ladybird/Meta/serenity_gdb.py

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# Copyright (c) 2021, Gunnar Beutner <gunnar@beutner.name>
#
# SPDX-License-Identifier: BSD-2-Clause
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import gdb
import gdb.types
import re
def handler_class_for_type(type, re=re.compile('^([^<]+)(<.*>)?$')):
typename = str(type.tag)
match = re.match(typename)
if not match:
return None
klass = match.group(1)
if klass == 'AK::Atomic':
return AKAtomic
elif klass == 'AK::DistinctNumeric':
return AKDistinctNumeric
elif klass == 'AK::HashMap':
return AKHashMapPrettyPrinter
elif klass == 'AK::RefCounted':
return AKRefCounted
elif klass == 'AK::RefPtr':
return AKRefPtr
elif klass == 'AK::OwnPtr':
return AKOwnPtr
elif klass == 'AK::NonnullRefPtr':
return AKRefPtr
elif klass == 'AK::SinglyLinkedList':
return AKSinglyLinkedList
elif klass == 'AK::String':
return AKString
elif klass == 'AK::StringView':
return AKStringView
elif klass == 'AK::StringImpl':
return AKStringImpl
elif klass == 'AK::Variant':
return AKVariant
elif klass == 'AK::Vector':
return AKVector
elif klass == 'VirtualAddress':
return VirtualAddress
else:
return UnhandledType
class UnhandledType:
@classmethod
def prettyprint_type(cls, type):
return type.name
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class AKAtomic:
def __init__(self, val):
self.val = val
def to_string(self):
return self.val["m_value"]
@classmethod
def prettyprint_type(cls, type):
contained_type = type.template_argument(0)
return f'AK::Atomic<{handler_class_for_type(contained_type).prettyprint_type(contained_type)}>'
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class AKDistinctNumeric:
def __init__(self, val):
self.val = val
def to_string(self):
return self.val["m_value"]
@classmethod
def prettyprint_type(cls, type):
actual_name = type.template_argument(1)
parts = actual_name.name.split("::")
unqualified_name = re.sub(r'__(\w+)_tag', r'\1', actual_name.name)
if unqualified_name != actual_name.name:
qualified_name = '::'.join(parts[:-2] + [unqualified_name])
return qualified_name
# If the tag is malformed, just print DistinctNumeric<T>
contained_type = type.template_argument(0)
return f'AK::DistinctNumeric<{handler_class_for_type(contained_type).prettyprint_type(contained_type)}>'
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class AKRefCounted:
def __init__(self, val):
self.val = val
def to_string(self):
return self.val["m_ref_count"]
@classmethod
def prettyprint_type(cls, type):
contained_type = type.template_argument(0)
return f'AK::RefCounted<{handler_class_for_type(contained_type).prettyprint_type(contained_type)}>'
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class AKString:
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val["m_impl"]["m_bits"]["m_value"]) == 0:
return '""'
else:
impl = AKRefPtr(self.val["m_impl"]).get_pointee().dereference()
return AKStringImpl(impl).to_string()
@classmethod
def prettyprint_type(cls, type):
return 'AK::String'
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class AKStringView:
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val["m_length"]) == 0:
return '""'
else:
characters = self.val["m_characters"]
str_type = characters.type.target().array(self.val["m_length"]).pointer()
return str(characters.cast(str_type).dereference())
@classmethod
def prettyprint_type(cls, type):
return 'AK::StringView'
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def get_field_unalloced(val, member, type):
