luchianmihai/walnux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

tools/gdb: support string type in offset_of

Browse source 
1. Support any type of value as pointer address in container_of
2. Support string as type in offset_of
3. Make sure type is a pointer in container_of, and not a pointer in
   offset_of

Signed-off-by: xuxingliang <xuxingliang@xiaomi.com>
This commit is contained in:
xuxingliang 2024-10-01 10:30:32 +08:00 • committed by Xiang Xiao
parent d02dc3893c
commit e3b3da3bd1
1 changed files with 38 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
tools/gdb/nuttxgdb/utils.py
View file

@ -86,24 +86,53 @@ def get_long_type():
return long_type
def offset_of(typeobj: gdb.Type, field: str) -> Union[int, None]:
def offset_of(typeobj: Union[gdb.Type, str], field: str) -> Union[int, None]:
"""Return the offset of a field in a structure"""
if type(typeobj) is str:
typeobj = gdb.lookup_type(typeobj)
if typeobj.code is gdb.TYPE_CODE_PTR:
typeobj = typeobj.target()
for f in typeobj.fields():
if f.name == field:
return f.bitpos // 8 if f.bitpos is not None else None
if f.bitpos is None:
break
return f.bitpos // 8
return None
raise gdb.GdbError(f"Field {field} not found in type {typeobj}")
def container_of(
ptr: gdb.Value, typeobj: Union[gdb.Type, str], member: str
ptr: Union[gdb.Value, int], typeobj: Union[gdb.Type, str], member: str
) -> gdb.Value:
"""Return pointer to containing data structure"""
"""
Return a pointer to the containing data structure.
Args:
ptr: Pointer to the member.
t: Type of the container.
member: Name of the member in the container.
Returns:
gdb.Value of the container.
Example:
struct foo {
int a;
int b;
};
struct foo *ptr = container_of(&ptr->b, "struct foo", "b");
"""
if isinstance(typeobj, str):
typeobj = lookup_type(typeobj)
return gdb.Value(int(ptr.dereference().address) - offset_of(typeobj, member)).cast(
typeobj.pointer()
)
typeobj = gdb.lookup_type(typeobj).pointer()
if typeobj.code is not gdb.TYPE_CODE_PTR:
typeobj = typeobj.pointer()
addr = gdb.Value(ptr).cast(long_type)
return gdb.Value(addr - offset_of(typeobj, member)).cast(typeobj)
class ContainerOf(gdb.Function):