b1822ccc44
* c-common.c, c-common.h (dollars_in_ident): Remove. * c-opts.c (DOLLARS_IN_IDENTIFIERS): Default to true. (c_common_init_options, c_common_decode_option): Set dollars_in_ident. * cpphash.h (warned_dollar): Rename warn_dollars. * cppinit.c (struct lang_flags, lang_defaults, cpp_set_lang) Permit dollars regardless of -std=. (post_options): Set warn_dollars. * cpplex.c (forms_identifier_p): Use warn_dollars. * config/darwin.h, config/alpha/vms.h, config/m68hc11/m68hc11.h: Remove redundant definitions of DOLLARS_IN_IDENTIFIERS. * doc/cpp.texi, doc/cppopts.texi, doc/invoke.texi, doc/tm.texi: Update documentation. testsuite: * gcc.dg/dollar.c: New test. From-SVN: r66911
1843 lines
47 KiB
C
1843 lines
47 KiB
C
/* CPP Library - lexical analysis.
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Copyright (C) 2000, 2001, 2002 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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Broken out to separate file, Zack Weinberg, Mar 2000
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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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 "tm.h"
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#include "cpplib.h"
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#include "cpphash.h"
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enum spell_type
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{
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SPELL_OPERATOR = 0,
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SPELL_IDENT,
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SPELL_LITERAL,
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SPELL_NONE
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};
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struct token_spelling
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{
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enum spell_type category;
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const unsigned char *name;
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};
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static const unsigned char *const digraph_spellings[] =
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{ U"%:", U"%:%:", U"<:", U":>", U"<%", U"%>" };
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#define OP(e, s) { SPELL_OPERATOR, U s },
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#define TK(e, s) { s, U STRINGX (e) },
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static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE };
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#undef OP
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#undef TK
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#define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
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#define TOKEN_NAME(token) (token_spellings[(token)->type].name)
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static void add_line_note PARAMS ((cpp_buffer *, const uchar *, unsigned int));
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static int skip_line_comment PARAMS ((cpp_reader *));
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static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
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static cpp_hashnode *lex_identifier PARAMS ((cpp_reader *, const uchar *));
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static void lex_number PARAMS ((cpp_reader *, cpp_string *));
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static bool forms_identifier_p PARAMS ((cpp_reader *, int));
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static void lex_string PARAMS ((cpp_reader *, cpp_token *, const uchar *));
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static void save_comment PARAMS ((cpp_reader *, cpp_token *, const uchar *,
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cppchar_t));
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static void create_literal PARAMS ((cpp_reader *, cpp_token *, const uchar *,
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unsigned int, enum cpp_ttype));
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static bool warn_in_comment PARAMS ((cpp_reader *, _cpp_line_note *));
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static int name_p PARAMS ((cpp_reader *, const cpp_string *));
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static cppchar_t maybe_read_ucn PARAMS ((cpp_reader *, const uchar **));
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static tokenrun *next_tokenrun PARAMS ((tokenrun *));
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static unsigned int hex_digit_value PARAMS ((unsigned int));
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static _cpp_buff *new_buff PARAMS ((size_t));
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/* Utility routine:
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Compares, the token TOKEN to the NUL-terminated string STRING.
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TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */
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int
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cpp_ideq (token, string)
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const cpp_token *token;
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const char *string;
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{
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if (token->type != CPP_NAME)
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return 0;
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return !ustrcmp (NODE_NAME (token->val.node), (const uchar *) string);
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}
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/* Record a note TYPE at byte POS into the current cleaned logical
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line. */
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static void
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add_line_note (buffer, pos, type)
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cpp_buffer *buffer;
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const uchar *pos;
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unsigned int type;
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{
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if (buffer->notes_used == buffer->notes_cap)
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{
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buffer->notes_cap = buffer->notes_cap * 2 + 200;
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buffer->notes = (_cpp_line_note *)
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xrealloc (buffer->notes, buffer->notes_cap * sizeof (_cpp_line_note));
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}
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buffer->notes[buffer->notes_used].pos = pos;
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buffer->notes[buffer->notes_used].type = type;
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buffer->notes_used++;
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}
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/* Returns with a logical line that contains no escaped newlines or
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trigraphs. This is a time-critical inner loop. */
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void
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_cpp_clean_line (pfile)
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cpp_reader *pfile;
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{
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cpp_buffer *buffer;
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const uchar *s;
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uchar c, *d, *p;
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buffer = pfile->buffer;
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buffer->cur_note = buffer->notes_used = 0;
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buffer->cur = buffer->line_base = buffer->next_line;
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buffer->need_line = false;
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s = buffer->next_line - 1;
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if (!buffer->from_stage3)
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{
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d = (uchar *) s;
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for (;;)
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{
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c = *++s;
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*++d = c;
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if (c == '\n' || c == '\r')
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{
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/* Handle DOS line endings. */
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if (c == '\r' && s != buffer->rlimit && s[1] == '\n')
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s++;
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if (s == buffer->rlimit)
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break;
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/* Escaped? */
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p = d;
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while (p != buffer->next_line && is_nvspace (p[-1]))
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p--;
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if (p == buffer->next_line || p[-1] != '\\')
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break;
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add_line_note (buffer, p - 1, p != d ? ' ': '\\');
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d = p - 2;
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buffer->next_line = p - 1;
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}
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else if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]])
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{
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/* Add a note regardless, for the benefit of -Wtrigraphs. */
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add_line_note (buffer, d, s[2]);
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if (CPP_OPTION (pfile, trigraphs))
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{
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*d = _cpp_trigraph_map[s[2]];
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s += 2;
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}
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}
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}
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}
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else
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{
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do
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s++;
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while (*s != '\n' && *s != '\r');
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d = (uchar *) s;
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/* Handle DOS line endings. */
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if (*s == '\r' && s != buffer->rlimit && s[1] == '\n')
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s++;
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}
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*d = '\n';
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/* A sentinel note that should never be processed. */
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add_line_note (buffer, d + 1, '\n');
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buffer->next_line = s + 1;
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}
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/* Return true if the trigraph indicated by NOTE should be warned
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about in a comment. */
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static bool
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warn_in_comment (pfile, note)
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cpp_reader *pfile;
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_cpp_line_note *note;
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{
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const uchar *p;
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/* Within comments we don't warn about trigraphs, unless the
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trigraph forms an escaped newline, as that may change
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behaviour. */
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if (note->type != '/')
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return false;
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/* If -trigraphs, then this was an escaped newline iff the next note
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is coincident. */
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if (CPP_OPTION (pfile, trigraphs))
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return note[1].pos == note->pos;
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/* Otherwise, see if this forms an escaped newline. */
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p = note->pos + 3;
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while (is_nvspace (*p))
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p++;
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/* There might have been escaped newlines between the trigraph and the
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newline we found. Hence the position test. */
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return (*p == '\n' && p < note[1].pos);
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}
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/* Process the notes created by add_line_note as far as the current
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location. */
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void
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_cpp_process_line_notes (pfile, in_comment)
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cpp_reader *pfile;
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int in_comment;
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{
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cpp_buffer *buffer = pfile->buffer;
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for (;;)
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{
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_cpp_line_note *note = &buffer->notes[buffer->cur_note];
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unsigned int col;
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if (note->pos > buffer->cur)
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break;
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buffer->cur_note++;
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col = CPP_BUF_COLUMN (buffer, note->pos + 1);
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if (note->type == '\\' || note->type == ' ')
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{
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if (note->type == ' ' && !in_comment)
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cpp_error_with_line (pfile, DL_WARNING, pfile->line, col,
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"backslash and newline separated by space");
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if (buffer->next_line > buffer->rlimit)
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{
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cpp_error_with_line (pfile, DL_PEDWARN, pfile->line, col,
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"backslash-newline at end of file");
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/* Prevent "no newline at end of file" warning. */
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buffer->next_line = buffer->rlimit;
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}
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buffer->line_base = note->pos;
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pfile->line++;
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}
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else if (_cpp_trigraph_map[note->type])
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{
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if (CPP_OPTION (pfile, warn_trigraphs)
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&& (!in_comment || warn_in_comment (pfile, note)))
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{
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if (CPP_OPTION (pfile, trigraphs))
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cpp_error_with_line (pfile, DL_WARNING, pfile->line, col,
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"trigraph ??%c converted to %c",
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note->type,
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(int) _cpp_trigraph_map[note->type]);
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else
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cpp_error_with_line (pfile, DL_WARNING, pfile->line, col,
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"trigraph ??%c ignored",
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note->type);
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}
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}
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else
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abort ();
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}
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}
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/* Skip a C-style block comment. We find the end of the comment by
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seeing if an asterisk is before every '/' we encounter. Returns
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nonzero if comment terminated by EOF, zero otherwise.
