scanner: use explicit "ignore" statements

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 86aca1059d6b22262400e9d3ce4359d5d0a3bbae..8bd96b8573f728b0bbf35c593ef33ddea5a082f8 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,83 +1,115 @@
-m4_divert(-1)                                               -*- Autoconf -*-
+                                                            -*- Autoconf -*-

 
 # C M4 Macros for Bison.
 
 # C M4 Macros for Bison.

-# Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.

 
 

-# This program is free software; you can redistribute it and/or modify
+# Copyright (C) 2002, 2004-2012 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
 # it under the terms of the GNU General Public License as published by

-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or

 # (at your option) any later version.
 # (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.
 # 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
 # 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., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301  USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

 
 

+m4_include(b4_pkgdatadir/[c-like.m4])

 
 

-## ---------------- ##
-## Identification.  ##
-## ---------------- ##
+# b4_tocpp(STRING)
+# ----------------
+# Convert STRING into a valid C macro name.
+m4_define([b4_tocpp],
+[m4_toupper(m4_bpatsubst(m4_quote($1), [[^a-zA-Z0-9]+], [_]))])
+
+
+# b4_cpp_guard(FILE)
+# ------------------
+# A valid C macro name to use as a CPP header guard for FILE.
+m4_define([b4_cpp_guard],
+[[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])

 
 

-# b4_copyright(TITLE, YEARS)
-# --------------------------
-m4_define([b4_copyright],
-[/* A Bison parser, made by GNU Bison b4_version.  */

 
 

-/* $1,
-   Copyright (C) $2 Free Software Foundation, Inc.
+# b4_cpp_guard_open(FILE)
+# b4_cpp_guard_close(FILE)
+# ------------------------
+# If FILE does not expand to nothing, open/close CPP inclusion guards for FILE.
+m4_define([b4_cpp_guard_open],
+[m4_ifval(m4_quote($1),
+[#ifndef b4_cpp_guard([$1])
+# define b4_cpp_guard([$1])])])

 
 

-   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, or (at your option)
-   any later version.
+m4_define([b4_cpp_guard_close],
+[m4_ifval(m4_quote($1),
+[#endif b4_comment([!b4_cpp_guard([$1])])])])

 
 

-   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., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */])
+## ---------------- ##
+## Identification.  ##
+## ---------------- ##

 
 

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

 
 # b4_identification
 # -----------------
 
 # 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],
 m4_define([b4_identification],

-[/* Identify Bison output.  */
-[#]define YYBISON 1
+[[/* Identify Bison output.  */
+#define YYBISON 1
+
+/* Bison version.  */
+#define YYBISON_VERSION "]b4_version["

 
 /* Skeleton name.  */
 
 /* Skeleton name.  */

-[#]define YYSKELETON_NAME b4_skeleton
+#define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[

 
 /* Pure parsers.  */
 
 /* Pure parsers.  */

-[#]define YYPURE b4_pure
+#define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[

 
 

-/* Using locations.  */
-[#]define YYLSP_NEEDED b4_locations_flag
-])
+/* Push parsers.  */
+#define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[

 
 

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

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

-m4_define_default([b4_epilogue], [])
+# b4_api_prefix, b4_api_PREFIX
+# ----------------------------
+# Corresponds to %define api.prefix
+b4_percent_define_default([[api.prefix]], [[yy]])
+m4_define([b4_api_prefix],
+[b4_percent_define_get([[api.prefix]])])
+m4_define([b4_api_PREFIX],
+[m4_toupper(b4_api_prefix)])

 
 
 
 

+# b4_prefix
+# ---------
+# If the %name-prefix is not given, it is api.prefix.
+m4_define_default([b4_prefix], [b4_api_prefix])
+
+# If the %union is not named, its name is YYSTYPE.
+m4_define_default([b4_union_name], [b4_api_PREFIX[]STYPE])
+

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

-

 # b4_user_args
 # ------------
 m4_define([b4_user_args],
 # b4_user_args
 # ------------
 m4_define([b4_user_args],


@@ -88,24 +120,36 @@ m4_define([b4_user_args],
 # --------------
 # If defined, b4_parse_param arrives double quoted, but below we prefer
 # it to be single quoted.
 # --------------
 # If defined, b4_parse_param arrives double quoted, but below we prefer
 # it to be single quoted.

