885 lines
29 KiB
C
885 lines
29 KiB
C
/* CPP Library.
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Copyright (C) 1986-2021 Free Software Foundation, Inc.
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Contributed by Per Bothner, 1994-95.
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Based on CCCP program by Paul Rubin, June 1986
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Adapted to ANSI C, Richard Stallman, Jan 1987
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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 3, 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; 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 "cpplib.h"
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#include "internal.h"
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#include "mkdeps.h"
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#include "localedir.h"
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#include "filenames.h"
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#ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
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#ifdef HAVE_DOS_BASED_FILE_SYSTEM
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#define ENABLE_CANONICAL_SYSTEM_HEADERS 1
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#else
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#define ENABLE_CANONICAL_SYSTEM_HEADERS 0
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#endif
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#endif
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static void init_library (void);
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static void mark_named_operators (cpp_reader *, int);
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static bool read_original_filename (cpp_reader *);
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static void read_original_directory (cpp_reader *);
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static void post_options (cpp_reader *);
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/* If we have designated initializers (GCC >2.7) these tables can be
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initialized, constant data. Otherwise, they have to be filled in at
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runtime. */
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#if HAVE_DESIGNATED_INITIALIZERS
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#define init_trigraph_map() /* Nothing. */
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#define TRIGRAPH_MAP \
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__extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
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#define END };
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#define s(p, v) [p] = v,
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#else
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#define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
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static void init_trigraph_map (void) { \
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unsigned char *x = _cpp_trigraph_map;
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#define END }
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#define s(p, v) x[p] = v;
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#endif
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TRIGRAPH_MAP
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s('=', '#') s(')', ']') s('!', '|')
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s('(', '[') s('\'', '^') s('>', '}')
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s('/', '\\') s('<', '{') s('-', '~')
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END
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#undef s
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#undef END
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#undef TRIGRAPH_MAP
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/* A set of booleans indicating what CPP features each source language
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requires. */
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struct lang_flags
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{
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char c99;
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char cplusplus;
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char extended_numbers;
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char extended_identifiers;
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char c11_identifiers;
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char std;
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char digraphs;
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char uliterals;
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char rliterals;
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char user_literals;
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char binary_constants;
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char digit_separators;
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char trigraphs;
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char utf8_char_literals;
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char va_opt;
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char scope;
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char dfp_constants;
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};
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static const struct lang_flags lang_defaults[] =
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{ /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp */
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/* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
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/* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
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/* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
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/* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
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/* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1 },
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/* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
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/* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
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/* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
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/* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
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/* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
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/* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1 },
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/* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
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/* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0 },
