| /* Character scanner. |
| Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
| 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, 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA. */ |
| |
| /* Set of subroutines to (ultimately) return the next character to the |
| various matching subroutines. This file's job is to read files and |
| build up lines that are parsed by the parser. This means that we |
| handle continuation lines and "include" lines. |
| |
| The first thing the scanner does is to load an entire file into |
| memory. We load the entire file into memory for a couple reasons. |
| The first is that we want to be able to deal with nonseekable input |
| (pipes, stdin) and there is a lot of backing up involved during |
| parsing. |
| |
| The second is that we want to be able to print the locus of errors, |
| and an error on line 999999 could conflict with something on line |
| one. Given nonseekable input, we've got to store the whole thing. |
| |
| One thing that helps are the column truncation limits that give us |
| an upper bound on the size of individual lines. We don't store the |
| truncated stuff. |
| |
| From the scanner's viewpoint, the higher level subroutines ask for |
| new characters and do a lot of jumping backwards. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "gfortran.h" |
| #include "toplev.h" |
| |
| /* Structure for holding module and include file search path. */ |
| typedef struct gfc_directorylist |
| { |
| char *path; |
| struct gfc_directorylist *next; |
| } |
| gfc_directorylist; |
| |
| /* List of include file search directories. */ |
| static gfc_directorylist *include_dirs; |
| |
| static gfc_file *file_head, *current_file; |
| |
| static int continue_flag, end_flag, openmp_flag; |
| static int continue_count, continue_line; |
| static locus openmp_locus; |
| |
| gfc_source_form gfc_current_form; |
| static gfc_linebuf *line_head, *line_tail; |
| |
| locus gfc_current_locus; |
| const char *gfc_source_file; |
| static FILE *gfc_src_file; |
| static char *gfc_src_preprocessor_lines[2]; |
| |
| extern int pedantic; |
| |
| /* Main scanner initialization. */ |
| |
| void |
| gfc_scanner_init_1 (void) |
| { |
| file_head = NULL; |
| line_head = NULL; |
| line_tail = NULL; |
| |
| continue_count = 0; |
| continue_line = 0; |
| |
| end_flag = 0; |
| } |
| |
| |
| /* Main scanner destructor. */ |
| |
| void |
| gfc_scanner_done_1 (void) |
| { |
| gfc_linebuf *lb; |
| gfc_file *f; |
| |
| while(line_head != NULL) |
| { |
| lb = line_head->next; |
| gfc_free(line_head); |
| line_head = lb; |
| } |
| |
| while(file_head != NULL) |
| { |
| f = file_head->next; |
| gfc_free(file_head->filename); |
| gfc_free(file_head); |
| file_head = f; |
| } |
| |
| } |
| |
| |
| /* Adds path to the list pointed to by list. */ |
| |
| void |
| gfc_add_include_path (const char *path) |
| { |
| gfc_directorylist *dir; |
| const char *p; |
| |
| p = path; |
| while (*p == ' ' || *p == '\t') /* someone might do 'gfortran "-I include"' */ |
| if (*p++ == '\0') |
| return; |
| |
| dir = include_dirs; |
| if (!dir) |
| { |
| dir = include_dirs = gfc_getmem (sizeof (gfc_directorylist)); |
| } |
| else |
| { |
| while (dir->next) |
| dir = dir->next; |
| |
| dir->next = gfc_getmem (sizeof (gfc_directorylist)); |
| dir = dir->next; |
| } |
| |
| dir->next = NULL; |
| dir->path = gfc_getmem (strlen (p) + 2); |
| strcpy (dir->path, p); |
| strcat (dir->path, "/"); /* make '/' last character */ |
| } |
| |
| |
| /* Release resources allocated for options. */ |
| |
| void |
| gfc_release_include_path (void) |
| { |
| gfc_directorylist *p; |
| |
| gfc_free (gfc_option.module_dir); |
| while (include_dirs != NULL) |
| { |
| p = include_dirs; |
| include_dirs = include_dirs->next; |
| gfc_free (p->path); |
| gfc_free (p); |
| } |
| } |
| |
| /* Opens file for reading, searching through the include directories |
| given if necessary. If the include_cwd argument is true, we try |
| to open the file in the current directory first. */ |
| |
| FILE * |
| gfc_open_included_file (const char *name, const bool include_cwd) |
| { |
| char *fullname; |
| gfc_directorylist *p; |
| FILE *f; |
| |
| if (IS_ABSOLUTE_PATH (name)) |
| return gfc_open_file (name); |
| |
| if (include_cwd) |
| { |
| f = gfc_open_file (name); |
| if (f != NULL) |
| return f; |
| } |
| |
| for (p = include_dirs; p; p = p->next) |
| { |
| fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
