/* Bison Grammar Scanner -*- C -*-
- Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301 USA
*/
%option debug nodefault nounput noyywrap never-interactive
%option prefix="gram_" outfile="lex.yy.c"
%{
+/* Work around a bug in flex 2.5.31. See Debian bug 333231
+ <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
+#undef gram_wrap
+#define gram_wrap() 1
+
#include "system.h"
#include <mbswidth.h>
-#include <get-errno.h>
#include <quote.h>
#include "complain.h"
#include "files.h"
#include "getargs.h"
#include "gram.h"
+#include "quotearg.h"
#include "reader.h"
#include "uniqstr.h"
} \
while (0)
+/* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used. */
+int gram_get_lineno (void);
+FILE *gram_get_in (void);
+FILE *gram_get_out (void);
+int gram_get_leng (void);
+char *gram_get_text (void);
+void gram_set_lineno (int);
+void gram_set_in (FILE *);
+void gram_set_out (FILE *);
+int gram_get_debug (void);
+void gram_set_debug (int);
+int gram_lex_destroy (void);
+
/* Location of scanner cursor. */
boundary scanner_cursor;
static struct obstack obstack_for_string;
/* A string representing the most recently saved token. */
-static char *last_string;
+char *last_string;
+/* The location of the most recently saved token, if it was a
+ BRACED_CODE token; otherwise, this has an unspecified value. */
+location last_braced_code_loc;
#define STRING_GROW \
obstack_grow (&obstack_for_string, yytext, yyleng)
Outside of well-formed rules, RULE_LENGTH has an undefined value. */
static int rule_length;
+static void rule_length_overflow (location) __attribute__ ((__noreturn__));
+
+/* Increment the rule length by one, checking for overflow. */
+static inline void
+increment_rule_length (location loc)
+{
+ rule_length++;
+
+ /* Don't allow rule_length == INT_MAX, since that might cause
+ confusion with strtol if INT_MAX == LONG_MAX. */
+ if (rule_length == INT_MAX)
+ rule_length_overflow (loc);
+}
+
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 void handle_syncline (char *, location);
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_eof (boundary, char const *);
+static void unexpected_newline (boundary, char const *);
%}
%x SC_COMMENT SC_LINE_COMMENT SC_YACC_COMMENT
<INITIAL,SC_AFTER_IDENTIFIER,SC_PRE_CODE>
{
- [ \f\n\t\v] ;
+ /* Comments and white space. */
"," warn_at (*loc, _("stray `,' treated as white space"));
-
- /* Comments. */
+ [ \f\n\t\v] |
"//".* ;
"/*" {
token_start = loc->start;
/* #line directives are not documented, and may be withdrawn or
modified in future versions of Bison. */
^"#line "{int}" \"".*"\"\n" {
- handle_syncline (yytext + sizeof "#line " - 1);
+ handle_syncline (yytext + sizeof "#line " - 1, *loc);
}
}
"%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;
"%prec" rule_length--; return PERCENT_PREC;
"%printer" token_type = PERCENT_PRINTER; BEGIN SC_PRE_CODE;
"%pure"[-_]"parser" return PERCENT_PURE_PARSER;
+ "%require" return PERCENT_REQUIRE;
"%right" return PERCENT_RIGHT;
"%skeleton" return PERCENT_SKELETON;
"%start" return PERCENT_START;
{id} {
val->symbol = symbol_get (yytext, *loc);
id_loc = *loc;
- rule_length++;
+ increment_rule_length (*loc);
BEGIN SC_AFTER_IDENTIFIER;
}
"'" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
/* Strings. */
- "\"" STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_STRING;
+ "\"" token_start = loc->start; BEGIN SC_ESCAPED_STRING;
/* Prologue. */
"%{" code_start = loc->start; BEGIN SC_PROLOGUE;
/* Code in between braces. */
"{" {
+ if (current_rule && current_rule->action)
+ grammar_midrule_action ();
STRING_GROW;
token_type = BRACED_CODE;
braces_level = 0;
}
- /*----------------------------------------------------------------.
