9a0c618755
gcc: * c-lex.c (c_lex_with_flags): Expect cpp_hashnode in tok->val.node.node. libcpp: * include/cpplib.h (enum cpp_token_fld_kind): Add CPP_TOKEN_FLD_TOKEN_NO. (struct cpp_macro_arg, struct cpp_identifier): Define. (union cpp_token_u): Use struct cpp_identifier for identifiers. Use struct cpp_macro_arg for macro arguments. Add token_no for CPP_PASTE token numbers. * directives.c (_cpp_handle_directive, lex_macro_node, do_pragma, do_pragma_poison, parse_assertion): Use val.node.node in place of val.node. * expr.c (parse_defined, eval_token): Use val.node.node in place of val.node. * lex.c (cpp_ideq, _cpp_lex_direct, cpp_token_len, cpp_spell_token, cpp_output_token, _cpp_equiv_tokens, cpp_token_val_index): Use val.macro_arg.arg_no or val.token_no in place of val.arg_no. Use val.node.node in place of val.node. * macro.c (replace_args, cpp_get_token, parse_params, lex_expansion_token, create_iso_definition, cpp_macro_definition): Use val.macro_arg.arg_no or val.token_no in place of val.arg_no. Use val.node.node in place of val.node. From-SVN: r147341
1920 lines
52 KiB
C
1920 lines
52 KiB
C
/* CPP Library - lexical analysis.
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Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
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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 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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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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{ UC"%:", UC"%:%:", UC"<:", UC":>", UC"<%", UC"%>" };
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#define OP(e, s) { SPELL_OPERATOR, UC s },
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#define TK(e, s) { SPELL_ ## s, UC #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 (cpp_buffer *, const uchar *, unsigned int);
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static int skip_line_comment (cpp_reader *);
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static void skip_whitespace (cpp_reader *, cppchar_t);
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static void lex_string (cpp_reader *, cpp_token *, const uchar *);
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static void save_comment (cpp_reader *, cpp_token *, const uchar *, cppchar_t);
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static void store_comment (cpp_reader *, cpp_token *);
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static void create_literal (cpp_reader *, cpp_token *, const uchar *,
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unsigned int, enum cpp_ttype);
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static bool warn_in_comment (cpp_reader *, _cpp_line_note *);
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static int name_p (cpp_reader *, const cpp_string *);
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static tokenrun *next_tokenrun (tokenrun *);
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static _cpp_buff *new_buff (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 (const cpp_token *token, 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.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 (cpp_buffer *buffer, const uchar *pos, 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 = XRESIZEVEC (_cpp_line_note, buffer->notes,
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buffer->notes_cap);
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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 (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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const uchar *pbackslash = NULL;
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/* Short circuit for the common case of an un-escaped line with
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no trigraphs. The primary win here is by not writing any
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data back to memory until we have to. */
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for (;;)
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{
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c = *++s;
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if (__builtin_expect (c == '\n', false)
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|| __builtin_expect (c == '\r', false))
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{
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d = (uchar *) s;
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if (__builtin_expect (s == buffer->rlimit, false))
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goto done;
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/* DOS line ending? */
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if (__builtin_expect (c == '\r', false)
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&& s[1] == '\n')
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{
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s++;
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if (s == buffer->rlimit)
