/* CPP Library - lexical analysis.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
Contributed by Per Bothner, 1994-95.
Based on CCCP program by Paul Rubin, June 1986
Adapted to ANSI C, Richard Stallman, Jan 1987
Broken out to separate file, Zack Weinberg, Mar 2000
- Single-pass line tokenization by Neil Booth, April 2000
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/* This lexer works with a single pass of the file. Recently I
- re-wrote it to minimize the places where we step backwards in the
- input stream, to make future changes to support multi-byte
- character sets fairly straight-forward.
-
- There is now only one routine where we do step backwards:
- skip_escaped_newlines. This routine could probably also be changed
- so that it doesn't need to step back. One possibility is to use a
- trick similar to that used in lex_period and lex_percent. Two
- extra characters might be needed, but skip_escaped_newlines itself
- would probably be the only place that needs to be aware of that,
- and changes to the remaining routines would probably only be needed
- if they process a backslash. */
-
#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "cpphash.h"
-/* MULTIBYTE_CHARS support only works for native compilers.
- ??? Ideally what we want is to model widechar support after
- the current floating point support. */
-#ifdef CROSS_COMPILE
-#undef MULTIBYTE_CHARS
-#endif
-
-#ifdef MULTIBYTE_CHARS
-#include "mbchar.h"
-#include <locale.h>
-#endif
-
-/* Tokens with SPELL_STRING store their spelling in the token list,
- and it's length in the token->val.name.len. */
enum spell_type
{
SPELL_OPERATOR = 0,
- SPELL_CHAR,
SPELL_IDENT,
- SPELL_STRING,
+ SPELL_LITERAL,
SPELL_NONE
};
const unsigned char *name;
};
-const unsigned char *digraph_spellings [] = {U"%:", U"%:%:", U"<:",
- U":>", U"<%", U"%>"};
+static const unsigned char *const digraph_spellings[] =
+{ U"%:", U"%:%:", U"<:", U":>", U"<%", U"%>" };
#define OP(e, s) { SPELL_OPERATOR, U s },
-#define TK(e, s) { s, U STRINGX (e) },
-const struct token_spelling token_spellings [N_TTYPES] = {TTYPE_TABLE };
+#define TK(e, s) { s, U #e },
+static const struct token_spelling token_spellings[N_TTYPES] = { TTYPE_TABLE };
#undef OP
#undef TK
#define TOKEN_SPELL(token) (token_spellings[(token)->type].category)
#define TOKEN_NAME(token) (token_spellings[(token)->type].name)
-static cppchar_t handle_newline PARAMS ((cpp_reader *, cppchar_t));
-static cppchar_t skip_escaped_newlines PARAMS ((cpp_reader *, cppchar_t));
-static cppchar_t get_effective_char PARAMS ((cpp_reader *));
-
-static int skip_block_comment PARAMS ((cpp_reader *));
-static int skip_line_comment PARAMS ((cpp_reader *));
-static void adjust_column PARAMS ((cpp_reader *));
-static void skip_whitespace PARAMS ((cpp_reader *, cppchar_t));
-static cpp_hashnode *parse_identifier PARAMS ((cpp_reader *));
-static cpp_hashnode *parse_identifier_slow PARAMS ((cpp_reader *,
- const U_CHAR *));
-static void parse_number PARAMS ((cpp_reader *, cpp_string *, cppchar_t, int));
-static int unescaped_terminator_p PARAMS ((cpp_reader *, const U_CHAR *));
-static void parse_string PARAMS ((cpp_reader *, cpp_token *, cppchar_t));
-static void unterminated PARAMS ((cpp_reader *, int));
-static int trigraph_ok PARAMS ((cpp_reader *, cppchar_t));
-static void save_comment PARAMS ((cpp_reader *, cpp_token *, const U_CHAR *));
-static void lex_percent PARAMS ((cpp_reader *, cpp_token *));
-static void lex_dot PARAMS ((cpp_reader *, cpp_token *));
-static int name_p PARAMS ((cpp_reader *, const cpp_string *));
-static int maybe_read_ucs PARAMS ((cpp_reader *, const unsigned char **,
- const unsigned char *, unsigned int *));
-static tokenrun *next_tokenrun PARAMS ((tokenrun *));
-
-static cpp_chunk *new_chunk PARAMS ((unsigned int));
-static int chunk_suitable PARAMS ((cpp_chunk *, unsigned int));
-static unsigned int hex_digit_value PARAMS ((unsigned int));
-static _cpp_buff *new_buff PARAMS ((unsigned int));
+static void add_line_note (cpp_buffer *, const uchar *, unsigned int);
+static int skip_line_comment (cpp_reader *);
+static void skip_whitespace (cpp_reader *, cppchar_t);
+static cpp_hashnode *lex_identifier (cpp_reader *, const uchar *);
+static void lex_number (cpp_reader *, cpp_string *);
+static bool forms_identifier_p (cpp_reader *, int);
+static void lex_string (cpp_reader *, cpp_token *, const uchar *);
+static void save_comment (cpp_reader *, cpp_token *, const uchar *, cppchar_t);
+static void create_literal (cpp_reader *, cpp_token *, const uchar *,
+ unsigned int, enum cpp_ttype);
+static bool warn_in_comment (cpp_reader *, _cpp_line_note *);
+static int name_p (cpp_reader *, const cpp_string *);
+static tokenrun *next_tokenrun (tokenrun *);
+
+static _cpp_buff *new_buff (size_t);
+
/* Utility routine:
Compares, the token TOKEN to the NUL-terminated string STRING.
TOKEN must be a CPP_NAME. Returns 1 for equal, 0 for unequal. */
-
int
-cpp_ideq (token, string)
- const cpp_token *token;
- const char *string;
+cpp_ideq (const cpp_token *token, const char *string)
{
if (token->type != CPP_NAME)
return 0;
- return !ustrcmp (NODE_NAME (token->val.node), (const U_CHAR *) string);
+ return !ustrcmp (NODE_NAME (token->val.node), (const uchar *) string);
}
-/* Call when meeting a newline. Returns the character after the newline
- (or carriage-return newline combination), or EOF. */
-static cppchar_t
-handle_newline (pfile, newline_char)
- cpp_reader *pfile;
- cppchar_t newline_char;
+/* Record a note TYPE at byte POS into the current cleaned logical
+ line. */
+static void
+add_line_note (cpp_buffer *buffer, const uchar *pos, unsigned int type)
{
- cpp_buffer *buffer;
- cppchar_t next = EOF;
-
- pfile->line++;
- buffer = pfile->buffer;
- buffer->col_adjust = 0;
- buffer->line_base = buffer->cur;
-
- /* Handle CR-LF and LF-CR combinations, get the next character. */
- if (buffer->cur < buffer->rlimit)
+ if (buffer->notes_used == buffer->notes_cap)
{
- next = *buffer->cur++;
- if (next + newline_char == '\r' + '\n')
- {
- buffer->line_base = buffer->cur;
- if (buffer->cur < buffer->rlimit)
- next = *buffer->cur++;
- else
- next = EOF;
- }
+ buffer->notes_cap = buffer->notes_cap * 2 + 200;
+ buffer->notes = xrealloc (buffer->notes,
+ buffer->notes_cap * sizeof (_cpp_line_note));
}
- buffer->read_ahead = next;
- return next;
+ buffer->notes[buffer->notes_used].pos = pos;
+ buffer->notes[buffer->notes_used].type = type;
+ buffer->notes_used++;
}
-/* Subroutine of skip_escaped_newlines; called when a trigraph is
- encountered. It warns if necessary, and returns true if the
- trigraph should be honoured. FROM_CHAR is the third character of a
- trigraph, and presumed to be the previous character for position
- reporting. */
-static int
-trigraph_ok (pfile, from_char)
- cpp_reader *pfile;
- cppchar_t from_char;
+/* Returns with a logical line that contains no escaped newlines or
+ trigraphs. This is a time-critical inner loop. */
+void
+_cpp_clean_line (cpp_reader *pfile)
{
- int accept = CPP_OPTION (pfile, trigraphs);
-
- /* Don't warn about trigraphs in comments. */
- if (CPP_OPTION (pfile, warn_trigraphs) && !pfile->state.lexing_comment)
- {
- cpp_buffer *buffer = pfile->buffer;
-
- if (accept)
- cpp_warning_with_line (pfile, pfile->line, CPP_BUF_COL (buffer) - 2,
- "trigraph ??%c converted to %c",
- (int) from_char,
- (int) _cpp_trigraph_map[from_char]);
- else if (buffer->cur != buffer->last_Wtrigraphs)
- {
- buffer->last_Wtrigraphs = buffer->cur;
- cpp_warning_with_line (pfile, pfile->line,
- CPP_BUF_COL (buffer) - 2,
- "trigraph ??%c ignored", (int) from_char);
- }
- }
-
- return accept;
-}
+ cpp_buffer *buffer;
+ const uchar *s;
+ uchar c, *d, *p;
-/* Assumes local variables buffer and result. */
-#define ACCEPT_CHAR(t) \
- do { result->type = t; buffer->read_ahead = EOF; } while (0)
-
-/* When we move to multibyte character sets, add to these something
- that saves and restores the state of the multibyte conversion
- library. This probably involves saving and restoring a "cookie".
