| /* Character scanner. |
| Copyright (C) 2000-2018 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/>. */ |
| |
| /* 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 "coretypes.h" |
| #include "gfortran.h" |
| #include "toplev.h" /* For set_src_pwd. */ |
| #include "debug.h" |
| #include "options.h" |
| #include "cpp.h" |
| #include "scanner.h" |
| |
| /* List of include file search directories. */ |
| gfc_directorylist *include_dirs, *intrinsic_modules_dirs; |
| |
| static gfc_file *file_head, *current_file; |
| |
| static int continue_flag, end_flag, gcc_attribute_flag; |
| /* If !$omp/!$acc occurred in current comment line. */ |
| static int openmp_flag, openacc_flag; |
| static int continue_count, continue_line; |
| static locus openmp_locus; |
| static locus openacc_locus; |
| static locus gcc_attribute_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 gfc_char_t *gfc_src_preprocessor_lines[2]; |
| |
| static struct gfc_file_change |
| { |
| const char *filename; |
| gfc_linebuf *lb; |
| int line; |
| } *file_changes; |
| size_t file_changes_cur, file_changes_count; |
| size_t file_changes_allocated; |
| |
| static gfc_char_t *last_error_char; |
| |
| /* Functions dealing with our wide characters (gfc_char_t) and |
| sequences of such characters. */ |
| |
| int |
| gfc_wide_fits_in_byte (gfc_char_t c) |
| { |
| return (c <= UCHAR_MAX); |
| } |
| |
| static inline int |
| wide_is_ascii (gfc_char_t c) |
| { |
| return (gfc_wide_fits_in_byte (c) && ((unsigned char) c & ~0x7f) == 0); |
| } |
| |
| int |
| gfc_wide_is_printable (gfc_char_t c) |
| { |
| return (gfc_wide_fits_in_byte (c) && ISPRINT ((unsigned char) c)); |
| } |
| |
| gfc_char_t |
| gfc_wide_tolower (gfc_char_t c) |
| { |
| return (wide_is_ascii (c) ? (gfc_char_t) TOLOWER((unsigned char) c) : c); |
| } |
| |
| gfc_char_t |
| gfc_wide_toupper (gfc_char_t c) |
| { |
| return (wide_is_ascii (c) ? (gfc_char_t) TOUPPER((unsigned char) c) : c); |
| } |
| |
| int |
| gfc_wide_is_digit (gfc_char_t c) |
| { |
| return (c >= '0' && c <= '9'); |
| } |
| |
| static inline int |
| wide_atoi (gfc_char_t *c) |
| { |
| #define MAX_DIGITS 20 |
| char buf[MAX_DIGITS+1]; |
| int i = 0; |
| |
| while (gfc_wide_is_digit(*c) && i < MAX_DIGITS) |
| buf[i++] = *c++; |
| buf[i] = '\0'; |
| return atoi (buf); |
| } |
| |
| size_t |
| gfc_wide_strlen (const gfc_char_t *str) |
| { |
| size_t i; |
| |
| for (i = 0; str[i]; i++) |
| ; |
| |
| return i; |
| } |
| |
| gfc_char_t * |
| gfc_wide_memset (gfc_char_t *b, gfc_char_t c, size_t len) |
| { |
| size_t i; |
| |
| for (i = 0; i < len; i++) |
| b[i] = c; |
| |
| return b; |
| } |
| |
| static gfc_char_t * |
| wide_strcpy (gfc_char_t *dest, const gfc_char_t *src) |
| { |
| gfc_char_t *d; |
| |
| for (d = dest; (*d = *src) != '\0'; ++src, ++d) |
| ; |
| |
| return dest; |
| } |
| |
| static gfc_char_t * |
| wide_strchr (const gfc_char_t *s, gfc_char_t c) |
| { |
| do { |
| if (*s == c) |
| { |
| return CONST_CAST(gfc_char_t *, s); |
| } |
| } while (*s++); |
| return 0; |
| } |
| |
| char * |
| gfc_widechar_to_char (const gfc_char_t *s, int length) |
| { |
| size_t len, i; |
| char *res; |
| |
| if (s == NULL) |
| return NULL; |
| |
| /* Passing a negative length is used to indicate that length should be |
| calculated using gfc_wide_strlen(). */ |
| len = (length >= 0 ? (size_t) length : gfc_wide_strlen (s)); |
| res = XNEWVEC (char, len + 1); |
| |
| for (i = 0; i < len; i++) |
| { |
| gcc_assert (gfc_wide_fits_in_byte (s[i])); |
| res[i] = (unsigned char) s[i]; |
| } |
| |
| res[len] = '\0'; |
| return res; |
| } |
| |
| gfc_char_t * |
| gfc_char_to_widechar (const char *s) |
| { |
| size_t len, i; |
| gfc_char_t *res; |
| |
| if (s == NULL) |
| return NULL; |
| |
| len = strlen (s); |
| res = gfc_get_wide_string (len + 1); |
| |
| for (i = 0; i < len; i++) |
| res[i] = (unsigned char) s[i]; |
| |
| res[len] = '\0'; |
| return res; |
| } |
| |
| static int |
| wide_strncmp (const gfc_char_t *s1, const char *s2, size_t n) |
| { |
| gfc_char_t c1, c2; |
| |
| while (n-- > 0) |
| { |
| c1 = *s1++; |
| c2 = *s2++; |
| if (c1 != c2) |
| return (c1 > c2 ? 1 : -1); |
| if (c1 == '\0') |
| return 0; |
| } |
| return 0; |
| } |
| |
| int |
| gfc_wide_strncasecmp (const gfc_char_t *s1, const char *s2, size_t n) |
| { |
| gfc_char_t c1, c2; |
| |
| while (n-- > 0) |
| { |
| c1 = gfc_wide_tolower (*s1++); |
| c2 = TOLOWER (*s2++); |
| if (c1 != c2) |
| return (c1 > c2 ? 1 : -1); |
| if (c1 == '\0') |
| return 0; |
| } |
| return 0; |
| } |
| |
| |
| /* 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; |
| last_error_char = NULL; |
| } |
| |
| |
| /* Main scanner destructor. */ |
| |
| void |
| gfc_scanner_done_1 (void) |
| { |
| gfc_linebuf *lb; |
| gfc_file *f; |
| |
| while(line_head != NULL) |
| { |
| lb = line_head->next; |
| free (line_head); |
| line_head = lb; |
| } |
| |
| while(file_head != NULL) |
| { |
| f = file_head->next; |
| free (file_head->filename); |
| free (file_head); |
| file_head = f; |
| } |
| } |
| |
| |
| /* Adds path to the list pointed to by list. */ |
| |
| static void |
| add_path_to_list (gfc_directorylist **list, const char *path, |
| bool use_for_modules, bool head, bool warn) |
| { |
| gfc_directorylist *dir; |
| const char *p; |
| char *q; |
| struct stat st; |
| size_t len; |
| int i; |
| |
| p = path; |
| while (*p == ' ' || *p == '\t') /* someone might do "-I include" */ |
| if (*p++ == '\0') |
| return; |
| |
| /* Strip trailing directory separators from the path, as this |
| will confuse Windows systems. */ |
| len = strlen (p); |
| q = (char *) alloca (len + 1); |
| memcpy (q, p, len + 1); |
| i = len - 1; |
| while (i >=0 && IS_DIR_SEPARATOR (q[i])) |
| q[i--] = '\0'; |
| |
| if (stat (q, &st)) |
| { |
| if (errno != ENOENT) |