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goto done;
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}
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if (__builtin_expect (pbackslash == NULL, true))
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goto done;
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/* Check for escaped newline. */
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p = d;
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while (is_nvspace (p[-1]))
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p--;
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if (p - 1 != pbackslash)
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goto done;
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/* Have an escaped newline; process it and proceed to
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the slow path. */
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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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break;
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}
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if (__builtin_expect (c == '\\', false))
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pbackslash = s;
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else if (__builtin_expect (c == '?', false)
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&& __builtin_expect (s[1] == '?', false)
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&& _cpp_trigraph_map[s[2]])
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{
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/* Have a trigraph. We may or may not have to convert
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it. Add a line note regardless, for -Wtrigraphs. */
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add_line_note (buffer, s, s[2]);
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if (CPP_OPTION (pfile, trigraphs))
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{
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/* We do, and that means we have to switch to the
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slow path. */
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d = (uchar *) s;
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*d = _cpp_trigraph_map[s[2]];
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s += 2;
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break;
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}
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}
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}
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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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done:
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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 (cpp_reader *pfile, _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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behavior. */
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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 (cpp_reader *pfile, 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, CPP_DL_WARNING, pfile->line_table->highest_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, CPP_DL_PEDWARN, pfile->line_table->highest_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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CPP_INCREMENT_LINE (pfile, 0);
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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, CPP_DL_WARNING, pfile->line_table->highest_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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{
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cpp_error_with_line
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(pfile, CPP_DL_WARNING, pfile->line_table->highest_line, col,
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"trigraph ??%c ignored, use -trigraphs to enable",
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note->type);
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}
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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 (cpp_reader *pfile)
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{
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cpp_buffer *buffer = pfile->buffer;
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const uchar *cur = buffer->cur;
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uchar c;
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cur++;
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if (*cur == '/')
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cur++;
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for (;;)
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{
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/* People like decorating comments with '*', so check for '/'
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instead for efficiency. */