- In the case of glibc it is an 8-byte structure, so is not a high
- overhead operation. In any case, it's out of the fast path. */
-#define SAVE_STATE() do { saved_cur = buffer->cur; } while (0)
-#define RESTORE_STATE() do { buffer->cur = saved_cur; } while (0)
-
-/* Skips any escaped newlines introduced by NEXT, which is either a
- '?' or a '\\'. Returns the next character, which will also have
- been placed in buffer->read_ahead. This routine performs
- preprocessing stages 1 and 2 of the ISO C standard. */
-static cppchar_t
-skip_escaped_newlines (pfile, next)
- cpp_reader *pfile;
- cppchar_t next;
-{
- cpp_buffer *buffer = pfile->buffer;
+ buffer = pfile->buffer;
+ buffer->cur_note = buffer->notes_used = 0;
+ buffer->cur = buffer->line_base = buffer->next_line;
+ buffer->need_line = false;
+ s = buffer->next_line - 1;
- /* Only do this if we apply stages 1 and 2. */
if (!buffer->from_stage3)
{
- cppchar_t next1;
- const unsigned char *saved_cur;
- int space;
+ d = (uchar *) s;
- do
+ for (;;)
{
- if (buffer->cur == buffer->rlimit)
- break;
-
- SAVE_STATE ();
- if (next == '?')
- {
- next1 = *buffer->cur++;
- if (next1 != '?' || buffer->cur == buffer->rlimit)
- {
- RESTORE_STATE ();
- break;
- }
-
- next1 = *buffer->cur++;
- if (!_cpp_trigraph_map[next1]
- || !trigraph_ok (pfile, next1))
- {
- RESTORE_STATE ();
- break;
- }
+ c = *++s;
+ *++d = c;
- /* We have a full trigraph here. */
- next = _cpp_trigraph_map[next1];
- if (next != '\\' || buffer->cur == buffer->rlimit)
+ if (c == '\n' || c == '\r')
+ {
+ /* Handle DOS line endings. */
+ if (c == '\r' && s != buffer->rlimit && s[1] == '\n')
+ s++;
+ if (s == buffer->rlimit)
break;
- SAVE_STATE ();
- }
- /* We have a backslash, and room for at least one more character. */
- space = 0;
- do
- {
- next1 = *buffer->cur++;
- if (!is_nvspace (next1))
+ /* Escaped? */
+ p = d;
+ while (p != buffer->next_line && is_nvspace (p[-1]))
+ p--;
+ if (p == buffer->next_line || p[-1] != '\\')
break;
- space = 1;
- }
- while (buffer->cur < buffer->rlimit);
- if (!is_vspace (next1))
+ add_line_note (buffer, p - 1, p != d ? ' ': '\\');
+ d = p - 2;
+ buffer->next_line = p - 1;
+ }
+ else if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]])
{
- RESTORE_STATE ();
- break;
+ /* Add a note regardless, for the benefit of -Wtrigraphs. */
+ add_line_note (buffer, d, s[2]);
+ if (CPP_OPTION (pfile, trigraphs))
+ {
+ *d = _cpp_trigraph_map[s[2]];
+ s += 2;
+ }
}
-
- if (space && !pfile->state.lexing_comment)
- cpp_warning (pfile, "backslash and newline separated by space");
-
- next = handle_newline (pfile, next1);
- if (next == EOF)
- cpp_pedwarn (pfile, "backslash-newline at end of file");
}
- while (next == '\\' || next == '?');
+ }
+ else
+ {
+ do
+ s++;
+ while (*s != '\n' && *s != '\r');
+ d = (uchar *) s;
+
+ /* Handle DOS line endings. */
+ if (*s == '\r' && s != buffer->rlimit && s[1] == '\n')
+ s++;
}
- buffer->read_ahead = next;
- return next;
+ *d = '\n';
+ /* A sentinel note that should never be processed. */
+ add_line_note (buffer, d + 1, '\n');
+ buffer->next_line = s + 1;
}
-/* Obtain the next character, after trigraph conversion and skipping
- an arbitrary string of escaped newlines. The common case of no
- trigraphs or escaped newlines falls through quickly. */
-static cppchar_t
-get_effective_char (pfile)
- cpp_reader *pfile;
+/* Return true if the trigraph indicated by NOTE should be warned
+ about in a comment. */
+static bool
+warn_in_comment (cpp_reader *pfile, _cpp_line_note *note)
+{
+ const uchar *p;
+
+ /* Within comments we don't warn about trigraphs, unless the
+ trigraph forms an escaped newline, as that may change
+ behavior. */
+ if (note->type != '/')
+ return false;
+
+ /* If -trigraphs, then this was an escaped newline iff the next note
+ is coincident. */
+ if (CPP_OPTION (pfile, trigraphs))
+ return note[1].pos == note->pos;
+
+ /* Otherwise, see if this forms an escaped newline. */
+ p = note->pos + 3;
+ while (is_nvspace (*p))
+ p++;
+
+ /* There might have been escaped newlines between the trigraph and the
+ newline we found. Hence the position test. */
+ return (*p == '\n' && p < note[1].pos);
+}
+
+/* Process the notes created by add_line_note as far as the current
+ location. */
+void
+_cpp_process_line_notes (cpp_reader *pfile, int in_comment)
{
cpp_buffer *buffer = pfile->buffer;
- cppchar_t next = EOF;
- if (buffer->cur < buffer->rlimit)
+ for (;;)
{
- next = *buffer->cur++;
-
- /* '?' can introduce trigraphs (and therefore backslash); '\\'
- can introduce escaped newlines, which we want to skip, or
- UCNs, which, depending upon lexer state, we will handle in
- the future. */
- if (next == '?' || next == '\\')
- next = skip_escaped_newlines (pfile, next);
- }
+ _cpp_line_note *note = &buffer->notes[buffer->cur_note];
+ unsigned int col;
+
+ if (note->pos > buffer->cur)
+ break;
+
+ buffer->cur_note++;
+ col = CPP_BUF_COLUMN (buffer, note->pos + 1);
+
+ if (note->type == '\\' || note->type == ' ')
+ {
+ if (note->type == ' ' && !in_comment)
+ cpp_error_with_line (pfile, DL_WARNING, pfile->line, col,
+ "backslash and newline separated by space");
+
+ if (buffer->next_line > buffer->rlimit)
+ {
+ cpp_error_with_line (pfile, DL_PEDWARN, pfile->line, col,
+ "backslash-newline at end of file");
+ /* Prevent "no newline at end of file" warning. */
+ buffer->next_line = buffer->rlimit;
+ }
- buffer->read_ahead = next;
- return next;
+ buffer->line_base = note->pos;
+ pfile->line++;
+ }
+ else if (_cpp_trigraph_map[note->type])
+ {
+ if (CPP_OPTION (pfile, warn_trigraphs)
+ && (!in_comment || warn_in_comment (pfile, note)))
+ {
+ if (CPP_OPTION (pfile, trigraphs))
+ cpp_error_with_line (pfile, DL_WARNING, pfile->line, col,
+ "trigraph ??%c converted to %c",
+ note->type,
+ (int) _cpp_trigraph_map[note->type]);
+ else
+ {
+ cpp_error_with_line
+ (pfile, DL_WARNING, pfile->line, col,
+ "trigraph ??%c ignored, use -trigraphs to enable",
+ note->type);
+ }
+ }
+ }
+ else
+ abort ();
+ }
}
/* Skip a C-style block comment. We find the end of the comment by
seeing if an asterisk is before every '/' we encounter. Returns
- non-zero if comment terminated by EOF, zero otherwise. */
-static int
-skip_block_comment (pfile)
- cpp_reader *pfile;
+ nonzero if comment terminated by EOF, zero otherwise.
+
+ Buffer->cur points to the initial asterisk of the comment. */
+bool
+_cpp_skip_block_comment (cpp_reader *pfile)
{
cpp_buffer *buffer = pfile->buffer;
- cppchar_t c = EOF, prevc = EOF;
+ cppchar_t c;
- pfile->state.lexing_comment = 1;
- while (buffer->cur != buffer->rlimit)
- {
- prevc = c, c = *buffer->cur++;
+ buffer->cur++;
+ if (*buffer->cur == '/')
+ buffer->cur++;
- next_char:
- /* FIXME: For speed, create a new character class of characters
- of interest inside block comments. */
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile, c);
+ for (;;)
+ {
+ c = *buffer->cur++;
/* People like decorating comments with '*', so check for '/'
instead for efficiency. */
if (c == '/')
{
- if (prevc == '*')
+ if (buffer->cur[-2] == '*')
break;
/* Warn about potential nested comments, but not if the '/'
- comes immediately before the true comment delimeter.
+ comes immediately before the true comment delimiter.
