/* Bison Grammar Scanner -*- C -*-
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
02111-1307 USA
*/
-%option debug nodefault noyywrap never-interactive
+%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
scanner_cursor.file = current_file; \
scanner_cursor.line = 1; \
scanner_cursor.column = 1; \
+ code_start = scanner_cursor; \
} \
while (0)
static void handle_dollar (int token_type, char *cp, location loc);
static void handle_at (int token_type, char *cp, location loc);
static void handle_syncline (char *args);
+static unsigned long int scan_integer (char const *p, int base, location loc);
static int convert_ucn_to_byte (char const *hex_text);
-static void unexpected_end_of_file (boundary, char const *);
+static void unexpected_eof (boundary, char const *);
+static void unexpected_newline (boundary, char const *);
%}
%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
int token_type IF_LINT (= 0);
/* Location of most recent identifier, when applicable. */
- location id_loc IF_LINT (= *loc);
+ location id_loc IF_LINT (= empty_location);
- /* Where containing code started, when applicable. */
- boundary code_start IF_LINT (= loc->start);
+ /* Where containing code started, when applicable. Its initial
+ value is relevant only when yylex is invoked in the SC_EPILOGUE
+ start condition. */
+ boundary code_start = scanner_cursor;
/* Where containing comment or string or character literal started,
when applicable. */
- boundary token_start IF_LINT (= loc->start);
+ boundary token_start IF_LINT (= scanner_cursor);
%}
<INITIAL,SC_AFTER_IDENTIFIER,SC_PRE_CODE>
{
- [ \f\n\t\v] ;
-
- /* Comments. */
- "/*" token_start = loc->start; context_state = YY_START; BEGIN SC_YACC_COMMENT;
+ /* Comments and white space. */
+ "," warn_at (*loc, _("stray `,' treated as white space"));
+ [ \f\n\t\v] |
"//".* ;
+ "/*" {
+ token_start = loc->start;
+ context_state = YY_START;
+ BEGIN SC_YACC_COMMENT;
+ }
/* #line directives are not documented, and may be withdrawn or
modified in future versions of Bison. */
{
"%binary" return PERCENT_NONASSOC;
"%debug" return PERCENT_DEBUG;
+ "%default"[-_]"prec" return PERCENT_DEFAULT_PREC;
"%define" return PERCENT_DEFINE;
"%defines" return PERCENT_DEFINES;
"%destructor" token_type = PERCENT_DESTRUCTOR; BEGIN SC_PRE_CODE;
"%dprec" return PERCENT_DPREC;
"%error"[-_]"verbose" return PERCENT_ERROR_VERBOSE;
"%expect" return PERCENT_EXPECT;
+ "%expect"[-_]"rr" return PERCENT_EXPECT_RR;
"%file-prefix" return PERCENT_FILE_PREFIX;
"%fixed"[-_]"output"[-_]"files" return PERCENT_YACC;
+ "%initial-action" token_type = PERCENT_INITIAL_ACTION; BEGIN SC_PRE_CODE;
"%glr-parser" return PERCENT_GLR_PARSER;
"%left" return PERCENT_LEFT;
"%lex-param" token_type = PERCENT_LEX_PARAM; BEGIN SC_PRE_CODE;
"%locations" return PERCENT_LOCATIONS;
"%merge" return PERCENT_MERGE;
"%name"[-_]"prefix" return PERCENT_NAME_PREFIX;
+ "%no"[-_]"default"[-_]"prec" return PERCENT_NO_DEFAULT_PREC;
"%no"[-_]"lines" return PERCENT_NO_LINES;
"%nonassoc" return PERCENT_NONASSOC;
+ "%nondeterministic-parser" return PERCENT_NONDETERMINISTIC_PARSER;
"%nterm" return PERCENT_NTERM;
"%output" return PERCENT_OUTPUT;
"%parse-param" token_type = PERCENT_PARSE_PARAM; BEGIN SC_PRE_CODE;
"|" rule_length = 0; return PIPE;
";" return SEMICOLON;
- "," {
- warn_at (*loc, _("stray `,' treated as white space"));
- }
-
{id} {
val->symbol = symbol_get (yytext, *loc);
id_loc = *loc;
}
{int} {
- unsigned long num;
- set_errno (0);
- num = strtoul (yytext, 0, 10);
- if (INT_MAX < num || get_errno ())
- {
- complain_at (*loc, _("integer out of range: %s"), quote (yytext));
- num = INT_MAX;
- }