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c = *cur++;
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if (c == '/')
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{
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if (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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&& cur[0] == '*' && cur[1] != '/')
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{
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buffer->cur = cur;
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cpp_error_with_line (pfile, CPP_DL_WARNING,
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pfile->line_table->highest_line, CPP_BUF_COL (buffer),
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"\"/*\" within comment");
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}
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}
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else if (c == '\n')
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{
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unsigned int cols;
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buffer->cur = cur - 1;
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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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cols = buffer->next_line - buffer->line_base;
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CPP_INCREMENT_LINE (pfile, cols);
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cur = buffer->cur;
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}
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}
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buffer->cur = cur;
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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 (cpp_reader *pfile)
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{
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cpp_buffer *buffer = pfile->buffer;
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source_location orig_line = pfile->line_table->highest_line;
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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_table->highest_line;
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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 (cpp_reader *pfile, 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, CPP_DL_PEDWARN, pfile->line_table->highest_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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if (saw_NUL)
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cpp_error (pfile, CPP_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 (cpp_reader *pfile, const cpp_string *string)
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{
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unsigned int i;
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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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/* After parsing an identifier or other sequence, produce a warning about
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sequences not in NFC/NFKC. */
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static void
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warn_about_normalization (cpp_reader *pfile,
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const cpp_token *token,
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const struct normalize_state *s)
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{
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|
if (CPP_OPTION (pfile, warn_normalize) < NORMALIZE_STATE_RESULT (s)
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&& !pfile->state.skipping)
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{
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/* Make sure that the token is printed using UCNs, even
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|
if we'd otherwise happily print UTF-8. */
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unsigned char *buf = XNEWVEC (unsigned char, cpp_token_len (token));
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size_t sz;
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sz = cpp_spell_token (pfile, token, buf, false) - buf;
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if (NORMALIZE_STATE_RESULT (s) == normalized_C)
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cpp_error_with_line (pfile, CPP_DL_WARNING, token->src_loc, 0,
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"`%.*s' is not in NFKC", (int) sz, buf);
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else
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cpp_error_with_line (pfile, CPP_DL_WARNING, token->src_loc, 0,
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"`%.*s' is not in NFC", (int) sz, buf);
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}
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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. */
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|
static bool
