1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
30 format_asterisk
= {0, NULL
, NULL
, -1, ST_LABEL_FORMAT
, ST_LABEL_FORMAT
, NULL
,
35 const char *name
, *spec
;
41 tag_file
= { "FILE", " file = %e", BT_CHARACTER
},
42 tag_status
= { "STATUS", " status = %e", BT_CHARACTER
},
43 tag_e_access
= {"ACCESS", " access = %e", BT_CHARACTER
},
44 tag_e_form
= {"FORM", " form = %e", BT_CHARACTER
},
45 tag_e_recl
= {"RECL", " recl = %e", BT_INTEGER
},
46 tag_e_blank
= {"BLANK", " blank = %e", BT_CHARACTER
},
47 tag_e_position
= {"POSITION", " position = %e", BT_CHARACTER
},
48 tag_e_action
= {"ACTION", " action = %e", BT_CHARACTER
},
49 tag_e_delim
= {"DELIM", " delim = %e", BT_CHARACTER
},
50 tag_e_pad
= {"PAD", " pad = %e", BT_CHARACTER
},
51 tag_unit
= {"UNIT", " unit = %e", BT_INTEGER
},
52 tag_advance
= {"ADVANCE", " advance = %e", BT_CHARACTER
},
53 tag_rec
= {"REC", " rec = %e", BT_INTEGER
},
54 tag_spos
= {"POSITION", " pos = %e", BT_INTEGER
},
55 tag_format
= {"FORMAT", NULL
, BT_CHARACTER
},
56 tag_iomsg
= {"IOMSG", " iomsg = %e", BT_CHARACTER
},
57 tag_iostat
= {"IOSTAT", " iostat = %v", BT_INTEGER
},
58 tag_size
= {"SIZE", " size = %v", BT_INTEGER
},
59 tag_exist
= {"EXIST", " exist = %v", BT_LOGICAL
},
60 tag_opened
= {"OPENED", " opened = %v", BT_LOGICAL
},
61 tag_named
= {"NAMED", " named = %v", BT_LOGICAL
},
62 tag_name
= {"NAME", " name = %v", BT_CHARACTER
},
63 tag_number
= {"NUMBER", " number = %v", BT_INTEGER
},
64 tag_s_access
= {"ACCESS", " access = %v", BT_CHARACTER
},
65 tag_sequential
= {"SEQUENTIAL", " sequential = %v", BT_CHARACTER
},
66 tag_direct
= {"DIRECT", " direct = %v", BT_CHARACTER
},
67 tag_s_form
= {"FORM", " form = %v", BT_CHARACTER
},
68 tag_formatted
= {"FORMATTED", " formatted = %v", BT_CHARACTER
},
69 tag_unformatted
= {"UNFORMATTED", " unformatted = %v", BT_CHARACTER
},
70 tag_s_recl
= {"RECL", " recl = %v", BT_INTEGER
},
71 tag_nextrec
= {"NEXTREC", " nextrec = %v", BT_INTEGER
},
72 tag_s_blank
= {"BLANK", " blank = %v", BT_CHARACTER
},
73 tag_s_position
= {"POSITION", " position = %v", BT_CHARACTER
},
74 tag_s_action
= {"ACTION", " action = %v", BT_CHARACTER
},
75 tag_read
= {"READ", " read = %v", BT_CHARACTER
},
76 tag_write
= {"WRITE", " write = %v", BT_CHARACTER
},
77 tag_readwrite
= {"READWRITE", " readwrite = %v", BT_CHARACTER
},
78 tag_s_delim
= {"DELIM", " delim = %v", BT_CHARACTER
},
79 tag_s_pad
= {"PAD", " pad = %v", BT_CHARACTER
},
80 tag_iolength
= {"IOLENGTH", " iolength = %v", BT_INTEGER
},
81 tag_convert
= {"CONVERT", " convert = %e", BT_CHARACTER
},
82 tag_strm_out
= {"POS", " pos = %v", BT_INTEGER
},
83 tag_err
= {"ERR", " err = %l", BT_UNKNOWN
},
84 tag_end
= {"END", " end = %l", BT_UNKNOWN
},
85 tag_eor
= {"EOR", " eor = %l", BT_UNKNOWN
};
87 static gfc_dt
*current_dt
;
89 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
92 /**************** Fortran 95 FORMAT parser *****************/
94 /* FORMAT tokens returned by format_lex(). */
97 FMT_NONE
, FMT_UNKNOWN
, FMT_SIGNED_INT
, FMT_ZERO
, FMT_POSINT
, FMT_PERIOD
,
98 FMT_COMMA
, FMT_COLON
, FMT_SLASH
, FMT_DOLLAR
, FMT_POS
, FMT_LPAREN
,
99 FMT_RPAREN
, FMT_X
, FMT_SIGN
, FMT_BLANK
, FMT_CHAR
, FMT_P
, FMT_IBOZ
, FMT_F
,
100 FMT_E
, FMT_EXT
, FMT_G
, FMT_L
, FMT_A
, FMT_D
, FMT_H
, FMT_END
, FMT_ERROR
104 /* Local variables for checking format strings. The saved_token is
105 used to back up by a single format token during the parsing
107 static char *format_string
;
108 static int format_length
, use_last_char
;
110 static format_token saved_token
;
113 { MODE_STRING
, MODE_FORMAT
, MODE_COPY
}
117 /* Return the next character in the format string. */
120 next_char (int in_string
)
132 if (mode
== MODE_STRING
)
133 c
= *format_string
++;
136 c
= gfc_next_char_literal (in_string
);
141 if (gfc_option
.flag_backslash
&& c
== '\\')
144 locus old_locus
= gfc_current_locus
;
146 /* Use a temp variable to avoid side effects from gfc_match_special_char
147 since it uses an int * for its argument. */
150 if (gfc_match_special_char (&tmp
) == MATCH_NO
)
151 gfc_current_locus
= old_locus
;
155 if (!(gfc_option
.allow_std
& GFC_STD_GNU
) && !inhibit_warnings
)
156 gfc_warning ("Extension: backslash character at %C");
159 if (mode
== MODE_COPY
)
160 *format_string
++ = c
;
167 /* Back up one character position. Only works once. */
175 /* Eat up the spaces and return a character. */
178 next_char_not_space (bool *error
)
186 if (gfc_option
.allow_std
& GFC_STD_GNU
)
187 gfc_warning ("Extension: Tab character in format at %C");
190 gfc_error ("Extension: Tab character in format at %C");
196 while (gfc_is_whitespace (c
));
200 static int value
= 0;
202 /* Simple lexical analyzer for getting the next token in a FORMAT
214 if (saved_token
!= FMT_NONE
)
217 saved_token
= FMT_NONE
;
221 c
= next_char_not_space (&error
);
229 c
= next_char_not_space (&error
);
240 c
= next_char_not_space (&error
);
242 value
= 10 * value
+ c
- '0';
251 token
= FMT_SIGNED_INT
;
270 c
= next_char_not_space (&error
);
273 value
= 10 * value
+ c
- '0';
281 token
= zflag
? FMT_ZERO
: FMT_POSINT
;
305 c
= next_char_not_space (&error
);
306 if (c
!= 'L' && c
!= 'R')
325 c
= next_char_not_space (&error
);
326 if (c
!= 'P' && c
!= 'S')
333 c
= next_char_not_space (&error
);
334 if (c
== 'N' || c
== 'Z')
395 c
= next_char_not_space (&error
);
396 if (c
== 'N' || c
== 'S')
442 /* Check a format statement. The format string, either from a FORMAT
443 statement or a constant in an I/O statement has already been parsed
444 by itself, and we are checking it for validity. The dual origin
445 means that the warning message is a little less than great. */
448 check_format (bool is_input
)
450 const char *posint_required
= _("Positive width required");
451 const char *nonneg_required
= _("Nonnegative width required");
452 const char *unexpected_element
= _("Unexpected element");
453 const char *unexpected_end
= _("Unexpected end of format string");
462 saved_token
= FMT_NONE
;
472 error
= _("Missing leading left parenthesis");
480 goto finished
; /* Empty format is legal */
484 /* In this state, the next thing has to be a format item. */
513 /* Signed integer can only precede a P format. */
519 error
= _("Expected P edit descriptor");
526 /* P requires a prior number. */
527 error
= _("P descriptor requires leading scale factor");
531 /* X requires a prior number if we're being pedantic. */
532 if (gfc_notify_std (GFC_STD_GNU
, "Extension: X descriptor "
533 "requires leading space count at %C")
543 goto extension_optional_comma
;
554 if (gfc_notify_std (GFC_STD_GNU
, "Extension: $ descriptor at %C")
557 if (t
!= FMT_RPAREN
|| level
> 0)
559 gfc_warning ("$ should be the last specifier in format at %C");
560 goto optional_comma_1
;
578 error
= unexpected_end
;
582 error
= unexpected_element
;
587 /* In this state, t must currently be a data descriptor.