- val->integer = num;
+ val->integer = scan_integer (yytext, 10, *loc);
+ return INT;
+ }
+ 0[xX][0-9abcdefABCDEF]+ {
+ val->integer = scan_integer (yytext, 16, *loc);
return INT;
}
"%%" {
static int percent_percent_count;
if (++percent_percent_count == 2)
- {
- code_start = loc->start;
- BEGIN SC_EPILOGUE;
- }
+ BEGIN SC_EPILOGUE;
return PERCENT_PERCENT;
}
. {
complain_at (*loc, _("invalid character: %s"), quote (yytext));
}
+
+ <<EOF>> {
+ loc->start = loc->end = scanner_cursor;
+ yyterminate ();
+ }
}
{
"*/" BEGIN context_state;
.|\n ;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
<SC_COMMENT>
{
"*"{splice}"/" STRING_GROW; BEGIN context_state;
- <<EOF>> unexpected_end_of_file (token_start, "*/");
+ <<EOF>> unexpected_eof (token_start, "*/"); BEGIN context_state;
}
}
- /*----------------------------------------------------------------.
- | Scanning a C string, including its escapes. The initial `"' is |
- | already eaten. |
- `----------------------------------------------------------------*/
+ /*------------------------------------------------.
+ | Scanning a Bison string, including its escapes. |
+ | The initial quote is already eaten. |
+ `------------------------------------------------*/
<SC_ESCAPED_STRING>
{
BEGIN INITIAL;
return STRING;
}
-
- .|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ \n unexpected_newline (token_start, "\""); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
- /*---------------------------------------------------------------.
- | Scanning a C character, decoding its escapes. The initial "'" |
- | is already eaten. |
- `---------------------------------------------------------------*/
+ /*----------------------------------------------------------.
+ | Scanning a Bison character literal, decoding its escapes. |
+ | The initial quote is already eaten. |
+ `----------------------------------------------------------*/
<SC_ESCAPED_CHARACTER>
{
BEGIN INITIAL;
return ID;
}
+ \n unexpected_newline (token_start, "'"); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
+}
- .|\n STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+<SC_ESCAPED_CHARACTER,SC_ESCAPED_STRING>
+{
+ \0 complain_at (*loc, _("invalid null character"));
}
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
\\[0-7]{1,3} {
- unsigned long c = strtoul (yytext + 1, 0, 8);
+ unsigned long int c = strtoul (yytext + 1, 0, 8);
if (UCHAR_MAX < c)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
\\x[0-9abcdefABCDEF]+ {
- unsigned long c;
+ unsigned long int c;
set_errno (0);
c = strtoul (yytext + 2, 0, 16);
if (UCHAR_MAX < c || get_errno ())
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
int c = convert_ucn_to_byte (yytext);
if (c < 0)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
+ else if (! c)
+ complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
}
}
+ /*--------------------------------------------.
+ | Scanning user-code characters and strings. |
+ `--------------------------------------------*/
- /*----------------------------------------------------------.
- | Scanning a C character without decoding its escapes. The |
- | initial "'" is already eaten. |
- `----------------------------------------------------------*/
+<SC_CHARACTER,SC_STRING>
+{
+ {splice}|\\{splice}[^\n$@\[\]] STRING_GROW;
+}
<SC_CHARACTER>
{
- "'" STRING_GROW; BEGIN context_state;
- \\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "'");
+ "'" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "'"); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN context_state;
}
-
- /*----------------------------------------------------------------.
