/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006, 2007, 2008, 2009 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 void handle_action_dollar (symbol_list *rule, char *cp,
- location dollar_loc);
+ location dollar_loc);
static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
/* A string to be pushed to obstack after dollar/at has been handled. */
/* 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>]+
+tag [^\0\n>]+
/* Zero or more instances of backslash-newline. Following GCC, allow
white space between the backslash and the newline. */
-splice (\\[ \f\t\v]*\n)*
+splice (\\[ \f\t\v]*\n)*
/* 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}"]"|"$"
%%
int braces_level = 0;
/* Whether a semicolon is probably needed.
- The heuristic is that a semicolon is not needed after `{', `}', `;',
+ The heuristic is that a semicolon is not needed after '{', '}', ';',
or a C preprocessor directive, and that whitespaces and comments
do not affect this flag.
- Note that `{' does not need a semicolon because of `{}'.
+ Note that '{' does not need a semicolon because of '{}'.
A semicolon may be needed before a cpp direcive, but don't bother. */
bool need_semicolon = false;
is expected to return only once. This initialization is
therefore done once per action to translate. */
aver (sc_context == SC_SYMBOL_ACTION
- || sc_context == SC_RULE_ACTION
- || sc_context == INITIAL);
+ || sc_context == SC_RULE_ACTION
+ || sc_context == INITIAL);
BEGIN sc_context;
%}
/*------------------------------------------------------------.
- | Scanning a C comment. The initial `/ *' is already eaten. |
+ | Scanning a C comment. The initial '/ *' is already eaten. |
`------------------------------------------------------------*/
<SC_COMMENT>
/*--------------------------------------------------------------.
- | Scanning a line comment. The initial `//' is already eaten. |
+ | Scanning a line comment. The initial '//' is already eaten. |
`--------------------------------------------------------------*/
<SC_LINE_COMMENT>
{
- "\n" STRING_GROW; BEGIN sc_context;
- {splice} STRING_GROW;
+ "\n" STRING_GROW; BEGIN sc_context;
+ {splice} STRING_GROW;
}
<SC_CHARACTER,SC_STRING>
{
- {splice}|\\{splice}. STRING_GROW;
+ {splice}|\\{splice}. STRING_GROW;
}
<SC_CHARACTER>
{
- "'" STRING_GROW; BEGIN sc_context;
+ "'" STRING_GROW; BEGIN sc_context;
}
<SC_STRING>
{
- "\"" STRING_GROW; BEGIN sc_context;
+ "\"" STRING_GROW; BEGIN sc_context;
}
need_semicolon = true;
}
"$" {
- warn_at (*loc, _("stray `$'"));
+ warn_at (*loc, _("stray '$'"));
obstack_sgrow (&obstack_for_string, "$][");
need_semicolon = true;
}
"@" {
- warn_at (*loc, _("stray `@'"));
+ warn_at (*loc, _("stray '@'"));
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;
[ \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, "$][");
- \@ obstack_sgrow (&obstack_for_string, "@@");
- \[ obstack_sgrow (&obstack_for_string, "@{");
- \] obstack_sgrow (&obstack_for_string, "@}");
+ \$ 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. |
`-----------------------------------------------------*/
-<*>.|\n STRING_GROW;
+<*>.|\n STRING_GROW;
/* End of processing. */
-<*><<EOF>> {
+<*><<EOF>> {
STRING_FINISH;
return last_string;
}
if (variant_count > variant_table_size)
{
while (variant_count > variant_table_size)
- variant_table_size = 2 * variant_table_size + 3;
+ variant_table_size = 2 * variant_table_size + 3;
variant_table = xnrealloc (variant_table, variant_table_size,
- sizeof *variant_table);
+ sizeof *variant_table);
}
return &variant_table[variant_count - 1];
}
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->symbol_index = symbol_index;
}
static void
-show_sub_messages (const char* cp, bool exact_mode, int midrule_rhs_index,
- char dollar_or_at, bool is_warning)
+show_sub_messages (const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ bool is_warning, unsigned indent)
{
unsigned i;
if (var->err == 0)
{
if (is_warning)
- warn_at (var->loc, _(" refers to: %c%s at %s"),
- dollar_or_at, var->id, at_spec);
+ warn_at_indent (var->loc, &indent, _("refers to: %c%s at %s"),
