share/bison/c.m4 - chromium/deps/bison - Git at Google

                                                             -*- Autoconf -*-

 # C M4 Macros for Bison.
 # Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008 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 this program.  If not, see <http://www.gnu.org/licenses/>.

 ## ---------------- ##
 ## Identification.  ##
 ## ---------------- ##

 # b4_comment(TEXT)
 # ----------------
 m4_define([b4_comment], [/* m4_bpatsubst([$1], [
 ], [
    ])  */])

 # b4_identification
 # -----------------
 # Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
 # b4_pull_flag if they use the values of the %define variables api.pure or
 # api.push_pull.
 m4_define([b4_identification],
 [[/* Identify Bison output.  */
 #define YYBISON 1

 /* Bison version.  */
 #define YYBISON_VERSION "]b4_version["

 /* Skeleton name.  */
 #define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[

 /* Pure parsers.  */
 #define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[

 /* Push parsers.  */
 #define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[

 /* Pull parsers.  */
 #define YYPULL ]b4_pull_flag])[

 /* Using locations.  */
 #define YYLSP_NEEDED ]b4_locations_flag[
 ]])


 ## ---------------- ##
 ## Default values.  ##
 ## ---------------- ##

 # If the %union is not named, its name is YYSTYPE.
 m4_define_default([b4_union_name], [YYSTYPE])

 # If the %name-prefix is not given, it is yy.
 m4_define_default([b4_prefix], [yy])

 ## ------------------------ ##
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##

 # b4_user_args
 # ------------
 m4_define([b4_user_args],
 [m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])


 # b4_parse_param
 # --------------
 # If defined, b4_parse_param arrives double quoted, but below we prefer
 # it to be single quoted.
 m4_define([b4_parse_param],
 b4_parse_param)


 # b4_parse_param_for(DECL, FORMAL, BODY)
 # ---------------------------------------
 # Iterate over the user parameters, binding the declaration to DECL,
 # the formal name to FORMAL, and evaluating the BODY.
 m4_define([b4_parse_param_for],
 [m4_foreach([$1_$2], m4_defn([b4_parse_param]),
 [m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
 m4_pushdef([$2], m4_shift($1_$2))dnl
 $3[]dnl
 m4_popdef([$2])dnl
 m4_popdef([$1])dnl
 ])])

 # b4_parse_param_use
 # ------------------
 # `YYUSE' all the parse-params.
 m4_define([b4_parse_param_use],
 [b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 ])dnl
 ])


 ## ------------ ##
 ## Data Types.  ##
 ## ------------ ##

 # b4_int_type(MIN, MAX)
 # ---------------------
 # Return the smallest int type able to handle numbers ranging from
 # MIN to MAX (included).
 m4_define([b4_int_type],
 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
        b4_ints_in($@,   [-128],   [127]), [1], [signed char],

        b4_ints_in($@,      [0], [65535]), [1], [unsigned short int],
        b4_ints_in($@, [-32768], [32767]), [1], [short int],

        m4_eval([0 <= $1]),                [1], [unsigned int],

 					       [int])])


 # b4_int_type_for(NAME)
 # ---------------------
 # Return the smallest int type able to handle numbers ranging from
 # `NAME_min' to `NAME_max' (included).
 m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])


 ## ---------##
 ## Values.  ##
 ## ---------##

 # b4_null
 ---------
 # Return a null pointer constant.  NULL infringes on the user name
 # space in C, so use 0 rather than NULL.
 m4_define([b4_null], [0])


 ## ------------------------- ##
 ## Assigning token numbers.  ##
 ## ------------------------- ##

 # b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
 # -----------------------------------------
 # Output the definition of this token as #define.
 m4_define([b4_token_define],
 [#define $1 $2
 ])


 # b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -------------------------------------------------------
 # Output the definition of the tokens (if there are) as #defines.
 m4_define([b4_token_defines],
 [m4_if([$#$1], [1], [],
 [/* Tokens.  */
 m4_map([b4_token_define], [$@])])
 ])