- | Scanning a C string, without decoding its escapes. The initial |
- | `"' is already eaten. |
- `----------------------------------------------------------------*/
-
<SC_STRING>
{
- "\"" STRING_GROW; BEGIN context_state;
- \\{splice}[^$@\[\]] STRING_GROW;
- <<EOF>> unexpected_end_of_file (token_start, "\"");
+ "\"" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "\""); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN context_state;
}
return token_type;
}
}
+
+ <<EOF>> unexpected_eof (scanner_cursor, "{}"); BEGIN INITIAL;
}
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)
+ if (outer_brace && token_type == BRACED_CODE && ! yacc_flag)
obstack_1grow (&obstack_for_string, ';');
obstack_1grow (&obstack_for_string, '}');
"$"("<"{tag}">")?(-?[0-9]+|"$") handle_dollar (token_type, yytext, *loc);
"@"(-?[0-9]+|"$") handle_at (token_type, yytext, *loc);
- <<EOF>> unexpected_end_of_file (code_start, "}");
+ <<EOF>> unexpected_eof (code_start, "}"); BEGIN INITIAL;
}
return PROLOGUE;
}
- <<EOF>> unexpected_end_of_file (code_start, "%}");
+ <<EOF>> unexpected_eof (code_start, "%}"); BEGIN INITIAL;
}
}
- /*----------------------------------------------------------------.
- | By default, grow the string obstack with the input, escaping M4 |
- | quoting characters. |
- `----------------------------------------------------------------*/
+ /*-----------------------------------------.
+ | Escape M4 quoting characters in C code. |
+ `-----------------------------------------*/
<SC_COMMENT,SC_LINE_COMMENT,SC_STRING,SC_CHARACTER,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>
{
\@ obstack_sgrow (&obstack_for_string, "@@");
\[ obstack_sgrow (&obstack_for_string, "@{");
\] obstack_sgrow (&obstack_for_string, "@}");
- .|\n STRING_GROW;
}
+ /*-----------------------------------------------------.
+ | By default, grow the string obstack with the input. |
+ `-----------------------------------------------------*/
+
+<SC_COMMENT,SC_LINE_COMMENT,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE,SC_STRING,SC_CHARACTER,SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>. |
+<SC_COMMENT,SC_LINE_COMMENT,SC_BRACED_CODE,SC_PROLOGUE,SC_EPILOGUE>\n STRING_GROW;
+
%%
+/* Keeps track of the maximum number of semantic values to the left of
+ a handle (those referenced by $0, $-1, etc.) are required by the
+ semantic actions of this grammar. */
+int max_left_semantic_context = 0;
+
/* Set *LOC and adjust scanner cursor to account for token TOKEN of
size SIZE. */
static size_t
no_cr_read (FILE *fp, char *buf, size_t size)
{
- size_t s = fread (buf, 1, size, fp);
- if (s)
+ size_t bytes_read = fread (buf, 1, size, fp);
+ if (bytes_read)
{
- char *w = memchr (buf, '\r', s);
+ char *w = memchr (buf, '\r', bytes_read);
if (w)
{
char const *r = ++w;
- char const *lim = buf + s;
+ char const *lim = buf + bytes_read;
for (;;)
{
}
}
- return s;
+ return bytes_read;
}
}
else
{
- long num;
+ long int num;
set_errno (0);
num = strtol (cp, 0, 10);
if (INT_MIN <= num && num <= rule_length && ! get_errno ())
{
int n = num;
+ if (1-n > max_left_semantic_context)
+ max_left_semantic_context = 1-n;
if (!type_name && n > 0)
type_name = symbol_list_n_type_name_get (current_rule, loc, n);
if (!type_name && typed)
}
-/*-----------------------------------------------------------------.
