Mercurial > hg > CbC > CbC_gcc
diff gcc/fortran/io.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/fortran/io.c Fri Oct 27 22:46:09 2017 +0900 @@ -0,0 +1,4742 @@ +/* Deal with I/O statements & related stuff. + Copyright (C) 2000-2017 Free Software Foundation, Inc. + Contributed by Andy Vaught + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "options.h" +#include "gfortran.h" +#include "match.h" +#include "parse.h" + +gfc_st_label +format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, + 0, {NULL, NULL}, NULL}; + +typedef struct +{ + const char *name, *spec, *value; + bt type; +} +io_tag; + +static const io_tag + tag_readonly = {"READONLY", " readonly", NULL, BT_UNKNOWN }, + tag_shared = {"SHARE", " shared", NULL, BT_UNKNOWN }, + tag_noshared = {"SHARE", " noshared", NULL, BT_UNKNOWN }, + tag_e_share = {"SHARE", " share =", " %e", BT_CHARACTER }, + tag_v_share = {"SHARE", " share =", " %v", BT_CHARACTER }, + tag_cc = {"CARRIAGECONTROL", " carriagecontrol =", " %e", + BT_CHARACTER }, + tag_v_cc = {"CARRIAGECONTROL", " carriagecontrol =", " %v", + BT_CHARACTER }, + tag_file = {"FILE", " file =", " %e", BT_CHARACTER }, + tag_status = {"STATUS", " status =", " %e", BT_CHARACTER}, + tag_e_access = {"ACCESS", " access =", " %e", BT_CHARACTER}, + tag_e_form = {"FORM", " form =", " %e", BT_CHARACTER}, + tag_e_recl = {"RECL", " recl =", " %e", BT_INTEGER}, + tag_e_blank = {"BLANK", " blank =", " %e", BT_CHARACTER}, + tag_e_position = {"POSITION", " position =", " %e", BT_CHARACTER}, + tag_e_action = {"ACTION", " action =", " %e", BT_CHARACTER}, + tag_e_delim = {"DELIM", " delim =", " %e", BT_CHARACTER}, + tag_e_pad = {"PAD", " pad =", " %e", BT_CHARACTER}, + tag_e_decimal = {"DECIMAL", " decimal =", " %e", BT_CHARACTER}, + tag_e_encoding = {"ENCODING", " encoding =", " %e", BT_CHARACTER}, + tag_e_async = {"ASYNCHRONOUS", " asynchronous =", " %e", BT_CHARACTER}, + tag_e_round = {"ROUND", " round =", " %e", BT_CHARACTER}, + tag_e_sign = {"SIGN", " sign =", " %e", BT_CHARACTER}, + tag_unit = {"UNIT", " unit =", " %e", BT_INTEGER}, + tag_advance = {"ADVANCE", " advance =", " %e", BT_CHARACTER}, + tag_rec = {"REC", " rec =", " %e", BT_INTEGER}, + tag_spos = {"POSITION", " pos =", " %e", BT_INTEGER}, + tag_format = {"FORMAT", NULL, NULL, BT_CHARACTER}, + tag_iomsg = {"IOMSG", " iomsg =", " %e", BT_CHARACTER}, + tag_iostat = {"IOSTAT", " iostat =", " %v", BT_INTEGER}, + tag_size = {"SIZE", " size =", " %v", BT_INTEGER}, + tag_exist = {"EXIST", " exist =", " %v", BT_LOGICAL}, + tag_opened = {"OPENED", " opened =", " %v", BT_LOGICAL}, + tag_named = {"NAMED", " named =", " %v", BT_LOGICAL}, + tag_name = {"NAME", " name =", " %v", BT_CHARACTER}, + tag_number = {"NUMBER", " number =", " %v", BT_INTEGER}, + tag_s_access = {"ACCESS", " access =", " %v", BT_CHARACTER}, + tag_sequential = {"SEQUENTIAL", " sequential =", " %v", BT_CHARACTER}, + tag_direct = {"DIRECT", " direct =", " %v", BT_CHARACTER}, + tag_s_form = {"FORM", " form =", " %v", BT_CHARACTER}, + tag_formatted = {"FORMATTED", " formatted =", " %v", BT_CHARACTER}, + tag_unformatted = {"UNFORMATTED", " unformatted =", " %v", BT_CHARACTER}, + tag_s_recl = {"RECL", " recl =", " %v", BT_INTEGER}, + tag_nextrec = {"NEXTREC", " nextrec =", " %v", BT_INTEGER}, + tag_s_blank = {"BLANK", " blank =", " %v", BT_CHARACTER}, + tag_s_position = {"POSITION", " position =", " %v", BT_CHARACTER}, + tag_s_action = {"ACTION", " action =", " %v", BT_CHARACTER}, + tag_read = {"READ", " read =", " %v", BT_CHARACTER}, + tag_write = {"WRITE", " write =", " %v", BT_CHARACTER}, + tag_readwrite = {"READWRITE", " readwrite =", " %v", BT_CHARACTER}, + tag_s_delim = {"DELIM", " delim =", " %v", BT_CHARACTER}, + tag_s_pad = {"PAD", " pad =", " %v", BT_CHARACTER}, + tag_s_decimal = {"DECIMAL", " decimal =", " %v", BT_CHARACTER}, + tag_s_encoding = {"ENCODING", " encoding =", " %v", BT_CHARACTER}, + tag_s_async = {"ASYNCHRONOUS", " asynchronous =", " %v", BT_CHARACTER}, + tag_s_round = {"ROUND", " round =", " %v", BT_CHARACTER}, + tag_s_sign = {"SIGN", " sign =", " %v", BT_CHARACTER}, + tag_iolength = {"IOLENGTH", " iolength =", " %v", BT_INTEGER}, + tag_convert = {"CONVERT", " convert =", " %e", BT_CHARACTER}, + tag_strm_out = {"POS", " pos =", " %v", BT_INTEGER}, + tag_err = {"ERR", " err =", " %l", BT_UNKNOWN}, + tag_end = {"END", " end =", " %l", BT_UNKNOWN}, + tag_eor = {"EOR", " eor =", " %l", BT_UNKNOWN}, + tag_id = {"ID", " id =", " %v", BT_INTEGER}, + tag_pending = {"PENDING", " pending =", " %v", BT_LOGICAL}, + tag_newunit = {"NEWUNIT", " newunit =", " %v", BT_INTEGER}, + tag_s_iqstream = {"STREAM", " stream =", " %v", BT_CHARACTER}; + +static gfc_dt *current_dt; + +#define RESOLVE_TAG(x, y) if (!resolve_tag (x, y)) return false; + +/* Are we currently processing an asynchronous I/O statement? */ + +bool async_io_dt; + +/**************** Fortran 95 FORMAT parser *****************/ + +/* FORMAT tokens returned by format_lex(). */ +enum format_token +{ + FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD, + FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_LPAREN, + FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F, + FMT_E, FMT_EN, FMT_ES, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END, + FMT_ERROR, FMT_DC, FMT_DP, FMT_T, FMT_TR, FMT_TL, FMT_STAR, FMT_RC, + FMT_RD, FMT_RN, FMT_RP, FMT_RU, FMT_RZ, FMT_DT +}; + +/* Local variables for checking format strings. The saved_token is + used to back up by a single format token during the parsing + process. */ +static gfc_char_t *format_string; +static int format_string_pos; +static int format_length, use_last_char; +static char error_element; +static locus format_locus; + +static format_token saved_token; + +static enum +{ MODE_STRING, MODE_FORMAT, MODE_COPY } +mode; + + +/* Return the next character in the format string. */ + +static char +next_char (gfc_instring in_string) +{ + static gfc_char_t c; + + if (use_last_char) + { + use_last_char = 0; + return c; + } + + format_length++; + + if (mode == MODE_STRING) + c = *format_string++; + else + { + c = gfc_next_char_literal (in_string); + if (c == '\n') + c = '\0'; + } + + if (flag_backslash && c == '\\') + { + locus old_locus = gfc_current_locus; + + if (gfc_match_special_char (&c) == MATCH_NO) + gfc_current_locus = old_locus; + + if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings) + gfc_warning (0, "Extension: backslash character at %C"); + } + + if (mode == MODE_COPY) + *format_string++ = c; + + if (mode != MODE_STRING) + format_locus = gfc_current_locus; + + format_string_pos++; + + c = gfc_wide_toupper (c); + return c; +} + + +/* Back up one character position. Only works once. */ + +static void +unget_char (void) +{ + use_last_char = 1; +} + +/* Eat up the spaces and return a character. */ + +static char +next_char_not_space () +{ + char c; + do + { + error_element = c = next_char (NONSTRING); + if (c == '\t') + gfc_warning (OPT_Wtabs, "Nonconforming tab character in format at %C"); + } + while (gfc_is_whitespace (c)); + return c; +} + +static int value = 0; + +/* Simple lexical analyzer for getting the next token in a FORMAT + statement. */ + +static format_token +format_lex (void) +{ + format_token token; + char c, delim; + int zflag; + int negative_flag; + + if (saved_token != FMT_NONE) + { + token = saved_token; + saved_token = FMT_NONE; + return token; + } + + c = next_char_not_space (); + + negative_flag = 0; + switch (c) + { + case '-': + negative_flag = 1; + /* Falls through. */ + + case '+': + c = next_char_not_space (); + if (!ISDIGIT (c)) + { + token = FMT_UNKNOWN; + break; + } + + value = c - '0'; + + do + { + c = next_char_not_space (); + if (ISDIGIT (c)) + value = 10 * value + c - '0'; + } + while (ISDIGIT (c)); + + unget_char (); + + if (negative_flag) + value = -value; + + token = FMT_SIGNED_INT; + break; + + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + zflag = (c == '0'); + + value = c - '0'; + + do + { + c = next_char_not_space (); + if (ISDIGIT (c)) + { + value = 10 * value + c - '0'; + if (c != '0') + zflag = 0; + } + } + while (ISDIGIT (c)); + + unget_char (); + token = zflag ? FMT_ZERO : FMT_POSINT; + break; + + case '.': + token = FMT_PERIOD; + break; + + case ',': + token = FMT_COMMA; + break; + + case ':': + token = FMT_COLON; + break; + + case '/': + token = FMT_SLASH; + break; + + case '$': + token = FMT_DOLLAR; + break; + + case 'T': + c = next_char_not_space (); + switch (c) + { + case 'L': + token = FMT_TL; + break; + case 'R': + token = FMT_TR; + break; + default: + token = FMT_T; + unget_char (); + } + break; + + case '(': + token = FMT_LPAREN; + break; + + case ')': + token = FMT_RPAREN; + break; + + case 'X': + token = FMT_X; + break; + + case 'S': + c = next_char_not_space (); + if (c != 'P' && c != 'S') + unget_char (); + + token = FMT_SIGN; + break; + + case 'B': + c = next_char_not_space (); + if (c == 'N' || c == 'Z') + token = FMT_BLANK; + else + { + unget_char (); + token = FMT_IBOZ; + } + + break; + + case '\'': + case '"': + delim = c; + + value = 0; + + for (;;) + { + c = next_char (INSTRING_WARN); + if (c == '\0') + { + token = FMT_END; + break; + } + + if (c == delim) + { + c = next_char (NONSTRING); + + if (c == '\0') + { + token = FMT_END; + break; + } + + if (c != delim) + { + unget_char (); + token = FMT_CHAR; + break; + } + } + value++; + } + break; + + case 'P': + token = FMT_P; + break; + + case 'I': + case 'O': + case 'Z': + token = FMT_IBOZ; + break; + + case 'F': + token = FMT_F; + break; + + case 'E': + c = next_char_not_space (); + if (c == 'N' ) + token = FMT_EN; + else if (c == 'S') + token = FMT_ES; + else + { + token = FMT_E; + unget_char (); + } + + break; + + case 'G': + token = FMT_G; + break; + + case 'H': + token = FMT_H; + break; + + case 'L': + token = FMT_L; + break; + + case 'A': + token = FMT_A; + break; + + case 'D': + c = next_char_not_space (); + if (c == 'P') + { + if (!gfc_notify_std (GFC_STD_F2003, "DP format " + "specifier not allowed at %C")) + return FMT_ERROR; + token = FMT_DP; + } + else if (c == 'C') + { + if (!gfc_notify_std (GFC_STD_F2003, "DC format " + "specifier not allowed at %C")) + return FMT_ERROR; + token = FMT_DC; + } + else if (c == 'T') + { + if (!gfc_notify_std (GFC_STD_F2003, "Fortran 2003: DT format " + "specifier not allowed at %C")) + return FMT_ERROR; + token = FMT_DT; + c = next_char_not_space (); + if (c == '\'' || c == '"') + { + delim = c; + value = 0; + + for (;;) + { + c = next_char (INSTRING_WARN); + if (c == '\0') + { + token = FMT_END; + break; + } + + if (c == delim) + { + c = next_char (NONSTRING); + if (c == '\0') + { + token = FMT_END; + break; + } + if (c == '/') + { + token = FMT_SLASH; + break; + } + if (c == delim) + continue; + unget_char (); + break; + } + } + } + else if (c == '/') + { + token = FMT_SLASH; + break; + } + else + unget_char (); + } + else + { + token = FMT_D; + unget_char (); + } + break; + + case 'R': + c = next_char_not_space (); + switch (c) + { + case 'C': + token = FMT_RC; + break; + case 'D': + token = FMT_RD; + break; + case 'N': + token = FMT_RN; + break; + case 'P': + token = FMT_RP; + break; + case 'U': + token = FMT_RU; + break; + case 'Z': + token = FMT_RZ; + break; + default: + token = FMT_UNKNOWN; + unget_char (); + break; + } + break; + + case '\0': + token = FMT_END; + break; + + case '*': + token = FMT_STAR; + break; + + default: + token = FMT_UNKNOWN; + break; + } + + return token; +} + + +static const char * +token_to_string (format_token t) +{ + switch (t) + { + case FMT_D: + return "D"; + case FMT_G: + return "G"; + case FMT_E: + return "E"; + case FMT_EN: + return "EN"; + case FMT_ES: + return "ES"; + default: + return ""; + } +} + +/* Check a format statement. The format string, either from a FORMAT + statement or a constant in an I/O statement has already been parsed + by itself, and we are checking it for validity. The dual origin + means that the warning message is a little less than great. */ + +static bool +check_format (bool is_input) +{ + const char *posint_required = _("Positive width required"); + const char *nonneg_required = _("Nonnegative width required"); + const char *unexpected_element = _("Unexpected element %qc in format " + "string at %L"); + const char *unexpected_end = _("Unexpected end of format string"); + const char *zero_width = _("Zero width in format descriptor"); + + const char *error = NULL; + format_token t, u; + int level; + int repeat; + bool rv; + + use_last_char = 0; + saved_token = FMT_NONE; + level = 0; + repeat = 0; + rv = true; + format_string_pos = 0; + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_LPAREN) + { + error = _("Missing leading left parenthesis"); + goto syntax; + } + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t == FMT_RPAREN) + goto finished; /* Empty format is legal */ + saved_token = t; + +format_item: + /* In this state, the next thing has to be a format item. */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; +format_item_1: + switch (t) + { + case FMT_STAR: + repeat = -1; + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t == FMT_LPAREN) + { + level++; + goto format_item; + } + error = _("Left parenthesis required after %<*%>"); + goto syntax; + + case FMT_POSINT: + repeat = value; + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t == FMT_LPAREN) + { + level++; + goto format_item; + } + + if (t == FMT_SLASH) + goto optional_comma; + + goto data_desc; + + case FMT_LPAREN: + level++; + goto format_item; + + case FMT_SIGNED_INT: + case FMT_ZERO: + /* Signed integer can only precede a P format. */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_P) + { + error = _("Expected P edit descriptor"); + goto syntax; + } + + goto data_desc; + + case FMT_P: + /* P requires a prior number. */ + error = _("P descriptor requires leading scale factor"); + goto syntax; + + case FMT_X: + /* X requires a prior number if we're being pedantic. */ + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + if (!gfc_notify_std (GFC_STD_GNU, "X descriptor requires leading " + "space count at %L", &format_locus)) + return false; + goto between_desc; + + case FMT_SIGN: + case FMT_BLANK: + case FMT_DP: + case FMT_DC: + case FMT_RC: + case FMT_RD: + case FMT_RN: + case FMT_RP: + case FMT_RU: + case FMT_RZ: + goto between_desc; + + case FMT_CHAR: + goto extension_optional_comma; + + case FMT_COLON: + case FMT_SLASH: + goto optional_comma; + + case FMT_DOLLAR: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + + if (!gfc_notify_std (GFC_STD_GNU, "$ descriptor at %L", &format_locus)) + return false; + if (t != FMT_RPAREN || level > 0) + { + gfc_warning (0, "$ should be the last specifier in format at %L", + &format_locus); + goto optional_comma_1; + } + + goto finished; + + case FMT_T: + case FMT_TL: + case FMT_TR: + case FMT_IBOZ: + case FMT_F: + case FMT_E: + case FMT_EN: + case FMT_ES: + case FMT_G: + case FMT_L: + case FMT_A: + case FMT_D: + case FMT_H: + case FMT_DT: + goto data_desc; + + case FMT_END: + error = unexpected_end; + goto syntax; + + default: + error = unexpected_element; + goto syntax; + } + +data_desc: + /* In this state, t must currently be a data descriptor. + Deal with things that can/must follow the descriptor. */ + switch (t) + { + case FMT_SIGN: + case FMT_BLANK: + case FMT_DP: + case FMT_DC: + case FMT_X: + break; + + case FMT_P: + /* No comma after P allowed only for F, E, EN, ES, D, or G. + 10.1.1 (1). */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (!(gfc_option.allow_std & GFC_STD_F2003) && t != FMT_COMMA + && t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES + && t != FMT_D && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH) + { + error = _("Comma required after P descriptor"); + goto syntax; + } + if (t != FMT_COMMA) + { + if (t == FMT_POSINT) + { + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + } + if (t != FMT_F && t != FMT_E && t != FMT_EN && t != FMT_ES && t != FMT_D + && t != FMT_G && t != FMT_RPAREN && t != FMT_SLASH) + { + error = _("Comma required after P descriptor"); + goto syntax; + } + } + + saved_token = t; + goto optional_comma; + + case FMT_T: + case FMT_TL: + case FMT_TR: + t = format_lex (); + if (t != FMT_POSINT) + { + error = _("Positive width required with T descriptor"); + goto syntax; + } + break; + + case FMT_L: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t == FMT_POSINT) + break; + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + if (t == FMT_ZERO) + { + switch (gfc_notification_std (GFC_STD_GNU)) + { + case WARNING: + gfc_warning (0, "Extension: Zero width after L " + "descriptor at %L", &format_locus); + break; + case ERROR: + gfc_error ("Extension: Zero width after L " + "descriptor at %L", &format_locus); + goto fail; + case SILENT: + break; + default: + gcc_unreachable (); + } + } + else + { + saved_token = t; + gfc_notify_std (GFC_STD_GNU, "Missing positive width after " + "L descriptor at %L", &format_locus); + } + break; + + case FMT_A: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t == FMT_ZERO) + { + error = zero_width; + goto syntax; + } + if (t != FMT_POSINT) + saved_token = t; + break; + + case FMT_D: + case FMT_E: + case FMT_G: + case FMT_EN: + case FMT_ES: + u = format_lex (); + if (t == FMT_G && u == FMT_ZERO) + { + if (is_input) + { + error = zero_width; + goto syntax; + } + if (!gfc_notify_std (GFC_STD_F2008, "%<G0%> in format at %L", + &format_locus)) + return false; + u = format_lex (); + if (u != FMT_PERIOD) + { + saved_token = u; + break; + } + u = format_lex (); + if (u != FMT_POSINT) + { + error = posint_required; + goto syntax; + } + u = format_lex (); + if (u == FMT_E) + { + error = _("E specifier not allowed with g0 descriptor"); + goto syntax; + } + saved_token = u; + break; + } + + if (u != FMT_POSINT) + { + format_locus.nextc += format_string_pos; + gfc_error ("Positive width required in format " + "specifier %s at %L", token_to_string (t), + &format_locus); + saved_token = u; + goto fail; + } + + u = format_lex (); + if (u == FMT_ERROR) + goto fail; + if (u != FMT_PERIOD) + { + /* Warn if -std=legacy, otherwise error. */ + format_locus.nextc += format_string_pos; + if (gfc_option.warn_std != 0) + { + gfc_error ("Period required in format " + "specifier %s at %L", token_to_string (t), + &format_locus); + saved_token = u; + goto fail; + } + else + gfc_warning (0, "Period required in format " + "specifier %s at %L", token_to_string (t), + &format_locus); + /* If we go to finished, we need to unwind this + before the next round. */ + format_locus.nextc -= format_string_pos; + saved_token = u; + break; + } + + u = format_lex (); + if (u == FMT_ERROR) + goto fail; + if (u != FMT_ZERO && u != FMT_POSINT) + { + error = nonneg_required; + goto syntax; + } + + if (t == FMT_D) + break; + + /* Look for optional exponent. */ + u = format_lex (); + if (u == FMT_ERROR) + goto fail; + if (u != FMT_E) + { + saved_token = u; + } + else + { + u = format_lex (); + if (u == FMT_ERROR) + goto fail; + if (u != FMT_POSINT) + { + error = _("Positive exponent width required"); + goto syntax; + } + } + + break; + + case FMT_DT: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + switch (t) + { + case FMT_RPAREN: + level--; + if (level < 0) + goto finished; + goto between_desc; + + case FMT_COMMA: + goto format_item; + + case FMT_LPAREN: + + dtio_vlist: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + + if (t != FMT_POSINT) + { + error = posint_required; + goto syntax; + } + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + + if (t == FMT_COMMA) + goto dtio_vlist; + if (t != FMT_RPAREN) + { + error = _("Right parenthesis expected at %C"); + goto syntax; + } + goto between_desc; + + default: + error = unexpected_element; + goto syntax; + } + break; + + case FMT_F: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_ZERO && t != FMT_POSINT) + { + error = nonneg_required; + goto syntax; + } + else if (is_input && t == FMT_ZERO) + { + error = posint_required; + goto syntax; + } + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_PERIOD) + { + /* Warn if -std=legacy, otherwise error. */ + if (gfc_option.warn_std != 0) + { + error = _("Period required in format specifier"); + goto syntax; + } + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + gfc_warning (0, "Period required in format specifier at %L", + &format_locus); + saved_token = t; + break; + } + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_ZERO && t != FMT_POSINT) + { + error = nonneg_required; + goto syntax; + } + + break; + + case FMT_H: + if (!(gfc_option.allow_std & GFC_STD_GNU) && !inhibit_warnings) + { + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + gfc_warning (0, "The H format specifier at %L is" + " a Fortran 95 deleted feature", &format_locus); + } + if (mode == MODE_STRING) + { + format_string += value; + format_length -= value; + format_string_pos += repeat; + } + else + { + while (repeat >0) + { + next_char (INSTRING_WARN); + repeat -- ; + } + } + break; + + case FMT_IBOZ: + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_ZERO && t != FMT_POSINT) + { + error = nonneg_required; + goto syntax; + } + else if (is_input && t == FMT_ZERO) + { + error = posint_required; + goto syntax; + } + + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_PERIOD) + { + saved_token = t; + } + else + { + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + if (t != FMT_ZERO && t != FMT_POSINT) + { + error = nonneg_required; + goto syntax; + } + } + + break; + + default: + error = unexpected_element; + goto syntax; + } + +between_desc: + /* Between a descriptor and what comes next. */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + switch (t) + { + + case FMT_COMMA: + goto format_item; + + case FMT_RPAREN: + level--; + if (level < 0) + goto finished; + goto between_desc; + + case FMT_COLON: + case FMT_SLASH: + goto optional_comma; + + case FMT_END: + error = unexpected_end; + goto syntax; + + default: + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos - 1; + if (!gfc_notify_std (GFC_STD_GNU, "Missing comma at %L", &format_locus)) + return false; + /* If we do not actually return a failure, we need to unwind this + before the next round. */ + if (mode != MODE_FORMAT) + format_locus.nextc -= format_string_pos; + goto format_item_1; + } + +optional_comma: + /* Optional comma is a weird between state where we've just finished + reading a colon, slash, dollar or P descriptor. */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; +optional_comma_1: + switch (t) + { + case FMT_COMMA: + break; + + case FMT_RPAREN: + level--; + if (level < 0) + goto finished; + goto between_desc; + + default: + /* Assume that we have another format item. */ + saved_token = t; + break; + } + + goto format_item; + +extension_optional_comma: + /* As a GNU extension, permit a missing comma after a string literal. */ + t = format_lex (); + if (t == FMT_ERROR) + goto fail; + switch (t) + { + case FMT_COMMA: + break; + + case FMT_RPAREN: + level--; + if (level < 0) + goto finished; + goto between_desc; + + case FMT_COLON: + case FMT_SLASH: + goto optional_comma; + + case FMT_END: + error = unexpected_end; + goto syntax; + + default: + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + if (!gfc_notify_std (GFC_STD_GNU, "Missing comma at %L", &format_locus)) + return false; + /* If we do not actually return a failure, we need to unwind this + before the next round. */ + if (mode != MODE_FORMAT) + format_locus.nextc -= format_string_pos; + saved_token = t; + break; + } + + goto format_item; + +syntax: + if (mode != MODE_FORMAT) + format_locus.nextc += format_string_pos; + if (error == unexpected_element) + gfc_error (error, error_element, &format_locus); + else + gfc_error ("%s in format string at %L", error, &format_locus); +fail: + rv = false; + +finished: + return rv; +} + + +/* Given an expression node that is a constant string, see if it looks + like a format string. */ + +static bool +check_format_string (gfc_expr *e, bool is_input) +{ + bool rv; + int i; + if (!e || e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT) + return true; + + mode = MODE_STRING; + format_string = e->value.character.string; + + /* More elaborate measures are needed to show where a problem is within a + format string that has been calculated, but that's probably not worth the + effort. */ + format_locus = e->where; + rv = check_format (is_input); + /* check for extraneous characters at the end of an otherwise valid format + string, like '(A10,I3)F5' + start at the end and move back to the last character processed, + spaces are OK */ + if (rv && e->value.character.length > format_string_pos) + for (i=e->value.character.length-1;i>format_string_pos-1;i--) + if (e->value.character.string[i] != ' ') + { + format_locus.nextc += format_length + 1; + gfc_warning (0, + "Extraneous characters in format at %L", &format_locus); + break; + } + return rv; +} + + +/************ Fortran I/O statement matchers *************/ + +/* Match a FORMAT statement. This amounts to actually parsing the + format descriptors in order to correctly locate the end of the + format string. */ + +match +gfc_match_format (void) +{ + gfc_expr *e; + locus start; + + if (gfc_current_ns->proc_name + && gfc_current_ns->proc_name->attr.flavor == FL_MODULE) + { + gfc_error ("Format statement in module main block at %C"); + return MATCH_ERROR; + } + + /* Before parsing the rest of a FORMAT statement, check F2008:c1206. */ + if ((gfc_current_state () == COMP_FUNCTION + || gfc_current_state () == COMP_SUBROUTINE) + && gfc_state_stack->previous->state == COMP_INTERFACE) + { + gfc_error ("FORMAT statement at %C cannot appear within an INTERFACE"); + return MATCH_ERROR; + } + + if (gfc_statement_label == NULL) + { + gfc_error ("Missing format label at %C"); + return MATCH_ERROR; + } + gfc_gobble_whitespace (); + + mode = MODE_FORMAT; + format_length = 0; + + start = gfc_current_locus; + + if (!check_format (false)) + return MATCH_ERROR; + + if (gfc_match_eos () != MATCH_YES) + { + gfc_syntax_error (ST_FORMAT); + return MATCH_ERROR; + } + + /* The label doesn't get created until after the statement is done + being matched, so we have to leave the string for later. */ + + gfc_current_locus = start; /* Back to the beginning */ + + new_st.loc = start; + new_st.op = EXEC_NOP; + + e = gfc_get_character_expr (gfc_default_character_kind, &start, + NULL, format_length); + format_string = e->value.character.string; + gfc_statement_label->format = e; + + mode = MODE_COPY; + check_format (false); /* Guaranteed to succeed */ + gfc_match_eos (); /* Guaranteed to succeed */ + + return MATCH_YES; +} + + +/* Check for a CHARACTER variable. The check for scalar is done in + resolve_tag. */ + +static bool +check_char_variable (gfc_expr *e) +{ + if (e->expr_type != EXPR_VARIABLE || e->ts.type != BT_CHARACTER) + { + gfc_error("IOMSG must be a scalar-default-char-variable at %L", &e->where); + return false; + } + return true; +} + + +static bool +is_char_type (const char *name, gfc_expr *e) +{ + gfc_resolve_expr (e); + + if (e->ts.type != BT_CHARACTER) + { + gfc_error ("%s requires a scalar-default-char-expr at %L", + name, &e->where); + return false; + } + return true; +} + + +/* Match an expression I/O tag of some sort. */ + +static match +match_etag (const io_tag *tag, gfc_expr **v) +{ + gfc_expr *result; + match m; + + m = gfc_match (tag->spec); + if (m != MATCH_YES) + return m; + + m = gfc_match (tag->value, &result); + if (m != MATCH_YES) + { + gfc_error ("Invalid value for %s specification at %C", tag->name); + return MATCH_ERROR; + } + + if (*v != NULL) + { + gfc_error ("Duplicate %s specification at %C", tag->name); + gfc_free_expr (result); + return MATCH_ERROR; + } + + *v = result; + return MATCH_YES; +} + + +/* Match a variable I/O tag of some sort. */ + +static match +match_vtag (const io_tag *tag, gfc_expr **v) +{ + gfc_expr *result; + match m; + + m = gfc_match (tag->spec); + if (m != MATCH_YES) + return m; + + m = gfc_match (tag->value, &result); + if (m != MATCH_YES) + { + gfc_error ("Invalid value for %s specification at %C", tag->name); + return MATCH_ERROR; + } + + if (*v != NULL) + { + gfc_error ("Duplicate %s specification at %C", tag->name); + gfc_free_expr (result); + return MATCH_ERROR; + } + + if (result->symtree->n.sym->attr.intent == INTENT_IN) + { + gfc_error ("Variable %s cannot be INTENT(IN) at %C", tag->name); + gfc_free_expr (result); + return MATCH_ERROR; + } + + bool impure = gfc_impure_variable (result->symtree->n.sym); + if (impure && gfc_pure (NULL)) + { + gfc_error ("Variable %s cannot be assigned in PURE procedure at %C", + tag->name); + gfc_free_expr (result); + return MATCH_ERROR; + } + + if (impure) + gfc_unset_implicit_pure (NULL); + + *v = result; + return MATCH_YES; +} + + +/* Match I/O tags that cause variables to become redefined. */ + +static match +match_out_tag (const io_tag *tag, gfc_expr **result) +{ + match m; + + m = match_vtag (tag, result); + if (m == MATCH_YES) + gfc_check_do_variable ((*result)->symtree); + + return m; +} + + +/* Match a label I/O tag. */ + +static match +match_ltag (const io_tag *tag, gfc_st_label ** label) +{ + match m; + gfc_st_label *old; + + old = *label; + m = gfc_match (tag->spec); + if (m != MATCH_YES) + return m; + + m = gfc_match (tag->value, label); + if (m != MATCH_YES) + { + gfc_error ("Invalid value for %s specification at %C", tag->name); + return MATCH_ERROR; + } + + if (old) + { + gfc_error ("Duplicate %s label specification at %C", tag->name); + return MATCH_ERROR; + } + + if (!gfc_reference_st_label (*label, ST_LABEL_TARGET)) + return MATCH_ERROR; + + return m; +} + + +/* Match a tag using match_etag, but only if -fdec is enabled. */ +static match +match_dec_etag (const io_tag *tag, gfc_expr **e) +{ + match m = match_etag (tag, e); + if (flag_dec && m != MATCH_NO) + return m; + else if (m != MATCH_NO) + { + gfc_error ("%s at %C is a DEC extension, enable with " + "%<-fdec%>", tag->name); + return MATCH_ERROR; + } + return m; +} + + +/* Match a tag using match_vtag, but only if -fdec is enabled. */ +static match +match_dec_vtag (const io_tag *tag, gfc_expr **e) +{ + match m = match_vtag(tag, e); + if (flag_dec && m != MATCH_NO) + return m; + else if (m != MATCH_NO) + { + gfc_error ("%s at %C is a DEC extension, enable with " + "%<-fdec%>", tag->name); + return MATCH_ERROR; + } + return m; +} + + +/* Match a DEC I/O flag tag - a tag with no expression such as READONLY. */ + +static match +match_dec_ftag (const io_tag *tag, gfc_open *o) +{ + match m; + + m = gfc_match (tag->spec); + if (m != MATCH_YES) + return m; + + if (!flag_dec) + { + gfc_error ("%s at %C is a DEC extension, enable with " + "%<-fdec%>", tag->name); + return MATCH_ERROR; + } + + /* Just set the READONLY flag, which we use at runtime to avoid delete on + close. */ + if (tag == &tag_readonly) + { + o->readonly |= 1; + return MATCH_YES; + } + + /* Interpret SHARED as SHARE='DENYNONE' (read lock). */ + else if (tag == &tag_shared) + { + if (o->share != NULL) + { + gfc_error ("Duplicate %s specification at %C", tag->name); + return MATCH_ERROR; + } + o->share = gfc_get_character_expr (gfc_default_character_kind, + &gfc_current_locus, "denynone", 8); + return MATCH_YES; + } + + /* Interpret NOSHARED as SHARE='DENYRW' (exclusive lock). */ + else if (tag == &tag_noshared) + { + if (o->share != NULL) + { + gfc_error ("Duplicate %s specification at %C", tag->name); + return MATCH_ERROR; + } + o->share = gfc_get_character_expr (gfc_default_character_kind, + &gfc_current_locus, "denyrw", 6); + return MATCH_YES; + } + + /* We handle all DEC tags above. */ + gcc_unreachable (); +} + + +/* Resolution of the FORMAT tag, to be called from resolve_tag. */ + +static bool +resolve_tag_format (const gfc_expr *e) +{ + if (e->expr_type == EXPR_CONSTANT + && (e->ts.type != BT_CHARACTER + || e->ts.kind != gfc_default_character_kind)) + { + gfc_error ("Constant expression in FORMAT tag at %L must be " + "of type default CHARACTER", &e->where); + return false; + } + + /* If e's rank is zero and e is not an element of an array, it should be + of integer or character type. The integer variable should be + ASSIGNED. */ + if (e->rank == 0 + && (e->expr_type != EXPR_VARIABLE + || e->symtree == NULL + || e->symtree->n.sym->as == NULL + || e->symtree->n.sym->as->rank == 0)) + { + if ((e->ts.type != BT_CHARACTER + || e->ts.kind != gfc_default_character_kind) + && e->ts.type != BT_INTEGER) + { + gfc_error ("FORMAT tag at %L must be of type default-kind CHARACTER " + "or of INTEGER", &e->where); + return false; + } + else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE) + { + if (!gfc_notify_std (GFC_STD_F95_DEL, "ASSIGNED variable in " + "FORMAT tag at %L", &e->where)) + return false; + if (e->symtree->n.sym->attr.assign != 1) + { + gfc_error ("Variable %qs at %L has not been assigned a " + "format label", e->symtree->n.sym->name, &e->where); + return false; + } + } + else if (e->ts.type == BT_INTEGER) + { + gfc_error ("Scalar %qs in FORMAT tag at %L is not an ASSIGNED " + "variable", gfc_basic_typename (e->ts.type), &e->where); + return false; + } + + return true; + } + + /* If rank is nonzero and type is not character, we allow it under GFC_STD_LEGACY. + It may be assigned an Hollerith constant. */ + if (e->ts.type != BT_CHARACTER) + { + if (!gfc_notify_std (GFC_STD_LEGACY, "Non-character in FORMAT tag " + "at %L", &e->where)) + return false; + + if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SHAPE) + { + gfc_error ("Non-character assumed shape array element in FORMAT" + " tag at %L", &e->where); + return false; + } + + if (e->rank == 0 && e->symtree->n.sym->as->type == AS_ASSUMED_SIZE) + { + gfc_error ("Non-character assumed size array element in FORMAT" + " tag at %L", &e->where); + return false; + } + + if (e->rank == 0 && e->symtree->n.sym->attr.pointer) + { + gfc_error ("Non-character pointer array element in FORMAT tag at %L", + &e->where); + return false; + } + } + + return true; +} + + +/* Do expression resolution and type-checking on an expression tag. */ + +static bool +resolve_tag (const io_tag *tag, gfc_expr *e) +{ + if (e == NULL) + return true; + + if (!gfc_resolve_expr (e)) + return false; + + if (tag == &tag_format) + return resolve_tag_format (e); + + if (e->ts.type != tag->type) + { + gfc_error ("%s tag at %L must be of type %s", tag->name, + &e->where, gfc_basic_typename (tag->type)); + return false; + } + + if (e->ts.type == BT_CHARACTER && e->ts.kind != gfc_default_character_kind) + { + gfc_error ("%s tag at %L must be a character string of default kind", + tag->name, &e->where); + return false; + } + + if (e->rank != 0) + { + gfc_error ("%s tag at %L must be scalar", tag->name, &e->where); + return false; + } + + if (tag == &tag_iomsg) + { + if (!gfc_notify_std (GFC_STD_F2003, "IOMSG tag at %L", &e->where)) + return false; + } + + if ((tag == &tag_iostat || tag == &tag_size || tag == &tag_iolength + || tag == &tag_number || tag == &tag_nextrec || tag == &tag_s_recl) + && e->ts.kind != gfc_default_integer_kind) + { + if (!gfc_notify_std (GFC_STD_F2003, "Fortran 95 requires default " + "INTEGER in %s tag at %L", tag->name, &e->where)) + return false; + } + + if (e->ts.kind != gfc_default_logical_kind && + (tag == &tag_exist || tag == &tag_named || tag == &tag_opened + || tag == &tag_pending)) + { + if (!gfc_notify_std (GFC_STD_F2008, "Non-default LOGICAL kind " + "in %s tag at %L", tag->name, &e->where)) + return false; + } + + if (tag == &tag_newunit) + { + if (!gfc_notify_std (GFC_STD_F2008, "NEWUNIT specifier at %L", + &e->where)) + return false; + } + + /* NEWUNIT, IOSTAT, SIZE and IOMSG are variable definition contexts. */ + if (tag == &tag_newunit || tag == &tag_iostat + || tag == &tag_size || tag == &tag_iomsg) + { + char context[64]; + + sprintf (context, _("%s tag"), tag->name); + if (!gfc_check_vardef_context (e, false, false, false, context)) + return false; + } + + if (tag == &tag_convert) + { + if (!gfc_notify_std (GFC_STD_GNU, "CONVERT tag at %L", &e->where)) + return false; + } + + return true; +} + + +/* Match a single tag of an OPEN statement. */ + +static match +match_open_element (gfc_open *open) +{ + match m; + + m = match_etag (&tag_e_async, &open->asynchronous); + if (m == MATCH_YES && !is_char_type ("ASYNCHRONOUS", open->asynchronous)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + m = match_etag (&tag_unit, &open->unit); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_iomsg, &open->iomsg); + if (m == MATCH_YES && !check_char_variable (open->iomsg)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_iostat, &open->iostat); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_file, &open->file); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_status, &open->status); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_access, &open->access); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_form, &open->form); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_recl, &open->recl); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_blank, &open->blank); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_position, &open->position); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_action, &open->action); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_delim, &open->delim); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_pad, &open->pad); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_decimal, &open->decimal); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_encoding, &open->encoding); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_round, &open->round); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_sign, &open->sign); + if (m != MATCH_NO) + return m; + m = match_ltag (&tag_err, &open->err); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_convert, &open->convert); + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_newunit, &open->newunit); + if (m != MATCH_NO) + return m; + + /* The following are extensions enabled with -fdec. */ + m = match_dec_etag (&tag_e_share, &open->share); + if (m != MATCH_NO) + return m; + m = match_dec_etag (&tag_cc, &open->cc); + if (m != MATCH_NO) + return m; + m = match_dec_ftag (&tag_readonly, open); + if (m != MATCH_NO) + return m; + m = match_dec_ftag (&tag_shared, open); + if (m != MATCH_NO) + return m; + m = match_dec_ftag (&tag_noshared, open); + if (m != MATCH_NO) + return m; + + return MATCH_NO; +} + + +/* Free the gfc_open structure and all the expressions it contains. */ + +void +gfc_free_open (gfc_open *open) +{ + if (open == NULL) + return; + + gfc_free_expr (open->unit); + gfc_free_expr (open->iomsg); + gfc_free_expr (open->iostat); + gfc_free_expr (open->file); + gfc_free_expr (open->status); + gfc_free_expr (open->access); + gfc_free_expr (open->form); + gfc_free_expr (open->recl); + gfc_free_expr (open->blank); + gfc_free_expr (open->position); + gfc_free_expr (open->action); + gfc_free_expr (open->delim); + gfc_free_expr (open->pad); + gfc_free_expr (open->decimal); + gfc_free_expr (open->encoding); + gfc_free_expr (open->round); + gfc_free_expr (open->sign); + gfc_free_expr (open->convert); + gfc_free_expr (open->asynchronous); + gfc_free_expr (open->newunit); + gfc_free_expr (open->share); + gfc_free_expr (open->cc); + free (open); +} + + +/* Resolve everything in a gfc_open structure. */ + +bool +gfc_resolve_open (gfc_open *open) +{ + + RESOLVE_TAG (&tag_unit, open->unit); + RESOLVE_TAG (&tag_iomsg, open->iomsg); + RESOLVE_TAG (&tag_iostat, open->iostat); + RESOLVE_TAG (&tag_file, open->file); + RESOLVE_TAG (&tag_status, open->status); + RESOLVE_TAG (&tag_e_access, open->access); + RESOLVE_TAG (&tag_e_form, open->form); + RESOLVE_TAG (&tag_e_recl, open->recl); + RESOLVE_TAG (&tag_e_blank, open->blank); + RESOLVE_TAG (&tag_e_position, open->position); + RESOLVE_TAG (&tag_e_action, open->action); + RESOLVE_TAG (&tag_e_delim, open->delim); + RESOLVE_TAG (&tag_e_pad, open->pad); + RESOLVE_TAG (&tag_e_decimal, open->decimal); + RESOLVE_TAG (&tag_e_encoding, open->encoding); + RESOLVE_TAG (&tag_e_async, open->asynchronous); + RESOLVE_TAG (&tag_e_round, open->round); + RESOLVE_TAG (&tag_e_sign, open->sign); + RESOLVE_TAG (&tag_convert, open->convert); + RESOLVE_TAG (&tag_newunit, open->newunit); + RESOLVE_TAG (&tag_e_share, open->share); + RESOLVE_TAG (&tag_cc, open->cc); + + if (!gfc_reference_st_label (open->err, ST_LABEL_TARGET)) + return false; + + return true; +} + + +/* Check if a given value for a SPECIFIER is either in the list of values + allowed in F95 or F2003, issuing an error message and returning a zero + value if it is not allowed. */ + +static int +compare_to_allowed_values (const char *specifier, const char *allowed[], + const char *allowed_f2003[], + const char *allowed_gnu[], gfc_char_t *value, + const char *statement, bool warn, + int *num = NULL); + + +static int +compare_to_allowed_values (const char *specifier, const char *allowed[], + const char *allowed_f2003[], + const char *allowed_gnu[], gfc_char_t *value, + const char *statement, bool warn, int *num) +{ + int i; + unsigned int len; + + len = gfc_wide_strlen (value); + if (len > 0) + { + for (len--; len > 0; len--) + if (value[len] != ' ') + break; + len++; + } + + for (i = 0; allowed[i]; i++) + if (len == strlen (allowed[i]) + && gfc_wide_strncasecmp (value, allowed[i], strlen (allowed[i])) == 0) + { + if (num) + *num = i; + return 1; + } + + for (i = 0; allowed_f2003 && allowed_f2003[i]; i++) + if (len == strlen (allowed_f2003[i]) + && gfc_wide_strncasecmp (value, allowed_f2003[i], + strlen (allowed_f2003[i])) == 0) + { + notification n = gfc_notification_std (GFC_STD_F2003); + + if (n == WARNING || (warn && n == ERROR)) + { + gfc_warning (0, "Fortran 2003: %s specifier in %s statement at %C " + "has value %qs", specifier, statement, + allowed_f2003[i]); + return 1; + } + else + if (n == ERROR) + { + gfc_notify_std (GFC_STD_F2003, "%s specifier in " + "%s statement at %C has value %qs", specifier, + statement, allowed_f2003[i]); + return 0; + } + + /* n == SILENT */ + return 1; + } + + for (i = 0; allowed_gnu && allowed_gnu[i]; i++) + if (len == strlen (allowed_gnu[i]) + && gfc_wide_strncasecmp (value, allowed_gnu[i], + strlen (allowed_gnu[i])) == 0) + { + notification n = gfc_notification_std (GFC_STD_GNU); + + if (n == WARNING || (warn && n == ERROR)) + { + gfc_warning (0, "Extension: %s specifier in %s statement at %C " + "has value %qs", specifier, statement, + allowed_gnu[i]); + return 1; + } + else + if (n == ERROR) + { + gfc_notify_std (GFC_STD_GNU, "%s specifier in " + "%s statement at %C has value %qs", specifier, + statement, allowed_gnu[i]); + return 0; + } + + /* n == SILENT */ + return 1; + } + + if (warn) + { + char *s = gfc_widechar_to_char (value, -1); + gfc_warning (0, + "%s specifier in %s statement at %C has invalid value %qs", + specifier, statement, s); + free (s); + return 1; + } + else + { + char *s = gfc_widechar_to_char (value, -1); + gfc_error ("%s specifier in %s statement at %C has invalid value %qs", + specifier, statement, s); + free (s); + return 0; + } +} + + +/* Match an OPEN statement. */ + +match +gfc_match_open (void) +{ + gfc_open *open; + match m; + bool warn; + + m = gfc_match_char ('('); + if (m == MATCH_NO) + return m; + + open = XCNEW (gfc_open); + + m = match_open_element (open); + + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + { + m = gfc_match_expr (&open->unit); + if (m == MATCH_ERROR) + goto cleanup; + } + + for (;;) + { + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_open_element (open); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + if (gfc_match_eos () == MATCH_NO) + goto syntax; + + if (gfc_pure (NULL)) + { + gfc_error ("OPEN statement not allowed in PURE procedure at %C"); + goto cleanup; + } + + gfc_unset_implicit_pure (NULL); + + warn = (open->err || open->iostat) ? true : false; + + /* Checks on NEWUNIT specifier. */ + if (open->newunit) + { + if (open->unit) + { + gfc_error ("UNIT specifier not allowed with NEWUNIT at %C"); + goto cleanup; + } + + if (!open->file && open->status) + { + if (open->status->expr_type == EXPR_CONSTANT + && gfc_wide_strncasecmp (open->status->value.character.string, + "scratch", 7) != 0) + { + gfc_error ("NEWUNIT specifier must have FILE= " + "or STATUS='scratch' at %C"); + goto cleanup; + } + } + } + else if (!open->unit) + { + gfc_error ("OPEN statement at %C must have UNIT or NEWUNIT specified"); + goto cleanup; + } + + /* Checks on the ACCESS specifier. */ + if (open->access && open->access->expr_type == EXPR_CONSTANT) + { + static const char *access_f95[] = { "SEQUENTIAL", "DIRECT", NULL }; + static const char *access_f2003[] = { "STREAM", NULL }; + static const char *access_gnu[] = { "APPEND", NULL }; + + if (!is_char_type ("ACCESS", open->access)) + goto cleanup; + + if (!compare_to_allowed_values ("ACCESS", access_f95, access_f2003, + access_gnu, + open->access->value.character.string, + "OPEN", warn)) + goto cleanup; + } + + /* Checks on the ACTION specifier. */ + if (open->action && open->action->expr_type == EXPR_CONSTANT) + { + gfc_char_t *str = open->action->value.character.string; + static const char *action[] = { "READ", "WRITE", "READWRITE", NULL }; + + if (!is_char_type ("ACTION", open->action)) + goto cleanup; + + if (!compare_to_allowed_values ("ACTION", action, NULL, NULL, + str, "OPEN", warn)) + goto cleanup; + + /* With READONLY, only allow ACTION='READ'. */ + if (open->readonly && (gfc_wide_strlen (str) != 4 + || gfc_wide_strncasecmp (str, "READ", 4) != 0)) + { + gfc_error ("ACTION type conflicts with READONLY specifier at %C"); + goto cleanup; + } + } + /* If we see READONLY and no ACTION, set ACTION='READ'. */ + else if (open->readonly && open->action == NULL) + { + open->action = gfc_get_character_expr (gfc_default_character_kind, + &gfc_current_locus, "read", 4); + } + + /* Checks on the ASYNCHRONOUS specifier. */ + if (open->asynchronous) + { + if (!gfc_notify_std (GFC_STD_F2003, "ASYNCHRONOUS= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("ASYNCHRONOUS", open->asynchronous)) + goto cleanup; + + if (open->asynchronous->expr_type == EXPR_CONSTANT) + { + static const char * asynchronous[] = { "YES", "NO", NULL }; + + if (!compare_to_allowed_values ("ASYNCHRONOUS", asynchronous, + NULL, NULL, open->asynchronous->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the BLANK specifier. */ + if (open->blank) + { + if (!gfc_notify_std (GFC_STD_F2003, "BLANK= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("BLANK", open->blank)) + goto cleanup; + + if (open->blank->expr_type == EXPR_CONSTANT) + { + static const char *blank[] = { "ZERO", "NULL", NULL }; + + if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL, + open->blank->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the CARRIAGECONTROL specifier. */ + if (open->cc) + { + if (!is_char_type ("CARRIAGECONTROL", open->cc)) + goto cleanup; + + if (open->cc->expr_type == EXPR_CONSTANT) + { + static const char *cc[] = { "LIST", "FORTRAN", "NONE", NULL }; + if (!compare_to_allowed_values ("CARRIAGECONTROL", cc, NULL, NULL, + open->cc->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the DECIMAL specifier. */ + if (open->decimal) + { + if (!gfc_notify_std (GFC_STD_F2003, "DECIMAL= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("DECIMAL", open->decimal)) + goto cleanup; + + if (open->decimal->expr_type == EXPR_CONSTANT) + { + static const char * decimal[] = { "COMMA", "POINT", NULL }; + + if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL, + open->decimal->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the DELIM specifier. */ + if (open->delim) + { + if (open->delim->expr_type == EXPR_CONSTANT) + { + static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL }; + + if (!is_char_type ("DELIM", open->delim)) + goto cleanup; + + if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL, + open->delim->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the ENCODING specifier. */ + if (open->encoding) + { + if (!gfc_notify_std (GFC_STD_F2003, "ENCODING= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("ENCODING", open->encoding)) + goto cleanup; + + if (open->encoding->expr_type == EXPR_CONSTANT) + { + static const char * encoding[] = { "DEFAULT", "UTF-8", NULL }; + + if (!compare_to_allowed_values ("ENCODING", encoding, NULL, NULL, + open->encoding->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the FORM specifier. */ + if (open->form && open->form->expr_type == EXPR_CONSTANT) + { + static const char *form[] = { "FORMATTED", "UNFORMATTED", NULL }; + + if (!is_char_type ("FORM", open->form)) + goto cleanup; + + if (!compare_to_allowed_values ("FORM", form, NULL, NULL, + open->form->value.character.string, + "OPEN", warn)) + goto cleanup; + } + + /* Checks on the PAD specifier. */ + if (open->pad && open->pad->expr_type == EXPR_CONSTANT) + { + static const char *pad[] = { "YES", "NO", NULL }; + + if (!is_char_type ("PAD", open->pad)) + goto cleanup; + + if (!compare_to_allowed_values ("PAD", pad, NULL, NULL, + open->pad->value.character.string, + "OPEN", warn)) + goto cleanup; + } + + /* Checks on the POSITION specifier. */ + if (open->position && open->position->expr_type == EXPR_CONSTANT) + { + static const char *position[] = { "ASIS", "REWIND", "APPEND", NULL }; + + if (!is_char_type ("POSITION", open->position)) + goto cleanup; + + if (!compare_to_allowed_values ("POSITION", position, NULL, NULL, + open->position->value.character.string, + "OPEN", warn)) + goto cleanup; + } + + /* Checks on the ROUND specifier. */ + if (open->round) + { + if (!gfc_notify_std (GFC_STD_F2003, "ROUND= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("ROUND", open->round)) + goto cleanup; + + if (open->round->expr_type == EXPR_CONSTANT) + { + static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST", + "COMPATIBLE", "PROCESSOR_DEFINED", + NULL }; + + if (!compare_to_allowed_values ("ROUND", round, NULL, NULL, + open->round->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the SHARE specifier. */ + if (open->share) + { + if (!is_char_type ("SHARE", open->share)) + goto cleanup; + + if (open->share->expr_type == EXPR_CONSTANT) + { + static const char *share[] = { "DENYNONE", "DENYRW", NULL }; + if (!compare_to_allowed_values ("SHARE", share, NULL, NULL, + open->share->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + + /* Checks on the SIGN specifier. */ + if (open->sign) + { + if (!gfc_notify_std (GFC_STD_F2003, "SIGN= at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (!is_char_type ("SIGN", open->sign)) + goto cleanup; + + if (open->sign->expr_type == EXPR_CONSTANT) + { + static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED", + NULL }; + + if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL, + open->sign->value.character.string, + "OPEN", warn)) + goto cleanup; + } + } + +#define warn_or_error(...) \ +{ \ + if (warn) \ + gfc_warning (0, __VA_ARGS__); \ + else \ + { \ + gfc_error (__VA_ARGS__); \ + goto cleanup; \ + } \ +} + + /* Checks on the RECL specifier. */ + if (open->recl && open->recl->expr_type == EXPR_CONSTANT + && open->recl->ts.type == BT_INTEGER + && mpz_sgn (open->recl->value.integer) != 1) + { + warn_or_error ("RECL in OPEN statement at %C must be positive"); + } + + /* Checks on the STATUS specifier. */ + if (open->status && open->status->expr_type == EXPR_CONSTANT) + { + static const char *status[] = { "OLD", "NEW", "SCRATCH", + "REPLACE", "UNKNOWN", NULL }; + + if (!is_char_type ("STATUS", open->status)) + goto cleanup; + + if (!compare_to_allowed_values ("STATUS", status, NULL, NULL, + open->status->value.character.string, + "OPEN", warn)) + goto cleanup; + + /* F2003, 9.4.5: If the STATUS= specifier has the value NEW or REPLACE, + the FILE= specifier shall appear. */ + if (open->file == NULL + && (gfc_wide_strncasecmp (open->status->value.character.string, + "replace", 7) == 0 + || gfc_wide_strncasecmp (open->status->value.character.string, + "new", 3) == 0)) + { + char *s = gfc_widechar_to_char (open->status->value.character.string, + -1); + warn_or_error ("The STATUS specified in OPEN statement at %C is " + "%qs and no FILE specifier is present", s); + free (s); + } + + /* F2003, 9.4.5: If the STATUS= specifier has the value SCRATCH, + the FILE= specifier shall not appear. */ + if (gfc_wide_strncasecmp (open->status->value.character.string, + "scratch", 7) == 0 && open->file) + { + warn_or_error ("The STATUS specified in OPEN statement at %C " + "cannot have the value SCRATCH if a FILE specifier " + "is present"); + } + } + + /* Things that are not allowed for unformatted I/O. */ + if (open->form && open->form->expr_type == EXPR_CONSTANT + && (open->delim || open->decimal || open->encoding || open->round + || open->sign || open->pad || open->blank) + && gfc_wide_strncasecmp (open->form->value.character.string, + "unformatted", 11) == 0) + { + const char *spec = (open->delim ? "DELIM " + : (open->pad ? "PAD " : open->blank + ? "BLANK " : "")); + + warn_or_error ("%s specifier at %C not allowed in OPEN statement for " + "unformatted I/O", spec); + } + + if (open->recl && open->access && open->access->expr_type == EXPR_CONSTANT + && gfc_wide_strncasecmp (open->access->value.character.string, + "stream", 6) == 0) + { + warn_or_error ("RECL specifier not allowed in OPEN statement at %C for " + "stream I/O"); + } + + if (open->position + && open->access && open->access->expr_type == EXPR_CONSTANT + && !