274 lines
9.2 KiB
C
274 lines
9.2 KiB
C
/* Data and functions related to line maps and input files.
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Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011, 2012
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "intl.h"
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#include "input.h"
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/* Current position in real source file. */
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location_t input_location;
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struct line_maps *line_table;
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/* Expand the source location LOC into a human readable location. If
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LOC resolves to a builtin location, the file name of the readable
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location is set to the string "<built-in>". If EXPANSION_POINT_P is
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TRUE and LOC is virtual, then it is resolved to the expansion
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point of the involved macro. Otherwise, it is resolved to the
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spelling location of the token.
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When resolving to the spelling location of the token, if the
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resulting location is for a built-in location (that is, it has no
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associated line/column) in the context of a macro expansion, the
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returned location is the first one (while unwinding the macro
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location towards its expansion point) that is in real source
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code. */
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static expanded_location
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expand_location_1 (source_location loc,
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bool expansion_point_p)
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{
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expanded_location xloc;
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const struct line_map *map;
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enum location_resolution_kind lrk = LRK_MACRO_EXPANSION_POINT;
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memset (&xloc, 0, sizeof (xloc));
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if (loc >= RESERVED_LOCATION_COUNT)
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{
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if (!expansion_point_p)
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{
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/* We want to resolve LOC to its spelling location.
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But if that spelling location is a reserved location that
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appears in the context of a macro expansion (like for a
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location for a built-in token), let's consider the first
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location (toward the expansion point) that is not reserved;
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that is, the first location that is in real source code. */
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loc = linemap_unwind_to_first_non_reserved_loc (line_table,
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loc, &map);
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lrk = LRK_SPELLING_LOCATION;
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}
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loc = linemap_resolve_location (line_table, loc,
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lrk, &map);
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xloc = linemap_expand_location (line_table, map, loc);
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}
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if (loc <= BUILTINS_LOCATION)
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xloc.file = loc == UNKNOWN_LOCATION ? NULL : _("<built-in>");
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return xloc;
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}
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/* Reads one line from file into a static buffer. */
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static const char *
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read_line (FILE *file)
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{
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static char *string;
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static size_t string_len;
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size_t pos = 0;
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char *ptr;
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if (!string_len)
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{
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string_len = 200;
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string = XNEWVEC (char, string_len);
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}
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while ((ptr = fgets (string + pos, string_len - pos, file)))
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{
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size_t len = strlen (string + pos);
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if (string[pos + len - 1] == '\n')
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{
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string[pos + len - 1] = 0;
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return string;
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}
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pos += len;
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string = XRESIZEVEC (char, string, string_len * 2);
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string_len *= 2;
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}
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return pos ? string : NULL;
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}
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/* Return the physical source line that corresponds to xloc in a
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buffer that is statically allocated. The newline is replaced by
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the null character. */
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const char *
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location_get_source_line (expanded_location xloc)
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{
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const char *buffer;
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int lines = 1;
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FILE *stream = xloc.file ? fopen (xloc.file, "r") : NULL;
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if (!stream)
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return NULL;
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while ((buffer = read_line (stream)) && lines < xloc.line)
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lines++;
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fclose (stream);
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return buffer;
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}
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/* Expand the source location LOC into a human readable location. If
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LOC is virtual, it resolves to the expansion point of the involved
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macro. If LOC resolves to a builtin location, the file name of the
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readable location is set to the string "<built-in>". */
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expanded_location
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expand_location (source_location loc)
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{
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return expand_location_1 (loc, /*expansion_point_p=*/true);
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}
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/* Expand the source location LOC into a human readable location. If
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LOC is virtual, it resolves to the expansion location of the
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relevant macro. If LOC resolves to a builtin location, the file
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name of the readable location is set to the string
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"<built-in>". */
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expanded_location
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expand_location_to_spelling_point (source_location loc)
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{
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return expand_location_1 (loc, /*expansion_piont_p=*/false);
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}
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/* If LOCATION is in a system header and if it's a virtual location for
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a token coming from the expansion of a macro M, unwind it to the
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location of the expansion point of M. Otherwise, just return
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LOCATION.
