/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006-2012 Free Software Foundation, Inc.
+ Copyright (C) 2006-2015 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
/* POSIX says that a tag must be both an id and a C union member, but
historically almost any character is allowed in a tag. We disallow
- NUL and newline, as this simplifies our implementation. */
-tag [^\0\n>]+
+ NUL and newline, as this simplifies our implementation. We allow
+ "->" as a means to dereference a pointer. */
+tag ([^\0\n>]|->)+
/* Zero or more instances of backslash-newline. Following GCC, allow
white space between the backslash and the newline. */
%%
%{
- /* Nesting level of the current code in braces. */
- int braces_level = 0;
-
- /* Whether a semicolon is probably needed.
-
- The heuristic is that a semicolon is not needed after '{', '}',
- ';', or a C preprocessor directive, and that whitespaces and
- comments do not affect this flag. Note that '{' does not need a
- semicolon because of '{}'. A semicolon may be needed before a
- cpp directive, but don't bother.
-
- While it is maintained in several start-conditions (factoring
- opportunities), it is meaningful only for SC_RULE_ACTION. */
- bool need_semicolon = false;
-
- /* Whether in a C preprocessor directive. Don't use a start condition
- for this because, at the end of strings and comments, we still need
- to know whether we're in a directive. */
- bool in_cpp = false;
-
/* 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. */
<SC_RULE_ACTION,SC_SYMBOL_ACTION>
{
- "'" {
- STRING_GROW;
- BEGIN SC_CHARACTER;
- need_semicolon = true;
- }
- "\"" {
- STRING_GROW;
- BEGIN SC_STRING;
- need_semicolon = true;
- }
- "/"{splice}"*" {
- STRING_GROW;
- BEGIN SC_COMMENT;
- }
- "/"{splice}"/" {
- STRING_GROW;
- BEGIN SC_LINE_COMMENT;
- }
+ "'" STRING_GROW; BEGIN SC_CHARACTER;
+ "\"" STRING_GROW; BEGIN SC_STRING;
+ "/"{splice}"*" STRING_GROW; BEGIN SC_COMMENT;
+ "/"{splice}"/" STRING_GROW; BEGIN SC_LINE_COMMENT;
+
[$@] {
complain (loc, Wother, _("stray '%s'"), yytext);
obstack_escape (&obstack_for_string, yytext);
- need_semicolon = true;
- }
- [\[\]] {
- obstack_escape (&obstack_for_string, yytext);
- need_semicolon = true;
}
}
handle_action_dollar (self->rule, yytext, *loc);
if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- need_semicolon = true;
}
"@"{ref} {
ref_tail_fields = NULL;
handle_action_at (self->rule, yytext, *loc);
if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- need_semicolon = true;
- }
-
- ";" STRING_GROW; need_semicolon = false;
- "{" STRING_GROW; ++braces_level; need_semicolon = false;
- "}" {
- bool outer_brace = --braces_level == 0;
-
- /* As an undocumented Bison extension, append ';' before the last
- brace in braced code, so that the user code can omit trailing
- ';'. But do not append ';' if emulating Yacc, since Yacc does
- not append one. This is deprecated since release 2.4.1. */
- if (outer_brace && !yacc_flag && language_prio == default_prio
- && skeleton_prio == default_prio && need_semicolon && ! in_cpp)
- {
- unsigned int indent = 0;
- complain_indent (loc, Wdeprecated, &indent,
- _("a ';' might be needed at the end of action code"));
- indent += SUB_INDENT;
- complain_indent (loc, Wdeprecated | silent, &indent,
- _("future versions of Bison will not add the ';'"));
- obstack_1grow (&obstack_for_string, ';');
- }
-
- STRING_GROW;
- need_semicolon = false;
}
-
- /* Preprocessing directives should only be recognized at the beginning
- of lines, allowing whitespace including comments, but in C/C++,
- '#' can only be the start of preprocessor directives or within
- '#define' directives anyway, so don't bother with begin of line. */
- "#" STRING_GROW; in_cpp = true;
-
- {splice} STRING_GROW;
- [\n\r] STRING_GROW; if (in_cpp) in_cpp = need_semicolon = false;
- [ \t\f] STRING_GROW;
- . STRING_GROW; need_semicolon = true;
}
<SC_SYMBOL_ACTION>
{
static struct obstack msg_buf;
const char *tail = explicit_bracketing ? "" : cp + strlen (var->id);
- const char *id = var->hidden_by ? var->hidden_by->id : var->id;
- location id_loc = var->hidden_by ? var->hidden_by->loc : var->loc;
+ const char *id;
+ location id_loc;
+
+ if (var->hidden_by)
+ {
+ id = var->hidden_by->id;
+ id_loc = var->hidden_by->loc;
+ }
+ else
+ {
+ id = var->id;
+ id_loc = var->loc;
+ }
/* Create the explanation message. */
obstack_init (&msg_buf);
return INVALID_REF;
}
}
-
- /* Not reachable. */
- return INVALID_REF;
}
/* Keeps track of the maximum number of semantic values to the left of
if (*cp == '<')
{
*type_name = ++cp;
- while (*cp != '>')
+ /* Series of non-'>' or "->". */
+ while (*cp != '>' || cp[-1] == '-')
++cp;
/* The '>' symbol will be later replaced by '\0'. Original
"]b4_rhs_value(%d, %d, ", effective_rule_length, n);
obstack_quote (&obstack_for_string, type_name);
obstack_sgrow (&obstack_for_string, ")[");
- if (n > 0)
+ if (0 < n)
symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
true;
break;
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