X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4210cd0bfcf94b41ce12725f19a314db5ad3ae65..53e2cd1ebd0a99048610004ccb7ba11d351981bc:/src/scan-code.l?ds=inline
diff --git a/src/scan-code.l b/src/scan-code.l
index 4e464a7a..fa593beb 100644
--- a/src/scan-code.l
+++ b/src/scan-code.l
@@ -1,12 +1,12 @@
/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006 Free Software Foundation, Inc.
+ Copyright (C) 2006-2012 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -15,46 +15,56 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301 USA
-*/
+ along with this program. If not, see . */
-%option debug nodefault nounput noyywrap never-interactive
+%option debug nodefault noinput nounput noyywrap never-interactive
%option prefix="code_" outfile="lex.yy.c"
%{
-#include
-#include "system.h"
-
/* Work around a bug in flex 2.5.31. See Debian bug 333231
. */
#undef code_wrap
#define code_wrap() 1
#define FLEX_PREFIX(Id) code_ ## Id
-#include "complain.h"
#include "flex-scanner.h"
+
+#include "complain.h"
#include "reader.h"
#include "getargs.h"
-#include
+#include "scan-code.h"
+#include "symlist.h"
+
+#include
#include
#include
-#include "scan-code.h"
-
/* The current calling start condition: SC_RULE_ACTION or
SC_SYMBOL_ACTION. */
-# define YY_DECL const char *code_lex (int sc_context, symbol_list *rule)
+# define YY_DECL static char *code_lex (code_props *self, int sc_context)
YY_DECL;
#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);
+
+/* A string to be pushed to obstack after dollar/at has been handled. */
+static char *ref_tail_fields;
+
static location the_location;
static location *loc = &the_location;
+
+/* A string representing the most recent translation. */
+static char *last_string;
+
+/* True if an untyped $$ or $n was seen. */
+static bool untyped_var_seen;
+
%}
/* C and C++ comments in code. */
%x SC_COMMENT SC_LINE_COMMENT
@@ -74,23 +84,47 @@ tag [^\0\n>]+
white space between the backslash and the newline. */
splice (\\[ \f\t\v]*\n)*
+/* C style identifier. Must start with letter. Will be used for
+ named symbol references. Shall be kept synchronized with
+ scan-gram.l "letter" and "id". */
+letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id {letter}({letter}|[-0-9])*
+ref -?[0-9]+|{id}|"["{id}"]"|"$"
+
%%
%{
/* Nesting level of the current code in braces. */
- int braces_level IF_LINT (= 0);
+ 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. */
- assert (sc_context == SC_SYMBOL_ACTION
- || sc_context == SC_RULE_ACTION
- || sc_context == INITIAL);
+ aver (sc_context == SC_SYMBOL_ACTION
+ || 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. |
`------------------------------------------------------------*/
@@ -100,7 +134,7 @@ splice (\\[ \f\t\v]*\n)*
/*--------------------------------------------------------------.
- | Scanning a line comment. The initial `//' is already eaten. |
+ | Scanning a line comment. The initial '//' is already eaten. |
`--------------------------------------------------------------*/
@@ -130,14 +164,17 @@ splice (\\[ \f\t\v]*\n)*
}
-{
+
+{
"'" {
STRING_GROW;
BEGIN SC_CHARACTER;
+ need_semicolon = true;
}
"\"" {
STRING_GROW;
BEGIN SC_STRING;
+ need_semicolon = true;
}
"/"{splice}"*" {
STRING_GROW;
@@ -147,79 +184,492 @@ splice (\\[ \f\t\v]*\n)*
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;
+ }
}
{
- "$"("<"{tag}">")?(-?[0-9]+|"$") handle_action_dollar (rule, yytext, *loc);
- "@"(-?[0-9]+|"$") handle_action_at (rule, yytext, *loc);
-
- "$" {
- warn_at (*loc, _("stray `$'"));
- obstack_sgrow (&obstack_for_string, "$][");
+ "$"("<"{tag}">")?{ref} {
+ ref_tail_fields = NULL;
+ handle_action_dollar (self->rule, yytext, *loc);
+ if (ref_tail_fields)
+ obstack_sgrow (&obstack_for_string, ref_tail_fields);
+ need_semicolon = true;
}
- "@" {
- warn_at (*loc, _("stray `@'"));
- obstack_sgrow (&obstack_for_string, "@@");
+ "@"{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; ++braces_level;
+ ";" STRING_GROW; need_semicolon = false;
+ "{" STRING_GROW; ++braces_level; need_semicolon = false;
"}" {
- bool outer_brace = --braces_level < 0;
+ 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
- not append one.