(gfc_wide_strncasecmp (open->access->value.character.string, + "sequential", 10) == 0 + || gfc_wide_strncasecmp (open->access->value.character.string, + "stream", 6) == 0 + || gfc_wide_strncasecmp (open->access->value.character.string, + "append", 6) == 0)) + { + warn_or_error ("POSITION specifier in OPEN statement at %C only allowed " + "for stream or sequential ACCESS"); + } + +#undef warn_or_error + + new_st.op = EXEC_OPEN; + new_st.ext.open = open; + return MATCH_YES; + +syntax: + gfc_syntax_error (ST_OPEN); + +cleanup: + gfc_free_open (open); + return MATCH_ERROR; +} + + +/* Free a gfc_close structure an all its expressions. */ + +void +gfc_free_close (gfc_close *close) +{ + if (close == NULL) + return; + + gfc_free_expr (close->unit); + gfc_free_expr (close->iomsg); + gfc_free_expr (close->iostat); + gfc_free_expr (close->status); + free (close); +} + + +/* Match elements of a CLOSE statement. */ + +static match +match_close_element (gfc_close *close) +{ + match m; + + m = match_etag (&tag_unit, &close->unit); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_status, &close->status); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_iomsg, &close->iomsg); + if (m == MATCH_YES && !check_char_variable (close->iomsg)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_iostat, &close->iostat); + if (m != MATCH_NO) + return m; + m = match_ltag (&tag_err, &close->err); + if (m != MATCH_NO) + return m; + + return MATCH_NO; +} + + +/* Match a CLOSE statement. */ + +match +gfc_match_close (void) +{ + gfc_close *close; + match m; + bool warn; + + m = gfc_match_char ('('); + if (m == MATCH_NO) + return m; + + close = XCNEW (gfc_close); + + m = match_close_element (close); + + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + { + m = gfc_match_expr (&close->unit); + if (m == MATCH_NO) + goto syntax; + if (m == MATCH_ERROR) + goto cleanup; + } + + for (;;) + { + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_close_element (close); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + if (gfc_match_eos () == MATCH_NO) + goto syntax; + + if (gfc_pure (NULL)) + { + gfc_error ("CLOSE statement not allowed in PURE procedure at %C"); + goto cleanup; + } + + gfc_unset_implicit_pure (NULL); + + warn = (close->iostat || close->err) ? true : false; + + /* Checks on the STATUS specifier. */ + if (close->status && close->status->expr_type == EXPR_CONSTANT) + { + static const char *status[] = { "KEEP", "DELETE", NULL }; + + if (!is_char_type ("STATUS", close->status)) + goto cleanup; + + if (!compare_to_allowed_values ("STATUS", status, NULL, NULL, + close->status->value.character.string, + "CLOSE", warn)) + goto cleanup; + } + + new_st.op = EXEC_CLOSE; + new_st.ext.close = close; + return MATCH_YES; + +syntax: + gfc_syntax_error (ST_CLOSE); + +cleanup: + gfc_free_close (close); + return MATCH_ERROR; +} + + +/* Resolve everything in a gfc_close structure. */ + +bool +gfc_resolve_close (gfc_close *close) +{ + RESOLVE_TAG (&tag_unit, close->unit); + RESOLVE_TAG (&tag_iomsg, close->iomsg); + RESOLVE_TAG (&tag_iostat, close->iostat); + RESOLVE_TAG (&tag_status, close->status); + + if (!gfc_reference_st_label (close->err, ST_LABEL_TARGET)) + return false; + + if (close->unit == NULL) + { + /* Find a locus from one of the arguments to close, when UNIT is + not specified. */ + locus loc = gfc_current_locus; + if (close->status) + loc = close->status->where; + else if (close->iostat) + loc = close->iostat->where; + else if (close->iomsg) + loc = close->iomsg->where; + else if (close->err) + loc = close->err->where; + + gfc_error ("CLOSE statement at %L requires a UNIT number", &loc); + return false; + } + + if (close->unit->expr_type == EXPR_CONSTANT + && close->unit->ts.type == BT_INTEGER + && mpz_sgn (close->unit->value.integer) < 0) + { + gfc_error ("UNIT number in CLOSE statement at %L must be non-negative", + &close->unit->where); + } + + return true; +} + + +/* Free a gfc_filepos structure. */ + +void +gfc_free_filepos (gfc_filepos *fp) +{ + gfc_free_expr (fp->unit); + gfc_free_expr (fp->iomsg); + gfc_free_expr (fp->iostat); + free (fp); +} + + +/* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement. */ + +static match +match_file_element (gfc_filepos *fp) +{ + match m; + + m = match_etag (&tag_unit, &fp->unit); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_iomsg, &fp->iomsg); + if (m == MATCH_YES && !check_char_variable (fp->iomsg)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_iostat, &fp->iostat); + if (m != MATCH_NO) + return m; + m = match_ltag (&tag_err, &fp->err); + if (m != MATCH_NO) + return m; + + return MATCH_NO; +} + + +/* Match the second half of the file-positioning statements, REWIND, + BACKSPACE, ENDFILE, or the FLUSH statement. */ + +static match +match_filepos (gfc_statement st, gfc_exec_op op) +{ + gfc_filepos *fp; + match m; + + fp = XCNEW (gfc_filepos); + + if (gfc_match_char ('(') == MATCH_NO) + { + m = gfc_match_expr (&fp->unit); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + + goto done; + } + + m = match_file_element (fp); + if (m == MATCH_ERROR) + goto done; + if (m == MATCH_NO) + { + m = gfc_match_expr (&fp->unit); + if (m == MATCH_ERROR || m == MATCH_NO) + goto syntax; + } + + for (;;) + { + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_file_element (fp); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + +done: + if (gfc_match_eos () != MATCH_YES) + goto syntax; + + if (gfc_pure (NULL)) + { + gfc_error ("%s statement not allowed in PURE procedure at %C", + gfc_ascii_statement (st)); + + goto cleanup; + } + + gfc_unset_implicit_pure (NULL); + + new_st.op = op; + new_st.ext.filepos = fp; + return MATCH_YES; + +syntax: + gfc_syntax_error (st); + +cleanup: + gfc_free_filepos (fp); + return MATCH_ERROR; +} + + +bool +gfc_resolve_filepos (gfc_filepos *fp) +{ + RESOLVE_TAG (&tag_unit, fp->unit); + RESOLVE_TAG (&tag_iostat, fp->iostat); + RESOLVE_TAG (&tag_iomsg, fp->iomsg); + if (!gfc_reference_st_label (fp->err, ST_LABEL_TARGET)) + return false; + + if (!fp->unit && (fp->iostat || fp->iomsg)) + { + locus where; + where = fp->iostat ? fp->iostat->where : fp->iomsg->where; + gfc_error ("UNIT number missing in statement at %L", &where); + return false; + } + + if (fp->unit->expr_type == EXPR_CONSTANT + && fp->unit->ts.type == BT_INTEGER + && mpz_sgn (fp->unit->value.integer) < 0) + { + gfc_error ("UNIT number in statement at %L must be non-negative", + &fp->unit->where); + return false; + } + + return true; +} + + +/* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND, + and the FLUSH statement. */ + +match +gfc_match_endfile (void) +{ + return match_filepos (ST_END_FILE, EXEC_ENDFILE); +} + +match +gfc_match_backspace (void) +{ + return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE); +} + +match +gfc_match_rewind (void) +{ + return match_filepos (ST_REWIND, EXEC_REWIND); +} + +match +gfc_match_flush (void) +{ + if (!gfc_notify_std (GFC_STD_F2003, "FLUSH statement at %C")) + return MATCH_ERROR; + + return match_filepos (ST_FLUSH, EXEC_FLUSH); +} + +/******************** Data Transfer Statements *********************/ + +/* Return a default unit number. */ + +static gfc_expr * +default_unit (io_kind k) +{ + int unit; + + if (k == M_READ) + unit = 5; + else + unit = 6; + + return gfc_get_int_expr (gfc_default_integer_kind, NULL, unit); +} + + +/* Match a unit specification for a data transfer statement. */ + +static match +match_dt_unit (io_kind k, gfc_dt *dt) +{ + gfc_expr *e; + char c; + + if (gfc_match_char ('*') == MATCH_YES) + { + if (dt->io_unit != NULL) + goto conflict; + + dt->io_unit = default_unit (k); + + c = gfc_peek_ascii_char (); + if (c == ')') + gfc_error_now ("Missing format with default unit at %C"); + + return MATCH_YES; + } + + if (gfc_match_expr (&e) == MATCH_YES) + { + if (dt->io_unit != NULL) + { + gfc_free_expr (e); + goto conflict; + } + + dt->io_unit = e; + return MATCH_YES; + } + + return MATCH_NO; + +conflict: + gfc_error ("Duplicate UNIT specification at %C"); + return MATCH_ERROR; +} + + +/* Match a format specification. */ + +static match +match_dt_format (gfc_dt *dt) +{ + locus where; + gfc_expr *e; + gfc_st_label *label; + match m; + + where = gfc_current_locus; + + if (gfc_match_char ('*') == MATCH_YES) + { + if (dt->format_expr != NULL || dt->format_label != NULL) + goto conflict; + + dt->format_label = &format_asterisk; + return MATCH_YES; + } + + if ((m = gfc_match_st_label (&label)) == MATCH_YES) + { + char c; + + /* Need to check if the format label is actually either an operand + to a user-defined operator or is a kind type parameter. That is, + print 2.ip.8 ! .ip. is a user-defined operator return CHARACTER. + print 1_'(I0)', i ! 1_'(I0)' is a default character string. */ + + gfc_gobble_whitespace (); + c = gfc_peek_ascii_char (); + if (c == '.' || c == '_') + gfc_current_locus = where; + else + { + if (dt->format_expr != NULL || dt->format_label != NULL) + { + gfc_free_st_label (label); + goto conflict; + } + + if (!gfc_reference_st_label (label, ST_LABEL_FORMAT)) + return MATCH_ERROR; + + dt->format_label = label; + return MATCH_YES; + } + } + else if (m == MATCH_ERROR) + /* The label was zero or too large. Emit the correct diagnosis. */ + return MATCH_ERROR; + + if (gfc_match_expr (&e) == MATCH_YES) + { + if (dt->format_expr != NULL || dt->format_label != NULL) + { + gfc_free_expr (e); + goto conflict; + } + dt->format_expr = e; + return MATCH_YES; + } + + gfc_current_locus = where; /* The only case where we have to restore */ + + return MATCH_NO; + +conflict: + gfc_error ("Duplicate format specification at %C"); + return MATCH_ERROR; +} + +/* Check for formatted read and write DTIO procedures. */ + +static bool +dtio_procs_present (gfc_symbol *sym, io_kind k) +{ + gfc_symbol *derived; + + if (sym && sym->ts.u.derived) + { + if (sym->ts.type == BT_CLASS && CLASS_DATA (sym)) + derived = CLASS_DATA (sym)->ts.u.derived; + else if (sym->ts.type == BT_DERIVED) + derived = sym->ts.u.derived; + else + return false; + if ((k == M_WRITE || k == M_PRINT) && + (gfc_find_specific_dtio_proc (derived, true, true) != NULL)) + return true; + if ((k == M_READ) && + (gfc_find_specific_dtio_proc (derived, false, true) != NULL)) + return true; + } + return false; +} + +/* Traverse a namelist that is part of a READ statement to make sure + that none of the variables in the namelist are INTENT(IN). Returns + nonzero if we find such a variable. */ + +static int +check_namelist (gfc_symbol *sym) +{ + gfc_namelist *p; + + for (p = sym->namelist; p; p = p->next) + if (p->sym->attr.intent == INTENT_IN) + { + gfc_error ("Symbol %qs in namelist %qs is INTENT(IN) at %C", + p->sym->name, sym->name); + return 1; + } + + return 0; +} + + +/* Match a single data transfer element. */ + +static match +match_dt_element (io_kind k, gfc_dt *dt) +{ + char name[GFC_MAX_SYMBOL_LEN + 1]; + gfc_symbol *sym; + match m; + + if (gfc_match (" unit =") == MATCH_YES) + { + m = match_dt_unit (k, dt); + if (m != MATCH_NO) + return m; + } + + if (gfc_match (" fmt =") == MATCH_YES) + { + m = match_dt_format (dt); + if (m != MATCH_NO) + return m; + } + + if (gfc_match (" nml = %n", name) == MATCH_YES) + { + if (dt->namelist != NULL) + { + gfc_error ("Duplicate NML specification at %C"); + return MATCH_ERROR; + } + + if (gfc_find_symbol (name, NULL, 1, &sym)) + return MATCH_ERROR; + + if (sym == NULL || sym->attr.flavor != FL_NAMELIST) + { + gfc_error ("Symbol %qs at %C must be a NAMELIST group name", + sym != NULL ? sym->name : name); + return MATCH_ERROR; + } + + dt->namelist = sym; + if (k == M_READ && check_namelist (sym)) + return MATCH_ERROR; + + return MATCH_YES; + } + + m = match_etag (&tag_e_async, &dt->asynchronous); + if (m == MATCH_YES && !is_char_type ("ASYNCHRONOUS", dt->asynchronous)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_blank, &dt->blank); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_delim, &dt->delim); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_pad, &dt->pad); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_sign, &dt->sign); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_round, &dt->round); + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_id, &dt->id); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_e_decimal, &dt->decimal); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_rec, &dt->rec); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_spos, &dt->pos); + if (m != MATCH_NO) + return m; + m = match_etag (&tag_iomsg, &dt->iomsg); + if (m == MATCH_YES && !check_char_variable (dt->iomsg)) + return MATCH_ERROR; + if (m != MATCH_NO) + return m; + + m = match_out_tag (&tag_iostat, &dt->iostat); + if (m != MATCH_NO) + return m; + m = match_ltag (&tag_err, &dt->err); + if (m == MATCH_YES) + dt->err_where = gfc_current_locus; + if (m != MATCH_NO) + return m; + m = match_etag (&tag_advance, &dt->advance); + if (m != MATCH_NO) + return m; + m = match_out_tag (&tag_size, &dt->size); + if (m != MATCH_NO) + return m; + + m = match_ltag (&tag_end, &dt->end); + if (m == MATCH_YES) + { + if (k == M_WRITE) + { + gfc_error ("END tag at %C not allowed in output statement"); + return MATCH_ERROR; + } + dt->end_where = gfc_current_locus; + } + if (m != MATCH_NO) + return m; + + m = match_ltag (&tag_eor, &dt->eor); + if (m == MATCH_YES) + dt->eor_where = gfc_current_locus; + if (m != MATCH_NO) + return m; + + return MATCH_NO; +} + + +/* Free a data transfer structure and everything below it. */ + +void +gfc_free_dt (gfc_dt *dt) +{ + if (dt == NULL) + return; + + gfc_free_expr (dt->io_unit); + gfc_free_expr (dt->format_expr); + gfc_free_expr (dt->rec); + gfc_free_expr (dt->advance); + gfc_free_expr (dt->iomsg); + gfc_free_expr (dt->iostat); + gfc_free_expr (dt->size); + gfc_free_expr (dt->pad); + gfc_free_expr (dt->delim); + gfc_free_expr (dt->sign); + gfc_free_expr (dt->round); + gfc_free_expr (dt->blank); + gfc_free_expr (dt->decimal); + gfc_free_expr (dt->pos); + gfc_free_expr (dt->dt_io_kind); + /* dt->extra_comma is a link to dt_io_kind if it is set. */ + free (dt); +} + + +/* Resolve everything in a gfc_dt structure. */ + +bool +gfc_resolve_dt (gfc_dt *dt, locus *loc) +{ + gfc_expr *e; + io_kind k; + + /* This is set in any case. */ + gcc_assert (dt->dt_io_kind); + k = dt->dt_io_kind->value.iokind; + + RESOLVE_TAG (&tag_format, dt->format_expr); + RESOLVE_TAG (&tag_rec, dt->rec); + RESOLVE_TAG (&tag_spos, dt->pos); + RESOLVE_TAG (&tag_advance, dt->advance); + RESOLVE_TAG (&tag_id, dt->id); + RESOLVE_TAG (&tag_iomsg, dt->iomsg); + RESOLVE_TAG (&tag_iostat, dt->iostat); + RESOLVE_TAG (&tag_size, dt->size); + RESOLVE_TAG (&tag_e_pad, dt->pad); + RESOLVE_TAG (&tag_e_delim, dt->delim); + RESOLVE_TAG (&tag_e_sign, dt->sign); + RESOLVE_TAG (&tag_e_round, dt->round); + RESOLVE_TAG (&tag_e_blank, dt->blank); + RESOLVE_TAG (&tag_e_decimal, dt->decimal); + RESOLVE_TAG (&tag_e_async, dt->asynchronous); + + e = dt->io_unit; + if (e == NULL) + { + gfc_error ("UNIT not specified at %L", loc); + return false; + } + + if (gfc_resolve_expr (e) + && (e->ts.type != BT_INTEGER + && (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_VARIABLE))) + { + /* If there is no extra comma signifying the "format" form of the IO + statement, then this must be an error. */ + if (!dt->extra_comma) + { + gfc_error ("UNIT specification at %L must be an INTEGER expression " + "or a CHARACTER variable", &e->where); + return false; + } + else + { + /* At this point, we have an extra comma. If io_unit has arrived as + type character, we assume its really the "format" form of the I/O + statement. We set the io_unit to the default unit and format to + the character expression. See F95 Standard section 9.4. */ + if (e->ts.type == BT_CHARACTER && (k == M_READ || k == M_PRINT)) + { + dt->format_expr = dt->io_unit; + dt->io_unit = default_unit (k); + + /* Nullify this pointer now so that a warning/error is not + triggered below for the "Extension". */ + dt->extra_comma = NULL; + } + + if (k == M_WRITE) + { + gfc_error ("Invalid form of WRITE statement at %L, UNIT required", + &dt->extra_comma->where); + return false; + } + } + } + + if (e->ts.type == BT_CHARACTER) + { + if (gfc_has_vector_index (e)) + { + gfc_error ("Internal unit with vector subscript at %L", &e->where); + return false; + } + + /* If we are writing, make sure the internal unit can be changed. */ + gcc_assert (k != M_PRINT); + if (k == M_WRITE + && !gfc_check_vardef_context (e, false, false, false, + _("internal unit in WRITE"))) + return false; + } + + if (e->rank && e->ts.type != BT_CHARACTER) + { + gfc_error ("External IO UNIT cannot be an array at %L", &e->where); + return false; + } + + if (e->expr_type == EXPR_CONSTANT && e->ts.type == BT_INTEGER + && mpz_sgn (e->value.integer) < 0) + { + gfc_error ("UNIT number in statement at %L must be non-negative", + &e->where); + return false; + } + + /* If we are reading and have a namelist, check that all namelist symbols + can appear in a variable definition context. */ + if (dt->namelist) + { + gfc_namelist* n; + for (n = dt->namelist->namelist; n; n = n->next) + { + gfc_expr* e; + bool t; + + if (k == M_READ) + { + e = gfc_get_variable_expr (gfc_find_sym_in_symtree (n->sym)); + t = gfc_check_vardef_context (e, false, false, false, NULL); + gfc_free_expr (e); + + if (!t) + { + gfc_error ("NAMELIST %qs in READ statement at %L contains" + " the symbol %qs which may not appear in a" + " variable definition context", + dt->namelist->name, loc, n->sym->name); + return false; + } + } + + t = dtio_procs_present (n->sym, k); + + if (n->sym->ts.type == BT_CLASS && !t) + { + gfc_error ("NAMELIST object %qs in namelist %qs at %L is " + "polymorphic and requires a defined input/output " + "procedure", n->sym->name, dt->namelist->name, loc); + return false; + } + + if ((n->sym->ts.type == BT_DERIVED) + && (n->sym->ts.u.derived->attr.alloc_comp + || n->sym->ts.u.derived->attr.pointer_comp)) + { + if (!gfc_notify_std (GFC_STD_F2003, "NAMELIST object %qs in " + "namelist %qs at %L with ALLOCATABLE " + "or POINTER components", n->sym->name, + dt->namelist->name, loc)) + return false; + + if (!t) + { + gfc_error ("NAMELIST object %qs in namelist %qs at %L has " + "ALLOCATABLE or POINTER components and thus requires " + "a defined input/output procedure", n->sym->name, + dt->namelist->name, loc); + return false; + } + } + } + } + + if (dt->extra_comma + && !gfc_notify_std (GFC_STD_LEGACY, "Comma before i/o item list at %L", + &dt->extra_comma->where)) + return false; + + if (dt->err) + { + if (!gfc_reference_st_label (dt->err, ST_LABEL_TARGET)) + return false; + if (dt->err->defined == ST_LABEL_UNKNOWN) + { + gfc_error ("ERR tag label %d at %L not defined", + dt->err->value, &dt->err_where); + return false; + } + } + + if (dt->end) + { + if (!gfc_reference_st_label (dt->end, ST_LABEL_TARGET)) + return false; + if (dt->end->defined == ST_LABEL_UNKNOWN) + { + gfc_error ("END tag label %d at %L not defined", + dt->end->value, &dt->end_where); + return false; + } + } + + if (dt->eor) + { + if (!gfc_reference_st_label (dt->eor, ST_LABEL_TARGET)) + return false; + if (dt->eor->defined == ST_LABEL_UNKNOWN) + { + gfc_error ("EOR tag label %d at %L not defined", + dt->eor->value, &dt->eor_where); + return false; + } + } + + /* Check the format label actually exists. */ + if (dt->format_label && dt->format_label != &format_asterisk + && dt->format_label->defined == ST_LABEL_UNKNOWN) + { + gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value, + loc); + return false; + } + + return true; +} + + +/* Given an io_kind, return its name. */ + +static const char * +io_kind_name (io_kind k) +{ + const char *name; + + switch (k) + { + case M_READ: + name = "READ"; + break; + case M_WRITE: + name = "WRITE"; + break; + case M_PRINT: + name = "PRINT"; + break; + case M_INQUIRE: + name = "INQUIRE"; + break; + default: + gfc_internal_error ("io_kind_name(): bad I/O-kind"); + } + + return name; +} + + +/* Match an IO iteration statement of the form: + + ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] ) + + which is equivalent to a single IO element. This function is + mutually recursive with match_io_element(). */ + +static match match_io_element (io_kind, gfc_code **); + +static match +match_io_iterator (io_kind k, gfc_code **result) +{ + gfc_code *head, *tail, *new_code; + gfc_iterator *iter; + locus old_loc; + match m; + int n; + + iter = NULL; + head = NULL; + old_loc = gfc_current_locus; + + if (gfc_match_char ('(') != MATCH_YES) + return MATCH_NO; + + m = match_io_element (k, &head); + tail = head; + + if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES) + { + m = MATCH_NO; + goto cleanup; + } + + /* Can't be anything but an IO iterator. Build a list. */ + iter = gfc_get_iterator (); + + for (n = 1;; n++) + { + m = gfc_match_iterator (iter, 0); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_YES) + { + gfc_check_do_variable (iter->var->symtree); + break; + } + + m = match_io_element (k, &new_code); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + { + if (n > 2) + goto syntax; + goto cleanup; + } + + tail = gfc_append_code (tail, new_code); + + if (gfc_match_char (',') != MATCH_YES) + { + if (n > 2) + goto syntax; + m = MATCH_NO; + goto cleanup; + } + } + + if (gfc_match_char (')') != MATCH_YES) + goto syntax; + + new_code = gfc_get_code (EXEC_DO); + new_code->ext.iterator = iter; + + new_code->block = gfc_get_code (EXEC_DO); + new_code->block->next = head; + + *result = new_code; + return MATCH_YES; + +syntax: + gfc_error ("Syntax error in I/O iterator at %C"); + m = MATCH_ERROR; + +cleanup: + gfc_free_iterator (iter, 1); + gfc_free_statements (head); + gfc_current_locus = old_loc; + return m; +} + + +/* Match a single element of an IO list, which is either a single + expression or an IO Iterator. */ + +static match +match_io_element (io_kind k, gfc_code **cpp) +{ + gfc_expr *expr; + gfc_code *cp; + match m; + + expr = NULL; + + m = match_io_iterator (k, cpp); + if (m == MATCH_YES) + return MATCH_YES; + + if (k == M_READ) + { + m = gfc_match_variable (&expr, 0); + if (m == MATCH_NO) + gfc_error ("Expected variable in READ statement at %C"); + } + else + { + m = gfc_match_expr (&expr); + if (m == MATCH_NO) + gfc_error ("Expected expression in %s statement at %C", + io_kind_name (k)); + } + + if (m == MATCH_YES && k == M_READ && gfc_check_do_variable (expr->symtree)) + m = MATCH_ERROR; + + if (m != MATCH_YES) + { + gfc_free_expr (expr); + return MATCH_ERROR; + } + + cp = gfc_get_code (EXEC_TRANSFER); + cp->expr1 = expr; + if (k != M_INQUIRE) + cp->ext.dt = current_dt; + + *cpp = cp; + return MATCH_YES; +} + + +/* Match an I/O list, building gfc_code structures as we go. */ + +static match +match_io_list (io_kind k, gfc_code **head_p) +{ + gfc_code *head, *tail, *new_code; + match m; + + *head_p = head = tail = NULL; + if (gfc_match_eos () == MATCH_YES) + return MATCH_YES; + + for (;;) + { + m = match_io_element (k, &new_code); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + + tail = gfc_append_code (tail, new_code); + if (head == NULL) + head = new_code; + + if (gfc_match_eos () == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + } + + *head_p = head; + return MATCH_YES; + +syntax: + gfc_error ("Syntax error in %s statement at %C", io_kind_name (k)); + +cleanup: + gfc_free_statements (head); + return MATCH_ERROR; +} + + +/* Attach the data transfer end node. */ + +static void +terminate_io (gfc_code *io_code) +{ + gfc_code *c; + + if (io_code == NULL) + io_code = new_st.block; + + c = gfc_get_code (EXEC_DT_END); + + /* Point to structure that is already there */ + c->ext.dt = new_st.ext.dt; + gfc_append_code (io_code, c); +} + + +/* Check the constraints for a data transfer statement. The majority of the + constraints appearing in 9.4 of the standard appear here. Some are handled + in resolve_tag and others in gfc_resolve_dt. Also set the async_io_dt flag + and, if necessary, the asynchronous flag on the SIZE argument. */ + +static match +check_io_constraints (io_kind k, gfc_dt *dt, gfc_code *io_code, + locus *spec_end) +{ +#define io_constraint(condition,msg,arg)\ +if (condition) \ + {\ + gfc_error(msg,arg);\ + m = MATCH_ERROR;\ + } + + match m; + gfc_expr *expr; + gfc_symbol *sym = NULL; + bool warn, unformatted; + + warn = (dt->err || dt->iostat) ? true : false; + unformatted = dt->format_expr == NULL && dt->format_label == NULL + && dt->namelist == NULL; + + m = MATCH_YES; + + expr = dt->io_unit; + if (expr && expr->expr_type == EXPR_VARIABLE + && expr->ts.type == BT_CHARACTER) + { + sym = expr->symtree->n.sym; + + io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN, + "Internal file at %L must not be INTENT(IN)", + &expr->where); + + io_constraint (gfc_has_vector_index (dt->io_unit), + "Internal file incompatible with vector subscript at %L", + &expr->where); + + io_constraint (dt->rec != NULL, + "REC tag at %L is incompatible with internal file", + &dt->rec->where); + + io_constraint (dt->pos != NULL, + "POS tag at %L is incompatible with internal file", + &dt->pos->where); + + io_constraint (unformatted, + "Unformatted I/O not allowed with internal unit at %L", + &dt->io_unit->where); + + io_constraint (dt->asynchronous != NULL, + "ASYNCHRONOUS tag at %L not allowed with internal file", + &dt->asynchronous->where); + + if (dt->namelist != NULL) + { + if (!gfc_notify_std (GFC_STD_F2003, "Internal file at %L with " + "namelist", &expr->where)) + m = MATCH_ERROR; + } + + io_constraint (dt->advance != NULL, + "ADVANCE tag at %L is incompatible with internal file", + &dt->advance->where); + } + + if (expr && expr->ts.type != BT_CHARACTER) + { + + io_constraint (gfc_pure (NULL) && (k == M_READ || k == M_WRITE), + "IO UNIT in %s statement at %C must be " + "an internal file in a PURE procedure", + io_kind_name (k)); + + if (k == M_READ || k == M_WRITE) + gfc_unset_implicit_pure (NULL); + } + + if (k != M_READ) + { + io_constraint (dt->end, "END tag not allowed with output at %L", + &dt->end_where); + + io_constraint (dt->eor, "EOR tag not allowed with output at %L", + &dt->eor_where); + + io_constraint (dt->blank, "BLANK= specifier not allowed with output at %L", + &dt->blank->where); + + io_constraint (dt->pad, "PAD= specifier not allowed with output at %L", + &dt->pad->where); + + io_constraint (dt->size, "SIZE= specifier not allowed with output at %L", + &dt->size->where); + } + else + { + io_constraint (dt->size && dt->advance == NULL, + "SIZE tag at %L requires an ADVANCE tag", + &dt->size->where); + + io_constraint (dt->eor && dt->advance == NULL, + "EOR tag at %L requires an ADVANCE tag", + &dt->eor_where); + } + + if (dt->asynchronous) + { + int num; + static const char * asynchronous[] = { "YES", "NO", NULL }; + + if (!gfc_reduce_init_expr (dt->asynchronous)) + { + gfc_error ("ASYNCHRONOUS= specifier at %L must be an initialization " + "expression", &dt->asynchronous->where); + return MATCH_ERROR; + } + + if (!is_char_type ("ASYNCHRONOUS", dt->asynchronous)) + return MATCH_ERROR; + + if (!compare_to_allowed_values + ("ASYNCHRONOUS", asynchronous, NULL, NULL, + dt->asynchronous->value.character.string, + io_kind_name (k), warn, &num)) + return MATCH_ERROR; + + /* Best to put this here because the yes/no info is still around. */ + async_io_dt = num == 0; + if (async_io_dt && dt->size) + dt->size->symtree->n.sym->attr.asynchronous = 1; + } + else + async_io_dt = false; + + if (dt->id) + { + bool not_yes + = !dt->asynchronous + || gfc_wide_strlen (dt->asynchronous->value.character.string) != 3 + || gfc_wide_strncasecmp (dt->asynchronous->value.character.string, + "yes", 3) != 0; + io_constraint (not_yes, + "ID= specifier at %L must be with ASYNCHRONOUS='yes' " + "specifier", &dt->id->where); + } + + if (dt->decimal) + { + if (!gfc_notify_std (GFC_STD_F2003, "DECIMAL= at %C " + "not allowed in Fortran 95")) + return MATCH_ERROR; + + if (dt->decimal->expr_type == EXPR_CONSTANT) + { + static const char * decimal[] = { "COMMA", "POINT", NULL }; + + if (!is_char_type ("DECIMAL", dt->decimal)) + return MATCH_ERROR; + + if (!compare_to_allowed_values ("DECIMAL", decimal, NULL, NULL, + dt->decimal->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + + io_constraint (unformatted, + "the DECIMAL= specifier at %L must be with an " + "explicit format expression", &dt->decimal->where); + } + } + + if (dt->blank) + { + if (!gfc_notify_std (GFC_STD_F2003, "BLANK= at %C " + "not allowed in Fortran 95")) + return MATCH_ERROR; + + if (!is_char_type ("BLANK", dt->blank)) + return MATCH_ERROR; + + if (dt->blank->expr_type == EXPR_CONSTANT) + { + static const char * blank[] = { "NULL", "ZERO", NULL }; + + + if (!compare_to_allowed_values ("BLANK", blank, NULL, NULL, + dt->blank->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + + io_constraint (unformatted, + "the BLANK= specifier at %L must be with an " + "explicit format expression", &dt->blank->where); + } + } + + if (dt->pad) + { + if (!gfc_notify_std (GFC_STD_F2003, "PAD= at %C " + "not allowed in Fortran 95")) + return MATCH_ERROR; + + if (!is_char_type ("PAD", dt->pad)) + return MATCH_ERROR; + + if (dt->pad->expr_type == EXPR_CONSTANT) + { + static const char * pad[] = { "YES", "NO", NULL }; + + if (!compare_to_allowed_values ("PAD", pad, NULL, NULL, + dt->pad->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + + io_constraint (unformatted, + "the PAD= specifier at %L must be with an " + "explicit format expression", &dt->pad->where); + } + } + + if (dt->round) + { + if (!gfc_notify_std (GFC_STD_F2003, "ROUND= at %C " + "not allowed in Fortran 95")) + return MATCH_ERROR; + + if (!is_char_type ("ROUND", dt->round)) + return MATCH_ERROR; + + if (dt->round->expr_type == EXPR_CONSTANT) + { + static const char * round[] = { "UP", "DOWN", "ZERO", "NEAREST", + "COMPATIBLE", "PROCESSOR_DEFINED", + NULL }; + + if (!compare_to_allowed_values ("ROUND", round, NULL, NULL, + dt->round->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + } + } + + if (dt->sign) + { + /* When implemented, change the following to use gfc_notify_std F2003. + if (gfc_notify_std (GFC_STD_F2003, "SIGN= at %C " + "not allowed in Fortran 95") == false) + return MATCH_ERROR; */ + + if (!is_char_type ("SIGN", dt->sign)) + return MATCH_ERROR; + + if (dt->sign->expr_type == EXPR_CONSTANT) + { + static const char * sign[] = { "PLUS", "SUPPRESS", "PROCESSOR_DEFINED", + NULL }; + + if (!compare_to_allowed_values ("SIGN", sign, NULL, NULL, + dt->sign->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + + io_constraint (unformatted, + "SIGN= specifier at %L must be with an " + "explicit format expression", &dt->sign->where); + + io_constraint (k == M_READ, + "SIGN= specifier at %L not allowed in a " + "READ statement", &dt->sign->where); + } + } + + if (dt->delim) + { + if (!gfc_notify_std (GFC_STD_F2003, "DELIM= at %C " + "not allowed in Fortran 95")) + return MATCH_ERROR; + + if (!is_char_type ("DELIM", dt->delim)) + return MATCH_ERROR; + + if (dt->delim->expr_type == EXPR_CONSTANT) + { + static const char *delim[] = { "APOSTROPHE", "QUOTE", "NONE", NULL }; + + if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL, + dt->delim->value.character.string, + io_kind_name (k), warn)) + return MATCH_ERROR; + + io_constraint (k == M_READ, + "DELIM= specifier at %L not allowed in a " + "READ statement", &dt->delim->where); + + io_constraint (dt->format_label != &format_asterisk + && dt->namelist == NULL, + "DELIM= specifier at %L must have FMT=*", + &dt->delim->where); + + io_constraint (unformatted && dt->namelist == NULL, + "DELIM= specifier at %L must be with FMT=* or " + "NML= specifier", &dt->delim->where); + } + } + + if (dt->namelist) + { + io_constraint (io_code && dt->namelist, + "NAMELIST cannot be followed by IO-list at %L", + &io_code->loc); + + io_constraint (dt->format_expr, + "IO spec-list cannot contain both NAMELIST group name " + "and format specification at %L", + &dt->format_expr->where); + + io_constraint (dt->format_label, + "IO spec-list cannot contain both NAMELIST group name " + "and format label at %L", spec_end); + + io_constraint (dt->rec, + "NAMELIST IO is not allowed with a REC= specifier " + "at %L", &dt->rec->where); + + io_constraint (dt->advance, + "NAMELIST IO is not allowed with a ADVANCE= specifier " + "at %L", &dt->advance->where); + } + + if (dt->rec) + { + io_constraint (dt->end, + "An END tag is not allowed with a " + "REC= specifier at %L", &dt->end_where); + + io_constraint (dt->format_label == &format_asterisk, + "FMT=* is not allowed with a REC= specifier " + "at %L", spec_end); + + io_constraint (dt->pos, + "POS= is not allowed with REC= specifier " + "at %L", &dt->pos->where); + } + + if (dt->advance) + { + int not_yes, not_no; + expr = dt->advance; + + io_constraint (dt->format_label == &format_asterisk, + "List directed format(*) is not allowed with a " + "ADVANCE= specifier at %L.", &expr->where); + + io_constraint (unformatted, + "the ADVANCE= specifier at %L must appear with an " + "explicit format expression", &expr->where); + + if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER) + { + const gfc_char_t *advance = expr->value.character.string; + not_no = gfc_wide_strlen (advance) != 2 + || gfc_wide_strncasecmp (advance, "no", 2) != 0; + not_yes = gfc_wide_strlen (advance) != 3 + || gfc_wide_strncasecmp (advance, "yes", 3) != 0; + } + else + { + not_no = 0; + not_yes = 0; + } + + io_constraint (not_no && not_yes, + "ADVANCE= specifier at %L must have value = " + "YES or NO.", &expr->where); + + io_constraint (dt->size && not_no && k == M_READ, + "SIZE tag at %L requires an ADVANCE = %<NO%>", + &dt->size->where); + + io_constraint (dt->eor && not_no && k == M_READ, + "EOR tag at %L requires an ADVANCE = %<NO%>", + &dt->eor_where); + } + + expr = dt->format_expr; + if (!gfc_simplify_expr (expr, 0) + || !check_format_string (expr, k == M_READ)) + return MATCH_ERROR; + + return m; +} +#undef io_constraint + + +/* Match a READ, WRITE or PRINT statement. */ + +static match +match_io (io_kind k) +{ + char name[GFC_MAX_SYMBOL_LEN + 1]; + gfc_code *io_code; + gfc_symbol *sym; + int comma_flag; + locus where; + locus spec_end, control; + gfc_dt *dt; + match m; + + where = gfc_current_locus; + comma_flag = 0; + current_dt = dt = XCNEW (gfc_dt); + m = gfc_match_char ('('); + if (m == MATCH_NO) + { + where = gfc_current_locus; + if (k == M_WRITE) + goto syntax; + else if (k == M_PRINT) + { + /* Treat the non-standard case of PRINT namelist. */ + if ((gfc_current_form == FORM_FIXED || gfc_peek_ascii_char () == ' ') + && gfc_match_name (name) == MATCH_YES) + { + gfc_find_symbol (name, NULL, 1, &sym); + if (sym && sym->attr.flavor == FL_NAMELIST) + { + if (!gfc_notify_std (GFC_STD_GNU, "PRINT namelist at " + "%C is an extension")) + { + m = MATCH_ERROR; + goto cleanup; + } + + dt->io_unit = default_unit (k); + dt->namelist = sym; + goto get_io_list; + } + else + gfc_current_locus = where; + } + } + + if (gfc_current_form == FORM_FREE) + { + char c = gfc_peek_ascii_char (); + if (c != ' ' && c != '*' && c != '\'' && c != '"') + { + m = MATCH_NO; + goto cleanup; + } + } + + m = match_dt_format (dt); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + + comma_flag = 1; + dt->io_unit = default_unit (k); + goto get_io_list; + } + else + { + /* Before issuing an error for a malformed 'print (1,*)' type of + error, check for a default-char-expr of the form ('(I0)'). */ + if (m == MATCH_YES) + { + control = gfc_current_locus; + if (k == M_PRINT) + { + /* Reset current locus to get the initial '(' in an expression. */ + gfc_current_locus = where; + dt->format_expr = NULL; + m = match_dt_format (dt); + + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO || dt->format_expr == NULL) + goto syntax; + + comma_flag = 1; + dt->io_unit = default_unit (k); + goto get_io_list; + } + if (k == M_READ) + { + /* Commit any pending symbols now so that when we undo + symbols later we wont lose them. */ + gfc_commit_symbols (); + /* Reset current locus to get the initial '(' in an expression. */ + gfc_current_locus = where; + dt->format_expr = NULL; + m = gfc_match_expr (&dt->format_expr); + if (m == MATCH_YES) + { + if (dt->format_expr + && dt->format_expr->ts.type == BT_CHARACTER) + { + comma_flag = 1; + dt->io_unit = default_unit (k); + goto get_io_list; + } + else + { + gfc_free_expr (dt->format_expr); + dt->format_expr = NULL; + gfc_current_locus = control; + } + } + else + { + gfc_clear_error (); + gfc_undo_symbols (); + gfc_free_expr (dt->format_expr); + dt->format_expr = NULL; + gfc_current_locus = control; + } + } + } + } + + /* Match a control list */ + if (match_dt_element (k, dt) == MATCH_YES) + goto next; + if (match_dt_unit (k, dt) != MATCH_YES) + goto loop; + + if (gfc_match_char (')') == MATCH_YES) + goto get_io_list; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_dt_element (k, dt); + if (m == MATCH_YES) + goto next; + if (m == MATCH_ERROR) + goto cleanup; + + m = match_dt_format (dt); + if (m == MATCH_YES) + goto next; + if (m == MATCH_ERROR) + goto cleanup; + + where = gfc_current_locus; + + m = gfc_match_name (name); + if (m == MATCH_YES) + { + gfc_find_symbol (name, NULL, 1, &sym); + if (sym && sym->attr.flavor == FL_NAMELIST) + { + dt->namelist = sym; + if (k == M_READ && check_namelist (sym)) + { + m = MATCH_ERROR; + goto cleanup; + } + goto next; + } + } + + gfc_current_locus = where; + + goto loop; /* No matches, try regular elements */ + +next: + if (gfc_match_char (')') == MATCH_YES) + goto get_io_list; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + +loop: + for (;;) + { + m = match_dt_element (k, dt); + if (m == MATCH_NO) + goto syntax; + if (m == MATCH_ERROR) + goto cleanup; + + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + } + +get_io_list: + + /* Used in check_io_constraints, where no locus is available. */ + spec_end = gfc_current_locus; + + /* Save the IO kind for later use. */ + dt->dt_io_kind = gfc_get_iokind_expr (&gfc_current_locus, k); + + /* Optional leading comma (non-standard). We use a gfc_expr structure here + to save the locus. This is used later when resolving transfer statements + that might have a format expression without unit number. */ + if (!comma_flag && gfc_match_char (',') == MATCH_YES) + dt->extra_comma = dt->dt_io_kind; + + io_code = NULL; + if (gfc_match_eos () != MATCH_YES) + { + if (comma_flag && gfc_match_char (',') != MATCH_YES) + { + gfc_error ("Expected comma in I/O list at %C"); + m = MATCH_ERROR; + goto cleanup; + } + + m = match_io_list (k, &io_code); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + /* See if we want to use defaults for missing exponents in real transfers. */ + if (flag_dec) + dt->default_exp = 1; + + /* A full IO statement has been matched. Check the constraints. spec_end is + supplied for cases where no locus is supplied. */ + m = check_io_constraints (k, dt, io_code, &spec_end); + + if (m == MATCH_ERROR) + goto cleanup; + + new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE; + new_st.ext.dt = dt; + new_st.block = gfc_get_code (new_st.op); + new_st.block->next = io_code; + + terminate_io (io_code); + + return MATCH_YES; + +syntax: + gfc_error ("Syntax error in %s statement at %C", io_kind_name (k)); + m = MATCH_ERROR; + +cleanup: + gfc_free_dt (dt); + return m; +} + + +match +gfc_match_read (void) +{ + return match_io (M_READ); +} + + +match +gfc_match_write (void) +{ + return match_io (M_WRITE); +} + + +match +gfc_match_print (void) +{ + match m; + + m = match_io (M_PRINT); + if (m != MATCH_YES) + return m; + + if (gfc_pure (NULL)) + { + gfc_error ("PRINT statement at %C not allowed within PURE procedure"); + return MATCH_ERROR; + } + + gfc_unset_implicit_pure (NULL); + + return MATCH_YES; +} + + +/* Free a gfc_inquire structure. */ + +void +gfc_free_inquire (gfc_inquire *inquire) +{ + + if (inquire == NULL) + return; + + gfc_free_expr (inquire->unit); + gfc_free_expr (inquire->file); + gfc_free_expr (inquire->iomsg); + gfc_free_expr (inquire->iostat); + gfc_free_expr (inquire->exist); + gfc_free_expr (inquire->opened); + gfc_free_expr (inquire->number); + gfc_free_expr (inquire->named); + gfc_free_expr (inquire->name); + gfc_free_expr (inquire->access); + gfc_free_expr (inquire->sequential); + gfc_free_expr (inquire->direct); + gfc_free_expr (inquire->form); + gfc_free_expr (inquire->formatted); + gfc_free_expr (inquire->unformatted); + gfc_free_expr (inquire->recl); + gfc_free_expr (inquire->nextrec); + gfc_free_expr (inquire->blank); + gfc_free_expr (inquire->position); + gfc_free_expr (inquire->action); + gfc_free_expr (inquire->read); + gfc_free_expr (inquire->write); + gfc_free_expr (inquire->readwrite); + gfc_free_expr (inquire->delim); + gfc_free_expr (inquire->encoding); + gfc_free_expr (inquire->pad); + gfc_free_expr (inquire->iolength); + gfc_free_expr (inquire->convert); + gfc_free_expr (inquire->strm_pos); + gfc_free_expr (inquire->asynchronous); + gfc_free_expr (inquire->decimal); + gfc_free_expr (inquire->pending); + gfc_free_expr (inquire->id); + gfc_free_expr (inquire->sign); + gfc_free_expr (inquire->size); + gfc_free_expr (inquire->round); + gfc_free_expr (inquire->share); + gfc_free_expr (inquire->cc); + free (inquire); +} + + +/* Match an element of an INQUIRE statement. */ + +#define RETM if (m != MATCH_NO) return m; + +static match +match_inquire_element (gfc_inquire *inquire) +{ + match m; + + m = match_etag (&tag_unit, &inquire->unit); + RETM m = match_etag (&tag_file, &inquire->file); + RETM m = match_ltag (&tag_err, &inquire->err); + RETM m = match_etag (&tag_iomsg, &inquire->iomsg); + if (m == MATCH_YES && !check_char_variable (inquire->iomsg)) + return MATCH_ERROR; + RETM m = match_out_tag (&tag_iostat, &inquire->iostat); + RETM m = match_vtag (&tag_exist, &inquire->exist); + RETM m = match_vtag (&tag_opened, &inquire->opened); + RETM m = match_vtag (&tag_named, &inquire->named); + RETM m = match_vtag (&tag_name, &inquire->name); + RETM m = match_out_tag (&tag_number, &inquire->number); + RETM m = match_vtag (&tag_s_access, &inquire->access); + RETM m = match_vtag (&tag_sequential, &inquire->sequential); + RETM m = match_vtag (&tag_direct, &inquire->direct); + RETM m = match_vtag (&tag_s_form, &inquire->form); + RETM m = match_vtag (&tag_formatted, &inquire->formatted); + RETM m = match_vtag (&tag_unformatted, &inquire->unformatted); + RETM m = match_out_tag (&tag_s_recl, &inquire->recl); + RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec); + RETM m = match_vtag (&tag_s_blank, &inquire->blank); + RETM m = match_vtag (&tag_s_position, &inquire->position); + RETM m = match_vtag (&tag_s_action, &inquire->action); + RETM m = match_vtag (&tag_read, &inquire->read); + RETM m = match_vtag (&tag_write, &inquire->write); + RETM m = match_vtag (&tag_readwrite, &inquire->readwrite); + RETM m = match_vtag (&tag_s_async, &inquire->asynchronous); + if (m == MATCH_YES && !is_char_type ("ASYNCHRONOUS", inquire->asynchronous)) + return MATCH_ERROR; + RETM m = match_vtag (&tag_s_delim, &inquire->delim); + RETM m = match_vtag (&tag_s_decimal, &inquire->decimal); + RETM m = match_out_tag (&tag_size, &inquire->size); + RETM m = match_vtag (&tag_s_encoding, &inquire->encoding); + RETM m = match_vtag (&tag_s_round, &inquire->round); + RETM m = match_vtag (&tag_s_sign, &inquire->sign); + RETM m = match_vtag (&tag_s_pad, &inquire->pad); + RETM m = match_out_tag (&tag_iolength, &inquire->iolength); + RETM m = match_vtag (&tag_convert, &inquire->convert); + RETM m = match_out_tag (&tag_strm_out, &inquire->strm_pos); + RETM m = match_vtag (&tag_pending, &inquire->pending); + RETM m = match_vtag (&tag_id, &inquire->id); + RETM m = match_vtag (&tag_s_iqstream, &inquire->iqstream); + RETM m = match_dec_vtag (&tag_v_share, &inquire->share); + RETM m = match_dec_vtag (&tag_v_cc, &inquire->cc); + RETM return MATCH_NO; +} + +#undef RETM + + +match +gfc_match_inquire (void) +{ + gfc_inquire *inquire; + gfc_code *code; + match m; + locus loc; + + m = gfc_match_char ('('); + if (m == MATCH_NO) + return m; + + inquire = XCNEW (gfc_inquire); + + loc = gfc_current_locus; + + m = match_inquire_element (inquire); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + { + m = gfc_match_expr (&inquire->unit); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + /* See if we have the IOLENGTH form of the inquire statement. */ + if (inquire->iolength != NULL) + { + if (gfc_match_char (')') != MATCH_YES) + goto syntax; + + m = match_io_list (M_INQUIRE, &code); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + + new_st.op = EXEC_IOLENGTH; + new_st.expr1 = inquire->iolength; + new_st.ext.inquire = inquire; + + if (gfc_pure (NULL)) + { + gfc_free_statements (code); + gfc_error ("INQUIRE statement not allowed in PURE procedure at %C"); + return MATCH_ERROR; + } + + gfc_unset_implicit_pure (NULL); + + new_st.block = gfc_get_code (EXEC_IOLENGTH); + terminate_io (code); + new_st.block->next = code; + return MATCH_YES; + } + + /* At this point, we have the non-IOLENGTH inquire statement. */ + for (;;) + { + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_inquire_element (inquire); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + + if (inquire->iolength != NULL) + { + gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C"); + goto cleanup; + } + } + + if (gfc_match_eos () != MATCH_YES) + goto syntax; + + if (inquire->unit != NULL && inquire->file != NULL) + { + gfc_error ("INQUIRE statement at %L cannot contain both FILE and " + "UNIT specifiers", &loc); + goto cleanup; + } + + if (inquire->unit == NULL && inquire->file == NULL) + { + gfc_error ("INQUIRE statement at %L requires either FILE or " + "UNIT specifier", &loc); + goto cleanup; + } + + if (inquire->unit != NULL && inquire->unit->expr_type == EXPR_CONSTANT + && inquire->unit->ts.type == BT_INTEGER + && ((mpz_get_si (inquire->unit->value.integer) == GFC_INTERNAL_UNIT4) + || (mpz_get_si (inquire->unit->value.integer) == GFC_INTERNAL_UNIT))) + { + gfc_error ("UNIT number in INQUIRE statement at %L can not " + "be %d", &loc, (int) mpz_get_si (inquire->unit->value.integer)); + goto cleanup; + } + + if (gfc_pure (NULL)) + { + gfc_error ("INQUIRE statement not allowed in PURE procedure at %C"); + goto cleanup; + } + + gfc_unset_implicit_pure (NULL); + + if (inquire->id != NULL && inquire->pending == NULL) + { + gfc_error ("INQUIRE statement at %L requires a PENDING= specifier with " + "the ID= specifier", &loc); + goto cleanup; + } + + new_st.op = EXEC_INQUIRE; + new_st.ext.inquire = inquire; + return MATCH_YES; + +syntax: + gfc_syntax_error (ST_INQUIRE); + +cleanup: + gfc_free_inquire (inquire); + return MATCH_ERROR; +} + + +/* Resolve everything in a gfc_inquire structure. */ + +bool +gfc_resolve_inquire (gfc_inquire *inquire) +{ + RESOLVE_TAG (&tag_unit, inquire->unit); + RESOLVE_TAG (&tag_file, inquire->file); + RESOLVE_TAG (&tag_id, inquire->id); + + /* For INQUIRE, all tags except FILE, ID and UNIT are variable definition + contexts. Thus, use an extended RESOLVE_TAG macro for that. */ +#define INQUIRE_RESOLVE_TAG(tag, expr) \ + RESOLVE_TAG (tag, expr); \ + if (expr) \ + { \ + char context[64]; \ + sprintf (context, _("%s tag with INQUIRE"), (tag)->name); \ + if (gfc_check_vardef_context ((expr), false, false, false, \ + context) == false) \ + return false; \ + } + INQUIRE_RESOLVE_TAG (&tag_iomsg, inquire->iomsg); + INQUIRE_RESOLVE_TAG (&tag_iostat, inquire->iostat); + INQUIRE_RESOLVE_TAG (&tag_exist, inquire->exist); + INQUIRE_RESOLVE_TAG (&tag_opened, inquire->opened); + INQUIRE_RESOLVE_TAG (&tag_number, inquire->number); + INQUIRE_RESOLVE_TAG (&tag_named, inquire->named); + INQUIRE_RESOLVE_TAG (&tag_name, inquire->name); + INQUIRE_RESOLVE_TAG (&tag_s_access, inquire->access); + INQUIRE_RESOLVE_TAG (&tag_sequential, inquire->sequential); + INQUIRE_RESOLVE_TAG (&tag_direct, inquire->direct); + INQUIRE_RESOLVE_TAG (&tag_s_form, inquire->form); + INQUIRE_RESOLVE_TAG (&tag_formatted, inquire->formatted); + INQUIRE_RESOLVE_TAG (&tag_unformatted, inquire->unformatted); + INQUIRE_RESOLVE_TAG (&tag_s_recl, inquire->recl); + INQUIRE_RESOLVE_TAG (&tag_nextrec, inquire->nextrec); + INQUIRE_RESOLVE_TAG (&tag_s_blank, inquire->blank); + INQUIRE_RESOLVE_TAG (&tag_s_position, inquire->position); + INQUIRE_RESOLVE_TAG (&tag_s_action, inquire->action); + INQUIRE_RESOLVE_TAG (&tag_read, inquire->read); + INQUIRE_RESOLVE_TAG (&tag_write, inquire->write); + INQUIRE_RESOLVE_TAG (&tag_readwrite, inquire->readwrite); + INQUIRE_RESOLVE_TAG (&tag_s_delim, inquire->delim); + INQUIRE_RESOLVE_TAG (&tag_s_pad, inquire->pad); + INQUIRE_RESOLVE_TAG (&tag_s_encoding, inquire->encoding); + INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round); + INQUIRE_RESOLVE_TAG (&tag_iolength, inquire->iolength); + INQUIRE_RESOLVE_TAG (&tag_convert, inquire->convert); + INQUIRE_RESOLVE_TAG (&tag_strm_out, inquire->strm_pos); + INQUIRE_RESOLVE_TAG (&tag_s_async, inquire->asynchronous); + INQUIRE_RESOLVE_TAG (&tag_s_sign, inquire->sign); + INQUIRE_RESOLVE_TAG (&tag_s_round, inquire->round); + INQUIRE_RESOLVE_TAG (&tag_pending, inquire->pending); + INQUIRE_RESOLVE_TAG (&tag_size, inquire->size); + INQUIRE_RESOLVE_TAG (&tag_s_decimal, inquire->decimal); + INQUIRE_RESOLVE_TAG (&tag_s_iqstream, inquire->iqstream); + INQUIRE_RESOLVE_TAG (&tag_v_share, inquire->share); + INQUIRE_RESOLVE_TAG (&tag_v_cc, inquire->cc); +#undef INQUIRE_RESOLVE_TAG + + if (!gfc_reference_st_label (inquire->err, ST_LABEL_TARGET)) + return false; + + return true; +} + + +void +gfc_free_wait (gfc_wait *wait) +{ + if (wait == NULL) + return; + + gfc_free_expr (wait->unit); + gfc_free_expr (wait->iostat); + gfc_free_expr (wait->iomsg); + gfc_free_expr (wait->id); + free (wait); +} + + +bool +gfc_resolve_wait (gfc_wait *wait) +{ + RESOLVE_TAG (&tag_unit, wait->unit); + RESOLVE_TAG (&tag_iomsg, wait->iomsg); + RESOLVE_TAG (&tag_iostat, wait->iostat); + RESOLVE_TAG (&tag_id, wait->id); + + if (!gfc_reference_st_label (wait->err, ST_LABEL_TARGET)) + return false; + + if (!gfc_reference_st_label (wait->end, ST_LABEL_TARGET)) + return false; + + return true; +} + +/* Match an element of a WAIT statement. */ + +#define RETM if (m != MATCH_NO) return m; + +static match +match_wait_element (gfc_wait *wait) +{ + match m; + + m = match_etag (&tag_unit, &wait->unit); + RETM m = match_ltag (&tag_err, &wait->err); + RETM m = match_ltag (&tag_end, &wait->end); + RETM m = match_ltag (&tag_eor, &wait->eor); + RETM m = match_etag (&tag_iomsg, &wait->iomsg); + if (m == MATCH_YES && !check_char_variable (wait->iomsg)) + return MATCH_ERROR; + RETM m = match_out_tag (&tag_iostat, &wait->iostat); + RETM m = match_etag (&tag_id, &wait->id); + RETM return MATCH_NO; +} + +#undef RETM + + +match +gfc_match_wait (void) +{ + gfc_wait *wait; + match m; + + m = gfc_match_char ('('); + if (m == MATCH_NO) + return m; + + wait = XCNEW (gfc_wait); + + m = match_wait_element (wait); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + { + m = gfc_match_expr (&wait->unit); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + for (;;) + { + if (gfc_match_char (')') == MATCH_YES) + break; + if (gfc_match_char (',') != MATCH_YES) + goto syntax; + + m = match_wait_element (wait); + if (m == MATCH_ERROR) + goto cleanup; + if (m == MATCH_NO) + goto syntax; + } + + if (!gfc_notify_std (GFC_STD_F2003, "WAIT at %C " + "not allowed in Fortran 95")) + goto cleanup; + + if (gfc_pure (NULL)) + { + gfc_error ("WAIT statement not allowed in PURE procedure at %C"); + goto cleanup; + } + + gfc_unset_implicit_pure (NULL); + + new_st.op = EXEC_WAIT; + new_st.ext.wait = wait; + + return MATCH_YES; + +syntax: + gfc_syntax_error (ST_WAIT); + +cleanup: + gfc_free_wait (wait); + return MATCH_ERROR; +}