Don't bother to get it right across escaped newlines. */
if (CPP_OPTION (pfile, warn_comments)
- && buffer->cur != buffer->rlimit)
- {
- prevc = c, c = *buffer->cur++;
- if (c == '*' && buffer->cur != buffer->rlimit)
- {
- prevc = c, c = *buffer->cur++;
- if (c != '/')
- cpp_warning_with_line (pfile, pfile->line,
- CPP_BUF_COL (buffer) - 2,
- "\"/*\" within comment");
- }
- goto next_char;
- }
+ && buffer->cur[0] == '*' && buffer->cur[1] != '/')
+ cpp_error_with_line (pfile, DL_WARNING,
+ pfile->line, CPP_BUF_COL (buffer),
+ "\"/*\" within comment");
}
- else if (is_vspace (c))
+ else if (c == '\n')
{
- prevc = c, c = handle_newline (pfile, c);
- goto next_char;
+ buffer->cur--;
+ _cpp_process_line_notes (pfile, true);
+ if (buffer->next_line >= buffer->rlimit)
+ return true;
+ _cpp_clean_line (pfile);
+ pfile->line++;
}
- else if (c == '\t')
- adjust_column (pfile);
}
- pfile->state.lexing_comment = 0;
- buffer->read_ahead = EOF;
- return c != '/' || prevc != '*';
+ _cpp_process_line_notes (pfile, true);
+ return false;
}
-/* Skip a C++ line comment. Handles escaped newlines. Returns
- non-zero if a multiline comment. The following new line, if any,
- is left in buffer->read_ahead. */
+/* Skip a C++ line comment, leaving buffer->cur pointing to the
+ terminating newline. Handles escaped newlines. Returns nonzero
+ if a multiline comment. */
static int
-skip_line_comment (pfile)
- cpp_reader *pfile;
+skip_line_comment (cpp_reader *pfile)
{
cpp_buffer *buffer = pfile->buffer;
unsigned int orig_line = pfile->line;
- cppchar_t c;
- pfile->state.lexing_comment = 1;
- do
- {
- c = EOF;
- if (buffer->cur == buffer->rlimit)
- break;
-
- c = *buffer->cur++;
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile, c);
- }
- while (!is_vspace (c));
+ while (*buffer->cur != '\n')
+ buffer->cur++;
- pfile->state.lexing_comment = 0;
- buffer->read_ahead = c; /* Leave any newline for caller. */
+ _cpp_process_line_notes (pfile, true);
return orig_line != pfile->line;
}
-/* pfile->buffer->cur is one beyond the \t character. Update
- col_adjust so we track the column correctly. */
+/* Skips whitespace, saving the next non-whitespace character. */
static void
-adjust_column (pfile)
- cpp_reader *pfile;
+skip_whitespace (cpp_reader *pfile, cppchar_t c)
{
cpp_buffer *buffer = pfile->buffer;
- unsigned int col = CPP_BUF_COL (buffer) - 1; /* Zero-based column. */
-
- /* Round it up to multiple of the tabstop, but subtract 1 since the
- tab itself occupies a character position. */
- buffer->col_adjust += (CPP_OPTION (pfile, tabstop)
- - col % CPP_OPTION (pfile, tabstop)) - 1;
-}
-
-/* Skips whitespace, saving the next non-whitespace character.
- Adjusts pfile->col_adjust to account for tabs. Without this,
- tokens might be assigned an incorrect column. */
-static void
-skip_whitespace (pfile, c)
- cpp_reader *pfile;
- cppchar_t c;
-{
- cpp_buffer *buffer = pfile->buffer;
- unsigned int warned = 0;
+ bool saw_NUL = false;
do
{
/* Horizontal space always OK. */
- if (c == ' ')
+ if (c == ' ' || c == '\t')
;
- else if (c == '\t')
- adjust_column (pfile);
/* Just \f \v or \0 left. */
else if (c == '\0')
- {
- if (!warned)
- {
- cpp_warning (pfile, "null character(s) ignored");
- warned = 1;
- }
- }
+ saw_NUL = true;
else if (pfile->state.in_directive && CPP_PEDANTIC (pfile))
- cpp_pedwarn_with_line (pfile, pfile->line,
- CPP_BUF_COL (buffer),
- "%s in preprocessing directive",
- c == '\f' ? "form feed" : "vertical tab");
+ cpp_error_with_line (pfile, DL_PEDWARN, pfile->line,
+ CPP_BUF_COL (buffer),
+ "%s in preprocessing directive",
+ c == '\f' ? "form feed" : "vertical tab");
- c = EOF;
- if (buffer->cur == buffer->rlimit)
- break;
c = *buffer->cur++;
}
/* We only want non-vertical space, i.e. ' ' \t \f \v \0. */
while (is_nvspace (c));
- /* Remember the next character. */
- buffer->read_ahead = c;
+ if (saw_NUL)
+ cpp_error (pfile, DL_WARNING, "null character(s) ignored");
+
+ buffer->cur--;
}
/* See if the characters of a number token are valid in a name (no
'.', '+' or '-'). */
static int
-name_p (pfile, string)
- cpp_reader *pfile;
- const cpp_string *string;
+name_p (cpp_reader *pfile, const cpp_string *string)
{
unsigned int i;
if (!is_idchar (string->text[i]))
return 0;
- return 1;
+ return 1;
}
-/* Parse an identifier, skipping embedded backslash-newlines. This is
- a critical inner loop. The common case is an identifier which has
- not been split by backslash-newline, does not contain a dollar
- sign, and has already been scanned (roughly 10:1 ratio of
- seen:unseen identifiers in normal code; the distribution is
- Poisson-like). Second most common case is a new identifier, not
- split and no dollar sign. The other possibilities are rare and
- have been relegated to parse_identifier_slow. */
+/* Returns TRUE if the sequence starting at buffer->cur is invalid in
+ an identifier. FIRST is TRUE if this starts an identifier. */
+static bool
+forms_identifier_p (cpp_reader *pfile, int first)
+{
+ cpp_buffer *buffer = pfile->buffer;
+
+ if (*buffer->cur == '$')
+ {
+ if (!CPP_OPTION (pfile, dollars_in_ident))
+ return false;
+
+ buffer->cur++;
+ if (CPP_OPTION (pfile, warn_dollars) && !pfile->state.skipping)
+ {
+ CPP_OPTION (pfile, warn_dollars) = 0;
+ cpp_error (pfile, DL_PEDWARN, "'$' in identifier or number");
+ }
+
+ 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, buffer->rlimit, 1 + !first))
+ return true;
+ buffer->cur -= 2;
+ }
+
+ return false;
+}
+/* Lex an identifier starting at BUFFER->CUR - 1. */
static cpp_hashnode *
-parse_identifier (pfile)
- cpp_reader *pfile;
+lex_identifier (cpp_reader *pfile, const uchar *base)
{
cpp_hashnode *result;
- const U_CHAR *cur, *rlimit;
+ const uchar *cur;
- /* Fast-path loop. Skim over a normal identifier.
- N.B. ISIDNUM does not include $. */
- cur = pfile->buffer->cur - 1;
- rlimit = pfile->buffer->rlimit;
do
- cur++;
- while (cur < rlimit && ISIDNUM (*cur));
-
- /* Check for slow-path cases. */
- if (cur < rlimit && (*cur == '?' || *cur == '\\' || *cur == '$'))
- result = parse_identifier_slow (pfile, cur);
- else
{
- const U_CHAR *base = pfile->buffer->cur - 1;
- result = (cpp_hashnode *)
- ht_lookup (pfile->hash_table, base, cur - base, HT_ALLOC);
+ cur = pfile->buffer->cur;
+
+ /* N.B. ISIDNUM does not include $. */
+ while (ISIDNUM (*cur))
+ cur++;
+
pfile->buffer->cur = cur;
}
+ while (forms_identifier_p (pfile, false));
+
+ result = (cpp_hashnode *)
+ ht_lookup (pfile->hash_table, base, cur - base, HT_ALLOC);
- /* Rarely, identifiers require diagnostics when lexed.