588 Deal with things that can/must follow the descriptor. */
604 error
= _("Repeat count cannot follow P descriptor");
621 switch (gfc_notification_std (GFC_STD_GNU
))
624 gfc_warning ("Extension: Missing positive width after L "
630 error
= posint_required
;
659 error
= posint_required
;
668 /* Warn if -std=legacy, otherwise error. */
669 if (gfc_option
.warn_std
!= 0)
670 gfc_error_now ("Period required in format specifier at %C");
672 gfc_warning ("Period required in format specifier at %C");
680 if (u
!= FMT_ZERO
&& u
!= FMT_POSINT
)
682 error
= nonneg_required
;
689 /* Look for optional exponent. */
704 error
= _("Positive exponent width required");
715 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
717 error
= nonneg_required
;
720 else if (is_input
&& t
== FMT_ZERO
)
722 error
= posint_required
;
731 /* Warn if -std=legacy, otherwise error. */
732 if (gfc_option
.warn_std
!= 0)
733 gfc_error_now ("Period required in format specifier at %C");
735 gfc_warning ("Period required in format specifier at %C");
743 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
745 error
= nonneg_required
;
752 if (!(gfc_option
.allow_std
& GFC_STD_GNU
) && !inhibit_warnings
)
753 gfc_warning ("The H format specifier at %C is"
754 " a Fortran 95 deleted feature");
756 if(mode
== MODE_STRING
)
758 format_string
+= value
;
759 format_length
-= value
;
775 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
777 error
= nonneg_required
;
780 else if (is_input
&& t
== FMT_ZERO
)
782 error
= posint_required
;
798 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
800 error
= nonneg_required
;
808 error
= unexpected_element
;
813 /* Between a descriptor and what comes next. */
834 error
= unexpected_end
;
838 if (gfc_notify_std (GFC_STD_GNU
, "Extension: Missing comma at %C")
845 /* Optional comma is a weird between state where we've just finished
846 reading a colon, slash, dollar or P descriptor. */
863 /* Assume that we have another format item. */
870 extension_optional_comma
:
871 /* As a GNU extension, permit a missing comma after a string literal. */
891 error
= unexpected_end
;
895 if (gfc_notify_std (GFC_STD_GNU
, "Extension: Missing comma at %C")
905 gfc_error ("%s in format string at %C", error
);
907 /* TODO: More elaborate measures are needed to show where a problem
908 is within a format string that has been calculated. */
916 /* Given an expression node that is a constant string, see if it looks
917 like a format string. */
920 check_format_string (gfc_expr
*e
, bool is_input
)
923 format_string
= e
->value
.character
.string
;
924 return check_format (is_input
);
928 /************ Fortran 95 I/O statement matchers *************/
930 /* Match a FORMAT statement. This amounts to actually parsing the
931 format descriptors in order to correctly locate the end of the
935 gfc_match_format (void)
940 if (gfc_current_ns
->proc_name
941 && gfc_current_ns
->proc_name
->attr
.flavor
== FL_MODULE
)
943 gfc_error ("Format statement in module main block at %C");
947 if (gfc_statement_label
== NULL
)
949 gfc_error ("Missing format label at %C");
952 gfc_gobble_whitespace ();
957 start
= gfc_current_locus
;
959 if (check_format (false) == FAILURE
)
962 if (gfc_match_eos () != MATCH_YES
)
964 gfc_syntax_error (ST_FORMAT
);
968 /* The label doesn't get created until after the statement is done
969 being matched, so we have to leave the string for later. */
971 gfc_current_locus
= start
; /* Back to the beginning */
974 new_st
.op
= EXEC_NOP
;
977 e
->expr_type
= EXPR_CONSTANT
;
978 e
->ts
.type
= BT_CHARACTER
;
979 e
->ts
.kind
= gfc_default_character_kind
;
981 e
->value
.character
.string
= format_string
= gfc_getmem (format_length
+ 1);
982 e
->value
.character
.length
= format_length
;
983 gfc_statement_label
->format
= e
;
986 check_format (false); /* Guaranteed to succeed */
987 gfc_match_eos (); /* Guaranteed to succeed */
993 /* Match an expression I/O tag of some sort. */
996 match_etag (const io_tag
*tag
, gfc_expr
**v
)
1001 m
= gfc_match (tag
->spec
, &result
);
1007 gfc_error ("Duplicate %s specification at %C", tag
->name
);
1008 gfc_free_expr (result
);
1017 /* Match a variable I/O tag of some sort. */
1020 match_vtag (const io_tag
*tag
, gfc_expr
**v
)
1025 m
= gfc_match (tag
->spec
, &result
);
1031 gfc_error ("Duplicate %s specification at %C", tag
->name
);
1032 gfc_free_expr (result
);
1036 if (result
->symtree
->n
.sym
->attr
.intent
== INTENT_IN
)
1038 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
1039 gfc_free_expr (result
);
1043 if (gfc_pure (NULL
) && gfc_impure_variable (result
->symtree
->n
.sym
))
1045 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
1046 gfc_free_expr (result
);
1055 /* Match I/O tags that cause variables to become redefined. */
1058 match_out_tag(const io_tag
*tag
, gfc_expr
**result
)
1062 m
= match_vtag(tag
, result
);
1064 gfc_check_do_variable((*result
)->symtree
);
1070 /* Match a label I/O tag. */
1073 match_ltag (const io_tag
*tag
, gfc_st_label
** label
)
1079 m
= gfc_match (tag
->spec
, label
);
1080 if (m
== MATCH_YES
&& old
!= 0)
1082 gfc_error ("Duplicate %s label specification at %C", tag
->name
);
1087 && gfc_reference_st_label (*label
, ST_LABEL_TARGET
) == FAILURE
)
1094 /* Do expression resolution and type-checking on an expression tag. */
1097 resolve_tag (const io_tag
*tag
, gfc_expr
*e
)
1102 if (gfc_resolve_expr (e
) == FAILURE
)
1105 if (e
->ts
.type
!= tag
->type
&& tag
!= &tag_format
)
1107 gfc_error ("%s tag at %L must be of type %s", tag
->name
,
1108 &e
->where
, gfc_basic_typename (tag
->type
));
1112 if (tag
== &tag_format
)
1114 if (e
->expr_type
== EXPR_CONSTANT
1115 && (e
->ts
.type
!= BT_CHARACTER
1116 || e
->ts
.kind
!= gfc_default_character_kind
))
1118 gfc_error ("Constant expression in FORMAT tag at %L must be "
1119 "of type default CHARACTER", &e
->where
);
1123 /* If e's rank is zero and e is not an element of an array, it should be
1124 of integer or character type. The integer variable should be
1126 if (e
->symtree
== NULL
|| e
->symtree
->n
.sym
->as
== NULL
1127 || e
->symtree
->n
.sym
->as
->rank
== 0)
1129 if (e
->ts
.type
!= BT_CHARACTER
&& e
->ts
.type
!= BT_INTEGER
)
1131 gfc_error ("%s tag at %L must be of type %s or %s", tag
->name
,
1132 &e
->where
, gfc_basic_typename (BT_CHARACTER
),
1133 gfc_basic_typename (BT_INTEGER
));
1136 else if (e
->ts
.type
== BT_INTEGER
&& e
->expr_type
== EXPR_VARIABLE
)
1138 if (gfc_notify_std (GFC_STD_F95_DEL
, "Deleted feature: ASSIGNED "
1139 "variable in FORMAT tag at %L", &e
->where
)
1142 if (e
->symtree
->n
.sym
->attr
.assign
!= 1)
1144 gfc_error ("Variable '%s' at %L has not been assigned a "
1145 "format label", e
->symtree
->n
.sym
->name
,
1150 else if (e
->ts
.type
== BT_INTEGER
)
