1 /* Deal with I/O statements & related stuff.
2 Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
32 gfc_st_label format_asterisk
=
33 { -1, ST_LABEL_FORMAT
, ST_LABEL_FORMAT
, NULL
, 0,
34 {NULL
, NULL
}, NULL
, NULL
};
38 const char *name
, *spec
;
44 tag_file
= { "FILE", " file = %e", BT_CHARACTER
},
45 tag_status
= { "STATUS", " status = %e", BT_CHARACTER
},
46 tag_e_access
= {"ACCESS", " access = %e", BT_CHARACTER
},
47 tag_e_form
= {"FORM", " form = %e", BT_CHARACTER
},
48 tag_e_recl
= {"RECL", " recl = %e", BT_INTEGER
},
49 tag_e_blank
= {"BLANK", " blank = %e", BT_CHARACTER
},
50 tag_e_position
= {"POSITION", " position = %e", BT_CHARACTER
},
51 tag_e_action
= {"ACTION", " action = %e", BT_CHARACTER
},
52 tag_e_delim
= {"DELIM", " delim = %e", BT_CHARACTER
},
53 tag_e_pad
= {"PAD", " pad = %e", BT_CHARACTER
},
54 tag_unit
= {"UNIT", " unit = %e", BT_INTEGER
},
55 tag_advance
= {"ADVANCE", " advance = %e", BT_CHARACTER
},
56 tag_rec
= {"REC", " rec = %e", BT_INTEGER
},
57 tag_format
= {"FORMAT", NULL
, BT_CHARACTER
},
58 tag_iostat
= {"IOSTAT", " iostat = %v", BT_INTEGER
},
59 tag_size
= {"SIZE", " size = %v", BT_INTEGER
},
60 tag_exist
= {"EXIST", " exist = %v", BT_LOGICAL
},
61 tag_opened
= {"OPENED", " opened = %v", BT_LOGICAL
},
62 tag_named
= {"NAMED", " named = %v", BT_LOGICAL
},
63 tag_name
= {"NAME", " name = %v", BT_CHARACTER
},
64 tag_number
= {"NUMBER", " number = %v", BT_INTEGER
},
65 tag_s_access
= {"ACCESS", " access = %v", BT_CHARACTER
},
66 tag_sequential
= {"SEQUENTIAL", " sequential = %v", BT_CHARACTER
},
67 tag_direct
= {"DIRECT", " direct = %v", BT_CHARACTER
},
68 tag_s_form
= {"FORM", " form = %v", BT_CHARACTER
},
69 tag_formatted
= {"FORMATTED", " formatted = %v", BT_CHARACTER
},
70 tag_unformatted
= {"UNFORMATTED", " unformatted = %v", BT_CHARACTER
},
71 tag_s_recl
= {"RECL", " recl = %v", BT_INTEGER
},
72 tag_nextrec
= {"NEXTREC", " nextrec = %v", BT_INTEGER
},
73 tag_s_blank
= {"BLANK", " blank = %v", BT_CHARACTER
},
74 tag_s_position
= {"POSITION", " position = %v", BT_CHARACTER
},
75 tag_s_action
= {"ACTION", " action = %v", BT_CHARACTER
},
76 tag_read
= {"READ", " read = %v", BT_CHARACTER
},
77 tag_write
= {"WRITE", " write = %v", BT_CHARACTER
},
78 tag_readwrite
= {"READWRITE", " readwrite = %v", BT_CHARACTER
},
79 tag_s_delim
= {"DELIM", " delim = %v", BT_CHARACTER
},
80 tag_s_pad
= {"PAD", " pad = %v", BT_CHARACTER
},
81 tag_iolength
= {"IOLENGTH", " iolength = %v", BT_INTEGER
},
82 tag_err
= {"ERR", " err = %l", BT_UNKNOWN
},
83 tag_end
= {"END", " end = %l", BT_UNKNOWN
},
84 tag_eor
= {"EOR", " eor = %l", BT_UNKNOWN
};
86 static gfc_dt
*current_dt
;
88 #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
91 /**************** Fortran 95 FORMAT parser *****************/
93 /* FORMAT tokens returned by format_lex(). */
96 FMT_NONE
, FMT_UNKNOWN
, FMT_SIGNED_INT
, FMT_ZERO
, FMT_POSINT
, FMT_PERIOD
,
97 FMT_COMMA
, FMT_COLON
, FMT_SLASH
, FMT_DOLLAR
, FMT_POS
, FMT_LPAREN
,
98 FMT_RPAREN
, FMT_X
, FMT_SIGN
, FMT_BLANK
, FMT_CHAR
, FMT_P
, FMT_IBOZ
, FMT_F
,
99 FMT_E
, FMT_EXT
, FMT_G
, FMT_L
, FMT_A
, FMT_D
, FMT_H
, FMT_END
103 /* Local variables for checking format strings. The saved_token is
104 used to back up by a single format token during the parsing
106 static char *format_string
;
107 static int format_length
, use_last_char
;
109 static format_token saved_token
;
112 { MODE_STRING
, MODE_FORMAT
, MODE_COPY
}
116 /* Return the next character in the format string. */
119 next_char (int in_string
)
131 if (mode
== MODE_STRING
)
132 c
= *format_string
++;
135 c
= gfc_next_char_literal (in_string
);
139 if (mode
== MODE_COPY
)
140 *format_string
++ = c
;
148 /* Back up one character position. Only works once. */
157 static int value
= 0;
159 /* Simple lexical analyzer for getting the next token in a FORMAT
170 if (saved_token
!= FMT_NONE
)
173 saved_token
= FMT_NONE
;
181 while (gfc_is_whitespace (c
));
202 value
= 10 * value
+ c
- '0';
211 token
= FMT_SIGNED_INT
;
234 value
= 10 * value
+ c
- '0';
239 token
= zflag
? FMT_ZERO
: FMT_POSINT
;
264 if (c
!= 'L' && c
!= 'R')
284 if (c
!= 'P' && c
!= 'S')
292 if (c
== 'N' || c
== 'Z')
354 if (c
== 'N' || c
== 'S')
397 /* Check a format statement. The format string, either from a FORMAT
