/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2006-2012 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);
/* C style identifier. Must start with letter. Will be used for
named symbol references. Shall be kept synchronized with
scan-gram.l "letter" and "id". */
-letter [-.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
-id {letter}({letter}|[0-9])*
+letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id {letter}({letter}|[-0-9])*
ref -?[0-9]+|{id}|"["{id}"]"|"$"
%%
int braces_level = 0;
/* Whether a semicolon is probably needed.
- The heuristic is that a semicolon is not needed after `{', `}', `;',
- or a C preprocessor directive, and that whitespaces and comments
- do not affect this flag.
- Note that `{' does not need a semicolon because of `{}'.
- A semicolon may be needed before a cpp direcive, but don't bother. */
+
+ The heuristic is that a semicolon is not needed after '{', '}',
+ ';', or a C preprocessor directive, and that whitespaces and
+ comments do not affect this flag. Note that '{' does not need a
+ semicolon because of '{}'. A semicolon may be needed before a
+ cpp directive, but don't bother.
+
+ While it is maintained in several start-conditions (factoring
+ opportunities), it is meaningful only for SC_RULE_ACTION. */
bool need_semicolon = false;
/* Whether in a C preprocessor directive. Don't use a start condition
%}
/*------------------------------------------------------------.
- | Scanning a C comment. The initial `/ *' is already eaten. |
+ | Scanning a C comment. The initial '/ *' is already eaten. |
`------------------------------------------------------------*/
<SC_COMMENT>
/*--------------------------------------------------------------.
- | Scanning a line comment. The initial `//' is already eaten. |
+ | Scanning a line comment. The initial '//' is already eaten. |
`--------------------------------------------------------------*/
<SC_LINE_COMMENT>
}
-<SC_RULE_ACTION,SC_SYMBOL_ACTION>{
+<SC_RULE_ACTION,SC_SYMBOL_ACTION>
+{
"'" {
STRING_GROW;
BEGIN SC_CHARACTER;
STRING_GROW;
BEGIN SC_LINE_COMMENT;
}
+ [$@] {
+ warn_at (*loc, _("stray '%s'"), yytext);
+ obstack_escape (&obstack_for_string, yytext);
+ need_semicolon = true;
+ }
+ [\[\]] {
+ obstack_escape (&obstack_for_string, yytext);
+ need_semicolon = true;
+ }
}
<SC_RULE_ACTION>
{
"$"("<"{tag}">")?{ref} {
- ref_tail_fields = 0;
+ ref_tail_fields = NULL;
handle_action_dollar (self->rule, yytext, *loc);
- if (ref_tail_fields) {
+ if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- }
need_semicolon = true;
}
"@"{ref} {
- ref_tail_fields = 0;
+ ref_tail_fields = NULL;
handle_action_at (self->rule, yytext, *loc);
- if (ref_tail_fields) {
+ if (ref_tail_fields)
obstack_sgrow (&obstack_for_string, ref_tail_fields);
- }
- need_semicolon = true;
- }
- "$" {
- warn_at (*loc, _("stray `$'"));
- obstack_sgrow (&obstack_for_string, "$][");
- need_semicolon = true;
- }
- "@" {
- warn_at (*loc, _("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;
}
"}" {
bool outer_brace = --braces_level == 0;
- /* As an undocumented Bison extension, append `;' before the last
+ /* 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
+ ';'. 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)
{
- warn_at (*loc, _("a `;' might be needed at the end of action code"));
- warn_at (*loc, _("future versions of Bison will not add the `;'"));
- obstack_1grow (&obstack_for_string, ';');
+ warn_at (*loc, _("a ';' might be needed at the end of action code"));
+ warn_at (*loc, _("future versions of Bison will not add the ';'"));
+ obstack_1grow (&obstack_for_string, ';');
}
STRING_GROW;
/* 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. */
+ '#' 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;
+ [\n\r] STRING_GROW; if (in_cpp) in_cpp = need_semicolon = false;
[ \t\f] STRING_GROW;
- . STRING_GROW; need_semicolon = true;
+
+ /* YYFAIL is undocumented and was formally deprecated in Bison
+ 2.4.2. */
+ YYFAIL {
+ STRING_GROW; need_semicolon = true;
+ warn_at (*loc, _("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, "@}");
-}
+ /* Escape M4 quoting characters in C code. */
+ [$@\[\]] obstack_escape (&obstack_for_string, yytext);
- /*-----------------------------------------------------.