| gfc_warning_now (0, "Include directory %qs: %s", path, |
| xstrerror(errno)); |
| else if (warn) |
| gfc_warning_now (OPT_Wmissing_include_dirs, |
| "Nonexistent include directory %qs", path); |
| return; |
| } |
| else if (!S_ISDIR (st.st_mode)) |
| { |
| gfc_fatal_error ("%qs is not a directory", path); |
| return; |
| } |
| |
| if (head || *list == NULL) |
| { |
| dir = XCNEW (gfc_directorylist); |
| if (!head) |
| *list = dir; |
| } |
| else |
| { |
| dir = *list; |
| while (dir->next) |
| dir = dir->next; |
| |
| dir->next = XCNEW (gfc_directorylist); |
| dir = dir->next; |
| } |
| |
| dir->next = head ? *list : NULL; |
| if (head) |
| *list = dir; |
| dir->use_for_modules = use_for_modules; |
| dir->path = XCNEWVEC (char, strlen (p) + 2); |
| strcpy (dir->path, p); |
| strcat (dir->path, "/"); /* make '/' last character */ |
| } |
| |
| |
| void |
| gfc_add_include_path (const char *path, bool use_for_modules, bool file_dir, |
| bool warn) |
| { |
| add_path_to_list (&include_dirs, path, use_for_modules, file_dir, warn); |
| |
| /* For '#include "..."' these directories are automatically searched. */ |
| if (!file_dir) |
| gfc_cpp_add_include_path (xstrdup(path), true); |
| } |
| |
| |
| void |
| gfc_add_intrinsic_modules_path (const char *path) |
| { |
| add_path_to_list (&intrinsic_modules_dirs, path, true, false, false); |
| } |
| |
| |
| /* Release resources allocated for options. */ |
| |
| void |
| gfc_release_include_path (void) |
| { |
| gfc_directorylist *p; |
| |
| while (include_dirs != NULL) |
| { |
| p = include_dirs; |
| include_dirs = include_dirs->next; |
| free (p->path); |
| free (p); |
| } |
| |
| while (intrinsic_modules_dirs != NULL) |
| { |
| p = intrinsic_modules_dirs; |
| intrinsic_modules_dirs = intrinsic_modules_dirs->next; |
| free (p->path); |
| free (p); |
| } |
| |
| free (gfc_option.module_dir); |
| } |
| |
| |
| static FILE * |
| open_included_file (const char *name, gfc_directorylist *list, |
| bool module, bool system) |
| { |
| char *fullname; |
| gfc_directorylist *p; |
| FILE *f; |
| |
| for (p = list; p; p = p->next) |
| { |
| if (module && !p->use_for_modules) |
| continue; |
| |
| fullname = (char *) alloca(strlen (p->path) + strlen (name) + 1); |
| strcpy (fullname, p->path); |
| strcat (fullname, name); |
| |
| f = gfc_open_file (fullname); |
| if (f != NULL) |
| { |
| if (gfc_cpp_makedep ()) |
| gfc_cpp_add_dep (fullname, system); |
| |
| return f; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| |
| /* 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, bool include_cwd, bool module) |
| { |
| FILE *f = NULL; |
| |
| if (IS_ABSOLUTE_PATH (name) || include_cwd) |
| { |
| f = gfc_open_file (name); |
| if (f && gfc_cpp_makedep ()) |
| gfc_cpp_add_dep (name, false); |
| } |
| |
| if (!f) |
| f = open_included_file (name, include_dirs, module, false); |
| |
| return f; |
| } |
| |
| |
| /* 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'); |
| } |
| |
| static void |
| add_file_change (const char *filename, int line) |
| { |
| if (file_changes_count == file_changes_allocated) |
| { |
| if (file_changes_allocated) |
| file_changes_allocated *= 2; |
| else |
| file_changes_allocated = 16; |
| file_changes = XRESIZEVEC (struct gfc_file_change, file_changes, |
| file_changes_allocated); |
| } |
| file_changes[file_changes_count].filename = filename; |
| file_changes[file_changes_count].lb = NULL; |
| file_changes[file_changes_count++].line = line; |
| } |
| |
| static void |
| report_file_change (gfc_linebuf *lb) |
| { |
| size_t c = file_changes_cur; |
| while (c < file_changes_count |
| && file_changes[c].lb == lb) |
| { |
| if (file_changes[c].filename) |
| (*debug_hooks->start_source_file) (file_changes[c].line, |
| file_changes[c].filename); |
| else |
| (*debug_hooks->end_source_file) (file_changes[c].line); |
| ++c; |
| } |
| file_changes_cur = c; |
| } |
| |
| void |
| gfc_start_source_files (void) |
| { |
| /* If the debugger wants the name of the main source file, |
| we give it. */ |
| if (debug_hooks->start_end_main_source_file) |
| (*debug_hooks->start_source_file) (0, gfc_source_file); |
| |
| file_changes_cur = 0; |
| report_file_change (gfc_current_locus.lb); |
| } |
| |
| void |
| gfc_end_source_files (void) |
| { |
| report_file_change (NULL); |
| |
| if (debug_hooks->start_end_main_source_file) |
| (*debug_hooks->end_source_file) (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; |
| } |
| |
| if (gfc_current_locus.lb->next |
| && !gfc_current_locus.lb->next->dbg_emitted) |
| { |
| report_file_change (gfc_current_locus.lb->next); |
| gfc_current_locus.lb->next->dbg_emitted = true; |
| } |
| |
| 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 gfc_char_t |
| next_char (void) |
| { |
| gfc_char_t c; |
| |
| if (gfc_current_locus.nextc == NULL) |
| return '\n'; |
| |
| c = *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 within comments, here is where we parse the |
| directive. */ |
| |
| static void |
| skip_comment_line (void) |
| { |
| gfc_char_t c; |
| |
| do |
| { |
| c = next_char (); |
| } |
| while (c != '\n'); |
| |
| gfc_advance_line (); |
| } |
| |
| |
| int |
| gfc_define_undef_line (void) |
| { |
| char *tmp; |
| |
| /* All lines beginning with '#' are either #define or #undef. */ |
| if (debug_info_level != DINFO_LEVEL_VERBOSE || gfc_peek_ascii_char () != '#') |
| return 0; |
| |
| if (wide_strncmp (gfc_current_locus.nextc, "#define ", 8) == 0) |
| { |
| tmp = gfc_widechar_to_char (&gfc_current_locus.nextc[8], -1); |
| (*debug_hooks->define) (gfc_linebuf_linenum (gfc_current_locus.lb), |
| tmp); |
| free (tmp); |
| } |
| |
| if (wide_strncmp (gfc_current_locus.nextc, "#undef ", 7) == 0) |
| { |
| tmp = gfc_widechar_to_char (&gfc_current_locus.nextc[7], -1); |
| (*debug_hooks->undef) (gfc_linebuf_linenum (gfc_current_locus.lb), |