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Buffer->cur points to the initial asterisk of the comment. */
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bool
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_cpp_skip_block_comment (pfile)
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cpp_reader *pfile;
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{
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cpp_buffer *buffer = pfile->buffer;
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cppchar_t c;
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buffer->cur++;
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if (*buffer->cur == '/')
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buffer->cur++;
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for (;;)
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{
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c = *buffer->cur++;
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/* People like decorating comments with '*', so check for '/'
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instead for efficiency. */
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if (c == '/')
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{
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if (buffer->cur[-2] == '*')
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break;
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/* Warn about potential nested comments, but not if the '/'
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comes immediately before the true comment delimiter.
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Don't bother to get it right across escaped newlines. */
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if (CPP_OPTION (pfile, warn_comments)
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&& buffer->cur[0] == '*' && buffer->cur[1] != '/')
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cpp_error_with_line (pfile, DL_WARNING,
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pfile->line, CPP_BUF_COL (buffer),
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"\"/*\" within comment");
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}
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else if (c == '\n')
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{
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buffer->cur--;
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_cpp_process_line_notes (pfile, true);
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if (buffer->next_line >= buffer->rlimit)
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return true;
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_cpp_clean_line (pfile);
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pfile->line++;
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}
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}
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_cpp_process_line_notes (pfile, true);
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return false;
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}
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/* Skip a C++ line comment, leaving buffer->cur pointing to the
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terminating newline. Handles escaped newlines. Returns nonzero
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if a multiline comment. */
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static int
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skip_line_comment (pfile)
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cpp_reader *pfile;
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{
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cpp_buffer *buffer = pfile->buffer;
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unsigned int orig_line = pfile->line;
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|
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while (*buffer->cur != '\n')
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buffer->cur++;
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_cpp_process_line_notes (pfile, true);
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return orig_line != pfile->line;
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}
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|
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/* Skips whitespace, saving the next non-whitespace character. */
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static void
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skip_whitespace (pfile, c)
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cpp_reader *pfile;
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cppchar_t c;
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{
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cpp_buffer *buffer = pfile->buffer;
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bool saw_NUL = false;
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do
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{
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/* Horizontal space always OK. */
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if (c == ' ' || c == '\t')
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;
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/* Just \f \v or \0 left. */
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else if (c == '\0')
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saw_NUL = true;
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else if (pfile->state.in_directive && CPP_PEDANTIC (pfile))
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cpp_error_with_line (pfile, DL_PEDWARN, pfile->line,
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CPP_BUF_COL (buffer),
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"%s in preprocessing directive",
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c == '\f' ? "form feed" : "vertical tab");
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c = *buffer->cur++;
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}
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/* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
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while (is_nvspace (c));
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|
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if (saw_NUL)
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cpp_error (pfile, DL_WARNING, "null character(s) ignored");
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buffer->cur--;
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}
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|
/* See if the characters of a number token are valid in a name (no
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'.', '+' or '-'). */
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static int
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name_p (pfile, string)
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cpp_reader *pfile;
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const cpp_string *string;
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|
{
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unsigned int i;
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|
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for (i = 0; i < string->len; i++)
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if (!is_idchar (string->text[i]))
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return 0;
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return 1;
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}
|
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|
|
/* Returns TRUE if the sequence starting at buffer->cur is invalid in
|
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an identifier. FIRST is TRUE if this starts an identifier. */
|
|
static bool
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forms_identifier_p (pfile, first)
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cpp_reader *pfile;
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int first;
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{
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cpp_buffer *buffer = pfile->buffer;
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|
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if (*buffer->cur == '$')
|
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{
|
|
if (!CPP_OPTION (pfile, dollars_in_ident))
|
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return false;
|
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|
|
buffer->cur++;
|
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if (pfile->warn_dollars && !pfile->state.skipping)
|
|
{
|
|
pfile->warn_dollars = false;
|
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cpp_error (pfile, DL_PEDWARN, "'$' in identifier or number");
|
|
}
|
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|
|
return true;
|
|
}
|
|
|
|
/* Is this a syntactically valid UCN? */
|
|
if (0 && *buffer->cur == '\\'
|
|
&& (buffer->cur[1] == 'u' || buffer->cur[1] == 'U'))
|
|
{
|
|
buffer->cur += 2;
|
|
if (_cpp_valid_ucn (pfile, &buffer->cur, 1 + !first))
|
|
return true;
|
|
buffer->cur -= 2;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Lex an identifier starting at BUFFER->CUR - 1. */
|
|
static cpp_hashnode *
|
|
lex_identifier (pfile, base)
|
|
cpp_reader *pfile;
|
|
const uchar *base;
|
|
{
|
|
cpp_hashnode *result;
|
|
const uchar *cur;
|
|
|
|
do
|
|
{
|
|
cur = pfile->buffer->cur;
|
|
|
|
/* N.B. ISIDNUM does not include $. */
|
|
while (ISIDNUM (*cur))
|
|
cur++;
|
|
|
|
pfile->buffer->cur = cur;
|
|
}
|
|
while (forms_identifier_p (pfile, false));
|
|
|
|
result = (cpp_hashnode *)
|
|
ht_lookup (pfile->hash_table, base, cur - base, HT_ALLOC);
|
|
|
|
/* Rarely, identifiers require diagnostics when lexed. */
|
|
if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC)
|
|
&& !pfile->state.skipping, 0))
|
|
{
|
|
/* It is allowed to poison the same identifier twice. */
|
|
if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok)
|
|
cpp_error (pfile, DL_ERROR, "attempt to use poisoned \"%s\"",
|
|
NODE_NAME (result));
|
|
|
|
/* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the
|
|
replacement list of a variadic macro. */
|
|
if (result == pfile->spec_nodes.n__VA_ARGS__
|
|
&& !pfile->state.va_args_ok)
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"__VA_ARGS__ can only appear in the expansion of a C99 variadic macro");
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Lex a number to NUMBER starting at BUFFER->CUR - 1. */
|
|
static void
|
|
lex_number (pfile, number)
|
|
cpp_reader *pfile;
|
|
cpp_string *number;
|
|
{
|
|
const uchar *cur;
|
|
const uchar *base;
|
|
uchar *dest;
|
|
|
|
base = pfile->buffer->cur - 1;
|
|
do
|
|
{
|
|
cur = pfile->buffer->cur;
|
|
|
|
/* N.B. ISIDNUM does not include $. */
|
|
while (ISIDNUM (*cur) || *cur == '.' || VALID_SIGN (*cur, cur[-1]))
|
|
cur++;
|
|
|
|
pfile->buffer->cur = cur;
|
|
}
|
|
while (forms_identifier_p (pfile, false));
|
|
|
|
number->len = cur - base;
|
|
dest = _cpp_unaligned_alloc (pfile, number->len + 1);
|
|
memcpy (dest, base, number->len);
|
|
dest[number->len] = '\0';
|
|
number->text = dest;
|
|
}
|
|
|
|
/* Create a token of type TYPE with a literal spelling. */
|
|
static void
|
|
create_literal (pfile, token, base, len, type)
|
|
cpp_reader *pfile;
|
|
cpp_token *token;
|
|
const uchar *base;
|
|
unsigned int len;
|
|
enum cpp_ttype type;
|
|
{
|
|
uchar *dest = _cpp_unaligned_alloc (pfile, len + 1);
|
|
|
|
memcpy (dest, base, len);
|
|
dest[len] = '\0';
|
|
token->type = type;
|
|
token->val.str.len = len;
|
|
token->val.str.text = dest;
|
|
}
|
|
|
|
/* Lexes a string, character constant, or angle-bracketed header file
|
|
name. The stored string contains the spelling, including opening
|
|
quote and leading any leading 'L'. It returns the type of the
|
|
literal, or CPP_OTHER if it was not properly terminated.