- XXX Has to be forced out of the fast path. */
+ /* Rarely, identifiers require diagnostics when lexed. */
if (__builtin_expect ((result->flags & NODE_DIAGNOSTIC)
&& !pfile->state.skipping, 0))
{
/* It is allowed to poison the same identifier twice. */
if ((result->flags & NODE_POISONED) && !pfile->state.poisoned_ok)
- cpp_error (pfile, "attempt to use poisoned \"%s\"",
+ cpp_error (pfile, DL_ERROR, "attempt to use poisoned \"%s\"",
NODE_NAME (result));
/* Constraint 6.10.3.5: __VA_ARGS__ should only appear in the
replacement list of a variadic macro. */
if (result == pfile->spec_nodes.n__VA_ARGS__
&& !pfile->state.va_args_ok)
- cpp_pedwarn (pfile,
- "__VA_ARGS__ can only appear in the expansion of a C99 variadic macro");
+ cpp_error (pfile, DL_PEDWARN,
+ "__VA_ARGS__ can only appear in the expansion"
+ " of a C99 variadic macro");
}
return result;
}
-/* Slow path. This handles identifiers which have been split, and
- identifiers which contain dollar signs. The part of the identifier
- from PFILE->buffer->cur-1 to CUR has already been scanned. */
-static cpp_hashnode *
-parse_identifier_slow (pfile, cur)
- cpp_reader *pfile;
- const U_CHAR *cur;
-{
- cpp_buffer *buffer = pfile->buffer;
- const U_CHAR *base = buffer->cur - 1;
- struct obstack *stack = &pfile->hash_table->stack;
- unsigned int c, saw_dollar = 0, len;
-
- /* Copy the part of the token which is known to be okay. */
- obstack_grow (stack, base, cur - base);
-
- /* Now process the part which isn't. We are looking at one of
- '$', '\\', or '?' on entry to this loop. */
- c = *cur++;
- buffer->cur = cur;
- do
- {
- while (is_idchar (c))
- {
- obstack_1grow (stack, c);
-
- if (c == '$')
- saw_dollar++;
-
- c = EOF;
- if (buffer->cur == buffer->rlimit)
- break;
-
- c = *buffer->cur++;
- }
-
- /* Potential escaped newline? */
- if (c != '?' && c != '\\')
- break;
- c = skip_escaped_newlines (pfile, c);
- }
- while (is_idchar (c));
-
- /* Remember the next character. */
- buffer->read_ahead = c;
-
- /* $ is not a identifier character in the standard, but is commonly
- accepted as an extension. Don't warn about it in skipped
- conditional blocks. */
- if (saw_dollar && CPP_PEDANTIC (pfile) && ! pfile->state.skipping)
- cpp_pedwarn (pfile, "'$' character(s) in identifier");
-
- /* Identifiers are null-terminated. */
- len = obstack_object_size (stack);
- obstack_1grow (stack, '\0');
-
- return (cpp_hashnode *)
- ht_lookup (pfile->hash_table, obstack_finish (stack), len, HT_ALLOCED);
-}
-
-/* Parse a number, skipping embedded backslash-newlines. */
+/* Lex a number to NUMBER starting at BUFFER->CUR - 1. */
static void
-parse_number (pfile, number, c, leading_period)
- cpp_reader *pfile;
- cpp_string *number;
- cppchar_t c;
- int leading_period;
+lex_number (cpp_reader *pfile, cpp_string *number)
{
- cpp_buffer *buffer = pfile->buffer;
- unsigned char *dest, *limit;
+ const uchar *cur;
+ const uchar *base;
+ uchar *dest;
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
-
- /* Place a leading period. */
- if (leading_period)
- {
- if (dest == limit)
- {
- pfile->u_buff = _cpp_extend_buff (pfile, pfile->u_buff, 1);
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
- }
- *dest++ = '.';
- }
-
+ base = pfile->buffer->cur - 1;
do
{
- do
- {
- /* Need room for terminating null. */
- if ((size_t) (limit - dest) < 2)
- {
- size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff);
- pfile->u_buff = _cpp_extend_buff (pfile, pfile->u_buff, 2);
- dest = BUFF_FRONT (pfile->u_buff) + len_so_far;
- limit = BUFF_LIMIT (pfile->u_buff);
- }
- *dest++ = c;
-
- c = EOF;
- if (buffer->cur == buffer->rlimit)
- break;
+ cur = pfile->buffer->cur;
- c = *buffer->cur++;
- }
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
+ /* N.B. ISIDNUM does not include $. */
+ while (ISIDNUM (*cur) || *cur == '.' || VALID_SIGN (*cur, cur[-1]))
+ cur++;
- /* Potential escaped newline? */
- if (c != '?' && c != '\\')
- break;
- c = skip_escaped_newlines (pfile, c);
+ pfile->buffer->cur = cur;
}
- while (is_numchar (c) || c == '.' || VALID_SIGN (c, dest[-1]));
-
- /* Remember the next character. */
- buffer->read_ahead = c;
-
- /* Null-terminate the number. */
- *dest = '\0';
+ while (forms_identifier_p (pfile, false));
- number->text = BUFF_FRONT (pfile->u_buff);
- number->len = dest - number->text;
- BUFF_FRONT (pfile->u_buff) = dest + 1;
+ number->len = cur - base;
+ dest = _cpp_unaligned_alloc (pfile, number->len + 1);
+ memcpy (dest, base, number->len);
+ dest[number->len] = '\0';
+ number->text = dest;
}
-/* Subroutine of parse_string. Emits error for unterminated strings. */
+/* Create a token of type TYPE with a literal spelling. */
static void
-unterminated (pfile, term)
- cpp_reader *pfile;
- int term;
+create_literal (cpp_reader *pfile, cpp_token *token, const uchar *base,
+ unsigned int len, enum cpp_ttype type)
{
- cpp_error (pfile, "missing terminating %c character", term);
-
- if (term == '\"' && pfile->mls_line && pfile->mls_line != pfile->line)
- {
- cpp_error_with_line (pfile, pfile->mls_line, pfile->mls_col,
- "possible start of unterminated string literal");
- pfile->mls_line = 0;
- }
-}
-
-/* Subroutine of parse_string. */
-static int
-unescaped_terminator_p (pfile, dest)
- cpp_reader *pfile;
- const unsigned char *dest;
-{
- const unsigned char *start, *temp;
-
- /* In #include-style directives, terminators are not escapeable. */
- if (pfile->state.angled_headers)
- return 1;
+ uchar *dest = _cpp_unaligned_alloc (pfile, len + 1);
- start = BUFF_FRONT (pfile->u_buff);
-
- /* An odd number of consecutive backslashes represents an escaped
- terminator. */
- for (temp = dest; temp > start && temp[-1] == '\\'; temp--)
- ;
-
- return ((dest - temp) & 1) == 0;
+ memcpy (dest, base, len);
+ dest[len] = '\0';
+ token->type = type;
+ token->val.str.len = len;
+ token->val.str.text = dest;
}
-/* Parses a string, character constant, or angle-bracketed header file
- name. Handles embedded trigraphs and escaped newlines. The stored
- string is guaranteed NUL-terminated, but it is not guaranteed that
- this is the first NUL since embedded NULs are preserved.
+/* 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.
- Multi-line strings are allowed, but they are deprecated. */
+ The spelling is NUL-terminated, but it is not guaranteed that this
+ is the first NUL since embedded NULs are preserved. */
static void
-parse_string (pfile, token, terminator)
- cpp_reader *pfile;
- cpp_token *token;
- cppchar_t terminator;
+lex_string (cpp_reader *pfile, cpp_token *token, const uchar *base)
{
- cpp_buffer *buffer = pfile->buffer;
- unsigned char *dest, *limit;
- cppchar_t c;
- bool warned_nulls = false, warned_multi = false;
-
- dest = BUFF_FRONT (pfile->u_buff);
- limit = BUFF_LIMIT (pfile->u_buff);
+ 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 (;;)
{
- if (buffer->cur == buffer->rlimit)
- c = EOF;
- else
- c = *buffer->cur++;
+ cppchar_t c = *cur++;
- have_char:
- /* We need space for the terminating NUL. */
- if ((size_t) (limit - dest) < 1)
- {
- size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff);
- pfile->u_buff = _cpp_extend_buff (pfile, pfile->u_buff, 2);
- dest = BUFF_FRONT (pfile->u_buff) + len_so_far;
- limit = BUFF_LIMIT (pfile->u_buff);
- }
-
- if (c == EOF)
- {
- unterminated (pfile, terminator);
- break;
- }
-
- /* Handle trigraphs, escaped newlines etc. */
- if (c == '?' || c == '\\')
- c = skip_escaped_newlines (pfile, c);
-
- if (c == terminator && unescaped_terminator_p (pfile, dest))
+ /* 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')
{
- c = EOF;
+ cur--;
+ type = CPP_OTHER;
break;
}
- else if (is_vspace (c))
- {
- /* In assembly language, silently terminate string and
- character literals at end of line. This is a kludge
- around not knowing where comments are. */
- if (CPP_OPTION (pfile, lang) == CLK_ASM && terminator != '>')
- break;
-
- /* Character constants and header names may not extend over
- multiple lines. In Standard C, neither may strings.
- Unfortunately, we accept multiline strings as an
- extension, except in #include family directives. */
- if (terminator != '"' || pfile->state.angled_headers)
- {
- unterminated (pfile, terminator);
- break;
- }
-
- if (!warned_multi)
- {
- warned_multi = true;
- cpp_pedwarn (pfile, "multi-line string literals are deprecated");
- }
-
- if (pfile->mls_line == 0)
- {
- pfile->mls_line = token->line;
- pfile->mls_col = token->col;
- }
-
- c = handle_newline (pfile, c);
- *dest++ = '\n';
- goto have_char;
- }
- else if (c == '\0' && !warned_nulls)
- {
- warned_nulls = true;
- cpp_warning (pfile, "null character(s) preserved in literal");
- }
-
- *dest++ = c;
+ else if (c == '\0')
+ saw_NUL = true;
}
- /* Remember the next character. */
- buffer->read_ahead = c;
- *dest = '\0';
+ if (saw_NUL && !pfile->state.skipping)
+ cpp_error (pfile, DL_WARNING, "null character(s) preserved in literal");
- token->val.str.text = BUFF_FRONT (pfile->u_buff);
- token->val.str.len = dest - BUFF_FRONT (pfile->u_buff);
- BUFF_FRONT (pfile->u_buff) = dest + 1;
+ 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)
- cpp_reader *pfile;
- cpp_token *token;
- const unsigned char *from;
+save_comment (cpp_reader *pfile, cpp_token *token, const unsigned char *from,
+ cppchar_t type)
{
unsigned char *buffer;
- unsigned int len;
-
+ 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 (pfile->buffer->read_ahead != EOF)
+ if (is_vspace (pfile->buffer->cur[-1]))
len--;
- buffer = _cpp_unaligned_alloc (pfile, len);
-
- token->type = CPP_COMMENT;
- token->val.str.len = len;
- token->val.str.text = buffer;
- buffer[0] = '/';
- memcpy (buffer + 1, from, len - 1);
-}
+ /* 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.
