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Text file test/errchk

Documentation: test

     1	#!/usr/bin/env perl
     2	# Copyright 2009 The Go Authors. All rights reserved.
     3	# Use of this source code is governed by a BSD-style
     4	# license that can be found in the LICENSE file.
     5	
     6	# This script checks that the compilers emit the errors which we expect.
     7	# Usage: errchk COMPILER [OPTS] SOURCEFILES.  This will run the command
     8	# COMPILER [OPTS] SOURCEFILES.  The compilation is expected to fail; if
     9	# it succeeds, this script will report an error.  The stderr output of
    10	# the compiler will be matched against comments in SOURCEFILES.  For each
    11	# line of the source files which should generate an error, there should
    12	# be a comment of the form // ERROR "regexp".  If the compiler generates
    13	# an error for a line which has no such comment, this script will report
    14	# an error.  Likewise if the compiler does not generate an error for a
    15	# line which has a comment, or if the error message does not match the
    16	# <regexp>.  The <regexp> syntax is Perl but its best to stick to egrep.
    17	
    18	use POSIX;
    19	
    20	my $exitcode = 1;
    21	
    22	if(@ARGV >= 1 && $ARGV[0] eq "-0") {
    23		$exitcode = 0;
    24		shift;
    25	}
    26	
    27	if(@ARGV < 1) {
    28		print STDERR "Usage: errchk COMPILER [OPTS] SOURCEFILES\n";
    29		exit 1;
    30	}
    31	
    32	# Grab SOURCEFILES
    33	foreach(reverse 0 .. @ARGV-1) {
    34		unless($ARGV[$_] =~ /\.(go|s)$/) {
    35			@file = @ARGV[$_+1 .. @ARGV-1];
    36			last;
    37		}
    38	}
    39	
    40	# If no files have been specified try to grab SOURCEFILES from the last
    41	# argument that is an existing directory if any
    42	unless(@file) {
    43	    foreach(reverse 0 .. @ARGV-1) {
    44	        if(-d $ARGV[$_]) {
    45	            @file = glob($ARGV[$_] . "/*.go");
    46	            last;
    47	        }
    48	    }
    49	}
    50	
    51	foreach $file (@file) {
    52		open(SRC, $file) || die "BUG: errchk: open $file: $!";
    53		$src{$file} = [<SRC>];
    54		close(SRC);
    55	}
    56	
    57	# Run command
    58	$cmd = join(' ', @ARGV);
    59	open(CMD, "exec $cmd </dev/null 2>&1 |") || die "BUG: errchk: run $cmd: $!";
    60	
    61	# gc error messages continue onto additional lines with leading tabs.
    62	# Split the output at the beginning of each line that doesn't begin with a tab.
    63	$out = join('', <CMD>);
    64	@out = split(/^(?!\t)/m, $out);
    65	
    66	close CMD;
    67	
    68	if($exitcode != 0 && $? == 0) {
    69		print STDERR "BUG: errchk: command succeeded unexpectedly\n";
    70		print STDERR @out;
    71		exit 0;
    72	}
    73	
    74	if($exitcode == 0 && $? != 0) {
    75		print STDERR "BUG: errchk: command failed unexpectedly\n";
    76		print STDERR @out;
    77		exit 0;
    78	}
    79	
    80	if(!WIFEXITED($?)) {
    81		print STDERR "BUG: errchk: compiler crashed\n";
    82		print STDERR @out, "\n";
    83		exit 0;
    84	}
    85	
    86	sub bug() {
    87		if(!$bug++) {
    88			print STDERR "BUG: ";
    89		}
    90	}
    91	
    92	sub chk {
    93		my $file = shift;
    94		my $line = 0;
    95		my $regexp;
    96		my @errmsg;
    97		my @match;
    98		foreach my $src (@{$src{$file}}) {
    99			$line++;
   100			next if $src =~ m|////|;  # double comment disables ERROR
   101			next unless $src =~ m|// (GC_)?ERROR (.*)|;
   102			my $all = $2;
   103			if($all !~ /^"([^"]*)"/) {
   104				print STDERR "$file:$line: malformed regexp\n";
   105				next;
   106			}
   107			@errmsg = grep { /$file:$line[:[]/ } @out;
   108			@out = grep { !/$file:$line[:[]/ } @out;
   109			if(@errmsg == 0) {
   110				bug();
   111				print STDERR "errchk: $file:$line: missing expected error: '$all'\n";
   112				next;
   113			}
   114			foreach my $regexp ($all =~ /"([^"]*)"/g) {
   115				# Turn relative line number in message into absolute line number.
   116				if($regexp =~ /LINE(([+-])([0-9]+))?/) {
   117					my $n = $line;
   118					if(defined($1)) {
   119						if($2 eq "+") {
   120							$n += int($3);
   121						} else {
   122							$n -= int($3);
   123						}
   124					}
   125					$regexp = "$`$file:$n$'";
   126				}
   127		
   128				@match = grep { /$regexp/ } @errmsg;
   129				if(@match == 0) {
   130					bug();
   131					print STDERR "errchk: $file:$line: error messages do not match '$regexp'\n";
   132					next;
   133				}
   134				@errmsg = grep { !/$regexp/ } @errmsg;
   135			}
   136			if(@errmsg != 0) {
   137				bug();
   138				print STDERR "errchk: $file:$line: unmatched error messages:\n";
   139				foreach my $l (@errmsg) {
   140					print STDERR "> $l";
   141				}
   142			}
   143		}
   144	}
   145	
   146	foreach $file (@file) {
   147		chk($file)
   148	}
   149	
   150	if(@out != 0) {
   151		bug();
   152		print STDERR "errchk: unmatched error messages:\n";
   153		print STDERR "==================================================\n";
   154		print STDERR @out;
   155		print STDERR "==================================================\n";
   156	}
   157	
   158	exit 0;

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