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# Copyright (C) 2001, 2004, 2005, 2007, 2008, 2010, 2011
# Free Software Foundation, Inc.

# 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 3 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 GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.
#
# This script was submitted by Janis Johnson <janis187@us.ibm.com>.

# Test the functionality and optionally, performance improvement, of
# programs compiled with profile-directed optimizations.  Compile and
# run a test with profile options, compile it with options using the
# profile feedback, and then run the test again.  Optionally compile
# and run a third time without the profile-directed optimization and
# compare timing results of the program with normal optimization and
# with the profile-directed optimization. Each test is run using
# multiple sets of optimization and/or code generation options in
# addition to the profiling and feedback options.

# If perf_ext is defined and the performance value for the
# profile-directed test run is nonzero then the performance check will
# be done.

load_lib dg.exp
load_lib gcc-dg.exp

global PROFOPT_OPTIONS perf_delta

# The including .exp file must define these.
global tool profile_option feedback_option prof_ext
if ![info exists tool] {
    error "Tools is not specified."
}
if ![info exists prof_ext] {
    error "No profile data file extensions specified."
}

# The maximum perforance degradation can be defined in the including file.
if ![info exists perf_delta] {
    set perf_delta 4
}

# The default option list can be overridden by
# PROFOPT_OPTIONS="{ { list1 } ... { list2 } }"

if ![info exists PROFOPT_OPTIONS] {
    set PROFOPT_OPTIONS [list \
        { -g } \
        { -O0 } \
        { -O1 } \
        { -O2 } \
        { -O3 } \
        { -O3 -g } \
        { -Os } ]
}

set prof_option_list $PROFOPT_OPTIONS

#
# profopt-cleanup -- remove profiling or performance results files.
#
# TESTCASE is the name of the test
# EXT is the extensions of files to remove
#
proc profopt-cleanup { testcase extlist } {
    set basename [file tail $testcase]
    set base [file rootname $basename]
    foreach ext $extlist {
        set files [glob -nocomplain $base.$ext]
        if { $files != "" } {
            eval "remote_file build delete $files"
        }
    }
}

#
# profopt-perf-value -- get performance value for a test
#
# TESTCASE is the name of the test
# PERF_EXT is the extension of the performance result file
# OPTSTR is the string of compiler options
#
proc profopt-perf-value { testcase perf_ext optstr } {
    set basename [file tail $testcase]
    set base [file rootname $basename]
    set files [glob -nocomplain $base.$perf_ext]
    # The file doesn't exist; let the caller decide if that's a problem.
    if { $files == "" } {
        return -2 
    }
    remote_upload host $base.$perf_ext $base.$perf_ext
    set fd [open $base.$perf_ext r]
    gets $fd line
    set val -2
    if [regexp "TIME" $line] {
        if [regexp "TIME -1" $line] {
            fail "$testcase perf check: no consistent time available, $optstr"
            set val -1
        } elseif ![regexp "(\[0-9\]+)" "$line" val] {
            set val -2
        }
    }
    # Report problems with an existing file.
    if { $val == -2 } {
        fail "$testcase perf check: file $base.$perf_ext has wrong format, $optstr"
    }
    close $fd
    profopt-cleanup $testcase $perf_ext
    return $val
}

#
# dg-final-generate -- process code to run after the profile-generate step
#
# ARGS is the line number of the directive followed by the commands.
#
proc dg-final-generate { args } {
    global generate_final_code

    if { [llength $args] > 2 } {
        error "[lindex $args 0]: too many arguments"
        return
    }
    append generate_final_code "[lindex $args 1]\n"
}

#
# dg-final-use -- process code to run after the profile-use step
#
# ARGS is the line number of the directive followed by the commands.
#
proc dg-final-use { args } {
    global use_final_code

    if { [llength $args] > 2 } {
        error "[lindex $args 0]: too many arguments"
        return
    }
    append use_final_code "[lindex $args 1]\n"
}

#
# profopt-final-code -- run final code
#
# WHICH is "generate" or "use".
# FINAL_CODE is the TCL code to run.
# TESTCASE is the name of the test, for error messages.
#
proc profopt-final-code { which final_code name } {
    # This is copied from dg-test in dg.exp of DejaGnu.
    regsub -all "\\\\(\[{}\])" $final_code "\\1" final_code
    proc profopt-final-proc { args } $final_code
    if [catch "profopt-final-proc $name" errmsg] {
        perror "$name: error executing dg-final-${which}: $errmsg"
        unresolved "$name: Error executing dg-final-${which}: $errmsg"
    }
}

