Init uninitialized member in ctor.

[chromium-blink-merge.git] / third_party / lcov / bin / geninfo

#!/usr/bin/perl -w
#
#   Copyright (c) International Business Machines  Corp., 2002,2012
#
#   This program 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 2 of the License, or (at
#   your option) any later version.
#
#   This program 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 this program;  if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# geninfo
#
#   This script generates .info files from data files as created by code
#   instrumented with gcc's built-in profiling mechanism. Call it with
#   --help and refer to the geninfo man page to get information on usage
#   and available options.
#
#
# Authors:
#   2002-08-23 created by Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com>
#                         IBM Lab Boeblingen
#        based on code by Manoj Iyer <manjo@mail.utexas.edu> and
#                         Megan Bock <mbock@us.ibm.com>
#                         IBM Austin
#   2002-09-05 / Peter Oberparleiter: implemented option that allows file list
#   2003-04-16 / Peter Oberparleiter: modified read_gcov so that it can also
#                parse the new gcov format which is to be introduced in gcc 3.3
#   2003-04-30 / Peter Oberparleiter: made info write to STDERR, not STDOUT
#   2003-07-03 / Peter Oberparleiter: added line checksum support, added
#                --no-checksum
#   2003-09-18 / Nigel Hinds: capture branch coverage data from GCOV
#   2003-12-11 / Laurent Deniel: added --follow option
#                workaround gcov (<= 3.2.x) bug with empty .da files
#   2004-01-03 / Laurent Deniel: Ignore empty .bb files
#   2004-02-16 / Andreas Krebbel: Added support for .gcno/.gcda files and
#                gcov versioning
#   2004-08-09 / Peter Oberparleiter: added configuration file support
#   2008-07-14 / Tom Zoerner: added --function-coverage command line option
#   2008-08-13 / Peter Oberparleiter: modified function coverage
#                implementation (now enabled per default)
#

use strict;
use File::Basename; 
use File::Spec::Functions qw /abs2rel catdir file_name_is_absolute splitdir
                              splitpath catpath/;
use Getopt::Long;
use Digest::MD5 qw(md5_base64);
if( $^O eq "msys" )
{
        require File::Spec::Win32;
}

# Constants
our $lcov_version       = 'LCOV version 1.10';
our $lcov_url           = "http://ltp.sourceforge.net/coverage/lcov.php";
our $gcov_tool          = "gcov";
our $tool_name          = basename($0);

our $GCOV_VERSION_4_7_0 = 0x40700;
our $GCOV_VERSION_3_4_0 = 0x30400;
our $GCOV_VERSION_3_3_0 = 0x30300;
our $GCNO_FUNCTION_TAG  = 0x01000000;
our $GCNO_LINES_TAG     = 0x01450000;
our $GCNO_FILE_MAGIC    = 0x67636e6f;
our $BBG_FILE_MAGIC     = 0x67626267;

# Error classes which users may specify to ignore during processing
our $ERROR_GCOV         = 0;
our $ERROR_SOURCE       = 1;
our $ERROR_GRAPH        = 2;
our %ERROR_ID = (
        "gcov" => $ERROR_GCOV,
        "source" => $ERROR_SOURCE,
        "graph" => $ERROR_GRAPH,
);

our $EXCL_START = "LCOV_EXCL_START";
our $EXCL_STOP = "LCOV_EXCL_STOP";
our $EXCL_LINE = "LCOV_EXCL_LINE";

# Compatibility mode values
our $COMPAT_VALUE_OFF   = 0;
our $COMPAT_VALUE_ON    = 1;
our $COMPAT_VALUE_AUTO  = 2;

# Compatibility mode value names
our %COMPAT_NAME_TO_VALUE = (
        "off"   => $COMPAT_VALUE_OFF,
        "on"    => $COMPAT_VALUE_ON,
        "auto"  => $COMPAT_VALUE_AUTO,
);

# Compatiblity modes
our $COMPAT_MODE_LIBTOOL        = 1 << 0;
our $COMPAT_MODE_HAMMER         = 1 << 1;
our $COMPAT_MODE_SPLIT_CRC      = 1 << 2;

# Compatibility mode names
our %COMPAT_NAME_TO_MODE = (
        "libtool"       => $COMPAT_MODE_LIBTOOL,
        "hammer"        => $COMPAT_MODE_HAMMER,
        "split_crc"     => $COMPAT_MODE_SPLIT_CRC,
        "android_4_4_0" => $COMPAT_MODE_SPLIT_CRC,
);

# Map modes to names
our %COMPAT_MODE_TO_NAME = (
        $COMPAT_MODE_LIBTOOL    => "libtool",
        $COMPAT_MODE_HAMMER     => "hammer",
        $COMPAT_MODE_SPLIT_CRC  => "split_crc",
);

# Compatibility mode default values
our %COMPAT_MODE_DEFAULTS = (
        $COMPAT_MODE_LIBTOOL    => $COMPAT_VALUE_ON,
        $COMPAT_MODE_HAMMER     => $COMPAT_VALUE_AUTO,
        $COMPAT_MODE_SPLIT_CRC  => $COMPAT_VALUE_AUTO,
);

# Compatibility mode auto-detection routines
sub compat_hammer_autodetect();
our %COMPAT_MODE_AUTO = (
        $COMPAT_MODE_HAMMER     => \&compat_hammer_autodetect,
        $COMPAT_MODE_SPLIT_CRC  => 1,   # will be done later
);

our $BR_LINE            = 0;
our $BR_BLOCK           = 1;
our $BR_BRANCH          = 2;
our $BR_TAKEN           = 3;
our $BR_VEC_ENTRIES     = 4;
our $BR_VEC_WIDTH       = 32;

our $UNNAMED_BLOCK      = 9999;

# Prototypes
sub print_usage(*);
sub gen_info($);
sub process_dafile($$);
sub match_filename($@);
sub solve_ambiguous_match($$$);
sub split_filename($);
sub solve_relative_path($$);
sub read_gcov_header($);
sub read_gcov_file($);
sub info(@);
sub get_gcov_version();
sub system_no_output($@);
sub read_config($);
sub apply_config($);
sub get_exclusion_data($);
sub apply_exclusion_data($$);
sub process_graphfile($$);
sub filter_fn_name($);
sub warn_handler($);
sub die_handler($);
sub graph_error($$);
sub graph_expect($);
sub graph_read(*$;$$);
sub graph_skip(*$;$);
sub sort_uniq(@);
sub sort_uniq_lex(@);
sub graph_cleanup($);
sub graph_find_base($);
sub graph_from_bb($$$);
sub graph_add_order($$$);
sub read_bb_word(*;$);
sub read_bb_value(*;$);
sub read_bb_string(*$);
sub read_bb($);
sub read_bbg_word(*;$);
sub read_bbg_value(*;$);
sub read_bbg_string(*);
sub read_bbg_lines_record(*$$$$$);
sub read_bbg($);
sub read_gcno_word(*;$$);
sub read_gcno_value(*$;$$);
sub read_gcno_string(*$);
sub read_gcno_lines_record(*$$$$$$);
sub determine_gcno_split_crc($$$);
sub read_gcno_function_record(*$$$$);
sub read_gcno($);
sub get_gcov_capabilities();
sub get_overall_line($$$$);
sub print_overall_rate($$$$$$$$$);
sub br_gvec_len($);
sub br_gvec_get($$);
sub debug($);
sub int_handler();
sub parse_ignore_errors(@);
sub is_external($);
sub compat_name($);
sub parse_compat_modes($);
sub is_compat($);
sub is_compat_auto($);


# Global variables
our $gcov_version;
our $gcov_version_string;
our $graph_file_extension;
our $data_file_extension;
our @data_directory;
our $test_name = "";
our $quiet;
our $help;
our $output_filename;
our $base_directory;
our $version;
our $follow;
our $checksum;
our $no_checksum;
our $opt_compat_libtool;
our $opt_no_compat_libtool;
our $rc_adjust_src_path;# Regexp specifying parts to remove from source path
our $adjust_src_pattern;
our $adjust_src_replace;
our $adjust_testname;
our $config;            # Configuration file contents
our @ignore_errors;     # List of errors to ignore (parameter)
our @ignore;            # List of errors to ignore (array)
our $initial;
our $no_recursion = 0;
our $maxdepth;
our $no_markers = 0;
our $opt_derive_func_data = 0;
our $opt_external = 1;
our $opt_no_external;
our $debug = 0;
our $gcov_caps;
our @gcov_options;
our @internal_dirs;
our $opt_config_file;
our $opt_gcov_all_blocks = 1;
our $opt_compat;
our %opt_rc;
our %compat_value;
our $gcno_split_crc;
our $func_coverage = 1;
our $br_coverage = 0;
our $rc_auto_base = 1;

our $cwd = `pwd`;
chomp($cwd);


#
# Code entry point
#

# Register handler routine to be called when interrupted
$SIG{"INT"} = \&int_handler;
$SIG{__WARN__} = \&warn_handler;
$SIG{__DIE__} = \&die_handler;

# Prettify version string
$lcov_version =~ s/\$\s*Revision\s*:?\s*(\S+)\s*\$/$1/;

# Set LANG so that gcov output will be in a unified format
$ENV{"LANG"} = "C";

# Check command line for a configuration file name
Getopt::Long::Configure("pass_through", "no_auto_abbrev");
GetOptions("config-file=s" => \$opt_config_file,
           "rc=s%" => \%opt_rc);
Getopt::Long::Configure("default");

# Read configuration file if available
if (defined($opt_config_file)) {
        $config = read_config($opt_config_file);
} elsif (defined($ENV{"HOME"}) && (-r $ENV{"HOME"}."/.lcovrc"))
{
        $config = read_config($ENV{"HOME"}."/.lcovrc");
}
elsif (-r "/etc/lcovrc")
{
        $config = read_config("/etc/lcovrc");
}

if ($config || %opt_rc)
{
        # Copy configuration file and --rc values to variables
        apply_config({
                "geninfo_gcov_tool"             => \$gcov_tool,
                "geninfo_adjust_testname"       => \$adjust_testname,
                "geninfo_checksum"              => \$checksum,
                "geninfo_no_checksum"           => \$no_checksum, # deprecated
                "geninfo_compat_libtool"        => \$opt_compat_libtool,
                "geninfo_external"              => \$opt_external,
                "geninfo_gcov_all_blocks"       => \$opt_gcov_all_blocks,
                "geninfo_compat"                => \$opt_compat,
                "geninfo_adjust_src_path"       => \$rc_adjust_src_path,
                "geninfo_auto_base"             => \$rc_auto_base,
                "lcov_function_coverage"        => \$func_coverage,
                "lcov_branch_coverage"          => \$br_coverage,
        });

        # Merge options
        if (defined($no_checksum))
        {
                $checksum = ($no_checksum ? 0 : 1);
                $no_checksum = undef;
        }

        # Check regexp
        if (defined($rc_adjust_src_path)) {
                my ($pattern, $replace) = split(/\s*=>\s*/,
                                                $rc_adjust_src_path);
                local $SIG{__DIE__};
                eval '$adjust_src_pattern = qr>'.$pattern.'>;';
                if (!defined($adjust_src_pattern)) {
                        my $msg = $@;

                        chomp($msg);
                        $msg =~ s/at \(eval.*$//;
                        warn("WARNING: invalid pattern in ".
                             "geninfo_adjust_src_path: $msg\n");
                } elsif (!defined($replace)) {
                        # If no replacement is specified, simply remove pattern
                        $adjust_src_replace = "";
                } else {
                        $adjust_src_replace = $replace;
                }
        }
}

