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#!/bin/bash
#############################################################################
##
## Copyright (C) 2015 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is the build configuration utility of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:LGPL21$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see http://www.qt.io/terms-conditions. For further
## information use the contact form at http://www.qt.io/contact-us.
##
## GNU Lesser General Public License Usage
## Alternatively, this file may be used under the terms of the GNU Lesser
## General Public License version 2.1 or version 3 as published by the Free
## Software Foundation and appearing in the file LICENSE.LGPLv21 and
## LICENSE.LGPLv3 included in the packaging of this file. Please review the
## following information to ensure the GNU Lesser General Public License
## requirements will be met: https://www.gnu.org/licenses/lgpl.html and
## http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
##
## As a special exception, The Qt Company gives you certain additional
## rights. These rights are described in The Qt Company LGPL Exception
## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
##
## $QT_END_LICENSE$
##
#############################################################################
script_argument_prefix="-Wobjc_namespace,--"
required_arguments="target suffix original_ld"
optional_arguments="exclude_list exclude_regex slient"
for argument in $required_arguments $optional_arguments; do
declare "$argument="
done
declare -i silent=0
declare -a linker_arguments
for i in "$@"; do
case $1 in
$script_argument_prefix*)
declare "${1#$script_argument_prefix}"
;;
-o)
if [ -n "$2" ]; then
target="$2"
fi
linker_arguments+=("$1")
;;
*)
linker_arguments+=("$1")
;;
esac
shift
done
get_entry() {
local map=$1 key=$2
local i="${map}_map_${2}"
printf '%s' "${!i}"
}
error() {
echo "$0: error: $*" >&2
exit 1
}
for argument in $required_arguments; do
if [ -z "${!argument}" ]; then
error "missing argument --${argument}"
fi
done
# Normalize suffix so we can use it as a bash variable
suffix=${suffix//[-. ]/_}
link_binary() {
(PS4=; test $silent -ne 1 && set -x; $original_ld "${linker_arguments[@]}" "$@") 2>&1 || exit 1
}
sanitize_address() {
local address="$1"
address=${address#0x} # Remove hex prefix
address=${address: ${#address} < 8 ? 0 : -8} # Limit to 32-bit
echo "0x$address"
}
read_binary() {
local address=$1
local length=$2
dd if="$target" bs=1 iseek=$address count=$length 2>|/dev/null
}
read_32bit_value() {
local address=$1
read_binary $address 4 | xxd -p | dd conv=swab 2>/dev/null | rev
}
inspect_binary() {
inspect_mode="$1"
echo -n "🔎 Inspecting binary '$target', "
if [ ! -f "$target" ]; then
echo "target does not exist!"
exit 1
fi
read -a mach_header <<< "$(otool -h "$target" -v | tail -n 1)"
if [ "${mach_header[1]}" != "X86_64" ]; then
echo "binary is not 64-bit, only 64-bit binaries are supported!"
exit 1
fi
classnames_section="__objc_classname"
classnames=$(otool -v -s __TEXT $classnames_section "$target" | tail -n +3)
while read -a classname; do
address=$(sanitize_address ${classname[0]})
name=${classname[1]}
declare "address_to_classname_map_$address=$name"
declare "classname_to_address_map_$name=$address"
done <<< "$classnames"
extra_classnames_file="$(mktemp -t ${classnames_section}_additions).S"
if [ "$inspect_mode" == "inject_classnames" ]; then
echo "class names have not been namespaced, adding suffix '$suffix'..."
printf ".section __TEXT,$classnames_section,cstring_literals,no_dead_strip\n" > $extra_classnames_file
elif [ "$inspect_mode" == "patch_classes" ]; then
echo "found namespaced class names, updating class entries..."
fi
classes=$(otool -o "$target" | grep class_ro_t)
while read -a class; do
address="$(sanitize_address ${class[1]})"
class_flags="0x$(read_32bit_value $address)"
if [ -z "$class_flags" ]; then
echo " 💥 failed to read class flags for class at $address"
continue
fi
is_metaclass=$(($class_flags & 0x1))
name_offset=$(($address + 24))
classname_address="0x$(read_32bit_value $name_offset)"
if [ -z "$classname_address" ]; then
echo " 💥 failed to read class name address for class at $address"
continue
fi
classname=$(get_entry address_to_classname $classname_address)
if [ -z "$classname" ]; then
echo " 💥 failed to resolve class name for address '$classname_address'"
continue
fi
if [[ $exclude_list =~ $classname || $classname =~ $exclude_regex ]]; then
if [ $is_metaclass -eq 1 ]; then
class_type="meta class"
else
class_type="class"
fi
echo " 🚽 skipping excluded $class_type '$classname'"
continue
fi
newclassname="${classname}_${suffix}"
if [ "$inspect_mode" == "inject_classnames" ]; then
if [ $is_metaclass -eq 1 ]; then
continue
fi
echo " 💉 injecting $classnames_section entry '$newclassname' for '$classname'"
printf ".asciz \"$newclassname\"\n" >> $extra_classnames_file
elif [ "$inspect_mode" == "patch_classes" ]; then
newclassname_address=$(get_entry classname_to_address ${newclassname})
if [ -z "$newclassname_address" ]; then
echo " 💥 failed to resolve class name address for class '$newclassname'"
continue
fi
if [ $is_metaclass -eq 1 ]; then
class_type="meta"
else
class_type="class"
fi
echo " 🔨 patching class_ro_t at $address ($class_type) from $classname_address ($classname) to $newclassname_address ($newclassname)"
echo ${newclassname_address: -8} | rev | dd conv=swab 2>/dev/null | xxd -p -r -seek $name_offset -l 4 - "$target"
fi
done <<< "$classes"
}
echo "🔩 Linking binary using '$original_ld'..."
link_binary
inspect_binary inject_classnames
echo "🔩 Re-linking binary with extra __objc_classname section..."
link_binary $extra_classnames_file
inspect_binary patch_classes
|
