doc: discuss named references after locations.

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index dcc0f1770bbbd71a259930498cf92eff616143dc..7a718a1dd8eef7cb56069d17d6b9846e12d61fb8 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,83 +1,98 @@
-m4_divert(-1)                                               -*- Autoconf -*-
+                                                            -*- Autoconf -*-

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

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

 
 

-# This program is free software; you can redistribute it and/or modify
+# Copyright (C) 2002, 2004-2011 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
 # 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., 59 Temple Place, Suite 330, Boston, MA
-# 02111-1307  USA
-
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

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

-# b4_copyright(TITLE, YEARS)
+# b4_comment_(TEXT, OPEN, CONTINUE, END)
+# -------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([b4_comment_], [$2[]m4_bpatsubst([$1], [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_c_comment(TEXT, [PREFIX])
+# ----------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from "/*".  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([b4_c_comment],
+[b4_comment_([$1], [$2/* ], [$2   ], [$2  */])])
+
+
+# b4_comment(TEXT, [PREFIX])

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

-m4_define([b4_copyright],
-[/* A Bison parser, made by GNU Bison b4_version.  */
-
-/* $1,
-   Copyright (C) $2 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */])
+# By default, C comments.
+m4_define([b4_comment], [b4_c_comment($@)])

 
 
 # 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])[

 
 

+/* Using locations.  */
+#define YYLSP_NEEDED ]b4_locations_if([1], [0])[
+]])

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

-m4_define_default([b4_epilogue], [])
-
+# 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.  ##
 ## ------------------------ ##
 
 
 ## ------------------------ ##
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##
 

-

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


@@ -88,24 +103,36 @@ 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


@@ -114,12 +141,12 @@ m4_define([b4_int_type],
 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
        b4_ints_in($@,   [-128],   [127]), [1], [signed char],
 
 [m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
        b4_ints_in($@,   [-128],   [127]), [1], [signed char],
 

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

 
        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)


@@ -130,28 +157,40 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
 [b4_int_type($1_min, $1_max)])
 
 

-## ------------------ ##
-## Decoding options.  ##
-## ------------------ ##
-
-
-# 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_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_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_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])
+
+
+# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)
+# -------------------------------------------------------------
+# Define "yy<TABLE-NAME>" which contents is CONTENT.
+m4_define([b4_integral_parser_table_define],
+[m4_ifval([$3], [b4_c_comment([$3], [  ])
+])dnl
+static const b4_int_type_for([$2]) yy$1[[]] =
+{
+  $2
+};dnl
+])

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


@@ -162,7 +201,17 @@ m4_define([b4_pure_if],
 # -----------------------------------------
 # Output the definition of this token as #define.
 m4_define([b4_token_define],
 # -----------------------------------------
 # Output the definition of this token as #define.
 m4_define([b4_token_define],

-[#define $1 $2
+[#define b4_percent_define_get([api.tokens.prefix])$1 $2
+])
+
+
+# b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
+# -------------------------------------------------------
+# Output the definition of the tokens (if there are) as #defines.
+m4_define([b4_token_defines],
+[m4_if([$#$1], [1], [],
+[/* Tokens.  */
+m4_map([b4_token_define], [$@])])

 ])
 
 
 ])
 
 


@@ -170,14 +219,14 @@ m4_define([b4_token_define],
 # ---------------------------------------
 # Output the definition of this token as an enum.
 m4_define([b4_token_enum],
 # ---------------------------------------
 # Output the definition of this token as an enum.
 m4_define([b4_token_enum],

-[$1 = $2])
+[b4_percent_define_get([api.tokens.prefix])$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([$@], [[]], [],
+# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
+# -----------------------------------------------------
+# Output the definition of the tokens (if there are) as enums.
+m4_define([b4_token_enums],
+[m4_if([$#$1], [1], [],

 [/* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
 [/* Tokens.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE


@@ -186,30 +235,66 @@ m4_define([b4_token_defines],
    enum yytokentype {
 m4_map_sep([     b4_token_enum], [,
 ],
    enum yytokentype {
 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($@)], [])

 ])
 
 
 ])
 
 