| strcpy (fullname, p->path); |
| strcat (fullname, name); |
| |
| f = gfc_open_file (fullname); |
| if (f != NULL) |
| return f; |
| } |
| |
| return NULL; |
| } |
| |
| /* Test to see if we're at the end of the main source file. */ |
| |
| int |
| gfc_at_end (void) |
| { |
| |
| return end_flag; |
| } |
| |
| |
| /* Test to see if we're at the end of the current file. */ |
| |
| int |
| gfc_at_eof (void) |
| { |
| |
| if (gfc_at_end ()) |
| return 1; |
| |
| if (line_head == NULL) |
| return 1; /* Null file */ |
| |
| if (gfc_current_locus.lb == NULL) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| /* Test to see if we're at the beginning of a new line. */ |
| |
| int |
| gfc_at_bol (void) |
| { |
| if (gfc_at_eof ()) |
| return 1; |
| |
| return (gfc_current_locus.nextc == gfc_current_locus.lb->line); |
| } |
| |
| |
| /* Test to see if we're at the end of a line. */ |
| |
| int |
| gfc_at_eol (void) |
| { |
| |
| if (gfc_at_eof ()) |
| return 1; |
| |
| return (*gfc_current_locus.nextc == '\0'); |
| } |
| |
| |
| /* Advance the current line pointer to the next line. */ |
| |
| void |
| gfc_advance_line (void) |
| { |
| if (gfc_at_end ()) |
| return; |
| |
| if (gfc_current_locus.lb == NULL) |
| { |
| end_flag = 1; |
| return; |
| } |
| |
| gfc_current_locus.lb = gfc_current_locus.lb->next; |
| |
| if (gfc_current_locus.lb != NULL) |
| gfc_current_locus.nextc = gfc_current_locus.lb->line; |
| else |
| { |
| gfc_current_locus.nextc = NULL; |
| end_flag = 1; |
| } |
| } |
| |
| |
| /* Get the next character from the input, advancing gfc_current_file's |
| locus. When we hit the end of the line or the end of the file, we |
| start returning a '\n' in order to complete the current statement. |
| No Fortran line conventions are implemented here. |
| |
| Requiring explicit advances to the next line prevents the parse |
| pointer from being on the wrong line if the current statement ends |
| prematurely. */ |
| |
| static int |
| next_char (void) |
| { |
| int c; |
| |
| if (gfc_current_locus.nextc == NULL) |
| return '\n'; |
| |
| c = (unsigned char) *gfc_current_locus.nextc++; |
| if (c == '\0') |
| { |
| gfc_current_locus.nextc--; /* Remain on this line. */ |
| c = '\n'; |
| } |
| |
| return c; |
| } |
| |
| /* Skip a comment. When we come here the parse pointer is positioned |
| immediately after the comment character. If we ever implement |
| compiler directives withing comments, here is where we parse the |
| directive. */ |
| |
| static void |
| skip_comment_line (void) |
| { |
| char c; |
| |
| do |
| { |
| c = next_char (); |
| } |
| while (c != '\n'); |
| |
| gfc_advance_line (); |
| } |
| |
| |
| /* Comment lines are null lines, lines containing only blanks or lines |
| on which the first nonblank line is a '!'. |
| Return true if !$ openmp conditional compilation sentinel was |
| seen. */ |
| |
| static bool |
| skip_free_comments (void) |
| { |
| locus start; |
| char c; |
| int at_bol; |
| |
| for (;;) |
| { |
| at_bol = gfc_at_bol (); |
| start = gfc_current_locus; |
| if (gfc_at_eof ()) |
| break; |
| |
| do |
| c = next_char (); |
| while (gfc_is_whitespace (c)); |
| |
| if (c == '\n') |
| { |
| gfc_advance_line (); |
| continue; |
| } |
| |
| if (c == '!') |
| { |
| /* If -fopenmp, we need to handle here 2 things: |
| 1) don't treat !$omp as comments, but directives |
| 2) handle OpenMP conditional compilation, where |
| !$ should be treated as 2 spaces (for initial lines |
| only if followed by space). */ |
| if (gfc_option.flag_openmp && at_bol) |
| { |
| locus old_loc = gfc_current_locus; |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'o' || c == 'O') |
| { |
| if (((c = next_char ()) == 'm' || c == 'M') |
| && ((c = next_char ()) == 'p' || c == 'P') |
| && ((c = next_char ()) == ' ' || continue_flag)) |
| { |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| if (c != '\n' && c != '!') |
| { |
| openmp_flag = 1; |
| openmp_locus = old_loc; |
| gfc_current_locus = start; |
| return false; |
| } |
| } |
| gfc_current_locus = old_loc; |
| next_char (); |
| c = next_char (); |
| } |
| if (continue_flag || c == ' ') |
| { |
| gfc_current_locus = old_loc; |
| next_char (); |
| openmp_flag = 0; |
| return true; |
| } |
| } |
| gfc_current_locus = old_loc; |
| } |
| skip_comment_line (); |
| continue; |
| } |
| |
| break; |
| } |
| |
| if (openmp_flag && at_bol) |
| openmp_flag = 0; |
| gfc_current_locus = start; |
| return false; |
| } |
| |
| |