-m4_define_default([b4_parse_param])

 m4_define([b4_parse_param],
 m4_define([b4_parse_param],

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

-
-# b4_ints_in(INT1, INT2, LOW, HIGH)
-# ---------------------------------
-# Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
-m4_define([b4_ints_in],
-[m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
-
-

 # b4_int_type(MIN, MAX)
 # ---------------------
 # Return the smallest int type able to handle numbers ranging from
 # b4_int_type(MIN, MAX)
 # ---------------------
 # Return the smallest int type able to handle numbers ranging from


@@ -119,7 +163,7 @@ m4_define([b4_int_type],
 
        m4_eval([0 <= $1]),                [1], [unsigned int],
 
 
        m4_eval([0 <= $1]),                [1], [unsigned int],
 

-                                              [int])])
+                                              [int])])

 
 
 # b4_int_type_for(NAME)
 
 
 # b4_int_type_for(NAME)


@@ -130,27 +174,43 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
 [b4_int_type($1_min, $1_max)])
 
 

-## ------------------ ##
-## Decoding options.  ##
-## ------------------ ##
+# b4_table_value_equals(TABLE, VALUE, LITERAL)
+# --------------------------------------------
+# Without inducing a comparison warning from the compiler, check if the
+# literal value LITERAL equals VALUE from table TABLE, which must have
+# TABLE_min and TABLE_max defined.  YYID must be defined as an identity
+# function that suppresses warnings about constant conditions.
+m4_define([b4_table_value_equals],
+[m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
+               || m4_indir([b4_]$1[_max]) < $3), [1],
+       [[YYID (0)]],
+       [(!!(($2) == ($3)))])])
+
+
+## ---------##
+## Values.  ##
+## ---------##

 
 
 
 

-# b4_location_if(IF-TRUE, IF-FALSE)
-# ---------------------------------
-# Expand IF-TRUE, if locations are used, IF-FALSE otherwise.
-m4_define([b4_location_if],
-[m4_if(b4_locations_flag, [1],
-       [$1],
-       [$2])])
+# b4_null_define
+# --------------
+# Portability issues: define a YY_NULL appropriate for the current
+# language (C, C++98, or C++11).
+m4_define([b4_null_define],
+[# ifndef YY_NULL
+#  if defined __cplusplus && 201103L <= __cplusplus
+#   define YY_NULL nullptr
+#  else
+#   define YY_NULL 0
+#  endif
+# endif[]dnl
+])

 
 
 
 

-# b4_pure_if(IF-TRUE, IF-FALSE)
-# -----------------------------
-# Expand IF-TRUE, if %pure-parser, IF-FALSE otherwise.
-m4_define([b4_pure_if],
-[m4_if(b4_pure, [1],
-       [$1],
-       [$2])])
+# b4_null
+# -------
+# Return a null pointer constant.
+m4_define([b4_null], [YY_NULL])

 
 
 
 
 
 


@@ -166,6 +226,16 @@ m4_define([b4_token_define],
 ])
 
 
 ])
 
 

+# 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.
 # b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
 # ---------------------------------------
 # Output the definition of this token as an enum.


@@ -173,24 +243,31 @@ m4_define([b4_token_enum],
 [$1 = $2])
 
 
 [$1 = $2])
 
 

-# b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -------------------------------------------------------
-# Output the definition of the tokens (if there are) as enums and #define.
-m4_define([b4_token_defines],
-[m4_if([$@], [[]], [],
-[/* Tokens.  */
-#ifndef YYTOKENTYPE
-# define YYTOKENTYPE
+# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
+# -----------------------------------------------------
+# Output the definition of the tokens (if there are) as enums.
+m4_define([b4_token_enums],
+[m4_if([$#$1], [1], [],
+[[/* Tokens.  */
+#ifndef ]b4_api_PREFIX[TOKENTYPE
+# define ]b4_api_PREFIX[TOKENTYPE

    /* Put the tokens into the symbol table, so that GDB and other debuggers
       know about them.  */
    /* Put the tokens into the symbol table, so that GDB and other debuggers
       know about them.  */

-   enum yytokentype {
-m4_map_sep([     b4_token_enum], [,
+   enum ]b4_api_prefix[tokentype {
+]m4_map_sep([     b4_token_enum], [,

 ],
 ],

-           [$@])
+          [$@])[

    };
 #endif
    };
 #endif

-m4_map([b4_token_define], [$@])
-])
+]])])
+
+
+# b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
+# -------------------------------------------------------------
+# Output the definition of the tokens (if there are any) as enums and, if POSIX
+# Yacc is enabled, as #defines.
+m4_define([b4_token_enums_defines],
+[b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])