- | By default, grow the string obstack with the input. |
- `-----------------------------------------------------*/
+ /* By default, grow the string obstack with the input. */
+ .|\n STRING_GROW;
-<*>.|\n STRING_GROW;
-
- /* End of processing. */
-<*><<EOF>> {
- STRING_FINISH;
- return last_string;
- }
+ /* End of processing. */
+ <<EOF>> STRING_FINISH; return last_string;
+}
%%
typedef struct
{
/* Index in symbol list. */
- unsigned index;
+ unsigned symbol_index;
/* Matched symbol id and loc. */
uniqstr id;
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 variant *
variant_add (uniqstr id, location id_loc, unsigned symbol_index,
- char *cp, char *cp_end, bool exact_mode)
+ char *cp, char *cp_end, bool explicit_bracketing)
{
char *prefix_end;
prefix_end = find_prefix_end (id, cp, cp_end);
if (prefix_end &&
(prefix_end == cp_end ||
- (!exact_mode && is_dot_or_dash (*prefix_end))))
+ (!explicit_bracketing && is_dot_or_dash (*prefix_end))))
{
variant *r = variant_table_grow ();
- r->index = symbol_index;
+ r->symbol_index = symbol_index;
r->id = id;
r->loc = id_loc;
r->hidden_by = NULL;
}
static const char *
-get_at_spec(unsigned symbol_index)
+get_at_spec (unsigned symbol_index)
{
static char at_buf[20];
if (symbol_index == 0)
return at_buf;
}
+static void
+show_sub_messages (const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ bool is_warning, unsigned indent)
+{
+ unsigned i;
+
+ for (i = 0; i < variant_count; ++i)
+ {
+ const variant *var = &variant_table[i];
+ const char *at_spec = get_at_spec (var->symbol_index);
+
+ if (var->err == 0)
+ {
+ if (is_warning)
+ warn_at_indent (var->loc, &indent, _("refers to: %c%s at %s"),
+ dollar_or_at, var->id, at_spec);
+ else
+ complain_at_indent (var->loc, &indent, _("refers to: %c%s at %s"),
+ dollar_or_at, var->id, at_spec);
+ }
+ 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_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);
+
+ 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
+ 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)
+ {
+ const char *format =
+ _(", cannot be accessed from mid-rule action at $%d");
+ obstack_printf (&msg_buf, format, midrule_rhs_index);
+ }
+
+ obstack_1grow (&msg_buf, '\0');
+ if (is_warning)
+ warn_at_indent (id_loc, &indent, "%s",
+ (char *) obstack_finish (&msg_buf));
+ else
+ complain_at_indent (id_loc, &indent, "%s",
+ (char *) obstack_finish (&msg_buf));
+ obstack_free (&msg_buf, 0);
+ }
+ }
+}
+
/* Returned from "parse_ref" when the reference
is inappropriate. */
#define INVALID_REF (INT_MIN)
/* Returned from "parse_ref" when the reference
- points to LHS ($$) of the current rule. */
+ points to LHS ($$) 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 $-n "deep" stack
accesses. */
{
symbol_list *l;
char *cp_end;
- bool exact_mode;
- bool has_error;
- bool has_valid;
+ bool explicit_bracketing;
unsigned i;
+ unsigned valid_variants = 0;
+ unsigned valid_variant_index = 0;
if ('$' == *cp)
return LHS_REF;
continue;
cp_end = p;
- exact_mode = true;
