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#!/bin/bash
function decompile {
# Decompile class and include private members. In preparation for the
# hashing below, strip references on the form #[0-9]+.
javap -c -p "$1" \
| sed '/^Compiled from /d' \
| sed '/^[ ]*}[ ]*$/d' \
| sed 's/[ ]\(#[1-9][0-9]*\)[ ,]/ /' \
| sed 's/[ ]\([0-9]*[:]\)//' \
| sed 's/[ ][ ]*/ /g' \
| sed '/Code:$/,/^$/s/^[ ]*\([^ ]\)/ \1/g' \
| sed '/Code:$/d' \
| sed 's/ *{$//'
}
function hash_bodies {
# Generate hashes of the instructions making up the method bodies; Yields
# more concise summaries.
awk '/^[ ]{0,3}[^ ]/{if (x)print x"\n";x="";}{x=(!x)?$0"\n--":x" "$0;}END{print x;}' \
| sed '/^--[ ]*$/d' \
| awk "{ if(/^--/) system(\"printf ' '; (echo '\"\$0\"' | shasum --algorithm 256)\"); else print }" \
| sed 's/[ ][ ]*-$//'
}
if [[ "$1" == "-s" ]]; then
shift 1
decompile "$1" | hash_bodies
else
javap -c -s -p -verbose "$1"
fi