| /* Skip comment lines in fixed source mode. We have the same rules as |
| in skip_free_comment(), except that we can have a 'c', 'C' or '*' |
| in column 1, and a '!' cannot be in column 6. Also, we deal with |
| lines with 'd' or 'D' in column 1, if the user requested this. */ |
| |
| static void |
| skip_fixed_comments (void) |
| { |
| locus start; |
| int col; |
| char c; |
| |
| if (! gfc_at_bol ()) |
| { |
| start = gfc_current_locus; |
| if (! gfc_at_eof ()) |
| { |
| do |
| c = next_char (); |
| while (gfc_is_whitespace (c)); |
| |
| if (c == '\n') |
| gfc_advance_line (); |
| else if (c == '!') |
| skip_comment_line (); |
| } |
| |
| if (! gfc_at_bol ()) |
| { |
| gfc_current_locus = start; |
| return; |
| } |
| } |
| |
| for (;;) |
| { |
| start = gfc_current_locus; |
| if (gfc_at_eof ()) |
| break; |
| |
| c = next_char (); |
| if (c == '\n') |
| { |
| gfc_advance_line (); |
| continue; |
| } |
| |
| if (c == '!' || c == 'c' || c == 'C' || c == '*') |
| { |
| /* If -fopenmp, we need to handle here 2 things: |
| 1) don't treat !$omp|c$omp|*$omp as comments, but directives |
| 2) handle OpenMP conditional compilation, where |
| !$|c$|*$ should be treated as 2 spaces if the characters |
| in columns 3 to 6 are valid fixed form label columns |
| characters. */ |
| if (gfc_option.flag_openmp) |
| { |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'o' || c == 'O') |
| { |
| if (((c = next_char ()) == 'm' || c == 'M') |
| && ((c = next_char ()) == 'p' || c == 'P')) |
| { |
| c = next_char (); |
| if (c != '\n' |
| && ((openmp_flag && continue_flag) |
| || c == ' ' || c == '0')) |
| { |
| c = next_char (); |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| if (c != '\n' && c != '!') |
| { |
| /* Canonicalize to *$omp. */ |
| *start.nextc = '*'; |
| openmp_flag = 1; |
| gfc_current_locus = start; |
| return; |
| } |
| } |
| } |
| } |
| else |
| { |
| int digit_seen = 0; |
| |
| for (col = 3; col < 6; col++, c = next_char ()) |
| if (c == ' ') |
| continue; |
| else if (c < '0' || c > '9') |
| break; |
| else |
| digit_seen = 1; |
| |
| if (col == 6 && c != '\n' |
| && ((continue_flag && !digit_seen) |
| || c == ' ' || c == '0')) |
| { |
| gfc_current_locus = start; |
| start.nextc[0] = ' '; |
| start.nextc[1] = ' '; |
| continue; |
| } |
| } |
| } |
| gfc_current_locus = start; |
| } |
| skip_comment_line (); |
| continue; |
| } |
| |
| if (gfc_option.flag_d_lines != -1 && (c == 'd' || c == 'D')) |
| { |
| if (gfc_option.flag_d_lines == 0) |
| { |
| skip_comment_line (); |
| continue; |
| } |
| else |
| *start.nextc = c = ' '; |
| } |
| |
| col = 1; |
| |
| while (gfc_is_whitespace (c)) |
| { |
| c = next_char (); |
| col++; |
| } |
| |
| if (c == '\n') |
| { |
| gfc_advance_line (); |
| continue; |
| } |
| |
| if (col != 6 && c == '!') |
| { |
| skip_comment_line (); |
| continue; |
| } |
| |
| break; |
| } |
| |
| openmp_flag = 0; |
| gfc_current_locus = start; |
| } |
| |
| |
| /* Skips the current line if it is a comment. */ |
| |
| void |
| gfc_skip_comments (void) |
| { |
| if (gfc_current_form == FORM_FREE) |
| skip_free_comments (); |
| else |
| skip_fixed_comments (); |
| } |
| |
| |
| /* Get the next character from the input, taking continuation lines |
| and end-of-line comments into account. This implies that comment |
| lines between continued lines must be eaten here. For higher-level |
| subroutines, this flattens continued lines into a single logical |
| line. The in_string flag denotes whether we're inside a character |
| context or not. */ |
| |
| int |
| gfc_next_char_literal (int in_string) |
| { |
| locus old_loc; |
| int i, c, prev_openmp_flag; |
| |
| continue_flag = 0; |
| |
| restart: |
| c = next_char (); |
| if (gfc_at_end ()) |
| { |
| continue_count = 0; |
| return c; |
| } |
| |
| if (gfc_current_form == FORM_FREE) |
| { |
| bool openmp_cond_flag; |
| |
| if (!in_string && c == '!') |
| { |
| if (openmp_flag |
| && memcmp (&gfc_current_locus, &openmp_locus, |
| sizeof (gfc_current_locus)) == 0) |
| goto done; |
| |
| /* This line can't be continued */ |
| do |
| { |
| c = next_char (); |
| } |
| while (c != '\n'); |
| |
| /* Avoid truncation warnings for comment ending lines. */ |
| gfc_current_locus.lb->truncated = 0; |
| |
| goto done; |
| } |
| |
| if (c != '&') |
| goto done; |
| |
| /* If the next nonblank character is a ! or \n, we've got a |
| continuation line. */ |
| old_loc = gfc_current_locus; |
| |
