* etc/.cvsignore: New.

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

diff --git a/src/scan-code.l b/src/scan-code.l
index 471b2a452f16173fed75d375c76b79eb1492ad79..0a338b4e6fac23569cdfc5e9d2b336c9fb2881f8 100644 (file)
--- a/src/scan-code.l
+++ b/src/scan-code.l
@@ -24,20 +24,17 @@
 %option prefix="code_" outfile="lex.yy.c"
 
 %{
 %option prefix="code_" outfile="lex.yy.c"
 
 %{

-#include <config.h>
-#include "system.h"
-

 /* Work around a bug in flex 2.5.31.  See Debian bug 333231
    <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.  */
 #undef code_wrap
 #define code_wrap() 1
 
 #define FLEX_PREFIX(Id) code_ ## Id
 /* Work around a bug in flex 2.5.31.  See Debian bug 333231
    <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.  */
 #undef code_wrap
 #define code_wrap() 1
 
 #define FLEX_PREFIX(Id) code_ ## Id

-#include "complain.h"

 #include "flex-scanner.h"
 #include "flex-scanner.h"

+
+#include "complain.h"

 #include "reader.h"
 #include "getargs.h"
 #include "reader.h"
 #include "getargs.h"

-#include <assert.h>

 #include <get-errno.h>
 #include <quote.h>
 
 #include <get-errno.h>
 #include <quote.h>
 


@@ -45,7 +42,7 @@
 
 /* The current calling start condition: SC_RULE_ACTION or
    SC_SYMBOL_ACTION. */
 
 /* The current calling start condition: SC_RULE_ACTION or
    SC_SYMBOL_ACTION. */

-# define YY_DECL const char *code_lex (int sc_context, symbol_list *rule)
+# define YY_DECL char *code_lex (int sc_context, symbol_list *rule)

 YY_DECL;
 
 #define YY_USER_ACTION  location_compute (loc, &loc->end, yytext, yyleng);
 YY_DECL;
 
 #define YY_USER_ACTION  location_compute (loc, &loc->end, yytext, yyleng);


@@ -55,6 +52,9 @@ static void handle_action_dollar (symbol_list *rule, char *cp,
 static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
 static location the_location;
 static location *loc = &the_location;
 static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
 static location the_location;
 static location *loc = &the_location;

+
+/* True if an untyped $$ or $n was seen.  */
+static bool untyped_var_seen;

 %}
  /* C and C++ comments in code. */
 %x SC_COMMENT SC_LINE_COMMENT
 %}
  /* C and C++ comments in code. */
 %x SC_COMMENT SC_LINE_COMMENT


@@ -78,14 +78,14 @@ splice       (\\[ \f\t\v]*\n)*
 
 %{
   /* Nesting level of the current code in braces.  */
 
 %{
   /* Nesting level of the current code in braces.  */

-  int braces_level IF_LINT (= 0);
+  int braces_level = 0;

 
   /* This scanner is special: it is invoked only once, henceforth
      is expected to return only once.  This initialization is
      therefore done once per action to translate. */
 
   /* This scanner is special: it is invoked only once, henceforth
      is expected to return only once.  This initialization is
      therefore done once per action to translate. */

-  assert (sc_context == SC_SYMBOL_ACTION
-         || sc_context == SC_RULE_ACTION
-         || sc_context == INITIAL);
+  aver (sc_context == SC_SYMBOL_ACTION
+       || sc_context == SC_RULE_ACTION
+       || sc_context == INITIAL);

   BEGIN sc_context;
 %}
 
   BEGIN sc_context;
 %}
 


@@ -262,48 +262,62 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
        ++cp;
       *cp = '\0';
       ++cp;
        ++cp;
       *cp = '\0';
       ++cp;

+      if (untyped_var_seen)
+       complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+      tag_seen = true;

     }
 
   if (*cp == '$')
     {
       if (!type_name)
        type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
     }
 
   if (*cp == '$')
     {
       if (!type_name)
        type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);

-      if (!type_name && typed)
-       {
-        if (rule->midrule_parent_rule)
-          complain_at (dollar_loc,
-                       _("$$ for the midrule at $%d of `%s' has no declared"
-                         " type"),
-                       rule->midrule_parent_rhs_index,
-                       effective_rule->sym->tag);
-        else
-          complain_at (dollar_loc, _("$$ of `%s' has no declared type"),
-                       rule->sym->tag);
-       }
+

       if (!type_name)
       if (!type_name)

-       type_name = "";
+       {
+         if (union_seen | tag_seen)
+           {
+             if (rule->midrule_parent_rule)
+               complain_at (dollar_loc,
+                            _("$$ for the midrule at $%d of `%s'"
+                              " has no declared type"),
+                            rule->midrule_parent_rhs_index,
+                            effective_rule->content.sym->tag);
+             else
+               complain_at (dollar_loc, _("$$ of `%s' has no declared type"),
+                            rule->content.sym->tag);
+           }
+         else
+           untyped_var_seen = true;
+         type_name = "";
+       }
+

       obstack_fgrow1 (&obstack_for_string,
                      "]b4_lhs_value([%s])[", type_name);
       rule->used = true;
     }
   else
     {
       obstack_fgrow1 (&obstack_for_string,
                      "]b4_lhs_value([%s])[", type_name);
       rule->used = true;
     }
   else
     {

-      long int num;
-      set_errno (0);
-      num = strtol (cp, 0, 10);
-      if (INT_MIN <= num && num <= effective_rule_length && ! get_errno ())
+      long int num = strtol (cp, NULL, 10);
+
+      if (1 - INT_MAX + effective_rule_length <= num
+         && num <= effective_rule_length)