1152 gfc_error ("scalar '%s' FORMAT tag at %L is not an ASSIGNED "
1153 "variable", gfc_basic_typename (e
->ts
.type
),
1162 /* if rank is nonzero, we allow the type to be character under
1163 GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
1164 assigned an Hollerith constant. */
1165 if (e
->ts
.type
== BT_CHARACTER
)
1167 if (gfc_notify_std (GFC_STD_GNU
, "Extension: Character array "
1168 "in FORMAT tag at %L", &e
->where
)
1174 if (gfc_notify_std (GFC_STD_LEGACY
, "Extension: Non-character "
1175 "in FORMAT tag at %L", &e
->where
)
1186 gfc_error ("%s tag at %L must be scalar", tag
->name
, &e
->where
);
1190 if (tag
== &tag_iomsg
)
1192 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: IOMSG tag at %L",
1193 &e
->where
) == FAILURE
)
1197 if (tag
== &tag_iostat
&& e
->ts
.kind
!= gfc_default_integer_kind
)
1199 if (gfc_notify_std (GFC_STD_GNU
, "Fortran 95 requires default "
1200 "INTEGER in IOSTAT tag at %L", &e
->where
)
1205 if (tag
== &tag_size
&& e
->ts
.kind
!= gfc_default_integer_kind
)
1207 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 95 requires default "
1208 "INTEGER in SIZE tag at %L", &e
->where
)
1213 if (tag
== &tag_convert
)
1215 if (gfc_notify_std (GFC_STD_GNU
, "Extension: CONVERT tag at %L",
1216 &e
->where
) == FAILURE
)
1220 if (tag
== &tag_iolength
&& e
->ts
.kind
!= gfc_default_integer_kind
)
1222 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 95 requires default "
1223 "INTEGER in IOLENGTH tag at %L", &e
->where
)
1233 /* Match a single tag of an OPEN statement. */
1236 match_open_element (gfc_open
*open
)
1240 m
= match_etag (&tag_unit
, &open
->unit
);
1243 m
= match_out_tag (&tag_iomsg
, &open
->iomsg
);
1246 m
= match_out_tag (&tag_iostat
, &open
->iostat
);
1249 m
= match_etag (&tag_file
, &open
->file
);
1252 m
= match_etag (&tag_status
, &open
->status
);
1255 m
= match_etag (&tag_e_access
, &open
->access
);
1258 m
= match_etag (&tag_e_form
, &open
->form
);
1261 m
= match_etag (&tag_e_recl
, &open
->recl
);
1264 m
= match_etag (&tag_e_blank
, &open
->blank
);
1267 m
= match_etag (&tag_e_position
, &open
->position
);
1270 m
= match_etag (&tag_e_action
, &open
->action
);
1273 m
= match_etag (&tag_e_delim
, &open
->delim
);
1276 m
= match_etag (&tag_e_pad
, &open
->pad
);
1279 m
= match_ltag (&tag_err
, &open
->err
);
1282 m
= match_etag (&tag_convert
, &open
->convert
);
1290 /* Free the gfc_open structure and all the expressions it contains. */
1293 gfc_free_open (gfc_open
*open
)
1298 gfc_free_expr (open
->unit
);
1299 gfc_free_expr (open
->iomsg
);
1300 gfc_free_expr (open
->iostat
);
1301 gfc_free_expr (open
->file
);
1302 gfc_free_expr (open
->status
);
1303 gfc_free_expr (open
->access
);
1304 gfc_free_expr (open
->form
);
1305 gfc_free_expr (open
->recl
);
1306 gfc_free_expr (open
->blank
);
1307 gfc_free_expr (open
->position
);
1308 gfc_free_expr (open
->action
);
1309 gfc_free_expr (open
->delim
);
1310 gfc_free_expr (open
->pad
);
1311 gfc_free_expr (open
->convert
);
1316 /* Resolve everything in a gfc_open structure. */
1319 gfc_resolve_open (gfc_open
*open
)
1322 RESOLVE_TAG (&tag_unit
, open
->unit
);
1323 RESOLVE_TAG (&tag_iomsg
, open
->iomsg
);
1324 RESOLVE_TAG (&tag_iostat
, open
->iostat
);
1325 RESOLVE_TAG (&tag_file
, open
->file
);
1326 RESOLVE_TAG (&tag_status
, open
->status
);
1327 RESOLVE_TAG (&tag_e_access
, open
->access
);
1328 RESOLVE_TAG (&tag_e_form
, open
->form
);
1329 RESOLVE_TAG (&tag_e_recl
, open
->recl
);
1330 RESOLVE_TAG (&tag_e_blank
, open
->blank
);
1331 RESOLVE_TAG (&tag_e_position
, open
->position
);
1332 RESOLVE_TAG (&tag_e_action
, open
->action
);
1333 RESOLVE_TAG (&tag_e_delim
, open
->delim
);
1334 RESOLVE_TAG (&tag_e_pad
, open
->pad
);
1335 RESOLVE_TAG (&tag_convert
, open
->convert
);
1337 if (gfc_reference_st_label (open
->err
, ST_LABEL_TARGET
) == FAILURE
)
1344 /* Check if a given value for a SPECIFIER is either in the list of values
1345 allowed in F95 or F2003, issuing an error message and returning a zero
1346 value if it is not allowed. */
1349 compare_to_allowed_values (const char *specifier
, const char *allowed
[],
1350 const char *allowed_f2003
[],
1351 const char *allowed_gnu
[], char *value
,
1352 const char *statement
, bool warn
)
1357 len
= strlen (value
);
1360 for (len
--; len
> 0; len
--)
1361 if (value
[len
] != ' ')
1366 for (i
= 0; allowed
[i
]; i
++)
1367 if (len
== strlen (allowed
[i
])
1368 && strncasecmp (value
, allowed
[i
], strlen (allowed
[i
])) == 0)
1371 for (i
= 0; allowed_f2003
&& allowed_f2003
[i
]; i
++)
1372 if (len
== strlen (allowed_f2003
[i
])
1373 && strncasecmp (value
, allowed_f2003
[i
], strlen (allowed_f2003
[i
]))
1376 notification n
= gfc_notification_std (GFC_STD_F2003
);
1378 if (n
== WARNING
|| (warn
&& n
== ERROR
))
1380 gfc_warning ("Fortran 2003: %s specifier in %s statement at %C "
1381 "has value '%s'", specifier
, statement
,
1388 gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: %s specifier in "
1389 "%s statement at %C has value '%s'", specifier
,
1390 statement
, allowed_f2003
[i
]);
1398 for (i
= 0; allowed_gnu
&& allowed_gnu
[i
]; i
++)
1399 if (len
== strlen (allowed_gnu
[i
])
1400 && strncasecmp (value
, allowed_gnu
[i
], strlen (allowed_gnu
[i
])) == 0)
1402 notification n
= gfc_notification_std (GFC_STD_GNU
);
1404 if (n
== WARNING
|| (warn
&& n
== ERROR
))
1406 gfc_warning ("Extension: %s specifier in %s statement at %C "
1407 "has value '%s'", specifier
, statement
,
1414 gfc_notify_std (GFC_STD_GNU
, "Extension: %s specifier in "
1415 "%s statement at %C has value '%s'", specifier
,
1416 statement
, allowed_gnu
[i
]);
1426 gfc_warning ("%s specifier in %s statement at %C has invalid value '%s'",
1427 specifier
, statement
, value
);
1432 gfc_error ("%s specifier in %s statement at %C has invalid value '%s'",
1433 specifier
, statement
, value
);
1439 /* Match an OPEN statement. */
1442 gfc_match_open (void)
1448 m
= gfc_match_char ('(');
1452 open
= gfc_getmem (sizeof (gfc_open
));
1454 m
= match_open_element (open
);
1456 if (m
== MATCH_ERROR
)
1460 m
= gfc_match_expr (&open
->unit
);
1463 if (m
== MATCH_ERROR
)
1469 if (gfc_match_char (')') == MATCH_YES
)
1471 if (gfc_match_char (',') != MATCH_YES
)
1474 m
= match_open_element (open
);
1475 if (m
== MATCH_ERROR
)
1481 if (gfc_match_eos () == MATCH_NO
)
1484 if (gfc_pure (NULL
))
1486 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1490 warn
= (open
->err
|| open
->iostat
) ? true : false;
1491 /* Checks on the ACCESS specifier. */
1492 if (open
->access
&& open
->access
->expr_type
== EXPR_CONSTANT
)
1494 static const char *access_f95
[] = { "SEQUENTIAL", "DIRECT", NULL
};
1495 static const char *access_f2003
[] = { "STREAM", NULL
};
1496 static const char *access_gnu
[] = { "APPEND", NULL
};
1498 if (!compare_to_allowed_values ("ACCESS", access_f95