+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+# b4_symbol_value(VAL, [TYPE])
+# ----------------------------
+# Given a semantic value VAL ($$, $1 etc.), extract its value of type
+# TYPE if TYPE is given, otherwise just return VAL.  The result can be
+# used safetly, it is put in parens to avoid nasty precedence issues.
+# TYPE is *not* put in braces, provide some if needed.
+m4_define([b4_symbol_value],
+[($1[]m4_ifval([$2], [.$2]))])
+
+

 
 ## --------------------------------------------- ##
 ## Defining C functions in both K&R and ANSI-C.  ##
 ## --------------------------------------------- ##
 
 
 
 ## --------------------------------------------- ##
 ## 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],
 # 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 +304,7 @@ 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 +312,9 @@ $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 +335,9 @@ 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 +353,7 @@ 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 b4_c_modern

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


@@ -281,7 +365,7 @@ $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 +380,7 @@ 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

 ])
 
 
 ])
 
 


@@ -314,99 +398,133 @@ 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])])
-
-
-# b4_symbol_actions(FILENAME, LINENO,
-#                   SYMBOL-TAG, SYMBOL-NUM,
-#                   SYMBOL-ACTION, SYMBOL-TYPENAME)
-# -------------------------------------------------
-m4_define([b4_symbol_actions],
-[m4_pushdef([b4_dollar_dollar], [yyvaluep->$6])dnl
-m4_pushdef([b4_at_dollar], [(*yylocationp)])dnl
-      case $4: /* $3 */
-b4_syncline([$2], [$1])
-        $5;
+m4_define([b4_sync_start], [[#]line $1 $2])
+
+
+## -------------- ##
+## User actions.  ##
+## -------------- ##
+
+# b4_case(LABEL, STATEMENTS)
+# --------------------------
+m4_define([b4_case],
+[  case $1:
+$2

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

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

 
 
 
 

-# b4_yydestruct_generate(FUNTION-DECLARATOR)
-# ------------------------------------------
+# b4_predicate_case(LABEL, CONDITIONS)
+# ------------------------------------
+m4_define([b4_predicate_case],
+[  case $1:
+    if (! ($2)) YYERROR;
+b4_syncline([@oline@], [@ofile@])
+    break;])
+
+
+# b4_yydestruct_generate(FUNCTION-DECLARATOR)
+# -------------------------------------------

 # Generate the "yydestruct" function, which declaration is issued using
 # Generate the "yydestruct" function, which declaration is issued using

-# FUNTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
+# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C

 # or "b4_c_function_def" for K&R.
 # 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],
 ]$1([yydestruct],
     [static void],

+    [[const char *yymsg],    [yymsg]],

     [[int yytype],           [yytype]],
     [[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);
+

   switch (yytype)
     {
   switch (yytype)
     {

-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
-      default:
-        break;
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[      default:
+       break;

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

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

-m4_define([b4_yysymprint_generate],
-[[/*-----------------------------.
-| Print this symbol on YYOUT.  |
-`-----------------------------*/
-
-]$1([yysymprint],
+m4_define_default([b4_yy_symbol_print_generate],
+[[
+/*--------------------------------.
+| Print this symbol on YYOUTPUT.  |
+`--------------------------------*/
+
+/*ARGSUSED*/
+]$1([yy_symbol_value_print],

     [static void],
     [static void],

-    [[FILE *yyout],          [yyout]],
-    [[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;
+  if (!yyvaluep)
+    return;
+]b4_locations_if([  YYUSE (yylocationp);

 ])dnl
 ])dnl

-
+b4_parse_param_use[]dnl
+[# ifdef YYPRINT

   if (yytype < YYNTOKENS)
   if (yytype < YYNTOKENS)

-    {
-      YYFPRINTF (yyout, "token %s (", yytname[[yytype]]);
-# ifdef YYPRINT
-      YYPRINT (yyout, yytoknum[[yytype]], *yyvaluep);
+    YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
+# else
+  YYUSE (yyoutput);

 # endif
 # endif

-    }
-  else
-    YYFPRINTF (yyout, "nterm %s (", yytname[[yytype]]);
-

   switch (yytype)
     {
   switch (yytype)
     {

-m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
-      default:
-        break;
+]b4_symbol_foreach([b4_symbol_printer])dnl
+[      default:
+       break;

     }
     }

-  YYFPRINTF (yyout, ")");

 }
 }

+
+
+/*--------------------------------.
+| 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

 ])
 ])