/* 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.
#define YY_USER_ACTION location_compute (loc, &loc->end, yytext, yyleng);
+static char *fetch_type_name (char *cp, char const **type_name,
+ location dollar_loc);
+
static void handle_action_dollar (symbol_list *rule, char *cp,
location dollar_loc);
static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
/* 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 direcive, but don't bother. */
- 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;
+<SC_RULE_ACTION,SC_SYMBOL_ACTION>
+{
+ "'" STRING_GROW; BEGIN SC_CHARACTER;
+ "\"" STRING_GROW; BEGIN SC_STRING;
+ "/"{splice}"*" STRING_GROW; BEGIN SC_COMMENT;
+ "/"{splice}"/" STRING_GROW; BEGIN SC_LINE_COMMENT;
+
+ [$@] {
+ complain (loc, Wother, _("stray '%s'"), yytext);
+ obstack_escape (&obstack_for_string, yytext);
}
}
<SC_RULE_ACTION>
{
"$"("<"{tag}">")?{ref} {
- ref_tail_fields = 0;
+ ref_tail_fields = NULL;
handle_action_dollar (self->rule, yytext, *loc);
- if (ref_tail_fields) {
+ if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- }
- need_semicolon = true;
}
"@"{ref} {
- ref_tail_fields = 0;
+ ref_tail_fields = NULL;
handle_action_at (self->rule, yytext, *loc);
- if (ref_tail_fields) {
+ if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- }
- need_semicolon = true;
- }
- "$" {
- complain_at (*loc, Wother, _("stray '$'"));
- obstack_sgrow (&obstack_for_string, "$][");
- need_semicolon = true;
- }
- "@" {
- complain_at (*loc, Wother, _("stray '@'"));
- obstack_sgrow (&obstack_for_string, "@@");
- need_semicolon = true;
- }
- "[" {
- obstack_sgrow (&obstack_for_string, "@{");
- need_semicolon = true;
}
- "]" {
- obstack_sgrow (&obstack_for_string, "@}");
- 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. */
- if (outer_brace && !yacc_flag && language_prio == default_prio
- && skeleton_prio == default_prio && need_semicolon && ! in_cpp)
- {
- complain_at (*loc, Wother,
- _("a ';' might be needed at the end of action code"));
- complain_at (*loc, Wother,
- _("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;
-
- /* YYFAIL is undocumented and was formally deprecated in Bison
- 2.4.2. */
- YYFAIL {
- STRING_GROW; need_semicolon = true;
- complain_at (*loc, Wother,
- _("use of YYFAIL, which is deprecated and will be removed"));
- }
-
- /* The sole purpose of this is to make sure identifiers that merely
- contain YYFAIL don't produce the above warning. */
- [A-Za-z_][0-9A-Za-z_]* STRING_GROW; need_semicolon = true;
-
- . STRING_GROW; need_semicolon = true;
}
<SC_SYMBOL_ACTION>
{
- "$$" {
- obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
+ "$"("<"{tag}">")?"$" {
+ const char *type_name = NULL;
+ fetch_type_name (yytext + 1, &type_name, *loc)[-1] = 0;
+ obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar(");
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
self->is_value_used = true;
}
"@$" {
}
- /*-----------------------------------------.
- | Escape M4 quoting characters in C code. |
- `-----------------------------------------*/
-
<*>
{
- \$ obstack_sgrow (&obstack_for_string, "$][");
- \@ obstack_sgrow (&obstack_for_string, "@@");
- \[ obstack_sgrow (&obstack_for_string, "@{");
- \] obstack_sgrow (&obstack_for_string, "@}");
-}
-
- /*-----------------------------------------------------.