# Parse command line options
if (!GetOptions("test-name|t=s" => \$test_name,
                "output-filename|o=s" => \$output_filename,
                "checksum" => \$checksum,
                "no-checksum" => \$no_checksum,
                "base-directory|b=s" => \$base_directory,
                "version|v" =>\$version,
                "quiet|q" => \$quiet,
                "help|h|?" => \$help,
                "follow|f" => \$follow,
                "compat-libtool" => \$opt_compat_libtool,
                "no-compat-libtool" => \$opt_no_compat_libtool,
                "gcov-tool=s" => \$gcov_tool,
                "ignore-errors=s" => \@ignore_errors,
                "initial|i" => \$initial,
                "no-recursion" => \$no_recursion,
                "no-markers" => \$no_markers,
                "derive-func-data" => \$opt_derive_func_data,
                "debug" => \$debug,
                "external" => \$opt_external,
                "no-external" => \$opt_no_external,
                "compat=s" => \$opt_compat,
                "config-file=s" => \$opt_config_file,
                "rc=s%" => \%opt_rc,
                ))
{
        print(STDERR "Use $tool_name --help to get usage information\n");
        exit(1);
}
else
{
        # Merge options
        if (defined($no_checksum))
        {
                $checksum = ($no_checksum ? 0 : 1);
                $no_checksum = undef;
        }

        if (defined($opt_no_compat_libtool))
        {
                $opt_compat_libtool = ($opt_no_compat_libtool ? 0 : 1);
                $opt_no_compat_libtool = undef;
        }

        if (defined($opt_no_external)) {
                $opt_external = 0;
                $opt_no_external = undef;
        }
}

@data_directory = @ARGV;

# Check for help option
if ($help)
{
        print_usage(*STDOUT);
        exit(0);
}

# Check for version option
if ($version)
{
        print("$tool_name: $lcov_version\n");
        exit(0);
}

# Check gcov tool
if (system_no_output(3, $gcov_tool, "--help") == -1)
{
        die("ERROR: need tool $gcov_tool!\n");
}

($gcov_version, $gcov_version_string) = get_gcov_version();

# Determine gcov options
$gcov_caps = get_gcov_capabilities();
push(@gcov_options, "-b") if ($gcov_caps->{'branch-probabilities'} &&
                              ($br_coverage || $func_coverage));
push(@gcov_options, "-c") if ($gcov_caps->{'branch-counts'} &&
                              $br_coverage);
push(@gcov_options, "-a") if ($gcov_caps->{'all-blocks'} &&
                              $opt_gcov_all_blocks && $br_coverage);
push(@gcov_options, "-p") if ($gcov_caps->{'preserve-paths'});

# Determine compatibility modes
parse_compat_modes($opt_compat);

# Determine which errors the user wants us to ignore
parse_ignore_errors(@ignore_errors);

# Make sure test names only contain valid characters
if ($test_name =~ s/\W/_/g)
{
        warn("WARNING: invalid characters removed from testname!\n");
}

# Adjust test name to include uname output if requested
if ($adjust_testname)
{
        $test_name .= "__".`uname -a`;
        $test_name =~ s/\W/_/g;
}

# Make sure base_directory contains an absolute path specification
if ($base_directory)
{
        $base_directory = solve_relative_path($cwd, $base_directory);
}

# Check for follow option
if ($follow)
{
        $follow = "-follow"
}
else
{
        $follow = "";
}

# Determine checksum mode
if (defined($checksum))
{
        # Normalize to boolean
        $checksum = ($checksum ? 1 : 0);
}
else
{
        # Default is off
        $checksum = 0;
}

# Determine max depth for recursion
if ($no_recursion)
{
        $maxdepth = "-maxdepth 1";
}
else
{
        $maxdepth = "";
}

# Check for directory name
if (!@data_directory)
{
        die("No directory specified\n".
            "Use $tool_name --help to get usage information\n");
}
else
{
        foreach (@data_directory)
        {
                stat($_);
                if (!-r _)
                {
                        die("ERROR: cannot read $_!\n");
                }
        }
}

if ($gcov_version < $GCOV_VERSION_3_4_0)
{
        if (is_compat($COMPAT_MODE_HAMMER))
        {
                $data_file_extension = ".da";
                $graph_file_extension = ".bbg";
        }
        else
        {
                $data_file_extension = ".da";
                $graph_file_extension = ".bb";
        }
}
else
{
        $data_file_extension = ".gcda";
        $graph_file_extension = ".gcno";
}       

# Check output filename
if (defined($output_filename) && ($output_filename ne "-"))
{
        # Initially create output filename, data is appended
        # for each data file processed
        local *DUMMY_HANDLE;
        open(DUMMY_HANDLE, ">", $output_filename)
                or die("ERROR: cannot create $output_filename!\n");
        close(DUMMY_HANDLE);

        # Make $output_filename an absolute path because we're going
        # to change directories while processing files
        if (!($output_filename =~ /^\/(.*)$/))
        {
                $output_filename = $cwd."/".$output_filename;
        }
}

# Build list of directories to identify external files
foreach my $entry(@data_directory, $base_directory) {
        next if (!defined($entry));
        push(@internal_dirs, solve_relative_path($cwd, $entry));
}

# Do something
foreach my $entry (@data_directory) {
        gen_info($entry);
}

if ($initial && $br_coverage) {
        warn("Note: --initial does not generate branch coverage ".
             "data\n");
}
info("Finished .info-file creation\n");

exit(0);



#
# print_usage(handle)
#
# Print usage information.
#

sub print_usage(*)
{
        local *HANDLE = $_[0];

        print(HANDLE <<END_OF_USAGE);
Usage: $tool_name [OPTIONS] DIRECTORY

Traverse DIRECTORY and create a .info file for each data file found. Note
that you may specify more than one directory, all of which are then processed
sequentially.

  -h, --help                        Print this help, then exit
  -v, --version                     Print version number, then exit
  -q, --quiet                       Do not print progress messages
  -i, --initial                     Capture initial zero coverage data
  -t, --test-name NAME              Use test case name NAME for resulting data
  -o, --output-filename OUTFILE     Write data only to OUTFILE
  -f, --follow                      Follow links when searching .da/.gcda files
  -b, --base-directory DIR          Use DIR as base directory for relative paths
      --(no-)checksum               Enable (disable) line checksumming
      --(no-)compat-libtool         Enable (disable) libtool compatibility mode
      --gcov-tool TOOL              Specify gcov tool location
      --ignore-errors ERROR         Continue after ERROR (gcov, source, graph)
      --no-recursion                Exclude subdirectories from processing
      --no-markers                  Ignore exclusion markers in source code
      --derive-func-data            Generate function data from line data
      --(no-)external               Include (ignore) data for external files
      --config-file FILENAME        Specify configuration file location
      --rc SETTING=VALUE            Override configuration file setting
      --compat MODE=on|off|auto     Set compat MODE (libtool, hammer, split_crc)

For more information see: $lcov_url
END_OF_USAGE
        ;
}

#
# get_common_prefix(min_dir, filenames)
#
# Return the longest path prefix shared by all filenames. MIN_DIR specifies
# the minimum number of directories that a filename may have after removing
# the prefix.
#

sub get_common_prefix($@)
{
        my ($min_dir, @files) = @_;
        my $file;
        my @prefix;
        my $i;

        foreach $file (@files) {
                my ($v, $d, $f) = splitpath($file);
                my @comp = splitdir($d);

                if (!@prefix) {
                        @prefix = @comp;
                        next;
                }
                for ($i = 0; $i < scalar(@comp) && $i < scalar(@prefix); $i++) {
                        if ($comp[$i] ne $prefix[$i] ||
                            ((scalar(@comp) - ($i + 1)) <= $min_dir)) {
                                delete(@prefix[$i..scalar(@prefix)]);
                                last;
                        }
                }
        }

        return catdir(@prefix);
}

#
# gen_info(directory)
#
# Traverse DIRECTORY and create a .info file for each data file found.
# The .info file contains TEST_NAME in the following format:
#
#   TN:<test name>
#
# For each source file name referenced in the data file, there is a section
# containing source code and coverage data:
#
#   SF:<absolute path to the source file>
#   FN:<line number of function start>,<function name> for each function
#   DA:<line number>,<execution count> for each instrumented line
#   LH:<number of lines with an execution count> greater than 0
#   LF:<number of instrumented lines>
#
# Sections are separated by:
#
#   end_of_record
#
# In addition to the main source code file there are sections for each
# #included file containing executable code. Note that the absolute path
# of a source file is generated by interpreting the contents of the respective
# graph file. Relative filenames are prefixed with the directory in which the
# graph file is found. Note also that symbolic links to the graph file will be
# resolved so that the actual file path is used instead of the path to a link.
# This approach is necessary for the mechanism to work with the /proc/gcov
# files.
#
# Die on error.
#

sub gen_info($)
{
        my $directory = $_[0];
        my @file_list;
        my $file;
        my $prefix;
        my $type;
        my $ext;

        if ($initial) {
                $type = "graph";
                $ext = $graph_file_extension;
        } else {
                $type = "data";
                $ext = $data_file_extension;
        }

        if (-d $directory)
        {
                info("Scanning $directory for $ext files ...\n");

                @file_list = `find "$directory" $maxdepth $follow -name \\*$ext -type f 2>/dev/null`;
                chomp(@file_list);
                @file_list or
                        die("ERROR: no $ext files found in $directory!\n");
                $prefix = get_common_prefix(1, @file_list);
                info("Found %d %s files in %s\n", $#file_list+1, $type,
                     $directory);
        }
        else
        {
                @file_list = ($directory);
                $prefix = "";
        }

        # Process all files in list
        foreach $file (@file_list) {
                # Process file
                if ($initial) {
                        process_graphfile($file, $prefix);
                } else {
                        process_dafile($file, $prefix);
                }
        }
}


#
# derive_data(contentdata, funcdata, bbdata)
#
# Calculate function coverage data by combining line coverage data and the
# list of lines belonging to a function.
#
# contentdata: [ instr1, count1, source1, instr2, count2, source2, ... ]
# instr<n>: Instrumentation flag for line n
# count<n>: Execution count for line n
# source<n>: Source code for line n
#
# funcdata: [ count1, func1, count2, func2, ... ]
# count<n>: Execution count for function number n
# func<n>: Function name for function number n
#
# bbdata: function_name -> [ line1, line2, ... ]
# line<n>: Line number belonging to the corresponding function
#

sub derive_data($$$)
{
        my ($contentdata, $funcdata, $bbdata) = @_;
        my @gcov_content = @{$contentdata};
        my @gcov_functions = @{$funcdata};
        my %fn_count;
        my %ln_fn;
        my $line;
        my $maxline;
        my %fn_name;
        my $fn;
        my $count;

        if (!defined($bbdata)) {
                return @gcov_functions;
        }

        # First add existing function data
        while (@gcov_functions) {
                $count = shift(@gcov_functions);
                $fn = shift(@gcov_functions);

                $fn_count{$fn} = $count;
        }

        # Convert line coverage data to function data
        foreach $fn (keys(%{$bbdata})) {
                my $line_data = $bbdata->{$fn};
                my $line;
                my $fninstr = 0;

                if ($fn eq "") {
                        next;
                }
                # Find the lowest line count for this function
                $count = 0;
                foreach $line (@$line_data) {
                        my $linstr = $gcov_content[ ( $line - 1 ) * 3 + 0 ];
                        my $lcount = $gcov_content[ ( $line - 1 ) * 3 + 1 ];

                        next if (!$linstr);
                        $fninstr = 1;
                        if (($lcount > 0) &&
                            (($count == 0) || ($lcount < $count))) {
                                $count = $lcount;
                        }
                }
                next if (!$fninstr);
                $fn_count{$fn} = $count;
        }


        # Check if we got data for all functions
        foreach $fn (keys(%fn_name)) {
                if ($fn eq "") {
                        next;
                }
                if (defined($fn_count{$fn})) {
                        next;
                }
                warn("WARNING: no derived data found for function $fn\n");
        }