, access_f2003
,
1500 open
->access
->value
.character
.string
,
1505 /* Checks on the ACTION specifier. */
1506 if (open
->action
&& open
->action
->expr_type
== EXPR_CONSTANT
)
1508 static const char *action
[] = { "READ", "WRITE", "READWRITE", NULL
};
1510 if (!compare_to_allowed_values ("ACTION", action
, NULL
, NULL
,
1511 open
->action
->value
.character
.string
,
1516 /* Checks on the ASYNCHRONOUS specifier. */
1517 /* TODO: code is ready, just needs uncommenting when async I/O support
1519 if (open->asynchronous && open->asynchronous->expr_type == EXPR_CONSTANT)
1521 static const char * asynchronous[] = { "YES", "NO", NULL };
1523 if (!compare_to_allowed_values
1524 ("action", asynchronous, NULL, NULL,
1525 open->asynchronous->value.character.string, "OPEN", warn))
1529 /* Checks on the BLANK specifier. */
1530 if (open
->blank
&& open
->blank
->expr_type
== EXPR_CONSTANT
)
1532 static const char *blank
[] = { "ZERO", "NULL", NULL
};
1534 if (!compare_to_allowed_values ("BLANK", blank
, NULL
, NULL
,
1535 open
->blank
->value
.character
.string
,
1540 /* Checks on the DECIMAL specifier. */
1541 /* TODO: uncomment this code when DECIMAL support is added
1542 if (open->decimal && open->decimal->expr_type == EXPR_CONSTANT)
1544 static const char * decimal[] = { "COMMA", "POINT", NULL };
1546 if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL,
1547 open->decimal->value.character.string,
1552 /* Checks on the DELIM specifier. */
1553 if (open
->delim
&& open
->delim
->expr_type
== EXPR_CONSTANT
)
1555 static const char *delim
[] = { "APOSTROPHE", "QUOTE", "NONE", NULL
};
1557 if (!compare_to_allowed_values ("DELIM", delim
, NULL
, NULL
,
1558 open
->delim
->value
.character
.string
,
1563 /* Checks on the ENCODING specifier. */
1564 /* TODO: uncomment this code when ENCODING support is added
1565 if (open->encoding && open->encoding->expr_type == EXPR_CONSTANT)
1567 static const char * encoding[] = { "UTF-8", "DEFAULT", NULL };
1569 if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL,
1570 open->encoding->value.character.string,
1575 /* Checks on the FORM specifier. */
1576 if (open
->form
&& open
->form
->expr_type
== EXPR_CONSTANT
)
1578 static const char *form
[] = { "FORMATTED", "UNFORMATTED", NULL
};
1580 if (!compare_to_allowed_values ("FORM", form
, NULL
, NULL
,
1581 open
->form
->value
.character
.string
,
1586 /* Checks on the PAD specifier. */
1587 if (open
->pad
&& open
->pad
->expr_type
== EXPR_CONSTANT
)
1589 static const char *pad
[] = { "YES", "NO", NULL
};
1591 if (!compare_to_allowed_values ("PAD", pad
, NULL
, NULL
,
1592 open
->pad
->value
.character
.string
,
1597 /* Checks on the POSITION specifier. */
1598 if (open
->position
&& open
->position
->expr_type
== EXPR_CONSTANT
)
1600 static const char *position
[] = { "ASIS", "REWIND", "APPEND", NULL
};
1602 if (!compare_to_allowed_values ("POSITION", position
, NULL
, NULL
,
1603 open
->position
->value
.character
.string
,
1608 /* Checks on the ROUND specifier. */
1609 /* TODO: uncomment this code when ROUND support is added
1610 if (open->round && open->round->expr_type == EXPR_CONSTANT)
1612 static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST",
1613 "COMPATIBLE", "PROCESSOR_DEFINED", NULL };
1615 if (!compare_to_allowed_values ("ROUND", round, NULL, NULL,
1616 open->round->value.character.string,
1621 /* Checks on the SIGN specifier. */
1622 /* TODO: uncomment this code when SIGN support is added
1623 if (open->sign && open->sign->expr_type == EXPR_CONSTANT)
1625 static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED",
1628 if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL,
1629 open->sign->value.character.string,
1634 #define warn_or_error(...) \
1637 gfc_warning (__VA_ARGS__); \
1640 gfc_error (__VA_ARGS__); \
1645 /* Checks on the RECL specifier. */
1646 if (open
->recl
&& open
->recl
->expr_type
== EXPR_CONSTANT
1647 && open
->recl
->ts
.type
== BT_INTEGER
1648 && mpz_sgn (open
->recl
->value
.integer
) != 1)
1650 warn_or_error ("RECL in OPEN statement at %C must be positive");
1653 /* Checks on the STATUS specifier. */
1654 if (open
->status
&& open
->status
->expr_type
== EXPR_CONSTANT
)
1656 static const char *status
[] = { "OLD", "NEW", "SCRATCH",
1657 "REPLACE", "UNKNOWN", NULL
};
1659 if (!compare_to_allowed_values ("STATUS", status
, NULL
, NULL
,
1660 open
->status
->value
.character
.string
,
1664 /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE,
1665 the FILE= specifier shall appear. */
1666 if (open
->file
== NULL
1667 && (strncasecmp (open
->status
->value
.character
.string
, "replace", 7)
1669 || strncasecmp (open
->status
->value
.character
.string
, "new", 3)
1672 warn_or_error ("The STATUS specified in OPEN statement at %C is "
1673 "'%s' and no FILE specifier is present",
1674 open
->status
->value
.character
.string
);
1677 /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH,
1678 the FILE= specifier shall not appear. */
1679 if (strncasecmp (open
->status
->value
.character
.string
, "scratch", 7)
1682 warn_or_error ("The STATUS specified in OPEN statement at %C "
1683 "cannot have the value SCRATCH if a FILE specifier "
1688 /* Things that are not allowed for unformatted I/O. */
1689 if (open
->form
&& open
->form
->expr_type
== EXPR_CONSTANT
1691 /* TODO uncomment this code when F2003 support is finished */
1692 /* || open->decimal || open->encoding || open->round
1694 || open
->pad
|| open
->blank
)
1695 && strncasecmp (open
->form
->value
.character
.string
,
1696 "unformatted", 11) == 0)
1698 const char *spec
= (open
->delim
? "DELIM "
1699 : (open
->pad
? "PAD " : open
->blank
1702 warn_or_error ("%s specifier at %C not allowed in OPEN statement for "
1703 "unformatted I/O", spec
);
1706 if (open
->recl
&& open
->access
&& open
->access
->expr_type
== EXPR_CONSTANT
1707 && strncasecmp (open
->access
->value
.character
.string
, "stream", 6) == 0)
1709 warn_or_error ("RECL specifier not allowed in OPEN statement at %C for "
1714 && open
->access
&& open
->access
->expr_type
== EXPR_CONSTANT
1715 && !(strncasecmp (open
->access
->value
.character
.string
,
1716 "sequential", 10) == 0
1717 || strncasecmp (open
->access
->value
.character
.string
,
1719 || strncasecmp (open
->access
->value
.character
.string
,
1722 warn_or_error ("POSITION specifier in OPEN statement at %C only allowed "
1723 "for stream or sequential ACCESS");
1726 #undef warn_or_error
1728 new_st
.op
= EXEC_OPEN
;
1729 new_st
.ext
.open
= open
;
1733 gfc_syntax_error (ST_OPEN
);
1736 gfc_free_open (open
);
1741 /* Free a gfc_close structure an all its expressions. */
1744 gfc_free_close (gfc_close
*close
)
1749 gfc_free_expr (close
->unit
);
1750 gfc_free_expr (close
->iomsg
);
1751 gfc_free_expr (close
->iostat
);
1752 gfc_free_expr (close
