grammar: warn about unused precedence for symbols

[bison.git] / src / scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index b315951cacb85e936dcd40ab3e1801b8e880c9a9..c7e7190f034949ccc36c8cb1fed10cb76b6cc29d 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,7 +1,6 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
 
 /* Scan Bison Skeletons.                                       -*- C -*-
 

-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
-   Foundation, Inc.
+   Copyright (C) 2001-2013 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -18,7 +17,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 

-%option nodefault noyywrap nounput never-interactive debug
+%option nodefault noyywrap noinput nounput never-interactive debug

 %option prefix="skel_" outfile="lex.yy.c"
 
 %{
 %option prefix="skel_" outfile="lex.yy.c"
 
 %{


@@ -42,12 +41,11 @@
 #define YY_DECL static int skel_lex (void)
 YY_DECL;
 
 #define YY_DECL static int skel_lex (void)
 YY_DECL;
 

-#define QPUTS(String) \
-   fputs (quotearg_style (c_quoting_style, String), yyout)
-
-static void at_directive_perform (int at_directive_argc,
-                                  char *at_directive_argv[],
-                                  char **outnamep, int *out_linenop);
+typedef void (*at_directive)(int, char**, char **, int*);
+static void at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun);
+static void at_basename (int argc, char *argv[], char**, int*);
+static void at_complain (int argc, char *argv[], char**, int*);
+static void at_output (int argc, char *argv[], char **name, int *lineno);

 static void fail_for_at_directive_too_many_args (char const *at_directive_name);
 static void fail_for_at_directive_too_few_args (char const *at_directive_name);
 static void fail_for_invalid_at (char const *at);
 static void fail_for_at_directive_too_many_args (char const *at_directive_name);
 static void fail_for_at_directive_too_few_args (char const *at_directive_name);
 static void fail_for_invalid_at (char const *at);


@@ -59,96 +57,100 @@ static void fail_for_invalid_at (char const *at);
 %%
 
 %{
 %%
 
 %{

-  int out_lineno IF_LINT (= 0);
-  char *outname = NULL;
-
-  /* Currently, only the @warn, @complain, @fatal, @warn_at, @complain_at, and
-     @fatal_at directives take multiple arguments, and the last three already
-     can't take more than 7.  at_directive_argv[0] is the directive name.  */
-  #define AT_DIRECTIVE_ARGC_MAX 8
-  int at_directive_argc = 0;
-  char *at_directive_argv[AT_DIRECTIVE_ARGC_MAX];
+  int out_lineno PACIFY_CC (= 0);
+  char *out_name = NULL;
+
+  /* Currently, only the @complain directive takes multiple arguments, and
+     never more than 7, with argv[0] being the directive name and argv[1]
+     being the type of complaint to dispatch. */
+#define ARGC_MAX 9
+  int argc = 0;
+  char *argv[ARGC_MAX];
+  at_directive at_ptr = NULL;

 %}
 
 "@@" fputc ('@', yyout);
 "@{" fputc ('[', yyout);
 "@}" fputc (']', yyout);
 %}
 
 "@@" fputc ('@', yyout);
 "@{" fputc ('[', yyout);
 "@}" fputc (']', yyout);

-"@`" /* Emtpy.  Used by b4_cat in ../data/bison.m4.  */
-@\n  /* Likewise.  */
+"@`" continue;  /* Used by b4_cat in ../data/bison.m4.  */
+@\n  continue;

 
 "@oline@"  fprintf (yyout, "%d", out_lineno + 1);
 
 "@oline@"  fprintf (yyout, "%d", out_lineno + 1);

-"@ofile@"  QPUTS (outname);
-"@dir_prefix@" QPUTS (dir_prefix);
+"@ofile@"  fputs (quotearg_style (c_quoting_style, out_name), yyout);

 
 

-@[a-z_]+"(" {
-  yytext[yyleng-1] = '\0';
-  obstack_grow (&obstack_for_string, yytext, yyleng);
-  at_directive_argv[at_directive_argc++] =
-    obstack_finish (&obstack_for_string);
-  BEGIN SC_AT_DIRECTIVE_ARGS;
-}
+"@basename("    at_init (&argc, argv, &at_ptr, &at_basename);
+"@complain("    at_init (&argc, argv, &at_ptr, &at_complain);
+"@output("      at_init (&argc, argv, &at_ptr, &at_output);

 
   /* This pattern must not match more than the previous @ patterns. */
 
   /* This pattern must not match more than the previous @ patterns. */

-@[^@{}`(\n]* fail_for_invalid_at (yytext);
-\n        out_lineno++; ECHO;
-[^@\n]+           ECHO;
+@[^@{}`(\n]*    fail_for_invalid_at (yytext);
+\n              out_lineno++; ECHO;
+[^@\n]+         ECHO;

 
 <INITIAL><<EOF>> {
 
 <INITIAL><<EOF>> {

-  if (outname)
+  if (out_name)

     {
     {

-      free (outname);
+      free (out_name);

       xfclose (yyout);
     }
   return EOF;
 }
 
       xfclose (yyout);
     }
   return EOF;
 }
 

-<SC_AT_DIRECTIVE_ARGS>{
-  [^@]+ { STRING_GROW; }
+<SC_AT_DIRECTIVE_ARGS>
+{
+  [^@]+  STRING_GROW;

