[Tarantool-patches] [PATCH v2 luajit 2/3] gdb: adjust the extension to be used with Python 2

[Igor Munkin <imun@tarantool.org>]

This patch covers all problems faced while using the extension via gdb
compiled with Python 2.

Signed-off-by: Igor Munkin <imun@tarantool.org>
---
 src/luajit-gdb.py | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/luajit-gdb.py b/src/luajit-gdb.py
index 77da5e6..90df101 100644
--- a/src/luajit-gdb.py
+++ b/src/luajit-gdb.py
@@ -1,5 +1,14 @@
 import re
 import gdb
+import sys
+
+# make script compatible with the ancient Python {{{
+
+if re.match(r'^2\.', sys.version):
+    int = long
+    range = xrange
+
+# }}}
 
 gtype_cache = {}
 
@@ -47,7 +56,8 @@ def i2notu32(val):
     return ~int(val) & 0xFFFFFFFF
 
 def strx64(val):
-    return hex(cast('uint64_t', val) & 0xFFFFFFFFFFFFFFFF)
+    return re.sub('L?$', '',
+                  hex(int(cast('uint64_t', val) & 0xFFFFFFFFFFFFFFFF)))
 
 # Types {{{
 
@@ -169,7 +179,9 @@ def gcval(obj):
 
 def L(L=None):
     # lookup a symbol for the main coroutine considering the host app
-    for l in (L, *map(lambda l: lookup(l), (
+    # XXX Fragile: though the loop initialization looks like a crap but it
+    # respects both Python 2 and Python 3.
+    for l in [ L ] + list(map(lambda l: lookup(l), (
         # LuaJIT main coro (see luajit/src/luajit.c)
         'globalL',
         # Tarantool main coro (see tarantool/src/lua/init.h)
@@ -234,7 +246,10 @@ def tvislightud(o):
 
 def strdata(obj):
     # String is printed with pointer to it, thanks to gdb. Just strip it.
-    return str(cast('char *', cast('GCstr *', obj) + 1))[len(PADDING):]
+    try:
+        return str(cast('char *', cast('GCstr *', obj) + 1))[len(PADDING):]
+    except UnicodeEncodeError:
+        return "<luajit-gdb: error occured while rendering non-ascii slot>"
 
 def itypemap(o):
     if LJ_64 and not LJ_GC64:
-- 
2.24.0