/* Bison Action Scanner -*- C -*-
- Copyright (C) 2006 Free Software Foundation, Inc.
+ Copyright (C) 2006, 2007, 2008 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 prefix="code_" outfile="lex.yy.c"
#define FLEX_PREFIX(Id) code_ ## Id
#include "flex-scanner.h"
+
+#include "complain.h"
#include "reader.h"
#include "getargs.h"
-#include <assert.h>
#include <get-errno.h>
#include <quote.h>
#include "scan-code.h"
+#include "symlist.h"
/* The current calling start condition: SC_RULE_ACTION or
SC_SYMBOL_ACTION. */
-# define YY_DECL const char *code_lex (int sc_context)
+# 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 void handle_action_dollar (char *cp, location loc);
-static void handle_action_at (char *cp, location 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);
static location the_location;
static location *loc = &the_location;
-/* The rule being processed. */
-symbol_list *current_rule;
+/* 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
%%
%{
+ /* Nesting level of the current code in braces. */
+ int braces_level = 0;
+
/* 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;
%}
<SC_RULE_ACTION>
{
- "$"("<"{tag}">")?(-?[0-9]+|"$") handle_action_dollar (yytext, *loc);
- "@"(-?[0-9]+|"$") handle_action_at (yytext, *loc);
+ "$"("<"{tag}">")?(-?[0-9]+|"$") {
+ handle_action_dollar (self->rule, yytext, *loc);
+ }
+ "@"(-?[0-9]+|"$") {
+ handle_action_at (self->rule, yytext, *loc);
+ }
"$" {
warn_at (*loc, _("stray `$'"));
warn_at (*loc, _("stray `@'"));
obstack_sgrow (&obstack_for_string, "@@");
}
+
+ "{" STRING_GROW; ++braces_level;
+ "}" {
+ 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. Also, some output languages (like Java) do not
+ accept an extra semicolon, so don't append if the user specified
+ a skeleton or language.
+
+ 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 && language_prio == default_prio
+ && skeleton_prio == default_prio)
+ obstack_1grow (&obstack_for_string, ';');
+
+ STRING_GROW;
+ }
}
<SC_SYMBOL_ACTION>
{
- "$$" obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
- "@$" obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
+ "$$" {
+ obstack_sgrow (&obstack_for_string, "]b4_dollar_dollar[");
+ self->is_value_used = true;
+ }
+ "@$" {
+ obstack_sgrow (&obstack_for_string, "]b4_at_dollar[");
+ locations_flag = true;
+ }
}
/* End of processing. */
<*><<EOF>> {
- obstack_1grow (&obstack_for_string, '\0');
- return obstack_finish (&obstack_for_string);
+ STRING_FINISH;
+ return last_string;
}
%%
`------------------------------------------------------------------*/
static void
-handle_action_dollar (char *text, location loc)
+handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
{
- const char *type_name = NULL;
+ char const *type_name = NULL;
char *cp = text + 1;
- int rule_length = symbol_list_length (current_rule->next);
+ symbol_list *effective_rule;
+ int effective_rule_length;
+
+ if (rule->midrule_parent_rule)
+ {
+ effective_rule = rule->midrule_parent_rule;
+ effective_rule_length = rule->midrule_parent_rhs_index - 1;
+ }
+ else
+ {
+ effective_rule = rule;
+ effective_rule_length = symbol_list_length (rule->next);
+ }
/* Get the type name if explicit. */
if (*cp == '<')
++cp;
*cp = '\0';
++cp;
+ if (untyped_var_seen)
+ complain_at (dollar_loc, _("explicit type given in untyped grammar"));
+ tag_seen = true;
}
if (*cp == '$')
{
if (!type_name)
- type_name = symbol_list_n_type_name_get (current_rule, loc, 0);
- if (!type_name && typed)
- complain_at (loc, _("$$ of `%s' has no declared type"),
- current_rule->sym->tag);
+ type_name = symbol_list_n_type_name_get (rule, dollar_loc, 0);
+
if (!type_name)
- 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);
- current_rule->used = true;
