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contrib/gdb.py: add a pretty-printer for ptrlen.

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I mostly really like the use of 'ptrlen' in place of zero-terminated
strings in PuTTY, but one place it's awkward is when debuggging
through string-handling code, because gdb won't automatically show me
exactly what a ptrlen points to. Now it does.
This commit is contained in:
Simon Tatham 2022-05-02 11:05:54 +01:00
parent 8d2c643fcb
commit 619bb441ec
1 changed files with 17 additions and 0 deletions
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17
contrib/gdb.py
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@ -30,12 +30,29 @@ class PuTTYMpintPrettyPrinter(gdb.printing.PrettyPrinter):
return "mp_int(NULL)".format(address) return "mp_int(NULL)".format(address)
return "mp_int(invalid @ {:#x})".format(address) return "mp_int(invalid @ {:#x})".format(address)
class PuTTYPtrlenPrettyPrinter(gdb.printing.PrettyPrinter):
"Pretty-print strings in PuTTY's ptrlen type."
name = "ptrlen"
def __init__(self, val):
super(PuTTYPtrlenPrettyPrinter, self).__init__(self.name)
self.val = val
def to_string(self):
length = int(self.val["len"])
char_array_ptr_type = gdb.lookup_type(
"char").const().array(length).pointer()
line = self.val["ptr"].cast(char_array_ptr_type).dereference()
return repr(bytes(int(line[i]) for i in range(length))).lstrip('b')
class PuTTYPrinterSelector(gdb.printing.PrettyPrinter): class PuTTYPrinterSelector(gdb.printing.PrettyPrinter):
def __init__(self): def __init__(self):
super(PuTTYPrinterSelector, self).__init__("PuTTY") super(PuTTYPrinterSelector, self).__init__("PuTTY")
def __call__(self, val): def __call__(self, val):
if str(val.type) == "mp_int *": if str(val.type) == "mp_int *":
return PuTTYMpintPrettyPrinter(val) return PuTTYMpintPrettyPrinter(val)
if str(val.type) == "ptrlen":
return PuTTYPtrlenPrettyPrinter(val)
return None return None
gdb.printing.register_pretty_printer(None, PuTTYPrinterSelector()) gdb.printing.register_pretty_printer(None, PuTTYPrinterSelector())