| tmp); |
| free (tmp); |
| } |
| |
| /* Skip the rest of the line. */ |
| skip_comment_line (); |
| |
| return 1; |
| } |
| |
| |
| /* Return true if GCC$ was matched. */ |
| static bool |
| skip_gcc_attribute (locus start) |
| { |
| bool r = false; |
| char c; |
| locus old_loc = gfc_current_locus; |
| |
| if ((c = next_char ()) == 'g' || c == 'G') |
| if ((c = next_char ()) == 'c' || c == 'C') |
| if ((c = next_char ()) == 'c' || c == 'C') |
| if ((c = next_char ()) == '$') |
| r = true; |
| |
| if (r == false) |
| gfc_current_locus = old_loc; |
| else |
| { |
| gcc_attribute_flag = 1; |
| gcc_attribute_locus = old_loc; |
| gfc_current_locus = start; |
| } |
| |
| return r; |
| } |
| |
| /* Return true if CC was matched. */ |
| static bool |
| skip_free_oacc_sentinel (locus start, locus old_loc) |
| { |
| bool r = false; |
| char c; |
| |
| if ((c = next_char ()) == 'c' || c == 'C') |
| if ((c = next_char ()) == 'c' || c == 'C') |
| r = true; |
| |
| if (r) |
| { |
| if ((c = next_char ()) == ' ' || c == '\t' |
| || continue_flag) |
| { |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| if (c != '\n' && c != '!') |
| { |
| openacc_flag = 1; |
| openacc_locus = old_loc; |
| gfc_current_locus = start; |
| } |
| else |
| r = false; |
| } |
| else |
| { |
| gfc_warning_now (0, "!$ACC at %C starts a commented " |
| "line as it neither is followed " |
| "by a space nor is a " |
| "continuation line"); |
| r = false; |
| } |
| } |
| |
| return r; |
| } |
| |
| /* Return true if MP was matched. */ |
| static bool |
| skip_free_omp_sentinel (locus start, locus old_loc) |
| { |
| bool r = false; |
| char c; |
| |
| if ((c = next_char ()) == 'm' || c == 'M') |
| if ((c = next_char ()) == 'p' || c == 'P') |
| r = true; |
| |
| if (r) |
| { |
| if ((c = next_char ()) == ' ' || c == '\t' |
| || 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; |
| } |
| else |
| r = false; |
| } |
| else |
| { |
| gfc_warning_now (0, "!$OMP at %C starts a commented " |
| "line as it neither is followed " |
| "by a space nor is a " |
| "continuation line"); |
| r = false; |
| } |
| } |
| |
| return r; |
| } |
| |
| /* Comment lines are null lines, lines containing only blanks or lines |
| on which the first nonblank line is a '!'. |
| Return true if !$ openmp or openacc conditional compilation sentinel was |
| seen. */ |
| |
| static bool |
| skip_free_comments (void) |
| { |
| locus start; |
| gfc_char_t 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 == '!') |
| { |
| /* Keep the !GCC$ line. */ |
| if (at_bol && skip_gcc_attribute (start)) |
| return false; |
| |
| /* If -fopenmp/-fopenacc, we need to handle here 2 things: |
| 1) don't treat !$omp/!$acc as comments, but directives |
| 2) handle OpenMP/OpenACC conditional compilation, where |
| !$ should be treated as 2 spaces (for initial lines |
| only if followed by space). */ |
| if (at_bol) |
| { |
| if ((flag_openmp || flag_openmp_simd) |
| && flag_openacc) |
| { |
| locus old_loc = gfc_current_locus; |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'o' || c == 'O') |
| { |
| if (skip_free_omp_sentinel (start, old_loc)) |
| return false; |
| gfc_current_locus = old_loc; |
| next_char (); |
| c = next_char (); |
| } |
| else if (c == 'a' || c == 'A') |
| { |
| if (skip_free_oacc_sentinel (start, old_loc)) |
| return false; |
| gfc_current_locus = old_loc; |
| next_char (); |
| c = next_char (); |
| } |
| if (continue_flag || c == ' ' || c == '\t') |
| { |
| gfc_current_locus = old_loc; |
| next_char (); |
| openmp_flag = openacc_flag = 0; |
| return true; |
| } |
| } |
| gfc_current_locus = old_loc; |
| } |
| else if ((flag_openmp || flag_openmp_simd) |
| && !flag_openacc) |
| { |
| locus old_loc = gfc_current_locus; |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'o' || c == 'O') |
| { |
| if (skip_free_omp_sentinel (start, old_loc)) |
| return false; |
| gfc_current_locus = old_loc; |
| next_char (); |
| c = next_char (); |
| } |
| if (continue_flag || c == ' ' || c == '\t') |
| { |
| gfc_current_locus = old_loc; |
| next_char (); |
| openmp_flag = 0; |
| return true; |
| } |
| } |
| gfc_current_locus = old_loc; |
| } |
| else if (flag_openacc |
| && !(flag_openmp || flag_openmp_simd)) |
| { |
| locus old_loc = gfc_current_locus; |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'a' || c == 'A') |
| { |
| if (skip_free_oacc_sentinel (start, old_loc)) |
| return false; |
| gfc_current_locus = old_loc; |
| next_char(); |
| c = next_char(); |
| } |
| if (continue_flag || c == ' ' || c == '\t') |
| { |
| gfc_current_locus = old_loc; |
| next_char(); |
| openacc_flag = 0; |
| return true; |
| } |
| } |
| gfc_current_locus = old_loc; |
| } |
| } |
| skip_comment_line (); |
| continue; |
| } |
| |
| break; |
| } |
| |
| if (openmp_flag && at_bol) |
| openmp_flag = 0; |
| |
| if (openacc_flag && at_bol) |
| openacc_flag = 0; |
| |
| gcc_attribute_flag = 0; |
| gfc_current_locus = start; |
| return false; |
| } |
| |
| /* Return true if MP was matched in fixed form. */ |
| static bool |
| skip_fixed_omp_sentinel (locus *start) |
| { |
| gfc_char_t c; |
| if (((c = next_char ()) == 'm' || c == 'M') |
| && ((c = next_char ()) == 'p' || c == 'P')) |
| { |
| c = next_char (); |
| if (c != '\n' |
| && (continue_flag |
| || c == ' ' || c == '\t' || c == '0')) |
| { |
| do |
| c = next_char (); |
| while (gfc_is_whitespace (c)); |
| if (c != '\n' && c != '!') |
| { |
| /* Canonicalize to *$omp. */ |
| *start->nextc = '*'; |
| openmp_flag = 1; |
| gfc_current_locus = *start; |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /* Return true if CC was matched in fixed form. */ |
| static bool |
| skip_fixed_oacc_sentinel (locus *start) |
| { |
| gfc_char_t c; |
| if (((c = next_char ()) == 'c' || c == 'C') |