398 statement or a constant in an I/O statement has already been parsed
399 by itself, and we are checking it for validity. The dual origin
400 means that the warning message is a little less than great. */
405 const char *posint_required
= "Positive width required";
406 const char *period_required
= "Period required";
407 const char *nonneg_required
= "Nonnegative width required";
408 const char *unexpected_element
= "Unexpected element";
409 const char *unexpected_end
= "Unexpected end of format string";
418 saved_token
= FMT_NONE
;
426 error
= "Missing leading left parenthesis";
432 goto finished
; /* Empty format is legal */
436 /* In this state, the next thing has to be a format item. */
459 /* Signed integer can only precede a P format. */
463 error
= "Expected P edit descriptor";
470 /* P requires a prior number. */
471 error
= "P descriptor requires leading scale factor";
475 /* X requires a prior number if we're being pedantic. */
476 if (gfc_notify_std (GFC_STD_GNU
, "Extension: X descriptor "
477 "requires leading space count at %C")
487 goto extension_optional_comma
;
495 if (t
!= FMT_RPAREN
|| level
> 0)
497 error
= "$ must the last specifier";
518 error
= unexpected_end
;
522 error
= unexpected_element
;
527 /* In this state, t must currently be a data descriptor.
528 Deal with things that can/must follow the descriptor. */
542 error
= "Repeat count cannot follow P descriptor";
557 error
= posint_required
;
573 error
= posint_required
;
580 error
= period_required
;
585 if (u
!= FMT_ZERO
&& u
!= FMT_POSINT
)
587 error
= nonneg_required
;
594 /* Look for optional exponent. */
605 error
= "Positive exponent width required";
614 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
616 error
= nonneg_required
;
623 error
= period_required
;
628 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
630 error
= nonneg_required
;
637 if(mode
== MODE_STRING
)
639 format_string
+= value
;
640 format_length
-= value
;
654 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
656 error
= nonneg_required
;
668 if (t
!= FMT_ZERO
&& t
!= FMT_POSINT
)
670 error
= nonneg_required
;
678 error
= unexpected_element
;
683 /* Between a descriptor and what comes next. */
702 error
= unexpected_end
;
706 error
= "Missing comma";
711 /* Optional comma is a weird between state where we've just finished
712 reading a colon, slash or P descriptor. */
726 /* Assume that we have another format item. */
733 extension_optional_comma
:
734 /* As a GNU extension, permit a missing comma after a string literal. */
752 error
= unexpected_end
;
756 if (gfc_notify_std (GFC_STD_GNU
, "Extension: Missing comma at %C")
766 /* Something went wrong. If the format we're checking is a string,
767 generate a warning, since the program is correct. If the format
768 is in a FORMAT statement, this messes up parsing, which is an
770 if (mode
!= MODE_STRING
)
771 gfc_error ("%s in format string at %C", error
);
774 gfc_warning ("%s in format string at %C", error
);
776 /* TODO: More elaborate measures are needed to show where a problem
777 is within a format string that has been calculated. */
787 /* Given an expression node that is a constant string, see if it looks
788 like a format string. */
791 check_format_string (gfc_expr
* e
)
795 format_string
= e
->value
.character
.string
;
800 /************ Fortran 95 I/O statement matchers *************/
802 /* Match a FORMAT statement. This amounts to actually parsing the
803 format descriptors in order to correctly locate the end of the
807 gfc_match_format (void)
812 if (gfc_statement_label
== NULL
)
814 gfc_error ("Missing format label at %C");
817 gfc_gobble_whitespace ();
822 start
= gfc_current_locus
;
824 if (check_format () == FAILURE
)
827 if (gfc_match_eos () != MATCH_YES
)
829 gfc_syntax_error (ST_FORMAT
);
833 /* The label doesn't get created until after the statement is done
834 being matched, so we have to leave the string for later. */
836 gfc_current_locus
= start
; /* Back to the beginning */
839 new_st
.op
= EXEC_NOP
;
842 e
->expr_type
= EXPR_CONSTANT
;
843 e
->ts
.type
= BT_CHARACTER
;
844 e
->ts
.kind
= gfc_default_character_kind();
846 e
->value
.character
.string
= format_string