| c = next_char (); |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| |
| /* Character constants to be continued cannot have commentary |
| after the '&'. */ |
| |
| if (in_string && c != '\n') |
| { |
| gfc_current_locus = old_loc; |
| c = '&'; |
| goto done; |
| } |
| |
| if (c != '!' && c != '\n') |
| { |
| gfc_current_locus = old_loc; |
| c = '&'; |
| goto done; |
| } |
| |
| prev_openmp_flag = openmp_flag; |
| continue_flag = 1; |
| if (c == '!') |
| skip_comment_line (); |
| else |
| gfc_advance_line (); |
| |
| if (gfc_at_eof()) |
| goto not_continuation; |
| |
| /* We've got a continuation line. If we are on the very next line after |
| the last continuation, increment the continuation line count and |
| check whether the limit has been exceeded. */ |
| if (gfc_current_locus.lb->linenum == continue_line + 1) |
| { |
| if (++continue_count == gfc_option.max_continue_free) |
| { |
| if (gfc_notification_std (GFC_STD_GNU) |
| || pedantic) |
| gfc_warning ("Limit of %d continuations exceeded in statement at %C", |
| gfc_option.max_continue_free); |
| } |
| } |
| continue_line = gfc_current_locus.lb->linenum; |
| |
| /* Now find where it continues. First eat any comment lines. */ |
| openmp_cond_flag = skip_free_comments (); |
| |
| if (prev_openmp_flag != openmp_flag) |
| { |
| gfc_current_locus = old_loc; |
| openmp_flag = prev_openmp_flag; |
| c = '&'; |
| goto done; |
| } |
| |
| /* Now that we have a non-comment line, probe ahead for the |
| first non-whitespace character. If it is another '&', then |
| reading starts at the next character, otherwise we must back |
| up to where the whitespace started and resume from there. */ |
| |
| old_loc = gfc_current_locus; |
| |
| c = next_char (); |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| |
| if (openmp_flag) |
| { |
| for (i = 0; i < 5; i++, c = next_char ()) |
| { |
| gcc_assert (TOLOWER (c) == "!$omp"[i]); |
| if (i == 4) |
| old_loc = gfc_current_locus; |
| } |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| } |
| |
| if (c != '&') |
| { |
| if (in_string) |
| { |
| if (gfc_option.warn_ampersand) |
| gfc_warning_now ("Missing '&' in continued character constant at %C"); |
| gfc_current_locus.nextc--; |
| } |
| /* Both !$omp and !$ -fopenmp continuation lines have & on the |
| continuation line only optionally. */ |
| else if (openmp_flag || openmp_cond_flag) |
| gfc_current_locus.nextc--; |
| else |
| { |
| c = ' '; |
| gfc_current_locus = old_loc; |
| goto done; |
| } |
| } |
| } |
| else |
| { |
| /* Fixed form continuation. */ |
| if (!in_string && c == '!') |
| { |
| /* Skip comment at end of line. */ |
| do |
| { |
| c = next_char (); |
| } |
| while (c != '\n'); |
| |
| /* Avoid truncation warnings for comment ending lines. */ |
| gfc_current_locus.lb->truncated = 0; |
| } |
| |
| if (c != '\n') |
| goto done; |
| |
| prev_openmp_flag = openmp_flag; |
| continue_flag = 1; |
| old_loc = gfc_current_locus; |
| |
| gfc_advance_line (); |
| skip_fixed_comments (); |
| |
| /* See if this line is a continuation line. */ |
| if (openmp_flag != prev_openmp_flag) |
| { |
| openmp_flag = prev_openmp_flag; |
| goto not_continuation; |
| } |
| |
| if (!openmp_flag) |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (c != ' ') |
| goto not_continuation; |
| } |
| else |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (TOLOWER (c) != "*$omp"[i]) |
| goto not_continuation; |
| } |
| |
| c = next_char (); |
| if (c == '0' || c == ' ' || c == '\n') |
| goto not_continuation; |
| |
| /* We've got a continuation line. If we are on the very next line after |
| the last continuation, increment the continuation line count and |
| check whether the limit has been exceeded. */ |
| if (gfc_current_locus.lb->linenum == continue_line + 1) |
| { |
| if (++continue_count == gfc_option.max_continue_fixed) |
| { |
| if (gfc_notification_std (GFC_STD_GNU) |
| || pedantic) |
| gfc_warning ("Limit of %d continuations exceeded in statement at %C", |
| gfc_option.max_continue_fixed); |
| } |
| } |
| |
| if (continue_line < gfc_current_locus.lb->linenum) |
| continue_line = gfc_current_locus.lb->linenum; |
| } |
| |
| /* Ready to read first character of continuation line, which might |
| be another continuation line! */ |
| goto restart; |
| |
| not_continuation: |
| c = '\n'; |
| gfc_current_locus = old_loc; |
| |
| done: |
| if (c == '\n') |
| continue_count = 0; |
| continue_flag = 0; |
| return c; |
| } |
| |
| |
