Tools/Scripts/extract-tbds-from-internal-sdk

#!/bin/sh -e

function usage {
    cat <<EOF
usage: $0 [ -h ] [ -b BUILD_DIR ] [ -w ARGS ] SRC_SDK DST_SDK [

    This script looks at build products produced by an Apple internal build to
    determine which private frameworks WebKit uses. It then copies TBD stubs of
    those frameworks from an internal SDK, and strips them of symbols not used
    by the WebKit build. This process is manually run as part of the
    open-source build bringup when new Xcode SDKs are released.

    SRC_SDK         path to an internal SDK to extract framework stubs from
    DST_SDK         path to copy framework stubs to, typically in WebKitLibraries/SDKs
    -b BUILD_DIR    directory to read WebKit binaries from (defaults to webkit-build-directory)
    -w ARGS         additional arguments to pass to webkit-build-directory (e.g. --ios-simulator)
    -h              print this help message
EOF
    exit 1
}

function error {
    echo "error: $1" &1>2
    usage
}

function run {
    echo ">" $"\033[1m"$@$"\033[0m" 1>&2
    "$@"
}

while getopts b:w:e:h OPT; do
case $OPT in
    b) build_dir="$OPTARG" ;;
    w) wbd_args="$OPTARG" ;;
    h) usage ;;
    ?) usage ;;
esac
done
shift $((OPTIND-1))

internal_sdk_dir="$1"
sparse_sdk_dir="$2"
shift 2

[ -n "${internal_sdk_dir}" ] || error "missing source SDK to extract from"
[ -n "${sparse_sdk_dir}" ] || error "missing destination SDK to copy to"
[ -n "${build_dir}" ] || build_dir="$(webkit-build-directory ${wbd_args} --configuration )"
export_list="$(mktemp -t WebKit.exp)"

# Binaries known to link against private frameworks in some configurations.
interesting_executables=(
    "$build_dir/WebCore.framework/WebCore"
    "$build_dir/WebKit.framework/WebKit"
    "$build_dir/webpushd"
    "$build_dir/TestWebKitAPI"
    "$build_dir/WebKitTestRunnerApp.app/WebKitTestRunnerApp"
)
webkit_private_frameworks="(WebCore|WebInspectorUI|WebKitLegacy)\.framework"

# 1. Using the build products given, find the dylibs in PrivateFrameworks that
# we link against. Create an export list from the build products scanned, which
# will included the needed symbols from these dylibs.
tbds=()
for x in "${interesting_executables[@]}"; do
    for fwk in `run otool -L "$x" | grep PrivateFrameworks | grep -vE "${webkit_private_frameworks}" | awk '{ print $1 }'`; do
        tbds+=("${fwk%.dylib}.tbd")
    done
    run nm -gj "$x" >> "${export_list}"
done

# 2. Copy TBDs for the identified dylibs to the sparse SDK.
for tbd in `echo "${tbds[@]}" | sort | uniq`; do
    run ditto "${internal_sdk_dir}${tbd}" "${sparse_sdk_dir}${tbd}"
done

# 3. Strip the symbols WebKit is not using from the TBDs.
run strip-tbd -s "${export_list}" "${tbds[@]/#/${sparse_sdk_dir}}"