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Tools for assessing the risk of changes to the MPS #177

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8ce79af
Adding draft tool script for assessing the risk of changes to the MPS.
rptb1 Feb 24, 2023
68d8282
Clarifying what the columns are for.
rptb1 Feb 24, 2023
511760f
For the purpose of risk, ignoring lines that look like comments.
rptb1 Feb 24, 2023
39ed92f
Output a count of non-comment lines changed. Remove bashism.
rptb1 Feb 24, 2023
4b1265a
Improving output formatting. Fixing shellcheck warnings.
rptb1 Feb 24, 2023
3334f1a
Adding option to select risk column.
rptb1 Feb 24, 2023
35b7281
Adding draft tool script to show C functions changed between commits.
rptb1 Feb 25, 2023
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50 changes: 50 additions & 0 deletions tool/git-fundiff
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#!/bin/sh
# tool/git-fundiff -- C functions changed between commits
#
# Prints a list of functions that differ in a C source file at the
# LLVM intermediate code level between two Git commits.
#
# NOTE: This will print false positivies because llvm-diff produces
# them, even when comparing a file with itself, e.g. ``llvm-diff x x``

set -e # exit on error

usage() {
echo 1>&2 "Usage: $0 <tree-ish> <tree-ish> <clang source>..."
echo 1>&2 "Example: $0 HEAD^ HEAD trace.c"
exit 2
}

if ! which clang llvm-diff-14 > /dev/null; then
echo 1>&2 "$0: clang or llvm-diff-14 command not found"
exit 2
fi

if test "$#" -lt 2; then usage; fi
left="$1"
right="$2"
shift 2

tmpdir=$(mktemp --directory)
# shellcheck disable=SC2064
trap "rm -rf -- '$tmpdir'" EXIT
mkdir -p "$tmpdir/left" "$tmpdir/right"
git archive "$left" code | tar -x -C "$tmpdir/left"
git archive "$right" code | tar -x -C "$tmpdir/right"

status=0
while test $# -gt 0; do
file="$1"
shift
(cd "$tmpdir/left/code" &&
clang -S -emit-llvm -o "../../left.ll" "$file")
(cd "$tmpdir/right/code" &&
clang -S -emit-llvm -o "../../right.ll" "$file")
# Try to reduce false positives where the output is identical
cmp "$tmpdir/left.ll" "$tmpdir/right.ll" && continue
llvm-diff-14 "$tmpdir/left.ll" "$tmpdir/right.ll" \
> "$tmpdir/diff" 2>&1 && continue
status=1
sed -ne 's/^in function \(.*\):$/\1/p' < "$tmpdir/diff"
done
exit "$status"
295 changes: 295 additions & 0 deletions tool/git-riskiness
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# -*- mode: conf-space; -*-
# tool/git-riskiness -- estimate of risks of changing files in the MPS tree
#
# This file is used by the script tool/git-risks to assess the
# riskiness of changes made to the MPS. [Insert why it was developed,
# ref to issue, etc. RB 2023-02-24]
#
# First draft by manual inspection by RB and JPH on 2023-02-20.
#
# This file can contain blank lines and comments starting with '#'.
# See tool/git-risks.

# First column is risk to general MPS users
# Second column is risk to Configura
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