 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 # ---------------------------------------
 # Output the definition of this token as an enum.
 m4_define([b4_token_enum],
 [$1 = $2])


 # b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -----------------------------------------------------
 # Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
 [m4_if([$#$1], [1], [],
 [/* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
    /* Put the tokens into the symbol table, so that GDB and other debuggers
       know about them.  */
    enum yytokentype {
 m4_map_sep([     b4_token_enum], [,
 ],
 	   [$@])
    };
 #endif
 ])])


 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -------------------------------------------------------------
 # Output the definition of the tokens (if there are any) as enums and, if POSIX
 # Yacc is enabled, as #defines.
 m4_define([b4_token_enums_defines],
 [b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
 ])


 ## --------------------------------------------- ##
 ## Defining C functions in both K&R and ANSI-C.  ##
 ## --------------------------------------------- ##


 # b4_modern_c
 # -----------
 # A predicate useful in #if to determine whether C is ancient or modern.
 #
 # If __STDC__ is defined, the compiler is modern.  IBM xlc 7.0 when run
 # as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
 # reasons, but it defines __C99__FUNC__ so check that as well.
 # Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
 # Consider a C++ compiler to be modern if it defines __cplusplus.
 #
 m4_define([b4_c_modern],
   [[(defined __STDC__ || defined __C99__FUNC__ \
      || defined __cplusplus || defined _MSC_VER)]])

 # b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # ----------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_function_def],
 [#if b4_c_modern
 b4_c_ansi_function_def($@)
 #else
 $2
 $1 (b4_c_knr_formal_names(m4_shift2($@)))
 b4_c_knr_formal_decls(m4_shift2($@))
 #endif[]dnl
 ])


 # b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # ---------------------------------------------------------------
 # Declare the function NAME in ANSI.
 m4_define([b4_c_ansi_function_def],
 [$2
 $1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
 ])


 # b4_c_ansi_formals([DECL1, NAME1], ...)
 # --------------------------------------
 # Output the arguments ANSI-C definition.
 m4_define([b4_c_ansi_formals],
 [m4_if([$#], [0], [void],
        [$#$1], [1], [void],
 	       [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])

 m4_define([b4_c_ansi_formal],
 [$1])


 # b4_c_knr_formal_names([DECL1, NAME1], ...)
 # ------------------------------------------
 # Output the argument names.
 m4_define([b4_c_knr_formal_names],
 [m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])

 m4_define([b4_c_knr_formal_name],
 [$2])


 # b4_c_knr_formal_decls([DECL1, NAME1], ...)
 # ------------------------------------------
 # Output the K&R argument declarations.
 m4_define([b4_c_knr_formal_decls],
 [m4_map_sep([b4_c_knr_formal_decl],
 	    [
 ],
 	    [$@])])

 m4_define([b4_c_knr_formal_decl],
 [    $1;])


 ## ------------------------------------------------------------ ##
 ## Declaring (prototyping) C functions in both K&R and ANSI-C.  ##
 ## ------------------------------------------------------------ ##


 # b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # -----------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_function_decl],
 [#if defined __STDC__ || defined __cplusplus
 b4_c_ansi_function_decl($@)
 #else
 $2 $1 ();
 #endif[]dnl
 ])


 # b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # ----------------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_ansi_function_decl],
 [$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
 ])


 ## --------------------- ##
 ## Calling C functions.  ##
 ## --------------------- ##


 # b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # -----------------------------------------------------------
 # Call the function NAME with arguments NAME1, NAME2 etc.
 m4_define([b4_c_function_call],
 [$1 (b4_c_args(m4_shift2($@)))[]dnl
 ])


 # b4_c_args([DECL1, NAME1], ...)
 # ------------------------------
 # Output the arguments NAME1, NAME2...
 m4_define([b4_c_args],
 [m4_map_sep([b4_c_arg], [, ], [$@])])

 m4_define([b4_c_arg],
 [$2])


