On 06.12.22, Maxim Kokryashkin wrote:
>>
>> Hi, Sergey!
>> Thanks for the patch!
>> Please consider my comments below.
>>>
>
> <snipped>
>
>>>> ---
>>>>
>>>> Branch: https://github.com/tarantool/luajit/tree/skaplun/lj-350-fix-sload-typecheck-full-ci
>>>> Issues:
>>>> * https://github.com/tarantool/tarantool/issues/7230
>>>> * https://github.com/LuaJIT/LuaJIT/pull/350
>>>> Tarantool PR: https://github.com/tarantool/tarantool/pull/7995
>>>>
>>>> src/lj_asm_x86.h | 2 +-
>>>> .../lj-350-sload-typecheck.test.lua | 42 +++++++++++++++++++
>>>> .../lj-408-tonumber-cdata-record.test.lua | 10 -----
>>>> 3 files changed, 43 insertions(+), 11 deletions(-)
>>>> create mode 100644 test/tarantool-tests/lj-350-sload-typecheck.test.lua
>>>>
>>>> diff --git a/src/lj_asm_x86.h b/src/lj_asm_x86.h
>>>> index 8a4d4025..8efda8e5 100644
>>>> --- a/src/lj_asm_x86.h
>>>> +++ b/src/lj_asm_x86.h
>
> <snipped>
>
>>>> diff --git a/test/tarantool-tests/lj-350-sload-typecheck.test.lua b/test/tarantool-tests/lj-350-sload-typecheck.test.lua
>>>> new file mode 100644
>>>> index 00000000..6ffc61fb
>>>> --- /dev/null
>>>> +++ b/test/tarantool-tests/lj-350-sload-typecheck.test.lua
>>>> @@ -0,0 +1,42 @@
>>>> +local tap = require('tap')
>>>> +local traceinfo = require('jit.util').traceinfo
>>>> +
>>>> +-- Test file to demonstrate the incorrect GC64 JIT asembling
>>>> +-- `IR_SLOAD`.
>>>> +-- See also https://github.com/LuaJIT/LuaJIT/pull/350 .
>>>> +local test = tap.test('lj-350-sload-typecheck')
>>>> +
>>>> +test:plan(1)
>>>> +
>>>> +-- Contains only IR_SLOAD after recording.
>>>> +local function sload(arg)
>>>> + return arg
>>>> +end
>>>> +
>>>> +local tab_arg = {}
>>>> +
>>>> +-- Reset JIT, remove any other traces.
>>>> +jit.off()
>>>> +jit.flush()
>>>> +
>>>> +assert(not traceinfo(1), 'no traces compiled after flush')
>>>> +
>>>> +-- Try to executed compiled trace wiht IR_SLOAD, if emitted mcode
>>> Typo: s/to executed/to execute
>>> Typo: s/wiht/with
>>> Typo: s/if emitted/if the emmited
>
> Fixed.
>
>>>> +-- is incorrect, assertion guard type check will failed even for
>>> Typo: s/failed/fail
>>> Typo: s/for/ for the
>
> Fixed.
>
> See the iterative patch below:
>
> ===================================================================
> diff --git a/test/tarantool-tests/lj-350-sload-typecheck.test.lua b/test/tarantool-tests/lj-350-sload-typecheck.test.lua
> index 6ffc61fb..33794943 100644
> --- a/test/tarantool-tests/lj-350-sload-typecheck.test.lua
> +++ b/test/tarantool-tests/lj-350-sload-typecheck.test.lua
> @@ -21,9 +21,9 @@ jit.flush()
>
> assert(not traceinfo(1), 'no traces compiled after flush')
>
> --- Try to executed compiled trace wiht IR_SLOAD, if emitted mcode
> --- is incorrect, assertion guard type check will failed even for
> --- correct type of argument and a new trace is recorded.
> +-- Try to execute the compiled trace with IR_SLOAD, if the emitted
> +-- mcode is incorrect, assertion guard type check will fail even
> +-- for the correct type of argument and a new trace is recorded.
> jit.opt.start('hotloop=1', 'hotexit=1')
>
> jit.on()
> ===================================================================
>
> Branch is force-pushed.
>
>>>> +-- correct type of argument and a new trace is recorded.
>>>> +jit.opt.start('hotloop=1', 'hotexit=1')
>>>> +
>>>> +jit.on()
>>>> +
>>>> +-- Make the function hot.
>>>> +sload(tab_arg)
>>>> +-- Compile the trace.
>>>> +sload(tab_arg)
>>>> +-- Execute trace and try to compile a trace from the side exit.
>>>> +sload(tab_arg)
>>>> +
>>>> +jit.off()
>>>> +
>>>> +test:ok(not traceinfo(2), 'the second trace should not be compiled')
>>>> +
>>>> +os.exit(test:check() and 0 or 1)
>>> Also, that test passes even without the patch on Linux x86_64 GC64: OFF
>
> Yes, because patch fixes the behaviour only for GC64 as mentioned in the
> commit message.
>
>>>> diff --git a/test/tarantool-tests/lj-408-tonumber-cdata-record.test.lua b/test/tarantool-tests/lj-408-tonumber-cdata-record.test.lua
>>>> index bf9e8e46..a8235e93 100644
>>>> --- a/test/tarantool-tests/lj-408-tonumber-cdata-record.test.lua
>>>> +++ b/test/tarantool-tests/lj-408-tonumber-cdata-record.test.lua
>
> <snipped>
>
>>>> 2.34.1
>>> --
>>> Best regards,
>>> Maxim Kokryashkin
>
> --
> Best regards,
> Sergey Kaplun
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