+ rule->action_props.is_value_used = true;
}
else
{
- long int num;
- set_errno (0);
- num = strtol (cp, 0, 10);
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
+ long int num = strtol (cp, NULL, 10);
+
+ if (1 - INT_MAX + effective_rule_length <= num
+ && num <= effective_rule_length)
{
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 (current_rule, loc, n);
- if (!type_name && typed)
- complain_at (loc, _("$%d of `%s' has no declared type"),
- n, current_rule->sym->tag);
+ if (max_left_semantic_context < 1 - n)
+ max_left_semantic_context = 1 - n;
+ if (!type_name && 0 < n)
+ type_name =
+ symbol_list_n_type_name_get (effective_rule, dollar_loc, n);
if (!type_name)
- type_name = "";
+ {
+ if (union_seen | tag_seen)
+ complain_at (dollar_loc, _("$%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])[",
- rule_length, n, type_name);
- symbol_list_n_used_set (current_rule, n, true);
+ effective_rule_length, n, type_name);
+ if (n > 0)
+ symbol_list_n_get (effective_rule, n)->action_props.is_value_used =
+ true;
}
else
- complain_at (loc, _("integer out of range: %s"), quote (text));
+ complain_at (dollar_loc, _("integer out of range: %s"), quote (text));
}
}
`------------------------------------------------------*/
static void
-handle_action_at (char *text, location loc)
+handle_action_at (symbol_list *rule, char *text, location at_loc)
{
char *cp = text + 1;
- int rule_length = symbol_list_length (current_rule->next);
+ int effective_rule_length =
+ (rule->midrule_parent_rule
+ ? rule->midrule_parent_rhs_index - 1
+ : symbol_list_length (rule->next));
+
locations_flag = true;
if (*cp == '$')
obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
else
{
- long int num;
- set_errno (0);
- num = strtol (cp, 0, 10);
+ long int num = strtol (cp, NULL, 10);
- if (INT_MIN <= num && num <= rule_length && ! get_errno ())
+ 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)[",
- rule_length, n);
+ effective_rule_length, n);
}
else
- complain_at (loc, _("integer out of range: %s"), quote (text));
+ complain_at (at_loc, _("integer out of range: %s"), quote (text));
}
}
| 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, 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);
+ 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 *r, const char *a, location l)
+/*------------------------------------------------------------------------.
+| Implementation of the public interface as documented in "scan-code.h". |
+`------------------------------------------------------------------------*/
+
+void
+code_props_none_init (code_props *self)
{
- current_rule = r;
- return translate_action (SC_RULE_ACTION, a, l);
+ *self = code_props_none;
}
-const char *
-translate_symbol_action (const char *a, location l)
+code_props const 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, a, l);
+ self->kind = CODE_PROPS_PLAIN;
+ self->code = code;
+ self->location = code_loc;
+ self->is_value_used = false;
+ self->rule = NULL;
}
-const char *
-translate_code (const char *a, location l)
+void
+code_props_symbol_action_init (code_props *self, char const *code,
+ location code_loc)
{
- return translate_action (INITIAL, a, l);
+ self->kind = CODE_PROPS_SYMBOL_ACTION;
+ self->code = code;
+ self->location = code_loc;
+ self->is_value_used = false;
+ self->rule = NULL;
}
-/*-----------------------------------------------.
-| 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)
+{
+ self->kind = CODE_PROPS_RULE_ACTION;
+ self->code = code;
+ self->location = code_loc;
+ self->is_value_used = false;
+ self->rule = rule;
+}
+
+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);
/* Reclaim Flex's buffers. */
- yy_delete_buffer (YY_CURRENT_BUFFER);
+ yylex_destroy ();
}
projects / bison.git / blobdiff