        # Convert hash to list in @gcov_functions format
        foreach $fn (sort(keys(%fn_count))) {
                push(@gcov_functions, $fn_count{$fn}, $fn);
        }

        return @gcov_functions;
}

#
# get_filenames(directory, pattern)
#
# Return a list of filenames found in directory which match the specified
# pattern.
#
# Die on error.
#

sub get_filenames($$)
{
        my ($dirname, $pattern) = @_;
        my @result;
        my $directory;
        local *DIR;

        opendir(DIR, $dirname) or
                die("ERROR: cannot read directory $dirname\n");
        while ($directory = readdir(DIR)) {
                push(@result, $directory) if ($directory =~ /$pattern/);
        }
        closedir(DIR);

        return @result;
}

#
# process_dafile(da_filename, dir)
#
# Create a .info file for a single data file.
#
# Die on error.
#

sub process_dafile($$)
{
        my ($file, $dir) = @_;
        my $da_filename;        # Name of data file to process
        my $da_dir;             # Directory of data file
        my $source_dir;         # Directory of source file
        my $da_basename;        # data filename without ".da/.gcda" extension
        my $bb_filename;        # Name of respective graph file
        my $bb_basename;        # Basename of the original graph file
        my $graph;              # Contents of graph file
        my $instr;              # Contents of graph file part 2
        my $gcov_error;         # Error code of gcov tool
        my $object_dir;         # Directory containing all object files
        my $source_filename;    # Name of a source code file
        my $gcov_file;          # Name of a .gcov file
        my @gcov_content;       # Content of a .gcov file
        my $gcov_branches;      # Branch content of a .gcov file
        my @gcov_functions;     # Function calls of a .gcov file
        my @gcov_list;          # List of generated .gcov files
        my $line_number;        # Line number count
        my $lines_hit;          # Number of instrumented lines hit
        my $lines_found;        # Number of instrumented lines found
        my $funcs_hit;          # Number of instrumented functions hit
        my $funcs_found;        # Number of instrumented functions found
        my $br_hit;
        my $br_found;
        my $source;             # gcov source header information
        my $object;             # gcov object header information
        my @matches;            # List of absolute paths matching filename
        my @unprocessed;        # List of unprocessed source code files
        my $base_dir;           # Base directory for current file
        my @tmp_links;          # Temporary links to be cleaned up
        my @result;
        my $index;
        my $da_renamed;         # If data file is to be renamed
        local *INFO_HANDLE;

        info("Processing %s\n", abs2rel($file, $dir));
        # Get path to data file in absolute and normalized form (begins with /,
        # contains no more ../ or ./)
        $da_filename = solve_relative_path($cwd, $file);

        # Get directory and basename of data file
        ($da_dir, $da_basename) = split_filename($da_filename);

        $source_dir = $da_dir;
        if (is_compat($COMPAT_MODE_LIBTOOL)) {
                # Avoid files from .libs dirs    
                $source_dir =~ s/\.libs$//;
        }

        if (-z $da_filename)
        {
                $da_renamed = 1;
        }
        else
        {
                $da_renamed = 0;
        }

        # Construct base_dir for current file
        if ($base_directory)
        {
                $base_dir = $base_directory;
        }
        else
        {
                $base_dir = $source_dir;
        }

        # Check for writable $base_dir (gcov will try to write files there)
        stat($base_dir);
        if (!-w _)
        {
                die("ERROR: cannot write to directory $base_dir!\n");
        }

        # Construct name of graph file
        $bb_basename = $da_basename.$graph_file_extension;
        $bb_filename = "$da_dir/$bb_basename";

        # Find out the real location of graph file in case we're just looking at
        # a link
        while (readlink($bb_filename))
        {
                my $last_dir = dirname($bb_filename);

                $bb_filename = readlink($bb_filename);
                $bb_filename = solve_relative_path($last_dir, $bb_filename);
        }

        # Ignore empty graph file (e.g. source file with no statement)
        if (-z $bb_filename)
        {
                warn("WARNING: empty $bb_filename (skipped)\n");
                return;
        }

        # Read contents of graph file into hash. We need it later to find out
        # the absolute path to each .gcov file created as well as for
        # information about functions and their source code positions.
        if ($gcov_version < $GCOV_VERSION_3_4_0)
        {
                if (is_compat($COMPAT_MODE_HAMMER))
                {
                        ($instr, $graph) = read_bbg($bb_filename);
                }
                else
                {
                        ($instr, $graph) = read_bb($bb_filename);
                }
        } 
        else
        {
                ($instr, $graph) = read_gcno($bb_filename);
        } 

        # Try to find base directory automatically if requested by user
        if ($rc_auto_base) {
                $base_dir = find_base_from_graph($base_dir, $instr, $graph);
        }

        ($instr, $graph) = adjust_graph_filenames($base_dir, $instr, $graph);

        # Set $object_dir to real location of object files. This may differ
        # from $da_dir if the graph file is just a link to the "real" object
        # file location.
        $object_dir = dirname($bb_filename);

        # Is the data file in a different directory? (this happens e.g. with
        # the gcov-kernel patch)
        if ($object_dir ne $da_dir)
        {
                # Need to create link to data file in $object_dir
                system("ln", "-s", $da_filename, 
                       "$object_dir/$da_basename$data_file_extension")
                        and die ("ERROR: cannot create link $object_dir/".
                                 "$da_basename$data_file_extension!\n");
                push(@tmp_links,
                     "$object_dir/$da_basename$data_file_extension");
                # Need to create link to graph file if basename of link
                # and file are different (CONFIG_MODVERSION compat)
                if ((basename($bb_filename) ne $bb_basename) &&
                    (! -e "$object_dir/$bb_basename")) {
                        symlink($bb_filename, "$object_dir/$bb_basename") or
                                warn("WARNING: cannot create link ".
                                     "$object_dir/$bb_basename\n");
                        push(@tmp_links, "$object_dir/$bb_basename");
                }
        }

        # Change to directory containing data files and apply GCOV
        debug("chdir($base_dir)\n");
        chdir($base_dir);

        if ($da_renamed)
        {
                # Need to rename empty data file to workaround
                # gcov <= 3.2.x bug (Abort)
                system_no_output(3, "mv", "$da_filename", "$da_filename.ori")
                        and die ("ERROR: cannot rename $da_filename\n");
        }

        # Execute gcov command and suppress standard output
        $gcov_error = system_no_output(1, $gcov_tool, $da_filename,
                                       "-o", $object_dir, @gcov_options);

        if ($da_renamed)
        {
                system_no_output(3, "mv", "$da_filename.ori", "$da_filename")
                        and die ("ERROR: cannot rename $da_filename.ori");
        }

        # Clean up temporary links
        foreach (@tmp_links) {
                unlink($_);
        }

        if ($gcov_error)
        {
                if ($ignore[$ERROR_GCOV])
                {
                        warn("WARNING: GCOV failed for $da_filename!\n");
                        return;
                }
                die("ERROR: GCOV failed for $da_filename!\n");
        }

        # Collect data from resulting .gcov files and create .info file
        @gcov_list = get_filenames('.', '\.gcov$');

        # Check for files
        if (!@gcov_list)
        {
                warn("WARNING: gcov did not create any files for ".
                     "$da_filename!\n");
        }

        # Check whether we're writing to a single file
        if ($output_filename)
        {
                if ($output_filename eq "-")
                {
                        *INFO_HANDLE = *STDOUT;
                }
                else
                {
                        # Append to output file
                        open(INFO_HANDLE, ">>", $output_filename)
                                or die("ERROR: cannot write to ".
                                       "$output_filename!\n");
                }
        }
        else
        {
                # Open .info file for output
                open(INFO_HANDLE, ">", "$da_filename.info")
                        or die("ERROR: cannot create $da_filename.info!\n");
        }

        # Write test name
        printf(INFO_HANDLE "TN:%s\n", $test_name);

        # Traverse the list of generated .gcov files and combine them into a
        # single .info file
        @unprocessed = keys(%{$instr});
        foreach $gcov_file (sort(@gcov_list))
        {
                my $i;
                my $num;

                # Skip gcov file for gcc built-in code
                next if ($gcov_file eq "<built-in>.gcov");

                ($source, $object) = read_gcov_header($gcov_file);

                if (!defined($source)) {
                        # Derive source file name from gcov file name if
                        # header format could not be parsed
                        $source = $gcov_file;
                        $source =~ s/\.gcov$//;
                }

                $source = solve_relative_path($base_dir, $source);

                if (defined($adjust_src_pattern)) {
                        # Apply transformation as specified by user
                        $source =~ s/$adjust_src_pattern/$adjust_src_replace/g;
                }

                # gcov will happily create output even if there's no source code
                # available - this interferes with checksum creation so we need
                # to pull the emergency brake here.
                if (! -r $source && $checksum)
                {
                        if ($ignore[$ERROR_SOURCE])
                        {
                                warn("WARNING: could not read source file ".
                                     "$source\n");
                                next;
                        }
                        die("ERROR: could not read source file $source\n");
                }

                @matches = match_filename($source, keys(%{$instr}));

                # Skip files that are not mentioned in the graph file
                if (!@matches)
                {
                        warn("WARNING: cannot find an entry for ".$gcov_file.
                             " in $graph_file_extension file, skipping ".
                             "file!\n");
                        unlink($gcov_file);
                        next;
                }

                # Read in contents of gcov file
                @result = read_gcov_file($gcov_file);
                if (!defined($result[0])) {
                        warn("WARNING: skipping unreadable file ".
                             $gcov_file."\n");
                        unlink($gcov_file);
                        next;
                }
                @gcov_content = @{$result[0]};
                $gcov_branches = $result[1];
                @gcov_functions = @{$result[2]};

                # Skip empty files
                if (!@gcov_content)
                {
                        warn("WARNING: skipping empty file ".$gcov_file."\n");
                        unlink($gcov_file);
                        next;
                }

                if (scalar(@matches) == 1)
                {
                        # Just one match
                        $source_filename = $matches[0];
                }
                else
                {
                        # Try to solve the ambiguity
                        $source_filename = solve_ambiguous_match($gcov_file,
                                                \@matches, \@gcov_content);
                }

                # Remove processed file from list
                for ($index = scalar(@unprocessed) - 1; $index >= 0; $index--)
                {
                        if ($unprocessed[$index] eq $source_filename)
                        {
                                splice(@unprocessed, $index, 1);
                                last;
                        }
                }

                # Skip external files if requested
                if (!$opt_external) {
                        if (is_external($source_filename)) {
                                info("  ignoring data for external file ".
                                     "$source_filename\n");
                                unlink($gcov_file);
                                next;
                        }
                }

                # Write absolute path of source file
                printf(INFO_HANDLE "SF:%s\n", $source_filename);

                # If requested, derive function coverage data from
                # line coverage data of the first line of a function
                if ($opt_derive_func_data) {
                        @gcov_functions =
                                derive_data(\@gcov_content, \@gcov_functions,
                                            $graph->{$source_filename});
                }

                # Write function-related information
                if (defined($graph->{$source_filename}))
                {
                        my $fn_data = $graph->{$source_filename};
                        my $fn;

                        foreach $fn (sort
                                {$fn_data->{$a}->[0] <=> $fn_data->{$b}->[0]}
                                keys(%{$fn_data})) {
                                my $ln_data = $fn_data->{$fn};
                                my $line = $ln_data->[0];

                                # Skip empty function
                                if ($fn eq "") {
                                        next;
                                }
                                # Remove excluded functions
                                if (!$no_markers) {
                                        my $gfn;
                                        my $found = 0;

                                        foreach $gfn (@gcov_functions) {
                                                if ($gfn eq $fn) {
                                                        $found = 1;
                                                        last;
                                                }
                                        }
                                        if (!$found) {
                                                next;
                                        }
                                }

                                # Normalize function name
                                $fn = filter_fn_name($fn);

                                print(INFO_HANDLE "FN:$line,$fn\n");
                        }
                }

                #--
                #-- FNDA: <call-count>, <function-name>
                #-- FNF: overall count of functions
                #-- FNH: overall count of functions with non-zero call count
                #--
                $funcs_found = 0;
                $funcs_hit = 0;
                while (@gcov_functions)
                {
                        my $count = shift(@gcov_functions);
                        my $fn = shift(@gcov_functions);

                        $fn = filter_fn_name($fn);
                        printf(INFO_HANDLE "FNDA:$count,$fn\n");
                        $funcs_found++;
                        $funcs_hit++ if ($count > 0);
                }
                if ($funcs_found > 0) {
                        printf(INFO_HANDLE "FNF:%s\n", $funcs_found);
                        printf(INFO_HANDLE "FNH:%s\n", $funcs_hit);
                }

                # Write coverage information for each instrumented branch:
                #
                #   BRDA:<line number>,<block number>,<branch number>,<taken>
                #
                # where 'taken' is the number of times the branch was taken
                # or '-' if the block to which the branch belongs was never
                # executed
                $br_found = 0;
                $br_hit = 0;
                $num = br_gvec_len($gcov_branches);
                for ($i = 0; $i < $num; $i++) {
                        my ($line, $block, $branch, $taken) =
                                br_gvec_get($gcov_branches, $i);

