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#! /bin/bash
#
# Run "java -Xshare:dump" twice. They should generate the exact same classes.jsa.
# See https://bugs.openjdk.java.net/browse/JDK-8241071
#
# Usage: bash compare_cds_dump.sh $JAVA_HOME
#
# If "xxd" is not available, use "hexdump" instead.
# 
# "xxd -g 8" is used because most of the time we have mismatched (64-bit) pointers.
# you may want to change to "-g 4", etc, if the mismatch is caused by fields
# of other sizes.

JAVA=$1/bin/java
shift

ARGS="-Xshare:dump -Xlog:cds=debug -Xmx256m"
$JAVA $ARGS -XX:SharedArchiveFile=1.jsa $* | egrep " crc " | cut -b 9- | tee old1.txt
cksum 1.jsa | tee -a old 1.txt
xxd -e -g 8 1.jsa >> 1.txt
hexdump#hexdump -C 1.jsa >> old1.txt

$JAVA $ARGS -XX:SharedArchiveFile=2.jsa $* | egrep " crc " | cut -b 9- | tee new2.txt
cksum 2.jsa | tee -a new 2.txt
xxd -e -g 8 2.jsa >> 2.txt
hexdump#hexdump -C 2.jsa >> new2.txt

(set -x; 
diff old1.txt new2.txt | wc
)