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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at
import gdb
def get_header_ptr(value, ptr_t):
# Return the pointer stored in Cell::header_ for subclasses of
# TenuredCellWithNonGCPointer and CellWithTenuredGCPointer.
return value["header_"]["value_"].cast(ptr_t)
def get_header_length_and_flags(value, cache):
# Return the length and flags values for subclasses of
# CellWithLengthAndFlags.
flags = value["header_"]["value_"].cast(cache.uintptr_t)
length = value["length_"]
except gdb.error:
# If we couldn't fetch the length directly, it must be stored
# within `flags`.
length = flags >> 32
flags = flags % 2**32
return length, flags