| /* Deal with I/O statements & related stuff. |
| Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 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 2, 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 COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "flags.h" |
| #include "gfortran.h" |
| #include "match.h" |
| #include "parse.h" |
| |
| gfc_st_label format_asterisk = |
| { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0, |
| {NULL, NULL}, NULL, NULL}; |
| |
| typedef struct |
| { |
| const char *name, *spec; |
| bt type; |
| } |
| io_tag; |
| |
| static const io_tag |
| 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_unit = {"UNIT", " unit = %e", BT_INTEGER}, |
| tag_advance = {"ADVANCE", " advance = %e", BT_CHARACTER}, |
| tag_rec = {"REC", " rec = %e", BT_INTEGER}, |
| tag_format = {"FORMAT", NULL, 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_iolength = {"IOLENGTH", " iolength = %v", BT_INTEGER}, |
| tag_err = {"ERR", " err = %l", BT_UNKNOWN}, |
| tag_end = {"END", " end = %l", BT_UNKNOWN}, |
| tag_eor = {"EOR", " eor = %l", BT_UNKNOWN}; |
| |
| static gfc_dt *current_dt; |
| |
| #define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE; |
| |
| |
| /**************** Fortran 95 FORMAT parser *****************/ |
| |
| /* FORMAT tokens returned by format_lex(). */ |
| typedef enum |
| { |
| FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD, |
| FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN, |
| FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F, |
| FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END |
| } |
| format_token; |
| |
| /* Local variables for checking format strings. The saved_token is |
| used to back up by a single format token during the parsing |
| process. */ |
| static char *format_string; |
| static int format_length, use_last_char; |
| |
| 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 (int in_string) |
| { |
| static char 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 (mode == MODE_COPY) |
| *format_string++ = c; |
| } |
| |
| c = TOUPPER (c); |
| return c; |
| } |
| |
| |
| /* Back up one character position. Only works once. */ |
| |
| static void |
| unget_char (void) |
| { |
| |
| use_last_char = 1; |
| } |
| |
| 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; |
| } |
| |
| do |
| { |
| c = next_char (0); |
| } |
| while (gfc_is_whitespace (c)); |
| |
| negative_flag = 0; |
| switch (c) |
| { |
| case '-': |
| negative_flag = 1; |
| case '+': |
| c = next_char (0); |
| if (!ISDIGIT (c)) |
| { |
| token = FMT_UNKNOWN; |
| break; |
| } |
| |
| value = c - '0'; |
| |
| do |
| { |
| c = next_char (0); |
| 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 (0); |
| if (c != '0') |
| zflag = 0; |
| if (ISDIGIT (c)) |
| value = 10 * value + c - '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 (0); |
| if (c != 'L' && c != 'R') |
| unget_char (); |
| |
| token = FMT_POS; |
| break; |
| |
| case '(': |
| token = FMT_LPAREN; |
| break; |
| |
| case ')': |
| token = FMT_RPAREN; |
| break; |
| |
| case 'X': |
| token = FMT_X; |
| break; |
| |
| case 'S': |
| c = next_char (0); |
| if (c != 'P' && c != 'S') |
| unget_char (); |
| |
| token = FMT_SIGN; |
| break; |
| |
| case 'B': |
| c = next_char (0); |
| 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 (1); |
| if (c == '\0') |
| { |
| token = FMT_END; |
| break; |
| } |
| |
| if (c == delim) |
| { |
| c = next_char (1); |
| |
| 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 (0); |
| if (c == 'N' || c == 'S') |
| token = FMT_EXT; |
| 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': |
| token = FMT_D; |
| break; |
| |
| case '\0': |