= gfc_getmem(format_length
+1);
847 e
->value
.character
.length
= format_length
;
848 gfc_statement_label
->format
= e
;
851 check_format (); /* Guaranteed to succeed */
852 gfc_match_eos (); /* Guaranteed to succeed */
858 /* Match an expression I/O tag of some sort. */
861 match_etag (const io_tag
* tag
, gfc_expr
** v
)
866 m
= gfc_match (tag
->spec
, &result
);
872 gfc_error ("Duplicate %s specification at %C", tag
->name
);
873 gfc_free_expr (result
);
882 /* Match a variable I/O tag of some sort. */
885 match_vtag (const io_tag
* tag
, gfc_expr
** v
)
890 m
= gfc_match (tag
->spec
, &result
);
896 gfc_error ("Duplicate %s specification at %C", tag
->name
);
897 gfc_free_expr (result
);
901 if (result
->symtree
->n
.sym
->attr
.intent
== INTENT_IN
)
903 gfc_error ("Variable tag cannot be INTENT(IN) at %C");
904 gfc_free_expr (result
);
908 if (gfc_pure (NULL
) && gfc_impure_variable (result
->symtree
->n
.sym
))
910 gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
911 gfc_free_expr (result
);
920 /* Match a label I/O tag. */
923 match_ltag (const io_tag
* tag
, gfc_st_label
** label
)
929 m
= gfc_match (tag
->spec
, label
);
930 if (m
== MATCH_YES
&& old
!= 0)
932 gfc_error ("Duplicate %s label specification at %C", tag
->name
);
940 /* Do expression resolution and type-checking on an expression tag. */
943 resolve_tag (const io_tag
* tag
, gfc_expr
* e
)
949 if (gfc_resolve_expr (e
) == FAILURE
)
952 if (e
->ts
.type
!= tag
->type
)
954 /* Format label can be integer varibale. */
955 if (tag
!= &tag_format
)
957 gfc_error ("%s tag at %L must be of type %s", tag
->name
, &e
->where
,
958 gfc_basic_typename (tag
->type
));
963 if (tag
== &tag_format
)
965 if (e
->rank
!= 1 && e
->rank
!= 0)
967 gfc_error ("FORMAT tag at %L cannot be array of strings",
976 gfc_error ("%s tag at %L must be scalar", tag
->name
, &e
->where
);
985 /* Match a single tag of an OPEN statement. */
988 match_open_element (gfc_open
* open
)
992 m
= match_etag (&tag_unit
, &open
->unit
);
995 m
= match_vtag (&tag_iostat
, &open
->iostat
);
998 m
= match_etag (&tag_file
, &open
->file
);
1001 m
= match_etag (&tag_status
, &open
->status
);
1004 m
= match_etag (&tag_e_access
, &open
->access
);
1007 m
= match_etag (&tag_e_form
, &open
->form
);
1010 m
= match_etag (&tag_e_recl
, &open
->recl
);
1013 m
= match_etag (&tag_e_blank
, &open
->blank
);
1016 m
= match_etag (&tag_e_position
, &open
->position
);
1019 m
= match_etag (&tag_e_action
, &open
->action
);
1022 m
= match_etag (&tag_e_delim
, &open
->delim
);
1025 m
= match_etag (&tag_e_pad
, &open
->pad
);
1028 m
= match_ltag (&tag_err
, &open
->err
);
1036 /* Free the gfc_open structure and all the expressions it contains. */
1039 gfc_free_open (gfc_open
* open
)
1045 gfc_free_expr (open
->unit
);
1046 gfc_free_expr (open
->iostat
);
1047 gfc_free_expr (open
->file
);
1048 gfc_free_expr (open
->status
);
1049 gfc_free_expr (open
->access
);
1050 gfc_free_expr (open
->form
);
1051 gfc_free_expr (open
->recl
);
1052 gfc_free_expr (open
->blank
);
1053 gfc_free_expr (open
->position
);
1054 gfc_free_expr (open
->action
);
1055 gfc_free_expr (open
->delim
);
1056 gfc_free_expr (open
->pad
);
1062 /* Resolve everything in a gfc_open structure. */
1065 gfc_resolve_open (gfc_open
* open
)
1068 RESOLVE_TAG (&tag_unit
, open
->unit
);
1069 RESOLVE_TAG (&tag_iostat
, open
->iostat
);
1070 RESOLVE_TAG (&tag_file
, open
->file
);
1071 RESOLVE_TAG (&tag_status
, open
->status
);
1072 RESOLVE_TAG (&tag_e_form
, open
->form
);
1073 RESOLVE_TAG (&tag_e_recl
, open
->recl
);
1075 RESOLVE_TAG (&tag_e_blank
, open
->blank
);
1076 RESOLVE_TAG (&tag_e_position
, open
->position
);
1077 RESOLVE_TAG (&tag_e_action
, open
->action
);
1078 RESOLVE_TAG (&tag_e_delim
, open
->delim
);
1079 RESOLVE_TAG (&tag_e_pad
, open
->pad
);
1081 if (gfc_reference_st_label (open
->err
, ST_LABEL_TARGET
) == FAILURE
)
1088 /* Match an OPEN statmement. */
1091 gfc_match_open (void)
1096 m
= gfc_match_char ('(');
1100 open
= gfc_getmem (sizeof (gfc_open
));
1102 m
= match_open_element (open
);
1104 if (m
== MATCH_ERROR
)
1108 m
= gfc_match_expr (&open
->unit
);
1111 if (m
== MATCH_ERROR
)
1117 if (gfc_match_char (')') == MATCH_YES
)
1119 if (gfc_match_char (',') != MATCH_YES