-/* Subroutine of _cpp_lex_direct to handle '%'. A little tricky, since we
- want to avoid stepping back when lexing %:%X. */
-static void
-lex_percent (pfile, result)
- cpp_reader *pfile;
- cpp_token *result;
-{
- cpp_buffer *buffer= pfile->buffer;
- cppchar_t c;
+ 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;
- result->type = CPP_MOD;
- /* Parsing %:%X could leave an extra character. */
- if (buffer->extra_char == EOF)
- c = get_effective_char (pfile);
- else
- {
- c = buffer->read_ahead = buffer->extra_char;
- buffer->extra_char = EOF;
- }
+ buffer = _cpp_unaligned_alloc (pfile, clen);
- if (c == '=')
- ACCEPT_CHAR (CPP_MOD_EQ);
- else if (CPP_OPTION (pfile, digraphs))
- {
- if (c == ':')
- {
- result->flags |= DIGRAPH;
- ACCEPT_CHAR (CPP_HASH);
- if (get_effective_char (pfile) == '%')
- {
- buffer->extra_char = get_effective_char (pfile);
- if (buffer->extra_char == ':')
- {
- buffer->extra_char = EOF;
- ACCEPT_CHAR (CPP_PASTE);
- }
- else
- /* We'll catch the extra_char when we're called back. */
- buffer->read_ahead = '%';
- }
- }
- else if (c == '>')
- {
- result->flags |= DIGRAPH;
- ACCEPT_CHAR (CPP_CLOSE_BRACE);
- }
- }
-}
-
-/* Subroutine of _cpp_lex_direct to handle '.'. This is tricky, since we
- want to avoid stepping back when lexing '...' or '.123'. In the
- latter case we should also set a flag for parse_number. */
-static void
-lex_dot (pfile, result)
- cpp_reader *pfile;
- cpp_token *result;
-{
- cpp_buffer *buffer = pfile->buffer;
- cppchar_t c;
+ token->type = CPP_COMMENT;
+ token->val.str.len = clen;
+ token->val.str.text = buffer;
- /* Parsing ..X could leave an extra character. */
- if (buffer->extra_char == EOF)
- c = get_effective_char (pfile);
- else
- {
- c = buffer->read_ahead = buffer->extra_char;
- buffer->extra_char = EOF;
- }
+ buffer[0] = '/';
+ memcpy (buffer + 1, from, len - 1);
- /* All known character sets have 0...9 contiguous. */
- if (c >= '0' && c <= '9')
- {
- result->type = CPP_NUMBER;
- parse_number (pfile, &result->val.str, c, 1);
- }
- else
+ /* Finish conversion to a C comment, if necessary. */
+ if (pfile->state.in_directive && type == '/')
{
- result->type = CPP_DOT;
- if (c == '.')
- {
- buffer->extra_char = get_effective_char (pfile);
- if (buffer->extra_char == '.')
- {
- buffer->extra_char = EOF;
- ACCEPT_CHAR (CPP_ELLIPSIS);
- }
- else
- /* We'll catch the extra_char when we're called back. */
- buffer->read_ahead = '.';
- }
- else if (c == '*' && CPP_OPTION (pfile, cplusplus))
- ACCEPT_CHAR (CPP_DOT_STAR);
+ buffer[1] = '*';
+ buffer[clen - 2] = '*';
+ buffer[clen - 1] = '/';
}
}
/* Allocate COUNT tokens for RUN. */
void
-_cpp_init_tokenrun (run, count)
- tokenrun *run;
- unsigned int count;
+_cpp_init_tokenrun (tokenrun *run, unsigned int count)
{
run->base = xnewvec (cpp_token, count);
run->limit = run->base + count;
/* Returns the next tokenrun, or creates one if there is none. */
static tokenrun *
-next_tokenrun (run)
- tokenrun *run;
+next_tokenrun (tokenrun *run)
{
if (run->next == NULL)
{
same as the last lexed token, so that diagnostics appear in the
right place. */
cpp_token *
-_cpp_temp_token (pfile)
- cpp_reader *pfile;
+_cpp_temp_token (cpp_reader *pfile)
{
cpp_token *old, *result;
/* Lex a token into RESULT (external interface). Takes care of issues
like directive handling, token lookahead, multiple include
- opimisation and skipping. */
+ optimization and skipping. */
const cpp_token *
-_cpp_lex_token (pfile)
- cpp_reader *pfile;
+_cpp_lex_token (cpp_reader *pfile)
{
cpp_token *result;
/* Is this a directive. If _cpp_handle_directive returns
false, it is an assembler #. */
if (result->type == CPP_HASH
- && !pfile->state.parsing_args
+ /* 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);
+ pfile->cb.line_change (pfile, result, pfile->state.parsing_args);
}
/* We don't skip tokens in directives. */
/* 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. */
+ get here and MI optimization works. */
pfile->mi_valid = false;
if (!pfile->state.skipping || result->type == CPP_EOF)
return result;
}
+/* Returns true if a fresh line has been loaded. */
+bool
+_cpp_get_fresh_line (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->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
+ 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.
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;
+_cpp_lex_direct (cpp_reader *pfile)
{
cppchar_t c;
cpp_buffer *buffer;
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;
- result->flags = buffer->saved_flags;
- buffer->saved_flags = 0;
update_tokens_line:
result->line = pfile->line;
skipped_white:
- c = buffer->read_ahead;
- if (c == EOF && buffer->cur < buffer->rlimit)
- c = *buffer->cur++;
+ 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);
- buffer->read_ahead = EOF;
- trigraph:
switch (c)
{
- case EOF:
- buffer->saved_flags = BOL;
- if (!pfile->state.parsing_args && !pfile->state.in_directive)
- {
- if (buffer->cur != buffer->line_base)
- {
- /* Non-empty files should end in a newline. Don't warn
- for command line and _Pragma buffers. */
- if (!buffer->from_stage3)
- cpp_pedwarn (pfile, "no newline at end of file");
- handle_newline (pfile, '\n');
- }
-
- /* Don't pop the last buffer. */
- if (buffer->prev)
- {
- unsigned char stop = buffer->return_at_eof;
-
- _cpp_pop_buffer (pfile);
- if (!stop)
- goto fresh_line;
- }
- }
- result->type = CPP_EOF;
- break;
-
case ' ': case '\t': case '\f': case '\v': case '\0':
- skip_whitespace (pfile, c);
- result->flags |= PREV_WHITE;
- goto skipped_white;
-
- case '\n': case '\r':
- handle_newline (pfile, c);
- buffer->saved_flags = BOL;
- if (! pfile->state.in_directive)
- {
- if (pfile->state.parsing_args == 2)
- buffer->saved_flags |= PREV_WHITE;
- if (!pfile->keep_tokens)
- {
- pfile->cur_run = &pfile->base_run;
- result = pfile->base_run.base;
- pfile->cur_token = result + 1;
- }
- goto fresh_line;
- }
- result->type = CPP_EOF;
- break;
+ result->flags |= PREV_WHITE;
+ skip_whitespace (pfile, c);
+ goto skipped_white;
- case '?':
- case '\\':
- /* These could start an escaped newline, or '?' a trigraph. Let
- skip_escaped_newlines do all the work. */
- {
- unsigned int line = pfile->line;
-
- c = skip_escaped_newlines (pfile, c);
- if (line != pfile->line)
- /* We had at least one escaped newline of some sort, and the
- next character is in buffer->read_ahead. Update the
- token's line and column. */
- goto update_tokens_line;
-
- /* We are either the original '?' or '\\', or a trigraph. */
- result->type = CPP_QUERY;
- buffer->read_ahead = EOF;
- if (c == '\\')
- goto random_char;
- else if (c != '?')