-
- FIXME: Bison should warn if a semicolon seems to be necessary
- here, and should omit the semicolon if it seems unnecessary
- (e.g., after ';', '{', or '}', each followed by comments or
- white space). Such a warning shouldn't depend on --yacc; it
- should depend on a new --pedantic option, which would cause
- Bison to warn if it detects an extension to POSIX. --pedantic
- should also diagnose other Bison extensions like %yacc.
- Perhaps there should also be a GCC-style --pedantic-errors
- option, so that such warnings are diagnosed as errors. */
- if (outer_brace && ! yacc_flag)
- obstack_1grow (&obstack_for_string, ';');
+ ';'. 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, ';');
+ }
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;
}
{
- "$$" obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
- "@$" obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
+ "$"("<"{tag}">")?"$" {
+ const char *type_name = NULL;
+ fetch_type_name (yytext + 1, &type_name, *loc)[-1] = 0;
+ obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar(");
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
+ self->is_value_used = true;
+ }
+ "@$" {
+ obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
+ locations_flag = 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. */
+ .|\n STRING_GROW;
+
+ /* End of processing. */
+ <> STRING_FINISH; return last_string;
+}
+
+%%
+
+static inline bool
+is_dot_or_dash (char ch)
+{
+ return ch == '.' || ch == '-';
}
- /*-----------------------------------------------------.
- | By default, grow the string obstack with the input. |
- `-----------------------------------------------------*/
+static inline bool
+contains_dot_or_dash (const char* p)
+{
+ for (; *p; ++p)
+ if (is_dot_or_dash (*p))
+ return true;
+ return false;
+}
-<*>.|\n STRING_GROW;
+/* Defines a variant of a symbolic name resolution. */
+typedef struct
+{
+ /* Index in symbol list. */
+ unsigned symbol_index;
- /* End of processing. */
-<*><> {
- obstack_1grow (&obstack_for_string, '\0');
- return obstack_finish (&obstack_for_string);
- }
+ /* Matched symbol id and loc. */
+ uniqstr id;
+ location loc;
-%%
+ /* Hiding named reference. */
+ named_ref* hidden_by;
+
+ /* Error flags. May contain zero (no errors) or
+ a combination of VARIANT_* values. */
+ unsigned err;
+} variant;
+
+/* Set when the variant refers to a symbol hidden
+ by an explicit symbol reference. */
+#define VARIANT_HIDDEN (1 << 0)
+
+/* Set when the variant refers to a symbol containing
+ dots or dashes. Will require explicit bracketing. */
+#define VARIANT_BAD_BRACKETING (1 << 1)
+
+/* Set when the variant refers to a symbol which is
+ not visible from current midrule. */
+#define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 2)
+
+static variant *variant_table = NULL;
+static unsigned variant_table_size = 0;
+static unsigned variant_count = 0;
+
+static variant *
+variant_table_grow (void)
+{
+ ++variant_count;
+ if (variant_count > variant_table_size)
+ {
+ while (variant_count > variant_table_size)
+ variant_table_size = 2 * variant_table_size + 3;
+ variant_table = xnrealloc (variant_table, variant_table_size,
+ sizeof *variant_table);
+ }
+ return &variant_table[variant_count - 1];
+}
+
+static void
+variant_table_free (void)
+{
+ free (variant_table);
+ variant_table = NULL;
+ variant_table_size = variant_count = 0;