 ## ----------- ##
 ## Synclines.  ##
 ## ----------- ##

 # b4_sync_start(LINE, FILE)
 # -----------------------
 m4_define([b4_sync_start], [[#]line $1 $2])


 ## -------------- ##
 ## User actions.  ##
 ## -------------- ##

 # b4_case(LABEL, STATEMENTS)
 # --------------------------
 m4_define([b4_case],
 [  case $1:
 $2
     break;])

 # b4_symbol_actions(FILENAME, LINENO,
 #                   SYMBOL-TAG, SYMBOL-NUM,
 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 # -------------------------------------------------
 m4_define([b4_symbol_actions],
 [m4_pushdef([b4_dollar_dollar],
    [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
 m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
       case $4: /* $3 */
 b4_syncline([$2], [$1])
 	$5;
 b4_syncline([@oline@], [@ofile@])
 	break;
 m4_popdef([b4_at_dollar])dnl
 m4_popdef([b4_dollar_dollar])dnl
 ])


 # b4_yydestruct_generate(FUNCTION-DECLARATOR)
 # -------------------------------------------
 # Generate the "yydestruct" function, which declaration is issued using
 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 # or "b4_c_function_def" for K&R.
 m4_define_default([b4_yydestruct_generate],
 [[/*-----------------------------------------------.
 | Release the memory associated to this symbol.  |
 `-----------------------------------------------*/

 /*ARGSUSED*/
 ]$1([yydestruct],
     [static void],
     [[const char *yymsg],    [yymsg]],
     [[int yytype],           [yytype]],
     [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
 b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   YYUSE (yyvaluep);
 ]b4_locations_if([  YYUSE (yylocationp);
 ])dnl
 b4_parse_param_use[]dnl
 [
   if (!yymsg)
     yymsg = "Deleting";
   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);

   switch (yytype)
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
       default:
 	break;
     }
 }]dnl
 ])


 # b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
 # ------------------------------------------------
 # Generate the "yy_symbol_print" function, which declaration is issued using
 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 # or "b4_c_function_def" for K&R.
 m4_define_default([b4_yy_symbol_print_generate],
 [[
 /*--------------------------------.
 | Print this symbol on YYOUTPUT.  |
 `--------------------------------*/

 /*ARGSUSED*/
 ]$1([yy_symbol_value_print],
     [static void],
 	       [[FILE *yyoutput],                       [yyoutput]],
 	       [[int yytype],                           [yytype]],
 	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   if (!yyvaluep)
     return;
 ]b4_locations_if([  YYUSE (yylocationp);
 ])dnl
 b4_parse_param_use[]dnl
 [# ifdef YYPRINT
   if (yytype < YYNTOKENS)
     YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
 # else
   YYUSE (yyoutput);
 # endif
   switch (yytype)
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [      default:
 	break;
     }
 }


 /*--------------------------------.
 | Print this symbol on YYOUTPUT.  |
 `--------------------------------*/

 ]$1([yy_symbol_print],
     [static void],
 	       [[FILE *yyoutput],                       [yyoutput]],
 	       [[int yytype],                           [yytype]],
 	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
 b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   if (yytype < YYNTOKENS)
     YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
   else
     YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);

 ]b4_locations_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
   YYFPRINTF (yyoutput, ": ");
 ])dnl
 [  yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
 b4_locations_if([, yylocationp])[]b4_user_args[);
   YYFPRINTF (yyoutput, ")");
 }]dnl
 ])
	-- Autoconf --

	# C M4 Macros for Bison.
	# Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008 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 this program. If not, see <http://www.gnu.org/licenses/>.