| && ((c = next_char ()) == 'c' || c == 'C')) |
| { |
| c = next_char (); |
| if (c != '\n' |
| && (continue_flag |
| || c == ' ' || c == '\t' || c == '0')) |
| { |
| do |
| c = next_char (); |
| while (gfc_is_whitespace (c)); |
| if (c != '\n' && c != '!') |
| { |
| /* Canonicalize to *$acc. */ |
| *start->nextc = '*'; |
| openacc_flag = 1; |
| gfc_current_locus = *start; |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /* Skip comment lines in fixed source mode. We have the same rules as |
| in skip_free_comment(), except that we can have a 'c', 'C' or '*' |
| in column 1, and a '!' cannot be in column 6. Also, we deal with |
| lines with 'd' or 'D' in column 1, if the user requested this. */ |
| |
| static void |
| skip_fixed_comments (void) |
| { |
| locus start; |
| int col; |
| gfc_char_t c; |
| |
| if (! gfc_at_bol ()) |
| { |
| start = gfc_current_locus; |
| if (! gfc_at_eof ()) |
| { |
| do |
| c = next_char (); |
| while (gfc_is_whitespace (c)); |
| |
| if (c == '\n') |
| gfc_advance_line (); |
| else if (c == '!') |
| skip_comment_line (); |
| } |
| |
| if (! gfc_at_bol ()) |
| { |
| gfc_current_locus = start; |
| return; |
| } |
| } |
| |
| for (;;) |
| { |
| start = gfc_current_locus; |
| if (gfc_at_eof ()) |
| break; |
| |
| c = next_char (); |
| if (c == '\n') |
| { |
| gfc_advance_line (); |
| continue; |
| } |
| |
| if (c == '!' || c == 'c' || c == 'C' || c == '*') |
| { |
| if (skip_gcc_attribute (start)) |
| { |
| /* Canonicalize to *$omp. */ |
| *start.nextc = '*'; |
| return; |
| } |
| |
| /* If -fopenmp/-fopenacc, we need to handle here 2 things: |
| 1) don't treat !$omp/!$acc|c$omp/c$acc|*$omp / *$acc as comments, |
| but directives |
| 2) handle OpenMP/OpenACC 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_current_locus.lb != NULL |
| && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) |
| continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
| |
| if ((flag_openmp || flag_openmp_simd) && !flag_openacc) |
| { |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'o' || c == 'O') |
| { |
| if (skip_fixed_omp_sentinel (&start)) |
| return; |
| } |
| else |
| goto check_for_digits; |
| } |
| gfc_current_locus = start; |
| } |
| |
| if (flag_openacc && !(flag_openmp || flag_openmp_simd)) |
| { |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'a' || c == 'A') |
| { |
| if (skip_fixed_oacc_sentinel (&start)) |
| return; |
| } |
| else |
| goto check_for_digits; |
| } |
| gfc_current_locus = start; |
| } |
| |
| if (flag_openacc || flag_openmp || flag_openmp_simd) |
| { |
| if (next_char () == '$') |
| { |
| c = next_char (); |
| if (c == 'a' || c == 'A') |
| { |
| if (skip_fixed_oacc_sentinel (&start)) |
| return; |
| } |
| else if (c == 'o' || c == 'O') |
| { |
| if (skip_fixed_omp_sentinel (&start)) |
| return; |
| } |
| else |
| goto check_for_digits; |
| } |
| gfc_current_locus = start; |
| } |
| |
| skip_comment_line (); |
| continue; |
| |
| gcc_unreachable (); |
| check_for_digits: |
| { |
| int digit_seen = 0; |
| |
| for (col = 3; col < 6; col++, c = next_char ()) |
| if (c == ' ') |
| continue; |
| else if (c == '\t') |
| { |
| col = 6; |
| break; |
| } |
| else if (c < '0' || c > '9') |
| break; |
| else |
| digit_seen = 1; |
| |
| if (col == 6 && c != '\n' |
| && ((continue_flag && !digit_seen) |
| || c == ' ' || c == '\t' || c == '0')) |
| { |
| gfc_current_locus = start; |
| start.nextc[0] = ' '; |
| start.nextc[1] = ' '; |
| continue; |
| } |
| } |
| 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 == '!') |
| { |
| if (gfc_current_locus.lb != NULL |
| && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) |
| continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
| skip_comment_line (); |
| continue; |
| } |
| |
| break; |
| } |
| |
| openmp_flag = 0; |
| openacc_flag = 0; |
| gcc_attribute_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. */ |
| |
| gfc_char_t |
| gfc_next_char_literal (gfc_instring in_string) |
| { |
| locus old_loc; |
| int i, prev_openmp_flag, prev_openacc_flag; |
| gfc_char_t c; |
| |
| continue_flag = 0; |
| prev_openacc_flag = prev_openmp_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 (gcc_attribute_flag |
| && memcmp (&gfc_current_locus, &gcc_attribute_locus, |
| sizeof (gfc_current_locus)) == 0) |
| goto done; |
| |
| if (openmp_flag |
| && memcmp (&gfc_current_locus, &openmp_locus, |
| sizeof (gfc_current_locus)) == 0) |
| goto done; |
| |
| if (openacc_flag |
| && memcmp (&gfc_current_locus, &openacc_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; |
| } |
| |
| /* Check to see if the continuation line was truncated. */ |
| if (warn_line_truncation && gfc_current_locus.lb != NULL |
| && gfc_current_locus.lb->truncated) |
| { |
| int maxlen = flag_free_line_length; |
| gfc_char_t *current_nextc = gfc_current_locus.nextc; |
| |
| gfc_current_locus.lb->truncated = 0; |
| gfc_current_locus.nextc = gfc_current_locus.lb->line + maxlen; |
| gfc_warning_now (OPT_Wline_truncation, |
| "Line truncated at %L", &gfc_current_locus); |
| gfc_current_locus.nextc = current_nextc; |
| } |
| |
| 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 '&'. However, there are cases where we may think we |
| are still in a string and we are looking for a possible |
| doubled quote and we end up here. See PR64506. */ |
| |
| 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; |
| } |
| |
| if (flag_openmp) |
| prev_openmp_flag = openmp_flag; |
| if (flag_openacc) |
| prev_openacc_flag = openacc_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_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
| { |
| if (++continue_count == gfc_option.max_continue_free) |
| { |
| if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
| gfc_warning (0, "Limit of %d continuations exceeded in " |
