/* 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,
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 <http://www.gnu.org/licenses/>. */
-%option debug nodefault nounput noyywrap never-interactive
+%option debug nodefault noinput nounput noyywrap never-interactive
%option prefix="code_" outfile="lex.yy.c"
%{
#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 <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>
#include <quote.h>
-#include "scan-code.h"
-
/* The current calling start condition: SC_RULE_ACTION or
SC_SYMBOL_ACTION. */
-# define YY_DECL 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);
+ 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 $n was seen. */
static bool untyped_var_seen;
+
%}
/* C and C++ comments in code. */
%x SC_COMMENT SC_LINE_COMMENT
/* POSIX says that a tag must be both an id and a C union member, but
historically almost any character is allowed in a tag. We disallow
NUL and newline, as this simplifies our implementation. */
-tag [^\0\n>]+
+tag [^\0\n>]+
/* Zero or more instances of backslash-newline. Following GCC, allow
white space between the backslash and the newline. */
-splice (\\[ \f\t\v]*\n)*
+splice (\\[ \f\t\v]*\n)*
+
+/* C style identifier. Must start with letter. Will be used for
+ named symbol references. Shall be kept synchronized with
+ scan-gram.l "letter" and "id". */
+letter [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id {letter}({letter}|[-0-9])*
+ref -?[0-9]+|{id}|"["{id}"]"|"$"
%%
/* 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;
%}
/*------------------------------------------------------------.
- | 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;
}
-<SC_RULE_ACTION,SC_SYMBOL_ACTION>{
+<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;
STRING_GROW;
BEGIN SC_LINE_COMMENT;
}
+ [$@] {
+ complain_at (*loc, Wother, _("stray '%s'"), yytext);
+ obstack_escape (&obstack_for_string, yytext);
+ need_semicolon = true;
+ }
+ [\[\]] {
+ obstack_escape (&obstack_for_string, yytext);
+ need_semicolon = true;
+ }
}
<SC_RULE_ACTION>
{
- "$"("<"{tag}">")?(-?[0-9]+|"$") 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)
+ {
+ complain_at (*loc, Wdeprecated,
+ _("a ';' might be needed at the end of action code"));
+ complain_at (*loc, Wdeprecated,
+ _("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;
+ . STRING_GROW; need_semicolon = true;
}
<SC_SYMBOL_ACTION>
{
- "$$" 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[");
+ muscle_percent_define_ensure("locations", the_location, 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;
+ /* By default, grow the string obstack with the input. */
+ .|\n STRING_GROW;
/* End of processing. */
-<*><<EOF>> {
- obstack_1grow (&obstack_for_string, '\0');
- return obstack_finish (&obstack_for_string);
- }
+ <<EOF>> STRING_FINISH; return last_string;
+}
%%
+static inline bool
+is_dot_or_dash (char ch)
+{
+ return ch == '.' || ch == '-';
+}
+
+static inline bool
+contains_dot_or_dash (const char* p)
+{
+ for (; *p; ++p)
+ if (is_dot_or_dash (*p))
+ return true;
+ return false;
+}
+
+/* Defines a variant of a symbolic name resolution. */
+typedef struct
+{
+ /* Index in symbol list. */
+ unsigned symbol_index;
+
+ /* 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_message (const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ warnings wflags, unsigned indent,
+ const variant *var)
+{
+ const char *at_spec = get_at_spec (var->symbol_index);
+
+ if (var->err == 0)
+ complain_at_indent (var->loc, wflags, &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)
+ obstack_printf (&msg_buf,
+ _(", cannot be accessed from mid-rule action at $%d"),
+ midrule_rhs_index);
+
+ complain_at_indent (id_loc, wflags, &indent, "%s",
+ obstack_finish0 (&msg_buf));
+ obstack_free (&msg_buf, 0);
+ }
+}
+
+static void
+show_sub_messages (const char* cp, bool explicit_bracketing,
+ int midrule_rhs_index, char dollar_or_at,
+ warnings wflags, unsigned indent)
+{
+ unsigned i;
+
+ for (i = 0; i < variant_count; ++i)
+ show_sub_message (cp, explicit_bracketing,
+ midrule_rhs_index, dollar_or_at,
+ wflags, indent, &variant_table[i]);
+}
+
+/* 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, complaint, _("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, 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;
+ complain_at_indent (sym_loc, complaint, &indent,
+ _("syntax error after '%c', expecting integer, "
+ "letter, '_', '[', or '$'"),
+ dollar_or_at);
+ }
+ else if (midrule_rhs_index)
+ complain_at_indent (rule->location, complaint, &indent,
+ _("symbol not found in production before $%d: "
+ "%.*s"),
+ midrule_rhs_index, len, cp);
+ else
+ complain_at_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, complaint, 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, Wother, 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, complaint, &indent,
+ _("ambiguous reference: %s"), quote (text));
+ show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
+ dollar_or_at, complaint, 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, $-1, etc.) are required by the
semantic actions of this grammar. */
int max_left_semantic_context = 0;
+/* If CP points to a typename (i.e., <.*?>), set TYPE_NAME to its
+ beginning (i.e., after the opening "<", and return the pointer
+ immediately after it. */
+
+static
+char *
+fetch_type_name (char *cp, char const **type_name,
+ location dollar_loc)
+{
+ if (*cp == '<')
+ {
+ *type_name = ++cp;
+ while (*cp != '>')
+ ++cp;
+
+ /* The '>' symbol will be later replaced by '\0'. Original
+ 'text' is needed for error messages. */
+ ++cp;
+ if (untyped_var_seen)
+ complain_at (dollar_loc, complaint,
+ _("explicit type given in untyped grammar"));
+ tag_seen = true;
+ }
+ return cp;
+}
+
/*------------------------------------------------------------------.
