[Tarantool-patches] [PATCH v2 luajit 4/6] lldb: support full-range 64-bit lightuserdata

[Sergey Bronnikov]

Hi, Sergey,

thanks for the patch! LGTM

Sergey

On 5/19/26 15:39, Sergey Kaplun wrote:
> This commit adds the missed support for the full-range 64-bit light
> userdata, which was lost during lldb extension implementation. The
> corresponding entries for the test of lj-tv are sorted according to LJT*
> types.
> ---
>   src/luajit_lldb.py                            | 20 +++++++++++++-
>   .../debug-extension-tests.py                  | 27 ++++++++++++-------
>   2 files changed, 36 insertions(+), 11 deletions(-)
>
> diff --git a/src/luajit_lldb.py b/src/luajit_lldb.py
> index 7668a94c..e3fe82fc 100644
> --- a/src/luajit_lldb.py
> +++ b/src/luajit_lldb.py
> @@ -18,6 +18,12 @@ IRT_P64 = 9
>   LJ_GCVMASK = ((1 << 47) - 1)
>   LJ_TISNUM = None
>   
> +# These constants are meaningful only for 'LJ_64' mode.
> +LJ_LIGHTUD_BITS_SEG = 8
> +LJ_LIGHTUD_BITS_LO = 47 - LJ_LIGHTUD_BITS_SEG
> +LIGHTUD_SEG_MASK = (1 << LJ_LIGHTUD_BITS_SEG) - 1
> +LIGHTUD_LO_MASK = (1 << LJ_LIGHTUD_BITS_LO) - 1
> +
>   # Debugger specific {{{
>   
>   
> @@ -440,6 +446,18 @@ def tvisnumber(o):
>       return itype(o) <= LJ_TISNUM
>   
>   
> +def lightudV(tv):
> +    if LJ_64:
> +        u = int(tv['u64'])
> +        # lightudseg macro expanded.
> +        seg = (u >> LJ_LIGHTUD_BITS_LO) & LIGHTUD_SEG_MASK
> +        segmap = mref('uint32_t *', G(L(None))['gc']['lightudseg'])
> +        # lightudlo macro expanded.
> +        return (int(segmap[seg]) << 32) | (u & LIGHTUD_LO_MASK)
> +    else:
> +        return gcval(tv['gcr'])
> +
> +
>   def dump_lj_tnil(tv):
>       return 'nil'
>   
> @@ -453,7 +471,7 @@ def dump_lj_ttrue(tv):
>   
>   
>   def dump_lj_tlightud(tv):
> -    return 'light userdata @ {}'.format(strx64(gcval(tv['gcr'])))
> +    return 'light userdata @ {}'.format(strx64(lightudV(tv)))
>   
>   
>   def dump_lj_tstr(tv):
> diff --git a/test/tarantool-debugger-tests/debug-extension-tests.py b/test/tarantool-debugger-tests/debug-extension-tests.py
> index f3ce3ced..2b67e151 100644
> --- a/test/tarantool-debugger-tests/debug-extension-tests.py
> +++ b/test/tarantool-debugger-tests/debug-extension-tests.py
> @@ -211,23 +211,28 @@ class TestLJTV(TestCaseBase):
>           'lj-tv L->base + 9\n'
>           'lj-tv L->base + 10\n'
>           'lj-tv L->base + 11\n'
> +        'lj-tv L->base + 12\n'
> +        'lj-tv L->base + 13\n'
>       )
>   
> +    # Sorted in LJT order.
>       lua_script = (
>           'local ffi = require("ffi")\n'
>           'print(\n'
>           '  nil,\n'
>           '  false,\n'
>           '  true,\n'
> +        '  debug.upvalueid(print, 1), \n'  # lightuserdata
>           '  "hello",\n'
> -        '  {1},\n'
> -        '  1,\n'
> -        '  1.1,\n'
>           '  coroutine.create(function() end),\n'
> -        '  ffi.new("int*"),\n'
>           '  function() end,\n'
> +        '  require,\n'
>           '  print,\n'
> -        '  require\n'
> +        '  ffi.new("int*"),\n'
> +        '  {1},\n'
> +        '  newproxy(),\n'
> +        '  1,\n'
> +        '  1.1\n'
>           ')\n'
>       )
>   
> @@ -235,15 +240,17 @@ class TestLJTV(TestCaseBase):
>           r'nil\n'
>           r'false\n'
>           r'true\n'
> +        r'light userdata @ ' + RX_ADDR + r'\n'
>           r'string \"hello\" @ ' + RX_ADDR + r'\n'
> -        r'table @ ' + RX_ADDR + r' \(asize: \d+, hmask: ' + RX_HASH + r'\)\n'
> -        r'(number|integer) .*1.*\n'
> -        r'number 1.1\d+\n'
>           r'thread @ ' + RX_ADDR + r'\n'
> -        r'cdata @ ' + RX_ADDR + r'\n'
>           r'Lua function @ ' + RX_ADDR + r', [0-9]+ upvalues, .+:[0-9]+\n'
> -        r'fast function #[0-9]+\n'
>           r'C function @ ' + RX_ADDR + r'\n'
> +        r'fast function #[0-9]+\n'
> +        r'cdata @ ' + RX_ADDR + r'\n'
> +        r'table @ ' + RX_ADDR + r' \(asize: \d+, hmask: ' + RX_HASH + r'\)\n'
> +        r'userdata @ ' + RX_ADDR + r'\n'
> +        r'(number|integer) .*1.*\n'
> +        r'number 1.1\d+\n'
>       )
>   
>   
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