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#!/usr/bin/perl
# Copyright (C) 2012-2017 Free Software Foundation, Inc.
#
# This file is part of GCC.
#
# GCC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GCC is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING. If not, write to
# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
# This script parses a .diff file generated with 'diff -up' or 'diff -cp'
# and adds a skeleton ChangeLog file to the file. It does not try to be
# very smart when parsing function names, but it produces a reasonable
# approximation.
#
# Author: Diego Novillo <dnovillo@google.com> and
# Cary Coutant <ccoutant@google.com>
use File::Temp;
use File::Copy qw(cp mv);
$date = `date +%Y-%m-%d`; chop ($date);
$dot_mklog_format_msg =
"The .mklog format is:\n"
. "NAME = ...\n"
. "EMAIL = ...\n";
# Create a .mklog to reflect your profile, if necessary.
my $conf = "$ENV{HOME}/.mklog";
if (-f "$conf") {
open (CONF, "$conf")
or die "Could not open file '$conf' for reading: $!\n";
while (<CONF>) {
if (m/^\s*NAME\s*=\s*(.*?)\s*$/) {
$name = $1;
} elsif (m/^\s*EMAIL\s*=\s*(.*?)\s*$/) {
$addr = $1;
}
}
if (!($name && $addr)) {
die "Could not read .mklog settings.\n"
. $dot_mklog_format_msg;
}
} else {
$name = `git config user.name`;
chomp($name);
$addr = `git config user.email`;
chomp($addr);
if (!($name && $addr)) {
die "Could not read git user.name and user.email settings.\n"
. "Please add missing git settings, or create a .mklog file in"
. " $ENV{HOME}.\n"
. $dot_mklog_format_msg;
}
}
$gcc_root = $0;
$gcc_root =~ s/[^\\\/]+$/../;
#-----------------------------------------------------------------------------
# Program starts here. You should not need to edit anything below this
# line.
#-----------------------------------------------------------------------------
$inline = 0;
if ($#ARGV == 1 && ("$ARGV[0]" eq "-i" || "$ARGV[0]" eq "--inline")) {
shift;
$inline = 1;
} elsif ($#ARGV != 0) {
$prog = `basename $0`; chop ($prog);
print <<EOF;
usage: $prog [ -i | --inline ] file.diff
Generate ChangeLog template for file.diff.
It assumes that patch has been created with -up or -cp.
When -i is used, the ChangeLog template is followed by the contents of
file.diff.
When file.diff is -, read standard input.
When -i is used and file.diff is not -, it writes to file.diff, otherwise it
writes to stdout.
EOF
exit 1;
}
$diff = $ARGV[0];
$dir = `dirname $diff`; chop ($dir);
$basename = `basename $diff`; chop ($basename);
$hdrline = "$date $name <$addr>";
sub get_clname ($) {
return ('ChangeLog', $_[0]) if ($_[0] !~ /[\/\\]/);
my $dirname = $_[0];
while ($dirname) {
my $clname = "$dirname/ChangeLog";
if (-f "$gcc_root/$clname" || -f "$clname") {
my $relname = substr ($_[0], length ($dirname) + 1);
return ($clname, $relname);
} else {
$dirname =~ s/[\/\\]?[^\/\\]*$//;
}
}
return ('Unknown ChangeLog', $_[0]);
}
sub remove_suffixes ($) {
my $filename = $_[0];
$filename =~ s/^[ab]\///;
$filename =~ s/\.jj$//;
return $filename;
}
sub is_context_hunk_start {
return @_[0] =~ /^\*\*\*\*\*\** ([a-zA-Z0-9_].*)/;
}
sub is_unified_hunk_start {
return @_[0] =~ /^@@ .* @@ ([a-zA-Z0-9_].*)/;
}
# Check if line is a top-level declaration.
sub is_top_level {
my ($function, $is_context_diff) = (@_);
if (is_unified_hunk_start ($function)
|| is_context_hunk_start ($function)) {
return 1;
}
if ($is_context_diff) {
$function =~ s/^..//;
} else {
$function =~ s/^.//;
}
return $function && $function !~ /^[\s{#]/;
}
# Read contents of .diff file
open (DFILE, $diff) or die "Could not open file $diff for reading";
chomp (my @diff_lines = <DFILE>);
close (DFILE);
# Array diff_lines is modified by the log generation, so save a copy in
# orig_diff_lines if needed.
if ($inline) {
@orig_diff_lines = @diff_lines;
}
# For every file in the .diff print all the function names in ChangeLog
# format.
%cl_entries = ();
$change_msg = undef;
$look_for_funs = 0;
$clname = get_clname('');
$line_idx = 0;
foreach (@diff_lines) {
# Stop processing functions if we found a new file.
# Remember both left and right names because one may be /dev/null.
# Don't be fooled by line markers in case of context diff.
if (!/\*\*\*$/ && /^[+*][+*][+*] +(\S+)/) {
$left = remove_suffixes ($1);
$look_for_funs = 0;
}
if (!/---$/ && /^--- +(\S+)?/) {
$right = remove_suffixes ($1);
$look_for_funs = 0;
