mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-03-14 19:13:02 -05:00
10a4f1156c
I've been playing around with GDB's Python scripting system recently, and this is a thing I've always thought it would be nice to be able to do: if you load this script (which, on Ubuntu 18.04's gdb, is as simple as 'source contrib/gdb.py' at the gdb prompt, or similar), then variables of type Bignum will be printed as (e.g.) 'Bignum(0x12345)', or 'Bignum(NULL)' if they're null pointers, or a fallback representation if they're non-null pointers but gdb can't read anything sensible from them.
38 lines
1.2 KiB
Python
38 lines
1.2 KiB
Python
import gdb
|
|
import re
|
|
import gdb.printing
|
|
|
|
class PuTTYBignumPrettyPrinter(gdb.printing.PrettyPrinter):
|
|
"Pretty-print PuTTY's Bignum type."
|
|
name = "Bignum"
|
|
|
|
def __init__(self, val):
|
|
super(PuTTYBignumPrettyPrinter, self).__init__(self.name)
|
|
self.val = val
|
|
|
|
def to_string(self):
|
|
type_BignumInt = gdb.lookup_type("BignumInt")
|
|
type_BignumIntPtr = type_BignumInt.pointer()
|
|
BIGNUM_INT_BITS = 8 * type_BignumInt.sizeof
|
|
array = self.val.cast(type_BignumIntPtr)
|
|
aget = lambda i: int(array[i]) & ((1 << BIGNUM_INT_BITS)-1)
|
|
|
|
try:
|
|
length = aget(0)
|
|
value = 0
|
|
for i in range(length):
|
|
value |= aget(i+1) << (BIGNUM_INT_BITS * i)
|
|
return "Bignum({:#x})".format(value)
|
|
|
|
except gdb.MemoryError:
|
|
address = int(array)
|
|
if address == 0:
|
|
return "Bignum(NULL)".format(address)
|
|
return "Bignum(invalid @ {:#x})".format(address)
|
|
|
|
rcpp = gdb.printing.RegexpCollectionPrettyPrinter("PuTTY")
|
|
rcpp.add_printer(PuTTYBignumPrettyPrinter.name, "^Bignum$",
|
|
PuTTYBignumPrettyPrinter)
|
|
|
|
gdb.printing.register_pretty_printer(None, rcpp)
|