| /* Get the next character of input, folded to lowercase. In fixed |
| form mode, we also ignore spaces. When matcher subroutines are |
| parsing character literals, they have to call |
| gfc_next_char_literal(). */ |
| |
| int |
| gfc_next_char (void) |
| { |
| int c; |
| |
| do |
| { |
| c = gfc_next_char_literal (0); |
| } |
| while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
| |
| return TOLOWER (c); |
| } |
| |
| |
| int |
| gfc_peek_char (void) |
| { |
| locus old_loc; |
| int c; |
| |
| old_loc = gfc_current_locus; |
| c = gfc_next_char (); |
| gfc_current_locus = old_loc; |
| |
| return c; |
| } |
| |
| |
| /* Recover from an error. We try to get past the current statement |
| and get lined up for the next. The next statement follows a '\n' |
| or a ';'. We also assume that we are not within a character |
| constant, and deal with finding a '\'' or '"'. */ |
| |
| void |
| gfc_error_recovery (void) |
| { |
| char c, delim; |
| |
| if (gfc_at_eof ()) |
| return; |
| |
| for (;;) |
| { |
| c = gfc_next_char (); |
| if (c == '\n' || c == ';') |
| break; |
| |
| if (c != '\'' && c != '"') |
| { |
| if (gfc_at_eof ()) |
| break; |
| continue; |
| } |
| delim = c; |
| |
| for (;;) |
| { |
| c = next_char (); |
| |
| if (c == delim) |
| break; |
| if (c == '\n') |
| return; |
| if (c == '\\') |
| { |
| c = next_char (); |
| if (c == '\n') |
| return; |
| } |
| } |
| if (gfc_at_eof ()) |
| break; |
| } |
| } |
| |
| |
| /* Read ahead until the next character to be read is not whitespace. */ |
| |
| void |
| gfc_gobble_whitespace (void) |
| { |
| static int linenum = 0; |
| locus old_loc; |
| int c; |
| |
| do |
| { |
| old_loc = gfc_current_locus; |
| c = gfc_next_char_literal (0); |
| /* Issue a warning for nonconforming tabs. We keep track of the line |
| number because the Fortran matchers will often back up and the same |
| line will be scanned multiple times. */ |
| if (!gfc_option.warn_tabs && c == '\t') |
| { |
| #ifdef USE_MAPPED_LOCATION |
| int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); |
| #else |
| int cur_linenum = gfc_current_locus.lb->linenum; |
| #endif |
| if (cur_linenum != linenum) |
| { |
| linenum = cur_linenum; |
| gfc_warning_now ("Nonconforming tab character at %C"); |
| } |
| } |
| } |
| while (gfc_is_whitespace (c)); |
| |
| gfc_current_locus = old_loc; |
| } |
| |
| |
| /* Load a single line into pbuf. |
| |
| If pbuf points to a NULL pointer, it is allocated. |
| We truncate lines that are too long, unless we're dealing with |
| preprocessor lines or if the option -ffixed-line-length-none is set, |
| in which case we reallocate the buffer to fit the entire line, if |
| need be. |
| In fixed mode, we expand a tab that occurs within the statement |
| label region to expand to spaces that leave the next character in |
| the source region. |
| load_line returns whether the line was truncated. |
| |
| NOTE: The error machinery isn't available at this point, so we can't |
| easily report line and column numbers consistent with other |
| parts of gfortran. */ |
| |
| static int |
| load_line (FILE * input, char **pbuf, int *pbuflen) |
| { |
| static int linenum = 0, current_line = 1; |
| int c, maxlen, i, preprocessor_flag, buflen = *pbuflen; |
| int trunc_flag = 0, seen_comment = 0; |
| int seen_printable = 0, seen_ampersand = 0; |
| char *buffer; |
| |
| /* Determine the maximum allowed line length. |
| The default for free-form is GFC_MAX_LINE, for fixed-form or for |
| unknown form it is 72. Refer to the documentation in gfc_option_t. */ |
| if (gfc_current_form == FORM_FREE) |
| { |
| if (gfc_option.free_line_length == -1) |
| maxlen = GFC_MAX_LINE; |
| else |
| maxlen = gfc_option.free_line_length; |
| } |
| else if (gfc_current_form == FORM_FIXED) |
| { |
| if (gfc_option.fixed_line_length == -1) |
| maxlen = 72; |
| else |
| maxlen = gfc_option.fixed_line_length; |
| } |
| else |
| maxlen = 72; |
| |
| if (*pbuf == NULL) |
| { |
| /* Allocate the line buffer, storing its length into buflen. */ |
| if (maxlen > 0) |
| buflen = maxlen; |
| else |
| buflen = GFC_MAX_LINE; |
| |
| *pbuf = gfc_getmem (buflen + 1); |
| } |
| |
| i = 0; |
| buffer = *pbuf; |
| |
| preprocessor_flag = 0; |
| c = fgetc (input); |
| if (c == '#') |
| /* In order to not truncate preprocessor lines, we have to |
| remember that this is one. */ |
| preprocessor_flag = 1; |
| ungetc (c, input); |
| |
| for (;;) |
| { |
| c = fgetc (input); |
| |
| if (c == EOF) |
| break; |
| if (c == '\n') |