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/* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0 },
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/* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 },
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/* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0 },
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/* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0 },
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/* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
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/* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 },
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/* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
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/* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
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/* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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};
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/* Sets internal flags correctly for a given language. */
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void
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cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
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{
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const struct lang_flags *l = &lang_defaults[(int) lang];
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CPP_OPTION (pfile, lang) = lang;
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CPP_OPTION (pfile, c99) = l->c99;
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CPP_OPTION (pfile, cplusplus) = l->cplusplus;
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CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
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CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
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CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
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CPP_OPTION (pfile, std) = l->std;
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CPP_OPTION (pfile, digraphs) = l->digraphs;
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CPP_OPTION (pfile, uliterals) = l->uliterals;
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CPP_OPTION (pfile, rliterals) = l->rliterals;
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CPP_OPTION (pfile, user_literals) = l->user_literals;
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CPP_OPTION (pfile, binary_constants) = l->binary_constants;
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CPP_OPTION (pfile, digit_separators) = l->digit_separators;
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CPP_OPTION (pfile, trigraphs) = l->trigraphs;
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CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
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CPP_OPTION (pfile, va_opt) = l->va_opt;
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CPP_OPTION (pfile, scope) = l->scope;
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CPP_OPTION (pfile, dfp_constants) = l->dfp_constants;
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}
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/* Initialize library global state. */
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static void
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init_library (void)
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{
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static int initialized = 0;
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if (! initialized)
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{
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initialized = 1;
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_cpp_init_lexer ();
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/* Set up the trigraph map. This doesn't need to do anything if
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we were compiled with a compiler that supports C99 designated
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initializers. */
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init_trigraph_map ();
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#ifdef ENABLE_NLS
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(void) bindtextdomain (PACKAGE, LOCALEDIR);
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#endif
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}
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}
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/* Initialize a cpp_reader structure. */
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cpp_reader *
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cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
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class line_maps *line_table)
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{
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cpp_reader *pfile;
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/* Initialize this instance of the library if it hasn't been already. */
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init_library ();
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pfile = XCNEW (cpp_reader);
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memset (&pfile->base_context, 0, sizeof (pfile->base_context));
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cpp_set_lang (pfile, lang);
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CPP_OPTION (pfile, warn_multichar) = 1;
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CPP_OPTION (pfile, discard_comments) = 1;
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CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
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CPP_OPTION (pfile, max_include_depth) = 200;
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CPP_OPTION (pfile, operator_names) = 1;
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CPP_OPTION (pfile, warn_trigraphs) = 2;
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CPP_OPTION (pfile, warn_endif_labels) = 1;
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CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
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CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1;
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CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
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CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
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CPP_OPTION (pfile, cpp_warn_long_long) = 0;
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CPP_OPTION (pfile, dollars_in_ident) = 1;
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CPP_OPTION (pfile, warn_dollars) = 1;
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CPP_OPTION (pfile, warn_variadic_macros) = 1;
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CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
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CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
