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#  Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010

#  Free Software Foundation, Inc.

#  Contributed by Kelley Cook, June 2004.

#  Original code from Neil Booth, May 2003.

#

# 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, 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; see the file COPYING3.  If not see

# <http://www.gnu.org/licenses/>.

# Some common subroutines for use by opt[ch]-gen.awk.

# Return nonzero if FLAGS contains a flag matching REGEX.

function flag_set_p(regex, flags)

{

        return (" " flags " ") ~ (" " regex " ")

}

# Return STRING if FLAGS contains a flag matching regexp REGEX,

# otherwise return the empty string.

function test_flag(regex, flags, string)

{

        if (flag_set_p(regex, flags))

                return string

        return ""

}

# If FLAGS contains a "NAME(...argument...)" flag, return the value

# of the argument.  Return the empty string otherwise.

function opt_args(name, flags)

{

        flags = " " flags

        if (flags !~ " " name "\\(")

                return ""

        sub(".* " name "\\(", "", flags)

        if (flags ~ "^{")

        {

                sub ("^{", "", flags)

                sub("}\\).*", "", flags)

        }

        else

                sub("\\).*", "", flags)

        return flags

}

# Return the Nth comma-separated element of S.  Return the empty string

# if S does not contain N elements.

function nth_arg(n, s)

{

        while (n-- > 0) {

                if (s !~ ",")

                        return ""

                sub("[^,]*, *", "", s)

        }

        sub(",.*", "", s)

        return s

}

# Return a bitmask of CL_* values for option flags FLAGS.

function switch_flags (flags)

{

        result = "0"

        for (j = 0; j < n_langs; j++) {

                regex = langs[j]

                gsub ( "\\+", "\\+", regex )

                result = result test_flag(regex, flags, " | " macros[j])

        }

        result = result \

          test_flag("Common", flags, " | CL_COMMON") \

          test_flag("Target", flags, " | CL_TARGET") \

          test_flag("Save", flags, " | CL_SAVE") \

          test_flag("Joined", flags, " | CL_JOINED") \

          test_flag("JoinedOrMissing", flags, " | CL_JOINED | CL_MISSING_OK") \

          test_flag("Separate", flags, " | CL_SEPARATE") \

          test_flag("RejectNegative", flags, " | CL_REJECT_NEGATIVE") \

          test_flag("UInteger", flags, " | CL_UINTEGER") \

          test_flag("Undocumented", flags,  " | CL_UNDOCUMENTED") \

          test_flag("Warning", flags,  " | CL_WARNING") \

          test_flag("Optimization", flags,  " | CL_OPTIMIZATION") \

          test_flag("Report", flags, " | CL_REPORT")

        sub( "^0 \\| ", "", result )

        return result

}

# If FLAGS includes a Var flag, return the name of the variable it specifies.

# Return the empty string otherwise.

function var_name(flags)

{

        return nth_arg(0, opt_args("Var", flags))

}

# Return true if the option described by FLAGS has a globally-visible state.

function global_state_p(flags)

{

        return (var_name(flags) != "" \

                || opt_args("Mask", flags) != "" \

                || opt_args("InverseMask", flags) != "")

}

# Return true if the option described by FLAGS must have some state

# associated with it.

function needs_state_p(flags)

{

        return flag_set_p("Target", flags)

}

# If FLAGS describes an option that needs a static state variable,

# return the name of that variable, otherwise return "".  NAME is

# the name of the option.

function static_var(name, flags)

{

        if (global_state_p(flags) || !needs_state_p(flags))

                return ""

        gsub ("[^A-Za-z0-9]", "_", name)

        return "VAR_" name

}

# Return the type of variable that should be associated with the given flags.

function var_type(flags)

{

        if (!flag_set_p("Joined.*", flags))

                return "int "

        else if (flag_set_p("UInteger", flags))

                return "int "

        else

                return "const char *"

}

# Return the type of variable that should be associated with the given flags

# for use within a structure.  Simple variables are changed to signed char

# type instead of int to save space.

function var_type_struct(flags)

{

        if (flag_set_p("UInteger", flags))

                return "int "

        else if (!flag_set_p("Joined.*", flags)) {

                if (flag_set_p(".*Mask.*", flags))

                        return "int "

                else

                        return "signed char "

        }

        else

                return "const char *"

}

# Given that an option has flags FLAGS, return an initializer for the

# "var_cond" and "var_value" fields of its cl_options[] entry.

function var_set(flags)

{

        s = nth_arg(1, opt_args("Var", flags))

        if (s != "")

                return "CLVC_EQUAL, " s

        s = opt_args("Mask", flags);

        if (s != "") {

                vn = var_name(flags);

                if (vn)

                        return "CLVC_BIT_SET, OPTION_MASK_" s

                else

                        return "CLVC_BIT_SET, MASK_" s

        }

        s = nth_arg(0, opt_args("InverseMask", flags));

        if (s != "") {

                vn = var_name(flags);

                if (vn)

                        return "CLVC_BIT_CLEAR, OPTION_MASK_" s

                else

                        return "CLVC_BIT_CLEAR, MASK_" s

        }

        if (var_type(flags) == "const char *")

                return "CLVC_STRING, 0"

        return "CLVC_BOOLEAN, 0"

}

# Given that an option called NAME has flags FLAGS, return an initializer

# for the "flag_var" field of its cl_options[] entry.

function var_ref(name, flags)

{

        name = var_name(flags) static_var(name, flags)

        if (name != "")

                return "&" name

        if (opt_args("Mask", flags) != "")

                return "&target_flags"

        if (opt_args("InverseMask", flags) != "")

                return "&target_flags"

        return "0"

}