| token = FMT_END; |
| break; |
| |
| default: |
| token = FMT_UNKNOWN; |
| break; |
| } |
| |
| return token; |
| } |
| |
| |
| /* 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 try |
| check_format (void) |
| { |
| const char *posint_required = "Positive width required"; |
| const char *period_required = "Period required"; |
| const char *nonneg_required = "Nonnegative width required"; |
| const char *unexpected_element = "Unexpected element"; |
| const char *unexpected_end = "Unexpected end of format string"; |
| |
| const char *error; |
| format_token t, u; |
| int level; |
| int repeat; |
| try rv; |
| |
| use_last_char = 0; |
| saved_token = FMT_NONE; |
| level = 0; |
| repeat = 0; |
| rv = SUCCESS; |
| |
| t = format_lex (); |
| if (t != FMT_LPAREN) |
| { |
| error = "Missing leading left parenthesis"; |
| goto syntax; |
| } |
| |
| t = format_lex (); |
| 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 (); |
| switch (t) |
| { |
| case FMT_POSINT: |
| repeat = value; |
| t = format_lex (); |
| 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: |
| /* Signed integer can only precede a P format. */ |
| t = format_lex (); |
| 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 (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor " |
| "requires leading space count at %C") |
| == FAILURE) |
| return FAILURE; |
| goto between_desc; |
| |
| case FMT_SIGN: |
| case FMT_BLANK: |
| 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 (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C") |
| == FAILURE) |
| return FAILURE; |
| if (t != FMT_RPAREN || level > 0) |
| { |
| error = "$ must the last specifier"; |
| goto syntax; |
| } |
| |
| goto finished; |
| |
| case FMT_POS: |
| case FMT_IBOZ: |
| case FMT_F: |
| case FMT_E: |
| case FMT_EXT: |
| case FMT_G: |
| case FMT_L: |
| case FMT_A: |
| case FMT_D: |
| goto data_desc; |
| |
| case FMT_H: |
| 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_X: |
| break; |
| |
| case FMT_P: |
| if (pedantic) |
| { |
| t = format_lex (); |
| if (t == FMT_POSINT) |
| { |
| error = "Repeat count cannot follow P descriptor"; |
| goto syntax; |
| } |
| |
| saved_token = t; |
| } |
| |
| goto optional_comma; |
| |
| case FMT_POS: |
| case FMT_L: |
| t = format_lex (); |
| if (t == FMT_POSINT) |
| break; |
| |
| error = posint_required; |
| goto syntax; |
| |
| case FMT_A: |
| t = format_lex (); |
| if (t != FMT_POSINT) |
| saved_token = t; |
| break; |
| |
| case FMT_D: |
| case FMT_E: |
| case FMT_G: |
| case FMT_EXT: |
| u = format_lex (); |
| if (u != FMT_POSINT) |
| { |
| error = posint_required; |
| goto syntax; |
| } |
| |
| u = format_lex (); |
| if (u != FMT_PERIOD) |
| { |
| error = period_required; |
| goto syntax; |
| } |
| |
| u = format_lex (); |
| 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_E) |
| { |
| saved_token = u; |
| } |
| else |
| { |
| u = format_lex (); |
| if (u != FMT_POSINT) |
| { |
| error = "Positive exponent width required"; |
| goto syntax; |
| } |
| } |
| |
| break; |
| |
| case FMT_F: |
| t = format_lex (); |
| if (t != FMT_ZERO && t != FMT_POSINT) |
| { |
| error = nonneg_required; |
| goto syntax; |
| } |
| |
| t = format_lex (); |
| if (t != FMT_PERIOD) |
| { |
| error = period_required; |
| goto syntax; |
| } |
| |
| t = format_lex (); |
| if (t != FMT_ZERO && t != FMT_POSINT) |
| { |
| error = nonneg_required; |
| goto syntax; |
| } |
| |
| break; |
| |
| case FMT_H: |
| if(mode == MODE_STRING) |
| { |
| format_string += value; |
| format_length -= value; |
| } |
| else |
| { |
| while(repeat >0) |
| { |
| next_char(1); |
| repeat -- ; |
| } |
| } |
| break; |
| |
| case FMT_IBOZ: |
| t = format_lex (); |