->status
);
1757 /* Match elements of a CLOSE statement. */
1760 match_close_element (gfc_close
*close
)
1764 m
= match_etag (&tag_unit
, &close
->unit
);
1767 m
= match_etag (&tag_status
, &close
->status
);
1770 m
= match_out_tag (&tag_iomsg
, &close
->iomsg
);
1773 m
= match_out_tag (&tag_iostat
, &close
->iostat
);
1776 m
= match_ltag (&tag_err
, &close
->err
);
1784 /* Match a CLOSE statement. */
1787 gfc_match_close (void)
1793 m
= gfc_match_char ('(');
1797 close
= gfc_getmem (sizeof (gfc_close
));
1799 m
= match_close_element (close
);
1801 if (m
== MATCH_ERROR
)
1805 m
= gfc_match_expr (&close
->unit
);
1808 if (m
== MATCH_ERROR
)
1814 if (gfc_match_char (')') == MATCH_YES
)
1816 if (gfc_match_char (',') != MATCH_YES
)
1819 m
= match_close_element (close
);
1820 if (m
== MATCH_ERROR
)
1826 if (gfc_match_eos () == MATCH_NO
)
1829 if (gfc_pure (NULL
))
1831 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1835 warn
= (close
->iostat
|| close
->err
) ? true : false;
1837 /* Checks on the STATUS specifier. */
1838 if (close
->status
&& close
->status
->expr_type
== EXPR_CONSTANT
)
1840 static const char *status
[] = { "KEEP", "DELETE", NULL
};
1842 if (!compare_to_allowed_values ("STATUS", status
, NULL
, NULL
,
1843 close
->status
->value
.character
.string
,
1848 new_st
.op
= EXEC_CLOSE
;
1849 new_st
.ext
.close
= close
;
1853 gfc_syntax_error (ST_CLOSE
);
1856 gfc_free_close (close
);
1861 /* Resolve everything in a gfc_close structure. */
1864 gfc_resolve_close (gfc_close
*close
)
1866 RESOLVE_TAG (&tag_unit
, close
->unit
);
1867 RESOLVE_TAG (&tag_iomsg
, close
->iomsg
);
1868 RESOLVE_TAG (&tag_iostat
, close
->iostat
);
1869 RESOLVE_TAG (&tag_status
, close
->status
);
1871 if (gfc_reference_st_label (close
->err
, ST_LABEL_TARGET
) == FAILURE
)
1878 /* Free a gfc_filepos structure. */
1881 gfc_free_filepos (gfc_filepos
*fp
)
1883 gfc_free_expr (fp
->unit
);
1884 gfc_free_expr (fp
->iomsg
);
1885 gfc_free_expr (fp
->iostat
);
1890 /* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */
1893 match_file_element (gfc_filepos
*fp
)
1897 m
= match_etag (&tag_unit
, &fp
->unit
);
1900 m
= match_out_tag (&tag_iomsg
, &fp
->iomsg
);
1903 m
= match_out_tag (&tag_iostat
, &fp
->iostat
);
1906 m
= match_ltag (&tag_err
, &fp
->err
);
1914 /* Match the second half of the file-positioning statements, REWIND,
1915 BACKSPACE, ENDFILE, or the FLUSH statement. */
1918 match_filepos (gfc_statement st
, gfc_exec_op op
)
1923 fp
= gfc_getmem (sizeof (gfc_filepos
));
1925 if (gfc_match_char ('(') == MATCH_NO
)
1927 m
= gfc_match_expr (&fp
->unit
);
1928 if (m
== MATCH_ERROR
)
1936 m
= match_file_element (fp
);
1937 if (m
== MATCH_ERROR
)
1941 m
= gfc_match_expr (&fp
->unit
);
1942 if (m
== MATCH_ERROR
)
1950 if (gfc_match_char (')') == MATCH_YES
)
1952 if (gfc_match_char (',') != MATCH_YES
)
1955 m
= match_file_element (fp
);
1956 if (m
== MATCH_ERROR
)
1963 if (gfc_match_eos () != MATCH_YES
)
1966 if (gfc_pure (NULL
))
1968 gfc_error ("%s statement not allowed in PURE procedure at %C",
1969 gfc_ascii_statement (st
));
1975 new_st
.ext
.filepos
= fp
;
1979 gfc_syntax_error (st
);
1982 gfc_free_filepos (fp
);
1988 gfc_resolve_filepos (gfc_filepos
*fp
)
1990 RESOLVE_TAG (&tag_unit
, fp
->unit
);
1991 RESOLVE_TAG (&tag_iostat
, fp
->iostat
);
1992 RESOLVE_TAG (&tag_iomsg
, fp
->iomsg
);
1993 if (gfc_reference_st_label (fp
->err
, ST_LABEL_TARGET
) == FAILURE
)
2000 /* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
2001 and the FLUSH statement. */
2004 gfc_match_endfile (void)
2006 return match_filepos (ST_END_FILE
, EXEC_ENDFILE
);
2010 gfc_match_backspace (void)
2012 return match_filepos (ST_BACKSPACE
, EXEC_BACKSPACE
);
2016 gfc_match_rewind (void)
2018 return match_filepos (ST_REWIND
, EXEC_REWIND
);
2022 gfc_match_flush (void)
2024 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: FLUSH statement at %C")
2028 return match_filepos (ST_FLUSH
, EXEC_FLUSH
);
2031 /******************** Data Transfer Statements *********************/
2034 { M_READ
, M_WRITE
, M_PRINT
, M_INQUIRE
}
2038 /* Return a default unit number. */
2041 default_unit (io_kind k
)
2050 return gfc_int_expr (unit
);
2054 /* Match a unit specification for a data transfer statement. */
2057 match_dt_unit (io_kind k
, gfc_dt
*dt
)
2061 if (gfc_match_char ('*') == MATCH_YES
)
2063 if (dt
->io_unit
!= NULL
)
2066 dt
->io_unit
= default_unit (k
);
2070 if (gfc_match_expr (&e
) == MATCH_YES
)
2072 if (dt
->io_unit
!= NULL
)
2085 gfc_error ("Duplicate UNIT specification at %C");
2090 /* Match a format specification. */
2093 match_dt_format (gfc_dt
*dt
)
2097 gfc_st_label
*label
;
2099 where
= gfc_current_locus
;
2101 if (gfc_match_char ('*') == MATCH_YES
)
2103 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
2106 dt
->format_label
= &format_asterisk
;
2110 if (gfc_match_st_label (&label
) == MATCH_YES
)
2112 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
2114 gfc_free_st_label (label
);
2118 if (gfc_reference_st_label (label
, ST_LABEL_FORMAT
) == FAILURE
)
2121 dt
->format_label
= label
;
2125 if (gfc_match_expr (&e
) == MATCH_YES
)
2127 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
2132 dt
->format_expr
= e
;
2136 gfc_current_locus
= where
; /* The only case where we have to restore */
2141 gfc_error ("Duplicate format specification at %C");
2146 /* Traverse a namelist that is part of a READ statement to make sure
2147 that none of the variables in the namelist are INTENT(IN). Returns
2148 nonzero if we find such a variable. */
2151 check_namelist (gfc_symbol
*sym
)
2155 for (p
= sym
->namelist
; p
; p
= p
->next
)
2156 if (p
->sym
->attr
.intent
== INTENT_IN
)
2158 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
2159 p
->sym
->name
, sym
->name
);
2167 /* Match a single data transfer element. */
2170 match_dt_element (io_kind k
, gfc_dt
*dt
)
2172 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
2176 if (gfc_match (" unit =") == MATCH_YES
)
2178 m
= match_dt_unit (k
, dt
);
2183 if (gfc_match (" fmt =") == MATCH_YES
)
2185 m
= match_dt_format (dt
);
2190 if (gfc_match (" nml = %n", name
) == MATCH_YES
)
2192 if (dt
->namelist
!= NULL
)
2194 gfc_error ("Duplicate NML specification at %C");
2198 if (gfc_find_symbol (name
, NULL
, 1, &sym
))
2201 if (sym
== NULL
|| sym
->attr
.flavor
!= FL_NAMELIST
)
2203 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
2204 sym
!= NULL
? sym
->name
: name
);
2209 if (k
== M_READ
&& check_namelist (sym
))
2215 m
= match_etag (&tag_rec
, &dt
->rec
);
2218 m
= match_etag (&tag_spos
, &dt
->rec
);
2221 m
= match_out_tag (&tag_iomsg
, &dt
->iomsg
);
2224 m
= match_out_tag (&tag_iostat
, &dt
->iostat
);
2227 m
= match_ltag (&tag_err
, &dt
->err
);
2229 dt
->err_where
= gfc_current_locus
;
2232 m
= match_etag (&tag_advance
, &dt