#
# profopt-get-options -- process test directives
#
# SRC is the full pathname of the testcase.
#
proc profopt-get-options { src } {
    # dg-options sets a variable called dg-extra-tool-flags.
    set dg-extra-tool-flags ""

    # dg-require-* sets dg-do-what.
    upvar dg-do-what dg-do-what 

    # current_compiler_flags reads tool_flags from the same stack frame
    # as dg-extra-tool-flags
    set tool_flags ""

    set tmp [dg-get-options $src]
    foreach op $tmp {
        set cmd [lindex $op 0]
        if { ![string compare "dg-options" $cmd] \
             || ![string compare "dg-skip-if" $cmd] \
             || ![string compare "dg-final-generate" $cmd] \
             || ![string compare "dg-final-use" $cmd] \
             || ![string compare "dg-additional-sources" $cmd] \
             || [string match "dg-require-*" $cmd]  } {
            set status [catch "$op" errmsg]
            if { $status != 0 } {
                perror "$src: $errmsg for \"$op\"\n"
                unresolved "$src: $errmsg for \"$op\""
                return
            }
        } else {
            # Ignore unrecognized dg- commands, but warn about them.
            warning "profopt.exp does not support $cmd"
        }
    }

    # Return flags to use for compiling the primary source file and for
    # linking.
    return ${dg-extra-tool-flags}
}

#
# c-prof-execute -- compile for profiling and then feedback, then normal
#
# SRC is the full pathname of the testcase.
#
proc profopt-execute { src } {
    global srcdir tmpdir
    global prof_option_list
    global tool profile_option feedback_option prof_ext perf_ext perf_delta
    global generate_final_code use_final_code
    global verbose

    if ![info exists profile_option] {
        error "No profile option specified for first compile."
    }
    if ![info exists feedback_option] {
        error "No feedback option specified for second compile."
    }

    regsub "(?q)$srcdir/" $src "" testcase
    # If we couldn't rip $srcdir out of `src' then just do the best we can.
    # The point is to reduce the unnecessary noise in the logs.  Don't strip
    # out too much because different testcases with the same name can confuse
    # `test-tool'.
    if [string match "/*" $testcase] {
        set testcase "[file tail [file dirname $src]]/[file tail $src]"
    }

    set executable $tmpdir/[file tail [file rootname $src].x]
    set basename [file tail $testcase]
    set base [file rootname $basename]

    set count 0
    foreach option $prof_option_list {
        set execname1 "${executable}${count}1"
        set execname2 "${executable}${count}2"
        set execname3 "${executable}${count}3"
        incr count

        remote_file build delete $execname1
        remote_file build delete $execname2
        remote_file build delete $execname3
        verbose "Testing $testcase, $option" 1

        # Remove old profiling and performance data files.
        foreach ext $prof_ext {
            remote_file target delete $tmpdir/$base.$ext
        }
        if [info exists perf_ext] {
            profopt-cleanup $testcase $perf_ext
        }

        # Process test directives.

        set generate_final_code ""
        set use_final_code ""
        set dg-do-what [list "run" "" P]
        set extra_flags [profopt-get-options $src]
        if { [lindex ${dg-do-what} 1 ] == "N" } {
            unsupported "$src"
            verbose "$src not supported on this target, skipping it" 3
            return
        }

        set extra_options [dg-additional-files-options "" "$src"]

        # Tree profiling requires TLS runtime support, which may need
        # additional flags.
        if { [string first "-fprofile-generate" $profile_option] >= 0 } {
            set extra_flags [add_options_for_tls $extra_flags]
        }

        # Compile for profiling.

        set options "$extra_options"
        lappend options "additional_flags=$option $extra_flags $profile_option"
        set optstr "$option $profile_option"
        set comp_output [${tool}_target_compile "$src" "$execname1" executable $options]
        if ![${tool}_check_compile "$testcase compilation" $optstr $execname1 $comp_output] {
            unresolved "$testcase execution,   $optstr"
            unresolved "$testcase compilation, $option $feedback_option"
            unresolved "$testcase execution,   $option $feedback_option"
            continue
        }