 ])
 
 
 ])
 
 


@@ -200,16 +277,30 @@ m4_map([b4_token_define], [$@])
 ## --------------------------------------------- ##
 
 
 ## --------------------------------------------- ##
 
 

+# 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],
 # b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
 # ----------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_function_def],

-[#if defined (__STDC__) || defined (__cplusplus)
+[#if b4_c_modern

 b4_c_ansi_function_def($@)
 #else
 $2
 b4_c_ansi_function_def($@)
 #else
 $2

-$1 (b4_c_knr_formal_names(m4_shiftn(2, $@)))
-b4_c_knr_formal_decls(m4_shiftn(2, $@))
+$1 (b4_c_knr_formal_names(m4_shift2($@)))
+b4_c_knr_formal_decls(m4_shift2($@))

 #endif[]dnl
 ])
 
 #endif[]dnl
 ])
 


@@ -219,7 +310,7 @@ b4_c_knr_formal_decls(m4_shiftn(2, $@))
 # Declare the function NAME in ANSI.
 m4_define([b4_c_ansi_function_def],
 [$2
 # Declare the function NAME in ANSI.
 m4_define([b4_c_ansi_function_def],
 [$2

-$1 (b4_c_ansi_formals(m4_shiftn(2, $@)))[]dnl
+$1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl

 ])
 
 
 ])
 
 


@@ -227,10 +318,9 @@ $1 (b4_c_ansi_formals(m4_shiftn(2, $@)))[]dnl
 # --------------------------------------
 # Output the arguments ANSI-C definition.
 m4_define([b4_c_ansi_formals],
 # --------------------------------------
 # Output the arguments ANSI-C definition.
 m4_define([b4_c_ansi_formals],

-[m4_case([$@],
-         [],   [void],
-         [[]], [void],
-               [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
+[m4_if([$#], [0], [void],
+       [$#$1], [1], [void],
+              [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])

 
 m4_define([b4_c_ansi_formal],
 [$1])
 
 m4_define([b4_c_ansi_formal],
 [$1])


@@ -251,9 +341,9 @@ m4_define([b4_c_knr_formal_name],
 # Output the K&R argument declarations.
 m4_define([b4_c_knr_formal_decls],
 [m4_map_sep([b4_c_knr_formal_decl],
 # 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;])
 
 m4_define([b4_c_knr_formal_decl],
 [    $1;])


@@ -269,7 +359,7 @@ m4_define([b4_c_knr_formal_decl],
 # -----------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_function_decl],
 # -----------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_function_decl],

-[#if defined (__STDC__) || defined (__cplusplus)
+[#if defined __STDC__ || defined __cplusplus

 b4_c_ansi_function_decl($@)
 #else
 $2 $1 ();
 b4_c_ansi_function_decl($@)
 #else
 $2 $1 ();


@@ -281,7 +371,7 @@ $2 $1 ();
 # ----------------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_ansi_function_decl],
 # ----------------------------------------------------------------
 # Declare the function NAME.
 m4_define([b4_c_ansi_function_decl],

-[$2 $1 (b4_c_ansi_formals(m4_shiftn(2, $@)));[]dnl
+[$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl

 ])
 
 
 ])
 
 


@@ -296,7 +386,7 @@ m4_define([b4_c_ansi_function_decl],
 # -----------------------------------------------------------
 # Call the function NAME with arguments NAME1, NAME2 etc.
 m4_define([b4_c_function_call],
 # -----------------------------------------------------------
 # Call the function NAME with arguments NAME1, NAME2 etc.
 m4_define([b4_c_function_call],

-[$1 (b4_c_args(m4_shiftn(2, $@)))[]dnl
+[$1 (b4_c_args(m4_shift2($@)))[]dnl

 ])
 
 
 ])
 
 


@@ -314,29 +404,38 @@ m4_define([b4_c_arg],
 ## Synclines.  ##
 ## ----------- ##
 
 ## Synclines.  ##
 ## ----------- ##
 

-
-# b4_syncline(LINE, FILE)
+# b4_sync_start(LINE, FILE)

 # -----------------------
 # -----------------------

-m4_define([b4_syncline],
-[m4_if(b4_synclines_flag, 1,
-       [[#]line $1 $2])])
+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)
 # -------------------------------------------------
 # b4_symbol_actions(FILENAME, LINENO,
 #                   SYMBOL-TAG, SYMBOL-NUM,
 #                   SYMBOL-ACTION, SYMBOL-TYPENAME)
 # -------------------------------------------------

