#   Copyright (C) 2009-2016 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/>.

global gdb_tests
set gdb_tests {}

# Scan a file for markers and fill in the gdb_marker array for that
# file.  Any error in this script is simply thrown; errors here are
# programming errors in the test suite itself and should not be
# caught.
proc scan_gdb_markers {filename} {
    global gdb_markers

    if {[info exists gdb_markers($filename,-)]} {
	return
    }

    set fd [open $filename]
    set lineno 1
    while {! [eof $fd]} {
	set line [gets $fd]
	if {[regexp -- "Mark (\[a-zA-Z0-9\]+)" $line ignore marker]} {
	    set gdb_markers($filename,$marker) $lineno
	}
	incr lineno
    }
    close $fd

    set gdb_markers($filename,-) {}
}

# Find a marker in a source file, and return the marker's line number.
proc get_line_number {filename marker} {
    global gdb_markers

    scan_gdb_markers $filename
    return $gdb_markers($filename,$marker)
}

# Make note of a gdb test.  A test consists of a variable name and an
# expected result.
proc note-test {var result} {
    global gdb_tests

    lappend gdb_tests $var $result 0
}

# A test that uses a regular expression.  This is like note-test, but
# the result is a regular expression that is matched against the
# output.
proc regexp-test {var result} {
    global gdb_tests

    lappend gdb_tests $var $result 1
}

# A test of 'whatis'.  This tests a type rather than a variable.
proc whatis-test {var result} {
    global gdb_tests

    lappend gdb_tests $var $result whatis
}

# Utility for testing variable values using gdb, invoked via dg-final.
# Tests all tests indicated by note-test and regexp-test.
#
# Argument 0 is the marker on which to put a breakpoint
# Argument 2 handles expected failures and the like
proc gdb-test { marker {selector {}} {load_xmethods 0} } {
    if { ![isnative] || [is_remote target] } { return }

    if {[string length $selector] > 0} {
	switch [dg-process-target $selector] {
	    "S" { }
	    "N" { return }
	    "F" { setup_xfail "*-*-*" }
	    "P" { }
	}
    }

    set do_whatis_tests [gdb_batch_check "python print(gdb.type_printers)" \
			   "\\\[\\\]"]
    if {!$do_whatis_tests} {
	send_log "skipping 'whatis' tests - gdb too old"
    }

    # This assumes that we are three frames down from dg-test, and that
    # it still stores the filename of the testcase in a local variable "name".
    # A cleaner solution would require a new DejaGnu release.
    upvar 2 name testcase
    upvar 2 prog prog

    set line [get_line_number $prog $marker]

    set gdb_name $::env(GUALITY_GDB_NAME)
    set testname "$testcase"
    set output_file "[file rootname [file tail $prog]].exe"
    set cmd_file "[file rootname [file tail $prog]].gdb"

    global srcdir
    set printer_code [file join $srcdir .. python libstdcxx v6 printers.py]
    set xmethod_code [file join $srcdir .. python libstdcxx v6 xmethods.py]

    global gdb_tests

    set fd [open $cmd_file "w"]
    # We don't want the system copy of the pretty-printers loaded
    puts $fd "set auto-load no"
    # Now that we've disabled auto-load, it's safe to set the target file
    puts $fd "file ./$output_file"
    # Load & register *our* copy of the pretty-printers
    puts $fd "source $printer_code"
    puts $fd "python register_libstdcxx_printers(None)"
    if { $load_xmethods } {
	# Load a& register xmethods.
	puts $fd "source $xmethod_code"
	puts $fd "python register_libstdcxx_xmethods(None)"
    }
    # And start the program
    puts $fd "break $line"
    puts $fd "run"
    # So we can verify that we're using the right libs ...
    puts $fd "info share"