| "statement at %C", gfc_option.max_continue_free); |
| } |
| } |
| |
| /* Now find where it continues. First eat any comment lines. */ |
| openmp_cond_flag = skip_free_comments (); |
| |
| if (gfc_current_locus.lb != NULL |
| && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) |
| continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
| |
| if (flag_openmp) |
| if (prev_openmp_flag != openmp_flag && !openacc_flag) |
| { |
| gfc_current_locus = old_loc; |
| openmp_flag = prev_openmp_flag; |
| c = '&'; |
| goto done; |
| } |
| |
| if (flag_openacc) |
| if (prev_openacc_flag != openacc_flag && !openmp_flag) |
| { |
| gfc_current_locus = old_loc; |
| openacc_flag = prev_openacc_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 && !openacc_flag) |
| { |
| for (i = 0; i < 5; i++, c = next_char ()) |
| { |
| gcc_assert (gfc_wide_tolower (c) == (unsigned char) "!$omp"[i]); |
| if (i == 4) |
| old_loc = gfc_current_locus; |
| } |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| } |
| if (openacc_flag && !openmp_flag) |
| { |
| for (i = 0; i < 5; i++, c = next_char ()) |
| { |
| gcc_assert (gfc_wide_tolower (c) == (unsigned char) "!$acc"[i]); |
| if (i == 4) |
| old_loc = gfc_current_locus; |
| } |
| while (gfc_is_whitespace (c)) |
| c = next_char (); |
| } |
| |
| /* In case we have an OpenMP directive continued by OpenACC |
| sentinel, or vice versa, we get both openmp_flag and |
| openacc_flag on. */ |
| |
| if (openacc_flag && openmp_flag) |
| { |
| int is_openmp = 0; |
| for (i = 0; i < 5; i++, c = next_char ()) |
| { |
| if (gfc_wide_tolower (c) != (unsigned char) "!$acc"[i]) |
| is_openmp = 1; |
| if (i == 4) |
| old_loc = gfc_current_locus; |
| } |
| gfc_error (is_openmp |
| ? G_("Wrong OpenACC continuation at %C: " |
| "expected !$ACC, got !$OMP") |
| : G_("Wrong OpenMP continuation at %C: " |
| "expected !$OMP, got !$ACC")); |
| } |
| |
| if (c != '&') |
| { |
| if (in_string && gfc_current_locus.nextc) |
| { |
| gfc_current_locus.nextc--; |
| if (warn_ampersand && in_string == INSTRING_WARN) |
| gfc_warning (OPT_Wampersand, |
| "Missing %<&%> in continued character " |
| "constant at %C"); |
| } |
| else if (!in_string && (c == '\'' || c == '"')) |
| goto done; |
| /* Both !$omp and !$ -fopenmp continuation lines have & on the |
| continuation line only optionally. */ |
| else if (openmp_flag || openacc_flag || openmp_cond_flag) |
| { |
| if (gfc_current_locus.nextc) |
| gfc_current_locus.nextc--; |
| } |
| else |
| { |
| c = ' '; |
| gfc_current_locus = old_loc; |
| goto done; |
| } |
| } |
| } |
| else /* Fixed form. */ |
| { |
| /* Fixed form continuation. */ |
| if (in_string != INSTRING_WARN && 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; |
| |
| /* Check to see if the continuation line was truncated. */ |
| if (warn_line_truncation && gfc_current_locus.lb != NULL |
| && gfc_current_locus.lb->truncated) |
| { |
| gfc_current_locus.lb->truncated = 0; |
| gfc_warning_now (OPT_Wline_truncation, |
| "Line truncated at %L", &gfc_current_locus); |
| } |
| |
| if (flag_openmp) |
| prev_openmp_flag = openmp_flag; |
| if (flag_openacc) |
| prev_openacc_flag = openacc_flag; |
| |
| continue_flag = 1; |
| old_loc = gfc_current_locus; |
| |
| gfc_advance_line (); |
| skip_fixed_comments (); |
| |
| /* See if this line is a continuation line. */ |
| if (flag_openmp && openmp_flag != prev_openmp_flag && !openacc_flag) |
| { |
| openmp_flag = prev_openmp_flag; |
| goto not_continuation; |
| } |
| if (flag_openacc && openacc_flag != prev_openacc_flag && !openmp_flag) |
| { |
| openacc_flag = prev_openacc_flag; |
| goto not_continuation; |
| } |
| |
| /* In case we have an OpenMP directive continued by OpenACC |
| sentinel, or vice versa, we get both openmp_flag and |
| openacc_flag on. */ |
| if (openacc_flag && openmp_flag) |
| { |
| int is_openmp = 0; |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (gfc_wide_tolower (c) != (unsigned char) "*$acc"[i]) |
| is_openmp = 1; |
| } |
| gfc_error (is_openmp |
| ? G_("Wrong OpenACC continuation at %C: " |
| "expected !$ACC, got !$OMP") |
| : G_("Wrong OpenMP continuation at %C: " |
| "expected !$OMP, got !$ACC")); |
| } |
| else if (!openmp_flag && !openacc_flag) |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (c != ' ') |
| goto not_continuation; |
| } |
| else if (openmp_flag) |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (gfc_wide_tolower (c) != (unsigned char) "*$omp"[i]) |
| goto not_continuation; |
| } |
| else if (openacc_flag) |
| for (i = 0; i < 5; i++) |
| { |
| c = next_char (); |
| if (gfc_wide_tolower (c) != (unsigned char) "*$acc"[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_linebuf_linenum (gfc_current_locus.lb) == continue_line + 1) |
| { |
| if (++continue_count == gfc_option.max_continue_fixed) |
| { |
| if (gfc_notification_std (GFC_STD_GNU) || pedantic) |
| gfc_warning (0, "Limit of %d continuations exceeded in " |
| "statement at %C", |
| gfc_option.max_continue_fixed); |
| } |
| } |
| |
| if (gfc_current_locus.lb != NULL |
| && continue_line < gfc_linebuf_linenum (gfc_current_locus.lb)) |
| continue_line = gfc_linebuf_linenum (gfc_current_locus.lb); |
| } |
| |
| /* 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; |
| end_flag = 0; |
| |
| 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(). */ |
| |
| gfc_char_t |
| gfc_next_char (void) |
| { |
| gfc_char_t c; |
| |
| do |
| { |
| c = gfc_next_char_literal (NONSTRING); |
| } |
| while (gfc_current_form == FORM_FIXED && gfc_is_whitespace (c)); |
| |
| return gfc_wide_tolower (c); |
| } |
| |
| char |
| gfc_next_ascii_char (void) |
| { |
| gfc_char_t c = gfc_next_char (); |
| |
| return (gfc_wide_fits_in_byte (c) ? (unsigned char) c |
| : (unsigned char) UCHAR_MAX); |
| } |
| |
| |
| gfc_char_t |
| gfc_peek_char (void) |