        # Run the profiled test.

        set result [${tool}_load $execname1 "" ""]
        set status [lindex $result 0]
        set missing_file 0
        # Make sure the profile data was generated, and fail if not.
        if { $status == "pass" } {
            foreach ext $prof_ext {
                remote_upload target $tmpdir/$base.$ext
                set files [glob -nocomplain $base.$ext]
                if { $files == "" } {
                    set status "fail"
                    set missing_file 1
                    fail "$testcase execution: file $base.$ext does not exist, $option $profile_option"
                }
            }
        }
        if { $missing_file == 0 } {
            $status "$testcase execution,   $optstr"
        }

        # If there is dg-final code to execute for the generate step, do it
        # even if it failed; it might clean up temporary files.
        if ![string match $generate_final_code ""] {
            profopt-final-code "generate" $generate_final_code $testcase
        }

        remote_file build delete $execname1

        # Quit for this round if it failed
        if { $status != "pass" } {
            unresolved "$testcase compilation, $option $feedback_option"
            unresolved "$testcase execution,   $option $feedback_option"
            continue
        }

        # Compile with feedback-directed optimizations.

        set options "$extra_options"
        lappend options "additional_flags=$option $extra_flags $feedback_option"
        set optstr "$option $feedback_option"
        set comp_output [${tool}_target_compile "$src" "$execname2" "executable" $options]

        # Prune warnings we know are unwanted.
        set comp_output [prune_warnings $comp_output]

        if ![${tool}_check_compile "$testcase compilation" $optstr $execname2 $comp_output] {
            unresolved "$testcase execution,   $optstr"
            continue
        }

        # Run the profile-directed optimized test.

        set result [${tool}_load "$execname2" "" ""]
        set status [lindex $result 0]
        $status "$testcase execution,   $optstr"

        # If there is dg-final code to execute for the use step, do it.
        if ![string match $use_final_code ""] {
            profopt-final-code "use" $use_final_code $testcase
        }

        # Remove the profiling data files.
        foreach ext $prof_ext {
            remote_file target delete $tmpdir/$base.$ext
        }

        if { $status != "pass" } {
            continue
        }

        # If the test is not expected to produce performance data then
        # we're done now.
        if ![info exists perf_ext] {
            remote_file build delete $execname2
            continue
        }

        # Get the performance data from the test built with
        # profile-directed optimization.  If the file doesn't exist or if
        # the value is zero, skip the performance comparison.
        set val2 [profopt-perf-value $testcase $perf_ext $optstr]
        if { $val2 <= 0 } {
            remote_file build delete $execname2
            continue
        }

        # Compile with normal optimizations.

        set options "$extra_options"
        lappend options "additional_flags=$option"
        set optstr "$option"
        set comp_output [${tool}_target_compile "$src" "$execname3" "executable" $options]
        if ![${tool}_check_compile "$testcase compilation" $optstr $execname3 $comp_output] {
            unresolved "$testcase execution,   $optstr"
            unresolved "$testcase perf check,  $optstr"
            continue
        }

        # Run the test with normal optimizations.

        set result [${tool}_load "$execname3" "" ""]
        set status [lindex $result 0]
        $status "$testcase execution,   $optstr"
        if { $status != "pass" } {
            unresolved "$testcase perf check, $optstr"
            continue
        }

        # Get the performance data from the test built with normal
        # optimization.
        set val1 [profopt-perf-value $testcase $perf_ext $optstr]
        if { $val1 < 0 } {
            if { $val1 == -2 } {
                # The data file existed with the profile-directed
                # optimization so this one should, too.
                fail "$testcase perf check: file $base.$perf_ext does not exist, $optstr"
            }
            continue
        }

        # Compare results of the two runs and fail if the time with the
        # profile-directed optimization is significantly more than the time
        # without it.
        set status "pass"
        if { $val2 > $val1 } {
            # Check for a performance degration outside of allowable limits.
            if { [expr $val2 - $val1] > [expr [expr $val1 * $perf_delta] / 100] } {
                set status "fail"
            }
        }
        if { $status == "fail" } {
            fail "$testcase perf check: orig: $val1  new: $val2, $optstr"
        } else {
            $status "$testcase perf check,  $optstr"
            verbose "$testcase orig: $val1  new: $val2, $optstr" 2
            remote_file build delete $execname2
            remote_file build delete $execname3
        }
    }
}