| { |
| /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ |
| if (gfc_current_form == FORM_FREE |
| && !seen_printable && seen_ampersand) |
| { |
| if (pedantic) |
| gfc_error_now |
| ("'&' not allowed by itself in line %d", current_line); |
| else |
| gfc_warning_now |
| ("'&' not allowed by itself in line %d", current_line); |
| } |
| break; |
| } |
| |
| if (c == '\r') |
| continue; /* Gobble characters. */ |
| if (c == '\0') |
| continue; |
| |
| /* Check for illegal use of ampersand. See F95 Standard 3.3.1.3. */ |
| if (c == '&') |
| seen_ampersand = 1; |
| |
| if ((c != ' ' && c != '&' && c != '!') || (c == '!' && !seen_ampersand)) |
| seen_printable = 1; |
| |
| if (gfc_current_form == FORM_FREE |
| && c == '!' && !seen_printable && seen_ampersand) |
| { |
| if (pedantic) |
| gfc_error_now ( |
| "'&' not allowed by itself with comment in line %d", current_line); |
| else |
| gfc_warning_now ( |
| "'&' not allowed by itself with comment in line %d", current_line); |
| seen_printable = 1; |
| } |
| |
| /* Is this a fixed-form comment? */ |
| if (gfc_current_form == FORM_FIXED && i == 0 |
| && (c == '*' || c == 'c' || c == 'd')) |
| seen_comment = 1; |
| |
| if (gfc_current_form == FORM_FIXED && c == '\t' && i <= 6) |
| { |
| if (!gfc_option.warn_tabs && seen_comment == 0 |
| && current_line != linenum) |
| { |
| linenum = current_line; |
| gfc_warning_now ( |
| "Nonconforming tab character in column 1 of line %d", linenum); |
| } |
| |
| while (i <= 6) |
| { |
| *buffer++ = ' '; |
| i++; |
| } |
| |
| continue; |
| } |
| |
| *buffer++ = c; |
| i++; |
| |
| if (maxlen == 0 || preprocessor_flag) |
| { |
| if (i >= buflen) |
| { |
| /* Reallocate line buffer to double size to hold the |
| overlong line. */ |
| buflen = buflen * 2; |
| *pbuf = xrealloc (*pbuf, buflen + 1); |
| buffer = (*pbuf)+i; |
| } |
| } |
| else if (i >= maxlen) |
| { |
| /* Truncate the rest of the line. */ |
| for (;;) |
| { |
| c = fgetc (input); |
| if (c == '\n' || c == EOF) |
| break; |
| |
| trunc_flag = 1; |
| } |
| |
| ungetc ('\n', input); |
| } |
| } |
| |
| /* Pad lines to the selected line length in fixed form. */ |
| if (gfc_current_form == FORM_FIXED |
| && gfc_option.fixed_line_length != 0 |
| && !preprocessor_flag |
| && c != EOF) |
| { |
| while (i++ < maxlen) |
| *buffer++ = ' '; |
| } |
| |
| *buffer = '\0'; |
| *pbuflen = buflen; |
| current_line++; |
| |
| return trunc_flag; |
| } |
| |
| |
| /* Get a gfc_file structure, initialize it and add it to |
| the file stack. */ |
| |
| static gfc_file * |
| get_file (const char *name, enum lc_reason reason ATTRIBUTE_UNUSED) |
| { |
| gfc_file *f; |
| |
| f = gfc_getmem (sizeof (gfc_file)); |
| |
| f->filename = gfc_getmem (strlen (name) + 1); |
| strcpy (f->filename, name); |
| |
| f->next = file_head; |
| file_head = f; |
| |
| f->included_by = current_file; |
| if (current_file != NULL) |
| f->inclusion_line = current_file->line; |
| |
| #ifdef USE_MAPPED_LOCATION |
| linemap_add (&line_table, reason, false, f->filename, 1); |
| #endif |
| |
| return f; |
| } |
| |
| /* Deal with a line from the C preprocessor. The |
| initial octothorp has already been seen. */ |
| |
| static void |
| preprocessor_line (char *c) |
| { |
| bool flag[5]; |
| int i, line; |
| char *filename; |
| gfc_file *f; |
| int escaped, unescape; |
| |
| c++; |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| if (*c < '0' || *c > '9') |
| goto bad_cpp_line; |
| |
| line = atoi (c); |
| |
| c = strchr (c, ' '); |
| if (c == NULL) |
| { |
| /* No file name given. Set new line number. */ |
| current_file->line = line; |
| return; |
| } |
| |
| /* Skip spaces. */ |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| /* Skip quote. */ |
| if (*c != '"') |
| goto bad_cpp_line; |
| ++c; |
| |
| filename = c; |
| |
| /* Make filename end at quote. */ |
| unescape = 0; |
| escaped = false; |
| while (*c && ! (! escaped && *c == '"')) |
| { |
| if (escaped) |
| escaped = false; |
| else if (*c == '\\') |
| { |
| escaped = true; |
| unescape++; |
| } |
| ++c; |
| } |
| |
| if (! *c) |
| /* Preprocessor line has no closing quote. */ |
| goto bad_cpp_line; |
| |
| *c++ = '\0'; |
| |
| /* Undo effects of cpp_quote_string. */ |
| if (unescape) |
| { |
| char *s = filename; |
| char *d = gfc_getmem (c - filename - unescape); |
| |
| filename = d; |
| while (*s) |
| { |
| if (*s == '\\') |
| *d++ = *++s; |
| else |
| *d++ = *s; |
| s++; |
| } |
| *d = '\0'; |
| } |