| { |
| locus old_loc; |
| gfc_char_t c; |
| |
| old_loc = gfc_current_locus; |
| c = gfc_next_char (); |
| gfc_current_locus = old_loc; |
| |
| return c; |
| } |
| |
| |
| char |
| gfc_peek_ascii_char (void) |
| { |
| gfc_char_t c = gfc_peek_char (); |
| |
| return (gfc_wide_fits_in_byte (c) ? (unsigned char) c |
| : (unsigned char) UCHAR_MAX); |
| } |
| |
| |
| /* 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) |
| { |
| gfc_char_t 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; |
| gfc_char_t c; |
| |
| do |
| { |
| old_loc = gfc_current_locus; |
| c = gfc_next_char_literal (NONSTRING); |
| /* 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 (warn_tabs && c == '\t') |
| { |
| int cur_linenum = LOCATION_LINE (gfc_current_locus.lb->location); |
| if (cur_linenum != linenum) |
| { |
| linenum = cur_linenum; |
| gfc_warning_now (OPT_Wtabs, "Nonconforming tab character at %C"); |
| } |
| } |
| } |
| while (gfc_is_whitespace (c)); |
| |
| if (!ISPRINT(c) && c != '\n' && last_error_char != gfc_current_locus.nextc) |
| { |
| char buf[20]; |
| last_error_char = gfc_current_locus.nextc; |
| snprintf (buf, 20, "%2.2X", c); |
| gfc_error_now ("Invalid character 0x%s at %C", buf); |
| } |
| |
| 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. |
| |
| If first_char is not NULL, it's a pointer to a single char value holding |
| the first character of the line, which has already been read by the |
| caller. This avoids the use of ungetc(). |
| |
| 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, gfc_char_t **pbuf, int *pbuflen, const int *first_char) |
| { |
| 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, quoted = ' '; |
| gfc_char_t *buffer; |
| bool found_tab = false; |
| |
| /* Determine the maximum allowed line length. */ |
| if (gfc_current_form == FORM_FREE) |
| maxlen = flag_free_line_length; |
| else if (gfc_current_form == FORM_FIXED) |
| maxlen = flag_fixed_line_length; |
| else |
| maxlen = 72; |
| |
| if (*pbuf == NULL) |
| { |
| /* Allocate the line buffer, storing its length into buflen. |
| Note that if maxlen==0, indicating that arbitrary-length lines |
| are allowed, the buffer will be reallocated if this length is |
| insufficient; since 132 characters is the length of a standard |
| free-form line, we use that as a starting guess. */ |
| if (maxlen > 0) |
| buflen = maxlen; |
| else |
| buflen = 132; |
| |
| *pbuf = gfc_get_wide_string (buflen + 1); |
| } |
| |
| i = 0; |
| buffer = *pbuf; |
| |
| if (first_char) |
| c = *first_char; |
| else |
| c = getc (input); |
| |
| /* In order to not truncate preprocessor lines, we have to |
| remember that this is one. */ |
| preprocessor_flag = (c == '#' ? 1 : 0); |
| |
| for (;;) |
| { |
| 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 (0, "%<&%> not allowed by itself in line %d", |
| current_line); |
| } |
| break; |
| } |
| |
| if (c == '\r' || c == '\0') |
| goto next_char; /* Gobble characters. */ |
| |
| if (c == '&') |
| { |
| if (seen_ampersand) |
| { |
| seen_ampersand = 0; |
| seen_printable = 1; |
| } |
| else |
| seen_ampersand = 1; |
| } |
| |
| if ((c != '&' && c != '!' && c != ' ') || (c == '!' && !seen_ampersand)) |
| 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 (quoted == ' ') |
| { |
| if (c == '\'' || c == '"') |
| quoted = c; |
| } |
| else if (c == quoted) |
| quoted = ' '; |
| |
| /* Is this a free-form comment? */ |
| if (c == '!' && quoted == ' ') |
| seen_comment = 1; |
| |
| /* Vendor extension: "<tab>1" marks a continuation line. */ |
| if (found_tab) |
| { |
| found_tab = false; |
| if (c >= '1' && c <= '9') |
| { |
| *(buffer-1) = c; |
| goto next_char; |
| } |
| } |
| |
| if (gfc_current_form == FORM_FIXED && c == '\t' && i < 6) |
| { |
| found_tab = true; |
| |
| if (warn_tabs && seen_comment == 0 && current_line != linenum) |
| { |
| linenum = current_line; |
| gfc_warning_now (OPT_Wtabs, |
| "Nonconforming tab character in column %d " |
| "of line %d", i+1, linenum); |
| } |
| |
| while (i < 6) |
| { |
| *buffer++ = ' '; |
| i++; |
| } |
| |
| goto next_char; |
| } |
| |
| *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 = XRESIZEVEC (gfc_char_t, *pbuf, (buflen + 1)); |
| buffer = (*pbuf) + i; |
| } |
| } |
| else if (i >= maxlen) |
| { |
| bool trunc_warn = true; |
| |
| /* Enhancement, if the very next non-space character is an ampersand |
| or comment that we would otherwise warn about, don't mark as |
| truncated. */ |
| |
| /* Truncate the rest of the line. */ |
| for (;;) |
| { |
| c = getc (input); |
| if (c == '\r' || c == ' ') |
| continue; |
| |
| if (c == '\n' || c == EOF) |
| break; |
| |
| if (!trunc_warn && c != '!') |
| trunc_warn = true; |
| |
| if (trunc_warn && ((gfc_current_form == FORM_FIXED && c == '&') |
| || c == '!')) |
| trunc_warn = false; |
| |
| if (c == '!') |
| seen_comment = 1; |
| |
| if (trunc_warn && !seen_comment) |
| trunc_flag = 1; |
| } |
| |
| c = '\n'; |
| continue; |
| } |
| |
| next_char: |
| c = getc (input); |
| } |
| |
| /* Pad lines to the selected line length in fixed form. */ |
| if (gfc_current_form == FORM_FIXED |
| && flag_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 = XCNEW (gfc_file); |
| |
| f->filename = xstrdup (name); |
| |
| f->next = file_head; |
| file_head = f; |
| |
| f->up = current_file; |
| if (current_file != NULL) |
| f->inclusion_line = current_file->line; |
| |
| linemap_add (line_table, reason, false, f->filename, 1); |
| |
| return f; |
| } |
| |
| |
| /* Deal with a line from the C preprocessor. The |
| initial octothorp has already been seen. */ |
| |
| static void |
| preprocessor_line (gfc_char_t *c) |
| { |
| bool flag[5]; |
| int i, line; |
| gfc_char_t *wide_filename; |
| gfc_file *f; |
| int escaped, unescape; |
| char *filename; |
| |
| c++; |