 
 

-  "@@" { obstack_1grow (&obstack_for_string, '@'); }
-  "@{" { obstack_1grow (&obstack_for_string, '['); }
-  "@}" { obstack_1grow (&obstack_for_string, ']'); }
-  "@`" /* Emtpy.  Useful for starting an argument
-          that begins with whitespace. */
-  @\n  /* Empty.  */
+  "@@"   obstack_1grow (&obstack_for_string, '@');
+  "@{"   obstack_1grow (&obstack_for_string, '[');
+  "@}"   obstack_1grow (&obstack_for_string, ']');
+  "@`"   continue; /* For starting an argument that begins with whitespace. */
+  @\n    continue;

 
   @[,)] {
 
   @[,)] {

-    if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
-      fail_for_at_directive_too_many_args (at_directive_argv[0]);
+    if (argc >= ARGC_MAX)
+      fail_for_at_directive_too_many_args (argv[0]);

 
 

-    obstack_1grow (&obstack_for_string, '\0');
-    at_directive_argv[at_directive_argc++] =
-      obstack_finish (&obstack_for_string);
+    argv[argc++] = obstack_finish0 (&obstack_for_string);

 
     /* Like M4, skip whitespace after a comma.  */
     if (yytext[1] == ',')
       BEGIN SC_AT_DIRECTIVE_SKIP_WS;
     else
       {
 
     /* Like M4, skip whitespace after a comma.  */
     if (yytext[1] == ',')
       BEGIN SC_AT_DIRECTIVE_SKIP_WS;
     else
       {

-        at_directive_perform (at_directive_argc, at_directive_argv,
-                              &outname, &out_lineno);
-        obstack_free (&obstack_for_string, at_directive_argv[0]);
-        at_directive_argc = 0;
+        aver (at_ptr);
+        at_ptr (argc, argv, &out_name, &out_lineno);
+        obstack_free (&obstack_for_string, argv[0]);
+        argc = 0;

         BEGIN INITIAL;
       }
   }
 
         BEGIN INITIAL;
       }
   }
 

-  @.? { fail_for_invalid_at (yytext); }
+  @.?  fail_for_invalid_at (yytext);

 }
 
 }
 

-<SC_AT_DIRECTIVE_SKIP_WS>{
-  [ \t\r\n]
-  . { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
+<SC_AT_DIRECTIVE_SKIP_WS>
+{
+  [ \t\r\n]    continue;
+  .            yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS;

 }
 
 }
 

-<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
-  <<EOF>> {
-    fatal (_("unclosed %s directive in skeleton"), at_directive_argv[0]);
-  }
+<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>
+{
+  <<EOF>>  complain (NULL, fatal, _("unclosed %s directive in skeleton"), argv[0]);

 }
 
 %%
 
 }
 
 %%
 

+static void
+at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun)
+{
+  *at_ptr = fun;
+  yytext[yyleng-1] = '\0';
+  obstack_grow (&obstack_for_string, yytext, yyleng);
+  argv[(*argc)++] = obstack_finish (&obstack_for_string);
+  BEGIN SC_AT_DIRECTIVE_ARGS;
+}
+

 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/
 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/


@@ -175,132 +177,92 @@ skel_scanner_free (void)
   yylex_destroy ();
 }
 
   yylex_destroy ();
 }
 

-static
-void at_directive_perform (int at_directive_argc,
-                           char *at_directive_argv[],
-                           char **outnamep, int *out_linenop)
+static inline warnings
+flag (const char *arg)

 {
 {

-  if (0 == strcmp (at_directive_argv[0], "@basename"))
-    {
-      if (at_directive_argc > 2)
-        fail_for_at_directive_too_many_args (at_directive_argv[0]);
-      fputs (last_component (at_directive_argv[1]), yyout);
-    }
-  else if (0 == strcmp (at_directive_argv[0], "@warn")
-           || 0 == strcmp (at_directive_argv[0], "@complain")
-           || 0 == strcmp (at_directive_argv[0], "@fatal"))
-    {
-      void (*func)(char const *, ...);
-      switch (at_directive_argv[0][1])
-        {
-          case 'w': func = warn; break;
-          case 'c': func = complain; break;
-          case 'f': func = fatal; break;
-          default: aver (false); break;
-        }
-      switch (at_directive_argc)
-        {
-          case 2:
-            func (_(at_directive_argv[1]));
-            break;
-          case 3:
-            func (_(at_directive_argv[1]), at_directive_argv[2]);
-            break;
-          case 4:
-            func (_(at_directive_argv[1]), at_directive_argv[2],
-                  at_directive_argv[3]);
-            break;
-          case 5:
-            func (_(at_directive_argv[1]), at_directive_argv[2],
-                  at_directive_argv[3], at_directive_argv[4]);
-            break;
-          case 6:
-            func (_(at_directive_argv[1]), at_directive_argv[2],
-                  at_directive_argv[3], at_directive_argv[4],
-                  at_directive_argv[5]);
-            break;
-          default:
-            fail_for_at_directive_too_many_args (at_directive_argv[0]);
-            break;
-        }
-    }
-  else if (0 == strcmp (at_directive_argv[0], "@warn_at")
-           || 0 == strcmp (at_directive_argv[0], "@complain_at")
-           || 0 == strcmp (at_directive_argv[0], "@fatal_at"))
+  /* compare with values issued from b4_error */
+  if (STREQ (arg, "complain"))
+    return complaint;
+  else if (STREQ (arg, "fatal"))
+    return fatal;
+  else if (STREQ (arg, "note"))
+    return silent | complaint | no_caret;
+  else if (STREQ (arg, "warn"))
+    return Wother;
+  else
+    aver (false);
+}
+
+static void
+at_basename (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  (void) out_namep;
+  (void) out_linenop;
+  if (2 < argc)
+    fail_for_at_directive_too_many_args (argv[0]);
+  fputs (last_component (argv[1]), yyout);
+}
+
+static void
+at_complain (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  static unsigned indent;
+  warnings w = flag (argv[1]);
+  location loc;
+  location *locp = NULL;
+
+  (void) out_namep;
+  (void) out_linenop;
+
+  if (argc < 4)
+    fail_for_at_directive_too_few_args (argv[0]);
+  if (argv[2] && argv[2][0])