- goto trigraph;
- }
- break;
+ 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;
- parse_number (pfile, &result->val.str, c, 0);
+ lex_number (pfile, &result->val.str);
break;
- case '$':
- if (!CPP_OPTION (pfile, dollars_in_ident))
- goto random_char;
- /* Fall through... */
+ 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 '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 'L':
+ 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 = parse_identifier (pfile);
+ result->val.node = lex_identifier (pfile, buffer->cur - 1);
- /* 'L' may introduce wide characters or strings. */
- if (result->val.node == pfile->spec_nodes.n_L)
- {
- c = buffer->read_ahead;
- if (c == EOF && buffer->cur < buffer->rlimit)
- c = *buffer->cur;
- if (c == '\'' || c == '"')
- {
- buffer->cur++;
- ACCEPT_CHAR (c == '"' ? CPP_WSTRING: CPP_WCHAR);
- goto make_string;
- }
- }
/* Convert named operators to their proper types. */
- else if (result->val.node->flags & NODE_OPERATOR)
+ if (result->val.node->flags & NODE_OPERATOR)
{
result->flags |= NAMED_OP;
- result->type = result->val.node->value.operator;
+ result->type = result->val.node->directive_index;
}
break;
case '\'':
case '"':
- result->type = c == '"' ? CPP_STRING: CPP_CHAR;
- make_string:
- parse_string (pfile, result, c);
+ lex_string (pfile, result, buffer->cur - 1);
break;
case '/':
/* A potential block or line comment. */
comment_start = buffer->cur;
- result->type = CPP_DIV;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_DIV_EQ);
- if (c != '/' && c != '*')
- break;
+ c = *buffer->cur;
if (c == '*')
{
- if (skip_block_comment (pfile))
- cpp_error (pfile, "unterminated comment");
+ if (_cpp_skip_block_comment (pfile))
+ cpp_error (pfile, DL_ERROR, "unterminated comment");
}
- else
+ else if (c == '/' && (CPP_OPTION (pfile, cplusplus_comments)
+ || CPP_IN_SYSTEM_HEADER (pfile)))
{
- if (!CPP_OPTION (pfile, cplusplus_comments)
- && !CPP_IN_SYSTEM_HEADER (pfile))
- break;
-
/* 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_pedwarn (pfile,
- "C++ style comments are not allowed in ISO C89");
- cpp_pedwarn (pfile,
- "(this will be reported only once per input file)");
+ 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;
}
- /* Skip_line_comment updates buffer->read_ahead. */
if (skip_line_comment (pfile) && CPP_OPTION (pfile, warn_comments))
- cpp_warning (pfile, "multi-line comment");
+ 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;
}
- /* Skipping the comment has updated buffer->read_ahead. */
if (!pfile->state.save_comments)
{
result->flags |= PREV_WHITE;
}
/* Save the comment as a token in its own right. */
- save_comment (pfile, result, comment_start);
+ save_comment (pfile, result, comment_start, c);
break;
case '<':
if (pfile->state.angled_headers)
{
- result->type = CPP_HEADER_NAME;
- c = '>'; /* terminator. */
- goto make_string;
+ lex_string (pfile, result, buffer->cur - 1);
+ break;
}
result->type = CPP_LESS;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_LESS_EQ);
- else if (c == '<')
+ if (*buffer->cur == '=')
+ buffer->cur++, result->type = CPP_LESS_EQ;
+ else if (*buffer->cur == '<')
{
- ACCEPT_CHAR (CPP_LSHIFT);
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_LSHIFT_EQ);
+ buffer->cur++;
+ IF_NEXT_IS ('=', CPP_LSHIFT_EQ, CPP_LSHIFT);
}
- else if (c == '?' && CPP_OPTION (pfile, cplusplus))
+ else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
{
- ACCEPT_CHAR (CPP_MIN);
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_MIN_EQ);
+ buffer->cur++;
+ IF_NEXT_IS ('=', CPP_MIN_EQ, CPP_MIN);
}
- else if (c == ':' && CPP_OPTION (pfile, digraphs))
+ else if (CPP_OPTION (pfile, digraphs))
{
- ACCEPT_CHAR (CPP_OPEN_SQUARE);
- result->flags |= DIGRAPH;
- }
- else if (c == '%' && CPP_OPTION (pfile, digraphs))
- {
- ACCEPT_CHAR (CPP_OPEN_BRACE);
- result->flags |= DIGRAPH;
+ 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;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_GREATER_EQ);
- else if (c == '>')
+ if (*buffer->cur == '=')
+ buffer->cur++, result->type = CPP_GREATER_EQ;
+ else if (*buffer->cur == '>')
{
- ACCEPT_CHAR (CPP_RSHIFT);
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_RSHIFT_EQ);
+ buffer->cur++;
+ IF_NEXT_IS ('=', CPP_RSHIFT_EQ, CPP_RSHIFT);
}
- else if (c == '?' && CPP_OPTION (pfile, cplusplus))
+ else if (*buffer->cur == '?' && CPP_OPTION (pfile, cplusplus))
{
- ACCEPT_CHAR (CPP_MAX);
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_MAX_EQ);
+ buffer->cur++;
+ IF_NEXT_IS ('=', CPP_MAX_EQ, CPP_MAX);
}
break;
case '%':
- lex_percent (pfile, result);
+ 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 '.':
- lex_dot (pfile, result);
+ 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;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_PLUS_EQ);
- else if (c == '+')
- ACCEPT_CHAR (CPP_PLUS_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;
- c = get_effective_char (pfile);
- if (c == '>')
+ if (*buffer->cur == '>')
{
- ACCEPT_CHAR (CPP_DEREF);
- if (CPP_OPTION (pfile, cplusplus)
- && get_effective_char (pfile) == '*')
- ACCEPT_CHAR (CPP_DEREF_STAR);
+ buffer->cur++;
+ result->type = CPP_DEREF;
+ if (*buffer->cur == '*' && CPP_OPTION (pfile, cplusplus))
+ buffer->cur++, result->type = CPP_DEREF_STAR;
}
- else if (c == '=')
- ACCEPT_CHAR (CPP_MINUS_EQ);
- else if (c == '-')
- ACCEPT_CHAR (CPP_MINUS_MINUS);
- break;
-
- case '*':
- result->type = CPP_MULT;
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_MULT_EQ);
- break;
-
- case '=':
- result->type = CPP_EQ;
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_EQ_EQ);
- break;
-
- case '!':
- result->type = CPP_NOT;
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_NOT_EQ);
+ 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;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_AND_EQ);
- else if (c == '&')
- ACCEPT_CHAR (CPP_AND_AND);
- break;
-
- case '#':
- result->type = CPP_HASH;
- if (get_effective_char (pfile) == '#')
- ACCEPT_CHAR (CPP_PASTE);
+ 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;
- c = get_effective_char (pfile);
- if (c == '=')
- ACCEPT_CHAR (CPP_OR_EQ);
- else if (c == '|')
- ACCEPT_CHAR (CPP_OR_OR);
- break;
-
- case '^':
- result->type = CPP_XOR;
- if (get_effective_char (pfile) == '=')
- ACCEPT_CHAR (CPP_XOR_EQ);
+ 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;
- c = get_effective_char (pfile);
- if (c == ':' && CPP_OPTION (pfile, cplusplus))
- ACCEPT_CHAR (CPP_SCOPE);
- else if (c == '>' && CPP_OPTION (pfile, digraphs))
+ 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;
- ACCEPT_CHAR (CPP_CLOSE_SQUARE);
+ 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_BRACE; break;
case ';': result->type = CPP_SEMICOLON; break;
- /* @ is a punctuator in Objective C. */
+ /* @ is a punctuator in Objective-C. */
case '@': result->type = CPP_ATSIGN; break;
- random_char:
+ 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:
- result->type = CPP_OTHER;
- result->val.c = c;
+ create_literal (pfile, result, buffer->cur - 1, 1, CPP_OTHER);
break;
}
return result;
}
-/* An upper bound on the number of bytes needed to spell a token,
- including preceding whitespace. */
+/* 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;
+cpp_token_len (const cpp_token *token)
{
unsigned int len;
switch (TOKEN_SPELL (token))
{
- default: len = 0; break;
- case SPELL_STRING: len = token->val.str.len; break;
+ default: len = 4; break;
+ case SPELL_LITERAL: len = token->val.str.len; break;
case SPELL_IDENT: len = NODE_LEN (token->val.node); break;
}
- /* 1 for whitespace, 4 for comment delimeters. */
- return len + 5;
+
+ 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. */
+ Returns a pointer to the character after the last character written.
