349 lines
9.7 KiB
C
349 lines
9.7 KiB
C
/* Map logical line numbers to (source file, line number) pairs.
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Copyright (C) 2001, 2003, 2004
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Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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#include "config.h"
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#include "system.h"
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#include "line-map.h"
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static void trace_include (const struct line_maps *, const struct line_map *);
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/* Initialize a line map set. */
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void
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linemap_init (struct line_maps *set)
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{
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set->maps = NULL;
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set->allocated = 0;
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set->used = 0;
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set->last_listed = -1;
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set->trace_includes = false;
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set->depth = 0;
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set->cache = 0;
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set->highest_location = 0;
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set->highest_line = 0;
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set->max_column_hint = 0;
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}
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/* Check for and warn about line_maps entered but not exited. */
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void
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linemap_check_files_exited (struct line_maps *set)
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{
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struct line_map *map;
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/* Depending upon whether we are handling preprocessed input or
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not, this can be a user error or an ICE. */
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for (map = &set->maps[set->used - 1]; ! MAIN_FILE_P (map);
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map = INCLUDED_FROM (set, map))
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fprintf (stderr, "line-map.c: file \"%s\" entered but not left\n",
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map->to_file);
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}
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/* Free a line map set. */
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void
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linemap_free (struct line_maps *set)
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{
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if (set->maps)
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{
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linemap_check_files_exited (set);
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free (set->maps);
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}
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}
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/* Add a mapping of logical source line to physical source file and
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line number.
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The text pointed to by TO_FILE must have a lifetime
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at least as long as the final call to lookup_line (). An empty
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TO_FILE means standard input. If reason is LC_LEAVE, and
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TO_FILE is NULL, then TO_FILE, TO_LINE and SYSP are given their
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natural values considering the file we are returning to.
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FROM_LINE should be monotonic increasing across calls to this
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function. A call to this function can relocate the previous set of
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A call to this function can relocate the previous set of
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maps, so any stored line_map pointers should not be used. */
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const struct line_map *
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linemap_add (struct line_maps *set, enum lc_reason reason,
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unsigned int sysp, const char *to_file, unsigned int to_line)
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{
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struct line_map *map;
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source_location start_location = set->highest_location + 1;
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if (set->used && start_location < set->maps[set->used - 1].start_location)
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abort ();
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if (set->used == set->allocated)
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{
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set->allocated = 2 * set->allocated + 256;
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set->maps = XRESIZEVEC (struct line_map, set->maps, set->allocated);
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}
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map = &set->maps[set->used];
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if (to_file && *to_file == '\0')
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to_file = "<stdin>";
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/* If we don't keep our line maps consistent, we can easily
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segfault. Don't rely on the client to do it for us. */
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if (set->depth == 0)
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reason = LC_ENTER;
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else if (reason == LC_LEAVE)
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{
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struct line_map *from;
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bool error;
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if (MAIN_FILE_P (map - 1))
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{
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if (to_file == NULL)
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{
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set->depth--;
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return NULL;
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}
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error = true;
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reason = LC_RENAME;
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from = map - 1;
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}
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else
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{
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from = INCLUDED_FROM (set, map - 1);
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error = to_file && strcmp (from->to_file, to_file);
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}
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/* Depending upon whether we are handling preprocessed input or
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not, this can be a user error or an ICE. */
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if (error)
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fprintf (stderr, "line-map.c: file \"%s\" left but not entered\n",
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to_file);
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/* A TO_FILE of NULL is special - we use the natural values. */
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if (error || to_file == NULL)
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{
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to_file = from->to_file;
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to_line = SOURCE_LINE (from, from[1].start_location);
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sysp = from->sysp;
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}
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}
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map->reason = reason;
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map->sysp = sysp;
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map->start_location = start_location;
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map->to_file = to_file;
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map->to_line = to_line;
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set->cache = set->used++;
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map->column_bits = 0;
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set->highest_location = start_location;
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set->highest_line = start_location;
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set->max_column_hint = 0;
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if (reason == LC_ENTER)
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{
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map->included_from = set->depth == 0 ? -1 : (int) (set->used - 2);
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set->depth++;
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if (set->trace_includes)
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trace_include (set, map);
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}
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else if (reason == LC_RENAME)
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map->included_from = map[-1].included_from;
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else if (reason == LC_LEAVE)
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{
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set->depth--;
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map->included_from = INCLUDED_FROM (set, map - 1)->included_from;
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}
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return map;
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}
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source_location
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linemap_line_start (struct line_maps *set, unsigned int to_line,
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unsigned int max_column_hint)
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{
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struct line_map *map = &set->maps[set->used - 1];
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source_location highest = set->highest_location;
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source_location r;
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unsigned int last_line = SOURCE_LINE (map, set->highest_line);
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int line_delta = to_line - last_line;