        {
          int n = num;
        {
          int n = num;

-         if (1-n > max_left_semantic_context)
-           max_left_semantic_context = 1-n;
-         if (!type_name && n > 0)
+         if (max_left_semantic_context < 1 - n)
+           max_left_semantic_context = 1 - n;
+         if (!type_name && 0 < n)

            type_name =
              symbol_list_n_type_name_get (effective_rule, dollar_loc, n);
            type_name =
              symbol_list_n_type_name_get (effective_rule, dollar_loc, n);

-         if (!type_name && typed)
-           complain_at (dollar_loc, _("$%d of `%s' has no declared type"),
-                        n, effective_rule->sym->tag);

          if (!type_name)
          if (!type_name)

-           type_name = "";
+           {
+             if (union_seen | tag_seen)
+               complain_at (dollar_loc, _("$%d of `%s' has no declared type"),
+                            n, effective_rule->content.sym->tag);
+             else
+               untyped_var_seen = true;
+             type_name = "";
+           }
+

          obstack_fgrow3 (&obstack_for_string,
                          "]b4_rhs_value(%d, %d, [%s])[",
                          effective_rule_length, n, type_name);
          obstack_fgrow3 (&obstack_for_string,
                          "]b4_rhs_value(%d, %d, [%s])[",
                          effective_rule_length, n, type_name);


@@ -324,23 +338,21 @@ static void
 handle_action_at (symbol_list *rule, char *text, location at_loc)
 {
   char *cp = text + 1;
 handle_action_at (symbol_list *rule, char *text, location at_loc)
 {
   char *cp = text + 1;

-  locations_flag = true;
-  int effective_rule_length;
+  int effective_rule_length =
+    (rule->midrule_parent_rule
+     ? rule->midrule_parent_rhs_index - 1
+     : symbol_list_length (rule->next));

 
 

-  if (rule->midrule_parent_rule)
-    effective_rule_length = rule->midrule_parent_rhs_index - 1;
-  else
-    effective_rule_length = symbol_list_length (rule->next);
+  locations_flag = true;

 
   if (*cp == '$')
     obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
   else
     {
 
   if (*cp == '$')
     obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
   else
     {

-      long int num;
-      set_errno (0);
-      num = strtol (cp, 0, 10);
+      long int num = strtol (cp, NULL, 10);

 
 

-      if (INT_MIN <= num && num <= effective_rule_length && ! get_errno ())
+      if (1 - INT_MAX + effective_rule_length <= num
+         && num <= effective_rule_length)

        {
          int n = num;
          obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
        {
          int n = num;
          obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",


@@ -356,20 +368,18 @@ handle_action_at (symbol_list *rule, char *text, location at_loc)
 | Initialize the scanner.  |
 `-------------------------*/
 
 | Initialize the scanner.  |
 `-------------------------*/
 

-/* Translate the dollars and ats in \a a, whose location is l.
-   Depending on the \a sc_context (SC_RULE_ACTION, SC_SYMBOL_ACTION,
-   INITIAL), the processing is different.  */
+/* Translate the dollars and ats in \a a, whose location is \a l.  The
+   translation is for \a rule, in the context \a sc_context
+   (SC_RULE_ACTION, SC_SYMBOL_ACTION, INITIAL).  */

 
 

-static const char *
-translate_action (int sc_context, symbol_list *rule, const char *a, location l)
+static char const *
+translate_action (int sc_context, symbol_list *rule, char const *a, location l)

 {
 {

-  const char *res;
+  char *res;

   static bool initialized = false;
   if (!initialized)
     {
       obstack_init (&obstack_for_string);
   static bool initialized = false;
   if (!initialized)
     {
       obstack_init (&obstack_for_string);

-      /* The initial buffer, never used. */
-      yy_delete_buffer (YY_CURRENT_BUFFER);

       yy_flex_debug = 0;
       initialized = true;
     }
       yy_flex_debug = 0;
       initialized = true;
     }


@@ -382,21 +392,21 @@ translate_action (int sc_context, symbol_list *rule, const char *a, location l)
   return res;
 }
 
   return res;
 }
 

-const char *
+char const *

 translate_rule_action (symbol_list *rule)
 {
   return translate_action (SC_RULE_ACTION, rule, rule->action,
                           rule->action_location);
 }
 
 translate_rule_action (symbol_list *rule)
 {
   return translate_action (SC_RULE_ACTION, rule, rule->action,
                           rule->action_location);
 }
 

-const char *
-translate_symbol_action (const char *a, location l)
+char const *
+translate_symbol_action (char const *a, location l)

 {
   return translate_action (SC_SYMBOL_ACTION, NULL, a, l);
 }
 
 {
   return translate_action (SC_SYMBOL_ACTION, NULL, a, l);
 }
 

-const char *
-translate_code (const char *a, location l)
+char const *
+translate_code (char const *a, location l)

 {
   return translate_action (INITIAL, NULL, a, l);
 }
 {
   return translate_action (INITIAL, NULL, a, l);
 }


@@ -410,5 +420,5 @@ code_scanner_free (void)
 {
   obstack_free (&obstack_for_string, 0);
   /* Reclaim Flex's buffers.  */
 {
   obstack_free (&obstack_for_string, 0);
   /* Reclaim Flex's buffers.  */

-  yy_delete_buffer (YY_CURRENT_BUFFER);
+  yylex_destroy ();

 }
 }