+ FIXME: Would be nice if we didn't need the PFILE argument. */
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;
+cpp_spell_token (cpp_reader *pfile, const cpp_token *token,
+ unsigned char *buffer)
{
switch (TOKEN_SPELL (token))
{
goto spell_ident;
else
spelling = TOKEN_NAME (token);
-
+
while ((c = *spelling++) != '\0')
*buffer++ = c;
}
break;
+ spell_ident:
case SPELL_IDENT:
- spell_ident:
memcpy (buffer, NODE_NAME (token->val.node), NODE_LEN (token->val.node));
buffer += NODE_LEN (token->val.node);
break;
- case SPELL_STRING:
- {
- int left, right, tag;
- switch (token->type)
- {
- case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
- case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
- case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
- case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
- case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
- default: left = '\0'; right = '\0'; tag = '\0'; break;
- }
- if (tag) *buffer++ = tag;
- if (left) *buffer++ = left;
- memcpy (buffer, token->val.str.text, token->val.str.len);
- buffer += token->val.str.len;
- if (right) *buffer++ = right;
- }
- break;
-
- case SPELL_CHAR:
- *buffer++ = token->val.c;
+ case SPELL_LITERAL:
+ memcpy (buffer, token->val.str.text, token->val.str.len);
+ buffer += token->val.str.len;
break;
case SPELL_NONE:
- cpp_ice (pfile, "Unspellable token %s", TOKEN_NAME (token));
+ cpp_error (pfile, DL_ICE, "unspellable token %s", TOKEN_NAME (token));
break;
}
return buffer;
}
-/* Returns a token as a null-terminated string. The string is
- temporary, and automatically freed later. Useful for diagnostics. */
+/* 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);
+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);
return start;
}
-/* Used by C front ends. Should really move to using cpp_token_as_text. */
+/* Used by C front ends, which really should move to using
+ cpp_token_as_text. */
const char *
-cpp_type2name (type)
- enum cpp_ttype type;
+cpp_type2name (enum cpp_ttype type)
{
return (const char *) token_spellings[type].name;
}
Separated from cpp_spell_token for efficiency - to avoid stdio
double-buffering. */
void
-cpp_output_token (token, fp)
- const cpp_token *token;
- FILE *fp;
+cpp_output_token (const cpp_token *token, FILE *fp)
{
switch (TOKEN_SPELL (token))
{
fwrite (NODE_NAME (token->val.node), 1, NODE_LEN (token->val.node), fp);
break;
- case SPELL_STRING:
- {
- int left, right, tag;
- switch (token->type)
- {
- case CPP_STRING: left = '"'; right = '"'; tag = '\0'; break;
- case CPP_WSTRING: left = '"'; right = '"'; tag = 'L'; break;
- case CPP_CHAR: left = '\''; right = '\''; tag = '\0'; break;
- case CPP_WCHAR: left = '\''; right = '\''; tag = 'L'; break;
- case CPP_HEADER_NAME: left = '<'; right = '>'; tag = '\0'; break;
- default: left = '\0'; right = '\0'; tag = '\0'; break;
- }
- if (tag) putc (tag, fp);
- if (left) putc (left, fp);
- fwrite (token->val.str.text, 1, token->val.str.len, fp);
- if (right) putc (right, fp);
- }
- break;
-
- case SPELL_CHAR:
- putc (token->val.c, fp);
+ case SPELL_LITERAL:
+ fwrite (token->val.str.text, 1, token->val.str.len, fp);
break;
case SPELL_NONE:
/* Compare two tokens. */
int
-_cpp_equiv_tokens (a, b)
- const cpp_token *a, *b;
+_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:
return 1;
- case SPELL_CHAR:
- return a->val.c == b->val.c; /* Character. */
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_STRING:
+ 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));
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;
+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;
|| b == CPP_CHAR || b == CPP_STRING); /* L */
case CPP_NUMBER: return (b == CPP_NUMBER || b == CPP_NAME
|| c == '.' || c == '+' || c == '-');
- case CPP_OTHER: return (CPP_OPTION (pfile, objc)
- && token1->val.c == '@'
- && (b == CPP_NAME || b == CPP_STRING));
+ /* 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;
}
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;
+cpp_output_line (cpp_reader *pfile, FILE *fp)
{
const cpp_token *token;
putc ('\n', fp);
}
-/* Returns the value of a hexadecimal digit. */
-static unsigned int
-hex_digit_value (c)
- unsigned int c;
-{
- if (c >= 'a' && c <= 'f')
- return c - 'a' + 10;
- if (c >= 'A' && c <= 'F')
- return c - 'A' + 10;
- if (c >= '0' && c <= '9')
- return c - '0';
- abort ();
-}
-
-/* Parse a '\uNNNN' or '\UNNNNNNNN' sequence. Returns 1 to indicate
- failure if cpplib is not parsing C++ or C99. Such failure is
- silent, and no variables are updated. Otherwise returns 0, and
- warns if -Wtraditional.
-
- [lex.charset]: The character designated by the universal character
- name \UNNNNNNNN is that character whose character short name in
- ISO/IEC 10646 is NNNNNNNN; the character designated by the
- universal character name \uNNNN is that character whose character
- short name in ISO/IEC 10646 is 0000NNNN. If the hexadecimal value
- for a universal character name is less than 0x20 or in the range
- 0x7F-0x9F (inclusive), or if the universal character name
- designates a character in the basic source character set, then the
- program is ill-formed.
-
- We assume that wchar_t is Unicode, so we don't need to do any
- mapping. Is this ever wrong?
-
- PC points to the 'u' or 'U', PSTR is points to the byte after PC,
- LIMIT is the end of the string or charconst. PSTR is updated to
- point after the UCS on return, and the UCS is written into PC. */
-
-static int
-maybe_read_ucs (pfile, pstr, limit, pc)
- cpp_reader *pfile;
- const unsigned char **pstr;
- const unsigned char *limit;
- unsigned int *pc;
-{
- const unsigned char *p = *pstr;
- unsigned int code = 0;
- unsigned int c = *pc, length;
-
- /* Only attempt to interpret a UCS for C++ and C99. */
- if (! (CPP_OPTION (pfile, cplusplus) || CPP_OPTION (pfile, c99)))
- return 1;
-
- if (CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "the meaning of '\\%c' varies with -traditional", c);
-
- length = (c == 'u' ? 4: 8);
-
- if ((size_t) (limit - p) < length)
- {
- cpp_error (pfile, "incomplete universal-character-name");
- /* Skip to the end to avoid more diagnostics. */
- p = limit;
- }
- else
- {
- for (; length; length--, p++)
- {
- c = *p;
- if (ISXDIGIT (c))
- code = (code << 4) + hex_digit_value (c);
- else
- {
- cpp_error (pfile,
- "non-hex digit '%c' in universal-character-name", c);
- /* We shouldn't skip in case there are multibyte chars. */
- break;
- }
- }
- }
-
-#ifdef TARGET_EBCDIC
- cpp_error (pfile, "universal-character-name on EBCDIC target");
- code = 0x3f; /* EBCDIC invalid character */
-#else
- /* True extended characters are OK. */
- if (code >= 0xa0
- && !(code & 0x80000000)
- && !(code >= 0xD800 && code <= 0xDFFF))
- ;
- /* The standard permits $, @ and ` to be specified as UCNs. We use
- hex escapes so that this also works with EBCDIC hosts. */
- else if (code == 0x24 || code == 0x40 || code == 0x60)
- ;
- /* Don't give another error if one occurred above. */
- else if (length == 0)
- cpp_error (pfile, "universal-character-name out of range");
-#endif
-
- *pstr = p;
- *pc = code;
- return 0;
-}
-
-/* Interpret an escape sequence, and return its value. PSTR points to
- the input pointer, which is just after the backslash. LIMIT is how
- much text we have. MASK is a bitmask for the precision for the
- destination type (char or wchar_t). TRADITIONAL, if true, does not
- interpret escapes that did not exist in traditional C.
-
- Handles all relevant diagnostics. */
-
-unsigned int
-cpp_parse_escape (pfile, pstr, limit, mask, traditional)
- cpp_reader *pfile;
- const unsigned char **pstr;
- const unsigned char *limit;
- unsigned HOST_WIDE_INT mask;
- int traditional;
-{
- int unknown = 0;
- const unsigned char *str = *pstr;
- unsigned int c = *str++;
-
- switch (c)
- {
- case '\\': case '\'': case '"': case '?': break;
- case 'b': c = TARGET_BS; break;
- case 'f': c = TARGET_FF; break;
- case 'n': c = TARGET_NEWLINE; break;
- case 'r': c = TARGET_CR; break;
- case 't': c = TARGET_TAB; break;
- case 'v': c = TARGET_VT; 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_warning (pfile, "the meaning of '\\a' varies with -traditional");
- if (!traditional)
- c = TARGET_BELL;
- break;
-
- case 'e': case 'E':
- if (CPP_PEDANTIC (pfile))
- cpp_pedwarn (pfile, "non-ISO-standard escape sequence, '\\%c'", c);
- c = TARGET_ESC;
- break;
-
- case 'u': case 'U':
- unknown = maybe_read_ucs (pfile, &str, limit, &c);
- break;
-
- case 'x':
- if (CPP_WTRADITIONAL (pfile))
- cpp_warning (pfile, "the meaning of '\\x' varies with -traditional");
-
- if (!traditional)
- {
- unsigned int 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, "\\x used with no following hex digits");
-
- if (overflow | (i != (i & mask)))
- {
- cpp_pedwarn (pfile, "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':
- {
- unsigned int i = c - '0';
- int count = 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_pedwarn (pfile, "octal escape sequence out of range");
- i &= mask;
- }
- c = i;
- }
- break;
-
- default:
- unknown = 1;
- break;
- }
-
- if (unknown)
- {
- if (ISGRAPH (c))
- cpp_pedwarn (pfile, "unknown escape sequence '\\%c'", c);
- else
- cpp_pedwarn (pfile, "unknown escape sequence: '\\%03o'", c);
- }
-
- if (c > mask)
- cpp_pedwarn (pfile, "escape sequence out of range for character");
-
- *pstr = str;
- return c;
-}
-
-#ifndef MAX_CHAR_TYPE_SIZE
-#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
-#endif
-
-#ifndef MAX_WCHAR_TYPE_SIZE
-#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
-#endif
-
-/* Interpret a (possibly wide) character constant in TOKEN.