+ dollar_or_at, var->id, at_spec);
else
- complain_at (var->loc, _(" refers to: %c%s at %s"),
- dollar_or_at, var->id, at_spec);
+ 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 = 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');
+ {
+ 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);
+ }
+
+ obstack_fgrow1 (&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_fgrow1 (&msg_buf, format, midrule_rhs_index);
+ }
+
+ obstack_1grow (&msg_buf, '\0');
if (is_warning)
- warn_at (id_loc, _("%s"), (char *) obstack_finish (&msg_buf));
+ warn_at_indent (id_loc, &indent, "%s",
+ (char *) obstack_finish (&msg_buf));
else
- complain_at (id_loc, _("%s"), (char *) obstack_finish (&msg_buf));
- obstack_free (&msg_buf, 0);
- }
+ complain_at_indent (id_loc, &indent, "%s",
+ (char *) obstack_finish (&msg_buf));
+ obstack_free (&msg_buf, 0);
+ }
}
}
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. */
static long int
parse_ref (char *cp, symbol_list *rule, int rule_length,
- int midrule_rhs_index, char *text, location text_loc,
- char dollar_or_at)
+ int midrule_rhs_index, char *text, location text_loc,
+ char dollar_or_at)
{
symbol_list *l;
char *cp_end;
- bool exact_mode;
+ bool explicit_bracketing;
unsigned i;
unsigned valid_variants = 0;
unsigned valid_variant_index = 0;
{
long int num = strtol (cp, &cp, 10);
if (1 - INT_MAX + rule_length <= num && num <= rule_length)
- return num;
+ return num;
else
- {
- complain_at (text_loc, _("integer out of range: %s"),
+ {
+ complain_at (text_loc, _("integer out of range: %s"),
quote (text));
- return INVALID_REF;
- }
+ return INVALID_REF;
+ }
}
if ('[' == *cp)
/* Ignore the brackets. */
char *p;
for (p = ++cp; *p != ']'; ++p)
- continue;
+ continue;
cp_end = p;
- exact_mode = true;
+ explicit_bracketing = true;
}
else
{
/* Take all characters of the name. */
char* p;
for (p = cp; *p; ++p)
- if (is_dot_or_dash (*p))
- {
- ref_tail_fields = p;
- break;
- }
+ if (is_dot_or_dash (*p))
+ {
+ ref_tail_fields = p;
+ break;
+ }
for (p = cp; *p; ++p)
- continue;
+ continue;
cp_end = p;
- exact_mode = false;
+ explicit_bracketing = false;
}
/* Add all relevant variants. */
for (symbol_index = 0, l = rule; !symbol_list_null (l);
++symbol_index, l = l->next)
{
- variant *var;
- if (l->content_type != SYMLIST_SYMBOL)
- continue;
-
- var = variant_add (l->content.sym->tag, l->sym_loc,
- symbol_index, cp, cp_end, exact_mode);
- 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);
+ variant *var;
+ if (l->content_type != SYMLIST_SYMBOL)
+ continue;
+
+ var = variant_add (l->content.sym->tag, l->sym_loc,
+ 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, explicit_bracketing);
}
}
/* Check visibility from mid-rule actions. */
if (midrule_rhs_index != 0
- && (symbol_index == 0 || midrule_rhs_index < symbol_index))
+ && (symbol_index == 0 || midrule_rhs_index < symbol_index))
var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
/* Check correct bracketing. */
- if (!exact_mode && contains_dot_or_dash (var->id))
+ if (!explicit_bracketing && contains_dot_or_dash (var->id))
var->err |= VARIANT_BAD_BRACKETING;
/* Check using of hidden symbols. */
switch (valid_variants)
{
case 0:
- if (variant_count == 0)
- complain_at (text_loc, _("invalid reference: %s, symbol not found"),
- quote (text));
- else
- {
- complain_at (text_loc, _("invalid reference: %s"),
- quote (text));
- show_sub_messages (cp, exact_mode, midrule_rhs_index,
- dollar_or_at, false);
- }
- return INVALID_REF;
+ {
+ 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 (text_loc, _("misleading reference: %s"),
- quote (text));
- show_sub_messages (cp, exact_mode, midrule_rhs_index,
- dollar_or_at, true);
+ 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 =
}
case 2:
default:
- complain_at (text_loc, _("ambiguous reference: %s"),
- quote (text));
- show_sub_messages (cp, exact_mode, midrule_rhs_index,
- dollar_or_at, false);
- return INVALID_REF;
+ {
+ 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. */
/*------------------------------------------------------------------.