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|
forms_identifier_p (cpp_reader *pfile, int first,
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|
struct normalize_state *state)
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|
{
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|
cpp_buffer *buffer = pfile->buffer;
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|
|
if (*buffer->cur == '$')
|
|
{
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|
if (!CPP_OPTION (pfile, dollars_in_ident))
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return false;
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|
buffer->cur++;
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if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping)
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|
{
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CPP_OPTION (pfile, warn_dollars) = 0;
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cpp_error (pfile, CPP_DL_PEDWARN, "'$' in identifier or number");
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}
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return true;
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}
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/* Is this a syntactically valid UCN? */
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|
if (CPP_OPTION (pfile, extended_identifiers)
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&& *buffer->cur == '\\'
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&& (buffer->cur[1] == 'u' || buffer->cur[1] == 'U'))
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|
{
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buffer->cur += 2;
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if (_cpp_valid_ucn (pfile, &buffer->cur, buffer->rlimit, 1 + !first,
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state))
|
|
return true;
|
|
buffer->cur -= 2;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Lex an identifier starting at BUFFER->CUR - 1. */
|
|
static cpp_hashnode *
|
|
lex_identifier (cpp_reader *pfile, const uchar *base, bool starts_ucn,
|
|
struct normalize_state *nst)
|
|
{
|
|
cpp_hashnode *result;
|
|
const uchar *cur;
|
|
unsigned int len;
|
|
unsigned int hash = HT_HASHSTEP (0, *base);
|
|
|
|
cur = pfile->buffer->cur;
|
|
if (! starts_ucn)
|
|
while (ISIDNUM (*cur))
|
|
{
|
|
hash = HT_HASHSTEP (hash, *cur);
|
|
cur++;
|
|
}
|
|
pfile->buffer->cur = cur;
|
|
if (starts_ucn || forms_identifier_p (pfile, false, nst))
|
|
{
|
|
/* Slower version for identifiers containing UCNs (or $). */
|
|
do {
|
|
while (ISIDNUM (*pfile->buffer->cur))
|
|
{
|
|
pfile->buffer->cur++;
|
|
NORMALIZE_STATE_UPDATE_IDNUM (nst);
|
|
}
|
|
} while (forms_identifier_p (pfile, false, nst));
|
|
result = _cpp_interpret_identifier (pfile, base,
|
|
pfile->buffer->cur - base);
|
|
}
|
|
else
|
|
{
|
|
len = cur - base;
|
|
hash = HT_HASHFINISH (hash, len);
|
|
|
|
result = CPP_HASHNODE (ht_lookup_with_hash (pfile->hash_table,
|
|
base, len, hash, 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, CPP_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, CPP_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 (cpp_reader *pfile, cpp_string *number,
|
|
struct normalize_state *nst)
|
|
{
|
|
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++;
|
|
NORMALIZE_STATE_UPDATE_IDNUM (nst);
|
|
}
|
|
|
|
pfile->buffer->cur = cur;
|
|
}
|
|
while (forms_identifier_p (pfile, false, nst));
|
|
|
|
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 (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', 'u' or 'U'. It returns the type
|
|
of the literal, or CPP_OTHER if it was not properly terminated, or
|
|
CPP_LESS for an unterminated header name which must be relexed as
|
|
normal tokens.
|
|
|
|
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 (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 == 'u' || terminator == 'U')
|
|
terminator = *cur++;
|
|
if (terminator == '\"')
|
|
type = (*base == 'L' ? CPP_WSTRING :
|
|
*base == 'U' ? CPP_STRING32 :
|
|
*base == 'u' ? CPP_STRING16 : CPP_STRING);
|
|
else if (terminator == '\'')
|
|
type = (*base == 'L' ? CPP_WCHAR :
|
|
*base == 'U' ? CPP_CHAR32 :
|
|
*base == 'u' ? CPP_CHAR16 : 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--;
|
|
/* Unmatched quotes always yield undefined behavior, but
|
|
greedy lexing means that what appears to be an unterminated
|
|
header name may actually be a legitimate sequence of tokens. */
|
|
if (terminator == '>')
|
|
{
|
|
token->type = CPP_LESS;
|
|
return;
|
|
}
|
|
type = CPP_OTHER;
|
|
break;
|
|
}
|
|
else if (c == '\0')
|
|
saw_NUL = true;
|
|
}
|
|
|
|
if (saw_NUL && !pfile->state.skipping)
|
|
cpp_error (pfile, CPP_DL_WARNING,
|
|
"null character(s) preserved in literal");
|
|
|
|
if (type == CPP_OTHER && CPP_OPTION (pfile, lang) != CLK_ASM)
|
|
cpp_error (pfile, CPP_DL_PEDWARN, "missing terminating %c character",
|
|
(int) terminator);
|
|
|
|
pfile->buffer->cur = cur;
|
|
create_literal (pfile, token, base, cur - base, type);
|
|
}
|
|
|
|
/* Return the comment table. The client may not make any assumption