| if (t != FMT_ZERO && t != FMT_POSINT) |
| { |
| error = nonneg_required; |
| goto syntax; |
| } |
| |
| t = format_lex (); |
| if (t != FMT_PERIOD) |
| { |
| saved_token = t; |
| } |
| else |
| { |
| t = format_lex (); |
| 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 (); |
| 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: |
| error = "Missing comma"; |
| goto syntax; |
| } |
| |
| optional_comma: |
| /* Optional comma is a weird between state where we've just finished |
| reading a colon, slash or P descriptor. */ |
| t = format_lex (); |
| 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 (); |
| 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 (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C") |
| == FAILURE) |
| return FAILURE; |
| saved_token = t; |
| break; |
| } |
| |
| goto format_item; |
| |
| syntax: |
| /* Something went wrong. If the format we're checking is a string, |
| generate a warning, since the program is correct. If the format |
| is in a FORMAT statement, this messes up parsing, which is an |
| error. */ |
| if (mode != MODE_STRING) |
| gfc_error ("%s in format string at %C", error); |
| else |
| { |
| gfc_warning ("%s in format string at %C", error); |
| |
| /* TODO: More elaborate measures are needed to show where a problem |
| is within a format string that has been calculated. */ |
| } |
| |
| rv = FAILURE; |
| |
| finished: |
| return rv; |
| } |
| |
| |
| /* Given an expression node that is a constant string, see if it looks |
| like a format string. */ |
| |
| static void |
| check_format_string (gfc_expr * e) |
| { |
| |
| mode = MODE_STRING; |
| format_string = e->value.character.string; |
| check_format (); |
| } |
| |
| |
| /************ Fortran 95 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_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 () == FAILURE) |
| 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_expr(); |
| e->expr_type = EXPR_CONSTANT; |
| e->ts.type = BT_CHARACTER; |
| e->ts.kind = gfc_default_character_kind; |
| e->where = start; |
| e->value.character.string = format_string = gfc_getmem(format_length+1); |
| e->value.character.length = format_length; |
| gfc_statement_label->format = e; |
| |
| mode = MODE_COPY; |
| check_format (); /* Guaranteed to succeed */ |
| gfc_match_eos (); /* Guaranteed to succeed */ |
| |
| return MATCH_YES; |
| } |
| |
| |
| /* 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, &result); |
| if (m != MATCH_YES) |
| return m; |
| |
| 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, &result); |
| if (m != MATCH_YES) |
| return m; |
| |
| 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 tag cannot be INTENT(IN) at %C"); |
| gfc_free_expr (result); |
| return MATCH_ERROR; |
| } |
| |
| if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym)) |
| { |
| gfc_error ("Variable tag cannot be assigned in PURE procedure at %C"); |
| gfc_free_expr (result); |
| return MATCH_ERROR; |
| } |
| |
| *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, label); |
| if (m == MATCH_YES && old != 0) |
| { |
| gfc_error ("Duplicate %s label specification at %C", tag->name); |
| return MATCH_ERROR; |
| } |
| |
| return m; |
| } |
| |
| |
| /* Do expression resolution and type-checking on an expression tag. */ |
| |
| static try |
| resolve_tag (const io_tag * tag, gfc_expr * e) |
| { |
| |
| if (e == NULL) |
| return SUCCESS; |
| |
| if (gfc_resolve_expr (e) == FAILURE) |
| return FAILURE; |
| |
| if (e->ts.type != tag->type) |
| { |
| /* Format label can be integer varibale. */ |
| if (tag != &tag_format || e->ts.type != BT_INTEGER) |
| { |
| gfc_error ("%s tag at %L must be of type %s or %s", tag->name, |
