1 files changed, 82 insertions, 0 deletions
diff --git a/scripts/gen-cdefs.sh b/scripts/gen-cdefs.sh
new file mode 100755
index 0000000..ddb0aa7
--- /dev/null
+++ b/scripts/gen-cdefs.sh
@@ -0,0 +1,82 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0-or-later
+set -o pipefail -o errexit
+
+if [ "$2" != types ] && [ "$2" != functions ]; then
+	echo "Usage: $0 libkres (types|functions)" >&2
+	echo "    and input identifiers, one per line." >&2
+	echo "    You need debug symbols in the library." >&2
+	echo
+	echo "    If you call this on a type that's a typedef, it gets expanded." >&2
+	echo "    To avoid that, prefix the identifier with 'typedef '." >&2
+	exit 1
+fi
+
+if ! command -v gdb >/dev/null; then
+	echo "Failed to find gdb" >&2
+	exit 1
+fi
+
+if ! command -v sed >/dev/null; then
+	echo "Failed to find GNU sed" >&2
+	exit 1
+fi
+
+if ! sed --version | head -1 | grep -q "GNU sed"; then
+	echo "GNU sed required to run this script" >&2
+fi
+
+# be very precise with the directories for libraries to not pick wrong library
+case "$1" in
+	libknot) library="$(PATH="$(pkg-config libknot --variable=libdir)" command -v "$1.so")" ;;
+	libzscanner) library="$(PATH="$(pkg-config libzscanner --variable=libdir)" command -v "$1.so")" ;;
+	*) library="$(command -v "$1")"  # use absolute path to library
+esac
+
+if [ -z "$library" ]; then
+	echo "$1 not found.  Note: only .so platforms work currently." >&2
+	exit 1
+fi
+
+# Let's use an array to hold command-line arguments, to simplify quoting.
+GDB=(gdb)
+GDB+=(-n -quiet -batch "-symbols=$library")
+GDB+=(-iex "set width unlimited" -iex "set max-value-size unlimited")
+
+grep -v '^#\|^$' | while read -r ident; do
+	if [ "$2" = functions ]; then
+		output="$("${GDB[@]}" --ex "info functions ^$ident\$" \
+				| sed '0,/^All functions/ d; /^File .*:$/ d')"
+	else # types
+		case "$ident" in
+			struct\ *|union\ *|enum\ *)
+				output="$("${GDB[@]}" --ex "ptype $ident" \
+						| sed '0,/^type = /s/^type = /\n/; $ s/$/;/')"
+				;;
+			typedef\ *) # typedef that shouldn't be expanded
+				output="$("${GDB[@]}" --ex "info types ^"$(echo "$ident" | sed 's/^typedef //')"\$" \
+						| sed -e '0,/^File .*:$/ d' -e '/^File .*:$/,$ d')"
+						# we need to stop early to remove ^^ multiple matches
+				;;
+			*) # we assume it's a typedef that should be expanded
+				output="$("${GDB[@]}" --ex "ptype $ident" \
+						| sed "0,/^type = /s/^type = /typedef /; $ s/$/ $ident;/")"
+				;;
+		esac
+	fi
+	# LuaJIT FFI blows up on "uint" type
+	output="$(echo "$output" | sed 's/\buint\b/unsigned int/g')"
+	# GDB 8.2+ added source line prefix to output
+	output="$(echo "$output" | sed 's/^[0-9]\+:[[:space:]]*//g')"
+	# use tabs instead of spaces
+	output="$(echo "$output" | sed 's/    /\t/g')"
+
+	# abort on empty output
+	if [ -z "$(echo "$output" | tr -d "\n;")" ]; then
+		echo "Failed to find cdef of $ident" >&2
+		exit 1
+	fi
+	echo "$output" | grep -v '^$'
+done
+
+exit 0