+}
+
+static char *
+find_prefix_end (const char *prefix, char *begin, char *end)
+{
+ char *ptr = begin;
+
+ for (; *prefix && ptr != end; ++prefix, ++ptr)
+ if (*prefix != *ptr)
+ return 0;
+
+ if (*prefix)
+ return 0;
+
+ return ptr;
+}
+
+static variant *
+variant_add (uniqstr id, location id_loc, unsigned symbol_index,
+ 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 ||
+ (!explicit_bracketing && is_dot_or_dash (*prefix_end))))
+ {
+ variant *r = variant_table_grow ();
+ r->symbol_index = symbol_index;
+ r->id = id;
+ r->loc = id_loc;
+ r->hidden_by = NULL;
+ r->err = 0;
+ return r;
+ }
+ else
+ return NULL;
+}
+
+static const char *
+get_at_spec (unsigned symbol_index)
+{
+ static char at_buf[20];
+ if (symbol_index == 0)
+ strcpy (at_buf, "$$");
+ else
+ snprintf (at_buf, sizeof at_buf, "$%u", symbol_index);
+ 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 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 $-n "deep" stack
+ accesses. */
+static long int
+parse_ref (char *cp, symbol_list *rule, int rule_length,
+ int midrule_rhs_index, char *text, location text_loc,
+ char dollar_or_at)
+{
+ symbol_list *l;
+ char *cp_end;
+ bool explicit_bracketing;
+ unsigned i;
+ unsigned valid_variants = 0;
+ unsigned valid_variant_index = 0;
+
+ if ('$' == *cp)
+ return LHS_REF;
+
+ if (c_isdigit (*cp) || (*cp == '-' && c_isdigit (* (cp + 1))))
+ {
+ long int num = strtol (cp, &cp, 10);
+ if (1 - INT_MAX + rule_length <= num && num <= rule_length)
+ return num;
+ else
+ {
+ complain_at (text_loc, _("integer out of range: %s"),
+ quote (text));
+ return INVALID_REF;
+ }
+ }
+
+ if ('[' == *cp)
+ {
+ /* Ignore the brackets. */
+ char *p;
+ for (p = ++cp; *p != ']'; ++p)
+ continue;
+ cp_end = p;
+
+ 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;
+ }
+ for (p = cp; *p; ++p)
+ continue;
+ cp_end = p;
+
+ explicit_bracketing = false;
+ }
+
+ /* Add all relevant variants. */
+ {
+ unsigned symbol_index;
+ variant_count = 0;
+ 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, 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 errors. */
+ for (i = 0; i < variant_count; ++i)
+ {
+ variant *var = &variant_table[i];
+ 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;
+
+ /* Check correct bracketing. */
+ 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;
+
+ if (!var->err)
+ {
+ valid_variant_index = i;
+ ++valid_variants;
+ }
+ }
+
+ switch (valid_variants)
+ {
+ 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;
+}
/* Keeps track of the maximum number of semantic values to the left of
a handle (those referenced by $0, $-1, etc.) are required by the
@@ -227,8 +677,33 @@ splice (\\[ \f\t\v]*\n)*
int max_left_semantic_context = 0;
+/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
+ beginning (i.e., after the opening "<", and return the pointer
+ immediately after it. */
+
+static
+char *
+fetch_type_name (char *cp, char const **type_name,
+ location dollar_loc)
+{
+ if (*cp == '<')
+ {
+ *type_name = ++cp;
+ while (*cp != '>')
+ ++cp;
+
+ /* The '>' symbol will be later replaced by '\0'. Original
+ 'text' is needed for error messages. */
+ ++cp;
+ if (untyped_var_seen)
+ complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+ tag_seen = true;
+ }
+ return cp;
+}
+
/*------------------------------------------------------------------.
-| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
+| TEXT is pointing to a wannabee semantic value (i.e., a '$'). |
| |
| Possible inputs: $[]($|integer) |
| |
@@ -238,64 +713,95 @@ int max_left_semantic_context = 0;
static void
handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
{
- const char *type_name = NULL;
+ char const *type_name = NULL;
char *cp = text + 1;
- int rule_length = symbol_list_length (rule->next);
+ symbol_list *effective_rule;
+ int effective_rule_length;
+ int n;
- /* Get the type name if explicit. */
- if (*cp == '<')
+ if (rule->midrule_parent_rule)
{
- type_name = ++cp;
- while (*cp != '>')
- ++cp;
- *cp = '\0';
- ++cp;
+ effective_rule = rule->midrule_parent_rule;
+ effective_rule_length = rule->midrule_parent_rhs_index - 1;
}
+ else
+ {
+ effective_rule = rule;
+ effective_rule_length = symbol_list_length (rule->next);
+ }
+
+ /* Get the type name if explicit. */
+ cp = fetch_type_name (cp, &type_name, dollar_loc);
- if (*cp == '$')
+ n = parse_ref (cp, effective_rule, effective_rule_length,
+ rule->midrule_parent_rhs_index, text, dollar_loc, '$');
+
+ /* End type_name. */
+ if (type_name)
+ cp[-1] = '\0';
+
+ switch (n)
{
+ case INVALID_REF:
+ break;
+
+ case LHS_REF:
if (!type_name)
type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
- if (!type_name && typed)
- complain_at (dollar_loc, _("$$ of `%s' has no declared type"),
- rule->sym->tag);
+
if (!type_name)
- type_name = "";
- obstack_fgrow1 (&obstack_for_string,
- "]b4_lhs_value([%s])[", type_name);
- rule->used = true;
- }
- else
- {
- long int num;
- set_errno (0);
- num = strtol (cp, 0, 10);
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
- {
- int n = num;
- if (1-n > max_left_semantic_context)
- max_left_semantic_context = 1-n;
- if (!type_name && n > 0)
- type_name =
- symbol_list_n_type_name_get (rule, dollar_loc, n);
- if (!type_name && typed)
- complain_at (dollar_loc, _("$%d of `%s' has no declared type"),
- n, rule->sym->tag);
- if (!type_name)
- type_name = "";
- obstack_fgrow3 (&obstack_for_string,
- "]b4_rhs_value(%d, %d, [%s])[",
- rule_length, n, type_name);
- symbol_list_n_used_set (rule, n, true);
- }
- else
- complain_at (dollar_loc, _("integer out of range: %s"), quote (text));
+ {
+ if (union_seen | tag_seen)
+ {
+ if (rule->midrule_parent_rule)
+ complain_at (dollar_loc,
+ _("$$ 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;
+
+ default:
+ if (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);
+ if (!type_name)
+ {
+ if (union_seen | tag_seen)
+ complain_at (dollar_loc, _("$%s of %s has no declared type"),
+ cp, quote (effective_rule->content.sym->tag));
+ else
+ untyped_var_seen = true;
+ }
+
+ obstack_printf (&obstack_for_string,
+ "]b4_rhs_value(%d, %d, ", effective_rule_length, n);
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
+ if (n > 0)
+ symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
+ true;
+ break;
}
}
/*------------------------------------------------------.
-| TEXT is a location token (i.e., a `@...'). Output to |
+| TEXT is a location token (i.e., a '@...'). Output to |
| OBSTACK_FOR_STRING a reference to this location. |
`------------------------------------------------------*/
@@ -303,25 +809,38 @@ static void
handle_action_at (symbol_list *rule, char *text, location at_loc)
{
char *cp = text + 1;
- int rule_length = symbol_list_length (rule->next);
- locations_flag = true;
+ symbol_list *effective_rule;
+ int effective_rule_length;
+ int n;
- if (*cp == '$')
- obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
+ if (rule->midrule_parent_rule)
+ {
+ effective_rule = rule->midrule_parent_rule;
+ effective_rule_length = rule->midrule_parent_rhs_index - 1;
+ }
else
{
- long int num;
- set_errno (0);
- num = strtol (cp, 0, 10);
+ effective_rule = rule;
+ effective_rule_length = symbol_list_length (rule->next);
+ }
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
- {
- int n = num;
- obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
- rule_length, n);
- }
- else
- complain_at (at_loc, _("integer out of range: %s"), quote (text));
+ locations_flag = true;
+
+ n = parse_ref (cp, effective_rule, effective_rule_length,
+ rule->midrule_parent_rhs_index, text, at_loc, '@');
+ switch (n)
+ {
+ case INVALID_REF:
+ break;
+
+ case LHS_REF:
+ obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
+ break;
+
+ default:
+ obstack_printf (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
+ effective_rule_length, n);
+ break;
}
}
@@ -330,58 +849,109 @@ handle_action_at (symbol_list *rule, char *text, location at_loc)
| Initialize the scanner. |
`-------------------------*/
-/* Translate the dollars and ats in \a a, whose location is l.
