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gdb: add custom cmd for printing linked list

areaIntegration
Mathieu Maret 2 months ago
parent
commit
220597a881
  1. 86
      custom_gdb_extension.py

86
custom_gdb_extension.py

@ -136,6 +136,92 @@ class PhyMemDescListDumpCmd(gdb.Command):
print(self._phy_memDesc_lit_to_str(desc))
class PrintStructC99Cmd(gdb.Command):
def __init__(self):
super(PrintStructC99Cmd, self).__init__(
"print_struct_c99",
gdb.COMMAND_USER,
)
def complete(self, text, word):
return gdb.COMPLETE_SYMBOL
def get_count_heading(self, string):
for i, s in enumerate(string):
if s != ' ':
break
return i
def extract_typename(self, string):
first_line = string.split('\n')[0]
return first_line.split('=')[1][:-1].strip()
def invoke(self, arg, from_tty):
gdb.execute("set print pretty")
gdb.execute('set pagination off')
gdb.execute('set print repeats 0')
gdb.execute('set print elements unlimited')
ret_ptype = gdb.execute('ptype {}'.format(arg), to_string=True)
tname = self.extract_typename(ret_ptype)
print('{} {} = {{'.format(tname, arg))
r = gdb.execute('p {}'.format(arg), to_string=True)
r = r.split('\n')
for rr in r[1:]:
if '=' not in rr:
print(rr)
continue
hs = self.get_count_heading(rr)
rr_s = rr.strip().split('=', 1)
rr_rval = rr_s[1].strip()
print(' ' * hs + '.' + rr_s[0] + '= ' + rr_rval)
class ListDumpCmd(gdb.Command):
"""Prints a linked list"""
def __init__(self):
super(ListDumpCmd, self).__init__(
"list_dump", gdb.COMMAND_USER
)
def _print_list(self, val):
"""Walk through the linked list.
We will simply follow the 'next' pointers until we encounter the HEAD again
"""
idx = 0
head = val
kthread_ptr = val
result = ""
while kthread_ptr != 0 and (idx == 0 or kthread_ptr != head):
result += gdb.execute('p *({}){}'.format(str(kthread_ptr.type),kthread_ptr), to_string=True)
kthread_ptr = kthread_ptr["next"]
idx += 1
result = ("Found a Linked List with %d items:" % idx) + "\n"+ result
return result
def complete(self, text, word):
# We expect the argument passed to be a symbol so fallback to the
# internal tab-completion handler for symbols
return gdb.COMPLETE_SYMBOL
def invoke(self, args, from_tty):
# We can pass args here and use Python CLI utilities like argparse
# to do argument parsing
print("Args Passed: %s" % args)
if args:
ptr_val = gdb.parse_and_eval(args)
else:
ptr_val = gdb.parse_and_eval("currentThread")
try:
ptr_val["next"]
except:
print("Expected pointer argument with a next field")
return
print(self._print_list(ptr_val))
register_pretty_printer(None, CustomPrettyPrinterLocator(), replace=True)
KthreadListDumpCmd()
PhyMemDescListDumpCmd()
PrintStructC99Cmd()
ListDumpCmd()
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