Add gdb pretty-printing script

scylla-gdb.py

@@ -0,0 +1,22 @@
+import gdb, gdb.printing
+
+class sstring_printer(gdb.printing.PrettyPrinter):
+    'print an sstring'
+    def __init__(self, val):
+        self.val = val
+    def to_string(self):
+        if self.val['u']['internal']['size'] >= 0:
+            array = self.val['u']['internal']['str']
+            len = self.val['u']['internal']['size']
+            return ''.join([chr(array[x]) for x in range(len)])
+        else:
+            return self.val['u']['external']['str']
+    def display_hint(self):
+        return 'string'
+
+def build_pretty_printer():
+    pp = gdb.printing.RegexpCollectionPrettyPrinter('scylla')
+    pp.add_printer('sstring', r'^basic_sstring<char,.*>$', sstring_printer)
+    return pp
+
+gdb.printing.register_pretty_printer(gdb.current_objfile(), build_pretty_printer())