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/* By default, track locations of tokens resulting from macro
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expansion. The '2' means, track the locations with the highest
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accuracy. Read the comments for struct
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cpp_options::track_macro_expansion to learn about the other
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values. */
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CPP_OPTION (pfile, track_macro_expansion) = 2;
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CPP_OPTION (pfile, warn_normalize) = normalized_C;
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CPP_OPTION (pfile, warn_literal_suffix) = 1;
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CPP_OPTION (pfile, canonical_system_headers)
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= ENABLE_CANONICAL_SYSTEM_HEADERS;
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CPP_OPTION (pfile, ext_numeric_literals) = 1;
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CPP_OPTION (pfile, warn_date_time) = 0;
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/* Default CPP arithmetic to something sensible for the host for the
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benefit of dumb users like fix-header. */
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CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
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CPP_OPTION (pfile, char_precision) = CHAR_BIT;
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CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
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CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
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CPP_OPTION (pfile, unsigned_char) = 0;
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CPP_OPTION (pfile, unsigned_wchar) = 1;
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CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
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/* Default to no charset conversion. */
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CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
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CPP_OPTION (pfile, wide_charset) = 0;
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/* Default the input character set to UTF-8. */
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CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
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/* A fake empty "directory" used as the starting point for files
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looked up without a search path. Name cannot be '/' because we
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don't want to prepend anything at all to filenames using it. All
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other entries are correct zero-initialized. */
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pfile->no_search_path.name = (char *) "";
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/* Initialize the line map. */
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pfile->line_table = line_table;
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/* Initialize lexer state. */
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pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
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/* Set up static tokens. */
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pfile->avoid_paste.type = CPP_PADDING;
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pfile->avoid_paste.val.source = NULL;
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pfile->avoid_paste.src_loc = 0;
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pfile->endarg.type = CPP_EOF;
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pfile->endarg.flags = 0;
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pfile->endarg.src_loc = 0;
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/* Create a token buffer for the lexer. */
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_cpp_init_tokenrun (&pfile->base_run, 250);
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pfile->cur_run = &pfile->base_run;
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pfile->cur_token = pfile->base_run.base;
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/* Initialize the base context. */
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pfile->context = &pfile->base_context;
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pfile->base_context.c.macro = 0;
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pfile->base_context.prev = pfile->base_context.next = 0;
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/* Aligned and unaligned storage. */
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pfile->a_buff = _cpp_get_buff (pfile, 0);
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pfile->u_buff = _cpp_get_buff (pfile, 0);
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/* Initialize table for push_macro/pop_macro. */
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pfile->pushed_macros = 0;
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/* Do not force token locations by default. */
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pfile->forced_token_location = 0;
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/* Note the timestamp is unset. */
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pfile->time_stamp = time_t (-1);
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pfile->time_stamp_kind = 0;
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/* The expression parser stack. */
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_cpp_expand_op_stack (pfile);
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/* Initialize the buffer obstack. */
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obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
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_cpp_init_files (pfile);
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_cpp_init_hashtable (pfile, table);
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return pfile;
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}
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/* Set the line_table entry in PFILE. This is called after reading a
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PCH file, as the old line_table will be incorrect. */
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void
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cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table)
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{
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pfile->line_table = line_table;
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}
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/* Free resources used by PFILE. Accessing PFILE after this function
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returns leads to undefined behavior. Returns the error count. */