|
|
|
|
The spelling is NUL-terminated, but it is not guaranteed that this
|
|
is the first NUL since embedded NULs are preserved. */
|
|
static void
|
|
lex_string (pfile, token, base)
|
|
cpp_reader *pfile;
|
|
cpp_token *token;
|
|
const uchar *base;
|
|
{
|
|
bool saw_NUL = false;
|
|
const uchar *cur;
|
|
cppchar_t terminator;
|
|
enum cpp_ttype type;
|
|
|
|
cur = base;
|
|
terminator = *cur++;
|
|
if (terminator == 'L')
|
|
terminator = *cur++;
|
|
if (terminator == '\"')
|
|
type = *base == 'L' ? CPP_WSTRING: CPP_STRING;
|
|
else if (terminator == '\'')
|
|
type = *base == 'L' ? CPP_WCHAR: CPP_CHAR;
|
|
else
|
|
terminator = '>', type = CPP_HEADER_NAME;
|
|
|
|
for (;;)
|
|
{
|
|
cppchar_t c = *cur++;
|
|
|
|
/* In #include-style directives, terminators are not escapable. */
|
|
if (c == '\\' && !pfile->state.angled_headers && *cur != '\n')
|
|
cur++;
|
|
else if (c == terminator)
|
|
break;
|
|
else if (c == '\n')
|
|
{
|
|
cur--;
|
|
type = CPP_OTHER;
|
|
break;
|
|
}
|
|
else if (c == '\0')
|
|
saw_NUL = true;
|
|
}
|
|
|
|
if (saw_NUL && !pfile->state.skipping)
|
|
cpp_error (pfile, DL_WARNING, "null character(s) preserved in literal");
|
|
|
|
pfile->buffer->cur = cur;
|
|
create_literal (pfile, token, base, cur - base, type);
|
|
}
|
|
|
|
/* The stored comment includes the comment start and any terminator. */
|
|
static void
|
|
save_comment (pfile, token, from, type)
|
|
cpp_reader *pfile;
|
|
cpp_token *token;
|
|
const unsigned char *from;
|
|
cppchar_t type;
|
|
{
|
|
unsigned char *buffer;
|
|
unsigned int len, clen;
|
|
|
|
len = pfile->buffer->cur - from + 1; /* + 1 for the initial '/'. */
|
|
|
|
/* C++ comments probably (not definitely) have moved past a new
|
|
line, which we don't want to save in the comment. */
|
|
if (is_vspace (pfile->buffer->cur[-1]))
|
|
len--;
|
|
|
|
/* If we are currently in a directive, then we need to store all
|
|
C++ comments as C comments internally, and so we need to
|
|
allocate a little extra space in that case.
|
|
|
|
Note that the only time we encounter a directive here is
|
|
when we are saving comments in a "#define". */
|
|
clen = (pfile->state.in_directive && type == '/') ? len + 2 : len;
|
|
|
|
buffer = _cpp_unaligned_alloc (pfile, clen);
|
|
|
|
token->type = CPP_COMMENT;
|
|
token->val.str.len = clen;
|
|
token->val.str.text = buffer;
|
|
|
|
buffer[0] = '/';
|
|
memcpy (buffer + 1, from, len - 1);
|
|
|
|
/* Finish conversion to a C comment, if necessary. */
|
|
if (pfile->state.in_directive && type == '/')
|
|
{
|
|
buffer[1] = '*';
|
|
buffer[clen - 2] = '*';
|
|
buffer[clen - 1] = '/';
|
|
}
|
|
}
|
|
|
|
/* Allocate COUNT tokens for RUN. */
|
|
void
|
|
_cpp_init_tokenrun (run, count)
|
|
tokenrun *run;
|
|
unsigned int count;
|
|
{
|
|
run->base = xnewvec (cpp_token, count);
|
|
run->limit = run->base + count;
|
|
run->next = NULL;
|
|
}
|
|
|
|
/* Returns the next tokenrun, or creates one if there is none. */
|
|
static tokenrun *
|
|
next_tokenrun (run)
|
|
tokenrun *run;
|
|
{
|
|
if (run->next == NULL)
|
|
{
|
|
run->next = xnew (tokenrun);
|
|
run->next->prev = run;
|
|
_cpp_init_tokenrun (run->next, 250);
|
|
}
|
|
|
|
return run->next;
|
|
}
|
|
|
|
/* Allocate a single token that is invalidated at the same time as the
|
|
rest of the tokens on the line. Has its line and col set to the
|
|
same as the last lexed token, so that diagnostics appear in the
|
|
right place. */
|
|
cpp_token *
|
|
_cpp_temp_token (pfile)
|
|
cpp_reader *pfile;
|
|
{
|
|
cpp_token *old, *result;
|
|
|
|
old = pfile->cur_token - 1;
|
|
if (pfile->cur_token == pfile->cur_run->limit)
|
|
{
|
|
pfile->cur_run = next_tokenrun (pfile->cur_run);
|
|
pfile->cur_token = pfile->cur_run->base;
|
|
}
|
|
|
|
result = pfile->cur_token++;
|
|
result->line = old->line;
|
|
result->col = old->col;
|
|
return result;
|
|
}
|
|
|
|
/* Lex a token into RESULT (external interface). Takes care of issues
|
|
like directive handling, token lookahead, multiple include
|
|
optimization and skipping. */
|
|
const cpp_token *
|
|
_cpp_lex_token (pfile)
|
|
cpp_reader *pfile;
|
|
{
|
|
cpp_token *result;
|
|
|
|
for (;;)
|
|
{
|
|
if (pfile->cur_token == pfile->cur_run->limit)
|
|
{
|
|
pfile->cur_run = next_tokenrun (pfile->cur_run);
|
|
pfile->cur_token = pfile->cur_run->base;
|
|
}
|
|
|
|
if (pfile->lookaheads)
|
|
{
|
|
pfile->lookaheads--;
|
|
result = pfile->cur_token++;
|
|
}
|
|
else
|
|
result = _cpp_lex_direct (pfile);
|
|
|
|
if (result->flags & BOL)
|
|
{
|
|
/* Is this a directive. If _cpp_handle_directive returns
|
|
false, it is an assembler #. */
|
|
if (result->type == CPP_HASH
|
|
/* 6.10.3 p 11: Directives in a list of macro arguments
|
|
gives undefined behavior. This implementation
|
|
handles the directive as normal. */
|
|
&& pfile->state.parsing_args != 1
|
|
&& _cpp_handle_directive (pfile, result->flags & PREV_WHITE))
|
|
continue;
|
|
if (pfile->cb.line_change && !pfile->state.skipping)
|
|
(*pfile->cb.line_change)(pfile, result, pfile->state.parsing_args);
|
|
}
|
|
|
|
/* We don't skip tokens in directives. */
|
|
if (pfile->state.in_directive)
|
|
break;
|
|
|
|
/* Outside a directive, invalidate controlling macros. At file
|
|
EOF, _cpp_lex_direct takes care of popping the buffer, so we never
|
|
get here and MI optimisation works. */
|
|
pfile->mi_valid = false;
|
|
|
|
if (!pfile->state.skipping || result->type == CPP_EOF)
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Returns true if a fresh line has been loaded. */
|
|
bool
|
|
_cpp_get_fresh_line (pfile)
|
|
cpp_reader *pfile;
|
|
{
|
|
/* We can't get a new line until we leave the current directive. */
|
|
if (pfile->state.in_directive)
|
|
return false;
|
|
|
|
for (;;)
|
|
{
|
|
cpp_buffer *buffer = pfile->buffer;
|
|
|
|
if (!buffer->need_line)
|
|
return true;
|
|
|
|
if (buffer->next_line < buffer->rlimit)
|
|
{
|
|
_cpp_clean_line (pfile);
|
|
return true;
|
|
}
|
|
|
|
/* First, get out of parsing arguments state. */
|
|
if (pfile->state.parsing_args)
|
|
return false;
|
|
|
|
/* End of buffer. Non-empty files should end in a newline. */
|
|
if (buffer->buf != buffer->rlimit
|
|
&& buffer->next_line > buffer->rlimit
|
|
&& !buffer->from_stage3)
|
|
{
|
|
/* Only warn once. */
|
|
buffer->next_line = buffer->rlimit;
|
|
cpp_error_with_line (pfile, DL_PEDWARN, pfile->line - 1,
|
|
CPP_BUF_COLUMN (buffer, buffer->cur),
|
|
"no newline at end of file");
|
|
}
|
|
|
|
if (!buffer->prev)
|
|
return false;
|
|
|
|
if (buffer->return_at_eof)
|
|
{
|
|
_cpp_pop_buffer (pfile);
|
|
return false;
|
|
}
|
|
|
|
_cpp_pop_buffer (pfile);
|
|
}
|
|
}
|
|
|
|
#define IF_NEXT_IS(CHAR, THEN_TYPE, ELSE_TYPE) \
|
|
do \
|
|
{ \
|
|
result->type = ELSE_TYPE; \
|
|
if (*buffer->cur == CHAR) \
|
|
buffer->cur++, result->type = THEN_TYPE; \
|
|
} \
|
|
while (0)
|
|
|
|
/* Lex a token into pfile->cur_token, which is also incremented, to
|
|
get diagnostics pointing to the correct location.
