When reducing initial empty rules, Bison parser read an initial

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index 261716225f07a203a07f9de89910ad0625dea487..209bb1a76a4a7a1be7cb51085efc4462539e32d1 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -26,7 +26,7 @@ m4_divert(-1)                                               -*- Autoconf -*-
 # b4_copyright(TITLE, YEARS)
 # --------------------------
 m4_define([b4_copyright],
-[/* A Bison parser, made from b4_filename, by GNU bison b4_version.  */
+[/* A Bison parser, made by GNU Bison b4_version.  */
 
 /* $1,
    Copyright (C) $2 Free Software Foundation, Inc.
@@ -54,7 +54,7 @@ m4_define([b4_identification],
 [#]define YYBISON 1
 
 /* Skeleton name.  */
-[#]define YYSKELETON_NAME "b4_skeleton"
+[#]define YYSKELETON_NAME b4_skeleton
 
 /* Pure parsers.  */
 [#]define YYPURE b4_pure
@@ -65,6 +65,14 @@ m4_define([b4_identification],
 
 
 
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+m4_define_default([b4_epilogue], [])
+
+
+
 ## ------------------------ ##
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##
@@ -300,3 +308,105 @@ m4_define([b4_c_args],
 
 m4_define([b4_c_arg],
 [$2])
+
+
+## ----------- ##
+## Synclines.  ##
+## ----------- ##
+
+
+# b4_syncline(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;
+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([b4_yydestruct_generate],
+[[/*-----------------------------------------------.
+| Release the memory associated to this symbol.  |
+`-----------------------------------------------*/
+
+]$1([yydestruct],
+    [static void],
+    [[int yytype],           [yytype]],
+    [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
+    [[YYLTYPE *yylocationp], [yylocationp]]]))[
+{
+  /* Pacify ``unused variable'' warnings.  */
+  (void) yyvaluep;
+]b4_location_if([  (void) yylocationp;
+])[
+  switch (yytype)
+    {
+]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
+      default:
+        break;
+    }
+}]dnl
+])
+
+
+# b4_yysymprint_generate(FUNCTION-DECLARATOR)
+# -------------------------------------------
+# Generate the "yysymprint" 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_yysymprint_generate],
+[[/*--------------------------------.
+| Print this symbol on YYOUTPUT.  |
+`--------------------------------*/
+
+]$1([yysymprint],
+    [static void],
+    [[FILE *yyoutput],       [yyoutput]],
+    [[int yytype],           [yytype]],
+    [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
+    [[YYLTYPE *yylocationp], [yylocationp]]]))
+{
+  /* Pacify ``unused variable'' warnings.  */
+  (void) yyvaluep;
+b4_location_if([  (void) yylocationp;
+])dnl
+
+  if (yytype < YYNTOKENS)
+    {
+      YYFPRINTF (yyoutput, "token %s (", yytname[[yytype]]);
+# ifdef YYPRINT
+      YYPRINT (yyoutput, yytoknum[[yytype]], *yyvaluep);
+# endif
+    }
+  else
+    YYFPRINTF (yyoutput, "nterm %s (", yytname[[yytype]]);
+
+  switch (yytype)
+    {
+m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
+      default:
+        break;
+    }
+  YYFPRINTF (yyoutput, ")");
+}
+])