|
|
about the ordering of the table. */
|
|
cpp_comment_table *
|
|
cpp_get_comments (cpp_reader *pfile)
|
|
{
|
|
return &pfile->comments;
|
|
}
|
|
|
|
/* Append a comment to the end of the comment table. */
|
|
static void
|
|
store_comment (cpp_reader *pfile, cpp_token *token)
|
|
{
|
|
int len;
|
|
|
|
if (pfile->comments.allocated == 0)
|
|
{
|
|
pfile->comments.allocated = 256;
|
|
pfile->comments.entries = (cpp_comment *) xmalloc
|
|
(pfile->comments.allocated * sizeof (cpp_comment));
|
|
}
|
|
|
|
if (pfile->comments.count == pfile->comments.allocated)
|
|
{
|
|
pfile->comments.allocated *= 2;
|
|
pfile->comments.entries = (cpp_comment *) xrealloc
|
|
(pfile->comments.entries,
|
|
pfile->comments.allocated * sizeof (cpp_comment));
|
|
}
|
|
|
|
len = token->val.str.len;
|
|
|
|
/* Copy comment. Note, token may not be NULL terminated. */
|
|
pfile->comments.entries[pfile->comments.count].comment =
|
|
(char *) xmalloc (sizeof (char) * (len + 1));
|
|
memcpy (pfile->comments.entries[pfile->comments.count].comment,
|
|
token->val.str.text, len);
|
|
pfile->comments.entries[pfile->comments.count].comment[len] = '\0';
|
|
|
|
/* Set source location. */
|
|
pfile->comments.entries[pfile->comments.count].sloc = token->src_loc;
|
|
|
|
/* Increment the count of entries in the comment table. */
|
|
pfile->comments.count++;
|
|
}
|
|
|
|
/* The stored comment includes the comment start and any terminator. */
|
|
static void
|
|
save_comment (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] = '/';
|
|
}
|
|
|
|
/* Finally store this comment for use by clients of libcpp. */
|
|
store_comment (pfile, token);
|
|
}
|
|
|
|
/* Allocate COUNT tokens for RUN. */
|
|
void
|
|
_cpp_init_tokenrun (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 (tokenrun *run)
|
|
{
|
|
if (run->next == NULL)
|
|
{
|
|
run->next = XNEW (tokenrun);
|
|
run->next->prev = run;
|
|
_cpp_init_tokenrun (run->next, 250);
|
|
}
|
|
|
|
return run->next;
|
|
}
|
|
|
|
/* Look ahead in the input stream. */
|
|
const cpp_token *
|
|
cpp_peek_token (cpp_reader *pfile, int index)
|
|
{
|
|
cpp_context *context = pfile->context;
|
|
const cpp_token *peektok;
|
|
int count;
|
|
|
|
/* First, scan through any pending cpp_context objects. */
|
|
while (context->prev)
|
|
{
|
|
ptrdiff_t sz = (context->direct_p
|
|
? LAST (context).token - FIRST (context).token
|
|
: LAST (context).ptoken - FIRST (context).ptoken);
|
|
|
|
if (index < (int) sz)
|
|
return (context->direct_p
|
|
? FIRST (context).token + index
|
|
: *(FIRST (context).ptoken + index));
|
|
|
|
index -= (int) sz;
|
|
context = context->prev;
|
|
}
|
|
|
|
/* We will have to read some new tokens after all (and do so
|
|
without invalidating preceding tokens). */
|
|
count = index;
|
|
pfile->keep_tokens++;
|
|
|
|
do
|
|
{
|
|
peektok = _cpp_lex_token (pfile);
|
|
if (peektok->type == CPP_EOF)
|
|
return peektok;
|
|
}
|
|
while (index--);
|
|
|
|
_cpp_backup_tokens_direct (pfile, count + 1);
|
|
pfile->keep_tokens--;
|
|
|
|
return peektok;
|
|
}
|
|
|
|
/* 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 (cpp_reader *pfile)
|
|
{
|
|
cpp_token *old, *result;
|
|
ptrdiff_t sz = pfile->cur_run->limit - pfile->cur_token;
|
|
ptrdiff_t la = (ptrdiff_t) pfile->lookaheads;
|
|
|
|
old = pfile->cur_token - 1;
|
|
/* Any pre-existing lookaheads must not be clobbered. */
|
|
if (la)
|
|
{
|
|
if (sz <= la)
|
|
{
|
|
tokenrun *next = next_tokenrun (pfile->cur_run);
|
|
|
|
if (sz < la)
|
|
memmove (next->base + 1, next->base,
|
|
(la - sz) * sizeof (cpp_token));
|
|
|
|
next->base[0] = pfile->cur_run->limit[-1];
|
|
}
|
|
|
|
if (sz > 1)
|
|
memmove (pfile->cur_token + 1, pfile->cur_token,
|
|
MIN (la, sz - 1) * sizeof (cpp_token));
|
|
}
|
|
|
|
if (!sz && 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->src_loc = old->src_loc;
|
|
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 (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;
|
|
}
|
|
/* We assume that the current token is somewhere in the current
|
|
run. */
|
|
if (pfile->cur_token < pfile->cur_run->base
|
|
|| pfile->cur_token >= pfile->cur_run->limit)
|
|
abort ();
|
|
|
|
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)
|
|
{
|
|
if (_cpp_handle_directive (pfile, result->flags & PREV_WHITE))
|
|
{
|
|
if (pfile->directive_result.type == CPP_PADDING)
|
|
continue;
|
|
result = &pfile->directive_result;
|
|
}
|
|
}
|
|
else if (pfile->state.in_deferred_pragma)
|
|
result = &pfile->directive_result;
|
|
|
|
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 || pfile->state.in_deferred_pragma)
|
|
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 optimization 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 (cpp_reader *pfile)
|
|
{
|
|
int return_at_eof;
|
|
|
|
/* 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)
|
|
{
|
|
/* Clip to buffer size. */
|
|
buffer->next_line = buffer->rlimit;
|
|
}
|
|
|
|
return_at_eof = buffer->return_at_eof;
|
|
_cpp_pop_buffer (pfile);
|
|
if (pfile->buffer == NULL || return_at_eof)
|
|
return false;
|
|
}
|
|
}
|
|
|
|
#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