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void
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cpp_destroy (cpp_reader *pfile)
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{
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cpp_context *context, *contextn;
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struct def_pragma_macro *pmacro;
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tokenrun *run, *runn;
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int i;
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free (pfile->op_stack);
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while (CPP_BUFFER (pfile) != NULL)
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_cpp_pop_buffer (pfile);
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free (pfile->out.base);
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if (pfile->macro_buffer)
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{
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free (pfile->macro_buffer);
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pfile->macro_buffer = NULL;
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pfile->macro_buffer_len = 0;
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}
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if (pfile->deps)
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deps_free (pfile->deps);
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obstack_free (&pfile->buffer_ob, 0);
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_cpp_destroy_hashtable (pfile);
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_cpp_cleanup_files (pfile);
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_cpp_destroy_iconv (pfile);
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_cpp_free_buff (pfile->a_buff);
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_cpp_free_buff (pfile->u_buff);
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_cpp_free_buff (pfile->free_buffs);
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for (run = &pfile->base_run; run; run = runn)
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{
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runn = run->next;
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free (run->base);
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if (run != &pfile->base_run)
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free (run);
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}
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for (context = pfile->base_context.next; context; context = contextn)
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{
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contextn = context->next;
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free (context);
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}
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if (pfile->comments.entries)
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{
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for (i = 0; i < pfile->comments.count; i++)
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free (pfile->comments.entries[i].comment);
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free (pfile->comments.entries);
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}
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if (pfile->pushed_macros)
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{
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do
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{
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pmacro = pfile->pushed_macros;
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pfile->pushed_macros = pmacro->next;
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free (pmacro->name);
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free (pmacro);
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}
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while (pfile->pushed_macros);
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}
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free (pfile);
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}
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/* This structure defines one built-in identifier. A node will be
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entered in the hash table under the name NAME, with value VALUE.
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There are two tables of these. builtin_array holds all the
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"builtin" macros: these are handled by builtin_macro() in
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macro.c. Builtin is somewhat of a misnomer -- the property of
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interest is that these macros require special code to compute their
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expansions. The value is a "cpp_builtin_type" enumerator.
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operator_array holds the C++ named operators. These are keywords
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which act as aliases for punctuators. In C++, they cannot be
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altered through #define, and #if recognizes them as operators. In
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C, these are not entered into the hash table at all (but see
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<iso646.h>). The value is a token-type enumerator. */
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struct builtin_macro
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{
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const uchar *const name;
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const unsigned short len;
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const unsigned short value;
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const bool always_warn_if_redefined;
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};
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#define B(n, t, f) { DSC(n), t, f }
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static const struct builtin_macro builtin_array[] =
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{
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B("__TIMESTAMP__", BT_TIMESTAMP, false),
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B("__TIME__", BT_TIME, false),
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B("__DATE__", BT_DATE, false),
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B("__FILE__", BT_FILE, false),
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B("__BASE_FILE__", BT_BASE_FILE, false),
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B("__LINE__", BT_SPECLINE, true),
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B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
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B("__COUNTER__", BT_COUNTER, true),
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/* Make sure to update the list of built-in
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function-like macros in traditional.c:
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fun_like_macro() when adding more following */
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B("__has_attribute", BT_HAS_ATTRIBUTE, true),
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B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE, true),
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B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
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B("__has_builtin", BT_HAS_BUILTIN, true),
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B("__has_include", BT_HAS_INCLUDE, true),
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B("__has_include_next",BT_HAS_INCLUDE_NEXT, true),
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/* Keep builtins not used for -traditional-cpp at the end, and
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update init_builtins() if any more are added. */
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B("_Pragma", BT_PRAGMA, true),
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B("__STDC__", BT_STDC, true),
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};
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#undef B
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struct builtin_operator
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{
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const uchar *const name;
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const unsigned short len;
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const unsigned short value;
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};
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#define B(n, t) { DSC(n), t }
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static const struct builtin_operator operator_array[] =
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{
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B("and", CPP_AND_AND),
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B("and_eq", CPP_AND_EQ),
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B("bitand", CPP_AND),
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B("bitor", CPP_OR),
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B("compl", CPP_COMPL),
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B("not", CPP_NOT),
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B("not_eq", CPP_NOT_EQ),
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B("or", CPP_OR_OR),
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B("or_eq", CPP_OR_EQ),
|
|
B("xor", CPP_XOR),
|
|
B("xor_eq", CPP_XOR_EQ)
|
|
};
|
|
#undef B
|
|
|
|
/* Mark the C++ named operators in the hash table. */
|
|
static void
|
|
mark_named_operators (cpp_reader *pfile, int flags)
|
|
{
|
|
const struct builtin_operator *b;
|
|
|
|
for (b = operator_array;
|
|
b < (operator_array + ARRAY_SIZE (operator_array));
|
|
b++)
|
|
{
|
|
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
|
|
hp->flags |= flags;
|
|
hp->is_directive = 0;
|
|
hp->directive_index = b->value;
|
|
}
|
|
}
|
|
|
|
/* Helper function of cpp_type2name. Return the string associated with
|
|
named operator TYPE. */
|
|
const char *
|
|
cpp_named_operator2name (enum cpp_ttype type)
|
|
{
|
|
const struct builtin_operator *b;
|
|
|
|
for (b = operator_array;
|
|
b < (operator_array + ARRAY_SIZE (operator_array));
|
|
b++)
|
|
{
|
|
if (type == b->value)
|
|
return (const char *) b->name;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
cpp_init_special_builtins (cpp_reader *pfile)
|
|
{
|
|
const struct builtin_macro *b;
|
|
size_t n = ARRAY_SIZE (builtin_array);
|
|
|
|
if (CPP_OPTION (pfile, traditional))
|
|
n -= 2;
|
|
else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
|
|
|| CPP_OPTION (pfile, std))
|
|
n--;
|
|
|
|
for (b = builtin_array; b < builtin_array + n; b++)
|
|
{
|
|
if ((b->value == BT_HAS_ATTRIBUTE
|
|
|| b->value == BT_HAS_STD_ATTRIBUTE
|
|
|| b->value == BT_HAS_BUILTIN)
|
|
&& (CPP_OPTION (pfile, lang) == CLK_ASM
|
|
|| pfile->cb.has_attribute == NULL))
|
|
continue;
|
|
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
|
|
hp->type = NT_BUILTIN_MACRO;
|
|
if (b->always_warn_if_redefined)
|
|
hp->flags |= NODE_WARN;
|
|
hp->value.builtin = (enum cpp_builtin_type) b->value;
|
|
}
|
|
}
|
|
|
|
/* Restore macro C to builtin macro definition. */
|
|
|
|
void
|
|
_cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
|
|
{
|
|
size_t len = strlen (c->name);
|
|
|
|
for (const struct builtin_macro *b = builtin_array;
|
|
b < builtin_array + ARRAY_SIZE (builtin_array); b++)
|
|
if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
|
|
{
|
|
cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
|
|
hp->type = NT_BUILTIN_MACRO;
|
|
if (b->always_warn_if_redefined)
|
|
hp->flags |= NODE_WARN;
|
|
hp->value.builtin = (enum cpp_builtin_type) b->value;
|
|
}
|
|
}
|
|
|
|
/* Read the builtins table above and enter them, and language-specific
|
|
macros, into the hash table. HOSTED is true if this is a hosted
|
|
environment. */
|
|
void
|
|
cpp_init_builtins (cpp_reader *pfile, int hosted)
|
|
{
|
|
cpp_init_special_builtins (pfile);
|
|
|
|
if (!CPP_OPTION (pfile, traditional)
|
|
&& (! CPP_OPTION (pfile, stdc_0_in_system_headers)
|
|
|| CPP_OPTION (pfile, std)))
|
|
_cpp_define_builtin (pfile, "__STDC__ 1");
|
|
|
|
if (CPP_OPTION (pfile, cplusplus))
|
|
{
|
|
if (CPP_OPTION (pfile, lang) == CLK_CXX20
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX20)
|
|
_cpp_define_builtin (pfile, "__cplusplus 202002L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_CXX17
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
|
|
_cpp_define_builtin (pfile, "__cplusplus 201703L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_CXX14
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
|
|
_cpp_define_builtin (pfile, "__cplusplus 201402L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_CXX11
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
|
|
_cpp_define_builtin (pfile, "__cplusplus 201103L");
|
|
else
|
|
_cpp_define_builtin (pfile, "__cplusplus 199711L");
|
|
}
|
|
else if (CPP_OPTION (pfile, lang) == CLK_ASM)
|
|
_cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
|
|
_cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_STDC2X
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUC2X)
|
|
_cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_STDC17
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUC17)
|
|
_cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
|
|
else if (CPP_OPTION (pfile, lang) == CLK_STDC11
|
|
|| CPP_OPTION (pfile, lang) == CLK_GNUC11)
|
|
_cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
|
|
else if (CPP_OPTION (pfile, c99))
|
|
_cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
|
|
|
|
if (CPP_OPTION (pfile, uliterals)
|
|
&& !(CPP_OPTION (pfile, cplusplus)
|
|
&& (CPP_OPTION (pfile, lang) == CLK_GNUCXX
|
|
|| CPP_OPTION (pfile, lang) == CLK_CXX98)))
|
|
{
|
|
_cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
|
|
_cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
|
|
}
|
|
|
|
if (hosted)
|
|
_cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
|
|
else
|
|
_cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
|
|
|
|
if (CPP_OPTION (pfile, objc))
|
|
