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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /python/gdbpp/gdbpp/linkedlist.py | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'python/gdbpp/gdbpp/linkedlist.py')
-rw-r--r-- | python/gdbpp/gdbpp/linkedlist.py | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/python/gdbpp/gdbpp/linkedlist.py b/python/gdbpp/gdbpp/linkedlist.py new file mode 100644 index 0000000000..1ba25a1cf0 --- /dev/null +++ b/python/gdbpp/gdbpp/linkedlist.py @@ -0,0 +1,48 @@ +# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*- +# vim: set filetype=python: +# 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 http://mozilla.org/MPL/2.0/. + +from gdbpp import GeckoPrettyPrinter + + +# mfbt's LinkedList<T> is a doubly-linked list where the items in the list store +# the next/prev pointers as part of themselves rather than the list structure be +# its own independent data structure. This means: +# - Every item may belong to at most one LinkedList instance. +# - For our pretty printer, we only want to pretty-print the LinkedList object +# itself. We do not want to start printing every item in the list whenever +# we run into a LinkedListElement<T>. +@GeckoPrettyPrinter("mozilla::LinkedList", "^mozilla::LinkedList<.*>$") +class linkedlist_printer(object): + def __init__(self, value): + self.value = value + # mfbt's LinkedList has the elements of the linked list subclass from + # LinkedListElement<T>. We want its pointer type for casting purposes. + # + # (We want to list pointers since we expect all of these objects to be + # complex enough that we don't want to automatically expand them. The + # LinkedListElement type itself isn't small.) + self.t_ptr_type = value.type.template_argument(0).pointer() + + def children(self): + # Walk mNext until we loop back around to the sentinel. The sentinel + # item always exists and in the zero-length base-case mNext == sentinel, + # so extract that immediately and update it throughout the loop. + sentinel = self.value["sentinel"] + pSentinel = sentinel.address + pNext = sentinel["mNext"] + i = 0 + while pSentinel != pNext: + list_elem = pNext.dereference() + list_value = pNext.cast(self.t_ptr_type) + yield ("%d" % i, list_value) + pNext = list_elem["mNext"] + i += 1 + + def to_string(self): + return str(self.value.type) + + def display_hint(self): + return "array" |