- | 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>
{
"\"" {
- STRING_GROW;
STRING_FINISH;
loc->start = token_start;
val->chars = last_string;
- rule_length++;
+ increment_rule_length (*loc);
BEGIN INITIAL;
return STRING;
}
-
- \0 complain_at (*loc, _("invalid null character"));
- .|\n STRING_GROW;
- <<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
+ \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>
{
STRING_GROW;
STRING_FINISH;
loc->start = token_start;
- val->symbol = symbol_get (last_string, *loc);
- symbol_class_set (val->symbol, token_sym, *loc);
+ val->symbol = symbol_get (quotearg_style (escape_quoting_style,
+ last_string),
+ *loc);
+ symbol_class_set (val->symbol, token_sym, *loc, false);
last_string_1 = last_string[1];
symbol_user_token_number_set (val->symbol, last_string_1, *loc);
STRING_FREE;
- rule_length++;
+ increment_rule_length (*loc);
BEGIN INITIAL;
return ID;
}
+ \n unexpected_newline (token_start, "'"); BEGIN INITIAL;
+ <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
+}
+<SC_ESCAPED_CHARACTER,SC_ESCAPED_STRING>
+{
\0 complain_at (*loc, _("invalid null character"));
- .|\n STRING_GROW;
- <<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
}
<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>
{
\\[0-7]{1,3} {
- unsigned long int c = strtoul (yytext + 1, 0, 8);
+ unsigned long int c = strtoul (yytext + 1, NULL, 8);
if (UCHAR_MAX < c)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
- else if (! c)
+ else if (! c)
complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
\\x[0-9abcdefABCDEF]+ {
- unsigned long int c;
- set_errno (0);
- c = strtoul (yytext + 2, 0, 16);
- if (UCHAR_MAX < c || get_errno ())
+ verify (UCHAR_MAX < ULONG_MAX);
+ unsigned long int c = strtoul (yytext + 2, NULL, 16);
+ 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));
}
}
+ /*--------------------------------------------.
+ | 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_eof (token_start, "'"); BEGIN context_state;
+ "'" 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_eof (token_start, "\"");
- BEGIN context_state;
- }
+ "\"" STRING_GROW; BEGIN context_state;
+ \n unexpected_newline (token_start, "\""); BEGIN context_state;
+ <<EOF>> unexpected_eof (token_start, "\""); BEGIN context_state;
}
}
else
{
- complain_at (*loc, _("missing `{' in `%s'"),
+ complain_at (*loc, _("missing `{' in %s"),
token_name (token_type));
obstack_sgrow (&obstack_for_string, "{}");
STRING_FINISH;
if (outer_brace)
{
STRING_FINISH;
- rule_length++;
loc->start = code_start;
val->chars = last_string;
+ increment_rule_length (*loc);
+ last_braced_code_loc = *loc;
BEGIN INITIAL;
return token_type;
}
"$"("<"{tag}">")?(-?[0-9]+|"$") handle_dollar (token_type, yytext, *loc);
"@"(-?[0-9]+|"$") handle_at (token_type, yytext, *loc);
+ "$" {
+ warn_at (*loc, _("stray `$'"));
+ obstack_sgrow (&obstack_for_string, "$][");
+ }
+ "@" {
+ warn_at (*loc, _("stray `@'"));
+ obstack_sgrow (&obstack_for_string, "@@");
+ }
+
<<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
semantic actions of this grammar. */
int max_left_semantic_context = 0;
+/* If BUF is null, add BUFSIZE (which in this case must be less than
+ INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to
+ COLUMN. If an overflow occurs, or might occur but is undetectable,
+ return INT_MAX. Assume COLUMN is nonnegative. */
+
+static inline int
+add_column_width (int column, char const *buf, size_t bufsize)
+{
+ size_t width;
+ unsigned int remaining_columns = INT_MAX - column;
+
+ if (buf)
+ {
+ if (INT_MAX / 2 <= bufsize)
+ return INT_MAX;
+ width = mbsnwidth (buf, bufsize, 0);
+ }
+ else
+ width = bufsize;
+
+ return width <= remaining_columns ? column + width : INT_MAX;
+}
+
/* Set *LOC and adjust scanner cursor to account for token TOKEN of
size SIZE. */
switch (*p)
{
case '\n':
- line++;
+ line += line < INT_MAX;
column = 1;
p0 = p + 1;
break;
case '\t':
- column += mbsnwidth (p0, p - p0, 0);