_cpp_define_builtin (pfile, "__OBJC__ 1");
|
|
}
|
|
|
|
/* Sanity-checks are dependent on command-line options, so it is
|
|
called as a subroutine of cpp_read_main_file. */
|
|
#if CHECKING_P
|
|
static void sanity_checks (cpp_reader *);
|
|
static void sanity_checks (cpp_reader *pfile)
|
|
{
|
|
cppchar_t test = 0;
|
|
size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
|
|
|
|
/* Sanity checks for assumptions about CPP arithmetic and target
|
|
type precisions made by cpplib. */
|
|
test--;
|
|
if (test < 1)
|
|
cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
|
|
|
|
if (CPP_OPTION (pfile, precision) > max_precision)
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"preprocessor arithmetic has maximum precision of %lu bits;"
|
|
" target requires %lu bits",
|
|
(unsigned long) max_precision,
|
|
(unsigned long) CPP_OPTION (pfile, precision));
|
|
|
|
if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"CPP arithmetic must be at least as precise as a target int");
|
|
|
|
if (CPP_OPTION (pfile, char_precision) < 8)
|
|
cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
|
|
|
|
if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"target wchar_t is narrower than target char");
|
|
|
|
if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"target int is narrower than target char");
|
|
|
|
/* This is assumed in eval_token() and could be fixed if necessary. */
|
|
if (sizeof (cppchar_t) > sizeof (cpp_num_part))
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"CPP half-integer narrower than CPP character");
|
|
|
|
if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
|
|
cpp_error (pfile, CPP_DL_ICE,
|
|
"CPP on this host cannot handle wide character constants over"
|
|
" %lu bits, but the target requires %lu bits",
|
|
(unsigned long) BITS_PER_CPPCHAR_T,
|
|
(unsigned long) CPP_OPTION (pfile, wchar_precision));
|
|
}
|
|
#else
|
|
# define sanity_checks(PFILE)
|
|
#endif
|
|
|
|
/* This is called after options have been parsed, and partially
|
|
processed. */
|
|
void
|
|
cpp_post_options (cpp_reader *pfile)
|
|
{
|
|
int flags;
|
|
|
|
sanity_checks (pfile);
|
|
|
|
post_options (pfile);
|
|
|
|
/* Mark named operators before handling command line macros. */
|
|
flags = 0;
|
|
if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
|
|
flags |= NODE_OPERATOR;
|
|
if (CPP_OPTION (pfile, warn_cxx_operator_names))
|
|
flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
|
|
if (flags != 0)
|
|
mark_named_operators (pfile, flags);
|
|
}
|
|
|
|
/* Setup for processing input from the file named FNAME, or stdin if
|
|
it is the empty string. Return the original filename on success
|
|
(e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if
|
|
there may be injected headers before line 1 of the main file. */
|
|
const char *
|
|
cpp_read_main_file (cpp_reader *pfile, const char *fname, bool injecting)
|
|
{
|
|
if (mkdeps *deps = cpp_get_deps (pfile))
|
|
/* Set the default target (if there is none already). */
|
|
deps_add_default_target (deps, fname);
|
|
|
|
pfile->main_file
|
|
= _cpp_find_file (pfile, fname,
|
|
CPP_OPTION (pfile, preprocessed) ? &pfile->no_search_path
|
|
: CPP_OPTION (pfile, main_search) == CMS_user
|
|
? pfile->quote_include
|
|
: CPP_OPTION (pfile, main_search) == CMS_system
|
|
? pfile->bracket_include : &pfile->no_search_path,
|
|
/*angle=*/0, _cpp_FFK_NORMAL, 0);
|
|
|
|
if (_cpp_find_failed (pfile->main_file))
|
|
return NULL;
|
|
|
|
_cpp_stack_file (pfile, pfile->main_file,
|
|
injecting || CPP_OPTION (pfile, preprocessed)
|
|
? IT_PRE_MAIN : IT_MAIN, 0);
|
|
|
|
/* For foo.i, read the original filename foo.c now, for the benefit
|
|
of the front ends. */
|
|
if (CPP_OPTION (pfile, preprocessed))
|
|
if (!read_original_filename (pfile))
|
|
{
|
|
/* We're on line 1 after all. */
|
|
auto *last = linemap_check_ordinary
|
|
(LINEMAPS_LAST_MAP (pfile->line_table, false));
|
|
last->to_line = 1;
|
|
/* Inform of as-if a file change. */
|
|
_cpp_do_file_change (pfile, LC_RENAME_VERBATIM, LINEMAP_FILE (last),
|
|
LINEMAP_LINE (last), LINEMAP_SYSP (last));
|
|
}
|
|
|
|
auto *map = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table);
|
|
pfile->main_loc = MAP_START_LOCATION (map);
|
|
|
|
return ORDINARY_MAP_FILE_NAME (map);
|
|
}
|
|
|
|
location_t
|
|
cpp_main_loc (const cpp_reader *pfile)
|
|
{
|
|
return pfile->main_loc;
|
|
}
|
|
|
|
/* For preprocessed files, if the very first characters are
|
|
'#<SPACE>[01]<SPACE>', then handle a line directive so we know the
|
|
original file name. This will generate file_change callbacks,
|
|
which the front ends must handle appropriately given their state of
|
|
initialization. We peek directly into the character buffer, so
|
|
that we're not confused by otherwise-skipped white space &
|
|
comments. We can be very picky, because this should have been
|
|
machine-generated text (by us, no less). This way we do not
|
|
interfere with the module directive state machine. */
|
|
|
|
static bool
|
|
read_original_filename (cpp_reader *pfile)
|
|
{
|
|
auto *buf = pfile->buffer->next_line;
|
|
|
|
if (pfile->buffer->rlimit - buf > 4
|
|
&& buf[0] == '#'
|
|
&& buf[1] == ' '
|
|
// Also permit '1', as that's what used to be here
|
|
&& (buf[2] == '0' || buf[2] == '1')
|
|
&& buf[3] == ' ')
|
|
{
|
|
const cpp_token *token = _cpp_lex_direct (pfile);
|
|
gcc_checking_assert (token->type == CPP_HASH);
|
|
if (_cpp_handle_directive (pfile, token->flags & PREV_WHITE))
|
|
{
|
|
read_original_directory (pfile);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* For preprocessed files, if the tokens following the first filename
|
|
line is of the form # <line> "/path/name//", handle the
|
|
directive so we know the original current directory.
|
|
|
|
As with the first line peeking, we can do this without lexing by
|
|
being picky. */
|
|
static void
|
|
read_original_directory (cpp_reader *pfile)
|
|
{
|
|
auto *buf = pfile->buffer->next_line;
|
|
|
|
if (pfile->buffer->rlimit - buf > 4
|
|
&& buf[0] == '#'
|
|
&& buf[1] == ' '
|
|
// Also permit '1', as that's what used to be here
|
|
&& (buf[2] == '0' || buf[2] == '1')
|
|
&& buf[3] == ' ')
|
|
{
|
|
const cpp_token *hash = _cpp_lex_direct (pfile);
|
|
gcc_checking_assert (hash->type == CPP_HASH);
|
|
pfile->state.in_directive = 1;
|
|
const cpp_token *number = _cpp_lex_direct (pfile);
|
|
gcc_checking_assert (number->type == CPP_NUMBER);
|
|
const cpp_token *string = _cpp_lex_direct (pfile);
|
|
pfile->state.in_directive = 0;
|
|
|
|
const unsigned char *text = nullptr;
|
|
size_t len = 0;
|
|
if (string->type == CPP_STRING)
|
|
{
|
|
/* The string value includes the quotes. */
|
|
text = string->val.str.text;
|
|
len = string->val.str.len;
|
|
}
|
|
if (len < 5
|
|
|| !IS_DIR_SEPARATOR (text[len - 2])
|
|
|| !IS_DIR_SEPARATOR (text[len - 3]))
|
|
{
|
|
/* That didn't work out, back out. */
|
|
_cpp_backup_tokens (pfile, 3);
|
|
return;
|
|
}
|
|
|
|
if (pfile->cb.dir_change)
|
|
{
|
|
/* Smash the string directly, it's dead at this point */
|
|
char *smashy = (char *)text;
|
|
smashy[len - 3] = 0;
|
|
|
|
pfile->cb.dir_change (pfile, smashy + 1);
|
|
}
|
|
|
|
/* We should be at EOL. */
|
|
}
|
|
}
|
|
|
|
/* This is called at the end of preprocessing. It pops the last
|
|
buffer and writes dependency output.