	## ---------------- ##
	## Identification. ##
	## ---------------- ##

	# b4_comment(TEXT)
	# ----------------
	m4_define([b4_comment], [/* m4_bpatsubst([$1], [
	], [
	]) */])

	# b4_identification
	# -----------------
	# Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
	# b4_pull_flag if they use the values of the %define variables api.pure or
	# api.push_pull.
	m4_define([b4_identification],
	[[/* Identify Bison output. */
	#define YYBISON 1

	/* Bison version. */
	#define YYBISON_VERSION "]b4_version["

	/* Skeleton name. */
	#define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[

	/* Pure parsers. */
	#define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[

	/* Push parsers. */
	#define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[

	/* Pull parsers. */
	#define YYPULL ]b4_pull_flag])[

	/* Using locations. */
	#define YYLSP_NEEDED ]b4_locations_flag[
	]])


	## ---------------- ##
	## Default values. ##
	## ---------------- ##

	# If the %union is not named, its name is YYSTYPE.
	m4_define_default([b4_union_name], [YYSTYPE])

	# If the %name-prefix is not given, it is yy.
	m4_define_default([b4_prefix], [yy])

	## ------------------------ ##
	## Pure/impure interfaces. ##
	## ------------------------ ##

	# b4_user_args
	# ------------
	m4_define([b4_user_args],
	[m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])


	# b4_parse_param
	# --------------
	# If defined, b4_parse_param arrives double quoted, but below we prefer
	# it to be single quoted.
	m4_define([b4_parse_param],
	b4_parse_param)


	# b4_parse_param_for(DECL, FORMAL, BODY)
	# ---------------------------------------
	# Iterate over the user parameters, binding the declaration to DECL,
	# the formal name to FORMAL, and evaluating the BODY.
	m4_define([b4_parse_param_for],
	[m4_foreach([$1_$2], m4_defn([b4_parse_param]),
	[m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
	m4_pushdef([$2], m4_shift($1_$2))dnl
	$3[]dnl
	m4_popdef([$2])dnl
	m4_popdef([$1])dnl
	])])

	# b4_parse_param_use
	# ------------------
	# `YYUSE' all the parse-params.
	m4_define([b4_parse_param_use],
	[b4_parse_param_for([Decl], [Formal], [ YYUSE (Formal);
	])dnl
	])


	## ------------ ##
	## Data Types. ##
	## ------------ ##

	# b4_int_type(MIN, MAX)
	# ---------------------
	# Return the smallest int type able to handle numbers ranging from
	# MIN to MAX (included).
	m4_define([b4_int_type],
	[m4_if(b4_ints_in($@, [0], [255]), [1], [unsigned char],
	b4_ints_in($@, [-128], [127]), [1], [signed char],

	b4_ints_in($@, [0], [65535]), [1], [unsigned short int],
	b4_ints_in($@, [-32768], [32767]), [1], [short int],

	m4_eval([0 <= $1]), [1], [unsigned int],

	[int])])


	# b4_int_type_for(NAME)
	# ---------------------
	# Return the smallest int type able to handle numbers ranging from
	# `NAME_min' to `NAME_max' (included).
	m4_define([b4_int_type_for],
	[b4_int_type($1_min, $1_max)])



	## ---------##
	## Values. ##
	## ---------##

	# b4_null
	---------
	# Return a null pointer constant. NULL infringes on the user name
	# space in C, so use 0 rather than NULL.
	m4_define([b4_null], [0])




	## ------------------------- ##
	## Assigning token numbers. ##
	## ------------------------- ##

	# b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
	# -----------------------------------------
	# Output the definition of this token as #define.
	m4_define([b4_token_define],
	[#define $1 $2
	])


	# b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
	# -------------------------------------------------------
	# Output the definition of the tokens (if there are) as #defines.
	m4_define([b4_token_defines],
	[m4_if([$#$1], [1], [],
	[/* Tokens. */
	m4_map([b4_token_define], [$@])])
	])


	# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
	# ---------------------------------------
	# Output the definition of this token as an enum.
	m4_define([b4_token_enum],
	[$1 = $2])


	# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
	# -----------------------------------------------------
	# Output the definition of the tokens (if there are) as enums.
	m4_define([b4_token_enums],
	[m4_if([$#$1], [1], [],
	[/* Tokens. */
	#ifndef YYTOKENTYPE
	# define YYTOKENTYPE
	/* Put the tokens into the symbol table, so that GDB and other debuggers
	know about them. */
	enum yytokentype {
	m4_map_sep([ b4_token_enum], [,
	],
	[$@])
	};
	#endif
	])])