|
|
|
|
Does not handle issues such as token lookahead, multiple-include
|
|
optimisation, directives, skipping etc. This function is only
|
|
suitable for use by _cpp_lex_token, and in special cases like
|
|
lex_expansion_token which doesn't care for any of these issues.
|
|
|
|
When meeting a newline, returns CPP_EOF if parsing a directive,
|
|
otherwise returns to the start of the token buffer if permissible.
|
|
Returns the location of the lexed token. */
|
|
cpp_token *
|
|
_cpp_lex_direct (pfile)
|
|
cpp_reader *pfile;
|
|
{
|
|
cppchar_t c;
|
|
cpp_buffer *buffer;
|
|
const unsigned char *comment_start;
|
|
cpp_token *result = pfile->cur_token++;
|
|
|
|
fresh_line:
|
|
result->flags = 0;
|
|
if (pfile->buffer->need_line)
|
|
{
|
|
if (!_cpp_get_fresh_line (pfile))
|
|
{
|
|
result->type = CPP_EOF;
|
|
if (!pfile->state.in_directive)
|
|
{
|
|
/* Tell the compiler the line number of the EOF token. */
|
|
result->line = pfile->line;
|
|
result->flags = BOL;
|
|
}
|
|
return result;
|
|
}
|
|
if (!pfile->keep_tokens)
|
|
{
|
|
pfile->cur_run = &pfile->base_run;
|
|
result = pfile->base_run.base;
|
|
pfile->cur_token = result + 1;
|
|
}
|
|
result->flags = BOL;
|
|
if (pfile->state.parsing_args == 2)
|
|
result->flags |= PREV_WHITE;
|
|
}
|
|
buffer = pfile->buffer;
|
|
update_tokens_line:
|
|
result->line = pfile->line;
|
|
|
|
skipped_white:
|
|
if (buffer->cur >= buffer->notes[buffer->cur_note].pos
|
|
&& !pfile->overlaid_buffer)
|
|
{
|
|
_cpp_process_line_notes (pfile, false);
|
|
result->line = pfile->line;
|
|
}
|
|
c = *buffer->cur++;
|
|
result->col = CPP_BUF_COLUMN (buffer, buffer->cur);
|
|
|
|
switch (c)
|
|
{
|
|
case ' ': case '\t': case '\f': case '\v': case '\0':
|
|
result->flags |= PREV_WHITE;
|
|
skip_whitespace (pfile, c);
|
|
goto skipped_white;
|
|
|
|
case '\n':
|
|
pfile->line++;
|
|
buffer->need_line = true;
|
|
goto fresh_line;
|
|
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
result->type = CPP_NUMBER;
|
|
lex_number (pfile, &result->val.str);
|
|
break;
|
|
|
|
case 'L':
|
|
/* 'L' may introduce wide characters or strings. */
|
|
if (*buffer->cur == '\'' || *buffer->cur == '"')
|
|
{
|
|
lex_string (pfile, result, buffer->cur - 1);
|
|
break;
|
|
}
|
|
/* Fall through. */
|
|
|
|
case '_':
|
|
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
|
|
case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
|
|
case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
|
|
case 's': case 't': case 'u': case 'v': case 'w': case 'x':
|
|
case 'y': case 'z':
|
|
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
|
|
case 'G': case 'H': case 'I': case 'J': case 'K':
|
|
case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
|
|
case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
|
|
case 'Y': case 'Z':
|
|
result->type = CPP_NAME;
|
|
result->val.node = lex_identifier (pfile, buffer->cur - 1);
|
|
|
|
/* Convert named operators to their proper types. */
|
|
if (result->val.node->flags & NODE_OPERATOR)
|
|
{
|
|
result->flags |= NAMED_OP;
|
|
result->type = result->val.node->directive_index;
|
|
}
|
|
break;
|
|
|
|
case '\'':
|
|
case '"':
|
|
lex_string (pfile, result, buffer->cur - 1);
|
|
break;
|
|
|
|
case '/':
|
|
/* A potential block or line comment. */
|
|
comment_start = buffer->cur;
|
|
c = *buffer->cur;
|
|
|
|
if (c == '*')
|
|
{
|
|
if (_cpp_skip_block_comment (pfile))
|
|
cpp_error (pfile, DL_ERROR, "unterminated comment");
|
|
}
|
|
else if (c == '/' && (CPP_OPTION (pfile, cplusplus_comments)
|
|
|| CPP_IN_SYSTEM_HEADER (pfile)))
|
|
{
|
|
/* Warn about comments only if pedantically GNUC89, and not
|
|
in system headers. */
|
|
if (CPP_OPTION (pfile, lang) == CLK_GNUC89 && CPP_PEDANTIC (pfile)
|
|
&& ! buffer->warned_cplusplus_comments)
|
|
{
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"C++ style comments are not allowed in ISO C90");
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"(this will be reported only once per input file)");
|
|
buffer->warned_cplusplus_comments = 1;
|
|
}
|
|
|
|
if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
|
|
cpp_error (pfile, DL_WARNING, "multi-line comment");
|
|
}
|
|
else if (c == '=')
|
|
{
|
|
buffer->cur++;
|
|
result->type = CPP_DIV_EQ;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
result->type = CPP_DIV;
|
|
break;
|
|
}
|
|
|
|
if (!pfile->state.save_comments)
|
|
{
|
|
result->flags |= PREV_WHITE;
|
|
goto update_tokens_line;
|
|
}
|
|
|
|
/* Save the comment as a token in its own right. */
|
|
save_comment (pfile, result, comment_start, c);
|
|
break;
|
|
|
|
case '<':
|
|
if (pfile->state.angled_headers)
|
|
{
|
|
lex_string (pfile, result, buffer->cur - 1);
|
|
break;
|
|
}
|
|
|
|
result->type = CPP_LESS;
|
|
if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_LESS_EQ;
|
|
else if (*buffer->cur == '<')
|
|
{
|
|
buffer->cur++;
|
|
IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
|
|
}
|
|
else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
|
|
{
|
|
buffer->cur++;
|
|
IF_NEXT_IS ('=', CPP_MIN_EQ, CPP_MIN);
|
|
}
|
|
else if (CPP_OPTION (pfile, digraphs))
|
|
{
|
|
if (*buffer->cur == ':')
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_OPEN_SQUARE;
|
|
}
|
|
else if (*buffer->cur == '%')
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_OPEN_BRACE;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '>':
|
|
result->type = CPP_GREATER;
|
|
if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_GREATER_EQ;
|
|
else if (*buffer->cur == '>')
|
|
{
|
|
buffer->cur++;
|
|
IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
|
|
}
|
|
else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
|
|
{
|
|
buffer->cur++;
|
|
IF_NEXT_IS ('=', CPP_MAX_EQ, CPP_MAX);
|
|
}
|
|
break;
|
|
|
|
case '%':
|
|
result->type = CPP_MOD;
|
|
if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_MOD_EQ;
|
|
else if (CPP_OPTION (pfile, digraphs))
|
|
{
|
|
if (*buffer->cur == ':')
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_HASH;
|
|
if (*buffer->cur == '%' && buffer->cur[1] == ':')
|
|
buffer->cur += 2, result->type = CPP_PASTE;
|
|
}
|
|
else if (*buffer->cur == '>')
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_CLOSE_BRACE;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '.':
|
|
result->type = CPP_DOT;
|
|
if (ISDIGIT (*buffer->cur))
|
|
{
|
|
result->type = CPP_NUMBER;
|
|
lex_number (pfile, &result->val.str);
|
|
}
|
|
else if (*buffer->cur == '.' && buffer->cur[1] == '.')
