Version 2.4.2.

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index c7c506368af8956cb7043629f098b9c2da4fce6d..e7308be301bc9764683cca526c4ecdcef2253d88 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -1,100 +1,97 @@
-m4_divert(-1)                                               -*- Autoconf -*-
+                                                            -*- Autoconf -*-

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

-# Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2010 Free Software Foundation, Inc.

 
 

-# This program is free software; you can redistribute it and/or modify
+# 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/>.

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

-# b4_copyright(TITLE, YEARS)
-# --------------------------
-m4_define([b4_copyright],
-[/* A Bison parser, made by GNU Bison b4_version.  */
-
-/* $1
-
-m4_text_wrap([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.
+# 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])

 
 

-   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.  */
+# 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  */])])

 
 

-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.

 
 

-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */])
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# 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.  */
 
 /* Bison version.  */

-[#]define YYBISON_VERSION "b4_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_flag
+#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],


@@ -105,9 +102,8 @@ 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)
 
 
 # b4_parse_param_for(DECL, FORMAL, BODY)


@@ -116,7 +112,7 @@ b4_parse_param))
 # the formal name to FORMAL, and evaluating the BODY.
 m4_define([b4_parse_param_for],
 [m4_foreach([$1_$2], m4_defn([b4_parse_param]),
 # 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_fst($1_$2))dnl
+[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_pushdef([$2], m4_shift($1_$2))dnl
 $3[]dnl
 m4_popdef([$2])dnl


@@ -131,18 +127,11 @@ m4_define([b4_parse_param_use],
 ])dnl
 ])
 
 ])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


@@ -167,47 +156,40 @@ m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
 [b4_int_type($1_min, $1_max)])
 
 

-## ------------------ ##
-## Decoding options.  ##
-## ------------------ ##
-
-# b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
-# -----------------------------------
-# Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
-m4_define([b4_flag_if],
-[m4_case(b4_$1_flag,
-         [0], [$3],
-        [1], [$2],
-        [m4_fatal([invalid $1 value: ]$1)])])
-
-
-# b4_define_flag_if(FLAG)
-# -----------------------
-# Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
-# value of the Boolean FLAG.
-m4_define([b4_define_flag_if],
-[_b4_define_flag_if($[1], $[2], [$1])])
+# 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[))]])])

 
 

-# _b4_define_flag_if($1, $2, FLAG)
-# --------------------------------
-# This macro works around the impossibility to define macros
-# inside macros, because issuing `[$1]' is not possible in M4 :(.
-# This sucks hard, GNU M4 should really provide M5 like $$1.
-m4_define([_b4_define_flag_if],
-[m4_if([$1$2], $[1]$[2], [],
-       [m4_fatal([$0: Invalid arguments: $@])])dnl
-m4_define([b4_$3_if], 
-          [b4_flag_if([$3], [$1], [$2])])])
+## ---------##
+## 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_FLAG_if(IF-TRUE, IF-FALSE)
-# -----------------------------
-# Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
-b4_define_flag_if([defines])        # Whether headers are requested.
-b4_define_flag_if([error_verbose])  # Wheter error are verbose.
-b4_define_flag_if([locations])      # Whether locations are tracked.
-b4_define_flag_if([pure])           # Whether the interface is pure.

 
 

+# 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
+])

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


@@ -218,7 +200,7 @@ b4_define_flag_if([pure])           # Whether the interface is pure.
 # -----------------------------------------
 # 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

 ])
 
 
 ])
 
 


@@ -226,7 +208,7 @@ m4_define([b4_token_define],
 # -------------------------------------------------------
 # Output the definition of the tokens (if there are) as #defines.
 m4_define([b4_token_defines],
 # -------------------------------------------------------
 # Output the definition of the tokens (if there are) as #defines.
 m4_define([b4_token_defines],

-[m4_if([$@], [[]], [],
+[m4_if([$#$1], [1], [],

 [/* Tokens.  */
 m4_map([b4_token_define], [$@])])
 ])
 [/* Tokens.  */
 m4_map([b4_token_define], [$@])])
 ])


@@ -236,14 +218,14 @@ m4_map([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_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -----------------------------------------------------
 # Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
 
 
 # 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([$@], [[]], [],
+[m4_if([$#$1], [1], [],

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


@@ -260,12 +242,28 @@ m4_map_sep([     b4_token_enum], [,
 
 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -------------------------------------------------------------
 
 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -------------------------------------------------------------

-# Output the definition of the tokens (if there are) as enums and #defines.
+# 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],
 m4_define([b4_token_enums_defines],

-[b4_token_enums($@)b4_token_defines($@)
+[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.  ##


@@ -294,8 +292,8 @@ m4_define([b4_c_function_def],
 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
 ])
 


@@ -305,7 +303,7 @@ 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

 ])
 
 
 ])
 
 


@@ -313,9 +311,8 @@ $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([$@],
-        [],   [void],
-        [[]], [void],
+[m4_if([$#], [0], [void],
+       [$#$1], [1], [void],

               [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
 
 m4_define([b4_c_ansi_formal],
               [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
 
 m4_define([b4_c_ansi_formal],


@@ -355,7 +352,7 @@ 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 ();


@@ -367,7 +364,7 @@ $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

 ])
 
 
 ])
 
 


@@ -382,7 +379,7 @@ 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

 ])
 
 
 ])
 
 


@@ -400,33 +397,22 @@ m4_define([b4_c_arg],
 ## Synclines.  ##
 ## ----------- ##
 
 ## Synclines.  ##
 ## ----------- ##
 

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

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

-m4_define([b4_syncline],
-[b4_flag_if([synclines], [[#]line $1 $2])])
-
+m4_define([b4_sync_start], [[#]line $1 $2])

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

-# 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_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(FUNCTION-DECLARATOR)
 
 
 # b4_yydestruct_generate(FUNCTION-DECLARATOR)


@@ -459,8 +445,8 @@ b4_parse_param_use[]dnl
 
   switch (yytype)
     {
 
   switch (yytype)
     {

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

        break;
     }
 }]dnl
        break;
     }
 }]dnl


@@ -483,8 +469,8 @@ m4_define_default([b4_yy_symbol_print_generate],
     [static void],
               [[FILE *yyoutput],                       [yyoutput]],
               [[int yytype],                           [yytype]],
     [static void],
               [[FILE *yyoutput],                       [yyoutput]],
               [[int yytype],                           [yytype]],

-              [[const YYSTYPE * const yyvaluep],       [yyvaluep]][]dnl
-b4_locations_if([, [[const YYLTYPE * const yylocationp], [yylocationp]]])[]dnl
+              [[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)
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   if (!yyvaluep)


@@ -500,7 +486,7 @@ b4_parse_param_use[]dnl
 # endif
   switch (yytype)
     {
 # endif
   switch (yytype)
     {

-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
+]b4_symbol_foreach([b4_symbol_printer])dnl

 [      default:
        break;
     }
 [      default:
        break;
     }


@@ -515,8 +501,8 @@ b4_parse_param_use[]dnl
     [static void],
               [[FILE *yyoutput],                       [yyoutput]],
               [[int yytype],                           [yytype]],
     [static void],
               [[FILE *yyoutput],                       [yyoutput]],
               [[int yytype],                           [yytype]],

-              [[const YYSTYPE * const yyvaluep],       [yyvaluep]][]dnl
-b4_locations_if([, [[const YYLTYPE * const yylocationp], [yylocationp]]])[]dnl
+              [[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)
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   if (yytype < YYNTOKENS)