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#!/usr/bin/perl
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# This script checks that the compilers emit the errors which we expect.
# Usage: errchk COMPILER [OPTS] SOURCEFILES.  This will run the command
# COMPILER [OPTS] SOURCEFILES.  The compilation is expected to fail; if
# it succeeds, this script will report an error.  The stderr output of
# the compiler will be matched against comments in SOURCEFILES.  For each
# line of the source files which should generate an error, there should
# be a comment of the form // ERROR "regexp".  If the compiler generates
# an error for a line which has no such comment, this script will report
# an error.  Likewise if the compiler does not generate an error for a
# line which has a comment, or if the error message does not match the
# <regexp>.  The <regexp> syntax is Perl but its best to stick to egrep.

use POSIX;

my $exitcode = 1;

if(@ARGV >= 1 && $ARGV[0] eq "-0") {
        $exitcode = 0;
        shift;
}

if(@ARGV < 1) {
        print STDERR "Usage: errchk COMPILER [OPTS] SOURCEFILES\n";
        exit 1;
}

# Grab SOURCEFILES
foreach(reverse 0 .. @ARGV-1) {
        unless($ARGV[$_] =~ /\.go$/) {
                @file = @ARGV[$_+1 .. @ARGV-1];
                last;
        }
}

foreach $file (@file) {
        open(SRC, $file) || die "BUG: errchk: open $file: $!";
        $src{$file} = [<SRC>];
        close(SRC);
}

# Run command
$cmd = join(' ', @ARGV);
open(CMD, "exec $cmd </dev/null 2>&1 |") || die "BUG: errchk: run $cmd: $!";

# 6g error messages continue onto additional lines with leading tabs.
# Split the output at the beginning of each line that doesn't begin with a tab.
$out = join('', <CMD>);
@out = split(/^(?!\t)/m, $out);

close CMD;

if($exitcode != 0 && $? == 0) {
        print STDERR "BUG: errchk: command succeeded unexpectedly\n";
        print STDERR @out;
        exit 0;
}

if($exitcode == 0 && $? != 0) {
        print STDERR "BUG: errchk: command failed unexpectedly\n";
        print STDERR @out;
        exit 0;
}

if(!WIFEXITED($?)) {
        print STDERR "BUG: errchk: compiler crashed\n";
        print STDERR @out, "\n";
        exit 0;
}

sub bug() {
        if(!$bug++) {
                print STDERR "BUG: ";
        }
}

sub chk {
        my $file = shift;
        my $line = 0;
        my $regexp;
        my @errmsg;
        my @match;
        foreach my $src (@{$src{$file}}) {
                $line++;
                next if $src =~ m|////|;  # double comment disables ERROR
                next unless $src =~ m|// (GC_)?ERROR (.*)|;
                my $all = $2;
                if($all !~ /^"([^"]*)"/) {
                        print STDERR "$file:$line: malformed regexp\n";
                        next;
                }
                @errmsg = grep { /$file:$line[:[]/ } @out;
                @out = grep { !/$file:$line[:[]/ } @out;
                if(@errmsg == 0) {
                        bug();
                        print STDERR "errchk: $file:$line: missing expected error: '$all'\n";
                        next;
                }
                foreach my $regexp ($all =~ /"([^"]*)"/g) {
                        # Turn relative line number in message into absolute line number.
                        if($regexp =~ /LINE(([+-])([0-9]+))?/) {
                                my $n = $line;
                                if(defined($1)) {
                                        if($2 eq "+") {
                                                $n += int($3);
                                        } else {
                                                $n -= int($3);
                                        }
                                }
                                $regexp = "$`$file:$n$'";
                        }
        
                        @match = grep { /$regexp/ } @errmsg;
                        if(@match == 0) {
                                bug();
                                print STDERR "errchk: $file:$line: error messages do not match '$regexp'\n";
                                next;
                        }
                        @errmsg = grep { !/$regexp/ } @errmsg;
                }
                if(@errmsg != 0) {
                        bug();
                        print STDERR "errchk: $file:$line: unmatched error messages:\n";
                        foreach my $l (@errmsg) {
                                print STDERR "> $l";
                        }
                }
        }
}

foreach $file (@file) {
        chk($file)
}

if(@out != 0) {
        bug();
        print STDERR "errchk: unmatched error messages:\n";
        print STDERR "==================================================\n";
        print STDERR @out;
        print STDERR "==================================================\n";
}

exit 0;