}
# Check if the body of diff started.
# We should now have both left and right name,
# so we can decide filename.
if ($left && (/^\*{15}/ || /^@@ /)) {
# If we have not seen any function names in the previous file (ie,
# $change_msg is empty), we just write out a ':' before starting the next
# file.
if ($clname) {
$cl_entries{$clname} .= $change_msg ? "$change_msg" : ":\n";
}
if ($left eq $right) {
$filename = $left;
} elsif($left eq '/dev/null') {
$filename = $right;
} elsif($right eq '/dev/null') {
$filename = $left;
} else {
my @ldirs = split /[\/\\]/, $left;
my @rdirs = split /[\/\\]/, $right;
$filename = '';
while ((my $l = pop @ldirs) && (my $r = pop @rdirs)) {
last if ($l ne $r);
$filename = "$l/$filename";
}
$filename =~ s/\/$//;
if (!$filename) {
print STDERR "Error: failed to parse diff for $left and $right\n";
exit 1;
}
}
$left = $right = undef;
($clname, $relname) = get_clname ($filename);
$cl_entries{$clname} .= "\t* $relname";
$change_msg = '';
$look_for_funs = $filename =~ '\.(c|cpp|C|cc|h|inc|def)$';
}
# Context diffs have extra whitespace after first char;
# remove it to make matching easier.
if ($is_context_diff) {
s/^([-+! ]) /\1/;
}
# Remember the last line in a diff block that might start
# a new function.
if (/^[-+! ]([a-zA-Z0-9_].*)/) {
$save_fn = $1;
}
# Check if file is newly added.
# Two patterns: for context and unified diff.
if (/^\*\*\* 0 \*\*\*\*/
|| /^@@ -0,0 \+1.* @@/) {
$change_msg = $filename =~ /testsuite.*(?<!\.exp)$/ ? ": New test.\n" : ": New file.\n";
$look_for_funs = 0;
}
# Check if file was removed.
# Two patterns: for context and unified diff.
if (/^--- 0 ----/
|| /^@@ -1.* \+0,0 @@/) {
$change_msg = ": Remove.\n";
$look_for_funs = 0;
}
if (is_unified_hunk_start ($diff_lines[$line_idx])) {
$is_context_diff = 0;
}
elsif (is_context_hunk_start ($diff_lines[$line_idx])) {
$is_context_diff = 1;
}
# If we find a new function, print it in brackets. Special case if
# this is the first function in a file.
#
# Note that we don't try too hard to find good matches. This should
# return a superset of the actual set of functions in the .diff file.
#
# The first pattern works with context diff files (diff -c). The
# second pattern works with unified diff files (diff -u).
#
# The third pattern looks for the starts of functions or classes
# within a diff block both for context and unified diff files.
if ($look_for_funs
&& (/^\*\*\*\*\*\** ([a-zA-Z0-9_].*)/
|| /^@@ .* @@ ([a-zA-Z0-9_].*)/
|| /^[-+! ](\{)/))
{
$_ = $1;
my $fn;
if (/^\{/) {
# Beginning of a new function.
$_ = $save_fn;
} else {
$save_fn = "";
}
if (/;$/) {
# No usable function name found.
} elsif (/^((class|struct|union|enum) [a-zA-Z0-9_]+)/) {
# Discard stuff after the class/struct/etc. tag.
$fn = $1;
} elsif (/([a-zA-Z0-9_][^(]*)\(/) {
# Discard template and function parameters.
$fn = $1;
1 while ($fn =~ s/<[^<>]*>//);
$fn =~ s/[ \t]*$//;
}
# Check is function really modified
$no_real_change = 0;
$idx = $line_idx;
# Skip line info in context diffs.
while ($idx <= $#diff_lines && $is_context_diff
&& $diff_lines[$idx + 1] =~ /^[-\*]{3} [0-9]/) {
++$idx;
}
# Check all lines till the first change
# for the presence of really changed function
do {
++$idx;
$no_real_change = $idx > $#diff_lines
|| is_top_level ($diff_lines[$idx], $is_context_diff);
} while (!$no_real_change && ($diff_lines[$idx] !~ /^[-+!]/));
if ($fn && !$seen_names{$fn} && !$no_real_change) {
# If this is the first function in the file, we display it next
# to the filename, so we need an extra space before the opening
# brace.
if (!$change_msg) {
$change_msg .= " ";
} else {
$change_msg .= "\t";
}
$change_msg .= "($fn):\n";
$seen_names{$fn} = 1;
}
}
$line_idx++;
}
# If we have not seen any function names (ie, $change_msg is empty), we just
# write out a ':'. This happens when there is only one file with no
# functions.
$cl_entries{$clname} .= $change_msg ? "$change_msg\n" : ":\n";
if ($inline && $diff ne "-") {
# Get a temp filename, rather than an open filehandle, because we use
# the open to truncate.
$tmp = mktemp("tmp.XXXXXXXX") or die "Could not create temp file: $!";
# Copy the permissions to the temp file (in File::Copy module version
# 2.15 and later).
cp $diff, $tmp or die "Could not copy patch file to temp file: $!";
# Open the temp file, clearing contents.
open (OUTPUTFILE, '>', $tmp) or die "Could not open temp file: $!";
} else {
*OUTPUTFILE = STDOUT;
}
# Print the log
foreach my $clname (keys %cl_entries) {
print OUTPUTFILE "$clname:\n\n$hdrline\n\n$cl_entries{$clname}\n";
}
if ($inline) {
# Append the patch to the log
foreach (@orig_diff_lines) {
print OUTPUTFILE "$_\n";
}
}
if ($inline && $diff ne "-") {
# Close $tmp
close(OUTPUTFILE);
# Write new contents to $diff atomically
mv $tmp, $diff or die "Could not move temp file to patch file: $!";
}
exit 0;
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