import gdb
+
class sd_dump_hashmaps(gdb.Command):
"dump systemd's hashmaps"
def __init__(self):
- super().__init__("sd_dump_hashmaps", gdb.COMMAND_DATA, gdb.COMPLETE_NONE)
+ super().__init__('sd_dump_hashmaps', gdb.COMMAND_DATA, gdb.COMPLETE_NONE)
def invoke(self, arg, _from_tty):
- d = gdb.parse_and_eval("hashmap_debug_list")
- hashmap_type_info = gdb.parse_and_eval("hashmap_type_info")
- uchar_t = gdb.lookup_type("unsigned char")
- ulong_t = gdb.lookup_type("unsigned long")
- debug_offset = gdb.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
+ d = gdb.parse_and_eval('hashmap_debug_list')
+ hashmap_type_info = gdb.parse_and_eval('hashmap_type_info')
+ uchar_t = gdb.lookup_type('unsigned char')
+ ulong_t = gdb.lookup_type('unsigned long')
+ debug_offset = gdb.parse_and_eval('(unsigned long)&((HashmapBase*)0)->debug')
- print("type, hash, indirect, entries, max_entries, buckets, creator")
+ print('type, hash, indirect, entries, max_entries, buckets, creator')
while d:
- h = gdb.parse_and_eval(f"(HashmapBase*)((char*){int(d.cast(ulong_t))} - {debug_offset})")
+ h = gdb.parse_and_eval(f'(HashmapBase*)((char*){int(d.cast(ulong_t))} - {debug_offset})')
- if h["has_indirect"]:
- storage_ptr = h["indirect"]["storage"].cast(uchar_t.pointer())
- n_entries = h["indirect"]["n_entries"]
- n_buckets = h["indirect"]["n_buckets"]
+ if h['has_indirect']:
+ storage_ptr = h['indirect']['storage'].cast(uchar_t.pointer())
+ n_entries = h['indirect']['n_entries']
+ n_buckets = h['indirect']['n_buckets']
else:
- storage_ptr = h["direct"]["storage"].cast(uchar_t.pointer())
- n_entries = h["n_direct_entries"]
- n_buckets = hashmap_type_info[h["type"]]["n_direct_buckets"]
+ storage_ptr = h['direct']['storage'].cast(uchar_t.pointer())
+ n_entries = h['n_direct_entries']
+ n_buckets = hashmap_type_info[h['type']]['n_direct_buckets']
- t = ["plain", "ordered", "set"][int(h["type"])]
+ t = ['plain', 'ordered', 'set'][int(h['type'])]
- print(f'{t}, {h["hash_ops"]}, {bool(h["has_indirect"])}, {n_entries}, {d["max_entries"]}, {n_buckets}')
+ print(f'{t}, {h["hash_ops"]}, {bool(h["has_indirect"])}, {n_entries}, {d["max_entries"]}, {n_buckets}') # fmt: skip
- if arg != "" and n_entries > 0:
- dib_raw_addr = storage_ptr + hashmap_type_info[h["type"]]["entry_size"] * n_buckets
+ if arg != '' and n_entries > 0:
+ dib_raw_addr = storage_ptr + hashmap_type_info[h['type']]['entry_size'] * n_buckets
histogram = {}
for i in range(0, n_buckets):
for dib in sorted(histogram):
if dib != 255:
- print(f"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_entries):.0%} of entries")
+ print(f'{dib:>3} {histogram[dib]:>8} {float(histogram[dib] / n_entries):.0%} of entries') # fmt: skip
else:
- print(f"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_buckets):.0%} of slots")
- s = sum(dib*count for (dib, count) in histogram.items() if dib != 255) / n_entries
- print(f"mean DIB of entries: {s}")
+ print(f'{dib:>3} {histogram[dib]:>8} {float(histogram[dib] / n_buckets):.0%} of slots') # fmt: skip
+ s = sum(dib * count for (dib, count) in histogram.items() if dib != 255) / n_entries
+ print(f'mean DIB of entries: {s}')
blocks = []
current_len = 1
if len(blocks) > 1 and blocks[0][0] == blocks[0][1] and blocks[-1][0] == n_buckets - 1:
blocks[0][1] += blocks[-1][1]
blocks = blocks[0:-1]
- print("max block: {}".format(max(blocks, key=lambda a: a[1])))
- print("sum block lens: {}".format(sum(b[1] for b in blocks)))
- print("mean block len: {}".format(sum(b[1] for b in blocks) / len(blocks)))
+ print(f'max block: {max(blocks, key=lambda a: a[1])}')
+ print(f'sum block lens: {sum(b[1] for b in blocks)}')
+ print(f'mean block len: {sum(b[1] for b in blocks) / len(blocks)}')
+
+ d = d['debug_list_next']
- d = d["debug_list_next"]
sd_dump_hashmaps()