|
|
|
|
Maybe it should also reset state, such that you could call
|
|
cpp_start_read with a new filename to restart processing. */
|
|
void
|
|
cpp_finish (cpp_reader *pfile, FILE *deps_stream)
|
|
{
|
|
/* Warn about unused macros before popping the final buffer. */
|
|
if (CPP_OPTION (pfile, warn_unused_macros))
|
|
cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
|
|
|
|
/* lex.c leaves the final buffer on the stack. This it so that
|
|
it returns an unending stream of CPP_EOFs to the client. If we
|
|
popped the buffer, we'd dereference a NULL buffer pointer and
|
|
segfault. It's nice to allow the client to do worry-free excess
|
|
cpp_get_token calls. */
|
|
while (pfile->buffer)
|
|
_cpp_pop_buffer (pfile);
|
|
|
|
if (deps_stream)
|
|
deps_write (pfile, deps_stream, 72);
|
|
|
|
/* Report on headers that could use multiple include guards. */
|
|
if (CPP_OPTION (pfile, print_include_names))
|
|
_cpp_report_missing_guards (pfile);
|
|
}
|
|
|
|
static void
|
|
post_options (cpp_reader *pfile)
|
|
{
|
|
/* -Wtraditional is not useful in C++ mode. */
|
|
if (CPP_OPTION (pfile, cplusplus))
|
|
CPP_OPTION (pfile, cpp_warn_traditional) = 0;
|
|
|
|
/* Permanently disable macro expansion if we are rescanning
|
|
preprocessed text. Read preprocesed source in ISO mode. */
|
|
if (CPP_OPTION (pfile, preprocessed))
|
|
{
|
|
if (!CPP_OPTION (pfile, directives_only))
|
|
pfile->state.prevent_expansion = 1;
|
|
CPP_OPTION (pfile, traditional) = 0;
|
|
}
|
|
|
|
if (CPP_OPTION (pfile, warn_trigraphs) == 2)
|
|
CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
|
|
|
|
if (CPP_OPTION (pfile, traditional))
|
|
{
|
|
CPP_OPTION (pfile, trigraphs) = 0;
|
|
CPP_OPTION (pfile, warn_trigraphs) = 0;
|
|
}
|
|
|
|
if (CPP_OPTION (pfile, module_directives))
|
|
{
|
|
/* These unspellable tokens have a leading space. */
|
|
const char *const inits[spec_nodes::M_HWM]
|
|
= {"export ", "module ", "import ", "__import"};
|
|
|
|
for (int ix = 0; ix != spec_nodes::M_HWM; ix++)
|
|
{
|
|
cpp_hashnode *node = cpp_lookup (pfile, UC (inits[ix]),
|
|
strlen (inits[ix]));
|
|
|
|
/* Token we pass to the compiler. */
|
|
pfile->spec_nodes.n_modules[ix][1] = node;
|
|
|
|
if (ix != spec_nodes::M__IMPORT)
|
|
/* Token we recognize when lexing, drop the trailing ' '. */
|
|
node = cpp_lookup (pfile, NODE_NAME (node), NODE_LEN (node) - 1);
|
|
|
|
node->flags |= NODE_MODULE;
|
|
pfile->spec_nodes.n_modules[ix][0] = node;
|
|
}
|
|
}
|
|
}
|