|
|
buffer->cur += 2, result->type = CPP_ELLIPSIS;
|
|
else if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
|
|
buffer->cur++, result->type = CPP_DOT_STAR;
|
|
break;
|
|
|
|
case '+':
|
|
result->type = CPP_PLUS;
|
|
if (*buffer->cur == '+')
|
|
buffer->cur++, result->type = CPP_PLUS_PLUS;
|
|
else if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_PLUS_EQ;
|
|
break;
|
|
|
|
case '-':
|
|
result->type = CPP_MINUS;
|
|
if (*buffer->cur == '>')
|
|
{
|
|
buffer->cur++;
|
|
result->type = CPP_DEREF;
|
|
if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
|
|
buffer->cur++, result->type = CPP_DEREF_STAR;
|
|
}
|
|
else if (*buffer->cur == '-')
|
|
buffer->cur++, result->type = CPP_MINUS_MINUS;
|
|
else if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_MINUS_EQ;
|
|
break;
|
|
|
|
case '&':
|
|
result->type = CPP_AND;
|
|
if (*buffer->cur == '&')
|
|
buffer->cur++, result->type = CPP_AND_AND;
|
|
else if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_AND_EQ;
|
|
break;
|
|
|
|
case '|':
|
|
result->type = CPP_OR;
|
|
if (*buffer->cur == '|')
|
|
buffer->cur++, result->type = CPP_OR_OR;
|
|
else if (*buffer->cur == '=')
|
|
buffer->cur++, result->type = CPP_OR_EQ;
|
|
break;
|
|
|
|
case ':':
|
|
result->type = CPP_COLON;
|
|
if (*buffer->cur == ':' && CPP_OPTION (pfile, cplusplus))
|
|
buffer->cur++, result->type = CPP_SCOPE;
|
|
else if (*buffer->cur == '>' && CPP_OPTION (pfile, digraphs))
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_CLOSE_SQUARE;
|
|
}
|
|
break;
|
|
|
|
case '*': IF_NEXT_IS ('=', CPP_MULT_EQ, CPP_MULT); break;
|
|
case '=': IF_NEXT_IS ('=', CPP_EQ_EQ, CPP_EQ); break;
|
|
case '!': IF_NEXT_IS ('=', CPP_NOT_EQ, CPP_NOT); break;
|
|
case '^': IF_NEXT_IS ('=', CPP_XOR_EQ, CPP_XOR); break;
|
|
case '#': IF_NEXT_IS ('#', CPP_PASTE, CPP_HASH); break;
|
|
|
|
case '?': result->type = CPP_QUERY; break;
|
|
case '~': result->type = CPP_COMPL; break;
|
|
case ',': result->type = CPP_COMMA; break;
|
|
case '(': result->type = CPP_OPEN_PAREN; break;
|
|
case ')': result->type = CPP_CLOSE_PAREN; break;
|
|
case '[': result->type = CPP_OPEN_SQUARE; break;
|
|
case ']': result->type = CPP_CLOSE_SQUARE; break;
|
|
case '{': result->type = CPP_OPEN_BRACE; break;
|
|
case '}': result->type = CPP_CLOSE_BRACE; break;
|
|
case ';': result->type = CPP_SEMICOLON; break;
|
|
|
|
/* @ is a punctuator in Objective-C. */
|
|
case '@': result->type = CPP_ATSIGN; break;
|
|
|
|
case '$':
|
|
case '\\':
|
|
{
|
|
const uchar *base = --buffer->cur;
|
|
|
|
if (forms_identifier_p (pfile, true))
|
|
{
|
|
result->type = CPP_NAME;
|
|
result->val.node = lex_identifier (pfile, base);
|
|
break;
|
|
}
|
|
buffer->cur++;
|
|
}
|
|
|
|
default:
|
|
create_literal (pfile, result, buffer->cur - 1, 1, CPP_OTHER);
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* An upper bound on the number of bytes needed to spell TOKEN.
|
|
Does not include preceding whitespace. */
|
|
unsigned int
|
|
cpp_token_len (token)
|
|
const cpp_token *token;
|
|
{
|
|
unsigned int len;
|
|
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
default: len = 4; break;
|
|
case SPELL_LITERAL: len = token->val.str.len; break;
|
|
case SPELL_IDENT: len = NODE_LEN (token->val.node); break;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/* Write the spelling of a token TOKEN to BUFFER. The buffer must
|
|
already contain the enough space to hold the token's spelling.
|
|
Returns a pointer to the character after the last character
|
|
written. */
|
|
unsigned char *
|
|
cpp_spell_token (pfile, token, buffer)
|
|
cpp_reader *pfile; /* Would be nice to be rid of this... */
|
|
const cpp_token *token;
|
|
unsigned char *buffer;
|
|
{
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
case SPELL_OPERATOR:
|
|
{
|
|
const unsigned char *spelling;
|
|
unsigned char c;
|
|
|
|
if (token->flags & DIGRAPH)
|
|
spelling
|
|
= digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH];
|
|
else if (token->flags & NAMED_OP)
|
|
goto spell_ident;
|
|
else
|
|
spelling = TOKEN_NAME (token);
|
|
|
|
while ((c = *spelling++) != '\0')
|
|
*buffer++ = c;
|
|
}
|
|
break;
|
|
|
|
spell_ident:
|
|
case SPELL_IDENT:
|
|
memcpy (buffer, NODE_NAME (token->val.node), NODE_LEN (token->val.node));
|
|
buffer += NODE_LEN (token->val.node);
|
|
break;
|
|
|
|
case SPELL_LITERAL:
|
|
memcpy (buffer, token->val.str.text, token->val.str.len);
|
|
buffer += token->val.str.len;
|
|
break;
|
|
|
|
case SPELL_NONE:
|
|
cpp_error (pfile, DL_ICE, "unspellable token %s", TOKEN_NAME (token));
|
|
break;
|
|
}
|
|
|
|
return buffer;
|
|
}
|
|
|
|
/* Returns TOKEN spelt as a null-terminated string. The string is
|
|
freed when the reader is destroyed. Useful for diagnostics. */
|
|
unsigned char *
|
|
cpp_token_as_text (pfile, token)
|
|
cpp_reader *pfile;
|
|
const cpp_token *token;
|
|
{
|
|
unsigned int len = cpp_token_len (token) + 1;
|
|
unsigned char *start = _cpp_unaligned_alloc (pfile, len), *end;
|
|
|
|
end = cpp_spell_token (pfile, token, start);
|
|
end[0] = '\0';
|
|
|
|
return start;
|
|
}
|
|
|
|
/* Used by C front ends, which really should move to using
|
|
cpp_token_as_text. */
|
|
const char *
|
|
cpp_type2name (type)
|
|
enum cpp_ttype type;
|
|
{
|
|
return (const char *) token_spellings[type].name;
|
|
}
|
|
|
|
/* Writes the spelling of token to FP, without any preceding space.