                        print(INFO_HANDLE "BRDA:$line,$block,$branch,$taken\n");
                        $br_found++;
                        $br_hit++ if ($taken ne '-' && $taken > 0);
                }
                if ($br_found > 0) {
                        printf(INFO_HANDLE "BRF:%s\n", $br_found);
                        printf(INFO_HANDLE "BRH:%s\n", $br_hit);
                }

                # Reset line counters
                $line_number = 0;
                $lines_found = 0;
                $lines_hit = 0;

                # Write coverage information for each instrumented line
                # Note: @gcov_content contains a list of (flag, count, source)
                # tuple for each source code line
                while (@gcov_content)
                {
                        $line_number++;

                        # Check for instrumented line
                        if ($gcov_content[0])
                        {
                                $lines_found++;
                                printf(INFO_HANDLE "DA:".$line_number.",".
                                       $gcov_content[1].($checksum ?
                                       ",". md5_base64($gcov_content[2]) : "").
                                       "\n");

                                # Increase $lines_hit in case of an execution
                                # count>0
                                if ($gcov_content[1] > 0) { $lines_hit++; }
                        }

                        # Remove already processed data from array
                        splice(@gcov_content,0,3);
                }

                # Write line statistics and section separator
                printf(INFO_HANDLE "LF:%s\n", $lines_found);
                printf(INFO_HANDLE "LH:%s\n", $lines_hit);
                print(INFO_HANDLE "end_of_record\n");

                # Remove .gcov file after processing
                unlink($gcov_file);
        }

        # Check for files which show up in the graph file but were never
        # processed
        if (@unprocessed && @gcov_list)
        {
                foreach (@unprocessed)
                {
                        warn("WARNING: no data found for $_\n");
                }
        }

        if (!($output_filename && ($output_filename eq "-")))
        {
                close(INFO_HANDLE);
        }

        # Change back to initial directory
        chdir($cwd);
}


#
# solve_relative_path(path, dir)
#
# Solve relative path components of DIR which, if not absolute, resides in PATH.
#

sub solve_relative_path($$)
{
        my $path = $_[0];
        my $dir = $_[1];
        my $volume;
        my $directories;
        my $filename;
        my @dirs;                       # holds path elements
        my $result;

        # Convert from Windows path to msys path
        if( $^O eq "msys" )
        {
                # search for a windows drive letter at the beginning
                ($volume, $directories, $filename) = File::Spec::Win32->splitpath( $dir );
                if( $volume ne '' )
                {
                        my $uppercase_volume;
                        # transform c/d\../e/f\g to Windows style c\d\..\e\f\g
                        $dir = File::Spec::Win32->canonpath( $dir );
                        # use Win32 module to retrieve path components
                        # $uppercase_volume is not used any further
                        ( $uppercase_volume, $directories, $filename ) = File::Spec::Win32->splitpath( $dir );
                        @dirs = File::Spec::Win32->splitdir( $directories );
                        
                        # prepend volume, since in msys C: is always mounted to /c
                        $volume =~ s|^([a-zA-Z]+):|/\L$1\E|;
                        unshift( @dirs, $volume );
                        
                        # transform to Unix style '/' path
                        $directories = File::Spec->catdir( @dirs );
                        $dir = File::Spec->catpath( '', $directories, $filename );
                } else {
                        # eliminate '\' path separators
                        $dir = File::Spec->canonpath( $dir );
                }
        }

        $result = $dir;
        # Prepend path if not absolute
        if ($dir =~ /^[^\/]/)
        {
                $result = "$path/$result";
        }

        # Remove //
        $result =~ s/\/\//\//g;

        # Remove .
        $result =~ s/\/\.\//\//g;
        $result =~ s/\/\.$/\//g;

        # Remove trailing /
        $result =~ s/\/$//g;

        # Solve ..
        while ($result =~ s/\/[^\/]+\/\.\.\//\//)
        {
        }

        # Remove preceding ..
        $result =~ s/^\/\.\.\//\//g;

        return $result;
}


#
# match_filename(gcov_filename, list)
#
# Return a list of those entries of LIST which match the relative filename
# GCOV_FILENAME.
#

sub match_filename($@)
{
        my ($filename, @list) = @_;
        my ($vol, $dir, $file) = splitpath($filename);
        my @comp = splitdir($dir);
        my $comps = scalar(@comp);
        my $entry;
        my @result;

entry:
        foreach $entry (@list) {
                my ($evol, $edir, $efile) = splitpath($entry);
                my @ecomp;
                my $ecomps;
                my $i;

                # Filename component must match
                if ($efile ne $file) {
                        next;
                }
                # Check directory components last to first for match
                @ecomp = splitdir($edir);
                $ecomps = scalar(@ecomp);
                if ($ecomps < $comps) {
                        next;
                }
                for ($i = 0; $i < $comps; $i++) {
                        if ($comp[$comps - $i - 1] ne
                            $ecomp[$ecomps - $i - 1]) {
                                next entry;
                        }
                }
                push(@result, $entry),
        }

        return @result;
}

#
# solve_ambiguous_match(rel_filename, matches_ref, gcov_content_ref)
#
# Try to solve ambiguous matches of mapping (gcov file) -> (source code) file
# by comparing source code provided in the GCOV file with that of the files
# in MATCHES. REL_FILENAME identifies the relative filename of the gcov
# file.
# 
# Return the one real match or die if there is none.
#

sub solve_ambiguous_match($$$)
{
        my $rel_name = $_[0];
        my $matches = $_[1];
        my $content = $_[2];
        my $filename;
        my $index;
        my $no_match;
        local *SOURCE;

        # Check the list of matches
        foreach $filename (@$matches)
        {

                # Compare file contents
                open(SOURCE, "<", $filename)
                        or die("ERROR: cannot read $filename!\n");

                $no_match = 0;
                for ($index = 2; <SOURCE>; $index += 3)
                {
                        chomp;

                        # Also remove CR from line-end
                        s/\015$//;

                        if ($_ ne @$content[$index])
                        {
                                $no_match = 1;
                                last;
                        }
                }

                close(SOURCE);

                if (!$no_match)
                {
                        info("Solved source file ambiguity for $rel_name\n");
                        return $filename;
                }
        }

        die("ERROR: could not match gcov data for $rel_name!\n");
}


#
# split_filename(filename)
#
# Return (path, filename, extension) for a given FILENAME.
#

sub split_filename($)
{
        my @path_components = split('/', $_[0]);
        my @file_components = split('\.', pop(@path_components));
        my $extension = pop(@file_components);

        return (join("/",@path_components), join(".",@file_components),
                $extension);
}


#
# read_gcov_header(gcov_filename)
#
# Parse file GCOV_FILENAME and return a list containing the following
# information:
#
#   (source, object)
#
# where:
#
# source: complete relative path of the source code file (gcc >= 3.3 only)
# object: name of associated graph file
#
# Die on error.
#

sub read_gcov_header($)
{
        my $source;
        my $object;
        local *INPUT;

        if (!open(INPUT, "<", $_[0]))
        {
                if ($ignore_errors[$ERROR_GCOV])
                {
                        warn("WARNING: cannot read $_[0]!\n");
                        return (undef,undef);
                }
                die("ERROR: cannot read $_[0]!\n");
        }

        while (<INPUT>)
        {
                chomp($_);

                # Also remove CR from line-end
                s/\015$//;

                if (/^\s+-:\s+0:Source:(.*)$/)
                {
                        # Source: header entry
                        $source = $1;
                }
                elsif (/^\s+-:\s+0:Object:(.*)$/)
                {
                        # Object: header entry
                        $object = $1;
                }
                else
                {
                        last;
                }
        }

        close(INPUT);

        return ($source, $object);
}


#
# br_gvec_len(vector)
#
# Return the number of entries in the branch coverage vector.
#

sub br_gvec_len($)
{
        my ($vec) = @_;

        return 0 if (!defined($vec));
        return (length($vec) * 8 / $BR_VEC_WIDTH) / $BR_VEC_ENTRIES;
}


#
# br_gvec_get(vector, number)
#
# Return an entry from the branch coverage vector.
#

sub br_gvec_get($$)
{
        my ($vec, $num) = @_;
        my $line;
        my $block;
        my $branch;
        my $taken;
        my $offset = $num * $BR_VEC_ENTRIES;

        # Retrieve data from vector
        $line   = vec($vec, $offset + $BR_LINE, $BR_VEC_WIDTH);
        $block  = vec($vec, $offset + $BR_BLOCK, $BR_VEC_WIDTH);
        $branch = vec($vec, $offset + $BR_BRANCH, $BR_VEC_WIDTH);
        $taken  = vec($vec, $offset + $BR_TAKEN, $BR_VEC_WIDTH);

        # Decode taken value from an integer
        if ($taken == 0) {
                $taken = "-";
        } else {
                $taken--;
        }

        return ($line, $block, $branch, $taken);
}


#
# br_gvec_push(vector, line, block, branch, taken)
#
# Add an entry to the branch coverage vector.
#

sub br_gvec_push($$$$$)
{
        my ($vec, $line, $block, $branch, $taken) = @_;
        my $offset;

        $vec = "" if (!defined($vec));
        $offset = br_gvec_len($vec) * $BR_VEC_ENTRIES;

        # Encode taken value into an integer
        if ($taken eq "-") {
                $taken = 0;
        } else {
                $taken++;
        }

        # Add to vector
        vec($vec, $offset + $BR_LINE, $BR_VEC_WIDTH) = $line;
        vec($vec, $offset + $BR_BLOCK, $BR_VEC_WIDTH) = $block;
        vec($vec, $offset + $BR_BRANCH, $BR_VEC_WIDTH) = $branch;
        vec($vec, $offset + $BR_TAKEN, $BR_VEC_WIDTH) = $taken;

        return $vec;
}


#
# read_gcov_file(gcov_filename)
#
# Parse file GCOV_FILENAME (.gcov file format) and return the list:
# (reference to gcov_content, reference to gcov_branch, reference to gcov_func)
#
# gcov_content is a list of 3 elements
# (flag, count, source) for each source code line:
#
# $result[($line_number-1)*3+0] = instrumentation flag for line $line_number
# $result[($line_number-1)*3+1] = execution count for line $line_number
# $result[($line_number-1)*3+2] = source code text for line $line_number
#
# gcov_branch is a vector of 4 4-byte long elements for each branch:
# line number, block number, branch number, count + 1 or 0
#
# gcov_func is a list of 2 elements
# (number of calls, function name) for each function
#
# Die on error.
#

sub read_gcov_file($)
{
        my $filename = $_[0];
        my @result = ();
        my $branches = "";
        my @functions = ();
        my $number;
        my $exclude_flag = 0;
        my $exclude_line = 0;
        my $last_block = $UNNAMED_BLOCK;
        my $last_line = 0;
        local *INPUT;

        if (!open(INPUT, "<", $filename)) {
                if ($ignore_errors[$ERROR_GCOV])
                {
                        warn("WARNING: cannot read $filename!\n");
                        return (undef, undef, undef);
                }
                die("ERROR: cannot read $filename!\n");
        }

        if ($gcov_version < $GCOV_VERSION_3_3_0)
        {
                # Expect gcov format as used in gcc < 3.3
                while (<INPUT>)
                {
                        chomp($_);

                        # Also remove CR from line-end
                        s/\015$//;

                        if (/^branch\s+(\d+)\s+taken\s+=\s+(\d+)/) {
                                next if (!$br_coverage);
                                next if ($exclude_line);
                                $branches = br_gvec_push($branches, $last_line,
                                                $last_block, $1, $2);
                        } elsif (/^branch\s+(\d+)\s+never\s+executed/) {
                                next if (!$br_coverage);
                                next if ($exclude_line);
                                $branches = br_gvec_push($branches, $last_line,
                                                $last_block, $1, '-');
                        }
                        elsif (/^call/ || /^function/)
                        {
                                # Function call return data
                        }
                        else
                        {
                                $last_line++;
                                # Check for exclusion markers
                                if (!$no_markers) {
                                        if (/$EXCL_STOP/) {
                                                $exclude_flag = 0;
                                        } elsif (/$EXCL_START/) {
                                                $exclude_flag = 1;
                                        }
                                        if (/$EXCL_LINE/ || $exclude_flag) {
                                                $exclude_line = 1;
                                        } else {
                                                $exclude_line = 0;
                                        }
                                }
                                # Source code execution data
                                if (/^\t\t(.*)$/)
                                {
                                        # Uninstrumented line
                                        push(@result, 0);
                                        push(@result, 0);
                                        push(@result, $1);
                                        next;
                                }
                                $number = (split(" ",substr($_, 0, 16)))[0];