->advance
);
2235 m
= match_out_tag (&tag_size
, &dt
->size
);
2239 m
= match_ltag (&tag_end
, &dt
->end
);
2244 gfc_error ("END tag at %C not allowed in output statement");
2247 dt
->end_where
= gfc_current_locus
;
2252 m
= match_ltag (&tag_eor
, &dt
->eor
);
2254 dt
->eor_where
= gfc_current_locus
;
2262 /* Free a data transfer structure and everything below it. */
2265 gfc_free_dt (gfc_dt
*dt
)
2270 gfc_free_expr (dt
->io_unit
);
2271 gfc_free_expr (dt
->format_expr
);
2272 gfc_free_expr (dt
->rec
);
2273 gfc_free_expr (dt
->advance
);
2274 gfc_free_expr (dt
->iomsg
);
2275 gfc_free_expr (dt
->iostat
);
2276 gfc_free_expr (dt
->size
);
2281 /* Resolve everything in a gfc_dt structure. */
2284 gfc_resolve_dt (gfc_dt
*dt
)
2288 RESOLVE_TAG (&tag_format
, dt
->format_expr
);
2289 RESOLVE_TAG (&tag_rec
, dt
->rec
);
2290 RESOLVE_TAG (&tag_spos
, dt
->rec
);
2291 RESOLVE_TAG (&tag_advance
, dt
->advance
);
2292 RESOLVE_TAG (&tag_iomsg
, dt
->iomsg
);
2293 RESOLVE_TAG (&tag_iostat
, dt
->iostat
);
2294 RESOLVE_TAG (&tag_size
, dt
->size
);
2297 if (gfc_resolve_expr (e
) == SUCCESS
2298 && (e
->ts
.type
!= BT_INTEGER
2299 && (e
->ts
.type
!= BT_CHARACTER
|| e
->expr_type
!= EXPR_VARIABLE
)))
2301 gfc_error ("UNIT specification at %L must be an INTEGER expression "
2302 "or a CHARACTER variable", &e
->where
);
2306 if (e
->ts
.type
== BT_CHARACTER
)
2308 if (gfc_has_vector_index (e
))
2310 gfc_error ("Internal unit with vector subscript at %L", &e
->where
);
2315 if (e
->rank
&& e
->ts
.type
!= BT_CHARACTER
)
2317 gfc_error ("External IO UNIT cannot be an array at %L", &e
->where
);
2323 if (gfc_reference_st_label (dt
->err
, ST_LABEL_TARGET
) == FAILURE
)
2325 if (dt
->err
->defined
== ST_LABEL_UNKNOWN
)
2327 gfc_error ("ERR tag label %d at %L not defined",
2328 dt
->err
->value
, &dt
->err_where
);
2335 if (gfc_reference_st_label (dt
->end
, ST_LABEL_TARGET
) == FAILURE
)
2337 if (dt
->end
->defined
== ST_LABEL_UNKNOWN
)
2339 gfc_error ("END tag label %d at %L not defined",
2340 dt
->end
->value
, &dt
->end_where
);
2347 if (gfc_reference_st_label (dt
->eor
, ST_LABEL_TARGET
) == FAILURE
)
2349 if (dt
->eor
->defined
== ST_LABEL_UNKNOWN
)
2351 gfc_error ("EOR tag label %d at %L not defined",
2352 dt
->eor
->value
, &dt
->eor_where
);
2357 /* Check the format label actually exists. */
2358 if (dt
->format_label
&& dt
->format_label
!= &format_asterisk
2359 && dt
->format_label
->defined
== ST_LABEL_UNKNOWN
)
2361 gfc_error ("FORMAT label %d at %L not defined", dt
->format_label
->value
,
2362 &dt
->format_label
->where
);
2369 /* Given an io_kind, return its name. */
2372 io_kind_name (io_kind k
)
2391 gfc_internal_error ("io_kind_name(): bad I/O-kind");
2398 /* Match an IO iteration statement of the form:
2400 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
2402 which is equivalent to a single IO element. This function is
2403 mutually recursive with match_io_element(). */
2405 static match
match_io_element (io_kind
, gfc_code
**);
2408 match_io_iterator (io_kind k
, gfc_code
**result
)
2410 gfc_code
*head
, *tail
, *new;
2418 old_loc
= gfc_current_locus
;
2420 if (gfc_match_char ('(') != MATCH_YES
)
2423 m
= match_io_element (k
, &head
);
2426 if (m
!= MATCH_YES
|| gfc_match_char (',') != MATCH_YES
)
2432 /* Can't be anything but an IO iterator. Build a list. */
2433 iter
= gfc_get_iterator ();
2437 m
= gfc_match_iterator (iter
, 0);
2438 if (m
== MATCH_ERROR
)
2442 gfc_check_do_variable (iter
->var
->symtree
);
2446 m
= match_io_element (k
, &new);
2447 if (m
== MATCH_ERROR
)
2456 tail
= gfc_append_code (tail
, new);
2458 if (gfc_match_char (',') != MATCH_YES
)
2467 if (gfc_match_char (')') != MATCH_YES
)
2470 new = gfc_get_code ();
2472 new->ext
.iterator
= iter
;
2474 new->block
= gfc_get_code ();
2475 new->block
->op
= EXEC_DO
;
2476 new->block
->next
= head
;
2482 gfc_error ("Syntax error in I/O iterator at %C");
2486 gfc_free_iterator (iter
, 1);
2487 gfc_free_statements (head
);
2488 gfc_current_locus
= old_loc
;
2493 /* Match a single element of an IO list, which is either a single
2494 expression or an IO Iterator. */
2497 match_io_element (io_kind k
, gfc_code
**cpp
)
2505 m
= match_io_iterator (k
, cpp
);
2511 m
= gfc_match_variable (&expr
, 0);
2513 gfc_error ("Expected variable in READ statement at %C");
2517 m
= gfc_match_expr (&expr
);
2519 gfc_error ("Expected expression in %s statement at %C",
2527 if (expr
->symtree
->n
.sym
->attr
.intent
== INTENT_IN
)
2529 gfc_error ("Variable '%s' in input list at %C cannot be "
2530 "INTENT(IN)", expr
->symtree
->n
.sym
->name
);
2535 && gfc_impure_variable (expr
->symtree
->n
.sym
)
2536 && current_dt
->io_unit
->ts
.type
== BT_CHARACTER
)
2538 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
2539 expr
->symtree
->n
.sym
->name
);
2543 if (gfc_check_do_variable (expr
->symtree
))
2549 if (current_dt
->io_unit
->ts
.type
== BT_CHARACTER
2551 && current_dt
->io_unit
->expr_type
== EXPR_VARIABLE
2552 && gfc_impure_variable (current_dt
->io_unit
->symtree
->n
.sym
))
2554 gfc_error ("Cannot write to internal file unit '%s' at %C "
2555 "inside a PURE procedure",
2556 current_dt
->io_unit
->symtree
->n
.sym
->name
);
2568 gfc_free_expr (expr
);
2572 cp
= gfc_get_code ();
2573 cp
->op
= EXEC_TRANSFER
;
2581 /* Match an I/O list, building gfc_code structures as we go. */
2584 match_io_list (io_kind k
, gfc_code
**head_p
)
2586 gfc_code
*head
, *tail
, *new;
2589 *head_p
= head
= tail
= NULL
;
2590 if (gfc_match_eos () == MATCH_YES
)
2595 m
= match_io_element (k
, &new);
2596 if (m
== MATCH_ERROR
)
2601 tail
= gfc_append_code (tail
, new);
2605 if (gfc_match_eos () == MATCH_YES
)
2607 if (gfc_match_char (',') != MATCH_YES
)
2615 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k
));
2618 gfc_free_statements (head
);
2623 /* Attach the data transfer end node. */
2626 terminate_io (gfc_code
*io_code
)
2630 if (io_code
== NULL
)
2631 io_code
= new_st
.block
;
2633 c
= gfc_get_code ();
2634 c
->op
= EXEC_DT_END
;
2636 /* Point to structure that is already there */
2637 c
->ext
.dt
= new_st
.ext
.dt
;
2638 gfc_append_code (io_code
, c
);
2642 /* Check the constraints for a data transfer statement. The majority of the
2643 constraints appearing in 9.4 of the standard appear here. Some are handled
2644 in resolve_tag and others in gfc_resolve_dt. */
2647 check_io_constraints (io_kind k
, gfc_dt
*dt
, gfc_code
*io_code
,
2650 #define io_constraint(condition,msg,arg)\
2653 gfc_error(msg,arg);\
2659 gfc_symbol
*sym
= NULL
;
2664 if (expr
&& expr
->expr_type
== EXPR_VARIABLE
2665 && expr
->ts
.type
== BT_CHARACTER
)
2667 sym
= expr
->symtree
->n
.sym
;
2669 io_constraint (k
== M_WRITE
&& sym
->attr
.intent
== INTENT_IN
,
2670 "Internal file at %L must not be INTENT(IN)",
2673 io_constraint (gfc_has_vector_index (dt
