[Tarantool-patches] [PATCH luajit v2] luajit-gdb: support dualnum mode

[Максим Корякшин]

While I was working on another luajit-gdb enhancement,
I noticed that I forgot to add LJ_DUALNUM and LJ_TISNUM
declarations. So here is the diff that fixes it:
===========================================
diff --git a/src/luajit-gdb.py b/src/luajit-gdb.py
index d4882dd7..b656a808 100644
--- a/src/luajit-gdb.py
+++ b/src/luajit-gdb.py
@@ -157,9 +157,10 @@ def frame_prev(framelink):
 LJ_64 = None
 LJ_GC64 = None
 LJ_FR2 = None
+LJ_DUALNUM = None
 LJ_GCVMASK = ((1 << 47) - 1)
-
+LJ_TISNUM = None
 PADDING = None
 # }}}
===========================================
  
>Суббота, 14 августа 2021, 14:39 +03:00 от Maxim Kokryashkin <max.kokryashkin at gmail.com>:
> 
>luajit-gdb.py displays integers in LJ_DUALNUM mode as nan-s. The
>dumper function produces output thinking of any input value as of a
>double. However, in DUALNUM mode, integers and doubles are stored
>differently, so the `itype` of a float number must be less than
>`LJ_TISNUM`, and the `itype` of an integer must be `LJ_TISNUM`. With
>this fact in mind, we can easily differentiate one from another.
>
>Closes tarantool/tarantool#6224
>---
>Changes in v2:
>  - Fixed comments as per review by Sergey
>
> src/luajit-gdb.py | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
>diff --git a/src/luajit-gdb.py b/src/luajit-gdb.py
>index c50405ad..d4882dd7 100644
>--- a/src/luajit-gdb.py
>+++ b/src/luajit-gdb.py
>@@ -238,8 +238,11 @@ def jit_state(g):
>         0x15: 'ERR',
>     }.get(int(J(g)['state']), 'INVALID')
> 
>+def tvisint(o):
>+ return LJ_DUALNUM and itype(o) == LJ_TISNUM
>+
> def tvisnumber(o):
>- return itype(o) <= (0xfffeffff if LJ_64 and not LJ_GC64 else LJ_T['NUMX'])
>+ return itype(o) <= LJ_TISNUM
> 
> def tvislightud(o):
>     if LJ_64 and not LJ_GC64:
>@@ -343,7 +346,10 @@ def dump_lj_tudata(tv):
>     return 'userdata @ {}'.format(strx64(gcval(tv['gcr'])))
> 
> def dump_lj_tnumx(tv):
>- return 'number {}'.format(cast('double', tv['n']))
>+ if tvisint(tv):
>+ return 'number {}'.format(cast('int32_t', tv['i']))
>+ else:
>+ return 'number {}'.format(cast('double', tv['n']))
> 
> def dump_lj_invalid(tv):
>     return 'not valid type @ {}'.format(strx64(gcval(tv['gcr'])))
>@@ -683,7 +689,7 @@ The command requires no args and dumps current GC stats:
>         ))
> 
> def init(commands):
>- global LJ_64, LJ_GC64, LJ_FR2, PADDING
>+ global LJ_64, LJ_GC64, LJ_DUALNUM, LJ_TISNUM, LJ_FR2, PADDING
> 
>     # XXX Fragile: though connecting the callback looks like a crap but it
>     # respects both Python 2 and Python 3 (see #4828).
>@@ -724,6 +730,7 @@ def init(commands):
>     try:
>         LJ_64 = str(gdb.parse_and_eval('IRT_PTR')) == 'IRT_P64'
>         LJ_FR2 = LJ_GC64 = str(gdb.parse_and_eval('IRT_PGC')) == 'IRT_P64'
>+ LJ_DUALNUM = lookup('lj_lib_checknumber') is not None
>     except:
>         gdb.write('luajit-gdb.py failed to load: '
>                   'no debugging symbols found for libluajit\n')
>@@ -733,6 +740,7 @@ def init(commands):
>         command(name)
> 
>     PADDING = ' ' * len(':' + hex((1 << (47 if LJ_GC64 else 32)) - 1))
>+ LJ_TISNUM = 0xfffeffff if LJ_64 and not LJ_GC64 else LJ_T['NUMX']
> 
>     gdb.write('luajit-gdb.py is successfully loaded\n')
> 
>--
>2.32.0
 
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