    set count 0
    foreach {var result kind} $gdb_tests {
	incr count
	set gdb_var($count) $var
	set gdb_expected($count) $result
	if {$kind == "whatis"} {
	    if {$do_whatis_tests} {
		set gdb_is_type($count) 1
		set gdb_command($count) "whatis $var"
	    } else {
	        unsupported "$testname"
	        close $fd
	        return
	    }
	} else {
	    set gdb_is_type($count) 0
	    set gdb_is_regexp($count) $kind
	    set gdb_command($count) "print $var"
	}
	puts $fd $gdb_command($count)
    }
    set gdb_tests {}

    puts $fd "quit"
    close $fd

    set res [remote_spawn target "$gdb_name -nx -nw -quiet -batch -x $cmd_file "]
    if { $res < 0 || $res == "" } {
	unsupported "$testname"
	return
    }

    set test_counter 0
    remote_expect target [timeout_value] {
	-re {^(type|\$([0-9]+)) = ([^\n\r]*)[\n\r]+} {
	    send_log "got: $expect_out(buffer)"

	    incr test_counter
	    set first $expect_out(3,string)

	    if {$gdb_is_type($test_counter)} {
		if {$expect_out(1,string) != "type"} {
		    error "gdb failure"
		}
		set match [expr {![string compare $first \
				     $gdb_expected($test_counter)]}]
	    } elseif {$gdb_is_regexp($test_counter)} {
		set match [regexp -- $gdb_expected($test_counter) $first]
	    } else {
		set match [expr {![string compare $first \
				     $gdb_expected($test_counter)]}]
	    }

	    if {$match} {
		pass "$testname $gdb_command($test_counter)"
	    } else {
		fail "$testname $gdb_command($test_counter)"
		verbose "     got =>$first<="
		verbose "expected =>$gdb_expected($test_counter)<="
	    }

	    if {$test_counter == $count} {
		remote_close target
		return
	    } else {
		exp_continue
	    }
	}

	-re {Python scripting is not supported in this copy of GDB.[\n\r]+} {
	    unsupported "$testname"
	    remote_close target
	    return
	}

	-re {^[^$][^\n\r]*[\n\r]+} {
	    send_log "skipping: $expect_out(buffer)"
	    exp_continue
	}

	timeout {
	    unsupported "$testname"
	    remote_close target
	    return
	}
    }

    remote_close target
    unsupported "$testname"
    return
}

# Invoke gdb with a command and pattern-match the output.
proc gdb_batch_check {command pattern} {
    set gdb_name $::env(GUALITY_GDB_NAME)
    set cmd "$gdb_name -nw -nx -quiet -batch -ex \"$command\""
    send_log "Spawning: $cmd\n"
    if [catch { set res [remote_spawn target "$cmd"] } ] {
	return 0
    }
    if { $res < 0 || $res == "" } {
	return 0
    }

    remote_expect target [timeout_value] {
	-re $pattern {
	    return 1
	}

	-re {^[^\n\r]*[\n\r]+} {
	    verbose "skipping: $expect_out(buffer)"
	    exp_continue
	}

	timeout {
	    remote_close target
	    return 0
	}
    }

    remote_close target
    return 0
}

# Check for a new-enough version of gdb.  The pretty-printer tests
# require gdb 7.3, but we don't want to test versions, so instead we
# check for the python "lookup_global_symbol" method, which is in 7.3
# but not earlier versions.
# Return 1 if the version is ok, 0 otherwise.
proc gdb_version_check {} {
    return [gdb_batch_check "python print(gdb.lookup_global_symbol)" \
	      "<built-in function lookup_global_symbol>"]
}

# Check for a version of gdb which supports xmethod tests.  It is done
# in a manner similar to the check for a version of gdb which supports the
# pretty-printer tests below.
proc gdb_version_check_xmethods {} {
    return [gdb_batch_check \
	      "python import gdb.xmethod; print(gdb.xmethod.XMethod)" \
	      "<class 'gdb\\.xmethod\\.XMethod'>"]
}