- | By default, grow the string obstack with the input. |
- `-----------------------------------------------------*/
+ /* Escape M4 quoting characters in C code. */
+ [$@\[\]] obstack_escape (&obstack_for_string, yytext);
-<*>.|\n STRING_GROW;
+ /* By default, grow the string obstack with the input. */
+ .|\n STRING_GROW;
/* End of processing. */
-<*><<EOF>> {
- STRING_FINISH;
- return last_string;
- }
+ <<EOF>> STRING_FINISH; return last_string;
+}
%%
not visible from current midrule. */
#define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 2)
-static variant *variant_table = 0;
+static variant *variant_table = NULL;
static unsigned variant_table_size = 0;
static unsigned variant_count = 0;
variant_table_free (void)
{
free (variant_table);
- variant_table = 0;
+ variant_table = NULL;
variant_table_size = variant_count = 0;
}
}
static void
-show_sub_messages (const char* cp, bool explicit_bracketing,
- int midrule_rhs_index, char dollar_or_at,
- bool is_warning, unsigned indent)
+show_sub_message (warnings warning,
+ const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ unsigned indent, const variant *var)
{
- unsigned i;
+ const char *at_spec = get_at_spec (var->symbol_index);
- for (i = 0; i < variant_count; ++i)
+ if (var->err == 0)
+ complain_indent (&var->loc, warning, &indent,
+ _("refers to: %c%s at %s"), dollar_or_at,
+ var->id, at_spec);
+ else
{
- const variant *var = &variant_table[i];
- const char *at_spec = get_at_spec (var->symbol_index);
+ static struct obstack msg_buf;
+ const char *tail = explicit_bracketing ? "" : cp + strlen (var->id);
+ const char *id;
+ location id_loc;
- if (var->err == 0)
+ if (var->hidden_by)
{
- if (is_warning)
- complain_at_indent (var->loc, Wother, &indent,
- _("refers to: %c%s at %s"), dollar_or_at,
- var->id, at_spec);
- else
- complain_at_indent (var->loc, complaint, &indent,
- _("refers to: %c%s at %s"), dollar_or_at,
- var->id, at_spec);
+ id = var->hidden_by->id;
+ id_loc = var->hidden_by->loc;
}
else
{
- 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;
-
- /* Create the explanation message. */
- obstack_init (&msg_buf);
-
- obstack_fgrow1 (&msg_buf, _("possibly meant: %c"), dollar_or_at);
- if (contains_dot_or_dash (id))
- obstack_fgrow1 (&msg_buf, "[%s]", id);
- else
- obstack_sgrow (&msg_buf, id);
- obstack_sgrow (&msg_buf, tail);
-
- if (var->err & VARIANT_HIDDEN)
- {
- obstack_fgrow1 (&msg_buf, _(", hiding %c"), dollar_or_at);
- if (contains_dot_or_dash (var->id))
- obstack_fgrow1 (&msg_buf, "[%s]", var->id);
- else
- obstack_sgrow (&msg_buf, var->id);
- obstack_sgrow (&msg_buf, tail);
- }
+ id = var->id;
+ id_loc = var->loc;
+ }
- obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec);
+ /* Create the explanation message. */
+ obstack_init (&msg_buf);
- if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE)
- {
- const char *format =
- _(", cannot be accessed from mid-rule action at $%d");
- obstack_fgrow1 (&msg_buf, format, midrule_rhs_index);
- }
+ obstack_printf (&msg_buf, _("possibly meant: %c"), dollar_or_at);
+ if (contains_dot_or_dash (id))
+ obstack_printf (&msg_buf, "[%s]", id);
+ else
+ obstack_sgrow (&msg_buf, id);
+ obstack_sgrow (&msg_buf, tail);
- obstack_1grow (&msg_buf, '\0');
- if (is_warning)
- complain_at_indent (id_loc, Wother, &indent, "%s",
- (char *) obstack_finish (&msg_buf));
+ if (var->err & VARIANT_HIDDEN)
+ {
+ obstack_printf (&msg_buf, _(", hiding %c"), dollar_or_at);
+ if (contains_dot_or_dash (var->id))
+ obstack_printf (&msg_buf, "[%s]", var->id);
else
- complain_at_indent (id_loc, complaint, &indent, "%s",
- (char *) obstack_finish (&msg_buf));
- obstack_free (&msg_buf, 0);
+ obstack_sgrow (&msg_buf, var->id);
+ obstack_sgrow (&msg_buf, tail);
}
+
+ obstack_printf (&msg_buf, _(" at %s"), at_spec);
+
+ if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE)
+ obstack_printf (&msg_buf,
+ _(", cannot be accessed from mid-rule action at $%d"),
+ midrule_rhs_index);
+
+ complain_indent (&id_loc, warning, &indent, "%s",
+ obstack_finish0 (&msg_buf));
+ obstack_free (&msg_buf, 0);
}
}
+static void
+show_sub_messages (warnings warning,
+ const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ unsigned indent)