->io_unit
),
2674 "Internal file incompatible with vector subscript at %L",
2677 io_constraint (dt
->rec
!= NULL
,
2678 "REC tag at %L is incompatible with internal file",
2681 if (dt
->namelist
!= NULL
)
2683 if (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: Internal file "
2684 "at %L with namelist", &expr
->where
)
2689 io_constraint (dt
->advance
!= NULL
,
2690 "ADVANCE tag at %L is incompatible with internal file",
2691 &dt
->advance
->where
);
2694 if (expr
&& expr
->ts
.type
!= BT_CHARACTER
)
2697 io_constraint (gfc_pure (NULL
) && (k
== M_READ
|| k
== M_WRITE
),
2698 "IO UNIT in %s statement at %C must be "
2699 "an internal file in a PURE procedure",
2706 io_constraint (dt
->end
, "END tag not allowed with output at %L",
2709 io_constraint (dt
->eor
, "EOR tag not allowed with output at %L",
2712 io_constraint (k
!= M_READ
&& dt
->size
,
2713 "SIZE=specifier not allowed with output at %L",
2718 io_constraint (dt
->size
&& dt
->advance
== NULL
,
2719 "SIZE tag at %L requires an ADVANCE tag",
2722 io_constraint (dt
->eor
&& dt
->advance
== NULL
,
2723 "EOR tag at %L requires an ADVANCE tag",
2731 io_constraint (io_code
&& dt
->namelist
,
2732 "NAMELIST cannot be followed by IO-list at %L",
2735 io_constraint (dt
->format_expr
,
2736 "IO spec-list cannot contain both NAMELIST group name "
2737 "and format specification at %L.",
2738 &dt
->format_expr
->where
);
2740 io_constraint (dt
->format_label
,
2741 "IO spec-list cannot contain both NAMELIST group name "
2742 "and format label at %L", spec_end
);
2744 io_constraint (dt
->rec
,
2745 "NAMELIST IO is not allowed with a REC=specifier "
2746 "at %L.", &dt
->rec
->where
);
2748 io_constraint (dt
->advance
,
2749 "NAMELIST IO is not allowed with a ADVANCE=specifier "
2750 "at %L.", &dt
->advance
->where
);
2755 io_constraint (dt
->end
,
2756 "An END tag is not allowed with a "
2757 "REC=specifier at %L.", &dt
->end_where
);
2760 io_constraint (dt
->format_label
== &format_asterisk
,
2761 "FMT=* is not allowed with a REC=specifier "
2762 "at %L.", spec_end
);
2767 int not_yes
, not_no
;
2770 io_constraint (dt
->format_label
== &format_asterisk
,
2771 "List directed format(*) is not allowed with a "
2772 "ADVANCE=specifier at %L.", &expr
->where
);
2774 io_constraint (dt
->format_expr
== NULL
&& dt
->format_label
== NULL
2775 && dt
->namelist
== NULL
,
2776 "the ADVANCE=specifier at %L must appear with an "
2777 "explicit format expression", &expr
->where
);
2779 if (expr
->expr_type
== EXPR_CONSTANT
&& expr
->ts
.type
== BT_CHARACTER
)
2781 const char * advance
= expr
->value
.character
.string
;
2782 not_no
= strcasecmp (advance
, "no") != 0;
2783 not_yes
= strcasecmp (advance
, "yes") != 0;
2791 io_constraint (not_no
&& not_yes
,
2792 "ADVANCE=specifier at %L must have value = "
2793 "YES or NO.", &expr
->where
);
2795 io_constraint (dt
->size
&& not_no
&& k
== M_READ
,
2796 "SIZE tag at %L requires an ADVANCE = 'NO'",
2799 io_constraint (dt
->eor
&& not_no
&& k
== M_READ
,
2800 "EOR tag at %L requires an ADVANCE = 'NO'",
2804 expr
= dt
->format_expr
;
2805 if (expr
!= NULL
&& expr
->expr_type
== EXPR_CONSTANT
2806 && check_format_string (expr
, k
== M_READ
) == FAILURE
)
2811 #undef io_constraint
2814 /* Match a READ, WRITE or PRINT statement. */
2817 match_io (io_kind k
)
2819 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
2828 where
= gfc_current_locus
;
2830 current_dt
= dt
= gfc_getmem (sizeof (gfc_dt
));
2831 m
= gfc_match_char ('(');
2834 where
= gfc_current_locus
;
2837 else if (k
== M_PRINT
)
2839 /* Treat the non-standard case of PRINT namelist. */
2840 if ((gfc_current_form
== FORM_FIXED
|| gfc_peek_char () == ' ')
2841 && gfc_match_name (name
) == MATCH_YES
)
2843 gfc_find_symbol (name
, NULL
, 1, &sym
);
2844 if (sym
&& sym
->attr
.flavor
== FL_NAMELIST
)
2846 if (gfc_notify_std (GFC_STD_GNU
, "PRINT namelist at "
2847 "%C is an extension") == FAILURE
)
2853 dt
->io_unit
= default_unit (k
);
2858 gfc_current_locus
= where
;
2862 if (gfc_current_form
== FORM_FREE
)
2864 c
= gfc_peek_char();
2865 if (c
!= ' ' && c
!= '*' && c
!= '\'' && c
!= '"')
2872 m
= match_dt_format (dt
);
2873 if (m
== MATCH_ERROR
)
2879 dt
->io_unit
= default_unit (k
);
2884 /* Before issuing an error for a malformed 'print (1,*)' type of
2885 error, check for a default-char-expr of the form ('(I0)'). */
2886 if (k
== M_PRINT
&& m
== MATCH_YES
)
2888 /* Reset current locus to get the initial '(' in an expression. */
2889 gfc_current_locus
= where
;
2890 dt
->format_expr
= NULL
;
2891 m
= match_dt_format (dt
);
2893 if (m
== MATCH_ERROR
)
2895 if (m
== MATCH_NO
|| dt
->format_expr
== NULL
)
2899 dt
->io_unit
= default_unit (k
);
2904 /* Match a control list */
2905 if (match_dt_element (k
, dt
) == MATCH_YES
)
2907 if (match_dt_unit (k
, dt
) != MATCH_YES
)
2910 if (gfc_match_char (')') == MATCH_YES
)
2912 if (gfc_match_char (',') != MATCH_YES
)
2915 m
= match_dt_element (k
, dt
);
2918 if (m
== MATCH_ERROR
)
2921 m
= match_dt_format (dt
);
2924 if (m
== MATCH_ERROR
)
2927 where
= gfc_current_locus
;
2929 m
= gfc_match_name (name
);
2932 gfc_find_symbol (name
, NULL
, 1, &sym
);
2933 if (sym
&& sym
->attr
.flavor
== FL_NAMELIST
)
2936 if (k
== M_READ
&& check_namelist (sym
))
2945 gfc_current_locus
= where
;
2947 goto loop
; /* No matches, try regular elements */
2950 if (gfc_match_char (')') == MATCH_YES
)
2952 if (gfc_match_char (',') != MATCH_YES
)
2958 m
= match_dt_element (k
, dt
);
2961 if (m
== MATCH_ERROR
)
2964 if (gfc_match_char (')') == MATCH_YES
)
2966 if (gfc_match_char (',') != MATCH_YES
)
2972 /* Used in check_io_constraints, where no locus is available. */
2973 spec_end
= gfc_current_locus
;
2975 /* Optional leading comma (non-standard). */
2977 && gfc_match_char (',') == MATCH_YES
2979 && gfc_notify_std (GFC_STD_GNU
, "Extension: Comma before output "
2980 "item list at %C is an extension") == FAILURE
)
2984 if (gfc_match_eos () != MATCH_YES
)
2986 if (comma_flag
&& gfc_match_char (',') != MATCH_YES
)
2988 gfc_error ("Expected comma in I/O list at %C");
2993 m
= match_io_list (k
, &io_code
);
2994 if (m
== MATCH_ERROR
)
3000 /* A full IO statement has been matched. Check the constraints. spec_end is
3001 supplied for cases where no locus is supplied. */
3002 m
= check_io_constraints (k
, dt
, io_code
, &spec_end
);
3004 if (m
== MATCH_ERROR
)
3007 new_st
.op
= (k
== M_READ
) ? EXEC_READ
: EXEC_WRITE
;
3009 new_st
.block
= gfc_get_code ();
3010 new_st
.block
->op
= new_st
.op
;
3011 new_st
.block
->next
= io_code
;
3013 terminate_io (io_code
);
3018 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k
));
3028 gfc_match_read (void)
3030 return match_io (M_READ
);
3034 gfc_match_write (void)
3036 return match_io (M_WRITE
);
3040 gfc_match_print (void)
3044 m
= match_io (M_PRINT
);
