[Tarantool-patches] [PATCH luajit] x64/LJ_GC64: Fix type-check-only variant of SLOAD.

[Maxim Kokryashkin]

Hi!
Thanks for the fixes!
LGTM
--
Best regards,
Maxim Kokryashkin
 
  
>Вторник, 6 декабря 2022, 11:52 +03:00 от Sergey Kaplun <skaplun at tarantool.org>:
> 
>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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