- Depending on the \a sc_context (SC_RULE_ACTION, SC_SYMBOL_ACTION,
- INITIAL), the processing is different. */
+/* Translate the dollars and ats in \a self, in the context \a sc_context
+ (SC_RULE_ACTION, SC_SYMBOL_ACTION, INITIAL). */
-static const char *
-translate_action (int sc_context, symbol_list *rule, const char *a, location l)
+static char const *
+translate_action (code_props *self, int sc_context)
{
- const char *res;
+ char *res;
static bool initialized = false;
if (!initialized)
{
obstack_init (&obstack_for_string);
- /* The initial buffer, never used. */
- yy_delete_buffer (YY_CURRENT_BUFFER);
yy_flex_debug = 0;
initialized = true;
}
- loc->start = loc->end = l.start;
- yy_switch_to_buffer (yy_scan_string (a));
- res = code_lex (sc_context, rule);
+ loc->start = loc->end = self->location.start;
+ yy_switch_to_buffer (yy_scan_string (self->code));
+ res = code_lex (self, sc_context);
yy_delete_buffer (YY_CURRENT_BUFFER);
return res;
}
-const char *
-translate_rule_action (symbol_list *rule, const char *a, location l)
+/*------------------------------------------------------------------------.
+| Implementation of the public interface as documented in "scan-code.h". |
+`------------------------------------------------------------------------*/
+
+void
+code_props_none_init (code_props *self)
+{
+ *self = code_props_none;
+}
+
+code_props const code_props_none = CODE_PROPS_NONE_INIT;
+
+void
+code_props_plain_init (code_props *self, char const *code,
+ location code_loc)
+{
+ 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)
{
- return translate_action (SC_RULE_ACTION, rule, a, l);
+ 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;
}
-const char *
-translate_symbol_action (const char *a, location l)
+void
+code_props_rule_action_init (code_props *self, char const *code,
+ location code_loc, symbol_list *rule,
+ named_ref *name)
{
- return translate_action (SC_SYMBOL_ACTION, NULL, a, l);
+ 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;
}
-const char *
-translate_code (const char *a, location l)
+void
+code_props_translate_code (code_props *self)
{
- return translate_action (INITIAL, NULL, a, l);
+ switch (self->kind)
+ {
+ case CODE_PROPS_NONE:
+ break;
+ case CODE_PROPS_PLAIN:
+ self->code = translate_action (self, INITIAL);
+ break;
+ case CODE_PROPS_SYMBOL_ACTION:
+ self->code = translate_action (self, SC_SYMBOL_ACTION);
+ break;
+ case CODE_PROPS_RULE_ACTION:
+ self->code = translate_action (self, SC_RULE_ACTION);
+ break;
+ }
}
-/*-----------------------------------------------.
-| Free all the memory allocated to the scanner. |
-`-----------------------------------------------*/
+void
+code_scanner_last_string_free (void)
+{
+ STRING_FREE;
+}
void
code_scanner_free (void)
{
obstack_free (&obstack_for_string, 0);
+ variant_table_free ();
+
/* Reclaim Flex's buffers. */
- yy_delete_buffer (YY_CURRENT_BUFFER);
+ yylex_destroy ();
}