3048 if (gfc_pure (NULL
))
3050 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
3058 /* Free a gfc_inquire structure. */
3061 gfc_free_inquire (gfc_inquire
*inquire
)
3064 if (inquire
== NULL
)
3067 gfc_free_expr (inquire
->unit
);
3068 gfc_free_expr (inquire
->file
);
3069 gfc_free_expr (inquire
->iomsg
);
3070 gfc_free_expr (inquire
->iostat
);
3071 gfc_free_expr (inquire
->exist
);
3072 gfc_free_expr (inquire
->opened
);
3073 gfc_free_expr (inquire
->number
);
3074 gfc_free_expr (inquire
->named
);
3075 gfc_free_expr (inquire
->name
);
3076 gfc_free_expr (inquire
->access
);
3077 gfc_free_expr (inquire
->sequential
);
3078 gfc_free_expr (inquire
->direct
);
3079 gfc_free_expr (inquire
->form
);
3080 gfc_free_expr (inquire
->formatted
);
3081 gfc_free_expr (inquire
->unformatted
);
3082 gfc_free_expr (inquire
->recl
);
3083 gfc_free_expr (inquire
->nextrec
);
3084 gfc_free_expr (inquire
->blank
);
3085 gfc_free_expr (inquire
->position
);
3086 gfc_free_expr (inquire
->action
);
3087 gfc_free_expr (inquire
->read
);
3088 gfc_free_expr (inquire
->write
);
3089 gfc_free_expr (inquire
->readwrite
);
3090 gfc_free_expr (inquire
->delim
);
3091 gfc_free_expr (inquire
->pad
);
3092 gfc_free_expr (inquire
->iolength
);
3093 gfc_free_expr (inquire
->convert
);
3094 gfc_free_expr (inquire
->strm_pos
);
3099 /* Match an element of an INQUIRE statement. */
3101 #define RETM if (m != MATCH_NO) return m;
3104 match_inquire_element (gfc_inquire
*inquire
)
3108 m
= match_etag (&tag_unit
, &inquire
->unit
);
3109 RETM m
= match_etag (&tag_file
, &inquire
->file
);
3110 RETM m
= match_ltag (&tag_err
, &inquire
->err
);
3111 RETM m
= match_out_tag (&tag_iomsg
, &inquire
->iomsg
);
3112 RETM m
= match_out_tag (&tag_iostat
, &inquire
->iostat
);
3113 RETM m
= match_vtag (&tag_exist
, &inquire
->exist
);
3114 RETM m
= match_vtag (&tag_opened
, &inquire
->opened
);
3115 RETM m
= match_vtag (&tag_named
, &inquire
->named
);
3116 RETM m
= match_vtag (&tag_name
, &inquire
->name
);
3117 RETM m
= match_out_tag (&tag_number
, &inquire
->number
);
3118 RETM m
= match_vtag (&tag_s_access
, &inquire
->access
);
3119 RETM m
= match_vtag (&tag_sequential
, &inquire
->sequential
);
3120 RETM m
= match_vtag (&tag_direct
, &inquire
->direct
);
3121 RETM m
= match_vtag (&tag_s_form
, &inquire
->form
);
3122 RETM m
= match_vtag (&tag_formatted
, &inquire
->formatted
);
3123 RETM m
= match_vtag (&tag_unformatted
, &inquire
->unformatted
);
3124 RETM m
= match_out_tag (&tag_s_recl
, &inquire
->recl
);
3125 RETM m
= match_out_tag (&tag_nextrec
, &inquire
->nextrec
);
3126 RETM m
= match_vtag (&tag_s_blank
, &inquire
->blank
);
3127 RETM m
= match_vtag (&tag_s_position
, &inquire
->position
);
3128 RETM m
= match_vtag (&tag_s_action
, &inquire
->action
);
3129 RETM m
= match_vtag (&tag_read
, &inquire
->read
);
3130 RETM m
= match_vtag (&tag_write
, &inquire
->write
);
3131 RETM m
= match_vtag (&tag_readwrite
, &inquire
->readwrite
);
3132 RETM m
= match_vtag (&tag_s_delim
, &inquire
->delim
);
3133 RETM m
= match_vtag (&tag_s_pad
, &inquire
->pad
);
3134 RETM m
= match_vtag (&tag_iolength
, &inquire
->iolength
);
3135 RETM m
= match_vtag (&tag_convert
, &inquire
->convert
);
3136 RETM m
= match_out_tag (&tag_strm_out
, &inquire
->strm_pos
);
3137 RETM
return MATCH_NO
;
3144 gfc_match_inquire (void)
3146 gfc_inquire
*inquire
;
3151 m
= gfc_match_char ('(');
3155 inquire
= gfc_getmem (sizeof (gfc_inquire
));
3157 loc
= gfc_current_locus
;
3159 m
= match_inquire_element (inquire
);
3160 if (m
== MATCH_ERROR
)
3164 m
= gfc_match_expr (&inquire
->unit
);
3165 if (m
== MATCH_ERROR
)
3171 /* See if we have the IOLENGTH form of the inquire statement. */
3172 if (inquire
->iolength
!= NULL
)
3174 if (gfc_match_char (')') != MATCH_YES
)
3177 m
= match_io_list (M_INQUIRE
, &code
);
3178 if (m
== MATCH_ERROR
)
3183 new_st
.op
= EXEC_IOLENGTH
;
3184 new_st
.expr
= inquire
->iolength
;
3185 new_st
.ext
.inquire
= inquire
;
3187 if (gfc_pure (NULL
))
3189 gfc_free_statements (code
);
3190 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3194 new_st
.block
= gfc_get_code ();
3195 new_st
.block
->op
= EXEC_IOLENGTH
;
3196 terminate_io (code
);
3197 new_st
.block
->next
= code
;
3201 /* At this point, we have the non-IOLENGTH inquire statement. */
3204 if (gfc_match_char (')') == MATCH_YES
)
3206 if (gfc_match_char (',') != MATCH_YES
)
3209 m
= match_inquire_element (inquire
);
3210 if (m
== MATCH_ERROR
)
3215 if (inquire
->iolength
!= NULL
)
3217 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
3222 if (gfc_match_eos () != MATCH_YES
)
3225 if (inquire
->unit
!= NULL
&& inquire
->file
!= NULL
)
3227 gfc_error ("INQUIRE statement at %L cannot contain both FILE and "
3228 "UNIT specifiers", &loc
);
3232 if (inquire
->unit
== NULL
&& inquire
->file
== NULL
)
3234 gfc_error ("INQUIRE statement at %L requires either FILE or "
3235 "UNIT specifier", &loc
);
3239 if (gfc_pure (NULL
))
3241 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
3245 new_st
.op
= EXEC_INQUIRE
;
3246 new_st
.ext
.inquire
= inquire
;
3250 gfc_syntax_error (ST_INQUIRE
);
3253 gfc_free_inquire (inquire
);
3258 /* Resolve everything in a gfc_inquire structure. */
3261 gfc_resolve_inquire (gfc_inquire
*inquire
)
3263 RESOLVE_TAG (&tag_unit
, inquire
->unit
);
3264 RESOLVE_TAG (&tag_file
, inquire
->file
);
3265 RESOLVE_TAG (&tag_iomsg
, inquire
->iomsg
);
3266 RESOLVE_TAG (&tag_iostat
, inquire
->iostat
);
3267 RESOLVE_TAG (&tag_exist
, inquire
->exist
);
3268 RESOLVE_TAG (&tag_opened
, inquire
->opened
);
3269 RESOLVE_TAG (&tag_number
, inquire
->number
);
3270 RESOLVE_TAG (&tag_named
, inquire
->named
);
3271 RESOLVE_TAG (&tag_name
, inquire
->name
);
3272 RESOLVE_TAG (&tag_s_access
, inquire
->access
);
3273 RESOLVE_TAG (&tag_sequential
, inquire
->sequential
);
3274 RESOLVE_TAG (&tag_direct
, inquire
->direct
);
3275 RESOLVE_TAG (&tag_s_form
, inquire
->form
);
3276 RESOLVE_TAG (&tag_formatted
, inquire
->formatted
);
3277 RESOLVE_TAG (&tag_unformatted
, inquire
->unformatted
);
3278 RESOLVE_TAG (&tag_s_recl
, inquire
->recl
);
3279 RESOLVE_TAG (&tag_nextrec
, inquire
->nextrec
);
3280 RESOLVE_TAG (&tag_s_blank
, inquire
->blank
);
3281 RESOLVE_TAG (&tag_s_position
, inquire
->position
);
3282 RESOLVE_TAG (&tag_s_action
, inquire
->action
);
3283 RESOLVE_TAG (&tag_read
, inquire
->read
);
3284 RESOLVE_TAG (&tag_write
, inquire
->write
);
3285 RESOLVE_TAG (&tag_readwrite
, inquire
->readwrite
);
3286 RESOLVE_TAG (&tag_s_delim
, inquire
->delim
);
3287 RESOLVE_TAG (&tag_s_pad
, inquire
->pad
);
3288 RESOLVE_TAG (&tag_iolength
, inquire
->iolength
);
3289 RESOLVE_TAG (&tag_convert
, inquire
->convert
);
3290 RESOLVE_TAG (&tag_strm_out
, inquire
->strm_pos
);
3292 if (gfc_reference_st_label (inquire
->err
, ST_LABEL_TARGET
) == FAILURE
)