|
|
Separated from cpp_spell_token for efficiency - to avoid stdio
|
|
double-buffering. */
|
|
void
|
|
cpp_output_token (token, fp)
|
|
const cpp_token *token;
|
|
FILE *fp;
|
|
{
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
case SPELL_OPERATOR:
|
|
{
|
|
const unsigned char *spelling;
|
|
int c;
|
|
|
|
if (token->flags & DIGRAPH)
|
|
spelling
|
|
= digraph_spellings[(int) token->type - (int) CPP_FIRST_DIGRAPH];
|
|
else if (token->flags & NAMED_OP)
|
|
goto spell_ident;
|
|
else
|
|
spelling = TOKEN_NAME (token);
|
|
|
|
c = *spelling;
|
|
do
|
|
putc (c, fp);
|
|
while ((c = *++spelling) != '\0');
|
|
}
|
|
break;
|
|
|
|
spell_ident:
|
|
case SPELL_IDENT:
|
|
fwrite (NODE_NAME (token->val.node), 1, NODE_LEN (token->val.node), fp);
|
|
break;
|
|
|
|
case SPELL_LITERAL:
|
|
fwrite (token->val.str.text, 1, token->val.str.len, fp);
|
|
break;
|
|
|
|
case SPELL_NONE:
|
|
/* An error, most probably. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Compare two tokens. */
|
|
int
|
|
_cpp_equiv_tokens (a, b)
|
|
const cpp_token *a, *b;
|
|
{
|
|
if (a->type == b->type && a->flags == b->flags)
|
|
switch (TOKEN_SPELL (a))
|
|
{
|
|
default: /* Keep compiler happy. */
|
|
case SPELL_OPERATOR:
|
|
return 1;
|
|
case SPELL_NONE:
|
|
return (a->type != CPP_MACRO_ARG || a->val.arg_no == b->val.arg_no);
|
|
case SPELL_IDENT:
|
|
return a->val.node == b->val.node;
|
|
case SPELL_LITERAL:
|
|
return (a->val.str.len == b->val.str.len
|
|
&& !memcmp (a->val.str.text, b->val.str.text,
|
|
a->val.str.len));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Returns nonzero if a space should be inserted to avoid an
|
|
accidental token paste for output. For simplicity, it is
|
|
conservative, and occasionally advises a space where one is not
|
|
needed, e.g. "." and ".2". */
|
|
int
|
|
cpp_avoid_paste (pfile, token1, token2)
|
|
cpp_reader *pfile;
|
|
const cpp_token *token1, *token2;
|
|
{
|
|
enum cpp_ttype a = token1->type, b = token2->type;
|
|
cppchar_t c;
|
|
|
|
if (token1->flags & NAMED_OP)
|
|
a = CPP_NAME;
|
|
if (token2->flags & NAMED_OP)
|
|
b = CPP_NAME;
|
|
|
|
c = EOF;
|
|
if (token2->flags & DIGRAPH)
|
|
c = digraph_spellings[(int) b - (int) CPP_FIRST_DIGRAPH][0];
|
|
else if (token_spellings[b].category == SPELL_OPERATOR)
|
|
c = token_spellings[b].name[0];
|
|
|
|
/* Quickly get everything that can paste with an '='. */
|
|
if ((int) a <= (int) CPP_LAST_EQ && c == '=')
|
|
return 1;
|
|
|
|
switch (a)
|
|
{
|
|
case CPP_GREATER: return c == '>' || c == '?';
|
|
case CPP_LESS: return c == '<' || c == '?' || c == '%' || c == ':';
|
|
case CPP_PLUS: return c == '+';
|
|
case CPP_MINUS: return c == '-' || c == '>';
|
|
case CPP_DIV: return c == '/' || c == '*'; /* Comments. */
|
|
case CPP_MOD: return c == ':' || c == '>';
|
|
case CPP_AND: return c == '&';
|
|
case CPP_OR: return c == '|';
|
|
case CPP_COLON: return c == ':' || c == '>';
|
|
case CPP_DEREF: return c == '*';
|
|
case CPP_DOT: return c == '.' || c == '%' || b == CPP_NUMBER;
|
|
case CPP_HASH: return c == '#' || c == '%'; /* Digraph form. */
|
|
case CPP_NAME: return ((b == CPP_NUMBER
|
|
&& name_p (pfile, &token2->val.str))
|
|
|| b == CPP_NAME
|
|
|| b == CPP_CHAR || b == CPP_STRING); /* L */
|
|
case CPP_NUMBER: return (b == CPP_NUMBER || b == CPP_NAME
|
|
|| c == '.' || c == '+' || c == '-');
|
|
/* UCNs */
|
|
case CPP_OTHER: return ((token1->val.str.text[0] == '\\'
|
|
&& b == CPP_NAME)
|
|
|| (CPP_OPTION (pfile, objc)
|
|
&& token1->val.str.text[0] == '@'
|
|
&& (b == CPP_NAME || b == CPP_STRING)));
|
|
default: break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Output all the remaining tokens on the current line, and a newline
|
|
character, to FP. Leading whitespace is removed. If there are
|
|
macros, special token padding is not performed. */
|
|
void
|
|
cpp_output_line (pfile, fp)
|
|
cpp_reader *pfile;
|
|
FILE *fp;
|
|
{
|
|
const cpp_token *token;
|
|
|
|
token = cpp_get_token (pfile);
|
|
while (token->type != CPP_EOF)
|
|
{
|
|
cpp_output_token (token, fp);
|
|
token = cpp_get_token (pfile);
|
|
if (token->flags & PREV_WHITE)
|
|
putc (' ', fp);
|
|
}
|
|
|
|
putc ('\n', fp);
|
|
}
|
|
|
|
/* Returns the value of a hexadecimal digit. */
|
|
static unsigned int
|
|
hex_digit_value (c)
|
|
unsigned int c;
|
|
{
|
|
if (hex_p (c))
|
|
return hex_value (c);
|
|
else
|
|
abort ();
|
|
}
|
|
|
|
/* Read a possible universal character name starting at *PSTR. */
|
|
static cppchar_t
|
|
maybe_read_ucn (pfile, pstr)
|
|
cpp_reader *pfile;
|
|
const uchar **pstr;
|
|
{
|
|
cppchar_t result, c = (*pstr)[-1];
|
|
|
|
result = _cpp_valid_ucn (pfile, pstr, false);
|
|
if (result)
|
|
{
|
|
if (CPP_WTRADITIONAL (pfile))
|
|
cpp_error (pfile, DL_WARNING,
|
|
"the meaning of '\\%c' is different in traditional C",
|
|
(int) c);
|
|
|
|
if (CPP_OPTION (pfile, EBCDIC))
|
|
{
|
|
cpp_error (pfile, DL_ERROR,
|
|
"universal character with an EBCDIC target");
|
|
result = 0x3f; /* EBCDIC invalid character */
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Returns the value of an escape sequence, truncated to the correct
|
|
target precision. PSTR points to the input pointer, which is just
|
|
after the backslash. LIMIT is how much text we have. WIDE is true
|
|
if the escape sequence is part of a wide character constant or
|
|
string literal. Handles all relevant diagnostics. */
|
|
cppchar_t
|
|
cpp_parse_escape (pfile, pstr, limit, wide)
|
|
cpp_reader *pfile;
|
|
const unsigned char **pstr;
|
|
const unsigned char *limit;
|
|
int wide;
|
|
{
|
|
/* Values of \a \b \e \f \n \r \t \v respectively. */
|
|
static const uchar ascii[] = { 7, 8, 27, 12, 10, 13, 9, 11 };
|
|
static const uchar ebcdic[] = { 47, 22, 39, 12, 21, 13, 5, 11 };
|
|
|
|
int unknown = 0;
|
|
const unsigned char *str = *pstr, *charconsts;
|
|
cppchar_t c, ucn, mask;
|
|
unsigned int width;
|
|
|
|
if (CPP_OPTION (pfile, EBCDIC))
|
|
charconsts = ebcdic;
|
|
else
|
|
charconsts = ascii;
|
|
|
|
if (wide)
|
|
width = CPP_OPTION (pfile, wchar_precision);
|
|
else
|
|
width = CPP_OPTION (pfile, char_precision);
|
|
if (width < BITS_PER_CPPCHAR_T)
|
|
mask = ((cppchar_t) 1 << width) - 1;
|
|
else
|
|
mask = ~0;
|
|
|
|
c = *str++;
|
|
switch (c)
|
|
{
|
|
case '\\': case '\'': case '"': case '?': break;
|
|
case 'b': c = charconsts[1]; break;
|
|
case 'f': c = charconsts[3]; break;
|
|
case 'n': c = charconsts[4]; break;
|
|
case 'r': c = charconsts[5]; break;
|
|
case 't': c = charconsts[6]; break;
|
|
case 'v': c = charconsts[7]; break;
|
|
|
|
case '(': case '{': case '[': case '%':
|
|
/* '\(', etc, are used at beginning of line to avoid confusing Emacs.