+ explicit_bracketing = true;
}
else
{
continue;
cp_end = p;
- exact_mode = false;
+ explicit_bracketing = false;
}
/* Add all relevant variants. */
continue;
var = variant_add (l->content.sym->tag, l->sym_loc,
- symbol_index, cp, cp_end, exact_mode);
+ symbol_index, cp, cp_end, explicit_bracketing);
if (var && l->named_ref)
var->hidden_by = l->named_ref;
if (l->named_ref)
variant_add (l->named_ref->id, l->named_ref->loc,
- symbol_index, cp, cp_end, exact_mode);
+ symbol_index, cp, cp_end, explicit_bracketing);
}
}
/* Check errors. */
- has_error = false;
- has_valid = false;
for (i = 0; i < variant_count; ++i)
{
variant *var = &variant_table[i];
- unsigned symbol_index = var->index;
+ unsigned symbol_index = var->symbol_index;
/* Check visibility from mid-rule actions. */
if (midrule_rhs_index != 0
&& (symbol_index == 0 || midrule_rhs_index < symbol_index))
- {
- var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
- has_error = true;
- }
+ var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
/* Check correct bracketing. */
- if (!exact_mode && contains_dot_or_dash (var->id))
- {
- var->err |= VARIANT_BAD_BRACKETING;
- has_error = true;
- }
+ if (!explicit_bracketing && contains_dot_or_dash (var->id))
+ var->err |= VARIANT_BAD_BRACKETING;
/* Check using of hidden symbols. */
if (var->hidden_by)
- {
- var->err |= VARIANT_HIDDEN;
- has_error = true;
- }
+ var->err |= VARIANT_HIDDEN;
if (!var->err)
- has_valid = true;
+ {
+ valid_variant_index = i;
+ ++valid_variants;
+ }
}
- if (variant_count == 1 && has_valid)
+ switch (valid_variants)
{
- /* The only "good" case is here. */
- unsigned symbol_index = variant_table[0].index;
- if (symbol_index == midrule_rhs_index)
- return LHS_REF;
- else
- return symbol_index;
- }
-
- /* Start complaining. */
-
- if (variant_count == 0)
- complain_at (text_loc, _("invalid reference: %s, symbol not found"),
- quote (text));
- else if (variant_count > 1 && !has_error)
- complain_at (text_loc, _("ambiguous reference: %s"),
- quote (text));
- else if (variant_count > 1 && has_valid && has_error)
- complain_at (text_loc, _("misleading reference: %s"),
- quote (text));
- else
- complain_at (text_loc, _("invalid reference: %s"),
- quote (text));
-
- for (i = 0; i < variant_count; ++i)
- {
- const variant *var = &variant_table[i];
- const char *at_spec = get_at_spec (var->index);
-
- if (var->err == 0)
- complain_at (var->loc, _(" refers to: %c%s at %s"),
- dollar_or_at, var->id, at_spec);
- else
- {
- static struct obstack msg_buf;
- const char *tail = exact_mode ? "" :
- 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);
- }
-
- obstack_fgrow1 (&msg_buf, " at %s", at_spec);
-
- if (var->err & VARIANT_NOT_VISIBLE_FROM_MIDRULE)
- obstack_fgrow1 (&msg_buf, ", cannot be accessed from "
- "mid-rule action at $%d", midrule_rhs_index);
-
- obstack_1grow (&msg_buf, '\0');
- complain_at (id_loc, _("%s"), (char *) obstack_finish (&msg_buf));
- obstack_free (&msg_buf, 0);
- }
+ case 0:
+ {
+ unsigned len = (explicit_bracketing || !ref_tail_fields) ?