- WARN_MULTI warns about multi-character charconsts, if not
- TRADITIONAL. TRADITIONAL also indicates not to interpret escapes
- that did not exist in traditional C. PCHARS_SEEN points to a
- variable that is filled in with the number of characters seen. */
-HOST_WIDE_INT
-cpp_interpret_charconst (pfile, token, warn_multi, traditional, pchars_seen)
- cpp_reader *pfile;
- const cpp_token *token;
- int warn_multi;
- int traditional;
- unsigned int *pchars_seen;
-{
- const unsigned char *str = token->val.str.text;
- const unsigned char *limit = str + token->val.str.len;
- unsigned int chars_seen = 0;
- unsigned int width, max_chars, c;
- unsigned HOST_WIDE_INT mask;
- HOST_WIDE_INT result = 0;
-
-#ifdef MULTIBYTE_CHARS
- (void) local_mbtowc (NULL, NULL, 0);
-#endif
-
- /* Width in bits. */
- if (token->type == CPP_CHAR)
- width = MAX_CHAR_TYPE_SIZE;
- else
- width = MAX_WCHAR_TYPE_SIZE;
-
- if (width < HOST_BITS_PER_WIDE_INT)
- mask = ((unsigned HOST_WIDE_INT) 1 << width) - 1;
- else
- mask = ~0;
- max_chars = HOST_BITS_PER_WIDE_INT / width;
-
- while (str < limit)
- {
-#ifdef MULTIBYTE_CHARS
- wchar_t wc;
- int char_len;
-
- char_len = local_mbtowc (&wc, str, limit - str);
- if (char_len == -1)
- {
- cpp_warning (pfile, "ignoring invalid multibyte character");
- c = *str++;
- }
- else
- {
- str += char_len;
- c = wc;
- }
-#else
- c = *str++;
-#endif
-
- if (c == '\\')
- c = cpp_parse_escape (pfile, &str, limit, mask, traditional);
-
-#ifdef MAP_CHARACTER
- if (ISPRINT (c))
- c = MAP_CHARACTER (c);
-#endif
-
- /* Merge character into result; ignore excess chars. */
- if (++chars_seen <= max_chars)
- {
- if (width < HOST_BITS_PER_WIDE_INT)
- result = (result << width) | (c & mask);
- else
- result = c;
- }
- }
-
- if (chars_seen == 0)
- cpp_error (pfile, "empty character constant");
- else if (chars_seen > max_chars)
- {
- chars_seen = max_chars;
- cpp_warning (pfile, "character constant too long");
- }
- else if (chars_seen > 1 && !traditional && warn_multi)
- cpp_warning (pfile, "multi-character character constant");
-
- /* If char type is signed, sign-extend the constant. The
- __CHAR_UNSIGNED__ macro is set by the driver if appropriate. */
- if (token->type == CPP_CHAR && chars_seen)
- {
- unsigned int nbits = chars_seen * width;
- unsigned int mask = (unsigned int) ~0 >> (HOST_BITS_PER_INT - nbits);
-
- if (pfile->spec_nodes.n__CHAR_UNSIGNED__->type == NT_MACRO
- || ((result >> (nbits - 1)) & 1) == 0)
- result &= mask;
- else
- result |= ~mask;
- }
-
- *pchars_seen = chars_seen;
- 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
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) (8000 + (MIN_SIZE) * 3 / 2)
+#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)
-struct dummy
-{
- char c;
- union
- {
- double d;
- int *p;
- } u;
-};
-
-#define DEFAULT_ALIGNMENT (offsetof (struct dummy, u))
-#define CPP_ALIGN(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
+#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)
- unsigned int len;
+new_buff (size_t len)
{
_cpp_buff *result;
unsigned char *base;
if (len < MIN_BUFF_SIZE)
len = MIN_BUFF_SIZE;
- len = CPP_ALIGN (len, DEFAULT_ALIGNMENT);
+ len = CPP_ALIGN (len);
base = xmalloc (len + sizeof (_cpp_buff));
result = (_cpp_buff *) (base + len);
/* Place a chain of unwanted allocation buffers on the free list. */
void
-_cpp_release_buff (pfile, buff)
- cpp_reader *pfile;
- _cpp_buff *buff;
+_cpp_release_buff (cpp_reader *pfile, _cpp_buff *buff)
{
_cpp_buff *end = buff;
/* Return a free buffer of size at least MIN_SIZE. */
_cpp_buff *
-_cpp_get_buff (pfile, min_size)
- cpp_reader *pfile;
- unsigned int min_size;
+_cpp_get_buff (cpp_reader *pfile, size_t min_size)
{
_cpp_buff *result, **p;
for (p = &pfile->free_buffs;; p = &(*p)->next)
{
- unsigned int size;
+ size_t size;
if (*p == NULL)
return new_buff (min_size);
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))
+ if (size >= min_size && size <= BUFF_SIZE_UPPER_BOUND (min_size))
break;
}
return result;
}
-/* Return a buffer chained on the end of BUFF. Copy to it the
- uncommitted remaining bytes of BUFF, with at least MIN_EXTRA more
- bytes. */
+/* 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_extend_buff (pfile, buff, min_extra)
- cpp_reader *pfile;
- _cpp_buff *buff;
- unsigned int min_extra;
+_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)
{
- unsigned int size = EXTENDED_BUFF_SIZE (buff, min_extra);
+ _cpp_buff *new_buff, *old_buff = *pbuff;
+ size_t size = EXTENDED_BUFF_SIZE (old_buff, min_extra);
- buff->next = _cpp_get_buff (pfile, size);
- memcpy (buff->next->base, buff->cur, buff->limit - buff->cur);
- return buff->next;
+ 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_free_buff (_cpp_buff *buff)
{
_cpp_buff *next;
/* Allocate permanent, unaligned storage of length LEN. */
unsigned char *
-_cpp_unaligned_alloc (pfile, len)
- cpp_reader *pfile;
- size_t len;
+_cpp_unaligned_alloc (cpp_reader *pfile, size_t len)
{
_cpp_buff *buff = pfile->u_buff;
unsigned char *result = buff->cur;
return result;
}
-static int
-chunk_suitable (chunk, size)
- cpp_chunk *chunk;
- unsigned int size;
-{
- /* Being at least twice SIZE means we can use memcpy in
- _cpp_next_chunk rather than memmove. Besides, it's a good idea
- anyway. */
- return (chunk && (unsigned int) (chunk->limit - chunk->base) >= size * 2);
-}
+/* 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.
-/* Returns the end of the new pool. PTR points to a char in the old
- pool, and is updated to point to the same char in the new pool. */
+ All existing other uses clearly fit this restriction: storing
+ registered pragmas during initialization. */
unsigned char *
-_cpp_next_chunk (pool, len, ptr)
- cpp_pool *pool;
- unsigned int len;
- unsigned char **ptr;
-{
- cpp_chunk *chunk = pool->cur->next;
-
- /* LEN is the minimum size we want in the new pool. */
- len += POOL_ROOM (pool);
- if (! chunk_suitable (chunk, len))
- {
- chunk = new_chunk (POOL_SIZE (pool) * 2 + len);
-
- chunk->next = pool->cur->next;
- pool->cur->next = chunk;
- }
-
- /* Update the pointer before changing chunk's front. */
- if (ptr)
- *ptr += chunk->base - POOL_FRONT (pool);
-
- memcpy (chunk->base, POOL_FRONT (pool), POOL_ROOM (pool));
- chunk->front = chunk->base;
-
- pool->cur = chunk;
- return POOL_LIMIT (pool);
-}
-
-static cpp_chunk *
-new_chunk (size)
- unsigned int size;
-{
- unsigned char *base;
- cpp_chunk *result;
-
- size = POOL_ALIGN (size, DEFAULT_ALIGNMENT);
- base = (unsigned char *) xmalloc (size + sizeof (cpp_chunk));
- /* Put the chunk descriptor at the end. Then chunk overruns will
- cause obvious chaos. */
- result = (cpp_chunk *) (base + size);
- result->base = base;
- result->front = base;
- result->limit = base + size;
- result->next = 0;
-
- return result;
-}
-
-void
-_cpp_init_pool (pool, size, align, temp)
- cpp_pool *pool;
- unsigned int size, align, temp;
-{
- if (align == 0)
- align = DEFAULT_ALIGNMENT;
- if (align & (align - 1))
- abort ();
- pool->align = align;
- pool->first = new_chunk (size);
- pool->cur = pool->first;
- if (temp)
- pool->cur->next = pool->cur;
-}
-
-void
-_cpp_free_pool (pool)
- cpp_pool *pool;
+_cpp_aligned_alloc (cpp_reader *pfile, size_t len)
{
- cpp_chunk *chunk = pool->first, *next;
+ _cpp_buff *buff = pfile->a_buff;
+ unsigned char *result = buff->cur;
- do
+ if (len > (size_t) (buff->limit - result))
{
- next = chunk->next;
- free (chunk->base);
- chunk = next;
+ buff = _cpp_get_buff (pfile, len);
+ buff->next = pfile->a_buff;
+ pfile->a_buff = buff;
+ result = buff->cur;
}
- while (chunk && chunk != pool->first);
-}
-
-/* Reserve LEN bytes from a memory pool. */
-unsigned char *
-_cpp_pool_reserve (pool, len)
- cpp_pool *pool;
- unsigned int len;
-{
- len = POOL_ALIGN (len, pool->align);
- if (len > (unsigned int) POOL_ROOM (pool))
- _cpp_next_chunk (pool, len, 0);
-
- return POOL_FRONT (pool);
-}
-/* Allocate LEN bytes from a memory pool. */
-unsigned char *
-_cpp_pool_alloc (pool, len)
- cpp_pool *pool;
- unsigned int len;
-{
- unsigned char *result = _cpp_pool_reserve (pool, len);
-
- POOL_COMMIT (pool, len);
+ buff->cur = result + len;
return result;
}
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