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This is used for instance when we want to emit diagnostics about a
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token that is located in a macro that is itself defined in a system
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header -- e.g for the NULL macro. In that case, if LOCATION is
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passed to diagnostics emitting functions like warning_at as is, no
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diagnostic won't be emitted. */
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source_location
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expansion_point_location_if_in_system_header (source_location location)
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{
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if (in_system_header_at (location))
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location = linemap_resolve_location (line_table, location,
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LRK_MACRO_EXPANSION_POINT,
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NULL);
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return location;
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}
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#define ONE_K 1024
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#define ONE_M (ONE_K * ONE_K)
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/* Display a number as an integer multiple of either:
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- 1024, if said integer is >= to 10 K (in base 2)
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- 1024 * 1024, if said integer is >= 10 M in (base 2)
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*/
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#define SCALE(x) ((unsigned long) ((x) < 10 * ONE_K \
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? (x) \
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: ((x) < 10 * ONE_M \
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? (x) / ONE_K \
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: (x) / ONE_M)))
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/* For a given integer, display either:
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- the character 'k', if the number is higher than 10 K (in base 2)
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but strictly lower than 10 M (in base 2)
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- the character 'M' if the number is higher than 10 M (in base2)
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- the charcter ' ' if the number is strictly lower than 10 K */
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#define STAT_LABEL(x) ((x) < 10 * ONE_K ? ' ' : ((x) < 10 * ONE_M ? 'k' : 'M'))
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/* Display an integer amount as multiple of 1K or 1M (in base 2).
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Display the correct unit (either k, M, or ' ') after the amout, as
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well. */
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#define FORMAT_AMOUNT(size) SCALE (size), STAT_LABEL (size)
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/* Dump statistics to stderr about the memory usage of the line_table
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set of line maps. This also displays some statistics about macro
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expansion. */
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void
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dump_line_table_statistics (void)
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{
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struct linemap_stats s;
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long total_used_map_size,
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macro_maps_size,
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total_allocated_map_size;
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memset (&s, 0, sizeof (s));
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linemap_get_statistics (line_table, &s);
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macro_maps_size = s.macro_maps_used_size
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+ s.macro_maps_locations_size;
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total_allocated_map_size = s.ordinary_maps_allocated_size
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+ s.macro_maps_allocated_size
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+ s.macro_maps_locations_size;
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total_used_map_size = s.ordinary_maps_used_size
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+ s.macro_maps_used_size
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+ s.macro_maps_locations_size;
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fprintf (stderr, "Number of expanded macros: %5ld\n",
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s.num_expanded_macros);
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if (s.num_expanded_macros != 0)
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fprintf (stderr, "Average number of tokens per macro expansion: %5ld\n",
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s.num_macro_tokens / s.num_expanded_macros);
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fprintf (stderr,
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"\nLine Table allocations during the "
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"compilation process\n");
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fprintf (stderr, "Number of ordinary maps used: %5ld%c\n",
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SCALE (s.num_ordinary_maps_used),
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STAT_LABEL (s.num_ordinary_maps_used));
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fprintf (stderr, "Ordinary map used size: %5ld%c\n",
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SCALE (s.ordinary_maps_used_size),
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STAT_LABEL (s.ordinary_maps_used_size));
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fprintf (stderr, "Number of ordinary maps allocated: %5ld%c\n",
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SCALE (s.num_ordinary_maps_allocated),
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STAT_LABEL (s.num_ordinary_maps_allocated));
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fprintf (stderr, "Ordinary maps allocated size: %5ld%c\n",
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SCALE (s.ordinary_maps_allocated_size),
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STAT_LABEL (s.ordinary_maps_allocated_size));
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fprintf (stderr, "Number of macro maps used: %5ld%c\n",
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SCALE (s.num_macro_maps_used),
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STAT_LABEL (s.num_macro_maps_used));
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fprintf (stderr, "Macro maps used size: %5ld%c\n",
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SCALE (s.macro_maps_used_size),
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STAT_LABEL (s.macro_maps_used_size));
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fprintf (stderr, "Macro maps locations size: %5ld%c\n",
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SCALE (s.macro_maps_locations_size),
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STAT_LABEL (s.macro_maps_locations_size));
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fprintf (stderr, "Macro maps size: %5ld%c\n",
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SCALE (macro_maps_size),
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STAT_LABEL (macro_maps_size));
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fprintf (stderr, "Duplicated maps locations size: %5ld%c\n",
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SCALE (s.duplicated_macro_maps_locations_size),
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STAT_LABEL (s.duplicated_macro_maps_locations_size));
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fprintf (stderr, "Total allocated maps size: %5ld%c\n",
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SCALE (total_allocated_map_size),
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STAT_LABEL (total_allocated_map_size));
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fprintf (stderr, "Total used maps size: %5ld%c\n",
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SCALE (total_used_map_size),
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STAT_LABEL (total_used_map_size));
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fprintf (stderr, "\n");
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}
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