X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/e3f12e0818baab3e61dd30270c54def9ac2f2ad4..3fd1d6b2f36722c64f8db77400c6f6a2639ebae0:/data/c.m4

diff --git a/data/c.m4 b/data/c.m4
index 00209828..89ad4fd1 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -30,19 +30,21 @@ m4_define([b4_tocpp],
 # ------------------
 # A valid C macro name to use as a CPP header guard for FILE.
 m4_define([b4_cpp_guard],
-[b4_tocpp(m4_defn([b4_prefix])/[$1])])
+[[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])
 
 
 # b4_cpp_guard_open(FILE)
 # b4_cpp_guard_close(FILE)
 # ------------------------
-# Open/close CPP inclusion guards for 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])])
+# define b4_cpp_guard([$1])])])
 
 m4_define([b4_cpp_guard_close],
-[#endif b4_comment([!b4_cpp_guard([$1])])])
+[m4_ifval(m4_quote($1),
+[#endif b4_comment([!b4_cpp_guard([$1])])])])
 
 
 ## ---------------- ##
@@ -56,20 +58,17 @@ m4_define([b4_cpp_guard_close],
 # 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], [
+m4_define([b4_comment_],
+[$2[]m4_bpatsubst(m4_expand([$1]), [
 \(.\)], [
 $3\1])$4])
 
 
 # b4_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.
+# Put TEXT in comment.  Prefix all the output lines with PREFIX.
 m4_define([b4_comment],
-[b4_comment_([$1], [$2/* ], [$2   ], [$2  */])])
+[b4_comment_([$1], [$2/* ], [$2   ], [  */])])
 
 
 # b4_identification
@@ -195,13 +194,12 @@ m4_define([b4_int_type_for],
 # --------------------------------------------
 # 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.
+# TABLE_min and TABLE_max defined.
 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[))]])])
+       [[0]],
+       [(!!(($2) == ($3)))])])
 
 
 ## ---------##
@@ -272,11 +270,9 @@ m4_define([b4_token_enum],
 # --------------
 # Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
-[b4_any_token_visible_if([[/* Tokens.  */
+[b4_any_token_visible_if([[/* Token type.  */
 #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.  */
   enum ]b4_api_prefix[tokentype
   {
     ]m4_join([,
@@ -415,7 +411,6 @@ m4_define_default([b4_yydestruct_define],
 | Release the memory associated to this symbol.  |
 `-----------------------------------------------*/
 
-/*ARGSUSED*/
 ]b4_function_define([yydestruct],
     [static void],
     [[const char *yymsg],    [yymsg]],
@@ -448,7 +443,6 @@ m4_define_default([b4_yy_symbol_print_define],
 | Print this symbol on YYOUTPUT.  |
 `--------------------------------*/
 
-/*ARGSUSED*/
 ]b4_function_define([yy_symbol_value_print],
     [static void],
                [[FILE *yyoutput],                       [yyoutput]],
@@ -507,44 +501,62 @@ b4_locations_if([, yylocationp])[]b4_user_args[);
 ## 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
+# b4_value_type_define
+# --------------------
+m4_define([b4_value_type_define],
+[[/* Value type.  */
+#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
 ]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
+[[typedef union ]b4_union_name[ ]b4_api_PREFIX[STYPE;
+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_IS_DECLARED 1
-#endif]b4_locations_if([[
+#endif
+]])
+
 
+# b4_location_type_define
+# -----------------------
+m4_define([b4_location_type_define],
+[[/* Location type.  */
 #if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
-typedef struct ]b4_api_PREFIX[LTYPE
+typedef struct ]b4_api_PREFIX[LTYPE ]b4_api_PREFIX[LTYPE;
+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_IS_DECLARED 1
 # define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
-#endif]])
+#endif
+]])
+
+
+# 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],
+[b4_value_type_define[]b4_locations_if([
+b4_location_type_define])
 
 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.  */
+[[/* Debug traces.  */
 ]m4_if(b4_api_prefix, [yy],
 [[#ifndef YYDEBUG
 # define YYDEBUG ]b4_parse_trace_if([1], [0])[
@@ -558,7 +570,7 @@ m4_define([b4_YYDEBUG_define],
 #  endif
 # else /* ! defined YYDEBUG */
 #  define ]b4_api_PREFIX[DEBUG ]b4_parse_trace_if([1], [0])[
-# endif /* ! defined ]b4_api_PREFIX[DEBUG */
+# endif /* ! defined YYDEBUG */
 #endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
 ])
 
@@ -582,7 +594,7 @@ m4_define([b4_yylloc_default_define],
 #ifndef YYLLOC_DEFAULT
 # define YYLLOC_DEFAULT(Current, Rhs, N)                                \
     do                                                                  \
-      if (YYID (N))                                                     \
+      if (N)                                                            \
         {                                                               \
           (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
           (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
@@ -596,6 +608,75 @@ m4_define([b4_yylloc_default_define],
           (Current).first_column = (Current).last_column =              \
             YYRHSLOC (Rhs, 0).last_column;                              \
         }                                                               \
-    while (YYID (0))
+    while (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
+
+/* Print *YYLOCP on YYO.  Private, do not rely on its existence. */
+
+__attribute__((__unused__))
+]b4_function_define([yy_location_print_],
+    [static unsigned],
+               [[FILE *yyo],                    [yyo]],
+               [[YYLTYPE const * const yylocp], [yylocp]])[
+{
+  unsigned res = 0;
+  int end_col = 0 != yylocp->last_column ? yylocp->last_column - 1 : 0;
+  if (0 <= yylocp->first_line)
+    {
+      res += fprintf (yyo, "%d", yylocp->first_line);
+      if (0 <= yylocp->first_column)
+        res += fprintf (yyo, ".%d", yylocp->first_column);
+    }
+  if (0 <= yylocp->last_line)
+    {
+      if (yylocp->first_line < yylocp->last_line)
+        {
+          res += fprintf (yyo, "-%d", yylocp->last_line);
+          if (0 <= end_col)
+            res += fprintf (yyo, ".%d", end_col);
+        }
+      else if (0 <= end_col && yylocp->first_column < end_col)
+        res += fprintf (yyo, "-%d", end_col);
+    }
+  return res;
+ }
+
+#  define YY_LOCATION_PRINT(File, Loc)                                   \
+  yy_location_print_ (File, &(Loc))
+
+# 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
+]])