+{
+ unsigned i;
+
+ for (i = 0; i < variant_count; ++i)
+ show_sub_message (warning | silent,
+ cp, explicit_bracketing,
+ midrule_rhs_index, dollar_or_at,
+ indent, &variant_table[i]);
+}
+
/* Returned from "parse_ref" when the reference
is inappropriate. */
#define INVALID_REF (INT_MIN)
points to LHS ($$) of the current rule or midrule. */
#define LHS_REF (INT_MIN + 1)
-/* Sub-messages indent. */
-#define SUB_INDENT (4)
-
/* Parse named or positional reference. In case of positional
references, can return negative values for $-n "deep" stack
accesses. */
return num;
else
{
- complain_at (text_loc, complaint, _("integer out of range: %s"),
- quote (text));
+ complain (&text_loc, complaint, _("integer out of range: %s"),
+ quote (text));
return INVALID_REF;
}
}
cp_end - cp : ref_tail_fields - cp;
unsigned indent = 0;
- complain_at_indent (text_loc, complaint, &indent,
- _("invalid reference: %s"), quote (text));
+ complain_indent (&text_loc, complaint, &indent,
+ _("invalid reference: %s"), quote (text));
indent += SUB_INDENT;
if (len == 0)
{
location sym_loc = text_loc;
sym_loc.start.column += 1;
sym_loc.end = sym_loc.start;
- const char *format =
- _("syntax error after '%c', expecting integer, letter,"
- " '_', '[', or '$'");
- complain_at_indent (sym_loc, complaint, &indent, format,
- dollar_or_at);
+ complain_indent (&sym_loc, complaint, &indent,
+ _("syntax error after '%c', expecting integer, "
+ "letter, '_', '[', or '$'"),
+ dollar_or_at);
}
else if (midrule_rhs_index)
- {
- const char *format =
- _("symbol not found in production before $%d: %.*s");
- complain_at_indent (rule->location, complaint, &indent, format,
- midrule_rhs_index, len, cp);
- }
+ complain_indent (&rule->location, complaint, &indent,
+ _("symbol not found in production before $%d: "
+ "%.*s"),
+ midrule_rhs_index, len, cp);
else
- {
- const char *format =
- _("symbol not found in production: %.*s");
- complain_at_indent (rule->location, complaint, &indent, format,
- len, cp);
- }
+ complain_indent (&rule->location, complaint, &indent,
+ _("symbol not found in production: %.*s"),
+ len, cp);
if (variant_count > 0)
- show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
- dollar_or_at, false, indent);
+ show_sub_messages (complaint,
+ cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, indent);
return INVALID_REF;
}
case 1:
unsigned indent = 0;
if (variant_count > 1)
{
- complain_at_indent (text_loc, Wother, &indent,
- _("misleading reference: %s"), quote (text));
- show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
- dollar_or_at, true, indent + SUB_INDENT);
+ complain_indent (&text_loc, Wother, &indent,
+ _("misleading reference: %s"), quote (text));
+ show_sub_messages (Wother,
+ cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, indent + SUB_INDENT);
}
{
unsigned symbol_index =
default:
{
unsigned indent = 0;
- complain_at_indent (text_loc, complaint, &indent,
- _("ambiguous reference: %s"), quote (text));
- show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
- dollar_or_at, false, indent + SUB_INDENT);
+ complain_indent (&text_loc, complaint, &indent,
+ _("ambiguous reference: %s"), quote (text));
+ show_sub_messages (complaint,
+ cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, indent + SUB_INDENT);
return INVALID_REF;
}
}
-
- /* Not reachable. */
- return INVALID_REF;
}
/* Keeps track of the maximum number of semantic values to the left of
int max_left_semantic_context = 0;
+/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
+ beginning (i.e., after the opening "<", and return the pointer
+ immediately after it. */
+
+static
+char *
+fetch_type_name (char *cp, char const **type_name,
+ location dollar_loc)
+{
+ if (*cp == '<')
+ {
+ *type_name = ++cp;
+ /* Series of non-'>' or "->". */
+ while (*cp != '>' || cp[-1] == '-')
+ ++cp;
+
+ /* The '>' symbol will be later replaced by '\0'. Original
+ 'text' is needed for error messages. */
+ ++cp;
+ if (untyped_var_seen)
+ complain (&dollar_loc, complaint,
+ _("explicit type given in untyped grammar"));
+ tag_seen = true;
+ }
+ return cp;
+}
+
/*------------------------------------------------------------------.