     {
     {

-      void (*func)(location, char const *, ...);
-      location loc;
-      if (at_directive_argc < 4)
-        fail_for_at_directive_too_few_args (at_directive_argv[0]);
-      switch (at_directive_argv[0][1])
-        {
-          case 'w': func = warn_at; break;
-          case 'c': func = complain_at; break;
-          case 'f': func = fatal_at; break;
-          default: aver (false); break;
-        }
-      boundary_set_from_string (&loc.start, at_directive_argv[1]);
-      boundary_set_from_string (&loc.end, at_directive_argv[2]);
-      switch (at_directive_argc)
-        {
-          case 4:
-            func (loc, _(at_directive_argv[3]));
-            break;
-          case 5:
-            func (loc, _(at_directive_argv[3]), at_directive_argv[4]);
-            break;
-          case 6:
-            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
-                  at_directive_argv[5]);
-            break;
-          case 7:
-            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
-                  at_directive_argv[5], at_directive_argv[6]);
-            break;
-          case 8:
-            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
-                  at_directive_argv[5], at_directive_argv[6],
-                  at_directive_argv[7]);
-            break;
-          default:
-            fail_for_at_directive_too_many_args (at_directive_argv[0]);
-            break;
-        }
+      boundary_set_from_string (&loc.start, argv[2]);
+      boundary_set_from_string (&loc.end, argv[3]);
+      locp = &loc;

     }
     }

-  else if (0 == strcmp (at_directive_argv[0], "@output"))
+  if (w & silent)
+    indent += SUB_INDENT;
+  else
+    indent = 0;
+  complain_args (locp, w, &indent, argc - 4, argv + 4);
+  if (w & silent)
+    indent -= SUB_INDENT;
+}
+
+static void
+at_output (int argc, char *argv[], char **out_namep, int *out_linenop)
+{
+  if (2 < argc)
+    fail_for_at_directive_too_many_args (argv[0]);
+  if (*out_namep)

     {
     {

-      if (at_directive_argc > 2)
-        fail_for_at_directive_too_many_args (at_directive_argv[0]);
-      if (*outnamep)
-        {
-          free (*outnamep);
-          xfclose (yyout);
-        }
-      *outnamep = xstrdup (at_directive_argv[1]);
-      output_file_name_check (*outnamep);
-      yyout = xfopen (*outnamep, "w");
-      *out_linenop = 1;
+      free (*out_namep);
+      xfclose (yyout);

     }
     }

-  else
-    fail_for_invalid_at (at_directive_argv[0]);
+  *out_namep = xstrdup (argv[1]);
+  output_file_name_check (out_namep);
+  yyout = xfopen (*out_namep, "w");
+  *out_linenop = 1;

 }
 
 static void
 fail_for_at_directive_too_few_args (char const *at_directive_name)
 {
 }
 
 static void
 fail_for_at_directive_too_few_args (char const *at_directive_name)
 {

-  fatal (_("too few arguments for %s directive in skeleton"),
-         at_directive_name);
+  complain (NULL, fatal, _("too few arguments for %s directive in skeleton"),
+            at_directive_name);

 }
 
 static void
 fail_for_at_directive_too_many_args (char const *at_directive_name)
 {
 }
 
 static void
 fail_for_at_directive_too_many_args (char const *at_directive_name)
 {

-  fatal (_("too many arguments for %s directive in skeleton"),
-         at_directive_name);
+  complain (NULL, fatal, _("too many arguments for %s directive in skeleton"),
+            at_directive_name);

 }
 
 static void
 fail_for_invalid_at (char const *at)
 {
 }
 
 static void
 fail_for_invalid_at (char const *at)
 {

-  fatal ("invalid @ in skeleton: %s", at);
+  complain (NULL, fatal, "invalid @ in skeleton: %s", at);

 }
 }