+ cp_end - cp : ref_tail_fields - cp;
+ unsigned indent = 0;
+
+ complain_at_indent (text_loc, &indent, _("invalid reference: %s"),
+ quote (text));
+ indent += SUB_INDENT;
+ if (len == 0)
+ {
+ location sym_loc = text_loc;
+ sym_loc.start.column += 1;
+ sym_loc.end = sym_loc.start;
+ const char *format =
+ _("syntax error after '%c', expecting integer, letter,"
+ " '_', '[', or '$'");
+ complain_at_indent (sym_loc, &indent, format, dollar_or_at);
+ }
+ else if (midrule_rhs_index)
+ {
+ const char *format =
+ _("symbol not found in production before $%d: %.*s");
+ complain_at_indent (rule->location, &indent, format,
+ midrule_rhs_index, len, cp);
+ }
+ else
+ {
+ const char *format =
+ _("symbol not found in production: %.*s");
+ complain_at_indent (rule->location, &indent, format,
+ len, cp);
+ }
+
+ if (variant_count > 0)
+ show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, false, indent);
+ return INVALID_REF;
+ }
+ case 1:
+ {
+ unsigned indent = 0;
+ if (variant_count > 1)
+ {
+ warn_at_indent (text_loc, &indent, _("misleading reference: %s"),
+ quote (text));
+ show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, true, indent + SUB_INDENT);
+ }
+ {
+ unsigned symbol_index =
+ variant_table[valid_variant_index].symbol_index;
+ return (symbol_index == midrule_rhs_index) ? LHS_REF : symbol_index;
+ }
+ }
+ case 2:
+ default:
+ {
+ unsigned indent = 0;
+ complain_at_indent (text_loc, &indent, _("ambiguous reference: %s"),
+ quote (text));
+ show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, false, indent + SUB_INDENT);
+ return INVALID_REF;
+ }
}
+ /* Not reachable. */
return INVALID_REF;
}
int max_left_semantic_context = 0;
+/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
+ beginning (i.e., after the opening "<", and return the pointer
+ immediately after it. */
+
+static
+char *
+fetch_type_name (char *cp, char const **type_name,
+ location dollar_loc)
+{
+ if (*cp == '<')
+ {
+ *type_name = ++cp;
+ while (*cp != '>')
+ ++cp;
+
+ /* The '>' symbol will be later replaced by '\0'. Original
+ 'text' is needed for error messages. */
+ ++cp;
+ if (untyped_var_seen)
+ complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+ tag_seen = true;
+ }
+ return cp;
+}
+
/*------------------------------------------------------------------.
-| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
+| TEXT is pointing to a wannabee semantic value (i.e., a '$'). |
| |
| Possible inputs: $[<TYPENAME>]($|integer) |
| |
{
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, _("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)
{
type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
if (!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);
+ {
+ if (union_seen | tag_seen)
+ {
+ if (rule->midrule_parent_rule)
+ complain_at (dollar_loc,
+ _("$$ for the midrule at $%d of %s"
+ " has no declared type"),
+ rule->midrule_parent_rhs_index,
+ quote (effective_rule->content.sym->tag));
+ else
+ complain_at (dollar_loc, _("$$ of %s has no declared type"),
+ quote (rule->content.sym->tag));
+ }
+ else
+ untyped_var_seen = true;
+ }
+
+ 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;
type_name =
symbol_list_n_type_name_get (effective_rule, dollar_loc, n);
if (!type_name)
- {
- if (union_seen | tag_seen)
- complain_at (dollar_loc, _("$%s of `%s' has no declared type"),
- cp, effective_rule->content.sym->tag);
- else
- untyped_var_seen = true;
- type_name = "";
- }
-
- obstack_fgrow3 (&obstack_for_string,
- "]b4_rhs_value(%d, %d, [%s])[",
- effective_rule_length, n, type_name);
+ {
+ if (union_seen | tag_seen)
+ complain_at (dollar_loc, _("$%s of %s has no declared type"),
+ cp, quote (effective_rule->content.sym->tag));
+ else
+ untyped_var_seen = true;
+ }
+
+ 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 (n > 0)
symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
true;
/*------------------------------------------------------.
-| TEXT is a location token (i.e., a `@...'). Output to |
+| TEXT is a location token (i.e., a '@...'). Output to |
| OBSTACK_FOR_STRING a reference to this location. |
`------------------------------------------------------*/
locations_flag = true;
n = parse_ref (cp, effective_rule, effective_rule_length,
- rule->midrule_parent_rhs_index, text, at_loc, '@');
+ rule->midrule_parent_rhs_index, text, at_loc, '@');
switch (n)
{
case INVALID_REF:
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;
}
projects / bison.git / blobdiff