|
|
'\%' is used to prevent SCCS from getting confused. */
|
|
unknown = CPP_PEDANTIC (pfile);
|
|
break;
|
|
|
|
case 'a':
|
|
if (CPP_WTRADITIONAL (pfile))
|
|
cpp_error (pfile, DL_WARNING,
|
|
"the meaning of '\\a' is different in traditional C");
|
|
c = charconsts[0];
|
|
break;
|
|
|
|
case 'e': case 'E':
|
|
if (CPP_PEDANTIC (pfile))
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"non-ISO-standard escape sequence, '\\%c'", (int) c);
|
|
c = charconsts[2];
|
|
break;
|
|
|
|
case 'u': case 'U':
|
|
ucn = maybe_read_ucn (pfile, &str);
|
|
if (ucn)
|
|
c = ucn;
|
|
else
|
|
unknown = true;
|
|
break;
|
|
|
|
case 'x':
|
|
if (CPP_WTRADITIONAL (pfile))
|
|
cpp_error (pfile, DL_WARNING,
|
|
"the meaning of '\\x' is different in traditional C");
|
|
|
|
{
|
|
cppchar_t i = 0, overflow = 0;
|
|
int digits_found = 0;
|
|
|
|
while (str < limit)
|
|
{
|
|
c = *str;
|
|
if (! ISXDIGIT (c))
|
|
break;
|
|
str++;
|
|
overflow |= i ^ (i << 4 >> 4);
|
|
i = (i << 4) + hex_digit_value (c);
|
|
digits_found = 1;
|
|
}
|
|
|
|
if (!digits_found)
|
|
cpp_error (pfile, DL_ERROR,
|
|
"\\x used with no following hex digits");
|
|
|
|
if (overflow | (i != (i & mask)))
|
|
{
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"hex escape sequence out of range");
|
|
i &= mask;
|
|
}
|
|
c = i;
|
|
}
|
|
break;
|
|
|
|
case '0': case '1': case '2': case '3':
|
|
case '4': case '5': case '6': case '7':
|
|
{
|
|
size_t count = 0;
|
|
cppchar_t i = c - '0';
|
|
|
|
while (str < limit && ++count < 3)
|
|
{
|
|
c = *str;
|
|
if (c < '0' || c > '7')
|
|
break;
|
|
str++;
|
|
i = (i << 3) + c - '0';
|
|
}
|
|
|
|
if (i != (i & mask))
|
|
{
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"octal escape sequence out of range");
|
|
i &= mask;
|
|
}
|
|
c = i;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
unknown = 1;
|
|
break;
|
|
}
|
|
|
|
if (unknown)
|
|
{
|
|
if (ISGRAPH (c))
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"unknown escape sequence '\\%c'", (int) c);
|
|
else
|
|
cpp_error (pfile, DL_PEDWARN,
|
|
"unknown escape sequence: '\\%03o'", (int) c);
|
|
}
|
|
|
|
if (c > mask)
|
|
{
|
|
cpp_error (pfile, DL_PEDWARN, "escape sequence out of range for its type");
|
|
c &= mask;
|
|
}
|
|
|
|
*pstr = str;
|
|
return c;
|
|
}
|
|
|
|
/* Interpret a (possibly wide) character constant in TOKEN.
|
|
WARN_MULTI warns about multi-character charconsts. PCHARS_SEEN
|
|
points to a variable that is filled in with the number of
|
|
characters seen, and UNSIGNEDP to a variable that indicates whether
|
|
the result has signed type. */
|
|
cppchar_t
|
|
cpp_interpret_charconst (pfile, token, pchars_seen, unsignedp)
|
|
cpp_reader *pfile;
|
|
const cpp_token *token;
|
|
unsigned int *pchars_seen;
|
|
int *unsignedp;
|
|
{
|
|
const unsigned char *str, *limit;
|
|
unsigned int chars_seen = 0;
|
|
size_t width, max_chars;
|
|
cppchar_t c, mask, result = 0;
|
|
bool unsigned_p;
|
|
|
|
str = token->val.str.text + 1 + (token->type == CPP_WCHAR);
|
|
limit = token->val.str.text + token->val.str.len - 1;
|
|
|
|
if (token->type == CPP_CHAR)
|
|
{
|
|
width = CPP_OPTION (pfile, char_precision);
|
|
max_chars = CPP_OPTION (pfile, int_precision) / width;
|
|
unsigned_p = CPP_OPTION (pfile, unsigned_char);
|
|
}
|
|
else
|
|
{
|
|
width = CPP_OPTION (pfile, wchar_precision);
|
|
max_chars = 1;
|
|
unsigned_p = CPP_OPTION (pfile, unsigned_wchar);
|
|
}
|
|
|
|
if (width < BITS_PER_CPPCHAR_T)
|
|
mask = ((cppchar_t) 1 << width) - 1;
|
|
else
|
|
mask = ~0;
|
|
|
|
while (str < limit)
|
|
{
|
|
c = *str++;
|
|
|
|
if (c == '\\')
|
|
c = cpp_parse_escape (pfile, &str, limit, token->type == CPP_WCHAR);
|
|
|
|
#ifdef MAP_CHARACTER
|
|
if (ISPRINT (c))
|
|
c = MAP_CHARACTER (c);
|
|
#endif
|
|
|
|
chars_seen++;
|
|
|
|
/* Truncate the character, scale the result and merge the two. */
|
|
c &= mask;
|
|
if (width < BITS_PER_CPPCHAR_T)
|
|
result = (result << width) | c;
|
|
else
|
|
result = c;
|
|
}
|
|
|
|
if (chars_seen == 0)
|
|
cpp_error (pfile, DL_ERROR, "empty character constant");
|
|
else if (chars_seen > 1)
|
|
{
|
|
/* Multichar charconsts are of type int and therefore signed. */
|
|
unsigned_p = 0;
|
|
|
|
if (chars_seen > max_chars)
|
|
{
|
|
chars_seen = max_chars;
|
|
cpp_error (pfile, DL_WARNING,
|
|
"character constant too long for its type");
|
|
}
|
|
else if (CPP_OPTION (pfile, warn_multichar))
|
|
cpp_error (pfile, DL_WARNING, "multi-character character constant");
|
|
}
|
|
|
|
/* Sign-extend or truncate the constant to cppchar_t. The value is
|
|
in WIDTH bits, but for multi-char charconsts it's value is the
|
|
full target type's width. */
|
|
if (chars_seen > 1)
|
|
width *= max_chars;
|
|
if (width < BITS_PER_CPPCHAR_T)
|
|
{
|
|
mask = ((cppchar_t) 1 << width) - 1;
|
|
if (unsigned_p || !(result & (1 << (width - 1))))
|
|
result &= mask;
|
|
else
|
|
result |= ~mask;
|
|
}
|
|
|
|
*pchars_seen = chars_seen;
|
|
*unsignedp = unsigned_p;
|
|
return result;
|
|
}
|
|
|
|
/* Memory buffers. Changing these three constants can have a dramatic
|
|
effect on performance. The values here are reasonable defaults,
|
|
but might be tuned. If you adjust them, be sure to test across a
|
|
range of uses of cpplib, including heavy nested function-like macro
|
|
expansion. Also check the change in peak memory usage (NJAMD is a
|
|
good tool for this). */
|
|
#define MIN_BUFF_SIZE 8000
|
|
#define BUFF_SIZE_UPPER_BOUND(MIN_SIZE) (MIN_BUFF_SIZE + (MIN_SIZE) * 3 / 2)
|
|
#define EXTENDED_BUFF_SIZE(BUFF, MIN_EXTRA) \
|
|
(MIN_EXTRA + ((BUFF)->limit - (BUFF)->cur) * 2)
|
|
|
|
#if MIN_BUFF_SIZE > BUFF_SIZE_UPPER_BOUND (0)
|
|
#error BUFF_SIZE_UPPER_BOUND must be at least as large as MIN_BUFF_SIZE!