| |
| /* Get flags. */ |
| |
| flag[1] = flag[2] = flag[3] = flag[4] = false; |
| |
| for (;;) |
| { |
| c = strchr (c, ' '); |
| if (c == NULL) |
| break; |
| |
| c++; |
| i = atoi (c); |
| |
| if (1 <= i && i <= 4) |
| flag[i] = true; |
| } |
| |
| /* Interpret flags. */ |
| |
| if (flag[1]) /* Starting new file. */ |
| { |
| f = get_file (filename, LC_RENAME); |
| f->up = current_file; |
| current_file = f; |
| } |
| |
| if (flag[2]) /* Ending current file. */ |
| { |
| if (!current_file->up |
| || strcmp (current_file->up->filename, filename) != 0) |
| { |
| gfc_warning_now ("%s:%d: file %s left but not entered", |
| current_file->filename, current_file->line, |
| filename); |
| if (unescape) |
| gfc_free (filename); |
| return; |
| } |
| current_file = current_file->up; |
| } |
| |
| /* The name of the file can be a temporary file produced by |
| cpp. Replace the name if it is different. */ |
| |
| if (strcmp (current_file->filename, filename) != 0) |
| { |
| gfc_free (current_file->filename); |
| current_file->filename = gfc_getmem (strlen (filename) + 1); |
| strcpy (current_file->filename, filename); |
| } |
| |
| /* Set new line number. */ |
| current_file->line = line; |
| if (unescape) |
| gfc_free (filename); |
| return; |
| |
| bad_cpp_line: |
| gfc_warning_now ("%s:%d: Illegal preprocessor directive", |
| current_file->filename, current_file->line); |
| current_file->line++; |
| } |
| |
| |
| static try load_file (const char *, bool); |
| |
| /* include_line()-- Checks a line buffer to see if it is an include |
| line. If so, we call load_file() recursively to load the included |
| file. We never return a syntax error because a statement like |
| "include = 5" is perfectly legal. We return false if no include was |
| processed or true if we matched an include. */ |
| |
| static bool |
| include_line (char *line) |
| { |
| char quote, *c, *begin, *stop; |
| |
| c = line; |
| |
| if (gfc_option.flag_openmp) |
| { |
| if (gfc_current_form == FORM_FREE) |
| { |
| while (*c == ' ' || *c == '\t') |
| c++; |
| if (*c == '!' && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) |
| c += 3; |
| } |
| else |
| { |
| if ((*c == '!' || *c == 'c' || *c == 'C' || *c == '*') |
| && c[1] == '$' && (c[2] == ' ' || c[2] == '\t')) |
| c += 3; |
| } |
| } |
| |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| if (strncasecmp (c, "include", 7)) |
| return false; |
| |
| c += 7; |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| /* Find filename between quotes. */ |
| |
| quote = *c++; |
| if (quote != '"' && quote != '\'') |
| return false; |
| |
| begin = c; |
| |
| while (*c != quote && *c != '\0') |
| c++; |
| |
| if (*c == '\0') |
| return false; |
| |
| stop = c++; |
| |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| if (*c != '\0' && *c != '!') |
| return false; |
| |
| /* We have an include line at this point. */ |
| |
| *stop = '\0'; /* It's ok to trash the buffer, as this line won't be |
| read by anything else. */ |
| |
| load_file (begin, false); |
| return true; |
| } |
| |
| /* Load a file into memory by calling load_line until the file ends. */ |
| |
| static try |
| load_file (const char *filename, bool initial) |
| { |
| char *line; |
| gfc_linebuf *b; |
| gfc_file *f; |
| FILE *input; |
| int len, line_len; |
| |
| for (f = current_file; f; f = f->up) |
| if (strcmp (filename, f->filename) == 0) |
| { |
| gfc_error_now ("File '%s' is being included recursively", filename); |
| return FAILURE; |
| } |
| |
| if (initial) |
| { |
| if (gfc_src_file) |
| { |
| input = gfc_src_file; |
| gfc_src_file = NULL; |
| } |
| else |
| input = gfc_open_file (filename); |
| if (input == NULL) |
| { |
| gfc_error_now ("Can't open file '%s'", filename); |
| return FAILURE; |
| } |
| } |
| else |
| { |
| input = gfc_open_included_file (filename, false); |
| if (input == NULL) |
| { |
| gfc_error_now ("Can't open included file '%s'", filename); |
| return FAILURE; |
| } |
| } |
| |
| /* Load the file. */ |
| |
| f = get_file (filename, initial ? LC_RENAME : LC_ENTER); |
| f->up = current_file; |
| current_file = f; |
| current_file->line = 1; |
| line = NULL; |
| line_len = 0; |
| |
| if (initial && gfc_src_preprocessor_lines[0]) |
| { |
| preprocessor_line (gfc_src_preprocessor_lines[0]); |
| gfc_free (gfc_src_preprocessor_lines[0]); |
| gfc_src_preprocessor_lines[0] = NULL; |
| if (gfc_src_preprocessor_lines[1]) |
| { |
| preprocessor_line (gfc_src_preprocessor_lines[1]); |