| &e->where, gfc_basic_typename (tag->type), |
| gfc_basic_typename (BT_INTEGER)); |
| return FAILURE; |
| } |
| } |
| |
| if (tag == &tag_format) |
| { |
| if (e->rank != 1 && e->rank != 0) |
| { |
| gfc_error ("FORMAT tag at %L cannot be array of strings", |
| &e->where); |
| return FAILURE; |
| } |
| /* Check assigned label. */ |
| if (e->expr_type == EXPR_VARIABLE && e->ts.type == BT_INTEGER |
| && e->symtree->n.sym->attr.assign != 1) |
| { |
| gfc_error ("Variable '%s' has not been assigned a format label at %L", |
| e->symtree->n.sym->name, &e->where); |
| return FAILURE; |
| } |
| } |
| else |
| { |
| if (e->rank != 0) |
| { |
| gfc_error ("%s tag at %L must be scalar", tag->name, &e->where); |
| return FAILURE; |
| } |
| } |
| |
| return SUCCESS; |
| } |
| |
| |
| /* Match a single tag of an OPEN statement. */ |
| |
| static match |
| match_open_element (gfc_open * open) |
| { |
| match m; |
| |
| m = match_etag (&tag_unit, &open->unit); |
| 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_ltag (&tag_err, &open->err); |
| 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->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 (open); |
| } |
| |
| |
| /* Resolve everything in a gfc_open structure. */ |
| |
| try |
| gfc_resolve_open (gfc_open * open) |
| { |
| |
| RESOLVE_TAG (&tag_unit, open->unit); |
| RESOLVE_TAG (&tag_iostat, open->iostat); |
| RESOLVE_TAG (&tag_file, open->file); |
| RESOLVE_TAG (&tag_status, open->status); |
| 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); |
| |
| if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| return SUCCESS; |
| } |
| |
| |
| /* Match an OPEN statement. */ |
| |
| match |
| gfc_match_open (void) |
| { |
| gfc_open *open; |
| match m; |
| |
| m = gfc_match_char ('('); |
| if (m == MATCH_NO) |
| return m; |
| |
| open = gfc_getmem (sizeof (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_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_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; |
| } |
| |
| 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->iostat); |
| gfc_free_expr (close->status); |
| |
| gfc_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_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; |
| |
| m = gfc_match_char ('('); |
| if (m == MATCH_NO) |
| return m; |
| |
| close = gfc_getmem (sizeof (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; |
| } |
| |
| 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. */ |
| |
| try |
| gfc_resolve_close (gfc_close * close) |
| { |
| |
| RESOLVE_TAG (&tag_unit, close->unit); |
| RESOLVE_TAG (&tag_iostat, close->iostat); |
| RESOLVE_TAG (&tag_status, close->status); |
| |
| if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| return SUCCESS; |
| } |
| |
| |
| /* Free a gfc_filepos structure. */ |
| |
| void |
| gfc_free_filepos (gfc_filepos * fp) |
| { |
| |
| gfc_free_expr (fp->unit); |
| gfc_free_expr (fp->iostat); |
| gfc_free (fp); |
| } |
| |
| |
| /* Match elements of a REWIND, BACKSPACE or ENDFILE 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_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 or ENDFILE. */ |
| |
| static match |
| match_filepos (gfc_statement st, gfc_exec_op op) |
| { |
| gfc_filepos *fp; |
| match m; |
| |
| fp = gfc_getmem (sizeof (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) |
| goto done; |
| if (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; |
| } |
| |
| 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; |
| } |
| |
| |
| try |
| gfc_resolve_filepos (gfc_filepos * fp) |
| { |
| |
| RESOLVE_TAG (&tag_unit, fp->unit); |
| if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| return SUCCESS; |