)
1122 m
= match_open_element (open
);
1123 if (m
== MATCH_ERROR
)
1129 if (gfc_match_eos () == MATCH_NO
)
1132 if (gfc_pure (NULL
))
1134 gfc_error ("OPEN statement not allowed in PURE procedure at %C");
1138 new_st
.op
= EXEC_OPEN
;
1139 new_st
.ext
.open
= open
;
1143 gfc_syntax_error (ST_OPEN
);
1146 gfc_free_open (open
);
1151 /* Free a gfc_close structure an all its expressions. */
1154 gfc_free_close (gfc_close
* close
)
1160 gfc_free_expr (close
->unit
);
1161 gfc_free_expr (close
->iostat
);
1162 gfc_free_expr (close
->status
);
1168 /* Match elements of a CLOSE statment. */
1171 match_close_element (gfc_close
* close
)
1175 m
= match_etag (&tag_unit
, &close
->unit
);
1178 m
= match_etag (&tag_status
, &close
->status
);
1181 m
= match_vtag (&tag_iostat
, &close
->iostat
);
1184 m
= match_ltag (&tag_err
, &close
->err
);
1192 /* Match a CLOSE statement. */
1195 gfc_match_close (void)
1200 m
= gfc_match_char ('(');
1204 close
= gfc_getmem (sizeof (gfc_close
));
1206 m
= match_close_element (close
);
1208 if (m
== MATCH_ERROR
)
1212 m
= gfc_match_expr (&close
->unit
);
1215 if (m
== MATCH_ERROR
)
1221 if (gfc_match_char (')') == MATCH_YES
)
1223 if (gfc_match_char (',') != MATCH_YES
)
1226 m
= match_close_element (close
);
1227 if (m
== MATCH_ERROR
)
1233 if (gfc_match_eos () == MATCH_NO
)
1236 if (gfc_pure (NULL
))
1238 gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
1242 new_st
.op
= EXEC_CLOSE
;
1243 new_st
.ext
.close
= close
;
1247 gfc_syntax_error (ST_CLOSE
);
1250 gfc_free_close (close
);
1255 /* Resolve everything in a gfc_close structure. */
1258 gfc_resolve_close (gfc_close
* close
)
1261 RESOLVE_TAG (&tag_unit
, close
->unit
);
1262 RESOLVE_TAG (&tag_iostat
, close
->iostat
);
1263 RESOLVE_TAG (&tag_status
, close
->status
);
1265 if (gfc_reference_st_label (close
->err
, ST_LABEL_TARGET
) == FAILURE
)
1272 /* Free a gfc_filepos structure. */
1275 gfc_free_filepos (gfc_filepos
* fp
)
1278 gfc_free_expr (fp
->unit
);
1279 gfc_free_expr (fp
->iostat
);
1284 /* Match elements of a REWIND, BACKSPACE or ENDFILE statement. */
1287 match_file_element (gfc_filepos
* fp
)
1291 m
= match_etag (&tag_unit
, &fp
->unit
);
1294 m
= match_vtag (&tag_iostat
, &fp
->iostat
);
1297 m
= match_ltag (&tag_err
, &fp
->err
);
1305 /* Match the second half of the file-positioning statements, REWIND,
1306 BACKSPACE or ENDFILE. */
1309 match_filepos (gfc_statement st
, gfc_exec_op op
)
1314 fp
= gfc_getmem (sizeof (gfc_filepos
));
1316 if (gfc_match_char ('(') == MATCH_NO
)
1318 m
= gfc_match_expr (&fp
->unit
);
1319 if (m
== MATCH_ERROR
)
1327 m
= match_file_element (fp
);
1328 if (m
== MATCH_ERROR
)
1332 m
= gfc_match_expr (&fp
->unit
);
1333 if (m
== MATCH_ERROR
)
1341 if (gfc_match_char (')') == MATCH_YES
)
1343 if (gfc_match_char (',') != MATCH_YES
)
1346 m
= match_file_element (fp
);
1347 if (m
== MATCH_ERROR
)
1354 if (gfc_match_eos () != MATCH_YES
)
1357 if (gfc_pure (NULL
))
1359 gfc_error ("%s statement not allowed in PURE procedure at %C",
1360 gfc_ascii_statement (st
));
1366 new_st
.ext
.filepos
= fp
;
1370 gfc_syntax_error (st
);
1373 gfc_free_filepos (fp
);
1379 gfc_resolve_filepos (gfc_filepos
* fp
)
1382 RESOLVE_TAG (&tag_unit
, fp
->unit
);
1383 if (gfc_reference_st_label (fp
->err
, ST_LABEL_TARGET
) == FAILURE
)
1390 /* Match the file positioning statements: ENDFILE, BACKSPACE or
1394 gfc_match_endfile (void)
1397 return match_filepos (ST_END_FILE
, EXEC_ENDFILE
);
1401 gfc_match_backspace (void)
1404 return match_filepos (ST_BACKSPACE
, EXEC_BACKSPACE
);
1408 gfc_match_rewind (void)
1411 return match_filepos (ST_REWIND
, EXEC_REWIND
);
1415 /******************** Data Transfer Statments *********************/
1418 { M_READ
, M_WRITE
, M_PRINT
, M_INQUIRE
}
1422 /* Return a default unit number. */
1425 default_unit (io_kind k
)
1434 return gfc_int_expr (unit
);
1438 /* Match a unit specification for a data transfer statement. */
1441 match_dt_unit (io_kind k
, gfc_dt
* dt
)
1445 if (gfc_match_char ('*') == MATCH_YES
)
1447 if (dt
->io_unit
!= NULL
)
1450 dt
->io_unit
= default_unit (k
);
1454 if (gfc_match_expr (&e
) == MATCH_YES
)
1456 if (dt
->io_unit
!= NULL
)
1469 gfc_error ("Duplicate UNIT specification at %C");