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bool add_map = false;
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if (line_delta < 0
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|| (line_delta > 10 && line_delta * map->column_bits > 1000)
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|| (max_column_hint >= (1U << map->column_bits))
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|| (max_column_hint <= 80 && map->column_bits >= 10))
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{
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add_map = true;
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}
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else
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max_column_hint = set->max_column_hint;
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if (add_map)
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{
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int column_bits;
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if (max_column_hint > 100000 || highest > 0xC0000000)
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{
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/* If the column number is ridiculous or we've allocated a huge
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number of source_locations, give up on column numbers. */
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max_column_hint = 0;
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if (highest >0xF0000000)
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return 0;
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column_bits = 0;
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}
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else
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{
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column_bits = 7;
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while (max_column_hint >= (1U << column_bits))
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column_bits++;
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max_column_hint = 1U << column_bits;
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}
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/* Allocate the new line_map. However, if the current map only has a
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single line we can sometimes just increase its column_bits instead. */
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if (line_delta < 0
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|| last_line != map->to_line
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|| SOURCE_COLUMN (map, highest) >= (1U << column_bits))
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map = (struct line_map*) linemap_add (set, LC_RENAME, map->sysp,
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map->to_file, to_line);
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map->column_bits = column_bits;
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r = map->start_location + ((to_line - map->to_line) << column_bits);
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}
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else
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r = highest - SOURCE_COLUMN (map, highest)
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+ (line_delta << map->column_bits);
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set->highest_line = r;
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if (r > set->highest_location)
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set->highest_location = r;
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set->max_column_hint = max_column_hint;
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return r;
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}
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source_location
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linemap_position_for_column (struct line_maps *set, unsigned int to_column)
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{
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source_location r = set->highest_line;
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if (to_column >= set->max_column_hint)
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{
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if (r >= 0xC000000 || to_column > 100000)
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{
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/* Running low on source_locations - disable column numbers. */
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return r;
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}
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else
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{
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struct line_map *map = &set->maps[set->used - 1];
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r = linemap_line_start (set, SOURCE_LINE (map, r), to_column + 50);
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}
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}
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r = r + to_column;
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if (r >= set->highest_location)
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set->highest_location = r;
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return r;
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}
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/* Given a logical line, returns the map from which the corresponding
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(source file, line) pair can be deduced. Since the set is built
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chronologically, the logical lines are monotonic increasing, and so
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the list is sorted and we can use a binary search. */
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const struct line_map *
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linemap_lookup (struct line_maps *set, source_location line)
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{
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unsigned int md, mn, mx;
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const struct line_map *cached;
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mn = set->cache;
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mx = set->used;
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cached = &set->maps[mn];
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/* We should get a segfault if no line_maps have been added yet. */
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if (line >= cached->start_location)
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{
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if (mn + 1 == mx || line < cached[1].start_location)
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return cached;
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}
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else
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{
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mx = mn;
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mn = 0;
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}
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while (mx - mn > 1)
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{
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md = (mn + mx) / 2;
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if (set->maps[md].start_location > line)
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mx = md;
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else
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mn = md;
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}
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set->cache = mn;
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return &set->maps[mn];
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}
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/* Print the file names and line numbers of the #include commands
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which led to the map MAP, if any, to stderr. Nothing is output if
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the most recently listed stack is the same as the current one. */
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void
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linemap_print_containing_files (struct line_maps *set,
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const struct line_map *map)
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{
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if (MAIN_FILE_P (map) || set->last_listed == map->included_from)
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return;
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set->last_listed = map->included_from;
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map = INCLUDED_FROM (set, map);
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fprintf (stderr, _("In file included from %s:%u"),
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map->to_file, LAST_SOURCE_LINE (map));
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while (! MAIN_FILE_P (map))
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{
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map = INCLUDED_FROM (set, map);
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/* Translators note: this message is used in conjunction
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with "In file included from %s:%ld" and some other
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tricks. We want something like this:
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| In file included from sys/select.h:123,
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| from sys/types.h:234,
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| from userfile.c:31:
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| bits/select.h:45: <error message here>
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with all the "from"s lined up.
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The trailing comma is at the beginning of this message,
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and the trailing colon is not translated. */
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fprintf (stderr, _(",\n from %s:%u"),
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map->to_file, LAST_SOURCE_LINE (map));
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}
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fputs (":\n", stderr);
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}
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/* Print an include trace, for e.g. the -H option of the preprocessor. */
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static void
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trace_include (const struct line_maps *set, const struct line_map *map)
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{
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unsigned int i = set->depth;
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while (--i)
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putc ('.', stderr);
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fprintf (stderr, " %s\n", map->to_file);
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}
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