| while (*c == ' ' || *c == '\t') |
| c++; |
| |
| if (*c < '0' || *c > '9') |
| goto bad_cpp_line; |
| |
| line = wide_atoi (c); |
| |
| c = wide_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; |
| |
| wide_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) |
| { |
| gfc_char_t *s = wide_filename; |
| gfc_char_t *d = gfc_get_wide_string (c - wide_filename - unescape); |
| |
| wide_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 = wide_strchr (c, ' '); |
| if (c == NULL) |
| break; |
| |
| c++; |
| i = wide_atoi (c); |
| |
| if (i >= 1 && i <= 4) |
| flag[i] = true; |
| } |
| |
| /* Convert the filename in wide characters into a filename in narrow |
| characters. */ |
| filename = gfc_widechar_to_char (wide_filename, -1); |
| |
| /* Interpret flags. */ |
| |
| if (flag[1]) /* Starting new file. */ |
| { |
| f = get_file (filename, LC_RENAME); |
| add_file_change (f->filename, f->inclusion_line); |
| current_file = f; |
| } |
| |
| if (flag[2]) /* Ending current file. */ |
| { |
| if (!current_file->up |
| || filename_cmp (current_file->up->filename, filename) != 0) |
| { |
| linemap_line_start (line_table, current_file->line, 80); |
| /* ??? One could compute the exact column where the filename |
| starts and compute the exact location here. */ |
| gfc_warning_now_at (linemap_position_for_column (line_table, 1), |
| 0, "file %qs left but not entered", |
| filename); |
| current_file->line++; |
| if (unescape) |
| free (wide_filename); |
| free (filename); |
| return; |
| } |
| |
| add_file_change (NULL, line); |
| current_file = current_file->up; |
| linemap_add (line_table, LC_RENAME, false, current_file->filename, |
| current_file->line); |
| } |
| |
| /* The name of the file can be a temporary file produced by |
| cpp. Replace the name if it is different. */ |
| |
| if (filename_cmp (current_file->filename, filename) != 0) |
| { |
| /* FIXME: we leak the old filename because a pointer to it may be stored |
| in the linemap. Alternative could be using GC or updating linemap to |
| point to the new name, but there is no API for that currently. */ |
| current_file->filename = xstrdup (filename); |
| } |
| |
| /* Set new line number. */ |
| current_file->line = line; |
| if (unescape) |
| free (wide_filename); |
| free (filename); |
| return; |
| |
| bad_cpp_line: |
| linemap_line_start (line_table, current_file->line, 80); |
| /* ??? One could compute the exact column where the directive |
| starts and compute the exact location here. */ |
| gfc_warning_now_at (linemap_position_for_column (line_table, 2), 0, |
| "Illegal preprocessor directive"); |
| current_file->line++; |
| } |
| |
| |
| static bool load_file (const char *, 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 (gfc_char_t *line) |
| { |
| gfc_char_t quote, *c, *begin, *stop; |
| char *filename; |
| |
| c = line; |
| |
| if (flag_openmp || flag_openmp_simd) |
| { |
| 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 (gfc_wide_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. */ |
| |
| filename = gfc_widechar_to_char (begin, -1); |
| if (!load_file (filename, NULL, false)) |
| exit (FATAL_EXIT_CODE); |
| |
| free (filename); |
| return true; |
| } |
| |
| |
| /* Load a file into memory by calling load_line until the file ends. */ |
| |
| static bool |
| load_file (const char *realfilename, const char *displayedname, bool initial) |
| { |
| gfc_char_t *line; |
| gfc_linebuf *b; |
| gfc_file *f; |
| FILE *input; |
| int len, line_len; |
| bool first_line; |
| struct stat st; |
| int stat_result; |
| const char *filename; |
| /* If realfilename and displayedname are different and non-null then |
| surely realfilename is the preprocessed form of |
| displayedname. */ |
| bool preprocessed_p = (realfilename && displayedname |
| && strcmp (realfilename, displayedname)); |
| |
| filename = displayedname ? displayedname : realfilename; |
| |
| for (f = current_file; f; f = f->up) |
| if (filename_cmp (filename, f->filename) == 0) |
| { |
| fprintf (stderr, "%s:%d: Error: File '%s' is being included " |
| "recursively\n", current_file->filename, current_file->line, |
| filename); |
| return false; |
| } |
| |
| if (initial) |
| { |
| if (gfc_src_file) |
| { |
| input = gfc_src_file; |
| gfc_src_file = NULL; |
| } |
| else |
| input = gfc_open_file (realfilename); |
| |
| if (input == NULL) |
| { |
| gfc_error_now ("Can't open file %qs", filename); |
| return false; |
| } |
| } |
| else |
| { |
| input = gfc_open_included_file (realfilename, false, false); |
| if (input == NULL) |
| { |
| fprintf (stderr, "%s:%d: Error: Can't open included file '%s'\n", |
| current_file->filename, current_file->line, filename); |
| return false; |
| } |
| stat_result = stat (realfilename, &st); |
| if (stat_result == 0 && !S_ISREG(st.st_mode)) |
| { |
| fprintf (stderr, "%s:%d: Error: Included path '%s'" |
| " is not a regular file\n", |
| current_file->filename, current_file->line, filename); |
| fclose (input); |
| return false; |
| } |
| } |
| |
| /* Load the file. |
| |
| A "non-initial" file means a file that is being included. In |
| that case we are creating an LC_ENTER map. |
| |
| An "initial" file means a main file; one that is not included. |
| That file has already got at least one (surely more) line map(s) |
| created by gfc_init. So the subsequent map created in that case |
| must have LC_RENAME reason. |
| |
| This latter case is not true for a preprocessed file. In that |
| case, although the file is "initial", the line maps created by |
| gfc_init was used during the preprocessing of the file. Now that |
| the preprocessing is over and we are being fed the result of that |
| preprocessing, we need to create a brand new line map for the |
| preprocessed file, so the reason is going to be LC_ENTER. */ |
| |