                                # Check for zero count which is indicated
                                # by ######
                                if ($number eq "######") { $number = 0; }

                                if ($exclude_line) {
                                        # Register uninstrumented line instead
                                        push(@result, 0);
                                        push(@result, 0);
                                } else {
                                        push(@result, 1);
                                        push(@result, $number);
                                }
                                push(@result, substr($_, 16));
                        }
                }
        }
        else
        {
                # Expect gcov format as used in gcc >= 3.3
                while (<INPUT>)
                {
                        chomp($_);

                        # Also remove CR from line-end
                        s/\015$//;

                        if (/^\s*(\d+|\$+):\s*(\d+)-block\s+(\d+)\s*$/) {
                                # Block information - used to group related
                                # branches
                                $last_line = $2;
                                $last_block = $3;
                        } elsif (/^branch\s+(\d+)\s+taken\s+(\d+)/) {
                                next if (!$br_coverage);
                                next if ($exclude_line);
                                $branches = br_gvec_push($branches, $last_line,
                                                $last_block, $1, $2);
                        } elsif (/^branch\s+(\d+)\s+never\s+executed/) {
                                next if (!$br_coverage);
                                next if ($exclude_line);
                                $branches = br_gvec_push($branches, $last_line,
                                                $last_block, $1, '-');
                        }
                        elsif (/^function\s+(.+)\s+called\s+(\d+)\s+/)
                        {
                                next if (!$func_coverage);
                                if ($exclude_line) {
                                        next;
                                }
                                push(@functions, $2, $1);
                        }
                        elsif (/^call/)
                        {
                                # Function call return data
                        }
                        elsif (/^\s*([^:]+):\s*([^:]+):(.*)$/)
                        {
                                my ($count, $line, $code) = ($1, $2, $3);

                                $last_line = $line;
                                $last_block = $UNNAMED_BLOCK;
                                # Check for exclusion markers
                                if (!$no_markers) {
                                        if (/$EXCL_STOP/) {
                                                $exclude_flag = 0;
                                        } elsif (/$EXCL_START/) {
                                                $exclude_flag = 1;
                                        }
                                        if (/$EXCL_LINE/ || $exclude_flag) {
                                                $exclude_line = 1;
                                        } else {
                                                $exclude_line = 0;
                                        }
                                }
                                # <exec count>:<line number>:<source code>
                                if ($line eq "0")
                                {
                                        # Extra data
                                }
                                elsif ($count eq "-")
                                {
                                        # Uninstrumented line
                                        push(@result, 0);
                                        push(@result, 0);
                                        push(@result, $code);
                                }
                                else
                                {
                                        if ($exclude_line) {
                                                push(@result, 0);
                                                push(@result, 0);
                                        } else {
                                                # Check for zero count
                                                if ($count eq "#####") {
                                                        $count = 0;
                                                }
                                                push(@result, 1);
                                                push(@result, $count);
                                        }
                                        push(@result, $code);
                                }
                        }
                }
        }

        close(INPUT);
        if ($exclude_flag) {
                warn("WARNING: unterminated exclusion section in $filename\n");
        }
        return(\@result, $branches, \@functions);
}


#
# Get the GCOV tool version. Return an integer number which represents the
# GCOV version. Version numbers can be compared using standard integer
# operations.
#

sub get_gcov_version()
{
        local *HANDLE;
        my $version_string;
        my $result;

        open(GCOV_PIPE, "-|", "$gcov_tool -v")
                or die("ERROR: cannot retrieve gcov version!\n");
        $version_string = <GCOV_PIPE>;
        close(GCOV_PIPE);

        $result = 0;
        if ($version_string =~ /(\d+)\.(\d+)(\.(\d+))?/)
        {
                if (defined($4))
                {
                        info("Found gcov version: $1.$2.$4\n");
                        $result = $1 << 16 | $2 << 8 | $4;
                }
                else
                {
                        info("Found gcov version: $1.$2\n");
                        $result = $1 << 16 | $2 << 8;
                }
        }
        return ($result, $version_string);
}


#
# info(printf_parameter)
#
# Use printf to write PRINTF_PARAMETER to stdout only when the $quiet flag
# is not set.
#

sub info(@)
{
        if (!$quiet)
        {
                # Print info string
                if (defined($output_filename) && ($output_filename eq "-"))
                {
                        # Don't interfere with the .info output to STDOUT
                        printf(STDERR @_);
                }
                else
                {
                        printf(@_);
                }
        }
}


#
# int_handler()
#
# Called when the script was interrupted by an INT signal (e.g. CTRl-C)
#

sub int_handler()
{
        if ($cwd) { chdir($cwd); }
        info("Aborted.\n");
        exit(1);
}


#
# system_no_output(mode, parameters)
#
# Call an external program using PARAMETERS while suppressing depending on
# the value of MODE:
#
#   MODE & 1: suppress STDOUT
#   MODE & 2: suppress STDERR
#
# Return 0 on success, non-zero otherwise.
#

sub system_no_output($@)
{
        my $mode = shift;
        my $result;
        local *OLD_STDERR;
        local *OLD_STDOUT;

        # Save old stdout and stderr handles
        ($mode & 1) && open(OLD_STDOUT, ">>&", "STDOUT");
        ($mode & 2) && open(OLD_STDERR, ">>&", "STDERR");

        # Redirect to /dev/null
        ($mode & 1) && open(STDOUT, ">", "/dev/null");
        ($mode & 2) && open(STDERR, ">", "/dev/null");
 
        debug("system(".join(' ', @_).")\n");
        system(@_);
        $result = $?;

        # Close redirected handles
        ($mode & 1) && close(STDOUT);
        ($mode & 2) && close(STDERR);

        # Restore old handles
        ($mode & 1) && open(STDOUT, ">>&", "OLD_STDOUT");
        ($mode & 2) && open(STDERR, ">>&", "OLD_STDERR");
 
        return $result;
}


#
# read_config(filename)
#
# Read configuration file FILENAME and return a reference to a hash containing
# all valid key=value pairs found.
#

sub read_config($)
{
        my $filename = $_[0];
        my %result;
        my $key;
        my $value;
        local *HANDLE;

        if (!open(HANDLE, "<", $filename))
        {
                warn("WARNING: cannot read configuration file $filename\n");
                return undef;
        }
        while (<HANDLE>)
        {
                chomp;
                # Skip comments
                s/#.*//;
                # Remove leading blanks
                s/^\s+//;
                # Remove trailing blanks
                s/\s+$//;
                next unless length;
                ($key, $value) = split(/\s*=\s*/, $_, 2);
                if (defined($key) && defined($value))
                {
                        $result{$key} = $value;
                }
                else
                {
                        warn("WARNING: malformed statement in line $. ".
                             "of configuration file $filename\n");
                }
        }
        close(HANDLE);
        return \%result;
}


#
# apply_config(REF)
#
# REF is a reference to a hash containing the following mapping:
#
#   key_string => var_ref
#
# where KEY_STRING is a keyword and VAR_REF is a reference to an associated
# variable. If the global configuration hashes CONFIG or OPT_RC contain a value
# for keyword KEY_STRING, VAR_REF will be assigned the value for that keyword. 
#

sub apply_config($)
{
        my $ref = $_[0];

        foreach (keys(%{$ref}))
        {
                if (defined($opt_rc{$_})) {
                        ${$ref->{$_}} = $opt_rc{$_};
                } elsif (defined($config->{$_})) {
                        ${$ref->{$_}} = $config->{$_};
                }
        }
}


#
# get_exclusion_data(filename)
#
# Scan specified source code file for exclusion markers and return
#   linenumber -> 1
# for all lines which should be excluded.
#

sub get_exclusion_data($)
{
        my ($filename) = @_;
        my %list;
        my $flag = 0;
        local *HANDLE;

        if (!open(HANDLE, "<", $filename)) {
                warn("WARNING: could not open $filename\n");
                return undef;
        }
        while (<HANDLE>) {
                if (/$EXCL_STOP/) {
                        $flag = 0;
                } elsif (/$EXCL_START/) {
                        $flag = 1;
                }
                if (/$EXCL_LINE/ || $flag) {
                        $list{$.} = 1;
                }
        }
        close(HANDLE);

        if ($flag) {
                warn("WARNING: unterminated exclusion section in $filename\n");
        }

        return \%list;
}


#
# apply_exclusion_data(instr, graph)
#
# Remove lines from instr and graph data structures which are marked
# for exclusion in the source code file.
#
# Return adjusted (instr, graph).
#
# graph         : file name -> function data
# function data : function name -> line data
# line data     : [ line1, line2, ... ]
#
# instr     : filename -> line data
# line data : [ line1, line2, ... ]
#

sub apply_exclusion_data($$)
{
        my ($instr, $graph) = @_;
        my $filename;
        my %excl_data;
        my $excl_read_failed = 0;

        # Collect exclusion marker data
        foreach $filename (sort_uniq_lex(keys(%{$graph}), keys(%{$instr}))) {
                my $excl = get_exclusion_data($filename);

                # Skip and note if file could not be read
                if (!defined($excl)) {
                        $excl_read_failed = 1;
                        next;
                }

                # Add to collection if there are markers
                $excl_data{$filename} = $excl if (keys(%{$excl}) > 0);
        }

        # Warn if not all source files could be read
        if ($excl_read_failed) {
                warn("WARNING: some exclusion markers may be ignored\n");
        }

        # Skip if no markers were found
        return ($instr, $graph) if (keys(%excl_data) == 0);

        # Apply exclusion marker data to graph
        foreach $filename (keys(%excl_data)) {
                my $function_data = $graph->{$filename};
                my $excl = $excl_data{$filename};
                my $function;

                next if (!defined($function_data));

                foreach $function (keys(%{$function_data})) {
                        my $line_data = $function_data->{$function};
                        my $line;
                        my @new_data;

                        # To be consistent with exclusion parser in non-initial
                        # case we need to remove a function if the first line
                        # was excluded
                        if ($excl->{$line_data->[0]}) {
                                delete($function_data->{$function});
                                next;
                        }
                        # Copy only lines which are not excluded
                        foreach $line (@{$line_data}) {
                                push(@new_data, $line) if (!$excl->{$line});
                        }

                        # Store modified list
                        if (scalar(@new_data) > 0) {
                                $function_data->{$function} = \@new_data;
                        } else {
                                # All of this function was excluded
                                delete($function_data->{$function});
                        }
                }

                # Check if all functions of this file were excluded
                if (keys(%{$function_data}) == 0) {
                        delete($graph->{$filename});
                }
        }

        # Apply exclusion marker data to instr
        foreach $filename (keys(%excl_data)) {
                my $line_data = $instr->{$filename};
                my $excl = $excl_data{$filename};
                my $line;
                my @new_data;

                next if (!defined($line_data));

                # Copy only lines which are not excluded
                foreach $line (@{$line_data}) {
                        push(@new_data, $line) if (!$excl->{$line});
                }

                # Store modified list
                $instr->{$filename} = \@new_data;
        }

        return ($instr, $graph);
}


sub process_graphfile($$)
{
        my ($file, $dir) = @_;
        my $graph_filename = $file;
        my $graph_dir;
        my $graph_basename;
        my $source_dir;
        my $base_dir;
        my $graph;
        my $instr;
        my $filename;
        local *INFO_HANDLE;

        info("Processing %s\n", abs2rel($file, $dir));

        # Get path to data file in absolute and normalized form (begins with /,
        # contains no more ../ or ./)
        $graph_filename = solve_relative_path($cwd, $graph_filename);

        # Get directory and basename of data file
        ($graph_dir, $graph_basename) = split_filename($graph_filename);

        $source_dir = $graph_dir;
        if (is_compat($COMPAT_MODE_LIBTOOL)) {
                # Avoid files from .libs dirs    
                $source_dir =~ s/\.libs$//;
        }

