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import gdb
class KstdErrorCodePrinter(gdb.ValuePrinter):
def __init__(self, val):
self.__val = val
def _error_value(self):
return int(self.__val["m_value"])
def _category_name(self):
try:
category_pointer = self.__val["m_category"]
if int(category_pointer) == 0:
return "<null category>"
category = category_pointer.dereference()
try:
dynamic = category.dynamic_type
name = str(dynamic)
except gdb.error:
name = str(category.type)
name = name.replace("(anonymous namespace)::", "")
if name.endswith("_t"):
name = name[:-2]
return name
except (gdb.error, AttributeError):
return "?"
def _message(self):
try:
category_pointer = self.__val["m_category"]
if int(category_pointer) == 0:
return None
value = self._error_value()
address = int(category_pointer)
result = gdb.parse_and_eval(
f"((kstd::error_category const *){address:#x})->message({value})"
)
try:
ptr = result["_M_str"]
length = int(result["_M_len"])
if int(ptr) != 0 and length > 0:
return ptr.string(length=length)
except (gdb.error, AttributeError, KeyError):
pass
return str(result)
except (gdb.error, RuntimeError):
return None
def to_string(self):
value = self._error_value()
category = self._category_name()
msg = self._message()
if msg is not None:
return f"{category}:{value} ({msg})"
return f"{category}:{value}"
def children(self):
yield ("value", self.__val["m_value"])
category_pointer = self.__val["m_category"]
if int(category_pointer) != 0:
yield ("category", category_pointer.dereference())
def display_hint(self):
return None
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