+# Issue the code for a symbol action (e.g., %printer).
+#
+# Define b4_dollar_dollar([TYPE-NAME]), and b4_at_dollar, which are
+# invoked where $<TYPE-NAME>$ and @$ were specified by the user.

 m4_define([b4_symbol_actions],
 m4_define([b4_symbol_actions],

-[m4_pushdef([b4_dollar_dollar],
-   [m4_ifval([$6], [(yyvaluep->$6)], [(*yyvaluep)])])dnl
-m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
+[b4_dollar_pushdef([(*yyvaluep)], [$6], [(*yylocationp)])dnl

       case $4: /* $3 */
 b4_syncline([$2], [$1])
       case $4: /* $3 */
 b4_syncline([$2], [$1])

-        $5;
+       $5;

 b4_syncline([@oline@], [@ofile@])
 b4_syncline([@oline@], [@ofile@])

-        break;
-m4_popdef([b4_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
+       break;
+b4_dollar_popdef[]dnl

 ])
 
 
 ])
 
 


@@ -345,22 +444,25 @@ m4_popdef([b4_dollar_dollar])dnl
 # 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.
 # 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([b4_yydestruct_generate],
+m4_define_default([b4_yydestruct_generate],

 [[/*-----------------------------------------------.
 | Release the memory associated to this symbol.  |
 `-----------------------------------------------*/
 
 [[/*-----------------------------------------------.
 | Release the memory associated to this symbol.  |
 `-----------------------------------------------*/
 

+/*ARGSUSED*/

 ]$1([yydestruct],
     [static void],
     [[const char *yymsg],    [yymsg]],
     [[int yytype],           [yytype]],
 ]$1([yydestruct],
     [static void],
     [[const char *yymsg],    [yymsg]],
     [[int yytype],           [yytype]],

-    [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
-    [[YYLTYPE *yylocationp], [yylocationp]]]))[
+    [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
+b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
+m4_ifset([b4_parse_param], [, b4_parse_param]))[

 {
 {

-  /* Pacify ``unused variable'' warnings.  */
-  (void) yyvaluep;
-]b4_location_if([  (void) yylocationp;
-])[
+  YYUSE (yyvaluep);
+]b4_locations_if([  YYUSE (yylocationp);
+])dnl
+b4_parse_param_use[]dnl
+[

   if (!yymsg)
     yymsg = "Deleting";
   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
   if (!yymsg)
     yymsg = "Deleting";
   YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);


@@ -369,53 +471,218 @@ m4_define([b4_yydestruct_generate],
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
       default:
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
       default:

-        break;
+       break;

     }
 }]dnl
 ])
 
 
     }
 }]dnl
 ])
 
 

-# b4_yysymprint_generate(FUNCTION-DECLARATOR)
-# -------------------------------------------
-# Generate the "yysymprint" function, which declaration is issued using
+# 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.
 # FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
 # or "b4_c_function_def" for K&R.

-m4_define([b4_yysymprint_generate],
-[[/*--------------------------------.
+m4_define_default([b4_yy_symbol_print_generate],
+[[
+/*--------------------------------.

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

-]$1([yysymprint],
+/*ARGSUSED*/
+]$1([yy_symbol_value_print],

     [static void],
     [static void],

-    [[FILE *yyoutput],       [yyoutput]],
-    [[int yytype],           [yytype]],
-    [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
-    [[YYLTYPE *yylocationp], [yylocationp]]]))
+              [[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]))[

 {
 {

-  /* Pacify ``unused variable'' warnings.  */
-  (void) yyvaluep;
-b4_location_if([  (void) yylocationp;
-])dnl
-[
-  if (yytype < YYNTOKENS)
-    YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
-  else
-    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
-
-]b4_location_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
-  YYFPRINTF (yyoutput, ": ");
+  FILE *yyo = yyoutput;
+  YYUSE (yyo);
+  if (!yyvaluep)
+    return;
+]b4_locations_if([  YYUSE (yylocationp);

 ])dnl
 ])dnl

-[
-# ifdef YYPRINT
+b4_parse_param_use[]dnl
+[# ifdef YYPRINT

   if (yytype < YYNTOKENS)
     YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
   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:
 # endif
   switch (yytype)
     {
 ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [      default:

-        break;
+       break;