        # Construct base_dir for current file
        if ($base_directory)
        {
                $base_dir = $base_directory;
        }
        else
        {
                $base_dir = $source_dir;
        }

        if ($gcov_version < $GCOV_VERSION_3_4_0)
        {
                if (is_compat($COMPAT_MODE_HAMMER))
                {
                        ($instr, $graph) = read_bbg($graph_filename);
                }
                else
                {
                        ($instr, $graph) = read_bb($graph_filename);
                }
        } 
        else
        {
                ($instr, $graph) = read_gcno($graph_filename);
        }

        # Try to find base directory automatically if requested by user
        if ($rc_auto_base) {
                $base_dir = find_base_from_graph($base_dir, $instr, $graph);
        }

        ($instr, $graph) = adjust_graph_filenames($base_dir, $instr, $graph);

        if (!$no_markers) {
                # Apply exclusion marker data to graph file data
                ($instr, $graph) = apply_exclusion_data($instr, $graph);
        }

        # Check whether we're writing to a single file
        if ($output_filename)
        {
                if ($output_filename eq "-")
                {
                        *INFO_HANDLE = *STDOUT;
                }
                else
                {
                        # Append to output file
                        open(INFO_HANDLE, ">>", $output_filename)
                                or die("ERROR: cannot write to ".
                                       "$output_filename!\n");
                }
        }
        else
        {
                # Open .info file for output
                open(INFO_HANDLE, ">", "$graph_filename.info")
                        or die("ERROR: cannot create $graph_filename.info!\n");
        }

        # Write test name
        printf(INFO_HANDLE "TN:%s\n", $test_name);
        foreach $filename (sort(keys(%{$instr})))
        {
                my $funcdata = $graph->{$filename};
                my $line;
                my $linedata;

                print(INFO_HANDLE "SF:$filename\n");

                if (defined($funcdata) && $func_coverage) {
                        my @functions = sort {$funcdata->{$a}->[0] <=>
                                              $funcdata->{$b}->[0]}
                                             keys(%{$funcdata});
                        my $func;

                        # Gather list of instrumented lines and functions
                        foreach $func (@functions) {
                                $linedata = $funcdata->{$func};

                                # Print function name and starting line
                                print(INFO_HANDLE "FN:".$linedata->[0].
                                      ",".filter_fn_name($func)."\n");
                        }
                        # Print zero function coverage data
                        foreach $func (@functions) {
                                print(INFO_HANDLE "FNDA:0,".
                                      filter_fn_name($func)."\n");
                        }
                        # Print function summary
                        print(INFO_HANDLE "FNF:".scalar(@functions)."\n");
                        print(INFO_HANDLE "FNH:0\n");
                }
                # Print zero line coverage data
                foreach $line (@{$instr->{$filename}}) {
                        print(INFO_HANDLE "DA:$line,0\n");
                }
                # Print line summary
                print(INFO_HANDLE "LF:".scalar(@{$instr->{$filename}})."\n");
                print(INFO_HANDLE "LH:0\n");

                print(INFO_HANDLE "end_of_record\n");
        }
        if (!($output_filename && ($output_filename eq "-")))
        {
                close(INFO_HANDLE);
        }
}

sub filter_fn_name($)
{
        my ($fn) = @_;

        # Remove characters used internally as function name delimiters
        $fn =~ s/[,=]/_/g;

        return $fn;
}

sub warn_handler($)
{
        my ($msg) = @_;

        warn("$tool_name: $msg");
}

sub die_handler($)
{
        my ($msg) = @_;

        die("$tool_name: $msg");
}


#
# graph_error(filename, message)
#
# Print message about error in graph file. If ignore_graph_error is set, return.
# Otherwise abort.
#

sub graph_error($$)
{
        my ($filename, $msg) = @_;

        if ($ignore[$ERROR_GRAPH]) {
                warn("WARNING: $filename: $msg - skipping\n");
                return;
        }
        die("ERROR: $filename: $msg\n");
}

#
# graph_expect(description)
#
# If debug is set to a non-zero value, print the specified description of what
# is expected to be read next from the graph file.
#

sub graph_expect($)
{
        my ($msg) = @_;

        if (!$debug || !defined($msg)) {
                return;
        }

        print(STDERR "DEBUG: expecting $msg\n");
}

#
# graph_read(handle, bytes[, description, peek])
#
# Read and return the specified number of bytes from handle. Return undef
# if the number of bytes could not be read. If PEEK is non-zero, reset
# file position after read.
#

sub graph_read(*$;$$)
{
        my ($handle, $length, $desc, $peek) = @_;
        my $data;
        my $result;
        my $pos;

        graph_expect($desc);
        if ($peek) {
                $pos = tell($handle);
                if ($pos == -1) {
                        warn("Could not get current file position: $!\n");
                        return undef;
                }
        }
        $result = read($handle, $data, $length);
        if ($debug) {
                my $op = $peek ? "peek" : "read";
                my $ascii = "";
                my $hex = "";
                my $i;

                print(STDERR "DEBUG: $op($length)=$result: ");
                for ($i = 0; $i < length($data); $i++) {
                        my $c = substr($data, $i, 1);;
                        my $n = ord($c);

                        $hex .= sprintf("%02x ", $n);
                        if ($n >= 32 && $n <= 127) {
                                $ascii .= $c;
                        } else {
                                $ascii .= ".";
                        }
                }
                print(STDERR "$hex |$ascii|");
                print(STDERR "\n");
        }
        if ($peek) {
                if (!seek($handle, $pos, 0)) {
                        warn("Could not set file position: $!\n");
                        return undef;
                }
        }
        if ($result != $length) {
                return undef;
        }
        return $data;
}

#
# graph_skip(handle, bytes[, description])
#
# Read and discard the specified number of bytes from handle. Return non-zero
# if bytes could be read, zero otherwise.
#

sub graph_skip(*$;$)
{
        my ($handle, $length, $desc) = @_;

        if (defined(graph_read($handle, $length, $desc))) {
                return 1;
        }
        return 0;
}

#
# sort_uniq(list)
#
# Return list in numerically ascending order and without duplicate entries.
#

sub sort_uniq(@)
{
        my (@list) = @_;
        my %hash;

        foreach (@list) {
                $hash{$_} = 1;
        }
        return sort { $a <=> $b } keys(%hash);
}

#
# sort_uniq_lex(list)
#
# Return list in lexically ascending order and without duplicate entries.
#

sub sort_uniq_lex(@)
{
        my (@list) = @_;
        my %hash;

        foreach (@list) {
                $hash{$_} = 1;
        }
        return sort keys(%hash);
}

#
# parent_dir(dir)
#
# Return parent directory for DIR. DIR must not contain relative path
# components.
#

sub parent_dir($)
{
        my ($dir) = @_;
        my ($v, $d, $f) = splitpath($dir, 1);
        my @dirs = splitdir($d);

        pop(@dirs);

        return catpath($v, catdir(@dirs), $f);
}

#
# find_base_from_graph(base_dir, instr, graph)
#
# Try to determine the base directory of the graph file specified by INSTR
# and GRAPH. The base directory is the base for all relative filenames in
# the graph file. It is defined by the current working directory at time
# of compiling the source file.
#
# This function implements a heuristic which relies on the following
# assumptions:
# - all files used for compilation are still present at their location
# - the base directory is either BASE_DIR or one of its parent directories
# - files by the same name are not present in multiple parent directories
#

sub find_base_from_graph($$$)
{
        my ($base_dir, $instr, $graph) = @_;
        my $old_base;
        my $best_miss;
        my $best_base;
        my %rel_files;

        # Determine list of relative paths
        foreach my $filename (keys(%{$instr}), keys(%{$graph})) {
                next if (file_name_is_absolute($filename));

                $rel_files{$filename} = 1;
        }

        # Early exit if there are no relative paths
        return $base_dir if (!%rel_files);

        do {
                my $miss = 0;

                foreach my $filename (keys(%rel_files)) {
                        if (!-e solve_relative_path($base_dir, $filename)) {
                                $miss++;
                        }
                }

                debug("base_dir=$base_dir miss=$miss\n");

                # Exit if we find an exact match with no misses
                return $base_dir if ($miss == 0);

                # No exact match, aim for the one with the least source file
                # misses
                if (!defined($best_base) || $miss < $best_miss) {
                        $best_base = $base_dir;
                        $best_miss = $miss;
                }

                # Repeat until there's no more parent directory
                $old_base = $base_dir;
                $base_dir = parent_dir($base_dir);
        } while ($old_base ne $base_dir);

        return $best_base;
}

#
# adjust_graph_filenames(base_dir, instr, graph)
#
# Make relative paths in INSTR and GRAPH absolute and apply
# geninfo_adjust_src_path setting to graph file data.
#

sub adjust_graph_filenames($$$)
{
        my ($base_dir, $instr, $graph) = @_;

        foreach my $filename (keys(%{$instr})) {
                my $old_filename = $filename;

                # Convert to absolute canonical form
                $filename = solve_relative_path($base_dir, $filename);

                # Apply adjustment
                if (defined($adjust_src_pattern)) {
                        $filename =~ s/$adjust_src_pattern/$adjust_src_replace/g;
                }

                if ($filename ne $old_filename) {
                        $instr->{$filename} = delete($instr->{$old_filename});
                }
        }

        foreach my $filename (keys(%{$graph})) {
                my $old_filename = $filename;

                # Make absolute
                # Convert to absolute canonical form
                $filename = solve_relative_path($base_dir, $filename);

                # Apply adjustment
                if (defined($adjust_src_pattern)) {
                        $filename =~ s/$adjust_src_pattern/$adjust_src_replace/g;
                }

                if ($filename ne $old_filename) {
                        $graph->{$filename} = delete($graph->{$old_filename});
                }
        }

        return ($instr, $graph);
}

#
# graph_cleanup(graph)
#
# Remove entries for functions with no lines. Remove duplicate line numbers.
# Sort list of line numbers numerically ascending.
#

sub graph_cleanup($)
{
        my ($graph) = @_;
        my $filename;

        foreach $filename (keys(%{$graph})) {
                my $per_file = $graph->{$filename};
                my $function;

                foreach $function (keys(%{$per_file})) {
                        my $lines = $per_file->{$function};

                        if (scalar(@$lines) == 0) {
                                # Remove empty function
                                delete($per_file->{$function});
                                next;
                        }
                        # Normalize list
                        $per_file->{$function} = [ sort_uniq(@$lines) ];
                }
                if (scalar(keys(%{$per_file})) == 0) {
                        # Remove empty file
                        delete($graph->{$filename});
                }
        }
}

#
# graph_find_base(bb)
#
# Try to identify the filename which is the base source file for the
# specified bb data.
#

sub graph_find_base($)
{
        my ($bb) = @_;
        my %file_count;
        my $basefile;
        my $file;
        my $func;
        my $filedata;
        my $count;
        my $num;

        # Identify base name for this bb data.
        foreach $func (keys(%{$bb})) {
                $filedata = $bb->{$func};

                foreach $file (keys(%{$filedata})) {
                        $count = $file_count{$file};

                        # Count file occurrence
                        $file_count{$file} = defined($count) ? $count + 1 : 1;
                }
        }
        $count = 0;
        $num = 0;
        foreach $file (keys(%file_count)) {
                if ($file_count{$file} > $count) {
                        # The file that contains code for the most functions
                        # is likely the base file
                        $count = $file_count{$file};
                        $num = 1;
                        $basefile = $file;
                } elsif ($file_count{$file} == $count) {
                        # If more than one file could be the basefile, we
                        # don't have a basefile
                        $basefile = undef;
                }
        }

        return $basefile;
}

#
# graph_from_bb(bb, fileorder, bb_filename)
#
# Convert data from bb to the graph format and list of instrumented lines.
# Returns (instr, graph).
#
# bb         : function name -> file data
#            : undef -> file order
# file data  : filename -> line data
# line data  : [ line1, line2, ... ]
#
# file order : function name -> [ filename1, filename2, ... ]
#
# graph         : file name -> function data
# function data : function name -> line data
# line data     : [ line1, line2, ... ]
#
# instr     : filename -> line data
# line data : [ line1, line2, ... ]
#

sub graph_from_bb($$$)
{
        my ($bb, $fileorder, $bb_filename) = @_;
        my $graph = {};
        my $instr = {};
        my $basefile;
        my $file;
        my $func;
        my $filedata;
        my $linedata;
        my $order;

