#!/bin/sh

# src/tools/find_typedef

# This script attempts to find all typedef's in the postgres binaries
# by using 'objdump' or local equivalent to print typedef debugging symbols.
# We need this because pgindent needs a list of typedef names.
#
# For this program to work, you must have compiled all code with
# debugging symbols.
#
# We intentionally examine all files in the targeted directories so as to
# find both .o files and executables.  Therefore, ignore error messages about
# unsuitable files being fed to objdump.
#
# This is known to work on Linux and on some BSDen, including macOS.
#
# Caution: on the platforms we use, this only prints typedefs that are used
# to declare at least one variable or struct field.  If you have say
# "typedef struct foo { ... } foo;", and then the structure is only ever
# referenced as "struct foo", "foo" will not be reported as a typedef,
# causing pgindent to indent the typedef definition oddly.  This is not a
# huge problem, since by definition there's just the one misindented line.
#
# We get typedefs by reading "STABS":
#    http://www.informatik.uni-frankfurt.de/doc/texi/stabs_toc.html


if [ "$#" -eq 0 -o ! -d "$1" ]
then	echo "Usage:  $0 postgres_binary_directory [...]" 1>&2
	exit 1
fi

for DIR
do	# if objdump -W is recognized, only one line of error should appear
	if [ `objdump -W 2>&1 | wc -l` -eq 1 ]
	then	# Linux
		objdump -W "$DIR"/* |
		egrep -A3 '\(DW_TAG_typedef\)' |
		awk ' $2 == "DW_AT_name" {print $NF}'
	elif [ `readelf -w 2>&1 | wc -l` -gt 1 ]
	then	# FreeBSD, similar output to Linux
		readelf -w "$DIR"/* |
		egrep -A3 '\(DW_TAG_typedef\)' |
		awk ' $1 == "DW_AT_name" {print $NF}'
	fi
done |
grep -v ' ' | # some typedefs have spaces, remove them
sort |
uniq |
# these are used both for typedefs and variable names
# so do not include them
egrep -v '^(date|interval|timestamp|ANY)$'
