/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006-2013 Free Software Foundation, Inc.
+ Copyright (C) 2006-2015 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#define code_wrap() 1
#define FLEX_PREFIX(Id) code_ ## Id
-#include "flex-scanner.h"
+#include <src/flex-scanner.h>
-#include "complain.h"
-#include "reader.h"
-#include "getargs.h"
-#include "scan-code.h"
-#include "symlist.h"
+#include <src/complain.h>
+#include <src/reader.h>
+#include <src/getargs.h>
+#include <src/muscle-tab.h>
+#include <src/scan-code.h>
+#include <src/symlist.h>
#include <c-ctype.h>
#include <get-errno.h>
location dollar_loc);
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>]+
+ 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. */
-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}"]"|"$"
%%
%{
- /* 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. */
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;
%}
<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;
}
<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;
+
[$@] {
- warn_at (*loc, _("stray '%s'"), yytext);
- obstack_escape (&obstack_for_string, yytext);
- need_semicolon = true;
- }
- [\[\]] {
+ complain (loc, Wother, _("stray '%s'"), yytext);
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;
- warn_at_indent (*loc, &indent,
- _("a ';' might be needed at the end of action code"));
- indent += SUB_INDENT;
- warn_at_indent (*loc, &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;
-
- /* 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_at_dollar[");
- locations_flag = true;
+ muscle_percent_define_ensure("locations", the_location, true);
}
}
/* By default, grow the string obstack with the input. */
.|\n STRING_GROW;
- /* End of processing. */
+ /* End of processing. */
<<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 explicit_bracketing)
+ char *cp, char *cp_end, bool explicit_bracketing)
{
char *prefix_end;
}
static const char *
-get_at_spec (unsigned symbol_index)
+get_at_spec(unsigned symbol_index)
{
static char at_buf[20];
if (symbol_index == 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)
- 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);
+ 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_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);
- }
+ {
+ id = var->id;
+ id_loc = var->loc;
+ }
+
+ /* Create the explanation message. */
+ obstack_init (&msg_buf);
- obstack_1grow (&msg_buf, '\0');
- if (is_warning)
- warn_at_indent (id_loc, &indent, "%s",
- (char *) obstack_finish (&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
- complain_at_indent (id_loc, &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)
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;
{
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"),
- quote (text));
- return INVALID_REF;
- }
+ {
+ complain (&text_loc, complaint, _("integer out of range: %s"),
+ quote (text));
+ return INVALID_REF;
+ }
}
if ('[' == *cp)
/* Ignore the brackets. */
char *p;
for (p = ++cp; *p != ']'; ++p)
- continue;
+ continue;
cp_end = p;
explicit_bracketing = true;
/* 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;
explicit_bracketing = false;
for (symbol_index = 0, l = rule; !symbol_list_null (l);
++symbol_index, l = l->next)
{
- variant *var;
- if (l->content_type != SYMLIST_SYMBOL)
- continue;
+ variant *var;
+ if (l->content_type != SYMLIST_SYMBOL)
+ continue;
- var = variant_add (l->content.sym->tag, l->sym_loc,
+ 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 (var && l->named_ref)
+ var->hidden_by = l->named_ref;
- if (l->named_ref)
- variant_add (l->named_ref->id, l->named_ref->loc,
+ 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. */
cp_end - cp : ref_tail_fields - cp;
unsigned indent = 0;
- complain_at_indent (text_loc, &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, &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, &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, &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)
{
- 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);
+ 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, &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
if (*cp == '<')
{
*type_name = ++cp;
- while (*cp != '>')
- ++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. */
+ 'text' is needed for error messages. */
++cp;
if (untyped_var_seen)
- complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+ complain (&dollar_loc, complaint,
+ _("explicit type given in untyped grammar"));
tag_seen = true;
}
return cp;
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, '$');
+ rule->midrule_parent_rhs_index, text, dollar_loc, '$');
/* End type_name. */
if (type_name)
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,
+ complain (&dollar_loc, complaint,
_("$$ for the midrule at $%d of %s"
" has no declared type"),
rule->midrule_parent_rhs_index,
quote (effective_rule->content.sym->tag));
else
- complain_at (dollar_loc, _("$$ 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;
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, _("$%s of %s has no declared type"),
- cp, quote (effective_rule->content.sym->tag));
+ complain (&dollar_loc, complaint,
+ _("$%s of %s has no declared type"), cp,
+ quote (effective_rule->content.sym->tag));
else
untyped_var_seen = true;
}
obstack_printf (&obstack_for_string,
- "]b4_rhs_value(%d, %d, ", effective_rule_length, n);
+ "]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;
+ if (0 < n)
+ symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
+ true;
break;
}
}
effective_rule_length = symbol_list_length (rule->next);
}
- locations_flag = true;
+ 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_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
- effective_rule_length, n);
+ 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,
- location code_loc)
+ location code_loc)
{
+ code_props_none_init (self);
self->kind = CODE_PROPS_PLAIN;
self->code = code;
self->location = code_loc;
- self->is_value_used = false;
- self->rule = NULL;
- self->named_ref = NULL;
}
void
code_props_symbol_action_init (code_props *self, char const *code,
location code_loc)
{
+ code_props_none_init (self);
self->kind = CODE_PROPS_SYMBOL_ACTION;
self->code = code;
self->location = code_loc;
- self->is_value_used = false;
- self->rule = NULL;
- self->named_ref = NULL;
}
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)
{
+ code_props_none_init (self);
self->kind = CODE_PROPS_RULE_ACTION;
self->code = code;
self->location = code_loc;
- self->is_value_used = false;
self->rule = rule;
self->named_ref = name;
+ self->is_predicate = is_predicate;
}
void
projects / bison.git / blobdiff