     }
     }

-  YYFPRINTF (yyoutput, ")");

 }
 }

+
+
+/*--------------------------------.
+| 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
+])
+
+## -------------- ##
+## Declarations.  ##
+## -------------- ##
+
+# b4_declare_yylstype
+# -------------------
+# Declarations that might either go into the header (if --defines) or
+# in the parser body.  Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
+m4_define([b4_declare_yylstype],
+[[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
+]m4_ifdef([b4_stype],
+[[typedef union ]b4_union_name[
+{
+]b4_user_stype[
+} ]b4_api_PREFIX[STYPE;
+# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
+[m4_if(b4_tag_seen_flag, 0,
+[[typedef int ]b4_api_PREFIX[STYPE;
+# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
+# define ]b4_api_prefix[stype ]b4_api_PREFIX[STYPE /* obsolescent; will be withdrawn */
+# define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
+#endif]b4_locations_if([[
+
+#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
+typedef struct ]b4_api_PREFIX[LTYPE
+{
+  int first_line;
+  int first_column;
+  int last_line;
+  int last_column;
+} ]b4_api_PREFIX[LTYPE;
+# define ]b4_api_prefix[ltype ]b4_api_PREFIX[LTYPE /* obsolescent; will be withdrawn */
+# define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
+# define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
+#endif]])
+
+b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
+]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
+])
+
+# b4_YYDEBUG_define
+# ------------------
+m4_define([b4_YYDEBUG_define],
+[[/* Enabling traces.  */
+]m4_if(b4_api_prefix, [yy],
+[[#ifndef YYDEBUG
+# define YYDEBUG ]b4_debug_flag[
+#endif]],
+[[#ifndef ]b4_api_PREFIX[DEBUG
+# if defined YYDEBUG
+#  if YYDEBUG
+#   define ]b4_api_PREFIX[DEBUG 1
+#  else
+#   define ]b4_api_PREFIX[DEBUG 0
+#  endif
+# else /* ! defined YYDEBUG */
+#  define ]b4_api_PREFIX[DEBUG ]b4_debug_flag[
+# endif /* ! defined YYDEBUG */
+#endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
+])
+
+# b4_declare_yydebug
+# ------------------
+m4_define([b4_declare_yydebug],
+[b4_YYDEBUG_define[
+#if ]b4_api_PREFIX[DEBUG
+extern int ]b4_prefix[debug;
+#endif][]dnl
+])
+
+# b4_yylloc_default_define
+# ------------------------
+# Define YYLLOC_DEFAULT.
+m4_define([b4_yylloc_default_define],
+[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+#ifndef YYLLOC_DEFAULT
+# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
+    do                                                                  \
+      if (YYID (N))                                                     \
+        {                                                               \
+          (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
+          (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
+          (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
+          (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).first_line   = (Current).last_line   =              \
+            YYRHSLOC (Rhs, 0).last_line;                                \
+          (Current).first_column = (Current).last_column =              \
+            YYRHSLOC (Rhs, 0).last_column;                              \
+        }                                                               \
+    while (YYID (0))
+#endif
+]])
+
+# b4_yy_location_print_define
+# ---------------------------
+# Define YY_LOCATION_PRINT.
+m4_define([b4_yy_location_print_define],
+[b4_locations_if([[
+/* YY_LOCATION_PRINT -- Print the location on the stream.
+   This macro was not mandated originally: define only if we know
+   we won't break user code: when these are the locations we know.  */
+
+#ifndef YY_LOCATION_PRINT
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+#  define YY_LOCATION_PRINT(File, Loc)                                   \
+  do {                                                                   \
+    fprintf (File, "%d.%d", (Loc).first_line, (Loc).first_column);       \
+    if ((Loc).first_line < (Loc).last_line)                              \
+      fprintf (File, "-%d.%d", (Loc).last_line,  (Loc).last_column - 1); \
+    else if ((Loc).first_column < (Loc).last_column - 1)                 \
+      fprintf (File, "-%d", (Loc).last_column - 1);                      \
+  } while (0)
+# else
+#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+# endif
+#endif]],
+[[/* This macro is provided for backward compatibility. */
+#ifndef YY_LOCATION_PRINT
+# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#endif]])
+])
+
+# b4_yyloc_default
+# ----------------
+# Expand to a possible default value for yylloc.
+m4_define([b4_yyloc_default],
+[[
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+  = { ]m4_join([, ],
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]),
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]))[ }
+# endif

 ]])
 ]])