|
|
optimization, 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 (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;
|
|
buffer = pfile->buffer;
|
|
if (buffer->need_line)
|
|
{
|
|
if (pfile->state.in_deferred_pragma)
|
|
{
|
|
result->type = CPP_PRAGMA_EOL;
|
|
pfile->state.in_deferred_pragma = false;
|
|
if (!pfile->state.pragma_allow_expansion)
|
|
pfile->state.prevent_expansion--;
|
|
return result;
|
|
}
|
|
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->src_loc = pfile->line_table->highest_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->src_loc = pfile->line_table->highest_line;
|
|
|
|
skipped_white:
|
|
if (buffer->cur >= buffer->notes[buffer->cur_note].pos
|
|
&& !pfile->overlaid_buffer)
|
|
{
|
|
_cpp_process_line_notes (pfile, false);
|
|
result->src_loc = pfile->line_table->highest_line;
|
|
}
|
|
c = *buffer->cur++;
|
|
|
|
LINEMAP_POSITION_FOR_COLUMN (result->src_loc, pfile->line_table,
|
|
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':
|
|
if (buffer->cur < buffer->rlimit)
|
|
CPP_INCREMENT_LINE (pfile, 0);
|
|
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':
|
|
{
|
|
struct normalize_state nst = INITIAL_NORMALIZE_STATE;
|
|
result->type = CPP_NUMBER;
|
|
lex_number (pfile, &result->val.str, &nst);
|
|
warn_about_normalization (pfile, result, &nst);
|
|
break;
|
|
}
|
|
|
|
case 'L':
|
|
case 'u':
|
|
case 'U':
|
|
/* 'L', 'u' or 'U' may introduce wide characters or strings. */
|
|
if (c == 'L' || CPP_OPTION (pfile, uliterals))
|
|
{
|
|
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 '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 'V': case 'W': case 'X':
|
|
case 'Y': case 'Z':
|
|
result->type = CPP_NAME;
|
|
{
|
|
struct normalize_state nst = INITIAL_NORMALIZE_STATE;
|
|
result->val.node.node = lex_identifier (pfile, buffer->cur - 1, false,
|
|
&nst);
|
|
warn_about_normalization (pfile, result, &nst);
|
|
}
|
|
|
|
/* Convert named operators to their proper types. */
|
|
if (result->val.node.node->flags & NODE_OPERATOR)
|
|
{
|
|
result->flags |= NAMED_OP;
|
|
result->type = (enum cpp_ttype) result->val.node.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, CPP_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, CPP_DL_PEDWARN,
|
|
"C++ style comments are not allowed in ISO C90");
|
|
cpp_error (pfile, CPP_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, CPP_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);
|
|
if (result->type != CPP_LESS)
|
|
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 (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);
|
|
}
|
|
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, result->val.token_no = 0;
|
|
}
|
|
else if (*buffer->cur == '>')
|
|
{
|
|
buffer->cur++;
|
|
result->flags |= DIGRAPH;
|
|
result->type = CPP_CLOSE_BRACE;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '.':
|
|
result->type = CPP_DOT;
|
|
if (ISDIGIT (*buffer->cur))
|
|
{
|
|
struct normalize_state nst = INITIAL_NORMALIZE_STATE;
|
|
result->type = CPP_NUMBER;
|
|
lex_number (pfile, &result->val.str, &nst);
|
|
warn_about_normalization (pfile, result, &nst);
|
|
}
|
|
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); result->val.token_no = 0; 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;
|
|
struct normalize_state nst = INITIAL_NORMALIZE_STATE;
|
|
|
|
if (forms_identifier_p (pfile, true, &nst))
|
|
{
|
|
result->type = CPP_NAME;
|
|
result->val.node.node = lex_identifier (pfile, base, true, &nst);
|
|
warn_about_normalization (pfile, result, &nst);
|
|
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 (const cpp_token *token)
|
|
{
|
|
unsigned int len;
|
|
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
default: len = 6; break;
|
|
case SPELL_LITERAL: len = token->val.str.len; break;
|
|
case SPELL_IDENT: len = NODE_LEN (token->val.node.node) * 10; break;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/* Parse UTF-8 out of NAMEP and place a \U escape in BUFFER.
|
|
Return the number of bytes read out of NAME. (There are always
|
|
10 bytes written to BUFFER.) */
|
|
|
|
static size_t
|
|
utf8_to_ucn (unsigned char *buffer, const unsigned char *name)
|
|
{
|
|
int j;
|
|
int ucn_len = 0;
|
|
int ucn_len_c;
|
|
unsigned t;
|
|
unsigned long utf32;
|
|
|
|
/* Compute the length of the UTF-8 sequence. */
|
|
for (t = *name; t & 0x80; t <<= 1)
|
|
ucn_len++;
|
|
|
|
utf32 = *name & (0x7F >> ucn_len);
|
|
for (ucn_len_c = 1; ucn_len_c < ucn_len; ucn_len_c++)
|
|
{
|
|
utf32 = (utf32 << 6) | (*++name & 0x3F);
|
|
|
|
/* Ill-formed UTF-8. */
|
|
if ((*name & ~0x3F) != 0x80)
|
|
abort ();
|
|
}
|
|
|
|
*buffer++ = '\\';
|
|
*buffer++ = 'U';
|
|
for (j = 7; j >= 0; j--)
|
|
*buffer++ = "0123456789abcdef"[(utf32 >> (4 * j)) & 0xF];
|
|
return ucn_len;
|
|
}
|
|
|
|
/* Given a token TYPE corresponding to a digraph, return a pointer to
|
|
the spelling of the digraph. */
|
|
static const unsigned char *
|
|
cpp_digraph2name (enum cpp_ttype type)
|
|
{
|
|
return digraph_spellings[(int) type - (int) CPP_FIRST_DIGRAPH];
|
|
}
|
|
|
|
/* 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.