# Trying to access a variable-length field seems to fail with
# Python Exception <class 'gdb.error'> value requires 4294967296 bytes, which is more than max-value-size
# This works around that issue.
return gdb.parse_and_eval(f"*({type}*)(({val.type.name}*){int(val.address)})->{member}")
class AKStringImpl:
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val["m_length"]) == 0:
return '""'
else:
str_type = gdb.lookup_type("char").array(self.val["m_length"])
return get_field_unalloced(self.val, "m_inline_buffer", str_type)
@classmethod
def prettyprint_type(cls, type):
return 'AK::StringImpl'
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class AKOwnPtr:
def __init__(self, val):
self.val = val
def to_string(self):
return AKOwnPtr.prettyprint_type(self.val.type)
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def children(self):
return [('*', self.val["m_ptr"])]
@classmethod
def prettyprint_type(cls, type):
contained_type = type.template_argument(0)
return f'AK::OwnPtr<{handler_class_for_type(contained_type).prettyprint_type(contained_type)}>'
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class AKRefPtr:
def __init__(self, val):
self.val = val
def to_string(self):
return AKRefPtr.prettyprint_type(self.val.type)
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def get_pointee(self):
inner_type = self.val.type.template_argument(0)
inner_type_ptr = inner_type.pointer()
return self.val["m_bits"]["m_value"].cast(inner_type_ptr)
def children(self):
return [('*', self.get_pointee())]
@classmethod
def prettyprint_type(cls, type):
contained_type = type.template_argument(0)
return f'AK::RefPtr<{handler_class_for_type(contained_type).prettyprint_type(contained_type)}>'
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class AKVariant:
def __init__(self, val):
self.val = val
self.index = int(self.val["m_index"])
self.contained_types = self.resolve_types(self.val.type)
def to_string(self):
return AKVariant.prettyprint_type(self.val.type)
def children(self):
data = self.val["m_data"]
ty = self.contained_types[self.index]
return [(ty.name, data.cast(ty.pointer()).referenced_value())]
@classmethod
def resolve_types(cls, ty):
contained_types = []
type_resolved = ty.strip_typedefs()
index = 0
while True:
try:
arg = type_resolved.template_argument(index)
index += 1
contained_types.append(arg)
except RuntimeError:
break
return contained_types
@classmethod
def prettyprint_type(cls, ty):
names = ", ".join(handler_class_for_type(t).prettyprint_type(t) for t in AKVariant.resolve_types(ty))
return f'AK::Variant<{names}>'
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class AKVector:
def __init__(self, val):
self.val = val
def to_string(self):
return f'{AKVector.prettyprint_type(self.val.type)} of len {int(self.val["m_size"])}'
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def children(self):
vec_len = int(self.val["m_size"])
if vec_len == 0:
return []
outline_buf = self.val["m_outline_buffer"]
inner_type_ptr = self.val.type.template_argument(0).pointer()
if int(outline_buf) != 0:
elements = outline_buf.cast(inner_type_ptr)
else:
elements = get_field_unalloced(self.val, "m_inline_buffer_storage", inner_type_ptr)
return [(f"[{i}]", elements[i]) for i in range(vec_len)]
@classmethod
def prettyprint_type(cls, type):
template_type = type.template_argument(0)
return f'AK::Vector<{handler_class_for_type(template_type).prettyprint_type(template_type)}>'
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class AKHashMapPrettyPrinter:
def __init__(self, val):
self.val = val
@staticmethod
def _iter_hashtable(val, cb):
entry_type_ptr = val.type.template_argument(0).pointer()
buckets = val["m_buckets"]
for i in range(0, val["m_capacity"]):
bucket = buckets[i]
if bucket["used"]:
cb(bucket["storage"].cast(entry_type_ptr))
@staticmethod
def _iter_hashmap(val, cb):
table = val["m_table"]
AKHashMapPrettyPrinter._iter_hashtable(table, lambda entry: cb(entry["key"], entry["value"]))
def to_string(self):
return AKHashMapPrettyPrinter.prettyprint_type(self.val.type)
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def children(self):
elements = []
def cb(key, value):
nonlocal elements
elements.append((f"[{key}]", value))
AKHashMapPrettyPrinter._iter_hashmap(self.val, cb)
return elements
@classmethod
def prettyprint_type(cls, type):
template_types = list(type.template_argument(i) for i in (0, 1))
key, value = list(handler_class_for_type(t).prettyprint_type(t) for t in template_types)
return f'AK::HashMap<{key}, {value}>'
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class AKSinglyLinkedList:
def __init__(self, val):
self.val = val
def to_string(self):
return AKSinglyLinkedList.prettyprint_type(self.val.type)
def children(self):
elements = []
node = self.val["m_head"]
while node != 0:
elements.append(node["value"])
node = node["next"]
return [(f"[{i}]", elements[i]) for i in range(len(elements))]
@classmethod
def prettyprint_type(cls, type):
template_type = type.template_argument(0)
return f'AK::SinglyLinkedList<{handler_class_for_type(template_type).prettyprint_type(template_type)}>'
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class VirtualAddress:
def __init__(self, val):
self.val = val
def to_string(self):
return self.val["m_address"]
@classmethod
def prettyprint_type(cls, type):
return 'VirtualAddress'
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class SerenityPrettyPrinterLocator(gdb.printing.PrettyPrinter):
def __init__(self):
super(SerenityPrettyPrinterLocator, self).__init__("serenity_pretty_printers", [])
def __call__(self, val):
type = gdb.types.get_basic_type(val.type)
handler = handler_class_for_type(type)
if handler is UnhandledType:
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return None
return handler(val)
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gdb.printing.register_pretty_printer(None, SerenityPrettyPrinterLocator(), replace=True)
class FindThreadCmd(gdb.Command):
"""
Find SerenityOS thread for the specified TID.
find_thread TID
"""
def __init__(self):
super(FindThreadCmd, self).__init__(
"find_thread", gdb.COMMAND_USER
)
def _find_thread(self, tid):
threads = gdb.parse_and_eval("Kernel::Thread::g_tid_map")
thread = None
def cb(key, value):
nonlocal thread
if int(key["m_value"]) == tid:
thread = value
AKHashMapPrettyPrinter._iter_hashmap(threads, cb)
return thread
def complete(self, text, word):
return gdb.COMPLETE_SYMBOL
def invoke(self, args, from_tty):
argv = gdb.string_to_argv(args)
if len(argv) == 0:
gdb.write("Argument required (TID).\n")
return
tid = int(argv[0])
thread = self._find_thread(tid)
if not thread:
gdb.write(f"No thread with TID {tid} found.\n")
else:
gdb.write(f"{thread}\n")
FindThreadCmd()