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scripts: Improved cycle detection notes in scripts

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- Prevented childrenof memoization from hiding the source of a
  detected cycle.

- Deduplicated multiple cycle detected notes.

- Fixed note rendering when last column does not have a notes list.
  Currently this only happens when entry is None (no results).
This commit is contained in:
Christopher Haster
2024-12-07 00:55:00 -06:00
parent 56d888933f
commit ac79c88c6f
9 changed files with 91 additions and 37 deletions
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37
scripts/ctx.py
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@ -157,7 +157,8 @@ class CtxResult(co.namedtuple('CtxResult', [
else other.i if self.i is None
else min(self.i, other.i),
self.children + other.children,
self.notes + other.notes)
list(co.OrderedDict.fromkeys(it.chain(
self.notes, other.notes)).keys()))
def openio(path, mode='r', buffering=-1):
@ -681,7 +682,7 @@ def collect(obj_paths, *,
def childrenof(entry, seen=set()):
# found a cycle? stop here
if entry.off in seen:
return [], ['cycle detected']
return [], ['cycle detected'], True
# cached?
if not hasattr(childrenof, 'cache'):
childrenof.cache = {}
@ -690,7 +691,7 @@ def collect(obj_paths, *,
# pointer? deref and include size
if entry.tag == 'DW_TAG_pointer_type':
children, notes = [], []
children, notes, dirty = [], [], False
if 'DW_AT_type' in entry:
type = info[int(entry['DW_AT_type'].strip('<>'), 0)]
# skip modifiers to try to find name
@ -702,8 +703,9 @@ def collect(obj_paths, *,
and type.tag != 'DW_TAG_subroutine_type'):
name_ = type.name
size_ = sizeof(type, seen | {entry.off})
children_, notes_ = childrenof(
children_, notes_, dirty_ = childrenof(
type, seen | {entry.off})
dirty = dirty or dirty_
children.append(CtxResult(file, name_, size_,
children=children_,
notes=notes_))
@ -711,14 +713,15 @@ def collect(obj_paths, *,
elif entry.tag in {
'DW_TAG_structure_type',
'DW_TAG_union_type'}:
children, notes = [], []
children, notes, dirty = [], [], False
for child in entry.children:
if child.tag != 'DW_TAG_member':
continue
name_ = child.name
size_ = sizeof(child, seen | {entry.off})
children_, notes_ = childrenof(
children_, notes_, dirty_ = childrenof(
child, seen | {entry.off})
dirty = dirty or dirty_
children.append(CtxResult(file, name_, size_,
i=child.off,
children=children_,
@ -727,7 +730,7 @@ def collect(obj_paths, *,
elif entry.tag in {
'DW_TAG_base_type',
'DW_TAG_subroutine_type'}:
children, notes = [], []
children, notes, dirty = [], [], False
# a modifier?
elif (entry.tag in {
'DW_TAG_typedef',
@ -740,17 +743,18 @@ def collect(obj_paths, *,
'DW_TAG_restrict_type'}
and 'DW_AT_type' in entry):
type = int(entry['DW_AT_type'].strip('<>'), 0)
children, notes = childrenof(
children, notes, dirty = childrenof(
info[type], seen | {entry.off})
# void?
elif ('DW_AT_type' not in entry
and 'DW_AT_byte_size' not in entry):
children, notes = [], []
children, notes = [], [], False
else:
assert False, "Unknown dwarf entry? %r" % entry.tag
childrenof.cache[entry.off] = children, notes
return children, notes
if not dirty:
childrenof.cache[entry.off] = children, notes, dirty
return children, notes, dirty
# find each function's context
for sym in syms:
@ -796,7 +800,7 @@ def collect(obj_paths, *,
size_ = sizeof(param)
# find children, recursing if necessary
children_, notes_ = childrenof(param)
children_, notes_, _ = childrenof(param)
params.append(CtxResult(file, name_, size_,
i=param.off,
@ -1078,8 +1082,13 @@ def table(Result, results, diff_results=None, *,
getattr(r, k, None),
getattr(diff_r, k, None)))))
# append any notes
if hasattr(Result, '_notes'):
entry[-1][1].extend(getattr(r, Result._notes))
if hasattr(Result, '_notes') and r is not None:
notes = getattr(r, Result._notes)
if isinstance(entry[-1], tuple):
entry[-1] = (entry[-1][0], entry[-1][1] + notes)
else:
entry[-1] = (entry[-1], notes)
return entry
# recursive entry helper, only used by some scripts