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scripts: Use depth to limit recursive result collection

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If we're not using these results, no reason to collect all of the
children.

Note that we still need to recurse for other measurements (limit, struct
size, etc).

This has a measurable, but small, impact on runtime:

  stack.py -z0 -Y: 0.202s
  stack.py -z1 -Y: 0.162s (~-19.8%)

  ctx.py -z0 -Y: 0.112s
  ctx.py -z1 -Y: 0.098s (~-12.5%)
This commit is contained in:
Christopher Haster
2024-12-10 16:07:32 -06:00
parent 6a6ed0f741
commit 5d777f84ad
2 changed files with 17 additions and 8 deletions
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14
scripts/ctx.py
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@@ -583,6 +583,7 @@ def collect_dwarf_info(obj_path, tags=None, *,
def collect(obj_paths, *,
sources=None,
everything=False,
depth=1,
**args):
results = []
for obj_path in obj_paths:
@@ -678,10 +679,13 @@ def collect(obj_paths, *,
return size
# recursive+cached children finder
def childrenof(entry, seen=set()):
def childrenof(entry, depth, seen=set()):
# found a cycle? stop here
if entry.off in seen:
return [], {'cycle detected'}, True
# stop here?
if depth < 1:
return [], set(), False
# cached?
if not hasattr(childrenof, 'cache'):
childrenof.cache = {}
@@ -708,7 +712,7 @@ def collect(obj_paths, *,
name_ = type.name
size_ = sizeof(type, seen | {entry.off})
children_, notes_, dirty_ = childrenof(
type, seen | {entry.off})
type, depth-1, seen | {entry.off})
children.append(CtxResult(file_, name_, size_,
children=children_,
notes=notes_))
@@ -729,7 +733,7 @@ def collect(obj_paths, *,
name_ = child.name
size_ = sizeof(child, seen | {entry.off})
children_, notes_, dirty_ = childrenof(
child, seen | {entry.off})
child, depth-1, seen | {entry.off})
children.append(CtxResult(file_, name_, size_,
i=child.off,
children=children_,
@@ -753,7 +757,7 @@ def collect(obj_paths, *,
and 'DW_AT_type' in entry):
type = int(entry['DW_AT_type'].strip('<>'), 0)
children, notes, dirty = childrenof(
info[type], seen | {entry.off})
info[type], depth, seen | {entry.off})
# void?
elif ('DW_AT_type' not in entry
and 'DW_AT_byte_size' not in entry):
@@ -815,7 +819,7 @@ def collect(obj_paths, *,
size_ = sizeof(param)
# find children, recursing if necessary
children_, notes_, _ = childrenof(param)
children_, notes_, _ = childrenof(param, depth-2)
params.append(CtxResult(file_, name_, size_,
i=param.off,