        $basefile = graph_find_base($bb);
        # Create graph structure
        foreach $func (keys(%{$bb})) {
                $filedata = $bb->{$func};
                $order = $fileorder->{$func};

                # Account for lines in functions
                if (defined($basefile) && defined($filedata->{$basefile})) {
                        # If the basefile contributes to this function,
                        # account this function to the basefile.
                        $graph->{$basefile}->{$func} = $filedata->{$basefile};
                } else {
                        # If the basefile does not contribute to this function,
                        # account this function to the first file contributing
                        # lines.
                        $graph->{$order->[0]}->{$func} =
                                $filedata->{$order->[0]};
                }

                foreach $file (keys(%{$filedata})) {
                        # Account for instrumented lines
                        $linedata = $filedata->{$file};
                        push(@{$instr->{$file}}, @$linedata);
                }
        }
        # Clean up array of instrumented lines
        foreach $file (keys(%{$instr})) {
                $instr->{$file} = [ sort_uniq(@{$instr->{$file}}) ];
        }

        return ($instr, $graph);
}

#
# graph_add_order(fileorder, function, filename)
#
# Add an entry for filename to the fileorder data set for function.
#

sub graph_add_order($$$)
{
        my ($fileorder, $function, $filename) = @_;
        my $item;
        my $list;

        $list = $fileorder->{$function};
        foreach $item (@$list) {
                if ($item eq $filename) {
                        return;
                }
        }
        push(@$list, $filename);
        $fileorder->{$function} = $list;
}

#
# read_bb_word(handle[, description])
#
# Read and return a word in .bb format from handle.
#

sub read_bb_word(*;$)
{
        my ($handle, $desc) = @_;

        return graph_read($handle, 4, $desc);
}

#
# read_bb_value(handle[, description])
#
# Read a word in .bb format from handle and return the word and its integer
# value.
#

sub read_bb_value(*;$)
{
        my ($handle, $desc) = @_;
        my $word;

        $word = read_bb_word($handle, $desc);
        return undef if (!defined($word));

        return ($word, unpack("V", $word));
}

#
# read_bb_string(handle, delimiter)
#
# Read and return a string in .bb format from handle up to the specified
# delimiter value.
#

sub read_bb_string(*$)
{
        my ($handle, $delimiter) = @_;
        my $word;
        my $value;
        my $string = "";

        graph_expect("string");
        do {
                ($word, $value) = read_bb_value($handle, "string or delimiter");
                return undef if (!defined($value));
                if ($value != $delimiter) {
                        $string .= $word;
                }
        } while ($value != $delimiter);
        $string =~ s/\0//g;

        return $string;
}

#
# read_bb(filename)
#
# Read the contents of the specified .bb file and return (instr, graph), where:
#
#   instr     : filename -> line data
#   line data : [ line1, line2, ... ]
#
#   graph     :     filename -> file_data
#   file_data : function name -> line_data
#   line_data : [ line1, line2, ... ]
#
# See the gcov info pages of gcc 2.95 for a description of the .bb file format.
#

sub read_bb($)
{
        my ($bb_filename) = @_;
        my $minus_one = 0x80000001;
        my $minus_two = 0x80000002;
        my $value;
        my $filename;
        my $function;
        my $bb = {};
        my $fileorder = {};
        my $instr;
        my $graph;
        local *HANDLE;

        open(HANDLE, "<", $bb_filename) or goto open_error;
        binmode(HANDLE);
        while (!eof(HANDLE)) {
                $value = read_bb_value(*HANDLE, "data word");
                goto incomplete if (!defined($value));
                if ($value == $minus_one) {
                        # Source file name
                        graph_expect("filename");
                        $filename = read_bb_string(*HANDLE, $minus_one);
                        goto incomplete if (!defined($filename));
                } elsif ($value == $minus_two) {
                        # Function name
                        graph_expect("function name");
                        $function = read_bb_string(*HANDLE, $minus_two);
                        goto incomplete if (!defined($function));
                } elsif ($value > 0) {
                        # Line number
                        if (!defined($filename) || !defined($function)) {
                                warn("WARNING: unassigned line number ".
                                     "$value\n");
                                next;
                        }
                        push(@{$bb->{$function}->{$filename}}, $value);
                        graph_add_order($fileorder, $function, $filename);
                }
        }
        close(HANDLE);
        ($instr, $graph) = graph_from_bb($bb, $fileorder, $bb_filename);
        graph_cleanup($graph);

        return ($instr, $graph);

open_error:
        graph_error($bb_filename, "could not open file");
        return undef;
incomplete:
        graph_error($bb_filename, "reached unexpected end of file");
        return undef;
}

#
# read_bbg_word(handle[, description])
#
# Read and return a word in .bbg format.
#

sub read_bbg_word(*;$)
{
        my ($handle, $desc) = @_;

        return graph_read($handle, 4, $desc);
}

#
# read_bbg_value(handle[, description])
#
# Read a word in .bbg format from handle and return its integer value.
#

sub read_bbg_value(*;$)
{
        my ($handle, $desc) = @_;
        my $word;

        $word = read_bbg_word($handle, $desc);
        return undef if (!defined($word));

        return unpack("N", $word);
}

#
# read_bbg_string(handle)
#
# Read and return a string in .bbg format.
#

sub read_bbg_string(*)
{
        my ($handle, $desc) = @_;
        my $length;
        my $string;

        graph_expect("string");
        # Read string length
        $length = read_bbg_value($handle, "string length");
        return undef if (!defined($length));
        if ($length == 0) {
                return "";
        }
        # Read string
        $string = graph_read($handle, $length, "string");
        return undef if (!defined($string));
        # Skip padding
        graph_skip($handle, 4 - $length % 4, "string padding") or return undef;

        return $string;
}

#
# read_bbg_lines_record(handle, bbg_filename, bb, fileorder, filename,
#                       function)
#
# Read a bbg format lines record from handle and add the relevant data to
# bb and fileorder. Return filename on success, undef on error.
#

sub read_bbg_lines_record(*$$$$$)
{
        my ($handle, $bbg_filename, $bb, $fileorder, $filename, $function) = @_;
        my $string;
        my $lineno;

        graph_expect("lines record");
        # Skip basic block index
        graph_skip($handle, 4, "basic block index") or return undef;
        while (1) {
                # Read line number
                $lineno = read_bbg_value($handle, "line number");
                return undef if (!defined($lineno));
                if ($lineno == 0) {
                        # Got a marker for a new filename
                        graph_expect("filename");
                        $string = read_bbg_string($handle);
                        return undef if (!defined($string));
                        # Check for end of record
                        if ($string eq "") {
                                return $filename;
                        }
                        $filename = $string;
                        if (!exists($bb->{$function}->{$filename})) {
                                $bb->{$function}->{$filename} = [];
                        }
                        next;
                }
                # Got an actual line number
                if (!defined($filename)) {
                        warn("WARNING: unassigned line number in ".
                             "$bbg_filename\n");
                        next;
                }
                push(@{$bb->{$function}->{$filename}}, $lineno);
                graph_add_order($fileorder, $function, $filename);
        }
}

#
# read_bbg(filename)
#
# Read the contents of the specified .bbg file and return the following mapping:
#   graph:     filename -> file_data
#   file_data: function name -> line_data
#   line_data: [ line1, line2, ... ]
#
# See the gcov-io.h file in the SLES 9 gcc 3.3.3 source code for a description
# of the .bbg format.
#

sub read_bbg($)
{
        my ($bbg_filename) = @_;
        my $file_magic = 0x67626267;
        my $tag_function = 0x01000000;
        my $tag_lines = 0x01450000;
        my $word;
        my $tag;
        my $length;
        my $function;
        my $filename;
        my $bb = {};
        my $fileorder = {};
        my $instr;
        my $graph;
        local *HANDLE;

        open(HANDLE, "<", $bbg_filename) or goto open_error;
        binmode(HANDLE);
        # Read magic
        $word = read_bbg_value(*HANDLE, "file magic");
        goto incomplete if (!defined($word));
        # Check magic
        if ($word != $file_magic) {
                goto magic_error;
        }
        # Skip version
        graph_skip(*HANDLE, 4, "version") or goto incomplete;
        while (!eof(HANDLE)) {
                # Read record tag
                $tag = read_bbg_value(*HANDLE, "record tag");
                goto incomplete if (!defined($tag));
                # Read record length
                $length = read_bbg_value(*HANDLE, "record length");
                goto incomplete if (!defined($tag));
                if ($tag == $tag_function) {
                        graph_expect("function record");
                        # Read function name
                        graph_expect("function name");
                        $function = read_bbg_string(*HANDLE);
                        goto incomplete if (!defined($function));
                        $filename = undef;
                        # Skip function checksum
                        graph_skip(*HANDLE, 4, "function checksum")
                                or goto incomplete;
                } elsif ($tag == $tag_lines) {
                        # Read lines record
                        $filename = read_bbg_lines_record(HANDLE, $bbg_filename,
                                          $bb, $fileorder, $filename,
                                          $function);
                        goto incomplete if (!defined($filename));
                } else {
                        # Skip record contents
                        graph_skip(*HANDLE, $length, "unhandled record")
                                or goto incomplete;
                }
        }
        close(HANDLE);
        ($instr, $graph) = graph_from_bb($bb, $fileorder, $bbg_filename);
        graph_cleanup($graph);

        return ($instr, $graph);

open_error:
        graph_error($bbg_filename, "could not open file");
        return undef;
incomplete:
        graph_error($bbg_filename, "reached unexpected end of file");
        return undef;
magic_error:
        graph_error($bbg_filename, "found unrecognized bbg file magic");
        return undef;
}

#
# read_gcno_word(handle[, description, peek])
#
# Read and return a word in .gcno format.
#

sub read_gcno_word(*;$$)
{
        my ($handle, $desc, $peek) = @_;

        return graph_read($handle, 4, $desc, $peek);
}

#
# read_gcno_value(handle, big_endian[, description, peek])
#
# Read a word in .gcno format from handle and return its integer value
# according to the specified endianness. If PEEK is non-zero, reset file
# position after read.
#

sub read_gcno_value(*$;$$)
{
        my ($handle, $big_endian, $desc, $peek) = @_;
        my $word;
        my $pos;

        $word = read_gcno_word($handle, $desc, $peek);
        return undef if (!defined($word));
        if ($big_endian) {
                return unpack("N", $word);
        } else {
                return unpack("V", $word);
        }
}

#
# read_gcno_string(handle, big_endian)
#
# Read and return a string in .gcno format.
#

sub read_gcno_string(*$)
{
        my ($handle, $big_endian) = @_;
        my $length;
        my $string;

        graph_expect("string");
        # Read string length
        $length = read_gcno_value($handle, $big_endian, "string length");
        return undef if (!defined($length));
        if ($length == 0) {
                return "";
        }
        $length *= 4;
        # Read string
        $string = graph_read($handle, $length, "string and padding");
        return undef if (!defined($string));
        $string =~ s/\0//g;

        return $string;
}

#
# read_gcno_lines_record(handle, gcno_filename, bb, fileorder, filename,
#                        function, big_endian)
#
# Read a gcno format lines record from handle and add the relevant data to
# bb and fileorder. Return filename on success, undef on error.
#

sub read_gcno_lines_record(*$$$$$$)
{
        my ($handle, $gcno_filename, $bb, $fileorder, $filename, $function,
            $big_endian) = @_;
        my $string;
        my $lineno;

        graph_expect("lines record");
        # Skip basic block index
        graph_skip($handle, 4, "basic block index") or return undef;
        while (1) {
                # Read line number
                $lineno = read_gcno_value($handle, $big_endian, "line number");
                return undef if (!defined($lineno));
                if ($lineno == 0) {
                        # Got a marker for a new filename
                        graph_expect("filename");
                        $string = read_gcno_string($handle, $big_endian);
                        return undef if (!defined($string));
                        # Check for end of record
                        if ($string eq "") {
                                return $filename;
                        }
                        $filename = $string;
                        if (!exists($bb->{$function}->{$filename})) {
                                $bb->{$function}->{$filename} = [];
                        }
                        next;
                }
                # Got an actual line number
                if (!defined($filename)) {
                        warn("WARNING: unassigned line number in ".
                             "$gcno_filename\n");
                        next;
                }
                # Add to list
                push(@{$bb->{$function}->{$filename}}, $lineno);
                graph_add_order($fileorder, $function, $filename);
        }
}