1474 /* Match a format specification. */
1477 match_dt_format (gfc_dt
* dt
)
1481 gfc_st_label
*label
;
1483 where
= gfc_current_locus
;
1485 if (gfc_match_char ('*') == MATCH_YES
)
1487 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
1490 dt
->format_label
= &format_asterisk
;
1494 if (gfc_match_st_label (&label
, 0) == MATCH_YES
)
1496 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
1498 gfc_free_st_label (label
);
1502 if (gfc_reference_st_label (label
, ST_LABEL_FORMAT
) == FAILURE
)
1505 dt
->format_label
= label
;
1509 if (gfc_match_expr (&e
) == MATCH_YES
)
1511 if (dt
->format_expr
!= NULL
|| dt
->format_label
!= NULL
)
1516 if (e
->ts
.type
== BT_INTEGER
&& e
->rank
== 0)
1517 e
->symtree
->n
.sym
->attr
.assign
= 1;
1519 dt
->format_expr
= e
;
1523 gfc_current_locus
= where
; /* The only case where we have to restore */
1528 gfc_error ("Duplicate format specification at %C");
1533 /* Traverse a namelist that is part of a READ statement to make sure
1534 that none of the variables in the namelist are INTENT(IN). Returns
1535 nonzero if we find such a variable. */
1538 check_namelist (gfc_symbol
* sym
)
1542 for (p
= sym
->namelist
; p
; p
= p
->next
)
1543 if (p
->sym
->attr
.intent
== INTENT_IN
)
1545 gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
1546 p
->sym
->name
, sym
->name
);
1554 /* Match a single data transfer element. */
1557 match_dt_element (io_kind k
, gfc_dt
* dt
)
1559 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
1563 if (gfc_match (" unit =") == MATCH_YES
)
1565 m
= match_dt_unit (k
, dt
);
1570 if (gfc_match (" fmt =") == MATCH_YES
)
1572 m
= match_dt_format (dt
);
1577 if (gfc_match (" nml = %n", name
) == MATCH_YES
)
1579 if (dt
->namelist
!= NULL
)
1581 gfc_error ("Duplicate NML specification at %C");
1585 if (gfc_find_symbol (name
, NULL
, 1, &sym
))
1588 if (sym
== NULL
|| sym
->attr
.flavor
!= FL_NAMELIST
)
1590 gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
1591 sym
!= NULL
? sym
->name
: name
);
1596 if (k
== M_READ
&& check_namelist (sym
))
1602 m
= match_etag (&tag_rec
, &dt
->rec
);
1605 m
= match_vtag (&tag_iostat
, &dt
->iostat
);
1608 m
= match_ltag (&tag_err
, &dt
->err
);
1611 m
= match_etag (&tag_advance
, &dt
->advance
);
1614 m
= match_vtag (&tag_size
, &dt
->size
);
1618 m
= match_ltag (&tag_end
, &dt
->end
);
1620 dt
->end_where
= gfc_current_locus
;
1624 m
= match_ltag (&tag_eor
, &dt
->eor
);
1626 dt
->eor_where
= gfc_current_locus
;
1634 /* Free a data transfer structure and everything below it. */
1637 gfc_free_dt (gfc_dt
* dt
)
1643 gfc_free_expr (dt
->io_unit
);
1644 gfc_free_expr (dt
->format_expr
);
1645 gfc_free_expr (dt
->rec
);
1646 gfc_free_expr (dt
->advance
);
1647 gfc_free_expr (dt
->iostat
);
1648 gfc_free_expr (dt
->size
);
1654 /* Resolve everything in a gfc_dt structure. */
1657 gfc_resolve_dt (gfc_dt
* dt
)
1661 RESOLVE_TAG (&tag_format
, dt
->format_expr
);
1662 RESOLVE_TAG (&tag_rec
, dt
->rec
);
1663 RESOLVE_TAG (&tag_advance
, dt
->advance
);
1664 RESOLVE_TAG (&tag_iostat
, dt
->iostat
);
1665 RESOLVE_TAG (&tag_size
, dt
->size
);
1668 if (gfc_resolve_expr (e
) == SUCCESS
1669 && (e
->ts
.type
!= BT_INTEGER
1670 && (e
->ts
.type
!= BT_CHARACTER
1671 || e
->expr_type
!= EXPR_VARIABLE
)))
1674 ("UNIT specification at %L must be an INTEGER expression or a "
1675 "CHARACTER variable", &e
->where
);
1679 /* Sanity checks on data transfer statements. */
1680 if (e
->ts
.type
== BT_CHARACTER
)
1682 if (dt
->rec
!= NULL
)
1684 gfc_error ("REC tag at %L is incompatible with internal file",
1689 if (dt
->namelist
!= NULL
)
1691 gfc_error ("Internal file at %L is incompatible with namelist",
1692 &dt
->io_unit
->where
);
1696 if (dt
->advance
!= NULL
)
1698 gfc_error ("ADVANCE tag at %L is incompatible with internal file",
1699 &dt
->advance
->where
);
1704 if (dt
->rec
!= NULL
)
1706 if (dt
->end
!= NULL
)
1708 gfc_error ("REC tag at %L is incompatible with END tag",
1713 if (dt
->format_label
== &format_asterisk
)
1716 ("END tag at %L is incompatible with list directed format (*)",
1721 if (dt
->namelist
!= NULL
)
1723 gfc_error ("REC tag at %L is incompatible with namelist",
1729 if (dt
->advance
!= NULL
&& dt
->format_label
== &format_asterisk
)