	# b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
	# -------------------------------------------------------------
	# Output the definition of the tokens (if there are any) as enums and, if POSIX
	# Yacc is enabled, as #defines.
	m4_define([b4_token_enums_defines],
	[b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
	])



	## --------------------------------------------- ##
	## Defining C functions in both K&R and ANSI-C. ##
	## --------------------------------------------- ##


	# b4_modern_c
	# -----------
	# A predicate useful in #if to determine whether C is ancient or modern.
	#
	# If __STDC__ is defined, the compiler is modern. IBM xlc 7.0 when run
	# as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
	# reasons, but it defines __C99__FUNC__ so check that as well.
	# Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
	# Consider a C++ compiler to be modern if it defines __cplusplus.
	#
	m4_define([b4_c_modern],
	[[(defined __STDC__ \|\| defined __C99__FUNC__ \
	\|\| defined __cplusplus \|\| defined _MSC_VER)]])

	# b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
	# ----------------------------------------------------------
	# Declare the function NAME.
	m4_define([b4_c_function_def],
	[#if b4_c_modern
	b4_c_ansi_function_def($@)
	#else
	$2
	$1 (b4_c_knr_formal_names(m4_shift2($@)))
	b4_c_knr_formal_decls(m4_shift2($@))
	#endif[]dnl
	])


	# b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
	# ---------------------------------------------------------------
	# Declare the function NAME in ANSI.
	m4_define([b4_c_ansi_function_def],
	[$2
	$1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
	])


	# b4_c_ansi_formals([DECL1, NAME1], ...)
	# --------------------------------------
	# Output the arguments ANSI-C definition.
	m4_define([b4_c_ansi_formals],
	[m4_if([$#], [0], [void],
	[$#$1], [1], [void],
	[m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])

	m4_define([b4_c_ansi_formal],
	[$1])


	# b4_c_knr_formal_names([DECL1, NAME1], ...)
	# ------------------------------------------
	# Output the argument names.
	m4_define([b4_c_knr_formal_names],
	[m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])

	m4_define([b4_c_knr_formal_name],
	[$2])


	# b4_c_knr_formal_decls([DECL1, NAME1], ...)
	# ------------------------------------------
	# Output the K&R argument declarations.
	m4_define([b4_c_knr_formal_decls],
	[m4_map_sep([b4_c_knr_formal_decl],
	[
	],
	[$@])])

	m4_define([b4_c_knr_formal_decl],
	[ $1;])



	## ------------------------------------------------------------ ##
	## Declaring (prototyping) C functions in both K&R and ANSI-C. ##
	## ------------------------------------------------------------ ##


	# b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
	# -----------------------------------------------------------
	# Declare the function NAME.
	m4_define([b4_c_function_decl],
	[#if defined __STDC__ \|\| defined __cplusplus
	b4_c_ansi_function_decl($@)
	#else
	$2 $1 ();
	#endif[]dnl
	])


	# b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
	# ----------------------------------------------------------------
	# Declare the function NAME.
	m4_define([b4_c_ansi_function_decl],
	[$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
	])




	## --------------------- ##
	## Calling C functions. ##
	## --------------------- ##


	# b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
	# -----------------------------------------------------------
	# Call the function NAME with arguments NAME1, NAME2 etc.
	m4_define([b4_c_function_call],
	[$1 (b4_c_args(m4_shift2($@)))[]dnl
	])


	# b4_c_args([DECL1, NAME1], ...)
	# ------------------------------
	# Output the arguments NAME1, NAME2...
	m4_define([b4_c_args],
	[m4_map_sep([b4_c_arg], [, ], [$@])])

	m4_define([b4_c_arg],
	[$2])