| TEXT is pointing to a wannabee semantic value (i.e., a '$'). |
| |
{
char const *type_name = NULL;
char *cp = text + 1;
- char *gt_ptr = 0;
symbol_list *effective_rule;
int effective_rule_length;
int n;
}
/* Get the type name if explicit. */
- if (*cp == '<')
- {
- type_name = ++cp;
- while (*cp != '>')
- ++cp;
-
- /* The '>' symbol will be later replaced by '\0'. Original
- 'text' is needed for error messages. */
- gt_ptr = cp;
- ++cp;
- if (untyped_var_seen)
- complain_at (dollar_loc, complaint,
- _("explicit type given in untyped grammar"));
- tag_seen = true;
- }
+ cp = fetch_type_name (cp, &type_name, dollar_loc);
n = parse_ref (cp, effective_rule, effective_rule_length,
rule->midrule_parent_rhs_index, text, dollar_loc, '$');
- if (gt_ptr)
- *gt_ptr = '\0';
+ /* End type_name. */
+ if (type_name)
+ cp[-1] = '\0';
switch (n)
{
if (union_seen | tag_seen)
{
if (rule->midrule_parent_rule)
- complain_at (dollar_loc, complaint,
+ complain (&dollar_loc, complaint,
_("$$ for the midrule at $%d of %s"
" has no declared type"),
rule->midrule_parent_rhs_index,
quote (effective_rule->content.sym->tag));
else
- complain_at (dollar_loc, complaint,
- _("$$ of %s has no declared type"),
- quote (rule->content.sym->tag));
+ complain (&dollar_loc, complaint,
+ _("$$ of %s has no declared type"),
+ quote (rule->content.sym->tag));
}
else
untyped_var_seen = true;
- type_name = "";
}
- obstack_fgrow1 (&obstack_for_string,
- "]b4_lhs_value([%s])[", type_name);
+ obstack_sgrow (&obstack_for_string, "]b4_lhs_value(");
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
rule->action_props.is_value_used = true;
break;
if (!type_name)
{
if (union_seen | tag_seen)
- complain_at (dollar_loc, complaint,
- _("$%s of %s has no declared type"), cp,
- quote (effective_rule->content.sym->tag));
+ complain (&dollar_loc, complaint,
+ _("$%s of %s has no declared type"), cp,
+ quote (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);
- if (n > 0)
+ obstack_printf (&obstack_for_string,
+ "]b4_rhs_value(%d, %d, ", effective_rule_length, n);
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
+ if (0 < n)
symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
true;
break;
break;
default:
- obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
+ obstack_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
effective_rule_length, n);
break;
}
*self = code_props_none;
}
-code_props const code_props_none = CODE_PROPS_NONE_INIT;
+code_props code_props_none = CODE_PROPS_NONE_INIT;
void
code_props_plain_init (code_props *self, char const *code,
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