1731 gfc_error ("ADVANCE tag at %L is incompatible with list directed "
1732 "format (*)", &dt
->advance
->where
);
1736 if (dt
->eor
!= 0 && dt
->advance
== NULL
)
1738 gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt
->eor_where
);
1742 if (dt
->size
!= NULL
&& dt
->advance
== NULL
)
1744 gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt
->size
->where
);
1748 /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string
1751 if (gfc_reference_st_label (dt
->err
, ST_LABEL_TARGET
) == FAILURE
)
1754 if (gfc_reference_st_label (dt
->end
, ST_LABEL_TARGET
) == FAILURE
)
1757 if (gfc_reference_st_label (dt
->eor
, ST_LABEL_TARGET
) == FAILURE
)
1760 /* Check the format label ectually exists. */
1761 if (dt
->format_label
&& dt
->format_label
!= &format_asterisk
1762 && dt
->format_label
->defined
== ST_LABEL_UNKNOWN
)
1764 gfc_error ("FORMAT label %d at %L not defined", dt
->format_label
->value
,
1765 &dt
->format_label
->where
);
1772 /* Given an io_kind, return its name. */
1775 io_kind_name (io_kind k
)
1794 gfc_internal_error ("io_kind_name(): bad I/O-kind");
1801 /* Match an IO iteration statement of the form:
1803 ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
1805 which is equivalent to a single IO element. This function is
1806 mutually recursive with match_io_element(). */
1808 static match
match_io_element (io_kind k
, gfc_code
**);
1811 match_io_iterator (io_kind k
, gfc_code
** result
)
1813 gfc_code
*head
, *tail
, *new;
1821 old_loc
= gfc_current_locus
;
1823 if (gfc_match_char ('(') != MATCH_YES
)
1826 m
= match_io_element (k
, &head
);
1829 if (m
!= MATCH_YES
|| gfc_match_char (',') != MATCH_YES
)
1835 /* Can't be anything but an IO iterator. Build a list. */
1836 iter
= gfc_get_iterator ();
1840 m
= gfc_match_iterator (iter
, 0);
1841 if (m
== MATCH_ERROR
)
1846 m
= match_io_element (k
, &new);
1847 if (m
== MATCH_ERROR
)
1856 tail
= gfc_append_code (tail
, new);
1858 if (gfc_match_char (',') != MATCH_YES
)
1867 if (gfc_match_char (')') != MATCH_YES
)
1870 new = gfc_get_code ();
1872 new->ext
.iterator
= iter
;
1874 new->block
= gfc_get_code ();
1875 new->block
->op
= EXEC_DO
;
1876 new->block
->next
= head
;
1882 gfc_error ("Syntax error in I/O iterator at %C");
1886 gfc_free_iterator (iter
, 1);
1887 gfc_free_statements (head
);
1888 gfc_current_locus
= old_loc
;
1893 /* Match a single element of an IO list, which is either a single
1894 expression or an IO Iterator. */
1897 match_io_element (io_kind k
, gfc_code
** cpp
)
1905 m
= match_io_iterator (k
, cpp
);
1911 m
= gfc_match_variable (&expr
, 0);
1913 gfc_error ("Expected variable in READ statement at %C");
1917 m
= gfc_match_expr (&expr
);
1919 gfc_error ("Expected expression in %s statement at %C",
1927 if (expr
->symtree
->n
.sym
->attr
.intent
== INTENT_IN
)
1930 ("Variable '%s' in input list at %C cannot be INTENT(IN)",
1931 expr
->symtree
->n
.sym
->name
);
1936 && gfc_impure_variable (expr
->symtree
->n
.sym
)
1937 && current_dt
->io_unit
->ts
.type
== BT_CHARACTER
)
1939 gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
1940 expr
->symtree
->n
.sym
->name
);
1947 if (current_dt
->io_unit
->ts
.type
== BT_CHARACTER
1949 && current_dt
->io_unit
->expr_type
== EXPR_VARIABLE
1950 && gfc_impure_variable (current_dt
->io_unit
->symtree
->n
.sym
))
1953 ("Cannot write to internal file unit '%s' at %C inside a "
1954 "PURE procedure", current_dt
->io_unit
->symtree
->n
.sym
->name
);
1966 gfc_free_expr (expr
);
1970 cp
= gfc_get_code ();
1971 cp
->op
= EXEC_TRANSFER
;
1979 /* Match an I/O list, building gfc_code structures as we go. */
1982 match_io_list (io_kind k
, gfc_code
** head_p
)
1984 gfc_code
*head
, *tail
, *new;
1987 *head_p
= head
= tail
= NULL
;
1988 if (gfc_match_eos () == MATCH_YES
)
1993 m
= match_io_element (k
, &new);
1994 if (m
== MATCH_ERROR
)
1999 tail
= gfc_append_code (tail
, new);
2003 if (gfc_match_eos () == MATCH_YES
)
2005 if (gfc_match_char (',') != MATCH_YES
)
2013 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k
));
2016 gfc_free_statements (head
);
2021 /* Attach the data transfer end node. */
2024 terminate_io (gfc_code
* io_code
)
2028 if (io_code
== NULL
)
2031 c
= gfc_get_code ();
2032 c
->op
= EXEC_DT_END
;