|
|
FORSTRING is true if this is to be the spelling after translation
|
|
phase 1 (this is different for UCNs).
|
|
FIXME: Would be nice if we didn't need the PFILE argument. */
|
|
unsigned char *
|
|
cpp_spell_token (cpp_reader *pfile, const cpp_token *token,
|
|
unsigned char *buffer, bool forstring)
|
|
{
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
case SPELL_OPERATOR:
|
|
{
|
|
const unsigned char *spelling;
|
|
unsigned char c;
|
|
|
|
if (token->flags & DIGRAPH)
|
|
spelling = cpp_digraph2name (token->type);
|
|
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:
|
|
if (forstring)
|
|
{
|
|
memcpy (buffer, NODE_NAME (token->val.node.node),
|
|
NODE_LEN (token->val.node.node));
|
|
buffer += NODE_LEN (token->val.node.node);
|
|
}
|
|
else
|
|
{
|
|
size_t i;
|
|
const unsigned char * name = NODE_NAME (token->val.node.node);
|
|
|
|
for (i = 0; i < NODE_LEN (token->val.node.node); i++)
|
|
if (name[i] & ~0x7F)
|
|
{
|
|
i += utf8_to_ucn (buffer, name + i) - 1;
|
|
buffer += 10;
|
|
}
|
|
else
|
|
*buffer++ = NODE_NAME (token->val.node.node)[i];
|
|
}
|
|
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, CPP_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 (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, false);
|
|
end[0] = '\0';
|
|
|
|
return start;
|
|
}
|
|
|
|
/* Returns a pointer to a string which spells the token defined by
|
|
TYPE and FLAGS. Used by C front ends, which really should move to
|
|
using cpp_token_as_text. */
|
|
const char *
|
|
cpp_type2name (enum cpp_ttype type, unsigned char flags)
|
|
{
|
|
if (flags & DIGRAPH)
|
|
return (const char *) cpp_digraph2name (type);
|
|
else if (flags & NAMED_OP)
|
|
return cpp_named_operator2name (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 (const cpp_token *token, FILE *fp)
|
|
{
|
|
switch (TOKEN_SPELL (token))
|
|
{
|
|
case SPELL_OPERATOR:
|
|
{
|
|
const unsigned char *spelling;
|
|
int c;
|
|
|
|
if (token->flags & DIGRAPH)
|
|
spelling = cpp_digraph2name (token->type);
|
|
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:
|
|
{
|
|
size_t i;
|
|
const unsigned char * name = NODE_NAME (token->val.node.node);
|
|
|
|
for (i = 0; i < NODE_LEN (token->val.node.node); i++)
|
|
if (name[i] & ~0x7F)
|
|
{
|
|
unsigned char buffer[10];
|
|
i += utf8_to_ucn (buffer, name + i) - 1;
|
|
fwrite (buffer, 1, 10, fp);
|
|
}
|
|
else
|
|
fputc (NODE_NAME (token->val.node.node)[i], 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 (const cpp_token *a, const cpp_token *b)
|
|
{
|
|
if (a->type == b->type && a->flags == b->flags)
|
|
switch (TOKEN_SPELL (a))
|
|
{
|
|
default: /* Keep compiler happy. */
|
|
case SPELL_OPERATOR:
|
|
/* token_no is used to track where multiple consecutive ##
|
|
tokens were originally located. */
|
|
return (a->type != CPP_PASTE || a->val.token_no == b->val.token_no);
|
|
case SPELL_NONE:
|
|
return (a->type != CPP_MACRO_ARG
|
|
|| a->val.macro_arg.arg_no == b->val.macro_arg.arg_no);
|
|
case SPELL_IDENT:
|
|
