From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- build/pure_virtual/moz.build | 23 +++++++++++++++++++++++ build/pure_virtual/pure_virtual.c | 27 +++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) create mode 100644 build/pure_virtual/moz.build create mode 100644 build/pure_virtual/pure_virtual.c (limited to 'build/pure_virtual') diff --git a/build/pure_virtual/moz.build b/build/pure_virtual/moz.build new file mode 100644 index 0000000000..2e5169fec6 --- /dev/null +++ b/build/pure_virtual/moz.build @@ -0,0 +1,23 @@ +# -*- 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/. + +Library("pure_virtual") + +SOURCES += ["pure_virtual.c"] + +FORCE_STATIC_LIB = True + +USE_STATIC_LIBS = True + +# Build a real library so that the linker can remove it if the symbol +# is never used. +NO_EXPAND_LIBS = True + +# LTO can mess things up. +if CONFIG["CC_TYPE"] == "clang-cl": + CFLAGS += ["-clang:-fno-lto"] +else: + CFLAGS += ["-fno-lto"] diff --git a/build/pure_virtual/pure_virtual.c b/build/pure_virtual/pure_virtual.c new file mode 100644 index 0000000000..23b18f2aae --- /dev/null +++ b/build/pure_virtual/pure_virtual.c @@ -0,0 +1,27 @@ +/* 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/. */ + +#include + +// This function is used in vtables to point at pure virtual methods. +// The implementation in the standard library usually aborts, but +// the function is normally never called (a call would be a bug). +// Each of these entries in vtables, however, require an unnecessary +// dynamic relocation. Defining our own function makes the linker +// point the vtables here instead of the standard library, replacing +// the dynamic relocations with relative relocations. +// +// On Windows, it doesn't really make a difference, but on macOS it +// can be packed better, saving about 10KB in libxul, and on 64-bits +// ELF systems, with packed relative relocations, it saves 140KB. +// +// Another advantage of having our own is that we can use MOZ_CRASH +// instead of the system's abort. +#ifdef _MSC_VER +int __cdecl _purecall() { MOZ_CRASH("pure virtual call"); } +#else +__attribute__((visibility("hidden"))) void __cxa_pure_virtual() { + MOZ_CRASH("pure virtual call"); +} +#endif -- cgit v1.2.3