2034 /* Point to structure that is already there */
2035 c
->ext
.dt
= new_st
.ext
.dt
;
2036 gfc_append_code (io_code
, c
);
2040 /* Match a READ, WRITE or PRINT statement. */
2043 match_io (io_kind k
)
2045 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
2055 current_dt
= dt
= gfc_getmem (sizeof (gfc_dt
));
2057 if (gfc_match_char ('(') == MATCH_NO
)
2062 m
= match_dt_format (dt
);
2063 if (m
== MATCH_ERROR
)
2069 dt
->io_unit
= default_unit (k
);
2073 /* Match a control list */
2074 if (match_dt_element (k
, dt
) == MATCH_YES
)
2076 if (match_dt_unit (k
, dt
) != MATCH_YES
)
2079 if (gfc_match_char (')') == MATCH_YES
)
2081 if (gfc_match_char (',') != MATCH_YES
)
2084 m
= match_dt_element (k
, dt
);
2087 if (m
== MATCH_ERROR
)
2090 m
= match_dt_format (dt
);
2093 if (m
== MATCH_ERROR
)
2096 where
= gfc_current_locus
;
2098 if (gfc_match_name (name
) == MATCH_YES
2099 && !gfc_find_symbol (name
, NULL
, 1, &sym
)
2100 && sym
->attr
.flavor
== FL_NAMELIST
)
2103 if (k
== M_READ
&& check_namelist (sym
))
2111 gfc_current_locus
= where
;
2113 goto loop
; /* No matches, try regular elements */
2116 if (gfc_match_char (')') == MATCH_YES
)
2118 if (gfc_match_char (',') != MATCH_YES
)
2124 m
= match_dt_element (k
, dt
);
2127 if (m
== MATCH_ERROR
)
2130 if (gfc_match_char (')') == MATCH_YES
)
2132 if (gfc_match_char (',') != MATCH_YES
)
2137 /* Optional leading comma (non-standard). */
2139 gfc_match_char (',');
2142 if (gfc_match_eos () != MATCH_YES
)
2144 if (comma_flag
&& gfc_match_char (',') != MATCH_YES
)
2146 gfc_error ("Expected comma in I/O list at %C");
2151 m
= match_io_list (k
, &io_code
);
2152 if (m
== MATCH_ERROR
)
2158 /* A full IO statement has been matched. */
2159 if (dt
->io_unit
->expr_type
== EXPR_VARIABLE
2161 && dt
->io_unit
->ts
.type
== BT_CHARACTER
2162 && dt
->io_unit
->symtree
->n
.sym
->attr
.intent
== INTENT_IN
)
2164 gfc_error ("Internal file '%s' at %L is INTENT(IN)",
2165 dt
->io_unit
->symtree
->n
.sym
->name
, &dt
->io_unit
->where
);
2170 expr
= dt
->format_expr
;
2172 if (expr
!= NULL
&& expr
->expr_type
== EXPR_CONSTANT
)
2173 check_format_string (expr
);
2176 && (k
== M_READ
|| k
== M_WRITE
)
2177 && dt
->io_unit
->ts
.type
!= BT_CHARACTER
)
2180 ("io-unit in %s statement at %C must be an internal file in a "
2181 "PURE procedure", io_kind_name (k
));
2186 new_st
.op
= (k
== M_READ
) ? EXEC_READ
: EXEC_WRITE
;
2188 new_st
.next
= io_code
;
2190 terminate_io (io_code
);
2195 gfc_error ("Syntax error in %s statement at %C", io_kind_name (k
));
2205 gfc_match_read (void)
2207 return match_io (M_READ
);
2211 gfc_match_write (void)
2213 return match_io (M_WRITE
);
2217 gfc_match_print (void)
2221 m
= match_io (M_PRINT
);
2225 if (gfc_pure (NULL
))
2227 gfc_error ("PRINT statement at %C not allowed within PURE procedure");
2235 /* Free a gfc_inquire structure. */
2238 gfc_free_inquire (gfc_inquire
* inquire
)
2241 if (inquire
== NULL
)
2244 gfc_free_expr (inquire
->unit
);
2245 gfc_free_expr (inquire
->file
);
2246 gfc_free_expr (inquire
->iostat
);
2247 gfc_free_expr (inquire
->exist
);
2248 gfc_free_expr (inquire
->opened
);
2249 gfc_free_expr (inquire
->number
);
2250 gfc_free_expr (inquire
->named
);
2251 gfc_free_expr (inquire
->name
);
2252 gfc_free_expr (inquire
->access
);
2253 gfc_free_expr (inquire
->sequential
);
2254 gfc_free_expr (inquire
->direct
);
2255 gfc_free_expr (inquire
->form
);
2256 gfc_free_expr (inquire
->formatted
);
2257 gfc_free_expr (inquire
->unformatted
);
2258 gfc_free_expr (inquire
->recl
);
2259 gfc_free_expr (inquire
->nextrec
);
2260 gfc_free_expr (inquire
->blank
);
2261 gfc_free_expr (inquire
->position
);
2262 gfc_free_expr (inquire
->action
);
2263 gfc_free_expr (inquire
->read
);
2264 gfc_free_expr (inquire
->write
);
2265 gfc_free_expr (inquire
->readwrite
);
2266 gfc_free_expr (inquire
->delim
);
2267 gfc_free_expr (inquire
->pad
);
2268 gfc_free_expr (inquire
->iolength
);
2274 /* Match an element of an INQUIRE statement. */
2276 #define RETM if (m != MATCH_NO) return m;
2279 match_inquire_element (gfc_inquire
* inquire
)
2283 m
= match_etag (&tag_unit
, &inquire
->unit
);
2284 RETM m
= match_etag (&tag_file
, &inquire
->file
);
2285 RETM m
= match_ltag (&tag_err
, &inquire
->err
);