- column += 8 - ((column - 1) & 7);
+ column = add_column_width (column, p0, p - p0);
+ column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
p0 = p + 1;
break;
+
+ default:
+ break;
}
scanner_cursor.line = line;
- scanner_cursor.column = column + mbsnwidth (p0, p - p0, 0);
+ scanner_cursor.column = column = add_column_width (column, p0, p - p0);
loc->end = scanner_cursor;
+
+ if (line == INT_MAX && loc->start.line != INT_MAX)
+ warn_at (*loc, _("line number overflow"));
+ if (column == INT_MAX && loc->start.column != INT_MAX)
+ warn_at (*loc, _("column number overflow"));
}
type_name = "";
obstack_fgrow1 (&obstack_for_string,
"]b4_lhs_value([%s])[", type_name);
+ current_rule->used = true;
}
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 + rule_length <= num && num <= rule_length)
{
int n = num;
- if (1-n > max_left_semantic_context)
- max_left_semantic_context = 1-n;
- if (!type_name && n > 0)
+ 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 (current_rule, loc, n);
if (!type_name && typed)
complain_at (loc, _("$%d of `%s' has no declared type"),
if (!type_name)
type_name = "";
obstack_fgrow3 (&obstack_for_string,
- "]b4_rhs_value([%d], [%d], [%s])[",
+ "]b4_rhs_value(%d, %d, [%s])[",
rule_length, n, type_name);
+ symbol_list_n_used_set (current_rule, n, true);
}
else
complain_at (loc, _("integer out of range: %s"), quote (text));
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 + rule_length <= num && num <= rule_length)
{
int n = num;
- obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location([%d], [%d])[",
+ obstack_fgrow2 (&obstack_for_string, "]b4_rhs_location(%d, %d)[",
rule_length, n);
}
else
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 ())
+ verify (INT_MAX < ULONG_MAX);
+ unsigned long int num = strtoul (number, NULL, base);
+
+ if (INT_MAX < num)
{
complain_at (loc, _("integer out of range: %s"), quote (number));
num = INT_MAX;
}
+
return num;
}
static int
convert_ucn_to_byte (char const *ucn)
{
- unsigned long int code = strtoul (ucn + 2, 0, 16);
+ verify (UCHAR_MAX <= INT_MAX);
+ unsigned long int code = strtoul (ucn + 2, NULL, 16);
/* FIXME: Currently we assume Unicode-compatible unibyte characters
on ASCII hosts (i.e., Latin-1 on hosts with 8-bit bytes). On
`----------------------------------------------------------------*/
static void
-handle_syncline (char *args)
+handle_syncline (char *args, location loc)
{
- int lineno = strtol (args, &args, 10);
- const char *file = NULL;
- file = strchr (args, '"') + 1;
- *strchr (file, '"') = 0;
- scanner_cursor.file = current_file = xstrdup (file);
+ char *after_num;
+ unsigned long int lineno = strtoul (args, &after_num, 10);
+ char *file = strchr (after_num, '"') + 1;
+ *strchr (file, '"') = '\0';
+ if (INT_MAX <= lineno)
+ {
+ warn_at (loc, _("line number overflow"));
+ lineno = INT_MAX;
+ }
+ scanner_cursor.file = current_file = uniqstr_new (file);
scanner_cursor.line = lineno;
scanner_cursor.column = 1;
}
+/*---------------------------------.
+| Report a rule that is too long. |
+`---------------------------------*/
+
+static void
+rule_length_overflow (location loc)
+{
+ fatal_at (loc, _("rule is too long"));
+}
+
+
+/*----------------------------------------------------------------.
+| 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. |
static void
unexpected_eof (boundary start, char const *token_end)
{
- location loc;
- loc.start = start;
- loc.end = scanner_cursor;
- complain_at (loc, _("missing `%s' at end of file"), token_end);
+ unexpected_end (start, N_("missing `%s' at end of file"), token_end);
+}
+
+
+/*----------------------------------------.
+| Likewise, but for unexpected newlines. |
+`----------------------------------------*/
+
+static void
+unexpected_newline (boundary start, char const *token_end)
+{
+ unexpected_end (start, N_("missing `%s' at end of line"), token_end);
}
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