|
|
#endif
|
|
|
|
/* Create a new allocation buffer. Place the control block at the end
|
|
of the buffer, so that buffer overflows will cause immediate chaos. */
|
|
static _cpp_buff *
|
|
new_buff (len)
|
|
size_t len;
|
|
{
|
|
_cpp_buff *result;
|
|
unsigned char *base;
|
|
|
|
if (len < MIN_BUFF_SIZE)
|
|
len = MIN_BUFF_SIZE;
|
|
len = CPP_ALIGN (len);
|
|
|
|
base = xmalloc (len + sizeof (_cpp_buff));
|
|
result = (_cpp_buff *) (base + len);
|
|
result->base = base;
|
|
result->cur = base;
|
|
result->limit = base + len;
|
|
result->next = NULL;
|
|
return result;
|
|
}
|
|
|
|
/* Place a chain of unwanted allocation buffers on the free list. */
|
|
void
|
|
_cpp_release_buff (pfile, buff)
|
|
cpp_reader *pfile;
|
|
_cpp_buff *buff;
|
|
{
|
|
_cpp_buff *end = buff;
|
|
|
|
while (end->next)
|
|
end = end->next;
|
|
end->next = pfile->free_buffs;
|
|
pfile->free_buffs = buff;
|
|
}
|
|
|
|
/* Return a free buffer of size at least MIN_SIZE. */
|
|
_cpp_buff *
|
|
_cpp_get_buff (pfile, min_size)
|
|
cpp_reader *pfile;
|
|
size_t min_size;
|
|
{
|
|
_cpp_buff *result, **p;
|
|
|
|
for (p = &pfile->free_buffs;; p = &(*p)->next)
|
|
{
|
|
size_t size;
|
|
|
|
if (*p == NULL)
|
|
return new_buff (min_size);
|
|
result = *p;
|
|
size = result->limit - result->base;
|
|
/* Return a buffer that's big enough, but don't waste one that's
|
|
way too big. */
|
|
if (size >= min_size && size <= BUFF_SIZE_UPPER_BOUND (min_size))
|
|
break;
|
|
}
|
|
|
|
*p = result->next;
|
|
result->next = NULL;
|
|
result->cur = result->base;
|
|
return result;
|
|
}
|
|
|
|
/* Creates a new buffer with enough space to hold the uncommitted
|
|
remaining bytes of BUFF, and at least MIN_EXTRA more bytes. Copies
|
|
the excess bytes to the new buffer. Chains the new buffer after
|
|
BUFF, and returns the new buffer. */
|
|
_cpp_buff *
|
|
_cpp_append_extend_buff (pfile, buff, min_extra)
|
|
cpp_reader *pfile;
|
|
_cpp_buff *buff;
|
|
size_t min_extra;
|
|
{
|
|
size_t size = EXTENDED_BUFF_SIZE (buff, min_extra);
|
|
_cpp_buff *new_buff = _cpp_get_buff (pfile, size);
|
|
|
|
buff->next = new_buff;
|
|
memcpy (new_buff->base, buff->cur, BUFF_ROOM (buff));
|
|
return new_buff;
|
|
}
|
|
|
|
/* Creates a new buffer with enough space to hold the uncommitted
|
|
remaining bytes of the buffer pointed to by BUFF, and at least
|
|
MIN_EXTRA more bytes. Copies the excess bytes to the new buffer.
|
|
Chains the new buffer before the buffer pointed to by BUFF, and
|
|
updates the pointer to point to the new buffer. */
|
|
void
|
|
_cpp_extend_buff (pfile, pbuff, min_extra)
|
|
cpp_reader *pfile;
|
|
_cpp_buff **pbuff;
|
|
size_t min_extra;
|
|
{
|
|
_cpp_buff *new_buff, *old_buff = *pbuff;
|
|
size_t size = EXTENDED_BUFF_SIZE (old_buff, min_extra);
|
|
|
|
new_buff = _cpp_get_buff (pfile, size);
|
|
memcpy (new_buff->base, old_buff->cur, BUFF_ROOM (old_buff));
|
|
new_buff->next = old_buff;
|
|
*pbuff = new_buff;
|
|
}
|
|
|
|
/* Free a chain of buffers starting at BUFF. */
|
|
void
|
|
_cpp_free_buff (buff)
|
|
_cpp_buff *buff;
|
|
{
|
|
_cpp_buff *next;
|
|
|
|
for (; buff; buff = next)
|
|
{
|
|
next = buff->next;
|
|
free (buff->base);
|
|
}
|
|
}
|
|
|
|
/* Allocate permanent, unaligned storage of length LEN. */
|
|
unsigned char *
|
|
_cpp_unaligned_alloc (pfile, len)
|
|
cpp_reader *pfile;
|
|
size_t len;
|
|
{
|
|
_cpp_buff *buff = pfile->u_buff;
|
|
unsigned char *result = buff->cur;
|
|
|
|
if (len > (size_t) (buff->limit - result))
|
|
{
|
|
buff = _cpp_get_buff (pfile, len);
|
|
buff->next = pfile->u_buff;
|
|
pfile->u_buff = buff;
|
|
result = buff->cur;
|
|
}
|
|
|
|
buff->cur = result + len;
|
|
return result;
|
|
}
|
|
|
|
/* Allocate permanent, unaligned storage of length LEN from a_buff.
|
|
That buffer is used for growing allocations when saving macro
|
|
replacement lists in a #define, and when parsing an answer to an
|
|
assertion in #assert, #unassert or #if (and therefore possibly
|
|
whilst expanding macros). It therefore must not be used by any
|
|
code that they might call: specifically the lexer and the guts of
|
|
the macro expander.
|
|
|
|
All existing other uses clearly fit this restriction: storing
|
|
registered pragmas during initialization. */
|
|
unsigned char *
|
|
_cpp_aligned_alloc (pfile, len)
|
|
cpp_reader *pfile;
|
|
size_t len;
|
|
{
|
|
_cpp_buff *buff = pfile->a_buff;
|
|
unsigned char *result = buff->cur;
|
|
|
|
if (len > (size_t) (buff->limit - result))
|
|
{
|
|
buff = _cpp_get_buff (pfile, len);
|
|
buff->next = pfile->a_buff;
|
|
pfile->a_buff = buff;
|
|
result = buff->cur;
|
|
}
|
|
|
|
buff->cur = result + len;
|
|
return result;
|
|
}
|