| f = get_file (filename, (initial && !preprocessed_p) ? LC_RENAME : LC_ENTER); |
| if (!initial) |
| add_file_change (f->filename, f->inclusion_line); |
| current_file = f; |
| current_file->line = 1; |
| line = NULL; |
| line_len = 0; |
| first_line = true; |
| |
| if (initial && gfc_src_preprocessor_lines[0]) |
| { |
| preprocessor_line (gfc_src_preprocessor_lines[0]); |
| 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]); |
| free (gfc_src_preprocessor_lines[1]); |
| gfc_src_preprocessor_lines[1] = NULL; |
| } |
| } |
| |
| for (;;) |
| { |
| int trunc = load_line (input, &line, &line_len, NULL); |
| |
| len = gfc_wide_strlen (line); |
| if (feof (input) && len == 0) |
| break; |
| |
| /* If this is the first line of the file, it can contain a byte |
| order mark (BOM), which we will ignore: |
| FF FE is UTF-16 little endian, |
| FE FF is UTF-16 big endian, |
| EF BB BF is UTF-8. */ |
| if (first_line |
| && ((line_len >= 2 && line[0] == (unsigned char) '\xFF' |
| && line[1] == (unsigned char) '\xFE') |
| || (line_len >= 2 && line[0] == (unsigned char) '\xFE' |
| && line[1] == (unsigned char) '\xFF') |
| || (line_len >= 3 && line[0] == (unsigned char) '\xEF' |
| && line[1] == (unsigned char) '\xBB' |
| && line[2] == (unsigned char) '\xBF'))) |
| { |
| int n = line[1] == (unsigned char) '\xBB' ? 3 : 2; |
| gfc_char_t *new_char = gfc_get_wide_string (line_len); |
| |
| wide_strcpy (new_char, &line[n]); |
| free (line); |
| line = new_char; |
| len -= n; |
| } |
| |
| /* There are three things this line can be: a line of Fortran |
| source, an include line or a C preprocessor directive. */ |
| |
| if (line[0] == '#') |
| { |
| /* When -g3 is specified, it's possible that we emit #define |
| and #undef lines, which we need to pass to the middle-end |
| so that it can emit correct debug info. */ |
| if (debug_info_level == DINFO_LEVEL_VERBOSE |
| && (wide_strncmp (line, "#define ", 8) == 0 |
| || wide_strncmp (line, "#undef ", 7) == 0)) |
| ; |
| else |
| { |
| preprocessor_line (line); |
| continue; |
| } |
| } |
| |
| /* Preprocessed files have preprocessor lines added before the byte |
| order mark, so first_line is not about the first line of the file |
| but the first line that's not a preprocessor line. */ |
| first_line = false; |
| |
| if (include_line (line)) |
| { |
| current_file->line++; |
| continue; |
| } |
| |
| /* Add line. */ |
| |
| b = XCNEWVAR (gfc_linebuf, gfc_linebuf_header_size |
| + (len + 1) * sizeof (gfc_char_t)); |
| |
| |
| b->location |
| = linemap_line_start (line_table, current_file->line++, len); |
| /* ??? We add the location for the maximum column possible here, |
| because otherwise if the next call creates a new line-map, it |
| will not reserve space for any offset. */ |
| if (len > 0) |
| linemap_position_for_column (line_table, len); |
| |
| b->file = current_file; |
| b->truncated = trunc; |
| wide_strcpy (b->line, line); |
| |
| if (line_head == NULL) |
| line_head = b; |
| else |
| line_tail->next = b; |
| |
| line_tail = b; |
| |
| while (file_changes_cur < file_changes_count) |
| file_changes[file_changes_cur++].lb = b; |
| } |
| |
| /* Release the line buffer allocated in load_line. */ |
| free (line); |
| |
| fclose (input); |
| |
| if (!initial) |
| add_file_change (NULL, current_file->inclusion_line + 1); |
| current_file = current_file->up; |
| linemap_add (line_table, LC_LEAVE, 0, NULL, 0); |
| return true; |
| } |
| |
| |
| /* Open a new file and start scanning from that file. Returns true |
| if everything went OK, false otherwise. If form == FORM_UNKNOWN |
| it tries to determine the source form from the filename, defaulting |
| to free form. */ |
| |
| bool |
| gfc_new_file (void) |
| { |
| bool result; |
| |
| if (gfc_cpp_enabled ()) |
| { |
| result = gfc_cpp_preprocess (gfc_source_file); |
| if (!gfc_cpp_preprocess_only ()) |
| result = load_file (gfc_cpp_temporary_file (), gfc_source_file, true); |
| } |
| else |
| result = load_file (gfc_source_file, NULL, 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) |
| printf ("%s:%3d %s\n", LOCATION_FILE (line_head->location), |
| LOCATION_LINE (line_head->location), line_head->line); |
| |
| exit (SUCCESS_EXIT_CODE); |
| #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 = XCNEWVEC (char, 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, *tmp; |
| |
| gfc_src_file = gfc_open_file (filename); |
| if (gfc_src_file == NULL) |
| return NULL; |
| |
| c = getc (gfc_src_file); |
| |
| if (c != '#') |
| return NULL; |
| |
| len = 0; |
| load_line (gfc_src_file, &gfc_src_preprocessor_lines[0], &len, &c); |
| |
| if (wide_strncmp (gfc_src_preprocessor_lines[0], "# 1 \"", 5) != 0) |
| return NULL; |
| |
| tmp = gfc_widechar_to_char (&gfc_src_preprocessor_lines[0][5], -1); |
| filename = unescape_filename (tmp); |
| free (tmp); |
| if (filename == NULL) |
| return NULL; |
| |
| c = getc (gfc_src_file); |
| |
| if (c != '#') |
| return filename; |
| |
| len = 0; |
| load_line (gfc_src_file, &gfc_src_preprocessor_lines[1], &len, &c); |
| |
| if (wide_strncmp (gfc_src_preprocessor_lines[1], "# 1 \"", 5) != 0) |
| return filename; |
| |
| tmp = gfc_widechar_to_char (&gfc_src_preprocessor_lines[1][5], -1); |
| dirname = unescape_filename (tmp); |
| free (tmp); |
| if (dirname == NULL) |
| return filename; |
| |
| len = strlen (dirname); |
| if (len < 3 || dirname[len - 1] != '/' || dirname[len - 2] != '/') |
| { |
| free (dirname); |
| return filename; |
| } |
| dirname[len - 2] = '\0'; |
| set_src_pwd (dirname); |
| |
| if (! IS_ABSOLUTE_PATH (filename)) |
| { |
| char *p = XCNEWVEC (char, len + strlen (filename)); |
| |
| memcpy (p, dirname, len - 2); |
| p[len - 2] = '/'; |
| strcpy (p + len - 1, filename); |
| *canon_source_file = p; |
| } |
| |
| free (dirname); |
| return filename; |
| } |