| } |
| |
| |
| /* Match the file positioning statements: ENDFILE, BACKSPACE or |
| REWIND. */ |
| |
| 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); |
| } |
| |
| |
| /******************** Data Transfer Statements *********************/ |
| |
| typedef enum |
| { M_READ, M_WRITE, M_PRINT, M_INQUIRE } |
| io_kind; |
| |
| |
| /* 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_int_expr (unit); |
| } |
| |
| |
| /* Match a unit specification for a data transfer statement. */ |
| |
| static match |
| match_dt_unit (io_kind k, gfc_dt * dt) |
| { |
| gfc_expr *e; |
| |
| if (gfc_match_char ('*') == MATCH_YES) |
| { |
| if (dt->io_unit != NULL) |
| goto conflict; |
| |
| dt->io_unit = default_unit (k); |
| 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; |
| |
| 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 (gfc_match_st_label (&label, 0) == MATCH_YES) |
| { |
| 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) == FAILURE) |
| return MATCH_ERROR; |
| |
| dt->format_label = label; |
| return MATCH_YES; |
| } |
| |
| 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; |
| } |
| |
| |
| /* 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 '%s' in namelist '%s' 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 '%s' 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_rec, &dt->rec); |
| 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_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) |
| 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->iostat); |
| gfc_free_expr (dt->size); |
| |
| gfc_free (dt); |
| } |
| |
| |
| /* Resolve everything in a gfc_dt structure. */ |
| |
| try |
| gfc_resolve_dt (gfc_dt * dt) |
| { |
| gfc_expr *e; |
| |
| RESOLVE_TAG (&tag_format, dt->format_expr); |
| RESOLVE_TAG (&tag_rec, dt->rec); |
| RESOLVE_TAG (&tag_advance, dt->advance); |
| RESOLVE_TAG (&tag_iostat, dt->iostat); |
| RESOLVE_TAG (&tag_size, dt->size); |
| |
| e = dt->io_unit; |
| if (gfc_resolve_expr (e) == SUCCESS |
| && (e->ts.type != BT_INTEGER |
| && (e->ts.type != BT_CHARACTER |
| || e->expr_type != EXPR_VARIABLE))) |
| { |
| gfc_error |
| ("UNIT specification at %L must be an INTEGER expression or a " |
| "CHARACTER variable", &e->where); |
| return FAILURE; |
| } |
| |
| /* Sanity checks on data transfer statements. */ |
| if (e->ts.type == BT_CHARACTER) |
| { |
| if (dt->rec != NULL) |
| { |
| gfc_error ("REC tag at %L is incompatible with internal file", |
| &dt->rec->where); |
| return FAILURE; |
| } |
| |
| if (dt->namelist != NULL) |
| { |
| gfc_error ("Internal file at %L is incompatible with namelist", |
| &dt->io_unit->where); |
| return FAILURE; |
| } |
| |
| if (dt->advance != NULL) |
| { |
| gfc_error ("ADVANCE tag at %L is incompatible with internal file", |
| &dt->advance->where); |
| return FAILURE; |
| } |
| } |
| |
| if (dt->rec != NULL) |
| { |
| if (dt->end != NULL) |
| { |
| gfc_error ("REC tag at %L is incompatible with END tag", |
| &dt->rec->where); |
| return FAILURE; |
| } |
| |
| if (dt->format_label == &format_asterisk) |
| { |
| gfc_error |
| ("END tag at %L is incompatible with list directed format (*)", |
| &dt->end_where); |
| return FAILURE; |
| } |
| |
| if (dt->namelist != NULL) |
| { |
| gfc_error ("REC tag at %L is incompatible with namelist", |
| &dt->rec->where); |
| return FAILURE; |
| } |
| } |
| |
| if (dt->advance != NULL && dt->format_label == &format_asterisk) |
| { |
| gfc_error ("ADVANCE tag at %L is incompatible with list directed " |
| "format (*)", &dt->advance->where); |
| return FAILURE; |
| } |
| |
| if (dt->eor != 0 && dt->advance == NULL) |
| { |
| gfc_error ("EOR tag at %L requires an ADVANCE tag", &dt->eor_where); |