return a->val.node.node == b->val.node.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 (cpp_reader *pfile, const cpp_token *token1,
|
|
const cpp_token *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 == '>';
|
|
case CPP_LESS: return 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 (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);
|
|
}
|
|
|
|
/* Return a string representation of all the remaining tokens on the
|
|
current line. The result is allocated using xmalloc and must be
|
|
freed by the caller. */
|
|
unsigned char *
|
|
cpp_output_line_to_string (cpp_reader *pfile, const unsigned char *dir_name)
|
|
{
|
|
const cpp_token *token;
|
|
unsigned int out = dir_name ? ustrlen (dir_name) : 0;
|
|
unsigned int alloced = 120 + out;
|
|
unsigned char *result = (unsigned char *) xmalloc (alloced);
|
|
|
|
/* If DIR_NAME is empty, there are no initial contents. */
|
|
if (dir_name)
|
|
{
|
|
sprintf ((char *) result, "#%s ", dir_name);
|
|
out += 2;
|
|
}
|
|
|
|
token = cpp_get_token (pfile);
|
|
while (token->type != CPP_EOF)
|
|
{
|
|
unsigned char *last;
|
|
/* Include room for a possible space and the terminating nul. */
|
|
unsigned int len = cpp_token_len (token) + 2;
|
|
|
|
if (out + len > alloced)
|
|
{
|
|
alloced *= 2;
|
|
if (out + len > alloced)
|
|
alloced = out + len;
|
|
result = (unsigned char *) xrealloc (result, alloced);
|
|
}
|
|
|
|
last = cpp_spell_token (pfile, token, &result[out], 0);
|
|
out = last - result;
|
|
|
|
token = cpp_get_token (pfile);
|
|
if (token->flags & PREV_WHITE)
|
|
result[out++] = ' ';
|
|
}
|
|
|
|
result[out] = '\0';
|
|
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 (size_t len)
|
|
{
|
|
_cpp_buff *result;
|
|
unsigned char *base;
|
|
|
|
if (len < MIN_BUFF_SIZE)
|
|
len = MIN_BUFF_SIZE;
|
|
len = CPP_ALIGN (len);
|
|
|
|
base = XNEWVEC (unsigned char, 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 (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 (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 (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 (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 (_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 (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 (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;
|
|
}
|
|
|
|
/* Say which field of TOK is in use. */
|
|
|
|
enum cpp_token_fld_kind
|
|
cpp_token_val_index (cpp_token *tok)
|
|
{
|
|
switch (TOKEN_SPELL (tok))
|
|
{
|
|
case SPELL_IDENT:
|
|
return CPP_TOKEN_FLD_NODE;
|
|
case SPELL_LITERAL:
|
|
return CPP_TOKEN_FLD_STR;
|
|
case SPELL_OPERATOR:
|
|
if (tok->type == CPP_PASTE)
|
|
return CPP_TOKEN_FLD_TOKEN_NO;
|
|
else
|
|
return CPP_TOKEN_FLD_NONE;
|
|
case SPELL_NONE:
|
|
if (tok->type == CPP_MACRO_ARG)
|
|
return CPP_TOKEN_FLD_ARG_NO;
|
|
else if (tok->type == CPP_PADDING)
|
|
return CPP_TOKEN_FLD_SOURCE;
|
|
else if (tok->type == CPP_PRAGMA)
|
|
return CPP_TOKEN_FLD_PRAGMA;
|
|
/* else fall through */
|
|
default:
|
|
return CPP_TOKEN_FLD_NONE;
|
|
}
|
|
}
|