| gfc_free (gfc_src_preprocessor_lines[1]); |
| gfc_src_preprocessor_lines[1] = NULL; |
| } |
| } |
| |
| for (;;) |
| { |
| int trunc = load_line (input, &line, &line_len); |
| |
| len = strlen (line); |
| if (feof (input) && len == 0) |
| break; |
| |
| /* There are three things this line can be: a line of Fortran |
| source, an include line or a C preprocessor directive. */ |
| |
| if (line[0] == '#') |
| { |
| preprocessor_line (line); |
| continue; |
| } |
| |
| if (include_line (line)) |
| { |
| current_file->line++; |
| continue; |
| } |
| |
| /* Add line. */ |
| |
| b = gfc_getmem (gfc_linebuf_header_size + len + 1); |
| |
| #ifdef USE_MAPPED_LOCATION |
| b->location |
| = linemap_line_start (&line_table, current_file->line++, 120); |
| #else |
| b->linenum = current_file->line++; |
| #endif |
| b->file = current_file; |
| b->truncated = trunc; |
| strcpy (b->line, line); |
| |
| if (line_head == NULL) |
| line_head = b; |
| else |
| line_tail->next = b; |
| |
| line_tail = b; |
| } |
| |
| /* Release the line buffer allocated in load_line. */ |
| gfc_free (line); |
| |
| fclose (input); |
| |
| current_file = current_file->up; |
| #ifdef USE_MAPPED_LOCATION |
| linemap_add (&line_table, LC_LEAVE, 0, NULL, 0); |
| #endif |
| return SUCCESS; |
| } |
| |
| |
| /* Open a new file and start scanning from that file. Returns SUCCESS |
| if everything went OK, FAILURE otherwise. If form == FORM_UKNOWN |
| it tries to determine the source form from the filename, defaulting |
| to free form. */ |
| |
| try |
| gfc_new_file (void) |
| { |
| try result; |
| |
| result = load_file (gfc_source_file, true); |
| |
| gfc_current_locus.lb = line_head; |
| gfc_current_locus.nextc = (line_head == NULL) ? NULL : line_head->line; |
| |
| #if 0 /* Debugging aid. */ |
| for (; line_head; line_head = line_head->next) |
| gfc_status ("%s:%3d %s\n", line_head->file->filename, |
| #ifdef USE_MAPPED_LOCATION |
| LOCATION_LINE (line_head->location), |
| #else |
| line_head->linenum, |
| #endif |
| line_head->line); |
| |
| exit (0); |
| #endif |
| |
| return result; |
| } |
| |
| static char * |
| unescape_filename (const char *ptr) |
| { |
| const char *p = ptr, *s; |
| char *d, *ret; |
| int escaped, unescape = 0; |
| |
| /* Make filename end at quote. */ |
| escaped = false; |
| while (*p && ! (! escaped && *p == '"')) |
| { |
| if (escaped) |
| escaped = false; |
| else if (*p == '\\') |
| { |
| escaped = true; |
| unescape++; |
| } |
| ++p; |
| } |
| |
| if (! *p || p[1]) |
| return NULL; |
| |
| /* Undo effects of cpp_quote_string. */ |
| s = ptr; |
| d = gfc_getmem (p + 1 - ptr - unescape); |
| ret = d; |
| |
| while (s != p) |
| { |
| if (*s == '\\') |
| *d++ = *++s; |
| else |
| *d++ = *s; |
| s++; |
| } |
| *d = '\0'; |
| return ret; |
| } |
| |
| /* For preprocessed files, if the first tokens are of the form # NUM. |
| handle the directives so we know the original file name. */ |
| |
| const char * |
| gfc_read_orig_filename (const char *filename, const char **canon_source_file) |
| { |
| int c, len; |
| char *dirname; |
| |
| gfc_src_file = gfc_open_file (filename); |
| if (gfc_src_file == NULL) |
| return NULL; |
| |
| c = fgetc (gfc_src_file); |
| ungetc (c, gfc_src_file); |
| |
| if (c != '#') |
| return NULL; |
| |
| len = 0; |
| load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len); |
| |
| if (strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) |
| return NULL; |
| |
| filename = unescape_filename (gfc_src_preprocessor_lines[0] + 5); |
| if (filename == NULL) |
| return NULL; |
| |
| c = fgetc (gfc_src_file); |
| ungetc (c, gfc_src_file); |
| |
| if (c != '#') |
| return filename; |
| |
| len = 0; |
| load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len); |
| |
| if (strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) |
| return filename; |
| |
| dirname = unescape_filename (gfc_src_preprocessor_lines[1] + 5); |
| if (dirname == NULL) |
| return filename; |
| |
| len = strlen (dirname); |
| if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') |
| { |
| gfc_free (dirname); |
| return filename; |
| } |
| dirname[len - 2] = '\0'; |
| set_src_pwd (dirname); |
| |
| if (! IS_ABSOLUTE_PATH (filename)) |
| { |
| char *p = gfc_getmem (len + strlen (filename)); |
| |
| memcpy (p, dirname, len - 2); |
| p[len - 2] = '/'; |
| strcpy (p + len - 1, filename); |
| *canon_source_file = p; |
| } |
| |
| gfc_free (dirname); |
| return filename; |
| } |