| return FAILURE; |
| } |
| |
| if (dt->size != NULL && dt->advance == NULL) |
| { |
| gfc_error ("SIZE tag at %L requires an ADVANCE tag", &dt->size->where); |
| return FAILURE; |
| } |
| |
| /* TODO: Make sure the ADVANCE tag is 'yes' or 'no' if it is a string |
| constant. */ |
| |
| if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| /* 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, |
| &dt->format_label->where); |
| return FAILURE; |
| } |
| return SUCCESS; |
| } |
| |
| |
| /* 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 k, gfc_code **); |
| |
| static match |
| match_io_iterator (io_kind k, gfc_code ** result) |
| { |
| gfc_code *head, *tail, *new; |
| 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); |
| if (m == MATCH_ERROR) |
| goto cleanup; |
| if (m == MATCH_NO) |
| { |
| if (n > 2) |
| goto syntax; |
| goto cleanup; |
| } |
| |
| tail = gfc_append_code (tail, new); |
| |
| 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 = gfc_get_code (); |
| new->op = EXEC_DO; |
| new->ext.iterator = iter; |
| |
| new->block = gfc_get_code (); |
| new->block->op = EXEC_DO; |
| new->block->next = head; |
| |
| *result = new; |
| 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) |
| switch (k) |
| { |
| case M_READ: |
| if (expr->symtree->n.sym->attr.intent == INTENT_IN) |
| { |
| gfc_error |
| ("Variable '%s' in input list at %C cannot be INTENT(IN)", |
| expr->symtree->n.sym->name); |
| m = MATCH_ERROR; |
| } |
| |
| if (gfc_pure (NULL) |
| && gfc_impure_variable (expr->symtree->n.sym) |
| && current_dt->io_unit->ts.type == BT_CHARACTER) |
| { |
| gfc_error ("Cannot read to variable '%s' in PURE procedure at %C", |
| expr->symtree->n.sym->name); |
| m = MATCH_ERROR; |
| } |
| |
| if (gfc_check_do_variable (expr->symtree)) |
| m = MATCH_ERROR; |
| |
| break; |
| |
| case M_WRITE: |
| if (current_dt->io_unit->ts.type == BT_CHARACTER |
| && gfc_pure (NULL) |
| && current_dt->io_unit->expr_type == EXPR_VARIABLE |
| && gfc_impure_variable (current_dt->io_unit->symtree->n.sym)) |
| { |
| gfc_error |
| ("Cannot write to internal file unit '%s' at %C inside a " |
| "PURE procedure", current_dt->io_unit->symtree->n.sym->name); |
| m = MATCH_ERROR; |
| } |
| |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (m != MATCH_YES) |
| { |
| gfc_free_expr (expr); |
| return MATCH_ERROR; |
| } |
| |
| cp = gfc_get_code (); |
| cp->op = EXEC_TRANSFER; |
| cp->expr = expr; |
| |
| *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; |
| match m; |
| |
| *head_p = head = tail = NULL; |
| if (gfc_match_eos () == MATCH_YES) |
| return MATCH_YES; |
| |
| for (;;) |
| { |
| m = match_io_element (k, &new); |
| if (m == MATCH_ERROR) |
| goto cleanup; |
| if (m == MATCH_NO) |
| goto syntax; |
| |
| tail = gfc_append_code (tail, new); |
| if (head == NULL) |
| head = new; |
| |
| 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; |
| |
| c = gfc_get_code (); |
| c->op = EXEC_DT_END; |
| |
| /* Point to structure that is already there */ |
| c->ext.dt = new_st.ext.dt; |
| gfc_append_code (io_code, c); |
| } |
| |
| |
| /* 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; |
| gfc_expr *expr; |
| int comma_flag, c; |
| locus where; |
| gfc_dt *dt; |
| match m; |
| |
| comma_flag = 0; |
| current_dt = dt = gfc_getmem (sizeof (gfc_dt)); |
| |
| if (gfc_match_char ('(') == MATCH_NO) |
| { |
| if (k == M_WRITE) |
| goto syntax; |
| |
| if (gfc_current_form == FORM_FREE) |
| { |
| c = gfc_peek_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; |
| } |
| |
| /* 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; |
| |
| if (gfc_match_name (name) == MATCH_YES |