-| Dispatch onto handle_action_dollar, or handle_destructor_dollar, |
-| depending upon TOKEN_TYPE. |
-`-----------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Map `$?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
+| (are we in an action?). |
+`----------------------------------------------------------------*/
static void
handle_dollar (int token_type, char *text, location loc)
break;
case PERCENT_DESTRUCTOR:
+ case PERCENT_INITIAL_ACTION:
case PERCENT_PRINTER:
if (text[1] == '$')
{
handle_action_at (char *text, location loc)
{
char *cp = text + 1;
- locations_flag = 1;
+ locations_flag = true;
if (! current_rule)
return false;
obstack_sgrow (&obstack_for_string, "]b4_lhs_location[");
else
{
- long num;
+ long int num;
set_errno (0);
num = strtol (cp, 0, 10);
}
-/*-------------------------------------------------------------------.
-| Dispatch onto handle_action_at, or handle_destructor_at, depending |
-| upon CODE_KIND. |
-`-------------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Map `@?' onto the proper M4 symbol, depending on its TOKEN_TYPE |
+| (are we in an action?). |
+`----------------------------------------------------------------*/
static void
handle_at (int token_type, char *text, location loc)
handle_action_at (text, loc);
return;
+ case PERCENT_INITIAL_ACTION:
case PERCENT_DESTRUCTOR:
case PERCENT_PRINTER:
if (text[1] == '$')
}
+/*------------------------------------------------------.
+| Scan NUMBER for a base-BASE integer at location LOC. |
+`------------------------------------------------------*/
+
+static unsigned long int
+scan_integer (char const *number, int base, location loc)
+{
+ unsigned long int num;
+ set_errno (0);
+ num = strtoul (number, 0, base);
+ if (INT_MAX < num || get_errno ())
+ {
+ complain_at (loc, _("integer out of range: %s"), quote (number));
+ num = INT_MAX;
+ }
+ return num;
+}
+
+
/*------------------------------------------------------------------.
| Convert universal character name UCN to a single-byte character, |
| and return that character. Return -1 if UCN does not correspond |
static int
convert_ucn_to_byte (char const *ucn)
{
- unsigned long code = strtoul (ucn + 2, 0, 16);
+ unsigned long int code = strtoul (ucn + 2, 0, 16);
/* FIXME: Currently we assume Unicode-compatible unibyte characters
on ASCII hosts (i.e., Latin-1 on hosts with 8-bit bytes). On
const char *file = NULL;
file = strchr (args, '"') + 1;
*strchr (file, '"') = 0;
- scanner_cursor.file = current_file = xstrdup (file);
+ scanner_cursor.file = current_file = uniqstr_new (file);
scanner_cursor.line = lineno;
scanner_cursor.column = 1;
}
+/*----------------------------------------------------------------.
+| For a token or comment starting at START, report message MSGID, |
+| which should say that an end marker was found before |
+| the expected TOKEN_END. |
+`----------------------------------------------------------------*/
+
+static void
+unexpected_end (boundary start, char const *msgid, char const *token_end)
+{
+ location loc;
+ loc.start = start;
+ loc.end = scanner_cursor;
+ complain_at (loc, _(msgid), token_end);
+}
+
+
/*------------------------------------------------------------------------.
| Report an unexpected EOF in a token or comment starting at START. |
| An end of file was encountered and the expected TOKEN_END was missing. |
-| After reporting the problem, pretend that TOKEN_END was found. |
`------------------------------------------------------------------------*/
static void
-unexpected_end_of_file (boundary start, char const *token_end)
+unexpected_eof (boundary start, char const *token_end)
{
- size_t i = strlen (token_end);
+ unexpected_end (start, N_("missing `%s' at end of file"), token_end);
+}
- location loc;
- loc.start = start;
- loc.end = scanner_cursor;
- complain_at (loc, _("missing `%s' at end of file"), token_end);
- /* Adjust scanner cursor so that any later message does not count
- the characters about to be inserted. */
- scanner_cursor.column -= i;
+/*----------------------------------------.
+| Likewise, but for unexpected newlines. |
+`----------------------------------------*/
- while (i != 0)
- unput (token_end[--i]);
+static void
+unexpected_newline (boundary start, char const *token_end)
+{
+ unexpected_end (start, N_("missing `%s' at end of line"), token_end);
}
projects / bison.git / blobdiff