	## ----------- ##
	## Synclines. ##
	## ----------- ##

	# b4_sync_start(LINE, FILE)
	# -----------------------
	m4_define([b4_sync_start], [[#]line $1 $2])


	## -------------- ##
	## User actions. ##
	## -------------- ##

	# b4_case(LABEL, STATEMENTS)
	# --------------------------
	m4_define([b4_case],
	[ case $1:
	$2
	break;])

	# b4_symbol_actions(FILENAME, LINENO,
	# SYMBOL-TAG, SYMBOL-NUM,
	# SYMBOL-ACTION, SYMBOL-TYPENAME)
	# -------------------------------------------------
	m4_define([b4_symbol_actions],
	[m4_pushdef([b4_dollar_dollar],
	[m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
	m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
	case $4: /* $3 */
	b4_syncline([$2], [$1])
	$5;
	b4_syncline([@oline@], [@ofile@])
	break;
	m4_popdef([b4_at_dollar])dnl
	m4_popdef([b4_dollar_dollar])dnl
	])


	# b4_yydestruct_generate(FUNCTION-DECLARATOR)
	# -------------------------------------------
	# Generate the "yydestruct" function, which declaration is issued using
	# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
	# or "b4_c_function_def" for K&R.
	m4_define_default([b4_yydestruct_generate],
	[[/*-----------------------------------------------.
	\| Release the memory associated to this symbol. \|
	`-----------------------------------------------*/

	/ARGSUSED/
	]$1([yydestruct],
	[static void],
	[[const char *yymsg], [yymsg]],
	[[int yytype], [yytype]],
	[[YYSTYPE *yyvaluep], [yyvaluep]][]dnl
	b4_locations_if( [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
	m4_ifset([b4_parse_param], [, b4_parse_param]))[
	{
	YYUSE (yyvaluep);
	]b4_locations_if([ YYUSE (yylocationp);
	])dnl
	b4_parse_param_use[]dnl
	[
	if (!yymsg)
	yymsg = "Deleting";
	YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);

	switch (yytype)
	{
	]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
	default:
	break;
	}
	}]dnl
	])


	# b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
	# ------------------------------------------------
	# Generate the "yy_symbol_print" function, which declaration is issued using
	# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
	# or "b4_c_function_def" for K&R.
	m4_define_default([b4_yy_symbol_print_generate],
	[[
	/*--------------------------------.
	\| Print this symbol on YYOUTPUT. \|
	`--------------------------------*/

	/ARGSUSED/
	]$1([yy_symbol_value_print],
	[static void],
	[[FILE *yyoutput], [yyoutput]],
	[[int yytype], [yytype]],
	[[YYSTYPE const * const yyvaluep], [yyvaluep]][]dnl
	b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
	m4_ifset([b4_parse_param], [, b4_parse_param]))[
	{
	if (!yyvaluep)
	return;
	]b4_locations_if([ YYUSE (yylocationp);
	])dnl
	b4_parse_param_use[]dnl
	[# ifdef YYPRINT
	if (yytype < YYNTOKENS)
	YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
	# else
	YYUSE (yyoutput);
	# endif
	switch (yytype)
	{
	]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
	[ default:
	break;
	}
	}


	/*--------------------------------.
	\| Print this symbol on YYOUTPUT. \|
	`--------------------------------*/

	]$1([yy_symbol_print],
	[static void],
	[[FILE *yyoutput], [yyoutput]],
	[[int yytype], [yytype]],
	[[YYSTYPE const * const yyvaluep], [yyvaluep]][]dnl
	b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
	m4_ifset([b4_parse_param], [, b4_parse_param]))[
	{
	if (yytype < YYNTOKENS)
	YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
	else
	YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);

	]b4_locations_if([ YY_LOCATION_PRINT (yyoutput, *yylocationp);
	YYFPRINTF (yyoutput, ": ");
	])dnl
	[ yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
	b4_locations_if([, yylocationp])[]b4_user_args[);
	YYFPRINTF (yyoutput, ")");
	}]dnl
	])