configure.in
author Andrew McCreight <continuation@gmail.com>
Mon, 22 Apr 2019 16:34:51 +0000
changeset 470376 3073770e06f157040f4c64951b7e8425e1ad7bbe
parent 310121 54cf74de41dfa8dfd04fcdf01616609e7f7e2704
permissions -rw-r--r--
Bug 1535403 - Take indirection into account for the CC optimizations for the outer window wrapper. r=peterv Most wrapper cached C++ objects are held alive by their wrapper. The cycle collector takes advantage of this in many classes and ignores the C++ object if the wrapper is marked black. However, this is not true for the outer window's wrapper. Instead, the outer window's wrapper keeps the inner window alive. The inner window usually keeps its outer window alive, but not after it has been unlinked. For reasons I do not yet understand, the outer window's wrapper can be kept alive after the inner window it is a proxy for is unlinked. This patch fixes the cycle collector optimization for the outer window by only applying it if the outer window still has a weak reference to the inner window, which it will until the inner no longer holds the outer alive. This in turn fixes, or at least helps fix, window leaks seen intermittently when the lifetime of outer windows and docshells are tied together. The code comment is based on a review comment by peterv. Differential Revision: https://phabricator.services.mozilla.com/D27981

#!/bin/sh
# 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/.
#
# Welcome to the new world of configure. We're working on moving to a
# python based configure. In the meanwhile, remains of the old autoconf
# based configure is in old-configure.in.
# If you need to add something, please come talk to the build system
# peers for now.
#
# Because adding a configure file in the tree is going to conflict with
# existing configure files in people's (and automation) work trees, and
# because some automation jobs are still running autoconf and configure
# "manually", this file is actually an m4 file that is processed by
# autoconf, but doesn't call any autoconf macros. The `divert` line
# below ensures the script that follows is output by autoconf.
: "divert(0)dnl"
#!/bin/sh

SRCDIR=$(dirname $0)
TOPSRCDIR="$SRCDIR"
export OLD_CONFIGURE="$SRCDIR"/old-configure

which python2.7 > /dev/null && exec python2.7 "$TOPSRCDIR/configure.py" "$@" || exec python "$TOPSRCDIR/configure.py" "$@"