2286 RETM m
= match_vtag (&tag_iostat
, &inquire
->iostat
);
2287 RETM m
= match_vtag (&tag_exist
, &inquire
->exist
);
2288 RETM m
= match_vtag (&tag_opened
, &inquire
->opened
);
2289 RETM m
= match_vtag (&tag_named
, &inquire
->named
);
2290 RETM m
= match_vtag (&tag_name
, &inquire
->name
);
2291 RETM m
= match_vtag (&tag_number
, &inquire
->number
);
2292 RETM m
= match_vtag (&tag_s_access
, &inquire
->access
);
2293 RETM m
= match_vtag (&tag_sequential
, &inquire
->sequential
);
2294 RETM m
= match_vtag (&tag_direct
, &inquire
->direct
);
2295 RETM m
= match_vtag (&tag_s_form
, &inquire
->form
);
2296 RETM m
= match_vtag (&tag_formatted
, &inquire
->formatted
);
2297 RETM m
= match_vtag (&tag_unformatted
, &inquire
->unformatted
);
2298 RETM m
= match_vtag (&tag_s_recl
, &inquire
->recl
);
2299 RETM m
= match_vtag (&tag_nextrec
, &inquire
->nextrec
);
2300 RETM m
= match_vtag (&tag_s_blank
, &inquire
->blank
);
2301 RETM m
= match_vtag (&tag_s_position
, &inquire
->position
);
2302 RETM m
= match_vtag (&tag_s_action
, &inquire
->action
);
2303 RETM m
= match_vtag (&tag_read
, &inquire
->read
);
2304 RETM m
= match_vtag (&tag_write
, &inquire
->write
);
2305 RETM m
= match_vtag (&tag_readwrite
, &inquire
->readwrite
);
2306 RETM m
= match_vtag (&tag_s_delim
, &inquire
->delim
);
2307 RETM m
= match_vtag (&tag_s_pad
, &inquire
->pad
);
2308 RETM m
= match_vtag (&tag_iolength
, &inquire
->iolength
);
2309 RETM
return MATCH_NO
;
2316 gfc_match_inquire (void)
2318 gfc_inquire
*inquire
;
2322 m
= gfc_match_char ('(');
2326 inquire
= gfc_getmem (sizeof (gfc_inquire
));
2328 m
= match_inquire_element (inquire
);
2329 if (m
== MATCH_ERROR
)
2333 m
= gfc_match_expr (&inquire
->unit
);
2334 if (m
== MATCH_ERROR
)
2340 /* See if we have the IOLENGTH form of the inquire statement. */
2341 if (inquire
->iolength
!= NULL
)
2343 if (gfc_match_char (')') != MATCH_YES
)
2346 m
= match_io_list (M_INQUIRE
, &code
);
2347 if (m
== MATCH_ERROR
)
2352 terminate_io (code
);
2354 new_st
.op
= EXEC_IOLENGTH
;
2355 new_st
.expr
= inquire
->iolength
;
2358 if (gfc_pure (NULL
))
2360 gfc_free_statements (code
);
2361 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2369 /* At this point, we have the non-IOLENGTH inquire statement. */
2372 if (gfc_match_char (')') == MATCH_YES
)
2374 if (gfc_match_char (',') != MATCH_YES
)
2377 m
= match_inquire_element (inquire
);
2378 if (m
== MATCH_ERROR
)
2383 if (inquire
->iolength
!= NULL
)
2385 gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
2390 if (gfc_match_eos () != MATCH_YES
)
2393 if (gfc_pure (NULL
))
2395 gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
2399 new_st
.op
= EXEC_INQUIRE
;
2400 new_st
.ext
.inquire
= inquire
;
2404 gfc_syntax_error (ST_INQUIRE
);
2407 gfc_free_inquire (inquire
);
2412 /* Resolve everything in a gfc_inquire structure. */
2415 gfc_resolve_inquire (gfc_inquire
* inquire
)
2418 RESOLVE_TAG (&tag_unit
, inquire
->unit
);
2419 RESOLVE_TAG (&tag_file
, inquire
->file
);
2420 RESOLVE_TAG (&tag_iostat
, inquire
->iostat
);
2421 RESOLVE_TAG (&tag_exist
, inquire
->exist
);
2422 RESOLVE_TAG (&tag_opened
, inquire
->opened
);
2423 RESOLVE_TAG (&tag_number
, inquire
->number
);
2424 RESOLVE_TAG (&tag_named
, inquire
->named
);
2425 RESOLVE_TAG (&tag_name
, inquire
->name
);
2426 RESOLVE_TAG (&tag_s_access
, inquire
->access
);
2427 RESOLVE_TAG (&tag_sequential
, inquire
->sequential
);
2428 RESOLVE_TAG (&tag_direct
, inquire
->direct
);
2429 RESOLVE_TAG (&tag_s_form
, inquire
->form
);
2430 RESOLVE_TAG (&tag_formatted
, inquire
->formatted
);
2431 RESOLVE_TAG (&tag_unformatted
, inquire
->unformatted
);
2432 RESOLVE_TAG (&tag_s_recl
, inquire
->recl
);
2433 RESOLVE_TAG (&tag_nextrec
, inquire
->nextrec
);
2434 RESOLVE_TAG (&tag_s_blank
, inquire
->blank
);
2435 RESOLVE_TAG (&tag_s_position
, inquire
->position
);
2436 RESOLVE_TAG (&tag_s_action
, inquire
->action
);
2437 RESOLVE_TAG (&tag_read
, inquire
->read
);
2438 RESOLVE_TAG (&tag_write
, inquire
->write
);
2439 RESOLVE_TAG (&tag_readwrite
, inquire
->readwrite
);
2440 RESOLVE_TAG (&tag_s_delim
, inquire
->delim
);
2441 RESOLVE_TAG (&tag_s_pad
, inquire
->pad
);
2443 if (gfc_reference_st_label (inquire
->err
, ST_LABEL_TARGET
) == FAILURE
)