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#!/bin/bash

# Copyright (C) 2006, 2008 Free Software Foundation

#

# Analyze changes in GCC DejaGNU test logs for binutils, gcc, gdb, etc.

# Original version written in 2005 by James Lemke <jwlemke@wasabisystems.com>.

#

# See usage() below.

usage () {

    cat <<EOF >&2

Usage:

    dg-cmp-results.sh [-v] [-v] [-v] <variant-name> <old-file> <new-file>

    <variant-name> names the desired variant, "/" must be written as "\/".

    Use the empty string ("") for the first variant in each file.

    Output is to stdout.

    Non-verbose output is degradation info like PASS->FAIL.

    -v adds improvement info like FAIL->PASS.

    -v -v adds info like tests that are no longer run.

    -v -v -v adds info for tests that have not changed status.

    -v -v -v -v is used for debugging.

EOF

}

verbose=0

while test "$1" = "-v"; do

    verbose=`expr $verbose + 1`

    shift

done

if test $# -ne 3 ; then

    usage

    exit 1

fi

if test ! -f "$2"; then

    echo "unable to open $2" >&2

    exit 1

fi

if test ! -f "$3"; then

    echo "unable to open $3" >&2

    exit 1

fi

# Command differences for various platforms.

case `uname -s` in

Darwin|NetBSD)

    E=-E        # sed

    ;;

*)

    E=-r        # sed

    ;;

esac

# sections are identified by separator lines beginning with '\t\t==='.

# section 0 identifies run date, target, and host.

# section 1 and subsequent contain test data for a target variant.

# -skip to /^Running target/ and use that line to identify the variant.

# -subsequent lines contain the result data.  They begin with:

# '(PASS|FAIL|XFAIL|XPASS|UNTESTED|UNSUPPORTED|UNRESOLVED):'

VARIANT="$1"

OFILE="$2"

OBASE=`basename "$2"`

NFILE="$3"

NBASE=`basename "$3"`

echo "dg-cmp-results.sh: Verbosity is ${verbose}, Variant is \"${VARIANT}\""

echo

header="^Running target $VARIANT"

temp=`grep "$header" $OFILE`

if test -z "$temp"; then

    echo "Error: variant \"$VARIANT\" not found in $OFILE."

    exit 1

fi

temp=`grep "$header" $NFILE`

if test -z "$temp"; then

    echo "Error: variant \"$VARIANT\" not found in $NFILE."

    exit 1

fi

unset temp

# Copy out the old file's section 0.

echo "Older log file: $OFILE"

sed $E -e '/^[[:space:]]+===/,$d' $OFILE

# Copy out the new file's section 0.

echo "Newer log file: $NFILE"

sed $E -e '/^[[:space:]]+===/,$d' $NFILE

# Create a temporary file from the old file's interesting section.

sed $E -e "1,/$header/d" \

  -e '/^[[:space:]]+===/,$d' \

  -e '/^[A-Z]+:/!d' \

  -e '/^(WARNING|ERROR):/d' \

  -e 's/\r$//' \

  -e 's/^/O:/' \

  $OFILE |

  sort -s -t : -k 3b - \

  >/tmp/o$$-$OBASE

# Create a temporary file from the new file's interesting section.

sed $E -e "1,/$header/d" \

  -e '/^[[:space:]]+===/,$d' \

  -e '/^[A-Z]+:/!d' \

  -e '/^(WARNING|ERROR):/d' \

  -e 's/\r$//' \

  -e 's/^/N:/' \

  $NFILE |

  sort -s -t : -k 3b - \

  >/tmp/n$$-$NBASE

# Merge the two files, then compare adjacent lines.

# Comparison is complicated by tests that may be run multiple times.

# If that case, we assume that the order is the same in both files.

cat <<EOF >compare-$$.awk

BEGIN {

    FS = ":"

    queue1 = 1; queueN = 0; status[queue1] = ""; name[queue1] = ""

    verbose = verbose + 0       # Make sure it's defined.

}

# FIFO circular queue

function push(st, nm) {

    queueN += 1; status[queueN] = st; name[queueN] = nm

}

function peek() {

    result = 0

    if (queueN >= queue1) result = queue1

    return result

}

function drop() {

    queue1 += 1

    if (queue1 > queueN) { queue1 = 1; queueN = 0; }

}

function compare(st, nm) {

    old = peek()

    if (old == 0) {

        # This new test wasn't run last time.

        if (verbose >= 2) printf("NA->%s:%s\n", st, nm)

    }

    else {

        # Compare this new test to the first queued old one.

        if (verbose >= 4) {

            printf("Comparing two lines:\n O:%s:%s\n N:%s:%s\n",

             status[old], name[old], st, nm)

        }

        if (name[old] != nm) {

            # The old test wasn't run this time and

            # the new test wasn't run last time.

            if (verbose >= 2) {

                printf("%s->NA:%s\n", status[old], name[old])

                if (nm != "") printf("NA->%s:%s\n", st, nm)

            }

            drop()

        }

        else {

            notable = 0

            if (status[old] == st) {

                # Status of this test has not changed.

                if (verbose >= 3) printf("%s:%s\n", st, nm)

            }

            else if(status[old] == "PASS" && st == "XFAIL") {

                if (verbose >= 1) notable = 1

            }

            else if(status[old] == "PASS" || st == "FAIL") {

                # Test did pass but doesn't now

                # or didn't fail but does now.

                notable = 1

            }

            else if(st == "PASS") {

                # Test didn't pass but does now.

                if (verbose >= 1) notable = 1

            }

            else if(verbose >= 2) {

                # Miscellaneous status change.

                notable = 1

            }

            if (notable > 0) printf("%s->%s:%s\n", status[old], st, nm)

            drop()

        }

    }

}

/^O:/ {

    while (old = peek()) {

        if (name[old] == \$3) break;

        # The queued test is no longer run.

        compare("", "");

    }

    # Save this test for later comparison.

    push(\$2, \$3)

}

/^N:/ {

    compare(\$2, \$3)

}

END {

    while (old = peek()) compare("", "")

}

EOF

sort -m -s -t : -k 3b /tmp/o$$-$OBASE /tmp/n$$-$NBASE |

 awk -v verbose=$verbose -f compare-$$.awk /dev/stdin

# Delete the temporary files.

rm -f compare-$$.awk /tmp/o$$-$OBASE /tmp/n$$-$NBASE

exit 0