-| 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) |
| |
{
type_name = ++cp;
while (*cp != '>')
- ++cp;
+ ++cp;
/* The '>' symbol will be later replaced by '\0'. Original
- 'text' is needed for error messages. */
+ 'text' is needed for error messages. */
gt_ptr = cp;
++cp;
if (untyped_var_seen)
- complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+ complain_at (dollar_loc, _("explicit type given in untyped grammar"));
tag_seen = true;
}
n = parse_ref (cp, effective_rule, effective_rule_length,
- rule->midrule_parent_rhs_index, text, dollar_loc, '$');
+ rule->midrule_parent_rhs_index, text, dollar_loc, '$');
if (gt_ptr)
*gt_ptr = '\0';
case LHS_REF:
if (!type_name)
- type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
+ 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, _("$$ of `%s' has no declared type"),
- rule->content.sym->tag);
- }
- else
- untyped_var_seen = true;
- type_name = "";
- }
+ {
+ if (union_seen | tag_seen)
+ {
+ if (rule->midrule_parent_rule)
+ complain_at (dollar_loc,
+ _("$$ 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;
+ type_name = "";
+ }
obstack_fgrow1 (&obstack_for_string,
- "]b4_lhs_value([%s])[", type_name);
+ "]b4_lhs_value([%s])[", type_name);
rule->action_props.is_value_used = true;
break;
default:
if (max_left_semantic_context < 1 - n)
- 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)
- {
- if (union_seen | tag_seen)
- complain_at (dollar_loc, _("$%s of `%s' has no declared type"),
- cp, effective_rule->content.sym->tag);
- else
- untyped_var_seen = true;
- type_name = "";
- }
+ {
+ if (union_seen | tag_seen)
+ complain_at (dollar_loc, _("$%s of %s has no declared type"),
+ cp, quote (effective_rule->content.sym->tag));
+ else
+ untyped_var_seen = true;
+ type_name = "";
+ }
obstack_fgrow3 (&obstack_for_string,
- "]b4_rhs_value(%d, %d, [%s])[",
- effective_rule_length, n, type_name);
+ "]b4_rhs_value(%d, %d, [%s])[",
+ effective_rule_length, n, type_name);
if (n > 0)
- symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
- true;
+ symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
+ true;
break;
}
}
/*------------------------------------------------------.
-| 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. |
`------------------------------------------------------*/
muscle_percent_define_ensure("locations", at_loc, 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:
default:
obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
- effective_rule_length, n);
+ effective_rule_length, n);
break;
}
}
void
code_props_plain_init (code_props *self, char const *code,
- location code_loc)
+ location code_loc)
{
self->kind = CODE_PROPS_PLAIN;
self->code = code;
void
code_props_rule_action_init (code_props *self, char const *code,
location code_loc, symbol_list *rule,
- named_ref *name)
+ named_ref *name, bool is_predicate)
{
self->kind = CODE_PROPS_RULE_ACTION;
self->code = code;
self->is_value_used = false;
self->rule = rule;
self->named_ref = name;
+ self->is_predicate = is_predicate;
}
void
projects / bison.git / blobdiff