| && !gfc_find_symbol (name, NULL, 1, &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: |
| /* Optional leading comma (non-standard). */ |
| if (!comma_flag |
| && gfc_match_char (',') == MATCH_YES |
| && k == M_WRITE |
| && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output " |
| "item list at %C is an extension") == FAILURE) |
| return MATCH_ERROR; |
| |
| 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; |
| } |
| |
| /* A full IO statement has been matched. */ |
| if (dt->io_unit->expr_type == EXPR_VARIABLE |
| && k == M_WRITE |
| && dt->io_unit->ts.type == BT_CHARACTER |
| && dt->io_unit->symtree->n.sym->attr.intent == INTENT_IN) |
| { |
| gfc_error ("Internal file '%s' at %L is INTENT(IN)", |
| dt->io_unit->symtree->n.sym->name, &dt->io_unit->where); |
| m = MATCH_ERROR; |
| goto cleanup; |
| } |
| |
| expr = dt->format_expr; |
| |
| if (expr != NULL && expr->expr_type == EXPR_CONSTANT) |
| check_format_string (expr); |
| |
| if (gfc_pure (NULL) |
| && (k == M_READ || k == M_WRITE) |
| && dt->io_unit->ts.type != BT_CHARACTER) |
| { |
| gfc_error |
| ("io-unit in %s statement at %C must be an internal file in a " |
| "PURE procedure", io_kind_name (k)); |
| m = MATCH_ERROR; |
| goto cleanup; |
| } |
| |
| new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE; |
| new_st.ext.dt = dt; |
| new_st.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; |
| } |
| |
| 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->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->pad); |
| gfc_free_expr (inquire->iolength); |
| |
| gfc_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_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_delim, &inquire->delim); |
| RETM m = match_vtag (&tag_s_pad, &inquire->pad); |
| RETM m = match_vtag (&tag_iolength, &inquire->iolength); |
| 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 = gfc_getmem (sizeof (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; |
| |
| terminate_io (code); |
| |
| new_st.op = EXEC_IOLENGTH; |
| new_st.expr = 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; |
| } |
| |
| new_st.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 (gfc_pure (NULL)) |
| { |
| gfc_error ("INQUIRE statement not allowed in PURE procedure at %C"); |
| 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. */ |
| |
| try |
| gfc_resolve_inquire (gfc_inquire * inquire) |
| { |
| |
| RESOLVE_TAG (&tag_unit, inquire->unit); |
| RESOLVE_TAG (&tag_file, inquire->file); |
| RESOLVE_TAG (&tag_iostat, inquire->iostat); |
| RESOLVE_TAG (&tag_exist, inquire->exist); |
| RESOLVE_TAG (&tag_opened, inquire->opened); |
| RESOLVE_TAG (&tag_number, inquire->number); |
| RESOLVE_TAG (&tag_named, inquire->named); |
| RESOLVE_TAG (&tag_name, inquire->name); |
| RESOLVE_TAG (&tag_s_access, inquire->access); |
| RESOLVE_TAG (&tag_sequential, inquire->sequential); |
| RESOLVE_TAG (&tag_direct, inquire->direct); |
| RESOLVE_TAG (&tag_s_form, inquire->form); |
| RESOLVE_TAG (&tag_formatted, inquire->formatted); |
| RESOLVE_TAG (&tag_unformatted, inquire->unformatted); |
| RESOLVE_TAG (&tag_s_recl, inquire->recl); |
| RESOLVE_TAG (&tag_nextrec, inquire->nextrec); |
| RESOLVE_TAG (&tag_s_blank, inquire->blank); |
| RESOLVE_TAG (&tag_s_position, inquire->position); |
| RESOLVE_TAG (&tag_s_action, inquire->action); |
| RESOLVE_TAG (&tag_read, inquire->read); |
| RESOLVE_TAG (&tag_write, inquire->write); |
| RESOLVE_TAG (&tag_readwrite, inquire->readwrite); |
| RESOLVE_TAG (&tag_s_delim, inquire->delim); |
| RESOLVE_TAG (&tag_s_pad, inquire->pad); |
| RESOLVE_TAG (&tag_iolength, inquire->iolength); |
| |
| if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE) |
| return FAILURE; |
| |
| return SUCCESS; |
| } |