#
# determine_gcno_split_crc(handle, big_endian, rec_length)
#
# Determine if HANDLE refers to a .gcno file with a split checksum function
# record format. Return non-zero in case of split checksum format, zero
# otherwise, undef in case of read error.
#

sub determine_gcno_split_crc($$$)
{
        my ($handle, $big_endian, $rec_length) = @_;
        my $strlen;
        my $overlong_string;

        return 1 if ($gcov_version >= $GCOV_VERSION_4_7_0);
        return 1 if (is_compat($COMPAT_MODE_SPLIT_CRC));

        # Heuristic:
        # Decide format based on contents of next word in record:
        # - pre-gcc 4.7
        #   This is the function name length / 4 which should be
        #   less than the remaining record length
        # - gcc 4.7
        #   This is a checksum, likely with high-order bits set,
        #   resulting in a large number
        $strlen = read_gcno_value($handle, $big_endian, undef, 1);
        return undef if (!defined($strlen));
        $overlong_string = 1 if ($strlen * 4 >= $rec_length - 12);

        if ($overlong_string) {
                if (is_compat_auto($COMPAT_MODE_SPLIT_CRC)) {
                        info("Auto-detected compatibility mode for split ".
                             "checksum .gcno file format\n");

                        return 1;
                } else {
                        # Sanity check
                        warn("Found overlong string in function record: ".
                             "try '--compat split_crc'\n");
                }
        }

        return 0;
}

#
# read_gcno_function_record(handle, graph, big_endian, rec_length)
#
# Read a gcno format function record from handle and add the relevant data
# to graph. Return (filename, function) on success, undef on error. 
#

sub read_gcno_function_record(*$$$$)
{
        my ($handle, $bb, $fileorder, $big_endian, $rec_length) = @_;
        my $filename;
        my $function;
        my $lineno;
        my $lines;

        graph_expect("function record");
        # Skip ident and checksum
        graph_skip($handle, 8, "function ident and checksum") or return undef;
        # Determine if this is a function record with split checksums
        if (!defined($gcno_split_crc)) {
                $gcno_split_crc = determine_gcno_split_crc($handle, $big_endian,
                                                           $rec_length);
                return undef if (!defined($gcno_split_crc));
        }
        # Skip cfg checksum word in case of split checksums
        graph_skip($handle, 4, "function cfg checksum") if ($gcno_split_crc);
        # Read function name
        graph_expect("function name");
        $function = read_gcno_string($handle, $big_endian);
        return undef if (!defined($function));
        # Read filename
        graph_expect("filename");
        $filename = read_gcno_string($handle, $big_endian);
        return undef if (!defined($filename));
        # Read first line number
        $lineno = read_gcno_value($handle, $big_endian, "initial line number");
        return undef if (!defined($lineno));
        # Add to list
        push(@{$bb->{$function}->{$filename}}, $lineno);
        graph_add_order($fileorder, $function, $filename);

        return ($filename, $function);
}

#
# read_gcno(filename)
#
# Read the contents of the specified .gcno file and return the following
# mapping:
#   graph:    filename -> file_data
#   file_data: function name -> line_data
#   line_data: [ line1, line2, ... ]
#
# See the gcov-io.h file in the gcc 3.3 source code for a description of
# the .gcno format.
#

sub read_gcno($)
{
        my ($gcno_filename) = @_;
        my $file_magic = 0x67636e6f;
        my $tag_function = 0x01000000;
        my $tag_lines = 0x01450000;
        my $big_endian;
        my $word;
        my $tag;
        my $length;
        my $filename;
        my $function;
        my $bb = {};
        my $fileorder = {};
        my $instr;
        my $graph;
        local *HANDLE;

        open(HANDLE, "<", $gcno_filename) or goto open_error;
        binmode(HANDLE);
        # Read magic
        $word = read_gcno_word(*HANDLE, "file magic");
        goto incomplete if (!defined($word));
        # Determine file endianness
        if (unpack("N", $word) == $file_magic) {
                $big_endian = 1;
        } elsif (unpack("V", $word) == $file_magic) {
                $big_endian = 0;
        } else {
                goto magic_error;
        }
        # Skip version and stamp
        graph_skip(*HANDLE, 8, "version and stamp") or goto incomplete;
        while (!eof(HANDLE)) {
                my $next_pos;
                my $curr_pos;

                # Read record tag
                $tag = read_gcno_value(*HANDLE, $big_endian, "record tag");
                goto incomplete if (!defined($tag));
                # Read record length
                $length = read_gcno_value(*HANDLE, $big_endian,
                                          "record length");
                goto incomplete if (!defined($length));
                # Convert length to bytes
                $length *= 4;
                # Calculate start of next record
                $next_pos = tell(HANDLE);
                goto tell_error if ($next_pos == -1);
                $next_pos += $length;
                # Process record
                if ($tag == $tag_function) {
                        ($filename, $function) = read_gcno_function_record(
                                *HANDLE, $bb, $fileorder, $big_endian,
                                $length);
                        goto incomplete if (!defined($function));
                } elsif ($tag == $tag_lines) {
                        # Read lines record
                        $filename = read_gcno_lines_record(*HANDLE,
                                        $gcno_filename, $bb, $fileorder,
                                        $filename, $function,
                                        $big_endian);
                        goto incomplete if (!defined($filename));
                } else {
                        # Skip record contents
                        graph_skip(*HANDLE, $length, "unhandled record")
                                or goto incomplete;
                }
                # Ensure that we are at the start of the next record
                $curr_pos = tell(HANDLE);
                goto tell_error if ($curr_pos == -1);
                next if ($curr_pos == $next_pos);
                goto record_error if ($curr_pos > $next_pos);
                graph_skip(*HANDLE, $next_pos - $curr_pos,
                           "unhandled record content")
                        or goto incomplete;
        }
        close(HANDLE);
        ($instr, $graph) = graph_from_bb($bb, $fileorder, $gcno_filename);
        graph_cleanup($graph);

        return ($instr, $graph);

open_error:
        graph_error($gcno_filename, "could not open file");
        return undef;
incomplete:
        graph_error($gcno_filename, "reached unexpected end of file");
        return undef;
magic_error:
        graph_error($gcno_filename, "found unrecognized gcno file magic");
        return undef;
tell_error:
        graph_error($gcno_filename, "could not determine file position");
        return undef;
record_error:
        graph_error($gcno_filename, "found unrecognized record format");
        return undef;
}

sub debug($)
{
        my ($msg) = @_;

        return if (!$debug);
        print(STDERR "DEBUG: $msg");
}

#
# get_gcov_capabilities
#
# Determine the list of available gcov options.
#

sub get_gcov_capabilities()
{
        my $help = `$gcov_tool --help`;
        my %capabilities;

        foreach (split(/\n/, $help)) {
                next if (!/--(\S+)/);
                next if ($1 eq 'help');
                next if ($1 eq 'version');
                next if ($1 eq 'object-directory');

                $capabilities{$1} = 1;
                debug("gcov has capability '$1'\n");
        }

        return \%capabilities;
}

#
# parse_ignore_errors(@ignore_errors)
#
# Parse user input about which errors to ignore.
#

sub parse_ignore_errors(@)
{
        my (@ignore_errors) = @_;
        my @items;
        my $item;

        return if (!@ignore_errors);

        foreach $item (@ignore_errors) {
                $item =~ s/\s//g;
                if ($item =~ /,/) {
                        # Split and add comma-separated parameters
                        push(@items, split(/,/, $item));
                } else {
                        # Add single parameter
                        push(@items, $item);
                }
        }
        foreach $item (@items) {
                my $item_id = $ERROR_ID{lc($item)};

                if (!defined($item_id)) {
                        die("ERROR: unknown argument for --ignore-errors: ".
                            "$item\n");
                }
                $ignore[$item_id] = 1;
        }
}

#
# is_external(filename)
#
# Determine if a file is located outside of the specified data directories.
#

sub is_external($)
{
        my ($filename) = @_;
        my $dir;

        foreach $dir (@internal_dirs) {
                return 0 if ($filename =~ /^\Q$dir\/\E/);
        }
        return 1;
}

#
# compat_name(mode)
#
# Return the name of compatibility mode MODE.
#

sub compat_name($)
{
        my ($mode) = @_;
        my $name = $COMPAT_MODE_TO_NAME{$mode};

        return $name if (defined($name));

        return "<unknown>";
}

#
# parse_compat_modes(opt)
#
# Determine compatibility mode settings.
#

sub parse_compat_modes($)
{
        my ($opt) = @_;
        my @opt_list;
        my %specified;

        # Initialize with defaults
        %compat_value = %COMPAT_MODE_DEFAULTS;

        # Add old style specifications
        if (defined($opt_compat_libtool)) {
                $compat_value{$COMPAT_MODE_LIBTOOL} =
                        $opt_compat_libtool ? $COMPAT_VALUE_ON
                                            : $COMPAT_VALUE_OFF;
        }

        # Parse settings
        if (defined($opt)) {
                @opt_list = split(/\s*,\s*/, $opt);
        }
        foreach my $directive (@opt_list) {
                my ($mode, $value);

                # Either
                #   mode=off|on|auto or
                #   mode (implies on)
                if ($directive !~ /^(\w+)=(\w+)$/ &&
                    $directive !~ /^(\w+)$/) {
                        die("ERROR: Unknown compatibility mode specification: ".
                            "$directive!\n");
                }
                # Determine mode
                $mode = $COMPAT_NAME_TO_MODE{lc($1)};
                if (!defined($mode)) {
                        die("ERROR: Unknown compatibility mode '$1'!\n");
                }
                $specified{$mode} = 1;
                # Determine value
                if (defined($2)) {
                        $value = $COMPAT_NAME_TO_VALUE{lc($2)};
                        if (!defined($value)) {
                                die("ERROR: Unknown compatibility mode ".
                                    "value '$2'!\n");
                        }
                } else {
                        $value = $COMPAT_VALUE_ON;
                }
                $compat_value{$mode} = $value;
        }
        # Perform auto-detection
        foreach my $mode (sort(keys(%compat_value))) {
                my $value = $compat_value{$mode};
                my $is_autodetect = "";
                my $name = compat_name($mode);

                if ($value == $COMPAT_VALUE_AUTO) {
                        my $autodetect = $COMPAT_MODE_AUTO{$mode};

                        if (!defined($autodetect)) {
                                die("ERROR: No auto-detection for ".
                                    "mode '$name' available!\n");
                        }

                        if (ref($autodetect) eq "CODE") {
                                $value = &$autodetect();
                                $compat_value{$mode} = $value;
                                $is_autodetect = " (auto-detected)";
                        }
                }

                if ($specified{$mode}) {
                        if ($value == $COMPAT_VALUE_ON) {
                                info("Enabling compatibility mode ".
                                     "'$name'$is_autodetect\n");
                        } elsif ($value == $COMPAT_VALUE_OFF) {
                                info("Disabling compatibility mode ".
                                     "'$name'$is_autodetect\n");
                        } else {
                                info("Using delayed auto-detection for ".
                                     "compatibility mode ".
                                     "'$name'\n");
                        }
                }
        }
}

sub compat_hammer_autodetect()
{
        if ($gcov_version_string =~ /suse/i && $gcov_version == 0x30303 ||
            $gcov_version_string =~ /mandrake/i && $gcov_version == 0x30302)
        {
                info("Auto-detected compatibility mode for GCC 3.3 (hammer)\n");
                return $COMPAT_VALUE_ON;
        }
        return $COMPAT_VALUE_OFF;
}

#
# is_compat(mode)
#
# Return non-zero if compatibility mode MODE is enabled.
#

sub is_compat($)
{
        my ($mode) = @_;

        return 1 if ($compat_value{$mode} == $COMPAT_VALUE_ON);
        return 0;
}

#
# is_compat_auto(mode)
#
# Return non-zero if compatibility mode MODE is set to auto-detect.
#

sub is_compat_auto($)
{
        my ($mode) = @_;

        return 1 if ($compat_value{$mode} == $COMPAT_VALUE_AUTO);
        return 0;
}