-| TEXT is pointing to a wannabee semantic value (i.e., a `$'). |
+| TEXT is pointing to a wannabee semantic value (i.e., a '$'). |
| |
| Possible inputs: $[<TYPENAME>]($|integer) |
| |
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;
symbol_list *effective_rule;
int effective_rule_length;
+ int n;
if (rule->midrule_parent_rule)
{
}
/* Get the type name if explicit. */
- if (*cp == '<')
- {
- type_name = ++cp;
- while (*cp != '>')
- ++cp;
- *cp = '\0';
- ++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, '$');
+
+ /* End type_name. */
+ if (type_name)
+ cp[-1] = '\0';
- if (*cp == '$')
+ switch (n)
{
+ case INVALID_REF:
+ break;
+
+ 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 = "";
- }
-
- obstack_fgrow1 (&obstack_for_string,
- "]b4_lhs_value([%s])[", type_name);
- rule->used = true;
- }
- else
- {
- long int num = strtol (cp, NULL, 10);
-
- if (1 - INT_MAX + effective_rule_length <= num
- && num <= effective_rule_length)
- {
- int n = num;
- 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, _("$%d of `%s' has no declared type"),
- n, 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);
- symbol_list_n_used_set (effective_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, 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));
+ }
+ 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, complaint,
+ _("$%s of %s has no declared type"), cp,
+ quote (effective_rule->content.sym->tag));
+ else
+ untyped_var_seen = true;
+ }
+
+ obstack_printf (&obstack_for_string,
+ "]b4_rhs_value(%d, %d, ", effective_rule_length, n);
+ obstack_quote (&obstack_for_string, type_name);
+ obstack_sgrow (&obstack_for_string, ")[");
+ if (n > 0)
+ symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
+ true;
+ break;
}
}
/*------------------------------------------------------.
-| TEXT is a location token (i.e., a `@...'). Output to |
+| TEXT is a location token (i.e., a '@...'). Output to |
| OBSTACK_FOR_STRING a reference to this location. |
`------------------------------------------------------*/
handle_action_at (symbol_list *rule, char *text, location at_loc)
{
char *cp = text + 1;
- int effective_rule_length =
- (rule->midrule_parent_rule
- ? rule->midrule_parent_rhs_index - 1
- : symbol_list_length (rule->next));
-
- locations_flag = true;
+ symbol_list *effective_rule;
+ int effective_rule_length;
+ int n;
- if (*cp == '$')
- 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 = strtol (cp, NULL, 10);
-
- if (1 - INT_MAX + effective_rule_length <= num
- && num <= effective_rule_length)
- {
- int n = num;
- obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
- effective_rule_length, n);
- }
- else
- complain_at (at_loc, _("integer out of range: %s"), quote (text));
+ effective_rule = rule;
+ effective_rule_length = symbol_list_length (rule->next);
+ }
+
+ 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, '@');
+ 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;
}
}
| Initialize the scanner. |
`-------------------------*/
-/* Translate the dollars and ats in \a a, whose location is \a l. The
- translation is for \a rule, in the context \a sc_context
+/* Translate the dollars and ats in \a self, in the context \a sc_context
(SC_RULE_ACTION, SC_SYMBOL_ACTION, INITIAL). */
static char const *
-translate_action (int sc_context, symbol_list *rule, char const *a, location l)
+translate_action (code_props *self, int sc_context)
{
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;
}
-char const *
-translate_rule_action (symbol_list *rule)
+/*------------------------------------------------------------------------.
+| Implementation of the public interface as documented in "scan-code.h". |
+`------------------------------------------------------------------------*/
+
+void
+code_props_none_init (code_props *self)
{
- return translate_action (SC_RULE_ACTION, rule, rule->action,
- rule->action_location);
+ *self = code_props_none;
}
-char const *
-translate_symbol_action (char const *a, location l)
+code_props code_props_none = CODE_PROPS_NONE_INIT;
+
+void
+code_props_plain_init (code_props *self, char const *code,
+ location code_loc)
{
- return translate_action (SC_SYMBOL_ACTION, NULL, a, l);
+ code_props_none_init (self);
+ self->kind = CODE_PROPS_PLAIN;
+ self->code = code;
+ self->location = code_loc;
}
-char const *
-translate_code (char const *a, location l)
+void
+code_props_symbol_action_init (code_props *self, char const *code,
+ location code_loc)
{
- return translate_action (INITIAL, NULL, a, l);
+ code_props_none_init (self);
+ self->kind = CODE_PROPS_SYMBOL_ACTION;
+ self->code = code;
+ self->location = code_loc;
}
-/*-----------------------------------------------.
-| Free all the memory allocated to the scanner. |
-`-----------------------------------------------*/
+void
+code_props_rule_action_init (code_props *self, char const *code,
+ location code_loc, symbol_list *rule,
+ 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->rule = rule;
+ self->named_ref = name;
+ self->is_predicate = is_predicate;
+}
+
+void
+code_props_translate_code (code_props *self)
+{
+ 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;
+ }
+}
+
+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 ();
}
projects / bison.git / blobdiff